CN114258698A

CN114258698A - Cache clearing method, cache processing method and device and terminal equipment

Info

Publication number: CN114258698A
Application number: CN201980099437.6A
Authority: CN
Inventors: 赵振山; 卢前溪; 林晖闵
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-10-12
Filing date: 2019-10-28
Publication date: 2022-03-29
Also published as: WO2021068301A1

Abstract

The embodiment of the application provides a method for clearing a cache, a processing method of the cache, a device and a terminal device, wherein the method comprises the following steps: the method comprises the steps that first terminal equipment receives first indication information, wherein the first indication information is used for determining a first moment when a cache is emptied; the cache is used for storing the side line data received by the first terminal device.

Description

Cache clearing method, cache processing method and device and terminal equipment

Technical Field

The embodiment of the application relates to the technical field of mobile communication, in particular to a method for clearing a cache, a processing method and a processing device of the cache, and terminal equipment.

Background

In New wireless (NR) -Vehicle to other devices (V2X) systems, a side-row feedback mechanism is introduced. For transmission supporting side-line feedback, a receiving end sends Hybrid Automatic Repeat reQuest (HARQ) feedback information to a transmitting end according to a detection result of a Physical side-line Shared Channel (psch), where the HARQ feedback information may be Acknowledgement (ACK) information or Negative Acknowledgement (NACK) information.

If the receiving end sends NACK information to the sending end, the receiving end does not empty the data in the cache, but waits for the sending end to send the retransmission data of the data, but if the receiving end does not receive the retransmission data sent by the sending end any more, at this time, if the receiving end does not empty the data in the cache all the time, resource waste will result.

Disclosure of Invention

The embodiment of the application provides a method for clearing a cache, a processing method and a processing device of the cache, and terminal equipment.

The method for clearing the cache provided by the embodiment of the application comprises the following steps:

the method comprises the steps that first terminal equipment receives first indication information, wherein the first indication information is used for determining a first moment when a cache is emptied;

the cache is used for storing the side line data received by the first terminal device.

The cache processing method provided by the embodiment of the application comprises the following steps:

the method comprises the steps that first terminal equipment receives first side line data, the first terminal equipment determines to empty or use a Buffer according to a first criterion, and the first side line data is first Transmission or retransmission of a Transmission Block (TB).

The device for clearing the cache provided by the embodiment of the application is applied to first terminal equipment, and comprises:

the receiving unit is used for receiving first indication information, and the first indication information is used for determining a first moment for emptying the cache;

The processing apparatus for cache provided in the embodiment of the present application is applied to a first terminal device, and the apparatus includes:

a receiving unit for receiving first side row data;

and the processing unit is used for determining to empty or use the cache according to a first criterion, wherein the first side row data is the first transmission or retransmission of one transmission block.

The terminal device provided by the embodiment of the application comprises a processor and a memory. The memory is used for storing computer programs, and the processor is used for calling and running the computer programs stored in the memory and executing the method for emptying the cache.

The chip provided by the embodiment of the application is used for realizing the method for clearing the cache.

Specifically, the chip includes: and the processor is used for calling and running the computer program from the memory so that the equipment provided with the chip executes the method for clearing the cache.

The computer-readable storage medium provided in the embodiments of the present application is used for storing a computer program, and the computer program enables a computer to execute the above-mentioned method for emptying a cache.

The computer program product provided by the embodiment of the present application includes computer program instructions, and the computer program instructions enable a computer to execute the method for clearing a cache.

The computer program provided in the embodiments of the present application, when running on a computer, enables the computer to execute the above method for emptying a cache.

Through the technical scheme, the first terminal device (namely the receiving end of the sideline data) can determine the first moment for emptying the cache according to the received first indication information, and further can empty the cache at the first moment, so that the waste of resources can be avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application;

FIG. 2-1 is a schematic diagram of mode A provided by an embodiment of the present application;

FIG. 2-2 is a schematic diagram of mode B provided by embodiments of the present application;

FIG. 3-1 is a schematic unicast diagram provided by an embodiment of the present application;

fig. 3-2 is a schematic multicast diagram provided in an embodiment of the present application;

3-3 are broadcast diagrams provided by embodiments of the present application;

3-4 are schematic diagrams of feedback based on unicast transmission provided by embodiments of the present application;

fig. 4 is a schematic flowchart of a method for emptying a cache according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an apparatus for clearing a cache according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of a cache processing method according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a processing apparatus for caching according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a chip of an embodiment of the present application;

fig. 10 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a system, a 5G communication system, a future communication system, or the like.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal 120 (or referred to as a communication terminal, a terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminals located within the coverage area. Optionally, the Network device 110 may be an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the Network device may be a mobile switching center, a relay station, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a future communication system, and the like.

The communication system 100 further comprises at least one terminal 120 located within the coverage area of the network device 110. As used herein, "terminal" includes, but is not limited to, connection via a wireline, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a Digital cable, a direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal that is arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal can refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, User terminal, wireless communication device, User agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal in a 5G network, or a terminal in a future evolved PLMN, etc.

Optionally, a Device to Device (D2D) communication may be performed between the terminals 120.

Alternatively, the 5G communication system or the 5G network may also be referred to as a New Radio (NR) system or an NR network.

Fig. 1 exemplarily shows one network device and two terminals, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminals within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal 120 having a communication function, and the network device 110 and the terminal 120 may be the specific devices described above and are not described again here; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions related to the embodiments of the present application are described below.

Device-to-Device (Device to Device, D2D)

The D2D communication is based on Sidelink (SL) transmission technology, and unlike the traditional cellular system in which communication data is received or sent through a base station, the car networking system adopts the D2D communication mode (i.e. the device-to-device direct communication mode), so that the frequency spectrum efficiency is higher and the transmission delay is lower. For D2D communication, the Third Generation Partnership Project (3 GPP) defines two modes of transmission: mode a and mode B. Mode a and mode B are described below.

