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The performance of traditional TCP congestion control protocol degrades when congestion and contention increase in ad hoc networks that use the IEEE 802.11 DCF. Many of the problems result from medium contention at the media access control (MAC) layer. In this paper, we present a new contention-based congestion control (CBCC) method according to a novel congestion information from MAC layer. This...
As an essential part of Multi-channel MAC protocol, the channel scheduling algorithm aims at enhancing the network throughput and resource utilization. Based on the WAVE standard in vehicular communications, this paper improves WAVE MAC by using the time division access on service channels and proposes a channel scheduling scheme to negotiate and allocate the channel resources for throughput-sensitive...
This paper proposes a RSU assisted multi-channel coordination MAC (RAMC) protocol that fully utilizes all DSRC channels to provide simultaneous safety and non-safety communications. Within the radio range of a roadside unit (RSU), vehicles are free to tune to any service channels. The RSU monitors all the safety messages being transmitted in both the control and service channels. Periodically, the...
A novel cooperative routing protocol, namely throughput-optimized cooperative routing (TOCR) protocol, is proposed to improve network throughput in ad hoc network. Through calculation, we can deduced that by fixed transmission power, a cooperative node can raise received signal to noise ratio (SNR) at the receiving of recipient node, and then increase the probability of successful packets reception...
Interference in wireless sensor networks (WSNs) not only causes packet loss and delay, but also leads to excessive energy consumption. It is necessary to alleviate interference in order to improve transmission and energy efficiencies. To achieve this objective, an interference-aware cross-layer design, called interference-aware routing (IAR) protocol, is proposed. Unlike existing contention-based...
Interference in wireless ad hoc networks not only causes packet loss and delay, but also leads to excessive energy consumption. It is necessary to mitigate interference in order to improve transmission and energy efficiencies. To achieve this objective, a cross-layer routing (XLR) protocol for performance optimization is proposed. Unlike existing routing protocol, the XLR protocol employs introduced...
Based on the concept of random contention and collision resolution, a distributed QoS-guaranteed multiple access (QMA) protocol for mobile ad hoc networks is proposed to support multimedia service and multihop architecture. In the protocol, nodes with real-time traffic have higher priority to access channel than those with non-real-time traffic by broadcasting forecast bursts (FB) in earlier group...
A contention-based beaconless geographic routing (CBGR) protocol for mobile ad hoc networks is proposed, which includes a basic mode and an optional mode. In the basic mode, when receiving a data packet from upstream node, intermediate nodes in the forwarding area contend to relay it by waiting a dynamic forwarding delay (DFD), which is computed based on its relative position with the upstream node...
A novel multichannel multiple access (MRMA) protocol is presented for efficient channel sharing in mobile ad hoc networks. It flexibly employs request-to-send and clear-to- send (RTS/CTS) dialogue on a common channel and selects conflict-free traffic channel to accomplish the transmission of data packet based on a novel channel selection scheme. The acknowledgment (ACK) packet for the data packet...
A novel routing protocol, namely adaptive forwarding cluster routing (AFCR) protocol, is proposed to improve the network scalability in a large scale mobile ad hoc network (MANET). In the AFCR protocol, nodes are divided into several 1-hop clusters. Local routing information is exchanged between neighboring nodes to establish routes between cluster heads in adjacent clusters, which are further used...
Based on the concept of contention reservation for polling transmission and collision prevention strategy for collision resolution, a fair on-demand access (FODA) protocol for supporting node mobility and multihop architecture in mobile ad hoc networks is proposed. In the protocol, a distributed clustering architecture and an idea of reserving channel resources to get polling service are adopted,...
A novel multichannel MAC protocol, namely distributed channel reservation multiple access protocol, is presented for efficient channel sharing in multihop mobile ad hoc networks. It flexibly employs request-to-send and clear-to-send (RTS/CTS) dialogue on a common channel and selects conflict-free traffic channel to accomplish the transmission of data packet based on a novel channel selection scheme...
To improve the packet delivery ratio of destination- sequenced distance vector (DSDV) routing protocol in mobile ad hoc networks with high mobility, a novel message exchange scheme for its invalid route reconstruction is proposed in this paper. When route becomes invalid due to link breakage, the node that detects the link breakage tries to create a new loop-free route through message exchange with...
Based on the concept of random contention and collision resolution, a QoS-based multiple access (QMA) protocol for ad hoc networks is proposed to support multimedia service and multi-hop architecture. The traffic is divided into two groups with different requirements on delay, namely real-time traffic and data (or best effort) traffic. According to the protocol, nodes contend to access channel, and...
A novel routing protocol is proposed to improve the performance of destination-sequenced distance vector (DSDV) routing protocol in mobile ad hoc networks with high mobility. In the improved routing protocol, dissemination of invalid route information is restricted to local area. Meanwhile, a new route reconstruction scheme is used to create a new loop-free route to destination. Simulation results...
A QoS-based multiple access (QMA) protocol for multi-hop ad hoc networks is proposed. In this paper, the traffic is divided into real-time and non real-time traffic. According to the protocol, nodes with real-time traffic have higher priority to access channel than those with non real-time traffic by broadcasting forecast bursts (FB) in earlier contention slots. Meanwhile, traffic is scheduled according...
Based on the willingness factor, which considers relative mobility of nodes, a stable cluster protocol, which includes a stable clustering algorithm and a cluster maintenance scheme, is presented for mobile ad hoc networks. Simulation results show that compared with other cluster protocols, the proposed protocol effectively ensures the stability of the cluster architecture in highly-dynamic mobile...
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