CN110768762A - Method for receiving and transmitting data and communication device - Google Patents

Method for receiving and transmitting data and communication device Download PDF

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Publication number
CN110768762A
CN110768762A CN201810840689.7A CN201810840689A CN110768762A CN 110768762 A CN110768762 A CN 110768762A CN 201810840689 A CN201810840689 A CN 201810840689A CN 110768762 A CN110768762 A CN 110768762A
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China
Prior art keywords
transmission scheme
sequence
data
dmrs
indication information
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吴晔
毕晓艳
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201810840689.7A priority Critical patent/CN110768762A/en
Priority to PCT/CN2019/097934 priority patent/WO2020020354A1/en
Publication of CN110768762A publication Critical patent/CN110768762A/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0224Channel estimation using sounding signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation

Abstract

The application provides a method for receiving and sending data and a communication device, which can facilitate terminal equipment to demodulate the data. The method comprises the following steps: terminal equipment receives a DMRS sequence and data from network equipment, wherein the DMRS sequence is related to a transmission scheme of the data; the terminal device demodulates the data based on the DMRS sequence to obtain an estimated value of the data. The corresponding relationship between the DMRS sequence and the transmission scheme may include: a parameter set for generating an initial value of a DMRS sequence corresponds to a transmission scheme, and/or a generation formula for generating an initial value of a DMRS sequence corresponds to a transmission scheme.

Description

Method for receiving and transmitting data and communication device
Technical Field
The present application relates to the field of wireless communications, and more particularly, to a method of receiving and transmitting data and a communication apparatus.
Background
Currently, multi-user multi-input multi-output (MU-MIMO) can support a network device and a plurality of terminal devices to transmit different data using the same time-frequency resource. However, when the network device transmits data with multiple terminal devices using the same time-frequency resource, the terminal devices may interfere with each other. For example, the terminal devices in the local cell may be interfered by the transmissions of the terminal devices in the neighboring cells, and the terminal devices in the same cell may interfere with each other. In order to obtain better signal reception quality, the terminal device needs to perform interference estimation.
However, as the multi-antenna technology is developed, a variety of transmission schemes have been proposed in order to adapt to different channel environments. It is therefore desirable to provide a method that facilitates the terminal device demodulating data under different transmission schemes.
Disclosure of Invention
The application provides a method for receiving and transmitting data and a communication device, aiming to reduce the complexity of demodulation.
In a first aspect, a method of receiving data is provided. The method comprises the following steps: receiving a demodulation reference signal (DMRS) sequence and data, the DMRS sequence being related to a transmission scheme of the data; and demodulating the data based on the DMRS sequence to obtain an estimated value of the data.
The method provided by the first aspect may be executed by a terminal device, and may also be executed by a chip configured in the terminal device, which is not limited in this application.
Based on the technical scheme, as the DMRS sequences are related to the transmission scheme of the data, the corresponding relation between the DMRS sequences and the transmission scheme can be established. The terminal equipment can determine the transmission scheme of the data according to the corresponding relation between the DMRS sequence and the transmission scheme while determining the DMRS sequence, thereby being convenient for demodulating the data. Further, the DMRS sequence (for example, referred to as a first DMRS sequence) addressed to the terminal device and the transmission scheme of data (for example, referred to as first data) correspond to each other, and the DMRS sequence (for example, referred to as a second DMRS sequence) interfering with the terminal device and the transmission scheme of data (for example, referred to as second data) also correspond to each other. Therefore, the terminal device can generate a second DMRS sequence based on the assumed transmission scheme according to the correspondence between the DMRS sequences and the transmission schemes, correlate the second DMRS sequence with the received signal to determine whether the terminal device is interfered, and further determine the transmission scheme of the second data when the terminal device is determined to be interfered. Therefore, the terminal equipment can conveniently carry out interference estimation based on the transmission scheme of the second data and the second DMRS sequence, and can conveniently demodulate the data.
Conversely, if the terminal device is unable to predetermine the transmission scheme of the second data, it is necessary to go through various possible transmission schemes to blindly detect, and repeatedly attempt data demodulation based on different transmission schemes until the demodulation is successful to complete the demodulation of the first data. Assuming N transmission schemes, the terminal device may need to repeatedly try N times of data demodulation to finally recover the first data, which is very computationally intensive.
However, if the terminal device can predetermine the transmission scheme of the second data, the interference estimation can be directly performed according to the transmission scheme of the second data and the second DMRS sequence, and then the first data is demodulated based on the first DMRS sequence and the interference noise covariance matrix obtained by the interference estimation, so that the complexity of the interference estimation of the terminal device can be greatly reduced, and the demodulation complexity can be reduced.
With reference to the first aspect, in certain implementations of the first aspect, a scrambling code identity n used for generating an initial value of the DMRS sequenceSCIDAnd sequence identification
Figure BDA0001745512570000021
Corresponds to at least one transmission scheme.
The corresponding relationship may be configured globally, configured at a cell level, configured at a User Equipment (UE) group (group) level, or configured at a UE level, which is not limited in the present application. In addition, the corresponding relationship may be predefined, such as protocol definition, or may be configured by the network device. This is not a limitation of the present application.
With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving first indication information, wherein the first indication information is used for indicating a first mapping relation, and the first mapping relation comprises any one of the following items: at least one scrambling code identity nSCIDA correspondence to at least one transmission scheme; or at least one sequence identifierA correspondence to at least one transmission scheme; or scrambling code identification nSCIDAnd sequence identification
Figure BDA0001745512570000023
And at least one transmission scheme.
In the embodiment of the application, the scrambling code used for generating one DMRS sequence may be identified by nSCIDAnd sequence identificationReferred to as a set of parameter sets. When the DMRS sequence corresponds to a transmission scheme, the set of parameters corresponds to the transmission scheme.
Due to the initial value and scrambling code identification n of DMRS sequenceSCIDSequence identification
Figure BDA0001745512570000025
Correlation, while scrambling code identification nSCIDAnd sequence identification
Figure BDA0001745512570000026
The corresponding relation can be configured in advance through the existing Radio Resource Control (RRC) message, therefore, when the scrambling code identifier n isSCIDAnd sequence identification
Figure BDA0001745512570000027
One item corresponds to a transmission scheme and the other item also corresponds to a transmission scheme.
With reference to the first aspect, in certain implementations of the first aspect, the method further includes: receiving second indication information for indicating a scrambling code identifier n used for generating an initial value of a DMRS sequenceSCIDAnd/or sequence identification
Figure BDA0001745512570000028
Therefore, the network device may not need to transmit separate signaling to indicate the transmission scheme of the data, and the transmission scheme of the data is already implicitly indicated while indicating the parameter for generating the initial value of the DMRS sequence, so that signaling overhead may be saved.
Further, the method further comprises: and the terminal equipment determines the transmission scheme of the data according to the second indication information.
Therefore, the terminal device may determine the transmission scheme of the data directly according to the parameter for generating the initial value of the DMRS sequence indicated by the second indication information and the correspondence between the at least one parameter set and the at least one transmission scheme.
With reference to the first aspect, in certain implementations of the first aspect, the at least one generation formula used for generating the initial values of the DMRS sequences corresponds to at least one transmission scheme.
The corresponding relationship may be configured globally, configured at a cell level, configured at a UE group level, and configured at a UE level, which is not limited in the present application. In addition, the corresponding relationship may be predefined, such as protocol definition, or may be configured by the network device. This is not a limitation of the present application.
With reference to the first aspect, in certain implementations of the first aspect, the method further includes:
and receiving third indication information, wherein the third indication information is used for indicating a generating formula of the initial value of the DMRS sequence.
Therefore, the network device may not need to transmit separate signaling to indicate the transmission scheme of the data, and the transmission scheme of the data may be implicitly indicated while indicating the generation formula of the initial value for generating the DMRS sequence, so that signaling overhead may be saved.
Further, the method further comprises: determining a transmission scheme of the data based on the third indication information.
Therefore, the terminal device may determine the transmission scheme of the data directly according to the parameter for generating the DMRS sequence indicated by the third indication information and the correspondence between the at least one generating equation and the at least one transmission scheme.
In a second aspect, a method of transmitting data is provided. The method comprises the following steps: generating a DMRS sequence, the DMRS sequence being related to a transmission scheme of data; and transmitting the DMRS sequence and data.
The method provided by the second aspect may be executed by a network device, or may be executed by a chip configured in the network device, which is not limited in this application.
Based on the technical scheme, as the DMRS sequences are related to the transmission scheme of the data, the corresponding relation between the DMRS sequences and the transmission scheme can be established. The network device may generate a DMRS sequence corresponding to the transmission scheme of the data according to a correspondence between the DMRS sequence and the transmission scheme of the data. The terminal equipment can determine the transmission scheme of the data according to the corresponding relation between the DMRS sequence and the transmission scheme while determining the DMRS sequence, thereby being convenient for demodulating the data. Further, the DMRS sequence (for example, referred to as a first DMRS sequence) addressed to the terminal device and the transmission scheme of data (for example, referred to as first data) correspond to each other, and the DMRS sequence (for example, referred to as a second DMRS sequence) interfering with the terminal device and the transmission scheme of data (for example, referred to as second data) also correspond to each other. Therefore, the terminal device can generate a second DMRS sequence based on the assumed transmission scheme according to the correspondence between the DMRS sequences and the transmission schemes, correlate the second DMRS sequence with the received signal to determine whether the terminal device is interfered, and further determine the transmission scheme of the second data when the terminal device is determined to be interfered. Therefore, the terminal equipment can conveniently carry out interference estimation based on the transmission scheme of the second data and the second DMRS sequence, and can conveniently demodulate the data.
Conversely, if the terminal device is unable to predetermine the transmission scheme of the second data, it is necessary to go through various possible transmission schemes to blindly detect, and repeatedly attempt data demodulation based on different transmission schemes until the demodulation is successful to complete the demodulation of the first data. Assuming N transmission schemes, the terminal device may need to repeatedly try N times of data demodulation to finally recover the first data, which is very computationally intensive.
However, if the terminal device can predetermine the transmission scheme of the second data, the interference estimation can be directly performed according to the transmission scheme of the second data and the second DMRS sequence, and then the first data is demodulated based on the first DMRS sequence and the interference noise covariance matrix obtained by the interference estimation, so that the complexity of the interference estimation of the terminal device can be greatly reduced, and the demodulation complexity can be reduced.
With reference to the second aspect, in some implementations of the second aspect, a scrambling code identity n used for generating an initial value of the DMRS sequenceSCIDAnd sequence identification
Figure BDA0001745512570000031
Corresponds to at least one transmission scheme.
The corresponding relationship may be configured globally, configured at a cell level, configured at a UE group level, and configured at a UE level, which is not limited in the present application. In addition, the corresponding relationship may be predefined, such as protocol definition, or may be configured by the network device. This is not a limitation of the present application.
With reference to the second aspect, in certain implementations of the second aspect, the method further includes: sending first indication information, where the first indication information is used to indicate a first mapping relationship, where the first mapping relationship includes any one of: at least one scrambling code identity nSCIDA correspondence to at least one transmission scheme; or at least one sequence identifier
Figure BDA0001745512570000032
A correspondence to at least one transmission scheme; or scrambling code identification nSCIDAnd sequence identificationAnd at least one transmission scheme.
In the embodiment of the application, the scrambling code used for generating one DMRS sequence may be identified by nSCIDAnd sequence identification
Figure BDA0001745512570000034
Referred to as a set of parameter sets. When DMRS sequence andthe set of parameters corresponds to the transmission scheme when the transmission scheme corresponds.