Mode A: as shown in fig. 2-1, the transmission resource of the terminal device is allocated by the base station, and the terminal device transmits data on the sidelink according to the resource allocated by the base station; the base station may allocate resources for single transmission to the terminal device, or may allocate resources for semi-static transmission to the terminal device.

And (3) mode B: as shown in fig. 2-2, the terminal device selects a resource from the resource pool to transmit data. Specifically, the terminal device may select the transmission resource in the resource pool by an interception method, or select the transmission resource in the resource pool by a random selection method.

NR-V2X

In NR-V2X, autonomous driving needs to be supported, and thus higher requirements are placed on data interaction between vehicles, such as higher throughput, lower latency, higher reliability, greater coverage, more flexible resource allocation, and the like.

In the NR-V2X system, a plurality of transmission modes are introduced, including mode 1 and mode 2, where mode 1 is that the network device allocates transmission resources to the terminal device (corresponding to mode a above) and mode 2 is that the terminal device selects transmission resources (corresponding to mode B above).

LTE-V2X supports broadcast transmission, and in addition, unicast and multicast transmission are introduced in NR-V2X. For the unicast transmission mode, the receiving end has only one terminal device, and as shown in fig. 3-1, unicast transmission is performed between UE1 and UE 2. For the multicast transmission mode, the receiving end is all the terminal devices in a communication group, or all the terminal devices within a certain transmission distance, as shown in fig. 3-2, UE1, UE2, UE3 and UE4 form a communication group, where UE1 transmits data, and the other terminal devices in the communication group are all receiving ends. For the broadcast transmission mode, the receiving end is any terminal device, as shown in fig. 3-3, where the UE1 is the transmitting end, and other terminal devices around the UE are all receiving ends.

Side feedback channel

In NR-V2X, a side-row feedback channel is introduced for improved reliability. For example, for unicast transmission, a transmitting end transmits uplink data to a receiving end, the receiving end transmits HARQ feedback information (ACK information or NACK information) to the transmitting end, and the transmitting end determines whether data retransmission is required according to the feedback information transmitted by the receiving end. The HARQ Feedback information is carried in a Sidelink Feedback Channel, for example, a Physical Sidelink Feedback Channel (PSFCH), see fig. 3-4.

In an embodiment, the sidestream feedback may be activated or deactivated by pre-configuration information or network configuration information. And if the side line feedback is activated, the receiving end receives the side line data sent by the sending end, and feeds back ACK (acknowledgement) information or NACK (negative acknowledgement) information to the sending end according to the detection result, and the sending end determines to send retransmission data or new data according to the feedback information of the receiving end. If the side-line feedback is deactivated, the receiving end does not need to send feedback information, and the sending end usually sends data in a blind retransmission mode, for example, the sending end repeatedly sends K times to each side-line data, where K is a positive integer greater than 1, instead of determining whether to send retransmission data according to the feedback information of the receiving end.

HARQ scheme

The receiving end receives the side-line data sent by the sending end, the receiving end needs to buffer the received side-line data, and judges whether the PSSCH scheduled by the PSCCH needs to be detected according to the detection result of a Physical side-line Control Channel (PSCCH). For transmission supporting the side-line feedback, the receiving end sends HARQ feedback information (ACK information or NACK information) to the sending end according to the detection result of the PSSCH, and if the receiving end sends NACK information, the receiving end needs to cache the side-line data carried by the PSSCH, and combine and decode the side-line data and the side-line data retransmitted by the sending end to determine whether the side-line data is correctly received.

Each sideline data transmission corresponds to one HARQ process number, and the maximum HARQ process supported by the terminal device is limited, for example, the terminal device supports a maximum of 8 HARQ processes. For a certain HARQ process, only when the receiving end receives the New Data Indicator (NDI) inversion corresponding to the HARQ process, the receiving end clears the cache corresponding to the HARQ process.

In the LTE-V2X system, broadcast transmission is mainly supported, and a Sidelink Control Information (SCI) indicates the first transmission and all retransmissions of data at the same time, so that a receiving end can know all transmission resources of the data when receiving the SCI, and buffer, combine, decode, etc. the data transmitted each time to determine whether the data is correctly received, and when the receiving end receives the last data transmission of the data, the buffer is emptied to receive other data.

However, in the NR-V2X system, a side-line feedback mechanism is introduced, and when a receiving end feeds back NACK information to a sending end, the receiving end does not empty the data in the buffer, but waits for the sending end to send retransmission data of the data, but if the receiving end no longer receives the retransmission data of the sending end for the data, for example, the distance between the sending end and the receiving end is longer and longer, at this time, if the receiving end does not empty the data in the buffer, resource waste may be caused. Therefore, the following technical scheme of the embodiment of the application is provided, and the technical scheme of the embodiment of the application can be applied to an NR-V2X system but is not limited to the application.

Fig. 4 is a schematic flowchart of a method for clearing a cache according to an embodiment of the present application, and as shown in fig. 4, the method for clearing the cache includes the following steps:

step 401: the method comprises the steps that first terminal equipment receives first indication information, wherein the first indication information is used for determining a first moment when a cache is emptied; the cache is used for storing the side line data received by the first terminal device.

In this embodiment of the application, the first terminal device is a side line data receiving end, and after the receiving end receives the side line data sent by the sending end, the received side line data needs to be cached down. If the first terminal device receives the first indication information, the first terminal device may determine a first time for clearing the cache according to the first indication information.

In this embodiment of the application, the first terminal device receiving the first indication information may be implemented in any one of the following manners:

the first method is as follows: and the first terminal equipment receives the first indication information sent by the network equipment.

In an alternative embodiment, the network device may be a base station, such as a gNB.

In an optional embodiment, the first indication Information is carried in Radio Resource Control (RRC) signaling or Downlink Control Information (DCI).

In specific implementation, the network device sends the first indication information to the first terminal device through RRC signaling or DCI.

The second method comprises the following steps: and the first terminal equipment receives the first indication information sent by the second terminal equipment.

