Uplink MIMO SRS and CSI-RS Configuration Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently configuring and managing sounding reference signals (SRS) and channel state information reference signals (CSI-RS) for uplink multiple input multiple output (MIMO) transmissions, particularly in 5G systems, leading to conflicts and redundant signaling due to shared configurations.
Innovation Solution
The proposed solution involves mechanisms for controlling SRS and CSI-RS configurations, including restriction of configurations and MAC control element-based reconfiguration to reduce latency and optimize time domain behavior, allowing for flexible and efficient resource mapping patterns and triggering mechanisms for SRS resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If three types of CSI-RS and four types of SRS share the same configuration, then device complexity is reduced, but conflicts and redundant signaling occur
Solution Approach 1:
The patent segments the configuration management by introducing separate higher-layer parameters for different reference signal types. Specifically, it divides CSI-RS configuration into three distinct parameter sets (csi-RS-Config for CSI acquisition, csi-RS-ConfigL1 for L1-RSRP computation, and csi-RS-ConfigL1 for tracking) and SRS configuration into four distinct parameter sets (srs-Config for codebook based transmission, srs-Config for non-codebook transmission, srs-Config for beam management, and srs-Config for antenna switching). This segmentation eliminates conflicts and redundant signaling while maintaining manageable device complexity through systematic organization.
2Adaptability or versatility
If SRS resources are configured with multiple parameters including frequency offset, comb, and number of symbols, then resource mapping flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the resource mapping parameters (frequency offset, comb, and number of symbols) from the general SRS configuration and places them in a dedicated resource mapping pattern configuration structure. This extraction allows these parameters to be configured independently and reused across different SRS resource types, reducing redundant signaling while maintaining the flexibility to configure different resource mapping patterns for different SRS purposes.
Solution Approach 2:
The patent creates a universal resource mapping pattern configuration that can be applied to multiple SRS resource types. By defining a common set of parameters (frequency offset, comb, number of symbols) that can be configured once and reused across different SRS configurations, the system achieves resource mapping flexibility without proportionally increasing signaling overhead. The same parameter structure serves multiple functions across different SRS usage scenarios.
3Device complexity
If UE is not configured with SRS resource for codebook based transmission, then configuration simplicity is improved, but link adaptation capability deteriorates
Solution Approach 1:
The patent enables the UE to self-configure DM-RS based link adaptation when SRS resources are not configured for codebook based transmission. The UE can autonomously select appropriate DM-RS parameters and configure the uplink precoder based on available channel state information, maintaining link adaptation capability without requiring explicit SRS configuration. This self-service approach preserves reliability while keeping configuration simple.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided for time domain resource allocations in wireless communications systems. Disclosed embodiments include time-domain symbol determination and/or indication using a combination of higher layer and downlink control information signaling for physical downlink shared channel and physical uplink shared channel; time domain resource allocations for mini-slot operations; rules for postponing and dropping for multiple mini-slot transmission; and collision handling of sounding reference signals with semi-statically or semi-persistently configured uplink transmissions. Other embodiments may be described and/or claimed.