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This paper investigates the latency of packet transmission during mobility with and without the support of a handover mechanism. The Receiver-Initiated MAC protocol (RI-MAC) is used for the analysis. When the handover mechanism is applied, it enables a node to establish a new connection before the existing link breaks. A mathematical model is set up to examine the performance of RI-MAC when it uses the handover mechanism and when it does not. The analytical result shows that the handover latency is much less than the latency introduced when a node waits until an existing link breaks and then establishes a new link.