CN108111275B

CN108111275B - Method and device for configuring reference signal information

Info

Publication number: CN108111275B
Application number: CN201710687676.6A
Authority: CN
Inventors: 蒋创新; 李儒岳; 王飞鸣; 鲁照华; 张楠; 张淑娟; 陈艺戬
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2022-01-28
Anticipated expiration: 2037-08-11
Also published as: CN108111275A; WO2019029401A1; CN114710243A

Abstract

The invention provides a method and a device for configuring reference signal information, wherein the method comprises the following steps: 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 the element in the first information set A is used for indicating 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, where the demodulation reference signal ports indicated by the elements of the set B belong to one codeword. By adopting the technical scheme, the first information set and the second information set are obtained, and the two information sets are sent to the communication node of the opposite terminal in a correlation manner, so that the problem of high cost for informing the DMRS port configuration information in the related technology is solved, and the DMRS port configuration information cost is greatly reduced.

Description

Method and device for configuring reference signal information

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for configuring reference signal information.

Background

In the related art, for the demodulation reference signal, if the corresponding data is configured to be transmitted on the time domain symbol where the demodulation reference signal is located, the power of the demodulation reference signal cannot be increased, and a large amount of extra signaling is required to indicate whether the data is transmitted on the time domain symbol where the demodulation reference signal is located. If data is not configured to be sent on the time domain symbol where the demodulation reference signal is located all the time, signaling overhead is reduced, but transmission efficiency may be reduced.

Currently, New Radio (NR) physical layer technology is under fire-thermal discussion in 3rd Generation Partnership Project (3 GPP) RAN 1. While flexibility and efficiency have been the goals pursued by NR physical layer design. The pursuit of maximum flexibility for physical layer reference signals also seems to be a trend. This is because the requirements for demodulating the reference signal may be different for different application scenarios.

For a user with a higher delay requirement, the user needs to receive downlink data in a time slot and then feed back a signal indicating whether the downlink data transmission is correct or not to the base station. That is, the downlink physical transmission resources allocated to the user by the base station and ACK/NACK (correct/incorrect) feedback corresponding to whether or not the user is correctly received are in the same slot. In this case, for fast demodulation, the demodulation reference signal is placed at the front position in the time slot, so that the user can quickly detect the demodulation reference signal for data demodulation. Fig. 1 is a schematic diagram of DMRS in data transmission in the related art, 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 may be referred to as self-contained time slot (self-contained slot), so that the time delay of ACK/NACK feedback can be greatly reduced, thereby facilitating service transmission with high timeliness requirement. In fig. 1, the time slot includes 14 OFDM symbols, the base station schedules downlink data to the user through downlink control channels of the first two symbols, and places a demodulation reference signal on the 3rd and 4 th time domain symbols, and after the user detects the downlink data, the user feeds back ACK/NACK on the last 2 symbols of the time slot. And if the user correctly detects the downlink data channel, the user feeds back to the base station ACK, otherwise, the user feeds back to the base station NACK.

In general, in order to support such a self-contained slot structure, the reference signal design related to demodulation should be as favorable as possible for fast demodulation, thereby realizing ACK/NACK fast feedback. For example, the demodulation reference signal is preferably placed on the first several OFDM symbols of the downlink data channel, and such a demodulation reference signal placed at the front of the slot is called a front loaded DMRS.

For uplink data transmission, due to the fact that services such as V2V and D2D may also need low time delay, the pre-demodulation reference signal is also beneficial to fast demodulation and feedback.

For users or services with low delay requirements, the ACK/NACK feedback does not need to be too fast, and the ACK/NACK feedback can be later than the downlink data channel by several time slots. In this case, the design of the demodulation reference signal is not limited to only the preamble demodulation reference signal, and the supplemental demodulation reference signal can also be transmitted for doppler estimation. Fig. 2 is a diagram illustrating a pre-demodulation reference signal and a supplemental demodulation reference signal according to the related art, and as shown in fig. 2, DMRSs are distributed over 4 time-domain symbols, which is advantageous for improving doppler estimation.

Aiming at the problem of high cost of informing DMRS port configuration information in the related technology, no effective solution is available at present.

Disclosure of Invention

The embodiment of the invention provides a method and a device for configuring reference signal information, which are used for at least solving the problem of high cost of informing DMRS port configuration information in the related technology.

According to an embodiment of the present invention, there is provided a method for configuring reference signal information, the method including: 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 element in the first information set A is used for indicating at least one of the following: modulation and demodulation mode, redundant version information; and the elements in the second information set B are used for indicating demodulation reference signal port configuration information, wherein the demodulation reference signal ports indicated by the elements in the set B belong to one code word.

Optionally, the subsets Bi, Bj of the second information set are different, where i is not equal to j, and i, j are natural numbers starting from 1 and smaller than or equal to N.

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 serial number, port number, whether to transmit simultaneously with the data transmission process, demodulation reference signal symbol number and time domain code.

Optionally, the subsets Ai, Aj of the first set of information are different, where i is not equal to j, which are all natural numbers starting from 1, smaller than or equal to N.

Optionally, the elements in said Ai, Aj indicating the second codeword are different.

Optionally, the Ai, Aj may contain elements with the same information content but different element indexes.

Optionally, the method further comprises: acquiring a third information set C and a fourth information set D, and associating the third information set with the fourth information set; the element in the third information set C is used to indicate one of the following information: modulation and demodulation mode, redundant version information; the element in the fourth information set D is used to indicate demodulation reference signal port configuration information, and the demodulation reference signal port indicated by the element in the fourth information set belongs to two codewords.

Optionally, the fourth set of information D is different in at least element index compared to a subset of the second set of information B.

Optionally, a subset of the first set of information a and the third set of information C are the same.

Optionally, associating the X-th information set and the Y-th information set, where X and Y are natural numbers, including: when a first communication node of two communication parties informs a second communication node that information about the demodulation reference signal port belongs to a Y information set, the first communication node informs the second communication node that the modulation and demodulation mode and/or redundancy version information must belong to elements in an X information set.

According to another embodiment of the present invention, a method for configuring DMRS port information is provided, and includes: presetting one or more demodulation reference signal port groups; and the following information is indicated to a second communication node of the opposite terminal through signaling: whether the resources occupied by the preset demodulation reference signal port group are used for sending data or not; the communication parties agree that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether the data is sent on the non-preset demodulation reference signal port group resources; the number of the non-preset port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time-frequency resource.

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

Optionally, different demodulation reference signal port groups are preset in different second communication nodes or cells.

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

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

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

Optionally, the larger the number of the supplemental demodulation reference signal symbols is, the smaller the maximum port number of the demodulation reference signals is.

According to another embodiment of the present invention, a method for configuring control signaling is provided, where at least one of the following parameters is determined according to the number N of codewords in 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.

Optionally, for one of the parameters, the sum of the parameters corresponding to all the codewords is X, where X is predefined or configured by higher layer signaling.

Optionally, for one of said parameters, there is predefined at least one of the following rules: rule 1: the more the number of layers included in the codeword, the larger the parameter of the codeword; rule 2: the larger the transport block, TB, of the codeword, the larger the parameter of the codeword; rule 3: the larger the modulation and demodulation mode of the code word is, the larger the parameter of the code word is; rule 4: the larger the feedback channel quality indication, CQI, of the codeword, the larger the parameter of the codeword.

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

Optionally, for one of the parameters, in the case that there are at least two codewords, the parameter is equal to X divided by N and rounded up for the codeword with the large parameter, and/or the parameter is equal to X divided by N and rounded down for the codeword with the small parameter.

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

According to another embodiment of the present invention, there is also provided an apparatus for notification of reference signal information, applied to a first communication node, the apparatus including: an obtaining module, configured to 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, and associate the first information set subset Ai and the second information set subset Bi, where 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 element in the first information set A is used for indicating at least one of the following: modulation and demodulation mode, redundant version information; elements in the second information set B are used to indicate demodulation reference signal port configuration information, where demodulation reference signal ports indicated by elements of the subset Bi belong to one codeword; a first sending module, configured to send the first information set a and the second information set B to a second communication node.

According to another embodiment of the present invention, there is provided a device for configuring demodulation reference signal port information, applied to a first communication node, including: the device comprises a setting module, a receiving module and a processing module, wherein the setting module is used for presetting one or more demodulation reference signal port groups; a second sending module, configured to instruct, through a signaling, the second communication node to: whether the resources occupied by the preset demodulation reference signal port group are used for sending data or not; the first communication node and the second communication node agree that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether data is sent on the non-preset demodulation reference signal port group resources or not; the number of the non-preset port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time-frequency resource.

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

According to another embodiment of the present invention, there is also provided a configuration apparatus of a control signaling, applied to a first communication node, a determining module, configured to determine at least one of the following parameters according to a number N of codewords in 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.

According to another embodiment of the present invention, there is also provided a storage medium including a stored program, wherein the program is operable to perform the method of any of the above-mentioned alternative embodiments.

According to another embodiment of the invention, a processor for running a program is provided, wherein the program when running performs the method as described in any of the above alternative embodiments.

With the present invention, a first communication node obtains a first information set a and a 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 an element in the first information set a is used to indicate at least one of: modulation and demodulation scheme MCS and redundancy version RV information; elements in the second information set B are used to indicate demodulation reference signal port configuration information, wherein the demodulation reference signal ports indicated by the elements of the subset Bi belong to one codeword; the first communication node sends the first set of information a and the second set of information B to a second communication node. By adopting the technical scheme, the two information sets are associated and sent to the communication node of the opposite terminal, the problem of high cost for informing the DMRS port configuration information in the related technology is solved, and the DMRS port configuration information cost is greatly reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a diagram of DMRS in data transmission according to the related art;

fig. 2 is a diagram of a pre-demodulation reference signal and a supplementary demodulation reference signal according to the related art;

fig. 3 is a flowchart of a method for configuring reference signal information according to an embodiment of the present invention;

fig. 4 is a diagram one of DMRS type 2 in accordance with the preferred embodiment 1 of the present invention;

fig. 5 is a diagram two of DMRS type 2 in accordance with the preferred embodiment of the present invention 1;

fig. 6 is a diagram one of DMRS type 1 in accordance with the preferred embodiment 1 of the present invention;

fig. 7 is a diagram two of DMRS type 1 in accordance with the preferred embodiment of the present invention;

fig. 8 is a diagram of base station configured DMRS symbols according to preferred embodiment 2 of the present invention;

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

fig. 10 is a diagram for limiting the maximum number of ports of DMRS according to preferred embodiment 4 of the present invention.

