NR Sidelink Assistance Message Timing for Reliable Resource Selection
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Solution Overview
Problem
In wireless communication systems, particularly for Mode 2 UE operations, the autonomous resource selection process is inefficient and prone to increased latency and reduced reliability due to the substantial computational load and reliance on outdated assistance information messages (AIMs), especially for power-sensitive and bandwidth-restricted devices.
Innovation Solution
The UE receives assistance information messages (AIMs) from other UEs, but only considers them if predefined conditions are met, such as timing, validity, and quality of service, to ensure the information is relevant and reliable for resource selection, thereby reducing reliance on outdated data and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user devices perform extensive sensing operations to autonomously select resources for transmission, then resource selection reliability is improved, but power consumption increases and processing complexity increases
Solution Approach 1:
The patent introduces assistance information messages as an intermediary mechanism that enables user devices to share sensing results and resource allocation information. Instead of each device performing complete sensing operations independently, devices can utilize assistance information from other devices to make resource selection decisions, thereby reducing individual sensing burden and power consumption while maintaining reliable resource selection through coordinated information sharing
2Reliability
If user devices perform extensive sensing operations to autonomously select resources for transmission, then resource selection reliability is improved, but device complexity increases
Solution Approach 1:
The assistance information messages serve as a mediator that simplifies the sensing process by providing pre-processed resource allocation information and sensing results from other devices. This reduces the processing complexity of individual devices while maintaining reliable resource selection through the coordinated use of shared information
Solution Approach 2:
The patent implements preliminary action by having devices perform sensing operations and generate assistance information in advance, which can then be reused for future resource selection decisions. This reduces the need for repeated extensive sensing operations, thereby reducing processing complexity while maintaining selection reliability
3Reliability
If user devices perform extensive sensing operations to autonomously select resources for transmission, then resource selection reliability is improved, but transmission latency increases
Solution Approach 1:
The patent applies preliminary action by performing sensing operations and generating resource allocation information in advance, which can be immediately utilized when transmission opportunities arise. This reduces the time required for resource selection during actual transmission moments, thereby reducing latency while maintaining reliability through pre-computed sensing results
Solution Approach 2:
The assistance information messages act as an intermediary that enables rapid resource selection by providing pre-processed sensing results and allocation information. Devices can quickly reference this pre-computed information rather than performing extensive sensing operations in real-time, thereby reducing transmission latency while maintaining reliable resource selection
4Use of energy by moving object
If assistance information messages are used to reduce sensing operations, then power consumption is reduced, but information validity and reliability may be compromised
Solution Approach 1:
The patent implements feedback mechanisms through expiry timers and validity indicators in assistance information messages. These feedback elements allow receiving devices to assess the freshness and validity of the assistance information, ensuring that only reliable and current information is used for resource selection. This maintains information validity while enabling reduced sensing operations and lower power consumption
Data Source
AI summary
A user device, UE, for a wireless communication system is described. The wireless communication system including a plurality of user devices, UEs. Responsive to a trigger for a transmission, the UE obtains a candidate resource set for the transmission by selecting resources for the transmission within a selection window following the trigger. The UE selects the resources by taking into consideration sensing results obtained by the UE during a sensing window preceding the trigger, and the sensing results indicate whether certain resources are available or unavailable for the transmission. The UE receives from one or more further UEs one or more reports or assistance information messages, AIMs, including resource allocation related assistance information, and considers a received report or AIM for selecting resources for the transmission when one or more predefined conditions are met.