1. 1 Wireless ATM networks new architecture elements and functionality supporting mobility

2. 2 Service scenarios wireless LAN networks with dynamically modified structure broadband wireless access networks wireless point-to-point links

3. 3 Possible R&D directions GSM System + –multimedia support –QoS support ATM System + –radio access –mobility

4. 4 New requirements for WATM Wireless access (ETSI BRAN) shared medium relatively high error ratios relatively low bit rates Mobility (ATM Forum) Location Management (LOC) Handover Control (HOC) without loosing connections and with QoS persistence

5. 5 Wireless ATM System New components –ATM switch with “M” UNI/NNI interface –ATM base station with “M” UNI/NNI and “W” UNI interfaces –ATM mobile terminal with “W” UNI interface + mobility support software + radio ports

6. 6 WATM Radio Access PHY Layer MAC Layer LLC Layer

7. 7 WATM PHY Layer Cell radius: –50-500 m (microcell or picocell environment) Band: –5GHz Unlicensed NNI band (USA) –"Hiperlan" band (Europe) –in future 20/30 or 60GHz (limited mobility) Bit rate: –~25Mb/s (2-4Mb/s sustained, 5-10Mb/s peek VCs) Modulation: –QPSK/GMSK or OFDM Access Method: –TDMA/TDD

8. 8 WATM MAC Layer Reservation based MAC protocols –Piggybacking –Assigned reservation slots –Contention slots Pooling based MAC protocols Generic frame structure (TDMA/TDD)

9. 9 WATM LLC Layer Error detection with retransmission (SREJ ARQ) Forward error correction

10. 10 WATM Mobility Support Location Management (LOC) Handover Management (HOC)

11. 11 WATM Location Management Extended addressing for MTs –home address (HA) –foreign address (FA) Possible solutions FA of the MT is maintained by its home ATM switch Designated LOC servers maintaining HAs to FAs mapping exists in the system

12. 12 WATM Handover Control Possible initiators –MT vs. BS –old-BS vs. new-BS Possible strategies –New connection strategy –Path extension strategy –Connection Tree Strategy

13. WATM Status 13 Projects –Race II –ACTS (Advanced Communications Technologies and Services) Magic WAND AWACS (ATM Wireless Access Communication System) Samba (System for Advanced Multimedia Broadband Applications) MEDIAN Standards (ETSI) –HIPERLAN Type 2 – wireless local access –HIPERACCESS – wireless local loop –HIPERLINK – wireless point-to-point link

14. THANK YOU 14