CN111769918B

CN111769918B - DMRS port indication method and device

Info

Publication number: CN111769918B
Application number: CN201910254199.3A
Authority: CN
Inventors: 纪刘榴; 任翔; 王潇涵; 杭海存; 施弘哲; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-30
Filing date: 2019-03-30
Publication date: 2022-05-24
Anticipated expiration: 2039-03-30
Also published as: WO2020200114A1; CN111769918A

Abstract

The application provides a method and a device for indicating DMRS ports, relates to the technical field of communication, and is used for effectively enabling a terminal to acquire the DMRS ports adopted by a plurality of TRPs (transient state indicators) and reducing the transmission overhead of signaling. The method comprises the following steps: the terminal receives first indication information and second indication information sent by network equipment; the first indication information is used for indicating N TCI states, the second indication information is used for indicating at least one group of DMRS configuration information, and the DMRS configuration information comprises port numbers of M DMRS ports; and determining a set of DMRS configuration information from at least one set of DMRS configuration information indicated by the second indication information according to the number of TCI states indicated by the first indication information.

Description

DMRS port indication method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for indicating a demodulation reference signal (DMRS) port.

Background

In order to obtain higher spectrum utilization rate, a communication system generally adopts a mode of same-frequency networking. That is, multiple cells in the network may be deployed in the same frequency band. Thus, when a user is at the edge of a serving cell, the user may suffer from co-channel interference of neighboring cells of the serving cell, which severely limits the quality of service and throughput of the edge user. Therefore, in order to solve the problem of interference between cells, a Coordinated Multi-Point (CoMP) transmission technique is widely used. The assisted multipoint transmission technology specifically means that multiple transmission points (TRPs) participate in cooperation to transmit data for one terminal, or multiple TRPs jointly receive data sent by one terminal.

Under the scenario that a plurality of TRPs cooperatively participate in data transmission for one terminal, the terminal needs to know the DMRS port used by each TRP, so as to demodulate data sent by the plurality of TRPs. Because there are many schemes for DMRS ports used by multiple TRPs, if the current DMRS port indication manner is used, bits of DMRS port indication information need to be added, which results in a large signaling transmission overhead.

Disclosure of Invention

The application provides an indication method and an indication device of a DMRS port, which are used for effectively indicating the DMRS ports adopted by a plurality of TRPs and reducing the transmission overhead of signaling.

In a first aspect, a method for indicating a DMRS port is provided, including: the terminal receives the first indication information and the second indication information; wherein, the first indication information is used for indicating N Transmission Configuration Indication (TCI) states; the second indication information is used for indicating at least one group of DMRS configuration information, the group of DMRS configuration information comprises port numbers of the M DMRS ports, and M, N are positive integers; and the terminal determines a corresponding group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information according to the number of TCI states indicated by the first indication information. Based on the technical scheme, for the number of different TCI states, the second indication information corresponds to different DMRS configuration information. That is, the DMRS configuration information is jointly indicated by the number of TCI states and the second indication information, and the second indication information may indicate more DMRS configuration information in the same bit. Thus, the DMRS ports used by a plurality of TRPs can be effectively indicated without increasing bits of the second indication information (i.e., DMRS port indication information), which is beneficial to reducing signaling transmission overhead.

In a second aspect, a method for indicating a DMRS port is provided, including: the network equipment generates first indication information and second indication information, wherein the first indication information is used for indicating N TCI states; the second indication information is used for indicating at least one group of DMRS configuration information, and the DMRS configuration information comprises port numbers of the M DMRS ports; the number of TCI states indicated by the first indication information is used for determining a set of DMRS configuration information from at least one set of DMRS configuration information indicated by the second indication information; n, M are all positive integers; and then, the network equipment sends the first indication information and the second indication information to the terminal.

With reference to the first aspect and the second aspect, in one possible design, the number of TCI states indicated by the first indication information is used to determine a first preset correspondence, where the first preset correspondence is a correspondence between DMRS configuration information and the second indication information.

With reference to the first aspect and the second aspect, in one possible design, the second indication information is used to determine a second preset corresponding relationship, where the second preset corresponding relationship is a corresponding relationship between DMRS configuration information and the number of TCI states.

With reference to the first aspect and the second aspect, in one possible design, of at least one set of DMRS configuration information indicated by the second indication information, DMRS ports indicated by a set of DMRS configuration information corresponding to a TCI state number greater than 1 belong to different Code Division Multiplexing (CDM) groups. In this way, in a scenario where a plurality of TRPs transmit data to a terminal by a coherent transmission technique, mutual interference between DMRS ports employed by the plurality of TRPs can be avoided.

With reference to the first aspect and the second aspect, in one possible design, the N TCI states indicated by the first indication information include a first TCI state and a second TCI state; the first TCI state corresponds to M first DMRS ports; wherein the M first DMRS ports are configured by the corresponding set of DMRS configuration information; the second TCI state corresponds to M second DMRS ports; wherein the M second DMRS ports are configured based on correspondence between the M second DMRS ports and the M first DMRS ports. In this way, in a scenario where a plurality of TRPs transmit data to the terminal in a space division multiplexing manner, since a set of DMRS configuration information indicates only a DMRS port corresponding to one TRP, the design of DMRS configuration information may be simplified.

With reference to the first aspect and the second aspect, in one possible design, in at least one set of DMRS configuration information indicated by the second indication information, where the set of DMRS configuration information includes a number of K sets of DMRS ports, the number of K sets of DMRS ports corresponds to the number of K sets of DMRS ports, the number of K sets of DMRS ports is one-to-one corresponding to the K sets of TCI states, the number of K sets of DMRS ports is the same, and K is a positive integer.

With reference to the first aspect and the second aspect, in one possible design, the set of DMRS configuration information further includes: the number of CDM groups not used for mapping data, and/or the number of preamble symbols.

In a third aspect, a terminal is provided, including: a processing module and a communication module. The communication module is used for receiving first indication information and second indication information; the first indication information is used for indicating N TCI states; the second indication information is used for indicating at least one group of DMRS configuration information, the group of DMRS configuration information comprises port numbers of the M DMRS ports, and M, N are positive integers. And the processing module is used for determining a group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information according to the number of TCI states indicated by the first indication information.

In one possible design, the number of TCI states indicated by the first indication information is used to determine a first preset correspondence, where the first preset correspondence is a correspondence between DMRS configuration information and the second indication information.

In one possible design, the second indication information is used to determine a second preset correspondence, where the second preset correspondence is a correspondence between DMRS configuration information and the number of TCI states.

In one possible design, DMRS ports indicated by a group of DMRS configuration information corresponding to a set of DMRS configuration information with a TCI state number greater than 1 in at least one group of DMRS configuration information indicated by the second indication information belong to different CDM groups.

In one possible design, the N TCI states indicated by the first indication information include a first TCI state and a second TCI state; the first TCI state corresponds to M first DMRS ports; wherein the M first DMRS ports are configured by the corresponding set of DMRS configuration information; the second TCI state corresponds to M second DMRS ports; wherein the M second DMRS ports are configured based on correspondence between the M second DMRS ports and the M first DMRS ports.

In one possible design, in the at least one set of DMRS configuration information indicated by the second indication information, the set of DMRS configuration information corresponding to K TCI states includes port numbers of K sets of DMRS ports, the port numbers of the K sets of DMRS ports are in one-to-one correspondence with the K TCI states, the port numbers of the K sets of DMRS ports are the same, and K is a positive integer.

In one possible design, the set of DMRS configuration information further includes: the number of CDM groups not used for mapping data, and/or the number of preamble symbols.

In a fourth aspect, a terminal is provided, which includes: a processor, coupled to the memory, for reading the instructions in the memory and implementing the method for indicating the DMRS port according to the instructions.

In a fifth aspect, a computer-readable storage medium is provided, which stores instructions that, when executed on a terminal, enable the terminal to perform the method for indicating the DMRS port according to the first aspect or the third aspect.

A sixth aspect provides a computer program product containing instructions which, when run on a communication device, enables a terminal to perform the method of indicating a DMRS port of the first or third aspect.

