Wireless communication device

1. A wireless communication device, comprising:

a receiver configured to receive a first frame for requesting transmission permission, wherein a transmitter address of the first frame is an address of a first wireless communication device, a receiver address of the first frame is an address of the wireless communication device, a beginning bit of the transmitter address is zero and the first frame is a MAC (Medium Access Control) frame; and

a transmitter configured to transmit a second frame for permission of requested transmission a predetermined time of period after the first frame is received in response to receipt of the first frame, wherein the transmitter generates the second frame under one address process selected from a first address process and a second address process, and the second frame is a MAC (Medium Access Control) frame,

wherein the first address process is a process to set a bit string in which a beginning bit is one and a first region in a remaining region other than the beginning bit indicates a predetermined first value in a receiver address field of the second frame,

the second address process is a process to copy a value in a transmitter address field of the first frame and set the copied value in the receiver address field of the second frame,

a beginning bit of addresses of the first wireless communication device and a second wireless communication device each is zero,

the second wireless communication device is capable of receiving the second frame, and

the bit string is identifiable by the first wireless communication device and the second wireless communication device and

the transmitter is further configured to

select the first address process if a multi-user multiplexing transmission of the first wireless communication device and the second wireless communication device is permitted, generate the second frame under the first address process and transmit the second frame and

select the second address process if a single user transmission of only the first wireless communication device is permitted, generate the second frame under the second address process and transmit the second frame.

2. The wireless communication device according to claim 1 ,

wherein the receiver is configured to receive a plurality of third frames transmitted through a multi-user multiplexing after the transmitter transmits the second frame generated under the first address process, wherein the multi-user multiplexing is a spatial multiplexing or OFDMA (Orthogonal Frequency Division Multiple Access).

3. The wireless communication device according to claim 2 ,

wherein the transmitter is configured to transmit a fourth frame including information indicating whether the plurality of third frames are successfully received,

wherein the transmitter sets one at a beginning bit of a receiver address field of the fourth frame.

4. The wireless communication device according to claim 1 ,

when a value at a beginning bit in the transmitter address field of the first frame is one, the second address process changes the value at the beginning bit in the transmitter address field of the first frame to zero and sets the changed value in the receiver address field of the second frame.

5. The wireless communication device according to claim 1 , further comprising at least one antenna.

6. The wireless communication device according to claim 1 , wherein the predetermined time of period is a short inter frame space (SIFS).

7. The wireless communication device according to claim 1 , wherein a beginning bit of addresses of all of a plurality of wireless communication devices existing in a communication area of the wireless communication device is zero.

8. A wireless communication device, comprising:

a receiver configured to receive a first frame and a second frame transmitted through a multi-user multiplexing,

wherein the multi-user multiplexing is a spatial multiplexing or OFDMA (Orthogonal Frequency Division Multiple Access),

wherein a transmitter address of the first frame is an address of a first wireless communication device and a receiver address of the first frame is an address of the wireless communication device,

wherein a transmitter address of the second frame is an address of a second wireless communication device and a receiver address of the second frame is the address of the wireless communication device; and

a transmitter configured to generate a third frame under a first address process in response to receipt of the first frame and the second frame and transmit the third frame a predetermined time of period after the first frame and the second frame are received to the first wireless communication device and the second wireless communication device, wherein the third frame includes information indicating whether the first frame and the second frame are successfully received, and the third frame is a MAC (Medium Access Control) frame,

wherein the first address process is a process to set a bit string in which a beginning bit is one and a first region in a remaining region other than the beginning bit indicates a predetermined first value, in a receiver address field of the third frame, and

wherein

the bit string is identifiable by the first wireless communication device and the second wireless communication device.

9. A wireless communication device, comprising:

a receiver configured to receive, in a response to a first frame for requesting transmission permission, a second frame for permission of requested transmission,

wherein the second frame is transmitted a predetermined period of time after the first frame is received, and

wherein the first frame and the second frame each is a MAC (Medium Access Control) frame;

a controller configured to determine whether a beginning bit in a receiver address field in the second frame is one wherein a transmitter device of the second frame sets a bit string in which a beginning bit is one and a first region in a remaining region other than the beginning bit indicates a predetermined first value, in a receiver address field of the second frame; and

a transmitter,

wherein a beginning bit of addresses of the wireless communication device and a first wireless communication device is zero,

wherein the first wireless communication device is capable of receiving the second frame and is different from the wireless communication device, and

wherein the bit string is identifiable by the wireless communication device and the first wireless communication device,

wherein the transmitter is configured to transmit a third frame even during a period of time in which the transmitter is prohibited from transmitting any frame if the transmitter identifies at least that the beginning bit of the bit string in the receiver address field in the second frame is one, and

wherein the third frame is multi-user multiplexed with a fourth frame transmitted from the first wireless communication device which has received the second frame and identified at least that the beginning bit of the bit string is one.

10. The wireless communication device according to claim 9 ,

wherein the multi-user multiplexing is a spatial multiplexing or OFDMA (Orthogonal Frequency Division Multiple Access).

11. The wireless communication device according to claim 10 ,

wherein the transmitter is configured to transmit the first frame, and

wherein the transmitter sets the address of the wireless communication device in a transmitter address field of the first frame to be transmitted and sets the transmitter address of the second frame in a receiver address field of the first frame to be transmitted.

12. The wireless communication device according to claim 11 ,

wherein the receiver is configured to receive the second frame after the transmitter transmits the first frame, and

the transmitter is configured to not retransmit the first frame even when the address of the wireless communication device is not set in a receiver address field of the second frame.

13. The wireless communication device according to claim 9 ,

wherein the receiver is configured to receive a fifth frame after the transmitter transmits the third frame, and

when one is set at the beginning bit in a receiver address field of the fifth frame, the controller is configured to determine that the fifth frame includes acknowledgement information of the wireless communication device and the first wireless communication device, identify the acknowledgement information of the wireless communication device in the fifth frame, and verifies whether the third frame is successfully transmitted based on the identified acknowledgement information.

14. The wireless communication device according to claim 9 , further comprising at least one antenna.