Signal Transmission Method and Apparatus

Abstract

Signal transmission method and apparatus. The method includes: a transmitting device generates a sequence of demodulation reference signals, and maps the sequence of demodulation reference signals to time-frequency resources of the demodulation reference signals for transmission. The demodulation reference signals are used to estimate a channel state of a first channel, and the first channel is used to carry uplink data. The time-frequency resources include frequency-domain resources corresponding to a first CDM group, and the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; a first PRB in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers, the first group of subcarriers and the second group of subcarriers each include 2 subcarriers, the first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on August 14, 2020, with the application number 202010821303.5 and the invention title "Signal Transmission Method and Apparatus", the entire content of which is incorporated herein by reference. Technical Field

[0003] This application relates to the field of mobile communication technologies, and in particular, to signal transmission methods and apparatuses. Background Art

[0004] In fourth generation (4G) and fifth generation (5G) wireless communication systems - new radio access technology (NR) systems, demodulation reference signals (DMRS) are defined for channel estimation and then physical uplink shared channel (PUSCH) data demodulation.

[0005] The generation method of the DMRS sequence is related to the waveform configuration adopted. In the NR system, two waveforms are supported, namely cyclic prefixed orthogonal frequency division multiplexing (CP-OFDM) and discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveforms.

[0006] In the current NR protocol, the DFT-S-OFDM waveform can support a maximum of 8 orthogonal DMRS ports, that is, it can support 8-layer multi-user orthogonal pairing, and the CP-OFDM waveform can support a maximum of 12 orthogonal DMRS ports, that is, it can support 12-layer multi-user orthogonal pairing. If the number of paired layers exceeds the maximum number of multi-user orthogonal pairing layers supported by the corresponding waveform (for example, when using the DFT-S-OFDM waveform, the number of paired layers exceeds 8 layers, or when using the CP-OFDM waveform, the number of paired layers exceeds 12 layers), it will cause the DMRS ports to be non-orthogonal, thereby introducing pilot interference, making the channel estimation of the DMRS inaccurate, and affecting the demodulation performance of the PUSCH.

[0007] With the development of mobile communication and the emergence of new services, the demand for uplink capacity is increasing. For example, in some video surveillance scenarios, it is required that the terminal device upload high-definition videos to the base station, and the number of transmission layers needs to be higher than the maximum number of multi-user orthogonal pairing layers supported by the current system to improve the transmission capacity and meet the future high-capacity requirements. Summary of the Invention

[0008] Embodiments of the present application provide a signal transmission method and apparatus to improve the transmission capacity.

[0009] In a first aspect, a signal transmission method is provided, including:

[0010] The transmitting device generates a sequence of demodulation reference signals for estimating the channel state of a first channel.

[0011] The transmitting device maps the sequence of demodulation reference signals to the time-frequency resources of the demodulation reference signals and transmits them. The time-frequency resources include frequency-domain resources corresponding to a first code division multiplexing (CDM) group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals. The first physical resource block (PRB) in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers. The first group of subcarriers and the second group of subcarriers each include 2 subcarriers. The first group of subcarriers corresponds to a first group of orthogonal cover codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0012] In the above embodiments of the present application, the subcarriers on the first PRB within the frequency-domain resources corresponding to the first CDM group are divided into a first group of subcarriers and a second group of subcarriers, and the first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal. Since different demodulation reference signal ports within the first CDM group are guaranteed to be orthogonal through OCCs, by expanding the OCCs through the above embodiments of the present application, the number of mutually orthogonal demodulation reference signal ports within the first CDM group can be increased without additional time-frequency resource overhead of the demodulation reference signals, and thus the system transmission capacity can be improved.

[0013] In a possible design, the first PRB further includes a third group of subcarriers, the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCCs.

[0014] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC, where the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group of OCC and a second group of OCC.

[0015] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding the frequency domain OCC in the configuration information table into a first group of OCC and a second group of OCC that are orthogonal to each other. In this way, when querying the time domain OCC and the frequency domain OCC according to the configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resources, it can be ensured that the first group of subcarriers on the first PRB in the frequency domain resources corresponding to the first CDM group use the first group of OCC, and the second group of subcarriers use the second group of OCC, so as to ensure the orthogonality of the demodulation reference signal mapped to the first group of subcarriers and the demodulation reference signal mapped to the second group of subcarriers.

[0016] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

[0017] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC, and the OCC includes a frequency domain OCC and a time domain OCC;

[0018] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC, the OCC includes a frequency domain OCC and a time domain OCC, the frequency domain OCC includes a first group of OCC and a second group of OCC, and the demodulation reference signal port indexes included in the second configuration information table and the first configuration information table are different.

[0019] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding it into a first configuration information table and a second configuration information table, and expanding the frequency domain OCC in the second configuration information table into a first group of OCC and a second group of OCC that are orthogonal to each other. In this way, when querying the time domain OCC and the frequency domain OCC according to the first configuration information table and the second configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resources, it is possible to query the corresponding configuration information table according to different demodulation reference signal port indexes, so that the first group of subcarriers on the first PRB in the frequency domain resources corresponding to the first CDM group use the first group of OCC, and the second group of subcarriers use the second group of OCC, so as to ensure the orthogonality of the demodulation reference signal mapped to the first group of subcarriers and the demodulation reference signal mapped to the second group of subcarriers.

[0020] In a possible design, it further includes: the sending device obtains a first set of OCC corresponding to the first set of subcarriers and a second set of OCC corresponding to the second set of subcarriers according to the configuration information table.

[0021] In a possible design, when the sending device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal, it includes:

[0022] The sending device obtains the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0023] Obtain the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE(k, l) Satisfies:

[0024]

[0025] k = 4n + 2k' + Δ

[0026] k' = 0, 1

[0027] t = mod(n, 2)

[0028]

[0029] n = 0, 1, …

[0030] j = 0, 1, …, v - 1

[0031] Where, W f (k' + 2t) is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where, is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, v is the number of transmission layers; where, when t = 0, the frequency-domain OCC is the first set of OCC; when t = 1, the frequency-domain OCC is the second set of OCC.

[0032] In the above embodiments of the present application, through the above mapping formula of the demodulation reference signal, it can cooperate with the extended configuration information table of the demodulation reference signal in the above embodiments to realize the mapping of the demodulation reference signal to the time-frequency resource, and can ensure the orthogonality of each demodulation reference signal port within the first CDM group.

[0033] In a possible design, it further includes: the sending device sends the indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0034] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0035] The above embodiments of the present application can increase the number of demodulation reference signal ports that can be included in the first CDM group to at least 4N. For example, when applying the above embodiments of the present application to DMRS with a configuration type of Type 1 DMRS, without increasing the DMRS overhead, one CDM group can support 8 DMRS ports to be orthogonal, and two CDM groups can support 16 DMRS ports to be orthogonal, realizing 16-layer orthogonal multi-user pairing and effectively improving the system capacity.

[0036] In a second aspect, a signal transmission method is provided, including:

[0037] The sending device generates a sequence of demodulation reference signals, and the demodulation reference signals are used to estimate the channel state of the first channel;

[0038] The sending device maps the sequence of demodulation reference signals to the time-frequency resources of the demodulation reference signals and sends them; the time-frequency resources include the frequency-domain resources corresponding to the first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time-domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0039] In the above embodiments of the present application, the time-domain resources corresponding to the first CDM group are divided into a first group of symbols and a second group of symbols, and the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal. Since different demodulation reference signal ports within the first CDM group are guaranteed to be orthogonal through OCCs, by expanding the OCCs through the above embodiments of the present application, the number of mutually orthogonal demodulation reference signal ports within the first CDM group can be increased without additional time-frequency resource overhead of the demodulation reference signals, and thus the system transmission capacity can be improved.

[0040] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency domain OCC and a time domain OCC. The time domain OCC includes a first group of OCC and a second group of OCC. The first group of OCC corresponds to the first demodulation reference signal type, the second group of OCC corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0041] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding the time domain OCC in the configuration information table into a first group of OCC and a second group of OCC that are orthogonal to each other. In this way, when querying the time domain OCC and the frequency domain OCC according to the configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resources, it can be ensured that the first group of symbols in the time domain resources corresponding to the first CDM group use the first group of OCC, and the second group of symbols use the second group of OCC, so as to ensure the orthogonality of the demodulation reference signal mapped to the first group of symbols and the demodulation reference signal mapped to the second group of symbols.

[0042] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to the first demodulation reference signal type, the second configuration information table corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0043] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCC;

[0044] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCC.

[0045] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding it into a first configuration information table and a second configuration information table, the first configuration information table and the second configuration information table correspond to different demodulation reference signal types (different demodulation reference signal types are associated with different symbol groups), the time-domain OCC in the first configuration information table is the first group of OCC, and the time-domain OCC in the second configuration information table is the second group of OCC. In this way, when querying the time-domain OCC and the frequency-domain OCC according to the first configuration information table and the second configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resources, different configuration information tables can be queried according to different demodulation reference signal types. Specifically, querying the first configuration information table according to the first demodulation reference signal type to obtain the first group of OCC for the first group of symbols, and querying the second configuration information table according to the first demodulation reference signal type to obtain the second group of OCC for the second group of symbols, so as to ensure the orthogonality of the demodulation reference signal mapped to the first group of symbols and the demodulation reference signal mapped to the second group of symbols.

[0046] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC. Among them, the OCC includes the frequency-domain OCC and the time-domain OCC. The frequency-domain OCC includes the first group of OCC and the second group of OCC. The first group of OCC corresponds to the first demodulation reference signal type, the second group of OCC corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0047] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding the frequency-domain OCC in the configuration information table into the mutually orthogonal first group of OCC and the second group of OCC. In this way, when querying the time-domain OCC and the frequency-domain OCC according to the configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resources, the first group of symbols in the time-domain resources corresponding to the first CDM group can use the first group of OCC, and the second group of symbols can use the second group of OCC, so as to ensure the orthogonality of the demodulation reference signal mapped to the first group of symbols and the demodulation reference signal mapped to the second group of symbols.

[0048] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to the first demodulation reference signal type, the second configuration information table corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0049] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC. The OCC includes a frequency-domain OCC and a time-domain OCC, and the frequency-domain OCC is the first group of OCCs;

[0050] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC. The OCC includes a frequency-domain OCC and a time-domain OCC, and the frequency-domain OCC is the second group of OCCs.

[0051] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding it into a first configuration information table and a second configuration information table, the first configuration information table and the second configuration information table correspond to different demodulation reference signal types (different demodulation reference signal types are associated with different symbol groups). The frequency-domain OCC in the first configuration information table is the first group of OCCs, and the frequency-domain OCC in the second configuration information table is the second group of OCCs. In this way, when querying the time-domain OCC and the frequency-domain OCC according to the first configuration information table and the second configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resource, different configuration information tables can be queried according to different demodulation reference signal types. Specifically, query the first configuration information table according to the first demodulation reference signal type to obtain the first group of OCCs for the first group of symbols, and query the second configuration information table according to the first demodulation reference signal type to obtain the second group of OCCs for the second group of symbols, so as to ensure the orthogonality of the demodulation reference signal mapped to the first group of symbols and the demodulation reference signal mapped to the second group of symbols.

[0052] In a possible design, it further includes: the sending device obtains the first group of OCCs corresponding to the first group of symbols and the second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

[0053] In a possible design, when the sending device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal, it includes:

[0054] The sending device obtains the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0055] According to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC, obtain the data of the demodulation reference signal sequence mapped on the first RE(k, l) The data mapped on the first RE(k, l) Satisfies:

[0056]

[0057] k = 4n + 2k' + Δ

[0058] k' = 0, 1

[0059] s = 0, 1

[0060]

[0061] n = 0, 1, …

[0062] j = 0, 1, …, v - 1

[0063] Wherein, W f (k') is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the frequency-domain offset of the CDM group; wherein, is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; wherein, when s = 0, the time-domain OCC is the first group of OCC; when s = 1, the time-domain OCC is the second group of OCC.

[0064] In the above embodiments of the present application, through the mapping formula of the above demodulation reference signal, it is possible to cooperate with the extended demodulation reference signal configuration information table in the above embodiments to realize the mapping of the demodulation reference signal to the time-frequency resource, and ensure the orthogonality of each demodulation reference signal port within the first CDM group.

[0065] In a possible design, the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal, including:

[0066] The transmitting device obtains the frequency-domain offset of the CDM group, the frequency-domain OCC, and the time-domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0067] Obtain the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the frequency-domain offset of the CDM group, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE(k, l) Satisfies:

[0068]

[0069] k = 4n + 2k' + Δ

[0070] k' = 0, 1

[0071] s = 0, 1

[0072]

[0073] n = 0, 1, …

[0074] j = 0, 1, …, v - 1

[0075] Wherein, W f (k′) is the frequency - domain OCC, W t (l′) is the time - domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the frequency - domain offset of the CDM group; wherein, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; wherein, when s = 0, the frequency - domain OCC is the first group of OCC; when s = 1, the frequency - domain OCC is the second group of OCC.

[0076] In the above - mentioned embodiments of the present application, through the mapping formula of the above - mentioned demodulation reference signal, it can cooperate with the expanded demodulation reference signal configuration information table in the above - mentioned embodiments to realize the mapping of the demodulation reference signal to time - frequency resources, and can ensure the orthogonality of each demodulation reference signal port within the first CDM group.

[0077] In a possible design, it further includes: the transmitting device sends the port index indication information of the demodulation reference signal to the terminal.

[0078] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols included in the first group of symbols or the second group of symbols, and the number of symbols included in the first group of symbols and the second group of symbols is the same.

[0079] The above - mentioned embodiments of the present application can increase the number of demodulation reference signal ports that can be included in the first CDM group to at least 4N. For example, when applying the above - mentioned embodiments of the present application to the DMRS with the configuration type of Type 1 DMRS, without increasing the DMRS overhead, one CDM group can support the orthogonality of 8 DMRS ports, and 2 CDM groups can support the orthogonality of 16 DMRS ports in total, realizing the orthogonal multi - user pairing of 16 layers and effectively improving the system capacity.

[0080] In a third aspect, a signal transmission method is provided, including:

[0081] The transmitting device generates a sequence of the demodulation reference signal, and the demodulation reference signal is used to estimate the channel state of the first channel;

[0082] The transmitting device maps the sequence of the demodulation reference signals to time-frequency resources of the demodulation reference signals and transmits them;

[0083] Where:

[0084] The time-frequency resources include frequency-domain resources corresponding to a first port and a second port of the demodulation reference signals in a first CDM group. The frequency-domain resources corresponding to the first port are the same as those corresponding to the second port. The frequency-domain resources corresponding to the first port and those corresponding to the second port are discontinuous and arranged at equal intervals. A first PRB in the frequency-domain resources corresponding to the first port and those corresponding to the second port includes at least two subcarrier groups. Each of the at least two subcarrier groups includes two subcarriers. The at least two subcarrier groups include a first subcarrier group and a second subcarrier group or include a first subcarrier group, a second subcarrier group, and a third subcarrier group;

[0085] The OCC codes used on the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the first port form a first OCC code sequence. The OCC codes used on the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the second port form a second OCC code sequence. The OCC codes used on the REs corresponding to two subcarriers in the first subcarrier group for the frequency-domain resources corresponding to the first port or the second port form a third OCC code sequence, and the OCC codes used on the REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by performing a cyclic shift on the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0086] In the above embodiments of the present application, the OCCs used on the REs corresponding to the above subcarrier groups for the frequency-domain resources corresponding to the first port of the demodulation reference signals in the first CDM group form a first OCC code sequence. The OCCs used on the REs corresponding to the above subcarrier groups for the frequency-domain resources corresponding to the second port of the demodulation reference signals in the first CDM group form a second OCC code sequence. The second OCC code sequence is obtained by performing a cyclic shift on the first OCC code sequence, so that orthogonal OCCs can be obtained by performing a cyclic shift on the OCCs of some demodulation reference signal ports, and the OCC code sequence obtained by this cyclic shift is used for other demodulation reference signal ports. Since different demodulation reference signal ports within the first CDM group are guaranteed to be mutually orthogonal through OCCs, by expanding the OCCs through the above embodiments of the present application, the number of mutually orthogonal demodulation reference signal ports within the first CDM group can be increased without additional time-frequency resource overhead of the demodulation reference signals, and thus the system transmission capacity can be improved.

[0087] In a possible design, the configuration information table of the demodulation reference signal includes the corresponding relationships of the demodulation reference signal port index, the CDM group frequency-domain offset, the OCC, and the cyclic shift factor, where the OCC includes the frequency-domain OCC and the time-domain OCC.

[0088] In the above embodiments of the present application, by expanding the configuration information table of the demodulation reference signal, that is, introducing the cyclic shift factor into the configuration information table, when querying the time-domain OCC and the frequency-domain OCC according to the configuration information table to map the demodulation reference signal sequence to the corresponding time-frequency resources, the OCC corresponding to the demodulation reference signal port index can be cyclically shifted according to the cyclic shift factor corresponding to the demodulation reference signal port index to obtain orthogonal OCC, so as to ensure the orthogonality between the demodulation reference signal ports within the first CDM group.

[0089] In a possible design, it further includes: the transmitting device obtains the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and cyclically shifts the obtained frequency-domain OCC and time-domain OCC according to the obtained cyclic shift factor.

[0090] In a possible design, when the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal, it includes:

[0091] The transmitting device obtains the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor corresponding to the first RE(k,l) according to the configuration information table, where the subcarrier index of the first RE(k,l) in the time-frequency resources is k and the symbol index is l;

[0092] Obtain the data of the demodulation reference signal sequence mapped on the first RE(k,l) according to the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor The data mapped on the first RE(k,l) Satisfies:

[0093]

[0094] k = 4n + 2k' + Δ

[0095] k' = 0, 1

[0096]

[0097] n = 0, 1,...

[0098] j = 0, 1,..., v - 1

[0099] Alternatively, the data mapped on the first RE (k, l) satisfies:

[0100]

[0101] k = 4n + 2k' + Δ

[0102] k' = 0, 1

[0103]

[0104] n = 0, 1, …

[0105] j = 0, 1, …, v - 1

[0106] where W f (k') is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the frequency-domain offset of the CDM group; where is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, v is the number of transmission layers, φ is the cyclic shift factor, and M is a positive integer greater than or equal to 1.

[0107] In the above embodiments of the present application, through the above mapping formula of the demodulation reference signal, it is possible to cooperate with the expanded demodulation reference signal configuration information table in the above embodiments to realize the mapping of the demodulation reference signal to time-frequency resources, and to ensure the orthogonality of each demodulation reference signal port within the first CDM group.

[0108] In a possible design, it further includes: the transmitting device sends the indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0109] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0110] The above embodiments of the present application can increase the number of demodulation reference signal ports that can be included in the first CDM group to at least 4N. For example, when the above embodiments of the present application are applied to DMRS with a configuration type of Type 1 DMRS, without increasing the DMRS overhead, one CDM group can support 8 DMRS ports to be orthogonal, and 2 CDM groups can support 16 DMRS ports to be orthogonal, realizing multi-user pairing with 16-layer orthogonality and effectively improving the system capacity. For another example, when the above embodiments of the present application are applied to DMRS with a configuration type of Type 1 DMRS, without increasing the DMRS overhead, one CDM group can support 12 DMRS ports to be orthogonal, and 2 CDM groups can support 24 DMRS ports to be orthogonal, realizing multi-user pairing with 24-layer orthogonality and effectively improving the system capacity.

[0111] Fourthly, a signal transmission method is provided, including:

[0112] The receiving device receives the demodulation reference signal sent by the transmitting device on the time-frequency resources of the demodulation reference signal, and the demodulation reference signal is used to estimate the channel state of the first channel; the time-frequency resources include the frequency-domain resources corresponding to the first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the first PRB in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers each include 2 subcarriers, the first group of subcarriers corresponds to the first group of OCCs, the second group of subcarriers corresponds to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

[0113] The receiving device obtains the sequence of the demodulation reference signal.

[0114] In a possible design, the first PRB further includes a third group of subcarriers, the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCCs.

[0115] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes the frequency-domain OCC and the time-domain OCC, and the frequency-domain OCC includes the first group of OCCs and the second group of OCCs.

[0116] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

[0117] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, and the OCC includes the frequency-domain OCC and the time-domain OCC;

[0118] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC. The frequency domain OCC includes a first group of OCC and a second group of OCC. The demodulation reference signal port indexes included in the second configuration information table and the first configuration information table are different.

[0119] In a possible design, it further includes: The receiving device obtains a first group of OCC corresponding to the first group of subcarriers and a second group of OCC corresponding to the second group of subcarriers according to the configuration information table.

[0120] In a possible design, the receiving device obtaining the sequence of the demodulation reference signal includes:

[0121] The receiving device obtains the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0122] Obtain the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC The data mapped on the first RE(k, l) Satisfies:

[0123]

[0124] k = 4n + 2k′ + Δ

[0125] k′ = 0, 1

[0126] t = mod(n, 2)

[0127]

[0128] n = 0, 1, …

[0129] j = 0, 1, …, v - 1

[0130] Where, W f (k′ + 2t) is the frequency domain OCC, W t (l′) is the time domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset; where, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; where when t = 0, the frequency-domain OCC is the first group of OCC; when t = 1, the frequency-domain OCC is the second group of OCC.

[0131] In a possible design, it further includes: the receiving device receives the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0132] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0133] In a fifth aspect, a signal transmission method is provided, including:

[0134] The receiving device receives the demodulation reference signal sent by the sending device on the time-frequency resource of the demodulation reference signal, and the demodulation reference signal is used to estimate the channel state of the first channel; the time-frequency resource includes the frequency-domain resource corresponding to the first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time-domain resource corresponding to the first CDM group includes a first group of symbols and a second group of symbols, the first group of symbols corresponds to the first group of OCC, the second group of symbols corresponds to the second group of OCC, and the first group of OCC is orthogonal to the second group of OCC;

[0135] The receiving device obtains the sequence of the demodulation reference signal.

[0136] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency offset, and the OCC, where the OCC includes the frequency-domain OCC and the time-domain OCC, the time-domain OCC includes the first group of OCC and the second group of OCC, the first group of OCC corresponds to the first demodulation reference signal type, the second group of OCC corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0137] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to the first demodulation reference signal type, the second configuration information table corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0138] The first configuration information table includes the correspondence relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs;

[0139] The second information configuration table includes the correspondence relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCCs.

[0140] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence relationship between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency domain OCC and a time domain OCC. The frequency domain OCC includes a first group of OCCs and a second group of OCCs. The first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0141] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to the first demodulation reference signal type, the second configuration information table corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0142] The first configuration information table includes the correspondence relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs;

[0143] The second information configuration table includes the correspondence relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group of OCCs.

[0144] In a possible design, it further includes: The receiving device obtains a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

[0145] In a possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0146] The receiving device obtains the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE (k, l) according to the configuration information table, where the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0147] Obtain the data of the sequence of the demodulation reference signal mapped on the first RE (k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE (k, l) Satisfy:

[0148]

[0149] k = 4n + 2k'+ Δ

[0150] k' = 0, 1

[0151] s = 0, 1

[0152]

[0153] n = 0, 1,...

[0154] j = 0, 1,..., v - 1

[0155] Where W f (k') is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where, is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; where, when s = 0, the time-domain OCC is the first group of OCC; when s = 1, the time-domain OCC is the second group of OCC.

