WUR Frame MAC Header Length Indication for WLAN Efficiency
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Solution Overview
Problem
Current WLAN systems face inefficiencies in accurately and efficiently transmitting or receiving Wake-Up Radio (WUR) frames, particularly due to challenges in indicating the frame length, which affects the decoding and processing of WUR frames by stations.
Innovation Solution
The method involves generating and transmitting WUR frames with a Media Access Control (MAC) header that includes frame length information, transmitter ID, and receiver ID, where the frame length information indicates the length of MAC content after the WUR preamble, excluding the MAC header length, to enable precise frame length indication and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frame length information is indicated in the WUR frame, then decoding accuracy is improved, but frame structure complexity increases
Solution Approach 1:
The patent combines the frame length indication function with the existing MAC header structure by utilizing the Duration/ID field, which traditionally serves other purposes. This merging approach allows frame length information to be conveyed without adding separate dedicated fields, thereby improving measurement precision while minimizing increases in frame structure complexity.
Solution Approach 2:
The MAC header fields, particularly the Duration/ID field, are designed to serve multiple functions: traditional frame control purposes and frame length indication for WUR frames. This multi-functionality allows the same structural elements to provide both historical compatibility and new length indication capabilities, resolving the contradiction between accuracy improvement and complexity increase.
2Use of energy by moving object
If WUR frame transmission is implemented, then power saving is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent segments the wireless communication system into two distinct radio components: a low-power WUR radio for wake-up signaling and a main PCR radio for full-duplex data transmission. This segmentation allows the station to maintain the WUR radio in a low-power state while using the PCR radio efficiently for actual data communication, thereby improving power saving without significantly compromising transmission efficiency.
Solution Approach 2:
The WUR frame transmission operates periodically or event-driven rather than continuously, allowing the main radio to remain in sleep mode during idle periods. This periodic activation improves power consumption while maintaining transmission efficiency by ensuring the main radio is ready when actually needed for data transfer.
Data Source
AI summary
A method for transmitting a wake-up radio (WUR) frame by an access point (AP) in a wireless LAN (WLAN) system according to one embodiment of the present invention comprises the steps of: generating a WUR frame including a WUR preamble and a MAC header; and transmitting the WUR frame, wherein the MAC header includes at least one of frame length information, a transmitter ID and a receiver ID, and when the frame length information is included in the MAC header, the frame length information indicates a length of MAC content located after the WUR preamble in the WUR frame, but the length of the MAC header may be excluded from the indicated length of the MAC content.