CN110557348B

CN110557348B - Method and communication device for demodulating data

Info

Publication number: CN110557348B
Application number: CN201810557362.9A
Authority: CN
Inventors: 徐明慧; 张希
Original assignee: Chengdu Huawei Technology Co Ltd
Current assignee: Chengdu Huawei Technology Co Ltd
Priority date: 2018-06-01
Filing date: 2018-06-01
Publication date: 2020-12-08
Anticipated expiration: 2038-06-01
Also published as: WO2019228390A1; CN110557348A

Abstract

The application provides a method and a communication device for data demodulation, wherein the method comprises the steps that a receiving end device receives indication information sent by a sending end device; the receiving end equipment determines a layer number k of a current transmission layer according to the indication information, wherein k is an integer greater than or equal to 1; the receiving terminal equipment determines the transmitting signals of demodulation reference signals DMRS on the first k transmission layers; and the receiving end equipment demodulates the data of the kth transmission layer according to the transmitting signals of the DMRS on the first k transmission layers. According to the embodiment of the application, the data can be demodulated by the receiving terminal equipment according to the DMRS under the condition that the DMRS and the data experience different channels.

Description

Method and communication device for demodulating data

Technical Field

The present application relates to the field of communications, and in particular, to a method and a communication apparatus for demodulating data.

Background

In an existing Long Term Evolution (LTE) system, Multiple Input Multiple Output (MIMO) is a key technology of a physical layer, and is a method for improving system performance by using multiple transmitting antennas and multiple receiving antennas.

Before precoding, the system firstly maps data information to be transmitted to different layers through layer mapping so that the data information is distributed to different layers according to a certain mode, and then maps the data information distributed to the layers to a physical antenna through the precoding technology. The pre-coding technology can transfer some necessary signal processing processes which are difficult to implement at the receiving end to the transmitting end, thereby ensuring the signal performance of the transmission process.

The existing precoding technology is actually an adaptive technology, and a result of precoding data information changes correspondingly with a change of Channel State Information (CSI), and the data information preprocessing technology that changes in real time according to the change of CSI enables a terminal device to obtain correct target data information in the changing CSI, so precoding is a very key technology in LTE system MIMO.

The performance and complexity of different precoding modes are different from each other, typical precoding modes can be divided into two types, namely linear precoding and nonlinear precoding, and each type of precoding mode has a suitable working scene. However, in some scenarios, for example, when the interference between terminal devices is large, the gain provided by the linear precoding scheme is too small to meet the transmission requirement of the system, and at this time, the nonlinear precoding scheme can relatively meet the transmission requirement of the system.

Because the signal power in the non-linear precoding mode is increased, in order to avoid the transmission power being too large, the power of the transmission signal is generally required to be adjusted, and the power of the signal after power increase is generally adjusted in the following two modes: a power back-off mode and a modulo mode. The receiving end also performs corresponding power adjustment to detect the signal). When data and demodulation reference signals (DMRSs) are precoded by using a non-linear precoding scheme, in order to accurately estimate a channel, the DMRSs can only adjust power by means of power backoff, and therefore, when the data adjusts power by using a modulo method, a power backoff factor on the DMRS needs to be indicated to a terminal by a base station, which needs to occupy a certain overhead additionally.

In order to avoid the above problem of increasing overhead, one solution may be to use linear precoding for DMRS and a non-linear precoding scheme for data, however, in this case, DMRS and data experience different equivalent channels, and it is difficult for the receiving end device to estimate an effective channel of data according to DMRS to demodulate data.

Therefore, when different precoding schemes are used for the DMRS and the data, how to demodulate the data according to the DMRS becomes an urgent problem to be solved.

Disclosure of Invention

A method for demodulating data and a communication apparatus are provided, which are capable of demodulating data according to a DMRS when the DMRS and the data experience different channels.

In a first aspect, a method for demodulating data is provided, the method comprising: receiving end equipment receives indication information sent by sending end equipment;

the receiving end equipment determines a layer number k of a current transmission layer according to the indication information, wherein k is an integer greater than or equal to 1;

the receiving terminal equipment determines the transmitting signals of the demodulation reference signals DMRS on the first k transmission layers;

and the receiving terminal equipment demodulates the data of the kth transmission layer according to the transmitting signals of the DMRS on the first k transmission layers.

Therefore, under the condition that the DMRS adopts linear precoding and the data adopts nonlinear precoding, the embodiment of the application enables the receiving end equipment to estimate the effective channel of the data according to the DMRS for demodulating the data through the indication of the sending end equipment, and solves the problem that the effective channel of the data cannot be directly estimated and the data cannot be demodulated according to the DMRS receiving signal in the prior art.

With reference to the first aspect, in an implementation manner of the first aspect, the demodulating, by the receiving end device, data in a kth transport layer according to the transmission signals of the DMRSs in the first k transport layers includes:

the receiving terminal equipment determines a power backspacing factor lambda of the kth transmission layer data according to the transmitting signals of the DMRS on the first k transmission layers and the receiving signals of the DMRS on the kth transmission layer_k；

The receiving end equipment according to the power back-off factor lambda_kAnd demodulating the kth transport layer data.

Specifically, in the embodiment of the present application, the receiving end device obtains the channel parameters between the first k transmission layers and the kth transmission layer according to the transmission signals of the DMRSs on the first k transmission layers, and then can determine the power backoff of the kth transmission layer data according to the channel parameters between the first k transmission layers and the kth transmission layerFactor lambda_kAnd then realize the demodulation to the k transport layer data.

With reference to the first aspect, in an implementation manner of the first aspect, the receiving end device determines a power backoff factor λ of a kth transmission layer data according to the transmission signals of the DMRSs on the first k transmission layers and the received signal of the DMRS of the kth transmission layer_kThe method comprises the following steps:

the receiving terminal equipment determines a channel parameter l between a jth transmission layer and a kth transmission layer in the first k transmission layers according to the transmitting signals of the DMRS on the first k transmission layers and the receiving signals of the DMRS on the kth transmission layer_kjWherein j is an integer greater than or equal to 1 and less than or equal to k;

the receiving end equipment is used for receiving the channel parameter l between the jth transmission layer and the kth transmission layer in the first k transmission layers_kjDetermining a power backoff factor λ for the kth transport layer data_k。

With reference to the first aspect, in an implementation manner of the first aspect, the transmission signal of the DMRS on each transmission layer is transmitted through at least one subcarrier, where a channel parameter l between a jth transmission layer and the kth transmission layer_kjIncluding channel parameter/of each of at least one subcarrier carrying DMRS of jth transmission layer_kj(i)Wherein i represents the number of subcarriers carrying the DMRS of the j transmission layer;

the receiving terminal equipment determines a channel parameter l between a jth transmission layer and a kth transmission layer in the first k transmission layers according to the transmitting signals of the DMRS on the first k transmission layers and the receiving signals of the kth transmission layer_kjThe method comprises the following steps:

the receiving end equipment corresponds to the k transmission layerDetermining a channel parameter l by a DMRS receiving signal on an ith subcarrier and a transmitting signal of a DMRS of a jth transmission layer on the ith subcarrier_kj(i)。

After determining the channel parameter l_kj(i)Then, the receiving end device can determine the power backoff factor λ of the ith subcarrier corresponding to the kth transport layer data_k(i). And then realize the demodulation to the kth layer data, solve the problem in the prior art.

It should be understood that, in the embodiment of the present application, the indication information may directly indicate the layer number k of the current transport layer, or may indirectly indicate the layer number k of the current transport layer, and as an example and without limitation, the following describes 6 possible cases in which the indication information indirectly indicates the layer number of the current transport layer in the embodiment of the present application.

With reference to the first aspect, in an implementation manner of the first aspect, the indicating information is used to indicate a DMRS port number k of a current transmission layer, where the DMRS port number and a layer number of the transmission layer have a one-to-one correspondence, and the determining, by the receiving end device, the layer number k of the current transmission layer according to the indicating information includes: and the receiving terminal equipment determines the DMRS port number k as the layer number k of the current transmission layer.

Under the condition that the DMRS port number and the layer number of the transmission layer have a one-to-one correspondence relationship, the embodiment of the application indirectly indicates the layer number k of the current transmission layer by indicating the DMRS port number through the sending terminal device, does not need extra signaling to specially indicate the layer number of the transmission layer, and can save signaling overhead.

With reference to the first aspect, in an implementation manner of the first aspect, the indicating information is used to indicate a sequence index k of a transmission signal of a DMRS of a current transmission layer, where the index of the sequence of the transmission signal of the DMRS and a layer number of the transmission layer have a one-to-one correspondence, and the determining, by the receiving end device, the layer number k of the current transmission layer according to the indicating information includes: and the receiving terminal equipment determines the sequence index number k of the transmitting signal of the DMRS as the layer number k of the current transmission layer.

Therefore, in the embodiment of the present application, the layer number k of the current transmission layer is indirectly indicated by the transmitting terminal device indicating the sequence index number k of the transmission signal of the DMRS of the current transmission layer, and the embodiment of the present application does not need an additional signaling to specifically indicate the layer number of the transmission layer, so that signaling overhead can be saved.

With reference to the first aspect, in an implementation manner of the first aspect, the indicating information is used to indicate a sequence index of a transmission signal of a previous k-layer DMRS, and the determining, by the receiving end device, a layer number k of a current transmission layer according to the indicating information includes: the receiving terminal equipment determines the layer number k of the current transmission layer according to the sequence index number of the transmitting signals of the DMRS;

therefore, in the embodiment of the present application, the layer number k of the current transmission layer is indirectly indicated by the sequence index number of the transmission signal of the DMRS indicated by the sending end device, and the layer number of the transmission layer is not specifically indicated by an additional signaling in the embodiment of the present application, so that signaling overhead can be saved.

With reference to the first aspect, in an implementation manner of the first aspect, the indicating information is used to indicate a sequence scrambling identifier of a DMRS of a previous k layers, and the determining, by the receiving end device, a layer number k of a current transmission layer according to the indicating information includes: and the receiving terminal equipment determines the layer number k of the current transmission layer according to the sequence scrambling identification number of the DMRS.

Therefore, the layer number k of the current transmission layer is indirectly indicated through the sequence scrambling identification number of the DMRS indicated by the sending terminal device, and the layer number of the transmission layer is not required to be specially indicated by extra signaling, so that signaling overhead can be saved.

With reference to the first aspect, in an implementation manner of the first aspect, the indicating information is used to indicate a sequence scrambling identity index k of a DMRS of a current transmission layer, where the sequence scrambling identity index of the DMRS has a one-to-one correspondence with a layer number of the transmission layer, and the determining, by the receiving end device, the layer number k of the current transmission layer according to the indicating information includes: and the receiving terminal equipment determines the sequence scrambling identification index number k of the DMRS as the layer number k of the current transmission layer.

Therefore, in the embodiment of the present application, the layer number k of the current transmission layer is indirectly indicated by indicating the sequence scrambling identifier index number k of the DMRS of the current transmission layer through the sending end device, and the embodiment of the present application does not need an additional signaling to specifically indicate the layer number of the transmission layer, so that signaling overhead can be saved.

With reference to the first aspect, in an implementation manner of the first aspect, the indicating information is used to indicate a sequence scrambling identity index of a DMRS of a previous k layers, and the determining, by the receiving end device, a layer number k of a current transmission layer according to the indicating information includes: and the receiving terminal equipment determines the layer number k of the current transmission layer according to the number of the sequence scrambling identification indexes of the DMRS.

Therefore, in the embodiment of the application, the layer number k of the current transmission layer is indirectly indicated by the number of the sequence scrambling identification indexes of the DMRS indicated by the sending end device, and the embodiment of the application does not need extra signaling to specifically indicate the layer number of the transmission layer, so that signaling overhead can be saved.

After the layer number k of the current transmission layer is determined, the terminal device needs to determine a transmission signal of the DMRS on the k-th transmission layer, so as to determine a power backoff factor λ of the kth transmission layer data according to the transmission signal of the DMRS on the k-th transmission layer_k。

Some implementations of the receiving end device determining the transmission signal of the DMRS on the front k transmission layer are described below.

With reference to the first aspect, in an implementation manner of the first aspect, the determining, by the receiving end device, transmission signals of DMRSs on first k transmission layers includes:

and the receiving end equipment determines the transmitting signal of the DMRS on the kth transmission layer according to the high-level signaling and/or the position of the DMRS mapping resource, and determines the transmitting signals of the DMRS on the 1 st to the kth-1 th transmission layers according to the sequence index of the transmitting signal of the DMRS indicated by the transmitting end equipment.

Specifically, the receiving end device may determine the transmission signal of the DMRS on the kth transport layer according to higher layer signaling (e.g., Radio Resource Control (RRC) signaling downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID)) and/or DMRS mapping Resource location.

In this implementation manner, the method may further include that the sending end device sends the higher layer signaling and/or position indication information used for indicating the position of the DMRS mapping resource to the receiving end device.

Further, the determining, by the receiving end device, the transmission signal of the DMRS on the 1 st to k-1 th transmission layers according to the sequence index of the transmission signal of the DMRS indicated by the transmitting end device includes:

the receiving end equipment determines the transmitting signals of the DMRS on the 1 st to the k-1 th transmission layers from a preset DMRS sequence set according to the sequence indexes of the transmitting signals of the DMRS on the 1 st to the k-1 th transmission layers indicated by the transmitting end equipment, wherein the DMRS sequence set comprises one or more DMRS sequences specially defined for nonlinear precoding.

In this implementation manner, the method may further include the transmitting end device transmitting, to the receiving end device, index indication information indicating sequence indexes of transmission signals of the DMRSs on the 1 st to k-1 st transmission layers.

Specifically, the transmitting end device and the receiving end device may locally store the preset DMRS sequence set, where the DMRS sequence set includes sequences of transmission signals of multiple DMRSs. It should be understood that the preset DMRS sequence set may be a specific sequence set formed by sequences of the multiple DMRS transmission signals when there is a nonlinear precoding user and/or a nonlinear precoding layer, each sequence corresponds to an index number, and a correspondence between the sequences and the index numbers in the sequence set and/or the set may be notified by signaling, or may be predetermined, predefined, or preconfigured by both the transceiver and the transmitter, which is not limited in this embodiment of the application. The transmitting end device may indicate an index of a sequence of the DMRS transmission signal of each of the first k-1 transmission layers, and the receiving end device may determine the DMRS transmission signals of the first k-1 transmission layers from the preset DMRS sequence set according to the indicated index.

With reference to the first aspect, in one implementation manner of the first aspect,

and the receiving terminal equipment determines the transmitting signal of the DMRS on the kth transmission layer according to the high-level signaling and/or the position of the DMRS mapping resource, and determines the transmitting signals of the DMRS on the 1 st to the kth-1 th transmission layers according to the sequence scrambling identifier of the DMRS.

