Portable Telephone MBMS Mode Shift for Reliable Reception

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Solution Overview

Problem

Portable telephones using W-CDMA for MBMS services face issues with incomplete data reception due to mode shifts during out-of-range conditions, leading to communication congestion and inability to actively request retransmissions in PtM mode.

Innovation Solution

A portable telephone with a control section that analyzes Layer 3 messages and requests a mode shift to PtP mode for retransmissions by sending specific messages to the network, maintaining PtP mode for continued data reception without increasing communication traffic.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the portable telephone shifts to PtP mode for retransmission requests during MBMS communication, then user information can be received reliably, but communication traffic volume increases causing network congestion

Engineering Contradiction:

Improveuser information reception reliabilityVSAvoidcommunication traffic volume

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the communication mode parameter from PtM to PtP based on reception status. When out-of-range conditions are detected during MBMS communication, the system transitions to PtP mode for retransmission requests, ensuring reliable delivery while managing traffic through conditional parameter adjustment

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If the portable telephone remains in PtM mode during out-of-range conditions, then communication traffic is reduced, but user information cannot be received when returning to range

Engineering Contradiction:

Improvecommunication traffic volumeVSAvoiduser information reception completeness

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent implements dynamic mode switching between PtM and PtP based on real-time reception conditions. The system monitors communication status and actively transitions modes when needed, allowing the portable telephone to request retransmissions in PtP mode when out-of-range conditions occur during MBMS service

Inventive Principle:

Principle #15Dynamics

3Reliability

If the portable telephone actively requests retransmission in PtM mode, then user information can be received, but the current 3GPP specification prohibits such active requests

Engineering Contradiction:

Improveuser information reception completenessVSAvoidcommunication mode flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional approach by requesting retransmission in PtP mode rather than attempting to modify PtM mode behavior. This reverse strategy bypasses specification limitations on active retransmission requests in PtM mode while achieving the same reliability goal

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS8489142B2Portable telephone and communication mode setting method

Publication Date: 2013.07.16 NEC CORP

AI summary

To realize a portable telephone which can always receive the user information via a MBMS service. The portable telephone includes: an antenna for transmitting/receiving radio waves to and from a network; a wireless section for modulating/demodulating radio waves transmitted/received by the antenna; and a control section which has a function of analyzing and processing Layer 3 messages including MBMS related messages demodulated by the wireless section and wherein, upon recognizing that there is user information which has not been received while receiving user information via a MBMS service in the PtM mode, the control section transmits a request to provide the MBMS service in PtP mode to the network via the wireless section.