Channel State Information Reporting

Abstract

A method of wireless communication includes determining, by a first communication device, channel state information CSI corresponding to P ports, where P is a positive integer, and transmitting, by the first communication device, CSI including at least one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, or R values ​​of rank indicator RI to a second communication device, where the PMI indicates C4 sets of precoding matrices corresponding to C4 first-type time domain units, the Q sets of CQI correspond to Q second-type time domain units, and the R values ​​of RI correspond to R third-type time domain units, and Q, R, and C4 are positive integers.

Description

[Technical Field]

[0001] Technical Field This document relates generally to wireless communications. [Background technology]

[0002] background Mobile communication technologies are moving the world towards an increasingly connected and networked society. Compared to existing wireless networks, next-generation systems and wireless communication technologies will need to support a much wider range of use case characteristics and provide a more complex and sophisticated range of access requirements and flexibility.

[0003] Long Term Evolution (LTE) is a standard for wireless communications for mobile devices and data terminals developed by the 3rd Generation Partnership Project (3GPP®). LTE Advanced (LTE-A) is a wireless communications standard that extends the LTE standard. The fifth generation of wireless systems, known as 5G, is dedicated to supporting higher data rates, a large number of connections, ultra-low latency, high reliability, and other emerging business needs. Summary of the Invention [Means for solving the problem]

[0004] overview A method, apparatus, and computer-readable medium are described. The disclosed techniques may be used by embodiments to receive a reference signal or to provide a feedback report based on a received reference signal.

[0005] In one exemplary aspect, a wireless communication method is disclosed. The method includes: determining, by a first communication device, channel state information (CSI) corresponding to P ports, where P is a positive integer; and transmitting, by the first communication device, CSI including at least one set of precoding matrix indicators (PMI), Q sets of channel quality indicators (CQI), or R values ​​of rank indicators (RI) to a second communication device. The PMI indicates C sets of precoding matrices corresponding to C first-type time-domain units, the Q sets of CQIs correspond to Q second-type time-domain units, and the R values ​​of RI correspond to R third-type time-domain units, where Q, R, and C4 are positive integers.

[0006] In another aspect, another method is disclosed that includes receiving, by a first communication device, a signal transmission from a second communication device, the signal transmission including transmission of a first reference signal and a second reference signal according to a pattern, and transmitting, by the first communication device to the second communication device, channel state information according to the first reference signal and the second reference signal.

[0007] In yet another exemplary aspect, another wireless communication method is disclosed. The method includes receiving, by a second communication device, CSI from a first communication device, including at least one set of precoding matrix indicators (PMI), Q sets of channel quality indicators (CQI), or R values ​​of rank indicators (RI), where the PMI indicates C sets of precoding matrices corresponding to C first-type time-domain units, the Q sets of CQIs correspond to Q second-type time-domain units, and the R values ​​of RI correspond to R third-type time-domain units, and Q, R, and C4 are positive integers.

[0008] In another aspect, another method is disclosed that includes transmitting, by a second communication device, a signal transmission to a first communication device, the signal transmission including transmission of a first reference signal and a second reference signal according to a pattern, and receiving, by the second communication device, from the first communication device, channel state information acquired by the first communication device according to the first reference signal and the second reference signal.

[0009] In yet another aspect, a wireless communication apparatus is disclosed, the apparatus including a processor configured to perform the disclosed method.

[0010] In yet another aspect, a computer readable medium having program code stored thereon is disclosed that, when executed by a processor, causes the processor to implement the methods disclosed herein.

[0011] These and other aspects are described throughout the specification. The present invention provides, for example, the following. (Item 1) 1. A method of wireless communication, comprising: determining, by the first communication device, channel state information CSI corresponding to P ports, where P is a positive integer; transmitting the CSI by the first communication device to a second communication device; Including, The CSI includes at least one set of precoding matrix indicators (PMI), Q sets of channel quality indicators (CQI), or R values ​​of rank indicators (RI); The PMI of one set is C 4 C corresponding to the first type of time domain units 4 Q sets of precoding matrices, wherein the Q sets of CQIs correspond to Q second-type time domain units, and R values ​​of RI correspond to R third-type time domain units; Q, R, C 4 is a positive integer, method. (Item 2) Said C 4 Each precoding matrix of the set of precoding matrices is based on three types of vector sets, including a first type vector set, a second type vector set, and a third type vector set; or One set of PMI includes at least one of information about one first-type vector set, information about one or v second-type vector sets, information about D third-type vector sets, and indices of the strongest coefficients or E coefficients, where v is the total number of layers, and D and E are positive integers. Item 1. The method according to item 1, comprising at least one of the following: (Item 3) 3. The method according to item 2, wherein each first type vector contains P / 2 elements. (Item 4) Each second type vector is a vector of N 3 4. The method according to any one of items 2 to 3, comprising the elements: (Item 5) Each third type vector is C 4 C corresponding to one of the first type time domain units 4 5. The method of any of items 2 to 4, comprising the elements: (Item 6) The P / 2 elements of one first-type vector have the same amplitude, and each of the P / 2 elements has a respective phase; or Only one of the P / 2 elements has value 1, and the remaining (P / 2-1) elements have value 0. 6. The method according to any one of items 3 to 5. (Item 7) The kth element of each second type vector has the format

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[0012] [Figure 1] 1-2 are timing diagrams illustrating examples of one or more transmission opportunities of a channel state information (CSI) reference signal and the duration of the CSI. [Figure 2] 1-2 are timing diagrams illustrating examples of one or more transmission opportunities of a channel state information (CSI) reference signal and the duration of the CSI.

[0013] [Figure 3] FIG. 3 is a timing diagram for an example of the second type of time unit.

[0014] [Figure 4] FIG. 4 is a flowchart of an exemplary method of wireless communication.

[0015] [Figure 5] FIG. 5 is a flowchart of an exemplary method of wireless communication.

[0016] [Figure 6] FIG. 6 shows an exemplary block diagram of a hardware platform that may be part of a network or communication device.

[0017] [Figure 7] FIG. 7 illustrates an example wireless communication network including a base station (BS) and user equipment (UE) according to some implementations of the disclosed technology.

[0018] [Figure 8] FIG. 8 is a flowchart of an exemplary method of wireless communication.

[0019] [Figure 9] FIG. 9 is a flowchart of an exemplary method of wireless communication. DETAILED DESCRIPTION OF THE INVENTION

[0020] Detailed Description In the following description, headings may be used to improve clarity without limiting the various disclosed feature combinations. Furthermore, terminology specific to certain industry standards (e.g., 3GPP, LTE, or 5G) is used only for ease of description, and the disclosed technology may be used in other wireless systems implementing different communication protocols.

[0021]

[0003] The number of wireless devices deployed in wireless communication networks has steadily increased over the past few years. Increasingly, users expect the availability of high-bandwidth communication connections in many settings, including while moving at high speeds. Existing wireless communication standards find it difficult to provide high-quality service and meet user expectations in scenarios where the wireless communication channel between a network-side device and a user device (sometimes referred to as user equipment, UE) may be unreliable or rapidly changing due to the high speed movement of the user device in use.

[0022] In one exemplary aspect, this document provides various techniques that can be used to transmit, receive, or process reference signals that enable a wireless device to quickly adapt to time-varying characteristics of a wireless communication channel and provide a user device with a reliable and high-quality wireless connection. The wireless device feeds back a set of precoding matrix indicators (PMIs). The set of PMIs indicates a set of C4 precoding matrices corresponding to C4 first-type time-domain units. The set of PMIs is applied to each precoding matrix in the set of C4 precoding matrices, which captures the frequency-domain and time-domain characteristics of the channel. All precoding matrices share the same information indicated by the set of PMIs. This reduces CSI overhead and allows the second communication device to obtain more accurate CSI. This document also reports RI / CQI for multiple time-domain units in one CSI report. This allows the second communication device to schedule with high flexibility based on the reported CSI.

[0023] Example 1

[0024] The UE determines P CSI-RS ports according to at least one of received signaling or reported CRI (CSI-RS Resource Indicator). The UE measures the P CSI-RS ports and obtains CSI (Channel State Information) based on the measurements. The UE reports the determined CSI to the gNB, where P is the number of CSI-RS ports. The CSI includes at least one of Q sets of CQI (Channel Quality Indicator), R values ​​of RI (Rank Indicator), or a set of PMI (Precoding Matrix Indicator). The following is a procedure for determining CSI.

[0025] The Q sets of CQIs are for Q second-type time domain units. Each of the Q sets is for one of the Q second-type time domain units. The R values ​​of RI correspond to R third-type time domain units. Each of the R values ​​of RI corresponds to one of the R third-type time domain units. One set of PMI indicates C4 sets of precoding matrices for C4 first-type time domain units. Each of the C4 sets of precoding matrices corresponds to one of the C4 first-type time domain units. Each of the C4 sets of precoding matrices includes N3 precoding matrices. In another implementation, the number of precoding matrices in different sets of C4 sets of precoding matrices may be different. For example, the number of precoding matrices in a precoding matrix set corresponding to a first-type time domain unit that includes at least one transmission opportunity for the P CSI-RS ports is greater than the number of precoding matrices in a precoding matrix set corresponding to a first-type time domain unit that does not include a transmission opportunity for the P CSI-RS ports. CSI is for one CSI report.

