Case Study: Service Quality Support in an IP-based Cellular RAN In this chapter, we shall study an IP-based Radio Access Network (RAN) as an example of applying the technologies of the preceding chapters. In the framework of preceding chapters, an IP RAN can be considered to be a multi-service Internet access domain supporting endpoint mobility. From the viewpoint of DiffServ, mobility is handled on the link layer. The traffic engineering framework of IETF is used to structure the example. In what follows, we shall first study the motivation for using IP-based transport in cellular radio access network. Next, IP RAN transport. | 9 Case Study Service Quality Support in an IP-based Cellular RAN In this chapter we shall study an IP-based Radio Access Network RAN as an example of applying the technologies of the preceding chapters. In the framework of preceding chapters an IP RAN can be considered to be a multi-service Internet access domain supporting endpoint mobility. From the viewpoint of Diff-Serv mobility is handled on the link layer. The traffic engineering framework of IETF is used to structure the example. In what follows we shall first study the motivation for using IP-based transport in cellular radio access network. Next IP RAN transport architecture is explained. After that an implementation of service quality support in IP-based RAN is accounted for using IETF s traffic engineering framework. The technologies listed here are generic to use of DiffServ-based transport in IP based RAN. DiffServ transport will be used in cellular backbones as well. Concentrating on IP-based RAN in this chapter has the advantage of providing a relatively well-defined case study of a multi-service access network. The same principles can be applied in the backbone network too but QoS management there is easier due to higher aggregation level of flows. Implementing Service Quality in IP Networks Vilho Raisanen 2003 John Wiley Sons Ltd ISBN 0-470-84793-X 276 SERVICE QUALITY SUPPORT IN AN IP-BASED CELLULAR RAN Further optimizations for service quality support in IP-based RANs are possible but are not discussed here. The goal of the present chapter is to provide a case study showing how traffic engineering and other advanced IP technologies reviewed in previous chapters can be put together to implement service quality in an IP-based RAN. MOTIVATION FOR USING IP-BASED TRANSPORT IN CELLULAR RAN The primary aim of QoS mechanisms in any cellular RAN transport is providing of quality support for services mapped to the four 3GPP traffic classes described in Chapter 5. Additionally the QoS mechanisms used .
