Systems and methods for reference signaling for wireless communications

Abstract

A system and method for wireless communication are presented. In one aspect, a wireless communication device determines a first demodulation reference signal (DMRS) table according to first information from a wireless communication node. In one aspect, the wireless communication device receives a value of a field in a signaling from the wireless communication node. In one aspect, the wireless communication device determines a first DMRS parameter according to the first DMRS table and the value of the field. In one aspect, the first DMRS table includes a mapping between a value of a field of the signaling and a value of the first DMRS parameter.

Description

[Technical Field]

[0001] Technical Field The present disclosure relates generally to wireless communications, including, but not limited to, systems and methods for indicating demodulation reference signal ports for wireless communications and supporting a larger number of demodulation reference signal (DMRS) ports. [Background technology]

[0002] background The 3rd Generation Partnership Project (3GPP®), a standards organization, is currently defining a new air interface called 5G New Radio (5G NR) and the Next Generation Packet Core Network (NG-CN or NGC). 5G NR has three main components: the 5G Access Network (5G-AN), the 5G Core Network (5GC), and the User Equipment (UE). To facilitate the enablement of different data services and requirements, the elements of the 5GC, also known as network functions, have been simplified; some of them are software-based and some are hardware-based, so they can be adapted as needed. Summary of the Invention [Means for solving the problem]

[0003] overview The exemplary embodiments disclosed herein are directed to solving problems associated with one or more problems presented in the prior art, as well as providing additional features that will become readily apparent from a review of the following detailed description in conjunction with the accompanying drawings. In accordance with various embodiments, exemplary systems, methods, devices, and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example, and not limitation, and it will be apparent to those skilled in the art upon reading this disclosure that various modifications to the disclosed embodiments may be made while remaining within the scope of the present disclosure.

[0004] At least one aspect relates to a system, method, apparatus, or computer-readable medium for wireless communication between a wireless communication node and a wireless communication device. In some embodiments, the wireless communication node is a base station or a transmit / receive point (TRP). In some embodiments, the wireless communication device is a user equipment (UE).

[0005] In some embodiments, the wireless communication device determines a first demodulation reference signal (DMRS) table according to first information from a wireless communication node. In some embodiments, the wireless communication device receives a value of a field in signaling from the wireless communication node. In some embodiments, the wireless communication device determines a first DMRS parameter according to the first DMRS table and the value of the field. In some embodiments, the first DMRS table includes a mapping between values ​​of the field of the signaling and values ​​of the first DMRS parameter, wherein each of the values ​​of the field is associated with a respective one of the values ​​of the first DMRS parameter. In some embodiments, the first DMRS table includes a first DMRS parameter having values ​​associated with at least two categories of DMRS ports, where different categories of the at least two categories of DMRS ports correspond to at least one of: different numbers of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one Time Domain Orthogonal Cover Code (TD-OCC), different numbers of DMRS OFDM symbols of one TD-OCC, different numbers of DMRS OFDM symbols within one DMRS OFDM symbol group of one TD-OCC, or different relationships between vectors of one TD-OCC. In some embodiments, each of the DMRS OFDM symbol groups includes one or more consecutive OFDM symbols.

[0006] In some embodiments, there is at least one gap between the symbols of two adjacent DMRS OFDM symbol groups, and the gap is greater than zero OFDM symbols, or at least some OFDM symbols in different DMRS OFDM symbol groups are non-contiguous with respect to each other.

[0007] In some embodiments, the at least two categories of DMRS ports include a first category of DMRS ports and a second category of DMRS ports. In some embodiments, the TD-OCC of the first category of DMRS ports corresponds to one DMRS OFDM symbol group, and the second category of DMRS ports corresponds to X DMRS OFDM symbol groups. In some embodiments, X may be an integer value greater than 1.

[0008] In some embodiments, when a wireless communication device is configured with DMRS Type I and the maximum number of OFDM symbols in one OFDM symbol group is 1, the wireless communication device may determine Y DMRS ports selected from DMRS ports {0 to 3, 8, 9, 10, 11} according to the value of the first DMRS parameter, where Y may be a positive integer value.

[0009] In some embodiments, if the wireless communication device is configured with DMRS Type II and the maximum number of OFDM symbols in an OFDM symbol group is 1, the wireless communication device may determine Y DMRS ports selected from DMRS ports {0 to 5, 12 to 17}, where Y may be a positive integer.

[0010] In some embodiments, when a wireless communication device is configured with DMRS Type I and the maximum number of OFDM symbols in one OFDM symbol group is 2, the wireless communication device may determine Y DMRS ports selected from DMRS ports {0 to 15} according to the value of the first DMRS parameter, where Y may be a positive integer.

[0011] In some embodiments, if the wireless communication device is configured with DMRS Type II and the maximum number of OFDM symbols in an OFDM symbol group is 2, the wireless communication device may determine Y DMRS ports selected from DMRS ports {0 to 23}, where Y may be a positive integer.

[0012] In some embodiments, when the Y DMRS ports include at least one of DMRS ports 8 through 15 and the number of code division multiplexing (CDM) groups with no data is a maximum value, the first DMRS parameter includes the number of CDM groups with no data and the Y DMRS ports.

[0013] In some embodiments, when the Y DMRS ports include at least one of DMRS ports 8 to 15, and the number of DMRS OFDM symbols in one DMRS OFDM symbol group is a maximum value, the first DMRS parameter includes the number of DMRS OFDM symbols in one DMRS OFDM symbol group and the Y DMRS ports.

[0014] In some embodiments, DMRS ports 0-7 are first category DMRS ports and DMRS ports 8-15 are second category DMRS ports. In some embodiments, DMRS ports 0-7 are first category DMRS ports and second category DMRS ports and DMRS ports 8-15 are second category DMRS ports. DMRS ports 0-7 first category DMRS ports and second category DMRS ports may have the same DMRS port index of 0-7.

[0015] In some embodiments, when the Y DMRS ports include at least one of DMRS ports 12 to 23 and the number of CDM groups with no data is a maximum value, the first DMRS parameter includes the number of CDM groups with no data and the Y DMRS ports.

[0016] In some embodiments, when the Y DMRS ports include at least one of DMRS ports 12 to 23, and the number of DMRS OFDM symbols in one DMRS OFDM symbol group is a maximum value, the first DMRS parameter includes the number of DMRS OFDM symbols in one DMRS OFDM symbol group and the Y DMRS ports.

[0017] In some embodiments, DMRS ports 0-11 are first category DMRS ports and DMRS ports 12-23 are second category DMRS ports. In some embodiments, DMRS ports 0-11 are first category DMRS ports and second category DMRS ports and DMRS ports 8-15 are second category DMRS ports. DMRS ports 0-11 first category DMRS ports and second category DMRS ports may have the same DMRS port index of 0-11.

[0018] In some embodiments, the first DMRS parameter includes Y DMRS ports and a number of CDM groups with no data. In some embodiments, the number of CDM groups with no data is determined according to at least one of a category of the Y DMRS ports or a relationship between elements of one TD-OCC. In some embodiments, the value of the first DMRS parameter in the first DMRS table does not include the first value of the number of CDM groups with no data and a DMRS port of the second category. In some embodiments, the relationship between elements of one TD-OCC includes whether the TD-OCC includes X repeating vectors with one or two elements.

[0019] In some embodiments, the number of CDM groups with no data is further determined according to at least one of the indexes of the CDM groups containing Y DMRS ports or the relationship between elements of one TD-OCC. In some embodiments, the value of the first DMRS parameter in the first DMRS table does not include the first value of the number of CDM groups with no data and the DMRS ports of the second category.

[0020] In some embodiments, if the Y DMRS ports include at least one DMRS port of the second category, the number of CDM groups with no data is a maximum value.

[0021] In some embodiments, the maximum value is 2 for Type I DMRS ports. In some embodiments, the maximum value is 3 for Type II DMRS ports.

[0022] In some embodiments, the first DMRS table includes a first DMRS parameter, and satisfies at least one of: the first DMRS parameter includes Y DMRS ports, and the Y DMRS ports associated with one value of the field belong to one of at least two categories; the first DMRS parameter includes Y DMRS ports, and the Y DMRS ports associated with one value of the field belong to more than one of the at least two categories; or the first DMRS parameter includes Y DMRS ports, and at least two categories of DMRS ports are associated with different values ​​of the field.

[0023] In some embodiments, the Y DMRS ports associated with one value of the field belong to more than one of at least two categories of DMRS ports, and more than one of the at least two categories of DMRS ports are in different CDM groups; DMRS ports from one CDM group and the Y DMRS ports belong to one category of DMRS ports; Y DMRS ports belong to one category of DMRS ports for one channel and belong to different categories of DMRS ports for different channels; Y DMRS ports belong to one category of DMRS ports for one channel, and the category of the Y DMRS ports for one channel depends on the first indication; or Y DMRS ports belong to one category of DMRS ports for one channel, and the one category of the Y DMRS ports depends on the total number of DMRS OFDM symbol groups of one transmission opportunity for one channel.

[0024] In some embodiments, the first DMRS parameter includes the number of consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in an OFDM symbol group and Y DMRS ports. In some embodiments, the number of consecutive OFDM symbols in an OFDM symbol group is determined by the categories of the Y DMRS ports. In some embodiments, the values ​​of the first parameter of the first DMRS table do not include the first value of the number of consecutive OFDM symbols in an OFDM symbol group and the DMRS ports of the second category.

[0025] In some embodiments, if the Y DMRS ports include DMRS ports of the second category, the number of CDM groups with no data is 2, and the number of consecutive OFDM symbols in one OFDM symbol group is a maximum value.

[0026] In some embodiments, the first DMRS parameters include the number of consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in an OFDM symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in an OFDM symbol group. In some embodiments, if the Y DMRS ports include second category DMRS ports corresponding to the same element of TD-OCC across multiple DMRS OFDM symbols in an DMRS OFDM symbol group and do not include a DMRS port in CDM group 1, the number of CDM groups with no data is 1 or 2, and the number of consecutive OFDM symbols in an OFDM symbol group is 1 or 2.

[0027] In some embodiments, the first DMRS parameters include the number of consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in an OFDM symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in an OFDM symbol group. In some embodiments, for the same combination of Y DMRS ports including a second DMRS port in CDM group 0 and no DMRS port in CDM group 1, there are four values ​​in the first DMRS table, each corresponding to one of four combinations where the number of CDM groups with no data is 1 or 2 and the number of consecutive OFDM symbols in an OFDM symbol group is 1 or 2. In some embodiments, the second category DMRS ports correspond to the same element of the TD-OCC across multiple DMRS OFDM symbols in one DMRS OFDM symbol group.

[0028] In some embodiments, the first DMRS parameters include the number of consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in an OFDM symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in an OFDM symbol group. In some embodiments, for the same combination of Y DMRS ports including a second DMRS port in CDM group 0 and no DMRS port in CDM group 1, there are two values ​​in the first DMRS table, each corresponding to one of two combinations where the number of CDM groups with no data is 1 or 2 and the number of consecutive OFDM symbols in an OFDM symbol group is 2. In some embodiments, the second category DMRS ports correspond to the same element of the TD-OCC across multiple DMRS OFDM symbols in one DMRS OFDM symbol group.

[0029] In some embodiments, the signaling includes one of Downlink Control Information (DCI) signaling, Radio Access Control (RRC) signaling, or Medium Access Control Element (MAC-CE) signaling.

[0030] In some embodiments, the first DMRS parameters include the number of code division multiplexing (CDM) groups with no data and the Y DMRS ports, and if the maximum number of OFDM symbols in one DMRS OFDM symbol group is greater than 1, the first DMRS parameters further include the number of consecutive OFDM symbols in one OFDM symbol group.

[0031] In some embodiments, if the Y DMRS ports are DMRS ports of a physical downlink shared channel (PDSCH), the first DMRS parameter further includes at least one of: a category of the DMRS port, a category of the DMRS port in a CDM group of the plurality of CDM groups without data, a relationship between categories of DMRS ports in different CDM groups of the plurality of CDM groups without data, or a TD-OCC length of the DMRS port in a CDM group of the plurality of CDM groups without data. In some embodiments, the DMRS port or plurality of DMRS ports is from Y DMRS ports of a channel of the wireless communication device, and / or the DMRS port or plurality of DMRS ports includes DMRS ports of potentially co-scheduled wireless communication devices of the wireless communication device.

[0032] In some embodiments, the number of bits in the field is determined by the first DMRS information. In some embodiments, the first DMRS table is selected from a plurality of tables according to the first information.

[0033] In some embodiments, the first information includes at least one of a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, or a number of DMRS ports. In some embodiments, different DMRS types correspond to different frequency-domain patterns of the DMRS ports.

[0034] In some embodiments, the second DMRS parameter is for indicating whether a second category DMRS port is enabled. In some embodiments, the second DMRS parameter is for indicating whether a DMRS port includes an enabled second category DMRS port. In some embodiments, the second DMRS parameter is a 1-bit parameter. In some embodiments, if the first table includes DMRS ports of a physical uplink shared channel (PUSCH) and the first information is used to select the first table, the first information includes the number of DMRS ports.

[0035] In some embodiments, the first DMRS parameter includes Y DMRS ports. In some embodiments, the method further includes determining, by the wireless communication device, at least one of DMRS port categories of the Y DMRS ports or TD-OCC lengths of DMRS ports of co-scheduled wireless communication devices in different code division multiplexing (CDM) groups according to a total number of OFDM symbol groups included in one transmission opportunity.

