Abstract
Wireless Local Area Networks (WLAN), Internet is executed through the transport layer of the Open Systems Interconnect (OSI) model, which consists of two major protocols: 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. These protocols find use in the areas of audio and video streaming, File transfer protocol (FTP), Trivial file transfer protocols (TFTP), and others. This paper focus is on UDP and the determination of the predictability of the upstream link with regard to throughput under some scenarios. The description of UDPupT variation of throughput with SNR of an IEEE 802.11 network were 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 obtain two models, one for each category of user, and these models were analysed and compared to determine if there was information that could be used to understand UDP under these scenarios. Results showed that the variation of throughput with SNR did not have a definable model definition, but comparing the two models showed that the single-user scenario showed better throughput than the multiple-user scenario, with an overall average difference of 14.81 Mbps and a standard deviation of 3.2167 and 1.184, respectively.

Key words: IEEE802.11b/g; Upstream, WLAN, User Datagram Protocol; Throughput, Signal to Noise Ratio