CPC H04W 74/085 (2013.01) [H04L 5/0007 (2013.01); H04L 5/0091 (2013.01); H04W 72/0446 (2013.01); H04W 72/21 (2023.01); H04W 74/004 (2013.01); H04W 74/0833 (2013.01); H04W 76/11 (2018.02)] | 7 Claims |
1. An integrated circuit to control a process of a communication apparatus that is a 20 MHz operating station, the integrated circuit comprising:
at least one input, which, in operation, receives an input; and
control circuitry coupled to the at least one input, which, in operation, controls the process comprising:
receiving a Trigger frame for allocating resource units (RU(s)) for random access and another frame including a Random Access parameter element that comprises a first field indicating an OFDMA contention window (OCW) minimum value (OCWmin), wherein the RU(s) include at least one RU that is restricted from being used for the 20 MHz operating station; and
controlling an Uplink OFDMA-based Random Access (UORA) procedure using the OCWmin, the UORA procedure including:
setting an OFDMA Back-Off (OBO) counter to zero in a case where when the OBO counter is not greater than a number of available RU(s) for random access in the Trigger frame, the available RU(s) being RU(s) unrestricted from being used for the 20 MHz operating station; and
decrementing the OBO counter by the number of the available RU(s) for random access in a case where the OBO counter is greater than the number of available RU(s) for random access.
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