CN111757294A - Scheduling method and device of retransmission resources - Google Patents

Scheduling method and device of retransmission resources Download PDF

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Publication number
CN111757294A
CN111757294A CN201910259339.6A CN201910259339A CN111757294A CN 111757294 A CN111757294 A CN 111757294A CN 201910259339 A CN201910259339 A CN 201910259339A CN 111757294 A CN111757294 A CN 111757294A
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terminal
time
retransmission
scheduling request
data
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张锦芳
苏宏家
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201910259339.6A priority Critical patent/CN111757294A/en
Priority to PCT/CN2020/080675 priority patent/WO2020199957A1/en
Publication of CN111757294A publication Critical patent/CN111757294A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

The embodiment of the application provides a scheduling method and equipment of retransmission resources, which can be applied to scenes such as unmanned driving, automatic driving, internet driving and the like in the internet of vehicles such as V2X, V2V, V2P, V2I, V2N and the like, and can also be applied to D2D, so that the problems that transmission delay time in retransmission is long, and due to the fact that proper time-frequency resource size cannot be allocated for retransmission data, a transmitting end cannot transmit complete retransmission data, a receiving end cannot perform merging decoding, and decoding failure occurs are solved. The scheme is as follows: the first terminal sends data to the second terminal on SL; receiving a HARQ-ACK feedback message from the second terminal for indicating whether the second terminal successfully receives the data; determining that the data needs to be retransmitted according to the HARQ-ACK feedback message; and in the next sending opportunity of the time unit receiving the HARQ-ACK feedback message in the SR retransmission cycle, sending a retransmission scheduling request to the network equipment through the configured time-frequency resource, wherein the retransmission scheduling request is used for requesting to schedule the time-frequency resource of the retransmission data.

Description

Scheduling method and device of retransmission resources
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for scheduling retransmission resources.
Background
In the technology of vehicle to other device communication (V2X) based on a cellular network (e.g., 3G, 4G Long Term Evolution (LTE), or 5G NR, etc.), a Side Link (SL) is a link defined for direct communication between a terminal and a terminal, that is, the terminal and the terminal communicate directly without forwarding through a network device, such as a base station. Currently, in mode (mode)1 of SL communication, a terminal may transmit control information and data of SL communication on scheduled time-frequency resources according to scheduling of a network device. In addition, V2X based on 5G NR introduces unicast and multicast transmission in SL communication. In unicast/multicast transmission, in order to improve transmission reliability and reduce transmission delay, a hybrid automatic repeat request (HARQ) technique may be used. In the HARQ technology, a receiving end may feed back an HARQ-Acknowledgement (ACK) feedback message to a transmitting end to indicate whether data transmitted by the transmitting end is received successfully. The sending end can determine whether data retransmission is needed according to the HARQ-ACK feedback message.
Under the condition that the sending end performs SL communication by using the mode1, if the sending end determines to perform data retransmission according to the HARQ-ACK feedback message fed back by the receiving end, the sending end may request a network device (e.g., a base station) to schedule time-frequency resources for data transmission by sending a Scheduling Request (SR) and a Buffer Status Report (BSR). For example, referring to fig. 1, different SR periods are currently configured for different terminals or different logical channels of the same terminal. If the sending end sends new data (ND, or called initial transmission data) to the receiving end through SL and receives HARQ-ACK feedback message fed back by the receiving end, such as Negative Acknowledgement (NACK), the sending end may determine that data retransmission is needed. At this time, the transmitting end may first transmit an SR to the base station at the latest SR timing (interference). After receiving the SR, the base station may issue a Scheduling Grant (SG) to allocate time-frequency resources to the transmitting end. The sending end sends a BSR to the base station by using the time-frequency resource, and the BSR indicates the size of data to be sent (namely, data to be retransmitted). And the base station further sends SG according to the indication of the BSR so as to allocate time-frequency resources for data transmission for the sending end. The transmitting end can use the time frequency resource to complete the transmission of Retransmission Data (RD).
As can be understood from fig. 1 and the above description, when a transmitting end needs to perform data retransmission, if a base station is requested to schedule time-frequency resources for data transmission by sending an SR and a BSR, at least two Round Trip Times (RTTs) must be waited, which results in a transmission delay time during retransmission. In addition, in the current mechanism, the base station cannot distinguish whether the data requested to be scheduled is the initial transmission data or the retransmission data, and if the data requested to be scheduled is the retransmission data, the base station cannot allocate a proper time-frequency resource size to the data, so that the transmitting end cannot transmit the complete retransmission data, the receiving end cannot perform merging decoding, and decoding failure occurs.
Disclosure of Invention
The embodiment of the application provides a scheduling method and equipment of retransmission resources, which can be applied to scenes such as unmanned driving, automatic driving, internet driving and the like in the internet of vehicles such as V2X, V2V, V2P, V2I, V2N and the like, and can also be applied to equipment-to-equipment (D2D), so that the problems that transmission delay time during retransmission is long, and a transmitting end cannot transmit complete retransmission data, a receiving end cannot perform merging decoding and decoding failure occurs due to the fact that proper time-frequency resource size cannot be allocated for the retransmission data are solved.
In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:
in a first aspect, an embodiment of the present application provides a method for scheduling retransmission resources, where the method may include: the first terminal sends data to the second terminal on SL, and the second terminal can feed back HARQ-ACK feedback information to the first terminal according to whether the second terminal decodes the received data successfully. The first terminal receives a HARQ-ACK feedback message from the second terminal, the HARQ-ACK feedback message indicating whether the second terminal successfully received the data. The first terminal can determine whether the data needs to be retransmitted according to the received HARQ-ACK feedback message; if the data needs to be retransmitted, the first terminal may send a retransmission scheduling request to the network device through the configured time-frequency resource in a retransmission SR period and at a next sending opportunity of a first time unit, where the retransmission scheduling request is used to request scheduling of the time-frequency resource of the retransmitted data, and the first time unit is a time unit that receives the HARQ-ACK feedback message.
According to the scheduling method of the retransmission resources provided by the embodiment of the application, when the first terminal determines that the data retransmission on the SL is required, the network equipment requests the network equipment to schedule the time-frequency resources of the retransmission data on the SL at the sending time of the SR retransmission period by adopting the retransmission scheduling request newly introduced by the embodiment of the application, so that the network equipment can determine that the first terminal requests to schedule the retransmission data, the proper time-frequency resource size can be allocated for the retransmission data, and the problems that the second terminal cannot perform merging and decoding after receiving the retransmission data and the decoding fails are solved. In addition, the SR retransmission cycle can be designed according to the SL time unit, so that the first terminal can send the retransmission scheduling request to the network device in time, and the problem of transmission delay time during retransmission is solved.
In one possible implementation, the retransmission SR period may be the same as one time unit of the SL.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource configuration from network equipment, wherein the resource configuration can be used for configuring time-frequency resources for feeding back a retransmission scheduling request and initial sequence cyclic shift; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift and the pre-configured sequence cyclic shift. In this way, when the PUCCH feedback mode used by the retransmission scheduling request is format 0, different initial sequence cyclic shifts are configured for different terminals, so that multiplexing of multiple terminals on the same time-frequency resource is realized, and the utilization rate of network resources is improved.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource configuration from network equipment, wherein the resource configuration can be used for configuring time-frequency resources for feeding back a retransmission scheduling request, initial sequence cyclic shift and OCC; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the preconfigured SR bit information. Therefore, under the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 1, different initial sequence cyclic shifts and OCCs are configured for different terminals, multiplexing of the same time-frequency resource by a plurality of terminals is realized, and the utilization rate of network resources is improved.
In another possible implementation, the SR retransmission period is the same as N time units of SL, where N is an integer greater than 1.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource configuration from network equipment, wherein the resource configuration can be used for configuring time-frequency resources for feeding back a retransmission scheduling request and initial sequence cyclic shift; the first terminal obtains a sequence cyclic shift corresponding to the K according to a first time unit and a sending opportunity interval K and a first mapping relation, wherein the K is an integer which is greater than or equal to 1 and less than or equal to N, and the first mapping relation comprises: k, and a sequence cyclic shift corresponding to K; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the K. Therefore, under the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 0, different initial sequence cyclic shifts are configured for different terminals, multiplexing of multiple terminals on the same time-frequency resource is achieved, the utilization rate of network resources is improved, and the network equipment can determine which data is specifically retransmitted by the first terminal requesting scheduling through designing different sequence cyclic shifts.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back a retransmission scheduling request, initial sequence cyclic shift and OCC; the first terminal acquires SR bit information corresponding to K according to the interval K between the first time unit and the sending opportunity and a second mapping relation, wherein the second mapping relation comprises: k and SR bit information corresponding to K; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the K. Therefore, under the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 1, different initial sequence cyclic shifts and OCCs are configured for different terminals, multiplexing of multiple terminals on the same time-frequency resource is achieved, the utilization rate of network resources is improved, and different SR bit information is designed to enable the network equipment to determine which data is specifically retransmitted by the first terminal requesting scheduling.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for feeding back a retransmission scheduling request; a first terminal generates a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit for receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not. In this way, for the case that the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the network device can determine which specific retransmission data the first terminal requests to schedule is by designing the UCI format.
In another possible implementation, N is less than or equal to the number M of HARQ processes in SL, where M is a positive integer.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for feeding back a retransmission scheduling request and initial sequence cyclic shift; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and obtains the sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relation, wherein the third mapping relation comprises the following steps: HARQ process number and the sequence cyclic shift corresponding to the HARQ process number; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number. In this way, when the PUCCH feedback mode used by the retransmission scheduling request is format 0, different initial sequence cyclic shifts are configured for different terminals, so that multiplexing of multiple terminals on the same time-frequency resource is realized, and the utilization rate of network resources is improved. And, different sequence cyclic shifts are designed for different HARQ process numbers, so that the network device can determine which data the retransmission data requested to be scheduled by the first terminal is.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back a retransmission scheduling request, initial sequence cyclic shift and OCC; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relation, wherein the fourth mapping relation comprises: HARQ process number and SR bit information corresponding to the HARQ process number; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the HARQ process number. Therefore, under the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 1, different initial sequence cyclic shifts and OCCs are configured for different terminals, multiplexing of multiple terminals on the same time-frequency resource is achieved, the utilization rate of network resources is improved, and different SR bit information is designed for different HARQ process numbers, so that the network equipment can determine which data is specifically retransmitted by the first terminal requesting scheduling.
In another possible implementation manner, before the first terminal sends the retransmission scheduling request to the network device through the configured time-frequency resource at the next sending opportunity of the first time unit in the SR retransmission cycle, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for feeding back a retransmission scheduling request; a first terminal generates a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, each of the N bits being used to indicate whether data transmitted in each of the N HARQ processes requires retransmission scheduling. In this way, for the case that the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the network device can determine which specific retransmission data the first terminal requests to schedule is by designing the UCI format.
In another possible implementation manner, the resource configuration may also be used to configure an OCC for feeding back a retransmission scheduling request; after the first terminal generates the retransmission scheduling request, the method further includes: and the first terminal performs time domain spread spectrum processing on the retransmission scheduling request through the OCC. Therefore, under the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 4, different OCCs are configured for different terminals, multiplexing of the same time-frequency resource by a plurality of terminals is realized, and the utilization rate of network resources is improved.
In a second aspect, an embodiment of the present application provides a method for scheduling retransmission resources, where the method may include: the first terminal sends data to the second terminal on SL, and the second terminal can feed back HARQ-ACK feedback information to the first terminal according to whether the second terminal decodes the received data successfully. The first terminal receives a HARQ-ACK feedback message from the second terminal, the HARQ-ACK feedback message indicating whether the second terminal successfully received the data. The first terminal can determine whether the data needs to be retransmitted according to the received HARQ-ACK feedback message; if the data needs to be retransmitted and the first terminal is configured with the time-frequency resource of the first uplink control information, the first terminal sends second uplink control information through the configured time-frequency resource of the first uplink control information, wherein the second uplink control information comprises a retransmission scheduling request, or the second uplink control information comprises a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used for requesting to schedule the time-frequency resource of the retransmitted data.
According to the scheduling method of retransmission resources provided by the embodiment of the application, when the first terminal determines that data retransmission on the SL is required, if the time-frequency resources such as HARQ-ACK feedback messages or SR or CSI for Uu are configured right, by adopting the retransmission scheduling request newly introduced by the embodiment of the application, the time-frequency resources for retransmitting data on the SL are requested to be scheduled to the network equipment on the time-frequency resources, so that the network equipment can determine that the first terminal requests to schedule the retransmission data, the proper time-frequency resources can be allocated for the retransmission data, and the problem that the second terminal cannot do combined decoding after receiving the retransmission data and fails in decoding is solved. Meanwhile, the first terminal can also send the retransmission scheduling request to the network equipment in time, so that the problem of transmission delay time during retransmission is solved.
In a possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources of initial sequence cyclic shift and first uplink control information transmission; the first terminal obtains the sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and a first mapping relation, wherein the first mapping relation comprises the second uplink control information and the sequence cyclic shift corresponding to the second uplink control information; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information. Therefore, under the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 0, different initial sequence cyclic shifts are configured for different terminals, multiplexing of multiple terminals on the same time-frequency resource is achieved, the utilization rate of network resources is improved, and the network equipment can determine which data is specifically retransmitted by the first terminal requesting scheduling through designing different sequence cyclic shifts.
In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further includes: a first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring initial sequence cyclic shift, OCC and time-frequency resources for sending first uplink control information; the first terminal obtains SR bit information corresponding to the second uplink control information according to the second uplink control information and a second mapping relationship, where the second mapping relationship includes: second uplink control information, and SR bit information corresponding to the second uplink control information; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the second uplink control information. Aiming at the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 1, multiplexing of a plurality of terminals on the same time-frequency resource is realized by configuring different initial sequence cyclic shifts and OCCs for different terminals, the utilization rate of network resources is improved, and the network equipment can determine which data is specifically retransmitted by the first terminal requesting scheduling by designing different SR bit information.
In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for sending first uplink control information; a first terminal generates a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit for receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1. For the case that the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the network device can determine which specific retransmission data the first terminal requests to schedule by designing the UCI format.
In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources of initial sequence cyclic shift and first uplink control information transmission; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and obtains the sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relation, wherein the third mapping relation comprises the following steps: HARQ process number and the sequence cyclic shift corresponding to the HARQ process number; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number. Aiming at the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 0, different initial sequence cyclic shifts are configured for different terminals, so that multiplexing of the same time-frequency resource by a plurality of terminals is realized, and the utilization rate of the network resource is improved. And, different sequence cyclic shifts are designed for different HARQ process numbers, so that the network device can determine which data the retransmission data requested to be scheduled by the first terminal is.
In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating initial sequence cyclic shift, OCC and time-frequency resources for sending first uplink control information; the first terminal determines the HARQ process number according to the HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relation, wherein the fourth mapping relation comprises: HARQ process number and SR bit information corresponding to the HARQ process number; and the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the HARQ process number. Aiming at the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 1, multiplexing of a plurality of terminals on the same time-frequency resource is realized by configuring different initial sequence cyclic shifts and OCCs for different terminals, the utilization rate of network resources is improved, and different SR bit information is designed for different HARQ process numbers, so that the network equipment can determine which data is specifically retransmitted by the first terminal for scheduling request.
In another possible implementation manner, before the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, the method further includes: a first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for sending first uplink control information; a first terminal generates a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling, N is the number of time units included in the configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in SL. For the case that the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the network device can determine which specific retransmission data the first terminal requests to schedule by designing the UCI format.
In another possible implementation manner, the resource configuration is further configured to configure an OCC for feeding back the retransmission scheduling request; after the first terminal generates the retransmission scheduling request, the method further includes: and the first terminal performs time domain spread spectrum processing on the retransmission scheduling request through the OCC. Aiming at the condition that the PUCCH feedback mode used by the retransmission scheduling request is format 4, different OCCs are configured for different terminals, so that multiplexing of the same time-frequency resource by a plurality of terminals is realized, and the utilization rate of network resources is improved.
In a third aspect, an embodiment of the present application provides a method for scheduling retransmission resources, where the method may include: the network equipment receives a retransmission scheduling request sent by the first terminal through configured time-frequency resources at a sending opportunity in a retransmission SR period, wherein the retransmission scheduling request is used for requesting to schedule the time-frequency resources of retransmission data; and the network equipment schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
In one possible implementation manner, the SR retransmission period is the same as one time unit of the SL, which is a link for data transmission between the first terminal and the second terminal.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift according to the retransmission scheduling request, determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift, and determines data needing to be retransmitted; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, determines the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and determines the data needing to be retransmitted; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation, the SR retransmission period is the same as N time units of SL, where N is an integer greater than 1.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift; the network equipment determines sequence cyclic shift according to the retransmission scheduling request; the network device determines K corresponding to the sequence cyclic shift according to the sequence cyclic shift and a first mapping relation, wherein K is an interval between a first time unit and a sending opportunity, and the first mapping relation comprises: the method comprises the steps of sequence cyclic shift and K corresponding to the sequence cyclic shift, wherein a first time unit is the time unit when a first terminal receives a HARQ-ACK feedback message; the network equipment determines data needing to be retransmitted according to the K; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request; the network equipment determines SR bit information according to the retransmission scheduling request; the network device determines, according to the SR bit information and a second mapping relationship, K corresponding to the SR bit information, where K is an interval between the first time unit and the transmission opportunity, and the second mapping relationship includes: SR bit information and K corresponding to the SR bit information, wherein the first time unit is a time unit for the first terminal to receive the HARQ-ACK feedback message; the network equipment determines data needing to be retransmitted according to the K; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data transmitted in time units corresponding to the first N time units of the transmission opportunity, and the second information is used to indicate an interval between a time unit receiving a HARQ-ACK feedback message of the data to be retransmitted and the transmission opportunity; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determines data needing to be retransmitted according to the first information and the second information; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data transmitted on a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted and scheduled; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determines data needing to be retransmitted according to a bitmap; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation, N is less than or equal to the number M of HARQ processes in SL, where M is a positive integer.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift; the network equipment determines sequence cyclic shift according to the retransmission scheduling request; the network device determines an HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relationship, where the third mapping relationship includes: a sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift; the network equipment determines data to be retransmitted according to the HARQ process number; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request; the network equipment determines SR bit information according to the retransmission scheduling request; the network device determines, according to the SR bit information and a fourth mapping relationship, an HARQ process number corresponding to the SR bit information, where the fourth mapping relationship includes: SR bit information and a HARQ process number corresponding to the SR bit information; the network equipment determines data to be retransmitted according to the HARQ process number; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data sent in time units corresponding to the first N time units of the sending opportunity, and the second information is used to indicate the HARQ process number of the data to be retransmitted; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource bearing the retransmission scheduling request or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines data to be retransmitted according to the first information and the second information, and schedules the time-frequency resource of the retransmitted data for the first terminal, including: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines the terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, determines the data to be retransmitted according to the bitmap, and schedules the time-frequency resource of the retransmitted data for the first terminal, including: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In a fourth aspect, an embodiment of the present application provides a method for scheduling retransmission resources, where the method may include: the network equipment receives second uplink control information sent by the first terminal through configured time-frequency resources of the first uplink control information, wherein the second uplink control information comprises a retransmission scheduling request, or the second uplink control information comprises the retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used for requesting to schedule the time-frequency resources of retransmission data; and the network equipment schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
In a possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift according to the retransmission scheduling request, determines the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information and the initial sequence cyclic shift, and determines the data needing to be retransmitted; the network equipment schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method comprises the following steps: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, determines the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information and determines the data needing to be retransmitted; the network equipment schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method comprises the following steps: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data transmitted in time units corresponding to the first N time units of the transmission opportunity, and the second information is used to indicate an interval between a time unit receiving a HARQ-ACK feedback message of the data to be retransmitted and the transmission opportunity; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines data to be retransmitted according to the first information and the second information, and determines a terminal sending a retransmission scheduling request as a first terminal according to a time-frequency resource bearing the second uplink control information or according to the time-frequency resource bearing the second uplink control information and the OCC; the network equipment schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method comprises the following steps: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted on a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs retransmission scheduling; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines a terminal sending a retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information or the time-frequency resource bearing the second uplink control information and the OCC, and determines data needing retransmission according to a bitmap; the network equipment schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method comprises the following steps: scheduling time-frequency resources for the first terminal according to data needing to be retransmitted; wherein, N is the number of time units included in the configured SR retransmission cycle, and N is an integer greater than 1.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information and the initial sequence cyclic shift; the network equipment determines sequence cyclic shift according to the retransmission scheduling request; the network device determines an HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relationship, where the third mapping relationship includes: a sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift; the network equipment determines data to be retransmitted according to the HARQ process number; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, before the network device schedules, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal, the method further includes: the network equipment determines the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determines the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information; the network equipment determines SR bit information according to the retransmission scheduling request; the network device determines, according to the SR bit information and a fourth mapping relationship, an HARQ process number corresponding to the SR bit information, where the fourth mapping relationship includes: SR bit information and a HARQ process number corresponding to the SR bit information; the network equipment determines data to be retransmitted according to the HARQ process number; scheduling time-frequency resources for retransmission data for a first terminal, comprising: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data sent in time units corresponding to the first N time units of the sending opportunity, and the second information is used to indicate the HARQ process number of the data to be retransmitted; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines, according to the first information and the second information, data that needs to be retransmitted, and schedules, for the first terminal, the time-frequency resource for retransmitting the data, including: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling; before the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines, according to the bitmap, the data to be retransmitted, and schedules, for the first terminal, the time-frequency resource of the retransmission data, including: scheduling time-frequency resources for the first terminal according to data needing to be retransmitted; wherein, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in SL.
