Both delay and bandwidth are the crucial node state information considered in QoS routing schemes for multimedia applications in mobile Ad Hoc networks In this paper, we propose an application-aware QoS routing scheme for multimedia applications in mobile Ad Hoc networks In our scheme, the real time control protocol (RTCP) is used to estimate the node state instead of the additional probing messages, and an optimally stable route can be established according to QoS requirements of the multimedia application based on the node state information It has been shown that the routing performance is improved significantly compared to the existing schemes using the additional probing messages

An application-aware qos routing scheme with improved stability for multimedia applications in mobile ad hoc networks

A flexible scalable encoder (30) includes a scalability mode controller (50) controlling various encoder stages (42, 44, 46, 48) to produce coding layers with different functionality depending on the measured network/ channel conditions. This encoder is able to both maximize functionality of the bitstream as well as coding efficiency, thus delivering both a robust as well as efficient bitstream.

Adaptive source signal encoding

In this paper, we present a novel reliable MPEG-4 based packetisation scheme over UMTS (universal mobile telecommunications service) networks. Using this scheme, some lost crucial RTP packets can be delivered within a multiplex RTP packet. With the feedback of RTCP control packets, this paper presents a decision-making procedure by which we can calculate the number of the redundant packets in a multiplex packet during a RTCP interval, i.e., this procedure can precisely reflect current network congestion state dynamically. To support the proposed procedure, two conditions must be satisfied. The first one is the RTP packets loss constraint and the second one is the RTP packets delay limitation. Moreover, through investigating related RTP payload formats and FGS (fine granularity scalability) framework, we can deliver BL (MPEG-4 basic layer) data by the proposed scheme. EL (MPEG-4 enhancement layer) data will be delivered as the best-effort traffic. Finally, simulations over UMTS networks demonstrate the validity of this scheme. Further comparison between this scheme and the traditional schemes also is done. The results show that our scheme improves QoS of services significantly.

A novel reliable MPEG4-based packetisation scheme over UMTS networks

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A novel reliable MPEG4-based packetisation scheme over UMTS networks