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Energy consumption is a concern with mobile de-vices nowadays. Network interfaces are among the most power hungry components in these devices. In this paper, we describe the design and implementation of a client-centric protocol for energy efficiency. Inspired by earlier work, our protocol works by exploiting the TCP flow-control mechanism to shape incoming traffic into bursts in order to utilize...
Error control techniques in wireless links such as Automatic Repeat Request (ARQ) and Forward Error Correction (FEC) are still quite effective approaches in the improving system throughput in particular in time-varying channel environments. In this paper, a dual-branch selection diversity receiver of combining Selective Repeat-ARQ scheme and BCH channel coding (hybrid ARQ) in mobile cellular networks...
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...
Future wireless access will involve a variety of integrated and interworking technologies. Depending on the conditions (e.g., the specific application, the quality of service requirements, the user mobility) each session will be served through the most suited access network; following some event, there will be a variation of the access technology, which is called vertical handover. Although the use...
In this paper, we compare communication schemes in scenarios of interest for underwater networks where multiple nodes collaborate towards the accomplishment of a target detection and tracking task. We consider two specific cases: in Scenario 1, a mobile Autonomous Underwater Vehicle (AUV) i) collects data from a set of fixed sensors deployed on the seafloor or ii) transmits data to the same nodes...
Currently, Transmission Control Protocol (TCP) is the dominant protocol used in the Internet. It is the transport protocol that is responsible for the transmission of around 90% of the Internet traffic. TCP was originally designed for wired network where packet loss due to congestion dominates. Mobile Ad Hoc Network (MANET), one of the wireless networks, has special characteristics which cause several...
We consider the case of a Mobile Ad-Hoc Network (MANET), with nodes that have multiple packet reception (MPR) capability This is done by segmenting the incoming signal in a series of time-overlapping windows, each to be processed by an algorithm that separates each transmitter signal, as suggested in other works We will focus on the effect of varying the overlapping length. In this paper we addressed...
Next-generation wireless networks such as LTE and WiMax can achieve throughputs of several Mbps with TCP. These higher throughputs, however, can easily be destroyed by frequent handoffs, which occur in urban environments due to shadowing. A primary reason for the throughput drop during handoffs is the out of order arrival of packets at the receiver. As a result, in this paper, we model the precise...
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...
There has been a variety of rate adaptation solutions proposed for both indoor and mobile scenarios. However, dynamic channel changing conditions (e.g., temporal channel variation due to unpredictable traffic pattern) make it virtually impossible to guarantee the same evaluation environment for all these schemes. Moreover, developing these schemes exhaustively on actual hardware can be gruesomely...
Considering that nodes move in wireless ad hoc networks, network topology and node locations change. A single transmission power can not meet mobile ad hoc networks. This paper proposes transmission power optimization algorithm based on various nearest-neighbor distances algorithm. Transmission node is informed of neighbor node locations in its maximum transmission range through network location management...
Mobile devices with ever increasing functionality are an important driving force behind innovative mobile applications that enrich our daily life. The ubiquitous availability of wireless data communication networks is an additional driving force. Their ability to support application data flows is one of the performance criteria for successful mobile application deployment. Nevertheless, the quantitative...
Accurately selecting modulation rates for time-varying channel conditions is critical for avoiding performance degradations due to rate overselection when channel conditions degrade or underselection when channel conditions improve. In this paper, we design a custom cross-layer framework that enables: 1) implementation of multiple and previously unimplemented rate adaptation mechanisms; 2) experimental...
Mobility management solutions designed for heterogeneous networks can provide seamless handover and service continuity. Thus, ongoing TCP sessions can remain active, even when mobile node handovers from one access network to another. In such seamless handover, packet loss can be avoided but TCP still undergoes through several performances degradation issues due to change of network characteristics...
A multi-user MIMO/OFDMA system for the next generation broadband wireless access (BWA) networks is studied, in which the base station (BS) has only knowledge of the statistics of the channel. A combination of MIMO, OFDMA and FDD could be suitable to increase spectral efficiency in a high speed network. We investigate methods with scalable channel feedback and we analyze the trade off between the amount...
Flow control scheme for VANET has not been sufficiently studied. In this paper, we consider the unique characteristics in VANET and propose our flow control scheme called flow control with packet living time prediction (FC-PLT). FC-PLT is based on OPET and mainly solves the interflow contention problem by assigning higher priorities to the packets with less packet living time (PLT) defined as the...
Inter-vehicle communications (IVC) based on mobile ad hoc networks have attracted increasing attention of researchers recently. In this paper, we study the communication performance of IVC networks in multilane dynamic traffic streams. We are concerned with the influence of several traffic factors on multilane communications, such as vehicles' high mobility, traffic directions or relative speed, and...
We propose a new cross-layer mechanism, referred to as route-control, for mobile ad-hoc networks (MANETs). This mechanism, which works in the network and transport layers, aims at enhancing the performance of MANETs' reliable transport protocols. The main idea behind the proposed mechanism is to notify the sender when the packets of a Transport layer flow change their route. We show that the sender...
As more and more devices are equipped with multiple network interfaces, the multihomed technology is becoming an important technology that can provide more reliable connections against the network failure and better data transmission rate. Concurrent Multipath Transfer (CMT), which is based on SCTP, is devised for multihomed networks. CMT can transmit data over all paths to maximum the data transmission...
This paper proposes a link quality aware routing protocol for MANETs resulting in robust delivery and high performance by finding out a reliable path with strong links. During route discovery, the strong links are effectively exploited by forwarding the route request (RREQ) packet with the highest link quality or signal to interference plus noise ratio (SINR) among the multiple RREQ packets received...
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