Wireless Communication System Delay-Based Frequency Switching
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Solution Overview
Problem
In wireless communication systems, low transmission rate terminals with poor communication status can prolong channel occupancy time, leading to decreased communication speed for all terminals, including high transmission rate ones, and can cause disconnection issues.
Innovation Solution
A wireless communication system that includes wireless terminals capable of communicating using both a low frequency band and a high frequency band, and a multi-device compatible base station with a delay determination unit and a control unit. The system determines if communication delays exceed a threshold and switches to using only the low frequency band until a predetermined time has passed, preventing high frequency band communication speed decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low transmission rate terminal with poor communication status uses the high frequency band, then the terminal can establish communication, but the channel occupancy time becomes long and the communication speed of the entire system decreases
Solution Approach 1:
The system dynamically switches communication schemes based on terminal status. When a terminal exhibits poor communication status (low transmission rate, long channel occupancy), the base station automatically switches that terminal to the first communication scheme (low frequency band) while maintaining the second communication scheme (high frequency band) for other terminals. This dynamic adaptation resolves the contradiction by allowing poor-status terminals to communicate reliably via low frequency without degrading high frequency band performance.
Solution Approach 2:
The system segments terminals into different communication groups based on their status. Terminals with poor communication status are separated into the first communication scheme (low frequency band), while terminals with good status continue using the second communication scheme (high frequency band). This segmentation prevents poor-status terminals from occupying high frequency band resources and reducing overall system communication speed.
2Duration of action of stationary object
If a low transmission rate terminal occupies the channel for a long time, then the terminal maintains communication continuity, but the communication speed of high transmission rate terminals decreases
Solution Approach 1:
The base station dynamically monitors channel occupancy time and transmission rates. When a terminal's channel occupancy exceeds a threshold or transmission rate is low, the system dynamically switches that terminal to the first communication scheme. This dynamic response limits the duration of high channel occupancy by poor-status terminals in the high frequency band, thereby protecting the communication speed of high transmission rate terminals.
Solution Approach 2:
The first communication scheme (low frequency band) acts as an intermediary for terminals with poor communication status. These terminals use the low frequency band as a separate communication path, preventing them from continuously occupying the high frequency band channel. This intermediary channel resolves the conflict between maintaining communication for poor-status terminals and preserving high communication speeds for other terminals.
3Productivity
If the system uses the high frequency band for communication, then the communication capacity increases, but terminals with poor communication status cause system-wide speed degradation
Solution Approach 1:
The system segments the communication bandwidth into two frequency bands with different characteristics. The high frequency band (second communication scheme) provides high communication capacity for terminals with good status, while the low frequency band (first communication scheme) provides stable, reliable communication for terminals with poor status. This segmentation ensures that poor-status terminals do not degrade the performance and stability of the high frequency band system.
Solution Approach 2:
The system changes the frequency band parameter based on terminal performance. Terminals experiencing poor communication status (low transmission rate, high delay) have their operating frequency changed from the high frequency band to the low frequency band. This parameter change allows the system to maintain high communication capacity in the high frequency band while ensuring reliable communication for all terminals through adaptive frequency selection.
Data Source
AI summary
A wireless communication system according to one embodiment is a wireless communication system including: one or more wireless terminals capable of communicating by both a first communication scheme using a first frequency band and a second communication scheme using a second frequency band, which is higher than the first frequency band; and a multi-device compatible base station that accommodates the wireless terminals, and the wireless communication system includes: delay determination circuitry configured to determine whether a delay in communication of the second communication scheme exceeds a predetermined value; and a controller to perform control such that the wireless terminals and the base station communicate by the first communication scheme without using the second communication scheme until a predetermined time elapses in a case where the delay determination circuitry determine that the delay exceeds the predetermined value.