In a seventh aspect, a chip is provided, where the chip includes a processing module and a communication interface, the communication interface is configured to transmit a received code instruction to the processing module, and the processing module is configured to run the code instruction to support a terminal to perform the method for indicating the DMRS port according to the first aspect. The code instructions may come from memory internal to the chip or from memory external to the chip. Alternatively, the processing module may be a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiver pin on a chip.

In an eighth aspect, a network device is provided, comprising: a processing module and a communication module. The processing module is used for generating first indication information and second indication information, wherein the first indication information is used for indicating N TCI states; the second indication information is used for indicating at least one group of DMRS configuration information, and the DMRS configuration information comprises port numbers of the M DMRS ports; the number of the TCI states indicated by the first indication information is used for determining a corresponding group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information; n, M are all positive integers; and the communication module is used for sending the first indication information and the second indication information to the terminal.

In one possible design, in the at least one set of DMRS configuration information indicated by the second indication information, DMRS ports indicated by a set of DMRS configuration information corresponding to a number of TCI states greater than 1 belong to different CDM groups.

In one possible design, the set of DMRS configuration information further includes: the number of CDM groups and/or the number of preamble symbols that are not used for mapping data.

In a ninth aspect, there is provided a network device comprising: a processor, configured to be coupled to the memory, read instructions in the memory, and implement the method for indicating the DMRS port according to the instructions.

A tenth aspect provides a computer-readable storage medium, having stored therein instructions, which, when run on a network device, enable the network device to perform the method for indicating a DMRS port according to the second aspect.

In an eleventh aspect, there is provided a computer program product containing instructions that, when run on a communication apparatus, enable a network device to perform the method for indicating a DMRS port of the second aspect.

In a twelfth aspect, a chip is provided, where the chip includes a processing module and a communication interface, the communication interface is configured to transmit the received code instructions to the processing module, and the processing module is configured to execute the code instructions to support a network device to perform the method for indicating the DMRS port according to the second aspect. The code instructions may come from memory internal to the chip or from memory external to the chip. Alternatively, the processing module may be a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiver pin on a chip.

In a thirteenth aspect, a communication system is provided, which includes a network device and a terminal. The terminal is configured to perform the method of the first aspect, and the network device is configured to perform the method of the second aspect.

The technical effects brought by any one of the design manners of the third aspect to the thirteenth aspect may refer to the beneficial effects in the corresponding methods provided above and the technical effects brought by the design manners, and are not described herein again.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic architecture diagram of another communication system according to an embodiment of the present application;

fig. 3 is a schematic hardware structure diagram of a terminal and a network device according to an embodiment of the present disclosure;

fig. 4 is a flowchart of an indication method for a DMRS port according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

In order to facilitate understanding of the technical solutions of the present application, the following briefly introduces terms related to the present application.

1. Antenna port

An antenna port is understood to be a transmitting antenna that can be recognized by a receiving end device, or a transmitting antenna that can be spatially differentiated. An antenna port may be defined in terms of a reference signal (or pilot signal) associated with the antenna port. One antenna port may be one physical antenna on the transmitting end device, or may be a weighted combination of multiple physical antennas on the transmitting end device. In the embodiments of the present application, one antenna port corresponds to one reference signal without specific description.

The antenna port is used for carrying at least one of specific physical channels and physical signals. Taking DMRS ports as an example, the DMRS ports are antenna ports carrying DMRSs. Signals transmitted through the same antenna port, whether transmitted through the same or different physical antennas, may be considered the same or correlated for the channels corresponding to the paths traveled by the signals in space. That is, the receiving end may consider the same or correlated channels of the signals transmitted through the same antenna port when demodulating the signals. That is, the antenna ports define channels on a certain symbol. If the antenna ports of two symbols are the same, the channel on one symbol can be inferred by the channel on the other symbol.

In the embodiment of the application, the antenna port is uniquely identified by the port number. The port number may also have other names, such as a port index, a port identifier, and the like, and the embodiments of the present application are not limited thereto. In the case where the antenna ports are uniquely identified by the port numbers, the port numbers can also uniquely identify the ports through a change in function. For example, the port number used by the terminal is indicated as an input to the function, and the identity of this antenna port is actually used as an output of the function. The function has a one-to-one mapping relationship of input and output. For example, the function is a constant plus an input as an output. The identification of actually using this antenna port may be an identification of the signal generating this antenna port. For example, an identification of the sequence of antenna ports is generated, which may include an identification of a pseudo-random function initialization factor of the generated sequence.

For convenience of description, DMRS port # X denotes a DMRS port having a port number X. A set of DMRS ports may be denoted as x1, x2, … …, xn. For example, {1,2} indicates that the set of DMRS ports are DMRS port #1 and DMRS port # 2.

2、DMRS

The DMRS is used to demodulate a Physical Downlink Shared Channel (PDSCH). The DMRS is carried on a partial Orthogonal Frequency Division Multiplexing (OFDM) symbol in the PDSCH (or time cell). In addition, the network device configures the PDSCH (or time cell) to carry a forward-located (Front-load) DMRS on an OFDM symbol located in Front, so that the terminal can perform operations such as user detection and channel estimation as soon as possible, thereby reducing the delay of demodulation.

In the embodiment of the present application, the OFDM symbol carrying the front-load DMRS may be referred to as a preamble symbol (front-load symbols) for short. The number of the preamble symbols may be 1 or 2, and the embodiment of the present application is not limited thereto.

DMRS types (types) may be classified into type1 and type 2. The DMRS type has a correspondence relationship with a resource pattern, and the resource pattern is used to indicate a location of a Resource Element (RE) carrying the DMRS. It should be noted that the DMRS type may be configured by a higher layer parameter DL-DMRS-config-type.

Currently, in the 3GPP R15 protocol, the indication information of the DMRS port may be an antenna port field (antenna port field) in the DCI. The communication system is configured with a DMRS port indication table in advance, and the DMRS port indication table is used for storing multiple groups of DMRS configuration information. The value of the antenna port field is an index value of the DMRS configuration information in the DMRS port indication table, that is, each value of the antenna port field corresponds to a group of DMRS configuration information.

The set of DMRS configuration information may include one or more configuration information, for example, the set of DMRS configuration information may include a port number of a DMRS port, the number of DMRS CDM groups not used for mapping data, and/or the number of preamble symbols.

For example, the DMRS port indication table may refer to table 1 below. In table 1, the DMRS type is type2, and the maximum length of symbols occupied by the DMRS is 1. Table 1 shows a correspondence between a value (i.e., an index value) of an antipna port field and a set of DMRS configuration information. In table 1, a set of DMRS configuration information corresponds to a row identified by one index value.

Exemplarily, as described with reference to table 1, when codeword 0 is enabled and codeword 1 is not enabled, if the value of the antipna port field is 0, the DMRS configuration information indicates that the port number of the DMRS port is 0, the number of DMRS and CDM groups to which data is not mapped is 1, and the number of preamble symbols is 1.

TABLE 1

3. CDM group

The CDM group comprises a plurality of antenna ports, the antenna ports in the same CDM group multiplex the same time-frequency resource, and the antenna ports in the same CDM group are distinguished by code division, that is, the code domain resources of the sequences of the antenna ports in the same CDM are different. The Code domain resources are typically Orthogonal codes, such as Orthogonal Cover Codes (OCC). The OCC code may be used in the time domain, frequency domain, spatial domain (beam domain), etc.

In the embodiments of the present application, the CDM group specifically refers to the DMRS CDM group, i.e., the CDM group includes a plurality of DMRS ports. The CDM group may be configured by higher layer signaling, and specific contents thereof are referred to in the prior art and will not be described herein.

The CDM group is described below by way of example.

For 1-symbol DMRS type1, CDM group 1 contains DMRS ports {0,1}, and CDM group 2 contains DMRS ports {2,3 };

for 2-symbol DMRS type1, CDM group 1 contains {0,1,4,5} DMRS ports, and CDM group 2 contains {2,3,6,7 };

for 1-symbol DMRS type2, a DMRS port included in CDM group 1 is {0,1}, a DMRS port included in CDM group 2 is {2,3}, and a DMRS port included in CDM group 3 is {4,5 };

for the 2-symbol DMRS type2, the DMRS ports included in CDM group 1 are {0,1,6,7}, the DMRS ports included in CDM group 2 are {2,3,8,9}, and the DMRS ports included in CDM group 3 are {4,5,10,11 }.

