Sidelink Timing Control for Wireless Resource Scheduling
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Solution Overview
Problem
Wireless communications systems face scheduling conflicts and collisions due to time delays in sidelink communications, which can result in overlapping reception and transmission resources, leading to reduced communication reliability.
Innovation Solution
Implementing sidelink timing control by configuring a timing gap between sidelink and access link communication resources, or by transmitting timing adjustment requests to adjust sidelink transmission timing, allowing UEs and base stations to manage scheduling conflicts and avoid resource overlaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink communication resources are allocated without timing control, then resource allocation is simple, but scheduling conflicts and collisions occur between sidelink reception and access link communications
Solution Approach 1:
The base station performs preliminary timing control by configuring timing gaps between sidelink reception resources and access link communication resources. This advance configuration prevents scheduling conflicts before they occur, improving communication reliability while maintaining relatively simple implementation through centralized control.
Solution Approach 2:
The base station acts as an intermediary that coordinates timing between sidelink and access link communications. By introducing this mediating entity, the system resolves scheduling conflicts without requiring complex peer-to-peer timing negotiation between UEs, thus improving reliability while controlling complexity.
2Reliability
If timing gaps are configured between sidelink and access link resources, then scheduling conflicts are reduced, but resource utilization efficiency decreases
Solution Approach 1:
The timing gap configuration is made dynamic rather than static. The base station adjusts timing gap parameters based on actual channel conditions, traffic patterns, and UE locations. This allows the system to minimize timing gaps when conflicts are unlikely (improving resource utilization) while maintaining adequate gaps when conflicts are probable (maintaining scheduling conflict management).
Solution Approach 2:
The system changes timing parameters adaptively based on operating conditions. By adjusting timing gap durations and configurations according to actual needs, the system optimizes the balance between preventing scheduling conflicts and maximizing resource utilization efficiency in different scenarios.
3Manufacturing precision
If UE transmits timing adjustment requests to other UEs, then transmission timing accuracy improves, but signaling overhead increases
Solution Approach 1:
The base station serves as an intermediary that collects timing adjustment requirements from UEs and coordinates the timing adjustments centrally. This approach achieves accurate transmission timing through coordinated control while reducing signaling overhead by eliminating the need for direct UE-to-UE timing negotiation and reducing redundant timing requests.
Solution Approach 2:
The system merges timing adjustment functionality into the existing base station control framework. By combining timing management with existing access link control mechanisms, the system achieves accurate timing synchronization without requiring separate dedicated signaling channels for timing adjustments, thus reducing overall signaling overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may communicate with other UEs via sidelinks during sidelink communication resources assigned by a base station. However, due to the propagation delay of signals in a wireless communications system, a first UE may receive a sidelink transmission from a second UE in resources delayed with respect to the resources used for transmission. If the delay results in a scheduling conflict (e.g., overlapping resources for reception), the first UE may transmit a timing request to resolve the conflict. In a first example, the base station may receive the request and configure a timing gap based on the request. In a second example, the timing request may indicate to the second UE a sidelink transmission timing adjustment for communicating with the first UE, and the second UE may determine whether to implement this timing adjustment.