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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...
For MAC (Media Access Control) protocol not providing QoS(Quality of Service) guarantees. With the increase of multimedia sevices in wireless networks(for example:voice, video, etc), when the networks get crowded, real-time applications will decrease its performance. We proposed a wireless network algorithm for 802.11e, witch supports fixed nodes and mobile nodes, and also swiches and new connections...
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...
In a wireless network, multiuser diversity can be exploited by allowing the mobile user with the best channel to use the channel. However, the overhead incurred in polling channel state information (CSI) can overshadow the multiuser diversity gain. In our previous work, we proposed a Multiuser Diversity with Capture (MDC) scheme to reduce the overhead by taking advantage of the fact that only the...
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...
A cross-layer scheduling algorithm that streams pre-coded H.264 video over wireless networks to multiple users is presented. The algorithm can be used with the emerging wireless standards such as IEEE 802.16 and HSDPA. Our focus is maximizing the video perceptual quality after delivery with constraint of the limited wireless resources and the delay requirements from the practical point of view. At...
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...
A retransmission cut-off algorithm for Slotted ALOHA random access protocol is studied in terms of the new packet generation rate, the number of retransmission trials and the Multi-packet Reception capacity. The retransmission cut-off is not needed for a stable operation of Slotted ALOHA if the new packet generation rate is below a critical limit. The values of these critical limits increase almost...
In this paper we study a dynamic multiple access in distributed wireless networks with random number of users. We apply evolutionary game theoretic analysis to solve several problems: (a) We address the stability of Aloha-like systems with finitely many power levels. Specifically, we consider very large number of receivers distributed in several locations. Each of them receives packets from random...
In recent years, IEEE 802.11 wireless networks become one of the most important components in wireless networks, since compared with other wireless technologies, IEEE 802.11 devices are inexpensive and easier to be configured. To provide seamless roaming in the IEEE 802.11 wireless networks, MAC layer handoff latency should be minimized to support real-time applications. This paper proposes a novel...
Infrastructure meshed networks provide access to wireless clients that do not participate in traffic forwarding. This paper proposes minimalist instant handoff for wireless access networks (MIHAN), allowing for seamless movement of nodes in coverage areas, while maintaining connectivity. The approach of MIHAN is that all client frames, send in radio range of an access node, are received and forwarded...
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...
A new network transmission framework highlighting the concept of cross-layer co-design for packet loss reduction is presented in this article. The proposed framework takes into account the correlation between the packet loss rate and the packet size under a given channel condition, and assigns different tasks to layers involved: physical/ MAC layer for monitoring current channel statuses, IP layer...
TCP was designed to perform on wired networks, where packet loss is mostly caused by congestion, as compared to wireless networks, where losses due to error in channel are more likely. Hence TCP respond to all kind of losses by invoking congestion control and avoidance schemes resulting in performance degradation. Several solutions for the improvement of TCP over wireless link have been proposed which...
In this paper we present a solution for providing a fast handover in wireless networks which involve network access control based on the ExtensibleAuthenticationProtocol. We propose an approach based on cryptographically generated identities, which reduces the number of round trips during authentication phase and achieves the objective of reducing the impact on existing EAP deployments.
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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