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In this paper, an efficient scheduling scheme for multi-hop networks based on IEEE 802.16j is proposed. In this scheme, the wireless resource is optimized in terms of slots and provides high throughput to Real Time Polling Services (rt-PS) class of data traffic. Further, a constraint based scheduling scheme for rt-PS services is also proposed. The proposed scheme is a feedback-based scheduling scheme...
The WiMAX (Worldwide Interoperability for Microwave Access) is a metropolitan area wireless network which provides high speed internet multimedia service and supports a variety of types of QoS (quality of service). Thus, it is important to allocate bandwidth to different class of traffic effectively in this network. The resource must be allocated effectively to guarantee the delay of real-time traffic...
IEEE 802.16 supports different scheduling services to grant Quality of Service (QoS) for multimedia applications. IEEE standard has not specified any scheduling algorithm for fulfilling QoS for different traffic classes. In this paper, we have modified the maximum Signal-to-Interference Ratio (mSIR) scheduling algorithm, where Bandwidth allocation to Subscriber Stations (SSs) is not only depending...
High mobility and need for data access with high speed, brings the Broadband Wireless Access (BWA) like WiMAX in forefront. IEEE Standard does not offer any standard scheduling algorithm and till now, it is an open issue for research. The objectives of the scheduling are resource optimization with high throughput and low computational complexity. In this paper, we propose a scheduling algorithm based...
In this paper, we propose a scheduling algorithm for mobile WiMAX networks that distributes dynamically the bandwidth among service flows while giving real-time packets more chances to satisfy their QoS requirements. The scheduling in the proposed algorithm is assisted by the subscriber stations, hence requiring two-schedulers, a scheduler at the BS and another one at the SS, where preemption is applied...
Relay stations can be deployed in a wireless network to extend its coverage and improve its capacity. In this paper, we study a scheduling problem in OFDMA-based wireless relay networks with consideration for multi-user diversity, channel diversity and spatial reuse. First, we present a Mixed Integer Linear Programming (MILP) formulation to provide optimum solutions. It has been shown by previous...
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...
Interest in Broadband Wireless Access (BWA) has been growing due to its high speed data rate, wide area coverage and support for Quality of Service (QoS) requirement for different applications. There is a need for better scheduler to handle diversified QoS while increasing system efficiency. In this paper, we propose an Improvised-Modified Deficit Round Robin (I-MDRR) that not only meets the QoS requirements...
IEEE 802.16 based Worldwide Interoperability for Microwave Access networks (WiMAX) are increasingly being deployed for last hop broadband wireless access. In order to provide the high speed access to information resources broadband technology like WiMAX is needed. In this paper we compared different uplink scheduling algorithms of WiMAX mainly maximum carrier to interference and noise (Max C/I) algorithm...
Packet scheduling in wireless network is one of the issues that requires attention to quality of service provision (QoS). In heterogeneous wireless network, whereby many packets of different QoS are involved, packet scheduling becomes more difficult. This paper presents packet scheduling algorithm that uses earliest deadline first for scheduling constant bit rate packets. We estimate the wireless...
The IEEE 802.16 standard defines wireless broadband access technology called Worldwide Interoperability for Microwave Access (commonly called fixed WiMAX). WiMAX introduces several interesting advantages including variable and high data rate, last mile wireless access, point to multipoint communication, large frequency range, and Quality of Service (QoS) for various types of applications. IEEE 802...
WiMAX is one of the most familiar broadband wireless access technologies that support multimedia transmission. IEEE802.16 Medium Access Control (MAC) covers a large area for bandwidth allocation and QoS mechanisms for various types of applications. Nevertheless, the standard lacks a MAC scheduling algorithm that has a multi-dimensional objective of satisfying QoS requirements of the users, maximizing...
Scheduling is a fundamental component in resource (bandwidth and power) management in NG wireless networks and plays the main role in providing QoS requirements such as delay, throughput and packet loss for different classes of service in 802.16d networks. In this paper we propose a novel scheduling algorithm Strict Priority Based Adaptive modulation and Coding (SP_AMC_Based) that can grantee QoS...
Earliest Deadline First (EDF) is a delay-optimal scheduling algorithm which is commonly used in real-time applications such as Voice over IP (VoIP) and Video on Demand (VoD) in wired and wireless networks. EDF calculates the deadline of a packet as follows: the latency parameter provided by the subscriber during admission control is added to the arrival time of the packet to form the packet deadline...
The ability to support quality of service (QoS) for a wide range of applications that exhibit different service requirements is a major competency of IEEE 802.16 networks. One of the keys to QoS provision is a scheduling algorithm that is able to determine the service ordering for packets from different service classes. This however is undefined in the standard to promote innovation by equipment vendors...
Mobile WiMAX's scheduling service is a key factor in Radio Resource Management (RRM) in realizing Quality of Service (QoS). The choice in scheduling algorithm for Mobile WiMAX base stations, albeit outside of the scope of the standard, critically impacts the performance and robustness of Mobile WiMAX networks. This paper provides an in-depth study of four major scheduling algorithms: Round Robin (RR),...
In this paper, we proposed a simple yet novel multicast scheduling scheme for IEEE 802.16e wireless metropolitan area networks. Specifically, we want to solve the problem that how the base station schedules the data in a multicast superframe such that mobile stations can receive their required multicast data and the total awake time of mobile stations is minimal. We first prove that this problem is...
As Scheduling for real time polling services (rtPS) is not defined in IEEE 802.16 standard, there are various approaches described to address this issue. IEEE 802.16 has detailed documents about the QoS parameter. However, they do not mention the scheduling algorithm to be used. The essential goals of this packet scheduling scheme are to guarantee the QoS parameter as well as provide fairness among...
A novel coordinated scheduling algorithm for OFDM-based systems in multi-cell scenario is proposed in this paper. The studied algorithm based on the utility function is general for the downlink of networks. The algorithm coordinates the subcarrier assignment over the BS cluster. We first establish the framework for this inter-cell coordinated optimization problem through utility-based method. The...
In this work, we propose a novel combined packet scheduling and call admission control to provide a stable video streaming service to large numbers of subscribers over WiMAX network. First, the proposed call admission control algorithm estimates the expected network throughput in the near future by using a measurement-based local linear model and the control parameter of the proposed scheduling algorithm,...
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