Reference signal information configuration method and device

Abstract

The present invention provides a method and device for configuring reference signal information, wherein the method includes: obtaining a first information set A and a second information set B, dividing the first information set A and the second information set B into N subsets respectively, and associating the first information set subset Ai and the second information set subset Bi; wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode, redundant version information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the set B belongs to a codeword. By adopting the above technical solution, the first information set and the second information set are obtained, and the two information sets are associated and sent to the communication node of the opposite end, the problem of high overhead of notifying DMRS port configuration information in the related technology is solved, and the overhead of DMRS port configuration information is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a method and device for configuring reference signal information. Background Art

[0002] In the related art, for a demodulation reference signal, if the corresponding data is configured to be sent on the time domain symbol where the demodulation reference signal is located, the power of the demodulation reference signal cannot be enhanced, and a large amount of additional signaling is required to indicate whether the data is sent on the time domain symbol where the demodulation reference signal is located. If the data is never configured to be sent on the time domain symbol where the demodulation reference signal is located, the signaling overhead is reduced, but the transmission efficiency may be reduced.

[0003] At present, the physical layer technology of New Radio (NR) is being hotly discussed in the 3rd Generation Partnership Project (3GPP) RAN1. Flexibility and efficiency have always been the goals pursued by NR physical layer design. And the pursuit of maximum flexibility of physical layer reference signals seems to have become a trend. This is because the requirements for demodulation reference signals may be different in different application scenarios.

[0004] For users with high latency requirements, the user needs to receive downlink data in a time slot and then feed back to the base station a signal indicating whether the downlink data transmission is correct or not. In other words, the downlink physical transmission resources allocated by the base station to the user and the corresponding ACK / NACK (correct / incorrect) feedback indicating whether the user has received the data correctly are in the same time slot. At this time, in order to demodulate quickly, the demodulation reference signal must be placed at the front of the time slot, so that the user can quickly detect the demodulation reference signal for data demodulation. Figure 1 It is based on the DMRS schematic diagram in data transmission in the related art, such as Figure 1 As shown in FIG. 1 , for some users or some services, downlink data transmission and corresponding ACK / NACK feedback are in the same time slot, which can be called a self-contained slot format. This can greatly reduce the delay of ACK / NACK feedback, which is beneficial to the transmission of services with high timeliness requirements. Figure 1 In the time slot, there are 14 OFDM symbols. The base station schedules downlink data to the user through the downlink control channel of the first two symbols, and places the demodulation reference signal on the 3rd and 4th time domain symbols. After detecting the downlink data, the user feeds back ACK / NACK on the last 2 symbols of the time slot. If the user correctly detects the downlink data channel, the user feeds back ACK to the base station, otherwise it feeds back NACK to the base station.

[0005] Generally, in order to support this self-contained time slot structure, the design of demodulation-related reference signals should be as conducive to rapid demodulation as possible, so as to achieve rapid ACK / NACK feedback. For example, the demodulation reference signal is best placed in the first few OFDM symbols of the downlink data channel. We call this demodulation reference signal placed at the front of the time slot a front loaded DMRS.

[0006] For uplink data transmission, since V2V, D2D and other services may also require low latency, the pre-demodulation reference signal is also conducive to fast demodulation and feedback.

[0007] For users or services with low latency requirements, ACK / NACK feedback does not need to be too fast. In this case, ACK / NACK feedback can be several time slots later than the downlink data channel. In this case, the design of the demodulation reference signal is not limited to just the pre-demodulation reference signal. The supplementary demodulation reference signal can also be sent for Doppler estimation. Figure 2 is a schematic diagram of a pre-demodulation reference signal and a supplementary demodulation reference signal in the related art, such as Figure 2 As shown, DMRS is distributed on 4 time domain symbols, which is beneficial to improving Doppler estimation.

[0008] There is currently no effective solution to the problem of high overhead in notifying DMRS port configuration information in the related art. Summary of the invention

[0009] The embodiments of the present invention provide a method and device for configuring reference signal information, so as to at least solve the problem of high overhead in notifying DMRS port configuration information in the related art.

[0010] According to one embodiment of the present invention, a method for configuring reference signal information is provided, the method comprising: acquiring a first information set A and a second information set B, dividing the first information set A and the second information set B into N subsets respectively, and associating the first information set subset Ai and the second information set subset Bi, wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode, redundant version information; and the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the set B belongs to a codeword.

[0011] Optionally, the subsets Bi and Bj of the second information set are different, wherein i is not equal to j, and both i and j are natural numbers starting from 1 and less than or equal to N.

[0012] Optionally, in the demodulation reference signal port configuration information indicated by the elements of Bi and Bj, at least one of the following characteristics is different: scrambling sequence, port number, number of ports, whether transmitted simultaneously with the data transmission process, number of demodulation reference signal symbols, and time domain code.

[0013] Optionally, the subsets Ai, Aj of the first information set are different, wherein i is not equal to j, and both i, j are natural numbers starting from 1 and less than or equal to N.

[0014] Optionally, the elements indicating the second codeword in Ai, Aj are different.

[0015] Optionally, the elements contained in Ai and Aj have the same information content but different element indexes.

[0016] Optionally, the method also includes: obtaining a third information set C and a fourth information set D, and associating the third information set and the fourth information set; the elements in the third information set C are used to indicate one of the following information: modulation and demodulation mode, redundant version information; the elements in the fourth information set D are used to indicate demodulation reference signal port configuration information, and the demodulation reference signal ports indicated by the elements in the fourth information set belong to two codewords.

[0017] Optionally, the fourth information set D, compared with the subset of the second information set B, has at least different element indexes.

[0018] Optionally, a subset of the first information set A and the third information set C are the same.

[0019] Optionally, associating an Xth information set and a Yth information set, wherein X and Y are natural numbers, includes: when a first communication node of two communicating parties notifies a second communication node that information about the demodulation reference signal port belongs to the Yth information set, the first communication node notifies the second communication node that the modulation and demodulation mode and / or redundant version information must belong to an element in the Xth information set.

[0020] According to another embodiment of the present invention, a method for configuring DMRS port information is provided, characterized in that it includes: presetting one or more demodulation reference signal port groups; instructing the second communication node of the opposite end through signaling: whether the resources occupied by the preset demodulation reference signal port group are used to send data; wherein the communicating parties agree that the resources occupied by the non-preset demodulation reference signal port group cannot be used to send data, and no signaling is required to indicate whether data is sent on the non-preset demodulation reference signal port group resources; wherein the number of the non-preset port groups is at least 2, and the demodulation reference signal ports in the same port group occupy the same time-frequency resources.

[0021] Optionally, the power of all demodulation reference signal ports is limited to a constant value.

[0022] Optionally, different second communication nodes or cells preset different demodulation reference signal port groups.

[0023] Optionally, the non-preset demodulation reference signal port group is configured by configuring a zero-power reference signal.

[0024] According to another embodiment of the present invention, a method for configuring demodulation reference signal port information is also provided, including: sending a joint notification; wherein the joint notification includes at least one of the following information: demodulation reference signal port information and the starting position of data transmission; the maximum number of ports of the demodulation reference signal and the number of supplementary demodulation reference signal symbols.

[0025] Optionally, the set of demodulation reference signal port information is determined by a starting position of data configured by a high layer.

[0026] Optionally, the more the number of the supplemental demodulation reference signal symbols is, the smaller the maximum number of ports of the demodulation reference signal is.

[0027] According to another embodiment of the present invention, a method for configuring control signaling is provided, which determines at least one of the following parameters based on the number N of codewords in the transmission data: the number of code block groups corresponding to a codeword, the number of ACK / NACK feedback bits corresponding to a codeword, and the number of new transmission data indication bits corresponding to a codeword, wherein N is an integer.

[0028] Optionally, for one of the parameters, the sum of the parameters corresponding to all codewords is X, where X is predefined or configured by high-level signaling.

[0029] Optionally, for one of the parameters, at least one of the following rules is predefined: Rule 1: the more layers the codeword contains, the larger the parameter of the codeword; Rule 2: the larger the transmission block TB of the codeword, the larger the parameter of the codeword; Rule 3: the larger the modulation and demodulation mode of the codeword, the larger the parameter of the codeword; Rule 4: the larger the feedback channel quality indication CQI of the codeword, the larger the parameter of the codeword.

[0030] Optionally, for one of the parameters, a quotient of X and N is not an integer.

[0031] Optionally, for one of the parameters, when there are at least two codewords, for the codeword with a larger parameter, the parameter is equal to X divided by N and rounded up, and / or, for the codeword with a smaller parameter, the parameter is equal to X divided by N and rounded down.

[0032] Optionally, for a codeword, the parameter is equal to the number of layers included in the codeword multiplied by X and divided by the total number of layers of all codewords, and then rounded up.

[0033] According to another embodiment of the present invention, there is also provided a device for notifying reference signal information, which is applied to a first communication node, and the device includes: an acquisition module, used to acquire a first information set A and a second information set B, divide the first information set A and the second information set B into N subsets respectively, and associate the first information set subset Ai and the second information set subset Bi, wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode, redundant version information; wherein the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the subset Bi belongs to a codeword; and a first sending module, used to send the first information set A and the second information set B to the second communication node.

[0034] According to another embodiment of the present invention, there is provided a configuration device for demodulation reference signal port information, which is applied to a first communication node, and includes: a setting module, which is used to preset one or more demodulation reference signal port groups; a second sending module, which is used to indicate the following information to the second communication node through signaling: whether the resources occupied by the preset demodulation reference signal port group are used to send data; wherein the first communication node and the second communication node agree that the resources occupied by the non-preset demodulation reference signal port group cannot be used to send data, and no signaling is required to indicate whether data is sent on the non-preset demodulation reference signal port group resources; wherein the number of the non-preset port groups is at least 2, and the demodulation reference signal ports in the same port group occupy the same time-frequency resources.

[0035] According to another embodiment of the present invention, there is also provided a device for configuring demodulation reference signal port information, which is applied to a first communication node and includes: a third sending module, used to send a joint notification to a second communication node; wherein the joint notification includes at least one of the following information: demodulation reference signal port information and the starting position of data transmission; the maximum number of ports of the demodulation reference signal and the number of supplementary demodulation reference signal symbols.

[0036] According to another embodiment of the present invention, there is also provided a control signaling configuration device, which is applied to a first communication node, and a determination module is used to determine at least one of the following parameters based on the number N of code words in the transmission data: the number of code block groups corresponding to a code word, the number of ACK / NACK feedback bits corresponding to a code word, and the number of new transmission data indication bits corresponding to a code word, wherein N is an integer.

[0037] According to another embodiment of the present invention, a storage medium is further provided, wherein the storage medium includes a stored program, wherein the program executes the method described in any one of the above optional embodiments when running.

[0038] According to another embodiment of the present invention, a processor is provided, wherein the processor is used to run a program, wherein the program executes the method described in any one of the above optional embodiments when running.

