Terminal Relay for Unlicensed Channel Occupancy Sharing
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Solution Overview
Problem
In mobile communication systems, particularly in LTE systems, terminals operating on unlicensed frequency bands face challenges in acquiring and sharing channel occupancy information, leading to potential interference from neighboring Wi-Fi devices due to the 'hidden node' problem, as not all terminals can decode control information from the base station.
Innovation Solution
A method and apparatus for a terminal to receive control information from a base station using a first radio communication protocol, acquire channel occupancy information, and transmit this information to other terminals using a second radio communication protocol, enabling efficient sharing of unlicensed frequency channel occupancy details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LAA terminals use control information from base station for channel occupancy, then channel sharing efficiency is improved, but hidden node problem increases because WLAN terminals cannot decode the control information
Solution Approach 1:
The LAA terminal acts as an intermediary by receiving channel occupancy information from the base station and forwarding it to WLAN terminals. This mediator approach allows WLAN terminals to access channel occupancy information they would otherwise miss, enabling them to avoid hidden node problems while maintaining the base station's centralized control.
Solution Approach 2:
The system implements feedback by having LAA terminals transmit acquired channel occupancy information back to WLAN terminals. This feedback mechanism ensures that channel occupancy status is shared across different terminal types, allowing WLAN terminals to adjust their transmission behavior based on current channel conditions.
2Productivity
If only LAA terminals decode base station control information, then resource allocation efficiency is improved, but information availability is reduced for other terminals
Solution Approach 1:
The system segments information transmission by separating the decoding function (performed by LAA terminals) from the information distribution function (performed by transmitting to both base station and WLAN terminals). This segmentation allows efficient resource allocation while ensuring information availability through targeted distribution.
Solution Approach 2:
LAA terminals perform multiple functions: they decode control information from the base station, acquire channel occupancy information, and forward this information to both the base station and WLAN terminals. This multi-functionality ensures that channel occupancy information is universally available to all terminal types while maintaining allocation efficiency.
Data Source
AI summary
A method of control information transmission for a terminal in a mobile communication system, and an apparatus therefor are provided. In the method of control information transmission, the terminal acquires unlicensed frequency channel occupancy information based on the control information received from a base station and transmits the unlicensed frequency channel occupancy information to other terminals operating on the same unlicensed frequency. The method of control information transmission includes receiving a first control information from a base station using a first radio communication protocol, acquiring channel occupancy information based on the first control information, and transmitting a second control information including the channel occupancy information to another terminal using a second radio communication protocol.