Systems and methods for reference signaling for wireless communication

Abstract

Systems and methods for wireless communication are presented. In one aspect, a wireless communication device determines a first demodulation reference signal (DMRS) table from first information from a wireless communication node. In one aspect, the wireless communication device receives a value of a field in signaling from the wireless communication node. In one aspect, the wireless communication device determines a first DMRS parameter from the first DMRS table and the value of the field. In one aspect, the first DMRS table comprises a mapping between values of the field of the signaling and values of the first DMRS parameter.

Description

Technical Field

[0001] This disclosure relates generally to wireless communication, including but not limited to systems and methods for indicating demodulation reference signal ports for wireless communication and supporting a larger number of demodulation reference signal (DMRS) ports. Background Technology

[0002] The standards organization 3GPP is currently developing a new radio interface called 5G New Radio (5G NR) and a next-generation packet core network (NG-CN or NGC). 5G NR will have three main components: the 5G Access Network (5G-AN), the 5G Core Network (5GC), and the User Equipment (UE). To facilitate the implementation of different data services and needs, the elements of the 5GC (also known as network functions) have been simplified, some based on software and others on hardware, to allow for customization as needed. Summary of the Invention

[0003] The exemplary embodiments disclosed herein are intended to address problems related to one or more of the problems presented in the prior art, and to provide additional features that will become clear when viewed in conjunction with the accompanying drawings and the following detailed description. Example systems, methods, apparatuses, and computer program products are disclosed herein according to various embodiments. However, it should be understood that these embodiments are presented by way of example and not as limiting, and that it will be apparent to those skilled in the art who read this disclosure that various modifications can be made to the disclosed embodiments while remaining within the scope of this disclosure.

[0004] At least one aspect relates to a system, method, apparatus, or computer-readable medium for conducting 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 receiving point (TRP). In some embodiments, the wireless communication device is a user equipment (UE).

[0005] In some embodiments, a wireless communication device determines a first demodulation reference signal (DMRS) table based on first information from a wireless communication node. In some embodiments, the wireless communication device receives values ​​of fields in signaling from the wireless communication node. In some embodiments, the wireless communication device determines first DMRS parameters based on the first DMRS table and the values ​​of the fields. In some embodiments, the first DMRS table includes a mapping between the values ​​of the fields in the signaling and the values ​​of the first DMRS parameters, and each value in the fields is associated with a corresponding value in the values ​​of the first DMRS parameters. In some embodiments, the first DMRS table includes first DMRS parameters having values ​​associated with 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 the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a Time Domain Orthogonal Covering Code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRS OFDM symbols in a DMRS OFDM symbol group of a TD-OCC, or a different relationship between vectors of a TD-OCC. In some embodiments, each DMRS OFDM symbol group in the DMRS OFDM symbol group includes one or more consecutive OFDM symbols.

[0006] In some embodiments, at least one of the following is true: there is a gap between symbols in two adjacent DMRS OFDM symbol groups, the gap being greater than zero OFDM symbols; or at least some OFDM symbols in different DMRS OFDM symbol groups are discontinuous relative 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 can be an integer value greater than 1.

[0008] In some embodiments, if the wireless communication device is configured with DMRS type I and the maximum number of OFDM symbols in an OFDM symbol group is 1, the wireless communication device can determine Y DMRS ports selected from DMRS ports {0-3,8,9,10,11} based on the value of a first DMRS parameter. Y can 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 can determine Y DMRS ports selected from DMRS ports {0-5, 12-17}. Y can be a positive integer.

[0010] In some embodiments, if the wireless communication device is configured with DMRS type I and the maximum number of OFDM symbols in an OFDM symbol group is 2, the wireless communication device can determine Y DMRS ports selected from DMRS ports {0-15} based on the value of the first DMRS parameter. Y can 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 can determine Y DMRS ports selected from DMRS ports {0-23}. Y can be a positive integer.

[0012] In some embodiments, if the Y DMRS ports include at least one of DMRS ports 8-15, and the number of code division multiplexing (CDM) groups without data is the maximum value, then the first DMRS parameter includes the number of CDM groups without data and the Y DMRS ports.

[0013] In some embodiments, if the Y DMRS ports include at least one DMRS port among DMRS ports 8-15, and the number of DMRS ODMM symbols in a DMRS OFDM symbol group is the maximum value, then the first DMRS parameter includes the number of DMRS OFDM symbols in a 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 other embodiments, DMRS ports 0-7 are both first-category and second-category DMRS ports, and DMRS ports 8-15 are second-category DMRS ports. The first-category and second-category DMRS ports among DMRS ports 0-7 may have the same DMRS port index 0-7.

[0015] In some embodiments, if the Y DMRS ports include at least one of DMRS ports 12-23, and the number of CDM groups without data is a maximum value, then the first DMRS parameter includes the number of CDM groups without data and the Y DMRS ports.

[0016] In some embodiments, if the Y DMRS ports include at least one of DMRS ports 12-23, and the number of DMRS OFDM symbols in a DMRS OFDM symbol group is the maximum value, then the first DMRS parameter includes the number of DMRS OFDM symbols in a 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 both first-category and second-category DMRS ports, and DMRS ports 8-15 are second-category DMRS ports. The first-category and second-category DMRS ports in DMRS ports 0-11 may have the same DMRS port index 0-11.

[0018] In some embodiments, the first DMRS parameter includes Y DMRS ports and the number of CDM groups without data. In some embodiments, the number of CDM groups without data is determined based on at least one of the categories of the Y DMRS ports or the relationship between elements of a TD-OCC. In some embodiments, the value of the first DMRS parameter of the first DMRS table does not include a first value for the number of CDM groups without data and the second category of DMRS ports. In some embodiments, the relationship between elements of a TD-OCC includes whether the TD-OCC includes X repeating vectors comprising one or two elements.

[0019] In some embodiments, the number of CDM groups without data is further determined based on at least one of the relationships between the index of CDM groups including Y DMRS ports or the elements of a TD-OCC. In some embodiments, the value of the first DMRS parameter of the first DMRS table does not include a first value for the number of CDM groups without data and the second category of DMRS ports.

[0020] In some embodiments, if the Y DMRS ports include at least one DMRS port of the second category, the number of CDM groups without data is the maximum value.

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

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

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

[0024] In some embodiments, the first DRMS ​​parameter includes the number of consecutive 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 category of the Y DMRS ports. In some embodiments, the value of the first parameter of the first DMRS table does not include: a first value for the number of consecutive OFDM symbols in an OFDM symbol group, and the second category of DMRS ports.

[0025] In some embodiments, if the Y DMRS ports include DMRS ports of the second category, the number of CDM groups without data is 2, and the number of consecutive OFDM symbols in an OFDM symbol group is the maximum value.

[0026] In some embodiments, the first DMRS parameter includes the number of consecutive OFDM symbols in an Orthogonal Frequency Division Multiplexing (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 the TD-OCC of multiple DMRS OFDM symbols across a DMRS OFDM symbol group, and do not include DMRS ports in CDM group 1, then the number of CDM groups without 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 parameter includes the number of consecutive OFDM symbols in an Orthogonal Frequency Division Multiplexing (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 excluding a DMRS port in CDM group 1, there are four values ​​in the first DMRS table, each of the four values ​​corresponding to a corresponding combination in the four combinations, wherein: the number of CDM groups without 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 of DMRS ports corresponds to the same element of the TD-OCC for multiple DMRS OFDM symbols across a DMRS OFDM symbol group.

[0028] In some embodiments, the first DMRS parameter includes the number of consecutive OFDM symbols in an Orthogonal Frequency Division Multiplexing (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 that includes a second DMRS port in CDM group 0 but excludes a DMRS port in CDM group 1, the first DMRS table contains two values, each corresponding to a corresponding combination of the two combinations, wherein: the number of CDM groups without 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 of DMRS ports corresponds to the same element of the TD-OCC for multiple DMRS OFDM symbols across a DMRS OFDM symbol group.

[0029] In some embodiments, the signaling includes one of downlink control information (DCI) signaling, radio access control (RRC) signaling, or media access control unit (MAC-CE) signaling.

[0030] In some embodiments, the first DMRS parameter includes the number of code division multiplexing (CDM) groups without data and Y DMRS ports, and if the maximum number of OFDM symbols in a DMRS OFDM symbol group is greater than 1, the first DMRS parameter also includes the number of consecutive OFDM symbols in an OFDM symbol group.

[0031] In some embodiments, where the Y DMRS ports are DMRS ports of the Physical Downlink Shared Channel (PDSCH), the first DMRS parameter further includes at least one of the following: the class of the DMRS port, the class of the DMRS port in a CDM group among a plurality of CDM groups without data, the relationship between the classes of the DMRS ports in different CDM groups among a plurality of CDM groups without data, or the length of the TD-OCC for the DMRS ports in a CDM group among a plurality of CDM groups without data. In some embodiments, the DMRS ports or the plurality of DMRS ports are Y DMRS ports of the channel of the wireless communication device, and / or one or more DMRS ports include DMRS ports of the potential co-scheduled wireless communication device of the wireless communication device.

[0032] In some embodiments, the number of bits in the field is determined by first DMRS information. In some embodiments, the first DMRS table is selected from multiple tables based on the first information.

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

[0034] In some embodiments, the second DMRS parameter is used to indicate whether a second category of DMRS ports is enabled. In some embodiments, the second DMRS parameter is used to indicate whether DMRS ports, including second category DMRS ports, are enabled. In some embodiments, the second DMRS parameter is a one-bit parameter. In some embodiments, if the first table includes DMRS ports of the Physical Uplink Shared Channel (PUSCH), and the first information is used to select the first table, then 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 the wireless communication device determining at least one of the following based on the total number of OFDM symbol groups included in a transmission timing: the class of the DMRS ports among the Y DMRS ports, or the TD-OCC length of the DMRS ports of the co-scheduled wireless communication devices in different code division multiplexing (CDM) groups.

[0036] In some embodiments, the first wireless communication device determines at least one of the following based on the total number of OFDM symbol groups included in a transmission timing and Y DMRS ports: the type of DMRS ports among the Y DMRS ports, or the TD-OCC length of the DMRS ports of the co-scheduled wireless communication devices in different CDM groups.

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

[0040] In some embodiments, if DMRS ports of a first category and some DMRS ports of a second category share the same DMRS port index, then 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 with L elements. L can be the number of OFDM symbols in an OFDM symbol group. In some embodiments, if the first DMRS table includes Y DMRS ports of a Physical Uplink Shared Channel (PUSCH), then there is no indication from the wireless communication node for the category of DMRS ports with the same DMRS port index. In some embodiments, if the first DMRS table includes Y DMRS ports of a Physical Downlink Shared Channel (PDSCH), then the first DMRS parameter includes an indication for the category of DMRS ports with the same DMRS port index. In some embodiments, if the first DMRS table includes Y DMRS ports of a PDSCH, then there is an indication from the wireless communication node for the category of DMRS ports with the same DMRS port index. In some embodiments, the category of DMRS ports with the same DMRS port index is determined by the total number of DMRS OFDM symbol groups for a channel at a transmission time.

[0041] In some embodiments, the indication for indicating the category of DMRS ports having the same DMRS port index includes at least one of the following: an indication for indicating the number of DMRS OFDM symbol groups of DMRS ports having the same DMRS port index, an indication for indicating whether the number of DMRS OFDM symbol groups of DMRS ports having the same DMRS port index is greater than 1, or an indication for indicating the length of the TD-OCC of DMRS ports having the same DMRS port index.

[0042] In some embodiments, at least two categories of DMRS ports include a first category DMRS port and a second category DMRS port. In some embodiments, 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. X can be an integer value greater than 1. In some embodiments, if the first category DMRS port corresponds to X OFDM symbol groups, and the second category DMRS port corresponds to different TD-OCCs across X OFDM symbol groups, then the first category DMRS port corresponds to the same TD-OCC across X OFDM symbol groups. In some embodiments, 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 an OFDM symbol group.