[0039] Through the present invention, the first communication node obtains the first information set A and the second information set B, divides the first information set A and the second information set B into N subsets respectively, and associates the first information set subset Ai and the second information set subset Bi, wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode MCS, redundant version RV information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the subset Bi belongs to a codeword; the first communication node sends the first information set A and the second information set B to the second communication node. By adopting the above technical solution, the two information sets are associated and sent to the communication node at the opposite end, which solves the problem of high overhead of notifying DMRS port configuration information in the related technology and greatly reduces the overhead of DMRS port configuration information. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0041] Figure 1 It is a schematic diagram of DMRS in data transmission according to the related art;

[0042] Figure 2 It is a schematic diagram of a pre-demodulation reference signal and a supplementary demodulation reference signal according to the related art;

[0043] Figure 3 is a flow chart of a method for configuring reference signal information according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of DMRS type 2 in preferred embodiment 1 of the present invention. Figure 1 ;

[0045] Figure 5 This is a schematic diagram of DMRS type 2 in preferred embodiment 1 of the present invention. Figure 2 ;

[0046] Figure 6 is a schematic diagram of DMRS type 1 in preferred embodiment 1 of the present invention Figure 1 ;

[0047] Figure 7 is a schematic diagram of DMRS type 1 in preferred embodiment 1 of the present invention Figure 2 ;

[0048] Figure 8 This is a schematic diagram of DMRS symbol configuration of a base station according to a preferred embodiment 2 of the present invention;

[0049] Fig. 9 is a schematic diagram of a DMRS and a supplementary reference signal of type 2 according to a preferred embodiment 4 of the present invention;

[0050] Fig.10 It is a schematic diagram of limiting the maximum number of DMRS ports according to preferred embodiment 4 of the present invention. DETAILED DESCRIPTION

[0051] It should be noted that a mobile communication network (including but not limited to a 5G mobile communication network) is provided in the embodiments of the present application, and the network architecture of the network may include network-side devices (such as base stations) and terminals. In the present embodiment, an information transmission method that can be run on the above network architecture is provided. It should be noted that the operating environment of the above information transmission method provided in the embodiments of the present application is not limited to the above network architecture.

[0052] The first communication node in the present application document may be a base station side device, and the second communication node may be a terminal side device. Of course, it is not excluded that both the first communication node and the second communication node are terminal devices, and the two perform D2D communication.

[0053] Embodiment 1

[0054] In this embodiment, a configuration of reference signal information running on the above network architecture is provided. Figure 3 is a flow chart of a method for configuring reference signal information according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0055] Step S302, obtaining a first information set A and a second information set B, dividing the first information set A and the second information set B into N subsets respectively, and associating the first information set subset Ai and the second information set subset Bi, wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N;

[0056] Step S304, wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode, redundant version information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the set B belongs to a codeword.

[0057] Through the above steps and the above technical solution, the first information set and the second information set are obtained, and the two information sets are associated and sent to the communication node of the other end, which solves the problem of high overhead of notifying DMRS port configuration information in related technologies and greatly reduces the overhead of DMRS port configuration information.

[0058] Optionally, the execution entity of the above steps may be a base station, a terminal, etc., but is not limited thereto.

[0059] Optionally, the subsets Bi and Bj of the second information set are different, wherein i is not equal to j, and both i and j are natural numbers starting from 1 and less than or equal to N.

[0060] Optionally, in the demodulation reference signal port configuration information indicated by the elements of Bi and Bj, at least one of the following characteristics is different: scrambling sequence, port number, number of ports, whether transmitted simultaneously with the data transmission process, number of demodulation reference signal DMRS symbols, and time domain code.

[0061] Optionally, the subsets Ai and Aj of the first information set are different, wherein i is not equal to j, and both i and j are natural numbers starting from 1 and less than or equal to N.

[0062] Optionally, the elements indicating the second codeword in Ai, Aj are different.

[0063] Optionally, the elements contained in Ai and Aj have the same information content but different element indexes.

[0064] Optionally, before the first communication node sends the first information set A and the second information set B to the second communication node, the first communication node obtains a third information set C and a fourth information set D, and associates the third information set and the fourth information set; the elements in the third information set C are used to indicate one of the following information: MCS, RV information; the elements in the fourth information set D are used to indicate demodulation reference signal port configuration information, and the demodulation reference signal ports indicated by the elements in the fourth information set belong to two codewords.

[0065] Optionally, the fourth information set D, compared with the subset of the second information set B, has different element indices.

[0066] Optionally, a subset of the first information set A and the third information set C are the same.

[0067] Optionally, associating the Xth information set and the Yth information set, wherein X and Y are natural numbers, comprises: when the first communication node notifies the second communication node that the elements of the Xth information set belong to the Yth information set, the first communication node notifies the second communication node that the elements in the Yth information set must belong to the Xth information set. It should be supplemented that what is recorded in this embodiment is the meaning of associating two sets in the present application document, and the above-mentioned associating method is also applicable to associating two subsets.

[0068] According to another embodiment of the present invention, a method for configuring DMR port information is also provided, the method comprising the following steps:

[0069] Step 1: The first communication node presets one or more demodulation reference signal port groups;

[0070] Step 2, the first communication node instructs the second communication node through signaling of the following information: whether the resources occupied by the preset demodulation reference signal port group are used to send data; wherein, the first communication node and the second communication node agree that the resources occupied by the non-preset demodulation reference signal port group cannot be used to send data, and no signaling is required to indicate whether data is sent on the non-preset demodulation reference signal port group resources; wherein, the number of the non-preset port groups is at least 2, and the demodulation reference signal ports in the same port group occupy the same time-frequency resources.

[0071] By adopting the above technical solution, the overhead of DMRS port configuration information notification is saved and the accuracy of DMRS channel is improved.

[0072] Optionally, the first communication node limits the power of all demodulation reference signal ports to a constant value.

[0073] Optionally, different second communication nodes or cells preset different demodulation reference signal port groups.

[0074] Optionally, the first communication node configures the non-preset demodulation reference signal port group by configuring a zero-power reference signal.

[0075] According to another embodiment of the present invention, a method for configuring DMR port information is also provided, which includes the following steps:

[0076] The first communication node sends a joint notification to the second communication node; wherein the joint notification includes at least one of the following information: DMRS port information and a starting position of data transmission; a maximum number of DMRS ports and a number of supplementary DMRS symbols.

[0077] Optionally, the set of DMRS port information is determined by the starting position of data configured by a higher layer.

[0078] Optionally, the more the number of supplementary DMRS symbols is, the smaller the maximum number of ports of the DMRS is.

[0079] According to another embodiment of the present invention, a method for configuring control signaling is provided, which can be applied to a first communication node, and the method includes the following steps:

[0080] At least one of the following parameters is determined according to the number N of code words in the transmission data: the number of code block groups corresponding to one code word, the number of ACK / NACK feedback bits corresponding to one code word, and the number of new transmission data indication bits corresponding to one code word, wherein N is an integer.

[0081] The above technical solution solves the problem of increased control signaling overhead caused by dynamic changes in code words in the related art. Even when the code words change dynamically, the control signaling overhead remains unchanged, thereby reducing the complexity of user detection.

[0082] Optionally, for one parameter, the sum of the parameters corresponding to all codewords is X, where X is predefined or configured by high-level signaling.

[0083] Optionally, for one of the parameters, at least one of the following rules is predefined: Rule 1: the more layers the codeword contains, the larger the parameter of the codeword; Rule 2: the larger the transmission block TB of the codeword, the larger the parameter of the codeword; Rule 3: the larger the modulation and demodulation mode MCS of the codeword, the larger the parameter of the codeword; Rule 4: the larger the feedback channel quality indication CQI of the codeword, the larger the parameter of the codeword.

[0084] Optionally, for one of the parameters, a quotient of the X and the N is not an integer.

[0085] Optionally, for one of the parameters, for a codeword where the parameter is greater than a first preset value, the parameter is equal to X divided by N and rounded up, and / or, for a codeword where the parameter is less than a second preset value, the parameter is equal to X divided by N and rounded down.

[0086] Optionally, for a codeword, the parameter is equal to the number of layers included in the codeword multiplied by X and divided by the total number of layers of all codewords, and then rounded up.

[0087] According to another embodiment of the present invention, a method for notifying reference signal information is further provided. The method is applied to a second communication node, and the method includes the following steps:

[0088] The second communication node receives a first information set A and a second information set B sent by the first communication node, wherein the first communication node divides the first information set A and the second information set B into N subsets respectively, and associates the first information set subset Ai and the second information set subset Bi, wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode MCS, RV information; and the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the subset Bi belongs to a codeword.

[0089] Optionally, the method also includes: the second communication node receives a third information set C and a fourth information set D sent by the first communication node, wherein the first communication node associates the third information set and the fourth information set.

[0090] Optionally, the elements in the third information set are used to indicate one of the following information: MCS, RV information; the elements in the fourth information set are used to indicate demodulation reference signal port configuration information, and the demodulation reference signal ports indicated by the elements in the fourth information set belong to two codewords.

[0091] Optionally, the Xth information set and the Yth information set are associated: when the first communication node notifies the second communication node that the elements of the Xth information set belong to the Yth information set, the first communication node notifies the second communication node that the elements in the Yth information set must belong to the Xth information set; wherein X and Y are natural numbers.

[0092] According to another embodiment of the present invention, a method for configuring DMR port information is provided, which can be applied to a second communication node, and the method includes the following steps:

[0093] The second communication node receives the following information sent by the first communication node: whether the resources occupied by the demodulation reference signal port group preset by the first communication node are used to send data; wherein, the first communication node and the second communication node agree that the resources occupied by the non-preset demodulation reference signal port group cannot be used to send data, and no signaling is required to indicate whether data is sent on the non-preset demodulation reference signal port group resources; wherein, the number of the non-preset port groups is at least 2, and the demodulation reference signal ports in the same port group occupy the same time-frequency resources.

[0094] According to another embodiment of the present invention, a method for configuring DMR port information is provided, the method comprising the following steps:

[0095] The second communication node receives a joint notification sent by the first communication node; wherein the joint notification includes at least one of the following information: DMRS port information and a starting position of data transmission; a maximum number of DMRS ports and a number of supplementary DMRS symbols.

[0096] The following is a detailed description with reference to the preferred embodiments of the present invention.

[0097] Preferred embodiment 1: DMRS type 2 solution

[0098] Currently, for the design of reference signals, a DMRS pattern based on FD-OCC (Frequency domain orthogonal covering code), which we call DMRS type 2, can effectively support a maximum of 6 ports (such as Figure 4 ), supports a maximum of 12 ports when 2 DMRS symbols are used (as shown in Figure 5 shown).