4. Quasi co-location relationship

QCL relationships are used to indicate that there are one or more identical or similar communication characteristics between multiple antenna ports. For example, if two antenna ports have a quasi co-location relationship, the channel scale characteristic of one antenna port transmitting a signal can be inferred from the channel scale characteristic of the other antenna port transmitting a signal. For two antenna ports with QCL relationship, the signals corresponding to the two antenna ports have the same parameters; alternatively, the parameters of one antenna port may be used to determine the parameters of another antenna port having a QCL relationship with the antenna port; or, the parameter difference between the two antenna ports is smaller than a preset threshold.

Wherein, the parameters may include one or more of the following large-scale parameters of the channel: delay spread (delay spread), Doppler spread (Doppler spread), Doppler shift (Doppler shift), average delay (average delay), average gain, spatial Rx parameters.

5. TCI State (state)

The TCI state contains parameters for configuring the quasi co-location relationship between the downlink reference signal and the DMRS port. Specifically, the TCI state may configure a downlink reference signal having a quasi-co-location relationship with the DMRS port, and a quasi-co-location type.

Wherein the quasi co-located type is associated with at least one channel large scale parameter. For example, the large-scale parameters of the channel associated with the quasi-co-location type a include { doppler shift, doppler spread, average delay, delay spread }. The large-scale parameters of the channel associated with the quasi-co-location type B comprise Doppler shift and Doppler spread.

Currently, a network device may configure multiple TCI states for a terminal by using RRC signaling, and map 8 TCI states to a code point (codepoint) in a TCI field in DCI by using an activation instruction, so that one value (or codepoint) of the TCI field may correspond to one TCI state. For example, taking the TCI field as 3 bits, when codepoint of the TCI field is 000, the TCI field may indicate TCI state # 1; when codepoint of the TCI field is 111, the TCI field may indicate TCI status # 2.

In the description of this application, "/" means "or" unless otherwise stated, for example, A/B may mean A or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" means one or more, "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the description of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. If information indicated by certain information (for example, first indication information and second indication information described below) is referred to as information to be indicated, there are many ways of indicating the information to be indicated in a specific implementation process. For example, the information to be indicated may be directly indicated, wherein the information to be indicated itself or an index of the information to be indicated, and the like. For another example, the information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. For another example, only a part of the information to be indicated may be indicated, while the other part of the information to be indicated is known or predetermined. In addition, the indication of the specific information can be realized by means of the arrangement order of each information agreed in advance (for example, specified by a protocol), so that the indication overhead can be reduced to a certain extent.

The technical solution provided in the embodiment of the present application may be applied to various communication systems, for example, a New Radio (NR) communication system that adopts a fifth generation (5G) communication technology, a future evolution system, or a multiple communication convergence system, and the like. The technical scheme provided by the application can be applied to various application scenarios, for example, scenarios such as machine-to-machine (M2M), macro-micro communication, enhanced mobile internet (eMBB), ultra-reliable and ultra-low latency communication (urlcc), and mass internet of things communication (mtc). These scenarios may include, but are not limited to: communication scenarios between communication devices, network devices, communication scenarios between network devices and communication devices, etc. The following description is given by way of example in a communication scenario between a network device and a terminal.

Fig. 1 shows an architecture diagram of a communication system to which the technical solution provided by the present application is applicable, and the communication system may include one or more network devices (only 2 are shown in fig. 1) and one or more terminals (only one is shown in fig. 1). Wherein, a plurality of network devices can communicate with the same terminal by CoMP technology.

Fig. 2 shows an architecture diagram of a communication system to which the technical solution provided by the present application is applicable, where the communication system may include one or more network devices (only 1 is shown in fig. 2) and one or more terminals (only one is shown in fig. 2). The network device is configured with a plurality of antenna panels, and the plurality of antenna panels of the network device can communicate with the same terminal by using a CoMP technology.

It should be noted that fig. 1 and fig. 2 are only schematic diagrams, and do not limit application scenarios of the technical solutions provided in the present application.

The network device may be a base station or base station controller for wireless communication, etc. For example, the base station may include various types of base stations, such as: a micro base station (also referred to as a small station), a macro base station, a relay station, an access point, and the like, which are not specifically limited in this embodiment of the present application. In this embodiment, the base station may be a base station (BTS) in a global system for mobile communication (GSM), a Code Division Multiple Access (CDMA), a base station (node B) in a Wideband Code Division Multiple Access (WCDMA), an evolved base station (eNB or e-NodeB) in a Long Term Evolution (LTE), an internet of things (IoT) or a narrowband internet of things (NB-IoT), a base station in a future 5G mobile communication network or a Public Land Mobile Network (PLMN) in a future evolution, which is not limited in this embodiment. In this embodiment of the present application, the apparatus for implementing the function of the network device may be a network device, or may be an apparatus capable of supporting the network device to implement the function, for example, a chip system. In this embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and a technical solution provided in this embodiment of the present application is described.

A network device, such as a base station, generally includes a Base Band Unit (BBU), a Radio Remote Unit (RRU), an antenna, and a feeder for connecting the RRU and the antenna. Wherein, the BBU is used for being responsible for signal modulation. The RRU is responsible for radio frequency processing. The antenna is responsible for the conversion between guided waves on the cable and space waves in the air. On one hand, the length of a feeder line between the RRU and the antenna is greatly shortened by the distributed base station, so that the signal loss can be reduced, and the cost of the feeder line can also be reduced. On the other hand, the RRU and the antenna are smaller, so that the RRU can be installed anywhere, and the network planning is more flexible. Besides RRU remote, BBUs can be centralized and placed in a Central Office (CO), and the centralized mode can greatly reduce the number of base station rooms, reduce the energy consumption of corollary equipment, particularly air conditioners, and reduce a large amount of carbon emission. In addition, after the scattered BBUs are collected and become the BBU baseband pool, unified management and scheduling can be realized, and resource allocation is more flexible. In this mode, all physical base stations evolve into virtual base stations. All virtual base stations share information of data receiving and sending, channel quality and the like of users in a BBU baseband pool, and cooperate with each other to realize joint scheduling.

In some deployments, a base station may include a Centralized Unit (CU) and a Distributed Unit (DU). The base station may further include an Active Antenna Unit (AAU). The CU realizes part of the functions of the base station and the DU realizes part of the functions of the base station. For example, the CU is responsible for processing non-real-time protocols and services, and implements functions of a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer. The DU is responsible for processing a physical layer protocol and a real-time service, and implements functions of a Radio Link Control (RLC), a Media Access Control (MAC), and a Physical (PHY) layer. The AAU implements part of the physical layer processing functions, radio frequency processing, and active antenna related functions. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling or PDCP layer signaling, can also be considered to be sent by the DU or from the DU + AAU under this architecture. It is to be understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, a CU may be divided into network devices in the RAN, or may also be divided into network devices in a Core Network (CN), which is not limited herein.

The terminal is a device with wireless transceiving function. The terminal can be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a User Equipment (UE). Wherein the UE comprises a handheld device, an in-vehicle device, a wearable device, or a computing device with wireless communication capabilities. Illustratively, the UE may be a mobile phone (mobile phone), a tablet computer, or a computer with wireless transceiving function. The terminal device may also be a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in smart grid, a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and so on. In the embodiment of the present application, the apparatus for implementing the function of the terminal may be the terminal, or may be an apparatus capable of supporting the terminal to implement the function, such as a chip system. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the embodiment of the present application, a device for implementing a function of a terminal is taken as an example, and a technical solution provided in the embodiment of the present application is described.

In addition, the network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

Fig. 3 is a schematic diagram of hardware structures of a network device and a terminal according to an embodiment of the present application.

The terminal comprises at least one processor 101 and at least one transceiver 103. Optionally, the terminal may also include an output device 104, an input device 105, and at least one memory 102.

The processor 101, memory 102 and transceiver 103 are connected by a bus. The processor 101 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure. The processor 101 may also include multiple CPUs, and the processor 101 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores that process data (e.g., computer program instructions).

