Reverse rate control

• US 20020151310A1
• Filed: 02/07/2001
• Published: 10/17/2002
• Est. Priority Date: 02/07/2001
• Status: Active Grant

• Current Assignee: Ericsson Evdo, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Incorporated (CommScope Holding Company, Inc.)
• Inventors: Chung, Sae-Young, Kim, Dae-Young
• Granted Patent: US 6,741,862 B2
• Time in Patent Office: Days
• US Class Current: 455/452.1
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0022 in which mode-switching is influenced by the user
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 2001/0092 Error control systems characterised by the topology of the transmission link

Abstract

By controlling reverse rates among mobile stations to reduce reverse-link interference, reverse-link throughput can be increased.

Claims

1. A method comprising

at a mobile wireless communication device operating in a cell, transmitting data to the sectors, and

at the base station controlling the reverse data rate of the mobile device based on an estimated amount of interference the mobile device is causing to other sectors.

2. The method of claim 1 in which the estimated amount of interference is based on a forward-link SIR for the mobile device.

3. The method of claim 2 in which the forward-link SIR is averaged over a period of time.

5. The method of claim 1 in which the estimated amount of interference is based on total power received from the mobile device at the base station.

6. The method of claim 1 in which the estimated amount of interference is based on the mobile device'"'"'s request forward-link data rate.

7. The method of claim 6 in which the request data rate is averaged over a certain period of time

8. The method of claim 1 in which the reverse rate of the mobile device is set by the base station.

9. The method of claim 8 in which the reverse rate is set as a target rate based on the queue status of the mobile device.

10. The method of claim 8 in which the reverse rate is set as a target rate based on the status of the sector in which the mobile device is operating.

11. The method of claim 10 in which the status of the sector comprises a number of mobile devices.

12. The method of claim 10 in which the status of the sector comprises a reverse rate of other devices operating in the sector.

13. The method of claim 1 in which the reverse rate of the mobile device is set by the mobile device.

14. The method of claim 13 in which the reverse rate is set based on a determined rate limit.

15. The method of claim 14 in which the rate limit is communicated to the mobile device from the base station.

16. The method of claim 14 in which the reverse rate is limited by sending rate control bits from the base station to the mobile device.

17. The method of claim 13 in which the mobile device sets a value of MaxRate according to a message from the base station, the MaxRate being dependent on the current rate of the mobile device and given transition probabilities.

18. The method of claim 13 in which the mobile device sets a MaxRate deterministically.

19. The method of claim 1 in which the aggregate rate from all mobile devices in all sectors is maximized.

20. The method of claim 19 in which the rate of each mobile device is restricted by a condition.

21. The method of claim 20 in which the condition includes fairness among the mobile devices.

22. The method of claim 1 in which the aggregate rate from all mobile devices in the sector is maximized

23. The method of claim 22 in which the rate of each mobile device is restricted by a condition.

24. The method of claim 23 in which the condition includes fairness among the mobile devices.

27. The method of claim 26 in which the estimated amount of interference is based on its forward-link SIR.

28. The method of claim 26 in which the estimated amount of interference is based on its forward-link rate.

29. The method of claim 26 in which the estimated amount of interference is based on its request forward-link data rate.

30. The method of claim 26 in which the estimated amount of interference is based on the received power from the base station.

31. The method of claim 26 in which the reverse rate is limited by a command from the base station.

4. The method of claim I in which the estimated amount of interference is based on pilot power from the mobile device received at the base station.

25. A method comprising

generating one or more reverse rate control bit or bits for each of several mobile devices operating in a sector of a cell, and

controlling the reverse rates of the respective mobile devices based on the reveres rate control bits.

26. A method comprising

at a mobile wireless communication device operating in a sector of a cell, transmitting data to the base station in the sector, and controlling its reverse data rate based on an estimated amount of interference the mobile device is causing to base stations in other sectors.