369 lines
14 KiB
Markdown
369 lines
14 KiB
Markdown
**Table of Contents**
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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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4. [eNB PDCP Layer](#enb-pdcp-layer)
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5. [eNB RRC Layer](#enb-rrc-layer)
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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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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 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 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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# 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 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)
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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
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* was tested with 40 COTS-UE
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## 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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- RRC interface for CCCH, DCCH, and DTCH
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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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- RLC interface (AM, UM)
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- UL power control
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- Link adaptation
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- Connected DRX (CDRX) support for FDD LTE UE. Compatible with R13 from 3GPP. Support for Cat-M1 UE comming soon.
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## eNB RLC Layer ##
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The RLC layer implements a full specification of the 3GPP 36.322 release v9.3.
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- RLC TM (mainly used for BCCH and CCCH)
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* Neither segment nor concatenate RLC SDUs
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* Do not include a RLC header in the RLC PDU
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* Delivery of received RLC PDUs to upper layers
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- RLC UM (mainly used for DTCH)
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* Segment or concatenate RLC SDUs according to the TB size selected by MAC
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* Include a RLC header in the RLC PDU
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* Duplication detection
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* PDU reordering and reassembly
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- RLC AM, compatible with 9.3
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* Segmentation, re-segmentation, concatenation, and reassembly
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* Padding
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* Data transfer to the user
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* RLC PDU retransmission in support of error control and correction
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* Generation of data/control PDUs
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## eNB PDCP Layer ##
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The current PDCP layer is header compliant with **3GPP 36.323** Rel 10.1.0 and implements the following functions:
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- User and control data transfer
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- Sequence number management
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- RB association with PDCP entity
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- PDCP entity association with one or two RLC entities
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- Integrity check and encryption using the AES and Snow3G algorithms
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## eNB RRC Layer ##
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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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- RRC connection establishment
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- RRC connection reconfiguration (addition and removal of radio bearers, connection release)
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- RRC connection release
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- RRC connection re-establishment
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- Inter-frequency measurement collection and reporting (experimental)
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- eMBMS for multicast and broadcast (experimental)
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- Handover (experimental)
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- Paging (soon)
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- RRC inactivity timer (release of UE after a period of data inactivity)
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## eNB X2AP ##
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The X2AP layer is based on **3GPP 36.423** v14.6.0 and implements the following functions:
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- X2 Setup Request
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- X2 Setup Response
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- X2 Setup Failure
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- Handover Request
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- Handover Request Acknowledge
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- UE Context Release
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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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The M2AP layer is based on **3GPP 36.443** v14.0.1:
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- M2 Setup Request
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- M2 Setup Response
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- M2 Setup Failure
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- M2 Scheduling Information
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- M2 Scheduling Information Response
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- M2 Session Start Request
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- M2 Session Start Response
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## MCE/MME M3AP ##
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The M3AP layer is based on **3GPP 36.444** v14.0.1:
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- M3 Setup Request
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- M3 Setup Response
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- M3 Setup Failure
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- M3 Session Start Request
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- M3 Session Start Response
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# OpenAirInterface 4G LTE UE Feature Set #
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## LTE UE 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)
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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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- All downlink (DL) channels are supported: PSS, SSS, PBCH, PCFICH, PHICH, PDCCH, PDSCH, PMCH
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- All uplink (UL) channels are supported: PRACH, PUSCH, PUCCH (format 1/1a/1b), SRS, DRS
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- LTE MBMS-dedicated cell (feMBMS) procedures subset for LTE release 14 (experimental)
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- LTE non-MBSFN subframe (feMBMS) Carrier Adquistion Subframe-CAS procedures (PSS/SSS/PBCH/PDSH) (experimental)
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- LTE MBSFN MBSFN subframe channel (feMBMS): PMCH (CS@1.25KHz) (channel estimation for 25MHz bandwidth) (experimental)
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## LTE UE 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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- RRC interface for CCCH, DCCH, and DTCH
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- HARQ Support
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- RA procedures and RNTI management
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- RLC interface (AM, UM)
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- UL power control
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- Link adaptation
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- MBMS-dedicated cell (feMBMS) RRC interface for BCCH
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- eMBMS and MBMS-dedicated cell (feMBMS) RRC interface for MCCH, MTCH
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## LTE UE RLC Layer ##
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The RLC layer implements a full specification of the 3GPP 36.322 release v9.3.
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## LTE UE PDCP Layer ##
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The current PDCP layer is header compliant with **3GPP 36.323** Rel 10.1.0.
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## LTE UE 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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- System Information decoding
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- RRC connection establishment
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- MBMS-dedicated cell (feMBMS) SI-MBMS/SIB1-MBMS management
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## LTE UE NAS Layer ##
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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 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,
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* Normal CP
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* 30 kHz subcarrier spacing
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* Bandwidths up to 80MHz (217 Physical Resource Blocks)
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* Single antenna port (single beam)
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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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## gNB PHY Layer ##
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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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## 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 CellGroupConfig (for eNB) and MIB
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- Application to read configuration file and program gNB RRC
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- RRC can configure PDCP, RLC, MAC
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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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**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 procedreat gNB
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- MAC downlink scheduler (fixed allocations)
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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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- **As of May 2020** only DL was validated with COTS phone ; UL in progress, validated with OAI UE in noS1 mode
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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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[OAI wiki home](https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/home)
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[OAI softmodem build procedure](BUILD.md)
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[Running the OAI softmodem ](RUNMODEM.md)
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