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**Table of Contents**
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1. [OpenAirInterface eNB Feature Set](#openairinterface-enb-feature-set)
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1. [Functional Split Architecture](#functional-split-architecture)
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2. [OpenAirInterface Block Diagram](#openairinterface-block-diagram)
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2. [OpenAirInterface 4G-LTE eNB Feature Set](#openairinterface-4g-lte-enb-feature-set)
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1. [eNB PHY Layer](#enb-phy-layer)
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2. [eNB MAC Layer](#enb-mac-layer)
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3. [eNB RLC Layer](#enb-rlc-layer)
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@@ -9,29 +11,38 @@
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6. [eNB X2AP](#enb-x2ap)
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7. [eNB/MCE M2AP](#enbmce-m2ap)
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8. [MCE/MME M3AP](#mcemme-m3ap)
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9. [eNB Advanced Features](#enb-advanced-features)
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2. [OpenAirInterface Functional Split](#openairinterface-functional-split)
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3. [OpenAirInterface UE Feature Set](#openairinterface-ue-feature-set)
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3. [OpenAirInterface 4G-LTE UE Feature Set](#openairinterface-4g-lte-ue-feature-set)
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1. [LTE UE PHY Layer](#lte-ue-phy-layer)
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2. [LTE UE MAC Layer](#lte-ue-mac-layer)
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3. [LTE UE RLC Layer](#lte-ue-rlc-layer)
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4. [LTE UE PDCP Layer](#lte-ue-pdcp-layer)
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5. [LTE UE RRC Layer](#lte-ue-rrc-layer)
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4. [OpenAirInterface Functional Split](#openairinterface-functional-split)
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5. [OpenAirInterface 5G-NR Feature Set](#openairinterface-5g-nr-feature-set)
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4. [OpenAirInterface 5G-NR gNB Feature Set](#openairinterface-5g-nr-feature-set)
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1. [General Parameters](#general-parameters)
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2. [gNB Features](#gnb-features)
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1. [gNB Physical Layer](#gnb-phy-layer)
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2. [gNB Higher Layers](#gnb-higher-layers)
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3. [NR UE Features](#nr-ue-features)
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1. [NR UE Physical Layer](#nr-ue-phy-layer)
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2. [NR UE Higher Layers](#nr-ue-higher-layers)
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2. [gNB Physical Layer](#gnb-phy-layer)
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3. [gNB Higher Layers](#gnb-higher-layers)
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5. [OpenAirInterface 5G-NR UE Feature Set](#openairinterface-5g-nr-ue-feature-set)
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1. [UE Physical Layer](#ue-phy-layer)
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2. [UE Higher Layers](#ue-higher-layers)
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# OpenAirInterface Block diagram #
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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 eNB Feature Set #
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# OpenAirInterface 4G LTE eNB Feature Set #
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## eNB PHY Layer ##
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@@ -82,7 +93,11 @@ TDD UL: 20 MHz, 100 PRBS/ MCS **XX** | 3.0 Mbit/s | TM1: 4.21 Mbits/s
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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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- RRC interface for CCCH, DCCH, and DTCH
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- Proportional fair scheduler (round robin scheduler soon)
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- Proportional fair scheduler (round robin scheduler soon), with the following improvements:
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- Up to 30 users tested in the L2 simulator, CCE allocation in the preprocessor ; the scheduler was also simplified and made more modular
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- Adaptative UL-HARQ
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- Remove out-of-sync UEs
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- No use of the `first_rb` in the UL scheduler ; respects `vrb_map_UL` and `vrb_map` in the DL
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- DCI generation
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- HARQ Support
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- RA procedures and RNTI management
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@@ -123,7 +138,7 @@ The current PDCP layer is header compliant with **3GPP 36.323** Rel 10.1.0 and i
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## eNB RRC Layer ##
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The RRC layer is based on **3GPP 36.331** v14.3.0 and implements the following functions:
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The RRC layer is based on **3GPP 36.331** v15.6 and implements the following functions:
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- System Information broadcast (SIB 1, 2, 3, and 13)
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* SIB1: Up to 6 PLMN IDs broadcast
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@@ -150,6 +165,10 @@ The X2AP layer is based on **3GPP 36.423** v14.6.0 and implements the following
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- X2 timers (t_reloc_prep, tx2_reloc_overall)
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- Handover Cancel
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- X2-U interface implemented
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- EN-DC is implemented
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- X2AP : Handling of SgNB Addition Request / Addition Request Acknowledge / Reconfiguration Complete
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- RRC : Handling of RRC Connection Reconfiguration with 5G cell info, configuration of 5G-NR measurements
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- S1AP : Handling of E-RAB Modification Indication / Confirmation
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## eNB/MCE M2AP ##
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@@ -171,11 +190,8 @@ The M3AP layer is based on **3GPP 36.444** v14.0.1:
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- M3 Session Start Request
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- M3 Session Start Response
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## eNB Advanced Features ##
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**To be completed**
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# OpenAirInterface UE Feature Set #
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# OpenAirInterface 4G LTE UE Feature Set #
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## LTE UE PHY Layer ##
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@@ -230,17 +246,6 @@ The NAS layer is based on **3GPP 24.301** and implements the following functions
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- EMM attach/detach, authentication, tracking area update, and more
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- ESM default/dedicated bearer, PDN connectivity, and more
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# OpenAirInterface Functional Split #
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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 5G-NR Feature Set #
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@@ -258,49 +263,101 @@ The following features are valid for the gNB and the 5G-NR UE.