Detailed Description

It should be noted that, in the embodiments of the present application, a mobile communication network (including but not limited to a 5G mobile communication network) is provided, and a network architecture of the network may include a network side device (e.g., a base station) and a terminal. In this embodiment, an information transmission method capable of operating on the network architecture is provided, and it should be noted that an operating environment of the information transmission method provided in this embodiment is not limited to the network architecture.

The first communication node in this document may be a base station side device, and the second communication node may be a terminal side device, although it is not excluded that the first communication node and the second communication node are both terminal devices, and both perform D2D communication.

Example one

In this embodiment, a configuration of reference signal information operating in the network architecture is provided, and fig. 3 is a flowchart of a configuration method of reference signal information according to an embodiment of the present invention, as shown in fig. 3, the flowchart includes the following steps:

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;

step S304, wherein the elements in the first information set A are used for indicating 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, where the demodulation reference signal ports indicated by the elements of the set B belong to one codeword.

Through the steps and by adopting the technical scheme, the first information set and the second information set are obtained, and the two information sets are sent to the communication node of the opposite terminal in a correlation manner, so that the problem of high cost for informing DMRS port configuration information in the related technology is solved, and the DMRS port configuration information cost is greatly reduced.

Alternatively, the main body of the above steps may be a base station, a terminal, etc., but is not limited thereto.

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

Optionally, the subsets Ai, Aj of the first set of information are different, where i is not equal to j, which is a natural number starting from 1, smaller than or equal to N.

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

Optionally, the Ai, Aj contains elements that indicate the same information content but different element indices.

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 acquires a third information set C and a fourth information set D, and associates the third information set and the fourth information set; the element in the third information set C is used to indicate one of the following information: MCS, RV information; the element in the fourth information set D is used to indicate demodulation reference signal port configuration information, and the demodulation reference signal port indicated by the element in the fourth information set belongs to two codewords.

Optionally, the fourth set of information D has a different element index than the subset of the second set of information B.

Optionally, associating the X-th information set and the Y-th information set, where X and Y are natural numbers, includes: in case the first communication node informs the second communication node that an element of the xth information set belongs to the yth information set, the first communication node informs the second communication node that an element of the yth information set must belong to the xth information set. It should be noted that in this embodiment, the meaning of associating two sets in the present document is described, and the association method described above is also applicable to associating two subsets.

According to another embodiment of the present invention, there is also provided a method for configuring DMR port information, including the steps of:

step one, a first communication node presets one or more demodulation reference signal port groups;

step two, the first communication node indicates the following information of the second communication node through signaling: whether the resources occupied by the preset demodulation reference signal port group are used for sending data or not; the first communication node and the second communication node appoint that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether the data is sent on the non-preset demodulation reference signal port group resources or not; the number of the non-preset port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time frequency resource.

By adopting the technical scheme, the expense for informing the DMRS port configuration information is saved, and the DMRS channel accuracy is improved.

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

Optionally, different demodulation reference signal port groups are preset by different second communication nodes or cells.

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

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 the starting position of data transmission; the maximum port number of the DMRS and the number of the supplementary DMRS symbols.

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

Optionally, the larger the number of the supplementary DMRS symbols is, the smaller the maximum number of ports of the DMRS is.

According to another embodiment of the present invention, there is provided a method for configuring control signaling, which may be applied to a first communication node, the method including the steps of:

determining 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.

By adopting the technical scheme, the problem of control signaling overhead increase caused by code word dynamic change in the related technology is solved, and even under the condition of code word dynamic change, the overhead of the control signaling is kept unchanged, so that the user detection complexity is reduced.

Optionally, for one such parameter, there is predefined at least one of the following rules: rule 1: the more the number of layers included in the codeword, the larger the parameter of the codeword; rule 2: the larger the transport block TB of the codeword, the larger the parameter of the codeword; rule 3: the larger the modulation and demodulation scheme MCS of the code word is, the larger the parameter of the code word is; rule 4: the larger the feedback channel quality indication CQI for the codeword, the larger the parameter for the codeword.

Optionally, for a codeword with a parameter greater than a first preset value, the parameter is equal to X divided by N and rounded up, and/or for a codeword with a parameter less than a second preset value, the parameter is equal to X divided by N and rounded down.

Alternatively, for a codeword, the parameter is equal to the number of layers that the codeword contains multiplied by X divided by the total number of layers for all codewords, and then rounded.

According to another embodiment of the present invention, there is also provided a method for notifying reference signal information, the method being applied to a second communication node, the method including the steps of:

a second communication node receives a first information set A and a second information set B sent by a 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 element in the first information set A is used for indicating at least one of the following: modulation and demodulation scheme 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 ports indicated by the elements of the subset Bi belong to one codeword.

Optionally, the method further comprises: 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 with the fourth information set.

Optionally, the element in the third set of information is used to indicate one of the following information: MCS, RV information; the element in the fourth information set is used to indicate demodulation reference signal port configuration information, and the demodulation reference signal port indicated by the element in the fourth information set belongs to two codewords.

Optionally, associating the set of X-th information with the set of Y-th information: in the case where the first communication node notifies the second communication node that an element of the xth information set belongs to the yth information set, the first communication node notifies the second communication node that an element of the yth information set must belong to the xth information set; wherein X and Y are natural numbers.

According to another embodiment of the present invention, there is provided a method for configuring DMR port information, the method being applicable to a second communication node, the method including the steps of:

the second communication node receives the following information sent by the first communication node: whether the resource occupied by the demodulation reference signal port group preset by the first communication node is used for sending data or not; the first communication node and the second communication node appoint that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether the data is sent on the non-preset demodulation reference signal port group resources or not; the number of the non-preset port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time frequency resource.

According to another embodiment of the present invention, there is provided a method for configuring DMR port information, the method including the steps of:

the second communication node receives the joint notification sent by the first 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 port number of the DMRS and the number of the supplementary DMRS symbols.

The following detailed description is given with reference to preferred embodiments of the present invention.

Preferred embodiment 1: scheme for DMRS type 2

Currently, for the design of a reference signal, a DMRS pattern based on FD-occ (frequency domain orthogonal coding code), which is called DMRS type 2, can effectively support a maximum of 6 ports (as shown in fig. 4) in one DMRS symbol and a maximum of 12 ports (as shown in fig. 5) in 2 DMRS symbols.

Fig. 4 is a first schematic diagram of DMRS type 2 in preferred embodiment 1 of the present invention, as shown in fig. 4, in an rb (resource block), an abscissa is a time domain, and an ordinate is a frequency domain. The 6 DMRS ports are divided into 3 DMRS port groups, port group #0 contains ports p0, p 1. In port group #0, ports p0 and p1 are mapped on the same time-frequency resource by means of OCC code division, for example, the OCC code for port p0 is [ 11 ], the OCC code for port p1 is [ 1-1 ], and subcarriers mapped by ports p0 and p1 in one RB include subcarriers #4 and # 5; #10, # 11. Similarly, port set #1 includes ports p2, p 3. In port group #1, ports p2 and p3 are mapped on the same time-frequency resource by means of OCC code division, for example, the OCC code for port p1 is [ 11 ], and the OCC code for port p3 is [ 1-1 ]. Port set #2 contains ports p4, p 5. In port group #2, ports p4 and p5 are mapped on the same time-frequency resource by means of OCC code division, for example, the OCC code for port p4 is [ 11 ], and the OCC code for port p5 is [ 1-1 ]. These 6 DMRS ports may be allocated to one user, i.e., SU-MIMO (single-user MIMO), or may be allocated to multiple users, i.e., MU-MIMO (multi-user MIMO). Although the pattern in fig. 4 may support a maximum of 6 DMRS ports, an actual base station does not necessarily have to allocate 6 DMRS ports to users when scheduling users. For example, when the number of users in a cell is small and the total number of ports required by the users is small, the base station only needs to send one or two ports.

In order to achieve the most flexible scheduling, when the number of the ports requiring the DMRS is relatively small, the base station only needs to allocate a small number of ports to the user, and resources occupied by the remaining ports can transmit data to the user. When the number of the required DMRS ports is large, the base station must allocate a plurality of ports to the users, and at this time, the resources occupied by the DMRS ports are little or cannot be used for transmitting data to the users. For example, when the base station schedules that the number of DMRS ports of one user #0 is 1, and the allocated port is p #0, if there is no other user performing multi-user transmission with the user, the base station may send data to the user on 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 and p #3) and port group #2 (including p #4 and p #5), respectively. However, if the base station allocates DMRS ports p2, p #3, p #4, and p #5 to UE #1, all DMRS ports are not available for data transmission.

However, such flexible port indication notification introduces a huge physical layer dynamic signaling overhead. After being allocated to port p #0 of user #0, the base station also needs to indicate whether the resource occupied by the user port group #1 is used for data transmission or transmission, and also needs to indicate whether the resource occupied by the user port group #2 is used for data transmission or transmission. This is because SU-MIMO and MU-MIMO are dynamically switched, and other users may occupy only the resources of port group #1, or other users may occupy the resources of port groups #1 and #2 at the same time.