[0043] In some embodiments, the wireless communication device according to To determine the sequence of DMRS ports of at least two classes, where k = 4*n + 2*k′ + Δ, or k = 6*n + k′ + Δ, where k is the index of the subcarrier; Where l is the OFDM symbol of DMRS port p, l′ is the index of an OFDM symbol in an OFDM symbol group, and L is the number of symbols in an OFDM symbol group; k′ = 0 or 1 is an intermediate parameter used to determine the index of the DMRS subcarrier k; n includes non-negative integer values; w f (k′), w t (l′) and Δ are provided by a defined table, which includes the number of DMRS ports and w f (k′), w t The mapping between (l′) and Δ, where w f (k′) is FD-OCC, w t (l′) is TD-OCC, Δ is the RE offset associated with the CDM group; μ is a parameter related to the subcarrier spacing; and p is the number of DMRS ports, where for the first category of DMRS ports, w t(l′) comprises L elements and corresponds to each OFDM symbol group for a transmission timing of a channel, or w t (l′) consists of X*L elements, where X*L elements are X repetitions of the same vector of L elements, and w t (l′) corresponds to X OFDM symbol groups; for Category 2 DMRS ports, w t (l′) consists of X*L elements, which in turn consist of X distinct vectors, and each of the X distinct vectors consists of L elements, and w t (l′) corresponds to X OFDM symbol groups; or w t (l′) includes X*L elements and corresponds to X OFDM symbol groups.

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

[0045] In some embodiments, Category 3 DMRS ports and Category 4 DMRS ports share the same DMRS port index.

[0046] In some embodiments, the category of DMRS ports with the same DMRS port index is determined by the total number of DMRS OFDM symbol groups for a channel at a given transmission time. Categories include a third category and a fourth category.

[0047] In some embodiments, the category or first indication of the DMRS port includes at least one of the following: the number of DMRS OFDM symbol groups of DMRS ports having the same DMRS port index; an indication for indicating whether the number of DMRS OFDM symbol groups of DMRS ports having the same DMRS port index is greater than 1; or the length of the TD-OCC of the DMRS port having the same DMRS port index.

[0048] In some embodiments, a wireless communication node sends first information to a wireless communication device for determining a first demodulation reference signal (DMRS) table. In some embodiments, the wireless communication node sends values ​​of fields in signaling to the wireless communication device. In some embodiments, the values ​​of the fields are used by the wireless communication device to determine first DMRS parameters based on the first DMRS table and the values ​​of the fields. In some embodiments, the first DMRS table includes a mapping between the values ​​of the fields in the signaling and the values ​​of the first DMRS parameters, and each value in the fields is associated with a corresponding value in the values ​​of the first DMRS parameters. In some embodiments, the first DMRS table includes first DMRS parameters for at least two categories of DMRS ports, and the different categories of the at least two categories of DMRS ports correspond to at least one of the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a Time Domain Orthogonal Covering Code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRS OFDM symbols in a DMRS OFDM symbol group of a TD-OCC, or a different relationship between vectors of a TD-OCC. In some embodiments, each DMRS OFDM symbol group in the DMRS OFDM symbol group 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, wherein 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 DMRS OFDM symbol group 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 according to To determine the sequence of DMRS ports of at least two classes, where k = 4*n + 2*k′ + Δ, or k = 6*n + k′ + Δ, where k is the index of the subcarrier; Where l is the OFDM symbol of DMRS port p, l′ is the index of an OFDM symbol in an OFDM symbol group, and L is the number of symbols in an OFDM symbol group; k′ = 0 or 1 is an intermediate parameter used to determine the index of the DMRS subcarrier k; n includes non-negative integer values; w f (k′), wt(r), and Δ are provided by a defined table, which includes the number of DMRS ports and wf (k′), w t The mapping between (l′) and Δ, where w f (k′) is FD-OCC, w t (l′) is 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, where for Category 2 DMRS ports, w t (l′) includes X*L elements corresponding to X OFDM symbol groups; or for Category II DMRS ports, w t (l′) includes X*L elements, each element comprising X distinct vectors, and each of the X distinct vectors comprises L elements corresponding to one of the X OFDM symbol groups.

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

[0052] In some embodiments, Category 3 DMRS ports and Category 4 DMRS ports share the same DMRS port index.

[0053] 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 for a transmission timing of a channel, wherein the categories include a third category and a fourth category.

[0054] In some embodiments, for DMRS type I and the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 1, a CDM group includes up to 4 DMRS ports, and there are two CDM groups including up to 8 DMRS ports. In some embodiments, for DMRS type I and the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 2, a CDM group includes up to 8 DMRS ports, and there are two CDM groups including up to 16 DMRS ports. In some embodiments, for DMRS type II and the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 1, a CDM group includes up to 4 DMRS ports, and there are three CDM groups including up to 12 DMRS ports. In some embodiments, for DMRS type II and the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 2, a CDM group includes up to 8 DMRS ports, and there are three CDM groups including up to 24 DMRS ports. In some embodiments, for DMRS type I and the case where the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 1, there are 8 DMRS ports {0-3, 8-11}, CDM group 0 includes 4 DMRS ports {0, 1, 8, 9}, and CDM group 1 includes 4 DMRS ports {2, 3, 10, 11}. For DMRS type I and the case where the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 2, there are 16 DMRS ports {0-15}, CDM group 0 includes 8 DMRS ports {0, 1, 8, 9, 4, 5, 12, 13}, and CDM group 1 includes 8 DMRS ports {2, 3, 10, 11, 6, 7, 14, 15}. For DMRS type II and the case where the number of DMRS OFDM symbols in a DMRS OFDM symbol group is 1, there are 12 DMRS ports {0-5, 12-17}. CDM group 0 includes 4 DMRS ports {0,1,12,13}, CDM group 1 includes 4 DMRS ports {2,3,14,15}, and CDM group 3 includes 4 DMRS ports {4,5,16,17}. In some embodiments, for DMRS type II and the number of DMRSOFDM symbols in a DMRS OFDM symbol group is 2, there are 24 DMRS ports {0-23}, CDM group 0 includes 8 DMRS ports {0,1,12,13,6,7,18,19}, CDM group 1 includes 8 DMRS ports {2,3,14,15,8,9,20,21}, and CDM group 3 includes 4 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 the DMRS ports in DMRS ports {0-7} is determined by an indication in signaling. In some embodiments, for DMRS type II, X for the DMRS ports in DMRS ports {0-11} is determined by an indication 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 the DMRS ports in DMRS ports {8-15} is determined by the total number of DMRS OFDM symbol groups for a transmission timing.

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

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

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

[0059] In one aspect, a wireless communication node can 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, the maximum number of OFDM symbols in a DMRS OFDM symbol group, second DMRS parameters, the total number of OFDM symbol groups included in a transmission event, or the number of DMRS ports. Based on the first information, the wireless communication device can determine a first DMRS table. In another 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 Media Access Control Unit (MAC-CE) signaling. Based on the values ​​of fields in the first information, the wireless communication device can determine the first DMRS parameters according to the first DMRS table and the field values.

[0060] In some embodiments, the first DMRS table includes a mapping between the values ​​of signaling fields and the values ​​of first DMRS parameters, and each value of the field is associated with a corresponding value in the first DMRS parameter values. The first DMRS table includes first DMRS parameters, i.e., at least two categories of DMRS ports. In some embodiments, the different categories of the at least two categories of DMRS ports correspond to at least one of the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a Time-Domain Orthogonal Covering Code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRS OFDM symbols in a DMRSOFDM symbol group of a TD-OCC, or a different relationship between vectors of a TD-OCC. Each of the DMRSOFDM symbol groups may include one or more consecutive OFDM symbols.

[0061] In one aspect, the DMRS table disclosed herein indicates that a larger number of DMRS ports can be supported. In another aspect, the DMRS table includes DMRS parameters for TD-OCCs with different numbers of DMRS OFDM symbol groups, representing more than one category of DMRS ports. Each DMRS OFDM symbol group can include one or more consecutive DMRS OFDM symbols. DMRS OFDM symbols in different DMRS OFDM symbol groups are not consecutive. By allowing the TD-OCC to correspond to more than one DMRS OFDM symbol group, the number of supported DMRS ports can be increased because new DMRS ports can be co-scheduled with older UEs without interfering with the channel transmission of older UEs. Furthermore, a DMRS table can include more than one category of DMRS ports to increase scheduling flexibility. The gNB can dynamically switch between different categories of DMRS ports and schedule older and newer UEs as needed. DMRS port indices can be shared with different categories of DMRS ports to reduce signaling overhead while supporting or allowing scheduling flexibility. Some parameters can be considered to obtain the DMRS ports of co-scheduled UEs. Therefore, the UE can obtain more interference estimates from the co-scheduled UE, while allowing more DMRS ports. By allowing a larger number of DMRS ports, the wireless communication node can communicate with a larger number of wireless communication devices, and more layers of MIMO transmission can be allowed, thereby improving the spectral efficiency of communication. Attached Figure Description

[0062] Various exemplary embodiments of this solution are described in detail below with reference to the accompanying drawings. The drawings are provided for illustrative purposes only and depict only exemplary embodiments of the solution to aid the reader's understanding. Therefore, the drawings should not be considered as limitations on the breadth, scope, or applicability of the solution. It should be noted that these drawings are not necessarily drawn to scale for clarity and ease of explanation.

[0063] Figure 1 An example cellular communication network in which the techniques disclosed herein can be implemented according to embodiments of the present disclosure is shown;

[0064] Figure 2 Block diagrams of example base stations and user equipment devices according to some embodiments of the present disclosure are shown;

[0065] Figure 3 Two code division multiplexing (CDM) groups for demodulation reference signal (DMRS) type I are shown according to some embodiments of the present disclosure, and one TD-OCC corresponds to two DMRS OFDM groups, each of the two DMRS OFDM groups including one DMRS OFDM symbol;

[0066] Figure 4 The present disclosure illustrates three CDM groups for DMRS Type II according to some embodiments, and one TD-OCC corresponds to two DMRS OFDM groups, each of the two DMRS OFDM groups including a DMRSOFDM symbol; and

[0067] Figure 5 A flowchart illustrating an example method for communication based on a DMRS port indication according to an embodiment of the present disclosure is shown. Detailed Implementation

[0068] 1. Mobile communication technology and environment

[0069] Figure 1An example wireless communication network and / or system 100 according to embodiments of this disclosure is illustrated, in which the technologies disclosed herein may be implemented. In the following discussion, 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 an example network 100 includes base station 102 (hereinafter referred to as "BS102"; also called a wireless communication node) and user equipment device 104 (hereinafter referred to as "UE 104"; also called a wireless communication device) that can communicate with each other via communication link 110 (e.g., a wireless communication channel), and a cluster of cells 126, 130, 132, 134, 136, 138, and 140 covering a geographic area 101. Figure 1 In this context, BS102 and UE104 are contained within the respective geographical boundaries of cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating with its allocated bandwidth to provide sufficient wireless coverage to its intended users.

[0070] For example, BS102 can operate with the allocated channel transmission bandwidth to provide sufficient coverage to UE 104. BS102 and UE 104 can communicate via downlink radio frame 118 and uplink radio frame 124, respectively. Each radio frame 118 / 124 can be further divided into subframes 120 / 127, which may include data symbols 122 / 128. In this disclosure, BS102 and UE 104 are described herein as non-limiting examples of "communication nodes" that can generally practice the methods disclosed herein. According to various embodiments of this solution, such communication nodes can be capable of wireless and / or wired communication.

[0071] Figure 2 A block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) according to some embodiments of this solution is shown. System 200 may include components and elements configured to support known or conventional operating characteristics that do not need to be described in detail herein. In one illustrative embodiment, system 200 may be used in, for example... Figure 1 In wireless communication environments such as 100, data symbols are transmitted (e.g., transmitted and received), as described above.

[0072] System 200 typically includes a base station 202 (hereinafter referred to as "BS202") and a user equipment device 204 (hereinafter referred to as "UE204"). BS202 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 module being coupled and interconnected with each other as needed via a data communication bus 220. UE204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with each other as needed via a data communication bus 240. BS202 communicates with UE204 via a communication link 250, which can be any wireless channel or other medium suitable for data transmission as described herein.

[0073] As those skilled in the art will understand, system 200 may also include Figure 2 Any number of other modules besides those shown. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in conjunction with the embodiments disclosed herein can be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, the various illustrative components, blocks, modules, circuits, and steps are generally described according to their functionality. Whether such functionality is implemented in hardware, firmware, or software can depend on the specific application and design constraints imposed on the system as a whole. Those skilled in the art can implement such functionality in a suitable manner for each specific application, but such implementation decisions should not be construed as limiting the scope of this disclosure.

