MBMS Cell Reselection Using Proactive Neighbor Control Data Storage
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Solution Overview
Problem
In MBMS mobile communication systems, user equipment (UE) experiences delays during cell reselection, leading to disruptions in seamless service delivery when moving between cells, as it takes time to acquire necessary information about target cells.
Innovation Solution
The UE proactively stores MBMS control information for neighboring cells, including configuration and control data for accessing MBMS control and data transport channels, allowing for efficient cell reselection by consulting stored information when moving to a target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE acquires target cell information during cell reselection, then the UE can maintain MBMS service continuity, but the service delivery is delayed due to the time required to acquire information
Solution Approach 1:
The UE proactively acquires and stores MBMS control channel configuration information of neighbor cells before cell reselection occurs. By performing this information acquisition in advance while still in the serving cell, the UE eliminates the need to delay service reception during the actual cell reselection process, thus maintaining service continuity without time loss
2Speed
If the UE stores MBMS control information for neighbor cells, then cell reselection delay is reduced, but the device complexity increases due to additional information storage requirements
Solution Approach 1:
The UE extracts and stores only the essential MBMS control channel configuration information from neighbor cells, such as physical channel parameters and logical channel configurations, rather than storing all possible cell information. This selective extraction reduces the storage burden and complexity while still enabling fast cell reselection for MBMS services
Data Source
AI summary
A cell reselection method by a user equipment (UE) receiving an MBMS service in a serving cell of a mobile communication system. The UE receives control data of the serving cell, including configuration information necessary for accessing MBMS control channels (MCCHs) of neighbor cells and control information necessary for accessing an MBMS data transport channel (MTCH) of the serving cell, over an MCCH of the serving cell, and stores the received control data, while the MBMS service is provided in the serving cell. If cell reselection to a target cell, which is one of the neighbor cells is determined, the UE moves to the target cell by utilizing configuration information stored for the target cell.