[0099] Figure 4 This is a schematic diagram of DMRS type 2 in preferred embodiment 1 of the present invention. Figure 1 ,like Figure 4 As shown, in one RB (Resource block), the horizontal axis is the time domain and the vertical axis is the frequency domain. The six DMRS ports are divided into three DMRS port groups, and port group #0 includes ports p0 and p1. In port group #0, ports p0 and p1 are mapped to the same time-frequency resources by OCC code division. For example, the OCC code used by port p0 is [1 1], and the OCC code used by port p1 is [1-1]. In one RB, the subcarriers mapped by ports p0 and p1 include subcarriers #4, #5; #10, #11. Similarly, port group #1 includes ports p2 and p3. In port group #1, ports p2 and p3 are mapped to the same time-frequency resources by OCC code division. For example, the OCC code used by port p1 is [1 1], and the OCC code used by port p3 is [1-1]. Port group #2 includes ports p4 and p5. In port group #2, ports p4 and p5 are mapped to the same time-frequency resources by OCC code division. For example, the OCC code used by port p4 is [1 1], and the OCC code used by port p5 is [1-1]. These six DMRS ports can be allocated to one user, i.e., SU-MIMO (single-user MIMO), or to multiple users, i.e., MU-MIMO (multi-user MIMO). Figure 4 The pattern in the figure can support a maximum of 6 DMRS ports, but the actual base station does not necessarily have to allocate 6 DMRS ports to users when scheduling users. For example, when there are fewer users in the cell and the total number of ports required by the users is relatively small, the base station only needs to send one or two ports.

[0100] In order to achieve the most flexible scheduling, when the number of DMRS ports required is relatively small, the base station only needs to allocate a small number of ports to the user, and the resources occupied by the remaining ports can be used to send data to the user. When the number of DMRS ports required is relatively large, the base station must allocate multiple ports to the user. At this time, the resources occupied by the DMRS ports are very few or cannot be used to transmit data to the user. For example, when the base station schedules a DMRS port number of 1 for user #0, and the allocated port is p#0, if there is no other user to perform multi-user transmission with this user, the base station can send data to the user on the REs occupied by p#2, p#3, p#4, and p#5. At this time, the base station needs DCI signaling to indicate whether the user has data to send or receive on port group #1 (including p#2, p#3) and port group #2 (including p#4, p#5). If the base station allocates DMRS ports p2, p#3, p#4, and p#5 to UE#1, all DMRS ports cannot be used for data transmission.

[0101] However, this flexible port indication notification brings huge physical layer dynamic signaling overhead. After allocating port p#0 to user #0, the base station also needs to indicate to the user whether the resources occupied by port group #1 are used for data transmission or sending, and also needs to indicate to the user whether the resources occupied by port group #2 are used for data transmission or sending. This is because SU-MIMO and MU-MIMO are dynamically switched, and it is possible that other users only occupy the resources of port group #1, or it is possible that other users occupy the resources of port groups #1 and #2 at the same time.

[0102] In addition, when other users do not occupy the resources of port groups #1 and #2, if the resources occupied by port groups #1 and #2 are all allocated to user #0 to transmit data, then the power on ports p2, p3, p4, and p5 cannot be borrowed to ports p#0 and p#1, and the DMRS of UE #0 has no power boosting. Since the density of each DMRS port in the DMRS pattern of this FD-OCC is very low, power boosting is particularly important, and not doing power boosting has a great impact on channel estimation.

[0103] A method for solving the problem of high signaling overhead and power enhancement includes the following steps:

[0104] (1) One or more demodulation reference signal port groups are preset, and the first communication node needs to signal the second communication node whether the resources occupied by these port groups are used to send data, while the resources occupied by other non-preset port groups cannot be used to send data, and no signal is required to indicate whether data is sent on these non-preset port group resources. Among them, the number of non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time-frequency resources.

[0105] For UE#0, it can be preset that the demodulation reference signal port group #2 may be used to send data. Then, for other non-preset demodulation reference signal port groups #0 and #1, even if there are no other users doing multi-user MIMO with UE#0, the base station will not schedule UE#0 to send or receive data on the resources where port groups #0 and #1 are located, and of course no signaling indication is required. In this way, if the DMRS port assigned to UE#0 is on port group #0, for example, p0, this ensures that the power of port group #1 can be lent to port group #0, that is, 3dB power boosting, and the characteristics of channel estimation are guaranteed. At the same time, the base station does not need DCI dynamic signaling to notify UE#0 whether there is data transmission on port group #1. Since it is preset that data may be sent on DMRS port group #2, the base station also needs dynamic signaling to indicate whether UE#0 has data transmission on DMRS port group #2.

[0106] If UE#0 is assigned ports p#0 and p#1, and there is no data transmission of UE#0 on port group #2 (port group #2 may be occupied by other users at this time), then for UE#0, the power of port groups #1 and #2 can be lent to port group #0, so that the power of port group #0 is 3 times the original, that is, 4.77dB. Although the power can be tripled at this time, the interference of the power of port group #0 to the neighboring cells is also increased, and the power of DMRS will change, that is, sometimes 3dB, sometimes 4.77dB. It will also affect the demodulation complexity. (2) Therefore, a further method is to preset one or more demodulation reference signal port groups, and the first communication node needs to signal the second communication node whether the resources occupied by these port groups are used to send data, while the resources occupied by other non-preset port groups cannot be used to send data, and no signaling is required to indicate whether data is sent on these non-preset port group resources. Among them, the number of non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time-frequency resources. Furthermore, the power of the demodulation reference signal port is limited to a constant value N. Specifically, for demodulation reference signal type 2, a demodulation reference signal group is preset, and the power of the DMRS port is limited to 3dB. The DMRS power described in this article also refers to the power ratio between the DMRS port and the data layer. If there is no power enhancement, the power between the DMRS port and the corresponding data layer is 1:1, that is, 0dB.

[0107] (3) Based on the methods of (1) and (2), a further method is characterized in that different users or cells have different preset demodulation reference signal port groups. For example, for UE#0 in cell#0, the preset DMRS port group is #1, and for UE#1 in cell#1, the preset DMRS port group is #2. The advantage of this is that interference randomization can be achieved.

[0108] (4) A further method, presetting one or more demodulation reference signal port groups refers to predefining or configuring the DMRS port group through signaling. Predefined means that no signaling notification is required, it is specified in the standard, and it is information that the base station and the user know by default. Configuration through signaling means that the base station configures the DMRS port group through high-level signaling and / or dynamic signaling. For example, the preset DMRS port group configured to the user by the base station through high-level signaling or DCI dynamic signaling is port group #1. Optionally, the base station can configure multiple preset DMRS port group configurations through high-level signaling, for example, the base station configures 2 preset DMRS port group configurations through high-level signaling, port group configuration #0 includes port group #1, and port group configuration #1 includes port group #2, and then the base station selects one from the two port group configurations using dynamic DCI signaling to notify the user. The high-level signaling can be RRC signaling or MAC signaling or RRC signaling combined with MAC signaling.

[0109] (5) Optionally, the base station configures a zero-power reference signal to configure a non-preset demodulation reference signal port group, then all port groups except the non-preset port groups are preset port groups. The bandwidth of the zero-power reference signal is the same as the resource length allocated to the user. For example, the resources occupied by the zero-power reference signal are the same as those occupied by port groups #0 and #1, then the remaining port group #2 is the preset port group.

[0110] Figure 5 This is a schematic diagram of DMRS type 2 in preferred embodiment 1 of the present invention. Figure 2 ,like Figure 5As shown in the figure, when there are 2 DMRS symbols, a maximum of 12 DMRS ports can be supported. The 12 DMRS ports are divided into 3 DMRS port groups, port group #0 includes ports p0, p1, p6, p7; port group #1 includes ports p2, p3, p8, p9; port group #2 includes ports p4, p5, p10, p11. In port group #0, ports p0, p1, p6, p7 occupy the same time-frequency resources, but use different time-domain or frequency-domain OCC codes. For example, p0 and p1 are distinguished by the OCC code in the frequency domain, while the time domain OCC code is the same, that is, the frequency domain OCC code used by p0 is [1 1], and the frequency domain OCC code used by port p1 is [1-1], while p0 and p1 both use the OCC code [1 1] in the time domain; p6 and p7 are also distinguished by the OCC code in the frequency domain, while the time domain OCC code is the same, that is, the frequency domain OCC code used by p6 is [1 1], and the frequency domain OCC code used by port p7 is [1-1], while p6 and p7 both use the OCC code [1-1] in the time domain. Similarly, the same is true for the other four ports in the port group. In port group #1, p2 and p3 use different frequency domain OCC codes, but use the same time domain OCC code, p8 and p9 use different frequency domain OCC codes, and also use the same time domain OCC code, but the time domain OCC code used by p2 and p3 is different from that of p8 and p9. In port group #2, p4 and p5 use different frequency domain OCC codes but the same time domain OCC code, p10 and p11 use different frequency domain OCC codes but the same time domain OCC code, but the time domain OCC code used by p4 and p5 is different from that of p10 and p11.

[0111] Based on a pre-reference signal of 2 symbols, a method for solving the problem of high signaling overhead and power enhancement is characterized in that one or more demodulation reference signal port groups are preset, and the first communication node needs to signal to indicate whether the resources occupied by these port groups of the second communication node are used to send data, while the resources occupied by other non-preset port groups cannot be used to send data, and no signal is required to indicate whether data is sent on these non-preset port group resources. Among them, the number of non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time-frequency resources. Specifically, for type 2 DMRS, since the number of port groups is 3, the specific method is to preset 1 demodulation reference signal port group, the first communication node needs to signal to indicate whether the resources occupied by these port groups of the second communication node are used to send data, while the resources occupied by other non-preset port groups cannot be used to send data, and no signal is required to indicate whether data is sent on these non-preset port group resources. A further method is to limit the power of the DMRS port to 3dB.

[0112] A further method is characterized in that different users or cells have different preset demodulation reference signal port groups.

[0113] In a further method, presetting one or more demodulation reference signal port groups refers to predefining or configuring the DMRS port group through signaling. Predefined means that no signaling notification is required, it is specified in the standard, and it is information that the base station and the user know by default. Configuration through signaling means that the base station configures the DMRS port group through high-level signaling and / or dynamic signaling. For example, the preset DMRS port group configured to the user by the base station through high-level signaling or DCI dynamic signaling is port group #2. Optionally, the base station can configure multiple preset DMRS port group configurations through high-level signaling, for example, the base station configures 2 preset DMRS port group configurations through high-level signaling, port group configuration #0 includes port group #1, port group configuration #1 includes port group #2, and then the base station selects one from the two port group configurations using dynamic DCI signaling to notify the user.

[0114] In a further method, the base station configures a zero-power reference signal to implement a non-preset demodulation reference signal port group, wherein the bandwidth of the zero-power reference signal is the same as the length of the resource allocated to the user.

[0115] The ports p0-p11 described in this article are all integers, and are not necessarily consecutive integers. For example, p0-p11 may actually represent ports 1000-1011, or may be 1000, 1003, 1001, 1004, 1002, 1005, 1006, 1009, 1007, 1010, 1008, 1011 in sequence.

[0116] The following are subsidiary embodiments of the preferred embodiment 1:

[0117] Preferred embodiment 1a: DMRS type 1 solution

[0118] A DMRS pattern based on IFDM (Interleaved Frequency domain multiplexing), which we call DMRS type 1, can effectively support a maximum of 4 ports (such as Figure 6 ), supports a maximum of 8 ports when 2 DMRS symbols are used (as shown in Figure 7 shown).

[0119] Figure 6 is a schematic diagram of DMRS type 1 in preferred embodiment 1 of the present invention Figure 1 ,exist Figure 6In the embodiment, the DMRS ports are divided into two port groups, port group #0 includes p0 and p2, and p0 and p2 occupy the same time-frequency resources and are distinguished by different codes, such as different CS (cyclic shift) sequences. Port group #1 includes p1 and p3, and p1 and p3 occupy the same time-frequency resources and are distinguished by different codes.