Due to the initial value and scrambling code identification n of DMRS sequenceSCIDSequence identificationCorrelation, while scrambling code identification nSCIDAnd sequence identification
Figure BDA0001745512570000036
The corresponding relation can be configured in advance through the existing Radio Resource Control (RRC) message, therefore, when the scrambling code identifier n isSCIDAnd sequence identification
Figure BDA0001745512570000037
One item corresponds to a transmission scheme and the other item also corresponds to a transmission scheme.
Optionally, the network device generates a DMRS sequence, including: and the network equipment determines a parameter set for generating the DMRS sequence according to the corresponding relation between the at least one parameter set and the at least one transmission scheme, and generates the DMRS sequence based on the parameter set.
With reference to the second aspect, in certain implementations of the second aspect, the method further includes: transmitting second indication information for indicating a scrambling code identity n used for generating an initial value of a DMRS sequenceSCIDAnd/or sequence identification
Therefore, the network device may not need to transmit separate signaling to indicate the transmission scheme of the data, and the transmission scheme of the data is already implicitly indicated while indicating the parameter for generating the initial value of the DMRS sequence, so that signaling overhead may be saved.
With reference to the second aspect, in certain implementations of the second aspect, the at least one generation formula for generating the initial values of the DMRS sequences corresponds to at least one transmission scheme.
The corresponding relationship may be configured globally, configured at a cell level, configured at a UE group level, and configured at a UE level, which is not limited in the present application. In addition, the corresponding relationship may be predefined, such as protocol definition, or may be configured by the network device. This is not a limitation of the present application.
Optionally, the network device generates a DMRS sequence, including: the network equipment determines a generating formula for generating the DMRS sequence according to the corresponding relation between the at least one generating formula and the at least one transmission scheme, and generates the DMRS sequence based on the generating formula.
With reference to the second aspect, in certain implementations of the second aspect, the method further includes:
and transmitting third indication information for indicating a generation formula of an initial value of the DMRS sequence.
Therefore, the network device may not need to transmit separate signaling to indicate the transmission scheme of the data, and the transmission scheme of the data may be implicitly indicated while indicating the generation formula of the initial value for generating the DMRS sequence, so that signaling overhead may be saved.
In a third aspect, a communication device is provided that includes means for performing the method of the first aspect or any one of the possible implementations of the first aspect.
In a fourth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute instructions in the memory to implement the method of the first aspect or any of the possible implementations of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.
In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.
In another implementation, the communication device is a chip configured in the terminal equipment. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.
Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.
In a fifth aspect, a communication device is provided, which comprises means for performing the method of the second aspect or any one of its possible implementations.
In a sixth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of the second aspect or any of the possible implementations of the second aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.
In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.
In another implementation, the communication device is a chip configured in the network device. When the communication device is a chip configured in a network device, the communication interface may be an input/output interface.
Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.
In a seventh aspect, a processor is provided, including: input circuit, output circuit and processing circuit. The processing circuitry is configured to receive signals via the input circuitry and to transmit signals via the output circuitry, such that the processor performs the method of the first or second aspect and any possible implementation of the first or second aspect.
In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.
In an eighth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and to receive signals via the receiver and transmit signals via the transmitter to perform the method of the first or second aspect and any possible implementation of the first or second aspect.
Optionally, the number of the processors is one or more, and the number of the memories is one or more.
Alternatively, the memory may be integral to the processor or provided separately from the processor.
In a specific implementation process, the memory may be a non-transient memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.
It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information 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 means in the above-mentioned eighth aspect may be one chip. The processor may be implemented by hardware or 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 ninth aspect, there is provided a computer program product, the computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first or second aspect and aspects described above.
A tenth aspect provides a computer-readable medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of any of the above-described first or second aspects and possible implementations of the first or second aspects.
In an eleventh aspect, a communication system is provided, which includes the foregoing network device and terminal device.
Drawings
FIG. 1 is a schematic diagram of a communication system suitable for use with embodiments of the present application;
FIG. 2 is a schematic flow chart diagram of a method for receiving and transmitting data provided by an embodiment of the present application;
fig. 3 is a schematic block diagram of a communication device provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: 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 (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) or New Radio (NR) system, and the like.
For the convenience of understanding the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 is a schematic diagram of a wireless communication system 100 suitable for use with embodiments of the present application. As shown, the wireless communication system 100 may include at least one network device, such as the network device 111 and the network device 112 shown in fig. 1, and the wireless communication system 100 may further include at least one terminal device, such as the terminal devices 121 to 123 shown in fig. 1. The network equipment and the terminal equipment can be both provided with a plurality of antennas, and the network equipment and the terminal equipment can communicate by using a multi-antenna technology.
Alternatively, network device 111 may be a network device in cell #1, or network device 111 may serve a terminal device (e.g., terminal device 121) in cell # 1. Network device 112 may be a network device in cell #2, or network device 112 may serve terminal devices (e.g., terminal device 122) in cell # 2.
It should be noted that a cell may be understood as a serving cell of a network device, that is, an area within a coverage area of a wireless network of the network device. In the present application, network device 111 in cell #1 and network device 112 in cell #2 may be different network devices, e.g., base stations. That is, cell #1 and cell #2 may be managed by different base stations. The network device 111 in the cell #1 and the network device 112 in the cell #2 may also be different radio frequency processing units of the same base station, for example, Radio Remote Units (RRUs), that is, the cell #1 and the cell #2 may be managed by the same base station, have the same baseband processing unit and if processing unit, but have different radio frequency processing units. This is not a particular limitation in the present application.
It should be understood that the network device in the wireless communication system may be any device having a wireless transceiving function. Such devices include, but are not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), Access Point (AP), wireless relay Node, wireless backhaul Node, Transmission Point (TP), or Transmission and Reception Point (TRP) in a wireless fidelity (WIFI) system, and the like, and may also be 5G, e.g., NR, gbb in a system, or transmission point (TRP or TP), one or a group of base stations in a 5G system may include multiple antennas, or may also constitute a panel of antennas, e.g., a network panel, or a panel of base stations, e.g., a NB, or a Distributed Unit (DU), etc.
In some deployments, the gNB may include a Centralized Unit (CU) and a 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 the function of a Radio Resource Control (RRC) layer, a Packet Data Convergence Protocol (PDCP) layer, and the DU implements the function of a Radio Link Control (RLC), a Medium Access Control (MAC), and a Physical (PHY) layer. 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 the RRC layer signaling, may also be considered to be transmitted by the DU or the DU + CU 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 a Radio Access Network (RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.
It should also be understood that terminal equipment in the wireless communication system may also be referred to as 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 terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in telemedicine (remote), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios.
Taking downlink transmission as an example, in the same cell, the network device may use the same time-frequency resource to communicate with multiple terminal devices. For example, in cell #1, network device 111 may communicate with terminal device 121 and terminal device 122 using the same time-frequency resources. In two adjacent cells, the network device may also communicate with multiple terminal devices using the same time-frequency resources. For example, in cell #1, the time-frequency resource used by network device 111 to communicate with terminal device 122 is the same as the time-frequency resource used by network device 112 to communicate with terminal device 123, and the time-frequency resource used by network device 111 to communicate with terminal device 122 may also be the same as the time-frequency resource used by network device 111 to communicate with terminal device 121.
Taking the example that terminal device 122 receives downlink data, terminal device 122 may be interfered by terminal device 121 and terminal device 123 when receiving data transmitted by network device 111. Therefore, the terminal device 122 needs to perform interference estimation so as to accurately demodulate the data sent to itself by the network device 111.
However, with the development of multi-antenna technology, various transmission schemes have been proposed. For example, Closed Loop Spatial Multiplexing (CLSM), Transmit Diversity (TD), and the like. Among them, the closed-loop space division multiplexing may be referred to as transmission scheme1 (TS 1) in the NR protocol. Transmit diversity may specifically include, but is not limited to: space Frequency Transmit Diversity (SFTD), or Space Frequency Block Coding (SFBC), Space Time Transmit Diversity (STTD), or Space Time Block Coding (STBC), RE-level precoding polling, etc.
Since the network devices process signals differently under different transmission schemes, interference estimation covariance matrices constructed by the terminal device 122 may be different. When performing interference estimation, if the transmission schemes used for data transmission by the terminal device 121 and the terminal device 123 cannot be known in advance, the terminal device 122 may need to traverse various transmission schemes in a blind detection manner to perform interference estimation and demodulation, which greatly increases the complexity of interference estimation and demodulation.
In view of the above, the present application provides a method for receiving and transmitting data, which can reduce the complexity of interference estimation and demodulation.
For convenience of distinction and explanation, in the embodiments shown below, the terminal devices are divided into a first terminal device and a second terminal device. The first terminal device and the second terminal device can both receive data from the network device. The first terminal device may be interfered by a signal transmitted to the second terminal device when receiving data from the network device; the second terminal device may also be interfered by the signal sent to the first terminal device when receiving data from the network device. The first terminal device and the second terminal device may be terminal devices of the same cell, or terminal devices of different cells. It will be appreciated that the first terminal device and the second terminal device are relative. If terminal device 121 in fig. 1 is a first terminal device, terminal device 122 may be a second terminal device; terminal device 122 in fig. 1 is a first terminal device, then terminal devices 121 and 123 may be second terminal devices.
For the purpose of facilitating an understanding of the present application, a brief description of several concepts involved in the present application will be provided before describing embodiments of the present application.
1. Resource Element (RE): or resource elements. One symbol may be occupied in the time domain and one subcarrier may be occupied in the frequency domain.
2. Resource Block (RB): one RB occupies in the frequency domain
Figure BDA0001745512570000081
A continuous sub-carrier occupying in time domain
Figure BDA0001745512570000082
A number of consecutive symbols. Wherein the content of the first and second substances,
Figure BDA0001745512570000083
are all positive integers. For example, in the LTE protocol,
Figure BDA0001745512570000084
it may be equal to 12 a and,may be equal to 7; in the NR protocol, the number of channels is,
Figure BDA0001745512570000086
it may be equal to 12 a and,may be equal to 14. In the embodiment of the present application, an RB may be an example of a resource unit.
3. Symbol (symbol): minimum unit of time domain resource. The time length of one symbol is not limited in the embodiment of the present application. The length of one symbol may be different for different subcarrier spacings. The symbols may include uplink symbols and downlink symbols, and the uplink symbols may be referred to as Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbols or orthogonal Frequency Division Multiple Access (OFDM) symbols, for example and without limitation; the downlink symbols may be referred to as OFDM symbols, for example.
4. Resource unit: the method can be used as a metering unit of the resource occupied by the resource in the time-frequency domain. In the embodiment of the present application, the resource unit may include, for example, an RB, a resource block group (RB group, RBG) composed of one or more RBs, one or more RB pairs (RB pair), a half RB, 1/4 RBs, an RE group composed of one or more REs, and the like. In the NR protocol, one RB may be composed of 12 consecutive subcarriers in the frequency domain and 14 consecutive symbols in the time domain. It should be understood that the above examples are illustrative only and should not be construed as limiting the present application in any way.
5. Time slot: in NR, a slot is a minimum scheduling unit of time. One slot format is that 14 OFDM symbols are contained, and the CP of each OFDM symbol is a normal CP; one slot format is that 12 OFDM symbols are included, and the CP of each OFDM symbol is an extended CP; one slot format is to contain 7 OFDM symbols, each of which has a normal CP. The OFDM symbols in one slot may be all used for uplink transmission; can be used for downlink transmission; or one part can be used for downlink transmission, one part can be used for uplink transmission, and one part is reserved for no transmission. It should be understood that the above examples are illustrative only and should not be construed as limiting the present application in any way. The slot format is not limited to the above example for system forward compatibility considerations.
