Handover Message Decoding for Inter-RAT Transitions

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Solution Overview

Problem

During inter-RAT handovers in wireless communication systems, mobile devices face decoding errors due to the inability to determine the switched type of handover messages, leading to handover failures, particularly when transitioning between UMTS and GSM/GPRS systems or LTE and GSM/GPRS systems.

Innovation Solution

Incorporating a mobile device with means to receive handover messages containing type information, allowing determination of the switched domain type of inter-RAT messages, thereby enabling the use of appropriate decoders for accurate message decoding and preventing handover failures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the mobile device uses multiple decoders to handle different GSM message types, then the capability to support both CS and PS services is improved, but the complexity of message decoding increases due to inability to determine which decoder to use

Engineering Contradiction:

Improvecapability to support both CS and PS servicesVSAvoidcomplexity of message decoding

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The network device performs preliminary action by including type information in the handover message that indicates the switched domain type (CS or PS) of the inter-RAT message. This allows the mobile device to know in advance which decoder to use, eliminating the need to attempt decoding with multiple decoders and thereby reducing decoding complexity while maintaining support for both service types.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the mobile device attempts to decode the inter-RAT message without knowing its type, then the handover procedure can be initiated, but decoding errors occur leading to handover failure

Engineering Contradiction:

Improvehandover procedure initiationVSAvoidhandover success rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The network device provides feedback by including type information in the handover message that indicates the switched domain type of the inter-RAT message. This feedback enables the mobile device to correctly identify and use the appropriate decoder, ensuring accurate message decoding and successful handover execution.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If the handover message includes type information indicating the switched domain type, then the accuracy of message decoding is improved, but the size of the handover message increases

Engineering Contradiction:

Improveaccuracy of message decodingVSAvoidsize of handover message

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The type information is added only to the specific portion of the handover message where the inter-RAT message is embedded, rather than modifying the entire message structure. This localized addition provides the necessary decoding information while minimizing the overall message size increase.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2282579B1Mobile device network for handling handover message decoding

Publication Date: 2016.09.28 HTC CORP

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AI summary

A mobile device (20) of a wireless communication system for handling handover message decoding, the mobile device (20) includes means for via a first radio access technology, RAT, receiving a handover message associated with a handover from the first RAT to a second RAT supporting services of a packet switched, PS), domain and a circuit switched, CS, domain (502), wherein the handover message comprises type information and an inter-RAT message generated based on the second RAT; and means for determining a switched domain type of the inter-RAT message according to the type information (504).