What is MAHO | Mobile Assisted Handoff
This page explains MAHO i.e. Mobile Assisted Handoff.It mentions MAHO basics with respect to GSM system.
There are various types of Handoff viz. mobile initiated and base station initiated. We will understand Mobile initiated or mobile assisted handoff. Refer Handoff basics and types.
The figure depicts mobile assisted handoff. This is used in TDMA based frame structure typically used in GSM system. As shown mobile currently using TS0 and TS4 time slots for conversations with BTS-A.
In order to perform handoff mobile continuously performing RSSI measurements. RSSI stands for Received Signal Strength Indication. From the neighbour cell measurements, mobile decides on which cell or BTS to handoff. It does this based on higher signal strength among the one collected. Normally mobile uses either dedicated idle time slots in TDMA frame or any unused time slots for the RSSI measurements.
As shown Mobile is connected with BTS-A i.e. serving base station while BTS-B and BTS-C are the target BTSs. From BTS-B and BTS-C which ever has higher RSSI at mobile station, mobile will use that BTS for handoff.
Above procedure of handoff is referred as MAHO.