6. The transmission scheme is as follows: or, the transmission scheme may be defined in the LTE protocol or the NR protocol. The transmission scheme may be used to indicate the technical scheme used to transmit the data. It should be understood that the transmission scheme is just one nomenclature and this application does not exclude the possibility of replacing the transmission scheme by another nomenclature in future protocols.
7. Space division multiplexing: under the condition that the quality of a wireless channel is good and the rank of a channel matrix is greater than 1, the MIMO system can utilize a plurality of transmitting antennas and a plurality of receiving antennas to transmit multi-path data in parallel, and the multi-path data transmitted in parallel are different, so that the throughput of data transmission can be improved.
8. Closed loop (closed loop) space division multiplexing: it may also be referred to as transmission scheme 1(transmission scheme1, TS1) in the NR protocol. When transmitting a plurality of data streams in parallel, the transmitting end may determine a corresponding precoding matrix according to CSI of a downlink channel, especially PMI and RI, and perform precoding on each of the plurality of data streams to be transmitted and then transmit the precoded data streams. It is noted that closed loop spatial multiplexing also involves transmitting one data stream with only one antenna port.
Wherein, the CSI of the downlink channel may be fed back by the receiving end based on the reference signal; or the sending end obtains the CSI of the downlink channel by measuring the uplink channel according to the reciprocity of the uplink channel and the downlink channel; or by combining reciprocity of uplink and downlink channels with feedback of a receiving end. This is not limited in this application.
9. And (3) transmission diversity: under the condition that the quality of a wireless channel is poor or a receiving end only has one receiving antenna, the MIMO system can utilize a plurality of transmitting antennas to send multi-path same data in parallel, thereby improving the reliability of data transmission. The diversity, that is, dividing one signal into multiple paths, sending out at different time, different frequency or different space, and the receiving end combining in a centralized manner. When some signals are deeply faded, the fading of other signals can be lighter, and the probability of the deep fading of each path of signal is lower, so that the probability of the deep fading of the synthesized signal is greatly reduced. In other words, transmit diversity can be understood as a method of reducing the probability of deep fading of a composite signal by a plurality of independently faded signals, thereby advantageously achieving diversity gain.
The multiple signals are transmitted at different times, which can be called time diversity; the multi-path signals are transmitted at different frequencies, which can be called frequency diversity; the transmission of multiple signals in different spaces may be referred to as spatial diversity.
10. Space-frequency block coding: the space-frequency transmit diversity scheme is provided by combining space diversity and frequency diversity. The modulated symbol streams are subjected to layer mapping and Alamouti coding to obtain at least two symbol streams, and then the at least two symbol streams are precoded and transmitted.
Specifically, assume that the modulated symbol stream is s2、s1The symbol stream after layer mapping can be represented as at least two layers
Figure BDA0001745512570000091
The two symbol streams obtained by Alamouti coding the two symbol streams in the space domain and the frequency domain can be expressed as
Figure BDA0001745512570000092
That is, on the first subcarrier, the first antenna and the second antenna respectively transmit s1And s2On the second subcarrier, the first antenna and the second antenna respectively transmit
Figure BDA0001745512570000093
And
Figure BDA0001745512570000094
correspondingly, on the first subcarrier, it can be assumed that the receiving end receives the signal r1On the second subcarrier, it can be assumed that the receiving end receives the signal r2The receiving end can be based on the received signal r1And r2To determine s1And s2
Optionally, the two symbol streams obtained after the above-mentioned transmit diversity operation can also be expressed asI.e. on the first subcarrier, the first and second antennas have transmitted s, respectively1And
Figure BDA0001745512570000096
on the second subcarrier, the first antenna and the second antenna respectively transmit s2And
11. space-time block coding: a space-time transmit diversity scheme is proposed that combines spatial diversity and time diversity. Similar to space-frequency block coding, the modulated symbol streams are subjected to layer mapping and Alamouti coding to obtain at least two symbol streams, and then the at least two symbol streams are precoded and transmitted.
The symbol stream obtained after layer mapping and Alamouti coding is assumed to be
Figure BDA0001745512570000101
The transmitting end may transmit s via the first antenna and the second antenna on the first symbol respectively1And s2On the second symbol, the signals are transmitted via the first and second antennas respectively
Figure BDA0001745512570000102
Andcorrespondingly, on the first symbol, it can be assumed that the receiving end receives the signal r1On the second symbol, it can be assumed that the receiving end has received the signal r2The receiving end can be based on the received signal r1And r2To determine s1And s2
Optionally, the two symbol streams obtained after the above-mentioned transmit diversity operation can also be expressed as
Figure BDA0001745512570000104
That is, the first antenna and the second antenna transmit s respectively in the first time unit1And
Figure BDA0001745512570000105
at the second time unit, the first antenna and the second antenna respectively transmit s2And
Figure BDA0001745512570000106
12. port: or antenna port. It can be understood as a transmitting antenna recognized by the receiving end, or a transmitting antenna that can be spatially differentiated. One antenna port may be configured for each virtual antenna, which may be a weighted combination of multiple physical antennas. The antenna ports may be divided into a reference signal port and a data port according to a difference of signals carried. The reference signal ports include, but are not limited to, DMRS ports, CSI-RS ports, and the like.
13. Demodulation reference signal: reference signals that may be used for demodulation of data or signaling. According to different transmission directions, the method can be divided into an uplink demodulation reference signal and a downlink demodulation reference signal. The demodulation reference signal may be DMRS in LTE protocol or NR protocol, or may also be other reference signals defined in future protocols for implementing the same or similar functions. This is not limited in this application.
In LTE or NR protocols, DMRS may be carried in a physical shared channel and transmitted with data signals for demodulating the data signals carried in the physical shared channel. For example, the downlink data is transmitted together with the Physical Downlink Shared Channel (PDSCH) or the uplink data is transmitted together with the Physical Uplink Shared Channel (PUSCH). The DMRS may also be carried in a physical control channel and transmitted together with the control signaling, so as to demodulate the control signaling carried in the physical control channel aggregate. For example, the downlink control signaling is transmitted together with a Physical Downlink Control Channel (PDCCH) or the uplink control signaling is transmitted together with a Physical Uplink Control Channel (PUCCH).
In the embodiment of the present application, the demodulation reference signal may include a downlink demodulation reference signal transmitted through a PDCCH or a PDSCH, and may also include an uplink demodulation reference signal transmitted through a PUCCH or a PUSCH. Hereinafter, for convenience of explanation, the demodulation reference signal is simply referred to as DMRS.
In LTE and NR protocols, DMRS may employ pseudo-random (PN) sequences, and thus, may also be referred to as DMRS sequences. In the embodiments of the present application, "DMRS" and "DMRS sequence" are used interchangeably, but those skilled in the art will understand that the intended meanings thereof are consistent when the differences are not emphasized.
The DMRS sequence may be composed of modulation symbols carried on a plurality of REs, and each modulation symbol may be, for example, a Quadrature Phase Shift Keying (QPSK) symbol. Wherein, the modulation symbol r (n) of the DMRS sequence carried on the nth subcarrier may be obtained by formula one shown below:
Figure BDA0001745512570000111
where r (n) is in the form of a complex number obtained by modulating the PN sequence, e.g., representing a QPSK symbol. n denotes an nth subcarrier among subcarriers occupied by the DMRS among Component Carriers (CCs). n is 0, 1, 2, … …,
Figure BDA0001745512570000112
d represents the density (diversity) of DMRS on one OFDM symbol within one RB,
Figure BDA0001745512570000113
may represent the number of RBs included in one CC. c (i) denotes the initial value cinitA defined PN sequence.
Initial value cinitCan be further derived from equation two shown below:
Figure BDA0001745512570000114
where l denotes the l-th symbol within a slot,
Figure BDA0001745512570000115
indicating the number of time slots within a frame,
Figure BDA0001745512570000116
indicating the number of symbols in a slot. Sequence identification
Figure BDA0001745512570000117
Initial value c that can be used to generate DMRS sequencesinit. Scrambling code identification nSCIDThe method can be used for indicating DMRS sequence scrambling code generation information.
In NR, nSCIDMay be indicated by Downlink Control Information (DCI),may be indicated by higher layer parameters. For example, when the terminal device receives DCI of format (format)1_1, the DCI may include a flag indicating nSCIDAn indication field of the value of. In NR, the nSCIDThe value of (1) can be 0 or 1, and can be used for downlink transmission; higher-layer parameter scrambling code identification 0(scrambling ID0) and scrambling code identification (scrambling ID1) configurable n in DMRS downlink configuration (DMRS-DownlinkConfig) Information Element (IE)SCIDWhen the value of (A) is 0 or 1 respectively
Figure BDA0001745512570000119
The value of (c). In the case of the NR, the group,
Figure BDA00017455125700001110
for another example, when the terminal device receives DCI of format 1_0, the n may be implicitly indicatedSCIDIs 0, and the value of n isSCIDCan be used for downlink transmission. The higher layer parameter scramblingID0 in the DMRS-DownlinkConfig IE may be configured with nSCIDWhen the value of (A) is 0
Figure BDA00017455125700001111
The value of (c). In the case of the NR, the group,
Figure BDA00017455125700001112
for another example, when the terminal device receives DCI of format 0_1, it may determine that the DCI is used for uplink transmissionnSCIDIs 0 or 1, the high-level parameters can be respectively configured with nSCIDWhen the value of (A) is 0 or 1 respectively
Figure BDA00017455125700001113
The value of (c). In the case of the NR, the group,
Figure BDA00017455125700001114
also for example, when the terminal device receives DCI of format 0_0, n for uplink transmission may be determinedSCIDIs 0, the high level parameter can be configured with nSCIDWhen the value of (A) is 0
Figure BDA00017455125700001115
The value of (c). In the case of the NR, the group,
when the terminal device does not receive the listed DCI, the default is
Figure BDA00017455125700001117
Is cell identification
Figure BDA00017455125700001118
It can be seen that nSCIDAndn used by DMRS transmitted to different terminal devices, in most cases at UE specificSCIDAnd
Figure BDA00017455125700001120
may be the same or different.
In the embodiments shown below, for convenience of explanation, the initial value c will be determinedinitScrambling code identification nSCIDAnd sequence identificationA parameter set may comprise a scrambling code identity n, abbreviated as a parameter setSCIDAnd a sequence identifier
Figure BDA00017455125700001122
Combination for short. Scrambling code identification n in one parameter setSCIDAnd the sequence identifier may be used to determine an initial value cinit
In addition, in order to facilitate understanding of the embodiments of the present application, the following description is made.
First, in the embodiment of the present application, for convenience of description, symbols included in one resource unit in the time domain are numbered consecutively from #0, and subcarriers included in the frequency domain are numbered from # 0. Taking an example where one resource unit is one RB, the RB may include, for example, symbol #0 to symbol #13 in the time domain, and may include, for example, subcarrier #0 to subcarrier #11 in the frequency domain. Also, for convenience of understanding, i of the ith (i ≧ 0, and i is an integer) symbol (or subcarrier) in the following description corresponds to the number (index) of the symbol (or subcarrier), e.g., the 0 th symbol, corresponding to the symbol numbered 0, i.e., symbol # 0.
It should be understood that the above descriptions are provided for describing the technical solutions provided in the embodiments of the present application, and are not intended to limit the scope of the present application, and the specific implementation is not limited thereto. For example, one resource unit may include symbol #1 to symbol #14 in the time domain and may include subcarrier #1 to subcarrier #12 in the frequency domain.
Second, in the embodiments of the present application, transformation of various matrices is involved. For ease of understanding, the transformation of several matrices referred to in this application is described here in a unified way. The superscript H denotes a conjugate transpose, e.g., AHRepresents the conjugate transpose of matrix (or vector) a; the upper corner marks represent conjugation, e.g. B*Represents the conjugate of matrix (or vector) B; -representing the estimated value of the estimated value, e.g.,
Figure BDA0001745512570000121
representing an estimate of a matrix (or vector) C. The same or similar cases are omitted for brevity hereinafterAnd (4) description.
