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Network Protocol Trade-off for Strawman Missions

Network Protocol Trade-off for Strawman Missions. Kawsu Sidibeh Surrey Space Centre, University of Surrey, UK ESA Wireless Study WP 1:II. Agenda. Wireless technologies in context WPAN protocol Comparisons WLAN & WMAN protocol Comparisons Recommendations & Conclusions.

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Network Protocol Trade-off for Strawman Missions

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  1. Network Protocol Trade-off for Strawman Missions Kawsu Sidibeh Surrey Space Centre, University of Surrey, UK ESA Wireless Study WP 1:II

  2. Agenda • Wireless technologies in context • WPAN protocol Comparisons • WLAN & WMAN protocol Comparisons • Recommendations & Conclusions

  3. Wireless Standards Date Rates and Deployment

  4. Wireless technologies • By deployment : • Wireless indoors: 802.15.4 (Industrial control and monitoring, Sensor networks, building automation and home control • Wireless Indoors : 802.15.1( Wireless connectivity between devices such as phones, PDA, Laptops, headsets, etc. • Wireless last mile : 802.11, 802.16 (WLAN connectivity, broadband internet access) • Wireless overhaul/Backbone : 802.16 (MAN long range connectivity) • By mobility • Vehicular speeds up to 75 mph : 802.16e • Supplement 802.11p delivers mobility up to 125mph • Vehicular speeds up to 155 mph: mobile-Fi (802.20)

  5. Wireless Protocol Stacks ZigBEE/802.15.4 STACK BLUETOOTH STACK 802.16 STACK 802.11 STACK OSI Model

  6. ZigBee/IEEE 802.15.4 - General Characteristics Dual PHY (2.4GHz and 868/915 MHz)  Optimized for low duty-cycle applications (<0.1%) CSMA-CA channel access Yields high throughput (max 250Kbps) and low latency for low duty cycle devices like sensors and controls Low power (battery life multi-month to years) Multiple topologies: star, peer-to-peer, mesh Optional guaranteed time slot for applications requiring low latency Fully hand-shaked protocol for transfer reliability Bluetooth –General Characteristics PHY ( ISM Band 2.4 GHZ) Optimized for audio, graphic, FTP, ad hoc. Master-Slave Polling channel access 1 Mbps throughput Medium power consumption Max. 7 nodes per picocell Support TCP/IP connections High latency General Comparison ZigBee vs Bluetooth

  7. WPAN Protocol Comparison

  8. 802.11 Widely deployed Up to 54 Mbps on 20 MHz (802.11n supplement up to 300-500 Mbps) Up to 300 meters Qos support (802.11e supplement) Not adaptable to PHY conditions Smart antenna support (802.11n supplement) Weak security (enhanced in 802.11i) Up 100 Mph Mobility ( 802.11p supplement) Power control (Dose) 2.4 GHz and 5 GHz (licensed) 802.16 Experimentally deployed Up to 100 Mbps on 20MHz Up to 50,000 meters QoS support ( Built in the standard) Adaptable to PHY conditions Smart antenna support (both MIMO & AAS) Strong Security (built in the standard) Up to 75 Mph mobility( 802.16e) Space Time Coding (2 TX + 1 Rx) Power control (sleep & awake) 2-60 GHz (licensed & unlicensed) General comparison 802.11 Versus 802.16

  9. WLAN & WMAN Protocol Comparison

  10. Recommendations & Conclusions ZigBee and Bluetooth for Intra-Satellite Links • ZigBee for sensor networking, monitoring, control, etc on-board • Bluetooth for cable replacement. • Possibility of IR-UWB and Wi-Fi for high data rate requirements <1Mbps Wi-Fi and WiMAX for Inter-Satellite Links • Wi-Fi directional or mesh deployments in close proximity links such as satellite clusters and formation flying. • WiMAX deployment to cover last mile (>10 Km) for inter-satellite connectivity in LEO constellations such string of pearls. • Possibility of using ZigBee-Pro (up to 1.6 km) for sensor networking in inter-satellite applications should be considered.

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