Content for TR 38.741 Word version: 18.2.0
1 Scope p. 6
The present document is a technical report for the work item of the NTN L-S-band.
2 References p. 6
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
3 Definitions of terms, symbols and abbreviations p. 6
3.1 Terms p. 6
For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Non-terrestrial networks:
Networks, or segments of networks, using an airborne or space-borne vehicle to embark a transmission equipment relay node or base station.
Satellite:
A space-borne vehicle embarking a bent pipe payload or a regenerative payload telecommunication transmitter, placed into Low-Earth Orbit (LEO), Medium-Earth Orbit (MEO), or Geostationary Earth Orbit (GEO).
Satellite Access Node:
see definition in TS 38.108.
UE transmission bandwidth configuration:
Set of resource blocks located within the UE channel bandwidth which may be used for transmitting or receiving by the UE.
3.2 Symbols p. 6
For the purposes of the present document, the following symbols apply:
ΔFGlobal
Granularity of the global frequency raster
ΔFRaster
Band dependent channel raster granularity
BWChannel
Channel bandwidth
BWinterferer
Bandwidth of the interferer
FDL_low
The lowest frequency of the downlink operating band
FDL_high
The highest frequency of the downlink operating band
FUL_low
The lowest frequency of the uplink operating band
FUL_high
The highest frequency of the uplink operating band
FInterferer
Frequency of the interferer
FInterferer (offset)
Frequency offset of the interferer (between the center frequency of the interferer and the carrier frequency of the carrier measured)
FIoffset
Frequency offset of the interferer (between the center frequency of the interferer and the closest edge of the carrier measured)
FOOB
The boundary between the NR out of band emission and spurious emission domains
FREF
RF reference frequency
FREF-Offs
Offset used for calculating FREF
Fuw (offset)
The frequency separation of the center frequency of the carrier closest to the interferer and the center frequency of the interferer
NRB
Transmission bandwidth configuration, expressed in units of resource blocks
NREF
NR Absolute Radio Frequency Channel Number (NR-ARFCN)
NREF-Offs
Offset used for calculating NREF
PInterferer
Modulated mean power of the interferer
Puw
Power of an unwanted DL signal
3.3 Abbreviations p. 7
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ACLR
Adjacent Channel Leakage Ratio
ACS
Adjacent Channel Selectivity
A-MPR
Additional Maximum Power Reduction
BW
Bandwidth
BWP
Bandwidth Part
CP-OFDM
Cyclic Prefix-OFDM
CW
Continuous Wave
DFT-s-OFDM
Discrete Fourier Transform-spread-OFDM
EIRP
Equivalent Isotropically Radiated Power
EVM
Error Vector Magnitude
FR
Frequency Range
FRC
Fixed Reference Channel
GEO
Geosynchronous Earth Orbit
GSCN
Global Synchronization Channel Number
IBB
In-band Blocking
ITU-R
Radiocommunication Sector of the International Telecommunication Union
LEO
Low Earth Orbiting
MOP
Maximum Output Power
MPR
Allowed maximum power reduction
MSD
Maximum Sensitivity Degradation
NR
New Radio
NR-ARFCN
NR Absolute Radio Frequency Channel Number
NS
Network Signalling
NTN
Non-Terrestrial Network
OOB
Out-of-band
PRB
Physical Resource Block
QAM
Quadrature Amplitude Modulation
RAN
Radio Access Network
RE
Resource Element
REFSENS
REFerence SENSitivity
RF
Radio Frequency
RMS
Root Mean Square (value)
RX
Receiver
SAN
Satellite Access Node
SC
Single Carrier
SCS
Subcarrier spacing
SEM
Spectrum Emission Mask
SNR
Signal-to-Noise Ratio
SS
Synchronization Symbol
TN
Terrestrial Network
TX
Transmitter
UE
User Equipment
4 Background p. 8
3GPP RAN#86 meeting approved the Rel-17 WI that aimed to enable support of the 5G/NR radio access technology for non-terrestrial satellite deployments. One of the WI objectives was to define and introduce the corresponding bands into the 3GPP specifications. The outcome of these discussions was two NTN bands - L-band and S-band - which were added as bands n255 and n256, respectively. At the same time there exist other satellite deployments, some of which use mixed L-/S-band pairing, whereupon the UL part is on the L-band, while the DL part is on the S-band. To limit the overall workload in Rel-17, it was decided by RAN WG4 to focus on L- and S-bands with the common understanding that other potential NTN bands should follow the "normal" process of submitting a new spectrum WI.
3GPP RAN#98 meeting agreed a new spectrum WI to add support for a new NTN band with the DL part on the S-band (2500MHz) and the UL part on the L-band (1600MHz).
