Wireless communication device, wireless communication terminal and wireless communication method
View Patent ↗According to one embodiment, a wireless communication device includes: a receiver configured to receive a plurality of first frames each including first information required for uplink multi-user transmission; and a transmitter configured to transmit a second frame generated on the basis of the first information included in the plurality of first frames. The transmitter does not transmit a transmission request for the first information before the first frames are received. The second frame is a frame instructing transmission of a third frame including data after a predetermined time from reception of the second frame.
1. A wireless communication device, comprising:
a receiver configured to receive a plurality of first frames each including first information required for generation of a trigger frame for uplink multi-user transmission; and
a transmitter configured to transmit a second frame generated on the basis of the first information included in the plurality of first frames, the second frame being the trigger frame and designating at least one target terminal for the uplink multi-user transmission, wherein
each of the first frames is transmitted by a respective one of terminals, and each of the terminals accesses a wireless medium using an access category associated with a first frame under CSMA/CA (Carrier Sense Multiple Access with Carrier Avoidance) to transmit the first frame,
the access category associated with the first frame is one of a plurality of access categories,
the second frame instructs the at least one target terminal to transmit third frames including data in elapse of a predetermined time after the second frame is received, and
the first information included in the plurality of first frames 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 each of the terminals and is one selected from the access categories by each of the terminals.
2. The wireless communication device according to claim 1 , wherein
the multi-user transmission is at least one of frequency multiplexing transmission or spatial multiplexing transmission.
3. The wireless communication device according to claim 1 , comprising a controller configured to determine at least one of a maximum length of the third frame or a maximum length of the data, and
the second frame includes information relating to the at least one of the maximum length of the third frame or the maximum length of the data.
4. The wireless communication device according to claim 1 , comprising a controller configured to select a plurality of target terminals for the multi-user transmission from the terminals and determine an access category of the data to each of the plurality of target terminals and
the second frame includes information designating the access category determined for each of the plurality of target terminals.
5. The wireless communication device according to claim 4 , wherein
the first information includes information relating to presence or non-presence of data for transmission for each of the plurality of access categories;
the controller is configured to select the plurality of target terminals from the terminals having data for transmission of a first access category of the plurality of access categories; and
the second frame includes information designating the first access category commonly for the plurality of target terminals.
6. The wireless communication device according to claim 4 , wherein
the first information includes information relating to a data amount for transmission for each of the plurality of access categories;
the controller is configured to select the plurality of target terminals on the basis of the data amount for transmission of a first access category of the plurality of access categories; and
the second frame includes information designating the first access category commonly for the plurality of target terminals.
7. The wireless communication device according to claim 4 , wherein
the first information includes information indicating priorities of transmission for a plurality of access categories;
the controller is configured to select the plurality of target terminals on the basis of the priority of a first access category of the plurality of access categories; and
the second frame includes information designating the first access category commonly for the plurality of target terminals.
8. The wireless communication device according to claim 4 , wherein
the access category is an access category or a traffic ID defined by IEEE 802.11 standard.
9. The wireless communication device according to claim 1 , comprising: a controller configured to select a plurality of target terminals for the multi-user transmission from the terminals wherein
the second frame includes information designating the plurality of target terminals;
the first information includes information indicating a communication scheme of the multi-user transmission desired by the terminals; and
the controller is further configured to select the plurality of target terminals from the terminals which have transmitted the first information indicating a first communication scheme.
10. The wireless communication device according to claim 1 , comprising a controller configured to
select a plurality of target terminals for the multi-user transmission from the terminals; and
determine communication resources used by the plurality of target terminals in the multi-user transmission, wherein
the second frame includes information designating the communication resources determined for the plurality of target terminals.
11. The wireless communication device according to claim 1 , comprising a controller configured to select a plurality of candidate terminals for the multi-user transmission from the terminals on the basis of the first information included in the plurality of first frames wherein
the transmitter is further configured to transmit a fourth frame for inquiring presence or non-presence of a request for the multi-user transmission to the plurality of candidate terminals.
