MBMS Service Continuity for Non-Handover UEs
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Solution Overview
Problem
Existing MBMS service continuity mechanisms fail to provide continuous multimedia broadcast multicast services to UEs that do not support handover or measurement reporting, as they cannot handover or receive MBMS services when an interest indication message is transmitted.
Innovation Solution
A method and apparatus for supporting MBMS service continuity in UEs by entering an RRC state where cell reselection is not supported, determining if the MBMS service of interest can be received from the serving frequency, and transmitting an MBMS interest indication message to the network when it cannot, allowing the UE to perform cell reselection to a neighboring cell providing the MBMS service via MBSFN or SCPTM transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a UE does not support handover or measurement reporting, then the device complexity is reduced and ease of operation is improved, but MBMS service continuity cannot be maintained when the UE moves to a neighboring cell
Solution Approach 1:
Instead of using handover (network-controlled cell change) for UEs that cannot perform handover, the patent inverts the approach by using cell reselection (UE-autonomous cell change) mechanism. The UE autonomously monitors neighboring cells and switches to a target cell providing MBMS service without network coordination, thereby maintaining service continuity for simplified UEs.
Solution Approach 2:
The patent introduces an MBMS interest indication message as an intermediary mechanism. The UE sends this message to indicate its interest in MBMS services, and the network responds with appropriate cell reselection parameters. This intermediary communication enables service continuity without requiring full handover capability.
2Area of stationary object
If MBSFN area configuration is static and occupies full system bandwidth, then service coverage is improved, but radio resource utilization efficiency deteriorates
Solution Approach 1:
The patent makes the MBSFN area configuration dynamic by allowing the network to adjust the MBSFN area based on UE distribution and service demand. Instead of a fixed static configuration, the MBSFN area can be expanded or contracted, and bandwidth allocation can be adjusted dynamically to match actual service requirements, reducing resource waste while maintaining coverage.
Solution Approach 2:
The patent changes the parameters of MBSFN configuration including bandwidth allocation, subframe configuration, and area scope based on traffic load and UE distribution. By dynamically adjusting these parameters, the system maintains adequate service coverage while avoiding unnecessary resource occupation in low-demand areas.
3Device complexity
If MBSFN subframe configuration is static, then configuration simplicity is improved, but adaptability to traffic load changes deteriorates
Solution Approach 1:
The patent introduces dynamic adjustment of MBSFN subframe configuration based on traffic load. The network can increase or decrease the number of MBSFN subframes allocated depending on service demand, allowing the system to adapt to varying traffic conditions while maintaining a relatively simple base configuration structure.
Data Source
AI summary
Provided are a method for supporting multimedia broadcast multicast service (MBMS) service continuity by a terminal in a wireless communication system and an apparatus supporting the same. The method may comprise the steps of: entering an RRC state in which cell reselection is not supported; determining whether an MBMS service of interest can be received at a serving frequency for the terminal; and when it is determined that the MBMS service of interest cannot be received at the serving frequency, transmitting an MBMS interest indication message to a network, wherein the terminal may be a terminal not supporting a handover.