[0036] In some embodiments, the first wireless communication device determines at least one of DMRS port categories of the Y DMRS ports or TD-OCC lengths of DMRS ports of co-scheduled wireless communication devices in different CDM groups according to a total number of OFDM symbol groups and the Y DMRS ports included in one transmission opportunity.

[0037] In some embodiments, Y is less than 5 or 9.

[0038] In some embodiments, at least two categories of DMRS ports are indexed together.

[0039] In some embodiments, the index of a DMRS port is determined by first indexing over the DMRS ports of a first category and then indexing over the DMRS ports of a second category, and in some embodiments, the DMRS ports of the first category and some DMRS ports of the second category share the same DMRS port index.

[0040] In some embodiments, if a DMRS port of a first category and some DMRS ports of a second category share the same DMRS port index, the TD-OCC of some DMRS ports of the second category corresponds to X DMRS OFDM symbols and includes X repetitions of the same vector having L elements, where L may be the number of OFDM symbols in one OFDM symbol group. In some embodiments, if the first DMRS table includes Y DMRS ports of a physical uplink shared channel (PUSCH), there is no indication from the wireless communication node indicating the category of DMRS ports having the same DMRS port index. In some embodiments, if the first DMRS table includes Y DMRS ports of a physical downlink shared channel (PDSCH), the first DMRS parameter includes an indication indicating the category of DMRS ports having the same DMRS port index. In some embodiments, if the first DMRS table includes Y DMRS ports of a PDSCH, there is an indication from the wireless communication node indicating the category of DMRS ports having the same DMRS port index. In some embodiments, the category of DMRS ports having the same DMRS port index is determined by the total number of DMRS OFDM symbol groups in one transmission opportunity for one channel.

[0041] In some embodiments, the indication indicating the category of DMRS ports having the same DMRS port index includes at least one of an indication indicating the number of DMRS OFDM symbol groups of DMRS ports having the same DMRS port index, an indication indicating whether the number of DMRS OFDM symbol groups of DMRS ports having the same DMRS port index is greater than one, or an indication indicating the length of the TD-OCC of DMRS ports having the same DMRS port index.

[0042] In some embodiments, the at least two categories of DMRS ports include first category DMRS ports and second category DMRS ports. In some embodiments, the TD-OCC of a first category DMRS port corresponds to one OFDM symbol group, and a second category DMRS port corresponds to X OFDM symbol groups, where X may be an integer value greater than 1. In some embodiments, if a first category DMRS port corresponds to X OFDM symbol groups and a second category DMRS port corresponds to a different TD-OCC across the X OFDM symbol groups, the first category DMRS port corresponds to the same TD-OCC across the X OFDM symbol groups. In some embodiments, the length of the TD-OCC of a first category DMRS port is L, and the length of the TD-OCC of a second category DMRS port is X*L, where L is the number of OFDM symbols in one OFDM symbol group.

[0043] In some embodiments, the wireless communication device comprises: [ka] Determine a sequence of DMRS ports of at least two categories according to: k=4*n+2*k'+Δ or k=6*n+k'+Δ, where k is a subcarrier index; [ka] where l'=0, 1, ..., L-1, where l is the OFDM symbol of DMRS port p, l' is the index of the OFDM symbol in one OFDM symbol group, L is the number of symbols in one OFDM symbol group, k'=0 or 1 is an intermediate parameter for determining the index of DMRS subcarrier k, n includes a non-negative integer value, and w f (k'), w t (l'), and Δ are the number of DMRS ports and w f (k'), w t (l'), and Δ, where w f (k') is FD-OCC, and w t where (l') is the TD-OCC, Δ is the RE offset associated with the CDM group, μ is a parameter related to the subcarrier spacing, p is the number of DMRS ports, and for the first category DMRS ports, w t (l') contains L elements, corresponding to each OFDM symbol group of one transmission opportunity of one channel, or w t (l') contains X*L elements containing X repetitions of one same vector of L elements, and w t (l') corresponds to X OFDM symbol groups, and for the second category DMRS ports, w t (l') contains X*L elements containing X different vectors, each of which contains L elements, and w t (l') corresponds to X OFDM symbol groups, or w t (l') contains X*L elements, corresponding to X OFDM symbol groups.

[0044] In some embodiments, the second category DMRS port includes one of a third category DMRS port where X is 2, a fourth category DMRS port where X is 3, or a third category DMRS port where X is 2 and a fourth category DMRS port where X is 3.

[0045] In some embodiments, the third category DMRS port and the third category DMRS port share the same DMRS port index.

[0046] In some embodiments, the categories of DMRS ports having the same DMRS port index are determined by the total number of DMRS OFDM symbol groups in one transmission opportunity for one channel, and may include a third category and a fourth category.

[0047] In some embodiments, the first indication or category of DMRS ports includes at least one of the number of DMRS OFDM symbol groups for DMRS ports with the same DMRS port index, an indication indicating whether the number of DMRS OFDM symbol groups for DMRS ports with the same DMRS port index is greater than one, or the TD-OCC length for DMRS ports with the same DMRS port index.

[0048] In some embodiments, a wireless communication node transmits first information to a wireless communication device to determine a first demodulation reference signal (DMRS) table. In some embodiments, the wireless communication node transmits a value of a field in signaling to the wireless communication device. In some embodiments, the value of the field is used by the wireless communication device to determine a first DMRS parameter according to the first DMRS table and the value of the field. In some embodiments, the first DMRS table includes a mapping between values ​​of the field of the signaling and values ​​of the first DMRS parameter, and each of the values ​​of the field is associated with a respective one of the values ​​of the first DMRS parameter. In some embodiments, the first DMRS table includes first DMRS parameters that are parameters for at least two categories of DMRS ports, where different categories of the at least two categories of DMRS ports correspond to at least one of: different numbers of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one time-domain orthogonal cover code (TD-OCC), different numbers of DMRS OFDM symbols of one TD-OCC, different numbers of DMRS OFDM symbols in one DMRS OFDM symbol group of one TD-OCC, or different relationships between vectors of one TD-OCC. In some embodiments, each of the DMRS OFDM symbol groups includes one or more consecutive OFDM symbols.

[0049] In some embodiments, a wireless communication device receives first information from a wireless communication node. In some embodiments, the wireless communication device determines that a second category DMRS port is enabled, and the TD-OCC of the second category DMRS port corresponds to X DMRS OFDM symbol groups. In some embodiments, X is an integer value greater than 1. In some embodiments, each of the DMRS OFDM symbol groups includes one or more consecutive OFDM symbols, and the OFDM symbols in different DMRS OFDM symbol groups are consecutive OFDM symbols. In some embodiments, the wireless communication device receives or transmits a channel according to the second category DMRS port.

[0050] In some embodiments, the wireless communication device comprises: [ka] Determine a sequence of DMRS ports of at least two categories according to: k=4*n+2*k'+Δ or k=6*n+k'+Δ, where k is a subcarrier index; [ka] where l'=0, 1, ..., L-1, where l is the OFDM symbol of DMRS port p, l' is the index of the OFDM symbol in one OFDM symbol group, L is the number of symbols in one OFDM symbol group, k'=0 or 1 is an intermediate parameter for determining the index of DMRS subcarrier k, n includes a non-negative integer value, and w f (k'), w t (l'), and Δ are the number of DMRS ports and w f (k'), w t (l'), and Δ, where w f (k') is FD-OCC, and w twhere (l') is the TD-OCC, Δ is the RE offset associated with the CDM group, μ is a parameter related to the subcarrier spacing, p is the number of DMRS ports, and for the second category DMRS ports, w t (l') contains X*L elements corresponding to X OFDM symbol groups, or for the second category DMRS ports, w t (l') contains X*L elements containing X different vectors, each of which contains L elements corresponding to one of the X OFDM symbol groups.

[0051] In some embodiments, the second category DMRS port includes one of a third category DMRS port where X is 2, a fourth category DMRS port where X is 3, or a third category DMRS port where X is 2 and a fourth category DMRS port where X is 3.

[0052] In some embodiments, the third category DMRS port and the fourth category DMRS port share the same DMRS port index.

[0053] In some embodiments, the categories of DMRS ports having the same DMRS port index are determined by the total number of DMRS OFDM symbol groups in one transmission opportunity of one channel, and the categories include a third category and a fourth category.

[0054] In some embodiments, for DMRS Type I and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is one, one CDM group includes a maximum of four DMRS ports, and there are two CDM groups with a maximum of eight DMRS ports. In some embodiments, for DMRS Type I and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is two, one CDM group includes a maximum of eight DMRS ports, and there are two CDM groups with a maximum of 16 DMRS ports. In some embodiments, for DMRS Type II and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is one, one CDM group includes a maximum of four DMRS ports, and there are three CDM groups with a maximum of 12 DMRS ports. In some embodiments, for DMRS Type II and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is two, one CDM group includes a maximum of eight DMRS ports, and there are three CDM groups with a maximum of 24 DMRS ports. In some embodiments, for DMRS Type I and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is 1, there are eight DMRS ports {0-3, 8-11}, CDM group 0 includes four DMRS ports {0, 1, 8, 9}, and CDM group 1 includes four DMRS ports {2, 3, 10, 11}. In some embodiments, for DMRS Type I and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is 2, there are sixteen DMRS ports {0-15}, CDM group 0 includes eight DMRS ports {0, 1, 8, 9, 4, 5, 12, 13}, and CDM group 1 includes eight DMRS ports {2, 3, 10, 11, 6, 7, 14, 15}. In some embodiments, for DMRS Type II and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is 1, there are twelve DMRS ports {0-5, 12-17}.CDM group 0 includes four DMRS ports {0, 1, 12, 13}, CDM group 1 includes four DMRS ports {2, 3, 14, 15}, and CDM group 3 includes four DMRS ports {4, 5, 16, 17}. In some embodiments, for DMRS Type II and when the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 2, there are 24 DMRS ports {0-23}, CDM group 0 includes eight DMRS ports {0, 1, 12, 13, 6, 7, 18, 19}, CDM group 1 includes eight DMRS ports {2, 3, 14, 15, 8, 9, 20, 21}, and CDM group 3 includes four DMRS ports {4, 5, 16, 17, 10, 11, 22, 23}.

[0055] In some embodiments, for DMRS Type I, X for DMRS ports {0-7} is 1 or 2. In some embodiments, for DMRS Type II, X for DMRS ports {0-11} is 1 or 2. In some embodiments, for DMRS Type I, X for DMRS ports {0-7} is 1 or 2. In some embodiments, for DMRS Type II, X for DMRS ports {0-11} is 1 or 2. In some embodiments, for DMRS Type I, X for DMRS ports {0-7} is determined by an instruction in signaling. In some embodiments, for DMRS Type II, X for DMRS ports {0-11} is determined by an instruction in signaling. In some embodiments, for DMRS Type I, X for DMRS ports {0-15} is 1, 2, or 3. In some embodiments, for DMRS Type I, X for DMRS ports {8-15} is determined by the total number of DMRS OFDM symbol groups for one transmission opportunity.

[0056] In some embodiments, the DMRS ports of the second category are included in a DMRS table that includes a mapping between values ​​of fields of the signaling and values ​​of the first DMRS parameters. In some embodiments, the DMRS table includes DMRS ports of one or more categories.

[0057] In some embodiments, a non-transitory computer-readable medium stores instructions that, when executed by at least one processor, cause the at least one processor to perform any of the methods disclosed herein.

[0058] In some embodiments, the apparatus includes at least one processor to perform any of the methods disclosed herein.

[0059] In one aspect, a wireless communication node may send, transmit, or provide first information to a wireless communication device. The first information may include a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, or a number of DMRS ports. According to the first information, the wireless communication device may determine a first DMRS table. In one aspect, the wireless communication node may send, transmit, or provide signaling to the wireless communication device. The signaling may be downlink control information (DCI) signaling, radio access control (RRC) signaling, or medium access control control element (MAC-CE) signaling. According to the value of a field in the first information, the wireless communication device may determine the first DMRS table and a first DMRS parameter according to the value of the field.

[0060] In some embodiments, the first DMRS table includes a mapping between values ​​of a field of the signaling and values ​​of the first DMRS parameter, with each value of the field being associated with a respective one of the values ​​of the first DMRS parameter. The first DMRS table includes first DMRS parameters that are parameters of at least two categories of DMRS ports. In some embodiments, different categories of the at least two categories of DMRS ports correspond to at least one of a different number of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one time-domain orthogonal cover code (TD-OCC), a different number of DMRS OFDM symbols of one TD-OCC, a different number of DMRS OFDM symbols within one DMRS OFDM symbol group of one TD-OCC, or a different relationship between vectors of one TD-OCC. Each DMRS OFDM symbol group may include one or more consecutive OFDM symbols.

