Boosting a signal-to-interference ratio of a mobile station

• US 7,242,958 B2
• Filed: 09/08/2005
• Issued: 07/10/2007
• Est. Priority Date: 10/12/2001
• Status: Expired due to Term

• Current Assignee: Ericsson Evdo, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Incorporated (CommScope Holding Company, Inc.)
• Inventors: Chung, Sae-Young, Eyuboglu, M. Vedat, Kim, Dae-Young, Harikumar, Gopal
• Primary Examiner(s): Eng; George
• Assistant Examiner(s): Bhattacharya; Sam
• Application Number:
  US11/222,475
• Publication Number:
  US 20060003794A1
• Time in Patent Office: 670 Days
• Field of Search: 455/422.1, 455/445, 455/447, 455/501, 455/522, 455/555, 455/561, 455/562.1, 370/336, 370/341, 370/345, 370/442, 370/202, 370/313, 370/314, 370/328, 370/329, 370/335, 370/337
• US Class Current: 455/522
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile

Abstract

Techniques for transmitting encoded data packets to one or more mobile stations in a communication system including a cell that has sectors serving at least partially different geographic areas. The techniques include transmitting in a first sector an encoded data packet in one or more time slots to a mobile station; reducing transmission power in a second sector during one or more of the time slots in which the first sector transmits the data packet to the mobile station; decoding at the mobile station the encoded data packet after each time slot; transmitting by the mobile station a signal indicating acknowledgment of the packet reception when the decoding of the packet is successful; and in response to receiving the acknowledgement signal, ceasing transmission of the data packet in the first sector in subsequent time slots.

Claims

1. A method comprising:

at a mobile station, attempting to decode an encoded data packet after each of one or more time slots in which the encoded data packet has been transmitted to the mobile station in a first sector of a cell of a communication system;

during one or more of the time slots in which the data packet has been transmitted to the mobile station in the first sector, reducing transmission power in a second sector of the cell from a first power level to a second power level;

when the decoding of the data packet is successful, transmitting by the mobile station of an acknowledgment; and

in response to the acknowledgement, ceasing transmission of the data packet in the first sector and restoring transmission power in the second sector of the cell to the first power level in subsequent time slots.

2. The method of claim 1 wherein the transmission of the data packet in the first sector and the level of the transmission power in the second sector is controlled according to a pattern.

3. The method of claim 2 wherein the pattern is organized in a sequence of time slots and the pattern defines which sectors transmit data packets and which sectors reduce transmission power in each of the time slots.

4. The method of claim 2 wherein the pattern is a predetermined pattern repeated over time.

5. The method of claim 2 further comprising:

determining a current state of transmissions in each of the sectors; and

determining the pattern based on the determined current state of transmissions.

6. The method of claim 5 wherein the state of transmissions includes information about a scheduling status of transmissions in neighboring sectors.

7. The method of claim 6 wherein the state of transmissions includes information about current transmission rates of a sector.

8. The method of claim 5 wherein the state of transmissions includes information about a next time slot scheduled for transmission in a sector.

9. The method of claim 5 wherein the state of transmissions includes information about a forward link signal-to-interference ratio measured at a mobile station located within a sector.

10. The method of claim 5 wherein the state of transmissions includes information about an estimated location of a user scheduled to receive a data packet in a sector.

11. The method of claim 5 wherein the state of transmissions includes a fairness parameter for a user scheduled to receive a data packet in a sector.

12. The method of claim 5 wherein the state of transmissions includes information about an application type of a user scheduled to receive data packets in a sector.

13. The method of claim 5 wherein the state of transmissions includes information about a quality of service level of a user scheduled to receive data packets in a sector.

14. The method of claim 1 further comprising:

arranging a frequency reuse factor of one or higher in the communication system.

15. The method of claim 1 wherein the second sector does not transmit any data packets while its transmission power is reduced.

16. The method of claim 1 wherein the second sector transmits data packets at a reduced transmission rate while its transmission power is reduced.

17. The method of claim 1 wherein reducing transmission in a second sector comprises suppressing transmission in the second sector.