Method for reducing the rate of registration in CDMA-based mobile networks

• US 20080153483A1
• Filed: 12/20/2006
• Published: 06/26/2008
• Est. Priority Date: 12/20/2006
• Status: Active Grant

• Current Assignee: King Fahd University Of Petroleum And Minerals
• Original Assignee: King Fahd University Of Petroleum And Minerals
• Inventors: Abu-Amara, Marwan Hassan
• Granted Patent: US 7,769,380 B2
• Time in Patent Office: Days
• US Class Current: 455/432.1
• CPC Class Codes: H04W 8/06 Registration at serving network Location Register, VLR or user mobility server

Abstract

The method for reducing the rate of registration in CDMA-based mobile networks is a method for preventing a traveling mobile device from registering within a new, or secondary, registration area, prior to physically relocating from a first, or current, registration area to the new registration area. The mobile device has a storage memory associated therewith, for storing a database containing geographic coordinates defining boundaries of a plurality of registration areas. The mobile device scans for a new registration pilot signal associated with a new registration area, and upon detection, the geographic location of the mobile device is determined. This geographic location is compared with the coordinates of the boundaries stored within the database, and if the mobile device is determined to be within the boundary defining the new registration area, the mobile device is then registered with a base station of the new registration area.

Claims

1. A method for reducing the rate of registration in CDMA-based mobile networks, comprising the steps of:

providing a mobile device;

defining a first registration area and a plurality of secondary registration areas;

defining a signal strength difference threshold;

providing a database associated with the mobile device, the database including geographic coordinates defining respective boundaries of the first and secondary registration areas;

initially positioning the mobile device in the first registration area, the mobile device being in communication with a first base station associated with the first registration area;

providing first and a plurality of secondary registration pilot signals respectively associated with the first and secondary registration areas;

scanning for a new registration pilot signal associated with one of the plurality of secondary registration areas;

receiving the new registration pilot signal and making a first measurement of the strength of the new registration pilot signal;

determining the geographic location of the mobile device;

comparing the geographic location of the mobile device with the geographic coordinates included in the database; and

determining whether the mobile device is within the boundary of the first registration area or within the boundary of one of the secondary registration areas, whereby if the mobile device is within the boundary of one of the secondary registration areas, the mobile device registers with a respective secondary base station associated with the particular one of the secondary registration areas, the mobile device returning to said step of scanning for a new registration pilot signal;

whereby if the mobile device is within the boundary of the first registration area, the mobile device makes a second measurement of the strength of the new registration pilot signal, and if the difference between the second measurement and the first measurement is less than the signal strength difference threshold, then the mobile device returns to said step of scanning for a new registration pilot signal,

further, if the difference between the second measurement and the first measurement is greater than the signal strength difference threshold, then the mobile device returns to said step of determining the geographic location of the mobile device.

2. The method for reducing the rate of registration in CDMA-based mobile networks according to claim 1, wherein said step of determining the geographic location of the mobile device includes determination of whether the mobile device is in communication with the global positioning system, whereby if the mobile device is in communication with the global positioning system, the geographic location of the mobile device is defined by a set of global positioning coordinates received by the mobile device from the global positioning system, whereby if the mobile device is not in communication with the global positioning system, the geographic location of the mobile device is determined by measuring the strength of the first registration pilot signal and comparing the strength of the first registration pilot signal with the strength of the new registration pilot signal, whereby if the strength of the first registration pilot signal is greater than the strength of the second registration pilot signal, the geographic location of the mobile device is set within the boundary of the first registration area, and if the strength of the new registration pilot signal is greater than the strength of the first registration pilot signal, the geographic location of the mobile device is set to a geographic location within the particular one of the secondary registration areas.

3. The method for reducing the rate of registration in CDMA-based mobile networks according to claim 2, wherein if the mobile device is not in communication with the global positioning system, and if the strength of the new registration pilot signal is greater than the strength of the first registration pilot signal, the geographic location of the mobile device is estimated based upon intensity and directional properties of the new registration pilot signal generated by the particular secondary base station associated with the particular one of the secondary registration areas.