Sidelink Feedback Timing Alignment for Uplink Slot Mapping
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink feedback reporting due to timing mismatches between sidelink and uplink resources, leading to inefficiencies and potential interference.
Innovation Solution
Implementing a method where sidelink feedback is provided on an uplink resource separated by a minimum processing time from the sidelink resource, based on respective parameters, and aligning slot structures between sidelink and uplink connections using timing adjustments to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink feedback is provided on an uplink resource without sufficient separation from the sidelink resource, then resource utilization is improved, but processing time is insufficient leading to timing mismatches and interference
Solution Approach 1:
The base station pre-configures the minimum processing time parameter (K) for the UE before sidelink feedback transmission. This preliminary configuration allows the UE to plan its processing schedule in advance, ensuring sufficient time between receiving sidelink feedback and transmitting uplink feedback, thereby preventing timing mismatches while optimizing resource utilization.
Solution Approach 2:
The minimum processing time parameter is made dynamic and configurable based on specific connection parameters (subcarrier spacing, cyclic prefix length, UE capability). This allows the system to adapt the time separation dynamically to different scenarios, ensuring sufficient processing time when needed while minimizing resource waste when not required, thus resolving the contradiction between resource utilization and processing time requirements.
2Productivity
If uplink resource is configured close to sidelink resource to improve efficiency, then resource utilization increases, but timing alignment between sidelink and uplink slot structures deteriorates
Solution Approach 1:
The invention changes the timing parameter (K) based on the relationship between sidelink and uplink slot structures. By adjusting K according to slot alignment requirements, the system ensures that uplink feedback transmission occurs in properly aligned slots while maintaining high efficiency. This parameter adaptation resolves the contradiction between close resource configuration and slot structure stability.
3Reliability
If minimum processing time is increased to ensure sufficient processing capability, then timing mismatches are reduced, but resource utilization efficiency decreases
Solution Approach 1:
The minimum processing time is optimized locally for each specific UE connection based on its capabilities and the specific sidelink/uplink parameters. Rather than applying a uniform conservative value to all connections, the system determines the appropriate K value for each local scenario, ensuring sufficient timing accuracy where needed while minimizing resource waste in other cases, thus resolving the contradiction between reliability and efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may apply a timing adjustment for a sidelink connection with a second UE, wherein the timing adjustment causes a slot structure on the sidelink connection to align with a slot structure on an uplink connection with a base station; and transmit sidelink feedback, received via the sidelink connection, on the uplink connection based at least in part on the timing adjustment, wherein the sidelink feedback is mapped to a slot on the uplink connection, of two or more slots on the uplink connection that the sidelink feedback overlaps, based at least in part on a rule. Numerous other aspects are provided.