Reference Signal Transmission in Unlicensed Spectrum
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Solution Overview
Problem
In NR unlicensed spectrum, the low availability of channels hampers the transmission of synchronization signal blocks, significantly reducing the chances of time domain synchronization between base stations and user equipment.
Innovation Solution
A method and device for transmitting a reference signal, where possible transmission positions are determined based on a setting signal within the synchronization signal block, with channel detection preceding transmission, and the signal is sent when the channel is idle, ensuring consistent indexes across positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel detection is performed before transmission at multiple possible positions, then the reliability of reference signal transmission is improved, but the time overhead and complexity of transmission procedure increases
Solution Approach 1:
The base station performs channel detection at multiple possible transmission positions before actually transmitting the reference signal. This preliminary action ensures that when transmission occurs, the channel is ready, improving reliability while the multiple detection positions provide redundancy against channel unavailability
Solution Approach 2:
The transmission position of the reference signal is made dynamic rather than fixed. The base station selects from multiple possible transmission positions based on channel conditions detected at each position, allowing the system to adapt to changing channel availability in unlicensed spectrum
2Productivity
If multiple possible transmission positions are used for reference signal, then the productivity of synchronization is improved, but the device complexity increases
Solution Approach 1:
The transmission opportunity is segmented into multiple discrete possible positions rather than a single fixed position. Each position can be independently evaluated through channel detection, allowing the system to divide the synchronization task into manageable segments that can be attempted in sequence
Solution Approach 2:
The system uses channel detection results as feedback to determine whether to transmit at each possible position. The user equipment also provides feedback through uplink signals that help the base station determine appropriate transmission positions, creating a closed-loop system that improves synchronization efficiency
3Adaptability or versatility
If channel detection is performed at each possible transmission position, then the adaptability to unlicensed spectrum is improved, but the energy consumption increases
Solution Approach 1:
The base station performs channel detection at multiple possible positions, which may be more than strictly necessary in some cases. This excessive action ensures adaptability to unlicensed spectrum conditions where channel availability is uncertain, while the system accepts the additional energy cost as necessary for reliable operation in this environment
Solution Approach 2:
Channel detection is performed periodically at predetermined intervals corresponding to the possible transmission positions. This periodic approach allows the system to efficiently monitor channel conditions without continuous detection, balancing adaptability with energy conservation
Data Source
AI summary
A method for transmitting reference signal, a method for receiving reference signal, base station and user equipment are provided. The method includes: obtaining a plurality of possible transmission positions of the reference signal according to a position where a setting signal is located, wherein the setting signal is located in the reference signal and is used to determine an index of the reference signal, and the plurality of possible transmission positions comprise an initial possible transmission position of the reference signal; performing channel detection before transmitting the reference signal at each of the possible transmission positions; and transmitting, in response to detecting that a channel is idle, the reference signal at a corresponding possible transmission position; wherein the reference signal includes a SSB, and the setting signal comprises PBCH in the SSB; the indexes of the reference signal corresponding to the plurality of possible transmission positions are the same.