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In this paper, we propose a new routing algorithm which calculates bandwidth-delay constrained routes in the fast and efficient manner. The algorithm is designed for the software-defined backbone networks, where the control plane is separated from the data plane and logically centralized. Besides providing the required quality of service (QoS), the algorithm aims to maximize utilization of network...
In this paper, we consider the problem of cross-layer radio resource management in heterogeneous networks (HetNets) with flexible backhaul, which aims at minimizing the total transmit power of base stations (BSs) while guaranteeing the average end-to-end data rate requirement of each data flow. We formulate the problem as a two-timescale stochastic optimisation, where the long-timescale control variables...
One of the main advantages of utilizing flexible backhaul in future HetNets is that it can provide better user experience through flexible resource allocation. For this purpose, it is important to provide the required quality of service (QoS) in such networks. In this paper, we consider the problem of cross-layer radio resource management in HetNets with flexible backhaul which guarantees minimum...
This paper proposes an improved mesh path selection protocol for QoS support in wireless mesh network, while avoiding the inherent problems of proactive and reactive path selection elements. The proposed ‘Advanced Selective Greedy’ (SelG+) path selection protocol operates in two phases. In the first phase it constructs a set of potential forwarders for every mesh stations. In the second phase during...
A multicommodity Minimum-Cost Maximum-Flow algorithm for routing multiple unicast traffic flows in infrastructure wireless mesh networks, represented as commodities to be routed in an undirected or directed graph, is presented. The routing-cost per edge can be any metric, i.e, a delay, a SNR, etc. To minimize resource-usage and transmission power, the routing-cost is formulated as a Bandwidth-Distance...
Network Coding is a new field that aims at, notably increasing the throughput in a network. ROCX [1] is an algorithm that makes routing with the awareness of network coding. However, its major limitation is that it does not take into account the bandwidth limitation and the interference impact. If the interference is not considered in a wireless network, a flow requiring a certain bandwidth might...
In this paper, a routing protocol with (end-to-end) QoS support is proposed by giving routing access to bandwidth information. Topology-transparent scheduling (TTS) is chosen as the medium access control (MAC) in both the control and data channels. Based on the information collected in the control channel, bandwidth estimation and reservation at individual nodes are developed to efficiently utilize...
With the growing popularity of video communications in wireless ad hoc network, cross-layer design (CLD) provides a novel technique that can dynamically accommodate its policy to time-varying channel condition and guarantee different Quality of Service (QOS) in real-time video transmission. In this paper, to minimize the distortion of real-time video transmission, we propose a cross-layer optimized...
In the recent years, multipath routing techniques are recognized as an effective approach to improve QoS in Wireless Sensor Networks (WSNs). However, in most of the previously proposed protocols either the effects of inter-path interference are ignored, or establishing low-interference paths is very costly. In this paper, we propose a Low-Interference Energy-efficient Multipath ROuting protocol (LIEMRO)...
Explicit path setup and constraint-based routing make Multi Protocol Label Switching (MPLS) a suitable technology to consider QoS constraints of the user and traffic engineering (TE) objectives of the provider. This work focuses on the problem of selecting bandwidth guaranteed path for MPLS based networks. The selected path should also fulfill the provider's objective of reducing the blocking probability...
Anycast is a new service of IPv6. How to guarantee its quality of service(QoS) has become an important subject. An anycast QoS routing algorithm supporting traffic engineering(ART) in multi-protocol label switching(MPLS) networks is proposed. In order to select a QoS path for client's bandwidth request, information regarding the source-destination pairs is used to reduce the interference between current...
Recently, because of the rising popularity of multimedia applications and potential commercial usage of MANET(Mobile Ad Hoc Network)s, and the limited bandwidth and dynamic topology in MANETs. providing required bandwidth for these applications in MANETs has become an unavoidable and urgent task to achieve sufficient QoS (Quality of Service). Time slot assignment is essential to provide the calculated...
In this paper, we consider the important aspect of quality of service (QoS) in wireless mesh networks, focusing on packet delays and packet drops. We observe that the options of solely focusing on throughput, and of only depending on the QoS type characterization by the application level protocol is not sufficient. We propose the use of multiple queues to hold the packets based on their QoS requirement...
One of the most promising wireless technologies is Wireless Mesh Network (WMN). The aggregate capacity of wireless mesh networks can be improved significantly by providing each node with several Wireless Network Interface Cards (WNICs) and by using multiple channels in order to minimize the interference and to provide high performance in such networks. However, multiple WNICs in each node requires...
The demand for QoS has made its support an essential component in today's wireless networks. The use of directional antennas in multi-hop wireless networks is known to provide substantial increase in the utilization of the wireless medium. However its effectiveness in providing QoS assured routing is unexplored. In this paper, we study the problem of bandwidth guaranteed routing in contention-based...
Wireless interference can make a significant impact on the performance of a wireless network. The paper studies TDMA-based timeslot allocation to schedule links efficiently under RTS/CTS interference model of wireless networks, and presents an efficient distributed timeslot assignment algorithm. In addition, the paper presents an effective heuristic algorithm for calculating end-to-end bandwidth on...
Initial entry during deployment requires tactical networks supporting voice, video, and data requirements to be established quickly given little existing telecommunication infrastructure. Wireless mesh networks using contention-based medium access control (MAC) appear to be an easy off-the-shelf solution, but their performance is lacking for support of such diverse high-bandwidth low-latency requirements...
A distributed scheduling approach for fast deployable tactical IEEE 802.16e networks is presented where distributed base stations with dual radios form a mesh backhaul and mobile battle units communicate through these base-stations. The mesh backhaul is formed via an IEEE 802.16e mesh mode radio on each base station, while mobile units communicate with base stations via PMP mode radios. The scheduling...
Multiple-input-multiple-output (MIMO) transceivers can take advantage of random channel fading and multi-path delay spread for multiplying transfer rates (multiplexing gain), improve transmission quality/reliability (diversity gain) at no cost of extra spectrum, or allow the spatial separation of the signals of different transceivers in a multi-user scenario, thus providing a multiple-access gain.
Energy-efficiency is a key problem in wireless sensor networks(WSNs) due to the severe power constraint of wireless nodes. When designing protocols for WSNs, it is important for us to consider not only network performance, but also energy consumption. It is difficult for a traditional layered design method to satisfy several objectives at the same time. In this paper, we introduced a cross-layer scheme...
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