Problem about uplinklink sniffing

[zjgsuzjx]

Hello, when I was executing the uplink signal sniffing command: sudo ./src/LTESniffer -A 2 -W 2 -f 1850e6 -C -m 0 the following error occurred: Thu_Jul_13_10.48.23_2023. Creating Phy Creating 2 Worker threads Opening RF device with 2 RX antennas... Available RF device list: UHD Trying to open RF device 'UHD' [INFO] [UHD] linux; GNU C++ version 9.4.0; Boost_107100; UHD_3.15.0.HEAD-0-gaea0e2de [INFO] [LOGGING] Fastpath logging disabled at runtime. Opening USRP channels=2, args: type=x300,master_clock_rate=184.32e6 [INFO] [UHD RF] RF UHD Generic instance constructed [INFO] [X300] X300 initialization sequence... [INFO] [X300] Maximum frame size: 1472 bytes. [INFO] [X300] Radio 1x clock: 184.32 MHz [INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: 0xF1F0D00000000000) [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1301 MB/s) [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1316 MB/s) [INFO] [0/Radio_0] Initializing block control (NOC ID: 0x12AD100000000001) [INFO] [0/Radio_1] Initializing block control (NOC ID: 0x12AD100000000001) [INFO] [0/DDC_0] Initializing block control (NOC ID: 0xDDC0000000000000) [INFO] [0/DDC_1] Initializing block control (NOC ID: 0xDDC0000000000000) [INFO] [0/DUC_0] Initializing block control (NOC ID: 0xD0C0000000000000) [INFO] [0/DUC_1] Initializing block control (NOC ID: 0xD0C0000000000000) [INFO] [MULTI_USRP] 1) catch time transition at pps edge [INFO] [MULTI_USRP] 2) set times next pps (synchronously) RF device 'UHD' successfully opened Starting AGC thread... Tunning receiver to 1850.000 MHz Searching for cell... Found Cell_id: 0 FDD, CP: Normal , DetectRatio= 0% PSR=0.00, Power=-inf dBm *Found Cell_id: 436 FDD, CP: Normal , DetectRatio=100% PSR=6.71, Power=-7.8 dBm Found Cell_id: 62 TDD, CP: Normal , DetectRatio=100% PSR=2.18, Power=-21.5 dBm Decoding PBCH for cell 436 (N_id_2=1) Setting sampling rate 23.04 MHz /LTESniffer/src/src/LTESniffer_Core.cc:228: Could not set sampling rate [ERROR] [UHD RF] RuntimeError: Multiple sampling rates upstream of RX Terminator 0: RuntimeError: Node 0/DDC_1 specifies 1.92e+06, node 0/DDC_0 specifies 2.304e+07. terminate called without an active exception

[hdtuanss]

hi, could you modify your command to: sudo ./src/LTESniffer -A 2 -W 2 -f 1850e6 -u (uplink frequency) -C -m 1 ? it should be -m 1 instead of -m 0 for uplink. Also, it should have uplink frequency. Thanks

[zjgsuzjx]

I‘m sorry, it's my mistake. When I run the downlink sniffering, it works fine with "-A 1," but when I use "-A 2," it throws the above error. Can you please advise on how to resolve this?

[hdtuanss]

could you upgrade your UHD version to a version > 4.0.0 ? Thanks

[zjgsuzjx]

When I use version UHD 4.0.0, the following prompt appears and the program stops, but when I use UHD 3.15 with -A 1, it runs successfully.

Creating Phy Creating 2 Worker threads Opening RF device with 2 RX antennas... Available RF device list: UHD Trying to open RF device 'UHD' [INFO] [UHD] linux; GNU C++ version 9.4.0; Boost_107100; UHD_4.0.0.HEAD-0-g90ce6062 [INFO] [LOGGING] Fastpath logging disabled at runtime. Opening USRP channels=2, args: type=x300,master_clock_rate=184.32e6 [INFO] [UHD RF] RF UHD Generic instance constructed [INFO] [X300] X300 initialization sequence... [INFO] [X300] Maximum frame size: 1472 bytes. [INFO] [X300] Radio 1x clock: 184.32 MHz [WARNING] [UDP] The recv buffer could not be resized sufficiently. Target sock buff size: 24266666 bytes. Actual sock buff size: 212992 bytes. See the transport application notes on buffer resizing. Please run: sudo sysctl -w net.core.rmem_max=24266666 [WARNING] [UDP] The send buffer could not be resized sufficiently. Target sock buff size: 24266666 bytes. Actual sock buff size: 212992 bytes. See the transport application notes on buffer resizing. Please run: sudo sysctl -w net.core.wmem_max=24266666 [WARNING] [UDP] The current recv_buff_size of 212992 is less than the minimum recommended size of 816000 and may result in dropped packets on some NICs [WARNING] [UDP] The current send_buff_size of 212992 is less than the minimum recommended size of 307200 and may result in dropped packets on some NICs

[hdtuanss]

could you execute following commands?

sudo sysctl -w net.core.wmem_max=24266666
sudo sysctl -w net.core.rmem_max=24266666
sudo ifconfig (your-10Gb-card-interface-name) mtu 9000