4 General
36.1083GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Release 18Satellite Access Node radio transmission and receptionTS
4.1 Relationship with other core specifications
The present document is a single-RAT specification for a SAN, covering RF characteristics and minimum performance requirements. Conducted and radiated core requirements are defined for the SAN architectures and SAN types defined in clause 4.3.
The applicability of each requirement is described in clause 4.6.
4.2 Relationship between minimum requirements and test requirements
Conformance to the present specification is demonstrated by fulfilling the test requirements specified in the conformance specification TS 36.181 [3].
The minimum requirements given in this specification make no allowance for measurement uncertainty. The test specifications TS 36.181 [3] define test tolerances. These test tolerances are individually calculated for each test. The test tolerances are used to relax the minimum requirements in this specification to create test requirements. For some requirements, including regulatory requirements, the test tolerance is set to zero.
The measurement results returned by the test system are compared – without any modification – against the test requirements as defined by the shared risk principle.
The shared risk principle is defined in recommendation ITU‑R M.1545 [4].
4.3 Requirement reference points
4.3.1 SAN type 1-H
For SAN type 1-H, the requirements are defined for two points of reference, signified by radiated requirements and conducted requirements.
Figure 4.3.1-1: Radiated and conducted reference points for SAN type 1-H
Radiated characteristics are defined over the air (OTA), where the radiated interface is referred to as the Radiated Interface Boundary (RIB). Radiated requirements are also referred to as OTA requirements. The (spatial) characteristics in which the OTA requirements apply are detailed for each requirement.
Conducted characteristics are defined at individual or groups of TAB connectors at the transceiver array boundary, which is the conducted interface between the transceiver unit array and the composite antenna.
The transceiver unit array is part of the composite transceiver functionality receiving and transmitting modulated signal to ensure radio links with users.
The satellite payload is composed by a transceiver unit array and a composite antenna array. The transceiver unit array contains an implementation specific number of transmitter units and an implementation specific number of receiver units.
The composite antenna contains a radio distribution network (RDN) and an antenna array. The RDN is a linear passive network which distributes the RF power generated by the transceiver unit array to the antenna array, and/or distributes the radio signals collected by the antenna array to the transceiver unit array, in an implementation specific way.
How a conducted requirement is applied to the transceiver array boundary is detailed in the respective requirement clause.
4.3.2 SAN type 1-O
For SAN type 1-O, the radiated characteristics are defined over the air (OTA), where the operating band specific radiated interface is referred to as the Radiated Interface Boundary (RIB). Radiated requirements are also referred to as OTA requirements. The (spatial) characteristics in which the OTA requirements apply are detailed for each requirement.
Figure 4.3.2-1: Radiated reference points for SAN type 1-O
4.4 Satellite Access Node classes
The requirements in this specification apply to Satellite Access Node unless otherwise stated. The associated deployment scenarios are exactly the same for SAN with and without connectors.
For SAN type 1-O and SAN type 1-H, two SAN classes (LEO and GEO) are currently defined in table 4.4-1.
Table 4.4-1 SAN classes
|
SAN class |
Satellite constellation |
|
GEO class |
GEO satellite |
|
LEO class |
LEO 600 km satellite LEO 1200 km satellite |
4.5 Regional requirements
Some requirements in the present document may only apply in certain regions either as optional requirements, or as mandatory requirements set by local and regional regulation. It is normally not stated in the 3GPP specifications under what exact circumstances the regional requirements apply, since this is defined by local or regional regulation.
Table 4.5-1 lists all requirements in the present specification that may be applied differently in different regions.
Table 4.5-1: List of regional requirements
|
Clause number |
Requirement |
Comments |
|---|---|---|
|
5.2 |
Operating bands |
Satellite operating bands may be applied regionally. |
|
6.6.4, 9.7.4 |
Operating band unwanted emission, OTA unwanted emissions |
For band 255 operation in US, Limits in FCC Title 47 apply. |
|
6.6.5 9.7.5 |
Tx spurious emissions, OTA Tx spurious emissions |
For band 255 operation in US, Limits in FCC Title 47 apply. |
4.6 Applicability of minimum requirements
In table 4.6-1, the requirement applicability for each requirement set is defined. For each requirement, the applicable requirement clause in the specification is identified. Requirements not included in a requirement set is marked not applicable (NA).
Table 4.6-1: Requirement set applicability
|
Requirement |
Requirement set |
|
|
SAN type 1-H |
SAN type 1-O |
|
|
SAN output power |
6.2 |
|
|
Output power dynamics |
6.3 |
|
|
Transmit ON/OFF power |
NA |
|
|
Frequency error |
6.5.1 |
|
|
Modulation quality |
6.5.2 |
|
|
Time alignment error |
NA |
|
|
Occupied bandwidth |
6.6.2 |
|
|
ACLR |
6.6.3 |
|
|
Operating band unwanted emissions |
6.6.4 |
|
|
Transmitter spurious emissions |
6.6.5 |
|
|
Transmitter intermodulation |
NA |
NA |
|
Reference sensitivity level |
7.2 |
|
|
Dynamic range |
7.3 |
|
|
ACS |
7.4.1 |
|
|
In-band blocking |
NA |
|
|
Out-of-band blocking |
7.5 |
|
|
Receiver spurious emissions |
NA |
|
|
Receiver intermodulation |
NA |
|
|
In-channel selectivity |
7.8 |
|
|
Performance requirements |
8 |
|
|
Radiated transmit power |
9.2 |
9.2 |
|
OTA SAN output power |
9.3 |
|
|
OTA output power dynamics |
9.4 |
|
|
OTA transmit ON/OFF power |
NA |
|
|
OTA frequency error |
9.6.1 |
|
|
OTA modulation quality |
9.6.2 |
|
|
OTA time alignment error |
NA |
|
|
OTA occupied bandwidth |
9.7.2 |
|
|
OTA ACLR |
NA |
9.7.3 |
|
OTA out-of-band emission |
9.7.4 |
|
|
OTA transmitter spurious emission |
9.7.5 |
|
|
OTA transmitter intermodulation |
NA |
|
|
OTA sensitivity |
10.2 |
10.2 |
|
OTA reference sensitivity level |
10.3 |
|
|
OTA dynamic range |
10.4 |
|
|
OTA ACS |
10.5.1 |
|
|
OTA in-band blocking |
NA |
|
|
OTA out-of-band blocking |
NA |
10.6 |
|
OTA receiver spurious emission |
NA |
|
|
OTA receiver intermodulation |
NA |
|
|
OTA in-channel selectivity |
10.9 |
|
|
Radiated performance requirements |
11 |
|
NOTE: Co-location requirements are not applicable to SAN.