Uplink Multi-User Transmission Carrier Sensing Control
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink/downlink multi-user data due to synchronization issues and overlapping frequency resources, leading to reduced throughput and increased power control complexities in dense user environments.
Innovation Solution
A method for uplink multi-user (UL MU) transmission in wireless communication systems, where a station (STA) performs carrier sensing and receives a trigger frame with a carrier sense indicator, allowing the STA to transmit UL MU frames based on the channel state, either reflecting or ignoring the result of carrier sensing, to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier sensing results are reflected for all UL MU transmissions, then transmission reliability is improved, but device complexity and processing load increase
Solution Approach 1:
The patent implements dynamic carrier sensing indication where the AP sends a trigger frame with a carrier sensing indication field that dynamically specifies whether STAs should reflect carrier sensing results for upcoming UL MU transmissions. This allows the system to adapt between requiring carrier sensing (for reliability) and ignoring it (for reduced complexity) based on current channel conditions and traffic requirements, resolving the contradiction by making the carrier sensing requirement flexible rather than fixed
2Reliability
If carrier sensing is performed and reflected, then channel access reliability improves, but transmission speed and efficiency decrease
Solution Approach 1:
The patent employs periodic trigger frames from the AP that carry carrier sensing indication information, allowing STAs to periodically adjust their carrier sensing behavior. During periods when the AP indicates carrier sensing should be ignored, transmission speed increases due to reduced processing overhead. When reliability is needed, the AP triggers carrier sensing reflection. This periodic control mechanism balances reliability requirements with transmission efficiency demands
3Measurement precision
If carrier sensing results are always reflected, then transmission accuracy improves, but adaptability to different transmission scenarios decreases
Solution Approach 1:
The patent changes the parameter of carrier sensing indication from a fixed always-reflect mode to a dynamically controllable parameter through the trigger frame's carrier sensing indication field. This allows the system to adjust the carrier sensing reflection behavior as a controllable parameter, enabling adaptation to different transmission scenarios such as high-mobity environments, dense user scenarios, and varying traffic types, thereby resolving the contradiction between measurement precision and adaptability
Data Source
AI summary
A method for performing, by a station (STA) apparatus, uplink (UL) multi-user (MU) transmission in a wireless communication system according to an embodiment of the present invention includes performing carrier sensing on a channel, receiving a trigger frame including information for UL MU transmission and a carrier sense indicator indicating whether a result of the carrier sensing is to be reflected from an access point (AP), and transmitting an UL MU frame through the channel based on the information for UL MU transmission. The UL MU frame is transmitted through the channel based on a result of the carrier sensing if the carrier sense indicator indicates the reflection of a result of the carrier sensing. The UL MU frame is transmitted through the channel regardless of a result of the carries sensing if the carrier sense indicator does not indicate the reflection of a result of the carrier sensing.