Scheduling and power adaptation for networks in the ultra wide band regime

Negi, Rohit; Rajeswaran, A.

doi:10.1109/glocom.2004.1377928

Cited by 25 publications

(22 citation statements)

References 14 publications

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“…For a UWB wireless network, if a link is scheduled to transmit in consecutive packet slots, the re-acquisition overhead for the packet slots following the first one can be avoided 3 . This means that it is desirable to let a link transmit continuously in terms of acquisition overhead reduction.…”

Section: E Adaptation To Long Acquisition Timementioning

confidence: 99%

“…For multi-channel multiple access, in the limit of infinite bandwidth (W → ∞), the optimal MAC scheme is to simply allow transmissions over all the links simultaneously, because interference becomes negligible [2]. However, for a practical UWB network, the bandwidth is large but finite, so that uncontrolled simultaneous transmissions are not optimal [3], [4]. Hence, it is critical to determine when, where, and how to allow simultaneous transmissions, and how to alleviate the induced interference in order to achieve desired performance.…”

Section: Introductionmentioning

confidence: 99%

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Effective packet scheduling with fairness adaptation in ultra-wideband wireless networks

Jiang

Zhuang²

2007

IEEE Trans. Wireless Commun.

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Abstract-Ultra-wideband (UWB) transmission is an emerging wireless technology, and medium access control (MAC) with quality of service (QoS) provisioning is essential to coordinate the access among competing devices in UWB-based wireless networks. In this paper, we study the exclusive region concept (which was previously proposed) to determine the active set of senders at a time. We find out that, different from the previous work, the exclusive region for a specific link should be a systemlevel concept, and should depend on system factors such as interference from/to other active links. Based on the findings, two MAC packet scheduling schemes are proposed to exploit the system capacity and, at the same time, to achieve a certain level of fairness in UWB wireless networks. As the long acquisition time in UWB transmission can significantly reduce the system efficiency, the proposed schemes can be modified to alleviate the negative effect of a long acquisition time. Computer simulations demonstrate the effectiveness and efficiency of our proposed schemes.Index Terms-Ultra-wideband (UWB) transmission, medium access control (MAC), packet scheduling, quality of service (QoS), transmission power and rate, fairness.

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Section: E Adaptation To Long Acquisition Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effective packet scheduling with fairness adaptation in ultra-wideband wireless networks

Jiang

Zhuang²

2007

IEEE Trans. Wireless Commun.

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“…In many wireless networks, such as the wideband code division multiple access (WCDMA) [10] and ultrawideband (UWB) networks [11], [12], multiple parallel channels are available and thus a parallel multiuser scheduling design is required. In [10], in order to maximize the sum throughput, the scheduling for each time slot requires to solve a multi-dimensional nonlinear optimization problem for optimal power allocation, multi-code assignment, and adaptive modulation.…”

Section: Introductionmentioning

confidence: 99%

QRP07-4: Generalized Selection Multiuser Scheduling with Channel Estimation Errors

Zhang

2006

IEEE Globecom 2006

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We propose and study a generalized selection multiuser scheduling (GSMuS) scheme which ranks a total of L users awaiting transmission by their signal-to-noiseratios (SNRs) and selects Nc users with the largest SNRs for parallel channel access. We derive the error and outage probabilities, the individual and sum rates of the proposed GSMuS scheme with adaptive modulation. The effect of imperfect channel estimation (ICE) on the sum and individual rates is analytically evaluated. Numerical results show that as the average channel SNR (ASNR) per user increases, assigning more users for parallel transmission (for a fixed total transmission power) will significantly improve the sum throughput than scheduling one best user. Under the block static fading assumption, as the ASNR increases the effect of ICE on the spectral efficiency tends to decrease, and the performance of GSMuS with ICE approaches that with perfect channel state information (CSI).

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“…Several techniques have been reported in the literature about the design of optimization rules and the design of sub-optimal algorithms [4,17,19] for scheduling [2,4,16,18] and power control. For instance, the technique suggested in [4] focuses on the scheduling process when a new user gets access and considers the fairness for getting access in UWB ad-hoc networks.…”

mentioning

confidence: 99%

“…One of the findings, which is in accordance with the results reported in [4], is that a node should transmit at peak power or keep silent to achieve the maximum throughput in a UWB network which contains only NRT nodes. In [17], max-min fairness scheduling and power control problems are jointly addressed by a dual approach. Unfortunately, the scenarios considered in all these previous researches are homogeneous-purely RT or purely NRT.…”

mentioning

confidence: 99%

High performance power control and opportunistic fair scheduling in TH-PPM UWB ad-hoc multimedia networks

2007

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Ultra wideband (UWB) systems are currently an important wireless infrastructure for high performance short-range communications and mobile applications. Indeed, forming ad-hoc networks among various UWB enabled devices is considered as an important mobile data exchange operating environment. In our study, we explore the problem of jointly optimizing the power level and data rate used in the devices in such a UWB based ad-hoc network. We propose a practical optimization algorithm based on judicious power control for real-time applications and opportunistic scheduling for non-real-time applications. Simulation results indicate that our proposed techniques are effective under various practical scenarios.

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Scheduling and power adaptation for networks in the ultra wide band regime

Cited by 25 publications

References 14 publications

Effective packet scheduling with fairness adaptation in ultra-wideband wireless networks

Effective packet scheduling with fairness adaptation in ultra-wideband wireless networks

QRP07-4: Generalized Selection Multiuser Scheduling with Channel Estimation Errors

High performance power control and opportunistic fair scheduling in TH-PPM UWB ad-hoc multimedia networks

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