Access point detection

Patent metadata

Field	Value
Publication number	US-10111159-B2
Application number	US-201314389628-A
Country	US
Kind code	B2
Filing date	Mar 27, 2013
Priority date	Mar 30, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

A wireless communications device has network interfaces for accessing cellular data networks and Wi-Fi wireless local area networks. Wi-Fi offload allows data traffic to be moved away from the cellular network to the Wi-Fi network. To avoid any existing data sessions being broken during offload, Proxy Mobile IP (PMIP) must be supported by a Wi-Fi access point and associated Mobile Access Gateway. Before Wi-Fi association and authentication, the wireless communication device scans the surrounding area for access points and determines which of the access points supports PMIP before selecting one for association.

First claim

The invention claimed is:

1. A method of determining whether wireless local area network (WLAN) access points of a WLAN hotspot network are capable of providing a network mobility service to data sessions of a wireless communication device, each WLAN access point configured with the same Subscriber Service Identity (SSID) network name and at least a first set of WLAN access points being capable of supporting the network mobility service and at least a second set of WLAN access points being unable to support the network mobility service, and the wireless communication device having a cellular network interface and a wireless local area network network interface, and being connected to the cellular network, the method comprising:
detecting, using the wireless local area, network interface, any WLAN access points of the WLAN hotspot network which are within a wireless local area network connectivity range of said wireless communication device;
sending to a network device directory server, via the cellular network, a request for access point handover candidates, the request including a list of the detected WLAN access points and user identity information;
receiving a response from the network device directory server via the cellular network interface, containing the list of detected WLAN access points and for each detected WLAN access point, an indication of whether that WLAN access point can provide the network mobility service determined on the basis of that WLAN access point being in the first set of WLAN access points of the hotspot network, and a determination that a user of the wireless communication device, as identified by the user identity information, is permitted to access the network mobility service;
processing the received response in order to select a handover WLAN access point; and
connecting to the selected WLAN access point of the WLAN hotspot network,
wherein said sending the request, said receiving the response, and said processing the received response is performed prior to said connecting to the selected WLAN access point.

2. The method according to claim 1 , wherein:
the request includes the location of the wireless communications device; and
the response includes for the identity of at least one of the WLAN access points which was not detected by the wireless communication device but is in the same location as the wireless communications device.

3. The method according to claim 1 , wherein the network device directory server is an Access Network Discovery & Selection Function server located in the cellular network.

4. An apparatus wireless communications with a cellular network and a wireless local area network (WLAN) hotspot network, the WLAN hotspot network being formed of a plurality of WLAN access points, each configured with the same Subscriber Service Identifier (SSID) and at least a first set of WLAN access points being capable of supporting a network mobility service and at least a second set of WLAN access points being unable to support the network mobility service, the apparatus comprising:
a cellular network interface;
a WLAN interface;
a processing system, including a processor and memory storing instructions for execution by the processor, the processing system being configured to:
detect, using the WLAN interface, any WLAN access points of the WLAN hotspot network which are within a wireless connectivity range;
send, via the cellular network, to a network device directory server, a list of the detected access points and user identity information;
receive a response from the network device directory server via the cellular network interface, containing the list of detected WLAN access points and for each detected WLAN access point, an indication of whether that WLAN access point can provide the network mobility service determined on the basis of that WLAN access point being in the first set of WLAN access points of the hotspot network, and a determination that a user of the wireless communication device, as identified by the user identity information, is permitted to access the network mobility service;
process the response in order to select a handover wireless access point; and
connect to the selected WLAN access point of the WLAN hotspot network,

wherein the processing system is configured to send the request, receive the response, and process the received response prior to connecting to the selected WLAN access point.

5. The apparatus according to claim 4 , wherein:
the request includes the location of the wireless communications device; and
the response includes the identity of at least one of the access points which was not detected by the wireless communication device but is in the same location as the wireless communications device.

6. The apparatus according to claim 4 , wherein the network device directory server is an Access Network Discovery & Selection Function server located in the cellular network.

7. A method of determining whether wireless local area network (WLAN) access points to a WLAN hotspot network are capable of providing a network mobility service to data sessions of a wireless communication device, each WLAN access point configured with the same Subscriber Service Identity (SSID) network name and at least a first set of WLAN access points being capable of supporting the network mobility service and at least a second set of WLAN access points being unable to support the network mobility service, and the wireless communication device having a cellular network interface and a WLAN interface and being connected to the cellular network, the method comprising:
the wireless communication device:
detecting, using the WLAN interface, any WLAN access points of the hotspot network which are within a wireless connectivity range;
sending, via the cellular network, a request to a network device directory server, the request including a list of the detected WLAN access points and user identity information,

the network device directory server:
receiving said request from said wireless communication device;
determining for each WLAN access point in the received list, whether that WLAN access point is in the first set of WLAN access points of the WLAN hotspot network, and whether a user of the wireless communication device, as identified by the user identity information, is permitted to access the network mobility service; and
sending a response message containing the list of detected WLAN access points and for each detected WLAN access point, an indication of whether that WLAN access point can provide the network mobility service to the user,

the wireless communication device:
receiving the response message from the network device directory server via the cellular network interface; and
processing the received device information to select a WLAN access point for handover prior to connecting to one of the detected WLAN access points.

8. A non-transitory computer-readable medium storing executable instructions for causing a computer system to perform a method of determining whether wireless local area network (WLAN) access points of a WLAN hotspot network are capable of providing a network mobility service to data sessions of a wireless communication device, each WLAN access point configured with the same Subscriber Service Identifier (SSID) network name and at least a first set of WLAN access points being capable of supporting the network mobility service and at least a second set of WLAN access points being unable to support the network mobility service, and the wireless communication device having a cellular network interface and a WLAN network interface and being connected to the cellular network, the method comprising:
detecting, using the WLAN network interface, any WLAN access poi

Assignees

• British Telecomm

Inventors

• Scahill Francis James
• Evenden Richard Joseph
• Orlandi Barbara

Classifications

• H04W12/06

  Authentication · CPC title

• H04W88/06

  adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals · CPC title

• H04L63/0892

  by using authentication-authorization-accounting [AAA] servers or protocols · CPC title

• H04W48/16 Primary

  Discovering, processing access restriction or access information · CPC title

• H04W48/00

  Access restriction (access security to prevent unauthorised access H04W12/08); Network selection; Access point selection · CPC title