In addition, when other users do not occupy the resources of the port groups #1 and #2, if the resources occupied by the port groups #1 and #2 are all allocated to the user #0 for data transmission, the Power on the ports p2, p3, p4 and p5 cannot be borrowed to the ports p #0 and p #1, and the DMRS of the UE #0 has no Power boosting (Power boosting). Because the density of each port of the DMRS in the DMRS pattern of the FD-OCC is very low, Power enhancement is particularly important, and Power boosting is not performed, so that the influence on channel estimation is great.

A method of solving high signaling overhead and power boosting problems, comprising the steps of:

(1) one or more demodulation reference signal port groups are preset, a first communication node needs signaling to indicate whether resources occupied by the port groups of a second communication node are used for sending data, while resources occupied by other non-preset port groups cannot be used for sending data, and signaling is not needed to indicate whether the resources of the non-preset port groups are used for sending data. Wherein, the number of the non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time frequency resource.

For UE #0, it may be preset that the demodulation reference signal port group #2 may be used for transmitting data, and for other non-preset demodulation reference signal port groups #0, #1, even if there is no other user performing multi-user MIMO with UE #0, the base station will not schedule UE #0 to transmit or receive data on the resource of port groups #0, #1, and of course, signaling indication is not needed. Thus, if the DMRS port allocated by UE #0 is on port group #0, e.g. p0, it is ensured that the power of port group #1 can be lent to port group #0, i.e. 3dB power boosting, and the channel estimation performance is ensured. Meanwhile, the base station does not need DCI dynamic signaling to inform UE #0 whether data transmission exists on port group # 1. Due to the possibility of data transmission preset on the DMRS port group #2, the base station needs to dynamically signal whether the UE #0 has data transmission on the DMRS port group # 2.

If UE #0 is allocated ports p #0, p #1, and there is no data transmission from UE #0 on port group #2 (at this time, port group #2 may be occupied by other users), then for UE #0, the power on both port groups #1 and #2 can be lent to port group #0, so that the power on port group #0 is 3 times the original power, i.e., 4.77 dB. Although the power may reach 3 times at this time, the interference to the neighbor cell from the power on port group #0 also increases, and the power of the DMRS varies, i.e., sometimes 3dB, sometimes 4.77 dB. Also has an impact on the demodulation complexity. (2) In the method, one or more demodulation reference signal port groups are preset, the first communication node needs to signal whether resources occupied by the port groups of the second communication node are used for sending data, while resources occupied by other non-preset port groups cannot be used for sending data, and the first communication node does not need to signal whether the resources occupied by the non-preset port groups are used for sending data. Wherein, the number of the non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time frequency resource. And, the power of the demodulation reference signal port is limited to a constant value N. Specifically, for demodulation reference signal type 2, one demodulation reference signal group is preset, and the power of the DMRS port is limited to 3 dB. DMRS power as used herein also refers to the power ratio between DMRS ports and for data layers. If there is no power enhancement, the power between the DMRS port and the corresponding data layer is 1:1, i.e., 0 dB.

(3) The method according to (1) or (2), further characterized in that the preset demodulation reference signal port groups of different users or cells are different. 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, which has the advantage of interfering with randomization.

(4) Further method, presetting one or more demodulation reference signal port groups refers to pre-defining or configuring DMRS port groups through signaling. Predefined means that no signalling is required, well defined in the standard, and is information known by default to the base station and the user. The signaling configuration means that the base station configures the DMRS port group through high-layer signaling and/or dynamic signaling. For example, the DMRS port group preset by the base station to the user through high layer signaling or DCI dynamic signaling is port group # 1. Optionally, the base station may configure a plurality of preset DMRS port group configurations through high-layer signaling, for example, the base station configures 2 preset DMRS port group configurations through high-layer signaling, where port group configuration #0 includes port group #1, and port group configuration #1 includes port group #2, and then the base station selects one of the 2 port group configurations to notify the user through dynamic DCI signaling. The higher layer signaling can be RRC signaling or MAC signaling or RRC signaling combined with MAC signaling.

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

Fig. 5 is a diagram of DMRS type 2 in the preferred embodiment 1, where as shown in fig. 5, a maximum of 12 DMRS ports can be supported for 2 DMRS symbols. The 12 DMRS ports are divided into 3 DMRS port groups, port group #0 contains ports p0, p1, p6, p 7; port set #1 contains ports p2, p3, p8, p 9; port set #2 contains ports p4, p5, p10, p 11. In port group #0, the ports p0, p1, p6 and p7 occupy the same time-frequency resource, and only use different time-domain or frequency-domain OCC codes. For example, p0, p1 are distinguished by the OCC code in the frequency domain, and the OCC code in the time domain is the same, i.e., the OCC code in the frequency domain for p0 is [ 11 ], the OCC code in the frequency domain for port p1 is [ 1-1 ], and the OCC codes in the time domains for p0, p1 are [ 11 ]; the p6 and p7 are also distinguished from each other by the OCC codes in the frequency domain, and the OCC codes in the time domain are the same, i.e., the OCC code in the frequency domain for p6 is [ 11 ], the OCC code in the frequency domain for port p7 is [ 1-1 ], and the OCC codes in the time domain for p6 and p7 are [ 1-1 ]. Similarly, in the same way for 4 ports in other port groups, in port group #1, p2 and p3 use different frequency domain OCC codes, but use the same time domain OCC code, and p8 and p9 use different frequency domain OCC codes, and also use the same time domain OCC code, but the time domain OCC codes used for p2 and p3 are different from those used for p8 and p 9. In port group #2, p4 and p5 use different frequency domain OCC codes and use the same time domain OCC code, and p10 and p11 use different frequency domain OCC codes and also use the same time domain OCC code, but p4 and p5 use different time domain OCC codes from p10 and p 11.

A method for solving high signaling overhead and power enhancement problem based on 2 symbol pre-reference signal is characterized in that one or more demodulation reference signal port groups are preset, a first communication node needs signaling to indicate whether resources occupied by the port groups of a second communication node are used for sending data, while resources occupied by other non-preset port groups cannot be used for sending data, and signaling is not needed to indicate whether data are sent on the non-preset port group resources. Wherein, the number of the non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time frequency resource. Specifically, for the DMRS of type 2, since the number of port groups is 3, the specific method includes presetting 1 demodulation reference signal port group, where a first communication node needs to signal whether resources occupied by the port groups of a second communication node are used for transmitting data, and resources occupied by other non-preset port groups are not used for transmitting data, and does not need to signal whether to transmit data on the non-preset port group resources. Further, the power of the DMRS ports is limited to 3 dB.

A further method is characterized in that the set of demodulation reference signal ports preset by different users or cells is different.

Further method, presetting one or more demodulation reference signal port groups refers to pre-defining or configuring DMRS port groups through signaling. Predefined means that no signalling is required, well defined in the standard, and is information known by default to the base station and the user. The signaling configuration means that the base station configures the DMRS port group through high-layer signaling and/or dynamic signaling. For example, the DMRS port group preset by the base station to the user through high layer signaling or DCI dynamic signaling is port group # 2. Optionally, the base station may configure a plurality of preset DMRS port group configurations through high-layer signaling, for example, the base station configures 2 preset DMRS port group configurations through high-layer signaling, where port group configuration #0 includes port group #1, and port group configuration #1 includes port group #2, and then the base station selects one of the 2 port group configurations to notify the user through dynamic DCI signaling.

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

The ports p0-p11 described herein are all integers and are not necessarily consecutive integers. For example, p0-p11 may actually represent ports 1000-1011, and may in turn be 1000,1003,1001,1004,1002,1005,1006,1009,1007,1010,1008,1011.

The following are additional examples of preferred embodiment 1:

preferred embodiment 1 a: scheme for DMRS type 1

An ifdm (interleaved Frequency domain multiplexing) -based DMRS pattern, which is referred to as DMRS type 1, can effectively support a maximum of 4 ports in one DMRS symbol (as shown in fig. 6), and a maximum of 8 ports in 2 DMRS symbols (as shown in fig. 7).

Fig. 6 is a first schematic diagram of DMRS type 1 in preferred embodiment 1 of the present invention, in fig. 6, the DMRS ports are divided into 2 port groups, a port group #0 includes p0 and p2, and p0 and p2 occupy the same time-frequency resource and are distinguished by different codes, for example, by different cs (cyclic shift) sequences. Port set #1 contains p1, p3, and p1, p3 occupy the same time-frequency resource, distinguished by different codes.

Fig. 7 is a diagram two illustrating DMRS type 1 in preferred embodiment 1 of the present invention, in fig. 7, 8 ports are divided into 2 port groups, port group #0 includes p0, p2, p4, p6, p0, p2, p4, and p6 occupy the same time-frequency resource, and the codes used by p0 and p2 in the frequency domain are different, for example, CS sequence 0 is used for p0, and CS sequence 1 is used for p 2; the codes used for p4 and p6 are also different in the frequency domain. The OCC codes for p0 and p2 in the time domain are the same, and the OCC codes for p4 and p6 in the time domain are the same and different from the OCC codes for p0 and p2 in the time domain. Similarly, port group #1 includes ports p1, p3, p5, p7, and p1, p3 use different CS in frequency domain and same OCC code in time domain; p5 and p7 have different CS in frequency domain, the same OCC code in time domain, and different codes from p1 and p3 in time domain.

In summary, all ports in a port group are mapped on the same time-frequency resource and are distinguished from each other by means of different time-domain or frequency-domain codes.

The same is true for DMRS type 1, which is also used for the above-described method.

Preferred embodiment 2:

as shown in fig. 5 and 7, when there are 2 DMRS symbols, 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 certain DMRS port group cannot be used for data transmission, res (resource elements) on 2 time domain symbols occupied by the DMRS port group cannot be used for data transmission. As shown in FIG. 5, the ports allocated to UE #0 by the base station are p0, p1, p6, p7, i.e., UE #0 is scheduled for 4-layer transmission. At this time, the base station allocates a 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 in which UE #1 is located. I.e. it cannot be used to transmit data on the time-frequency resource where p4 is located, where the time-frequency resource occupied by p4 occupies 2 time-domain symbols.