[0156] In a possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0157] The receiving device obtains the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE (k, l) according to the configuration information table, where the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0158] Obtain the data of the sequence of the demodulation reference signal mapped on the first RE (k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE (k, l) Satisfy:

[0159]

[0160] k = 4n + 2k'+ Δ

[0161] k' = 0, 1

[0162] s = 0, 1

[0163]

[0164] n = 0, 1, …

[0165] j = 0, 1, …, v - 1

[0166] Wherein, W f (k') is the frequency - domain OCC, W t (l') is the time - domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency - domain offset; wherein, is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, v is the number of transmission layers; wherein, when s = 0, the frequency - domain OCC is the first group of OCC; when s = 1, the frequency - domain OCC is the second group of OCC.

[0167] In a possible design, it further includes: the receiving device receives the port index indication information of the demodulation reference signal sent by the sending device.

[0168] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, N is the number of symbols included in the first group of symbols or the second group of symbols, and the number of symbols included in the first group of symbols and the second group of symbols is the same.

[0169] In a sixth aspect, a signal transmission method is provided, including:

[0170] The receiving device receives the demodulation reference signal sent by the sending device on the time - frequency resources of the demodulation reference signal, and the demodulation reference signal is used to estimate the channel state of the first channel;

[0171] The receiving device obtains the sequence of the demodulation reference signal;

[0172] Wherein:

[0173] The time-frequency resource includes the frequency-domain resources corresponding to the first port and the second port of the demodulation reference signal in the first CDM group. The frequency-domain resources corresponding to the first port are the same as those corresponding to the second port. The frequency-domain resources corresponding to the first port and the second port are discontinuous and arranged at equal intervals. The first PRB in the frequency-domain resources corresponding to the first port and the second port includes at least two subcarrier groups. Each of the at least two subcarrier groups includes two subcarriers. The at least two subcarrier groups include a first subcarrier group and a second subcarrier group, or include a first subcarrier group, a second subcarrier group, and a third subcarrier group.

[0174] The orthogonal spreading OCC codes used on the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the first port form a first OCC code sequence. The OCC codes used on the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the second port form a second OCC code sequence. The OCC codes used on the REs corresponding to the two subcarriers in the first subcarrier group for the frequency-domain resources corresponding to the first port or the second port form a third OCC code sequence, and the OCC codes used on the REs corresponding to the two subcarriers in the second subcarrier group form a fourth OCC code sequence. Among them, the second OCC code sequence is obtained by performing a cyclic shift on the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0175] In a possible design, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal port index, CDM group frequency-domain offset, OCC, and cyclic shift factor. Among them, the OCC includes frequency-domain OCC and time-domain OCC.

[0176] In a possible design, it further includes: The receiving device obtains the frequency-domain OCC, time-domain OCC, and cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and performs a cyclic shift on the obtained frequency-domain OCC and time-domain OCC according to the obtained cyclic shift factor.

[0177] In a possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0178] The receiving device obtains the CDM group frequency-domain offset, frequency-domain OCC, time-domain OCC, and cyclic shift factor corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l.

[0179] Obtain the data of the sequence mapping of the demodulation reference signal on the first RE(k, l) according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC, and the cyclic shift factor. The data mapped on the first RE(k, l) Satisfies:

[0180]

[0181] k = 4n + 2k′ + Δ

[0182] k′ = 0, 1

[0183]

[0184] n = 0, 1, …

[0185] j = 0, 1, …, v - 1

[0186] Alternatively, the data mapped on the first RE(k, l) Satisfies:

[0187]

[0188] k = 4n + 2k′ + Δ

[0189] k′ = 0, 1

[0190]

[0191] n = 0, 1, …

[0192] j = 0, 1, …, v - 1

[0193] Where, W f (k′) is the frequency domain OCC, W t (l′) is the time domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset; where, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, v is the number of transmission layers, φ is the cyclic shift factor, and M is a positive integer greater than or equal to 1.

[0194] In a possible design, it further includes: the receiving device receives the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0195] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0196] In a seventh aspect, there is provided a communication device including at least one processor, where the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs the following:

[0197] Generate a sequence of demodulation reference signals for estimating the channel state of a first channel.

[0198] Map the sequence of demodulation reference signals to time-frequency resources of the demodulation reference signals for transmission; the time-frequency resources include frequency-domain resources corresponding to a first code division multiplexing (CDM) group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; a first physical resource block (PRB) in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers each include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal cover codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0199] In a possible design, the first PRB further includes a third group of subcarriers, the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCCs.

[0200] In a possible design, a configuration information table of the demodulation reference signals includes the correspondence between a demodulation reference signal port index, a CDM group frequency-domain offset, and an OCC, where the OCC includes a frequency-domain OCC and a time-domain OCC, and the frequency-domain OCC includes a first group of OCCs and a second group of OCCs.

[0201] In a possible design, the configuration information table of the demodulation reference signals includes a first configuration information table and a second configuration information table;

[0202] The first configuration information table includes the correspondence between a demodulation reference signal port index, a CDM group frequency-domain offset, and an OCC, and the OCC includes a frequency-domain OCC and a time-domain OCC;

[0203] The second information configuration table includes the correspondence between a demodulation reference signal port index, a CDM group frequency-domain offset, and an OCC, the OCC includes a frequency-domain OCC and a time-domain OCC, the frequency-domain OCC includes a first group of OCCs and a second group of OCCs, and the demodulation reference signal port indices included in the second configuration information table and the first configuration information table are different.

[0204] In a possible design, it further includes: obtaining, according to the configuration information table, a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers.

[0205] In a possible design, mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal includes:

[0206] Obtaining the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE (k, l) according to the configuration information table, where the subcarrier index of the first RE (k, l) in the time-frequency resources is k and the symbol index is l;

[0207] Obtaining the data of the sequence of the demodulation reference signal mapped on the first RE (k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE (k, l) Satisfies:

[0208]

[0209] k = 4n + 2k'+ Δ

[0210] k' = 0, 1

[0211] t = mod(n, 2)

[0212]

[0213] n = 0, 1,...

[0214] j = 0, 1,..., v - 1

[0215] Where W f (k'+2t) is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where, Is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; where, when t = 0, the frequency-domain OCC is the first group of OCCs; when t = 1, the frequency-domain OCC is the second group of OCCs.

[0216] In a possible design, it further includes: sending the indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0217] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0218] In an eighth aspect, a communication device is provided, including at least one processor, where the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs:

[0219] Generate a sequence of demodulation reference signals for estimating the channel state of a first channel;

[0220] Map the sequence of demodulation reference signals to time-frequency resources of the demodulation reference signals for transmission; the time-frequency resources include frequency-domain resources corresponding to a first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time-domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0221] In a possible design, a configuration information table of the demodulation reference signals includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes a frequency-domain OCC and a time-domain OCC, the time-domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to a first demodulation reference signal type, the second group of OCCs corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0222] In a possible design, the configuration information table of the demodulation reference signals includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to a first demodulation reference signal type, the second configuration information table corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0223] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes a frequency-domain OCC and a time-domain OCC, and the time-domain OCC is the first group of OCCs;

[0224] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes a frequency-domain OCC and a time-domain OCC, and the time-domain OCC is the second group of OCCs.

[0225] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the frequency domain OCC includes a first group of OCC and a second group of OCC, the first group of OCC corresponds to the first demodulation reference signal type, the second group of OCC corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0226] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to the first demodulation reference signal type, the second configuration information table corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0227] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC, the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCC;

[0228] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC, the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group of OCC.

[0229] In a possible design, it further includes: obtaining a first group of OCC corresponding to the first group of symbols and a second group of OCC corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

[0230] In a possible design, mapping the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal includes:

[0231] Obtaining the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0232] Obtaining the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC The data mapped on the first RE(k, l) Satisfies:

[0233]

[0234] k = 4n + 2k'+ Δ

[0235] k' = 0, 1

[0236] s = 0, 1

[0237]

[0238] n = 0, 1, …

[0239] j = 0, 1, …, v - 1

[0240] wherein, W f (k') is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; wherein, is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; wherein, when s = 0, the time-domain OCC is the first group of OCC; when s = 1, the time-domain OCC is the second group of OCC.

[0241] In a possible design, mapping the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal includes:

[0242] Obtaining the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0243] Obtaining the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE(k, l) Satisfies:

[0244]

[0245] k = 4n + 2k'+ Δ

[0246] k' = 0, 1

[0247] s = 0, 1

[0248]

[0249] n = 0, 1, …

[0250] j = 0, 1, …, v - 1

[0251] Among them, W f (k′) is the frequency-domain OCC, and W t (l′) is the time-domain OCC, and r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the frequency-domain offset of the CDM group; among them, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; among them, when s = 0, the frequency-domain OCC is the first group of OCCs; when s = 1, the frequency-domain OCC is the second group of OCCs.

[0252] In a possible design, it further includes: sending the port index indication information of the demodulation reference signal to the terminal.

[0253] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols included in the first group of symbols or the second group of symbols, and the number of symbols included in the first group of symbols and the second group of symbols is the same.

[0254] In a ninth aspect, a communication device is provided, including at least one processor, the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs:

[0255] Generate a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate the channel state of the first channel;

[0256] Map the sequence of the demodulation reference signals to the time-frequency resources of the demodulation reference signals and send them; the time-frequency resources include the frequency-domain resources corresponding to the first port and the second port in the first CDM group, and the frequency-domain resources corresponding to the first port and the second port are discontinuous and arranged at equal intervals;

[0257] Among them:

[0258] The time-frequency resources include the frequency-domain resources corresponding to the first port of the demodulation reference signal and the second port of the demodulation reference signal in the first CDM group. The frequency-domain resources corresponding to the first port are the same as the frequency-domain resources corresponding to the second port. The frequency-domain resources corresponding to the first port and the frequency-domain resources corresponding to the second port are discontinuous and arranged at equal intervals. The first PRB in the frequency-domain resources corresponding to the first port and the frequency-domain resources corresponding to the second port includes at least two subcarrier groups. Each subcarrier group in the at least two subcarrier groups includes two subcarriers. The at least two subcarrier groups include a first subcarrier group and a second subcarrier group or include a first subcarrier group, a second subcarrier group, and a third subcarrier group;

[0259] The orthogonal spreading OCC codes used for the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the first port form a first OCC code sequence. The OCC codes used for the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the second port form a second OCC code sequence. The OCC codes used for the REs corresponding to two subcarriers in the first subcarrier group for the frequency-domain resources corresponding to the first port or the second port form a third OCC code sequence, and the OCC codes used for the REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence. Wherein, the second OCC code sequence is obtained by circularly shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0260] In a possible design, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency-domain offset, the OCC, and the cyclic shift factor, where the OCC includes the frequency-domain OCC and the time-domain OCC.

[0261] In a possible design, it further includes: obtaining the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and circularly shifting the obtained frequency-domain OCC and time-domain OCC according to the obtained cyclic shift factor.

[0262] In a possible design, mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal includes:

[0263] Obtaining the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor corresponding to the first RE(k,l) according to the configuration information table, where the subcarrier index of the first RE(k,l) in the time-frequency resources is k and the symbol index is l;

[0264] Obtaining the data of the sequence of the demodulation reference signal mapped on the first RE(k,l) according to the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor The data mapped on the first RE(k,l) Satisfies:

[0265]

[0266] k = 4n + 2k′ + Δ

[0267] k′ = 0, 1

[0268]

[0269] n = 0, 1, …

[0270] j = 0, 1, …, v - 1

[0271] Alternatively, the data mapped on the first RE(k, l) satisfies:

[0272]

[0273] k = 4n + 2k′ + Δ

[0274] k′ = 0, 1

[0275]

[0276] n = 0, 1, …

[0277] j = 0, 1, …, v - 1

[0278] wherein, W f (k′) is the frequency - domain OCC, W t (l′) is the time - domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency - domain offset; wherein, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, v is the number of transmission layers, φ is the cyclic shift factor, and M is a positive integer greater than or equal to 1.

[0279] In a possible design, it further includes: sending the indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0280] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0281] In a tenth aspect, a communication device is provided, including at least one processor, the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs:

[0282] Receive the demodulation reference signal sent by the transmitting device on the time-frequency resources of the demodulation reference signal, where the demodulation reference signal is used to estimate the channel state of the first channel; the time-frequency resources include the frequency-domain resources corresponding to the first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the first PRB in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers each include 2 subcarriers, the first group of subcarriers corresponds to the first group of OCCs, the second group of subcarriers corresponds to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

[0283] Obtain the sequence of the demodulation reference signal.

[0284] In a possible design, the first PRB further includes a third group of subcarriers, the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCCs.

[0285] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes the frequency-domain OCC and the time-domain OCC, and the frequency-domain OCC includes the first group of OCCs and the second group of OCCs.

[0286] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

[0287] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, and the OCC includes the frequency-domain OCC and the time-domain OCC;

[0288] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes the frequency-domain OCC and the time-domain OCC, the frequency-domain OCC includes the first group of OCCs and the second group of OCCs, and the demodulation reference signal port indexes included in the second configuration information table and the first configuration information table are different.

[0289] In a possible design, it further includes: obtaining the first group of OCCs corresponding to the first group of subcarriers and the second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

[0290] In a possible design, obtaining the sequence of the demodulation reference signal includes:

[0291] According to the configuration information table, obtain the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE (k, l), where the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0292] According to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC, obtain the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) The data mapped on the first RE (k, l) Satisfy:

[0293]

[0294] k = 4n + 2k' + Δ

[0295] k' = 0, 1

[0296] t = mod(n, 2)

[0297]

[0298] n = 0, 1,...

[0299] j = 0, 1,..., v - 1

[0300] Where, W f (k' + 2t) is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where, is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; where, when t = 0, the frequency-domain OCC is the first group of OCC; when t = 1, the frequency-domain OCC is the second group of OCC.

[0301] In a possible design, it further includes: receiving the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0302] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0303] In the eleventh aspect, a communication device is provided, including at least one processor, the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device executes:

[0304] Receive the demodulation reference signal sent by the transmitting device on the time-frequency resources of the demodulation reference signal, where the demodulation reference signal is used to estimate the channel state of the first channel; the time-frequency resources include the frequency-domain resources corresponding to the first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time-domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

[0305] Obtain the sequence of the demodulation reference signal.

[0306] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes a frequency-domain OCC and a time-domain OCC, the time-domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to a first demodulation reference signal type, the second group of OCCs corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0307] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to a first demodulation reference signal type, the second configuration information table corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0308] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes a frequency-domain OCC and a time-domain OCC, and the time-domain OCC is the first group of OCCs;

[0309] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes a frequency-domain OCC and a time-domain OCC, and the time-domain OCC is the second group of OCCs.

[0310] In a possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency domain OCC and a time domain OCC. The frequency domain OCC includes a first group of OCC and a second group of OCC. The first group of OCC corresponds to the first demodulation reference signal type, the second group of OCC corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0311] In a possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to the first demodulation reference signal type, the second configuration information table corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols;

[0312] The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCC;

[0313] The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group of OCC.

[0314] In a possible design, it further includes: obtaining a first group of OCC corresponding to the first group of symbols and a second group of OCC corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

[0315] In a possible design, obtaining the sequence of the demodulation reference signal includes:

[0316] Obtaining the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0317] Obtaining the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC The data mapped on the first RE(k, l) Satisfies:

[0318]

[0319] k = 4n + 2k'+ Δ

[0320] k' = 0, 1

[0321] s = 0, 1

[0322]

[0323] n = 0, 1, …

[0324] j = 0, 1, …, v - 1

[0325] where W f (k') is the frequency-domain OCC, W t (l') is the time-domain OCC, r(2n + k') is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; where when s = 0, the time-domain OCC is the first group of OCC; when s = 1, the time-domain OCC is the second group of OCC.

[0326] In a possible design, obtaining the sequence of the demodulation reference signal includes:

[0327] According to the configuration information table, obtain the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE(k, l), where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0328] According to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC, obtain the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) The data mapped on the first RE(k, l) Satisfies:

[0329]

[0330] k = 4n + 2k'+ Δ

[0331] k' = 0, 1

[0332] s = 0, 1

[0333]

[0334] n = 0, 1, …

[0335] j = 0, 1, …, v - 1

[0336] where W f(k′) is the frequency-domain OCC, W t (l′) is the time-domain OCC, and r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers; where, when s = 0, the frequency-domain OCC is the first group of OCCs; when s = 1, the frequency-domain OCC is the second group of OCCs.

[0337] In a possible design, it further includes: receiving port index indication information of the demodulation reference signal sent by the sending device.

[0338] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols included in the first group of symbols or the second group of symbols, and the number of symbols included in the first group of symbols and the second group of symbols is the same.

[0339] In a twelfth aspect, a communication device is provided, including at least one processor, the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs:

[0340] Receiving a demodulation reference signal sent by a sending device on the time-frequency resources of the demodulation reference signal, where the demodulation reference signal is used to estimate the channel state of a first channel;

[0341] Obtaining the sequence of the demodulation reference signal;

[0342] Wherein:

[0343] The time-frequency resources include the frequency-domain resources corresponding to the first port and the second port of the demodulation reference signal in the first CDM group, the frequency-domain resources corresponding to the first port are the same as the frequency-domain resources corresponding to the second port, the frequency-domain resources corresponding to the first port and the frequency-domain resources corresponding to the second port are discontinuous and arranged at equal intervals, the first PRB in the frequency-domain resources corresponding to the first port and the frequency-domain resources corresponding to the second port includes at least two subcarrier groups, each of the at least two subcarrier groups includes two subcarriers, and the at least two subcarrier groups include a first subcarrier group and a second subcarrier group or include a first subcarrier group, a second subcarrier group, and a third subcarrier group;

[0344] The orthogonal spreading OCC codes used for the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the first port form a first OCC code sequence, the OCC codes used for the REs corresponding to all subcarriers in the at least two subcarrier groups for the frequency-domain resources corresponding to the second port form a second OCC code sequence, the OCC codes used for the REs corresponding to two subcarriers in the first subcarrier group for the frequency-domain resources corresponding to the first port or the second port form a third OCC code sequence, and the OCC codes used for the REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by circularly shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0345] In a possible design, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency-domain offset, the OCC, and the cyclic shift factor, wherein the OCC includes the frequency-domain OCC and the time-domain OCC.

[0346] In a possible design, it further includes: obtaining the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and circularly shifting the obtained frequency-domain OCC and time-domain OCC according to the obtained cyclic shift factor.

[0347] In a possible design, obtaining the sequence of the demodulation reference signal includes:

[0348] obtaining the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor corresponding to the first RE(k, l) according to the configuration information table, where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l;

[0349] obtaining the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor the data mapped on the first RE(k, l) satisfies:

[0350]

[0351] k = 4n + 2k′ + Δ

[0352] k′ = 0, 1

[0353]

[0354] n = 0, 1, …

[0355] j = 0, 1, …, v - 1

[0356] Alternatively, the data mapped on the first RE (k, l) satisfies:

[0357]

[0358] k = 4n + 2k′ + Δ

[0359] k′ = 0, 1

[0360]

[0361] n = 0, 1, …

[0362] j = 0, 1, …, v - 1

[0363] wherein, W f (k′) is the frequency - domain OCC, W t (l′) is the time - domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency - domain offset; wherein, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, v is the number of transmission layers, φ is the cyclic shift factor, and M is a positive integer equal to 1 or greater than 1.

[0364] In a possible design, it further includes: receiving the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0365] In a possible design, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0366] In a thirteenth aspect, a chip is provided. The chip is coupled to a memory and is configured to read and execute program instructions stored in the memory to implement the method according to any one of the first to sixth aspects above.

[0367] In a fourteenth aspect, a computer - readable storage medium is provided. The computer - readable storage medium stores computer instructions, and when the instructions are run on a computer, the computer is caused to execute the method according to any one of the first to sixth aspects above.

[0368] In a fifteenth aspect, a computer program product is provided. When the computer program product is called by a computer, the computer is caused to execute the method according to any one of the first to sixth aspects above. Description of the Drawings

[0369] Figure 1 A schematic diagram of a network architecture provided by an embodiment of the present application;

[0370] Figure 2 A schematic diagram of a DMRS pilot pattern in an embodiment of the present application;

[0371] Figure 3 A flowchart of a method for transmitting a demodulation reference signal implemented on the transmitting device side provided by an embodiment of the present application;

[0372] Figure 4 A schematic diagram of the correspondence between DMRS time-frequency resources, subcarrier groups, and OCC groups in an embodiment of the present application;

[0373] Figure 5 A schematic diagram of the OCC corresponding to the ports in CDM group 0 for DMRS time-frequency resources in an embodiment of the present application;

[0374] Figure 6 A flowchart of a method for transmitting a demodulation reference signal implemented on the receiving device side provided by an embodiment of the present application;

[0375] Figure 7 A flowchart of a method for transmitting a demodulation reference signal implemented on the transmitting device side provided by an embodiment of the present application;

[0376] Figure 8 A schematic diagram of the correspondence between DMRS time-frequency resources, symbol groups, and OCC groups in an embodiment of the present application;

[0377] Figure 9 A schematic diagram of the OCC corresponding to the ports in CDM group 0 for DMRS time-frequency resources in an embodiment of the present application;

[0378] Figure 10 A flowchart of a method for transmitting a demodulation reference signal implemented on the receiving device side provided by an embodiment of the present application;

[0379] Figure 11 A flowchart of a method for transmitting a demodulation reference signal implemented on the transmitting device side provided by an embodiment of the present application;

[0380] Figure 12 A schematic diagram of the OCC code used when mapping DMRS to RE in an embodiment of the present application;

[0381] Figure 13 A flowchart of a method for transmitting a demodulation reference signal implemented on the receiving device side provided by an embodiment of the present application;

[0382] Figure 14 A schematic diagram of the structure of a communication device provided by an embodiment of the present application;

[0383] Figure 15 Schematic structural diagram of the communication device provided by the embodiment of the present application;

[0384] Figure 16 Schematic structural diagram of the communication device provided by the embodiment of the present application;

[0385] Figure 17 Schematic structural diagram of the communication device provided by another embodiment of the present application. Detailed implementation manners

[0386] In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0387] Hereinafter, some terms in the embodiments of the present application will be explained to facilitate the understanding of those skilled in the art.

[0388] 1) A terminal device, including a device that provides voice and / or data connectivity to a user. For example, it may include a handheld device with wireless connection capabilities, or a processing device connected to a wireless modem. The terminal device can communicate with the core network via a radio access network (RAN) and exchange voice and / or data with the RAN. The terminal device may include a user equipment (UE), a wireless terminal device, a mobile terminal device, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point (AP), a remote terminal device, an access terminal device, a user terminal device, a user agent, or a user device, etc. For example, it may include a mobile phone (or a "cellular" phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device, a smart wearable device, etc. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), etc. Also included are restricted devices, such as devices with lower power consumption, or devices with limited storage capacity, or devices with limited computing power, etc. For example, it includes information sensing devices such as barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners, etc.

[0389] By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. A wearable device, also known as a wearable intelligent device, is a general term for devices developed by applying wearable technology to the intelligent design of daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothing or accessories. A wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can realize complete or partial functions without relying on a smartphone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smartphones, such as various smart bracelets for vital sign monitoring, smart helmets, and smart jewelry.

