InterDigital has been granted a patent for methods and systems for transmit power control in a WLAN. The patent describes a scheme where an access point (AP) sends a trigger frame to multiple stations (STAs) for synchronizing and scheduling uplink multi-user transmissions. The STAs estimate pathloss and adjust their transmit power to match the target receive power at the AP. The patent also covers an AP that transmits the trigger frame and receives uplink multi-user transmissions from the STAs. GlobalData’s report on InterDigital gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on InterDigital, Cloud gaming was a key innovation area identified from patents. InterDigital's grant share as of September 2023 was 46%. Grant share is based on the ratio of number of grants to total number of patents.
Transmit power control scheme for wlan ul mu transmission
A recently granted patent (Publication Number: US11778567B2) describes an access point (AP) with specific capabilities for uplink (UL) multi-user (MU) transmission in wireless communication networks. The AP includes a transceiver and a processor that work together to enable efficient communication with multiple stations (STAs).
The AP is designed to transmit a trigger frame to the STAs, which includes important information for UL MU transmission. This trigger frame includes indications of resource units (RUs) that the STAs can use for their UL MU transmission, as well as details about the transmit power used by the AP to send the trigger frame. Additionally, the trigger frame includes indications of the expected receive signal power at the AP for specific STAs. This information helps optimize the communication process.
The AP is also capable of receiving UL MU transmissions from the STAs using the indicated RUs. In response to these transmissions, the AP can transmit an acknowledgement frame back to the STAs. This acknowledgement frame can be a multi-STA acknowledgement frame or a block acknowledgement frame, and it is sent to at least two of the STAs.
The trigger frame is transmitted using orthogonal frequency-division multiple access (OFDMA), a technique that allows for efficient sharing of the available frequency spectrum. The indications of expected receive signal power for different STAs can have different values or the same value, depending on the specific implementation.
The UL MU transmission from the STAs is received by the AP after a Short Interframe Space (SIFS) time following the transmission of the trigger frame. The UL MU transmission can include multiple MU physical protocol data units (PPDUs) received from multiple STAs.
The trigger frame also includes identifications of the STAs that are triggered for the UL MU transmission, providing a clear indication of which STAs should participate in the transmission.
Overall, this patent describes an access point with enhanced capabilities for UL MU transmission, improving the efficiency and performance of wireless communication networks.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