For the description of the beneficial effects corresponding to the third aspect and each implementation manner, reference may be made to the specific description of the corresponding contents in the first aspect and each implementation manner, and for the description of the beneficial effects corresponding to the fourth aspect and each implementation manner, reference may be made to the specific description of the corresponding contents in the second aspect and each implementation manner, which is not repeated here.
In a fifth aspect, an embodiment of the present application provides a communication apparatus, where the communication may include: the device comprises a control unit, a data sending unit and a data receiving unit.
The data sending unit is used for sending data to the second terminal on SL. And a data receiving unit, configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives the data. And the control unit is used for determining that the data needs to be retransmitted according to the received HARQ-ACK feedback message. And the data sending unit is further configured to send a retransmission scheduling request to the network device through the configured time-frequency resource at a next sending opportunity of a first time unit in the SR retransmission cycle, where the retransmission scheduling request is used to request scheduling of the time-frequency resource of the retransmission data, and the first time unit is a time unit that receives the HARQ-ACK feedback message.
In one possible implementation, the retransmission SR period may be the same as one time unit of the SL.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource and an initial sequence cyclic shift for feeding back a retransmission scheduling request; the communication apparatus may further include: and the data processing unit is used for generating a retransmission scheduling request according to the initial sequence cyclic shift and the pre-configured sequence cyclic shift.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request, the initial sequence cyclic shift, and the OCC; the communication apparatus may further include: and the data processing unit is used for generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the preconfigured SR bit information.
In another possible implementation, the SR retransmission period is the same as N time units of SL, where N is an integer greater than 1.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource and an initial sequence cyclic shift for feeding back a retransmission scheduling request; the communication apparatus may further include: a data processing unit, configured to obtain, according to an interval K between a first time unit and a sending opportunity and a first mapping relationship, a sequence cyclic shift corresponding to K, where K is an integer greater than or equal to 1 and less than or equal to N, and the first mapping relationship includes: and K and the sequence cyclic shift corresponding to K, and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to K.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request, the initial sequence cyclic shift, and the OCC; the communication apparatus may further include: a data processing unit, configured to obtain, according to a second mapping relationship and an interval K between the first time unit and the sending opportunity, SR bit information corresponding to K, where the second mapping relationship includes: k and SR bit information corresponding to K; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the K.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request; the communication apparatus may further include: the data processing unit is used for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit for receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not.
In another possible implementation, N is less than or equal to the number M of HARQ processes in SL, where M is a positive integer.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource and an initial sequence cyclic shift for feeding back a retransmission scheduling request; the communication apparatus may further include: a data processing unit, configured to determine a HARQ process number according to the HARQ-ACK feedback message, and obtain a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, where the third mapping relationship includes: HARQ process number and the sequence cyclic shift corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request, the initial sequence cyclic shift, and the OCC; the communication apparatus may further include: a data processing unit, configured to determine a HARQ process number according to the HARQ-ACK feedback message, and obtain, according to the HARQ process number and a fourth mapping relationship, SR bit information corresponding to the HARQ process number, where the fourth mapping relationship includes: HARQ process number and SR bit information corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the HARQ process number.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for feeding back the retransmission scheduling request; the communication apparatus may further include: the data processing unit is used for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, each of the N bits being used to indicate whether data transmitted in each of the N HARQ processes requires retransmission scheduling.
In another possible implementation manner, the resource configuration is further configured to configure an OCC for feeding back the retransmission scheduling request; and the data processing unit is also used for performing time domain spread spectrum processing on the retransmission scheduling request through the OCC.
In a sixth aspect, an embodiment of the present application provides a communication apparatus, which may include: the device comprises a data sending unit, a data receiving unit and a control unit. A data transmitting unit for transmitting data to the second terminal on the SL; a data receiving unit, configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data; the control unit is used for determining that the data needs to be retransmitted according to the HARQ-ACK feedback message; and the data sending unit is further configured to send, if the communication device is configured with the time-frequency resource of the first uplink control information, second uplink control information through the configured time-frequency resource of the first uplink control information, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of the time-frequency resource of the retransmission data.
In a possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for initial sequence cyclic shift and sending the first uplink control information; the communication apparatus may further include: a data processing unit, configured to obtain a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and a first mapping relationship, where the first mapping relationship includes the second uplink control information and the sequence cyclic shift corresponding to the second uplink control information; and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information.
In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure an initial sequence cyclic shift, an OCC, and a time-frequency resource for sending the first uplink control information; the communication apparatus may further include: a data processing unit, configured to obtain, according to the second uplink control information and a second mapping relationship, SR bit information corresponding to the second uplink control information, where the second mapping relationship includes: second uplink control information, and SR bit information corresponding to the second uplink control information; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the second uplink control information.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for sending the first uplink control information; the communication apparatus may further include: the data processing unit is used for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit for receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1.
In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the initial sequence cyclic shift and the time-frequency resource for sending the first uplink control information; the communication apparatus may further include: a data processing unit, configured to determine a HARQ process number according to the HARQ-ACK feedback message, and obtain a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, where the third mapping relationship includes: HARQ process number and the sequence cyclic shift corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.
In another possible implementation manner, the data receiving unit is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure an initial sequence cyclic shift, an OCC, and a time-frequency resource for sending the first uplink control information; the communication apparatus may further include: a data processing unit, configured to determine a HARQ process number according to the HARQ-ACK feedback message, and obtain, according to the HARQ process number and a fourth mapping relationship, SR bit information corresponding to the HARQ process number, where the fourth mapping relationship includes: HARQ process number and SR bit information corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the HARQ process number.
In another possible implementation manner, the data receiving unit is further configured to receive resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for sending the first uplink control information; the communication apparatus may further include: the data processing unit is used for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling, N is the number of time units included in the configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in SL.
In another possible implementation manner, the resource configuration is further configured to configure an OCC for feeding back the retransmission scheduling request; and the data processing unit is also used for performing time domain spread spectrum processing on the retransmission scheduling request through the OCC.
In a seventh aspect, an embodiment of the present application provides a communication apparatus, which may include: a data receiving unit and a configuration unit. A data receiving unit, configured to receive a retransmission scheduling request sent by a first terminal through configured time-frequency resources at a sending opportunity in a retransmission SR period, where the retransmission scheduling request is used to request scheduling of the time-frequency resources of retransmission data; and the configuration unit is used for scheduling the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
In one possible implementation manner, the SR retransmission period is the same as one time unit of the SL, which is a link for data transmission between the first terminal and the second terminal.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift according to the retransmission scheduling request, determining a terminal which sends the retransmission scheduling request as a first terminal according to the time-frequency resource which bears the retransmission scheduling request and the initial sequence cyclic shift, and determining data which needs to be retransmitted; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, determining the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift and the OCC, and determining data needing to be retransmitted; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation, the SR retransmission period is the same as N time units of SL, where N is an integer greater than 1.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift according to the retransmission scheduling request and determining a terminal for sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift; determining sequence cyclic shift according to the retransmission scheduling request; determining K corresponding to the sequence cyclic shift according to the sequence cyclic shift and a first mapping relation, wherein the K is an interval between a first time unit and a sending opportunity, and the first mapping relation comprises: the method comprises the steps of sequence cyclic shift and K corresponding to the sequence cyclic shift, wherein a first time unit is the time unit when a first terminal receives a HARQ-ACK feedback message; determining data to be retransmitted according to K; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determining the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request; determining SR bit information according to the retransmission scheduling request; determining K corresponding to the SR bit information according to the SR bit information and a second mapping relation, wherein K is an interval between the first time unit and the sending opportunity, and the second mapping relation comprises: SR bit information and K corresponding to the SR bit information, wherein the first time unit is a time unit for the first terminal to receive the HARQ-ACK feedback message; determining data to be retransmitted according to K; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data transmitted in time units corresponding to the first N time units of the transmission opportunity, and the second information is used to indicate an interval between a time unit receiving a HARQ-ACK feedback message of the data to be retransmitted and the transmission opportunity; the communication apparatus may further include: the data processing unit is used for determining a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determining data needing to be retransmitted according to the first information and the second information; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data transmitted on a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted and scheduled; the communication apparatus may further include: the data processing unit is used for determining a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determining data needing to be retransmitted according to a bitmap; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation, N is less than or equal to the number M of HARQ processes in SL, where M is a positive integer.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift according to the retransmission scheduling request and determining a terminal for sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift; determining sequence cyclic shift according to the retransmission scheduling request; determining the HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relation, wherein the third mapping relation comprises: a sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift; determining data to be retransmitted according to the HARQ process number; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determining the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request; determining SR bit information according to the retransmission scheduling request; determining the HARQ process number corresponding to the SR bit information according to the SR bit information and a fourth mapping relation, wherein the fourth mapping relation comprises the following steps: SR bit information and a HARQ process number corresponding to the SR bit information; determining data to be retransmitted according to the HARQ process number; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data sent in time units corresponding to the first N time units of the sending opportunity, and the second information is used to indicate the HARQ process number of the data to be retransmitted; the communication apparatus may further include: the data processing unit is used for determining a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determining data needing to be retransmitted according to the first information and the second information; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling; the communication apparatus may further include: the data processing unit is used for determining a terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determining data needing to be retransmitted according to a bitmap; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In an eighth aspect, an embodiment of the present application provides a communication apparatus, which may include: a data receiving unit and a configuration unit. A data receiving unit, configured to receive, by using the configured time-frequency resource of the first uplink control information, second uplink control information sent by the first terminal, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of the time-frequency resource of retransmission data; and the configuration unit is used for scheduling the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
In one possible implementation, the communication apparatus may further include: a data processing unit, configured to determine, according to the retransmission scheduling request, an initial sequence cyclic shift, determine, according to a time-frequency resource bearing second uplink control information and the initial sequence cyclic shift, that a terminal sending the retransmission scheduling request is a first terminal, and determine data to be retransmitted; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the communication apparatus may further include: a data processing unit, configured to determine an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, determine, according to a time-frequency resource carrying second uplink control information, that the terminal sending the retransmission scheduling request is the first terminal, and determine data to be retransmitted; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data transmitted in time units corresponding to the first N time units of the transmission opportunity, and the second information is used to indicate an interval between a time unit receiving a HARQ-ACK feedback message of the data to be retransmitted and the transmission opportunity; the communication apparatus may further include: a data processing unit, configured to determine, according to the first information and the second information, data to be retransmitted, and the network device determines, according to a time-frequency resource carrying the second uplink control information, or according to a time-frequency resource carrying the second uplink control information and an OCC, that a terminal sending a retransmission scheduling request is a first terminal; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted on a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs retransmission scheduling; the communication apparatus may further include: a data processing unit, configured to determine, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to the bitmap, data that needs to be retransmitted; a configuration unit, configured to schedule a time-frequency resource for the first terminal according to data to be retransmitted; wherein, N is the number of time units included in the configured SR retransmission cycle, and N is an integer greater than 1.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift according to the retransmission scheduling request, and determining the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information and the initial sequence cyclic shift; determining sequence cyclic shift according to the retransmission scheduling request; determining the HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relation, wherein the third mapping relation comprises: a sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift; determining data to be retransmitted according to the HARQ process number; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
In another possible implementation manner, the communication apparatus may further include: the data processing unit is used for determining the initial sequence cyclic shift and the OCC according to the retransmission scheduling request, and determining the terminal sending the retransmission scheduling request as a first terminal according to the time-frequency resource bearing the second uplink control information; determining SR bit information according to the retransmission scheduling request; determining the HARQ process number corresponding to the SR bit information according to the SR bit information and a fourth mapping relation, wherein the fourth mapping relation comprises the following steps: SR bit information and a HARQ process number corresponding to the SR bit information; determining data to be retransmitted according to the HARQ process number; and the configuration unit is specifically used for scheduling the time-frequency resource for the first terminal by the data needing to be retransmitted.
In another possible implementation manner, the retransmission scheduling request includes first information and second information, where the first information is used to indicate the number of data to be retransmitted in data sent in time units corresponding to the first N time units of the sending opportunity, and the second information is used to indicate the HARQ process number of the data to be retransmitted; the communication apparatus may further include: a data processing unit, configured to determine, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that a terminal sending the retransmission scheduling request is a first terminal, and determine, according to the first information and the second information, data that needs to be retransmitted; and the configuration unit is specifically configured to schedule a time-frequency resource for the first terminal according to the data to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling; the communication apparatus may further include: a data processing unit, configured to determine, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to the bitmap, data that needs to be retransmitted; a configuration unit, configured to schedule a time-frequency resource for the first terminal according to data to be retransmitted; wherein, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in SL.
In a ninth aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus is a terminal or a chip in the terminal or a system on chip in the terminal; the communication device comprises a processor and a memory; the memory is configured to store computer executable instructions that, when executed by the processor, cause the communication device to perform the method for scheduling retransmission resources as described in the first aspect or in the possible implementation manner of the first aspect, or in any of the possible implementation manners of the second aspect or the second aspect.
In a tenth aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus is a network device, a chip in the network device, or a system on chip in the network device; the communication device comprises a processor and a memory; the memory is configured to store computer executable instructions, which when executed by the processor, cause the communication apparatus to perform the method for scheduling retransmission resources as described in the third aspect or the possible implementation manner of the third aspect, or any one of the possible implementation manners of the fourth aspect or the fourth aspect.
In an eleventh aspect, an embodiment of the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is executed on a computer, the computer is caused to execute the method for scheduling retransmission resources according to the foregoing first aspect or the possible implementation manner of the first aspect, or any one of the possible implementation manners of the second aspect or the second aspect.
In a twelfth aspect, an embodiment of the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer is caused to execute the method for scheduling retransmission resources according to any one of the possible implementations of the third aspect or the third aspect, or the possible implementations of the fourth aspect or the fourth aspect.
In a thirteenth aspect, the present invention provides a communication system, which may include the communication apparatus according to the fifth aspect or the sixth aspect, and the communication apparatus according to the seventh aspect or the eighth aspect.
It is to be understood that the communication apparatus according to the fifth aspect to the tenth aspect, the computer-readable storage medium according to the eleventh aspect, the computer-readable storage medium according to the twelfth aspect, and the communication system according to the thirteenth aspect are all configured to perform the corresponding methods provided above, and therefore, the beneficial effects achieved by the communication apparatus can refer to the beneficial effects of the corresponding methods provided above, and are not described herein again.
Drawings
Fig. 1 is a schematic diagram of a request resource scheduling provided in the prior art;
fig. 2 is a schematic diagram illustrating a communication system according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating a communication device according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a method for scheduling retransmission resources according to an embodiment of the present application;
fig. 5 is a flowchart illustrating another scheduling method for retransmission resources according to an embodiment of the present application;
fig. 6 is a schematic configuration diagram of a SR retransmission cycle according to an embodiment of the present application;
Fig. 7 is a schematic configuration diagram of another SR retransmission cycle according to an embodiment of the present application;
fig. 8 is a schematic diagram illustrating a format of a retransmission scheduling request according to an embodiment of the present application;
fig. 9 is a schematic format diagram of another retransmission scheduling request according to an embodiment of the present application;
fig. 10 is a schematic diagram of a request for retransmission resource scheduling according to an embodiment of the present application;
fig. 11 is a schematic diagram of another scheduling of request retransmission resources according to an embodiment of the present application;
fig. 12 is a flowchart illustrating another scheduling method for retransmission resources according to an embodiment of the present application;
fig. 13 is a flowchart illustrating another scheduling method for retransmission resources according to an embodiment of the present application;
fig. 14 is a schematic diagram illustrating a format of uplink control information according to an embodiment of the present application;
fig. 15 is a schematic diagram illustrating a composition of another communication device according to an embodiment of the present application;
fig. 16 is a schematic composition diagram of another communication device according to an embodiment of the present application.
Detailed Description
Currently, unmanned driving/automated driving technologies are gaining attention from large car enterprises. The third generation partnership project (3 GPP) proposed a cellular network-based V2X technology that can interconnect vehicles, provide a networked driving (connected driving) function for vehicles, so that the vehicles can sense the presence of surrounding vehicles, and implement direct interaction with the surrounding vehicles, such as collision warning, pedestrian warning, etc. Wherein the internet driving function may be provided including: vehicle-to-vehicle (V2V), vehicle-to-human (V2P), vehicle-to-infrastructure (V2I), and vehicle-to-network (V2N). Except for the data communication in V2N using uplink and downlink, the other services, namely data communication in V2V/V2I/V2P, all use SL. In SL communication, terminals may communicate directly with each other without forwarding through a network device, such as a base station. In the V2X technology, the terminal may refer to a vehicle-mounted communication module or a communication terminal, a handheld communication terminal, a Road Side Unit (RSU), and the like.
Currently, SL communication includes two communication modes: mode1 and mode 2. The mode1 is SL communication scheduled by the network device, and the terminal may send control information (or called Sidelink Control Information (SCI)) and data of the SL communication on the scheduled time-frequency resources according to the scheduling of the network device. mode2 is non-scheduled SL communication, and the terminal can select the time frequency resources required by SL communication from the available time frequency resources contained in the resource pool (resource pool) and then send control information and data on the selected time frequency resources. It should be noted that in mode1, only control information is exchanged between the terminal and the network device, and no data is transmitted or received. In addition, the time-frequency resources may include time-domain resources (or referred to as time resources) and frequency-domain resources (or referred to as frequency resources). For the time domain resource, it can be different time granularities such as frame, subframe, time slot, micro-slot, symbol, etc. For frequency domain resources, a frequency band for SL communication may be divided into a plurality of resource blocks (resource blocks), or the frequency band for SL communication may be divided into a plurality of subchannels (subchannels), where each subchannel includes a certain number of resource blocks. One transmission (e.g., transmission of control information or data) on the SL may occupy one or more resource blocks or subchannels. Here, the control information may be transmitted through a physical downlink control channel (PSCCH), and the data may be transmitted through a physical downlink shared channel (PSCCH).
