DCI Transmission via Multi-TCI PDCCH Candidates
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Solution Overview
Problem
In millimeter wave band communication, the blocking effect caused by obstacles such as human bodies or vehicles significantly impacts the reliability of control information transmission, necessitating improved methods to enhance reliability.
Innovation Solution
The method involves carrying the same DCI on multiple PDCCH candidates, each corresponding to at least two TCI states, and transmitting it through these candidates to improve reliability, utilizing cooperative transmission across multiple TRPs or antenna panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control information is transmitted through a single PDCCH candidate, then the device complexity is low, but the transmission reliability deteriorates due to blocking effects in millimeter wave band
Solution Approach 1:
The control information transmission is segmented across multiple PDCCH candidates, each associated with different TCI states. The base station divides the transmission task into multiple parallel paths, where each path corresponds to a specific PDCCH candidate and TCI state combination, allowing the terminal to receive and combine information from multiple segments to achieve reliable decoding
Solution Approach 2:
The patent introduces an additional dimension of diversity by associating multiple TCI states with each PDCCH candidate. This creates a multi-dimensional transmission space where diversity is achieved not only through multiple candidates but also through multiple TCI states within each candidate, effectively adding a new dimension to the transmission reliability mechanism
2Reliability
If multiple PDCCH candidates with multiple TCI states are used, then the transmission reliability improves, but the loss of information increases due to potential failures in multiple transmission paths
Solution Approach 1:
The system prepares multiple PDCCH candidates with different TCI state associations in advance, creating a cushion of redundant transmission paths before information loss can occur. This proactive approach ensures that if some paths fail due to blocking, other pre-prepared paths are already in place to carry the control information
Solution Approach 2:
The patent changes the parameter of TCI state association by configuring multiple TCI states for each PDCCH candidate rather than a one-to-one mapping. This parameter change allows the system to adapt to different channel conditions and blocking scenarios, maintaining information integrity across varying transmission environments
Data Source
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AI summary
Embodiments of the present application provide a control information transmission method and device. In the embodiments of the present application, a base station carries the same DCI on N PDCCH candidates used for DCI collaborative transmission, at least one PDCCH candidate among the N PDCCH candidates corresponding to at least two TCI states, and N being an integer greater than or equal to 1; and the base station sends the DCI by means of a PDCCH among the N PDCCH candidates used for DCI collaborative transmission. The reliability of DCI transmission is improved.