[0074] According to some embodiments, UE transceiver 230 may be referred to herein as "uplink" transceiver 230. Transceiver 230 includes a radio frequency (RF) transmitter and an RF receiver, each of which includes circuitry coupled to antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in a time-duplex manner. Similarly, according to some embodiments, BS transceiver 210 may be referred to herein as "downlink" transceiver 210. Transceiver 210 includes an RF transmitter and an RF receiver, each of which includes circuitry coupled to antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to downlink antenna 212 in a time-duplex manner. The operation of the two transceiver modules 210 and 230 may be time-coordinated such that the uplink receiver circuitry is coupled to uplink antenna 232 for reception of transmissions made over wireless transmission link 250 while the downlink transmitter is coupled to downlink antenna 212. Conversely, the operation of the two transceivers 210 and 230 can be time-coordinated, such that the downlink receiver is coupled to the downlink antenna 212 for receiving transmissions made via the wireless transmission link 250 when the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is tight time synchronization with a minimum guard time between changes in duplex direction.

[0075] UE transceiver 230 and base transceiver 210 are configured to communicate via wireless data communication link 250 and cooperate with RF antenna arrangements 212 / 232 appropriately configured to support specific wireless communication protocols and modulation schemes. In some illustrative embodiments, UE transceiver 230 and base transceiver 210 are configured to support industry standards such as Long Term Evolution (LTE) and emerging 5G standards. However, it should be understood that this disclosure is not necessarily limited to application to specific standards and related protocols. Rather, UE transceiver 230 and base transceiver 210 may be configured to support alternative or additional wireless data communication protocols, including future standards or variations thereof.

[0076] According to various embodiments, for example, BS202 may be an evolved Node B (eNB), gNB, serving eNB, target eNB, femtocell, or picocell. In some embodiments, UE 204 may be embodied in various types of user equipment, such as mobile phones, smartphones, personal digital assistants (PDAs), tablets, laptops, wearable computing devices, etc. Processor modules 214 and 236 may be implemented or implemented using a general-purpose processor, content-addressable memory, digital signal processor, application-specific integrated circuit, 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. In this way, the processor may be implemented as a microprocessor, controller, microcontroller, state machine, etc. The 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 combined with a digital signal processor core, or any other such configuration.

[0077] Furthermore, the steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be directly embodied in hardware, firmware, software modules executed by processor modules 214 and 236 respectively, or in any practical combination thereof. Memory modules 216 and 234 can be implemented as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In this respect, memory modules 216 and 234 can 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 can also be integrated into their respective processor modules 214 and 236. In some embodiments, each of memory modules 216 and 234 may include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 214 and 236 respectively. Memory modules 216 and 234 may each include non-volatile memory for storing instructions to be executed by processor modules 214 and 236, respectively.

[0078] Network communication module 218 generally refers to the hardware, software, firmware, processing logic, and / or other components of base station 202 used to enable bidirectional communication between base station transceiver 210 and other network components and communication nodes configured to communicate with network base station 202. For example, network communication module 218 may be configured to support Internet or WiMAX services. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface, enabling base station transceiver 210 to communicate with conventional Ethernet-based computer networks. In this way, network communication module 218 may include a physical interface for connection to a computer network (e.g., a mobile switching center (MSC)). As used herein with respect to the specified operation or function, the terms "configured for," "configured to," and variations thereof mean a device, component, circuit, structure, machine, signal, etc., physically constructed, programmed, formatted, and / or arranged to perform the specified operation or function.

[0079] The Open Systems Interconnection (OSI) model (referred to herein as the "OSI 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 interconnect and communicate with other systems. The model is divided into seven sub-components or layers, each representing a conceptual set of services provided to the layers above and below it. The OSI model also defines logical networks and efficiently describes computer packet transmissions using different layer protocols. The OSI model may also be referred to as the seven-layer OSI model or the seven-layer model. In some embodiments, the first layer may be the physical layer. In some embodiments, the second layer may be the Media 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 the Non-Access Stratum (NAS) layer or the Internet Protocol (IP) layer, and the seventh layer is another layer.

[0080] The following description, with reference to the accompanying drawings, illustrates various exemplary embodiments of this solution to enable those skilled in the art to create and use it. As will be apparent to those skilled in the art, various changes or modifications can be made to the examples described herein after reading this disclosure without departing from the scope of this solution. Therefore, this solution is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, the specific order or hierarchy of steps in the methods disclosed herein is merely exemplary. Based on design preferences, the specific order or hierarchy of steps in the disclosed methods or processes can be rearranged while remaining within the scope of this solution. Therefore, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or actions in an exemplary order, and unless otherwise expressly stated, this solution is not limited to the specific order or hierarchy presented.

[0081] 2. Systems and methods for indicating and / or determining DMRS ports

[0082] More orthogonal DMRS ports allow for more layers of MIMO transmission. Improving the spectral efficiency of communication is crucial. How to increase the number of orthogonal DMRS ports is a problem that the following methods will address. In some systems (e.g., 5G New Radio (NR), Next Generation (NG) systems, 3GPP systems, and / or other systems), wireless communication devices (e.g., UEs) and wireless communication nodes (e.g., base stations) can communicate with each other based on 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 the DMRS type between Type I and Type II, the maximum number of OFDM symbols in a DMRS OFDM symbol group, second DMRS parameters, the total number of OFDM symbol groups included in a transmission timing, or the number of DMRS ports. Based on the first information, the wireless communication device can determine a first DMRS table. In another 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 Media Access Control-Control Unit (MAC-CE) signaling. Based on the values ​​of the fields in the first information, the wireless communication device can determine the first DMRS parameters according to the first DMRS table and the field values. The wireless communication device can then use the determined first DMRS parameters to receive or transmit a channel.

[0083] In some embodiments, the first DMRS table includes a mapping between the values ​​of signaling fields and the values ​​of first DMRS parameters, and each value of the field is associated with a corresponding value of the first DMRS parameters. The first DMRS table includes first DMRS parameters for at least two categories of DMRS ports. In some embodiments, the different categories of the at least two categories of DMRS ports correspond to at least one of the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a Time Domain Orthogonal Cover Code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRS OFDM symbols in a DMRS OFDM symbol group of a TD-OCC, or different relationships between vectors of a TD-OCC. Each of the DMRS OFDM symbol groups may include one or more consecutive OFDM symbols. Relationships between vectors of a TD-OCC may include: a TD-OCC including repeating vectors.

[0084] In one aspect, the DMRS table disclosed herein indicates that a larger number of DMRS ports can be supported. In another aspect, the DMRS table includes DMRS parameters for TD-OCCs with different numbers of DMRS OFDM symbol groups, representing more than one category of DMRS ports. Each DMRS OFDM symbol group can include one or more consecutive DMRS OFDM symbols. DMRS OFDM symbols in different DMRS OFDM symbol groups are not consecutive. By allowing the TD-OCC to correspond to more than one DMRS OFDM symbol group, the number of supported DMRS ports can be increased because new DMRS ports can be co-scheduled with older UEs without interfering with the channel transmission of older UEs. Furthermore, a DMRS table can include more than one category of DMRS ports to increase scheduling flexibility. The gNB can dynamically switch between different categories of DMRS ports and schedule older and newer UEs as needed. DMRS port indices can be shared with different categories of DMRS ports to reduce signaling overhead while supporting or allowing scheduling flexibility. Some parameters can be considered to obtain the DMRS ports of co-scheduled UEs. Therefore, the UE can obtain more interference estimates from the co-scheduled UE, while allowing more DMRS ports. By allowing a larger number of DMRS ports, the wireless communication node can communicate with a larger number of wireless communication devices, and more layers of MIMO transmission can be allowed, thereby improving the spectral efficiency of communication.

[0085] Figure 3Two code division multiplexing (CDM) groups for demodulation reference signal (DMRS) type I are shown according to some embodiments of the present disclosure, and one TD-OCC corresponds to two DMRS OFDM groups, each of the two DMRS OFDM groups including one DMRS OFDM symbol. Figure 4 Three CDM groups for DMRS Type II are shown according to some embodiments of the present disclosure, and one TD-OCC corresponds to two DMRS OFDM groups, each of the two DMRS OFDM groups including one DMRS OFDM symbol.

[0086] - Example 1.

[0087] For DMRS of the Physical Uplink Shared Channel (PUSCH), a DMRS table can include multiple categories of DMRS ports. These multiple categories of DMRS ports can correspond to different numbers of OFDM (symbol) groups in a TD-OCC. Each OFDM group (or each group of OFDM symbols) can include one or more consecutive OFDM symbols. For example, an OFDM group may include one OFDM symbol or two consecutive OFDM symbols. Different OFDM groups can include non-consecutive OFDM symbols. For example, the gap between two DMRS / OFDM symbol groups can be greater than 0.

[0088] The DMRS table can include a mapping between the values ​​of the DMRS bit fields in the DCI and the first DMRS parameter.

[0089] For example, a DMRS table includes Category 1 DMRS ports, which correspond to one OFDM group in a TD-OCC (e.g., the number of OFDM groups = 1). If an OFDM group includes one OFDM symbol, the Category 1 DMRS port can correspond to a TD-OCC of length 1. If an OFDM group includes two consecutive OFDM symbols, the Category 1 DMRS port can correspond to a TD-OCC of length 2. A DMRS table can also include Category 2 DMRS ports, which correspond to X OFDM groups, where X is greater than 1. For example, Category 2 DMRS ports can include Category 3 DMRS with X = 2. If a DMRS OFDM symbol group includes one OFDM symbol and X = 2, a Category 3 DMRS port can correspond to a TD-OCC of length 2. If an OFDM group includes two OFDM symbols and X = 2, a Category 3 DMRS port can correspond to a TD-OCC of length 4. For example, the length of a TD-OCC can be equal to the number of OFDM symbols in the X OFDM groups. In some implementations, all DMRS OFDM symbol groups include the same number of OFDM symbols, and the length of the TD-OCC can be equal to the number of OFDM symbols in a DMRS symbol group multiplied by X. In some implementations, the number of OFDM symbols in different DMRS symbol groups can be different.

[0090] like Figure 3 As shown, each DMRS OFDM symbol group can include one OFDM symbol. For a Category 1 DMRS port, the TD-OCC can have a length of 1. OFDM symbol n0 and OFDM symbol n1 can each / respectively correspond to a TD-OCC of length 1. In one aspect, in this case, the Category 1 DMRS port does not have a TD-OCC, because a TD-OCC of length 1 can be marked, named, or identified without TD-OCC encoding. For a Category 3 DMRS port and X=2, the TD-OCC can have a length of 2. A TD-OCC of length 2 can correspond to two DMRS OFDM symbol groups including OFDM symbol n0 and OFDM symbol n1.

[0091] If the UE is indicated to have a Category 3 DMRS port, the number of CDM groups without data can be 2 for DMRS Type I and 3 for DMRS Type II. DMRS Type I and DMRS Type II can be used to indicate the frequency domain pattern of the DMRS port. In one aspect, Figure 3 Corresponding to DMRS type I, and Figure 4 Corresponds to DMRS type II.

[0092] For a Category 1 DMRS port with a TD-OCC length of 1, the UE can obtain the sequence of DMRS ports according to the following equation (1).

[0093]

[0094] k = 4*n + 2*k' + △

[0095] k′=0,1;

[0096]

[0097] n = 0, 1...

[0098] l′=0,1 (1)

[0099] Where w f (k′), w t (l′) and Δ are given in Table 1. k is the subcarrier index. The reference point of k is subcarrier 0 in common resource block 0. l is the OFDM symbol of DMRS. It is the first symbol in every L consecutive OFDM symbols. For example, It can be the first symbol in each DMRS OFDM symbol group. It can be based on the high-level configuration, mapping type, and PUSCH duration of l0 as shown in Tables 2 and 3. d Table 2 applies when / if the maximum number of OFDM symbols in a DMRS OFDM symbol group is equal to 1. Table 3 applies when / if the maximum number of OFDM symbols in a DMRS OFDM symbol group is equal to 2. I0 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 function of pseudo-random sequence generation. v is the number of layers and the number of DMRS ports. p includes the DMRS ports indicated by the DCI and is 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.

[0100] The reference point of l and the position l0 of the first DM-RS symbol can depend on the mapping type. For PUSCH mapping type A, if frequency hopping is disabled, l can be defined or determined relative to the start of the slot; while if frequency hopping is enabled, l can be determined relative to the start of each hop, and l0 is given by the higher-layer parameter dmrs-TypeA-Position. For PUSCH mapping type B, if frequency hopping is disabled, l can be defined relative to the start of the scheduled PUSCH resource; while if frequency hopping is enabled, l can be defined relative to the start of each hop, and l0 = 0.

