National Conference on Communication and Information Security (NCCIS 2009)
Daffodil International University, Dhaka, Bangladesh, 14 February 2009.
Optimizing the Handover Procedure in IEEE 802.16e
Mobile Wimax Network
Nafiz Imtiaz Bin Hamid and Adnan Mahmud
Department of Electrical and Electronic Engineering (EEE)
Islamic University of Technology (IUT), Boardbazar, Gazipur, Bangladesh
E-mail: nafiz-imtiaz@hotmail.com, adnan903@yahoo.com
Abstract: The mobile WiMAX bearing the IEEE
standard 802.16e-2005 brings wireless broadband
to a new dimension due to the support of
nomadism. As a result, handover has obviously
become a very significant
factor
in
the
performance of mobile WiMAX. But because of
the presence of unnecessary ranging/scanning in
Layer 2 along with the network re-entry
procedure enormous handover latency occurs.
This threatening handover delay is a huge
obstacle for the optimum performance of mobile
WiMAX. In this paper various problematic
scenarios of handover procedure have been shown
with the log file analyzer tool along with
“SlickEdit” using data from a WiMAX trial
network and from that an optimized handoff
scheme is proposed associated with suitable pre-
scanning algorithm, fast dedicated ranging and
pre-registration process.
Keywords: IEEE 802.16e, Mobile WiMAX,
Scanning, Handover
1. Introduction
New and emerging multimedia applications
and broadband remote access are driving the
need for very high-speed wide area Internet
access to mobile devices. Mobile WiMAX
based on IEEE 802.16e-2005 [1] standard is
an amendment of IEEE STD 802.16-2004 [2]
for supporting mobility.
It
is a key
component of broadband wireless strategy for
delivering innovative mobile platforms for
anytime, anywhere Internet connectivity [6].
The mobile WiMAX air interface adopts
Orthogonal Frequency Division Multiple
Access (OFDMA) for improved multi-path
performance in non-line-of-sight (NLOS)
environments. Other advanced features of
802.16e include Adaptive Modulati