1. Mobile IPv6 Fast Handovers for 3G CDMA Networks
<draft-ietf-mipshop-3gfh-01.txt>
Hidetoshi Yokota KDDI Lab
Gopal Dommety Cisco
67th IETF MIPSHOP WG

2. Changes from -00 draft
A new fast handover sequence is added to align with 3GPP2 FHO work
Additional message types are defined
Security consideration is added
Additional handover information (aka “context”) can be exchanged during the handover signaling phase
Additional option is defined
67th IETF MIPSHOP WG

3. Fast handover types Predictive fast handover Reactive fast handover
2018/5/30
Fast handover types
Predictive fast handover
Reactive fast handover
to apply RFC4068 to 3GPP2 fast handover procedures
Network-controlled fast handover
based on and to apply to “fast handover for HRPD (3GPP2 X.P0043)”
67th IETF MIPSHOP WG

4. Network-controlled fast handover
The lower layer can provide necessary information for handover and support handover triggering
MN is not explicitly involved with fast handover
Two handover options
Immediate fast handover
Delayed fast handover
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5. Immediate fast handover
raw packet
processed packet MN
P-AN
N-AN
PAR
NAR HA
AAA
MN-AAA sec.
MN-AAA sec.
Link-layer connection (PPP)
Access-request (PMIP-supported)
Access-accept (Root Key)
PCoA
Root Key
BU (MN-AAA Auth)
Access-Req/Accept BA
Root Key
packet (dst:PCoA)
A16-HO Req/Initiate (PAR)
A11-RRQ/RRP (Flow ID, PAR)
HO Request (Flow ID, CID, GRE key)
HO Response (Context, GRE key, Root Key, Immediate)
Root Key
[buffering]
67th IETF MIPSHOP WG

6. Immediate fast handover (cont’d)
raw packet
processed packet MN
P-AN
N-AN
PAR
NAR HA
AAA
[buffering]
movement
packet (dst:PCoA)
A11 (Active Start Airlink Record)
(PPP setup is not needed)
Context install complete
Proxy BU (HoA, NAR, MN-AAA-Auth)
Access-Req/Accept
Proxy BA
packet (dst:NAR)
PPP IPv6CP + RA (NCoA assignment)
NCoA
BU (HoA, NCoA, MN-AAA Auth)
Access-Req/Accept BA
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packet (dst:NCoA)

7. Delayed fast handover MN P-AN N-AN PAR NAR HA AAA MN-AAA sec.
raw packet
processed packet MN
P-AN
N-AN
PAR
NAR HA
AAA
MN-AAA sec.
MN-AAA sec.
Link-layer connection (PPP)
Access-request (PMIP-supported)
Access-accept (Root Key)
PCoA
Root Key
BU (MN-AAA Auth)
Access-Req/Accept BA
Root Key
packet (dst:PCoA)
A16-HO Req/Initiate (PAR)
A11-RRQ/RRP (Flow ID, PAR)
HO Request (Flow ID, CID, GRE key)
HO Response (Context, GRE key, Root Key, Delayed)
Root Key
[buffering]
67th IETF MIPSHOP WG

8. Delayed fast handover (cont’d)
Appendix 2/2
2018/5/30
Delayed fast handover (cont’d)
raw packet
processed packet MN
P-AN
N-AN
PAR
NAR HA
AAA
[buffering]
movement
A11 (Active Start Airlink Record)
packet (dst:PCoA)
(PPP setup is not needed)
Context install complete
HO Ack
(trigger to handover)
Proxy BU (NCoA, HoA, MN-AAA-Auth)
Access-Req/Accept
Proxy BA
packet (dst:NAR)
PPP IPv6CP + RA (NCoA assignment)
NCoA
BU (MN-AAA Auth)
Access-Req/Accept BA
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packet (dst:NCoA)

9. Combined handover procedure
MN P-AN N-AN PAR NAR HA AAA
| |HO initiation | | | |
(a) | | >| | | | |
| | |AN-AR connection establishment |
(b) | | |/ \| | |
| | |\ /| | |
| | | | HReq | | |
(c) | | | |< | | |
| | | | HRes | | |
(d) | | | | >| | |
| | | | HAck | | |
(e) | | | |< | | |
| | | |forward packets | |
(f) | | | |========>| | |
| | | | | |
| | | | | buffering | | |
handover | | | | | |
|radio-link conn. est. & AN-AR conn. activation | |
(g) |/ \|/ \| | |
|\ /|\ /| | |
| | deliver packets | | | |
(h) |<========================================| | |
| | | | | BU | |
(i) | | | | | >| |
| | | | | | Auth. |
(j) | | | | | |< >|
| | | | | BA | |
(k) | | | | |< | |
(l) |<========================================|<=======| |
| | IPv6CP + RA | | | |
(m) |< >| | |
| | | BU/BA | | | Auth. |
(n) |< >|< >|
| | | | | | |
67th IETF MIPSHOP WG

10. Differences in message type
3GPP2
(X.P0043)
direction
FMIPv6 (RFC4068)
HO_Request
PAR<-NAR
(none)
HO_Response
PAR->NAR
HO_Update HI
HO_Update_Ack
HAck
HO_Ack
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11. Additional messages Handover Request (HReq) NAR -> PAR
Valid option: CVSE/NVSE (RFC3115) [type=38/124]
To request contexts
| Type | Code | Checksum |
| Subtype | Reserved | Identifier |
| Options ...
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12. Additional messages (cont’d)
Handover Response (HRes)
PAR -> NAR
I flag: immediate (1)/delayed (0)
Valid option: CVSE/NVSE (RFC3115) [type=38/124]
To send requested contexts
| Type | Code | Checksum |
| Subtype |I| Reserved | Identifier |
| Options ...
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13. Summary of change
“Network-controlled fast handover” is added to align with 3GPP2 FHO work
AR-originated BU/AR-terminated BA functionality is added
Limited to fast handover phase
Security consideration is added
Additional messages/option are added
Handover Request (HReq)/Handover Response (HRes)
Vendor specific extension (RFC3115) can be attached as an option to convey contexts
67th IETF MIPSHOP WG

14. Next steps Tighter liaison between 3GPP2 and IETF
More feedback from 3GPP2
Keep track of 3GPP2/IETF work
Current 3GPP2 FHO work includes network-based mobility management feature, which is on-going work in IETF
The I-D will incorporate the results to get in sync and go forward
67th IETF MIPSHOP WG