[0101] In one respect, the (multiple) positions of the DM-RS symbol are determined by... and duration l d Given. For example, if in-slot frequency hopping is not used, then l d This refers to the duration between the first and last OFDM symbols in a time slot used for PUSCH mapping type A, according to Tables 2 and 3. For example, if intra-slot frequency hopping is not used, then l d This refers to the duration of the scheduled PUSCH resources for PUSCH mapping type B, based on Tables 2 and 3. For example, if in-slot frequency hopping is used, then l d It is based on the duration of each jump in Table 4.

[0102] Table 1: Parameters of Category 1 DMRS Ports

[0103]

[0104] Table 2

[0105]

[0106] Table 3

[0107]

[0108] Table 4

[0109]

[0110] Time-domain OFDM position This can be based on one of Tables 2, 3, or 4. Table 2 is applicable when the number of OFDM symbols in a DMRS OFDM symbol group is equal to 1, and intra-slot frequency hopping is disabled. Table 3 is applicable when the number of OFDM symbols in a DMRS OFDM symbol group is equal to 2, and intra-slot frequency hopping is disabled. Table 4 is applicable when the number of OFDM symbols in a DMRS OFDM symbol group is equal to 1, and intra-slot frequency hopping is enabled.

[0111] For the third category of DMRS ports, the UE can assume the sequence of DMRS ports according to the following equation (2).

[0112]

[0113] k = 4*n + 2*k′ + △

[0114] k′=0,1;

[0115]

[0116] n = 0, 1...

[0117] l′=0,1

[0118]

[0119] Where w f (k′), w t (l′) and Δ are given in Table 5. l is based on Table 2. and The first TD-OCC corresponding to a length of Z Second Z equals X * the number of OFDM symbols in a DMRS OFDM symbol set. For example, if According to Table 2, it is determined to be {l0, 7}, then Corresponding to l0, such as Figure 3 and Figure 4 n0 in the example. Corresponding to 7, such as Figure 3 and Figure 4 n1 in the text. l′ corresponds to the first DMRS OFDM symbol group of a TD-OCC. The first symbol of the second DMRS OFDM symbol group corresponding to a TD-OCC. The first DMRS OFDM symbol group corresponding to a TD-OCC. This corresponds to a second DMRS OFDM symbol group of a TD-OCC. If According to Table 2, they are identified as {l0, 5, 8, 11}. The four DMRS OFDM groups correspond to two TD-OCCs of length 2. The OFDM symbol {l0, 5} corresponds to one TD-OCC, and the OFDM symbol {8, 11} corresponds to the other TD-OCC. For the TD-OCC of OFDM symbol {l0, 5}, and These refer to l0 and 5 respectively. For the TD-OCC of OFDM symbols {8, 11}, and These refer to 8 and 11 respectively. In equation (2), It is a TD-OCC l′ = 0, 1 for each DMRS OFDM symbol group. It is a TD-OCC l′ = 0, 1 for each DMRSOFDM symbol group.

[0120] Table 5

[0121]

[0122] Category 1 DMRS ports and Category 3 DMRS ports can be combined into a single table, Table 6. They all follow Table 6 and Equation (1) or Equation (2).

[0123] Category 1 DMRS ports 0-7 and Corresponding to the same w t (l′), Category 3 DMRS ports 8-15 span and Corresponding to different w t (l′).

[0124] Table 6

[0125]

[0126] In one aspect, as shown in Table 6, for DMRS ports 0–7, across a TD-OCC, the first DMRS OFDM symbol group and the second DMRS OFDM symbol group, w t (l′) are the same. The TD-OCC length for DMRS ports 0-7 can be 2 or 4. Which TD-OCC length to use for DMRS ports 0-7 can be determined by the gNB and can depend on the total layer allocated to one or more co-scheduled UEs when the gNB acquires channel estimates based on DMRS ports 0-7. If the gNB allocates at least one of DMRS ports 0-7 and DMRS ports 8-15 in the same CDM group for one or more UEs on the same PRB (Physical Resource Block), then the gNB can use a TD-OCC length of 4 to acquire the channel based on at least one of the DMRS ports 0-7. If the gNB allocates only DMRS ports 0-7 and no DMRS ports 8-15 in the same CDM group for one or more UEs on the same PRB (Physical Resource Block), then the gNB can use a TD-OCC length of 2 to acquire the channel based on at least one of the DMRS ports 0-7.

[0127] In some embodiments, each CDM group may include two FDM-OCCw f (k′) Multiplexes two orthogonal DMRS ports. Can have two CDM groups. One w t (l′) can have 4 orthogonal DMRS ports. Although it can have 4 orthogonal TD-OCCw... t (l′) Sixteen orthogonal DMRS ports are provided for Category 3 DMRS ports, but DMRS ports 8 through 15 can be identified, utilized, or allocated as Category 3 DMRS ports. DMRS ports 0-7 can be shared between Category 1 and Category 3 DMRS ports. The TD-OCC length of DMRS ports 0-7 can be considered as 4 or 2. The gNB can determine which TD-OCC length to use to acquire a channel based on DMRS ports 0-7. For example, if UE 1 is assigned DMRS port {0,1} and UE 1 has fewer than 7 co-scheduled UEs, the gNB can acquire or be allocated a channel from UE 1 at DMRS port {0,1} based on a TD-OCC of length 2. If UE 1 is assigned DMRS port {0,1} and UE 1 has more than 7 co-scheduled UEs, the gNB can acquire or be allocated a channel from UE 1 at DMRS port {0,1} based on a TD-OCC of length 4. For example, if UE 1 is assigned a DMRS port {0,1} and there are fewer than 4 co-scheduled UEs in the same CDM group, the gNB can obtain or be assigned a channel from UE 1 using DMRS port {0,1} based on a TD-OCC of length 2. If UE 1 is assigned a DMRS port {0,1} and there are more than 4 UEs in the same CDM group, the gNB can obtain or be assigned a channel from UE 1 using DMRS port {0,1} based on a TD-OCC of length 4.

[0128] For DMRS type II, the UE can obtain the sequence of DMRS ports according to the following equation (3).

[0129]

[0130] k = 6*n + k′ + △

[0131] k′=0,1;

[0132]

[0133] n = 0, 1...

[0134] j = 0, 1, ..., v-1

[0135] l′=0,1 (3)

[0136] Where w f (k′), w t (l′) and Δ are given in Table 7. l is based on one of Tables 2, 3, or 4. Category 1 DMRS ports may include DMRS ports 0–11, and Category 3 DMRS ports may include DMRS ports 12–23. Category 1 DMRS ports 0–7 may correspond to cross- and The same w t (l′), Category 3 DMRS ports 8-15 can correspond to cross- and The difference w t (l′). Each CDM group may include 2 FDM-OCCw t (k′) Multiplexed two orthogonal DMRS ports. For three CDM groups, one w t (l′) can have 6 orthogonal DMRS ports. Although it can have 4 orthogonal TD-OCCw... t (l′) 24 orthogonal DMRS ports are provided for Category 3 DMRS ports, but DMRS ports 12 to 23 can be determined, utilized, or assigned as Category 3 DMRS ports. DMRS ports 0-11 can be shared between Category 1 and Category 3 DMRS ports. The TD-OCC length of DMRS ports 0-11 can be considered as 4 or 2. Which TD-OCC length the gNB uses to acquire a channel based on DMRS ports 0-11 can be determined by the gNB and can depend on the total layer allocated to the UE. For example, if UE 1 is allocated DMRS ports {0,1} and UE 1 has fewer than 12 co-scheduled UEs, the gNB can acquire or be assigned a channel from UE 1 at DMRS ports {0,1} based on a TD-OCC length of 2. If UE 1 is assigned a DMRS port {0,1} and there are more than 12 co-scheduled UEs for UE 1, the gNB can obtain or be assigned a channel from UE 1 using DMRS port {0,1} based on a TD-OCC of length 4. For example, if UE 1 is assigned a DMRS port {0,1} and there are fewer than 4 co-scheduled UEs in the same CDM group, the gNB can obtain or be assigned a channel from UE 1 using DMRS port {0,1} based on a TD-OCC of length 2. If UE 1 is assigned a DMRS port {0,1} and there are more than 4 UEs in the same CDM group, the gNB can obtain or be assigned a channel from UE 1 using DMRS port {0,1} based on a TD-OCC of length 4.

[0137] Table 7

[0138]

[0139] In one respect, l′ can be obtained from Table 8. When the number of OFDM symbols in a DMRS OFDM symbol group is equal to 1, the value of l′ can include 0. When the number of OFDM symbols in a DMRS OFDM symbol group is equal to 2, the value of l′ can be 0 or 1. Table 8 also provides a mapping between the number of DMRS and the parameters.

[0140] When the number of DMRS OFDM symbols in a DMRS OFDM symbol group is equal to 1, the w values ​​for l′=1 in Tables 5 to 7 are... t (l′) can be ignored. The maximum number of consecutive OFDM symbols in a DMRS OFDM symbol group can be configured by the parameter max-length. If the maximum length is configured to 2, the actual number of consecutive OFDM symbols in a DMRS OFDM symbol group can be one of the values ​​{1,2} indicated by the DCI. As shown in Table 8, for Type I and single-symbol DMRS in a DMRS OFDM symbol group, DMRS ports {0,1,2,3,8,9,10,11} are supported because w t (l′) has an element corresponding to l′=0.

[0141] Table 8

[0142]

[0143] For PUSCH transmission, if the UE is configured with DMRS type I via RRC signaling / MAC-CE signaling, and the maximum number of OFDM symbols in a DMRS OFDM symbol group is 1, and the UE is indicated in DCI with Y (layer number) layers, where Y is a value belonging to either set {1,2,3,4} or set {1,2,3,4,5,6,7,8}, then the UE can be indicated in DCI with Y DMRS ports from DMRS ports {0-3,8,9,10,11}.

[0144] For PUSCH transmission, if the UE is configured with DMRS type II via RRC signaling / MAC-CE signaling, and the maximum number of OFDM symbols in a DMRS OFDM symbol group is 1, and the UE is indicated with 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}, then the UE can be indicated with Y DMRS ports from DMRS ports {0-5,12-17} via the DCI.

[0145] Specifically, for PUSCH transmission, if the UE is configured via RRC signaling / MAC-CE signaling, and the maximum number of OFDM symbols in a DMRSOFDM symbol group is 1, and for DMRS type I or type II, a DMRS table may exist, which includes a mapping between the values ​​of the DMRS bit field in the DCI and a first DMRS parameter. The first DMRS parameter may include the number of CDM groups without data, and Y DMRS ports from type I DMRS ports {0-3,8,9,10,11} or from type II DMRS ports {0-5,12-17}. The UE can obtain the power offset between the DMRS and PUSCH based on the number of CDM groups without data. The UE can also obtain the REs where the PUSCH may not be mapped based on the number of CDM groups without data. The UE can determine the Y DMRS ports and the number of CDM groups without data based on the DMRS mapping and the values ​​of the DMRS bit field indicated in the DCI. Each Y may correspond to a DMRS mapping table. Y can be determined by other fields in the DCI, such as the TPMI bit field or the SRI (SRS Resource Indication) field. If Y is indicated as 1 in the DCI, the DMRS table can be as shown in Table 9 or Table 10. In Table 9, when the UE is indicated to have a third-category DMRS port, the number of CDM groups without data can be 2. However, in Table 10, when the UE is indicated to have a third-category DMRS port in CDM group 1, the number of CDM groups without data can be 2. When the UE is indicated to have a third-category DMRS port in CDM group 0, the number of CDM groups without data can be either 1 or 2, where 1 and 2 can correspond to different values ​​in the table. The actual numbers from {1,2} can be indicated by the DCI, as shown by values ​​6-9 in Table 10. If Y is greater than 1, then for a value in a DMRS mapping table, Y DMRS ports can include DMRS ports of one category. Alternatively, if Y is greater than 1, then for a value in a DMRS mapping table, Y DMRS ports can include DMRS ports of two categories. A DMRS port of one value belonging to two categories can be in the same CDM group or in different CDM groups.