Memory 102 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, but is not limited to, electrically erasable programmable read-only memory (EEPROM), compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 102 may be a separate device and is connected to the processor 101 via a bus. The memory 102 may also be integrated with the processor 101. The memory 102 is used for storing application program codes for executing the scheme of the application, and the processor 101 controls the execution. The processor 101 is configured to execute the computer program code stored in the memory 102, thereby implementing the methods provided by the embodiments of the present application.

The transceiver 103 may use any transceiver or other device for communicating with other devices or communication networks, such as ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), etc. The transceiver 103 includes a transmitter Tx and a receiver Rx.

The output device 104 is in communication with the processor 101 and may display information in a variety of ways. For example, the output device 104 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 105 is in communication with the processor 101 and may receive user input in a variety of ways. For example, the input device 105 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.

The network device comprises at least one processor 201, at least one memory 202, at least one transceiver 203 and at least one network interface 204. The processor 201, memory 202, transceiver 203 and network interface 204 are connected by a bus. The network interface 204 is configured to be connected to a core network device through a link (e.g., an S1 interface), or connected to a network interface of another network device through a wired or wireless link (e.g., an X2 interface) (not shown in the drawings), which is not specifically limited in this embodiment of the application. In addition, the description of the processor 201, the memory 202 and the transceiver 203 may refer to the description of the processor 101, the memory 102 and the transceiver 103 in the terminal, and will not be repeated herein.

The technical solutions provided by the embodiments of the present application are specifically described below with reference to the drawings of the specification.

As shown in fig. 4, a method for indicating a DMRS port provided in an embodiment of the present application includes the following steps:

s101, the network equipment sends first indication information to the terminal. Correspondingly, the terminal receives the first indication information sent by the network equipment.

It will be appreciated that the network device may be any one or more of the TRPs used to transmit data to the terminal.

The first indication information is used for indicating N TCI states, and N is a positive integer.

As one implementation, the first indication information may indicate the N TCI states in a display manner. For example, the first indication information includes N TCI states.

As another implementation, the first indication information may indicate the N TCI states in an implicit manner. For example, the communication system is preconfigured with the correspondence relationship between the first indication information and the TCI status.

For example, taking the first indication information containing 3 bits as an example, the table 2 may be referred to for the correspondence relationship between the first indication information and the TCI status. Referring to table 2, when the first indication information is 000, the first indication information is used to indicate a TCI state corresponding to TRP1 and a TCI state corresponding to TRP 2. At this time, the number of TCI states indicated by the first indication information is 2. When the first indication information is 011, the first indication information is used for indicating the TCI state corresponding to the TRP 2. At this time, the number of TCI states indicated by the first indication information is 1.

TABLE 2

First indication information	TCI states
		000	TCI state for TRP1,TCI state for TRP2
001	TCI state for TRP2,TCI state for TRP1
		010	TCI state for TRP1
011	TCI state for TRP2
		…	…

It is understood that, for the terminal, the correspondence relationship between the first indication information and the TCI status may be pre-configured or configured by the network device through signaling. In the embodiment of the present application, the signaling may be semi-static signaling and/or dynamic signaling.

In the embodiment of the present application, the semi-static signaling may be Radio Resource Control (RRC) signaling, a broadcast message, a system message, or a Medium Access Control (MAC) Control Element (CE). The broadcast message may include a Remaining Minimum System Information (RMSI).

In the embodiment of the present application, the dynamic signaling may be physical layer signaling. The physical layer signaling may be signaling carried by a physical control channel or signaling carried by a physical data channel. Wherein the physical data channel may be a PDSCH. The physical control channel may be a Physical Downlink Control Channel (PDCCH), an Enhanced Physical Downlink Control Channel (EPDCCH), a Narrowband Physical Downlink Control Channel (NPDCCH), or a machine type communication physical downlink control channel (MPDCCH). The signaling carried by the PDCCH or EPDCCH may also be referred to as Downlink Control Information (DCI). The physical control channel may also be a physical sidelink control channel (physical sidelink control channel), and signaling carried by the physical sidelink control channel may also be referred to as Sidelink Control Information (SCI).

S102, the network equipment sends second indication information to the terminal. Correspondingly, the terminal receives the second indication information sent by the network equipment.

Wherein the second indication information is used for indicating at least one set of DMRS configuration information. Specifically, the second indication information is used to indicate DMRS configuration information corresponding to the number of different TCI states.

It should be noted that, in the present application, a group of DMRS configuration information is not limited to a specific concept, a plurality of DMRS configuration information may be regarded as one group, and the division between the groups is only a logical division, and may be a division for different TCI state configurations.

For example, the at least one set of DMRS configuration information indicated by the second indication information includes: and the corresponding group of DMRS configuration information when the number of the TCI states is 1, the corresponding group of DMRS configuration information when the number of the TCI states is 2, and so on.

For another example, the at least one set of DMRS configuration information indicated by the second indication information includes: and the corresponding group of DMRS configuration information when the number of the TCI states is less than the first threshold value, and the corresponding group of DMRS configuration information when the number of the TCI states is more than or equal to the first threshold value. In other words, the at least one set of DMRS configuration information indicated by the second indication information includes: and the corresponding group of DMRS configuration information when the number of the TCI states is greater than the second threshold value, and the corresponding group of DMRS configuration information when the number of the TCI states is less than or equal to the second threshold value. For example, the at least one set of DMRS configuration information indicated by the second indication information includes: and the corresponding group of DMRS configuration information when the number of the TCI states is 1, and the corresponding group of DMRS configuration information when the number of the TCI states is more than 1.

It can be understood that DMRS configuration information corresponding to different numbers of TCI states may be the same or different, and the embodiments of the present application are not limited thereto.

As an implementation manner, if the DMRS configuration information is stored in a DMRS port indication table, at least one set of DMRS configuration information indicated by the second indication information may be simultaneously stored in the same DMRS port indication table, or at least one set of DMRS configuration information indicated by the second indication information may be respectively stored in different DMRS port indication tables.

In the embodiment of the present application, the DMRS configuration information is used to indicate M DMRS ports. Or, the DMRS configuration information includes port numbers of M DMRS ports, where M is a positive integer.

Optionally, the DMRS configuration information further includes: the number of DMRS CDM groups not used for mapping data, and/or the number of preamble symbols. Of course, the DMRS configuration information may further include other parameters, which are not listed here in this embodiment of the application.

It should be noted that, if the DMRS configuration information does not include: the number of DMRS CDM groups not used for mapping data, the terminal may default to the number of maximum CDM groups or the number of CDM groups actually occupied by the DMRS port to the number of DMRS CDM groups not used for mapping data. If the DMRS configuration information does not include: the number of the preamble symbols, the terminal may default the number of the preamble symbols to 1, or other parameters.

For step S101 and step S102, the network device may send the first indication information and the second indication information independently, or may send the first indication information and the second indication information jointly.

Taking the example that the network device jointly sends the first indication information and the second indication information, the first indication information and the second indication information may be carried in the same DCI, the first indication information may multiplex a TCI domain in the current DCI, and the second indication information may multiplex an antipna port domain in the current DCI, thereby achieving backward compatibility and simplifying system design.

S103, the terminal determines a corresponding group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information according to the number of TCI states indicated by the first indication information.

In the embodiment of the present application, there is a correspondence relationship between the number of TCI states indicated by the first indication information, the second indication information, and the DMRS configuration information. Specifically, for different numbers of TCI states, the second indication information and the DMRS configuration information may have different corresponding relationships.

For example, the following table 3 may be referred to for a correspondence relationship between the number of TCI states indicated by the first indication information, the second indication information, and the DMRS configuration information. The value of the second indication information in table 3 may also be referred to as an index value, which is not limited in this embodiment of the present application.

TABLE 3

As exemplarily described with reference to table 3, when the value of the second indication information is 0, the second indication information is used to indicate two sets of DMRS configuration information, where the first set of DMRS configuration information includes DMRS port #0, and the second set of DMRS configuration information includes DMRS port #0 and DMRS port # 2. And when the value of the second indication information is 1, the second indication information is used for indicating two groups of DMRS configuration information, the first group of DMRS configuration information contains DMRS port #1, and the second group of DMRS configuration information contains DMRS port #1 and DMRS port # 3. In this way, if the number of TCI states indicated by the first indication information transmitted to the terminal by the network device is 1 and the value of the second indication information is 0, the terminal can determine that the DMRS configuration information includes DMRS port # 0.

