By Topic

Effects of soft handover on the UMTS downlink performance

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
D. Staehle ; Dept. of Comput. Sci., Wurzburg Univ., Germany ; K. Leibnitz ; K. Heck

The 3GPP standard proposes two methods to perform soft handover on the downlink. In the first one all base stations (BS) or node-B belonging to the active set (AS) transmit simultaneously to the mobile station (MS). All these signals are added at the MS using maximal ratio combining. The downlink power control adjusts the BS transmit powers such that the Eb.No achieved by maximal ratio combining reaches the desired target Eb/No. According to the 3GPP standard all BS in the AS transmit with an equal power to the MS. The other possibility to perform soft handover is called site selection diversity. In this case a single BS of the AS is selected and only this BS transmits to the MS while all other BS in the AS switch their power off. The advantage of this strategy is that the other BS in the AS produce no interference while the benefits of soft handover are maintained by fast site selection. If the radio link quality drops abruptly due to fading effects the MS can switch rapidly to another BS. In this paper we analytically compare the two methods with respect to the system capacity. Furthermore, we investigate soft handover mechanisms that allocate not necessarily equal proportions of the total power to the BS in the AS. These mechanism provide a compromise between equal power allocation and SSDT.

Published in:

Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th  (Volume:2 )

Date of Conference: