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Adaptation of TDMA Parameters Based on Network Conditions

Adaptation of TDMA Parameters Based on Network Conditions. Bora KARAOGLU. Agenda. PHY Layer Abstraction Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters. Agenda. PHY Layer Abstraction Protocol Overview

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Adaptation of TDMA Parameters Based on Network Conditions

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  1. Adaptation of TDMA Parameters Based onNetwork Conditions Bora KARAOGLU

  2. Agenda PHY Layer Abstraction Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters

  3. Agenda PHY Layer Abstraction Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters

  4. PHY Layer Abstraction • BW • Each tx occupies some part of the BW • Transmissions should overcome any noise present in the space of the BW • Divide • Spatial reuse

  5. PHY Layer Abstraction • TDMA: • Divide BW along time axis • Clustering: • Distribute parts of BW spatially among clusters

  6. Agenda PHY Layer Abstraction Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters

  7. Protocol Overview • TDMA • Soft Clustering • CHs responsible for channel access only • Inter cluster communication is allowed

  8. Agenda PHY Layer Abstraction Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters

  9. Analytical Analysis • Shortcomings of Simulations • Substantial Processing Power and Time • Repetitions for statistical accuracy • Valid only for the parameters set used • Scalability of Simulation Area • Edge Effects

  10. Analytical Analysis Factors limiting performance: Dropped Packets Real-time communication Limited Local Capacity Clustering Uneven distribution of Load Node Distributions Mobility Collisions Spatial Reuse Limited BW Divisions

  11. Dropped Packets Probability of Dropping a Packet Capacity per Cluster: Number of Data Slot per Frame Nonlinear relation between Load and Pdp Detailed probability distribution of Load is needed

  12. Dropped Packets ps:Probability of a node to be in spurt duration pA:Probability of a node to be in the communication range of a CH pd:Probability of a node that is in the communication range of a CH to choose that CH as its channel access provider Independent of Node Density  assumed constant

  13. Dropped Packets ps:Probability of a node to be in spurt duration pA:Probability of a node to be in the communication range of a CH pd:Probability of a node that is in the communication range of a CH to choose that CH as its channel access provider pdn = ps pA pd

  14. Collisions Number of frames (Nf) vs. co-frame CH separation(dch) Labeling structure used in cellular systems

  15. Collisions co-frame CH separation (dch) vs. number of collisions (fcoll)

  16. Collisions co-frame CH separation (dch) vs. number of collisions (fcoll) • NnCH: Expected number of nodes in the cluster • Nn: Total number of nodes • NC : Number of cluster in 2*rcomm range • V : Region bounded by the circle with radius 2*rcomm around origin • fcoll : number of packets lost per SF due to collision

  17. Agenda Soft Clustering Approaches Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters

  18. Proof of Concept Total Number of Packets Lost per Superframe

  19. Proof of Concept RX Throughput per Superframe

  20. Agenda Soft Clustering Approaches Protocol Overview Analytical Analysis Dropped Packets Collisions Proof of Concept Optimization of TDMA parameters

  21. Optimization of TDMA parameters

  22. Other Uses of the Model Instantaneous Analysis Results for changing Transmission Power Propagation Model PHY Specs: Freq, Threshold values … Asymptotic Behavior Energy Consumption Average node sleep/awake durations Average energy consumption per node Node and CH comparison wrt energy consumption Optimization of Nf wrt energy consumption

  23. Throughput Per Node

  24. Energy Consumption per Node

  25. Thanks! Questions&Comments?

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