[0146] Table 9

[0147] value Number of (multiple) DMRS CDM groups without data (Multiple) DMRS ports 0 1 0 1 1 1 2 2 0 3 2 1 4 2 2 5 2 3 6 2 8 7 2 9 8 2 10 9 2 11 10-15 Reserved Reserved

[0148] Table 10

[0149] value Number of (multiple) DMRS CDM groups without data (Multiple) DMRS ports 0 1 0 1 1 1 2 2 0 3 2 1 4 2 2 5 2 3 6 2 8 7 2 9 8 1 8 9 1 9 10 2 10 11 2 11 12-15 Reserved Reserved

[0150] For PUSCH transmission, if the UE is configured with DMRS type I via RRC signaling / MAC-CE signaling, and the maximum number of symbols in a DMRS OFDM symbol group is 2, and the UE is indicated with Y layers in the DCI, where Y belongs to {1,2,3,4} or {1,2,3,4,5,6,7,8}, then the UE can be indicated with Y DMRS ports in the DMRS ports {0-15} via the DCI.

[0151] For PUSCH transmission, if the UE is configured with DMRS type II via RRC signaling / MAC-CE signaling, and the maximum number of symbols in a DMRS OFDM symbol group is 2, and the UE is indicated with Y layers in the DCI, where Y belongs to {1,2,3,4} or {1,2,3,4,5,6,7,8}, then the UE can be indicated with Y DMRS ports in the DMRS ports {0-23} via the DCI.

[0152] Specifically, for PUSCH transmission, if the UE is configured via RRC signaling / MAC-CE signaling, and the maximum number of symbols in a DMR OFDM symbol group is 2, and for DMRS type I or type II, the DMRS table may include a mapping between the values ​​of the DMRS bit field of the DCI and the first DMRS parameter. The first DMRS parameter may include the number of CDM groups without data, Y DMRS ports from type I DMRS ports {0-15} or from type II DMRS ports {0-23}, and the number of consecutive OFDM symbols in a DMRS OFDM symbol group. Each Y may correspond to a DMRS mapping table. In the first implementation, if the Y DMRS ports include third-category DMRS ports, the number of CDM groups without data can be 2, and the number of consecutive OFDM symbols in a DMRS OFDM symbol group can be 2. In the second implementation, if the Y DMRS ports include third-category DMRS ports in CDM group 0 and do not include DMRS ports in CDM group 1, such as including one or more DMRS ports from {8,9,12,13}, then the number of CDM groups without data can be one from {1,2}, and the number of consecutive OFDM symbols in a DMRS OFDM symbol group can be 2. Different numbers of CDM groups without data can correspond to different values ​​in the DMRS table for the Y DMRS ports. In the third implementation, if the Y DMRS ports include third-category DMRS ports in CDM group 0 and correspond to the same w across l′=0 and l′=1... t(l′), and excluding the DMRS port in CDM group 1, the number of CDM groups without data can be one of {1,2}, and the number of consecutive OFDM symbols in a DMRS OFDM symbol group can be one of {1,2}. A value of the DMRS bit field corresponds to a number of CDM groups without data and a number of consecutive OFDM symbols in a DMRS OFDM symbol group. Therefore, for the second DMRS port in CDM group 0 and corresponding to the same w across l′=0 and l′=1 t (l′), and excluding the Y DMRS ports in CDM group 1, the DMRS table has four values, each of which corresponds to a combination of the number of CDM groups without data from {1,2} and the number of consecutive OFDM symbols in a 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}, then the DMRS table has the following four entries, as shown in Table 11. For including the second DMRS port in CDM group 0 and corresponding to different w across l′=0 and l′=1 t (l′), and does not include the same combination of Y DMRS ports of DMRS ports in CDM group 1, there are two values ​​in the DMRS table, each of the two values ​​corresponds to the number of CDM groups that do not have data from {1,2}, and the number of consecutive OFDM symbols in a DMRS OFDM symbol group can be a combination of 2.

[0153] Table 11

[0154]

[0155] The number of CDM groups without data shown in Table 9-11, 1, 2 and 3 can refer to the CDM groups {0}, {0,1} and {0,1,2} shown in Tables 1, 5 to 7, respectively.

[0156] In some implementations, Category 2 DMRS ports include Category 4 DMRS ports with X=3. A DMRS table includes Category 1 DMRS ports whose TD-OCC includes one DMRS OFDM symbol group, and Category 4 DMRS ports whose TD-OCC includes three DMRS OFDM symbol groups. For example, X is 3. For Category 4 DMRS ports of DMRS type I, the UE can assume the sequence of DMRS ports according to equation (1) or (4).

[0157]

[0158] k = 4*n + 2*k′ + Δ

[0159] k′=0,1;

[0160]

[0161] n = 0, 1...

[0162] l′=0,1

[0163]

[0164] Where w f (k′), w t (l′) and Δ are given in Table 12 or Table 13.

[0165] Table 12

[0166]

[0167] Table 13

[0168]

[0169] Specifically, for the fourth category of DMRS ports of DMRS type II, the UE can assume the sequence of DMRS ports according to equation (3) or (5).

[0170]

[0171] k = 6*n + k′ + Δ

[0172] k′=0,1;

[0173]

[0174] n = 0, 1...

[0175] j = 0, 1, ..., v-1

[0176] l′=0,1

[0177]

[0178] Where w f (k′), w t (l′) and Δ are given in Table 14 or Table 15.

[0179] Table 14

[0180]

[0181] Table 15

[0182]

[0183] As shown in Table 12-15, for Category 4 DMRS ports, a w can be determined. t (l′), where the other w t (l′) is [1, 1, 1]. Because it shares the same sequence with DMRS ports of the first category, some DMRS port numbers of the first category and some DMRS ports of the fourth category share the same DMRS port number because their sequences are the same. For example, DMRS ports 0-7 of type I and DMRS ports 0-11 of type II can share the same DMRS port number. The actual category of DMRS ports 0-7 of type I and DMRS ports 0-11 of type II depends on the gNB implementation and on the total layer allocated for the MU UE.

[0184] The DMRS table (which includes the mapping between the values ​​of the bit fields in the DCI and the first DMRS parameter) is selected by the DMRS type, the maximum value of OFDM symbols in a DMRS OFDM symbol group, a second parameter, the number of DMRS ports, and the total number of DMRS OFDM symbol groups in a PUSCH. The second parameter can be named the new table selection parameter or the maximum value of a DMRS OFDM symbol group in a TD-OCC. The second parameter is a 1-bit parameter. If the second parameter is configured (or configured to have a value of 1), the DMRS table can include at least one of the DMRS ports {8-15} for type I, and the DMRS table can include at least one of the DMRS ports {12-23} for type II. If the second parameter is configured (or configured to have a value of 1), the enabled DMRS ports can be as shown in Table 8; otherwise, the enabled DMRS ports can be as shown in Table 16.

[0185] The total number of DMRS OFDM symbol groups can be represented by the numbers shown in Table 2, Table 3, or Table 4. This is determined by [the specific method used]. For example, for DMRS type I, if the total number of DMRS OFDM symbol groups is {1, 2, 4}, then a DMRS table including first-category DMRS ports and third-category DMRS ports is selected for each number of DMRS ports. If the total number of DMRS OFDM symbol groups is {3}, then another DMRS table includes first-category DMRS ports, and a fourth-category DMRS is selected for one number of DMRS ports. In another implementation, for example, for DMRS type I and one number of DMRS ports, the total number of DMRS OFDM symbol groups {1}, {2, 4}, and {3} can be associated with a first DMRS table, a second DMRS table, and a third DMRS table, respectively. The first DMRS table can include first-category DMRS ports. The second DMRS table can include first-category DMRS ports and third-category DMRS ports. The third DMRS table can include first-category DMRS ports and fourth-category DMRS ports. When the number of OFDM symbols in an OFDM symbol group is 1, the total number of DMRS OFDM symbol groups can be equal to 3.

[0186] Table 16

[0187]

[0188] For example, select the DMRS table, as shown in Table 17.

[0189] Table 17

[0190]

[0191] In some implementations, the DMRS table, which includes the mapping between bit field values ​​in the DCI and the first DMRS parameter, is selected based on the DMRS type, the maximum value of OFDM symbols in a DMRS OFDM symbol group, the second parameter, and the number of DMRS ports. Therefore, a DMRS table can include first-category DMRS ports, third-category DMRS, and fourth-category DMRS. Thus, DMRS port numbers 8–15 can be replaced with 16–23 in Tables 12 and 13, and DMRS port numbers 12–17 can be replaced with 24–29 in Tables 14 and 15. An example of the mapping between DMRS port numbers and the second DMRS parameter is shown in Table 14. The DMRS parameter can include the DMRS type and the number of OFDM symbols in a DMRS OFDM symbol group.

[0192] For example, select a DMRS table as shown in Table 18. DMRS port numbers 8-15 for Type I (or DMRS port numbers 12-23 for Type II) can be shared between Category III and Category IV DMRS ports, as shown in Tables 5, 6, 12, and 13 for Type I, or as shown in Tables 7, 14, and 15. The category for DMRS ports 8-15 for Type I (or DMRS ports 12-23 for Type II) can depend on the total number of DMRS OFDM groups, which is based on the duration of the PUSCH. d The number of additional DMRS locations is determined by this. For example, for DMRS type I, if the UE is indicated to have DMRS ports 8 and 9, and the total number of DMRS OFDM symbol groups is 3, then DMRS ports 9 and 8 can be fourth-category DMRS ports, as shown in Table 4. If the UE is indicated to have DMRS ports 8 and 9, and the total number of DMRS OFDM symbol groups is 2 / 4, then DMRS ports 9 and 8 can be third-category DMRS ports, as shown in Table 5 or 6.

[0193] Table 18

[0194]

[0195] In the above implementation, the DMRS port is shared between Category 1 and Category 4 DMRS ports. The category of the DMRS port can depend on the total number of DMRS OFDM symbols at a transmission time of the PUSCH. In another implementation, if a DMRS table includes Category 1, Category 3, and Category 4 DMRS ports, then the DMRS port numbers between Category 3 and Category 4 are not shared and are different. In this case, DMRS port numbers 8–15 can be replaced with 16–23 in Tables 12 and 13, and DMRS port numbers 12–17 can be replaced with 24–29 in Tables 14 and 15. The mapping between DMRS port numbers and the second DMRS parameter is shown in Table 14. The DMRS parameter includes the DMRS type and the number of OFDM symbols in a DMRS OFDM symbol group.

[0196] Table 19

[0197]

[0198] Then, for DMRS type I and the maximum value of OFDM symbols in DMRS OFDM symbol 1, and Y DMRS ports, the DMRS table can indicate the Y DMRS ports in {0-3, 8-11, 16-19} indicated by the DCI. The DMRS table can include a mapping between the values ​​of the DMRS bit field in the DCI and a second DMRS parameter. The second DMRS parameter can include the number of CDM groups without data and the Y DMRS ports in {0-3, 8-11, 16-19}.

[0199] In some implementations, X DMRS OFDM symbol groups are in one time slot, where X can be one of {2, 3}. In another implementation, X DMRS OFDM symbol groups are in more than one time slot. More than one time slot can be consecutive time slots. More than one time slot can be consecutively available time slots. Available time slots can satisfy a certain condition. For example, the condition may include: no OFDM symbol scheduled for PUSCH is a downlink OFDM symbol. The condition may include: no OFDM symbol scheduled for PDSCH is an uplink OFDM symbol.

[0200] As shown in one of Tables 2-3, in some cases, the total number of DMRS OFDM symbol groups is 1. For example, for PUSCH mapping type A, when the duration is l d When it belongs to {4,5,6,7}, This includes l0. In this case, the gNB may not assign a Category 3 DMRS port to the UE.

[0201] The fourth category of DMRS ports can be used when the number of OFDM symbols in a DMRS OFDM symbol group is 1 and the total number of DMRS OFDM symbol groups is 1.

[0202] In some implementations, the UE receives a value from the DMRS table from the gNB in ​​signaling. The UE can then obtain a first parameter based on this value and the DMRS table. The signaling may include one of the following: DCI triggering PUSCH, RRC signaling configuring PUSCH, or MAC-CE activating PUSCH.

[0203] In some implementations, a DMRS table can include multiple categories of DMRS ports. Different categories of DMRS ports can correspond to different numbers of consecutive DMRS OFDM symbols in a DMRS OFDM symbol group. TD-OCCs of multiple categories of DMRS ports can correspond to the same number of DMRS OFDM symbol groups. For example, TD-OCCs of multiple categories of DMRS ports can correspond to a single DMRS OFDM symbol group. There can be a first category of DMRS ports with a TD-OCC corresponding to one consecutive DMRS OFDM symbol, a second category of DMRS ports with a TD-OCC corresponding to two consecutive DMRS OFDM symbols, and a third category of DMRS ports with a TD-OCC corresponding to four consecutive DMRS OFDM symbols.

