622 lines
24 KiB
Markdown
622 lines
24 KiB
Markdown
**Table of Contents**
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[[_TOC_]]
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# Functional Split Architecture #
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- RCC: Radio-Cloud Center
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- RAU: Radio-Access Unit
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- RRU: Remote Radio-Unit
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- IF4.5 / IF5 : similar to IEEE P1914.1
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- FAPI (IF2) : specified by Small Cell Forum (open-nFAPI implementation)
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- IF1 : F1 in 3GPP Release 15
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# OpenAirInterface Block Diagram #
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# OpenAirInterface 5G-NR Feature Set #
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## General Parameters
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The following features are valid for the gNB and the 5G-NR UE.
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* Static TDD, FDD
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* Normal CP
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* Subcarrier spacings: 15 and 30kHz (FR1), 120kHz (FR2)
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* Bandwidths: 10, 20, 40, 60, 80, 100MHz
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* Intermediate downlink and uplink frequencies to interface with IF equipment
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* Procedures for 2-layer DL and UL MIMO
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* Slot format: 14 OFDM symbols in UL or DL
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* Highly efficient 3GPP compliant LDPC encoder and decoder (BG1 and BG2 supported)
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* Highly efficient 3GPP compliant polar encoder and decoder
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* Encoder and decoder for short blocks
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* Support for UL transform precoding (SC-FDMA)
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These modes of operation are supported:
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* "phy-test" mode (gNB, nrUE):
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- gNB and nrUE have hardcoded RNTI and radio configuration
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- gNB schedules the nrUE all the time, even if no UE connected
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- can be used for performance evaluation
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* "noS1" mode (DL and UL, gNB, nrUE):
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- Connection setup stops after RA; RRC configuration is exchanged through
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files
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- Creates TUN interface to PDCP to inject and receive user-place traffic
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- No connection to the core network
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* Standalone (SA) mode (gNB, nrUE):
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- UE can register with the 5G Core Network through the gNB, establish a PDU
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Session and exchange user-plane traffic
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- Reestablishment supported
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* Non-standalone (NSA) mode (gNB):
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- UE can use the gNB for user plane traffic while connected to the 4G eNB
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- is unstable (only one UE connection)
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## gNB PHY
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* 15kHz and 30kHz SCS for FR1 and 120kHz SCS for FR2
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* Generation of NR-PSS/NR-SSS
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* NR-PBCH supports multiple SSBs and flexible periodicity
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* Generation of NR-PDCCH (including generation of DCI, polar encoding, scrambling, modulation, RB mapping, etc)
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- common search space
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- user-specific search space
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- DCI formats: 00, 10, 01 and 11
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* Generation of NR-PDSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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- PDSCH mapping type A and B
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- DMRS configuration type 1 and 2
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- Single and multiple DMRS symbols
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- PTRS support
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- Support for up to 4 TX antennas
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- Support for up to 2 layers
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- Support for 256 QAM
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* NR-CSIRS Generation of sequence at PHY
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* NR-PUSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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- PUSCH mapping type A and B
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- DMRS configuration type 1 and 2
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- Single and multiple DMRS symbols
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- PTRS support
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- Support for up to 4 RX antennas
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- Support for up to 2 layers
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- Support for 256 QAM
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* NR-PUCCH
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- Format 0 (2 bits, for ACK/NACK and SR)
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- Format 2 (mainly for CSI feedback)
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* NR-SRS
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- SRS signal reception
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- Channel estimation (with T tracer real time monitoring)
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- Power noise estimation
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* NR-PRS
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- Rel16 Positioning reference signal(PRS) generation and modulation
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- Multiple PRS resources, one per beam is supported in FR2 TDD mode
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- FR1 and FR2 support with config file
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* NR-PRACH
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- Formats 0,1,2,3, A1-A3, B1-B3
