Radio Resource Controller Session Push for Call Drop Avoidance
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Solution Overview
Problem
In mobile communication networks, especially LTE, handover processes are prone to failures due to non-optimal parameter settings and fast fading situations, leading to lost signaling messages and Radio Link Failures, which disrupt communication sessions.
Innovation Solution
A radio resource controller is configured to push session information into a common data repository accessible by both serving and target radio access nodes, allowing for seamless re-establishment of communication sessions using a mobile identifier and contextual parameters, even if the target node was not initially prepared.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover signaling messages are transmitted during fast fading situations or with non-optimal parameters, then handover should be triggered to maintain communication quality, but signaling messages may be lost leading to Radio Link Failure
Solution Approach 1:
The target eNB performs handover preparation in advance by allocating resources and generating the RRC CONNECTION RECONFIGURATION message before the handover is actually executed. This prepared configuration is stored and can be reused if the original handover signaling is lost, allowing the UE to resume communication without losing the prepared handover context.
Solution Approach 2:
The invention creates a copy of the handover configuration (RRC CONNECTION RECONFIGURATION message) and stores it at the target eNB. This copy serves as a backup that can be transmitted again if the original signaling message is lost during fast fading or other adverse conditions, ensuring the handover can complete successfully.
2Ease of operation
If the UE attempts to resume communication with an unprepared target eNB during RLF recovery, then connection re-establishment may fail, but forcing the connection may cause network instability
Solution Approach 1:
The target eNB autonomously checks whether it has a prepared handover configuration for the UE by examining its internal storage. This self-service mechanism allows the eNB to determine on its own whether it can accept the UE's re-establishment request without needing external coordination, enabling seamless recovery while maintaining network stability through the pre-prepared configuration.
Data Source
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AI summary
The present invention relates to a radio resource controller (220a) for controlling radio resources of a serving radio access node (100a). The controller is configured to assign particular radio resources of the serving radio access node to a radio communication session established between the serving radio access node and a particular mobile station, and to push session information (UE_id; UE_ctx_ptr) of the radio communication session into a common data repository (320) accessible to a further radio resource controller (220b) controlling radio resources of a further radio access node (100b). The session information comprise a mobile identifier (UE_id) that may be used by the particular mobile station for resumption of the radio communication session, and further allow retrieval of contextual communication parameters (UE_ctx) used by the serving radio access node for radio communication with the particular mobile station during the radio communication session. The radio resource controller and the further radio resource controller would run on a common computer platform as two respective process instances. The computer platform would further hold the common data repository.