[0204] Example 2

[0205] For PDSCH DMRS, a DMRS table can include multiple categories of DMRS ports. These multiple categories of DMRS ports correspond to different numbers of DMRS OFDM groups within a TD-OCC. Each OFDM group can include one or more consecutive OFDM symbols. For example, an OFDM group may include one or two consecutive OFDM symbols. Different OFDM groups can include non-consecutive OFDM symbols. In one respect, the gap between two DMRS OFDM symbol groups is greater than 0.

[0206] The DMRS table includes a mapping between the values ​​of the DMRS bit field in the DCI and the first DMRS parameter.

[0207] In some implementations, a DMRS table includes Category 1 DMRS ports and Category 3 DMRS ports.

[0208] For Category 1 DMRS ports and Type I, except In addition to Table 20 or Table 21, the UE can obtain the sequence of DMRS ports according to the following equation (1) and Table 1.

[0209] For the DMRS of PDSCH, the position l0 and reference point of the first DM-RS symbol in Equations 1 to 5 can depend on the mapping type. For PDSCH mapping type A: l is defined or determined relative to the start of the slot, and if the higher-layer parameter dmrs-TypeA-Position equals "pos3" and l0 = 2, then l0 = 3. For PDSCH mapping type B: l is defined relative to the start of scheduling the PDSCH resource, and l0 = 0.

[0210] The (multiple) positions of the DM-RS symbol can be determined by and duration l d Given. For example, for PDSCH mapping type A, l d This can be the duration between the first OFDM symbol of the time slot and the last OFDM symbol of the scheduled PDSCH resource in the time slot. For PDSCH mapping type B, l d This can be the duration of scheduling PDSCH resources. Table 20 is applicable to the case where the number of OFDM symbols in a DMRSOFDM symbol group is 1, and Table 21 is applicable to the case where the number of OFDM symbols in a DMRS OFDM symbol group is 2. In some embodiments, l1 is 11 or 12, depending on the higher-level configuration.

[0211] Table 20

[0212]

[0213] Table 21

[0214]

[0215] For Category 3 and Type IDMRS ports, the UE can obtain the sequence of DMRS ports according to the following equation (1) or (2) and Table 5, except... This can be based on Table 20 or Table 21.

[0216] Alternatively, for DMRS type I, Category I DMRS ports and Category III DMRS ports can be combined, following equation (1) and Table 6, except... For type I, it can be based on Table 20 or Table 21.

[0217] For Category 3 and DMRS Type II DMRS ports, the UE can obtain the sequence of DMRS ports according to the following equation (3) and Table 7, except... This can be based on Table 20 or Table 21.

[0218] In some implementations, a DMRS table includes Category 1 DMRS ports and Category 4 DMRS ports.

[0219] For Category 4 and DMRS type IDMRS ports, the UE can obtain the sequence of DMRS ports according to the following equation (4) and Table 12 or Table 13, except... This can be based on Table 20 or Table 21.

[0220] For Category 4 and DMRS Type II DMRS ports, the UE can obtain the sequence of DMRS ports according to the following equation (5) and Table 14 or Table 15, except... This can be based on Table 20 or Table 21.

[0221] In some implementations, a DMRS table includes Category 1 DMRS ports, Category 3 DMRS ports, and Category 4 DMRS ports. Category 3 and Category 4 ports can share the same DMRS ports. The category of a DMRS port can depend on the total number of DMRS OFDM symbol groups at a given time of PDSCH transmission.

[0222] The DMRS table can be selected via the DMRS type, the maximum value of OFDM symbols in a DMRS OFDM group, and a second parameter. The second parameter can be a 1-bit parameter. If the second parameter is configured (or configured to have a value of 1), the DMRS table includes first-category and third-category DMRS ports enabled, such as DMRS tables including at least one of the DMRS ports {8-15} for type I and DMRS tables including at least one of the DMRS ports {12-23} for type II. If the second parameter is not configured (or configured to have a value of 0), the DMRS table may include first-category DMRS ports enabled. If the second parameter is configured (or configured to have a value of 1), the mapping between the third DMRS parameter and the DMRS port can be as shown in Table 8; otherwise, the mapping between the third DMRS parameter and the DMRS port can be as shown in Table 16. In one aspect, the second parameter is used to enable or disable new DMRS ports. If the second parameter is configured (or configured to have a value of 1), a second category DMRS port can be enabled, such as a third or fourth category DMRS port; otherwise, only the first category DMRS can be enabled.

[0223] Unlike the DMRS table of PUSCH, the DMRS table of PDSCH can be selected without being based on the number of DMRS ports. A DMRS table of PDSCH can include different entries, including different numbers of DMRS ports.

[0224] For example, the DMRS table for the PDSCH can be selected as shown in Table 22. Tables m1 to m4 can correspond to the first category of DMRS ports. For tables m1 and m2, the first parameter includes the number of CDM groups without data and the DMRS port number. A DMRS table includes different entries, each including a different number of DMRS port numbers. The UE also obtains the number of DMRS ports and the value indicated in the DCI from the table. In table m1, Y DMRS ports are selected from DMRS ports 0 to 3, as shown in Table 1, and Y includes 1, 2, 3, and 4. When table m1 is selected, only one codeword can be enabled. In table m2, Y DMRS ports are selected from DMRS ports 0 to 5, as shown in Table 7, and Y includes 1, 2, 3, 4, 5, and 6.

[0225] For tables m3 and m4, the first parameter includes the number of CDM groups without data, the DMRS port number, and the number of symbols in a DMRSOFDM symbol group. In table m3, Y DMRS ports are selected from DMRS ports 0 to 7, as shown in Table 1, and Y includes 1, 2, 3, 4, 5, 6, 7, and 8. When table m1 is selected, a codeword can be enabled. In table m4, Y DMRS ports can be selected from DMRS ports 0 to 11, as shown in Table 7, and Y includes 1, 2, 3, 4, 5, 6, 7, and 8.

[0226] Table 22

[0227]

[0228] For Tables m5 and m7, the first parameter may include the number of CDM groups without data, the DMRS port number, and the number of DMRS ports. The first parameter may also include a third DMRS parameter, which may include at least one of the following: the length of the TD-OCC 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 between the first, third, and fourth categories. For example, DMRS ports 0-7 of type I (or DMRS ports 0-11 of type II) share the same DMRS ports between DMRS ports in the first category and DMRS ports in the second or fourth category. The length of the TD-OCC of DMRS ports 0-7 of type I (and the length of the TD-OCC of DMRS ports 0-11 of type II) may be further indicated in the DMRS table. The first DMRS set may include DMRS ports 0-7 of type I or DMRS ports 0-11 of type II. An example of Table m5 is shown in Table 23. As shown in Table 23, the third DMRS parameter can be named to indicate whether the number of DMRS OFDM symbol groups for a TD-OCC is greater than 1. If the third DMRS parameter is set to 1, there can be more than one DMRS OFDM symbol group for a TD-OCC. If the DMRS table includes only Category 1 and Category 3 DMRS ports, excluding Category 4 DMRS ports, and the third DMRS parameter is set to 1, then the number of DMRS OFDM symbol groups for a TD-OCC can be 2, and the length of the TD-OCC is equal to 2 multiplied by the number of symbols in a DMRS OFDM symbol. If the DMRS table includes Category 1, Category 3, and Category 4 DMRS ports, and the third DMRS parameter is set to 1, then the number of DMRS OFDM symbol groups for a TD-OCC can be 2 or 3, further determined by the total number of DMRS OFDM symbol groups in a transmission, and the length of the TD-OCC is equal to 2 or 3 multiplied by the number of symbols in a DMRS OFDM symbol. Alternatively, for PUSCH, Category 1 DMRS ports and Category 2 DMRS ports can share the same DMRS index, but for PDSCH, Category 1 DMRS ports and Category 2 DMRS ports can not share the same DMRS index and have different DMRS indices. The length of TD-OCC can be obtained from the index of the DMRS port.

[0229] In Table m5, Y DMRS ports can be selected from DMRS ports {0-3, 8-11}, as shown in Table 6, and Y can include 1, 2, 3, 4, 5, 6, 7, and 8. When selecting Table m5, up to two codewords can be enabled. In Table m6, Y DMRS ports can be selected from DMRS ports {0-5, 12-17}, as shown in Table 7, and Y can include 1, 2, 3, 4, 5, 6, 7, and 8.

[0230] In Table m7, Y DMRS ports can be selected from DMRS ports 0 to 15, as shown in Table 6, and Y can include 1, 2, 3, 4, 5, 6, 7, and 8. When Table m5 is selected, up to two codewords can be enabled. In Table m8, Y DMRS ports can be selected from DMRS ports 0 to 23, as shown in Table 7, and Y can include 1, 2, 3, 4, 5, 6, 7, and 8.

[0231] The UE can also determine the set of DMRS ports that includes potential co-scheduled UEs based on a third DMRS parameter. For example, for a codeword value of 0 as shown in Table 23, the UE can assume that a potential co-scheduled UE can be assigned DMRS port 1; however, for a codeword value of 12 as shown in Table 23, the UE can assume that potential co-scheduled UEs can be assigned DMRS ports 1, 8, and 9. The set of DMRS ports that includes potential co-scheduled UEs can be determined by the third parameter. If the third parameter is 0, the set can include first-category DMRS ports. If the third parameter is 1, the set can include third-category DMRS ports.

[0232] Table 23

[0233]

[0234] The first DMRS parameter may include a fourth DMRS parameter, which includes at least one of the following: the length of the TD-OCC of the DMRS port in each CDM group without data; the number of DMRS OFDM symbol groups included in a TD-OCC in each CDM group without data; the relationship between the lengths of the TD-OCCs of the DMRS ports in different CDM groups without data; or the relationship between the number of DMRS OFDM symbol groups included in a TD-OCC in different CDM groups without data. The UE can obtain the DMRS ports of potential co-scheduled UEs based on the fourth parameter. For example, for a codeword value 15 to 23 in Table 23, the set of DMRS ports of potential co-scheduled UEs in CDM group 1 may include DMRS ports of the first category in CDM group 1, such as DMRS ports {2,3}, or may include DMRS ports of the third category in CDM group 1, such as DMRS ports {2,3,10,11}. It can be further indicated by the fourth DMRS parameter. The length of the TD-OCC of the DMRS port is equal to the number of DMRS OFDM symbol groups included in a TD-OCC multiplied by the number of OFDM symbols in a DMRS OFDM symbol group.

[0235] 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 a codeword value of 15 to 23 in Table 23, the TD-OCC length of the set of DMRS ports of potential co-scheduled UEs in CDM group 1 can include DMRS ports of the third category in CDM group 1, such as DMRS ports {2,3,10,11}, because the length of the TD-OCC in CDM group 1 can be the same as the length of the TD-OCC in CDM group 0, i.e., the length of the TD-OCC is equal to 2.

[0236] For tables m6 and m8, the first parameter may include the number of CDM groups without data, the DMRS port number, and the number of symbols in an OFDM symbol group. The first DMRS parameter may also include a third DMRS parameter and / or a fourth DMRS parameter.

[0237] The second parameters for the uplink and downlink DMRS ports can be configured individually or jointly. When configured individually, there can be two independent configurations for the second parameters of the uplink and downlink DMRS ports, respectively.

[0238] In some implementations, a DMRS table can include multiple categories of DMRS ports. Different categories of DMRS ports can correspond to different numbers of consecutive DMRS OFDM symbols in a DMRS OFDM symbol group. TD-OCCs of multiple categories of DMRS ports can correspond to the same number of DMRS OFDM symbol groups. For example, TD-OCCs of multiple categories of DMRS ports can correspond to a single DMRS OFDM symbol group. It is possible to have: a first category DMRS port with a TD-OCC corresponding to one consecutive DMRS OFDM symbol, a second category DMRS port with a TD-OCC corresponding to two consecutive DMRS OFDM symbols, and a third category DMRS port with a TD-OCC corresponding to four consecutive DMRS OFDM symbols.