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* Highly efficient 3GPP compliant LDPC encoder and decoder (BG1 and BG2 are supported)
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* Highly efficient 3GPP compliant polar encoder and decoder
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* Encoder and decoder for short block
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## gNB MAC
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- MAC -> PHY configuration using NR FAPI P5 interface
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- MAC <-> PHY data interface using FAPI P7 interface for BCH PDU, DCI PDU, PDSCH PDU
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- Scheduler procedures for SIB1
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- Scheduler procedures for RA
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- 4-Step RA
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- Contention Free RA procedure
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- Contention Based RA procedure
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- Msg3 can transfer uplink CCCH, DTCH or DCCH messages
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- CBRA can be performed using MAC CE for C-RNTI
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- Is not possible to use 2-Step RA and 4-Step RA at the same time
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- 2-Step RA
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- Contention Based RA procedure
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- MsgA can transfer uplink CCCH, DTCH or DCCH messages
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- CBRA can be performed using MAC CE for C-RNTI
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- Is not possible to use 2-Step RA and 4-Step RA at the same time
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- Fallback not supported
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- Scheduler procedures for CSI-RS
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- MAC downlink scheduler
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- phy-test scheduler (fixed allocation and usable also without UE)
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- regular scheduler with dynamic proportionally-fair allocation
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- MCS adaptation from HARQ BLER
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- MAC header generation (including timing advance)
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- ACK / NACK handling and HARQ procedures for downlink
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- MAC uplink scheduler
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- phy-test scheduler (fixed allocation)
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- regular scheduler with dynamic proportionally-fair allocation
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- HARQ procedures for uplink
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- Scheduler procedures for SRS reception
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- Periodic SRS reception
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- Channel rank computation up to 2x2 scenario
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- TPMI computation based on SRS up 4 antenna ports and 2 layers
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- MAC procedures to handle CSI measurement report
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- evalution of RSRP report
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- evaluation of CQI report
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- MAC scheduling of SR reception
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- Intra-frequency handover
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## gNB RLC
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- Send/Receive operations according to 38.322 Rel.16
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- Segmentation and reassembly procedures
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- RLC Acknowledged mode supporting PDU retransmissions
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- RLC Unacknowledged mode
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- DRBs and SRBs establishment/handling and association with RLC entities
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- Timers implementation
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- Interfaces with PDCP, MAC
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- Interfaces with gtp-u (data Tx/Rx over F1-U at the DU)
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## gNB PDCP
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- Send/Receive operations according to 38.323 Rel.16
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- Integrity protection and ciphering procedures
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- Sequence number management, SDU dicard and in-order delivery
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- Radio bearer establishment/handling and association with PDCP entities
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- Interfaces with RRC, RLC
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- Interfaces with gtp-u (data Tx/Rx over N3 and F1-U interfaces)
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## gNB SDAP
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- Send/Receive operations according to 37.324 Rel.15
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- Establishment/Handling of SDAP entities.
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- Transfer of User Plane Data
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- Mapping between a QoS flow and a DRB for both DL and UL
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- Marking QoS flow ID in both DL and UL packets
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- Reflective QoS flow to DRB mapping for UL SDAP data PDUs
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## gNB RRC
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- NR RRC (38.331) Rel 17 messages using new [asn1c](https://github.com/mouse07410/asn1c)
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- LTE RRC (36.331) also updated to Rel 15
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- Generation of MIB/SIB1 (received from DU)
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- RRC can configure PDCP, RLC, MAC
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- Interface with GTP-U (tunnel creation/handling for S1-U (NSA), N3 (SA), F1 interfaces)
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- Integration of RRC messages and procedures supporting UE 5G SA connection
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- RRCSetupRequest/RRCSetup/RRCSetupComplete
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- RRC Uplink/Downlink Information transfer carrying NAS messages transparently
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- RRC Reconfiguration/Reconfiguration complete
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- RRC Reestablishment/Reestablishment complete
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- Support for MasterCellGroup configuration (from DU)
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- Interface with NGAP for the interactions with the AMF
