CN113543327A

CN113543327A - Data sending and receiving method and device

Info

Publication number: CN113543327A
Application number: CN202010307975.4A
Authority: CN
Inventors: 张天虹; 黄海宁; 杨帆
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2021-10-22

Abstract

The embodiment of the application relates to a data sending and receiving method and a device, which are applied to data transmission of a sidelink, and the data sending method comprises the following steps: the first terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to the first information; wherein the first information is used to indicate one way of determining the number of symbols R from among M ways of determining the number of symbols R; the first terminal equipment determines the size of a transmission block of the first data according to the symbol number R; and the first terminal equipment sends the first data.

Description

Data sending and receiving method and device

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for transmitting and receiving data.

Background

5G mobile communication generally faces three application scenarios: enhanced mobile broadband communications (eMMB), large-scale internet of things (mtc), and ultra-reliable low latency communications (URLLC). The following technical bases are required as premises for all three application scenarios, namely: the time frequency resource is flexibly utilized, and the peak throughput rate is ensured. In order to improve transmission reliability, in the 3GPP standard conference, a Physical Sidelink Feedback Channel (PSFCH) is defined in an sidelink, and is used for transmitting Sidelink Feedback Control Information (SFCI), and at least can be used for a receiving end to feed back a confirmation message of whether reception is successful or not to a transmitting end. The feedback channel is periodically transmitted on the resource pool, the transmission period is N ═ 0,1,2,4 time slots, and in the sidelink, the symbol overhead of the feedback channel needs to be considered when calculating the effective number of REs of the data transmission block. The symbol overhead of the feedback channel in different periods is different, and the symbol overhead of the feedback channel significantly affects the determined size of the transmission block, thereby affecting the transmission of data on the sidelink. At present, in the sidelink, how to determine the transport block size of data is a problem to be studied.

Disclosure of Invention

The application provides a method and a device for transmitting and receiving data, which are used for effectively determining the size of a transmission block in a sidelink and improving the data transmitting and receiving performance of the sidelink.

In a first aspect, the present application provides a data sending method, which may be executed by a sending end device or a first terminal device, where the sending end device may be an on-board device, a device used by a user, a road side unit, or the like. The first terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to the first information; wherein the first information is used to indicate one way of determining the symbol number R from M ways of determining the symbol number R, where R and M are positive integers; the first terminal equipment determines the size of a transmission block of the first data according to the symbol number R; and the first terminal equipment sends the first data.

According to the method, the first information is determined in a mode of indicating one mode of determining the symbol number R in M modes of determining the symbol number R, so that appropriate first information can be flexibly selected according to a specific service scene and a data transmission environment, and the first terminal equipment can determine the symbol number R occupied by a feedback channel in a time slot where the first data is located according to the first information, thereby determining the size of a transmission block of the first data, further completing rate matching of the first data and transmitting the first data. And selecting several methods from M ways of determining the symbol number R to indicate one way of determining the symbol number R, so as to adapt to different service requirements and channel environments and improve the transmission performance of the first data.

In a possible implementation manner, the first information is obtained by the first terminal device through configured signaling or preconfigured signaling; or, the first information is information configured on a resource pool.

Through the method, the first terminal equipment can acquire the first information through the configured or pre-configured signaling or the resource pool, thereby reducing unnecessary signaling overhead generated by sending the first information and improving the scheduling efficiency.

In one possible implementation, the first information indicates one of:

the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period;

the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel in each time slot;

the symbol overhead of the feedback channel in each slot is indicated by Sidelink Control Information (SCI) sent by the first terminal device.

By the method, the network side equipment can configure various first information for the terminal equipment, so that the first terminal equipment can flexibly select different static configuration modes according to actual needs to determine the first information and improve the transmission performance of the first data.

In a possible implementation manner, the first terminal device sends an SCI; the SCI includes the first information.

By means of sending SCI, the first information can be dynamically indicated according to actual needs, so that flexibility of data transmission is improved.

In one possible implementation, the SCI occupies L bits, where L is a positive integer; the SCI indicates an item from any at least 2 of the following ways:

the symbol overhead of the feedback channel on each time slot is 0 symbol;

the symbol overhead of the feedback channel on each time slot is 1 symbol;

the symbol overhead of the feedback channel on each time slot is 2 symbols;

the symbol overhead of the feedback channel on each time slot is 3 symbols;

the symbol overhead of the feedback channel on each time slot is the average value of each time slot occupied by the feedback channel in one period;

the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot.

By the method, the SCI configuration mode can be flexibly selected under the condition of ensuring multiple configuration modes of the first information required by rate matching according to the requirement of resource configuration, so that the first terminal equipment can flexibly select different dynamic configuration modes according to the actual requirement to determine the first information and improve the transmission performance of the first data.

In one possible implementation, the SCI occupies 3 bits, and the SCI indicates one of:

the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period; the symbol of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot.

At least the above 6 possible methods of determining the feedback channel symbol overhead can be configured by setting a 3-bit SCI, thereby providing a flexible configuration for the determination of the TBS of the first data.

In one possible implementation, the SCI occupies 2 bits, and the first information indicates one of:

the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each slot is 3 symbols.

the symbol overhead of the feedback channel on each time slot is 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period; the symbol of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot.

In one possible implementation manner, the SCI occupies 1bit, and the first information indicates one of:

the symbol overhead of the feedback channel on each time slot is 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period.

In a possible implementation manner, the first information is configured or preconfigured by the network-side device before the first terminal device sends the SCI; the first information includes at least one of:

the symbol overhead of the feedback channel on each time slot is indicated by the possible available symbol number of the PSSCH on each time slot; the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot; the symbol overhead of the feedback channel on each time slot is indicated to occupy Q symbols; q is less than or equal to 3; q is a positive integer.

By combining the static configuration method and the dynamic indication method, more application scenes can be adapted to flexibly configure the first information, so that the transmission performance of the first data is improved.

In a second aspect, the present application provides a data transmission method, where a first terminal device determines, according to first information, a symbol number R occupied by a feedback channel in a time slot where the first data is located, where R is a positive number; the first information is used for indicating the period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation; the first terminal equipment determines the size of a transmission block of the first data according to the symbol number R; and the first terminal equipment sends the first data.

According to the method, the first information is determined according to the corresponding relation between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot and the period of the feedback channel, so that the first information can be implicitly indicated through the period of the feedback channel according to a specific service scene and a data transmission environment, and the number of symbols occupied by the feedback channel in the time slot where the first data is located can be determined according to the first information by the first terminal device, so that the size of a transmission block of the first data is determined, and further, the rate matching of the first data is completed to send the first data. In the method, the transmission performance of the first data is improved by implicitly indicating various modes of determining the number of symbols occupied by the feedback channel on each time slot while effectively reducing the signaling overhead.

In one possible implementation manner, a correspondence relationship between a period of the feedback channel and a number of symbols occupied by the feedback channel on each time slot corresponds to at least one of M manners for determining the number of symbols R; and M is a positive integer.

By the method, the period of the feedback channel can correspond to at least one mode of M modes through an implicit indication mode, and then several methods are selected from the mode of indicating one mode of determining the symbol number R in the M modes of determining the symbol number R, so that the method is suitable for different service requirements and channel environments, and the transmission performance of the first data is improved.

In one possible implementation, the period of the feedback channel includes N time slots; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

when N is 0 or 1, the symbol overhead of the feedback channel on each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period; when N is 0 or 1, the symbol overhead of the feedback channel on each slot is indicated by the maximum value of the number of symbols of each slot occupied by the data channel in one period; when N is 0, the symbol overhead of the feedback channel on each timeslot is 0 symbols; when N is 1, the symbol overhead of the feedback channel on each slot is 3 symbols.

By the method, the number of symbols occupied by the feedback channel on each time slot when N is 0 or N is 1 can be flexibly configured.

In one possible implementation, the period of the feedback channel includes N time slots; n is 2; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is a positive number; the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is an average value of each time slot occupied by the feedback channel in one period.

By the method, the number of symbols occupied by the feedback channel on each time slot when N is 2 can be flexibly configured.

In one possible implementation, the period of the feedback channel includes N time slots; n is 4; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period; the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each slot is the number of symbols available to indicate the possible psch on each slot.

By the method, the number of symbols occupied by the feedback channel on each time slot when N is 4 can be flexibly configured.

In a third aspect, the present application provides a data receiving method, which may be executed by a receiving end device or a second terminal device, where the receiving end device may be an on-board device, a device used by a user, a road side unit, and the like. The second terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to first information, wherein the first information is used for indicating one mode for determining the symbol number R from M modes for determining the symbol number R, and R and M are positive integers; the second terminal equipment determines the size of a transmission block of the first data according to the symbol number R; and the second terminal equipment demodulates the first data according to the transmission block size.

According to the method, the first information is determined in a mode of indicating one mode of determining the symbol number R in M modes of determining the symbol number R, so that appropriate first information can be flexibly selected according to a specific service scene and a data transmission environment, and the second terminal equipment can determine the symbol number R occupied by a feedback channel in a time slot where the first data is located according to the first information, so that the size of a transmission block of the first data is determined, and further, rate matching of the first data is completed to receive the first data. And selecting several methods from M ways of determining the symbol number R to indicate one way of determining the symbol number R, so as to adapt to different service requirements and channel environments and improve the transmission performance of the first data.

In a possible implementation manner, the first information is obtained by the second terminal device through a signaling configured by a network side device or a pre-configured signaling; or, the first information is information configured on a resource pool.

In one possible implementation, the first information indicates one of:

the symbol overhead of the feedback channel on each time slot is the average value of each time slot occupied by the feedback channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the sideline control information sent by the first terminal equipment.

Before the second terminal device determines, according to the first information, the number of symbols R occupied by the feedback channel in the time slot where the first data is located, the possible implementation manner further includes:

the second terminal equipment receives the sideline control information SCI sent by the first terminal equipment; the SCI includes the first information.

By means of receiving the SCI, the first information dynamically indicated by the first terminal device can be acquired according to actual needs, so that flexibility of data transmission is improved.

In one possible implementation, the SCI occupies L bits, where L is a positive integer; the SCI indicates one from any at least 2 of:

the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of each time slot occupied by the feedback channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period.

By the method, the configuration mode of the SCI can be flexibly selected under the condition of ensuring multiple configuration modes of the first information required by rate matching according to the requirement of resource configuration, so that the first terminal equipment can flexibly select different dynamic configuration modes according to the actual requirement and send the different dynamic configuration modes to the second terminal equipment through the SCI, so that the second terminal equipment determines the first information and improves the transmission performance of the first data.

the symbol overhead of the feedback channel on each time slot is the possible available symbol number of the indicated PSSCH on each time slot; the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot; the symbol overhead of the feedback channel on each time slot is indicated to occupy Q symbols; q is less than or equal to 3; q is a positive integer.

In a fourth aspect, the present application provides a data receiving method, where a second terminal device determines, according to first information, a symbol number R occupied by a feedback channel in a time slot where the first data is located, where R is a positive number, and the first information is used to indicate a period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation; the second terminal equipment determines the size of a transmission block of the first data according to the symbol number R; and the second terminal equipment demodulates the first data according to the transmission block size.

By the method, the first information is determined by the corresponding relation between the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot and the period of the feedback channel, so that the signaling overhead is effectively reduced, and meanwhile, the transmission performance of the first data is improved by implicitly indicating various modes of determining the number of symbols occupied by the feedback channel on each time slot.

In one possible implementation, the period of the feedback channel includes N time slots; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the method comprises the following steps:

when N is 0 or N is 1, the symbol overhead of the feedback channel on each time slot is an average value of each time slot occupied by the feedback channel in one period; when N is 0 or 1, the symbol overhead of the feedback channel on each timeslot is indicated by a maximum value of each timeslot occupied by the data channel in one period; when N is 0, the symbol overhead of the feedback channel on each timeslot is 0 symbols; when N is 1, the symbol overhead of the feedback channel on each slot is 3 symbols.

In one possible implementation, the period of the feedback channel includes N time slots; n is 2; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items: the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is a positive integer; the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is an average value of each time slot occupied by the feedback channel in one period.

In one possible implementation, the period of the feedback channel includes N time slots; n is 4; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items: the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period; the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each slot is the number of symbols available to indicate the possible psch on each slot.

In a fifth aspect, a communication device is provided, the device having functionality to implement the behavior of the method instances of the first or third aspect. The apparatus may be located in or be the originating device. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. In one possible implementation, the apparatus includes a processing unit and a transceiver unit in its structure, and these units may perform corresponding steps or functions in the above method examples of the first aspect or the third aspect, including the transceiver unit and the processing unit.

In a sixth aspect, there is provided a communication device having functionality to implement the actions in the method examples of the second or fourth aspect above. The device can be located in the receiving end equipment or be the receiving end equipment. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. In one possible implementation, the apparatus includes a processing unit and a transceiver unit in its structure, and these units may perform the corresponding steps or functions in the above-mentioned method examples of the second aspect or the fourth aspect, including the transceiver unit and the processing unit.

In a seventh aspect, a communications apparatus is provided. The apparatus provided by the present application has the function of implementing the originating device as described in the above method, and includes means (means) for performing the steps or functions described in any of the first aspect, the third aspect, any of the possible implementations of the first aspect, or any of the possible implementations of the third aspect. The steps or functions may be implemented by software, or by hardware (e.g., a circuit), or by a combination of hardware and software. Wherein the apparatus may be an originating device.

In one possible implementation, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to enable the apparatus to perform the respective functions of the originating device in the above-described method. Optionally, the apparatus may also include one or more memories for coupling with the processor that hold the necessary program instructions and/or data for the apparatus. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited.

