base station deployment and resource allocation in sustainable wireless networks 1 zhongming zheng,...
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Base Station Deployment and Resource Allocation in Sustainable Wireless Networks
1Zhongming Zheng, 1Shibo He, 2Lin X. Cai, and 1Xuemin (Sherman) Shen
1Department of Electrical and Computer Engineering
University of Waterloo2School of Engineering and Applied Science
Princeton University
HANDBOOK ON GREEN INFORMATION AND COMMUNICATION SYSTEMS
Chapter 16
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2
• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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Introduction
• Energy Sources
– Renewable Energy
• Repeatedly replenished
• Examples: wind, solar
– Non-renewable Energy:
• Once depleted, no more available
• Examples: coal, natural gas
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Introduction
• Green Wireless Communication Networks– WLAN mesh network structure
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• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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Literature Review
• Device Design– PV systems
• [1] Probabilistic methods
• [2] Simulation model
– Energy charging and discharging models• [3] Battery/energy buffer
• [4] Power consumption model of BSs
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[1] H. A. M. Maghraby, M. H. Shwehdi, and G. K. Al-Bassam, “Probabilistic assessment of photovoltaic (pv) generation systems,” Power Systems, IEEE Transactions on, vol. 17, no. 1, pp. 205–208, Feb. 2002.[2] E. Lorenzo and L. Navarte, “On the usefulness of stand-alone pv sizing methods,” Progress in Photovoltaics: Research and Applications, vol. 8, no. 4, pp. 391–409, Aug. 2000.[3] L. X. Cai, Y. Liu, H. T. Luan, X. Shen, J. W. Mark, and H. V. Poor, “Adaptive resource management in sustainable energy powered wireless mesh networks,” in IEEE Globecom, Houston, TX, USA, Dec. 5-9 2011, pp. 1–5.[4] O. Arnold, F. Richter, G. Fettweis, and O. Blume, “Power consumption modeling of different base station types in heterogeneous cellular networks,” in Future Network & Mobile Summit, Florence, IT, Jun. 16-18 2010, pp. 1–8.
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Literature Review
• Minimal Device Deployment– Continuous Case
• Direct search
• [5] Quasi-Newton methods
– Discrete Case• [6] Sustainability
• [7] Outage free
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[5] G. L. Z. Wei and L. Qi, “New quasi-newton methods for unconstrained optimization problems,” Applied Mathematics and Computation, vol. 175, no. 2, pp. 1156–1188, Apr. 2006.[6] Z. Zheng, L. X. Cai, M. Dong, X. Shen, and H. V. Poor, “Constrained energyaware ap placement with rate adaptation in wlan mesh networks,” in IEEE GLOBECOM, Houston, TX, USA, Dec. 5-9 2011, pp. 1–5. [7] S. A. Shariatmadari, A. A. Sayegh, and T. D. Todd, “Energy aware basestation placement in solar powered sensor networks,” in IEEE WCNC, Sydney, AUS, Apr. 18-21 2010, pp. 1–6.
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Literature Review
• Resource Allocation– Scheme Design
• [8] Traffic scheduling
• [9] Admission control and routing
• [10] Power control
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[8] A. A. Hammad, G. H. Badawy, T. D. Todd, A. A. Sayegh, and D. Zhao, “Traffic scheduling for energy sustainable vehicular infrastructure,” in IEEE GLOBECOM, Miami, FL, USA, Dec. 6-10 2010, pp. 1–6.[9] L. Lin, N. B. Shroff, and R. Srikant, “Asymptotically optimal energy-aware routing for multihop wireless networks with renewable energy sources,” Networking, IEEE/ACM Transactions on, vol. 15, no. 5, pp. 1021–1034, Oct. 2007.[10] A. Farbod and T. D. Todd, “Resource allocation and outage control for solarpowered wlan mesh networks,” Mobile Computing, IEEE Transactions on, vol. 6, no. 8, pp. 960–970, Aug. 2007.
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• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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System Model
• Given a set of BSs, users and candidate locations
• All users are associated with a BS
• BSs are powered by renewable energy
• BSs and users may have different power levels of charging and transmission
• In a WLAN, BS and its associated users use the same transmission power
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System Model
• No inter-WLAN interference with orthogonal channels assigned to BSs for inter-WLAN communication
• BSs can only be placed at a given set of candidate locations
• BSs at different candidate locations have different charging capabilities
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• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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Problem Formulation
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The number of deployed BSs
Full coverage & Each user is associated with only one BS
Achieved throughput ≥ Traffic demandHarvested energy ≥ Consumed energy
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Problem Formulation
• Initialization:
• Output:
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Problem Formulation
• Problem Analysis
– Minimal BS placement problem with power allocation
– NP-hard problem• Sub-problems are NP-hard
– Optimal placement of BSs with a fixed power
– Power allocation of BSs
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Problem Formulation
• Algorithm Design Strategy
– NP-hard → No solution in polynomial time– Design an effective heuristic algorithm
• Achieve good performance
• Reduce the time complexity
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• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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TCGBP Algorithm
• First Phase
– Partition the whole network region into several VPs (Voronoi Polygons)
– Place one BS in each candidate location– Connect users to the BS in the same VP region
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TCGBP Algorithm
• First Phase
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TCGBP Algorithm
• Second Phase
– Connect BSs and users in neighboring VP regions until constraints can not be held
– Return the result when all users are connected
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TCGBP Algorithm
• Second Phase
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TCGBP Algorithm
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Phase II
Phase I
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TCGBP Algorithm
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• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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Numerical Results
• Simulation Configurations
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Parameter Value
WLAN mesh networks 100 m × 100 m
Transmission power levels 10 dBm, 15 dBm, 20 dBm
Charging capability [20, 30] mW per slot
Time duration 1000 slots
Channel bandwidth 40 MHz
Path loss exponent 4
Background noise -20 dBm
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Numerical Results
Different numbers of users and traffic demands
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Numerical Results
Different numbers of candidate locations and charging capabilities
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• Introduction
• Literature Review
• System Model
• Problem Formulation
• TCGBP Algorithm
• Numerical Results
• Conclusion & Future Work
Outline
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Conclusion
• Green energy sources
• Formulate an optimal green BS placement problem
• Propose TCGBP algorithm
– Approach the optimal solution with significantly reduced time complexity
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Future Work
• Study the impacts of dynamics in the energy charging and discharging process
• Analyze the network capacity bounds under different deployment strategies
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