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- Interface with F1AP for CU/DU split deployment option
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- Periodic RRC measurements of serving cell (no A/B events)
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## gNB X2AP
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- 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
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- X2 setup with eNB
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- Handling of SgNB Addition Request/Addition Request Acknowledge/Reconfiguration Complete
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## gNB NGAP
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- Integration of NGAP messages and procedures for the exchanges with the AMF over N2 interface according to 38.413 Rel. 15
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- NGAP Setup request/response
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- NGAP Initial UE message
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- NGAP Initial context setup request/response
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- NGAP Downlink/Uplink NAS transfer
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- NGAP UE context release request/complete
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- NGAP UE radio capability info indication
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- NGAP PDU session resource setup request/response
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- Interface with RRC
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## gNB F1AP
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- Integration of F1AP messages and procedures for the control plane exchanges between the CU and DU entities according to 38.473 Rel. 16
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- F1 Interface Management:
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* F1 Setup request/response/failure
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- F1 RRC Message Transfer:
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* F1 Initial UL RRC Message Transfer
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* F1 DL RRC Message Transfer
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* F1 UL RRC Message Transfer
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- F1 UE Context Management:
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* F1 UE Context setup request/response
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* F1 UE Context modification request/response
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* F1 UE Context modification required
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* F1 UE Context release req/cmd/complete
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- F1 gNB CU configuration update
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- F1 Reset (handled at DU only, full reset only)
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- Interface with RRC
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- Interface with GTP-u (tunnel creation/handling for F1-U interface)
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- One CU(-CP) can handle multiple DUs
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- Support for intra-CU mobility (across DUs)
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## gNB E1AP
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- Integration of E1AP messages and procedures for exchange between CU-CP and CU-UP according to TS 38.463 Rel. 16
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- E1 Setup (gNB-CU-UP initiated)
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- E1 Setup Request
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- E1 Setup Response
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- E1 Setup Failure
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- E1 Bearer Context Setup (gNB-CU-CP initiated)
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- E1 Bearer Context Setup Request
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- E1 Bearer Context Setup Response
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- Bearer Context Modification (gNB-CU-CP initiated)
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- E1 Bearer Context Modification Request
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- E1 Bearer Context Modification Response
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- Interface with RRC and PDCP
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- One CU-CP can handle multiple CU-UPs
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## gNB GTP-U
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- New GTP-U implementation supporting both N3 and F1-U interfaces according to 29.281 Rel.15
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- Interfaces with RRC, F1AP for tunnel creation
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- Interfaces with PDCP and RLC for data send/receive at the CU and DU respectively (F1-U interface)
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- Interface with SDAP for data send/receive, capture of GTP-U Optional Header, GTP-U Extension Header and PDU Session Container.
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## Number of supported UEs
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* 16 by default (as defined in `MAX_MOBILES_PER_GNB`)
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* up to 64 if the configured bandwidth is sufficient (at leat 40 MHz)
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# OpenAirInterface 5G-NR UE Feature Set #
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## NR UE PHY Layer ##
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* Initial synchronization
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- non-blind synchronization (information required: carrier frequency, bandwidth, numerology)
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- option to search SSB inside the bandwidth available
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* Time tracking based on PBCH DMRS
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* Frequency offset estimation based on PSS and SSS
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* 15kHz and 30kHz SCS for FR1 and 120 kHz SCS for FR2
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* Reception of NR-PSS/NR-SSS
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* NR-PBCH supports multiple SSBs and flexible periodicity
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- RSRP measurement for the strongest SSB
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* Reception of NR-PDCCH (including reception of DCI, polar decoding, de-scrambling, de-modulation, RB de-mapping, etc)
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- common search space configured by MIB
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- user-specific search space configured by RRC
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- DCI formats: 00, 10, 01 and 11
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* Reception of NR-PDSCH (including Segmentation, LDPC decoding, rate de-matching, de-scrambling, de-modulation, RB de-mapping, etc).
