CN-116210187-B - Method and device for retransmitting in side link communication

CN116210187BCN 116210187 BCN116210187 BCN 116210187BCN-116210187-B

Abstract

The invention discloses a method and a device for retransmitting in side link communication. A method of operating a transmitting terminal includes transmitting first data to a receiving terminal based on a first retransmission scheme, switching the retransmission scheme from the first retransmission scheme to a second retransmission scheme when a preset condition is satisfied, and transmitting second data to the receiving terminal based on the second retransmission scheme.

Inventors

Sun Gemin
HAN ZHENBAI
ZHENG RENYONG

Assignees

现代自动车株式会社
起亚株式会社
圆光大学校产学协力团

Dates

Publication Date: 20260508
Application Date: 20210706
Priority Date: 20200717

Claims (11)

1. A method of operating a transmitting terminal in a communication system, comprising: Transmitting first data to a receiving terminal based on a first retransmission scheme; Switching a retransmission scheme from the first retransmission scheme to a second retransmission scheme based on a result of comparing a channel occupancy state between the transmitting terminal and the receiving terminal with a pre-configured reference value; Transmitting first level side link control information, i.e., first level SCI, to the receiving terminal, the first level SCI including a first indicator indicating switching of the retransmission scheme, resource allocation information indicating new resources allocated for the second retransmission scheme as a new retransmission scheme, and resource release information indicating release of resources allocated for the first retransmission scheme as a previous retransmission scheme, and resource release information Based on the second retransmission scheme, transmitting second data to the receiving terminal using the resources indicated by the resource allocation information, Wherein the first retransmission scheme and the second retransmission scheme are distinguished according to whether a hybrid automatic repeat request, HARQ, feedback is transmitted.
2. The method of operation of claim 1, further comprising: When the retransmission scheme is switched, a second indicator indicating that the retransmission scheme is switched is transmitted to the base station.
3. The method of operation of claim 1, further comprising: transmitting a third indicator to the base station requesting to switch the retransmission scheme, and A fourth indicator is received from the base station approving switching of the retransmission scheme, Wherein the retransmission scheme is switched upon receipt of the fourth indicator.
4. The method of operation of claim 1, further comprising: a fifth indicator requesting to switch the retransmission scheme is received from the base station, Wherein the retransmission scheme is switched upon receipt of the fifth indicator.
5. The operating method according to claim 1, wherein the retransmission scheme is switched in units of transport blocks, TBs, code block groups, CBGs, or HARQ processes.
6. The method of operation of claim 1, wherein, When the first retransmission scheme is a HARQ retransmission scheme, the second retransmission scheme is a blind retransmission scheme, and when the first retransmission scheme is a blind retransmission scheme, the second retransmission scheme is a HARQ retransmission scheme, and When the HARQ retransmission scheme is used, HARQ feedback is transmitted, and when the blind retransmission scheme is used, the HARQ feedback is not transmitted.
7. A method of operating a receiving terminal in a communication system, comprising: receiving first data from a transmitting terminal based on a first retransmission scheme; Receiving first level side link control information, i.e., first level SCI, from the transmitting terminal, the first level SCI including a first indicator indicating switching of a retransmission scheme, resource allocation information indicating new resources allocated for a second retransmission scheme as a new retransmission scheme, and resource release information indicating release of resources allocated for the first retransmission scheme as a previous retransmission scheme, and Based on the second retransmission scheme, receiving second data from the transmitting terminal using the resources indicated by the resource allocation information, Based on a result of comparing a channel occupancy state between the receiving terminal and the transmitting terminal with a pre-configured reference value, it is determined to switch the second retransmission scheme to the first retransmission scheme, Based on the first retransmission scheme, third data is received from the transmitting terminal, Wherein the first retransmission scheme and the second retransmission scheme are distinguished according to whether a hybrid automatic repeat request, HARQ, feedback is transmitted.
8. The method of operation of claim 7, wherein, When the first retransmission scheme is a HARQ retransmission scheme, the second retransmission scheme is a blind retransmission scheme, and when the first retransmission scheme is a blind retransmission scheme, the second retransmission scheme is a HARQ retransmission scheme, and When the HARQ retransmission scheme is used, HARQ feedback is transmitted, and when the blind retransmission scheme is used, HARQ feedback is not transmitted.
9. A transmitting terminal, which is a transmitting terminal in a communication system, comprising: processor, and A memory storing more than one instruction executable by the processor, Wherein the one or more instructions are executed to perform operations comprising: Transmitting first data to a receiving terminal based on a first retransmission scheme; Switching a retransmission scheme from the first retransmission scheme to a second retransmission scheme based on a result of comparing a channel occupancy state between the transmitting terminal and the receiving terminal with a pre-configured reference value; Transmitting first level side link control information, i.e., first level SCI, to the receiving terminal, the first level SCI including a first indicator indicating switching of the retransmission scheme, resource allocation information indicating new resources allocated for the second retransmission scheme as a new retransmission scheme, and resource release information indicating release of resources allocated for the first retransmission scheme as a previous retransmission scheme, and resource release information Based on the second retransmission scheme, transmitting second data to the receiving terminal using the resources indicated by the resource allocation information, Wherein the first retransmission scheme and the second retransmission scheme are distinguished according to whether a hybrid automatic repeat request, HARQ, feedback is transmitted.
10. The transmitting terminal of claim 9, wherein the one or more instructions are further executable to transmit a second indicator to a base station indicating that the retransmission scheme was switched when the retransmission scheme was switched.
11. The transmitting terminal of claim 9, wherein the one or more instructions are further executable to: transmitting a third indicator to the base station requesting to switch the retransmission scheme, and A fourth indicator is received from the base station approving switching of the retransmission scheme, Wherein the retransmission scheme is switched upon receipt of the fourth indicator.

