Method of performing handoff in wireless asynchronous transfer mode network

• US 7,502,346 B2
• Filed: 12/27/2002
• Issued: 03/10/2009
• Est. Priority Date: 12/29/2001
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Sang Youn
• Primary Examiner(s): Pham; Chi H.
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US10/329,410
• Publication Number:
  US 20030125029A1
• Time in Patent Office: 2,265 Days
• Field of Search: 370/328, 370/329, 370/331, 370/332, 370/333, 370/334, 370/395.1, 370/395.51, 370/395.52, 370/395.53, 370/310.1, 370/310.2, 455/436, 455/437, 455/438, 455/439, 455/442, 455/443, 455/444
• US Class Current: 370/331
• CPC Class Codes: H04L 2012/5607 Radio
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node

Abstract

Disclosed is a handoff method in a wireless ATM network. A method of performing a handoff in a network system having a first server managing a first area including a portion of first subcells of a first cell, and a second server managing a second area including another portion of the first subcells, comprises the steps of requesting, at the first server, for setting up a new communication path for a terminal which moves from the first area to the second area, setting up the new communication path at the second server, and performing a first handoff between the servers using the set-up communication path.

Claims

1. A method of performing a handoff in a wireless asynchronous transfer mode (WATM) network, comprising:

dividing a network configuration into an intra domain having an intra domain server for processing the handoff inside a cell and an inter domain having an inter domain server for connecting subcells located on a bound area between the cell and the another cell;

connecting the subcells to form one cell by the inter domain server;

transmitting a re-routing path setup request message from the intra domain server to the inter domain server when an additional procedure for one crust cell is completed according to a moving path of a terminal;

after the inter domain server performs an ATM path setup procedure for the added crust cell, transmitting a re-routing path setup completion acknowledgement message to the intra domain server; and

performing a soft handoff as the terminal successively moves through the inter domain region.

2. The method of claim 1, wherein the inter domain server is arranged in a subcell region, and the intra domain server is arranged in a core cell region excluded from the subcells among the cell.

3. A method of performing a handoff in a wireless asynchronous transfer mode (WATM) network including a first intra domain region having a first intra domain server, a second intra domain region having a second intra domain server, and a second inter domain region having a second inter domain server, comprising:

connecting crust cells to form one cluster at the inter domain server;

adding a first crust base station according to a request of a terminal at the first intra domain server;

transmitting a first re-routing path setup request message to the inter domain server for the handoff between the domain servers at the first intra domain server;

setting the re-routing path to support the handoff without interruption at the inter domain server;

transmitting a re-routing path setup completion acknowledgement message to the first intra domain server at the inter domain server;

setting the re-routing path to support the handoff without interruption at the inter domain server; and

performing a soft handoff as the terminal successively moves through the inter domain region.

4. The method of claim 3, wherein the first re-routing path setup message is transmitted to the inter domain server after the handoff procedures between a core cell region and in a crust cell region are performed.

5. The method as claimed in claim 3, wherein the inter domain server is arranged in a crust cell region, and the intra domain servers are arranged in a core cell region.