Multi-Carrier Channel Access via Unified LBT Procedure
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently performing channel access procedures on multiple component carriers in shared radio frequency spectrum bands, particularly in high reliability and low latency applications like V2X communications, due to interference and resource availability uncertainties.
Innovation Solution
A method and apparatus for determining a transmit diversity configuration that declares the result of a channel access procedure based on a transmit diversity criterion, which involves measuring interference levels and using a redundancy number to determine the availability of component carriers for transmission, allowing for efficient channel access and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel access procedure is performed on multiple component carriers individually, then channel access reliability is improved, but access latency and procedure complexity increase
Solution Approach 1:
The patent combines multiple component carrier channel access procedures into a single unified procedure. The UE performs one LBT procedure on a first component carrier and uses the result to determine whether to transmit on multiple component carriers simultaneously, rather than performing separate LBT procedures on each carrier. This merging approach reduces access latency while maintaining reliability through coordinated multi-carrier transmission.
Solution Approach 2:
The channel access result obtained from one component carrier is made universally applicable to multiple component carriers. The single LBT procedure result serves as the basis for determining transmission decisions across multiple carriers, making the channel access mechanism multi-functional and eliminating the need for separate access procedures on each carrier.
2Reliability
If channel access procedure is performed on multiple component carriers individually, then channel access reliability is improved, but procedure complexity increases
Solution Approach 1:
The patent merges multiple independent channel access procedures into a single unified procedure. Instead of executing separate LBT processes on each component carrier, the system performs one LBT procedure and applies the result across multiple carriers, significantly reducing procedural complexity while maintaining the reliability benefits of multi-carrier operation.
3Reliability
If transmit diversity configuration is applied across multiple component carriers, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies transmit diversity configuration partially across component carriers based on the channel access result. When the LBT procedure succeeds, the UE transmits on multiple carriers with diversity configuration; when it fails, transmission is restricted or stopped. This partial application of transmit diversity reduces unnecessary power consumption while maintaining reliability improvements during successful channel access.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A communication device, such as a user equipment (UE) may determine a transmit diversity configuration indicating a transmit diversity criterion for declaring a result of a channel access procedure for a plurality of component carriers in a shared radio frequency spectrum band. The UE may perform the channel access procedure for the plurality of component carriers in the shared radio frequency spectrum band to determine the result of the channel access procedure based at least in part on the transmit diversity criterion. As a result, the UE may transmit or refrain from transmitting a message over at least one component carrier of the plurality of component carriers based at least in part on the result of the channel access procedure.