In another possible implementation, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver or the input/output circuit to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the originating device in any one of the first aspect, the third aspect, any one of the possible implementations of the first aspect, or any one of the possible implementations of the third aspect.

In one possible implementation, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to enable the apparatus to perform the respective functions of the originating device in the above-described method. Optionally, the apparatus may further comprise one or more memories for coupling with the processor, which stores program instructions and/or data necessary for the terminal device. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The apparatus may be located in or be the originating device.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program comprising instructions for performing the first aspect, the third aspect, any of the possible implementations of the first aspect, or the method in any of the possible implementations of the third aspect.

In a ninth aspect, there is provided a computer program product, the computer program product comprising: computer program code for causing a computer to perform the method of any of the above described first aspect, third aspect, any of the possible implementations of the first aspect, or any of the possible implementations of the third aspect, when said computer program code is run on a computer.

In a tenth aspect, a communication device, such as a system-on-chip or the like, is provided, which is connected to a memory and configured to read and execute a software program stored in the memory, and perform the method in any one of the above-mentioned first aspect, third aspect, and any possible implementation manner of the first aspect, or any possible implementation manner of the third aspect.

In an eleventh aspect, a communication device is provided. The apparatus provided by the present application has the function of implementing the originating device or the terminating device described in the above method aspect, and includes means (means) for performing the steps or functions described in any of the second aspect, the fourth aspect, any possible implementation manner of the second aspect, or any possible implementation manner of the fourth aspect. The steps or functions may be implemented by software, or by hardware (e.g., a circuit), or by a combination of hardware and software. The device can be a receiving end device.

In one possible implementation, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to support the apparatus to perform the corresponding functions of the receiving end device in the above method.

Optionally, the apparatus may also include one or more memories for coupling with the processor that hold the necessary program instructions and/or data for the apparatus. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited.

In another possible implementation, the apparatus includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver or the input/output circuit to transceive signals, the memory is configured to store a computer program, and the processor is configured to execute the computer program in the memory, so that the apparatus performs the method performed by the sink device in any one of the second aspect, the fourth aspect, any one of the possible implementations of the second aspect, or any one of the possible implementations of the fourth aspect.

In one possible implementation, the apparatus includes one or more processors and a communication unit. The one or more processors are configured to enable the apparatus to perform the corresponding functions of the originating device or the receiving device in the above method. Optionally, the apparatus may further comprise one or more memories for coupling with the processor, which stores program instructions and/or data necessary for the terminal device. The one or more memories may be integral with the processor or separate from the processor. The present application is not limited. The device can be located in the receiving end equipment or be the receiving end equipment.

In a twelfth aspect, a computer-readable storage medium is provided for storing a computer program comprising instructions for performing any one of the possible implementations of the first to fourth aspects.

In a thirteenth aspect, there is provided a computer program product comprising: computer program code for causing a computer to perform any of the possible implementations of the first to fourth aspects described above, when said computer program code is run on a computer.

In a fourteenth aspect, a communication device, such as a chip system, is provided, where the communication device is connected to a memory, and is configured to read and execute a software program stored in the memory, and execute any one of the possible implementations of the first to fourth aspects.

In the foregoing embodiments, reference may be made to beneficial effects of the embodiments of the first aspect to the fourth aspect, which are not described herein again.

Drawings

FIGS. 1 a-1 c are schematic diagrams of a system architecture according to an embodiment of the present application;

FIGS. 2 a-2 e are schematic diagrams of a data channel structure;

fig. 3a is a schematic flowchart of a method for determining a TBS according to an embodiment of the present application;

fig. 3b is a schematic flowchart of a data receiving and sending method according to an embodiment of the present application;

fig. 3c is a schematic flowchart of a transmission method of control information according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a data receiving and sending method according to an embodiment of the present application;

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

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

Detailed Description

The embodiments of the present application will be described in detail 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: the fourth Generation (4G) 4G system includes an LTE system, a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth Generation (5G) system such as NR, and a future communication system such as a 6G system. In addition, the technical solution provided in the embodiment of the present application may be applied to a cellular link, and may also be applied to a link between devices, for example, a device to device (D2D) link. The D2D link or the V2X link may also be referred to as a Sidelink (SL), where the sidelink may also be referred to as a side link or a sidelink, etc. In the embodiments of the present application, the above terms all refer to links established between devices of the same type, and have the same meaning. The devices of the same type may be links from the terminal device to the terminal device, links from the base station to the base station, links from the relay node to the relay node, and the like, which are not limited in this embodiment of the present application. For the link between the terminal device and the terminal device, there is a D2D link defined by release (Rel) -12/13 of 3GPP, and also a V2X link defined by 3GPP for the internet of vehicles, vehicle-to-vehicle, vehicle-to-cell, or vehicle-to-any entity, including Rel-14/15. But also the Rel-16 and subsequent releases of NR system based V2X link currently under investigation by 3 GPP. V2X specifically includes several application requirements, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) communication interaction. As shown in fig. 1 a. V2V refers to inter-vehicle communication; V2P refers to vehicle-to-person communication (including pedestrians, cyclists, drivers, or passengers); V2I refers to vehicle to network device communication, such as RSU, and another V2N may be included in V2I, V2N refers to vehicle to base station/network communication. Among them, the RSU includes two types: the RSU of the terminal type is in a non-mobile state because the RSU is distributed on the roadside, and the mobility does not need to be considered; the RSU, being of the base station type, can provide timing synchronization and resource scheduling to the vehicle with which it communicates.

This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

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

Some terms of the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

1) Terminal equipment, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices with wireless connection capability or processing devices connected to wireless modems. The device may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The apparatus may include a User Equipment (UE), a wireless terminal apparatus, a mobile terminal apparatus, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an Access Point (AP), a remote terminal apparatus (remote terminal), an access terminal apparatus (access terminal), a user terminal apparatus (user terminal), a user agent (user agent), or a user equipment (user device), etc. For example, mobile phones (or so-called "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-embedded mobile devices, smart wearable devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

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

While the various terminal devices described above, if located on a vehicle (e.g., placed in or installed in a vehicle), may be considered to be vehicle-mounted terminal devices, also referred to as, for example, on-board units (OBUs); a roadside terminal device, also referred to as a Road Side Unit (RSU), may be considered a roadside terminal device if located on the roadside terminal device (e.g., placed within or installed within the roadside Unit). The terminal device of the present application may also be an on-board module, an on-board component, an on-board chip, or an on-board unit built into the vehicle as one or more components or units, and the vehicle may implement the method of the present application through the built-in on-board module, on-board component, on-board chip, or on-board unit.

2) Network side devices, including Access Network (AN) devices, such as base stations (e.g., access points), may refer to devices in the access network that communicate with wireless terminal devices over one or more cells over AN air interface, or, for example, a network side device in V2X technology is a Road Side Unit (RSU). The base station may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The RSU may be a fixed infrastructure entity supporting the V2X application and may exchange messages with other entities supporting the V2X application. The network side device may also coordinate attribute management for the air interface. For example, the network side device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (gNB) in a 5G NR system, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud radio access network) system, which is not limited in the embodiment of the present application. A transmitter, also called a sending device, corresponds to a receiver, which is used to send information, such as data packets, control information, indication information, etc. A receiver, also called a receiving device, corresponds to a transmitter, the receiver is used for receiving information sent by the transmitter, and the receiver can also send feedback information to the transmitter, that is, one device can be used as both the transmitter and the receiver.

3) V2X is a key technology of the future intelligent transportation system. It enables communication between cars, between cars and base stations, and between base stations. Therefore, a series of traffic information such as real-time road conditions, road information, pedestrian information and the like is obtained, so that the driving safety is improved, the congestion is reduced, the traffic efficiency is improved, and the vehicle-mounted entertainment information is provided. The V2X technology is an application of the D2D technology in the internet of vehicles, or V2X is a specific D2D or sidelink technology. In the V2X scenario, the sidelink is a direct link connection between two V2X terminals, and the V2X terminal is a terminal with V2X functionality, such as the same type of device described above. V2X, in version (Rel) -14/15/16, V2X has established itself as a major application of device-to-device (D2D) technology. V2X specifically includes several application requirements, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) direct communication, and vehicle-to-network (V2N) communication interaction. As shown in fig. 1 a. V2V refers to inter-vehicle communication; V2P refers to vehicle-to-person communication (including pedestrians, cyclists, drivers, or passengers); V2I refers to vehicle to network device communication, such as RSU, and another V2N may be included in V2I, V2N refers to vehicle to base station/network communication. Among them, the RSU includes two types: the RSU of the terminal type is in a non-mobile state because the RSU is distributed on the roadside, and the mobility does not need to be considered; the RSU, being of the base station type, can provide timing synchronization and resource scheduling to the vehicle with which it communicates.

4) The transmission link comprises a side uplink between two devices, an uplink and a downlink between the terminal device and the network side device, and the like.

5) The Sidelink (SL) mainly refers to a link established between devices of the same type, and may also be referred to as a side link, a secondary link, an auxiliary link, or the like, and this name is not limited in this embodiment of the present application. The same type of device may be a link from a terminal device to a terminal device, a link from a base station to a base station, a link from a relay node to a relay node, and the like, which is not limited in this embodiment of the present application. SL transmission, the data transmission of two V2X terminals on the sidelink, is called SL transmission.

Two V2X terminals may establish a sidelink connection before SL transmission. For example, the V2X terminal as the initiator sends a request for establishing a sidelink connection to the network side device, and if the network side device agrees to establish a sidelink connection with the V2X terminal, the network side device sends configuration information for establishing a sidelink connection to the V2X terminal, and the V2X terminal establishes a sidelink connection with another V2X terminal according to the configuration information sent by the network side device.

Taking a 5G NR system as an example, in the 5G NR system, Resource Elements (REs) are minimum resource units for data transmission, and correspond to 1 time domain symbol in a time domain and 1 subcarrier in a frequency domain; a Physical Resource Block (PRB) is a basic unit for resource scheduling, and corresponds to a plurality of consecutive time domain symbols in a time domain and a plurality of consecutive subcarriers in a frequency domain, or corresponds to a plurality of consecutive subcarriers in a frequency domain.

The time domain resource includes a time unit, which may be a radio frame, a subframe, a slot (slot), a mini slot (slot), or an Orthogonal Frequency Division Multiplexing (OFDM) symbol (symbol) or SC-FDMA symbol, and may also be a resource composed of multiple radio frames or multiple subframes or multiple slots or multiple micro slots or multiple OFDM symbols, or other time domain granularity (e.g., system frame, subframe). One radio frame may include a plurality of subframes, one subframe may include one or more slots, and one slot may include at least one symbol. It should be noted that, in the embodiment of the present application, one OFDM symbol may also be simply referred to as one symbol. For example 14 symbols, or 12 symbols. A Transmission Time Interval (TTI) is a time domain granularity for carrying data information or service information; for example, one data packet is carried on a time-frequency resource composed of one TTI in the time domain and at least one physical resource block in the frequency domain.

Each symbol length may be different according to the subcarrier spacing, and thus the slot length may be different. In the 5G NR, one slot may be composed of at least one of symbols used for downlink transmission, symbols used for flexible transmission, symbols used for uplink transmission, and the like, so that the composition of slots is referred to as different Slot Formats (SFs), and there may be up to 256 slot formats. The length of one TTI may be S time domain symbols, or may be smaller than S time domain symbols; the time slots may have different slot types, and the different slot types include different numbers of symbols, for example, a TTI with a length of S time domain symbols may be referred to as a slot (slot) or a full slot (slot), and a TTI with a length of less than S time domain symbols may be referred to as a mini-slot (mini-slot) or a non-slot (non-slot). Where S-12 or 14, e.g. for normal cyclic prefix (normal CP), S-14; for extended cyclic prefix (extended CP), S ═ 12. The present application is described with reference to a time slot as an example, but is not limited to the time slot implementation.

Sub-carrier spacing (SCS), which is the spacing value between the center positions or peak positions of two subcarriers adjacent to each other in the frequency domain in the OFDM system. In 5G NR, various subcarrier spacings are introduced, and different carriers may have different subcarrier spacings. The baseline is 15kHz and can be 15kHz x 2n, n being an integer from 3.75, 7.5 up to 480kHz, for example, with respect to subcarrier spacing, see table 1 below:

TABLE 1

μ	Δf＝2^μ·15[kHz]
		0	15
1	30
		2	60
3	120
		4	240

Where μ is used to indicate the subcarrier spacing, for example, when μ is 0, the subcarrier spacing is 15kHz, and when μ is 1, the subcarrier spacing is 30 kHz. The length of one time slot corresponding to different subcarrier spacings is different, the length of one time slot corresponding to a subcarrier spacing of 15kHz is 0.5ms, the length of one time slot corresponding to a subcarrier spacing of 60kHz is 0.125ms, and so on. Accordingly, the length of one symbol corresponding to different subcarrier intervals is different.

6) In the frequency domain, since the 5G NR single carrier bandwidth can reach 400MHz, a bandwidth part (BWP) is defined in one carrier, which may also be referred to as a carrier bandwidth part (carrier bandwidth part). BWP includes several resource units, such as Resource Blocks (RBs), in succession in the frequency domain. The bandwidth portion may be a downlink or uplink bandwidth portion, and the terminal device receives or transmits data on a data channel within the activated bandwidth portion.

7) V2X data transmission method. In V2X, it is mainly the terminal device and the communication between the terminal devices. For the transmission mode between the terminal device and the terminal device, the current standard protocol supports a broadcast mode, a multicast mode, and a unicast mode.

