UE MBMS Area Exit Indication for Service Continuity
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Solution Overview
Problem
Current mobile communication systems fail to ensure service continuity for Multimedia Broadcast Multicast Services (MBMS) when a User Equipment (UE) moves from one cell to another, especially when the target cell does not carry the MBMS, leading to interrupted service reception due to the network's lack of knowledge about the UE's new location.
Innovation Solution
A method where the UE determines if it has left an MBMS-capable area by checking signal quality and bit error rates, and sends indication information to the network to set up a new bearer for continued MBMS service, allowing service continuity even when the target cell cannot carry the MBMS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE moves to a target cell without notifying the network, then the UE can freely change cells, but the network cannot ensure service continuity for MBMS
Solution Approach 1:
The UE provides feedback to the network by sending indication information when it detects that the target cell cannot carry the MBMS service. This feedback mechanism allows the network to maintain service continuity by setting up a new bearer, thus resolving the contradiction between UE mobility freedom and MBMS service continuity.
Solution Approach 2:
The UE performs preliminary detection by checking whether the target cell can carry the MBMS service before fully transitioning. Based on this preliminary assessment, the UE decides whether to send indication information, allowing the network to proactively maintain service continuity before complete service interruption occurs.
2Reliability
If the UE sends indication information to notify the network, then MBMS service continuity can be maintained, but the signaling overhead increases
Solution Approach 1:
The UE does not send indication information in all cell transition scenarios, but only when the target cell cannot carry the MBMS service. This partial action approach maintains service continuity only when necessary, reducing unnecessary signaling overhead while ensuring reliability when needed.
Solution Approach 2:
The UE autonomously determines whether the target cell can carry the MBMS service by checking cell configuration information itself, without requiring continuous network assistance. This self-service capability reduces signaling overhead by eliminating the need for network-side service capability verification.
3Reliability
If the UE checks cell configuration information to determine MBMS capability, then service continuity can be maintained, but the processing complexity increases
Solution Approach 1:
The UE extracts only the necessary cell configuration information related to MBMS service capability from the target cell, rather than processing all cell parameters. This extraction approach maintains service continuity by focusing on critical information while reducing processing complexity.
Data Source
AI summary
Provided are a method and device for sending indication information, and UE. In the method, a UE sends to a network side, when determining that the UE has left an MBSFN area capable of carrying a predetermined MBMS, indication information for triggering the network side to set up a bearer for the UE to transmit the predetermined MBMS. The technical problem in the related art that a network side usually fails to know that UE moves to a cell unable to carry an MBMS, so that the network side cannot ensure service continuity and thus reception of the MBMS by a user side is interrupted is solved. The network side knows in time that the UE has left the MBSFN area capable of carrying the predetermined MBMS that is being received or is prepared to be received, and the network side can take measures in time to ensure MBMS continuity.