Handoffs GSM uses mobile assisted hand-off (MAHO). Signal strength measurements are sent to the BS from the mobile. The MSC decides when to do a handoff.

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Presentation transcript:

Handoffs GSM uses mobile assisted hand-off (MAHO). Signal strength measurements are sent to the BS from the mobile. The MSC decides when to do a handoff and it informs the new BS and the mobile. When a mobile switches to a new BS it sends a series of shortened bursts to adjust its timing (giving the bS time to calculate it and send it) and allow the new BS to synchronize its receiver to the arrival time of the messages

4 types of handover 1 2 3 4 MS MS MS MS BTS BTS BTS BTS BSC BSC BSC MSC MSC

Handover decision receive level BTSold receive level BTSold HO_MARGIN MS MS BTSold BTSnew

Handover procedure HO access MS BTSold BSCold MSC BSCnew BTSnew measurement report measurement result HO decision HO required HO request resource allocation ch. activation ch. activation ack HO request ack HO command HO command HO command HO access Link establishment HO complete HO complete clear command clear command clear complete clear complete