The broadcasting mode is as follows: the broadcast method is that a terminal device serving as a transmitting end transmits data in a broadcast mode, and a plurality of terminal devices can receive Sidelink Control Information (SCI) from the transmitting end or data information carried on a Sidelink Shared Channel (SSCH).

In the sidelink, the manner of ensuring that all terminal devices can resolve the control information from the transmitting end is that the transmitting end does not scramble the control information, or the transmitting end scrambles the control information by using a scrambling code known to all terminal devices.

The multicast mode is as follows: the multicast mode is similar to broadcast transmission, and a group of terminal devices can analyze SCI or SSCH by using a multicast mode for data transmission.

A unicast mode: the unicast mode is a mode in which one terminal device transmits data to another terminal device, and the other terminal device does not need or cannot parse the data.

8) Feedback information: the feedback information required to be received by the first device is sent to the first device by other devices, and the feedback information required to be sent by the first device is sent to other devices by the first device. Wherein, the other devices may be other terminal devices or network devices. The specific feedback information includes HARQ feedback information and the like. Hereinafter, data transmitted from the first device to the second device is referred to as first data, feedback information transmitted from the first device to the second device is referred to as control information, and the control information is feedback information for data, for example, second data, transmitted from the second device to the first device in the forward direction, so the control information corresponds to the second data.

9) The mapping may also be described as "occupying" or "using", for example, a communication system maps a channel on a carrier, that is, a part or all of time-frequency resources corresponding to the carrier are used or occupied by the communication system to transmit information carried by the channel.

10) Rate matching, which means that data is not mapped onto symbols. Typically for the transmitter side. For the transmitter, rate matching means that the transmitter performs channel coding on data to be transmitted according to the available physical resources actually provided, and then transmits the coded data on the available physical resources. If the total resource is S1, the unusable resource is S2, and the available resources are (S1-S2). The rate matching means that channel coding is directly performed on the data to be transmitted according to the resources (S1-S2), and the data is mapped and transmitted to the resources S1-S2.

11) The puncturing includes puncturing at a transmitter side and puncturing at a receiver side. For the transmitter, puncturing refers to that the transmitter performs channel coding on data to be transmitted at the transmitting side according to the total nominal transmission resources, then transmits the coded data on the available resources, and does not transmit data in the data portion corresponding to the unavailable resources. If the total resource is S1, the unusable resource is S2, and the available resources are (S1-S2). Transmitter puncturing is channel coding of data to be transmitted according to the resources of S1 and mapping the data to the total resources of S1, but transmitting only on the resources of (S1-S2).

For the receiver side, only receive puncturing will be done. If rate matching is done at the transmitter side, the receiver only receives the transmitted symbols. If the transmitter performs puncturing, the receiver only receives the transmitted symbols, but sets 0 in the decoder for the corresponding data or signal in the decoder for the untransmitted portion during decoding.

The code rate after channel coding is usually higher than puncturing when the transmitter side rate is matched, but the rate matching has no loss of information bits, and the puncturing is a mode of firstly coding and then puncturing, and has corresponding loss of information bits.

Whether puncturing or rate matching is employed at the transmitter side may be indicated by the receiver using signaling of the data sent to the first device, or may be determined according to predefined rules.

12) AGC operations or AGC symbols. AGC (automatic Gain Control) refers to a Control process for controlling a received signal within an appropriate range before data enters an analog-to-digital converter at a receiver. A certain time period of input signals is required to implement AGC. Therefore, the AGC training can be usually performed by using a certain duration of symbols or sampling points. The symbols used for AGC training are referred to as AGC symbols, and the symbols used for AGC training may be symbols for transmitting data or symbols for transmitting reference signals. The invention is not limited in this regard. It should be noted that if a certain symbol is used for AGC operation once, these symbols or sampling points after AGC will be distorted. Therefore, usually at the AGC symbol, the receiver cannot be used to receive and demodulate directly.

13) The null symbol is also called GAP symbol. In the transmission process, especially in a TDD system or carrier, the UE cannot receive at the time of transmission and cannot transmit at the time of reception. And further, due to the influence of the TDD duplexer, when the UE is switched from a transmitting state to a receiving state or from a receiving state to a transmitting state, a certain switching time of the duplexer is required. In system design, a certain duration is usually reserved, for example, the number of symbols in a sub-payload interval is reserved, such as a null symbol for performing transceiving or transceiving conversion by using one symbol. On this null symbol, the communication device typically does neither transmit nor receive anything.

The terms "system" and "network" in the embodiments of the present application may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present application. "at least one" is to be understood as meaning one or more, for example one, two or more. For example, the inclusion of at least one means that one, two or more are included, and does not limit which is included. For example, at least one of A, B and C is included, then inclusion can be A, B, C, A and B, A and C, B and C, or A and B and C. Similarly, the understanding of the description of "at least one" and the like is similar. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

Unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects. For example, the first time slot and the second time slot, are only used for distinguishing different time slots, and are not used for limiting the priority, importance degree, etc. of the two time slots.

In the wireless communication system shown in fig. 1b, the network device 102 may configure resources and configuration parameters for transmitting sideline data, such as time-frequency resources, modulation and coding schemes, and pilot information, for the

terminals

103 and 104 through the control information, or may be configured by the network device through a high-layer signaling, or may be notified to the terminal device by the network device through a semi-static SL grant (grant) indication.

In the embodiment of the application, the configuration information is used to indicate a time-frequency resource where a sidelink of the terminal device is located. The time-frequency resource in which the sidelink is located may be understood as a time-frequency resource used by the first terminal device and the at least one second terminal device for V2X communication. The configuration information may be Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, or other signaling, which is not limited herein.

As an example, the configuration information may include a time frequency resource in which PSCCH is located, and a time frequency resource in which PSFCH is located. For example, referring to fig. 2a, the time domain resources in which the pschs indicated in the configuration information are located may be from slot 0 to slot 9, and the frequency domain resources in which the pschs are located may be from sub-channel 0 to sub-channel 9. The frequency domain resource of the PSCCH is different from the frequency domain resource of the PSCCH (which may also be the same, in fig. 2a, the frequency domain resource of the PSCCH is different from the frequency domain resource of the PSCCH for example), the time domain resource of the PSCCH is a first and a second symbol after a first Automatic Gain Control (AGC) symbol of each slot from slot 0 to slot 9, and the PSFCH is located one symbol (i.e., symbol 12) before a last gap symbol of each slot from slot 0, slot 3, and slot 6. For example, if the first AGC symbol of each slot is symbol 0, then the time domain resources occupied by the PSCCH, i.e., symbol 1 and symbol 2, and the last gap symbol of each slot is the last symbol, then the time domain resources occupied by each PSFCH is symbol 12.

It should be noted that, in fig. 2a, each time slot includes 14 symbols for illustration, and of course, in different communication systems, a time slot may include 7 symbols or other numbers of symbols, which is not limited herein.

As an example, the configuration information may indicate a resource pool, which is a resource set composed of time domain resources (including a plurality of time domain units) and frequency domain resources (including a plurality of sub-channels). Each time-frequency resource in the resource pool may be used for V2X communication. The terminal device may select one or more time-frequency resources from the pool of resources for V2X communication.

In addition, it should be noted that the time-frequency resource where the sidelink is located may also be obtained in other manners. As an example, it may be preconfigured, for example, including Operation Administration and Maintenance (OAM) configuration, or preset in each terminal device.

In a sidelink communication system, terminal 103 may schedule data for terminal 104 via control information. The

terminals

103 and 104 can communicate with each other via Sidelink (SL). Among them, the terminal 103 may serve as a transmitting device, and the terminal 104 may serve as a receiving device. Alternatively, terminal 104 may serve as a transmitting device and terminal 103 may serve as a receiving device. The control information may be, for example, the SCI, which may be used to schedule data transmitted by terminal 103 to terminal 104 and/or used to schedule data transmitted by terminal 104 to terminal 103. Data transmitted between

terminals

103 and 104 may be carried on a physical sidelink shared channel (psch). The

terminals

103 and 104 may be user equipment, terminals, RSUs, access terminals, terminal units, terminal stations, mobile stations, remote terminals, mobile terminals, wireless communication devices, terminal agents, or terminal devices, etc. Illustratively, the terminal 103 may also have access to the access network equipment, so that the SL link between the terminal 103 and the terminal 104 for SL communication between the terminal 103 and the terminal 104 may be configured by the access network equipment. The access network device may be a RAN base station, and the like, and refer to the above description of the network device 102. It should be understood that the terminal 104 may access an access network device as shown in fig. 1b, or other access network devices not shown in fig. 1 b. It should be understood that in fig. 1b, the eNB and/or the gNB are optional. If there is eNB and/or gNB, it is a V2X scenario with network coverage, and if there is no eNB and/or gNB, it is a V2X scenario without network coverage.

Please refer to fig. 1c, which is a schematic diagram of another wireless communication system network architecture according to the present application, and is a schematic diagram of a network architecture of V2X. Fig. 1c includes four terminal devices, which are UE1, UE2, UE3, and UE4, respectively, where UE1 and UE2 are located in the same lane, and UE3 and UE4 are located in the same lane. Any one of the four terminal devices may communicate with the remaining three terminal devices via a V2X link, which may also be referred to as a sidelink (sidelink). It should be understood that fig. 1c exemplifies that these four UEs are all under the coverage of one network device shown in the figure. Of course, the number of UEs in fig. 1c is only an example, and in practical applications, the network device may provide services for a plurality of UEs. The terminal devices in fig. 1c are vehicle-mounted terminal devices as examples, but are not limited to these in practical applications, and of course, the number of terminal devices in fig. 1c is only an example. Fig. 1c includes a network device and four terminal devices, which are UE1 to UE4, where the four terminal devices may all be under the coverage of a network apparatus, or only a part of the four terminal devices may be under the coverage of the network apparatus, for example, UE1 is under the coverage of the network device, UE2 to UE4 are not under the coverage of the network device, the four UEs may also communicate with each other through a sidelink, or the four terminal devices may also be under the coverage of different network devices, or none of the four terminal devices may be under the coverage of the network device. For example, the UE1 receives the first data through the network device, and thus, may transmit some or all of the first data to the UE2-UE4 through the established sidelink, so that the UE2-UE4 may still receive the first data transmitted by the network device without coverage of the network device. In another possible scenario, the UE2-UE4 are under coverage of the network device, and at this time, for example, by the UE1 sending part or all of the first data to the UE2, the decoding success rate of the first data by the UE2 may be improved, thereby improving data transmission performance.

Therefore, in the V2X or D2D sidelink communication scenario, one UE may perform unicast communication with other UEs in one or more time domain units (e.g., one slot), or one UE may perform multicast communication with different UEs in one or more time domain units. In this case, one UE may receive multiple data from one or more UEs in the same time domain unit. In order to improve transmission reliability, the 3GPP agrees that the sidelink defines the PSFCH, which is used for transmitting the SFCI, and at least used for the receiving end to feed back ACK or NACK and the like to the transmitting end. Thus, the UE may feed back multiple data transmissions, transmit channel state information of the received data to the transmitting UE via the PSFCH, and the transmitting UE may adjust communication link parameters according to the channel state information, for example, transmit multiple HARQ information for the multiple data. If the multiple data channel time domain resources correspond to one PSFCH time domain resource, at this time, there may also be one UE that transmits data on the multiple data channel time domain resources, and the corresponding receiving UE needs to perform feedback on the multiple data channel transmissions.

The 3GPP agrees to configure periodic PSFCH resources for transmission of SFCI. The value of the period of the PSFCH may be 1,2, or 4. Optionally, the period of the PSFCH is a transmission interval of 2 PSFCH resources.

In the 5G NR system, the TBS corresponding to a data packet is calculated according to a time-frequency resource (e.g., the total number of REs on a scheduled psch), overhead on the psch, and a Modulation and Coding Scheme (MCS). Here, the overhead on the psch may include the number of REs occupied by a demodulation reference signal (DMRS) and the number of REs occupied by other overhead.

As shown in fig. 3a, a flow chart of a possible method for calculating the TBS corresponding to a data packet transmitted on the psch is illustrated below by taking psch #1 as an example, and the method may include steps a to c.

Step a, determining the number of effective REs contained in one PRB of PSSCH # 1.

Specifically, the number of valid REs contained in one PRB is determined by the following formula:

wherein, N'_RERepresents the number of valid REs contained in one PRB;

the number of subcarriers of one PRB in the frequency domain is represented, which may be specifically 12;

indicating the number of symbols scheduled for PSSCH # 1;

indicates the number of REs occupied by DMRS in one PRB (which may also be referred to as DMRS overhead);

the number of REs occupied by other overhead is shown, and specifically, the number of REs occupied by overhead of each PRB configured for the xohead parameter in the high-layer parameter PSSCH-ServingCellConfig may be shown. In the embodiment of the present application, if the overhead of the PSFCH is considered, the number of symbols occupied by the PSFCH may be additionally subtracted from the number of symbols scheduled in the PSSCH # 1.

And b, calculating the number of effective REs included in the PSSCH # 1.

Specifically, the number of valid REs included in psch #1 is calculated by the following formula:

N_RE＝min(156,N'_RE)·n_PRB

wherein N is_REIndicating that PSSCH #1 includesEffective number of REs, n_PRBIndicating the number of PRBs that psch #1 includes.

And step c, determining TBS corresponding to the data packet carried by the PSSCH # 1.

Specifically, the information median N is determined by the following formula_info：

N_info＝N_RE·R·Q_m·υ

Wherein Q is_mIs a modulation order, R is a code rate, upsilon is a layer number, wherein Q_mAnd R may be obtained by a table look-up of the index numbers of the MCS configured or indicated by the network device.

