Sidelink Channel Access via Relay Resource Segmentation
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Solution Overview
Problem
Current 5G sidelink communication systems face challenges in efficiently managing channel access in unlicensed spectrum, particularly in coordinating resource sharing and interference measurement among user equipment (UEs) to prevent collisions and optimize channel usage.
Innovation Solution
The method involves a UE triggering a listen-before-talk process to access resources, receiving grants for channel access, and then allocating and sharing remaining resources with other UEs, including interference measurement and reporting to optimize resource allocation based on channel access priority values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs simultaneously request channel access in unlicensed spectrum, then channel utilization increases, but collisions and interference between UEs increase
Solution Approach 1:
The patent implements a reservation mechanism where a first UE reserves channel resources before actual data transmission. Other UEs must request and obtain permission from the first UE before accessing the channel, preventing collisions in advance. This preliminary reservation action enables multiple UEs to share the channel efficiently while avoiding simultaneous access conflicts.
Solution Approach 2:
The patent establishes a feedback mechanism where UEs report their channel access intentions and receive grants or denyals from the first UE. This feedback loop allows the system to coordinate multiple UE requests, allocate resources fairly, and prevent collisions by informing each UE of its access status before transmission occurs.
2Measurement precision
If UEs perform interference measurement and reporting, then resource allocation accuracy improves, but system complexity and overhead increase
Solution Approach 1:
The patent implements self-service interference measurement where each UE autonomously measures interference levels and reports them to the first UE. This distributed approach eliminates the need for centralized interference management, reducing system complexity while maintaining measurement accuracy. Each UE uses its own reception capabilities to assess the channel environment and communicate findings efficiently.
3Productivity
If the first UE allocates remaining resources to multiple UEs, then channel access efficiency increases, but coordination complexity and grant management overhead increase
Solution Approach 1:
The patent segments the channel access process into distinct phases: the first UE obtains initial channel access, then distributes remaining resources to other UEs through individual grants. This segmentation allows efficient resource sharing while managing complexity by handling each UE's allocation separately based on its specific needs and interference characteristics.
Solution Approach 2:
The patent implements dynamic resource allocation where the first UE adjusts grant decisions based on real-time interference measurements and UE requests. This dynamic approach optimizes channel access efficiency by adapting to changing conditions while managing coordination complexity through flexible, needs-based allocation rather than rigid predetermined schedules.
Data Source
AI summary
Apparatus and methods for channel access in an Unlicensed (UL) Sidelink (SL) communication system. In one embodiment, a relay UE triggers a listen-before-talk (LBT) process requesting to access first resources for transmission of data to a base station (BS), or reception of data from the BS. In response to the LBT, the relay UE receives a first grant that indicates the first resources for the transmission of data to a base station (BS), or reception of data from the BS. The relay UE receives from one or more UEs which are in a first set, wherein the first set of UEs are in communication range of the first UE, requests to access second resources for transmission or reception of data between the first UE, and the one or more UEs in the first set. Finally, the relay UE transmits grants of the second resources, to the one or more UEs of the first set, wherein the second resources include the remaining part of the first resources not used by the first UE.