Dynamic bearer selections schemes in an adaptive TETRA resource manager and their influence on QoS

This paper investigates the use of link adaptation techniques for the TETRA air interface. For this purpose, a radio resource management scheme is presented along with the notion of quality of service (QoS) contract. A QoS contract is the means for specifying the expected network performance and optionally enables the user application/service to specify a degree of degradation tolerance over the wireless link. The paper presents simulation results showing the effect of various parameters on what can be delivered by the TETRA system. Furthermore, a service adaptation scheme for multimedia applications is presented for complementing link adaptation.