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Classification of Component s and Approaches of Ad hoc Routing Protocols. Myung Lee & Tarek Saadawi CCNY October 22 nd , 2004. Component-Based Routing. Core components Components possessed by most routing protocols . Auxiliary components
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Classification of Components and Approaches of Ad hoc Routing Protocols Myung Lee & Tarek Saadawi CCNY October 22nd, 2004
Component-Based Routing • Core components • Components possessed by most routing protocols. • Auxiliary components • Additional components that are not essential to all routing protocols CCNY
Core Components • Route discovery • Route selection • Route formation /representation • Data forwarding • Route maintenance • Routing metrics CCNY
Auxiliary Components • Neighbor discovery and maintenance • Hierarchical structure • Multicast • Security CCNY
Core Components CCNY
(1) Route Discovery • Finding potential route(s) to a destination • Reactive • Proactive • Hybrid CCNY
Route Discovery (cont.) • Reactive • Full-flooding RREQ (AODV) • Limited-Flooding RREQ (LAR) • Position based • Direction based • Region based • Expanding ring • A priori knowledge • Efficient broadcast • Probabilistic RREQ (ANT, GPS Any-like) • Hybrid CCNY
Route Discovery (cont.) • Proactive • Broadcastingcost-to-all to neighbors (DSDV) • Update message (cost-to-all) stops at neighbors, each node periodically updates its neighbors • Broadcastingcost-to-neighbor to all (LSR) • Update message (cost-to-neighbor) floods to the network CCNY
Route Discovery (cont.) • Proactive (cont.) • Broadcastingcost-to-neighbor to neighbors • Update message (cost-to-neighbor) stops at neighbors, each node periodically (constant period) updates its neighbors (GSR, TRR) • Update message (cost-to-neighbor) stops at neighbors, each node periodically (different period based on distance to update originator) updates its neighbors (FSR, DREAM) • Unicast cost-to-all to a neighbor • Update message (cost-to-all) stops at a neighbor, each neighbor periodically updates one of its neighbors (Angle SINR Table Routing) CCNY
Route Discovery (cont.) • Hybrid: Examples • Proactive for intra-cluster, reactive for inter-cluster (ZRP) • Proactive for virtual backbone, reactive for end-devices (TTDD) • Distance vector for neighborhood, self-routing for distant nodes (Terminode routing) CCNY
(2) Route Selection • Selecting the best route(s) to a destination from the potential routes. • Reactive • Proactive • Hybrid CCNY
Route Selection (cont.) • Reactive • Sourcebehavior • Select one or more routes from multiple RREPs (AODV, AOMDV) • Select the first arrived RREP and discard later RREPs (AODVjr) • Accept all RREPs (AOMDV) • Destination behavior • Select from multiple RREQs and reply with one/more RREP(s) (AODV) • Select from multiple RREQs and reply with one RREP (delayed RREP) (LBR) • Reply to all RREQs (AODVM: all; AOMDV: up to k RREPs) CCNY
Route Selection (cont.) • Reactive (cont.) • Intermediate node behavior • Creating one or multiple routing entries based on RREQ filtering metric • RREQ filtering • Filtering duplicated RREQs (AODV) • Relaying RREQs without filtering • Filtering RREQs based on the interface the RREQ came from (SMR for link disjoint multipath) • Filtering RREQs based on cost (ABR) • Filtering RREQs based on whether they are in the forwarding zone (LAR, Region-based routing). • Filtering RREQs based on traffic flow conditions (LBR) CCNY
Route Selection (cont.) • Proactive • Optimization based on distance vector (DSDV) • Optimization based on link state (OLSR, FSR, ZHLS) • Calculation based on tree topology (nerRFon) • Calculation based on position information (GPSR, GREEDY) • Hybrid (ZRP: Proactive for intra-cluster, reactive for inter-cluster) CCNY
(3) Route Formation/ Representation • Means to store routing information. • Exact route • Route guidance CCNY
