Systems and methods for facilitating efficient vertical handoffs in a wireless communication system

• US 8,489,093 B2
• Filed: 04/07/2011
• Issued: 07/16/2013
• Est. Priority Date: 04/07/2011
• Status: Active Grant

• Current Assignee: Novatel Wireless, Inc. (Inseego Corp.)
• Original Assignee: Novatel Wireless, Inc. (Inseego Corp.)
• Inventors: Souissi, Slim, Wu, John, Kim, Brad
• Primary Examiner(s): Ly, Nghi H
• Application Number:
  US13/082,279
• Publication Number:
  US 20120258715A1
• Time in Patent Office: 831 Days
• Field of Search: 455/434, 455/419, 455/441, 455/436, 455/442, 455/422.1, 455/435.1, 455/432.1, 370/331
• US Class Current: 455/434
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 36/322 by location data
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems and methods are provided for performing efficient vertical handoffs in a wireless user device are provided. The user device can comprise a mobile phone, computer table, handheld computer, or other computer system capable of connecting to more than one mobile wireless network that use different wireless communication protocols. Various efficient scanning methods are disclosed that are efficient in terms of battery usage, thermal performance, processing power, throughput performance, or a combination thereof.

Claims

1. A method for managing network connectivity of a wireless device, the wireless device being connected to a first wireless network and configured to scan for a signal of a second wireless network, the first wireless network and the second wireless network being configured to operate using different wireless communication protocols, the method comprising:

scanning for a signal of the second wireless network while the wireless device is connected to the first wireless network,

collecting location information about the location of the wireless device;

comparing the location information to coverage map information that indicates where coverage for a second wireless network is available;

determining whether the wireless device is located in a coverage area of the second wireless network;

scanning for a signal of a second wireless network if the wireless device is located in a coverage area of the second wireless network;

executing a vertical handoff from the second wireless network to the first wireless network if the signal of the first wireless network is detected;

operating the wireless device on the first wireless network for a predetermined period of time before again scanning for the signal of the second wireless network.

2. The method of claim 1 wherein collecting information about the location of the wireless device includes receiving data from a motion sensor associated with the wireless device.

3. The method of claim 1 wherein collecting information about the location of the wireless device includes receiving location information from a GPS unit associated with the wireless device.

4. The method of claim 1 wherein collecting information about the location of the wireless device includes determining a serving cell identifier associated with a base station providing wireless service to the wireless device.

5. The method of claim 4 wherein estimating mobility of the wireless device based on the location information further comprises:

comparing a previous serving cell identifier to a current serving cell identifier to determine whether the wireless device is moving.

6. A wireless device configured to connect a first wireless network and a second wireless network, the first wireless network and the second wireless network being configured to operate using different wireless communication protocols, the wireless device comprising:

a mobile network interface comprising a transmitter configured to transmit data to a wireless access point of a wireless wide area network (WWAN) and a receiver configured to receive data from the wireless access point;

a non-transitory computer readable medium configured to store executable programmed modules;

a processor communicatively coupled with the non-transitory computer readable medium configured to execute programmed modules stored therein;

a mobile network interface module stored in the non-transitory computer readable medium and configured to manage data communications between the wireless router and the wireless access point user devices using the mobile network interface; and

a connection module stored in the non-transitory computer readable medium and the connection being configured to perform the steps of

scanning for a signal of the second wireless network while the wireless device is connected to the first wireless network,

collecting location information about the location of the wireless device;

comparing the location information to coverage map information that indicates where coverage for a second wireless network is available,

determining whether the wireless device is located in a coverage area of the second wireless network,

scanning for a signal of a second wireless network if the wireless device is located in a coverage area of the second wireless network,

executing a vertical handoff from the second wireless network to the first wireless network if the signal of the first wireless network is detected, and

operating the wireless device on the first wireless network for a predetermined period of time before again scanning for the signal of the second wireless network.

7. The wireless device of claim 6 wherein collecting information about the location of the wireless device includes receiving data from a motion sensor associated with the wireless device.

8. The wireless device of claim 6 wherein collecting information about the location of the wireless device includes receiving location information from a GPS unit associated with the wireless device.

9. The wireless device of claim 6 wherein collecting information about the location of the wireless device includes determining a serving cell identifier associated with a base station providing wireless service to the wireless device.

10. A wireless device configured to connect a first wireless network and a second wireless network, the first wireless network and the second wireless network being configured to operate using different wireless communication protocols, the wireless device comprising:

a mobile network interface comprising a transmitter configured to transmit data to a wireless access point of a wireless wide area network (WWAN) and a receiver configured to receive data from the wireless access point;

a non-transitory computer readable medium configured to store executable programmed modules;

a processor communicatively coupled with the non-transitory computer readable medium configured to execute programmed modules stored therein;

a mobile network interface module stored in the non-transitory computer readable medium and configured to manage data communications between the wireless router and the wireless access point user devices using the mobile network interface; and

a connection module stored in the non-transitory computer readable medium and the connection being configured to perform the steps of

scanning for a signal of a first wireless network while the wireless device is connected to a second wireless network, the first wireless network and the second wireless network being configured to operate using different wireless communication protocols;

executing a vertical handoff from the second wireless network to the first wireless network if the signal of the first wireless network is detected;

operating the wireless device in a scanning mode if the signal of the first wireless network is not detected, wherein operating the wireless device in the scanning mode further comprises

scanning for a signal of the second wireless network while a user device is connected to the first wireless network,

collecting location information about the location of the wireless device;

comparing the location information to coverage map information that indicates where coverage for a second wireless network is available;

determining whether the wireless device is located in a coverage area of the second wireless network;

scanning for a signal of a second wireless network if the wireless device is located in a coverage area of the second wireless network;

executing a vertical handoff from the second wireless network to the first wireless network if the signal of the first wireless network is detected;

operating the wireless device on the first wireless network for a predetermined period of time before again scanning for the signal of the second wireless network.

11. The wireless device of claim 10 wherein collecting information about the location of the wireless device includes receiving data from a motion sensor associated with the wireless device.

12. The wireless device of claim 10 wherein collecting information about the location of the wireless device includes receiving location information from a GPS unit associated with the wireless device.

13. The wireless device of claim 10 wherein collecting information about the location of the wireless device includes determining a serving cell identifier associated with a base station providing wireless service to the wireless device.