Design and Implementation of an Open Source NB-IoT enb

Transcription

1 Design and Implementation of an Open Source NB-IoT enb Presenter: Chin-Ya Huang, National Taiwan University of Science and Technology (NTUST) National Chiao Tung University (NCTU)

2 Outline Contributing members NB-IoT Introduction Differences between LTE and NB-IoT LTE to NB-IoT on OAI Contributions On-going Jobs 2

3 Contributing members Eurecom NB-IoT IRT-bcom NTUST University NOKIA Bell Labs TCL Bologna University 3

4 Contributing members Current teams: Bcom UBologna Eurecom Stephane Paquelet Vincent Savaux Matthieu Kanj Rodolphe Legouable Michele Paffetti Raymond Knopp

5 Contributing members Current teams: NTUST Ray Cheng Nikita Hsiao Calvin Hsu Nick Ho Eric Hsieh Vanessa Tsai Yaya Huang Alan Lee Gina Lin Xavier Liu Kenny Chen Asif Ali Zamzami

6 Outline Contributing members NB-IoT introduction Differences between LTE and NB-IoT LTE to NB-IoT on OAI Contributions On-going Jobs 6

7 Introduction about NB-IoT NarrowBand-Internet of Things(NB-IoT) is a 3GPP cellular network technology from release 13 for providing IoT services. NB-IoT can be deployed in-band, normal LTE carrier, or in the LTE carrier s guard-band, or standalone for deployments in dedicated spectrum. The architecture of NB-IoT is baseed on LTE but with some changes because of requirement of IoT service. [1] 7

8 Introduction about NB-IoT NB-IoT RAN and EPC architecture EPC 8

9 Introduction about NB-IoT NB-IoT control plane protocol stack NAS NAS RRC RRC S1AP S1AP PDCP PDCP SCTP SCTP RLC RLC IP IP MAC MAC L2 L2 PHY PHY L1 L1 UE Uu enb S1-C MME 9

10 Outline Contributing members NB-IoT introduction Differences between LTE and NB-IoT LTE to NB-IoT on OAI Contributions On-going Jobs 10

11 Differences between LTE and NB-IoT LTE NB-IoT Large packet size High data rate Large bandwidth Low delay tolerant Short battery life High device cost V.S. Small packet size Low data rate Small bandwidth High delay tolerant Very long battery life Low device cost High power consumption Low power consumption 11

12 Differences between LTE and NB-IoT Scheduling concept NPDCCH NPDCCH NPDCCH NPDCCH NPDCCH LTE scheduling Subframe-based scheduling DL/UL NPDSCH NPDSCH NPDSCH NPDSCH NPDSCH NPDCCH NPDCCH NPDSCH NPDSCH NPDSCH NB-IoT scheduling NPDCCH Period, NPDCCH period (PP)-based scheduling DL UL NPUSCH subframe (1ms) NPUSCH NPUSCH NPUSCH NPUSCH

13 Outline Contributing members NB-IoT introduction Differences between LTE and NB-IoT LTE to NB-IoT on OAI Contributions On-going Jobs 13

14 LTE to NB-IoT on OAI OAI supported NB-IoT adopts Nokia EPC as NB-IoT EPC. (cellular IoT control plane optimization, no SCEF) EPC 14

15 LTE to NB-IoT on OAI enb Job Partition L2 NB_initiate_ra_proc NB_rx_sdu NB_get_dci_sd NB_get_dlsch_sdu MAC Process_UL_IND Process_SCHED_REP IF_module UL_Indication Schedule_Response IF_module L1 rx_nprach NB_uespec_RX NB_TX Upper PHY Receiver Transmitter Lower PHY

16 LTE to NB-IoT on OAI OAI L2/L1 architecture 16

17 LTE to NB-IoT on OAI MAC Layer Modification New Scheduling procedure Different way to handle available resource Different DRX procedure New control elements Etc. UE Uu enb 17

18 Outline Contributing members What is OAI NB-IoT introduction Differences between LTE and NB-IoT LTE to NB-IoT on OAI Contributions On-going Jobs 18

19 Replaceable scheduling algorithm Replaceable scheduling algorithm module MAC Scheduler Replaceable Preprocessor Scheduling algorithm Can be replaced by developer Final scheduling Fix procedure for generate the scheduling result 19

20 Replaceable scheduling algorithm Replaceable scheduling algorithm module MAC Scheduler Preprocessor Your algorithm Scheduling algorithm Can be replaced by developer Final scheduling Fix procedure for generate the scheduling result 20

21 Scheduler log 21

22 Timing diagram tool Show the timing for all transmission and signal This tool read log file schedule_result.txt then generate the diagram schedule_result.txt is generated by enb, developer can fill this file for process timing diagram schedule_result.txt 22

23 Timing diagram tool 23

24 Timing diagram tool 24

25 Contributions Tools OAI NB-IoT Technical Document OAI Technical Feature List Testing Status: RA Msg3 reception B-COM is checking if Msg4 is decodable. Integration and testing with EPC 25

26 Outline Contributing members What is OAI NB-IoT introduction Differences between LTE and NB-IoT LTE to NB-IoT on OAI Contributions On-going Jobs 26

27 On-going Jobs NB-IoT Testing Random access Msg4 decoding Integration and testing with EPC LTE to 5G on OAI (NTUST, NCTU) RAN virtualization on top of M-CORD Soft-PHY realization 27

28 M-CORD Architecture M-CORD (Mobile CORD) enables 5G on CORD to fulfill the requirement of mobile network.

29 Disaggregated/Virtualized RAN 29

30 OAI LTE in M-CORD CORD is built by NCTU Porting vbbu to CORD (compute node of OpenStack) NTUST focus on LTE MAC Enhancement 30

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33 References [1] Y.-P. E. Wang, X. Lin, A. Adhikary, A. Grövlen, Y. Sui, Y. Blankenship, J. Bergman, and H. S. Razaghi, A Primer on 3GPP Narrowband Internet of Things (NB-IoT), IEEE Communications Magazine, vol. 55, no. 3, pp , Mar [2] B. Snow, Mobile CORD (M-CORD) Open Reference Solution for 5G, 2017, [Online]. Available: Keynote Snow.pdf 33

34 Thank you! 34