Flexible Access System Architecture (FASA) for the Next-Generation Optical Access Network Development

Transcription

1 NGON 2016 Nice Flexible Access System Architecture (FASA) for the Next-Generation Optical Access Network Development 1 st July, 2016 Jun-ichi Kani NTT Access Network Service Systems Laboratories, NTT Corporation

2 Outline Trends in broadband access services and technologies Trend in broadband services in Japan New broadband strategy in NTT and new services combining mobile and fiber Evolution of mobile broadband technology and mobile fronthaul Flexible Access System Architecture (FASA) Operators issues FASA concept, architecture, etc. Use cases Related works Summary Access Network Slicing 1

3 Number of subscribers Trends in broadband services in Japan 100,000,000 LTE 10,000,000 ADSL FTTH BWA CATV 1,000,000 BWA: Broadband mobile wireless access using 2.5-GHz band ~ Mobile WiMAX Reference: An announcement from Japanese Ministry of Internal Affairs & Communications 2

4 New broadband strategy in NTT NTT has changed the broadband business strategy from B2C (Business to Customer) to B2B2C (Business to Business to Customer). We have started wholesaling fiber access according to this strategy. This business model is called Hikari Collaboration Model. 3

5 Number of partners and end users The number of partners exceeded 300 in NTT East. The partners include MNOs, MVNOs, ISPs, local cable-tv operators, rentalvideo companies, etc. Number of partners and end users in the Hikari Collaboration Model (in NTT East only) 3 million Number of partners (retail providers) Number of end users 1 million 2 million 4

6 New services combining mobile and fiber Mobile network operators start providing (1) more affordable rates, (2) onestop service and (3) new services combining mobile and fiber using the wholesale FTTH infrastructure. docomohikari_e.pdf 5

7 Evolution of mobile broadband technology 3GPP std. LTE (3.9G) LTE-Advanced (4G) Release Release 8, 9 Release 10 to 13 Release 14, 15 Development 2008 to to 2015 Started in 2016 Commercialization (in Japan) Maximum speed per User Equipment Frequency bands (in Japan) Technologies Dec 2010 (NTT docomo) Mar 2015 (NTT docomo) Commercial 75~150 Mbps 250~500 Mbps? 5G 2018 to 2020? Standard ~300 Mbps ~4 Gbps (~26 Gbps) ~10 Gbps 700 to 900MHz, 1.5 to 2.1GHz, etc 2.5GHz band, 3.5GHz band, etc Carrier Aggregation Inter-cell coordination Small-Cell Enhancement C/U split Etc Also over 6GHz? New Radio Access Technologies (New RAT) Massive MIMO Etc 6

8 RAN for the 4G and 5G mobile services 4G~ C-plane, U-plane U-plane Macro cell (UHF band) Small cells (e.g. lower SHF; <6GHz) 5G~ C-plane U-plane Macro cell (UHF band) Small cells (e.g. lower SHF; <6GHz) Spot cells (e.g. higher SHF; >6GHz, EHF band) References Y. Okumura, et al., Future Radio Access Mobile Optical Network: Part 1, IEICE Technical Report, RCS (in Japanese), Y. Okumura, et al., Future Radio Access Mobile Optical Network: Part 2, IEICE Technical Report, RCS (in Japanese). 7

9 TWDM-PON for dense small cells (1/2) TWDM-PON in ITU-T G.989 series (NG-PON2) will allow concentration and dispersion of wavelength resources. In the next generation fronthaul, the optical bandwidth per cell changes depending on the amount of real traffic, for which the bandwidth and wavelength resources can be properly assigned. Future OLT l 1 l 2 l 3 l 4 Transceivers l mux 8

10 TWDM-PON for dense small cells (2/2) The wavelength resources can be re-allocated to adapt to the concentration or the dispersion of the traffic according to users travel. Future OLT l 1 l 2 l 3 l 4 Transceivers l mux Traffic concentration 9

11 Future optical access systems Support of emerging new services by VNOs Support of small cells and spot cells by MNOs Diversification of services and requirements Optical Access Systems will evolve from FTTH infrastructure to the common access platform for various VNOs/MNOs Flexible Access System Architecture (FASA) 10

12 Outline Trends in broadband access services and technologies Trend in broadband services in Japan New broadband strategy in NTT and new services combining mobile and fiber Evolution of mobile broadband technology and mobile fronthaul Flexible Access System Architecture (FASA) Operators issues FASA concept, architecture, etc. Use cases Related works Summary Access Network Slicing 11

13 Operators issues Evolving services (5G mobile, next-gen wireless LAN, etc.) Fronthaul (MNO A) Hardware A Firmware A Optical access Fronthaul (MNO B) S Hardware B Firmware B FTTH Hardware C Firmware C FTTB Hardware D Firmware D Various access schemes MNO: Mobile Network Operator FTTB: Fiber To The Business Vender-dependent and single-purpose equipment It is difficult to quickly add/change functions for new services. It is difficult to customize functions to each retail provider in case of wholesaling access. Inaccurate demand forecast leads to wasteful investment or shortage of each equipment. 12