[0120] Figure 7 is a schematic diagram of DMRS type 1 in preferred embodiment 1 of the present invention Figure 2 ,exist Figure 7 In the example, 8 ports are divided into 2 port groups. Port group #0 includes p0, p2, p4, and p6, and p0, p2, p4, and p6 occupy the same time-frequency resources. p0 and p2 use different codes in the frequency domain, for example, p0 uses CS sequence 0 and p2 uses CS sequence 1; p4 and p6 also use different codes in the frequency domain. However, p0 and p2 use the same OCC code in the time domain, and p4 and p6 also use the same OCC code in the time domain, which is different from the OCC code used by p0 and p2 in the time domain. Similarly, port group #1 includes ports p1, p3, p5, and p7, and p1 and p3 use different CS codes in the frequency domain and the same OCC code in the time domain; p5 and p7 use different CS codes in the frequency domain and the same OCC code in the time domain, which is different from the code used by p1 and p3 in the time domain.

[0121] In summary, all ports in a port group are mapped to the same time-frequency resources and are distinguished from each other by different time-domain or frequency-domain codes.

[0122] For DMRS type 1, the same method as above is used.

[0123] Preferred embodiment 2:

[0124] like Figure 5 , Figure 7 As shown in the figure, when there are 2 DMRS symbols, the DMRS ports in a port group occupy the same time-frequency resources, and each DMRS port occupies 2 time domain symbols. If the base station indicates that a DMRS port group cannot be used for data transmission, then the REs (resource elements) on the 2 time domain symbols occupied by the DMRS port group cannot be used for data transmission. Figure 5 As described above, the ports assigned to UE#0 by the base station are p0, p1, p6, and p7, that is, UE#0 is scheduled for 4-layer transmission. At this time, the base station assigns port p4 to UE#1, and UE#0 and UE#1 perform multi-user transmission. At this time, UE#0 cannot transmit data on the resources occupied by the DMRS port group where UE#1 is located. That is, the time-frequency resources where p4 is located cannot be used for data transmission, and the time-frequency resources occupied by p4 occupy 2 time domain symbols.

[0125] Although this design is simple, the resource utilization is not high. This is because the DMRS configured for different users can be different when the base station configures 1 DMRS symbol or 2 DMRS symbols. In this case, Figure 8 Schematic diagram of DMRS symbol configuration of a base station according to a preferred embodiment 2 of the present invention, such as Figure 8 As shown in the figure, the base station configures two DMRS symbols for UE#0, and the ports assigned to UE#0 are p0, p1, p6, and p7, that is, UE#0 is scheduled for 4-layer transmission. At this time, the base station configures one DMRS symbol for UE#1, and allocates ports p4 and p5. At the same time, the base station configures two DMRS symbols for UE#2, and the allocated ports are p2, p3, p8, and p9. UE#0, UE#1, and UE#2 perform multi-user transmission.

[0126] In this way, for UE#1, DMRS is only sent on the first DMRS symbol. The spare resources on the second DMRS symbol on the corresponding subcarrier can also be used to transmit data. That is, on time domain symbol #3, subcarrier resources #0, #1, #6, and #7 can be used to send data. This is because if the channel condition of UE#1 is good, it is not necessary to send DMRS on the second DMRS symbol. At this time, the base station needs to use signaling to indicate the location on the DMRS symbol that the user can use for data transmission.

[0127] For users configured with 2 DMRS symbols, the base station needs to indicate whether a subset of resources occupied by certain DMRS port groups is used for data transmission. The resources occupied by the DMRS port group are divided into 2 subsets, with subset #0 and subset #1 occupying the resources occupied by the first DMRS symbol and the second DMRS symbol of the DMRS port group, respectively. For example, the resources occupied by port group #2 include (2,0)(3,0)(2,1)(3,1), (2,6)(3,6)(2,7)(3,7), where (x,y) represents the time domain symbol number and subcarrier number in the PRB. Subset #0 of the resources occupied by port group #2 includes resources (2,0)(2,1)(2,6)(2,7); and subset #1 of the resources occupied by port group #2 includes resources (3,0)(3,1)(3,6)(3,7). At this time, for UE #0, the base station needs to use signaling to notify whether resource subsets #0 and subsets #1 in port group #2 can be used for data transmission.

[0128] Meanwhile, for a user configured with one DMRS symbol, the base station needs to indicate whether resource groups on other DMRS symbols other than the DMRS symbol allocated to the user can transmit data.

[0129] Table 1 is a table indicating a subset of demodulation reference signals for sending data to a user according to preferred embodiment 2. As shown in Table 1, the base station can use different indications to indicate whether each subset on demodulation reference signal group #2 is used to send data to a user.

[0130] Table 1

[0131]

[0132] In combination with the method in Example 1, that is, one or more demodulation reference signal port groups are preset, the first communication node needs to signal the second communication node whether the resources occupied by these port groups are used to send data, while the resources occupied by other non-preset port groups cannot be used to send data, and no signaling is required to indicate whether data is sent on these non-preset port group resources. Among them, the number of non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time-frequency resources. Furthermore, it indicates whether a subset of the preset port group resources is used to send data.

[0133] It is worth noting that if the demodulation reference signal resources are used to transmit the demodulation reference signal of the current user, then these resources cannot transmit data, even if the demodulation reference signal port groups corresponding to these resources are preset.

[0134] Preferred embodiment 3:

[0135] Depend on Figure 4-Figure 7 As can be seen from the figure, in order to achieve sufficient flexibility, the standard needs to support demodulation reference signal type 1 and demodulation reference signal type 2, and each demodulation reference signal type needs to support the case of 1 DMRS and the case of 2 DMRS. In addition, if data and DMRS can be sent on the same symbol, the base station also needs to indicate to the user whether the resources on certain DMRS port groups are used to send or receive data. This will result in a particularly large signaling overhead in the DCI.

[0136] In LTE, for the initial transmission of data, when the number of DMRS ports or the number of layers is 2 or more, 2 code words CW (code word, referred to as CW) are required, that is, 2 transmission blocks (TB) are used to transmit data, as shown in Table 5.3.3.1.5C-1 or 5.3.3.1.5C-2 in the notification 36.212 of the DMRS port information. Moreover, for each transmission block, the base station configures 1 MCS / RV / NDI (modulation and coding mode / redundancy version / new data indicator) indication field (5+1+2=8 bits) for each CW in the DCI, as shown below, MCS requires 5 bits, NDI requires 1 bit, and RV requires 2 bits.

[0137] In addition,for transport block 1:

[0138] -Modulation and coding scheme–5bits as defined in section 7.1.7of[3]

[0139] -New data indicator–1 bit

[0140] -Redundancy version–2 bits

[0141] In addition,for transport block 2:

[0142] -Modulation and coding scheme–5bits as defined in section 7.1.7of[3]

[0143] -New data indicator–1 bit

[0144] -Redundancy version–2 bits

[0145] If only one CW is actually transmitted, that is, the second CW is not transmitted (disabled), then in the second MCS / RV / NDI indication field, I MCS =0, and the value of the redundancy version indicator is 1, as shown below in 36.213.

[0146] -In DCI formats 2,2A,2B,2C and 2D a transport block is disabled ifI MCS =0and if rv idx =1otherwise the transport block is enabled.

[0147] In NR, the base station will semi-statically configure the maximum number of CWs for the user through high-level signaling based on the user's situation. If a user can only support up to 4 layers of data transmission, then 1 CW is configured, because in NR, for the initial transmission of data, 2 CWs are required only when the number of DMRS ports or the number of layers is 4 or more. If the user has a demand and can support 5 DMRS ports or more, the base station will semi-statically configure the maximum number of CWs for the user to be 2. It is worth noting that even if the base station configures the number of CWs configured for the user to be 2 through high-level signaling, one CW can be sent during actual transmission, depending on whether the total number of ports required exceeds 4. However, as long as the base station configures the number of CWs configured for the user to be 2 through high-level signaling, MCS / RV / NDI must be able to support the MCS, RV, and NDI information indication for 2 TBs.

[0148] If, like LTE, each CW requires an MCS / RV / NDI indication field of M bits, then different users will require different MCS / RV / NDI indication field overheads due to different maximum numbers of CWs. If a user is semi-statically configured with 1 CW, the MCS / RV / NDI indication field requires M bits; and if a user is semi-statically configured with 2 CWs, the MCS / RV / NDI indication field requires 2M bits. In this way, when two CWs are configured, the two CWs are equivalent to independent coding, that is, each CW requires an independent MCS / RV / NDI domain. At this time, if the number of layers transmitted to the user is less than or equal to N, N=4, only one CW is needed, that is, CW#0. At this time, CW#1 is deactivated. Like LTE, a special indication bit in the MCS / RV domain corresponding to CW#1 can be used to indicate the deactivation of CW#1. As shown in Table 3, when the MCS / RV indication bit (Indicator) indicated by the base station in the MCS / RV domain corresponding to CW#1 is 1, that is, MCS=0, RV=1, it indicates that CW#1 is deactivated.

[0149] Table 2 is a configuration table 1 according to preferred embodiment 3. As shown in Table 2, 2 CWs are configured, and the MCS / RV fields of the 2 CWs are independently encoded.

[0150] Table 2

[0151]

[0152] If, like LTE, the port information of DMRS is notified for different CWs, as described in Table 2. To simplify the analysis, Table 2 assumes that there is only one DMRS symbol and data will not be transmitted on the DMRS symbol.

[0153] Table 3 is a DMRS information notification table according to preferred embodiment 3. As shown in Table 3, the high layer configures 2 CWs.

[0154] Table 3

[0155]

[0156] As shown in Table 3 above, the high-level layer configures 2 CWs. When only 1 CW is actually activated, 0-23, a total of 24 status indication values ​​are required to notify the DMRS port information, because when the number of ports is relatively small, multi-user scheduling needs to be considered, and different scrambling IDs and port numbers need to be notified. When 3 CWs are actually activated, the number of DMRS ports is at least 5. Generally, multi-user scheduling does not need to be considered. Only 0-2, a total of 3 status indications are required to notify the DMRS port information. This method of configuring DMRS port information must be based on the maximum status indication value requirement when 1 CW is activated and 2 CWs are activated, that is, 24. In this way, 5 bits need to be arranged in DCI to notify the DMRS port information. The overhead in DCI has increased compared to LTE. Moreover, if this table considers dynamically notifying different numbers of DMRS symbols, whether data is transmitted on DMRS resources, etc., the DCI overhead will be even greater.

[0157] Associating the first information set subset Ai and the second information set subset Bi means that when the first communication node notifies the second communication node that the information about the DMRS port belongs to an element in Bi, the first communication node notifies the second communication node that the information about MCS / RV must belong to an element in Ai. Since the demodulation reference signal port indicated by the elements of Bi belongs to one codeword, the MCS / RV and other information corresponding to the second codeword in Ai is actually useless, that is, only one codeword is activated. It is worth noting that the first information set may be used only to indicate the status of MCS / RV, or it may be used to indicate the status of the combination of MCS, RV and other information, such as MCS, RV, and NDI.