[0239] Figure 5 A flowchart of a method 500 for communicating based on a DMRS port indication based on a DMRS table, according to an embodiment of the present disclosure, is shown. Method 500 can be used in conjunction with the methods described herein. Figures 1-4 This can be implemented using any components and devices described in detail. In short, the wireless communication node can transmit first information (505) for the wireless communication device to determine the first DMRS table. The wireless communication device can receive the first information and determine the first DMRS table based on the first information (510). The wireless communication node can transmit signaling to the wireless communication device (515). The wireless communication device can receive signaling including the values ​​of fields (520). The wireless communication device can determine the first DMRS parameters based on the first DMRS table and the field values ​​(530). The wireless communication device can transmit signals with the communication node (540 and 545).

[0240] More specifically, the wireless communication node may transmit first information (505) for the wireless communication device to determine the first DMRS table. The first information may include at least one of the following: the DMRS type between type I and type II, the maximum number of OFDM symbols in a DMRS OFDM symbol group, a second DMRS parameter, the total number of OFDM symbol groups included in a transmission timing, or the number of DMRS ports.

[0241] The wireless communication device can receive first information and determine a first DMRS table (510) based on the first information. In one aspect, the wireless communication device stores multiple DMRS tables. Based on the first information, the wireless communication device can determine the first DMRS table. For example, the wireless communication device can determine the first DMRS table based on at least one of the following: the DMRS type between type I and type II, the maximum number of OFDM symbols in a DMRS OFDM symbol group, a second DMRS parameter, the total number of OFDM symbol groups included in a transmission timing, and the number of DMRS ports. In one aspect, the first DMRS table includes a mapping between the values ​​of signaling fields and the values ​​of first DMRS parameters. Each value of a field can be associated with a corresponding value in the values ​​of the first DMRS parameters. In one aspect, the first DMRS table includes first DMRS parameters having values ​​associated with at least two categories of DMRS ports. In one aspect, some values ​​of the first DMRS parameters are associated with one category. Other values ​​can be associated with multiple categories. The different categories of at least two DMRS ports can correspond to at least one of the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a time-domain orthogonal overlay code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRSOFDM symbols in a DMRS OFDM symbol group of a TD-OCC, or a different relationship between vectors of a TD-OCC. Each DMRS OFDM symbol group may include one or more consecutive OFDM symbols.

[0242] A wireless communication node may transmit signaling to a wireless communication device (515). Examples of signaling include: downlink control information (DCI) signaling, radio access control (RRC) signaling, or media access control and control unit (MAC-CE) signaling. A wireless communication device may receive signaling (520). Signaling may include one or more fields.

[0243] The wireless communication device can determine the first DMRS parameter (530) based on the first DMRS table and the value of the field. In some embodiments, the number of bits in the field is indicated by or determined based on the first DMRS information. Therefore, the wireless communication device can receive a signal and determine, detect, or identify the field based on the number of bits indicated by the first DMRS information. The wireless communication device can apply the value of the field to the first DMRS table as an index and determine, retrieve, or identify the first DMRS parameter stored in an entry of the first DMRS table associated with the index.

[0244] The wireless communication device can transmit signals to the communication node (540 and 545). For example, the wireless communication device can select, control, or configure a DMRS port according to a first DMRS parameter. Through the determined DMRS port, the wireless communication device and the wireless communication node can communicate with each other. For example, the wireless communication device uses the determined DMRS port to transmit signals on the PUSCH, or receives signals on the PDSCH according to the determined DMRS port and / or the determined first DMRS parameter. The wireless communication device can acquire information / DMRS ports of potential co-scheduled wireless communication devices to decode signals on the PDSCH according to the first DMRS parameter. For example, the wireless communication device can acquire / receive interference from potential co-scheduled wireless communication devices to decode signals on the PDSCH according to the determined first DMRS parameter.

[0245] 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 figures may depict exemplary architectures or configurations provided to enable those skilled in the art to understand exemplary features and functionality of the present solution. However, those skilled in the art will understand that the present solution is not limited to the exemplary architectures or configurations shown, but can be implemented using various alternative architectures and configurations. Furthermore, as those skilled in the art will understand, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of this disclosure should not be limited by any of the illustrative embodiments described above.

[0246] It should also be understood that any reference to elements in this document using names such as "first," "second," etc., generally does not restrict the number or order of these elements. Rather, these names may be used as a convenient means of distinguishing two or more elements or instances of a single element. Therefore, references to the first element and the second element do not imply that only two elements can be used, or that the first element must somehow precede the second element.

[0247] Furthermore, those skilled in the art will understand that information and signals can be represented using any of a variety of different methods and techniques. For example, data, instructions, commands, information, signals, bits, and symbols that may be referenced in the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0248] Those skilled in the art will further understand that any of the various illustrative logic blocks, modules, processors, devices, circuits, methods, and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., digital implementation, analog implementation, or a combination of both), firmware, various forms of program or design code in conjunction with instructions (which may be referred to herein as "software" or "software module"), or any combination of these technologies. To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally according to their functionality. Whether such functionality is implemented in hardware, firmware, software, or a combination of these technologies depends on the specific application and the design constraints imposed on the system as a whole. Those skilled in the art can implement the described functionality in various ways for each specific application, but such implementation decisions will not lead to a departure from the scope of this disclosure.

[0249] Furthermore, those skilled in the art will understand that the various illustrative logic blocks, modules, devices, components, and circuits described herein can be implemented within or executed by integrated circuits (ICs), which may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, or any combination thereof. Logic blocks, modules, and circuits may also include antennas and / or transceivers for communication 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. The 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 combined with a DSP core, or any other suitable configuration for performing the functions described herein.

[0250] If implemented in software, these functions can be stored as one or more instructions or code on a computer-readable medium. Therefore, the steps of the methods or algorithms disclosed herein can be implemented as software stored on a computer-readable medium. A computer-readable medium includes both computer storage media and communication media, encompassing any medium capable of transferring a computer program or code from one place to another. A storage medium can be any available medium that is accessible to a computer. By way of example and not limitation, such a computer-readable medium 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 is accessible to a computer.

[0251] In this document, the term "module" as used herein refers to software, firmware, hardware, and any combination of these elements used to perform the related functions described herein. Furthermore, for the purposes of discussion, various modules are described as discrete modules; however, as will be apparent to those skilled in the art, two or more modules may be combined to form a single module that performs the associated functions according to embodiments of the present solution.

[0252] Furthermore, in embodiments of this solution, memory or other storage devices and communication components may be employed. It should be understood that, for clarity, embodiments of this solution have been described above with reference to different functional units and processors. However, it will be apparent that any suitable functional distribution among different functional units, processing logic elements, or domains can be used without departing from this solution. For example, functions illustrated as being performed by a separate processing logic element or controller may be performed by the same processing logic element or controller. Therefore, references to specific functional units are merely references to the appropriate manner of providing the described functions and do not represent a strict logical or physical structure or organization.

[0253] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the embodiments shown herein, but should be accorded the widest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. A method for wireless communication, comprising: The first demodulation reference signal (DMRS) table is determined by the wireless communication device based on the first information from the wireless communication node; The wireless communication device receives the values ​​of fields in the signaling from the wireless communication node; as well as The wireless communication device determines the first DMRS parameter based on the first DMRS table and the values ​​of the fields. The first DMRS table includes a mapping between the values ​​of the fields in the signaling and the values ​​of the first DMRS parameters, and each value in the field is associated with a corresponding value in 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 the different categories of the at least two categories of DMRS ports correspond to at least one of the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a time-domain orthogonal overlay code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRS OFDM symbols in a DMRS OFDM symbol group of a TD-OCC, or different relationships between vectors of a TD-OCC. Each DMRS OFDM symbol group in the DMRS OFDM symbol group includes one or more consecutive OFDM symbols.

2. The method of claim 1, wherein at least one of the following: There is a gap between symbols in two adjacent DMRS OFDM symbol groups, and the gap is greater than zero OFDM symbols; or OFDM symbols in different DMRS OFDM symbol groups are discontinuous relative to each other.

3. The method of claim 1, wherein 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 of DMRS ports corresponds to one DMRS OFDM symbol group, and the second category of DMRS ports corresponds to X DMRS OFDM symbol groups, where X is an integer value greater than 1.

4. The method of claim 1, wherein if the wireless communication device is configured with DMRS type I and the maximum number of OFDM symbols in an OFDM symbol group is 1, the wireless communication device determines Y DMRS ports selected from DMRS ports {0-3, 8, 9, 10, 11} based on the value of the first DMRS parameter, where Y is a positive integer value.

5. The method of claim 1, wherein 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 determines Y DMRS ports selected from DMRS ports {0-5, 12-17} based on the value of the first DMRS parameter, where Y is a positive integer.

6. The method of claim 1, wherein if the wireless communication device is configured with DMRS type I and the maximum number of OFDM symbols in an OFDM symbol group is 2, the wireless communication device determines Y DMRS ports selected from DMRS ports {0-15} based on the value of the first DMRS parameter, where Y is a positive integer.

7. The method of claim 1, wherein 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 determines Y DMRS ports selected from DMRS ports {0-23} based on the value of the first DMRS parameter, where Y is a positive integer.

8. The method of claim 4, wherein if the Y DMRS ports include at least one of DMRS ports 8-15, and the number of CDM groups without data is a first maximum value, then the first DMRS parameter includes the number of CDM groups without data and the Y DMRS ports.

9. The method of claim 6, wherein if the Y DMRS ports include at least one DMRS port among DMRS ports 8-15, and the number of DMRS ODMM symbols in a DMRS OFDM symbol group is a second maximum value, then the first DMRS parameter includes the number of DMRS OFDM symbols in a DMRS OFDM symbol group and the Y DMRS ports.

10. The method of claim 4, wherein: DMRS ports 0-7 are Category 1 DMRS ports, and DMRS ports 8-15 are Category 2 DMRS ports; or DMRS ports 0-7 are first-category DMRS ports and second-category DMRS ports, and DMRS ports 8-15 are second-category DMRS ports, wherein the first-category DMRS ports in DMRS ports 0-7 and the second-category DMRS ports in DMRS ports 0-7 have the same DMRS port index 0-7.

11. The method of claim 5, wherein if the Y DMRS ports include at least one of DMRS ports 12-23, and the number of CDM groups without data is a first maximum value, then the first DMRS parameter includes the number of CDM groups without data and the Y DMRS ports.

12. The method of claim 7, wherein if the Y DMRS ports include at least one of DMRS ports 12-23, and the number of DMRS OFDM symbols in a DMRS OFDM symbol group is a second maximum value, then the first DMRS parameter includes the number of DMRS OFDM symbols in a DMRS OFDM symbol group and the Y DMRS ports.

13. The method of claim 5, wherein: DMRS ports 0-11 are Category 1 DMRS ports, and DMRS ports 12-23 are Category 2 DMRS ports; or DMRS ports 0-11 are first-category DMRS ports and second-category DMRS ports, and DMRS ports 8-15 are second-category DMRS ports, wherein the first-category DMRS ports and the second-category DMRS ports in DMRS ports 0-11 have the same DMRS port index 0-11.

14. The method of claim 1, wherein the first DMRS parameter includes Y DMRS ports and the number of CDM groups without data, wherein at least one of the following: The number of CDM groups without data is determined based on at least one of the following: the relationship between the categories of the Y DMRS ports or the elements of a TD-OCC; or The value of the first DMRS parameter in the first DMRS table does not include the first value of the number of CDM groups without data and the second category of DMRS ports.

15. The method of claim 14, wherein at least one of the following: The number of CDM groups without data is further determined based on at least one index of the CDM groups including the Y DMRS ports; or The value of the first DMRS parameter in the first DMRS table does not include the first value of the number of CDM groups without data and the second category of DMRS ports.

16. The method of claim 14, wherein if the Y DMRS ports include at least one DMRS port of the second category, the number of CDM groups without data is a first maximum value.

17. The method of claim 1, wherein the first DMRS table includes the first DMRS parameters of the at least two categories of DMRS ports, and satisfies at least one of the following: The first DMRS parameter includes Y DMRS ports, and the Y DMRS ports associated with a 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 a 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 at least two categories of DMRS ports are associated with different values ​​of the field.

18. The method of claim 17, wherein the Y DMRS ports associated with a value of the field belong to more than one of the at least two categories of DMRS ports, and satisfy at least one of the following: The DMRS ports of more than one of the at least two categories are in different CDM groups; DMRS ports in a CDM group and from the 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 signaling, and also belong to different categories of DMRS ports for different channels and different signaling; The Y DMRS ports belong to a category of DMRS ports for a channel and a signaling message, and the category of the Y DMRS ports for the channel depends on a first indication; or The Y DMRS ports belong to a category of DMRS ports for a channel and a signaling, and the category of the Y DMRS ports depends on the total number of DMRS OFDM symbol groups for a transmission timing of a channel.

