1. h:\athoc\publ\heidelb\eures_1.ppt 1 Workshop MTM `99 Moving to Mobility Broadband Hybrid Fibre Radio (HFR) Access Networks: Concepts and Evolutions by Dietrich Boettle and Hansjörg Haisch Alcatel Corporate Research Center EURESCOM in Heidelberg February 25, 1999

2. h:\athoc\publ\heidelb\eures_1.ppt 2 Overall Network View CoreAccess ISDN Internet WDM SDH/ATM Twisted Pair (POTS,ISDN) Twisted Pair (X DSL) FTTX User terminals Hybrid Fibre Coax Hybrid Fibre Radio satellite earth station satellite receiver BS mobile Terminal User terminals T T

3. h:\athoc\publ\heidelb\eures_1.ppt 3 Market for Wireless Local Loop/HFR 1997:1 million subscribers 2000:8 million subscribers 2002:50% annually growth source: Study by Strategic Group ref. Telecoms Today, Sept. 17, 1998 1997:1 million subscribers 2000:8 million subscribers 2002:50% annually growth source: Study by Strategic Group ref. Telecoms Today, Sept. 17, 1998 19971998199920002001year2002 1 8 10 12 18 20 million subscribers world-wide

4. h:\athoc\publ\heidelb\eures_1.ppt 4 Today´s situation Base stations connected to core network via STM-N lines Local termination of digital line segment, mux-demux, modem function, RF part No equipment sharing, even for distributive services Channel/service upgrade or reconfiguration requires action in the field Modulator/ Demod. Modulator bank

5. h:\athoc\publ\heidelb\eures_1.ppt 5 The role of residential telephony services

6. h:\athoc\publ\heidelb\eures_1.ppt 6 System needs for advanced video services ?

7. h:\athoc\publ\heidelb\eures_1.ppt 7 Data communication on broadband access systems (1) Characteristics of WWW usage today

8. h:\athoc\publ\heidelb\eures_1.ppt 8 Which residential service will be needed ?

9. h:\athoc\publ\heidelb\eures_1.ppt 9 Trends towards flexible service mix

10. h:\athoc\publ\heidelb\eures_1.ppt 10 Basic architecture of Broadband Wireless Local Loop system and traffic 1200/300 Mbit/s 160/300 Mbit/s Headend switch Remote antenna unit Feeder system 10... 25 km Traffic per sector: - Residential 300 Mbit/s 40 Mbit/s - Business traffic 75 Mbit/s + 400 Mbit/s broadcast 90° Assumption: - Subscriber density: 1000 per km - Cell radius: 2 km yielding 3000 homes per sector 2 Broadcast traffic: 400 Mbit/s 0 Individual traffic, residential/business:

11. h:\athoc\publ\heidelb\eures_1.ppt 11 Which feeder technology for BWLL ? Between headend and base station we will have : Traffic: Up to 2 Gbit/s per cell sector ! Distance: More than 10 km, up to 100 km System availability: Very high: > 99.996 % Only fibre optic transport is feasible

12. h:\athoc\publ\heidelb\eures_1.ppt 12 Exemplary Signal Spectrum at 42 GHz Downlink Uplink 1,3 GHz A AB B 200 MHz 40,543,343,542,0 MVDS band extended to 43,5 GHz Uplink bandwidth extended to 400 MHz Two subbands A and B Downlink band B is guard band for subband A Polarisation diversity allows 4 x 90° sectors with 2 subbands High frequency reuse factor possible with simple modulation f/GHz

13. h:\athoc\publ\heidelb\eures_1.ppt 13 Classical feeder concept for HFR-systems with SDH

14. h:\athoc\publ\heidelb\eures_1.ppt 14 Basic mm-wave feeder concepts for HFR-systems

15. h:\athoc\publ\heidelb\eures_1.ppt 15 Photonic transport of mm-wave signals (1) (Double Sideband Modulation)

16. h:\athoc\publ\heidelb\eures_1.ppt 16 Optical mm-wave Source based on heterodyne principle Overcome of fibre length limitation by single sideband spectrum Optical Filter DFB Laser Carrier generation f m = 29.875 GHz Filter Control MZM 2 Bias control Data at subcarrier frequency f= 2GHz MZM 1 Isolator Optical Amplifier Monitor coupler 1 Monitor coupler 2

17. h:\athoc\publ\heidelb\eures_1.ppt 17 60 GHz Hybrid-Fibre-mm-Wave field experiment

18. h:\athoc\publ\heidelb\eures_1.ppt 18 Fully integrated 60 GHz fibre optic base station transmitter

19. h:\athoc\publ\heidelb\eures_1.ppt 19 Photonic transport of mm-wave signals Photonic transport of 60 GHz signals over up to 111km fibre has been demonstrated. Degradation due to phase induced intensity noise and chromatic dispersion Experiment over 46,65 and 111km installed fibre Signal spectrum at 60 GHz Noise degradation over frequency and span length PIIN, [dB/Hz]

20. h:\athoc\publ\heidelb\eures_1.ppt 20 Digitised Feeder Example HFC upstream band digitisation: 5... 65 MHz2,5 Gbit/s 30 carriers QPSKDigital Combiner Option (Traffic Concentr.) 11 bit A/D Converter Overcome of analog signal degradation by digitised feeder

21. h:\athoc\publ\heidelb\eures_1.ppt 21 Summary Strong demand for BWLL as a part of a heterogeneous access network Initial driving force are business users, residential market later Base station system to be dense, flexible, reliable Fibre feeder mandatory to simple BS, evolving from base band via IF to RF Digitisation of feeder to introduce signal regeneration without sacrificing benefits of HFR concept