Ad Hoc Networks: Introduction

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1 Ad Hoc Networks: Introduction Module A.int.1 Shanghai Jiaotong University Shanghai, China University of New Mexico Albuquerque, NM, USA 1

2 Ad Hoc networks: introduction A.int.1-2 Ad Hoc network overview Ad Hoc network types Sensor networks Mesh networks MANETs Design issues Link layer and MACs Spectrum reuse Routing Crosslayer design End of Module A.int.1

3 Ad-Hoc networks: overview A.int.1-3 Peer-to-peer communications. Virtually fully connected Since media is wireless anyway Quality of link varies a lot! Diagram never can be done accurately

4 Ad Hoc networks: overview A.int.1-4 Characteristics Without using a pre-existing infrastructure Wireless Mobile (partial) Multi-hop Ad hoc deployment Benefits Easy and fast deployment Eliminating dependency on infrastructure

5 A.int.1-5 Ad Hoc networks: overview Applications PAN Personal area networking, connecting with cell phones, laptop, wrist watch, etc Military environments Tanks, soldiers, planes, battlefield communications Emergency operations Rescue, fire fighting Surveillance Civilian environments Town hall meeting Gathering, convention

6 Multi-hop A.int.1-6 From source to destination May need to traverse multiple hops Every node capable of forwarding Require routing algorithms Impacts on MAC Multi-hop aware MAC

7 A.int.1-7 Assumptions and variations Symmetric or asymmetric? All nodes have identical capabilities & responsibilities Or capacity variations in Transmission ranges & bandwidth Battery life Mobility & its speed Processing capacity Or capacity variation in Elected as a leader Routing and forwarding packets Co-exist or co-operate with an infrastructure-based network

8 A.int.1-8 Assumptions and variations Variation with infrastructures Coexistence with an infrastructure if any Variations in traffic characteristics Bit rate Realtime or data oriented Unicast/multicast/geocast Addressing (host, content, capability) Variation in mobility link failure/repair due to mobility may have different characteristics than those due to other causes Rate of link failure/repair may be high when nodes move fast

9 Ad Hoc networks: introduction A.int.1-9 Ad Hoc network overview Ad Hoc network types Sensor networks Mesh networks MANETs Design issues Link layer and MACs Spectrum reuse Routing Crosslayer design End of Module A.int.1

10 Ad hoc special: sensor networks A.int.1-10 Ad hoc sensor networks Node equipped with sensing capability Node are severely power constrained Applications are most likely data driven a large collection of tiny sensor devices Limited resource with sensors Power, processing, storage, communication Deployment in harsh environments Self-organize, self-healing

11 A.int.1-11 Ad hoc special: mesh networks Ad hoc mesh networks Rapidly deployable wireless infrastructure Largely immobile nodes or stationary nodes

12 A.int.1-12 Ad hoc special: MANETs Ad hoc MANET Highly mobile nodes Mobility causes route changes

13 A.int.1-13 Ad hoc special: MANETs IEFT MANET Working Group to standardize an interdomain unicast routing protocol which provides one or more modes of operation, each mode specialized for efficient operation in a given mobile networking context, where a context is a predefined set of network characteristics.

14 Ad Hoc networks: introduction A.int.1-14 Ad Hoc network overview Ad Hoc network types Sensor networks Mesh networks MANETs Design issues Link layer and MACs Spectrum reuse Routing Crosslayer design End of Module A.int.1

15 Design issues A.int.1-15 Link layer design Channel access and frequency reuse Reliability Routing Network issues Power/energy management

16 Link layer design A.int.1-16 Modulation and Coding Robustness Rate requirements Performance Adaptive techniques: rate, power, BER, code, framing, etc. Power control Multiuser Detection Antenna design Smart antennas and MIMO.

