Method of performing handoff in wireless asynchronous transfer mode network

• US 20030125029A1
• Filed: 12/27/2002
• Published: 07/03/2003
• Est. Priority Date: 12/29/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Sang Youn
• Granted Patent: US 7,502,346 B2
• Time in Patent Office: Days
• US Class Current: 455/444
• 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 network structure, comprising;

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 and a portion of second subcells of a second cell.

2. The network structure of claim 1, each of the first server and the second server, comprising:

an asynchronous transmission mode switch for establishing a communication path for each of the cells.

3. The network structure of claim 1, wherein the first area and the second area is not overlapped.

4. A network structure, comprising;

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 and a portion of second subcells of a second cell, wherein handoffs are performed between the subcells of the areas and between the servers.

5. The network structure of claim 4, each of the first server and the second server further comprising:

an asynchronous transmission mode switch for establishing a communication path to support the handoff between the servers.

6. 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, comprising:

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.

7. The method of claim 6, the requesting step further comprising the step of:

performing a second handoff between the subcells of the areas according to a request of the terminal and then requesting for setting up the new communication path.

8. 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, each of the first sever and the second server includes asynchronous transmission mode (ATM) for establishing a communication path of each cell, comprising:

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, at the second server, the new communication path using a corresponding ATM switch; and

performing a first handoff between the servers using the set-up communication path.

9. The method of claim 8, the requesting step further comprising;

performing a second handoff between the subcells of the areas according to a request of the terminal and then requesting for setting up the new communication path.

10. 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 another cell;

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

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

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.

11. The method of claim 10, 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.

12. 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.

13. The method of claim 12, 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.

14. The method as claimed in claim 12, wherein the inter domain server is arranged in a crust cell region, and the intra domain servers are arranged in a core cell region.