[0158] Similarly, associating the third information set subset C and the fourth information set D means that when the first communication node notifies the second communication node that the information about the DMRS port belongs to the elements in D, the information about MCS / RV notified by the first communication node to the second communication node must belong to the elements in C.

[0159] Therefore, the first information or the third information refers to the information about MCS / RV, and the second or the fourth information refers to the information about the DMRS port.

[0160] The first information set and the third information set are used to indicate information such as MCS, RV, etc., for example, to indicate one or more of MCS, RV, and NDI. The first information set is used to indicate the situation when only one codeword (CW) is activated, and the third information set is used to indicate the situation when both codewords are activated. The second information set and the fourth information set are used to indicate the demodulation reference signal (DMRS) port information. The second information set is used to indicate the situation when only one codeword (CW) is activated, and the fourth information set is used to indicate the situation when both codewords are activated. The elements in each set can be regarded as a row of elements in the information table, but must be limited to the situation where different codewords are activated. So one activation can be regarded as a table.

[0161] Therefore, different subsets of A contain different MCS / RV and other information. As shown in Table 4, subset A1 is similar to LTE. In A1, the MCS / RV state of CW#1 must be a special state, indicating that CW#1 is not activated, and A1 is associated with B1, as shown in Table 5. B1 is only a part of the DMRS port information set. Each element in the table consists of an index (indicator) and the indicated content (for the first information set, it is MCS / RV, for the second information set, it is DMRS port, number of layers, etc.), that is, each element corresponds to a row in the table where an index is located. In other words, after associating subsets A1 and B1, if the MCS / RV state information indicator bit assigned to a user is an element in A1, then the DMRS port information state indicator bit is an element in B1, and the user can know that CW#0 is activated and CW#1 is deactivated, and can know the MCS / RV information of CW#0 and the DMRS port information assigned to CW#0 in B1. Similar to LTE, in subset A1, the MCS / RV state of CW#1 can only be a special state bit, indicating that CW#1 is deactivated, and the MCS / RV state of CW#0 includes all possible MCS / RV states, without any special processing. As shown in Table 5, compared with Table 3, when the state in B1 only protects one CW, part of the DMRS port information state indication bit (i.e., state indication bits 0-15 in Table 3) is not included in full.

[0162] At the same time, another subset of A, A2, is associated with B2, and A2 is different from A1.

[0163] If MCS / RV and other information are indicated independently for two CWs like in LTE, the MCS / RV status of CW#1 in A2 must be different from that in A1. In this case, the MCS / RV and other information about the first codeword in A2 and A1 are the same and there is no difference. The difference between A2 and A1 is that the elements indicating the second codeword in A1 and A2 are different.

[0164] A2 can be as shown in Table 6a, the MCS / RV state of CW#1 is another special state, indicating that CW#1 is not activated, and this special state is different from the state of CW#1 in A1, indicating that A2 is associated with B2, as shown in Table 7. After associating subsets A2 and B2, if the MCS / RV state information indicator bit assigned by a user is an element in A2, then the DMRS port information state indicator bit is an element in B2, and the user can know that CW#0 is activated and CW#1 is deactivated, and know the MCS / RV information of CW#0 and the DMRS port information assigned to CW#0 in B2. In subset A2, the MCS / RV state of CW#1 is a special state bit, indicating that CW#1 is deactivated, and the MCS / RV state of CW#0 includes all possible MCS / RV states, and there is no special processing. As shown in Table 7, compared with Table 3, the state in B2 includes a part of the DMRS port information state indication bits (i.e., state indication bits 16-23 in Table 3) when 1 CW is present, but not all. Assuming that B is divided into only 2 subsets, the elements in B1 and B2 contain all DMRS port indication information, that is, the information content in Table 3 is divided into 2 subsets, and the index of B2 is renumbered, so that B1 and B2 only need 4 bits to indicate, because the indexes of B1 and B2 are all within 16. Therefore, the elements used to indicate the second codeword information in A1 and A2 are different.

[0165] Optionally, A2 can be as shown in 6b, that is, in A2, the MCS / RV indication bit indicating CW#1 is all indication bits except the MCS / RV indication bit of CW#1 in A1. As shown in Table 8b, it can be any indication except the different MCS / RV information status of CW#1 in Table A1, that is, A2 is the same as the third information set C. For the port information of DMRS, the state bit index contained in B2 must be different from the state bit index in D, that is, the index value of the DMRS port information contained in B2 cannot be contained in D, that is, it cannot be 0, 1, 2. At this time, B2 is shown in Table 8, and the useful indication bits include 8-15. Further, the DMRS port information contained in B2 is different from the DMRS port information indicated by each state bit in B1. In fact, the DMRS port information indicated by value 8-15 in B2 is the DMRS port information indicated by indication bits 16-23 in Table 3. So when A2 is the same as C, the index of the element in B2 must be different from the index in D. At this time, since A2 and C are the same, when the user receives the indication bit of information such as MCS / RV, in order to distinguish whether it is A2 or C, that is, to distinguish whether 1 codeword is activated or 2 codewords are activated, the user first needs to judge according to the indication bit of the DMRS port information indicated by the base station, that is, to judge whether the indication information index about DMRS belongs to B2 or D. If it belongs to B2, then the corresponding MCS / RV information indicates that only 1 CW is activated. At this time, the element indexes of some subsets of D and B are different, that is, the indexes of D and B2 must be different. At the same time, some subsets of A are the same as C, that is, A2 and C are the same.

[0166] Where C and D respectively indicate the MCS / RV information and DMRS port information when two codewords are activated. For C, if it is like LTE, that is, the MCS / RV information indicating CW#1 cannot indicate that CW#1 is not activated, that is, all other indication bits except this special indication bit, then C may be equal to A2, and C is also shown in Table 6B. However, D is completely different from the subset of A, because D indicates the port information of two CWs, and for the initial transmission of data, the number of ports is generally greater than 4. Since the subset of A indicates the activation of one CW, for the initial transmission of data, the number of DMRS ports cannot exceed 4.

[0167] In this example, only two subsets of A are listed. In practice, A can be divided into multiple subsets. Different subsets of A correspond to different subsets of B. Finally, in the standard, multiple subsets of A may be written into one table, and different indexes may belong to different subsets. For example, as shown in Table 2, if the status bit of CW#1 indicated by the base station is 1, the information bit indicating MCS / RV belongs to A1 at this time, and if the status bit of CW#1 indicated by the base station is 0, the information bit indicating MCS / RV belongs to A2 at this time. At this time, it is assumed that A2 is as shown in Table 6a. Similarly, multiple subsets of B may be written into one table, as shown in Table 3, where the DMRS port information of 1 codeword and 2 codewords is written in one table.

[0168] Table 4 is a subset A1 table according to preferred embodiment 3, as shown in Table 4:

[0169] Table 4

[0170]

[0171] Table 5 is a subset B1 table according to the preferred embodiment 3, as shown in Table 5:

[0172] Table 5

[0173]

[0174] Table 6a is a subset A2 table according to preferred embodiment 3.

[0175] Table 6a

[0176]

[0177] Table 6b is a table of subset A2 or C according to preferred embodiment 3.

[0178] Table 6b

[0179]

[0180] Table 7 is a subset B2 table according to a preferred embodiment.

[0181] Table 7

[0182]

[0183] Table 8 is a second form table of subset B2 according to preferred embodiment 3.

[0184] Table 8

[0185]

[0186] The status bit index shown here is actually the indicator value or value in the table. In actual scheduling, the base station will use several bits to notify different status indexes. For example, 4 bits are used to notify the value of the DMRS port information. So based on the above method, if the base station semi-statically configures 2 CWs to a user, the base station will use 2Mbits+4bits in the DCI to notify the MCS / RV and DMRS port information respectively. If the MCS / RV corresponding to CW#1 in the MCS / RV information indicated by the base station is indicator 1, as described in Table 4, that is, A1, then the DMRS port information must correspond to B1.

[0187] Assume that A2 is equal to C. If the MCS / RV corresponding to CW#1 indicated by the base station is not indicator 1, that is, the set of the first information is not A1, then it can only be A2 or C. At this time, if the value of the DMRS port information indicated by the base station is a value among 0, 1, and 2, it means that CW#1 is in an activated state, and the second information set is D. Then D must correspond to C, and the first information set is C. If the MCS / RV corresponding to CW#1 indicated by the base station is not indicator 1, that is, the set of the first information is not A1, then it can only be A2 or C. At this time, the value of the DMRS port information indicated by the base station is not a value among 0, 1, and 2, then it means that CW#1 is in an inactivated state. Then the second information subset is B2. Then B2 must correspond to A2, and the first information subset is A2.

[0188] Assuming that A2 is not equal to A1 and not equal to C, the user can determine the set type of DMRS port information, B1, B2 or C, through the MCS / RV status bit indicated by the base station.

[0189] The following is a subsidiary embodiment of the preferred embodiment 3:

[0190] Preferred embodiment 3a:

[0191] For two codewords (CW), there may be inappropriate places because the separate indication of MCS, RV and / or NDI may exist, such as some combinations of MCS and RV cannot exist, for example, when MCS=15, RV cannot be equal to 2. Therefore, it is beneficial to jointly encode MCS / RV and / or NDI for two codewords, and some useless MCS, RV, NDI combinations do not need to be included in the joint information table of MCS, RV, NDI. The following assumes that only MCS, RV are jointly encoded. As shown in Table 9, it is assumed that when one CW is activated, there are P status bits for the useful MCS, RV combination, which are used to indicate different MCS, RV information of CW#0. When two CWs are activated, many status bits are required, such as T status bits to indicate different CWs, different MCS, RV information, and at this time, the information indicated by one status bit contains the MCS, RV information of two CWs.

[0192] Table 9 is a joint coding table 1 of the preferred embodiment 3a. Table 9 shows the MCS / RV indication status of joint coding 1 and 2 CWs.

[0193] Table 9

[0194]

[0195] When a CW is activated, in order to reduce the number of status bits indicated by the DMRS port information, some status bits can be added to the above notification MCS / RV information table. Then, all the status bits of the first information set are divided into 2 subsets, A1 and A2 as shown in Table 10, and the status bits from P to 2P-1 are added as A2. A2 is actually a repetition of A1, with the same content, but different element indexes. Generally, the value of P will be less than or equal to 2^M. Therefore, it can be seen that the number of elements in A1 and A2 is the same, and the content indicated is the same, but the indication index is different. That is, the MCS / RV information indicated by the nth element in A1 and the nth element in A2 is the same, and n is a non-negative integer less than P.

[0196] A1 is associated with B1 and is used to indicate the MCS / RV information and DMRS port information status bit when a codeword is activated; A2 is associated with B2 and is used to indicate the MCS / RV information and DMRS port information status bit when a codeword is activated. B1 and B2 are not completely the same. C is associated with D. It is used to indicate the MCS / RV information and DMRS port information status bit when two codewords are activated.

[0197] That is, when the element index of the first information notified by the first communication node to the second communication node belongs to A1, the element status bit of the second information notified by the first communication node to the second communication node belongs to B1; when the element index of the first information notified by the first communication node to the second communication node belongs to A2, the element status bit of the second information notified by the first communication node to the second communication node should belong to B2; when the element index of the first information notified by the first communication node to the second communication node belongs to C, the element status bit of the second information notified by the first communication node to the second communication node should belong to D.