[0026] As shown in FIG. 1 or 2, there are CSI-RS transmission opportunities for C1 of P CSI-RS ports during T1. The UE transmits CSI-RS to channel h at each CSI-RS transmission opportunity t=0, 1, ..., C1 for each first frequency domain unit k1=0, 1, ..., N4-1. t where h t contains R rows and P columns, where R is the number of receive antennas at the UE. Then, for each first frequency domain unit k1=0, 1, ..., N4-1, the UE [ka] The UE obtains, for each second frequency domain unit k=0, 1,...,N3-1, and a set of C4 first-type time domain units, e.g., H k1 Based on N4, during T3, obtain a precoding matrix for each first-type time domain unit belonging to C4=C3 and t=0, 1, ..., C3. T3 is performed as shown in FIG. 1 or FIG. 2. 3,1 , T 3,2 T 3,3 T 3,4 , T 3,5 , T 3,6 or T1. 3,1 is equal to one period of CSI-RS resource 1 that includes P of CSI-RS port starting from the first OFDM symbol of the slot in which the first symbol of a burst of CSI-RS resource 1 is located, or starting from the first OFDM symbol of the first transmission opportunity of CSI-RS resource 1 within a burst. 3,2 is equal to one period of CSI-RS1 minus T1, which is equal to the duration of a burst of CSI-RS1. 3,3 The length of T is also equal to one period of CSI-RS1, but starts from the symbol after the end of the burst of CSI-RS1. 3,4 is equal to one period of CSI-RS1 plus one burst of CSI-RS1 in the adjacent period. 3,5 The duration of 3,4 The gNB is defined as the starting position and / or T 3,5The length of T 3,6 The starting OFDM symbol of CSI-RS resource 1 precedes the first OFDM symbol of the slot in which the first symbol of the burst for CSI-RS resource 1 is located, or precedes the first OFDM symbol of the first transmission opportunity for CSI-RS resource 1 within the burst of the first OFDM symbols. The gNB can also signal information regarding the duration T3 of the reported CSI. For example, the gNB signals the starting position and / or the length of duration T3. One period of CSI-RS1 includes one burst. One burst includes one or more transmissions of CSI-RS1. One burst of CSI-RS1 includes C1 transmission opportunities for CSI-RS1. CSI-RS1 is simply the name of CSI-RS resource 1, which includes P CSI-RS ports. One period of P CSI-RS ports includes one burst. One burst includes one or more transmissions of P CSI-RS ports. Within one burst of CSI-RS1, there are C1 transmission opportunities for P CSI-RS ports. The first frequency domain unit can be the same as or different from the second frequency domain unit. N3 ≥ N4. The difference between Figure 1 or Figure 2 is the end position of T1. There is no C3 first-type time domain unit t = 0, 1, ..., C3 first-type time domain unit between the end of the CSI-RS burst and the start of T2 in Figure 1 or Figure 2. The end position of T1 can be the last transmission opportunity of a CSI-RS burst or the end of the slot in which the last opportunity of a CSI-RS burst is located. The last transmission opportunity of the P CSI-RS ports in the n1 period belongs to T1 in the n1 period instead of T2 in the n1 period.

[0027] For each second frequency domain unit k=0, 1, ..., N3-1 and each first type time domain unit t=0, 1, ..., C3, the UE obtains a precoding matrix. These N3*C3 precoding matrices are based on three types of vector sets. The first type vector sets are each [ka] L includes a first type vector containing elements of [ka] The elements of have the same amplitude, [ka] Each of the elements of has a respective phase, or [ka] Only one of the elements of has value 1, and the rest [ka] The elements of have the value 0. The PMI indicates one first-type vector set shared by all layers. The PMI indicates one or v second-type vector sets. If it indicates one second-type vector set, the set is shared by all layers. If it indicates v second-type vector sets, each of the v second-type vector sets corresponds to one of the v layers. v is indicated by the gNB or reported by the gNB. If the CSI includes R values ​​of RI (rank indicator), v is one of the first and maximum of the R values ​​of RI, where the maximum value of RI corresponds to duration T1. Each second-type vector set includes M second-type vectors, each including N3 elements corresponding to one frequency-domain unit k (i.e., the second frequency-domain unit). In some implementations, different second-type vector sets can include different numbers of second-type vectors. The PMI indicates D third-type vector sets, where D is greater than 1. Each of the D third-type vector sets includes an X third-type vector, each including an element of C3, where each element of C3 corresponds to one first-type time-domain unit t. L, M, and X are integers greater than 0. In some implementations, the sum of L, M, or X must be greater than 1. In some implementations, L must be greater than 1. L, M, and X are based on at least one of the received signaling, P, the total number of layers v, C3, or N3. In some implementations, L must be greater than 1, and the sum of L, M, or X must be greater than 4. In some implementations, L must be greater than 1, and the sum of M and X must be greater than 1.

[0028] In some implementations, L≦X≦M. In some implementations, X is greater than 2. In some implementations, the above restrictions L, M, or X apply to L, M, and X for each layer. Each of the N3*C3 precoding matrices is determined according to one set of first-type vector sets, one or v second-type vector sets, and D third-type vector sets. Each of the v second-type vector sets is used to determine a respective column of the N3*C3 precoding matrix, where the column corresponds to one of the v layers.

[0029] One precoding matrix W of N3*C3 for each second frequency domain unit k=0,1,...,N3-1, for each first type time domain unit t=0,1,...,C3, and for each layer l=0,1,...,v-1 k,t of [ka] The l-th column of has one of the formats shown in equations (1 to 4). [ka]

[0030] where v i ,i∈{0,1,…,L-1} is a first type vector in the first type vector set, [ka] is the k-th element of the second-type vector with index f in the set of second-type vectors, [ka] is the element associated with t of the third-type vector with index x in the third-type vector set. l,i,f,j The phase and amplitude of a must be fed back to the gNB. l,i,f,j The amplitude of is less than or equal to 1.

[0031] One set of PMI contains information about one of the first type vector sets, information about one or v second type vector sets, information about D third type vector sets, and a l,i,f,j , i∈{0,1,...,2L-1} (e.g., weighting coefficients).

[0032] In some implementations, a first type vector v i can be obtained according to the following formula: [ka]

[0033] The information about one first vector set includes the indices of e and m for each i=0, 1, ..., L-1. For example, v i About [ka] where v i =v ei , mi The PMI of one first vector set is n for each i=0,1,…,L-1. 1,i , n 2,i and information on q1, q2, which is the same for all i.

[0034] In some implementations, v i Index of [ka] Only one element with value 0 has the value [ka] The elements of are zero, and the CSI is i , for i=0,1,…,L-1 [ka] Contains information about.

[0035] In some implementations, one second frequency domain unit includes one subband or half of one subband, and the second type vector [ka] is in the following format: [ka] It has. [ka] is the second vector [ka] The information about one second vector set included in the CSI is the k-th element of each second type vector in the second vector set. [ka] In some implementations, the information about the second vector set included in the CSI includes information about the absolute value of each second type vector in the second vector set. [ka] It does not include remapping. [ka] After [ka] and for the M-1 second type vectors in the second vector set, [ka] After remapping, it contains only [ka] For a second vector with [ka] In some implementations, the second vector set is specific to one layer. The CSI includes information about the second vectors set for each layer. That is, the CSI includes v second type vector sets. Each of the v second type vector sets is used to determine a respective column of the N3*C3 precoding matrix. Different layers correspond to one piece of information about the second type vector set, and different layers correspond to different second vector sets. In another implementation, the second type vector set is shared by all layers. The CSI includes information about one second type vector set shared by all layers, and in Equations (1 to 3), [ka] teeth, [ka] can be replaced by [ka] is Y f can be replaced by

[0036] In some implementations, each first type time domain unit includes one OFDM symbol, and t is the index of the OFDM symbol index during T3.

[0037] In some implementations, each first-type time domain unit includes one or more OFDM symbols, where t is an OFDM symbol group index among T3, i.e., t is an index of the first-type time domain unit. One OFDM symbol group corresponds to one first-type time domain unit. Different first-type time domain units with different indexes t include the same or different numbers of OFDM symbols.

[0038] In some implementations, a time domain unit of the first type includes at most one transmission opportunity for P of the CSI-RS ports.

[0039] In some implementations, one first type time domain unit includes one or more slots.

[0040] In some implementations, the period for reporting CSI is equal to the period of P of the CSI-RS ports. For example, the period for reporting CSI cannot be configured. It is equal to the period of the P CSI-RS. The time at which the PUSCH / PUCCH (Physical Uplink Shared Channel or Physical Uplink Control Channel) containing the CSI, including the PMI, is located is based on the position of the last transmission opportunity of the P CSI-RS ports of one burst. It is after the last transmission opportunity of the P CSI-RS ports of one burst, as shown in FIG. 1 or FIG. 2. The gNB can signal a gap between the last transmission opportunity of the P CSI-RS ports of one burst and the start time at which the PUSCH / PUCCH containing the CSI is located. The information about the gap includes at least one of the amount of slots or the amount of OFDM symbols.

[0041] In some implementations, the number of OFDM symbols in one first-type time domain unit may be the number of OFDM symbols in one CSI-RS1 transmission opportunity, or the OFDM symbol gap between the start OFDM symbol and the end OFDM symbol of one CSI-RS1 transmission opportunity, each of which is the OFDM symbol gap between the start OFDM symbol and the end OFDM symbol of one CSI-RS1 transmission opportunity of C1, a received value, F x , f x , F x The maximum value of f x , the value reported by the UE, or the capabilities reported by the UE, where F x is the Doppler shift (or Doppler spread) associated with a third type vector with index x, and F x is in Hz, and f x is 1, or 1 subcarrier space. For example, the number of OFDM symbols in one first-type time domain unit is at least one of the number of OFDM symbols in one CSI-RS1 transmission opportunity, the OFDM symbol gap between the start OFDM symbol and the end OFDM symbol of one CSI-RS1 transmission opportunity, or the maximum value of C1 OFDM symbol gap.

[0042] Each third type vector is a Doppler frequency shift F x , f x based on at least one of the subcarrier spacing Δf, or the length of the OFDM symbol, e.g., a time domain vector for a first type of time domain unit t [ka] Any one of the (e.g., third type vectors) can have at least one of the following formats:

[0043] Option 1: [ka] In that case, the time domain vector is the parameter of the frequency domain vector (e.g., the second type vector) [ka] Furthermore, a second type of vector with index f is reported: [ka] is the value after remapping, i.e. reported [ka] where: [ka] However, the third type of vector is used to generate [ka] Remapped [ka] The third type of vector, F, is x When is greater than F x For example, before remapping, [ka] A third type of vector that uses values [ka] and after remapping [ka] A third type of vector that uses values [ka] The relationship between has the following format:

[0044] [ka]

[0045] [ka] teeth, [ka] Compared to [ka] After remapping, add [ka] Using [ka] This is the case when generating a third type of vector, such as the coefficients [ka] is used to offset l,i,f,x Especially F x If is large, the number of bits for reporting a l,i,f,x Therefore, before remapping, [ka] For example, the UE may report a single value before remapping. [ka] reports the M-1 value after remapping [ka] Report. [ka] is a l,i,f,x corresponds to the strongest value of . Then, [ka] The pre-remapping values ​​are used to generate a third type of vector: s l,f,x =s l,f,x,b The pre-remapping or post-remapping values ​​are used to generate a second type vector. The second type vector using the pre-remapping values ​​and the second type vector using the post-remapping values ​​are identical in terms of performance. In another implementation, the UE generates M values ​​before remapping. [ka] Report. [ka] The values ​​of a can be used directly to generate vectors of the second and third types. However, l,i,f,x The strongest value of does not always correspond to f=0. l,i,f,x The f corresponding to the strongest value of should be the feedback by the UE to the gNB. [ka] Refers to...

