From 4ddb2d3bac97973a8f289e9e5ba70b16ae12cda3 Mon Sep 17 00:00:00 2001 From: Thomas Schlichter Date: Tue, 7 May 2024 20:35:22 +0200 Subject: [PATCH] add section with NR UE NTN example to doc/RUNMODEM.md --- doc/RUNMODEM.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/doc/RUNMODEM.md b/doc/RUNMODEM.md index 753efdadaf..9ee9083e6d 100644 --- a/doc/RUNMODEM.md +++ b/doc/RUNMODEM.md @@ -188,6 +188,18 @@ cd cmake_targets sudo ./ran_build/build/nr-softmodem -O ../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band66.fr1.25PRB.usrpx300.conf --sa --rfsim --rfsimulator.prop_delay 238.74 ``` +### NR UE + +At UE side, there are two main parameters to cope with the large NTN propagation delay, cellSpecificKoffset and ta-Common. +`cellSpecificKoffset` is the same as for gNB and can be provided to the UE via command line parameter `--ntn-koffset`. +`ta-Common` is a common timong advance and can be provided to the UE via command line parameter `--ntn-ta-common` in milliseconds. + +So an example NR UE command for FDD, 5MHz BW, 15 kHz SCS, GEO satellite 5G NR NTN is this: +``` +cd cmake_targets +sudo ./ran_build/build/nr-uesoftmodem --band 66 -C 2152680000 --CO -400000000 -r 25 --numerology 0 --ssb 48 --sa --rfsim --rfsimulator.prop_delay 238.74 --ntn-koffset 478 --ntn-ta-common 477.48 +``` + # Specific OAI modes ## phy-test setup with OAI UE