Low-Complexity Call-Management Scheme for Cellular Networks

In wireless mobile environments, where resources are scarce, the basis for quality-of-service (QoS) provisioning is the admission control (AC) of new and handoff subscriber services to avoid future detrimental perturbations of established connections. Most research efforts considered only the bandwidth of the wireless link to control the admission of new services. In addition, proposals for degrading and enhancing services only account for mobility. In this paper, we propose a novel approach for service admission and adaptation that considers, in addition to the station mobility, both bandwidth and error-rate requirements as well as the possibility of multiple services per mobile station, while minimizing interference to neighbor cells as well as signaling overhead. When compared with other proposals in a simulated third-generation (3G) cellular system, our AC approach outperformed by more than 10% the equal priority and guard capacity policies in terms of the total number of accepted services in the cell, particularly at high handoff and new-call rates. Moreover, our adaptation scheme succeeded in improving the admission probability by a further 13% in indoor and outdoor environments.