CN113271182A

CN113271182A - Method and equipment for determining straight-through link process

Info

Publication number: CN113271182A
Application number: CN202010093950.9A
Authority: CN
Inventors: 张轶; 夏亮; 王启星; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2021-08-17
Anticipated expiration: 2040-02-14
Also published as: CN113271182B; WO2021160112A1

Abstract

A method and device for determining a through link process are provided, the method comprises: receiving a first direct link (SL) authorization sent by a network on a physical layer downlink control channel (PDCCH); and if the first SL authorization indicates retransmission, determining at least one SL process associated with the first SL authorization. The invention can determine the straight-through link process associated with retransmission authorization, thereby being used for guiding the retransmission of the straight-through link.

Description

Method and equipment for determining straight-through link process

Technical Field

The invention relates to the technical field of mobile communication, in particular to a method and equipment for determining a straight-through link process.

Background

The New air interface (NR, New Radio) V2X system supports two resource allocation methods: resource allocation Mode 1(Mode-1) and resource allocation Mode 2 (Mode-2). Wherein the content of the first and second substances,

resource allocation Mode-1: a resource allocation mode controlled by a base station, that is, the base station schedules a direct link (SL) resource through RRC configuration and/or DCI, a V2X sending end sends a data packet on the resource scheduled by the base station, where the data packet includes direct link Control information (SCI) and data, the SCI is carried on a Physical direct link Control Channel (PSCCH) and a Physical direct link Shared Channel (PSCCH), and the data is carried on the PSCCH;

resource allocation Mode-2: the UE autonomously adopts a resource allocation mode, that is, when a V2X sending end has a data packet to send, resource selection is performed through self sensing (sensing), and the data packet is sent on the selected sidelink resource, including SCI and data, where the SCI is carried on the PSCCH and PSCCH, and the data is carried on the PSCCH.

For the resource allocation Mode-1, three scheduling manners of dynamic grant (dynamic grant) and configuration grant (configured grant, specifically including type 1type-1 and type-2) are supported, wherein the dynamic grant can only schedule one Transport Block (TB) at a time, the configured grant (type-1, type-2) periodically allocates a series of resources for the terminal to the base station, and which TB is transmitted on the series of resources is determined by the terminal itself. In this document, a configured grant (configured grant) is sometimes also referred to as a configured SL grant.

Specifically, when the resource allocation Mode-1 is adopted:

for the dynamic grant, Downlink Control Information (DCI) sent by the base station includes a Hybrid Automatic Repeat reQuest (HARQ) identifier, that is, an HARQ ID, and a New Data Indicator (NDI), and indicates available sidelink time domain and frequency domain resources in the DCI;

for configured grant type-1, periodically available sidelink time and frequency domain resources are indicated by a base station through Radio Resource Control (RRC) signaling;

for configured grant type-2, periodically available sidelink time and frequency domain resources are indicated for the base station through RRC signaling and activation/deactivation DCI.

In addition, in order to improve the Sidelink spectrum efficiency, the receiving terminal (receiver) is supported to feed back the SL HARQ-ACK (direct link Feedback Control Information) to the transmitting terminal (transmitter), the SL HARQ-ACK is carried on a Physical direct link Feedback channel (PSFCH), the model-1 is allocated to the V2X resource, the transmitter is supported to send the received SL HARQ-ACK to the base station, and the base station is assisted to perform retransmission scheduling. Whether for the dynamic grant or the configured grant (type-1, type-2), if the base station receives the SL NACK, the SL retransmission resources can be scheduled through the dynamic grant, wherein the interpretation manner of the NDI is the same as that of the Uu port:

-when the initial transmission is dynamic grant scheduling, a Cyclic Redundancy Check (CRC) of the dynamic grant for scheduling retransmissions is scrambled using an RNTI of the DCI for dynamic SL grant (SL RNTI in reduced for DCI for a dynamic grant);

-when the initial transmission is a configured grant scheduling, the CRC of the dynamic grant for scheduling the retransmission is scrambled using the RNTI (SL RNTI in transmitted for DCI for a configured SL grant type-2) of the DCI for the configured SL grant;

-for configured grant, one PUCCH transmission 1-bit HARQ-ACK is supported after a series of resources.

Disclosure of Invention

At least one embodiment of the present invention provides a method and an apparatus for determining a direct link process, which can determine a direct link process associated with a retransmission authorization, so as to guide retransmission of a direct link.

