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Life-Add: A novel WiFi design with battery life, throughput and
Life-Add: A novel WiFi design with battery life, throughput and
Background
Background
Background
Background
Background
Background
Background
Background
Background
Background
Background
Background
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Existing Solutions to Prolong Lifetime
Life-Add: Smartphone energy model
Life-Add: Smartphone energy model
Life-Add: Sleep/Wake + Channel Contention
Life-Add: Sleep/Wake + Channel Contention
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Problem formulation
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: Single AP
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Life-Add: general multiple APs
Картинки из презентации «Life-Add: A novel WiFi design with battery life, throughput and fairness improvement» к уроку английского языка на тему «Без темы»

Автор: Yin Sun. Чтобы познакомиться с картинкой полного размера, нажмите на её эскиз. Чтобы можно было использовать все картинки для урока английского языка, скачайте бесплатно презентацию «Life-Add: A novel WiFi design with battery life, throughput and fairness improvement.pptx» со всеми картинками в zip-архиве размером 1185 КБ.

Life-Add: A novel WiFi design with battery life, throughput and fairness improvement

содержание презентации «Life-Add: A novel WiFi design with battery life, throughput and fairness improvement.pptx»
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1Life-Add: A novel WiFi design with 17E{Throughput of Device i} s.t. E{Battery
battery life, throughput and fairness Life of Device i} ? Tmin,i.
improvement. WiOpt 2013. Shengbo Chen*, 18Life-Add: Single AP. Proportional-fair
Tarun Bansal*, Yin Sun*, Prasun Sinha and Utility Maximization max ? log
Ness B. Shroff Dept. ECE & CSE, The E{Throughput of Device i} s.t. Maximal
Ohio State University. device-ON probability: bi Variables:
2Background. Battery life is a serious average sleep period 1/Ri. Pr{Device i’s
problem for most smartphone users WiFi, 4G RF is ON}? bi.
LTE, GPS, Bluetooth, screen, CPU, ... Web 19Life-Add: Single AP. Proportional-fair
browsing via WiFi Test results in April Utility Maximization max ? log
2013 by Battery life < 11 hours for E{Throughput of Device i} s.t. Maximal
most popular smartphones. iPhone 5 device-ON probability: bi Variables:
802.11n. Samsung Galaxy S 4 802.11ac. HTC average sleep period 1/Ri Non-convex
One 802.11ac. Asynchronous network with collisions
3Existing Solutions to Prolong Channel access probabilities of the
Lifetime. Mobile Charging? Additional devices are coupled We propose a solution:
equipment Solar charger portable battery Life-Add Theorem: Asymptotically optimal,
wireless charger Reduce power when sensing as Tsensing /(Tdata + TACK)?0 E.g.,
Lower hardware clock-rate [E-MiLi, Mobicom 802.11b: Tsensing= 4us, Tdata +
11] Broadcom SoC Solution 802.11 ac Used TACK=511us~1573us. Pr{Device i’s RF is
in HTC One and Samsung Galaxy S 4 Test: ON}? bi.
7.8 hours by Trade bandwidth/throughput 20Problem formulation. where , is a
for power reduction Cannot have both scaling constant is the transmission
benefits. success probability is the device-ON
4IEEE 802.11 Standard Evolution. probability Proof idea: Problem structure,
Physical layer Significant evolutions KKT necessary conditions Upper and lower
towards high throughput MAC CSMA/CA and bounds converge to the same value.
its enhancements QoS, security, frame 21Life-Add: Single AP. Implementation
aggregation, block ACK. WLAN. 802.11- 1997 procedure: Each device reports bi to the
2 Mbps, DSSS, FHSS. 802.11b 11 Mbps, CCK, AP The AP computes , and broadcast them to
DSSS. 802.11n 600 Mbps with 4x4 MIMO, the devices If , If , Device n uses and to
20/40 MHz BW, 2.4 or 5 GHz. 802.11a 54 compute Use to generate the sleeping
Mbps, OFDM, 5 GHz. 802.11p 27 Mbps,10 MHz period Low complexity, easy to implement.
BW, 5.9 GHz. 802.11af TVWS. TV White Pr{Device i’s RF is ON}? bi.
Spaces. Wireless Access for Vehicular 22Life-Add: Single AP. NS-3 simulation
Environment. 802.11g 54 Mbps, OFDM, 2.4 for a homogeneous scenario Red curve:
GHz. 802.11ac 256QAM 160MHz. Wireless simulated performance with no
Gigabit, <6 GHz. 802.11ad. Wireless approximation Blue point: closed form
Gigabit, 60 GHz. solution of Life-Add Observation: Life-Add
5Can we do better? Life-Add: An is near optimal The renewal process model
innovative MAC design Battery Lifetime is reasonably accurate.
Avoid unnecessary sensing Throughput 23Life-Add: general multiple APs. Too
Reduce collisions and starvations Fairness complicated interference model Global
Near-far effect. B. L. E. T. I. F. E. I. optimization is very difficult Near-far
M. E. N. R. F. A. I. N. E. E. S. S. F. I. effect Device 1 can access the channel all
U. G. H. P. U. T. T. R. O. T. H. the time Device 2 is in starvation Hidden
6Contents. Background Life-Add: An terminal problem Two devices cannot sense
innovative MAC design Simulation Results each other and cause collisions.
Summary. 24Life-Add: general multiple APs.
