METHOD FOR ENHANCING DATA TRANSMISSION EFFICIENCY

• US 20100281189A1
• Filed: 10/16/2009
• Published: 11/04/2010
• Est. Priority Date: 04/30/2009
• Status: Active Grant

• Current Assignee: Ralink Technology Corporation (MediaTek, Inc.)
• Original Assignee: Ralink Technology Corporation (MediaTek, Inc.)
• Inventors: Yu, Chen-Hai, Yu, Ching-Hwa
• Granted Patent: US 8,683,094 B2
• Time in Patent Office: Days
• US Class Current: 710/29
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices

Abstract

A method for enhancing data transmission efficiency in a data transmission system having a host, a subsystem and a transmission interface, utilized for the host to transmit and receive a data from a memory of the subsystem via the transmission interface includes steps of the host outputting a query command to the subsystem via the transmission interface for querying available memory utilization of the subsystem; the subsystem outputting a return message to the host via the transmission interface for indicating the available memory utilization according to the query command; and controlling data transmission from the host to the subsystem according to the return message.

Claims

1. A method for a data transmission system having a host, a subsystem and a transmission interface, utilized for the host to transmit and receive a data from a memory of the subsystem via the transmission interface, the method comprises:

the host outputting a query command to the subsystem via the transmission interface for querying available memory utilization of the subsystem;

the subsystem outputting a return message to the host via the transmission interface for indicating the available memory utilization according to the query command; and

controlling data transmission from the host to the subsystem according to the return message.

2. The method of claim 1, wherein the return message is carried in a packet.

3. The method of claim 1, wherein a step of controlling data transmission from the host to the subsystem according to the return message is stopping data transmission from the host to memory of the subsystem via the transmission interface when the return message indicates that the available memory utilization is below a default value.

4. The method of claim 1, wherein the step of controlling data transmission from the host to the subsystem according to the return message is controlling data transmission from the host to memory of the subsystem via the transmission interface when the return message indicates that the available memory utilization is above a default value.

5. The method of claim 1, wherein the step of controlling data transmission from the host to the subsystem according to the return message is adjusting a size of a data packet transmitted from the host to the subsystem according to the available memory utilization indicated by the return message.

6. The method of claim 1, wherein a data processing rate of the subsystem is higher than a data transmission rate of the transmission interface.

7. A method for a data transmission system having a host, a subsystem and a transmission interface, the method comprises:

the host transmitting data to a memory of the subsystem via the transmission interface;

the subsystem generating an indication message transmitting to the host via the transmission interface according to memory utilization; and

controlling data transmission from the host to the subsystem according to the indication message.

8. The method of claim 7, wherein a step of the subsystem generating the indication message transmitting to the host via the transmission interface according to the memory utilization comprises:

setting a high storage threshold and a low storage threshold for the memory; and

comparing a storage value of the memory with the high storage threshold and the low storage threshold for generating the indication message transmitting to the host via the transmission interface.

9. The method of claim 8, wherein a step of controlling data transmission from the host to the subsystem according to the indication message is stopping the host to transmit data to the memory of the subsystem via the transmission interface when the indication message indicates that the storage value is above the high storage threshold.

10. The method of claim 9 further comprising resuming the host to transmit data to the memory of the subsystem via the transmission interface when the indication message indicates that the storage value decreases from above the high storage threshold to below the low storage threshold.

11. The method of claim 7, wherein the step of the subsystem generating the indication message transmitting to the host via the transmission interface according to the memory utilization comprises:

generating a sliding window;

adjusting a length of the sliding window for recording the storage value of the memory according to each transceiving data; and

the subsystem generating the indication message transmitting to the host via the transmission interface according to the length of the sliding window.

12. The method of claim 11, wherein a step of adjusting the length of the sliding window for recording the storage value of the memory according to each transceiving data of the memory is increasing the length of the sliding window when the memory receives a data and decreasing the length of the sliding window when the memory outputs a data, for recording the storage value of the memory.

13. The method of claim 12, wherein the step of controlling data transmission from the host to the subsystem according to the indication message is stopping the host to transmit data to the memory of the subsystem of the subsystem via the transmission interface when the indication message indicates that the length of the sliding window is above a default value.

14. The method of claim 13 further comprising resuming the host to transmit data to the memory of the subsystem via the transmission interface when the indication message indicates that the length of the sliding window decreases from above the default value to below the default value.

15. The method of claim 11, wherein the step of adjusting the length of the sliding window for recording the storage value of the memory according to each transceiving data of the memory is decreasing the length of the sliding window when the memory receives a data and increasing the length of the sliding window when the memory outputs a data, for recording the storage value of the memory.

16. The method of claim 15, wherein the step of controlling data transmission from the host to the subsystem according to the indication message is stopping the host to transmit data to the memory of the subsystem via the transmission interface when the indication message indicates that the length of the sliding window is below a default value.

17. The method of claim 16 further comprising resuming the host to transmit data to the memory of the subsystem via the transmission interface when the indication message indicates that the length of the sliding window increases from below the default value to above the default value.

18. The method of claim 7, wherein the step of controlling data transmission from the host to the subsystem according to the indication message is adjusting a size of a data packet transmitted from the host to the subsystem according to the memory utilization indicated by the indication message.

19. The method of claim 7, wherein the indication message is carried in a packet.

20. The method of claim 7, wherein a data processing rate of the subsystem is higher than a data transmission rate of the transmission interface.