Joint Trigger Frame Transmission for Multi-AP Uplink Coordination
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Solution Overview
Problem
In multi-access point wireless communication networks, existing uplink multi-user transmission procedures face challenges in accurately determining the transmit power of physical layer protocol data units due to overlapping communications, leading to potential interference and reduced signal quality.
Innovation Solution
The solution involves providing an indication of the presence or absence of overlapping communications, allowing wireless devices to determine their transmission power based on this indication, and using joint trigger frames initiated by a master access point to coordinate transmissions among multiple access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple access points transmit trigger frames simultaneously in a joint trigger frame transmission, then transmission efficiency and productivity are improved, but interference between overlapping communications increases and measurement precision of transmit power deteriorates
Solution Approach 1:
The patent introduces a reference signal as an intermediary element that enables accurate transmit power measurement despite overlapping transmissions. The reference signal is transmitted with known power characteristics, allowing receiving devices to measure and determine the actual transmit power of each access point by comparing the received reference signal power with expected power levels, thus resolving the interference measurement problem while maintaining simultaneous joint transmission efficiency
2Reliability
If access points transmit trigger frames jointly to coordinate uplink multi-user transmissions, then transmission coordination and signal quality are improved, but device complexity increases due to need for overlapping communication indication
Solution Approach 1:
The patent merges the trigger frame transmission function across multiple access points into a single coordinated joint trigger frame transmission. By combining the trigger frames from multiple access points into one unified transmission structure with shared reference signals, the system achieves improved signal quality and coordination while avoiding the complexity of managing separate trigger frame transmissions from each access point individually
Data Source
AI summary
An access point may communicate with a wireless device, such as a station. The wireless device may receive a first and second physical layer protocol data unit from one or more access points. A power for transmitting a third physical layer protocol data unit to a first access point, based on the indication of presence or absence of the second physical layer protocol data unit, may be determined by the wireless device.