CN111435882B

CN111435882B - Data channel sending method and communication device

Info

Publication number: CN111435882B
Application number: CN201910028349.9A
Authority: CN
Inventors: 向铮铮; 郭文婷; 张锦芳; 苏宏家; 卢磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2021-10-01
Anticipated expiration: 2039-01-11
Also published as: CN111435882A; WO2020143797A1

Abstract

The embodiment of the application discloses a data channel sending method and a communication device, which relate to the field of communication and can support sidestream communication in a 5G communication system, such as D2D or V2X. The method comprises the steps that a first terminal device determines time domain symbols occupied by a data channel in a time slot, the maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, N is the number of the time domain symbols included by one time slot, the first terminal device determines the time domain symbols which bear demodulation reference signals (DMRS) in the time domain symbols occupied by the data channel, the DMRS is used for demodulating data borne by the data channel, the first time domain symbol in the time domain symbols occupied by the data channel bears data or the DMRS or an Automatic Gain Control (AGC) signal, and the first terminal device sends the data channel to a second terminal device.

Description

Data channel sending method and communication device

Technical Field

The embodiment of the present application relates to the field of communications, and in particular, to a data channel transmission method and a communication apparatus.

Background

Long Term Evolution (LTE) communication system, fifth generation (5)^thgeneration, 5G) communication system, supporting sidelink (sidelink) communication between devices, such as: device to device (D2D) communication, vehicle to all (V2X) communication, and so on, that is, the terminal devices may perform side-line communication by using the time-frequency resources configured for D2D communication.

In the LTE communication system, a data channel for performing sidelink communication transmission between terminal devices supports a time division multiplexing scenario of a data channel and a control channel or a frequency division multiplexing scenario of a data channel and a control channel. In a 5G communication system, hybrid multiplexing of a control channel and a data channel is supported, i.e., a portion of the data channel is time division multiplexed with the control channel and another portion of the data channel is frequency division multiplexed with the control channel. The data channel defined by the LTE communication system does not support a scene of hybrid multiplexing of a control channel and the data channel, and the data channel defined by the LTE communication system cannot be directly applied to the 5G communication system for direct communication among devices.

Disclosure of Invention

The embodiment of the application provides a data channel sending method and a communication device, which can support terminal equipment to carry out sidestream communication in a 5G communication system and ensure the reliability of data transmission.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, a data channel transmitting method is provided, including: the first terminal device determines a time domain symbol occupied by a data channel in a time slot. The maximum value of the number of time domain symbols occupied by the data channel is N-2 or N-1, and N is the number of time domain symbols included in one time slot. The first terminal device may further determine a time domain symbol carrying a DMRS in the time domain symbol occupied by the data channel, where the DMRS is used to demodulate data carried by the data channel, and a first time domain symbol in the time domain symbol occupied by the data channel carries data or a DMRS or an AGC signal. The first terminal device may transmit a data channel to the second terminal device.

In the method provided by the embodiment of the application, a time domain symbol occupied by a data channel in a time slot may not include an AGC and/or a guard interval, that is, the AGC and/or the guard interval may not be calculated into the duration of the data channel, so that when the position of the DMRS is determined according to the duration of the data channel, deviation is avoided, and the performance of the terminal device in decoding the DMRS can be improved. Therefore, the method provided by the embodiment of the application can still transmit the data channel for sidestream communication under the scene of PSSCH and PSCCH hybrid multiplexing (such as a 5G communication system), the performance of terminal equipment for decoding DMRS is not influenced, and the reliability of data transmission is ensured.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the first terminal device, the DMRS for the data channel includes: and determining the time domain symbol carrying the DMRS from the time domain symbols occupied by the data channel according to the number of the time domain symbols occupied by the data channel and the subcarrier interval of the data channel.

In the embodiment of the application, when determining the DMRS position in the data channel, the data channel may be regarded as a whole, and the DMRS position is determined according to a time domain symbol occupied by the data channel (i.e., a duration of the data channel), so that decoding the DMRS in the data channel can obtain a more accurate channel estimation result, and ensure reliability of data transmission.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the data channel is composed of a first data channel portion and a second data channel portion; the method for determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the data channel by the first terminal device includes: determining a time domain symbol carrying the DMRS in the time domain symbols occupied by the first data channel part according to the number of the time domain symbols occupied by the first data channel part and the subcarrier interval of the data channel; and determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel.

In the embodiment of the present application, when determining the DMRS position in the data channel, the data channel may be regarded as two parts, and the DMRS position is determined according to a time domain symbol (i.e., a duration of the data channel) occupied by each part. The data channel can be divided according to the actual distribution of the data channel, the DMRS is mapped reasonably, the performance of the terminal equipment for decoding the data channel can be ensured, and the reliability of data transmission is further ensured.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the first data channel portion is a portion of the data channel that overlaps with the frequency domain resources occupied by the control channel, and the second data channel portion is a portion of the data channel that does not overlap with the frequency domain resources occupied by the control channel; or, the first data channel part is a part of the data channel overlapped with the time domain resource occupied by the control channel, and the second data channel part is a part of the data channel not overlapped with the time domain resource occupied by the control channel.

In the embodiment of the present application, the data channel may be divided into two parts by using the frequency domain resource occupied by the control channel as a boundary, or the data channel may be divided into two parts by using the time domain resource occupied by the control channel as a boundary, so that the data channel may be reasonably divided according to the actual distribution of the data channel.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the determining, by the first terminal device, a time domain symbol carrying the DMRS in a time domain symbol occupied by the data channel includes: determining a time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel; the second data channel part is a part which is not overlapped with the time domain resource occupied by the control channel in the data channel; alternatively, the second data channel portion is a portion that does not overlap with the frequency domain resources occupied by the control channel in the data channel.

In the embodiment of the present application, the data channel may be divided into two parts by using the frequency domain resource occupied by the control channel as a boundary, or the data channel may be divided into two parts by using the time domain resource occupied by the control channel as a boundary. Furthermore, only the non-overlapping part of the data channel and the control channel frequency domain resource (or time domain resource) is considered when the DMRS is mapped, so that the overhead of the reference signal can be saved.

In a second aspect, a communications apparatus, comprising: the processing unit is used for determining time domain symbols occupied by a data channel in a time slot, wherein the maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, and N is the number of the time domain symbols included in one time slot; the processing unit is further configured to determine a time domain symbol carrying a demodulation reference signal DMRS in the time domain symbol occupied by the data channel, where the DMRS is used to demodulate data carried by the data channel, and a first time domain symbol in the time domain symbol occupied by the data channel carries data or the DMRS or an automatic gain control AGC signal; a communication unit for transmitting the data channel to the second terminal device.