Specifically, step c 1: if N is present_info3824 or less, the formula can be passed

Calculating a quantized intermediate value of the system information bit, wherein

And obtaining N or more by looking up the table_i'_nfoThe latest value is used as the TBS for the packet.

Step c 2: if N is present_info3824, then can pass the formula

If the code rate R is less than or equal to 1/4,

wherein

Otherwise

In consideration of the transmission process of the sidelink, when the first terminal device sends the first data to the second terminal device, the PSSCH may occupy the time-frequency resource of the PSSCH, and the PSFCH may also occupy the resource, so that the number of scheduled symbols on the PSSCH occupied by the first data is different in different periods of the PSFCH, and thus the number of available REs of the PSSCH is different.

The first data bearer is exemplified on K time slots in the following. Fig. 2 b-2 e show specific cases where the number of symbols available for the data channel in each slot is different, in case the period of the feedback channel is different.

For example, as shown in fig. 2b, when N is equal to 0, the number of symbols of the psch that can be carried in each slot is 12 symbols, that is, K slots may be set to be continuous or discontinuous in the time domain, or continuous or discontinuous in the slot number, and at this time, the number of symbols available in each slot is 12 symbols.

As shown in fig. 2c, when N is 1, a PSFCH is set every 1 timeslot, and 1 GAP symbol and 2 feedback symbols are required in each period, i.e. the feedback channel needs to occupy 3 symbols. That is, the number of symbols of the psch that can be carried in each slot is 9 symbols. In order to increase the data transmission rate, the symbol overhead of the feedback channel may also be not considered, that is, the feedback channel is used to transmit data over 12 symbols in each slot, in this case, the symbol overhead of the feedback channel in each slot is 0, and the number of available symbols of the pscch may be 12 symbols. However, since the receiving device cannot receive the data transmitted on the PSFCH, the reliability of data transmission may be reduced in this scenario.

As shown in fig. 2d, when N is 2, a PSFCH is set every 2 slots, and 1 GAP symbol and 2 feedback symbols are required in each period, i.e. the feedback channel needs to occupy 3 symbols. And the number of symbols of the PSSCH which can be carried in the time slot corresponding to the beginning of the period is 12 symbols, and the number of symbols of the PSSCH which can be carried in the time slot corresponding to the end of the period is 9 symbols.

The number of symbols of the PSSCH which can be allocated is different according to different service requirements and the channel environment of data transmission. Further considering the influence of the PSFCH on the number of effective REs, in a scenario where the PSFCH needs to be transmitted, the transmitting end device sends the PSSCH occupied by the first data to the receiving end device, which may be set in a time slot corresponding to the end of the outgoing period, that is, K time slots are all set in a time slot without the PSFCH, and at this time, the number of symbols of the PSSCH that can be carried is 12 × K. Of course, it is also possible to transmit the first data on K consecutive slots, and in this case, the number of symbols of the psch allocated to the first data is related to the position of the initial transmission in the period of the feedback channel and K. At this time, if K slots occupied by the psch are set in the slot corresponding to the beginning of the period of each PSFCH, the number of symbols of the psch available is 12 × K symbols. In order to reduce the transmission delay of the psch as much as possible, the K slot start points occupied by the psch may be flexible, for example, the start symbol of the K slots occupied by the psch may be any one symbol in the slot, so that the terminal device may transmit the sidelink traffic information on the psch in time once the sidelink traffic arrives. If the starting symbol of K slots is on the slot corresponding to the end of each period, the number of symbols of the available pschs is 9 × K symbols. If the K slots occupied by the pscch are distributed over different slots in the cycle corresponding to each PSFCH, for example, when the K slots are 4 consecutive slots, there are 2 PSFCHs in the 4 slots, so the number of symbols occupied by the PSFCH is 6, and at this time, the number of available symbols of the pscch is 12 × 4-6 — 42. I.e. the number of available symbols for the psch on each slot is equivalent to 10. For another example, the K slots include 1 slot without a PSFCH and 3 slots with a PSFCH, in which case, the number of symbols occupied by the PSFCH is 9, and the number of available symbols of the PSSCH is 12 × 4-9 — 39. I.e. the number of symbols available for the psch on each slot is equivalent to 9. Thus, different numbers of available symbols may occur when the time slots occupied by the first data are different.

As shown in fig. 2e, when N is 4, a PSFCH is set every 4 slots, and 1 GAP symbol and 2 feedback symbols are required in each period, i.e. the feedback channel needs to occupy 3 symbols. And the number of symbols of the PSSCH which can be carried in the slot corresponding to the period ending is 12 symbols, and the number of symbols of the PSSCH which can be carried in the slot corresponding to the period ending is 9 symbols. The number of symbols of the PSSCH which can be allocated is different according to different service requirements and the channel environment of data transmission. The number of symbols of the psch valid on each slot may be 12, 11, 10, 9 in different data transmission scenarios. The number of symbols of the PSSCH which can be allocated is different according to different service requirements and the channel environment of data transmission. Further considering the influence of the PSFCH on the number of effective REs, in a scenario where the PSFCH needs to be transmitted, the transmitting end device sends the PSSCH occupied by the first data to the receiving end device, which may be set in a time slot corresponding to the end of the outgoing period, that is, K time slots are all set in a time slot without the PSFCH, and at this time, the number of symbols of the PSSCH that can be carried is 12 × K. Of course, it is also possible to transmit the first data on K consecutive slots, and in this case, the number of symbols of the psch allocated to the first data is related to the position of the initial transmission in the period of the feedback channel and K. For example, if K can be divided by 4, in this case, the slot occupied by the first data includes K/4 PSFCHs, so it can be directly determined that, in this scenario, the number of symbols occupied by the first data is 12 × K-0.75K, that is, 11.25 × K, and it can be considered that the number of symbols of the pscch valid in each slot may be 11,12, or 11.25. If K is not evenly divisible by 4 and the initial position of the initial transmission is located in the slot where the PSFCH is located, then the slot occupied by the first data includes K/4 PSFCHs, the number of symbols occupied by the first data is 11.25 × K +1 or 11.25 × K +2, and the number of symbols of the PSSCH valid in each slot may also be considered to be a rounded value, e.g., 11 or 10, or a positive number. In another scenario, that is, K slots selected for transmission are all slots including PSFCH, in this case, the number of symbols of the pscch valid on each slot may be considered to be 9.

Furthermore, in order to improve the data transmission performance, a multiple repetition mechanism of the PSSCH can be introduced to perform repeated transmission on the same data packet. Taking the example that the first data needs to be transmitted P times repeatedly, and each transmission occupies 1 psch resource, at this time, the Transport Block Size (TBS) corresponding to K pschs needs to be kept the same. At this time, the determination of the number of available REs for the first data is also affected. According to the different periods of the PSFCH, that is, when N is 0,1,2, and 4, the number of symbols of the PSSCH that can be carried in each slot is different, and the corresponding number of valid REs is also different.

The following description will take P times of repeated transmission of the first data, and each time of repeated transmission occupies K time slots as an example. In the case of different periods of the feedback channel, the number of symbols available for the data channel in each slot is different.

For example, when N is 0, the number of symbols of the psch that can be carried on each slot is 12 symbols, and each of the P repeated transmissions is carried on K slots. At this time, the K time slots are continuous or discontinuous in the time domain, or continuous or discontinuous in the time slot number, so that the number of available symbols in each time slot is guaranteed to be 12 symbols.

When N is 1, one PSFCH is set for each slot, and if the overhead of the PSFCH on each slot is not considered, P times of repeated transmission are carried on the slot corresponding to the beginning of each period, and the number of available PSSCH symbols is 12 × P × K symbols. If the overhead of the PSFCH on each slot is considered, P repeated transmissions are carried on the slot corresponding to the beginning of each period, and the number of available symbols of the PSSCH is 9 × P × K symbols. Therefore, the number of symbols of the psch that can be allocated differs according to different traffic demands and channel environments in which data is transmitted.

When N is 2, each 2 slots is set with one PSFCH, and the number of symbols that can carry the PSSCH is 12 symbols in the slot corresponding to the beginning of the cycle, and the number of symbols that can carry the PSSCH is 9 symbols in the slot corresponding to the end of the cycle. At this time, if P times of repeated transmissions are carried in the slot corresponding to the beginning of each period, the number of symbols of the available pschs is 12 × P × K symbols. In order to reduce the transmission delay of the pschs as much as possible, the time domain resource starting point of the first psch (or referred to as the earliest psch) of the P pschs may be flexible, for example, the starting symbol of the earliest psch may be any symbol in a slot, so that the terminal device may transmit the sidelink traffic information on the pschs in time once the sidelink traffic arrives. If P repeated transmissions are carried on the slot corresponding to the end of each period, the number of symbols of the available pschs is 9 × K × P symbols. In the 2 cases, since data can be filled in each symbol, the transport block size corresponding to P pschs can remain the same in the case of full. If P times of repeated transmissions are carried on different time slots in each period, in order to ensure that the sizes of the transmission blocks corresponding to the P pschs are the same, data cannot occupy 12 symbols in a time slot without a PSFCH, and therefore, the actually transmitted data amount is smaller than the size of an available transmission block. In another possible scenario, to increase the amount of data transmission, the originating device still transmits 12 symbols worth of data on the time slot with PSFCH, where the amount of data actually transmitted is greater than the available transport block size. At this time, it is difficult to accurately calculate the number of valid REs of the psch.

Similarly, when N is 4, a PSFCH is set every 4 slots, and 1 GAP symbol and 2 feedback symbols are required in each period, that is, the feedback channel needs to occupy 3 symbols. And the number of symbols of the PSSCH which can be carried in the slot corresponding to the period ending is 12 symbols, and the number of symbols of the PSSCH which can be carried in the slot corresponding to the period ending is 9 symbols. The number of symbols of the PSSCH which can be allocated is different according to different service requirements and the channel environment of data transmission. The number of symbols of the psch valid on each slot may be 12, 11, 10, 9, or a number within an interval of [9,12] in different data transmission scenarios. The number of symbols of the PSSCH which can be allocated is different according to different service requirements and the channel environment of data transmission. Further considering the influence of the PSFCH on the number of effective REs, in a scenario where the PSFCH needs to be transmitted, the originating device sends the PSSCH occupied by the first data to the receiving device, which may be set in a time slot corresponding to the end of the outgoing period, that is, each of the P times of repeated transmissions is set in a time slot without the PSFCH, and at this time, the number of symbols of the PSSCH that can be carried is 12 × P × K. Of course, it is also possible to transmit P repeated transmissions over K × P consecutive slots, in which case the number of symbols of the psch allocated for the first data is related to the position of the initial transmission at the period of the feedback channel and K. For example, if K can be divided by 3, in this case, the slot occupied by the first transmission includes K/3 PSFCHs, so it can be directly determined that, in this scenario, the number of symbols occupied by the first data is 12 × K-K, i.e. 11 × K, and the number of symbols of the pscch valid in each slot can be considered to be 11. If K cannot be divided by 3 and the initial position of the initial transmission is located in the timeslot where the PSFCH is located, then the timeslot occupied by the first data includes K/3 PSFCHs, the number of symbols occupied by the first data is 12 × K-K +1 or 12 × K-K +2, and the number of symbols of the PSSCH valid in each timeslot can also be considered to be 11 or 10. In another scenario, that is, K slots selected for transmission are all slots including PSFCH, in this case, the number of symbols of the pscch valid on each slot may be considered to be 9.

Therefore, the psch of the first data transmission may actually occupy a different number of symbols per slot at the time of actual transmission. The accuracy requirements for the estimation of the TBS are different under different configuration requirements, such as peak throughput requirements. Different TBS sizes will affect the rate matching method, coding method, and Rx decoding method for Tx. Therefore, in order to calculate the TBS more accurately, the embodiment of the present application introduces the target number of effective REs, so that the terminal device can determine the transport block size TBS corresponding to the first data packet according to the target number of effective REs. Specifically, according to the transmission scenario of the first data, the symbol overhead of the PSFCH equivalent to each time slot of the time domain resource of the PSSCH for transmitting the first data may be determined, and further, the effective number of REs equivalent to each time slot, that is, the target effective number of REs, may be determined. At this time, since the parameters (including the target effective RE number and MCS) for calculating the TBS of each psch are the same, the terminal device may calculate the TBS corresponding to the data packet according to the time-frequency resource, overhead, and MCS configured by the network device for a single PUSCH. For a specific procedure, see the above description of calculating TBS, the target number of effective REs in the embodiment of the present application may be substituted for N in the foregoing description_RE。

Based on the wireless communication system shown in fig. 1a, fig. 1b, or fig. 1c, embodiments of the present application provide a data transmission method and a data reception method, which are used to determine a symbol overhead of a feedback channel in a sidelink, so that a size of a data transmission block between a transmitting device and a receiving device is determined according to the symbol overhead of the feedback channel of the sidelink, and further a suitable rate matching is determined, so as to implement data transmission.

An embodiment of the present application provides a data sending and receiving method, please refer to fig. 3b, which is a flowchart of a data sending method provided in an embodiment of the present application. In the following description, the method is applied to the network architectures shown in fig. 1a to 1c as an example. In addition, the method may be performed by two devices, for example, an originating device and a terminating device, where the originating device may be a terminal device or a network side device, or a communication apparatus capable of supporting the terminal device or the network side device to implement the functions required by the method, or the originating device may be a communication chip (e.g., a communication baseband chip system) capable of supporting the terminal device or the network side device to implement the functions required by the method. The same applies to the receiving end device, the receiving end device may be a terminal device or a network side device or a communication apparatus capable of supporting the terminal device or the network side device to implement the functions required by the method, or the receiving end device may be a communication chip (for example, a baseband communication chip system) capable of supporting the terminal device or the network side device to implement the functions required by the method.