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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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## gNB Features ##
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### gNB PHY Layer ###
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## gNB PHY Layer ##
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* Generation of PSS/SSS/PBCH for multiple beams and
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* Generation of PDCCH for SIB1 (including generation of DCI, polar encoding, scrambling, modulation, RB mapping, etc)
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* 30KHz SCS for FR1 and 120 KHz 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 for SIB1 (including generation of DCI, polar encoding, scrambling, modulation, RB 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
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* Generation of PDSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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- Single symbol DMRS, dmrs-TypeA-Position Pos2, DMRS configuration type 1
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- PDSCH mapping type A
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- DCI formats: 00, 10 (01 and 11 **under integration**)
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* Generation of NR-PDSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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- Single symbol DMRS, DMRS-TypeA-Position Pos2, DMRS configuration type 1
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- PDSCH mapping type A
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* NR-CSI Generation of sequence at PHY (**under integration**)
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* NR-PUSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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* NR-PUCCH
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- Format 0 (ACK/NACK)
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- Format 0 (2 bits, mainly for ACK/NACK)
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- Format 2 (up to 64 bits, mainly for CSI feedback)
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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 higher Layers ###
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## gNB Higher Layers ##
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**gNB RRC**
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- NR RRC (38.331) Rel 15 messages using new asn1c
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- LTE RRC (36.331) also updated to Rel 15
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- Generation of MIB
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- Generation of CellGroupConfig (for eNB) and MIB
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- Application to read configuration file and program gNB RRC
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- RRC -> MAC configuration
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- MAC -> PHY configuration (using NR FAPI P5 interface)
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- FAPI P7 interface for BCH PDU, DCI PDU, PDSCH PDU
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- RRC can configure PDCP, RLC, MAC
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For more details see [this document](https://gitlab.eurecom.fr/oai/openairinterface5g/uploads/ba5368448d627743a28c770c29e8978e/OAI_Software_Architecture_for_Dual_Connectivity_in_E-UTRA_and_5G-NR_and_nFAPI_for_MAC-PHY_Interface.docx)
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**gNB X2AP**
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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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## NR UE Features ##
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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 for RA procedure at gNB
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- MAC downlink scheduler (fixed allocations)
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- MAC header generation (including timing advance)
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### NR UE PHY Layer ###
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- initial synchronization
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- Time tracking based on PDCCH DMRS
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- Frequency offset estimation
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- PBCH RX
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- PDCCH RX
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- PDSCH RX
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- including first version of dual stream receiver for PDSCH
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# OpenAirInterface 5G-NR UE Feature Set #
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**as of May 2020** only supporting "noS1" mode (DL):
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- Creates TUN interface to PDCP to inject and receive user-place traffic
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- Will only work with OAI gNB configured in the same mode
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## UE PHY Layer ##
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* Initial synchronization
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* Time tracking based on PBCH DMRS
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* Time tracking based on PBCH DMRS
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* Frequency offset estimation
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* PBCH RX
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* PDCCH RX
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* PDSCH RX, including a first version of dual stream receiver for PDSCH
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* 30KHz SCS for FR1 and 120 KHz 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 for SIB1 (including generation of DCI, polar encoding, scrambling, modulation, RB 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 **under integration**)
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* Generation of NR-PDSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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- Single symbol DMRS, DMRS-TypeA-Position Pos2, DMRS configuration type 1
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- PDSCH mapping type A
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* NR-CSI Generation of sequence at PHY (**under integration**)
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* NR-PUSCH (including Segmentation, LDPC encoding, rate matching, scrambling, modulation, RB mapping, etc).
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* NR-PUCCH
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- Format 0 (2 bits, mainly for ACK/NACK)
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- Format 2 (up to 64 bits, mainly for CSI feedback)
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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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## UE Higher Layers ##
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**gNB MAC**
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- Initial sync and MIB detection
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- MAC -> PHY configuration of PHY via UE FAPI P5 interface
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- Basic MAC to control PHY via UE FAPI P7 interface
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- Random access procedure
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**RLC**
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**PDCP**
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### NR UE higher Layers ###
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For more details see [this document](https://gitlab.eurecom.fr/oai/openairinterface5g/uploads/f7386f3a64806fd6b2ac1fc3d0252fff/UE_FAPI-like_interface.docx)
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[OAI wiki home](https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/home)
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