THESIS
2015
xii, 46 pages : illustrations ; 30 cm
Abstract
With the increasing demand for higher performance wireless local area networks (WLANs),
channel bonding was first proposed in IEEE 802.11n protocol to offer a higher data rate by combine
two 20 MHz channels into a 40 MHz channel. It has been further developed in IEEE 802.11ac
protocol to support an even wider bandwidth up to 160 Mhz. Although channel bonding can offer a
higher peak throughput theoretically, many works have demonstrated that channel bonding should
be carefully considered, otherwise it may degrade the aggregated throughput. Thus, how to make an
effective channel bonding decision becomes more and more important. Existing works try to tackle
this issue using different methods. However, most of them either make some strong assumptions
or do this in a centralized mann...[
Read more ]
With the increasing demand for higher performance wireless local area networks (WLANs),
channel bonding was first proposed in IEEE 802.11n protocol to offer a higher data rate by combine
two 20 MHz channels into a 40 MHz channel. It has been further developed in IEEE 802.11ac
protocol to support an even wider bandwidth up to 160 Mhz. Although channel bonding can offer a
higher peak throughput theoretically, many works have demonstrated that channel bonding should
be carefully considered, otherwise it may degrade the aggregated throughput. Thus, how to make an
effective channel bonding decision becomes more and more important. Existing works try to tackle
this issue using different methods. However, most of them either make some strong assumptions
or do this in a centralized manner. In this thesis, we design a distributed and protocol-compatible
channel bonding scheme inspired by the simple observation that a channel bonding decision can be
made based on topology information. For example, channel bonding should be promoted when the
STA is at the centre of the AP and the AP density is low, otherwise channel bonding should be prohibited.
Then, we conduct a measurement with off-the-shelf 802.11 devices to further demonstrate the correctness of our observation in a real-world network environment. Under this observation, we
implement a distributed channel bonding scheme by setting an adaptive channel clear assessment
(CCA) threshold. After that, we conduct a simulation under a typical enterprise scenario. The results
show that our scheme can improve the throughput by 37% and 46% compared to the channel
bonding scheme in 802.11 protocol and CSMA/CA respectively
Post a Comment