14 Logical configuration (conceptual image) FASA Flexible Access System Architecture NTT s new concept to address these issues by the help of virtualization technologies. References NTT Press Release, Introducing the New FASA Concept for Future Access Systems, Feb 8, Lightwave Online, NTT's Flexible Access Systems Architecture envisions white-box OLTs, Feb 11, Etc. FASA-based OLT Software modules Service achieved by combining modularized functions Wavelength control Bandwidth control OAM Multicast New function Common hardware TWDM-PON MAC/PHY External hardware module... Replace depending on the requirement 13

15 APIs for FASA In order to enable simple and easy function add-on, a commonly usable APIs (Application Programming Interfaces) are very important. Reference FASA White Paper, FASA 仮想化 OLT OLT Interface for configuration / status acquisition Wavelength ソフトウェア部品 control ( 部品化された機能 ) Software components (Modularized functions) 波長制御 OAM OAM ( 監視制御 ) Multicast Bandwidth control マルチキャスト 帯域 制御 New feature X New New 新機能新機能 X feature Y feature Y Z APIs API Common 汎用ハードウェア hardware External module 外付けモジュール External module 外付けモジュール 14

16 Use case of FASA: Residential service FASA provides broadband service for residential customers, same as the current systems. FASA aims to flexibly update/replace the functions (e.g. DBA) by updating a software without rebooting the OLT/ONUs. ONU PS CO OLT SR-DBA v.1.0 SR-DBA v.2.0 ONU CO: Central Office DBA: Dynamic Bandwidth Assignment PS: Power Splitter SR: Status Report ONU Flexible function update by software update K. Asaka and J. Kani, Contribution in FSAN Louisville meeting, June

17 Use case of FASA: 5G mobile fronthaul (MFH) In 5G mobile system, dense small cells could be accommodated by a PON as MFH, which has an advantage in terms of low CAPEX of physical infrastructure. By replacing the DBA software from SR-DBA to LL-DBA, TDM-PON-based MFH can be realized. This avoids re-building the OLT from the beginning. Share one feeder fiber CU PS CO OLT SR-DBA RU RU LL-DBA CU: Central Unit LL: Low Latency RU: Remote Unit RU Share one physical interface Agile service adaptation by software replacement K. Asaka and J. Kani, Contribution in FSAN Louisville meeting, June

18 Central Office Re-architected as a Datacenter (CORD) A collaborative effort between AT&T and the Open Networking Lab (ON.Lab). The goal is to allow Telcos to benefit from both the economies of scale (infrastructure constructed from a few commodity building blocks) and the agility (the ability to rapidly deploy and elastically scale services). volt, vcpe, vbng, vcdn ONOS + OpenStack + XOS PON OLT MACs ONU References Larry Peterson (ON.Lab), IEEE Software Defined Networks - Newsletter, CORD: central Office Re-architected as a Datacenter (CORD), November Presentations in ONS Inspire! Webinar CORD: Central Office Re-architected as a Data center, Nov 17, CPE 17

19 Challenges for deeper softwarization Presentation W3F.1 in this OFC proposes virtualization of EPON OLT functions with a challenge to realize software-based Multi-Point MAC Control (MPMC). K. Nishimoto et al, Virtualization of EPON OLT functions and collision suppression techniques for Multi-Point MAC Control, OFC 2016 W3F.1. 18

20 Evolution of FASA Modularization of various functions is highly expected in the near term. Further discussions in forums and standard bodies are expected on (1) which functions should be virtualized and (2) how deep the access network functions should be softwarized. Server OAM Access network equipment Access network equipment Virtualization Bandwidth control Power saving OAM API Bandwidth control Power saving API PON OLT Hardware Access control Encryption PHY processing Optics Deep softwarization Hardware Access control Encryption PHY processing Optics 19

21 Virtualization of mobile functions: Virtual Broadband Unit (vbbu) in C-RAN Advantages Computation resources can be flexibly allocated to each virtual BBU on demand. The BBU function can be dynamically reconfigured and adjusted. Mobile Fronthaul BBU Pool BBU 1 Phy/Mac Real Time OS BBU 2 Phy/Mac Real Time OS Hypervisor BBU n Phy/Mac Real Time OS General Purpose Processor Platform RRH RRH RRH RRH Reference Chih-Lin I, et al, Recent Progress on C-RAN Centralization and Cloudification, IEEE Access, volume 2, pp ,

22 Access network slicing Modularization, softwarization and virtualization make it easy to realize the access network slicing. This will drive the construction of the common access platform for various VNOs/MNOs. Functions for VNOs/MNOs Base Station Core network slice (mobile) Aggegation Core network slice (fixed) Local controller Global controller Local controller.. RRH ONU ONU ONU RRH ONU OLT BBUs Switch and Aggregation Infrastructure (Modularized equipment, NFVI in future?) Core network infrastructure 21

23 Summary Optical Access Systems will evolve from FTTH infrastructure to the common access platform for various VNOs/MNOs Flexible Access System Architecture (FASA) based on modularization of access-network functions will address diversification of services and requirements. 22

24 Thank you for your attention! 23