Further, the receiving end equipment determines the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers according to the sequence scrambling identifier of the DMRS, and the method comprises the following three ways of determining the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers by the receiving end equipment:

optionally, in an implementation manner of the first aspect, the receiving end device determines, according to a default sequence scrambling identifier of the DMRS, transmission signals of the DMRSs on the 1 st to k-1 th transmission layers, where DMRS scrambling identifier signaling of all transmission layers is default;

optionally, in an implementation manner of the first aspect, the receiving end device determines, according to the sequence scrambling identifier of the DMRS configured by the DMRS scrambling identifier signaling, transmission signals of DMRSs on transmission layers 1 to k-1, where the sequence scrambling identifiers of the DMRSs corresponding to all the transmission layers are the same;

optionally, in an implementation manner of the first aspect, the receiving end device determines, according to a radio network temporary identifier RNTI that is preconfigured and used as a sequence scrambling identifier for nonlinear precoding, transmission signals of DMRSs on 1 st to k-1 th transmission layers, where the sequence scrambling identifiers of the DMRSs corresponding to all transmission layers are the RNTI.

the receiving terminal equipment determines the transmitting signals of the DMRS on the kth transmission layer according to the high-level signaling and/or the position of the DMRS mapping resource, and determines the transmitting signals of the DMRS on the 1 st to the kth-1 th transmission layers according to the layer number of the current transmission layer, wherein the transmitting signals of the DMRS corresponding to the transmission layers correspond to the layer numbers of the transmission layers one to one.

In the embodiment of the application, the receiving end equipment can prestore the transmitting signal sequences of the DMRS corresponding to the layer numbers one by one, and the receiving end equipment respectively takes the transmitting signal sequences of the DMRS corresponding to the layer numbers 1 to k-1 from the prestored transmitting signal sequences of the plurality of DMRSs as the transmitting signal sequences of the DMRSs of the transmission layers 1 to k-1 according to the layer number k of the current transmission layer.

It should be understood that the one-to-one correspondence relationship between the transmission signal sequence of the DMRS and the layer number of the transmission layer may be that the sequence k of the transmission signal of the DMRS corresponds to the layer number k of the transmission layer, and optionally, the one-to-one correspondence relationship may also be other correspondence relationships, for example, the sequence k1 of the transmission signal of the DMRS corresponds to the transmission layer number k2, where k1 and k2 may not be equal. It should be understood that the one-to-one correspondence may be pre-configured or predefined or indicated by signaling, and the embodiments of the present application are not limited thereto. In the case that the one-to-one correspondence is indicated by signaling, the method may further include the transmitting end device transmitting, to the receiving end device, information indicating the one-to-one correspondence between the transmission signal of the DMRS and the layer number of the transmission layer.

In a second aspect, a method for demodulating data is provided, and it should be understood that the method of the second aspect corresponds to the first aspect, the method of the second aspect may be performed by a sending end device, the method of the first aspect may be indicated by a receiving end device interacting with the sending end device, actions performed by the sending end device correspond to actions performed by the receiving end device, and in particular, the scheme and beneficial effects of the interaction between the sending end device and the receiving end device may be referred to the description of the first aspect, and detailed description is appropriately omitted to avoid redundancy.

Specifically, the method comprises the following steps: the sending end equipment generates indication information, wherein the indication information is used for determining a layer number k of a current transmission layer, and k is an integer greater than or equal to 1;

and the sending end equipment sends indication information to the receiving end equipment, so that the receiving end equipment determines the layer number k of the current transmission layer according to the indication information, and demodulates the data of the kth transmission layer according to the transmitting signals of the DMRS on the first k transmission layers.

With reference to the second aspect, in an implementation manner of the second aspect, the indication information is used to indicate a DMRS port number k of a current transport layer; the indication information is used for indicating a sequence index k of a transmitting signal of the DMRS of the current transmission layer; the indication information is used for indicating the sequence index of a transmitting signal of the front k-layer DMRS; the indication information is used for indicating a sequence scrambling identifier of the DMRS of the front k layers; the indication information is used for indicating a sequence scrambling identification index k of the DMRS of the current transmission layer; the indication information is used for indicating a sequence scrambling identification index of the front k layers of DMRS; or the indication information is used for indicating the layer number k of the current transmission layer.

With reference to the second aspect, in an implementation manner of the second aspect, the method further includes: the sending end equipment sends at least one of the following information to the receiving end equipment: DMRS maps resource location information; the sequence scrambling identifier used for configuring the nonlinear precoding is configuration information of a Radio Network Temporary Identifier (RNTI); sequence index information of transmission signals of DMRSs on 1 st to k-1 th transmission layers; DMRS scrambling identification signaling of all transmission layers; information indicating that DMRS transmission signals of all transmission layers are the same; and information indicating a one-to-one correspondence relationship between the transmission signal of the DMRS and the layer number of the transmission layer. .

In a third aspect, a communication device is provided, which includes various modules or units for performing the method in any one of the possible implementations of the first aspect and the first aspect.

In one implementation, the communication apparatus is a receiving end device. For example, the receiving end device is a terminal device.

In a fourth aspect, a communication device is provided, which includes various modules or units for performing the methods in any possible implementation manner of the second aspect.

In one implementation, the communication device is a sending end device. For example, the sending end device is a network device.

In a fifth aspect, a communications apparatus is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the communication device performs the method of the first aspect and possible implementations thereof.

In a sixth aspect, a communications apparatus is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the communication device performs the method of the second aspect and possible implementations thereof.

In a seventh aspect, a computer-readable medium is provided, on which a computer program is stored, which, when executed by a computer, implements the method of the first aspect or any possible implementation manner of the first aspect.

In an eighth aspect, a computer-readable medium is provided, on which a computer program is stored, which, when executed by a computer, implements the method of the second aspect, any of the possible implementations of the second aspect.

A ninth aspect provides a computer program product which, when executed by a computer, implements the method of any one of the possible implementations of the first aspect.

A tenth aspect provides a computer program product which, when executed by a computer, implements the method of the second aspect, any of its possible implementations.

In an eleventh aspect, a processing apparatus is provided that includes a processor.

In one implementation, the method of any one of the above first to second aspects or possible implementations of the first to second aspects is performed by the processor, in which case the processor may be a dedicated processor.

In another implementation, the processing apparatus may further include a memory, the memory storing code, and the processor executing the code in the memory to perform the method in any of the above first to second aspects or any possible implementation manners of the first to second aspects, in which case the processor may be a general-purpose processor.

It will be appreciated that the data interaction process concerned in the eleventh aspect, for example, the process of transmitting data may be a process of outputting data from the processor, and the process of receiving data may be a process of receiving input data from the processor. In particular, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing device in the above eleventh aspect may be a chip, the processor may be implemented by hardware or may be implemented by software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a twelfth aspect, a system is provided, which includes the foregoing sending end device and receiving end device.

Drawings

Fig. 1 is a schematic diagram of a scenario of a communication system to which an embodiment of the present application is applicable.

FIG. 2 is a schematic diagram of a data processing process according to one embodiment of the present application.

FIG. 3 is a schematic flow chart diagram of a method for demodulating data according to one embodiment of the present application.

FIG. 4 is a schematic diagram of resource mapping according to an embodiment of the present application.

FIG. 5 is a schematic diagram of resource mapping according to another embodiment of the present application.

Fig. 6 is a schematic flow chart diagram of a method for demodulating data according to another embodiment of the present application.

Fig. 7 is a schematic flow chart diagram of a method for demodulating data according to another embodiment of the present application.

Fig. 8 is a schematic diagram of a communication device according to one embodiment of the present application.

Fig. 9 is a schematic diagram of a terminal device according to another embodiment of the present application.

FIG. 10 is a schematic diagram of a communication device according to another embodiment of the present application

FIG. 11 is a schematic diagram of a network device according to another embodiment of the present application

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

Embodiments of the present application are applicable to various communication systems, and thus, the following description is not limited to a specific communication system. For example, the embodiments of the present invention may be applied to a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Wireless Local Area Network (WLAN), a wireless fidelity (WiFi), and a next generation communication system, i.e., a fifth generation communication system (i.e., a radio generation 5 (G5, 5) communication system, such as a new NR communication system.

In this embodiment, the network device may be a Base Transceiver Station (BTS) in global system for mobile communications (GSM) or Code Division Multiple Access (CDMA), a base station (nodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved node B (eNB/eNodeB) in Long Term Evolution (LTE), a relay station or an access point, or a network device in a future 5G network, for example, a transmission point (TRP or transmission point) in an NR system, a base station (gbb) in an NR system, a radio unit in an NR system, such as a remote radio unit, a base station in a 5G system, or a set of antennas (including multiple TP panels). But also wearable devices or vehicle-mounted devices, etc. Different network devices may be located in the same cell or different cells, and are not limited herein.

In some deployments, the gNB may include a Centralized Unit (CU) and a Distributed Unit (DU). The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) layers, and the DU implements Radio Link Control (RLC), Medium Access Control (MAC) and Physical (PHY) layers. 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 PHCP layer signaling, may also be considered to be transmitted by the DU or by the DU + RU under this architecture. It is to be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in the access network RAN, or may be divided into network devices in the core network CN, which is not limited herein.

In the embodiments of the present application, a terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a household appliance, a wearable device, a drone device, and a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

By way of example, and not limitation, in embodiments of the present invention, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.

The embodiment of the present application may be applicable to any of the above communication systems, for example, the embodiment of the present application may be applicable to an LTE system and a subsequent evolution system such as 5G, or other wireless communication systems using various wireless access technologies, such as systems using access technologies like code division multiple access, frequency division multiple access, time division multiple access, orthogonal frequency division multiple access, single carrier frequency division multiple access, etc., and is particularly applicable to a scenario that requires channel information feedback and/or applies a secondary precoding technology, for example, a wireless network using a large-scale array-input-multiple-output (M-MIMO) technology, a wireless network using a distributed antenna technology, etc.

Fig. 1 is a schematic diagram of a scenario of a communication system to which an embodiment of the present application is applicable. As shown in fig. 1, the communication system 100 includes a network device 102, and the network device 102 may include multiple antenna groups. Each antenna group can include multiple antennas, e.g., one antenna group can include

antennas

104 and 106, another antenna group can include

antennas

106 and 110, and an additional group can include

antennas

112 and 114. 2 antennas are shown in fig. 1 for each antenna group, however, more or fewer antennas may be utilized for each group. Network device 102 can additionally include a transmitter chain and a receiver chain, each of which can comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.

Network device 102 may communicate with a plurality of terminal devices, such as terminal device 116 and terminal device 122. However, it is understood that network device 102 may communicate with any number of terminal devices similar to

terminal devices

116 or 122.

End devices

116 and 122 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100.

As shown in fig. 1, terminal device 116 is in communication with

antennas

112 and 114, where

antennas

112 and 114 transmit information to terminal device 116 over forward link 116 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with

antennas

104 and 106, where

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

In a Frequency Division Duplex (FDD) system, forward link 116 may utilize a different frequency band than that used by reverse link 120, and forward link 124 may utilize a different frequency band than that used by reverse link 126, for example.

As another example, in Time Division Duplex (TDD) systems and full duplex (full duplex) systems, forward link 116 and reverse link 120 may use a common frequency band and forward link 124 and reverse link 126 may use a common frequency band.

Each group of antennas and/or area designed for communication is referred to as a sector of network device 102. For example, antenna groups may be designed to communicate to terminal devices in a sector of the areas covered by network device 102. During communication by network device 102 with

terminal devices

116 and 122 over forward links 116 and 124, respectively, the transmitting antennas of network device 102 may utilize beamforming to improve signal-to-noise ratio of forward links 116 and 124. Moreover, mobile devices in neighboring cells can experience less interference when network device 102 utilizes beamforming to transmit to

terminal devices

116 and 122 scattered randomly through an associated coverage area, as compared to a manner in which a network device transmits through a single antenna to all its terminal devices.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting apparatus and/or a wireless communication receiving apparatus. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (e.g., generate, receive from other communication devices, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.

Furthermore, the communication system 100 may be a public land mobile network PLMN (public land mobile network) network or device-to-device (D2D) network or machine-to-machine (M2M) network or other networks, which is illustrated in fig. 1 for ease of understanding only and is a simplified schematic diagram, and other network devices may be included in the network, which are not shown in fig. 1.

Fig. 2 shows the main steps of a data processing procedure performed by a transmitting end (e.g., a network device) before data is transmitted through an Orthogonal Frequency Division Multiplexing (OFDM) symbol. As shown in fig. 2, a traffic stream from an upper layer (e.g., a Medium Access Control (MAC) layer) is subjected to channel coding, and then the obtained codeword is subjected to scrambling, modulation, layer mapping, and then mapped to one or more layers, and then subjected to precoding processing, resource unit mapping, and finally the modulated symbol is transmitted through an antenna port.

Accordingly, the receiving end (e.g., terminal device) can demodulate the data. The specific data processing procedures can be referred to the description in the existing standard.

The precoding technique may be that, under the condition that the channel state is known, a signal to be transmitted is pre-processed at a transmitting end, that is, the signal to be transmitted is processed by means of a precoding matrix matched with channel resources, so that the pre-coded signal to be transmitted is adapted to a channel, and the complexity of eliminating the inter-channel influence at the receiving end is reduced. Therefore, by precoding the transmitted signal, the received signal quality (e.g., signal to interference plus noise ratio (SINR)) is improved. Therefore, by using the precoding technology, the transmission of the transmitting end device and the multiple receiving end devices on the same time-frequency resource can be realized, that is, the multi-user multiple input multiple output (MU-MIMO) is realized. It should be noted that the description related to the precoding technology is only for example, and is not used to limit the protection scope of the embodiment of the present application, and in the specific implementation process, precoding may also be performed in other manners (for example, precoding is performed by using a preset precoding matrix or a weighting processing manner when a channel matrix cannot be known), and details are not repeated herein.

The main function of the MIMO technology is to provide spatial diversity and spatial multiplexing gain, MIMO utilizes multiple transmitting antennas to transmit signals with the same information through different paths, and can obtain multiple independently fading signals of the same data symbol at a receiving end, thereby obtaining improved receiving reliability of diversity, and spatial diversity of the MIMO technology can be used to combat channel fading.

The precoding technology not only can effectively inhibit the interference of a plurality of users in the MIMO system, but also can greatly simplify the algorithm of a receiving end and simultaneously obviously improve the system capacity.

Therefore, by precoding the transmitted signal, the received signal quality (e.g., signal to interference plus noise ratio (SINR)) is improved. Therefore, by using the precoding technology, the transmission of the transmitting end device and the multiple receiving end devices on the same time-frequency resource can be realized, that is, the multi-user multiple input multiple output (MU-MIMO) is realized.

In order to obtain a precoding matrix that can be adapted to a channel, a transmitting end performs channel estimation in advance, usually by sending a reference signal, and obtains feedback from a receiving end, thereby determining a more accurate precoding matrix to perform precoding processing on data to be transmitted. Specifically, the sending end may be a network device, the receiving end may be a terminal device, the reference signal may be a reference signal used for downlink channel measurement, for example, a channel state information reference signal (CSI-RS), and the terminal device may perform CSI measurement according to the received CSI-RS and feed back CSI of a downlink channel to the network device; the sending end may also be a terminal device, the receiving end may be a network device, and the reference signal may be a reference signal used for uplink channel measurement, for example, a Sounding Reference Signal (SRS). The network device may perform channel estimation and/or CSI measurement according to the received SRS, and indicate CSI of the uplink channel to the terminal device. The CSI may include, for example, but not limited to, a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), a Channel Quality Indicator (CQI), and the like.