In the embodiment of the application, a time domain symbol occupied by a data channel sent by a terminal device on a time slot may not include an AGC and/or a guard interval, that is, the AGC and/or the guard interval may not be calculated into the duration of the data channel, so that when the position of a DMRS is determined according to the duration of the data channel, deviation is avoided, and the performance of the terminal device in decoding the DMRS can be improved. Therefore, the method provided by the embodiment of the application can still transmit the data channel for sidestream communication under the scene of PSSCH and PSCCH hybrid multiplexing (such as a 5G communication system), the performance of terminal equipment for decoding DMRS is not influenced, and the reliability of data transmission is ensured.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the processing unit is specifically configured to determine, according to the number of time domain symbols occupied by the data channel and a subcarrier interval of the data channel, a time domain symbol carrying the DMRS from the time domain symbols occupied by the data channel.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the data channel is composed of a first data channel portion and a second data channel portion; the processing unit is specifically configured to determine, according to the number of time domain symbols occupied by the first data channel portion and a subcarrier interval of the data channel, a time domain symbol carrying the DMRS in the time domain symbols occupied by the first data channel portion; and determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the first data channel portion is a portion of the data channel that overlaps with the frequency domain resources occupied by the control channel, and the second data channel portion is a portion of the data channel that does not overlap with the frequency domain resources occupied by the control channel; or, the first data channel part is a part of the data channel overlapped with the time domain resource occupied by the control channel, and the second data channel part is a part of the data channel not overlapped with the time domain resource occupied by the control channel.

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the processing unit is specifically configured to determine, according to the number of time domain symbols occupied by the second data channel portion and a subcarrier interval of the data channel, a time domain symbol that carries the DMRS in the time domain symbols occupied by the second data channel portion; the second data channel part is a part which is not overlapped with the time domain resource occupied by the control channel in the data channel; alternatively, the second data channel portion is a portion that does not overlap with the frequency domain resources occupied by the control channel in the data channel.

In a third aspect, a communications apparatus, comprising:

the processor is used for determining time domain symbols occupied by a data channel in a time slot, wherein the maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, and N is the number of the time domain symbols included in one time slot; the processor is further configured to determine a time domain symbol carrying a demodulation reference signal DMRS in a time domain symbol occupied by the data channel, where the DMRS is used to demodulate data carried by the data channel, and a first time domain symbol in the time domain symbol occupied by the data channel carries data or the DMRS or an automatic gain control AGC signal; a transceiver for transmitting the data channel to the second terminal device.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the processor is specifically configured to determine, according to the number of time domain symbols occupied by the data channel and a subcarrier interval of the data channel, a time domain symbol carrying the DMRS from the time domain symbols occupied by the data channel.

With reference to the third aspect, in a second possible implementation manner of the third aspect, the data channel is composed of a first data channel portion and a second data channel portion; the processor is specifically configured to determine, according to the number of time domain symbols occupied by the first data channel portion and a subcarrier interval of the data channel, a time domain symbol carrying the DMRS in the time domain symbols occupied by the first data channel portion; and determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the first data channel portion is a portion of the data channel that overlaps with the frequency domain resources occupied by the control channel, and the second data channel portion is a portion of the data channel that does not overlap with the frequency domain resources occupied by the control channel; or, the first data channel part is a part of the data channel overlapped with the time domain resource occupied by the control channel, and the second data channel part is a part of the data channel not overlapped with the time domain resource occupied by the control channel.

With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the processor is specifically configured to determine, according to the number of time domain symbols occupied by the second data channel portion and a subcarrier interval of the data channel, a time domain symbol that carries the DMRS in the time domain symbols occupied by the second data channel portion; the second data channel part is a part which is not overlapped with the time domain resource occupied by the control channel in the data channel; alternatively, the second data channel portion is a portion that does not overlap with the frequency domain resources occupied by the control channel in the data channel.

In a fourth aspect, a computer-readable storage medium is disclosed, comprising: the computer readable storage medium has instructions stored therein; when the computer-readable storage medium runs on the first terminal device according to the second aspect and any one of the implementation manners of the second aspect, the third aspect and any one of the implementation manners of the third aspect, the first terminal device is caused to perform the data channel transmission method according to the first aspect and any one of the implementation manners of the first aspect.

In a fifth aspect, a communication device is disclosed, comprising: the communication device stores instructions; when the communication apparatus is run on the first terminal device according to any one of the second aspect and the second implementation manner, the third aspect and the third implementation manner, the first terminal device is caused to perform the communication method according to any one of the first aspect and the first implementation manner, and the communication apparatus may be a chip.

Drawings

Fig. 1 is an architecture diagram of a communication system provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a PSCCH and PSCCH multiplexing mode in an LTE communication system;

fig. 3 is a schematic diagram of a psch format in an LTE communication system;

fig. 4 is a schematic diagram of a PSCCH and PSCCH multiplexing scheme in a 5G communication system;

fig. 5 is a block diagram of a communication device according to an embodiment of the present invention;

fig. 6 is a schematic flowchart of a data channel transmission method according to an embodiment of the present invention;

fig. 7 is another schematic diagram of a PSCCH and PSCCH multiplexing scheme in a 5G communication system;

fig. 8 is a schematic diagram of DMRS mapping provided in an embodiment of the present invention;

fig. 9 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 10 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 11 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 12 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 13 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 14 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 15 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 16 is a schematic diagram of another DMRS mapping provided in an embodiment of the present invention;

fig. 17 is another block diagram of a communication device according to an embodiment of the present invention;

fig. 18 is another block diagram of a communication device according to an embodiment of the present invention.

Detailed Description

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

The method provided by the embodiment of the application can be used for the communication system shown in fig. 1. Referring to fig. 1, the communication system may include a plurality of terminal devices and an access network device.

The access network device may be a base station, and the terminal device (terminal) may be referred to as a User Equipment (UE). Uplink and downlink transmission can be performed between the access network device and the terminal device through a cellular link, and the terminal device supports a sidelink (sidelink) communication technology between the terminal devices, such as D2D communication, V2X communication, Machine Type Communication (MTC), and the like. The terminal in the embodiment of the present application may include, but is not limited to, a vehicle-mounted terminal, a mobile phone (mobile phone), a tablet computer or a computer with a wireless transceiving function, an intelligent gas station, an intelligent signal lamp, and the like.

When performing sidelink communication between terminal equipments, control information is transmitted via a Physical Sidelink Control Channel (PSCCH), and data is transmitted via a physical sidelink shared channel (PSCCH). In addition, the psch includes a demodulation reference signal (DMRS) so that the user can correctly receive data in the psch. The terminal device may demodulate data in the PSSCH in accordance with the DMRS in the PSSCH.

Referring to fig. 2, in the LTE communication system, the PSCCH and PSCCH are multiplexed in a single manner, that is, the PSCCH and PSCCH are time division multiplexed, or the PSCCH and PSCCH are frequency division multiplexed. In addition, the format of the psch in the LTE communication system is shown in fig. 3. Referring to fig. 3, the psch occupies one sub-frame (e.g., a sub-frame including 14 OFDM symbols) in the time domain. Wherein, there are 4 time domain symbols containing DMRS, the first time domain symbol of the psch carries AGC, and the last time domain symbol of the psch is a guard interval. The transmitting terminal equipment transmits PSSCH to the receiving terminal equipment, which can perform transceiving conversion at a guard interval.

