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GPRS : General Packet Radio System - page 9 / 20

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9 / 20

Networks: L17

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theoretical 172kbs available but normal allocation includes :

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1 slot needed for a control packet

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at least 2 slots reserved for voice traffic

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remaining slots possibly for data packets

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29 combinations of downlink and uplink slots defined

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maximum data rate one user can usually expect : type 4+1

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4 slots downlink = 413.4kbs = 53.6kbs, 1 slot uplink = 13.4kbs

mobiles classified as to their ability to support simultaneous voice and data

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class A : simultaneous voice and data

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class B : automatic switching between voice and data

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only one active at a time

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user can put data on hold while they receive phone calls and vice versa

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class C : hand-operated switching between voice and data

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voice calls must be cleared before GPRS can be used

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classes B and C developed first for faster time-to-market, class A later

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