NTN

RRC Parameters (NR)

RRC parameters for 5G NTN highlights the intricate configuration elements necessary for supporting advanced NTN functionalities in the 5G ecosystem. These parameters, defined within the 3GPP technical specifications, encompass essential elements such as NTN-specific configurations, reference locations, timing adjustments, and ephemeris information to facilitate satellite and high-altitude platform integration. The configuration sequences include fields for neighbor cell setup, synchronization validity, polarization, and orbital data, addressing the unique challenges of NTN environments like extended distances, Doppler shifts, and dynamic network topologies. Additionally, enhanced downlink and uplink configurations, HARQ feedback, and scheduling mechanisms ensure robust communication and efficient resource utilization, paving the way for seamless connectivity across terrestrial and non-terrestrial domains. These parameters collectively enable UEs to adapt to diverse operational scenarios, ensuring reliable and efficient communication in NTN-enabled 5G deployments.

Highlights

NTN Configuration: Provides the foundational parameters for configuring non-terrestrial networks (NTN). It includes synchronization validity to ensure time alignment between satellite and terrestrial systems, polarization settings (RHCP, LHCP, linear) for signal integrity, and ephemeris data to track satellite positions.
- ntn-Config-r17
Neighbor Cell Configurations: Specifies the setup for neighboring NTN cells, including parameters such as carrier frequencies and physical cell IDs, to ensure seamless handover and connectivity between cells in the NTN network.
- ntn-NeighCellConfigList-r17
Timing Adjustments: Introduces K_mac as a scheduling offset for aligning downlink and uplink frame timings. The TAInfo-r17 provides details for timing advance, accounting for the large distances inherent in NTN communication.
- TAInfo-r17
- n-TimingAdvanceOffset
Ephemeris Information: Supports tracking of satellite positions and movements, including orbital parameters and position-velocity data. This enables dynamic adjustment of communication paths and ensures reliable network operation.
- EphemerisInfo-r17
Distance Thresholds: Defines the maximum allowable distance for effective communication within NTN. This ensures the network can manage link budgets and latency effectively over vast distances.
- distanceThresh-r17
HARQ Feedback: Implements configurable downlink HARQ feedback mechanisms. This includes specific parameters to control and disable HARQ processes, supporting efficient error correction and retransmission handling.
- downlinkHARQ-FeedbackDisabled-r17
- nrofHARQ-ProcessesForPDSCH
- nrofHARQ-ProcessesForPDSCH-v1700
- DL-DataToUL-ACK-r17
- DL-DataToUL-ACK-v1700
- DL-DataToUL-ACK-DCI-1-2-r17
Adaptability for Diverse Scenarios: Ensures robust connectivity across various network domains. Includes parameters for NTN configuration, polarization, and ephemeris information to support diverse NTN deployment scenarios.
- ntn-Config-r17
- ntn-PolarizationDL-r17
- ntn-PolarizationUL-r17
- ephemerisInfo-r17
Advanced Resource Utilization: Facilitates efficient use of network resources through features like code block group transmission, ensuring optimal handling of transport blocks and resource allocation.
- PDSCH-CodeBlockGroupTransmission
- PDSCH-CodeBlockGroupTransmissionList-r16
- codeBlockGroupFlushIndicator

RRC Parameters

SIB19-r17 ::= SEQUENCE {

ntn-Config-r17 NTN-Config-r17 OPTIONAL, -- Need R

t-Service-r17 INTEGER (0..549755813887) OPTIONAL, -- Need R

referenceLocation-r17 ReferenceLocation-r17 OPTIONAL, -- Need R

distanceThresh-r17 INTEGER(0..65525) OPTIONAL, -- Need R

ntn-NeighCellConfigList-r17 NTN-NeighCellConfigList-r17 OPTIONAL, -- Need R

lateNonCriticalExtension OCTET STRING OPTIONAL,

...

}

NTN-NeighCellConfigList-r17 ::= SEQUENCE (SIZE(1..maxCellNTN-r17)) OF NTN-NeighCellConfig-r17

NTN-NeighCellConfig-r17 ::= SEQUENCE {

ntn-Config-r17 NTN-Config-r17 OPTIONAL, -- Need R

carrierFreq-r17 ARFCN-ValueNR OPTIONAL, -- Need R

physCellId-r17 PhysCellId OPTIONAL -- Need R

}

DownlinkConfigCommon ::= SEQUENCE {

frequencyInfoDL FrequencyInfoDL OPTIONAL, -- Cond InterFreqHOAndServCellAdd

initialDownlinkBWP BWP-DownlinkCommon OPTIONAL, -- Cond ServCellAdd

...,

[[

ntn-Config-r17 NTN-Config-r17 OPTIONAL, -- Need R

initialDownlinkBWP-RedCap-r17 BWP-DownlinkCommon OPTIONAL -- Need R

]]

