Signal transmission method and device

Abstract

A signal transmission method and apparatus. The method comprises the following steps: a sending device generates a sequence of a demodulation reference signal, and maps the sequence of the demodulation reference signal to a time-frequency resource of the demodulation reference signal for sending. The demodulation reference signal is used for estimating the channel state of a first channel, and the first channel is used for bearing uplink data. The time-frequency resources comprise frequency domain resources corresponding to a first CDM group, and the frequency domain resources corresponding to the first CDM group are discontinuous and are arranged at equal intervals; the first PRB in the frequency domain resource corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers, each of the first group of subcarriers and the second group of subcarriers comprises two 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 and the second group of OCCs are orthogonal.

Description

[0001] This application is a divisional application. The application number of the original application is 202110286619.3, and the original application date is March 17, 2021. The entire content of the original application is incorporated into this application by reference.

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on August 14, 2020, with application number 202010821303.5 and invention name “Signal Transmission Method and Device”, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present application relates to the field of mobile communication technology, and in particular to a signal transmission method and device. Background Art

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

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

[0006] In the current NR protocol, the DFT-S-OFDM waveform can support up to 8 orthogonal DMRS ports, which means it can support 8 layers of multi-user orthogonal pairing. The CP-OFDM waveform can support up to 12 orthogonal DMRS ports, which means it can support 12 layers of multi-user orthogonal pairing. If the number of pairing layers exceeds the maximum number of multi-user orthogonal pairing layers supported by the corresponding waveform (for example, when the DFT-S-OFDM waveform is used, the number of pairing layers exceeds 8 layers, or when the CP-OFDM waveform is used, the number of pairing layers exceeds 12 layers), the DMRS ports will not be orthogonal, thereby introducing pilot interference, making the DMRS channel estimation inaccurate and affecting the PUSCH demodulation performance.

[0007] With the development of mobile communications and the emergence of emerging services, the demand for uplink capacity is increasing. For example, in some video surveillance scenarios, terminal devices must transmit high-definition video back to the base station. At the same time, the number of transmission layers must exceed the maximum number of multi-user orthogonal pairing layers currently supported by the system to increase transmission capacity and meet future high-capacity requirements. Summary of the Invention

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

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

[0010] The transmitting device generates a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate a channel state of a first channel;

[0011] The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it; the time-frequency resources include frequency domain resources corresponding to a first code division multiplexing (CDM) group, wherein 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 respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spread spectrum 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.

[0012] In the above-mentioned embodiment of the present application, the subcarriers on the first PRB in 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 the different demodulation reference signal ports in the first CDM group are ensured to be mutually orthogonal through the OCC, the OCC is expanded through the above-mentioned embodiment of the present application. It is possible to increase the number of mutually orthogonal demodulation reference signal ports in the first CDM group without additionally increasing the time-frequency resource overhead of the demodulation reference signal, thereby improving the system transmission capacity.

[0013] In one possible design, the first PRB also 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 one 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, wherein 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-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, the frequency domain OCC in the configuration information table is expanded into a first group of OCCs and a second group of OCCs that are mutually orthogonal. In this way, when the time domain OCC and the frequency domain OCC are queried according to the configuration information table in order to map the demodulation reference signal sequence to the corresponding time-frequency resources, the first group of subcarriers on the first PRB in the frequency domain resources corresponding to the first CDM group can use the first group of OCCs, and the second group of subcarriers can use the second group of OCCs, 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 one 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 a 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;

[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 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, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

[0019] In the above-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, expanded into a first configuration information table and a second configuration information table, and the frequency domain OCC in the second configuration information table is expanded into a first group of OCCs and a second group of OCCs that are mutually orthogonal. 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 in order to map the demodulation reference signal sequence to the corresponding time-frequency resources, the corresponding configuration information table can be queried 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 uses the first group of OCCs, and the second group of subcarriers uses the second group of OCCs, 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] One possible design also includes: the sending device obtains 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 according to the configuration information table.

[0021] In one possible design, the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal, including:

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

[0023] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[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] Among them, 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; wherein, when t=0, the frequency domain OCC is the first group of OCCs; t=1, the frequency domain OCC is the second group of OCCs.

[0032] In the above-mentioned embodiments of the present application, the above-mentioned mapping formula of the demodulation reference signal can be used in conjunction with the expanded demodulation reference signal configuration information table in the above-mentioned embodiments to realize the mapping of the demodulation reference signal to the time-frequency resources, and can ensure the orthogonality of each demodulation reference signal port in the first CDM group.

[0033] A possible design also includes: the sending device sending indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0034] In one 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 the above embodiments of the present application are applied to a DMRS configured with a Type 1 DMRS, one CDM group can support 8 orthogonal DMRS ports, and two CDM groups can support a total of 16 orthogonal DMRS ports without increasing the DMRS overhead, thereby achieving 16 layers of orthogonal multi-user pairing and effectively improving system capacity.

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

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

[0038] The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it; the time-frequency resources include frequency domain resources corresponding to the first CDM group, wherein 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-described 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. Because the different demodulation reference signal ports within the first CDM group are mutually orthogonalized by the OCCs, the expansion of the OCCs through the above-described embodiments of the present application can increase the number of mutually orthogonal demodulation reference signal ports within the first CDM group without additionally increasing the time-frequency resource overhead of the demodulation reference signal, thereby improving the system transmission capacity.

[0040] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

[0041] In the above-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, the time domain OCC in the configuration information table is expanded into a first group of OCCs and a second group of OCCs that are mutually orthogonal. In this way, when the time domain OCCs and the frequency domain OCCs are queried according to the configuration information table in order 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 OCCs, and the second group of symbols can use the second group of OCCs, 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 one possible design, the demodulation reference signal configuration information table 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;

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

[0044] The second information configuration table includes a 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 time domain OCC is the second group of OCCs.

[0045] In the above-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, expanded 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 OCCs, and the time 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 in order 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, the first configuration information table is queried according to the first demodulation reference signal type to obtain the first group of OCCs for the first group of symbols, and the second configuration information table is queried 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.

[0046] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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 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.

[0047] In the above-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, the frequency domain OCC in the configuration information table is expanded into a first group of OCCs and a second group of OCCs that are mutually orthogonal. In this way, when the time domain OCC and the frequency domain OCC are queried according to the configuration information table in order 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 OCCs, and the second group of symbols can use the second group of OCCs, 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 one possible design, the demodulation reference signal configuration information table 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;

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

[0051] In the above-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, expanded 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 in order 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, the first configuration information table is queried according to the first demodulation reference signal type to obtain the first group of OCCs for the first group of symbols, and the second configuration information table is queried 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] One possible design also includes: the transmitting 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.

[0053] In one possible design, the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal, including:

[0054] The transmitting device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein 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, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[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] Among them, 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; when s=0, the time domain OCC is the first group of OCCs; when s=1, the time domain OCC is the second group of OCCs.

[0064] In the above-mentioned embodiments of the present application, the above-mentioned mapping formula of the demodulation reference signal can be used in conjunction with the expanded demodulation reference signal configuration information table in the above-mentioned embodiments to realize the mapping of the demodulation reference signal to the time-frequency resources, and can ensure the orthogonality of each demodulation reference signal port in the first CDM group.

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

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

[0067] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[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] Among them, 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; 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.

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

[0077] One possible design also includes: the sending device sending the port index indication information of the demodulation reference signal to the terminal.

[0078] In one 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 contained in the first group of symbols or the second group of symbols, and the number of symbols contained in the first group of symbols and the second group of symbols is the same.

[0079] 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 a DMRS configured with a Type 1 DMRS, one CDM group can support 8 orthogonal DMRS ports, and two CDM groups can support a total of 16 orthogonal DMRS ports without increasing the DMRS overhead, thereby achieving 16 layers of orthogonal multi-user pairing and effectively improving system capacity.

[0080] According to a third aspect, a signal transmission method is provided, comprising:

[0081] The transmitting device generates a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate a channel state of a first channel;

[0082] The sending device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal and sends it;

[0083] in:

[0084] The time-frequency resources include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of a demodulation reference signal in a 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, a 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, 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;

[0085] The orthogonal spread spectrum OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the first port forms a first OCC code sequence, the OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the second port forms a second OCC code sequence, the OCC code used on the REs corresponding to two subcarriers in the first subcarrier group by the frequency domain resources corresponding to the first port or the second port forms a third OCC code sequence, and the OCC code used on the REs corresponding to two subcarriers in the second subcarrier group forms a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by cyclic shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0086] In the above-mentioned embodiment of the present application, the OCC used on the frequency domain resources corresponding to the first port of the demodulation reference signal in the first CDM group on the RE corresponding to the above-mentioned subcarrier group forms a first OCC code sequence, and the OCC used on the frequency domain resources corresponding to the second port of the demodulation reference signal in the first CDM group on the RE corresponding to the above-mentioned subcarrier group forms a second OCC code sequence. The second OCC code sequence is obtained by cyclically shifting the first OCC code sequence, so that the OCC of some demodulation reference signal ports can be cyclically shifted to obtain orthogonal OCCs, and the OCC code sequence obtained by the cyclic shift is used for other demodulation reference signal ports. Since different demodulation reference signal ports in the first CDM group are guaranteed to be orthogonal to each other through OCC, the OCC is expanded through the above-mentioned embodiment of the present application. The number of mutually orthogonal demodulation reference signal ports in the first CDM group can be increased without additionally increasing the time-frequency resource overhead of the demodulation reference signal, thereby improving the system transmission capacity.

[0087] In one possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, CDM group frequency domain offset, OCC and cyclic shift factor, wherein the OCC includes frequency domain OCC and time domain OCC.

[0088] In the above-mentioned embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, a cyclic shift factor is introduced into the configuration information table. In this way, when the time domain OCC and the frequency domain OCC are queried according to the configuration information table in order 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 OCCs, thereby ensuring the orthogonality between the demodulation reference signal ports in the first CDM group.

[0089] One possible design also includes: the sending 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 cyclically shifts the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0090] In one possible design, the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal, including:

[0091] The transmitting device obtains, 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), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0092] According to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0093]

[0094] k=4n+2k′+Δ

[0095] k′=0,1

[0096]

[0097]

[0098] n=0,1,…

[0099] j=0,1,…,v-1

[0100] Alternatively, the data mapped on the first RE (k, l) satisfy:

[0101]

[0102] k=4n+2k′+Δ

[0103] k′=0,1

[0104]

[0105]

[0106] n=0,1,…

[0107] j=0,1,…,v-1

[0108] Among them, 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.

[0109] In the above-mentioned embodiments of the present application, the above-mentioned mapping formula of the demodulation reference signal can be used in conjunction with the expanded demodulation reference signal configuration information table in the above-mentioned embodiments to realize the mapping of the demodulation reference signal to the time-frequency resources, and can ensure the orthogonality of each demodulation reference signal port in the first CDM group.

[0110] A possible design also includes: the sending device sending indication information of the demodulation reference signal port index in the first CDM group to the receiving device.

[0111] In one 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.

[0112] 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 the above-mentioned embodiments of the present application are applied to a DMRS with a configuration type of Type 1DMRS, one CDM group can support 8 DMRS ports orthogonal without increasing the DMRS overhead, and two CDM groups can support a total of 16 DMRS ports orthogonal, thereby realizing 16-layer orthogonal multi-user pairing, effectively improving the system capacity. For another example, when the above-mentioned embodiments of the present application are applied to a DMRS with a configuration type of Type 1DMRS, one CDM group can support 12 DMRS ports orthogonal without increasing the DMRS overhead, and two CDM groups can support a total of 24 DMRS ports orthogonal, thereby realizing 24-layer orthogonal multi-user pairing, effectively improving the system capacity.

[0113] In a fourth aspect, a signal transmission method is provided, comprising:

[0114] The receiving device receives, on a time-frequency resource of the demodulation reference signal, a demodulation reference signal sent by a transmitting device, where the demodulation reference signal is used to estimate a channel state of a first channel; the time-frequency resource includes a frequency domain resource corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; a first PRB in the frequency domain resource 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 two 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;

[0115] The receiving device obtains a sequence of the demodulation reference signal.

[0116] In one possible design, the first PRB also 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.

[0117] In one 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, wherein 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.

[0118] In one possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

[0119] The first configuration information table includes a 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;

[0120] 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 OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

[0121] One possible design also includes: the receiving device obtains 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 according to the configuration information table.

[0122] In one possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0123] The receiving device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0124] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0125]

[0126] k=4n+2k′+Δ

[0127] k′=0,1

[0128] t=mod(n,2)

[0129]

[0130] n=0,1,…

[0131] j=0,1,…,v-1

[0132] Among them, 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; wherein, when t=0, the frequency domain OCC is the first group of OCCs; t=1, the frequency domain OCC is the second group of OCCs.

[0133] One possible design also includes: the receiving device receives indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0134] In one 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.

[0135] In a fifth aspect, a signal transmission method is provided, comprising:

[0136] The receiving device receives, on a time-frequency resource of the demodulation reference signal, a demodulation reference signal sent by the transmitting device, where the demodulation reference signal is used to estimate a channel state of a first channel; the time-frequency resource includes a frequency domain resource corresponding to a first CDM group, wherein 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 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;

[0137] The receiving device obtains a sequence of the demodulation reference signal.

[0138] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

[0139] In one possible design, the demodulation reference signal configuration information table 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;

[0140] The first configuration information table includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC including a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs;

[0141] The second information configuration table includes a 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 time domain OCC is the second group of OCCs.

[0142] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein the OCC includes the frequency domain OCC and the 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.

[0143] In one possible design, the demodulation reference signal configuration information table 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;

[0144] The first configuration information table includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC including a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs;

[0145] The second information configuration table includes a 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, and the frequency domain OCC is the second group of OCCs.

[0146] One possible design also 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.

[0147] In one possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0148] The receiving device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0149] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0150]

[0151] k=4n+2k′+Δ

[0152] k′=0,1

[0153] s=0,1

[0154]

[0155] n=0,1,…

[0156] j=0,1,…,v-1

[0157] Among them, 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; when s=0, the time domain OCC is the first group of OCCs; when s=1, the time domain OCC is the second group of OCCs.

[0158] In one possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0159] The receiving device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0160] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0161]

[0162] k=4n+2k′+Δ

[0163] k′=0,1

[0164] s=0,1

[0165]

[0166] n=0,1,…

[0167] j=0,1,…,v-1

[0168] Among them, 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; 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.

[0169] One possible design also includes: the receiving device receiving port index indication information of the demodulation reference signal sent by the sending device.

[0170] In one 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 contained in the first group of symbols or the second group of symbols, and the number of symbols contained in the first group of symbols and the second group of symbols is the same.

[0171] In a sixth aspect, a signal transmission method is provided, comprising:

[0172] The receiving device receives a demodulation reference signal sent by the sending device on a time-frequency resource of the demodulation reference signal, where the demodulation reference signal is used to estimate a channel state of the first channel;

[0173] The receiving device obtains a sequence of the demodulation reference signal;

[0174] in:

[0175] The time-frequency resources include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of a demodulation reference signal in a 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, a 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, 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;

[0176] The orthogonal spread spectrum OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the first port forms a first OCC code sequence, the OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the second port forms a second OCC code sequence, the OCC code used on the REs corresponding to two subcarriers in the first subcarrier group by the frequency domain resources corresponding to the first port or the second port forms a third OCC code sequence, and the OCC code used on the REs corresponding to two subcarriers in the second subcarrier group forms a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by cyclic shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0177] In one possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, CDM group frequency domain offset, OCC and cyclic shift factor, wherein the OCC includes frequency domain OCC and time domain OCC.

[0178] One possible design also 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 cyclically shifts the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0179] In one possible design, the receiving device obtains the sequence of the demodulation reference signal, including:

[0180] The receiving device obtains, 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), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0181] According to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0182]

[0183] k=4n+2k′+Δ

[0184] k′=0,1

[0185]

[0186]

[0187] n=0,1,…

[0188] j=0,1,…,v-1

[0189] Alternatively, the data mapped on the first RE (k, l) satisfy:

[0190]

[0191] k=4n+2k′+Δ

[0192] k′=0,1

[0193]

[0194]

[0195] n=0,1,…

[0196] j=0,1,…,v-1

[0197] Among them, 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.

[0198] One possible design also includes: the receiving device receives indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0199] In one 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.

