DTM Handover in Wireless Mobile Systems

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Solution Overview

Problem

Conventional GSM/GPRS/EDGE systems do not support handover procedures during Dual Transfer Mode (DTM), leading to inefficient handover processes and inability to prioritize between Circuit Switched (CS) and Packet Switched (PS) connections, which limits simultaneous data reception and service continuity.

Innovation Solution

A method for performing DTM handover in a wireless mobile communication system, where a mobile station (MS) receives information on neighbor cells, measures signal strengths, and transmits results, and follows a DTM Handover Command message from the network to perform handover procedures, while considering priority settings between CS and PS connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If handover is performed in DTM by releasing PS connection, then CS handover can be executed, but simultaneous CS and PS service reception is lost

Engineering Contradiction:

Improvehandover executionVSAvoidsimultaneous CS and PS service reception

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The handover procedure is segmented into separate CS handover and PS handover processes. The MS can perform CS handover by releasing PS connection, or perform PS handover while maintaining CS connection, allowing flexible service continuity without losing simultaneous reception capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts connection management based on service priority. The MS can selectively maintain or release connections during handover depending on which service (CS or PS) has higher priority, enabling adaptive service continuity

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If conventional handover procedures are used in DTM, then simple implementation is achieved, but service priority cannot be reflected

Engineering Contradiction:

Improvehandover procedure implementationVSAvoidservice priority reflection

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The MS preliminarily determines service priority between CS and PS connections before executing handover. This allows the system to select appropriate handover mode (CS handover or PS handover) in advance, ensuring service priority is reflected without complicating the actual handover execution

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The MS autonomously determines service priority and selects handover mode without requiring complex network control. This self-service approach maintains implementation simplicity while enabling service priority reflection through the MS's own decision-making

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8279830B2Method of performing handover for a dual transfer mode in a wireless mobile communication system

Publication Date: 2012.10.02 LG ELECTRONICS INC

AI summary

A method of performing Dual Transfer Mode (DTM) handover by a mobile station (MS) in a wireless mobile communication system is disclosed. More specifically, the MS receives information of neighbor cells, wherein the information is a list of neighbor cells whose signal strengths the MS should measure and transmits a message including results of the measured neighbor cells. Furthermore, the MS receives a message from a network, wherein the message is a DTM Handover Command message which instructs the MS to perform a DTM handover procedure with one of the neighbor cells. Lastly, the MS performs the DTM handover procedure.