It should be understood that the communication method and the type of the reference signal applied to the reference signal in the present application are not particularly limited. For example, for downlink data transmission, the sending end may be, for example, a network device, the receiving end may be, for example, a terminal device, and the reference signal may be, for example, a channel state information reference signal (CSI-RS); for uplink data transmission, the sending end may be, for example, a terminal device, the receiving end may be, for example, a network device, and the reference signal may be, for example, a Sounding Reference Signal (SRS); for device to device (D2D) data transmission, the transmitting end may be, for example, a terminal device, the receiving end may also be, for example, a terminal device, and the reference signal may be, for example, an SRS.

It should be understood that the above-listed types of reference signals are exemplary only, and should not constitute any limitation on the present application, nor should the present application exclude the possibility of using other reference signals to achieve the same or similar functionality.

The performance and complexity of different precoding modes are different from each other, typical precoding modes can be divided into two types, namely linear precoding and nonlinear precoding, and each type of precoding mode has a suitable working scene. Linear precoding and nonlinear precoding are separately described below.

Linear precoding is the linear processing of the acquired channel state information. Typical linear precoding algorithms may include Zero Forcing (ZF) precoding and its various improved algorithms, Minimum Mean Square Error (MMSE) precoding, Block Diagonalization (BD) precoding, and optimized signal to leakage noise ratio (SLNR) precoding. The linear precoding has the advantages of low operation complexity, simple implementation and strong practicability, but is greatly influenced by channel correlation, because when a channel matrix H is ill-conditioned, equivalent noise of a receiving end is increased, so that demodulation and detection are influenced, and system performance loss is brought.

Nonlinear precoding is to perform nonlinear operation on a channel matrix (such as introducing iteration, interference cancellation, modulus extraction, and power back-off), and typical nonlinear precoding manners may include Dirty Paper Coding (DPC), modular algebraic precoding (THP), and Vector Perturbation (VP) precoding. The nonlinear precoding has the advantages of excellent performance, less influence of channel correlation and high complexity.

When DMRS employs linear precoding and data employs non-linear precoding, in this case, DMRS and data experience different equivalent channels. The receiving end equipment cannot directly demodulate data according to the DMRS.

In view of the foregoing problems, embodiments of the present application provide a communication method capable of demodulating data according to DMRS when the DMRS uses linear precoding and the data uses nonlinear precoding.

For convenience of understanding and explanation, the following description will be given by way of example, and not limitation, to describe the execution process and actions of the communication method of the present application in a communication system.

By way of example, and not limitation, the method of embodiments of the present application is described below in conjunction with FIG. 3. Fig. 3 is a schematic flow diagram of a method of communication according to one embodiment of the invention. The method shown in fig. 3 is described from the perspective of a network device interacting with a terminal device. The method shown in fig. 3 can be applied to downlink transmission and also can be applied to uplink transmission, where in the downlink transmission, the sending end device is a network device, and the receiving end device is a terminal device; in uplink transmission, the sending end device is a terminal device, and the receiving end device is a network device. The following is only described in detail by taking downlink transmission as an example, and the process of uplink transmission may refer to the description of downlink transmission herein.

It should be understood that, in this embodiment of the present application, a sending end device may also be referred to as a sending end, and a receiving end device may also be referred to as a receiving end, and this embodiment of the present application is not limited thereto.

In order to make the solution of the embodiment of the present application easier to understand, as an example, but not by way of limitation, a relationship between a transmission signal transmitted by a transmitting end device and a reception signal received by a receiving end device in a scenario where DMRS employs linear precoding and a data signal employs nonlinear precoding is described below.

It should be understood that, in this embodiment of the present application, a signal transmitted by a transmitting end device includes a DMRS signal and data, and correspondingly, a signal received by a receiving end device may include a DMRS and data.

It should be understood that, in the embodiment of the present application, the data may be data carried by a Physical Downlink Shared Channel (PDSCH) or a physical uplink shared channel (PDSCH), for example, the data is carried by a PUSCH in uplink transmission, and the data may be carried by a PDSCH in downlink transmission.

Because the DMRS and the data use different precoding schemes, the DMRS and the data experience different equivalent channels.

For example, the received signal of the data of the kth transmission layer (for example, the data is carried by the PDSCH or the PUSCH) is:

y_k＝l_kkλ_ka_k+n_k (1)

wherein, y_kA received signal representing kth transport layer data; l_kkRepresenting a channel corresponding to a k-th transmission layer; lambda [ alpha ]_kRepresenting a power back-off factor corresponding to the kth transmission layer data; a is_kRepresenting the original transmit signal (e.g., a Quadrature Amplitude Modulation (QAM) signal) on the kth transport layer; n is_kRepresenting the noise corresponding to the k-th transport layer.

The received signal corresponding to the DMRS transmission signal of the j layer received by the kth transport layer is:

y_dmrs,kj＝l_kjs_j+n_k (2)

wherein, y_dmrs,kjRepresents a received DMRS signal on a kth transport layer; j is 1,2_jA transmission signal representing a DMRS on the jth transmission layer; l_kjRepresenting a channel parameter carrying between a jth transport layer and the kth transport layer; n is_kIndicating that the kth transport layer corresponds to noise.

Wherein l_kjWhen j is smaller than k, L is the element of the jth row and jth column of the lower triangular matrix L obtained by orthogonal triangular (QR) decomposition of the channel matrix H_kjRepresenting the interference of the j layer signal to the k layer signal; when j is equal to k, l_kjRepresenting a channel corresponding to a k-th layer signal; specifically, the relationship of L to H is as follows:

H^H＝QR＝QL^H

from the above equation (1), it can be found that the equivalent channel of data is l_kkλ_kTherefore, to demodulate data, the parameter λ needs to be known_kAnd l_kkOr the product l of the two_kkλ_k。

From equation (2), it can be found that l can be calculated when j ═ k_kk. Therefore, the key issue for demodulating data from DMRS is how to determine λ_k. And due to lambda_kCan be expressed in the following form:

therefore, according to equation (3), l is determined_kkOn the basis of (1) as long as l can be determined_k1To l_k，k-1I.e. can determine lambda_k。

That is, according to formula (3), the receiving end device may determine the channel parameter l between the transmission signal of the DMRS on each of the first k transmission layers and the kth transmission layer according to formula (3)_kjDetermining a power backoff factor λ for the kth transport layer data_k。

Also according to the above formula (2), y can be obtained_kAnd s_jI.e. can determine l_kj. Due to y_kIs a signal received by the receiving end device, therefore, the receiving end device only needs to be able to determine the transmission signal s of the DMRS corresponding to the first k layer (j-th layer)_jI.e., l can be determined according to equation (2)_kj. Further, λ is obtained according to the formula (3)_kAnd further, demodulation of data can be achieved according to equation (1) without considering i.

It should be understood that the above equations (1) to (3) are only examples of the relationship between the transmission signal and the reception signal, and in practical applications, the relationship between the transmission signal and the reception signal in the embodiment of the present application may also be in other equation forms, and the embodiment of the present application is not limited thereto.

It should be understood that the term "precoding manner" herein may also be referred to as a precoding scheme, a precoding mode, a precoding category, or a precoding type, and the like, and the embodiments of the present application are not limited thereto.

It should be understood that, in this embodiment of the present application, the data and the DMRS may be mapped on different Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the data and the DMRS may also be mapped on the same OFDM symbol, which is not limited to this.

It should be noted that, in the embodiment of the present application, a port (may also be referred to as an antenna port) may be understood as a reference signal port, and one reference signal corresponds to one antenna port, and a port in the embodiment of the present application may also be a DMRS port, which may be a logical port or a physical antenna port, and one port corresponds to one transport layer, and those skilled in the art may understand the meaning thereof.

It should be understood that, in the embodiment of the present application, the transmission signal of the DMRS on the transmission layer may refer to an original transmission sequence (or an original transmission sequence) of the DMRS, for example, the original transmission sequence refers to a signal obtained by Quadrature Amplitude Modulation (QAM) or Quadrature Phase Shift Keying (QPSK) modulation. In the embodiment of the present application, a transmission signal of the DMRS on the transport layer may also be referred to as an original transmission sequence of the DMRS of the transport layer.

Hereinafter, for convenience of understanding and explanation, the implementation processes and actions of the method for demodulating data according to the embodiment of the present application in the communication system are described in detail in conjunction with fig. 3 according to the above analysis by way of example and not limitation.

Specifically, the method 300 as shown in FIG. 3 includes:

the sending end device sends indication information to the receiving end device 310.

Specifically, the sending end device generates indication information and sends the indication information to the receiving end device, and accordingly, the receiving end device receives the indication information. The indication information is used for the receiving end device to determine a layer number k of the current transmission layer, where k is an integer greater than or equal to 1.

Specifically, according to the above description, in order to achieve data demodulation through DMRS, a receiving end device (e.g., a terminal device) needs to determine a specific value of a layer number k of a current transmission layer, so as to determine l to be estimated_kjThe number of (2). That is, when the receiving end device determines the value of k, k channel parameters l need to be calculated_kjI.e. l_k1To l_kk。

It should be understood that, in the embodiment of the present application, the indication information may directly indicate the layer number k of the current transport layer, or may indirectly indicate the layer number k of the current transport layer, and as an example and without limitation, the following describes 6 possible cases in which the indication information indirectly indicates the layer number k of the current transport layer in the embodiment of the present application.

The first condition is as follows:

the indication information is used for indicating the DMRS port number k of the current transmission layer, wherein the DMRS port number and the layer number of the transmission layer have a one-to-one correspondence relationship.

Optionally, in a first case, the one-to-one correspondence may be that the DMRS port number k corresponds to a layer number k of a transmission layer, and optionally, the one-to-one correspondence may also be other correspondences, for example, the DMRS port number k1 corresponds to a transmission layer number k2, where k1 and k2 may be unequal. It should be understood that the one-to-one correspondence may be pre-configured or predefined or indicated by signaling, and the embodiments of the present application are not limited thereto.

In the first case, a case of determining the layer number of the current transmission layer through the DMRS port number is described, optionally, in this application, the indication information may be specifically used to indicate the DMRS port number and other information (for example, port numbers of other reference signals (for example, CSI-RS port numbers, SRS port numbers) and/or DMRS sequence index numbers, and the receiving end device may determine the layer number of the current transmission layer through the DMRS port number in combination with the other information. For example, in one implementation, the layer number of the current transport layer is the sum or product of the DMRS port number and a value indicated by other information (e.g., the value is the port number of other reference signals or the DMRS sequence index number, etc.). For example, the DMRS port number is 2, and the value indicated by the other information is 4, the layer number of the current transmission may be 8 (i.e., 2 × 4) or the layer number of the current transmission layer may be 6 (i.e., 2+4), and so on. For another example, in another implementation, the layer number of the current transport layer needs to be represented by n bits, in this embodiment of the present application, the DMRS port number may correspond to n1 bits, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the receiving end device may determine n bit values corresponding to the layer number according to specific values of the n1 bits and the n2 bits, so as to determine the layer number.

The embodiments of the present application are not limited thereto.

Case two:

the indication information is used for indicating the index number k of the sequence of the transmitting signal of the DMRS of the current transmission layer, wherein the index number of the sequence of the transmitting signal of the DMRS and the layer number of the transmission layer have a one-to-one correspondence relationship.

Under the condition that the sequence index numbers of the transmission signals of the DMRS and the layer numbers of the transmission layers have a one-to-one correspondence relationship, the embodiment of the application indirectly indicates the layer number k of the current transmission layer through the sequence index numbers of the transmission signals of the sending end equipment indicating the DMRS, and through the sequence index numbers of the transmission signals of the DMRS, the receiving end equipment can determine the transmission signals of the DMRS of the kth transmission layer according to the sequences of a plurality of locally stored DMRS transmission signals and can also determine the layer number k of the current transmission layer according to the index numbers. The sequences of the multiple DMRS transmission signals may form a unique sequence set when there is a nonlinear precoding user and/or a nonlinear precoding layer, and each sequence corresponds to an index number, and the sequence set and/or the corresponding relationship between the sequences and the index numbers in the set may be notified by a signaling, or may be agreed, predefined, or configured in advance by both the transceiver and the transmitter, which is not limited in this embodiment of the present application.

Optionally, in the second case, the one-to-one correspondence may be that the sequence index k of the transmission signal of the DMRS corresponds to the layer number k of the transmission layer, and optionally, the one-to-one correspondence may also be other correspondences, for example, the sequence index k1 of the transmission signal of the DMRS corresponds to the transmission layer number k2, where k1 and k2 may be unequal. It should be understood that the one-to-one correspondence may be pre-configured or predefined or indicated by signaling, and the embodiments of the present application are not limited thereto.

In the case two, the case that the layer number of the current transmission layer is determined by the sequence index number of the transmission signal of the DMRS is described, optionally, in this application, the indication information may be specifically used to indicate the sequence index number of the transmission signal of the DMRS and other information (for example, port numbers of other reference signals (for example, CSI-RS port numbers, SRS port numbers), and/or the DMRS sequence index number, and the receiving end device may determine the layer number of the current transmission layer by combining the sequence index number of the transmission signal of the DMRS and the other information. For example, in one implementation, the layer number of the current transport layer is the sum or product of the sequence index number of the transmission signal of the DMRS and a value indicated by other information (e.g., the value is a port number of other reference signals or the DMRS sequence index number, etc.). For example, if the sequence index of the transmission signal of the DMRS is 2, and the other information indicates a numerical bit of 4, the layer number of the current transmission may be 8 (i.e., 2 × 4) or the layer number of the current transmission layer may be 6 (i.e., 2+4), and so on. For another example, in another implementation manner, the layer number of the current transmission layer needs to be represented by n bits, in this embodiment of the present application, the sequence index number of the transmission signal of the DMRS may correspond to n1 bits, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the receiving end device may determine n bit values corresponding to the layer number according to specific values of the n1 bits and the n2 bits, so as to determine the layer number.

Case three:

the indication information is used for indicating the sequence index of the transmitting signal of the front k layer or the front k-1 layer DMRS.

According to the foregoing description, in order to demodulate data according to DMRS, a receiving end device needs to determine transmission signals of DMRSs of respective transmission layers of the first k transmission layers. In one case, the transmitting end device and the receiving end device may locally store sequences of transmission signals of multiple DMRSs, where the sequences of the transmission signals of multiple DMRSs may form a unique sequence set when a nonlinear precoding user and/or a nonlinear precoding layer are provided, each sequence corresponds to an index number, and a correspondence between the sequence set and/or the sequence in the set and the index number may be notified by a signaling, or may be predetermined, predefined, or preconfigured by both the transmitting and receiving ends, which is not limited in this embodiment of the present application.