In addition, in V2X based on 5G NR, not only broadcast transmission on SL but also unicast and multicast transmission on SL is introduced. In unicast/multicast transmission, HARQ technology may be used to improve transmission reliability and reduce transmission delay. Therefore, the 3GPP standard defines a physical link feedback channel (PSFCH) for transmitting side uplink feedback control information (SFCI) in SL communication. For example, the method can be used at least for the receiver to feed back, to the sender, the HARQ-ACK feedback message whether the reception is successful, and can also be used for the receiver to feed back, to the sender, other information, such as a channel state report (CSI), a Reference Signal Received Power (RSRP), interference information measured by the receiver, and an available time-frequency resource perceived by the receiver.
The sending end can determine whether data retransmission is needed according to the received HARQ-ACK feedback message. If the transmitting end determines that data retransmission is to be performed, appropriate time-frequency resources can be acquired according to the communication mode (mode1 or mode2) adopted by the transmitting end for performing data retransmission.
In the prior art, if the transmitting end uses the above mode1 for SL communication, when determining to perform data retransmission, the network device may be requested to schedule time-frequency resources for data transmission by transmitting SR and BSR. However, as shown in fig. 1, if the sending end requests the network device to schedule time-frequency resources for data transmission by sending the SR and the BSR, a transmission delay time is caused during retransmission. In addition, the base station may not allocate a proper time-frequency resource size to the transmitting end, so that the transmitting end may not transmit complete retransmission data, the receiving end may not perform merging decoding, and decoding failure may occur.
In order to solve the above problem, an embodiment of the present application provides a method for scheduling retransmission resources: after the first terminal sends data to the second terminal over SL, the first terminal may receive the HARQ-ACK feedback message fed back by the second terminal. According to the received HARQ-ACK feedback message, if the first terminal determines that data retransmission needs to be performed, the first terminal can send a retransmission scheduling request to the network equipment through the configured time-frequency resource at the next sending opportunity of the time unit receiving the HARQ-ACK feedback message in the retransmission SR cycle. The retransmission scheduling request is a new scheduling request introduced by the present application, and its english full name may be: scheduling request for SL transmission, the corresponding english abbreviation may be: SR _ Rx. The retransmission scheduling request may be used to request the network device to schedule time-frequency resources for the first terminal to retransmit data on the SL. Therefore, the network equipment can determine that the terminal requests to schedule the retransmission data according to the retransmission scheduling request, so that the proper time-frequency resource size can be allocated for the retransmission data, and the problems that the second terminal cannot perform merging decoding after receiving the retransmission data and the decoding fails are solved. In addition, the SR retransmission cycle may be designed according to a time unit of the SL, so that the first terminal can timely send the retransmission scheduling request to the network device. Thus, the problem of transmission delay time during retransmission is solved.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Please refer to fig. 2, which is a schematic diagram illustrating a communication system according to an embodiment of the present application. As shown in fig. 2, the communication system may include at least: a first terminal 201, at least one second terminal 202 and a network device 203.
Both the first terminal 201 and the second terminal 202 are capable of V2X communication. With V2X technology based on cellular networks, the first terminal 201 and the second terminal 202 can communicate directly over SL. For example, with the cellular network based V2X technology, the first terminal 201 and the second terminal 202 can directly interact with vehicle data through SL to realize mutual awareness between devices (such as vehicles).
SL communication may include two modes of communication: mode1 and mode 2. In embodiments of the present application, the terminal (e.g., the first terminal 201 and/or the second terminal 202) may operate in mode1, or in both mode1 and mode 2. Illustratively, the first terminal 201 is taken as a transmitting end, and at least one second terminal 202 is taken as a receiving end. In the case where the first terminal employs a model for SL communication with at least one second terminal 202, time-frequency resources for transmitting data on the SL may be scheduled by the network device 203. The first terminal 201 may send data to at least one second terminal 202 by using a unicast or multicast manner through the time-frequency resource. In addition, in unicast/multicast transmission, in order to improve transmission reliability and reduce transmission delay, HARQ technology may be used. That is, the second terminal 202 decodes the received data and may feedback a HARQ-ACK feedback message to the first terminal 201 for indicating whether the data itself transmitted by the first terminal 201 is successfully received. The first terminal 201 may determine whether data retransmission is required according to the HARQ-ACK feedback message.
In SL communication using mode1, when the first terminal 201 determines that data retransmission is needed, the network device 203 may schedule and issue time-frequency resources for retransmission on the SL in advance to the first terminal 201 during initial transmission scheduling. For example, the network device 203 configures the maximum retransmission number of the first terminal 201 to be 3, and the network device 203 may schedule and issue the time-frequency resources used for initial transmission and 3 retransmissions on the SL to the first terminal 201 when performing initial transmission scheduling.
The network device 203 may also schedule only the time-frequency resources for initial transmission on SL when the initial transmission is scheduled. In this manner, if the initial transmission fails, the first terminal 201 may send a retransmission scheduling request to the network device 203, so as to trigger the network device 203 to allocate time-frequency resources for retransmission to the first terminal 201. In this manner, if the initial transmission and the previous retransmissions both fail, the first terminal 201 may also send a retransmission scheduling request to the network device 203 to trigger the network device 203 to allocate the time-frequency resource for retransmission to the first terminal 201. For example, continuing to take the example that the network device 203 configures the maximum retransmission number of the first terminal 201 as 3, the network device 203 may schedule and issue the time-frequency resources used for the initial transmission and the first retransmission on the SL to the first terminal 201 when performing the initial transmission scheduling. The first terminal 201 may send a retransmission scheduling request to the network device 203 if both the initial transmission and the first retransmission fail. The network device 203 may allocate time-frequency resources for retransmission to the first terminal 201 after receiving the retransmission scheduling request. The specific implementation that the first terminal 201 requests scheduling of the time-frequency resource for retransmission, and the network device 203 schedules the time-frequency resource for retransmission for the first terminal 201 will be described in detail in the following method embodiments, which is not described herein again.
In the embodiment of the present application, the first terminal 201 and the second terminal 202 may respectively refer to a vehicle-mounted communication module, a communication terminal or other embedded communication modules, a handheld communication terminal (e.g., a mobile phone, a tablet computer, etc.), an RSU, and the like. In some embodiments, the device modalities of the first terminal 201 and the second terminal 202 may be the same, for example, the first terminal 201 and the second terminal 202 are both vehicle-mounted communication terminals. In other embodiments, the device types of the first terminal 201 and the second terminal 202 may also be different, for example, the first terminal 201 is a vehicle-mounted communication terminal, and the second terminal 202 is an RSU. That is to say, the embodiment of the application is applicable to the scenes of the vehicle-mounted communication module (communication terminal) and the vehicle-mounted communication module (communication terminal), the vehicle-mounted communication module (communication terminal) and the handheld communication terminal, the vehicle-mounted communication module (communication terminal) and the RSU, the handheld communication terminal and the RSU, and the like. As an example, fig. 2 illustrates that the first terminal 201 and the second terminal 202 are both vehicle-mounted communication modules (or vehicle-mounted communication terminals, which are provided in the vehicle shown in fig. 2).
The network device 203 is a device in a wireless network, for example, a Radio Access Network (RAN) node that accesses a terminal (the first terminal 201 and/or the second terminal 202 described above) to the wireless network. Currently, some examples of RAN nodes are: a gbb, a Transmission Reception Point (TRP), an evolved Node B (eNB) (or called macro base station), a micro base station, a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved NodeB or home Node B, HNB), a Base Band Unit (BBU), a base band pool BBU, or a wireless fidelity (Wifi) Access Point (AP), etc. In one network configuration, network device 203 may include a Centralized Unit (CU) node, or a Distributed Unit (DU) node, or a RAN device including a CU node and a DU node. In some embodiments, in the V2X technology, the network device 203 may also be a terminal, which is a terminal in the car networking that can schedule resources for other terminals (such as the first terminal 201), such as a terminal called a head-end terminal or a head-of-group terminal. Of course, the terminal may also have the capability of V2X communication, i.e. data (e.g. vehicle data) can be directly interacted with other terminals (e.g. the first terminal 201 and/or the second terminal 202) through SL.
It should be noted that, in the embodiment of the present application, the cellular network may be a Cloud Radio Access Network (CRAN), a heterogeneous network (HetNet), a Universal Mobile Telecommunications System (UMTS), 4G LTE, or 5G NR, or may be another mobile telecommunications system, such as a next generation mobile telecommunications system, without limitation. In addition, the network device 203 and a terminal, such as the first terminal 201, interact via a Uu (UTRAN-to-UE) air interface.
In a specific implementation, each of the devices shown in fig. 2 has the components shown in fig. 3. Fig. 3 is a schematic composition diagram of a communication device according to an embodiment of the present application. When the communication device performs the function of the terminal (such as the first terminal) in the method embodiment, the communication device may be the terminal or a chip or a system on a chip inside the terminal; when the communication apparatus performs the functions of the network device in the method embodiment, the communication apparatus may be a network device or a chip or a system on chip inside the network device.
As shown in fig. 3, the communication device 300 includes at least one processor 301, a communication line 302, and at least one transceiver 303; further, the communication device shown in fig. 3 may also include a memory 304. The processor 301, the memory 304 and the transceiver 303 may be connected by a communication line 302. In the embodiments of the present application, at least one of the two or more may be one, two, three or more, and the embodiments of the present application are not limited.
In the embodiment of the present application, the processor 301 may be a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The processor may also be any other means having a processing function such as a circuit, device or software module.
In the present embodiment, the communication lines 302 may include pathways for communicating information between components included in the communication device.
In the embodiment of the present application, the transceiver 303 is used for communicating with other devices or communication networks (e.g., ethernet, RAN, Wireless Local Area Networks (WLAN), etc.). The transceiver 303 may be a module, a circuit, a transceiver, or any device capable of enabling communication.
In the present embodiment, the memory 304 may be a read-only memory (ROM) or other types of static storage devices that can store static information and/or instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and/or instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
In one possible design, the memory 304 may exist separately from the processor 301, i.e., the memory 304 may be a memory external to the processor 301, in which case the memory 304 may be coupled to the processor 301 via the communication line 302 for storing instructions or program code. The processor 301, when calling and executing the instructions or program codes stored in the memory 304, can implement the methods provided by the embodiments described below. In yet another possible design, the memory 304 may also be integrated with the processor 301, that is, the memory 304 may be an internal memory of the processor 301, for example, the memory 304 is a cache memory, and may be used for temporarily storing some data and/or instruction information, and the like.
As one implementation, the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in fig. 3. As another implementation, the communication device 300 may include multiple processors, such as the processor 301 and the processor 305 of fig. 3.
It should be noted that the communication apparatus 300 may be a general-purpose device or a special-purpose device. For example, the communication apparatus 300 may be an in-vehicle communication terminal, an RSU, a PDA, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system, or a device having a similar structure as in fig. 3. The embodiment of the present application does not limit the type of the communication apparatus 300. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
The method provided by the embodiment of the present application is described below with reference to the communication system shown in fig. 2. Each of the communication devices mentioned in the following method embodiments may have a component shown in fig. 3, and is not described again. In addition, in the following embodiments of the present application, names of messages interacted among devices or names of parameters in the messages are only an example, and other names may also be used in a specific implementation.
Fig. 4 is a flowchart illustrating a method for scheduling retransmission resources according to an embodiment of the present application, where as shown in fig. 4, the method may include:
in V2X technology based on cellular networks, V2X-capable terminals (such as the first terminal and the second terminal described above) can communicate directly with each other via SL, e.g., data is transmitted between the first terminal and the second terminal via SL. In the following embodiments, the first terminal is a transmitting terminal, and the second terminal is a receiving terminal.
S401, the first terminal sends data to the second terminal on SL.
For example, where the first terminal employs mode1 for SL communication, time-frequency resources used by the first terminal for data transmission may be scheduled by the network device. The first terminal may send data to the second terminal in a unicast or multicast manner through the scheduled time-frequency resource according to the scheduling of the network device.
S402, the first terminal receives the HARQ-ACK feedback message from the second terminal.
Wherein the HARQ-ACK feedback message is used for indicating whether the second terminal successfully receives the data.
For example, after the first terminal sends data to the second terminal, the second terminal may receive the data sent by the first terminal and decode the data. The second terminal may perform HARQ feedback on SL to the first terminal according to the decoding result (correct or fail). For example, the second terminal may feed back the HARQ-ACK feedback message described above to the first terminal.
In some embodiments of the present application, there may be three modes for the second terminal to perform HARQ feedback on SL. Mode 1: ACK/NACK feedback. Specifically, if the second terminal decodes the received data correctly, an ACK is fed back to the first terminal, and if the second terminal fails to decode the received data (or decodes the received data incorrectly), a NACK is fed back to the first terminal. Mode 2: NACK-only feedback. Specifically, if the second terminal decodes the received data correctly, no feedback is made, and if the second terminal fails to decode the received data, NACK is fed back to the first terminal. Mode 3: ACK-only feedback. And if the second terminal decodes the received data correctly, the second terminal feeds back ACK to the first terminal, and if the second terminal fails to decode the received data, the second terminal does not feed back ACK. It should be noted that, the HARQ-ACK feedback message in all embodiments of the present application may be implemented by using any one of the three HARQ feedback modes, and the embodiments of the present application are not specifically limited herein.
And S403, the first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message.
After the first terminal receives the HARQ-ACK feedback message sent by the second terminal, the first terminal can determine whether data retransmission is needed or not according to the HARQ-ACK feedback message. If it is determined that data retransmission is necessary, the following S404 may be performed.
Exemplarily, in combination with the specific implementation of the HARQ-ACK feedback message in S402, the determining, by the first terminal, whether data retransmission needs to be performed according to the HARQ-ACK feedback message specifically may include: in the case where the second terminal performs HARQ feedback using the above-described mode 1, if the first terminal receives NACK, it may be determined that data retransmission is required, and if the first terminal receives ACK, it may be determined that data retransmission is not required. In the case that the second terminal performs HARQ feedback using mode 2, whether to perform data retransmission may be determined according to different strategies. For example, the first terminal determines that retransmission is required as long as NACK is received, and determines that retransmission is not required if NACK is not received. For another example, the first terminal may measure energy of the received NACK, and determine whether retransmission is required according to whether the energy exceeds a preset threshold, for example, if the energy exceeds the preset threshold, it may be considered that more terminals have not been decoded correctly, and at this time, the first terminal may determine that data retransmission is required, and if the energy is lower than the preset threshold, it may be considered that only a few terminals have not been decoded correctly, and at this time, the first terminal may determine that data retransmission is not performed. In the case that the second terminal performs HARQ feedback using mode 3, it may also determine whether to perform data retransmission according to different strategies. For example, the first terminal determines that retransmission is required without receiving the ACK. For another example, the first terminal may measure energy of the received ACK, and determine whether retransmission is needed according to whether the energy exceeds a preset threshold, for example, if the energy exceeds the preset threshold, it may be considered that more terminals decode successfully, and at this time, the first terminal may determine that data retransmission is not needed, and if the energy is lower than the preset threshold, it may be considered that only a few terminals decode successfully, and at this time, the first terminal may determine that data retransmission is needed.
S404, the first terminal sends a retransmission scheduling request to the network equipment through the configured time-frequency resource in the next sending opportunity of the first time unit in the SR retransmission cycle.
Wherein the first time unit is a time unit in which the HARQ-ACK feedback message is received. The retransmission scheduling request is used for requesting to schedule time-frequency resources of retransmission data.
When the first terminal determines that data retransmission is needed, a retransmission scheduling request can be sent to the network device through the time-frequency resource configured by the network device at the next sending opportunity of the time unit for receiving the HARQ-ACK feedback message in the retransmission SR cycle. In this embodiment of the present application, the retransmission scheduling request may be used to request the network device to schedule a time-frequency resource for retransmitting data on the SL for the first terminal. The SR retransmission period is configured by the network device, and the network device is configured according to a time unit of the SL, for example, the SR retransmission period is the same as one time unit of the SL, and for example, the SR retransmission period is the same as N (N is an integer greater than 1) time units of the SL.
S405, the network device receives a retransmission scheduling request sent by the first terminal through the configured time-frequency resource at a sending opportunity in the retransmission SR cycle.
S406, the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
After the first terminal sends the retransmission scheduling request, the network device may receive the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at the sending opportunity. According to the received retransmission scheduling request, the network device can know that the first terminal requests to schedule the time-frequency resource for data retransmission, and thus, the network device can allocate the proper time-frequency resource size to the first terminal so as to be used for the first terminal to perform data retransmission.
According to the scheduling method of the retransmission resources provided by the embodiment of the application, when the first terminal determines that the data retransmission on the SL is required, the network equipment requests the network equipment to schedule the time-frequency resources of the retransmission data on the SL at the sending time of the SR retransmission period by adopting the retransmission scheduling request newly introduced by the embodiment of the application, so that the network equipment can determine that the first terminal requests to schedule the retransmission data, the proper time-frequency resource size can be allocated for the retransmission data, and the problems that the second terminal cannot perform merging and decoding after receiving the retransmission data and the decoding fails are solved. In addition, the SR retransmission cycle can be designed according to the SL time unit, so that the first terminal can send the retransmission scheduling request to the network device in time, and the problem of transmission delay time during retransmission is solved.
It is to be understood that the retransmission scheduling request is Uplink Control Information (UCI), and thus, the retransmission scheduling request may be carried through a Physical Uplink Control Channel (PUCCH). The network device may configure, for each terminal (including the first terminal described above), a dedicated uplink resource for retransmitting the scheduling request through Radio Resource Control (RRC) signaling. For example, a Resource for feeding back the retransmission scheduling request may be indicated by adding a new PUCCH-Resource (Resource) configuration. The resource configuration may include: a Physical Resource Block (PRB) start position, a frequency hopping mode, a PUCCH feedback mode used for a retransmission scheduling request, and the like. In the current standard protocol, the PUCCH includes five feedback modes, which are respectively: format (format)0, format 1, format 2, format 3, format 4. Correspondingly, the PUCCH feedback mode used for retransmitting the scheduling request may also be the above five feedback modes. And the specific PUCCH-resource configuration is different because the PUCCH feedback modes are different. In addition, in the embodiment of the present application, the SR retransmission cycle for transmitting the retransmission scheduling request is configured by the network device, and the network device may be configured according to the time unit of the SL. If the SR retransmission period is the same as one time unit of the SL, or if the SR retransmission period is the same as N (N is an integer greater than 1) time units of the SL.
The following embodiments of the present application specifically describe a scheduling method of retransmission resources provided in the embodiments of the present application according to different PUCCH feedback modes and different SR retransmission cycle configurations.
Fig. 5 is a flowchart illustrating another scheduling method for retransmission resources according to an embodiment of the present application. In the following embodiments, the first terminal is a transmitting terminal, and the second terminal is a receiving terminal. As shown in fig. 5, the method may include: (1) a "resource configuration" procedure, and (2) a "retransmission resource scheduling" procedure.
Wherein, the flow of (1) and resource allocation: the following S501 and S502 may be included.
S501, the first terminal receives the configuration of the network equipment on the SR retransmission period.
Illustratively, when the SL is established, the network device may configure an SR period for each terminal (e.g., including the first terminal) to retransmit the scheduling request through RRC signaling. In the embodiments of the present application, an SR cycle for retransmitting a scheduling request is referred to as a retransmission SR cycle.
The retransmission SR period may be the same as one time unit of SL. The retransmission SR period may also be the same as N time units of SL, N being an integer greater than 1.
For example, the network device may configure the first terminal with a retransmission SR period according to a period of the PSFCH on the SL for carrying the HARQ-ACK feedback message.
It should be noted that, in the embodiment of the present application, a time unit may refer to a time with different time granularities, such as a frame, a subframe, a slot, a micro slot, a symbol, and the like, and the embodiment of the present application is not limited.
