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The development of Mobile WiMAX was considered to fulfill requirements for all major traffic types present today. This means that it will have to support voice, data and video, even simultaneously in real time applications. The hard handoff (HHO) is performed, when the connection to the serving BS is broken before creating the new connection with the target BS, but has a much poorer performance for...
Intelligent Transportation Systems (ITS) have been under development since the 80's as part of a global strategy for solving many of our modern life transportation problems. These systems enable people to reach their destinations in a safe, efficient, and comfortable way. In order to reach that goal, several radio access technologies (RAT) such as UMTS, WiFi, WiMAX and 5.9 GHz have been proposed for...
Dedicated WiMAX multimedia services are proposed for areas that lack networked infrastructure. This paper proposes multi-connection uplink video streaming for mobile WiMAX. Establishing multiple TFRC connections for a single video stream has emerged as a promising lightweight way of coping with wireless channel losses in a congestion-controlled tandem network. This study shows the impact (in terms...
One of the most important issues in offering real-time communication services in a mobile environment is support for seamless handover between base stations during a communication session. In Mobile WiMAX, a mobile station may have to perform a scan and association process before handover, but unfortunately, this scan and association process introduces service disruption. In this letter, we investigate...
One-way delay is an important metric to evaluate the performance of communication networks. In this paper, we analyze the one-way delay performance of the commercial WiBro networks based on the traffic measurement. In measurements, much large delay is observed in the uplink than downlink, and we find that such asymmetry due mainly to the impact of the uplink bandwidth request mechanism. Due to this...
The emerging mobile WiMAX (IEEE 802.16e) has gained serious attention as a means of providing wireless broadband access to mobile users. 802.16e supports high data rates and QoS for various applications, and is thus a powerful contender for next generation wireless access technology. On the other hand, IEEE 802.11 a/b/g/n have already been widely used to provide high data rates in a limited area....
With the IEEE 802.16e standard for mobile WiMAX the course for new 4G mobile radio communication systems is set. It offers significantly higher data rates than GSM or WCDMA/UMTS and supports different handover mechanisms and QoS features in contrast to WiFi (IEEE 802.11 g) on the OSI-layer 2 (L2). Since WiMAX-devices are hardly available today and protocol optimizations are strongly restricted with...
Currently, the vertical handover between different technologies presents a real challenge to overcome; the service interruptions during handover pose a real problem to users. In this paper we focus on this problem, and we propose the MSCTP protocol characterized by its multi-homing technique, as vertical handover mechanism between the IEEE 802.16e and the IEEE 802.11e networks, in order to reduce...
Mobile communications has witnessed an exponential increase in the amount of users, services and applications. New high bandwidth consuming applications are targeted for B3G networks raising more stringent requirements for Dynamic Resource Allocation (DRA) architectures and packet schedulers that must be spectrum efficient and deliver QoS for heterogeneous applications and services. In this paper...
This evaluation is intended to show through simulations, the performance of FBSS Handover mechanism in the case of high speed mobility with mobile WIMAX for multimedia. The model we propose for the evaluation, is close to a real case in life, where it is made up of a highway between two cities far from 145 km and responsible of vehicles traveling in both directions with relatively high speeds and...
Recently, requirement for a novel wireless network that has fast transmission, low cost, high efficiency and mobility support has increased. Mobile WiMAX Forum is leading next generation wireless network to provide the user's demands in broadband environment. However, problems that occur in MIPv6 (Mobile IPv6) still appear in Mobile WiMAX network. In this paper, we propose a scheme to increase the...
WiBro (Mobile WiMAX) is a broadband wireless internet service supporting for fixed, portable and mobile users, but enhancement of service quality in indoor environment is still necessary. WiBro femtocell is developed to expand cell coverage, increase system capacity and offer various multimedia service with high throughput in indoor environment. Three types of femtocell are designed according to the...
We review previous resource allocation algorithms for voice over IP (VoIP) services in Mobile WiMAX based on the IEEE 802.16e-2005 standard, and propose a new algorithm that allocates radio resources in the consideration of packet-size and packet-generation period variations of wireless VoIP codecs; hence, we can improve the efficiency of resource utilization in Mobile WiMAX. Through simulations,...
WiBro (Wireless Broadband) is a Korean version of Mobile WiMAX/IEEE 802.16e system, which is designed for mobile broadband wireless access. Being a subset of IEEE 802.16e, WiBro employs orthogonal frequency division multiple access (OFDMA) and time division duplexing (TDD) schemes operating at 2.3 GHz bands. In mid 2006, the world first commercial Mobile WiMAX service, based on WiBro specification,...
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