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As wireless local area networks (WLAN) become ubiquitous and an integral part of data networks, they will also be increasingly used for applications ranging from standard Internet services like ftp to time bound multimedia applications, such as Voice (or Video) over IP (VoIP/VIP), HDTV etc. with strict latency, throughput or jitter restrictions. These applications on WLAN will also be more bandwidth...
Network management is one of the important areas in todaypsilas computing world. A basic requirement for the management of a complex network is the definition of high-level and flexible models to coordinate the accesses to the resources data and services provided by the network nodes. Most of the network management platforms are based on polling-based centralized SNMP management model which has the...
In a multihop wireless network, the throughput performance decreases seriously because of inter-flow and intra-flow collision. The backoff algorithm is the de facto function to resolve collision in 802.11 networks. In this paper we study the impact of five back-off algorithms on the performance of 802.11-based multihop wireless networks with different network topology and flow patterns. Simulations...
Improving TCP performance has long been the focus of many research efforts in 802.11 wireless networks study. Hop-count and round trip time (RTT) are the critical sources which serious affect the TCP performance on end-to-end connection. In this paper, we analytical derived the affection and based on the analysis we propose TCP should change its expected value (TCP-CEV) when hop-count and RTT change...
The network-centric future force must support a large and diverse group of communication nodes. While much network design in networks such as future combat systems (FCS) and warfighter information network- tactical (WIN-T) can be done using existing TCP/IP protocols, there are important performance limits when the network conditions become more extreme (e.g., highly mobile or dense). A solution for...
The design and development of future ground-space integrated networks is one of the hot issues in space technology nowadays because of the long-link delay, high bit-error-rate, asymmetric bandwidth, intermittent links compare with the terrestrial networks. The focus of this paper is to design topology for this hybrid networks with space segments, select appropriate protocols for it and analyze its...
In wireless ad hoc networks, the over-fast growth rate of TCP congestion window is one of the main factors that lead to frequent link contention and routing failure. Based on recent research, this paper proposes a cross-layer design protocol that adaptively adjusts routing failure verifying policy and TCP congestion window growth rate based on link contention state sensing. Simulation results show...
In this paper, we address the placement of relay service agents (routelets) in the Internet to assist multipath transport protocols; these protocols are designed to achieve better network utilization and fairness by exploiting path diversity in the Internet. We identify three different routelet deployment scenarios, provide LP formulations for routelet placement in each of the scenarios, and prove...
The problem of designing high capacity and high bit rate IP-over-WDM networks, which can provide uninterrupted service in the presence of network equipment failures, continues to attract significant interest from the research community. An IP-over-WDM network implements Internet Protocol (IP) directly over physical WDM network by establishing lightpaths using IP routers, optical crossconnects (OXC)...
The poor performance of TCP over multi-hop wireless networks is well known. In this paper we explore to what extent network coding can help to improve the throughput performance of TCP controlled bulk transfers over a chain topology multi-hop wireless network. The nodes use a CSMA/CA mechanism, such as IEEE 802.11psilas DCF, to perform distributed packet scheduling. The reverse flowing TCP ACKs are...
Ad hoc networks are wireless networks of mobile nodes, self-organizing systems formed by co-operating nodes within communication range of each other that form temporary networks in which the topology rapidly changes result from the movement of mobile nodes. This frequent topology may lead to sudden packet losses and delays. So, the current implementation of TCP for the Internet is not efficient when...
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