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- PDSCH mapping type A and B
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- DMRS configuration type 1 and 2
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- Single and multiple DMRS symbols
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- PTRS support
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- Support for 256 QAM
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- Support for 1, 2 and 4 RX antennas
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- Support for up to 2 layers (currently limited to DMRS configuration type 2)
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* Measurements based on NR-CSIRS
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- RSRP measurements
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- RI, PMI and CQI computation
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- Support for up to 4 RX antennas
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- Support for up to 2 layers
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* NR-PUSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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- PUSCH mapping type A and B
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- DMRS configuration type 1 and 2
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- Single and multiple DMRS symbols
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- PTRS support
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- Support for 256 QAM
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- Support for up to 2 TX antenna
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- Support for up to 2 layers
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* NR-PUCCH
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- Format 0 (2 bits for ACK/NACK and SR)
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- Format 2 (mainly for CSI feedback)
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- Format 1 (limited testing)
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- Format 3 and 4 present but old code never tested (need restructuring before verification)
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* NR-SRS
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- Generation of sequence at PHY
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- SRS signal transmission
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* NR-PRS
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- PRS based Channel estimation with T tracer dumps
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- Time of arrival(ToA) estimation based on channel impulse response(CIR)
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- Finer ToA estimation by 16x oversampled IDFT for CIR
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- Support for multiple gNB reception with gNBs synced via GPSDO
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* NR-PRACH
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- Formats 0,1,2,3, A1-A3, B1-B3
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* Highly efficient 3GPP compliant LDPC encoder and decoder (BG1 and BG2 are supported)
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* Highly efficient 3GPP compliant polar encoder and decoder
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* Encoder and decoder for short block
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## NR UE FAPI ##
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* MAC -> PHY configuration via UE FAPI P5 interface
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* Basic MAC to control PHY via UE FAPI P7 interface
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* PHY -> MAC indication
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## NR UE Higher Layers ##
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## UE MAC
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* Minimum system information (MSI)
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- MIB processing
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- Scheduling of system information block 1 (SIB1) reception
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* Random access procedure (needs improvement, there is still not a clear separation between MAC and PHY)
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- Mapping SSBs to multiple ROs
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- Scheduling of PRACH
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- 4-Step RA
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- Processing of RAR
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- Transmission and re-transmission of Msg3
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- Msg4 and contention resolution
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- 2-Step RA
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- Transmission of MsgA-PUSCH
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- Reception of MsgB
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- Processing of SuccessRAR
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- Fallback not supported
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* DCI processing
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- format 10 (RA-RNTI, C-RNTI, SI-RNTI, TC-RNTI)
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- format 00 (C-RNTI, TC-RNTI)
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- format 11 (C-RNTI)
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- format 01 (C-RNTI)
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* UCI processing
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- ACK/NACK processing
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- Scheduling request procedures
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- CSI measurement reporting (periodic and aperiodic)
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* DLSCH scheduler
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- Configuration of fapi PDU according to DCI
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- HARQ procedures
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* ULSCH scheduler
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- Configuration of fapi PDU according to DCI
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- Buffer status reporting procedures
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- Logical channel prioritization of 'data from any logical channel'
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- UCI on PUSCH
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* NR-CSIRS scheduler
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- Scheduling of NR-CSIRS reception
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- Fill UCI for CSI measurement reporting
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* Scheduler procedures for SRS transmission
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- Periodic and aperiodic SRS transmission
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* Bandwidth part (BWP) operation
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- Operation in configured dedicated BWP through RRCSetup or RRCReconfiguration
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## UE RLC
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* Tx/Rx operations according to 38.322 Rel.16
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- Segmentation and reassembly procedures
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- RLC Acknowledged mode supporting PDU retransmissions
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- RLC Unacknowledged mode
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- DRBs and SRBs establishment and handling
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- Timers implementation
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- Interfaces with PDCP, MAC
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## UE PDCP
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* Tx/Rx operations according to 38.323 Rel.16
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- Integrity protection and ciphering procedures
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- Sequence number management, SDU dicard and in-order delivery
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- Radio bearer establishment/handling and association with PDCP entities
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- Interfaces with RRC, RLC
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## UE SDAP
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* Tx/Rx operations operations according to 37.324 Rel.15
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- Establishment/Handling of SDAP entities.