[0046] Option 2: Use one to determine the third type of vector. [ka] is used, [ka] is not unique to each second type of vector. Then, [ka] teeth, [ka] where: [ka] teeth, [ka] It is one of them.

[0047] Option 3: [ka]

[0048] Option 4: [ka] where: [ka] is the value before remapping [ka] or the value after remapping performed in option 1 [ka] It is one of them. Option 5: [ka] is. Option 6: [ka] is. Option 7: [ka] is. Option 8: [ka] is. Option 9: [ka] where: [ka] teeth, [ka] It is one of them. Option 10: [ka] is. Option 11: [ka] is. Option 12: [ka] is.

[0049] [ka] If the second type of vector set is not reported for each layer, [ka] The subscript l in f can be dropped. x is a value associated with a third type of vector with index x, which may be smaller than 3 or 2, e.g. [ka] where f is the index of the second-type vector among M second-type vectors f∈{0, 1, ..., M-1}. The subcarrier space of the CSI-RS is [ka] is.

[0050] T OFDM is the duration of one OFDM symbol. For example, [ka] is.

[0051] where l OFDM is the OFDM symbol index within the subframe κ=64. OFDM About T OFDM may be different, in which case T OFDM teeth, [ka] can be marked by N3 is the number of frequency domain units in one OFDM symbol or one first type time domain unit. [ka] In another implementation, [ka] For example, [ka] and normal CP (cyclic prefix) [ka] and [ka] and normal CP (cyclic prefix) [ka] and About the expanded CP [ka] is.

[0052] It can be seen that when a regular CP is used, the CP length is different for different OFDM symbol sets. The first OFDM symbol set is index [ka] The second set of OFDM symbols includes OFDM symbols having index [ka] The OFDM symbol includes:

[0053] [ka] , where z is the number of OFDM symbols with longer CP from the start of the first type time domain unit with t=0 to the end of the time unit with the current t.

[0054] If one first-type time domain unit contains one OFDM symbol, t is the index of the OFDM symbol relative to the start of T3, which is not the start of the slot.

[0055] [ka] or

[0056] If t is the index of the OFDM symbol relative to the starting OFDM symbol of T3, which is the start of the slot, [ka] is.

[0057] If one of options 1, 2, 3, 6, 11, or 7 is adopted, F x The units of F should be reported as Hz. x It is necessary to determine the quantification step for reporting at which the frequency is to be determined. In some implementations, the quantification step may be 100 Hz, or 50 Hz, or other values.

[0058] If one of options 4, 5, 8, 9, 11, or 10 is adopted, [ka] f x The unit of is 1, or f x The unit of f can be said to be Δf. x In some implementations, the report f x The quantification step for f should be determined. For example, x ∈{0, 0.1, 0.2, ..., 2}. In some implementations, the quantification step depends on the subcarrier spacing Δf. For example, the larger the reference subcarrier spacing Δf, the smaller the quantification step. For example, if the reference subcarrier spacing Δf is 15 kHz, the quantification step is 0.1, i.e., f x ∈{0, 0.05, 0.1, ..., 2}. If the reference subcarrier spacing Δf is 30 kHz, the quantification step is 0.05, i.e., f x ∈{0, 0.05, 0.1, ..., 2}. The reference subcarrier spacing Δf can be the subcarrier space of the p CSI-RS ports or the subcarrier space configured in one CSI report.

[0059] In the above description (which will be referred to as the first method for determining t of the third-type vector or each of the third-type vectors), for t=0, 1, ..., C3-1, i.e., for k frequency domain units, the UE feeds back precoding matrices of C3, each of which corresponds to one domain unit of T3. The UE feeds back each precoding matrix for every time unit with index t of T3, i.e., C4=C3. t is relative to the start of T3.

[0060] In the second method for determining the t of the third-type vector, the UE only feeds back the precoding matrix of the set of first-type time domain units during T1, and each first-type time domain unit in the set is [ka] or other expressions of the third type vector t CSI-RS,occasion-i where t is the index of the first-type time domain unit that includes the ith CSI-RS transmission opportunity during T1. The first-type time domain unit index is relative to the first OFDM symbol of the time unit with index t=0, and the time unit with index t=0 precedes the CSI-RS transmission opportunity with index i=0. For example, CSI-RS1 transmission opportunity 1 is in OFDM8 in slot 3, one first-type time unit includes one OFDM symbol, t is relative to the start of slot 3, and therefore t CSI-RS,occasion-1 is equal to 9. C4=C1.

[0061] The third method for determining t for a third type of vector is the same as the second implementation, except for the following. [ka]

[0062] That is, t is for a first-type time domain unit that contains the first transmission opportunity for the P CSI-RS ports. The first-type time domain unit with index 0 contains the first transmission opportunity for the P CSI-RS ports. C4 = C1.

[0063] The fourth method for determining t for the third type vector is the same as the first implementation, except for the following. [ka]

[0064] where t CSI-RS,position_i where t is the ith transmission opportunity for the P CSI-RS ports during T3. t is relative to the OFDM symbol that precedes the first OFDM symbol of the time unit that contains the first transmission opportunity for the P CSI-RS ports in the burst. That is, the first time unit of T3 precedes the first OFDM symbol of the first type of time unit that contains the first transmission opportunity for the P CSI-RS ports in the burst.

[0065] In some implementations, if the C4s of all the first-type time units have the same time length, such as seconds, then t is a first-type time domain unit index. If at least two first-type time domain units have different time lengths, then t is an OFDM symbol index.

[0066] In some implementations, if the C4s of all first-type time units have the same number of OFDM symbols, t is a first-type time-domain unit index. If at least two first-type time-domain units have different numbers of OFDM symbols, t is an OFDM symbol index.

[0067] When the first or fourth method is employed to determine t for the third-type vector (or for each third-type vector in the second vector set), the PMI indicates a matrix of N3 for each first-type time domain unit during T3, regardless of whether the first-type time domain unit includes a transmission opportunity for the P CSI-RS ports. That is, some C4 first-type time domain units of the first-type time domain units include one transmission opportunity for the P CSI-RS ports, and some C4 first-type time domain units do not include any one transmission opportunity for the P CSI-RS ports. The first-type time domain unit indexes are continuous. When the second or third method is employed, the PMI indicates a matrix of N3 for each first-type time domain unit including one transmission opportunity for the P CSI-RS ports. The first-type time domain unit indexes may be discontinuous or continuous. In some implementations, when X is greater than 1, F of X may be used. x ,x=0,1,…,X-1 or X x ,x=0,1,…,X-1 are reported by the difference method with the reference value. x When reporting F reference The reference value may be F or F. The reference value may be reported using an absolute value, or the reference value may be a value determined by a rule or a fixed value that is not reported by the UE. reference If so, the UE reference and [ka] If the reference value is F0, the UE reports F0 and [ka] Report. F reference (or F0) is the reporting period for the base value. x ’ is equal to the reporting period or F x ’ can be a multiple of the reporting period.x If reporting, the standard is f reference The reference value may be reported using an absolute value, or the reference value may be a value determined by a rule or a fixed value that is not reported by the UE. reference If so, the UE reference and [ka] If the reference value is f0, the UE reports f0 and [ka] Report. f reference The period for reporting the reference value, such as f (or f0), is x ’ is equal to the reporting period, or f x ’ can be a multiple of the reporting period. In some implementations, F x ’ or f x ’ can be used directly to generate a third type vector. For example, F in the above options 1-3, 6, 7, 11 of the format of a third type vector with index x x is F x ’ The format of the third type vector with index x can be replaced by f in the above options 4, 5, 8-10, 12. x is f x ’ If the reference value is F0 or f0, the UE [ka] About simply X-1 F x ’ or f x ’ The UE reports F0 to the gNB. ’ and f0 ’ Do not report.

[0068] In another implementation, X's F x , f for x=0,1,…,X-1 or X x , x=0,1,...,X-1 are reported by dividing by the reference value. If the reference value is F0, the UE reports F0 and F x ’ =F x / F0, x=1,2,…,X-1. The UE reports F with reference value X. x F is not one of reference If F reference and F x ’ =F x / F reference , x=0,1,2,...,X-1. If the reference value is f0, the UE reports f0 and f x ’ =f x / f0, x=1,2,…,X-1. The UE reports F with reference value X. x f is not one of reference If f reference and f x ’ =f x / f reference , x=1,2,…,X-1. f0, f reference , or f x ’ The quantification step of the reference value f depends on the subcarrier spacing Δf. For example, the larger the reference subcarrier spacing Δf, the smaller the quantification step. For example, if the reference subcarrier spacing Δf is 15 kHz, the quantification step of the reference value f x ’ is 0.1, i.e., f reference , or f0∈{0,0.1,0.2,…,2} and f x ’ The step of f is 0.01, i.e., x ’ ∈{0, 0.01, 0.02, ..., 1}. If the reference subcarrier spacing Δf is 30 kHz, the quantification step is 0.05, i.e., f reference , f0∈{0,0.05,0.1,…,2}, and fx ’ The step is 0.005, i.e., f x ’ ∈{0,0.005,0.01,…,1}.

