MBMS Interest Indication Reporting for LTE Handover Accuracy
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Solution Overview
Problem
Current multimedia broadcast/multicast (MBMS) services in LTE systems face challenges in ensuring continuity and accuracy of service handover, particularly due to changes in MBMS auxiliary information, handover events, RRC re-establishment, and carrier configuration modifications, which can lead to incorrect handovers and service disruptions.
Innovation Solution
A method and system for reporting a service indication message that allows user equipment to notify the base station of changes in MBMS interest indications in scenarios such as modified auxiliary information, handovers, RRC re-establishment, and carrier configuration changes, ensuring accurate handover to cells supporting the selected MBMS frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MBMS handover is performed based on stored MBMS interest indication without updating, then handover speed is improved, but handover accuracy deteriorates leading to incorrect handovers
Solution Approach 1:
The system performs preliminary actions by storing MBMS interest indication in advance and using it during handover. The network device stores the MBMS interest indication of the terminal before handover occurs, and retrieves this stored information during the handover process to quickly determine the target cell, thereby achieving fast handover while maintaining accuracy through the pre-stored accurate interest indication data.
2Measurement precision
If MBMS interest indication is updated in all scenarios, then handover accuracy is improved, but signaling overhead increases
Solution Approach 1:
The system applies local quality by updating MBMS interest indication selectively based on specific scenarios rather than uniformly in all cases. The patent identifies five specific scenarios (RRC connection release, handover, cell change, service start, service end) where updates are performed, avoiding unnecessary updates in other scenarios. This selective update approach maintains handover accuracy when needed while reducing signaling overhead by avoiding redundant updates.
3Loss of information
If MBMS interest indication is not updated after auxiliary information changes, then signaling overhead is reduced, but service continuity deteriorates
Solution Approach 1:
The system implements feedback by monitoring changes in MBMS auxiliary information and triggering updates to MBMS interest indication accordingly. When the network device detects that MBMS auxiliary information has changed (such as MBMS service configuration changes), it triggers an update of the terminal's MBMS interest indication to reflect the new conditions, ensuring service continuity while avoiding unnecessary updates when auxiliary information remains unchanged.
Data Source
AI summary
A method and terminal for reporting a Multimedia Broadcast Multicast Service (MBMS) interest indication is provided. The method includes a terminal (having a transmitter) sending an MBMS interest indication to a base station upon a change of priority between an MBMS carrier and a unicast carrier, where the MBMS interest indication includes an MBMS frequency selected by the terminal.