A dynamic resource allocation for the FRAMES Mode 1 Project

A distributed dynamic resource allocation strategy (DRA) for hierarchical cellular systems (HCS) is proposed. A mixed environment is suggested for the evaluation of the DDRA, which consists in a multilayered scenario composed of a microcell and a macrocell layer. In the DDRA, resources are shared not only between cells of the same hierarchy but between layers. An initial spectrum partitioning is performed and dynamic management of the spectrum between layers is done by the DDRA. A resource is defined as a fraction of a time slot or a CDMA code. According to the FRAMES Mode 1 Project description, the proposed DDRA fulfils the role of a slow and of a fast DRA, as requested. Users are classified according to their speed as slow moving users and fast moving users and they are attended by the most suitable layer, according to their speeds. Five types of real time circuit switched services are considered in the evaluation: speech and data at four different speeds. Data rates taken into account are 32, 64, 144 and 384 kbps. The DDRA is compared to fixed resource allocation (FRA) with hand-up without hand-down facilities and to FRA with hand-up and hand-down with and without channel reallocations (FRAHR). The proposed DDRA strategy is evaluated using the hybrid CDMA/TDMA proposal made in the FRAMES Project Mode 1