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- Transfer of User Plane Data
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- Reflective Mapping
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- RRC Signaling Mapping
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## UE RRC
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* Integration of RRC messages and procedures supporting UE 5G SA connection according to 38.331 Rel.16
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- RRCSetupRequest/RRCSetup/RRCSetupComplete
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- RRC Uplink/Downlink Information transfer carrying NAS messages transparently
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- RRC Reconfiguration/Reconfiguration complete
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- RRCReestablishmentRequest/RRC Reestablishment/Reestablishment complete
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- Support for master cell group configuration
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- Reception of UECapabilityEnquiry, encoding and transmission of UECapability
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* Interface with PDCP: configuration, DCCH and CCCH message handling
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* Interface with RLC and MAC for configuration
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## UE NAS
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* 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
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- Identity Request/Response
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- Authentication Request/Response
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- Security Mode Command/Complete
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- Registration Request/Accept/Complete
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- PDU Session Establishment Request/Accept
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- NAS configuration and basic interfacing with RRC
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# OpenAirInterface 4G LTE eNB Feature Set #
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## eNB PHY Layer ##
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The Physical layer implements **3GPP 36.211**, **36.212**, **36.213** and provides the following features:
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- LTE release 8.6 compliant, and implements a subset of release 10
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- FDD and TDD configurations: 1 (experimental) and 3
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- Bandwidth: 5, 10, and 20 MHz
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- Transmission modes: 1, 2 (stable), 3, 4, 5, 6, 7 (experimental)
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- Max number of antennas: 2
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- CQI/PMI reporting: aperiodic, feedback mode 3 - 0 and 3 - 1
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- PRACH preamble format 0
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- Downlink (DL) channels are supported: PSS, SSS, PBCH, PCFICH, PHICH, PDCCH, PDSCH, PMCH, MPDCCH
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- Uplink (UL) channels are supported: PRACH, PUSCH, PUCCH (format 1/1a/1b), SRS, DRS
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- HARQ support (UL and DL)
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- Highly optimized base band processing (including turbo decoder)
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- Multi-RRU support: over the air synchro b/ multi RRU in TDD mode
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- Support for CE-modeA for LTE-M. Limited support for repeatition, single-LTE-M connection, legacy-LTE UE attach is disabled.
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### Performances ###
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**Transmission Mode, Bandwidth** | **Expected Throughput** | **Measured Throughput** | **Measurement Conditions**
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-------------------------------- | ----------------------- | ------------------------| ----------------:
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FDD DL: 5 MHz, 25 PRBS/ MCS 28 | 16 - 17 Mbit/s | TM1: 17.0 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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FDD DL: 10 MHz, 50 PRBS/ MCS 28 | 34 - 35 Mbit/s | TM1: 34.0 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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FDD DL: 20 MHz, 100 PRBS/ MCS 28 | 70 Mbit/s | TM1: 69.9 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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FDD UL: 5 MHz, 25 PRBS/ MCS 20 | 9 Mbit/s | TM1: 8.28 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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FDD UL: 10 MHz, 50 PRBS/ MCS 20 | 17 Mbit/s | TM1: 18.3 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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FDD UL: 20 MHz, 100 PRBS/ MCS 20 | 35 Mbit/s | TM1: 18.6 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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TDD DL: 5 MHz, 25 PRBS/ MCS **XX** | 6.5 Mbit/s | TM1: 6.71 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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TDD DL: 10 MHz, 50 PRBS/ MCS **XX** | 13.5 Mbit/s | TM1: 13.6 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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TDD DL: 20 MHz, 100 PRBS/ MCS **XX** | 28.0 Mbit/s | TM1: 27.2 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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TDD UL: 5 MHz, 25 PRBS/ MCS **XX** | 2.0 Mbit/s | TM1: 3.31 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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TDD UL: 10 MHz, 50 PRBS/ MCS **XX** | 2.0 Mbit/s | TM1: 7.25 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
|
|
TDD UL: 20 MHz, 100 PRBS/ MCS **XX** | 3.0 Mbit/s | TM1: 4.21 Mbits/s | COTS-UE Cat 4 (150/50 Mbps)
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|
|
|
### Number of supported UEs ###
|
|
|
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* 16 by default
|
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* up to 256 when compiling with dedicated compile flag
|
|
* was tested with 40 COTS-UE
|
|
|
|
## eNB MAC Layer ##
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The MAC layer implements a subset of the **3GPP 36.321** release v8.6 in support of BCH, DLSCH, RACH, and ULSCH channels.
