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How does HSCSD differs from the GSM to obtain higher speed data rate?

(a) By allowing single user to use one specific time slot

(b) By allowing single user to use consecutive user time slots

(c) By using 8-PSK modulation technique

(d) By allowing multiple users to use individual time slot

This question was addressed to me in homework.

This question is from 2.5G in chapter Modern Wireless Communication Systems of Wireless/Mobile

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Correct answer is (b) By allowing single user to use consecutive user time slots

The best I can explain: HSCSD allows individual data users to use consecutive time slots in order to obtain higher speed data access on the GSM network. In case of GSM, it limits each user to use only one specific time slot.

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