Although this design is simple, resource utilization is not high. This is because the DMRSs configured for different users may be different when the base station configures 1 or 2 DMRS symbols. In this case, fig. 8 is a schematic diagram of base station configuring DMRS symbols according to preferred embodiment 2 of the present invention, and as shown in fig. 8, the base station configures two DMRS symbols to UE #0, and the ports allocated to UE #0 are p0, p1, p6, and p7, i.e., UE #0 is scheduled to be 4-layer transmission. And at this time, the base station configures one DMRS symbol to the UE #1 and allocates ports p4, p 5. Meanwhile, the base station configures two DMRS symbols to UE #2, and the allocated ports are p2, p3, p8, p 9. UE #0, UE #1 and UE #2 make multi-user transmission.

Thus for UE #1, DMRS is transmitted only on the first DMRS symbol. The vacant resources on the second DMRS symbol on the corresponding subcarrier may also be used to transmit data. That is, on time domain symbol #3, subcarrier resources #0, #1, #6, #7 may be used for transmitting data. This is because there is no need to retransmit the DMRS on the second DMRS symbol if the channel condition of UE #1 is good. At this point, the base station needs to use signaling to indicate the position of the user on the DMRS symbol where the user can use to transmit data.

For users configured with 2 DMRS symbols, the base station needs to indicate whether a subset of the resources occupied by certain DMRS port groups is used for data transmission. And dividing the resources occupied by the DMRS port group into 2 subsets, wherein the subset #0 and the subset #1 respectively occupy the resources occupied by the first DMRS symbol and the resources occupied by the second DMRS symbol of the DMRS port group. For example, the resource occupied by the port group #2 includes (2,0) (3,0) (2,1) (3,1), (2,6) (3,6) (2,7) (3,7), where (x, y) denotes a time domain symbol number and a 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 separately notify, by signaling, whether resource subset #0 and subset #1 in port group #2 can be used for data transmission.

Meanwhile, for a user configured with 1 DMRS symbol, the base station needs to indicate whether a resource group on another DMRS symbol except for the DMRS symbol allocated to the user can transmit data.

Table 1 is a table for instructing subsets of the demodulation reference signals to transmit data to users according to the preferred embodiment 2, and as shown in table 1, the base station can use different indications to instruct whether each subset on the demodulation reference signal group #2 is used for transmitting data to one user.

TABLE 1

With reference to the method in embodiment 1, that is, one or more demodulation reference signal port groups are preset, a first communication node needs to signal whether resources occupied by the port groups of a second communication node are used for sending data, while resources occupied by other non-preset port groups are not used for sending data, and does not need to signal whether data is sent on the non-preset port group resources. Wherein, the number of the non-preset port groups is at least 2. The demodulation signal ports in the same port group occupy the same time frequency resource. Further, it indicates whether the subset of the resources of the predetermined port group is used for transmitting data.

It should be noted that if the resources of the demodulation reference signal are used for transmitting the demodulation reference signal of the user, the resources cannot transmit data even if the corresponding demodulation reference signal port group of the resources is preset.

Preferred embodiment 3:

as can be seen from fig. 4 to 7, 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 DMRSs. In addition, if data and DMRS can be transmitted on the same symbol, the base station also needs to indicate to the user whether resources on certain DMRS port groups are used to transmit or receive data. This results in particularly large signaling overhead in DCI.

In LTE, for initially transmitted data, when the number of DMRS ports or the number of layers is 2 or more, 2 codewords CW (code words, simply CW), that is, 2 Transport Blocks (TB) are required to transmit the data, and the table 5.3.3.1.5C-1 or 5.3.3.1.5C-2 in the notification 36.212 of the DMRS port information is shown. And for each transport block, the base station configures 1 MCS/RV/NDI (modulation coding scheme/redundancy version/new data indicator) indication field (5+1+2 ═ 8bits) for each CW in the DCI, as shown below, the MCS needs 5bits, the NDI needs 1bit, and the RV needs 2 bits.

In addition,for transport block 1:

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

-New data indicator–1bit

-Redundancy version–2bits

In addition,for transport block 2:

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

-New data indicator–1bit

-Redundancy version–2bits

If only 1 CW is actually transmitted, i.e., the second CW is not transmitted (disabled), then in the second MCS/RV/NDI indication field, I_MCS0 and the redundancy version indication has a value of 1, as shown below in 36.213.

-In DCI formats 2,2A,2B,2C and 2D a transport block is disabled if I_MCS＝0and if rv_idx＝1otherwise the transport block is enabled.

In NR, the base station semi-statically configures the maximum number of CWs to the user through higher layer signaling according to the situation of the user. If one user can only support data transmission of 4 layers at most, 1 CW is configured because 2 CWs are required in NR when the number of DMRS ports or layers is 4 or more for the initially transmitted data. If a user has a requirement and can support 5 DMRS ports or more, the maximum number of CW configured to the user by the base station in a semi-static manner is 2. It should be noted that even if the number of CWs configured to the user by the base station through the higher layer signaling is 2, one CW can be transmitted at the time of actual transmission, and it should be noted that the total required number of ports is not more than 4. However, as long as the number of CWs configured to the user by the base station through the higher layer signaling is 2, the MCS/RV/NDI can support the MCS, RV, NDI information indication for 2 TBs.

If each CW needs 1 MCS/RV/NDI indication field M bits like LTE, the overhead of the needed MCS/RV/NDI indication fields is different for different users due to the difference of the maximum CW number. If the user is configured with 1 CW in a semi-static way, the MCS/RV/NDI indication domain needs M bits; whereas if the user is semi-statically configured with 2 CWs, the MCS/RV/NDI indication field requires 2M bits. Thus, in the case of a configuration of 2 CWs, 2 CWs are equivalent to independent coding, that is, each CW needs an independent MCS/RV/NDI field, and at this time, if the number of layers transmitted to a user is equal to or less than N, N is 4, only 1 CW is needed, that is, CW #0, and CW #1 is deactivated, which may indicate, like LTE, that CW #1 is deactivated by using a special Indicator bit of the MCS/RV field corresponding to CW #1, as shown in table 3, when the Indicator bit (Indicator) of the MCS/RV indicated by the base station in the MCS/RV field corresponding to CW #1 is 1, that is, MCS is 0, and RV is 1, CW #1 is deactivated.

Table 2 is a configuration table one according to the

preferred embodiment

3, 2 CWs are configured as shown in table 2, and MCS/RV fields of the 2 CWs are independently encoded.

TABLE 2

If port information of DMRS is notified for different CWs as in LTE, as described in table 2. For simplicity of analysis, it is assumed in table 2 that there are only 1 DMRS symbols and data is not transmitted on the DMRS symbols.

Table 3 is a DMRS information notification table according to preferred embodiment 3, and as shown in table 3, a higher layer configures 2 CWs.

TABLE 3

As shown in table 3 above, the higher layer configures 2 CWs, and when only 1 CW is actually activated, 0-23, and 24 status indicator values in total are needed to notify the port information of the DMRS, because when the port ratio is smaller, multi-user scheduling needs to be considered, and different scrambling IDs and port numbers are notified. In practice, when 3 CWs are activated, the number of DMRS ports is at least 5, and generally, multi-user scheduling is not required to be considered, and only 0 to 2, 3 status indications are needed to notify port information of DMRS. The method for configuring information of the DMRS ports must meet the requirement of the maximum status indication value of 1 CW activation and 2 CW activations, namely 24, so that 5bits need to be arranged in the DCI to inform the DMRS port information. Overhead in DCI increases compared to LTE. In any case, if the table considers that different DMRS symbols are dynamically notified, whether data is transmitted on DMRS resources, and the like, DCI overhead is larger.

Associating the first information set subset Ai with the second information set subset Bi means that when the information about the DMRS port that the first communication node informs the second communication node belongs to an element in Bi, the information about MCS/RV that the first communication node informs the second communication node must belong to an element in Ai. Since the demodulation reference signal port indicated by the element of Bi belongs to one codeword, the information of MCS/RV etc. corresponding to the second codeword in Ai is practically useless, i.e. only 1 codeword is active. It should be noted that the first information set may be used only for indicating the status of MCS/RV, or may be used for indicating the status of MCS, RV and other information combination, such as MCS, RV, NDI.

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

The first information or the third information refers to information on MCS/RV, and the second or the fourth information refers to information on DMRS ports.

The first information set and the third information set are used for indicating information such as MCS, RV, and NDI, for example, for indicating one or more of MCS, RV, and NDI. Whereas the first set of information is used to indicate the case when only 1 Codeword (CW) is active and the third set of information is used to indicate the case when 2 codewords are all active. The second set of information and the fourth set of information are used to indicate demodulation reference signal (DMRS) port information. Where the second set of information is used to indicate the case when only 1 Codeword (CW) is active and the fourth set of information is used to indicate the case when all 2 codewords are active. The elements in each set can be regarded as a row of elements in the information table, but it is necessary to restrict the case of different codeword activations. So 1 activation can be considered a table.

Different subsets of a contain different MCS/RV etc information. As shown in table 4, subset a1 is similar to LTE. In A1, the MCS/RV status of CW #1 must be a special status, indicating that CW #1 is not active and indicating that A1 is associated with B1, B1 is shown in Table 5. Where B1 is only part of the DMRS port information set. Each element in the table is composed of an index (indicator) and indicated content (MCS/RV for the first information set, DMRS port for the second information set, number of layers, etc.), that is, each element corresponds to a row of an index in the table. Or, after associating the subsets a1 and B1, if the MCS/RV status information indication bit allocated by one user is an element in a1, the DMRS port information status indication bit is an element in B1, the user can know that CW #0 is activated, CW #1 is deactivated, and the MCS/RV information of CW #0 and the DMRS port information allocated to CW #0 in B1 are known. Similar to LTE, in subset a1, the MCS/RV status of CW #1 can only be a special status bit, which indicates that CW #1 is deactivated, and the MCS/RV status of CW #0 contains all possible MCS/RV statuses, and there is no special processing. As shown in table 5, when the state in B1 only protects 1 CW, a part of the DMRS port information state indication bits (i.e., state indication bits 0-15 in table 3) is not included in all, as compared to table 3.