For convenience of illustration, taking sidelink as an example below, the originating device may be the UE in fig. 1 a-1 c, and the terminating device may also be the UE in fig. 1 a-1 c, for example, the method is applied to the network architecture shown in fig. 1 a-1 c, the originating device may be any one of UE1-UE3, and the terminating device may be any one of UE1-UE3 except for the originating device, and may also be RSU 1; still alternatively, the originating device may be the RSU1, and the terminating device may be any one of the UEs 1-3. The embodiment of the application does not limit the implementation modes of the sending end device and the receiving end device. It should be noted that the embodiments of the present application are only implemented as examples by the originating device and the terminating device, and are not limited to this scenario. In a downlink transmission link in a cellular link, a transmitting end device may be a network side device, for example, the network side device is a base station, and a receiving end device may also be a terminal device; in an uplink transmission link in a cellular link, an originating device may be a terminal device, and a receiving device may be a network side device, for example, a base station.

The originating device may also be referred to as a transmitter of data. For convenience of description, the following description will take the first terminal device as the originating device and the second terminal device as the receiving device as an example. The method specifically comprises the following steps:

step 301: the first terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to the first information; wherein the first information is used to indicate one way of determining the symbol number R from M ways of determining the symbol number R, where R and M are positive integers;

the first information may be obtained by the first terminal device through configured signaling or preconfigured signaling; or, the first information is information configured on a resource pool. For example, as shown in fig. 3c, the configured signaling may be downlink control information sent by the network device to the first terminal device in step 3011, so that the second terminal device determines the first information according to the downlink control information in step 3012. It may also be preconfigured for higher layer RRC signaling or SIB signaling, or may be preconfigured for the network device on the resource pool of the first terminal device. Therefore, through the first information, the first terminal device may determine the number of target effective REs in each time slot where the first data is located, that is, determine the number of symbols occupied by the feedback channel in each time slot, and further determine the number of symbols occupied by the feedback channel in the time slot occupied by the first data.

Step 302: and the first terminal equipment determines the size of the transmission block of the first data according to the symbol number R.

Specifically, the implementation manner of determining the size of the transmission block of the first data according to the symbol number R may refer to the manner in which, after determining the number of symbols occupied by the feedback channel in each time slot, the number of target effective REs in each time slot is determined, and then the size of the transmission block of the first data is determined, which is not described herein again.

Step 303: and the first terminal equipment sends the first data.

In a possible implementation manner, the first terminal device may send the first data to the second terminal device in a unicast manner, or may send the second data to the second terminal device in a multicast or broadcast manner.

Accordingly, the second terminal device may receive the first data transmitted by the first terminal device.

Step 304: and the second terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to first information, wherein the first information is used for indicating one mode for determining the symbol number R from M modes for determining the symbol number R, and R and M are positive integers.

In a possible implementation manner, the first information may be obtained by the second terminal device through configured signaling or preconfigured signaling; or, the first information is information configured on a resource pool. For example, as shown in fig. 3c, the configured signaling may be downlink control information sent by the network device for the second terminal device in step 3041a, so that, through step 3042a, the second terminal device determines the first information according to the downlink control information. It may also be preconfigured for higher layer RRC signaling or SIB signaling, or may be preconfigured for the network device on the resource pool of the second terminal device. Therefore, through the first information, the second terminal device may determine the target effective RE number on each time slot in the time slot where the first data is located, that is, determine the number of symbols that the feedback channel effectively occupies on each time slot, and further determine the number of symbols R that the feedback channel occupies in the time slot that the first data occupies.

In another possible implementation manner, for example, as shown in fig. 3c, the first information may also be carried in the sidelink control information sent by the first terminal device to the second terminal device. That is, the first terminal device sends the SCI to the second terminal device in step 3041b, and then the second terminal device determines the first information according to the SCI in step 3042 b. Therefore, the second terminal device is consistent with the first information obtained by the first terminal device, so that the first data sent by the first terminal device is successfully analyzed. In addition, in the embodiment of the present application, when the SCI indication is not received or not received, the first terminal device and the second terminal device may further determine the symbol overhead of the feedback channel on each slot by using a certain method configured on the resource pool, so that the second terminal device is consistent with the first information obtained by the first terminal device.

Step 305: and the second terminal equipment determines the size of the transmission block of the first data according to the symbol number R.

The second terminal device determines the size of the transmission block of the first data according to the symbol number R, and may refer to the method for determining the number of the target effective REs in each time slot after determining the number of the symbols occupied by the feedback channel in each time slot in the above embodiments, and further determine the size of the transmission block of the first data, which is not described herein again.

Step 306: and the second terminal equipment demodulates the first data according to the transmission block size.

The second terminal device may determine a rate matching method and a demodulation method corresponding to the transport block according to the size of the transport block, so as to receive the first data.

In the embodiment of the present application, there may be a plurality of ways for determining the symbol number R by M. In one embodiment, at least 5 of the following possible methods or combinations thereof may be included. The following 5 possible methods are described in detail. Examples of the results of subtracting the PSFCH overhead for different methods may be as shown in table 2.

The method comprises the following steps: the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period.

In one example, the target number of valid REs is an average number of valid REs included on a time domain resource occupied by the first data. Correspondingly, the number of available symbols of the PSSCH is the average number of available symbols of the PSSCH in each time slot included in the time domain resource occupied by the first data. Assuming that the total number of symbols available for the psch included in the K slots is R, the number of symbols available for the psch may be derived from R/K, for example, rounding up or rounding down R/K to obtain a target number of symbols available for the psch.

For example, among the K slots, the K-th slot (K is greater than or equal to 1 and K is less than or equal to K) includes PSFCH with the number of available symbols N_kThe average of the number of symbols of the PSFCH over each of the K slots is then determined by

Obtained, for example, as

Or

Wherein

Meaning that the rounding is done down,

the representation is rounded up, it should be noted that the average value of the symbol numbers of the PFSCH may be a decimal number, and correspondingly, the symbol number corresponding to the symbol overhead of the feedback channel in each slot may be a decimal number.

Alternatively, the number of psch available symbols may be calculated based on an average of all slots on the resource pool, in which case the number of psch available symbols may be constant for each slot. For example, if the starting symbol of the K slots is symbol #1 of slot #1, the time domain resource length excluding the PSFCH slot is 12 symbols, and the time domain resource length including the PSFCH slot is 9 symbols, the number of slots excluding the PSFCH is assumed to be N₁The number of time slots including the PSFCH is N₂If the average value of the number of symbols of the PSFCH is (12 × N)₁+9×N₁) K, wherein N₁And N₂Is a positive integer.

For example, a scenario in which the period of the feedback channel is divisible by the number of slots on the resource pool is shown in table 2. When N is 0, the symbol overhead of the PSFCH corresponding to the subtraction is 0 symbols out of the available symbol numbers of the PSSCH on each slot. When N is 1, the symbol overhead of the PSFCH corresponding to the subtraction is 3 symbols out of the available symbol numbers of the PSSCH on each slot. When N is 2, the symbol overhead of the PSFCH corresponding to the subtraction is 2 symbols out of the available symbol numbers of the PSSCH on each slot. When N is 4, the symbol overhead of the PSFCH corresponding to the subtraction is 1 symbol out of the available symbol numbers of the PSSCH on each slot.

By adopting the mode, the TBS is obtained by calculating the average value of the available symbol numbers of the PSSCH, and can be used as a compromise, so that the problem that the TBS calculated according to the time slot comprising the available symbol number of the large PSSCH is too large or the TBS calculated according to the time slot comprising the available symbol number of the small PSSCH is too small is effectively avoided. Whether the PSFCH occupies resources or not, the TB of each timeslot in the resource pool is kept stable, which ensures that the TBs is kept unchanged during initial transmission and retransmission, and at the same time, situations may occur in which the resource utilization is insufficient when the actual available resource is higher than the average value, and data overflows when the actual available resource is lower than the average value.

The method 2 comprises the following steps: the symbol overhead of the feedback channel on each slot is indicated by the maximum number of symbols per slot occupied by the data channel.

Considering that, in a plurality of time slots, some time slots include more available symbols of the PSSCH and some time slots include fewer available symbols of the PSSCH, if the TBS is calculated according to the time slots with more available symbols of the PSSCH, a larger TBS is obtained, and the larger TBS is loaded on the time slots with more available symbols of the PSSCH, which may cause the code rate to be higher than the code rate corresponding to the MCS notified by the control information.

In a possible implementation manner, the target number of valid REs is a maximum number of valid REs included in a time domain resource occupied by the first data. For example, the target number of valid REs may be determined based on a maximum value of symbols occupied by the psch over the slot.

According to the scenario that the number of timeslots on the resource pool can be divided by the period of the feedback channel, one possible implementation of the result of subtracting the PSFCH overhead corresponding to different methods can be shown in table 2. When N is 0, the symbol overhead of the PSFCH corresponding to each slot is 0 symbols out of the available symbols of the PSSCH on each slot. When N is 1, the symbol overhead for the PSFCH is 3 symbols out of the available symbol numbers for the PSSCH on each slot. When N is 2, the symbol overhead corresponding to the PSFCH is 0 symbols out of the available symbol numbers of the PSSCH on each slot. When N is 4, the symbol overhead corresponding to the PSFCH is 0 symbols out of the available symbol numbers of the PSSCH on each slot.

In this method, the number of psch available symbols at each slot may be a fixed value. Because the receiving end UE cannot determine whether each time slot has the PSFCH, the overhead is not considered in the time slot without the PSFCH, the data transmission efficiency can be improved, and the maximum peak throughput rate can be ensured. Meanwhile, data overflow may also be caused, resulting in a decrease in the decoding success rate of data transmission.

The method 3 comprises the following steps: the symbol overhead of the feedback channel on each slot is indicated by the number of symbols that may be occupied on each slot by the psch.

Considering that, in a plurality of slots, some slots include more available symbols of the psch and some slots include fewer available symbols of the psch, if the TBS is calculated according to the slots with fewer available symbols of the psch, a smaller TBS is calculated, and the smaller TBS is loaded on the slots with more available symbols of the psch, which may cause a code rate lower than a code rate corresponding to the MCS notified by the control information, in this case, reliability of transmission data may be higher, but transmission efficiency may be lower due to a smaller number of bits of information to be transmitted.

Therefore, the number of symbols occupied by the PSFCH in each slot, and hence the number of available symbols for the PSSCH, i.e., the target number of valid REs in each slot, can be determined based on the possible number of available symbols in the slot occupied by the PSSCH.

That is, when N is 0, the number of possible available symbols on the slot occupied by the psch among the number of available symbols on the psch on each slot is 12 symbols. When N is 1, the number of possible available symbols on the slot occupied by the psch is 9 symbols among the number of available symbols on the psch on each slot. When N is 2, the possible number of available symbols on the slot occupied by the psch is 9 symbols or 12 symbols among the number of available symbols on the psch on each slot. When N is 4, the possible number of available symbols on the slot occupied by the psch is 9 symbols or 12 symbols among the number of available symbols on the psch on each slot.

In this method, since different possibilities exist when N is 2 or N is 4, the number of available symbols on a slot occupied by the pscch may be further indicated by the sidelink control information at different periods of the feedback channel, and further, the target number of valid REs on each slot may be determined, thereby improving the accuracy of determining the TBS.

It should be noted that the control information may be SCI transmitted on PSCCH. For example, a field is added to the SCI, and the number of occupied symbols per slot of the feedback channel corresponding to the data packet transmitted by the field is indicated by the field. Alternatively, the control information may be carried in the header of the data packet. But additional resource overhead may be incurred due to the need to additionally transmit side row control information.

The method 4 comprises the following steps: the symbol overhead of the feedback channel on each slot is to indicate that 0 or 3 symbols are occupied.

Another possible implementation could be to determine the target number of valid REs per slot by SCI indicating whether to subtract 3 PSFCH symbols from the available symbols on the PSSCH occupied slot.

In this method, when N is 0,1,2 or 4, the number of symbols occupied by 3 PSFCHs may be subtracted from the number of available symbols on the slot occupied by the PSSCH depending on whether the dynamic indication indicates that the number of symbols occupied by the PSFCH is equal to or less than the target number of valid REs on each slot. Alternatively, the number of symbols occupied by 0 or 3 PSFCHs may be subtracted from the number of symbols available on the slot occupied by the psch as dynamically indicated.

In a possible implementation manner, the originating device may send first-order sidelink control information to the receiving device, so that the receiving device may determine whether to subtract the number of symbols occupied by 3 PSFCHs from the number of available symbols in the timeslot occupied by the PSSCH during the blind detection process, so that the receiving device demodulates the first data sent by the originating device on the sidelink resource according to the first-order SCI.

Specifically, it can be indicated by 1bit whether to subtract the number of symbols occupied by 3 PSFCHs from the number of symbols available on the slot occupied by the PSSCH. For example, by 0 carried in 1 dedicated indication bit in the sidestream control information, it is indicated that the number of symbols occupied by 0 PSFCH is subtracted from the number of available symbols on the slot occupied by the PSSCH. The number of symbols occupied by 3 PSFCHs is not subtracted from the number of available symbols on the slot occupied by the PSSCH by a1 carried in 1 dedicated indicator bit in the sidestream control information.

In another possible implementation, other indicator bits in the sidelink control information may be multiplexed to indicate whether to subtract the number of symbols occupied by 3 PSFCHs from the number of available symbols on the slot occupied by the PSSCH. And are not limited herein.

