(edited by yafie)

1. NB-IoT nFAPI

2. 1. Introduction

3. 1. Introduction
1.1. nFAPI Interfaces

4. eNB for FAPI*
eNB for nFAPI
1.2. nFAPI Architecture
*) Out of scope
of this
document

5. 2. NB-IoT nFAPI concept

6. 2. NB-IoT nFAPI concept
2.1 nFAPI Introduction

7. 2.2 nFAPI Procedures
• The nFAPI P5 interface configures the PNF device at the PNF device level and at the static PHY level.
• The nFAPI P7 interface operates the PHY for the subframe procedures.
2.2.1 nFAPI PNF configuration procedure
2.2.2 nFAPI P5 PHY configuration procedure
2.2.3. nFAPI p7 subframe procedure

8. 2.2.1 nFAPI PNF Configuration Procedures
1. Inizialitation
2. Reset
3. Restart
4. Reconfigure
• See next slide for detail of
PNF Inizialitation
Procedure & PNF PARAM
message exchange.
*) See the full spec
documents for other
procedure and message
exchange

9. • PNF Inizialitation Procedure &
PNF PARAM message exchange.

10. • General Flowchart of
nFAPI PNF Configuration Procedures

11. Summary of nFAPI PNF Configuration Procedures (1)

12. Summary of nFAPI PNF Configuration Procedures (2)

13. 2.2.2 nFAPI P5 PHY Configuration Procedures
1. Inizialitation
2. Terminate
3. Restart
4. Reset
5. Reconfigure
6. Query
7. Notification
8. Measurement
• See next slide for detail of
Inizialitation Procedure &
PARAM message exchange.
*) see full spec documents
for other procedure and message
exchange

14. • Inizialitation Procedure & PARAM message exchange.

15. Summary of nFAPI P5 PHY Configuration Procedures (1)

16. Summary of nFAPI P5 PHY Configuration Procedures (2)

17. • 2.2.2 nFAPI P7 Subframe Procedures
The nFAPI P7 interface configures the PNF PHYs every subframe.
Procedures Purpose
1. PHY Synchronization estimation and compensation of timing differences between the VNF
and the PHY instance
2. API message order The L1 API has constraints on when certain subframe messages can be
sent, or will be
received, by the L2/L3 software.
3. API message timing nFAPI P7 messages sent from the VNF to PNF must arrive at the PNF a
minimum time before the subframe they configure starts transmission
on the air interface
4. Semi-static information create periodic transmission patterns on the uplink
5. Uplink HARQ signalling ACK or NACK downlink
data transmissions sent to a UE.
6. Downlink BCH, PCH, DLSCH, MCH, PRS, CSI
7. Uplink RACH, ULSCH, SRS, CQI, SR
8. RNTI Measurement SNR, Timing advance, Doppler estimation

18. • 2.3 nFAPI messages
• 2.3.1 nFAPI Transport Layer

19. • 2.3.2 General Message Format

20. • 2.3.2.1 nFAPI message ID Value

21. • 2.3.2.2 Vendor Extention
*) see full spec documentation for 2.3.3 nFAPI p5
message 2.3.4 nFAPI P7 Sync Message

22. nFAPI Implementation – P5

23. nFAPI Implementation – P5
• Source Code:
https://gitlab.com/changshengliusamuel/openairinterface5g/blob/dev
elop-nb-iot/openair2/LAYER2/MAC/config_NB_IoT.c
• For the explanation of the flowchart please refer to:
http://bit.ly/nfapi-implementation-p5

25. A B
A B

26. A B C
CBA

27. nFAPI Implementation – P7

28. nFAPI Implementation – P7
MAC
nFAPI PNF
thread
Output_handler()
recvfrom()
callback
nFAPI VNF
thread
PHY
Schedule_
response()
recvfrom()
callback
UDP UDP
Global
Globalrxtx thread
rxtx thread
Compile Option:
nfapi_mode = 0: default
nfapi_mode = 1: VNF
nfapi_mode = 2: PNF
nfapi_mode = 3: VNF without USRP

29. NB-IoT nFAPI
Testing
Environment
Optional
Quectel BC95-b28
USB 3.0
OAI NB-IoT
eNB PNF
EPC
OAI NB-IoT
eNB VNF
Ethernet
USB 3.0
P5 P7
nFAPI interface
P7P5
nFAPI interface
L3
L2
UDPSCTP

30. NB- IoT nFAPI Result Log
VNF PNF

31. NB-IoT nFAPI MSC

32. Thank you for your attention.