Hybrid WLAN for Data Dissemination Applications
Date Issued
2004
Date
2004
Author(s)
Lin, Ching-Ju
DOI
20060927122912101416
Abstract
In traditional infrastructure-based IEEE 802.11 wireless
LAN network, all the mobile nodes associated themselves
with an access point (AP) share the same wireless channel
with other mobile devices. In such wireless network environ-ment,
there are two major inefficiencies: (a) load imbalance
among different APs: when the distribution of the location
of mobile nodes is non-uniform, this might result in a situ-ation
where a lot of mobile nodes access a single AP and
the rest of APs are idle, and (b) poor resource utilization:
most of the mobile nodes contend for the wireless channels
of APs while there are some unused and available wireless
channels, which can be used to set up ad hoc groups. In this
paper, we propose the hybrid WLAN (H-WLAN) framework
to address these two problems. First, our H-WLAN frame-work
provides the adaptive service selection module for the
mobile node to figure out a better wireless channel and the
server to get its service. Second, the popularity-aware chan-nel
management module is able to efficiently integrate the
ad hoc mode with the infrastructure mode by allowing mo-bile
nodes to set up a new ad hoc group and then share their
resources with other nodes within that group. The simula-tion
results show that our H-WLAN framework can substan-tially
(a) achieve high utilization and load balance among
wireless channels with lower control overhead, and (b) pro-vide
better quality of service for the mobile nodes.
of the operation mode in WLAN is the infrastructure
mode, where each mobile node associates itself with an ac-cess
point (AP) within its direct transmission range. The
AP is connected to a wired network and provides a conduit
to the external network for the mobile nodes.
Publisher
臺北市:國立臺灣大學資訊工程學系
Type
other
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