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The IEEE 802.16 standard defines MAC and Physical layers for broadband wireless networks called WiMAX, however, it does not define the scheduling algorithm for the uplink and downlink traffic. In this paper, a predictive scheduling algorithm for uplink traffic in IEEE 802.16 networks is proposed. The proposed algorithm uses the cross-layer approach and is applied on the queue of the bandwidth requests...
In this paper, we propose a radio resource scheduling algorithm for a scheduler in IEEE 802.16 orthogonal frequency division multiple access (OFDMA) specification. The scheduler dynamically allocates slots considering wireless channel conditions of subscriber stations to improve radio resource utilization efficiency. The results show that with the proposed algorithm, smaller radio resources are used...
The WiMAX technology based on IEEE 802.16 is expected to support multimedia services with guaranteed quality of service (QoS). In this paper, a scheduler structure with priority classes is designed for IEEE 802.16 wireless networks, and a channel quality dependent rate-limited (CD-RL) algorithm is proposed. CD-RL provides promised data rates while taking throughput into account. With a carefully designed...
In this paper, we address the routing and call scheduling problem in which one has to find a minimum-length schedule of selected links in a TDMA (time division multiple access) based wireless network. As we deal with multi-hop networks, these selected links represent a routing solution (paths) providing enough capacity to achieve the routers requirements of bandwidth. We present a cross-layer formulation...
To investigate how to support user communication sessions in cognitive radio (CR), the radio technology should jointly perform power control, scheduling, and flow routing, which are generated by a multi-hop wireless network. With the adjustments of migrating nodes to neighboring nodes, a bandwidth footprint tree (BFT) is defined in this paper. Based on reducing hot spots approach, the distributed...
The IEEE 802.16 standard, which includes specification for the medium access control (MAC) and physical (PHY) layers, was designed to handle the requirements of different contemporary applications with diverse QoS requirements. IEEE 802.16 standard is equipped with signaling and bandwidth allocation algorithms that can accommodate many connections with a variety of QoS requirements at one subscriber...
Ethernet Passive Optical Networks (EPON) is a prominent solution for broadband access networks. However, little work has been done on emergency handling in EPON. In this paper, to manage emergency cases causing severe network traffic, the network state is divided into two states, i.e., the normal and the emergency states. The authors apply new priority- based Dynamic Bandwidth Allocation (DBA) algorithms...
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