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Network Optimization

Network Optimization. Lecture 15 - 3. Topology Control (TC). TC & Energy Conservation TC & Network Capacity Definition of TC Taxonomy of TC TC & Routing TC & MAC. Definition of TC (1/2). Topology control

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Network Optimization

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  1. Network Optimization Lecture 15 - 3

  2. Topology Control (TC) • TC & Energy Conservation • TC & Network Capacity • Definition of TC • Taxonomy of TC • TC & Routing • TC & MAC

  3. Definition of TC (1/2) • Topology control • the art of coordinating nodes’ decisions regarding their transmitting ranges (powers), in order to generate a network with the desired properties (e.g.connectivity) while reducing node energy consumption and/or increasing network capacity • Distinguishing Features • Setting transmission ranges/power levels • Network-wide perspective

  4. Definition of TC (2/2) • Counterexamples • Energy-efficient design of the wireless transceiver • Node-wide vs. Network-wide perspectives • Optimize transmit power level for a single wireless transmission, possibly multi-hop • Channel-wide vs. Network-wide perspectives • Clustering nodes into multiple levels • Fixed vs. Modifiable transmission ranges

  5. Taxonomy of TC (1/4) • Homogeneous TC • Use the same transmitting range r, known as the critical transmitting range (CTR) • Determine the minimum value of r such that a certain network-wide property is satisfied • Simplest TC problem  deriving clean theoretical results is a challenging but feasible task

  6. Taxonomy of TC (2/4) • Non-homogeneous TC • Allowed to choose different transmitting ranges • Location based • Most accurate information • Assume nodes are equipped with GPS • Range assignment • Centralized • Optimal • Energy-efficient communication • Distributed • Almost optimal

  7. Taxonomy of TC (3/4) • Direction based • Assume nodes can estimate the relative direction of their neighbors • Neighbor based • Minimal amount of information (e.g. ID, distance, order) • Most suitable for mobile ad hoc networks

  8. Per-packet TC More energy efficient Frequent power changing Periodical TC Less energy efficient Rare power changing Taxonomy of TC (4/4)

  9. TC in Protocol Stack

  10. with TC trigger route update trigger TC execution TC & Routing without TC

  11. TC & MAC discover new neighbor nodes

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