Guaranteed end-to-end QoS for VoIP over cellular links based on IPv6 compression

Internet and cellular technologies are merging to decrease transport costs and enable IP-based applications. Real-time voice services will continue to be dominant in future cellular systems and to reduce system costs it is desirable to base all services, including voice on IP. Voice services in cellular systems should be able to use damaged speech data. This can be done by using the proposed FAHCP (full adaptive header compression protocol) which provides checksumming flexibility that delivers the partially damaged speech data to the application. Protocol overhead for IP-based voice services can be reduced by compressing headers, e.g. with the compressed real-time protocol (CRTP) but it is not robust in the face of errors of the cellular link. FAHCP is suitable for cellular systems, delivers more packets to the user with a suitable compression ratio. The scheme presented in this paper overcomes the faults associated with previous header compression techniques based on the confidelity between compressor and decompressor which is validated by our experimental measurement.