P2P Transmission in WLAN Systems
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face inefficiencies in peer-to-peer (P2P) communication due to power loss and delayed data transmission, particularly in environments where direct data exchange between stations (STAs) is not effectively managed.
Innovation Solution
A method for P2P transmission in WLAN systems that includes transmitting a P2P transmission request frame to an access point (AP), receiving a response frame, and utilizing a trigger frame to manage power save modes and optimize data transmission between STAs, enabling both P2P and uplink transmissions with reduced power consumption and lower latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If STAs transmit data through AP in traditional WLAN, then connection reliability is maintained, but transmission delay increases and power consumption increases
Solution Approach 1:
The patent extracts the data transmission function from the AP by enabling direct P2P communication between STAs. The AP is removed from the transmission path for P2P data, allowing STAs to communicate directly without routing through the AP, thereby reducing transmission delay and power consumption while maintaining connection reliability through direct peer-to-peer links
2Productivity
If STAs continuously monitor for transmission opportunities, then transmission efficiency is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the AP send trigger frames in advance that contain pre-configured transmission parameters and timing information. This allows STAs to prepare for transmission without continuously monitoring, reducing power consumption while maintaining transmission efficiency through the advance scheduling of transmission opportunities
Solution Approach 2:
The patent implements feedback mechanisms where STAs send acknowledgment frames and the AP sends trigger frames based on received information. This feedback loop allows the system to optimize transmission opportunities dynamically, improving transmission efficiency while STAs can enter power save mode during periods without expected transmission opportunities
3Loss of time
If AP manages all transmissions centrally, then control reliability is maintained, but transmission latency increases
Solution Approach 1:
The patent segments the transmission control function by allowing STAs to autonomously manage P2P transmissions based on trigger frames received from the AP. The centralized control is segmented into distributed decision-making at the STA level for P2P communications, reducing latency by eliminating the need for continuous AP intervention while maintaining overall system coordination
Data Source
AI summary
In a wireless local area network (LAN) system, a transmitting station (STA) may transmit a peer-to-peer (P2P) transmission request frame to an access point (AP). The transmitting STA may receive a P2P transmission response frame from the AP. The transmitting STA may receive a trigger frame from the AP. The trigger frame may include information related to whether same is for an uplink, P2P transmission or both an uplink and P2P transmission. The transmitting STA may transmit data to a receiving STA. The transmitting STA and the receiving STA may be non-AP STAs. The transmitting STA may transmit a null data packet announcement (NDPA) frame and a null data packet (NDP) frame to the receiving STA. The transmitting STA may receive, from the receiving STA, a feedback frame including state information for the channel between the transmitting STA and the receiving STA.