Enhanced PS-POLL Frame for Dual-Direction Data Transmission
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Solution Overview
Problem
In wireless local area networks, stations with high energy saving requirements face resource waste due to the need to re-contend for a channel after receiving downlink data, as standard power saving modes only allow for single data frame transmission in a transmission opportunity, limiting energy utilization.
Innovation Solution
The implementation of an enhanced power saving polling (PS-POLL) frame that includes indication information for the type of frame and a TXOP time limit, allowing stations to send both downlink and uplink data within a single transmission opportunity without re-contending for the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an STA uses standard power saving mode to sleep for one or more beacon intervals, then energy consumption is reduced, but the STA must re-contend for the channel after receiving downlink data, causing resource waste and increased latency
Solution Approach 1:
The STA sends the PS-POLL frame in advance to reserve a TXOP (Transmission Opportunity) time limit before actually transmitting data. This preliminary action secures channel access rights ahead of time, allowing the STA to receive downlink data and send uplink data within the reserved TXOP without re-contending for the channel, thus improving transmission efficiency while maintaining energy savings
Solution Approach 2:
The patent introduces a dynamic TXOP time limit parameter that can be adjusted based on the STA's energy saving requirements and data transmission needs. The TXOP duration is not fixed but can be dynamically set to accommodate different traffic patterns and energy constraints, allowing flexible optimization between energy consumption and transmission efficiency
2Device complexity
If an STA is limited to transmitting only one data frame per TXOP in standard power saving mode, then channel contention overhead is reduced, but the STA cannot send both downlink and uplink data within one TXOP, leading to resource waste
Solution Approach 1:
The patent merges downlink data reception and uplink data transmission into a single TXOP by allowing the STA to send a PS-POLL frame and subsequently receive downlink data and send uplink data within the same reserved time window. This combines multiple transmission operations that would otherwise require separate channel contending processes, eliminating re-contention time and improving overall transmission efficiency
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method, an access point, and a station. The method includes: sending an indication frame to an access point AP, where the indication frame includes first indication information and second indication information, the first indication information is used to indicate that a type of the indication frame is a PS-POLL frame, and the second indication information is used to indicate duration of the indication frame; and sending a data frame to the AP within the duration indicated by the second indication information. According to the embodiments of the present invention, an STA sends PS-POLL to an AP by using an indication frame and reserves channel duration, so that the STA does not need to contend for a channel again when the STA sends an uplink data frame to the AP after receiving a downlink data frame sent by the AP, which allows the STA to receive downlink data and send uplink data within one TXOP, thereby reducing resources consumed when the STA contends for a channel and improving an energy utilization rate of the STA.