Description

Method and device for retransmitting in side link communication Technical Field The present disclosure relates to a side link communication technology, and more particularly, to a technology of retransmitting data in side link communication. Background In order to handle wireless data that has been rapidly increased after commercialization of a fourth generation (4G) communication system (e.g., a long term evolution (Long Term Evolution, LTE) communication system, an LTE-Advanced (LTE-a) communication system), a fifth generation (5G) communication system (e.g., a New Radio (NR) communication system) that uses a frequency band of the 4G communication system (e.g., a frequency band of 6GHz or less) and a frequency band higher than that of the 4G communication system (e.g., a frequency band of 6GHz or more) is considered. The 5G Communication system is capable of supporting enhanced mobile broadband (Enhanced Mobile Broadband, eMBB) Communication, ultra-Reliable and Low-latency Communication (URLLC, low-Latency Communication), mass machine type Communication (MASSIVE MACHINE TYPE Communication, mMTC), and the like. The 4G communication system and the 5G communication system are capable of supporting Vehicle-to-Everything (V2X) communication (e.g., side link communication). V2X communication supported in a Cellular communication system such as a 4G communication system, a 5G communication system, or the like may be referred to as "Cellular-V2X (C-V2X) communication". V2X communications (e.g., C-V2X communications) may include Vehicle-to-Vehicle (V2V) communications, vehicle-to-Infrastructure (V2I) communications, vehicle-to-pedestrian (V2P) communications, vehicle-to-Network (V2N) communications, and the like. In cellular communication systems, V2X communication (e.g., C-V2X communication) may be performed based on side link communication technologies (e.g., proximity-based Service (ProSe) communication technologies, device-to-Device (D2D) communication technologies, etc.). For example, a side link channel can be established for vehicles participating in V2V communication, and communication between vehicles can be performed using the side link channel. Side-chain communication may be performed using configured authorized (configured grant, CG) resources. CG resources may be periodically configured and may be utilized to transmit periodic data (e.g., periodic side link data). On the other hand, a data retransmission procedure may be performed in the side link communication. The data retransmission procedure may be performed based on various schemes. In this case, an operation method of a different retransmission scheme is required in the side link communication. Disclosure of Invention Technical problem An object of the present disclosure to solve the above problems is to provide a method and apparatus for retransmitting data in a side link communication. Technical proposal According to a first exemplary embodiment of the present disclosure for achieving the object, an operation method of a transmitting terminal may include transmitting first data to a receiving terminal based on a first retransmission scheme, switching the retransmission scheme from the first retransmission scheme to a second retransmission scheme in response to a preset condition being satisfied, and transmitting second data to the receiving terminal based on the second retransmission scheme, wherein the first retransmission scheme and the second retransmission scheme are distinguished according to whether or not to transmit hybrid automatic repeat request (HARQ) feedback. The pre-configuration conditions may be configured from the base station by higher layer signaling. The case where the pre-configuration condition is satisfied may be a case when Negative Acknowledgement (NACK) of the first data occurs n times or more or a case when a channel state between the transmitting terminal and the receiving terminal satisfies a reference, and n is a natural number. The method of operation of the transmitting terminal may further include transmitting a first indicator indicating switching of the retransmission scheme to the receiving terminal, wherein the transmitting of the second data is performed after the transmitting of the first indicator. The first indicator may be included in a first stage side link control information (SCI) or a second stage SCI transmitted from the transmitting terminal to the receiving terminal. The operation method of the transmitting terminal may further include transmitting a second indicator indicating that the retransmission scheme is switched to the base station when the retransmission scheme is switched. The method of operation of the transmitting terminal may further include transmitting a third indicator requesting a handover retransmission scheme to the base station, and receiving a fourth indicator approving the handover retransmission scheme from the base station, wherein the retransmission scheme is handed ove