It should be noted that the "time domain symbol" in the embodiment of the present invention may include, but is not limited to, any of the following: orthogonal Frequency Division Multiplexing (OFDM) symbols, discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM), universal filtered multi-carrier (mc) symbols, filter bank multi-carrier (FBMC) symbols, Generalized Frequency Division Multiplexing (GFDM) symbols, and so on.

In 5G communication systems and other possible future communication systems, the PSCCH and PSCCH may be multiplexed in a mixed manner, i.e. a portion of the PSCCH and PSCCH is time division multiplexed and another portion of the PSCCH and PSCCH is frequency division multiplexed. For example, referring to fig. 4, the pschs include psch 1 and psch 2. The PSSCH1 and the PSCCH are frequency division multiplexed, and the PSSCH2 and the PSCCH are time division multiplexed. In this scenario, the psch may not contain either the AGC or the guard interval, or neither the AGC nor the guard interval. It should be noted that the distribution of pschs and PSCCHs in a 5G communication system is not limited to the form shown in fig. 4, and fig. 4 is only one possible hybrid multiplexing scenario.

The PSCCH shown in fig. 3 only supports a scenario in which the PSCCH and the PSCCH are multiplexed in a single manner, and the PSCCH shown in fig. 3 cannot be directly applied to a 5G communication system for sidelink communication. Specifically, when transmitting the psch, the terminal device determines the DMRS position (i.e., the time domain position in the psch to which the DMRS is mapped) from the psch duration (duration) and the subcarrier spacing of the psch. The psch shown in fig. 3 contains the AGC and guard interval, i.e., the AGC and guard interval are counted within the psch duration when determining the DMRS location.

However, in other scenarios supporting psch and PSCCH hybrid multiplexing, the psch may not include AGC or guard interval, or the psch may not include AGC or guard interval. The actual distribution of PSSCH should be considered when determining DMRS position, AGC and/or guard interval do not need to be calculated within PSSCH duration, and if AGC and guard interval are calculated within PSSCH duration according to the definition of LTE communication system, the determined DMRS position will have deviation, thereby affecting the performance of terminal equipment for decoding DMRS. It can be seen that the psch defined in the LTE communication system cannot be directly applied to the 5G communication system for sidestream communication.

The embodiment of the invention provides a data channel sending method.A first terminal device determines a time domain symbol occupied by a data channel in a time slot, determines a time domain symbol bearing a DMRS in the time domain symbol occupied by the data channel, and can also send the data channel to a second terminal device. The maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, and N is the number of the time domain symbols included in one time slot. In addition, a first time domain symbol of the time domain symbols occupied by the data channel carries data or a DMRS or an AGC signal. In the embodiments of the present application, a time domain symbol occupied by a data channel in a time slot may not include an AGC and/or a guard interval, that is, the AGC and/or the guard interval may not be calculated into a duration of the data channel, so that when a position of a DMRS is determined according to the duration of the data channel, a deviation is avoided, and a performance of a terminal device in decoding the DMRS can be improved. Therefore, the method provided by the embodiment of the application can still transmit the data channel for sidestream communication under the scene of PSSCH and PSCCH hybrid multiplexing (such as a 5G communication system), the performance of terminal equipment for decoding DMRS is not influenced, and the reliability of data transmission is ensured.

Embodiments of the present invention may apply the data channel transmission method provided in the embodiments of the present invention to the communication apparatus shown in fig. 5, which may be a terminal device in the communication system shown in fig. 1. As shown in fig. 5, the communication device may include at least one processor 501, memory 502, transceiver 503, and communication bus 504.

The following describes each component of the communication apparatus in detail with reference to fig. 5:

the processor 501 is a control center of the communication apparatus, and may be a single processor or a collective term for a plurality of processing elements. For example, the processor 501 is a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (digital signal processors, DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

The processor 501 may perform various functions of the communication device by running or executing software programs stored in the memory 502, and calling up data stored in the memory 502, among other things.

In particular implementations, processor 501 may include one or more CPUs, such as CPU0 and CPU1 shown in fig. 5, in some embodiments.

In particular implementations, in some embodiments, a communication device may include multiple processors, such as processor 501 and processor 505 shown in fig. 5. Each of these processors may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). A processor herein may refer to one or more communication devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The memory 502 may be a read-Only memory (ROM) or other types of static storage communication devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage communication devices that can store information and instructions, an electrically erasable programmable read-Only memory (EEPROM), a compact disc read-Only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), but is not limited to, magnetic disk storage media or other magnetic storage communication devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 502 may be separate and coupled to the processor 501 via a communication bus 504. The memory 502 may also be integrated with the processor 501.

The memory 502 is used for storing software programs for implementing the present invention, and is controlled by the processor 501 for execution.

A transceiver 503 for communication with a second device. Of course, the transceiver 503 may also be used for communication with a communication network, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), and so on. The transceiver 503 may include a receiving unit to implement a receiving function and a transmitting unit to implement a transmitting function.

The communication bus 504 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.

The communication device configuration shown in fig. 5 does not constitute a limitation of the communication device and may include more or fewer components than those shown, or some of the components may be combined, or a different arrangement of components.

The embodiment of the invention provides a communication method which is suitable for a communication system shown in figure 1. As shown in fig. 6, the method comprises the steps of:

601. the first terminal device determines time domain symbols occupied by a data channel in a time slot, wherein the maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, and N is the number of the time domain symbols included in one time slot.

It should be noted that, a first time domain symbol in the time domain symbols occupied by the data channel carries data or the DMRS or AGC signal. The data channel may not include the AGC signal or the guard interval, or the data channel may not include the AGC signal and the guard interval.

It is understood that the data channel does not include the AGC signal, i.e., the time domain symbols carrying the AGC signal are not counted for the data channel duration (psch duration); the data channel does not include a guard interval, i.e., the time domain symbols for the guard interval do not count for the duration of the data channel; the data channel does not include the AGC signal and the guard interval, i.e., neither the time domain symbols carrying the AGC signal nor the time domain symbols for the guard interval are counted in the data channel duration.

In addition, the time domain symbol may be an OFDM symbol or a DFT-s-OFDM symbol, and the data channel may be a PSSCH transmitted by the first terminal device for sidelink communications with other terminal devices.

In a 5G communication system, when a normal Cyclic Prefix (CP) is used, each slot contains 14 time domain symbols. In this scenario, N is 14 in the embodiment of the present invention, and the maximum value of the number of symbols occupied by the data channel in one slot is 13 or 12; with extended CP and subcarrier spacing of 60kHz, each slot contains 12 time domain symbols. In this scenario, N is 12 in the embodiment of the present invention, and the maximum value of the number of symbols occupied by the data channel in one slot is 11 or 10.

602. The first terminal equipment determines a time domain symbol carrying the DMRS in the time domain symbols occupied by the data channel.