Route Formation/Representation (cont.) • Exact route • Routing table (AODV) • Interest entry(DD) • Route in the packet (DSR) • Binary tree (tree routing) CCNY
Route Formation/Representation (cont.) • Route guidance • Cost table (GRAd) • Geographical information • Exact positions (GPSR) • Pointer (TERMINODE) • Approximate region (ZHLS, LABAR) • Hierarchical structure information • Cluster headers (CBRP) • Cores (CEDAR) • Landmarks (LANMAR) CCNY
(4) Route Maintenance • Proper update/ repair of routes to addressnetwork dynamics • Route refreshing • Failure handling • Route invalidation CCNY
Route Maintenance (cont.) • Route refreshing • Reactive • Control packet (GPS Ant-like) • Data packet (AODV) • Automatic update when predefined or estimated route lifetime expires (LBR, LUNAR) • Hybrid (AODVjr) CCNY
Route Maintenance (cont.) • Route refreshing (cont.) • Proactive • Distance vector update (DSDV) • Link state update (LSR) • Location information update (DREAM) • Hierarchical structure update (ZHLS) • Hybrid (ZRP: Proactive for intra-cluster, reactive for inter-cluster ) CCNY
Route Maintenance (cont.) • Failure handling • Reactive • Rediscovery (AODV, DSR, DREAM) • Local repair (AODV, LAR) • Alternative path(multipath like TORA) • Route cache (DSR) • Data cache(CHAMP) • Proactive (handled by the route refreshing process) • Hybrid (GRA) CCNY
(5) Data Forwarding • Means to forward data packets based on route information • Unicast • Data broadcast + neighbor filtering (GRAd) • Flooding CCNY
Data Forwarding (cont.) • Unicast • Routing table • Deterministic • One route • Multiple routes * Simultaneously * Alternatively • Probabilistic CCNY
Data Forwarding (cont.) • Unicast (cont.) • Self-routing (without routing table) • Tree routing • Location-based routing • Send to the neighbor in the transmission range that is closest to destination node (Greedy) • Send to the neighbor cluster that is closest to destination node (LABAR) • Hybrid of above approaches (Terminode, GRA) CCNY
(6) Routing Metrics • Parameters used by routing algorithms to determine route optimality • Hop • Connectivity • Link QoS • Route QoS CCNY
Routing Metrics (cont.) • Route QoS • E2E delay/Jitter • Reliability • Throughput • Security • Energy • Node lifetime • Network lifetime • Processing power (CPU, memory) • Etc. CCNY
Auxiliary Components CCNY
Auxiliary Components • Neighbor discovery and maintenance • Hierarchical structure • Multicast • Security CCNY
(1) Neighbor Discovery and Maintenance • Dynamic maintenance of neighborhood information such as location, direction, ID, resources etc. • Synchronous approach • Asynchronous approach CCNY
Neighbor Discovery and Maintenance(cont.) • Synchronous approach • Beacon/Hello • 1-hop neighbor information • 2-hop neighbor information (OLSR, GLS, TERMINODE) • Asynchronous approach • Control packet (LBR, AODV) • Data packet (AODV) CCNY
(2) Hierarchical Structure • Organizing a group of network nodes into one or multiple level architecture. • Flat • Hierarchical • Homogeneous (proactive or reactive) • Heterogeneous (proactive and reactive) (ZRP) CCNY
(3) Multicast • The transmission of a packet from a sender to a group of receivers • Tree based • Source tree • Shared tree • Mesh based • Broadcast • Multiple unicasts CCNY
(4) Security • Means to achieve secure communication (confidentiality, integrity, freshness, and authentication) CCNY
Next Step • Analyses of Approaches • Derivation of Dependency Graph of Approaches • Component Researches • Multipath • Route discovery • Efficient broadcasting CCNY
CBR Reference List Papers reviewed: 90 By X. Hu, H. Juan, C. Zhu, Y. Liu, J. Zheng, J. Yoon
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[Survey 3] Dragos Niculescu “Positioning in Ad Hoc Sensor Networks” IEEE Network, July/August 2004 • [Survey 4] Elizabeth M. Royer and Chai-Keong Toh “A Review of Current Routing Protocols for Ad Hoc Mobile Wireless Networks” IEEE Personal Communications, April 1999 CCNY
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