Optionally, the corresponding relationship among the number of TCI states indicated by the first indication information, the second indication information, and the DMRS configuration information may be further specifically implemented as one of the following situations:

(1) and the number of the TCI states indicated by the first indication information is used for determining a first preset corresponding relation. It is understood that different numbers of TCI states correspond to different first predetermined correspondences.

The first preset corresponding relationship is a one-to-one corresponding relationship between the second indication information and the DMRS configuration information.

For example, when the number of TCI states indicated by the first indication information is 1, the first preset correspondence may refer to table 1. When the number of the TCI states indicated by the first indication information is 2, the first preset correspondence may refer to table 4. It should be understood that the first preset corresponding relationship shown in table 1 or table 4 is only an example, and does not limit the scheme provided in the embodiment of the present application.

TABLE 4

(2) And the second indication information is used for determining a second preset corresponding relation. It can be understood that the second indication information with different values corresponds to different second preset corresponding relationships.

And the second preset corresponding relation is a one-to-one corresponding relation between the number of the TCI states and the DMRS configuration information.

For example, when the value of the second indication information is 0, the second preset corresponding relationship may refer to table 5. When the value of the second indication information is 1, the second preset corresponding relationship may refer to table 6. It should be understood that the second preset corresponding relationship shown in table 5 or table 6 is only an example, and does not limit the scheme provided in the embodiment of the present application.

TABLE 5

Number of TCI states	Port number of DMRS port
		1	0
2	0,2
		……	……

TABLE 6

Number of TCI states	Port number of DMRS port
		1	1
2	1,3
		……	……

The details of DMRS configuration information and the like are described below in conjunction with specific schemes for transmitting data to a terminal by using multiple TRPs.

Exemplarily, assuming that the first indication information is used to indicate that the TPR1 corresponds to the TCI state #1 and the TRP2 corresponds to the TCI state #2, table 7 shows DMRS configuration information and corresponding explanations under various transmission schemes. Table 7 may be replaced with table 8. It should be noted that, in table 7 or table 8, a column corresponding to the transmission scheme may not be embodied in the protocol. That is, the DMRS port indication table defined by the protocol may not include contents of a column corresponding to the transmission scheme in table 7 or table 8.

In table 7 or table 8, # of layers indicates the number of layers for PDSCH transmission, for example: # of layers 2 indicates that the number of transport layers is 2. The letter v is generally used in the protocol to indicate the number of transport layers, so # of layers in tables 7 and 8 can be replaced by v.

The same row of dmrport in the table may be indicated by the same Value, and information such as TCI status, time domain resources, frequency domain resources, and redundancy version corresponding to the next DMRS port is obtained from other configuration information. The other configuration information may be indicated by higher layer signaling such as RRC, MAC CE, etc., or may be indicated by other fields in the DCI, such as a redundancy version indication field. "- >" means a correspondence relationship. Resource 1 refers to a block of resources, such as time-frequency resources. RB set1, RB set2 are examples of frequency domain resources, and resource block (resource block) is a representation of frequency domain resources. The frequency domain resource may also be a subcarrier, a resource block group (RB group, RBG), a Precoding resource block (Precoding resource block), a subband (subband), a bandwidth part (bandwidth part), a system bandwidth, a carrier (carrier), a serving cell (serving cell), and the like. Slot 1, Slot2 is an example of a time domain resource, a Slot, i.e., a time Slot. The time domain resources may also be symbols, mini-slots (i.e., units containing one or more symbols), half-slots, half-frames, subframes, frames, system frames, radio frames, etc.

It should be understood that table 7 or table 8 is only an example, and does not limit the technical solutions provided in the embodiments of the present application.

TABLE 7

TABLE 8

In the first scheme, a plurality of TRPs occupy the same time-frequency resource to send different data to the terminal.

That is, a plurality of TRPs transmit data to a terminal in Non-Coherent Transmission (NCJT) technology.

Wherein, the different data specifically refers to: different transport blocks, or different codewords, or different transport streams.

When data is transmitted in the NCJT technique, signals from multiple TRPs experience different channel large scale parameters, that is, signals from multiple TRPs are non-QCL. If the DMRS ports corresponding to the two TRPs are code-division, that is, the DMRS ports corresponding to the two TRPs are located in the same CDM group, the DMRSs of the two TRPs will interfere with each other, and the reception of the DMRSs by the terminal is affected, thereby affecting the demodulation performance. Based on this, the examples of the present application provide: when a plurality of TRPs transmit PDSCH in the same time-frequency resource, a plurality of DMRS ports in one CDM group belong to the same TRP. That is, DMRS ports corresponding to different TRPs belong to different CDM groups.

It should be noted that, if multiple TRPs transmit PDSCH in different time domain resources (or frequency domain resources), DMRS antenna ports corresponding to different TRPs may be the same or different; DMRS antenna ports corresponding to different TRPs may belong to the same CDM group, or may belong to different CDM groups.

Therefore, in the first scheme, in at least one set of DMRS configuration information indicated by the second indication information, DMRS ports included in DMRS configuration information corresponding to a TCI state greater than 2 belong to different CDM groups. Or, the DMRS configuration information corresponding to the TCI states of which the number is greater than 2 includes DMRS ports in different CDM groups.

Optionally, in the at least one group of DMRS configuration information indicated by the second indication information, DMRS ports included in the DMRS configuration information that corresponds to the number of TCI states K belong to at least K different CDM groups. Or, the DMRS configuration information corresponding to the number K of TCI states at least includes DMRS ports in K CDM groups, where K is an integer greater than 1.

For example, it is assumed that the first indication information indicates TCI state #1 corresponding to TRP1 and TCI state #2 corresponding to TRP 2; in this case, among the plurality of sets of DMRS configuration information indicated by the second indication information, one set of DMRS configuration information corresponding to the case where the number of TCI states is 2 includes DMRS port #0 and DMRS port # 1. Optionally, DMRS port #0 corresponds to TCI state #1, or DMRS port #0 is adopted for TRP 1. DMRS port #1 corresponds to TCI state #2, or, in other words, TRP2 employs DMRS port # 1. In this case, DMRS port #0 and DMRS port #1 belong to different CDM groups, e.g., DMRS port #0 belongs to CDM group #0 and DMRS port #1 belongs to CDM group # 1.

For another example, it is assumed that the first indication information indicates TCI state #1 corresponding to TRP1 and TCI state #2 corresponding to TRP 2; in this case, the DMRS configuration information corresponding to the number of TCI states 2 in the plurality of sets of DMRS configuration information indicated by the second indication information includes DMRS port #0, DMRS port #1, and DMRS port # 2. Optionally, DMRS port #0 corresponds to TCI state #1, or DMRS port #0 is adopted for TRP 1. DMRS port #1 and DMRS port #2 correspond to TCI state #2, or in other words, DMRS port #1 and DMRS port #2 are used for TRP 2. Illustratively, DMRS port #0 belongs to CDM group #0, DMRS port #1 belongs to CDM group #1, DMRS port #2 belongs to CDM group # 2. Alternatively, DMRS port #0 belongs to CDM group #0, DMRS port #1 and DMRS port #2 belong to CDM group # 1.

In addition, it should be noted that, in the first scheme, the number of transmission layers is equal to the number of port numbers of DMRS ports indicated by the DMRS configuration information. As described with reference to table 7, when the value of the second indication information is 0, the DMRS configuration information includes port numbers of two DMRS ports, and thus, the number of transmission layers is equal to 2.

And in the second scheme, a plurality of TRPs occupy the same time-frequency resource to send the same data to the terminal. And, the redundancy versions adopted by the data transmitted by the plurality of TRPs may not be the same.

That is, a plurality of TRPs transmit data to a terminal in a Space Division Multiplexing (SDM) manner.

As one implementation manner, for the first indication information, the N TCI states indicated by the first indication information may include a first TCI state and a second TCI state; wherein the first TCI state may be any one of N TCI states; the second TCI state is the other of the N TCI states except the first TCI state. For example, the first indication information indicates TCI state #1, TCI state #2, and TCI state # 3. If TCI state #1 is the first TCI state, then TCI state #2 and TCI state #3 are both the second TCI state.