In one possible implementation, the data channel includes data, DMRS, and AGC signals. It will be appreciated that the time domain symbol carrying the AGC signal is counted over the data channel duration and the first time domain symbol of the data channel carries the AGC signal, and the time domain symbols occupied by the data channel may be numbered starting with the time domain symbol carrying the AGC signal. For example, if the data channel includes time domain symbols numbered from "0", the time domain symbol carrying the AGC signal is the time domain symbol numbered 0 among the time domain symbols occupied by the data channel.

In one possible implementation, the data channel may not include the AGC signal. In this scenario, the time domain symbol carrying the AGC signal is not counted for the duration of the data channel, and the first time domain symbol of the data channel is not carried, e.g., the first time domain symbol of the data channel carries data or DMRS.

The DMRS is used for a data channel, and is used for demodulating data carried by the data channel. For example, a first terminal device transmits a psch to a second terminal device, and the second terminal device acquires a DMRS in the psch. The second terminal device can also perform channel estimation according to the acquired DMRS to determine the PSSCH sent by the first terminal device, and demodulate data in the PSSCH.

In addition, the AGC signal is used for automatic gain control. For example, the first terminal device transmits the psch to the second terminal device, the second terminal device acquires an AGC signal in the psch, and the second terminal device may adjust a parameter of its own amplification circuit according to the acquired AGC signal.

In the embodiment of the present invention, the first device may determine, in the time domain symbol occupied by the data channel in the time slot, the time domain symbol carrying the DMRS in the time domain symbol by using the following three methods, specifically including:

first, a first terminal device may determine a time domain symbol carrying a DMRS from time domain symbols occupied by a data channel according to the number of time domain symbols occupied by the data channel and a subcarrier interval of the data channel.

In this embodiment of the present invention, the first terminal device may further mix the multiplexing modes of the data channel and the control channel to the second terminal, where a part of the data channel is time division multiplexed with the control channel, and another part of the data channel is frequency division multiplexed with the control channel. In a first implementation, the data channel is taken as a whole, and the number M of time domain symbols occupied by the data channel in one time slot is determined. M is a positive integer of 1 or more and N-1 (or N-2) or less.

Further, the first terminal device may obtain a DMRS mapping rule configured by a network side device (e.g., a base station), and determine a DMRS position, that is, a time domain symbol carrying the DMRS in a time domain symbol occupied by the data channel, with reference to the DMRS mapping rule. Of course, the DMRS mapping rule may also be preconfigured, and the manner in which the first terminal device obtains the DMRS mapping rule is not limited in the embodiment of the present invention. The DMRS mapping rules indicate correspondence between time domain symbols occupied by the data channels, subcarrier intervals of the data channels, and DMRS positions. The maximum value of the number of time domain symbols occupied by the data channel indicated by the DMRS mapping rule in the embodiment of the invention is N-1 or N-2.

In one possible implementation, the DMRS mapping rules exist in the form of a DMRS mapping table. Specifically, the first terminal device may query the DMRS mapping table according to the number M of time domain symbols occupied by the data channel in one time slot and the subcarrier spacing of the data channel, and may determine the time domain symbol carrying the DMRS in the time domain symbols occupied by the data channel. It should be noted that the DMRS mapping table defines which time domain symbols in the time domain symbols occupied by the data channel are used to carry the DMRS at a specified subcarrier interval and a specified time domain symbol number. Table 1 below is a possible DMRS mapping table, where "subcarrier spacing H" is used to indicate a subcarrier spacing of a data channel, and "symbol number M occupied by psch" is used to indicate a number of time domain symbols occupied by the data channel in one time slot; the "DMRS location" is used to indicate an index of a time domain symbol carrying the DMRS in a time domain symbol occupied by the data channel. In one possible implementation, the index of the time domain symbol may be the number of the time domain symbol.

TABLE 1

For example, assume that a data channel occupies 12 time domain symbols in one slot, and the subcarrier spacing of the data channel is 30 KHz. Referring to table 1, when M is 12 and H is 30KHz, two DMRS positions are mapped, that is, 2 time domain symbols among the time domain symbols occupied by the data channel carry the DMRS. Wherein, the first time domain symbol carrying the DMRS is numbered 2 (i.e., the number is 2) in the time domain symbols occupied by the data channel

) The second time domain symbol carrying the DMRS is numbered 8 (i.e., the second time domain symbol in the time domain symbol occupied by the data channel) (i.e., the time domain symbol of (c) is numbered 8

) The time domain symbol of (2). Suppose that the time domain symbols occupied by the data channel are numbered from 0, the time domain symbol numbered 2 is the 3 rd time domain symbol in the time domain symbols occupied by the data channel, and the time domain symbol numbered 8 is the 9 th time domain symbol in the time domain symbols occupied by the data channel.

It should be noted that table 1 is only one possible DMRS mapping table, where DMRS positions are not limited to those shown in table 1, and may also be other possible DMRS positions. For example, when the subcarrier spacing H of the data channel is 30KHz, the time domain symbols occupied by the data channel are 1-6, and the look-up table 1 determines a DMRS position, i.e., the time domain symbols occupied by the data channel are numbered as

Of a time domain symbol. When the subcarrier interval H of the data channel is 30KHz, the time domain symbols occupied by the data channel are 1-6, and the corresponding DMRS positions are not limited to the time domain symbols occupied by the data channel but numbered as

The time domain symbol of (2) may also be other time domain symbols in the time domain symbols occupied by the data channel. Of course, there may be multiple DMRS positions, that is, there are multiple time domain symbols used for carrying the DMRSs in the time domain symbols occupied by the data channel.

Second, in a scenario where a data channel and a control channel are mixed and multiplexed, the data channel is composed of a first data channel part and a second data channel part. For example, referring to fig. 4, the data channels are divided according to a time domain resource of a control channel as a boundary, a first data channel portion is a portion of the data channel that overlaps with the time domain resource occupied by the control channel, and a second data channel portion is a portion of the data channel that does not overlap with the time domain resource occupied by the control channel. Illustratively, the PSSCH1 in FIG. 4 is the first data channel segment and the PSSCH2 is the second data channel segment.

Referring to fig. 7, the division is performed by taking the frequency domain resource of the control channel as a boundary, the first data channel portion is a portion of the data channel that overlaps with the frequency domain resource occupied by the control channel, and the second data channel portion is a portion of the data channel that does not overlap with the frequency domain resource occupied by the control channel. Illustratively, the PSSCH1 in FIG. 7 is the first data channel segment and the PSSCH2 is the second data channel segment.

In a second possible implementation manner, the determining, by the first terminal device, a time domain symbol carrying the DMRS in a time domain symbol occupied by the data channel includes:

and determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the first data channel part according to the number of the time domain symbols occupied by the first data channel part and the subcarrier interval of the data channel. In addition, the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part is determined according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel.

It should be noted that the DMRSs carried by the first data channel portion and the second data channel portion may be the same and are all the DMRSs described in step 602.

In some embodiments, the DMRSs carried by the first data channel portion and the second data channel portion may also be different, where the DMRS carried by the first data channel portion is referred to as a first DMRS, the DMRS carried by the second data channel portion is referred to as a second DMRS, and the first DMRS and the second DMRS jointly form the DMRS described in step 602.

