An analytical formulation of the outage probability in terms of bit error rate specification for variable bit rate (VBR) multiclass services in the uplink of a multirate DS-CDMA-based cellular system is presented. The analytical framework is formulated for the general case in which different traffic classes have different spreading gains and within a class the users can have different spreading...

Video transmission over wireless links is an emerging application which involves a time-varying channel. In this paper we propose that rate control algorithms should be used at the video encoders, along with models of the channel behavior , to improve the performance of such systems. Rather than letting information be lost as the channel conditions change, in our scheme channel state informatio...

Streaming videos over wireless networks suffers from low video quality due to network ability limitations. The quality of the channel and the characteristics of source play the major role in transmitting video stream over mobile environments. On failure of wireless video transmission, retransmission method was employed to improve the reliability of wireless link. However, retransmission of vide...

We consider an integrated-services communication network handling, in particular, best-effort data traffic and rate-regulated, delaysensitive variable bit-rate (VBR) traffic. From the user’s perspective, the pricing mechanism of the network may provide an incentive for the user to transmit best-effort packets in the real-time VBR channel, i.e., transmit best-effort packets “in-band” using some ...

Packet reservation protocols are well suited for medium access control in star-configured networks. In this paper, we propose a centralized adaptive reservation (CAR) protocol for integrating constant bit rate (CBR) traffic, variable bit rate (VBR) traffic and unspecified bit rate (UBR) traffic over a star-configured network. Simulation results are presented to illustrate the performance of the...

This paper discusses the application of measurement-based admission control methods for efficient resource utilization in the premium variable bit rate service of the AQUILA QoS IP network. The design of the architecture for measuring aggregate mean bit rate to support admission control is presented together with the results of testbed experiments with the prototype implementation. Additionally...

A variable bit rate multiband excited linear predictive speech coder is proposed in this paper. Speech signal is compressed in different bit rates ranging from 0.88 kbps to 2.6 kbps according to the mode of operation and the optimum V/UV transition frequency. An average bit rate of 1.24 kbps is achieved. The proposed speech coder improves the speech quality by splitting the non-stationary speec...