1. 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

2. 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

3. 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.

4. 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.

5. 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.

6. 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

7. 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

8. Typical Low-Power Wi-Fi Operation

9. 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).

10. 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.

11. Application to Low Power Wi-Fi
Healthcare 
Industrial 
Building Automation 
"Smart Grid" Utilities 
Residential 
Transportation 
Consumer Electronics Remote Control Products 

12. Products of Low Power Wi-Fi
Broadcom BCM4326
Broadcom BCM4328
Atech iWEM-1000
Redpine Signals RS9110-N-11-31
GainSpan S1010

13. Products of Low Power Wi-Fi (cont.)
GainSpan GS1010
Highly-integrated Wi-Fi SoC – Dual processors, SRAM, Flash, PA in 10mm * 10mm.

14. 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

15. Products of Low Power Wi-Fi (cont.)

16. 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

17. Comparison between Wi-Fi and Zigbee

18. Comparison between Wi-Fi and Zigbee (cont.)

19. Reference http://en.wikipedia.org/wiki/Wi-Fi
wifi.html
market-growth-forecast-for-low-power- wifi-in-wireless-sensor-networks.html

20. 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。
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