The first TCI state corresponds to M first DMRS ports; the second TCI state corresponds to M second DMRS ports. Wherein the M first DMRS ports are configured by the corresponding set of DMRS configuration information (i.e., the set of DMRS configuration information determined in step S103). The M second DMRS ports are configured based on correspondence between the M second DMRS ports and the M first DMRS ports.

It should be noted that the M second DMRS ports corresponding to different second TCI states are different.

For convenience of description, the correspondence between the M second DMRS ports and the M first DMRS ports is hereinafter referred to as DMRS port correspondence for short. For a terminal, the DMRS port correspondence may be configured in advance, or may be configured by a network device through signaling.

For the description with reference to table 7, taking the value of the second indication information as 13 as an example, the DMRS port correspondence may be 0 to 2; 1-3. That is, DMRS port #0 corresponds to DMRS port #2, and DMRS port #1 corresponds to DMRS port # 3.

Optionally, in the second scheme, DMRS ports used by multiple TRPs do not belong to the same CDM group. In this case, the DMRS port correspondence may be: correspondence between DMRS ports within one CDM group and DMRS ports within another CDM group. For example: and the DMRS port with the sequence number i in one CDM group corresponds to the DMRS port with the sequence number i in the other CDM group, and i is a natural number. The sequencing rule can be that the DMRS ports in the CDM group are sequenced from small to large according to port numbers; alternatively, the ordering rule may also be that the DMRS ports in a CDM group are ordered from large to small according to port numbers.

For example, for 1-symbol DMRS type2, CDM group #1 contains DMRS ports {0,1}, CDM group #2 contains DMRS ports {2,3}, and CDM group #3 contains DMRS ports {4,5 }. Optionally, a corresponding relationship exists between the DMRS port #0, the DMRS port #2, and the DMRS port # 4; there is a correspondence between DMRS port #1, DMRS port #3, DMRS port # 5.

For example, with reference to table 7, taking the value of the second indication information as 13 as an example, the corresponding relationship of the DMRS ports is 0 to 2; 1-3; the DMRS configuration information contains a port number {0 }. Alternatively, the terminal can determine TCI state #1- > port0 and TCI state #2- > port 2. That is, the terminal can determine that TCI state #1 corresponds to DMRS port #0, and TCI state #2 corresponds to DMRS port # 2.

It should be noted that which DMRS ports each TCI state specifically corresponds to may be determined according to actual scenarios, pre-configuration, and other factors. Tables 7 and 8 are given by way of example only and are not intended to be limiting. For example, it can be defined in table 7 that, when the value of the second indication information is 13, TCI state #1- > port2 and TCI state #2- > port 0.

For example, with reference to table 7, taking the value of the second indication information as 15 as an example, the corresponding relationship of the DMRS ports is 0 to 2; 1-3; the DMRS configuration information contains port numbers {0,1 }. Optionally, the terminal can determine TCI state #1- > port0, 1, TCI state #2- > port2, 3. That is, the terminal can determine that the TCI state #1 corresponds to the DMRS port #0 and the DMRS port #1, and the TCI state #2 corresponds to the DMRS port #2 and the DMRS port # 3.

Since the signal of one TRP is QCL, one TRP may correspond to one TCI state. And the terminal determines information such as DMRS ports of the data transmitted by the plurality of TRPs according to the second indication information and the corresponding relation of the DMRS ports, namely, the terminal determines the plurality of DMRS ports and TCI states corresponding to the DMRS ports according to the second indication information and the corresponding relation of the DMRS ports. The terminal may also determine a correspondence of DMRS ports and redundancy versions.

For example, with reference to table 7, taking the value of the second indication information as 15 as an example, the terminal can determine that the TCI state #1 corresponds to the DMRS port #0 and the DMRS port #1, and the TCI state #2 corresponds to the DMRS port #2 and the DMRS port # 3. The terminal is also capable of determining redundancy versions corresponding to DMRS port #0 and DMRS port #1, which are different from redundancy versions corresponding to DMRS port #2 and DMRS port # 3.

As another implementation, the DMRS configuration information includes multiple sets of port numbers, and each set of port numbers corresponds to one TRP. It is understood that a set of port numbers includes at least one port number.

To explain with reference to table 8, taking the value of the second indication information as 15 as an example, the DMRS configuration information includes port numbers {0,1,2,3}, where DMRS port #0 and DMRS port #1 are a set of DMRS ports, and DMRS port #2 and DMRS port #3 are another DMRS port. In this way, the terminal can determine TCI state #1- > port0, 1, and TCI state #2- > port2, 3.

Based on the implementation mode, taking two TRPs as an example for transmitting data to the terminal, wherein a part of DMRS ports indicated by the DMRS configuration information correspond to the TCI state of a first TRP, and the data corresponding to the part of DMRS ports adopt a first redundancy version; another part of DMRS ports indicated by the DMRS configuration information corresponds to the TCI state of the second TRP, and data corresponding to the part of DMRS ports adopts a second redundancy version. The first redundancy version is different from the second redundancy version.

In addition, in the second scheme, the number of transmission layers is equal to the number of DMRS ports used by one TRP. Taking the value of the second indication information as 13 as an example, the TCI state #1- > port0, that is, the TRP1 adopts DMRS port0, as described in connection with table 7. Since TRP1 only employs 1 DMRS port, the number of transport layers is 1.

And in the third scheme, a plurality of TRPs occupy the same time-frequency resource to send the same data to the terminal. And, the redundancy versions adopted by the data transmitted by the plurality of TRPs are the same.

That is, a plurality of TRPs transmit data to a terminal in a Single Frequency Network (SFN) technology.

Based on scheme three, multiple TRPs may employ the same DMRS port. In this way, one DMRS port may correspond to a plurality of TCI information. Therefore, for one DMRS port, the terminal may obtain a channel parameter corresponding to each of the multiple TCI information, and average the channel parameters corresponding to the multiple TCI information to determine the channel information corresponding to the DMRS port, thereby implementing data demodulation.

As an implementation manner, in scheme three, the DMRS configuration information may include port numbers of the same multiple groups of DMRS ports. It is to be understood that the port numbers of the set of DMRS ports comprises a port number of at least one DMRS port.

One TRP corresponds to the port number of a set of DMRS ports. As such, the DMRS configuration information may indicate that multiple TPRs employ the same DMRS port.

Taking the value of the second indication information as 6 as an example, the DMRS configuration information includes a port number {0,0,1,1}, or the DMRS configuration information includes a port number {0,1,0,1}, which is described with reference to table 8. As can be seen, the DMRS configuration information contains the same two sets of port numbers {0,1 }. In this way, the terminal can determine TCI state #1- > port0, 1 and TCI state #2- > port0, 1.

As another implementation manner, in scheme three, the DMRS configuration information may include a port number of at least one DMRS port, and the port number included in the DMRS configuration information is not repeated. In this case, a plurality of TRPs each employ the DMRS port indicated by the DMRS configuration information.

With reference to table 7, taking the value of the second indication information as 6 as an example, the DMRS configuration information includes port numbers {0,1 }. In this case, TCI state #1- > port0, 1, TCI state #2- > port0, 1.

In a third scheme, multiple DMRS ports indicated by the DMRS configuration information may belong to the same CDM group, or belong to different CDM groups, which is not limited in this embodiment of the present invention.

It should be noted that, in the third scheme, DMRS ports of different TRPs use the same time-frequency resource.

In addition, it should be noted that the number of transmission layers is equal to the number of DMRS ports used by one TPR. Taking the value of the second indication information as 6 as an example, the DMRS configuration information includes port numbers {0,0,1,1}, and the TRP1 adopts DMRS port #0 and DMRS port #1, as described with reference to table 8. That is, TRP1 employs two DMRS ports, so the number of transport layers is 2.

And in the fourth scheme, a plurality of TRPs adopt different frequency domain resources to send data to the terminal. Optionally, the data transmitted by the plurality of TRPs may be the same or different.

That is, a plurality of TRPs transmit data to a terminal in a Frequency Division Multiplexing (FDM) manner.

