Dynamic SSB Transmission in Unlicensed Bands
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Solution Overview
Problem
In New Radio (NR) systems, transmitting a Synchronization Signal Block (SSB) in an unlicensed band is challenging due to the need to identify idle carrier times without pre-specifying fixed candidate time positions, which can lead to synchronization issues and inefficient signal reception.
Innovation Solution
A method where network devices monitor and determine M candidate time positions within a single sending cycle of the SSB to identify idle carrier times in an unlicensed band, allowing flexible transmission and reception of the SSB without fixed timing, using a combination of monitoring and indication signals to adapt beam directions and patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed candidate time positions are used for SSB transmission in unlicensed band, then signal reception can be simplified, but synchronization reliability deteriorates and collision risk increases
Solution Approach 1:
The patent applies dynamics by transitioning from fixed candidate time positions to dynamic selection. The network device dynamically determines M candidate time positions from L possible positions based on real-time carrier status monitoring. This allows the system to adapt to changing channel conditions while maintaining synchronization reliability through flexible timing adjustment rather than rigid fixed positions.
Solution Approach 2:
The patent implements feedback mechanisms where the network device monitors carrier status and uses this information to determine which candidate time positions are actually used for SSB transmission. The terminal device receives indication information about the selected positions, creating a feedback loop that ensures reliable synchronization while avoiding collisions in the unlicensed band.
2Reliability
If M candidate time positions are determined from L possible positions, then collision risk is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the L possible candidate time positions into M selected positions based on carrier status. Instead of treating all L positions uniformly, the system segments the possibilities and selects only the appropriate M positions for actual transmission. This reduces collision risk by focusing on available time slots while managing complexity through structured selection criteria.
Solution Approach 2:
The patent uses parameter changes by varying the number of candidate time positions from L possible positions to M actual transmission positions. The system changes the parameter of active candidate positions based on carrier status, transitioning between different numbers of positions to optimize both collision avoidance and implementation complexity.
3Productivity
If unlicensed band is used for NR communication, then spectrum utilization is improved, but carrier sensing complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network device perform carrier status monitoring before determining the M candidate time positions for SSB transmission. This advance carrier sensing allows the system to prepare the transmission schedule in advance, reducing real-time complexity while maintaining efficient spectrum utilization in the unlicensed band.
Data Source
AI summary
A wireless communication method and device are provided. The method includes: a network device detecting, on the basis of M candidate time positions of a synchronous signal block, whether a carrier on an unlicensed frequency band is idle, the M candidate time positions being at least part of L candidate time positions of the synchronous signal block, the L candidate time positions being all the candidate time positions within a single transmission period of the synchronous signal block; according to a detection result, the network device sending the synchronous signal block at at least one of the M candidate time positions.