Optimised Iub flow control for UMTS HSDPA

In this paper, a strategy for exploiting the flow control signaling between the RNC and Node B for UMTS (Universal Mobile Telecommunications System) HSDPA (high speed downlink packet access) is presented. The flow control manages the transfer of data to the scheduler, that is located at the Node B. Simulation of a TDD mode cell demonstrates that the strategy achieves near minimum latency whilst at the same time limiting the data loss on inter-Node B handover. The loading of the flow control signaling on the Iub interface is acceptable.