Multi-TRP PDCCH Search Space Association for Robust Control Signaling
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Solution Overview
Problem
The New Radio (NR) Rel-16 protocol lacks a detailed solution for multi-Transmission/Reception Point (TRP) transmission of physical downlink control channel (PDCCH), limiting the flexibility and robustness of communication systems.
Innovation Solution
A method for PDCCH configuration involving N associated search spaces, where N physical downlink control channels (PDCCHs) are linked, enhancing PDCCH transmission by associating them with each other, and optimizing parameters such as CORESETs, TCI states, and QCL types to improve coverage and reduce implementation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TRPs simultaneously transmit downlink data to UE using NR Rel-16 protocol, then downlink data transmission is supported, but downlink control information transmission from multiple TRPs to the same UE is not supported
Solution Approach 1:
The patent segments the control information transmission by introducing separate PDCCH configurations for different TRPs. Each TRP is assigned dedicated search spaces and PDCCH resources, allowing independent configuration and management of control channels from multiple transmission points, thereby enabling multi-TRP control information transmission while maintaining manageable complexity through modular organization
Solution Approach 2:
The patent introduces search space sets as intermediary structures that mediate between multiple TRPs and the UE. These search space sets serve as organized containers that associate PDCCH candidates with specific TRPs, providing a systematic framework for the UE to monitor and differentiate control information from different transmission points without overwhelming complexity
2Adaptability or versatility
If traditional single PDCCH configuration is used, then configuration simplicity is maintained, but flexibility and robustness in multi-TRP scenarios are insufficient
Solution Approach 1:
The patent implements dynamic PDCCH configuration where search space sets can be selectively activated or deactivated based on multi-TRP deployment scenarios. The configuration allows dynamic association of PDCCH candidates with different TRPs through search space set identifiers, enabling the system to adapt its complexity level according to operational requirements while maintaining flexibility for various communication scenarios
Solution Approach 2:
The patent creates a universal PDCCH configuration framework that can function in both single-TRP and multi-TRP scenarios. The search space set structure serves multiple purposes: it organizes PDCCH candidates, identifies associated TRPs, and provides monitoring configurations, thereby achieving multi-functionality that enhances flexibility without proportionally increasing complexity
3Reliability
If multiple PDCCHs are transmitted from different TRPs without association, then transmission diversity is achieved, but monitoring and management efficiency decreases
Solution Approach 1:
The patent merges the monitoring of multiple PDCCHs from different TRPs into a unified search space set structure. By combining PDCCH candidates from multiple TRPs within organized search space sets and using common monitoring configurations, the UE can efficiently monitor control information from multiple transmission points simultaneously, maintaining transmission reliability while improving monitoring efficiency through consolidated processing
Data Source
AI summary
Provided in the embodiments of the present invention are a physical downlink control channel (PDCCH) configuration method, a terminal device and a storage medium, which are used for realizing multi-TRP enhancement of a PDCCH. The embodiments of the present invention may comprise: a first terminal device receiving first configuration information sent by a first device, wherein the first configuration information indicates N first search spaces; PDCCHs corresponding to the N first search spaces are associated with each other, and/or the N first search spaces are associated with each other; the N first search spaces correspond to the PDCCHs; and N is an integer greater than or equal to 2.