The transmitting end device may indicate an index of a sequence of the DMRS transmission signal of each of the first k or first k-1 transmission layers, and the receiving end device may determine the DMRS transmission signals of the first k or first k-1 transmission layers according to the indicated index. It should be understood that, in the case that the transmitting end device indicates the first k-1 indexes, the receiving end device may determine the transmission signal of the DMRS of the kth transmission layer in other manners, for example, the transmission signal of the DMRS on the kth transmission layer may be determined by higher layer signaling (e.g., Radio Resource Control (RRC) signaling downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID)) and/or DMRS mapping Resource location. In this case, the receiving end device may determine the layer number k of the current transport layer according to the received index number k or k-1.

Case four:

the indication information is used for indicating sequence scrambling identification of the DMRS of the front k layer or the front k-1 layer.

According to the foregoing description, in order to demodulate data according to DMRSs, a receiving end device needs to determine transmission signals of DMRSs of respective transmission layers of the first k transmission layers. In one case, the sending end device may indicate the sequence scrambling identifier of the transmission signal of the DMRS of each of the first k or first k-1 transmission layers, and then the receiving end device may determine that the layer number of the current transmission layer is k according to the number of the indicated sequence scrambling identifiers. It should be understood that, in the case that the transmitting end device indicates the first k-1 sequence scrambling identifiers, the receiving end device may determine the sequence scrambling identifiers of the transmission signals of the DMRS of the kth transmission layer in other manners.

Case five:

the indication information is used for indicating a sequence scrambling identification index k of the DMRS of the current transmission layer, wherein the sequence scrambling identification index of the DMRS and the layer number of the transmission layer have a one-to-one correspondence relationship.

Under the condition that the sequence scrambling identification index number of the DMRS and the layer number of the transmission layer have a one-to-one correspondence relationship, the sending end equipment indicates the sequence scrambling identification index number of the DMRS to indirectly indicate the layer number k of the current transmission layer, and through the sequence scrambling identification index number of the DMRS, the receiving end equipment can determine the sequence scrambling identification of the DMRS of the kth transmission layer according to the locally stored sequence scrambling identifications of the DMRS and can also determine the layer number k of the current transmission layer according to the sequence scrambling identification index number. The sequence scrambling identifiers of the DMRSs may form a sequence scrambling identifier set of a specific DMRS when the DMRSs is precoded by a non-linear user and/or on a non-linear precoding layer, each sequence scrambling identifier of the DMRSs corresponds to an index number, and the sequence scrambling identifier set of the DMRSs and/or a corresponding relationship between the sequence scrambling identifiers of the DMRSs in the set and the index numbers may be notified by signaling, or may be agreed, predefined, or preconfigured by both the transceiver and the transmitter, which is not limited in this embodiment of the present application.

Optionally, in the fifth case, the one-to-one correspondence may be that the sequence scrambling identifier index k of the DMRS corresponds to the layer number k of the transmission layer, and optionally, the one-to-one correspondence may also be other correspondences, for example, the sequence scrambling identifier index k1 of the DMRS corresponds to the transmission layer number k2, where k1 and k2 may be unequal. It should be understood that the one-to-one correspondence may be pre-configured or predefined or indicated by signaling, and the embodiments of the present application are not limited thereto.

In case five, a case that the layer number of the current transmission layer is determined by using the sequence scrambling identifier index number of the DMRS is described, optionally, in this application, the indication information may be specifically used to indicate that the sequence scrambling identifier index number of the DMRS is combined with other information (e.g., port numbers of other reference signals (e.g., CSI-RS port numbers, SRS port numbers) and/or DMRS sequence index numbers, and the receiving end device may determine the layer number of the current transmission layer by using the sequence scrambling identifier index number of the DMRS in combination with other information (e.g., port numbers of other reference signals (e.g., CSI-RS port numbers, SRS port numbers) and/or DMRS sequence index numbers). For example, in one implementation, the layer number of the current transport layer is a sum or a product of the sequence scrambling identity index number of the DMRS and a value indicated by other information (e.g., the value is a port number of other reference signals or a DMRS sequence index number, etc.). For example, if the sequence scrambling identifier index of the DMRS is 2 and the other information indicates a numerical bit of 4, the layer number of the current transmission layer may be 8 (i.e., 2 × 4) or the layer number of the current transmission layer may be 6 (i.e., 2+4), and so on. For another example, in another implementation, the layer number of the current transmission layer needs to be represented by n bits, in this embodiment of the application, the sequence scrambling identifier index number of the DMRS may correspond to n1 bits, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the receiving end device may determine the n bit values corresponding to the layer number according to the specific values of the n1 bits and the n2 bits, so as to determine the layer number.

Case six:

the indication information is used for indicating a sequence scrambling identification index of the DMRS of the front k layer or the front k-1 layer.

According to the foregoing description, in order to demodulate data according to DMRSs, a receiving end device needs to determine transmission signals of DMRSs of respective transmission layers of the first k transmission layers. In one case, the sending end device and the receiving end device may locally store sequence scrambling identifiers of multiple DMRSs, where the sequence scrambling identifiers of the multiple DMRSs may form a sequence scrambling identifier set of a specific DMRS when a nonlinear precoding user and/or a nonlinear precoding layer is used, and each sequence scrambling identifier of the DMRSs corresponds to one index number, and a correspondence between the sequence scrambling identifier set of the DMRSs and/or the sequence scrambling identifiers of the DMRSs in the set and the index numbers may be notified by a signaling, and may also be predetermined, predefined, or preconfigured by both the sending and receiving ends, which is not limited in this embodiment of the present application.

The transmitting end device may indicate the sequence scrambling identifier index of the DMRS of each of the first k or first k-1 transmission layers, and the receiving end device may determine the sequence scrambling identifier of the DMRS of the first k or first k-1 transmissions according to the indicated index. It should be understood that, in the case that the transmitting end device indicates the first k-1 sequence scrambling identity indexes, the receiving end device may determine the sequence scrambling identity of the DMRS of the kth transmission layer in other manners. In this case, the receiving end device may determine the layer number k of the current transmission layer according to the number k or k-1 of the sequence scrambling identity indexes of the received DMRSs.

And 320, the receiving end device determines the layer number k of the current transmission layer according to the indication information, wherein k is an integer greater than or equal to 1.

Specifically, according to the above description, in order to implement data demodulated through DMRS, a receiving device (e.g., a receiving device) needs to determine a specific value of a layer number k of a current transmission layer, so as to determine l to be estimated_kjThe number of (2). That is, when the receiving end device determines the value of k, it needs to calculate each channel parameter l of k_kjI.e. l_k1To l_kk。

The following describes specific schemes for determining the layer number k of the current transport layer in the embodiments of the present application, respectively, with reference to 6 cases of the indication information.

The first condition is as follows:

the indication information is used to indicate a DMRS port number k of a current transport layer, where the DMRS port number and the layer number of the transport layer have a one-to-one correspondence, and in 320, the receiving end device determines the DMRS port number k as the layer number k of the current transport layer.

Specifically, the receiving end device can determine the DMRS port number k according to the instruction of the sending end device, and because the DMRS port number and the transport layer number have a one-to-one correspondence, the receiving end device can directly determine the port number k as the layer number of the current transport layer.

Optionally, when the indication information is specifically used to indicate the DMRS port number and other information, the receiving device may determine the layer number of the current transport layer by combining the DMRS port number and other information. For example, in one implementation, the layer number of the current transport layer is the sum or product of the DMRS port number and a value indicated by other information (e.g., the value is the port number of other reference signals or the DMRS sequence index number, etc.). For example, the DMRS port number is 2, and the value indicated by the other information is 4, the receiving end device may determine that the layer number of the current transmission may be 8 (i.e., 2 × 4) or the layer number of the current transmission layer may be 6 (i.e., 2+4), and the like. For another example, in another implementation, the layer number of the current transport layer needs to be represented by n bits, in this embodiment of the present application, the DMRS port number may correspond to n1 bits, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the receiving end device may determine the n bit values corresponding to the layer number according to specific values of the n1 bits and the n2 bits, so as to determine the layer number.

According to the embodiment of the application, the sending terminal equipment indicates the DMRS port number to indirectly indicate the layer number k of the current transmission layer, the receiving terminal equipment can determine the layer number of the current transmission layer, extra signaling is not needed to specially indicate the layer number of the transmission layer, and signaling overhead can be saved.

Case two:

the indication information is used to indicate a sequence index k of a transmission signal of a DMRS of a current transmission layer, where the index of the sequence of the transmission signal of the DMRS and the layer number of the transmission layer have a one-to-one correspondence, and in 320, the receiving end device determines the sequence index k of the transmission signal of the DMRS as the layer number k of the current transmission layer.

Specifically, under the condition that the sequence index number of the transmission signal of the DMRS and the layer number of the transmission layer have a one-to-one correspondence relationship, in the embodiment of the present application, the sequence index number of the transmission signal of the DMRS is indicated by the sending end device to indirectly indicate the layer number k of the current transmission layer, and through the sequence index number of the transmission signal of the DMRS, the receiving end device may determine the transmission signal of the DMRS of the kth transmission layer according to the sequences of the plurality of locally stored DMRS transmission signals, and may also determine the layer number k of the current transmission layer according to the index number.

Optionally, when the indication information is specifically used to indicate the sequence index number of the transmission signal of the DMRS and other information (e.g., port numbers of other reference signals (e.g., CSI-RS port numbers, SRS port numbers) and/or DMRS sequence index numbers, etc.), the receiving device may determine the layer number of the current transmission layer by combining the sequence index number of the transmission signal of the DMRS and the other information. For example, in one implementation, the layer number of the current transport layer is the sum or product of the sequence index number of the transmission signal of the DMRS and a value indicated by other information (e.g., the value is a port number of other reference signals or the DMRS sequence index number, etc.). For example, if the sequence index of the transmission signal of the DMRS is 2, and the other information indicates a numerical bit of 4, the layer number of the current transmission may be 8 (i.e., 2 × 4) or the layer number of the current transmission layer may be 6 (i.e., 2+4), and so on. For another example, in another implementation manner, the layer number of the current transmission layer needs to be represented by n bits, in this embodiment of the present application, the sequence index number of the transmission signal of the DMRS may correspond to n1 bits, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the receiving end device may determine n bit values corresponding to the layer number according to specific values of the n1 bits and the n2 bits, so as to determine the layer number.

Therefore, in the embodiment of the present application, the sending end device indicates the sequence index number k of the transmission signal of the DMRS of the current transmission layer to indirectly indicate the layer number k of the current transmission layer, and the receiving end device can determine the layer number of the current transmission layer.

Case three:

the indication information is used to indicate sequence indexes of transmission signals of the front k layer or the front k-1 layer of the DMRS, and in 320, the receiving end device determines the layer number k of the current transmission layer according to the number of the sequence indexes of the transmission signals of the DMRS.

Specifically, the transmitting end device and the receiving end device may locally store sequences of transmission signals of a plurality of DMRSs, the transmitting end device may indicate an index of the sequence of the transmission signal of the DMRS of each of the first k or first k-1 transmission layers, and the receiving end device may determine the transmission signals of the first k or first k-1 transmission DMRSs according to the indicated index. It should be understood that, in the case that the transmitting end device indicates the first k-1 indexes, the receiving end device may determine the transmission signal of the DMRS of the kth transmission layer in other manners, for example, the transmission signal of the DMRS on the kth transmission layer may be determined by higher layer signaling (e.g., Radio Resource Control (RRC) signaling downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID)) and/or DMRS mapping Resource location. In this case, the receiving end device may determine the layer number k of the current transport layer according to the received index number k or k-1.

Therefore, in the embodiment of the present application, the layer number k of the current transmission layer is indirectly indicated by the number of the sequence indexes of the transmission signals of the DMRS indicated by the sending end device, and the receiving end device can determine the layer number of the current transmission layer.

Case four:

the indication information is used to indicate the sequence scrambling identifier of the DMRS of the previous k layers or the previous k-1 layers, and in 320, the receiving end device determines the layer number k of the current transmission layer according to the number of the sequence scrambling identifiers of the DMRS.

Specifically, the sending end device may indicate sequence scrambling identifiers of the DMRS transmission signals of the first k or first k-1 transmission layers, and then the receiving end device may determine that the layer number of the current transmission layer is k according to the number of the indicated sequence scrambling identifiers. It should be understood that, in the case that the transmitting end device indicates the first k-1 sequence scrambling identifiers, the receiving end device may determine the sequence scrambling identifiers of the transmission signals of the DMRS of the kth transmission layer in other manners.

Therefore, in the embodiment of the present application, the layer number k of the current transmission layer is indirectly indicated by the number of the sequence scrambling identifiers of the DMRS indicated by the sending end device, and the receiving end device can determine the layer number of the current transmission layer.

Case five:

the indication information is used to indicate a sequence scrambling identification index k of the DMRS of the current transmission layer, where the sequence scrambling identification index k of the DMRS has a one-to-one correspondence with the layer number of the transmission layer, and in 320, the receiving end device determines the sequence scrambling identification index k of the DMRS as the layer number k of the current transmission layer.

Specifically, under the condition that the sequence scrambling identification index number of the DMRS has a one-to-one correspondence relationship with the layer number of the transmission layer, in the embodiment of the present application, the sending end device indicates the sequence scrambling identification index number of the DMRS to indirectly indicate the layer number k of the current transmission layer, and through the sequence scrambling identification index number of the DMRS, the receiving end device may determine the sequence scrambling identification of the DMRS of the kth transmission layer according to the locally stored sequence scrambling identification index numbers of the multiple DMRSs, and may also determine the layer number k of the current transmission layer according to the index number.

Optionally, when the indication information is specifically used to indicate the sequence scrambling identity index number of the DMRS and other information (e.g., port numbers of other reference signals (e.g., CSI-RS port numbers, SRS port numbers) and/or DMRS sequence index numbers, etc.), the receiving device may determine the layer number of the current transmission layer by combining the sequence scrambling identity index number of the DMRS and other information (e.g., port numbers of other reference signals (e.g., CSI-RS port numbers, SRS port numbers) and/or DMRS sequence index numbers, etc.). For example, in one implementation, the layer number of the current transport layer is a sum or a product of the sequence scrambling identity index number of the DMRS and a value indicated by other information (e.g., the value is a port number of other reference signals or a DMRS sequence index number, etc.). For example, if the sequence scrambling identifier index of the DMRS is 2 and the other information indicates a numerical bit of 4, the layer number of the current transmission layer may be 8 (i.e., 2 × 4) or the layer number of the current transmission layer may be 6 (i.e., 2+4), and so on. For another example, in another implementation, the layer number of the current transmission layer needs to be represented by n bits, in this embodiment of the application, the sequence scrambling identifier index number of the DMRS may correspond to n1 bits, and the other information corresponds to n2 bits, where n is equal to n1+ n2, and the receiving end device may determine the n bit values corresponding to the layer number according to the specific values of the n1 bits and the n2 bits, so as to determine the layer number.

Therefore, in the embodiment of the present application, the sending end device indicates the sequence scrambling identifier index k of the DMRS of the current transmission layer to indirectly indicate the layer number k of the current transmission layer, and the receiving end device can determine the layer number of the current transmission layer.

