Comparison of UDPUPT for Single and Multiple Users Models in IEEE802.11b/g WLANs

Abstract

Wireless Local Area Networks (WLAN) and the Internet are executed through the transport layer of the Open Systems Interconnect (OSI) model, which consists of two major protocols: The User Datagram Protocol (UDP) and the Transmission Control Protocol (TCP). In terms of the initial connection, TCP has a reliable data connection, while UDP has an unreliable data connection. This paper focuses on UDP and the determination of the predictability of the upstream link with regard to throughput under some scenarios. The description of User Datagram Protocol upstream throughput (UDPupT) variation of throughput with signal to noise ratio (SNR) of an IEEE 802.11 network was developed, compared, and analysed in two scenarios: one with a single user on the network performing selected categories of traffic scenarios constituting upload operations, and the second with multiple sets of users carrying out the same categories of activities on upload operations. The experimental data obtained under these conditions was used to develop a model. The models developed were analysed and compared. The results showed that the variation of throughput with respect to SNR did not have a definable model definition due to UDP being erratic in nature. The model comparison showed that the single-user scenario showed better throughput performance with an overall average difference of 14.81 Mbps compared to the multiple-user scenario. This gives a standard deviation of 3.2167 and 1.184, respectively. However, the result shows that throughput decreases as the number of users increases on the channel.