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Low power MAC for wireless sensor network

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Low power MAC for wireless sensor network

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Low power MAC for wireless sensor network

  1. 1. 1 Fatima Jinnah Women University Rawalpindi
  2. 2. Group members  Attia Iqbal  Hafsa Rashid  Maria Sharif 2 Fatima Jinnah Women University Rawalpindi
  3. 3. TOPIC Low Power MAC For Wireless Sensor Networks 3 Fatima Jinnah Women University Rawalpindi
  4. 4. MAC  Medium access control or media access control (MAC) layer is the lower sublayer of the data link layer (layer 2) of the seven- layer OSI model 4 Fatima Jinnah Women University Rawalpindi
  5. 5. Low power MAC for WSNs  Networks that consists of sensors which are distributed in an ad hoc manner  Low-power MAC protocol, for low-traffic wireless sensor network.  Low power MAC for Wireless sensor networks consists of protocols and algorithms 5 Fatima Jinnah Women University Rawalpindi
  6. 6. Types of MAC protocols There are three types of mac protocols: 1. Fixed-allocation 2. Demand-based 3. Contention-based 6 Fatima Jinnah Women University Rawalpindi
  7. 7. Fixed-allocation MAC protocol Share the common medium It is suitable for sensor network that continuously monitor and generate deterministic data traffic Provide a bounded delay for each node 7 Fatima Jinnah Women University Rawalpindi
  8. 8. Demand-based MAC protocol Channel is allocated according to the demand of the node  Variable rate traffic can be efficiently transmitted  Require the additional overhead of a reservation process 8 Fatima Jinnah Women University Rawalpindi
  9. 9. Contention-based MAC protocol Random-access-based contention for the channel when packets need to be transmitted Suitable for bursty traffic 9 Fatima Jinnah Women University Rawalpindi
  10. 10. Subsystem of node Each node of the sensor networks consist of three subsystem: 1. Sensor subsystem 2. Processing subsystem 3. Communication subsystem 10 Fatima Jinnah Women University Rawalpindi
  11. 11. Sensor subsystem: Senses the environment Processing subsystem: Performs local computations on the sensed data Communication subsystem: Responsible for message exchange with neighboring sensor nodes 11 Fatima Jinnah Women University Rawalpindi
  12. 12. Energy efficient wireless MAC protocol There are four sources of energy waste: 1. Idle listening 2. Overhearing 3. Collisions 4. Protocol overhead 12 Fatima Jinnah Women University Rawalpindi
  13. 13.  Idle listening: Idle listening refers to the active listening to an idle channel  Overhearing: Receive packets destined to others  Collisions: Multiple senders want to talk  Protocol overhead: It refers to the packet headers and the signaling required by the protocol in addition to the transmission of data payloads 13 Fatima Jinnah Women University Rawalpindi
  14. 14.  Energy efficient system extends the WSN’s lifetime and increases its computational capabilities 14 Fatima Jinnah Women University Rawalpindi
  15. 15. Duty-cycling  It is a primary technique significantly improving the energy efficiency of Wireless Sensor Networks (WSNs) 15 Fatima Jinnah Women University Rawalpindi
  16. 16. Types of duty-cycling 1. Synchronous duty-cycling 2. Asynchronous duty-cycling 16 Fatima Jinnah Women University Rawalpindi
  17. 17.  Synchronous duty-cycling: In synchronous duty-cycling, all nodes have synchronized duty cycles  Asynchronous duty-cycling: , In asynchronous duty-cycling, nodes have their own duty cycles 17 Fatima Jinnah Women University Rawalpindi
  18. 18. Power consumption  A large number of sensor nodes  cheap batteries 18 Fatima Jinnah Women University Rawalpindi
  19. 19. Example  Switching the RF(radio frequency) transceiver 19 Fatima Jinnah Women University Rawalpindi
  20. 20. Types of transmission 1. Uplink (from the sensor nodes to the access point) 2. Downlink (from the access point to the sensor nodes) 20 Fatima Jinnah Women University Rawalpindi
  21. 21. 21 Uplink transmission Access points can listen all the time to the channel  Multiple access to the channel Downlink transmission Data transmission without requiring sensor nodes continuously listen to the channel Tradeoff between power consumption and transmission delay Fatima Jinnah Women University Rawalpindi
  22. 22.  If the medium is found busy, a sensor node continues to listen until a data frame is received or until the medium becomes idle again 22 Fatima Jinnah Women University Rawalpindi
  23. 23. Researches about MAC  Liao introduced a high performance low-power 32-bits MAC with Single-Instruction-Multiple-Data (SIMD) feature.  Elguibaly proposed a merged MAC operation and gave an analytical overview of how his technique optimizes the MAC hardware.  Murakami et al. adopted the half array implementation to design a high speed and area-effective MAC architecture. Raghuneth et al. made use of a carry-save multiplier that can simplify sign extension and saturation, and further applies it on the MAC architecture to reduce the unit’s area and power consumption. 23 Fatima Jinnah Women University Rawalpindi
  24. 24.  The 32-bit MAC unit architecture is very large, so the 8-bit MAC unit architecture is used 24 Fatima Jinnah Women University Rawalpindi
  25. 25. Applications OF Low power MAC for WSNs: Health care monitoring Air pollution monitoring Landslide detection Water quality monitoring Natural disaster prevention Industrial monitoring Area monitoring 25 Fatima Jinnah Women University Rawalpindi
  26. 26. References 1. http://www.slideshare.net/shikhathegreat/ppt-on-low-power-wireless-sensor-network- 5th-sem 2. Won, Myounggyu, Taejoon Park, and Sang H. Son. "Asym-MAC: A MAC Protocol for Low-Power Duty-Cycled Wireless Sensor Networks with Asymmetric Links." IEEE Communications Letters 18.5 (2014): 809-812. 3. Shi, Xiaolei, and Guido Stromberg. "SyncWUF: An ultra low-power MAC protocol for wireless sensor networks." IEEE Transactions on Mobile Computing 6.1 (2007): 115- 125. 4. Abdelgawad, A. "Low power multiply accumulate unit (MAC) for future Wireless Sensor Networks." Sensors Applications Symposium (SAS), 2013 IEEE. IEEE, 2013. 5. El-Hoiydi, Amre, and J-D. Decotignie. "WiseMAC: an ultra low power MAC protocol for the downlink of infrastructure wireless sensor networks." Computers and Communications, 2004. Proceedings. ISCC 2004. Ninth International Symposium on. Vol. 1. IEEE, 2004. 26 Fatima Jinnah Women University Rawalpindi
  27. 27. 27 Fatima Jinnah Women University Rawalpindi
  28. 28. 28 Fatima Jinnah Women University Rawalpindi

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