Channel Sharing Method Using Time Slot Permutations to Prevent Signal Collisions
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Solution Overview
Problem
Existing channel sharing methods in wireless communication systems often result in signal collisions and prolonged delays, especially when multiple devices operate simultaneously, leading to invalid signals in some channels, particularly in one-way wireless control scenarios.
Innovation Solution
The method involves arranging channels with specific time intervals and slots, where each channel is constructed using permutations of repeat times, ensuring that at least one signal is not collided with others in the worst delay time, and allowing for pre-estimation of this delay. This is achieved by setting a time slot width that is X times the maximum time interval, with X being a positive number, and using permutations of repeat times that are M times the width of the time slot, where M is an integer greater than 0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple channels transmit signals simultaneously in one-way wireless control, then channel utilization increases, but signal collisions occur and some channels cannot receive signals for long periods
Solution Approach 1:
The transmission time is segmented into distinct time slots for each channel. Each channel is assigned specific time slots where it can transmit or receive signals without collision. This temporal segmentation ensures that when one channel transmits, other channels can still receive their assigned signals, thereby maintaining both high channel utilization and reliable signal reception.
Solution Approach 2:
Each channel operates in periodic cycles with alternating transmit and receive time slots. The transmission pattern repeats periodically, allowing channels to switch between transmitting and receiving in a structured manner. This periodic action ensures that every channel gets guaranteed receive opportunities while maintaining continuous channel activity.
2Ease of operation
If signals are generated randomly in each channel, then transmission simplicity increases, but time delay cannot be estimated and some channels experience long periods without valid signals
Solution Approach 1:
The time slot assignments and transmission schedules are predetermined and configured before actual signal transmission begins. Each channel's transmit and receive time slots are pre-calculated and stored in lookup tables. This preliminary action eliminates the need for random signal generation during operation, providing both deterministic delay estimation and simplified real-time transmission control.
Solution Approach 2:
The system incorporates feedback mechanisms where receivers send acknowledgments to transmitters about successful signal reception. This feedback allows the system to adjust and optimize time slot assignments dynamically, ensuring that delay requirements are met while maintaining transmission simplicity through automated control.
3Device complexity
If channel bandwidth is restricted, then frequency management becomes simpler, but the number of available channels is insufficient
Solution Approach 1:
The system transitions from frequency-domain channel separation to time-domain channel separation. Instead of allocating different frequency bands to different channels (which limits the number of channels), the invention allocates different time slots to different channels within the same frequency band. This dimensional change from frequency to time allows many more channels to operate simultaneously without increasing frequency management complexity.
Data Source
AI summary
A channel sharing method and device thereof are disclosed. The method starts by providing a plurality of channels, wherein each of the channels comprises a time interval. A time slot having a width being X times of a maximum value of all the time intervals is provided, wherein C is a positive number. Each of the channels is generated by a permutation of at least one repeat time, which is M times of the width of the time slot, wherein M is an integer larger than 0. A first time slot of the repeat time comprises a signal. A maximum time span of the signals in each channel is the time interval of each channel. All the channels are arranged so that at least one of the signals in each channel is not collided with the signals of other channels in a worst time delay.