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What changes GPRS need to acquire while upgrading itself from GSM?

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What changes GPRS need to acquire while upgrading itself from GSM?

(a) A whole new base station

(b) New transceiver at base station

(c) New channel cards

(d) New packet overlay including routers and gateways

The question was asked in class test.

The doubt is from 2.5G in chapter Modern Wireless Communication Systems of Wireless/Mobile

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Correct choice is (d) New packet overlay including routers and gateways

The best I can explain: GPRS requires a GSM operator to install new routers and Internet gateways at the base station along with new software upgrade. New base station RF hardware is not required.

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