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In IEEE 802.16 networks, bandwidth allocation is centralized at the base station (BS). For the uplink traffic, data transmission is scheduled after the BS processes bandwidth requests (BW-REQs) sent by mobile stations (MSs). In this paper we focus on the multicast/broadcast polling method, where MSs send their BW-REQs during contention periods. Contention-based polling is deemed suitable for Best-Effort...
IEEE 802.16j is an extension of IEEE 802.16 to support relay mode operation. This paper applies IEEE 802.16j to vehicular networks to provide Internet access for high-way vehicles. It designs a utility function, which considers different types of services and effect of velocity on vehicular networks. It proposes a dynamic bandwidth allocation (DBA) algorithm specifically for base stations (BSs) in...
This paper proposes a method for measuring the available bandwidth, based on testing network packets of various sizes (variable packet size method, VPS). The range of applicability of the model has been found, it is based on the accuracy of the measurements of packet delays. We have also derived a formula for the upper limit of the bandwidth. Computer simulations have been performed and the relationship...
We discuss the dynamic bandwidth allocation schemes in TDMA uplink channel of satellite networks. And a scheme based on max-min fairness is discussed and implemented in Tdma-bod simulator of ns-2. Simulation results show that this scheme can improve the throughput and delay performance and provide better QoS for satellite system. And in future network scenario that including more burst traffic and...
The congestion control scheme plays a critical role in the multicast communication. Without a proper congestion control mechanism, multicast protocols would cause unfairness while sharing network bandwidth with other flows. We propose a deliberated congestion control scheme to multicast multimedia contents for smart phones retrieving effectively. Our key idea is to detect the single trip time of packet...
Vehicles in Intelligent Transportation System employ IEEE 802.11p/1609 protocols to communicate with other vehicles or roadside infrastructure within a specific area. Messages related with traffic safety can be delivered timely for collision avoidance and etc. Meanwhile, non-safety related infotainment messages can also be transmitted besides safety-critical information. Many of the safety critical...
This paper proposes a new ring structure of network coding (RSNC) based on existing network coding topology, enlarging the field of application and reducing the complexity of coding. On the basis of real-time monitoring and dynamic allocation for network bandwidth, RSNC is applied to the CERNET backbone network. The route of the packet is decided by the source node when it sends data packet and it...
Heterogeneous Wireless Networks are considered nowadays as one of the potential areas in research and development. The traffic management schemes that have been used at the fusion points between the different wireless networks are classical and conventional. This paper is focused on developing a novel scheme to overcome the problem of traffic congestion in the fusion point router interconnected the...
In this paper, we focus on the serious problem that many WDM architectures for ring metropolitan area networks introduce: the limited fiber bandwidth utilization and the low values of maximum throughput achieved. We propose an efficient scalable multi-buffer architecture in conjunction with a slotted WDMA protocol that totally avoids both the WDM channels and the receiver collisions providing significant...
Dynamic bandwidth allocation (DBA) is an open and hot topic in the Ethernet passive optical network (EPON). In this paper, we propose an efficient DBA scheme for EPONs. Unlike traditional DBA schemes, the proposed DBA scheme adapts the polling cycle time not only to the uplink traffic load but also to the downlink load. Thus it can adapt polling duration to the downstream load, and keep the high throughput...
Various studies have shown that regular TCP is inefficient in high-speed networks. This paper proposes F-TCP, a delay-based TCP variant, which is able to operate efficiently in high-speed networks. The slowstart phase of F-TCP continues until a threshold determined from probing the available bandwidth. When competing with loss-based flows F-TCP reduces it's window to a value derived from the available...
Mainstream applications-such as file copy/transfer, Web, DBMS, or video streaming-typically issue synchronous disk requests. As shown in this paper, this fact may cause work-conserving schedulers to fail both to enforce guarantees and provide a high disk throughput. A high throughput can be, however, recovered by just idling the disk for a short time interval after the completion of each request....
The efficiency of computer network has been regarded as a bottleneck in parallel computing paradigm. It is important to have efficient methodology to obtain network performance measures, especially for a large scale system, i.e. exa-scale system. Communication performance is often investigated by the static complexity analysis based on a given network topology or a detailed network simulation, which...
In WiMAX Mesh Networks, the waste problem of allocated minislots in the three-way handshaking procedure of Coordinated Distributed Scheduling (CDS) will degrade the end-to-end performance of traffic flows. In this paper, an enhanced mechanism which combines adaptive holdoff algorithm with regrant solution is proposed to deal with the above-mentioned problem. Moreover, a new grant horizon based on...
Distributed Coordination Function (DCF) in IEEE 802.11 WLANs cannot guarantee both per-station and per-flow fairness among wireless stations. Several solutions to this problem have been proposed. However, per-flow fairness causes per-station unfairness and vice versa due to the fact that each wireless station may transmit different number of flows. In this paper, a novel method has been proposed to...
Existing congestion control protocols have significant limitations in achieving high throughput and reasonable fairness while maintaining fast convergence speed in high bandwidth-delay product networks. In this paper, we propose the general congestion control protocol (GCCP) to address this limitation. GCCP allows for aggressive behavior in large underutilized links to achieve high throughput, but...
For the limited network resource, the performance of Mobile Ad Hoc Network is influenced seriously by the overloaded data flows, a novel distributed end-to-end admission control mechanism based on bandwidth estimation is proposed in this paper. Considering channel utilization, frames collision and backoff procedures in network, the available bandwidth is estimated, and then the decision of whether...
IEEE 802.16 network has quickly been deployed in worldwide in recent years. However the signal transmitted by the Base Station is susceptible to shadows of buildings, therefore resulting in a poor signal quality received by Mobile Station. For this reason, IEEE 802.16j intends to improve the above mentioned network problems incurred from IEEE 802.16 through relay station. This allow IEEE 802.16j network...
In shared-medium wireless networks, nodes contend for medium access in space, time and channel bandwidth. Uncontrolled competition for limited network resources causes severe packet collisions and compounds network congestion. Consequently, data transmission is subject to very long delay, significant packet loss and poor throughput. This work focuses on improving data transmission in wireless ad hoc...
Presently, It is paid much attention to network performance, as a main criterion, delay is becoming more and more important. A network model for a certain network is built by simulation software. It analyses the relations among delay, throughput, user number and bandwidth. Then it points out the direction to decrease the network delay by simulation and it can optimize the network performance with...
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