Handover Mechanisms in ATM-Based Mobile System

摘要

The main theme of this paper is the presentation of two handover mechanisms thatcan be used in the ATM access network. The first handover mechanism is relatively easy and assumes that there is sufficient time available such that all data and history information of the old path can be transferred to the Mobile Terminal (MT) before the actual handover to the new path takes place. This first mechanism is called 'handover synchronized switching'. It is possible that the time between a handover decision and the actual handover is too short to end the transmission on the old path gracefully (e.g., ending the interleaving matrix, ending transcoder functions, emptying intermediate buffers). A possible solution for this problem is given by the second handover mechanism where multicast connections are used in the core network. This mechanism is called 'handover with multicast support'.