Fast Interference-Aware Scheduling of Multiple Wireless Chargers
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1 Fast Interference-Aware Scheduling of Multiple Wireless Chargers Zhi Ma*, Jie Wu, Sheng Zhang*, and Sanglu Lu* *State Key Lab. for Novel Software Technology, Nanjing University, CN Center for Network Computing, Temple University, USA 2018/10/11 1
2 Outline Background and contributions Model and problem formulation Algorithm design Performance evaluation Conclusion 2018/10/11 2
3 Background Wireless Sensor Network Sensors are powered by small batteries; Long-distance charging Low efficiency Ways to improve Increase chargers power à harmful Use multiple chargers 2018/10/11 3
4 Background Combined energy Combined energy is additive? Difference between two charging models 4
5 Background Related work: Calculate the charging energy in advance àcomplexity grows exponentially with the number of chargers Discovery: Strong and weak areas 2018/10/11 5
6 Contributions We apply a new charging model with nonlinear super-position into the FCS problem ànp-comlete; We propose FastPick algorithm in 1D line à bound (2-Є); We propose RoundPick algorithm in 2D network à bound; 2018/10/11 6
7 Models Network model N stationary sensor nodes {! ",! $,,! & } and M chargers {' ", ' $,, ' ( } Charging model frequency component ) *, amplitude + *, initial phase, *, power attenuation factor 2 Radio signal received by sensor from charger ' - Radio signal received by sensor!. from charger set C 2018/10/11 7
8 Models Charging model Power received by sensor! " from charger set C where # = & ' ( ), & ' = * +,, 2018/10/11 8
9 Models Harvesting model! Energy capacity: E 2018/10/11 9
10 Problem Formulation We use! " to denote # $% charging schedule! & = 1,0,1,0 ; denotes charging duration. Problem: Given a set C of chargers with fixed position, a set S of rechargeable sensors, a set {- ". 1 i N, 1 j M} of distance between ci and sj, and an energy capacity E of each sensor, FCS is to find a set of multiple charging schedules {! /,! &,,! 1 }, to charge each sensor with energy no less than E, and k is minimized. 2018/10/11 10
11 One-Dimension Line Rational Assumption: all frequency are the same; Observation: difference of phases between two chargers 2018/10/11 11
12 One-Dimension Line FastPick (Initial phases are adjustable) Choose the sensor with the least energy; Find two chargers that are closest to this sensor; Adjust their initial phases to make most sensors lie in their strong areas; Adjust other chargers initial phases to make the strong and weak areas are the same; Reverse the original weak and strong areas. 2018/10/11 12
13 One-Dimension Line Approximation Ratio Lower bound: T (All chargers strengthen each other); FastPick is at most 2 times longer than T; T is smaller than OPT; FastPick is 2-! approximate. 2018/10/11 13
14 Two-Dimension plane Challenges Irregular; Two directions; Cannot coincide. 2018/10/11 14
15 Two-Dimension Plane Partition Every sensor in one slot should be covered by chargers in this slot; There is at least one charger in a slot; The length of slot side should be minimized, but no less than 2 R (R is the charging radius). 2018/10/11 15
16 RoundPick Partition the network; In each iteration, algorithm first computes each two chargers strong areas in each slot, then chooses a sensor with the least energy; Add new chargers if more energy would be received; Move slot. We also get a bound of 6-4! 2018/10/11 16
17 Settings Wave length:λ=0.33m, threshold of harvesting energy is 15uW, transition efficiency is 0.25, charging duration 20s; Distance threshold 6.78m, (0.25 4/(4π*d)2 = 0.015mW); Default number of charger 12, sensor 50, energy capacity 4mJ. 2018/10/11 17
18 2018/10/11 18
19 & 2018/10/11 19
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