Advances in wireless terminals

Lettieri, P.; Srivastava, Mani

doi:10.1109/98.752784

Cited by 52 publications

(26 citation statements)

References 23 publications

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“…Even while current devices have the ability to communicate and process data, they are and by large primarily either data processing devices or communication devices. Simply shrinking the processing devices and communication devices, and packaging them together does not alleviate the architectural bottlenecks of integrated mobile multimedia devices [9]. The real challenge is to design a device where data processing and communication share equal importance.…”

Section: System Architecturementioning

confidence: 99%

“…It would further be desirable for a wireless terminal to have architectural reconfigurability whereby its capabilities may be modified by downloading new functions from network servers. Such reconfigurability would also help in field upgrading as new communication protocols or standards are deployed, and in implementing bug fixes [9]. One of the key issues in the design of portable multimedia systems is to find a good balance between flexibility and high-processing power on one side, and area and energy-efficiency of the implementation on the other side.…”

Section: System Architecturementioning

confidence: 99%

“…Minimising energy consumption is a task that will require minimising the contributions of communication and computation, making the appropriate trade-offs between the two [9]. For example, reducing the amount of transmitted data may be beneficial.…”

Section: Contributionsmentioning

confidence: 99%

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Lessons Learned from the Design of a Mobile Multimedia System in the MOBY DICK Project

Gerard¹,

Paul²

2000

Handheld and Ubiquitous Computing

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1 Personal mobile computingIn recent years, technology drivers changed significantly. High-end systems used to direct the evolution of computer architectures and systems. Now low-end systems drive technology, due to their large volume and attainable profits. Advances in technology enable portable computers to be equipped with wireless interfaces, allowing networked communication even while on the move. Whereas today's notebook computers and personal digital assistants (PDAs) are self contained, tomorrow's networked mobile computers are part of a greater computing infrastructure.Two trends -multimedia applications and mobile computing -will lead to a new application domain and market in the near future. Personal mobile computing (often also referred to as ubiquitous computing [17]) will play a significant role in driving technology in the next decade. In this paradigm, the basic personal computing and communication device will be an integrated, battery-operated device, small enough to carry along all the time. This device will be used as a replacement of many items the modern human-being carries around. It will incorporate various functions like a pager, cellular phone, laptop computer, diary, digital camera, video game, calculator and remote control. An important issue will be the user interface: the interaction with its owner. The device will support multimedia tasks like speech recognition, video and audio.Wireless networking greatly enhances the usability of a personal computing device. It provides mobile users with versatile communication, and permits continuous access to services and resources of the landbased network. A wireless infrastructure capable of supporting packet data and multimedia services in addition to voice will bootstrap on the success of the Internet, and in turn drive novel networked applications and services.However, the technological challenges to establishing this paradigm of personal mobile computing are non-trivial. In particular, these devices have limited battery resources, will handle diverse data types, and will operate in environments that are insecure, unplanned, and show different characteristics in time.Five years ago, in 1995, we started the MOBY DICK project, whose main focus was on the design of such a novel and versatile machine [12]. The MOBY DICK project started as a joint European project (Esprit Long Term Research 20422) to develop and define the architecture of a new generation of mobile handheld computers. The design challenges have been primarily in the creation of a single architecture that allows the integration of security functions (e.g. payment), externally offered services (e.g. airline ticket reservation), personality (i.e. these devices know what their owners want), and communication (mobile internet terminal). After one year, the research themes focussed on: systems architecture of

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Section: System Architecturementioning

confidence: 99%

Section: System Architecturementioning

confidence: 99%

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Lessons Learned from the Design of a Mobile Multimedia System in the MOBY DICK Project

Gerard¹,

Paul²

2000

Handheld and Ubiquitous Computing

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“…With high-speed wireless networks, many different architectural choices become possible, each with different partitioning of functions between the hand-held and the servers resident in the network. Partitioning is an important architectural decision, which dictates where applications can run, where data can be stored, the complexity of the mobile and the cost of communication services [9].…”

