Multi-Beam CCA Selection for Reliable URLLC Transmission
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks using unlicensed frequency bands, the reliability and latency of Ultra Reliable Low Latency Communications (URLLC) services are compromised due to unsuccessful channel listening during beam-based transmission, as interference levels on different beams can vary, leading to failed Clear Channel Assessments (CCA).
Innovation Solution
Perform Clear Channel Assessment (CCA) detection on multiple beams and select a beam for transmission only if CCA is successful, with priority ordering based on beam indices or configuration information from the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-based transmission is used to ensure coverage and resist path loss, then transmission reliability is improved, but the complexity of channel access control increases due to varying interference levels on different beams
Solution Approach 1:
The patent segments the channel access control process by introducing a dedicated Clear Channel Assessment (CCA) indication message that separately communicates channel availability status for each beam. This segmentation allows the system to maintain beam-based transmission reliability while simplifying overall channel access control, as each beam's channel status is independently indicated and can be processed separately by the network device and terminal.
Solution Approach 2:
The patent introduces a CCA indication message as an intermediary element between the channel listening process and the transmission decision. This intermediary carries explicit channel availability information for multiple beams, decoupling the complex interference measurement process from the transmission scheduling decision, thereby reducing control complexity while preserving transmission reliability.
2Productivity
If LBT detection is performed on a determined transmitting beam, then channel occupancy is controlled, but transmission success rate decreases when interference level exceeds threshold
Solution Approach 1:
The patent applies preliminary action by performing Clear Channel Assessment (CCA) detection on multiple candidate beams before final transmission scheduling. The network device determines channel availability status for multiple beams in advance and communicates this information through CCA indication messages, allowing the terminal to prepare transmission on suitable beams before actual data transmission, thereby improving transmission success rate while maintaining reliable channel access control.
Solution Approach 2:
The patent changes the parameter of channel assessment from a single-beam threshold check to a multi-beam differential assessment. By comparing interference levels across multiple beams and identifying beams with lower interference (better channel conditions), the system dynamically selects optimal transmission beams, improving transmission success rate while maintaining controlled channel access through the CCA mechanism.
3Device complexity
If single beam transmission is used, then device complexity is reduced, but transmission reliability decreases due to interference variations across different beam directions
Solution Approach 1:
The patent segments the beam management function by introducing separate CCA indication messages for different beams. Instead of managing all beam parameters centrally, the system segments channel availability information into beam-specific indicators, reducing overall device complexity while enabling reliable transmission by allowing selection among multiple beams with favorable channel conditions.
Solution Approach 2:
The patent adds a new dimension to beam selection by introducing spatial diversity through multiple beams with different directions. Instead of relying on a single beam, the system evaluates channel conditions across multiple spatial dimensions (different beam directions) and selects the optimal beam based on CCA results, thereby improving transmission reliability without significantly increasing device complexity through the structured CCA indication mechanism.
Data Source
AI summary
Disclosed are an information transmission method and device and a storage medium. The method includes: determining a plurality of beams for which clear channel assessment detection is to be performed; based on each beam of the plurality of beams, performing clear channel assessment detection in a beam direction corresponding to each beam; in response to presence of one or more beams among the plurality of beams for which the clear channel assessment detection is successful, determining a beam for transmitting information among the one or more beams for which the clear channel assessment detection is successful, and transmitting the information.