Integrating X2 and RRC Signaling for Wireless Handover

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Solution Overview

Problem

The conventional handover process from a macro eNB to a relay eNB in wireless communication systems is inefficient due to the separation of X2 signaling and RRC connection processes, leading to increased message exchange and handover delays, and resource allocation issues between macro and relay eNBs.

Innovation Solution

Integrating X2 signaling and RRC signaling messages for handover requests and responses, with the macro eNB performing call admission control prior to the relay eNB, to reduce unnecessary message exchange and optimize resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If X2 signaling and RRC connection processes are separated, then call admission control can be performed by relay eNB, but the number of messages exchanged increases and handover delay increases

Engineering Contradiction:

Improvecall admission controlVSAvoidhandover delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines X2 signaling message and RRC connection message into a single integrated message exchanged between macro eNB and relay eNB. This merging eliminates the need for separate message exchanges, directly reducing handover delay while preserving call admission control functionality through the integrated signaling process

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If connection is not established between macro eNB and relay eNB, then relay eNB can be accessed, but additional messages (paging, RRC connection setup) must be exchanged

Engineering Contradiction:

Improverelay accessVSAvoidmessage exchange time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent performs call admission control and establishes the radio link connection between macro eNB and relay eNB before the actual handover occurs. This preliminary action ensures the connection is ready in advance, eliminating the need for additional paging and RRC connection setup messages during the handover process

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If RRC connection reconfiguration messages are exchanged, then radio link changes can be managed, but message exchange complexity increases

Engineering Contradiction:

Improveradio link managementVSAvoidsignaling complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent merges RRC connection reconfiguration signaling with X2 handover signaling into a single integrated message exchange. This combination simplifies the overall signaling process by eliminating separate reconfiguration message exchanges, reducing signaling complexity while maintaining radio link management capabilities

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8289928B2Apparatus and method for handover in wireless communication system

Publication Date: 2012.10.16 SAMSUNG ELECTRONICS CO LTD

AI summary

An apparatus and method provide an effective handover of a User Equipment (UE) in a wireless communication system from a macro evolved Node-B (eNB) to a relay eNB). In a method of supporting a handover of a User Equipment (UE) by a macro evolved Node-B (eNB) in a wireless communication system, a handover of the UE to a relay eNB is determined. A handover request and RRC connection setup message is transmitted to the relay eNB by integrating a handover request message for requesting a handover of the UE and an RRC connection setup message for requesting RRC connection setup between the macro eNB and the relay eNB. A handover request response and RRC connection setup response message are received from the relay eNB by integrating a handover request response message and an RRC connection setup response message.