Third, in the present embodiment, "DMRS" and "DMRS sequence" may be used alternately, and the intended meanings thereof are consistent when the differences are not emphasized.
Fourth, in the embodiments shown below, the first, second, and third are merely for convenience of distinguishing different objects, and should not constitute any limitation to the present application. For example, different terminal devices, different DMRSs, different indication information, and the like are distinguished.
Fifth, in the embodiments shown below, "pre-acquisition" may include signaling by the network device or pre-defined, e.g., protocol definition. The "predefined" may be implemented by saving a corresponding code, table, or other means that can be used to indicate the relevant information in advance in the device (for example, including the terminal device and the network device), and the present application is not limited to a specific implementation manner thereof.
Sixth, the term "store" in the embodiments of the present application may refer to a store in one or more memories. The one or more memories may be provided separately or integrated in the encoder or decoder, the processor, or the communication device. The one or more memories may also be provided separately, with a portion of the one or more memories being integrated into the decoder, the processor, or the communication device. The type of memory may be any form of storage medium and is not intended to be limiting of the present application.
Seventh, the "protocol" referred to in the embodiments of the present application may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and a related protocol applied in a future communication system, which is not limited in the present application.
Eighth, "and/or" describes an association relationship of the associated objects, indicating that there may be three relationships, e.g., a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one" means one or more than one; "at least one of a and B", similar to "a and/or B", describes an association relationship of associated objects, meaning that three relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
It should be understood that the technical solution of the present application can be applied to downlink transmission in a wireless communication system. The wireless communication system may include at least one network device and at least two terminal devices. The wireless communication system may be, for example, the communication system 100 shown in fig. 1. When the network device 111 uses the same time-frequency resource to respectively send downlink data to the terminal device 121 and the terminal device 122, the terminal device 121 and the terminal device 122 may interfere with each other; for another example, when the time-frequency resource for the network device 111 to send downlink data to the terminal device 121 is the same as the time-frequency resource for the network device 112 to send downlink data to the terminal device 123, the terminal device 121 and the terminal device 123 may interfere with each other.
Hereinafter, the method for receiving and transmitting data according to the embodiment of the present application will be described in detail by taking interaction between the first terminal device and the network device as an example without loss of generality.
Fig. 3 is a schematic flow chart diagram of a method 200 of receiving and transmitting data provided by an embodiment of the present application, shown from the perspective of device interaction. As shown, the method 200 may include steps 210-250. The method 200 is described in detail below.
In step 210, the network device generates a DMRS sequence that is related to a transmission scheme of the data.
In this embodiment, for convenience of differentiation and explanation, a DRMS sequence generated and sent by the network device to the first terminal device may be denoted as a first DMRS sequence, and data generated and sent by the network device to the first terminal device may be denoted as first data; accordingly, the DMRS sequence generated and transmitted by the network device to the second terminal device may be referred to as a second DMRS sequence, and data generated and transmitted by the network device to the second terminal device may be referred to as second data.
Specifically, the DMRS sequence is related to a transmission scheme of data. That is, the first DMRS sequence is related to a transmission scheme of the first data, and the second DMRS sequence is related to a transmission scheme of the second data.
As described above, in LTE or NR, each modulation symbol r (n) in the DMRS sequence may be represented by an initial value cinitAnd the initial value may be determined by equation two listed above. When the initial value is fixed, each modulation symbol r (n) in the DMRS sequence may be determined. Therefore, when the DMRS sequence is related to the transmission scheme of the data, the initial value may also be related to the transmission scheme of the data.
Referring again to equation two, the initial value may be associated with the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000131
And (4) correlating. When any one of the parameters in the parameter set for calculating the initial value is different, that is, the scramble code identification nSCIDAnd sequence identification
Figure BDA0001745512570000132
Any one of them may be different, and the initial value obtained by calculation may be different. In addition, when the generation formula of the initial value is changed, n is identified based on the same scrambling codeSCIDAnd sequence identification
Figure BDA0001745512570000133
The initial values calculated may also be different.
When a DMRS sequence is related to a transmission scheme of data, a parameter set for generating an initial value of the DMRS sequence may have a correspondence with the transmission scheme; alternatively, the generation formula for generating the initial value of the DMRS sequence may be related to a transmission scheme; alternatively, both the parameter set and the generation formula used to generate the initial value of the DMRS sequence may be related to the transmission scheme. When a protocol defines a relation of a DMRS sequence and a transmission scheme as a certain case enumerated below by default, both a network device and a terminal device may generate the DMRS sequence based on a corresponding manner.
It is to be noted that the correspondence of the DMRS sequences listed above to the transmission schemes of the data may be global, e.g., all communication devices in the protocol defined communication system may follow the same correspondence; the corresponding relationship between the DMRS sequence and the data transmission scheme may also be at a UE group (UE group) level, that is, all terminal devices in the same UE group may follow the same corresponding relationship, and the terminal devices included in the UE group may be configured in advance by a network device; the correspondence between the DMRS sequence and the data transmission scheme may also be cell-level, that is, all communication apparatuses in the same cell may follow the same correspondence; the correspondence between the DMRS sequences and the transmission schemes of the data may also be UE-level, that is, the correspondence is configured for each terminal device.
The corresponding relationship between the DMRS sequence and the data transmission scheme may be predefined, for example, a protocol is defined, and both the network device and the terminal device may store the corresponding relationship in advance; the corresponding relationship between the DMRS sequence and the data transmission scheme may also be configured by the network device to the terminal device. When the correspondence is configured by the network device and is at a global or UE group level, all network devices in the communication system may configure the same correspondence, for example, by an algorithm.
The specific process of generating DMRS by the network device will be described below with reference to the above three possible cases.
In case one, a parameter set for generating an initial value of a DMRS sequence corresponds to a transmission scheme:
specifically, the protocol may default to one or more sets of dedicated parameters for each transmission scheme, and when the network device determines a parameter in the set of parameters, n may be identified based on the scrambling code in the set of parametersSCIDAnd sequence identification
Figure BDA0001745512570000134
A DMRS sequence is generated. Thus, prior to step 210, optionally, the method 200 further comprises: the network device determines a set of parameters corresponding to the transmission scheme. The network device may determine the set of parameters corresponding to the transmission scheme by several implementations:
implementation mode 1, the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000135
The correspondence of the combination of (a) to the transmission scheme may be predefined, as defined by the protocol.
Specifically, the protocol may predefine at least one group of parameter sets corresponding to at least one transmission scheme, each transmission scheme may correspond to one or more groups of parameter sets, each group of parameter sets includes a scrambling code identifier nSCIDAnd corresponding sequence identification
Figure BDA0001745512570000141
In this implementation, the network device may determine the parameter set corresponding to the transmission scheme for data transmission according to a correspondence relationship between at least one set of parameters and at least one transmission scheme defined by the protocol.
Implementation mode 2, the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000142
The correspondence of the combination of (a) and the transmission scheme may be configured by the network device.
Specifically, the network device may determine a correspondence between at least one set of parameters and at least one transmission scheme in advance, and may determine a set of parameters corresponding to a transmission scheme used for data transmission according to the correspondence between the at least one set of parameters and the at least one transmission scheme.
Implementation mode 3, the scrambling code identifier nSCIDThe corresponding relation with the transmission scheme can be defined by a protocol or configured by network equipment, and the scrambling code identifier nSCIDAnd sequence identificationMay be configured by the network device.
In particular, the protocol may predefine at least one scrambling code identity nSCIDCorresponding relation with at least one transmission schemeAlternatively, the network device may be preconfigured with at least one scrambling code identifier nSCIDCorresponding relation with at least one transmission scheme, each transmission scheme can correspond to one or more scrambling code identifiers nSCID. In addition, the network device can configure and scramble identifier n in advance through high-level signalingSCIDCorresponding sequence identification
Figure BDA0001745512570000144
For example, it may be configured through an existing RRC message.
The network device may identify n according to at least one scrambling code defined by the protocolSCIDCorresponding relation with at least one transmission scheme and each scrambling code identification n determined by itselfSCIDCorresponding sequence identification
Figure BDA0001745512570000145
A parameter set corresponding to a transmission scheme for data transmission is determined.
Implementation 4, sequence identification
Figure BDA0001745512570000146
The corresponding relation with the transmission scheme can be defined by a protocol or configured by network equipment, and the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000147
The correspondence of (a) may be determined by the network device.
In particular, the protocol may predefine at least one sequence identification
Figure BDA0001745512570000148
Corresponding relation with at least one transmission scheme, or network equipment can be configured with at least one sequence identification in advanceCorresponding relation with at least one transmission scheme, each transmission scheme can correspond to one or more sequence identifications
Figure BDA00017455125700001410
In addition, the network equipment can also configure and scramble identifier n in advance through high-level signalingSCIDCorresponding sequence identification
Figure BDA00017455125700001411
For example, it may be configured through an existing RRC message.
The network device can determine at least one sequence identifier corresponding to the protocol and at least one transmission scheme according to the corresponding relationship between the at least one sequence identifier and the at least one transmission scheme, and each scrambling code identifier n determined by the network deviceSCIDCorresponding sequence identification
Figure BDA00017455125700001412
A parameter set corresponding to a transmission scheme for data transmission is determined.
In case two, the generation formula (or calculation method) of the initial value corresponds to the transmission scheme:
the formula listed above for generating the initial values of the DMRS sequences may be understood as a calculation manner of the initial values of the DMRS sequences. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.
In particular, the protocol may default to a generation of one initial value for each transmission scheme. For example, when the communication system transmits data with different terminal devices using transmission schemes such as TS1, SFTD, and STTD, the protocol may define in advance a generation formula of an initial value corresponding to each transmission scheme. For example, when the transmission scheme is TS1, the generation formula of the initial value may be, for example, formula two listed above; when the transmission scheme is SFTD or STTD, the generation formula of the initial value may be another formula different from formula two, such as formula three or formula four listed below:
the formula III is as follows:
Figure BDA00017455125700001413
the formula four is as follows:
Figure BDA00017455125700001414
when the network device determines the transmission scheme used for transmitting data with the terminal device, a formula for generating an initial value of the DMRS sequence may be determined.
And in case three, the parameter set for generating the initial value and the generating formula of the initial value both correspond to the transmission scheme:
specifically, when the parameter set used to generate the initial value and the generation formula both correspond to the transmission scheme, the network device may determine the parameter set corresponding to the transmission scheme according to one of the four possible implementations shown in case one. Further, the network device may also determine a generation formula of an initial value corresponding to the transmission scheme according to the manner shown in case two. Thus, the network device may generate an initial value of the DMRS according to the determined parameter set for generating the initial value and the generating equation, and further generate the DMRS sequence.
It should be understood that the above shows several possible scenarios of DMRS sequence corresponding to a transmission scheme for ease of understanding only, but this should not constitute any limitation to the present application. Other technical schemes for associating the DMRS sequence with the transmission scheme are all within the scope of the present application.
In addition, in the above-listed correspondence relationship of the DMRS sequences and the transmission schemes, the transmission schemes may be indicated by indexes. For example, the network device may transmit the correspondence between the parameter set for generating the initial value of the DMRS sequence and the transmission scheme to the terminal device, or the network device may transmit the correspondence between the parameter set for generating the initial value of the DMRS sequence and the index of the transmission scheme to the terminal device. For another example, the network device and the terminal device may store in advance a correspondence between a generation formula for generating an initial value of a DMRS sequence and a transmission scheme, or the network device and the terminal device may store in advance a correspondence between a generation formula for generating an initial value of a DMRS sequence and an index of a transmission scheme.
