Two-Dimensional Mapping for Wireless OFDMA Systems

Ben-Shimol, Yehuda; Kitroser, I.; Dinitz, Yefim

doi:10.1109/tbc.2006.879937

Cited by 129 publications

(86 citation statements)

References 2 publications

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“…The comparison is limited to these two algorithms for various reasons. For example, Yehuda BenShimol et al [11] provide no details of how to map the resources to unused spaces if their sizes are over multiple rows. Andrea Bacioccola et al [12], assume that it is possible to have more than one burst per subscriber.…”

Section: Wimax Frame Structurementioning

confidence: 99%

Scheduling in IEEE 802.16e mobile WiMAX networks: key issues and a survey

So-In

Jain

Al-Tamimi

2009

IEEE J. Select. Areas Commun.

290

182

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Abstract-Interest in broadband wireless access (BWA) has been growing due to increased user mobility and the need for data access at all times. IEEE 802.16e based WiMAX networks promise the best available quality of experience for mobile data service users. Unlike wireless LANs, WiMAX networks incorporate several quality of service (QoS) mechanisms at the Media Access Control (MAC) level for guaranteed services for data, voice and video. The problem of assuring QoS is basically that of how to allocate available resources among users in order to meet the QoS criteria such as delay, delay jitter and throughput requirements. IEEE standard does not include a standard scheduling mechanism and leaves it for implementer differentiation. Scheduling is, therefore, of special interest to all WiMAX equipment makers and service providers. This paper discusses the key issues and design factors to be considered for scheduler designers. In addition, we present an extensive survey of recent scheduling research. We classify the proposed mechanisms based on the use of channel conditions. The goals of scheduling are to achieve the optimal usage of resources, to assure the QoS guarantees, to maximize goodput and to minimize power consumption while ensuring feasible algorithm complexity and system scalability.

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Section: Wimax Frame Structurementioning

confidence: 99%

Scheduling in IEEE 802.16e mobile WiMAX networks: key issues and a survey

So-In

Jain

Al-Tamimi

2009

IEEE J. Select. Areas Commun.

290

182

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“…is lower than a constant limit (that describes the total amount of the resource). See for example [28,29] for CDMA systems, [30] for OFDM systems and [31] for WLANs. For service i, the session duration and cell residence rates are μ s i and μ r i respectively.…”

Section: Model Description and Prediction Systemmentioning

confidence: 99%

Robustness of optimal channel reservation using handover prediction in multiservice wireless networks

2012

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, JM.; Pla, V. (2012). Robustness of optimal channel reservation using handover prediction in multiservice wireless networks. Wireless Networks. 18(6):621-633. doi:10.1007/s11276-012-0423-6. Wireless Networks manuscript No.(will be inserted by the editor) Robustness of optimal channel reservation using handover prediction in multiservice wireless networks Jorge Martinez-Bauset · Jose Manuel Gimenez-Guzman · Vicent Pla 2011Abstract The aim of our study is to obtain theoretical limits for the gain that can be expected when using handover prediction and to determine the sensitivity of the system performance against different parameters. We apply an averagereward reinforcement learning (RL) approach based on afterstates to the design of optimal admission control policies in mobile multimedia cellular networks where predictive information related to the occurrence of future handovers is available.We consider a type of predictor that labels active mobile terminals in the cell neighborhood a fixed amount of time before handovers are predicted to occur, which we call the anticipation time. The admission controller exploits this information to reserve resources efficiently. We show that there exists an optimum value for the anticipation time at which the highest performance gain is obtained. Although the optimum anticipation time depends on system parameters, we find that its value changes very little when the system parameters vary within a reasonable range. We also find that, in terms of system performance, deploying prediction is always advantageous when compared to a system without prediction, even when the system parameters are estimated with poor precision.

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“…The IEEE 802.16 standard defines a number of specifications to alleviate the overhead of management messages and to concentrate the transmission power on specific subchannels for battery-powered devices, as follows: (1) the burst must be a continuous bandwidth area, (2) the shapes of the bursts used in downlink and uplink transmissions should be rectangular and multirectangular, respectively, and (3) one burst should use only one MCS based on the worst signal-to-noise ratio (SNR) among the assigned subchannels [1,9].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional downlink burst construction in IEEE 802.16 networks

Lai

Chen

2011

J Wireless Com Network

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Several burst construction algorithms for orthogonal frequency division multiple access were proposed. However, these algorithms did not meet the downlink burst characteristics specified in the IEEE 802.16 standard. This article therefore proposes the best corner-oriented algorithm (BCO). BCO not only complies with downlink burst characteristics, but also considers the three issues to obtain high throughput, as follows: BCO maintains all free slots as a continuous area by constructing each burst in the corner of the available bandwidth area for minimizing external fragmentation; BCO shrinks the burst area to minimize internal fragmentation, if the requested bandwidth has been satisfied; and for exploring the continuous subchannels with good channel quality, BCO ensures that the burst adopts an optimal modulation coding scheme by selecting the excellent corner that can generate the maximal throughput. The simulation results indicate that BCO achieves 2-9 times the throughput achieved by the previous algorithms under a heavy load.

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Two-Dimensional Mapping for Wireless OFDMA Systems

Cited by 129 publications

References 2 publications

Scheduling in IEEE 802.16e mobile WiMAX networks: key issues and a survey

Scheduling in IEEE 802.16e mobile WiMAX networks: key issues and a survey

Robustness of optimal channel reservation using handover prediction in multiservice wireless networks

Two-dimensional downlink burst construction in IEEE 802.16 networks

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