}

NTN-Config-r17 ::= SEQUENCE {

epochTime-r17 EpochTime-r17 OPTIONAL, -- Need R

ntn-UlSyncValidityDuration-r17 ENUMERATED{ s5, s10, s15, s20, s25, s30, s35,

s40, s45, s50, s55, s60, s120, s180, s240} OPTIONAL, -- Need R

cellSpecificKoffset-r17 INTEGER(0..1023) OPTIONAL, -- Need R

kmac-r17 INTEGER(0..512) OPTIONAL, -- Need R

ta-Info-r17 TAInfo-r17 OPTIONAL, -- Need R

ntn-PolarizationDL-r17 ENUMERATED {rhcp,lhcp,linear} OPTIONAL, -- Need R

ntn-PolarizationUL-r17 ENUMERATED {rhcp,lhcp,linear} OPTIONAL, -- Need R

ephemerisInfo-r17 EphemerisInfo-r17 OPTIONAL, -- Need R

...

}

kmac :K_mac is a scheduling offset provided by network if downlink and uplink frame timing are not aligned at gNB. It is needed for UE action and assumption on downlink configuration indicated by a MAC-CE command in PDSCH [see TS 38.2xy]. If the field is absent UE assumes value 0. For the reference subcarrier spacing value for the unit of K_mac in FR1, a value of 15 kHz is used. The unit of K_mac is number of slots for a given subcarrier spacing.

EpochTime-r17 ::= SEQUENCE {

sfn-r17 INTEGER(0..1023),

subFrameNR-r17 INTEGER(0..9)

}

TAInfo-r17 ::= SEQUENCE {

ta-Common-r17 INTEGER(0..66485757),

ta-CommonDrift-r17 INTEGER(-261935..261935) OPTIONAL, -- Need R

ta-CommonDriftVariant-r17 INTEGER(0..29470) OPTIONAL -- Need R

}

EphemerisInfo-r17 ::= CHOICE {

positionVelocity-r17 PositionVelocity-r17,

orbital-r17 Orbital-r17

}

PositionVelocity-r17 ::= SEQUENCE {

positionX-r17 PositionStateVector-r17,

positionY-r17 PositionStateVector-r17,

positionZ-r17 PositionStateVector-r17,

velocityVX-r17 VelocityStateVector-r17,

velocityVY-r17 VelocityStateVector-r17,

velocityVZ-r17 VelocityStateVector-r17

}

Orbital-r17 ::= SEQUENCE {

semiMajorAxis-r17 INTEGER (0..8589934591),

eccentricityE-r17 INTEGER (0..524287),

periapsis-r17 INTEGER (0..16777215),

longitude-r17 INTEGER (0..2097151),

inclinationI-r17 INTEGER (-524288..524287),

meanAnomalyM-r17 INTEGER (0..16777215)

}

PositionStateVector-r17 ::= INTEGER (-3355432..33554431)

VelocityStateVector-r17 ::= INTEGER (-131072..131071)

PUCCH-Config ::= SEQUENCE {

...

secondTPCFieldDCI-1-1-r17 ENUMERATED {enabled} OPTIONAL, -- Need R

secondTPCFieldDCI-1-2-r17 ENUMERATED {enabled} OPTIONAL, -- Need R

dl-DataToUL-ACK-r17 SetupRelease { DL-DataToUL-ACK-r17 } OPTIONAL, -- Need M

dl-DataToUL-ACK-DCI-1-2-r17 SetupRelease { DL-DataToUL-ACK-DCI-1-2-r17} OPTIONAL,--Need M

ul-AccessConfigListDCI-1-1-r17 SetupRelease { UL-AccessConfigListDCI-1-1-r17 } OPTIONAL,

--Need M

...

schedulingRequestResourceToAddModListExt-v1700 SEQUENCE (SIZE (1..maxNrofSR-Resources))

OF SchedulingRequestResourceConfigExt-v1700

OPTIONAL, -- Need N

dmrs-BundlingPUCCH-Config-r17 SetupRelease { DMRS-BundlingPUCCH-Config-r17 }

OPTIONAL, -- Need M

dl-DataToUL-ACK-v1700 SetupRelease { DL-DataToUL-ACK-v1700 } OPTIONAL, -- Need M

dl-DataToUL-ACK-MulticastDCI-Format4-1-r17 SetupRelease

{ DL-DataToUL-ACK-MulticastDCI-Format4-1-r17 }

}

DL-DataToUL-ACK-r17 ::= SEQUENCE (SIZE (1..8)) OF INTEGER (-1..127)

