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Speaker : Yu-Ping Chen Advisor : Quincy Wu Date : 2010/01/17
Low Power Wi-Fi Speaker : Yu-Ping Chen Advisor : Quincy Wu Date : 2010/01/17
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Outline Introduction to Wi-Fi and IEEE 802.11
Introduction to Low Power Wi-Fi Product of Low Power Wi-Fi Comparison between Wi-Fi and Zigbee Reference
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Introduction to Wi-Fi Wi-Fi technology builds on IEEE standards. The term Wi-Fi suggests Wireless Fidelity. Wi-Fi is a trademark of the Wi-Fi Alliance. Wi-Fi Alliance was established in 1999, when the name was called the Wireless Ethernet Compatibility Alliance (WECA). In 2002, officially changed its name to Wi-Fi Alliance.
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Introduction to Wi-Fi (cont.)
A huge installed base of over 2 billion Wi-Fi-certified devices. --Wi-Fi direct will make Wi-Fi even more pervasive by turning devices/equipment into soft AP There are about 300 members from a vibrant standard and industry alliance. Well-proven encryption, authentication and end-to-end network security. Mature network management systems.
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Comparison with 802.11 802.11 Protocol Freq. (GHz)
Data rate per stream (Mbps) Max Distance (indoor) Max Distance (outdoor) Original 2.4 1-2 15m 40m 802.11a 5 6-54 30m 45m 802.11b (Wi-Fi) 5.5-11 100m 802.11g 802.11n 2.4 or 5 50m 300m The table refers to Wiki.
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Introduction to Low Power Wi-Fi
High level of integration -- shorten connections, minimize capacitances and inductances and reduce overall energy consumption. Flexible and rapid power management -- fast-response states with reduced power consumption -- very-low-power Standby or Idle states
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Introduction Low Power Wi-Fi (cont.)
Transition from low-power states to a fully operational condition in a short time -- pre-arranged schedule or by external input. Minimal current drain for connection maintenance and device management
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Typical Low-Power Wi-Fi Operation
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Low Power Wi-Fi = Standard Wi-Fi, IP
Wi-Fi sensors use IP-over-Ethernet networking environment . Sensor nodes can be managed and configured remotely using SNMP . Support of well proven Wi-Fi link-layer encryption and authentication and related Wi-Fi Protected Access (WPA/ WPA2).
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Low Power Wi-Fi = Standard Wi-Fi, IP (cont.)
A low-power Wi-Fi device can use the NAV value received to reduce power consumption during the requested interval, and avoid attempting a transmission which is likely to collide with that of another Station.
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Application to Low Power Wi-Fi
Healthcare Industrial Building Automation "Smart Grid" Utilities Residential Transportation Consumer Electronics Remote Control Products
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Products of Low Power Wi-Fi
Broadcom BCM4326 Broadcom BCM4328 Atech iWEM-1000 Redpine Signals RS9110-N-11-31 GainSpan S1010
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Products of Low Power Wi-Fi (cont.)
GainSpan GS1010 Highly-integrated Wi-Fi SoC – Dual processors, SRAM, Flash, PA in 10mm * 10mm.
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Products of Low Power Wi-Fi (cont.)
Ultra low power consumption for years of battery life on a single AA. Works with existing Wi-Fi AP infrastructure. Supports TCP/IP/UDP protocol for direct internet connectivity. Enables management, setup and configuration of device (SNMP). Delivers Enterprise-level security and reliability
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Products of Low Power Wi-Fi (cont.)
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Products of Low Power Wi-Fi (cont.)
Smart power consumption for battery powered sensors Efficient active and standby modes System level power management Small footprint, real-time OS Controlled clocking, wakeup Single die integration
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Comparison between Wi-Fi and Zigbee
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Comparison between Wi-Fi and Zigbee (cont.)
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Reference http://en.wikipedia.org/wiki/Wi-Fi
wifi.html market-growth-forecast-for-low-power- wifi-in-wireless-sensor-networks.html
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Footprint :這個術語用來描述微型元件 在電腦中佔用更少的空間,以及軟體在 記憶體中(無論隨機存取記憶體或唯讀 記憶體)佔用更少的空間。
Real-time 作業系統是針對 2 種主要類 型的應用所研發:事件回應 (Event Response) 與閉迴路控制系統。事件回 應應用,需要一定時間內針對激發所產 生的回應。 back
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