According to an aspect of the present invention, at least one embodiment provides a method for determining a direct link process, which is applied to a terminal, and includes:

receiving a first direct link (SL) authorization sent by a network on a physical layer downlink control channel (PDCCH);

and if the first SL authorization indicates retransmission, determining at least one SL process associated with the first SL authorization.

According to at least one embodiment of the present invention, determining at least one SL process associated with the first SL grant comprises:

if the first SL grant is a SL grant for a first RNTI of the MAC entity and new data indicating NDI included in the first SL grant is not inverted compared with NDI included in HARQ information for the first HARQ process number received last before the first SL grant, taking the first SL resource or the SL process corresponding to the initial transmission of the SL as the at least one SL process, or taking the SL process corresponding to the first HARQ process number as the at least one SL process;

alternatively, the first and second electrodes may be,

if the first SL grant is a SL grant for a second RNTI of the MAC entity and the PDCCH content indicates retransmission of an activated configured sidelink grant, one or more of a second SL resource or a SL process corresponding to initial transmission of the SL is used as the at least one SL process, or one or more of SL processes corresponding to a first HARQ process number included in the first SL grant is used as the at least one SL process.

According to at least one embodiment of the invention, the first SL resource is any one of the following resources:

the resource occupied by SL initial transmission or the occupied PSCCH duration(s) and PSSCH duration(s) of the PSSCH;

a resource indicated by the SL grant/PDCCH including the first HARQ process number received last before the first SL grant, or PSCCH duration(s) and PSCCH duration(s) during PSCCH;

the second SL resource is any one of the following resources:

SL resources corresponding to the first HARQ process number, or PSCCH duration(s) and PSCCH duration(s) during PSCCH.

According to at least one embodiment of the present invention, one or more of the SL processes corresponding to the second SL resource are taken as the at least one SL process in at least one of the following manners:

the first method is as follows: determining one or more SL processes corresponding to the second SL resource as the at least one SL process in a terminal self-determination mode;

the second method comprises the following steps: determining one or more SL processes corresponding to the second SL resource as the at least one SL process according to the received at least one physical straight-through link feedback channel PSFCH;

the third method comprises the following steps: and determining one or more SL processes corresponding to the second SL resource as the at least one SL process according to the priority of the PSSCH.

According to at least one embodiment of the present invention, when the first and second modes are adopted, the first number of SL processes is determined according to the second mode; and autonomously determining a second number of SL processes from the first number of SL processes according to the first mode;

when the first mode and the third mode are adopted, determining a third number of SL processes according to the third mode; and autonomously determining a fourth number of SL processes from the third number of SL processes according to the first mode;

when the second mode and the third mode are adopted, determining a fifth number of SL processes according to the second mode; and determining a sixth number of SL processes from the fifth number of SL processes according to the third manner;

when the first mode, the second mode and the third mode are adopted, determining a seventh number of SL processes according to the second mode; and determining an eighth number of SL processes from the seventh number of SL processes according to the third manner; and autonomously determining a ninth number of SL processes from the eighth number of SL processes according to the first mode.

According to at least one embodiment of the present invention, one or more of the SL processes corresponding to the first HARQ process number contained in the first SL grant are taken as the at least one SL process in at least one of the following manners:

the method is as follows: determining one or more SL processes corresponding to a first HARQ process number contained in the first SL authorization as the at least one SL process by a terminal self-determination mode;

the fifth mode is as follows: determining one or more SL processes corresponding to a first HARQ process number contained in the first SL authorization as the at least one SL process according to the received PSFCH;

the method six: and determining one or more SL processes corresponding to the first HARQ process number contained in the first SL authorization as the at least one SL process according to the priority of the PSSCH.

According to at least one embodiment of the present invention, when the fourth and fifth modes are adopted, a tenth number of SL processes is determined according to the fifth mode; and according to the fourth mode, autonomously determining an eleventh number of SL processes from the tenth number of SL processes;

when the fourth mode and the sixth mode are adopted, determining a twelfth number of SL processes according to the sixth mode; and, according to the fourth mode, autonomously determining a thirteenth number of SL processes from the twelfth number of SL processes;

when the fifth mode and the sixth mode are adopted, determining a fourteenth number of SL processes according to the fifth mode; and determining a fifteenth number of SL processes from the fourteenth number of SL processes according to the sixth mode;

when the fourth mode, the fifth mode and the sixth mode are adopted, determining a sixteenth number of SL processes according to the fifth mode; and determining a seventeenth number of SL processes from the sixteenth number of SL processes according to the sixth manner; and according to a fourth mode, autonomously determining an eighteenth number of SL processes from the seventeenth number of SL processes.

