5g new radio - openairinterface...5g nr vs lte : system overview interworking with lte : standalone...
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Florian Kaltenberger (Eurecom)
5th OAI workshop, BUPT, 22.6.2018
5G New Radio in OpenAirInterface
1
“Complete Stage-3 specifications on eMBB including support of low latency for E-UTRA-NR DC via EPC where the E-UTRA is the master until December 2017”
NR 3GPP timeline
19.4.2018 Florian Kaltenberger 2
5G NR vs LTE : System Overview
Interworking with LTE : Standalone (SA) or Non Standalone (NSA)
L2/L3: New RRC INACTIVE state New L2 QoS layer: SDAP Reordering in PDCP instead of RLC, no RLC SDU concatenation MAC scheduling taking into account numerology Asynchronous HARQ in UL and DL
19.4.2018 Florian Kaltenberger 3
5G NR vs LTE : Physical Layer
Up to 640 Mhz system bandwidth (100MHz below 6GHz)
Scalable numerology allows from 15 kHz to 480 kHz subcarrier spacing
Flexible TTI (1-14 OFDM symbols)
Channel coding : LDPC and Polar codes
Beam Management
Bandwidth Parts
Flexible TDD
19.4.2018 Florian Kaltenberger 4
5G-ready OAI Demonstration at MWC18
Collaboration between TCL, Eurecom, Syrtem
Based on OAI 4G protocol stack for eNB and UE
80MHz bandwidth (4x overclocked LTE) Similar to 60kHz subcarrier spacing in NR
Based on custom build SDR from Syrtem (Xilinx Zynq + ADRV9371
19.4.2018 Florian Kaltenberger 5
Use LDPC in downlink (instead of Turbo)– Very efficient software
implementation of both encoder and decoder (up to 150Mbps)
– Offload of LDPC decoder to FPGA for max throughput (300Mbps)
Notes on higher layer config
First specifications & deployments are for non-standalone operation (NSA)
all 5G control plane (RRC)
traffic transported over LTE, e.g., initial configuration
In our initial implementation this structure will be made available through a file at both gNB and UE
Notes on L1/L2 Interface
OpenAirInterface eNB uses FAPI for L1/L2 interface
Specified in SCF082.09.05 (Small Cell Forum, 2017-05-18) up to Rel 13 P5 – the PHY mode control interface
P7 – the main data path interface
Available in open-source from CISCO (https://github.com/cisco/open-nFAPI)
We are updating this spec to Rel15 for gNB
We are also specifying a similar interface for NR-UE
19.4.2018 Florian Kaltenberger - p 8
5G-NR Hardware requirements
5G configurations supported by OAI
30khz subcarrier spacing: 40 MHz (106PRB, 1272 subcarriers, 38.15MHz eff. bandwidth)
• FFT size 2048 61.44MHz sampling rate
80MHz (217 PRB, 2604 subcarriers, 78.12MHz eff. bandwidth)
• FFT size 4096 sampling rate 122.88MHz, or
• FFT size 3072 sampling rate 92.16MHz (3/4 sampling)
60khz subcarrier spacing: 100MHz (132 PRB = 1584 subcarriers, 95.04MHz eff. bandwidth)
• FFT size 2048 sampling rate 122.88MHz,
• no 3/4 sampling possible
19.4.2018 Florian Kaltenberger - p 9
Hardware for 5G-NR
USRP X310 USRP N310 SYRTEM SDR YunSDR Y450
Data acquisition Gbit EtherNet,PCIexpress
Gbit Ethernet PCIexpress PCIexpress, GbitEthernet, USB3
MIMO 2x2 MIMO, 4x4 MIMO 2x2 MIMO 2x2 MIMO
RF chip n/a** AD9371 (x2) AD9371 AD9371
Sampling rates 200 MHz, 184.32 MHz
122.88MHz, 125MHz, 153.6MHz
122.88MHz 122.88MHz
Frequency range DC-6GHz (dependson daughterbrd)
10 MHz – 6GHz 10 MHz – 6GHz 10 MHz – 6GHz
Price ~€5,000 ~€10,000 ??? ???
Duplexing FDD* or TDD* FDD* or TDD* FDD* or TDD* FDD* or TDD*
Output power n/a** 12-18dBm ??? 10dBm
Noise figure n/a** 5.5-7.5dB ??? ???
Open source FPGA/driver FPGA/Driver Limited ???
