System and method for implementing local base stations

• US 7,986,678 B2
• Filed: 10/30/2007
• Issued: 07/26/2011
• Est. Priority Date: 06/27/2000
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Mousseau, Gary P., Wandel, Matthias
• Primary Examiner(s): Kizou; Hassan
• Assistant Examiner(s): Nguyen; Toan D
• Application Number:
  US11/928,388
• Publication Number:
  US 20080069064A1
• Time in Patent Office: 1,365 Days
• Field of Search: 370/312, 370/328, 370/329, 370/338, 455/421, 455/560, 455410-4141, 709/206, 380/247
• US Class Current: 370/338
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/30 Routing of multiclass traffic
• CPC Class Codes: H04L 51/214 using selective forwarding
• CPC Class Codes: H04L 51/58 Message adaptation for wireless communication
• CPC Class Codes: H04W 4/12 Messaging; Mailboxes; Announcements
• CPC Class Codes: H04W 40/20 based on geographic position or location
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 8/08 Mobility data transfer
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 92/02 Inter-networking arrangements
• CPC Class Codes: H04W 92/20 between access points

Abstract

A wireless communication system includes mobile devices and a local area network. Local base stations are coupled to the local area network. Each base station has a unique address on the network and is configured to transmit and receive data packets to and from the mobile devices and to transfer the data packets between local base stations over the network using the unique address. A subscription server operates on the network. The subscription server is configured to store data identifying the unique address of the local base station covering each of the mobile devices. The subscription server is further configured to enable the local base stations to locate any one of the mobile devices. A redirection software module is configured to send and receive data packets over a wide-area wireless network to and from mobile devices that are not within range of any of the local base stations.

Claims

1. A wireless communication system comprising:

a plurality of mobile devices;

a local area network;

a plurality of local base stations coupled to the local area network, each local base station having a unique address on the local area network and configured to transmit and receive data packets to and from the mobile devices and to transfer the data packets between local base stations over the local area network using the unique address;

a subscription server operating on the local area network and configured to store data identifying the unique address of the local base station covering each of the mobile devices; and

a redirection software module operating on the local area network and having access to a wide-area wireless network, and configured to send and receive data packets over the wide-area wireless network to and from mobile devices that are not within range of any of the local base stations;

the subscription server further configured to;

receive a request from one of the local base stations for a routing address of a mobile devices that is a destination of a data packet, the routing address being the unique address of the base station covering the mobile device;

if the subscription server does not have stored the routing address of the destination mobile device, then the subscription server calculates both the time elapsed since the destination mobile device has last been contacted and the number of failed attempts to locate destination mobile device;

if a pre-set time interval has elapsed since the destination mobile device has last been successfully contacted or if a pre-set number of failed attempts to contact the destination mobile device has been exceeded, then the subscription server delivers the data packet to the redirection software module; and

the redirection software module further configured to receive the data packet from the subscription server and to route the data packet to an electronic mailbox associated with the destination mobile device.

2. The system of claim 1 wherein the unique address is an IP address.

3. The system of claim 1 wherein the redirection software module has access to the wide-area wireless network over a wide-area computer network.

4. The system of claim 3 further comprising:

a mail server operating on the local area network and having access to the wide-area computer network, and configured to send and receive data packets to and from the wide-area computer network;

wherein the redirection software module is also configured to send and receive data packets to and from the mail server.

5. The system of claim 1 wherein the wide-area computer network is the Internet.

6. The system of claim 1 wherein the redirection software module is also configured to combine one or more data packets into an electronic message.

7. The system of claim 1 wherein the redirection software module is also configured to transfer electronic messages into an electronic mailbox.

8. The system of claim 1 wherein the subscription server is also configured to log subscription information for each of the mobile devices in the system.

9. The system of claim 8 wherein each local base station includes a subscription list that is arranged to identify the mobile devices currently covered by the particular local base station.

10. The system of claim 9 wherein each subscription list also includes subscription information for the mobile devices currently covered by the particular local base station.

11. The system of claim 1 wherein each local base station includes a route cache that stores data identifying the unique address of local base stations last known to be covering one or more of the mobile devices.

12. The system of claim 11 wherein the route cache included in each local base station is arranged to purge all data relating to any mobile device to which it has not been in communication for a set interval of time.

13. The system of claim 1 wherein one or more of the local base stations comprises a modified personal computer.

14. The system of claim 1 wherein the system is arranged to operate within an office.

15. A method for operating a wireless communication system that includes:

mobile devices;

a local area network;

local base stations coupled to the local area network and having a unique address on the local area network;

a subscription server that operates on the local area network and stores data identifying the unique address of the local base station covering each of the mobile devices; and

a redirection software module operating on the local area network and having access to a wide area wireless network,

the method comprising the steps of;

stations;

the local base stations transmitting and receiving data packets to and from the mobile devices and transferring the data packets between local base stations over the local area network using the unique address;

the redirection software module sending and receiving data packets over the wide-area wireless network to and from mobile devices that are not within range of any of the local base stations;

the subscription server receiving a request from one of the local base stations for a routing address of a mobile device that is a destination of a data packet, the routing address being the unique address of the base station covering the mobile device;

if the subscription server does not have stored the routing address of the destination mobile device, then the subscription server calculating both the time elapsed since the destination mobile device has last been contacted and the number of failed attempts to locate destination mobile device;

if a pre-set time interval has elapsed since the destination mobile device has last been successfully contacted or if a pre-set number of failed attempts to contact the destination mobile device has been exceeded, then the subscription server delivering the data packet to the redirection software module; and

the redirection receiving the data packet from the subscription server and to route the data packet to an electronic mailbox associated with the destination mobile device.