Abstract
The direct link communication between STAtions (STAs) is one of the techniques to improve the MAC performance of IEEE 802.11 infrastructure networks. For the efficient direct link communication, in the literature, the simultaneous polling method was proposed to allow the multiple direct data communication to be performed simultaneously. However, the efficiency of the simultaneous polling method is affected by the interference condition. To alleviate the problem of the lower polling efficiency with the larger interference range, the hybrid polling method is proposed for the direct link communication between STAs in IEEE 802.11 infrastructure networks. By the proposed polling method, we can integrate the sequential and simultaneous polling methods properly according to the interference condition. Numerical examples are also presented to show the medium access control (MAC) performance improvement by the proposed polling method.
Highlights
The fundamental IEEE 802.11 wireless LAN technology was developed to support two PHY data rates of 1 and 2 Mbps in the industrial, science, and medical (ISM) frequency band at 2.4 GHz [1]
The distributed coordination function (DCF) protocol based on carrier sense multiple access with collision avoidance (CSMA/CA) was designed to support the besteffort services in the wireless LAN service environment, and the point coordination function (PCF) protocol based on a polling method was designed for the real-time services such as voice over internet protocol (VoIP)
If one or more direct data transmission opportunities are granted in the direct communication polling interval (DCPI), only one transmission opportunity is granted to each transmitting STA of the direct link communication and two transmission opportunities are granted each to the other STAs in the polling interval (PI) of the SP
Summary
The fundamental IEEE 802.11 wireless LAN technology was developed to support two PHY data rates of 1 and 2 Mbps in the industrial, science, and medical (ISM) frequency band at 2.4 GHz [1]. EURASIP Journal on Wireless Communications and Networking and interference information among the STAs, and the simultaneous polling method to allow the multiple direct data communication to be performed simultaneously. When the interference range is large enough for the data transmission of each STA to interfere with the data receptions of all other STAs in the same wireless LAN, the simultaneous direct data communication is impossible, and the efficiency of the simultaneous polling method will be the same as that of the conventional PCF protocol. The hybrid polling method is proposed for the direct link communication between STAs in IEEE 802.11 infrastructure networks.
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