METHOD AND APPARATUS FOR TRANSMITTING FRAMES
A method for transmitting frames by a device in a wireless local area network is provided. The method includes transmitting a first frame including a recommended transmission rate and receiving a second frame transmitted as a response of the first frame, in which the second frame is transmitted at a rate determined based on the recommended transmission rate.
1 . A method for transmitting frames by a device in a wireless local area network, the method comprising:
transmitting a first frame including a recommended transmission rate; and
receiving a second frame transmitted as a response of the first frame,
wherein the second frame is transmitted at a rate determined based on the recommended transmission rate.
2 . The method of claim 1 , wherein:
the recommended transmission rate is included in a transmission rate recommendation field, and
the transmission rate recommendation field is included in a PHY header or a MAC header of the first frame.
3 . The method of claim 2 , wherein:
the transmission rate recommendation field is included in a signal field of the first frame.
4 . The method of claim 2 , wherein:
the transmission rate recommendation field
includes a value indicating a designated transmission rate or modulation and coding scheme (MCS) index.
5 . The method of claim 1 , wherein:
a duration field of the first frame includes a duration value, and
the duration value is determined based on a transmission time of the second frame transmitted at the recommended transmission rate.
6 . The method of claim 5 , wherein:
a legacy signal (L-SIG) field of the first frame includes a data length, and
the data length is determined based on the first frame and the transmission time of the second frame transmitted at the recommended transmission rate.
7 . The method of claim 1 , further comprising:
determining the recommended transmission rate based on an interference condition.
8 . The method of claim 7 , wherein:
in the determining of the recommended transmission rate,
when an interference level is equal to or more than a first reference value, the recommended transmission rate is determined as a lower rate than a basic rate or when the interference level is equal to or less than a second reference value, the recommended transmission rate is determined as a higher rate than the basic rate,
the second reference value is a smaller than the first reference value, and
the basic rate is the highest rate among a basic transmission rate set of a basic service set (BSS) while being equal to or less than a transmission rate of the first frame.
9 . A method for transmitting frames by a device in a wireless local area network, the method comprising:
receiving a first frame including a recommended transmission rate; and
transmitting a second frame at a transmission rate determined based on the recommended transmission rate.
10 . The method of claim 9 , wherein:
the recommended transmission rate is included in a transmission rate recommendation field of the first frame, and
the transmission rate recommendation field is included in a PHY header or a MAC header of the first frame.
11 . The method of claim 10 , wherein:
the transmission rate recommendation field is included in a signal field of the first frame.
12 . The method of claim 9 , wherein:
a transmission rate recommendation field
includes a value indicating a designated transmission rate or modulation and coding scheme (MCS) index.
13 . The method of claim 9 , wherein:
the transmission rate of the second frame is determined as a same rate as the recommended transmission rate.
14 . The method of claim 9 , wherein:
the transmission rate of the second frame is determined as a higher rate or lower rate than the recommended transmission rate.
15 . A wireless local area network (WLAN) device, comprising:
a processor generating a first frame including a recommended transmission rate; and
a transceiver transmitting the first frame and receiving a second frame transmitted as a response of the first frame,
wherein the second frame is transmitted at a rate determined based on the recommended transmission rate.
16 . The WLAN device of claim 15 , wherein:
the processor
inserts the recommended transmission rate into a designated field of the first frame.
17 . The WLAN device of claim 15 , wherein:
the processor
calculates a transmission time of the second frame transmitted at the recommended transmission rate and sets a duration value of a duration field of the first frame based on the transmission time.
18 . The WLAN device of claim 15 , wherein:
the processor
calculates the first frame and a transmission time of the second frame transmitted at the recommended transmission rate and sets a data length of a legacy signal (L-SIG) field of the first frame based on the transmission time.
19 . The WLAN device of claim 15 , wherein:
the processor
determines the recommended transmission rate based on an interference condition.
20 . The WLAN device of claim 19 , wherein:
the processor
determines a lower rate than a basic rate as the recommended transmission rate when an interference level is equal to or more than a first reference value or determines a higher rate than the basic rate as the recommended transmission rate when the interference level is equal to or less than a second reference value,
the second reference value is smaller than the first reference value, and
the basic rate is the highest rate among a basic transmission rate set of a basic service set (BSS) while being equal to or less than a transmission rate of the first frame.