Proceedings ArticleDOI
E-MiLi: energy-minimizing idle listening in wireless networks
Xinyu Zhang,Kang G. Shin +1 more
- pp 205-216
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TLDR
E-MiLi employs an opportunistic downclocking mechanism to optimize the efficiency of switching clock rate, based on a simple interface to existing MAC-layer scheduling protocols, and can detect packets with close to 100 percent accuracy on the USRP software radio platform.Abstract:
WiFi interface is known to be a primary energy consumer in mobile devices, and idle listening (IL) is the dominant source of energy consumption in WiFi. Most existing protocols, such as the 802.11 power-saving mode (PSM), attempt to reduce the time spent in IL by sleep scheduling. However, through an extensive analysis of real-world traffic, we found more than 60% of energy is consumed in IL, even with PSM enabled. To remedy this problem, we propose E-MiLi (Energy-Minimizing idle Listening) that reduces the power consumption in IL, given that the time spent in IL has already been optimized by sleep scheduling. Observing that radio power consumption decreases proportionally to its clock-rate, E-MiLi adaptively downclocks the radio during IL, and reverts to full clock-rate when an incoming packet is detected or a packet has to be transmitted. E-MiLi incorporates sampling rate invariant detection, ensuring accurate packet detection and address filtering even when the receiver's sampling clock-rate is much lower than the signal bandwidth. Further, it employs an opportunistic downclocking mechanism to optimize the efficiency of switching clock-rate, based on a simple interface to existing MAC-layer scheduling protocols. We have implemented E-MiLi on the USRP software radio platform. Our experimental evaluation shows that E-MiLi can detect packets with close to 100% accuracy even with downclocking by a factor of 16. When integrated with 802.11, E-MiLi can reduce energy consumption by around 44% for 92% of users in real-world wireless networks.read more
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Proceedings ArticleDOI
PLoRa: a passive long-range data network from ambient LoRa transmissions
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References
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WARP: a flexible platform for clean-slate wireless medium access protocol design
TL;DR: This demo demonstrates the flexibility of the interaction between the the WARP PHY and MAC layers by showing the capability to instantaneously change the modulation scheme, disabling/enabling MAC features such as carrier sensing or RTS/CTS 4-way handshake, and different multi-rate schemes.
Demonstration Abstract: WARP – A Flexible Platform for Clean-Slate Wireless Medium Access Protocol Design
Ahmed Khattab,Joseph Camp,Chris Hunter,Patrick A. Murphy,Ashutosh Sabharwal,Edward W. Knightly +5 more
TL;DR: The flexible interface between the medium access layer and the custom physical layer of the Rice University Wireless Open Access Research Platform (WARP) provides a high performance research tool for clean-slate cross layer designs as discussed by the authors.
Journal ArticleDOI
802.11 power-saving mode for mobile computing in Wi-Fi hotspots: limitations, enhancements and open issues
TL;DR: This paper proposes a very simple Cross-Layer Energy Manager (XEM) that dynamically tunes its energy-saving strategy depending on the application behavior and key network parameters and reduces the energy consumption of an additional 20–96% with respect to the standard PSM.