Trigger Frame SU PPDU Transmission and AP Doze State Control
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Solution Overview
Problem
In next-generation wireless LAN systems, such as IEEE 802.11be or EHT, there is a need for improved signaling techniques to effectively utilize increased spatial streams, particularly in transmitting Single User (SU) PPDU during Transmission Opportunity (TXOP) periods allocated by trigger frames, while ensuring power saving for Access Points (APs) not involved in transmission.
Innovation Solution
The method involves a STA receiving a MU-RTS frame from an AP, transmitting a CTS frame with type information indicating whether the SU PPDU is transmitted to the AP or a peer STA, allowing the AP to enter a doze state for power saving, and enabling efficient TXOP sharing for SU PPDU transmission to a peer STA within the allocated TXOP period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AP remains in awake state to receive SU PPDU transmissions, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The AP dynamically transitions between awake and doze states based on the transmission type indicated in the CTS frame. When type information indicates transmission to peer STA, the AP enters doze state; when indicating transmission to AP, the AP remains awake. This dynamic state adjustment resolves the contradiction between reliability and power consumption.
Solution Approach 2:
The CTS frame includes type information that provides feedback to the AP about the intended transmission target. This feedback mechanism allows the AP to make informed decisions about maintaining awake state or transitioning to doze state, thereby balancing reliability requirements with power consumption optimization.
2Use of energy by stationary object
If the AP enters doze state quickly for power saving, then power consumption is reduced, but transmission coordination complexity increases
Solution Approach 1:
The transmission type is determined and indicated in the CTS frame before the actual SU PPDU transmission begins. This preliminary indication allows the AP to proactively transition to doze state when appropriate, avoiding the need for complex real-time coordination during transmission and simplifying the overall system operation.
3Productivity
If TXOP is allocated for SU PPDU transmission to peer STA, then transmission efficiency is improved, but AP power management complexity increases
Solution Approach 1:
The type information field in the CTS frame serves as an intermediary mechanism that conveys transmission intent from the transmitting STA to the AP. This simple binary indicator enables efficient peer-to-peer transmission coordination while keeping AP power management logic straightforward, resolving the contradiction between transmission efficiency and power management complexity.
Data Source
AI summary
Proposed are a method and apparatus for transmitting a SU PPDU to a peer STA in a TXOP period allocated by a trigger frame in a wireless LAN system. Specifically, a first STA receives an MU-RTS frame from an AP. The first STA transmits a CTS frame to the AP. The first STA transmits a first SU PPDU to the AP or a second STA. The MU-RTS frame includes information about a TXOP period in which the first SU PPDU may be transmitted. The CTS frame includes type information. The AP is set to a doze state after the CTS frame is received.