[0390] 2) A network device, for example, includes an access network (AN) device, such as a base station (e.g., an access point), which may refer to a device in the access network that communicates with a wireless terminal device through one or more cells over the air interface. The network device can be used to mutually convert the received air frames and Internet Protocol (IP) packets, and act as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The network device can also coordinate the attribute management of the air interface. For example, the network device may include an evolved NodeB (NodeB or eNB or e-NodeB, evolutional NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), or may also include a next generation NodeB (gNB) in a fifth generation (5G) New Radio (NR) system, or may also include a centralized unit (CU) and a distributed unit (DU) in a Cloud Radio Access Network (CloudRAN) system. The embodiments of the present application do not limit this.

[0391] 3) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. "Multiple" means two or more than two. In view of this, in the embodiments of the present application, "multiple" may also be understood as "at least two". "At least one" can be understood as one or more, for example, understood as one, two or more. For example, including at least one means including one, two or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then what can be included are A, B, C, A and B, A and C, B and C, or A, B, and C. "And / or" describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally represents an "or" relationship between the associated objects before and after.

[0392] Unless otherwise stated, the ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects and are not used to limit the order, time sequence, priority or importance of multiple objects.

[0393] The embodiments of the present application can be applied to various communication systems. For example, they can be applied to LTE systems, LTE-A systems, NR systems or new communication systems emerging in the future development of communications. As long as there are entities in the communication system that use different orthogonal mask groups to transmit demodulation reference signals on the time-frequency resources corresponding to the same CDM group, so as to achieve the purpose of increasing the number of orthogonal demodulation reference signal ports supported by the system, the communication method provided by the embodiments of the present application can be adopted.

[0394] See Figure 1 As shown, it is a communication system to which the embodiments of the present application can be applied. In Figure 1 the shown communication system, there are a network device 101 and 4 terminal devices (102a to 102d). The network device 101 can send downlink data and DMRS to the terminal devices (102a to 102d). Any one of the terminal devices (102a to 102d) can perform downlink channel estimation according to the received DMRS, and send DMRS and uplink data to the network device 101. The network device performs uplink channel estimation according to the received DMRS.

[0395] Among them, the network device 101 is used to receive uplink signals from the terminal devices (102a to 102d) or send downlink signals to the terminal devices. The network device 101 can be a network device of LTE and / or NR. Specifically, it can be a base station (NodeB), an evolved base station (eNodeB), a base station (gNB) in a 5G NR mobile communication system, a base station in a future mobile communication system or an access node in a Wi-Fi system, etc.

[0396] The terminal devices (102a - 102d) are entities on the user side for receiving or transmitting signals, used to send uplink signals to the network device or receive downlink signals from the network device. The terminal devices (102a - 102d) mainly include mobile phones, vehicles, tablets, smart speakers, train detectors, gas station sensors, etc. Their main functions include collecting data (for some terminal devices), receiving control information and downlink data from the network device, and transmitting electromagnetic waves to send uplink data to the network device.

[0397] Figure 1 This is only an example and does not limit the type of communication system, the number, type, etc. of the devices included in the communication system. The network architecture and service scenarios described in the embodiments of this application are for illustrating the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those of ordinary skill in the art know that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems.

[0398] Based on Figure 1 Taking the NR system as an example in the shown communication system, in the current NR protocol, the DFT - S - OFDM waveform can support a maximum of 8 orthogonal DMRS ports, that is, it can support 8 - layer multi - user orthogonal pairing. The CP - OFDM waveform can support a maximum of 12 orthogonal DMRS ports, that is, it can support 12 - layer multi - user orthogonal pairing. For the CP - OFDM waveform, the system supports two types of DMRS configurations, namely Type 1 DMRS (also referred to as the first configuration type in the following embodiments) and Type 2 DMRS (also referred to as the second configuration type in the following embodiments). Among them, Type 1 DMRS supports 8 - port DMRS orthogonality, and the frequency - domain density is higher than that of Type 2 DMRS.

[0399] Each cell independently configures a set of DMRS generation parameters for the terminal. According to the different time - domain positions of DMRS, it can be divided into Front - loaded DMRS and Additional DMRS. Front - loaded DMRS is placed in the first few symbols within a time slot, and a maximum of two symbols can be configured. In the frequency domain, different DMRS ports are divided into different code - division multiplexing (CDM) groups (CDM group). In addition, for the DMRS ports within the same CDM group, orthogonal cover code (OCC) is used for time - frequency domain expansion, and the orthogonality on different ports can be guaranteed, thereby improving the accuracy of channel estimation. Different CDM groups are orthogonal in the frequency domain, that is, they occupy different sub - carriers.

[0400] Among them, two sequences or vectors are orthogonal, which means that the inner product of these two sequences or vectors is equal to 0.

[0401] Figure 2 The time-frequency resource position of the DMRS (i.e., the DMRS pilot pattern) using the first configuration type (Type 1 DMRS) is exemplarily shown, where the resource elements (REs) shown by different filling patterns belong to different CDM groups. p0, p1, …, p7 represent the DMRS port indices.

[0402] As Figure 2 shown, for Type 1 DMRS, when 1 symbol is configured for DMRS transmission, cyclic shift of the sequence or frequency-domain OCC is used in the frequency domain to ensure the orthogonality of the sequences on 2 DMRS ports within the same CDM group; when 2 symbols are configured for DMRS transmission, within the same CDM group, frequency-domain cyclic shift or frequency-domain OCC (code length of 2) and time-domain OCC (code length of 2) are used to ensure the orthogonality of the sequences on 4 DMRS ports within the CDM group.

[0403] From Figure 2 it can be known that Type 1 DMRS contains two CDM groups and can only support a maximum of 8 orthogonal DMRS ports. If the number of layers paired by the network exceeds 8 layers (for example, up to 16 layers), the orthogonality of the DMRS ports cannot be guaranteed, resulting in a decline in the channel estimation performance, affecting the demodulation performance of the PUSCH, and being unfavorable for the improvement of the uplink capacity. Similarly, the above problems also exist in the downlink DMRS transmission.

[0404] Based on the above existing problems, the embodiments of the present application provide a signal transmission method and device to increase the number of orthogonal demodulation reference signal ports supported by the system without additional overhead of the demodulation reference signal. Among them, the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving problems are similar, the implementation of the device and the method can be referred to each other, and the repeated parts will not be elaborated.

[0405] The embodiments of the present application are applicable to the transmission of the downlink demodulation reference signal and also applicable to the transmission of the uplink demodulation reference signal.

[0406] Referring to Figure 3 shown, it is a flowchart of a signal transmission method implemented on the sending device side provided by the embodiments of the present application. This method can be applied to Figure 1 the network architecture shown, and of course, it can also be applied to network architectures other than this. The present application does not make any limitations in this regard. When this method is applied to Figure 1When the network architecture shown is considered, for downlink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 the network device 101 in Figure 1 , and the receiving device involved in this method may be the terminal devices (102a to 102d) in Figure 1 ; for uplink demodulation reference signal transmission, the transmitting device involved in this method may be the terminal devices (102a to 102d) in Figure 1 , and the receiving device involved in this method may be the network device 101 in

[0407] Refer to Figure 3 shown, this method may include the following processing flow:

[0408] S301: The transmitting device generates a sequence of demodulation reference signals.

[0409] The demodulation reference signal is used to estimate the channel state of the first channel. Among them, the demodulation reference signal is used to estimate the channel state of the first channel, which can be understood as that the demodulation reference signal is the demodulation reference signal of the first channel. For downlink demodulation reference signal transmission, the first channel is used to carry uplink data; for uplink demodulation reference signal transmission, the first channel is used to carry downlink data.

[0410] Specifically, the demodulation reference signal may be the DMRS for downlink transmission, which is used for channel estimation of the PUSCH, or the demodulation reference signal may also be the DMRS for uplink transmission, which is used for channel estimation of the PDSCH.

[0411] More specifically, this DMRS may be the DMRS based on the CP - OFDM waveform, the DMRS configuration type is the first configuration type (Type 1 DMRS), and the time - domain position of the DMRS is the previous one or two symbols within a time slot (i.e., Front - loaded DMRS).

[0412] Taking the DMRS based on the CP - OFDM waveform as an example, the DMRS sequence can be generated based on the gold sequence. Specifically, the following formula can be used to generate the DMRS sequence:

[0413]

[0414] Among them, r(n) is the DMRS sequence, c(i) is a binary sequence, which is a pseudo - random sequence and needs to be initialized during generation. The generation formula of this pseudo - random sequence is:

[0415]

[0416] Among them, N C= 1600, x1(n) can be initialized as x1(0) = 1, x1(n) = 0, n = 1, 2, …, 30, and x2(n) satisfies

[0417] For the DMRS sequence corresponding to PUSCH, initialize the seed c init It is defined as:

[0418]

[0419] where l is the OFDM symbol index, is the number of time slots within a frame, is the number of symbols within a time slot, n SCID ∈ {0, 1} is the DMRS sequence initialization parameter, is the mask. Its value depends on different high-layer parameter configurations.

[0420] S302: The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and transmits it.

[0421] The time-frequency resources to which the sequence of the demodulation reference signal is mapped may include the time-frequency resources corresponding to the first CDM group. The frequency-domain resources in the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals. The first PRB in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers; among them, the first PRB can be any PRB in the frequency-domain resources corresponding to the first CDM group.

[0422] The time-frequency resources to which the sequence of the demodulation reference signal is mapped may also include the time-frequency resources corresponding to the second CDM group. The frequency-domain resources in the frequency-domain resources corresponding to the second CDM group are discontinuous and arranged at equal intervals. The first PRB in the frequency-domain resources corresponding to the second CDM group includes a first group of subcarriers and a second group of subcarriers; among them, the first PRB can be any PRB in the frequency-domain resources corresponding to the second CDM group.

[0423] The first group of subcarriers corresponds to the first group of OCC, the second group of subcarriers corresponds to the second group of OCC, and the first group of OCC is orthogonal to the second group of OCC.

[0424] The above-mentioned first group of subcarriers and the second group of subcarriers each include 2 subcarriers. Correspondingly, the frequency-domain resources in the frequency-domain resources corresponding to the first CDM group and the second CDM group are discontinuous and arranged at equal intervals, which can be understood as: the subcarriers in the frequency-domain resources corresponding to the first CDM group and the second CDM group are distributed at intervals, and the interval distance is one subcarrier.

[0425] In some embodiments, a third group of subcarriers is further included in a first PRB of the frequency-domain resources corresponding to the first CDM group and / or the second CDM group, the third group of subcarriers includes two subcarriers, and the third group of subcarriers corresponds to the first group of OCC.

[0426] Taking an example that a PRB in the frequency-domain resources corresponding to one CDM group includes three groups of subcarriers (a first group of subcarriers, a second group of subcarriers, and a third group of subcarriers), in some examples, the first group of subcarriers of the first CDM group in the PRB includes the first subcarrier and the third subcarrier in the PRB, the second group of subcarriers of the first CDM group in the PRB includes the fifth subcarrier and the seventh subcarrier in the PRB, and the third group of subcarriers of the first CDM group in the PRB includes the ninth subcarrier and the eleventh subcarrier in the PRB; the first group of subcarriers of the second CDM group in the PRB includes the second subcarrier and the fourth subcarrier in the PRB, the second group of subcarriers of the second CDM group in the PRB includes the sixth subcarrier and the eighth subcarrier in the PRB, and the third group of subcarriers of the second CDM group in the PRB includes the tenth subcarrier and the twelfth subcarrier in the PRB. The first subcarrier to the twelfth subcarrier in the PRB may be arranged in the order of increasing subcarrier index or frequency, or in the order of decreasing subcarrier index or frequency.

[0427] Of course, the above is only one example. In other examples, the first group of subcarriers of the first CDM group in the PRB includes the second subcarrier and the fourth subcarrier in the PRB, the second group of subcarriers of the first CDM group in the PRB includes the sixth subcarrier and the eighth subcarrier in the PRB, and the third group of subcarriers of the first CDM group in the PRB includes the tenth subcarrier and the twelfth subcarrier in the PRB; the first group of subcarriers of the second CDM group in the PRB includes the first subcarrier and the third subcarrier in the PRB, the second group of subcarriers of the second CDM group in the PRB includes the fifth subcarrier and the seventh subcarrier in the PRB, and the third group of subcarriers of the second CDM group in the PRB includes the ninth subcarrier and the eleventh subcarrier in the PRB.

[0428] In some embodiments of the present application, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal. For example, if the demodulation reference signal is transmitted using one symbol, at most 4 demodulation reference signal ports can be included in each CDM group, and thus two CDM groups can support at most 8 demodulation reference signal ports; if the demodulation reference signal is transmitted using two symbols, at most 8 demodulation reference signal ports can be included in each CDM group, and thus two CDM groups can support at most 16 demodulation reference signal ports.

[0429] According to the above embodiments, taking the DMRS with the configuration type being the first configuration type (Type 1 DMRS) as an example, and the time domain position of the DMRS being the previous one or two symbols within a time slot (i.e., Front-loaded DMRS), in some embodiments of the present application, the time-frequency resource position of the DMRS can be as Figure 4 shown.

[0430] As Figure 4 shown, when configuring 1 symbol for DMRS transmission, frequency domain OCC is adopted in the frequency domain to ensure the orthogonality of the sequences on 4 DMRS ports within the same CDM group; when configuring 2 symbols for DMRS transmission, frequency domain OCC is adopted in the frequency domain and time domain OCC is adopted in the time domain to ensure the orthogonality of the sequences on 8 DMRS ports within the same CDM group.

[0431] Figure 4 In Figure 4 , when configuring 2 symbols, the subcarriers corresponding to CDM group 0 include subcarriers {0, 2, 4, 6, 8, 10}, where subcarriers {0, 2} form the first group of subcarriers, subcarriers {4, 6} form the second group of subcarriers, and subcarriers {8, 10} form the third group of subcarriers. The first group of subcarriers corresponds to the first group of OCC, the second group of subcarriers corresponds to the second group of OCC, the third group of subcarriers corresponds to the first group of OCC, and the first group of OCC is orthogonal to the second group of OCC.

[0432] The subcarriers corresponding to CDM group 1 include subcarriers {1, 3, 5, 7, 9, 11}, where subcarriers {1, 3} form the first group of subcarriers, subcarriers {5, 7} form the second group of subcarriers, and subcarriers {9, 11} form the third group of subcarriers. The first group of subcarriers and the third group of subcarriers correspond to the same group of OCC and are orthogonal to the group of OCC corresponding to the second group of subcarriers.

[0433] Figure 4 In Figure 4 , when configuring 1 symbol, the subcarriers corresponding to CDM group 0 include subcarriers {0, 2, 4, 6, 8, 10}, where subcarriers {0, 2} form the first group of subcarriers, subcarriers {4, 6} form the second group of subcarriers, and subcarriers {8, 10} form the third group of subcarriers. The subcarriers corresponding to CDM group 1 include subcarriers {1, 3, 5, 7, 9, 11}, where subcarriers {1, 3} form the first group of subcarriers, subcarriers {5, 7} form the second group of subcarriers, and subcarriers {9, 11} form the third group of subcarriers. The first group of subcarriers and the third group of subcarriers correspond to the same group of OCC and are orthogonal to the group of OCC corresponding to the second group of subcarriers.

[0434] It should be noted that Figure 4In this case, when configuring 1 symbol for DMRS transmission, only taking CDM group 0 including DMRS ports {p0, p1, p4, p5} and CDM group 1 including DMRS ports {p2, p3, p6, p7} as an example for description. In some other embodiments, the port combinations included in CDM group 0 and CDM group 1 can also be other cases. For example, CDM group 0 includes DMRS ports {p0, p1, p6, p7}, and CDM group 1 includes DMRS ports {p2, p3, p4, p5}, which will not be enumerated one by one here. When configuring 2 symbols for DMRS transmission, only taking CDM group 0 including DMRS ports {p0, p1, p4, p5, p8, p9, p12, p13} and CDM group 1 including DMRS ports {p2, p3, p6, p7, p10, p11, p14, p15} as an example for description. In some other embodiments, the port combinations included in CDM group 0 and CDM group 1 can also be other cases. For example, CDM group 0 includes DMRS ports {p0, p1, p4, p5, p10, p11, p14, p15}, and CDM group 1 includes DMRS ports {p2, p3, p6, p7, p8, p9, p12, p13}, which will not be enumerated one by one here.

[0435] It should also be noted that the symbol position for transmitting DMRS is configurable. Figure 4 Only taking the symbol with configuration index 2 for transmitting DMRS, or the symbols with configuration indexes 2 and 3 for transmitting DMRS as examples. In some other embodiments, other symbols can also be configured to transmit DMRS.

[0436] It can be seen from the above embodiments that the embodiments of the present application do not additionally increase the time-frequency resource overhead of the demodulation reference signal. Instead, by dividing the subcarriers on one PRB within the frequency-domain resources corresponding to one CDM group into a first group of subcarriers and a second group of subcarriers, and making the first group of subcarriers correspond to the first group of OCCs, the second group of subcarriers correspond to the second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal, the number of mutually orthogonal demodulation reference signal ports within one CDM group can be increased, and thus the number of orthogonal demodulation reference signal ports that the system can support can be improved.

[0437] Applying the above embodiments of the present application to DMRS with a configuration type of Type 1 DMRS, 16 DMRS ports can be supported orthogonally without increasing the DMRS overhead, realizing 16-layer orthogonal multi-user pairing, which is beneficial to reducing the inter-layer interference between DMRSs and obtaining more accurate channel estimation results.

[0438] In an embodiment of the present application, after generating a demodulation reference signal sequence, the transmitting device can obtain the OCC by querying the configuration information table of the demodulation reference signal, and perform the mapping of the demodulation reference signal sequence to time-frequency resources according to the OCC, that is, map the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal.

[0439] In some embodiments, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group of OCC and a second group of OCC. The transmitting device can obtain the first group of OCC corresponding to the first group of subcarriers and the second group of OCC corresponding to the second group of subcarriers according to the above configuration information table, and thus map the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal according to the obtained OCC.

[0440] In some other embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, and the demodulation reference signal port indexes included in the first configuration information table and the second configuration information table are different. The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC. The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group of OCC and a second group of OCC. The transmitting device can obtain the first group of OCC corresponding to the first group of subcarriers and the second group of OCC corresponding to the second group of subcarriers according to the configuration information table, and thus map the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal according to the obtained OCC.

[0441] In some embodiments of the present application, the transmitting device can map the demodulation reference signal sequence to the time-frequency resources of the demodulation reference signal according to the following formula:

[0442]

[0443] k = 4n + 2k'+ Δ

[0444] k' = 0, 1

[0445] t = mod(n, 2)

[0446]

[0447] n = 0, 1,...

[0448] j = 0, 1,..., v - 1

[0449] Among them, Data representing the sequence mapping of the demodulation reference signal on RE(k, l), where k is the subcarrier index and l is the symbol index; W f (k′ + 2t) is the frequency-domain OCC, W t (l′) is the time-domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers. When t = 0, the frequency-domain OCC is the first group of OCC; when t = 1, the frequency-domain OCC is the second group of OCC. The first group of OCC corresponds to the first group of subcarriers, and the second group of OCC corresponds to the second group of subcarriers.

[0450] In the above formula (4), the expression of the frequency-domain OCC W f (k′ + 2t) can also be replaced by the following expression: W f (k′, t), and the mapping method is the same as the mapping method described above.

[0451] In some embodiments, based on the above formula (4), the process by which the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal may include the following steps:

[0452] Step 1: The transmitting device obtains the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to RE(k, l) according to the configuration information table of the demodulation reference signal;

[0453] Step 2: The transmitting device obtains the data of the sequence mapping of the demodulation reference signal on RE(k, l) according to the obtained CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC where the data mapped on RE(k, l) satisfies the above formula (4), that is, the transmitting device can perform processing using formula (4) based on the obtained CDM frequency-domain offset, frequency-domain OCC, and time-domain OCC, so as to obtain the data of the sequence mapping of the demodulation reference signal on RE(k, l)

[0454] Next, in combination with the formula (4) that the above mapping process needs to satisfy, and respectively in combination with the above two different setting methods of the demodulation reference signal configuration information table, taking the DMRS with the configuration type of the first configuration type (Type 1 DMRS) as an example, the implementation process of the embodiments of the present application will be described.

[0455] In some embodiments of the present application, a configuration information table can be set for DMRS, which includes 16 DMRS port indexes, as well as the CDM group frequency domain offset and OCC corresponding to each DMRS port index. Among them, the frequency domain OCC includes a first group of OCC and a second group of OCC. The first group of OCC corresponds to the first group of subcarriers, and the second group of OCC corresponds to the second group of subcarriers. Specifically, it can be shown in Table 1 as follows.

[0456] Table 1 exemplarily shows a configuration information table of DMRS provided by an embodiment of the present application.

[0457] Table 1: DMRS Configuration Information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1)

[0458]

[0459] In Table 1, represents the DMRS port index, λ represents the CDM group index, Δ represents the CDM group frequency domain offset (the CDM group frequency domain offset takes values of 0 and 1), and W f (k′ + 2t) is the frequency domain OCC, and W t (l′) is the time domain OCC. The frequency domain OCC includes two groups. Among them, the group of OCC corresponding to t = 0 is the first group of OCC, and the group of OCC corresponding to t = 1 is the second group of OCC.

[0460] In Table 1, the DMRS ports with port indexes from 8 to 15 are the newly added ports in the present application embodiment based on the existing ports. Although the OCC corresponding to the DMRS ports with port indexes from 0 to 7 has also been expanded, the expanded frequency domain OCC (the 2 columns of frequency domain OCC corresponding to t = 1) are the same as the original frequency domain OCC (the 2 columns of frequency domain OCC corresponding to t = 0), so that the OCC corresponding to the DMRS ports with port indexes from 0 to 7 in Table 1 is the same as the OCC corresponding to the DMRS ports in the original DMRS configuration information table. This shows that the newly added DMRS ports do not affect the use of the original DMRS ports and can be compatible with the receiving devices of the original standard.

[0461] Taking the configuration of 2 symbols as an example, if the transmitting device configures the DMRS ports {p0, p1, p4, p5, p8, p9, p12, p13} in CDM group 0 for the receiving device, after generating the DMRS sequence, the transmitting device can query Table 1 above according to the DMRS port index to obtain the corresponding OCC, and map the DMRS sequence to the corresponding time-frequency resources according to the obtained OCC using the above formula (4).

[0462] Taking Figure 4Taking the time-frequency resources shown as an example, the sequences of each DMRS port in CDM group 0 can be mapped to Figure 4 the REs filled with slashes in

[0463] Taking the sequence of DMRS port p8 as an example, and the initial symbol index of DMRS is 2, l′ = 0, 1 (i.e., DMRS is transmitted on the symbols with indexes equal to 2 and 3):

[0464] When n = 0, then:

[0465] t = mod(n, 2) = 0;

[0466] When k′ = 0, l′ = 0, k = 4n + 2k′ + Δ = 0, By querying Table 1, W f (k′ + 2t) = 1, W t (l′) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(0, 2) are (1, 1) respectively;

[0467] When k′ = 0, l′ = 1, k = 4n + 2k′ + Δ = 0, By querying Table 1, W f (k′ + 2t) = 1, W t (l′) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(0, 3) are (1, 1) respectively;

[0468] When k′ = 1, l′ = 0, k = 4n + 2k′ + Δ = 2, By querying Table 1, W f (k′ + 2t) = 1, W t (l′) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(2, 2) are (1, 1) respectively;

[0469] When k′ = 1, l′ = 1, k = 4n + 2k′ + Δ = 2, By querying Table 1, W f (k′ + 2t) = 1, W t (l′) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(2, 3) are (1, 1) respectively;

[0470] According to the OCCs used by DMRS port p8 in the first group of subcarriers (subcarrier indexes are 0 and 2) of CDM group 0 and the 4 REs corresponding to symbol 2 and symbol 3, a set of frequency-domain OCCs {1, 1, 1, 1} can be obtained.