For example, if the SCI indicates that the number of symbols occupied by 3 PSFCHs is subtracted from the number of symbols available on the slot occupied by the PSSCH, the number of symbols available on the PSSCH can be determined to be 9 symbols. If the number of symbols occupied by 3 PSFCHs is not subtracted from the number of symbols available on the slot occupied by the PSSCH as indicated in the sidelink control information, the number of symbols available on the PSSCH can be determined to be 12 symbols.

In this approach, a higher flexibility is provided compared to method 3, which helps to achieve a target TBS with a target spectral efficiency more flexibly. In the scenario where N is 0 and N is 1, dynamic indication is also required, which may cause waste of resources compared to other methods, or if N is 0, the number of symbols occupied by 3 PSFCHs is indicated to be subtracted from the number of available symbols on the slot occupied by the PSSCH, which results in a small number of information bits to be transmitted, resulting in low transmission efficiency and insufficient resource utilization. If N is 1, it is indicated that the number of symbols occupied by 3 PSFCHs is not subtracted from the number of symbols available in the slot occupied by the PSSCH, which results in a large number of information bits to be transmitted, resulting in high transmission efficiency but low reliability.

The method 5 comprises the following steps: the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is an integer.

To improve the accuracy of determining the TBS and the flexibility of determining the target number of valid REs, one possible approach may be to determine the number of available symbols of the PSSCH per slot by dynamically indicating whether to subtract 1 to 3 PSFCH symbols from the number of available symbols of the PSSCH per slot. In this method, the number of PSSCH available symbols per slot is a variable value. For example, as shown in table 2, when N is equal to 0, the SCI indicating that 1 to 3 PSFCH symbols are subtracted from the number of available symbols of the PSSCH in each slot is not transmitted, so that the receiving end device can determine the number of available symbols of the PSSCH in each slot without subtracting 1 to 3 PSFCH symbols, that is, the number of available symbols of the PSSCH in each slot is 12 symbols. When N is 1, the SCI indicating that 3 PSFCH symbols are subtracted from the number of available symbols of the PSSCH per slot is transmitted, and thus, the receiving end device may determine that the number of available symbols of the PSSCH per slot is 9 symbols according to the SCI. When N is 2, the SCI indicating that 2 PSFCH symbols are subtracted from the number of available symbols of the PSSCH per slot is transmitted, and thus, the receiving end device may determine that the number of available symbols of the PSSCH per slot is 10 symbols according to the SCI. When N is 4, the SCI indicating that 1 PSFCH symbol is subtracted from the number of available symbols of the PSSCH per slot is transmitted, and thus, the receiving end device may determine that the number of available symbols of the PSSCH per slot is 11 symbols according to the SCI. In this scheme, the average value closer to the actual overhead is a more stable TBS determination method.

Of course, the SCI indicating the symbol obtained by subtracting 0-3 PSFCHs from the available symbol number of PSSCH in each slot may be sent to the receiving device in different periods of the feedback channel according to the actual situation of the slot occupied by the first data. For example, in one possible scenario, it may be indicated that in N-0, 1,2,4, 0 symbols of the PSFCH are subtracted from the number of available symbols of the PSSCH on each slot to achieve maximum data throughput. Alternatively, it may be indicated that 0 symbols of the PSFCH are subtracted from the number of available symbols of the PSSCH per slot when N is 0, and 3 symbols of the PSFCH are subtracted from the number of available symbols of the PSSCH per slot when N is 1,2,4, in order to achieve the highest data reliability. Of course, it is also possible to subtract 2 symbols of the PSFCH from the number of available symbols of the PSSCH per slot when N is 1,2,4, and so on. Can be indicated according to actual needs and is not limited herein. However, in this scheme, since dynamic indication is required at each cycle of the feedback channel, the overhead of resources is wasted.

TABLE 2

	N＝0	N＝1	N＝2	N＝4
					Method 1	0	3	2	1
Method 2	0	3	0	0
					Method 3	0	3	0 or 3	0 or 3
Method 4	0	3	0 or 3	0 or 3
					Method 5	0	3	2	1
Actual cost mean	0	3	1.5	0.75

By adopting the method, the network equipment or the terminal equipment can select different methods for determining the symbol number R according to the practical application scene, further determine the symbol number occupied by the feedback channel on each time slot to achieve the purpose of adjusting the TBS, and prevent the calculated TBS from being too large or too small.

Based on the method for determining the symbol overhead of the feedback channel on each time slot in the above 5 methods, in the embodiment of the present application, the symbol overhead of the feedback channel on each time slot in the time slot of the first data sent by the first terminal device may be indicated according to a dynamic indication manner, for example, a manner that the network device sends downlink control information to the first terminal device or the second terminal device. The method may further indicate, in the time slot of the first data sent by the first terminal device, a symbol overhead of a feedback channel on each time slot in a manner of the sideline control information sent by the first terminal device to the second terminal device.

Based on the different number of methods selected, the bits occupied by different control information can be configured. For example, if 2 methods are selected among the M methods, control information indicating symbol overhead of a feedback channel on each slot may occupy 1 bit. If 3-4 methods are selected among the M methods, the control information indicating the symbol overhead of the feedback channel on each slot may occupy 2 bits. If more than 5 methods are selected among the M methods, the control information indicating the symbol overhead of the feedback channel on each slot may occupy 3 bits.

Different methods may be indicated by the side-row control information as exemplified below. In one possible implementation, the first information is obtained by side-row control information. The SCI occupies L bits, indicating one item from any at least 2 of the following ways:

the symbol overhead of the feedback channel on each time slot is 0 symbol;

the symbol overhead of the feedback channel on each time slot is 1 symbol;

the symbol overhead of the feedback channel on each time slot is 2 symbols;

the symbol overhead of the feedback channel on each time slot is 3 symbols;

the symbol overhead of the feedback channel on each slot is indicated by the maximum number of symbols occupied by the data channel in each slot.

When the control information resource is sufficient and the requirement for determining the accuracy of the TBS is high, more bits can be configured for the sideline control information, so that more methods can be configured in the sideline control information, thereby improving the flexibility and accuracy of determining the symbol number R, further improving the data transmission performance and improving the resource utilization rate.

Several of the possible options for M methods to determine the symbol overhead of the feedback channel on each slot are described in detail below.

Example a1, the SCI occupies 3 bits, the SCI indicates one of:

the method comprises the following steps: the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period;

the method 2 comprises the following steps: the symbol of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot;

method a 1: the symbol overhead of the feedback channel on each time slot is 0 symbol;

method a 2: the symbol overhead of the feedback channel on each time slot is 1 symbol;

method a 3: the symbol overhead of the feedback channel on each time slot is 2 symbols;

method a 4: the symbol overhead of the feedback channel on each slot is 3 symbols.

In the above example a1, by combining all the methods of dynamic indication specified in method 3, method 4 and method 5, the 4 possible methods can be determined to be method a 1-method a 4. Thus, in example a1, a flexible way of indicating the symbol overhead of the feedback channel per slot possible in various data transmission environments can be achieved, and even a less accurate TBS estimation can still meet the data transmission requirements in case of sufficient time-frequency resources or low peak throughput requirements. However, under the condition of short time-frequency resources or high peak throughput requirement, the TBS needs to be calculated more accurately, and a subsequent rate matching method is matched to achieve higher peak throughput. The waste of time frequency resources is avoided, and data overflow caused by TBS estimation errors is also avoided. In example a1, both the method of method 1 and method 2 for determining the symbol overhead of the feedback channel on each time slot correspondingly under different periods of the feedback channel and the method of method 3, method 4 and method 5 for dynamically indicating the symbol overhead of the feedback channel on each time slot with different accuracies are included, so as to meet the requirement of different configurations for the accuracy of the TBS calculation.

It should be noted that when the SCI occupies 3 bits, 2 redundancy methods may still be selected from the SCI, and at this time, the method may be a determination method of other available PSSCH symbol numbers, and may also carry information such as indication information and redundancy check of other SCIs, which is not limited herein.

Example a2, the SCI occupying 2 bits, the first information indicating one of: method a 1: the symbol overhead of the feedback channel on each time slot is 0 symbol; method a 2: the symbol overhead of the feedback channel on each time slot is 1 symbol; method a 3: the symbol overhead of the feedback channel on each time slot is 2 symbols; method a 4: the symbol overhead of the feedback channel on each slot is 3 symbols.

In the above example a2, by combining all the methods of dynamic indication specified in method 3, method 4 and method 5, the 4 possible methods can be determined to be method a 1-method a 4. Thus, in example a2, a flexible method of indicating symbol overhead of a feedback channel on each slot possible in various data transmission environments may be achieved while reducing resource overhead of the sidestream control information.

Example a3, the SCI occupying 2 bits, the first information indicating one of:

the method 2 comprises the following steps: the sign of the feedback channel on each slot is indicated by the maximum number of symbols occupied by the data channel on each slot.

The method 3 comprises the following steps: the symbol overhead of the feedback channel on each time slot is 0 or 3 symbols;

in the above-mentioned example a3, by including method 1, method 2, and method 3, it may be indicated to adopt method 1 when stable data transmission is required, it may be indicated to adopt method 2 when maximum throughput of data transmission is required, and it may be indicated to adopt method 3 when it is required to determine symbol overhead of the feedback channel on each slot according to actual situations, so in the above-mentioned example a3, by reducing resource consumption of the sideline control information, it may effectively cover determination of symbol overhead of the feedback channel on each slot under more application scenarios, and improve flexibility of TBS determination.

Example a4, the SCI occupying 1bit, the first information indicating one of:

In the above-mentioned example a4, by including the method 1 and the method 3, it may be indicated to adopt the method 1 when data needs to be stably transmitted, and when the maximum throughput of data transmission is needed, it may be indicated that the symbol overhead of the feedback channel on each slot in the method 3 is 0 symbol, and when the symbol overhead of the feedback channel on each slot needs to be determined according to the actual situation, it may be indicated to adopt the method 3, therefore, in the above-mentioned example a4, by further reducing the resource consumption of the sideline control information, it may cover the determination of the symbol overhead of the feedback channel on each slot in more application scenarios as much as possible, improve the flexibility and the applicable range of the TBS determination, meet the requirements of subsequent different rate matching and coding and decoding, and further improve the data transmission performance on the sideline link as a whole.

Based on the method for determining the symbol overhead of the feedback channel on each slot in the above 5 methods, in the embodiment of the present application, the symbol overhead of the feedback channel on each slot in the slot of the first data sent by the first terminal device may be indicated according to a static or semi-static indication manner, for example, a manner that the network device configures static signaling (for example, RRC signaling or SIB signaling) for the first terminal device or the second terminal device. On the premise of static indication, the symbol overhead of the feedback channel on each slot in the slot of the first data sent by the first terminal device can be further indicated by the SCI sent by the first terminal device to the second terminal device. In this scheme of static or semi-static configuration, it can be ensured that the TBS determination methods of the first terminal device and the second terminal device are consistent, so that the second terminal device can successfully decode the first data transmitted by the first terminal device.

In one possible implementation, the first information indicates one of:

the method 2 comprises the following steps: the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel in each time slot;

the method b: the symbol overhead of the feedback channel on each time slot is indicated by the sideline control information sent by the first terminal device.

In the method b, the method b indicated by the sidelink control information may include multiple methods, and in a possible implementation manner, the first information may further include at least one of the following:

the method 3 comprises the following steps: the symbol overhead of the feedback channel on each time slot is indicated by the possible number of available symbols of the PSSCH on each time slot;

the method 4 comprises the following steps: the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot;

the method 5 comprises the following steps: the symbol overhead of the feedback channel on each time slot is indicated to occupy Q symbols; q is less than or equal to 3; q is a positive integer.

Further, in the method b, the implementation manner of the symbol overhead of the feedback channel on each slot may be determined by referring to the manner indicated by the sidelink control information in the first embodiment. For example, 1bit of sidelink control information may be configured to indicate the symbol overhead of the feedback channel on each slot in method b, or the symbol overhead of the feedback channel on each slot in methods 1-3 in method b. It is also possible to configure 2 bits of sidelink control information for indicating the symbol overhead of the feedback channel on each slot in method b, or the symbol overhead of the feedback channel on each slot in methods 1-3 in method b. And will not be described in detail herein.

Alternative methods are further described below in specific examples b1-b 3.

Example b 1: the first information may include one of:

the method 3 is that the symbol overhead of the feedback channel on each time slot is indicated by the possible available symbol number of the PSSCH on each time slot;

in the method 3, the symbol overhead of the feedback channel on each slot may be further indicated by the sidelink control information.

In example b1, by using the static configuration method 1, the static configuration method 2, and the static configuration method 3, compared to the dynamic indication manner in the first embodiment, overhead of control information is reduced, and the method can be adapted to various scenarios for determining data transmission of a sidelink.

Example b 2:

the method comprises the following steps: the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot;

in example b2, by statically configuring method 1, method 2, and method 4, a variety of scenarios for determining data transmission for the sidelink may be accommodated, for example, three scenarios less more PSFCH overhead, average PSFCH overhead, and less PSFCH overhead may be accommodated.

Specifically, reference may be made to the example in the first embodiment, and details are not described here.

Mode b 4: the first information may include one of:

and 4, the symbol overhead of the feedback channel on each time slot is the number of symbols which the indicated feedback channel possibly occupies on each time slot.

The above example b4 can reduce the statically configured information, and cover more possible scenarios of data transmission of the sidelink, flexibly balance two possible situations while reducing SCI overhead, and meet the requirements of subsequent different rate matching and encoding/decoding.

