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In a wireless domain where a mobile user accesses heterogeneous wireless technologies with multiple interfaces, a multi-path scheduling algorithm can benefit mobile users' experience by aggregating different network bandwidth together. However, existing literature actually shows that for TCP flows, it may not be the case. To better exploit multi-path scheduling for TCP connections, this paper presents...
In this paper, we extends bandwidth balancing technique in wired networks to operate in mobile ad hoc networks (MANETs). In bandwidth balancing in Distributed-Queue-Dual-Bus (DQDB), different nodes occupy the same channel, and information about the bandwidth is transferred between nodes in the unused bandwidth. Similarly, in wireless networks, the capacity on a channel is shared by several sources...
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...
This paper intends to propose a novel handover algorithm to balance the load of the layers in a multi-reuse scenario. Each layer works independently from each other and it has its own scheduling process, coverage and mobile stations attached. The algorithm proposed balances the resources among layers by moving mobile stations from one to another layer according their QoS requirements and channel condition...
In Ad Hoc network, transport protocol design is appearing to the research surface with quite innovative conceptions. TCP, a widely used protocol in the wired world, is not suitable for Ad Hoc Networks. To prevail over this problem researchers have provided many solutions that are either variants of TCP or independent of TCP. ATP is one of the protocols designed for ad hoc network independent of TCP...
The TCP throughput deteriorates in networks with large bandwidth-delay product, and new congestion control algorithms have been proposed to address such deterioration. Traditional TCP protocols treat all packet loss as a sign of congestion. Their inability to recognize non-congestion related packet loss has significant effects on the communication efficiency. The proposed protocols such as TCP - Reno,...
In this paper, we study about bandwidth and delay estimate in WMAN, and propose a method to obtain different delay estimate in multi-path by transmission detect packets. So that we can estimate any packet's transmission delay in each path. According to delay estimates of the different path, adjust the order of sending of data packet in Cache. So as to achieve the purpose of reducing delays of the...
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...
In message ferry delay tolerant network, certain dedicated mobile nodes (message ferries) facilitate data transfer between disconnected regions of network. Message ferries travel around partitions of network, collecting data from nodes and delivering it to others. Due to high mobility of nodes and network partitioning, such a data transfer can be highly unreliable and it becomes really challenging...
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...
In contention-based wireless networks, collisions between data packets can be reduced by introducing a random delay before each transmission. Backoff schemes are those that provide the backoff interval from which the random delay is drawn. In this paper, we propose a new scheme which calculates the backoff interval dynamically according to the network conditions. The network conditions are measured...
In mobile ad hoc networks, channel bandwidth is a very limited resource. When the network is heavily loaded, the rate of collisions and hence the number of retransmissions increase. This leads to a notable decrease in network throughput and hence reduces quality of service because more and more bandwidth is wasted. MAC layer enables sharing the channel among all the nodes in the network effectively...
The traditional TCP Reno, TCP Vegas and many other TCP variants used in wire network can not perform well in ad hoc environment. Because ad hoc network usually uses wireless channel and it has not the base station. And more, the ad hoc node can be mobile. The mechanism of detecting congestion by packet losses can not be valid. In ad hoc network, temporary link outages or fading-induced bit errors...
This paper introduces a novel mobility-aware routing protocol (MARP) for mobile, cognitive ad-hoc networks. Traditional routing protocols trigger the routing updates after the nodes detect the route failure. Even if the link condition is getting worse which means the link is likely to break in the future, the nodes will still transmit the packets along the current path. MARP uses cognitive techniques...
Ad hoc network is network in which there is no base station and any node can be connected to network temporarily. To support mobility, Node in ad hoc network generally communicates by wireless channel. In Ad hoc network, TCP Reno or TCP Vegas do not work well as they do in wire network, because they take packet losses or timeout as the signal of congestion. However, in ad hoc network, temporary link...
Based on the relations of the QoS parameters in wireless ad hoc networks, we proposed a new route found mechanism. The new mechanism calculate the length of the routing, the throughput require of the data transmit as bandwidth, and by the most of the bandwidth require to resource reservation to meet the QoS. Simulation result shows that it can meet the QoS require if the network allow.
This paper proposes a novel multi-channel MAC protocol for mobile ad hoc networks that enables the nodes to transmit packets in distributed channels. In our protocol, the ATIM window is divided into two windows. The first window is called deciding channel window (DCW). The source nodes and destination nodes can negotiate to decide a channel that can be used to compete the final data channel in the...
Using the application of bluck data transfer, we investigate the performance of QoS-satisfied pathover for transport layer mobility scheme such as mSCTP in FMIPv6 envirmonment. We find that existing scheme has some defects in aspect of pathover and throughput. Based on this, we make a potential change to mSCTP by adding QoS-Measurement-Chunk, which is used to take into account information about wireless...
This paper proposes the design of a scalable and reliable QoS architecture for mobile ad-hoc networks, which consists of i) a multi-path routing protocol, ii) a call admission control (CAC) scheme and iii) a congestion control mechanism. The multi-path routing protocol utilizes erasure code techniques for producing replicated fragments for each packet, to enhance reliability. Important fragments can...
In IEEE 802.16e mobile WiMAX system, since mobile stations (MSs) send bandwidth request (BR) messages to base station (BS) during contention period when they need uplink channel to transmit data in the case of multicast polling or broadcast polling, the uplink performance is affected by the size of the contention period in the uplink subframe. The access delay will be increased if the size of the...
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