期刊名称：Lecture Notes in Engineering and Computer Science
印刷版ISSN：2078-0958
电子版ISSN：2078-0966
出版年度：2018
卷号：2235&2236
页码：409-414
出版社：Newswood and International Association of Engineers
摘要：In WiFi, the algorithm used to choose the best
candidate Access Point can vary from vendor to vendor,
however it always involves the analysis of the Received Signal
Strength Indication (RSSI) value. The simplest algorithm that
can be implemented consists in choosing the Access Point that
has the highest RSSI value. However, such an algorithm can
lead to bad choices, for example when the Access Point with
the best RSSI value has too many clients associated to it,
which will be sharing the available bandwidth, while a further
Access Point (with lower RSSI value) has no clients connected
to it. Probably in this case the latter might offer a better
network performance. To assess which is the best Access Point
to connect to, in this paper it is presented a simple algorithm
that is based in the network delay. Before choosing the best
Access Point, the mobile station measures the network delay
of the available Access Points, and chooses that with the lower
delay. Te drawback is that this cannot be done off-channel, a
connection must be made to the Access Point for the delay to
be measured. Nevertheless, taking into consideration that that
the overall network performance will be better, and if the user
is using a nomad equipment (such as a laptop), this method
is feasible. Results show that using network delay will lead to
better choices. In one of the testing scenarios presented in this
work, the method based on the network delay was able to obtain
more than the double of best decisions in comparison to that
using RSSI values (87.50% against 41.67%).
关键词：WiFi; IEEE802.11; NTP; handoff; network;
delay; access point selection
