Handover Between Wireless Cellular Network and Private Network in Wireless Communications

• US 20080318576A1
• Filed: 06/20/2008
• Published: 12/25/2008
• Est. Priority Date: 06/20/2007
• Status: Abandoned Application

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Chow, Jerry Pak Lup, So, Tricci
• Application Number:
  US12/143,728
• Publication Number:
  US 20080318576A1
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/0066 of control information between different types of networks in order to establish a new radio link in the target network

Abstract

Techniques and systems for performing handover of a mobile station between a cellular wireless network and a private cell or private network.

Claims

1. A method for handling handover between a cellular wireless network and a private wireless network, comprising:

providing the cellular wireless network with information on access to one or more private wireless networks granted to a mobile station that is subscribed to the cellular wireless network and is being served by a cell of the cellular wireless network, wherein each of the one or more private wireless networks provides wireless access for a subset of all users subscribed to the cellular wireless network;

operating the cellular wireless network to obtain mapping information between the serving cell in the cellular wireless network and radio cells in the one or more private wireless networks to which the mobile station is granted access; and

selecting radio cells in the one or more private wireless networks as candidate radio cells for handover of the mobile station from the serving cell in the cellular wireless network to one of the selected radio cells of the one or more private wireless networks.

2. The method as in claim 1, comprising:

applying a selection condition to select one radio cell from the candidate radio cells as a target radio cell for the handover; and

performing handover of the mobile station from the cellular wireless network to the selected one target radio cell.

3. The method as in claim 2, comprising:

measuring signal qualities of wireless links between the mobile station and radio cells in the one or more private wireless networks to which the mobile station has access and that are adjacent to the serving cell of the cellular wireless network; and

using the measured signal qualities to select the candidate radio cells for handover of the mobile station.

4. The method as in claim 3, wherein:

a received signal strength and a carrier to interference and noise ratio are measured to represent a signal quality of a wireless link between the mobile station and a radio cell in the one or more private wireless networks.

5. The method as in claim 1, wherein:

the information on access to one or more private wireless networks granted to the mobile station that is being served by the cell of the cellular wireless network comprises a list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network.

6. The method as in claim 5, comprising:

providing the list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network as part of a handover context information package for the mobile station which previously handovers from a prior serving cell in the cellular wireless network to the serving cell that currently serves the mobile station.

7. The method as in claim 5, wherein:

operating the serving cell to obtain the list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network from another entity in the cellular wireless network.

8. The method as in claim 5, comprising:

accessing a base station of the serving cell to obtain the list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network from another entity in the cellular wireless network.

9. The method as in claim 8, comprising:

when the base station of the serving cell does not have any entry in the list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network, accessing another entity in the cellular wireless network for the list.

10. The method as in claim 1, comprising:

storing in the mobile station a list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network.

11. The method as in claim 10, comprising:

operating the mobile station to initiate a scanning of cells on the list of cells in the one or more private wireless networks that are neighbors of the serving cell for the mobile station in the cellular wireless network to determine signal qualities of wireless links with cells in the list.

12. The method as in claim 11, comprising:

operating the mobile station to evaluate measurements of signal qualities of the wireless links with cells on the list and to select one or more candidates for a target radio cell in the list for the handover.

13. The method as in claim 12, comprising:

operating the mobile station to communicate to the serving cell in the cellular wireless network the selected one or more candidates for the target radio cell in the list for the handover.

14. The method as in claim 10, comprising:

storing a handover policy in the mobile station.

15. The method as in claim 1, comprising:

providing the cellular wireless network with a list of neighboring cells for cells in the cellular wireless network that is separate from the information on access to one or more private wireless networks granted to the mobile station that is being served by the cell of the cellular wireless network in the mobile station;

performing a handover from the serving cell in the cellular wireless network to another cell in the cellular wireless network based on the list of neighboring cells for cells in the cellular wireless network; and

performing a handover from the serving cell in the cellular wireless network to a cell in the one or more private wireless networks based on the information on access to one or more private wireless networks granted to the mobile station that is being served by the cell of the cellular wireless network in the mobile station, without relying on the list of neighboring cells for cells in the cellular wireless network.

16. A wireless communication system, comprising:

a cellular wireless network comprising a plurality of cells with base stations to provide wireless access to subscribed mobile stations, the cellular wireless network comprising a list of neighboring cells for cells in the cellular wireless network;

a private wireless network comprising one or more private cells to provide wireless access to a subset of the subscribed mobile stations in the cellular wireless network;

a mechanism to obtain mapping information between a serving cell in the cellular wireless network for a mobile station and radio cells in the private wireless network to which the mobile station is granted access;

a first handover mechanism to perform a handover from the serving cell in the cellular wireless network to another cell in the cellular wireless network based on the list of neighboring cells for cells in the cellular wireless network; and

a second handover mechanism to perform a handover from the serving cell in the cellular wireless network to a cell in the one or more private wireless networks based on the information on access to one or more private wireless networks granted to the mobile station that is being served by the cell of the cellular wireless network in the mobile station, without relying on the list of neighboring cells for cells in the cellular wireless network.

17. The system as in claim 16, comprising:

a mechanism to select radio cells in the one or more private wireless networks as candidate radio cells for handover of the mobile station from the serving cell in the cellular wireless network to one of the selected radio cells of the private wireless network;

a mechanism to applying a selection condition to select one radio cell from the candidate radio cells as a target radio cell for the handover; and

a mechanism to perform handover of the mobile station from the cellular wireless network to the selected one target radio cell.

18. A wireless communication system, comprising:

a cellular wireless network comprising a plurality of cells with base stations to provide wireless access to subscribed mobile stations, the cellular wireless network comprising a list of neighboring cells for cells in the cellular wireless network;

a private wireless network comprising one or more private cells to provide wireless access to a subset of the subscribed mobile stations in the cellular wireless network;

a mechanism to obtain mapping information between a serving cell in the cellular wireless network for a mobile station and radio cells in the private wireless network to which the mobile station is granted access; and

a mechanism to select radio cells in the one or more private wireless networks as candidate radio cells for handover of the mobile station from the serving cell in the cellular wireless network to one of the selected radio cells of the private wireless network.

19. The system as in claim 18, comprising:

a mechanism to apply a selection condition to select one radio cell from the candidate radio cells as a target radio cell for the handover; and

a mechanism to perform handover of the mobile station from the cellular wireless network to the selected one target radio cell.

20. The system as in claim 19, wherein:

the information on access to the private wireless network granted to the mobile station that is being served by the cell of the cellular wireless network comprises a list of cells in the private wireless network that are neighbors of the serving cell for the mobile station in the cellular wireless network.

21. The system as in claim 19, wherein:

the cellular wireless network comprises macrocells, and at least one of a microcell located in a macrocell, or a picocell located in a macrocell.