Listen-Before-Talk Assistance via Second-Carrier Interference Feedback
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Solution Overview
Problem
Listen-before-talk operations in wireless communications networks may fail, preventing communication from occurring, and existing methods for overcoming these failures are inefficient and lead to high signaling overhead and latency.
Innovation Solution
Exchange of assistance information between network devices and user equipment using a low power signal to perform listen-before-talk operations, allowing interference measurements without full listen-before-talk procedures, thereby reducing signaling overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If listen-before-talk operations are performed on the first carrier, then communication reliability is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent uses a second carrier as an intermediary channel to exchange LBT assistance information between the network device and user equipment. This mediator carrier allows the transmission of interference measurement results and LBT configuration data without requiring LBT procedures on the first carrier, thereby reducing signaling overhead and latency while maintaining communication reliability on the target carrier.
Solution Approach 2:
The patent divides the communication system into two separate carriers: a first carrier for data transmission requiring LBT operations, and a second carrier for exchanging LBT assistance information. This segmentation allows the control plane (LBT information exchange) to be separated from the user plane (data transmission), enabling efficient LBT coordination without blocking data traffic and reducing overall signaling overhead.
2Reliability
If full listen-before-talk procedures are performed, then channel access reliability is improved, but communication efficiency deteriorates
Solution Approach 1:
The patent implements preliminary action by having the network device and user equipment exchange LBT assistance information, including interference measurement results, before actual LBT operations on the first carrier. This advance preparation allows devices to pre-assess channel conditions and configure appropriate LBT parameters, reducing the time and complexity of actual channel access attempts and improving communication efficiency.
Solution Approach 2:
The patent establishes a feedback mechanism where user equipment measures interference on the first carrier and reports these measurements back to the network device via the second carrier. The network device uses this feedback information to make informed decisions about LBT operations, adjusting transmission parameters based on actual channel conditions. This feedback loop improves channel access reliability while maintaining efficiency by avoiding unnecessary LBT procedures.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for assistance for performing listen-before-talk operations. One method includes exchanging, at a network device and with a UE in a second carrier without performing a listen-before-talk operation, assistance information for performing listen-before-talk for a first carrier. The method includes transmitting, to the UE on the second carrier without performing the listen-before-talk operation, an indication to perform interference measurement on the first carrier. The method includes receiving, from the UE on the second carrier, first assistance information including an indication of the results of interference measurement at the UE of the first carrier. The method includes transmitting, to the UE on the second carrier without performing the listen-before-talk operation, second assistance information including an indication of the results of interference measurement at the network device of the first carrier.