Throughput Analysis of IEEE 802.11 WLANs with Inter-Network Interference

• Published in: Applied sciences Vol. 10; no. 6; p. 2192
• Main Authors: Liu, Jingwei, Aoki, Takumi, Li, Zhetao, Pei, Tingrui, Choi, Young-june, Nguyen, Kien, Sekiya, Hiroo
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.03.2020
• Subjects: Access control; carrier-sensing; Computer simulation; ieee 802.11; interference; Internet; Local area networks; Network topologies; throughput analysis; Wireless access points; Wireless networks; wlan
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app10062192

Recently, we often see the environment where many one-to-one Wireless Local Area Networks (WLANs) exist in a small area. In this environment, the network throughput of certain WLAN reduces significantly because of the interference from other networks (i.e., inter-network interference). The inter-network interference is the effect of carrier-sensing activities when there are ongoing transmissions in neighbor networks. This paper presents analytical expressions using airtime concept, which newly take into account the inter-network interference, for network throughputs of WLANs. There are existing works that similarly address the WLAN’s carrier-sensing duration. However, they either consider a simple interference model or assume the simultaneous transmission time is negligible. Different from them, we consider the significant impact of simultaneous transmission. As a result, our analytical model can precisely express each network carrier-sensing duration by subtracting the simultaneous transmission time. More specifically, we have successfully obtained each network throughput by expressing frame-existence probabilities concerning each network’s End Device (ED). We also confirm the validity of the analysis by comparison with simulation. The analytical results and the simulation results agree well.