×

Micromobility using multicast

  • US 6,804,221 B1
  • Filed: 06/26/2000
  • Issued: 10/12/2004
  • Est. Priority Date: 06/26/2000
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for registering a mobile node to enable multicasting an internet protocol (IP) message in a wireless network having multiple domains, wherein each domain includes a main access router attached to a plurality of base station routers, and wherein each base station router is connected to one or more base stations for communicating with mobile stations in a coverage area of the base station router, comprising the steps of:

  • receiving by the base station router a neighbor update extension message from an adjacent base station router in the first domain, wherein the neighbor update extension message includes information on mobile nodes with entries in the binding cache of the adjacent base station router;

    creating an entry in a probable cache for each mobile node listed in the neighbor update extension message;

    receiving by a base station router in a first domain a mobile node advertisement message, wherein the mobile node advertisement message is transmitted by a base station in a coverage area of the base station router to inform the base station router of a mobile node entering its coverage area;

    receiving by the base station router a mobile IP registration request, wherein the mobile IP registration request includes information on a request to access the wireless network by the mobile node entering the coverage area of the base station router, and wherein the mobile node is not in its home network;

    in response to receiving the mobile node advertisement message or the mobile IP registration request, searching by the base station router, the probable cache for an entry for the mobile node requesting access to the wireless network;

    in response to determining no entry in the probable cache for the mobile node, performing the following steps;

    appending an IP address of the base station router in a BSR extension to the mobile IP registration request;

    transmitting by the base station router the mobile IP registration request with the BSR extension to the main access router in the fist domain;

    receiving a mobile IP registration reply from the main access router, wherein the mobile IP registration reply has a multicast address extension for providing a multicast address assigned to the mobile node;

    creating an entry in a binding cache of the base station router having information on the mobile node and assigned multicast address extension and deleting any entry for the mobile node in the probable cache; and

    removing the multicast address extension from the mobile IP registration reply and forwarding a registration reply to the mobile node.

View all claims
  • 11 Assignments
Timeline View
Assignment View
    ×
    ×