Synchronous Independent Channel Access in Wireless Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring fair channel access and reducing inter-channel interference when using link aggregation, particularly affecting legacy devices in multi-band operations.
Innovation Solution
The implementation of synchronous independent channel access methods using enhanced back-off procedures and padding to synchronize data frame transmissions across multiple wireless bands, ensuring that legacy devices have equal opportunities for data transmission and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If early access is used on a second primary wireless channel without receiving a transmission opportunity, then the wireless station can transmit data faster on multiple bands, but inter-channel interference increases and legacy devices lose channel access opportunities
Solution Approach 1:
The wireless station performs carrier sensing and checks channel availability before initiating transmission on the second primary channel. By performing preliminary actions (sensing, validation) before early access, the system ensures that transmission only occurs when the channel is truly idle, preventing interference with legacy devices while maintaining the speed benefits of early access
Solution Approach 2:
The system continuously monitors channel status through carrier sensing and adjusts transmission timing based on real-time feedback from the wireless environment. This feedback mechanism allows the station to detect when legacy devices are present and defer transmission, dynamically balancing between fast multi-band transmission and interference prevention
2Adaptability or versatility
If independent EDCA back-off procedures are used on each primary channel, then each channel can be accessed independently, but channel access fairness deteriorates and legacy STAs cannot transmit using link aggregation
Solution Approach 1:
The patent merges the back-off procedures across multiple primary channels by having the EDCA function perform coordinated back-off on all channels simultaneously. This combining approach ensures that all STAs (including legacy ones) contend for channel access on an equal footing, while still allowing independent transmission opportunities on each channel when conditions permit
Solution Approach 2:
The EDCA back-off mechanism is designed to serve multiple functions: it provides independent channel access control for modern multi-band STAs while simultaneously ensuring fair access for legacy single-band STAs. This universal approach allows the same back-off procedure to benefit both EHT and legacy devices in the mixed network environment
3Productivity
If data frames are transmitted simultaneously on multiple primary channels without synchronization, then transmission throughput increases, but timing misalignment causes interference and reduces reliability
Solution Approach 1:
Before transmitting data frames on multiple primary channels, the wireless station performs preliminary carrier sensing and validates channel availability on each channel. This preliminary action ensures that simultaneous transmissions are coordinated and do not interfere with each other or with legacy devices, maintaining both high throughput and transmission reliability
Solution Approach 2:
The system uses continuous carrier sensing feedback to monitor the wireless medium on all primary channels and adjusts transmission timing dynamically. This feedback mechanism ensures that data frames are transmitted simultaneously only when all channels are confirmed idle, preventing interference while maximizing the throughput benefits of multi-channel transmission
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the present invention provide systems and methods for synchronous independent channel access in a wireless network. The synchronous independent channel access can be performed by a wireless station having multiple transceivers for simultaneous communication over multiple wireless bands. A wireless station can connect wirelessly to a wireless access point to access a first primary wireless band during a transmission opportunity, and can use early access on a second primary wireless band without receiving a transmission opportunity. The transmission and reception of data frames over the different primary channels are synchronized to prevent or mitigate inter-channel interference. According to some embodiments, the channels are synchronized using back-off procedures and/or padding to align the ending time of transmitted and received data frames, for example.