When the transmission scheme is indicated by the index, different transmission schemes may be indicated by different values in the same indication bit. For example, an indication bit "0" represents TS1, an indication bit "1" represents TS 2; for example, the indication bit "00" indicates TS1, the indication bit "01" indicates SFTD, and the indication bit "10" indicates STTD. For the sake of brevity, this is not to be enumerated here. It should be understood that the corresponding relation between the indication bits and the transmission scheme listed herein is only an exemplary illustration, and should not constitute any limitation to the present application. Further, the network device may process the data to be transmitted based on the transmission scheme of the data to transmit the data in step 220. It should be understood that, since the specific method for the network device to process the data based on the transmission scheme may be the same as the prior art, several different ways of processing the data under different transmission schemes have been listed in the foregoing. A detailed description of this particular process is omitted here for the sake of brevity.
In step 220, the network device transmits the DMRS sequence and data.
In particular, the DMRS sequence and data may be carried on the PDSCH, for example. The network device may map the DMRS sequence generated in step 210 and the data to be transmitted to the PDSCH, and send the DMRS sequence and the data to be transmitted to each terminal device. Each terminal device may determine a time-frequency resource for receiving the PDSCH according to a previously received control channel, for example, a Physical Downlink Control Channel (PDCCH), and further receive the DMRS sequence and data on a corresponding time-frequency resource.
It should be understood that the specific procedure for the network device and each terminal device to transmit the DMRS sequence and data may be the same as the prior art, and a detailed description of the specific procedure is omitted here for brevity.
Optionally, the step 220 specifically includes:
step 2201, the network device transmits the first DMRS sequence and the first data.
In this embodiment, for convenience of distinction and explanation, the DMRS sequence that the network device transmits to the first terminal device may be referred to as a first DMRS sequence, and data that the network device transmits to the first terminal device may be referred to as first data.
Accordingly, in step 2201, the first terminal device receives the first DMRS sequence and the first data. The first DMRS sequence and data may be carried on the PDSCH, for example. A terminal device may receive the first DMRS sequence and first data on the PDSCH.
In step 230, the first terminal device demodulates the first data based on the first DMRS to obtain an estimate of the first data.
The first terminal device may estimate an equivalent channel matrix from the first DMRS sequence received in step 2201 and the first DMRS sequence generated by itself.
A specific procedure for generating the first DMRS sequence by the first terminal device is first described in detail below.
As previously mentioned, since the DMRS sequences are related to the transmission scheme, for the first terminal device, the first DMRS sequence it receives is related to the transmission scheme. Since the initial value of the first DMRS sequence is related to the transmission scheme, the first terminal device also needs to determine the initial value used to generate the first DMRS sequence when generating the first DMRS sequence. Specifically, when an initial value of the first DRMS sequence is related to a transmission scheme, a parameter set for generating the initial value may have a correspondence with the transmission scheme; alternatively, the generation formula for generating the initial value may be related to the transmission scheme; alternatively, both the parameter set and the generation formula used to generate the initial value may be related to the transmission scheme. Therefore, the first terminal device may acquire a correspondence relationship between an initial value of the DMRS sequence and the transmission scheme in advance when generating the first DMRS sequence.
A specific procedure for generating the first DMRS by the first terminal device will be described below with reference to the above three possible cases, respectively. It should be noted that, when the protocol defines the relation between the DMRS sequence and the transmission scheme as a default in a certain case listed below, both the network device and the first terminal device may generate the DMRS based on a corresponding manner.
In case one, a parameter set for generating an initial value of a DMRS sequence corresponds to a transmission scheme:
the generation formula of the initial value of the case-one default DMRS sequence has no correspondence with the transmission scheme. That is, the generation equations of the initial values are not distinguished for different transmission schemes. In other words, for different transmission schemes, it may be assumed that the same initial value of the generator is used. The generating equation may be, for example, a generating equation used in the prior art, such as equation two described above.
Specifically, the correspondence between the parameter set and the transmission scheme may be predefined, such as protocol definition, or may be indicated to the first terminal device after being determined by the network device. The first terminal device may determine a correspondence between the at least one parameter set and the at least one transmission scheme by the following implementation manners, respectively:
implementation mode 1, the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000161
The correspondence of the combination of (a) to the transmission scheme may be predefined, as defined by the protocol. The first terminal device may pre-store a correspondence of the at least one parameter set with the at least one transmission scheme.
Implementation mode 2, the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000162
The correspondence to the transmission scheme may be network device configured.
Optionally, the method further comprises: the method comprises the steps that a first terminal device receives first indication information, the first indication information is used for indicating a first mapping relation, and the first mapping relation is used for indicating any one of the following items:
a) at least one scrambling code identity nSCIDA correspondence to at least one transmission scheme; or
b) At least one sequence identifier
Figure BDA0001745512570000163
A correspondence to at least one transmission scheme; or
c) Scrambling code identification nSCIDAnd corresponding sequence identification
Figure BDA0001745512570000164
And at least one transmission scheme.
Accordingly, the network device sends the first indication information to indicate the first mapping relationship.
When the network device indicates a) or b) above through the first indication information, the network device may configure the scrambling code identifier n through the existing higher layer signaling in advanceSCIDAnd
Figure BDA0001745512570000165
sequence-identified correspondences, such as the high-level parameters described above. After receiving the first indication information and the high-level signaling, the first terminal device can identify n according to the scrambling codeSCIDOr sequence identification
Figure BDA0001745512570000168
Corresponding relation with transmission scheme, and scrambling code identification nSCIDAnd sequence identification
Figure BDA0001745512570000166
Determining scrambling code identification n corresponding to various transmission schemesSCIDAnd sequence identification
Figure BDA0001745512570000167
I.e. determining a correspondence of at least one parameter set to at least one transmission scheme.
When the network device indicates the c) through the first indication information, the first indication information can directly configure at least one scrambling code identifier n through one signalingSCIDAnd the corresponding sequence identificationCorresponding relation with at least one transmission scheme, so that the first terminal equipment determines scrambling code identification n corresponding to various transmission schemesSCIDAnd sequence identification
Figure BDA0001745512570000172
By way of example and not limitation, the first indication information may be carried in any one of: RRC message, MACCE, or DCI.
Implementation mode 3, the scrambling code identifier nSCIDThe corresponding relation with the transmission scheme can be defined by a protocol or configured by network equipment, and the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000173
May be configured by the network device.
In particular, the protocol may predefine at least one scrambling code identity nSCIDCorresponding relation with at least one transmission scheme, or the network equipment can be configured with at least one scrambling code identification n in advanceSCIDCorresponding relation with at least one transmission scheme, each transmission scheme can correspond to one or more scrambling code identifiers nSCID. In addition, the network device can configure the scrambling code identifier n in advance through high-level signalingSCIDAnd sequence identification
Figure BDA0001745512570000174
The corresponding relationship of (1). For example, it may be configured through an existing RRC message.
The first terminal device may identify n according to at least one scrambling code defined by the protocolSCIDCorresponding relation with at least one transmission scheme and scrambling code identification n indicated by network equipmentSCIDAnd sequence identificationCorresponding relationship of
Figure BDA0001745512570000176
The parameter sets corresponding to the various transmission schemes, i.e. the correspondence of at least one parameter set to at least one transmission scheme, are determined.
Implementation 4, sequence identification
Figure BDA0001745512570000177
The corresponding relation with the transmission scheme can be defined by a protocol or configured by network equipment, and the scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000178
The correspondence of (a) may be determined by the network device.
In particular, the protocol may predefine at least one sequence identification
Figure BDA0001745512570000179
Corresponding relation with at least one transmission scheme, or network equipment can be configured with at least one sequence identification in advance
Figure BDA00017455125700001710
Corresponding relation with at least one transmission scheme, each transmission scheme can correspond to one or more sequence identifications
Figure BDA00017455125700001711
In addition, the network device can configure the scrambling code identifier n in advance through high-level signalingSCIDAnd sequence identification
Figure BDA00017455125700001719
The corresponding relationship of (1). For example, it may be configured through an existing RRC message.
The first terminal device may identify at least one sequence defined according to a protocolCorresponding relation with at least one transmission scheme and scrambling code identification n indicated by network equipmentSCIDAnd sequence identification
Figure BDA00017455125700001713
The parameter sets corresponding to the various transmission schemes, that is, the correspondence between at least one parameter set and at least one transmission scheme, are determined.
When the corresponding relation between the DMRS sequence and the data transmission scheme satisfies the condition, the network equipment can indicate the scrambling code identifier n used for generating the initial value of the first DMRS sequence through signalingSCIDAnd/or sequence identificationOptionally, before step 220, the method 200 further comprises: step 240, the network device sends second indication information, where the second indication information is used to indicate the scrambling code identifier n of the initial value for generating the first DRMS sequenceSCIDAnd/or sequence identification
Figure BDA00017455125700001715
Also, the signaling may be used to indirectly indicate the transmission scheme of the first data.
Accordingly, in step 240, the first terminal device receives the second indication information.
Specifically, when the parameter set of the initial value of the first DRMS sequence has a correspondence relationship with the transmission scheme, the second indication information may be used to indicate the scrambling code identification n corresponding to the transmission scheme of the first dataSCIDAnd/or sequence identification
Figure BDA00017455125700001716
So that the first terminal device identifies n according to the indicated scrambling codeSCIDAnd/or sequence identification
Figure BDA00017455125700001717
A first DMRS sequence is generated. The terminal device may further determine a corresponding transmission scheme according to the correspondence described in the first case and the parameter indicated by the second indication information, where the transmission scheme is a transmission scheme of the first data.
The network device may also directly indicate the transmission scheme of the first data through signaling, and the first terminal device may determine, according to the transmission scheme of the first data and the correspondence described in case one, the scrambling code identifier n used for generating the initial value of the first DMRS sequenceSCIDAnd/or sequence identificationOptionally, the method further comprises: the network device sends fourth indication information, wherein the fourth indication information is used for indicating the transmission scheme of the first data. Accordingly, the first terminal device receives the fourth indication information.
Case two, the generation formula for generating the initial value of the DMRS sequence corresponds to the transmission scheme:
case two defaults that a parameter set used to generate an initial value of a DMRS sequence has no correspondence with a transmission scheme. I.e. no discrimination of scrambling code identities n for different transmission schemesSCIDAnd sequence identification
Figure BDA0001745512570000181
In other words, for different transmission schemes, it can be assumed that the same scrambling code identity n is usedSCIDAnd sequence identification
Figure BDA0001745512570000182
The scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000184
For example, the multiple sequence identifications can be configured by the network device, e.g., by higher layer signaling
Figure BDA0001745512570000183
And indicating the scrambling code identifier n currently used through DCISCID
In particular, the protocol may default to one formula for generating initial values for each transmission scheme. For example, when the communication system transmits data with different terminal devices using transmission schemes such as TS1, SFTD, and STTD, the protocol may define in advance a formula for generating an initial value corresponding to each transmission scheme. For example, when the transmission scheme is TS1, the formula for generating the initial value may be, for example, formula two listed above; when the transmission scheme is SFTD or STTD, the formula for generating the initial value may be, for example, another formula different from formula two, such as formula three or formula four listed below:
the formula III is as follows:
Figure BDA0001745512570000185
the formula four is as follows:
Figure BDA0001745512570000186
the first terminal device may store the correspondence in advance according to the correspondence between the at least one generating equation and the at least one transmission scheme defined by the protocol.
When the corresponding relationship between the DMRS sequences and the data transmission schemes satisfies the second condition, the network device may also indicate a generation formula for generating the initial value of the first DMRS sequence through signaling. Optionally, before step 220, the method 200 further comprises: in step 250, the network device sends third indication information, where the third indication information indicates a generating formula used for generating an initial value of the first DRMS sequence, so that the first terminal device generates the first DMRS sequence according to the generating formula, and may determine a corresponding transmission scheme, where the transmission scheme is a transmission scheme of the first data. Also, the signaling may be used to indirectly indicate the transmission scheme of the first data.
