Sidelink Resource Allocation via Scheduling UE Coordination
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Solution Overview
Problem
In wireless communication systems, particularly in New Radio (NR) communication, mode 2 UEs face challenges with resource conflicts and half-duplex issues due to short selection windows for aperiodic traffic, leading to potential Tx resource conflicts and difficulties in predicting Rx timing, especially for services with stringent quality of service (QoS) requirements.
Innovation Solution
A centralized scheduling scheme is introduced, where a scheduling UE (S-UE) coordinates resource allocation among UEs by broadcasting a scheduling indication and providing resource information, thereby avoiding resource conflicts and minimizing half-duplex problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If mode 2 UEs autonomously select sidelink resources from a resource pool with a short selection window to meet latency requirements, then the latency requirement of aperiodic traffic is satisfied, but Tx resource conflicts occur when multiple UEs select the same resource simultaneously
Solution Approach 1:
The patent introduces a scheduling UE (S-UE) as an intermediary that coordinates resource allocation among multiple UEs. The S-UE receives scheduling requests from UEs, determines appropriate sidelink resources, and provides resource information to the requesting UEs. This intermediary mechanism resolves the resource conflict problem while maintaining low latency by centralizing the resource selection process in a trusted UE within proximity of the base station.
2Device complexity
If UEs autonomously select resources without coordination to reduce complexity, then device complexity is reduced, but half-duplex problems occur when messages are transmitted to UEs during their transmission periods
Solution Approach 1:
The scheduling UE acts as a mediator that coordinates not only resource selection but also transmission timing among UEs. By receiving scheduling requests and providing comprehensive resource information including timing details, the S-UE prevents half-duplex conflicts where UEs might transmit and receive simultaneously. This maintains low complexity at individual UE levels while ensuring reliable communication through centralized coordination.
3Reliability
If a centralized scheduling scheme is implemented to coordinate resource allocation among UEs, then resource conflicts and half-duplex problems are reduced, but system complexity increases due to the need for scheduling UE coordination
Solution Approach 1:
The scheduling UE performs the coordination functions using its own existing resources and capabilities without requiring additional dedicated infrastructure. The S-UE leverages its position as a mode 2 UE with proximity to the base station to naturally serve as the scheduling coordinator, reducing overall system complexity while maintaining high reliability through localized centralized management.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatus for user equipment (UE) scheduling-based resource allocation. According to an embodiment of the present disclosure, a method performed by a first UE for wireless communication includes: broadcasting a scheduling indication comprising a serving range; receiving a scheduling request from a second UE within the serving range; and providing resource information to the second UE for performing sidelink transmission.