[0200] In a seventh aspect, a communication device is provided, comprising at least one processor connected to a memory, the at least one processor being configured to read and execute a program stored in the memory, so that the device performs:

[0201] generating a sequence of demodulation reference signals, wherein the demodulation reference signals are used to estimate a channel state of a first channel;

[0202] The sequence of the demodulation reference signal is mapped to the time-frequency resources of the demodulation reference signal and sent; the time-frequency resources include frequency domain resources corresponding to a first code division multiplexing (CDM) group, wherein 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 respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spread spectrum 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.

[0203] In one possible design, the first PRB also 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.

[0204] In one 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, wherein 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.

[0205] In one possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

[0206] The first configuration information table includes a 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;

[0207] 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 OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

[0208] One possible design also includes: obtaining 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 according to the configuration information table.

[0209] In one possible design, mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal includes:

[0210] Obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0211] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0212]

[0213] k=4n+2k′+Δ

[0214] k′=0,1

[0215] t=mod(n,2)

[0216]

[0217] n=0,1,…

[0218] j=0,1,…,v-1

[0219] Among them, W f (k′+2t) is the frequency domain OCC, Wt (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; wherein, when t=0, the frequency domain OCC is the first group of OCCs; t=1, the frequency domain OCC is the second group of OCCs.

[0220] One possible design also includes: sending indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

[0221] In one 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.

[0222] In an eighth aspect, a communication device is provided, comprising at least one processor connected to a memory, the at least one processor being configured to read and execute a program stored in the memory, so that the device performs:

[0223] generating a sequence of demodulation reference signals, wherein the demodulation reference signals are used to estimate a channel state of a first channel;

[0224] The sequence of the demodulation reference signal is mapped to the time-frequency resources of the demodulation reference signal and sent; the time-frequency resources include frequency domain resources corresponding to the first CDM group, wherein 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.

[0225] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

[0226] In one possible design, the demodulation reference signal configuration information table 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;

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

[0228] The second information configuration table includes a 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 time domain OCC is the second group of OCCs.

[0229] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein the OCC includes the frequency domain OCC and the 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.

[0230] In one possible design, the demodulation reference signal configuration information table 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;

[0231] The first configuration information table includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC including a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs;

[0232] The second information configuration table includes a 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, and the frequency domain OCC is the second group of OCCs.

[0233] A possible design also includes: obtaining 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.

[0234] In one possible design, mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal includes:

[0235] Obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0236] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0237]

[0238] k=4n+2k′+Δ

[0239] k′=0,1

[0240] s=0,1

[0241]

[0242] n=0,1,…

[0243] j=0,1,…,v-1

[0244] Among them, 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; when s=0, the time domain OCC is the first group of OCCs; when s=1, the time domain OCC is the second group of OCCs.

[0245] In one possible design, mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal includes:

[0246] Obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0247] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0248]

[0249] k=4n+2k′+Δ

[0250] k′=0,1

[0251] s=0,1

[0252]

[0253] n=0,1,…

[0254] j=0,1,…,v-1

[0255] Among them, 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; 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.

[0256] A possible design also includes: sending the port index indication information of the demodulation reference signal to the terminal.

[0257] In one 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 contained in the first group of symbols or the second group of symbols, and the number of symbols contained in the first group of symbols and the second group of symbols is the same.

[0258] In a ninth aspect, a communication device is provided, comprising at least one processor connected to a memory, the at least one processor being configured to read and execute a program stored in the memory, so that the device performs:

[0259] generating a sequence of demodulation reference signals, wherein the demodulation reference signals are used to estimate a channel state of a first channel;

[0260] Mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sending it; the time-frequency resources include 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;

[0261] in:

[0262] The time-frequency resources include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of a demodulation reference signal in a 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, a 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, 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;

[0263] The orthogonal spread spectrum OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the first port forms a first OCC code sequence, the OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the second port forms a second OCC code sequence, the OCC code used on the REs corresponding to two subcarriers in the first subcarrier group by the frequency domain resources corresponding to the first port or the second port forms a third OCC code sequence, and the OCC code used on the REs corresponding to two subcarriers in the second subcarrier group forms a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by cyclic shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0264] In one possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, CDM group frequency domain offset, OCC and cyclic shift factor, wherein the OCC includes frequency domain OCC and time domain OCC.

[0265] A possible design also includes: obtaining 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 cyclically shifting the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0266] In one possible design, mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal includes:

[0267] 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), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0268] According to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0269]

[0270] k=4n+2k′+Δ

[0271] k′=0,1

[0272]

[0273]

[0274] n=0,1,…

[0275] j=0,1,…,v-1

[0276] Alternatively, the data mapped on the first RE (k, l) satisfy:

[0277]

[0278] k=4n+2k′+Δ

[0279] k′=0,1

[0280]

[0281]

[0282] n=0,1,…

[0283] j=0,1,…,v-1

[0284] Among them, 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.

[0285] One possible design also includes: sending indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

[0286] In one 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.

[0287] In a tenth aspect, a communication device is provided, comprising at least one processor connected to a memory, the at least one processor being configured to read and execute a program stored in the memory, so that the device performs:

[0288] Receiving a demodulation reference signal sent by a transmitting device on a time-frequency resource of a demodulation reference signal, where the demodulation reference signal is used to estimate a channel state of a first channel; the time-frequency resource includes a frequency domain resource corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; a first PRB in the frequency domain resource 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 two 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;

[0289] A sequence of the demodulation reference signal is obtained.

[0290] In one possible design, the first PRB also 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.

[0291] In one 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, wherein 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.

[0292] In one possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

[0293] The first configuration information table includes a 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;

[0294] 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 OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

[0295] One possible design also includes: obtaining 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 according to the configuration information table.

[0296] In one possible design, obtaining the sequence of the demodulation reference signal includes:

[0297] Obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0298] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0299]

[0300] k=4n+2k′+Δ

[0301] k′=0,1

[0302] t=mod(n,2)

[0303]

[0304] n=0,1,…

[0305] j=0,1,…,v-1

[0306] Among them, 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; wherein, when t=0, the frequency domain OCC is the first group of OCCs; t=1, the frequency domain OCC is the second group of OCCs.

[0307] One possible design also includes: receiving indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0308] In one 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.

[0309] In an eleventh aspect, a communication device is provided, comprising at least one processor connected to a memory, the at least one processor being configured to read and execute a program stored in the memory, so that the device performs:

[0310] Receiving a demodulation reference signal sent by a transmitting device on a time-frequency resource of a demodulation reference signal, where the demodulation reference signal is used to estimate a channel state of a first channel; the time-frequency resource includes frequency domain resources corresponding to a first CDM group, wherein 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;

[0311] A sequence of the demodulation reference signal is obtained.

[0312] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

[0313] In one possible design, the demodulation reference signal configuration information table 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;

[0314] The first configuration information table includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC including a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs;

[0315] The second information configuration table includes a 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 time domain OCC is the second group of OCCs.

[0316] In one possible design, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein the OCC includes the frequency domain OCC and the 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.

[0317] In one possible design, the demodulation reference signal configuration information table 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;

[0318] The first configuration information table includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC including a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs;

[0319] The second information configuration table includes a 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, and the frequency domain OCC is the second group of OCCs.

[0320] A possible design also includes: obtaining 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.

[0321] In one possible design, obtaining the sequence of the demodulation reference signal includes:

[0322] Obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0323] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0324]

[0325] k=4n+2k′+Δ

[0326] k′=0,1

[0327] s=0,1

[0328]

[0329] n=0,1,…

[0330] j=0,1,…,v-1

[0331] Among them, 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; when s=0, the time domain OCC is the first group of OCCs; when s=1, the time domain OCC is the second group of OCCs.

[0332] In one possible design, obtaining the sequence of the demodulation reference signal includes:

[0333] Obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0334] According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0335]

[0336] k=4n+2k′+Δ

[0337] k′=0,1

[0338] s=0,1

[0339]

[0340] n=0,1,…

[0341] j=0,1,…,v-1

[0342] Among them, 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; 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.

[0343] One possible design also includes: receiving port index indication information of the demodulation reference signal sent by the sending device.

[0344] In one 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 contained in the first group of symbols or the second group of symbols, and the number of symbols contained in the first group of symbols and the second group of symbols is the same.

[0345] In a twelfth aspect, a communication device is provided, comprising at least one processor connected to a memory, the at least one processor being configured to read and execute a program stored in the memory, so that the device performs:

[0346] receiving, on a time-frequency resource of a demodulation reference signal, a demodulation reference signal sent by a transmitting device, where the demodulation reference signal is used to estimate a channel state of a first channel;

[0347] Obtaining a sequence of the demodulation reference signal;

[0348] in:

[0349] The time-frequency resources include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of a demodulation reference signal in a 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, a 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, 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;

[0350] The orthogonal spread spectrum OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the first port forms a first OCC code sequence, the OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the second port forms a second OCC code sequence, the OCC code used on the REs corresponding to two subcarriers in the first subcarrier group by the frequency domain resources corresponding to the first port or the second port forms a third OCC code sequence, and the OCC code used on the REs corresponding to two subcarriers in the second subcarrier group forms a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by cyclic shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0351] In one possible design, the configuration information table of the demodulation reference signal includes the correspondence between the demodulation reference signal port index, CDM group frequency domain offset, OCC and cyclic shift factor, wherein the OCC includes frequency domain OCC and time domain OCC.

[0352] A possible design also includes: obtaining 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 cyclically shifting the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0353] In one possible design, obtaining the sequence of the demodulation reference signal includes:

[0354] 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), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0355] According to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy:

[0356]

[0357] k=4n+2k′+Δ

[0358] k′=0,1

[0359]

[0360]

[0361] n=0,1,…

[0362] j=0,1,…,v-1

[0363] Alternatively, the data mapped on the first RE (k, l) satisfy:

[0364]

[0365] k=4n+2k′+Δ

[0366] k′=0,1

[0367]

[0368]

[0369] n=0,1,…

[0370] j=0,1,…,v-1

[0371] Among them, 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 equal to or greater than 1.

[0372] One possible design also includes: receiving indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

[0373] In one 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.

[0374] In a thirteenth aspect, a chip is provided, which is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method as described in any one of the first to sixth aspects above.

[0375] In the fourteenth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions. When the instructions are executed on a computer, the computer executes the method as described in any one of the first to sixth aspects above.

[0376] In a fifteenth aspect, a computer program product is provided, which, when called by a computer, enables the computer to execute the method as described in any one of the first to sixth aspects above. BRIEF DESCRIPTION OF THE DRAWINGS

[0377] Figure 1 A schematic diagram of a network architecture provided in an embodiment of the present application;

[0378] Figure 2 Schematic diagram of the DMRS pilot pattern in an embodiment of the present application;

[0379] Figure 3 A flowchart of a demodulation reference signal transmission method implemented on a transmitting device side provided in an embodiment of the present application;

[0380] Figure 4 Schematic diagram of the correspondence between DMRS time-frequency resources and subcarrier groups and OCC groups in an embodiment of the present application;

[0381] Figure 5 Schematic diagram of DMRS time-frequency resources and OCC corresponding to ports in CDM group 0 in an embodiment of the present application;

[0382] Figure 6 A flowchart of a demodulation reference signal transmission method implemented on a receiving device side provided in an embodiment of the present application;

[0383] Figure 7 A flowchart of a demodulation reference signal transmission method implemented on a transmitting device side provided in an embodiment of the present application;

[0384] Figure 8 Schematic diagram of the correspondence between DMRS time-frequency resources and symbol groups and OCC groups in an embodiment of the present application;

[0385] Figure 9Schematic diagram of DMRS time-frequency resources and OCC corresponding to ports in CDM group 0 in an embodiment of the present application;

[0386] Figure 10 A flowchart of a demodulation reference signal transmission method implemented on a receiving device side provided in an embodiment of the present application;

[0387] Figure 11 A flowchart of a demodulation reference signal transmission method implemented on a transmitting device side provided in an embodiment of the present application;

[0388] Figure 12 Schematic diagram of the OCC code used when mapping DMRS to RE in an embodiment of the present application;

[0389] Figure 13 A flowchart of a demodulation reference signal transmission method implemented on a receiving device side provided in an embodiment of the present application;

[0390] Figure 14 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0391] Figure 15 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0392] Figure 16 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0393] Figure 17 A schematic structural diagram of a communication device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0394] In order to make the purpose, 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.

[0395] Below, some terms used in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0396] 1) Terminal devices, including devices that provide voice and / or data connectivity to users, may include, for example, handheld devices with wireless connectivity, or processing devices connected to wireless modems. The terminal devices can communicate with the core network via the radio access network (RAN), exchanging voice and / or data with the RAN. The terminal devices may include user equipment (UE), wireless terminal devices, mobile terminal devices, subscriber units (SUs), subscriber stations (SSs), mobile stations (MSs), mobile stations (MSs), remote stations (MSs), access points (APs), remote terminals (RTs), access terminals (ATs), user terminals (UEs), user agents (UAs), or user devices. For example, they may include mobile phones (also known as "cellular" phones), computers with mobile terminal devices, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices, smart wearable devices, etc. Examples include personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), and other devices. Also included are limited devices, such as those with low power consumption, limited storage capacity, or limited computing power. Examples include information sensing devices such as barcode scanners, radio frequency identification (RFID), sensors, global positioning systems (GPS), and laser scanners.

[0397] As an example and not a limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are designed and developed using wearable technology for intelligent everyday wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0398] 2) Network equipment, for example, including access network (AN) equipment, such as a base station (e.g., an access point), can refer to a device in an access network that communicates with a wireless terminal device over an air interface through one or more cells. The network equipment can be used to convert received air frames into and out of Internet Protocol (IP) packets, acting 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 equipment can also coordinate attribute management of the air interface. For example, the network equipment can include an evolved base station (NodeB or eNB or e-NodeB, evolutionary NodeB) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), or can also include a next generation node B (gNB) in a fifth generation mobile communication technology (5G) new radio (NR) system, or can also include a centralized unit (CU) and a distributed unit (DU) in a cloud radio access network (CloudRAN) system, but the embodiments of the present application are not limited thereto.

[0399] 3) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" refers to two or more. In view of this, "multiple" can also be understood as "at least two" in the embodiments of the present application. "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then the included ones may be A, B, C, A and B, A and C, B and C, or A and B and C. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0400] Unless otherwise specified, ordinal numbers such as "first" and "second" in the embodiments of the present application are used to distinguish multiple objects and are not used to limit the order, timing, priority or importance of multiple objects.

[0401] The embodiments of the present application can be applied to various communication systems, for example, LTE systems, LTE-A systems, NR systems, or new communication systems that will emerge in future communication developments. 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, thereby increasing the number of orthogonal demodulation reference signal ports supported by the system, the communication method provided in the embodiments of the present application can be used.

[0402] See also Figure 1 As shown in FIG, a communication system applicable to the embodiment of the present application is shown. Figure 1 The communication system shown includes a network device 101 and four terminal devices (102a~102d). The network device 101 can send downlink data and DMRS to the terminal devices (102a~102d). Any terminal device among the terminal devices (102a~102d) can perform downlink channel estimation based on the received DMRS, and send DMRS and uplink data to the network device 101. The network device performs uplink channel estimation based on the received DMRS.

[0403] The network device 101 is used to receive uplink signals from terminal devices (102a-102d) or send downlink signals to the terminal devices. The network device 101 can be an LTE and / or NR network device, specifically 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.

[0404] Terminal devices (102a-102d) are user-side entities used to receive or transmit signals, sending uplink signals to network devices or receiving downlink signals from network devices. Terminal devices (102a-102d) primarily include mobile phones, cars, tablets, smart speakers, train detectors, gas station sensors, and more. Their primary functions include collecting data (partially for terminal devices), receiving control information and downlink data from network devices, and transmitting electromagnetic waves to transmit uplink data to network devices.

[0405] Figure 1 This is only an example and does not limit the type of communication system or the number and type of devices included in the communication system. The network architecture and service scenarios described in the embodiments of this application are intended to illustrate the technical solutions of the embodiments of this application and do not limit the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of network architecture and the emergence of new service scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0406] based on Figure 1 The communication system shown takes the NR system as an example. In the current NR protocol, the DFT-S-OFDM waveform can support up to 8 orthogonal DMRS ports, that is, it can support 8-layer multi-user orthogonal pairing. The CP-OFDM waveform can support up to 12 orthogonal DMRS ports, that is, it can support 12-layer multi-user orthogonal pairing. For the CP-OFDM waveform, the system supports two DMRS configuration types, 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 has a higher frequency domain density than Type 2 DMRS.

