US 8,077,648 B2Granted

VRM selection

AssigneeTelefonaktiebolaget LM Ericsson (publ)

InventorsAndras Valko, Zoltan Turanyi, Csaba Keszei, Atsushi Iwasaki, Katsutoshi Nishida

Life of this patent

Estimating the term…

Loading patent…

Abstract

There are provided a method, a network system, and a router capable of decreasing the chance of VRM or VLM changes so as to reduce signaling, and consequently contributing to better scalability. The method is applied to mobility management used in an IP-based network system, which contains a plurality of access routers (AR), location managers (LM) and routing managers (RM), through which a mobile node (MN) transmits and receives information. According to the method, a visited routing manager (VRM) where the MN is currently located monitors the MN, an AR currently communicating with the MN discriminates whether or not the MN is moving out of its connectivity range, and the VRM discriminates whether or not the MN is moving out of its control range. Then, the method switches mobility management over from the current AR to a new AR in accordance with the discrimination results, and switches mobility management over from the current VRM to a new VRM in accordance with the discrimination result.

Claims12

Dependent claims

A method for mobility management used in an IP-based network system, which contains a plurality of access routers (AR), location managers (LM) and routing managers (RM), through which a mobile node (MN) transmits and receives information, the method comprising the steps of:

determining whether or not the mobile node is active;
monitoring the mobile node via a visited routing manager (VRM) where the mobile node is currently located if the mobile node is active;
first determining whether or not the mobile node is moving out of a connectivity range from one of the plurality of access routers which is currently communicating with the mobile node, wherein the plurality of access routers is grouped into regions, each region having two or more access routers which select the same visited routing manager for the same mobile node;
second determining whether the mobile node is moving out of a control range of the visited routing manager (VRM) which is currently managing the mobility of the mobile node;
transferring context which the current access router holds to a new access router in a case where it is determined at said first and second determining steps that the mobile node is moving out of the connectivity range from the access router but is still within the control range of the current visited routing manager;
and
transferring context which the current visited routing manager holds to a new visited routing manager under an assist by a home routing manager (HRM) in a case where it is determined at said first and second determining steps that the mobile node is moving out of the connectivity range from the access router and the control range of the current visited routing manager.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/376,936Filed 9 Aug 2006
Published: US 2010/0182960 A122 Jul 2010
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H04W 8/08
Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of…:…
H04W 80/04
Wireless network protocols or protocol adaptations to wireless operation: network layer protocols, e.g. mobile IP [Internet Protocol]
H04W 80/10
Upper layer protocols: adapted for application session management, e.g. SIP [Session Initiation Protocol]
H04W
Wireless communication networks