[0471] When n = 1, we have:

[0472] t = mod(n, 2) = 1;

[0473] When k' = 0, l' = 0, k = 4n + 2k' + Δ = 4, By querying Table 1, we can obtain W f (k' + 2t) = -1, W t (l') = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p0 on RE(4, 2) are (-1, 1) respectively;

[0474] When k' = 0, l' = 1, k = 4n + 2k' + Δ = 4, By querying Table 1, we can obtain W f (k' + 2t) = -1, W t (l') = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p0 on RE(4, 3) are (-1, 1) respectively;

[0475] When k' = 1, l' = 0, k = 4n + 2k' + Δ = 6, By querying Table 1, we can obtain W f (k' + 2t) = -1, W t (l') = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p0 on RE(6, 2) are (-1, 1) respectively;

[0476] When k' = 1, l' = 1, k = 4n + 2k' + Δ = 6, By querying Table 1, we can obtain W f (k' + 2t) = -1, W t (l') = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p0 on RE(6, 3) are (-1, 1) respectively;

[0477] According to the OCC used by DMRS port p8 on the second group of subcarriers (subcarrier indices are 4 and 6) of CDM group 0 and the 4 REs corresponding to symbol 2 and symbol 3, a set of frequency-domain OCCs {-1, -1, -1, -1} can be obtained.

[0478] In the same way, the first set of OCCs used by the sequences of other DMRS ports in CDM group 0 on the first set of subcarriers (subcarrier indices are 0 and 2) and the 4 REs corresponding to symbol 2 and symbol 3, as well as the second set of OCCs used on the second set of subcarriers (subcarrier indices are 4 and 6) and the 4 REs corresponding to symbol 2 and symbol 3 can be obtained. Only the first set of OCCs used by DMRS port p8, DMRS port p9, DMRS port p12, and DMRS port p13 in CDM group 0 on the above 8 REs, and the second set of OCCs used on the second set of subcarriers and the 4 REs corresponding to symbol 2 and symbol 3 are listed here. For details, please refer to Figure 5 .

[0479] As Figure 5 shown, on the first set of subcarriers (subcarrier indices are 0, 2) corresponding to CDM group 0, the frequency-domain OCC of the first set of REs (2 REs in the frequency domain and 2 symbols in the time domain) corresponding to port p8 is {1, 1, 1, 1}. On the second set of subcarriers (subcarrier indices are 4, 6) corresponding to CDM group 0, the frequency-domain OCC of the second set of REs corresponding to port p8 is {-1, -1, -1, -1}. These two sets of OCCs are orthogonal.

[0480] On the first set of subcarriers (subcarrier indices are 0, 2) corresponding to CDM group 0, the frequency-domain OCC of the first set of REs corresponding to port p9 is {1, -1, 1, -1}. On the second set of subcarriers (subcarrier indices are 4, 6) corresponding to CDM group 0, the frequency-domain OCC of the second set of REs corresponding to port p9 is {-1, 1, -1, 1}. These two sets of OCCs are orthogonal.

[0481] On the first set of subcarriers (subcarrier indices are 0, 2) corresponding to CDM group 0, the frequency-domain OCC of the first set of REs corresponding to port p12 is {1, 1, -1, -1}. On the second set of subcarriers (subcarrier indices are 4, 6) corresponding to CDM group 0, the frequency-domain OCC of the second set of REs corresponding to port p12 is {-1, -1, 1, 1}. These two sets of OCCs are orthogonal.

[0482] On the first set of subcarriers (subcarrier indices are 0, 2) corresponding to CDM group 0, the frequency-domain OCC of the first set of REs corresponding to port p13 is {1, -1, -1, 1}. On the second set of subcarriers (subcarrier indices are 4, 6) corresponding to CDM group 0, the frequency-domain OCC of the second set of REs corresponding to port p13 is {-1, 1, 1, -1}. These two sets of OCCs are orthogonal.

[0483] In the embodiments of this application, the above-mentioned first set of subcarriers, the second set of subcarriers, and the 8 REs corresponding to 2 symbols are combined together for orthogonality. The frequency-domain OCC can be equivalently regarded as an OCC with a length of 8.

[0484] The sequence of DMRS ports {p0, p1, p4, p5} in CDM group 0 is the same as the OCC on the 8 REs corresponding to the above two sets of subcarriers and 2 symbols defined in the current standard. Thus, if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device do not include the ports {p8, p9, p12, p13}, there is no need to change the current DMRS sequence mapping method; if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device include at least one of the ports {p8, p9, p12, p13}, DMRS mapping is performed according to the above method provided in the embodiments of the present application to ensure the orthogonality of the signals of the newly added 4 DMRS ports and the original 4 DMRS ports.

[0485] In some other embodiments of the present application, a first configuration information table and a second configuration information table can be set for DMRS. The first configuration information table includes 8 DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. The second configuration information table includes another 8 DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. And in the second configuration information table, the frequency domain OCC in the OCC includes a first group of OCC and a second group of OCC. Among them, the first configuration information table can be as shown in Table 2, and the second configuration information table can be as shown in Table 3.

[0486] Table 2 exemplarily shows a first configuration information table of DMRS provided by the embodiments of the present application.

[0487] Table 2: DMRS Configuration Information Table 1 for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1)

[0488]

[0489] The parameter descriptions in Table 2 are basically the same as those in Table 1 and will not be repeated here.

[0490] Table 3 exemplarily shows a second configuration information table of DMRS provided by the embodiments of the present application.

[0491] Table 3: DMRS Configuration Information Table 2 for Type 1 DMRS

[0492] (Parameters for PUSCH DM-RS configuration type 1)

[0493]

[0494] The parameter descriptions in Table 3 are basically the same as those in Table 1 and will not be repeated here.

[0495] If the index of the DMRS port configured by the transmitting device for the receiving device is less than 8, the corresponding OCC is obtained according to Table 2 above, and the DMRS sequence is mapped to the corresponding time-frequency resources using the traditional DMRS mapping formula based on the obtained OCC.

[0496] Among them, the traditional DMRS mapping formula is:

[0497]

[0498] k = 4n + 2k'+ Δ

[0499] k' = 0, 1

[0500]

[0501] n = 0, 1,...

[0502] j = 0, 1,..., v - 1

[0503] The meanings of the parameters in the above formula are basically the same as those in Formula 4 and will not be repeated here.

[0504] If the index of the DMRS port configured by the transmitting device for the receiving device is greater than or equal to 8, the corresponding OCC is obtained according to Table 3 above, and the DMRS sequence is mapped to the corresponding time-frequency resources using the above Formula 4. The specific implementation method can refer to the relevant content of the foregoing embodiments.

[0505] In some embodiments of the present application, the transmitting device may also indicate the port index of the demodulation reference signal configured for the receiving device to the receiving device. Taking the downlink DMRS transmission as an example, specifically, the transmitting device may send the indication information of the DMRS port index to the terminal device through downlink control information (DCI).

[0506] In the embodiments of the present application, the correspondence table between the demodulation reference signal port index indication information and the demodulation reference signal port can be extended, and the corresponding reference signal port index indication information is set for the newly added demodulation reference signal ports in the embodiments of the present application.

[0507] Furthermore, in order to save signaling overhead, in the embodiments of the present application, joint encoding may be performed for multiple demodulation reference signal port indexes, so as to indicate multiple demodulation reference signal port indexes using less-bit indication information.

[0508] Taking DMRS as an example and adopting the first configuration type (Type 1 DMRS), the correspondence table between the DMRS port index indication information and the DMRS port index after the extension of the embodiments of the present application will be described.

[0509] Table 4 exemplarily shows a correspondence table between the DMRS port index indication information and the DMRS port index when rank = 1 provided by the embodiments of the present application. Among them, rand = 1 indicates that the number of transmission layers is 1, and the transmitting device configures 1 DMRS port for the receiving device. maxLength represents the maximum number of prefix symbols of DMRS.

[0510] Table 4: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 1)

[0511]

[0512] Table 4 shows the values of the port index indication information corresponding to the DMRS port indexes 0 to 15. Among them, 14 to 21 are the indication information newly added by the embodiments of the present application on the basis of the original indication information, respectively indicating the DMRS port indexes 8 to 15, and the indication information 22 to 31 is reserved. The length of the DMRS port index indication information can be 5 bits.

[0513] The present application does not exclude indicating the DMRS port index in other ways. For example, in some embodiments, the correspondence table between the original indication information for the DMRS port indexes 0 to 7 and the DMRS port index can be retained, and on this basis, a new correspondence table can be added to give the corresponding DMRS port index indication information for the DMRS port indexes 8 to 15. Specifically, it can be shown in Table 5. maxLength represents the maximum number of prefix symbols of DMRS, which represents the maximum number of prefix symbols of DMRS.

[0514] Table 5: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 1)

[0515]

[0516] Table 5 shows the values of the port index indication information corresponding to DMRS port indices 8 to 15. The length of the DMRS port index indication information can be 3 bits. Taking the following DMRS transmission as an example, when the index of the DMRS port configured by the network device for the terminal device is greater than 8, the corresponding DMRS port index indication information can be obtained according to Table 5, and this indication information is carried in the DCI and sent to the terminal device.

[0517] Table 6 exemplarily shows a correspondence table between the DMRS port index indication information and the DMRS port index when rank = 2 provided by an embodiment of the present application. Among them, rand = 2 means the number of transmission layers is 2, and the transmitting device configures 2 DMRS ports for the receiving device. maxLength represents the maximum number of DMRS prefix symbols.

[0518] Table 6: Correspondence Table between DMRS Port Index Indication Information and DMRS Port Index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 2)

[0519]

[0520] In Table 6, the indication information with values from 10 to 15 is the newly added indication information in the embodiment of the present application based on the original indication information, and is used to indicate the port combinations with port indices greater than or equal to 8. The length of the DMRS port index indication information can be 4 bits.

[0521] The DMRS port combinations shown in Table 6 are only one example, and other possible port combinations are not excluded. For example, the combination of DMRS port indices 8 and 13, the combination of DMRS port indices 10 and 15, etc.

[0522] The present application does not exclude using other methods to indicate the DMRS port index. For example, in some embodiments, the correspondence table between the DMRS port index indication information and the DMRS port index for the original DMRS port indices 0 to 7 can be retained, and on this basis, a new correspondence table is added to give the corresponding DMRS port index indication information for the DMRS port indices 8 to 15. Specifically, it can be as shown in Table 7. maxLength represents the maximum number of DMRS prefix symbols, indicating the maximum number of DMRS prefix symbols.

[0523] Table 7: Correspondence Table between DMRS Port Index Indication Information and DMRS Port Index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 2)

[0524]

[0525] For various port combinations of port indexes 8 to 15 in Table 7, the corresponding values of the DMRS port index indication information are given. Taking the following DMRS transmission as an example, the network device can use 3 bits in the DCI to indicate various combination forms of DMRS port indexes 0 to 15. In some cases, it can also only indicate some of the DMRS port indexes in the DCI. For example, when the DMRS port indexes configured by the current network device for the terminal are 0 to 3, 2-bit indication information can be used to indicate the DMRS port indexes configured for the terminal device.

[0526] Table 8 exemplarily shows a correspondence table between the DMRS port index indication information and the DMRS port index provided in an embodiment of the present application when rank = 3. Among them, rand = 3 indicates that the number of transmission layers is 3, and the sending device configures 3 DMRS ports for the receiving device. maxLength represents the maximum number of DMRS prefix symbols.

[0527] Table 8: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 3)

[0528]

[0529] In Table 8, the indication information with values from 3 to 4 is the newly added indication information in the embodiment of the present application based on the original indication information, and is used to indicate the port combinations with port indexes greater than or equal to 8. The length of the DMRS port index indication information can be 4 bits.

[0530] In some other embodiments, when rank = 3, other port combination methods can also be adopted, such as shown in Table 9. maxLength represents the maximum number of DMRS prefix symbols.

[0531] Table 9: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 3)

[0532]

[0533] This application does not rule out using other methods to indicate the DMRS port index. For example, in some embodiments, the original correspondence table between the DMRS port index indication information for DMRS port indices 0 to 7 and the DMRS port index can be retained, and on this basis, a new correspondence table can be added to give the corresponding DMRS port index indication information for DMRS port indices 8 to 15. Specifically, it can be as shown in Table 10. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0534] Table 10: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 3)

[0535]

[0536] Table 11 exemplarily shows a correspondence table between DMRS port index indication information and DMRS port index provided in an embodiment of this application when rank = 4. Among them, rand = 4 means the number of transmission layers is 4, and the transmitting device configures 4 DMRS ports for the receiving device. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0537] Table 11: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 4)

[0538]

[0539] The DMRS port index combination shown in Table 11 is only an example. In some other embodiments, when rank = 4, other DMRS port index combination methods can also be used.

[0540] In some embodiments, the original correspondence table between the DMRS port index indication information for DMRS port indices 0 to 7 and the DMRS port index can be retained, and on this basis, a new correspondence table can be added to give the corresponding DMRS port index indication information for DMRS port indices 8 to 15. Specifically, it can be as shown in Table 12. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0541] Table 12: Correspondence Table between DMRS Port Index Indication Information and DMRS Port Index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 4)

[0542]

[0543] See Figure 6 As shown, it is a flowchart of a signal transmission method implemented on the receiving device side provided by an embodiment of the present application. This method can be applied to Figure 1 the network architecture shown. Of course, it can also be applied to network architectures other than this. The present application does not make any limitations in this regard. When applying this method to Figure 1 the network architecture shown, for downlink demodulation reference signal transmission, the transmitting device involved in this method can be Figure 1 the network device 101 in Figure 1 , and the terminal device involved in this method can be the terminal devices (102a~102d) in Figure 1 ; for uplink demodulation reference signal transmission, the transmitting device involved in this method can be the terminal devices (102a~102d) in Figure 1 , and the receiving device involved in this method can be the network device 101 in

[0544] See Figure 6 As shown, this method may include the following processing procedures:

[0545] S601: The receiving device receives the demodulation reference signal sent by the transmitting device on the time-frequency resources of the demodulation reference signal.

[0546] Among them, for the relevant descriptions of the demodulation reference signal and the transmitting device sending the demodulation reference signal, reference can be made to the relevant content in Figure 3 .

[0547] S602: The receiving device obtains the sequence of the demodulation reference signal.

[0548] In some embodiments, a configuration information table of the demodulation reference signal is configured in the receiving device. Among them, for the relevant descriptions of the configuration information table, reference can be made to the relevant descriptions in the process involved in Figure 3 . The receiving device can process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain the sequence of the demodulation reference signal. Specifically, it may include the following steps:

[0549] Step 1: The receiving device obtains the CDM group frequency domain offset, frequency domain OCC, and time domain OCC corresponding to the first RE(k,l) according to the configuration information table of the demodulation reference signal, where the subcarrier index of the first RE(k,l) in the time-frequency resource is k and the symbol index is l;

[0550] Step 2: The receiving device obtains the data of the demodulation reference signal on the first RE(k,l) according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC The data mapped on the first RE(k,l) Satisfies the above formula (4).

[0551] In some embodiments, the receiving device receives the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device, so as to obtain the demodulation reference signal port index allocated by the sending device according to the indication information of the demodulation reference signal port index, and query the above configuration information table of the demodulation reference signal according to the demodulation reference signal port index and the belonging CDM group to obtain the OCC code, and then calculate the sequence of the demodulation reference signal based on the mapping formula of the demodulation reference signal.

[0552] According to the above embodiments of the present application, the number of orthogonal DMRS ports can be increased without additional DMRS overhead. In addition, existing receiving devices can be compatible, that is, the new receiving devices provided by the present application can be multi-user paired with receiving devices that only support existing standard capabilities, and existing receiving devices do not need to be updated in terms of hardware and software. The expansion of DMRS orthogonal ports can enable multi-user orthogonal pairing of more layers in the uplink or downlink, which is beneficial to improving the system capacity.

[0553] The embodiments of the present application also provide a signal transmission method and device for increasing the number of orthogonal demodulation reference signal ports that the system can support without additional demodulation reference signal overhead. Among them, the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving problems are similar, the implementation of the device and the method can be referred to each other, and the repeated parts will not be described again.

[0554] Refer to Figure 7 As shown, it is a flowchart of a signal transmission method implemented on the sending device side provided by the embodiments of the present application. This method can be applied to Figure 1 the network architecture shown, and of course it can also be applied to network architectures other than this. The present application does not make any limitations in this regard. When this method is applied to Figure 1 the network architecture shown, for downlink demodulation reference signal transmission, the sending device involved in this method can be Figure 1 the network device 101 in, and the receiving device involved in this method can be Figure 1The terminal devices (102a - 102d) in; for uplink demodulation reference signal transmission, the transmitting device involved in this method can be Figure 1 The terminal devices (102a - 102d) in, and the receiving device involved in this method can be Figure 1 The network device 101 in.

[0555] Refer to Figure 7 As shown, this method may include the following processing flow:

[0556] S701: The transmitting device generates a sequence of demodulation reference signals.

[0557] The demodulation reference signal is used to estimate the channel state of the first channel. Among them, the demodulation reference signal is used to estimate the channel state of the first channel, which can be understood as that the demodulation reference signal is the demodulation reference signal of the first channel. For downlink demodulation reference signal transmission, the first channel is used to carry uplink data; for uplink demodulation reference signal transmission, the first channel is used to carry downlink data.

[0558] Specifically, the demodulation reference signal can be the DMRS for downlink transmission, which is used for channel estimation of the PUSCH, or the demodulation reference signal can be the DMRS for uplink transmission, which is used for channel estimation of the PDSCH.

[0559] More specifically, this DMRS can be the DMRS based on the CP - OFDM waveform, the DMRS configuration type is the first configuration type (Type 1 DMRS), and the time - domain position of the DMRS is the previous one or two symbols within a time slot (i.e., Front - loaded DMRS).

[0560] The specific implementation method for the transmitting device to generate the demodulation reference signal sequence is basically the same as the relevant content in Figure 3 S301 above and will not be repeated here.

[0561] S702: The transmitting device maps the sequence of demodulation reference signals to the time - frequency resources of the demodulation reference signal and transmits it.

[0562] The time - frequency resources to which the sequence of demodulation reference signals is mapped include the frequency - domain resources corresponding to the first CDM group.

[0563] The frequency - domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals. Among them, the arrangement method of the frequency - domain resources corresponding to a CDM group can be referred to Figure 3 The relevant content in S302 above.

[0564] The time-domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols. The first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0565] Among them, in some embodiments, the first group of OCCs and the second group of OCCs are time-domain OCCs. In other embodiments, the first group of OCCs and the second group of OCCs are frequency-domain OCCs.

[0566] The demodulation reference signal type is associated with the time domain where the demodulation reference signal is located. Depending on the time-domain position of the demodulation reference signal, the demodulation reference signal can include two types: front-loaded demodulation reference signal and additional demodulation reference signal. Among them, the time-domain position of the front-loaded demodulation reference signal is the first few symbols within a time slot, such as the first 2 symbols in the first time slot of a subframe; the time-domain position of the additional demodulation reference signal is several symbols after the time-domain position of the front-loaded demodulation reference signal, such as 2 symbols in the second time slot of a subframe. The first group of symbols can include the symbols occupied by the front-loaded demodulation reference signal, and the second group of symbols can include the symbols occupied by the additional demodulation reference signal. For the convenience of description, in the embodiments of the present application, the front-loaded demodulation reference signal type is referred to as the first demodulation reference signal type, and the additional demodulation reference signal type is referred to as the second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0567] In some embodiments, the number of symbols included in the first group of symbols and the second group of symbols is the same. For example, the first group of symbols and the second group of symbols each include 2 consecutive symbols.

[0568] In some embodiments of the present application, the maximum number of demodulation reference signal ports included in the above first CDM group is at least 4N, where N is the number of symbols included in the first group of symbols or the second group of symbols. For example, if 2 front-loaded symbols are configured for the demodulation reference signal, then each CDM group can include at most 8 demodulation reference signal ports, and thus two CDM groups can support at most 16 demodulation reference signal ports.

[0569] According to the above embodiments, taking the DMRS with the configuration type of the first configuration type (Type 1 DMRS) as an example, and the front-loaded symbols of the DMRS are the two symbols in the first time slot and the additional symbols are the two symbols in the second time slot, then in some embodiments of the present application, the time-frequency resource position of the DMRS can be as Figure 8 shown.

[0570] As Figure 8As shown, when configuring 2 preamble symbols and 2 additional symbols, the first set of symbols corresponding to CDM group 0 includes symbols {2, 3, 8, 9}, where symbols {2, 3} form the first set of symbols and symbols {8, 9} form the second set of symbols. The first set of symbols corresponds to the first set of OCC, the second set of symbols corresponds to the second set of OCC, and the first set of OCC is orthogonal to the second set of OCC.

[0571] The symbols corresponding to CDM group 1 include symbols {2, 3, 8, 9}, where symbols {2, 3} form the first set of symbols and symbols {8, 9} form the second set of symbols. The first set of symbols corresponds to the first set of OCC, the second set of symbols corresponds to the second set of OCC, and the first set of OCC is orthogonal to the second set of OCC.

[0572] It should be noted that Figure 8 in, when configuring 2 preamble symbols and 2 additional symbols for DMRS transmission, only taking CDM group 0 including DMRS ports {p0, p1, p4, p5, p8, p9, p12, p13} and CDM group 1 including DMRS ports {p2, p3, p6, p7, p10, p11, p14, p15} as an example to describe. In some other embodiments, the port combinations included in CDM group 0 and CDM group 1 can also be other situations. For example, CDM group 0 includes DMRS ports {p0, p1, p4, p5, p10, p11, p14, p15}, and CDM group 1 includes DMRS ports {p2, p3, p6, p7, p8, p9, p12, p13}, which will not be listed one by one here.

[0573] It should also be noted that the symbol positions for transmitting DMRS are configurable and are not limited to Figure 7 the symbol positions shown. For example, the preamble symbols can be configured on the 1st and 2nd OFDM symbols.

[0574] It can be seen from the above embodiments that the embodiments of the present application do not additionally increase the time-frequency resource overhead of the demodulation reference signal. Instead, by dividing the symbols within the time-domain resources corresponding to a CDM group into a first set of symbols and a second set of symbols, and making the first set of symbols correspond to the first set of OCC, the second set of symbols correspond to the second set of OCC, and the first set of OCC and the second set of OCC are orthogonal, the number of mutually orthogonal demodulation reference signal ports within a CDM group can be increased, and thus the number of orthogonal demodulation reference signal ports that the system can support can be improved.

[0575] When the above embodiments of the present application are applied to DMRS with a configuration type of Type 1 DMRS, 16 DMRS ports can be supported to be orthogonal without increasing the DMRS overhead, realizing 16-layer orthogonal multi-user pairing, which is beneficial to reducing the inter-layer interference between DMRSs and obtaining more accurate channel estimation results. The above embodiments are applicable to scenarios where the channel time variation is relatively slow.

