PS-Poll Frame Duplication for WLAN Power Save Throughput
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Solution Overview
Problem
In wireless local area networks (WLANs), especially in power save mode, there is a need for an efficient method to transmit and receive frames across multiple channels, as existing technologies face challenges in optimizing data throughput and minimizing power consumption while ensuring reliable communication.
Innovation Solution
A method involving the transmission of a Power Save (PS) poll frame in a primary 20 MHz channel and duplicated PS poll frames in secondary 20 MHz channels, with specific scrambling sequences and bandwidth signaling, to request and receive bufferable frames from an access point, improving channel access and processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a station operates in power save mode in a multi-channel environment, then power consumption is reduced, but frame transmission efficiency and data throughput deteriorate due to lack of efficient channel signaling
Solution Approach 1:
The patent segments the frame transmission process into multiple independent PS-poll frames, each transmitted on a separate 20 MHz channel. This allows the station to efficiently manage power consumption by transmitting only necessary frames on specific channels while maintaining the ability to receive data across multiple channels, thus resolving the contradiction between power saving and transmission efficiency
Solution Approach 2:
The patent introduces a new dimension to frame transmission by enabling PS-poll frames to be transmitted on multiple simultaneous 20 MHz channels rather than a single channel. This multi-channel approach allows the station to maintain power save mode while improving frame transmission efficiency through parallel communication across different frequency dimensions
2Productivity
If duplicated PS poll frames are transmitted on multiple channels, then channel access and data reception are improved, but frame transmission time increases
Solution Approach 1:
The station transmits PS-poll frames on multiple channels in advance before the actual data transmission begins. This preliminary action on multiple channels simultaneously prepares the communication path and signals the access point to ready data for reception on the appropriate channels, improving overall channel access efficiency while the time cost is offset by parallel processing
Solution Approach 2:
By transmitting PS-poll frames on multiple channels simultaneously, the patent maintains continuous useful action across different frequency channels rather than sequential transmission. This parallel approach ensures that channel access is continuously available and data can be received as soon as the polling is complete, minimizing idle time and improving overall productivity
Data Source
AI summary
A method for a wireless local area network, the method performed by a station includes receiving a beacon frame from an access point (AP), the beacon frame including a Traffic Indication Map (TIM) element indicating that the AP has a buffered frame for the station; transmitting a power save (PS)-poll frame and at least one duplicated PS-poll frame to the AP on a first 20 MHz channel and at least one second 20 MHz channel, the PS poll frame being transmitted on the first 20 MHz channel, the at least one duplicated PS poll frame being transmitted on the at least one second 20 MHz channel; and receiving the buffered frame from the AP as a response of at least one of the PS poll frame and the at least one duplicated PS poll frame.