Cellular Device Managing Shared Frequency Band Interference
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Solution Overview
Problem
The existing technologies for wireless communication in cellular systems do not effectively utilize frequency bands shared with wireless LAN standards, leading to inefficient use and hidden terminal problems due to the application of CSMA/CA mechanisms in cellular systems with multiple terminal devices.
Innovation Solution
A device with an acquisition unit to identify terminal devices suitable for cellular communication using a shared frequency band and a control unit to notify these devices, allowing for appropriate use of the band by performing control operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSMA/CA mechanism is applied to cellular system for frequency band sharing with wireless LAN, then frequency band utilization is enabled, but hidden terminal problem occurs and communication reliability deteriorates
Solution Approach 1:
The patent segments the frequency band usage into dedicated cellular communication slots and shared wireless LAN slots within a frame structure. This segmentation allows the cellular system to reserve specific time periods for reliable cellular communication while sharing other periods with wireless LAN devices, thereby preventing hidden terminal problems while maintaining frequency band utilization flexibility.
Solution Approach 2:
The base station performs preliminary actions by notifying terminal devices of their candidacy status before actual communication begins. The system pre-establishes frame structures and time slots in advance, allowing terminal devices to prepare for cellular communication using shared frequency bands without causing interference to wireless LAN devices, thus ensuring communication reliability.
2Productivity
If frequency band is shared between cellular system and wireless LAN, then frequency efficiency is improved, but interference with wireless LAN communication increases
Solution Approach 1:
The patent implements periodic action through a frame structure that alternates between cellular communication periods and wireless LAN periods. The base station periodically switches between serving cellular terminal devices and wireless LAN devices in a cyclic manner, allowing frequency band sharing that improves overall efficiency while preventing continuous interference with wireless LAN communications through structured periodic allocation.
Solution Approach 2:
The base station acts as an intermediary between cellular terminal devices and wireless LAN devices sharing the frequency band. It mediates the coexistence by managing transmission rights, notifying device candidacy status, and controlling access to the shared frequency band, thereby enabling frequency efficiency improvement while minimizing harmful interference to wireless LAN communications.
3Productivity
If multiple terminal devices use shared frequency band simultaneously, then system throughput increases, but collision probability increases
Solution Approach 1:
The patent segments the time domain within the frequency band by introducing frame structures with specific time slots for different terminal devices. This temporal segmentation allows multiple terminal devices to use the shared frequency band simultaneously without collision, as each device is assigned a dedicated time slot within the frame, thereby maintaining high system throughput while ensuring reliable communication.
Data Source
AI summary
[Object] To enable a frequency band shared between wireless communication of a cellular system and wireless communication conforming to a wireless LAN standard to be more appropriately used in the cellular system.[Solution] There is provided a device including an acquisition unit configured to acquire information indicating a terminal device which is a device candidate for performing wireless communication of a cellular system using a frequency band shared between the wireless communication of the cellular system and wireless communication conforming to a wireless local area network (LAN) standard, and a control unit configured to notify the terminal device that the terminal device is the device candidate.