[0061] In one aspect, indicating DMRS ports based on the DMRS table disclosed herein can support a larger number of DMRS ports. In one aspect, the DMRS table includes DMRS parameters for more than one category of DMRS ports with different numbers of DMRS OFDM symbol group TD-OCCs. Each DMRS OFDM symbol group may include one or more consecutive DMRS OFDM symbols. The DMRS OFDM symbols in different DMRS OFDM symbol groups are non-contiguous. By allowing the TD-OCC to accommodate more than one DMRS OFDM symbol group, the supported number of DMRS ports can be increased because new DMRS ports can be co-scheduled with old UEs and do not cause interference to the channel transmissions of the old UEs. In addition, one DMRS table may include more than one category of DMRS ports to increase scheduling flexibility. The gNB can dynamically switch between different category DMRS ports and schedule old and new UEs on demand. DMRS port indices can be shared with different category DMRS ports to reduce signaling overhead while supporting or enabling scheduling flexibility. Several parameters may be considered to obtain the DMRS ports of co-scheduled UEs. Thus, the UE can obtain more estimates of interference from co-scheduled UEs while allowing more DMRS ports. By allowing more DMRS ports, the wireless communication node can communicate with a larger number of wireless communication devices and enable more layers of MIMO transmission, thereby improving the spectral efficiency of the communications. The present invention provides, for example, the following. (Item 1) 1. A method, comprising: determining, by the wireless communication device, a first demodulation reference signal (DMRS) table according to first information from the wireless communication node; receiving, by the wireless communication device, a value of a field in signaling from the wireless communication node; determining, by the wireless communication device, a first DMRS parameter according to the first DMRS table and the value of the field; Including, the first DMRS table includes a mapping between values ​​of the field of the signaling and values ​​of the first DMRS parameters, each of the values ​​of the field being associated with a respective one of the values ​​of the first DMRS parameters; the first DMRS table includes the first DMRS parameters of at least two categories of DMRS ports, and different categories of the at least two categories of DMRS ports correspond to at least one of different numbers of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one Time Domain Orthogonal Cover Code (TD-OCC), different numbers of DMRS OFDM symbols of one TD-OCC, different numbers of DMRS OFDM symbols in one DMRS OFDM symbol group of one TD-OCC, or different relationships between vectors of one TD-OCC; The method, wherein each of the DMRS OFDM symbol groups includes one or more consecutive OFDM symbols. (Item 2) There is a gap between the symbols of two adjacent DMRS OFDM symbol groups, said gap being greater than zero OFDM symbols; or The OFDM symbols in different DMRS OFDM symbol groups are non-contiguous with respect to each other. Item 1. The method according to item 1, wherein the method is at least one of the following: (Item 3) the at least two categories of DMRS ports include a first category of DMRS ports and a second category of DMRS ports; The TD-OCC of the first category DMRS port corresponds to one DMRS OFDM symbol group, and the second category DMRS port corresponds to X DMRS OFDM symbol groups, where X is an integer value greater than 1; The method according to item 1. (Item 4) Item 1. The method of item 1, wherein, when the wireless communication device is configured with DMRS Type I and the maximum number of OFDM symbols in one OFDM symbol group is 1, the wireless communication device determines Y DMRS ports selected from DMRS ports {0 to 3, 8, 9, 10, 11} according to the value of the first DMRS parameter, where Y is a positive integer value. (Item 5) Item 1. The method of item 1, wherein, when the wireless communication device is configured with DMRS Type II and the maximum number of OFDM symbols in one OFDM symbol group is 1, the wireless communication device determines Y DMRS ports selected from DMRS ports {0 to 5, 12 to 17} according to the value of the first DMRS parameter, where Y is a positive integer. (Item 6) Item 1. The method of item 1, wherein, when the wireless communication device is configured with DMRS Type I and the maximum number of OFDM symbols in one OFDM symbol group is 2, the wireless communication device determines Y DMRS ports selected from DMRS ports {0 to 15} according to the value of the first DMRS parameter, where Y is a positive integer. (Item 7) Item 1. The method of item 1, wherein, when the wireless communication device is configured with DMRS Type II and the maximum number of OFDM symbols in one OFDM symbol group is 2, the wireless communication device determines Y DMRS ports selected from DMRS ports {0 to 23} according to the value of the first DMRS parameter, where Y is a positive integer. (Item 8) Item 4 or 6. The method according to item 4 or 6, wherein, when the Y DMRS ports include at least one of DMRS ports 8 to 15, and the number of CDM groups with no data is a first maximum value, the first DMRS parameter includes the number of CDM groups with no data and the Y DMRS ports. (Item 9) Item 6. The method according to item 6, wherein, when the Y DMRS ports include at least one of DMRS ports 8 to 15, and the number of DMRS OFDM symbols in one DMRS OFDM symbol group is a second maximum value, the first DMRS parameters include the number of DMRS OFDM symbols in one DMRS OFDM symbol group and the Y DMRS ports. (Item 10) DMRS Ports 0-7 are first category DMRS ports and DMRS Ports 8-15 are second category DMRS ports; or DMRS ports 0 to 7 are first category DMRS ports and second category DMRS ports, and DMRS ports 8 to 15 are second category DMRS ports, and the first category DMRS ports of DMRS ports 0 to 7 and the second category DMRS ports of DMRS ports 0 to 7 have the same DMRS port index of 0 to 7. The method according to item 4, 6, 8, or 9. (Item 11) The method of item 5 or 7, wherein when the Y DMRS ports include at least one of DMRS ports 12 to 23 and the number of CDM groups with no data is a first maximum value, the first DMRS parameter includes the number of CDM groups with no data and the Y DMRS ports. (Item 12) Item 7. The method according to item 7, wherein the Y DMRS ports include at least one of DMRS ports 12 to 23, and when the number of DMRS OFDM symbols in one DMRS OFDM symbol group is a second maximum value, the first DMRS parameters include the number of DMRS OFDM symbols in one DMRS OFDM symbol group and the Y DMRS ports. (Item 13) DMRS Ports 0-11 are first category DMRS ports and DMRS Ports 12-23 are second category DMRS ports; or DMRS ports 0 to 11 are first category DMRS ports and second category DMRS ports, and DMRS ports 8 to 15 are second category DMRS ports, and the first category DMRS ports and second category DMRS ports of the DMRS ports 0 to 11 have the same DMRS port index of 0 to 11. 13. The method according to any one of items 5, 7, 11, or 12. (Item 14) the first DMRS parameters include Y DMRS ports and a number of CDM groups with no data; The number of CDM groups with no data is determined according to at least one of the categories of the Y DMRS ports or the relationship between elements of one TD-OCC; or The value of the first DMRS parameter of the first DMRS table does not include the first value of the number of CDM groups with no data and the DMRS port of the second category. Item 1. The method according to item 1, wherein the method is at least one of the following: (Item 15) the number of CDM groups without data is further determined according to at least one index of a CDM group including the Y DMRS ports; or The value of the first DMRS parameter of the first DMRS table does not include the first value of the number of CDM groups with no data and the DMRS ports of the second category. Item 15. The method according to item 14, wherein the method is at least one of the following: (Item 16) Item 15. The method of item 14, wherein if the Y DMRS ports include at least one DMRS port of a second category, the number of CDM groups with no data is a first maximum value. (Item 17) the first DMRS table includes the first DMRS parameters of the at least two categories of DMRS ports; the first DMRS parameter includes Y DMRS ports, and the Y DMRS ports associated with one value of the field belong to one of the at least two categories; the first DMRS parameter includes Y DMRS ports, and the Y DMRS ports associated with one value of the field belong to more than one of the at least two categories; or The first DMRS parameter includes Y DMRS ports, and the DMRS ports of the at least two categories are associated with different values ​​of the field. Item 1. The method according to item 1, wherein at least one of the following is satisfied: (Item 18) the Y DMRS ports associated with one value of the field belong to more than one of the at least two categories of DMRS ports; more than one of the at least two categories of DMRS ports are in different CDM groups; DMRS ports in one CDM group and from the above Y DMRS ports belong to one category of DMRS ports; the Y DMRS ports belong to one category of DMRS ports for one channel and one part of the signaling, and belong to different categories of DMRS ports for different channels and different parts of the signaling; The Y DMRS ports belong to one category of DMRS ports for one channel and one part of signaling, and the Y DMRS ports of the category of the one channel depend on a first indication; or The Y DMRS ports belong to one category of DMRS ports for one channel and one part of signaling, and the number of the Y DMRS ports in one category depends on the total number of DMRS OFDM symbol groups in one transmission opportunity of one channel. Item 18. The method according to item 17, wherein at least one of the following is satisfied: (Item 19) the first DMRS parameters include a number of consecutive orthogonal frequency division multiplexing (OFDM) symbols in an OFDM symbol group and Y DMRS ports; the number of consecutive OFDM symbols in the OFDM symbol group is determined by categories of the Y DMRS ports. the number of consecutive OFDM symbols in the one OFDM symbol group is one of 1, 2, or 4; or The value of the first parameter of the first DMRS table does not include a first value of the number of consecutive OFDM symbols in one OFDM symbol group and a DMRS port of a second category. Item 1. The method according to item 1, wherein the method is at least one of the following: (Item 20) Item 19. The method of item 19, wherein if the Y DMRS ports include a DMRS port of a second category, the number of CDM groups without data is a first maximum value, and the number of consecutive OFDM symbols in one OFDM symbol group is a second maximum value. (Item 21) The first maximum value is 2 for a Type I DMRS port. The first maximum value is 3 for a Type II DMRS port, or The second maximum value is 2 or 4. 21. The method of any one of items 8, 9, 11, 12, 16, or 20, wherein the method is at least one of: (Item 22) the first DMRS parameters include the number of consecutive orthogonal frequency division multiplexing (OFDM) symbols in an OFDM symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in the OFDM symbol group; If the Y DMRS ports include second category DMRS ports corresponding to the same element of the TD-OCC across multiple DMRS OFDM symbols in one DMRS OFDM symbol group, but do not include DMRS ports in CDM group 1, the number of CDM groups with no data is 1 or 2, and the number of consecutive OFDM symbols in the one OFDM symbol group is 1 or 2. 21. The method of any one of items 1, 14, or 20. (Item 23) the first DMRS parameters include the number of consecutive orthogonal frequency division multiplexing (OFDM) symbols in an OFDM symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in the OFDM symbol group; For the same combination of Y DMRS ports, including a second DMRS port in CDM group 0 and no DMRS port in CDM group 1, there are four values ​​in the first DMRS table, each corresponding to one of four combinations in which the number of CDM groups with no data is 1 or 2 and the number of consecutive OFDM symbols in the one OFDM symbol group is 1 or 2; The DMRS ports of the second category correspond to the same element of the TD-OCC across multiple DMRS OFDM symbols of one DMRS OFDM symbol group. 21. The method of any one of items 1, 14, or 20. (Item 24) the first DMRS parameters include the number of consecutive orthogonal frequency division multiplexing (OFDM) symbols in an OFDM symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in the OFDM symbol group; For the same combination of Y DMRS ports, including a second DMRS port in CDM group 0 and no DMRS port in CDM group 1, there are two values ​​in the first DMRS table, each corresponding to one of two combinations where the number of CDM groups with no data is 1 or 2 and the number of consecutive OFDM symbols in the one OFDM symbol group is 2; The DMRS ports of the second category correspond to the same element of the TD-OCC across multiple OFDM symbols of one DMRS OFDM symbol group. 21. The method of any one of items 1, 14, or 20. (Item 25) 25. The method of any one of items 1 to 24, wherein the signaling includes one of Downlink Control Information (DCI) signaling, Radio Access Control (RRC) signaling, or Medium Access Control Control Element (MAC-CE) signaling. (Item 26) the first DMRS parameters include a number of data-free code division multiplexing (CDM) groups and Y DMRS ports; If the maximum number of OFDM symbols in one DMRS OFDM symbol group is greater than 1, the first DMRS parameter further includes the number of consecutive OFDM symbols in one OFDM symbol group; 26. The method according to any one of items 1 to 25. (Item 27) If the Y DMRS ports are DMRS ports of a physical downlink shared channel (PDSCH), the first DMRS parameter is: DMRS port category, DMRS port category in a CDM group with no data, relationship between DMRS port categories in different CDM groups with no data, TD-OCC length of the above DMRS port in a CDM group with no data, TD-OCC length of the DMRS port, or TD-OCC length of the DMRS port per CDM group with no data and a third parameter including at least one of: the DMRS port or the plurality of DMRS ports is from the Y DMRS ports of a channel of the wireless communication device, and / or the DMRS port or the plurality of DMRS ports includes a DMRS port of a potentially co-scheduled wireless communication device of the wireless communication device; Item 27. The method according to item 26. (Item 28) the number of bits in the field is determined by the first DMRS information; or The first DMRS table is selected from a plurality of tables according to the first information. Item 1. The method according to item 1, wherein the method is at least one of the following: (Item 29) the first information includes at least one of a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, or the number of the DMRS ports; Different DMRS types correspond to different frequency domain patterns of the DMRS ports. 29. The method according to item 1 or 28. (Item 30) The second DMRS parameter is for indicating whether a second category DMRS port is enabled; The second DMRS parameter is for indicating whether the DMRS port includes a valid second category DMRS port; The second DMRS parameter is a 1-bit parameter. the second DMRS parameter is included in third signaling, including at least one of DCI signaling, MAC-CE signaling, or RRC signaling; or If the first DMRS table includes DMRS ports of a physical uplink shared channel (PUSCH), and the first information is used to select the first DMRS table but is not used to determine the number of bits in the field, the first information includes the number of the DMRS ports. 30. The method according to item 29, comprising at least one of the following: (Item 31) The first DMRS parameters include Y DMRS ports, and the method includes: determining, by the wireless communication device, at least one of DMRS port categories of the Y DMRS ports or TD-OCC lengths of DMRS ports of simultaneously scheduled wireless communication devices in different code division multiplexing (CDM) groups according to a total number of OFDM symbol groups included in one transmission opportunity; Item 1. The method of item 1, further comprising: (Item 32) determining, by the first wireless communication device, at least one of the categories of the DMRS ports of the Y DMRS ports or the lengths of the TD-OCCs of the DMRS ports of the simultaneously scheduled wireless communication devices in the different CDM groups according to the total number of OFDM symbol groups and the Y DMRS ports included in the one transmission opportunity; Item 32. The method according to Item 31, comprising: (Item 33) 33. The method according to any one of items 4 to 32, wherein Y is less than 5 or 9. (Item 34) The DMRS ports of the at least two categories are indexed together. the index of the DMRS ports is determined by first indexing across the DMRS ports of a first category and then indexing across the DMRS ports of a second category; or The first category DMRS port and some second category DMRS ports share the same DMRS port index. Item 1. The method according to item 1, wherein the method is at least one of the following: (Item 35) the first DMRS port with the first TD-OCC and the second DMRS port with the second TD-OCC share the same DMRS port index; If the first DMRS table is for a physical uplink shared channel (PUSCH), a first DMRS port having a first TD-OCC and a second DMRS port having a second TD-OCC share the same DMRS port index. if the first DMRS table is for a physical uplink shared channel (PUSCH), a first DMRS port having a first TD-OCC and a second DMRS port having a second TD-OCC share the same DMRS port index, and there is no indication from the wireless communication node to indicate the TD-OCC of the DMRS port having the same DMRS port index; If the first table is for a physical downlink shared channel (PDSCH), a first DMRS port having a first TD-OCC and a second DMRS port having a second TD-OCC have different DMRS port indexes. if a first DMRS port having a first TD-OCC and a second DMRS port having a second TD-OCC share the same DMRS port index and the first table is for a physical downlink shared channel (PDSCH), the wireless communications device determines the TD-OCC of the DMRS port having the same DMRS port index; or If a first DMRS port having a first TD-OCC and a second DMRS port having a second TD-OCC share the same DMRS port index and the first table is for a physical downlink shared channel (PDSCH), the wireless communications device determines the TD-OCC of the DMRS ports having the same DMRS port index according to at least one of a parameter included in the first DMRS parameter or a total number of DMRS OFDM symbol groups of one transmission opportunity of one channel. 35. The method according to item 1 or 34, wherein the method is at least one of: (Item 36) the second TD-OCC comprises more than one repeat of the first TD-OCC; the length of the first TD-OCC is a factor of the length of the second TD-OCC; or The number of DMRS OFDM symbol groups of the first TD-OCC is 3, and the number of DMRS OFDM symbol groups of the first TD-OCC is 4. Item 36. The method according to item 35, wherein the method is at least one of the following: (Item 37) The parameters included in the first DMRS parameters are: the number of DMRS OFDM symbol groups of the DMRS ports having the same DMRS port index; an indication of whether the number of DMRS OFDM symbol groups of the DMRS ports having the same DMRS port index is greater than one; or The length of the TD-OCC of the DMRS port having the same DMRS port index Item 36. The method according to item 35, comprising at least one of the following: (Item 38) the at least two categories of DMRS ports include the first category of DMRS ports and the second category of DMRS ports; The TD-OCC of the first category DMRS port corresponds to one OFDM symbol group, and the second category DMRS port corresponds to X OFDM symbol groups, where X is an integer value greater than 1. If the first category DMRS ports correspond to X OFDM symbol groups and the second category DMRS ports correspond to different TD-OCCs across the X OFDM symbol groups, then the first category DMRS ports correspond to the same TD-OCC across the X OFDM symbol groups; or The length of the TD-OCC of the first category DMRS port is L, and the length of the TD-OCC of the second category DMRS port is X*L, where L is the number of OFDM symbols in one OFDM symbol group. 38. The method according to any one of items 10 to 37, wherein the method is at least one of the following: (Item 39) The wireless communication device

