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In next generation mobile heterogeneous networks, WiFi-based wireless networks are becoming important components, because WiFi devices are widely used in laptops, PDAs and other mobile computing machines. In a WiFi-based wireless network, handoff management is a key service, as the radio range of the WiFi device is limited. Moreover, providing seamless roaming in wireless networks is mandatory for...
Communication between two neighboring nodes is the most basic operation in wireless networks. Yet very little research has focused on the local delay, defined as the mean time it takes a node to connect to its nearest neighbor. In this paper, we derive the local delay in Poisson networks with ALOHA and find the conditions for which the local delay is finite. It turns out that while the local delay...
Most traditional MAC protocols proposed for wireless networks assume static Network Units (shorted as NUs), which usually lead to performance degradation in mobile scenarios. In this paper, a novel hybrid MAC protocol, called MA-MAC, was presented for multi-hop mobile Tactical Data Link networks based upon the mobile characteristics of NUs. The basic point of MA-MAC is that the transmit mode of each...
TCP now is widely used in Transmission Control Protocol; however, in the wireless network environment, TCP congestion control typically has some defects such as high-error rate, long-latency, low-bandwidth and frequent-movement, etc. In the wireless network, the implementation difficulty of congestion control mechanism is the degree of congestion, which is not only relevant to the length of the queue,...
Recently, IEEE 802.11-based wireless networks have been widely adopted as the main access technology. This type of wireless network is know for its low cost, easy deployment and easy configuration. However, the radio range of access points in an IEEE 802.11-based wireless network is limited, thereby mobile nodes have to switch their access points frequently in order to maintain connections in a mobile...
We propose and analyse a new random access protocol with multiple power levels selection schemes for infrastructureless wireless networks. In these networks, mobile nodes may communicate with each other without a central entity (base station), where each mobile node will be either in a transmitting mode or in a receiving mode or in an idle mode. Throughput with random power levels selection scheme...
This paper presents a medium access protocol for spread spectrum networks. We have focus on the use of the protocol in MANETs to increase the throughput of the network. We focus on the use of the protocol in mobile ad-hoc networks (MANETs) to increase the throughput of the network. The existing IEEE 802.11 MAC protocol uses spread spectrum technique at the physical layer. However, it uses the same...
Multicasting has not been widely adopted until now, due to lack of receiver or end user (EU) access control. We have developed the Internet group management protocol with access control (IGMP-AC), an extended version of IGMPv3, which provides EU access control by incorporating the AAA framework into the existing multicast service model. Furthermore, IGMP-AC works as an extensible authentication protocol...
In this demo, we showcase DiffQ - a congestion control protocol inspired by theoretical cross-layer optimization approaches. DiffQ can support congestion control for network flows that use either single-path or opportunistic multi-path routing. Our demo will focus on the performance in single-path routing environments, where contemporary end-point congestion control algorithms like TCP face severe...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
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