TY - GEN

T1 - Adaptive hard handoff algorithms

AU - Prakash, Rajat

AU - Veeravalli, Venugopal V.

PY - 1999

Y1 - 1999

N2 - The design of hard handoff algorithms based on optimizing the tradeoff between link quality and rate of handoffs is considered. For handoff algorithms based on this criterion, adaptation is precisely defined in terms of remaining on a locus of desirable operating points as system parameters (such as mobile velocity) change. A role based on a linear cost criterion is used to select desirable operating points. For this rule, it is shown that the optimal handoff algorithm, which is impractical, is easily adapted by fixing a single tradeoff parameter at an appropriate value. The same adaptation property is shown to hold for an easily implementable approximation to the optimal algorithm, the locally optimal (LO) handoff algorithm. This is in contrast to the poor adaptation of hysteresis based approaches which require complicated look-up tables for adaptation. Practical estimators for all relevant system parameters based only on a short window of pilot signal strength measurements are also discussed. It is shown that the LO algorithm adapts well when these simple estimators are used.

AB - The design of hard handoff algorithms based on optimizing the tradeoff between link quality and rate of handoffs is considered. For handoff algorithms based on this criterion, adaptation is precisely defined in terms of remaining on a locus of desirable operating points as system parameters (such as mobile velocity) change. A role based on a linear cost criterion is used to select desirable operating points. For this rule, it is shown that the optimal handoff algorithm, which is impractical, is easily adapted by fixing a single tradeoff parameter at an appropriate value. The same adaptation property is shown to hold for an easily implementable approximation to the optimal algorithm, the locally optimal (LO) handoff algorithm. This is in contrast to the poor adaptation of hysteresis based approaches which require complicated look-up tables for adaptation. Practical estimators for all relevant system parameters based only on a short window of pilot signal strength measurements are also discussed. It is shown that the LO algorithm adapts well when these simple estimators are used.

UR - http://www.scopus.com/inward/record.url?scp=0032624788&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032624788&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0032624788

SN - 0780354354

T3 - IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall

SP - 1779

EP - 1783

BT - IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall

T2 - IEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall

Y2 - 19 September 1999 through 22 September 1999

ER -