12. The wireless communication device according to claim 11 , wherein
the controller is further configured to select a plurality of target terminals for the multi-user transmission from the candidate terminals which transmitted a fifth frame notifying that there is a request for the multi-user transmission in reply to the fourth frame.
13. The wireless communication device according to claim 1 , further comprising at least one antenna.
14. A wireless communication terminal comprising:
at least one antenna;
a receiver coupled to the at least one antenna and receiving a frame;
a transmitter coupled to the at least one antenna and transmitting a 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 receiver receives a plurality of first frames each including first information required for generation of a trigger frame for uplink multi-user transmission through the at least one antenna wherein each of the first frames is transmitted by a respective one of terminals, each of the terminals accesses a wireless medium using an access category associated with a 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;
the transmitter is further configured to transmit a second frame through the at least one antenna, the second frame being generated on the basis of the first information included in the plurality of first frames and the first data cached in the memory device, the second frame being the trigger frame and designating at least one target terminal for the uplink multi-user transmission; and
the second frame instructs the at least one target terminal to transmit third frames including data for the uplink multi-user transmissions in elapse of a predetermined time after the second frame is received, and
the first information included in the plurality of first frames 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 each of the terminals and is one selected from the access categories by each of the terminals.
15. The wireless communication terminal according to claim 14 , wherein
the multi-user transmission is at least one of frequency multiplexing transmission or spatial multiplexing transmission.
16. The wireless communication terminal according to claim 14 , wherein
the communication processor is configured to determine at least one of a maximum length of the third frame or a maximum length of the data; and
the second frame includes information indicating the at least one of the maximum length of the third frame or the maximum length of the data through the at least one antenna.
17. The wireless communication terminal according to claim 14 , wherein
the communication processor is configured to select a plurality of target terminals for the multi-user transmission from the terminals and determines an access category of the data to each of the plurality of target terminals; and
the second frame includes information designating the access category determined for each of the plurality of target terminals.
18. The wireless communication terminal according to claim 17 , wherein
the first information includes information indicating presence or non-presence of data for transmission for each of the plurality of access categories;
the communication processor is configured to select the plurality of target terminals from ones of the terminals which have data for transmission of a first access category in the plurality of access categories; and
the second frame includes information designating the first access category commonly for the plurality of target terminals.
19. The wireless communication terminal according to claim 17 , wherein
the first information includes information indicating a data amount for transmission for each of the plurality of access categories;
the communication processor is configured to select the plurality of target terminals on the basis of the data amount for transmission of a first access category of the plurality of access categories; and
the second frame includes information designating the first access category commonly for the plurality of target terminals.
20. A wireless communication method by a wireless communication terminal, comprising:
caching first data from another device in a memory device;
receiving a plurality of first frames each including first information required for generation of a trigger frame for uplink multi-user transmission wherein each of the first frames is transmitted by a respective one of terminals, each of the terminals accesses a wireless medium using an access category associated with a 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
transmitting a second frame, the second frame being generated on the basis of the first information included in the plurality of first frames and the first data cached in the memory device, the second frame being the trigger frame and designating at least one target terminal for the uplink multi-user transmission wherein
the second frame instructs the at least one target terminal to transmit third frames including data for the uplink multi-user transmission in elapse of a predetermined time after the second frame is received, and
the first information included in the plurality of first frames includes:
information indicating amounts of data in the 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 each of the terminals and is one selected from the access categories by each of the terminals.
21. wireless communication device according to claim 1 , comprising a controller configured to select the at least one target terminal from the terminals based on the first information included in the plurality of first frames, and
the receiver receives the third frames transmitted by multiuser multiplexing from the at least one target terminal in elapse of the predetermined time after the at least one target terminal receives the second frame.
22. The wireless communication device according to claim 1 , wherein the access categories include BACKGROUND, BEST EFFORT, VIDEO, and VOICE.