Static TDD,
FDD
Normal CP
30 kHz subcarrier spacing
Bandwidths: 10, 20, 40, 80, 100MHz (273 Physical Resource Blocks)
Intermediate downlink and uplink frequencies to interface with IF equipment
Single antenna port (single beam)
Slot format: 14 OFDM symbols in UL or DL
Highly efficient 3GPP compliant LDPC encoder and decoder (BG1 and BG2 supported)
Highly efficient 3GPP compliant polar encoder and decoder
Encoder and decoder for short blocks
Support for UL transform precoding (SC-FDMA)

2.2 gNB PHY Layer

30KHz SCS for FR1 and 120KHz SCS for FR2
Generation of NR-PSS/NR-SSS
NR-PBCH supports multiple SSBs and flexible periodicity
Generation of NR-PDCCH (including generation of DCI, polar encoding, scrambling, modulation, RB mapping, etc)
- common search space
- user-specific search space
- DCI formats: 00, 10, 01 and 11
Generation of NR-PDSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
- PDSCH mapping type A and B
- DMRS configuration type 1 and 2
- Single and multiple DMRS symbols
- PTRS support
- Support for 1, 2 and 4 TX antennas
- Support for up to 2 layers (currently limited to DMRS configuration type 2)
NR-CSIRS Generation of sequence at PHY
NR-PUSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
- PUSCH mapping type A and B
- DMRS configuration type 1 and 2
- Single and multiple DMRS symbols
- PTRS support
- Support for 1 RX antenna
- Support for 1 layer
NR-PUCCH
- Format 0 (2 bits, for ACK/NACK and SR)
- Format 2 (up to 11 bits, mainly for CSI feedback)
NR-PRACH
- Formats 0,1,2,3, A1-A3, B1-B3
Highly efficient 3GPP compliant LDPC encoder and decoder (BG1 and BG2 are supported)
Highly efficient 3GPP compliant polar encoder and decoder
Encoder and decoder for short block

2.3 gNB Higher Layers

2.3.1 gNB MAC

MAC -> PHY configuration using NR FAPI P5 interface
MAC <-> PHY data interface using FAPI P7 interface for BCH PDU, DCI PDU, PDSCH PDU
Scheduler procedures for SIB1
Scheduler procedures for RA
- Contention free RA procedure
- Contention based RA procedure
Scheduler procedures for CSI-RS
MAC downlink scheduler
- phy-test scheduler (fixed allocation and usable also without UE)
- regular scheduler with dynamic allocation
MAC header generation (including timing advance)
ACK / NACK handling and HARQ procedures for downlink
MAC uplink scheduler
- phy-test scheduler (fixed allocation)
- regular scheduler with dynamic allocation
- HARQ procedures for uplink
MAC procedures to handle CSI measurement report
- evalution of RSRP report
- evaluation of CQI report
MAC scheduling of SR reception

2.3.2 gNB RLC

Send/Receive operations according to 38.322 Rel.16
- Segmentation and reassembly procedures
- RLC Acknowledged mode supporting PDU retransmissions
- RLC Unacknowledged mode
- DRBs and SRBs establishment/handling and association with RLC entities
- Timers implementation
- Interfaces with PDCP, MAC
- Interfaces with gtp-u (data Tx/Rx over F1-U at the DU)

2.3.3 gNB PDCP

Send/Receive operations according to 38.323 Rel.16
- Integrity protection and ciphering procedures
- Sequence number management, SDU dicard and in-order delivery
- Radio bearer establishment/handling and association with PDCP entities
- Interfaces with RRC, RLC
- Interfaces with gtp-u (data Tx/Rx over N3 and F1-U interfaces)

2.3.4 gNB RRC

NR RRC (38.331) Rel 16 messages using new asn1c
LTE RRC (36.331) also updated to Rel 15
Generation of CellGroupConfig (for eNB) and MIB
Generation of system information block 1 (SIB1)
Generation of system information block 2 (SIB2)
Application to read configuration file and program gNB RRC
RRC can configure PDCP, RLC, MAC
Interface with gtp-u (tunnel creation/handling for S1-U (NSA), N3 (SA) interfaces)
Integration of RRC messages and procedures supporting UE 5G SA connection
- RRCSetupRequest/RRCSetup/RRCSetupComplete
- RRC Uplink/Downlink Information transfer carrying NAS messages transparently
- RRC Reconfiguration/Reconfiguration complete
- Support for master cell group configuration
- Interface with NGAP for the interactions with the AMF
- Interface with F1AP for CU/DU split deployment option

2.3.5 gNB X2AP

Integration of X2AP messages and procedures for the exchanges with the eNB over X2 interface supporting the NSA setup according to 36.423 Rel. 15
- X2 setup with eNB
- Handling of SgNB Addition Request / Addition Request Acknowledge / Reconfiguration Complete

2.3.6 gNB NGAP

Integration of NGAP messages and procedures for the exchanges with the AMF over N2 interface according to 38.413 Rel. 15
- NGAP Setup request/response
- NGAP Initial UE message
- NGAP Initial context setup request/response
- NGAP Downlink/Uplink NAS transfer
- NGAP UE context release request/complete
- NGAP UE radio capability info indication
- NGAP PDU session resource setup request/response
Interface with RRC