[0069] In some implementations, f of multiple serving cells reference , f0, F reference , F0, etc. may be the same / have a relationship. The f used to determine the first precoding matrix corresponding to the CSI-RS port received in serving cell 1 reference , f0, F reference , F0 and f used to determine the precoding matrix corresponding to the CSI-RS port received in serving cell 2. reference , f0, F reference , F0 are the same as or have a relationship with each other. For example, [ka]

[0070] where b=1 or b is based on at least one of received signaling, a reported value, the frequency carrier of serving cell 1, the frequency carrier of serving cell 2, or a ratio between two frequency carriers of two serving cells. For example, b is equal to the quotient of the frequency carrier of serving cell 1 divided by the frequency carrier of serving cell 2.

[0071] The granularity of the third type vector set can be at least one of the following:

[0072] In some implementations, the third type vector set is layer-specific. The CSI reported by the UE includes information on v third type vector sets, each corresponding to one of the v layers. The precoding matrix for each layer l=0, 1, ..., v-1 is [ka] teeth, [ka] That is, D is equal to v, and each of the v sets of third-type vectors is used to determine a respective column of the N3*C4 precoding matrix, where the column corresponds to a layer. One set of PMI includes information about the v sets of third-type vectors. For example, one set of PMI is F x , F x ’ , f x , or f x ’ Contains v sets of F in options 1 to 12 x , F x ’ , f x , or f x ’ are F l,x , F l,x ’ , f l,x , or f l,x ’ can be replaced by

[0073] In some implementations, the third type of vector set is unique to every layer.

[0074] In some implementations, a set of third-type vectors is unique for each first-type vector with index i=0, 1, ..., L-1, and the subscripts of s are [ka] D is equal to L. A set of PMI contains information about a set of L third-type vectors. For example, a set of PMI contains information about F x , F x ’ , f x , or f x ’ Includes a set of L. F in options 1-12 x, F x ’ , f x , or f x ’ are F i,x , F i,x ’ , f i,x , or f i,x ’ Each of the sets of L third type vectors is used to determine all columns of each of the N3*C4 precoding matrices.

[0075] In some implementations, the third type of vector set is unique to the first type of vector set.

[0076] In some implementations, a set of third-type vectors is unique for each second-type vector with index f=0, 1, ..., M-1, and the subscripts of s are [ka] One set of PMI contains information about M sets of third type vectors. For example, one set of PMI contains information about M sets of third type vectors. x , F x ’ , f x , or f x ’ Contains M sets of F in options 1-12 x , F x ’ , f x , or f x ’ are F f,x , F f,x ’ , f f,x , or f f,x ’Each of the M sets of third type vectors is used to determine all columns of each of the N3*C4 precoding matrices. Instead of only options 1, 4, 6, and 8 being used, any of options 1 through 12 can be used to determine the format of the third type vector.

[0077] In some implementations, a set of third-type vectors is unique for each second-type vector with index f=0, 1, ..., M-1, and the subscripts of the third-type vector s are [ka] Such as f. If the UE is F x , F x ’ , f x , or f x ’ Unlike the above method, which reports a set of M x , F x ’ , f x , or f x ’ In the case of different second parameters, the reported [ka] One set of is in Choice 1, Choice 4, Choice 6, or Choice 8 [ka] The UE may then determine M sets of third type vectors, each of which is used to determine every column of each of the N3*C4 precoding matrices, including X third type vectors.

[0078] In some implementations, X = M. There is a one-to-one mapping between M second-type vectors and X third-type vectors, for example, choices 11-12.

[0079] In some implementations, the set of vectors of the third type is unique to the set of vectors of the second type, and the third type vectors do not have the subscript f.

[0080] In other words, the subscript of one third-type vector can include at least one of a layer index l, a first-type vector index i, or a second-type vector index f. For example, [ka] teeth, [ka] It can be marked by one of the following: [ka] is specific to one first-type vector with index i, one second-type vector with index f, and one layer index l. The UE needs to report an L*M*v set of third-type vectors, e.g., F x , F x ’ , f x , or f x ’ Alternatively, the UE reports a set of L*v*M of F x , F x ’ , f x , or f x ’ For M second-type vectors f, the reported F x , F x ’ , f x , or fx ’ The L*v set of can be expanded to L*v*M. Each set corresponds to one i, one f, and one l. There are X third-type vectors in each set. X for different sets can be different or the same. That is, the number of different third-type vectors in the D third-type vector sets can be different or the same. In Equation (1) and Options 1 to 10, [ka] teeth, [ka] can be replaced by one of [ka] Any one of the above options 1 to 12 is obtained based on one of the above options 1 to 12 to obtain a third type vector having index x.

[0081] [ka] is unique to a first type vector set and is shared by all first type vectors within the first type vector set. [ka] is unique to every layer and is shared by all layers. [ka] is unique to the set of all second type vectors and is shared by all second type vectors. [ka] is unique to the first and second type vector sets and is shared by all first and second type vectors within the first and second type vector sets. [ka] is unique only to each second type vector. [ka] is unique only to each first type vector. [ka] is shared by all layers, all first type vectors and all second type vectors.

[0082] The time domain index t is incremented for duration T3.

[0083] In short, the UE reports one set of PMI in one CSI report. The PMI indicates C4*N3 precoding matrices. Each of the C4*N3 precoding matrices corresponds to one frequency domain unit and one first-type time domain unit. The information included in one set of PMI applies each of the C4*N3 precoding matrices, where C4 is greater than 1 and / or C4*N3 is greater than 1.

[0084] One set of PMI consists of three types of vector sets and weighted coefficients a l,i,f,x,t Contains information about.

[0085] C4 is the number of elements contained in one third-type vector. For example, in the first method for determining t of a third-type vector, t = 0, 1, ..., C3, and C4 = C3. In the second method for determining t of a third-type vector, [ka] and C4 = C1. A third method for determining t for a third type of vector is [ka] and C4 = C1. A fourth method for determining t for a vector of the third type is

[0086] [ka] and

[0087] C4 is above C3.

[0088] Weighted coefficient a of L*M*X*v l,i,f,x,t can be reported by using at least one of the following methods:

[0089] Method 1. [ka] and the UE is [ka] Report.

[0090] Equation (1) can then be replaced as:

[0091] [ka]

[0092] In equation (5), [ka] However, respectively, [ka] If replaced by, equations (3-4) can also be updated by equation (5). Of course, in equation (5), [ka] teeth, [ka] can be replaced by one of

[0093] Method 2: [ka] and then equation (1) can be replaced as:

[0094] [ka]

[0095] In equation (6), [ka] However, respectively, [ka] If replaced by, equations (3-4) can also be updated by equation (6). Of course, in equation (6) [ka] teeth, [ka] For each layer l, the UE [ka] Alternatively, [ka] Therefore, [ka] does not need to be reported by the UE.

[0096] Method 3: [ka] and then equation (1) can be replaced as: [ka]

[0097] For each layer l, the UE [ka] Alternatively, [ka] Therefore, [ka] does not need to be reported by the UE.

[0098] Method 4: [ka] and then equation (1) can be replaced as:

[0099] [ka]

[0100] For each layer l, the UE [ka] Alternatively, [ka] Therefore, [ka] does not need to be reported by the UE.

[0101] Method 5: [ka] and then equation (1) can be replaced as:

[0102] [ka]

[0103] For each layer l, the UE [ka] Alternatively, [ka] does not need to be reported by the UE.

[0104] Method 6: [ka] and then equation (1) can be replaced as: [ka]

[0105] For each layer l, the UE [ka] You can report [ka] does not need to be reported by the UE, or [ka] Therefore, [ka] does not need to be reported by the UE.

[0106] Method 7: [ka] and then equation (1) can be replaced as:

[0107] [ka]

[0108] In equation (11), [ka] However, respectively, [ka] If replaced by, equations (3-4) can also be updated by equation (11). Of course, in equation (11), [ka] teeth, [ka] For each layer l, the UE [ka] Alternatively, [ka] Therefore, [ka] does not need to be reported by the UE.

[0109] Method 8: [ka] and then equation (1) can be replaced as: [ka]

[0110] For each layer l, the UE [ka] Alternatively, [ka] Therefore, [ka] does not need to be reported by the UE.

[0111] Method 9: [ka] and then equation (1) can be replaced as:

[0112] [ka]

[0113] Method 10: [ka] and then equation (1) can be replaced as:

[0114] [ka]

[0115] Method 11: [ka] and then equation (1) can be replaced as:

[0116] [ka]

[0117] Method 12: [ka] and then equation (1) can be replaced as:

[0118] [ka]

[0119] In the above methods 1 to 12, the compound represented by any one of formulas (5 to 16) [ka] However, respectively, [ka] If replaced by, equations (3-4) can also be updated by any of equations (5-16). Of course, in equations (5-16), [ka] teeth, [ka] can be replaced by one of

[0120] In the above methods 1 to 12, the UE: [ka] The UE should report the index of the strongest coefficient for each layer l, such as i * ,x * ,f * Alternatively, the UE reports i * It only reports information about x * or f * At least one of the x does not need to be reported by the UE. * = 0, and / or f * Define =0.

[0121] moreover, [ka] In that case, [ka] does not need to be fed back to the gNB, or [ka] Only the data does not need to be fed back to the gNB, [ka] needs to be fed back to the gNB, i.e., the remaining [ka] All of this is based on the standard [ka] It does not need to be normalized by

[0122] moreover, [ka] does not need to be fed back to the gNB.

[0123] In the above methods 1 to 12, [ka] are the amplitude coefficients and their phase is zero. [ka] is between 0 and 1 inclusive. [ka] are the phase coefficients, and their amplitude is 1. [ka] The coefficient a l,i,f,x To report, the UE [ka] Report at least one of the following:

[0124] For each layer, [ka] To report the bitmap, the UE reports a bitmap for each layer using L*M*X bits. If a bit in the bitmap indicates a value of 1, then the bit [ka] is in the CSI and reported to the gNB, otherwise, the bit [ka] is not included in the CSI, and its corresponding [ka] Define

[0125] For the relationship between the bitmaps of M and X, the total number of 1s in the bitmap for each x=0, 1, 2, ..., X-1 can be less than or equal to one threshold. The total number of 1s in the bitmap can be less than or equal to one threshold.

