Realizing the Full Potential of PSM using Proxying

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Presentation transcript:

Realizing the Full Potential of PSM using Proxying Ning Ding Abhinav Pathak Y. Charlie Hu Clay Shepard Lin Zhong Dimitrios Koutsonikolas

Smartphone is Energy Constrained Battery capacity only doubles in last 15 years 3G/4G GPS CPU Screen WiFi Camera

WiFi Energy Consumption Data AP … … Phone Data Idle Even in idle, WNIC drains out battery in 6-10 hrs! Send WiFi NIC Power (mW) Recv 1000mW Idle Listen 765mW 650mW Time (ms)

Modes of WiFi NIC Constant Awake Mode (CAM) Power Saving Mode (PSM) Send, Recv, Idle Listen High power Power Saving Mode (PSM) Cannot send/recv/idle listen Very little power

WiFi: Power Saving Mode Beacon Beacon Beacon Beacon AP 100ms 100ms 100ms Beacon Phone WiFi NIC Power (mW) Time (ms)

WiFi: Power Saving Mode (cont’d) Server Data PSM Wake-up Delay PSM does not come for free! Beacon AP Phone WNIC in PSM, cannot recv WNIC switch to CAM WiFi NIC Power (mW) Time (ms)

PSM Energy - performance trade off Two implementations of PSM Static PSM Dynamic PSM

Static PSM Server AP Phone Static PSM WiFi NIC Power Flow Time: 300ms Data SYNACK Wake-up Delay Wake-up Delay Wake-up Delay ACK SYNACK AP Beacon SYN Req Phone Static PSM Flow Time: 300ms Energy: 3 μAh WiFi NIC Power (mW) Already in PSM Time (ms)

Dynamic PSM Server AP Phone Static PSM Flow Time: 300ms Energy: 3 μAh Data SYN ACK ACK AP Beacon SYN Req Phone PSM Timeout Static PSM Flow Time: 300ms Energy: 3 μAh Dynamic PSM Flow Time: 90ms Energy: 10 μAh WiFi NIC Power (mW) Time (ms)

Motivation Performance Energy Static PSM Dynamic PSM Can we make it ?

Understand Dynamic PSM Server AP Phone RTT Phone PSM Timeout Nokia N900 200ms HTC Nexus One iPhone 4 95ms PSM Timeout Key: PSM Timeout > RTT

Percy: Design 1. 2. AP Split-TCP Proxy AP PSM Timeout 200ms/95ms

Percy: Short Flows Server AP+Proxy Phone Static PSM Flow Time: 300ms Data Server SYN Data SYN ACK Req ACK Req AP+Proxy Beacon SYN Phone Static PSM Flow Time: 300ms Energy: 3 μAh Dynamic PSM Flow Time: 90ms Energy: 10 μAh Percy Flow Time: 110ms Energy: 4 μAh WiFi NIC Power (mW) Time (ms)

Percy: Long Flows Periodical Flush WiFi NIC Power (mW) Time (ms) SYN Data Req SYN ACK ACK SYN Req Beacon Periodical Flush WiFi NIC Power (mW) Time (ms)

Evaluation Trace-driven experiment PSM configurations 10-phone 1-week trace 38,069 HTTP flows PSM configurations Percy Static PSM Dynamic PSM: Nokia N900 HTC Nexus One iPhone 4

Result – Energy Consumption 67% 44% Total energy consumption for different PSM schemes

Result – Network Performance Time (ms) CDF of flow time difference compared to Android PSM configuration

Conclusion Existing PSMs have inherent problems A simple system: Percy improve the energy savings maintain good performance Percy saves 44-67% energy while incur minimal flow time elongation