METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA BASED ON AGGRESSIVE SPATIAL REUSE

• US 20150351128A1
• Filed: 02/10/2015
• Published: 12/03/2015
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Jin Kyeong, JIN, Sung Geun
• Granted Patent: US 9,860,921 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/085 collision avoidance

Abstract

A method and apparatus for transmitting and receiving mobile data based on an ASR is provided. The mobile data transmission method of a first mobile terminal including transmitting a dRTS frame and creating an ASR list; performing channel access to a certain channel based on an ASR back-off process; transmitting an srDATA frame from the certain channel to a second mobile terminal based on the ASR list; and receiving an srACK frame from the second mobile terminal in response to the srDATA frame, wherein the certain channel is a channel to/from which a third mobile terminal transmits and receives a data frame, the srDATA frame and data frame are transmitted from the certain channel at a certain point, and the ASR list is information on a mobile terminal that does not collide with the data frame when the first mobile terminal transmits the srDATA frame and receives the srACK frame.

Claims

1. A mobile data transmission method of a first mobile terminal, the method comprising:

transmitting a dRTS (disruptive request to send) frame and creating an ASR (aggressive spatial reuse) list;

performing channel access to a certain channel based on an ASR back-off process;

transmitting an srDATA frame from the certain channel to a second mobile terminal based on the ASR list; and

receiving an srACK (acknowledgement) frame from the second mobile terminal in response to the srDATA frame,

wherein the certain channel is a channel to/from which a third mobile terminal transmits and receives a data frame,

the srDATA frame and data frame are transmitted from the certain channel at a certain point, and

the ASR list is information on a mobile terminal that does not collide with the data frame when the first mobile terminal transmits the srDATA frame and receives the srACK frame.

2. The method according to claim 1,

wherein the ASR back-off process is operated when a channel is busy,

the method further comprising:

choosing a random number N(N is a natural number) from an ASR contention window and deciding an ASR back-off time;

measuring a noise power as the ASR back-off time decreases; and

performing the channel access when the noise power does not exceed a threshold value until the ASR back-off time decreases to 0.

3. The method according to claim 1,

wherein a first ending time of transmission of the srDATA frame and a second ending time of transmission of the data frame are set to be the same, and

the srDATA frame comprises zero padded data when the second ending time of transmission is longer than the first ending time of transmission.

4. The method according to claim 3,

wherein information on the second ending time of transmission is obtained based on a duration field included in an RTS (request to send) frame that the third mobile terminal transmitted.

5. The method according to claim 1,

wherein when the first mobile terminal does not receive a response frame for or more than certain times from a certain mobile terminal that transmitted a frame, the ASR list is updated by deleting the certain mobile terminal.

6. The method according to claim 1,

wherein the transmitting a dRTS frame and creating an ASR list by the first mobile terminal comprises:

determining whether or not a collision occurred in a data frame being transmitted from another mobile terminal due to the dRTS frame; and

including the another mobile terminal into the ASR list when it is determined that a collision did not occur in the data frame.

7. A first mobile terminal that transmits mobile data,

wherein the first mobile terminal comprises:

an RF (radio frequency) unit that transmits and receives a mobile signal; and

a processor that is selectively connected to the RF unit and operates,

wherein the processor is configured to transmit a dRTS (disruptive request to send) frame and creates an ASR (aggressive spatial reuse) list,

perform channel access to a certain channel based on an ASR back-off process,

transmit an srDATA frame from the certain channel to a second mobile terminal based on the ASR list, and

receive an srACK (acknowledgement) frame from the second mobile terminal in response to the srDATA frame,

the certain channel being a channel through which a third mobile terminal transmits and receives a data frame,

the srDATA frame and the data frame being transmitted from the certain channel at a certain point, and

the ASR list being information on a mobile terminal that does not collide with the data frame when the first mobile terminal transmits the srDATA frame and receives the srACK frame.

8. The first mobile terminal according to claim 7,

wherein the ASR back-off process is operated when a channel is busy,

chooses a random number N(N is a natural number) from an ASR contention window and decides an ASR back-off time;

measures a noise power as the ASR back-off time decreases; and

performs the channel access when the noise power does not exceed a threshold value until the ASR back-off time decreases to 0.

9. The first mobile terminal according to claim 7,

wherein a first ending time of transmission of the srDATA frame and a second ending time of transmission of the data frame are set to be the same, and

the srDATA frame comprises zero padded data when the second ending time of transmission is longer than the first ending time of transmission.

10. The first mobile terminal according to claim 9,

wherein information on the second ending time of transmission is obtained based on a duration field included in an RTS (request to send) frame that the third mobile terminal transmitted.

11. The first mobile terminal according to claim 7,

wherein when the first mobile terminal does not receive a response frame for or more than certain times from a certain mobile terminal that transmitted a frame, the ASR list is updated by deleting the certain mobile terminal.

12. The first mobile terminal according to claim 7,

wherein the processor is configured to determine whether or not a collision occurred in a data frame being transmitted from another mobile terminal due to the dRTS frame, and

to include the another mobile terminal into the ASR list when it is determined that a collision did not occur in the data frame.