Dual-Band Access Point Control for Wireless Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems using the ISM band face significant path loss and signal blockage issues, leading to inefficient transmission of control messages and reduced coverage, especially for distant or obstructed mobile stations, and supporting multiple channels further reduces transmission efficiency.
Innovation Solution
The system employs a dual-band approach, using the VHF/UHF TV band for control messages and the ISM band for data messages, with adaptive modulation and coding, and switches to the ISM band when an incumbent user is detected in the VHF/UHF TV band, ensuring stable communication by utilizing unused frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control messages are transmitted using the lowest level of MCS to ensure reliability, then transmission reliability is improved, but channel occupancy time significantly increases and transmission efficiency deteriorates
Solution Approach 1:
The patent segments the transmission process by using two different frequency bands: VHF/UHF TV band for control messages and ISM band for data messages. This segmentation allows control messages to be transmitted with robust modulation while data messages use higher efficiency modulation, resolving the contradiction between reliability and efficiency
Solution Approach 2:
The VHF/UHF TV band acts as an intermediary frequency band specifically for control message transmission. This intermediary band provides the reliability needed for control messages without affecting the efficiency of data transmission on the ISM band
2Area of stationary object
If multiple channels are supported for the ISM band to expand coverage, then coverage area is improved, but transmission efficiency is reduced due to duplicate control message transmission on each channel
Solution Approach 1:
The patent extracts the control message transmission function from the data transmission channels and places it on a separate VHF/UHF TV band. This extraction eliminates the need for duplicate control messages on each ISM band channel, maintaining transmission efficiency while supporting multiple channels for expanded coverage
3Area of stationary object
If the VHF/UHF TV band is used for control messages to improve coverage and reduce path loss, then coverage is improved, but channel occupancy time increases when incumbent users are present
Solution Approach 1:
The patent implements dynamic frequency band selection where the system can switch between VHF/UHF TV band and ISM band based on incumbent user presence. When incumbent users are detected, the system dynamically switches to ISM band, preventing excessive channel occupancy time while maintaining coverage benefits when VHF/UHF is available
Data Source
AI summary
An access point (AP) and a mobile station in a wireless communication system and a method of controlling the same are provided. A method of controlling an AP in a wireless communication system includes: determining whether a transmission of a control message is needed; transmitting the control message via a first frequency band when the transmission of the control message is needed; determining whether a transmission of a data message is needed; and transmitting the data message via a second frequency band when the transmission of the data message is needed.