According to at least one embodiment of the invention, before the step of determining at least one SL process associated with the first SL grant, the method further comprises:

and determining retransmission resources of the MAC PDU corresponding to the at least one SL process by using the received first SL authorization.

According to at least one embodiment of the present invention, when any one of the following conditions is satisfied, determining retransmission resources of a MAC PDU corresponding to the at least one SL process using the received first SL grant:

the first SL authorization is an SL authorization aiming at a first Radio Network Temporary Identifier (RNTI) of a Media Access Control (MAC) entity, and first new data contained in the first SL authorization indicates an NDI (non-inverted index) which is not inverted compared with a second NDI contained in HARQ information which is received last before the first SL authorization and aims at a first HARQ process number;

alternatively, the first and second electrodes may be,

the first SL grant is a SL grant for a second RNTI of the MAC entity, and the first SL grant indicates a retransmission of the configured SL grant configured to be activated.

According to another aspect of the present invention, at least one embodiment provides a terminal including:

a receiving module, configured to receive a first direct link SL grant sent by a network on a physical layer downlink control channel PDCCH;

a determining module, configured to determine at least one SL process associated with the first SL grant if the first SL grant indicates retransmission.

According to at least one embodiment of the invention, the determining module is further configured to:

alternatively, the first and second electrodes may be,

the resource occupied by SL initial transmission or the occupied PSCCH period and PSSCH period;

a resource indicated by the SL grant/PDCCH including the first HARQ process number, which is received last before the first SL grant, or a PSCCH period and a PSCCH period;

the second SL resource is any one of the following resources:

SL resources corresponding to the first HARQ process number, or PSCCH period and PSCCH period.

and taking one or more of the SL processes corresponding to the second SL resource as the at least one SL process according to at least one of the following modes:

when the first mode and the second mode are adopted, determining a first number of SL processes according to the second mode; and autonomously determining a second number of SL processes from the first number of SL processes according to the first mode;

taking one or more of the SL processes corresponding to the first HARQ process number contained in the first SL grant as the at least one SL process according to at least one of the following manners:

when the fourth and fifth modes are adopted, determining a tenth number of SL processes according to the fifth mode; and according to the fourth mode, autonomously determining an eleventh number of SL processes from the tenth number of SL processes;

According to at least one embodiment of the present invention, the terminal further includes:

and a resource determining module, configured to determine, before determining the at least one SL process associated with the first SL grant, retransmission resources of the MAC PDU corresponding to the at least one SL process using the received first SL grant.

According to at least one embodiment of the present invention, the resource determining module is further configured to determine retransmission resources of a MAC PDU corresponding to the at least one SL process by using the received first SL grant when any one of the following conditions is satisfied:

alternatively, the first and second electrodes may be,

In accordance with another aspect of the present invention, at least one embodiment provides a terminal comprising a transceiver and a processor, wherein,

the transceiver is used for receiving a first direct link (SL) authorization sent by a network on a physical layer downlink control channel (PDCCH);

the processor is configured to determine at least one SL process associated with the first SL grant if the first SL grant indicates retransmission.

According to another aspect of the present invention, at least one embodiment provides a terminal comprising a processor, a memory, and a program stored on the memory and executable on the processor, the program implementing the steps of the method for determining a through-link procedure as described above when executed by the processor.

According to another aspect of the invention, at least one embodiment provides a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of the method as described above.

Compared with the prior art, the method and the device for determining the straight-through link process provided by the embodiment of the invention can determine the straight-through link process associated with retransmission authorization, so that the method and the device can be used for guiding the retransmission of the straight-through link. In addition, the embodiment of the present invention may also determine the SL process ID corresponding to the HARQ ID of the first SL grant through the mapping relationship between the HARQ ID and the SL transmission resource/transmission opportunity included in the first SL grant and the priority of the PSFCH and/or the PSSCH received by the terminal, thereby providing support for SL retransmission.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic view of an application scenario according to an embodiment of the present invention;

fig. 2 is a flowchart of a method for determining a through link process according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 4 is another schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

The techniques described herein are not limited to NR systems and Long Time Evolution (LTE)/LTE Evolution (LTE-a) systems, and may also be used for various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.21(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation Partnership Project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.