[0198] Since the value of T is generally the square of P, that is, much larger than P, adding P values ​​to the first information set element may not cause an increase in overhead.

[0199] Of course, the first information set can be further divided into more subsets to correspond to more different second information set subsets, which can further reduce the overhead. This will not be repeated here.

[0200] Table 10 is a joint coding table 2 according to the preferred embodiment 3a. As shown in Table 10, the MCS / RV indication states of the joint coding of 1 and 2 CWs are divided into 3 subsets.

[0201] Table 10

[0202]

[0203] Preferred embodiment 3b:

[0204] In combination with the solution in the above embodiment, the MCS / RV indication status bit corresponding to a CW is divided into N subsets, and the DMRS port information indication status bit required for a CW is also divided into N subsets, and then associated. When dividing the DMRS port information indication status bit, the division can be performed according to the following rules. That is, the demodulation reference signal port information indicated by the elements of the second information set subsets B1 and B2 is different in at least one of the following characteristics

[0205] Scrambling sequence, port number, number of ports, whether it is transmitted simultaneously with data, number of DMRS symbols, and time domain code.

[0206] Scrambling sequences refer to different scrambling IDs, similar to different n in LTE. SCID For example, the scrambling sequence ID indicated by the elements contained in B1 is n SCID = 0, and the scrambling sequence ID indicated by the elements contained in B2 is n SCID=1. Optionally, only for the elements whose number of DMRS ports is less than or equal to L, the scrambling sequence ID indicated by the elements contained in B1 and the scrambling sequence ID indicated by the elements contained in B2 are different. For example, L=2, that is, the scrambling sequence ID indicated by all status bits indicating that the number of DMRS ports is less than or equal to 2 in B1 is 0, and the scrambling sequence ID indicated by all status bits indicating that the number of DMRS ports is less than or equal to 2 in B2 is 1.

[0207] Different port numbers mean that the DMRS port numbers indicated by the elements included in B1 are different from the DMRS port numbers indicated by the elements included in B2. For example, the DMRS port numbers indicated by the elements included in B1 are all less than or equal to 4, while the DMRS port numbers indicated by the elements included in B2 are all greater than 4.

[0208] Different number of ports means that the number of DMRS ports indicated by the elements included in B1 is different from the number of DMRS ports indicated by the elements included in B2. For example, the number of DMRS ports indicated by the elements included in B1 is less than or equal to 4, while the number of DMRS ports indicated by the elements included in B2 is greater than 4.

[0209] The number of DMRS symbols means that the number of DMRS symbols indicated by the elements included in B1 is different from the number of DMRS symbols indicated by the elements included in B2. For example, the number of DMRS symbols indicated by the elements included in B1 is all equal to 1, while the number of DMRS symbols indicated by the elements included in B2 is all equal to 2.

[0210] The time domain code used by the DMRS port means that the time domain code used by the DMRS port indicated by the element contained in B1 is different from the time domain code used by the port indicated by the element contained in B2. For example, the time domain code used by the DMRS port indicated by the element contained in B1 is OCC code [1 1], while the time domain code used by the DMRS port indicated by the element contained in B2 is OCC code [1-1].

[0211] Whether or not to transmit data simultaneously means that the state of whether the DMRS indicated by the elements included in B1 is transmitted simultaneously with the data is different from that of B2. For example, the DMRS indicated by the elements included in B1 will not be transmitted simultaneously with the data, while the DMRS indicated by the elements included in B2 will be transmitted simultaneously with the data.

[0212] Preferred embodiment 4

[0213] according to Figure 4-7 As shown, although these DMRS patterns can support multiple DMRS ports, such as Figure 4 , Figure 5 , Figure 6 , Figure 7The DMRS patterns indicate 6, 12, 4, and 8 DMRS ports respectively. However, due to unexpected situations of services, the base station may allocate only a few ports to users or may allocate all ports to users during scheduling. When allocating ports, these ports may be allocated to one user or to multiple users. In order to maximize flexibility, the base station needs to indicate to users whether the resources occupied by some DMRS ports are used for data transmission.

[0214] In order to achieve the most flexible scheduling, when the number of DMRS ports required is relatively small, the base station only needs to allocate a small number of ports to users, and the resources occupied by the remaining ports can be used to send data to users. When the number of DMRS ports required is relatively large, the base station must allocate multiple ports to users. At this time, the resources occupied by the DMRS ports are very small or cannot be used to transmit data to users. Figure 4 As shown, for example, when the number of DMRS ports scheduled by the base station for a user #0 is 1, and the assigned port is p#0, if there is no other user to perform multi-user transmission with this user, the base station can send data to user #0 on the REs occupied by p#2, p#3, p#4, and p#5. At this time, the base station needs DCI signaling to indicate whether the user has data to send or receive on port group #1 (including p#2, p#3) and port group #2 (including p#4, p#5). If the base station allocates DMRS ports p2, p#3, p#4, and p#5 to UE#1, all DMRS ports cannot be used for data transmission. The DMRS information notification is shown in Table 11, where the resources occupied by each port or port group need to be indicated to the user by the base station whether they are used for data transmission.

[0215] However, this flexible port indication notification brings huge physical layer dynamic signaling overhead. After allocating port p#0 to user #0, the base station also needs to indicate to the user whether the resources occupied by port group #1 are used for data transmission or sending, and also needs to indicate to the user whether the resources occupied by port group #2 are used for data transmission or sending. This is because SU-MIMO and MU-MIMO are dynamically switched, and it is possible that other users only occupy the resources of port group #1, or it is possible that other users occupy the resources of port groups #1 and #2 at the same time.

[0216] Table 11 is a table showing whether the DMRS indication information according to the preferred embodiment 4 includes an indication table of whether data is transmitted or not.

[0217] Table 11

[0218]

[0219] In other words, the indication of the DMRS port information includes whether the resources occupied by certain DMRS ports are used to send data. If the base station indicates that the resources occupied by certain DMRS ports are used to transmit data to the user, the data symbol of the user must include the symbol where the DMRS is located.

[0220] Due to the pursuit of flexibility in NR, the starting position of the data may also be notified to the user. In order to save overhead, the starting position of the DMRS and the port information indication of the DMRS can be jointly encoded or jointly signaled.

[0221] For example, DMRS has only one symbol, such as Figure 4 As shown. If the starting position of the data is the mth symbol in a time slot, and the DMRS symbol is the nth symbol, n=3, and m>n, that is, the data is sent after the DMRS, then the base station no longer needs to signal to indicate to the user whether certain DMRS ports are used for data transmission. If m<=n, that is, the data may be transmitted on the DMRS symbol, then the base station needs to signal to indicate to the user whether certain DMRS ports are used for data transmission or not. Therefore, when m>n, the signaling overhead for indicating DMRS port information is small, while when m<=n, the signaling overhead is large. If the notification of m and the indication of DMRS port information are performed separately, then the notification of DMRS port information needs to be based on the maximum overhead, that is, it is necessary to indicate whether certain DMRS ports are used for data transmission. Therefore, the starting position of DMRS and the port information indication of DMRS can be jointly encoded. As shown in Table 12. It can be seen that when m>n, the number of DMRS information indication bits required is much less, because the default is that no data is transmitted on the DMRS symbol.

[0222] Table 12

[0223]

[0224] Table 12 is a table of joint coding of DMRS indication information and data starting position according to preferred embodiment 4.

[0225] Although this joint signaling notification can save overhead, the table design is cumbersome and disadvantageous to standard design because the number of table indexes is too large. Another joint signaling design method is characterized in that the port information set of the DMRS is determined by the data starting position configured by the high-level layer.

[0226] In actual configuration, the base station uses the high layer to configure a data starting position set, which includes one or more data actual positions, that is, the base station uses the high layer to configure one or more m values. If all values ​​in the data starting position set configured by the high layer are greater than the position of the DMRS symbol, then the DMRS port information set is set #1, corresponding to a table indicated by the DMRS port information, which does not indicate whether the resources of certain DMRS port groups are occupied by data, that is, the DMRS port information indication overhead is relatively small. If some values ​​in the data starting position set configured by the high layer are not greater than the position of the DMRS symbol, then the DMRS port information set is set #2, corresponding to a table indicated by the DMRS port information, and some indication bits in the table need to indicate whether the resources of certain DMRS port groups are occupied by data, that is, the DMRS port information indication overhead is relatively large. This is because the position of the DMRS is generally fixed and can be configured separately from the starting position of the data. Moreover, data transmission is not adjacent to the DMRS symbol.

[0227] Furthermore, for a DMRS with two symbols, for example, the DMRS is fixed on symbols n and n+1, if all values ​​in the data starting position set configured by the high-level layer are greater than the position n of the first DMRS symbol, then the port information set of the DMRS is set #1, corresponding to a table of DMRS port information indication, in which there is no indication of whether the resources of certain DMRS port groups are occupied by data or not, that is, the DMRS port information indication overhead is relatively small. At this time, even if the data starting position configured by the high-level layer is n+1, it is assumed that no data is transmitted on the n+1th symbol, so that simplicity can be maintained. If in the data starting position set configured by the high-level layer, some values ​​are not greater than the position n of the DMRS symbol, then the port information set of the DMRS is set #2, corresponding to a table of DMRS port information indication, in which some indication bits need to indicate whether the resources of certain DMRS port groups are occupied by data or not, that is, the DMRS port information indication overhead is relatively large.

[0228] That is to say, the DMRS port information indication set is determined by using implicit indication information, and the implicit indication information is the data starting position configured by the high-level signaling. One DMRS port information set corresponds to one DMRS information configuration table.

[0229] Another implicit indication method of DMRS port information is that the maximum number of DMRS ports is associated with the number of supplementary DMRS symbols. The more the number of supplementary DMRS symbols is, the smaller the maximum number of DMRS ports is.

[0230] like Figure 4-7As shown in the figure, for DMRS type 2, 1 symbol can support 6 ports, and 2 symbols can support a maximum of 12 DMRS ports. This is based on the premise that there is only front loaded DMRS. If the user element moves faster, only configuring the front loaded DMRS will greatly reduce the accuracy of channel estimation. Therefore, at this time, a supplementary demodulation reference signal should be configured based on the front reference signal. When configuring the supplementary reference signal, it is more appropriate to configure 1 symbol for the front reference signal, otherwise the DMRS overhead will be too large. Moreover, the number of supplementary DMRS symbols configured depends on the speed of user movement. Fig. 9 2 is a schematic diagram of a DMRS and a supplementary reference signal of type 2 according to a preferred embodiment 4 of the present invention. For example, when the user moving speed is 120 km / h, it is sufficient to configure a symbol of a supplementary reference signal, such as Fig. 9 As shown on the left. If the user's moving speed is 500km / h, the base station should configure more than 2 DMRS symbols for the user, as shown on the right of 9. Since 1 DMRS symbol supports a maximum of 6 ports, the number of ports supported for users of different speeds is 6.

