Radio Master Unit OFDMA Control for Slave Collision
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems between a radio master unit and multiple radio slave units using OFDM modulation schemes experience prolonged communication completion times and data transmission delays due to signal collisions when a predetermined number or more of radio slave units are connected, as they cannot select between OFDM and OFDMA schemes effectively.
Innovation Solution
A radio master unit with an OFDMA preferential setting unit, connected-slave-unit detection unit, and OFDMA control unit that selects the OFDMA scheme based on user input and detects the number of connected radio slave units, averaging data transmission and reception to reduce delays and shorten communication completion times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OFDM modulation scheme is used for communication between radio master unit and radio slave units, then the system can maintain compatibility with existing communication protocols, but the communication completion time becomes longer and data transmission delays occur due to signal collisions when multiple slave units are connected
Solution Approach 1:
The patent changes the communication scheme parameter from OFDM to OFDMA when a predetermined number or more of radio slave units are connected. The master unit detects the number of connected slave units and switches to OFDMA scheme, which divides the frequency band into multiple resource blocks and allocates them to different slave units, thereby preventing signal collisions and reducing communication completion time.
2Adaptability or versatility
If multiple radio slave units are connected to the radio master unit, then the system can support more devices for communication, but signal collisions occur between transmission signals from slave units causing data transmission delays
Solution Approach 1:
The patent segments the frequency band into multiple orthogonal resource blocks and assigns different resource blocks to different radio slave units for simultaneous transmission. This segmentation prevents signal collisions by ensuring that each slave unit transmits on a dedicated frequency resource, thereby maintaining reliable data transmission even when multiple slave units are connected.
3Adaptability or versatility
If the system supports both OFDM and OFDMA schemes, then the system can adapt to different communication scenarios, but the device complexity increases due to the need to select and manage multiple communication schemes
Solution Approach 1:
The patent implements a dynamic communication scheme selection mechanism where the master unit automatically detects the number of connected slave units and switches between OFDM and OFDMA schemes based on the detected quantity. When the number of slave units is below a threshold, OFDM is used; when the threshold is exceeded, OFDMA is activated. This dynamic adaptation reduces device complexity by providing clear switching criteria while maintaining versatility.
Data Source
AI summary
In a radio master unit of the present disclosure, a OFDMA preferential setting unit preferentially selects, based on user input information, the OFDMA scheme as a communication scheme for performing communication with a plurality of radio slave units connected to the master unit. When the setting to preferentially select the OFDMA scheme is made, a connected-slave-unit detection unit detects the number of the radio slave units to be communicated among a plurality of the radio slave units connected to the master unit. When the number of the radio slave units to be communicated with is larger than a predetermined number, a OFDMA control unit averages the volume of data to be transmitted and received to and from the radio slave units to be communicated with among the radio slave units to be communicated with, and executes control of OFDMA communication with the radio slave units to be communicated with.