The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

Referring to fig. 1, fig. 1 is a block diagram of a wireless communication system to which an embodiment of the present invention is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may also be referred to as a User terminal or a User Equipment (UE), where the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 11 is not limited in the embodiment of the present invention. The network device 12 may be a Base Station and/or a core network element, wherein the Base Station may be a 5G or later-version Base Station (e.g., a gNB, a 5G NR NB, etc.), or a Base Station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), wherein the Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, it should be noted that, in the embodiment of the present invention only takes the Base Station in the NR system as an example, but does not limit the specific type of base station.

The base stations may communicate with the terminals 11 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of the base stations may communicate with each other, directly or indirectly, over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.

The base station may communicate wirelessly with the terminal 11 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be divided into sectors that form only a portion of the coverage area. A wireless communication system may include different types of base stations (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.

The communication links in a wireless communication system may comprise an Uplink for carrying Uplink (UL) transmissions (e.g., from terminal 11 to network device 12) or a Downlink for carrying Downlink (DL) transmissions (e.g., from network device 12 to terminal 11). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.

In the NR V2X system supporting resource allocation Mode-1, the HARQ ID included in the DCI sent by the base station and the SL process ID (SL process ID) in the SL HARQ entity are different concepts for the dynamic grant or the configured grant. Only some resources or some SL transmissions are indicated by HARQ IDs in the DCI. Therefore, when a terminal receives DCI issued by a base station to schedule retransmission of a certain HARQ ID, it needs to identify which SL process IDs correspond to on sidelink;

for configured grant (type-1, type-2), the base station periodically allocates a set of transmission resources/transmission opportunities, but it is determined whether the same TB or different TBs are transmitted on these transmission resources/transmission opportunities to the same receiving end or different receiving ends by the transmitting terminal itself. For the configured grant, after a set of resources that periodically appear, only 1-bit HARQ-ACK is sent, if the base station receives NACK, it cannot be distinguished which TB was transmitted by the V2X at all, and the V2X sending end cannot know which TB is retransmitted on the scheduling resources after receiving the retransmission grant sent by the base station.

In order to solve at least one of the above problems, an embodiment of the present invention provides a method for determining a direct link process, which can identify a direct link process associated with a retransmission authorization for guiding retransmission of a direct link. Referring to fig. 2, a method for determining a direct link procedure provided in an embodiment of the present invention is applied to a terminal, and includes:

step 21, receiving a first SL grant sent by the network on the PDCCH.

Step 22, if the first SL grant indicates retransmission, determining at least one SL process associated with the first SL grant.

Through the above steps, after receiving a SL grant (for convenience of description, referred to as a first SL grant) indicating retransmission, the terminal identifies at least one SL process associated with the first SL grant, and thus can be used to provide relevant information for SL retransmission.

According to at least one embodiment of the present invention, before step 22, after the terminal receives the first SL grant, the terminal may determine the retransmission resource of the MAC PDU corresponding to the at least one SL process by using the received first SL grant.

According to at least one embodiment of the present invention, before step 22, after the terminal receives the first SL grant, it may be determined whether the first SL grant is an SL grant indicating retransmission according to the following manner:

1) if the first SL grant is a SL grant for a first RNTI of a MAC entity and a first NDI included in the first SL grant is not inverted compared with a second NDI included in HARQ information for a first HARQ process number received last before the first SL grant, it indicates that the first SL grant is a SL grant indicating retransmission, and at this time, retransmission resources of a MAC PDU corresponding to the at least one SL process are determined by using the received first SL grant.

Here, the first HARQ process number is a HARQ process number included in the first SL grant. The retransmission resource of the MAC PDU corresponding to the at least one SL process may specifically be a PSCCH duration(s) and a PSCCH duration(s). The first RNTI is sometimes also referred to as an RNTI (SL RNTI in transmitted for DCI for a dynamic grant) for a DCI for a dynamic SL grant.

2) If the first SL grant is a SL grant for the second RNTI of the MAC entity and the PDCCH content indicates retransmission of an activated configured SL grant (configured downlink grant), it indicates that the first SL grant is the SL grant indicating retransmission, and at this time, the received first SL grant is used to determine retransmission resources of the MAC PDU corresponding to the at least one SL process.

