Wireless communication device and wireless communication method for providing opportunity of fair transmission to terminals
According to one embodiment, a wireless communication device includes a transmitter configured to transmit a first frame including information to specify a plurality of frequency components; and controlling circuitry configured to determine whether a second frame is received via each of the plurality of frequency components. The transmitter is configured to transmit a third frame including first information concerning a first value range which is used to determine whether to respond to the first frame, the first value range being dependent on a number of frequency components via which the second frame has been received.
1. A wireless communication device comprising:
a receiver configured to receive a first type of frame for UL-OFDMA (Uplink Orthogonal Frequency Division Multiple Access) random access including first information that specifies a plurality of frequency components;
controlling circuitry configured to determine whether to respond to the first type of frame, based on a first value selected randomly from a first value range and a number of the plurality of frequency components; and
a transmitter configured to, in response to determining to respond to the first type of frame, select one frequency component from the plurality of frequency components and transmit a second type of frame for response to the first type of frame using the selected frequency component, wherein
the controlling circuitry is configured to determine whether transmission of the second type of frame has succeeded or failed, and adjust the first value range based on a result of determining whether transmission of the second type of frame has succeeded or failed,
the first information includes information relating to the number of the plurality of frequency components,
the controlling circuitry is configured to specify the plurality of frequency components based on the first information,
the first type of frame includes second information designating a certain terminal to transmit the second type of frame using a second frequency component different from the plurality of frequency components for the UL-OFDMA random access,
the controlling circuitry is configured to
determine whether the wireless communication device is designated in the second information as the certain terminal,
in response to a determination that the wireless communication device is not designated in the second information as the certain terminal, determine whether to respond to the first type of frame based on the first value and the number of the plurality of frequency components, and
in response to a determination that the wireless communication device is designated in the second information as the certain terminal, not determine whether to respond to the first type of frame based on the first value and the number of the plurality of frequency components, and
the transmitter is configured to
in response to a determination that the wireless communication device is designated in the second information as the certain terminal, transmit the second type of frame using the second frequency component.
2. The wireless communication device according to claim 1 , wherein
the controlling circuitry is configured to determine whether to respond to the first type of frame based on the first value and the number of the plurality of frequency components only when the wireless communication device has a request for uplink transmission.
3. The wireless communication device according to claim 1 , wherein,
the controlling circuitry is configured to select the first value from the first value range only when the wireless communication device has a request for uplink transmission.
4. The wireless communication device according to claim 1 , wherein,
the first value range is a contention window for UL-OFDMA and
the first value is a back off count value randomly selected from the contention window for UL-OFDMA.
5. A wireless communication method comprising:
receiving a first type of frame for UL-OFDMA (Uplink Orthogonal Frequency Division Multiple Access) random access including first information to specify a plurality of frequency components wherein the first information includes information that specifies a number of the plurality of frequency components;
determining whether to respond to the first type of frame, based on a first value selected randomly from a first value range and the number of the plurality of frequency components;
specifying the frequency components based on the information included in the first information, and in response to determining to respond to the first type of frame, selecting one frequency component from the plurality of frequency components;
transmitting a second type of frame for response to the first type of frame for using the selected frequency component;
determining whether transmission of the second type of frame has succeeded or failed; and
adjusting the first value range based on a result of determining whether transmission of the second type of frame has succeeded or failed,
wherein the first type of frame includes second information designating a certain terminal to transmit the second type of frame using a second frequency component different from the plurality of frequency components for the UL-OFDMA random access,
the method comprises
determining whether the wireless communication device is designated in the second information as the certain terminal,
in response to a determination that the wireless communication device is not designated in the second information as the certain terminal, determining whether to respond to the first type of frame based on the first value and the number of the plurality of frequency components,
in response to a determination that the wireless communication device is designated in the second information as the certain terminal, not determining whether to respond to the first type of frame based on the first value and the number of the plurality of frequency components, and
in response to a determination that the wireless communication device is designated in the second information as the certain terminal, transmitting the second type of frame using the second frequency component.
6. The wireless communication device according to claim 1 , wherein
the first type of frame has an AID (Association ID) field, and the second information is included in the AID field.
7. The wireless communication device according to claim 1 , wherein
the first type of frame has an AID field, and
a second value indicating that the plurality of frequency components can be used for the UL-OFDMA (Uplink Orthogonal Frequency Division Multiple Access) random access is included in the AID field.
8. The wireless communication device according to claim 7 , wherein the second value is a value defined beforehand by a standard.
9. The wireless communication device according to claim 7 , wherein the second value is a value of an AID not assigned to any terminal.
10. The wireless communication device according to claim 7 , wherein
the first type of frame includes at least one terminal information field,
the terminal information field includes the AID field and a first field, and
one of the plurality of frequency components is included in the first field.
11. The wireless communication device according to claim 7 , wherein
the terminal information field further includes a second field, and
information to specify at least one of a MCS (Modulation and Coding Scheme) or a transmission power for the UL-OFDMA is included in the second field.
12. The wireless communication device according to claim 1 , further comprising at least one antenna.
13. The wireless communication device according to claim 1 , further comprising a memory.
14. The wireless communication device according to claim 1 , further comprising a CPU (Central Processing Unit).
15. The wireless communication device according to claim 1 , further comprising a display.