Doc.: IEEE 802.11-08/1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 1 Measurements of Coexistence between 802.11n 40MHz and Bluetooth SCO.

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doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 1 Measurements of Coexistence between n 40MHz and Bluetooth SCO Date: Authors:

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 2 Abstract Over-the-air measurements of Bluetooth SCO voice performance in the presence of n 40 MHz link. Results show no difference in impact to quality of nearby Bluetooth SCO voice link due to neighboring n 40MHz link as that of n 20 MHz link

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 3 Setup: Test Case I Wired controlled network on Gigabit switch IxChariot 6.5 traffic is managed on controlled network WiFi link is 2.4GHz/40MHz capable SCO session is created over BT link with ability to control AFH on/off. Windows XP SP2 with Chariot endpoint is used for all stations Clean RF ( GHz) environment verified with spectrum analyzer

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 4 Setup: Test Case II Wired controlled network on Gigabit switch IxChariot 6.5 traffic is managed on controlled network WiFi link is 2.4GHz/40MHz capable SCO session is created over BT1 link with ability to control AFH on/off. BT2 link used as an additional source of interference. Windows XP SP2 with Chariot endpoint is used for all stations Clean RF ( GHz) environment verified with spectrum analyzer

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 5 Deployment Layout Test setup is contained entirely in screen room. Lab room is a basic room –15 ft x 15 ft

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 6 Test Procedure : Case I Controlled network: –All nodes are on the same network –Chariot management traffic is on the controlled network Bluetooth baseline procedure: –All WiFi nodes are powered down –Bi-directional SCO link using HV3 Voice traffic over SCO BT link from master to slave (~72sec standard reference wav file transmission) No silence cancellation, so there is still traffic from slave to master –MOS score calculated based on comparison of reference file sent and received file using Opticom’s OPERA v3.5 voice quality analyzer (PESQ Algorithm). –MOS score averaged over 5 iterations. Bluetooth with traffic procedure: –Bluetooth procedures are the same as baseline –Add WiFi traffic for 90 Seconds –802.11n (max and 22mbps) traffic: 4 pairs – two per direction (Tx, Rx), high performance throughput.scr script –802.11n (1 mbps) traffic: 1 pairs – one per direction (Tx, Rx), throughput.scr script

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 7 Test Procedure : Case II Controlled network: –All nodes are on the same network –Chariot management traffic is on the controlled network Bluetooth baseline procedure: –All WiFi nodes are powered down –Bi-directional SCO link using HV3 Voice traffic over SCO BT link from master to slave (~72sec standard reference wav file transmission) No silence cancellation, so there is still traffic from slave to master –Bidirectional voice traffic on second BT link (1 pair Tx/Rx Chariot voice) as a source of interference. –MOS score calculated based on comparison of reference file sent and received file using Opticom’s OPERA v3.5 voice quality analyzer. –MOS score averaged over 5 iterations. Bluetooth with traffic procedure: –Bluetooth procedures are the same as baseline –Add WiFi traffic for 90 Seconds –802.11n (max and 22mbps) traffic: 4 pairs – two per direction (Tx, Rx), high performance throughput.scr script –802.11n (1 mbps) traffic: 1 pairs – one per direction (Tx, Rx), throughput.scr script

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 8 Test Methodology Measurements made in accordance with test scenarios outlined in 08/971r0 Bluetooth devices comprised of two development platforms from leading BT vendor Bluetooth devices forming Bluetooth link separated by 1 m to model typical distance between headset and cell phone Bluetooth link separated from the link by 0.5 m to model scenario where WLAN connectivity is being using simultaneously with Bluetooth voice call Test measurements conducted for n 40 MHz and n 20 MHz Test conducted with a range of throughput –Max throughput for each system –Comparable throughputs for each system to compare impact based on the same offered load –Minimum throughput tested is 1 Mbps to model typical internet access

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 9 Measurement Baseline BT Mean Opinion Score (MOS) - No present n Throughput – no BT present Test Scenario MHz: 155 Mbps 20 MHz: 71 Mbps Test Scenario 24.0

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 10 Test Scenario 1 – AFH off traffic type: TCP BT link same as baseline 11n 20 MHz: 44 Mbps 11n 40 MHz: 115 Mbps

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 11 Test Scenario 1 – AFH on traffic type: TCP BT link same as baseline 11n 20 MHz: 55 Mbps 11n 40 MHz: 136 Mbps

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 12 Test Scenario traffic type: TCP BT links same as baseline AFH offAFH on 11n 20 MHz Max TPT 11n 40 MHz Max TPT 11n 20 MHz Max TPT 11n 40 MHz Max TPT BT MOS n TPT 42 Mbps90 Mbps52 Mbps105 Mbps BT MOS are identical to Test Scenario n throughput results degraded compared to Test Scenario 2

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 13 Analysis of Results All BT MOS measurements with AFH-on in the presence of n 40MHz are comparable to that of the BT baseline for both Test Case 1 and 2 BT MOS score improves with decreasing n offered load with AFH-off in Test Case 1 No measurable impact due to offered load with AFH-on in Test Case 1 No measurable difference between n 40 MHz and n 20 MHz with regards to BT performance No change in BT MOS score between Test Case 1 and n 20 MHz and 40 MHz max throughput is degraded by BT even with AFH on

doc.: IEEE /1132r0 Submission September 2008 Eldad Perahia (Intel)Slide 14 Conclusions Over-the-air measurements conducted to determine coexistence between n 40 MHz and Bluetooth SCO voice link Measurements demonstrate that neighboring n 40 MHz link has no difference in impact to quality of nearby Bluetooth SCO voice link as that of n 20 MHz link All BT SCO MOS measurements with AFH-on in the presence of n 40MHz are comparable to that of the BT SCO baseline