Here, the retransmission resource of the MAC PDU corresponding to the at least one SL process may be PSCCH duration(s) and PSCCH duration(s). The second RNTI is also sometimes referred to as an RNTI (SL RNTI in transmitted for DCI for a configured grant type-2) for configured SL grant.

In the embodiment of the present invention, when identifying at least one SL process associated with the first SL authorization in step 21, the method specifically includes:

1) if the first SL grant is a SL grant for a first RNTI of the MAC entity, and the new data indication NDI included in the first SL grant is not inverted compared with the NDI included in the HARQ information for the HARQ process number received most recently before the first SL grant, the SL process corresponding to the first SL resource or the first SL initial transmission is used as the at least one SL process, or the SL process corresponding to the first HARQ process number is used as the at least one SL process.

Here, the SL process corresponding to the first SL resource, or the SL process corresponding to the SL initial transmission, or the SL process corresponding to the first HARQ process number is used as the at least one SL process. The first SL resource may specifically be any one of the following resources:

A) the resources occupied by the SL initial transmission, or the occupied PSCCH period and PSCCH period (PSCCH duration (s)) are used.

B) The resource indicated by the SL grant/PDCCH including the first HARQ process number received the last time before the first SL grant, or the PSCCH period and the PSCCH period. That is, the resource indicated by the SL grant/PDCCH including the first HARQ process number received before the first SL grant, or the PSCCH duration(s) and PSCCH duration(s) indicated by the SL grant/PDCCH including the first HARQ process number received before the first SL grant.

In addition, when the SL process corresponding to the first HARQ process number is taken as the at least one SL process, a mapping relationship between the HARQ process number and first information may be established in advance, where the first information specifically may include a SL process number (SL process ID), a resource identifier (source ID), and a destination ID. The destination ID may be represented by a sink ID. And then, according to the mapping relation, determining the SL process corresponding to the first HARQ process number.

2) If the first SL grant is a SL grant for a second RNTI of the MAC entity and the PDCCH content indicates retransmission of an activated configured sidelink grant, one or more of a second SL resource or a SL process corresponding to initial transmission of the SL is used as the at least one SL process, or one or more of SL processes corresponding to a first HARQ process number included in the first SL grant is used as the at least one SL process.

Here, one or more of the SL processes corresponding to the second SL resource, or one or more of the SL processes corresponding to the SL initial transmission, or one or more of the SL processes corresponding to the first HARQ process number are used as the at least one SL process. The second SL resource may specifically be any one of the following resources:

B) SL resources corresponding to the first HARQ process number, or PSCCH period and PSCCH period. That is, the SL resource corresponding to the first HARQ process number, or the PSCCH duration(s) and PSCCH duration(s) corresponding to the first HARQ process number.

In the case that the first SL grant is a SL grant for a second RNTI of the MAC entity, and the PDCCH content indicates a retransmission of an activated configured sidelink grant, the embodiment of the present invention further provides multiple identification manners, identifying at least one SL process associated with the first SL grant, and multiple manners are provided below.

For example, the terminal may regard one or more of the SL processes corresponding to the second SL resource as the at least one SL process in at least one of the following manners:

the first method is as follows: and determining one or more SL processes corresponding to the second SL resource as the at least one SL process in a terminal self-determination mode.

Here, in the first mode, the terminal autonomously determines, for example, the terminal may arbitrarily select one or more of the SL processes corresponding to the second SL resource as the at least one SL process.

The second method comprises the following steps: and determining one or more SL processes corresponding to the second SL resource as the at least one SL process according to the received at least one physical straight-through link feedback channel PSFCH.

Here, when the determination is performed based on the PSFCH in the second embodiment, the following may be performed: and according to the feedback information (such as SL HARQ-ACK) on the PSFCH, selecting the resources failed to be sent in the second SL resources, and taking one or more SL processes corresponding to the selected resources as the at least one SL process.