While another subset of a2 is associated with B2, and a2 is different from a 1.

If 2 CWs are independently indicated by information such as MCS/RV like LTE, the MCS/RV status of CW #1 in A2 must be different from A1. At this time, the information such as MCS/RV of the first codeword in a2 and a1 is the same and is not distinguished. And a2 and a1 differ in that a1 and a2 indicate that the elements of the second codeword are different.

A2 can be as shown in Table 6a, the MCS/RV state of CW #1 is another special state, meaning that CW #1 is not active, and this special state is different from the state of CW #1 in A1, meaning that A2 is associated with B2, as shown in Table 7. After associating the subsets a2 and B2, if the MCS/RV status information indication bit allocated by one user is an element in a2, the DMRS port information status indication bit is an element in B2, and the user can know that CW #0 is activated, CW #1 is deactivated, and the MCS/RV information of CW #0 and the DMRS port information allocated to CW #0 in B2 are known. In the subset a2, the MCS/RV status of CW #1 is a special status bit, which indicates that CW #1 is deactivated, and the MCS/RV status of CW #0 includes all possible MCS/RV statuses, and there is no special processing. As shown in table 7, when the status in B2 includes 1 CW, a part of the DMRS port information status indication bits (i.e., status indication bits 16-23 in table 3) is not included in its entirety, as compared to table 3. Assuming that B is divided into 2 subsets, then the elements in B1 and B2 contain all DMRS port indication information, i.e. 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 4bits to indicate, since B1 and B2 are all within 16. Therefore, the elements used to indicate the second codeword information in a1 and a2 are different.

Alternatively, a2 may be as shown in fig. 6b, i.e., in a2, the MCS/RV indicator bit indicating CW #1 is all the other indicator bits except the MCS/RV indicator bit of CW #1 in a 1. As shown in table 8b, there may be any indication other than that the MCS/RV information state of CW #1 in table a1 is different, i.e., 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, i.e., the index value of the DMRS port information contained in B2 cannot be contained in D, i.e., cannot be 0,1, 2. At this point B2 is shown in Table 8, useful indicator bits include bits 8-15. Further, DMRS port information included in B2 is different from DMRS port information indicated by each status bit in B1. Actually, the DMRS port information indicated by values 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 indicator bits of information about MCS/RV, etc., in order to distinguish whether a2 or C is used, i.e., in order to distinguish whether 1 codeword activation or 2 codeword activation is used, the user first needs to judge according to the indicator bits of DMRS port information indicated by the base station, that is, whether the indicator information index about DMRS belongs to B2 or D, and if B2 belongs, the information about corresponding MCS/RV indicates that only 1 CW is activated. At this point the element indices of some subsets of D and B are different, i.e. the indices of D and B2 must be different. While some subsets of A are identical to C, i.e., A2 is identical to C.

Wherein C and D respectively represent information indicating MCS/RV and DMRS port when 2 codewords are activated. For C, if like LTE, i.e. the information indicating MCS/RV of CW #1 cannot indicate that CW #1 is inactive, i.e. all other indicator bits except this special indicator bit, then C may be equal to a2, when C is also shown in table 6B. And D is completely different from the subset of a because D represents port information for 2 CWs, the number of ports is generally always greater than 4 for the initially transmitted data. While the subset of a, since it represents the case of 1 CW activation, the port of DMRS cannot exceed 4 for the initial transmission data.

In this example, only two subsets of a are listed, and in practice a may be divided into a plurality of subsets. The subsets of different a correspond to the subsets of different B. Finally, in the standard, a plurality of subsets of a may be written into a table, and different indices 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, i.e., the information bit indicating MCS/RV at this time belongs to a1, and if the status bit of CW #1 indicated by the base station is 0, i.e., the information bit indicating MCS/RV at this time belongs to a2, it is assumed that a2 is as shown in table 6 a. Similarly, a subset of a plurality of B may be written into a table, as shown in table 3, DMRS port information of 1 codeword and 2 codewords is written into a table.

Table 4 is a subset a1 table according to preferred embodiment 3, as shown in table 4:

TABLE 4

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

TABLE 5

Table 6a is a subset a2 table according to preferred embodiment 3.

TABLE 6a

Table 6b is a table of subsets a2 or C according to preferred embodiment 3.

TABLE 6b

Table 7 is a subset B2 table according to the preferred embodiment.

TABLE 7

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

TABLE 8

The status bit index shown here is actually an indicator value or a value in the table. In actual scheduling, the base station will use several bits to inform different state indexes. For example, a value of DMRS port information is notified with 4 bits. Therefore, based on the above method, if the base station semi-statically configures 2 CWs to one user, the base station will use 2M bits +4bits to respectively notify the information of MCS/RV and DMRS port in DCI. 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, i.e., a1, the port information of the DMRS must correspond to B1.

Assuming that a2 is equal to C, if the MCS/RV corresponding to CW #1 indicated by the base station is not indicator 1, i.e., the set of first information is not a1, 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 certain value of 0,1, 2, it means that CW #1 is in an active state, and the second information set is D. Then D must correspond to C and the first set of information is C. And if the MCS/RV corresponding to CW #1 indicated by the base station is not indicator 1, i.e., the set of first information is not a1, it can be only a2 or C. At this time, the value of the DMRS port information indicated by the base station is not a value of 0,1, or 2, and thus indicates that CW #1 is in an inactive state. The second subset of information is B2. Then B2 must correspond to a2 and the first subset of information is a 2.

Assuming that a2 is not equal to a1 and not equal to C, the MCS/RV status bit indicated by the base station by the user can determine the set type of DMRS port information, whether it is B1, B2 or C.

The following are additional examples of preferred embodiment 3:

preferred embodiment 3 a:

for 2 Codewords (CW), the separate indication of MCS, RV and/or NDI may be inappropriate, such as certain combinations of MCS and RV may not exist, e.g. MCS 15, RV may not equal 2. It is beneficial to jointly encode MCS/RV and/or NDI for 2 codewords, and for some MCS that are not useful, RV, NDI combinations may not be included in the joint information table of MCS, RV, NDI. In the following it is assumed that only MCS, RV joint coding. As shown in table 9, it is assumed that P status bits are combined with the useful MCS and RV when 1 CW is active to indicate MCS and RV information different from CW # 0. When 2 CWs are activated, a plurality of status bits, for example T status bits, are needed to indicate different CWs, different MCSs, and RV information, and at this time, the information indicated by one status bit includes MCS and RV information of 2 CWs.

Table 9 is the joint coding table one of the preferred embodiment 3a, as shown in Table 9, the MCS/RV indication status of

joint coding

1 and 2 CWs

TABLE 9

When one CW is activated, in order to reduce the number of DMRS port information indication status bits, the MCS/RV information table may be added with some status bits. Then, all the state bits of the first set of information are divided into 2 subsets, A1, A2 as shown in Table 10, adding from P to 2P-1 state bits as A2, A2 is actually a repetition of A1, identical in content, except that the indices of the elements are different. Typically, the value of P will be less than or equal to 2^ M. Therefore, it can be seen that the numbers of the elements a1 and a2 are the same, and the contents of the indications are the same, indicating that the indexes are different. That is, the nth element in a1 and the nth element in a2 indicate the same MCS/RV information, and n is a non-negative integer less than P.

A1 is associated with B1, and is used for indicating information of MCS/RV and DMRS port information status bits when one code word is activated; a2 is associated with B2, and information for indicating MCS/RV when one codeword is activated is not identical to DMRS port information status bits, B1 is not identical to B2. C is associated with D. And information for indicating MCS/RV when the 2 code words are activated and DMRS port information status bits.

That is, when the first communication node notifies the second communication node that the element index of the first information belongs to a1, the first communication node notifies the second communication node that the element status bit of the second information belongs to B1; when the first communication node informs the second communication node that the element index of the first information belongs to A2, the first communication node informs the second communication node that the element status bit of the second information should belong to B2; when the first communication node informs the second communication node that the element index of the first information belongs to C, the first communication node informs the second communication node that the element status bit of the second information should belong to D.

Since the value of T is typically the square of P, i.e. much larger than P, adding P values in the first information set element may not cause an increase in overhead.

Of course, the first information set may be divided into more subsets corresponding to more different subsets of the second information set, which may further reduce overhead. This will not be described in detail.

Table 10 is a joint coding table two according to the preferred embodiment 3a, which shows the MCS/RV indication status of

joint coding

1 and 2 CWs as shown in Table 10 and is divided into 3 subsets.

Watch 10

Preferred embodiment 3 b:

with reference to the scheme in the foregoing embodiment, the MCS/RV indication status bits corresponding to one CW are divided into N subsets, and the DMRS port information indication status bits required for one CW are also divided into N subsets, and then association is performed. When the DMRS port information indication status bit is divided, the division may be performed according to the following rule. I.e. the demodulation reference signal port information indicated by the elements of the second subset of information B1 and B2 differ with respect to the characteristics of at least one of

Scrambling sequence, port serial number, port number, whether the data is transmitted simultaneously, DMRS symbol number and time domain code.

