doc.: ieee 802.11-14/0339-00-0hew submission march 2014 raja banerjea, csrslide 1 a simplified...
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doc.: IEEE 802.11-14/0339-00-0hew
Submission
March 2014
Raja Banerjea, CSRSlide 1
A Simplified Simultaneous Transmit and Receive Mechanism
Date: 2014-03-17Authors:
Name Affiliations Address Phone email Raja Banerjea CSR [email protected]
Jim Lansford CSR [email protected]
Naveen Kakani CSR [email protected]
doc.: IEEE 802.11-14/0339-00-0hew
Submission
In band STR (Full Duplex) transmission allows 100% increase in Network throughput. Traditional STR transmission require STR AP and STR capable STA.
We present a simplified STR mechanism which only requires STR capability at the AP and can be supported by traditional STAs.
March 2014
Slide 2 Raja Banerjea, CSR
Abstract
doc.: IEEE 802.11-14/0339-00-0hew
Submission
• Increasing Network Throughput
• In Band STR Challenges
• A simplified STR mechanism
• Analytic results showing STR performance
• Next Steps
March 2014
Slide 3 Raja Banerjea, CSR
Topics
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Increasing Network Throughput
• Max Data Rate based on Shannon Limit = B log 2 (1 + S/N) x
(1- T GI / T SYML )x N data / N carr
• A 5 dB RF Noise Figure + Implementation noise is considered for both the 802.11 sensitivity and the theoretical maximum.
Conclusion: Modulations above 16-QAM ¾ are already spectrally efficient STR allows 100 % increase in network throughput. These gains are difficult to achieve otherwise. Raja Banerjea, CSR
doc.: IEEE 802.11-14/0339-00-0hew
Submission
In Band STR ChallengesMarch 2014
Slide 5
• IEEE 11-13/1122r0 “Considerations for In-Band Simultaneous Transmit and Receive (STR) feature in HEW” presented state of STR technology. Total Cancellation of 110 dB is achievable
• However the system cost is considerable -RF Isolation-Analog Cancellation-Digital Cancellation
• The proposed mechanism enables In Band STR communication using In Band STR capable AP and legacy STAs
Raja Banerjea, CSR
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Proposed STR in WLANMarch 2014
Naveen Kakani, CSRSlide 6
• Leverage attenuation and path loss between STAs to develop a simplified STR solution. The increased complexity is only at the Access Point.
• Access Point uses knowledge of path loss between STAs to Group STAs for In band STR transmission.
Traditional WLAN: Half Duplex transmission
In Band STR Proposed Solution
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Benefits of simplified In Band STR
March 2014
Slide 7
• 100 % increase in network throughput
• No increase in complexity at the STA • Compatible with legacy deployments
• Takes advantage of Wall attenuation and Path Loss
Raja Banerjea, CSR
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Analytical Results
March 2014
Slide 8
• Considered Path Loss between AP and STAs in some typical deployment scenarios
• IEEE 802.11n channel model – L(d) = LFS(d BP) + 35 log10(d / d BP) d > d BP
– LFS(d BP) = 40 dB (2.4 GHz) ; 46 dB (5 GHz)– d BP = 1 m– Wall Loss = 12 dB
• Typical Scenarios• Small Residence ( ~ 1200 sq ft )• Ranch House ( ~ 3000 sq ft )• Class Rooms
Raja Banerjea, CSR
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Analytical Results
March 2014
Raja Banerjea, CSRSlide 9
• AP and STA-1 location was fixed and the path loss measured between AP and STA1 (PL AP_STA-1) and the location and STA-1 ( PL STA-1STA-2)
• Path Loss is measured using the shortest path to estimate distance and number of walls
• If measured difference in Path Loss is greater than TBD dB then In Band STR is feasible in that configuration
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Ranch House ( ~ 3000 sq ft )March 2014
Slide 10
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PL AP_STA1
PL STA1_STA2
Fixed AP
Fixed STA1
STA2
Raja Banerjea, CSR
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Small Residence ( ~ 1200 sq ft )March 2014
Raja Banerjea, CSRSlide 11
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doc.: IEEE 802.11-14/0339-00-0hew
Submission
Ranch House ( ~ 3000 sq ft )March 2014
Raja Banerjea, CSRSlide 12
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doc.: IEEE 802.11-14/0339-00-0hew
Submission
Class RoomsMarch 2014
Raja Banerjea, CSRSlide 13
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doc.: IEEE 802.11-14/0339-00-0hew
Submission
Conclusion
March 2014
Raja Banerjea, CSRSlide 14
• In band STR can increase the network throughput by 100 % • The simplified In band STR mechanism leverages wall attenuation and path loss between STAs and enables STR where only the Access Point is STR capable.
• In Band STR can be used along with MU-MIMO and SU-MIMO and provides increased throughput
doc.: IEEE 802.11-14/0339-00-0hew
Submission
Next Steps
March 2014
Raja Banerjea, CSRSlide 15
• Path Loss Measurements in typical environments
• Measure the allowed co-channel interference • A simplified MAC protocol for In-Band STR
doc.: IEEE 802.11-14/0339-00-0hew
Submission
[1]11-13-1421-01-hew-str-radios-and-str-media-access.pptx
[2] 11-13-0765-02-0hew-co-time-co-frequency-full-duplex-for-802.11-wlan.pptx
[3] 11-13-1122r0-considerations for In-Band Simultaneous Transmit and Receive (STR) feature in HEW
March 2014
Raja Banerjea, CSRSlide 16
References