Case six:

the indication information is used to indicate sequence scrambling identification indexes of the DMRS of the previous k layers or the previous k-1 layers, and in 320, the receiving end device determines the layer number k of the current transmission layer according to the number of the sequence scrambling identification indexes of the DMRS.

Specifically, the transmitting end device and the receiving end device may locally store sequence scrambling identifiers of a plurality of DMRSs, the transmitting end device may indicate sequence scrambling identifier indexes of the DMRSs of each of the first k or first k-1 transmission layers, and the receiving end device may determine the sequence scrambling identifiers of the DMRSs of the first k or first k-1 transmission layers according to the indicated indexes. It should be understood that, in the case that the transmitting end device indicates the first k-1 sequence scrambling identity indexes, the receiving end device may determine the sequence scrambling identity of the DMRS of the kth transmission layer in other manners. In this case, the receiving end device may determine the layer number k of the current transmission layer according to the number k or k-1 of the sequence scrambling identity indexes of the received DMRSs.

Therefore, in the embodiment of the present application, the layer number k of the current transmission layer is indirectly indicated by the number of the sequence scrambling identification indexes of the DMRS indicated by the sending end device, and the receiving end device can determine the layer number of the current transmission layer.

330, the receiving end device determines the transmission signals of the demodulation reference signals DMRS on the first k transmission layers.

According to the foregoing description, after determining the layer number k of the current transmission layer, the terminal device needs to determine the transmission signal of the DMRS on the k-th transmission layer to determine the power backoff factor λ of the kth transmission layer data according to the transmission signal of the DMRS on the k-th transmission layer_k。

Optionally, in an implementation manner, in 330, the receiving end device determines the transmission signal of the DMRS on the kth transmission layer according to a higher layer signaling and/or a DMRS mapping resource location, and the receiving end device determines the transmission signals of the DMRS on the 1 st to the kth-1 st transmission layers according to a sequence index of the transmission signal of the DMRS indicated by the sending end device;

It should be noted that, the above describes a case where the receiving end device determines the transmission signal of the DMRS on the kth transmission layer according to a higher layer signaling (e.g., Radio Resource Control (RRC)) signaling downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID) and/or DMRS mapping Resource location, alternatively, the receiving end device may also determine the transmission signal of the DMRS on the kth transmission layer according to a sequence index of the transmission signal of the DMRS indicated by the network device.

In other words, the receiving end device may determine the transmission signals of the DMRSs on the 1 st to kth transmission layers according to the sequence indexes of the transmission signals of the DMRSs indicated by the transmitting end device. Specifically, the method of determining the transmission signals of the DMRSs of the 1 st to kth transmission layers is the same as the above-described method of determining the transmission signals of the DMRSs of the 1 st to kth-1 st transmission layers, and a description thereof will not be repeated.

Alternatively, in another implementation manner, in 330, the receiving end device determines the transmission signal of the DMRS on the kth transmission layer according to the higher layer signaling and/or the DMRS mapped resource location, and the receiving end device determines the transmission signal of the DMRS on the 1 st to the kth-1 st transmission layers according to the sequence scrambling identity of the DMRS.

In this implementation manner, the method may further include that the sending end device sends the higher layer signaling and/or position indication information used for indicating the position of the DMRS mapping resource to the receiving end device. Further, the receiving end equipment determines the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers according to the sequence scrambling identifiers of the DMRS.

Alternatively, the receiving end device may also determine the transmission signals of the DMRSs on the first k transmission layers in a unified manner, that is, the receiving end device determines the transmission signals of the DMRSs on the 1 st to kth transmission layers according to the sequence scrambling identifiers of the DMRSs.

Specifically, the receiving end device determines the transmission signal of the DMRS on the 1 st to k-1 th or 1 st to k-th transmission layers in one of the following three ways:

the first method is as follows:

and the receiving end equipment (such as terminal equipment) determines the transmitting signals of the DMRS on the 1 st to the k-1 th or the 1 st to the k-th transmission layers according to the default sequence scrambling identifiers of the DMRS, wherein the signaling of the DMRS scrambling identifiers of all the transmission layers is default.

Specifically, when the DMRS scrambling identity signaling of all transmission layers is default and other signaling indicating that the DMRS scrambling identity signaling of the terminal device currently scheduled together is default is received, the receiving end device (for example, the terminal device) determines the transmission signal of the DMRS on the 1 st to the k-1 th transmission layers or the 1 st to the k-th transmission layers according to the default sequence scrambling identity of the DMRS. The other signaling may be a signaling specially used for displaying and indicating that all DMRS scrambling identifier signaling of the currently scheduled terminal devices are default, or may be a signaling implicitly indicating that all DMRS scrambling identifier signaling of the currently scheduled terminal devices are default. For example, the other signaling may be for indicating: when the terminal devices or transmission layers which are scheduled together currently have nonlinear precoding terminal devices or nonlinear precoding transmission layers, the DMRS sequence scrambling identifications of all the terminal devices or all the transmission layers are configured by default. For another example, when a non-linearly precoded terminal device or a transmission layer exists in the currently scheduled terminal devices or transmission layers, the DMRS sequence scrambling identities of all the terminal devices or all the transmission layers are configured by default, and the other signaling may indicate that a non-linearly precoded terminal device or a non-linearly precoded transmission layer exists in the currently scheduled terminal devices or transmission layers. Specifically, during downlink transmission, the DMRS Scrambling identity signaling may be downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID) signaling, and during uplink transmission, the DMRS Scrambling identity signaling may be uplink DMRS Scrambling identity (UL-DMRS-Scrambling-ID) signaling.

In this implementation manner, the method may further include the transmitting end device transmitting, to the receiving end device, information indicating that the DMRS transmission signals of all transmission layers are the same (e.g., sequence scrambling identifiers of the DMRSs of all transmission layers are the same).

When the DMRS scrambling identifier signaling is lacking, the receiving end device may determine, according to the default DMRS sequence scrambling identifier, the DMRS transmission signals on the first k-1 or the first k transmission layers, for example, the receiving end device determines, according to the default DMRS sequence scrambling identifier and the resource location of each transmission layer in the first k-1 or the first k transmission layers, the DMRS transmission signals on each transmission layer. It should be understood that the sequence scrambling identity of the default DMRS may be a cell identity (cell ID) or other identities, and the embodiment of the present application is not limited thereto.

The second method comprises the following steps:

and the terminal equipment determines the transmitting signals of the DMRS on the 1 st to the k-1 th or the 1 st to the k-th transmission layers according to the sequence scrambling identifiers of the DMRS configured by the DMRS scrambling identifier signaling, wherein the sequence scrambling identifiers of the DMRS corresponding to all the transmission layers are the same.

Specifically, when receiving end equipment receives a DMRS scrambling identifier signaling and receives other signaling indicating that DMRS sequence scrambling identifiers of currently scheduled terminal equipment are all the same, the receiving end equipment (for example, the terminal equipment) determines, according to the DMRS sequence scrambling identifier configured by the DMRS scrambling identifier signaling, transmission signals of DMRSs on transmission layers 1 to k-1 or transmission layers 1 to k. The other signaling may be a signaling specially used for displaying and indicating that DMRS scrambling identifiers of the currently scheduled terminal devices are all the same, or may be a signaling implicitly indicating that DMRS scrambling identifiers of the currently scheduled terminal devices are all the same. For example, when a special scrambling identifier is predefined or specified, all terminal devices consider that the scrambling identifiers of the DMRS sequences of the terminal devices currently scheduled together are the same, for example, all the terminal devices are special scrambling identifiers, and at this time, the other signaling for configuring the special scrambling identifiers may implicitly indicate that the DMRS sequences of the terminal devices currently scheduled together are the same; or, when a current scheduled transmission layer or terminal equipment with non-linear precoding or a transmission layer exists in the terminal equipment is predefined or specified, all the terminal equipment consider that the current scheduled terminal equipment together uses the same DMRS scrambling sequence identifier or DMRS sequence, and the other signaling used for indicating the current scheduled transmission layer or the terminal equipment with non-linear precoding or the transmission layer in the terminal equipment (for example, all the terminal equipment or the transmission layers are non-linear precoding or hybrid precoding) may be used for implicitly indicating that all the terminal equipment use the same DMRS scrambling sequence identifier or DMRS sequence.

In this implementation manner, the method may further include the sending end device sending, to the receiving end device, the DMRS scrambling identity signaling and/or information indicating that the DMRS transmission signals of all transmission layers are the same (e.g., the sequence scrambling identities of the DMRSs of all transmission layers are the same).

Specifically, during downlink transmission, the DMRS Scrambling identity signaling may be downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID) signaling, and during uplink transmission, the DMRS Scrambling identity signaling may be uplink DMRS Scrambling identity (UL-DMRS-Scrambling-ID) signaling.

The receiving end device may determine the transmission signals of the DMRSs on the first k-1 or the first k transmission layers according to the sequence scrambling identifier of the DMRS configured by the DMRS scrambling identifier signaling, for example, the receiving end device determines the transmission signals of the DMRSs on each transmission layer according to the configured sequence scrambling identifier of the DMRS and the resource position of each transmission layer in the first k-1 or the first k transmission layers. It should be understood that the sequence scrambling identity of the configured DMRS may be a cell identity (cell ID) or other identities, and the embodiment of the present application is not limited thereto.

The third method comprises the following steps:

the terminal device determines transmission signals of DMRSs on 1 st to k-1 th or 1 st to k-1 th transmission layers according to Radio Network Temporary Identifiers (RNTIs) which are pre-configured and used as sequence scrambling identifiers of nonlinear precoding, wherein the sequence scrambling identifiers of the DMRSs corresponding to all the transmission layers are the RNTIs.

In this implementation manner, the method may further include that the sending end device sends, to the receiving end device, configuration information for configuring the sequence scrambling identifier of the nonlinear precoding to be the radio network temporary identifier RNTI and/or information indicating that DMRS transmission signals of all transmission layers are the same (for example, the sequence scrambling identifiers of the DMRSs of all transmission layers are the same).

It should be understood that the embodiment of the present application is not limited to pre-configuring the sequence scrambling identity dedicated to the non-linear precoding as the radio network temporary identity RNTI, for example, the transmitting end device and the receiving end device may also pre-define the sequence scrambling identity dedicated to the non-linear precoding as the radio network temporary identity RNTI.

Specifically, the receiving end device may determine the transmission signals of the DMRSs on the first k-1 or k first transmission layers according to a sequence scrambling identity, i.e., RNTI, of a predefined or preconfigured DMRS, for example, the receiving end device determines the transmission signals of the DMRSs on each transmission layer according to the RNTI and resource positions of each transmission layer in the first k-1 or k first transmission layers.

It should be understood that after each transmission layer DMRS sequence (QAM symbol set) is determined, the receiving end device may determine, according to the QAM symbol mapping sequence in the sequence, a transmission signal (i.e., one QAM symbol transmitted on a Resource Element (RE) on each subcarrier) corresponding to each transmission layer DMRS sequence on each subcarrier.

Alternatively, in another implementation manner, in 330, the determining, by the receiving end device, a transmission signal of the DMRS on the first k transmission layers includes:

Specifically, the receiving end device may determine the transmission signal of the DMRS on the kth transport layer according to higher layer signaling (e.g., Radio Resource Control (RRC) signaling downlink DMRS Scrambling identity (DL-DMRS-Scrambling-ID)) and/or DMRS mapping Resource location. The receiving end device may then determine DMRS transmission signals of the first k-1 transmission layers in the following manner.

Alternatively, the receiving end device may also determine the transmission signals of the DMRSs on the first k transmission layers in a unified manner, that is, the receiving end device determines the transmission signals of the DMRSs on the 1 st to kth transmission layers in the following manner.

Specifically, in this embodiment of the present application, a receiving end device may pre-store transmission signal sequences of DMRSs corresponding to a plurality of layer numbers one to one, and the receiving end device uses, from the pre-stored transmission signal sequences of the DMRSs corresponding to layer numbers 1 to k-1, the transmission signal sequences of the DMRSs corresponding to layer numbers 1 to k-1 as transmission signal sequences of the DMRSs corresponding to transmission layers 1 to k-1, respectively, according to a layer number k of a current transmission layer; or, the transmission signal sequences of the DMRSs corresponding to the layer numbers 1 to k are respectively used as the transmission signal sequences of the DMRSs of the transmission layers 1 to k.

340, the receiving end device demodulates the kth transmission layer data according to the transmitting signals of the DMRSs on the first k transmission layers. Specifically, in the embodiment of the present application, the receiving end device obtains the channel parameters between the first k transmission layers and the kth transmission layer according to the transmission signals of the DMRSs on the first k transmission layers, and then can determine the power back-off factor λ of the kth transmission layer data according to the channel parameters between the first k transmission layers and the kth transmission layer_kAnd then realize the demodulation to the k transport layer data.

For example, as an embodiment, in 340, the demodulating, by the receiving end device, the kth transport layer data according to the transmission signal of the DMRS on the first k transport layers includes: the receiving end device may determine the power backoff factor λ of the kth transport layer data according to the transmission signals of the DMRSs on the first k transport layers_kFor example, the receiving end device determines the power backoff factor λ of the kth transmission layer data according to the transmission signal of the DMRS on the first k transmission layers and the reception signal of the DMRS of the kth transmission layer_k(ii) a Then, the receiving end equipment according to the power back-off factor lambda_kAnd demodulating the kth transport layer data.

Specifically, the receiving end device determines the DMRS on the first k transmission layersAfter the signals are transmitted, the power backspacing factor lambda of the kth transmission layer data can be determined according to the transmission signals of the DMRS on the first k transmission layers_kFurther, an equivalent channel of the kth transport layer data can be determined, and demodulation of the kth transport layer data (non-linear precoded data) through the linearly precoded DMRS can be achieved.

Further, as an embodiment, in 340, the receiving end device determines a power backoff factor λ of the kth transmission layer data according to the transmission signals of the DMRSs on the first k transmission layers and the received signal of the DMRS of the kth transmission layer_kThe method comprises the following steps: the receiving terminal equipment determines a channel parameter l between a jth transmission layer and a kth transmission layer in the first k transmission layers according to the transmitting signals of the DMRS on the first k transmission layers and the receiving signals of the DMRS on the kth transmission layer_kjWherein j is an integer greater than or equal to 1 and less than or equal to k;

Specifically, a transmission signal of the DMRS on each transmission layer is transmitted through at least one subcarrier, wherein a channel parameter l between a jth transmission layer and a kth transmission layer_kjIncluding channel parameter/of each of at least one subcarrier carrying DMRS of jth transmission layer_kj(i)Wherein i represents the number of subcarriers carrying the DMRS of the j-th transmission layer.

Further, in 340, the receiving end device determines a channel parameter l between a jth transmission layer and a kth transmission layer in the first k transmission layers according to the transmission signal of the DMRS on the first k transmission layers and the receiving signal of the kth transmission layer_kjThe method comprises the following steps:

the receiving terminal equipment determines a channel parameter l according to a DMRS receiving signal on the ith subcarrier corresponding to the kth transmission layer and a DMRS transmitting signal on the ith subcarrier of the jth transmission layer_kj(i)。

It should be understood that DMR is based on the transport layerThe different S resource mapping modes or frequency domain positions determine the channel parameter l in the embodiment of the application_kj(i)May also differ, two determinations of l are described below_kj(i)The scheme (2).