[0576] In the embodiments of the present application, after generating the demodulation reference signal sequence, the transmitting device can obtain the OCC by querying the configuration information table of the demodulation reference signal, and perform the mapping of the demodulation reference signal sequence to the time-frequency resources according to the OCC, that is, map the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal.

[0577] In some embodiments, the above first group of OCCs and the second group of OCCs are time-domain OCCs. The configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency-domain OCC and a time-domain OCC, the time-domain OCC includes a first group of OCCs and a second group of OCCs, and the DMRS types corresponding to the first group of OCCs and the second group of OCCs are different. Specifically, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. Among them, the demodulation reference signal type includes a preamble demodulation reference signal and an additional demodulation reference signal. The transmitting device can obtain the first group of OCCs corresponding to the first group of symbols and the second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type, and thus map the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal according to the obtained OCCs.

[0578] In other embodiments, the above first group of OCCs and the second group of OCCs are time-domain OCCs. The configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, and the demodulation reference signal types corresponding to the first configuration information table and the second configuration information table are different. Specifically, the first configuration information table corresponds to the first demodulation reference signal type, and the second configuration information table corresponds to the second demodulation reference signal type. Among them, the demodulation reference signal type includes a preamble demodulation reference signal type and an additional demodulation reference signal type. The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency-domain OCC and a time-domain OCC, and the time-domain OCC is the first group of OCCs. The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency-domain OCC and a time-domain OCC, and the time-domain OCC is the second group of OCCs.

[0579] In some embodiments of the present application, when the first group of OCCs and the second group of OCCs are time-domain OCCs, the transmitting device can map the demodulation reference signal sequence to the time-frequency resources of the demodulation reference signal according to the following formula:

[0580]

[0581] k = 4n + 2k′ + Δ

[0582] k′ = 0, 1

[0583] s = 0, 1

[0584]

[0585] n = 0, 1, …

[0586] j = 0, 1, …, v - 1

[0587] Wherein, represents the data of the sequence mapping of the demodulation reference signal on RE(k, l), where k is the subcarrier index and l is the symbol index; W f (k′) is the frequency-domain OCC, W t (l′, s) is the time-domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers. s is used to identify the DMRS type. When s = 0, it identifies the preamble DMRS, and the time-domain OCC is the first group of OCCs; when s = 1, it identifies the additional DMRS, and the time-domain OCC is the second group of OCCs.

[0588] In some embodiments, the first group of OCCs and the second group of OCCs are frequency-domain OCCs. The configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC. Among them, the OCC includes a frequency-domain OCC and a time-domain OCC. The frequency-domain OCC includes the first group of OCCs and the second group of OCCs. The demodulation reference signal types corresponding to the first group of OCCs and the second group of OCCs are different. Specifically, the first group of OCCs corresponds to the first demodulation reference signal type, and the second group of OCCs corresponds to the second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. Among them, the demodulation reference signal type includes a pre-demodulation reference signal and an additional demodulation reference signal. The transmitting device can obtain the first group of OCCs corresponding to the first group of symbols and the second group of OCCs corresponding to the second group of symbols according to this configuration information table and the demodulation reference signal type, and thus map the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal according to the obtained OCCs.

[0589] In some other embodiments, the first group of OCCs and the second group of OCCs are time-domain OCCs. The configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The demodulation reference signal types corresponding to the first configuration information table and the second configuration information table are different. The first configuration information table corresponds to the first demodulation reference signal type, and the second configuration information table corresponds to the second demodulation reference signal type. Among them, the demodulation reference signal type includes a pre-demodulation reference signal and an additional demodulation reference signal. The first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC. The OCC includes a frequency-domain OCC and a time-domain OCC, and the frequency-domain OCC is the first group of OCCs. The second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC. The OCC includes a frequency-domain OCC and a time-domain OCC, and the frequency-domain OCC is the second group of OCCs.

[0590] In some embodiments of the present application, when the first group of OCCs and the second group of OCCs are frequency-domain OCCs, the transmitting device can map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

[0591]

[0592] k = 4n + 2k' + Δ

[0593] k' = 0, 1

[0594] s = 0, 1

[0595]

[0596] n = 0, 1, …

[0597] j = 0, 1, …, v - 1

[0598] Wherein, represents the data where the sequence of the demodulation reference signal is mapped on RE(k, l), where k is the sub - carrier index and l is the symbol index; W f (k′) is the frequency - domain OCC, W t (l′, s) is the time - domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM - group frequency - domain offset; is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, and v is the number of transmission layers. s is used to identify the DMRS type. When s = 0, it identifies the pre - fixed DMRS and the frequency - domain OCC is the first group of OCC; when s = 1, it identifies the additional DMRS and the frequency - domain OCC is the second group of OCC.

[0599] In some embodiments, based on the above formula (6) or formula (7), the process by which the transmitting device maps the sequence of the demodulation reference signal to the time - frequency resources of the demodulation reference signal may include the following steps:

[0600] Step 1: The transmitting device obtains the CDM - group frequency - domain offset, frequency - domain OCC, and time - domain OCC corresponding to RE(k, l) according to the configuration information table of the demodulation reference signal;

[0601] Step 2: The transmitting device obtains the data where the sequence of the demodulation reference signal is mapped on RE(k, l) according to the obtained CDM - group frequency - domain offset, frequency - domain OCC, and time - domain OCC wherein, the data mapped on RE(k, l) satisfies the above formula (6) or formula (7), that is, the transmitting device can perform processing using formula (6) or formula (7) based on the obtained CDM - group frequency - domain offset, frequency - domain OCC, and time - domain OCC, so as to obtain the data where the sequence of the demodulation reference signal is mapped on RE(k, l)

[0602] Next, in combination with formula (6) that the above mapping process needs to satisfy, and respectively in combination with the above two different setting methods of the configuration information table of the demodulation reference signal, taking the DMRS with the configuration type of the first configuration type (Type 1 DMRS) as an example, the implementation process of the embodiments of the present application is described.

[0603] In some embodiments of the present application, a configuration information table can be set for DMRS, which includes 16 DMRS port indexes, as well as the CDM group frequency domain offset and OCC corresponding to each DMRS port index. Among them, the time domain OCC includes a first group of OCC and a second group of OCC. The first group of OCC corresponds to the first group of symbols and is used for the preamble DMRS. The second group of OCC corresponds to the second group of symbols and is used for the additional DMRS. Specifically, it can be shown in Table 13 as follows.

[0604] Table 13 exemplarily shows a configuration information table of DMRS provided by an embodiment of the present application.

[0605] Table 13: DMRS Configuration Information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1 for DMRS)

[0606]

[0607] In Table 13, represents the DMRS port index, λ represents the CDM group index, Δ represents the CDM group frequency domain offset (the CDM group frequency domain offset takes values of 0 and 1), W f (k′) is the frequency domain OCC, and W t (l′, s) is the time domain OCC. The time domain OCC includes two groups. Among them, the group of OCC corresponding to s = 0 is the first group of OCC, and the group of OCC corresponding to s = 1 is the second group of OCC.

[0608] In Table 13, the DMRS ports with port indexes from 8 to 15 are the newly added ports in the present application embodiment based on the existing ports. Although the OCC corresponding to the DMRS ports with port indexes from 0 to 7 has also been expanded, the expanded time domain OCC (the 2 columns of time domain OCC corresponding to s = 1) are the same as the original time domain OCC (the 2 columns of time domain OCC corresponding to s = 0), so that the OCC corresponding to the DMRS ports with port indexes from 0 to 7 in Table 13 is the same as the OCC corresponding to the DMRS ports in the original DMRS configuration information table.

[0609] Taking the configuration of 2 symbols as an example, if the transmitting device configures the DMRS ports {p0, p1, p4, p5, p10, p11, p14, p15} in CDM group 0 for the receiving device, after generating the DMRS sequence, the transmitting device can query Table 13 according to the DMRS port index to obtain the corresponding OCC, and map the DMRS sequence to the corresponding time-frequency resources according to the obtained OCC using the above formula (6).

[0610] Taking Figure 7Taking the time-frequency resources shown as an example, the sequences of each DMRS port in CDM group 0 can be mapped to Figure 7 the REs filled with diagonal lines in

[0611] Taking the sequence of DMRS port p8 as an example, and the initial symbol index of DMRS is 2, l′ = 0, 1. The preamble DMRS is transmitted on symbols 2 and 3, and the additional DMRS is transmitted on symbols 8 and 9.

[0612] When s = 0, the mapping of the preamble DMRS of DMRS port p8 is as follows:

[0613] When k′ = 0, l′ = 0, k = 4n + 2k′ + Δ = 0, By querying Table 13, W f (k′) = 1, W t (l′, s) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(0, 2) are (1, 1) respectively;

[0614] When k′ = 0, l′ = 1, k = 4n + 2k′ + Δ = 0, By querying Table 13, W f (k′) = 1, W t (l′, s) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(0, 3) are (1, 1) respectively;

[0615] When k′ = 1, l′ = 0, k = 4n + 2k′ + Δ = 2, By querying Table 13, W f (k′) = 1, W t (l′, s) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(2, 2) are (1, 1) respectively;

[0616] When k′ = 1, l′ = 1, k = 4n + 2k′ + Δ = 2, By querying Table 13, W f (k′) = 1, W t (l′, s) = 1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(2, 3) are (1, 1) respectively;

[0617] According to the OCCs used by DMRS port p8 in the first group of symbols (symbols 2 and 3) of CDM group 0 and the 4 REs corresponding to subcarrier 0 and subcarrier 2, a set of time-domain OCCs {1, 1, 1, 1} can be obtained.

[0618] When s = 1, the mapping of the additional DMRS of DMRS port p8 is as follows:

[0619] When k′ = 0 and l′ = 0, k = 4n + 2k′ + Δ = 0, W f (k′) can be obtained by querying Table 13 as 1, and W t (l′, s) = -1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(0, 2) are (1, 1) respectively;

[0620] When k′ = 0 and l′ = 1, k = 4n + 2k′ + Δ = 0, W f (k′) can be obtained by querying Table 13 as 1, and W t (l′, s) = -1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(0, 3) are (1, 1) respectively;

[0621] When k′ = 1 and l′ = 0, k = 4n + 2k′ + Δ = 2, W f (k′) can be obtained by querying Table 13 as 1, and W t (l′, s) = -1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(2, 2) are (1, 1) respectively;

[0622] When k′ = 1 and l′ = 1, k = 4n + 2k′ + Δ = 2, W f (k′) can be obtained by querying Table 13 as 1, and W t (l′, s) = -1, that is, the frequency-domain OCC and time-domain OCC of the sequence of DMRS port p8 on RE(2, 3) are (1, 1) respectively;

[0623] According to the OCC used by the second group of symbols (symbols 8 and 9) of DMRS port p8 in CDM group 0 and the 4 REs corresponding to subcarrier 0 and subcarrier 2, a set of time-domain OCC {-1, -1, -1, -1} can be obtained.

[0624] In the same way, the first group of OCC used by the sequences of other DMRS ports in CDM group 0 on the first group of symbols (symbols 2, 3) and the 4 REs corresponding to subcarrier 0 and subcarrier 2, and the second group of OCC used on the second group of symbols (symbols 8, 9) and the 4 REs corresponding to subcarrier 0 and subcarrier 2 can be obtained. Here, only the first group of OCC and the second group of OCC used by DMRS port p8, DMRS port p9, DMRS port p12, and DMRS port p13 in CDM group 0 on the above 8 REs are listed. For details, please refer toFigure 9 。

[0625] As Figure 9 shown, on the first group of symbols (symbols 2, 3) corresponding to CDM group 0, the time-domain OCC of the first group of REs (2 REs in the frequency domain and 2 symbols in the time domain) corresponding to port p8 is {1, 1, 1, 1}. On the second group of symbols (symbols 8, 9) corresponding to CDM group 0, the time-domain OCC of the second group of REs corresponding to port p8 is {-1, -1, -1, -1}. These two groups of OCCs are orthogonal.

[0626] On the first group of symbols (symbols 2, 3) corresponding to CDM group 0, the time-domain OCC of the first group of REs corresponding to port p9 is {1, -1, 1, -1}. On the second group of symbols (symbols 8, 9) corresponding to CDM group 0, the time-domain OCC of the second group of REs corresponding to port p9 is {-1, 1, -1, 1}. These two groups of OCCs are orthogonal.

[0627] On the first group of symbols (symbols 2, 3) corresponding to CDM group 0, the time-domain OCC of the first group of REs corresponding to port p12 is {1, 1, -1, -1}. On the second group of symbols (symbols 8, 9) corresponding to CDM group 0, the time-domain OCC of the second group of REs corresponding to port p12 is {-1, -1, 1, 1}. These two groups of OCCs are orthogonal.

[0628] On the first group of symbols (symbols 2, 3) corresponding to CDM group 0, the time-domain OCC of the first group of REs corresponding to port p13 is {1, -1, -1, 1}. On the second group of symbols (symbols 8, 9) corresponding to CDM group 0, the time-domain OCC of the second group of REs corresponding to port p13 is {-1, 1, 1, -1}. These two groups of OCCs are orthogonal.

[0629] In the embodiment of the present application, the above first group of symbols, second group of symbols, and the 8 REs corresponding to 2 subcarriers are combined for orthogonality, and the time-domain OCC can be equivalent to an OCC with a length of 8.

[0630] The sequences of the DMRS ports {p0, p1, p4, p5} in CDM group 0 are consistent with those defined in the current standard on the 8 REs corresponding to the above two groups of symbols and 2 subcarriers. In this way, if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device do not include the ports {p8, p9, p12, p13}, then there is no need to change the current DMRS sequence mapping method; if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device include at least one of the ports {p8, p9, p12, p13}, then perform DMRS mapping according to the above method provided by the embodiment of the present application to ensure that the signals of the newly added 4 DMRS ports are orthogonal to those of the original 4 DMRS ports.

[0631] In some other embodiments of the present application, a first configuration information table and a second configuration information table may be set for DMRS. The DMRS type corresponding to the first configuration table is the front-loaded DMRS, and the DMRS type corresponding to the second configuration information table is the additional DMRS. For the front-loaded DMRS, the first configuration information table is used for DMRS sequence mapping, and for the additional DMRS, the second configuration information table is used for DMRS sequence mapping. The first configuration information table includes 16 DMRS port indexes, and the CDM group frequency domain offset, frequency domain OCC, and time domain OCC corresponding to each DMRS port index. The time domain OCC is the first group of OCC. The second configuration information table includes 16 DMRS port indexes, and the CDM group frequency domain offset, time domain OCC, and frequency domain OCC corresponding to each DMRS port index. The time domain OCC is the second group of OCC. Among them, the first configuration information table can be as shown in Table 14, and the second configuration information table can be as shown in Table 15.

[0632] Table 14 exemplarily shows a first configuration information table of DMRS provided by an embodiment of the present application.

[0633] Table 14: Parameters for PUSCH DM-RS configuration type 1 for front-loaded DMRS

[0634]

[0635] The parameter descriptions in Table 14 are basically the same as those in Table 13 and will not be repeated here.

[0636] Table 15 exemplarily shows a second configuration information table of additional DMRS provided by an embodiment of the present application.

[0637] Table 15: Parameters for PUSCH DM-RS configuration type 1 for additional DMRS

[0638]

[0639] The parameter descriptions in Table 15 are basically the same as those in Table 13 and will not be repeated here.

[0640] If the transmitting device configures the preamble DMRS and the additional DMRS for the receiving device, when mapping the DMRS sequence to the first set of symbols corresponding to the preamble DMRS, obtain the corresponding OCC according to Table 14 above, and map the DMRS sequence to the corresponding time-frequency resources by using the traditional DMRS mapping formula (such as Formula 5) according to the obtained OCC; when mapping the DMRS sequence to the second set of symbols corresponding to the additional DMRS, obtain the corresponding OCC according to Table 15 above, and map the DMRS sequence to the corresponding time-frequency resources by using the traditional DMRS mapping formula according to the obtained OCC. For the specific implementation method, reference may be made to the relevant content of the foregoing embodiments.

[0641] In some embodiments of the present application, a configuration information table for DMRS may be set up, which includes 16 DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. Among them, the frequency domain OCC includes a first group of OCC and a second group of OCC. The first group of OCC corresponds to the first set of symbols and is used for the preamble DMRS, and the second group of OCC corresponds to the second set of symbols and is used for the additional DMRS. Specifically, it can be shown in Table 16.

[0642] Table 16 exemplarily shows a configuration information table of DMRS provided by the embodiments of the present application.

[0643] Table 16: DMRS Configuration Information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1 for DMRS)

[0644]

[0645] In Table 16, represents the DMRS port index, λ represents the CDM group index, Δ represents the CDM group frequency domain offset (the CDM group frequency domain offset takes values of 0 and 1), W f (k′, s) is the frequency domain OCC, W t (l′) is the time domain OCC. The frequency domain OCC includes two groups. Among them, the group of OCC corresponding to s = 0 is the first group of OCC, and the group of OCC corresponding to s = 1 is the second group of OCC.

[0646] In Table 16, the DMRS ports with port indices from 8 to 15 are the newly added ports in the embodiments of the present application based on the existing ports. Although the OCCs corresponding to the DMRS ports with port indices from 0 to 7 are also expanded, the expanded frequency-domain OCCs (the 2 columns of frequency-domain OCCs corresponding to s = 1) are the same as the original frequency-domain OCCs (the 2 columns of frequency-domain OCCs corresponding to s = 0), so that the OCCs corresponding to the DMRS ports with port indices from 0 to 7 in Table 16 are the same as the OCCs corresponding to the DMRS ports in the original DMRS configuration information table.

[0647] Taking the configuration of 2 symbols as an example, if the transmitting device configures the DMRS ports {p0, p1, p4, p5, p10, p11, p14, p15} in CDM group 0 for the receiving device, after generating the DMRS sequence, the transmitting device can query Table 16 above according to the DMRS port index to obtain the corresponding OCC, and map the DMRS sequence to the corresponding time-frequency resources using the above formula (7) according to the obtained OCC.

[0648] Taking the configuration of 2 symbols as an example, if the transmitting device configures the DMRS ports {p0, p1, p4, p5, p10, p11, p14, p15} in CDM group 0 for the receiving device, after generating the DMRS sequence, the transmitting device can query Table 16 above according to the DMRS port index to obtain the corresponding OCC, and map the DMRS sequence to the corresponding time-frequency resources using the above formula (7) according to the obtained OCC.

[0649] Taking Figure 7 the shown time-frequency resources as an example, the sequences of each DMRS port in CDM group 0 can be mapped to Figure 7 the REs filled with slashes in. The first set of OCCs used by the sequences of the DMRS ports in CDM group 0 on the first set of symbols (symbols 2, 3) and the 4 REs corresponding to subcarrier 0 and subcarrier 2, and the second set of OCCs used on the second set of symbols (symbols 8, 9) and the 4 REs corresponding to subcarrier 0 and subcarrier 2. Only the first set of OCCs and the second set of OCCs used by the DMRS port p8, DMRS port p9, DMRS port p12, and DMRS port p13 in CDM group 0 on the above 8 REs are listed here. For details, please refer to Figure 8 .

[0650] In the embodiments of the present application, the above first set of symbols, the second set of symbols, and the 8 REs corresponding to the 2 subcarriers are orthogonally combined, and the time-domain OCC can be equivalently regarded as an OCC with a length of 8.

[0651] The sequence of DMRS ports {p0, p1, p4, p5} in CDM group 0 is the same as the OCC on the 8 REs corresponding to the above two sets of symbols and 2 subcarriers defined in the current standard. Thus, if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device do not include ports {p8, p9, p12, p13}, there is no need to change the current DMRS sequence mapping method; if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device include at least one of the ports {p8, p9, p12, p13}, DMRS mapping is performed according to the above method provided in the embodiments of the present application to ensure that the signals of the newly added 4 DMRS ports are orthogonal to those of the original 4 DMRS ports.

[0652] In some other embodiments of the present application, a first configuration information table and a second configuration information table can be set for DMRS. The DMRS type corresponding to the first configuration table is the front-loaded DMRS, and the DMRS type corresponding to the second configuration information table is the additional DMRS. For the front-loaded DMRS, the first configuration information table is used for DMRS sequence mapping, and for the additional DMRS, the second configuration information table is used for DMRS sequence mapping. The first configuration information table includes 16 DMRS port indexes, and the CDM group frequency domain offset, frequency domain OCC, and time domain OCC corresponding to each DMRS port index. The frequency domain OCC is the first set of OCC. The second configuration information table includes 16 DMRS port indexes, and the CDM group frequency domain offset, frequency domain OCC, and time domain OCC corresponding to each DMRS port index. The frequency domain OCC is the second set of OCC. Among them, the first configuration information table can be as shown in Table 17, and the second configuration information table can be as shown in Table 18.

[0653] Table 17 exemplarily shows a first configuration information table of DMRS provided by the embodiments of the present application.

[0654] Table 17: Configuration information for front-loaded DMRS of Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1 for front-loaded DMRS)

[0655]

[0656] The parameter descriptions in Table 17 are basically the same as those in Table 16 and will not be repeated here.

[0657] Table 18 exemplarily shows a second configuration information table of additional DMRS provided by the embodiments of the present application.

[0658] Table 18: Additional DMRS configuration information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1 for additional DMRS)

[0659]

[0660] The parameter descriptions in Table 18 are basically the same as those in Table 16 and will not be repeated here.

[0661] If the transmitting device configures the front-loaded DMRS and additional DMRS for the receiving device, when mapping the DMRS sequence to the first set of symbols corresponding to the front-loaded DMRS, the corresponding OCC is obtained according to Table 17 above, and the DMRS sequence is mapped to the corresponding time-frequency resources by using the traditional DMRS mapping formula (such as Formula 5) according to the obtained OCC; when mapping the DMRS sequence to the second set of symbols corresponding to the additional DMRS, the corresponding OCC is obtained according to Table 18 above, and the DMRS sequence is mapped to the corresponding time-frequency resources by using the traditional DMRS mapping formula according to the obtained OCC. The specific implementation manner can refer to the relevant content of the foregoing embodiments.

[0662] In some embodiments of the present application, the transmitting device may also indicate the port index of the demodulation reference signal configured for the receiving device to the receiving device. Specifically, taking the downlink DMRS transmission as an example, the network device may send the indication information of the demodulation reference signal port index to the terminal device through DCI. The specific implementation manner can be referred to the foregoing embodiments.

[0663] Refer to Figure 10 shown, which is a flowchart of a signal transmission method implemented on the receiving device side provided by an embodiment of the present application. This method can be applied to Figure 1 the network architecture shown. Of course, it can also be applied to network architectures other than this. The present application does not make any limitations in this regard. When applying this method to Figure 1 the network architecture shown, for the downlink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 the network device 101 in, and the receiving device involved in this method may be Figure 1 the terminal devices (102a to 102d) in; for the uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 the terminal devices (102a to 102d) in, and the receiving device involved in this method may be Figure 1 the network device 101 in.

[0664] Refer to Figure 10 shown, this method may include the following processing procedures:

[0665] S1001: The receiving device receives the demodulation reference signal sent by the transmitting device on the time-frequency resources of the demodulation reference signal.

[0666] For the relevant descriptions of the demodulation reference signal and the transmitting device sending the demodulation reference signal, please refer to Figure 7 the relevant content in

[0667] S1002: The receiving device obtains the sequence of the demodulation reference signal.

