Context filter in a mobile node

• US 20030126290A1
• Filed: 12/02/2002
• Published: 07/03/2003
• Est. Priority Date: 12/03/2001
• Status: Abandoned Application

• Current Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Original Assignee: Nokia Solutions and Networks US LLC (Nokia Corporation)
• Inventors: Lakshmi Narayanan, Ram Gopal, Li, Man
• Application Number:
  US10/309,365
• Publication Number:
  US 20030126290A1
• Time in Patent Office: Days
• US Class Current: 709/242
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/24 Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 40/36 due to handover
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 92/24 between backbone network devices

Abstract

In mobile IP networks, when a mobile node (MN) moves from one cell to another, handover occurs. The result of the handover is that the MN connects to the network through a new access router (AR). The handover may occur between access routers of the same or different administrative domains. In all cases, the information related to the mobile node has to be transferred from the old AR to the new AR in order to minimize the effect of the change of access routers. This is the so-called context transfer.

Claims

1. A method for forwarding a packet of a mobile node, said mobile node in communication with an access router, said mobile node having a current working set and said access router having at least one capability comprising the steps of:

providing the packet to a protocol stack;

consulting a context filter;

applying at least one context filter rule based on the current working set; and

forwarding the packet based on at least one capability.

2. The method for forwarding a packet of claim 1 further comprising the step of:

creating a context working set filter prior to the step of providing the packet to a protocol stack.

3. The method for forwarding a packet of claim 2 further comprising the step of:

updating a mobile node servicing profile prior to the step of creating a context working set filter.

4. A method for forwarding a packet of a mobile node, said mobile node in communication with an access router, said mobile node having a current working set comprising the steps of:

starting an application;

consulting a context filter;

applying at least one context filter rule based on the current working set; and

generating an error provided that the at least one context filter rule is not met.

5. The method of forwarding of claim 4 further comprising the step of initiating a session.

6. The method of forwarding of claim 5 further comprising the step of giving up.

7. The method of forwarding of claim 4 wherein the step of generating an error comprises the step of generating an ICMP error.