Cellular Base Station Unlicensed Band Channel Contention
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Solution Overview
Problem
Communication technologies originally designed for licensed bands face interference challenges when used in unlicensed bands, affecting the transmission of existing WLAN systems, and there is a need for methods to perform data communication in unlicensed bands without such interference.
Innovation Solution
A method and apparatus for performing communication in unlicensed bands by using channel contention to occupy channels, transmitting messages about usable time periods, and switching between different communication schemes to minimize interference, allowing cellular communication in unlicensed bands while reducing frequency usage costs and increasing data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cellular communication is used in unlicensed bands, then frequency usage costs are reduced and data throughput is increased, but interference with WLAN systems occurs
Solution Approach 1:
The base station performs channel sensing before transmitting cellular signals in unlicensed bands. By detecting whether the channel is idle or occupied by WLAN traffic beforehand, the system can determine appropriate transmission timing and power levels, thereby reducing interference while maintaining high data throughput
Solution Approach 2:
The system dynamically adjusts transmission parameters based on real-time channel conditions. When WLAN traffic is detected, cellular transmission is postponed or power is reduced; when channel is idle, full-power transmission occurs. This dynamic adaptation resolves the contradiction between maximizing throughput and minimizing interference
2Ease of operation
If cellular communication uses unlicensed bands without channel sensing, then transmission simplicity is maintained, but interference control deteriorates
Solution Approach 1:
A channel sensing mechanism acts as an intermediary between the cellular transmission system and the unlicensed band environment. This intermediary layer monitors WLAN activity and mediates transmission decisions, providing simple automated control that maintains ease of operation while improving interference control
3Productivity
If cellular base station transmits in unlicensed bands simultaneously with WLAN, then resource utilization is maximized, but collision probability increases
Solution Approach 1:
The base station performs periodic channel sensing at defined intervals before and during transmission opportunities. This periodic monitoring allows the system to capture available unlicensed band resources while detecting WLAN activity patterns, thereby maximizing resource utilization while maintaining low collision probability through rhythmically spaced transmission attempts
Data Source
Figure 1~2b
Figure 3a~3b
Figure 3c~3d
AI summary
A method for performing communication by a cellular base station in a wireless communication system is provided. The method includes performing channel contention for occupying a channel of an unlicensed band, if the channel of the unlicensed band is occupied, the cellular base station transmits a first message including information about a time period in which the channel of the unlicensed band is usable, to at least one first User Equipment (UE) that performs communication in the channel of the unlicensed band using a first communication scheme, and communicating with a second UE using a second communication scheme different from the first communication scheme in the channel of the unlicensed band during a time period corresponding to the time period information. The second communication scheme corresponds to a cellular communication scheme, and the first message is transmitted to the at least one first UE based on the first communication scheme.