As shown in fig. 4, an embodiment of the present application provides a data sending and receiving method, and a first terminal device is taken as an originating device, and a second terminal device is taken as a receiving device for example. Taking a sidelink as an example, the originating device may be the UE in fig. 1 a-1 c, and the terminating device may also be the UE in fig. 1 a-1 c, for example, the method is applied to the network architecture shown in fig. 1 a-1 c, the originating device may be any one of UE1-UE3, and the terminating device may be any one of UE1-UE3 except the originating device, and may also be RSU 1; still alternatively, the originating device may be the RSU1, and the terminating device may be any one of the UEs 1-3. The embodiment of the application does not limit the implementation modes of the sending end device and the receiving end device. The method specifically comprises the following steps:

step 401: the first terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to the first information;

wherein the first information is used for indicating the period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship.

Further, the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot corresponds to at least one of the M manners for determining the number of symbols R. Several of the M modes specifically selected can be determined according to actual needs. Here, the number of symbols R may be a positive number.

Step 402: and the first terminal equipment determines the size of the transmission block of the first data according to the symbol number R.

Step 403: and the first terminal equipment sends the first data.

Step 404: and the second terminal equipment determines the symbol number R occupied by the feedback channel in the time slot where the first data is located according to the first information.

Wherein the first information is used for indicating the period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation; thereby, the second terminal device is made to coincide with the first information obtained by the first terminal device.

Step 405: and the second terminal equipment determines the size of the transmission block of the first data according to the symbol number R.

Step 406: and the second terminal equipment demodulates the first data according to the transmission block size.

By the method, the cost of the PSFCH on each time slot can be implicitly associated and indicated by using the value of the feedback period N of the PSFCH, so that the mode of the target effective RE number is determined. And, the feedback period N of different PSFCHs may implicitly indicate the calculation manner of the number of symbols occupied by different feedback channels on each timeslot.

Possible implementations in the present application are described in detail below.

When the period N of the feedback channel is 0, the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot have a corresponding relationship, and may be determined by at least one of the following methods:

the method 2 comprises the following steps: the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of the number of symbols of each time slot occupied by the data channel;

method c 0: the symbol overhead of the feedback channel on each slot is 0 symbols.

By the method, an indication mode that the symbol overhead of the feedback channel on each time slot is 3 symbols does not occur when N is equal to 0, and waste of transmission resources is avoided.

When the period N of the feedback channel is 1, the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot have a corresponding relationship, and may be determined by at least one of the following methods:

method c 1: the symbol overhead of the feedback channel on each slot is 3 symbols.

By the method, when N is 1, an indication mode that the symbol overhead of a feedback channel on each time slot is 0 symbols does not occur, and the reduction of the reliability of data transmission caused by overflow of transmission data is avoided.

When the period N of the feedback channel is 2, the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot have a corresponding relationship, and may be determined by at least one of the following methods:

The method 3 comprises the following steps: the symbol overhead of the feedback channel on each time slot is indicated by the number of symbols possibly occupied on each time slot through the PSSCH;

the method 4 comprises the following steps: the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols;

the method 5 comprises the following steps: the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is a positive number;

method c 2: the symbol overhead of the feedback channel on each slot is 2 symbols.

Method c 3: the symbol overhead of the feedback channel on each slot is 1 symbol.

By the method, the symbol overhead of the feedback channel on each time slot can be better adapted to different data transmission scenes when N is 2.

When the period N of the feedback channel is 4, the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot have a corresponding relationship, and may be determined by at least one of the following methods:

the method 2 comprises the following steps: the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period;

the method 3 comprises the following steps: the symbol overhead of the feedback channel on each slot is indicated by the number of possible symbols available for the psch on each slot.

method c 4: the symbol overhead of the feedback channel on each slot is 1 symbol.

Method c 5: the symbol overhead of the feedback channel on each slot is 2 symbols.

By the method, the symbol overhead of the feedback channel on each time slot can be better adapted to different data transmission scenes when N is 4.

The correspondence relationship between the period of the feedback channel and the number of symbols occupied by the feedback channel in each slot in the embodiment of the present application is illustrated by an example c 1-an example c 7.

Example c 1: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0 or N is 1, corresponding to method 1, the symbol overhead of the feedback channel in each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period.

When N is 2, corresponding to method 5: the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is a positive number.

When N is 4, corresponding to method 2: the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period.

In this example c1, when N is 2, the overhead of the PSFCH subtracted per slot accommodates the overhead of the PSFCH in more scenarios, i.e., the symbol overhead of the PSFCH may include 0,1,2,3 symbols. When N is 4, PSSCH occupies as much time-frequency resource as possible to adapt to higher data transmission rate, without considering PSFCH overhead.

Example c 2: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0, corresponding to method 1: the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period.

When N is 1, corresponding to method 2: the symbol overhead of the feedback channel on each slot is indicated by the maximum number of symbols per slot occupied by the data channel.

When N is 2 and N is 4, method 4 corresponds to: the symbol overhead of the feedback channel on each slot is to indicate that 0 or 3 symbols are occupied.

In this example c2, when N is 2 and N is 4, the overhead of subtracting the PSFCH per slot is relatively close to the overhead of the actual PSFCH, and when there are many slots of the PSFCH, it may indicate that the symbol overhead of the feedback channel on each slot is 3 symbols; when there are more slots without PSFCH, the symbol overhead of the feedback channel on each slot may be indicated to be 0 symbols.

Example c 3: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0 or 1, corresponding to method 1, the symbol overhead of the feedback channel in each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period.

When N is 2, corresponding to method 4: the symbol overhead of the feedback channel on each slot is to indicate that 0 or 3 symbols are occupied.

When N is 4, corresponding to method 2: the symbol overhead of the feedback channel on each slot is indicated by the maximum number of symbols per slot occupied by the data channel.

In this example c3, when N is 2, the overhead of subtracting the PSFCH per slot is closer to the overhead of the actual PSFCH, i.e., the channel with the PSFCH minus 3 symbols and the slot without the PSFCH minus 0 symbol. When N is 4, the overhead of PSFCH is not considered, and PSSCH occupies as much time-frequency resources as possible to adapt to higher data transmission rate.

Example c 4: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0, the number of available symbols of the PSSCH on each slot is 12;

when N is 1, the corresponding relation is that the number of available symbols of the PSSCH on each slot is 9;

when N is 2, the corresponding relation is that the number of available symbols of the PSSCH on each slot is 10;

or when N is 2, the corresponding relationship is that the number of available symbols of the PSSCH on each slot is 11;

or when N is 2, the number of available symbols of the PSSCH in each slot is the decimal of the interval (10, 11);

at this time, another implementation of method c2 is possible.

When N is 4, the corresponding relation is that the number of available symbols of the PSSCH on each slot is 11;

or when N is 4, the corresponding relationship is that the number of available symbols of the PSSCH on each slot is 12;

or when N is 4, the corresponding relation is that the number of available symbols of the PSSCH per slot is the fraction of the interval (11, 12);

at this time, another implementation of method c4 is possible.

In the above example c4, by directly setting the correspondence relationship as the correspondence relationship between the period of the feedback channel and the number of available symbols of the psch on each slot, the complexity of configuring the correspondence relationship can be saved, and the complexity of the terminal device processing can be reduced. When N is 2, the symbol overhead occupied by the feedback channel on each slot is 2 symbols; when N is 4, the symbol overhead occupied by the feedback channel on each slot is 1 symbol.

Example c 5: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0, the number of PSSCH available symbols is 12;

when N is 1, the number of PSSCH available symbols is 9;

when N is 2, method 4 is followed: the symbol overhead of the feedback channel on each slot is to indicate that 0 or 3 symbols are occupied.

When N is 4, method 1 is followed: the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period.

In the above example c5, the correspondence relationship is set directly by a combination of the correspondence relationship of the period of the feedback channel and the number of available symbols of the psch on each slot and a method of setting the correspondence relationship. The complexity of configuring the corresponding relation can be saved, and the flexibility of the corresponding relation is improved. When N is 2, the method of selecting dynamic indication increases the flexibility of determining the symbol overhead of the feedback channel on each slot, and when N is 4, the method of selecting 1 avoids the extra overhead caused by sending control information between terminal devices.

Example c 6: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0, the number of PSSCH available symbols is 12;

when N is 1, the number of PSSCH available symbols is 9;

when N is 2, corresponding to method 4: the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols;

when N is 4, the number of PSSCH available symbols is 11;

or when N is 4, the corresponding relationship is that the number of available symbols of the PSSCH on each slot is 12; or when N is 4, the corresponding relation is that the number of available symbols of the PSSCH per slot is the fraction of the interval (11, 12);

in the above example c6, the correspondence relationship is set directly by a combination of the correspondence relationship of the period of the feedback channel and the number of available symbols of the psch on each slot and a method of setting the correspondence relationship. The complexity of configuring the corresponding relation can be saved, and the flexibility of the corresponding relation is improved. When N is 2, the flexibility of determining the symbol overhead of the feedback channel on each time slot is improved by selecting a dynamic indication mode, and when N is 4, a corresponding relation mode is directly configured, so that the complexity of configuration is reduced, and meanwhile, extra signaling overhead is avoided.

Example c 7: the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel in each time slot may include:

when N is 0, the number of PSSCH available symbols is 12;

when N is 1, the number of PSSCH available symbols is 9;

when N is 2, the number of PSSCH available symbols is 10;

or when N is 2, the corresponding relationship is that the number of available symbols of the PSSCH on each slot is 11; or when N is 2, the number of available symbols of the PSSCH in each slot is the decimal of the interval (10, 11);

when N is 4, corresponding to method 3: the symbol overhead of the feedback channel on each slot is indicated by the number of symbols that may be occupied on each slot by the psch.

In the above example c7, the correspondence relationship is set directly by a combination of the correspondence relationship of the period of the feedback channel and the number of available symbols of the psch on each slot and a method of setting the correspondence relationship. The complexity of configuring the corresponding relation can be saved, and the flexibility of the corresponding relation is improved. When N is 2, the corresponding relationship is directly configured, so that the complexity of configuration is reduced and additional signaling overhead is avoided. When N is 4, the manner of selecting the dynamic indication increases the flexibility of determining the symbol overhead of the feedback channel on each slot.

The data transmitting and receiving method according to the embodiment of the present application is described above with reference to fig. 3b, fig. 3c and fig. 4, and based on the same inventive concept as that of the data transmitting and receiving method, the embodiment of the present application further provides a communication apparatus, as shown in fig. 5, where the communication apparatus 500 includes a processing unit 501 and a transceiving unit 502, and the apparatus 500 can be used to implement the method described in the embodiments applied to the originating device and the receiving device. The apparatus 500 may be located within or be an originating device or a terminating device.

It should be noted that the apparatus in the foregoing embodiment, that is, the apparatus 500, may be an originating device or a terminating device, and may also be a chip applied in the originating device or the terminating device, or other combined devices and components having the functions of the foregoing terminating device. When the apparatus is an originating device or a receiving device, the transceiving unit may be a transceiver, and may include an antenna, a radio frequency circuit, and the like, and the processing module may be a processor, for example: a Central Processing Unit (CPU). When the apparatus is a component having the functions of the transmitting end device or the receiving end device, the transceiver unit may be a radio frequency unit, and the processing module may be a processor. When the apparatus is a chip system, the transceiver unit may be an input/output interface of the chip system, and the processing module may be a processor of the chip system.

In one embodiment, the apparatus 500 is applied to an originating device, and may be a first terminal device in the embodiment of the present application, or a chip of the first terminal device.

Specifically, the processing unit 501 is configured to determine, according to the first information, a symbol number R occupied by a feedback channel in a time slot where the first data is located; wherein the first information is used to indicate one way of determining the symbol number R from M ways of determining the symbol number R, where R and M are positive integers; the first terminal equipment determines the size of a transmission block of the first data according to the symbol number R; a transceiver 502, configured to send the first data.

In one possible implementation, the first information indicates one of: the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel in each time slot; the symbol overhead of the feedback channel in each time slot is indicated by the sideline control information SCI sent by the first terminal device.

In a possible implementation manner, the transceiver unit 502 is further configured to send the SCI; the SCI includes the first information.

In one possible implementation, the SCI occupies L bits, where L is a positive integer; the SCI indicates an item from any at least 2 of the following ways: the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of each time slot occupied by the feedback channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot.

In one possible implementation, the SCI occupies 3 bits, and the SCI indicates one of: the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period; the symbol of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot.

In one possible implementation, the SCI occupies 2 bits, and the first information indicates one of: the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each slot is 3 symbols.

In one possible implementation, the SCI occupies 2 bits, and the first information indicates one of: the symbol overhead of the feedback channel on each time slot is 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of the number of symbols of each time slot occupied by the feedback channel in one period; the symbol of the feedback channel on each time slot is indicated by the maximum value of the number of symbols occupied by the data channel on each time slot.

In one possible implementation manner, the SCI occupies 1bit, and the first information indicates one of: the symbol overhead of the feedback channel on each time slot is 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period.

In a possible implementation manner, the first information is configured or preconfigured by the network-side device before the first terminal device sends the SCI; the first information includes at least one of: the symbol overhead of the feedback channel on each time slot is indicated by the possible available symbol number of the PSSCH on each time slot; the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot; the symbol overhead of the feedback channel on each time slot is indicated to occupy Q symbols; q is less than or equal to 3; q is a positive integer.

In another possible embodiment, the processing unit 501 is configured to determine, according to the first information, a symbol number R occupied by a feedback channel in a time slot where the first data is located, where R is a positive number; the first information is used for indicating the period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation; the first terminal equipment determines the size of a transmission block of the first data according to the symbol number R; a transceiver 502, configured to send the first data.