In an optional implementation manner, the second terminal device is a terminal device that transmits the sidestream data. In another optional implementation manner, the second terminal device is a head terminal device of a communication group in which the first terminal device is located. The group head terminal device is a terminal device having functions of resource management, resource scheduling, resource allocation and the like in one communication group.

In an optional embodiment, the first indication information is carried in SCI or sidestream RRC signaling.

In a specific implementation, the second terminal device sends the first indication information to the first terminal device through SCI or sidestream RRC signaling.

In this embodiment of the application, the first indication information is used to determine a first time for emptying the cache, and a specific implementation of the first indication information is described below.

● the first indication information is time slot indication information

1) In an optional embodiment, the timeslot indication information includes a System Frame Number (SFN) and a timeslot Number.

Based on this, the first terminal device determines a first time slot according to the SFN and the time slot number, and empties the buffer at a time corresponding to the first time slot.

It should be noted that, the time corresponding to the first time slot here is the first time in the above scheme.

2) In another alternative embodiment, the slot indication information includes a Direct Frame Number (DFN) and a slot Number.

Based on this, the first terminal device determines a second time slot according to the DFN and the time slot number, and empties the buffer at a time corresponding to the second time slot.

It should be noted that, a time corresponding to the second timeslot is the first time in the above scheme.

For both modes 1) and 2), the SFN or DFN is used to determine a Frame (Frame), and the timeslot number is used to determine a timeslot within the Frame. Where a frame includes 10 subframes (subframes), each subframe being 1ms, and a SFN or DFN period includes 1024 frames, numbered 0,1, …, 1023. The number of slots included in each frame is related to the underlying parameter set (numerology), e.g., if the subcarrier spacing is 15kHz, one subframe includes 10 slots, and the corresponding slot number is 0,1, …, 9; if the sub-carrier spacing is 30kHz, one sub-frame comprises 20 time slots, and the corresponding time slot numbers are 0,1, … and 19; if the subcarrier spacing is 60Hz, one subframe includes 40 slots, and the corresponding slot numbers are 0,1, …, 39; and so on.

The first terminal device may determine a position of a timeslot according to the SFN or DFN and the timeslot number in a frame, and therefore, the first terminal device may empty the buffer at a time corresponding to the timeslot.

● the first indication information is a slot offset indication information

Based on this, the first terminal device determines the first time according to the timeslot offset indication information and the reference time, and empties the buffer at the first time.

In an optional embodiment, the timeslot offset indication information is used to indicate N timeslots, where N is a positive integer; the reference time and the first time are separated by the N time slots.

Here, the length of the timeslot in the timeslot offset indication information is determined according to a basic parameter set corresponding to the sideline data transmission. Further, the base parameter set includes at least a subcarrier spacing.

For example, if the subcarrier interval corresponding to the sidelink data transmission is 30kHz, one slot corresponds to a time length of 0.5ms, and accordingly, the length of the slot in the slot offset indication information is 0.5 ms. If the slot offset indication information indicates 10 slots (i.e., N is 10) and the reference time is slot 3, the first terminal device empties the buffer at the time corresponding to the 13 th slot.

In an alternative embodiment, the reference time is one of:

the time when the first terminal equipment receives the signaling carrying the time slot offset indication information;

the time corresponding to the frame number 0 and the time slot number 0 in one SFN period;

the time corresponding to the frame number 0 and the time slot number 0 in one DFN period;

the time corresponding to the time slot number 0.

Note that, if the reference time is a time corresponding to the time slot number 0, the time slot number 0 in any one frame may be used as the reference time. The terminal can determine the positions of a plurality of moments according to the time slot offset information and the moment with the time slot number of 0, and preferably, the terminal takes the first available moment as the moment for emptying the buffer. For example, if the number of time slots indicated by the time slot offset indication information is 3 and the reference time is the time of time slot number 0, the terminal may determine that all the 3 rd time slots in each frame are the possible time to empty the buffer, and if the terminal receives the first indication information in the 2 nd time slot in the frame and the processing delay of the terminal is 2 time slots, the terminal has not processed the received data in the 3 rd time slot in the frame, so the terminal takes the 3 rd time slot in the next frame as the time to empty the buffer.

● the first indication information is a first parameter M, wherein M is a positive integer.

Based on this, the first terminal equipment acquires a second parameter K; wherein K is a positive integer; and the first terminal equipment determines the first moment according to the first parameter M and the second parameter K, and empties the cache at the first moment.

In this embodiment of the application, the first terminal device determines the first time according to the first parameter M and the second parameter K, which may be implemented by, but is not limited to:

1) in an optional embodiment, the first terminal device regards a K × M +1 time slot after the time when the first indication information is received as the first time; and the first terminal equipment empties the cache at the first moment.

2) In another optional embodiment, the first terminal device regards the K × M +1) -1 time slot after the time when the first indication information is received as the first time; and the first terminal equipment empties the cache at the first moment.

3) In yet another optional embodiment, the first terminal device regards the K × M-1 time slot after the time when the first indication information is received as the first time; and the first terminal equipment empties the cache at the first moment.

4) In yet another optional embodiment, the first terminal device regards the K × M time slots after the time when the first indication information is received as the first time; and the first terminal equipment empties the cache at the first moment.

In the above scheme, when K is 1, that is, the first time is determined only according to the first parameter M.

In this embodiment of the application, the obtaining, by the first terminal device, the second parameter K includes:

the first terminal device obtains the second parameter K according to the resource pool configuration information, or,

the first terminal device obtains the second parameter K according to the network configuration information, or,

the first terminal device obtains the second parameter K according to the priority information, or,

the first terminal device obtains the second parameter K according to the time delay information, or,

the first terminal device obtains the second parameter K according to a Channel Busy Ratio (CBR), or,

and the first terminal equipment acquires the second parameter K according to the periodic parameter of the sidestream feedback channel.

