Relay Node LBT Statistical Reporting for 5G RLF Analysis
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Solution Overview
Problem
In cellular communication systems, existing methods lack effective mechanisms for accurately reporting and managing Listen Before Talk (LBT) failures and statistical information across different communication directions, which can lead to inefficient network operations and unclear causes of Radio Link Failures (RLF) in the 3GPP 5G system.
Innovation Solution
The proposed communication control method involves storing and transmitting LBT success and failure rates in both uplink and downlink directions as statistical information to upper nodes, and selectively reporting Radio Link Failure (RLF) reports based on the cause of events, allowing for targeted processing and optimization of network configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If LBT statistical information is not separately stored for uplink and downlink directions, then the storage and processing complexity is reduced, but the network management precision and optimization capability deteriorate
Solution Approach 1:
The patent segments LBT statistical information storage by communication direction, maintaining separate counters for uplink and downlink successes and failures. This segmentation enables precise directional performance measurement while organizing the statistical data in a structured manner that manages complexity through clear separation of concerns.
2Loss of information
If RLF reports are transmitted for all predetermined events regardless of cause, then the network receives comprehensive failure information, but the network management efficiency deteriorates due to processing unnecessary reports
Solution Approach 1:
The patent applies preliminary action by storing LBT statistical information (successes and failures) before an RLF event occurs. When a predetermined event happens, the system can immediately determine whether LBT failures were the cause by comparing stored statistics, allowing selective RLF report transmission based on pre-analyzed data rather than transmitting all reports indiscriminately.
Solution Approach 2:
The system implements feedback by analyzing stored LBT statistical information to determine the cause of predetermined events. This feedback mechanism enables the system to intelligently decide whether to transmit RLF reports based on actual LBT failure patterns, improving network management efficiency by filtering out reports caused by factors unrelated to LBT performance.
3Reliability
If LBT failure causes are not identified, then the system operation simplicity is maintained, but the network optimization capability and reliability deteriorate
Solution Approach 1:
The patent performs preliminary action by continuously storing LBT statistical information (number of successes and failures) before RLF events occur. This pre-stored data enables immediate cause identification when predetermined events happen, enhancing communication reliability through rapid failure analysis without adding complex real-time analysis mechanisms.
Data Source
AI summary
In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes performing, at a relay node, Listen Before Talk (LBT). The communication control method includes storing the number of successes and a failure rate in a downlink direction of the performed LBT in a memory as statistical information, and storing the number of successes and a failure rate in an uplink direction of the performed LBT in the memory as statistical information. The communication control method includes transmitting, at the relay node, the statistical information to an upper node of the relay node.