Burst Construction and Packet Mapping Scheme for OFDMA Downlinks in IEEE 802.16 Systems

Ohseki, Takeo; Morita, Masaki; Inoue, Takashi

doi:10.1109/glocom.2007.819

Cited by 67 publications

(52 citation statements)

References 2 publications

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“…The goal of the algorithm proposed in [10] is to reduce the number of bursts by grouping data for different users but with the same MCS. This is done by allocating bursts of fixed height, called buckets.…”

Section: Related Workmentioning

confidence: 99%

OFDMA Downlink Burst Allocation Mechanism for IEEE 802.16e Networks

del-Castillo¹,

Delicado²,

Villalón³

2011

Networking 2011

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Abstract. Orthogonal Frequency Division Multiple Access (OFDMA) is one of the most promising, demanded and researched modulation and access methods for future mobile wireless networks. Emerging technologies, like Worldwide Interoperability for Microwave Access (WiMAX) or Long Term Evolution (LTE), are adopting OFDMA due to its high spectral efficiency, scalability for high amounts of users and mobility support. In OFDMA, before data is actually transmitted, it must be mapped into a time-frequency matrix through a resource allocation process. This step is critical for a correct network behaviour, and several factors must be taken into account like efficiency, Quality of Service (QoS) fulfillment or power consumption. In this paper, we propose a novel approach for the mapping process of IEEE 802.16e networks, and we compare its performance with several existing algorithms. The effectiveness of our proposal is evaluated in different scenarios by means of extensive simulation.

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Section: Related Workmentioning

confidence: 99%

OFDMA Downlink Burst Allocation Mechanism for IEEE 802.16e Networks

del-Castillo¹,

Delicado²,

Villalón³

2011

Networking 2011

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“…These two types of wasted slots are called over-allocation and unused slots, respectively. We present simulation results comparing an algorithm called "eOCSA" that we have developed with that proposed by Takeo Ohseki at el [10]. The comparison is limited to these two algorithms for various reasons.…”

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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“…However, the traditional studies in operational research are not applicable for the burst construction because they focus on packing objects with fixed shapes and values [13][14][15]. Thus, a number of algorithms were proposed [10,11,[16][17][18][19][20][21]. The eOCSA algorithm proposed by So-In et al [10] constructs the first burst in the bottom right-hand corner of the available bandwidth area, and subsequently constructs another burst if the available bandwidth area above the previous burst is sufficient.…”

Section: Related Studiesmentioning

confidence: 99%

“…Otherwise, eOCSA subsequently constructs the burst on the left-hand edge of the previous burst. The approaches [16][17][18] were designed in a method similar to eOCSA, but with minor modifications. Cicconetti et al [19] further evaluated the internal fragmentation of the burst constructed in different directions, that is, vertical direction or horizontal direction, and subsequently selected the direction that experienced less fragmentation to construct the burst.…”

Section: Related Studiesmentioning

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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Burst Construction and Packet Mapping Scheme for OFDMA Downlinks in IEEE 802.16 Systems

Cited by 67 publications

References 2 publications

OFDMA Downlink Burst Allocation Mechanism for IEEE 802.16e Networks

OFDMA Downlink Burst Allocation Mechanism for IEEE 802.16e Networks

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

Two-dimensional downlink burst construction in IEEE 802.16 networks

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