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In order to avoid routing overhead and reduce management fee for transmisson of routing information, we purposed two heuristic algorithms which are self-pruning algorithm and dominant pruning algorithm. This algorithm is more efficient than the aimless flooding in wireless networks, and redused unnecessary transmission of information and nodes switching by the movement between neighbourhoods. Result...
Multichannel wireless networks provide the flexibility to utilize the available spectrum efficiently for achieving improved system performance in terms of throughput and spectral efficiency. However, there has been no practical means for provisioning quality of service (QoS) in multichannel wireless networks. While previous proposals providing signaling and adaptation mechanisms for QoS, they support...
In this paper, we jointly address the scheduling problem such as rate control, medium access control (MAC) and routing for cooperative vehicular ad-hoc networks (VANETs) in the framework of cross-layer design. Compared to its counterpart in a wired network where link capacities are assumed to be fixed, congestion control in a multi-hop cooperative VANETs is much more complex and requires joint optimization...
This paper extends the existing static framework for joint flow control, routing and medium access control (MAC) in random access multi-hop wireless networks in to a dynamic framework where link capacities vary over time. The overall problem is formulated as a long term network utility maximization (NUM) problem (instead of the existing static NUM problem) that accounts for link capacity variation...
The wireless sensor network is a new kind of wireless ad hoc network and highly applications prospects. The efficient routing protocol is the focus of researching. Now we request the sensor network more and more strictly demand with the deepening research and application. However, the congestion will make decrease performance of network quickly with the increase of data load in wireless sensor network...
Transmission control protocol (TCP) assumes a relatively underlying network where more packet loss is due to congestion. In a wireless network packet losses will occur more often due to unreliable wireless links. When TCP is used over-wireless networks, each packet loss on the wireless link results in congestion. Congestion control mechanisms have to be applied, after finding out the reasons for packet...
Recent technological advances have enabled SDRs to switch from one frequency band to another at minimum cost, thereby making dynamic multi-band access and sharing possible. On the other hand, recent advances in signal processing combined with those in antenna technology provide MIMO capabilities, thereby creating opportunities for enhancing the throughput of wireless networks. Both SDRs and MIMO together...
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...
In this paper, we consider the mobility effect with a jointly optimal design of cross-layer congestion control, routing and scheduling for ad-hoc networks. We first formulate the rate constraint and scheduling constraint. In this way, we use multi-commodity flow variables. Then formulate resource allocation in networks with fixed wireless channel and single-rate devices. Because of entrance of the...
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