Uplink Beamforming Matrix Preparation in WLAN PPDU
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Solution Overview
Problem
Next-generation WLAN systems require significant signaling and resources for uplink beamforming, leading to increased complexity and overhead, which hampers data throughput and efficiency.
Innovation Solution
The method involves a first device receiving a physical layer protocol data unit (PPDU) with a trigger frame, preparing an uplink beamforming matrix based on specific sub-fields within the PPDU, and transmitting a beamformed signal to a second device, thereby reducing the need for channel sounding processes and minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink beamforming is implemented in next-generation WLAN systems, then communication efficiency and data throughput are improved, but signaling overhead and system complexity increase significantly
Solution Approach 1:
The patent applies preliminary action by having the first device prepare the uplink beamforming matrix in advance based on the first sub-field value received in the PPDU preamble, before actually transmitting the beamformed signal. This pre-preparation reduces the processing complexity during the actual beamforming operation and minimizes the signaling required at transmission time, thus improving data throughput while managing signaling overhead.
Solution Approach 2:
The patent utilizes parameter changes by interpreting different values of the first sub-field in the PPDU preamble to determine whether to prepare an uplink beamforming matrix. This parameter-based control mechanism allows the system to dynamically adjust beamforming operations based on channel conditions and traffic requirements, optimizing data throughput while reducing unnecessary signaling overhead when beamforming is not required.
2Measurement precision
If channel sounding processes are performed for uplink beamforming, then beamforming accuracy is improved, but resources and time consumption increase
Solution Approach 1:
The patent extracts the essential beamforming information directly from the PPDU preamble (first sub-field) without requiring separate channel sounding processes. By taking out the necessary beamforming parameters from the existing data transmission structure, the system achieves adequate beamforming accuracy while eliminating the time-consuming channel sounding procedures, thus reducing time consumption without significantly compromising beamforming performance.
Solution Approach 2:
The patent applies partial action by performing beamforming matrix preparation only when the first sub-field indicates it is necessary, rather than always performing full channel sounding. This selective approach provides sufficient beamforming accuracy for most scenarios while avoiding the excessive time consumption of complete channel sounding processes in every transmission.
Data Source
AI summary
An operating method of a first device communicating with a second device in a wireless local area network (WLAN), includes: receiving, from the second device, a physical layer protocol data unit (PPDU) including a payload that includes a trigger frame; preparing an uplink beamforming matrix based on a value of an uplink beamforming-related first sub-field included in a preamble of the PPDU; beamforming, according to the uplink beamforming matrix, the PPDU; and transmitting the beamformed PPDU to the second device based on a value of an uplink beamforming-related second sub-field included in the trigger frame.