[0668] In some embodiments, a configuration information table of the demodulation reference signal is configured in the receiving device. For the relevant descriptions of the configuration information table, please refer to Figure 7 the relevant descriptions in the process involved. The receiving device can process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain the sequence of the demodulation reference signal. Specifically, it may include the following steps:

[0669] Step 1: The receiving device obtains the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE(k,l) according to the configuration information table of the demodulation reference signal, where the subcarrier index of the first RE(k,l) in the time-frequency resources is k and the symbol index is l;

[0670] Step 2: The receiving device obtains the data of the demodulation reference signal on the first RE(k,l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE(k,l) satisfies the above formula (6) or formula (7).

[0671] In some embodiments, the receiving device receives the indication information of the demodulation reference signal port index in the first CDM group sent by the transmitting device, and thus obtains the demodulation reference signal port index allocated by the transmitting device according to the indication information of the demodulation reference signal port index, and queries the above configuration information table of the demodulation reference signal according to the demodulation reference signal port index and the belonging CDM group to obtain the OCC code, and then calculates the sequence of the demodulation reference signal based on the mapping formula of the demodulation reference signal.

[0672] According to the above embodiments of the present application, the number of orthogonal DMRS ports can be increased without additional DMRS overhead. In addition, it can be compatible with existing receiving devices, that is, the new receiving device provided by the present application can be multi-user paired with the receiving device that only supports the existing standard capabilities, and the existing receiving device does not need to be updated in terms of hardware and software. The expansion of the DMRS orthogonal ports can enable multi-user orthogonal pairing of more layers in the uplink or downlink, which is beneficial to improving the system capacity.

[0673] The embodiments of the present application also provide a signal transmission method and apparatus, which are used to increase the number of orthogonal demodulation reference signal ports supported by the system without additional overhead of demodulation reference signals. Among them, the method and the apparatus are based on the same inventive concept. Since the principles of the method and the apparatus for solving problems are similar, the implementation of the apparatus and the method can be referred to each other, and the repeated parts will not be elaborated.

[0674] Refer to Figure 11 , which is a flowchart of a signal transmission method implemented on the sending device side provided by the embodiments of the present application. This method can be applied to Figure 1 the network architecture shown in Figure 1 . Of course, it can also be applied to network architectures other than this. The present application does not make any limitations in this regard. When this method is applied to Figure 1 the network architecture shown in Figure 1 , for downlink demodulation reference signal transmission, the sending device involved in this method can be Figure 1 the network device 101 in Figure 1 , and the receiving device involved in this method can be

[0675] Refer to Figure 11 shown in

[0676] S1101: The sending device generates a sequence of demodulation reference signals.

[0677] The demodulation reference signal is used to estimate the channel state of the first channel. Among them, the demodulation reference signal is used to estimate the channel state of the first channel, which can be understood as that the demodulation reference signal is the demodulation reference signal of the first channel. For downlink demodulation reference signal transmission, the first channel is used to carry uplink data; for uplink demodulation reference signal transmission, the first channel is used to carry downlink data.

[0678] Specifically, the demodulation reference signal can be the DMRS for downlink transmission, which is used for channel estimation of the PUSCH, or the demodulation reference signal can be the DMRS for uplink transmission, which is used for channel estimation of the PDSCH.

[0679] More specifically, the DMRS may be a DMRS based on DFT-S-OFDM waveform and CP-OFDM waveform. If the DFT-S-OFDM waveform is used, the DMRS is generated based on the ZC (Zadoff-Chu) sequence; if the CP-OFDM waveform is used, the DMRS is generated based on the gold sequence. Among them, for the method of generating the DMRS sequence based on the gold sequence, reference can be made to the foregoing embodiments, and the embodiments of the present application do not limit the manner of generating the DMRS sequence based on the gold sequence.

[0680] Taking the DMRS based on the DFT-S-OFDM waveform as an example, the DMRS sequence can be generated by cyclic shifting of the ZC sequence.

[0681] Specifically, the DMRS sequence can be generated by using the following formula:

[0682]

[0683] Among them, n is the index of each element in the sequence, is the total length of the sequence, u = {0, 1,..., 29} is the sequence group index, v is the base sequence number in a certain sequence group, m is the number of RBs allocated by the transmitting device for the receiving device, is the number of subcarriers included in one RB. For PUSCH transmission, δ = 1 and α = 0. In addition, is defined as:

[0684]

[0685] Among them,

[0686] N ZC takes the value of the largest prime number less than M ZC For the sequence group index u, its value is:

[0687]

[0688] Among them, f gh indicates whether sequence hopping is performed, the value of

[0689] is limited to the following two cases: Case 1 When the high layer configures the nPUSCH-Identity parameter, and the uplink grant information is neither a Random access response (RAR) grant nor a DCI format 0_0 scrambled with TC-RNTI, then

[0690] Case 2: That is, it is equal to the cell ID.

[0691] Since different cells and different receiving devices can be configured with different the sequences generated by different cells have a certain degree of randomness.

[0692] S1102: The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal and transmits it.

[0693] The time-frequency resource to which the sequence of the demodulation reference signal is mapped may include the time-frequency resources corresponding to two CDM groups. Among them, the time-frequency resource corresponding to the first CDM group includes the frequency-domain resources corresponding to the first port and the second port of the demodulation reference signal in the first CDM group. The frequency-domain resources corresponding to the first port are the same as the frequency-domain resources corresponding to the second port, and the frequency-domain resources corresponding to the first port and the second port are discontinuous and arranged at equal intervals.

[0694] In some embodiments, the frequency-domain resources corresponding to one CDM group can be divided into subcarrier groups, and each subcarrier group may include 2 subcarriers. For example, the frequency-domain resources corresponding to one CDM group, in ascending or descending order of subcarrier index, include: the first subcarrier, the second subcarrier, the third subcarrier, the fourth subcarrier,... and so on. Then, the first subcarrier and the second subcarrier are divided into one subcarrier group, and the third subcarrier and the fourth subcarrier are divided into one subcarrier group. Among them, one PRB (such as the first PRB) in the frequency-domain resources corresponding to the first port and the second port includes the first subcarrier group and the second subcarrier group, or includes the first subcarrier group, the second subcarrier group, and the third subcarrier group.

[0695] For example, taking the DMRS with the configuration type of the first configuration type (Type 1 DMRS) as an example, and the time-domain position of the DMRS is the previous one or two symbols within a time slot (i.e., Front-loaded DMRS), then in some embodiments of the present application, in one PRB, the time-frequency resource position of the DMRS and the subcarrier group division situation may be as Figure 4 shown.

[0696] Such as Figure 4As shown, when configuring 1 symbol or 2 symbols, the frequency-domain resources corresponding to CDM group 0 include subcarriers {0, 2, 4, 6, 8, 10}, where subcarriers {0, 2} form the first subcarrier group, subcarriers {4, 6} form the second subcarrier group, and subcarriers {8, 10} form the third subcarrier group. The frequency-domain resources corresponding to CDM group 1 include subcarriers {1, 3, 5, 7, 9, 11}, where subcarriers {1, 3} form the first subcarrier group, subcarriers {5, 7} form the second subcarrier group, and subcarriers {9, 11} form the third subcarrier group. When configuring 1 symbol, CDM group 0 includes ports {p0, p1, p4, p5}, and CDM group 1 includes ports {p2, p3, p6, p7}; when configuring 2 symbols, CDM group 0 includes ports {p0, p1, p4, p5, p8, p9, p12, p13}, and CDM group 1 includes ports {p2, p3, p6, p7, p10, p11, p14, p15}.

[0697] The OCC codes used for the frequency-domain resources corresponding to one port on the REs corresponding to multiple subcarriers can form an OCC code sequence. In the embodiments of the present application, the sequence formed by the OCC codes used for the frequency-domain resources corresponding to the second port on the REs corresponding to all subcarriers in the above at least two subcarrier groups is obtained by performing a cyclic shift on the sequence formed by the OCC codes used for the frequency-domain resources corresponding to the first port on the REs corresponding to all subcarriers in the above at least two subcarrier groups, and the sequences formed by the OCC codes used for the frequency-domain resources corresponding to the same port (such as the first port or the second port) on the REs corresponding to different subcarrier groups are different from each other.

[0698] Specifically, in some embodiments, the OCC codes used for the frequency-domain resources corresponding to the first port on the REs corresponding to all subcarriers in the first subcarrier group and the second subcarrier group form a first OCC code sequence, and the OCC codes used for the frequency-domain resources corresponding to the second port on the REs corresponding to all subcarriers in the first subcarrier group and the second subcarrier group form a second OCC code sequence; the OCC codes used for the frequency-domain resources corresponding to the first port or the second port on the REs corresponding to two subcarriers in the first subcarrier group form a third OCC code sequence, and the OCC codes used for the frequency-domain resources corresponding to the first port or the second port on the REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence. Among them, the second OCC code sequence is obtained by performing a cyclic shift based on the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0699] For example, taking Figure 4 the subcarrier group division shown as an example, the OCC codes used for the frequency-domain resources corresponding to the first port (p0) and the second port (p8) in CDM group 0 on the corresponding REs are as follows:[

[0700] For the frequency-domain resources corresponding to the first port (p0), OCC1 is used on the RE corresponding to the first sub-carrier 0 in the first sub-carrier group;

[0701] For the frequency-domain resources corresponding to the first port (p0), OCC2 is used on the RE corresponding to the second sub-carrier 2 in the first sub-carrier group;

[0702] For the frequency-domain resources corresponding to the first port (p0), OCC3 is used on the RE corresponding to the first sub-carrier 4 in the second sub-carrier group;

[0703] For the frequency-domain resources corresponding to the first port (p0), OCC4 is used on the RE corresponding to the second sub-carrier 6 in the second sub-carrier group;

[0704] For the frequency-domain resources corresponding to the second port (p8), OCC5 is used on the RE corresponding to the first sub-carrier 0 in the first sub-carrier group;

[0705] For the frequency-domain resources corresponding to the second port (p8), OCC6 is used on the RE corresponding to the second sub-carrier 2 in the first sub-carrier group;

[0706] For the frequency-domain resources corresponding to the second port (p8), OCC7 is used on the RE corresponding to the first sub-carrier 4 in the second sub-carrier group;

[0707] For the frequency-domain resources corresponding to the second port (p8), OCC8 is used on the RE corresponding to the second sub-carrier 6 in the second sub-carrier group.

[0708] Among them, OCC1 to OCC4 form a first OCC sequence with a length of 4, and OCC5 to OCC8 form a second OCC code sequence with a length of 4. The second OCC code sequence is obtained by circularly shifting the first OCC code sequence. OCC1 and OCC2 form a third OCC code sequence, and OCC3 and OCC4 form a fourth OCC code sequence. The third OCC code sequence and the fourth OCC code sequence are different. It is also possible to refer to the sequence formed by OCC5 and OCC6 as the third OCC code sequence, and the sequence formed by OCC7 and OCC8 as the fourth OCC code sequence. In this case, the third OCC code sequence and the fourth OCC code sequence are different.

[0709] In some other embodiments, the OCC codes used for the REs corresponding to all subcarriers in the first subcarrier group, the second subcarrier group, and the third subcarrier group of the frequency-domain resources corresponding to the first port form a first OCC code sequence, and the OCC codes used for the REs corresponding to all subcarriers in the first subcarrier group, the second subcarrier group, and the third subcarrier group of the frequency-domain resources corresponding to the second port form a second OCC code sequence; the OCC codes used for the REs corresponding to two subcarriers in the first subcarrier group of the frequency-domain resources corresponding to the first port or the second port form a third OCC code sequence, the OCC codes used for the REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence, and the OCC codes used for the REs corresponding to two carriers in the third subcarrier group form a fifth OCC code sequence. Among them, the second OCC code sequence is obtained by circularly shifting the first OCC code sequence, and any two of the third OCC code sequence, the fourth OCC code sequence, and the fifth OCC code sequence are different from each other.

[0710] For example, taking Figure 4 the subcarrier group division shown as an example, the OCC codes used for the frequency-domain resources corresponding to the first port (p0) and the second port (p8) in CDM group 0 on the corresponding REs are as follows:

[0711] For the frequency-domain resources corresponding to the first port (p0), OCC1 is used for the RE corresponding to the first subcarrier 0 in the first subcarrier group;

[0712] For the frequency-domain resources corresponding to the first port (p0), OCC2 is used for the RE corresponding to the second subcarrier 2 in the first subcarrier group;

[0713] For the frequency-domain resources corresponding to the first port (p0), OCC3 is used for the RE corresponding to the first subcarrier 4 in the second subcarrier group;

[0714] For the frequency-domain resources corresponding to the first port (p0), OCC4 is used for the RE corresponding to the second subcarrier 6 in the second subcarrier group;

[0715] For the frequency-domain resources corresponding to the first port (p0), OCC5 is used for the RE corresponding to the first subcarrier 8 in the third subcarrier group;

[0716] For the frequency-domain resources corresponding to the first port (p0), OCC6 is used for the RE corresponding to the second subcarrier 10 in the third subcarrier group;

[0717] For the frequency-domain resources corresponding to the second port (p8), OCC7 is used for the RE corresponding to the first subcarrier 0 in the first subcarrier group;

[0718] For the frequency-domain resources corresponding to the second port (p8), OCC8 is used for the RE corresponding to the second subcarrier 2 in the first subcarrier group;

[0719] For the frequency-domain resources corresponding to the second port (p8), OCC9 is used on the RE corresponding to the first subcarrier 4 in the second subcarrier group;

[0720] For the frequency-domain resources corresponding to the second port (p8), OCC10 is used on the RE corresponding to the second subcarrier 6 in the second subcarrier group;

[0721] For the frequency-domain resources corresponding to the second port (p8), OCC11 is used on the RE corresponding to the first subcarrier 8 in the third subcarrier group;

[0722] For the frequency-domain resources corresponding to the second port (p8), OCC12 is used on the RE corresponding to the second subcarrier 10 in the third subcarrier group.

[0723] Among them, OCC7 to OCC12 form a second OCC code sequence with a length of 6, OCC1 to OCC6 form a first OCC sequence with a length of 4, and the second OCC code sequence is obtained by circularly shifting the first OCC code sequence. OCC1 and OCC2 form a third OCC code sequence, OCC3 and OCC4 form a fourth OCC code sequence, OCC5 and OCC6 form a fifth OCC code sequence. The third OCC code sequence is different from the fourth OCC code sequence, the fourth OCC code sequence is different from the fifth OCC code sequence, and the third OCC code sequence is different from the fifth OCC code sequence. It is also possible to refer to the sequence formed by OCC7 and OCC8 as the third OCC code sequence, the sequence formed by OCC9 and OCC10 as the fourth OCC code sequence, and the sequence formed by OCC11 and OCC12 as the fifth OCC code sequence. In this case, the third OCC code sequence is different from the fourth OCC code sequence, the fourth OCC code sequence is different from the fifth OCC code sequence, and the third OCC code sequence is different from the fifth OCC code sequence.

[0724] In some embodiments, a demodulation reference signal port may correspond to 6M REs, where M is an integer greater than or equal to 1. For example, the value of M can be the number of scheduled PRBs.

[0725] Taking the DMRS configuration type as the first configuration type (Type 1 DMRS) and the time domain position of the DMRS as one symbol as an example, as Figure 4 shown, in each PRB, DMRS port 0 occupies 6 REs in the frequency domain, and the OCC code on these 6 REs is {+1, +1, +1, +1, +1, +1}; DMRS port 1 occupies 6 identical REs in the frequency domain, and the OCC code on these 6 REs is {+1, -1, +1, -1, +1, -1}. This sequence form can be further transformed into a circular shift representation form, for example:

[0726] [1 1 1 1 1 1]·diag(s0) = [1 -1 1 -1 1 -1]

[0727] wherein, wherein diag() means diagonalizing the elements therein to form a diagonal matrix.

[0728] According to the value of, the following sequence can be generated:

[0729]

[0730] Through the inner product operation of complex numbers, it can be verified that the generated sequence is orthogonal to the original sequences {+1, +1, +1, +1, +1, +1} and {+1, -1, +1, -1, +1, -1}.

[0731] When extended to M PRBs, there is:

[0732]

[0733] wherein, m is the RE index, i.e., m = 0, 1, 2, 3, 4, 5,..., 6M - 1. φ is the cyclic shift factor.

[0734] Similarly, it can be obtained that the sequences obtained when φ = 2 or φ = 4 are also orthogonal to the above sequences. Therefore, in the embodiments of the present application, 6 orthogonal sequences can be constructed on 1 DMRS symbol.

[0735] In actual implementation, in CDM group 0, if the value of φ is any two of {1, 2, 4, 5}, combined with the original OCC sequence (i.e., φ = 0 or φ = 3), 4 orthogonal sequences can be formed. Further considering the time-domain OCC, 8 orthogonal sequences can be constructed with two DMRS symbols, and 16 orthogonal DMRS ports can be supported by two CDM groups. If the value of φ takes all values in {1, 2, 4, 5}, up to 24 orthogonal DMRS ports can be constructed.

[0736] Optionally, the transmitting device can map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

[0737]

[0738] k = 4n + 2k' + Δ

[0739] k' = 0, 1

[0740]

[0741] n = 0, 1,...

[0742] j = 0, 1, …, v - 1

[0743] wherein, W f (k′) is the frequency-domain OCC, W t (l′) is the time-domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; wherein, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, v is the number of transmission layers; M is an integer greater than or equal to 1, such as the number of PRBs, and φ is the cyclic shift factor.

[0744] In some other embodiments, still taking the DMRS configuration type as the first configuration type (Type 1 DMRS) and the time-domain position of the DMRS as one symbol as an example, as Figure 4 shown, in each PRB, DMRS port 0 occupies 6 REs in the frequency domain, and the OCC code on these 6 REs is {+1, +1, +1, +1, +1, +1}; DMRS port 1 occupies 6 identical REs in the frequency domain, and the OCC code on these 6 REs is {+1, -1, +1, -1, +1, -1}. This sequence form can be further transformed into a cyclic shift representation form. When the number of scheduled RBs is N and 6N is a multiple of 4, then the REs corresponding to the same DMRS port can be grouped by every 4 REs to construct the OCC codes on different ports. That is:

[0745] [1 1 1 1]·diag(s0) = [1 -1 1 -1]

[0746] wherein, where diag() means diagonalizing the elements therein to form a diagonal matrix.

[0747] When φ = 0 and φ = 2, the OCC codes of DMRS port 0 and port 1 in CDM group 0 are the same as those of DMRS port 2 and port 3 in CDM group 1. When φ = 1 and φ = 3, they are the OCC codes corresponding to the newly added ports. For example:

[0748] The OCC code of the newly added DMRS port 8 is: [1 1 1 1]·diag(s0) = [1 j -1 -j] (φ = 1);

[0749] The OCC code of the newly added DMRS port 9 is: [1 1 1 1]·diag(s0) = [1 -j -1 j] (φ = 3);

[0750] And so on.

[0751] Optionally, the transmitting device may map the demodulation reference signal sequence to the time-domain resources of the demodulation reference signal according to the following formula:

[0752]

[0753] k = 4n + 2k′ + Δ

[0754] k′ = 0, 1

[0755]

[0756] n = 0, 1, …

[0757] where W f (k′) is the frequency-domain OCC, W t (l′) is the time-domain OCC, r(2n + k′) is the initial sequence of the demodulation reference signal; Δ is the CDM group frequency-domain offset; where, is the index of the starting symbol of the demodulation reference signal, l′ is the symbol offset of the demodulation reference signal, v is the number of transmission layers, φ is the cyclic shift factor, and M is a positive integer greater than or equal to 1.

[0758] Figure 12 Exemplarily shows a schematic diagram of the OCC code used when mapping DMRS to RE. As shown in the figure, among the REs corresponding to the same DMRS port, every 4 REs are grouped to construct the OCC codes on different ports. Among them, although port 0 and port 1 correspond to the same RE, since port 0 and port 1 correspond to different φ (i.e., use different OCC codes), orthogonality can be achieved.

[0759] In some embodiments, based on the above formula (12) or formula (13), the process by which the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal may include the following steps:

[0760] Step 1: The transmitting device obtains the CDM group frequency-domain offset, frequency-domain OCC, time-domain OCC, and cyclic shift factor corresponding to the first RE(k, l) according to the above configuration information table, where the subcarrier index of the first RE(k, l) in the above time-frequency resources is k and the symbol index is l;

[0761] Step 2: The transmitting device obtains the data of the sequence of the demodulation reference signal mapped on the first RE(k, l) according to the CDM group frequency-domain offset, frequency-domain OCC, time-domain OCC, and cyclic shift factor The data mapped on the first RE(k, l) satisfies the above formula (12) or formula (13).

[0762] According to the above cyclic shift principle, in the embodiments of the present application, the cyclic shift factor can be set in the configuration information table of the demodulation reference signal. Specifically, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, the CDM group frequency domain offset, the OCC, and the cyclic shift factor, where the OCC includes the frequency domain OCC and the time domain OCC. The transmitting device obtains the frequency domain OCC, the time domain OCC, and the cyclic shift factor corresponding to the demodulation reference signal port index according to the above configuration information table, and performs cyclic shift on the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0763] The following describes the implementation process of the embodiments of the present application by combining Formula (12) or Formula (13) that the above mapping process needs to satisfy, and combining the setting method of the above demodulation reference signal configuration information table, taking the DMRS with the configuration type of the first configuration type (Type 1 DMRS) as an example.

[0764] In some embodiments of the present application, a configuration information table can be set for the DMRS, which includes 16 DMRS port indexes, and the CDM group frequency domain offset, the OCC, and the cyclic shift factor corresponding to each DMRS port index. Specifically, it can be as shown in Table 19.

[0765] Table 19: DMRS Configuration Information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1)

[0766]

[0767] In Table 19, for CDM group 0, the OCC of port 8 is obtained by circular shifting the OCC of port 0 in this CDM group based on the circular shift factor φ = 1; the OCC of port 9 in CDM group 0 is obtained by circular shifting the OCC of port 0 in this CDM group based on the circular shift factor φ = 5; the OCC of port 12 in CDM group 0 is obtained by circular shifting the OCC of port 4 in this CDM group based on the circular shift factor φ = 1; the OCC of port 13 in CDM group 0 is obtained by circular shifting the OCC of port 4 in this CDM group based on the circular shift factor φ = 5; for CDM group 1, the OCC of port 10 is obtained by circular shifting the OCC of port 2 in this CDM group based on the circular shift factor φ = 1; the OCC of port 11 in CDM group 1 is obtained by circular shifting the OCC of port 2 in this CDM group based on the circular shift factor φ = 5; the OCC of port 14 in CDM group 1 is obtained by circular shifting the OCC of port 6 in this CDM group based on the circular shift factor φ = 1; the OCC of port 15 in CDM group 1 is obtained by circular shifting the OCC of port 7 in this CDM group based on the circular shift factor φ = 1.

[0768] In some embodiments of the present application, a configuration information table can be set for DMRS, which includes 16 DMRS port indexes, as well as the CDM group frequency domain offset, OCC, and circular shift factor corresponding to each DMRS port index. Specifically, it can be shown in Table 20.

[0769] Table 20: DMRS Configuration Information of Type 1 DMRS

[0770] (Parameters for PUSCH DM-RS configuration type 1)

[0771]

[0772] In some embodiments of the present application, optionally, the transmitting device can map the demodulation reference signal sequence to the time domain resources of the demodulation reference signal according to the following formula:

[0773]

[0774] k = 4n + 2k' + Δ

[0775] k' = 0, 1

[0776] Or t = mod(n, 2)

[0777]

[0778] n = 0, 1, …

[0779] j = 0, 1, …, v - 1

[0780] Based on the above formula, the OCC code corresponding to each port is shown in Table 21.