For example, on SL, the period of the PSFCH used to carry the HARQ-ACK feedback message may be configured by the network device, e.g., one PSFCH used to carry the HARQ-ACK feedback message is configured every 1 (or 2, or even more) time units, i.e., the period of the PSFCH is 1 time unit (or 2 time units, or even more). The PSFCH used to carry the HARQ-ACK feedback message may also be indicated by the terminal, in which case any time unit may need to be fed back with the HARQ-ACK feedback message. In this embodiment, a retransmission SR period (retransmission scheduling request is interaction between the terminal and the network device, and thus is transmitted through the Uu air interface) may be set to the same time length as one time unit of the SL, so that each PSFCH on the SL may correspond to one PUCCH for carrying the retransmission scheduling request in the time domain. For example, taking time unit as a slot, Uu and SL have the same subcarrier spacing (SCS), that is, the slot of Uu and the slot of SL are aligned, as shown in (a) and (b) of fig. 6, on SL, the configured period of the PSFCH for carrying the HARQ-ACK feedback message is 1 slot. Then, the configurable retransmission SR period is 1 slot. In this way, each time slot is configured with resources for feeding back the retransmission scheduling request. As shown in (a) and (b) of fig. 6, the time-frequency resource (i.e., the current transmission opportunity) configured on the current time slot (e.g., time slot n +1) may be used for the terminal to feed back to the network device whether data corresponding to the PSFCH on the time slot (e.g., time slot n ') corresponding to the previous time slot (i.e., the previous time slot of the current transmission opportunity, e.g., time slot n') on the SL needs retransmission scheduling. Fig. 6 (a) is a schematic diagram of a short (short) PSFCH, and fig. 6 (b) is a schematic diagram of a long (long) PSFCH.
For another example, the retransmission SR period may be set to the same time length as N (N is an integer greater than 1) time units of the SL. Thus, N PSFCHs on SL may correspond to one PUCCH for carrying retransmission scheduling requests in the time domain. For example, taking time units as slots, Uu and SL have the same SCS, i.e. the slot of Uu and the slot of SL are aligned, as shown in (a) and (b) of fig. 7, on SL, the configured period of PSFCH for carrying HARQ-ACK feedback message is 1 slot. The SR period for retransmission is configured to be 2 (i.e., N ═ 2) slots, so that one resource for feeding back the retransmission scheduling request is configured in every two slots. As shown in (a) and (b) of fig. 7, the time-frequency resource (i.e., the current transmission opportunity) configured on the current time slot (e.g., time slot n +2) may be used for the terminal to feed back to the network device whether data corresponding to the PSFCH on the time slots (e.g., time slot n +1 ' and time slot n ') corresponding to the first two time slots (i.e., the first two time slots of the current transmission opportunity, e.g., time slot n +1 and time slot n ') on the SL needs to be retransmitted and scheduled. Fig. 7 (a) is a schematic diagram of a short (short) PSFCH, and fig. 7 (b) is a schematic diagram of a long (long) PSFCH.
S502, the first terminal receives resource configuration from the network equipment.
For example, when the SL is established, the network device may further configure, through RRC signaling, a dedicated uplink resource for retransmitting the scheduling request for each terminal (e.g., including the first terminal). For example, the resource for feeding back the retransmission scheduling request may be indicated by PUCCH-resource configuration. The resources configured by the network device may include: one or more of time domain resources, frequency domain resources and code domain resources. In order to improve the resource utilization rate, the network device may configure the same time-frequency resource for multiple terminals (that is, multiple terminals multiplex the same time-frequency resource) for the feedback of the retransmission scheduling request, and at this time, the different terminals may be distinguished by configuring different code domain resources for the different terminals.
In some embodiments of the present application, the resource configuration of the network device is different according to different PUCCH feedback modes used for retransmission scheduling request.
For example, when the PUCCH feedback mode used for the retransmission scheduling request is format 0: the resource configuration issued by the network device to the first terminal may include: and configuring time domain resources for feeding back the retransmission scheduling request, such as a starting symbol and the number of occupied symbols in a time slot, for example, configuring 1-2 symbols of the retransmission scheduling request occupying one time slot in the time domain. For example, as shown in (a) of fig. 6, the configurable retransmission scheduling request may occupy 1 symbol number from the starting symbol 1 configured in 1 slot, so that the retransmission scheduling request may be transmitted through the 1 st symbol of each slot in the time domain. And configuring code domain resources for feeding back the retransmission scheduling request, such as the initial sequence cyclic shift (m 0). For the frequency domain resource for feeding back the retransmission scheduling request, the frequency domain resource may not be configured in the resource configuration, and the frequency domain resource is configured as: the number of occupied PRBs is 1, that is, the retransmission scheduling request occupies 1 PRB in the frequency domain. The network device may configure different initial sequence cyclic shifts for different terminals so that multiple terminals multiplex the same time-frequency resource. For example, the value of the configured initial sequence cyclic shift may be 0,1, …, 11, so that it may be supported that at most 12 terminals reuse the same time-frequency resource. In addition, after configuring dedicated uplink resources for retransmitting the scheduling request for each terminal, the network device may establish a correspondence between the initial sequence cyclic shift and the terminal identifier.
For the case that the PUCCH feedback mode used for the retransmission scheduling request is format 1: the resource configuration issued by the network device to the first terminal may include: configuring time domain resources for feeding back retransmission scheduling requests, such as a starting symbol and occupied symbol number of a time slot, for example, configuring 4-14 symbols of the retransmission scheduling requests occupying the time slot in the time domain; configuring code domain resources for feeding back retransmission scheduling request, such as initial sequence cyclic shift (e.g. available m)0indicating) and an orthogonal code superposition (OCC), for the frequency domain resource for feeding back the retransmission scheduling request, the resource configuration may not be configured, the frequency domain resource is configured by default such that the number of occupied PRBs is 1, that is, the retransmission scheduling request occupies 1 PRB in the frequency domain, and the network device may configure different initial sequence cyclic shifts and OCCs for different terminals so that multiple terminals multiplex the same time-frequency resource, for example, the value of the configured initial sequence cyclic shift may be 0,1, …, 11, and the value of the OCC may be 0,1, …,6, so that the network device may support the multiplexing of the same time-frequency resource by at most 12 × 7 to 84 terminals After retransmitting the dedicated uplink resource of the scheduling request, the initial sequence cyclic shift and the corresponding relationship between the OCC and the terminal identifier may be established.
When the PUCCH feedback mode used for the retransmission scheduling request is format 2 or format 3: the resource configuration issued by the network device to the first terminal may include: and configuring time domain resources for feeding back the retransmission scheduling request, such as the initial symbol and the occupied symbol number of a time slot, and configuring frequency domain resources for feeding back the retransmission scheduling request, such as the occupied PRB number. Since format 2 and format 3 do not support multiple terminals to multiplex the same time-frequency resource, the resource configuration may not include the configuration of code domain resources.
For the case that the PUCCH feedback mode used for the retransmission scheduling request is format 4: the resource configuration issued by the network device to the first terminal may include: and configuring time domain resources for feeding back the retransmission scheduling request, such as the initial symbol and the occupied symbol number of a time slot, and configuring code domain resources for feeding back the retransmission scheduling request, such as the OCC. For the frequency domain resource for feeding back the retransmission scheduling request, the frequency domain resource may not be configured in the resource configuration, and the frequency domain resource is configured as: the number of occupied PRBs is 1, that is, the retransmission scheduling request occupies 1 PRB in the frequency domain. The network device may configure different OCCs for different terminals, so that multiple terminals multiplex the same time-frequency resource. For example, the configured OCC may take a value of 2 or 4, so that 2 or 4 terminals may be supported to multiplex the same time-frequency resource. In addition, after configuring dedicated uplink resources for retransmitting the scheduling request for each terminal, the network device may establish a corresponding relationship between the OCC and the terminal identifier.
(2) The flow of 'retransmission resource scheduling': the following S503-S509 may be included.
S503, the first terminal sends data to the second terminal on SL.
S504, the first terminal receives the HARQ-ACK feedback message from the second terminal.
And S505, the first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message.
The specific descriptions of S503 to S505 are the same as the descriptions of the corresponding steps of S401 to S403 in the embodiment shown in fig. 4, and are not repeated here.
S506, the first terminal generates a retransmission scheduling request.
When the first terminal determines that data retransmission is needed according to the HARQ-ACK feedback message, the first terminal may generate a retransmission scheduling request.
In the embodiment of the present application, specific processes of generating a retransmission scheduling request by a first terminal are respectively introduced for different retransmission SR cycle configurations (the same as one time unit of an SL, or the same as N time units of an SL) and different PUCCH feedback modes used by a retransmission scheduling request.
In some embodiments, as shown in connection with fig. 6 above, for the case where the retransmission SR period is the same as one time unit of SL.
For example, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since each PSFCH on SL corresponds to one PUCCH for carrying the retransmission scheduling request in the time domain, a sequence used for generating the retransmission scheduling request may be cyclically shifted (sequence cyclic shift, sequence cs, available m) csRepresentation) is preconfigured to a fixed value. E.g., the sequence can be cyclically shifted by mcsIs set to 0. Then, the first terminal may generate a retransmission scheduling request according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift included in the resource configuration of S502. E.g., cyclically shifting m according to the initial sequence 01 and mcsA retransmission scheduling request is generated at 0. Wherein m iscsIs system pre-configured (or preset), using m0And mcsA sequence (i.e., a retransmission scheduling request) may be uniquely determined for a terminal, such as the first terminal.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, each PSFCH on SL corresponds to one PUCCH for carrying the retransmission scheduling request in the time domain, and therefore, SR bit information, such as b (0), for generating the retransmission scheduling request may be preconfigured to a fixed value. Such as b (0) may be set to 0. Then, the first terminal may configure the resource according to the initial resource included in the resource configuration of S502The sequence cyclic shift and the OCC, as well as the preconfigured sequence cyclic shift, generate a retransmission scheduling request. E.g., cyclically shifting m according to the initial sequence0The OCC is 2, and b (0) is 0 to generate a retransmission scheduling request. Where b (0) is system preconfigured (or preset), using m 0OCC and b (0) may uniquely determine a sequence (i.e., the retransmission scheduling request) corresponding to a terminal, such as the first terminal.
It should be noted that, when the SR retransmission period is the same as one time unit of SL, there is no need to feed back whether multiple data need retransmission scheduling at a time, so the retransmission scheduling request may not be transmitted in format 2/3/4 feedback mode.
In other embodiments, as shown in fig. 7 above, the retransmission SR period is the same as N time units of SL, where N is an integer greater than 1.
Illustratively, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since N PSFCHs on SL may correspond to one PUCCH for carrying the retransmission scheduling request in time domain, the cyclic shift of the sequence for generating the retransmission scheduling request (in m) may be configured for different N and KcsRepresentation). In the embodiment of the present application, in the case that the retransmission SR period is configured, that is, N is determined, the different K and sequence cyclic shift correspondences may be referred to as a first mapping relation.
Where K is a time unit in which the terminal receives the HARQ-ACK feedback message, that is, a time unit (referred to as a first time unit in this application) in which the PSFCH feeding back the HARQ-ACK feedback message is located, and an interval between transmission opportunities. K is an integer greater than or equal to 1 and less than or equal to N. Referring to fig. 7, taking an SR retransmission cycle of 2 slots as an example, the value of K may be 1 or 2. K-1 indicates that the interval between the time unit of receiving the HARQ-ACK feedback message and the transmission timing is 1. K-2 indicates that the interval between the time unit of receiving the HARQ-ACK feedback message and the transmission timing is 1. For example, as shown in Table 1, there may be different cyclic shifts of the sequence (in m) for different values of K and N csRepresentation) configuration.
Table 1 SR _ Rx bit information to PUCCH 0 format mapping table
N K＝1 K＝2 K＝3 K＝4 K＝5 K＝6 K＝7 K＝8 …
2 0 6
3 0 6 3
4 0 6 3 9
5 0 6 3 9 1
6 0 6 3 9 1 4
7 0 6 3 9 1 4 7
8 0 6 3 9 1 4 7 10
…
When determining that data retransmission is required, the first terminal may obtain a sequence cyclic shift corresponding to K according to a time unit for receiving the HARQ-ACK feedback message, that is, an interval K between the first time unit and a transmission opportunity and the first mapping relationship. Then, the retransmission scheduling request is generated according to the initial sequence cyclic shift included in the resource configuration of S502 and the obtained sequence cyclic shift corresponding to K.
For example, in connection with fig. 7, the SR retransmission cycle is configured to be 2 slots, i.e., N ═ 2. The first mapping relationship is the second row in table 1, i.e. the first mapping relationship includes: when K is 1, corresponding mcsIs configured as 0; when K is 2, corresponding mcsConfiguration is 6. When the SR retransmission cycle is configured to be 2 slots, 2 PSFCHs on SL correspond to one in time domain for carrying retransmission schedulingThe requested PUCCH, that is, one PUCCH correspondingly feeds back retransmission scheduling requests on two PSFCHs.
Take the example that the first terminal determines that data retransmission is not needed according to the HARQ-ACK feedback message received by the time slot n ', and determines that data retransmission is needed according to the HARQ-ACK feedback message received by the time slot n + 1'. Wherein, the interval between the time slot n + 1' and the time slot n +2 of the sending opportunity is 1. The first terminal can determine m corresponding to K ═ 1 according to the first mapping relation csIs 0. Then, the first terminal cyclically shifts according to the initial sequence included in the resource configuration of S502, e.g., m 01 and the obtained sequence corresponding to K1 is cyclically shifted, i.e. mcsWhen the value is 0, sequence 1 may be generated, and the sequence 1 is the retransmission scheduling request.
Take the example that the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received by the time slot n ', and also determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received by the time slot n + 1'. The interval between the time slot n 'and the time slot n +2 of the sending opportunity is 2, and the interval between the time slot n + 1' and the time slot n +2 of the sending opportunity is 1. The first terminal can determine m corresponding to K ═ 1 according to the first mapping relationcsIs 0, then the first terminal cyclically shifts according to the initial sequence included in the resource configuration of S502, e.g., m 01 and the obtained sequence corresponding to K1 is cyclically shifted, i.e. mcsWhen 0, sequence 1 can be generated. And the first terminal can determine m corresponding to K2 according to the first mapping relationcsTo 6, the first terminal then cyclically shifts according to the initial sequence included in the resource configuration of S502, e.g., m 01 and the obtained sequence corresponding to K2 is cyclically shifted, i.e. m cs Sequence 2 can be generated as 6. Since the retransmission scheduling requests on the two PSFCHs are correspondingly fed back on one PUCCH, the sequence 1 and the sequence 2 are the retransmission scheduling requests.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, N PSFCHs on SL may correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, and therefore, SR bit information (denoted by b (0), b (1)) for generating the retransmission scheduling request may be configured for different N and K. In this embodiment of the application, when the SR retransmission cycle is configured, that is, N is determined, the corresponding relationship between different K and SR bit information may be referred to as a second mapping relationship.
Where K is the interval between the first time unit and the transmission opportunity. K is an integer greater than or equal to 1 and less than or equal to N. The detailed description is the same as that when the PUCCH feedback mode used for retransmission scheduling request is format 0. For example, as shown in table 2, there may be different SR bit information (denoted by b (0), b (1)) configurations for different values of K and N. And in this way the maximum value of N is 4.
Table 2 SR _ Rx bit information to PUCCH 1 format mapping table
Figure BDA0002012745710000251
When determining that data retransmission is needed, the first terminal may obtain SR bit information corresponding to K according to a time unit for receiving the HARQ-ACK feedback message, that is, an interval K between the first time unit and a transmission opportunity and the second mapping relationship. Then, a retransmission scheduling request is generated according to the initial sequence cyclic shift and the OCC included in the resource configuration of S502 and the acquired SR bit information corresponding to K.
For example, in connection with fig. 7, the SR retransmission cycle is configured to be 2 slots, i.e., N ═ 2. The second mapping relationship is the second row in table 1, i.e. the second mapping relationship includes: when K is 1, the corresponding SR bit information is configured such that b (0) is 0; when K is 2, the corresponding SR bit information is configured such that b (0) is 1. When the retransmission SR cycle is configured to be 2 time slots, retransmission scheduling requests on two PSFCHs are correspondingly fed back on one PUCCH.
Take the example that the first terminal determines that data retransmission is not needed according to the HARQ-ACK feedback message received by the time slot n ', and determines that data retransmission is needed according to the HARQ-ACK feedback message received by the time slot n + 1'. Wherein, the interval between the time slot n + 1' and the time slot n +2 of the sending opportunity is 1. The first terminal may determine that the SR bit information corresponding to K ═ 1 is configured to b (0) ═ 0 according to the second mapping relationship. Then, the first terminal according to S502Initial sequence cyclic shift included in resource configuration, e.g. m0When the value of OCC is 1 and the obtained SR bit information corresponding to K is 1, that is, when b (0) is 0, a sequence 3 may be generated, where the sequence 3 is a retransmission scheduling request.
Take the example that the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received by the time slot n ', and also determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received by the time slot n + 1'. The interval between the time slot n 'and the time slot n +2 of the sending opportunity is 2, and the interval between the time slot n + 1' and the time slot n +2 of the sending opportunity is 1. The first terminal may determine that the SR bit information corresponding to K ═ 1 is configured as b (0) ═ 0 according to the second mapping relationship, and then the first terminal may cyclically shift according to the initial sequence, such as m, included in the resource configuration of S502 0Sequence 4 can be generated with OCC equal to 2 and SR bit information corresponding to K equal to 1, i.e., b (0) equal to 0, acquired. And, the first terminal may determine that the SR bit information configuration corresponding to K ═ 2 is b (0) ═ 1 according to the second mapping relationship, and then the first terminal may cyclically shift according to the initial sequence, such as m, included in the resource configuration of S5020Sequence 5 can be generated with OCC equal to 2 and the SR bit information corresponding to K equal to 2, i.e., b (0) equal to 1, obtained. Since the retransmission scheduling requests on the two PSFCHs are correspondingly fed back on one PUCCH, the sequence 4 and the sequence 5 are the retransmission scheduling requests.
If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, similarly, N PSFCHs on SL may correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, that is, one PUCCH corresponds to the retransmission scheduling request fed back on N PSFCHs. In the PUCCH feedback mode, the format of the retransmission scheduling request may adopt any one of the following two UCI formats.
Format 1: the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity. For example, as shown in (a) of fig. 8, the no of SR _ Rx field is used to indicate the number of data that needs to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the remaining fields are all the second information, that is, the interval between the time unit of the HARQ-ACK feedback message for receiving the data that needs to be retransmitted and the transmission opportunity. The number of the second information is the same as the number indicated by the no of SR _ Rx field.
In conjunction with fig. 7, the SR retransmission cycle is configured to be 2 slots, that is, N is 2. The first N time units of the transmission opportunity are the time slot N and the time slot N +1 shown in fig. 7, and the time units corresponding to the first N (N is 2) time units of the transmission opportunity are the time slots for transmitting data corresponding to the time slot N 'and the time slot N + 1' shown in fig. 7. The no of SR _ Rx field is used to indicate the number of data to be retransmitted in the data transmitted on the time slot for transmitting data corresponding to the time slot n 'and the time slot n + 1'. For example, the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received at the time slot n ', and determines that data retransmission does not need to be performed according to the HARQ-ACK feedback message received at the time slot n +1 ', the no of SR _ Rx field is set to 1, and the retransmission scheduling request further includes a second information, where the second information is used to indicate a time unit for receiving the HARQ-ACK feedback message of the data that needs to be retransmitted, that is, an interval between the time slot n ' and a transmission opportunity (that is, the time slot n +2), and the second information is specifically set to 2. For another example, the first terminal determines that data retransmission needs to be performed according to the HARQ-ACK feedback message received at the time slot n ', and determines that data retransmission also needs to be performed according to the HARQ-ACK feedback message received at the time slot n + 1', then the value of the no ofSR _ Rx field is 2, and the retransmission scheduling request further includes two pieces of second information. One of the second information is used to indicate a time unit of receiving the HARQ-ACK feedback message of the data that needs to be retransmitted, that is, an interval between the time slot n' and the transmission opportunity (that is, the time slot n +2), and the value of the second information is specifically 2. And the other second information is used for indicating a time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted, namely an interval between a time slot n + 1' and a sending opportunity (namely a time slot n +2), and the specific value of the second information is 1.
