Unlicensed Spectrum Buffering for Reliable 5G Downlink Transmission
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Solution Overview
Problem
In 5G NR mobile communication systems, the uncertainty of channel occupancy in unlicensed spectrum resources, such as 2.4 GHz and 5 GHz, leads to potential failures in downlink data transmission due to competition with other systems like Wi-Fi, as base stations using licensed spectrum scheduling methods may schedule resources that are already occupied.
Innovation Solution
A method where a base station performs channel detection in unlicensed spectrum resources to determine idle channels for downlink data transmission, buffers data information, and sends a scheduling instruction to a terminal with resource configuration information, allowing the terminal to acquire target information from buffered data after successful channel detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses licensed spectrum scheduling method to notify the terminal of preset resource allocation, then the scheduling efficiency is improved, but the transmission reliability deteriorates due to channel occupancy uncertainty in unlicensed spectrum
Solution Approach 1:
The base station performs channel detection and determines channel occupancy status before issuing scheduling instructions. The terminal buffers downlink data before receiving scheduling information, ensuring data is ready for immediate transmission once the channel is confirmed available, thus resolving the conflict between scheduling efficiency and transmission reliability
Solution Approach 2:
The base station sends scheduling information that includes resource configuration information of the preceding downlink transmission resource, providing feedback to the terminal about the actual channel usage status. This feedback mechanism allows the terminal to adjust its reception based on confirmed channel availability, improving transmission reliability while maintaining scheduling efficiency
2Reliability
If the base station performs channel detection and waits for channel availability before transmission, then the transmission reliability is improved, but the channel utilization efficiency deteriorates due to idle time
Solution Approach 1:
The terminal performs preliminary buffering of downlink data before receiving scheduling information. This preliminary action eliminates idle time between channel confirmation and data reception, allowing the system to maintain high transmission reliability while maximizing channel utilization efficiency by eliminating empty time slots
Solution Approach 2:
The system maintains continuous useful action by having the terminal ready to receive data immediately after channel detection succeeds. The buffering mechanism ensures that data transmission can start immediately without interruption or idle time, achieving both high reliability and high channel utilization efficiency
3Adaptability or versatility
If the base station transmits scheduling information before downlink data in unlicensed spectrum, then the scheduling flexibility is improved, but the data transmission may fail due to channel occupation by other systems
Solution Approach 1:
The terminal buffers downlink data before receiving scheduling information, ensuring that when the base station finally transmits data on the scheduled resource, the terminal is already prepared to receive it immediately. This preliminary buffering action maintains scheduling flexibility while ensuring data transmission reliability even in competitive unlicensed spectrum environments
Solution Approach 2:
The scheduling information acts as an intermediary that bridges the gap between channel detection and data transmission. By including resource configuration information of the preceding downlink transmission resource, it provides the terminal with advance knowledge of when and where to expect data, maintaining flexibility while ensuring reliable reception
Data Source
AI summary
A method for transmitting information is applicable to a terminal and includes: buffering data information carried by an unlicensed spectrum resource; acquiring a target scheduling instruction issued by a base station, the target scheduling instruction being configured to indicate resource configuration information of a preceding downlink transmission resource, and the preceding downlink transmission resource referring to an unlicensed spectrum resource that has completed transmission for downlink data before the base station issues scheduling information on the resource; acquiring target information sent by the base station from the buffered data information according to the target scheduling instruction.