Method of determining transmission rate of control response frame for acknowledging data receipt in wireless LAN

• US 20060187852A1
• Filed: 02/07/2006
• Published: 08/24/2006
• Est. Priority Date: 02/07/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yang, Chil-youl, Kwon, Chang-yeul, Cho, Kyung-ik, Shin, Se-young
• Granted Patent: US 7,339,916 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• 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

A method is provided for determining a transmission rate of a control response frame for acknowledging data receipt in a wireless local area network. The method includes obtaining transmission parameters of a transmitting station from a data transmission frame received from the transmitting station, searching a receiving station for transmission parameters which correspond to the transmission parameters of the transmitting station, determining the transmission rate of the control response frame according to transmission parameters of the receiving station if the transmission parameters corresponding to the transmission parameters of the transmitting station are found in the receiving station, and determining a maximum rate among a set of basic transmission rates to be the transmission rate of the control response frame if the transmission parameters corresponding to the transmission parameters of the transmitting station are not found in the receiving station.

Claims

1. A method of determining a transmission rate of a control response frame for acknowledging data receipt in a wireless local area network where high throughput stations and legacy stations with different data transmission capabilities coexist, the method comprising:

obtaining transmission parameters of a transmitting station from a data transmission frame received from the transmitting station;

searching a receiving station for transmission parameters of the receiving station which correspond to the transmission parameters of the transmitting station; and

determining the transmission rate of the control response frame based on a result of the searching.

2. The method of claim 1, wherein, in the determining the transmission rate, if the transmission parameters corresponding to the transmission parameters of the transmitting station are found in the receiving station, the transmission rate of the control response frame is determined according to the transmission parameters of the receiving station, and if the transmission parameters corresponding to the transmission parameters of the transmitting station are not found in the receiving station, a maximum rate among a set of basic transmission rates included in the receiving station is determined to be the transmission rate of the control response frame.

3. The method of claim 2, wherein, in the obtaining transmission parameters of the transmitting station, if the data transmission frame received from the transmitting station is a high throughput physical layer (PHY) packet data unit frame, the transmission parameters of the transmitting station are obtained from a signal field of the high throughput PHY packet data unit frame with reference to a modulation coding scheme index.

4. The method of claim 2, wherein, in the obtaining transmission parameters of the transmitting station, if the data transmission frame received from the transmitting station is a legacy physical layer (PHY) packet data unit frame, the transmission parameters of the transmitting station are obtained from a signal field of the legacy PHY packet data unit frame with reference to a rate field.

5. The method of claim 3, wherein, in the searching the receiving station for transmission parameters, the receiving station is searched for transmission parameters corresponding to a legacy format among the transmission parameters of the receiving station, which correspond to the transmission parameters of the transmitting station.

6. The method of claim 2, wherein the determining the transmission rate comprises:

determining whether the transmitting station supports the transmission rate of the control response frame determined according to the transmission parameters of the receiving station if the transmission parameters corresponding to the transmission parameters of the transmitting station are found in the receiving station; and

determining the transmission rate of the control response frame based on a result of the determining whether the transmitting station supports the transmission rate of the control response frame.

7. The method of claim 6, wherein, in the determining the transmission rate of the control response frame based on a result of the determining whether the transmitting station supports the transmission rate of the control response frame, if the receiving station supports the determined transmission rate, the determined transmission rate of the control response frame is used, and if the receiving station does not support the determined transmission rate, the maximum rate among the set of basic transmission rates is determined to be the transmission rate of the control response frame.

8. The method of claim 1, wherein the transmission parameters comprise at least one of a number of spatial streams, a modulation scheme, and a coding rate.

9. The method of claim 1, wherein the control response frame has a legacy format.

10. The method of claim 9, wherein the control response frame is a clear-to-send frame or an acknowledgement frame.

11. The method of claim 1, wherein the high throughput stations comprise systems that use multiple-input-multiple-output technology.

12. The method of claim 1, wherein the high throughput stations comprise systems that use channel bonding.

13. The method of claim 1, wherein the legacy stations comprise systems that meet an IEEE 802.11 a/b/g standard.

14. A computer-readable recording medium on which a program is recorded for executing a method of determining a transmission rate of a control response frame for acknowledging data receipt in a wireless local area network where high throughput stations and legacy stations with different data transmission capabilities coexist, the method comprising:

obtaining transmission parameters of a transmitting station from a data transmission frame received from the transmitting station;

searching a receiving station for transmission parameters of the receiving station which correspond to the transmission parameters of the transmitting station; and

determining the transmission rate of the control response frame based on a result of the searching.