Uplink Resource Pool Selection by Timing Advance Accuracy
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Solution Overview
Problem
Inaccurate timing advance (TA) in user equipment (UE) can cause interference and additional delay in uplink transmissions, especially when UEs self-schedule using shared resource pools, leading to degraded system performance.
Innovation Solution
UEs select resource pools based on timing advance accuracy, using mechanisms like timing difference, downlink signal measurement, or Doppler shift to determine appropriate resource pools with suitable characteristics, reducing interference and avoiding reacquisition of TA values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs use shared resource pools for self-scheduled uplink transmissions, then resource utilization efficiency is improved, but interference increases when TA accuracy is insufficient
Solution Approach 1:
The shared resource pool is segmented into multiple dedicated resource pools based on TA accuracy levels. UEs with different TA accuracy requirements are assigned to different resource pools, preventing interference between UEs with inaccurate TA and those with accurate TA. This segmentation resolves the contradiction by maintaining high resource utilization through dedicated pools while eliminating interference through spatial separation in the resource domain.
Solution Approach 2:
Different resource pools are configured with different characteristics (e.g., different time offsets, frequency allocations, or resource block assignments) tailored to the specific TA accuracy requirements of UEs in each pool. This local quality approach allows each resource pool to be optimized for its specific UE group, maintaining high efficiency for accurate TA UEs while providing protected resources for inaccurate TA UEs, thus resolving the interference issue.
2Productivity
If UEs with inaccurate TA transmit in shared resource pools, then resource pool utilization is improved, but system performance degrades due to interference
Solution Approach 1:
The system segments UEs into different groups based on TA accuracy and assigns them to separate resource pools. This allows inaccurate TA UEs to utilize dedicated resources without degrading the performance of accurate TA UEs, maintaining both high resource pool utilization and reliable system performance through isolated transmission channels.
Solution Approach 2:
The network node acts as an intermediary by configuring and managing multiple resource pools with different characteristics. It monitors UE TA accuracy and dynamically assigns UEs to appropriate pools, serving as a mediator that balances resource utilization efficiency with system performance reliability by preventing inaccurate TA UEs from interfering with accurate TA UEs.
3Reliability
If UEs reacquire TA values frequently to maintain accuracy, then transmission reliability is improved, but signaling overhead and delay increase
Solution Approach 1:
The system performs preliminary classification of UEs by TA accuracy and assigns them to appropriate resource pools in advance. This preliminary action allows UEs with inaccurate TA to be pre-assigned to protected resource pools where they can transmit without causing interference, eliminating the need for frequent TA reacquisition and reducing both delay and signaling overhead while maintaining transmission reliability.
Solution Approach 2:
UEs self-identify their TA accuracy level and autonomously select or are assigned to the appropriate resource pool based on their capability. This self-service mechanism eliminates the need for continuous network intervention and TA reacquisition, reducing signaling overhead and delay while maintaining reliable transmissions through appropriate resource pool selection.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration that indicates a plurality of resource pools. The UE may select a resource pool from the plurality of resource pools based at least in part on a timing advance (TA) accuracy associated with the UE. The UE may transmit, via a resource in the resource pool, an uplink transmission in accordance with a UE uplink self-scheduling. Numerous other aspects are described.