Wherein the priority information is determined according to the priority in the SCI received by the first terminal device. The period parameter of the side row feedback channel refers to that a plurality of side row time slots comprise a time slot for transmitting the side row feedback channel. For example, the period parameter is 4, which means that every 4 side-row time slots include a time slot for transmitting the side-row feedback channel.

Optionally, the first parameter M in the above scheme is a number of slots or a number of slot intervals. The first terminal device may determine a first time according to the number of slots and the second parameter K, and empty the buffer at the first time.

In an example, the first terminal device receives, at slot 1, an SCI sent by a second terminal device, where the SCI indicates that a HARQ process number is 0, and the SCI indicates that a slot number M is 8, and the first terminal device obtains, according to resource pool configuration information, a second parameter K that is 8, where the first terminal device will receive a 64 th slot after the SCI, that is, a slot 65, as a first time, and if the first terminal device does not receive, after slot 1 to before slot 65, data of the HARQ process sent by the second terminal device, the first terminal device clears, at slot 65, a buffer corresponding to the HARQ process.

In yet another example, the first terminal device receives the SCI transmitted by the second terminal device at slot 1, the SCI indicates that the HARQ process number is 0, and the SCI indicates that the slot number M is 8, the priority is 2, a parameter K is included in the resource pool configuration information, wherein the parameter K is related to the priority and the CBR, the CBR of the current resource pool measured by the first terminal equipment is 0.6, the first terminal device may determine a parameter K, e.g., K4, based on the CBR and the priority 2, the first terminal device will receive the 32 th slot after the SCI, i.e. slot 33, as the first time, if the first terminal equipment does not receive the data with HARQ process number 0 sent by the second terminal equipment after slot 1 and before slot 33, the first terminal device clears the buffer corresponding to the HARQ process number 0 in the timeslot 33.

Further, the number of time slots or the number of time slot intervals is determined according to at least one of the following information:

i) the time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

in one example, the slot interval indication information indicated in the sidelink control information is, for example, a time interval of two adjacent transmission resources indicated in the sidelink control information (i.e., SCI).

ii) a maximum value among a plurality of slot interval indication information indicated in the sidelink control information received by the first terminal device;

in one example, if the sidelink control information (i.e. SCI) indicates a plurality of transmission resources, for example, 4, the time interval between two adjacent transmission resources may be indicated, for example, the time interval between two adjacent transmission resources is 4,6,8 time slots, respectively, and the maximum value 8 of the time interval may be taken as the number of time slots or the number of time slot intervals.

iii) a maximum value of a slot interval that the sidelink control information can indicate;

in one example, if the sidelink control information (i.e. SCI) includes an information field for indicating a time interval, for example, 4 bits, the range of the time interval that can be indicated is 0-15, the maximum value of the time interval is 15, and the maximum value of the time interval 15 may be selected as the number of slots or the number of slot intervals.

iV) a time slot interval configured in the resource pool configuration information;

in one example, a parameter M, which is the number of slots or the number of slot intervals, may be included in the resource pool configuration information.

V) side row feedback channel period parameters.

In one example, the period P of the sidelink feedback channel is configured by pre-configuration information or network configuration information, that is, each P sidelink timeslots includes one timeslot for transmitting the sidelink feedback channel, and the parameter M may be determined according to the parameter P, for example, M ═ P.

In this embodiment of the present application, the length of the timeslot is determined according to a basic parameter set corresponding to the sideline data transmission, where the basic parameter set at least includes a subcarrier interval.

In this embodiment of the application, if the first terminal device receives second indication information after receiving the first indication information, where the second indication information is used to determine a second time for emptying the cache, the first terminal device empties the cache at the second time according to the second indication information.

For example: the first terminal device receives first indication information at time t1, wherein the first indication information is used for determining the first time for emptying the cache; then, second indication information is received at time t2, the second indication information is used for determining a second time for emptying the cache, and the time t2 is later than the time t 1; then, the first terminal device empties the buffer at a second time according to the second indication information. It should be noted that the first time is later than time t2, that is, the first terminal device has not emptied the buffer when receiving the second indication information.

Fig. 5 is a schematic structural component diagram of a device for clearing a cache according to an embodiment of the present application, and is applied to a first terminal device, where as shown in fig. 5, the device for clearing a cache includes:

a receiving unit 501, configured to receive first indication information, where the first indication information is used to determine a first time for emptying a cache;

In an optional implementation manner, the receiving unit 501 is configured to receive the first indication information sent by a network device.

In an optional embodiment, the first indication information is carried in RRC signaling or DCI.

In an optional implementation manner, the receiving unit 501 is configured to receive the first indication information sent by the second terminal device.

In an optional implementation manner, the second terminal device is a terminal device that transmits the sidestream data.

In an optional implementation manner, the second terminal device is a head terminal device of a communication group in which the first terminal device is located.

In an optional implementation manner, the first indication information is time slot indication information.

In an optional embodiment, the timeslot indication information includes an SFN and a timeslot number.

In an alternative embodiment, the apparatus further comprises:

a processing unit 502, configured to determine a first time slot according to the SFN and the time slot number, and empty a buffer at a time corresponding to the first time slot.

In an alternative embodiment, the slot indication information includes a DFN and a slot number.

In an alternative embodiment, the apparatus further comprises:

a processing unit 502, configured to determine a second time slot according to the DFN and the time slot number, and empty the buffer at a time corresponding to the second time slot.

In an optional implementation, the first indication information is slot offset indication information.

In an alternative embodiment, the apparatus further comprises:

a processing unit 502, configured to determine the first time according to the timeslot offset indication information and a reference time, and empty a buffer at the first time.

In an alternative embodiment, the length of the timeslot is determined according to a basic parameter set corresponding to the sideline data transmission.

In an optional embodiment, the base parameter set comprises at least a subcarrier spacing.

In an alternative embodiment, the reference time is one of:

the time corresponding to the time slot number 0.

In an optional implementation manner, the first indication information is a first parameter M, where M is a positive integer.

