FR1 COEX
C-DReAM FR1 COEX template provides a 3GPP RAN4 is working on an NTN coexistence study in frequency bands around 2GHz. This involves producing system level simulations with regards to Terrestrial (TN) and Non-Terrestrial Network (NTN) co-existence within adjacent frequency bands. We have modified our fully dynamic system level simulator operating on a packet level resolution for the purpose. Template is implemented by the NTN simulator.
Essential pre-conditions
NTN satellite with 1 beam and 1-tier FR3 wrap-around (6 beams generating co-channel interference)
TN network with 7 macro sites with 3 sectors each (21 cells total)
ACIR region offset: enabled (13 dB)
10 UEs per TN cell area = 210 in total
50 NTN UEs on the edge of TN; Isolation distance of 2 * ISD in Urban scenarios
TN interference scaling enabled (in cases where TN UL is the aggressor)
Full buffer traffic
Configurable options
NTN orbit & TN scenario combination
LEO 600 & Urban (/scaled)
LEO 600 & Rural (/scaled)
LEO 1200 & Urban (/scaled)
LEO 1200 & Rural (/scaled)
GEO & Urban (/scaled)
GEO & Rural (/scaled)
GEO45 & Urban (/scaled)
GEO45 & Rural (/scaled)
Adjacent Channel Interference Ratio (ACIR)
Off
0, 10, 20, 30, 40 dB
RAN4 Templates
All the templates are identical to each other except on the Adjacent Channel Interference (ACI) configuration. Other channels do not interfere each others.
Scaling factor. The simulated TN network does not cover the whole beam but caused interference has been scaled up assuming there are TN cells on full NTN beam coverage area. Assuming 20% activity factor.
Eleveation angle: LEO600, LEO1200 and GEO have 90 degree satellite elevation angle. In GEO45 the elevation angle is 45 degrees.
RAN4-SC1
Aggressor TN DL. Victim NTN DL.
RAN4-SC2
Aggressor TN UL. Victim NTN UL. ACI scaling available.
RAN4-SC3
Aggressor NTN DL. Victim TN DL.
RAN4-SC4
Aggressor NTN UL. Victim TN UL.
RAN4-SC5
Aggressor NTN UL. Victim TN DL.
RAN4-SC6
Aggressor TN DL. Victim NTN UL. ACI scaling available.
Scenario aggressor/victim configurations.
Urban TN configuration with NTN users on outside ring.
In urban TN scenarios the NTN UE ring and TN outer edge isolation distance is 2 * ISD.
Rural TN configuration with NTN users on outside ring
In rural TN scenarios there is no isolation distance between NTN user ring and TN network edge
References
[1] R4-2120671, Simulation assumptions for NTN co-existence study, Samsung, CATT, 3GPP TSG-RAN WG4 Meeting # 101-e, November, 2021.
Essential pre-conditions
C-DReAM is a link budget / capacity level system simulator, i.e. we cannot observe e.g. packet-level statistics, such as delay or jitter.
Traffic is modeled by means of traffic demand in kbps, which is aimed to be offered to the user, either in uplink or downlink.
Focus is on user link (i.e. link between user terminals and satellite), in both uplink and downlink. The feeder link or ISLs are not considered (TBA)
Configurable NGSO satellite constellations, i.e. number of satellites, orbits, altitudes, etc, are configurable. Geostationary systems, terrestrial networks and hybrid TN/NTN networks are TBA.
Bessel (TR 38.821) based beam patterns either in quasi-earth-fixed (QEF) or earth-moving (EM) configurations. GRASP based input TBA.
Stationary user terminals. The terminals are positioned in randomized positions with certain configurable geographical limitations (e.g. continent and country). Moving terminals TBA.
Terminals can have either omnidirectional antenna or VSAT antenna, which is modeled by means of TR 38.811 Bessel model. Active antennas (antenna panel arrays) TBA.
5G NR-NTN waveforms (Table 1, 2 or 3) in both downlink and uplink. DVB-S2X/RCS2 TBA.
Simple fair reference resource management algorithm, i.e. scheduler. Note, the algorithm cannot be currently changed entirely by the user (only within the capabilities of current parameterization), but that requires further development in SimLab and/or C-DReAM simulator.
Configurable options
Common
General C-DReAM configuration options in https://docs.magistersimlab.com/NGSO.html