Bitmap-Guided Control Channel Repetition for Multi-TRP DCI Coverage
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing control channel repetitions to enhance reliability and coverage, particularly in environments with varying signal quality and interference.
Innovation Solution
Implementing a mechanism for control channel repetition across multiple time resources and/or transmission points (TRPs) using DCI-based configurations, including multi-carrier and multi-TRP approaches, to optimize channel quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel repetitions are transmitted across multiple time resources and TRPs, then control channel reliability and coverage are improved, but device complexity and processing overhead increase
Solution Approach 1:
The control channel transmission is segmented across multiple TRPs and time resources, where each TRP transmits a portion of the control channel information. This segmentation allows the system to achieve diversity gain and improved reliability without requiring the receiving device to handle excessively complex processing, as each segment can be independently received and combined.
Solution Approach 2:
The patent introduces spatial dimension by utilizing multiple TRPs (transmission points) in addition to time resources. This multi-dimensional approach (time + space) enhances control channel reliability through spatial diversity, allowing the receiving device to combine signals from different spatial locations, thereby improving robustness without proportionally increasing device complexity.
2Area of stationary object
If control channel repetitions are transmitted across multiple time resources and TRPs, then control channel coverage is improved, but signaling overhead and resource consumption increase
Solution Approach 1:
The DCI (Downlink Control Information) format is designed to serve multiple functions simultaneously: it carries scheduling information, indicates control channel repetition parameters, and provides resource allocation details. This multi-functionality reduces the need for separate signaling messages, thereby extending coverage through repeated transmissions without proportionally increasing signaling overhead.
Solution Approach 2:
The patent utilizes parameter changes in the DCI format to efficiently control control channel repetition behavior. By embedding repetition parameters (such as number of repetitions, time resource patterns, and TRP indications) within the existing DCI structure, the system can adapt transmission parameters dynamically without requiring additional dedicated signaling, thus improving coverage while managing overhead.
3Adaptability or versatility
If control channel repetitions are configured with multiple DCI formats, then adaptability to different network conditions is improved, but configuration complexity and processing time increase
Solution Approach 1:
The system employs dynamic selection of DCI formats and repetition parameters based on current network conditions, channel quality, and traffic requirements. This dynamic adaptation allows the network to optimize control channel transmission for varying conditions without requiring exhaustive configuration of all possible scenarios, thereby maintaining versatility while reducing processing time through condition-based decision making.
Solution Approach 2:
The patent implements preliminary configuration of DCI formats and repetition parameters through RRC (Radio Resource Control) signaling before actual control channel transmission. By pre-configuring multiple DCI formats and their associated parameters, the system prepares the receiving device in advance, enabling faster adaptation to different network conditions during operation without requiring complex real-time processing and configuration.
Data Source
AI summary
A wireless device receives configuration parameters indicating: a control resource set (coreset) configured with a first transmission configuration indicator (TCI) state and a second TCI state; and a bitmap comprising a plurality of bits. Each bit of the plurality of bits indicates one of the first TCI state or the second TCI state and is for a respective repetition of repetitions of a downlink control information (DCI). The wireless device receive, via a search space associated with the coreset, each of a plurality of repetitions of a first DCI using an associated TCI state indicated by a respective bit of the plurality of bits.