NR V2X Sidelink Timer Wake-Up Using Destination ID Matching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink communication for vehicle-to-everything (V2X) scenarios, particularly in ensuring reliable and low-latency data exchange between user equipment (UEs) without intervention of an evolved Node B, especially in scenarios like vehicle platooning, advanced driving, and remote driving.
Innovation Solution
A method involving a first device starting a timer based on a destination ID match with a source ID, receiving sidelink control information, and performing communication with a second device using this timer to optimize sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If timer-based power saving is implemented in NR V2X sidelink communication, then energy consumption is reduced, but communication reliability may be compromised due to extended sleep periods
Solution Approach 1:
The patent implements dynamic timer management where the first device adjusts its wake-up timing based on receiving second SCI from the second device. The device transitions from a static sleep schedule to a dynamic response mechanism, waking up specifically when destination ID matches are detected in received communications, thereby maintaining reliability while preserving energy savings.
Solution Approach 2:
The patent establishes a feedback loop where the first device monitors incoming second SCI messages containing destination IDs, compares them against its own source ID, and adjusts its active/sleep state accordingly. This feedback mechanism ensures the device remains reliable by responding to actual communication needs while maintaining power saving benefits through informed state transitions.
2Reliability
If the first device continuously monitors for second SCI to maintain communication reliability, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring where the first device wakes up at specific intervals determined by timer expiration and destination ID matches. Instead of continuous monitoring, the device periodically checks for incoming second SCI messages containing its destination ID, thereby reducing energy consumption while maintaining communication reliability through targeted wake-up events.
Solution Approach 2:
The first device autonomously manages its own power state transitions by monitoring destination ID matches in received second SCI messages. The device self-determines when to wake up and remain active based on whether its destination ID appears in incoming communications, eliminating the need for continuous external scheduling and reducing overall energy consumption while maintaining reliability.
3Loss of time
If the first device wakes up early to ensure timely data reception, then latency is reduced, but energy consumption increases due to extended active periods
Solution Approach 1:
The patent implements preliminary action by having the first device wake up just in time to receive and process second SCI messages containing destination ID matches. The device prepares its receiver in advance of actual data transmission by monitoring for scheduling information, thereby reducing latency without needing to remain continuously active, thus optimizing the balance between timely reception and energy consumption.
Data Source
AI summary
Proposed is an operation method of a first device (100) in a wireless communication system. The method may comprise the steps of: starting a first timer associated with an on-duration period; receiving, from a second device (200) via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for the scheduling of second SCI; receiving, from the second device (200) via a physical sidelink shared channel (PSSCH), the second SCI, which includes a 16-bit first destination identifier (ID), and a medium access control (MAC) header, which includes an eight-bit second destination ID; acquiring a third destination ID on the basis of the first destination ID and the second destination ID; comparing the third destination ID with a 24-bit first source ID of a first device (100); starting a second timer on the basis of the first source ID which is the same as the third destination ID; and carrying out sidelink communication with the second device (200) on the basis of the second timer which is operating.