The first scheme is as follows:

the receiving terminal equipment determines a channel parameter l according to a DMRS receiving signal on the ith subcarrier corresponding to the kth transmission layer and a DMRS transmitting signal on the ith subcarrier of the jth transmission layer_kj(i)Comprising the receiving end equipment determining a channel parameter l according to the following formula (4)_kj(i)：

y_dmrs,kj(i)＝l_kj(i)s_j(i)+n_k(i) (4)

Wherein, y_dmrs,kj(i)Indicating a received signal on an ith subcarrier corresponding to a transmitted signal of a j-th layer DMRS received on a k-th transmission layer, wherein when j is less than k, y_dmrs,kj(i)Representing the interference of the j-th layer on the ith subcarrier corresponding to the k-th layer received signal; when j is equal to k, y_dmrs,kj(i)Indicating that the transmitted signal of the kth layer on the ith subcarrier corresponds to the received signal on the ith subcarrier; s_j(i)A transmission signal representing the DMRS of the jth transmission layer on the ith subcarrier, n_k(i)Representing the noise received by the kth transmission layer on the ith subcarrier.

Specifically, when the DMRS signals of all transmission layers are frequency-shared, i.e., DMRS signals of different transmission layers are mapped on different subcarriers. The receiving end device may determine l according to the above equation (4)_kj(i)。

For example, as shown in fig. 4, it is assumed that there are four transmission layers, i.e., transmission layer 1 to transmission layer 4, where each transmission layer corresponds to one port, transmission layer 1 is mapped on

subcarriers

1, 5, 9, transmission layer 2 is mapped on

subcarriers

2, 6, 10, transmission layer 3 is mapped on

subcarriers

3, 7, 11, and transmission layer 4 is mapped on

subcarriers

4, 8, 12.

i denotes the number of one subcarrier in a group of subcarriers corresponding to one transport layer, and i is taken as the number of this group of subcarriers, for example, j is 1, i is 1, 5 or 9 for transport layer 1.

Specifically, the form of the signal S sent by the sending end device is as follows, where each row in the matrix S corresponds to the transmission signal of each transmission layer, for example, the first row to the fourth row respectively correspond to the transmission signals of the DMRSs of the transmission layers 1 to 4; each column in the matrix S corresponds to a subcarrier, for example, the 1 st column to the 12 th column respectively correspond to subcarriers 1 to 12. Element S of jth row and ith column in matrix S_j(i)And a transmission signal of the DMRS of the transmission layer j on the ith subcarrier.

S is a signal y received by the receiving end corresponding to the formula (4) after being transmitted through the channel_dmrsIs of the form shown below, wherein the matrix y_dmrsEach row corresponds to a received signal of each transmission layer, for example, the first row to the fourth row respectively correspond to received signals of DMRSs of transmission layers 1 to 4; matrix y_dmrsEach column corresponds to a subcarrier, for example, columns 1 to 12 correspond to subcarriers 1 to 12, respectively. Matrix y_dmrsEach element in (e.g., the x row and y column elements) represents the received signal of the x layer signal on the y subcarrier.

The receiving end equipment is based on the matrix S and the matrix y_dmrsThe channel parameter/can be determined_kj(i)。

It should be understood that the example in fig. 4 shows the case where each transmission layer is mapped to non-adjacent subcarriers in the frequency division scenario, and optionally, each transmission layer may also be mapped to multiple adjacent subcarriers in the frequency division scenario. For example, each transport layer is mapped onto two consecutive subcarriers. Assuming that there are N transmission layers, N ports, one port for each transmission layer, and each transmission layer is mapped to 2 consecutive subcarriers, there are 2N subcarriers, where transmission layer 1 is mapped to subcarrier 1 and subcarrier 2, and transmission layer 2 is mapped to subcarrier 3 and subcarrier 4 …, and transmission layer N is mapped to subcarrier 2N-1 and subcarrier 2N.

For example, as shown in fig. 5, an example where N is 6 is shown, specifically, the form of the signal S sent by the sending end device is as follows, where each row in the matrix S corresponds to the transmission signal of each transmission layer, for example, the first to sixth rows correspond to the transmission signals of the DMRSs of the transmission layers 1 to 6, respectively; each column in the matrix S corresponds to a subcarrier, for example, the 1 st column to the 12 th column respectively correspond to subcarriers 1 to 12. Element S of jth row and ith column in matrix S_j(i)And a transmission signal of the DMRS of the transmission layer j on the ith subcarrier.

S is a signal y received by the receiving end corresponding to the formula (4) after being transmitted through the channel_dmrsIs of the form shown below, wherein the matrix y_dmrsEach row corresponds to a received signal of each transmission layer, for example, the first to sixth rows respectively correspond to received signals of DMRSs of transmission layers 1 to 6; matrix y_dmrsEach column corresponds to a subcarrier, for example, columns 1 to 12 correspond to subcarriers 1 to 12, respectively. Matrix y_dmrsEach element in (e.g., the x row and y column elements) represents the received signal of the x layer signal on the y subcarrier.

Fig. 4 and fig. 5 only show two forms of resource mapping manners, but the embodiment of the present application is not limited thereto, and those skilled in the art may make corresponding modifications, for example, in a frequency division scenario, each transmission layer may also map to three consecutive subcarriers; or each transmission layer is mapped to four subcarriers, wherein the first two subcarriers in the four subcarriers are adjacent, the last two subcarriers are adjacent, and the middle two subcarriers are not adjacent.

It should also be understood that, in the examples of fig. 4 and fig. 5, the DMRS is mapped on all subcarriers on the third OFDM symbol, that is, on the subcarriers 1 to 12 on the third OFDM symbol, alternatively, the DMRS may be mapped on only a part of subcarriers on the OFDM symbol, and the remaining subcarriers on the OFDM symbol except the part of subcarriers may or may not map data (for example, data in the PDSCH or PUSCH), and the embodiments of the present application are not limited thereto.

It should be further understood that, in the examples of fig. 4 and fig. 5, only one OFDM symbol is occupied by the DMRS, and optionally, the DMRS may occupy multiple OFDM symbols, where the multiple OFDM symbols may be adjacent symbols or non-adjacent symbols, and the embodiments of the present application are not limited thereto.

Scheme II:

in the above scheme i, a scheme of performing mapping in a transmission layer frequency division manner is described, alternatively, in the scheme ii, the embodiment of the present application may perform mapping in a code division manner.

For example, in the embodiment of the present application, every two transmission layers are regarded as a group, and the group of transmission layers is simultaneously mapped onto two consecutive subcarriers, and the two transmission layers have a code division and a frequency division between different groups.

For example, if the number of the shared transmission layers is N, the number of ports is N, and the number of subcarriers is also N, the form of the signal S sent by the sending end device is as follows, where each row in the matrix S corresponds to the transmission signal of each transmission layer, for example, the first row to the nth row respectively correspond to the transmission signals of the DMRSs of the transmission layers 1 to N; each column in the matrix S corresponds to a subcarrier, for example, the 1 st column to the nth column respectively correspond to subcarriers 1 to N. Element S of jth row and ith column in matrix S_j(i)And a transmission signal of the DMRS of the transmission layer j on the ith subcarrier.

After S is transmitted through a channel, a signal y received by a receiving end_dmrsIs of the form shown below, wherein the matrix y_dmrsEach row corresponds to a received signal of each transmission layer, for example, the first row to the nth row respectively correspond to received signals of DMRSs of transmission layers 1 to N; matrix y_dmrsEach column corresponds to a subcarrier, for example, the 1 st column to the nth column correspond to subcarriers 1 to N, respectively. Matrix y_dmrsEach element in (e.g., the x row and y column elements) represents the received signal of the x layer signal on the y subcarrier.

It is assumed that the transmission signals of the 2m-1 th port and the 2m th port of one code packet on the odd-numbered subcarriers are the same, and the transmission signals on the even-numbered subcarriers are opposite.

Namely: s_2m-1,(2m-1)＝s_2m(2m-1),s_2m-1,(2m)＝-s_2m,(2m)Wherein the value of m is 1 to N/2.

The signal y received by the receiving end_dmrsThe form of (a) is modified as follows,

because two subcarriers of the code division are adjacent and the channel variation is not large, the embodiment of the application can assume the channel parameter l corresponding to the two subcarriers of the code grouping_kj(2m-1)And l_kj(2m)Are equal. The receiving end device then processes the matrix S and the matrix y_dmrsThe channel parameter/can be determined_kj(i)。

It should be understood that, in the second scheme, a form of a resource mapping manner in which two subcarriers are used as one subcarrier group to perform a code division manner is given, but the embodiment of the present application is not limited thereto, and those skilled in the art may perform corresponding modifications. For example, more subcarriers are code-divided as one subcarrier group, and each transmission layer may be mapped onto multiple subcarrier groups.

After determining the channel parameter l_k1(i)To the channel parameter l_kk(i)Then, the receiving end device may determine a backoff factor λ representing the ith subcarrier corresponding to the kth transmission layer according to the following formula (5)_k(i)。

It should be understood that, in the embodiment of the present application, the DMRS signal of each transmission layer is mapped to only a part of subcarriers, and only part/can be obtained according to the scheme described above_kj(i)Wherein for the remaining l in the layer_kj(i)Can be based on the moiety l_kj(i)Obtaining, for example, can be based on l that has been obtained_kj(i)The average value, the median value, the weighted sum, the interpolation method, the filtering method, the extrapolation method, and the like are used to obtain the average value, the median value, the weighted sum, the interpolation method, the filtering method, the extrapolation method, and the like, and the embodiments of the present application are not limited thereto.

For example, for the example of fig. 4 in the first scheme, the DMRS of one transmission layer is mapped to only 3 subcarriers, e.g., j equals 1, i.e., for transmission layer 1, i takes a value of 1, 5, or 9. That is, l can be obtained according to the scheme described above_k1(1)、l_k1(5)And l_k1(9)And the rest of l_k1(i)E.g. l_k1(2)、l_k1(3)、l_k1(4)、l_k1(6)…, according to l_k1(1)、l_k1(5)And l_k1(9)The method is obtained by adopting an average value, a median value, a weighted sum, an interpolation method, a filtering method or an extrapolation method and the like.

At the moment of determining lambda_k(i)Then, the receiving end device may set the equivalent channel according to the kth transport layer data to be l_kk(i)λ_k(i)And demodulating the kth transport layer data.

For example, the receiving end device may demodulate data of the kth transmission layer (e.g., data carried by PDSCH or PUSCH) according to the following equation (6).

y_k(i)＝l_kk(i)λ_k(i)a_k(i)+n_k(i) (6)

Wherein i is an integer greater than or equal to 1 and less than or equal to N, i represents the number of the subcarriers, and N represents the total number of the subcarriers; y is_k(i)Represents the received signal (or, y) of the kth transport layer data on the ith subcarrier_k(i)A received signal corresponding to the kth transport layer data received on the ith subcarrier); l_kk(i)A channel representing the ith subcarrier corresponding to the kth transmission layer; lambda [ alpha ]_k(i)Representing a power backoff factor of a kth transmission layer at an ith subcarrier; a is_k(i)Representing an original transmission signal (e.g., a Quadrature Amplitude Modulation (QAM) signal) of a kth transmission layer on an ith subcarrier; n is_k(i)Representing the noise on the ith subcarrier.

Therefore, in the embodiment of the present application, under the condition that the DMRS employs linear precoding and the data employs nonlinear precoding, the indication information of the transmitting end device can enable the receiving end device to estimate the effective channel of the data according to the DMRS to demodulate the data, thereby solving the problem that the effective channel of the data cannot be estimated and the data cannot be demodulated directly according to the DMRS receiving signal in the prior art.

It should be understood that the embodiment shown in fig. 3 describes a scheme in which each transmission layer is mapped on at least one subcarrier and, for each transmitted subcarrier, data on the subcarrier is demodulated according to the DMRS transmitted on the respective subcarrier.

Optionally, in this embodiment of the present application, each transmission layer may also be regarded as a whole without distinguishing that one transmission layer is mapped to specific subcarriers, and the formula in the embodiment of fig. 3 may be backed off, that is, the subcarrier footer may be removed from each formula and matrix in fig. 3 (this case may also be regarded as a case where one layer is mapped to one subcarrier correspondingly).

Specifically, the method comprises the following steps: the above step 340 may be replaced by the following steps: the receiving end equipment transmits the data according to each of the first k transmission layersInterference parameter l of transmission signal of DMRS on transmission layer to k transmission layer_kjDetermining a power backoff factor λ for the kth transport layer data_kThe method comprises the following steps:

the receiving end equipment determines the lambda according to a formula (3)_k：

Wherein the receiving end device may determine the channel parameter l between the jth transmission layer and the kth transmission layer in the first k transmission layers according to the transmission signal of the DMRS on the first k transmission layers and the reception signal of the kth transmission layer_kj. Specifically, the receiving end device determines a subchannel parameter l according to formula (2)_kj：

y_dmrs,kj＝l_kjs_j+n_k (2)

Wherein, y_dmrs,kjDenotes a DMRS signal received on the kth transmission layer, j ═ 1,2_jA transmission signal representing the DMRS of the j-th transmission layer, n_kRepresenting the noise corresponding to the k-th transport layer.

For example, when DMRS signals of all layers are frequency-shared: that is, DMRS signals of all layers are mapped on a set of subcarriers, the DMRS signals with inputs are as follows:

wherein s in the above formula (2)_jCan take the value of s₁₁To s_NNOriginal QAM symbols of DMRS signals transmitted on 1 st to nth transmission layers may be represented, respectively. At this time, after passing through the linear precoding matrix F and the channel H, the received signal y is obtained_dmrsIn the form:

according to the formula (2), the receiving end device is based on the matrix S and the matrix y_dmrsThe channel parameter/can be determined_kj. And then the receiving end equipment can determine the power back-off factor lambda according to the formula (3)_kAnd demodulating the data.

For example, the receiving end device may demodulate data of the kth transmission layer (e.g., data carried by PDSCH or PUSCH) according to equation (1).

y_k＝l_kkλ_ka_k+n_k (1)

Wherein, y_kA received signal representing kth transport layer data; l_kkRepresenting a channel corresponding to a k-th transmission layer; lambda [ alpha ]_kRepresenting a power back-off factor corresponding to a k transmission layer; a is_kRepresenting the original transmit signal (e.g., a Quadrature Amplitude Modulation (QAM) signal) on the kth transport layer; n is_kRepresenting the noise corresponding to the k-th transport layer.

Specifically, in the method shown in fig. 3, the receiving end device (e.g., terminal device) is required to determine the power backoff factor λ itself_kAlternatively, in this embodiment of the application, the sending end device (e.g., the network device) may also indicate the power backoff factor λ to the receiving end device_kAnd then the receiving end equipment returns the factor lambda of the power according to the instruction of the sending end equipment_kAnd the demodulation of the data is realized. As described in detail below in conjunction with fig. 6.