Scrambling sequences refer to different scrambling IDs, similar to different n in LTE_SCIDFor example, the scrambling sequence IDs indicated by the elements contained in B1 are all n _SCID0 and the scrambling sequence IDs indicated by the elements contained in B2 are all n _SCID1. Alternatively, only for elements with the DMRS port number equal to or less than L, the scrambling sequence ID indicated by an element contained in B1 and the scrambling sequence ID indicated by an element contained in B2 are different. For example, L is 2, that is, all the scrambling sequence IDs indicated by the status bits indicating the DMRS port number of 2 or less in B1 are 0, and all the scrambling sequence IDs indicated by the status bits indicating the DMRS port number of 2 or less in B2 are 1.

The difference in port numbers means that the DMRS port numbers indicated by the elements contained in B1 are different from the DMRS port numbers indicated by the elements contained in B2. For example, DMRS port numbers indicated by elements included in B1 are all equal to or less than 4, and DMRS port numbers indicated by elements included in B2 are all greater than 4.

The difference in the number of ports means that the number of DMRS ports indicated by an element included in B1 is different from the number of DMRS ports indicated by an element included in B2. For example, the number of DMRS ports indicated by elements contained in B1 is equal to or less than 4, and the number of DMRS ports indicated by elements contained in B2 is greater than 4.

The number of DMRS symbols is different between the number of DMRS symbols indicated by an element included in B1 and the number of DMRS symbols indicated by an element included in B2. For example, the number of DMRS symbols indicated by elements contained in B1 is equal to 1, and the number of DMRS symbols indicated by elements contained in B2 is equal to 2.

The time domain code used for the DMRS port means that the time domain code used for the DMRS port indicated by the element contained in B1 is different from the time domain code used for the port indicated by the element contained in B2. For example, the time domain codes used by the DMRS ports indicated by the elements contained in B1 are all OCC codes [ 11 ], and the time domain codes used by the DMRS ports indicated by the elements contained in B2 are all OCC codes [ 1-1 ].

Whether or not to be simultaneously transmitted with data means that the state of whether or not the DMRS indicated by the elements contained in B1 is simultaneously transmitted with data is different from that of B2. For example, the DMRSs indicated by the elements contained in B1 are not transmitted simultaneously with data, and the DMRSs indicated by the elements contained in B2 are transmitted simultaneously with data.

Preferred embodiment 4

As shown in fig. 4-7, although the DMRS patterns may support multiple DMRS ports, for example, the DMRS patterns in fig. 4, fig. 5, fig. 6, and fig. 7 indicate 6, 12, 4, and 8 DMRS ports, actually, due to traffic bursts, etc., the base station may allocate only a few ports to users during scheduling, or may allocate all ports to users. When allocating ports, the ports may be allocated to one user or may be allocated to a plurality of users. To improve maximum flexibility, the base station needs to indicate to the user whether the resources occupied by some DMRS ports are used for transmitting data.

In order to achieve the most flexible scheduling, when the number of the ports requiring the DMRS is relatively small, the base station only needs to allocate a small number of ports to the user, and resources occupied by the remaining ports can transmit data to the user. When the number of the required DMRS ports is large, the base station must allocate a plurality of ports to the users, and at this time, the resources occupied by the DMRS ports are little or cannot be used for transmitting data to the users. As shown in fig. 4, for example, when the base station schedules that the number of DMRS ports of one user #0 is 1, and the allocated port is p #0, if there is no other user performing multi-user transmission with the user, the base station may send data to the user #0 on the REs occupied by p #2, p #3, p #4, and p #5, and 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 and p #3) and port group #2 (including p #4 and p #5), respectively. However, if the base station allocates DMRS ports p2, p #3, p #4, and p #5 to UE #1, all DMRS ports are not available for data transmission. DMRS information notification is shown in table 11, where the resources occupied by each port or port group need the base station to indicate to the user whether or not to use for transmitting data.

Table 11 is an indication table of whether or not data transmission is included in the DMRS indication information according to preferred embodiment 4.

TABLE 11

In other words, the indication of DMRS port information includes whether the resources occupied by certain DMRS ports are used to transmit data. If the base station indicates the resources occupied by certain ports of the DMRS for transmitting data to the user, the data symbols of the user must contain the symbol in which the DMRS is located.

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

For example, the DMRS has only 1 symbol, as shown in fig. 4. If the starting position of data is the mth symbol in a time slot, the symbol of the DMRS is at the nth symbol, n is 3, and m is greater than n, namely the data is transmitted from the DMRS, at this time, the base station no longer needs to signal whether some DMRS ports are used for data transmission or not. If m < ═ n, that is, data may be transmitted on DMRS symbols, the base station needs to signal 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, and when m < ═ n, the signaling overhead is large. If the notification of m and the indication of DMRS port information are performed separately, the notification of DMRS port information needs to be performed with the largest overhead, that is, whether some DMRS ports are used for data transmission needs to be indicated. The start position of the DMRS and the port information indication of the DMRS may be jointly encoded. As shown in table 12. It can be seen that when m > n, the number of DMRS information indicator bits needed is much smaller, since by default no data is transmitted on the symbols of the DMRS.

Table 12 is a DMRS indication information and data start position joint coding table according to preferred embodiment 4.

TABLE 12

Although this joint signaling can save overhead, the table design is cumbersome and disadvantageous for standard design because the number of indexes of the table is too large. Another joint signaling design method is characterized in that a port information set of the DMRS is determined by a data starting position configured by a higher layer.

In actual configuration, a base station configures a data starting position set by using a high layer, wherein the data starting position set comprises 1 or more real positions of data, namely the base station configures one or more m values by using the high layer, if all the values in the data starting position set configured by the high layer are greater than the positions of symbols of DMRS, a port information set of the DMRS is a set #1 and corresponds to a table indicated by DMRS port information, and the table does not indicate whether resources of certain DMRS port groups are occupied by data or not, namely the DMRS port information indicates that the overhead is relatively low. If some values in the data starting position set configured by the high layer are not larger than the positions of the symbols of the DMRS, the port information set of the DMRS is set #2, and corresponds to a table indicated by the DMRS port information, and some indicating bits in the table need to indicate whether resources of some DMRS port groups are occupied by data or not, namely, the DMRS port information indication cost is relatively large. This is because the location of DMRS is generally fixed and can be configured separately from the starting location of data. Also, data transmission is not adjacent to symbols of the DMRS.

Further, for DMRSs of 2 symbols, for example, DMRSs are fixed on symbols n, n +1, if all values in the data start position set configured by the higher layer are greater than the position n of the symbol of the first DMRS, the port information set of the DMRS is set #1, and corresponds to a table indicated by DMRS port information, where the table does not indicate whether resources of some DMRS port groups are occupied by data, that is, the DMRS port information indication overhead is relatively small. At this time, even if the data start position of the higher layer configuration is n +1, no data is transmitted on the (n + 1) th symbol by default, so that simplicity can be maintained. If some values are not larger than the position n of the symbol of the DMRS in the data starting position set configured by the high layer, the port information set of the DMRS is a set #2, the port information set corresponds to a table indicated by the port information of the DMRS, some indicating bits in the table need to indicate whether the resources of some DMRS port groups are occupied by data or not, namely the DMRS port information indication cost is larger

That is, the DMRS port information indication set is determined by using implicit indication information, which is a data start position configured by higher layer signaling. One set of DMRS port information corresponds to one DMRS information configuration table.

In another indication method for implying DMRS port information, the number of ports of the largest DMRS is associated with the number of supplementary DMRS symbols. The larger the number of supplemental DMRS symbols is, the fewer the maximum number of DMRS ports is.

As shown in fig. 4-7, for

DMRS type

2,1 symbol may support 6 ports and 2 symbols may support a maximum of 12 DMRS ports. This is on the premise of only a preamble dmrs (front loaded dmrs). If the user element moves fast, only the pre-DMRS is configured, and the accuracy of channel estimation is greatly reduced. Therefore, the supplemental demodulation reference signal is configured on the basis of the preamble reference signal. When the reference signal configuration is supplemented, 1 symbol of the pre-reference signal configuration is more appropriate, otherwise, the overhead of the DMRS is too large. And, how many supplementary DMRS symbols are configured depends on how fast the user moves. Fig. 9 is a diagram of DMRS of type 2 and supplementary reference signals according to a preferred embodiment 4 of the present invention. For example, when the user moves the speed bit 120Km/h, a symbol of the supplementary reference signal may be allocated, as shown in the left side of fig. 9. And if the user mobile speed is 500km/h, the base station should configure the user with more than 2 DMRS symbols if shown on the right side of 9. Since 1 DMRS symbol supports 6 ports at most, the number of ports supported by users with different speeds is 6 at this time.

However, for ultra-high speed users, the overhead of configuring 4 DMRS symbols, i.e. configuring 3 supplemental DMRS symbols, is too large, and as shown on the right side of fig. 9, 48 REs in one PRB are used for DMRS. In addition, since the channel condition of the user is generally poor when the user moves at an excessively high speed, the power of each port can be increased by limiting the number of ports of the user, because the total power may be relatively constant. Therefore, when the number of the supplementary reference signal symbols is large, the maximum port number of the DMRS may be limited, for example, to 2 or 4, fig. 10 is a schematic diagram of limiting the maximum port number of the DMRS according to the preferred embodiment 4 of the present invention, as shown in fig. 10, wherein the remaining resources on the DMRS symbols are used for data transmission by default, so as to improve transmission efficiency.

Therefore, for the DMRS of type 2, it can be seen that when there is no supplementary reference signal, the preamble reference signal can configure 2 symbols at most, and 12 ports are supported at maximum. When only one supplementary reference signal is configured, the pre-reference signal is configured with only 1 symbol, and since the supplementary DMRS is the repetition of the pre-reference signal and one pre-reference signal symbol supports 6 DMRS ports at maximum, the system supports 6 DMRS ports at maximum when only one supplementary reference signal is configured. When more than 2 supplementary reference signals are configured, for example, 3 supplementary reference signal symbols, the maximum

DMRS port bits

2 or 4 may be limited to be supported in order to save overhead.