Format 2: the retransmission scheduling request is a bitmap (bitmap) including N bits, and each bit of the N bits is used to indicate whether data transmitted on a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not. Here, 1 may indicate that the data transmitted in the corresponding time unit needs retransmission scheduling, and 0 may indicate that the data transmitted in the corresponding time unit does not need retransmission scheduling. For example, as shown in (b) of fig. 8, the bitmap with N bits sequentially indicates, from the highest bit to the lowest bit, whether or not data transmitted in a time unit corresponding to each of the first N time units of the transmission timing needs retransmission scheduling.
Continuing with fig. 7, the configuration of the SR retransmission cycle is 2 slots, i.e., N is 2. The first N time units of the transmission opportunity are the time slot N and the time slot N +1 shown in fig. 7, and the time units corresponding to the first N (N is 2) time units of the transmission opportunity are the time slot N 'and the time slot N + 1' shown in fig. 7. The retransmission scheduling request is a bitmap comprising 2 bits, wherein the first bit is used to indicate whether the data transmitted on the time slot n 'needs retransmission scheduling and the second bit is used to indicate whether the data transmitted on the time slot n + 1' needs retransmission scheduling.
When the first terminal determines that data retransmission is required, if the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the retransmission scheduling request may be generated according to format 1 or format 2.
If the PUCCH feedback mode used by the retransmission scheduling request is format 4, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3 when determining that data retransmission is required. The difference is that Format 4 supports that multiple terminals multiplex the same time-frequency resource through OCC, so after the retransmission scheduling request is generated, the first terminal may also perform time-domain spreading processing on the generated retransmission scheduling request according to OCC included in the resource configuration of S502.
In some other embodiments, the configuration of the SR retransmission period may also be bound to a HARQ process number (HARQ process ID) in the SL, for example, one resource for feeding back a retransmission scheduling request may be configured for each HARQ process. At this time, if the retransmission SR period is the same as N time units on the SL, the value of N is greater than 1 and less than or equal to the number M of HARQ processes in the SL, where M is a positive integer. For example, 4 HARQ processes are defined in SL, the retransmission SR period is less than or equal to 4 time units on SL. In this way, at each transmission opportunity of the SR retransmission cycle, it can be fed back whether data transmitted on 4 HARQ processes of one terminal needs retransmission scheduling.
The HARQ process number for transmitting data on SL may be allocated by the network device and indicated to the first terminal in Downlink Control Information (DCI). In addition, the HARQ process number may be carried in Sidelink Control Information (SCI) for transmission of HARQ-ACK feedback messages on SL. For example, if the first terminal operates in Mode1 and Mode2 simultaneously, the HARQ process numbers of Mode1 and Mode2 need to be coordinated, for example, the first terminal supports 16 HARQ processes at maximum, and in Mode1 and Mode2 modes, the HARQ process numbers may use different intervals, for example, Mode1 uses HARQ process numbers 1 to 8, and Mode2 uses HARQ process numbers 9 to 16.
Illustratively, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since N HARQ processes on SL may correspond to one PUCCH for carrying the retransmission scheduling request, the cyclic shift of the sequence for generating the retransmission scheduling request may be configured for different HARQ process numbers (in m)csRepresentation). In the embodiment of the present application, when the SR retransmission period is configured, that is, N is determined, the corresponding relationship between different HARQ process numbers and cyclic shifts of sequences may be referred to as a third mapping relationship. If there are 4 HARQ processes on SL, the configuration of cyclic shift of the sequence with HARQ process numbers 1-4 can be as shown in the fourth row in table 1. At this time, K in table 1 denotes an HARQ process number. That is, the third mapping relationship includes: when K is 1 (i.e. HARQ process number is 1), corresponding m csIs configured as 0; when K is 2 (i.e. HARQ process number is 2), the corresponding mcsIs configured as 6; when K is 3 (i.e. HARQ process number is 3), the corresponding mcsIs configured as 3; when K is 4 (i.e. HARQ process number is 4), corresponding mcsConfiguration is 9. Similarly, e.g.If there are 3 HARQ processes on SL, the configuration of cyclic shifts for sequences with HARQ process numbers 1-3 can be as shown in the third row of Table 1 above. If there are 2 HARQ processes on SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1-2 can be as shown in the second row of Table 1 above.
And when determining that data retransmission is needed, the first terminal can determine the HARQ process number according to the received HARQ-ACK feedback message, and acquire the sequence cyclic shift corresponding to the HARQ process number according to the determined HARQ process number and the third mapping relation. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift included in the resource configuration of S502 and the sequence cyclic shift corresponding to the HARQ process number. For example, if there are 4 HARQ processes on SL, when the first terminal determines that data retransmission is required, it determines that the HARQ process number is 2 according to the received HARQ-ACK feedback message, and obtains the sequence cyclic shift corresponding to the HARQ process number 2, that is, m, according to the determined HARQ process number 2 and the third mapping relationship cs6. Then, the first terminal cyclically shifts according to the initial sequence included in the resource configuration of S502, e.g., m 01, and a sequence cyclic shift corresponding to HARQ process number 2, i.e., mcsAs 6, a sequence may be generated, which is a retransmission scheduling request.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, since N HARQ processes on SL may correspond to one PUCCH for carrying the retransmission scheduling request, SR bit information (denoted by b (0), b (1)) for generating the retransmission scheduling request may be configured for different HARQ process numbers. In this embodiment of the application, when the SR retransmission cycle is configured, that is, N is determined, the corresponding relationship between different HARQ process numbers and SR bit information may be referred to as a fourth mapping relationship. If there are 4 HARQ processes on SL, the configuration of cyclic shift of the sequences with HARQ process numbers 1-4 can be as shown in the fourth row in table 2. At this time, K in table 2 denotes an HARQ process number. That is, the fourth mapping relationship includes: when K is 1 (that is, the HARQ process number is 1), the corresponding SR bit information is configured such that b (0) is 0 and b (1) is 0; when K is 2 (that is, the HARQ process number is 2), the corresponding SR bit information is configured such that b (0) is 1, and b (1) is 1; when K is 3 (that is, the HARQ process number is 3), the corresponding SR bit information is configured such that b (0) is 0, and b (1) is 1; when K is 4 (i.e., HARQ process number is 4), the corresponding SR bit information is configured such that b (0) is 1 and b (1) is 0. Similarly, if there are 3 HARQ processes on SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1-3 can be as shown in the third row of Table 2 above. If there are 2 HARQ processes on SL, the configuration of the cyclic shift of the sequences with HARQ process numbers 1-2 can be as shown in the second row of Table 2 above.
And when determining that data retransmission is needed, the first terminal can determine the HARQ process number according to the received HARQ-ACK feedback message, and acquire SR bit information corresponding to the HARQ process number according to the determined HARQ process number and the fourth mapping relation. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC included in the resource configuration of S502, and the SR bit information corresponding to the HARQ process number. For example, if there are 4 HARQ processes on the SL, when the first terminal determines that data retransmission is needed, the first terminal determines that the HARQ process number is 2 according to the received HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number 2 according to the determined HARQ process number 2 and the fourth mapping relationship, that is, b (0) is 1, and b (1) is 1. Then, the first terminal cyclically shifts according to the initial sequence included in the resource configuration of S502, e.g., m0The sequence may be generated by setting OCC to 2 and SR bit information corresponding to HARQ process number 2, i.e., b (0) to 1 and b (1) to 1, and the sequence is a retransmission scheduling request.
If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, similarly, N HARQ processes on SL may correspond to one PUCCH for carrying the retransmission scheduling request. In the PUCCH feedback mode, the format of the retransmission scheduling request may adopt any one of the following two UCI formats.
Format 3: the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for the HARQ process number of the data needing to be retransmitted. For example, as shown in (a) of fig. 9, the no of SR _ Rx field is used to indicate the number of data that needs to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the remaining fields are all the second information, that is, the HARQ process number used to indicate the data that needs to be retransmitted and scheduled. The number of the second information is the same as the number indicated by the no of SR _ Rx field. For example, the retransmission SR period is configured to be 4 slots, that is, N is 4, and there are 4 HARQ processes on SL. If the number of data to be retransmitted in the data transmitted in the time unit corresponding to the first 4 time units of the transmission opportunity is 2, and the HARQ process numbers of the data to be retransmitted and scheduled are 1 and 4, respectively, the value of the no of SR _ Rx field is 2, and the retransmission scheduling request includes two pieces of second information, where one piece of second information specifically takes the value of 1, and the other piece of second information specifically takes the value of 4.
Format 4: the retransmission scheduling request is a bitmap including N bits, each of the N bits for indicating whether data transmitted in each of the N HARQ processes requires retransmission scheduling. Here, 1 may be used to indicate that retransmission scheduling is required for data transmitted by a corresponding HARQ process, and 0 may be used to indicate that retransmission scheduling is not required for data transmitted by a corresponding HARQ process. For example, as shown in (b) of fig. 9, the bitmap with N bits sequentially indicates whether data transmitted by each of the N HARQ processes needs retransmission scheduling from the highest bit to the lowest bit. For example, take 4 HARQ processes on SL as an example. If data corresponding to HARQ process numbers 1 and 2 in 4 HARQ processes needs to be retransmitted and scheduled, and data corresponding to HARQ process numbers 3 and 4 do not need to be retransmitted and scheduled, the 4-bit bitmap may be 1100.
When the first terminal determines that data retransmission is required, if the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the retransmission scheduling request may be generated according to format 3 or format 4.
If the PUCCH feedback mode used by the retransmission scheduling request is format 4, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3 when determining that data retransmission is required. The difference is that Format 4 supports that multiple terminals multiplex the same time-frequency resource through OCC, so after the retransmission scheduling request is generated, the first terminal may also perform time-domain spreading processing on the generated retransmission scheduling request according to OCC included in the resource configuration of S502.
S507, the first terminal sends a retransmission scheduling request to the network equipment through the configured time-frequency resource in the next sending opportunity of the first time unit in the SR retransmission cycle.
Wherein the first time unit is a time unit in which the HARQ-ACK feedback message is received. The retransmission scheduling request is used for requesting to schedule time-frequency resources of retransmission data.
When the first terminal determines that data retransmission is required, a retransmission scheduling request may be sent to the network device through the time-frequency resource configured in S502 at a next sending opportunity of the time unit that receives the HARQ-ACK feedback message in the retransmission SR period. For example, referring to fig. 6, the first time unit is a time slot n', and after the first terminal generates the retransmission scheduling request in the above-mentioned manner in S506, the retransmission scheduling request may be sent to the network device through the time-frequency resource configured in S502 in the time slot n +1 shown in the figure. For another example, referring to fig. 7, the first time unit may be a time slot n', and after the first terminal generates the retransmission scheduling request in the manner in S506, the retransmission scheduling request may be sent to the network device through the time-frequency resource configured in S502 in the time slot n +2 shown in the figure. Of course, in the manner shown in fig. 7, if it is determined that the data sent by the two slots both need to be retransmitted according to the HARQ-ACK feedback messages fed back at the slot n 'and the slot n + 1', the first terminal may feed back the retransmission scheduling request of the two slots, i.e., the slot n 'and the slot n + 1', at the slot n + 2.
S508, the network device receives the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at a sending opportunity in the retransmission SR cycle.
S509, the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
After the first terminal sends the retransmission scheduling request, the network device may receive the retransmission scheduling request sent by the first terminal through the configured time-frequency resource at the sending opportunity. According to the received retransmission scheduling request, the network device may determine that the terminal requesting scheduling of retransmission resources is the first terminal, and may determine which data retransmission resources the first terminal requests scheduling. The network device may allocate a suitable time-frequency resource size to the first terminal according to the determined result, so as to be used for the first terminal to perform data retransmission.
It can be understood that, in S506, for different retransmission SR cycle configurations (the same as one time unit of the SL, or the same as N time units of the SL), and different PUCCH feedback modes used by the retransmission scheduling request, the specific process of generating the retransmission scheduling request by the first terminal is different, and therefore, after receiving the retransmission scheduling request, the network device may also determine the terminal requesting to schedule the retransmission resource, and which retransmission resource of data the terminal requests to schedule according to the different retransmission SR cycle configurations and the different PUCCH feedback modes used by the retransmission scheduling request.
In some embodiments, as shown in connection with fig. 6 above, for the case where the retransmission SR period is the same as one time unit of SL.
For example, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the network device may perform sequence blind detection on the configured time-frequency resource at a transmission opportunity in the retransmission SR period, and at this time, if the retransmission scheduling request is received (i.e., detected), the network device may determine the initial sequence cyclic shift according to the retransmission scheduling request. Because the initial sequence cyclic shift and the terminal identification have a corresponding relationship, the network device can determine the terminal sending the retransmission scheduling request, namely the first terminal, according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift. And since one PSFCH corresponds to one PUCCH for carrying a retransmission scheduling request in the time domain, the network device may further determine which data the first terminal requests to schedule the retransmission resource. Therefore, the network equipment can schedule time-frequency resources for the first terminal according to the determined data needing to be retransmitted.
For example, the specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is may be: as shown in (a) of fig. 10, taking as an example that Uu and SL have the same SCS, the slot of Uu and the slot of SL are aligned. Assuming that a time slot in which a first terminal receives scheduling Downlink Control Information (DCI) transmitted on a Physical Downlink Control Channel (PDCCH) by a network device is n, and assuming that a time interval from a pscch to the PDCCH is preconfigured/configured to 1, the first terminal may transmit sidestream data in an n +1 th time slot. Also assuming that the time interval from the pre-configured/configured PSFCH to the PSSCH is 2, the first terminal may receive the HARQ-ACK feedback message, such as NACK, fed back by the second terminal at the n +3 th slot. The first terminal may transmit a retransmission scheduling request at an n +4 th slot if 1 slot after receiving the NACK is one transmission opportunity. That is, the network device may receive the retransmission scheduling request at the n +4 th time slot. The network device can determine the initial sequence cyclic shift according to the received retransmission scheduling request, and can determine the terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift. The network device may further determine that the data to be retransmitted is the sideline data scheduled at the nth time slot according to the retransmission scheduling request received at the (n + 4) th time slot. That is, it is determined that the data requested by the first terminal to schedule the retransmission resource is the sideline data scheduled at the nth time slot. If Uu and SL have different SCS's, as shown in (b) and (c) of fig. 10, the network device can determine in which slot the data requesting scheduling of retransmission resources is the sideline data scheduled according to the respective multiple relationship of the SCS's of Uu and SL.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, the network device may perform sequence blind detection on the configured time-frequency resource at a sending opportunity in the retransmission SR period, and at this time, if the retransmission scheduling request is received (i.e., detected), the network device may determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request. Because the initial sequence cyclic shift and the OCC have a corresponding relationship with the terminal identifier, the network device may determine, according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift and OCC, the terminal that sent the retransmission scheduling request, that is, the first terminal. And since one PSFCH corresponds to one PUCCH for carrying a retransmission scheduling request in the time domain, the network device may further determine which data the first terminal requests to schedule the retransmission resource. Therefore, the network equipment can schedule time-frequency resources for the first terminal according to the determined data needing to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource is may refer to the PUCCH feedback mode as a specific description in format 0, and is not described in detail here.
In other embodiments, as shown in fig. 7 above, the retransmission SR period is the same as N time units of SL, where N is an integer greater than 1.
For example, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the network device may perform sequence blind detection on the configured time-frequency resource at a transmission opportunity in the retransmission SR period, and at this time, if the retransmission scheduling request is received (i.e., detected), the network device may determine the initial sequence cyclic shift according to the retransmission scheduling request. Because the initial sequence cyclic shift and the terminal identification have a corresponding relationship, the network device can determine the terminal sending the retransmission scheduling request, namely the first terminal, according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device may further determine a sequence cyclic shift according to the retransmission scheduling request, and determine K corresponding to the sequence cyclic shift according to the sequence cyclic shift and the first mapping relationship, where the K is an interval between a time unit (i.e., a PSFCH) receiving the HARQ feedback information and a transmission opportunity. In this way, the network device may determine, according to the determined time unit (i.e., PSFCH) for receiving the HARQ feedback information and the interval K of the transmission opportunity, which data the first terminal requests to schedule the retransmission resource. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource may refer to a configured retransmission SR period being the same as one time unit of the SL, and the PUCCH feedback mode is specifically described in format 0, and is not described in detail here.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, the network device may perform sequence blind detection on the configured time-frequency resource at a sending opportunity in the retransmission SR period. At this time, if a retransmission scheduling request is received (i.e., detected), the network device may determine an initial sequence cyclic shift and an OCC according to the retransmission scheduling request. Because the initial sequence cyclic shift and the OCC have a corresponding relationship with the terminal identifier, the network device may determine, according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift and OCC, the terminal that sent the retransmission scheduling request, that is, the first terminal. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device may further determine SR bit information according to the retransmission scheduling request, and determine K corresponding to the SR bit information according to the SR bit information and the second mapping relationship, where the K is an interval between a time unit (i.e., a PSFCH) receiving the HARQ feedback information and a transmission opportunity. In this way, the network device may determine, according to the determined time unit (i.e., PSFCH) for receiving the HARQ feedback information and the interval K of the transmission opportunity, which data the first terminal requests to schedule the retransmission resource. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource may refer to a configured retransmission SR period being the same as one time unit of the SL, and the PUCCH feedback mode is specifically described in format 0, and is not described in detail here.
If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, similarly, the network device may perform sequence blind detection on the configured time-frequency resource at a sending opportunity in the retransmission SR period. At this time, if a retransmission scheduling request is received (i.e., detected), the network device may determine, according to the retransmission scheduling request, a terminal that requests scheduling of retransmission resources and which data retransmission resources the terminal requests scheduling. For example, if the format of the retransmission scheduling request is format 1, the network device may determine, according to the time-frequency resource carrying the retransmission scheduling request, the terminal that sends the retransmission scheduling request, that is, the first terminal. The number of data to be retransmitted in the data sent in the time units corresponding to the first N time units of the sending opportunity can be determined according to the first information, and the sideline data scheduled in which time slot the data to be retransmitted is according to the interval between the time unit indicated by each second information and the sending opportunity, at which the HARQ-ACK feedback message of the data to be retransmitted is received, can be finally determined. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted. The specific implementation of the network device determining which data the terminal requests to schedule the retransmission resource may refer to a configured retransmission SR period being the same as one time unit of the SL, and the PUCCH feedback mode is specifically described in format 0, and is not described in detail here.
For another example, if the format of the retransmission scheduling request is format 2, the network device may determine, according to the time-frequency resource carrying the retransmission scheduling request, the terminal that sends the retransmission scheduling request, that is, the first terminal. According to the indication of each bit in the bitmap, the data needing to be retransmitted can be determined to be the side-row data scheduled in which time slot. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted.
If the PUCCH feedback mode used by the retransmission scheduling request is format 4, the network device determines, according to the retransmission scheduling request, a terminal that requests scheduling of retransmission resources and which data retransmission resource the terminal requests scheduling, to be the specific implementation of format 2/3 with reference to the PUCCH feedback mode. The difference is that the Format 4 supports that multiple terminals multiplex the same time-frequency resource through the OCC, and the network device determines the terminal requesting for scheduling retransmission resources according to the time-frequency resource bearing the retransmission scheduling request and the OCC.
In other embodiments, if the configuration of the SR retransmission cycle is bound to the HARQ process number in the SL, and the PUCCH feedback mode used in the scheduling retransmission request is different, the network device determines the terminal requesting scheduling of the retransmission resource and the specific implementation of the retransmission resource of which data the terminal requests scheduling is different.
