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Browse Prior Art Database

REDUCED HANDOVER MARGIN FOR CONGESTED NETWORKS

IP.com Disclosure Number: IPCOM000009584D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Sep-04
Document File: 1 page(s) / 56K

Publishing Venue

Motorola

Related People

Lucy Goudie: AUTHOR

Abstract

An arrangement whereby once a number of RxQual handovers have been triggered and blocked, a reduction in the margin is applied therefore improving the probability that an uncongested target becomes available. This could be achieved by intro- ducing two additional parameters, a threshold to determine how many times a handover triggered should occur and an additional margin to determine how great a reduction in signal strength is accept- able. This mechanism is illustrated in Figure 1.

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Developmenu Technical 0 M MOTOROLA

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REDUCED HANDOVER MARGIN FOR CONGESTED NETWORKS

by Lucy Goudie

   TCH Blocking is common is GSM networks. There are some features already available to relieve blocking and improve trunking efficiency. These are generally configured to aid call set up attempts and not to address the issue of incoming handovers being blocked.

  Where this occurs calls can continue on a poor serving cell, experiencing bad audio quality and high BER, until eventually the subscriber discon- nects the call or the call drops.

  RxQual handovers, based on high BER, are often configured to take place only to cells where the signal strength at the target is at least equal to that of the serving cell. In cases where valid target cells. at eaual streneth. are unavailable due to con-

  An arrangement whereby once a number of RxQual handovers have been triggered and blocked, a reduction in the margin is applied therefore improving the probability that an uncongested target becomes available. This could be achieved by intro- ducing two additional parameters, a threshold to determine how many times a handover triggered should occur and an additional margin to determine how great a reduction in signal strength is accept- able. This mechanism is illustrated in Figure 1.

  The trigger threshold should be set so that a hand- over has been required for sufficiently long to make a last ditched attempt to save the call worthwhile and the margin not so large that the call has no...