DL-DataToUL-ACK-v1700 ::= SEQUENCE (SIZE (1..8)) OF INTEGER (16..31)

DL-DataToUL-ACK-DCI-1-2-r17 ::= SEQUENCE (SIZE (1..8)) OF INTEGER (0..127)

UL-AccessConfigListDCI-1-2-r17 ::= SEQUENCE (SIZE (1..16)) OF INTEGER (0..15)

NOTE : (Based on 38.331)

DL-DataToUL-ACK-r17, DL-DataToUL-ACK-v1700, DL-DataToUL-ACK-DCI-1-2-r17, UL-AccessConfigListDCI-1-2-r17

List of timing for given PDSCH to the DL ACK (see TS 38.213, clause 9.1.2). The field dl-DataToUL-ACK applies to DCI format 1_1 and the field dl-DataToUL-ACK-DCI-1-2 applies to DCI format 1_2 (see TS 38.212 clause 7.3.1 and TS 38.213 clause 9.2.3). The dl-DataToUL-ACK-v1700 is applicable for NTN and dl-DataToUL-ACKr17 is applicable for up to 71 GHz. If dl-DataToUL-ACK-r16 or dl DataToUL-ACK-r17 or dl-DataToUL-ACK-v1700 is signalled, UE shall ignore the dl-DataToUL-ACK (withoutsuffix). The value -1 corresponds to "inapplicable value" for the case where the A/N feedback timing is not explicitly included at the time of scheduling PDSCH. The fields dl-DataToUL-ACK-r17 and dl-DataToUL-ACK-DCI-1-2-r17 are only applicable for SCS of 480 kHz or 960 kHz.

ServingCellConfigCommon ::= SEQUENCE {

...

n-TimingAdvanceOffset ENUMERATED { n0, n25600, n39936 } OPTIONAL, -- Need S

...

ntn-Config-r17 NTN-Config-r17 OPTIONAL -- Need R

]],

[[

....,

[[

ra-ChannelAccess-r17 ENUMERATED {enabled} OPTIONAL -- Cond SharedSpectrum2

]]

}

n-TimingAdvanceOffset ; The N_TA-Offset to be applied for all uplink transmissions on this serving cell. If the field is absent, the UE applies the value defined for the duplex mode and frequency range of this serving cell. See TS 38.133-table 7.1.2-2.

PDSCH-ServingCellConfig ::= SEQUENCE {

codeBlockGroupTransmission SetupRelease { PDSCH-CodeBlockGroupTransmission }

OPTIONAL, -- Need M

xOverhead ENUMERATED { xOh6, xOh12, xOh18 } OPTIONAL, -- Need S

nrofHARQ-ProcessesForPDSCH ENUMERATED {n2, n4, n6, n10, n12, n16} OPTIONAL, -- Need S

pucch-Cell ServCellIndex OPTIONAL, -- Cond SCellAddOnly

...,

[[

maxMIMO-Layers INTEGER (1..8) OPTIONAL, -- Need M

processingType2Enabled BOOLEAN OPTIONAL -- Need M

]],

[[

pdsch-CodeBlockGroupTransmissionList-r16 SetupRelease {

PDSCH-CodeBlockGroupTransmissionList-r16 }

OPTIONAL -- Need M

]],

[[

downlinkHARQ-FeedbackDisabled-r17 SetupRelease { DownlinkHARQ-FeedbackDisabled-r17 }

OPTIONAL, -- Need M

nrofHARQ-ProcessesForPDSCH-v1700 ENUMERATED {n32} OPTIONAL -- Need R

]]

}

PDSCH-CodeBlockGroupTransmission ::= SEQUENCE {

maxCodeBlockGroupsPerTransportBlock ENUMERATED {n2, n4, n6, n8},

codeBlockGroupFlushIndicator BOOLEAN,

...

}

PDSCH-CodeBlockGroupTransmissionList-r16 ::= SEQUENCE (SIZE (1..2))

OF PDSCH-CodeBlockGroupTransmission

DownlinkHARQ-FeedbackDisabled-r17 ::= BIT STRING (SIZE (32))

downlinkHARQ-FeedbackDisabled ; Used to disable the DL HARQ feedback, sent in the uplink, per HARQ process ID. The first/leftmost bit corresponds to HARQ process ID 0, the next bit to HARQ process ID 1 and so on. Bits corresponding to HARQ process IDs that are not configured shall be ignored. The bit(s) set to one identify HARQ processes with disabled DL HARQ feedback and the bit(s) set to zero identify HARQ processes with enabled DL HARQ feedback.