MBMS Continuity in Cell Reselection via CSG Detection
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Solution Overview
Problem
Existing cell reselection methods in mobile station apparatuses do not consider whether a CSG cell provides MBMS service, leading to service disruption when a mobile station moves to a CSG cell that does not offer the MBMS service, affecting service continuity.
Innovation Solution
A communication system and method where the mobile station apparatus selects an access-restricted cell based on its ability to continue receiving MBMS service, prioritizing reception quality over priority settings, and autonomously detects accessible CSG cells to ensure continuous MBMS service by selecting cells that can provide the service and meet reselection criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station apparatus selects cells based on priority settings, then the cell reselection follows standard procedures, but the MBMS service continuity is disrupted when moving to CSG cells that do not provide the service
Solution Approach 1:
The mobile station apparatus performs preliminary detection of MBMS service information from CSG cells before reselection. By checking whether the target CSG cell provides the required MBMS service in advance, the device prevents service disruption before it occurs, ensuring reliable MBMS continuity while maintaining standard reselection procedures.
Solution Approach 2:
The mobile station autonomously determines whether to apply MBMS-continuity-based reselection by checking its own service reception status and the MBMS information of detected CSG cells. This self-service mechanism allows the device to independently make reselection decisions that maintain MBMS continuity without requiring complex network control.
2Reliability
If the mobile station apparatus prioritizes MBMS service continuity during cell reselection, then service disruption is prevented, but the complexity of the reselection process increases
Solution Approach 1:
The mobile station apparatus applies different reselection criteria based on local conditions: when the received MBMS service information indicates the CSG cell provides the required service, MBMS-continuity-based reselection is applied; otherwise, standard reselection procedures are used. This localized application of quality criteria maintains reliability while avoiding unnecessary complexity in cases where MBMS continuity is not relevant.
3Reliability
If the mobile station apparatus autonomously detects accessible CSG cells, then the service continuity is maintained, but the detection and measurement process becomes more complex
Solution Approach 1:
The mobile station apparatus performs preliminary detection of MBMS service information from CSG cells during the normal cell reselection process. By integrating this detection into existing measurement procedures rather than adding separate detection steps, the system maintains service continuity while minimizing the increase in detection complexity.
Data Source
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AI summary
Efficient cell reselection taking the continuity of MBMS service into consideration is enabled. A communication system includes a base station apparatus managing a cell capable of providing a multimedia broadcast multicast service, and a mobile station apparatus belonging to a group of access-restricted cells, and the mobile station apparatus selects the access-restricted cell from the serving cell capable of providing the multimedia broadcast multicast service. The base station apparatus periodically transmits multimedia broadcast multicast service information to the mobile station apparatus (S101), and the mobile station apparatus is able to continue the multimedia broadcast multicast service being received from the cell capable of providing the multimedia broadcast multicast service by selecting the access-restricted cell and when a reception quality of the access-restricted cell satisfies cell reselection criteria, selects the access-restricted cell (S105).