SS/PBCH Block Path Loss Estimation in Unlicensed Bands
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving signals in unlicensed bands due to interference and resource sharing complexities, particularly in channel measurement and path loss estimation for uplink transmissions.
Innovation Solution
A method and apparatus for a user equipment (UE) to perform channel measurement by receiving information related to the interval Q between synchronization signal/physical broadcast channel (SS/PBCH) blocks in a quasi-co-located relationship, estimating downlink path loss for uplink transmissions based on multiple SS/PBCH blocks with the same modulo value within a time window, and using this information for efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel measurement is performed using multiple SS/PBCH blocks in unlicensed bands, then measurement accuracy and path loss estimation improve, but system complexity and interference management difficulty increase
Solution Approach 1:
The patent segments SS/PBCH blocks into different types (first type with first periodicity, second type with second periodicity) and applies different measurement rules to each type. This segmentation allows the system to perform accurate channel measurements by selecting appropriate blocks for specific measurement purposes while managing complexity through type-based classification and selective measurement approaches.
2Adaptability or versatility
If SS/PBCH blocks are transmitted with different periodicities, then resource allocation flexibility improves, but interference management and synchronization difficulty increase
Solution Approach 1:
The patent applies different measurement configurations and rules to different types of SS/PBCH blocks based on their local characteristics (periodicity, type designation). First type blocks use one measurement configuration while second type blocks use another, allowing optimized resource allocation for each type while managing interference through type-specific measurement rules and selective combination approaches.
3Reliability
If path loss estimation uses multiple SS/PBCH blocks within a time window, then uplink transmission reliability improves, but processing time and computational load increase
Solution Approach 1:
The patent performs channel measurements and path loss estimations using pre-configured SS/PBCH block types and measurement rules before uplink transmission. By establishing measurement configurations in advance and using predetermined time windows for measurement, the system prepares path loss information proactively, reducing real-time processing delays while maintaining reliable uplink transmission through accumulated measurement data.
Data Source
AI summary
The present invention relates to a wireless communication system and, particularly, to a method comprising the steps of: receiving information related to interval Q between SS/PBCH blocks in a QCL relationship in an unlicensed band, through a PBCH; and estimating a downlink path loss for uplink transmission on the basis of a plurality of SS/PBCH blocks having the same modulo (X, Q) value as a specific SS/PBCH block index within a time window in the unlicensed band, and an apparatus therefor.