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[0062] Various exemplary embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for illustrative purposes only and merely depict exemplary embodiments of the present solution to facilitate the reader's understanding of the present solution. Therefore, the drawings should not be considered as limiting the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, the drawings are not necessarily drawn to scale.

[0063] [Figure 1] FIG. 1 illustrates an exemplary cellular communication network in which the techniques disclosed herein may be implemented, according to one embodiment of the present disclosure.

[0064] [Figure 2] FIG. 2 illustrates a block diagram of an exemplary base station and user equipment device in accordance with some embodiments of the present disclosure.

[0065] [Figure 3] FIG. 3 illustrates two code division multiplexing (CDM) groups for demodulation reference signal (DMRS) Type I, in accordance with some embodiments of the present disclosure, where one TD-OCC corresponds to two DMRS OFDM groups, each containing one DMRS OFDM symbol.

[0066] [Figure 4] FIG. 4 illustrates three CDM groups for DMRS Type II, with one TD-OCC corresponding to two DMRS OFDM groups, each containing one DMRS OFDM symbol, in accordance with some embodiments of the present disclosure.

[0067] [Figure 5] FIG. 5 illustrates a flow diagram of an example method for communicating according to DMRS port indications based on a DMRS table, in accordance with one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0068] Detailed Description 1. Mobile communication technology and environment 1 illustrates an exemplary wireless communication network and / or system 100 in which the techniques disclosed herein may be implemented, according to one embodiment of the present disclosure. In the following description, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of Things (NB-IoT) network, and is referred to herein as “network 100.” Such exemplary network 100 includes a base station 102 (hereinafter “BS 102,” also referred to as a wireless communication node) and a user equipment device 104 (hereinafter “UE 104,” also referred to as a wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel), and a cluster of cells 126, 130, 132, 134, 136, 138, and 140 that overlap a geographic region 101. In FIG. 1, the BS 102 and the UE 104 are contained within the respective geographic boundaries of the cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating in its assigned bandwidth to provide adequate radio coverage to its intended users.

[0069] For example, the BS 102 may operate in an assigned channel transmission bandwidth to provide adequate effective coverage to the UE 104. The BS 102 and the UE 104 may communicate via downlink radio frames 118 and uplink radio frames 124, respectively. Each radio frame 118 / 124 may be further divided into subframes 120 / 127, which may include data symbols 122 / 128. In this disclosure, the BS 102 and the UE 104 are generally described herein as non-limiting examples of “communication nodes” capable of practicing the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communication in accordance with various embodiments of the present solution.

[0070] 2 illustrates a block diagram of an exemplary wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. System 200 may include components and elements configured to support known or conventional operational features not necessarily described in detail herein. In one exemplary embodiment, system 200 may be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment, such as wireless communication environment 100 of FIG. 1 described above.

[0071] The system 200 generally includes a base station 202 (hereinafter “BS 202”) and a user equipment device 204 (hereinafter “UE 204”). The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each of which is coupled and interconnected as needed via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each of which is coupled and interconnected as needed via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication link 250, which may be any wireless channel or other medium suitable for the transmission of data as described herein.

[0072] As will be appreciated by those skilled in the art, system 200 may further include any number of modules other than those illustrated in FIG. 2 . Those skilled in the art will appreciate that the various exemplary blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this compatibility and suitability of hardware, firmware, and software, the various exemplary components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software may depend on the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a manner suitable for each particular application, but such implementation decisions should not be construed as limiting the scope of the present disclosure.

[0073] According to some embodiments, the UE transceiver 230 may be referred to herein as an “uplink” transceiver 230 including a radio frequency (RF) transmitter and an RF receiver, each with circuitry coupled to an antenna 232. A duplexing switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in a time-duplexed manner. Similarly, according to some embodiments, the BS transceiver 210 may be referred to herein as a “downlink” transceiver 210 including an RF transmitter and an RF receiver, each with circuitry coupled to an antenna 212. A downlink duplexing switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in a time-duplexed manner. The operation of the two transceiver modules 210 and 230 may be time-coordinated such that the downlink transmitter is coupled to the downlink antenna 212 at the same time that the uplink receiver circuitry is coupled to the uplink antenna 232 for receiving transmissions over the wireless transmission link 250. Conversely, the operation of the two transceivers 210 and 230 may be time-coordinated such that the uplink transmitter is coupled to the uplink antenna 232 at the same time that the downlink receiver is coupled to the downlink antenna 212 to receive transmissions over the wireless transmission link 250. In some embodiments, there is close time synchronization with a minimum guard time between changes in duplex direction.

[0074] The UE transceiver 230 and the base station transceiver 210 are configured to communicate over a wireless data communication link 250 and cooperate with a suitably configured RF antenna array 212 / 232 capable of supporting a particular wireless communication protocol and modulation scheme. In some exemplary embodiments, the UE transceiver 230 and the base station transceiver 210 are configured to support industry standards such as Long Term Evolution (LTE) and emerging 5G standards. However, it will be understood that the present disclosure is not necessarily limited to application to a particular standard and associated protocol. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternative or additional wireless data communication protocols, including future standards or variants thereof.

[0075] According to various embodiments, the BS 202 may be, for example, an enhanced Node B (eNB), a serving eNB, a target eNB, a femto station, or a pico station. In some embodiments, the UE 204 may be embodied in various types of user devices, such as a mobile phone, a smartphone, a personal digital assistant (PDA), a tablet, a laptop computer, a wearable computing device, etc. The processor modules 214 and 236 may be implemented or realized using a general-purpose processor, a content-addressable memory, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. As such, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, etc. A processor may also be implemented as a combination of computing devices, such as a combination of a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.

[0076] Moreover, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, firmware, a software module executed by processor modules 214 and 236, respectively, or any practical combination thereof. Memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to processor modules 214 and 236, respectively, such that processor modules 214 and 236 can read information from and write information to memory modules 216 and 234, respectively. Memory modules 216 and 234 may also be integrated into their respective processor modules 214 and 236. In some embodiments, memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions executed by processor modules 214 and 236, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions executed by processor modules 214 and 236, respectively.

[0077] The network communications module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bidirectional communications between the base station transceiver 210 and other network components and communications nodes configured to communicate with the base station 202. For example, the network communications module 218 may be configured to support Internet or WiMAX traffic. In a typical deployment, without limitation, the network communications module 218 provides an 802.3 Ethernet interface to enable the base station transceiver 210 to communicate with conventional Ethernet-based computer networks. As such, the network communications module 218 may include a physical interface for connecting to a computer network (e.g., a mobile switching center (MSC)). As used herein with respect to a specified operation or function, the terms “configured for,” “configured to,” and conjugations thereof refer to a device, component, circuit, structure, machine, signal, etc. that is physically constructed, programmed, formatted, and / or arranged to perform the specified operation or function.

[0078] The Open Systems Interconnection (OSI) model (referred to herein as the "Open Systems Interconnection Model") is a conceptual and logical layout that defines network communications used by systems (e.g., wireless communication devices, wireless communication nodes) that are open to interconnection and communication with other systems. The model is divided into seven subcomponents or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI model also defines logical networks and effectively describes computer packet transfers by using different layer protocols. The OSI model is sometimes referred to as the seven-layer OSI model or seven-layer model. In some embodiments, the first layer may be the physical layer. In some embodiments, the second layer may be the medium access control (MAC) layer. In some embodiments, the third layer may be the radio link control (RLC) layer. In some embodiments, the fourth layer may be the packet data convergence protocol (PDCP) layer. In some embodiments, the fifth layer may be the radio resource control (RRC) layer. In some embodiments, the sixth layer may be a non-access stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer is another layer.

[0079] To enable those skilled in the art to make and use the present solution, various exemplary embodiments of the present solution are described below with reference to the accompanying figures. As will be apparent to those skilled in the art, after understanding the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, any specific order or hierarchy of steps in the methods disclosed herein is merely an example approach. Based on design preferences, the specific order or hierarchy of steps in a disclosed method or process can be rearranged while remaining within the scope of the present solution. Thus, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or operations in a sample order, and that the present solution is not limited to the specific order or hierarchy presented, unless otherwise specified. 2. Systems and methods for directing and / or determining DMRS ports

[0080] More orthogonal DMRS ports can enable MIMO transmission of more layers. Increasing the spectral efficiency of communication is important. How to increase more orthogonal DMRS ports is a problem solved by the following method. In a particular system (e.g., 5G New Radio (NR), Next Generation (NG) system, 3GPP system, and / or other systems), a wireless communication device (e.g., UE) and a wireless communication node (e.g., base station) can communicate with each other according to DMRS parameters. In one aspect, the wireless communication node can send, transmit, or provide first information to the wireless communication device. The first information may include a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, or the number of DMRS ports. According to the first information, the wireless communication device can determine a first DMRS table. In one aspect, the wireless communication node can send, transmit, or provide signaling to the wireless communication device. The signaling may be downlink control information (DCI) signaling, radio access control (RRC) signaling, or medium access control control element (MAC-CE) signaling. According to a value of a field in the first information, the wireless communication device can determine a first DMRS parameter according to the first DMRS table and the value of the field. The wireless communication device can receive a channel or transmit a channel according to the determined first DMRS parameter.

[0081] In some embodiments, the first DMRS table includes a mapping between values ​​of a field of the signaling and values ​​of the first DMRS parameter, with each value of the field being associated with a respective one of the values ​​of the first DMRS parameter. The first DMRS table includes first DMRS parameters that are parameters of at least two categories of DMRS ports. In some embodiments, different categories of the at least two categories of DMRS ports correspond to at least one of a different number of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one time-domain orthogonal cover code (TD-OCC), a different number of DMRS OFDM symbols of one TD-OCC, a different number of DMRS OFDM symbols within one DMRS OFDM symbol group of one TD-OCC, or a different relationship between vectors of one TD-OCC. Each DMRS OFDM symbol group may include one or more consecutive OFDM symbols. The relationship between vectors of one TD-OCC may include one TD-OCC including repeated vectors.

