Method for assigning subscribers between narrowbeam sectors

• US 5,649,293 A
• Filed: 05/25/1995
• Issued: 07/15/1997
• Est. Priority Date: 05/25/1995
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Reed, John Douglas
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US08/450,057
• Time in Patent Office: 782 Days
• Field of Search: 455/33.3, 455/33.1, 455/33.2, 455/33.4, 455/54.1, 455/54.2, 455/56.1, 455/62, 455/63, 379/59, 379/60
• US Class Current: 455/453
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 16/24 Cell structures

Abstract

A method for assigning subscribers between narrowbeam sectors includes, in a first embodiment, off-loading subscribers to alternate sectors when a current sector becomes loaded beyond a loading threshold. The subscriber(s) having the greatest signal quality measure (e.g., power setting) are preferably selected for off-loading, since such are typically in regions having the greatest overlap with other sectors (e.g., close to the antennas). The selected subscriber(s) are transferred to an alternate sector, preferably one having the best received signal quality with the subscriber and also having loading beneath the loading threshold.

Claims

1. A method for load-sharing between a plurality of sectors of a base station, comprising:

(a) monitoring a loading level for each sector of the plurality of sectors of the base station;

(b) in response to a first sector'"'"'s loading level exceeding a predetermined threshold, selecting a first subscriber, communicating via the first sector, that is located closer to the base station than a second subscriber communicating via the first sector; and

(c) off-loading the first subscriber to a further sector of the base station for communications with the first subscriber.

2. The method of claim 1, wherein the loading level is a number of available channels for use in said each sector, and the step of monitoring comprises updating said number of available channels for use in said each sector based on changes in a subscriber call activity.

3. The method of claim 1, wherein the loading level is a number of channels being used in said each sector, and the step of monitoring comprises updating said number of channels being used in said each sector based on changes in a channel use parameter.

4. The method of claim 1, wherein the loading level is a number based on a channel utilization in said each sector, and the step of monitoring comprises periodically updating said number based on changes in said channel utilization.

5. The method of claim 1, wherein each subscriber has a transmit power level, and wherein the step of selecting a first subscriber includes selecting a subscriber having a lowest transmit power level.

6. The method of claim 1, wherein each subscriber has a transmit power level, and wherein the step of selecting a first subscriber includes selecting a first subscriber based upon time of flight of radio signal propagation.

7. The method of claim 1, wherein step (c) comprises the steps of:

measuring a receive signal quality of a signal from the first subscriber by other sectors of the plurality of sectors of the base station;

selecting a further sector having the greatest receive signal quality from the first subscriber; and

establishing communications for the first subscriber via the selected further sector.

8. The method of claim 7, wherein the step of measuring includes measuring by all further sector antennas of an antenna panel with a first sector antenna serving the first sector.

9. The method of claim 7, wherein the step of measuring includes measuring by a group of predetermined neighboring sector antennas wherein the group comprises at least all further sector antennas serving adjacent sectors to the first sector.

10. The method of claim 7, wherein the step of measuring includes measuring said receive signal quality of a signal from the first subscriber by the other sector antennas wherein the receive signal quality is a measure of receive signal strength.

11. The method of claim 7, wherein step (c) further comprises only establishing communications via the further sector when the further sector has a further loading level that is less than a further predetermined threshold.

12. The method of claim 11, wherein when the further loading level exceeds the further predetermined threshold, step (c) further comprises establishing communications via a still further sector having a next greatest receive signal quality.

13. A method for reassigning subscriber communication channels for subscribers communicating via a base station having a plurality of sectors, comprising:

(a) measuring a level of communications channel utilization for each sector;

(b) in response to the level of a first sector of the narrowbeam sectors exceeding a predetermined threshold, selecting a first subscriber communication channel, communicating via the first sector, that is used by a subscriber located closer to the base station than a second subscriber communicating via the first sector; and

(c) reassigning the first subscriber communication channel to a further sector of the plurality of sectors for communications with the first subscriber.

14. The method of claim 13, wherein step (a) further comprises measuring the level of communications channel utilization for each sector wherein the level is a number of available channels for use in said each sector.

15. The method of claim 13, wherein the step of measuring comprises periodically updating the level based on changes in communications channel utilization for each sector.

16. The method of claim 13, wherein each subscriber has a transmit power level, and wherein the step of selecting a first subscriber includes selecting a subscriber based upon having a low transmit power level for a period of time.

17. The method of claim 13, wherein step (c) comprises:

measuring receive signal quality of the first subscriber communication channel by other sectors of the plurality of sectors of the base station to determine a further sector measuring the greatest receive signal quality; and

transferring the first subscriber communication channel for communications via the further sector.

18. The method of claim 17, wherein the step of transferring comprises switching the first subscriber communication channel from a first antenna serving the first sector to a further antenna serving the further sector.

19. The method of claim 17, wherein the step of transferring comprises switching the first subscriber communication channel from a first frequency via a first antenna serving the first sector to a second frequency via a further antenna serving the further sector.