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In this paper, we identify and analyze the requirements to design a new routing link metric for wireless multihop networks. Considering these requirements, when a link metric is proposed, then both the design and implementation of the link metric with a routing protocol become easy. Secondly, the underlying network issues can easily be tackled. Thirdly, an appreciable performance of the network is...
Opportunistic Network Coding (ONC) has attracted much attention recently. The main improvement of ONC over the traditional network coding is that ONC allows the encoding node to decide whether it employs network coding based on the status of all its input streams. However, due to the nature of fading, wireless links may not always be reliable. Thus, the performance gain of ONC over traditional methods...
Wireless mesh networks (WMNs) are expected to be a next step toward future generation of wireless networks due to their rapidly deployable nature and to the wide variety of their potential use. On the other hand, the daily increase of multimedia applications over wireless networks has generated a vital need to provide Quality of Service (QoS) support in WMNs, and works in this area are not sufficient...
Because of the features of HAPs networks, TCP performance is challenged. In order to solve the TCP problems, optimization of TCP is researched in this paper. An optimized TCP for HAPs network (TCP-HAP) is proposed. It consists of three mechanisms which are rapid congestion notification, reason of packet loss recognition and traffic oriented congestion control. In TCP-HAP, the congestion message is...
Wireless Mesh Networks (WMNs) are primarily viewed as access networks, with traffic flowing in and out of the mesh via gateways. However, in many scenarios, point-to-point (P2P) traffic within the WMN is also important, with the approach used to handle this traffic affecting the performance of not only the P2P flows, but all other traffic as well. This work studies the handling of P2P traffic in the...
Wireless LANs carry a mixture of traffic, with different delay and throughput requirements. The usual way to provide low-delay services is to give priority to such traffic. However this creates an incentive for throughput sensitive traffic also to use this service, which degrades overall network performance. We propose to allow applications to trade off delay for throughput, without giving preference...
This paper proposed a random multi-access protocol STPRM-A (slotted three-dimension probability random multi-access protocol with acknowledgement) for wireless communication. Performance of STPRM-A was evaluated by mathematical expression of channel throughput and delay of packet. The characteristic comparison between STPRM-A and PDPMRM was present. Experiment and simulation results validated correction...
This paper proposed a novel algorithm based on Kolmogorov-Smirnoff(K-S) algorithm to detect the selfish behavior of nodes. Compared with the detection of transmitted number, the detection performance including speed and precision has been significantly improved. The radio conditions are not needed and capture effect would not impact the performance of the algorithm. Simulation experiments show that...
With the development of railway transit wireless communication technology, the existing test platforms about comprehensive test are facing new challenge of real-time problems. Aiming at the demand for Doppler Effect testing of domestic railway transit WLAN equipment and in consideration of the flaw of small bandwidth and relatively large delay of the channel emulator, this paper proposes a novel approach...
The effect of an arbitrary indoor infrastructure environment on the performance of a wireless multihop network is investigated. To this end, an accurate channel modeling tool based on 3D ray tracing is used first to evaluate the signal strength in different areas of the environment. Then, a discrete event simulator is applied to examine the performance of the network with two classes of routing protocols:...
This paper evaluates the applicability to WMNs of dynamic backpressure routing strategies, which theoretically maximize throughput but can result in high end-to-end delays. We present a distributed and (quasi-)stateless routing protocol called DiPUMP (forwarDIng of Packets for distribUted resource consuMPtion). Unlike the theoretical form of the backpressure algorithm, DiPUMP does not require a centralized...
In this paper, we propose a cross-layer scheduling scheme named DCLASA for the coordinated distributed scheduling of IEEE 802.16 WMN. This scheme considers the channel quality information (CQI) in physical layer when designing the timeslot allocation algorithm in MAC layer, and adjusts the node's holdoff exponent according to CQI. Meanwhile multi-user diversity and adaptive modulation and coding technique...
Wireless local area network (WLAN) has become more popular in recent years. With increase in demand users are expecting quality of service (QoS) for multimedia services in WLAN. The legacy protocol IEEE 802.11 and IEEE 802.11e does not provide QoS and fairness for converging traffic in WLAN, so efficient management of protocols are required to provide acceptable QoS for real time traffic and fairness...
Traditional scheduling algorithms are focused in maximizing system throughput considering a grade of fairness. However, maximizing the system throughput does not necessarily result in maximizing the number of satisfied users (users with a packet delay below a threshold). Also, the throughput maximization could cause a low grade of fairness. In this paper, we propose a scheduling algorithm that maximizes...
In wireless local area networks (WLANs), there could be several available access points (APs) around a Station (STA). How to select the most appropriate AP among those available APs has become a hot research topic. The conventional selection policy, which selects one AP with the best RSSI, makes the loads among APs be distributed unevenly and degrades resource utilization rate. Recently, several AP...
Recently, Long-Term Evolution (LTE) is the result of ongoing work by the Third Generation Partnership Project (3GPP) toward Fourth Generation (4G) systems. LTE will be used for mobile, fixed and portable wireless broadband access, and will offer several benefits to operators, aimed at increasing capacity, reducing network complexity and thus lowering deployment and operational costs. It will enable...
Emerging applications rely on wireless broadcast to disseminate time-critical information. For example, vehicular networks may exchange vehicle position and velocity information to enable safety applications. The number of nodes in one-hop communication range in such networks can be very large, leading to congestion and undesirable levels of packet collisions. Earlier work has examined such broadcasting...
The work described in this paper proposes two Smart Hybrid-Automatic Repeat Request (SHARQ) schemes with incremental redundancy, that are developed for a dual-hop network of two relays implementing cooperative communication. In a dual-hop network consisting of multiple relays, one of the most challenging tasks is to determine an appropriate trade-off point between the end-to-end block-error rate (BLER)...
Wireless mesh networks (WMNs) have attracted much attention lately for providing efficiently wireless services with high quality of service (QoS). Metropolitan WMNs are a low-cost solution for providing broadband wireless internet access in large areas. One of the fundamental issues of wireless communications is interference. In WMNs interference can be caused by simultaneous transmissions at links...
the mobile ad hoc network (MANET) is a temporarily organized computer multi-hop communication network which is composed of mobile hosts equipped with wireless transmitters and receivers. Considering human repair, this paper studied a M/M/1 queue model for damaged nodes in MANET where the service man applies N-policy. By assuming damaged nodes' arrival be subject to Poisson process, repair time and...
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