[0407] 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 of 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 in the same CDM group, orthogonal cover codes (OCC) are used for expansion in the time and frequency domains, and the orthogonality of 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 subcarriers.

[0408] Here, two sequences or vectors are orthogonal if the inner product of the two sequences or vectors is equal to 0.

[0409] Figure 2 The example shows the time-frequency resource positions (i.e., DMRS pilot patterns) of DMRS using the first configuration type (Type 1 DMRS), where resource elements (REs) indicated by different filling patterns belong to different CDM groups. p0, p1, ..., p7 represent DMRS port indexes.

[0410] like Figure 2 As shown in the figure, for Type 1DMRS, when one symbol is configured for DMRS transmission, sequence cyclic shift or frequency domain OCC is used in the frequency domain to ensure sequence orthogonality on the two DMRS ports in the same CDM group; when two symbols are configured for DMRS transmission, frequency domain cyclic shift or frequency domain OCC (code length is 2) and time domain OCC (code length is 2) are used in the same CDM group to ensure sequence orthogonality on the four DMRS ports in the CDM group.

[0411] from Figure 2 As can be seen in the figure, Type 1 DMRS includes two CDM groups and can only support a maximum of eight orthogonal DMRS ports. If the number of network pairing layers exceeds eight (for example, reaching 16 layers), the orthogonality of the DMRS ports cannot be guaranteed, resulting in a decrease in channel estimation performance, affecting PUSCH demodulation performance, and hindering the improvement of uplink capacity. Similarly, downlink DMRS transmission also faces the above issues.

[0412] To address the aforementioned issues, embodiments of the present application provide a signal transmission method and apparatus for increasing the number of orthogonal demodulation reference signal (ODRS) ports supported by a system without increasing the DRS overhead. The method and apparatus are based on the same inventive concept. Since the principles underlying the problems solved by the method and apparatus are similar, their implementations can be referenced to each other, and any repetitions will not be repeated.

[0413] The embodiments of the present application are applicable to the transmission of downlink demodulation reference signals, and are also applicable to the transmission of uplink demodulation reference signals.

[0414] See Figure 3 FIG. 1 is a flow chart of a signal transmission method implemented on the transmitting device side according to an embodiment of the present application. The method can be applied to Figure 1 The network architecture shown in the figure can also be applied to other network architectures, and this application does not limit this. Figure 1In 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 the method may be a receiving device Figure 1 For uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 The terminal device (102a-102d) in the method may be a receiving device Figure 1 The network device 101 in FIG.

[0415] See Figure 3 As shown, the method may include the following processing flow:

[0416] S301: The transmitting device generates a sequence of a demodulation reference signal.

[0417] The demodulation reference signal is used to estimate the channel state of the first channel. The demodulation reference signal is used to estimate the channel state of the first channel, which can be understood as the demodulation reference signal being 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.

[0418] Specifically, the demodulation reference signal may be a DMRS for downlink transmission, used for performing channel estimation on a PUSCH, and the demodulation reference signal may also be a DMRS for uplink transmission, used for performing channel estimation on a PDSCH.

[0419] More specifically, the DMRS may be a DMRS based on a CP-OFDM waveform, the DMRS configuration type is a first configuration type (Type 1 DMRS), and the time domain position of the DMRS is the first one or two symbols in a time slot (ie, Front-loaded DMRS).

[0420] 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 DMRS sequence can be generated using the following formula:

[0421]

[0422] Where r(n) is the DMRS sequence, c(i) is a binary sequence, and is a pseudo-random sequence that needs to be initialized when generated. The generation formula for this pseudo-random sequence is:

[0423]

[0424] Among them, N C=1600, x1(n) can be initialized to x1(0)=1, x1(n)=0, n=1, 2,…, 30, x2(n) satisfies

[0425] Corresponding to the DMRS sequence of PUSCH, the initialization seed c init Defined as:

[0426]

[0427] Where l is the OFDM symbol index, is the number of time slots in a frame, is the number of symbols in a time slot, n SCID ∈{0,1} is the DMRS sequence initialization parameter, For the mask. The value depends on different high-level parameter configurations.

[0428] S302: The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it.

[0429] The time-frequency resources to which the demodulation reference signal sequence 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. The first PRB may be any PRB in the frequency domain resources corresponding to the first CDM group.

[0430] The time-frequency resources to which the demodulation reference signal sequence is mapped may further include time-frequency resources corresponding to a 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, and 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; wherein the first PRB may be any PRB in the frequency domain resources corresponding to the second CDM group.

[0431] 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.

[0432] The first group of subcarriers and the second group of subcarriers each include two subcarriers. Accordingly, 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 spaced and distributed, and the spacing distance is one subcarrier.

[0433] In some embodiments, the first PRB in the frequency domain resources corresponding to the first CDM group and / or the second CDM group 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.

[0434] Taking an example where a PRB in the frequency domain resources corresponding to a 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 to twelfth subcarriers in the PRB may be arranged in order of increasing subcarrier index or frequency, or in order of decreasing subcarrier index or frequency.

[0435] Of course, the above is only an example. In another example, 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.

[0436] 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, each CDM group may include a maximum of 4 demodulation reference signal ports, so that two CDM groups can support a maximum of 8 demodulation reference signal ports; if the demodulation reference signal is transmitted using two symbols, each CDM group may include a maximum of 8 demodulation reference signal ports, so that two CDM groups can support a maximum of 16 demodulation reference signal ports.

[0437] According to the above embodiment, taking the DMRS of the first configuration type (Type 1 DMRS) as an example, and the time domain position of the DMRS is the first one or two symbols in 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 follows: Figure 4 shown.

[0438] like Figure 4 As shown in the figure, when 1 symbol is configured for DMRS transmission, frequency domain OCC is used in the frequency domain to ensure the orthogonality of the sequences on the 4 DMRS ports in the same CDM group; when 2 symbols are configured for DMRS transmission, frequency domain OCC is used in the frequency domain and time domain OCC is used in the time domain to ensure the orthogonality of the sequences on the 8 DMRS ports in the same CDM group.

[0439] Figure 4 In the case of two symbols, the subcarriers corresponding to CDM group 0 include subcarriers {0, 2, 4, 6, 8, 10}, where subcarriers {0, 2} constitute the first group of subcarriers, subcarriers {4, 6} constitute the second group of subcarriers, and subcarriers {8, 10} constitute the third group of 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 third group of subcarriers corresponds to the first group of OCCs. The first and second groups of OCCs are orthogonal.

[0440] The subcarriers corresponding to CDM group 1 include subcarriers {1, 3, 5, 7, 9, 11}. Subcarriers {1, 3} constitute the first subcarrier group, subcarriers {5, 7} constitute the second subcarrier group, and subcarriers {9, 11} constitute the third subcarrier group. The first and third subcarrier groups correspond to the same set of OCCs and are orthogonal to the set of OCCs corresponding to the second subcarrier group.

[0441] Figure 4 In the IEEE Spectrum Data Center (CDM) data structure, when one symbol is configured, the subcarriers corresponding to CDM group 0 include subcarriers {0, 2, 4, 6, 8, 10}, where subcarriers {0, 2} constitute the first subcarrier group, subcarriers {4, 6} constitute the second subcarrier group, and subcarriers {8, 10} constitute the third subcarrier group. The subcarriers corresponding to CDM group 1 include subcarriers {1, 3, 5, 7, 9, 11}, where subcarriers {1, 3} constitute the first subcarrier group, subcarriers {5, 7} constitute the second subcarrier group, and subcarriers {9, 11} constitute the third subcarrier group. The first and third subcarrier groups correspond to the same set of OCCs and are orthogonal to the set of OCCs corresponding to the second subcarrier group.

[0442] It should be noted that Figure 4In the embodiment, when one symbol is configured for DMRS transmission, only the example of CDM group 0 including DMRS ports {p0, p1, p4, p5} and CDM group 1 including DMRS ports {p2, p3, p6, p7} is used for description. In some other embodiments, the port combinations included in CDM group 0 and CDM group 1 may 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 are not listed one by one here. When two symbols are configured for DMRS transmission, only the example of 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} is used for description. In some other embodiments, the port combinations included in CDM group 0 and CDM group 1 may 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 are not listed one by one here.

[0443] It should also be noted that the symbol position used for transmitting DMRS is configurable. Figure 4 Taking the case where only the symbol with index 2 is configured to transmit DMRS, or the symbols with indexes 2 and 3 are configured to transmit DMRS as an example, in some other embodiments, other symbols may also be configured to transmit DMRS.

[0444] It can be seen from the above embodiments that the embodiments of the present application do not increase the time-frequency resource overhead of the demodulation reference signal. Instead, the subcarriers on a PRB in the frequency domain resources corresponding to a CDM group are divided into a first group of subcarriers and a second group of subcarriers, and 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 and the second group of OCCs are orthogonal, thereby increasing the number of mutually orthogonal demodulation reference signal ports in a CDM group, and thereby increasing the number of orthogonal demodulation reference signal ports that the system can support.

[0445] When the above-mentioned embodiment of the present application is applied to a DMRS configured as Type 1DMRS, 16 DMRS port orthogonality can be supported without increasing the DMRS overhead, thereby realizing 16-layer orthogonal multi-user pairing, which is beneficial to reducing inter-layer interference between DMRSs and obtaining more accurate channel estimation results.

[0446] In an embodiment of the present application, after the transmitting device generates a demodulation reference signal sequence, it can obtain the OCC by querying the configuration information table of the demodulation reference signal, and perform mapping of the demodulation reference signal sequence to the time-frequency resources according to the OCC, that is, mapping the demodulation reference signal sequence to the time-frequency resources of the demodulation reference signal.

[0447] In some embodiments, a configuration information table for a demodulation reference signal includes a 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. Based on the configuration information table, the transmitting device may obtain 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, thereby mapping the demodulation reference signal sequence to the time-frequency resources of the demodulation reference signal based on the obtained OCCs.

[0448] 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 demodulation reference signal port index, the CDM group frequency domain offset, and the corresponding relationship between the OCC, and the OCC includes the frequency domain OCC and the time domain OCC. The second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset, and the corresponding relationship between the OCC, and 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. The transmitting device can 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, thereby mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal according to the obtained OCCs.

[0449] In some embodiments of the present application, the transmitting device may map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

[0450]

[0451] k=4n+2k′+Δ

[0452] k′=0,1

[0453] t=mod(n,2)

[0454]

[0455] n=0,1,…

[0456] j=0,1,…,v-1

[0457] in, Represents the data of the demodulation reference signal sequence mapped 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 demodulation reference signal starting symbol, l' is the demodulation reference signal symbol offset, and v is the number of transmission layers. When t = 0, the frequency domain OCC is the first set of OCCs; when t = 1, the frequency domain OCC is the second set of OCCs. The first set of OCCs corresponds to the first group of subcarriers, and the second set of OCCs corresponds to the second group of subcarriers.

[0458] In the above formula (4), the expression of frequency domain OCC W f (k′+2t), can also be replaced by the following expression: W f (k′, t), the mapping method is the same as the mapping method described above.

[0459] In some embodiments, based on the above formula (4), the process in 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:

[0460] 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;

[0461] Step 2: The transmitting device obtains the data of the demodulation reference signal sequence mapped on RE(k,l) based on the obtained CDM group frequency domain offset, frequency domain OCC and time domain OCC Among them, the data mapped on RE(k,l) The above formula (4) is satisfied, that is, the transmitting device can process the obtained CDM frequency domain offset, frequency domain OCC and time domain OCC using formula (4) to obtain the data of the demodulation reference signal sequence mapped on RE (k, l)

[0462] The following describes the implementation process of the embodiment of the present application by combining formula (4) that needs to be satisfied in the above-mentioned mapping process and the two different ways of setting the demodulation reference signal configuration information table, taking the DMRS with the first configuration type (Type 1 DMRS) as an example.

[0463] In some embodiments of the present application, a configuration information table may be set for the DMRS, including 16 DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. The frequency domain OCCs include a first group of OCCs and a second group of OCCs, where the first group of OCCs corresponds to the first group of subcarriers, and the second group of OCCs corresponds to the second group of subcarriers. This is shown in Table 1.

[0464] Table 1 exemplarily shows a DMRS configuration information table provided in an embodiment of the present application.

[0465] Table 1: Parameters for PUSCH DM-RS configuration type 1

[0466]

[0467] 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, W t (l') is the time domain OCC. The frequency domain OCC includes two groups, wherein the group of OCCs corresponding to t=0 is the first group of OCCs, and the group of OCCs corresponding to t=1 is the second group of OCCs.

[0468] In Table 1, the DMRS ports with port indices of 8 to 15 are newly added ports based on the existing ports in the embodiment of the present application. Although the OCCs corresponding to the DMRS ports with port indices of 0 to 7 have also been expanded, the expanded frequency domain OCCs (the two columns of frequency domain OCCs corresponding to t = 1) are the same as the original frequency domain OCCs (the two columns of frequency domain OCCs corresponding to t = 0), so that the OCCs corresponding to the DMRS ports with port indices of 0 to 7 in Table 1 are the same as the OCCs 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 are compatible with the receiving equipment of the original standard.

[0469] 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, then 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 use the above formula (4) to map the DMRS sequence to the corresponding time-frequency resource based on the queried OCC.

[0470] by Figure 4Taking the time-frequency resources shown in the figure as an example, the sequence of each DMRS port in CDM group 0 can be mapped to Figure 4 On the RE filled with slash.

[0471] Take the sequence mapping DMRS port p8 as an example, and the DMRS initial symbol index is 2, l′=0, 1 (i.e., DMRS is transmitted on symbols with indices equal to 2 and 3):

[0472] When n=0, then:

[0473] t=mod(n,2)=0;

[0474] When k′=0, l′=0, k=4n+2k′+Δ=0, By querying Table 1, we can get 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;

[0475] When k′=0,l′=1,k=4n+2k′+Δ=0, By querying Table 1, we can get 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;

[0476] When k′=1,l′=0,k=4n+2k′+Δ=2, By querying Table 1, we can get 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;

[0477] When k′=1, l′=1, k=4n+2k′+Δ=2, By querying Table 1, we can get 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;

[0478] According to the OCC used by the above DMRS port p8 on the first group of subcarriers (subcarrier indexes 0 and 2) of CDM group 0 and the 4 REs corresponding to symbols 2 and 3, a set of frequency domain OCCs {1, 1, 1, 1} can be obtained.

[0479] When n=1, then:

[0480] t=mod(n,2)=1;

[0481] When k′=0, l′=0, k=4n+2k′+Δ=4, By querying Table 1, we can get 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;

[0482] When k′=0,l′=1,k=4n+2k′+Δ=4, By querying Table 1, we can get 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;

[0483] When k′=1, l′=0, k=4n+2k′+Δ=6, By querying Table 1, we can get 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;

[0484] When k′=1, l′=1, k=4n+2k′+Δ=6, By querying Table 1, we can get 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;

[0485] According to the OCC used by the above DMRS port p8 on the second group of subcarriers of CDM group 0 (subcarrier indices 4 and 6) and the 4 REs corresponding to symbols 2 and 3, a set of frequency domain OCCs {-1, -1, -1, -1} can be obtained.

[0486] Using the same method, we can obtain the first set of OCCs used by the sequences of other DMRS ports in CDM group 0 on the first group of subcarriers (subcarrier indices are 0 and 2) and the 4 REs corresponding to symbols 2 and 3, as well as the second set of OCCs used on the second group of subcarriers (subcarrier indices are 4 and 6) and the 4 REs corresponding to symbols 2 and 3. Here, we only list 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 group of subcarriers and the 4 REs corresponding to symbols 2 and 3. For details, please refer to Figure 5 .

[0487] like Figure 5 As shown, on the first group of subcarriers corresponding to CDM group 0 (subcarrier index is 0, 2), the frequency domain OCC of the first group of REs corresponding to port p8 (2 REs in the frequency domain, 2 symbols in the time domain) is {1, 1, 1, 1}, and on the second group of subcarriers corresponding to CDM group 0 (subcarrier index is 4, 6), the frequency domain OCC of the second group of REs corresponding to port p8 is {-1, -1, -1, -1}, and the two groups of OCCs are orthogonal.

