Spectrum Mask in IEEE802.11p Date: 2008-03-18 Authors: March 2008 doc.: IEEE 802.11-08/0362r0 March 2008 Spectrum Mask in IEEE802.11p Date: 2008-03-18 Authors: Hanbyeog Cho (ETRI) Hanbyeog Cho (ETRI)

March 2008 doc.: IEEE 802.11-08/0362r0 March 2008 Abstract We present the spectrum mask based on the FCC rule. WAVE system specification has mismatched spectrum masks. It means that PER(packet error rates) will be increased due to channel interference between adjacent channels. This presentation is a following work to the presentation by Vinuth Rai &John Kenny last San Fransisco meeting (17 July, 2008) The main focus is on the spectrum mask related FCC rule and the spectrum mask should fulfill [55+10log(P)], -25dBm criteria Then proposed spectrum mask will decrease the interference between adjacent channels Hanbyeog Cho (ETRI) Hanbyeog Cho (ETRI)

Contents Introduction Cross-Channel Interference Wave Regulation March 2008 Contents Introduction Cross-Channel Interference Wave Regulation Spectrum Mask Hanbyeog Cho (ETRI)

March 2008 Introduction This presentation is relating to the presentation by Vinuth Rai &John Kenny last San Fransisco meeting(17 July, 2008) 11-07-2133-00-000p-cross-channel-interference-test-results-a-report-from-the-vsc-a-project.ppt Main focus : Interference adjacent channel Spectrum Mask to fulfill [55+10log(P)], -25dBm criteria Spectrum Mask to fulfill [55+10log(P)] criteria 기준을만족하는 Hanbyeog Cho (ETRI)

Cross-Channel Interference March 2008 Cross-Channel Interference Effect of cross-channel interference - Transmit power & channel allocation  cross-channel interference - Increasing PER - Solution Need sharp spectrum mask Ce = Co – Ci - Ce : Total available channel - Co : Original channel - Ci : Channel interference Channel 2 Ce Ci Channel 1 Channel 3 Interference Spectrum Mask to fulfill [55+10log(P)] criteria 기준을만족하는 Hanbyeog Cho (ETRI)

Cross-Channel Interference : Example – Using WAVE March 2008 Cross-Channel Interference : Example – Using WAVE Toyota ITC test Result : Adjacent interference - Tx Channel : 172 - Interferer Channel: 174 Toyota ITC test Result : Non-adjacent interfer - Tx Channel : 172 - Control Channel: 178 RX-Interferer Distance (meters) 60 0% 40 10% 30 1% 80% 25 0.5% 99% 20 40% 90% 100% 15 92% 95% 12.5 0.10% 1.50% 70% 98% 10 0.90% 35% 7.5 15% 5 55% 2.5 Legend: PER > 10% 50 100 150 200 RX-TX Distance (meters) Spectrum Mask to fulfill [55+10log(P)] criteria 기준을만족하는 Cross-channel interference test results - Adjacent channel interference . Packet Error: [Tx-Rx distance] / [Int-Rx distance] > 10 if [PTx =PRx] - Non-adjacent channel interference . Less importance Hanbyeog Cho (ETRI)

Maximum device output power Reduction in Power Spectral Density, dBr March 2008 Wave Regulation Device classes and Tx power levels Device class Maximum device output power Class A 0 (dBm) 1mW Class B 10 (dBm) 10mW Class C 20 (dBm) 100mW Class D 28.8 (dBm) 750mW Wave spectrum mask (D3.0) Device class Reduction in Power Spectral Density, dBr 4.5MHz Offset 5.0Mhz Offset 5.5MHz Offset 10MHz Offset 15MHz Offset Class A -10 -20 -28 -40 Class B -16 Class C -26 -32 -50 Class D -35 -45 -55 -65 Spectrum Mask to fulfill [55+10log(P)] criteria 기준을만족하는 Hanbyeog Cho (ETRI)

IEEE 802.11p Spectrum Mask (revision) March 2008 IEEE 802.11p Spectrum Mask (revision) IEEE 802.11p/D1.1 The DSRC transmitted spectrum mask is relative to the device class of operation. The power in the transmitted spectrum for all DSRC devices shall be –25 dBm or less within 100 kHz outside all channel and band edges. This will be accomplished by attenuating the transmitted signal 100 kHz outside the channel and band edges by 55 + 10log(P) dB, where P is the total transmitted power in watts. The transmitted spectral density of the transmitted signal for all devices shall fall within the spectral mask, as detailed in Table I.7. The measurements shall be made using a 100 kHz resolution bandwidth and a 30 kHz video bandwidth. Spectrum Mask using 55+10log(P) , -25dBm Class 4.5MHz Offset 5.0Mhz Offset 5.5MHz Offset 10MHz Offset 15MHz Offset Class A -10 -20 -25 -28 -33 -40 -45 Class B -16 -35 -43 -55 Class C -26 -32 -53 -50 -63 Class D -53.8 -63.8 -65 -73.8 Spectrum Mask to fulfill [55+10log(P)] criteria 기준을만족하는 Hanbyeog Cho (ETRI)