[0126] In some implementations, a UE may report Q sets of CQIs in one CSI report, where Q is greater than 1. Different sets of CQIs correspond to different second-type time-domain units. Different CQIs within one set of CQIs correspond to different codewords or different frequency-domain units.

[0127] In some implementations, Q is less than or equal to C4.

[0128] In some implementations, one second-type time domain unit includes one or more first-type time domain units. As shown in Figure 3, one second-type time unit includes two first-type time domain units, in which case: [ka] When C4 is an odd value, the last or first second-type time domain unit may include only first-type time domain units. When the CQI is wideband, the CQI is based on two sets of precoding matrices in two first-type time domain units included in one second-type time domain unit corresponding to the CQI. When the CQI is subband, the CQI is based on two precoding matrices in two first-type time domain units included in one second-type time domain unit corresponding to the CQI, and the two precoding matrices correspond to one subband of the CQI.

[0129] For example, the UE obtains C4 precoding matrix sets for C4 first-type time domain units, each of the C4 precoding matrix sets corresponding to one of the C4 first-type time domain units, and Q CQI sets for Q second-type time domain units.

[0130] In some implementations, the Q sets of CQIs can be reported using a differential method. The Q sets of CQIs correspond to one reference CQI. Other CQIs in the Q sets of CQIs are reported using differential values ​​with reference to the reference CQI. The UE also needs to report an index of the second time domain unit corresponding to the reference CQI. In another implementation, the reference CQI corresponds to a second time domain unit having a predetermined index, such as index 0. The UE does not report an index of the second time domain unit corresponding to the reference CQI.

[0131] In another implementation, each of the Q sets of CQIs can be reported using a differential method, where the Q sets of CQIs correspond to Q reference CQIs, each of which corresponds to one of the Q sets of CQIs.

[0132] In some implementations, different sets of the Q sets of CQIs may include different numbers of CQIs. For example, for a second-type time-domain unit that includes at least one of the transmission opportunities for the P CSI-RS ports corresponding to a CQI, the set of CQIs for the second-type time-domain unit includes a subband CQI. However, for a second-type time-domain unit that does not include a transmission opportunity for the P CSI-RS ports corresponding to a CQI, the set of CQIs for the second-type time-domain unit does not include a subband CQI and includes only a wideband CQI.

[0133] In some implementations, [ka] where C1 is the number of CSI-RS transmission opportunities in a burst corresponding to a CSI report including at least one of PMI and CQI. q is the number of CSI-RS transmission opportunities in one second-type time domain unit. q is an integer greater than 0. The UE reports CQI only for the second-type time domain units that include q CSI-RS transmission opportunities, excluding one or two second-type time domain units that include at least one but less than q CSI-RS transmission opportunity.

[0134] Similarly, the UE may report R values ​​of RI (rank indicator) in one CSI report, where R is greater than 1. Different values ​​of the R values ​​of RI correspond to different third-type time domain units. Each full layer (or column) of the C4*N3 precoding matrix is ​​determined by one of the R values ​​of RI. For example, one RI is the first RI of the first-type time domain unit having index 0 or the first CSI-RS transmission opportunity. In some implementations, one RI may be the maximum of the R values ​​of RI. For a third-type time domain unit, each column of the C5*N3 precoding matrix indicated by the PMI may be different from the RI of the third-type time domain unit, and in that case, the CQI of the third-type time domain unit is based on each RI column of the precoding matrix of the third-type time domain unit indicated by the PMI and the indicated RI of the third-type time domain unit. C5 is the number of C4 first-type time domain units in one third-type time unit. For example, the PMI indicates a C4*N3 precoding matrix for C4 first-type area units, where each of the C4*N3 precoding matrices includes four columns, each corresponding to one layer. [ka] For a third-type time domain unit whose RI value is not equal to 4, the UE obtains a CQI for each second-type time domain unit of the third-type time domain unit according to the RI value of each column of the C5*N3 precoding matrix of the third-type time domain unit. For example, for a third-type time domain unit with index 1, the indicated RI is 3, and the UE obtains a CQI for each second-type time domain unit of the third-type time domain unit with index 1 according to three columns out of each four columns of the precoding matrix of the third-type time domain unit. The three columns out of the four columns may be the first three columns out of the four columns or may be indicated by information included in the CSI.

[0135] In some implementations, one third-type time domain unit contains one or more second-type time domain units. If one third-type time domain unit contains one second-type time domain unit, the third-type time domain unit is equal to the second-type time domain unit, i.e., the second and third-type time domain units are the same type of time unit.

[0136] In some implementations, the third type of time unit is equal to duration T3, and R=1.

[0137] In some implementations, the C4 first-type time units, the Q second-type time domain units, and the R second-type time domain units are all within the duration T3.

[0138] In some implementations, the second type of time unit is equal to duration T3 and Q=1.

[0139] In short, the UE may report at least one of the PMI, Q sets of CQI, or R values ​​of RI in one CSI report.

[0140] Each of the Q sets of CQIs corresponds to one second-type time domain unit. The Q sets of CQIs are for the Q second-type time domain units. The R values ​​of RI correspond to R third-type time domain units. Each of the R values ​​of RI corresponds to one of the R third-type time domain units. The PMI indicates C4 sets of precoding matrices for the C4 first-type time domain units. Each of the C4 sets includes N3 precoding matrices, where Q, R, and C4 are integers greater than 0, and / or at least one of Q, R, and C4 is greater than 1.

[0141] In some implementations, C4≧Q≧R.

[0142] In some implementations, the CSI report should be composed of CMR (a channel metric such as P CSI-RS ports) (or CMR+IMR (an interference metric)) and TRS or SSB. The UE obtains CSI based on at least one of CMR (or CMR+IMR) and TRS or SSB (synchronization signal block). In the following, an example of TRS is given, but this also applies to SSB.

[0143] F x , f x , F x ’ , or f x ’ To obtain an estimate of the Doppler shift or Doppler spread, such as l,i,f,x ) and spatial domain vector set (v j ) and frequency domain vector selection ( [ka] To obtain the TRS and CSI-RS, more time opportunities of the CSI-RS are needed, and the reported CSI may be more accurate. The measurement metrics for the TRS and CSI-RS are different.

[0144] For example, the measurement metric for TRS is F x , f x , F x ’ , or f x ’ It requires a higher density of time domain samples, which can be obtained as long as at least one path is unblocked. The phase change between two TRS symbols should not be greater than π or 2π. For example, F x Δt ≤ π, or F x Δt≦2π, where Δt is the time gap between two TRS symbols.

[0145] The measurement metric of CSI-RS is determined by the selection of the spatial domain vector (e.g., the first type vector) and the frequency domain vector (e.g., the second type vector) and the weighting coefficient a as shown in Equations 1 to 12. l,i,f,x Considering that some paths may be blocked in some cases, or considering interference bursts, more time opportunities are needed.

[0146] Option 1: TRS and CSI-RS have the same period, and TRS is denser than CSI-RS in one slot. One CSI-RS reporting period includes one CSI-RS period and one period TRS.

[0147] Option 2: The CSI-RS and TRS periods can be the same. One CSI-RS period includes C1 CSI-RS transmission opportunities and C R The TRS transmission opportunities are higher density than the CSI-RS in a slot, and there are more than one CSI-RS transmission opportunities in a CSI-RS period. The C1 CSI-RS transmission opportunities are within one burst of P CSI-RS. R The TRS transmission opportunity is within one burst. RThe gap between consecutive TRS transmission opportunities for C1 is smaller than the gap between consecutive CSI-RS transmission opportunities for C1. R In some implementations, the burst containing C1 CSI-RS transmission opportunity for the P CSI-RS ports is C R TRS transmission opportunities longer than the burst containing them.

[0148] Option 3: One CSI-RS period consists of CSI-RS resources of C1 and C R The CSI-RS resources of C1 have relationships such as the same number of CSI-RS ports, one-to-one mapping between CSI-RS ports, and the same period. However, the CSI-RS resources of C1 may require more description to clarify that the CSI is based on the CSI-RS resources of C1. The N TRS resources have relationships. One CSI-RS period corresponds to one CSI report. The M CSI-RS transmission opportunities can be distributed equally / unequal.

[0149] Option 4: CSI-RS and TRS are the same signal.

[0150] Option 5: One of the CSI-RS ports is a TRS.

[0151] In the above description, the CSI is determined according to the P CSI-RS ports received on multiple transmission opportunities in one period for the P CSI-RS ports, and the gNB needs to configure information about the multiple transmission opportunities for the P CSI-RS ports.

[0152] In a first implementation, the multiple transmission opportunities correspond to one CSI-RS resource that includes P CSI-RS ports.

[0153] The gNB needs to configure information about multiple transmission opportunities for one CSI-RS resource by configuring at least one of the OFDM symbol index of the starting transmission opportunity, the number of transmission opportunities, the OFDM symbol gap between two consecutive transmission opportunities, the slot gap between two consecutive transmission opportunities, a set of slot offsets, an OFDM symbol index for each transmission opportunity, and a set of OFDM symbol gaps.

[0154] For example, the UE may configure multiple transmission opportunities using one or more of the following methods 1-6.

[0155] Method 1: The gNB configures the OFDM symbol at which a transmission opportunity starts, the number of transmission opportunities, and the OFDM symbol gap between two consecutive transmission opportunities, and then the UE can obtain multiple transmission opportunities. One transmission opportunity can include one or more OFDM symbols, and different OFDM symbols of one transmission opportunity include different CSI-RS ports of one CSI-RS resource.

[0156] Method 2: The gNB configures a set of OFDM symbol index and slot offset for a starting transmission opportunity for one CSI-RS resource. Multiple transmission opportunities for one CSI-RS resource are in different slots and OFDM symbols with the same index. For example, the first transmission opportunity is in {OFDM symbol 1 and OFDM symbol 4} of slot n1 indicated by the first entry in the slot offset set, and the second transmission opportunity is in {OFDM symbol 1 and OFDM symbol 4} of slot n2 indicated by the first entry in the slot offset set.

