MBMS Session Stop Message Dispersion Control

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Solution Overview

Problem

In multimedia broadcast/multicast service systems, user equipments (UEs) concentrated at a preferred frequency are inefficiently dispersed to different frequencies when a session ends, leading to unnecessary power consumption and signaling procedures due to the lack of consideration for the time until the next session starts.

Innovation Solution

A method and apparatus that include time information in a session stop message to determine whether to set a layer dispersion indicator (LDI), allowing UEs to remain at the preferred frequency if the next session starts shortly, thereby preventing unnecessary dispersion and signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If UEs are dispersed to non-preferred frequencies when a session ends, then frequency distribution is improved, but power consumption and signaling overhead increase unnecessarily when the next session starts soon

Engineering Contradiction:

Improvefrequency distributionVSAvoidpower consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary action by including time information about the next session start in the session stop message, allowing UEs to anticipate whether dispersion is necessary before actually dispersing. This enables UEs to remain at the preferred frequency if the next session starts soon, avoiding unnecessary power consumption and signaling.

Inventive Principle:

Principle #10Preliminary action

2Stability of the object's composition

If UEs are dispersed to non-preferred frequencies when a session ends, then frequency distribution is improved, but signaling procedures increase unnecessarily

Engineering Contradiction:

Improvefrequency distributionVSAvoidsignaling overhead

Core Design Contradiction:

Stability of the object's compositionVSLoss of information

Solution Approach 1:

The CRNC performs preliminary action by calculating the time until the next session start and including this information in the session stop message before UEs disperse. This allows the system to determine whether dispersion is actually needed, preventing unnecessary signaling procedures related to measurement, cell re-selection, and frequency changes.

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If time information is included in session stop messages to determine LDI setting, then power consumption is reduced, but message complexity increases

Engineering Contradiction:

Improvepower consumptionVSAvoidmessage complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The system applies parameter changes by adding a time parameter (time until next session start) to the existing session stop message. This single parameter enables the CRNC and UEs to make intelligent decisions about dispersion, reducing power consumption through conditional behavior without requiring complex message structures or multiple additional messages.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8050221B2Method and apparatus for dispersing user equipments to non-preferred frequencies in a multimedia broadcast/multicast service system

Publication Date: 2011.11.01 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and apparatus for dispersing user equipments (UEs) to non-preferred frequencies in a multimedia broadcast/multicast service (MEMS) system is provided. Information regarding a time required until a next session of the MBMS service is started is received. A determination is made as to whether to set a layer dispersion indicator (LDI) in a session stop message, according to the time required until the next session is started. The determined session stop message is sent to the UEs.