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A Dynamic Query-tree Energy Balancing Protocol for Sensor Networks H. Yang, F. Ye, and B. Sikdar Department of Electrical, Computer and systems Engineering.

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Presentation on theme: "A Dynamic Query-tree Energy Balancing Protocol for Sensor Networks H. Yang, F. Ye, and B. Sikdar Department of Electrical, Computer and systems Engineering."— Presentation transcript:

1 A Dynamic Query-tree Energy Balancing Protocol for Sensor Networks H. Yang, F. Ye, and B. Sikdar Department of Electrical, Computer and systems Engineering IEEE WCNC 2004 Speaker: Hao-Chun Sun

2 Outline Introduction Energy Consumption Model Dynamic Query-tree Energy Balancing Algorithm (DQEB) Simulation Results Conclusion

3 Introduction -background- Sensor network Use Querying to collect information across the whole sensor network. A set of sensors is specifically asked to report information of interest. Query Sink Sensor network

4 Introduction -background- Basic Sensor Network Query Procedure flooding

5 Introduction -background- Sensor network characteristics Limited power Lower processing ability Limited bandwidth Smaller memory

6 Introduction -background- Optimal Sensor Network Query Procedure Broadcast Tree Protocols Minimum energy broadcast tree problem is NP-complete. Many approximate algorithms is proposed.

7 Introduction -motivation- These protocols are useful only for the development of static trees. These protocols are un-weighted protocols whose assumptions are valid only when the nodes are first deployed. Query Broadcast Tree Non-leaf Nodes Leaf Nodes Sink

8 Introduction -motivation- Focus on Developing techniques to improve the querying procedure to minimize energy consumption and maximize the sensor network lifetime. Distributed the broadcast load evenly on nodes so that the energy distribution is balanced. DQEB update the query tree structure to avoid uneven energy depletion.

9 Energy Consumption Model Sensor network query tree Sink Non-leaf nodes Leaf nodes Query Broadcast Tree Non-leaf Nodes (Receive, Forward) Non-leaf Nodes (Receive, Forward) Leaf Nodes (Receive) Leaf Nodes (Receive) Sink

10 Energy Consumption Model -weight- Every node is associated with a weight. ω : [0, 1], nodes weight is initialized to 0., β is the power attenuation factor and determines the rate at which depleting power affects the weight of a node. P is its remaining battery lifetime. Desire to increase the weight faster as the remaining battery becomes lower.

11 Energy Consumption Model -energy cost- The energy cost of broadcast depends on the number of leaf and non-leaf nodes in query tree as well as the amount of remaining batter power at a node., Tx power= λ× Rx power (γ)  Minimum

12 Dynamic Query-tree Energy Balancing Algorithm (DQEB) Assumptions A cluster structure Only involves the cluster heads Nodes have uniform hardware, software and battery capacity. Nodes are energy-aware. A query tree is assumed to exist with the sink node as the root and all nodes in the network being either leaf or non-leaf nodes of the tree.

13 Dynamic Query-tree Energy Balancing Algorithm (DQEB) Overview UC triggers DQEB algorithm. Neighborhood Information Synchronization (NIS) algorithm Designated parents (DP) selection from alternative parents (AP) 9(0.1) 1(0.1) 7(0.3) 8(0.3) 2(0.3) 3(0.5) 4(0.2)6(0.4) 5(0.6) Update Coordinator (UC)

14 Dynamic Query-tree Energy Balancing Algorithm (DQEB) Neighborhood Information Synchronization Algorithm Neighborhood Information Table (NIT) State information of neighbors  ID, route to root, state,…. Periodic “Hello” message to detect node failure. If a node’s state information changes in the interval between hello messages, the hello message is substituted by the changed information.

15 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Set-Covering problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) K={ } C={3,4,5,7} A={2,3,4,6,8,9} K={ } C={3,4,5,7} A={2,3,4,6,8,9} (w5/d5)

16 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Set-Covering problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

17 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Set-Covering problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

18 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Set-Covering problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

19 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Set-Covering problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5) DP={9,8,6,3}

20 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Set-Covering problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5) DP={9,8,6,3}

21 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

22 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5) DP={9,6,3}

23 Dynamic Query-tree Energy Balancing Algorithm (DQEB) Differentiating APs Sibling AP Offspring AP Independent AP i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w8/d8) (w5/d5) Sibling AP Offspring AP Independent AP

24 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) K={ } C={3,4,5,7} A={2,3,4,6,8,9} K={ } C={3,4,5,7} A={2,3,4,6,8,9} (w5/d5) C={3,4,5,6,7} A={2,8,9} C={3,4,5,6,7} A={2,8,9}

25 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) K={ } C={3,4,5,6,7} A={2,8,9} K={ } C={3,4,5,6,7} A={2,8,9} (w5/d5)

26 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

27 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

28 Dynamic Query-tree Energy Balancing Algorithm (DQEB) A Greedy algorithm for parent selection Disconnected Problem i 5 4 3 14 7 6 8 15 1 9 10 11 12 2 13 C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} C={3,4,5,7} A= A1={2,4,9} A2={3,4} A3={6} A4={6,8} (w9/d9) (w2/d2) (w3/d3) (w4/d4) (w6/d6) (w7/d7) (w8/d8) (w5/d5)

29 Dynamic Query-tree Energy Balancing Algorithm (DQEB) Resolving Update Conflicts Two nodes trigger DQEB concurrently. Lock mechanism Once the UC triggers all its children for their APs’ information, all children will freeze themselves. Any UC that does not get a response from some of its children waits for a given time.

30 Simulation Results Network Size: 600 m x 600 m Nodes number: 1000 Nodes positions: Uniformly distributed Network is connected and Query tree has been constructed initially. λ=3 β=3, w=(1-P) β

31 Simulation Results Power Distribution Balance v.s Time

32 Simulation Results Life Time v.s Death Rate threshold

33 Simulation Results Power STD v.s Connectivity

34 Simulation Results Life Time v.s Connectivity

35 Conclusion We proposed an energy aware, distributed protocol to dynamically update query tree structures in sensor network. Decisions are taken at each non-leaf node to locally minimize the cost of the broadcast tree by switching a non-leaf node with low remaining power to a leaf node so that its energy depletion rate is decreased.

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