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GPRS : General Packet Radio System - page 20 / 20

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Networks: L17

20

Admission Control

to avoid system overload and to maintain quality of service

when a new user seeks to access the network, admission control estimates the network load

if the new load is sustainable, the new user is admitted

if not, the user is blocked out

Congestion Control

overload can still occur e.g. when a user moves to a new area

possible actions :

»

reduce the bit-rate of non real-time applications

»

if not sufficient, invoke an inter-frequency handover

»

hand some users over to GSM

»

discontinue the connection

Synchronisation of base stations

maintained by handsets measuring offsets in different cells and reporting back

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