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Ad hoc Network

Ad hoc Network. 江崎研究室　修士１年 中島　亮. What is Ad hoc Network?. Meaning of Ad hoc Network Ad hoc ＝その場限りの Node to node → ノード間で一時的に形成されるネットワーク. Use of Ad hoc Network. Sensor network IC chip Weather sensor Sensor for scout Mobile network Cellular phone Note PC PDA

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Ad hoc Network

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  1. Ad hoc Network 江崎研究室　修士１年 中島　亮

  2. What is Ad hoc Network? • Meaning of Ad hoc Network • Ad hoc＝その場限りの • Node to node →ノード間で一時的に形成されるネットワーク

  3. Use of Ad hoc Network • Sensor network • IC chip • Weather sensor • Sensor for scout • Mobile network • Cellular phone • Note PC • PDA →movable and weak computationand battery power

  4. Packet transferring • Multi-hop between nodes • Efficient packet routing →need to find efficient route

  5. Multi-hop transferring • Getting routing information • Pro-active • Making routing table beforehand • Smaller lookup delay but more communication Ex.OLSR, TBRPF • Re-active • Look up route when needed • Bigger delay but fewer communication Ex.DSR, AODV

  6. OLSR • Optimized Link State Routing • Hello message • One hop to all neighbor nodes • Never forward (IP TTL=1) • Message: own and neighbor’s address

  7. Feature of OLSR • MPR( Multi-Point Relay ) • Smallest set of 1 hop nodes that can join all 2 hop neighbor nodes • Efficient flooding Pink object in right picture is MPR

  8. Getting topology • TC( topology control ) message • All nodes selected as MPR MUST send • Contain links between MPR and the node which select the node as MPR • Broadcast to all nodes • Each nodes calculate topology and route from this TC message and HELLO message

  9. DSR • Dynamic Source Routing • Route discovery • Efficient flooding by sequence number • Relay node cache route information too Request Reply

  10. Feature of DSR • Route is written in Packet • No loop can occur • Confirm connection: use wireless ack Source Node Destination Node

  11. AODV • Ad hoc On-demand Distance Vector • Re-active but partly pro-active • Search route when needed • Same as DSR • Each node cache route from forwarding packet • Can use the same Hello Message as OLSR use • To confirm links to neighbors are alive

  12. Feature of AODV • Distance Vector (DV) • Routing table • Destination node’s address • Hop number to Destination node • Next node to Destination node • Smaller packet • Route is not in the packet • Smaller routing table • Each node know only next hop node Distance Vector

  13. Conclusion • Outline of ad hoc network • Behavior of OLSR, DSR, AODV • Advantages and Disadvantages • OLSR:smaller delay,bigger communication • Have way to lessen communication • DSR:bigger delay,smaller communication • Have way to lessen delay →Choose protocol as the situation demands

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