For example, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the network device may perform sequence blind detection on the configured time-frequency resource at a transmission opportunity in the retransmission SR period, and at this time, if the retransmission scheduling request is received (i.e., detected), the network device may determine the initial sequence cyclic shift according to the retransmission scheduling request. Because the initial sequence cyclic shift and the terminal identification have a corresponding relationship, the network device can determine the terminal sending the retransmission scheduling request, namely the first terminal, according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device may further determine a sequence cyclic shift according to the retransmission scheduling request, and may determine an HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and the third mapping relationship. Thus, the network device can determine which data the first terminal requests to schedule retransmission resources according to the determined HARQ process number. For example, as shown in fig. 11, taking an SR retransmission cycle as 4 slots as an example, the first terminal receives 2 NACKs in one SR retransmission cycle, and according to the correspondence between the PSFCH and the psch, the first terminal may obtain the process number of the psch corresponding to the NACK reception. The first terminal sends a retransmission scheduling request at the latest arrival sending opportunity, and the network equipment can acquire the process number corresponding to the data needing to be retransmitted according to the retransmission scheduling request. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, the network device may perform sequence blind detection on the configured time-frequency resource at a sending opportunity in the retransmission SR period, and at this time, if the retransmission scheduling request is received (i.e., detected), the network device may determine the initial sequence cyclic shift and the OCC according to the retransmission scheduling request. Because the initial sequence cyclic shift and the OCC have a corresponding relationship with the terminal identifier, the network device may determine, according to the time-frequency resource bearing the retransmission scheduling request and the determined initial sequence cyclic shift and OCC, the terminal that sent the retransmission scheduling request, that is, the first terminal. Since the N PSFCHs correspond to one PUCCH for carrying the retransmission scheduling request in the time domain, the network device may further determine SR bit information according to the retransmission scheduling request, and may determine the HARQ process number corresponding to the SR bit information according to the SR bit information and the fourth mapping relationship. Thus, the network device can determine which data the first terminal requests to schedule retransmission resources according to the determined HARQ process number. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted.
If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, similarly, the network device may perform sequence blind detection on the configured time-frequency resource at a sending opportunity in the retransmission SR period. At this time, if a retransmission scheduling request is received (i.e., detected), the network device may determine, according to the retransmission scheduling request, a terminal that requests scheduling of retransmission resources and which data retransmission resources the terminal requests scheduling. For example, if the format of the retransmission scheduling request is format 3, the network device may determine, according to the time-frequency resource carrying the retransmission scheduling request, the terminal that sends the retransmission scheduling request, that is, the first terminal. The number of data to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity can be determined according to the first information, and the data to be retransmitted can be finally determined as the sideline data scheduled in which time slot according to the HARQ process number of the data to be retransmitted, which is indicated by each second information. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted.
For another example, if the format of the retransmission scheduling request is format 4, the network device may determine, according to the time-frequency resource carrying the retransmission scheduling request, the terminal that sends the retransmission scheduling request, that is, the first terminal. According to the indication of each bit in the bitmap, the HARQ process number of the data needing to be retransmitted can be determined, and the data needing to be retransmitted can be further determined. Therefore, the network device can schedule the time-frequency resource for the first terminal according to the determined data needing to be retransmitted.
If the PUCCH feedback mode used by the retransmission scheduling request is format 4, the network device determines, according to the retransmission scheduling request, a terminal that requests scheduling of retransmission resources and which data retransmission resource the terminal requests scheduling, to be the specific implementation of format 2/3 with reference to the PUCCH feedback mode. The difference is that the Format 4 supports that multiple terminals multiplex the same time-frequency resource through the OCC, and the network device determines the terminal requesting for scheduling retransmission resources according to the time-frequency resource bearing the retransmission scheduling request and the OCC.
According to the scheduling method of the retransmission resources provided by the embodiment of the application, when the first terminal determines that the data retransmission on the SL is required, the network equipment requests the network equipment to schedule the time-frequency resources of the retransmission data on the SL at the sending time of the SR retransmission period by adopting the retransmission scheduling request newly introduced by the embodiment of the application, so that the network equipment can determine that the first terminal requests to schedule the retransmission data, the proper time-frequency resource size can be allocated for the retransmission data, and the problems that the second terminal cannot perform merging and decoding after receiving the retransmission data and the decoding fails are solved. In addition, the SR retransmission cycle can be designed according to the SL time unit, so that the first terminal can send the retransmission scheduling request to the network device in time, and the problem of transmission delay time during retransmission is solved.
In addition, different code domain resource divisions are designed according to different SR retransmission cycles, so that multiple terminals can multiplex the same time-frequency resource to transmit the retransmission scheduling request, and the utilization rate of network resources is improved.
The embodiments shown in fig. 4 and fig. 5 are implemented by configuring dedicated uplink resources for the retransmission scheduling request to transmit the retransmission scheduling request. When a terminal, such as a first terminal, determines that data retransmission is required, if there are time-frequency resources, such as configured Uu, for transmitting HARQ-ACK feedback messages or SR or CSI, etc., the first terminal may reuse the time-frequency resources to transmit a retransmission scheduling request to a network device. The following is described in detail with reference to the embodiments shown in fig. 12 and 13.
Fig. 12 is a flowchart illustrating another scheduling method for retransmission resources according to an embodiment of the present application, and as shown in fig. 12, the method may include:
s1201, the first terminal transmits data to the second terminal on the SL.
S1202, the first terminal receives a HARQ-ACK feedback message from the second terminal.
Wherein the HARQ-ACK feedback message is used for indicating whether the second terminal successfully receives the data.
S1203, the first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message.
The specific descriptions of S1201-S1203 are the same as the descriptions of the corresponding steps S401-S403 in the embodiment shown in fig. 4, and are not repeated here.
S1204, if the first terminal is configured with the time-frequency resource of the first uplink control information, the first terminal sends second uplink control information through the configured time-frequency resource of the first uplink control information, wherein the second uplink control information comprises a retransmission scheduling request, or the second uplink control information comprises the retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used for requesting to schedule the time-frequency resource of retransmission data.
When the first terminal determines that data retransmission is needed, if there are time-frequency resources of the first uplink control information, such as HARQ-ACK feedback information or SR or CSI, configured for Uu at the time, the first terminal may transmit a retransmission scheduling request to the network device through the time-frequency resources. In this embodiment of the present application, the retransmission scheduling request may be used to request the network device to schedule a time-frequency resource for retransmitting data on the SL for the first terminal.
And S1205, the network equipment receives the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information.
S1206, the network equipment schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
After the network device receives the retransmission scheduling request on the configured time-frequency resource of the first uplink control information, according to the received retransmission scheduling request, the network device can know that the first terminal is the time-frequency resource for requesting scheduling for data retransmission, and thus, the network device can allocate a proper time-frequency resource size to the first terminal for the data retransmission of the first terminal.
According to the scheduling method of retransmission resources provided by the embodiment of the application, when the first terminal determines that data retransmission on the SL is required, if the time-frequency resources such as HARQ-ACK feedback messages or SR or CSI for Uu are configured right, by adopting the retransmission scheduling request newly introduced by the embodiment of the application, the time-frequency resources for retransmitting data on the SL are requested to be scheduled to the network equipment on the time-frequency resources, so that the network equipment can determine that the first terminal requests to schedule the retransmission data, the proper time-frequency resources can be allocated for the retransmission data, and the problem that the second terminal cannot do combined decoding after receiving the retransmission data and fails in decoding is solved. Meanwhile, the first terminal can also send the retransmission scheduling request to the network equipment in time, so that the problem of transmission delay time during retransmission is solved.
Similarly, when the PUCCH feedback modes used by the retransmission scheduling request are different, the specific PUCCH-resource configuration is different. The following embodiments specifically describe the scheduling method of retransmission resources provided in the embodiments of the present application according to different PUCCH feedback modes
Fig. 13 is a flowchart illustrating another scheduling method for retransmission resources according to an embodiment of the present application. In the following embodiments, the first terminal is a transmitting terminal, and the second terminal is a receiving terminal. As shown in fig. 13, the method may include: (1) a "resource configuration" procedure, and (2) a "retransmission resource scheduling" procedure.
Wherein, the flow of (1) and resource allocation: the following S1301 may be included.
S1301, the first terminal receives resource configuration from the network equipment.
Illustratively, the network device may configure, through RRC signaling, resources for each terminal (e.g., including the first terminal) to transmit the first control information. The first control information may refer to information such as HARQ-ACK feedback message of Uu, SR, or CSI. The resources configured by the network device may include: one or more of time domain resources, frequency domain resources and code domain resources. In order to improve the resource utilization, the network device may configure the same time-frequency resource for multiple terminals (that is, multiple terminals multiplex the same time-frequency resource) for feedback of the first control information, and at this time, if the retransmission scheduling request also multiplexes the time-frequency resource, the network device may configure different code domain resources for different terminals to distinguish the different terminals.
In some embodiments, the resource configuration of the network device is different for different PUCCH feedback modes used for retransmission scheduling requests.
For example, when the PUCCH feedback mode used for the retransmission scheduling request is format 0: the resource configuration issued by the network device to the first terminal may include: time domain resources for transmitting the first control information, such as a start symbol and a number of occupied symbols in one slot, are configured. For the frequency domain resource for transmitting the first control information, the resource configuration may not be configured, and the frequency domain resource is configured as: the number of occupied PRBs is 1, that is, the first control information occupies 1 PRB in the frequency domain. And configuring code domain resources for feeding back the retransmission scheduling request, such as the initial sequence cyclic shift (m 0). The network device may configure different initial sequence cyclic shifts for different terminals so that multiple terminals multiplex the same time-frequency resource. In addition, after configuring the initial sequence cyclic shift for each terminal, the network device may establish a corresponding relationship between the initial sequence cyclic shift and the terminal identifier.
For the case that the PUCCH feedback mode used for the retransmission scheduling request is format 1: the resource configuration issued by the network device to the first terminal may include: configuring time domain resources for transmitting first control information, such as a starting symbol and the number of occupied symbols in a time slot; for the frequency domain resource for transmitting the first control information, the resource configuration may not be configured, and the frequency domain resource is configured as: the number of occupied PRBs is 1. Configuring code domain resources for feeding back retransmission scheduling request, such as initial sequence cyclic shift (e.g. available m) 0Representative) and OCC. The network equipment can facilitate a plurality of terminals by configuring different initial sequence cyclic shifts and OCCs for different terminalsThe terminal multiplexes the same time-frequency resources. In addition, after configuring the initial sequence cyclic shift and the OCC for each terminal, the network device may establish a correspondence between the initial sequence cyclic shift and the OCC and the terminal identifier.
When the PUCCH feedback mode used for the retransmission scheduling request is format 2 or format 3: the resource configuration issued by the network device to the first terminal may include: configuring time domain resources for transmitting the first control information, such as a starting symbol and the number of occupied symbols in a time slot, and configuring frequency domain resources for transmitting the first control information, such as the number of occupied PRBs. Since format 2 and format 3 do not support multiple terminals to multiplex the same time-frequency resource, the resource configuration may not include the configuration of code domain resources.
For the case that the PUCCH feedback mode used for the retransmission scheduling request is format 4: the resource configuration issued by the network device to the first terminal may include: configuring time domain resources for transmitting first control information, such as a starting symbol and the number of occupied symbols in a time slot; for the frequency domain resource for transmitting the first control information, the resource configuration may not be configured, and the frequency domain resource is configured as: the number of occupied PRBs is 1. And configuring code domain resources, such as OCC, for feeding back the retransmission scheduling request. The network device may configure different OCCs for different terminals, so that multiple terminals multiplex the same time-frequency resource. In addition, after the network device configures the OCC for each terminal, a corresponding relationship between the OCC and the terminal identifier may be established.
(2) The flow of 'retransmission resource scheduling': the following S1302-S1308 may be included.
S1302, the first terminal sends data to the second terminal over the SL.
S1303, the first terminal receives the HARQ-ACK feedback message from the second terminal.
And S1304, the first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message.
The specific descriptions of S1302 to S1304 are the same as the descriptions of the corresponding steps of S401 to S403 in the embodiment shown in fig. 4, and are not repeated here.
S1305, the first terminal generates a retransmission scheduling request.
When the first terminal determines that data retransmission is needed according to the HARQ-ACK feedback message, the first terminal may generate a retransmission scheduling request.
In the embodiment of the present application, specific processes of generating a retransmission scheduling request by a first terminal are introduced respectively for different PUCCH feedback modes used by the retransmission scheduling request.
In some embodiments, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, since there may be a case where different first control information and the retransmission scheduling request multiplex the same time-frequency resource, a sequence cyclic shift (in m) for generating the retransmission scheduling request may be configured for the difference of the first control information of the time-frequency resource multiplexed with the retransmission scheduling request csRepresentation). In the embodiment of the present application, the correspondence between the second control information and the sequence cyclic shift may be referred to as a first mapping relationship. The second control information comprises a retransmission scheduling request, or the second control information comprises the retransmission scheduling request and the first control information of the time-frequency resource multiplexed with the retransmission scheduling request.
For example, if the retransmission scheduling request reuses time-frequency resources for SR transmission of Uu, the first mapping relationship, i.e. the second control information and sequence cyclic shift correspondence relationship, may be as shown in table 3. Here, the SR of the Uu may be a scheduling request for UL or a scheduling request for SL. In table 3, the positive SR indicates that the second control information includes an SR of Uu. The positive SR _ Rx indicates that the second control information includes a retransmission scheduling request. The positive SR + positive SR _ Rx indicates that the second control information includes an SR of Uu and a retransmission scheduling request.
Table 3 SR and SR _ Rx bit information to PUCCH 0 format mapping table
Positive SR mcs＝0
Positive SR_Rx mcs＝6
Positive SR+Positive SR_Rx mcs＝3
For another example, if the retransmission scheduling request reuses time-frequency resources for 1-bit (bit) HARQ-ACK feedback message of Uu and/or SR transmission of Uu, the first mapping relationship, i.e. the second control information and sequence cyclic shift correspondence relationship, may be as shown in table 4. In table 4, HARQ-ACK indicates that the second control information includes the HARQ-ACK feedback message of Uu. HARQ-ACK + positive SR indicates that the second control information includes the SR of Uu and the HARQ-ACK feedback message of Uu. HARQ-ACK + positive SR _ Rx indicates that the second control information includes a retransmission scheduling request and a HARQ-ACK feedback message of Uu. And the HARQ-ACK + positive SR + positive SR _ Rx shows that the second control information comprises the SR of Uu, the HARQ-ACK feedback message of Uu and the retransmission scheduling request.
TABLE 4 SR, 1bit HARQ-ACK feedback message and SR _ Rx bit information to PUCCH 0 Format mapping table
Bit dereferencing of HARQ-ACK feedback messages 0 1
HARQ-ACK mcs＝0 mcs＝6
HARQ-ACK+positive SR mcs＝3 mcs＝9
HARQ-ACK+positive SR_Rx mcs＝1 mcs＝7
HARQ-ACK+positive SR+positive SR_Rx mcs＝4 mcs＝10
For another example, if the retransmission scheduling request reuses the time-frequency resources for 2-bit HARQ-ACK feedback message of Uu and/or SR transmission of Uu, the first mapping relationship, i.e. the second control information and sequence cyclic shift correspondence relationship, may be as shown in table 5. In table 5, HARQ-ACK indicates that the second control information includes the HARQ-ACK feedback message of Uu. The HARQ-ACK + positive SR indicates that the second control information includes the SR of Uu and the HARQ-ACK feedback message of Uu. HARQ-ACK + positive SR _ Rx indicates that the second control information includes a retransmission scheduling request and a HARQ-ACK feedback message of Uu. And the HARQ-ACK + positive SR + positive SR _ Rx shows that the second control information comprises the SR of Uu, the HARQ-ACK feedback message of Uu and the retransmission scheduling request.
TABLE 5 SR, 2bit HARQ-ACK feedback message and SR _ Rx bit information to PUCCH 0 Format mapping table
Figure BDA0002012745710000361
When determining that data retransmission is required, the first terminal may obtain a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and the first mapping relationship shown in table 3, table 4, or table 5. Then, according to the initial sequence cyclic shift sum included in the resource configuration of S1301 and the second uplink And generating a retransmission scheduling request by the cyclic shift of the sequence corresponding to the control information. For example, referring to table 3, taking the time-frequency resource used for the re-transmission scheduling request to reuse the SR for Uu as an example, when it is determined that data retransmission is needed, if there is exactly configured time-frequency resource for the SR for Uu, it is assumed that there is also an SR for Uu to send at this time, that is, the second control message needs to include the SR for Uu and the re-transmission scheduling request. The first terminal can obtain the cyclic shift m of the sequence according to the first mapping relation shown in table 3cs3. Then, according to the initial sequence cyclic shift included in the resource configuration of S1301, such as m 01, and a sequence cyclic shift m corresponding to the second uplink control informationcsAs 3, a sequence may be generated, which is a retransmission scheduling request.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, similarly, since there may be a case where different first control information and the retransmission scheduling request multiplex the same time-frequency resource, SR bit information (denoted by b (0) and b (1)) for generating the retransmission scheduling request may be configured for different first control information that multiplexes the time-frequency resource with the retransmission scheduling request. In this embodiment of the present application, the corresponding relationship between the second control information and the SR bit information may be referred to as a second mapping relationship. The second control information comprises a retransmission scheduling request, or the second control information comprises the retransmission scheduling request and the first control information of the time-frequency resource multiplexed with the retransmission scheduling request.
For example, if the retransmission scheduling request reuses time-frequency resources for SR transmission of Uu, the second mapping relationship, i.e. the second control information and SR bit information correspondence relationship, may be as shown in table 6. Here, the SR of the Uu may be a scheduling request for UL or a scheduling request for SL. In table 6, the positive SR indicates that the second control information includes an SR of Uu. positivesrx indicates that the second control information includes a retransmission scheduling request. The positive SR + positive SR _ Rx indicates that the second control information includes an SR of Uu and a retransmission scheduling request.
Table 6 SR and SR _ Rx bit information to PUCCH 1 format mapping table
Positive SR b(0)＝0
Positive SR_Rx b(0)＝1
Positive SR+Positive SR_Rx b(0)＝0,b(1)＝1
When determining that data retransmission is required, the first terminal may obtain SR bit information corresponding to the second uplink control information according to the second uplink control information and the second mapping relationship shown in table 6. Then, a retransmission scheduling request is generated according to the initial sequence cyclic shift and 0CC included in the resource configuration of S1301, and SR bit information corresponding to the second uplink control information. For example, referring to table 6, when it is determined that data retransmission is required, if there is time-frequency resource of SR configured for Uu, it is assumed that there is SR for Uu that needs to be transmitted at this time, that is, the second control message needs to include SR for Uu and a retransmission scheduling request. The first terminal may obtain the SR bit information according to the second mapping relationship shown in table 6, that is, b (0) is 0 and b (1) is 1. Then, according to the initial sequence cyclic shift included in the resource configuration of S1301, such as m 0When the value of OCC is 1 and SR bit information corresponding to the second uplink control information, i.e., b (0) is 0 and b (1) is 1, a sequence, i.e., a retransmission scheduling request, may be generated.
It should be noted that the PUCCH feedback mode used by the retransmission scheduling request is format 0/1, and is only applicable to a scenario where a retransmission scheduling request on one PSFCH is correspondingly fed back on one PUCCH, and if a retransmission scheduling request on multiple PSFCHs is correspondingly fed back on one PUCCH (for example, a corresponding scenario in the embodiment shown in fig. 5), at this time, a retransmission scheduling request can only be fed back for one of the multiple PSFCHs, for example, a timeslot or HARQ process number corresponding to the PSFCH closest to the timeslot where the transmission opportunity is located.
If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the HARQ-ACK feedback message and/or SR and/or CSI of Uu that needs to multiplex a time-frequency resource with the retransmission scheduling request and the retransmission scheduling request may be combined to generate a new UCI format, as shown in fig. 14, and then the new UCI format is uniformly encoded and transmitted.