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|
|
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- RRC interface for CCCH, DCCH, and DTCH
|
|
- Proportional fair scheduler (round robin scheduler soon), with the following improvements:
|
|
- Up to 30 users tested in the L2 simulator, CCE allocation in the preprocessor ; the scheduler was also simplified and made more modular
|
|
- Adaptative UL-HARQ
|
|
- Remove out-of-sync UEs
|
|
- No use of the `first_rb` in the UL scheduler ; respects `vrb_map_UL` and `vrb_map` in the DL
|
|
- DCI generation
|
|
- HARQ Support
|
|
- RA procedures and RNTI management
|
|
- RLC interface (AM, UM)
|
|
- UL power control
|
|
- Link adaptation
|
|
- Connected DRX (CDRX) support for FDD LTE UE. Compatible with R13 from 3GPP. Support for Cat-M1 UE comming soon.
|
|
|
|
## eNB RLC Layer ##
|
|
|
|
The RLC layer implements a full specification of the 3GPP 36.322 release v9.3.
|
|
|
|
- RLC TM (mainly used for BCCH and CCCH)
|
|
* Neither segment nor concatenate RLC SDUs
|
|
* Do not include a RLC header in the RLC PDU
|
|
* Delivery of received RLC PDUs to upper layers
|
|
- RLC UM (mainly used for DTCH)
|
|
* Segment or concatenate RLC SDUs according to the TB size selected by MAC
|
|
* Include a RLC header in the RLC PDU
|
|
* Duplication detection
|
|
* PDU reordering and reassembly
|
|
- RLC AM, compatible with 9.3
|
|
* Segmentation, re-segmentation, concatenation, and reassembly
|
|
* Padding
|
|
* Data transfer to the user
|
|
* RLC PDU retransmission in support of error control and correction
|
|
* Generation of data/control PDUs
|
|
|
|
## eNB PDCP Layer ##
|
|
|
|
The current PDCP layer is header compliant with **3GPP 36.323** Rel 10.1.0 and implements the following functions:
|
|
|
|
- User and control data transfer
|
|
- Sequence number management
|
|
- RB association with PDCP entity
|
|
- PDCP entity association with one or two RLC entities
|
|
- Integrity check and encryption using the AES and Snow3G algorithms
|
|
|
|
## eNB RRC Layer ##
|
|
|
|
The RRC layer is based on **3GPP 36.331** v15.6 and implements the following functions:
|
|
|
|
- System Information broadcast (SIB 1, 2, 3, and 13)
|
|
* SIB1: Up to 6 PLMN IDs broadcast
|
|
- RRC connection establishment
|
|
- RRC connection reconfiguration (addition and removal of radio bearers, connection release)
|
|
- RRC connection release
|
|
- RRC connection re-establishment
|
|
- Inter-frequency measurement collection and reporting (experimental)
|
|
- eMBMS for multicast and broadcast (experimental)
|
|
- Handover (experimental)
|
|
- Paging (soon)
|
|
- RRC inactivity timer (release of UE after a period of data inactivity)
|
|
|
|
## eNB X2AP ##
|
|
|
|
The X2AP layer is based on **3GPP 36.423** v14.6.0 and implements the following functions:
|
|
|
|
- X2 Setup Request
|
|
- X2 Setup Response
|
|
- X2 Setup Failure
|
|
- Handover Request
|
|
- Handover Request Acknowledge
|
|
- UE Context Release
|
|
- X2 timers (t_reloc_prep, tx2_reloc_overall)
|
|
- Handover Cancel
|
|
- X2-U interface implemented
|
|
- EN-DC is implemented
|
|
- X2AP : Handling of SgNB Addition Request / Addition Request Acknowledge / Reconfiguration Complete
