Dynamic transmission power control method

• US 8,855,701 B2
• Filed: 02/17/2012
• Issued: 10/07/2014
• Est. Priority Date: 04/11/2011
• Status: Active Grant

• Current Assignee: Airoha Technology Corporation (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Chuang, Dong-Ming
• Primary Examiner(s): PHU, SANH D
• Application Number:
  US13/398,854
• Publication Number:
  US 20120258761A1
• Time in Patent Office: 963 Days
• Field of Search: 455/522, 455/402, 455/422, 370/336, 370/431, 370/482
• US Class Current: 455/522
• CPC Class Codes: H04B 2203/5425 improving S/N by matching impedance, noise reduction, gain control
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04W 52/327 Power control of multicast channels

Abstract

The present invention discloses a dynamic transmission power control method for a transmitter of a communication system which comprises the transmitter and a plurality of receivers. The transmitter is coupled to the plurality of receivers via a plurality of corresponding outgoing links. The transmission power control method comprising collecting a plurality of suggested transmission power back-off levels for the plurality of outgoing links to the plurality of receivers and/or and a plurality of channel characteristics corresponding to the plurality of outgoing links from the plurality of receivers; and determining an allowable transmission power back-off level for a desirable receiver among the plurality of receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics.

Claims

1. A dynamic transmission power control method for a transmitter of a communication system which comprises the transmitter and a plurality of receivers, the transmitter coupled to the plurality of receivers via a plurality of corresponding outgoing links, the transmission power control method comprising:

collecting a plurality of suggested transmission power back-off levels for the plurality of outgoing links to the plurality of receivers and/or a plurality of channel characteristics corresponding to the plurality of outgoing links from the plurality of receivers; and

determining an allowable transmission power back-off level for a desirable receiver among the plurality of receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics.

2. The transmission power control method of claim 1 further comprising:

transmitting a packet to the desirable receiver with the allowable transmission power back-off level;

wherein the plurality of receivers correctly detect a header of the packet, and the desirable receiver correctly detects the header and the payload of the packet.

3. The transmission power control method of claim 2, wherein the header comprises a preamble symbol and a frame control (FC) symbol.

4. The transmission power control method of claim 2, wherein the step of determining the allowable transmission power back-off level for the desirable receiver among the receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics comprises:

calculating a plurality of maximum detectable power back-off levels for the plurality of receivers excluding the desirable receiver to correctly detect the header of the packet according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics of the plurality of receivers excluding the desirable receiver.

5. The transmission power control method of claim 4, wherein the step of determining the allowable transmission power back-off level for the desirable receiver among the receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics further comprises:

determining the allowable transmission power back-off level equal to or lower than a lower transmission power back-off level of a suggested transmission power back-off level of the desirable receiver and a minimum detectable power back-off level among the plurality of maximum detectable power back-off levels.

6. The transmission power control method of claim 2, wherein the allowable transmission power back-off level comprises an allowable header transmission power back-off level and an allowable payload transmission power back-off level.

7. The transmission power control method of claim 6 further comprising:

transmitting the header of the packet with the allowable header transmission power back-off level and the payload of the packet with the allowable payload transmission power back-off level.

8. The transmission power control method of claim 6, wherein the allowable header transmission power back-off level is equal to or lower than a minimum detectable power back-off level among a plurality of maximum detectable power back-off levels for the plurality of receivers to correctly detect the header of the packet, and the allowable payload transmission power back-off level is equal to or lower than a suggested transmission power back-off level of the desirable receiver.

9. The transmission power control method of claim 1, wherein the communication system is a powerline communication (PLC) system.