[0157] Method 3: The gNB configures the OFDM symbol index of the starting transmission opportunity and the number of transmission opportunities for one CSI-RS resource. The multiple transmission opportunities are in consecutive slots and have the same OFDM symbol index. Alternatively, the multiple transmission opportunities are in consecutive available slots and have the same OFDM symbol index. The symbol of one CSI-RS resource in one available slot is an available symbol. For example, it is not an uplink symbol, a symbol for the PRACH (Physical Random Access Channel), or a symbol for SSB.

[0158] Method 4: The gNB configures the OFDM symbol index of the start of a transmission opportunity, the slot gap, and the number of transmission opportunities for one CSI-RS resource. The transmission opportunities are in different slots with the same OFDM symbol index. The slot gap between two consecutive transmission opportunities is the indicated slot gap.

[0159] Method 5: The gNB configures an OFDM symbol index for each transmission opportunity, and the gap between two transmission opportunities can be different for two different consecutive transmission opportunities. For example, the gap between transmission opportunities 1 and 2 is three OFDM symbols, while the gap between transmission opportunities 2 and 3 is two OFDM symbols. The offset of the two OFDM symbols can be different for different transmission opportunities. For example, the first transmission opportunity can be {OFDM1 and OFDM4} within one slot, and the second transmission opportunity can be {OFDM5 and OFDM6} within the same slot.

[0160] Method 6: The gNB configures an OFDM symbol index to start a set of transmission opportunities and OFDM symbol gaps. The gap between two consecutive transmission opportunities can then be different for different consecutive transmission opportunities, but the offset between the two OFDM symbols of one OFDM symbol is the same. The OFDM symbol gap between the first and second transmission opportunities is the first entry in the set of OFDM symbol gaps. The OFDM symbol gap between the second and third transmission opportunities is the second entry in the set of OFDM symbol gaps, and so on.

[0161] The gNB may configure one CSI-RS resource for the UE, and the UE obtains CSI based on the configured CSI-RS resource. The CSI does not include a CRI. Alternatively, the gNB configures a set of CSI-RS resources having multiple CSI-RS resources, each having multiple transmission opportunities configured by one of Methods 1 to 6. The UE selects one CSI-RS resource and obtains CSI based on the selected CSI-RS resource, and the CSI includes a CRI indicating the selected CSI-RS resource.

[0162] In a second implementation, the gNB configures multiple opportunities for P's CSI-RS port using multiple CSI-RS resources, where each transmission opportunity corresponds to a CSI-RS resource. Different transmission opportunities correspond to different transmission opportunities. The multiple transmission opportunities can be in one or more CSI-RS resource sets. If they are in two or more CSI-RS resource sets, each set corresponds to a period and slot offset, and the CSI is based on one configuration of the CSI-RS resource sets, and one CSI-RS resource configuration includes one or more CSI-RS resource sets. The gNB can directly configure one CSI-RS configuration to allow the UE to acquire CSI. Alternatively, the gNB can configure multiple CSI-RS configurations, where if they are all in one CSI-RS resource set, one set can correspond to one period and two or more slot offsets. Each CSI-RS resource can be configured with an on-slot offset. The multiple CSI-RS resources satisfy some restrictions. The restrictions include that some parameters must be the same for these CSI-RS resources within a CSI-RS resource set, including at least one of the number of CSI-RS ports, RB location, bandwidth, or duration, and further that these CSI-RS resources within a CSI-RS resource set are quasi-co-located and QCLed with QCL Type A and QCL Type D, respectively, if applicable. Different CSI-RS resources within a CSI-RS resource set are within different time-domain symbols within one slot or different slots.

[0163] If one transmission opportunity for a CSI-RS port of P includes two or more OFDM symbols and different OFDM symbols of one transmission opportunity include different CSI-RS ports of P, the gap between two transmission opportunities is the gap between the starting OFDM symbols of two consecutive transmissions. One transmission opportunity can be within one slot or multiple slots. Alternatively, one transmission opportunity can be limited to only one slot. In some implementations, the starting symbol of a later transmission opportunity is after the end of the previous transmission opportunity. For example, if the first transmission opportunity includes OFDM symbol 1 containing CSI-RS ports {0-7} and OFDM symbol 4 containing CSI-RS ports {8-15} in slot n, the second transmission should start at OFDM symbol 9 in slot n, with a gap of 5, and so on. Then the second transmission opportunity includes OFDM symbols {OFDM6, OFDM9}. In another implementation, the starting symbol of the later transmission opportunity is after the start of the previous transmission opportunity, and the two transmission opportunities should not be within one same symbol, i.e., the gap is not equal to an offset of two OFDM symbols of one transmission opportunity, such as a gap of 2, and the second transmission opportunity includes {OFDM3, OFDM6}. In a third implementation, the starting symbol of the later transmission opportunity is after the start of the previous transmission opportunity, and the two transmission opportunities can be within one same symbol, i.e., the gap can be equal to an offset of two OFDM symbols of one transmission opportunity, such as a gap of 3, and the second transmission opportunity includes {OFDM4, OFDM7}.

[0164] One CRI corresponds to one CSI-RS resource, one CSI-RS resource set, or one CSI-RS resource configuration.

[0165] The UE reports its capabilities regarding at least one of the following: the number of CSI-RS transmission opportunities in a burst for the P CSI-RS ports used to generate the PMI, e.g., C1; the number of elements in one third-type vector, e.g., a C4 value; and the number of elements in one second-type vector, e.g., N3, L, M, or X values. That is, the UE reports the maximum supported value of C1. This is because the UE needs to obtain the actual precoding matrix for each transmission opportunity and the PMI for the N4 first-type time-domain units. This requires a UE capability report. In some implementations, the UE reports its capabilities regarding a supported value set for at least one of C1, C4, N3, L, M, or X. For example, the UE reports that its supported value set for C1 is {4, 8, 16}. In some implementations, the UE reports its capabilities regarding the maximum supported value for at least one of C1, C4, N3, L, M, or X.

[0166] In some implementations, the UE reports capability C1.

[0167] Example 2

[0168] For power allocation between panels and panel selection, the UE needs to feed back RSRP (Reference Signal Received Power) or RSRP offset to the gNB. There are the following methods to report this information:

[0169] In some implementations, the gNB configures a set of CSI-RS / SSB resource sets, and the UE reports its selected CRI and corresponding RSRP / SINR (signal-to-interference-and-noise ratio). The maximum number of reported (CRI, RSRP) pairs needs to be extended, e.g., to be greater than 4.

[0170] In some implementations, the UE reports multiple pairs of (CRI, RSRP), where the reported values ​​are relative values. [ka] RSRP max corresponds to the first reported CRI / SSBRI, and RSRP 0,relative In another implementation, the UE may report RSRP for the first CRI to the gNB. max Absolute values ​​of CRI / SSBRI and other reported relative values ​​of RSRP i,relative , i=1,2,…,E-1, where E is the amount of CRI / SSBRI reported.

[0171] In some implementations, the UE reports the RSRP or relative value of each CRI, does not report the CRI, and reports only the RSRP / relative RSRP. For example, the UE reports the absolute value of the RSRP / relative RSRP for each CSI-RS resource / SSB resource in the candidate set.

[0172] In some implementations, the UE reports E CRI / SSBRI and one combined RSRP / SINR, e.g., the UE reports E CRI / SSBRI and one RSRP (or SINR), where the one RSRP / SINR corresponds to E's reported CRI / SSBRI and combined RSRP.

[0173] Various preferred solutions adopted by the embodiments are listed below.

[0174] One solution includes a method of wireless communication (e.g., method 400 shown in FIG. 4 ), comprising: determining, by a first communication device, channel state information CSI corresponding to P ports (402), where P is a positive integer; and transmitting, by the first communication device, the CSI to a second communication device (404), wherein the CSI includes at least one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, or R values ​​of rank indicator RI, wherein one set of PMI indicates a set of C4 precoding matrices corresponding to C4 time domain units of a first type, the Q sets of CQIs correspond to Q time domain units of a second type, and the R values ​​of RI correspond to R time domain units of a third type, and Q, R, and C4 are positive integers.

[0175] The first communication device may be a first base station or a first UE.

[0176] The second communication device may be a second base station or a second UE.

[0177] Another solution includes a method of wireless communication (e.g., method 800 shown in FIG. 8 ), comprising receiving channel state information CSI corresponding to P ports from a first communication device by a second communication device (802), where P is a positive integer, and the CSI includes at least one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, or R values ​​of rank indicator RI, where one set of PMI indicates a set of C4 precoding matrices corresponding to C4 time domain units of a first type, the Q sets of CQIs correspond to Q time domain units of a second type, and the R values ​​of RI correspond to R time domain units of a third type, and Q, R, and C4 are positive integers.

[0178] Another solution includes a method of wireless communication (e.g., method 500 shown in FIG. 5 ), comprising: receiving, by a first communication device, from a second communication device, a signal transmission including transmission of a first reference signal and a second reference signal according to a pattern (502); and transmitting, by the first communication device, to the second communication device, channel state information according to the first reference signal and the second reference signal (504).

[0179] The wireless communication device feeds back one set of precoding matrix indicators (PMIs). One set of PMIs indicates a set of C4 precoding matrices corresponding to C4 first-type time-domain units. One set of PMIs is applied to each precoding matrix in the set of C4 precoding matrices. It captures the frequency-domain and time-domain characteristics of the channel. All precoding matrices share the same information indicated by one set of PMIs. This reduces CSI overhead and allows the second communication device to obtain more accurate CSI because the PMI employs the frequency-domain and time-domain characteristics of the channel and proposes a model, and the PMI includes only some parameters of the model. This document also reports RI / CQI for multiple time-domain units in one CSI report. This allows the second communication device to schedule with high flexibility based on the reported CSI.

[0180] Another solution includes a method of wireless communication (e.g., method 900 shown in FIG. 9 ), comprising: receiving, by a first communication device, from a second communication device, a signal transmission including transmission of a first reference signal and a second reference signal according to a pattern (902); and transmitting, by the first communication device, channel state information to the second communication device according to the first reference signal and the second reference signal (904).