Accordingly, in step 250, the first terminal device receives the third indication information.
Specifically, when the generation expression of the initial value of the first DRMS sequence has a correspondence relationship with the transmission scheme, the second indication information may be used to indicate the generation expression corresponding to the transmission scheme of the first data, so that the first terminal device generates the first DMRS sequence according to the indicated generation expression of the initial value. The terminal device may further determine a corresponding transmission scheme according to the correspondence described in the second case and the generation formula indicated by the third indication information, where the transmission scheme is a transmission scheme of the second data.
The network device may also directly indicate the transmission scheme of the first data through signaling, and the first terminal device may determine a generation formula for generating the initial value of the first DMRS sequence according to the transmission scheme of the first data and the correspondence described in case two. Optionally, the method further comprises: the network device sends fourth indication information, wherein the fourth indication information is used for indicating the transmission scheme of the first data. Accordingly, the first terminal device receives the fourth indication information.
Case three, the parameter set used for generating the initial value and the generating formula of the initial value may both correspond to the transmission scheme:
specifically, when the parameter set used to generate the initial value and the generation formula both correspond to the transmission scheme, the first terminal device may determine the parameter set corresponding to each transmission scheme according to one of the four possible implementations shown in case one. Further, the first terminal device may also determine the generation expression of the initial value corresponding to each transmission scheme in the manner shown in case two. It should be understood that the above shows several possible scenarios of DMRS sequence corresponding to a transmission scheme for ease of understanding only, but this should not constitute any limitation to the present application. Other technical schemes for associating the DMRS sequence with the transmission scheme are all within the scope of the present application.
Thereafter, the first terminal device may determine a parameter set and/or a generation formula for generating initial values of the first DMRS sequence according to the transmission scheme of the first data. The transmission scheme of the first data may be informed by the network device, for example.
When the DMRS sequence and data transmission scheme satisfies condition three, the network device may also indicate, through signaling, a scrambling code identifier n used to generate an initial value of the first DMRS sequenceSCIDAnd/or sequence identification
Figure BDA0001745512570000191
Alternatively, a generation formula for generating an initial value of the first DMRS sequence is indicated by signaling.
Optionally, the method 200 further comprises: step 240, the network device sends second indication information, where the second indication information is used to indicate the scrambling code identifier n of the initial value for generating the first DRMS sequenceSCIDAnd/or sequence identification
Figure BDA0001745512570000192
Accordingly, in step 240, the first terminal device receives the second indication information. The first terminal device may determine a scrambling code identity n for generating an initial value of the first DMRS sequence based on the received second indication informationSCIDAnd/or sequence identification
Figure BDA0001745512570000199
As already explained above, this second indication information may also be used to indirectly indicate the transmission scheme of the first data. After the first terminal device determines the transmission scheme of the first data based on the correspondence described in the first case and the parameter indicated by the second indication information, a generator for generating an initial value of the first DMRS sequence may be further determined based on the correspondence described in the second case.
Optionally, the method 200 further comprises: in step 250, the network device transmits third indication information, where the third indication information is used to indicate a generation formula for generating an initial value of the second DMRS sequence. Accordingly, in step 250, the first terminal device receives the third indication information. The first terminal device may determine a generation formula for generating an initial value of the first DMRS sequence based on the received third indication information. As already explained above, this third indication information may also be used to indirectly indicate the transmission scheme of the first data. After the first terminal device determines the transmission scheme of the first data based on the correspondence described in the second case and the generation formula indicated by the third indication information, it may further determine, based on the correspondence described in the first case, a scrambling code identifier n used for generating an initial value of the first DMRS sequenceSCIDAnd/or sequence identification
Optionally, the network device sends the second indication information and the third indication information to the first terminal device. Accordingly, the first terminal device receives the second indication information and the third indication information. The first terminal equipment can directly determine the scrambling code identifier n used for generating the initial value of the first DMRS sequence according to the received second indication informationSCIDAnd/or sequence identification
Figure BDA0001745512570000197
And may determine a generation formula for generating an initial value of the first DMRS sequence directly according to the received third indication information. Further, the first terminalThe end device may also determine a transmission scheme of the first data based on the second indication information or the third indication information.
Optionally, the network device sends the fourth indication information to the first terminal device. Accordingly, the first terminal device receives the fourth indication information. The first terminal device may determine, according to the transmission scheme indicated by the fourth indication information and the correspondence described in case one, a scrambling code identifier n used for generating an initial value of the first DMRS sequenceSCIDAnd/or sequence identification
Figure BDA0001745512570000196
And may determine a generation formula for generating an initial value of the first DMRS sequence according to the transmission scheme indicated by the fourth indication information and the correspondence described in case two.
Therefore, when the correspondence relationship between the DMRS sequences and the transmission schemes of the data satisfies the above-described condition, the network device may indicate the generation formula for generating the initial value of the first DMRS sequence, the scrambling code identifier n, only by any one of the second indication information or the fourth indication informationSCIDAnd sequence identification
Figure BDA0001745512570000193
And a transmission scheme of the first data. When the correspondence relationship between the DMRS sequence and the data transmission scheme satisfies the second condition, the network device may indicate the generation formula of the initial value for generating the first DMRS sequence and the scrambling identifier n only by any one of the third indication information and the fourth indication informationSCIDAnd sequence identification
Figure BDA0001745512570000195
And a transmission scheme of the first data. When the transmission scheme of the DMRS sequence and the data satisfies the third condition, the network device may indicate the generation formula of the initial value for generating the first DMRS sequence, the scrambling code identifier n, only by any one of the second indication information, the third indication information, or the fourth indication informationSCIDAnd sequence identification
Figure BDA0001745512570000194
And a transmission scheme of the first data.
It should be understood that the second indication information, the third indication information, and the fourth indication information listed above may be carried in DCI, for example, and the first terminal device may estimate the channel based on the received first DMRS sequence and the first DMRS sequence generated by itself after receiving the DCI and determining the transmission scheme of the first data and the corresponding parameter set and the generation formula of the initial value for generating the initial value of the first DMRS sequence.
As will be understood by those skilled in the art, if the first DMRS sequence transmitted by the network device is denoted as vector y and the first DMRS sequence generated by the first terminal device itself is denoted as vector x, the following relationship may be satisfied between the first DMRS sequence transmitted by the network device and the first DMRS sequence generated by the first terminal device itself:
y=Hx+n。
where H denotes the equivalent channel matrix and n denotes the receiver noise. It can be readily seen that the receiver noise n has an effect on the received signal. Since various schemes exist in the prior art for eliminating the above noise, in the embodiment of the present application, for convenience of description, it is assumed that the receiver noise is zero, i.e., the signal is transmitted without error. According to the above relationship, the first terminal device may estimate an equivalent channel matrix according to the received first DMRS sequence and the first DMRS sequence generated by itself, thereby further demodulating data.
It should be noted that, when the first terminal device estimates the equivalent channel matrix according to the received first DMRS sequence and the first DMRS sequence generated by the first terminal device, the first terminal device may respectively estimate an equivalent channel vector based on the DMRS sequences on the respective ports, and then construct the equivalent channel matrix based on the transmission scheme and the equivalent channel vectors on the respective ports.
Since the first terminal device does not know whether the network device transmits other signals on the transmission resource of the first data, in order to ensure better reception quality, the first terminal device may receive other signals, such as a noise signal, on the time-frequency resource where the first data is transmitted, or DMRS sequences of data transmitted to other terminal devices (e.g., denoted as second terminal devices) while receiving the first DMRS and the first data. For ease of distinction and explanation, data transmitted by the network device to the second terminal device may be referred to as second data, and a DMRS sequence transmitted by the network device to the second terminal device may be referred to as a second DMRS sequence.
The network device may indicate in advance, for example, by DCI, a time-frequency resource for transmitting the DMRS sequence, which may include, for example, an OFDM symbol transmitting a preamble (front-loaded) DMRS sequence and an additional (additional) DMRS sequence, or an OFDM symbol transmitting the DMRS sequence. The first terminal device may receive a signal on time-frequency resources indicated by the network device for transmission of DMRS sequences, and determine whether to receive the second DMRS sequence based on a correlation of the second DMRS sequence to the received signal. If the second DMRS sequence is determined to be received, the second DMRS sequence and the second data may cause interference to reception of the first terminal device, and the first terminal device needs to further determine a transmission scheme of the second data and perform interference estimation to demodulate the first data.
A detailed description will be given below of a specific method by which the first terminal device determines whether the second DMRS sequence is received based on the correlation between the second DMRS sequence and the received signal, and determines a transmission scheme of the second data in the case where the second DMRS sequence is received.
The first terminal device may first estimate the interfering channel based on a channel estimation assuming that the second DMRS sequence is received. Specifically, the first terminal device may generate the second DMRS sequence based on each transmission scheme and the correspondence of the transmission scheme to the DMRS sequence according to traversing all possible transmission schemes, for example, TS1, SFTD, and STTD), the generated second DMRS sequence being the second DMRS sequence generated by the first terminal device based on the assumed transmission scheme. To facilitate differentiation from the second DMRS sequence transmitted by the network device, a DMRS sequence generated by the first terminal device based on the hypothesized transmission scheme may be referred to herein as the hypothesized second DMRS sequence. The first terminal device may estimate the interfering channel based on the hypothesized second DMRS sequence and the received signal according to the following formula:
Figure BDA0001745512570000211
wherein the content of the first and second substances,
Figure BDA0001745512570000212
an estimate value representing the interfering channel matrix is obtained,an estimate representing the channel between the first transmit antenna and the first receive antenna,
Figure BDA0001745512570000214
an estimate representing a channel between a first transmit antenna and a second receive antenna,
Figure BDA0001745512570000215
an estimate representing a channel between the second transmit antenna and the first receive antenna,an estimate of the channel between the second transmit antenna and the second receive antenna is indicated. y is11Representing the signal received by the first receive antenna on the 1 st RE, y12Representing the signal received by the second receiving antenna on the 1 st RE, y21Representing the signal received by the first receive antenna on the 2 nd RE, y22Indicating the signal received by the first receive antenna on the 2 nd RE. p is a radical of1DMRS sequence, p, representing a first DMRS port generated by a first terminal device2A DMRS sequence representing a second DMRS port generated by the first terminal device.
If the first terminal device generates the second DMRS sequence based on a certain assumed transmission scheme and substitutes the second DMRS sequence into the channel matrix calculated in formula five in the process of traversing the transmission scheme, for example, each element in the channel matrix is greater than or equal to a preset threshold value, it may be determined that the correlation between the second DMRS sequence generated based on the assumed transmission scheme and the received signal is high, which indicates that the assumed second DMRS sequence is close to the received signal, that is, the signal received by the first terminal device is the second DMRS sequence, and the transmission scheme guessed by the first terminal device is the transmission scheme of the second data.
In contrast, if the first terminal device generates the second DMRS sequence based on a certain assumed transmission scheme and substitutes the estimated value of the channel matrix calculated in formula five into the transmission scheme is low, for example, at least one element in the channel matrix approaches zero, or each element in the channel matrix is smaller than a preset threshold value, it may be determined that the correlation between the second DMRS sequence generated based on the transmission scheme of this time and the received signal is low, which indicates that the assumed second DMRS sequence is different from the received signal, that is, the transmission scheme of this time is not the transmission scheme of the second data.