[0082] In one aspect, indicating DMRS ports based on the DMRS table disclosed herein can support a larger number of DMRS ports. In one aspect, the DMRS table includes DMRS parameters for more than one category of DMRS ports with different numbers of DMRS OFDM symbol group TD-OCCs. Each DMRS OFDM symbol group may include one or more consecutive DMRS OFDM symbols. The DMRS OFDM symbols in different DMRS OFDM symbol groups are non-contiguous. By allowing the TD-OCC to accommodate more than one DMRS OFDM symbol group, the supported number of DMRS ports can be increased because new DMRS ports can be co-scheduled with old UEs and do not cause interference to the channel transmissions of the old UEs. In addition, one DMRS table may include more than one category of DMRS ports to increase scheduling flexibility. The gNB can dynamically switch between different category DMRS ports and schedule old and new UEs on demand. DMRS port indices can be shared with different category DMRS ports to reduce signaling overhead while supporting or enabling scheduling flexibility. Several parameters may be considered to obtain the DMRS ports of co-scheduled UEs. Thus, the UE can obtain more estimates of interference from co-scheduled UEs while allowing more DMRS ports. By allowing more DMRS ports, the wireless communication node can communicate with a larger number of wireless communication devices and enable more layers of MIMO transmission, thereby improving the spectral efficiency of the communications.

[0083] 3 illustrates two code division multiplexing (CDM) groups for demodulation reference signal (DMRS) Type I, where one TD-OCC corresponds to two DMRS OFDM groups each containing one DMRS OFDM symbol, in accordance with some embodiments of the present disclosure. FIG. 4 illustrates three CDM groups for DMRS Type II, where one TD-OCC corresponds to two DMRS OFDM groups each containing one DMRS OFDM symbol, in accordance with some embodiments of the present disclosure. Example 1

[0084] For DMRS of the Physical Uplink Shared Channel (PUSCH), one DMRS table may include DMRS ports of multiple categories. The DMRS ports of multiple categories may correspond to different numbers of OFDM (symbol) groups within one TD-OCC. Each OFDM group (or group of OFDM symbols) may include one or more consecutive OFDM symbols. For example, one OFDM group includes one OFDM symbol or two consecutive OFDM symbols. Different OFDM groups may include non-consecutive OFDM symbols. For example, the gap between two DMRS OFDM symbol groups may be greater than zero.

[0085] The DMRS table may include a mapping between values ​​of the DMRS bit field in the DCI and the first DMRS parameter.

[0086] For example, one DMRS table includes a first-category DMRS port corresponding to one OFDM group in one TD-OCC (e.g., the number of OFDM groups=1). If one OFDM group includes one OFDM symbol, the first-category DMRS port may correspond to a TD-OCC of length 1. If one OFDM group includes two consecutive OFDM symbols, the first-category DMRS port may correspond to a TD-OCC of length 2. One DMRS table may also include second-category DMRS ports corresponding to X OFDM groups, where X is greater than 1. For example, the second-category DMRS port may include a third-category DMRS port where X=2. If one DMRS OFDM symbol group includes one OFDM symbol and X=2, one third-category DMRS port may correspond to a TD-OCC of length 2. If one OFDM group includes two OFDM symbols and X=2, one third category DMRS port may correspond to a TD-OCC of length 4. For example, the length of the TD-OCC may be equal to the number of OFDM symbols in the X OFDM groups. In some implementations, all of the DMRS OFDM symbol groups may include the same number of OFDM symbols, and the length of the TD-OCC may be equal to the number of OFDM symbols in one DMRS symbol group multiplied by X. In some implementations, the number of OFDM symbols in different DMRS symbol groups may be different.

[0087] As shown in FIG. 3, each DMRS OFDM symbol group may include one OFDM symbol. For a first category DMRS port, the TD-OCC may have length 1. OFDM symbol n0 and OFDM symbol n1 may each / respectively correspond to one TD-OCC of length 1. In one aspect, a TD-OCC of length 1 can be labeled, named, or identified without TD-OCC encoding, so in this case, there is no TD-OCC for the first category DMRS port. For a third category DMRS port and X=2, the TD-OCC may have length 2. One TD-OCC of length 2 may correspond to two DMRS OFDM symbol groups including OFDM symbol n0 and OFDM symbol n1.

[0088] If the UE is indicated with a third category DMRS port, the number of CDM groups without data may be two for DMRS Type I and three for DMRS Type II. DMRS Type I and DMRS Type II may be used to indicate the frequency domain pattern of the DMRS port. In one aspect, Figure 3 corresponds to DMRS Type I and Figure 4 corresponds to DMRS Type II.

[0089] For a first category DMRS port whose TD-OCC length is 1, the UE may obtain the sequence of the DMRS port according to the following equation (1): [ka] where w f (k'), w t (l'), and Δ are given by Table 1. k is the subcarrier index. The reference point for k is subcarrier 0 in common resource block 0. l is the OFDM symbol of the DMRS. [ka] is the first symbol of each of the L consecutive OFDM symbols. For example, [ka] may be the first symbol of each DMRS OFDM symbol group. [ka] is the upper layer configuration of l0, mapping type, and PUSCH duration l as shown in Tables 2 and 3. d Table 2 applies when the maximum number of OFDM symbols in one DMRS OFDM symbol group is equal to 1. Table 3 applies when the maximum number of OFDM symbols in one DMRS OFDM symbol group is equal to 2. l0 is the first DM-RS symbol of the DMRS and the first symbol of the first DMRS OFDM symbol group. r(m) is the bit with index m in the bit sequence generated by the pseudo-random sequence generation function. v is the number of layers and the number of DMRS ports. p includes the DMRS ports indicated by the DCI, based on the order indicated in the DCI. μ is a parameter related to the subcarrier spacing, for example, the subcarrier spacing of the DMRS is 2. μ *15kHz.

[0090] The reference point for l and the position l0 of the first DM-RS symbol may depend on the mapping type. For PUSCH mapping type A, l may be defined or determined relative to the start of the slot if frequency hopping is disabled, or relative to the start of each hop if frequency hopping is enabled, with l0 being given by the higher layer parameter dmrs-TypeA-Position. For PUSCH mapping type B, l may be defined relative to the start of the scheduled PUSCH resource if frequency hopping is disabled, or relative to the start of each hop if frequency hopping is enabled, with l0=0.

[0091] In one aspect, the location of the DM-RS symbols is: [ka] and duration l d For example, l d is the duration between the first and last OFDM symbols of a slot of scheduled PUSCH resources in a slot for PUSCH mapping type A according to Tables 2 and 3 if intra-slot frequency hopping is not used. For example, d is the duration of the scheduled PUSCH resource for PUSCH mapping type B according to Tables 2 and 3 if intra-slot frequency hopping is not used. For example, d is the duration per hop according to Table 4 if intra-slot frequency hopping is used. [Table 1] [Table 2] [Table 3] [Table 4]

[0092] OFDM position in the time domain [ka] may be based on one of Table 2, Table 3, or Table 4. Table 2 may be appropriate when the number of OFDM symbols in one DMRS OFDM symbol group is equal to 1 and intra-slot frequency hopping is disabled. Table 3 may be appropriate when the number of OFDM symbols in one DMRS OFDM symbol group is equal to 2 and intra-slot frequency hopping is disabled. Table 4 may be appropriate when the number of OFDM symbols in one DMRS OFDM symbol group is equal to 1 and intra-slot frequency hopping is enabled.

[0093] For the third category of DMRS ports, the UE may assume a sequence of DMRS ports according to equation (2) below. [ka] where w f (k'), w t (l'), and Δ are given by Table 5. l is based on Table 2. [ka] is the first division of one TD-OCC with length Z equal to the number of X*OFDM symbols in one DMRS OFDM symbol group. [ka] and the second [ka] For example, [ka] If is determined to be {l0,7} according to Table 2, then [ka] is n0 in Figures 3 and 4. [ka] Corresponds to. [ka] corresponds to 7, such as n1 in Figures 3 and 4. [ka] corresponds to the first DMRS OFDM symbol group l′ of one TD-OCC. [ka] corresponds to the first symbol of the second DMRS OFDM symbol group of one TD-OCC. [ka] corresponds to the first DMRS OFDM symbol group of one TD-OCC. [ka] corresponds to the second DMRS OFDM symbol group of one TD-OCC. [ka] is determined to be {l0, 5, 8, 11} according to Table 2. Four DMRS OFDM groups correspond to two TD-OCCs of length 2. OFDM symbol {l0, 5} corresponds to one TD-OCC, and OFDM symbol {8, 11} corresponds to another TD-OCC. For the TD-OCC of OFDM symbol {l0, 5}, [ka] refer to l0 and 5, respectively. For TD-OCC with OFDM symbols {8, 11}, [ka] refers to 8 and 11, respectively. In equation (2), [ka] is the first of one TD-OCC [ka] In the DMRS OFDM symbol group, l'=0,1. [ka] is the first of one TD-OCC [ka] In the DMRS OFDM symbol group, l'=0,1. [Table 5]

[0094] The first category DMRS ports and the third category DMRS ports can be combined into one Table 6. They both comply with Table 6 and Equation (1) or Equation (2).

[0095] The first category of DMRS ports 0 to 7 are: [ka] Same across w t (l'), and the third category DMRS ports 8 to 15 are [ka] Different w t Corresponding to (l'). [Table 6]

[0096] In one embodiment, in Table 6, w t(l') is the same across the first DMRS OFDM symbol group and the second DMRS OFDM symbol group of one TD-OCC for DMRS ports 0 through 7. The TD-OCC length for DMRS ports 0 through 7 may be 2 or 4. The TD-OCC length to use for DMRS ports 0 through 7 may be up to the gNB and may depend on the total number of layers assigned to one UE or multiple simultaneously scheduled UEs when the gNB obtains channel estimates based on DMRS ports 0 through 7. If the gNB assigns at least one DMRS port from 0 through 7 and at least one DMRS port from 8 through 15 in the same CDM group to one UE or multiple UEs on the same PRB (physical resource block), the gNB can obtain a channel based on at least one DMRS port from 0 through 7 using a TD-OCC length of 4. If a gNB allocates only at least one of the DMRS ports from 0 to 7 to one UE or multiple UEs on the same PRB (Physical Resource Block) but not a DMRS port from 8 to 15 in the same CDM group, the gNB can use TD-OCC length 2 to acquire a channel based on at least one of the DMRS ports from 0 to 7.

[0097] In some embodiments, each CDM group comprises two FDM-OCCw f There may be two CDM groups, each containing two orthogonal DMRS ports multiplexed by (k'). There may be two CDM groups. t (l') may have four orthogonal DMRS ports. The 16 orthogonal DMRS ports for the third category of DMRS ports are four w t(l') Orthogonal TD-OCCs may be provided, but DMRS ports 8 through 15 may be determined, utilized, or assigned to be third category DMRS ports. DMRS numbers 0 through 7 may be shared between first category DMRS ports and third category DMRS ports. The TD-OCC length for DMRS ports 0 through 7 may be assumed to be 4 or 2. Which TD-OCC length is used by the gNB to acquire channels based on DMRS ports 0 through 7 may be determined by the gNB. For example, if UE1 is assigned DMRS port {0, 1} and there are fewer than seven co-scheduled UEs of UE1, the gNB may acquire or be assigned channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 2. If UE1 is assigned DMRS port {0, 1} and there are seven or more co-scheduled UEs of UE1, the gNB may acquire or be assigned to channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 4. For example, if UE1 is assigned DMRS port {0, 1} and there are fewer than four co-scheduled UEs in the same CDM group, the gNB may acquire or be assigned to channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 2. If UE1 is assigned DMRS port {0, 1} and there are more than four co-scheduled UEs in the same CDM group, the gNB may acquire or be assigned to channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 4.

[0098] For DMRS Type II, the UE may obtain the sequence of DMRS ports according to the following equation (3): [ka] where w f (k'), w t(l'), and Δ are given by Table 7. l is based on Table 2, Table 3, or Table 4. The first category DMRS ports may include DMRS ports 0 to 11, and the third category DMRS ports may include DMRS ports 12 to 23. The first category DMRS ports 0 to 7 are [ka] Same across w t The third category of DMRS ports 8 to 15 may correspond to (l'). [ka] Different w t Each CDM group may correspond to two FDM-OCCw f For three CDM groups, one w t (l') may have six orthogonal DMRS ports. The 24 orthogonal DMRS ports for the third category of DMRS ports may be divided into four orthogonal TD-OCCw t(l'), while DMRS ports 12-23 may be determined, utilized, or assigned to be third category DMRS ports. DMRS numbers 0-11 may be shared between first category DMRS ports and third category DMRS ports. The TD-OCC length for DMRS ports 0-11 may be assumed to be 4 or 2. Which TD-OCC length is used by the gNB to acquire channels based on DMRS ports 0-11 may be determined by the gNB and may depend on the total number of layers assigned to the UE. For example, if UE1 is assigned DMRS port {0, 1} and there are fewer than 12 simultaneously scheduled UEs, the gNB may acquire or be assigned channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 2. If UE1 is assigned DMRS port {0, 1} and there are 12 or more co-scheduled UEs of UE1, the gNB may acquire or be assigned to channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 4. For example, if UE1 is assigned DMRS port {0, 1} and there are fewer than four co-scheduled UEs in the same CDM group, the gNB may acquire or be assigned to channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 2. If UE1 is assigned DMRS port {0, 1} and there are more than four co-scheduled UEs in the same CDM group, the gNB may acquire or be assigned to channels from UE1 on DMRS port {0, 1} according to a TD-OCC of length 4. [Table 7]

[0099] In one aspect, l' can be obtained from Table 8. When the number of OFDM symbols in one DMRS OFDM symbol group is equal to 1, the value of l' may include 0. When the number of OFDM symbols in one DMRS OFDM symbol group is equal to 2, the value of l' can be 0 or 1. Table 8 also provides a mapping between DMRS numbers and parameters.