For example, the base station periodically allocates N SL transmission resources/SL transmission opportunities through a configured grant, the sending end transmits M TBs on the N SL transmission resources/SL transmission opportunities in total, and receives N PSFCH/N HARQ-ACKs fed back by the receiving end, where only the PSFCH corresponding to the ith SL transmission resource/SL transmission opportunity (i ═ 1,2.. N) carries NACK, and the PSFCH corresponding to the remaining N-1 SL transmission resources/SL transmission opportunities carries ACK, and the terminal determines, according to the received PSFCH(s), that the sidelink process(s) associated with the first SL grant is the sidelink process corresponding to the ith SL transmission resource/SL transmission opportunity;

Here, in the third embodiment, when determining according to the priority of the psch, the following may be used: and selecting one or more resources with the priority level higher than the first priority level from the second SL resources according to the high-low order of the priority level of the PSSCH, and taking the SL process corresponding to the selected resources as the at least one SL process.

For example, the base station periodically allocates N SL transmission resources/SL transmission opportunities through configured grant, the sending end co-transmits M TB/MAC PDUs on the N SL transmission resources/SL transmission opportunities, and the terminal receives a retransmission first SL grant, and determines that sidelink processes(s) associated with the first SL grant are sidelink processes(s) corresponding to MAC PDUs corresponding to the highest X (X is less than or equal to M) SL logical channel priorities according to the highest SL logical channel priority included in the M MAC PDUs.

In the following, a plurality of manners including one to three manners are provided, and one or more of the SL processes corresponding to the second SL resource are taken as several examples of the at least one SL process:

1) when the first mode and the second mode are adopted, determining a first number of SL processes according to the second mode; and autonomously determining a second number of SL processes from the first number of SL processes according to the first mode. Here, the first number is greater than or equal to the second number.

2) When the first mode and the third mode are adopted, determining a third number of SL processes according to the third mode; and autonomously determining a fourth number of SL processes from the third number of SL processes according to the first mode. Here, the third number is greater than or equal to the fourth number.

3) When the second mode and the third mode are adopted, determining a fifth number of SL processes according to the second mode; and determining a sixth number of SL processes from the fifth number of SL processes according to the third manner. Here, the fifth number is greater than or equal to the sixth number.

4) When the first mode, the second mode and the third mode are adopted, determining a seventh number of SL processes according to the second mode; and determining an eighth number of SL processes from the seventh number of SL processes according to the third manner; and autonomously determining a ninth number of SL processes from the eighth number of SL processes according to the first mode. Here, the seventh number is greater than or equal to the eighth number, and the eighth number is greater than or equal to the ninth number.

For another example, the terminal may use one or more of the SL processes corresponding to the first HARQ process number included in the first SL grant as the at least one SL process according to at least one of the following manners:

In the following, a plurality of manners of the fourth to the sixth manners are provided, and several examples of the at least one SL process are given by taking one or more of the SL processes corresponding to the first HARQ process number included in the first SL grant:

1) when the fourth and fifth modes are adopted, determining a tenth number of SL processes according to the fifth mode; and according to the fourth mode, autonomously determining an eleventh number of SL processes from the tenth number of SL processes. Here, the tenth number is greater than or equal to eleven.

2) When the fourth mode and the sixth mode are adopted, determining a twelfth number of SL processes according to the sixth mode; and according to the fourth mode, autonomously determining a thirteenth number of SL processes from the twelfth number of SL processes. Here, the twelfth number is greater than or equal to the thirteenth number.

3) When the fifth mode and the sixth mode are adopted, determining a fourteenth number of SL processes according to the fifth mode; and determining a fifteenth number of SL processes from the fourteenth number of SL processes in the sixth manner. Here, the fourteenth number is greater than or equal to the fifteenth number.

4) When the fourth mode, the fifth mode and the sixth mode are adopted, determining a sixteenth number of SL processes according to the fifth mode; and determining a seventeenth number of SL processes from the sixteenth number of SL processes according to the sixth manner; and according to a fourth mode, autonomously determining an eighteenth number of SL processes from the seventeenth number of SL processes. Here, the sixteenth number is greater than or equal to the seventeenth number, and the seventeenth number is greater than or equal to the eighteenth number.

In addition, in the fourth to sixth modes, when determining one or more SL processes corresponding to the first HARQ process number included in the first SL grant, an embodiment of the present invention may pre-establish a mapping relationship between the HARQ process number and first information, where the first information specifically may include a SL process number (SL process ID), a resource identifier (source ID), and a destination ID. The destination ID may be represented by a sink ID. And then, according to the mapping relation, determining the SL process corresponding to the first HARQ process number.

As can be seen from the above description, the method for determining a direct link process according to the embodiment of the present invention may determine, through the mapping relationship between the HARQ ID contained in the first SL grant and the SL transmission resource/transmission opportunity, and the priority of the PSFCH and/or PSSCH received by the terminal, the SL process ID corresponding to the HARQ ID of the first SL grant, thereby providing support for SL retransmission.

