Wireless Repeater Standby Timing for Overlapping Channels
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Solution Overview
Problem
Conventional wireless communication repeaters face issues with signal collisions and transmission failures due to interference and congestion, particularly when using overlapping or adjacent frequency channels, leading to degraded communication quality and limited communication capacity.
Innovation Solution
A wireless communication device and system that includes multiple communication modules with a control circuit to set unique standby times and rules for each group, ensuring they do not start transmission simultaneously by using different random backoff value populations, AIFSN values, or preferential treatment settings to avoid signal collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple wireless communication modules use overlapping or adjacent frequency channels to expand communication area, then communication coverage is improved, but signal collision and interference occur leading to transmission failure
Solution Approach 1:
The system performs preliminary carrier sensing before transmission to detect channel status. Modules sense the channel and determine if it is idle or busy before attempting transmission, preventing simultaneous transmission collisions by acting in advance based on detected channel conditions
Solution Approach 2:
The standby time for each wireless communication module is dynamically set based on channel sensing results and random backoff calculations. This dynamic adjustment allows modules to adapt their transmission timing according to real-time channel conditions, reducing collisions while maintaining communication coverage
2Object-affected harmful factors
If carrier sensing is performed before transmission in the same frequency band, then interference between simultaneous transmissions is reduced, but signal collision still occurs due to power leaking from adjacent channels
Solution Approach 1:
The system changes the standby time parameter for each wireless communication module based on carrier sensing results and random backoff calculations. By varying this temporal parameter, the system ensures that even when using overlapping or adjacent frequency channels, modules do not transmit simultaneously, thereby preventing signal collision despite power leaking between channels
3Device complexity
If the same random backoff counting range is used by multiple modules, then simplicity is maintained, but transmission start timing overlaps causing signal collision
Solution Approach 1:
Each wireless communication module is assigned a unique local quality in terms of standby time calculation. While using the same random backoff counting range for simplicity, each module adds its unique identifier to the calculation, creating distinct standby times that prevent transmission start timing overlap without increasing overall system complexity
Data Source
AI summary
The wireless communication device includes a plurality of wireless communication modules that uses channels interfering with each other. A repeater includes a control circuit that issues a command of a rule of a standby time to the wireless communication modules. The wireless communication modules belong to different communication groups, respectively, and perform communication processing for wirelessly communicating with a master device and a slave device, respectively, thereby relaying a packet therebetween. The communication processing includes processing of starting transmission of a packet in a case where, after an idle state is detected by carrier sensing, the idle state is maintained when the standby time elapses and processing of setting the standby time in accordance with the rule. A different rule is issued as a command to each of the plurality of wireless communication modules.