CSI-RS Configuration with Multiple Offsets for LBT Contention
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring and transmitting channel state information reference signals (CSI-RS) over shared radio frequency spectrum bands, particularly in scenarios with listen-before-talk (LBT) resource contention, which affects channel estimation and measurement accuracy.
Innovation Solution
A CSI-RS configuration that indicates a period and multiple offsets is used to facilitate CSI-RS transmission, allowing the base station to select appropriate offsets for transmission and the user equipment to receive and measure CSI-RS accordingly, even in cases where LBT fails, by multiplexing CSI-RS with synchronization signal blocks during discovery reference signal slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSI-RS is transmitted over shared radio frequency spectrum bands with LBT, then spectrum utilization is improved, but transmission reliability deteriorates due to LBT resource contention
Solution Approach 1:
The system dynamically adjusts CSI-RS transmission by configuring multiple candidate offsets within a period, allowing the base station to select appropriate transmission时机 based on LBT outcomes. This dynamic adaptation enables reliable CSI-RS transmission over shared spectrum by flexibly responding to channel access conditions
Solution Approach 2:
The invention changes the temporal parameters of CSI-RS transmission by introducing multiple offsets (first offset, second offset, etc.) within a configured period. This parameter variation allows the system to attempt transmission at multiple different time positions, improving reliability by increasing the probability of successful LBT and transmission
2Reliability
If multiple offsets are configured for CSI-RS transmission, then transmission reliability is improved, but configuration complexity increases
Solution Approach 1:
The system configures multiple offsets beyond what a single offset would provide, creating redundant transmission opportunities. This excessive configuration ensures that even if some offset attempts fail due to LBT contention, other offsets remain available, improving reliability while keeping the configuration manageable through standardized patterns
3Productivity
If CSI-RS transmission attempts are made despite LBT failure, then measurement coverage is improved, but measurement accuracy deteriorates
Solution Approach 1:
The base station performs LBT checks before CSI-RS transmission and only transmits when channel access is successful. This preliminary action ensures that CSI-RS measurements are based on valid, interference-free transmissions, maintaining measurement accuracy while achieving broad coverage through multiple offset attempts
Data Source
AI summary
A channel state information reference signal configuration (CSI-RS configuration) indicates a period and a plurality of offsets. For example, a base station may send a channel state information reference signal (CSI-RS) to a wireless communication device (e.g., a user equipment) according to the period and at least one of the offsets indicated by the CSI-RS configuration.