[0781] Table 21: DMRS Configuration Information Table for Type 1 DMRS (Parameters for PUSCH DM-RS configuration type 1)

[0782]

[0783] It should be noted that Tables 19 to 21 only exemplarily show several DMRS configuration information. Based on the above principle of cyclic shift, the configuration information table of DMRS may be in other forms and will not be listed one by one here.

[0784] It should also be noted that Tables 19 and 20 only describe the case of indicating 16 ports. According to the above principle of cyclic shift, the number of ports in the DMRS configuration information table can be extended to 24 at most.

[0785] In some embodiments of the present application, the transmitting device may also indicate the port index of the demodulation reference signal configured for the terminal device to the terminal device. Specifically, taking the DMRS in downlink transmission as an example, the network device may send the indication information of the demodulation reference signal port index to the terminal device through DCI.

[0786] In the embodiments of the present application, the correspondence table between the demodulation reference signal port index indication information and the demodulation reference signal port can be extended, and the corresponding reference signal port index indication information is set for the newly added demodulation reference signal ports in the embodiments of the present application.

[0787] Furthermore, in order to save signaling overhead, in the embodiments of the present application, joint encoding can be performed for multiple demodulation reference signal port indexes, so as to indicate multiple demodulation reference signal port indexes with less-bit indication information.

[0788] Taking DMRS as an example below, and adopting the first configuration type (Type 1 DMRS), the correspondence table between the extended DMRS port index indication information and the DMRS port index in the embodiments of the present application will be described.

[0789] Table 22 exemplarily shows a correspondence table between DMRS port index indication information and DMRS port index provided in an embodiment of the present application when rank = 1. Among them, rand = 1 means the number of transmission layers is 1, and the transmitting device configures 1 DMRS port for the receiving device. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0790] Table 22: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 1)

[0791]

[0792] Table 22 shows the values of the port index indication information corresponding to DMRS port indices 0 to 15. Among them, 14 to 21 are the indication information newly added in this embodiment of the present application on the basis of the original indication information, respectively indicating DMRS port indices 8 to 15. The present application does not exclude using other methods to indicate the DMRS port index.

[0793] Table 23 exemplarily shows a correspondence table between DMRS port index indication information and DMRS port index provided in an embodiment of the present application when rank = 2. Among them, rand = 2 means the number of transmission layers is 2, and the transmitting device configures 2 DMRS ports for the receiving device. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0794] Table 23: Correspondence table between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 2)

[0795]

[0796] Table 23 shows the values of the port index indication information corresponding to DMRS port indices 0 to 15. Among them, 10 to 17 are the indication information newly added in this embodiment of the present application on the basis of the original indication information, respectively indicating the port combinations with DMRS port indices greater than or equal to 8. The present application does not exclude using other methods to indicate the DMRS port index.

[0797] Table 24 exemplarily shows a correspondence table between DMRS port index indication information and DMRS port index provided in an embodiment of the present application when rank = 3. Among them, rand = 3 indicates that the number of transmission layers is 3, and the transmitting device configures 3 DMRS ports for the receiving device. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0798] Table 24: Correspondence Table between DMRS Port Index Indication Information and DMRS Port Index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 3)

[0799]

[0800] Table 24 shows the values of the port index indication information corresponding to DMRS port indices 0 to 15. Among them, 3 to 7 are the indication information newly added in this embodiment of the present application on the basis of the original indication information, respectively indicating the port combinations with DMRS port indices greater than or equal to 8. The present application does not exclude using other methods to indicate the DMRS port index.

[0801] Table 25 exemplarily shows a correspondence table between DMRS port index indication information and DMRS port index provided in an embodiment of the present application when rank = 4. Among them, rand = 4 indicates that the number of transmission layers is 4, and the transmitting device configures 4 DMRS ports for the receiving device. maxLength represents the maximum number of DMRS prefix symbols, which represents the maximum number of DMRS prefix symbols.

[0802] Table 25: Correspondence Table between DMRS Port Index Indication Information and DMRS Port Index (Antenna port(s), transform precoder is disabled, dmrs-Type = 1, maxLength = 2, rank = 4)

[0803]

[0804] Table 25 shows the values of the port index indication information corresponding to DMRS port indices 0 to 15. Among them, 4 to 6 are the indication information newly added in this embodiment of the present application on the basis of the original indication information, respectively indicating the port combinations with DMRS port indices greater than or equal to 8. The present application does not exclude using other methods to indicate the DMRS port index.

[0805] Refer to Figure 13As shown, it is a flowchart of a signal transmission method implemented on the receiving device side provided by an embodiment of the present application. This method can be applied to Figure 1 the network architecture shown. Of course, it can also be applied to network architectures other than this. The present application does not make any limitations in this regard. When applying this method to Figure 1 the network architecture shown, for downlink demodulation reference signal transmission, the transmitting device involved in this method can be Figure 1 the network device 101 in Figure 1 , and the receiving device involved in this method can be Figure 1 the terminal devices (102a to 102d) in Figure 1 ; for uplink demodulation reference signal transmission, the transmitting device involved in this method can be Figure 1 the terminal devices (102a to 102d) in Figure 1 , and the receiving device involved in this method can be Figure 1 the network device 101 in

[0806] Referring to Figure 13 shown, this method may include the following processing procedures:

[0807] S1201: The receiving device receives the demodulation reference signal sent by the transmitting device on the time-frequency resources of the demodulation reference signal.

[0808] Among them, for the relevant descriptions of the demodulation reference signal and the transmitting device sending the demodulation reference signal, reference can be made to Figure 11 the relevant content in

[0809] S1202: The receiving device obtains the sequence of the demodulation reference signal.

[0810] In some embodiments, a configuration information table of the demodulation reference signal is configured in the receiving device. Among them, for the relevant descriptions of the configuration information table, reference can be made to Figure 11 the relevant descriptions in the process involved. The receiving device can process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain the sequence of the demodulation reference signal. Specifically, it may include the following steps:

[0811] Step 1: The receiving device obtains the CDM group frequency domain offset, frequency domain OCC, time domain OCC, and cyclic shift factor corresponding to the first RE(k, l) according to the configuration information table of the demodulation reference signal, where the subcarrier index of the first RE(k, l) in the time-frequency resources is k and the symbol index is l;

[0812] Step 2: The receiving device obtains the data of the demodulation reference signal on the first RE(k, l) according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC, and the cyclic shift factor The data mapped on the first RE(k, l) Meet the above formula (12) or formula (13) or formula (14).

[0813] In some embodiments, the receiving device receives the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device, thereby obtains the demodulation reference signal port index allocated by the sending device according to the indication information of the demodulation reference signal port index, and queries the above configuration information table of the demodulation reference signal according to the demodulation reference signal port index and the CDM group to which it belongs to obtain the OCC code, and then calculates the sequence of the demodulation reference signal based on the mapping formula of the demodulation reference signal.

[0814] According to the above embodiments of the present application, the number of orthogonal DMRS ports can be increased without additional DMRS overhead. In addition, it is also possible to be compatible with existing receiving devices, that is, the new receiving device provided by the present application can be multi-user paired with a receiving device that only supports the existing standard capabilities, and the existing receiving device does not need to be updated in terms of hardware and software. The expansion of the DMRS orthogonal ports can enable multi-user orthogonal pairing of more layers in the uplink or downlink, which is beneficial to improving the system capacity.

[0815] Based on the same inventive concept, an embodiment of the present application further provides a communication device, which may have the structure as Figure 14 shown. The communication device may be the sending device in the above embodiment, or a chip or a chip system capable of supporting the above sending device to implement the above method. When the communication device is the sending device in the above embodiment, it has the behavior functions of the sending device in the above method embodiment. For downlink demodulation reference signal transmission, the communication device may be a network device, and for uplink demodulation reference signal transmission, the communication device may be a terminal device.

[0816] As Figure 14 shown, the communication device 1300 may include a processing unit 1301 and a transceiver unit 1302. The communication device 1300 may further have a storage unit 1303, and the storage unit 1303 may be coupled to the processing unit 1301 for storing programs and instructions required for the processing unit 1301 to execute functions.

[0817] Based on the above Figure 14 shown communication device, the communication device can implement Figure 3 the method shown.

[0818] Specifically, in some embodiments, the processing unit 1301 may be configured to generate a sequence of demodulation reference signals for estimating the channel state of the first channel; the transceiver unit 1302 may be configured to map the sequence of demodulation reference signals to the time-frequency resources of the demodulation reference signals and transmit them. Among them, the time-frequency resources include the frequency-domain resources corresponding to the first CDM group. The frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the first PRB in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers each include 2 subcarriers, the first group of subcarriers corresponds to the first group of OCCs, the second group of subcarriers corresponds to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0819] Further, in some embodiments, the first PRB further includes a third group of subcarriers, the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCCs.

[0820] Further, in some embodiments, the configuration information table of the demodulation reference signals includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes the frequency-domain OCC and the time-domain OCC, and the frequency-domain OCC includes the first group of OCCs and the second group of OCCs.

[0821] Further, in some embodiments, the configuration information table of the demodulation reference signals includes a first configuration information table and a second configuration information table; the first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, and the OCC includes the frequency-domain OCC and the time-domain OCC; the second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes the frequency-domain OCC and the time-domain OCC, the frequency-domain OCC includes the first group of OCCs and the second group of OCCs, and the demodulation reference signal port indexes included in the second configuration information table and the first configuration information table are different.

[0822] Further, in some embodiments, the processing unit 1301 is further configured to: obtain the first group of OCCs corresponding to the first group of subcarriers and the second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

[0823] Further, in some embodiments, the processing unit 1301 is configured to: obtain the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE (k, l) according to the configuration information table, where the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE (k, l) Satisfies the above formula (4).

[0824] Further, in some embodiments, the processing unit 1301 is configured to send the indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0825] Further, in some embodiments, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0826] Based on the above Figure 14 The shown communication device can implement Figure 7 The shown method.

[0827] Specifically, in some embodiments, the processing unit 1301 may be configured to generate a sequence of demodulation reference signals for estimating the channel state of the first channel; the transceiver unit 1302 may be configured to map the sequence of demodulation reference signals to the time-frequency resource of the demodulation reference signal and send it. Wherein, the time-frequency resource includes the frequency-domain resource corresponding to the first CDM group, and the frequency-domain resource corresponding to the first CDM group is discontinuous and arranged at equal intervals; the time-domain resource corresponding to the first CDM group includes a first group of symbols and a second group of symbols, the first group of symbols corresponds to the first group of OCCs, the second group of symbols corresponds to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0828] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes the frequency-domain OCC and the time-domain OCC, the time-domain OCC includes the first group of OCCs and the second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0829] Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to a first demodulation reference signal type, and the second configuration information table corresponds to a second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. The first configuration information table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs. The second information configuration table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCCs.

[0830] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency domain OCC and a time domain OCC. The frequency domain OCC includes a first group of OCCs and a second group of OCCs. The first group of OCCs corresponds to the first demodulation reference signal type, and the second group of OCCs corresponds to the second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0831] Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to a first demodulation reference signal type, and the second configuration information table corresponds to a second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. The first configuration information table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs. The second information configuration table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group of OCCs.

[0832] Further, in some embodiments, the processing unit 1301 is configured to: obtain a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

[0833] Further, in some embodiments, the processing unit 1301 maps the sequence of the demodulation reference signals to the time-frequency resources of the demodulation reference signals, including: obtaining, according to the configuration information table, the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC corresponding to a first RE(k,l), where the subcarrier index of the first RE(k,l) in the time-frequency resources is k and the symbol index is l; and obtaining, according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC, the data of the sequence of the demodulation reference signals mapped on the first RE(k,l). The data mapped on the first RE(k,l). Satisfies the above formula (6) or formula (7).

[0834] Further, in some embodiments, the processing unit 1301 is configured to send the indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0835] Further, in some embodiments, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols included in the first group of symbols or the second group of symbols, and the number of symbols included in the first group of symbols and the second group of symbols is the same.

[0836] Based on the above Figure 14 The shown communication device can implement Figure 10 The shown method.

[0837] Specifically, in some embodiments, the processing unit 1301 may be configured to generate a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate the channel state of a first channel; and the transceiver unit 1302 may be configured to map the sequence of the demodulation reference signals to the time-frequency resources of the demodulation reference signals and send them. Among them, the RE corresponding to the first port of the demodulation reference signals in the first CDM group uses a first OCC, the RE corresponding to the second port of the demodulation reference signals in the first CDM group uses a second OCC, the second OCC is obtained by cyclic shifting the first OCC, and the first OCC and the second OCC are orthogonal.

[0838] Further, in some embodiments, the configuration information table of the demodulation reference signals includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency-domain offset, the OCC, and the cyclic shift factor, where the OCC includes the frequency-domain OCC and the time-domain OCC.

[0839] Further, in some embodiments, the processing unit 1301 is configured to: obtain a frequency-domain OCC, a time-domain OCC, and a cyclic shift factor corresponding to a demodulation reference signal port index according to the configuration information table, and perform a cyclic shift on the obtained frequency-domain OCC and time-domain OCC according to the obtained cyclic shift factor.

[0840] Further, in some embodiments, the processing unit 1301 is configured to: obtain a CDM group frequency-domain offset, a frequency-domain OCC, a time-domain OCC, and a cyclic shift factor corresponding to a first RE (k, l) according to the configuration information table, where the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor The data mapped on the first RE (k, l) Satisfies the above formula (12) or the above formula (13) or the above formula (14).

[0841] Further, in some embodiments, the processing unit 1301 is configured to: send indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

[0842] Further, in some embodiments, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0843] In addition, an embodiment of the present application further provides a communication device, which may have a structure as Figure 15 shown. The communication device may be a transmitting device, or a chip or a chip system capable of supporting the transmitting device to implement the above method. For downlink demodulation reference signal transmission, the communication device may be a network device, and for uplink demodulation reference signal transmission, the communication device may be a terminal device.

[0844] As Figure 15 shown, the communication device 1400 may include at least one processor 1402, and the at least one processor 1402 is used to be coupled with a memory, read and execute instructions in the memory to implement the steps related to the transmitting device in the method provided by the embodiment of the present application. Optionally, the communication device 1400 may further include a transceiver 1401, which is used to support the communication device 1400 to receive or send signaling or data. The transceiver 1401 in the communication device 1400 can be used to implement the functions of the above transceiver unit 1302. For example, the transceiver 1401 can be used for the communication device 1400 to execute as Figure 3 、Figure 7 or Figure 10 In the method of generating a demodulation reference signal sequence shown, the processor 1402 can be used to implement the functions of the above-mentioned processing unit 1301. For example, the processor 1402 can be used for the communication device 1400 to execute as Figure 3 , Figure 7 or Figure 10 In the method shown, the step of mapping the demodulation reference signal sequence to time-frequency resources. In addition, the transceiver 1401 can be coupled to the antenna 1403 to support the communication device 1400 in communicating. Optionally, the communication device 1400 may further include a memory 1404, which stores computer programs and instructions. The memory 1404 can be coupled to the processor 1402 and / or the transceiver 1401 to support the processor 1402 in calling the computer programs and instructions in the memory 1404 to implement the steps involved in the sending device in the method provided by the embodiments of the present application; in addition, the memory 1404 can also be used to store the data involved in the method embodiments of the present application. For example, it is used to store the data and instructions necessary to support the transceiver 1401 in realizing the interaction, and / or, it is used to store the configuration information necessary for the communication device 1400 to execute the method described in the embodiments of the present application.

[0845] Based on the same inventive concept, the embodiments of the present application further provide a communication device, which may have a structure as Figure 16 shown. The communication device may be the receiving device in the above embodiments, or a chip or chip system capable of supporting the above receiving device in implementing the above method. When the communication device is the receiving device in the above embodiments, it has the behavioral functions of the receiving device in the above method embodiments. For downlink demodulation reference signal transmission, the communication device may be a terminal device, and for uplink demodulation reference signal transmission, the communication device may be a network device.

[0846] As Figure 16 shown, the communication device 1500 may include a processing unit 1501 and a transceiver unit 1502. The communication device 1500 may further have a storage unit 1503, and the storage unit 1503 can be coupled to the processing unit 1501 to store the programs and instructions required for the processing unit 1501 to execute functions.

[0847] Based on the above Figure 16 shown communication device, the communication device can implement Figure 6 the method shown.

[0848] Specifically, in some embodiments, the transceiver unit 1502 may be configured to receive a demodulation reference signal sent by a transmitting device on the time-frequency resources of the demodulation reference signal, where the demodulation reference signal is used to estimate the channel state of a first channel; the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signal. Among them, the time-frequency resources include frequency-domain resources corresponding to a first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; a first PRB in the frequency-domain resources corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers each include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes OCC, the second group of subcarriers corresponds to a second group of OCC, and the first group of OCC is orthogonal to the second group of OCC.

[0849] Further, in some embodiments, the first PRB further includes a third group of subcarriers, the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCC.

[0850] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes a frequency-domain OCC and a time-domain OCC, and the frequency-domain OCC includes a first group of OCC and a second group of OCC.

[0851] Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table; the first configuration information table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, and the OCC includes a frequency-domain OCC and a time-domain OCC; the second information configuration table includes the correspondence between the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, the OCC includes a frequency-domain OCC and a time-domain OCC, the frequency-domain OCC includes a first group of OCC and a second group of OCC, and the demodulation reference signal port indices included in the second configuration information table and the first configuration information table are different.

[0852] Further, in some embodiments, the processing unit 1501 is further configured to: obtain a first group of OCC corresponding to the first group of subcarriers and a second group of OCC corresponding to the second group of subcarriers according to the configuration information table.

[0853] Further, in some embodiments, the processing unit 1501 is configured to: obtain the CDM group frequency-domain offset, frequency-domain OCC, and time-domain OCC corresponding to the first RE (k, l) according to the configuration information table, where the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, and the time-domain OCC The data mapped on the first RE (k, l) Satisfies the above formula (4).

[0854] Further, in some embodiments, the processing unit 1301 is configured to receive the indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0855] Further, in some embodiments, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0856] Based on the above Figure 16 The shown communication device can implement Figure 11 The shown method.

[0857] Specifically, in some embodiments, the transceiver unit 1502 may be configured to receive the demodulation reference signal sent by the sending device on the time-frequency resource of the demodulation reference signal, where the demodulation reference signal is used to estimate the channel state of the first channel; the processing unit 1501 may be configured to obtain the sequence of the demodulation reference signal. The time-frequency resource includes the frequency-domain resources corresponding to the first CDM group, where the frequency-domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time-domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

[0858] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency-domain offset, and the OCC, where the OCC includes the frequency-domain OCC and the time-domain OCC, the time-domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0859] Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to a first demodulation reference signal type, and the second configuration information table corresponds to a second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. The first configuration information table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCC. The second information configuration table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCC.

[0860] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. Among them, the OCC includes a frequency domain OCC and a time domain OCC. The frequency domain OCC includes a first group of OCC and a second group of OCC. The first group of OCC corresponds to the first demodulation reference signal type, and the second group of OCC corresponds to the second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

[0861] Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table. The first configuration information table corresponds to a first demodulation reference signal type, and the second configuration information table corresponds to a second demodulation reference signal type. The first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. The first configuration information table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCC. The second information configuration table includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, and the OCC. The OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group of OCC.

[0862] Further, in some embodiments, the processing unit 1501 is configured to: obtain a first group of OCC corresponding to the first group of symbols and a second group of OCC corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

[0863] Further, in some embodiments, the processing unit 1501 maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal, including: obtaining, according to the configuration information table, the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC corresponding to the first RE (k, l), where the subcarrier index of the first RE (k, l) in the time-frequency resources is k and the symbol index is l; obtaining the data of the sequence of the demodulation reference signal mapped on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC The data mapped on the first RE (k, l) Satisfies the above formula (6) or formula (7).

[0864] Further, in some embodiments, the processing unit 1501 is configured to receive the port index indication information of the demodulation reference signal sent by the sending device.

[0865] Further, in some embodiments, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols included in the first group of symbols or the second group of symbols, and the number of symbols included in the first group of symbols and the second group of symbols is the same.

[0866] Based on the above Figure 16 The shown communication device can implement Figure 13 The shown method.

[0867] Specifically, in some embodiments, the transceiver unit 1502 may be configured to receive, on the time-frequency resources of the demodulation reference signal, the demodulation reference signal sent by the sending device, where the demodulation reference signal is used to estimate the channel state of the first channel; the processing unit 1501 may be configured to obtain the sequence of the demodulation reference signal. Among them, the RE corresponding to the first port of the demodulation reference signal in the first CDM group uses the first OCC, and the RE corresponding to the second port of the demodulation reference signal in the first CDM group uses the second OCC, where the second OCC is obtained by cyclically shifting the first OCC, and the first OCC and the second OCC are orthogonal.

[0868] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the corresponding relationship between the demodulation reference signal port index, the CDM group frequency domain offset, the OCC, and the cyclic shift factor, where the OCC includes the frequency domain OCC and the time domain OCC.

[0869] Further, in some embodiments, the processing unit 1501 is configured to: obtain, according to the configuration information table, a frequency-domain OCC, a time-domain OCC, and a cyclic shift factor corresponding to a demodulation reference signal port index, and perform a cyclic shift on the obtained frequency-domain OCC and time-domain OCC according to the obtained cyclic shift factor.

[0870] Further, in some embodiments, the processing unit 1501 is configured to: obtain, according to the configuration information table, a CDM group frequency-domain offset, a frequency-domain OCC, a time-domain OCC, and a cyclic shift factor corresponding to a first RE(k, l), where the subcarrier index of the first RE(k, l) in the time-frequency resource is k and the symbol index is l; and obtain data of a sequence mapping of the demodulation reference signal on the first RE(k, l) according to the CDM group frequency-domain offset, the frequency-domain OCC, the time-domain OCC, and the cyclic shift factor. The data mapped on the first RE(k, l) Satisfies the above formula (12) or the above formula (13) or the above formula (14).

[0871] Further, in some embodiments, the processing unit 1501 is configured to: send indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

[0872] Further, in some embodiments, the maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is the number of symbols occupied by the demodulation reference signal.

[0873] In addition, an embodiment of the present application further provides a communication device, which may have a structure as Figure 17 shown. The communication device may be a receiving device, or a chip or a chip system capable of supporting the receiving device to implement the above method. For downlink demodulation reference signal transmission, the communication device may be a terminal device, and for uplink demodulation reference signal transmission, the communication device may be a network device.

