Cellular telephone handset with increased reception sensitivity and reduced transmit power levels

• US 7,996,034 B1
• Filed: 01/28/2005
• Issued: 08/09/2011
• Est. Priority Date: 01/28/2005
• Status: Active Grant

• Current Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Original Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Inventors: Yegnashankaran, Visvamohan, Bahai, Ahmad
• Primary Examiner(s): THIER, MICHAEL
• Application Number:
  US11/046,024
• Time in Patent Office: 2,384 Days
• Field of Search: 445/550.1, 370/334
• US Class Current: 455/550.1
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A cellular telephone handset utilizes an electrically-steered directional antenna to increase the received signal strength when the handset is in a poor signal environment. As a result, the handset reduces the need for an end user to tilt and twirl their head to try and find the direction of the strongest signal strength.

Claims

1. A method of operating a handset, the method comprising:

determining if an incoming call message or an outgoing call message has been detected;

determining a 3D position of the handset after an incoming call message or an outgoing call message has been detected;

determining whether a direction from the 3D position of the handset to a strongest signal from a source is stored in a memory;

electrically steering an antenna pattern over a search area to collect signal strength information when a direction to the strongest signal from the source is not stored in the memory;

determining the direction to the strongest signal from the source after signal strength information from the search area has been collected; and

storing the 3D position of the handset and the direction to the strongest signal from the source in the memory after the direction to the strongest signal from the source has been determined.

2. The method of claim 1 and further comprising:

reading the direction from the 3D position of the handset to the strongest signal from the source from the memory when the direction from the 3D position of the handset to the strongest signal from the source is stored in the memory; and

electrically steering the antenna pattern to point in the direction from the 3D position of the handset to the strongest signal from the source read from the memory.

3. The method of claim 2 and further comprising reading a stored signal strength from the memory when the direction from the 3D position of the handset to the strongest signal from the source is stored in the memory.

4. The method of claim 3 and further comprising determining a received signal strength of an incoming data packet when the antenna pattern is pointed in the direction from the 3D position of the handset to the strongest signal from the source.

5. The method of claim 4 and further comprising comparing the received signal strength with the stored signal strength.

6. The method of claim 5 and further comprising determining a new direction to the strongest signal from the source when the received signal strength is less than the stored signal strength.

7. A handset comprising:

a first antenna;

a second antenna;

a beam steering circuit connected to the first antenna and the second antenna; and

a cell phone unit connected to the beam steering circuit, the cell phone unit to;

determine if an incoming call message or an outgoing call message has been detected;

determine a 3D position of the handset after an incoming call message or an outgoing call message has been detected;

determine whether a direction from the 3D position of the handset to a strongest signal from a source is stored in a memory;

command the beam steering circuit to electrically steer an antenna pattern over a search area to collect signal strength information when a direction to the strongest signal from the source is not stored in the memory;

determine the direction to the strongest signal from the source after signal strength information from the search area has been collected; and

stores the 3D position of the handset and the direction to the strongest signal from the source in the memory after the direction to the strongest signal from the source has been determined.

8. The handset of claim 7 wherein the cell phone unit:

reads the direction from the 3D position of the handset to the strongest signal from the source from the memory when the direction from the 3D position of the handset to the strongest signal from the source is stored in the memory; and

commands the beam steering circuit to electrically steer the antenna pattern to point in the direction from the 3D position of the handset to the strongest signal from the source read from the memory.

9. The handset of claim 8 wherein the cell phone unit reads a stored signal strength from the memory when the direction from the 3D position of the handset to the strongest signal from the source is stored in the memory.

10. The handset of claim 9 wherein the cell phone unit determines a received signal strength of an incoming data packet when the antenna pattern is pointed in the direction from the 3D position of the handset to the strongest signal from the source.

11. The handset of claim 10 wherein the cell phone unit compares the received signal strength with the stored signal strength.

12. The handset of claim 11 wherein the cell phone unit determines a new direction to the strongest signal from the source when the received signal strength is less than the stored signal strength.

13. A method of operating a handset, the method comprising:

determining if an incoming call message or an outgoing call message has been detected;

determining a 3D position of the handset after an incoming call message or an outgoing call message has been detected;

determining whether a direction from a location to a strongest signal from a source is stored in a memory, the location lying within a predetermined distance from the 3D position of the handset;

electrically steering an antenna pattern over a search area to collect signal strength information when the direction from the location to the strongest signal from the source is not stored in the memory;

determining a direction from the 3D position of the handset to the strongest signal from the source after signal strength information from the search area has been collected; and

storing the 3D position of the handset and the direction from the 3D position of the handset to the strongest signal from the source in the memory after the direction from the 3D position of the handset to the strongest signal from the source has been determined.

14. The method of claim 13 and further comprising:

reading the direction from the location to the strongest signal from the source from the memory when the direction from the location to the strongest signal from the source is stored in the memory; and

electrically steering the antenna pattern to point in the direction from the location to the strongest signal from the source read from the memory.