[0488] On the first group of subcarriers corresponding to CDM group 0 (subcarrier index is 0, 2), the frequency domain OCC of the first group of REs corresponding to port p9 is {1,-1,1,-1}, and on the second group of subcarriers corresponding to CDM group 0 (subcarrier index is 4, 6), the frequency domain OCC of the second group of REs corresponding to port p9 is {-1,1,-1,1}, and the two groups of OCCs are orthogonal.

[0489] On the first group of subcarriers corresponding to CDM group 0 (subcarrier index is 0, 2), the frequency domain OCC of the first group of REs corresponding to port p12 is {1, 1, -1, -1}, and on the second group of subcarriers corresponding to CDM group 0 (subcarrier index is 4, 6), the frequency domain OCC of the second group of REs corresponding to port p12 is {-1, -1, 1, 1}, and the two groups of OCCs are orthogonal.

[0490] On the first group of subcarriers corresponding to CDM group 0 (subcarrier index is 0, 2), the frequency domain OCC of the first group of REs corresponding to port p13 is {1, -1, -1, 1}, and on the second group of subcarriers corresponding to CDM group 0 (subcarrier index is 4, 6), the frequency domain OCC of the second group of REs corresponding to port p13 is {-1, 1, 1, -1}, and the two groups of OCCs are orthogonal.

[0491] In the embodiment of the present application, the first group of subcarriers, the second group of subcarriers and the 8 REs corresponding to the two symbols are combined together for orthogonalization, and the frequency domain OCC can be equivalent to an OCC with a length of 8.

[0492] The OCC of the sequence of DMRS ports {p0, p1, p4, p5} in CDM group 0 on the 8 REs corresponding to the above two groups of subcarriers and 2 symbols is consistent with that defined in the current standard. In this way, 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 ports {p8, p9, p12, p13}, DMRS mapping is performed according to the above method provided in the embodiment of the present application to ensure that the signals of the newly added 4 DMRS ports are orthogonal to the signals of the original 4 DMRS ports.

[0493] In other embodiments of the present application, a first configuration information table and a second configuration information table may be set for DMRS. The first configuration information table includes eight 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 eight DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. In the second configuration information table, the frequency domain OCCs in the OCCs include a first group of OCCs and a second group of OCCs. The first configuration information table may be shown in Table 2, and the second configuration information table may be shown in Table 3.

[0494] Table 2 exemplarily shows a first configuration information table of a DMRS provided in an embodiment of the present application.

[0495] Table 2: Parameters for PUSCH DM-RS configuration type 1

[0496]

[0497] The parameter descriptions in Table 2 are basically the same as those in Table 1 and will not be repeated here.

[0498] Table 3 exemplarily shows a second configuration information table of a DMRS provided in an embodiment of the present application.

[0499] Table 3: DMRS configuration information for Type 1 DMRS Table 2 (Parameters for PUSCH DM-RS configuration type 1)

[0500]

[0501] The parameter descriptions in Table 3 are basically the same as those in Table 1 and will not be repeated here.

[0502] 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 resource using the traditional DMRS mapping formula based on the obtained OCC.

[0503] Among them, the traditional DMRS mapping formula is:

[0504]

[0505] k=4n+2k′+Δ

[0506] k′=0,1

[0507]

[0508] n=0,1,…

[0509] j=0,1,…,v-1

[0510] The meanings of the parameters in the above formula are basically the same as those in Formula 4 and will not be repeated here.

[0511] 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, and the DMRS sequence is mapped to the corresponding time-frequency resource using Formula 4 based on the obtained OCC. For specific implementation methods, please refer to the relevant content of the above embodiment.

[0512] In some embodiments of the present application, the transmitting device may further indicate the port index of the demodulation reference signal configured for the receiving device to the receiving device. Taking downlink DMRS transmission as an example, specifically, the transmitting device may send indication information of the DMRS port index to the terminal device via downlink control information (DCI).

[0513] In an embodiment of the present application, the correspondence table between demodulation reference signal port index indication information and demodulation reference signal ports may be expanded, and corresponding reference signal port index indication information may be set for the newly added demodulation reference signal ports in the embodiment of the present application.

[0514] Furthermore, in order to save signaling overhead, in an embodiment of the present application, joint encoding may be performed on multiple demodulation reference signal port indexes, thereby using fewer bits of indication information to indicate the multiple demodulation reference signal port indexes.

[0515] Taking DMRS as an example and adopting the first configuration type (Type 1 DMRS), the correspondence table between the expanded DMRS port index indication information and the DMRS port index in the embodiment of the present application is described below.

[0516] Table 4 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 1, provided in an embodiment of the present application. rand = 1 indicates that the number of transmission layers is 1, and the transmitting device configures 1 DMRS port for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0517] Table 4: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=1)

[0518]

[0519] Table 4 shows the values ​​of the port index indication information corresponding to DMRS port indices 0 to 15. Port indexes 14 to 21 are newly added to the existing indication information in this embodiment of the present application, indicating DMRS port indices 8 to 15, respectively. Port indexes 22 to 31 are reserved. The DMRS port index indication information can be 5 bits long.

[0520] This application does not exclude the use of other methods to indicate DMRS port indexes. For example, in some embodiments, the original correspondence table between the indication information for DMRS port indexes 0 to 7 and the DMRS port index can be retained, and a new correspondence table can be added to provide corresponding DMRS port index indication information for DMRS port indexes 8 to 15. The details can be shown in Table 5. maxLength indicates the maximum number of DMRS leading symbols.

[0521] Table 5: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=1)

[0522]

[0523] Table 5 shows the values ​​of the port index indication information corresponding to DMRS port indices 8 to 15. The DMRS port index indication information can be 3 bits long. Taking downlink 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 carried in the DCI to be sent to the terminal device.

[0524] Table 6 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 2, provided in an embodiment of the present application. rand = 2 indicates that the number of transmission layers is 2, and the transmitting device configures 2 DMRS ports for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0525] Table 6: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=2)

[0526]

[0527] In Table 6, the indication information with values ​​of 10 to 15 is newly added in the embodiment of the present application based on the original indication information, and is used to indicate port combinations with port indexes greater than or equal to 8. The DMRS port index indication information may be 4 bits long.

[0528] The DMRS port combination shown in Table 6 is only an example, and other possible port combinations are not excluded, such as the combination of DMRS port indices 8 and 13, the combination of DMRS port indices 10 and 15, etc.

[0529] This application does not exclude the use of other methods to indicate the DMRS port index. For example, in some embodiments, the original correspondence table between DMRS port index indication information and DMRS port index for DMRS port indexes 0 to 7 can be retained, and a new correspondence table can be added to provide corresponding DMRS port index indication information for DMRS port indexes 8 to 15. The details can be shown in Table 7. maxLength indicates the maximum number of DMRS leading symbols.

[0530] Table 7: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=2)

[0531]

[0532] Table 7 provides the corresponding DMRS port index indication information values ​​for various port combinations of port indices 8 to 15. Taking downlink DMRS transmission as an example, the network device can use 3 bits in the DCI to indicate various combinations of DMRS port indices 0 to 15. In some cases, only some of the DMRS port indices can be indicated in the DCI. For example, when the DMRS port indices currently configured by the network device for the terminal are 0 to 3, a 2-bit indication information can be used to indicate the DMRS port indices configured for the terminal device.

[0533] Table 8 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 3, provided in an embodiment of the present application. rand = 3 indicates that the number of transmission layers is 3, and the transmitting device configures 3 DMRS ports for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0534] Table 8: Correspondence 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] In Table 8, the indication information with values ​​of 3 to 4 is newly added in the embodiment of the present application based on the original indication information, and is used to indicate a port combination with a port index greater than or equal to 8. The DMRS port index indication information may be 4 bits long.

[0537] In some other embodiments, when rank=3, other port combination modes may also be used, such as those shown in Table 9. maxLength indicates the maximum number of leading symbols of DMRS. maxLength indicates the maximum leading symbol of DMRS.

[0538] Table 9: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=3)

[0539]

[0540] This application does not exclude the use of other methods to indicate the DMRS port index. For example, in some embodiments, the original correspondence table between DMRS port index indication information and DMRS port index for DMRS port indexes 0 to 7 can be retained, and a new correspondence table can be added to provide corresponding DMRS port index indication information for DMRS port indexes 8 to 15. The details can be shown in Table 10. maxLength indicates the maximum number of DMRS leading symbols.

[0541] Table 10: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=3)

[0542]

[0543] Table 11 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 4, provided in an embodiment of the present application. rand = 4 indicates that the number of transmission layers is 4, and the transmitting device configures 4 DMRS ports for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0544] Table 11: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=4)

[0545]

[0546] 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 may also be used.

[0547] In some embodiments, the original correspondence table between DMRS port index indication information and DMRS port index for DMRS port indexes 0 to 7 may be retained, and a new correspondence table may be added to provide corresponding DMRS port index indication information for DMRS port indexes 8 to 15. The details may be shown in Table 12. maxLength indicates the maximum number of leading symbols for DMRS.

[0548] Table 12: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=4)

[0549]

[0550] See Figure 6 As shown in FIG, a flow chart 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 in the figure can also be applied to other network architectures, and this application does not limit this. Figure 1 In 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 the method may be a terminal device Figure 1 For uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 The terminal device (102a-102d) in the method may be a receiving device Figure 1 The network device 101 in FIG.

[0551] See Figure 6 As shown, the method may include the following processing flow:

[0552] S601: A receiving device receives a demodulation reference signal sent by a transmitting device on a time-frequency resource of the demodulation reference signal.

[0553] The demodulation reference signal and the related instructions of the sending device sending the demodulation reference signal can be found in Figure 3 Related content in .

[0554] S602: The receiving device obtains the sequence of the demodulation reference signal.

[0555] In some embodiments, the receiving device is configured with a demodulation reference signal configuration information table. For details about the configuration information table, see Figure 3 The receiving device may process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain a sequence of the demodulation reference signal. Specifically, the process may include the following steps:

[0556] 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, wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0557] 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) The above formula (4) is satisfied.

[0558] In some embodiments, a receiving device receives indication information of a demodulation reference signal port index in a first CDM group sent by a sending device, thereby obtaining a demodulation reference signal port index allocated by the sending device based on the indication information of the demodulation reference signal port index, and queries the configuration information table of the above-mentioned demodulation reference signal based on the demodulation reference signal port index and the CDM group to which it belongs, obtains an OCC code, and then calculates a sequence of the demodulation reference signal based on a mapping formula of the demodulation reference signal.

[0559] According to the above-described embodiments of the present application, the number of orthogonal DMRS ports can be increased without additional DMRS overhead. Furthermore, the present application is compatible with existing receiving devices, allowing multi-user pairing between the new receiving device provided by the present application and a receiving device that only supports existing standard capabilities, without requiring hardware or software updates to the existing receiving devices. The expansion of DMRS orthogonal ports enables multi-user orthogonal pairing for more layers in the uplink or downlink, which helps improve system capacity.

[0560] The present application also provides a signal transmission method and apparatus for increasing the number of orthogonal demodulation reference signal ports supported by a system without increasing demodulation reference signal overhead. The method and apparatus are based on the same inventive concept. Since the method and apparatus solve similar problems, the implementation of the apparatus and method can refer to each other, and any repetitions will not be repeated.

[0561] See Figure 7 FIG. 1 is a flow chart of a signal transmission method implemented on a transmitting device side according to an embodiment of the present application. The method can be applied to Figure 1 The network architecture shown in the figure can also be applied to other network architectures, and this application does not limit this. Figure 1 In 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 the method may be a receiving device Figure 1For uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 The terminal device (102a-102d) in the method may be a receiving device Figure 1 The network device 101 in FIG.

[0562] See Figure 7 As shown, the method may include the following processing flow:

[0563] S701: The transmitting device generates a sequence of a demodulation reference signal.

[0564] The demodulation reference signal is used to estimate the channel state of the first channel. The demodulation reference signal is used to estimate the channel state of the first channel, which can be understood as the demodulation reference signal being 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.

[0565] Specifically, the demodulation reference signal may be a DMRS for downlink transmission, used for performing channel estimation on a PUSCH, and the demodulation reference signal may also be a DMRS for uplink transmission, used for performing channel estimation on a PDSCH.

[0566] More specifically, the DMRS may be a DMRS based on a CP-OFDM waveform, the DMRS configuration type is a first configuration type (Type 1 DMRS), and the time domain position of the DMRS is the first one or two symbols in a time slot (ie, Front-loaded DMRS).

[0567] The specific implementation method of the sending device generating the demodulation reference signal sequence is the same as the above Figure 3 The relevant contents in S301 are basically the same and will not be repeated here.

[0568] S702: The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it.

[0569] The time-frequency resources to which the sequence of the demodulation reference signal is mapped include frequency domain resources corresponding to the first CDM group.

[0570] The frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals. The arrangement of the frequency domain resources corresponding to a CDM group can be found in Figure 3 Related content in S302.

[0571] 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.

[0572] 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.

[0573] 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 may include two types: a front-loaded demodulation reference signal and an additional demodulation reference signal. The time domain position of the front-loaded demodulation reference signal is the first few symbols in a time slot, such as the first 2 symbols of the first time slot in a subframe; the time domain position of the additional demodulation reference signal is the several symbols after the time domain position of the front-loaded demodulation reference signal, such as the 2 symbols in the second time slot in a subframe. The first group of symbols may include symbols occupied by the front-loaded demodulation reference signal, and the second group of symbols may include symbols occupied by the additional demodulation reference signal. For 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.

[0574] In some embodiments, the first group of symbols and the second group of symbols include the same number of symbols. For example, the first group of symbols and the second group of symbols each include 2 consecutive symbols.

[0575] 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 included in the first symbol group or the second symbol group. For example, if two preamble symbols are configured for the demodulation reference signal, each CDM group can include a maximum of 8 demodulation reference signal ports, so that the two CDM groups can support a maximum of 16 demodulation reference signal ports.

[0576] According to the above embodiment, taking the DMRS of the first configuration type (Type 1 DMRS) as an example, and the DMRS preamble symbol is two symbols in the first time slot, and the extra symbol is 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 follows: Figure 7 shown.

[0577] like Figure 8As shown in FIG, when two preamble symbols and two additional symbols are configured, the first group of symbols corresponding to CDM group 0 includes symbols {2, 3, 8, 9}, where symbols {2, 3} constitute the first group of symbols and symbols {8, 9} constitute the second group of symbols. The first group of symbols corresponds to the first group of OCCs, and 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.

[0578] The first group of symbols corresponding to CDM group 1 includes symbols {2, 3, 8, 9}, where symbols {2, 3} constitute the first group of symbols and symbols {8, 9} constitute the second group of symbols. The first group of symbols corresponds to the first group of OCCs, and the second group of symbols corresponds to the second group of OCCs. The first group of OCCs is orthogonal to the second group of OCCs.

[0579] It should be noted that Figure 8 In the embodiment, when 2 preamble symbols and 2 additional symbols are configured for DMRS transmission, only CDM group 0 includes DMRS ports {p0, p1, p4, p5, p8, p9, p12, p13}, and CDM group 1 includes DMRS ports {p2, p3, p6, p7, p10, p11, p14, p15} as an example. In some other embodiments, the port combinations included in CDM group 0 and CDM group 1 may 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 are not listed one by one here.

[0580] It should also be noted that the symbol position for transmitting DMRS is configurable and is not limited to Figure 7 Symbol positions are shown. For example, the preamble symbol can be allocated to the first and second OFDM symbols.

[0581] It can be seen from the above embodiments that the embodiments of the present application do not increase the time-frequency resource overhead of the demodulation reference signal. Instead, the symbols in the time domain resources corresponding to a CDM group are divided into a first group of symbols and a second group of symbols, and the first group of symbols corresponds to the first group of OCCs, and the second group of symbols corresponds to the second group of OCCs. The first group of OCCs and the second group of OCCs are orthogonal, thereby increasing the number of mutually orthogonal demodulation reference signal ports in a CDM group, and thereby increasing the number of orthogonal demodulation reference signal ports that the system can support.

[0582] When the above embodiments of the present application are applied to a DMRS configured as Type 1 DMRS, 16 DMRS ports can be orthogonalized without increasing DMRS overhead, enabling 16-layer orthogonal multi-user pairing. This helps reduce inter-layer interference between DMRSs and achieves more accurate channel estimation results. The above embodiments are applicable to scenarios where the channel time variation is relatively slow.