In summary, the number of ports of the largest supported DMRS is associated with the number of supplemental DMRS symbols. The larger the number of supplemental DMRS symbols is, the fewer the maximum number of DMRS ports is. The number of the DMRS ports is the number of the DMRS ports supported by the system. For example, the actual system supports the largest DMRS port number of bits 4, but the base station may actually schedule 1 DMRS port to the user.

So it can be said that, in general, the number of DMRS ports supported can be limited by a predefined limit, if the number of supplemental reference signal symbols is larger, the number of supported DMRS ports is smaller.

In addition, in order to reduce the physical layer dynamic signaling overhead without deactivating, another joint signaling configuration method is characterized in that,

and jointly informing N demodulation reference signal configuration parameters of K groups. Wherein K is an integer greater than or equal to 1. N is an integer of 2 or more, and N parameters are included in the following parameters:

scrambling sequence, port number, demodulation reference signal and data multiplexing state, demodulation reference signal symbol number, time domain OCC code, and pattern of supplementary reference signal.

Further, the parameters of the joint notification are configured by higher layer signaling.

Further, the parameters of the joint notification are different, and the corresponding DMRS port configuration information sets are different.

Further, the physical layer overhead occupied by different DMRS port configuration information sets is the same.

Further, each group corresponds to a quasi co-site parameter set.

According to the foregoing, the parameters related to DMRS port configuration are numerous, and may include scrambling sequences, the number of ports, demodulation reference signal and data multiplexing states, the number of demodulation reference signal symbols, time domain OCC codes, and patterns of supplemental reference signals. The pattern of the supplementary reference signal mainly refers to the number of the supplementary reference signal time domain symbols. The demodulation reference signal and data multiplexing state refers to whether the DMRS are multiplexed with data or not, and if the DMRS are multiplexed, the resources occupied by the DMRS port groups can be used for data transmission. This state can be implemented with a zero power reference signal or can be directly configured. For example, the base station is represented by the DMRS with zero power in the pattern shown in fig. 4, the DMRSs with zero power are transmitted on the ports p4 and p5, REs occupied by the ports p4 and p5 may be used for transmitting data, and other reference signal positions not represented by the DMRSs with zero power cannot be used for transmitting data. 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 supported DMRS ports. Different time domain OCC codes generally mean that a higher layer can be configured to have only 11 or to include 11 and 1-1.

The higher layer signaling, generally referred to as RRC signaling, does not exclude RRC signaling in combination with MAC signaling. The base station configures the configuration parameters for the user association using higher layer signaling. As described in tables 13a and b below, the base station jointly configures parameters of 5 DMRSs using higher layer signaling. Different joint parameters configured by the higher layer signaling correspond to different DMRS port information sets. In this case, K is 1, i.e., only 1 group.

Table 13a first configuration: jointly informing multiple DMRS parameters of 1 group

Table 13b second configuration: jointly informing multiple DMRS parameters of 1 group

Based on different joint parameters configured by a higher layer, a DMRS port information set corresponding to table 13a, that is, in DMRS information parameter table 13a, a scrambling sequence must be 0, the maximum number of DMRS ports must be less than or equal to 4, the number of symbols of a demodulation reference signal is 1, and the time domain OCC can only be [ 11 ]. So in the table of the corresponding DMRS port information parameter set, the information indicated by all elements must conform to the parameter configuration, for example, as shown in table 14 a. Since the value of each DMRS configuration parameter is limited by the joint parameter configured by the higher layer, the number of significant elements in the DMRS port configuration information set is much smaller, and only less than 16 elements are included in table 14a, so that 4bits is sufficient in the DCI. Meanwhile, in order to reduce the user blind detection complexity, the DCI size should be constant. Thus, the overhead of different DMRS port information sets corresponding to joint parameters configured for different higher layers needs to be kept the same. As shown in fig. 14b, even though the number of actual intentional elements contained is small, and is less than 8, the DMRS port set is represented by 4bits, i.e., 16 elements, in order to unify DCI overhead.

Therefore, in order to notify the port information of the DMRS, it is ensured that the physical layer overhead occupied by the notification of the DMRS port information is the same after the number of elements in different DMRS port configuration information sets is the same. The element here contains a row in the table where only index has no content. For more powerful joint notification, at least three or four of the above-described configuration information parameters regarding the demodulation parameters may be jointly notified.

Table 14a DMRS port configuration information set 1

Table 14b DMRS port configuration information set 2

When K >1, N demodulation reference signal configuration parameters of a plurality of groups are jointly configured. Wherein K is an integer greater than or equal to 1. N is an integer of 2 or more, and N parameters are included in the following parameters: scrambling sequence, port number, demodulation reference signal and data multiplexing state, demodulation reference signal symbol number, time domain OCC code, and pattern of supplementary reference signal. The parameters of the joint notification are configured by higher layer signaling. Wherein each group corresponds to a set of quasi co-site parameters. It should be noted that the QCL parameters for each group may be configured the same or differently.

Since the DMRS ports are divided into a plurality of port groups in NR at the time of multi-TRP transmission, each port group corresponds to one QCL parameter configuration set. Different sets of parameters may correspond to different TRPs. Therefore, the configuration parameters of DMRS may preferably be different for different TRPs. For example, K is 2, i.e. it is possible to transmit data to one user on behalf of 2 TRPs, so the base station will include 2 QCL parameter sets when configuring QCL parameters in the higher layer signaling, each set including reference signals required for quasi co-site. As shown in table 15, the base station jointly configures 3 DMRS parameters for 2 groups using higher layer signaling. The values of the parameters may be different for the 2 groups. The corresponding DMRS configuration set table is shown in table 15 b. Where, when the total number of layers is 1, then there are actually only 1 port group by default, since 1 port cannot be split into 2 groups.

Table 15a first configuration: jointly informing multiple DMRS parameters of 2 groups

Table 15b corresponds to DMRS configuration set of table 15a

And the base station jointly informs the parameters of the K groups, and if the N parameter values of the K groups are different, different DMRS port configuration information sets are caused. Also, the physical layer overhead occupied by different DMRS port configuration information sets should be the same.

Preferred embodiment 5:

according to the above preferred embodiment 3, each Codeword (CW) in LTE has a corresponding MCS, RV, and NDI indication field, and there are 2 codewords corresponding to 2 Transport Blocks (TBs) for transmitting data. For each transport block, the base station configures 1 MCS/RV/NDI (modulation coding scheme/redundancy version/new data indicator) indication field (5+1+2 ═ 8bits) for each CW in the DCI, as shown in 36.212, the MCS needs 5bits, the NDI needs 1bit, and the RV needs 2 bits. Although the MCS/RV/NDI fields corresponding to 2 CWs always exist, the base station may schedule only 1 CW at some time while deactivating the other one. After receiving 1 or 2 TBs sent by the base station, the user performs data demodulation, and then feeds back an A/N for each TB block to indicate whether the corresponding TB demodulation is correct or not. If the demodulation is correct, the user feeds back A, otherwise, feeds back N. When only 1 TB is transmitted, that is, only 1bit needs to be fed back, for example, 0 indicates demodulation error, and 1 indicates demodulation correctness. And when the base station sends 2 TBs to the user, the user needs to feed back 2bits A/N.

When the number of DMRS ports transmitted to a user by a base station is large, that is, the number of transmitted data layers is large or the resources allocated to the user are large, each TB includes a large amount of data transmission because there are only 2 TBs. When channel coding is performed like LTE, one tb (transmission block) is too large and is divided into a plurality of cbs (code blocks). If one a/N is fed back for each TB, again as per LTE, the entire TB needs to be retransmitted as long as one CB in the TB is transmitted in error, even if the other CBs are transmitted correctly. This is disadvantageous in improving transmission efficiency. However, if one TB is divided into many CBs and one a/N is fed back for each CB, the feedback overhead is too much. In order to compromise the overhead of feedback and transmission efficiency, one or more CBs may be grouped into a CB group, that is, a CBG (code block group), each CBG feeds back an a/N, and the base station sets an NDI field for each CBG individually during scheduling. Wherein the NDI is used to indicate whether the corresponding CBG is new data or old data for one transmission.

First, the base station configures the number X1 of the total code block groups, or the total a/N feedback bit number X2, or the total new data indication bit number X3 through high-layer signaling. The total number is the sum of the numbers corresponding to all the codewords. X is the general name of X1, X2 and X3, namely X can represent X1, X2 or X3.

Since the number of code words is dynamically changed, in order to ensure that X is constant, the value of X corresponding to each code word should be dynamically changed, i.e. related to X and the number of code words scheduled at a certain time. If the number of code words scheduled by the base station to the user is 1 for the time slot #0, the number of code block groups of the code word is X1, the number of a/N bits fed back by the user for the code word is X2, and the number of bits used by the base station for indicating new data to the user is X2. If the number of code words scheduled by the base station to the user is 2 for slot #1, the sum of the number of code block groups of the 2 code words is X1, the sum of the a/N bit numbers fed back by the user for the 2 code words is X2, and the sum of the bit numbers used by the base station for indicating the new data indication of the 2 code words to the user is X2. Therefore, for different numbers of code words, the number of code block groups, the number of a/N bits, and the number of NDI bits corresponding to each code word are different. That is, the number of code block groups corresponding to one codeword, the number of a/N feedback bits corresponding to one codeword, or the number of new data indicator bits corresponding to one codeword may depend on the number N of transmitted codewords.

Since different code words experience different channel conditions, the resources ultimately allocated by the base station to multiple code words for a user are also different. For example, the TB sizes allocated to 2 CWs of one user by the base station may be different, the MCS may be different, and the number of layers may be different. This is because the CQIs fed back to the base station for these 2 codewords by the user are different. Therefore, the number X1_ k of CBGs in different codeword configurations, or the number X2_ k of a/N feedback bits, or the number X3_ k of new data indication bits may be different, where the index k represents the codeword sequence number, for example, there are 2 CWs in total, and then k is 0, 1; and if there are 3 CWs, k may be equal to 0,1, 2.