17 MAC design A.int.1-17 Nodes need a decentralized channel access method Minimize packet collisions while increasing channel utilization Collisions course significant delay Aloha w/ CSMA/CD have hidden/exposed terminals Exposed Terminal Hidden Terminal uses four-way handshake Creates inefficiencies, especially in multihop setting

18 Design issues A.int.1-18 Scalability issues Tradeoff energy consumption vs. latency Standard issues protocol deployment and incompatibility standards Security issues

19 Spectrum reuse A.int.1-19 Static channel allocation, multiple channels Poor connectivity i C1 R g k f p j h e m c d b R C2 a

20 Spectrum reuse A.int.1-20 Static channel allocation, single channel Poor interference i C1 R g k f p j h e m c d b R C2 a

21 Spectrum reuse A.int.1-21 Dynamic channel allocation, single interface Good Connectivity and Controlled Interference i C1 R g p k j h e f m c d b R C2 a

22 Spectrum reuse A.int.1-22 Dynamic channel allocation, mulitple interfaces Complicated control i C1 R g p k j h e f m c d b R C2 a

23 Ad hoc routing A.int.1-23 AD-HOC MOBILE ROUTING PROTOCOLS TABLE DRIVEN/ PROACTIVE ON-DEMAND-DRIVEN REACTIVE DSDV CGSR HYBRID ZRP DSR AODV

24 Ad hoc routing A.int.1-24 Flooding, broadcast-based Inefficient Robust for fast changing topologies. Little explicit overhead Point-to-point routing Routes follow a sequence of links Connection-oriented Explicit end-to-end connection Less overhead/less randomness Hard to maintain under rapid dynamics. Connectionless Packets forwarded towards destination Local adaptation

25 Ad hoc routing A.int.1-25 Table-driven Destination-sequenced distance-vector Clusterhead gateway switch routing Wireless routing protocol On-Demand Routing On-demand distance vector routing Dynamic source routing Temporally ordered routing Associativity-based routing Signal stability routing

26 Ad hoc routing A.int.1-26 Proactive Routing Protocol: continuously evaluate the routes attempt to maintain consistent, up-to-date routing information when a route is needed, one may be ready immediately when the network topology changes the protocol responds by propagating updates throughout the network to maintain a consistent view Reactive Routing Protocol: on-demand Ex: DSR, AODV

27 Ad hoc route dissemination A.int.1-27 Route computed at centralized node Most efficient route computation. Can t adapt to fast topology changes. BW required to collect and disseminate information Distributed route computation Nodes send connectivity information to local nodes. Nodes determine routes based on this local information. Adapts locally but not globally. Nodes exchange local routing tables Node determines next hop based on some metric. Deals well with connectivity dynamics. Routing loops common.

28 Reliability A.int.1-28 Packet acknowledgements needed May be lost on reverse link Need negative ACKs? Combined ARQ and coding Retransmissions cause delay Coding may reduce data rate Hop-by-hop acknowledgements Explicit ACKs Echo ACKs Transmitter listens for forwarded packet More likely to experience collisions than a short ACK. Hop-by-hop or end-to-end or both.

29 Crosslayer design A.int.1-29 Application Network Access Link/MAC Hardware Delay Constraints Rate Requirements Energy Constraints Mobility Optimize and adapt across design layers Provide robustness to uncertainty

30 Crosslayer design? A.int.1-30 The technical challenges of future mobile networks cannot be met with a layered design approach. QoS cannot be provided unless it is supported across all layers of the network. The application must adapt to the underlying channel and network characteristics. The network and link must be application aware Interactions across network layers must be understood and exploited.

31 Summary A.int.1-31 Ad-hoc networks provide a flexible network infrastructure for many emerging applications Advances in communication techniques should be incorporated into ad-hoc network design Design issues traverse all layers of the protocol stack, and cross layer designs are needed Protocol design in one layer can have unexpected interactions with protocols at other layers. Many new issues to be addressed

32 Ad Hoc networks: introduction A.int.1-32 Ad Hoc network overview Ad Hoc network types Sensor networks Mesh networks MANETs Design issues Link layer and MACs Spectrum reuse Routing Crosslayer design End of Module A.int.1

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