UE RRC Failure Logging for Handover Reliability
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Solution Overview
Problem
Existing handover mechanisms in LTE and NR wireless communication systems suffer from increased interruption time and reduced reliability due to factors like weak signal conditions and heavy load on serving base stations.
Innovation Solution
A method and user equipment (UE) for enhanced mobility, which involves detecting RRC connection establishment failures, logging relevant parameters, and reporting accessibility measurements to the base station. This allows for accurate evaluation of resources used during failures and improves handover reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing handover mechanisms are used in LTE and NR wireless communication systems, then handover can be performed between base stations, but interruption time increases and reliability decreases due to weak signal conditions and heavy load on serving base stations
Solution Approach 1:
The UE performs accessibility measurements and logs parameters (such as SSB information and uplink carrier information) during RRC connection establishment attempts before actual handover is needed. This preliminary logging of accessibility measurements allows the base station to assess resource usage and handover feasibility in advance, enabling faster and more reliable handover execution without increasing interruption time
Solution Approach 2:
The UE reports the logged accessibility measurements to the base station, providing feedback information about the resources used during RRC connection establishment attempts. This feedback enables the base station to make informed handover decisions based on actual measured data, improving handover reliability while avoiding unnecessary interruptions by selecting appropriate target cells and resources
2Measurement precision
If accessibility measurements are logged and reported during RRC connection establishment failure, then base station can accurately evaluate resource usage, but device complexity and signaling overhead increase
Solution Approach 1:
The accessibility measurement logging mechanism is designed to reuse existing logging infrastructure and parameters already defined for other purposes in the system. By logging SSB information and uplink carrier information that are already being tracked for connection establishment, the patent achieves accurate resource usage evaluation without requiring entirely new measurement mechanisms, thus limiting the increase in device complexity
Solution Approach 2:
The UE autonomously determines when to log accessibility measurements based on detecting RRC connection establishment failures, and self-manages the reporting process by indicating the presence of connection establishment failure reports to the base station. This self-service approach allows the UE to perform measurements and manage reporting without requiring complex centralized control, reducing overall system complexity while maintaining measurement precision
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). Embodiments herein disclose a method for reporting an accessibility measurement by a UE based on a RRC connection establishment failure in a wireless communication system. The method includes detecting a RRC connection establishment failure and logging parameters selected while attempting the failed RRC connection establishment, wherein the logged parameters are referred as accessibility measurements. Further, the method includes indicating a presence of a connection establishment failure report to a base station and reporting a connection establishment failure report to the base station, in response to receiving request from the base station, wherein the failure report comprises accessibility measurements that comprise at least one of a SSB information selected during cell access and subsequently on which the UE encountered the RRC connection establishment failure and a uplink carrier information selected during cell access and subsequently on which the UE encountered the establishment failure.