If the first terminal device traverses all transmission schemes and the estimated values of the channel matrix calculated according to the above formula based on each transmission scheme are low, it may be determined that the correlation between the received signal and the second DMRS sequence generated based on each transmission scheme is low. This means that the first terminal device does not receive the second DMRS sequence, or that the network device does not transmit the second DMRS sequence and the second data, and the signal received by the first terminal device at this time may be noise only. I.e. the first terminal device is not interfered by other signals at this time.
Wherein, the first terminal device generating the hypothesized second DMRS sequence through various transmission schemes may be based on the following three cases:
in case one, the set of parameters used to generate the initial values corresponds to the transmission scheme:
the generation formula of the default initial value does not have a corresponding relationship with the transmission scheme. That is, the generation equations of the initial values are not distinguished for different transmission schemes. In other words, for different transmission schemes, it may be assumed that the same initial value of the generator is used. The generating equation may be, for example, a generating equation used in the prior art, such as equation two described above.
The first terminal device may traverse scrambling code identifiers n corresponding to various transmission schemesSCIDAnd sequence identification
Figure BDA0001745512570000223
And generating an initial value according to formula two listed above, and further generating a second DMRS sequence according to formula one.
Case two, the generation formula of the initial value corresponds to the transmission scheme:
case two defaults that a parameter set used to generate an initial value of a DMRS sequence has no correspondence with a transmission scheme. I.e. no discrimination of scrambling code identities n for different transmission schemesSCIDAnd sequence identification
Figure BDA0001745512570000224
In other words, for different transmission schemes, it can be assumed that the same scrambling code identity n is usedSCIDAnd sequence identification
Figure BDA0001745512570000225
The scrambling code identifier nSCIDAnd sequence identification
Figure BDA0001745512570000227
For example, the multiple sequence identifications can be configured by the network device, e.g., by higher layer signalingAnd indicating the scrambling code identifier n currently used through DCISCID
The first terminal device may traverse the generating formula of the initial values corresponding to the various transmission schemes to generate an initial value, and further generate a DMRS sequence according to the formula.
Case three, the parameter set used for generating the initial value and the generating formula of the initial value may both correspond to the transmission scheme:
the first terminal device may traverse parameter sets corresponding to various transmission schemes and generating formulas of the initial values, generate the initial values, and further generate the DMRS sequence according to the formulas.
It should be understood that the method for determining the correlation level of two signals based on the magnitude of the values in the estimated interference channel matrix listed above is only one possible implementation and should not constitute any limitation to the present application.
It should also be understood that the particular methods of correlating the two signals listed above are exemplary only and should not be construed as limiting the application in any way. The specific implementation manner of correlating the two signals is not limited in the present application.
In a case where the first terminal device determines that the second DMRS sequence is received, optionally, step 220 further includes: step 2202, the network device transmits a second DMRS sequence and second data. Accordingly, the first terminal device receives the second DMRS sequence and the second data.
In this embodiment, the first DMRS sequence and the second DMRS sequence may occupy the same time-frequency resource or may occupy different time-frequency resources. When the first DMRS sequence and the second DMRS sequence occupy the same time-frequency resource, the first DMRS sequence and the second DMRS sequence may be DMRS sequences of different ports transmitted by using, for example, Code Division Multiplexing (CDM), or may be two DMRS sequences of the same port. When the first and second DMRS sequences occupy different time-frequency resources, the first and second DMRS sequences may be DMRS sequences of different ports transmitted by a Frequency Division Multiplexing (FDM) or Time Division Multiplexing (TDM), for example.
After determining the transmission scheme of the second data, the first terminal device may estimate an interference noise covariance matrix based on the transmission scheme of the second data and demodulate the first data. Accordingly, step 230 may further comprise: the first terminal device demodulates the first data based on the first DMRS sequence and the second DMRS sequence to obtain an estimated value of the first data.
Those skilled in the art will appreciate that the interference covariance matrix constructed will differ due to the different processing of the signals under different transmission schemes.
For example, when the transmission scheme used by the network device to transmit the first data to the first terminal device using port #0 is TS1, and the transmission scheme used by the network device to transmit the second data to the second terminal device using port #1 is TS1, the first terminal device may estimate equivalent channel vectors corresponding to port #0 and port #1, respectively, from the received DMRSs corresponding to different ports, for example, denoted as TS1, respectivelyAndfurther, it may be determined that the interference noise covariance matrix corresponding to the port #1 is as follows according to the transmission scheme TS1 of the second data
Figure BDA0001745512570000231
For another example, when the transmission scheme used by the network device to transmit data to the first terminal device using port #0 is TS1 and the transmission scheme used by the network device to transmit data to the second terminal device using ports #1 and #2 is SFTD, the first terminal device may estimate equivalent channel vectors corresponding to port #0, port #1, and port #2, respectively, from DMRSs corresponding to different ports, for example, denoted as "TS" and "SFTD", respectively
Figure BDA0001745512570000232
And
Figure BDA0001745512570000233
since the transmission scheme used by the second terminal device for transmitting the second data is SFTD, the interference noise covariance matrix needs to be considered by combining two subcarriers of two ports, and if the signal obtained after layer mapping and Alamouti coding is represented as SFTD, the interference noise covariance matrix is considered as two subcarriers of two ports, and if the signal obtained after layer mapping and Alamouti coding is represented as SFTD, the interference noise covariance matrix is represented as SFTD
Figure BDA0001745512570000234
Then the two can be usedThe equivalent channel vectors corresponding to the two REs of each port (i.e., ports #1 and #2) are constructed to obtain the following matrix:
Figure BDA0001745512570000235
if order
Figure BDA0001745512570000236
The first terminal equipment can respectively obtain interference noise covariance matrixes E (a) according to equivalent channel vectors corresponding to the ports #1 and #20a0 H) And E (a)1a1 H)。
In summary, when the first terminal device receives the second DMRS sequence to perform interference estimation, if the transmission scheme of the second data can be known in advance, the interference noise covariance matrix can be determined directly according to the transmission scheme without traversing various transmission schemes to make blind guesses, so that the complexity of interference estimation of the terminal device can be greatly reduced.
After the first terminal device estimates an equivalent channel matrix based on the first DMRS sequence and constructs an interference noise covariance matrix based on the second DRMS sequence and the transmission scheme of the second data, the first terminal device may further obtain an estimated value according to the formula y ═ Hx + n
Figure BDA0001745512570000237
Where H denotes an equivalent channel matrix for the first data transmission, i.e., an equivalent channel matrix estimated from the first DMRS sequence,
Figure BDA0001745512570000239
representing an interference noise covariance matrix, i.e. an equivalent channel matrix estimated from the second DMRS sequence and an interference noise covariance matrix determined by the transmission scheme of the second data, y representing a signal received by the first terminal device, x representing the first data to be transmitted to the first terminal device, the interference noise covariance matrix being a function of the channel quality metric, the channel quality metric being a function of the channel quality metric
Figure BDA0001745512570000238
Representing an estimate of the first data x.
Thereafter, the first terminal device may demodulate the first data by a reception algorithm in the prior art based on the interference noise covariance matrix. By way of example and not limitation, the reception algorithm may be a Minimum Mean Square Error (MMSE) -Interference Rejection Combining (IRC) reception algorithm. Since the receiving algorithm for processing the received signal and the specific data demodulation process can be the same as those in the prior art, a detailed description of the specific process is omitted here for the sake of brevity.
It should be understood that the above listed first DMRS sequence, first data, second DMRS sequence and second data are only examples, and should not be construed as limiting the application in any way, and the network device may also generate and transmit more DMRS sequences and data, and the terminal device may also receive more interference from the DMRS sequences and data.
Based on the above technical solution, by establishing a corresponding relationship between the DMRS sequence and the transmission scheme, the first terminal device only needs to traverse the parameter sets and/or the generating equations of the initial values corresponding to the transmission schemes, and determines the transmission scheme of the second data according to the received second DMRS sequence, that is, may determine the transmission scheme of the second data in advance, and further may perform interference estimation and data demodulation according to the transmission scheme of the second data and the second DMRS sequence. In contrast to the prior art, the first terminal device no longer needs to traverse various transmission schemes to blindly detect the transmission scheme of the interfering data and repeatedly attempt data demodulation until the data demodulation is successful. Therefore, the calculation amount of the first terminal equipment can be greatly reduced, and the complexity of interference estimation of the first terminal equipment is also greatly reduced, so that the demodulation complexity is reduced.
It should be noted that the three cases listed above can greatly reduce the complexity of interference estimation. In contrast, the transmission scheme in case one and case two is related to only one of the parameter set or the generation of the initial value, and therefore, the amount of calculation is smaller and the complexity is lower than in case three.
The method for receiving and transmitting data according to the embodiment of the present application is described in detail above with reference to fig. 2. Hereinafter, the communication device according to the embodiment of the present application will be described in detail with reference to fig. 3 to 5.
Fig. 3 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in fig. 3, the communication device 500 may include a transceiver unit 510 and a processing unit 520.
In one possible design, the communication apparatus 500 may correspond to the terminal device in the above method embodiment, and may be the terminal device or a chip configured in the terminal device, for example.
Specifically, the communication apparatus 500 may correspond to the terminal device in the method 200 according to the embodiment of the present application, and the communication apparatus 500 may include a unit for executing the method executed by the terminal device in the method 200 in fig. 2. Also, the units in the communication apparatus 500 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 200 in fig. 2.
Wherein, when the communication apparatus 500 is used to execute the method 200 in fig. 2, the transceiver unit 510 may be configured to execute the steps 2201 and 2202 in the method 200 and at least one of the steps 240 and 250, and the processing unit 520 may be configured to execute the step 230 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.
It is also to be understood that the transceiving unit in the communication apparatus 500 may correspond to the transceiver 602 in the terminal device 600 shown in fig. 4, and the processing unit 520 in the communication apparatus 500 may correspond to the processor 601 in the terminal device 600 shown in fig. 4.
In another possible design, the communication apparatus 500 may correspond to the network device in the above method embodiment, and may be, for example, a network device or a chip configured in a network device.
Specifically, the communication apparatus 500 may correspond to the network device in the method 200 according to the embodiment of the present application, and the communication apparatus 500 may include a unit for executing the method executed by the network device in the method 200 in fig. 2. Also, the units in the communication apparatus 500 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 200 in fig. 2.
Wherein, when the communication apparatus 500 is used to execute the method 200 in fig. 2, the transceiver unit 510 may be used to execute the steps 2201 and 2202 in the method 300 and at least one of the steps 240 and 250, and the processing unit 520 may be used to execute the step 210 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.
It is also to be understood that the transceiver unit 510 in the communication apparatus 500 may correspond to the transceiver 720 in the network device 700 shown in fig. 5, and the processing unit 520 in the communication apparatus 500 may correspond to the processor 710 in the network device 700 shown in fig. 5.
Fig. 4 is a schematic structural diagram of a terminal device 600 according to an embodiment of the present application. As shown, the terminal device 600 includes a processor 601 and a transceiver 602. Optionally, the terminal device 600 further comprises a memory 603. Wherein, the processor 601, the transceiver 602 and the memory 603 can communicate with each other via the internal connection path to transmit control and/or data signals, the memory 603 is used for storing a computer program, and the processor 601 is used for calling and running the computer program from the memory 603 to control the transceiver 602 to transmit and receive signals. Optionally, the terminal device 600 may further include an antenna 604, configured to send uplink data or uplink control signaling output by the transceiver 602 by using a wireless signal.
The processor 601 and the memory 603 may be combined into a processing device, and the processor 601 is configured to execute the program code stored in the memory 603 to implement the above-described functions. In particular implementations, the memory 603 may be integrated into the processor 601 or may be separate from the processor 601.