[0100] w when l'=1 in Tables 5 to 7 t (l') may be ignored if the number of DMRS OFDM symbols in one DMRS OFDM symbol group is equal to the value of 1. The maximum number of consecutive OFDM symbols in one DMRS OFDM symbol group may be configured by the parameter max-length. If max-length is configured to be 2, the actual number of consecutive OFDM symbols in one DMRS OFDM symbol may be one value from {1, 2} indicated by the DCI. As shown in Table 8, for Type I and single-symbol DMRS in one DMRS OFDM symbol group, w t Since (l') has one element corresponding to l'=0, DMRS ports of {0, 1, 2, 3, 8, 9, 10, 11} are supported. [Table 8]

[0101] For PUSCH transmission, if the UE is configured by RRC signaling / MAC-CE signaling with DMRS type I, the maximum number of OFDM symbols in one DMRS OFDM symbol group is 1, and the UE is indicated Y layers in the DCI, where Y belongs to the set {1, 2, 3, 4} or is a value belonging to the set {1, 2, 3, 4, 5, 6, 7, 8}, the UE may be indicated Y DMRS ports from DMRS ports {0 to 3, 8, 9, 10, 11} by the DCI.

[0102] For PUSCH transmission, if the UE is configured by RRC signaling / MAC-CE signaling with DMRS type II, the maximum number of OFDM symbols in one DMRS OFDM symbol group is 1, and the UE is indicated Y layers in the DCI, where Y is a value belonging to the set {1, 2, 3, 4} or a value belonging to the set {1, 2, 3, 4, 5, 6, 7, 8}, the UE may be indicated Y DMRS ports from DMRS ports {0-5, 12-17} by the DCI.

[0103] Specifically, for PUSCH transmission, if the UE is configured by RRC signaling / MAC-CE signaling, the maximum number of OFDM symbols in one DMRS OFDM symbol group is 1, and DMRS Type I or Type II is used, a DMRS table may exist that includes a mapping between the value of the DMRS bit field in the DCI and a first DMRS parameter. The first DMRS parameter may include the number of CDM groups with no data and Y DMRS ports from DMRS ports {0 to 3, 8, 9, 10, 11} for Type I or {0 to 5, 12 to 17} for Type II. The UE may obtain a power offset between the DMRS and the PUSCH according to the number of CDM groups with no data. The UE may also obtain REs to which the PUSCH may not be mapped according to the number of CDM groups with no data. The UE may determine the Y DMRS ports and the number of CDM groups with no data according to the DMRS mapping and the value of the DMRS bit field indicated in the DCI. Each Y may correspond to one DMRS mapping table. Y may be determined by other fields in the DCI, such as a TPMI bit field or an SRI (SRS Resource Indication) field. If Y is indicated as 1 in the DCI, the DMRS table may be as shown in Table 9 or Table 10. In Table 9, when the UE is indicated with a third category DMRS port, the number of CDM groups with no data may be 2. However, in Table 10, when the UE is indicated with a third category DMRS port in CDM group 1, the number of CDM groups with no data may be 2. When the UE is indicated with a third category DMRS port in CDM group 0, the number of CDM groups with no data may be one of 1 or 2, where 1 and 2 may correspond to different values ​​in the table. The actual number from {1, 2} may be indicated by the DCI as shown in values ​​6 to 9 in Table 10. If Y is greater than 1, the Y DMRS ports may include one category DMRS port for one value in one DMRS mapping table.Alternatively, if Y is greater than 1, the Y DMRS ports may include two categories of DMRS ports for one value of one DMRS mapping table. The two categories of DMRS ports for one value may be in one CDM group or in different CDM groups. [Table 9] [Table 10]

[0104] For PUSCH transmission, if the UE is configured by RRC signaling / MAC-CE signaling with DMRS type I, the maximum number of symbols in one DMRS OFDM symbol group is 2, and the UE is indicated Y layers in the DCI, where Y belongs to {1, 2, 3, 4} or belongs to {1, 2, 3, 4, 5, 6, 7, 8}, the UE may be indicated Y DMRS ports from DMRS ports {0 to 15} by the DCI.

[0105] For PUSCH transmission, if the UE is configured by RRC signaling / MAC-CE signaling with DMRS type II, the maximum number of symbols in one DMRS OFDM symbol group is 2, and the UE is indicated Y layers in the DCI, where Y belongs to {1, 2, 3, 4} or belongs to {1, 2, 3, 4, 5, 6, 7, 8}, the UE may be indicated Y DMRS ports from DMRS ports {0 to 23} by the DCI.

[0106] Specifically, for PUSCH transmission, when the UE is configured by RRC signaling / MAC-CE signaling, the maximum number of symbols in one DMRS OFDM symbol group is two, and the DMRS is Type I or Type II, the DMRS table may include a mapping between the value of the DMRS bit field of the DCI and a first DMRS parameter. The first DMRS parameter may include the number of CDM groups with no data, Y DMRS ports from DMRS ports {0 to 15} for Type I or from DMRS ports {0 to 23} for Type II, and the number of consecutive OFDM symbols in one DMRS OFDM symbol group. Each Y may correspond to one DMRS mapping table. In the first implementation, if the Y DMRS ports include a DMRS port of the third category, the number of CDM groups with no data may be two, and the number of consecutive OFDM symbols in one DMRS OFDM symbol group may be two. In a second implementation, if the Y DMRS ports include a third category DMRS port in CDM group 0, such as including one or more DMRS ports from {8, 9, 12, 13}, and no DMRS port in CDM group 1, the number of CDM groups with no data may be one from {1, 2}, and the number of consecutive OFDM symbols in one DMRS OFDM symbol group may be 2. A different number of CDM groups with no data may correspond to different values ​​of the DMRS table for the Y DMRS ports. In a third implementation, if the Y DMRS ports include a third category DMRS port in CDM group 0, and the same w tIf the DMRS bit field corresponds to (l') and does not include a DMRS port in CDM group 1, the number of CDM groups without data can be one from {1, 2}, and the number of consecutive OFDM symbols in one DMRS OFDM symbol group can be one from {1, 2}. One value of the DMRS bit field corresponds to one number of CDM groups without data and one number of consecutive OFDM symbols in one DMRS OFDM symbol group. Then, if the DMRS bit field includes a second DMRS port in CDM group 0 and has the same w across l'=0 and l'=1, t For one same combination of Y DMRS ports corresponding to (l') and not including a DMRS port in CDM group 1, there will be four values ​​in the DMRS table, each of which corresponds to one combination of the number of CDM groups with no data from {1, 2} and the number of consecutive OFDM symbols in one DMRS OFDM symbol group from {1, 2}. For example, for Type I, if the Y DMRS ports include one or two DMRS ports from {8, 9}, such as {8, 9}, there will be four entries in the DMRS table, as shown in Table 11: A second DMRS port in CDM group 0, with different w values ​​across l'=0 and l'=1. t For one same combination of Y DMRS ports corresponding to (l') and not including any DMRS ports in CDM group 1, there will be two values ​​in the DMRS table, each of which corresponds to one combination of the number of CDM groups with no data from {1, 2} and the number of consecutive OFDM symbols in one DMRS OFDM symbol group, which may be 2. [Table 11]

[0107] The numbers 1, 2, and 3 of CDM groups with no data shown in Tables 9-11 may refer to CDM groups {0}, {0, 1}, and {0, 1, 2} shown in Tables 1, 5-7, respectively.

[0108] In some implementations, the second category DMRS ports include fourth category DMRS ports where X = 3. One DMRS table includes first category DMRS ports whose TD-OCC includes one DMRS OFDM symbol group and fourth category DMRS ports whose TD-OCC includes three DMRS OFDM symbol groups. For example, X is 3. The UE may assume a sequence of DMRS ports according to equation (1) or (4) for the fourth category DMRS ports for DMRS Type I. [ka] where w f (k'), w t (l'), and Δ are given by Table 12 or Table 13. [Table 12] [Table 13]

[0109] Specifically, the UE may assume a sequence of DMRS ports according to equation (3) or (5) for the fourth category DMRS ports for DMRS Type II. [ka] where w f (k'), w t (l'), and Δ are given by Table 14 or Table 15. [Table 14] [Table 15]

[0110] As shown in Tables 12 to 15, for the fourth category DMRS port, one w t(l') can be determined, and another w t (l') is [1,1,1]. Because it shares the same sequence as the DMRS ports in the first category, the DMRS port numbers of the DMRS ports in the first category and some of the DMRS ports in the fourth category share the same DMRS port number because their sequences are the same. For example, Type I DMRS ports 0-7 and Type II DMRS ports 0-11 can share the same DMRS port number. The actual categories of Type I DMRS ports 0-7 and Type II DMRS ports 0-11 depend on the gNB implementation and the total number of layers assigned to the MU UE.

[0111] The DMRS table, which includes a mapping between the values ​​of the bit fields in the DCI and the first DMRS parameter, is selected by the DMRS type, the maximum number of OFDM symbols in one DMRS OFDM symbol group, the second parameter, the number of DMRS ports, and the total number of DMRS OFDM symbol groups for one PUSCH. The second parameter may be named a new table selection parameter or the maximum number of DMRS OFDM symbol groups in one TD-OCC. The second parameter is a 1-bit parameter. If the second parameter is configured (or configured with a value of 1), the DMRS table may include at least one of Type I DMRS ports {8 to 15}, and the DMRS table may include at least one of Type II DMRS ports {12 to 23}. If the second parameter is configured (or configured with a value of 1), the valid DMRS ports may be as shown in Table 8; otherwise, the valid DMRS ports may be as shown in Table 16.

[0112] The total number of DMRS OFDM symbol groups is the same as that shown in Table 2, Table 3, or Table 4. [ka] The number of DMRS ports may be determined by the number of DMRS ports. For example, in the case of DMRS Type I, if the total number of DMRS OFDM symbol groups belongs to {1, 2, 4}, a DMRS table including DMRS ports of the first category and DMRS ports of the third category is selected for each number of DMRS ports. If the total number of DMRS OFDM symbol groups belongs to {3}, another DMRS table including DMRS ports of the first category and DMRS ports of the fourth category is selected for one number of DMRS ports. In another implementation, for example, in the case of DMRS Type I and one number of DMRS ports, the total numbers of DMRS OFDM symbol groups {1}, {2, 4}, and {3} may be associated with the first, second, and third DMRS tables, respectively. The first DMRS table may include DMRS ports of the first category. The second DMRS table may include DMRS ports of the first category and DMRS ports of the third category. The third DMRS may include a DMRS port of the first category and a DMRS port of the fourth category. If the number of OFDM symbols in one OFDM symbol group is 1, the total number of DMRS OFDM symbol groups may be equal to 3. [Table 16] For example, the DMRS table is selected as shown in Table 17. [Table 17]

[0113] In some implementations, a DMRS table containing a mapping between the values ​​of the bit fields in the DCI and the first DMRS parameter is selected by the DMRS type, the maximum number of OFDM symbols in one DMRS OFDM symbol group, the second parameter, and the number of DMRS ports. One DMRS table may then contain DMRS ports of the first category, DMRS ports of the third category, and DMRS ports of the fourth category. DMRS port numbers 8 through 15 may then be replaced with 16 through 23 in Tables 12 and 13, and DMRS port numbers 12 through 17 may be replaced with 24 through 29 in Tables 14 and 15. An exemplary mapping between DMRS port numbers and the second DMRS parameter is shown in Table 14. The DMRS parameter may include the DMRS type and the number of OFDM symbols in one DMRS OFDM symbol group.

[0114] For example, the DMRS table is selected as shown in Table 18. DMRS port numbers 8 to 15 for Type I (or DMRS port numbers 12 to 23 for Type II) may be shared between the third category DMRS ports and the fourth category DMRS ports as shown in Tables 5, 6, 12, and 13 for Type I, or Tables 7, 14, and 15. The categories of DMRS ports 8 to 15 for Type I (or DMRS ports 12 to 23 for Type II) are determined by the duration of the PUSCH. d and the total number of DMRS OFDM groups determined according to the number of additional DMRS positions. For example, for DMRS Type I, if a UE is shown DMRS ports 8 and 9 and the total number of DMRS OFDM symbol groups is 3, DMRS ports 8 and 9 may be DMRS ports of the fourth category as shown in Table 4. If a UE is shown DMRS ports 8 and 9 and the total number of DMRS OFDM symbol groups is 2 / 4, DMRS ports 8 and 9 may be DMRS ports of the third category as shown in Table 5 or Table 6. [Table 18]

[0115] In the above implementation, DMRS ports may be shared between DMRS ports of the first category and DMRS ports of the fourth category, and the category of the DMRS ports may depend on the total DMRS OFDM symbols of one PUSCH transmission opportunity. In another implementation, if one DMRS table includes DMRS ports of the first category, DMRS ports of the third category, and DMRS ports of the fourth category, and the DMRS port numbers between the third category and the fourth category are not shared but are different, DMRS port numbers 8 to 15 may be replaced with 16 to 23 in Tables 12 and 13, and DMRS port numbers 12 to 17 may be replaced with 24 to 29 in Tables 14 and 15. The mapping between DMRS port numbers and second DMRS parameters is shown in Table 14. The DMRS parameters include the DMRS type and the number of OFDM symbols in one DMRS OFDM symbol group. [Table 19]

[0116] Then, for DMRS Type I and a maximum number of OFDM symbols in one DMRS OFDM symbol of 1 and Y DMRS ports, the DMRS table may indicate that Y DMRS ports from {0 to 3, 8 to 11, 16 to 19} are indicated by the DCI. The DMRS table may include a mapping between values ​​of the DMRS bit field in the DCI and second DMRS parameters. The second DMRS parameters may include the number of CDM groups with no data and the Y DMRS ports from {0 to 3, 8 to 11, 16 to 19}.

