Cell Reselection Notification for MBMS Service Coverage
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Solution Overview
Problem
In mobile communication systems, when multiple frequency areas overlap in the same geographical area, user equipment (UE) in cells that do not support packet data services cannot receive multimedia broadcast/multicast services due to inefficient radio resource management, leading to wasted resources and service unavailability.
Innovation Solution
A method is introduced where cell reselection information is notified to UE in non-supporting cells, allowing them to move to and receive services from overlapping cells that do support packet data services, thereby efficiently utilizing radio resources by assigning appropriate radio resources for service reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple frequency areas overlap in the same geographical area, then service coverage is expanded, but radio resource management becomes inefficient and resources are wasted
Solution Approach 1:
The patent applies local quality by enabling UE to access packet data services in specific cells that support the service, while non-supporting cells continue to provide coverage. The network dynamically indicates to UE whether the current cell supports packet data services, allowing service availability to vary locally across different cells in the overlapping frequency areas, thus expanding coverage without wasting resources in cells that cannot support the service.
2Device complexity
If UE remains in non-supporting cells, then cell reselection complexity is reduced, but packet data service availability is lost
Solution Approach 1:
The patent applies preliminary action by having the network pre-indicate to UE whether the current cell supports packet data services before the UE attempts to access the service. This advance information allows UE to proactively perform cell reselection to supporting cells when needed, rather than attempting service access and failing. The network provides this indication through system information or dedicated signaling, enabling UE to make informed decisions about cell reselection.
3Productivity
If radio resources are assigned in non-supporting cells, then resource utilization increases, but service reception fails
Solution Approach 1:
The patent applies the intermediary principle by introducing a cell support indication mechanism that acts as a mediator between the network and UE. This indication system prevents UE from attempting to receive packet data services in non-supporting cells, thereby avoiding wasted radio resources and failed service receptions. The network controller manages this indication information and uses it to guide UE behavior, ensuring that radio resources are only assigned and used in cells that can actually support the packet data service.
Data Source
AI summary
A method for enabling a user terminal to receive packet data in a mobile communication system supporting a packet data service. In the method, a radio network controller receives a session start message from a core network, determines whether or not a frequency area (FA) including the user equipment supports the MBMS service, and transmits a notification message, which contains cell reselection information used when the user equipment moves into an FA supporting the MBMS service, to the user equipment when the user equipment is located in an FA, which does not support the MBMS service.