7Life-Add: Smartphone energy model. Near-far effect Node collaboration Device
Power source: Strong: Wall power, portable 1 computes the two values of average sleep
battery Weak: Solar charger Other period suggested by AP 1 and AP 2 Device 1
components 4G LTE, CPU, screen, … WiFi chooses the longest average sleep period
chip ON: Transmit/receive/sensing High to reduce collisions with Device 2, which
power consumption OFF: Sleep Very low is vulnerable To care for the vulnerable.
power consumption Too much sensing means a 25Life-Add: general multiple APs. Hidden
significant waste of energy Sleep/wake terminal problem Increase average sleep
(asynchronous). period after a collision Reset average
8Life-Add: Sleep/Wake + Channel sleep period after a successful
Contention. Uplink. Device 1. Device 1. transmission Similar idea to 802.11 MAC.
Device 2. Device 2. AP. AP. ACK. 26Life-Add: general multiple APs.
9Life-Add: Sleep/Wake + Channel Implementation procedure: Each device
Contention. Uplink. Device 1 wakes up reports bi to nearby APs Each AP computes
earlier and senses the channel. Device 1. and broadcasts and If , If , Device n uses
Device 1. Device 2. Device 2. AP. AP. ACK. and to compute suggested by nearby APs
10Life-Add: Sleep/Wake + Channel Choose to use the smallest value Reduce at
Contention. Uplink. Device 1 transmits, collision, reset after receiving ACK Use
Device 2 goes back to sleep. Device 1. to generate the sleeping period.
Device 1. Device 2. Device 2. AP. AP. 27Life-Add: general multiple APs. NS-3
Data. ACK. simulation results: Uplink: 4 APs, 30
11Life-Add: Sleep/Wake + Channel smartphones, randomly located in a 500?500
Contention. Uplink. AP replies an ACK to m field, UDP saturation bi = 1 ? no
Device 1. Cycle 1 completes. Device 1. lifetime (power-ON prob.) constraints 1/3
Device 1. Device 2. Device 2. AP. AP. with battery, 1/3 with battery + solar
Cycle 1. Data. ACK. ACK. panel, 1/3 to wall power Battery level:
12Life-Add: Sleep/Wake + Channel uniform distribution within 200~1000 mAh
Contention. Uplink. Devices 1 and 2 wake Lifetime and throughput benefits.
up at almost the same time. Device 1. 28Life-Add: general multiple APs. NS-3
Device 1. Device 2. Device 2. AP. AP. simulation results: Per-device
Cycle 1. Data. ACK. ACK. performance: Battery life improvement for
13Life-Add: Sleep/Wake + Channel all 5 devices Significant throughput
Contention. Uplink. A collision occurs, increase for the low-rate device.
followed by a timeout. Cycle 2 completes. 29Life-Add: general multiple APs.
Device 1. Device 1. Device 2. Device 2. Average performance gain Battery Life:
AP. AP. Cycle 2. Cycle 1. Data. Data. Sleep/Wake Throughput: Node collaboration
Data. ACK. ACK. (reduce collisions and starvations)
14Uplink A new renewal process model: Parameter optimization Fairness: Node
each cycle is an i.i.d. period Requires 2 collaboration (to care for the vulnerable)
assumptions: Exponential distributed sleep Proportional-fair utility.
period: Memoryless (independent from last 30Life-Add: general multiple APs.
cycle) Tdata + TACK? Tcollision + Ttimeout Coexisting with IEEE 802.11 AP 1,2 and
(only assumed in analysis, not in their users upgrade from IEEE 802.11 to
simulations). Life-Add: Sleep/Wake + Life-Add Battery life Longer if you use
Channel Contention. Device 1. Device 1. Life-Add Throughput Higher no matter you
Device 2. Device 2. AP. AP. Cycle 2. Cycle use Life-Add or not, due to less
1. Data. Data. Data. Data. ACK. ACK. collisions.
15Life-Add vs IEEE 802.11. Life-Add IEEE 31Summary. A novel renewal process model
802.11 Sleep backoff vs sensing backoff for energy efficient WiFi design
(save energy) Renewal process vs 2D Markov Proportional-fair utility maximization
chain [Bianchi 2000] (simplify problem Non-convex Life-Add MAC design
optimization). Device 1. Device 2. AP. Near optimal for single AP cases Alleviate
Device 1. Device 2. AP. Cycle 2. Cycle 1. “near-far effect” and “hidden terminal
Data. Data. Data. Data. ACK. ACK. Data. problem” in general cases Easy to
Data. Data. Data. ACK. ACK. implement Ns-3 simulations Battery life,
16Life-Add: Downlink. Still a renewal throughput, and fairness improvement
process Uplink: sleep + data + overhead Coexists harmoniously with IEEE 802.11 Not
(ACK/collision/timeout) Downlink: sleep + just WiFi: Last-hop decentralized access
data + overhead Internet of Things, Military,… US patent
(ACK/Ps-poll/collision/timeout) Additional filed.
Ps-poll packet as part of overhead Can be 32Tasks to do… More simulations for
modeled together. A short Ps-poll packet joint uplink and downlink Practical
is used to contend for the channel. Device traffics Web browsing, video streaming,
1. Device 2. AP. Cycle 2. Cycle 1. email, searching Hardware testing.
Ps-poll. Ps-poll. ACK. ACK. Ps-poll. Data. 33Thank you. B. E. T. L. I. F. I. M. E.
Data. Beacon. E. N. R. F. A. I. N. E. E. S. S. F. I. U.
17Life-Add: Single AP. Proportional-fair P. T. G. H. U. T. T. H. R. O.
Utility Maximization max ? log
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