The DMRSs are identical, which means that the sequences of the DMRSs are identical. For example, the DMRSs carried by the first data channel portion and the second data channel portion are the same, and the DMRS sequences carried by the first data channel portion and the second data channel portion may be considered to be the same. DMRS different means that sequences of DMRSs are different. For example, the DMRSs carried by the first data channel portion and the second data channel portion are different, and the DMRS sequences carried by the first data channel portion and the second data channel portion may be considered to be different.

In specific implementation, the DMRS mapping table is queried according to the number of time domain symbols occupied by the first data channel portion and the subcarrier spacing of the data channel, and the time domain symbol carrying the DMRS in the time domain symbols occupied by the first data channel portion is determined. And inquiring the DMRS mapping table according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel, and determining the time domain symbols carrying the DMRS in the time domain symbols occupied by the second data channel part.

It should be noted that the time domain symbols occupied by the first data channel portion and the time domain symbols occupied by the second data channel portion are separately numbered. The DMRS positions determined according to the number of time domain symbols occupied by the first data channel portion and the subcarrier spacing of the data channel are positions for the first data channel portion, and the DMRS positions determined according to the number of time domain symbols occupied by the second data channel portion and the subcarrier spacing of the data channel are positions for the second data channel portion. Illustratively, the first data channel portion occupies 5 time domain symbols, which are respectively numbered as 0, 1, 2, 3, and 4, and the second data channel portion occupies 6 time domain symbols, which are respectively numbered as 0, 1, 2, 3, 4, and 5. Assume that two DMRS positions are determined according to a subcarrier interval of a data channel and a number 5 of time domain symbols occupied by a first data channel portion, where the first DMRS position is a time domain symbol numbered 1 in the time domain symbols occupied by the first data channel portion, that is, a 2 nd time domain symbol in the first data channel portion. The second DMRS is located at 3 time-domain symbols of the time-domain symbols occupied by the first data channel portion, that is, at the 4 th time-domain symbol of the first data channel portion.

Assume that two DMRS positions are determined according to a subcarrier spacing of the data channel and a number 6 of time domain symbols occupied by the second data channel portion, where the first DMRS position is a 2 nd time domain symbol in the time domain symbols occupied by the second data channel portion, that is, a time domain symbol numbered 1 in the second data channel portion. The second DMRS location is the 5 th time domain symbol of the time domain symbols occupied by the second data channel portion, i.e., the time domain symbol numbered 4 in the second data channel portion.

And thirdly, determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel. The second data channel part is a part which is not overlapped with the time domain resource occupied by the control channel in the data channel; or, the second data channel part is a part which does not overlap with the frequency domain resource occupied by the control channel in the data channel. That is, when mapping the DMRS in the data channel, the first data channel portion may be disregarded, the first data channel portion being a portion of the data channel that overlaps with the frequency domain resources occupied by the control channel, or the first data channel portion being a portion of the data channel that overlaps with the time domain resources occupied by the control channel, and the DMRS may be mapped only in the second data channel portion, that is, only the second data channel portion in the data channel carries the DMRS. Therefore, in the third implementation manner, the time domain symbol determined by querying the DMRS mapping table according to the number of time domain symbols partially occupied by the second data channel and the subcarrier spacing of the data channel is a time domain symbol carrying the second DMRS in the time domain symbol partially occupied by the second data channel.

603. And the first terminal equipment sends the data channel to the second terminal equipment.

In the following, a data channel is taken as a psch and a control channel PSCCH are taken as examples to describe in detail several possible DMRS mapping manners in the data channel transmission method provided by the embodiment of the present invention, which are specifically as follows:

in a first possible implementation, the psch does not contain the AGC signal and the guard interval. Assuming a normal cyclic prefix, a slot contains 14 time domain symbols. The number M of time domain symbols occupied by the pscch in one slot is at most 12(14-2), and DMRS may be mapped to one or more of the time domain symbols occupied by the pscch with reference to table 1.

It should be noted that, if the DMRS position obtained according to the calculation method provided in table 1 is a negative number, it is assumed that the DMRS position is 0, i.e., the time domain symbol numbered 0 in the psch.

Illustratively, referring to fig. 8, the psch occupies 11 time domain symbols within one slot and the subcarrier spacing of the psch is 15 kHz. The PSSCH does not contain the AGC signal and the guard interval, which are not counted in the time domain symbols occupied by the PSSCH. In addition, the psch does not include an AGC signal, so the first time domain symbol of the time domain symbols occupied by the psch does not carry the AGC signal, and can be used to carry DMRS or data. For example, the first time domain symbol occupied by the psch, numbered from 0, is the time domain symbol numbered 0 in the psch, and the 11 time domain symbols occupied by the psch are numbered 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 in this order.

According to the M-11, H-15 kHz lookup table 1, there are 4 DMRS positions, that is, 4 time domain symbols among 11 time domain symbols occupied by the psch carry the DMRS. Wherein, the first time domain symbol carrying the DMRS is numbered 1 (i.e., the number is 1) in the time domain symbol occupied by the data channel

) Time domain symbol of (2), i.e. the PSSCH occupied in FIG. 8The time domain symbol of (a); the second time domain symbol carrying the DMRS is numbered 4 (i.e., the second time domain symbol is the time domain symbol occupied by the data channel) (i.e., the second time domain symbol carrying the DMRS is numbered 4

) The time domain symbol of (a), i.e. the 5 th time domain symbol occupied by the psch in fig. 8; the third time domain symbol carrying the DMRS is numbered 7 (i.e., the third time domain symbol is the time domain symbol occupied by the data channel)

) The time domain symbol of (2), i.e. the 8 th time domain symbol occupied by the psch in fig. 8; the fourth time domain symbol carrying the DMRS is a time domain symbol numbered 9 (i.e., 11-2) of the time domain symbols occupied by the data channel, that is, the 10 th time domain symbol occupied by the psch in fig. 8.

The DMRS in the psch may also be a preamble DMRS in a scene in which the psch does not include an AGC signal and a guard interval. Under the scene of adopting the preposed DMRS, if the PSSCH does not contain an AGC signal, the first time domain symbol in the time domain symbols occupied by the PSSCH is always used for bearing the DMRS. The embodiment of the invention also provides a mapping mode of the preposed DMRS, which refers to the following table 2:

TABLE 2

Referring to table 2, no matter what value is taken by the number M of the time domain symbols occupied by the subcarrier spacing H, PSSCH of the psch, the DMRS position always includes the time domain symbol numbered 0 in the time domain symbols occupied by the psch, that is, the first time domain symbol in the time domain symbols occupied by the psch is always used for carrying the DMRS.