[0583] In an embodiment of the present application, after the transmitting device generates a demodulation reference signal sequence, it can obtain the OCC by querying the configuration information table of the demodulation reference signal, and perform mapping of the demodulation reference signal sequence to the time-frequency resources according to the OCC, that is, mapping the demodulation reference signal sequence to the time-frequency resources of the demodulation reference signal.

[0584] In some 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 the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset, and the correspondence between the OCCs, wherein the OCCs include frequency domain OCCs and time domain OCCs, and the time domain OCCs include a first group of OCCs and a second group of OCCs. The DMRS types corresponding to the first and second groups 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. 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 the configuration information table and the demodulation reference signal type, thereby mapping the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal according to the obtained OCCs.

[0585] In some other embodiments, the above-mentioned first group of OCCs and 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. 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 pre-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 the frequency domain OCC and the time domain OCC. 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 the frequency domain OCC and the time domain OCC. The time domain OCC is the second group of OCCs.

[0586] 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 may map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

[0587]

[0588] k=4n+2k′+Δ

[0589] k′=0,1

[0590] s=0,1

[0591]

[0592] n=0,1,…

[0593] j=0,1,…,v-1

[0594] in, Represents the data of the demodulation reference signal sequence mapped 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 indicates the pre-DMRS and the time domain OCC is the first group of OCCs; when s = 1, it indicates the additional DMRS and the time domain OCC is the second group of OCCs.

[0595] 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 demodulation reference signal type, demodulation reference signal port index, CDM group frequency domain offset, and the corresponding relationship between the OCCs, wherein the OCCs include frequency domain OCCs and time domain OCCs, and the frequency domain OCCs include a first group of OCCs and a second group of OCCs. The first group of OCCs and the second group of OCCs correspond to different demodulation reference signal types. Specifically, 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 a first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. 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 based on the configuration information table and the demodulation reference signal type, and thereby map the demodulation reference signal sequence to the time-frequency resources of the demodulation reference signal according to the obtained OCCs.

[0596] In some other embodiments, the above-mentioned first group of OCCs and 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 the frequency domain OCC and the time domain OCC. 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 the frequency domain OCC and the time domain OCC. The frequency domain OCC is the second group of OCCs.

[0597] 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 may map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

[0598]

[0599] k=4n+2k′+Δ

[0600] k′=0,1

[0601] s=0,1

[0602]

[0603] n=0,1,…

[0604] j=0,1,…,v-1

[0605] in, Represents the data of the demodulation reference signal sequence mapped 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 indicates the pre-DMRS and the frequency domain OCC is the first group of OCCs; when s=1, it indicates the additional DMRS and the frequency domain OCC is the second group of OCCs.

[0606] In some embodiments, based on the above formula (6) or formula (7), the process in which the transmitting device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal may include the following steps:

[0607] 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;

[0608] Step 2: The transmitting device obtains the data of the demodulation reference signal sequence mapped on RE(k,l) based on the obtained CDM group frequency domain offset, frequency domain OCC and time domain OCC Among them, the data mapped on RE(k,l) The above formula (6) or formula (7) is satisfied, that is, the transmitting device can use formula (6) or formula (7) to process based on the obtained CDM group frequency domain offset, frequency domain OCC and time domain OCC, so as to obtain the data of the demodulation reference signal sequence mapped on RE (k, l)

[0609] The following describes the implementation process of the embodiment of the present application by combining formula (6) that needs to be satisfied in the above-mentioned mapping process and the two different ways of setting the demodulation reference signal configuration information table, taking the DMRS with the first configuration type (Type 1 DMRS) as an example.

[0610] In some embodiments of the present application, a configuration information table may be set for DMRS, including 16 DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. 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 group of symbols and is used for the pre-DMRS, and the second group of OCCs corresponds to a second group of symbols and is used for the additional DMRS. Specifically, as shown in Table 13.

[0611] Table 13 exemplarily shows a DMRS configuration information table provided in an embodiment of the present application.

[0612] Table 13: Parameters for PUSCH DM-RS configuration type 1 for DMRS

[0613]

[0614] 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), and W f (k′) is the frequency domain OCC, W t (l′, s) is the time domain OCC. The time domain OCC includes two groups, wherein the group of OCCs corresponding to s=0 is the first group of OCCs, and the group of OCCs corresponding to s=1 is the second group of OCCs.

[0615] In Table 13, the DMRS ports with port indexes 8 to 15 are newly added ports based on the existing ports in the embodiment of the present application. Although the OCCs corresponding to the DMRS ports with port indexes 0 to 7 have also been expanded, the expanded time domain OCCs (the two columns of time domain OCCs corresponding to s = 1) are the same as the original time domain OCCs (the two columns of time domain OCCs corresponding to s = 0). Therefore, the OCCs corresponding to the DMRS ports with port indexes 0 to 7 in Table 13 are the same as the OCCs corresponding to the DMRS ports in the original DMRS configuration information table.

[0616] 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, then after generating the DMRS sequence, the transmitting device can query the above Table 13 according to the DMRS port index to obtain the corresponding OCC, and use the above formula (6) to map the DMRS sequence to the corresponding time-frequency resource based on the queried OCC.

[0617] by Figure 7Taking the time-frequency resources shown in the figure as an example, the sequence of each DMRS port in CDM group 0 can be mapped to Figure 7 On the RE filled with slash.

[0618] Take the sequence mapping DMRS port p8 as an example, and the DMRS initial symbol index is 2, l′=0,1, the preamble DMRS is transmitted on symbols 2 and 3, and the extra DMRS is transmitted on symbols 8 and 9.

[0619] When s=0, the mapping of the pre-DMRS of DMRS port p8 is:

[0620] When k′=0, l′=0, k=4n+2k′+Δ=0, By querying Table 13, we can get 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;

[0621] When k′=0,l′=1,k=4n+2k′+Δ=0, By querying Table 13, we can get 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;

[0622] When k′=1,l′=0,k=4n+2k′+Δ=2, By querying Table 13, we can get 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.

[0623] When k′=1, l′=1, k=4n+2k′+Δ=2, By querying Table 13, we can get 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;

[0624] According to the OCC used by the above DMRS port p8 on the first group of symbols (symbols 2 and 3) of CDM group 0 and the 4 REs corresponding to subcarriers 0 and 2, a set of time domain OCCs {1, 1, 1, 1} can be obtained.

[0625] When s=1, the mapping of the additional DMRS of DMRS port p8 is:

[0626] When k′=0, l′=0, k=4n+2k′+Δ=0, By querying Table 13, we can get 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;

[0627] When k′=0,l′=1,k=4n+2k′+Δ=0, By querying Table 13, we can get 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;

[0628] When k′=1,l′=0,k=4n+2k′+Δ=2, By querying Table 13, we can get 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.

[0629] When k′=1, l′=1, k=4n+2k′+Δ=2, By querying Table 13, we can get 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;

[0630] According to the OCC used by the above DMRS port p8 on the second group of symbols (symbols 8 and 9) of CDM group 0 and the 4 REs corresponding to subcarriers 0 and 2, a set of time domain OCCs {-1, -1, -1, -1} can be obtained.

[0631] Using the same method, we can obtain the first group of OCCs used by the sequences of other DMRS ports in CDM group 0 on the first group of symbols (symbols 2, 3) and the four REs corresponding to subcarriers 0 and subcarrier 2, as well as the second group of OCCs used on the second group of symbols (symbols 8, 9) and the four REs corresponding to subcarriers 0 and subcarrier 2. Here, we only list the first and second groups of OCCs used by DMRS ports p8, p9, p12, and p13 in CDM group 0 on the above eight REs. For details, see Figure 9 .

[0632] like Figure 9 As 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, 2 symbols in the time domain) corresponding to port p8 is {1, 1, 1, 1}, and 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}, and the two groups of OCCs are orthogonal.

[0633] On the first group of symbols corresponding to CDM group 0 (symbols 2, 3), the time domain OCC of the first group of REs corresponding to port p9 is {1, -1, 1, -1}, and on the second group of symbols corresponding to CDM group 0 (symbols 8, 9), the time domain OCC of the second group of REs corresponding to port p9 is {-1, 1, -1, 1}. The two groups of OCCs are orthogonal.

[0634] On the first group of symbols corresponding to CDM group 0 (symbols 2, 3), the time domain OCC of the first group of REs corresponding to port p12 is {1, 1, -1, -1}, and on the second group of symbols corresponding to CDM group 0 (symbols 8, 9), the time domain OCC of the second group of REs corresponding to port p12 is {-1, -1, 1, 1}. The two groups of OCCs are orthogonal.

[0635] On the first group of symbols corresponding to CDM group 0 (symbols 2, 3), the time domain OCC of the first group of REs corresponding to port p13 is {1, -1, -1, 1}, and on the second group of symbols corresponding to CDM group 0 (symbols 8, 9), the time domain OCC of the second group of REs corresponding to port p13 is {-1, 1, 1, -1}. The two groups of OCCs are orthogonal.

[0636] In the embodiment of the present application, the first group of symbols, the second group of symbols and the 8 REs corresponding to the two subcarriers are combined together for orthogonalization, and the time domain OCC can be equivalent to an OCC with a length of 8.

[0637] The OCC of the sequence of DMRS ports {p0, p1, p4, p5} in CDM group 0 on the 8 REs corresponding to the above two groups of symbols and 2 subcarriers is consistent with that defined in the current standard. In this way, 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 ports {p8, p9, p12, p13}, DMRS mapping is performed according to the above method provided in the embodiment of the present application to ensure that the signals of the newly added 4 DMRS ports are orthogonal to the signals of the original 4 DMRS ports.

[0638] In 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 pre-DMRS, and the DMRS type corresponding to the second configuration information table is additional DMRS. The first configuration information table is used for DMRS sequence mapping for pre-DMRS, and the second configuration information table is used for DMRS sequence mapping for additional DMRS. 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 a first group of OCCs. 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 a second group of OCCs. The first configuration information table may be as shown in Table 14, and the second configuration information table may be as shown in Table 15.

[0639] Table 14 exemplarily shows a first configuration information table of a DMRS provided in an embodiment of the present application.

[0640] Table 14: Parameters for PUSCH DM-RS configuration type 1 for front-loaded DMRS

[0641]

[0642] The parameter descriptions in Table 14 are basically the same as those in Table 13 and are not repeated here.

[0643] Table 15 exemplarily shows a second configuration information table of an additional DMRS provided in an embodiment of the present application.

[0644] Table 15: Parameters for PUSCH DM-RS configuration type 1 for additional DMRS

[0645]

[0646] The parameter descriptions in Table 15 are basically the same as those in Table 13 and are not repeated here.

[0647] If the transmitting device configures a pre-DMRS and an additional DMRS for the receiving device, when mapping the DMRS sequence to the first group of symbols corresponding to the pre-DMRS, the corresponding OCC is obtained according to Table 14, and the DMRS sequence is mapped to the corresponding time-frequency resource using a conventional DMRS mapping formula (e.g., Formula 5) based on the obtained OCC. When mapping the DMRS sequence to the second group of symbols corresponding to the additional DMRS, the corresponding OCC is obtained according to Table 15, and the DMRS sequence is mapped to the corresponding time-frequency resource using a conventional DMRS mapping formula based on the obtained OCC. For specific implementation methods, please refer to the relevant content of the aforementioned embodiments.

[0648] In some embodiments of the present application, a configuration information table may be set for DMRS, including 16 DMRS port indexes, and the CDM group frequency domain offset and OCC corresponding to each DMRS port index. The frequency domain OCCs include a first group of OCCs and a second group of OCCs. The first group of OCCs corresponds to a first group of symbols and is used for the pre-DMRS, and the second group of OCCs corresponds to a second group of symbols and is used for the additional DMRS. Specifically, as shown in Table 16.

[0649] Table 16 exemplarily shows a DMRS configuration information table provided in an embodiment of the present application.

[0650] Table 16: Parameters for PUSCH DM-RS configuration type 1 for DMRS

[0651]

[0652] 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), and W f (k′,s) is the frequency domain OCC, W t (l') is the time domain OCC. The frequency domain OCC includes two groups, wherein the group of OCCs corresponding to s=0 is the first group of OCCs, and the group of OCCs corresponding to s=1 is the second group of OCCs.

[0653] In Table 16, the DMRS ports with port indexes 8 to 15 are newly added ports based on the existing ports in the embodiment of the present application. Although the OCCs corresponding to the DMRS ports with port indexes 0 to 7 are also expanded, the expanded frequency domain OCCs (the two columns of frequency domain OCCs corresponding to s = 1) are the same as the original frequency domain OCCs (the two columns of frequency domain OCCs corresponding to s = 0). Therefore, the OCCs corresponding to the DMRS ports with port indexes 0 to 7 in Table 16 are the same as the OCCs corresponding to the DMRS ports in the original DMRS configuration information table.

[0654] 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, then after generating the DMRS sequence, the transmitting device can query the above Table 16 according to the DMRS port index to obtain the corresponding OCC, and use the above formula (7) to map the DMRS sequence to the corresponding time-frequency resource based on the queried OCC.

[0655] 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, then after generating the DMRS sequence, the transmitting device can query the above Table 16 according to the DMRS port index to obtain the corresponding OCC, and use the above formula (7) to map the DMRS sequence to the corresponding time-frequency resource based on the queried OCC.

[0656] by Figure 7 Taking the time-frequency resources shown in the figure as an example, the sequence of each DMRS port in CDM group 0 can be mapped to Figure 7 The sequences of the DMRS ports in CDM group 0 use the first set of OCCs on the first set of symbols (symbols 2, 3) and the four REs corresponding to subcarriers 0 and 2, and the second set of OCCs on the second set of symbols (symbols 8, 9) and the four REs corresponding to subcarriers 0 and 2. Only the first and second sets of OCCs used by DMRS ports p8, p9, p12, and p13 in CDM group 0 on the above eight REs are listed here. For details, see Figure 8 .

[0657] In the embodiment of the present application, the first group of symbols, the second group of symbols and the 8 REs corresponding to the two subcarriers are combined together for orthogonalization, and the time domain OCC can be equivalent to an OCC with a length of 8.

[0658] The OCC of the sequence of DMRS ports {p0, p1, p4, p5} in CDM group 0 on the 8 REs corresponding to the above two groups of symbols and 2 subcarriers is consistent with that defined in the current standard. In this way, 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 ports {p8, p9, p12, p13}, DMRS mapping is performed according to the above method provided in the embodiment of the present application to ensure that the signals of the newly added 4 DMRS ports are orthogonal to the signals of the original 4 DMRS ports.

[0659] In 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 pre-DMRS, and the DMRS type corresponding to the second configuration information table is additional DMRS. The first configuration information table is used for DMRS sequence mapping for pre-DMRS, and the second configuration information table is used for DMRS sequence mapping for additional DMRS. 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 a first group of OCCs. 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 a second group of OCCs. The first configuration information table may be as shown in Table 17, and the second configuration information table may be as shown in Table 18.

[0660] Table 17 exemplarily shows a first configuration information table of a DMRS provided in an embodiment of the present application.

[0661] Table 17: Parameters for PUSCH DM-RS configuration type 1 for front-loaded DMRS

[0662]

[0663] The parameter descriptions in Table 17 are basically the same as those in Table 16 and are not repeated here.

[0664] Table 18 exemplarily shows a second configuration information table of an additional DMRS provided in an embodiment of the present application.

[0665] Table 18: Parameters for PUSCH DM-RS configuration type 1 for additional DMRS

[0666]

[0667] The parameter descriptions in Table 18 are basically the same as those in Table 16 and are not repeated here.

[0668] If the transmitting device configures a pre-DMRS and an additional DMRS for the receiving device, when mapping the DMRS sequence to the first group of symbols corresponding to the pre-DMRS, the corresponding OCC is obtained according to Table 17, and the DMRS sequence is mapped to the corresponding time-frequency resource using a conventional DMRS mapping formula (e.g., Formula 5) based on the obtained OCC. When mapping the DMRS sequence to the second group of symbols corresponding to the additional DMRS, the corresponding OCC is obtained according to Table 18, and the DMRS sequence is mapped to the corresponding time-frequency resource using a conventional DMRS mapping formula based on the obtained OCC. For specific implementation methods, please refer to the relevant content of the aforementioned embodiments.

