MBMS Service Information Transfer in Mobile Relocation

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Solution Overview

Problem

In mobile communication systems, the target Radio Network Controller lacks relevant information about MBMS services during relocation, leading to incorrect determination of data transfer methods and failure in notifying radio terminals about data transfer, resulting in incomplete data delivery.

Innovation Solution

The relevant information of the MBMS service joined by the radio terminal is transferred to the target Radio Network Controller during relocation using Relocation Required, Relocation Request, and Relocation Commit messages, ensuring correct storage and notification of data transfer methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the target Radio Network Controller does not receive MBMS service information during relocation, then the relocation process is simpler and faster, but the data transfer method determination becomes incorrect and notification fails

Engineering Contradiction:

Improverelocation speedVSAvoiddata transfer determination accuracy

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The source Radio Network Controller performs preliminary action by including MBMS service information in the Relocation Required message before the relocation occurs. This ensures the target RNC receives the information in advance, allowing correct determination of data transfer methods without delaying the relocation process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The Relocation Required message acts as an intermediary carrier that transfers MBMS service information from the source RNC to the target RNC. This intermediary mechanism enables reliable information transfer during the relocation process without requiring separate communication channels.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If MBMS service information is transferred via Relocation Required message, then the target RNC can correctly determine data transfer method, but the message structure becomes more complex

Engineering Contradiction:

Improvedata transfer determination accuracyVSAvoidmessage structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The MBMS service information is merged into the existing Relocation Required message structure rather than being transmitted as a separate message. This combining approach ensures reliable information transfer while avoiding the overhead of additional message protocols and reducing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The Relocation Required message is enhanced to serve multiple functions: it continues to handle the primary relocation signaling while also carrying MBMS service information. This multi-functionality eliminates the need for dedicated message types, simplifying the overall messaging architecture.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS7961662B2Mobile communication system and MBMS service relevant information transfer method for use therewith

Publication Date: 2011.06.14 NEC CORP

AI summary

The present invention provides a mobile communication system in which a target Radio Network Controller can decide the PtP method or PtM method correctly, and notify that the contents data of an MBMS service starts to be transferred to the radio terminal. A source Radio Network Controller sets up the relevant information of the MBMS service joined by a radio terminal in a Relocation Required message, and transmits it to an SGSN4. The SGSN4 transmits a Relocation Request message to the target Radio Network Controller. The target Radio Network Controller sets up the radio resources to perform the communication with the radio terminal, and stores the relevant information of the MBMS service in the Relocation Required message in memory.