When the program instructions stored in the memory 603 are executed by the processor 601, the processor 601 is configured to control the transceiver 602 to receive the DMRS sequence and the data, and demodulate the data based on the DMRS sequence to obtain an estimate of the data. Wherein the DMRS sequence is related to a transmission scheme of data.
Specifically, the terminal device 600 may correspond to the terminal device in the method 200 according to the embodiment of the present application, and the terminal device 600 may include a unit for executing the method executed by the terminal device in the method 200 in fig. 2. Also, the units in the terminal device 600 and the other operations and/or functions described above are respectively for implementing the corresponding flows of the method 200 in fig. 2.
The processor 601 may be configured to perform the actions implemented inside the terminal device described in the foregoing method embodiments, and the transceiver 602 may be configured to perform the actions transmitted to or received from the network device by the terminal device described in the foregoing method embodiments. Please refer to the description of the previous embodiment of the method, which is not repeated herein.
Optionally, the terminal device 600 may further include a power supply 605 for supplying power to various devices or circuits in the terminal device.
In addition to this, in order to make the functions of the terminal apparatus more complete, the terminal apparatus 600 may further include one or more of an input unit 606, a display unit 607, an audio circuit 608, a camera 609, a sensor 610, and the like, which may further include a speaker 6082, a microphone 6084, and the like.
Fig. 5 is a schematic structural diagram of a network device 700 according to an embodiment of the present application. As shown, the network device 700 includes a processor 710 and a transceiver 720. Optionally, the network device 700 further comprises a memory 730. The processor 710, the transceiver 720 and the memory 730 communicate with each other via the internal connection path to transmit control and/or data signals, the memory 730 is used for storing a computer program, and the processor 710 is used for calling and running the computer program from the memory 730 to control the transceiver 720 to transmit and receive signals.
The processor 710 and the memory 730 may be combined into a single processing device, and the processor 710 may be configured to execute the program codes stored in the memory 730 to implement the functions described above. In particular implementations, the memory 730 may be integrated with the processor 710 or may be separate from the processor 710.
The network device 700 may further include an antenna 740, configured to send the downlink data or the downlink control signaling output by the transceiver 720 through a wireless signal.
When the program instructions stored in the memory 730 are executed by the processor 710, the processor 710 is configured to generate the DMRS and control the transceiver 720 to transmit the DMRS and data. Wherein the DMRS sequence is related to a transmission scheme of data.
In particular, the network device 700 may correspond to the network device in the method 200 according to the embodiment of the present application, and the network device 700 may include a unit for performing the method performed by the network device in the method 200 in fig. 2. Moreover, each unit and the other operations and/or functions in the network device 700 are respectively for implementing the corresponding flow of the method 200 in fig. 2, and a specific process of each unit for executing the corresponding step has been described in detail in the above method embodiment, and is not described herein again for brevity.
The processor 710 may be configured to perform the actions described in the previous method embodiments that are implemented inside the network device, and the transceiver 720 may be configured to perform the actions described in the previous method embodiments that the network device transmits to or receives from the terminal device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.
It should be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
It will also be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can 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 Random Access Memory (RAM) are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct bus RAM (DR RAM).
According to the method provided by the embodiment of the present application, the present application further provides a computer program product, which includes: computer program code which, when run on a computer, causes the computer to perform the method in the embodiment shown in fig. 2.
According to the method provided by the embodiment of the present application, the present application also provides a computer readable medium storing program code, which when run on a computer, causes the computer to execute the method in the embodiment shown in fig. 2.
According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the foregoing one or more terminal devices and one or more network devices.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps 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.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
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 (29)

1. A method of receiving data, comprising:
receiving a demodulation reference signal (DMRS) sequence and data, wherein the DMRS sequence is related to a transmission scheme of the data;
and demodulating the data based on the DMRS sequence to obtain an estimated value of the data.
2. The method of claim 1, wherein a scrambling code identity n used to generate an initial value for a DMRS sequenceSCIDAnd sequence identification
Figure FDA0001745512560000011
Corresponds to at least one transmission scheme.
3. The method of claim 2, wherein the method further comprises:
receiving first indication information, where the first indication information is used to indicate a first mapping relationship, where the first mapping relationship includes any one of:
at least one scrambling code identity nSCIDA correspondence to at least one transmission scheme; or
At least oneIdentification of individual sequence
Figure FDA0001745512560000012
A correspondence to at least one transmission scheme; or
Scrambling code identification nSCIDAnd sequence identification
Figure FDA0001745512560000013
And at least one transmission scheme.
4. The method of claim 2 or 3, wherein the method further comprises:
receiving second indication information, wherein the second indication information is used for indicating a scrambling code identifier n used for generating an initial value of the DMRS sequenceSCIDAnd/or sequence identification
Figure FDA0001745512560000014
5. The method of claim 4, wherein the method further comprises:
determining a transmission scheme of the data based on the second indication information.
6. The method of claim 1, wherein at least one generator for generating initial values for the DMRS sequences corresponds to at least one transmission scheme.
7. The method of claim 6, wherein the method further comprises:
and receiving third indication information, wherein the third indication information is used for indicating a generating formula of the initial value of the DMRS sequence.
8. The method of claim 7, wherein the method further comprises:
determining a transmission scheme of the data based on the third indication information.
9. A method of transmitting data, comprising:
generating a demodulation reference signal (DMRS) sequence, wherein the DMRS sequence is related to a transmission scheme of data;
and transmitting the DMRS sequence and the data.
10. The method of claim 9, wherein a scrambling code identity n used to generate an initial value for a DMRS sequenceSCIDAnd sequence identification
Figure FDA0001745512560000015
Corresponds to at least one transmission scheme.
11. The method of claim 10, wherein the method further comprises:
sending first indication information, where the first indication information is used to indicate a first mapping relationship, where the first mapping relationship includes any one of:
at least one scrambling code identity nSCIDA correspondence to at least one transmission scheme; or
At least one sequence identifier
Figure FDA0001745512560000016
A correspondence to at least one transmission scheme; or
Scrambling code identification nSCIDAnd sequence identification
Figure FDA0001745512560000017
And at least one transmission scheme.
12. The method of claim 10 or 11, wherein the method further comprises:
sending second indication information, wherein the second indication information is used for indicating that the user is used for generatingScrambling code identification n of initial value of the DMRS sequenceSCIDAnd/or sequence identification
Figure FDA0001745512560000018
13. The method of claim 9, wherein at least one generator used to generate initial values for DMRS sequences corresponds to at least one transmission scheme.
14. The method of claim 13, wherein the method further comprises:
and transmitting third indication information, wherein the third indication information is used for indicating a generating formula of the initial value of the DMRS sequence.
15. A communications apparatus, comprising:
a transceiving unit, configured to receive a demodulation reference signal (DMRS) sequence and data, where the DMRS sequence is related to a transmission scheme of the data;
and the processing unit is used for demodulating the data based on the DMRS sequence to obtain an estimated value of the data.
16. The communications apparatus of claim 15, wherein a scrambling code identification n used to generate an initial value for a DMRS sequenceSCIDAnd sequence identification
Figure FDA0001745512560000021
Corresponds to at least one transmission scheme.
17. The communications apparatus as claimed in claim 16, wherein the transceiver unit is further configured to receive first indication information, where the first indication information is used to indicate the first mapping relationship, and the first mapping relationship includes any one of:
at least one scrambling code identity nSCIDCorresponding to at least one transmission schemeA relationship; or
At least one sequence identifier
Figure FDA0001745512560000022
A correspondence to at least one transmission scheme; or
Scrambling code identification nSCIDAnd sequence identification
Figure FDA0001745512560000023
And at least one transmission scheme.
18. The communications apparatus of claim 16 or 17, wherein the transceiver component is further configured to receive second indication information indicating a scrambling code identity n used for generating an initial value of the DMRS sequenceSCIDAnd/or sequence identification
Figure FDA0001745512560000024
19. The communications apparatus of claim 18, wherein the processing unit is further configured to determine a transmission scheme for the data based on the second indication information.
20. The communication apparatus of claim 15, wherein at least one generation formula for generating initial values for DMRS sequences corresponds to at least one transmission scheme.
21. The communications apparatus of claim 20, wherein the transceiver component is further configured to receive third indication information indicating a scrambling code identity n used for generating an initial value for the DMRS sequenceSCIDAnd/or sequence identification
Figure FDA0001745512560000025
22. The communications apparatus of claim 21, wherein the processing unit is further configured to determine a transmission scheme for the data based on the third indication information.
23. A communications apparatus, comprising:
a processing unit, configured to generate a demodulation reference signal DMRS sequence, where the DMRS sequence is related to a transmission scheme of data;
and a transceiver unit configured to transmit the DMRS sequence and the data.
24. The communications apparatus of claim 23, wherein a scrambling code identification n used to generate initial values for DMRS sequencesSCIDAnd sequence identification
Figure FDA0001745512560000026
Corresponds to at least one transmission scheme.
25. The communications apparatus as claimed in claim 24, wherein the transceiver unit is further configured to transmit first indication information, where the first indication information is used to indicate the first mapping relationship, where the first mapping relationship includes any one of:
at least one scrambling code identity nSCIDA correspondence to at least one transmission scheme; or
At least one sequence identifier
Figure FDA0001745512560000027
A correspondence to at least one transmission scheme; or
Scrambling code identification nSCIDAnd sequence identification
Figure FDA0001745512560000028
And at least one transmission scheme.
26. The communications apparatus of claim 24 or 25, wherein the transceiving unit is further configured to transmit second indication information indicating a scrambling code identity n used to generate the DMRS sequenceSCIDAnd/or sequence identification
Figure FDA0001745512560000031
27. The communications apparatus of claim 23, wherein the at least one generation formula for generating initial values for DMRS sequences corresponds to at least one transmission scheme.
28. The communications apparatus of claim 27, wherein the transceiver component is further configured to transmit third indication information indicating a generation formula of an initial value of the DMRS sequence.
29. A computer-readable 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 14.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021163923A1 (en) * 2020-02-19 2021-08-26 Nec Corporation Method, device and computer storage medium for communication
WO2022110087A1 (en) * 2020-11-28 2022-06-02 华为技术有限公司 Communication method and apparatus, and computer-readable storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104349491A (en) * 2013-08-08 2015-02-11 中兴通讯股份有限公司 PESCH (physical downlink shared channel) transmission method, system and network side equipment
US20170208568A1 (en) * 2016-01-19 2017-07-20 Samsung Electronics Co., Ltd Method and apparatus for frame structure for advanced communication systems
CN107689845A (en) * 2016-08-05 2018-02-13 华为技术有限公司 A kind of method of transmission of reference signals, relevant device and communication system
WO2018097582A1 (en) * 2016-11-22 2018-05-31 Samsung Electronics Co., Ltd. Method and apparatus for channel estimation and data decoding in wireless communication system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103905346B (en) * 2012-12-28 2017-11-17 华为技术有限公司 A kind of method and apparatus of interference signal processing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104349491A (en) * 2013-08-08 2015-02-11 中兴通讯股份有限公司 PESCH (physical downlink shared channel) transmission method, system and network side equipment
US20170208568A1 (en) * 2016-01-19 2017-07-20 Samsung Electronics Co., Ltd Method and apparatus for frame structure for advanced communication systems
CN107689845A (en) * 2016-08-05 2018-02-13 华为技术有限公司 A kind of method of transmission of reference signals, relevant device and communication system
WO2018097582A1 (en) * 2016-11-22 2018-05-31 Samsung Electronics Co., Ltd. Method and apparatus for channel estimation and data decoding in wireless communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021163923A1 (en) * 2020-02-19 2021-08-26 Nec Corporation Method, device and computer storage medium for communication
WO2022110087A1 (en) * 2020-11-28 2022-06-02 华为技术有限公司 Communication method and apparatus, and computer-readable storage medium

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