Section: System Decompositionmentioning

confidence: 99%

Chameleon — Reconfigurability in Hand-Held Multimedia Computers

Smit¹,

Bos²,

Havinga³

et al. 1999

Handheld and Ubiquitous Computing

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Abstract. This paper discusses reconfigurability issues in low-power hand-held multimedia systems, with particular emphasis on energy conservation. We claim that a radical new approach has to be taken in order to fulfill the requirements -in terms of processing power and energy consumption -of future mobile applications. A reconfigurable systems-architecture in combination with a QoS driven operating system is introduced that can deal with the inherent dynamics of a mobile system. We present the preliminary results of studies we have done on reconfiguration in hand-held mobile computers: by having reconfigurable media streams, by using reconfigurable processing modules and by migrating functions.

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“…However, unlike other areas of computer technology such as microchip design, battery technology has not experienced significant (compared to Moore's Law) advancement in the past 30 years. Therefore, unless a breakthrough occurs in battery technology, a goal of research should be to decrease the energy consumed in the wireless terminal [5].In terms of energy consumption, the wireless exchange of data between nodes strongly dominates other node functions such as sensing and processing [6] [7]. Moreover, actual radios consume power not only when sending and receiving data, but also when listening.…”

mentioning

confidence: 99%

Analysis of Energy Conservation in Sensor Networks

et al. 2005

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In this paper we use the Erlang theory to quantitatively analyse the trade offs between energy conservation and quality of service in an ad-hoc wireless sensor network. Nodes can be either sleeping, where no transmission or reception can occur, or awake where traffic is processed. Increasing the proportion of time spent in the sleeping state will decrease throughput and increase packet loss and delivery delay. However there is a complex relationship between sleeping time and energy consumption. Increasing the sleeping time does not always lead to an increase in the energy saved. We identify the energy consumption profile for various levels of sensor network activity and derive an optimum energy saving curve that provides a basis for the design of extended-life ad hoc wireless sensor networks.Keywords: Sensor networks, Ad hoc networks, Energy efficient design, QoS, Erlang formula IntroductionRecent advances in micro-electro-mechanical systems (MEMS) technology, wireless communications and digital electronics have enabled the development of low-cost, low-power, multifunctional smart sensor nodes [1]. Smart sensor nodes are autonomous devices equipped with heavily integrated sensing, processing, and wireless communication capabilities [2][3]. When these nodes are networked together in an ad-hoc fashion, they form a sensor network. The nodes gather data via their sensors, process it locally or coordinate amongst neighbors and forward the information to the user or, in general, a data sink. Due to the node's limited transmission range, this forwarding mostly involves using multi-hop paths through other nodes [3]. A node in the network has essentially two different tasks: (1) sensing its environment and processing the information for onward transmission, and (2) forwarding traffic from other sensors as an intermediate relay in the multi-hop path.The major design challenge for this type of network is to increase the operational lifetime of the sensors as much as possible [1][4]. Indeed, sensor nodes are miniature devices and operate on a tiny, non-replaceable battery. Energy efficiency is therefore the critical design constraint. Research can address two different perspectives of the energy problem: (1) an increase in battery capacity and (2) a decrease in the amount of energy consumed at the wireless terminal. The focus of battery technology research has been to increase battery power capacity while restricting the weight of the battery. However, unlike other areas of computer technology such as microchip design, battery technology has not experienced significant (compared to Moore's Law) advancement in the past 30 years. Therefore, unless a breakthrough occurs in battery technology, a goal of research should be to decrease the energy consumed in the wireless terminal [5].In terms of energy consumption, the wireless exchange of data between nodes strongly dominates other node functions such as sensing and processing [6] [7]. Moreover, actual radios consume power not only when sending and receiving data, but al...

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Advances in wireless terminals

Cited by 52 publications

References 23 publications

Lessons Learned from the Design of a Mobile Multimedia System in the MOBY DICK Project

Lessons Learned from the Design of a Mobile Multimedia System in the MOBY DICK Project

Chameleon — Reconfigurability in Hand-Held Multimedia Computers

Analysis of Energy Conservation in Sensor Networks

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