Multi-TRP PDCCH Repetition Using Search Space Group Association
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Solution Overview
Problem
In next-generation mobile communication systems, there is a need for a technology to support correlation between search space information of multiple transmission and reception points (TRPs) for physical downlink control channel (PDCCH) repetitive transmission, which is essential for improving reliability in beam-based communication.
Innovation Solution
A method and apparatus that involve transmitting configuration information for associating at least two search spaces and a group identity through radio resource control (RRC) signaling, enabling PDCCH repetitive transmission across multiple TRPs, and providing updated configuration information to terminals for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetitive transmission is supported through multiple TRPs, then reliability of PDCCH reception is improved, but device complexity increases due to need for search space association configuration
Solution Approach 1:
The patent segments the search space configuration by introducing a search space group ID that associates multiple search spaces with a common TRP group. This allows the terminal to independently configure and manage associations between search spaces and TRPs, reducing overall system complexity while enabling reliable multi-TRP reception.
Solution Approach 2:
The patent performs preliminary configuration by pre-establishing search space associations with TRPs through RRC signaling before actual PDCCH transmission. The terminal receives and stores the search space group ID mappings in advance, so that when PDCCH repetitive transmission occurs across multiple TRPs, the terminal can immediately identify and combine the transmissions without real-time configuration complexity.
2Adaptability or versatility
If search space association configuration is provided through RRC signaling, then adaptability of PDCCH transmission is improved, but loss of time occurs due to configuration signaling overhead
Solution Approach 1:
The patent uses the search space group ID as a compact identifier that copies or references the association relationship between multiple search spaces and TRPs. Instead of transmitting full configuration details for each search space-TRP mapping, the system transmits a single group ID that represents the entire association, significantly reducing signaling overhead and time while maintaining full adaptability.
Solution Approach 2:
The search space group ID serves multiple functions simultaneously: it identifies the TRP group, associates multiple search spaces together, and enables the terminal to perform blind decoding across associated search spaces. This multi-functionality reduces the need for separate configuration messages, thereby reducing time loss while maintaining adaptability.
Data Source
AI summary
Disclosed are a communication scheme and a system thereof for converging IoT technology and a 5G communication system for supporting a higher data transmission rate beyond that of a 4G system. The disclosure can be applied to intelligent services (for example, services related to smart homes, smart buildings, smart cities, smart cars, connected cars, health care, digital education, retail business, security, and safety) based on the 5G communication technology and the IoT-related technology. The disclosure discloses a method and an apparatus for supporting PDCCH repetitive transmission through a plurality of transmission and reception points.