Wireless LAN system, wireless LAN base station, wireless LAN terminal, and communication method

1. A communication method of a wireless local area network (LAN) base station configured to perform uplink multi-user communication with a plurality of wireless LAN terminals, wherein

an association identifier (AID) indicating an associated wireless LAN terminal includes a specific bit generated by using a basic service set (BSS) color bit (BCB), and

the communication method comprises:

generating an unassociation identifier (UAID) indicating an unassociated wireless LAN terminal, in order to include the specific bit or a processed bit obtained by processing the specific bit; and

using a bit to be distinguished from the AID as a bit other than the specific bit of the UAID in a case where the specific bit is included in the UAID.

2. The communication method according to claim 1 , wherein the processed bit is a bit obtained by inverting the specific bit.

3. The communication method according to claim 1 , wherein the processed bit is a bit obtained by adding a predetermined value to the specific bit, subtracting the predetermined value from the specific bit, multiplying the specific bit with the predetermined value, or dividing the specific bit by the predetermined value.

4. The communication method according to claim 1 , wherein, in a case where the specific bit is included in the UAID, the bit other than the specific bit of the UAID is a bit of a value within a range different from a range of a value used by the AID.

5. A communication method of a wireless local area network (LAN) base station configured to perform uplink multi-user communication with a plurality of wireless LAN terminals, the communication method comprising:

transmitting a trigger frame to the plurality of wireless LAN terminals, the trigger frame including information and a base value, the information indicating a resource unit for random access, and the base value being a signaling parameter of an unassociation identifier (UAID) indicating an unassociated wireless LAN terminal;

receiving uplink data from the unassociated wireless LAN terminal, the uplink data being transmitted by using the resource unit for random access indicated by the information included in the trigger frame; and

generating the UAID by using the base value of the UAID and the information indicating the order of the resource unit for random access among resource units for random access, the resource unit for random access being used to transmit the uplink data.

6. The communication method according to claim 5 , further comprising:

calculating a new base value of the UAID by incrementing the base value of the UAID by a number of the resource units for random access indicated by the information included in the trigger frame; and

generating a next trigger frame including the new base value of the UAID.

7. The communication method according to claim 5 , further comprising not transmitting an acknowledgement (ACK) frame for uplink data to the unassociated wireless LAN terminal, the uplink data being received from the unassociated wireless LAN terminal designated by the conflicting UAID, in a case where the generated UAID conflicts.

8. A communication method of a wireless local area network (LAN) terminal of a plurality of wireless LAN terminals configured to perform uplink multi-user communication with the wireless LAN base station, wherein

an association identifier (AID) indicating an associated wireless LAN terminal includes a specific bit generated by using a basic service set (BSS) color bit (BCB), and

the communication method comprises:

generating an unassociation identifier (UAID) indicating the wireless LAN terminal, in order to include the specific bit or a processed bit obtained by processing the specific bit in a case where the wireless LAN terminal is an unassociated wireless LAN terminal; and

using a bit to be distinguished from the AID as a bit other than the specific bit of the UAID in a case where the wireless LAN terminal is the unassociated wireless LAN terminal and the specific bit is included in the UAID.

9. The communication method according to claim 8 , wherein the processed bit is a bit obtained by inverting the specific bit.

10. The communication method according to claim 8 , wherein the processed bit is a bit obtained by adding a predetermined value to the specific bit, subtracting the predetermined value from the specific bit, multiplying the specific bit with the predetermined value, or dividing the specific bit by the predetermined value.

11. The communication method according to claim 8 , wherein, in a case where the specific bit is included in the UAID, the bit other than the specific bit of the UAID is a bit of a value within a range different from a range of a value used by the AID.

12. A communication method of a wireless local area network (LAN) terminal of a plurality of wireless LAN terminals configured to perform uplink multi-user communication with the wireless LAN base station, the communication method comprising:

receiving a trigger frame from the wireless LAN base station, the trigger frame including information and a base value, the information indicating a resource unit for random access, and the base value being a signaling parameter of an unassociation identifier (UAID) indicating an unassociated wireless LAN terminal;

generating the UAID indicating the wireless LAN terminal by using the base value of the UAID included in the trigger frame, and information indicating an order of a resource unit for random access among resource units for random access in a case where the wireless LAN terminal is the unassociated wireless LAN terminal, the resource unit for random access being indicated by the information included in the trigger frame; and

transmitting uplink data to the wireless LAN base station by using the resource unit for random access indicated by the information included in the trigger frame in a case where the wireless LAN terminal is the unassociated wireless LAN terminal.

13. The communication method according to claim 12 , further comprising performing uplink communication that does not need the UAID with the wireless LAN base station, in a case where the wireless LAN terminal is an unassociated wireless LAN terminal and the wireless LAN terminal does not receive the ACK frame from the wireless LAN base station after transmitting the uplink data to the wireless LAN base station.