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Mobile IPv6 Fast Handovers for 3G CDMA Networks

Mobile IPv6 Fast Handovers for 3G CDMA Networks. < draft-yokota-mipshop-3gfh-01.txt >. Hidetoshi Yokota KDDI Lab Gopal Dommety Cisco. Not a focus but one benefit is FMIP over heterogeneous networks. Implement fast handovers in 3G CDMA networks adaptation of FMIPv6 to 3G CDMA networks

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Mobile IPv6 Fast Handovers for 3G CDMA Networks

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  1. Mobile IPv6 Fast Handovers for 3G CDMA Networks <draft-yokota-mipshop-3gfh-01.txt> Hidetoshi Yokota KDDI Lab Gopal Dommety Cisco

  2. Not a focus but one benefit is FMIP over heterogeneous networks Implement fast handovers in 3G CDMA networks adaptation of FMIPv6 to 3G CDMA networks FMIPv6 extensions Clarifications MN Focus of the draft WiMAX 3G CDMA AR AR AR WiFi AR BS BS BS BS AP

  3. Available information for the target network pilot channels cell information serving nodes location of BS or MN MN Handover trigger & information in 3G CDMA networks 3G core network PAR NAR P-AN N-AN BS BS BS report C/I estimates pilot channel “Handover assist information”

  4. Predictive fast handover MN (P-AN) (N-AN) PAR NAR (Report estimate) (one example of triggering) (HO indication) RtSolPr[MN-LLA, NewAP-LLA] PrRtAdv HI FBU FBAck HAck Dest:NCoA buffering forwarding handover Traffic CH assignment Search for a buffer for NCoA and deliver packets in it Link-layer connection establishment+bootstrapping FNA? delivery data

  5. Issues and possible solutions (1) • NAR is resolved by PAR with the New AP LLA • In 3G networks, New AP LLA is not used • Handover assist information should be used • The length of the LLA Option is in units of 8 octets • Length of handover assist information may be information-specific-> the LLA option needs extension... • New Option-Code is defined in the LLA option to convey handover assist information 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | Option-Code | LLA... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  6. Issues and possible solutions (2) • How FNA should be implemented? • PPP replaces FNA (FNA elimination) • Always checks if buffer exists • New IPCP option for FNA (L2 implementation ) • Checks if buffer exists when this option is received • FNA in RFC4068 is used (standard FNA)

  7. Reactive fast handover • Reactive mode may be more realistic when it is difficult to identify NAR in advance • Reactive mode may cause more packet loss • Optionally, PAR may buffer packets to offer loss less handover • FBU or lower-layer signaling can be used to trigger buffering

  8. Sequence of the reactive mode MN PAR NAR RtSolPr PrRtAdv Dest:PCoA FBU / Lower-layer signaling buffering handover Link-layer connection establishment+bootstrapping 3 ways to implement FNA[FBU] / FBU FBU HI Search for a buffer for PCoA and forward packets in it HAck FBAck forwarding data

  9. Selective bi-casting HA • Following cases are considered: • multiple/single IF(s) • bicasting at PAR/HA • Use cases for 4 combinations and details are illustrated PAR NAR BS BS MN

  10. Summary • Implement fast handovers in 3G CDMA networks • specify information that can be used as handover assist information • define mechanism to determine NAR from handover assist information • enhancing reactive fast handover • optimizing performance by buffering and bi-casting

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