19. The method of claim 1, wherein the first DRMS ​​parameter includes the number of consecutive OFDM symbols in an orthogonal frequency division multiplexing (OFDM) symbol group and Y DMRS ports; At least one of the following: The number of consecutive OFDM symbols in an OFDM symbol group is determined by the category of the Y DMRS ports; The number of consecutive OFDM symbols in the OFDM symbol group is one of 1, 2, or 4; or The value of the first DMRS parameter in the first DMRS table does not include: The first value of the number of consecutive OFDM symbols in a group of OFDM symbols, and the second category of DMRS ports.

20. The method of claim 19, wherein: If the Y DMRS ports include DMRS ports of the second category, then the number of CDM groups without data is the first maximum value, and the number of consecutive OFDM symbols in the OFDM symbol group is the second maximum value.

21. The method according to any one of claims 8, 11, 16 or 20, wherein: For a Type I DMRS port, the first maximum value is 2; or For a Type II DMRS port, the first maximum value is 3.

22. The method according to any one of claims 9, 12 or 20, wherein the second maximum value is 2 or 4.

23. The method according to any one of claims 1, 14, or 20, wherein the first DMRS parameter comprises: The number of consecutive OFDM symbols in an Orthogonal Frequency Division Multiplexing (OFDM) symbol group, Y DMRS ports, and the number of consecutive OFDM symbols in the OFDM symbol group. If the Y DMRS ports include a second category DMRS port corresponding to the same element of the TD-OCC of multiple DMRS OFDM symbols across a DMRS OFDM symbol group, and do not include DMRS ports in CDM group 1, then the number of CDM groups without data is 1 or 2, and the number of consecutive OFDM symbols in the OFDM symbol group is 1 or 2.

24. The method according to claim 14 or 20, wherein the first DMRS parameter includes the number of consecutive OFDM symbols in an orthogonal frequency division multiplexing (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 the second DMRS port in CDM group 0 but excluding the DMRS port in CDM group 1, the first DMRS table contains four values, each of which corresponds to a specific combination among the four combinations: The number of CDM groups without data is 1 or 2, and the number of consecutive OFDM symbols in a single OFDM symbol group is 1 or 2. The second category of DMRS ports corresponds to the same element of the TD-OCC for multiple DMRS OFDM symbols across a DMRS OFDM symbol group.

25. The method of claim 14 or 20, wherein the first DMRS parameter includes the number of consecutive OFDM symbols in an orthogonal frequency division multiplexing (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 the second DMRS port in CDM group 0 and excluding the DMRS port in CDM group 1, there are two values ​​in the first DMRS table, each of which corresponds to a specific combination of the two combinations, wherein: The number of CDM groups without data is 1 or 2, and the number of consecutive OFDM symbols in a given OFDM symbol group is 2. The second category of DMRS ports corresponds to the same element of the TD-OCC for multiple DMRS OFDM symbols across a DMRS OFDM symbol group.

26. The method of claim 1, wherein the signaling includes one of the following: downlink control information (DCI) signaling, radio access control (RRC) signaling, or media access control unit (MAC-CE) signaling.

27. The method of claim 1, wherein the first DMRS parameter includes the number of code division multiplexing (CDM) groups without data and Y DMRS ports, and If the maximum number of OFDM symbols in a DMRS OFDM symbol group is greater than 1, then the first DMRS parameter also includes the number of consecutive OFDM symbols in an OFDM symbol group.

28. The method of claim 27, wherein when the Y DMRS ports are DMRS ports of the Physical Downlink Shared Channel (PDSCH), the first DMRS parameter further includes a third parameter, the third parameter including at least one of the following: The categories of DMRS ports, the categories of DMRS ports in CDM groups without data, the relationship between the categories of multiple DMRS ports in different CDM groups without data, the length of the TD-OCC of the DMRS ports in the CDM groups without data, the length of the TD-OCC of the DMRS ports, or the length of the TD-OCC of the DMRS ports for each CDM group without data. The DMRS port or the plurality of DMRS ports originate from the Y DMRS ports of the channel of the wireless communication device, and / or the DMRS port or the plurality of DMRS ports include the DMRS ports of the wireless communication device that are potentially co-scheduled by the wireless communication device.

29. The method of claim 1, wherein at least one of the following: The number of bits in the field is determined by the first information; or The first DMRS table is selected from multiple tables based on the first information.

30. The method according to claim 1 or 29, wherein: The first information includes at least one of the following: the DMRS type between Type I and Type II, the maximum number of OFDM symbols in a DMRS OFDM symbol group, a second DMRS parameter, the total number of OFDM symbol groups included in a transmission event, or the number of DMRS ports. Different DMRS types correspond to different frequency domain patterns of the DMRS port.

31. The method of claim 30, comprising at least one of the following: The second DMRS parameter will indicate whether the second category DMRS port is enabled; The second DMRS parameter will indicate whether the DMRS port includes a second category of DMRS ports that are enabled; The second DMRS parameter is a single parameter; The second DMRS parameter is included in a third signaling, which includes at least one of the following: DCI signaling, MAC-CE signaling, or RRC signaling; or If the first DMRS table includes DMRS ports of the Physical Uplink Shared Channel (PUSCH), and the first information is used to select the first DMRS table and not to determine the number of bits in the field, then the first information includes the number of DMRS ports.

32. The method of claim 1, wherein the first DMRS parameter comprises Y DMRS ports, and the method further comprises: The wireless communication device determines at least one of the following based on the total number of OFDM symbol groups included in a transmission timing: the class of the DMRS ports among the Y DMRS ports, or the TD-OCC length of the DMRS ports of the co-scheduled wireless communication devices in different code division multiplexing (CDM) groups.

33. The method of claim 32, comprising: The wireless communication device determines at least one of the following based on the total number of OFDM symbol groups included in the transmission timing and the Y DMRS ports: the category of the DMRS ports among the Y DMRS ports, or the length of the TD-OCC of the DMRS ports of the co-scheduled wireless communication devices in the different CDM groups.

34. The method of claim 4, wherein Y is less than 5 or 9.

35. The method of claim 1, wherein at least one of the following: The DMRS ports of at least two categories are indexed together; The index of a DMRS port is determined by: first indexing across DMRS ports of category 1, then indexing across DMRS ports of category 2, or... The first category of DMRS ports and some second category DMRS ports share the same DMRS port index.

36. The method according to claim 1 or 35, wherein at least one of the following: 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 used for the Physical Uplink Shared Channel (PUSCH), then 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 used for the Physical Uplink Shared Channel (PUSCH), then 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, 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 DMRS table is used for the Physical Downlink Shared Channel (PDSCH), then the first DMRS port with the first TD-OCC and the second DMRS port with the second TD-OCC have different DMRS port indices; If a first DMRS port with a first TD-OCC and a second DMRS port with a second TD-OCC share the same DMRS port index, and the first DMRS table is used for the Physical Downlink Shared Channel (PDSCH), then the wireless communication device determines the TD-OCC of the DMRS port with the same DMRS port index. or If a first DMRS port with a first TD-OCC and a second DMRS port with a second TD-OCC share the same DMRS port index, and the first DMRS table is used for the Physical Downlink Shared Channel (PDSCH), then the wireless communication device determines the TD-OCC of the DMRS port with the same DMRS port index based on at least one of the following: the parameters included in the first DMRS parameters, or the total number of DMRS OFDM symbol groups for a transmission timing of a channel.

37. The method of claim 36, wherein at least one of the following: The second TD-OCC includes more than one repetition 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 first TD-OCC has 3 DMRS OFDM symbol groups and 4 DMRS OFDM symbol groups.

38. The method of claim 36, wherein the parameters included in the first DMRS parameter include at least one of the following: The number of DMRS OFDM symbol groups for the DMRS ports that have the same DMRS port index; An indication of whether the number of DMRS OFDM symbol groups for the DMRS port with the same DMRS port index is greater than 1; or The length of the TD-OCC for the DMRS ports that have the same DMRS port index.

39. The method of claim 10, wherein the at least two categories of DMRS ports include the first category of DMRS ports and the second category of DMRS ports. At least one of the following: The TD-OCC of the first category of DMRS ports corresponds to one OFDM symbol group, and the second category of DMRS ports corresponds to X OFDM symbol groups, where X is an integer value greater than 1; If the first category of DMRS ports corresponds to X OFDM symbol groups, and the second category of DMRS ports corresponds to different TD-OCCs across the X OFDM symbol groups, then the first category of DMRS ports corresponds to the same TD-OCC across the X OFDM symbol groups; or The length of the TD-OCC for the first type of DMRS port is L, and the length of the TD-OCC for the second type of DMRS port is X. L, where L is the number of OFDM symbols in an OFDM symbol group.

40. The method of claim 3, comprising: The wireless communication device determines the sequence of at least two categories of DMRS ports according to the following formula: ， in: ,or , where k is the index of the subcarrier; ， =0, 1, ..., L-1, where It is the OFDM symbol for DMRS port p. L is the index of an OFDM symbol in an OFDM symbol group, and L is the number of symbols in the OFDM symbol group. It is the first symbol in every L consecutive OFDM symbols; =0 or 1 is an intermediate parameter used to determine the index of the subcarrier k of the DMRS; n includes non-negative integer values; , , and Δ are provided by a defined table, which includes the number of DMRS ports and , The mapping between , and Δ, where It is FD-OCC. It is TD-OCC, and Δ is the RE offset associated with the CDM group; μ is a parameter related to the subcarrier spacing; and p is the number of DMRS ports. It is a symbol sequence Index symbols, For the first category of DMRS ports, the Each OFDM symbol group includes L elements and corresponds to a transmission timing of a channel, or the... Including X L elements, wherein X The L elements comprise X repetitions of a single vector containing L elements, and the... Corresponding to the X OFDM symbol groups; For the second category of DMRS ports, the Including X L elements, wherein X The L elements comprise X distinct vectors, and each of the X distinct vectors comprises L elements, and the Corresponding to the X OFDM symbol groups; or the Including X L elements and corresponding to the X OFDM symbol groups.

41. The method of claim 3, wherein the second category DMRS port comprises one of the following: For the third category of DMRS ports, X is 2; For the fourth category of DMRS ports, X is 3; or For the third category DMRS port, X is 2; and for the fourth category DMRS port, X is 3.

42. The method of claim 41, wherein the third category DMRS port and the fourth category DMRS port share the same DMRS port index.

43. The method of claim 42, wherein the category of DMRS ports having the same DMRS port index is determined by the total number of DMRS OFDM symbol groups for a transmission timing of a channel, wherein the category includes the third category and the fourth category.

44. The method of claim 18, wherein the category of the DMRS port or the first indication comprises at least one of the following: The number of DMRS OFDM symbol groups for DMRS ports with the same DMRS port index; The following indication is used to indicate whether the number of DMRS OFDM symbol groups of the DMRS ports having the same DMRS port index is greater than 1; or The length of the TD-OCC for the DMRS ports that have the same DMRS port index.

45. A method for wireless communication, comprising: The wireless communication node sends first information to the wireless communication device to determine the first demodulation reference signal (DMRS) table; The wireless communication node sends the value of the field to the wireless communication device in the signaling. The value of the field is used by the wireless communication device to determine a first DMRS parameter based on the first DMRS table and the value of the field. The first DMRS table includes a mapping between the values ​​of the fields in the signaling and the values ​​of the first DMRS parameters, and each value in the field is associated with a corresponding value in 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 the different categories of the at least two categories of DMRS ports correspond to at least one of the following: a different number of DMRS orthogonal frequency division multiplexing (OFDM) symbol groups of a time-domain orthogonal overlay code (TD-OCC), a different number of DMRS OFDM symbols of a TD-OCC, a different number of DMRS OFDM symbols in a DMRS OFDM symbol group of a TD-OCC, or different relationships between vectors of a TD-OCC. Each DMRS OFDM symbol group in the DMRS OFDM symbol group includes one or more consecutive OFDM symbols.

46. ​​A non-transitory computer-readable medium storing instructions that, when executed by at least one processor, cause the at least one processor to perform the method according to any one of claims 1 to 45.

47. An apparatus comprising: At least one processor is configured to implement the method according to any one of claims 1 to 45.

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