In an alternative embodiment, the apparatus further comprises:

an acquisition unit (not shown in the figure) for acquiring the second parameter K; wherein K is a positive integer;

a processing unit 502, configured to determine the first time according to the first parameter M and the second parameter K, and empty the cache at the first time.

In an optional embodiment, the processing unit 502 is configured to use, as the first time, a K × M +1 th time slot or a K × M +1) -1 th time slot or a K × M time slot after the time when the first indication information is received; and emptying the cache at the first time.

In an optional implementation manner, the obtaining unit is configured to: acquiring the second parameter K according to resource pool configuration information, or acquiring the second parameter K according to network configuration information, or acquiring the second parameter K according to priority information, or acquiring the second parameter K according to time delay information, or acquiring the second parameter K according to CBR, or acquiring the second parameter K according to a periodic parameter of a sideline feedback channel.

In an alternative embodiment, the first parameter M is a slot interval number.

In an alternative embodiment, the slot interval data is determined according to at least one of the following information:

the time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value in the multiple time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value of the time slot interval that the sideline control information can indicate;

the time slot interval configured in the resource pool configuration information;

and (4) performing side feedback on the periodic parameters of the channel.

In an optional embodiment, the length of the timeslot is determined according to a basic parameter set corresponding to the sidelink data transmission, where the basic parameter set at least includes a subcarrier spacing.

In an optional embodiment, the receiving unit 501 is further configured to receive second indication information after the first indication information, where the second indication information is used to determine a second time for emptying the buffer;

the device further comprises: the processing unit 502 is configured to empty the cache at the second time according to the second indication information.

It should be understood by those skilled in the art that the related description of the above apparatus for clearing cache in the embodiments of the present application can be understood by referring to the related description of the method for clearing cache in the embodiments of the present application.

Fig. 6 is a schematic flowchart of a cache processing method provided in an embodiment of the present application, and as shown in fig. 6, the cache processing method includes the following steps:

step 601: the method comprises the steps that first side line data are received by first terminal equipment, the first terminal equipment determines to empty or use a cache according to a first criterion, and the first side line data are transmitted or retransmitted for the first time of a transmission block.

In this embodiment of the application, the first terminal device determines to empty or use the cache according to the first criterion, and may adopt any one of the following implementation manners:

1) and the first terminal equipment empties the data stored in the cache.

2) And the first terminal equipment stores the first side row data into a cache.

3) And the first terminal equipment replaces the data stored in the cache by the first side row data.

In one embodiment, if the priority of the first side row data is higher than the priority of the data stored in the cache, the first terminal device replaces the data stored in the cache with the first side row data. In another embodiment, if a plurality of data are stored in the buffer and more than one data have a priority lower than the priority of the first sidestream data, the first terminal replaces the data stored in the buffer with the first sidestream data having the lowest priority.

It should be understood that, in the above-described embodiment of deciding to replace the data stored in the cache with the first side row data based on the priority, the first criterion may not be limited. For example, when the first terminal device receives the first side line data and needs to store the first side line data in the cache, but there is no space in the cache to store the first side line data, the first terminal device determines whether to replace the data stored in the cache according to a comparison result between the priority of the first side line data and the priority of the data stored in the cache. And if the priority of the first side row data is higher than that of the data stored in the cache, the first terminal equipment replaces the data stored in the cache with the first side row data.

In an optional embodiment of the present application, the first criterion includes at least one of:

A) the number of time units for storing data in the cache exceeds a first threshold;

B) and the sum of the time unit number of the data storage in the cache and the transmission times of the transmission blocks corresponding to the first side row data received by the first terminal equipment exceeds a second threshold.

In the foregoing scheme, optionally, the second threshold is a maximum transmission number of a transport block. For example: and if the sum of the time unit number of the second side line data stored in the buffer and the received number of the data exceeds the maximum transmission times corresponding to the data, the data is considered not to be retransmitted later, and the buffer can be emptied.

In the foregoing scheme, optionally, the second threshold is a maximum transmission number of a transport block. For example: and if the number of the second side line data stored in the buffer memory exceeds the maximum transmission times corresponding to the data in unit of time, the buffer memory can be emptied after the data is considered to have no retransmission.

In the foregoing scheme, optionally, the first threshold is the number of time units corresponding to the time delay of the data stored in the buffer. For example: and if the maximum time delay corresponding to the data is 100ms and each timing unit is 1ms, emptying the buffer or replacing the data in the buffer with the first side line data when the timing exceeds the maximum time delay of 100 ms.

It should be understood that in the above solution, the first terminal device restarts the timer when storing the data in the buffer. For example, the first terminal device receives the second side data and stores the second side data in the buffer, at this time, a timer is started, and when the first terminal device receives the retransmission of the second side data, the retransmission data is stored in the buffer, and at this time, the timer is restarted.

In the foregoing scheme, optionally, the first terminal device obtains a first parameter M and a second parameter K, and determines the first threshold according to M and K, where M, K is a positive integer.

Further, the first parameter M and the second parameter K may be determined by:

I) the determination method of the first parameter M:

the first parameter M is the time unit interval number; the time unit interval number is determined according to at least one of the following information:

time unit interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value in the plurality of time unit interval indication information indicated in the sideline control information received by the first terminal equipment;

a maximum value of a time unit interval that the side row control information can indicate;

time unit intervals configured in the resource pool configuration information;

and (4) performing side feedback on the periodic parameters of the channel.

II) determining the second parameter K:

the first terminal equipment acquires a second parameter K in the following mode:

the first terminal device obtains the second parameter K according to the CBR, or,

It should be noted that the time unit in the above-mentioned scheme of the present application may be a time slot, a subframe, or a fixed time interval, or an absolute time, etc.