So considering the channel conditions of different codewords, such as the size of the allocated TB of codeword 0 is larger than codeword 1, the number of CBGs can be allocated to codeword 0 higher layer configured or predefined multiple, i.e., X1_0> X1_1, or X2_0> X2_1, or X3_0> X3_ 1. A similar rule is as follows. The parameter is X1_ k, or X2_ k, or X3_ k.

Rule 1: the parameters of the code words with more layers are large, and the parameters of the code words with less layers are small;

rule 2: the code word parameter with the large TB is large, and the code word parameter with the small TB is small;

rule 3: the code word parameter with the large MCS is large, and the code word parameter with the small MCS is small;

rule 4: the code word parameter with large CQI fed back is large, and the code word parameter with large CQI is large;

in general, the base station will use DCI to dynamically inform each CBG whether it is new data, i.e. to inform one NDI for each CBG. In order to ensure that the DCI payload size is constant.

This method is particularly suitable when X is not an integer multiple of the number N of codewords, i.e. X divided by N is not an integer. For example, X1 for a higher layer configuration is equal to 5, and the number of codewords allocated to a user by the base station is 2, at which time 2.5 CBGs per codeword are not possible. Therefore, at this time, it can be determined according to the above centralized rule which codeword has the larger number of CBGs and which codeword has the smaller number of CBGs. For rule 4, when performing channel condition feedback, a general user may feed back different CQIs for different codewords. The base station can judge which code word is larger or smaller than X1/X2/X3 according to the CQI.

One way is for one of the parameters to be equal to X divided by N and rounded up for codewords with large parameters or to be equal to X divided by N and rounded down for codewords with small parameters. For example, for the number of CBGs of a codeword, if codeword 0 contains more CBGs, X1_0 is equal to X divided by N rounded up. For example, X1 is 5, N is 2, X1 divided by N is 2.5, and rounding up to the last digit 3, i.e., rounding up is to an integer that is greater than and closest to a decimal. X1 — 1 is then equal to 5-3-2. Since the sum of the number of CBGs for each codeword must be equal to 5.

Optionally, for a codeword, the parameter is equal to the number of layers included in the codeword multiplied by X divided by the total number of layers of all codewords, and then rounded. For example, if X is 5, codeword 0 contains 3 layers and codeword 1 contains 2 layers, X1_0 is equal to the number of layers contained in codeword 0, multiplied by X, and divided by the total number of layers, 5, to obtain X1_0 equal to 3. For example, if X is 5, codeword 0 contains 1 layer and codeword 1 contains 2 layers, X1_0 is equal to the number of layers 1 contained in codeword 0 multiplied by 5 and divided by the total number of layers 3, i.e., X1_0 is equal to five thirds, and the remainder is 2 or 1. Rounding here can be predefined as rounding up or rounding down.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

Example two

In this embodiment, a configuration apparatus of reference signal information is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and the description already made is omitted for brevity. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

According to another embodiment of the present invention, there is provided an apparatus for notifying reference signal information, which is applied to a first communication node, the apparatus including:

an obtaining module, configured to 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, and associate the first information set subset Ai and the second information set subset Bi, where 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 element in the first information set A is used for indicating at least one of the following: modulation and demodulation scheme MCS and redundancy version RV information; elements in the second information set B are used to indicate demodulation reference signal port configuration information, where demodulation reference signal ports indicated by elements of the subset Bi belong to one codeword;

a first sending module, configured to send the first information set a and the second information set B to a second communication node.

It should be added that, in the method embodiment of the first embodiment, the method steps executed by the first communication node may be executed by the configuration apparatus of the reference signal information.

According to another embodiment of the present invention, there is provided a DMR port information configuring apparatus, applied to a first communication node, including:

the device comprises a setting module, a receiving module and a processing module, wherein the setting module is used for presetting one or more demodulation reference signal port groups;

a second sending module, configured to instruct, through a signaling, the second communication node to: whether the resources occupied by the preset demodulation reference signal port group are used for sending data or not;

the first communication node and the second communication node agree that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether data is sent on the non-preset demodulation reference signal port group resources or not; the number of the non-preset port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time-frequency resource.

It should be added that, in the method embodiment of the first embodiment, the method steps executed by the first communication node may be executed by the configuration apparatus of DMR port information.

According to another embodiment of the preferred embodiments of the present invention, there is provided a DMR port information configuring apparatus, applied to a first communication node, including:

a third sending module, configured 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 port number of the DMRS and the number of the supplementary DMRS symbols.

According to another embodiment of the present invention, there is also provided a configuration apparatus for control signaling, applied to a first communication node, the apparatus including:

a determining module, configured to determine at least one of the following parameters according to the number N of codewords 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.

It should be added that, in the method embodiment of the first embodiment, the method steps executed by the first communication node may be executed by the configuration apparatus for controlling signaling.

According to another embodiment of the present invention, there is also provided an apparatus for notifying reference signal information, which is applied to a second communication node, the apparatus including:

a first receiving module, configured to receive a first information set a and a second information set B sent by a first communication node,

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 element in the first information set A is used for indicating at least one of the following: modulation and demodulation scheme MCS, RV information; the elements in the second information set B are used to indicate demodulation reference signal port configuration information, where the demodulation reference signal ports indicated by the elements of the subset Bi belong to one codeword.

It should be added that, in the method embodiment of the first embodiment, the method steps executed by the second communication node may be executed by the configuration apparatus of the reference signal information.

According to another embodiment of the present invention, there is also provided a DMR port information configuring apparatus, applied to a second communication node, including:

a second receiving module, configured to receive the following information sent by the first communication node: whether the resource occupied by a demodulation reference signal port group preset by the first communication node is used for sending data or not;

It should be added that, in the method embodiment of the first embodiment, the method steps executed by the second communication node may be executed by the DMR port information configuring device.

a third receiving module, configured to receive 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 the starting position of data transmission; the maximum port number of the DMRS and the number of the supplementary DMRS symbols.

It should be added that, in the method embodiment of the first embodiment, the method steps executed by the second communication node may be executed by the configuration of the DMR port information.

It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

EXAMPLE III

According to another embodiment of the present invention, there is also provided a processor for executing a program, wherein the program executes to perform the method according to any one of the above-mentioned alternative embodiments.

Example four

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Finally, a Chinese-English reference table of technical terms described in the present document is given as follows:

Claims

1. a method for configuring demodulation reference signal port information is characterized by comprising the following steps:

presetting one or more demodulation reference signal port groups;

and the following information is indicated to a second communication node of the opposite terminal through signaling: whether the resources occupied by the preset demodulation reference signal port group are used for sending data or not;

the communication parties agree that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether the data is sent on the non-preset demodulation reference signal port group resources; the number of the non-preset demodulation reference signal port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time-frequency resource.

2. The method of claim 1, wherein the power of all demodulation reference signal ports is limited to a constant value.

3. The method of claim 1, wherein different demodulation reference signal port groups are preset by different second communication nodes or cells.

4. The method of claim 1, wherein the non-default demodulation reference signal port set is configured by configuring a reference signal with zero power.

5. A method for configuring demodulation reference signal port information is characterized by comprising the following steps:

sending a joint notification;

the joint notification includes the maximum port number of the demodulation reference signal and the number of the supplemental demodulation reference signal symbols, and the greater the number of the supplemental demodulation reference signal symbols is, the less the maximum port number of the demodulation reference signal is.

6. The method of claim 5, wherein the set of demodulation reference signal port information is determined by a starting position of data configured by a higher layer.

7. A method for configuring control signaling, characterized in that,

determining 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;

for one parameter, the sum of the parameters corresponding to all the code words is X, and the X is predefined or configured by high-layer signaling, wherein the predefined rule is at least one of the following rules:

rule 1: the more the number of layers included in the codeword, the larger the parameter of the codeword;

rule 2: the larger the transport block, TB, of the codeword, the larger the parameter of the codeword;

rule 3: the larger the modulation and demodulation mode of the code word is, the larger the parameter of the code word is;

rule 4: the larger the feedback channel quality indication, CQI, of the codeword, the larger the parameter of the codeword.

8. The method of claim 7, wherein a quotient of said X and said N is not an integer for one of said parameters.

9. Method according to claim 8, characterized in that for one of said parameters, in case there are at least two codewords, said parameter is equal to X divided by N and rounded up for codewords with large parameters and/or equal to X divided by N and rounded down for codewords with small parameters.

10. A method as claimed in claim 7 or 8, characterised in that for a code word, the parameter is equal to the number of layers that the code word contains multiplied by X divided by the total number of layers of all code words and then rounded.

11. An apparatus for configuring demodulation reference signal port information, applied to a first communication node, includes:

a second sending module, configured to instruct, through a signaling, a second communication node to: whether the resources occupied by the preset demodulation reference signal port group are used for sending data or not;

the first communication node and the second communication node agree that resources occupied by a non-preset demodulation reference signal port group cannot be used for sending data, and signaling is not needed for indicating whether data is sent on the non-preset demodulation reference signal port group resources or not; the number of the non-preset demodulation reference signal port groups is at least 2, and demodulation reference signal ports in the same port group occupy the same time-frequency resource.

12. An apparatus for configuring demodulation reference signal port information, applied to a first communication node, includes:

a third sending module, configured to send a joint notification to the second communication node; wherein, the joint notification includes: the number of the maximum ports of the demodulation reference signals is larger than the number of the supplementary demodulation reference signal symbols, and the number of the maximum ports of the demodulation reference signals is smaller.

13. A configuration device of control signaling, applied to a first communication node, characterized in that:

a determining module, configured to determine at least one of the following parameters according to the number N of codewords 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;

14. A computer-readable storage medium, in which a computer program is stored, wherein the program is operative to perform the method of any of claims 1 to 10.

15. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to perform the method of any of the preceding claims 1 to 10 when running.