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Access networks based on cooper cables are costly to build and maintain. For this reason, last-mile access networks based on wireless technologies are gaining considerable attention. Among the wireless technologies being employed, the IEEE802.11 is common place. In such scenarios it is important to have well defined mechanisms to better evaluate traffic characteristics and overall system performance...
Mobility in a wireless heterogeneous scenario in which the mobile devices are able to connect to more than one access technology requires a new architectural development for the network connectivity management. The present paper describes and evaluates a set of architectural options for integrating the novel network discovery and selection functionality in the 3GPP evolved packet core which enables...
Over the last few years we are deploying various kinds of radio access technologies (RATs). Different kinds of RATs are being deployed in overlay, providing different services in terms of their bandwidth, coverage, Quality of Service (QoS), price, etc. Under the multi-radio overlay network environment RAT selection becomes an important issue for efficient use of radio access networks. One of the most...
Next generation mobile radio networks of IMT Advanced systems family will offer ubiquitous broadband high area coverage, at up to 1 GBit/s in cities and 100 MBit/s in rural areas and QoS support in terms of throughput and low delay. Candidate technologies like 3GPP-LTE, WiMAX, as well as the WINNER system design are based on OFDMA transmission for flexible radio resource allocation, scalable and adaptable...
In order to offer a better QoS during L2 handover of a mobile station, we propose in this paper to compare the performance of the two L2 HO techniques: Soft and Hard handover for different types of traffic with same architecture IEEE 802.16e in an urban area (City).
In this paper, we propose a Call Admission Control-based dynamic pricing scheme that aims at preventing congestion and maximizing the utilization of broadband wireless access systems. The main aim of our scheme is to provide monetary incentives to users to use the wireless resources efficiently and rationally; hence, allowing efficient bandwidth management at the admission level. By dynamically determining...
The following topics are dealt with: information resource management and QoS; image processing and pattern recognition; wireless networking and information networks; distributed and multi-agent systems and data mining.
A variety of wireless network technologies have been developed and deployed, including GSM, UMTS, WiFi and WiMAX. The advantages of having an integrated heterogeneous wireless network environment include seamless communications, joint resource management and adaptive quality of service. In such environment, operators would not need to reject the service requests, but redirect them to appropriate networks...
Wireless mesh networks are emerging as a promising access network architecture. In this work, we report on an extensive measurement campaign performed over an experimental WiFi-based mesh network, deployed in an office building environment. The measurements are focused on the performance of HTTP traffic. Results demonstrate the existence of an unfairness issue, whereby longer sessions achieve better...
In this paper we propose cooperative/noncooperative operation models for revenue seeking spectrum brokers who coordinate to manage access to the same spectrum bands in adjacent areas. We consider a setting where users of spectrum are involved in peer-to-peer links with QoS requirements. Each wireless transmission (link) is priced collectively by all revenue seeking brokers whose responsibility areas...
One of the key features of emerging and future wireless systems is the continuous increase in the number and diversity of available radio access technologies. A great number of research efforts in the past decade have focused on ways to more efficiently exploit the various wireless access technologies. Among the recent trends in this direction are cognitive wireless networks and systems, targeting...
Mobility enhancement and carrier aggregation are important aspects to investigate as part of the LTE-Advanced study. Hard handover is the only handover scheme in LTE Rel-8. Generally, hard handover is fairly simple, but its outage probability is high and the handover procedure may be unreliable, especially for VoIP service. In this paper, we propose a fractional soft handover scheme based on the carrier...
Explosive development of multimedia services in actual data networks and the increasing demand for service quality stimulate the interest in the QoS management research. In order to ensure the service quality for multimedia flows crossing heterogeneous domains several resource management entities should cooperate to fulfill this task. In this paper we will present a QoS management system for WiMAX...
The convergence of radio access technologies with all-IP core network has gained significant attention recently. Through the all-IP based policy and charging control (PCC) architecture standardized in 3GPP R8, the charging rules are consistent with application-level and IP-level policy control. It is essential to investigate the signaling overhead incurred by PCC and the OCS management during the...
This paper presents a novel mechanism which avoids wireless cellular radio access network congestion caused by signaling traffic simultaneously generated by many mobile phones. It applies to the Mobility Management (MM) signaling of the Radio Resource Management (RRM) protocol (cell update procedure). It uses a cell reselection algorithm which decides on which cell UE is camped on when in idle mode...
With the deployment of next generation (4G) mobile radio systems an additional radio access network is established. A variety of different Radio Access Technologies (RATs) will be operated in parallel. In this framework, the Long Term Evolution (LTE) system, specified by 3GPP, will have to co-exist with WiMAX, mobile 2G/3G networks and Wireless Local Area Networks (WLANs). To cope with this increasing...
In recent years, a variety of wireless network technologies have been developed and deployed, including UMTS, WiFi, and WiMAX. The overlapping of different networks creates heterogeneous wireless environments, which can enable seamless communications, joint resource management and adaptive quality of service. In such environments, operators do not need to reject user requests, but redirect them to...
Compared to WCDMA, the LTE radio access has a significantly shorter Transmission Time Interval (TTI) in order to reduce end-to-end delays. However, if a User Equipment (UE) at the cell edge is limited by its available transmission power, it may not be able to transmit an entire VoIP packet during one TTI, since the instantaneous source data rate is too high. Thus TTI bundling has been recently introduced...
This paper presents the architecture, design, implementation and samples of tests performed on a testbed for IEEE 802.16/WiMax access technology while used in a multi-domain environment IP networks. The final target was to implement a system capable to offer connectivity services, with different levels of end to end QoS guarantees, adaptable to different applications. Flexible solutions are proposed...
In the future mobile systems, various wireless access technologies will exist simultaneously and constitute a complicated heterogeneous networks environment. Considering the users' services satisfaction, a novel network selection algorithm based on dynamic weight setting is proposed in order to solve the existing problems that there is not a tradeoff between users' preferences and network conditions,...
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