[0669] In some embodiments of the present application, the transmitting device may also indicate to the receiving device the port index of the demodulation reference signal configured for the receiving device. Specifically, taking downlink DMRS transmission as an example, the network device may send indication information of the demodulation reference signal port index to the terminal device via DCI. For specific implementation methods, please refer to the aforementioned embodiments.

[0670] See Figure 10 As shown in FIG, a flow chart 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 in the figure can also be applied to other network architectures, and this application does not limit this. Figure 1 In 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 the method may be a receiving device Figure 1 For uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 The terminal device (102a-102d) in the method may be a receiving device Figure 1 The network device 101 in FIG.

[0671] See Figure 10 As shown, the method may include the following processing flow:

[0672] S1001: A receiving device receives a demodulation reference signal sent by a transmitting device on a time-frequency resource of the demodulation reference signal.

[0673] The demodulation reference signal and the related instructions of the sending device sending the demodulation reference signal can be found in Figure 7 Related content in .

[0674] S1002: The receiving device obtains the sequence of the demodulation reference signal.

[0675] In some embodiments, the receiving device is configured with a demodulation reference signal configuration information table. For details about the configuration information table, see Figure 7 The receiving device may process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain a sequence of the demodulation reference signal. Specifically, the process may include the following steps:

[0676] 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, wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0677] 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) The above formula (6) or formula (7) is satisfied.

[0678] In some embodiments, a receiving device receives indication information of a demodulation reference signal port index in a first CDM group sent by a sending device, thereby obtaining a demodulation reference signal port index allocated by the sending device based on the indication information of the demodulation reference signal port index, and queries the configuration information table of the above-mentioned demodulation reference signal based on the demodulation reference signal port index and the CDM group to which it belongs, obtains an OCC code, and then calculates a sequence of the demodulation reference signal based on a mapping formula of the demodulation reference signal.

[0679] According to the above-described embodiments of the present application, the number of orthogonal DMRS ports can be increased without additional DMRS overhead. Furthermore, the present application is compatible with existing receiving devices, allowing multi-user pairing between the new receiving device provided by the present application and a receiving device that only supports existing standard capabilities, without requiring hardware or software updates to the existing receiving devices. The expansion of DMRS orthogonal ports enables multi-user orthogonal pairing for more layers in the uplink or downlink, which helps improve system capacity.

[0680] The present application also provides a signal transmission method and apparatus for increasing the number of orthogonal demodulation reference signal ports supported by a system without increasing demodulation reference signal overhead. The method and apparatus are based on the same inventive concept. Since the method and apparatus solve similar problems, the implementation of the apparatus and method can refer to each other, and any repetitions will not be repeated.

[0681] See Figure 11 , is a flow chart of a signal transmission method implemented on the transmitting device side provided in an embodiment of the present application. This method can be applied to Figure 1 The network architecture shown in the figure can also be applied to other network architectures, and this application does not limit this. Figure 1 In 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 the method may be a receiving device Figure 1 For uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 The terminal device (102a-102d) in the method may be a receiving device Figure 1 The network device 101 in FIG.

[0682] See Figure 11 As shown, the method may include the following processing flow:

[0683] S1101: The transmitting device generates a sequence of a demodulation reference signal.

[0684] The demodulation reference signal is used to estimate the channel state of the first channel. The demodulation reference signal is used to estimate the channel state of the first channel, which can be understood as the demodulation reference signal being 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.

[0685] Specifically, the demodulation reference signal may be a DMRS for downlink transmission, used for performing channel estimation on a PUSCH, and the demodulation reference signal may also be a DMRS for uplink transmission, used for performing channel estimation on a PDSCH.

[0686] More specifically, the DMRS can be based on a DFT-S-OFDM waveform or a CP-OFDM waveform. If a DFT-S-OFDM waveform is used, the DMRS is generated based on a ZC (Zadoff-Chu) sequence; if a CP-OFDM waveform is used, the DMRS is generated based on a gold sequence. The method for generating a DMRS sequence based on a gold sequence can be found in the aforementioned embodiments. This embodiment of the present application does not limit the method for generating a DMRS sequence based on a gold sequence.

[0687] Taking the DMRS based on the DFT-S-OFDM waveform as an example, the DMRS sequence can be generated based on the cyclic shift of the ZC sequence. Specifically, the DMRS sequence can be generated using the following formula:

[0688]

[0689] Where 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 number of base sequences in a sequence group, m is the number of RBs allocated by the transmitting device to the receiving device, is the number of subcarriers included in one RB. For PUSCH transmission, δ=1 and α=0. In addition, Defined as:

[0690]

[0691]

[0692]

[0693] in,

[0694] N ZC The value is less than M ZC The maximum prime number of . For the sequence group index u, its value is:

[0695]

[0696] Among them, f g h indicates whether sequence hopping is performed, The value of is subject to the following two conditions:

[0697] Case 1: When the upper 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 for TC-RNTI, then Configured by the nPUSCH-Identity parameter of the higher layer.

[0698] Case 2: That is, it is equal to the cell ID.

[0699] Since different cells and different receiving devices can be configured differently The sequences generated by different cells have a certain degree of randomness.

[0700] S1102: The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it.

[0701] The time-frequency resources to which the demodulation reference signal sequence is mapped may include the time-frequency resources corresponding to two CDM groups. The time-frequency resources corresponding to the first CDM group 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, and 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.

[0702] In some embodiments, the frequency domain resources corresponding to a CDM group may be divided into subcarrier groups, and each subcarrier group may include 2 subcarriers. For example, the frequency domain resources corresponding to a CDM group include, in descending order of subcarrier index or descending order, the first subcarrier, the second subcarrier, the third subcarrier, the fourth subcarrier, ..., and so on. 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, a PRB (such as the first PRB) in the frequency domain resources corresponding to the first port and the frequency domain resources corresponding to 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.

[0703] 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 first one or two symbols in a time slot (ie, Front-loaded DMRS), then in some embodiments of the present application, in a PRB, the time-frequency resource position of the DMRS and the subcarrier group division may be as follows: Figure 4 shown.

[0704] like Figure 4As shown in the figure, when 1 symbol or 2 symbols are configured, the frequency domain resources corresponding to CDM group 0 include subcarriers {0, 2, 4, 6, 8, 10}, where subcarriers {0, 2} constitute the first subcarrier group, subcarriers {4, 6} constitute the second subcarrier group, and subcarriers {8, 10} constitute 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} constitute the first subcarrier group, subcarriers {5, 7} constitute the second subcarrier group, and subcarriers {9, 11} constitute the third subcarrier group. When one symbol is configured, CDM group 0 includes ports {p0, p1, p4, p5}, and CDM group 1 includes ports {p2, p3, p6, p7}. When two symbols are configured, 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}.

[0705] The OCC codes used by the frequency domain resources corresponding to a port on the REs corresponding to multiple subcarriers can form an OCC code sequence. In this embodiment of the present application, the sequence formed by the OCC codes used by the frequency domain resources corresponding to the second port on the REs corresponding to all subcarriers in the above-mentioned at least two subcarrier groups is obtained by cyclically shifting the sequence formed by the OCC codes used by the frequency domain resources corresponding to the first port on the REs corresponding to all subcarriers in the above-mentioned at least two subcarrier groups, and the sequences formed by the OCC codes used by the frequency domain resources corresponding to the same port (such as the first port or the second port) on the REs corresponding to the above-mentioned different subcarrier groups are different from each other.

[0706] Specifically, in some embodiments, the OCC codes used on the REs corresponding to all subcarriers in the first subcarrier group and the second subcarrier group for the frequency domain resources corresponding to the first port form a first OCC code sequence, and the OCC codes used on the REs corresponding to all subcarriers in the first subcarrier group and the second subcarrier group 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. The second OCC code sequence is obtained by cyclically shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

[0707] For example, Figure 4 Taking the subcarrier group division shown in FIG. 1 as an example, the OCC codes used on the corresponding REs for the frequency domain resources corresponding to the first port (p0) and the second port (p8) in CDM group 0 are as follows:

[0708] The frequency domain resource corresponding to the first port (p0) uses OCC1 on the RE corresponding to the first subcarrier 0 in the first subcarrier group;

[0709] The frequency domain resource corresponding to the first port (p0) uses OCC2 on the RE corresponding to the second subcarrier 2 in the first subcarrier group;

[0710] The frequency domain resource corresponding to the first port (p0) uses OCC3 on the RE corresponding to the first subcarrier 4 in the second subcarrier group;

[0711] The frequency domain resource corresponding to the first port (p0) uses OCC4 on the RE corresponding to the second subcarrier 6 in the second subcarrier group;

[0712] The frequency domain resource corresponding to the second port (p8) uses OCC5 on the RE corresponding to the first subcarrier 0 in the first subcarrier group;

[0713] The frequency domain resource corresponding to the second port (p8) uses OCC6 on the RE corresponding to the second subcarrier 2 in the first subcarrier group;

[0714] The frequency domain resource corresponding to the second port (p8) uses OCC7 on the RE corresponding to the first subcarrier 4 in the second subcarrier group;

[0715] The frequency domain resources corresponding to the second port (p8) use OCC8 on the RE corresponding to the second subcarrier 6 in the second subcarrier group.

[0716] OCC1 to OCC4 form a first OCC sequence of length 4, and OCC5 to OCC8 form a second OCC sequence of length 4. The second OCC sequence is obtained by cyclic shifting the first OCC sequence. OCC1 and OCC2 form a third OCC sequence, and OCC3 and OCC4 form a fourth OCC sequence. The third and fourth OCC sequences are different. The sequence formed by OCC5 and OCC6 can also be referred to as the third OCC sequence, and the sequence formed by OCC7 and OCC8 can be referred to as the fourth OCC sequence. In this case, the third and fourth OCC sequences are different.

[0717] In some other embodiments, the OCC codes used on the REs corresponding to all subcarriers in the first, second, and third 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 first, second, and third 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; the OCC codes used on the REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence; and the OCC codes used on the REs corresponding to two carriers in the third subcarrier group form a fifth OCC code sequence. The second OCC code sequence is obtained by cyclically shifting the first OCC code sequence, and any two of the third, fourth, and fifth OCC code sequences are different.

[0718] For example, Figure 4 Taking the subcarrier group division shown in FIG. 1 as an example, the OCC codes used on the corresponding REs for the frequency domain resources corresponding to the first port (p0) and the second port (p8) in CDM group 0 are as follows:

[0719] The frequency domain resource corresponding to the first port (p0) uses OCC1 on the RE corresponding to the first subcarrier 0 in the first subcarrier group;

[0720] The frequency domain resource corresponding to the first port (p0) uses OCC2 on the RE corresponding to the second subcarrier 2 in the first subcarrier group;

[0721] The frequency domain resource corresponding to the first port (p0) uses OCC3 on the RE corresponding to the first subcarrier 4 in the second subcarrier group;

[0722] The frequency domain resource corresponding to the first port (p0) uses OCC4 on the RE corresponding to the second subcarrier 6 in the second subcarrier group;

[0723] The frequency domain resources corresponding to the first port (p0) use OCC5 on the RE corresponding to the first subcarrier 8 in the third subcarrier group;

[0724] The frequency domain resource corresponding to the first port (p0) uses OCC6 on the RE corresponding to the second subcarrier 10 in the third subcarrier group;

[0725] The frequency domain resource corresponding to the second port (p8) uses OCC7 on the RE corresponding to the first subcarrier 0 in the first subcarrier group;

[0726] The frequency domain resource corresponding to the second port (p8) uses OCC8 on the RE corresponding to the second subcarrier 2 in the first subcarrier group;

[0727] The frequency domain resource corresponding to the second port (p8) uses OCC9 on the RE corresponding to the first subcarrier 4 in the second subcarrier group;

[0728] The frequency domain resource corresponding to the second port (p8) uses OCC10 on the RE corresponding to the second subcarrier 6 in the second subcarrier group;

[0729] The frequency domain resource corresponding to the second port (p8) uses OCC11 on the RE corresponding to the first subcarrier 8 in the third subcarrier group;

[0730] The frequency domain resources corresponding to the second port (p8) use OCC12 on the RE corresponding to the second subcarrier 10 in the third subcarrier group.

[0731] Among them, OCC7 to OCC12 form a second OCC sequence of length 6, and OCC1 to OCC6 form a first OCC sequence of length 4. The second OCC sequence is obtained by cyclic shifting the first OCC sequence. OCC1 and OCC2 form a third OCC sequence, OCC3 and OCC4 form a fourth OCC sequence, and OCC5 and OCC6 form a fifth OCC sequence. The third OCC sequence is different from the fourth OCC sequence, the fourth OCC sequence is different from the fifth OCC sequence, and the third OCC sequence is different from the fifth OCC sequence. The sequence formed by OCC7 and OCC8 can also be called the third OCC sequence, the sequence formed by OCC9 and OCC10 is called the fourth OCC sequence, and the sequence formed by OCC11 and OCC12 is called the fifth OCC sequence. In this case, the third OCC sequence is different from the fourth OCC sequence, the fourth OCC sequence is different from the fifth OCC sequence, and the third OCC sequence is different from the fifth OCC sequence.

[0732] In some embodiments, one 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 may be the number of scheduled PRBs.

[0733] Take the DMRS configuration type as the first configuration type (Type 1DMRS) and the DMRS time domain position as one symbol as an example. Figure 4 As shown in the figure, in each PRB, DMRS port 0 occupies 6 REs in the frequency domain, and the OCC codes on these 6 REs are {+1, +1, +1, +1, +1, +1}; DMRS port 1 occupies the same 6 REs in the frequency domain, and the OCC codes on these 6 REs are {+1, -1, +1, -1, +1, -1}. This sequence form can be further converted into a cyclic shift representation, for example:

[0734] [1 1 1 1 1 1]·diag(s0)=[1 -1 1 -1 1 -1]

[0735] in, Where diag() means diagonalizing the elements to form a diagonal matrix.

[0736] according to The value of can generate the following sequence:

[0737]

[0738]

[0739] 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}.

[0740] When extended to M PRBs, there are:

[0741]

[0742] Where m is the RE index, i.e., m = 0, 1, 2, 3, 4, 5, ..., 6M-1. φ is the cyclic shift factor.

[0743] Similarly, it can be concluded that the sequence obtained when φ = 2 or φ = 4 is also orthogonal to the above sequence. Therefore, in the embodiment of the present application, 6 orthogonal sequences can be constructed on one DMRS symbol.

[0744] In actual implementation, in CDM group 0, if the value of φ is any two of {1, 2, 4, 5}, then combined with the original OCC sequence (i.e., φ = 0 or φ = 3), 4 orthogonal sequences can be constructed. Further considering the time domain OCC, two DMRS symbols can construct 8 orthogonal sequences, and two CDM groups can support 16 orthogonal DMRS ports. If the value of φ is all of {1, 2, 4, 5}, a maximum of 24 orthogonal DMRS ports can be constructed. 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:

[0745]

[0746] k=4n+2k′+Δ

[0747] k′=0,1

[0748]

[0749]

[0750] n=0,1,…

[0751] j=0,1,…,v-1

[0752] Among them, 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; M is an integer greater than or equal to 1, for example, it can be the number of PRBs, and φ is the cyclic shift factor.

[0753] In other embodiments, still taking the DMRS configuration type as the first configuration type (Type 1 DMRS) and the DMRS time domain position as one symbol as an example, Figure 4 As shown in the figure, in each PRB, DMRS port 0 occupies 6 REs in the frequency domain, and the OCC codes on these 6 REs are {+1,+1,+1,+1,+1,+1}; DMRS port 1 occupies 6 identical REs in the frequency domain, and the OCC codes on these 6 REs are {+1,-1,+1,-1,+1,-1}. This sequence form can be further converted into a cyclic shift representation. When the number of scheduled RBs is N and 6N is a multiple of 4, the REs corresponding to the same DMRS port can be grouped into every 4 REs to construct the OCC codes on different ports. That is:

[0754] [1 1 1 1]·diag(s0)=[1-1 1-1]

[0755] in, Where diag() means diagonalizing the elements to form a diagonal matrix.

[0756] When φ=0 and φ=2, the OCC codes of DMRS ports 0 and 1 in CDM group 0 are the same as those of DMRS ports 2 and 3 in CDM group 1. When φ=1 and φ=3, the OCC codes corresponding to the newly added ports are as follows:

[0757] The OCC code for the newly added DMRS port 8 is: [1 1 1 1]·diag(s0)=[1j-1-j](φ=1);

[0758] The OCC code for the newly added DMRS port 9 is: [1 1 1 1]·diag(s0)=[1-j-1j](φ=3);

[0759] And so on.