Wherein, in FIG. 14, OACKThe number of information bits of the HARQ-ACK feedback message when the HARQ-ACK feedback message of Uu exists; o isSRThe information bit number when the SR with Uu exists; o is CSIThe number of information bits of CSI contained when uplink channel information is fed back; o isSR_RxThe number of information bits of the retransmission scheduling request included when there is a retransmission scheduling request. In addition, the format of the retransmission scheduling request generated by the first terminal may refer to format 1 and format 2 in the embodiment shown in fig. 5, and details are not described here.
If the PUCCH feedback mode used by the retransmission scheduling request is format 4, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3 when determining that data retransmission is required. The difference is that Format 4 supports that multiple terminals multiplex the same time-frequency resource through OCC, so after the retransmission scheduling request is generated, the first terminal may also perform time-domain spreading processing on the generated retransmission scheduling request according to OCC included in the resource configuration of S1301.
In some other embodiments, the terminal sending the retransmission scheduling request may also be distinguished by using the HARQ process number.
Illustratively, if the PUCCH feedback mode used by the retransmission scheduling request is format 0, the cyclic shift of the sequence used for generating the retransmission scheduling request may be configured for different HARQ process numbers (in m)csRepresentation). In the embodiment of the present application, the correspondence between different HARQ process numbers and sequence cyclic shifts may be referred to as a third mapping relationship. When the first terminal determines that data retransmission is needed, the first terminal can determine the HARQ process number according to the received HARQ-ACK feedback message and according to the received HARQ-ACK feedback message And acquiring the sequence cyclic shift corresponding to the HARQ process number according to the determined HARQ process number and the third mapping relation. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift included in the resource configuration of S1301 and the sequence cyclic shift corresponding to the HARQ process number.
If the PUCCH feedback mode used by the retransmission scheduling request is format 1, SR bit information (denoted by b (0), b (1)) for generating the retransmission scheduling request may be configured for different HARQ process numbers. In this embodiment of the present application, the corresponding relationship between different HARQ process numbers and SR bit information may be referred to as a fourth mapping relationship. And when determining that data retransmission is needed, the first terminal can determine the HARQ process number according to the received HARQ-ACK feedback message, and acquire SR bit information corresponding to the HARQ process number according to the determined HARQ process number and the fourth mapping relation. Then, the first terminal generates a retransmission scheduling request according to the initial sequence cyclic shift, the OCC included in the resource configuration of S1301, and SR bit information corresponding to the HARQ process number.
If the PUCCH feedback mode used by the retransmission scheduling request is format 2/3, the HARQ-ACK feedback message and/or SR and/or CSI of Uu that needs to multiplex a time-frequency resource with the retransmission scheduling request and the retransmission scheduling request may be combined to generate a new UCI format, as shown in fig. 14, and then the new UCI format is uniformly encoded and transmitted. The format of the retransmission scheduling request generated by the first terminal may refer to format 3 and format 4 in the embodiment shown in fig. 5, and details are not described here.
If the PUCCH feedback mode used by the retransmission scheduling request is format 4, the first terminal may generate the retransmission scheduling request in a manner that the PUCCH feedback mode is format 2/3 when determining that data retransmission is required. The difference is that Format 4 supports that multiple terminals multiplex the same time-frequency resource through OCC, so after the retransmission scheduling request is generated, the first terminal may also perform time-domain spreading processing on the generated retransmission scheduling request according to OCC included in the resource configuration of S1301.
S1306, if the first terminal is configured with the time-frequency resource of the first uplink control information, the first terminal sends the second uplink control information through the configured time-frequency resource of the first uplink control information, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of the time-frequency resource of the retransmission data.
When the first terminal determines that data retransmission is needed, if there are time-frequency resources of the first uplink control information, such as HARQ-ACK feedback information or SR or CSI, configured for Uu at the time, the first terminal may transmit a retransmission scheduling request to the network device through the time-frequency resources.
S1307, the network device receives, through the configured time-frequency resource of the first uplink control information, the second uplink control information sent by the first terminal.
S1308, the network device schedules the time-frequency resource of the retransmission data for the first terminal according to the retransmission scheduling request.
After the network device receives the second uplink control information sent by the first terminal through the configured time-frequency resource of the first uplink control information, the network device can obtain the retransmission scheduling request from the second uplink control information. According to the obtained retransmission scheduling request, the network device can determine that the terminal requesting to schedule the retransmission resource is the first terminal, and can determine which data retransmission resource the first terminal requests to schedule. The network device may allocate a suitable time-frequency resource size to the first terminal according to the determined result, so as to be used for the first terminal to perform data retransmission.
It can be understood that, in S1305, the specific process of generating the retransmission scheduling request by the first terminal is different according to different PUCCH feedback modes used for the retransmission scheduling request, and therefore, after receiving the retransmission scheduling request, the network device may also determine the terminal requesting to schedule the retransmission resource and which retransmission resource of data is requested to be scheduled by the terminal according to different PUCCH feedback modes used for the retransmission scheduling request.
The specific implementation of the terminal that requests to schedule the retransmission resource and which data retransmission resource the terminal requests to schedule is determined by the network device according to the retransmission scheduling request is similar to that in S509 in the embodiment shown in fig. 5, except that when the terminal that requests to schedule the retransmission resource and which data retransmission resource the terminal requests to schedule are determined, the time-frequency resource that carries the second uplink control information is used instead of the time-frequency resource that carries the retransmission scheduling request, which is not described in detail herein.
According to the scheduling method of retransmission resources provided by the embodiment of the application, when the first terminal determines that data retransmission on the SL is required, if the time-frequency resources such as HARQ-ACK feedback messages or SR or CSI for Uu are configured right, by adopting the retransmission scheduling request newly introduced by the embodiment of the application, the time-frequency resources for retransmitting data on the SL are requested to be scheduled to the network equipment on the time-frequency resources, so that the network equipment can determine that the first terminal requests to schedule the retransmission data, the proper time-frequency resources can be allocated for the retransmission data, and the problem that the second terminal cannot do combined decoding after receiving the retransmission data and fails in decoding is solved. Meanwhile, the first terminal can also send the retransmission scheduling request to the network equipment in time, so that the problem of transmission delay time during retransmission is solved. In addition, according to the embodiment of the application, different code domain resources are designed to distinguish different terminals according to different uplink control information of the same time frequency resource multiplexed with the retransmission scheduling request, so that the utilization rate of network resources is improved.
The above-mentioned scheme provided by the embodiments of the present application is mainly introduced from the perspective of interaction between the nodes. It is understood that each node, for example, a network device, a terminal, etc., contains a corresponding hardware structure and/or software module for performing each function in order to realize the functions. Those skilled in the art will readily appreciate that the present application is capable of being implemented in hardware or a combination of hardware and computer software in connection with the examples described herein for the embodiments disclosed. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. 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.
In the embodiment of the present application, the network device and the terminal may be divided into the functional modules according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
Fig. 15 is a schematic composition diagram of a communication device according to an embodiment of the present application. The communication device according to the embodiment may be a terminal or a chip or a system on a chip in the terminal. The communication device may be adapted to perform the functions of the first terminal in the above-described method embodiments. In one implementation, as shown in fig. 15, the communication device may include: a control unit 1501, a data transmission unit 1502, and a data reception unit 1503.
The control unit 1501 may be configured to determine whether to request retransmission resources from the network device according to the received HARQ-ACK feedback information. The data transmission unit 1502 may be configured to convert the digital baseband signal into a signal suitable for wireless transmission, and transmit the signal over the air interface. The data receiving unit 1503 may be configured to receive a signal from an air interface and convert the wireless signal into a digital baseband signal.
In some embodiments, a data transmission unit 1502 is configured to transmit data to the second terminal over the SL. A data receiving unit 1503, configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data. A control unit 1501, configured to determine that data needs to be retransmitted according to the received HARQ-ACK feedback message. The data sending unit 1502 is further configured to send, in a retransmission SR period and at a next sending opportunity of a first time unit, a retransmission scheduling request to the network device through the configured time-frequency resources, where the retransmission scheduling request is used to request scheduling of the time-frequency resources of the retransmitted data, and the first time unit is a time unit that receives the HARQ-ACK feedback message.
In one example, the retransmission SR period may be the same as one time unit of the SL.
The communication apparatus may further include: a data processing unit 1504 that can be used for data signal processing such as data generation and physical layer encoding when data is transmitted; and data signal processing such as decoding at the time of data reception.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource for feeding back the retransmission scheduling request and the initial sequence cyclic shift. A data processing unit 1504, configured to generate a retransmission scheduling request according to the initial sequence cyclic shift and the preconfigured sequence cyclic shift.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request, the initial sequence cyclic shift, and the OCC. A data processing unit 1504, configured to generate a retransmission scheduling request according to the initial sequence cyclic shift, the OCC, and the preconfigured SR bit information.
In another example, the retransmission SR period is the same as N time units of SL, N being an integer greater than 1.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource for feeding back the retransmission scheduling request and the initial sequence cyclic shift. A data processing unit 1504, configured to obtain a sequence cyclic shift corresponding to K according to an interval K between a first time unit and a transmission opportunity and a first mapping relationship, where K is an integer greater than or equal to 1 and less than or equal to N, and the first mapping relationship includes: and K and the sequence cyclic shift corresponding to K, and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to K.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request, the initial sequence cyclic shift, and the OCC. A data processing unit 1504, configured to obtain, according to the interval K between the first time unit and the sending opportunity and a second mapping relationship, SR bit information corresponding to K, where the second mapping relationship includes: k and SR bit information corresponding to K; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the K.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request. A data processing unit 1504 for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit for receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not.
In another example, N is less than or equal to the number M of HARQ processes in SL, M being a positive integer.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the time-frequency resource for feeding back the retransmission scheduling request and the initial sequence cyclic shift. A data processing unit 1504, configured to determine an HARQ process number according to the HARQ-ACK feedback message, and obtain a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, where the third mapping relationship includes: HARQ process number and the sequence cyclic shift corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request, the initial sequence cyclic shift, and the OCC. A data processing unit 1504, configured to determine an HARQ process number according to the HARQ-ACK feedback message, and obtain, according to the HARQ process number and a fourth mapping relationship, SR bit information corresponding to the HARQ process number, where the fourth mapping relationship includes: HARQ process number and SR bit information corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the HARQ process number.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure time-frequency resources for feeding back the retransmission scheduling request. A data processing unit 1504 for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, each of the N bits being used to indicate whether data transmitted in each of the N HARQ processes requires retransmission scheduling.
In another example, the resource configuration is further used for configuring an OCC for feeding back the retransmission scheduling request; the data processing unit 1504 is further configured to perform time domain spreading processing on the retransmission scheduling request through the OCC.
In some other embodiments, a data transmission unit 1502 for transmitting data to a second terminal over SL; a data receiving unit 1503, configured to receive a HARQ-ACK feedback message from the second terminal, where the HARQ-ACK feedback message is used to indicate whether the second terminal successfully receives data; a control unit 1501, configured to determine that data needs to be retransmitted according to the HARQ-ACK feedback message; the data sending unit 1502 is further configured to send, if the communication apparatus is configured with the time-frequency resource of the first uplink control information, second uplink control information through the configured time-frequency resource of the first uplink control information, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of the time-frequency resource of retransmitted data.
In an example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the initial sequence cyclic shift and a time-frequency resource for transmitting the first uplink control information. A data processing unit 1504, configured to obtain a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and a first mapping relationship, where the first mapping relationship includes the second uplink control information and the sequence cyclic shift corresponding to the second uplink control information; and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure an initial sequence cyclic shift, OCC, and a time-frequency resource for transmitting the first uplink control information. A data processing unit 1504, configured to obtain, according to the second uplink control information and a second mapping relationship, SR bit information corresponding to the second uplink control information, where the second mapping relationship includes: second uplink control information, and SR bit information corresponding to the second uplink control information; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the second uplink control information.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for transmitting the first uplink control information. A data processing unit 1504 for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit for receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not, N is the number of time units included in the configured retransmission SR period, and N is an integer greater than 1.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure the initial sequence cyclic shift and a time-frequency resource for transmitting the first uplink control information. A data processing unit 1504, configured to determine an HARQ process number according to the HARQ-ACK feedback message, and obtain a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relationship, where the third mapping relationship includes: HARQ process number and the sequence cyclic shift corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure an initial sequence cyclic shift, OCC, and a time-frequency resource for transmitting the first uplink control information. A data processing unit 1504, configured to determine an HARQ process number according to the HARQ-ACK feedback message, and obtain, according to the HARQ process number and a fourth mapping relationship, SR bit information corresponding to the HARQ process number, where the fourth mapping relationship includes: HARQ process number and SR bit information corresponding to the HARQ process number; and generating a retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the SR bit information corresponding to the HARQ process number.
In another example, the data receiving unit 1503 is further configured to receive a resource configuration from the network device, where the resource configuration is used to configure a time-frequency resource for transmitting the first uplink control information. A data processing unit 1504 for generating a retransmission scheduling request; the retransmission scheduling request comprises first information and second information, wherein the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or, the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling, N is the number of time units included in the configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in SL.
In another example, the resource configuration is further used for configuring an OCC for feeding back the retransmission scheduling request; the data processing unit 1504 is further configured to perform time domain spreading processing on the retransmission scheduling request through the OCC.
The communication device provided in the embodiment of the present application may perform the actions of the first terminal in the method embodiments corresponding to fig. 4, fig. 5, fig. 12, and fig. 13, which have similar implementation principles and technical effects, and are not described herein again.
As yet another implementation, a communication device may include: a processing module and a communication module. The processing module may integrate the functions of the data processing unit 1504 and the control unit 1501, and the communication module may integrate the functions of the data transmission unit 1502 and the data reception unit 1503. The processing module is used for controlling and managing the action of the communication device, and the communication module is used for supporting the communication between the communication device and other network entities. Further, the communication device may also include a storage module for storing program codes and data of the communication device.
The processing module may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module may be a transceiver circuit or a communication interface, etc. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device may be the communication device shown in fig. 3.
Fig. 16 is a schematic composition diagram of another communication device according to an embodiment of the present application. The communication apparatus according to this embodiment may be a network device or a chip or a system on a chip in a network device. The communication device may be configured to perform the functions of the network device in the above method embodiments. In one implementation, as shown in fig. 16, the communication device may include: a data receiving unit 1601 and a configuration unit 1602.
In some embodiments of the present application, as an example, the data receiving unit 1601 is configured to receive, at a sending opportunity in a retransmission SR period, a retransmission scheduling request sent by a first terminal through configured time-frequency resources, where the retransmission scheduling request is used to request scheduling of the time-frequency resources of retransmission data; a configuration unit 1602, configured to schedule, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal.
As yet another example, the retransmission SR period is the same as one time unit of the SL, which is a link for data transmission between the first terminal and the second terminal.
As yet another example, the communication apparatus may further include: a data processing unit 1603, configured to determine an initial sequence cyclic shift according to the retransmission scheduling request, determine, according to a time-frequency resource bearing the retransmission scheduling request and the initial sequence cyclic shift, that a terminal sending the retransmission scheduling request is a first terminal, and determine data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, determine, according to a time-frequency resource carrying the retransmission scheduling request, the terminal sending the retransmission scheduling request as a first terminal by the initial sequence cyclic shift and the OCC, and determine data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As yet another example, the retransmission SR period is the same as N time units of SL, N being an integer greater than 1.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift according to the retransmission scheduling request, and determine, as the first terminal, a terminal that sends the retransmission scheduling request according to the time-frequency resource that carries the retransmission scheduling request and the initial sequence cyclic shift; determining sequence cyclic shift according to the retransmission scheduling request; determining K corresponding to the sequence cyclic shift according to the sequence cyclic shift and a first mapping relation, wherein the K is an interval between a first time unit and a sending opportunity, and the first mapping relation comprises: the method comprises the steps of sequence cyclic shift and K corresponding to the sequence cyclic shift, wherein a first time unit is the time unit when a first terminal receives a HARQ-ACK feedback message; determining data to be retransmitted according to K; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, and determine, according to a time-frequency resource carrying the retransmission scheduling request, the terminal sending the retransmission scheduling request as the first terminal by the initial sequence cyclic shift and the OCC; determining SR bit information according to the retransmission scheduling request; determining K corresponding to the SR bit information according to the SR bit information and a second mapping relation, wherein K is an interval between the first time unit and the sending opportunity, and the second mapping relation comprises: SR bit information and K corresponding to the SR bit information, wherein the first time unit is a time unit for the first terminal to receive the HARQ-ACK feedback message; determining data to be retransmitted according to K; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As still another example, the retransmission scheduling request includes first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the retransmission scheduling request, or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine data to be retransmitted according to the first information and the second information; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the retransmission scheduling request, or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to a bitmap, data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As yet another example, N is less than or equal to the number M of HARQ processes in SL, M being a positive integer.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift according to the retransmission scheduling request, and determine, as the first terminal, a terminal that sends the retransmission scheduling request according to the time-frequency resource that carries the retransmission scheduling request and the initial sequence cyclic shift; determining sequence cyclic shift according to the retransmission scheduling request; determining the HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relation, wherein the third mapping relation comprises: a sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift; determining data to be retransmitted according to the HARQ process number; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, and determine, according to a time-frequency resource carrying the retransmission scheduling request, the terminal sending the retransmission scheduling request as the first terminal by the initial sequence cyclic shift and the OCC; determining SR bit information according to the retransmission scheduling request; determining the HARQ process number corresponding to the SR bit information according to the SR bit information and a fourth mapping relation, wherein the fourth mapping relation comprises the following steps: SR bit information and a HARQ process number corresponding to the SR bit information; determining data to be retransmitted according to the HARQ process number; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As still another example, the retransmission scheduling request includes first information and second information, the first information is used to indicate the number of data that needs to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used to indicate the HARQ process number of the data that needs to be retransmitted. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the retransmission scheduling request, or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine data to be retransmitted according to the first information and the second information; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, each of the N bits being used to indicate whether data transmitted in each of the N HARQ processes requires retransmission scheduling. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the retransmission scheduling request, or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to a bitmap, data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
In other embodiments of the present application, as an example, the data receiving unit 1601 is configured to receive second uplink control information sent by the first terminal through configured time-frequency resources of the first uplink control information, where the second uplink control information includes a retransmission scheduling request, or the second uplink control information includes a retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used to request scheduling of the time-frequency resources of retransmission data; a configuration unit 1602, configured to schedule, according to the retransmission scheduling request, a time-frequency resource of retransmission data for the first terminal.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift according to the retransmission scheduling request, determine, according to the time-frequency resource bearing the second uplink control information and the initial sequence cyclic shift, that the terminal sending the retransmission scheduling request is the first terminal, and determine data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As another example, the data processing unit 1603 is configured to determine initial sequence cyclic shift and OCC according to the retransmission scheduling request, determine, according to a time-frequency resource carrying second uplink control information, that a terminal sending the retransmission scheduling request is a first terminal, and determine data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As still another example, the retransmission scheduling request includes first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity. A data processing unit 1603, configured to determine, according to the first information and the second information, data to be retransmitted, and the network device determines, according to a time-frequency resource carrying the second uplink control information or according to a time-frequency resource carrying the second uplink control information and an OCC, that a terminal sending a retransmission scheduling request is a first terminal; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted on a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs retransmission scheduling. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the second uplink control information or according to the time-frequency resource bearing the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to the bitmap, data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for a first terminal according to data that needs to be retransmitted; wherein, N is the number of time units included in the configured SR retransmission cycle, and N is an integer greater than 1.
