Unlicensed Sidelink Spectrum Allocation with Channel Access Feedback
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Solution Overview
Problem
There is no existing solution for how a network device allocates an unlicensed spectrum resource for sidelink communication in new radio systems.
Innovation Solution
A communication method where a first terminal device determines information about a channel access process, including the result of the channel access process or a resource request message, and sends this information to a network device, which then determines whether to allocate a resource based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device allocates unlicensed spectrum resources for sidelink communication using existing licensed spectrum allocation methods, then resource allocation can be performed, but the allocation effectiveness is insufficient due to lack of channel access process information
Solution Approach 1:
The terminal device feeds back channel access process information (success/failure results, timer expiration status) to the network device. This feedback mechanism enables the network device to make informed resource allocation decisions for unlicensed spectrum, improving allocation effectiveness by avoiding resources that have failed channel access and prioritizing resources with successful access history.
2Ease of operation
If the terminal device performs channel access process on unlicensed spectrum resources without network device coordination, then terminal autonomy is improved, but resource allocation effectiveness deteriorates due to lack of network awareness
Solution Approach 1:
The terminal device autonomously performs channel access processes (LBT, random selection) on unlicensed spectrum resources without real-time network device intervention. The terminal independently determines channel access results and manages its own resource selection, maintaining operational autonomy while enabling network awareness through periodic feedback of access information.
3Productivity
If the network device allocates resources without considering channel access process results, then allocation speed is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The terminal device performs channel access processes in advance before actual data transmission and reports results to the network device. The network device uses this preliminary information to guide subsequent resource allocations, preventing wasted allocations on resources that have already failed channel access and improving overall utilization efficiency without significantly delaying allocation decisions.
Data Source
AI summary
A communication method and apparatus are provided. The method includes: A first terminal device determines first information, where the first information includes a result of a channel access process performed on a first resource, and the first resource is used for sidelink communication between the first terminal device and a second terminal device, or is used for communication between the first terminal device and a network device; or the first information includes a resource request message, and the resource request message is used to request a resource for retransmission on a sidelink between the first terminal device and a second terminal device; and the first terminal device sends the first information to the network device.