5G Compatibility 40MHz, 80MHz (with ¾ sampling)
40, 80, 100MHz 40, 80, 100MHz 40, 80, 100MHz
6/25/2018 10
*needs external RF elements
** depends on daughterboard
Current development status
One common branch for gNB and UE: develop-nr
Created new directory structures for eNB, LTE-UE, gNB, and NR-UE specific code
Created new executables lte-softmodem, nr-softmodem, lte-uesoftmodem, nr-uesoftmodem
introduced new structures for gNB and NR frame parameters
Development process
Develop-nr synchronized regularly with develop
Features branch of from and merge back to develop-nr
19.4.2018 Florian Kaltenberger - p 11
Current development status gNB
PHY layer additions Phy_procedures_gNB_TX
NR-PSS and NR-SSS
Generic polar encoder and decoder
PBCH payload generation, scrambling, encoder
PBCH DMRS and PBCH modulation
Higher layers Import of 38.331 RRC messages using asn1c*
Generation of MIB
Application to read configuration file and program gNBRRC
RRC -> MAC configuration ongoing
NR FAPI-style interface ongoing for MAC->PHY configuration
19.4.2018 Florian Kaltenberger - p 12
* New version of as1nc required to support new syntax and multiple specs: https://github.com/brchiu/asn1c/tree/s1ap
Current development status UE
Integrated/updated UE into new common 5g branch
PSS/SSS detection
PBCH RX channel estimation & compensation (demodulation) Decoder ready to be integrated
PDCCH RX Supported DCI formats: 00, 10 Functions to handle filling and demapping of fields (instead of static configurations like in
LTE)
PDSCH DMRS ready for validation
SRS TX Support periodic SRS Ready for validation
TDD Support semi static config UL asynchronous harq ongoing
PUCCH TX UCI started
- p 13
OAI 5G-NR ROADMAP
OAI 5G NR v1
Target: Aug 2018
Perf: same as v0
Planned features: ‘NSA’, NR Layer 1 DL 40MHz -80MHz SCS 30kHz DL CP-OFDM NR-SSS/PSS NR-PBCH NR-PDSCH NR-PDCCH
Prioritized additional features (open for 3rd party contribution)priority
Self-contained structure (requires symbol-based receiver) 1 Mini-slot 1 Add DCI formats 2 add. PRACH formats (list) 2 semi-persistent and aperiodic SRS (periodic SRS supported) 2 PDSCH DMRS other than front loaded ? 3
HW support: same as v0
IOT scope : OAI – OAI (PHY test mode)
OAI 5G NR v2
Target: Q3/18
Perf: same as v1 + Over The Air @ 3.5GHz
Planned features: L1 update, UL channels, TDD UL DFT-s-OFDM NR-PUCCH, NR-PUSCH & periodic SRS NR-TDD support (semi static config) OTA improvements (AGC, freq tracking)
Prioritized additional features (open for 3rd party contribution) priority LTE-NR Dual connectivity 1 Dynamic TDD 2 HARQ / Fast ACK 2 semi-persistent and aperiodic SRS 2 UL CP-OFDM 3
HW support: + RF front-end 3.5GHz
IoT scope : OAI – OAI full stack NSA/L3-LTE
Planned for Orange salon de rechercheDec. 2018!
OAI 5G NR v3
Target: Q4/18
Perf: 600Mb/s with FPGA v2
Planned features: MIMO & High-performance MIMO 4 layers decoder LDPC: enhanced SW version, opt. FPGAv2 full TP up to 4 HARQ processes with full TP FPGA LDPC RRC NSA
Prioritized additional features (open for 3rd party contribution) M-MIMO Beam tracking 1 Defined commercial IOT profile support 1 left-over v1-v2 1
HW support: v2 + new FPGA UltraScale+ w/ 4 streams support, LDPC full TP
IOT scope : OAI – OAI full stack + OAI UE - commercial gNodeB(tbc)
OAI 5G-NR further roadmap (2019)
Interoperability with commercial equipment
Ultra reliable low latency communication (UrLLC) < 2ms latency (RTD) 15-60kHz SCS Low throughput Option 1: relying on mini slot Option 2: relying on self contained structure
Massive MIMO French Project MASS-START 3.5Ghz and 28GHz band Support for up to 64 antennas (potentially hybrid
analogue-digital architecture) Up to 8 layers transmission (max 4 layers per user)
19.4.2018 Florian Kaltenberger 18
Join the 5G-NR development
Current development team Hongzhi, Augustin, Jaques (TCL) Kenny, Calvin (NTUST) Guy, Florian, Turker, Judy, Eino, Raymond (Eurecom) Benoit (SYRTEM)
Weekly development calls Asia: Friday Odd weeks: 11:00 CEST (17:00 CST) Americas: Friday Even weeks: 14:00 CEST Reminders on mailing list
Trello task manager https://trello.com/b/hrVm1S0n/oai-5g-nr
Mailing list https://lists.eurecom.fr/sympa/info/openair5g-nr
19.4.2018 Florian Kaltenberger - p 19
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