According to another embodiment of the present invention, the method for determining a direct link process according to the embodiment of the present invention may specifically include the following steps when executed at a terminal side:

a) the terminal receives a first SL authorization, and the first SL authorization is supposed to contain a first HARQ process number;

b) if the NDI contained in the first SL grant is not flipped compared with the NDI contained in the SL grant corresponding to the same HARQ ID (i.e. the first HARQ process number) before, the first SL grant is used for scheduling SL retransmission;

c) identifying an SL process number (sidelink process ID) corresponding to the first SL grant if the first SL grant schedules SL retransmission

Here, if the CRC of the first SL grant is scrambled by the SL RNTI (i.e., the first RNTI of the preamble), which indicates that the initial transmission corresponding to the retransmission of the first SL grant scheduling is dynamic scheduling, the sidelink process corresponding to the first SL grant is the sidelink process corresponding to the PSCCH duration(s) and PSCCH duration(s) occupied by the SL initial transmission. Or the sidelink process corresponding to the first SL authorization is the sidelink process corresponding to the SL initial transmission;

if the CRC of the first SL grant is scrambled by the SL cs-RNTI (i.e., the second RNTI of the preamble), it indicates that the initial transmission corresponding to the retransmission scheduled by the first SL grant is configured grant scheduling, and the sidelink process corresponding to the first SL grant is one or more of the sidelink processes(s) corresponding to the PSCCH duration(s) and PSCCH duration(s) occupied by the SL initial transmission; or the sidelink process corresponding to the first SL authorization is one or more of sidelink processes corresponding to the SL initial transmission, and specifically, the determination may be performed in any one or more of the following three ways:

(1) the terminal can determine the sidelink process associated with the first SL authorization as one or more sidelink processes(s) corresponding to the PSCCH and pscsch processes(s) occupied by the SL initial transmission in an autonomous implementation manner; or determining the sidelink process associated with the first SL authorization as one or more sidelink processes corresponding to the initial transmission of the SL in a terminal self-implementation manner.

(2) The terminal may determine, according to the received psfch(s), that one or more of sidelink processes(s) corresponding to PSCCH duration(s) and PSCCH duration(s) occupied by the SL initial transmission are associated with the first SL grant; or the terminal determines the sidelink process associated with the first SL authorization as one or more sidelink processes corresponding to the SL initial transmission according to the received PSFCH(s).

(3) The terminal may determine, according to priorities of different pschs(s), that the sidelink process associated with the first SL grant is one or more of PSCCH duration(s) occupied by the SL initial transmission and sidelink processes(s) corresponding to the PSCCH duration(s); or, the terminal may determine, according to priorities of different psschs(s), that the sidelink process associated with the first SL authorization is one or more sidelink processes corresponding to the initial transmission of the SL;

d) transmitting the first SL authorization to an associated SL process (sidelink process) according to the SL process number associated with the first SL authorization;

e) and indicating the associated SL process (sidelink process) to retransmit according to the first SL authorization.

Several examples of identifying at least one SL process associated with a first SL grant are provided below:

example 1:

if the NDI included in the first SL grant is not inverted compared with the NDI included in the SL grant corresponding to the same HARQ ID, and the CRC of the first SL grant is scrambled by an SL RNTI (first RNTI), the initial transmission corresponding to the retransmission of the first SL grant is dynamic scheduling, and at this time, the sidelink process associated with the first SL grant is a sidelink process corresponding to a PSCCH duration(s) and a pscsch duration(s) occupied by the SL initial transmission; or the sidelink process associated with the first SL authorization is the sidelink process corresponding to the SL initial transmission;

example 2:

if the NDI included in the first SL grant is not inverted compared with the NDI included in the SL grant corresponding to the same HARQ ID, and the CRC of the first SL grant is scrambled by the SL cs-RNTI (second RNTI), it indicates that the initial transmission corresponding to the retransmission of the first SL grant schedule is configured grant scheduling, and the sidelink processes(s) associated with the first SL grant are one or more of PSCCH duration(s) occupied by the SL initial transmission and sidelink processes(s) corresponding to the PSCCH duration(s); or the sidelink processes(s) associated with the first SL authorization are one or more of sidelink processes(s) corresponding to SL initial transmission.

