Radio Resource Control Reestablishment in Heterogeneous LTE Networks

Solution Overview

Problem

In heterogeneous LTE networks with complex cell deployments, the existing re-establishment technologies for radio resource control connections have a low success rate due to increased interference and complexity, making it difficult to predict and manage radio link failures effectively.

Innovation Solution

A method where the source base station proactively sends context information of a user equipment to neighboring base stations capable of establishing a radio resource control connection, allowing the user equipment to select a neighboring cell with acceptable signal quality for re-establishment after a radio link failure, thereby increasing the success rate of re-establishing the connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing re-establishment technology is used in heterogeneous networks, then the network deployment flexibility is improved, but the re-establishment success rate deteriorates

Engineering Contradiction:

Improvenetwork deployment flexibilityVSAvoidre-establishment success rate

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The source base station performs preliminary actions by determining neighboring cells and sending context information to them before radio link failure occurs. This advance preparation ensures that when failure happens, the target base station already has the necessary user equipment context information ready, significantly improving re-establishment success rate in heterogeneous networks while maintaining deployment flexibility

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If base stations are densely deployed in heterogeneous system, then network coverage is improved, but interference distribution becomes unpredictable

Engineering Contradiction:

Improvenetwork coverageVSAvoidinterference distribution complexity

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The invention changes the approach from trying to manage and predict interference patterns to using a robust re-establishment mechanism that works regardless of interference conditions. By sending context information to multiple neighboring base stations in advance and allowing selection based on current signal quality, the system adapts to varying interference conditions without requiring complex interference management

Inventive Principle:

Principle #35Parameter changes

3Productivity

If base stations are densely deployed in heterogeneous system, then network capacity is improved, but the number of radio link failures increases

Engineering Contradiction:

Improvenetwork capacityVSAvoidradio link failure rate

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The source base station performs preliminary actions by determining neighboring cells and sending context information to them before radio link failure occurs. This advance preparation ensures that when failure happens, the target base station already has the necessary user equipment context information ready, significantly improving re-establishment success rate in heterogeneous networks while maintaining deployment flexibility

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2763461B1Radio resource control connection reestablishment method

Publication Date: 2017.05.31 HUAWEI TECH CO LTD

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AI summary

The present invention discloses a method for re-establishing a radio resource control connection, including: determining, by a source base station that controls a source cell in which a user equipment is located, at least one neighboring cell; and in a case that the user equipment does not meet a cell handover condition, sending, by the source base station, context information of the user equipment to a base station controlling the at least one neighboring cell. A success rate of re-establishing a radio resource control connection for the user equipment in the present invention is relatively high.