Triple Beat Distortion in 3GPP Wireless Networks
Explore the analysis of triple beat distortion in 3GPP wireless networks, focusing on the detection mechanisms, causes, and solutions for this phenomenon. Learn how triple beat distortion affects both transmission and reception paths, and discover strategies to mitigate its impact on network performance.
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3GPP TSG-RAN WG4 Meeting #99-e Electronic meeting, 19 27 May 2021 R4-2107803 WF on MSD due to triple beat of intra-band UL CA UL + FDD UL configurations Qualcomm Inc., Skyworks Inc.,
Background 3A_n7B 28A_n7B 1A_n7B 1C_n3A 2C_n41A 2C_n71A 2A_n77(2A) 3A_n41C 3C_n1A 3C_n5A 3C_n7A 3C_n28A 3C_n41A 3A_n77(2A) 3A_n78(2A) 3C_n77A 3C_n78A 3C_n79A 7C_n1A 7C_n3A 7C_n5A 7C_n28A 7C_n78A 8A_n79C 25A_n41C 30_n77(2A) 39C_n41A 40C_n78A 41C_n3A 41C_n77A 41C_n78A 41C_n79A 42C_n28A 42C_n3A 66_n77(2A) Band combinations with 3 ULCCs were analyzed in [1] 3 active UL CCs create triple beat distortion and can lead to RX de-sensitization. Suspect band combinations from [1][2] that were detected to create triple beat distortion are highlighted and shown in table on the right ->
Background - detection The detection mechanism for the 1storder triple beat is shown below from [2] Duplex Offset is the duplex offset of the victim FDD band ULCAMBWis the non-contiguous 2 tone allocation spacing TXMBWand RXBW is the FDD victim band TX transmission measured BW and the RX DL channel BW respectively Band Y UL Band X_DL Band X_UL 1storder TripleBeat 2ndorder TripleBeat TripleBeat 3rdorder TripleBeat ULCAMBW ULCAMBW ULCAMBW ULCAMBW ULCAMBW Duplex
Background - analysis Triple beat distortion occurs at RX and TX and is a 3rdorder non-linearity that is mainly (TX22TX1) and is more prominent for non-contiguous RB allocations. For TX Both forward and reverse triple beat products can occur at the transmitter It was shown that the triple beat distortion at the ULCA transmitter path is dominant for TX due to 2:1 variation with ULCA output power PCB isolation from FDD band PA to ULCA band PA will affect forward TX distortion ULCA Filter rejection and antenna isolation will affect the reverse TX distortion For RX RX path filter rejection for both TX bands and the 3rdorder non-linearity specification determines the RX triple beat distortion Power Back-off For ULCA band, the power is backed off to meet the general emission requirements or CA_NS_04 requirement. this can be a function of tone spacing. For FDD band, the power is backed off to meet the NS_01 requirement Backed off power must meet the power class requirement Worst case triple beat will occur with equal power on the 3ULCCs if both power class and emission requirements are met.
WF: Example Analysis PC3 capable bands Tentatively agree on the following MSD values for the following band combinations for power class 3. Further verify power back off to meet power class and emission requirements ie. DC_3A_n77(2A), DC_3A_n78(2A) are at MSD = [0]dB, pending further verification for back-off and RX linearity Further check if triple beat can land in a 3rdDL carrier other than duplex offset of FDD carrier Back-off can be applied per carrier as indicated or per band. DC_3A_n41C DC_25A_n41C DC_8A_n79C DC_28A_n7B DC_3C_n5 DC_7C_n5 DC_3A_n77(2A) DC_3A_n78(2A) 3A -4.78 n41C -4.78 25A -1 n41C -11.5 8A -4.78 n79C -4.78 28A -2 n7B -8.5 3C -8.5 n5 -2 7C -8.5 n5 -2 3A -1 n77(2A) -12 3A -1 n78(2A) -12 Back-off per Carrier, dB PA output Data, dBm Reverse TB-ULCA PA Forward TB-ULCA PA Reverse TB-FDD PA Forward TB-FDD PA -72.3 -78.3 -119.3 -123.3 -82.0 -84.7 -108.0 -142.5 -102.3 -100.3 -139.3 -143.3 -99.0 -102.6 -123.0 -145.8 -87.0 -102.6 -111.0 -133.8 -99.0 -71.6 -123.0 -145.8 -95.0 -71.7 -116.0 -150.5 -95.0 -71.7 -116.0 -150.5 LNA referred input, dBm Reverse TB-ULCA Forward TB-ULCA Reverse TB-FDD Forward TB-FDD PLNA TB _FDD RX DLNA TB_FDD RX IMD15 PLNA -112.3 -118.3 -174.3 -178.3 -87.7 DLNA -112.3 -118.3 -174.3 -178.3 PLNA -122.0 -124.7 -163.0 -197.5 -95.8 DLNA -122.0 -124.7 -163.0 -197.5 PLNA -152.3 -150.3 -194.3 -198.3 -110.3 DLNA -152.3 -150.3 -194.3 -198.3 PLNA -149.0 -152.6 -178.0 -200.8 -105.0 DLNA -149.0 -152.6 -178.0 -200.8 PLNA -137.0 -152.6 -166.0 -188.8 -96.4 DLNA -137.0 -152.6 -166.0 -188.8 PLNA -149.0 -121.6 -178.0 -200.8 -105.0 DLNA -149.0 -121.6 -178.0 -200.8 PLNA -140.0 -116.7 -166.0 -200.5 -111.0 DLNA -140.0 -116.7 -166.0 -200.5 PLNA -140.0 -116.7 -166.0 -200.5 -111.0 DLNA -140.0 -116.7 -166.0 -200.5 -87.7 -99.8 -95.8 -106.5 -110.3 -105.0 -96.4 -105.0 -116.0 -116.0 -99.8 -106.5 Antenna referred, dBm TB_Emission_dBm TX_IM2 Tx_noise TX_total Themal Composite PRX -83.4 -119.5 -104.2 -83.4 -96.0 -83.2 DRX -83.4 -119.5 -104.2 -83.4 -96.0 -83.2 PRX -91.4 -112.0 -99.3 -90.7 -96.0 -89.6 DRX -91.4 -112.0 -99.3 -90.7 -96.0 -89.6 PRX -106.3 -119.5 -104.1 -102.0 -96.0 -95.0 DRX -106.3 -119.5 -104.1 -102.0 -96.0 -95.0 PRX -101.0 -114.0 -100.7 -97.7 -91.0 -90.2 DRX -101.0 -114.0 -100.7 -97.7 -91.0 -90.2 PRX -95.4 -114.0 -98.5 -93.6 -91.0 -89.1 DRX -95.4 -114.0 -98.5 -93.6 -91.0 -89.1 PRX -103.9 -114.0 -98.5 -97.3 -91.0 -90.1 DRX -103.9 -114.0 -98.5 -97.3 -91.0 -90.1 PRX -106.0 -112.0 -100.5 -99.2 -96.0 -94.3 DRX -109.3 -112.0 -100.5 -99.7 -96.0 -94.4 PRX -106.0 -112.0 -100.5 -99.2 -96.0 -94.3 DRX -109.3 -112.0 -100.5 -99.7 -96.0 -94.4 MRC REFSENS -84.3 -91.1 -98.2 -93.5 -91.8 -93.3 -97.2 -97.2 3GPP REFSENS MSD -97.0 -96.5 [5.4] -97.0 [0.0] -93.7 [0.2] -93.0 [1.2] -93.0 [0.0] -97.0 [0.0] -97.0 [0.0] [12.7]
WF: Framework for specification Mainly consider the 1storder triple beat (TX22TX1) of 3rdorder non-linearity -> this is shown in the table as triple beat order 1. Detection -> ?????? ?????? < 1 ???????+????? Further check the 2ndorder triple beat (TX24TX1) of 5thorder non-linearity -> this would be shown in the table as triple beat order 2. Detection -> ?????? ?????? < 2 ???????+????? This may come into play for higher TX power for power class 2 capable bands Neglect the 3rdorder triple beat (TX26TX1) of 7thorder non-linearity. Detection -> ?????? ?????? < 3 ???????+????? Verify MSD test points including RB positions and consider following framework for specification. If FDD victim TX band allocation is fully allocated, then RB positions in table are chosen so that ULCA tone spacing is at the duplex offset Tone spacing and RB positions also chosen for least amount of back-off to meet emission requirements +???? 2 2 +???? 2 2 +???? 2 2 NR or E-UTRA Band / Channel bandwidth / NRB/ MSD UL Fc (MHz) BW (MHz) EN-DC Configuratio n EUTRA or NR band UL/DL UL LCRB DL Fc (MHz) MSD (dB) Duplex mode Triple beat order 1 N/A 3 1782.5 2555 2635 1912.5 2545 2595 912.5 4545 4645 5 25 1877.5 2555 2635 1992.5 2545 2595 957.5 4545 4645 [12.7] N/A FDD TDD DC_3A-n41C n41C [80] [80] 5 90 100 5 100 100 [1 (RBstart=88)] [1 (RBstart=128)] 25 1 (RBstart=150) 1 (RBstart=122) 25 1 (RBstart=212) 1 (RBstart=60) 25 [5.4] N/A FDD TDD 1 DC_25A- n41C n41C N/A 8 [0] N/A FDD TDD 1 DC_8A-n79C n79C N/A
References: [1] R4-2107627 Triple beat and 3ULCC MSD, Qualcomm Incorporated, R4#99-e [2] R4-2111016 MSD Due to NR Intra-band ULCA IMD within Inter-band Combinations, Skyworks, R4#99-e [3] R4-2105335 Way forward on analysis and framework of triple beat issue of 3CC UL with contiguous intra band UL CA , Qualcomm Inc., R4#98bis-e [4]