In addition, other DMRS positions are not limited to those shown in table 2, and may also be other DMRS positions, which is not limited in this embodiment of the present invention. For example, when the subcarrier interval of the psch is 15KHz and the number of time domain symbols occupied by the psch is 4-6, looking up table 2 can obtain a time domain symbol with DMRS position 0 in the psch and a time domain symbol with DMRS position 3 in the psch. In the embodiment of the invention, the position of the DMRS is not limited, and the time domain symbol with the number of 0 in the PSSCH is ensured to be used for bearing the DMRS when the pre-DMRS is mapped. For example, when the subcarrier spacing of the psch is 15KHz and the number of time domain symbols occupied by the psch is 4-6, the DMRS positions may be a time domain symbol numbered 0 in the psch and a time domain symbol numbered 4 in the psch. Certainly, when the subcarrier interval of the PSSCH is 15KHz and the number of time domain symbols occupied by the PSSCH is 4-6, the DMRS position may also include more than 2 time domain symbols, which is not limited in the embodiment of the present invention.

Illustratively, referring to fig. 9, the psch occupies 12 time domain symbols within one slot and the subcarrier spacing of the psch is 30 kHz. The pscch does not contain the AGC signal and the guard interval, i.e. the AGC signal and the guard interval are not counted in the time domain symbols occupied by the pscch. In addition, the first time domain symbol in the time domain symbols occupied by the psch does not carry an AGC signal, and may be used to carry DMRS or data. For example, starting from 0, the first time domain symbol of the time domain symbols occupied by the psch is the time domain symbol numbered 0 of the psch, and the 12 time domain symbols occupied by the psch are numbered 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 in this order.

From the M-12, H-30 kHz look-up table 2, two DMRS positions can be obtained, that is, 2 time domain symbols among 12 time domain symbols occupied by the pscch carry the DMRS. Wherein, the first time domain symbol carrying the DMRS is a time domain symbol numbered 0 among the time domain symbols occupied by the data channel, that is, a time domain symbol of the 1 st occupied by the PSSCH in fig. 9; the second time domain symbol carrying the DMRS is a time domain symbol numbered 6 of the time domain symbols occupied by the data channel, that is, a 7 th time domain symbol occupied by the psch in fig. 9.

In a second possible implementation manner, the psch does not include a guard interval, the number M of time domain symbols occupied by the psch in a slot of a normal cyclic prefix is at most 13(14-1), and the DMRS may be mapped to one or more of the time domain symbols occupied by the psch with reference to table 3.

It should be noted that the psch does not include a guard interval, which is understood that the duration of the psch does not include the guard interval, i.e., the guard interval is not counted in the time domain symbols occupied by the psch.

TABLE 3

It should be noted that, if the DMRS positions obtained according to the calculation method provided in table 3 are negative numbers, it is considered that the value corresponding to the DMRS positions is 0, that is, the first DMRS position is a time domain symbol numbered 0 in the psch.

Illustratively, referring to fig. 10, the psch occupies 12 time domain symbols within one slot and the subcarrier spacing of the psch is 15 kHz. The pscch does not contain a guard interval, i.e., the guard interval is not counted in the time domain symbols occupied by the pscch. The psch includes an AGC signal, the time domain symbols occupied by the psch are numbered from the time domain symbols occupied by the AGC signal, for example, from 0, the time domain symbols occupied by the AGC signal are the time domain symbols numbered 0 in the psch, and the 12 time domain symbols occupied by the psch are numbered 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 in this order.

From the M-12, H-15 kHz look-up table 3, four DMRS positions can be obtained, that is, 4 time domain symbols among 12 time domain symbols occupied by the pscch carry the DMRS. Wherein, the first DMRS position is a time domain symbol numbered 1 in the time domain symbols occupied by the data channel, that is, a 2 nd time domain symbol occupied by the PSSCH in fig. 10; the second DMRS position is a time domain symbol numbered 4 of the time domain symbols occupied by the data channel, that is, a 5 th time domain symbol occupied by the psch in fig. 10; the third DMRS position is a time domain symbol numbered 7 of the time domain symbols occupied by the data channel, that is, an 8 th time domain symbol occupied by the psch in fig. 10; the fourth DMRS position is a time domain symbol numbered 10 of the time domain symbols occupied by the data channel, that is, an 11 th time domain symbol occupied by the psch in fig. 10.

In a scenario where the psch does not include a guard interval, the DMRS in the psch may also be a preamble DMRS. Under the scene of adopting the preposed DMRS, if the PSSCH contains an AGC signal, a first time domain symbol in time domain symbols occupied by the PSSCH is used for bearing the AGC signal, and a second time domain symbol in the time domain symbols occupied by the PSSCH is always used for bearing the DMRS. The embodiment of the invention also provides a mapping mode of the preposed DMRS, which refers to the following table 4:

TABLE 4

Referring to table 4, no matter what value is taken by the number M of the time domain symbols occupied by the subcarrier spacing H, PSSCH of the psch, the DMRS position always includes the time domain symbol numbered 1 in the time domain symbols occupied by the psch, that is, the first time domain symbol after the AGC signal is always used to carry the DMRS.

In addition, other DMRS positions are not limited to those shown in table 4, and may also be other DMRS positions, which is not limited in this embodiment of the present invention. For example, when the subcarrier interval of the psch is 15KHz and the number of time domain symbols occupied by the psch is 5 to 7, the time domain symbol with the DMRS position number 1 in the psch and the time domain symbol with the DMRS position number 4 in the psch can be obtained by looking up table 4. In the embodiment of the invention, the position of the DMRS is not limited, and the time domain symbol with the number of 1 in the PSSCH is ensured to be used for bearing the DMRS when the pre-DMRS is mapped. For example, when the subcarrier spacing of the psch is 15KHz and the number of time domain symbols occupied by the psch is 5 to 7, the DMRS positions may be a time domain symbol numbered 1 in the psch and a time domain symbol numbered 5 in the psch. Certainly, when the subcarrier interval of the PSSCH is 15KHz and the number of time domain symbols occupied by the PSSCH is 5 to 7, the DMRS position may also include more than 2 time domain symbols, which is not limited in the embodiment of the present invention.

Illustratively, referring to fig. 11, the psch occupies 13 time domain symbols within one slot and the subcarrier spacing of the psch is 30 kHz. The pscch contains the AGC signal but no guard interval, i.e. the guard interval is not counted in the time domain symbols occupied by the pscch. The time domain symbols occupied by the psch are numbered from the time domain symbols occupied by the AGC signal, for example, from 0, the time domain symbols occupied by the AGC signal are the time domain symbols numbered 0 in the psch, and the 12 time domain symbols occupied by the psch are numbered 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 in this order.

From M13, H30, look up table 4, two DMRS positions can be obtained, that is, 2 time domain symbols among 13 time domain symbols occupied by the pscch carry the DMRS. Wherein, the first DMRS position is a time domain symbol numbered 1 in the time domain symbols occupied by the data channel, that is, a 2 nd time domain symbol occupied by the PSSCH in fig. 11; the second DMRS position is the time domain symbol numbered 7 of the time domain symbols occupied by the data channel, i.e., the 8 th time domain symbol occupied by the pscch in fig. 11.

