Control Channel Repetition Across TRPs for Reliable Downlink Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable downlink signal reception, particularly in environments with high interference or varying channel conditions, which can lead to dropped connections and reduced data throughput.
Innovation Solution
Implementing control channel repetition across multiple transmission reception points (TRPs) to enhance the reliability and robustness of downlink signal reception by utilizing advanced beam management and configuration parameters, such as TCI states and MAC CEs, to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel repetition is implemented across multiple TRPs, then downlink signal reception reliability is improved, but device complexity and network configuration complexity increase
Solution Approach 1:
The control channel transmission is segmented across multiple Transmission Reception Points (TRPs), where each TRP transmits a portion of the control channel repetition. This segmentation allows the system to achieve diversity gain and improved reliability without requiring a single complex centralized transmitter, distributing the complexity across multiple simpler TRPs.
Solution Approach 2:
Instead of having a single TRP transmit all control channel repetitions, the patent inverts the approach by having multiple TRPs simultaneously transmit different repetitions. This inversion of the traditional single-point transmission model reduces the burden on individual TRPs and simplifies the overall system architecture while maintaining high reliability.
2Reliability
If control channel repetition is implemented across multiple TRPs, then downlink signal reception reliability is improved, but interference management becomes more difficult
Solution Approach 1:
Each TRP transmits control channel repetitions with locally optimized parameters including TRP-specific quasi-co-located (QCL) assumptions and TRP-specific reference signal configurations. This local quality approach allows each TRP to adapt its transmission to its specific channel conditions and interference environment, improving overall reliability while managing interference through localized optimization rather than global coordination.
Solution Approach 2:
The patent employs parameter changes by configuring different TCI (Transmission Configuration Indicator) states for different TRPs, allowing each TRP to use optimized transmission parameters such as beam directions, reference signal powers, and QCL assumptions. These parameter variations enable the system to mitigate interference by diversifying the transmission characteristics across TRPs.
3Reliability
If advanced beam management and TCI states are used to optimize signal transmission, then downlink signal reception reliability is improved, but processing overhead and configuration complexity increase
Solution Approach 1:
The network performs preliminary configuration of TCI states and beam management parameters before actual control channel transmission. By pre-configuring multiple TCI states and establishing beam relationships in advance, the system reduces real-time processing overhead during control channel reception while maintaining high reliability through optimized beam selection and TRP coordination.
Data Source
AI summary
A wireless device receives one or more radio resource control (RRC) messages indicating a plurality of transmission configuration indicator (TCI) states for a control resource set (coreset) having a lowest coreset index in an active downlink bandwidth part of a cell. The wireless device receives a medium access control (MAC) control element (CE) indicating activation of at least two TCI states of the plurality of TCI states for the coreset with the lowest coreset index. The MAC CE comprises an ordered set of TCI state identifiers (IDs) of the at least two TCI states. The wireless device receives downlink control information (DCI) scheduling a downlink signal. The wireless device selects a first TCI state, among the at least two TCI states, with a TCI state ID that occurs first in the ordered set of TCI state IDs. The wireless device receives the downlink signal based on the first TCI state.