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In mobile ad hoc networks, routing protocol area is a challenging issue. In spite of recent research, MANETs lack load balancing capabilities, and thus, they fail to provide expected performance especially in the case of a large volume of traffic such as real time traffic. In this paper, we propose a simple but very efficient algorithm to support Quality of Service (QoS), by the use of load-distributing...
This paper proposes a novel admission control (AC) algorithm for guaranteed quality of service (QoS) to all users. The proposed solution provides better utilization of system capacity using adaptive modulation (AM). A scheduler based on a per user priority function is also given in this paper. The AC is given by allocating the exact number of slots for each user that will meet its QoS. For every new...
It is being envisaged that a wide variety of applications can be running on vehicular ad hoc networks (VANETs) in the near future. The coexistence of these applications suggests that they will be competing for the use of the wireless medium. That easily leads to severe congestion and even “hotspot” problem in high traffic density urban areas, and results in the failure of time-critical applications...
Like most wireless network protocols, IEEE 802.15.4 adopts a CA (Congestion Avoidance) algorithm to avoid early collisions of new frames by randomizing its first transmission delay instead of delivering them immediately. The traditional CA scheme of IEEE 802.15.4 selects its random access time from the predetermined range without considering the degree of underlying network congestion. This static...
The Transport Control Protocol (TCP) has been widely used in wired and wireless Internet applications such as FTP, email and HTTP. However, performances of traditional TCP congestion algorithms degrade significantly when deployed over wireless networks. In this paper, we proposed an improved TCP congestion control algorithm for wireless networks, named TCP-FIT, and compared its performance with existing...
In this work, we propose a novel combined packet scheduling and call admission control to provide a stable video streaming service to large numbers of subscribers over WiMAX network. First, the proposed call admission control algorithm estimates the expected network throughput in the near future by using a measurement-based local linear model and the control parameter of the proposed scheduling algorithm,...
In this paper, an admission control (AC) scheme is proposed for handling multiclass Grade of Service (GoS) and Quality of Service (QoS) in Uplink Long Term Evolution (LTE) systems. GoS requirement in conjunction with QoS has been seldom taken into account in previous admission control and resource allocation algorithms for LTE uplink. We propose a novel algorithm for handling the priorities while...
Multimedia real-time traffic is deemed to be dominant in future communication systems. One of the reference applications to support real-time traffic is the Real-time Transport Protocol (RTP), which can be used to transmit multimedia contents on real-time basis. At the same time, Real-time Transmission Control Protocol (RTCP) is used for receiving feedback and getting information about the network...
WSN is an emerging technology which is deployed for monitoring and control applications. IEEE has introduced the 802.15.4 standard for a low rate, low power, low complexity and short range Wireless Personal Area Network (WPAN) in 2003. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) is defined as the basic access mechanism in the standard. It was noted that there is a problem of low...
Quality communication over the wireless channel is now promised because of the advent of the broadband wireless. High speed data access is expected to be provided to subscribers through broadband wireless access. We propose a joint Call Admission Control (CAC) and Bandwidth Allocation (BA) for an IEEE 802.16 based WiMAX system. The presented schemes aim to provide QoS support along with a fair resource...
The warning system is required to preserve viability and ability from diversified air threats. The unidirectional satellite multicast system, the new system has attracted attention as an alternative. The system is similar to a unidirectional satellite link. To improve link reliability, the unidirectional satellite link uses a flow control. But it is unsuitable for the unidirectional satellite multicast...
The IEEE 802.15.4 standard is able to achieve low-power transmissions in low-rate and short-distance wireless personal area network (WPAN). The slotted carrier sense multiple access with collision avoidance (CSMA/CA) is used for contention mechanism. Sensor nodes perform backoff process immediately when the clear channel assessment (CCA) detecting busy channel. It may neglect the implicit information...
In this article, we present a survey of Wireless Sensor Networks (WSNs) existing Transport Protocols. We have evaluated the design concepts of different protocols based on congestion control, reliability support and source traffic priority support. Then we draw the concluding remarks, while highlighting up-and-coming research challenges for WSN transport protocols, which should be addressed further...
We propose a simple unified analytical model to analyze the IEEE 802.11 DCF infrastructure BSS performance in terms of MAC delay, PLR, and throughput efficiency under non-homogeneous and non-saturation conditions. Our model accounts for: (i) asymmetric traffic load between an AP and its associated STAs of an infrastructure BSS; (ii) transition from the non-saturation to saturation mode (and vice-versa)...
There is an exponential rise in awareness, reliance and usage of the Internet protocol (IP) network. The advent of multimedia applications on the IP network, such as, voice over IP, streaming audio and video, etc, has contributed immensely to the congestion on the broadband network. The increase in the number of users who rely on peer to peer (P2P) protocols to allow transfer of very large files and...
The vehicle control system based on Network communication becomes increasingly complicated recently. The traditional research only focuses on the improvement of network communication quality or system control performance. The network configuration had been carried out to study the vehicle chassis integrated control system. Based on the MATLAB/Simulink and TrueTime Toolbox, the distributed CAN network...
Random Early Detection (RED) algorithm, a framework of active queue management (AQM), has been proposed in order to improve the performance of congestion routers due to the increased use of Internet. But, the basic problem of a lag between congestion's occurrence and its remedy remained. To overcome this problem of RED, Explicit Congestion Notification (ECN) proposed by the IETF that allows end-to-end...
The emergence of Wireless Sensor Networks (WSNs) have introduced a new research area known as Body Sensor Networks (BSNs) that hold great promises to facilitate various pervasive monitoring services ranging from home automation, to remote healthcare and military surveillance. The performance of this resource-constrained network, is however, highly restricted by its error-prone characteristic, resulting...
Active Queue Management (AQM) plays a very important role in congestion control of Transmission Control Protocol/Internet Protocol (TCP/IP) networks. This paper attempts to design an improved proportional-integral-proportional-derivative (PI-PD) controller as an active queue manager for TCP routers. The proposed controller scheme controls present congestion reactively and also avoids the incipient...
Last year, the official BitTorrent client switched to LEDBAT, a new congestion control algorithm targeting a lower-than Best Effort transport service. In this paper, we study this new protocol through packet-level simulations, with a special focus on a performance comparison with other lower-than Best Effort protocols such as TCP-LP and TCP-NICE: our aim is indeed to quantify and relatively weight...
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