In a third possible implementation manner, when the PSCCH and the PSCCH are mixed and multiplexed, the PSCCH is divided into two parts by using a frequency domain resource occupied by the PSCCH as a boundary, and the DMRSs of each part are mapped respectively. For example, referring to fig. 12, the psch is divided into psch 1 and psch 2. Wherein, the PSCCH 1 overlaps with the frequency domain resource of the PSCCH, i.e. the first data channel portion according to the embodiment of the present invention; the PSCCH2 does not overlap with the frequency domain resources of the PSCCH, the second data channel portion, as described in embodiments of the present invention.

Further, suppose the subcarrier spacing of the psch is 30kHz, the psch 2 occupies 12 time domain symbols, the psch 1 occupies 8 time domain symbols, and the PSCCH occupies 4 time domain symbols. Referring to the mapping rule provided in table 1 above, for the psch 2, two DMRS positions can be obtained by looking up table 1 according to H-30 and M-12, and fig. 12 refers to a time domain symbol numbered 3 in psch 2 and a time domain symbol numbered 8 in psch 2, respectively. For the psch 1, two DMRS positions can be obtained by looking up table 1 with H-30 and M-8, and reference is made to fig. 12 for a time domain symbol numbered 2 in psch 1 and a time domain symbol numbered 5 in psch 1, respectively.

The time domain symbols included in the psch 1 and the psch 2 are respectively numbered, and are numbered from 0, for example. In addition, the time domain symbols carrying the DMRSs in the PSSCH1 and the PSSCH2 may or may not overlap in the time domain, which is not limited in the embodiment of the present invention.

In a fourth possible implementation manner, when the PSCCH and the PSCCH are mixed and multiplexed, the PSCCH is divided into two parts by using a time domain resource occupied by the PSCCH as a boundary, and the DMRSs of each part are mapped respectively. For example, referring to fig. 13, the psch is divided into psch 1 and psch 2. Wherein, the PSSCH1 overlaps with the time domain resource of the PSCCH, i.e. the first data channel portion according to the embodiment of the present invention; the PSCCH2 does not overlap the time domain resources of the PSCCH, the second data channel portion, as described in embodiments of the present invention.

Further, it is assumed that the subcarrier spacing of the psch is 30kHz, the psch 1 occupies 3 time domain symbols, the psch 2 occupies 9 time domain symbols, and the PSCCH occupies 3 time domain symbols. Referring to the mapping rule provided in table 1 above, for the psch 1, one DMRS position can be obtained by looking up table 1 according to H-30 and M-3, and referring to fig. 13, time domain symbols numbered 1 in psch 1 are respectively. For the psch 2, two DMRS positions can be obtained by looking up table 1 with H-30 and M-9, and reference to fig. 13 is a time domain symbol numbered 2 in psch 2 and a time domain symbol numbered 6 in psch 1, respectively.

In a fifth possible implementation manner, when the PSCCH and the PSCCH are mixed and multiplexed, the PSCCH is regarded as a whole to map the DMRS, but the time-frequency resources occupied by the PSCCH are skipped in the mapping process.

For example, referring to fig. 14, it is assumed that the subcarrier spacing is 30kHz, the PSCCH occupies 12 time domain symbols in its entirety, and the PSCCH occupies 4 time domain symbols. Referring to the mapping rule provided in table 1 above, two DMRS positions can be obtained by looking up table 1 according to H ═ 30kHz and M ═ 12, and referring to fig. 14, time domain symbols numbered 3 in the psch and time domain symbols numbered 8 in the psch are shown respectively. However, the time-frequency resources occupied by PSCCH are skipped when the DMRS is mapped on the time-domain symbol numbered 3.

Certainly, the DMRSs of the PSCCH are mapped separately, and at this time, the DMRSs included in the PSCCH may also be used for the PSCCH, that is, the PSCCH multiplexes the DMRSs of the PSCCH.

In a sixth possible implementation, when the PSCCH and PSCCH are mixed and multiplexed, the PSCCH is divided into two parts, namely, the PSCCH 1 and the PSCCH2, by taking the time resource occupied by the PSCCH as a boundary. Wherein, the PSSCH1 overlaps with the time domain resource of the PSCCH, i.e. the first data channel portion according to the embodiment of the present invention; the PSCCH2 does not overlap the time domain resources of the PSCCH, the second data channel portion, as described in embodiments of the present invention.

When the DMRS of the psch is mapped, the DMRS is mapped only on the psch 2 without considering the psch 1. For example, referring to fig. 15, it is assumed that the subcarrier spacing is 30kHz, the PSCCH 1 occupies 3 time domain symbols, the PSCCH2 occupies 9 time domain symbols, and the PSCCH occupies 3 time domain symbols. The DMRS is mapped on the psch 2 with reference to the mapping rule provided in table 1 above. From table 1, where H is 30 and M is 9, two DMRS positions are obtained, and referring to fig. 15, time domain symbols numbered 2 in psch 2 and time domain symbols numbered 6 in psch 2 are respectively.

In a seventh possible implementation, when the PSCCH and PSCCH are mixed and multiplexed, the PSCCH is divided into two parts, namely, psch 1 and psch 2, by taking the frequency source occupied by the PSCCH as a boundary. Wherein, the PSCCH 1 overlaps with the frequency domain resource of the PSCCH, i.e. the first data channel portion according to the embodiment of the present invention; the PSCCH2 does not overlap with the frequency domain resources of the PSCCH, the second data channel portion, as described in embodiments of the present invention.

When the DMRS of the psch is mapped, the DMRS is mapped only on the psch 2 without considering the psch 1. For example, referring to fig. 16, it is assumed that the subcarrier spacing is 30kHz, the PSCCH 1 occupies 9 time domain symbols, the PSCCH2 occupies 12 time domain symbols, and the PSCCH occupies 3 time domain symbols. The DMRS is mapped on the psch 2 with reference to the mapping rule provided in table 1 above. From table 1, where H is 30 and M is 12, two DMRS positions are obtained, and referring to fig. 16, time domain symbols numbered 3 in psch 2 and time domain symbols numbered 8 in psch 2 are respectively.

It should be noted that, in the third to seventh possible implementation manners, the terminal device may not only map the DMRS with reference to the mapping rule provided in table 1, but also map the DMRS with reference to another DMRS mapping table provided in the embodiment of the present invention, for example, any one of tables 2 to 3 is referred to map the DMRS. Of course, the terminal device may also refer to other forms of DMRS mapping tables to map the DMRS, which is not limited in this embodiment of the present invention.

In the method provided by the embodiment of the invention, when the PSSCH and the PSCCH are mixed and multiplexed, the DMRS can be reasonably mapped according to the time-frequency distribution of the PSSCH, the PSSCH decoding performance of the terminal equipment is improved, and the reliability of data transmission is ensured.

