Aperiodic CSI-RS Reception with QCL Beam Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting multiple transmission reception points (TRPs) and determining beam assumptions for aperiodic channel state information-reference signals (CSI-RS), leading to potential terminal malfunctions.
Innovation Solution
A method for transmitting and receiving aperiodic CSI-RS with a scheduling offset smaller than the beam switch timing, using quasi co-location (QCL) assumptions based on the same CORESET pool index for the control resource set, ensuring a default reception beam in systems with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a scheduling offset smaller than beam switch timing is used for aperiodic CSI-RS, then resource utilization and transmission efficiency are improved, but terminal malfunction occurs due to inability to determine reception beam
Solution Approach 1:
The patent introduces CORESET pool index as an intermediary parameter to determine the QCL assumption for aperiodic CSI-RS reception. When the scheduling offset is smaller than beam switch timing, the terminal uses the CORESET pool index from the DCI to identify the appropriate QCL assumption, which serves as a mediator between the control signal and the physical reception beam, enabling reliable beam determination under tight scheduling conditions.
Solution Approach 2:
The patent establishes preliminary QCL assumptions associated with different CORESET pool indices before the aperiodic CSI-RS transmission occurs. The network configures multiple QCL assumptions in advance, each linked to a specific CORESET pool index, so that when the DCI is received with a scheduling offset smaller than beam switch timing, the terminal can immediately apply the pre-configured QCL assumption corresponding to the indicated CORESET pool index without requiring time-consuming beam switching.
2Adaptability or versatility
If multiple TRPs are supported in the system, then system capacity and coverage are improved, but complexity increases in determining the default reception beam for aperiodic CSI-RS
Solution Approach 1:
The patent segments the beam determination process by introducing CORESET pool indices that are associated with different TRPs. Each CORESET pool index (e.g., 0 or 1) corresponds to a specific TRP and its associated QCL assumptions. This segmentation allows the terminal to handle multiple TRPs independently by selecting the appropriate CORESET pool index from the DCI, thereby managing multi-TRP complexity through structured division rather than unified complex processing.
Solution Approach 2:
The patent enables the DCI to carry the CORESET pool index information that allows the terminal to self-determine the appropriate QCL assumption and reception beam without requiring additional explicit beam indication from the network. The terminal uses the CORESET pool index to autonomously select the corresponding pre-configured QCL assumption, making the beam determination process self-service and reducing the complexity of multi-TRP coordination.
Data Source
AI summary
A method and a device for transmitting/receiving a CSI-RS in a wireless communication system are disclosed. A method for receiving an aperiodic channel state information-reference signal (CSI-RS), according to one embodiment of the present disclosure, may comprise steps of: receiving, from a base station, downlink control information (DCI) for triggering the aperiodic CSI-RS; and receiving, from the base station, the aperiodic CSI-RS on the basis of the DCI, wherein, on the basis the scheduling offset of the aperiodic CSI-RS being smaller than the beam switch timing of a terminal, a quasi co-location (QCL) assumption of a downlink signal associated with the same CORESET pool index as the CORESET pool index of a control resource set (CORESET) for the DCI can be applied for the reception of the aperiodic CSI-RS.