Fig. 6 is a schematic diagram of a method for data demodulation according to another embodiment of the present application. The method shown in fig. 6 is described from the perspective of a network device interacting with a terminal device. The method shown in fig. 6 can be applied to downlink transmission and also can be applied to uplink transmission, where in the downlink transmission, the sending end device is a network device, and the receiving end device is a terminal device; in uplink transmission, the sending end device is a terminal device, and the receiving end device is a network device. The following is only described in detail by taking downlink transmission as an example, and the process of uplink transmission may refer to the description of downlink transmission herein. Specifically, the method 600 as shown in fig. 6 includes:

610, the transmitting end device determines a power back-off factor lambda of the data_k。

Specifically, the sending end device determines λ according to the acquired downlink channel, such as a channel estimated through SRS, or a channel fed back by the terminal device_k。

620, the sending end device sends indication information to the receiving end device, the indication information is used for indicating the power back-off factor λ_k。

Correspondingly, the receiving end equipment receives the indication information and determines the power back-off factor lambda_k。

For example, the indication information may be indicated by the sending end device through RRC signaling, DCI, or MAC signaling, and optionally, when the channel changes faster, the indication information may be indicated by DCI; alternatively, when the channel change is slow, the indication information may be indicated by MAC signaling or RRC signaling, and the embodiment of the present application is not limited thereto.

630, the receiving end device according to the power back-off factor lambda_kAnd demodulating the kth transport layer data.

Specifically, the power back-off factor lambda is determined_kIn this case, the specific process of demodulating data by the receiving end device may refer to the description of fig. 3 above, and is not described herein again.

Therefore, in the embodiment of the present application, when the DMRS uses linear precoding and the data uses nonlinear precoding, the sending end device indicates the power backoff factor λ_kThe method and the device can realize that the receiving end equipment estimates the effective channel of the data according to the DMRS to realize the demodulation of the data, and solve the problem that the effective channel of the data cannot be estimated and the data cannot be demodulated directly according to the DMRS receiving signal in the prior art.

It should be noted that, in the foregoing, it is described that since the DMRS employs the linear precoding scheme and the data employs the non-linear precoding scheme, equivalent channels of the DMRS and the data are different. And therefore, the receiving end equipment cannot demodulate data according to the DMRS.

In the embodiment of the present application, the difference between the two equivalent channels may also be compensated at the sending end device, so that the equivalent channels of the two are the same, and then the receiving end device can demodulate data according to the DMRS. This scheme is described in detail below in conjunction with fig. 7.

Fig. 7 is a schematic diagram of a method for data demodulation according to another embodiment of the present application. The method shown in fig. 7 is described from the perspective of a network device interacting with a terminal device. The method shown in fig. 7 can be applied to downlink transmission and also can be applied to uplink transmission, where in the downlink transmission, the sending end device is a network device, and the receiving end device is a terminal device; in uplink transmission, the sending end device is a terminal device, and the receiving end device is a network device. The following is only described in detail by taking downlink transmission as an example, and the process of uplink transmission may refer to the description of downlink transmission herein. Specifically, the method 700 as shown in fig. 7 includes:

and 710, the transmitting end equipment transmits the power-adjusted DMRS signal.

Specifically, when the sending end device sends the DMRS signal, power adjustment is performed, so that an equivalent channel of the DMRS is the same as or similar to an equivalent channel of the data.

Specifically, the sending end device first determines a power adjustment parameter, then performs power adjustment on the DMRS signal, and sends the DMRS signal after power adjustment.

For example, the power adjustment parameter is α λ k, and the power-adjusted DMRS signal may be a signal obtained by pre-multiplying the DMRS signal of the kth layer by a power backoff factor α λ k of the DMRS by the sending end device, where λ k is a power backoff factor of the kth transport layer data, α is a coefficient (which may also be referred to as a power backoff factor coefficient) indicating that the DMRS power backoff factor is α times the data power backoff factor, and the default is 1, and values of α may be the same or different between different layers or different UEs. Optionally, the value set of α may be predefined or preconfigured or predefined.

720, the sending end device sends indication information to the receiving end device, and the indication information is used for indicating alpha. When there is no instruction information, both the transmitting and receiving ends set a default value of 1 for α.

And 730, the receiving end equipment demodulates the kth transmission layer data according to the power compensation factor.

Specifically, the receiving end device estimates an effective channel, for example, l, of data obtained from the transmission signal (i.e., the power-adjusted DMRS signal) of the DMRS of the current layer, the reception signal, and α_kk(i)λ_k(i)And further, demodulation of data can be achieved through the DMRS. Due to lambda_kCan be any value, informing the exact lambda_kA large signaling overhead is required if for λ_kQuantization re-notification can reduce overhead, but accuracy is again degraded. Compared with the method of the embodiment of the application, the method directly informs the lambda_kIn other words, the accuracy of the effective channel can be ensured while the signaling overhead can be reduced.

Therefore, in the embodiment of the application, the difference between the DMRS and the equivalent channel of the data is compensated at the sending end device, so that the equivalent channels of the DMRS and the data are the same, and the receiving end device can estimate the effective channel of the data according to the DMRS to demodulate the data, thereby solving the problem that the effective channel of the data cannot be estimated and the data cannot be demodulated directly according to the DMRS receiving signal in the prior art.

It is clearly understood by those skilled in the art that the various numbers such as "first", "second", etc. are used for descriptive convenience only and are not intended to limit the embodiments of the present application.

It should be understood that the above examples of fig. 3 to 7 are only for assisting the skilled person in understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention to the specific values or specific scenarios illustrated. It will be apparent to those skilled in the art that various equivalent modifications or variations are possible in light of the examples given in figures 3 through 7, and such modifications or variations are intended to be included within the scope of embodiments of the present invention.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method according to the embodiment of the present invention is described in detail in conjunction with fig. 1 to 7, and the communication apparatus according to the embodiment of the present invention is described in conjunction with fig. 8 to 11.

Fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the communication device 800 may include:

a processing unit 810 and a transceiving unit 820.

Specifically, the transceiver unit is configured to receive indication information sent by sending end equipment; the processing unit is used for determining the layer number k of the current transmission layer according to the indication information, wherein k is an integer greater than or equal to 1; determining transmission signals of demodulation reference signals (DMRS) on the first k transmission layers; and demodulating the kth transmission layer data according to the transmitting signals of the DMRS on the first k transmission layers.

Optionally, the processing unit is specifically configured to determine a power backoff factor λ of a kth transmission layer data according to the transmission signal of the DMRS on the first k transmission layers and the reception signal of the DMRS of the kth transmission layer_k；

According to the power back-off factor lambda_kAnd demodulating the kth transport layer data.

Optionally, the processing unit is specifically configured to determine, according to the transmission signal of the DMRS on the first k transmission layers and the reception signal of the DMRS of the kth transmission layer, a channel parameter l between the jth transmission layer and the kth transmission layer in the first k transmission layers_kjWherein j is an integer greater than or equal to 1 and less than or equal to k;

according to the channel parameter l between the jth transmission layer and the kth transmission layer in the first k transmission layers_kjDetermining a power backoff factor λ for the kth transport layer data_k。

Optionally, the transmission signal of DMRS on each transmission layer is transmitted through at least one subcarrier, wherein a channel parameter l between a jth transmission layer and the kth transmission layer_kjIncluding channel parameter/of each of at least one subcarrier carrying DMRS of jth transmission layer_kj(i)Wherein i represents the number of subcarriers carrying the DMRS of the j transmission layer;

the processing unit is specifically configured to perform a processing operation on the ith subcarrier according to a corresponding signal on a kth transmission layerThe DMRS receiving signal of the jth transmission layer and the transmitting signal of the DMRS of the jth transmission layer on the ith subcarrier determine a channel parameter l_kj(i)。

Optionally, the indication information is used to indicate a DMRS port number k of a current transport layer, where the DMRS port number and a layer number of the transport layer have a one-to-one correspondence, and the processing unit is specifically configured to determine the DMRS port number k as the layer number k of the current transport layer;

the indication information is used for indicating a sequence index k of a transmission signal of a DMRS (demodulation reference signal) of a current transmission layer, wherein the index of the sequence of the transmission signal of the DMRS has a one-to-one correspondence relationship with a layer number of the transmission layer, and the processing unit is specifically used for determining the sequence index k of the transmission signal of the DMRS as the layer number k of the current transmission layer;

the indication information is used for indicating sequence indexes of transmission signals of a front k-layer DMRS, and the processing unit is specifically used for determining the layer number k of the current transmission layer according to the number of the sequence indexes of the transmission signals of the DMRS;

the indication information is used for indicating sequence scrambling identifiers of the DMRS of the previous k layers, and the processing unit is specifically used for determining the layer number k of the current transmission layer according to the number of the sequence scrambling identifiers of the DMRS;

the indication information is used for indicating a sequence scrambling identification index k of the DMRS of the current transmission layer, wherein the sequence scrambling identification index k of the DMRS has a one-to-one correspondence relationship with the layer number of the transmission layer, and the processing unit is specifically used for determining the sequence scrambling identification index k of the DMRS as the layer number k of the current transmission layer;

the indication information is used for indicating sequence scrambling identification indexes of a front k-layer DMRS, and the processing unit is specifically used for determining the layer number k of the current transmission layer according to the number of the sequence scrambling identification indexes of the DMRS; or

The indication information is used for indicating the layer number k of the current transmission layer.

Optionally, the processing unit is specifically configured to determine, according to a higher layer signaling and/or a DMRS mapping resource location, a transmission signal of a DMRS on a kth transmission layer, and determine, according to a sequence index of the transmission signal of the DMRS indicated by the sending end device, transmission signals of DMRS on 1 st to kth-1 th transmission layers;

the processing unit is specifically configured to determine a transmission signal of the DMRS on the kth transmission layer according to the high-layer signaling and/or the DMRS mapping resource location, and determine transmission signals of the DMRSs on the 1 st to the kth-1 st transmission layers according to the sequence scrambling identifiers of the DMRSs; alternatively, the first and second electrodes may be,

the processing unit is specifically configured to determine, according to a high-level signaling and/or a DMRS mapping resource location, a transmission signal of a DMRS on a kth transmission layer, and determine, according to a layer number of a current transmission layer, transmission signals of DMRS on 1 st to kth-1 st transmission layers, where the transmission signals of the DMRS corresponding to the transmission layers correspond to the layer numbers of the transmission layers one to one.

Optionally, the processing unit is specifically configured to determine, according to sequence indexes of DMRS transmission signals on 1 st to k-1 th transmission layers indicated by the sending end device, DMRS transmission signals on 1 st to k-1 th transmission layers from a preset DMRS sequence set, where the DMRS sequence set includes one or more DMRS sequences specially defined for non-linear precoding.

Optionally, the processing unit is specifically configured to determine the transmission signal of the DMRS on the 1 st to k-1 th transmission layers in one of the following three manners:

when the signaling of the DMRS scrambling identifiers of all the transmission layers is lacked, determining the transmission signals of the DMRS on the 1 st to the (k-1) th transmission layers according to the default sequence scrambling identifiers of the DMRS,

determining the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers according to the sequence scrambling identifiers of the DMRS configured by the DMRS scrambling identifier signaling, wherein the sequence scrambling identifiers of the DMRS corresponding to all the transmission layers are the same;

determining the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers according to a Radio Network Temporary Identifier (RNTI) which is pre-configured and used as a sequence scrambling identifier of the nonlinear precoding, wherein the sequence scrambling identifiers of the DMRS corresponding to all the transmission layers are the RNTI.

The communication apparatus 800 provided in this application corresponds to the process executed by the receiving end device in the embodiment of the method in fig. 3, and the functions of each unit/module in the communication apparatus may refer to the description of the embodiment of the method in fig. 3, which is not described herein again.

Optionally, the communication apparatus 800 in this embodiment may also correspond to the process executed by the receiving end device in fig. 6 to fig. 7, and the functions of each unit/module in the communication apparatus may refer to the description of the method embodiment in fig. 6 to fig. 7, which is not described herein again.

It should be understood that the communication apparatus shown in fig. 8 may be a receiving end device, for example, the receiving end device is a terminal device in downlink transmission, and the receiving end device is a network device in uplink transmission, and the following describes specific columns of the communication apparatus by taking downlink transmission as an example. Specifically, the communication device may be a terminal device, or may be a chip or an integrated circuit mounted in the terminal device.

Taking a communication device as an example of a terminal device, fig. 9 is a schematic structural diagram of the terminal device provided in the embodiment of the present application, which is convenient for understanding and illustration, and in fig. 9, the terminal device takes a mobile phone as an example. Fig. 9 shows only the main components of the terminal device. The terminal apparatus 900 shown in fig. 9 includes a processor, a memory, a control circuit, an antenna, and an input-output device. The processor is mainly configured to process the communication protocol and the communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiments. The memory is used primarily for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 9 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal device, execute a software program, and process data of the software program. The processor in fig. 9 may integrate the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

In the embodiment of the present invention, the antenna and the control circuit having the transceiving function may be regarded as the transceiving unit 91 of the terminal device 900, for example, for supporting the terminal device to perform the transceiving function as performed by the terminal device in fig. 8. A processor having a processing function is considered as the processing unit 92 of the terminal device 900, which corresponds to the processing unit 810 in fig. 8, for example, for performing demodulation of data. As shown in fig. 9, the terminal apparatus 900 includes a transceiving unit 91 and a processing unit 92. The transmitting/receiving unit may also be referred to as a transceiver, a transmitting/receiving device, or the like, and corresponds to the transmitting/receiving unit 820 in fig. 8, for example, to receive instruction information transmitted by the transmitting-end apparatus. Alternatively, a device for implementing a receiving function in the transceiver unit 91 may be regarded as a receiving unit, and a device for implementing a sending function in the transceiver unit 91 may be regarded as a sending unit, that is, the transceiver unit 91 includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, and the like, and the sending unit may be referred to as a transmitter, a sending circuit, and the like.

The processing unit 92 may be configured to execute the instructions stored in the memory, so as to control the transceiver unit 91 to receive and/or transmit signals, thereby implementing the functions of the terminal device in the above method embodiments. As an implementation manner, the function of the transceiving unit 91 may be considered to be implemented by a transceiving circuit or a dedicated chip for transceiving.

It should be understood that terminal device 900 shown in fig. 9 is capable of implementing various processes involving the terminal device in the method embodiment of fig. 3-7. The operations and/or functions of the respective modules in the terminal device 900 are respectively for implementing the corresponding flows in the above-described method embodiments. Specifically, reference may be made to the description of the above method embodiments, and the detailed description is appropriately omitted herein to avoid redundancy.

Fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the device 1000 may include:

a processing unit 1010 and a transceiver unit 1020.

Specifically, the processing unit is configured to generate indication information, where the indication information is used to determine a layer number k of a current transport layer, and k is an integer greater than or equal to 1;

and the receiving and sending unit is used for sending indication information to receiving end equipment so that the receiving end equipment determines the layer number k of the current transmission layer according to the indication information and demodulates the data of the kth transmission layer according to the transmitting signals of the DMRS on the first k transmission layers.

