CSI-RS Resource Triggering Across Subcarrier Spacing Ranges
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Solution Overview
Problem
In high-frequency New Radio (NR) systems, the use of larger subcarrier spacings (SCS) reduces OFDM symbol and slot intervals, leading to challenges in configuring and transmitting CSI-RS resources due to reduced cell coverage, beam switching time, and coverage loss, which affects efficient wireless signal transmission.
Innovation Solution
The proposed method involves configuring CSI-RS resources with non-overlapping subcarrier spacing ranges, employing extended CP lengths, and optimizing CSI-RS resource grouping and triggering to accommodate beam switching times, ensuring efficient transmission and reception of CSI-RS signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If larger subcarrier spacing (SCS) is used in high-frequency NR systems, then frequency coverage and spectral efficiency are improved, but OFDM symbol and slot intervals are reduced, leading to challenges in configuring and transmitting CSI-RS resources
Solution Approach 1:
The patent segments the SCS configuration into distinct non-overlapping ranges (first range with smaller SCS values and second range with larger SCS values), allowing different time-domain behaviors to be applied to different frequency ranges. This enables the system to maintain appropriate slot intervals for CSI-RS transmission while utilizing larger SCS for improved spectral efficiency in high-frequency bands.
Solution Approach 2:
The patent introduces dynamic triggering mechanisms where the network can flexibly activate CSI-RS transmission based on current system conditions. The triggering DCI can indicate different CSI-RS resource sets with different SCS configurations, allowing the system to adaptively adjust time-domain parameters based on whether larger SCS are needed for spectral efficiency or smaller SCS are required for adequate beam switching time.
2Power
If larger subcarrier spacing (SCS) is used, then frequency coverage is improved, but beam switching time is reduced, affecting CSI-RS transmission reliability
Solution Approach 1:
The patent applies different SCS characteristics to different frequency ranges and transmission scenarios. For high-frequency bands where frequency coverage is critical, larger SCS values are used. For transmissions requiring reliable beam switching, the system can fall back to smaller SCS values or apply special timing configurations. This local differentiation ensures that each region of the system operates with optimal parameters for its specific requirements.
Solution Approach 2:
The patent employs parameter changes by switching between different SCS values based on the operational context. When beam switching time is insufficient with larger SCS, the system can change the SCS parameter to a smaller value that provides adequate timing margins. This dynamic parameter adjustment maintains reliability while still enabling frequency coverage improvements when conditions permit.
3Productivity
If CSI-RS resources are configured with larger subcarrier spacing, then transmission capacity is improved, but cell coverage is reduced
Solution Approach 1:
The patent segments the service area into different zones with different SCS configurations. High-frequency cells can use larger SCS for improved capacity, while the system maintains the ability to use smaller SCS in areas where coverage is prioritized. This spatial segmentation allows the network to optimize capacity where feasible while preserving coverage capabilities where needed.
Solution Approach 2:
The patent introduces dynamic configuration capabilities where the network can adjust SCS parameters based on current deployment conditions and traffic requirements. When cell coverage is critical, the system can dynamically switch to smaller SCS values. When capacity optimization is the priority and coverage conditions permit, larger SCS values can be applied. This dynamic adaptability resolves the contradiction between coverage and capacity.
Data Source
AI summary
The present disclosure relates to a wireless communication system, and specifically to a method and device therefor, the method comprising the steps of: receiving CSI-RS resource configuration information; receiving DCI indicating CSI-RS transmission; and receiving CSI-RS in one or more CSI-RS resource sets corresponding to the DCI, wherein the DCI corresponds to a CSI-RS resource set in at most one slot on the basis that subcarrier spacing (SCS) within a first range is applied to the CSI-RS transmission, the DCI corresponds to a plurality of CSI-RS resource sets in different slots on the basis that SCS within a second range is applied to the CSI-RS transmission, the first range does not overlap the second range, and the second range is wider than the first range.