Mobile Random Access LBT Failure Logging for Reliable Service
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Solution Overview
Problem
In mobile communication systems, particularly in unlicensed frequency bands, listen-before-talk (LBT) failures during random access procedures can lead to service disruptions and inefficiencies, which are not effectively addressed by existing technologies.
Innovation Solution
A method and apparatus for logging listen-before-talk (LBT) failure information in a mobile communication system, where a terminal generates and reports random access information upon successful transmission of a preamble after detecting LBT failures, allowing for improved service provision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT failures are not logged and reported, then the system operates simpler without additional logging mechanisms, but service provision reliability deteriorates due to unmanaged LBT failures in unlicensed bands
Solution Approach 1:
The terminal logs LBT failure information in advance during the random access procedure before service disruption occurs. The MAC entity stores the number of LBT failures and associated configuration information (such as SCell index, BWP index, carrier frequency) in a buffer, preparing the data for subsequent reporting to enable reliable service recovery
Solution Approach 2:
The terminal reports the logged LBT failure information to the network side through uplink signaling (e.g., RRC message or MAC CE). This feedback mechanism enables the network to detect LBT failures, adjust transmission parameters, and improve service provision reliability in unlicensed frequency bands based on actual channel conditions
2Productivity
If LBT failure information is logged and reported, then resource utilization efficiency improves through better channel access management, but information processing overhead increases due to additional logging and reporting
Solution Approach 1:
The patent extracts only the essential LBT failure information elements for logging and reporting, such as the number of LBT failures, SCell index, BWP index, and carrier frequency. By selecting and storing only these critical parameters rather than complete transmission details, the system achieves improved resource utilization efficiency while minimizing information processing overhead
Solution Approach 2:
The terminal changes the parameter representation by counting LBT failure instances and storing them as a numerical value, along with associated configuration parameters. This parameter transformation enables efficient compression and transmission of LBT failure information, improving resource utilization while reducing the overhead of information processing and reporting
Data Source
AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. A method and an apparatus for logging listen-before-talk (LBT) failure information in a mobile communication system are provided. The operation method of a terminal in a wireless communication system includes attempting to transmit a preamble in a random access procedure via an unlicensed spectrum, in case that one or more failures of the attempting to transmit the preamble according to LBT failure is detected, generating information on random access report including a number of the one or more failures of the attempting to transmit the preamble, accessing to a base station based on the preamble after the attempting to transmit the preamble is successful, and transmitting, to the base station, the information on random access report.