Base Station MBMS Request Storage for Handover Latency
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Solution Overview
Problem
In the LTE/SAE system, when a UE in an idle state moves from an SFN area to a non-SFN area, the service suspension time is increased due to the need for MBMS bearer setup, and redundant bearers are established, leading to wastage of radio resources.
Innovation Solution
A radio communication base station apparatus and method that stores the MBMS reception request and determines whether to perform handover from an SFN area to a non-SFN area, allowing the core network to send the stored request only when handover is confirmed, thereby reducing service suspension time and conserving radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE sends an MBMS reception request immediately upon moving from SFN area to non-SFN area, then the service can be restored quickly, but redundant MBMS bearers are established causing radio resource wastage
Solution Approach 1:
The base station stores the MBMS reception request in advance when the UE is in idle state, before handover actually occurs. This preliminary storage allows the request to be ready for immediate transmission upon handover confirmation, reducing service suspension time without triggering premature bearer establishment that would waste radio resources
Solution Approach 2:
The system dynamically determines whether to transmit the stored MBMS reception request based on the actual handover status. The base station transmits the request only when handover from SFN to non-SFN area is confirmed, adapting the transmission timing to the actual network conditions and UE location, thereby avoiding redundant bearer establishment while ensuring timely service restoration
2Reliability
If the MBMS bearer is established before handover completion, then service continuity is improved, but radio resources are consumed in vain in the SFN area
Solution Approach 1:
The base station performs preliminary storage of the MBMS reception request during the idle state, before handover occurs. This preparation ensures that when handover is confirmed, the request can be immediately transmitted and processed, achieving service continuity without the need to establish bearers prematurely in the SFN area
Solution Approach 2:
The system uses feedback from handover confirmation to trigger the transmission of the stored MBMS reception request. The base station monitors the handover status and only transmits the request when handover from SFN to non-SFN area is actually completed, ensuring service continuity is achieved at the right moment without wasting radio resources on premature bearer establishment
Data Source
AI summary
Disclosed are a radio communication base station device and a radio communication method which can reduce the interruption time of a service being received by UE while suppressing a resource consumption amount in an SFN area when the UE performs a handover from the SFN area to a non-SNF area. An MBMS reception request identification unit (127) judges an RRC message inputted from the UE (100). If an MBMS reception request is contained, an MBMS reception request is transmitted to an MBMS reception request storage unit (124). Moreover, when the RRC message from the UE (100) contains an adjacent cell reception quality measurement result, a handover decision unit (126) judges whether to perform a handover to the adjacent cell. The MBMS reception request storage unit (124) stores the MBMS reception request outputted from the MBMS reception request identification unit (127). When the handover decision unit (126) which has decided the handover requests for transmission of an MBMS reception request, the MBMS reception request storage unit (124) transmits the MBMS reception request to an MME (140).