From 1947f4d60c3f688b40417c164db92e18755aecba Mon Sep 17 00:00:00 2001 From: Thomas Schlichter Date: Wed, 10 Sep 2025 14:41:17 +0200 Subject: [PATCH] remove the parameter --autonomous-ta from the UE command line and update RUNMODEM.md accordingly --- .../yaml_files/5g_rfsimulator_ntn_leo/docker-compose.yaml | 2 +- doc/RUNMODEM.md | 6 ++++-- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/ci-scripts/yaml_files/5g_rfsimulator_ntn_leo/docker-compose.yaml b/ci-scripts/yaml_files/5g_rfsimulator_ntn_leo/docker-compose.yaml index 4e209e09d1..3b5e7170ba 100644 --- a/ci-scripts/yaml_files/5g_rfsimulator_ntn_leo/docker-compose.yaml +++ b/ci-scripts/yaml_files/5g_rfsimulator_ntn_leo/docker-compose.yaml @@ -123,7 +123,7 @@ services: --rfsim --rfsimulator.prop_delay 20 --rfsimulator.options chanmod --rfsimulator.serveraddr 192.168.71.140 --time-sync-I 0.1 --ntn-initial-time-drift -46 - --autonomous-ta --initial-fo 57340 --cont-fo-comp 2 + --initial-fo 57340 --cont-fo-comp 2 --log_config.global_log_options level,nocolor,time --num-ul-actors 1 depends_on: diff --git a/doc/RUNMODEM.md b/doc/RUNMODEM.md index 6e46a361fe..57ec937470 100644 --- a/doc/RUNMODEM.md +++ b/doc/RUNMODEM.md @@ -356,7 +356,9 @@ sudo ./ran_build/build/nr-uesoftmodem -O ../targets/PROJECTS/GENERIC-NR-5GC/CONF For LEO satellite scenarios, the parameter `--ntn-initial-time-drift` must be provided via command line, as the UE needs this value to compensate for the time drift during initial sync, before SIB19 was received. This parameter provides the drift rate of the complete DL timing (incl. feeder link and service link) in µs/s. -Also, to perform an autonomous TA update based on the DL drift, the boolean parameter `--autonomous-ta` should be added in case of a LEO satellite scenario. + +To perform an autonomous TA update based on the DL drift, the boolean parameter `--autonomous-ta` can be added. +If that parameter is omitted, the TA is continuously computed based on the SIB19 information. For LEO satellite scenario we assume the LO to be very accurate and the main FO contribution comes from Doppler shift. Therefore, we use the command line parameter `--cont-fo-comp 2` to continuously compensate the DL Doppler and pre-compensate the UL Doppler. @@ -367,7 +369,7 @@ For other information on optional NR UE command line options, please refer [here So an example NR UE command for FDD, 5MHz BW, 15 kHz SCS, transparent LEO satellite 5G NR NTN is this: ``` cd cmake_targets -sudo ./ran_build/build/nr-uesoftmodem -O ../targets/PROJECTS/GENERIC-NR-5GC/CONF/ue.conf --band 254 -C 2488400000 --CO -873500000 -r 25 --numerology 0 --ssb 60 --rfsim --rfsimulator.prop_delay 20 --rfsimulator.options chanmod --time-sync-I 0.1 --ntn-initial-time-drift -46 --autonomous-ta --initial-fo 57340 --cont-fo-comp 2 +sudo ./ran_build/build/nr-uesoftmodem -O ../targets/PROJECTS/GENERIC-NR-5GC/CONF/ue.conf --band 254 -C 2488400000 --CO -873500000 -r 25 --numerology 0 --ssb 60 --rfsim --rfsimulator.prop_delay 20 --rfsimulator.options chanmod --time-sync-I 0.1 --ntn-initial-time-drift -46 --initial-fo 57340 --cont-fo-comp 2 ``` # Specific OAI modes