MBMS Interest Indication Message for Wireless Handover Continuity
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Solution Overview
Problem
User equipment (UE) may experience disruptions in receiving multimedia broadcast/multicast services (MBMS) when moving from a cell that does not broadcast system information for MBMS to a cell that does, leading to service interruptions and loss of MBMS service continuity.
Innovation Solution
The UE receives system information from a first base station (BS) and transmits an MBMS interest indication message to the first BS during handovers, ensuring seamless service continuity by determining if the target BS supports MBMS and transmitting the message accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs handover from a cell that does not broadcast system information for MBMS to a cell that does broadcast system information for MBMS, then the UE can receive MBMS service information, but the UE may experience service interruption during the handover process
Solution Approach 1:
The UE transmits the MBMS interest indication message to the source base station before the handover is completed. This preliminary action allows the source base station to forward the message to the target base station in advance, so that when the UE completes handover to the target cell that supports MBMS, the service can be immediately resumed without interruption.
2Reliability
If the UE always transmits MBMS interest indication message during handover, then service continuity is maintained, but unnecessary signaling overhead is generated when handover is between cells of the same MBMS capability
Solution Approach 1:
The UE applies different behaviors based on the local characteristics of the source and target cells. When handover is between cells with different MBMS capabilities (one supporting MBMS and the other not), the UE transmits the MBMS interest indication message. When handover is between cells with the same MBMS capability, the UE does not transmit the message, thereby avoiding unnecessary signaling overhead while maintaining service continuity where needed.
Data Source
AI summary
Provided are a method and an apparatus for transmitting a multimedia broadcast/multicast service (MBMS) interest indication message in a wireless communication system. A user equipment (UE) receives from a first base station system information for an MBMS which is broadcasted, and transmits the MBMS interest indication message to the first base station when the user equipment performs a handover from a second base station, which does not broadcast the system information for the MBMS, to the first base station.