Sidelink DRX Configuration for V2X Communication
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Solution Overview
Problem
In wireless communication systems, particularly in V2X scenarios, there is a challenge in configuring sidelink discontinuous reception (DRX) without signaling with a base station, leading to potential message transmission outside the DRX On-Duration of receiving UEs, which can result in failed message reception.
Innovation Solution
A method where a user equipment (UE) generates and broadcasts its own sidelink DRX configuration to neighboring UEs, allowing for message transmission within the DRX On-Duration of the receiving UE without establishing a PC5 RRC connection, by using sidelink broadcast channels or SCI formats to convey DRX information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a UE operates in DRX mode without establishing a PC5 RRC connection with neighboring UEs, then signaling overhead is reduced and autonomous operation is improved, but the receiving UE may fail to receive messages transmitted outside the DRX On-Duration
Solution Approach 1:
The transmitting UE performs preliminary action by broadcasting its own DRX configuration parameters (onDurationTimer, inactivityTimer, cycle parameters) to neighboring UEs before message transmission. This allows the receiving UE to proactively adjust its DRX timing to align with the transmitting UE's transmission schedule, ensuring reliable message reception without requiring PC5 RRC connection establishment.
Solution Approach 2:
The system implements feedback mechanism where receiving UEs receive and process DRX configuration information broadcast by transmitting UEs. The receiving UE uses this feedback information to adjust its DRX timing parameters, creating a coordinated communication rhythm that ensures messages are received within the appropriate On-Duration windows even without formal RRC connection.
2Reliability
If a PC5 RRC connection is established between UEs to share DRX configurations, then message transmission reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The invention extracts the essential DRX configuration information from the complex PC5 RRC connection establishment process. Instead of requiring full connection setup, the system extracts and broadcasts only the critical DRX parameters (onDurationTimer, inactivityTimer, cycle timing) through simplified broadcast messages on the sidelink, achieving the necessary coordination with significantly reduced complexity.
Solution Approach 2:
The transmitting UE creates a simplified copy of its DRX configuration parameters and broadcasts this information to neighboring UEs. This copied information is sufficient for receiving UEs to independently configure their own DRX timing, eliminating the need for complex bidirectional negotiation and full RRC connection establishment.
3Loss of energy
If DRX configuration is broadcast on sidelink without RRC connection, then signaling overhead is reduced, but coordination between transmitting and receiving UEs becomes difficult
Solution Approach 1:
The broadcast message serves multiple functions simultaneously: it conveys DRX configuration parameters, announces the transmitting UE's operational timing pattern, and enables receiving UEs to autonomously configure their reception windows. This multi-functional broadcast approach eliminates the need for separate coordination protocols while maintaining flexible adaptation to different transmission scenarios.
Data Source
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AI summary
An embodiment relates to a method for a first terminal operating in a wireless communication system, the method comprising the steps of: transmitting application information from an application layer to a vehicle-to-everything (V2X) layer; generating, in the V2X layer, sidelink (SL) discontinuous reception (DRX) information on the basis of the application information; transmitting the SL DRX information from the V2X layer to an AS layer; and communicating with a second terminal by applying the SL DRX information in the AS layer, wherein the application information includes at least one application requirement.