NS-2 network performance evaluation of Abis interface over DVB-S2 in the GSM over satellite network

This paper deals with establishing GSM link over Satellite. Abis interface, which is defined between Base Transceiver Station (BTS) and Base Station Controller (BSC), in a GSM network is considered here to be routed over the Satellite. The satellite link enables a quick and cost effective GSM link in meagerly populated areas over an existing Handset. Simulation of Abis over Satellite link was done with the help of discrete event simulation platform NS-2.33, which is an open source network simulator with C++ used for detailed structure definition and TCL as interpreter for scripting programming language. The concatenation of these programming languages gives flexibility in different protocols implementation, efficiency and reduces programming lines. We have implemented an Abis interface over DVB S2 in NS2 and evaluated the performance over the high delay and loss satellite channel. Network performance was evaluated with respect to Satellite channel delay and DVB S2 encapsulation efficiency under different amount of user traffic and compared with the terrestrial scenario. The results clearly showed an increase amount of logical channels required in the case of satellite channel scenario for the same amount of traffic in comparison to conventional terrestrial scenario. We have optimized the parameters based on the simulation results.