Various methods of embodiments of the present invention have been described above. An apparatus for carrying out the above method is further provided below.

Referring to fig. 3, an embodiment of the present invention provides a terminal 30, including:

a receiving module 31, configured to receive a first direct link SL grant sent by a network on a physical layer downlink control channel PDCCH;

a determining module 32, configured to determine at least one SL process associated with the first SL grant if the first SL grant indicates retransmission.

Optionally, the determining module is further configured to:

alternatively, the first and second electrodes may be,

Optionally, the first SL resource is any one of the following resources:

the second SL resource is any one of the following resources:

Optionally, the determining module is further configured to:

Optionally, the terminal further includes:

and a resource determining module, configured to determine, before identifying the at least one SL process associated with the first SL grant, retransmission resources of the MAC PDU corresponding to the at least one SL process using the received first SL grant.

Optionally, the resource determining module is further configured to determine retransmission resources of the MAC PDU corresponding to the at least one SL process by using the received first SL grant when any of the following conditions is met:

alternatively, the first and second electrodes may be,

It should be noted that the terminal embodiment is an apparatus corresponding to the above method embodiment, and all implementation manners in the above method embodiment are applicable to the terminal embodiment, and the same or similar technical effects can also be achieved.

Referring to fig. 4, a schematic structural diagram of a terminal according to an embodiment of the present invention is shown, where the terminal 400 includes: a processor 401, a transceiver 402, a memory 403, a user interface 404 and a bus interface.

In the embodiment of the present invention, the terminal 400 further includes: a program stored in memory 403 and executable on processor 401.

The processor 401, when executing the program, implements the following steps:

It can be understood that, in the embodiment of the present invention, when being executed by the processor 401, the computer program can implement each process of the embodiment of the method for determining a direct link process shown in fig. 2, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.

In FIG. 4, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 401, and various circuits, represented by memory 403, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 402 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 404 may also be an interface capable of interfacing with a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 401 is responsible for managing the bus architecture and general processing, and the memory 403 may store data used by the processor 401 in performing operations.

In some embodiments of the invention, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of:

When being executed by a processor, the program can realize all the implementation manners in the method for determining the straight-through link process, and can achieve the same technical effect, and the details are not repeated here in order to avoid repetition.

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

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

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

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

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

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

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

Claims

1. A method for determining a straight-through link process is applied to a terminal, and is characterized by comprising the following steps:

2. The method of claim 1, wherein determining at least one SL process associated with the first SL authorization comprises:

alternatively, the first and second electrodes may be,

3. The method of claim 2,

the first SL resource is any one of the following resources:

the second SL resource is any one of the following resources:

4. The method of claim 3, wherein one or more of the SL processes corresponding to the second SL resource are taken as the at least one SL process in at least one of the following manners:

5. The method of claim 4,

6. The method of claim 3, wherein one or more of the SL processes corresponding to the first HARQ process number contained in the first SL grant are used as the at least one SL process in at least one of the following manners:

7. The method of claim 6,

8. The method of claim 1, wherein prior to the step of determining at least one SL process associated with the first SL authorization, the method further comprises:

9. The method of claim 8, wherein the retransmission resources of the MAC PDU corresponding to the at least one SL process are determined using the received first SL grant when any of the following conditions is met:

alternatively, the first and second electrodes may be,

10. A terminal, comprising:

11. The terminal of claim 10, wherein the determining module is further configured to:

alternatively, the first and second electrodes may be,

12. The terminal of claim 11,

the first SL resource is any one of the following resources:

the second SL resource is any one of the following resources:

13. The terminal of claim 12, wherein the determining module is further configured to:

14. The terminal of claim 13, wherein the determining module is further configured to:

15. The terminal of claim 12, wherein the determining module is further configured to:

16. The terminal of claim 15, wherein the determining module is further configured to:

17. The terminal of claim 10, further comprising:

18. The terminal of claim 17,

the resource determining module is further configured to determine retransmission resources of the MAC PDU corresponding to the at least one SL process by using the received first SL grant when any one of the following conditions is satisfied:

alternatively, the first and second electrodes may be,

19. A terminal comprising a transceiver and a processor, wherein,

20. A terminal, comprising: processor, memory and program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the method of determining a through link procedure according to any of claims 1 to 9.

21. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of determining a through-link procedure according to any one of claims 1 to 9.