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.