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Mobility Concept investigated in European BRAIN Project Serving Global and Local IP Mobility

EU Project BRAIN Handover in the IP-based Radio Access Network Arndt Kadelka Aachen University of Technology, ComNets, Germany. Mobility Concept investigated in European BRAIN Project Serving Global and Local IP Mobility Performance of HiperLAN/2 Handover Procedures

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Mobility Concept investigated in European BRAIN Project Serving Global and Local IP Mobility

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  1. EU Project BRAINHandover in the IP-based Radio Access NetworkArndt KadelkaAachen University of Technology, ComNets, Germany Mobility Concept investigated in European BRAIN Project Serving Global and Local IP Mobility Performance of HiperLAN/2 Handover Procedures Integration of HiperLAN/2 Mobility and Local IP Mobility

  2. Other Networks IP WAN IP Backbone Supports: - QoS for realtime services- Multicast- Handover SGSN UTRAN Node B Node B RNC Roaming Vertical Handover BRAIN Radio Cells Horizontal Handover BRAIN Radio Cells BRAIN System Concept using HiperLAN/2-based Access

  3. Serving Local and Global Mobility • Hierarchical Mobility • Mobility across Wireless Access Networks served by rather slow Mobile IP • Mobility within Wireless Access Network served by fast protocols, e.g., Cellular IP, HAWAII

  4. Local Handover within Access Network – Cellular IP • Route update by Uplink IP packets sent hop-by-hop to Gateway Router

  5. HiperLAN/2-based Radio Access • Operates in the license exempt spectrum in5-6 GHz band • Radio cells up to 200 m • 25 Mbit/s typical data rate • Radio access can be adapted to various networksBRAIN: IP Conv. Layer

  6. Actions to Perform a handover In H/2 fast handover decision and execution is performed by the MTs: • Scanning for alternative channel, i.e., served by different APT • MT indicates absence to serving AP, AP stops data transmission • MT performs measurements on alternative channel(s) • MT may return to serving AP or perform a handover • Handover decision • MT decides to perform a handover based on RSSI and PER measurements • Hysteresis to avoid ping-pong-effects • Handover execution • MT may indicate handover intention to serving AP • MT initiates handover by Handover_Request to target APT, i.e, forward handover • Re-establishment of link layer communication

  7. Scanning Period

  8. Packet Transmission Delay owing to Scanning Downlink Transmission Uplink Transmission Amount of data effected by scanning:

  9. Handover within H/2 Radio Access Network • Radio HO performed within DLC • IP layer not involved • Inter-Subnet Network Handover involves also IP layer • Route update of IP routing tables

  10. Radio Handover Execution

  11. Serving Local Mobility with H/2 • Changing point of attachment to the network • Re-establishment of link layer communication via the air interface • Re-registration to the IP network • Authentication • Maintaining on-going DLC connections • Integration with IP mobility via IP CL

  12. Slow Network Handover Procedure • Interworking with Cellular IP • IP CL triggers route update packet • Loss of IP packets received at APold before route update execution

  13. Analysis of Slow Network Handover

  14. Packet Loss during Slow Network Handover

  15. Fast Network Handover with Backbone Signaling • Information about on-going DLC connections retrieved via backbone • Packets routed to APold are tunneled to APnew • DLC address of APold is indicated during HO_Association • AP has to maintain address mapping table • APold DLC  IP address

  16. Fast Network Handover Procedure

  17. Analysis of Fast Network Handover

  18. Making use of Slow and Fast Network Handover • To make best use of Fast Network Handover procedure IP address of old AP must be known • Mapping table may be set up • manually, by operation and maintenance procedures • administration effort • not flexible • dynamically, by following procedure • AP selects handover procedure to be executed, i.e., Slow or Fast Network Handover • MT performing 1st Handover from APold to Apnew carries out Slow Network Handover and provides DLC address (during HO_Association) and IP address of Apold (via Info_Transfer) • Stores DLC/IP-address mapping • Subsequent handovers from this APold are performed according Fast Handover procedure

  19. Conclusion • H/2 defines handover procedures to serve local mobility • For H/2 mobility integration with IP local mobility interworking functions are investigated and defined for the new IP CL • To perform network handover involving the IP network almost as fast as radio handover address mapping table has to be maintained in IPCL • Procedure defined to set up the mapping table dynamically • Work will be continued in follow-up project MIND • Specification of IPCL and contribution to ETSI/BRAN • Mobility integration with UMTS (Vertical Handover)

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