Uplink Reference Signal Transmission Coordination
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Solution Overview
Problem
Current solutions for sending uplink reference signals in high-frequency communication systems are imperfect, leading to inefficiencies and increased costs due to the need for multiple antennas and complex beamforming, which complicates the compensation for spatial fading and resource management.
Innovation Solution
The method involves using high-layer signalling or downlink control signalling to indicate or predefine the sending manner or resource for uplink reference signals, allowing terminals and base stations to coordinate the transmission of these signals, optimizing beamforming and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are used for beamforming in high-frequency communication, then spatial fading compensation is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the beamforming process into two distinct types: digital beamforming for downlink control channels (PDCCH) and analog beamforming for uplink reference signals (SRS). This segmentation allows each beamforming type to be optimized independently, reducing overall system complexity while maintaining effective spatial fading compensation through appropriate beamforming selection for different signal types
Solution Approach 2:
The patent introduces dynamic switching between different SRS sending manners (codebook-based and non-codebook-based) based on channel conditions and beamforming requirements. The terminal can dynamically adjust the SRS transmission mode, and the network can dynamically configure the appropriate sending manner through downlink control information, enabling adaptive optimization without permanent complexity increases
2Measurement precision
If multiple SRS resources are allocated for antenna-specific SRS, then uplink CSI measurement accuracy is improved, but resource utilization decreases
Solution Approach 1:
The patent makes SRS resources universal by allowing the same time-frequency resource to be shared among multiple terminals through different spatial layers or beams. Multiple terminals can simultaneously use the same SRS resource with different antenna ports or spatial filters, enabling one resource to serve multiple measurement purposes and improving overall resource utilization while maintaining measurement accuracy
Solution Approach 2:
The patent merges the functionality of multiple SRS resources by allowing codebook-based and non-codebook-based SRS to coexist and share resources. The network can configure both types of SRS resources and dynamically select which type to use based on channel conditions, merging their functions into a unified resource allocation framework that improves efficiency
3Adaptability or versatility
If aperiodic SRS triggering is implemented, then resource scheduling flexibility is improved, but signalling overhead increases
Solution Approach 1:
The patent implements partial aperiodic triggering by allowing the network to trigger aperiodic SRS only when necessary for specific scheduling decisions, rather than continuously triggering it. The downlink control information contains an aperiodic SRS trigger field that can be set to trigger SRS transmission selectively based on whether current channel conditions require updated measurements, reducing unnecessary signalling overhead while maintaining flexibility when needed
Data Source
AI summary
A method for sending uplink reference signal includes: indicating, by a base station using high-layer signalling or downlink control signalling, a terminal to send an uplink reference signal in one or more sending manners; or predefining, by both the base station and the terminal, a sending manner or resource used for sending the uplink reference signal.