Mobile station, system and method for use in wireless communications

• US 8,396,483 B2
• Filed: 12/27/2006
• Issued: 03/12/2013
• Est. Priority Date: 12/29/2005
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola Solutions, Inc.
• Inventors: Chater-Lea, David J., Lucas, Richard C.
• Primary Examiner(s): Afshar, Kamran
• Assistant Examiner(s): SHAHEED, KHALID W
• Application Number:
  US12/158,728
• Publication Number:
  US 20090253438A1
• Time in Patent Office: 2,267 Days
• Field of Search: 455/456.1, 455/562.1, 455/12.1, 455/575.1, 455/575.5, 455/63.4, 455/25, 455/19, 455/13.3, 342/368, 342/354, 342/147, 342/154
• US Class Current: 455/456.1
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04M 2250/10 including a GPS signal receiver
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

A mobile station (101) for use in a wireless communication system includes a steerable antenna, means for obtaining location information relating to a current location of the mobile station and a steering controller for controlling a pointing direction of the steerable antenna using the location information and characterized in that the mobile station includes a memory holding a database of optimal pointing directions of the steerable antenna for given locations and the steering controller is operable to steer the antenna to the optimal pointing direction indicated in the database for the current location. Also described is a system and a method in which the mobile station operates.

Claims

1. A mobile station for use in a wireless communication system comprising:

a steerable antenna;

means for obtaining location information relating to a current location of the mobile station;

a memory comprising a local database of optimal antenna pointing directions for given locations;

a steering controller configured to control a pointing direction of the steerable antenna using the location information and the optimal pointing direction indicated in the local database for the current location of the mobile station;

a receiver configured to receive, by wireless communication, one or more received updates to the local database, each received update indicating a difference, for each particular given location in the received update, between a first antenna pointing direction stored in the local database and a received improved antenna pointing direction that is associated with an improved signal strength or quality;

a detector configured to detect an improved optimal antenna pointing direction detected to give an improved signal strength or quality compared to a corresponding optimal pointing directions indicated in the local database for the current location of the mobile station; and

a transmitter configured to send, by wireless communication, a signal providing the detected improved optimal antenna pointing direction to a remote terminal of the system for storage in a remote database of the system, wherein the transmitted signal provides information indicating a difference, for the current location in the detected improvements, between a particular optimal antenna pointing direction stored in the local database and the detected improved optimal antenna pointing direction.

2. The mobile station according to claim 1, wherein the optimal pointing direction for the current location of the mobile station provides a link to a base station of the system currently serving the mobile station.

3. The mobile station according to claim 1, wherein the optimal pointing direction for the current location of the mobile station provides receipt of a signal from a base station other than a base station of the system currently serving the mobile station.

4. The mobile station according to claim 1, further comprising a global positioning system (GPS) receiver operable to derive the location information.

5. The mobile station according to claim 1, further comprising a processor operable to compute the current location of the mobile station using signals from one or more terminals of the system.

6. The mobile station according to claim 1, wherein the receiver is further configured to receive, by wireless communication, from the mobile station'"'"'s current serving base station or from another terminal of the system, a preferred base station signal giving, for a particular location of the mobile station, a preferred base station to provide service to the mobile station at that location.

7. The mobile station according claim 1,

wherein the receiver is further configured to receive, from its current serving base station or from another terminal of the system, an expected signal strength signal giving, for a particular location of the mobile station, an expected signal strength or quality from the current serving base station or another terminal of the system;

the mobile station further comprising;

means for measuring a received signal strength or quality; and

a comparator for comparing the received signal strength or quality with the expected signal strength or quality.

8. The mobile station according to claim 7, wherein the steering controller is further operable to adjust the pointing direction of the steerable antenna when a difference between an expected signal strength or quality and a received signal strength or quality is found.

9. The mobile station according to claim 1, further comprising a plurality of independently steerable antennas.

10. The mobile station according to claim 9, further comprising a plurality of radio frequency transceivers, each operably coupled to one of the steerable antennas.

11. A wireless communication system comprising:

a base station; and

one or more mobile stations each comprising a steerable antenna,

wherein the base station is operably connected to a memory comprising a local database of information relating to optimal pointing directions to be used by each of the mobile stations to point the steerable antenna of the mobile station toward a target terminal, and wherein the base station is operable to;

(i) send to the one or more mobile stations signals comprising transmitted updates to the information stored in the memory for use by the mobile stations in updating locally maintained copies of the information at the mobile stations, each received update indicating a difference, for each particular given location in the transmitted update, between a first antenna pointing direction in the information stored in the memory and a transmitted improved antenna pointing direction that is associated with an improved signal strength or quality; and

(ii) receive from the one or more mobile stations a signal comprising received updates providing information indicating a difference for a given location between a first antenna pointing direction stored in the local database and an improved antenna pointing direction detected, by the one or more mobile stations, to give an improved signal strength or quality and to update corresponding data stored in the local database with the improved antenna pointing direction.

12. The system according to claim 11, wherein the memory is included within the base station.

13. The system according to claim 11, wherein the target terminal is the base station.

14. The system according to claim 11, further comprising a plurality of base stations, and wherein the information stored in the memory and sent to the one or more mobile stations relates to optimal pointing directions to be used by the one or more mobile stations when in a particular location to point the steerable antenna of the one or more mobile stations toward each of the base stations.

15. The system according to claim 11, which comprises an ad hoc network, a local area network, a safety critical communication network or a cellular radio communication network.

16. The system according to claim 15, which comprises a TETRA or an APCO or a GSM communication network.

17. A method of operation in a wireless communication system comprising a base station, and one or more mobile stations each including a steerable antenna, the method comprising, at the base station:

receiving information relating to optimal pointing directions for given locations to be used by the one or more mobile stations to point the steerable antenna of the one or more mobile stations toward a target terminal;

storing the received information in a local database;

sending, by wireless communication, the information to the one or more mobile stations;

receiving, by wireless communication from at least one of the mobile stations, a signal comprising one or more received updates providing information indicating a difference for a given location between a first antenna pointing direction previously sent to the at least one mobile station and an improved antenna pointing direction detected, by the at least one mobile station, to give an improved signal strength or quality and to update corresponding data stored in the local database with the improved antenna pointing direction; and

storing the received updates to the information in the local database.

18. The method according to claim 17, further comprising the step of broadcasting the received updates to the information to the one or more mobile stations.