[0181] FIG. 6 shows an exemplary block diagram of a hardware platform 700 that may be part of a network device (e.g., a base station) or a communication device (e.g., a network node or user equipment (UE)). The hardware platform 700 includes at least one processor 710 and a memory 705 having instructions stored thereon. In some embodiments, the memory 705 may be omitted or may be internal to the processor 710. The instructions executed by the processor 710 configure the hardware platform 700 to perform the operations described in FIGS. 1 through 8 and in various embodiments described in this patent document. The transmitter 715 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user equipment. The receiver 720 receives information or data transmitted or sent by another device. For example, a user equipment can receive a message from a network device.

[0182] The above-described implementations are applied to wireless communication. Figure 7 shows an example of a wireless communication system (e.g., a 5G or NR cellular network) including a base station 820 and one or more user equipments (UEs) 811, 812, and 813. In some embodiments, the UE accesses a BS (e.g., a network) using a communication link to the network (as indicated by dashed arrows 831, 832, and 833, sometimes referred to as the uplink direction), which then enables subsequent communication from the BS to the UE (as indicated by arrows 841, 842, and 843, sometimes referred to as the downlink direction, which is shown in the network-to-UE direction). In some embodiments, the BS sends information to the UE (as indicated by arrows 841, 842, and 843, sometimes referred to as the downlink direction), which then enables subsequent communication from the UE to the BS (as indicated by dashed arrows 831, 832, and 833, sometimes referred to as the uplink direction, which is shown in the UE-to-BS direction). The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine-to-machine (M2M) device, an Internet of Things (IoT) device, etc.

[0183] From the foregoing, it will be appreciated that, although specific embodiments of the technology of the present disclosure have been described herein for purposes of illustration, various modifications may be made without departing from the scope of the invention. Accordingly, the technology of the present disclosure is not to be limited except as by the appended claims.

[0184] The disclosed and other embodiments, modules, and functional operations described herein can be implemented in digital electronic circuitry, or in computer software, firmware, or hardware, including the structures disclosed herein and their structural equivalents, or in one or more combinations thereof. The disclosed and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer-readable medium for execution by or controlling the operation of a data processing apparatus. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter providing a machine-readable propagated signal, or one or more combinations thereof. The term "data processing apparatus" encompasses all apparatuses, devices, and machines for processing data, including, by way of example, a programmable processor, a computer, or multiple processors or computers. In addition to hardware, an apparatus can include code that creates an execution environment for the computer program in question, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or one or more combinations thereof. A propagated signal is an artificially generated signal, such as a machine-generated electrical, optical, or electromagnetic signal, generated to encode information for transmission to an appropriate receiving apparatus.

[0185] A computer program (also known as a program, software, software application, script, or code) can be written in any form of programming language, including compiled or interpreted languages, and can be deployed in any form, including as a stand-alone program or as modules, components, subroutines, or other units suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored as part of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to the program in question, or in multiple cooperating files (e.g., files storing one or more modules, subprograms, or portions of code). A computer program can be deployed to be executed on one computer or on multiple computers located at one site or distributed across multiple sites and interconnected by a communications network.

[0186] The processes and logic flows described herein may be performed by one or more programmable processors executing one or more computer programs to perform functions by manipulating input data and generating output. The processes and logic flows may also be performed by, and an apparatus may also be implemented as, special purpose logic circuitry, such as, for example, an FPGA (field programmable gate array) or an ASIC (application-specific integrated circuit).

[0187] Processors suitable for executing a computer program include, by way of example, both general-purpose and special-purpose microprocessors, and any one or more processors of any kind of digital computer. Typically, a processor receives instructions and data from a read-only memory or a random-access memory, or both. The essential elements of a computer are a processor for executing instructions and one or more memory devices for storing instructions and data. Typically, a computer also includes one or more mass storage devices for storing data, such as magnetic, magneto-optical, or optical disks, or is operatively coupled to receive data from or transfer data to them, or both. However, a computer need not have such devices. Computer-readable media suitable for storing computer program instructions and data include, by way of example, all forms of non-volatile memory, media, and memory devices, including, by way of example, semiconductor memory devices such as EPROMs, EEPROMs, and flash memory devices; magnetic disks, such as internal or removable disks; magneto-optical disks; and CD-ROM and DVD-ROM disks. The processor and memory can be supplemented by, or incorporated in, special-purpose logic circuitry.

[0188] While this patent document contains many details, these should not be construed as limitations on the scope of any invention or what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of a particular invention. Any features described in this patent document in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, while features may be described above as acting in particular combinations and initially claimed as such, one or more features from a claimed combination may, in some cases, be cut from the combination, and the claimed combination may be directed to a subcombination or a variation of the subcombination.

[0189] Similarly, although operations are shown in the figures in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown, or in any sequential order, or that all of the operations shown be performed, to achieve desirable results. Further, the separation of various system components in the embodiments described in this patent document should not be understood as requiring such separation in all embodiments.

[0190] Only some implementations and examples have been described; other implementations, extensions and variations can be made based on what is described and illustrated in this patent document.

Claims

1. 1. A method of wireless communication, said method comprising: The first communication device determines channel state information CSI corresponding to P channel state information reference signal (CSI-RS) ports, where P is a positive integer; the first communication device transmitting the CSI to a second communication device in a CSI report; Including, The CSI in the one CSI report includes one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, and R values ​​of rank indicator RI; One set of the PMIs is C ４ C corresponding to the first type time domain units ４ a set of Q precoding matrices, the Q sets of CQIs having a one-to-one correspondence to the Q second-type time domain units, Q being greater than 1, and the R values ​​of RI corresponding to the R third-type time domain units; Q, R, C ４ is a positive integer, Q, R, C ４ At least one of is greater than 1, and C ４ ≧Q≧R, one of the R third-type time domain units includes one or more second-type time domain units, one of the R third-type time domain units includes one or more first-type time domain units, and one of the Q second-type time domain units is one of the C ４ one or more of a first type of time domain units; Said C ４ each of the first type of time units corresponds to one or more slots; One set of the PMI includes information about one first-type vector set, information about v second-type vector sets, information about D third-type vector sets, and indices of the strongest coefficient and E coefficients, where v is the total number of layers, and D and E are positive integers; or Each precoding matrix of the set of C 4 precoding matrices is based on three types of vector sets, including a first type vector set, a second type vector set, and a third type vector set. At least one of each first-type vector includes P / 2 elements, the P / 2 elements of one first-type vector having the same amplitude, and each of the P / 2 elements having a respective phase; each second type vector includes N 3 elements, each of the N 3 elements corresponding to one frequency domain unit k; The k-th element of each second type vector is [Number 1-1] It has the format f is [Number 2-1] is an index of a corresponding second type vector corresponding to one value of A method wherein each third-type vector includes C 4 elements, each of said C 4 elements corresponding to one of said C 4 first-type time-domain units.

2. Said C ４ Precoding matrix W of a set of precoding matrices ｋ，ｔ The lth column of [Equation 4] teeth, [Equation 5] is specified as [Equation 6] is the precoding matrix W of frequency domain unit k ｋ，ｔ where the first type of time domain unit corresponds to t and layer l, [Number 6-1] and ν ｉ is a first type vector in a first type vector set, i∈{0, 1, ..., L-1}, [Equation 7] is the k-th element of the second-type vector with index f in the set of second-type vectors, [Equation 8] is the element corresponding to t of the third-type vector with index x in the third-type vector set specific to layer l, and a ｌ，ｉ，ｆ，ｘ is a value having a phase and an amplitude, and a ｌ，ｉ，ｆ，ｘ The amplitude of is 1 or less, and t is the ４ a time-domain index corresponding to one of the first-type time-domain units, [Number 8-1] is unique to the first type vector set and the second type vector set, and is shared by all first type vectors in the first type vector set and all second type vectors in the second type vector set. 【Request Item 3】 【Number 50】 and [Equation 51] are the amplitude coefficients, whose phase is zero, [Number 52] is greater than or equal to 0 and less than or equal to 1, [Number 53] are the phase coefficients whose amplitude is 1 for l=0, 1, ..., v-1, i=0, 1, ..., 2*L-1, f=0, 1, ..., M-1, x=0, 1, ..., X-1, One set of the PMI includes a set of v indices, each of which corresponds to the strongest coefficient a of the corresponding layer. ｌ，ｉ，ｆ，ｘ and each of the sets of v indices corresponds to [Number 54] The method of claim 2 , comprising:

4. One of the D third type vector sets is specific to one layer, where D is equal to ν, and each of the D third type vector sets is ４ is used to determine a column of each precoding matrix of the set of precoding matrices; One third type of vector with index x is f ｘ ’’ and the C ４ and a time-domain index corresponding to one of the first-type time-domain units, ｘ ’’ The method of claim 1 , wherein the unit of is one subcarrier space.

5. 1. A method of wireless communication, said method comprising: receiving, from the first communication device, channel state information CSI corresponding to P channel state information reference signal (CSI-RS) ports in one CSI report, where P is a positive integer; the second communication device performing communication with the first communication device according to the CSI; Including, The CSI in the one CSI report includes one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, and R values ​​of rank indicator RI; One set of the PMIs is C ４ C corresponding to the first type time domain units ４ a set of Q precoding matrices, the Q sets of CQIs having a one-to-one correspondence to the Q second-type time domain units, Q being greater than 1, and the R values ​​of RI corresponding to the R third-type time domain units; Q, R, C ４ is a positive integer, Q, R, C ４ At least one of is greater than 1, and C ４ ≧Q≧R, one of the R third-type time domain units includes one or more second-type time domain units, one of the R third-type time domain units includes one or more first-type time domain units, and one of the Q second-type time domain units is one of the C ４ one or more of a first type of time domain units; Said C ４ each of the first type of time units corresponds to one or more slots; One set of the PMI includes information about one first-type vector set, information about v second-type vector sets, information about D third-type vector sets, and indices of the strongest coefficient and E coefficients, where v is the total number of layers, and D and E are positive integers; or Each precoding matrix of the set of C 4 precoding matrices is based on three types of vector sets, including a first type vector set, a second type vector set, and a third type vector set. At least one of each first-type vector includes P / 2 elements, the P / 2 elements of one first-type vector having the same amplitude, and each of the P / 2 elements having a respective phase; each second type vector includes N 3 elements, each of the N 3 elements corresponding to one frequency domain unit k; The k-th element of each second type vector is [Number 55-1] It has the format f is [Number 56-1] is an index of a corresponding second type vector corresponding to one value of A method wherein each third-type vector includes C 4 elements, each of said C 4 elements corresponding to one of said C 4 first-type time-domain units.

