Mobile IPv6 Fast Handovers for 3G CDMA Networks

Hidetoshi Yokota KDDI Lab

Gopal Dommety Cisco

<draft-yokota-mipshop-3gfh-02.txt>

65th IETF MIPSHOP WG

2

Focus of this I-D

Implement fast handovers in 3G CDMA networks Adaptation of FMIPv6 (RFC4068) to 3G CDMA networks FMIPv6 extensions Clarifications

Link-layer connection in the new network can be simplified by introducing FMIPv6 bootstrapping parameters can be obtained in FMIPv6 operation

Selective bi-casting is considered multiple/single IF(s) bicasting at PAR/HA

3

Handover trigger & information in 3G CDMA networks Available information

for the target network pilot channels cell information serving nodes location of BS or MN

3G core network

NARPAR

BS BS

MN

“Handover assist information”

BS

P-AN N-AN

report C/I estimates

pilot c

hannel

pilot c

hannel

4

Issues and possible solutions (1)

The FBU may be delayed and the MN gets to the NAR before the handover is detected bi-casting does not solve this situation

it is more effective in the predictive mode

If the predictive mode is failed, it falls back to the reactive mode (Sec 3.2 #2 in RFC4068) a delayed FBU was not well taken into consideration

in the previous (-01) I-D

5

Delayed FBU (case 1)MN PAR NAR

FBAck

HI (Code:1)

HAck

forwarding

RtSolPrPrRtAdv

handover

FNA[nFBU]

Link-layer connection establishment+bootstrapping

P-AN

discardreactivemode

nFBU

(1)

(2)

(3)

pFBU

pFBU: transmitted in the previous networknFBU: transmitted in the new network

pFBU: transmitted in the previous networknFBU: transmitted in the new network

6

Delayed FBU (case 2)MN PAR NAR

pFBU

FBAck

HI (Code:1)

HAck

forwarding

RtSolPrPrRtAdv

handover

FNA[nFBU]

nFBU

Link-layer connection establishment+bootstrapping

HI (Code:0)HAck (reject; Code:128-130)

P-AN

reactivemode

addressvalidity checkreactive

mode

(1)

(2)

(3)

7

Delayed FBU (case 3)MN PAR NAR

pFBU

forwarding

RtSolPrPrRtAdv

handover

FNA[nFBU]

Link-layer connection establishment+bootstrapping

P-AN

HI (Code:0)HAck (accept)FBAck

reactivemode

reactivemode

predictivemode

accept FNA

ignore nFBU

(1)

(2)

(3)

addressvalidity check

8

Issues and possible solutions (2)

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 In the last l-D, a new option-code in the LLA option was

defined New Option is defined to convey handover assist

information

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New option for vendor-specific handover 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 | VS-Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | VS-Value... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Type T.B.D.

Length The size of this option in 8 octets including the Type, Length, Option-Code and VS-Length fields.

Option-Code Indicates the particular type of vendor-specific information. This value is administrated by the vendor or organization that uses this option.

VS-Length The size of the VS-Value field in octets.

VS-Value Zero or more octets of vendor-specific information data.

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Summary of primary changes from -01 draft Consideration of delayed FBU

When HI arrives at the NAR before FNA [FBU], it should behave as the predictive mode

otherwise, it should behave as the reactive mode

New option to convey handover assist information is defined instead of extending LLA option