Method and apparatus for controlling startup of request to send/clear to send mechanism

• US 9,713,169 B2
• Filed: 04/03/2015
• Issued: 07/18/2017
• Est. Priority Date: 08/01/2014
• Status: Active Grant

• Current Assignee: Spreadtrum Communications USA
• Original Assignee: Spreadtrum Communications USA
• Inventors: Xie, Xin
• Primary Examiner(s): Wilson, Robert
• Application Number:
  US14/678,199
• Publication Number:
  US 20160037502A1
• Time in Patent Office: 837 Days
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Method and apparatus for controlling startup of RTS/CTS mechanism is provided. The method includes: obtaining a noisy level of a channel based on the number of first data received by a first terminal in a first period, where the first terminal is a STA or an AP in a wireless network, and the first data include aggregation frames or non-aggregation frames; and if the noisy level is greater than or equal to a noisy level threshold, controlling the first terminal to start up the RTS/CTS mechanism when data is transmitted in a second period which is following and adjacent to the first period along a time axis. The noisy level of the channel may be obtained in real time, and the RTS/CTS mechanism may be controlled to be started up reasonably in real time, so that channel resources is utilized sufficiently, and a throughput rate is improved.

Claims

1. A method for controlling startup of a request to send/clear to send (RTS/CTS) mechanism, comprising:

obtaining, with a processor, a noisy level of a channel based on the number of first data received by a first terminal in a first period, where the first terminal is a station (STA) or an access point (AP) in a wireless network, and the first data comprise aggregation frames or non-aggregation frames; and

if the noisy level of the channel is greater than or equal to a noisy level threshold, controlling, with the processor, the first terminal to start up the RTS/CTS mechanism when the first terminal transmits data in a second period, and transmitting data using the RTS/CTS mechanism in the second period, where the second period is following and adjacent to the first period along a time axis.

2. The method according to claim 1, wherein the noisy level of the channel decreases with the increment of a first ratio calculated based on Equation (1),

A=C/B 

 

(1)

where A represents the first ratio, B represents the number of the first data received by the first terminal in the first period, and C represents the number of a portion of the first data received by the first terminal in the first period, where a MAC target address of the portion of the first data is the first terminal.

3. The method according to claim 1, wherein the noisy level of the channel is determined based on a norm of the noisy level of the channel, and the norm of the noisy level of the channel is determined by:

obtaining a first number, where the first number represents the number of physical layer protocol data units (PPDUs) received by the first terminal in the first period;

obtaining a second number, where the second number represents the number of Acknowledgement (ACK) frames or block ACK frames received by the first terminal in the first period;

obtaining a third number, where the third number represents the number of the first data received by the first terminal in the first period which are not ACK frames or block ACK frames and whose MAC target addresses are the first terminal; and

if the difference between the first number and the second number is greater than or equal to a first threshold, determining the norm of the noisy level of the channel based on Equation (2),

4. The method according to claim 3, further comprising:

if the difference between the first number and the second number is less than the first threshold, determining the norm of the noisy level of the channel to be zero.

5. The method according to claim 3, wherein the first threshold is within a range from 1 to 10.

6. The method according to claim 3, wherein the noisy level threshold is within a range from 0.8 to 1.

7. The method according to claim 4, wherein the first threshold is within a range from 1 to 10.

8. The method according to claim 4, wherein the noisy level threshold is within a range from 0.8 to 1.

9. The method according to claim 1, wherein the noisy level threshold is within a range from 0.8 to 1.

10. The method according to claim 1, wherein the first period and the second period are within a range from 100 ms to 500 ms.

11. An apparatus for controlling startup of a request to send/clear to send (RTS/CTS) mechanism, comprising:

a noisy level determination circuitry, configured to obtain a noisy level of a channel based on the number of first data received by a first terminal in a first period, where the first terminal is a station (STA) or an access point (AP) in a wireless network, and the first data comprise aggregation frames or non-aggregation frames;

a controlling circuitry, configured to;

if the noisy level of the channel is greater than or equal to a noisy level threshold, control the first terminal to start up the RTS/CTS mechanism when the first terminal transmits data in a second period, where the second period is following and adjacent to the first period along a time axis; and

a transmitting circuitry, configured to;

transmit data using the RTS/CTS mechanism in the second period.

12. The apparatus according to claim 11, wherein the noisy level of the channel decreases with the increment of a first ratio calculated based on Equation (1),

A=C/B 

 

(1)

where A represents the first ratio, B represents the number of the first data received by the first terminal in the first period, and C represents the number of a portion of the first data received by the first terminal in the first period, where a MAC target address of the portion of the first data is the first terminal.

13. The apparatus according to claim 11, wherein the noisy level determination circuitry is configured to determine the noisy level of the channel based on a norm of the noisy level of the channel, and comprises:

a physical layer protocol data unit (PPDU) statistic circuitry, configured to;

obtain a first number, where the first number represents the number of PPDUs received by the first terminal in the first period;

an Acknowledgement (ACK) statistic circuitry, configured to;

obtain a second number, where the second number represents the number of ACK frames or block ACK frames received by the first terminal in the first period;

a first data statistic circuitry, configured to;

obtain a third number, where the third number represents the number of the first data received by the first terminal in the first period which are not ACK frames or block ACK frames and whose MAC target addresses are the first terminal; and

a first determination circuitry, configured to;

if the difference between the first number and the second number is greater than or equal to a first threshold, determine the norm of the noisy level of the channel based on Equation (2),

14. The apparatus according to claim 13, wherein the noisy level determination circuitry further comprises a second determination circuitry, configured to:

if the difference between the first number and the second number is less than the first threshold, determine the norm of the noisy level of the channel to be zero.

15. The apparatus according to claim 11, wherein the noisy level threshold is within a range from 0.8 to 1.