[0117] In some implementations, X DMRS OFDM symbol groups are in one slot, where X can be one of {2, 3}. In other implementations, the X DMRS OFDM symbol groups are in more than one slot. The more than one slots can be consecutive slots. The more than one slots can be consecutive available slots. The available slots can satisfy some condition. For example, the condition includes the absence of a scheduled PUSCH OFDM symbol that is a downlink OFDM symbol. The condition includes the absence of a scheduled PDSCH OFDM symbol that is an uplink OFDM symbol.

[0118] In some cases, the total number of DMRS OFDM symbol groups is 1, as shown in one of Tables 2-3. For example, in the case of PUSCH mapping type A, the duration is 1. d belongs to {4, 5, 6, 7}, [ka] includes l0. The gNB may not allocate a third category DMRS port to the UE in this case.

[0119] The fourth category of DMRS ports can be applied when the number of OFDM symbols in one DMRS OFDM symbol group is 1 and the total number of DMRS OFDM symbol groups is 1.

[0120] In some implementations, the UE receives a value of the DMRS table from the gNB in ​​signaling. The UE can obtain the first parameter according to the value and the DMRS table. The signaling may include one of DCI that triggers the PUSCH, RRC signaling that configures the PUSCH, or MAC-CE that activates the PUSCH.

[0121] In some implementations, a DMRS table may include multiple categories of DMRS ports. Different categories of DMRS ports may correspond to different numbers of consecutive DMRS OFDM symbols within a DMRS OFDM symbol group. The TD-OCCs of multiple categories of DMRS ports may correspond to the same number of DMRS OFDM symbol groups. For example, the TD-OCCs of multiple categories of DMRS ports may correspond to one DMRS OFDM symbol group. There may be a first category of DMRS port with a TD-OCC corresponding to one consecutive DMRS OFDM symbol, a second category of DMRS port with a TD-OCC corresponding to two consecutive DMRS OFDM symbols, and a third category of DMRS port with a TD-OCC corresponding to four consecutive DMRS OFDM symbols. Example 2

[0122] For DMRS of PDSCH, one DMRS table may include multiple categories of DMRS ports. The multiple categories of DMRS ports correspond to different numbers of DMRS OFDM groups within one TD-OCC. Each OFDM group may include one or more consecutive OFDM symbols. For example, one OFDM group may include one or two consecutive OFDM symbols. Different OFDM groups may include non-consecutive OFDM symbols. In one aspect, the gap between two DMRS OFDM symbol groups is greater than zero.

[0123] The DMRS table contains a mapping between the values ​​of the DMRS bit field in the DCI and the first DMRS parameter.

[0124] In some implementations, one DMRS table includes DMRS ports of the first category and DMRS ports of the third category.

[0125] For the first category DMRS port and Type I, the UE may obtain the sequence of DMRS ports according to the following equation (1): [ka] Table 1, except for the above, is based on Table 20 or Table 21.

[0126] For DMRS on PDSCH, the reference point for l and the position l0 of the first DM-RS symbol in Equations 1-5 may depend on the mapping type. For PDSCH mapping type A, l is defined or determined relative to the start of the slot, and l0=3 if the higher layer parameter dmrs-TypeA-Position is equal to "pos3" and l0=2. For PDSCH mapping type B, l is defined relative to the start of the scheduled PDSCH resource, and l0=0.

[0127] The position of the DM-RS symbol is [ka] and duration l d For example, in the case of PDSCH mapping type A, l d l can be the duration between the first OFDM symbol of a slot and the last OFDM symbol of a scheduled PDSCH resource in the slot. For PDSCH mapping type B, l d may be the duration of the scheduled PDSCH resource. Table 20 may be applicable when the number of OFDM symbols in one DMRS OFDM symbol group is 1, and Table 21 may be applicable when the number of OFDM symbols in one DMRS OFDM symbol group is 2. In some embodiments, l1 is 11 or 12 depending on the higher layer configuration. [Table 20] [Table 21]

[0128] For the third category and Type I DMRS ports, the UE may obtain the sequence of DMRS ports according to the following equation (1) or (2): [ka] Except Table 5, which may be based on Table 20 or Table 21.

[0129] Alternatively, for DMRS Type I, the first category DMRS port and the third category DMRS port according to Equation (1) can be coupled together, [ka] Except Table 6 may be based on Table 20 or Table 21 for Type I.

[0130] For DMRS ports of the third category and DMRS Type II, the UE may obtain the sequence of DMRS ports according to the following equation (3): [ka] Except Table 7, which may be based on Table 20 or Table 21.

[0131] In some implementations, one DMRS table includes DMRS ports of the first category and DMRS ports of the fourth category.

[0132] For DMRS ports of the fourth category and DMRS Type I, the UE may obtain the sequence of DMRS ports according to the following equation (4): [ka] Except Table 12 or Table 13 may be based on Table 20 or Table 21.

[0133] For DMRS ports of the fourth category and DMRS Type II, the UE may obtain the sequence of DMRS ports according to the following equation (5): [ka] Except Table 14 or Table 15 may be based on Table 20 or Table 21.

[0134] In some implementations, one DMRS table includes a first category DMRS port, a third category DMRS port, and a fourth category DMRS port. The third and fourth categories may share the same DMRS port. The category of the DMRS port may depend on the total number of DMRS OFDM symbol groups in one transmission opportunity of the PDSCH.

[0135] The DMRS table may be selected by the DMRS type, the maximum number of OFDM symbols in one DMRS OFDM group, and the second parameter. The second parameter may be a 1-bit parameter. When the second parameter is configured (or configured with a value of 1), the DMRS table includes the first category, and DMRS ports of the third category are enabled, such as a DMRS table including at least one of DMRS ports {8 to 15} for Type I and a DMRS table including at least one of DMRS ports {12 to 23} for Type II being enabled. When the second parameter is not configured (or configured with a value of 0), the DMRS table may include DMRS ports of the first category that are enabled. When the second parameter is configured (or configured with a value of 1), the mapping between the third DMRS parameter and the DMRS ports may be as shown in Table 8; otherwise, the mapping between the third DMRS parameter and the DMRS ports may be as shown in Table 16. In one aspect, the second parameter is used to enable or disable a new DMRS port. If the second parameter is configured (or configured with a value of 1), the second category DMRS ports, such as the third category DMRS ports or the fourth category DMRS ports, may be enabled; otherwise, only the first category DMRS ports may be enabled.

[0136] Unlike the DMRS table for PUSCH, the DMRS table for PDSCH may not be selected according to the number of DMRS ports, and one DMRS table for PDSCH may contain different entries containing different numbers of DMRS ports.

[0137] For example, the DMRS table for the PDSCH may be selected as shown in Table 22. Tables m1 to m4 may correspond to DMRS ports of the first category. For Tables m1 and m2, the first parameter includes the number of CDM groups with no data and the DMRS port number. One DMRS table includes different entries containing different numbers of DMRS port numbers. The UE also obtains the number of DMRS ports from the table and the value indicated in the DCI. For Table m1, Y DMRS ports are selected from DMRS ports 0 to 3 shown in Table 1, where Y includes 1, 2, 3, and 4. When Table m1 is selected, only one codeword can be enabled. For Table m2, Y DMRS ports are selected from DMRS ports 0 to 5 shown in Table 7, where Y includes 1, 2, 3, 4, 5, and 6.

[0138] For Tables m3 and m4, the first parameters include the number of CDM groups with no data, the DMRS port number, and the number of symbols in one DMRS OFDM symbol group. In Table m3, Y DMRS ports are selected from DMRS ports 0 to 7 shown in Table 1, where Y includes 1, 2, 3, 4, 5, 6, 7, and 8. When Table m1 is selected, one codeword can be enabled. In Table m4, Y DMRS ports are selected from DMRS ports 0 to 11 shown in Table 7, where Y includes 1, 2, 3, 4, 5, 6, 7, and 8. [Table 22]

[0139] In Table m5 and Table m7, the first parameters may include the number of CDM groups with no data, the DMRS port number, and the number of DMRS ports. The first parameters may further include a third DMRS parameter, which may include at least one of the TD-OCC length of the DMRS ports in the first DMRS set and the DMRS ports of the co-scheduled UEs. As shown in Table 6 or Table 7, the DMRS port number / index may be shared among the first, third, and fourth categories. For example, Type I DMRS ports 0-7 (or Type II DMRS ports 0-11) share the same DMRS port number between the first category DMRS port and the second or fourth category DMRS port. The TD-OCC length of Type I DMRS ports 0-7 (the TD-OCC length of Type II DMRS ports 0-11) may be further indicated in the DMRS table. The first DMRS set may include Type I DMRS ports 0 through 7 or Type II DMRS ports 0 through 11. An example of Table m5 is shown in Table 23. As shown in Table 23, the third DMRS parameter may be named according to whether the number of DMRS OFDM symbol groups in one TD-OCC is greater than one. If the third DMRS parameter is determined to be one, there may be more than one DMRS OFDM symbol group in one TD-OCC. If the DMRS table includes only first category DMRS ports and third category DMRS ports, but no fourth category DMRS ports, and the third DMRS parameter is determined to be one, the number of DMRS OFDM symbol groups in one TD-OCC may be two, and the length of the TD-OCC is equal to two multiplied by the number of symbols in one DMRS OFDM symbol.If the DMRS table includes a first category DMRS port, a third category DMRS port, and a fourth category DMRS port, and the third DMRS parameter is determined to be 1, the number of DMRS OFDM symbol groups for one TD-OCC may be 2 or 3, as determined by the total number of DMRS symbol groups for one transmission opportunity, and the length of the TD-OCC is equal to 2 or 3 multiplied by the number of symbols in one DMRS OFDM symbol. Alternatively, for PUSCH, the first category DMRS port and the second category DMRS may share the same DMRS index, while for PDSCH, the first category DMRS port and the second category DMRS may not share the same DMRS index but may have different DMRS indices. The length of the TD-OCC may be obtained based on the indexes of the DMRS ports.

[0140] In table m5, Y DMRS ports may be selected from DMRS ports {0-3, 8-11} shown in table 6, where Y may include 1, 2, 3, 4, 5, 6, 7, and 8. When table m5 is selected, up to two codewords may be enabled. In table m6, Y DMRS ports may be selected from DMRS ports {0-5, 12-17} shown in table 7, where Y may include 1, 2, 3, 4, 5, 6, 7, and 8.

[0141] In table m7, Y DMRS ports may be selected from DMRS ports 0 to 15 shown in Table 6, where Y may include 1, 2, 3, 4, 5, 6, 7, and 8. When table m5 is selected, up to two codewords may be enabled. In table m8, Y DMRS ports may be selected from DMRS ports 0 to 23 shown in Table 7, where Y may include 1, 2, 3, 4, 5, 6, 7, and 8.

[0142] The UE may also determine which set of DMRS ports includes potential co-scheduled UEs according to a third DMRS parameter. For example, for a value of 0 for one codeword shown in Table 23, the UE may assume that a potential co-scheduled UE may be assigned DMRS port 1, while for a value of 12 for one codeword shown in Table 23, the UE may assume that a potential co-scheduled UE may be assigned DMRS ports 1, 8, and 9. The set of DMRS ports including potential co-scheduled UEs may be determined by the third parameter. If the third parameter is 0, the set may include DMRS ports of the first category. If the third parameter is 1, the set may include DMRS ports of the third category. [Table 23-1] [Table 23-2]

[0143] The first DMRS parameter may include a fourth DMRS parameter including at least one of the following: the length of the TD-OCC of the DMRS port in each CDM group that has no data; the number of DMRS OFDM symbol groups included in one TD-OCC in each CDM group that has no data; the relationship between the lengths of the TD-OCC of the DMRS port in different CDM groups that has no data; or the relationship between the number of DMRS OFDM symbol groups included in one TD-OCC in different CDM groups that has no data. The UE can obtain the DMRS ports of potentially co-scheduled UEs based on the fourth parameter. For example, for values ​​15 to 23 of one codeword in Table 23, the set of DMRS ports including potentially co-scheduled UEs in CDM group 1 may include first-category DMRS ports in CDM group 1, such as DMRS ports {2, 3}, or may include third-category DMRS ports in CDM group 1, such as DMRS ports {2, 3, 10, 11}. This may be further indicated by the fourth DMRS parameter. The length of the TD-OCC of a DMRS port is equal to the number of DMRS OFDM symbol groups included in one TD-OCC multiplied by the number of OFDM symbols in one DMRS OFDM symbol group.

[0144] In some implementations, the first parameter does not include the fourth DMRS parameter, and the UE can determine that TD-OCCs of the same length are used for different CDM groups. For example, for values ​​15-23 of one codeword in Table 23, the TD-OCC length of the set of DMRS ports including potentially co-scheduled UEs in CDM group 1 may be equal to that in CDM group 0, i.e., the TD-OCC length is equal to 2, so the TD-OCC length may include DMRS ports of the third category in CDM group 1, such as DMRS ports {2, 3, 10, 11}.

[0145] In the case of Table m6 and Table m8, the first parameters may include the number of CDM groups with no data, a DMRS port number, and the number of symbols in one OFDM symbol group. The first DMRS parameters may further include a third DMRS parameter and / or a fourth DMRS parameter.

