The IEEE 802.11 MAC protocol cannot support quality of service (QoS) requirements. In order to provide QoS in the IEEE 802.11 MAC protocol, the IEEE 802.11e has been standardized. These standards provide multiple transmission rates, which can be changed dynamically according to the channel condition. When using multiple transmission rates, the capacity of wireless LAN improves, but the performa...

We present a strategy for Slepian-Wolf coding when the joint distribution of the sources is unknown. The encoders use an incremental transmission policy, and the decoder a universal sequential decision test. We show that the decoder is able to decode shortly after the rates of transmission exceed the Slepian-Wolf bounds. The decoder then send an ACK back to the encoders, terminating transmissio...

Current congestion control mechanisms in today’s Internet rely on end-to-end TCP congestion avoidance algorithms that back off sources when congestion occurs, detected by packet loss or explicit congestion notification signals. But one of the major setbacks of such mechanisms is making sure that all sources respond correctly in applying congestion avoidance measures during periods of high conge...

Multicast is a very popular bandwidth-conserving technology exploited in many multimedia applications. However, existing standards of high rate wireless networks provide no error recovery mechanism (ARQ) for multicast traffic. ARQ absence in wireless networks unreliable by their nature leads to frequent packet losses, which is inappropriate for most of multimedia applications. In this paper, we...

We present a transmission rate adaptation algorithm called AGILE (ACK-Guided Immediate Link rate Estimation) for IEEE 802.11 networks. The key idea of AGILE is that the transmitter adjusts the transmission rate by means of measuring the SNR (Signal-to-Noise Ratio) during any frame reception including the ACK (Acknowledgment) frame, and estimating the corresponding maximum achievable throughput ...

New broadband access technologies such as Hybrid Fiber Coaxial (HFC) are likely to provide fast and cost e ective support to a variety of applications including Video on Demand (VoD), inter-active computer games, and internet-type applications such as Web browsing, ftp, email, and telephony. Since most of these applications, use TCP as the transport layer protocol, the key to their eÆciency lar...

TCP over wireless networks is challenging due to high random losses and data-ACK interference. To address both problems, a new hybrid network coding scheme, ComboCoding, is proposed. ComboCoding combines intra-flow and inter-flow coding to provide robust communications over TCP in disruptive wireless networks. Intra-flow coding mitigates losses by using a modified random linear coding scheme th...