4 General

38.1083GPPNRRelease 17Satellite 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 38.181 [3].

The minimum requirements given in this specification make no allowance for measurement uncertainty. The test specifications TS 38.181 [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

Co-location requirements are specified at the conducted interface of the co-location reference antenna, the co-location reference antenna does not form part of the SAN under test but is a means to provide OTA power levels which are representative of a co-located system, further defined in clause 4.9. Transmitter units and receiver units may be combined into transceiver units. The transmitter/receiver units have the ability to transmit/receive parallel independent modulated symbol streams.

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	Operating band unwanted emission, OTA unwanted emissions	For n255 operation in US, Limits in FCC Title 47 apply.
6.6.5	Tx spurious emissions, OTA Tx spurious emissions	For n255 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
Satellite Access Network 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 Satellite Access Network 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.