JOURNAL OF NETWORKS (JNW)
ISSN : 1796-2056
Volume : 4    Issue : 3    Date : May 2009

A New Soft Handover Mechanism using DCHs in 3GPP HSDPA Networks
TaeHoon Lee, SungHoon Seo, UiTaek Lee, and JooSeok Song
Page(s): 184-191
Full Text:
PDF (968 KB)


Abstract
In 3GPP (Third Generation Partnership Project) Release 5 (R5), HSDPA (High-Speed Downlink
Packet Access) has been standardized to enhance the data rate of downlink packet transmission
on top of WCDMA (Wideband Code Division Multiple Access) network. Even HSDPA supports up to
10 Mbps data rate through HSDSCHs (High Speed-Downlink Shared Channels), an UE (User
Equipment) suffers from significant handover latency since HSDPA standard lacks supporting soft
handover. Therefore, in this paper, we propose a new soft handover mechanism for HSDPA to
reduce the handover latency by utilizing DCH (Dedicated Channel) instead of HS-DSCH. Simulation
results show that the proposed soft handover mechanism reduces the packet IAT (Inter Arrival
Time) less than 15 msec while HSDPA’s hard handover suffers from 190 msec packet IAT. It
means that the proposed mechanism guarantees the minimum packet IAT requirement of the
typical VoIP service in 20 msec. Furthermore, the proposed mechanism employees no service
disruption for the data connection while an UE performs the soft handover procedure.

Index Terms
Soft Handover, 3GPP, HSDPA, HS-DSCH, DCH, WCDMA