[0760] Optionally, the transmitting device may map the demodulation reference signal sequence to the time domain resource of the demodulation reference signal according to the following formula:

[0761]

[0762] k=4n+2k′+Δ

[0763] k′=0,1

[0764]

[0765]

[0766] n=0,1,…

[0767] Among them, 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.

[0768] Figure 12 This diagram illustrates the OCC codes used when mapping DMRS to REs. As shown, REs corresponding to the same DMRS port are grouped into groups of four to construct OCC codes for different ports. Ports 0 and 1 correspond to the same REs, but because they have different φs (i.e., use different OCC codes), orthogonality is achieved.

[0769] In some embodiments, based on the above formula (12) or formula (13), the process in 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:

[0770] 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 resource is k and the symbol index is l;

[0771] Step 2: The transmitting device obtains the data of the demodulation reference signal sequence mapped on the first RE (k, l) according to the frequency domain offset, frequency domain OCC, time domain OCC and cyclic shift factor of the CDM group. The data mapped on the first RE (k, l) The above formula (12) or formula (13) is satisfied.

[0772] Based on the above cyclic shift principle, in an embodiment of the present application, a 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. Based on the above configuration information table, 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, and cyclically shifts the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0773] The following describes the implementation process of the embodiment of the present application by combining formula (12) or formula (13) that needs to be satisfied in the above-mentioned mapping process, and combining the setting method of the above-mentioned demodulation reference signal configuration information table, taking the DMRS with the configuration type of the first configuration type (Type 1 DMRS) as an example.

[0774] In some embodiments of the present application, a configuration information table may be set for DMRS, including 16 DMRS port indexes and the CDM group frequency domain offset, OCC, and cyclic shift factor corresponding to each DMRS port index, as shown in Table 19.

[0775] Table 19: Parameters for PUSCH DM-RS configuration type 1

[0776]

[0777] According to Table 19, the OCC of port 8 in CDM group 0 is obtained by performing a cyclic shift based on the OCC of port 0 in the CDM group and a cyclic shift factor of φ=1; the OCC of port 9 in CDM group 0 is obtained by performing a cyclic shift based on the OCC of port 0 in the CDM group and a cyclic shift factor of φ=5; the OCC of port 12 in CDM group 0 is obtained by performing a cyclic shift based on the OCC of port 4 in the CDM group and a cyclic shift factor of φ=1; the OCC of port 13 in CDM group 0 is obtained by performing a cyclic shift based on the OCC of port 4 in the CDM group and a cyclic shift factor of φ=5. The OCC of port 10 in CDM group 1 is obtained by performing a cyclic shift on the OCC of port 2 in the CDM group based on a cyclic shift factor of φ=1; the OCC of port 11 in CDM group 1 is obtained by performing a cyclic shift on the OCC of port 2 in the CDM group based on a cyclic shift factor of φ=5; the OCC of port 14 in CDM group 1 is obtained by performing a cyclic shift on the OCC of port 6 in the CDM group based on a cyclic shift factor of φ=1; the OCC of port 15 in CDM group 1 is obtained by performing a cyclic shift on the OCC of port 7 in the CDM group based on a cyclic shift factor of φ=1.

[0778] In some embodiments of the present application, a configuration information table may be set for DMRS, including 16 DMRS port indexes and the CDM group frequency domain offset, OCC, and cyclic shift factor corresponding to each DMRS port index, as shown in Table 20.

[0779] Table 20: Parameters for PUSCH DM-RS configuration type 1

[0780]

[0781] In some embodiments of the present application, optionally, the transmitting device may map the demodulation reference signal sequence to the time domain resource of the demodulation reference signal according to the following formula:

[0782]

[0783] k=4n+2k′+Δ

[0784] k′=0,1

[0785] Or t=mod(n,2)

[0786]

[0787] n=0,1,…

[0788] j=0,1,…,v-1

[0789] Based on the above formula, the OCC code corresponding to each port is shown in Table 21.

[0790] Table 21: Parameters for PUSCH DM-RS configuration type 1

[0791]

[0792] It should be noted that Tables 19 to 21 only exemplify several types of DMRS configuration information. Based on the above-mentioned principle of cyclic shift, the DMRS configuration information table may be in other forms, which are not listed one by one again.

[0793] It should also be noted that Table 19 and Table 20 are described by taking 16 ports as an example. According to the above principle of cyclic shift, the number of ports in the DMRS configuration information table can be expanded to 24 at most.

[0794] In some embodiments of the present application, the transmitting device may further indicate the port index of the demodulation reference signal configured for the terminal device to the terminal device. Specifically, taking the downlink transmitted DMRS as an example, the network device may send indication information of the demodulation reference signal port index to the terminal device via DCI.

[0795] In an embodiment of the present application, the correspondence table between demodulation reference signal port index indication information and demodulation reference signal ports may be expanded, and corresponding reference signal port index indication information may be set for the newly added demodulation reference signal ports in the embodiment of the present application.

[0796] Furthermore, in order to save signaling overhead, in an embodiment of the present application, joint encoding may be performed on multiple demodulation reference signal port indexes, thereby using fewer bits of indication information to indicate the multiple demodulation reference signal port indexes.

[0797] Taking DMRS as an example and adopting the first configuration type (Type 1 DMRS), the correspondence table between the expanded DMRS port index indication information and the DMRS port index in the embodiment of the present application is described below.

[0798] Table 22 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 1, provided in an embodiment of the present application. rand = 1 indicates that the number of transmission layers is 1, and the transmitting device configures 1 DMRS port for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0799] Table 22: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=1)

[0800]

[0801] Table 22 shows the values ​​of the port index indication information corresponding to DMRS port indexes 0 to 15, where 14 to 21 are newly added indication information based on the original indication information in the embodiment of the present application, indicating DMRS port indexes 8 to 15 respectively. The present application does not exclude the use of other methods to indicate the DMRS port index.

[0802] Table 23 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 2, provided in an embodiment of the present application. rand = 2 indicates that the number of transmission layers is 2, and the transmitting device configures 2 DMRS ports for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0803] Table 23: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=2)

[0804]

[0805] Table 23 shows the values ​​of the port index indication information corresponding to DMRS port indices 0 to 15, where 10 to 17 are newly added indication information based on the original indication information in the embodiment of the present application, respectively indicating port combinations with DMRS port indices greater than or equal to 8. The present application does not exclude the use of other methods to indicate DMRS port indices.

[0806] Table 24 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 3, provided in an embodiment of the present application. rand = 3 indicates that the number of transmission layers is 3, and the transmitting device configures 3 DMRS ports for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0807] Table 24: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=3)

[0808]

[0809] Table 24 shows the values ​​of the port index indication information corresponding to DMRS port indices 0 to 15, where 3 to 7 are newly added indication information based on the original indication information in the embodiment of the present application, respectively indicating port combinations with DMRS port indices greater than or equal to 8. The present application does not exclude the use of other methods to indicate DMRS port indices.

[0810] Table 25 illustrates an exemplary correspondence between DMRS port index indication information and DMRS port index when rank = 4, provided in an embodiment of the present application. rand = 4 indicates that the number of transmission layers is 4, and the transmitting device configures 4 DMRS ports for the receiving device. maxLength indicates the maximum number of DMRS leading symbols.

[0811] Table 25: Correspondence between DMRS port index indication information and DMRS port index (Antenna port(s), transform precoder is disabled, dmrs-Type=1, maxLength=2, rank=4)

[0812]

[0813] Table 25 shows the values ​​of the port index indication information corresponding to DMRS port indices 0 to 15, where 4 to 6 are newly added indication information based on the original indication information in the embodiment of the present application, respectively indicating port combinations with DMRS port indices greater than or equal to 8. The present application does not exclude the use of other methods to indicate DMRS port indices.

[0814] See Figure 13As shown in FIG, a flow chart 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 in the figure can also be applied to other network architectures, and this application does not limit this. Figure 1 In 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 the method may be a receiving device Figure 1 For uplink demodulation reference signal transmission, the transmitting device involved in this method may be Figure 1 The terminal device (102a-102d) in the method may be a receiving device Figure 1 The network device 101 in FIG.

[0815] See Figure 13 As shown, the method may include the following processing flow:

[0816] S1201: A receiving device receives a demodulation reference signal sent by a transmitting device on a time-frequency resource of the demodulation reference signal.

[0817] The demodulation reference signal and the related instructions of the sending device sending the demodulation reference signal can be found in Figure 11 Related content in .

[0818] S1202: The receiving device obtains the sequence of the demodulation reference signal.

[0819] In some embodiments, the receiving device is configured with a demodulation reference signal configuration information table. For details about the configuration information table, see Figure 11 The receiving device may process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain a sequence of the demodulation reference signal. Specifically, the process may include the following steps:

[0820] 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, wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l;

[0821] 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 and the cyclic shift factor. The data mapped on the first RE (k, l) The above formula (12) or formula (13) or formula (14) is satisfied.

[0822] In some embodiments, a receiving device receives indication information of a demodulation reference signal port index in a first CDM group sent by a sending device, thereby obtaining a demodulation reference signal port index allocated by the sending device based on the indication information of the demodulation reference signal port index, and queries the configuration information table of the above-mentioned demodulation reference signal based on the demodulation reference signal port index and the CDM group to which it belongs, obtains an OCC code, and then calculates a sequence of the demodulation reference signal based on a mapping formula of the demodulation reference signal.

[0823] According to the above-described embodiments of the present application, the number of orthogonal DMRS ports can be increased without additional DMRS overhead. Furthermore, the present application is compatible with existing receiving devices, allowing multi-user pairing between the new receiving device provided by the present application and a receiving device that only supports existing standard capabilities, without requiring hardware or software updates to the existing receiving devices. The expansion of DMRS orthogonal ports enables multi-user orthogonal pairing for more layers in the uplink or downlink, which helps improve system capacity.

[0824] Based on the same inventive concept, the embodiment of the present application further provides a communication device, which may have the following Figure 14 In the structure shown, the communication device can be the transmitting device in the above embodiment, or can be a chip or chip system that can support the above transmitting device to implement the above method. When the communication device is the transmitting device in the above embodiment, it has the behavioral functions of the transmitting device in the above method embodiment. For downlink demodulation reference signal transmission, the communication device can be a network device, and for uplink demodulation reference signal transmission, the communication device can be a terminal device.

[0825] like Figure 14 As shown, the communication device 1300 may include a processing unit 1301 and a transceiver unit 1302. The communication device 1300 may also include a storage unit 1303, which may be coupled to the processing unit 1301 and used to store programs and instructions required for the processing unit 1301 to perform functions.

[0826] Based on the above Figure 14 The communication device shown can realize Figure 3 The method shown.

[0827] Specifically, in some embodiments, the processing unit 1301 may be configured to generate a sequence of demodulation reference signals, wherein the demodulation reference signals are used to estimate 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 for transmission. The time-frequency resources include 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 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.

[0828] Furthermore, 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.

[0829] 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, wherein 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.

[0830] 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 demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, and the OCC includes the frequency domain OCC and the time domain OCC; the second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, and the OCC includes the frequency domain OCC and the time domain OCC, and the frequency domain OCC includes the first group of OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

[0831] Furthermore, in some embodiments, the processing unit 1301 is further configured to: obtain, 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.

[0832] Further, in some embodiments, the processing unit 1301 is configured to: obtain, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to the first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain, according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC, 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) The above formula (4) is satisfied.

[0833] Furthermore, 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.

[0834] Furthermore, 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.

[0835] Based on the above Figure 14 The communication device shown can realize Figure 7 The method shown.

[0836] 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 the first channel; and 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 for transmission. The time-frequency resources include 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; and the time domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, where the first group of symbols corresponds to a first group of OCCs, and the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs are orthogonal to the second group of OCCs.

[0837] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

[0838] 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, 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 demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the time domain OCC is the first group of OCC; the second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the time domain OCC is the second group of OCC.

[0839] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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 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.

[0840] 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, 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 demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the frequency domain OCC is the first group of OCC; the second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the frequency domain OCC is the second group of OCC.

[0841] 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.

[0842] Further, in some embodiments, the processing unit 1301 maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal, including: obtaining, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to the first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtaining, 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). The data mapped on the first RE (k, l) The above formula (6) or formula (7) is satisfied.

[0843] Furthermore, 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.

[0844] 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 contained in the first group of symbols or the second group of symbols, and the first group of symbols and the second group of symbols contain the same number of symbols.

[0845] Based on the above Figure 14 The communication device shown can realize Figure 10 The method shown.

[0846] 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 the first channel; and 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 for transmission. The RE corresponding to the first port of the demodulation reference signal in the first CDM group uses a first OCC, and the RE corresponding to the second port of the demodulation reference signal in the first CDM group uses a second OCC, where the second OCC is obtained by cyclic shifting the first OCC, and the first OCC is orthogonal to the second OCC.

[0847] Furthermore, in some embodiments, the configuration information table of the demodulation reference signal includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC includes a frequency domain OCC and a time domain OCC.

[0848] Further, in some embodiments, the processing unit 1301 is configured to: obtain 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 cyclically shift the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0849] Further, in some embodiments, the processing unit 1301 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 the first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain, according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC, and the cyclic shift factor, 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) The above formula (12) or the above formula (13) or the above formula (14) is satisfied.

[0850] Furthermore, 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.

[0851] Furthermore, 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.

[0852] In addition, the embodiment of the present application also provides a communication device, which can have the following Figure 15 In the structure shown, the communication device can be a transmitting device, or a chip or chip system that can support the transmitting device to implement the above method. For downlink demodulation reference signal transmission, the communication device can be a network device, and for uplink demodulation reference signal transmission, the communication device can be a terminal device.

[0853] like Figure 15 The communication device 1400 shown may include at least one processor 1402, and the at least one processor 1402 is used to couple with a memory, read and execute instructions in the memory to implement the steps involved in the sending device in the method provided in the embodiment of the present application. Optionally, the communication device 1400 may also 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-mentioned transceiver unit 1302. For example, the transceiver 1401 can be used for the communication device 1400 to perform the following steps: Figure 3 、 Figure 7 or Figure 10 In the step of generating a demodulation reference signal sequence in the method shown in FIG. 1 , the processor 1402 may be used to implement the functions of the processing unit 1301. For example, the processor 1402 may be used to enable the communication device 1400 to execute the following steps: Figure 3 、 Figure 7 or Figure 10 The method shown is a step of mapping the demodulation reference signal sequence to the time-frequency resources. In addition, the transceiver 1401 can be coupled to the antenna 1403 to support the communication device 1400 to communicate. Optionally, the communication device 1400 may further include a memory 1404, in which computer programs and instructions are stored. The memory 1404 may 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 in the embodiment of the present application; in addition, the memory 1404 can also be used to store data involved in the embodiment of the method of the present application, for example, for storing data and instructions necessary to support the transceiver 1401 to implement interaction, and / or for storing the configuration information necessary for the communication device 1400 to execute the method described in the embodiment of the present application.

[0854] Based on the same inventive concept, the embodiment of the present application further provides a communication device, which may have the following Figure 16 In the structure shown, the communication device can be the receiving device in the above embodiment, or can be a chip or chip system that can support the above receiving device to implement the above method. When the communication device is the receiving device in the above embodiment, it has the behavioral functions of the receiving device in the above method embodiment. For downlink demodulation reference signal transmission, the communication device can be a terminal device, and for uplink demodulation reference signal transmission, the communication device can be a network device.

[0855] like Figure 16 As shown, the communication device 1500 may include a processing unit 1501 and a transceiver unit 1502. The communication device 1500 may also include a storage unit 1503, which may be coupled to the processing unit 1501 and used to store programs and instructions required for the processing unit 1501 to perform functions.

[0856] Based on the above Figure 16 The communication device shown can realize Figure 6 The method shown.

[0857] Specifically, in some embodiments, the transceiver unit 1502 may be configured to receive a demodulation reference signal sent by a transmitting device on a time-frequency resource of a demodulation reference signal, wherein the demodulation reference signal is used to estimate the channel state of the first channel; and the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signal. The time-frequency resources include frequency domain resources corresponding to a first CDM group, wherein 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 a first group of orthogonal spread spectrum 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.

[0858] Furthermore, 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.

[0859] 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, wherein 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.

[0860] 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 demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, and the OCC includes the frequency domain OCC and the time domain OCC; the second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, and the OCC includes the frequency domain OCC and the time domain OCC, and the frequency domain OCC includes the first group of OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

[0861] Furthermore, in some embodiments, the processing unit 1501 is further configured to: obtain, 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.

[0862] 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, and a time domain OCC corresponding to the first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain, according to the CDM group frequency domain offset, the frequency domain OCC, and the time domain OCC, 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) The above formula (4) is satisfied.

[0863] Further, in some embodiments, the processing unit 1301 is configured to receive indication information of the demodulation reference signal port index in the first CDM group sent by the transmitting device.

[0864] Furthermore, 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.

[0865] Based on the above Figure 16 The communication device shown can realize Figure 11 The method shown.

[0866] Specifically, in some embodiments, the transceiver unit 1502 may be configured to receive a demodulation reference signal sent by a transmitting device on a time-frequency resource of a demodulation reference signal, wherein the demodulation reference signal is used to estimate the channel state of the first channel; and the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signal. The time-frequency resources include frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; and the time domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, wherein the first group of symbols corresponds to a first group of OCCs, and the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs are orthogonal to the second group of OCCs.

[0867] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

[0868] 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, 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 demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the time domain OCC is the first group of OCC; the second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the time domain OCC is the second group of OCC.

[0869] Further, in some embodiments, the configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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 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.

[0870] 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, 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 demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the frequency domain OCC is the first group of OCC; the second information configuration table includes the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCC, the OCC includes the frequency domain OCC and the time domain OCC, and the frequency domain OCC is the second group of OCC.

[0871] Further, in some embodiments, the processing unit 1501 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.

[0872] Further, in some embodiments, the processing unit 1501 maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal, including: obtaining, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to the first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtaining, 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). The data mapped on the first RE (k, l) The above formula (6) or formula (7) is satisfied.

[0873] Furthermore, in some embodiments, the processing unit 1501 is configured to receive port index indication information of the demodulation reference signal sent by the sending device.

[0874] 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 contained in the first group of symbols or the second group of symbols, and the first group of symbols and the second group of symbols contain the same number of symbols.

[0875] Based on the above Figure 16 The communication device shown can realize Figure 13 The method shown.

[0876] Specifically, in some embodiments, the transceiver unit 1502 may be configured to receive a demodulation reference signal sent by a transmitting device on a time-frequency resource of a demodulation reference signal, where the demodulation reference signal is used to estimate the channel state of the first channel; and the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signal. The RE corresponding to the first port of the demodulation reference signal in the first CDM group uses a first OCC, and the RE corresponding to the second port of the demodulation reference signal in the first CDM group uses a second OCC, where the second OCC is obtained by cyclic shifting the first OCC, and the first OCC is orthogonal to the second OCC.

[0877] Furthermore, in some embodiments, the configuration information table of the demodulation reference signal includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC includes a frequency domain OCC and a time domain OCC.

[0878] Further, in some embodiments, the processing unit 1501 is configured to: obtain 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 cyclically shift the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

[0879] 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 the first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; obtain, according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC, and the cyclic shift factor, 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) The above formula (12) or the above formula (13) or the above formula (14) is satisfied.

[0880] Furthermore, 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.

[0881] Furthermore, 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.

[0882] In addition, the embodiment of the present application also provides a communication device, which can have the following Figure 17 In the structure shown, the communication device can be a receiving device, or a chip or chip system that can support the receiving device to implement the above method. For downlink demodulation reference signal transmission, the communication device can be a terminal device, and for uplink demodulation reference signal transmission, the communication device can be a network device.

[0883] like Figure 17 The communication device 1600 shown may include at least one processor 1602, and the at least one processor 1602 is used to couple with a memory, read and execute instructions in the memory to implement the steps involved in the receiving device in the method provided in the embodiment of the present application. Optionally, the communication device 1600 may also 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 can be used to implement the functions of the above-mentioned transceiver unit 1502. For example, the transceiver 1601 can be used for the communication device 1600 to perform the following steps: Figure 6 、 Figure 10 or Figure 13 In the step of receiving the demodulation reference signal in the method shown in FIG. 1 , the processor 1602 may be used to implement the functions of the processing unit 1501. For example, the processor 1602 may be used to enable the communication device 1600 to perform the following steps: Figure 6 、 Figure 10 or Figure 13 The steps of obtaining a 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 in calling the computer programs and instructions in the memory 1604 to implement the steps involved in the receiving device in the method provided in the embodiment of the present application; in addition, the memory 1604 can also be used to store data involved in the embodiment of the method of the present application, for example, for storing data and instructions necessary to support the transceiver 1601 to implement interaction, and / or for storing configuration information necessary for the communication device 1600 to execute the method described in the embodiment of the present application.

[0884] Based on the same concept as the above method embodiment, the present embodiment further provides a computer-readable storage medium having stored thereon instructions that, when called and executed by a computer, enable the computer to perform the methods involved in the above method embodiment and any possible design of the method embodiment. In the present embodiment, the computer-readable storage medium is not limited and may be, for example, RAM (random-access memory), ROM (read-only memory), etc.

[0885] Based on the same concept as the above method embodiment, the present application also provides a computer program product, which, when called and executed by a computer, can complete the method embodiment and the methods involved in any possible design of the above method embodiment.

[0886] Based on the same concept as the above-mentioned method embodiment, the present application also provides a chip, which may include a processor and an interface circuit, for completing the methods involved in the above-mentioned method embodiment and any possible implementation of the method embodiment, wherein "coupling" refers to the direct or indirect combination of two components with each other, and 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.

[0887] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented 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, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0888] The various illustrative logic units and circuits described in the embodiments of the present application can be implemented or operated by a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, a discrete hardware component, or the design of any combination thereof. The general-purpose processor can be a microprocessor, alternatively, the general-purpose processor can also be any traditional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration to implement.

[0889] The steps of the methods or algorithms described in the embodiments of the present application can be directly embedded in hardware, software units executed by a processor, or a combination of the two. The software units can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. For example, the storage medium can be connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and storage medium can be provided in an ASIC, which can be provided in a terminal device. Alternatively, the processor and storage medium can also be provided in different components in the terminal device.

[0890] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0891] Although the present invention has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations thereof may be made without departing from the scope of the invention. Accordingly, this specification and drawings are merely illustrative of the invention as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. It will be apparent that those skilled in the art may make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, the invention is intended to encompass such modifications and variations as fall within the scope of the claims and their equivalents.

Claims

1. A signal transmission method, characterized in that: include: The sending device receives first information, where the first information is used to determine frequency domain resources corresponding to the first code division multiplexing (CDM) group; The transmitting device generates a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate a channel state of a first channel; The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it; the time-frequency resources include the frequency domain resources corresponding to the first code division multiplexing CDM group, wherein 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 respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spread spectrum 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.

2. The method according to claim 1, wherein The configuration information table of the demodulation reference signal includes a demodulation reference signal port index, a CDM group frequency domain offset, and a correspondence between OCCs, wherein the OCCs include frequency domain OCCs and time domain OCCs, and the frequency domain OCCs include a first group of OCCs and a second group of OCCs.

3. The method according to claim 1, wherein 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 a 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; 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 OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

4. The method according to claim 2 or 3, wherein: Mapping, by the transmitting device, the sequence of the demodulation reference signal onto the time-frequency resource of the demodulation reference signal includes: The transmitting device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; 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 signal mapped on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 t=mod(n,2) n＝0,1,… j=0,1,…,v-1 Among them, 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; wherein, when t=0, the frequency domain OCC is the first group of OCCs; t=1, the frequency domain OCC is the second group of OCCs.

5. A signal transmission method, characterized in that: include: The sending device receives first information, where the first information is used to determine frequency domain resources and time domain resources corresponding to the first code division multiplexing (CDM) group; The transmitting device generates a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate a channel state of a first channel; The transmitting device maps the sequence of the demodulation reference signal to the time-frequency resources of the demodulation reference signal and sends it; the time-frequency resources include frequency domain resources corresponding to a first code division multiplexing (CDM) group, wherein 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 orthogonal spread spectrum codes (OCC), the second group of symbols corresponds to a second group of OCC, and the first group of OCC is orthogonal to the second group of OCC.

6. The method according to claim 5, wherein The configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

7. The method according to claim 6, wherein Mapping, by the transmitting device, the sequence of the demodulation reference signal onto the time-frequency resource of the demodulation reference signal includes: The transmitting device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; 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 signal mapped on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 s＝0,1 n＝0,1,… j=0,1,…,v-1 Among them, 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; when s=0, the time domain OCC is the first group of OCCs; when s=1, the time domain OCC is the second group of OCCs.

8. The method according to claim 5, wherein The configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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 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.

9. The method according to claim 8, wherein Mapping, by the transmitting device, the sequence of the demodulation reference signal onto the time-frequency resource of the demodulation reference signal includes: The transmitting device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; 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 signal mapped on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 s＝0,1 n＝0,1,… j=0,1,…,v-1 Among them, 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; 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.

10. A signal transmission method, characterized in that: include: The sending device receives first information, where the first information is used to determine frequency domain resources corresponding to the first code division multiplexing (CDM) group; The transmitting device generates a sequence of demodulation reference signals, where the demodulation reference signals are used to estimate a channel state of a first channel; The sending device maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal and sends it; in: The time-frequency resources include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of a demodulation reference signal in a first code division multiplexing (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 physical resource block (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, 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; The orthogonal spread spectrum OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the first port forms a first OCC code sequence, the OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the second port forms a second OCC code sequence, the OCC code used on the REs corresponding to two subcarriers in the first subcarrier group by the frequency domain resources corresponding to the first port or the second port forms a third OCC code sequence, and the OCC code used on the REs corresponding to two subcarriers in the second subcarrier group forms a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by cyclic shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

11. The method according to claim 10, wherein The configuration information table of the demodulation reference signal includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC includes a frequency domain OCC and a time domain OCC; The method further comprises: The transmitting 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 cyclically shifts the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

12. The method according to any one of claims 10-11, characterized in that Mapping, by the transmitting device, the sequence of the demodulation reference signal onto the time-frequency resource of the demodulation reference signal includes: The transmitting device obtains, 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), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; According to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 n＝0,1,… j=0,1,…,v-1 Alternatively, the data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 n＝0,1,… j=0,1,…,v-1 Among them, 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.

13. A signal transmission method, characterized in that: include: The receiving device sends first information, where the first information is used to determine frequency domain resources corresponding to the first code division multiplexing (CDM) group; The receiving device receives, on a time-frequency resource of the demodulation reference signal, a demodulation reference signal sent by a transmitting device, where the demodulation reference signal is used to estimate a channel state of a first channel; the time-frequency resource includes a frequency domain resource corresponding to a first code division multiplexing (CDM) group, wherein 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 resource 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 two 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 OCCs, and the first group of OCCs is orthogonal to the second group of OCCs; The receiving device obtains a sequence of the demodulation reference signal.

14. The method according to claim 13, wherein The configuration information table of the demodulation reference signal includes a demodulation reference signal port index, a CDM group frequency domain offset, and a correspondence between OCCs, wherein the OCCs include frequency domain OCCs and time domain OCCs, and the frequency domain OCCs include a first group of OCCs and a second group of OCCs.

15. The method according to claim 13, wherein 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 a 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; 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 OCC and the second group of OCC, and the demodulation reference signal port index included in the second configuration information table and the first configuration information table is different.

16. The method according to claim 14 or 15, characterized in that The receiving device obtains the sequence of the demodulation reference signal, including: The receiving device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 t=mod(n,2) n＝0,1,… j=0,1,…,v-1 Among them, 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; wherein, when t=0, the frequency domain OCC is the first group of OCCs; t=1, the frequency domain OCC is the second group of OCCs.

17. A signal transmission method, characterized in that: include: The receiving device sends first information, where the first information is used to determine frequency domain resources and time domain resources corresponding to the first code division multiplexing (CDM) group; The receiving device receives, on a time-frequency resource of the demodulation reference signal, a demodulation reference signal sent by the transmitting device, where the demodulation reference signal is used to estimate a channel state of a first channel; the time-frequency resource includes 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 time domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, where the first group of symbols corresponds to a first group of orthogonal spreading codes (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; The receiving device obtains a sequence of the demodulation reference signal.

18. The method according to claim 17, wherein The configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

19. The method according to claim 18, wherein The receiving device obtains the sequence of the demodulation reference signal, including: The receiving device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 s＝0,1 n＝0,1,… j=0,1,…,v-1 Among them, 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; when s=0, the time domain OCC is the first group of OCCs; when s=1, the time domain OCC is the second group of OCCs.

20. The method of claim 17, wherein: The configuration information table of the demodulation reference signal includes the demodulation reference signal type, the demodulation reference signal port index, the CDM group frequency domain offset and the correspondence between the OCCs, wherein 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.

21. The method according to claim 20, wherein The receiving device obtains the sequence of the demodulation reference signal, including: The receiving device obtains, according to the configuration information table, a CDM group frequency domain offset, a frequency domain OCC, and a time domain OCC corresponding to a first RE (k, l), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; According to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 s＝0,1 n＝0,1,… j=0,1,…,v-1 Among them, 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; 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.

22. A signal transmission method, characterized in that: include: The receiving device sends first information, where the first information is used to determine frequency domain resources corresponding to the first code division multiplexing (CDM) group; The receiving device receives a demodulation reference signal sent by the sending device on a time-frequency resource of the demodulation reference signal, where the demodulation reference signal is used to estimate a channel state of the first channel; The receiving device obtains a sequence of the demodulation reference signal; in: The time-frequency resources include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of a demodulation reference signal in a first code division multiplexing (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 physical resource block (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, 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; The orthogonal spread spectrum OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the first port forms a first OCC code sequence, the OCC code used on the REs corresponding to all subcarriers in the at least two subcarrier groups by the frequency domain resources corresponding to the second port forms a second OCC code sequence, the OCC code used on the REs corresponding to two subcarriers in the first subcarrier group by the frequency domain resources corresponding to the first port or the second port forms a third OCC code sequence, and the OCC code used on the REs corresponding to two subcarriers in the second subcarrier group forms a fourth OCC code sequence; wherein, the second OCC code sequence is obtained by cyclic shifting the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

23. The method according to claim 22, wherein The configuration information table of the demodulation reference signal includes a correspondence between a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC includes a frequency domain OCC and a time domain OCC; The method further comprises: 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 cyclically shifts the obtained frequency domain OCC and time domain OCC according to the obtained cyclic shift factor.

24. The method according to claim 22 or 23, wherein: The receiving device obtains the sequence of the demodulation reference signal, including: The receiving device obtains, 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), wherein the subcarrier index of the first RE (k, l) in the time-frequency resource is k and the symbol index is l; According to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor, the data of the sequence mapping of the demodulation reference signal on the first RE (k, l) is obtained. The data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 n＝0,1,… j=0,1,…,v-1 Alternatively, the data mapped on the first RE (k, l) satisfy: k=4n+2k ′ +D k ′ ＝0,1 n＝0,1,… j=0,1,…,v-1 Among them, 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.

25. A communication device, characterized in that: The device comprises at least one processor connected to a memory, and the at least one processor is used to read and execute a program stored in the memory, so that the device executes the method according to any one of claims 1 to 4.

26. A communication device, characterized in that: The device comprises at least one processor connected to a memory, and the at least one processor is used to read and execute a program stored in the memory, so that the device executes the method according to any one of claims 5 to 9.

27. A communication device, characterized in that: The device comprises at least one processor connected to a memory, and configured to read and execute a program stored in the memory, so that the device executes the method according to claim 10 or 11.

28. A communication device, characterized in that: The device comprises at least one processor connected to a memory, and the at least one processor is used to read and execute a program stored in the memory, so that the device executes the method according to any one of claims 13 to 16.

29. A communication device, characterized in that: The device comprises at least one processor connected to a memory, and the at least one processor is used to read and execute a program stored in the memory, so that the device executes the method according to any one of claims 17 to 21.

30. A communication device, characterized in that: The device comprises at least one processor connected to a memory, and configured to read and execute a program stored in the memory, so that the device performs the method according to claim 22 or 23.

31. A chip, characterized in that: 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 claims 1 to 24.

32. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the instructions are executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 24.

33. A computer program product, characterized in that When the computer program product is called by a computer, it enables the computer to execute the method according to any one of claims 1 to 24.

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