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Worldwide Interoperability for Microwave Access (WiMAX) supports high bandwidth, broadband access, mobility, and Quality of Service (QoS) guarantee. Load balancing is required due to uneven distribution of traffic among different WiMAX base stations (BS) as well as mobility of WiMAX Subscriber Station (SS). Cell breathing is a well-known load balancing technique adopted in wireless networks. By changing...
In this report we presents an overview of the Capacity of Code Division Multiple Access (CDMA) Systems. In the past, it has been shown that CDMA is the most suitable multiple access transmission technology for Mobile Communications and all the 3rd Generation Mobile Communication Standards suggest CDMA for the Air-Interface. The head reason for the powerty of this technology is the large increase in...
When many cellular users take high capacity transit (HCT), a group of mobile terminals (MTs) may have to initiate handoffs and location updates more or less at the same time, which will cause congestion on the random access control channel (RACH), leading to many handoff and location update failures. To overcome this problem, we propose a new scheme, called GHA/RALU (Group Handoff Avoidance/Rate Adjusted...
This paper considers the energy saving problem of IEEE 802.16e networks which consist of a base station and multiple mobile stations. The mobile station may establish one or multiple connections that have specific QoS requirements, including a bandwidth requirement and delay bounds. Since the mobile station turns off the transceiver to save energy when all connections of the mobile station enter sleep...
The mobile networks must have an ability to maintain an acceptable level of service during network failures to provide high resilience against service failures. This paper presents an eccentric fault tolerant path grouping scheme that can achieve mobility independent Quality of Service (QoS) guaranteed services in Generalized Multiprotocol Label Switching (GMPLS) based wavelength-switched optical...
The research proposes a path selection algorithm for multihomed hosts attached to Heterogeneous Wireless Networks (HWN) for maritime wireless communications. We first review the state-of-the-art of the Multihoming technology and explain rationale behind Multihoming. The Multiple Attribute Decision Making (MADM) is also introduced to address the importance of multiple attributes for path selection...
Fractional Power Control (FPC) has recently been standardized for the uplink in the Long Term Evolution of UMTS mobile radio networks (LTE). The behavior of FPC is mainly governed by two cell specific parameters, the path loss compensation factor and the power offset. Radio network operators face the problem to plan these parameters for LTE network deployments. In this work we establish a system of...
Unassumed teletraffic patterns, such as those caused by extra-high bit-rate mobile user traffic that actively moves in a network, will be become common in telecommunication networks in the 4th generation (4G) era. The unexpectedness and unevenness of their distribution will make it difficult to use "fundamental traffic," which is the conventional concept of reference traffic, especially...
This paper explores the possibility of fast and automatic hole detection using improved half wave power spectral detection. A radio that can sense and understand its local radio spectrum environment, to identify temporarily vacant spectrum and use it, has the potential to provide higher bandwidth services, increase spectrum efficiency and minimize the need for centralized spectrum management. In an...
The aim of this work is wireless network design and optimization. The well-known Shannon-Hartley formula describes the achievable bitrate of a noisy transmit channel. The downlink air-interface of UTRAN Long Term Evolution (LTE) seems to closely follow such a law, when it is modified with appropriate bandwidth and signal to noise ratio (SNR) efficiency factors. Motivated by this observation, we address...
In WiFi networks, mobile nodes compete for accessing a shared channel by means of a random access protocol called Distributed Coordination Function (DCF). Although this protocol is in principle fair, since all the stations have the same probability to transmit on the channel, it has been shown that unfair behaviors may emerge in actual networking scenarios. Assuming that a contending node can dynamically...
Cooperative forwarding in wireless networks has shown to yield benefits of rate and diversity gains, but it needs to be incentivized due to the energy and delay costs incurred by individual nodes in such cooperation. In this paper we consider an incentive mechanism called Bandwidth Exchange (BE) where the cooperating nodes flexibly exchange the transmission bandwidth (spectrum) as a means of providing...
We carry out a comprehensive analysis of a range of wireless network efficiency considerations. Firstly, we explore the properties and the implications of the power-versus bandwidth-efficiency criteria. Secondly, we perform a detailed top-down analysis of a typical commercial wireless network, which emphasizes the inherent differences between the aforementioned two efficiency metrics, while demonstrating...
In this paper, we focus on proactive radio resource management schemes that retain the quality of the individual connections by pre-reserving the needed resources in a cellular network. We propose a new scheme, which improves older proactive solutions. Typically, in such solutions an improvement in call dropping probability negatively impacts new call blocking probability. We improve this framework...
This paper focuses on the issue of flow distribution for multimode mobile terminals in heterogeneous networks, and proposes a flow distribution algorithm based on priority and weight self-production mechanism. The algorithm utilizes the notion of "priority" , assigning higher priorities to more important sessions, therefore ensuring these sessions have the preferential utilization of the...
In many communication systems, two or more traffic links are merged together to form a common trunk line. Usually, a Markovian technique is used to determine the different traffic parameters of aforementioned combined trunk line. But the technique does not hold good and also the Markov chain takes a complex shape for a network where offered traffics are more than two different types. In this paper,...
The wireless mobile nodes are self-powered and energy-sensitive. It is critical to prevent rapid energy dissipation while streaming high quality video over wireless. We investigate the energy consumption mode of mobile nodes and propose an energy-aware scheme for efficient streaming of MPEG-4 FGS video over multiple paths in wireless. We calculate the decoding aptitude of each FGS-coded frame before...
Known for their capability of being deployed 'on the fly', and resilience to dynamically 'heal' around failed network elements, wireless mobile ad hoc networks (MANETs) are gaining widespread momentum both in the commercial and military sectors. The success of MANETs is however critically tied to the amount of network capacity available to transport a wide spectrum of applications that the MANETs...
In this paper, we introduce and evaluate ScaleMesh, a scalable miniaturized dual-radio wireless mesh testbed based on IEEE 802.11b/g technology- ScaleMesh can emulate large-scale mesh networks within a miniaturized experimentation area by adaptively shrinking the transmission range of mesh nodes by means of variable signal attenuators. To this end, we derive a theoretical formula for approximating...
Based on an identification and evaluation of the subtle counterproductive interactions between the WLANs MAC layer and the transport layer, this paper shows a new approach towards congestion control for WLANs. We introduce a specialization of TFRC (MTFRC: mobile TFRC), which is adapted to wireless access networks. This TFRC specialization requires only slight changes to the standard TFRC protocol...
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