O pen Dy namic S pectum S haring with minimal E nerg Y
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Open Dynamic Spectum Sharing with minimal EnergY Our Odyssey* towards Cognitive Radio *1. An extended adventurous voyage or tri 2. An intellectual or spiritual quest.
description
O pen Dy namic S pectum S haring with minimal E nerg Y. Our Odyssey* towards Cognitive Radio. * 1. An extended adventurous voyage or trip. 2. An intellectual or spiritual quest. A range of technologies for a range of requirements. Many technologies share the same spectrum. 22 MHz. - PowerPoint PPT Presentation
Transcript of O pen Dy namic S pectum S haring with minimal E nerg Y
Open Dynamic Spectum Sharing with minimal EnergY
Our Odyssey* towards
Cognitive Radio
*1. An extended adventurous voyage or trip. 2. An intellectual or spiritual quest.
A range of technologiesfor a range of requirements
1995 2000 2005 2010
10 kbps 100 kbps 1 Mbps 10 Mbps 100 Mbps 1 Gbps
WIMAX
Low speed/
Stationary
2G(digital)
3GMultimedia
3G+
1G(analog)
Medium speed
802.16e
2.4 GHzWLAN
5 GHzWLAN
High rate WLAN
GSMCDMAone
Bluetooth
60 GHz WPAN
4Gresearch
target
UMTSCDMA2000
High speed GPRS
EDGE
3GPP -LTE+
UWB WPAN
1995 2000 2005 2010
10 kbps 100 kbps 1 Mbps 10 Mbps 100 Mbps 1 Gbps
WIMAX
Low speed/
Stationary
2G(digital)
3GMultimedia
3G+
1G(analog)
Medium speed
802.16e
2.4 GHzWLAN
2.4 GHzWLAN
5 GHzWLAN5 GHzWLAN
High rate WLAN
GSMCDMAone
Bluetooth
60 GHz WPAN
4Gresearch
target
UMTSCDMA2000
High speed GPRS
EDGE
3GPP -LTE+
UWB WPAN
Many technologies share the same spectrum
2.4 GHz example
5 MHz
Sensors0dBm
2 MHz
2.4 GHz
WLAN~15dBm
22 MHz
2.4 GHz
Bluetooth0dBm
1 MHz
2.4 GHz
Spectrum Sharing Further Classification in 4 Sub Projects
OdysseySpectrum Sharing
Heterogeneous networks Time/Space/Frequency
Adaptation Capabilites
Pol
icie
s/P
riorit
ies
Only one adapts (asymm)
Het
erog
eneo
us
Cap
abili
ties
Heterogeneous
Policies
PER: 10%
802.15.4 Low load
+802.11
SU should Not harm
PU
PU QoS
SU
QoS
Only SU acts
Both adapt (symm)
Het
erog
eneo
us
Pol
icie
s
Heterogeneous
Capabilities
802.11 Packets per Second
0
50
100
150
200
250
640 320 0
802.15.4 Rate
Packets per Second
802.11 at 1Mbps
802.11 at 5.5MbpsPunishment
802.15.4 High load
+ 802.11
802.11ResourcePlanning
With priorities PU QoS
SU
QoS
PU-SU game
Capturing context or spectrum information is costly
• Active observations: try out a configuration
trade-off between
exploitation
and
exploration
• Passive observations– Require extra hardware or introduce delay– Energy costly
Requir
ed B
W
Channel Sequence
Active observations:Gambling for the best channel
PER: 5% PER: 10% PER: 50%
• Just send packets and learn the best performing channel
• No (wrong) model, no (false) assumptions, perfect adaptation to any situation
• If you do not have to obey a policy rule
Multi-armed bandit theory gives us the optimal strategy
802.15.4 searches it’s best channel in ISM band (11-26)
Predicting PU idle time
Switching to a channel that will remain idle longerminimizes switching overhead
Improve channel selection with efficient passive scanning
Measuring interference power by Nyquist sampling is expensive (ADC cost, large amount of data to transfer)
Information is only in the edges: new sampling method that converts analog signals directly into information
ADC
802.15.4 packets
Collision with 1 802.11packet
AIC
What is the best multichannel MAC design?
Spatial planningKeep-Out-Region in theory
Fie
ld S
tren
gth
41dBu
F(50,90)
Desired/Undesired:28dB for DTV
Required Sensitivity
F(50,10)
Distance SU from contour
Contour size
Pathloss trend in reality
Resulting Spatial Reuse much improved
PU QoS
SU
Qo
SOnly SUacts
Proposed a run-time technique to predict and flood pathloss trends and coverage
SU sensing requirements as function of SU density
Spectrum Sharing Further Classification in 4 Sub Projects
OdysseySpectrum Sharing
Heterogeneous networks Time/Space/Frequency
Adaptation Capabilites
Pol
icie
s/P
riorit
ies
Only one adapts (asymm)
Het
erog
eneo
us
Cap
abili
ties
Heterogeneous
Policies
PER: 10%
802.15.4 Low load
+802.11
SU should Not harm
PU
PU QoS
SU
QoS
Only SU acts
Both adapt (symm)
Het
erog
eneo
us
Pol
icie
s
Heterogeneous
Capabilities
802.11 Packets per Second
0
50
100
150
200
250
640 320 0
802.15.4 Rate
Packets per Second
802.11 at 1Mbps
802.11 at 5.5MbpsPunishment
802.15.4 High load
+ 802.11
802.11ResourcePlanning
With priorities PU QoS
SU
QoS
PU-SU game
Are there scenarios where both 802.15.4 and 802.11 want to adapt
• 802.15.4 harms 802.11 in measurements
802.15.4 onthen 802.11throughput down
Coexistence approach does not work
802.15.4 is not expected to harm 802.11 because:• 802.15.4 output power is >15dB lower than 802.11• 802.15.4 does a listen-before-send
802.11 packet @ 1Mbps
802.15.4 packet train pausedfor 802.11 transmission:802.15.4 detects 802.11
collision because 802.15.4 sensing resolution is coarse
PU identification: which PU present on which channels
802.11 at channel 1
802.11 at channel 6 802.15.4
No presence802.11 at
channel 1 and 6
we can identifydifferent PU’s
SU QoS depends on PU requirements and sensing performance
Can we build a PU-SU game?
PU QoS
SU
Qo
SOnly SUacts
Open Dynamic Spectrum Sharing with minimal Energy
• Contibutors– UC Berkeley
• Maryam,Youwei, Ian, Carl, Mehdi, Nikhil, Wilson
– IMEC• Michael
– TU Delft• Przemek
– VTT• Marko
– Stanford University• Ali, Bart
