US-20260128989-A1 - METHOD AND APPARATUS FOR ADAPTIVE RETRANSMISSION OF DENM BASED ON 5G NR V2X, AND STORAGE MEDIUM STORING COMPUTER-EXECUTABLE PROGRAM

Abstract

Provided is a method for adaptive retransmission of a DENM based on 5G NR V2X, the method including generating a plurality of aperiodic messages according to message characteristics, calculating channel congestion for the plurality of generated aperiodic messages, determining resources for the plurality of messages based on the channel congestion, and transmitting, to a reception UE, at least one message among the plurality of messages based on the resources.

Inventors

• Cheol Mun
• Seung Jae Yu

Assignees

• KOREA NATIONAL UNIVERSITY OF TRANSPORTATION INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Dates

Publication Date

20260507

Application Date

20241203

Priority Date

20241106

Claims (9)

1. 1 . A method for adaptive retransmission of a decentralized environmental message (DENM) based on 5G new radio (NR) Vehicle to Everything (V2X), the method comprising: generating a plurality of aperiodic messages according to message characteristics; calculating channel congestion for the plurality of generated aperiodic messages; determining resources for the plurality of messages based on the channel congestion; and transmitting, to a reception user equipment (UE), at least one message among the plurality of messages based on the resources.
2. 2 . The method according to claim 1 , further comprising reserving resources for the plurality of aperiodic messages based on a dynamic scheduling (DS) scheme using a new resource each time a message is generated before the calculating.
3. 3 . The method according to claim 1 , wherein the calculating comprises calculating channel congestion of a current channel for the plurality of aperiodic messages a specific number of slots before transmission of a first aperiodic message among the plurality of aperiodic messages.
4. 4 . The method according to claim 1 , wherein the determining comprises reserving a resource for at least one message among the plurality of messages according to the channel congestion, and canceling resources for remaining messages except for the at least one message among the plurality of messages.
5. 5 . An apparatus for adaptive retransmission of a DENM based on 5G NR V2X, the apparatus comprising: a database configured to store data; and a processor configured to process the data, wherein the processor is configured to: generate a plurality of aperiodic messages according to message characteristics; calculate channel congestion for the plurality of generated aperiodic messages; determine resources for the plurality of messages based on the channel congestion; and transmit, to a reception UE, at least one message among the plurality of messages based on the resources.
6. 6 . The apparatus according to claim 5 , wherein the processor reserves resources for the plurality of aperiodic messages based on a DS scheme using a new resource each time a message is generated.
7. 7 . The apparatus according to claim 5 , wherein the processor calculates channel congestion of a current channel for the plurality of aperiodic messages a specific number of slots before transmission of a first aperiodic message among the plurality of aperiodic messages.
8. 8 . The apparatus according to claim 5 , wherein the processor reserves a resource for at least one message among the plurality of messages according to the channel congestion, and cancels resources for remaining messages except for the at least one message among the plurality of messages.
9. 9 . A storage medium storing a computer-executable program configured to perform steps of: generating a plurality of aperiodic messages according to message characteristics; calculating channel congestion for the plurality of generated aperiodic messages; determining resources for the plurality of messages based on the channel congestion; and transmitting, to a reception UE, at least one message among the plurality of messages based on the resources.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Korean Patent Application No. 10-2024-0156297, filed on Nov. 6, 2024, which is hereby incorporated by reference as if fully set forth herein. BACKGROUND OF THE INVENTION Field of the Invention Embodiments relate to a method and apparatus for adaptive retransmission of a decentralized environmental message (DENM) based on 5G new radio (NR) Vehicle to Everything (V2X), and a storage medium storing a computer-executable program. Description of the Related Art V2X communication technology is recognized as key technology for autonomous driving. 3rd generation partnership project (3GPP) has standardized 5G-based NR V2X technology to support this V2X technology in Rel 16. In addition, 3GPP has defined a physical (PHY) layer and a medium access control (MAC) layer of NR V2X. In the MAC layer, a MODE 1 resource allocation method that supports uplink and downlink communication between a base station and a user equipment (UE) through a radio access network (RAN) and a MODE 2 resource allocation method for direct communication between UEs through a side-link are defined. In this case, in a situation where periodic messages and aperiodic messages are mixed and transmitted, there is a problem in that retransmission of the aperiodic messages increases resource reselection and increases the number of resource collisions with the periodic messages, resulting in performance degradation of the periodic messages. Accordingly, there is increasing interest in resource collisions caused by indiscriminate retransmission of aperiodic messages. However, there is insufficient practical research to reduce these resource collisions. SUMMARY OF THE INVENTION Disclosed embodiments are intended to solve the above-mentioned problems, and provide a method and apparatus for adaptive retransmission of a DENM based on 5G NR V2X, and a storage medium storing a computer-executable program. Disclosed embodiments provide a hybrid resource reservation scheme that utilizes a dynamic scheduling (DS) scheme for reserving resources for aperiodic messages and a sensing based semi-persistent scheduling (SB-SPS) scheme for reserving resources for periodic messages. Disclosed embodiments provide an adaptive aperiodic message retransmission scheme that reserves resources by adaptively adjusting the number of retransmissions of an aperiodic message depending on channel congestion. In accordance with an aspect of the present disclosure, the above and other objects can be accomplished by the provision of a method for adaptive retransmission of a decentralized environmental message (DENM) based on 5G new radio (NR) Vehicle to Everything (V2X), the method including generating a plurality of aperiodic messages according to message characteristics, calculating channel congestion for the plurality of generated aperiodic messages, determining resources for the plurality of messages based on the channel congestion, and transmitting, to a reception user equipment (UE), at least one message among the plurality of messages based on the resources. The method may further include reserving resources for the plurality of aperiodic messages based on a dynamic scheduling (DS) scheme using a new resource each time a message is generated before the calculating. The calculating may further include calculating channel congestion of a current channel for the plurality of aperiodic messages a specific number of slots before transmission of a first aperiodic message the among plurality of aperiodic messages. The determining may include reserving a resource for at least one message among the plurality of messages according to the channel congestion, and canceling resources for remaining messages except for the at least one message among the plurality of messages. In accordance with another aspect of the present disclosure, there is provided an apparatus for adaptive retransmission of a DENM based on 5G NR V2X, the apparatus including a database configured to store data, and a processor configured to process the data, wherein the processor is configured to generate a plurality of aperiodic messages according to message characteristics, calculate channel congestion for the plurality of generated aperiodic messages, determine resources for the plurality of messages based on the channel congestion, and transmit, to a reception UE, at least one message among the plurality of messages based on the resources. The processor may reserve resources for the plurality of aperiodic messages based on a DS scheme using a new resource each time a message is generated. The processor may calculate channel congestion of a current channel for the plurality of aperiodic messages a specific number of slots before transmission of a first aperiodic message among the plurality of aperiodic messages. The processor may reserve a resource for at least one message among the plurality of messages according to the channel congestion, and