CSI-RS Configuration for Mobility Measurement Gaps in Wireless Systems
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Solution Overview
Problem
Existing CSI-RS configurations in wireless communication systems face limitations in configuring measurement gaps for intra-frequency and inter-frequency environments, leading to scheduling restrictions that degrade both downlink and uplink performance, especially when supporting mixed numerologies in Frequency Range 1 (FR1) and Frequency Range 2 (FR2).
Innovation Solution
The proposed solution involves new CSI-RS configurations that allow for a single and fixed center frequency, fixed channel bandwidth, and flexible configuration of CSI-RS resources, including periodicities and measurement timing, to optimize measurement gaps. This includes configuring up to N periodicities for intra-frequency layers and fewer periodicities for inter-frequency layers, with a window of contiguous slots for CSI-RS measurements, and enabling measurement gap sharing for dual connectivity scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement gaps are configured for CSI-RS in existing systems, then mobility measurements can be performed, but scheduling restrictions occur that degrade downlink and uplink performance
Solution Approach 1:
The patent implements dynamic measurement timing configuration where the measurement window is positioned within a sliding window of L contiguous slots. This allows the measurement timing to adapt to different scheduling scenarios while maintaining mobility measurement capability, resolving the contradiction between measurement precision and scheduling flexibility.
Solution Approach 2:
The patent pre-configures a measurement timing configuration (CMTC) that defines a window of L contiguous slots within a predetermined time frame. This preliminary configuration allows the UE to know in advance when measurements will occur, enabling better scheduling planning and reducing performance degradation.
2Device complexity
If fixed CSI-RS configuration is used, then configuration simplicity is maintained, but flexibility in supporting mixed numerologies in FR1 and FR2 is limited
Solution Approach 1:
The patent creates a universal measurement timing configuration that works across both FR1 and FR2 with different numerologies. The CMTC window of L contiguous slots can be adapted to different subcarrier spacings and frame structures, providing multi-functionality that maintains simplicity while supporting diverse scenarios.
Solution Approach 2:
The patent allows dynamic adjustment of parameters within the measurement configuration, including the window size L, the time frame duration, and the positioning of the measurement window. These parameter changes enable the system to adapt to different numerologies in FR1 and FR2 while maintaining a unified configuration approach.
3Measurement precision
If measurement gaps are configured for each frequency layer, then comprehensive measurements are achieved, but scheduling restrictions and resource waste increase
Solution Approach 1:
The patent merges measurement opportunities across multiple frequency layers by defining a unified measurement timing configuration. Instead of configuring separate measurement gaps for each layer, the CMTC window allows measurements on multiple layers within the same time window, reducing overall scheduling restrictions and improving resource utilization.
Solution Approach 2:
The patent ensures continuous measurement capability by positioning the measurement window within a sliding window of L contiguous slots. This continuous approach allows measurements to be performed regularly without creating excessive gaps in scheduling, maintaining both measurement coverage and resource efficiency.
Data Source
AI summary
Techniques for channel state information reference signal (CSI-RS) configuration in wireless communications are disclosed. A user equipment (UE) may decode a message including a CSI-RS configuration that indicates a CSI-RS window associated with one or more CSI-RS, with respect to one or more mobility related measurements. The UE may determine one or more mobility related measurements using the CSI-RS configuration, and measure the one or more CSI-RS using the determination of the one or more mobility related measurements. The UE may generate a report for the base station corresponding to the measurement of the one or more CSI-RS.