Wireless and mobile communication

QUESTION FIVE [Total: 20 Marks] a. The GSM architecture shown in figure 4 is meant for 2G. Study this figure carefully, indicate the following abbreviation and explain the function of each in the architecture; BSS, HLR, and Auc Radio Ahir interface Ante HER 557cfce ALC VZR BTS SIS BTS BSC PSTN BTS SISC TSDS BTS MS STS BSC OMC BTS Operational Support Set Nesrce Suchen Mobile Station Bare Station Public Netveida Fig 4 AN[6 Marks] b. Vodafone decides to use a digital TDMA scheme which can tolerate a Signal-to-Interference Ratio of 17dB in the worst case. Find the optimal value of the path lost exponent, y for an omnidirectional antenna; assuming i=3 and j=2. Assume that there are six co-channel cells in the first tier, and all of them are at same distance from the mobile. Use suitable approximations. AP [8Marks) c. Explain what you understand by Simplex in wireless communication. Buttress you answer with an example. AN (6 Marks)