QoS management with dynamic bearer selection schemes

This paper presents an evaluation of a radio level QoS management scheme de veloped to ensure the maintenance of QoS contracts. The concept of QoS cont ract is defined as the specification of the quality requirement for various types of services. According to the contracted QoS, a dynamic bearer selec tion is performed to adapt the link to the channel quality variations. Terr estrial Trunked Radio system (TETRA) presents itself as a suitable platform for illustrating the concept of QoS contract. This arises from its feature -rich bearer services that support data and voice with varying levels of er ror protection. The generic QoS management scheme presented in this paper h as been applied to a private mobile radio system but it also represents an appropriate platform for multi-vendor, multi-technology and multimedia envi ronments such as those found with 3G systems. (C) 2001 Elsevier Science B.V . All rights reserved.