FullText URL IJNC_7_2_248.pdf
Author Md. Selim Al Mamun| Funabiki, Nobuo| Kyaw Soe Lwin| Md. Ezharul Islam| Kao, Wen-Chung|
Abstract Recently, Wireless Local-Area Network (WLAN) has become prevailing as it provides flexible Internet access to users with low cost through installation of several types of access points (APs) in the network. Previously, we proposed the active AP configuration algorithm for the elastic WLAN system using heterogeneous APs, which dynamically optimizes the configuration by activating or deactivating APs based on traffic demands. However, this algorithm assumes that any active AP may use a different channel from the other ones to avoid interferences, although the number of non-interfered channels in IEEE 802.11 protocols is limited. In this paper, we propose the extension of the AP configuration algorithm to consider the channel assignment to the active APs under this limitation. Besides, AP associations of the hosts are modified to improve the network performance by averaging loads among channels. The effectiveness of our proposal is evaluated using the WIMNET simulator in two topologies. Finally, the elastic WLAN system including this proposal is implemented using Raspberry Pi for the AP. The feasibility and performance of the implementation are verified through experiments using the testbed.
Keywords Elastic WLAN system interference minimization channel assignment active access-point configuration algorithm testbed Raspberry Pi
Published Date 2017-10-04
Publication Title International Journal of Networking and Computing
Volume volume7
Issue issue2
Publisher IJNC Editorial Committee
Start Page 248
End Page 270
ISSN 2185-2839
Content Type Journal Article
language 英語
OAI-PMH Set 岡山大学
File Version publisher
DOI 10.15803/ijnc.7.2_248
Related Url isVersionOf https://doi.org/10.15803/ijnc.7.2_248
FullText URL IJNC_7_2_187.pdf
Author Kyaw Soe Lwin| Funabiki, Nobuo| Taniguchi, Chihiro| Khin Khin Zaw| Md. Selim Al Mamun| Kuribayashi, Minoru| Kao, Wen-Chung|
Abstract Recently, an IEEE 802.11n access point (AP) prevailed over the wireless local area network (WLAN) due to the high-speed data transmission using the multiple input multiple output (MIMO) technology. Unfortunately, the signal propagation from the 802.11n AP is not uniform in the circumferential and height directions because of the multiple antennas for MIMO. As a result, the data transmission speed between the AP and a host could be significantly affected by their relative setup conditions. In this paper, we propose a minimax approach for optimizing the 802.11n AP setup condition in terms of the angles and the height in an indoor environment using throughput measurements. First, we detect a bottleneck host that receives the weakest signal from the AP in the field using the throughput estimation model. To explore optimal values of parameters for this model, we adopt the versatile parameter optimization tool. Then, we optimize the AP setup by changing the angles and the height while measuring throughput. For evaluations, we verify the accuracy of the model using measurement results and confirm the throughput improvements for hosts in the field by our approach.
Keywords Wireless local area network access point setup MIMO throughput estimation model parameter optimization
Published Date 2017-10-04
Publication Title International Journal of Networking and Computing
Volume volume7
Issue issue2
Publisher IJNC Editorial Committee
Start Page 187
End Page 207
ISSN 21852847
Content Type Journal Article
language 英語
OAI-PMH Set 岡山大学
File Version publisher
DOI 10.15803/ijnc.7.2_187
Related Url isVersionOf https://doi.org/10.15803/ijnc.7.2_187