Method and apparatus for handoff between a wireless local area network (WLAN) and a universal mobile telecommunication system (UMTS)

• US 9,237,503 B2
• Filed: 03/16/2012
• Issued: 01/12/2016
• Est. Priority Date: 07/02/2002
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Shaheen, Kamel M., Kiernan, Brian G.
• Primary Examiner(s): Gelin, Jean
• Application Number:
  US13/422,578
• Publication Number:
  US 20120178441A1
• Time in Patent Office: 1,397 Days
• Field of Search: 455/436, 455/437, 455/438, 455/439, 455/444, 455/454, 455/422.1, 455/445, 455/426.1, 455/552.1, 455/553.1, 455/168.1, 370/252, 370/320, 370/328, 370/331, 370/332, 370/338, 370/412, 370/466, 370/470, 709/205, 709/227, 709/235
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0083 Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/24 Reselection being triggered by specific parameters
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 8/18 Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Apparatus and method for providing an automatic handoff process of a dual-mode user equipment (UE) from either a wireless local area network (WLAN) to a universal mobile telecommunications system (UMTS) or from a UMTS to a WLAN. Handoffs may be initiated by the UE, based upon user preference, signal quality, comparison of location coordinates of the UE and the system to be switched to or signal quality. The available channels of one system may be sent to the UE by the other system or the UE may monitor channels of the system to be switched to and lock on to one. The handoff may also be initiated by the UMTS, the selection being power-based.

Claims

1. A method for use in a user equipment (UE), the method comprising:

the UE communicating data via a cellular access network using a first Internet Protocol (IP) address;

the UE sending a request message via the cellular access network, the request message indicating a request for location information related to access networks available for handoff;

the UE receiving a network information message via the cellular access network, wherein the network information message is responsive to the request message and indicates a plurality of wireless local area networks (WLANs) available for handoff;

the UE determining that the UE is within a range of coverage of at least one of the plurality of WLANs based on location information for the UE and location information for the at least one of the plurality of WLAN, and, in response, the UE selecting a WLAN from the plurality of WLANs for handoff based on the network information message;

the UE performing a handoff from the cellular access network to the selected WLAN; and

the UE communicating data via the selected WLAN using a second IP address.

2. The method of claim 1, wherein the selecting the WLAN for handoff is further based on a user preference.

3. The method of claim 1, wherein the selecting the WLAN for handoff is further based on a received signal power level.

4. The method of claim 1, wherein the network information message further indicates a location of each of the WLANs.

5. The method of claim 1 wherein the request message indicates a request for information related to access networks available for handoff in a cell serving the UE.

6. The method of claim 1 wherein the request message indicates a request for information related to access networks available for handoff in an area close to the UE.

7. The method of claim 1, wherein the network information message indicates coordinates of each of the WLANs.

8. The method of claim 1, further comprising:

receiving information via the WLAN that indicates the second IP address.

9. A user equipment (UE) comprising:

a first transceiver configured to;

receive a service via a cellular access network using a first Internet Protocol (IP) address;

send a request message via the cellular access network, the request message indicating a request for location information related to access networks available for handoff; and

receive a network information message via the cellular access network, wherein the network information message is responsive to the request message and indicates a plurality of wireless local area networks (WLANs) available for handoff;

a processor configured to

determine that the UE is within a range of coverage of at least one of the plurality of WLANs based on location information for the UE and location information for the at least one of the plurality of WLAN; and

in response to determining that the UE is within the range of coverage of the at least one of the plurality of WLANs, select a WLAN of the plurality of WLANs for handoff based on the network information message; and

a second transceiver configured to;

perform a handoff from the cellular access network to the selected WLAN; and

communicate data via the selected WLAN using a second IP address.