Alternatively,

the indication information is used for indicating the DMRS port number k of the current transmission layer;

the indication information is used for indicating a sequence index k of a transmitting signal of the DMRS of the current transmission layer;

the indication information is used for indicating the sequence index of a transmitting signal of the front k-layer DMRS;

the indication information is used for indicating a sequence scrambling identifier of the DMRS of the front k layers;

the indication information is used for indicating a sequence scrambling identification index k of the DMRS of the current transmission layer;

the indication information is used for indicating a sequence scrambling identification index of the front k layers of DMRS; or

Optionally, the transceiver unit is further configured to send at least one of the following information to the receiving end device:

DMRS maps resource location information;

the sequence scrambling identifier used for configuring the nonlinear precoding is configuration information of a Radio Network Temporary Identifier (RNTI);

sequence index information of transmission signals of DMRSs on 1 st to k-1 th transmission layers;

DMRS scrambling identification signaling of all transmission layers;

information indicating that DMRS transmission signals of all transmission layers are the same;

and information indicating a one-to-one correspondence relationship between the transmission signal of the DMRS and the layer number of the transmission layer.

The communication apparatus provided in this application is a process executed by the sending end device in the method embodiments corresponding to fig. 3 to fig. 7, and the functions of each unit/module in the communication apparatus may refer to the description above, which is not described herein again.

It should be understood that the communication apparatus illustrated in fig. 10 may be a sending end device, and in uplink transmission, the sending end device may be a terminal device, and in downlink transmission, the sending end device may be a network device, and in the following, specific columns of the communication apparatus are described by taking downlink transmission as an example. Specifically, the communication device may be a network device, or may be a chip or an integrated circuit installed in the network device.

Taking a communication device as an example of a network device, fig. 11 is a schematic structural diagram of a network device provided in an embodiment of the present application, which may be, for example, a schematic structural diagram of a base station. As shown in fig. 11, the network device 1100 may be applied to the system shown in fig. 1, and performs the functions of the network device in the above method embodiments.

The network device 1100 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 111 and one or more baseband units (BBUs) (also referred to as digital units, DUs) 112. The RRU111 may be referred to as a transceiver unit 111, which corresponds to the transceiver unit 1020 in fig. 10, and may also be referred to as a transceiver, a transceiver circuit, or a transceiver, which may include at least one antenna 1111 and a radio frequency unit 1112. The RRU111 is mainly used for transceiving radio frequency signals and converting the radio frequency signals and baseband signals, for example, for sending indication information to a terminal device. The BBU112 part is mainly used for performing baseband processing, controlling a base station, and the like. The RRU111 and the BBU112 may be physically disposed together or may be physically disposed separately, i.e., distributed base stations.

The BBU112 is a control center of the base station, and may also be referred to as a processing unit 112, and may correspond to the processing unit 1010 in fig. 10, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulating, spreading, and the like. For example, the BBU (processing unit) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU112 may be formed by one or more boards, and the boards may support a radio access network of a single access system (e.g., an LTE network) together, or may support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks) respectively. The BBU112 also includes a memory 1121 and a processor 1122. The memory 1121 is used for storing necessary instructions and data. The processor 1122 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedure related to the network device in the above method embodiment. The memory 1121 and processor 1122 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the network device 1100 shown in fig. 11 is capable of implementing various processes involving network devices in the method embodiments of fig. 3-7. The operations and/or functions of the respective modules in the network device 1100 are respectively for implementing the corresponding flows in the above-described method embodiments. Specifically, reference may be made to the description of the above method embodiments, and the detailed description is appropriately omitted herein to avoid redundancy.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method of communication in any of the above method embodiments.

It should be understood that the processing means may be a chip. For example, the processing Device may be a Field-Programmable Gate Array (FPGA), an Application-Specific Integrated Circuit (ASIC), a System on Chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal processing Circuit (DSP), a Microcontroller (MCU), a Programmable Logic Device (PLD), or other Integrated chips.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present invention may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in embodiments of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the present application further provides a communication system, which includes the foregoing sending end device and receiving end device. For example, the sending end device is a network device, and the receiving end device is a terminal device; or, the sending end device is a terminal device, and the receiving end device is a network device.

The present application further provides a computer-readable medium, on which a computer program is stored, where the computer program is executed by a computer to implement the method for demodulating data in any of the above method embodiments.

The embodiment of the present application further provides a computer program product, and when executed by a computer, the computer program product implements the method for demodulating data in any of the above method embodiments.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. 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 a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

It should be understood that the above describes a method for communication during downlink transmission in a communication system, but the present application is not limited thereto, and optionally, a similar scheme as above may also be adopted during uplink transmission, and details are not described here again to avoid repetition.

The network device in the foregoing various apparatus embodiments completely corresponds to the terminal device and the network device or the terminal device in the method embodiments, and the corresponding modules or units execute the corresponding steps, for example, the sending module (transmitter) method executes the steps sent in the method embodiments, the receiving module (receiver) executes the steps received in the method embodiments, and other steps except sending and receiving may be executed by the processing module (processor). The functionality of the specific modules may be referred to in the respective method embodiments. The transmitting module and the receiving module can form a transceiving module, and the transmitter and the receiver can form a transceiver to realize transceiving function together; the processor may be one or more.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning 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, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

It should also be understood that reference herein to first, second, third, fourth, and various numerical designations is made only for ease of description and is not intended to limit the scope of the embodiments of the present application.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). The procedures or functions described in accordance with the embodiments of the present application are generated in whole or in part when the computer program instructions (programs) are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (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 a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for demodulating data, comprising:

receiving end equipment receives indication information sent by sending end equipment;

the receiving end equipment demodulates the data of the kth transmission layer according to the transmitting signals of the DMRS on the first k transmission layers;

the receiving end device demodulates the kth transmission layer data according to the transmitting signals of the DMRS on the first k transmission layers, and the demodulation comprises the following steps:

2. The method of claim 1,

the receiving terminal equipment determines a power backspacing factor lambda of the kth transmission layer data according to the transmitting signals of the DMRS on the first k transmission layers and the receiving signals of the DMRS on the kth transmission layer_kThe method comprises the following steps:

3. The method according to claim 1 or 2,

the indicating information is used for indicating the DMRS port number k of the current transmission layer, wherein the DMRS port number and the layer number of the transmission layer have a one-to-one correspondence relationship, and the receiving terminal equipment determines the layer number k of the current transmission layer according to the indicating information, and the method comprises the following steps: the receiving terminal equipment determines the DMRS port number k as the layer number k of the current transmission layer;

the indicating information is used for indicating a sequence index k of a transmission signal of a DMRS of a current transmission layer, where the index of the sequence of the transmission signal of the DMRS and the layer number of the transmission layer have a one-to-one correspondence, and the receiving end device determines the layer number k of the current transmission layer according to the indicating information, including: the receiving terminal equipment determines the sequence index number k of the transmitting signal of the DMRS as the layer number k of the current transmission layer;

the indicating information is used for indicating the sequence index of the transmitting signal of the DMRS of the previous k layers, and the receiving end equipment determines the layer number k of the current transmission layer according to the indicating information, and the method comprises the following steps: the receiving terminal equipment determines the layer number k of the current transmission layer according to the sequence index number of the transmitting signals of the DMRS;

the indication information is used for indicating a sequence scrambling identifier of a DMRS (demodulation reference signal) of a previous k layers, and the receiving end equipment determines a layer number k of a current transmission layer according to the indication information, and the method comprises the following steps: the receiving terminal equipment determines the layer number k of the current transmission layer according to the sequence scrambling identification number of the DMRS;

the indicating information is used for indicating a sequence scrambling identification index k of the DMRS of the current transmission layer, wherein the sequence scrambling identification index k of the DMRS and the layer number of the transmission layer have a one-to-one correspondence relationship, and the receiving end equipment determines the layer number k of the current transmission layer according to the indicating information, and the method comprises the following steps: the receiving terminal equipment determines the sequence scrambling identification index number k of the DMRS as the layer number k of the current transmission layer;

the indication information is used for indicating the sequence scrambling identification index of the DMRS of the previous k layers, and the receiving end equipment determines the layer number k of the current transmission layer according to the indication information, and the method comprises the following steps: the receiving terminal equipment determines the layer number k of the current transmission layer according to the number of the sequence scrambling identification indexes of the DMRS; or

4. The method according to claim 1 or 2,

the method for determining the transmitting signals of the DMRS on the first k transmission layers by the receiving end equipment comprises the following steps:

the receiving end equipment determines the transmitting signal of the DMRS on the kth transmission layer according to the high-level signaling and/or the position of the DMRS mapping resource, and the receiving end equipment determines the transmitting signal of the DMRS on the 1 st to the kth-1 th transmission layers according to the sequence index of the transmitting signal of the DMRS indicated by the transmitting end equipment;

the receiving terminal equipment determines the transmitting signal of the DMRS on the kth transmission layer according to the high-level signaling and/or the position of the DMRS mapping resource, and the receiving terminal equipment determines the transmitting signal of the DMRS on the 1 st to the kth-1 th transmission layers according to the sequence scrambling identification of the DMRS; alternatively, the first and second electrodes may be,

5. The method according to claim 4, wherein the receiving end device determines the transmission signals of the DMRS on the 1 st to k-1 th transmission layers according to the sequence index of the transmission signal of the DMRS indicated by the transmitting end device, and comprises:

6. The method of claim 4, wherein the receiving end device determines the transmission signals of the DMRS on the 1 st to k-1 th transmission layers according to the sequence scrambling identity of the DMRS, and wherein the receiving end device determines the transmission signals of the DMRS on the 1 st to k-1 th transmission layers according to one of the following three ways:

the receiving terminal equipment determines the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers according to the default sequence scrambling identifiers of the DMRS, wherein the DMRS scrambling identifier signaling corresponding to all the transmission layers is default;

the receiving terminal equipment determines the transmitting signals of the DMRS on the 1 st to the k-1 th transmission layers according to the sequence scrambling identifiers of the DMRS configured by the DMRS scrambling identifier signaling, wherein the sequence scrambling identifiers of the DMRS corresponding to all the transmission layers are the same;

the receiving terminal equipment determines the transmitting signals of the DMRS on the 1 st to the (k-1) th transmission layers according to a Radio Network Temporary Identifier (RNTI) which is pre-configured and used as a sequence scrambling identifier of the nonlinear pre-coding, wherein the sequence scrambling identifiers of the DMRS corresponding to all the transmission layers are the RNTI.

7. A method for demodulating data, comprising:

the method comprises the steps that a sending terminal device generates indication information, wherein the indication information is used for determining a layer number k of a current transmission layer, and k is an integer larger than or equal to 1;

the sending end equipment sends indication information to receiving end equipment so that the receiving end equipment determines the layer number k of the current transmission layer according to the indication information and demodulates the data of the kth transmission layer according to the transmitting signals of the DMRS on the first k transmission layers,

wherein the demodulating the kth transport layer data from the transmitted signals of the DMRS on the first k transport layers comprises:

8. The method of claim 7,

9. The method according to claim 7 or 8, characterized in that the method further comprises: the sending end equipment sends at least one of the following information to the receiving end equipment:

DMRS maps resource location information;

DMRS scrambling identification signaling of all transmission layers;

10. A communications apparatus, comprising:

the receiving and sending unit is used for receiving the indication information sent by the sending end equipment;

the processing unit is used for determining the layer number k of the current transmission layer according to the indication information, wherein k is an integer greater than or equal to 1;

determining transmission signals of demodulation reference signals (DMRS) on the first k transmission layers;

demodulating the kth transmission layer data according to the transmitting signals of the DMRS on the first k transmission layers;

the processing unit is specifically configured to determine a power backoff factor λ of the kth transport layer data according to the transmission signal of the DMRS on the first k transport layers and the reception signal of the DMRS of the kth transport layer_k；

11. The communication device of claim 10,

the processing unit is specifically configured to determine, according to the transmission signal of the DMRS on the first k transmission layers and the reception signal of the DMRS of the kth transmission layer, a channel parameter l between the jth transmission layer and the kth transmission layer in the first k transmission layers_kjWherein j is an integer greater than or equal to 1 and less than or equal to k;

12. The communication device according to claim 10 or 11,

the indication information is used for indicating a DMRS port number k of a current transmission layer, wherein the DMRS port number and a layer number of the transmission layer have a one-to-one correspondence relationship, and the processing unit is specifically used for determining the DMRS port number k as the layer number k of the current transmission layer;

the indication information is used for indicating the sequence index of the transmission signal of the DMRS, and the processing unit is specifically used for determining the layer number k of the current transmission layer according to the number of the sequence indexes of the transmission signal of the DMRS;

the indication information is used for indicating a sequence scrambling identifier of the DMRS, and the processing unit is specifically used for determining a layer number k of the current transmission layer according to the number of the sequence scrambling identifiers of the DMRS;

the indication information is used for indicating a sequence scrambling identification index of the DMRS, and the processing unit is specifically used for determining a layer number k of the current transmission layer according to the number of the sequence scrambling identification indexes of the DMRS; alternatively, the first and second electrodes may be,

13. The communication device according to claim 10 or 11,

the processing unit is specifically configured to determine a transmission signal of the DMRS on the kth transmission layer according to a high-layer signaling and/or a DMRS mapping resource location, and determine transmission signals of the DMRS on the 1 st to the kth-1 st transmission layers according to a sequence index of the transmission signal of the DMRS indicated by the sending end device;

14. The communications apparatus according to claim 13, wherein the processing unit is specifically configured to determine the DMRS transmission signals on the 1 st to k-1 th transmission layers from a preset DMRS sequence set according to the sequence indexes of the DMRS transmission signals on the 1 st to k-1 th transmission layers indicated by a transmitting end device, wherein the DMRS sequence set includes one or more DMRS sequences specifically defined for non-linear precoding.

15. The communications apparatus according to claim 13, wherein the processing unit is specifically configured to determine the transmission signal of the DMRS on the 1 st to k-1 th transmission layers in one of the following three manners:

determining the transmitting signals of the DMRS on the 1 st to the k-1 th transmission layers according to the default sequence scrambling identifiers of the DMRS, wherein the signaling of the DMRS scrambling identifiers corresponding to all the transmission layers is default;

16. A communications apparatus for demodulating data, comprising:

the processing unit is used for generating indication information, wherein the indication information is used for determining a layer number k of a current transmission layer, and k is an integer greater than or equal to 1;

a transceiver unit, configured to send indication information to a receiving end device, so that the receiving end device determines a layer number k of a current transmission layer according to the indication information, and demodulates the kth transmission layer data according to transmission signals of DMRSs on the first k transmission layers,

17. The communication device of claim 16,

the indication information is used for indicating a sequence scrambling identification index k of the DMRS of the current transmission layer; alternatively, the first and second electrodes may be,

18. The apparatus according to claim 16 or 17, wherein the transceiving unit is further configured to transmit at least one of the following information to the receiving end device:

DMRS maps resource location information;

DMRS scrambling identification signaling of all transmission layers;

19. A computer-readable storage medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 9.