Uplink Power Control Parameter Transfer During Handover

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Solution Overview

Problem

Handover processes in wireless communication systems often result in delays and incorrect power level settings for mobile units, leading to throughput loss, dropped packets, and quality of service degradation, especially in latency-sensitive applications like VoIP and video telephony.

Innovation Solution

Transmitting uplink power control parameters from the target base station to the mobile unit via the source base station during the handover procedure, allowing immediate proper power setting adjustment upon connecting to the new base station.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the mobile unit waits to obtain power control parameters from the target base station after handover, then the proper power level can be achieved, but transmission delay and throughput loss occur

Engineering Contradiction:

Improvepower level accuracyVSAvoidtransmission delay

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The source base station sends the power control parameters to the mobile unit in advance, before the handover is completed. This preliminary action allows the mobile unit to have the necessary parameters ready immediately upon handover, eliminating the waiting period and associated delays while ensuring accurate power level control.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the mobile unit transmits at the source base station's power setting after handover, then transmission can begin immediately, but excess interference or QoS degradation occurs

Engineering Contradiction:

Improvetransmission continuityVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The power control parameters specific to the target base station are provided to the mobile unit before handover completion through the source base station. This allows the mobile unit to switch to transmitting at the correct power level for the target base station immediately, maintaining transmission continuity while avoiding the harmful effects of using incorrect power settings.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If power control parameters are obtained after handover, then proper power control can be implemented, but latency-sensitive applications suffer from dropped packets

Engineering Contradiction:

Improvepower control accuracyVSAvoidpacket delivery reliability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

By sending the power control parameters from the target base station through the source base station before handover is complete, the mobile unit receives all necessary parameters in advance. This eliminates the gap during handover where proper power control cannot be implemented, ensuring continuous reliable transmission for latency-sensitive applications without packet drops.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2188911B1Transfer of uplink power contorl parameters during handovers

Publication Date: 2011.10.12 ALCATEL LUCENT SA

AI summary

The present invention provides a method for performing handover of a mobile unit from a source base station to a target base station. The source base station determines that a mobile unit should be handed over to the target base station. The target base station transmits uplink power control parameters associated with the target base station to the source base station, which transmits them to the mobile unit.