|
|
- RRC : Handling of RRC Connection Reconfiguration with 5G cell info, configuration of 5G-NR measurements
|
|
- S1AP : Handling of E-RAB Modification Indication / Confirmation
|
|
|
|
## eNB/MCE M2AP ##
|
|
|
|
The M2AP layer is based on **3GPP 36.443** v14.0.1:
|
|
- M2 Setup Request
|
|
- M2 Setup Response
|
|
- M2 Setup Failure
|
|
- M2 Scheduling Information
|
|
- M2 Scheduling Information Response
|
|
- M2 Session Start Request
|
|
- M2 Session Start Response
|
|
|
|
## MCE/MME M3AP ##
|
|
|
|
The M3AP layer is based on **3GPP 36.444** v14.0.1:
|
|
- M3 Setup Request
|
|
- M3 Setup Response
|
|
- M3 Setup Failure
|
|
- M3 Session Start Request
|
|
- M3 Session Start Response
|
|
|
|
|
|
# OpenAirInterface 4G LTE UE Feature Set #
|
|
|
|
## LTE UE PHY Layer ##
|
|
|
|
The Physical layer implements **3GPP 36.211**, **36.212**, **36.213** and provides the following features:
|
|
|
|
- LTE release 8.6 compliant, and implements a subset of release 10
|
|
- FDD and TDD configurations: 1 (experimental) and 3
|
|
- Bandwidth: 5, 10, and 20 MHz
|
|
- Transmission modes: 1, 2 (stable)
|
|
- Max number of antennas: 2
|
|
- CQI/PMI reporting: aperiodic, feedback mode 3 - 0 and 3 - 1
|
|
- PRACH preamble format 0
|
|
- All downlink (DL) channels are supported: PSS, SSS, PBCH, PCFICH, PHICH, PDCCH, PDSCH, PMCH
|
|
- All uplink (UL) channels are supported: PRACH, PUSCH, PUCCH (format 1/1a/1b), SRS, DRS
|
|
- LTE MBMS-dedicated cell (feMBMS) procedures subset for LTE release 14 (experimental)
|
|
- LTE non-MBSFN subframe (feMBMS) Carrier Adquistion Subframe-CAS procedures (PSS/SSS/PBCH/PDSH) (experimental)
|
|
- LTE MBSFN MBSFN subframe channel (feMBMS): PMCH (CS@1.25KHz) (channel estimation for 25MHz bandwidth) (experimental)
|
|
|
|
## LTE UE MAC Layer ##
|
|
|
|
The MAC layer implements a subset of the **3GPP 36.321** release v8.6 in support of BCH, DLSCH, RACH, and ULSCH channels.
|
|
|
|
- RRC interface for CCCH, DCCH, and DTCH
|
|
- HARQ Support
|
|
- RA procedures and RNTI management
|
|
- RLC interface (AM, UM)
|
|
- UL power control
|
|
- Link adaptation
|
|
- MBMS-dedicated cell (feMBMS) RRC interface for BCCH
|
|
- eMBMS and MBMS-dedicated cell (feMBMS) RRC interface for MCCH, MTCH
|
|
|
|
## LTE UE RLC Layer ##
|
|
|
|
The RLC layer implements a full specification of the 3GPP 36.322 release v9.3.
|
|
|
|
## LTE UE PDCP Layer ##
|
|
|
|
The current PDCP layer is header compliant with **3GPP 36.323** Rel 10.1.0.
|
|
|
|
## LTE UE RRC Layer ##
|
|
|
|
The RRC layer is based on **3GPP 36.331** v14.3.0 and implements the following functions:
|
|
|
|
- System Information decoding
|
|
- RRC connection establishment
|
|
- MBMS-dedicated cell (feMBMS) SI-MBMS/SIB1-MBMS management
|
|
|
|
## LTE UE NAS Layer ##
|
|
|
|
The NAS layer is based on **3GPP 24.301** and implements the following functions:
|
|
|
|
- EMM attach/detach, authentication, tracking area update, and more
|
|
- ESM default/dedicated bearer, PDN connectivity, and more
|
|
|
|
|
|
[OAI wiki home](https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/home)
|
|
|
|
[OAI softmodem build procedure](BUILD.md)
|
|
|
|
[Running the OAI softmodem ](RUNMODEM.md)
|