[0231] However, for ultra-high-speed users, configuring 4 DMRS symbols, that is, configuring 3 supplementary DMRS symbols, is too expensive. Fig. 9 As shown on the right, 48 REs in a PRB are used for DMRS. In addition, since the user channel condition is generally poor when the user moves too fast, the power of each port can be increased by limiting the number of user ports, because the total power may be relatively constant. Therefore, when the number of supplementary reference signal symbols is large, the maximum number of DMRS ports can be limited, such as 2 or 4. Fig.10 Schematic diagram of limiting the maximum number of DMRS ports according to preferred embodiment 4 of the present invention, as shown in FIG. Fig.10 As shown, the remaining resources on the DMRS symbol are used for data transmission by default to improve transmission efficiency.

[0232] Therefore, for type 2 DMRS, it can be seen that when there is no supplementary reference signal, the preamble reference signal can be configured with a maximum of 2 symbols, supporting a maximum of 12 ports. When only one supplementary reference signal is configured, the preamble reference signal is only configured with 1 symbol. Since the supplementary DMRS is a repetition of the preamble reference signal, and one preamble reference signal symbol supports a maximum of 6 DMRS ports, when only one supplementary reference signal is configured, the system supports a maximum of 6 DMRS ports. When more than 2 supplementary reference signals are configured, such as 3 supplementary reference signal symbols, in order to save overhead, the maximum supported DMRS port can be limited to 2 or 4.

[0233] In short, the maximum number of DMRS ports supported is related to the number of supplementary DMRS symbols. The more supplementary DMRS symbols there are, the smaller the maximum number of DMRS ports. The number of DMRS ports mentioned here refers to the number of DMRS ports supported by the system. For example, the actual system supports a maximum of 4 DMRS ports, but the base station can actually schedule 1 DMRS port to the user.

[0234] Therefore, it can be said in general that the number of DMRS ports supported by the predefined limit is such that the more the number of supplementary reference signal symbols, the fewer the number of DMRS ports supported.

[0235] In addition, in order to reduce the physical layer dynamic signaling overhead without losing flexibility, another joint signaling configuration method is characterized in that:

[0236] Jointly notify N demodulation reference signal configuration parameters of K groups. Where K is an integer greater than or equal to 1. N is an integer greater than or equal to 2, and the N parameters are included in the following parameters:

[0237] Scrambling sequence, number of ports, demodulation reference signal and data multiplexing status, number of demodulation reference signal symbols, time domain OCC code, and supplementary reference signal pattern.

[0238] Furthermore, the parameters of the joint notification are configured by high-layer signaling.

[0239] Furthermore, different parameters of the joint notification correspond to different sets of DMRS port configuration information.

[0240] Furthermore, different DMRS port configuration information sets occupy the same physical layer overhead.

[0241] Furthermore, each group corresponds to a quasi-co-sited parameter set.

[0242] As mentioned before, there are many parameters involved in DMRS port configuration, which may include scrambling sequence, number of ports, demodulation reference signal and data multiplexing status, number of demodulation reference signal symbols, time domain OCC code, and supplementary reference signal pattern. The supplementary reference signal pattern mainly refers to the number of time domain symbols of the supplementary reference signal. The demodulation reference signal and data multiplexing status refers to whether DMRS is multiplexed with data. If multiplexed, the resources occupied by those DMRS port groups can be used for data transmission. This state can be achieved with a zero-power reference signal or directly configured. For example, the base station Figure 4The pattern is represented by zero-power DMRS. Zero-power DMRS is sent on ports p4 and p5. The REs occupied by ports p4 and p5 may be used to transmit data, while other reference signal positions not represented by zero-power DMRS cannot be used to send data. Therefore, different zero-power DMRS configurations correspond to different demodulation reference signal and data multiplexing states. The number of ports refers to the maximum number of DMRS ports supported. Different time domain OCC codes generally mean that the high layer can be configured with only [1 1], or including [1 1], [1-1].

[0243] High-level signaling generally refers to RRC signaling, and does not exclude RRC signaling combined with MAC signaling. Therefore, the base station uses high-level signaling to configure the joint configuration parameters for the user. As described in Tables 13a and 13b below, the base station uses high-level signaling to jointly configure the parameters of 5 DMRS. Different joint parameters configured by high-level signaling will correspond to different DMRS port information sets. At this time, it is assumed that K = 1, that is, there is only one group.

[0244] Table 13a First configuration: Joint notification of multiple DMRS parameters of one group

[0245]

[0246] Table 13b Second configuration: Joint notification of multiple DMRS parameters of one group

[0247]

[0248] Based on the joint parameters configured by different high-level layers, the DMRS port information set corresponding to Table 13a, that is, in the DMRS information parameter table 13a, the scrambling sequence must be 0, the maximum number of DMRS ports must be less than or equal to 4, and the number of symbols of the demodulation reference signal is 1, and the time domain OCC can only be [1 1]. Therefore, in the table of the corresponding DMRS port information parameter set, the information indicated by all elements must comply with these parameter configurations, such as shown in Table 14a. Since the value of each DMRS configuration parameter is limited by the joint parameters configured by the high-level layers, the number of meaningful elements in the DMRS port configuration information set is much smaller, and there are less than 16 in Table 14a, so only 4 bits are needed in the DCI. At the same time, in order to reduce the complexity of user blind detection, the size of the DCI should be consistent. In this way, the overhead of different DMRS port information sets corresponding to the joint parameters configured by different high-level layers should be kept the same. As shown in 14b, even if the number of actually meaningful elements contained is very small, less than 8, 4 bits, that is, 16 elements, are still used to represent the DMRS port set in order to unify the DCI overhead.

[0249] Therefore, in order to notify the port information of DMRS, we ensure that the number of elements in different DMRS port configuration information sets is the same, and the physical layer overhead occupied by notifying the DMRS port information is the same. The elements here include rows in the table that only have index but no content. In order to make the joint notification more powerful, at least three or four of the above demodulation parameter signal configuration information parameters can be jointly notified.

[0250] Table 14a DMRS port configuration information set 1

[0251]

[0252] Table 14b DMRS port configuration information set 2

[0253]

[0254] When K>1, N demodulation reference signal configuration parameters of multiple groups are jointly configured. K is an integer greater than or equal to 1. N is an integer greater than or equal to 2, and the N parameters are included in the following parameters: scrambling sequence, number of ports, demodulation reference signal and data multiplexing state, number of demodulation reference signal symbols, time domain OCC code, supplementary reference signal pattern. The parameters of the joint notification are configured by high-level signaling. Each group corresponds to a quasi-co-site parameter set. It is worth noting that the QCL parameters corresponding to each group can be configured the same or differently.

[0255] Because NR divides the DMRS port into multiple port groups when transmitting multiple TRPs, each port group corresponds to a QCL parameter configuration set. Different parameter sets may correspond to different TRPs. Therefore, for different TRPs, the configuration parameters of DMRS are preferably different. For example, K=2, which may represent 2 TRPs transmitting data to one user, so the base station will include 2 QCL parameter sets when configuring QCL parameters in high-level signaling, and each set contains reference signals required for quasi-co-site. As described in Table 15, the base station uses high-level signaling to jointly configure 3 DMRS parameters of 2 groups. For 2 groups, the parameter values ​​can be different. The corresponding DMRS configuration set table is shown in Table 15b. Among them, when the total number of Layers is 1, it is defaulted that there is actually only 1 port group, because 1 port cannot be split into 2 groups.

[0256] Table 15a First configuration: Joint notification of multiple DMRS parameters of two groups

[0257]

[0258] Table 15b corresponds to the DMRS configuration set of Table 15a

[0259]

[0260] The base station jointly notifies the parameters of K groups. If the N parameter values ​​of the K groups notified are different, different DMRS port configuration information sets will be generated. Similarly, the physical layer overheads occupied by different DMRS port configuration information sets should be the same.

[0261] Preferred embodiment 5:

[0262] According to the above preferred embodiment 3, each codeword (CW) in LTE will have a corresponding MCS, RV, NDI indication field, and there are a total of 2 codewords corresponding to 2 transport blocks (TB) to transmit data. For each transport block, the base station configures 1 MCS / RV / NDI (modulation coding mode / redundancy version / new data indicator) indication field (5+1+2=8 bits) for each CW in the DCI. As shown in 36.212, MCS requires 5 bits, NDI requires 1 bit, and RV requires 2 bits. Although the MCS / RV / NDI fields corresponding to the two CWs always exist, the base station can only schedule one CW and deactivate the other at certain times. After receiving one or two TBs sent by the base station, the user demodulates the data, and then feeds back an A / N for each TB block, indicating whether the corresponding TB demodulation is correct. If the demodulation is correct, the user feeds back A, otherwise it feeds back N. When only one TB is sent, only 1 bit needs to be fed back, such as 0 for demodulation error and 1 for demodulation correct. When the base station sends 2 TB to the user, the user needs to feedback 2 bits of A / N.

[0263] When the number of DMRS ports sent by the base station to the user is large, that is, when the number of data layers sent is large or the resources allocated to the user is large, since there are only 2 TBs, the amount of data transmitted in each TB is large. At this time, just like LTE, when channel coding is performed, a TB (transmission block) is too large and must be divided into multiple CBs (codeblocks). If an A / N is fed back for each TB as in LTE, as long as one CB in the TB is transmitted incorrectly, the entire TB needs to be retransmitted, even if the other CBs are transmitted correctly. This is not conducive to improving transmission efficiency. If a TB is divided into many CBs, and an A / N is fed back for each CB, the feedback overhead is too much. In order to compromise the feedback overhead and transmission efficiency, one or more CBs can be grouped into a CB group, that is, a CBG (code block group), and an A / N is fed back for each CBG. The base station will set a separate NDI field for each CBG during scheduling. Among them, NDI is used to indicate whether the CBG corresponding to a transmission is new data or old data.

[0264] First, the base station configures the total number of code block groups X1, or the total number of bits of A / N feedback X2, or the total number of bits of new data indication X3 through high-level signaling. The total number is the sum of the numbers corresponding to all code words. X is a general term for X1, X2, and X3, that is, X can represent X1, X2, or X3.

[0265] Since the number of codewords changes dynamically, in order to ensure that X is constant, the X value corresponding to each codeword should change dynamically, that is, it is related to X and the number of codewords scheduled at a certain time. If for time slot #0, the number of codewords scheduled by the base station to the user is 1, then the number of code block groups of the codeword is X1, the number of A / N bits fed back by the user for the codeword is X2, and the number of bits used by the base station to indicate new data to the user is X2. If for time slot #1, the number of codewords scheduled by the base station to the user is 2, then the sum of the number of code block groups of the two codewords is X1, the sum of the number of A / N bits fed back by the user for the two codewords is X2, and the sum of the number of bits used by the base station to indicate new data to the user for these two codewords is X2. Therefore, for different numbers of codewords, the number of code block groups, the number of A / N bits, and the number of NDI bits corresponding to each codeword will be different. That is, the number of code block groups corresponding to a codeword, the number of A / N feedback ratios corresponding to a codeword, or the number of new data indication bits corresponding to a codeword will depend on the number N of transmitted codewords.

