SSB Configuration Indication for Unlicensed Spectrum Detection
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Solution Overview
Problem
In new radio (NR) systems, the dynamic and non-fixed positions of synchronization signal blocks (SSBs) in unlicensed spectrums pose challenges for devices to efficiently transmit signals while adhering to the listen-before-talk (LBT) principle.
Innovation Solution
The method involves generating configuration information by an access network device to indicate the presence of one or two SSB candidate positions in a time slot, and transmitting this information through the physical broadcast channel (PBCH) of the SSB. This allows terminals to determine the correct SSB candidate positions for signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the access network device sends SSB at non-fixed positions in each period according to LBT principle, then the flexibility of channel access is improved, but the complexity of signal detection for terminals increases
Solution Approach 1:
The access network device performs preliminary action by sending indication information in advance to tell terminals about the SSB candidate position configuration (one or two positions per slot). This allows terminals to prepare their detection strategy beforehand, reducing detection complexity while maintaining the flexibility of non-fixed SSB positions due to LBT
Solution Approach 2:
The SSB candidate positions are segmented into a limited set of options (one or two positions per time slot) as indicated by the access network device. This segmentation provides a structured approach for terminals to search, reducing the complexity compared to searching all possible positions while still allowing flexible actual positions
2Reliability
If terminals scan all possible SSB candidate positions to ensure detection, then the reliability of signal reception is improved, but the power consumption increases
Solution Approach 1:
The access network device provides preliminary information about the actual SSB position configuration before terminals perform detection. Terminals use this indication information to directly target the correct candidate positions, ensuring reliable reception without needing to exhaustively scan all possible positions, thus reducing power consumption
Solution Approach 2:
The indication information sent from the access network device acts as feedback that guides terminal behavior. This feedback mechanism ensures terminals can reliably detect SSB at the correct positions without wasting energy on unnecessary scanning of other positions
3Reliability
If the number of SSB candidate positions per time slot increases, then the probability of successful SSB transmission is improved, but the time required for terminal detection increases
Solution Approach 1:
The access network device performs preliminary action by indicating whether there is one or two SSB candidate positions per time slot. This allows terminals to adjust their detection strategy in advance, maintaining high transmission success probability through multiple candidate positions while minimizing detection time by knowing exactly how many positions to check
Data Source
AI summary
An information transmission method. The method comprises: generating configuration information, wherein the configuration information is used for indicating that there is a synchronization signal block (SSB) candidate position in a time slot or the configuration information is used for indicating that there are two SSB candidate positions in a time slot, and the SSB candidate position is a time domain position where an access network device might send an SSB; and sending the SSB, wherein a PBCH of the SSB carries the configuration information.