Throughput Improvement of Mobile Cooperative WLAN Systems with Identifying and Management of Starved APs/UEs for 5G

Akiyoshi INOKI  Hirantha ABEYSEKERA  Munehiro MATSUI  Kenichi KAWAMURA  Takeo ICHIKAWA  Yasushi TAKATORI  Masato MIZOGUCHI  Akira KISHIDA  Yoshifumi MORIHIRO  Takahiro ASAI  Yukihiko OKUMURA  

IEICE TRANSACTIONS on Communications   Vol.E100-B    No.8    pp.1366-1376
Publication Date: 2017/08/01
Publicized: 2017/04/17
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016FGP0017
Type of Manuscript: Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Terrestrial Wireless Communication/Broadcasting Technologies
5G,  wireless LAN,  throughput starvation,  CSMA/CA,  

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Efficient use of heterogeneous wireless access networks is necessary to maximize the capacity of the 5G mobile communications system. The wireless local area networks (WLANs) are considered to be one of the key wireless access networks because of the proliferation of WLAN-capable mobile devices. However, throughput starvation can occur due to the well-known exposed/hidden terminal problem in carrier sense multiple access with collision avoidance (CSMA/CA) based channel access mechanism, and this problem is a critical issue with wireless LAN systems. This paper proposes two novel schemes to identify starved access points (APs) and user equipments (UEs) which throughputs are relatively low. One scheme identifies starved APs by observing the transmission delay of beacon signals periodically transmitted by APs. The other identifies starved UEs by using the miscaptured beacon signals ratio at UEs. Numerous computer simulations verify that that the schemes can identify starved APs and UEs having quite low throughput and are superior to the conventional graph-based identification scheme. In addition, AP and UE management with the proposed schemes has the potential to improve system throughput and reduce the number of low throughput UEs.