Sidelink Resource Pool Switching After Persistent LBT Failures
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Solution Overview
Problem
Existing wireless communication systems fail to consider sidelink communication processes in Listen Before Talk (LBT) configurations for unlicensed spectrum, leading to inconsistent and unreliable channel access between terminals.
Innovation Solution
Implementing a sidelink communication method that includes flexible resource pool configurations and real-time LBT failure detection, allowing terminals to adapt and communicate reliably by avoiding resource pools with consistent failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT configuration only considers wireless communication between terminal and base station, then base station communication reliability is maintained, but sidelink communication reliability deteriorates due to lack of sidelink-specific failure detection
Solution Approach 1:
The patent segments LBT failure detection into two independent mechanisms: uplink LBT failure detection for terminal-base station communication, and sidelink LBT failure detection for terminal-terminal communication. Each mechanism has its own configuration parameters and detection procedures, allowing sidelink-specific issues to be addressed without affecting uplink communication reliability.
Solution Approach 2:
The base station acts as an intermediary by receiving sidelink LBT failure indication information from terminals and coordinating resource pool reconfiguration. The terminal sends failure indications to the base station, which then adjusts sidelink resource pool configurations to resolve conflicts, enabling centralized coordination for distributed sidelink communication.
2Adaptability or versatility
If terminals use unlicensed spectrum for sidelink communication, then spectrum resource utilization is improved, but channel access reliability worsens due to LBT failures in shared spectrum
Solution Approach 1:
The patent implements feedback mechanisms where terminals monitor sidelink channel access success rates and report LBT failure statistics to the base station. The base station uses this feedback to dynamically adjust sidelink resource pool configurations, including parameter adjustments and resource pool switching, thereby adapting to changing channel conditions and maintaining reliable communication on unlicensed spectrum.
Solution Approach 2:
The system dynamically adjusts sidelink resource pool configurations based on real-time LBT failure detection. The base station can reconfigure parameters such as resource allocation, time-frequency structures, and power settings, or switch to alternative resource pools when LBT failures are detected, enabling adaptive response to shared spectrum conditions.
3Productivity
If consistent LBT failures occur in a resource pool but are not detected, then resource pool utilization is maintained, but communication efficiency deteriorates due to persistent failures
Solution Approach 1:
The patent implements preliminary LBT failure detection mechanisms that continuously monitor channel access attempts before actual sidelink communication occurs. The terminal detects LBT failures by monitoring whether channel access succeeds within expected time windows, and reports these failures to the base station before they significantly impact communication efficiency, enabling proactive resource pool reconfiguration.
Solution Approach 2:
The patent replaces complex mechanical failure detection methods with simplified information-theoretic approaches. The terminal detects LBT failures by analyzing timing relationships and acknowledgment patterns in digital signals, and the base station uses algorithmic processing of failure indication information to determine when resource pool reconfiguration is needed, substituting physical monitoring with computational analysis.
Data Source
Figure 1a~1c
Figure 2a~2b(3)
Figure 2c~3
AI summary
Embodiments of this application provide a sidelink communication method and device. The method includes: A first communication device receives configuration information from a network device. The configuration information is used by the first communication device to detect consistent listen before talk LBT failures that occur in a first resource pool, the configuration information is associated with a first carrier or the first resource pool, and the first resource pool belongs to the first carrier. In addition, the first communication device sends first indication information to the network device. The first indication information indicates the first resource pool in which the consistent LBT failures occur. In this method, validity of a transmission resource of a sidelink resource pool or carrier can be ensured, and network communication reliability can be improved.