PDCCH Transmission via ILJT Beam Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multiple physical downlink control channels (PDCCHs) and physical downlink shared channels (PDSCHs) due to ambiguity in reception beam configuration, especially in multi-PDCCH based independent layer joint transmission (ILJT) operations, which affects latency and reliability.
Innovation Solution
A method is introduced where a base station receives UE capability information regarding the number of simultaneously supportable beams and transmits ILJT-related configuration information to the UE, allowing for the configuration of control resource sets based on the UE's capability, enabling the transmission of PDCCHs with specific QCL information for spatial parameters, thereby resolving ambiguity in beam configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCHs are transmitted to support multi-TRP/panel operations, then the data rate and reliability are improved, but the device complexity and beam configuration ambiguity increase
Solution Approach 1:
The base station performs preliminary actions by determining the QCL relationship between different PDCCHs before transmission, and pre-configures the UE with appropriate QCL assumptions. This preliminary determination of spatial parameters eliminates configuration ambiguity during actual multi-PDCCH reception, resolving the contradiction between improved reliability through multiple PDCCHs and the complexity of beam configuration management.
2Measurement precision
If QCL information is provided for each PDCCH, then the beam configuration precision is improved, but the loss of information increases due to additional signaling overhead
Solution Approach 1:
The invention applies universality by establishing that PDCCHs with the same CORESET group ID share a common QCL assumption with respect to spatial parameters. This multi-functional approach allows a single QCL configuration to serve multiple PDCCHs simultaneously, providing precise beam configuration without requiring separate QCL information for each PDCCH, thus reducing signaling overhead while maintaining configuration precision.
3Adaptability or versatility
If the number of simultaneously supportable beams is increased, then the adaptability for multi-TRP operations is improved, but the device complexity increases
Solution Approach 1:
The invention applies local quality by differentiating the capability requirements for different PDCCH configurations. Instead of requiring the UE to support a large number of simultaneous beams across all scenarios, the system only requires the UE to support the specific number of beams needed for each particular multi-TRP configuration. This localized capability requirement maintains adaptability for multi-TRP operations while reducing overall UE capability complexity.
Data Source
AI summary
The present specification proposes a method for transmitting and receiving a plurality of PDCCHs in a wireless communication system, and a device therefor. Specifically, a method performed by a base station comprises: a step for receiving, from a UE, UE capability information indicating the number of beams that can be simultaneously supported; a step for transmitting independent layer joint transmission (ILJT)-related setting information to the UE; and a step for transmitting the plurality of PDCCHs to the UE on the basis of the ILJT-related setting information, wherein the ILJT-related setting information may be determined on the basis of the UE capability information.