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

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)

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

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

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