1. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Personal Wireless Communications ‘98 Olli Martikainen*, Esa Nyman**, Juhana Räsänen*, Petteri Koponen* * Helsinki University of Technology, Laboratory of Telecommunications Software and Multimedia ** Telecom Finland

2. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Contents Introduction Broadband services in the wireless and mobile networks Multicast services in mobile networks Example: Calypso TV distribution service Conclusions

3. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Broadband services High bandwidth (video) point-to-point calls Multimedia content delivery (media on demand) Multicast programme delivery (eg TV) Teleconferencing, telepresence Multiuser games Internet services

4. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Mobile/wireless trends 3rd generation mobile networks should provide significant improvement over current services Customers require access to the same services as in the fixed networks Mobile terminal device development enables new applications Wireless access networks (eg LMDS) evolve

5. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Problems Bandwidth, radio resource usage, quality of service, handovers … Mobile terminal capabilities Customer satisfaction Example: TV is a mobile broadband service. Handheld TV sets have been available for years, yet few people actually have them.

6. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks TV as a multicast service Digital TV channels over broadband network Smooth transition from the analog TV: –An old, familiar service: easy to comprehend –Can be extended with different value-added services (Internet, electronic commerce, interaction …) –Multicast is light for the network compared with eg media on demand  suits well for mobile networks

7. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Calypso TV distribution service STB / PC Calypso SwC Viewer Channel requests TV streams Infrared Remote Control Agent Client TV distribution Service Agent TV serverAccess switch

8. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Multicast in wireless networks Many subscribers receive the same program simultaneously  The program should be transmitted only once in each cell to conserve bandwidth FDMA/TDMA: receivers share the frequency or the timeslot CDMA: receivers can share the CDMA key

9. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Service control and CDMA keys Client requests a channel and network responds with the CDMA key of that particular channel No separate connection for each subscriber CDMA key management must be accessible from the application layer BSC MT A C BTS Req Key

10. PWC ‘98 Tokyo, April 8-9 1998 Terminal Mobility in Broadband Networks Conclusions Introducing broadband services into mobile networks is more than providing the technical means to do that Mobile multicast services may become more important due to their bandwidth-saving nature CDMA provides a practical way to combine mobile multicast and service access control