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|Title: ||IEEE 802.11e QoS enhancements for efficient internetworking with UMTS|
|Authors: ||Rikli, Nasser-Eddine|
Al-Rashed, Mohammed A.
|Keywords: ||QoS enhancements|
|Issue Date: ||18-Feb-2009 |
|Abstract: ||The goal of the next-generation access network is to offer users the capability of
achieving anywhere and anytime network access with high data rate. Instead of
developing the existing UMTS network using different methods (like cell sectoring,
reducing the cell size, etc), the evolvement trend is to internetwork different access
networks. However, Internetworking between WLAN and cellular in general, and
IEEE802.11e and UMTS in particular, is a big challenge in the development of fourth
generation wireless networks. This internetworking is useful to enhance the network
operation, and reduce installation cost. UMTS cannot be replaced by WLAN but these
two networks can be used to compensate some limitations on them. For instance,
WLAN cannot cover wide areas as UMTS, but it can provide high-speed
communication with low cost of installation.
There are many aspects involved in this internetworking, such as mobility
management, security support, and quality of service (QoS) provisioning. This thesis
concentrates on the third aspect which is QoS and especially packet level QoS. The
UMTS provides better QoS than IEEE802.11e especially for real time applications like
voice. However, the goal is to unify the QoS provided by UMTS and IEEE802.11e.
This goal can be met after studying the UMTS QoS and map it in the IEEE802.11e.
Thus, this thesis proposes a new method to enhance the QoS of IEEE 802.11e
especially for real time applications which is buffering method. This method introduces
a modification in EDCF protocol based on setting a fixed time limit after which all
packets that exceed it are dropped. Buffering method can be realized by add buffers at
the station side and the AP side.
Buffering method will be measured using an analytical tool based on Markov
chains. In this thesis, we will develop a three dimensional MC that describes the station
state. This MC is an enhanced one from an existence two dimensional MC. This thesis follows six phases to enhance IEEE 802.11e QoS and map UMTS
QoS in IEEE 802.11e which are: First phase, studying the QoS in UMTS. Second
phase, investigate IEEE 802.11e capability. Third phase, studying the main
internetworking challenges. Fourth phase, propose a method to enhance IEEE 802.11e
QoS. Fifth phase, propose an analytical model to measure the buffering method. Sixth
method, presentation and discussion of the results.|
|Description: ||This study has been conducted & Submitted in partial fulfillment of the requirement for the Master's degree in Department of Computer Engineering at the College of Computer Science King Saud University 23/02/1430H - 18 Feb 2009G|
|Appears in Collections:||College of Engineering|
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