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Finding the available network capacity for a TCP connection is an important research problem as it allows the connection to improve its throughput and fairness in addition to reducing packet losses. As flows arrive and depart randomly in the network, the state of a TCP connection at any instant is very dynamic and a good estimate of the available capacity can enable TCP to quickly adapt to the actual...
Hybrid network of wired and wireless technology has become hot topic research as a result of increasing demands in applying wireless network for industrial application. Hybrid network introduces different delay characteristic, depending on what technology that compose the hybrid network. In this paper, we present a framework for building a hybrid network composed of CAN protocol and ISA100.11a industrial...
In this paper, we investigate the video stream distributed transmission problem for the emergency communication over heterogeneous wireless networks. The key issue of the transmission problem is how to guarantee the quality of service, when the video stream is transmitted by multiple wireless access networks. According to observed available bit rate (ABR) and round trip time (RTT) over each access...
Currently, there are several wireless access networks available to support mobile users. Furthermore, new services have also emerged and aim to allow such mobile users to access the services from anywhere at any time without interruption while moving across heterogeneous wireless access networks. The new services require internetworking and integrated solutions between existing heterogeneous wireless...
An improved scheme mARQ of link layer selective retransfer is proposed to elevate the TCP performancein the wireless circumstance. This schema sets a limitation to the sum of retransfer times on the basis of the char-acteristic, that is, each data packet can be divided into several wireless frames ,so that the retransfer time of a fra-me can be allocated adaptively according to the requirement. The...
The configuration of WLAN MAC by means of Super Frame (SF) and Contention Free Period (CFP) variation is one of the effective schemes to provide QoS to interactive multimedia (IMM) traffic. In this paper we investigate the usefulness of an auto-generated dynamic parameter set of CFP and SF combinations as the logical look-up table for the WLAN medium access control scheme. A modified analytical model...
Vertical handoff plays an important role to provide seamless connectivity for a mobile user in an overlapped multinetwork environment. On the other hand in order to maintain network stability, efficient management of available radio resource becomes crucial as network operators want high network utilization and maximum profit generation. For vertical handoff management, existing research works considered...
In wireless network, traditional TCP protocol has not the better solution to the problem of data loss. Then, we develop the new point to point TCP cross-layer design method (NTCP) based on RTS/CTS. NTCP divided traditional TCP protocol into transmission rate control and data integrity control, avoiding using the method of forwarding node information, use the most largely the wireless resource o The...
Road maps are important for several applications in vehicular networks. As a consequence, an updated map is essential for a proper behavior of such applications. In this paper, we focus on a map update application based on an infrastructure-to-vehicle communication with a high mobility. In order to understand the application's behavior, we analyze different performance criteria: System Goodput, Packet...
Wireless multimedia communications such as Video Transfer over Radio Interface (VToRI) is widely acknowledged as one of the key, emerging applications for wireless networks. They are becoming popular and are major revenue earners for wireless communication providers. As a service with real-time requirement, VToRI requires a low delivering delay under the constraint of bandwidth. Larger bandwidth and...
Advanced regulation machine (ARM) is determined to make the perfect parameters (AIFS, CWmin and CWmax) selections in the wireless networks platform. The simple but effective adjustment strategies of three parameters combinations are proposed with the priority theory to obtain the acquired high quality of service (QoS). The internal competitions models of various traffic analysis machines are delivered...
Uncertainty in wireless networks, such as time-varying delays and packet loss, often leads to instability and degraded performance in Networked Control Systems (NCS). Further, limited network resources impose constraints on communication between plants and controllers. In this paper, we use passivity combined with adaptive sampling to design a control architecture for trajectory tracking. The proposed...
In the next generation of wireless networks, mobile users can move among heterogeneous networks, using terminals with multiple access interfaces and non-real-time or real-time services. The most important problem in such environment is the Always Best Connected (ABC) concept permitting the best connectivity to applications anywhere at anytime. In this paper, we compare the performance analysis network...
This paper illustrates a semi-active handover algorithm on the integrated utilization of RSS and location, according to characteristics of a cellular network and WiFi. While connecting to a cellular network, MS (Mobile Station) is in the passive mode, where BS (Base Station) informs the MS to hand over on the basis of location information. In contrast, MS in the WiFi link chooses the optimal AP (Access...
We present the Arbitrating Value Transfer Protocol (AVTP), a deterministic binary countdown algorithm for multi-hop wireless networks. AVTP enables deterministic arbitration among contending nodes within a given hop radius, which may be chosen to reach network-wide arbitration, thereby exceeding the capabilities of existing protocols. In addition, the deterministic agreement on data values among all...
Routing path restitution approach to control and tolerate the congestion in routing models for mobile ad hoc networks is proposed in this paper. Packet loss in network routing is primarily due to link failure and congestion. The majority of present congestion control solutions do not possess the ability to distinguish between packet loss due to link failure and packet loss due to congestion. Here...
We investigated the use of caching of packets containing video at intermediary routers to reduce the delay and energy consumption of Automatic Repeat reQuest (ARQ) error recovery. We modeled the two mathematical programs that select the optimal set of routers to have caching ability, one to minimize energy consumption and the other to minimize retransmission delay. Both of these mathematical programs...
In this paper the bifurcation behavior of a TCP fluid flow model for Internet congestion control in Wireless Networks is investigated. These bifurcation behaviors may cause heavy oscillation of average queue length and induce network instability. An impulsive control method was proposed for controlling bifurcations in the Internet congestion control system. Simulation results show that the nonlinear...
This paper proposes a simple scheme to optimise the end-to-end user throughput of small, multi-hop wireless networks. The scheme which involves the introduction of small delays between successive packet transmissions at the source node has been tested on an indoor wireless mesh testbed for uni-directional flows of data traffic with nodes that use Chirp Spread Spectrum technology. Results from a series...
It was recently shown that the reverse carpooling technique can realize the benefits of network coding while requiring only a simple coding scheme that can be efficiently implemented in practice. However, when no opportunity for coding exists at an intermediate (relay) node, it needs to decide whether to transmit an uncoded packet or wait for the next opportunity to create a coded packet. While the...
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