Spectrum Mask IEEE 802.11p vs IEEE 802.11p/D1.1 March 2008 Class A -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Class A -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Class B Class C -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Class D -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Decrease the inter-channel interference This contribution suggests an equation to fulfill the FCC regulation Hanbyeog Cho (ETRI)

March 2008 Conclusions We proposed basic spectrum masks to fulfill the FCC regulation rule. A present WAVE system specification has mismatched spectrum masks. It means that PER(packet error rates) will be increased due to channel interference between adjacent channels. This presentation is a following work to the presentation by Vinuth Rai &John Kenny last San Francisco meeting (17 July, 2008) . The proposed spectrum mask will decrease the interference between adjacent channels and the main focus is on the spectrum mask related FCC rule. Then the spectrum mask should be modified to fulfill [55+10log(P)], -25dBm criteria. Hanbyeog Cho (ETRI)

March 2008 Insert the following text, table, and figures at the end of subclause I.2.3: For operation in the 5.85 - 5.925 GHz band in the USA, FCC CFR47 [B8], Section 90.377 and Section 95.1509, the transmitted spectrum shall be as follows and are summarized in Table I.7. I.2.3 Transmit spectrum mask: The DSRC transmitted spectrum mask is relative to the device class of operation. The power in the transmitted spectrum for all DSRC devices shall be –25 dBm or less within 100 kHz outside all channel and band edges. This will be accomplished by attenuating the transmitted signal 100 kHz outside the channel and band edges by 55 + 10log(P) dB, where P is the total transmitted power in watts. The transmitted spectral density of the transmitted signal for all devices shall fall within the spectral mask, as detailed in Table I.7. The measurements shall be made using a 100 kHz resolution bandwidth and a 30 kHz video bandwidth. The transmitted spectral mask for class A, B, C, and D devices are shown in Figures. I.3, I.4, I.5, and I.6. a) For Class A operation using 10 MHz channel spacing, the transmitted spectrum shall have a 0 dBr bandwidth not exceeding 9 MHz, and shall not exceed -10 dBr at 5 MHz frequency offset, -25 dBr at 5.5 MHz frequency offset, -33 dBr at 10 MHz frequency offset, -45 dBr at 15 MHz frequency offset and above. Figure I.3 shows the spectral mask for Class A operation. b) For Class B operation using 10 MHz channel spacing, the transmitted spectrum shall have a 0 dBr bandwidth not exceeding 9 MHz, and shall not exceed -16 dBr at 5 MHz frequency offset, -35 dBr at 5.5 MHz frequency offset, -43 dBr at 10 MHz frequency offset, -55 dBr at 15 MHz frequency offset and above. Figure I.4 shows the spectral mask for Class B operation c) For Class C operation using 10 MHz channel spacing, the transmitted spectrum shall have a 0 dBr bandwidth not exceeding 9 MHz, and shall not exceed -26 dBr at 5 MHz frequency offset, -45 dBr at 5.5 MHz frequency offset, -53 dBr at 10 MHz frequency offset, -63 dBr at 15 MHz frequency offset and above. Figure I.5 shows the spectral mask for Class C operation. d) For Class D operation using 10 MHz channel spacing, the transmitted spectrum shall have a 0 dBr bandwidth not exceeding 9 MHz, and shall not exceed -35 dBr at 5 MHz frequency offset, -53.8 dBr at 5.5 MHz frequency offset, -63.8 dBr at 10 MHz frequency offset, -73.8 dBr at 15 MHz frequency offset and above. Figure I.6 shows the spectral mask for Class D operation.

Table I.7— Class A thru Class D spectrum masks March 2008 Table I.7— Class A thru Class D spectrum masks Class 4.5MHz Offset 5.0Mhz Offset 5.5MHz Offset 10MHz Offset 15MHz Offset Class A -10 -25 -33 -45 Class B -16 -35 -43 -55 Class C -26 -53 -63 Class D -53.8 -63.8 -73.8 Hanbyeog Cho (ETRI)

Spectrum Mask March 2008 Class A Class B -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Class A -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Class B Figure I.3—Class A transmit spectrum mask Figure I.4—Class B transmit spectrum mask Class C -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Class D -15 -10 -5 5 10 15 -70 -60 -50 -40 -30 -20 Offset Frequency(MHz) Power Attenuation(dBr) Decrease the inter-channel interference This contribution suggests an equation to fulfill the FCC regulation Figure I.5—Class C transmit spectrum mask Figure I.6—Class D transmit spectrum mask Hanbyeog Cho (ETRI)

Approve: Disapprove: Abstain: March 2008 Motion (if technical and/or significant): Move to accept the proposed text , table and figures from above slide 11,12 and 13 and instruct the TGp editor to incorporate the proposed changes. Motion by: Hanbyeog Cho Date: Second: ______________________ Approve: Disapprove: Abstain: Hanbyeog Cho (ETRI)