With the increased demand for high data rate wireless communication and the emergence of various wireless technologies, several integrated heterogeneous wireless systems, such as Multihop Cellular Network (MCN) and integrated Cellular and Ad hoc Relaying (iCAR) system, have been proposed recently. In this paper, we address the location management issue which is critical for the performance of heterogenous networks. We define a new performance metric called
Quality of Coverage (QoC)
. Using the iCAR system as an example, we compare various placement strategies in terms of their QoC values, and provide three rules of thumb as the guidelines for the placement of the ad hoc relay stations in iCAR. This QoC concept can be adopted in general, in deciding the optimum node locations (which need not be specialized ad hoc relay stations) for relaying traffic.