In an embodiment, the first terminal device receives first side row data and needs to store the first side row data in a buffer, and the first terminal device may determine whether storage time of the data stored in the buffer exceeds a first threshold (or exceeds a second threshold), and if the storage time of the data stored in the buffer exceeds the second threshold, the first terminal device replaces the data stored in the buffer with the first side row data. If more than one data is stored in the buffer for more than a first time period (or more than a second time period) exceeding a first threshold, the first terminal device may replace the data with the first sidelink data for the most time period exceeding the first threshold (or the second threshold). Alternatively, the first terminal device may replace, with the first sidestream data, data having a lowest priority among the plurality of data exceeding the first threshold (or the second threshold).

In the above embodiment, when K is 1, that is, the first threshold is determined only according to the first parameter M.

Fig. 7 is a schematic structural composition diagram of a processing apparatus for caching provided in an embodiment of the present application, and is applied to a first terminal device, where as shown in fig. 7, the processing apparatus for caching includes:

a receiving unit 701 for receiving first side row data;

a processing unit 702, configured to determine to empty or use the buffer according to a first criterion, where the first side data is a first transmission or retransmission of a transport block.

In an optional implementation, the processing unit 702 is configured to:

the data stored in the cache is emptied, or,

storing the first side row data into a buffer, or,

and replacing the data stored in the cache by the first sideline data.

In an alternative embodiment, the first criteria includes at least one of:

the number of time units for storing data in the cache exceeds a first threshold;

the sum of the time unit number of the data storage in the cache and the transmission times of the transmission blocks corresponding to the first side row data received by the receiving unit exceeds a second threshold.

In an alternative embodiment, the second threshold is a maximum number of transmissions of one transport block.

In an optional implementation manner, the first threshold is a number of time units corresponding to a time delay of the data stored in the buffer.

In an alternative embodiment, the apparatus further comprises:

an obtaining unit (not shown in the figure) is configured to obtain a first parameter M and a second parameter K, and determine the first threshold according to M and K, where M, K is a positive integer.

In an alternative embodiment, the first parameter M is a time unit interval number; the time unit interval number is determined according to at least one of the following information:

time unit intervals configured in the resource pool configuration information;

and (4) performing side feedback on the periodic parameters of the channel.

In an optional implementation manner, the obtaining unit is configured to:

acquiring the second parameter K according to the resource pool configuration information, or,

obtaining the second parameter K according to the network configuration information, or,

acquiring the second parameter K according to the priority information, or,

and obtaining the second parameter K according to the time delay information, or,

obtaining the second parameter K according to the CBR, or,

and acquiring the second parameter K according to the periodic parameter of the side-row feedback channel.

It should be understood by those skilled in the art that the description of the foregoing cache processing apparatus according to the embodiment of the present application may be understood by referring to the description of the cache processing method according to the embodiment of the present application.

Fig. 8 is a schematic structural diagram of a communication device 800 according to an embodiment of the present application. The communication device may be a terminal device or a network device, and the communication device 800 shown in fig. 8 includes a processor 810, and the processor 810 may call and execute a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 8, the communication device 800 may also include a memory 820. From the memory 820, the processor 810 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 820 may be a separate device from the processor 810 or may be integrated into the processor 810.

Optionally, as shown in fig. 8, the communication device 800 may further include a transceiver 830, and the processor 810 may control the transceiver 830 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 830 may include a transmitter and a receiver, among others. The transceiver 830 may further include one or more antennas.

Optionally, the communication device 800 may specifically be a network device in the embodiment of the present application, and the communication device 800 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 800 may specifically be a mobile terminal/terminal device according to this embodiment, and the communication device 800 may implement a corresponding process implemented by the mobile terminal/terminal device in each method according to this embodiment, which is not described herein again for brevity.

Fig. 9 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 900 shown in fig. 9 includes a processor 910, and the processor 910 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 9, the chip 900 may further include a memory 920. From the memory 920, the processor 910 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 920 may be a separate device from the processor 910, or may be integrated in the processor 910.

Optionally, the chip 900 may further comprise an input interface 930. The processor 910 may control the input interface 930 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

Optionally, the chip 900 may further include an output interface 940. The processor 910 may control the output interface 940 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, and for brevity, no further description is given here.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

Fig. 10 is a schematic block diagram of a communication system 1000 provided in an embodiment of the present application. As shown in fig. 10, the communication system 1000 includes a terminal device 1010 and a network device 1020.

The terminal device 1010 may be configured to implement the corresponding function implemented by the terminal device in the foregoing method, and the network device 1020 may be configured to implement the corresponding function implemented by the network device in the foregoing method, for brevity, no further description is provided here.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. 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 PROM (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 (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (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.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), Synchronous Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the mobile terminal/terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

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

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

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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

Claims

A method of flushing a cache, the method comprising:

the method comprises the steps that first terminal equipment receives first indication information, wherein the first indication information is used for determining a first moment when a cache is emptied;

the cache is used for storing the side line data received by the first terminal device.
The method of claim 1, wherein the first terminal device receiving first indication information comprises:

and the first terminal equipment receives the first indication information sent by the network equipment.
The method of claim 2, wherein the first indication information is carried in Radio Resource Control (RRC) signaling or Downlink Control Information (DCI).
The method of claim 1, wherein the first terminal device receiving first indication information comprises:

and the first terminal equipment receives the first indication information sent by the second terminal equipment.
The method of claim 4, wherein the second terminal device is a terminal device that transmits the sidestream data.
The method of claim 4, wherein the second terminal device is a head-of-group terminal device of a communication group in which the first terminal device is located.
The method according to any of claims 4 to 6, wherein the first indication information is carried in sidelink control information, SCI, or sidelink RRC, signaling.
The method according to any one of claims 1 to 7, wherein the first indication information is slot indication information.
The method of claim 8, wherein the slot indication information comprises a System Frame Number (SFN) and a slot number.
The method of claim 9, wherein the method further comprises:

and the first terminal equipment determines a first time slot according to the SFN and the time slot number, and empties the cache at the moment corresponding to the first time slot.
The method of claim 8, wherein the slot indication information comprises a Direct Frame Number (DFN) and a slot number.
The method of claim 11, wherein the method further comprises:

and the first terminal equipment determines a second time slot according to the DFN and the time slot number, and empties the cache at the time corresponding to the second time slot.
The method according to any one of claims 1 to 7, wherein the first indication information is slot offset indication information.
The method of claim 13, wherein the method further comprises:

and the first terminal equipment determines the first moment according to the time slot offset indication information and the reference moment, and empties the cache at the first moment.
The method of claim 14, wherein the slot offset indication information is used to indicate N slots, N being a positive integer; the reference time and the first time are separated by the N time slots.
The method of claim 15, wherein the length of the time slot is determined according to a base parameter set corresponding to the sideline data transmission.
The method of claim 16, wherein the base parameter set comprises at least a subcarrier spacing.
The method according to any of claims 14 to 17, wherein the reference time instant is one of:

the time when the first terminal equipment receives the signaling carrying the time slot offset indication information;

the time corresponding to the frame number 0 and the time slot number 0 in one SFN period;

the time corresponding to the frame number 0 and the time slot number 0 in one DFN period;

the time corresponding to the time slot number 0.
The method according to any one of claims 1 to 7, wherein the first indication information is a first parameter M, wherein M is a positive integer.
The method of claim 19, wherein the method further comprises:

the first terminal equipment acquires a second parameter K; wherein K is a positive integer;

and the first terminal equipment determines the first moment according to the first parameter M and the second parameter K, and empties the cache at the first moment.
The method of claim 20, wherein the first terminal device determines the first time according to the first parameter M and the second parameter K, and empties a buffer at the first time, and the method includes:

the first terminal device takes the K × M +1 time slot after the time when the first indication information is received as the first time;

and the first terminal equipment empties the cache at the first moment.
The method according to claim 20 or 21, wherein the first terminal device obtaining a second parameter K comprises:

the first terminal device obtains the second parameter K according to the resource pool configuration information, or,

the first terminal device obtains the second parameter K according to the network configuration information, or,

the first terminal device obtains the second parameter K according to the priority information, or,

the first terminal device obtains the second parameter K according to the time delay information, or,

the first terminal device obtains the second parameter K according to the channel busy ratio CBR, or,

and the first terminal equipment acquires the second parameter K according to the periodic parameter of the sidestream feedback channel.
The method of any one of claims 19 to 22, wherein the first parameter M is a slot interval number.
The method of claim 23, wherein the slot interval number is determined according to at least one of:

the time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value in the multiple time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value of the time slot interval that the sideline control information can indicate;

the slot interval configured in the resource pool configuration information,

and (4) performing side feedback on the periodic parameters of the channel.
The method of claim 23 or 24, wherein the length of the time slot is determined according to a basic parameter set corresponding to the sidelink data transmission, wherein the basic parameter set comprises at least a subcarrier spacing.
The method of any one of claims 1 to 25, wherein the method comprises:

after receiving the first indication information, the first terminal device receives second indication information, wherein the second indication information is used for determining a second moment for emptying the cache;

and the first terminal equipment empties the cache at the second moment according to the second indication information.
A method of processing a cache, the method comprising:

the method comprises the steps that first side line data are received by first terminal equipment, the first terminal equipment determines to empty or use a cache according to a first criterion, and the first side line data are transmitted or retransmitted for the first time by a transmission block TB.
The method of claim 27, wherein the first terminal device determining to empty or use a cache according to a first criterion comprises:

the first terminal device empties the data stored in the buffer, or,

the first terminal device stores the first side row data in a cache, or,

and the first terminal equipment replaces the data stored in the cache by the first side row data.
The method of claim 27 or 28, wherein the first criterion comprises at least one of:

the number of time units for storing data in the cache exceeds a first threshold;

and the sum of the time unit number of the data storage in the cache and the transmission times of the transmission blocks corresponding to the first side row data received by the first terminal equipment exceeds a second threshold.
The method of claim 29, wherein the second threshold is a maximum number of transmissions of one transport block.
The method of claim 29, wherein the first threshold is a number of time units corresponding to a latency of data stored in the buffer.
The method of claim 29, wherein the method further comprises,

the first terminal device obtains a first parameter M and a second parameter K, and determines the first threshold according to M and K, wherein M, K is a positive integer.
The method of claim 32, wherein the first parameter M is a time unit interval number; the time unit interval number is determined according to at least one of the following information:

time unit interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value in the plurality of time unit interval indication information indicated in the sideline control information received by the first terminal equipment;

a maximum value of a time unit interval that the side row control information can indicate;

time unit intervals configured in the resource pool configuration information;

and (4) performing side feedback on the periodic parameters of the channel.
The method according to claim 32 or 33, wherein the first terminal device obtaining a second parameter K comprises:

the first terminal device obtains the second parameter K according to the resource pool configuration information, or,

the first terminal device obtains the second parameter K according to the network configuration information, or,

the first terminal device obtains the second parameter K according to the priority information, or,

the first terminal device obtains the second parameter K according to the time delay information, or,

the first terminal device obtains the second parameter K according to the channel busy ratio CBR, or,

and the first terminal equipment acquires the second parameter K according to the periodic parameter of the sidestream feedback channel.
An apparatus for clearing a cache, applied to a first terminal device, the apparatus comprising:

the receiving unit is used for receiving first indication information, and the first indication information is used for determining a first moment for emptying the cache;

the cache is used for storing the side line data received by the first terminal device.
The apparatus of claim 35, wherein the receiving unit is configured to receive the first indication information sent by a network device.
The apparatus of claim 36, wherein the first indication information is carried in RRC signaling or DCI.
The apparatus of claim 35, wherein the receiving unit is configured to receive the first indication information sent by a second terminal device.
The apparatus of claim 38, wherein the second terminal device is a terminal device that transmits the sidestream data.
The apparatus of claim 38, wherein the second terminal device is a head of group terminal device of a communication group in which the first terminal device is located.
The apparatus of any of claims 38-40, wherein the first indication information is carried in SCI or sidestream RRC signaling.
The apparatus according to any of claims 35 to 41, wherein the first indication information is slot indication information.
The apparatus of claim 42, wherein the slot indication information comprises an SFN and a slot number.
The apparatus of claim 43, wherein the apparatus further comprises:

and the processing unit is used for determining a first time slot according to the SFN and the time slot number and emptying the cache at the moment corresponding to the first time slot.
The apparatus of claim 42, wherein the slot indication information comprises a DFN and a slot number.
The apparatus of claim 45, wherein the apparatus further comprises:

and the processing unit is used for determining a second time slot according to the DFN and the time slot number and emptying the cache at the time corresponding to the second time slot.
The apparatus according to any of claims 35 to 41, wherein the first indication information is slot offset indication information.
The apparatus of claim 47, wherein the apparatus further comprises:

and the processing unit is used for determining the first time according to the time slot offset indication information and the reference time and emptying the cache at the first time.
The apparatus of claim 48, wherein the slot offset indication information indicates N slots, N being a positive integer; the reference time and the first time are separated by the N time slots.
The apparatus of claim 49, wherein a length of the time slot is determined according to a base parameter set corresponding to the sideline data transmission.
The apparatus of claim 50, wherein the base parameter set comprises at least a subcarrier spacing.
The apparatus of any one of claims 48 to 51, wherein the reference time instant is one of:

the time when the first terminal equipment receives the signaling carrying the time slot offset indication information;

the time corresponding to the frame number 0 and the time slot number 0 in one SFN period;

the time corresponding to the frame number 0 and the time slot number 0 in one DFN period;

the time corresponding to the time slot number 0.
The apparatus according to any one of claims 35 to 41, wherein the first indication information is a first parameter M, where M is a positive integer.
The apparatus of claim 53, wherein the apparatus further comprises:

an acquisition unit configured to acquire a second parameter K; wherein K is a positive integer;

and the processing unit is used for determining the first moment according to the first parameter M and the second parameter K and emptying the cache at the first moment.
The apparatus according to claim 54, wherein the processing unit is configured to take a K x (M +1) th time slot after the time when the first indication information is received as the first time; and emptying the cache at the first time.
The apparatus of claim 54 or 55, wherein the obtaining unit is configured to: acquiring the second parameter K according to resource pool configuration information, or acquiring the second parameter K according to network configuration information, or acquiring the second parameter K according to priority information, or acquiring the second parameter K according to time delay information, or acquiring the second parameter K according to CBR, or acquiring the second parameter K according to a periodic parameter of a sideline feedback channel.
The apparatus of any one of claims 53 to 56, wherein the first parameter M is a slot interval number.
The apparatus of claim 57, wherein the number of slot intervals is determined based on at least one of:

the time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value in the multiple time slot interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value of the time slot interval that the sideline control information can indicate;

the time slot interval configured in the resource pool configuration information;

and (4) performing side feedback on the periodic parameters of the channel.
The apparatus of claim 57 or 58, wherein the length of the time slot is determined according to a base set of parameters corresponding to the sidelink data transmission, wherein the base set of parameters includes at least a subcarrier spacing.
The apparatus according to any one of claims 35 to 59, wherein the receiving unit is further configured to receive second indication information after the first indication information, where the second indication information is used to determine a second time for emptying the buffer;

the device further comprises: and the processing unit is used for emptying the cache at the second moment according to the second indication information.
A processing device of cache is applied to a first terminal device, and the device comprises:

a receiving unit for receiving first side row data;

and the processing unit is used for determining to empty or use the cache according to a first criterion, wherein the first side row data is the first transmission or retransmission of one transmission block.
The apparatus of claim 61, wherein the processing unit is configured to:

the data stored in the cache is emptied, or,

storing the first side row data into a buffer, or,

and replacing the data stored in the cache by the first sideline data.
The apparatus of claim 61 or 62, wherein the first criterion comprises at least one of:

the number of time units for storing data in the cache exceeds a first threshold;

the sum of the time unit number of the data storage in the cache and the transmission times of the transmission blocks corresponding to the first side row data received by the receiving unit exceeds a second threshold.
The apparatus of claim 63, wherein the second threshold is a maximum number of transmissions of one transport block.
The apparatus of claim 63, wherein the first threshold is a number of time units corresponding to a latency of data stored in the buffer.
The apparatus of claim 63, wherein the apparatus further comprises:

an obtaining unit, configured to obtain a first parameter M and a second parameter K, and determine the first threshold according to M and K, where M, K is a positive integer.
The apparatus of claim 66, wherein the first parameter M is a time unit interval number; the time unit interval number is determined according to at least one of the following information:

time unit interval indication information indicated in the sideline control information received by the first terminal equipment;

the maximum value in the plurality of time unit interval indication information indicated in the sideline control information received by the first terminal equipment;

a maximum value of a time unit interval that the side row control information can indicate;

time unit intervals configured in the resource pool configuration information;

and (4) performing side feedback on the periodic parameters of the channel.
The apparatus of claim 66 or 67, wherein the obtaining unit is to:

acquiring the second parameter K according to the resource pool configuration information, or,

obtaining the second parameter K according to the network configuration information, or,

acquiring the second parameter K according to the priority information, or,

and obtaining the second parameter K according to the time delay information, or,

obtaining the second parameter K according to the CBR, or,

and acquiring the second parameter K according to the periodic parameter of the side-row feedback channel.
A terminal device, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory, to perform the method of any of claims 1 to 26, or to perform the method of any of claims 27 to 34.
A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any of claims 1 to 26, or the method of any of claims 27 to 34.
A computer readable storage medium storing a computer program for causing a computer to perform the method of any of claims 1 to 26 or the method of any of claims 27 to 34.
A computer program product comprising computer program instructions to cause a computer to perform the method of any of claims 1 to 26, or the method of any of claims 27 to 34.
A computer program for causing a computer to perform the method of any one of claims 1 to 26, or the method of any one of claims 27 to 34.