I) Write Erlang C formula. Mention its uses in traffic engineering.II) Compare FDMA and OFDMA?III) Explain briefly about requirements of LTE. Also describe the challenges of OFDM-MIMO in LTE. IV)...

I) Write Erlang C formula. Mention its uses in traffic engineering. II) Compare FDMA and OFDMA? III) Explain briefly about requirements of LTE. Also describe the challenges of OFDM-MIMO in LTE. IV) What is Cell Relay? Give applications. V) Explain briefly about a text based protocol for VoIP.