1. with distributed anchor routers
Vancouver, November 2005
IETF 64th – netlmm BOF
NETLMM
with distributed anchor routers
draft-giaretta-netlmm-protocol-00
Gerardo Giaretta
Ivano Guardini
Elena Demaria

2. Purpose of the draft
Network-based LMM protocol that fulfills the requirements of draft-kempf-netlmm-nohost-req
Main requirements considered in the design
Req#2: Reduction in handover-related signaling volume
Req#4: Efficient use of wireless resources (minimization of per packet overhead over the air interface)
Req #5: Reduction of signaling and packet overhead in the wired network
The purpose is to use this protocol as the basic core network mobility management mechanism for 3GPP Long Term Evolution network (i.e. 4G)

3. Main Features (1)
MN keeps the same IP address while moving in the same NETLMM Domain
same prefixes are not advertised by different ARs
simplification of distributed anchor points allocation
a solution similar to landmark DNA may be used to let MN keep the same IP address
Protocol architecture similar to Mobile IPv6
the visited AR sends a Location Update message to the Home Anchor Router (HAR) of the MN when the MN attaches on the link
HAR mantains a Location Cache which stores current position of the MN in terms of the AR it is attached to (IP-MN, IP-AR)
HAR acts as a Mobility Anchor Point for MN
each AR implements a Location Update List that contains one entry for each MN attached on the related link

4. Main features (2) MN is identified by the IP address
CGAs may be used to avoid address ownership issues
Flexibility in MAP allocation
may be an aggregation router
to improve location privacy (e.g. upon user request)
may be co-located with Access Routers
optimized support for sensors or “users” with minimal movement ability
AR may span a large area (similar to a MSC area)
Multiple MAPs located in a NETLMM Domain
needed to have a scalable solution and load balance among them
In the draft also
some considerations on MN-AR interface
some ideas about Route Optimization

5. Routing of data packets
Standard IP
Routing
Tunneling
Edge mobility
Domain
Edge mobility
Domain
AR1
AR2
AR3
HAR
for MN
AR1 CN
AR2
AR3
HAR
for MN MN
IP addr = IPMN CN MN
IP addr = IPMN
HAR – Home Anchor Router acts as Mobility Anchor Point for the MN