As another example, the data processing unit 1603 is configured to determine an initial sequence cyclic shift according to the retransmission scheduling request, and determine, according to a time-frequency resource carrying the second uplink control information and the initial sequence cyclic shift, that the terminal sending the retransmission scheduling request is the first terminal; determining sequence cyclic shift according to the retransmission scheduling request; determining the HARQ process number corresponding to the sequence cyclic shift according to the sequence cyclic shift and a third mapping relation, wherein the third mapping relation comprises: a sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift; determining data to be retransmitted according to the HARQ process number; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
As another example, the data processing unit 1603 is configured to determine initial sequence cyclic shift and OCC according to the retransmission scheduling request, and determine, according to a time-frequency resource carrying second uplink control information, that a terminal sending the retransmission scheduling request is a first terminal; determining SR bit information according to the retransmission scheduling request; determining the HARQ process number corresponding to the SR bit information according to the SR bit information and a fourth mapping relation, wherein the fourth mapping relation comprises the following steps: SR bit information and a HARQ process number corresponding to the SR bit information; determining data to be retransmitted according to the HARQ process number; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal by using data that needs to be retransmitted.
As still another example, the retransmission scheduling request includes first information and second information, the first information is used to indicate the number of data that needs to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used to indicate the HARQ process number of the data that needs to be retransmitted. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the second uplink control information or according to the time-frequency resource bearing the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to the first information and the second information, data that needs to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for the first terminal according to data that needs to be retransmitted.
Or, the retransmission scheduling request is a bitmap including N bits, each of the N bits being used to indicate whether data transmitted in each of the N HARQ processes requires retransmission scheduling. A data processing unit 1603, configured to determine, according to the time-frequency resource bearing the second uplink control information or according to the time-frequency resource bearing the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, and determine, according to the bitmap, data to be retransmitted; a configuration unit 1602, configured to schedule a time-frequency resource for a first terminal according to data that needs to be retransmitted; wherein, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in SL.
The communication apparatus provided in the embodiment of the present application may perform the actions of the network device in the method embodiments corresponding to fig. 4, or fig. 5, or fig. 12, or fig. 13, which have similar implementation principles and technical effects, and are not described herein again.
As yet another implementation, a communication device may include: a processing module and a communication module. The processing module may integrate the functions of the configuration unit 1602 and the data processing unit 1603, and the communication module may integrate the functions of the data receiving unit 1601. The processing module is used for controlling and managing the action of the communication device, and the communication module is used for supporting the communication between the communication device and other network entities. Further, the communication device may also include a storage module for storing program codes and data of the communication device.
The processing module may be a processor or a controller. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. A processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a DSP and a microprocessor, or the like. The communication module may be a transceiver circuit or a communication interface, etc. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device may be the communication device shown in fig. 3.
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. The procedures or functions according to the embodiments of the present application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The term "plurality" herein means two or more. 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 the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".
The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application.

Claims (44)

1. A method for scheduling retransmission resources, comprising:
the first terminal sends data to the second terminal on a sidelink SL;
the first terminal receives a physical layer hybrid automatic repeat request (HARQ-ACK) feedback message from the second terminal, wherein the HARQ-ACK feedback message is used for indicating whether the second terminal successfully receives the data;
The first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message;
and the first terminal sends a retransmission scheduling request to network equipment through configured time-frequency resources at the next sending opportunity of a first time unit in a SR cycle of the retransmission scheduling request, wherein the retransmission scheduling request is used for requesting to schedule the time-frequency resources for retransmitting the data, and the first time unit is the time unit for receiving the HARQ-ACK feedback message.
2. The method of claim 1, wherein the SR retransmission period is the same as one time unit of the SL.
3. The method according to claim 2, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR period, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources and initial sequence cyclic shift for feeding back the retransmission scheduling request;
the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and a pre-configured sequence cyclic shift.
4. The method according to claim 2, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR period, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back the retransmission scheduling request, initial sequence cyclic shift and superposed orthogonal code OCC;
and the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift, the OCC and the preconfigured SR bit information.
5. The method of claim 1, wherein the SR retransmission period is the same as N time units of the SL, where N is an integer greater than 1.
6. The method according to claim 5, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR period, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources and initial sequence cyclic shift for feeding back the retransmission scheduling request;
The first terminal obtains a sequence cyclic shift corresponding to the K according to a first mapping relation and an interval K between the first time unit and the sending opportunity, where K is an integer greater than or equal to 1 and less than or equal to N, and the first mapping relation includes: k, and a sequence cyclic shift corresponding to K;
and the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the K.
7. The method according to claim 5, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR period, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back the retransmission scheduling request, initial sequence cyclic shift and OCC;
the first terminal obtains SR bit information corresponding to K according to the interval K between the first time unit and the transmission opportunity and a second mapping relationship, where the second mapping relationship includes: k and SR bit information corresponding to K;
And the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift, the OCC and SR bit information corresponding to K.
8. The method according to claim 5, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR period, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back the retransmission scheduling request;
the first terminal generates the retransmission scheduling request;
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or the like, or, alternatively,
the retransmission scheduling request is a bitmap including N bits, and each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted or not.
9. The method of claim 5, wherein N is less than or equal to M, a positive integer, of the number of HARQ processes in the SL.
10. The method according to claim 9, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR cycle, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources and initial sequence cyclic shift for feeding back the retransmission scheduling request;
the first terminal determines an HARQ process number according to the HARQ-ACK feedback message, and obtains a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relation, wherein the third mapping relation comprises: the HARQ process number and a sequence cyclic shift corresponding to the HARQ process number;
and the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.
11. The method according to claim 9, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR cycle, the method further comprises:
The first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back the retransmission scheduling request, initial sequence cyclic shift and OCC;
the first terminal determines an HARQ process number according to the HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relation, wherein the fourth mapping relation comprises: the HARQ process number and SR bit information corresponding to the HARQ process number;
and the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift, the OCC and SR bit information corresponding to the HARQ process number.
12. The method according to claim 9, wherein before the first terminal transmits the retransmission scheduling request to the network device through the configured time-frequency resource at the next transmission occasion of the first time unit in the SR cycle, the method further comprises:
the first terminal receives resource configuration from the network equipment, wherein the resource configuration is used for configuring time-frequency resources for feeding back the retransmission scheduling request;
the first terminal generates the retransmission scheduling request;
The retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or the like, or, alternatively,
the retransmission scheduling request is a bitmap including N bits, each of the N bits being used to indicate whether data transmitted in each of the N HARQ processes requires retransmission scheduling.
13. The method according to claim 8 or 12, wherein the resource configuration is further used for configuring an OCC for feeding back the retransmission scheduling request;
after the first terminal generates the retransmission scheduling request, the method further includes: and the first terminal carries out time domain spread spectrum processing on the retransmission scheduling request through the OCC.
14. A method for scheduling retransmission resources, comprising:
the first terminal sends data to the second terminal on a sidelink SL;
the first terminal receives a physical layer hybrid automatic repeat request (HARQ-ACK) feedback message from the second terminal, wherein the HARQ-ACK feedback message is used for indicating whether the second terminal successfully receives the data;
The first terminal determines that the data needs to be retransmitted according to the HARQ-ACK feedback message;
if the first terminal is configured with the time-frequency resource of the first uplink control information, the first terminal sends second uplink control information through the configured time-frequency resource of the first uplink control information, wherein the second uplink control information comprises a retransmission scheduling request, or the second uplink control information comprises the retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used for requesting scheduling of the time-frequency resource for retransmitting the data.
15. The method according to claim 14, wherein before the first terminal transmits second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises:
the first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring initial sequence cyclic shift and time-frequency resources for sending the first uplink control information;
the first terminal obtains a sequence cyclic shift corresponding to the second uplink control information according to the second uplink control information and a first mapping relation, wherein the first mapping relation comprises the second uplink control information and the sequence cyclic shift corresponding to the second uplink control information;
And the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the second uplink control information.
16. The method according to claim 14, wherein before the first terminal transmits second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises:
the first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring initial sequence cyclic shift, overlapping orthogonal code OCC and sending time-frequency resources of the first uplink control information;
the first terminal obtains scheduling request SR bit information corresponding to the second uplink control information according to the second uplink control information and a second mapping relationship, where the second mapping relationship includes: the second uplink control information and SR bit information corresponding to the second uplink control information;
and the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift, the OCC and SR bit information corresponding to the second uplink control information.
17. The method according to claim 14, wherein before the first terminal transmits second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises:
The first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for sending the first uplink control information;
the first terminal generates the retransmission scheduling request;
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; or the like, or, alternatively,
the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs retransmission scheduling, N is the number of time units included in a configured retransmission SR period, and N is an integer greater than 1.
18. The method according to claim 14, wherein before the first terminal transmits second uplink control information via the configured time-frequency resource of the first uplink control information, the method further comprises
The first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring initial sequence cyclic shift and time-frequency resources for sending the first uplink control information;
the first terminal determines an HARQ process number according to the HARQ-ACK feedback message, and obtains a sequence cyclic shift corresponding to the HARQ process number according to the HARQ process number and a third mapping relation, wherein the third mapping relation comprises: the HARQ process number and a sequence cyclic shift corresponding to the HARQ process number;
and the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift and the sequence cyclic shift corresponding to the HARQ process number.
19. The method according to claim 14, wherein before the first terminal transmits second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises:
the first terminal receives resource configuration from network equipment, wherein the resource configuration is used for configuring initial sequence cyclic shift, OCC and time-frequency resources for sending the first uplink control information;
the first terminal determines an HARQ process number according to the HARQ-ACK feedback message, and acquires SR bit information corresponding to the HARQ process number according to the HARQ process number and a fourth mapping relation, wherein the fourth mapping relation comprises: the HARQ process number and SR bit information corresponding to the HARQ process number;
And the first terminal generates the retransmission scheduling request according to the initial sequence cyclic shift, the OCC and SR bit information corresponding to the HARQ process number.
20. The method according to claim 14, wherein before the first terminal transmits second uplink control information through the configured time-frequency resource of the first uplink control information, the method further comprises:
the first terminal receives resource allocation from network equipment, wherein the resource allocation is used for allocating time-frequency resources for sending the first uplink control information;
the first terminal generates the retransmission scheduling request;
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; or the like, or, alternatively,
the retransmission scheduling request is a bitmap including N bits, each bit of the N bits is used to indicate whether data sent in each HARQ process of the N HARQ processes needs retransmission scheduling, N is the number of time units included in a configured retransmission SR period, N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in the SL.
21. The method according to claim 17 or 20, wherein the resource configuration is further used for configuring an OCC for feeding back the retransmission scheduling request;
after the first terminal generates the retransmission scheduling request, the method further includes: and the first terminal carries out time domain spread spectrum processing on the retransmission scheduling request through the OCC.
22. A method for scheduling retransmission resources, comprising:
the network equipment receives a retransmission scheduling request sent by a first terminal through configured time-frequency resources at a sending opportunity in a SR cycle of the retransmission scheduling request, wherein the retransmission scheduling request is used for requesting to schedule the time-frequency resources of retransmission data;
and the network equipment schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request.
23. The method of claim 22, wherein the SR retransmission period is the same as one time unit of a sidelink SL, which is a link for data transmission between the first terminal and a second terminal.
24. The method according to claim 23, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
The network equipment determines initial sequence cyclic shift according to the retransmission scheduling request, determines a terminal sending the retransmission scheduling request as the first terminal according to time-frequency resources bearing the retransmission scheduling request and the initial sequence cyclic shift, and determines data needing to be retransmitted;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
25. The method according to claim 23, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines an initial sequence cyclic shift and a superposition orthogonal code (OCC) according to the retransmission scheduling request, determines a terminal sending the retransmission scheduling request as the first terminal according to a time-frequency resource bearing the retransmission scheduling request and determines data needing to be retransmitted by the initial sequence cyclic shift and the OCC;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
26. The method of claim 22, wherein the SR retransmission period is the same as N time units of SL, where N is an integer greater than 1.
27. The method according to claim 26, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines initial sequence cyclic shift according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as the first terminal according to time-frequency resources bearing the retransmission scheduling request and the initial sequence cyclic shift;
the network equipment determines sequence cyclic shift according to the retransmission scheduling request;
the network device determines, according to the sequence cyclic shift and a first mapping relationship, a K corresponding to the sequence cyclic shift, where the K is an interval between a first time unit and the transmission opportunity, and the first mapping relationship includes: the sequence cyclic shift and K corresponding to the sequence cyclic shift, wherein the first time unit is a time unit when the first terminal receives a physical layer hybrid automatic repeat request (HARQ) -Acknowledgement (ACK) feedback message;
The network equipment determines data needing to be retransmitted according to the K;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
28. The method according to claim 26, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as the first terminal according to a time-frequency resource bearing the retransmission scheduling request;
the network equipment determines SR bit information according to the retransmission scheduling request;
the network device determines, according to the SR bit information and a second mapping relationship, K corresponding to the SR bit information, where K is an interval between the first time unit and the transmission opportunity, and the second mapping relationship includes: the SR bit information and K corresponding to the SR bit information, where the first time unit is a time unit in which the first terminal receives a HARQ-ACK feedback message;
The network equipment determines data needing to be retransmitted according to the K;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
29. The method of claim 26,
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines a terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determines data needing to be retransmitted according to the first information and the second information; the scheduling time-frequency resources for the first terminal to retransmit data includes: scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted;
Or, the retransmission scheduling request is a bitmap including N bits, where each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs to be retransmitted and scheduled; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines a terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the retransmission scheduling request or the time-frequency resource bearing the retransmission scheduling request and the OCC, and determines data needing to be retransmitted according to the bitmap; the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
30. The method of claim 26, wherein N is less than or equal to M, a positive integer, the number of HARQ processes in SL.
31. The method according to claim 30, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
The network equipment determines initial sequence cyclic shift according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as the first terminal according to time-frequency resources bearing the retransmission scheduling request and the initial sequence cyclic shift;
the network equipment determines sequence cyclic shift according to the retransmission scheduling request;
the network device determines, according to the sequence cyclic shift and a third mapping relationship, an HARQ process number corresponding to the sequence cyclic shift, where the third mapping relationship includes: the sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift;
the network equipment determines data needing to be retransmitted according to the HARQ process number;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
32. The method according to claim 30, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as the first terminal according to a time-frequency resource bearing the retransmission scheduling request;
The network equipment determines SR bit information according to the retransmission scheduling request;
the network device determines, according to the SR bit information and a fourth mapping relationship, an HARQ process number corresponding to the SR bit information, where the fourth mapping relationship includes: the SR bit information and a HARQ process number corresponding to the SR bit information;
the network equipment determines data needing to be retransmitted according to the HARQ process number;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
33. The method of claim 30,
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource bearing the retransmission scheduling request or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines, according to the first information and the second information, data that needs to be retransmitted, and schedules, for the first terminal, the time-frequency resource of retransmitted data, including: scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted;
Or, the retransmission scheduling request is a bitmap including N bits, where each bit of the N bits is used to indicate whether data transmitted in each of the N HARQ processes needs retransmission scheduling; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource bearing the retransmission scheduling request or according to the time-frequency resource bearing the retransmission scheduling request and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines, according to the bitmap, data that needs to be retransmitted, and schedules the time-frequency resource of the retransmitted data for the first terminal, including: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
34. A method for scheduling retransmission resources, comprising:
the network equipment receives second uplink control information sent by a first terminal through configured time-frequency resources of first uplink control information, wherein the second uplink control information comprises a retransmission scheduling request, or the second uplink control information comprises the retransmission scheduling request and the first uplink control information, and the retransmission scheduling request is used for requesting to schedule the time-frequency resources of retransmission data;
And the network equipment schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request.
35. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines an initial sequence cyclic shift according to the retransmission scheduling request, determines a terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the second uplink control information and the initial sequence cyclic shift, and determines data needing to be retransmitted;
the network device schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
36. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, determines a terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the second uplink control information, and determines data needing to be retransmitted;
The network device schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
37. The method of claim 34,
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time units corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the interval between the time unit of receiving the HARQ-ACK feedback message of the data needing to be retransmitted and the transmission opportunity; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines data to be retransmitted according to the first information and the second information, and determines a terminal sending the retransmission scheduling request as the first terminal according to a time-frequency resource bearing the second uplink control information or according to the time-frequency resource bearing the second uplink control information and the OCC; the network device schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method includes: scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted;
Or, the retransmission scheduling request is a bitmap including N bits, where each bit of the N bits is used to indicate whether data transmitted in a time unit corresponding to each time unit in the first N time units of the transmission opportunity needs retransmission scheduling; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network equipment determines the terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the second uplink control information or the time-frequency resource bearing the second uplink control information and the OCC, and determines the data to be retransmitted according to the bitmap; the network device schedules time-frequency resources of retransmission data for the first terminal according to the retransmission scheduling request, and the scheduling method includes: scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted;
wherein, N is the number of time units included in the configured SR cycle, and N is an integer greater than 1.
38. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
The network equipment determines an initial sequence cyclic shift according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the second uplink control information and the initial sequence cyclic shift;
the network equipment determines sequence cyclic shift according to the retransmission scheduling request;
the network device determines, according to the sequence cyclic shift and a third mapping relationship, an HARQ process number corresponding to the sequence cyclic shift, where the third mapping relationship includes: the sequence cyclic shift and a HARQ process number corresponding to the sequence cyclic shift;
the network equipment determines data needing to be retransmitted according to the HARQ process number;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
39. The method according to claim 34, wherein before the network device schedules time-frequency resources for retransmission data for the first terminal according to the retransmission scheduling request, the method further comprises:
the network equipment determines an initial sequence cyclic shift and an OCC according to the retransmission scheduling request, and determines a terminal sending the retransmission scheduling request as the first terminal according to the time-frequency resource bearing the second uplink control information;
The network equipment determines SR bit information according to the retransmission scheduling request;
the network device determines, according to the SR bit information and a fourth mapping relationship, an HARQ process number corresponding to the SR bit information, where the fourth mapping relationship includes: the SR bit information and a HARQ process number corresponding to the SR bit information;
the network equipment determines data needing to be retransmitted according to the HARQ process number;
the scheduling time-frequency resources for the first terminal to retransmit data includes: and scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted.
40. The method of claim 34,
the retransmission scheduling request comprises first information and second information, the first information is used for indicating the number of data needing to be retransmitted in the data transmitted in the time unit corresponding to the first N time units of the transmission opportunity, and the second information is used for indicating the HARQ process number of the data needing to be retransmitted; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines, according to the first information and the second information, data that needs to be retransmitted, and schedules, for the first terminal, the time-frequency resource for retransmitting the data, including: scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted;
Or, the retransmission scheduling request is a bitmap including N bits, where each bit of the N bits is used to indicate whether data transmitted in each of the N HARQ processes needs retransmission scheduling; before the network device schedules a time-frequency resource of retransmission data for the first terminal according to the retransmission scheduling request, the method further includes: the network device determines, according to the time-frequency resource carrying the second uplink control information or according to the time-frequency resource carrying the second uplink control information and the OCC, that the terminal sending the retransmission scheduling request is the first terminal, determines, according to the bitmap, data to be retransmitted, and schedules, for the first terminal, the time-frequency resource for retransmitting the data, including: scheduling time-frequency resources for the first terminal according to the data needing to be retransmitted;
where N is an integer greater than 1 and less than or equal to M, and M is the number of HARQ processes in the sidelink SL.
41. A communication apparatus, wherein the communication apparatus is a terminal or a chip in the terminal or a system on chip in the terminal; the communication device comprises a processor and a memory;
The memory is configured to store computer-executable instructions that, when executed by the processor, cause the communication device to perform the method of scheduling retransmission resources of any of claims 1-21.
42. A communication apparatus, wherein the communication apparatus is a network device or a chip in the network device or a system on chip in the network device;
the communication device comprises a processor and a memory; the memory is configured to store computer-executable instructions that, when executed by the processor, cause the communication device to perform the method of scheduling of retransmission resources of any of claims 22-40.
43. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the method of scheduling retransmission resources of any of claims 1-21.
44. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the method of scheduling of retransmission resources of any of claims 22-40.
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