Base Station Handover Delay for VoIP Bearer Setup

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Solution Overview

Problem

In wireless communication systems, VoIP call setup procedures often fail during handovers due to the base station not being aware of the VoIP call setup process, leading to delays and failed bearer setups.

Innovation Solution

Implementing a method where the base station detects VoIP call setup requests through string matching and delays the handover procedure by setting a handover delay timer, ensuring the VoIP bearer is set before proceeding with the handover, and allowing the terminal to inform the base station of session setup requests via explicit signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the base station proceeds with handover procedure when VoIP call setup is in progress, then handover speed is improved, but VoIP bearer setup fails and service continuity deteriorates

Engineering Contradiction:

Improvehandover speedVSAvoidVoIP bearer setup success

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The base station detects VoIP call setup requests in advance and sets a handover delay timer before the actual handover occurs. This preliminary detection and timing mechanism ensures that handover is postponed until VoIP bearer setup is complete, preventing setup failures while maintaining efficient handover execution when conditions are favorable.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the base station delays handover procedure to wait for VoIP bearer setup, then VoIP bearer setup success is improved, but handover time is increased

Engineering Contradiction:

ImproveVoIP bearer setup successVSAvoidhandover time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station performs preliminary detection of VoIP call setup requests and initiates the handover delay timer in advance. This allows the system to proactively manage the timing relationship between VoIP setup and handover, ensuring successful bearer setup while minimizing unnecessary delays by triggering handover as soon as VoIP setup is complete.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The base station continuously monitors the VoIP call setup status and adjusts handover timing based on this feedback. When VoIP bearer setup is detected as complete, the base station cancels the handover delay timer and proceeds with handover if conditions are favorable. This feedback mechanism ensures optimal timing that balances reliability with time efficiency.

Inventive Principle:

Principle #23Feedback

3Device complexity

If the base station does not detect VoIP call setup requests, then device complexity is reduced, but service continuity deteriorates due to failed bearer setup

Engineering Contradiction:

Improvebase station detection mechanismVSAvoidservice continuity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The base station utilizes its existing message processing capabilities to detect VoIP call setup requests without requiring separate complex detection mechanisms. By examining messages passing through the base station, the system achieves self-service detection that maintains service continuity while avoiding significant increases in device complexity.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS10257234B2Method and apparatus for controlling handover procedure in wireless communication system

Publication Date: 2019.04.09 SAMSUNG ELECTRONICS CO LTD

AI summary

A method is provided for controlling a handover procedure in a wireless communication system. In a method for operating a base station, whether a session setup request for a voice call of a terminal occurs is determined. If a handover request from the terminal occurs within a time period after the session setup request occurs, triggering of a handover procedure is delayed.