Adaptation techniques in wireless packet data services

Nanda, Sanjiv; Balachandran, K.; Kumar, S.

doi:10.1109/35.815453

Cited by 289 publications

(168 citation statements)

References 7 publications

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“…The third-generation (3G) technologies are a first step in this direction. Nanda et al [13] provide a fairly comprehensive overview of the 3G technologies and how they have been designed with multimedia-type services in mind. In all proposals it is possible for connections to not only choose from a variety of data rates but also change the data rate in a flexible and quick fashion.…”

Section: Introductionmentioning

confidence: 99%

<title>Class and channel condition-based scheduler for EDGE/GPRS</title>

Agrawal

Bedekar

et al. 2001

SPIE Proceedings

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The efficient management of the radio resource of a 3-G system is important from an operator's perspective. This, however, cannot be the only concern when quality of service (QoS) negotiations have been made for various users and the operator has to uphold these. This leads to a fairness objective that the operator has to keep in mind. In this paper we outline a scheme to perform packet-level scheduling and resource allocation at the wireless node that takes into account the notions of both efficiency and fairness and presents a means to explore the trade-off between these two notions. As a part of this scheme we see the scheduling problem as deciding not just the packet transmission schedule but also the power allocation, the modulation and coding scheme allocation and the spreading code determination since the latter three directly influence the radio resources consumed. Using a utility maximization formulation based on the data-rates that the mobiles can transmit at, we decide on the weights for a weighted proportionally fair allocation based scheduling algorithm. We also show how one can adapt the weights and the algorithm for a time-varying channel. We conclude with a simulation based performance analysis for infinitelybacklogged sources and TCP sources on an EDGE system.

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Section: Introductionmentioning

confidence: 99%

<title>Class and channel condition-based scheduler for EDGE/GPRS</title>

Agrawal

Bedekar

et al. 2001

SPIE Proceedings

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“…There are a few different methods of link adaptation traditionally recognized. Adaptive Power Application (APA) is the method in which the transmitted power is adjusted [3,28]. Adaptive Coding and/or Modulation (ACM) is the approach in which the transmitted modulation and/or coding schemes are altered [5,6,29].…”

Section: Prior Workmentioning

confidence: 99%

Link adaptation for mitigating Earth-to-Space propagation effects on the NASA SCaN testbed

Kilcoyne

Rowe

Headley

et al. 2016

2016 IEEE Aerospace Conference

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In Earth-to-Space communications, well-known propagation effects such as path loss and atmospheric loss can lead to fluctuations in the strength of the communications link between a satellite and its ground station. Additionally, a less-often considered effect of shadowing due to the geometry of the satellite and its solar panels can also lead to link degradation. As a result of these anticipated channel impairments, NASA communication links have been traditionally designed to handle the worst-case impact of these effects through high link margins and static, lower rate, modulation formats. This thesis first characterizes the propagation environment experienced by a software-defined radio on the NASA SCaN Testbed through a full link-budget analysis. Then, the following chapters propose, design, and model a link adaptation algorithm to provide an improved trade-off between data rate and link margin through varying the modulation format as the received signal-to-noise operate at the most robust transmitting configuration, ensuring a low error-rate. However, with this worst-case method, the trade-off manifests in the very constrained data rate-although the data is transmitted with minimal errors, the throughput also remains low. This thesis first outlines the propagation environment experienced by a communications signal originating in Cleveland, OH and traveling to a software-defined radio on the NASA SCaN Testbed. Then, a link adaptation algorithm is designed and simulated to provide an improved trade-off between data rate and bit error rate. This flexibility between transmitting configurations allows for communications to be more efficient, as the transmitter can adapt as the signal strength improves.

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“…Lastly, burst-by-burst adaptive transceivers [27]- [29] are capable of adapting to the short-term time-variant channel quality fluctuations of wireless channels expressed in terms of the BER or transmission burst error rate, irrespective of whether their source was the time-variant co-channel and/or intersymbol interference, slow and/or fast fading, etc. The range of already operational adaptive transceivers was reviewed in the excellent contribution by Nanda et al [75].…”

Section: Cellular Channel Capacity Without Power Controlmentioning

confidence: 99%

Interactive cellular and cordless video telephony: State-of-the-art system design principles and expected performance

2000

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Second-generation (2G) mobile radio standards have not been designed with video communications in mind, although the employment of error-resilient, constant-bit-rate proprietary video codecs over these systems is realistic. The third-generation (3G) systems I. STATE-OF-THE-ART SYSTEM COMPONENT DEVELOPMENTS A. Introduction and OutlineThe subject of mobile radio communications has reached a state of maturity over the past two decades, as indicated by the excellent monographs by Jakes This contribution attempts to summarize a range of recent advances in the field of bandwidth-efficient wireless video communications. In this section, we commence our discourse with a brief overview of the wireless scene and, in particular, by considering the video transmission capabilities of the existing and future wireless systems. The geographical variation of the cellular channel capacity is characterized by Section II, as a motivation for invoking burst-by-burst adaptive transceivers [27]- [29]. The nature of co-channel interference (CCI)-which is the most dominant channel impairment in wireless systems-is the topic of Section III, where it is shown that the geographic variation of CCI justifies the employment of multimode transceivers, which are discussed in Section IV. Low-rate video compression aspects are reviewed in Section V, and the performance of the ITU H.263 codec is analyzed in some depth. Our discussions in Sections VI and VII are focused on the performance of reconfigurable video transceivers. Specifically, in Section VI, no power control is used-which is typically the case in cordless telephones, such as DECT and CT2-while in Section VII, power control is employed, which is characteristic of cellular systems, such as GSM [30], etc. Section VIII proposes a near-instantaneously adaptive or burst-by-burst adaptive code-division multiple-access (CDMA) scheme, which can be invoked in the context of the forthcoming 3G systems, in order to enhance their performance. Lastly, our discussions are concluded in Section IX with a range of system design guidelines. Let us now commence our overview of the range of existing and forthcoming wireless systems and their video transmission capabilities. B. Second-Generation (2G) Wireless SystemsThe existing 2G wireless systems now constitute a mature technology. Although they have not been designed with video communications in mind, with the advent of the specially designed error-resilient, fixed-rate video codecs [27]-[35] proposed by Streit et al., it is nonetheless realistic to provide videophone services over these low-rate schemes. For low-latency interactive videophony these systems have

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Adaptation techniques in wireless packet data services

Cited by 289 publications

References 7 publications

<title>Class and channel condition-based scheduler for EDGE/GPRS</title>

<title>Class and channel condition-based scheduler for EDGE/GPRS</title>

Link adaptation for mitigating Earth-to-Space propagation effects on the NASA SCaN testbed

Interactive cellular and cordless video telephony: State-of-the-art system design principles and expected performance

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