6. Said C ４ Precoding matrix W of a set of precoding matrices ｋ，ｔ The lth column of [Number 57] teeth, [Number 58] is specified as [Number 59] is the precoding matrix W of frequency domain unit k ｋ，ｔ where the first type of time domain unit corresponds to t and layer l, [Number 59-1] and ν ｉ is a first type vector in a first type vector set, i∈{0, 1, ..., L-1}, [Number 60] is the k-th element of the second-type vector with index f in the set of second-type vectors, [Number 61] is the element corresponding to t of the third-type vector with index x in the third-type vector set specific to layer l, and a ｌ，ｉ，ｆ，ｘ is a value having a phase and an amplitude, and a ｌ，ｉ，ｆ，ｘ The amplitude of is 1 or less, and t is the ４ a time-domain index corresponding to one of the first-type time-domain units, [Number 61-1] is unique to the first type vector set and the second type vector set, and is shared by all first type vectors in the first type vector set and all second type vectors in the second type vector set. 【Request Item 7】 【Number 62】 and [Number 63] are the amplitude coefficients, whose phase is zero, [Number 64] is greater than or equal to 0 and less than or equal to 1, [Number 65] are the phase coefficients whose amplitude is 1 for l=0, 1, ..., v-1, i=0, 1, ..., 2*L-1, f=0, 1, ..., M-1, x=0, 1, ..., X-1, One set of the PMI includes a set of v indices, each of which corresponds to the strongest coefficient a of the corresponding layer. ｌ，ｉ，ｆ，ｘ and each of the sets of v indices corresponds to [Number 66] The method of claim 6, comprising:

8. One of the D third type vector sets is specific to one layer, where D is equal to ν, and each of the D third type vector sets is ４ is used to determine a column of each precoding matrix of the set of precoding matrices; One third type of vector with index x is f ｘ ’’ and the C ４ and a time-domain index corresponding to one of the first-type time-domain units, ｘ ’’ The method of claim 5 , wherein the unit of is one subcarrier space.

9. 1. A communications device comprising at least one processor, The at least one processor determining channel state information CSI corresponding to P channel state information reference signal (CSI-RS) ports, where P is a positive integer; transmitting the CSI to a second communication device in a CSI report; and The CSI in the one CSI report includes one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, and R values ​​of rank indicator RI; One set of the PMIs is C ４ C corresponding to the first type time domain units ４ a set of Q precoding matrices, the Q sets of CQIs having a one-to-one correspondence to the Q second-type time domain units, Q being greater than 1, and the R values ​​of RI corresponding to the R third-type time domain units; Q, R, C ４ is a positive integer, Q, R, C ４ At least one of is greater than 1, and C ４ ≧Q≧R, one of the R third-type time domain units includes one or more second-type time domain units, one of the R third-type time domain units includes one or more first-type time domain units, and one of the Q second-type time domain units is one of the C ４ one or more of a first type of time domain units; Said C ４ each of the first type of time units corresponds to one or more slots; One set of the PMI includes information about one first-type vector set, information about v second-type vector sets, information about D third-type vector sets, and indices of the strongest coefficient and E coefficients, where v is the total number of layers, and D and E are positive integers; or Each precoding matrix of the set of C 4 precoding matrices is based on three types of vector sets, including a first type vector set, a second type vector set, and a third type vector set. At least one of each first-type vector includes P / 2 elements, the P / 2 elements of one first-type vector having the same amplitude, and each of the P / 2 elements having a respective phase; each second type vector includes N 3 elements, each of the N 3 elements corresponding to one frequency domain unit k; The k-th element of each second type vector is [Number 67-1] It has the format f is [Number 68-1] is an index of a corresponding second type vector corresponding to one value of A communications device, wherein each third-type vector includes C 4 elements, each of said C 4 elements corresponding to one of said C 4 first-type time domain units.

10. Said C ４ Precoding matrix W of a set of precoding matrices ｋ，ｔ The lth column of [Number 69] teeth, [Number 70] is specified as [Number 71] is the precoding matrix W of frequency domain unit k ｋ，ｔ where the first type of time domain unit corresponds to t and layer l, [Number 71-1] and ν ｉ is a first type vector in a first type vector set, i∈{0, 1, ..., L-1}, [Number 72] is the k-th element of the second-type vector with index f in the set of second-type vectors, [Number 73] is the element corresponding to t of the third-type vector with index x in the third-type vector set specific to layer l, and a ｌ，ｉ，ｆ，ｘ is a value having a phase and an amplitude, and a ｌ，ｉ，ｆ，ｘ The amplitude of is 1 or less, and t is the ４ a time-domain index corresponding to one of the first-type time-domain units, [Number 73-1] 10. The communication device of claim 9, wherein is unique to the first type vector set and the second type vector set, and is shared by all first type vectors in the first type vector set and all second type vectors in the second type vector set. [Request Item 11] [Number 74] and [Number 75] are the amplitude coefficients, whose phase is zero, [Number 76] is greater than or equal to 0 and less than or equal to 1, [Number 77] are the phase coefficients whose amplitude is 1 for l=0, 1, ..., v-1, i=0, 1, ..., 2*L-1, f=0, 1, ..., M-1, x=0, 1, ..., X-1, One set of the PMI includes a set of v indices, each of which corresponds to the strongest coefficient a of the corresponding layer. ｌ，ｉ，ｆ，ｘ and each of the sets of v indices corresponds to [Number 78] The communication device of claim 10, comprising:

12. One of the D third type vector sets is specific to one layer, where D is equal to ν, and each of the D third type vector sets is ４ is used to determine a column of each precoding matrix of the set of precoding matrices; One third type of vector with index x is f ｘ ’’ and the C ４ and a time-domain index corresponding to one of the first-type time-domain units, ｘ ’’ The communication device of claim 9 , wherein the unit of is one subcarrier space.

13. 1. A communications device comprising at least one processor, The at least one processor receiving, from a first communication device, channel state information CSI corresponding to P channel state information reference signal (CSI-RS) ports in one CSI report, where P is a positive integer; performing communication with the first communication device according to the CSI; and and The CSI in the one CSI report includes one set of precoding matrix indicators PMI, Q sets of channel quality indicators CQI, and R values ​​of rank indicator RI; One set of the PMIs is C ４ C corresponding to the first type time domain units ４ a set of Q precoding matrices, the Q sets of CQIs having a one-to-one correspondence to the Q second-type time domain units, Q being greater than 1, and the R values ​​of RI corresponding to the R third-type time domain units; Q, R, C ４ is a positive integer, Q, R, C ４ At least one of is greater than 1, and C ４ ≧Q≧R, one of the R third-type time domain units includes one or more second-type time domain units, one of the R third-type time domain units includes one or more first-type time domain units, and one of the Q second-type time domain units is one of the C ４ one or more of a first type of time domain units; Said C ４ each of the first type of time units corresponds to one or more slots; One set of the PMI includes information about one first-type vector set, information about v second-type vector sets, information about D third-type vector sets, and indices of the strongest coefficient and E coefficients, where v is the total number of layers, and D and E are positive integers; or Each precoding matrix of the set of C 4 precoding matrices is based on three types of vector sets, including a first type vector set, a second type vector set, and a third type vector set. At least one of each first-type vector includes P / 2 elements, the P / 2 elements of one first-type vector having the same amplitude, and each of the P / 2 elements having a respective phase; each second type vector includes N 3 elements, each of the N 3 elements corresponding to one frequency domain unit k; The k-th element of each second type vector is [Number 79-1] It has the format f is [Number 80-1] is an index of a corresponding second type vector corresponding to one value of A communications device, wherein each third-type vector includes C 4 elements, each of said C 4 elements corresponding to one of said C 4 first-type time domain units.

14. Said C ４ Precoding matrix W of a set of precoding matrices ｋ，ｔ The lth column of [Number 81] teeth, [Number 82] is specified as [Number 83] is the precoding matrix W of frequency domain unit k ｋ，ｔ where the first type of time domain unit corresponds to t and layer l, [Number 83-1] and ν ｉ is a first type vector in a first type vector set, i∈{0, 1, ..., L-1}, [Number 84] is the k-th element of the second-type vector with index f in the set of second-type vectors, [Number 85] is the element corresponding to t of the third-type vector with index x in the third-type vector set specific to layer l, and a ｌ，ｉ，ｆ，ｘ is a value having a phase and an amplitude, and a ｌ，ｉ，ｆ，ｘ The amplitude of is 1 or less, and t is the ４ a time-domain index corresponding to one of the first-type time-domain units, [Number 85-1] 14. The communication device of claim 13, wherein is unique to the first type vector set and the second type vector set, and is shared by all first type vectors in the first type vector set and all second type vectors in the second type vector set. [Request Item 15] [Number 86] and [Number 87] are the amplitude coefficients, whose phase is zero, [Number 88] is greater than or equal to 0 and less than or equal to 1, [Number 89] are the phase coefficients whose amplitude is 1 for l=0, 1, ..., v-1, i=0, 1, ..., 2*L-1, f=0, 1, ..., M-1, x=0, 1, ..., X-1, One set of the PMI includes a set of v indices, each of which corresponds to the strongest coefficient a of the corresponding layer. ｌ，ｉ，ｆ，ｘ and each of the sets of v indices corresponds to [Number 90] 15. The communication device of claim 14, comprising:

16. One of the D third type vector sets is specific to one layer, where D is equal to ν, and each of the D third type vector sets is ４ is used to determine a column of each precoding matrix of the set of precoding matrices; One third type of vector with index x is f ｘ ’’ and the C ４ and a time-domain index corresponding to one of the first-type time-domain units, ｘ ’’ The communication device of claim 13 , wherein the unit of is one subcarrier space.

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