It should be noted that, the frequency domain resource corresponding to each TRP in the plurality of TRPs may be configured by referring to the prior art, and is not described herein again. For example, the network device transmits DCI to the terminal to configure a frequency domain resource corresponding to each of a plurality of TRPs.

As an implementation manner, in scheme four, the DMRS configuration information may include port numbers of the same multiple groups of DMRS ports. It may be understood that the port numbers of the set of DMRS ports comprises a port number of the at least one DMRS port.

Taking the value of the second indication information as 9 as an example, the DMRS configuration information includes a port number {0,0,1,1}, or the DMRS configuration information includes a port number {0,1,0,1}, which is described with reference to table 8. As can be seen, the DMRS configuration information contains the same two sets of port numbers {0,1 }. In this way, the terminal can determine TCI state #1- > port0, 1 and TCI state #2- > port0, 1.

As another implementation manner, in scheme four, the DMRS configuration information may include a port number of at least one DMRS port, and the port number included in the DMRS configuration information is not repeated. In this case, a plurality of TRPs each employ the DMRS port indicated by the DMRS configuration information.

With reference to table 7, taking the value of the second indication information as 9 as an example, the DMRS configuration information includes port numbers {0,1 }. In this case, TCI state #1- > port0, 1, TCI state #2- > port0, 1.

It should be noted that, in the fourth scheme, DMRS ports of different TRPs use different frequency domain resources. For example, with reference to table 7, taking the value of the second indication information as 7 as an example, TCI state #1- > port 0- > RB set1, and TCI state #2- > port 0- > RB set 2. That is, the frequency domain resource used by DMRS port #0 corresponding to TCI state #1 is RB set1, and the frequency domain resource used by DMRS port #0 corresponding to TCI state #2 is RB set 2.

In addition, in the fourth scheme, the number of transmission layers is equal to the number of DMRS ports used by one TPR. With reference to table 8, taking the value of the second indication information as 9 as an example, the DMRS configuration information includes port numbers {0,0,1,1}, and the TRP1 adopts DMRS port #0 and DMRS port # 1. That is, TRP1 employs two DMRS ports, so the number of transport layers is 2.

And in the fifth scheme, a plurality of TRPs adopt different time domain resources to send data to the terminal. Alternatively, the data transmitted by the plurality of TRPs may be the same or different.

That is, a plurality of TRPs transmit data to a terminal in a Time Division Multiplexing (TDM) manner.

It should be noted that, the time domain resource corresponding to each TRP in the plurality of TRPs may be configured by referring to the prior art, and is not described herein again. For example, the network device transmits DCI to the terminal to configure a time domain resource corresponding to each of the plurality of TRPs.

As an implementation manner, in scheme five, the DMRS configuration information may include port numbers of the same multiple groups of DMRS ports. It is to be understood that the port numbers of the set of DMRS ports comprises a port number of at least one DMRS port.

Taking the value of the second indication information as 12 as an example, the DMRS configuration information includes a port number {0,0,1,1}, or the DMRS configuration information includes a port number {0,1,0,1}, which is described with reference to table 8. As can be seen, the DMRS configuration information contains the same two sets of port numbers {0,1 }. Optionally, the terminal can determine TCI state #1- > port0, 1, and TCI state #2- > port0, 1.

As another implementation manner, in scheme five, the DMRS configuration information may include a port number of at least one DMRS port, and the port number included in the DMRS configuration information is not repeated. In this case, a plurality of TRPs each employ the DMRS port indicated by the DMRS configuration information.

Taking the value of the second indication information as 12 as an example, the DMRS configuration information includes port numbers {0,1}, which is described with reference to table 7. In this case, TCI state #1- > port0, 1, TCI state #2- > port0, 1.

It should be noted that, in the fifth scheme, DMRS ports of different TRPs use different time domain resources. For example, with reference to table 7, taking the value of the second indication information as 10 as an example, the TCI state #1- > port 0- > slot 1 and the TCI state #2- > port 0- > slot2 are provided. That is to say, the time domain resource used by the DMRS port #0 corresponding to the TCI state #1 is slot 1, and the time domain resource used by the DMRS port #0 corresponding to the TCI state #2 is slot 2.

In addition, in the fifth scheme, the number of transmission layers is equal to the number of DMRS ports used by one TPR. Taking the value of the second indication information as 12 as an example, the DMRS configuration information includes port numbers {0,0,1,1}, and the TRP1 adopts DMRS port #0 and DMRS port #1, as described with reference to table 8. That is, TRP1 employs two DMRS ports, so the number of transport layers is 2.

In the third, fourth and fifth schemes, implementation forms of a set of DMRS configuration information are summarized below.

In the at least one group of DMRS configuration information indicated by the second indication information, the corresponding group of DMRS configuration information includes port numbers of K groups of DMRS ports when the number of TCI states is K. The port numbers of the K groups of DMRS ports are in one-to-one correspondence with the K TCI states, the port numbers of the K groups of DMRS ports are the same, and K is a positive integer.

Or, in the at least one set of DMRS configuration information indicated by the second indication information, the corresponding set of DMRS configuration information includes port numbers of a set of DMRS ports when the number of TCI states is K, where the port numbers of the set of DMRS ports correspond to the K DMRS states.

The above mainly introduces the scheme provided in the embodiment of the present application from the perspective of interaction between each network element. It is understood that each network element, such as the network device and the terminal, includes a hardware structure or a software module or a combination of both for performing each function in order to realize the functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the network device and the terminal may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given by taking the case of dividing each function module corresponding to each function:

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 5, the terminal includes: a communication module 301 and a processing module 302. The communication module 301 is used to support the terminal to execute steps S101 and S102 in fig. 4, or to support other processes of the technical solutions described herein. The processing module 302 is used to support the terminal to execute step S103 in fig. 4, or to support other processes of the technical solutions described herein.

As an example, in conjunction with the terminal shown in fig. 3, the communication module 301 in fig. 5 may be implemented by the transceiver 103 in fig. 2, and the processing module 302 in fig. 5 may be implemented by the processor 101 in fig. 3, which is not limited in this embodiment.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions; the computer readable storage medium, when run on the terminal shown in fig. 3, causes the terminal to perform the method shown in fig. 4. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as servers, data centers, and the like, that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium, or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

Embodiments of the present application also provide a computer program product containing computer instructions, which when run on the terminal shown in fig. 3, enables the terminal to execute the method shown in fig. 4.

The terminal, the computer storage medium, and the computer program product provided in the embodiments of the present application are all configured to execute the method provided above, and therefore, the beneficial effects achieved by the terminal, the computer storage medium, and the computer program product may refer to the beneficial effects corresponding to the method provided above, and are not described herein again.

Fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown in fig. 6, the network device includes a processing module 401 and a communication module 402. The processing module 401 is configured to generate first indication information and second indication information. The communication module 402 is used to support the network device to execute steps S101 and S102 in fig. 4, or to support other processes of the technical solutions described herein.

As an example, in conjunction with the network device shown in fig. 3, the communication module 402 in fig. 6 may be implemented by the transceiver 203 in fig. 3, and the processing module 401 in fig. 6 may be implemented by the processor 201 in fig. 3, which is not limited in this embodiment.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions; the computer readable storage medium, when run on the network device shown in fig. 3, causes the network device to perform the method shown in fig. 4. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (e.g., solid state disk), among others.

Embodiments of the present application also provide a computer program product containing computer instructions, which when run on the network device shown in fig. 3, enables the network device to execute the method shown in fig. 4.

The network device, the computer storage medium, and the computer program product provided in the embodiments of the present application are all configured to execute the method provided above, and therefore, the beneficial effects achieved by the method can refer to the beneficial effects corresponding to the method provided above, and are not described herein again.

Fig. 7 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip shown in fig. 7 may be a general-purpose processor or may be a dedicated processor. The chip includes a processor 501. The processor 501 is configured to support the communication apparatus to execute the technical solution shown in fig. 4.

Optionally, the chip further includes a transceiver pin 502, where the transceiver pin 502 is used for receiving the control of the processor 501, and is used to support the communication device to execute the technical solution shown in fig. 4.

Optionally, the chip shown in fig. 7 may further include: a storage medium 503.