Fig. 17 is a schematic diagram showing a possible configuration of the communication device according to the above embodiment, in a case where each functional module is divided in correspondence with each function. The communication apparatus shown in fig. 17 may be a terminal device (e.g., a first terminal device) according to the embodiment of the present application, or may be a component of the terminal device that implements the method described above, or may be a chip applied to the terminal device. The Chip may be a System-On-a-Chip (SOC) or a baseband Chip having a communication function. As shown in fig. 17, the communication apparatus includes a processing unit 1701 and a communication unit 1702. The processing unit may be one or more processors and the communication unit may be a transceiver.

A processing unit 1701 to enable the communication device to perform steps 601, 602 in the above embodiments, and/or other processes for the techniques described herein.

A communication unit 1702 for supporting communication between the communication apparatus and other communication apparatuses, such as supporting the communication apparatus to perform step 603 in the above embodiments, and/or other processes for the techniques described herein.

It should be noted that all relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

For example, in the case of using an integrated unit, a schematic structural diagram of a communication device provided in an embodiment of the present application is shown in fig. 18. In fig. 18, the communication apparatus includes: a processing module 1801 and a communication module 1802. The processing module 1801 is used to control and manage the operation of the communication device, e.g., to perform the steps performed by the processing unit 1701, and/or to perform other processes for the techniques described herein. The communication module 1802 is configured to perform the steps performed by the communication unit 1702 described above, and support interaction between the communication apparatus and other devices, such as interaction with other terminal devices. As shown in fig. 18, the communication device may further include a storage module 1803, and the storage module 1803 is used for storing program codes and data of the communication device.

When the processing module 1801 is a processor, the communication module 1802 is a transceiver, and the storage module 1803 is a memory, the communication device is the communication device shown in fig. 5.

Through the description of the above embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above functions may be distributed by different functional modules according to needs, that is, the internal structure of the database access apparatus may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed database access apparatus and method may be implemented in other ways. For example, the above-described database access device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, multiple units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be an indirect coupling or communication connection through some interfaces, database access 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 be one physical unit or a plurality of physical units, that is, may be located in one place, or may be distributed in a plurality of different places. 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 integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip microcomputer, a chip, or the like) or a processor to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A data channel transmission method, comprising:

the method comprises the steps that a first terminal device determines time domain symbols occupied by a data channel in a time slot, the maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, the N-2 is the time domain symbol occupied by subtracting a time domain symbol occupied by a protection interval from the number of the time domain symbols included by one time slot, and then the time domain symbol occupied by an automatic gain control AGC signal is subtracted; the N-1 is the time domain symbol number included in one time slot minus one time domain symbol occupied by the guard interval;

the first terminal equipment determines a time domain symbol which carries a demodulation reference signal (DMRS) in the time domain symbols occupied by the data channel, wherein the DMRS is used for demodulating the data carried by the data channel, and the first time domain symbol in the time domain symbols occupied by the data channel carries data or the DMRS or the AGC;

and the first terminal equipment sends the data channel to second terminal equipment.

2. The method of claim 1, wherein the first terminal device determining the DMRS for the data channel comprises:

and determining the time domain symbol carrying the DMRS from the time domain symbols occupied by the data channel according to the number of the time domain symbols occupied by the data channel and the subcarrier interval of the data channel.

3. The method of claim 1, wherein the data channel is comprised of a first data channel portion and a second data channel portion;

the determining, by the first terminal device, a time domain symbol carrying a DMRS in a time domain symbol occupied by the data channel includes:

determining a time domain symbol carrying the DMRS in the time domain symbol partially occupied by the first data channel according to the number of the time domain symbols partially occupied by the first data channel and the subcarrier interval of the data channel; and determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel.

4. The method of claim 3, wherein the first data channel portion is a portion of the data channel that overlaps with frequency-domain resources occupied by a control channel, and wherein the second data channel portion is a portion of the data channel that does not overlap with frequency-domain resources occupied by the control channel; or the like, or, alternatively,

the first data channel part is a part of the data channel, which is overlapped with the time domain resources occupied by the control channel, and the second data channel part is a part of the data channel, which is not overlapped with the time domain resources occupied by the control channel.

5. The method of claim 1, wherein the first terminal device determines the time domain symbol carrying the DMRS among the time domain symbols occupied by the data channel, comprising:

determining a time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel;

the second data channel part is a part which is not overlapped with time domain resources occupied by a control channel in the data channel; or, the second data channel part is a part which does not overlap with the frequency domain resource occupied by the control channel in the data channel.

6. A communications apparatus, comprising:

the processing unit is used for determining time domain symbols occupied by a data channel in a time slot, wherein the maximum value of the number of the time domain symbols occupied by the data channel is N-2 or N-1, and N-2 is the time domain symbol occupied by subtracting a protection interval from the number of the time domain symbols included in one time slot and then subtracting a time domain symbol occupied by an automatic gain control AGC signal; the N-1 is the time domain symbol number included in one time slot minus one time domain symbol occupied by the guard interval;

the processing unit is further configured to determine a time domain symbol, which carries a demodulation reference signal DMRS, in the time domain symbol occupied by the data channel, where the DMRS is used to demodulate data carried by the data channel, and a first time domain symbol in the time domain symbol occupied by the data channel carries data or the DMRS or the AGC;

and the communication unit is used for sending the data channel to the second terminal equipment.

7. The communications apparatus as claimed in claim 6, wherein the processing unit is specifically configured to determine the time domain symbol carrying the DMRS from the time domain symbols occupied by the data channel according to the number of time domain symbols occupied by the data channel and a subcarrier spacing of the data channel.

8. The communications apparatus of claim 6, wherein the data channel is comprised of a first data channel portion and a second data channel portion;

the processing unit is specifically configured to determine, according to the number of time domain symbols partially occupied by the first data channel and the subcarrier spacing of the data channel, a time domain symbol that carries the DMRS in the time domain symbols partially occupied by the first data channel; and determining the time domain symbol carrying the DMRS in the time domain symbol occupied by the second data channel part according to the number of the time domain symbols occupied by the second data channel part and the subcarrier interval of the data channel.

9. The communications apparatus as claimed in claim 8, wherein the first data channel portion is a portion of the data channel that overlaps with frequency domain resources occupied by a control channel, and the second data channel portion is a portion of the data channel that does not overlap with frequency domain resources occupied by the control channel; or the like, or, alternatively,

10. The communications apparatus according to claim 6, wherein the processing unit is specifically configured to determine, according to the number of time domain symbols partially occupied by the second data channel and the subcarrier spacing of the data channel, a time domain symbol that carries the DMRS in the time domain symbols partially occupied by the second data channel;

11. A communications apparatus, comprising: one or more processors and one or more memories;

the one or more memories coupled to the one or more processors for storing computer program code, the computer program code comprising computer instructions which, when executed by the one or more processors, cause the apparatus to perform the data channel transmission method of any of claims 1-5.

12. A computer-readable storage medium having instructions stored therein; the instructions are for performing the data channel transmission method of any of claims 1-5.

13. A communications apparatus, comprising: instructions are stored in the communication device; when the communication apparatus is operated on a first terminal device, the communication apparatus is a chip, the first terminal device is caused to perform the data channel transmission method according to any one of claims 1 to 5.