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  • Often called MIH or Media Independent Handover
  • So the core network treats it just like it’s a handoff
  • WiFi_Handoff

    1. 1. Cellular - Wifi Handoff Robert Thompson
    2. 2. What is Cellular to Wifi Handoff? <ul><li>It is the seamless handoff of a connection between cellular and wireless networks. </li></ul>
    3. 3. Example <ul><li>A cellular phone user in the midst of a call should be able to enter an 802.11 network hotspot and be seamlessly handed off from a cellular network to the 802.11 network and back again when leaving the hotspot. </li></ul>
    4. 4. Standards <ul><li>IEEE 802.21 </li></ul><ul><li>UMA(Unlicensed Mobile Access)/GAN(Generic Access Network) </li></ul>
    5. 5. 802.21 <ul><li>Emerging IEEE standard </li></ul><ul><li>Support algorithms to enable seamless handover between networks of the same type as well as different network types </li></ul>
    6. 6. 802.21 Supports <ul><li>GSM </li></ul><ul><li>WiFi/802.11 networks </li></ul><ul><li>Bluetooth </li></ul><ul><li>GPRS (2.5G GSM) </li></ul>
    7. 7. 802.21
    8. 8. 802.21
    9. 9. UMA/GAN <ul><li>Adapted by 3GPP in April 2005 </li></ul><ul><li>System to allow seamless handover between local networks and wide area networks </li></ul>
    10. 10. UMA/GAN <ul><li>Local Network/Unlicensed spectrum </li></ul><ul><ul><li>Bluetooth </li></ul></ul><ul><ul><li>802.11 </li></ul></ul><ul><li>Wide Networks </li></ul><ul><ul><li>GSM/GPRS </li></ul></ul><ul><ul><li>UMTS </li></ul></ul>
    11. 11. UMA/GAN <ul><li>Cellular network stays the same. </li></ul><ul><li>Once a LAN is detected a secure IP connection thru a gateway is made to a server called a GAN Controller(GANC). </li></ul><ul><li>The GANC translates the signals to make it appear to be coming from another BSC. </li></ul>
    12. 12. UMA/GAN <ul><li>When the handset moves from GSM to WiFi, the core network treats it as though it was a handoff between BSC’s. </li></ul>
    13. 13. UMA/GAN
    14. 14. UMA/GAN Terms <ul><li>UNC - UMA Network Controller </li></ul><ul><li>SGSN - Serving GPRS Support Node </li></ul><ul><li>PLMN - Public land mobile network </li></ul><ul><li>UMAN – Unlicensed Mobile Access Network </li></ul>
    15. 15. UMA/GAN
    16. 16. UMA
    17. 17. UMA/GAN <ul><li>Mobile identity on cellular network and wireless networks are the same. </li></ul><ul><li>This means current core mobile network will remain the same. Lowers the cost to offer the new service. </li></ul><ul><li>Independent of current Wifi technology. </li></ul>
    18. 18. UMA/GAN Modes <ul><li>GERAN-only: only cellular networks used. </li></ul><ul><li>GERAN-preferred: Cellular if available. Otherwise, Wifi is used. </li></ul><ul><li>GAN-preferred: Use a Wifi if in range. Otherwise, use the cellular network. </li></ul><ul><li>GAN-only: Use only the Wifi connection. </li></ul>
    19. 19. UMA/GAN <ul><li>Nokia 6136  </li></ul><ul><li>Samsung P200  </li></ul><ul><li>Motorola A910  </li></ul>
    20. 20. Advantages <ul><li>Better coverage </li></ul><ul><li>Relieves congestion </li></ul><ul><li>Combine Services </li></ul>
    21. 21. Advantages <ul><li>For Subscribers </li></ul><ul><ul><li>Cheaper prices </li></ul></ul><ul><ul><li>Convenient </li></ul></ul><ul><ul><li>Fix coverage issues yourself </li></ul></ul>
    22. 22. Problems <ul><li>Two standards </li></ul><ul><ul><li>Industries are split </li></ul></ul><ul><li>Battery Life </li></ul><ul><ul><li>2 hours </li></ul></ul>
    23. 23. Questions <ul><li>What is Cellular-Wifi handoff? </li></ul><ul><li>Answer: Seamless handoff between a cellular and another wireless network. </li></ul><ul><li>What are the standards? </li></ul><ul><li>Answer: IEEE 802.21 and UMA/GAN </li></ul><ul><li>How does a handoff work? </li></ul><ul><li>Answer: Much the same way as current BS to BS handoff’s. See slide 16 </li></ul>