[0874] As Figure 17 shown, the communication device 1600 may include at least one processor 1602, and the at least one processor 1602 is used to be coupled with a memory, read and execute instructions in the memory to implement steps related to the receiving device in the method provided by the embodiments of the present application. Optionally, the communication device 1600 may further include a transceiver 1601, which is used to support the communication device 1600 to receive or send signaling or data. The transceiver 1601 in the communication device 1600 may be used to implement the functions of the above transceiver unit 1502. For example, the transceiver 1601 may be used for the communication device 1600 to execute as Figure 6 ,Figure 10 or Figure 13 In the step of receiving the demodulation reference signal in the method shown, the processor 1602 can be used to implement the functions of the above-mentioned processing unit 1501. For example, the processor 1602 can be used for the communication device 1600 to execute as Figure 6 , Figure 10 or Figure 13 In the step of obtaining the demodulation reference signal sequence in the method shown. In addition, the transceiver 1601 can be coupled to the antenna 1603 to support the communication device 1600 to communicate. Optionally, the communication device 1600 may further include a memory 1604, in which computer programs and instructions are stored. The memory 1604 can be coupled to the processor 1602 and / or the transceiver 1601 to support the processor 1602 to call the computer programs and instructions in the memory 1604 to implement the steps related to the receiving device in the method provided by the embodiments of the present application; in addition, the memory 1604 can also be used to store the data involved in the method embodiments of the present application. For example, it is used to store the data and instructions necessary to support the transceiver 1601 to implement the interaction, and / or, it is used to store the configuration information necessary for the communication device 1600 to execute the method described in the embodiments of the present application.

[0875] Based on the same concept as the above method embodiments, the embodiments of the present application also provide a computer-readable storage medium, on which some instructions are stored. When these instructions are called and executed by a computer, the computer can complete the methods involved in any possible design of the above method embodiments and method embodiments. In the embodiments of the present application, the computer-readable storage medium is not limited. For example, it can be RAM (random-access memory), ROM (read-only memory), etc.

[0876] Based on the same concept as the above method embodiments, the present application also provides a computer program product, which can complete the methods involved in the method embodiments and any possible design of the above method embodiments when called and executed by a computer.

[0877] Based on the same concept as the above method embodiments, the present application also provides a chip, which can include a processor and an interface circuit, and is used to complete the methods involved in any possible implementation manner of the above method embodiments and method embodiments. Among them, "coupling" means that two components are directly or indirectly combined with each other. This combination can be fixed or movable, and this combination can allow flowing liquid, electricity, electrical signals or other types of signals to communicate between the two components.

[0878] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0879] In the embodiments of the present application, the various illustrative logical units and circuits described can be implemented or operate the described functions through a design of a general-purpose processor, a digital signal processor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above. The general-purpose processor may be a microprocessor. Optionally, the general-purpose processor may also be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0880] The steps of the methods or algorithms described in the embodiments of the present application may be directly embedded in hardware, software units executed by a processor, or a combination of the two. The software units may be stored in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium in the art. Exemplarily, the storage medium may be connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Optionally, the storage medium may also be integrated into the processor. The processor and the storage medium may be provided in an ASIC, and the ASIC may be provided in a terminal device. Optionally, the processor and the storage medium may also be provided in different components of the terminal device.

[0881] These computer program instructions may also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 a process or multiple processes and / or blocks Figure 1 a block or multiple blocks.

[0882] Although the present invention has been described in connection with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the scope of the present invention. Accordingly, the present specification and the drawings are merely exemplary illustrations of the present invention defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A signal transmission method, characterized in that, Applied to a transmitting device, the method includes: Receiving first information, where the first information indicates a demodulation reference signal (DMRS) port index; Obtaining, according to the DMRS port index, a code division multiplexing (CDM) group index, a frequency-domain orthogonal spreading code (OCC), and a time-domain OCC corresponding to the DMRS port index; wherein, the length of the frequency-domain OCC is 4, the value of the DMRS port index is an integer greater than or equal to 8, and the value of the CDM group index is 0 or 1.

2. The method according to claim 1, characterized in that, The DMRS port index includes at least one of a first DMRS port index, a second DMRS port index, a third DMRS port index, a fourth DMRS port index, a fifth DMRS port index, a sixth DMRS port index, a seventh DMRS port index, and an eighth DMRS port index; The frequency-domain OCC includes 4 codes, which are w f (0), w f (1), w f (2) and w f (3); The w in the frequency-domain OCC corresponding to the first DMRS port index f (0) takes the value of 1, and w f (1) takes the value of j, and w f (2) takes the value of -1, and w f (3) takes the value of -j; w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes the value of 1, w f (1) takes the value of -j, w f (2) takes the value of -1, w f (3) takes the value of j; w in the frequency-domain OCC corresponding to the third DMRS port index f (0) takes the value of 1, w f (1) takes the value of j, w f (2) takes the value of -1, w f (3) takes the value of -j; w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes a value of 1, w f (1) takes a value of -j, w f (2) takes a value of -1, w f (3) takes a value of j; The w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of j, and w f (2) takes the value of -1, and w f (3) takes the value of -j; w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -j, w f (2) takes the value of -1, w f (3) takes the value of j; The w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) takes the value of 1, and w f (1) takes the value of j, and w f (2) takes the value of -1, and w f (3) takes the value of -j; The w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) takes the value of 1, and w f (1) takes the value of -j, and w f (2) takes the value of -1, and w f (3) takes the value of j.

3. The method according to claim 2, characterized in that, The value of the first DMRS port index is 8, the value of the second DMRS port index is 9, the value of the third DMRS port index is 10, the value of the fourth DMRS port index is 11, the value of the fifth DMRS port index is 12, the value of the sixth DMRS port index is 13, the value of the seventh DMRS port index is 14, and the value of the eighth DMRS port index is 15.

4. The method according to any one of claims 1 - 3, characterized in that, The correspondence between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

5. The method according to claim 1, characterized in that, The DMRS port index includes at least one of a first DMRS port index, a second DMRS port index, a third DMRS port index, a fourth DMRS port index, a fifth DMRS port index, a sixth DMRS port index, a seventh DMRS port index, an eighth DMRS port index, a ninth DMRS port index, a tenth DMRS port index, an eleventh DMRS port index, a twelfth DMRS port index, a thirteenth DMRS port index, a fourteenth DMRS port index, a fifteenth DMRS port index, and a sixteenth DMRS port index; The frequency-domain OCC includes 4 codes, which are w f (0), w f (1), w f (2) and w f (3); The w in the frequency-domain OCC corresponding to the first DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of 1, and w f (3) takes the value of 1; w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes the value of 1, w f (1) takes the value of -1, w f (2) takes the value of 1, w f (3) takes the value of -1; The w in the frequency-domain OCC corresponding to the third DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of 1, and w f (3) takes the value of 1; The value of w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) is 1, and w f (1) is -1, and w f (2) is 1, and w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) takes a value of 1, and w f (1) takes a value of -1, and w f (2) takes a value of 1, and w f (3) takes a value of -1; The value of w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; The value of w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is 1, and the value of w f (3) is -1; w in the frequency-domain OCC corresponding to the ninth DMRS port index f (0) has a value of 1, w f (1) has a value of 1, w f (2) has a value of -1, w f (3) has a value of -1; w in the frequency-domain OCC corresponding to the tenth DMRS port index f (0) takes a value of 1, w f (1) takes a value of -1, w f (2) takes a value of -1, w f (3) takes a value of 1; The value of w in the frequency-domain OCC corresponding to the index of the eleventh DMRS port f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is -1, and the value of w f (3) is -1; The w in the frequency-domain OCC corresponding to the twelfth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The w in the frequency-domain OCC corresponding to the index of the thirteenth DMRS port f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of -1, and w f (3) takes the value of -1; w in the frequency-domain OCC corresponding to the fourteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The w in the frequency-domain OCC corresponding to the fifteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of -1, and w f (3) takes the value of -1; The value of w in the frequency-domain OCC corresponding to the sixteenth DMRS port index f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is -1, and the value of w f (3) is 1.

6. The method according to claim 1 or 5, characterized in that The correspondence between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

7. The method according to any one of claims 1-3, 5, characterized in that The first information is indicated by dedicated control information (DCI) or higher-layer signaling.

8. The method according to any one of claims 1-3, 5, characterized in that It further includes: Obtaining data of the sequence mapping of the DMRS on a resource element RE(k, l) according to the CDM group index, the frequency-domain OCC, and the time-domain OCC, where k is a subcarrier index and l is a symbol index.

9. A signal transmission method, characterized in that Applied to a receiving device, the method includes: Sending first information, where the first information indicates a DMRS port index; Obtaining, according to the DMRS port index, a CDM group index, a frequency-domain orthogonal spreading code (OCC), and a time-domain OCC corresponding to the DMRS port index; wherein, the length of the frequency-domain OCC is 4, the value of the DMRS port index is an integer greater than or equal to 8, and the value of the CDM group index is 0 or 1.

10. The method according to claim 9, characterized in that The DMRS port index includes at least one of a first DMRS port index, a second DMRS port index, a third DMRS port index, a fourth DMRS port index, a fifth DMRS port index, a sixth DMRS port index, a seventh DMRS port index, and an eighth DMRS port index; The frequency-domain OCC includes 4 codes, which are w f (0), w f (1), w f (2) and w f (3); The w in the frequency-domain OCC corresponding to the first DMRS port index f (0) takes the value of 1, and w f (1) takes the value of j, and w f (2) takes the value of -1, and w f (3) takes the value of -j; The w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -j, and w f (2) takes the value of -1, and w f (3) takes the value of j; The w in the frequency-domain OCC corresponding to the third DMRS port index f (0) takes the value of 1, and w f (1) takes the value of j, and w f (2) takes the value of -1, and w f (3) takes the value of -j; w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -j, w f (2) takes the value of -1, w f (3) takes the value of j; The w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) takes a value of 1, and w f (1) takes a value of j, and w f (2) takes a value of -1, and w f (3) takes a value of -j; w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -j, w f (2) takes the value of -1, w f (3) takes the value of j; The value of w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) is 1, and the value of w f (1) is j, and the value of w f (2) is -1, and the value of w f (3) is -j; The w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) takes the value of 1, and w f (1) takes the value of -j, and w f (2) takes the value of -1, and w f (3) takes the value of j.

11. The method according to claim 10, characterized in that The value of the first DMRS port index is 8, the value of the second DMRS port index is 9, the value of the third DMRS port index is 10, the value of the fourth DMRS port index is 11, the value of the fifth DMRS port index is 12, the value of the sixth DMRS port index is 13, the value of the seventh DMRS port index is 14, and the value of the eighth DMRS port index is 15.

12. The method according to any one of claims 9-11, characterized in that The correspondence relationship between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

13. The method according to claim 9, characterized in that The DMRS port index includes at least one of a first DMRS port index, a second DMRS port index, a third DMRS port index, a fourth DMRS port index, a fifth DMRS port index, a sixth DMRS port index, a seventh DMRS port index, an eighth DMRS port index, a ninth DMRS port index, a tenth DMRS port index, an eleventh DMRS port index, a twelfth DMRS port index, a thirteenth DMRS port index, a fourteenth DMRS port index, a fifteenth DMRS port index, and a sixteenth DMRS port index; The frequency-domain OCC includes 4 codes, which are w f (0), w f (1), w f (2) and w f (3); The w in the frequency-domain OCC corresponding to the first DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of 1, and w f (3) takes the value of 1; w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes the value of 1, w f (1) takes the value of -1, w f (2) takes the value of 1, w f (3) takes the value of -1; The value of w in the frequency-domain OCC corresponding to the third DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -1, w f (2) takes the value of 1, w f (3) takes the value of -1; w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) takes a value of 1, and w f (1) takes a value of 1, and w f (2) takes a value of 1, and w f (3) takes a value of 1; The value of w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is 1, and the value of w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; The value of w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is 1, and the value of w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the index of the ninth DMRS port f (0) is 1, and w f (1) is 1, and w f (2) is -1, and w f (3) is -1; The w in the frequency-domain OCC corresponding to the index of the tenth DMRS port f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The value of w in the frequency-domain OCC corresponding to the index of the eleventh DMRS port f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is -1, and the value of w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the twelfth DMRS port index f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is -1, and the value of w f (3) is 1; The value of w in the frequency-domain OCC corresponding to the index of the thirteenth DMRS port f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is -1, and the value of w f (3) is -1; w in the frequency-domain OCC corresponding to the fourteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The w in the frequency-domain OCC corresponding to the fifteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of -1, and w f (3) takes the value of -1; The w in the frequency-domain OCC corresponding to the index of the sixteenth DMRS port f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1.

14. The method according to claim 9 or 13, characterized in that, The correspondence relationship between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, W f (k′) is the frequency domain OCC, W t (l′) is the time domain OCC.

15. The method according to any one of claims 9-10 and 13, characterized in that, The first information is indicated by dedicated control information DCI or high-layer signaling.

16. The method according to any one of claims 9-10 and 13, characterized in that, It further includes: Obtain the data of DMRS on the resource element RE(k,l) according to the CDM group index, the frequency-domain OCC, and the time-domain OCC.

17. A communication device, characterized in that, It includes at least one processor, the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs: Receive first information, where the first information indicates a demodulation reference signal DMRS port index; Obtain a code division multiplexing CDM group index, a frequency-domain orthogonal spreading code OCC, and a time-domain OCC corresponding to the DMRS port index according to the DMRS port index; wherein, the length of the frequency-domain OCC is 4, the value of the DMRS port index is an integer greater than or equal to 8, and the value of the CDM group index is 0 or 1.

18. The communication device according to claim 17, characterized in that, The DMRS port index includes at least one of a first DMRS port index, a second DMRS port index, a third DMRS port index, a fourth DMRS port index, a fifth DMRS port index, a sixth DMRS port index, a seventh DMRS port index, and an eighth DMRS port index; The frequency-domain OCC includes 4 codes, which are w f (0), w f (1), w f (2) and w f (3); The value of w in the frequency-domain OCC corresponding to the first DMRS port index f (0) is 1, and w f (1) is j, and w f (2) is -1, and w f (3) is -j; The w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes a value of 1, and w f (1) takes a value of -j, and w f (2) takes a value of -1, and w f (3) takes a value of j; The value of w in the frequency-domain OCC corresponding to the third DMRS port index f (0) is 1, and the value of w f (1) is j, and the value of w f (2) is -1, and the value of w f (3) is -j; w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -j, w f (2) takes the value of -1, w f (3) takes the value of j; The w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of j, and w f (2) takes the value of -1, and w f (3) takes the value of -j; The w in the frequency-domain OCC corresponding to the index of the sixth DMRS port f (0) takes the value of 1, and w f (1) takes the value of -j, and w f (2) takes the value of -1, and w f (3) takes the value of j; w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) takes the value of 1, w f (1) takes the value of j, w f (2) takes the value of -1, w f (3) takes the value of -j; The value of w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) is 1, and the value of w f (1) is -j, and the value of w f (2) is -1, and the value of w f (3) is j.

19. The communication device according to claim 18, characterized in that, The index value of the first DMRS port is 8, the index value of the second DMRS port is 9, the index value of the third DMRS port is 10, the index value of the fourth DMRS port is 11, the index value of the fifth DMRS port is 12, the index value of the sixth DMRS port is 13, the index value of the seventh DMRS port is 14, and the index value of the eighth DMRS port is 15.

20. The communication device according to claim 18 or 19, characterized in that, The correspondence relationship between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

21. The communication device according to claim 17, wherein, The DMRS port index includes at least one of the first DMRS port index, the second DMRS port index, the third DMRS port index, the fourth DMRS port index, the fifth DMRS port index, the sixth DMRS port index, the seventh DMRS port index, the eighth DMRS port index, the ninth DMRS port index, the tenth DMRS port index, the eleventh DMRS port index, the twelfth DMRS port index, the thirteenth DMRS port index, the fourteenth DMRS port index, the fifteenth DMRS port index, and the sixteenth DMRS port index; The frequency-domain OCC includes 4 codes, which are w f (0), w f (1), w f (2) and w f (3); The value of w in the frequency-domain OCC corresponding to the first DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; The value of w in the frequency-domain OCC corresponding to the second DMRS port index f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is 1, and the value of w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the third DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -1, w f (2) takes the value of 1, w f (3) takes the value of -1; The value of w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) takes a value of 1, and w f (1) takes a value of -1, and w f (2) takes a value of 1, and w f (3) takes a value of -1; The value of w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; The value of w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) is 1, and w f (1) is -1, and w f (2) is 1, and w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the ninth DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is -1, and the value of w f (3) is -1; The w in the frequency-domain OCC corresponding to the tenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The value of w f in the frequency-domain OCC corresponding to the eleventh DMRS port index is 1, and the value of w f in (1) is 1, and the value of w f in (2) is -1, and the value of w f in (3) is -1; The value of w in the frequency-domain OCC corresponding to the twelfth DMRS port index f (0) is 1, and w f (1) is -1, and w f (2) is -1, and w f (3) is 1; The w in the frequency-domain OCC corresponding to the index of the thirteenth DMRS port f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of -1, and w f (3) takes the value of -1; The w in the frequency-domain OCC corresponding to the fourteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The w in the frequency-domain OCC corresponding to the fifteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of -1, and w f (3) takes the value of -1; The value of w in the frequency-domain OCC corresponding to the index of the sixteenth DMRS port f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is -1, and the value of w f (3) is 1.

22. The communication device according to claim 17 or 21, wherein, The correspondence relationship between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

23. The communication device according to any one of claims 17-19 and 21, wherein, The first information is indicated by dedicated control information DCI or higher-layer signaling.

24. The communication device according to any one of claims 17-19 and 21, wherein, The device further performs: Obtain the data of the sequence mapping of the DMRS on the resource element RE(k, l) according to the CDM group index, the frequency-domain OCC, and the time-domain OCC, where k is the subcarrier index and l is the symbol index.

25. A communication device, wherein, Including at least one processor, the at least one processor is connected to a memory, and the at least one processor is configured to read and execute a program stored in the memory, so that the device performs: Send first information, where the first information indicates the DMRS port index; Obtain the code division multiplexing CDM group index, the frequency-domain orthogonal spreading code OCC, and the time-domain OCC corresponding to the DMRS port index according to the DMRS port index; where the length of the frequency-domain OCC is 4, the value of the DMRS port index is an integer greater than or equal to 8, and the value of the CDM group index is 0 or 1.

26. The communication device according to claim 25, wherein, The DMRS port index includes at least one of the first DMRS port index, the second DMRS port index, the third DMRS port index, the fourth DMRS port index, the fifth DMRS port index, the sixth DMRS port index, the seventh DMRS port index, and the eighth DMRS port index; The frequency-domain OCC includes four codes, which are w f (0), w f (1), w f (2) and w f (3); w in the frequency-domain OCC corresponding to the first DMRS port index f (0) takes the value of 1, w f (1) takes the value of j, w f (2) takes the value of -1, w f (3) takes the value of -j; w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes a value of 1, w f (1) takes a value of -j, w f (2) takes a value of -1, w f (3) takes a value of j; The value of w in the frequency-domain OCC corresponding to the third DMRS port index f (0) is 1, and the value of w f (1) is j, and the value of w f (2) is -1, and the value of w f (3) is -j; The w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -j, and w f (2) takes the value of -1, and w f (3) takes the value of j; The value of w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) is 1, and w f (1) is j, and w f (2) is -1, and w f (3) is -j; w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) takes the value of 1, w f (1) takes the value of -j, w f (2) takes the value of -1, w f (3) takes the value of j; The value of w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) is 1, and the value of w f (1) is j, and the value of w f (2) is -1, and the value of w f (3) is -j; The value of w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) is 1, and the value of w f (1) is -j, and the value of w f (2) is -1, and the value of w f (3) is j.

27. The communication device according to claim 26, wherein, The index value of the first DMRS port is 8, the index value of the second DMRS port is 9, the index value of the third DMRS port is 10, the index value of the fourth DMRS port is 11, the index value of the fifth DMRS port is 12, the index value of the sixth DMRS port is 13, the index value of the seventh DMRS port is 14, and the index value of the eighth DMRS port is 15.

28. The communication device according to any one of claims 25-27, wherein, The correspondence relationship between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

29. The communication device according to claim 25, wherein, The DMRS port index includes at least one of a first DMRS port index, a second DMRS port index, a third DMRS port index, a fourth DMRS port index, a fifth DMRS port index, a sixth DMRS port index, a seventh DMRS port index, an eighth DMRS port index, a ninth DMRS port index, a tenth DMRS port index, an eleventh DMRS port index, a twelfth DMRS port index, a thirteenth DMRS port index, a fourteenth DMRS port index, a fifteenth DMRS port index, and a sixteenth DMRS port index; The frequency-domain OCC includes four codes, which are w f (0), w f (1), w f (2), and w f (3); w in the frequency-domain OCC corresponding to the first DMRS port index f (0) takes the value of 1, w f (1) takes the value of 1, w f (2) takes the value of 1, w f (3) takes the value of 1; w in the frequency-domain OCC corresponding to the second DMRS port index f (0) takes a value of 1, w f (1) takes a value of -1, w f (2) takes a value of 1, w f (3) takes a value of -1; The value of w in the frequency-domain OCC corresponding to the third DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; The w in the frequency-domain OCC corresponding to the fourth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of 1, and w f (3) takes the value of -1; The w in the frequency-domain OCC corresponding to the fifth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of 1, and w f (3) takes the value of 1; The value of w in the frequency-domain OCC corresponding to the sixth DMRS port index f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is 1, and the value of w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the seventh DMRS port index f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is 1, and the value of w f (3) is 1; The value of w in the frequency-domain OCC corresponding to the index of the eighth DMRS port f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is 1, and the value of w f (3) is -1; The value of w in the frequency-domain OCC corresponding to the index of the ninth DMRS port f (0) is 1, and the value of w f (1) is 1, and the value of w f (2) is -1, and the value of w f (3) is -1; The w in the frequency-domain OCC corresponding to the tenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The w in the frequency-domain OCC corresponding to the index of the eleventh DMRS port f (0) takes a value of 1, and w f (1) takes a value of 1, and w f (2) takes a value of -1, and w f (3) takes a value of -1; The value of w in the frequency-domain OCC corresponding to the twelfth DMRS port index f (0) is 1, and the value of w f (1) is -1, and the value of w f (2) is -1, and the value of w f (3) is 1; The w in the frequency-domain OCC corresponding to the index of the thirteenth DMRS port f (0) takes a value of 1, and w f (1) takes a value of 1, and w f (2) takes a value of -1, and w f (3) takes a value of -1; The w in the frequency-domain OCC corresponding to the fourteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of -1, and w f (2) takes the value of -1, and w f (3) takes the value of 1; The w in the frequency-domain OCC corresponding to the fifteenth DMRS port index f (0) takes the value of 1, and w f (1) takes the value of 1, and w f (2) takes the value of -1, and w f (3) takes the value of -1; The value of w in the frequency-domain OCC corresponding to the index of the sixteenth DMRS port f (0) is 1, and w f (1) is -1, and w f (2) is -1, and w f (3) is 1.

30. The communication device according to claim 25 or 29, wherein, The correspondence relationship between the DMRS port index, the CDM group index, the frequency-domain OCC, and the time-domain OCC satisfies: Among them, is the DMRS port index, λ is the CDM group index, Δ is the CDM group frequency domain offset, and W f (k′) is the frequency domain OCC, and W t (l′) is the time domain OCC.

31. The communication device according to any one of claims 25-27, 29, wherein, The first information is indicated by dedicated control information DCI or high-layer signaling.

32. The communication device according to any one of claims 25-27, 29, wherein,The device further performs: Obtain the data of the DMRS on the resource element RE(k, l) according to the CDM group index, the frequency-domain OCC, and the time-domain OCC.

33. A chip, characterized in that, The chip is coupled to the memory and is configured to read and execute program instructions stored in the memory to implement the method according to any one of claims 1-16.

34. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and when the instructions are run on a computer, the computer is caused to execute the method according to any one of claims 1-16.

35. A computer program product, characterized in that, When the computer program product is called by a computer, the computer is caused to execute the method according to any one of claims 1-16.

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