Reverse Direction Protocol TXOP Granting for MU-MIMO

The patent applies dynamics by enabling the TXOP holder identity to change dynamically during the transmission opportunity. After STA-a finishes its uplink transmission and grants remaining TXOP to AP, the AP becomes the new TXOP holder and can perform MU-MIMO downlink transmissions to multiple STAs simultaneously. This dynamic role transition allows the system to adaptively switch from single-user uplink to multi-user downlink transmission modes, resolving the contradiction between channel utilization improvement and MU-MIMO capability limitation.

The patent merges the reverse direction protocol mechanism with MU-MIMO technology to create a hybrid transmission scheme. The RDP provides the framework for handling asymmetrical traffic by allowing TXOP granting, while MU-MIMO is integrated to enable simultaneous multi-user downlink transmissions. This combination allows the AP to serve multiple STAs in parallel during the granted TXOP period, thereby increasing system throughput while maintaining the ability to handle asymmetrical traffic patterns.

The patent applies universality by enabling the granted TXOP to serve multiple functions. The AP, after receiving the granted TXOP from STA-a, can perform multiple downlink transmissions to different STAs (STA-b, STA-c, etc.) simultaneously using MU-MIMO technology. This multi-functional use of the granted TXOP time maximizes channel utilization while maintaining protocol flexibility, as the same time resource is efficiently allocated to serve multiple users in parallel rather than sequentially.