Standy/PowerON S d /P ON - PDF document

The Last Issue The Last Issue e e ast ssue ast ssue � Power Consumption Issues 無線網路多媒體系統 無線網路多媒體系統 • Standy/PowerON S d /P ON • Processing Power Consumption Wireless Multimedia System y • Transmitting Power Consumption • Routing Power Consumptions Dr. Eric Wu Dr. Eric Wu Lecture 12 Lecture Lecture 12 Power Lecture 12 Power Power Issues ower Issues Issues & Energy Issues & Energy Energy Efficient nergy Efficient Efficient fficient http://wmlab.csie.ncu.edu.tw/course/wms Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Reading list for This Lecture Reading list for This Lecture ead ead g g st o st o s s ectu e ectu e Power Power- -Sensitive Network Architectures Sensitive Network Architectures � Required Reading (August 2001 Communication Magazine) in Wireless Communications in Wireless Communications in Wireless Communications in Wireless Communications • [Bambus98] Bambus, “Power Sensitive Architecture in Wireless Network, Concepts, Issues and Design Aspects, IEEE Personal Communications Magazine, 1998 • [Jones2001] C. E. Jones, K. M. Stvalingam, P. Agrawal, J. C. Chen, “A Survey of Energy Efficient Network Protocols for Wireless Networks”, Journal of Wireless Networks 2001 • [Gomez2001]J. Gomez, A.T. Campbell, M. Naghshineh, C. Bisdikian, “Conserving Transmission Power in Wireless Ad Hoc Networks” • [Chen2001]B. Chen, K. Jamieson, H. Balakrishnan, R. Morris, “Span: An Energy-Efficient Coordination Algorithm for Topology Maintenance in Ad Hoc Wireless Network” Concepts, Issues, and Design Aspects Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Agenda Agenda ge da ge da Power Control Concept and Its Practical Power Control Concept and Its Practical � Sensitive Power Control Wireless Network Significance Significance Significance Significance � Energy Efficient Network Protocols for Wireless Network Hi h Higher Bandwidth (150 Mega) B d idth (150 M ) Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory

QoS depends on Transmitter Power Control QoS depends on Transmitter Power Control Related Issues Related Issues e ated ssues e ated ssues (PC) (PC) (PC) (PC) � System Point of View • Transmitter power minimization, network capacity maximization, optimal resource allocation � Individual Connection Point of View Individual Connection Point of View • Online link QoS monitoring • Adaptation to changes due to mobility and channel impairments Adjust the power WLAN Feedback Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Basic Requirements for PC dynamics Basic Requirements for PC dynamics as c as c equ e equ e e ts o e ts o C dy a C dy a cs cs Research Background in PC Research Background in PC esea c esea c ac g ou d ac g ou d C C � Distributed � Packet Radio (’80) • Allowing autonomous execution at the node or link level • Point to Point Wireless Communication � Simple • Packet-Switch datagram Traffic • Dynamically allocate slits/codes to various communication links • Dynamically allocate slits/codes to various communication links • Suitable for real time implementation S it bl f l ti i l t ti • Power Control in packet radio was mainly used for adjusting the � Agile transmission range to reach various receivers • For fast tracking of channel changes and adaptation For fast tracking of channel changes and adaptation � Cellular Networks (’90) � Robust • PC is used for improving spatial channel reuse and increasing network • To gracefully adapt to diverse stressful contingencies g y p g capacity p y � Scalable • SIR (Signal-to-interference ratios): lowering them while congested • Satisfy a required SIR threshold using the least possible power • To maintain high performance at various network scales of interest Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Three Fundamental goals Three Fundamental goals ee ee u da u da e ta goa s e ta goa s Adaptive Power Control Adaptive Power Control dapt dapt e e o e Co t o o e Co t o � To Minimize Power Consumption � The Wireless Network as a Collection of Power-Controlled Interfering and Prolog Battery Life of Mobile and Prolog Battery Life of Mobile links li k Nodes � Distributed Power Control: The concept of Active Link Protection � To mitigate interference and � A t � Autonomous Online Admission Control: The Voluntary/Forced O li Ad i i C t l Th V l t /F d increase network capacity Dropped Concept � To maintain link QoS by adapting to � Quick Noninvasive Channel Proving and Monitoring: The Probing node movements and channel Quick Noninvasive Channel Proving and Monitoring: The Probing impairments Concept � Autonomously probe: admission � A t l b d i i control, channel selection, switching, handoff Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory

Associated Research Issues Associated Research Issues ssoc ated ssoc ated esea c esea c ssues ssues � Online Adaptation of DPC/ALP to Congestion � The Multi-channel Case: Channel Selection and Switching A Survey of Energy Efficient A Survey of Energy Efficient Network Network � The Minimum-Power Routing Problem in Multi-hop Wireless Protocols for Wireless Networks Protocols for Wireless Networks Networking N t ki � Node Mobility, Network Stretching and Reconfiguration, and Probing- Based Handoffs Based Handoffs � The Stochastic Basis for Power Control and Quick Online Estimation of Link Quality � The Power Manager’s Dilemma: To Transmit or Wait? � Error-Driven Power Management Wireless Network 2001 � Power-Sensitive Wireless Network Architectures? Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Abstract Abstract bst act bst act Introduction Introduction t oduct o t oduct o � As wireless networks become an integral component of the modern � Wireless devices have maximum utility when they can be used communication infrastructure, energy efficiency will be an important i ti i f t t ffi i ill b i t t “anywhere at anytime”. One of the greatest limitations to that goal, “ h t ti ” O f th t t li it ti t th t l design consideration due to the limited battery life of mobile terminals. however, is finite power supplies. � This paper presents a comprehensive summary of recent work � Studies show that the significant consumers of power in a typical addressing energy efficient and low-power design within all layers of laptop are the microprocessor (CPU), liquid crystal display (LCD), the wireless network protocol stack. hard disk, system memory (DRAM), keyboard/mouse, CDROM drive, floppy drive, I/O subsystem, and the wireless network interface card Application [ [55,62]. ] OS, MiddleWare Energy Efficient Energy Efficient RTP, TCP, UDP RSVP IP, Mobile IP � A typical example from a Toshiba 410 CDT mobile computer yp p p Wireless Network Layer Wireless Network Layer demonstrates that nearly 36% of power consumed is by the Low-power Clustering(optional) Data Link display,21% by the CPU/ memory, 18% by the wireless interface, and MAC 18% by the hard drive. 18% by the hard drive. Radio Radio Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory Introduction(cont.) Introduction(cont.) t oduct o (co t ) t oduct o (co t ) Background Background ac g ou d ac g ou d � Consequently, energy conservation � Infrastructure wireless network architecture: has been largely considered in the has been largely considered in the • Wireless networks often extend, hardware design of the mobile rather than replace, wired networks terminal [10] and in components • A hierarchy of wide area and y such as CPU,disks, displays, etc. such as CPU disks displays etc local area wired networks is used as the backbone network . � Significant additional power • BS are responsible for coordinating g p access to one or more transmission savings may result by incorporating channel(s) for mobiles located within low-power strategies into the the coverage cell. design of network protocols used • Transmission channels may be FDMA , for data communication. TDMA ,CDMA Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory ™ Wireless & Multimedia Network Laboratory Wireless & Multimedia Network Laboratory