In one possible implementation, the period of the feedback channel includes N time slots; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items: when N is 0 or 1, the symbol overhead of the feedback channel on each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period; when N is 0 or 1, the symbol overhead of the feedback channel on each slot is indicated by the maximum value of the number of symbols of each slot occupied by the data channel in one period; when N is 0, the symbol overhead of the feedback channel on each timeslot is 0 symbols; when N is 1, the symbol overhead of the feedback channel on each slot is 3 symbols.

In one possible implementation, the period of the feedback channel includes N time slots; n is 2; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items: the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is a positive number; the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is an average value of each time slot occupied by the feedback channel in one period.

In another embodiment, the communication apparatus 500 may be a receiving device, for example, may be a second terminal device, or a chip of the second terminal device.

Specifically, the processing unit 501 is configured to determine, according to first information, a symbol number R occupied by a feedback channel in a time slot where first data is located, where the first information is used to indicate one manner of determining the symbol number R from M manners of determining the symbol number R, where R and M are positive integers; determining the size of a transmission block of the first data according to the symbol number R; a processing unit 501, configured to demodulate the first data according to the transport block size, so as to receive the first data through a transceiver unit 502.

In one possible implementation, the first information indicates one of: the symbol overhead of the feedback channel on each time slot is the average value of each time slot occupied by the feedback channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the sideline control information sent by the first terminal equipment.

Before the processing unit 501 determines the number of symbols R occupied by the feedback channel in the time slot where the first data is located according to the first information, the transceiving unit 502 is further configured to receive sideline control information SCI sent by the first terminal device; the SCI includes the first information.

In one possible implementation, the SCI occupies L bits, where L is a positive integer; the SCI indicates one from any at least 2 of: the symbol overhead of the feedback channel on each time slot is 0 symbol; the symbol overhead of the feedback channel on each time slot is 1 symbol; the symbol overhead of the feedback channel on each time slot is 2 symbols; the symbol overhead of the feedback channel on each time slot is 3 symbols; the symbol overhead of the feedback channel on each time slot is the average value of each time slot occupied by the feedback channel in one period; the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period.

In a possible implementation manner, the first information is configured or preconfigured by the network-side device before the first terminal device sends the SCI; the first information includes at least one of: the symbol overhead of the feedback channel on each time slot is the possible available symbol number of the indicated PSSCH on each time slot; the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot; the symbol overhead of the feedback channel on each time slot is indicated to occupy Q symbols; q is less than or equal to 3; q is a positive integer.

In another possible embodiment, the processing unit 501 is configured to determine, according to first information, a symbol number R occupied by a feedback channel in a time slot where the first data is located, where R is a positive number, and the first information is used to indicate a period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation; the second terminal equipment determines the size of a transmission block of the first data according to the symbol number R; a processing unit 501, configured to demodulate the first data according to the transport block size, so as to receive the first data through a transceiver unit 502.

It should be noted that, the division of the modules in the embodiments of the present application is schematic, and is only a logical function division, and in actual implementation, there may be another division manner, and in addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or may exist alone physically, or two or more units are integrated in 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 computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) 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.

Based on the same concept as the above-mentioned data transmitting and receiving method, as shown in fig. 6, the embodiment of the present application further provides a schematic structural diagram of a communication device 600. The apparatus 600 may be used to implement the method described in the above method embodiment applied to the originating device or the receiving device, and reference may be made to the description in the above method embodiment, where the apparatus 600 may be located in the originating device or the receiving device, and may be the originating device or the receiving device.

The apparatus 600 includes one or more processors 601. The processor 601 may be a general purpose processor or a special purpose processor, etc. For example, a baseband processor, or a central processor. The baseband processor may be used to process communication protocols and communication data, and the central processor may be used to control a communication device (e.g., a base station, a terminal, or a chip), execute a software program, and process data of the software program. The communication device may include a transceiving unit to enable input (reception) and output (transmission) of signals. For example, the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The apparatus 600 includes one or more processors 601, and the one or more processors 601 may implement the method of the originating device or the receiving device in the illustrated embodiments described above.

Optionally, the processor 601 may also implement other functions besides implementing the methods of the above-described illustrated embodiments.

Alternatively, in one design, the processor 601 may execute instructions to cause the apparatus 600 to perform the method described in the above method embodiment. The instructions may be stored in whole or in part within the processor, such as instructions 603, or in whole or in part in a memory 602 coupled to the processor, such as instructions 604, or collectively may cause apparatus 600 to perform the methods described in the above method embodiments, via

instructions

603 and 604.

In yet another possible design, the communication apparatus 600 may also include a circuit, which may implement the functions of the terminal device in the foregoing method embodiments.

In yet another possible design, the apparatus 600 may include one or more memories 602 having instructions 604 stored thereon, which are executable on the processor to cause the apparatus 600 to perform the methods described in the above method embodiments. Optionally, the memory may further store data therein. Instructions and/or data may also be stored in the optional processor. For example, the one or more memories 602 may store the corresponding relations described in the above embodiments, or the related parameters or tables referred to in the above embodiments, and the like. The processor and the memory may be provided separately or may be integrated together.

In yet another possible design, the apparatus 600 may also include a communication interface 605. The processor 601 may be referred to as a processing unit and controls a device (terminal or base station). The communication interface 605 may be referred to as a transceiver, a transceiving circuit, a transceiver, or the like, for implementing transceiving of a device.

For example, if the apparatus 600 is a chip applied in a terminal device or other combined devices, components, etc. having the functions of the terminal device, the apparatus 600 may include the communication interface 605 therein.

In yet another possible design, the apparatus 600 may also include a communication interface 605. The processor 601 may be referred to as a processing unit and controls a device (terminal or base station). The communication interface 605 may be referred to as a transceiver, a transceiving circuit, a transceiver, or the like, for implementing transceiving functions of the apparatus through the antenna 606.

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

It will be appreciated that the memory in 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 RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the present application further provides a computer-readable medium, on which a computer program is stored, where the computer program, when executed by a computer, implements the data sending and receiving method described in any of the method embodiments applied to the originating device or the receiving device.

The embodiments of the present application further provide a computer program product, which, when executed by a computer, implements the data sending and receiving method described in any of the method embodiments applied to the originating device or the receiving device.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The embodiment of the application also provides a communication device, which comprises a processor and an interface; the processor is configured to execute the data sending and receiving method according to any method embodiment applied to the originating device or the receiving device.

It should be understood that the above communication device may be a chip, the processor may be implemented by hardware or may be implemented by software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated in the processor, located external to the processor, or stand-alone.

Claims

1. A data transmission method, comprising:

the first terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to the first information; wherein the first information is used to indicate one way of determining the symbol number R from M ways of determining the symbol number R, where R and M are positive integers;

the first terminal equipment determines the size of a transmission block of the first data according to the symbol number R;

and the first terminal equipment sends the first data.

2. The method of claim 1, wherein the first information is obtained by the first terminal device through configured signaling or pre-configured signaling; or, the first information is information configured on a resource pool.

3. The method of claim 2, wherein the first information indicates one of:

the symbol overhead of the feedback channel in each time slot is indicated by the sideline control information SCI sent by the first terminal device.

4. The method of any one of claims 1-3, further comprising:

the first terminal equipment sends SCI; the SCI includes the first information.

5. The method of claim 4, wherein the SCI occupies L bits, where L is a positive integer; the SCI indicates an item from any at least 2 of the following ways:

the symbol overhead of the feedback channel on each time slot is 0 symbol;

the symbol overhead of the feedback channel on each time slot is 1 symbol;

the symbol overhead of the feedback channel on each time slot is 2 symbols;

the symbol overhead of the feedback channel on each time slot is 3 symbols;

6. The method according to any of claims 3 to 4, wherein the first information is configured or preconfigured by the first terminal device at a network side device prior to sending the SCI; the first information includes at least one of:

the symbol overhead of the feedback channel on each time slot is indicated by the possible available symbol number of the PSSCH on each time slot; or,

the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot; or,

the symbol overhead of the feedback channel on each time slot is indicated to occupy Q symbols; q is less than or equal to 3; q is a positive integer.

7. A data transmission method, comprising:

the first terminal equipment determines the number R of symbols occupied by a feedback channel in a time slot where the first data is located according to the first information, wherein the R is a positive number; the first information is used for indicating the period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation;

and the first terminal equipment sends the first data.

8. The method of claim 7, wherein the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel on each slot corresponds to at least one of the M ways of determining the number of symbols R; and M is a positive integer.

9. The method of claim 7 or 8, wherein the period of the feedback channel comprises N time slots; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the method comprises the following steps:

when N is 0 or 1, the symbol overhead of the feedback channel on each time slot is an average value of the number of symbols of each time slot occupied by the feedback channel in one period; or,

when N is 0 or 1, the symbol overhead of the feedback channel on each slot is indicated by the maximum value of the number of symbols of each slot occupied by the data channel in one period; or,

when N is 0, the symbol overhead of the feedback channel on each timeslot is 0 symbols; when N is 1, the symbol overhead of the feedback channel on each slot is 3 symbols.

10. The method of claim 7 or 8, wherein the period of the feedback channel comprises N time slots; n is 2; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is an integer;

the symbol overhead of the feedback channel on each time slot is that the indication occupies 0 or 3 symbols;

the symbol overhead of the feedback channel on each time slot is 2 symbols;

the symbol overhead of the feedback channel on each time slot is an average value of each time slot occupied by the feedback channel in one period.

11. The method of claim 7 or 8, wherein the period of the feedback channel comprises N time slots; n is 4; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period;

the symbol overhead of the feedback channel on each time slot is 1 symbol;

the symbol overhead of the feedback channel on each slot is the number of symbols available to indicate the possible psch on each slot.

12. A data receiving method, comprising:

the second terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to first information, wherein the first information is used for indicating one mode for determining the symbol number R from M modes for determining the symbol number R, and R and M are positive integers;

the second terminal equipment determines the size of a transmission block of the first data according to the symbol number R;

and the second terminal equipment demodulates the first data according to the transmission block size.

13. The method of claim 12, wherein the first information is obtained by the second terminal device through a signaling configured by a network side device or a pre-configured signaling; or, the first information is information configured on a resource pool.

14. The method of claim 13, wherein the first information indicates one of:

the symbol overhead of the feedback channel on each time slot is indicated by the sideline control information sent by the first terminal equipment.

15. The method according to claim 12 or 13, wherein before the second terminal device determines the number R of symbols occupied by the feedback channel in the time slot in which the first data is located according to the first information, the method further comprises:

16. The method of claim 15, wherein the SCI occupies L bits, L being a positive integer; the SCI indicates one from any at least 2 of:

the symbol overhead of the feedback channel on each time slot is 0 symbol;

the symbol overhead of the feedback channel on each time slot is 1 symbol;

the symbol overhead of the feedback channel on each time slot is 2 symbols;

the symbol overhead of the feedback channel on each time slot is 3 symbols;

the symbol overhead of the feedback channel on each time slot is indicated by the maximum value of each time slot occupied by the data channel in one period.

17. The method according to any of claims 12 to 15, wherein the first information is configured or preconfigured by the first terminal device at a network side device before sending the SCI; the first information includes at least one of:

the symbol overhead of the feedback channel on each time slot is the possible available symbol number of the indicated PSSCH on each time slot;

the symbol overhead of the feedback channel on each time slot is the number of symbols which may be occupied by the indicated feedback channel on each time slot;

18. A data receiving method, comprising:

the second terminal equipment determines the symbol number R occupied by a feedback channel in the time slot where the first data is located according to first information, wherein the R is a positive number, and the first information is used for indicating the period of the feedback channel; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relation;

19. The method of claim 18, wherein the correspondence between the period of the feedback channel and the number of symbols occupied by the feedback channel on each slot corresponds to at least one of M ways of determining the number of symbols R; and M is a positive integer.

20. The method of claim 18 or 19, wherein the period of the feedback channel comprises N time slots; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the method comprises the following steps:

when N is 0 or N is 1, the symbol overhead of the feedback channel on each time slot is an average value of each time slot occupied by the feedback channel in one period; or,

when N is 0 or 1, the symbol overhead of the feedback channel on each timeslot is indicated by a maximum value of each timeslot occupied by the data channel in one period; or,

21. The method of claim 18 or 19, wherein the period of the feedback channel comprises N time slots; n is 2; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

the symbol overhead of the feedback channel on each time slot is that Q symbols are occupied by the indication; q is less than or equal to 3; q is a positive integer;

the symbol overhead of the feedback channel on each time slot is 2 symbols;

22. The method of claim 18 or 19, wherein the period of the feedback channel comprises N time slots; n is 4; the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot have a corresponding relationship, and the period of the feedback channel and the number of symbols occupied by the feedback channel on each time slot include one of the following items:

the symbol overhead of the feedback channel on each time slot is 1 symbol;

23. A communication device comprising a processor and a memory;

the memory is used for storing computer execution instructions;

the processor is configured to execute computer-executable instructions stored by the memory to cause the communication device to perform the method of any of claims 1-11.

24. A communication device comprising a processor and a memory;

the memory is used for storing computer execution instructions;

the processor is configured to execute computer-executable instructions stored by the memory to cause the communication device to perform the method of any of claims 12 to 22.

25. A communication device comprising a processor and interface circuitry;

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor; the processor executes the code instructions to perform the method of any of claims 1 to 11.

26. A communication device comprising a processor and interface circuitry;

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor; the processor executes the code instructions to perform the method of any of claims 12 to 22.

27. A readable storage medium for storing instructions that, when executed, cause the method of any one of claims 1-11 to be implemented.

28. A readable storage medium for storing instructions that, when executed, cause the method of any one of claims 12-22 to be implemented.