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WiMAX cellular packet networks have become an attractive solution for many applications these days. One of the main reasons for that, is the QoS support that WiMAX provides. An important part of the WiMAX QoS framework is the scheduling services defined for different types of traffic and the uplink BW allocation mechanism associated with these scheduling services. These 5 uplink scheduling mechanisms...
The interaction between wireless optimized scheduling algorithms and TCP congestion control mechanisms can have adverse effects on the performance of the system. We focus on the queue based max-weight (QBMW) scheduler, a scheduling strategy which is known to be throughput-optimal under unregulated traffic sources. We use fluid modeling to describe the time evolution of the congestion window size and...
Packet scheduling algorithms are viewed as one of the key mechanisms for increasing the diversity order, robustness and effectiveness of a wireless multi-user communication system. Traditional packet scheduling are mainly designed for homogeneous single traffic scenarios. In this paper we present a novel scheduling algorithm that support real-time (RT) and non real-time (NRT) traffics at the same...
Packet scheduling over shared channels is one of the most attractive issues for researchers dealing with radio resource allocation in wireless networks as modern systems' different traffic types, with different application requirements, need to coexist over the air interface. Recently, attention has been attracted to multicarrier techniques and the application of cross-layer approaches to the design...
The traffic in the high-speed wireless multimedia network will be a mixture of voice, video and data messages having a large variety of characteristic and inherent requirement. The present work is a medium access control protocol for time division-code division multiple access system to distribute the available bandwidth among the mixture of different traffic classes depending upon their quality of...
OFDMA-based relay-enhanced cellular systems have been proposed as a promising solution for the next-generation wireless communications. The deployment of relay stations (RS) in cellular networks makes resource scheduling a more crucial and challenging task. In this paper, a novel centralized scheduling scheme called centralized scheduling with void filling (CS-VF) is proposed for two-hop relay-enhanced...
We have recently introduced in the literature MI-MAC (Multimedia Integration Multiple Access Control), a new access control protocol for next generation wireless cellular networks which showed superior performance in comparison to other (TDMA and WCDMA-based) protocols when integrating various types of multimedia traffic. In this work, which to the best of our knowledge is one of the first in the...
In this paper, we consider a predictive and distributed slot allocation scheme for transporting multi-class traffic over TDD-CDMA cellular networks with multiple cells, designed to maximize a general utility function that is concave increasing. We formulate the utility-maximizing slot allocation problem as a nonlinear integer programming problem, and provide a solution that can be realized efficiently...
When transmitting stochastic traffic flows over wireless networks, there exists an inherent tradeoff between average transmit power and corresponding queuing-delay bound. In this paper, we investigate such a trade-off and show how average power increases as delay-bound requirement becomes stringent. Specifically, we propose the resource allocation schemes to minimize the power consumption subject...
This paper presents an analysis of hybrid delay/blocking systems with data quality of service (QoS) subject to bursty elastic data traffic, and with wide application to wireless access networks. A key result is that the performance of low priority background traffic for both data resource allocation schemes studied (FRA and RREFS) is largely independent of the burstiness of the traffic. Indeed, the...
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