Multi-User PHY Packet Sensing With Empty Data Stream Isolation
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Solution Overview
Problem
Existing multi-user physical layer packets in wireless local area networks (WLAN) sensing suffer from unsatisfactory performance and interference issues, particularly when spatially multiplexing sensing and non-sensing devices, leading to reduced throughput and sensing accuracy.
Innovation Solution
A method and apparatus for transmitting multi-user physical layer packets with a data field left empty for sensing devices, controlling emission patterns to ensure low interference, and employing interference suppression for non-sensing devices, while using distinct transmitter configurations for each stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing is used to transmit data to both sensing and non-sensing devices simultaneously, then resource utilization and throughput are improved, but interference between the two types of devices increases and sensing performance degrades
Solution Approach 1:
The patent segments the multi-user PPDU by leaving the data field empty for sensing devices while maintaining data transmission for non-sensing devices. This segmentation allows each device type to receive appropriate information without mutual interference, resolving the contradiction between maintaining high throughput for non-sensing devices and preserving sensing performance for sensing devices.
Solution Approach 2:
The patent applies local quality by configuring different transmission parameters for different spatial streams within the same PPDU. Specifically, the spatial emission pattern is optimized locally for non-sensing devices while ensuring that the empty data field for sensing devices does not create interference, thus allowing each device type to operate in its optimal quality zone without affecting the other.
2Productivity
If data is transmitted to non-sensing devices in a multi-user PPDU, then throughput for non-sensing devices is improved, but interference to sensing devices performing channel estimation increases
Solution Approach 1:
The patent extracts the data field for sensing devices from the multi-user PPDU by leaving it empty. This extraction removes the source of interference that would otherwise contaminate channel estimation measurements at sensing devices, while still allowing data to be transmitted to non-sensing devices in their allocated streams, thus resolving the contradiction between throughput and measurement precision.
Solution Approach 2:
The patent applies preliminary anti-action by proactively leaving the data field empty for sensing devices before transmission occurs. This preventive measure eliminates potential interference at the source, ensuring that channel estimation measurements remain accurate without requiring complex interference cancellation techniques, thus maintaining both throughput and sensing accuracy.
3Measurement precision
If the data field is left empty for sensing devices, then sensing performance is maintained, but resource utilization and throughput decrease
Solution Approach 1:
The patent merges the transmission opportunities for sensing and non-sensing devices into a single multi-user PPDU. By leaving the data field empty for sensing devices while transmitting data to non-sensing devices in the same transmission frame, the system combines the benefits of both sensing operations and data communication, thus maintaining sensing performance while improving overall resource utilization and throughput compared to separate transmissions.
Solution Approach 2:
The patent makes the multi-user PPDU universal by enabling it to serve dual purposes: maintaining sensing performance for sensing devices and providing data transmission for non-sensing devices simultaneously. This multi-functionality allows a single transmission mechanism to fulfill both sensing and communication requirements, eliminating the need for separate dedicated transmissions and thereby improving overall system throughput.
Data Source
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AI summary
A method is disclosed of a transmitter configured to transmit more than one spatially multiplexed streams comprising a multi-user physical layer packet for a plurality of users. The plurality of users comprises a first type user and a second type user. A first stream is assigned for the first type user and a second stream is assigned for the second type user. The method comprises leaving a data field of the physical layer packet empty for the first type user, providing second type user emission strength (in a spatial direction towards the first type user) that falls below a threshold value by controlling a spatial emission pattern associated with the second type user for the physical layer packet, and transmitting the physical layer packet. In some embodiments, the method further comprises transmitting an announcement indicative of that the data field of the physical layer packet is empty for the first stream. Corresponding methods of receivers for first and second type users, apparatuses, wireless communication devices, and computer program product are also disclosed.