2.3.7 gNB F1AP

Integration of F1AP messages and procedures for the control plane exchanges between the CU and DU entities according to 38.473 Rel. 16
- F1 Setup request/response
- F1 DL/UL RRC message transfer
- F1 Initial UL RRC message transfer
- F1 UE Context setup request/response
- F1 gNB CU configuration update
Interface with RRC
Interface with gtp-u (tunnel creation/handling for F1-U interface)

gNB GTP-U

New gtp-u implementation supporting both N3 and F1-U interfaces according to 29.281 Rel.15
- Interfaces with RRC, F1AP for tunnel creation
- Interfaces with PDCP and RLC for data send/receive at the CU and DU respectively (F1-U interface)

第3章 OpenAirInterface 5G-NR UE Feature Set

3.1 Overview

Supporting "noS1" mode (DL and UL):
- Creates TUN interface to PDCP to inject and receive user-place traffic
- No connection to the （LTE）core network
Supporting Standalone (SA) mode:
- UE can register with the 5G Core Network, establish a PDU Session and exchange user-plane traffic

3.2 NR UE PHY Layer

Initial synchronization
Time tracking based on PBCH DMRS
Frequency offset estimation
30KHz SCS for FR1 and 120 KHz SCS for FR2
Reception of NR-PSS/NR-SSS
NR-PBCH supports multiple SSBs and flexible periodicity
Reception of NR-PDCCH (including reception of DCI, polar decoding, de-scrambling, de-modulation, RB de-mapping, etc)
- common search space configured by MIB
- user-specific search space configured by RRC
- DCI formats: 00, 10, 01 and 11
Reception of NR-PDSCH (including Segmentation, LDPC decoding, rate de-matching, de-scrambling, de-modulation, RB de-mapping, etc).
- PDSCH mapping type A and B
- DMRS configuration type 1 and 2
- Single and multiple DMRS symbols
- PTRS support
- Support for 1, 2 and 4 RX antennas
- Support for up to 2 layers (currently limited to DMRS configuration type 2)
NR-PUSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
- PUSCH mapping type A and B
- DMRS configuration type 1 and 2
- Single and multiple DMRS symbols
- PTRS support
- Support for 1 TX antenna
- Support for 1 layer
NR-PUCCH
- Format 0 (2 bits for ACK/NACK and SR)
- Format 2 (up to 64 bits, mainly for CSI feedback)
- Format 1, 3 and 4 present but old code never dested (need restructuring before verification)
NR-PRACH
- Formats 0,1,2,3, A1-A3, B1-B3
NR-SRS
- Old code never dested (need restructuring before verification)
SS-RSRP
- RSRP measured on synchronization SSB (ok only for single SSB)
Highly efficient 3GPP compliant LDPC encoder and decoder (BG1 and BG2 are supported)
Highly efficient 3GPP compliant polar encoder and decoder
Encoder and decoder for short block

3.3 NR UE FAPI

MAC -> PHY configuration via UE FAPI P5 interface
Basic MAC to control PHY via UE FAPI P7 interface
PHY -> MAC indication (needs some improvement)

3.4 NR UE Higher Layers

3.4.1 UE MAC

Minimum system information (MSI)
- MIB processing
- Scheduling of system information block 1 (SIB1) reception
Random access procedure (needs improvement, there is still not a clear separation between MAC and PHY)
- Mapping SSBs to multiple ROs
- Scheduling of PRACH
- Processing of RAR
- Transmission and re-transmission of Msg3
- Msg4 and contention resolution
DCI processing
- format 10 (RA-RNTI, C-RNTI, SI-RNTI, TC-RNTI)
- format 00 (C-RNTI, TC-RNTI)
- format 11 (C-RNTI)
- format 01 (C-RNTI)
UCI processing
- ACK/NACK processing
- Triggering periodic SR
- CSI measurement reporting (SSB RSRP only)
DLSH scheduler
- Configuration of fapi PDU according to DCI
- HARQ procedures
ULSCH scheduler
- Configuration of fapi PDU according to DCI

3.4.2 UE RLC

Tx/Rx operations according to 38.322 Rel.16
- Segmentation and reassembly procedures
- RLC Acknowledged mode supporting PDU retransmissions
- RLC Unacknowledged mode
- DRBs and SRBs establishment and handling
- Timers implementation
- Interfaces with PDCP, MAC

3.4.3 UE PDCP

Tx/Rx operations according to 38.323 Rel.16
- Integrity protection and ciphering procedures
- Sequence number management, SDU dicard and in-order delivery
- Radio bearer establishment/handling and association with PDCP entities
- Interfaces with RRC, RLC

3.4.4 UE RRC

Integration of RRC messages and procedures supporting UE 5G SA connection according to 38.331 Rel.16
- RRCSetupRequest/RRCSetup/RRCSetupComplete
- RRC Uplink/Downlink Information transfer carrying NAS messages transparently
- RRC Reconfiguration/Reconfiguration complete
- Support for master cell group configuration
Interface with PDCP: configuration, DCCH and CCCH message handling
Interface with RLC and MAC for configuration

3.4.5 UE NAS

Transfer of NAS messages between the AMF and the UE supporting the UE registration with the core network and the PDU session establishment according to 24.501 Rel.16
- Identity Request/Response
- Authentication Request/Response
- Security Mode Command/Complete
- Registration Request/Accept/Complete
- PDU Session Establishment Request/Accept
- NAS configuration and basic interfacing with RRC

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