[0146] The second parameters for the uplink DMRS port and the downlink DMRS port can be configured separately or together, and if they are configured separately, there may be two independent configurations of the second parameters for the uplink DMRS port and the downlink DMRS port, respectively.

[0147] In some implementations, one DMRS table may include multiple categories of DMRS ports. Different categories of DMRS ports may correspond to different numbers of consecutive DMRS OFDM symbols within one DMRS OFDM symbol group. The TD-OCCs of multiple categories of DMRS ports may correspond to the same number of DMRS OFDM symbol groups. For example, the TD-OCCs of multiple categories of DMRS ports may correspond to one DMRS OFDM symbol group. There may be a first category of DMRS port with a TD-OCC corresponding to one consecutive DMRS OFDM symbol, a second category of DMRS port with a TD-OCC corresponding to two consecutive DMRS OFDM symbols, and a third category of DMRS port with a TD-OCC corresponding to four consecutive DMRS OFDM symbols.

[0148] FIG. 5 illustrates a flow diagram of a method 500 for communicating in accordance with a DMRS port indication based on a DMRS table, according to one embodiment of the present disclosure. Method 500 may be implemented using any of the components and devices detailed herein in conjunction with FIGS. 1-4. Briefly, a wireless communication node may transmit first information for a wireless communication device to determine a first DMRS table (505). The wireless communication device may receive the first information and determine the first DMRS table according to the first information (510). The wireless communication node may transmit signaling to the wireless communication device (515). The wireless communication device may receive signaling including a value of a field (520). The wireless communication device may determine a first DMRS parameter according to the first DMRS table and the value of the field (530). The wireless communication device may communicate signals with the communication node (540 and 545).

[0149] More specifically, the wireless communication node may transmit first information for the wireless communication device to determine the first DMRS table 505. The first information may include at least one of a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, or a number of DMRS ports.

[0150] The wireless communication device may receive first information and determine a first DMRS table according to the first information (510). In one aspect, the wireless communication device stores multiple DMRS tables. The wireless communication device may determine the first DMRS table according to the first information. For example, the wireless communication device may determine the first DMRS table according to at least one of a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, and a number of DMRS ports. In one aspect, the first DMRS table includes a mapping between values ​​of a field of the signaling and values ​​of the first DMRS parameter. Each of the values ​​of the field may be associated with a respective one of the values ​​of the first DMRS parameter. In one aspect, the first DMRS table includes a first DMRS parameter having values ​​associated with at least two categories of DMRS ports. In one aspect, some values ​​of the first DMRS parameter are associated with one category. Other values ​​may be associated with multiple categories. The different categories of the at least two categories of DMRS ports may correspond to at least one of different numbers of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one time-domain orthogonal cover code (TD-OCC), different numbers of DMRS OFDM symbols of one TD-OCC, different numbers of DMRS OFDM symbols within one DMRS OFDM symbol group of one TD-OCC, or different relationships between vectors of one TD-OCC. Each DMRS OFDM symbol group may include one or more consecutive OFDM symbols.

[0151] The wireless communication node may transmit signaling to the wireless communication device 515. Examples of the signaling include downlink control information (DCI) signaling, radio access control (RRC) signaling, or medium access control control element (MAC-CE) signaling. The wireless communication device may receive the signaling 520. The signaling may include one or more fields.

[0152] The wireless communication device may determine the first DMRS parameter according to the first DMRS table and the value of the field (530). In some embodiments, the number of bits in the field is indicated by or determined according to the first DMRS information. Thus, the wireless communication device may receive a signal and determine, detect, or identify the field according to the number of bits indicated by the first DMRS information. The wireless communication device may apply the value of the field as an index to the first DMRS table and determine, obtain, or identify the first DMRS parameter stored in an entry of the first DMRS table associated with the index.

[0153] The wireless communication device may communicate a signal with the communication node (540 and 545). For example, the wireless communication device may select, control, or configure a DMRS port according to the first DMRS parameter. Via the determined DMRS port, the wireless communication device and the wireless communication node may communicate with each other. For example, the wireless communication device may transmit a signal on a PUSCH using the determined DMRS port or receive a signal on a PDSCH according to the determined DMRS port and / or the determined first DMRS parameter. The wireless communication device may obtain information / DMRS ports of potential co-scheduled wireless communication devices of the wireless communication device to decode signals on the PDSCH according to the first DMRS parameter. For example, the wireless communication device may obtain / receive interference from the wireless communication device's potential co-scheduled wireless communication devices to decode signals on the PDSCH according to the determined first DMRS parameter.

[0154] While various embodiments of the present solution have been described above, it should be understood that they are presented by way of example only, and not by way of limitation. Similarly, various diagrams may depict example architectures or configurations provided to enable those skilled in the art to understand example features and functionality of the present solution. However, such skilled artisans will understand that the solution is not limited to the example architectures or configurations shown, but may be implemented using various alternative architectures and configurations. Furthermore, as will be understood by those skilled in the art, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the example embodiments described above.

[0155] It will also be understood that any reference to an element herein using a designation such as "first," "second," etc., does not generally limit the quantity or order of those elements. Rather, these designations may be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to a first and a second element does not imply that only two elements can be used or that the first element must precede the second element in any way.

[0156] Additionally, those skilled in the art will understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, and symbols that may be referred to in the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0157] Those skilled in the art will further appreciate that any of the various illustrative logic blocks, modules, processors, means, circuits, methods, and functions described in connection with the aspects disclosed herein may be implemented by electronic hardware (e.g., digital implementations, analog implementations, or a combination of the two), firmware, various forms of programs or design code incorporating instructions (which may be referred to herein for convenience as “software” or “software modules”), or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware, and software, the various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these techniques, depends on the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functions in various ways for each particular application, and such implementation decisions do not depart from the scope of the present disclosure.

[0158] Furthermore, those skilled in the art will understand that the various example logic blocks, modules, devices, components, and circuits described herein may be implemented within or performed by an integrated circuit (IC), which may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logic blocks, modules, and circuits may further include an antenna and / or transceiver for communicating with various components within a network or device. A general-purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration for performing the functions described herein.

[0159] If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media, including any medium that can enable a computer program or code to be transferred from one place to another. A storage medium can be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.

[0160] In this document, the term "module" as used herein refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purposes of explanation, various modules are described as individual modules, however, as will be apparent to one skilled in the art, two or more modules may be combined to form a single module that performs associated functions according to embodiments of the present solution.

[0161] Additionally, memory or other storage, as well as communication components, may be used in embodiments of the solution. It will be appreciated that, for clarity, the above description describes embodiments of the solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements, or domains may be used without detracting from the solution. For example, functionality shown to be performed by separate processing logic elements or controllers may be performed by the same processing logic element or controller. Thus, references to specific functional units do not indicate a strict logical or physical structure or organization, but merely to suitable means for providing the described functionality.

[0162] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. 1. A method, comprising: determining, by the wireless communication device, a first demodulation reference signal (DMRS) table according to first information from the wireless communication node; receiving, by the wireless communication device, a value of a field in signaling from the wireless communication node; determining a first DMRS parameter according to the first DMRS table and the value of the field; Including, the first DMRS table includes a mapping between a plurality of values ​​of the field of the signaling and a plurality of values ​​of the first DMRS parameter, each of the plurality of values ​​of the field being associated with a respective one of the plurality of values ​​of the first DMRS parameter; the first DMRS table includes the first DMRS parameters for at least two categories of DMRS ports, and a plurality of different categories of the at least two categories of DMRS ports differ from one another based on at least one of: each category of the plurality of different categories corresponds to a different number of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one Time-Domain Orthogonal Cover Code (TD-OCC); each category of the plurality of different categories corresponds to a different number of DMRS OFDM symbols of one TD-OCC; or each category of the plurality of different categories corresponds to a different number of DMRS OFDM symbols in one DMRS OFDM symbol group of one TD-OCC; each of the DMRS OFDM symbol groups includes one or more consecutive OFDM symbols; the first DMRS parameters include a number of code division multiplexing (CDM) groups with no data and Y DMRS ports, where Y is a positive integer less than 9; 2. The method of claim 1, wherein if the maximum number of OFDM symbols in one DMRS OFDM symbol group is greater than one, the first DMRS parameter further includes the number of consecutive OFDM symbols in one OFDM symbol group.

2. The method comprises: the wireless communication device: a category of DMRS ports among the Y DMRS ports according to the total number of OFDM symbol groups included in one transmission opportunity; or The length of the TD-OCC of a DMRS port among the Y DMRS ports is determined according to the total number of DMRS OFDM symbol groups included in one TD-OCC multiplied by the total number of DMRS OFDM symbols in one DMRS OFDM symbol group. Determining at least one of The method of claim 1 further comprising:

3. 1. A method, comprising: a wireless communication node transmitting first information to a wireless communication device to determine a first demodulation reference signal (DMRS) table; the wireless communication node transmitting a value of a field in signaling to the wireless communication device; Including, the value of the field is to be used by the wireless communication device to determine a first DMRS parameter according to the first DMRS table and the value of the field; the first DMRS table includes a mapping between a plurality of values ​​of the field of the signaling and a plurality of values ​​of the first DMRS parameter, each of the plurality of values ​​of the field being associated with a respective one of the plurality of values ​​of the first DMRS parameter; the first DMRS table includes the first DMRS parameters for at least two categories of DMRS ports, and a plurality of different categories of the at least two categories of DMRS ports differ from one another based on at least one of: each category of the plurality of different categories corresponds to a different number of DMRS Orthogonal Frequency Division Multiplexing (OFDM) symbol groups of one Time-Domain Orthogonal Cover Code (TD-OCC); each category of the plurality of different categories corresponds to a different number of DMRS OFDM symbols of one TD-OCC; or each category of the plurality of different categories corresponds to a different number of DMRS OFDM symbols in one DMRS OFDM symbol group of one TD-OCC; each of the DMRS OFDM symbol groups includes one or more consecutive OFDM symbols; the first DMRS parameters include a number of code division multiplexing (CDM) groups with no data and Y DMRS ports, where Y is a positive integer less than 9; 2. The method of claim 1, wherein if the maximum number of OFDM symbols in one DMRS OFDM symbol group is greater than one, the first DMRS parameter further includes the number of consecutive OFDM symbols in one OFDM symbol group.

4. There is a gap between the symbols of two adjacent DMRS OFDM symbol groups, the gap being greater than zero OFDM symbols; or OFDM symbols in different DMRS OFDM symbol groups are non-contiguous with respect to each other The method according to any one of claims 1 to 3, wherein the method is at least one of the following:

5. the at least two categories of DMRS ports include a first category of DMRS ports and a second category of DMRS ports; 5. The method according to claim 1, wherein the TD-OCC of the first category DMRS port corresponds to one DMRS OFDM symbol group, and the TD-OCC of the second category DMRS port corresponds to X DMRS OFDM symbol groups, where X is an integer value greater than 1.

6. the first DMRS parameters include the Y DMRS ports and the number of CDM groups with no data; The number of CDM groups without data is determined according to at least one of a first category of DMRS ports of the at least two categories of DMRS ports among the Y DMRS ports or a relationship between elements of one TD-OCC; or the values ​​of the first DMRS parameter in the first DMRS table do not include a first value for the number of CDM groups with no data; The method according to any one of claims 1 to 4, wherein the method is at least one of the following:

7. the first DMRS table includes the first DMRS parameters of the at least two categories of DMRS ports; the first DMRS table satisfies at least one of condition i) or condition ii); The condition i) is a) the first DMRS parameter includes the Y DMRS ports, and the Y DMRS ports associated with one value of the field belong to one of the at least two categories; or b) the first DMRS parameter includes the Y DMRS ports, and the Y DMRS ports associated with one value of the field belong to more than one of the at least two categories; It is one of the 7. The method according to claim 1, wherein the condition in ii) is that the first DMRS parameter includes the Y DMRS ports, and the at least two categories of DMRS ports are associated with multiple different values ​​of the field.

8. the number of bits in the field is determined by the first information; or the first DMRS table is selected from a plurality of tables according to the first information; The method according to any one of claims 1 to 7, wherein the method is at least one of the following:

9. the first information includes at least one of a DMRS type between Type I and Type II, a maximum number of OFDM symbols in one DMRS OFDM symbol group, a second DMRS parameter, a total number of OFDM symbol groups included in one transmission opportunity, or the number of the DMRS ports; the second DMRS parameter is at least one of a parameter indicating whether a second category DMRS port of the at least two categories of DMRS ports is enabled or a parameter indicating whether a DMRS port including the second category DMRS port is enabled; The method according to any one of claims 1 to 4, wherein the DMRS type type I and the DMRS type type II correspond to a plurality of different frequency domain patterns of DMRS ports.

10. the at least two categories of DMRS ports are indexed together; The index of the DMRS port is determined by indexing across a first category of DMRS ports of the at least two categories of DMRS ports, and then indexing across a second category of DMRS ports of the at least two categories of DMRS ports; or At least one of the first category DMRS ports and the second category DMRS ports share the same DMRS port index. The method according to any one of claims 1 to 4, wherein the method is at least one of the following:

11. A wireless communication device, the wireless communication device including a processor, the processor configured to perform a method according to claim 1 or claim 2 or any of claims 4 to 10.

12. A wireless communications node, the wireless communications node including a processor, the processor configured to perform a method according to any of claims 3 to 10.

13. A computer readable medium storing instructions which, when executed by at least one processor of a computer, cause the computer to perform the method of any of claims 1 to 10.

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