UE Context Synchronization for Fast RRC Recovery
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Solution Overview
Problem
In wireless communication technology, particularly in small cell scenarios, there is a lack of effective solutions for UE fast recovery, leading to potential data loss and service disruption when a UE moves out of macro cell coverage.
Innovation Solution
A method involving UE context synchronization and re-establishment across base stations in a small cell cluster, where the serving base station transmits and saves UE context information, enabling quick RRC connection re-establishment and ensuring service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE moves out of macro cell coverage in small cell scenario, then service continuity is disrupted, but implementing UE context synchronization across base stations increases device complexity
Solution Approach 1:
The serving base station performs UE context synchronization to neighboring base stations in the small cell cluster before the UE actually moves out of coverage. This preliminary action ensures that when radio link failure occurs, the target base station already has the UE context and can immediately perform RRC connection re-establishment without delay, thus maintaining service continuity while managing complexity through proactive preparation
Solution Approach 2:
The UE context is copied from the serving base station to neighboring base stations in the small cell cluster. This copying mechanism allows any base station in the cluster to take over UE service immediately upon failure, as they all possess identical context information. This approach ensures reliability through redundancy while keeping the complexity manageable by using simple information replication rather than complex real-time coordination
2Loss of time
If UE performs RRC connection re-establishment without context synchronization, then recovery time is delayed, but implementing context synchronization increases information transmission overhead
Solution Approach 1:
UE context synchronization is performed in advance when the UE initially accesses the serving base station or during handover procedures. This preliminary action ensures that the context is already available at neighboring base stations before any potential failure occurs, enabling immediate RRC connection re-establishment and minimizing recovery time without requiring additional information transmission during the critical recovery phase
Solution Approach 2:
The UE context synchronization process is merged with existing procedures such as initial access and handover. By combining the context synchronization with these mandatory procedures, the patent avoids adding separate overhead transmissions. The context information is transmitted as part of the normal operational流程, thus reducing recovery time without significantly increasing additional information overhead
Data Source
AI summary
A method for supporting fast recovery of a User Equipment (UE) includes performing, by a serving base station, UE context synchronization for one or more other base stations in a related small cell cluster when a UE accesses the serving base station, performing, by a base station that the UE performs a radio resource control (RRC) connection re-establishment, the RRC connection re-establishment for the UE according to UE context saved in a synchronization process. The present also discloses another method and system for supporting UE fast recovery. By applying the technical solution disclosed by the present disclosure, when the UE moves in a small cell scenario, the UE can be recovered quickly in the case of a failure, so as to avoid the UE returns to an idle mode, avoid data loss, guarantee business continuity, and improve UE experience.