Information Transmission Device Multiplexing Channel Availability Data
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Solution Overview
Problem
Wireless devices face inefficiencies in performing preparatory operations in white spaces due to the time-consuming process of sensing available frequency bands, which are often wide and require extensive burden.
Innovation Solution
An information transmission device that multiplexes information about available channels in coarse and fine geographical divisions, transmitting the former at a frequency equal to or higher than the latter, allowing wireless devices to quickly identify available channels using simple processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless devices perform sensing to find available frequency bands, then they can identify usable channels, but the process requires an enormous amount of time due to the wide frequency band coverage needed
Solution Approach 1:
The patent segments the wide frequency band into multiple sub-bands and divides the area into first-type and second-type partial areas with different fineness levels. By transmitting channel availability information for each segment separately, the system enables wireless devices to quickly identify available channels without sensing the entire wide frequency band, thus reducing sensing time while maintaining detection accuracy.
2Loss of information
If an information transmission station transmits detailed channel availability information for all partial areas, then wireless devices can obtain comprehensive channel data, but the amount of information becomes very large
Solution Approach 1:
The patent applies local quality by transmitting channel availability information with different levels of detail for different types of partial areas. First-type partial areas use coarse division with less detailed information, while second-type partial areas use fine division with more detailed information. This allows the system to provide comprehensive channel data where needed while reducing overall information volume by not transmitting uniformly detailed information across all areas.
3Speed
If the information transmission station transmits information at high frequency, then wireless devices can quickly update channel availability, but the transmission burden and energy consumption increase
Solution Approach 1:
The patent implements dynamic transmission frequency adjustment based on the type of partial area. First-type partial areas (coarse division) transmit information at higher frequencies for faster updates, while second-type partial areas (fine division) transmit at lower frequencies to reduce energy consumption. This dynamic approach allows the system to optimize the balance between update speed and energy usage depending on the specific area and information criticality.
Data Source
AI summary
Provided are an information transmission device and method thereof allowing a wireless device intended to newly start an operation in a white space to efficiently perform its preparatory operation, the transmission device including: a first retainer retaining first information including at least a list of channels available in each of first-type partial areas obtained when dividing an area at a first fineness; a second retainer retaining second information including at least a list of channels available in each of second-type partial areas obtained when dividing the area at a second fineness finer than the first fineness; a generator generating multiplexed information including the first and the second information so that the first and the second information are repeated at equal frequencies, or the first information is repeated at a frequency higher than that of the second information in the time axis direction; and a transmitter wirelessly transmitting the multiplexed information.