The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The IEEE 802.16 is a well known set of standards, which have been developed for global deployment of Metropolitan Area Networks (MANs) in order to provide broadband wireless accesses supporting the integrated transmission of multimedia applications with different Quality of Service (QoS) requirements. In order to achieve the QoS requirements of multimedia applications, the IEEE 802.16 standards offers...
We propose a framework for optimizing the quality of service of multiple simultaneous flows in wireless access networks via network coding. Specifically, we consider the typical scenario in which multiple flows originate from multiple sources in the Internet and terminate at multiple users in a wireless network. In the current infrastructure, the wireless base station is responsible for relaying the...
In this paper, we proposed a dynamic network pricing scheme, which considers both Call Admission Control (CAC) and Network Congestion Control (NCC), denoted as Contract Binded CAC {CBCAC). CAC calculates the optimal arrival rates and limits the admitted calls at every time. When the network is underlized, all the users are charged for service consumption normally. But if it is congested, they are...
In this paper, we focus on the bandwidth allocation and reallocation scheme which uses multimode wireless access networks to guarantee the QoS of streaming services. The utility function for streaming service is proposed, which characterizes the rate adaptation and handoff delay in heterogeneous network scenario. The utility function for network provider takes into account the number of serving end...
In this paper, a centralized polling-based medium access (MAC) scheme, namely, the IEEE 802.11e hybrid coordinator function (HCF) controlled channel access (HCCA), is considered as an alternative to the current MAC protocol used in IEEE 802.11p for Wireless Access in Vehicular Environment (WAVE). At first, the limitations of the current enhanced distributed channel access (EDCA) are examined, and...
In Universal Mobile Telecommunication System (UMTS) Radio Link Control (RLC) losses severely affect the Quality of Service (QoS) due to high error probability. Therefore, for any video quality prediction model, it is important to model the radio-link loss behaviour. In this paper we evaluate the impact of the radio access network on the end-to-end QoS for H.264 encoded video. In order to characterize...
The following topics are dealt with: content-based image retrieval; mobile IP; ad hoc wireless networks; Internet routing scalability; wireless neutral access networks; service-oriented multi agent middleware; information fusion; MAC protocol; wireless sensor networks; QoS paradigm; file transfer service; mobile phones; avatars; virtual environments; VoIP; AQM routers; cloud SSO authentication; and...
Rapid development has equipped mobile devices with heterogeneous wireless access capabilities. A lot of work has been done on WLAN-3G integration to support seamless connectivity and global roaming. Most recent research trends focus on interwork gateway or intersystem roaming framework. In this paper, we introduce an application framework providing seamless connectivity for mobile devices across heterogeneous...
Heterogeneous wireless access networks (HWAN) will create a market for the delivery of an extensive collection of novel and attractive services and contents. Accounting and pricing the ubiquitous services will play a key role from both service providers and users point of view. By one hand, wireless service providers (WSP) look for the maximum revenue and utilization rate and by other hand users will...
Selecting the optimal service from a set of functionally equivalent services is non-trivial. Previous research has addressed this issue making use of Quality of Service (QoS) attributes of the candidate services. In doing this, researchers have however assumed that the customers' preference of the various QoS attributes varies linearly with the actual attribute values. In this work, we put forward...
Future metropolitan and access networks are expected to comprise both heterogeneous optical and broadband wireless technologies. In this paper, we envision and then investigate the architecture of one of these scenarios by assuming the WMN technology as a wireless access network and the PON technology to serve in the backhaul. In such a system, many of QoS issues need to be highlighted. A cell planning...
In this work, we show how to control a Quality of Service in optical networks integrated with WiMAX access radio by means of the MPLS and WiMAX Class of Services, even in condition of traffic congestions.
Interoperability between heterogeneous wireless access networks will help the operators to improve the quality of service offered to the users and the networks resource utilization. Media Independent Handover (MIH) standard is designed by IEEE to optimize the handover between heterogeneous networks. This paper presents a solution for mobility management in heterogeneous networks which is based on...
The distributed wireless communications system is a new architecture for wireless access with multiple distributed relay stations (RSs). Instead of the traditional cellular system, the multihop cellular network for executing their data transmission can potentially augment coverage, data rates, and quality of service (QoS) performance. However, in the multiuser environment the multihop cellular system...
Contract-less wireless plans, in which customers are not locked into terms with providers, are becoming prevalent. The next step in this evolution is a contract-less competitive mobile wireless market in which a customer can, quite fluidly and seamlessly, choose to switch amongst wireless providers based on competitive terms at almost any time or place. This paper explores the concept and design of...
The fourth generation of mobile wireless networks (4G) is expected to be the most promising architecture for QoS provision due to its scalability, convenience for mobility support and capability of interworking heterogeneous radio access networks which ensure both session continuity and QoS support. One major design issue of the 4G is the support of optimized handoff functionalities. More specifically,...
This paper proposes a handover scheme using uplink and downlink channel quality information in order to improve the uplink channel performance during a handover process. The proposed scheme has two main features. First, the proposed scheme adopts the scanning process without an association process in order to obtain an uplink channel quality. Second, it designs the handover triggering and decision...
IEEE 802.16j mobile multi-hop relay network is proposed to enhance the system coverage, user throughput and the capacity of fixed/mobile broadband wireless access system in IEEE 802.16d/802.16e. Relay station (RS) enables data transmission between base station and end user when the channel is not good for transmission. Besides, one relay station also communicates with a pair of other relay stations...
The architecture for the Beyond 3rd Generation or 4th Generation wireless networks aims at integrating various heterogeneous wireless access networks over an IP backbone. To provide seamless mobility, one of the design issues is the vertical handoff support. In this paper, we propose a SINR (Signal to Interference plus Noise Ratio) and AHP (Analytic Hierarchy Process) based SAW (Simple Additive Weighting)(SASAW)...
Circuit-Switched (CS) Voice Services over HSPA (CSoHS) was recently introduced for 3GPP WCDMA Release 7/8 systems. The benefits of this feature include improving voice and data system capacity by utilizing the enhancements offered by the shared packet transport of HSPA air interface while preserving the already widely deployed core networks. In this paper, we discuss the operation and implementation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.