Apparatus for supporting the handover of a telecommunication session between a licensed wireless system and an unlicensed wireless system

• US 7,308,263 B2
• Filed: 09/20/2002
• Issued: 12/11/2007
• Est. Priority Date: 02/26/2001
• Status: Expired due to Term

• Current Assignee: Ribbon Communications Operating Company, Inc. (Ribbon Communications, Inc.)
• Original Assignee: Kineto Wireless Incorporated (Ribbon Communications, Inc.)
• Inventors: Mohammed, Jahangir, Gallagher, Michael D.
• Primary Examiner(s): LE, DANH C
• Application Number:
  US10/251,901
• Publication Number:
  US 20040192211A1
• Time in Patent Office: 1,908 Days
• Field of Search: 455/437, 455/436, 455/502, 455/444, 455/552.1, 455/439, 455/438, 370/331, 370/330, 370/334, 370/333, 370/338, 709/328
• US Class Current: 455/439
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04L 63/0869 for achieving mutual authentication cryptographic mechanisms or cryptographic arrangements for mutual authentication H04L9/3273
• CPC Class Codes: H04M 3/42246 where the subscriber uses a multi-mode terminal which moves and accesses different networks with at least one network having a wireline access including cordless PBX
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/16 for PBS [Private Base Station] arrangements
• 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
• CPC Class Codes: H04W 36/1446 wherein at least one of the networks is unlicensed
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 4/16 Communication-related supplementary services, e.g. call-transfer or call-hold
• CPC Class Codes: H04W 8/12 between location registers or mobility servers

Abstract

The invention discloses a wireless communication handset comprising licensed wireless communication signal processing circuitry and unlicensed wireless communication signal processing circuitry. The invention further discloses a control circuit connected to both the licensed wireless communication signal processing circuitry and the unlicensed wireless communication signal processing circuitry, and a computer readable memory for directing the control circuit to function in a specified manner. This memory includes instructions to formulate a measurement report containing signal strength information that corresponds to the strength of a signal received through the unlicensed wireless communication signal processing circuitry. The measurement report also contains a request to transfer a wireless communication session from a licensed wireless system to an unlicensed wireless system. The memory further includes instructions to transmit the measurement report to the licensed wireless system through the licensed wireless communication signal processing circuitry.

Claims

1. A method for performing a handover of a communication session from a licensed wireless communication system to an unlicensed licensed wireless communication system, the method comprising:

a) establishing a communication session with a mobile station using the licensed wireless system servicing a licensed wireless system service area;

b) establishing a connection between the mobile station and the unlicensed wireless communication system through an indoor system server;

c) sending a measurement report from the mobile station to the licensed wireless communication system, wherein the measurement report includes an Absolute Radio Frequency Channel Number (ARFCN) that is associated with the unlicensed wireless communication system and an indication that a cell associated with the unlicensed wireless communication system has a maximum signal quality;

d) receiving a command at the mobile station from the licensed wireless communication network indicating that a handover is required;

e) sending a handover access message by the mobile station; and

f) receiving the handover access message at the indoor system server.

2. The method of claim 1, further comprising:

initiating traffic channel assignment utilizing the indoor system server.

3. The method of claim 2, further comprising:

a) sending a handover complete indication from the mobile station;

b) receiving the handover complete indication at the indoor system server;

c) sending a handover detect message from the indoor system server to the licensed wireless communication system; and

d) sending a handover complete message from the indoor system server to the licensed wireless communication system.

4. The method of claim 1, wherein said maximum signal quality is indicated by setting a value of 63 for the receiving level.

5. The method of claim 1, further comprising:

a) after establishing said connection between the mobile station and the unlicensed wireless communication system, sending a registration request from the mobile station;

b) receiving said registration request at the indoor system server.

6. The method of claim 3, further comprising:

a) sending a registration acknowledgement from the indoor system server;

b) receiving the registration acknowledgement at the mobile station.

7. An indoor system server to operate in an unlicensed wireless communication system, the indoor system server comprising:

a) a first network interface for communicating with the Internet;

b) a second network interface via which messages are to be transmitted to an from a mobile station via an indoor base station communicatively coupled between the mobile station and the indoor system server;

c) a third network interface, via which the network controller may be connected to a telecommunications network employed by a licensed wireless communication system comprising a mobile switching center (MSC);

d) circuits for handling a set of messages transmitted over the second interface to support handover of a mobile station communication session from the licensed wireless communication system to the unlicensed wireless communication system, wherein the set of messages includes;

i) a measurement report sent form the mobile station to the licensed wireless communication system, wherein the measurement report includes an Absolute Radio Frequency Channel Number (ARFCN) that is associated with the unlicensed wireless communication system and an indication that a cell associated with the unlicensed wireless communication system has a maximum signal quality; and

ii) a handover access message sent from the mobile station and received at the indoor system server.

8. The indoor system server of claim 7, further comprising:

circuits for initiating a traffic channel assignment.

9. The indoor system server of claim 8, further comprising:

a) circuits for sending a handover detect message to the licensed wireless communication system; and

b) circuits for sending a handover complete message to the licensed wireless communication system.

10. The indoor system server of claim 7 further comprising:

circuits for receiving a registration request sent from the mobile station.

11. The indoor system server of claim 10, further comprising:

circuits for sending a registration acknowledgement to the mobile station.

12. The indoor system server of claim 7, wherein said set of messages further includes a plurality of messages for initiating traffic channel assignment.

13. The indoor system server of claim 7, wherein said set of messages further includes:

a) a handover detect message sent to the licensed wireless communication system; and

b) a handover complete message sent to the licensed wireless communication system.

14. The indoor system server of claim 7, wherein said set of messages further includes a registration request received at the indoor system server sent from the mobile station.

15. The indoor system server of claim 7, wherein said set of messages further includes a registration acknowledgement message sent to the mobile station.

16. A machine readable medium comprising a set of instructions, which when executed by an indoor system server through which a mobile stations has connection to an unlicensed wireless communication system, causes the indoor system server to facilitate a handover of a mobile station communication session from a licensed wireless communication system to the unlicensed wireless communication system, by performing operations including:

a) establishing a connection between the mobile station and the unlicensed wireless communication system through the indoor system server, and

b) sending a measurement report from the mobile station to the licensed wireless communication system, wherein the measurement report includes an Absolute Radio Frequency Channel Number (ARFCN) that is associated with the unlicensed wireless communication system and an indication that a cell associated with the unlicensed wireless communication system has a maximum signal quality; and

c) receiving a handover access message at the indoor system server.

17. The machine readable medium of claim 16, further comprising instructions that allow the indoor system server to perform operations including:

initiating traffic channel assignment.

18. The machine readable medium of claim 17, further comprising instructions that allow the indoor system server to perform operations including:

a) receiving an assignment complete message;

b) sending a handover detect message to the licensed wireless communication system; and

c) sending a handover complete message to the licensed wireless communication system.