Radio resource allocation in fixed broadband wireless networks

Fong, T.K.; Henry, P.; Leung, Kin K.; Qiu, Xianyang; Shankaranarayanan, N.K.

doi:10.1109/26.681421

Cited by 39 publications

(32 citation statements)

References 12 publications

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“…Most of the previous research on resource management for wireless networks has focused on systems in which all of the nodes may cooperate with one another, typically in an infrastructured environment [7]. By contrast, the scenario considered in this paper consists of two subsystems: a non-cooperative system consisting of the set of primary users and a cooperative system consisting of the set of FAR nodes.…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Leu¹,

McHenry²,

Mark³

2006

Int J Network Mgmt

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SUMMARYSpectrum measurement studies have shown that substantial portions of the allocated wireless spectrum are highly underutilized. Frequency-agile radios (FARs) have the potential to make opportunistic use of such spectrum holes without causing harmful interference to users of the allocated spectrum. Toward this goal, we develop a framework for modeling the interference caused by FARs employing spectrum access mechanisms based on the simple ListenBefore-Talk (LBT) scheme. Two variations of LBT are considered: individual LBT, whereby the FARs act independently of each other; and collaborative LBT, whereby the FARs communicate with each other in order to more accurately identify the spectrum holes. Our analysis of the LBT scheme reveals the fundamental interdependencies among key system design metrics and provides a basis for analyzing more complex spectrum access methods. In particular, the analysis of LBT provides a lower bound on the capacity gain achievable by FARs employing spectrum-sharing schemes. Our numerical results show that the individual LBT scheme can provide substantial capacity gains, while even more gain can be achieved using the collaborative LBT schemes. Our analysis suggests that much greater gains should be achievable via spectrum access schemes that incorporate location information and/or more sophisticated group behaviors.

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Section: Introductionmentioning

confidence: 99%

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Leu¹,

McHenry²,

Mark³

2006

Int J Network Mgmt

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“…[BFZA96] and the SRA method [FHLQS98]. The high ESRA throughput translates into a very large network capacity.…”

Section: Introductionmentioning

confidence: 99%

“…As for the uplink, using full power control, the throughput can reach 16.7% per sector with a packet loss probability of less than 5 x 10 − 4 . The ESRA performance is compared favorably to existing methods such as the CPDA scheme[BFZA96] and the SRA method [FHLQS98]. The high ESRA throughput translates into a very large network capacity.…”

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confidence: 99%

Dynamic allocation of downlink and uplink resource for broadband services in fixed wireless networks

Leung

Srivastava²

1999

IEEE J. Select. Areas Commun.

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We propose and analyze a resource allocation algorithm, referred to as the Enhanced Staggered Resource Allocation (ESRA) method, for downlink and uplink in fixed broadband wireless networks with directional antennas at base stations and terminals. The new method is based on the Staggered Resource Allocation (SRA) algorithm proposed in [FHLQS98] with consideration of reception quality at terminal locations [QC97]. Terminals are categorized into multiple classes, depending on their ability to tolerate concurrent packet transmissions. The bandwidth is divided into mini-frames allowing different degrees of concurrent transmissions, thus packets of different classes are sent in the corresponding mini-frames. The purpose of the ESRA method is to maximize concurrent transmissions up to an extent tolerable by the receiving terminals for throughput improvement, while avoiding major co-channel interference in the networks where the same frequency band is re-used in every sector of every cell.For reasonable radio environment, practical antenna patterns and choices of system parameters, our performance analysis shows that the ESRA method provides 98.69% coverage, and yields a maximum downlink throughput of 36.10% per sector with success probability of one for packet transmission in terms of meeting a 15dB threshold for signal-to-interference ratio (SIR). As for the uplink, using full power control, the throughput can reach 16.7% per sector with a packet loss probability of less than 5 x 10 − 4 . The ESRA performance is compared favorably to existing methods such as the CPDA scheme[BFZA96] and the SRA method [FHLQS98]. The high ESRA throughput translates into a very large network capacity. In addition to data services, the high quality of service reveals the applicability of the new method to support real-time traffic such as voice and video. Therefore, we believe that the new approach represents an important step forward in providing broadband, multi-media services in fixed wireless networks.-2 -

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“…Intra-cell channel reuse is suboptimal and is usually based on static cell sectorization [25] or beam switching methods, which do not fully capture user mobility, channel dynamics and traffic load variations. Related research on beamforming has mostly focused on beam adaptation for a single channel in order to ensure acceptable SINR at each receiver.…”

Section: Introductionmentioning

confidence: 99%

The impact of space division multiplexing on resource allocation: a unified approach

Koutsopoulos

Ren

Tassiulas

IEEE INFOCOM 2003. Twenty-Second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37

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Abstract-Recent advances in the area of wireless communications have revealed the emerging need for efficient wireless access in personal, local and wide area networks. Space division multiple access (SDMA) with smart antennas at the base station is recognized as a promising means of increasing system capacity and supporting rate-demanding services. However, the existence of SDMA at the physical layer raises significant issues at higher layers. In this paper, we attempt to capture the impact of SDMA on channel allocation at the media access control (MAC) layer. This impact obtains different forms in TDMA, CDMA and OFDMA access schemes, due to the different cochannel and inter-channel interference instances, as well as the different effect of corresponding channels (time slots, codes or subcarrier frequencies) on user channel characteristics. We follow a unified approach for these multiple access schemes and propose heuristic algorithms to allocate channels to users and adjust down-link beamforming vectors and transmission powers, with the objective to increase achievable system rate and provide QoS to users in the form of minimum rate guarantees. We consider the class of greedy algorithms, based on criteria such as minimum induced or received interference and minimum signal-to-interference ratio (SIR), as well as the class of SIR balancing algorithms. Our results indicate that this cross-layer approach yields significant performance benefits and that SIR balancing algorithms achieves the best performance.

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Radio resource allocation in fixed broadband wireless networks

Cited by 39 publications

References 12 publications

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Modeling and analysis of interference in Listen‐Before‐Talk spectrum access schemes

Dynamic allocation of downlink and uplink resource for broadband services in fixed wireless networks

The impact of space division multiplexing on resource allocation: a unified approach

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