Wireless communication device, wireless communication terminal and wireless communication method
A wireless communication device is described. The wireless communication device includes a transmitter configured to transmit a first frame including first information required for uplink multi-user transmission without receiving a transmission request for the first information. The wireless communication device includes a receiver configured to receive a second frame. A wireless communication terminal is also described.
1. A wireless communication device, comprising:
a transmitter configured to transmit a first frame including first information required for generation of a trigger frame for uplink multi-user transmission, wherein the transmitter accesses a wireless medium using an access category associated with the first frame under CSMA/CA (Carrier Sense Multiple Access with Carrier Avoidance) to transmit the first frame, and the access category associated with the first frame is one of a plurality of access categories; and
a receiver configured to
receive an acknowledgement frame for the first frame in a first interframe space after the first frame is transmitted, and
receive a second frame designating at least one terminal which is a target of the uplink multi-user transmission, wherein the second frame is the trigger frame,
wherein the transmitter is configured to transmit a third frame in the uplink multi-user transmission when the wireless communication device is designated in the second frame, and
the first information includes:
information indicating amounts of data in a plurality of buffers corresponding to the plurality of access categories; and
information indicating an access category having a highest transmission priority among the plurality of access categories for the uplink multi-user transmission wherein the access category having the highest transmission priority is an access category most desirable to transmit by the wireless communication device and is selected from the plurality of access categories by the wireless communication device.
2. The wireless communication device according to claim 1 , wherein
the uplink multi-user transmission is at least one of frequency multiplexing transmission or spatial multiplexing transmission.
3. The wireless communication device according to claim 1 , wherein
the first information includes information relating to presence or non-presence of a transmission request for the uplink multi-user transmission or a data amount remaining for transmission or both.
4. The wireless communication device according to claim 1 , wherein
the first information includes, for each of the plurality of access categories, information relating to presence or non-presence of data for transmission or a data amount remaining for transmission or both.
5. The wireless communication device according to claim 1 , wherein
the first information includes information relating to priority of transmission for each of the plurality of access categories.
6. The wireless communication device according to claim 1 , wherein
the first information includes information relating to at least one of: a communication scheme of the uplink multi-user transmission desired by the wireless communication device or a resource desired to be used by the wireless communication device in the uplink multi-user transmission.
7. The wireless communication device according to claim 1 , wherein
the transmitter is configured to transmit the first frame on the basis of an access right acquired on the basis of CSMA/CA.
8. The wireless communication device according to claim 1 , wherein
the transmitter is configured to transmit, when the wireless communication device is designated in the second frame and does not have data for transmission, a fourth frame having a predetermined format after a predetermined time from reception of the second frame or nothing is transmitted.
9. The wireless communication device according to claim 1 , further comprising at least one antenna.
10. The wireless communication device according to claim 1 , wherein the plurality of access categories include at least one of background, best effort, video, or voice.
11. A wireless communication terminal comprising:
at least one antenna;
a receiver coupled to the antenna and receiving a first frame;
a transmitter coupled to the antenna and transmitting a second frame;
a communication processor coupled to the receiver and the transmitter;
a network processor coupled to the communication processor, transmitting data to the communication processor and receiving data from another device; and
a memory device coupled to the network processor and caching first data from the other device, wherein
the communication processor is configured to control the transmitter to transmit through the antenna a third frame including first information required for generation of a trigger frame of uplink multi-user transmission, wherein the transmitter accesses a wireless medium using an access category associated with the third frame under CSMA/CA (Carrier Sense Multiple Access with Carrier Avoidance) to transmit the third frame, and the access category associated with the third frame is one of a plurality of access categories used in the CSMA/CA,
the receiver is configured to
receive an acknowledgement frame for the third frame in a first interframe space after the third frame is transmitted, and
receive a fifth frame designating at least one terminal which is a target of the uplink multi-user transmission wherein the fifth frame is the trigger frame,
the transmitter is configured to transmit a sixth frame in the uplink multi-user transmission when the wireless communication terminal is designated in the fifth frame,
the first information is information based on the first data cached in the memory device, and
the first information includes:
information indicating amounts of data in a plurality of buffers corresponding to the plurality of access categories; and
information indicating an access category having a highest transmission priority of the plurality of access categories for the uplink multi-user transmission, wherein the access category having the highest transmission priority is an access category most desirable to transmit by the wireless communication device and is selected from the plurality of access categories by the wireless communication terminal.
12. The wireless communication terminal according to claim 11 , wherein
the uplink multi-user transmission is at least one of frequency multiplexing transmission or spatial multiplexing transmission.
13. The wireless communication terminal according to claim 11 , wherein
the first information includes presence or non-presence of a transmission request for the uplink multi-user transmission or a data amount remaining for transmission or both.
14. The wireless communication terminal according to claim 11 , wherein
the first information includes, for each of the plurality of access categories, presence or non-presence of data for transmission or a data amount remaining for transmission or both.
15. The wireless communication terminal according to claim 11 , wherein
the first information includes information relating to priority of transmission for each of the plurality of access categories.
16. The wireless communication terminal according to claim 11 , wherein
the first information includes information relating to at least one of: a communication scheme of the uplink multi-user transmission desired by the wireless communication terminal and a resource desired to be used by the wireless communication terminal in the uplink multi-user transmission.
17. The wireless communication terminal according to claim 11 , wherein
the transmitter is configured to transmit the first frame on the basis of an access right acquired on the basis of CSMA/CA.
18. The wireless communication terminal according to claim 11 , wherein
when the wireless communication terminal is designated in the fifth frame and does not have data for transmission, the communication processor is configured to control to transmit a seventh frame having a predetermined format after a predetermined time from reception of the third frame or transmit nothing.
19. A wireless communication method by a wireless communication terminal, comprising:
caching first data from another device in a memory device;
generating a first frame including first information required for generation of a trigger frame of uplink multi-user transmission;
accessing a wireless medium using an access category associated with the third frame under CSMA/CA (Carrier Sense Multiple Access with Carrier Avoidance) and transmitting the first frame, wherein the access category associated with the first frame is one of a plurality of access categories used in the CSMA/CA;
receiving an acknowledgement frame for the first frame in a first interframe space after the first frame is transmitted;
receiving a second frame designating at least one terminal which is a target of the uplink multi-user transmission wherein the second frame is the trigger frame;
transmitting a third frame in the uplink multi-user transmission when the wireless communication terminal is designated in the second frame;
the first information is information based on the first data cached in the memory device and
the first information includes:
information indicating amounts of data in a plurality of buffers corresponding to the plurality of access categories; and
information indicating an access category having a highest transmission priority among the plurality of access categories for the uplink multi-user transmission, wherein the access category having the highest transmission priority is an access category most desirable to transmit by the wireless communication device and is selected from the plurality of access categories by the wireless communication terminal.