It should be noted that the chip shown in fig. 7 can be implemented by using the following circuits or devices: one or more Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), controllers, state machines, gate logic, discrete hardware components, any other suitable circuitry, or any combination of circuitry capable of performing the various functions described throughout this application.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method for indicating a demodulation reference signal (DMRS) port, the method comprising:

receiving first indication information and second indication information; the first indication information is used for indicating N transmission configuration indication TCI states; the second indication information is used for indicating at least one group of DMRS configuration information, the group of DMRS configuration information comprises port numbers of M DMRS ports, and M, N are positive integers;

determining a corresponding group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information according to the number of TCI states indicated by the first indication information;

the N TCI states indicated by the first indication information comprise a first TCI state and a second TCI state;

the first TCI state corresponds to M first DMRS ports; wherein the M first DMRS ports are configured by the corresponding set of DMRS configuration information;

the second TCI state corresponds to M second DMRS ports; wherein the M second DMRS ports are configured based on correspondence between the M second DMRS ports and the M first DMRS ports.

2. The method for indicating the DMRS port of claim 1, wherein the number of TCI states indicated by the first indication information is used to determine a first preset correspondence, and the first preset correspondence is a correspondence between DMRS configuration information and second indication information.

3. The method according to claim 1, wherein the second indication information is used to determine a second predetermined correspondence relationship, and the second predetermined correspondence relationship is a correspondence relationship between DMRS configuration information and the number of TCI states.

4. The method for indicating DMRS ports according to any of claims 1 to 3, wherein at least two of the DMRS ports configured by the set of DMRS configuration information corresponding to TCI state number greater than 1 belong to different Code Division Multiplexing (CDM) groups among at least one set of DMRS configuration information indicated by the second indication information.

5. The method for indicating the DMRS ports according to any one of claims 1 to 3, wherein in the at least one set of DMRS configuration information indicated by the second indication information, the corresponding set of DMRS configuration information includes port numbers of K sets of DMRS ports when the number of TCI states is K, the port numbers of the K sets of DMRS ports are in one-to-one correspondence with the K sets of TCI states, the port numbers of the K sets of DMRS ports are the same, and K is a positive integer.

6. The method of indication of DMRS ports according to any of claims 1 to 3, characterized in that the set of DMRS configuration information further comprises: the number of code division multiplexing CDM groups, and/or the number of preamble symbols, which are not used for mapping data.

7. A method for indicating a demodulation reference signal (DMRS) port, the method comprising:

generating first indication information and second indication information, wherein the first indication information is used for indicating N Transmission Configuration Indication (TCI) states; the second indication information is used for indicating at least one group of DMRS configuration information, and the DMRS configuration information comprises port numbers of M DMRS ports; the number of TCI states indicated by the first indication information is used for determining a corresponding group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information; n, M are all positive integers;

sending the first indication information and the second indication information to a terminal;

8. The method for indicating the DMRS port of claim 7, wherein the number of TCI states indicated by the first indication information is used to determine a first preset correspondence, and the first preset correspondence is a correspondence between DMRS configuration information and second indication information.

9. The method according to claim 7, wherein the second indication information is used to determine a second predetermined correspondence relationship, and the second predetermined correspondence relationship is a correspondence relationship between the DMRS configuration information and the number of TCI states.

10. The method for indicating the DMRS ports according to any one of claims 7 to 9, wherein, in the at least one set of DMRS configuration information indicated by the second indication information, the DMRS ports configured by the DMRS configuration information with the TCI state number larger than 1 belong to different Code Division Multiplexing (CDM) groups.

11. The method for indicating the DMRS ports according to any one of claims 7 to 9, wherein, in the at least one set of DMRS configuration information indicated by the second indication information, the set of DMRS configuration information corresponding to the number K of TCI states includes port numbers of K sets of DMRS ports, the port numbers of the K sets of DMRS ports are in one-to-one correspondence with the K sets of TCI states, the port numbers of the K sets of DMRS ports are the same, and K is a positive integer.

12. The method of indication of DMRS ports according to any of the claims 7 to 9, wherein said set of DMRS configuration information further comprises: the number of code division multiplexing CDM groups, and/or the number of preamble symbols, which are not used for mapping data.

13. A terminal, comprising:

the communication module is used for receiving the first indication information and the second indication information; the first indication information is used for indicating N transmission configuration indication TCI states; the second indication information is used for indicating at least one group of DMRS configuration information, wherein the group of DMRS configuration information comprises port numbers of M DMRS ports, and M, N are positive integers;

the second TCI state corresponds to M second DMRS ports; wherein the M second DMRS ports are configured based on correspondence between the M second DMRS ports and the M first DMRS ports;

and the processing module is used for determining a group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information according to the number of TCI states indicated by the first indication information.

14. The terminal according to claim 13, wherein the number of TCI states indicated by the first indication information is used to determine a first preset correspondence, and the first preset correspondence is a correspondence between values of DMRS configuration information and second indication information.

15. The terminal of claim 13, wherein the second indication information is used to determine a second preset correspondence, and wherein the second preset correspondence is a correspondence between DMRS configuration information and the number of TCI states.

16. The terminal according to any one of claims 13 to 15, wherein, in the at least one set of DMRS configuration information indicated by the second indication information, at least two of DMRS ports configured by the set of DMRS configuration information corresponding to the set of DMRS configuration information with the number of TCI states greater than 1 belong to different code division multiplexing, CDM, groups.

17. The terminal according to any one of claims 13 to 15, wherein in the at least one set of DMRS configuration information indicated by the second indication information, the set of DMRS configuration information that corresponds to K TCI states includes K sets of DMRS port numbers, the K sets of DMRS port numbers and the K sets of DMRS ports are in one-to-one correspondence, the K sets of DMRS port numbers are the same, and K is a positive integer.

18. The terminal of any of claims 13 to 15, wherein the set of DMRS configuration information further comprises: the number of code division multiplexing CDM groups, and/or the number of preamble symbols, which are not used for mapping data.

19. A network device, comprising:

the processing module is used for generating first indication information and second indication information, wherein the first indication information is used for indicating the state of the TCI (transmission configuration indication) of the N transmission configurations; the second indication information is used for indicating at least one group of demodulation reference signal (DMRS) configuration information, and the DMRS configuration information comprises port numbers of M DMRS ports; the number of TCI states indicated by the first indication information is used for determining a corresponding group of DMRS configuration information from at least one group of DMRS configuration information indicated by the second indication information; n, M are all positive integers;

the second TCI state corresponds to M second DMRS ports; wherein the M second DMRS ports are configured based on a correspondence between the M second DMRS ports and the M first DMRS ports;

and the communication module is used for sending the first indication information and the second indication information to a terminal.

20. The network device of claim 19, wherein the number of TCI states indicated by the first indication information is used to determine a first preset correspondence, and wherein the first preset correspondence is a correspondence between DMRS configuration information and second indication information.

21. The network device of claim 19, wherein the second indication information is configured to determine a second preset correspondence, and wherein the second preset correspondence is a correspondence between DMRS configuration information and the number of TCI states.

22. The network device of any one of claims 19 to 21, wherein, in the at least one set of DMRS configuration information indicated by the second indication information, at least two of DMRS ports configured by DMRS configuration information with a number of TCI states greater than 1 belong to different code division multiplexing, CDM, groups.

23. The network device according to any one of claims 19 to 21, wherein, in the at least one set of DMRS configuration information indicated by the second indication information, the set of DMRS configuration information that corresponds to K TCI states includes K sets of DMRS port numbers, the K sets of DMRS port numbers and the K sets of DMRS ports are in one-to-one correspondence, the K sets of DMRS port numbers are the same, and K is a positive integer.

24. The network device of any one of claims 19 to 21, wherein the set of DMRS configuration information further comprises: the number of code division multiplexing CDM groups, and/or the number of preamble symbols, which are not used for mapping data.

25. A computer-readable storage medium, characterized in that it stores a computer program comprising program instructions that, when executed by a processor, cause the processor to carry out the method of indication of a demodulation reference signal, DMRS, port as defined in any one of claims 1 to 6, or to carry out the method of indication of a DMRS port as defined in any one of claims 7 to 12.

26. A communications device comprising at least one processor coupled to a memory for executing program instructions stored in the memory to implement the method of any one of claims 1 to 12.