[0266] Since different codewords experience different channel conditions, the resources that the base station finally allocates to a user for multiple codewords are also different. For example, the TB size, MCS, and number of layers of the two CWs allocated to a user by the base station can be different. This is because the CQI of the two codewords fed back to the base station by the user is different. Therefore, the number of CBGs X1_k configured for different codewords, or the number of bits of A / N feedback X2_k, or the number of bits indicated by new data X3_k can be different, where the subscript k represents the codeword number. For example, if there are 2 CWs in total, then k = 0, 1; and if there are 3 CWs, k can be equal to 0, 1, 2.

[0267] Therefore, considering the channel conditions of different codewords, for example, the size of the TB allocated to codeword 0 is larger than that of codeword 1, the number of CBGs configured by the high-level layer or predefined can be allocated to codeword 0, that is, X1_0>X1_1, or X2_0>X2_1, or X3_0>X3_1. Similar rules are as follows. The parameter is X1_k, or X2_k, or X3_k.

[0268] Rule 1: The parameters of codewords with more layers are larger, and the parameters of codewords with fewer layers are smaller;

[0269] Rule 2: The codeword with large TB has large parameters, and the codeword with small TB has small parameters;

[0270] Rule 3: The codeword with a large MCS has a large parameter, and the codeword with a small MCS has a small parameter;

[0271] Rule 4: The codeword parameter with a large CQI feedback is large, and the codeword parameter with a large CQI feedback is large;

[0272] Generally, the base station will use DCI to dynamically notify each CBG whether it is new data, that is, notify an NDI for each CBG. In order to ensure that the load size of DCI is constant.

[0273] This method is particularly suitable when X is not an integer multiple of the number of codewords N, that is, X divided by N is not an integer. For example, the high-level configuration X1 is equal to 5, and the number of codewords allocated to the user by the base station is 2. At this time, it is impossible to have 2.5 CBGs for each codeword. Therefore, according to the above centralized rules, it can be determined which codeword has a large number of CBGs and which codeword has a small number of CBGs. For rule 4, when users generally provide channel condition feedback, they will feedback different CQIs for different codewords. The base station can use this CQI to determine which codeword corresponds to a large or small X1 / X2 / X3.

[0274] One method is that, for a parameter, for a codeword with a large parameter, the parameter is equal to X divided by N and rounded up, or for a codeword with a small parameter, the parameter is equal to X divided by N and rounded down. For example, for the number of CBGs of a codeword, if codeword 0 contains more CBGs, then X1_0 is equal to X divided by N rounded up. For example, X1=5, N=2, then X1 divided by N is equal to 2.5, and the rounded position is 3, that is, rounding up is to take an integer that is larger than a decimal and closest to this decimal. At this time, X1_1 is equal to 5-3=2. Because the sum of the number of CBGs corresponding to the codewords must be equal to 5.

[0275] Optionally, for a codeword, the parameter is equal to the number of layers contained in the codeword multiplied by X and then divided by the total number of layers of all codewords, and then rounded. For example, X=5, codeword 0 contains 3 layers, and codeword 1 contains 2 layers, then X1_0 is equal to the number of layers contained in codeword 0 multiplied by 3 times X, and then divided by the total number of layers 5, that is, X1_0 is equal to 3. For example, X=5, codeword 0 contains 1 layer, and codeword 1 contains 2 layers, then X1_0 is equal to the number of layers contained in codeword 0 multiplied by 1 times 5, and then divided by the total number of layers 3, that is, X1_0 is equal to three-fifths, and the rounding back is 2 or 1. The rounding here can be predefined as rounding up or rounding down.

[0276] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0277] Embodiment 2

[0278] In this embodiment, a configuration device for reference signal information is also provided, which is used to implement the above embodiments and preferred implementation modes, and the descriptions that have been made are omitted. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0279] According to another embodiment of the present invention, a device for notifying reference signal information is provided, which is applied to a first communication node, and the device includes:

[0280] An acquisition module, used to acquire a first information set A and a second information set B, divide the first information set A and the second information set B into N subsets respectively, and associate the first information set subset Ai and the second information set subset Bi, wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode MCS, redundant version RV information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the subset Bi belongs to a codeword;

[0281] The first sending module is used to send the first information set A and the second information set B to a second communication node.

[0282] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the above-mentioned first communication node can all be executed by the configuration device of the reference signal information.

[0283] According to another embodiment of the present invention, there is also provided a DMR port information configuration device, which is applied to a first communication node and includes:

[0284] A setting module, used for presetting one or more demodulation reference signal port groups;

[0285] A second sending module is used to indicate the following information to the second communication node through signaling: whether the resources occupied by the preset demodulation reference signal port group are used to send data;

[0286] Among them, the first communication node and the second communication node agree that the resources occupied by the non-preset demodulation reference signal port group cannot be used to send data, and no signaling is required to indicate whether data is sent on the non-preset demodulation reference signal port group resources; wherein the number of the non-preset port groups is at least 2, and the demodulation reference signal ports in the same port group occupy the same time-frequency resources.

[0287] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the first communication node can all be executed by the DMR port information configuration device.

[0288] According to another embodiment of the preferred embodiment of the present invention, there is also provided a DMR port information configuration device, which is applied to a first communication node and includes:

[0289] The third sending module is used to send a joint notification to the second communication node; wherein the joint notification includes at least one of the following information: DMRS port information and the starting position of data transmission; the maximum number of DMRS ports and the number of supplementary DMRS symbols.

[0290] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the first communication node can all be executed by the DMR port information configuration device.

[0291] According to another embodiment of the present invention, a control signaling configuration device is further provided, which is applied to a first communication node, and includes:

[0292] A determination module is used to determine at least one of the following parameters according to the number N of code words in the transmission data: the number of code block groups corresponding to one code word, the number of ACK / NACK feedback bits corresponding to one code word, and the number of new transmission data indication bits corresponding to one code word, wherein N is an integer.

[0293] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the above-mentioned first communication node can all be executed by the configuration device of the control signaling.

[0294] According to another embodiment of the present invention, a device for notifying reference signal information is further provided, which is applied to a second communication node, and the device includes:

[0295] The first receiving module is configured to receive a first information set A and a second information set B sent by a first communication node,

[0296] Among them, the first communication node divides the first information set A and the second information set B into N subsets respectively, and associates the first information set subset Ai and the second information set subset Bi, wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; wherein the elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode MCS, RV information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the subset Bi belongs to a codeword.

[0297] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the above-mentioned second communication node can all be executed by the configuration device of the reference signal information.

[0298] According to another embodiment of the present invention, there is also provided a DMR port information configuration device, which is applied to a second communication node and includes:

[0299] A second receiving module is used to receive the following information sent by the first communication node: whether the resources occupied by the demodulation reference signal port group preset by the first communication node are used to send data;

[0300] Among them, the first communication node and the second communication node agree that the resources occupied by the non-preset demodulation reference signal port group cannot be used to send data, and no signaling is required to indicate whether data is sent on the non-preset demodulation reference signal port group resources; wherein the number of the non-preset port groups is at least 2, and the demodulation reference signal ports in the same port group occupy the same time-frequency resources.

[0301] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the second communication node can all be executed by the DMR port information configuration device.

[0302] According to another embodiment of the present invention, there is also provided a DMR port information configuration device, which is applied to a second communication node and includes:

[0303] A third receiving module, configured to receive a joint notification sent by the first communication node;

[0304] The joint notification includes at least one of the following information: DMRS port information and a starting position of data transmission; a maximum number of DMRS ports and a number of supplementary DMRS symbols.

[0305] It should be supplemented that, in the method embodiment of embodiment 1, the method steps executed by the second communication node can all be executed by configuring the DMR port information.

[0306] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0307] Embodiment 3

[0308] According to another embodiment of the present invention, a processor is provided, and the processor is used to run a program, wherein the program executes the method described in any one of the above optional embodiments when running.

[0309] Embodiment 4

[0310] According to another embodiment of the present invention, a storage medium is further provided, wherein the storage medium includes a stored program, wherein the program executes the method described in any one of the above optional embodiments when running.

[0311] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0312] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0313] Finally, a Chinese-English comparison table of technical terms recorded in this application document is given as follows:

[0314]

Claims

1. A method for configuring reference signal information, characterized in that: The method comprises: Obtain a first information set A and a second information set B, divide the first information set A and the second information set B into N subsets respectively, and associate the first information set subset Ai and the second information set subset Bi, including: when the first communication node of the communicating parties notifies the second communication node that the second information belongs to the second information set subset Bi, the first communication node notifies the second communication node that the first information must belong to an element in the first information set subset Ai; wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; The elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode, redundant version information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the set B belongs to a codeword.

2. The method according to claim 1, characterized in that The subsets Bi and Bj of the second information set are different, wherein i is not equal to j, and both i and j are natural numbers starting from 1 and less than or equal to N.

3. The method according to claim 2, characterized in that In the demodulation reference signal port configuration information indicated by the elements of Bi and Bj, at least one of the following features is different: Scrambling sequence, port number, number of ports, whether it is transmitted simultaneously with the data transmission process, demodulation reference signal, number of demodulation reference signal symbols, and time domain code.

4. The method according to claim 1 or 2, characterized in that: The subsets Ai and Aj of the first information set are different, wherein i is not equal to j, and both i and j are natural numbers starting from 1 and less than or equal to N.

5. The method according to claim 4, characterized in that The elements indicating the second codeword in the Ai, Aj are different.

6. The method according to claim 4, characterized in that The elements contained in Ai and Aj have the same information content, but different element indexes.

7. The method according to claim 1, characterized in that The method further comprises: Acquiring a third information set C and a fourth information set D, and associating the third information set C and the fourth information set D, comprising: when a first communication node of both communicating parties notifies a second communication node that the fourth information belongs to the fourth information set D, the first communication node notifies the second communication node that the third information must belong to an element in the third information set C; The elements in the third information set C are used to indicate one of the following information: modulation and demodulation mode, redundant version information; The elements in the fourth information set D are used to indicate demodulation reference signal port configuration information, and the demodulation reference signal ports indicated by the elements in the fourth information set belong to two codewords.

8. The method according to claim 7, characterized in that The fourth information set D, compared with the subset of the second information set B, has at least different element indices.

9. The method according to claim 7 or 8, characterized in that: A subset of the first information set A is the same as the third information set C.

10. A device for notifying reference signal information, applied to a first communication node, characterized in that: The device comprises: An acquisition module, used to acquire a first information set A and a second information set B, divide the first information set A and the second information set B into N subsets respectively, and associate the first information set subset Ai and the second information set subset Bi, including: when the first communication node of the communicating parties notifies the second communication node that the second information belongs to the second information set subset Bi, the first communication node notifies the second communication node that the first information must belong to an element in the first information set subset Ai; wherein N is a positive integer greater than 1, and i is a natural number starting from 1 and less than or equal to N; The elements in the first information set A are used to indicate at least one of the following: modulation and demodulation mode, redundant version information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal port indicated by the elements of the subset Bi belongs to a codeword; The first sending module is used to send the first information set A and the second information set B to a second communication node.

11. A storage medium, characterized in that: The storage medium includes a stored program, wherein the program executes the method described in any one of claims 1 to 9 when executed.

12. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method described in any one of claims 1 to 9 when running.

Images