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Worldwide Interoperability for Microwave Access (WiMAX) deployment is growing at a rapid pace. Since Mobile WiMAX has the key advantage of serving large coverage areas per base station, it has become a popular emerging technology for handling mobile clients. However, serving a large number of Mobile Stations (MS) in practice requires an efficient handover scheme. Currently, mobile WiMAX has a long...
In this paper, we propose a general model for the broadcast polling protocol of unsaturated IEEE 802.16 networks in which each subscriber station has a finite buffer. A subscriber station can be modelled as a M/G/1/K queue with its service time determined by the broadcast polling protocol. The buffer overflow probability, network throughput and packet delay performances are analyzed. The proposed...
In this paper, we propose a novel routing protocol, WLAN-WiMAX Double-Technology Routing (WWDTR), for routing packets in the heterogeneous vehicular network. Any given route in the protocol can be generally formed of a combination of WLAN and WiMAX hops. WWDTR uses the position-based routing approach over the parts of the route in which packets are forwarded via WLAN radios, in order to handle relatively...
Real-time Internet services such as video transmission and online gaming often require privileged treatment in the Internet routers and wireless links in order to meet their real-time QoS requirements. The challenge is to know which are the services requiring higher priority and when this special treatment is needed. In this study, we introduce mechanisms to intelligently classify different traffic...
As high speed rails become more and more popular, providing broadband internet access on high speed rails is not widespread due to the large inter-carrier interference, terrestrial obstacles and inherent carriage shielding. In this paper an integrated Worldwide Interoperability for Microwave Access-Radio over Fiber (WiMAX-RoF) system is proposed and deployed along Taiwan High Speed Rail (THSR) rail...
As DCF (Distributed Coordination Function) in IEEE 802.11 standard adopts distributed contention with random back off time, it results in uncertainty and packet delay and jitter. It is not suitable for real-time data transmission and cannot meets the needs to access media resources at fixed time interval for some application, such as VoIP. This paper proposes a TDMA-like distributed multiple access...
WiMAX (Worldwide Inter-operability for Microwave Access) is an emerging wireless technology standard, which enables high-speed packet data access. To anticipate future demands of WiMAX technology, we propose an all-digital phase-locked loop (ADPLL) based frequency synthesizer for the WiMAX RF transceiver. The developed ADPLL targets frequencies from 2.3–2.7 GHz and from 3.3–3.8 GHz for low band and...
Multiparameter m-health scenarios with bandwidth demanding requirements will be one of key applications in future 4G mobile communication systems. These applications will potentially require specific spectrum allocations with higher quality of service requirements. Furthermore, one of the key 4G technologies targeting m-health will be medical applications based on WiMAX systems. Hence, it is timely...
WiMAX is one of the most interesting solutions for broadband wireless access, offering QoS features for multimedia traffics and applications. However, without the definition of a mandatory scheduling algorithm for the assignment of channel resources, WiMAX standard is open to enhancements by QoS research groups and developers. In this paper, BS uplink scheduling algorithms are considered and an innovative...
The WiMAX features longer transmission distance and more accomplished support of QoS than other wireless access technologies such as 802.11. Since the standard did not specify the QoS based packet-scheduling algorithms which run on the base stations, those algorithms are open for alternative implementations. In this paper, we propose a scheduling algorithm for burst traffic in the WiMAX base station...
For the reliable control of Micro Unmanned Aerial Vehicles (MUAV) using IP based networks it is of high importance to assure certain quality of service warranties for the transmission of control information. The mobile WiMAX standard IEEE 802.16e defines five QoS Classes which represent different requirements concerning data rate and delay. The scheduling scheme which is used to fulfill these requirements...
Today, the user is interested in comparing one service with another in terms of universal, user-oriented performance parameters which apply to any end-to-end service. The QoS concept encapsulates the idea that different data streams could be treated differently by the network depending upon the service being carried. QoS features shall provide the required performance of latency, jitter and packet...
TCP is the main transport-layer communication protocol in traditional wired networks. This is also due to its efficient behavior in presence of congestion events. However, networks with wireless links and mobile hosts provide significant non-congestive losses due to bit error rate, host motion and handover mechanisms. TCP incorrectly interprets these events as a sign of network congestion, throttling...
WiMAX is a Worldwide Interoperability for Microwave Access. The technology is specified by the Institute of Electrical and Electronics Engineers Inc., as the IEEE 802.16 standard that works on development of globally standardized protocols for wireless MAN and it has been commercialized under the name “WiMAX”. 802-16-2004 has often been considered the “fixed standard” or “fixed WiMAX” and 802.16-2005...
The handover performance in mobile network is the most important factor that can influence the Quality of Service (QoS). Today many countries in the world have migrated to more advanced mobile communication system such as the IEEE 802.16e mobile WiMax network. This mobile WiMax has been proven to be more stable and applicable for fixed, portable, nomadic and mobile network. The parameters such as...
For the past few years, wireless networks have played bigger role in connecting people. Demand for it services has increased tremendously. In order to provide better services and choices for high-speed internet access and multimedia service for business and residential customer, IEEE has come out with new solution. Started on 2001, IEEE 802.16 working group was developing the IEEE 802.16 standards...
The attention on WiMAX and WiFi technologies are rapidly progressing and now it is common to find them not just in laptops and personal digital assistants (PDAs), but in equipment as mobile phones, parking meters, security cameras and home entertainment equipment. A combination of WiFi and WiMAX deployment, will offer more cost-effective solution than a sole WiMAX or WiFi implementation. Its technology...
We analyze a sleep mode operation in IEEE 802.16m mobile WiMAX. We construct a 3-dimensional embedded Markov chain for the sleep mode with both uplink and downlink Poisson packet arrivals. We obtain the average power consumption and the average packet delay. The analytical results match with simulations very well. Performance evaluations show that there is a trade-off between the power consumption...
In this paper, we study Skype video call in LAN, WAN, and WiMAX. Our main interest is on traffic characteristics and user experience. Using the standard Foreman video sequence (320×240, 30fps, 8 second), we show that a Skype video call can adapt its source rate from < 5kBps up to ∼60kBps. The maximum achievable MOS (Mean Opinion Score) and EFR (Effective Frame Rate) is about 3.5 and 20 fps, respectively...
Radio Resource Management (RRM) techniques used in the Worldwide Interoperability for Microwave Access (WiMAX) can provide for many of the services and features promised by 4G wireless networks, such as supporting multimedia services with high data rates, and wide coverage area, as well as all-IP with security and Quality of Service (QoS) support. The IEEE 802.16 standard, associated with the WiMAX,...
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