DCI Scheduling for Multi-Cell PDCCH Detection
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Solution Overview
Problem
In mobile communication systems, terminal devices face challenges in blindly detecting physical downlink control channels (PDCCH) without specific time-frequency resource location information from base stations, leading to inefficiencies in scheduling multiple cells with varying parameters.
Innovation Solution
A wireless communication method where terminal devices and network devices exchange capability indication information to manage scheduling cells and parameters, allowing for flexible scheduling of channels across multiple cells with the same or different sub-carrier spaces and cyclic prefixes, and adjusting PDCCH detection capabilities based on adjustment coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminal devices blindly detect PDCCH without specific time-frequency resource location information, then the base station does not need to indicate specific resource locations, but the terminal device needs to blindly detect PDCCH in search space which increases detection complexity and time
Solution Approach 1:
The search space is divided into multiple candidate PDCCH locations, and the DCI format is segmented to include both scheduling information and indication information about the actual PDCCH location. This allows the terminal to systematically search through divided candidates rather than blindly scanning the entire search space.
Solution Approach 2:
The base station preliminarily indicates the actual PDCCH location through the DCI format before the terminal needs to access the scheduled channels. This preliminary indication reduces the terminal's detection time by providing guidance on where to look first.
2Adaptability or versatility
If the base station schedules channels of multiple cells with varying parameters, then resource allocation flexibility is improved, but the complexity of managing and detecting PDCCH increases
Solution Approach 1:
The DCI format is designed to be universal, capable of scheduling channels across multiple cells with different parameters (sub-carrier spaces, cyclic prefixes) through a single standardized structure. The indication information field can point to different PDCCH locations适应 various cell configurations without requiring separate detection procedures.
Solution Approach 2:
The system manages parameter variations across multiple cells by changing the indication information field values in the DCI format rather than changing the fundamental detection structure. This allows the terminal to handle different cell parameters through parameter changes in the indication rather than complex reconfiguration of detection mechanisms.
3Productivity
If multiple scheduling cells share common parameters, then system efficiency is improved, but the ability to schedule cells with different parameters is reduced
Solution Approach 1:
The system dynamically determines which cells share common parameters and which have different parameters based on the scheduling needs. The indication information field can point to PDCCH locations adapted to different parameter sets, allowing the system to be dynamic rather than static in its parameter handling.
Solution Approach 2:
Different cells can have different parameter qualities (common parameters vs. varying parameters) depending on their specific scheduling requirements. The DCI format allows local adaptation by providing indication information that is tailored to the specific cell being scheduled, while maintaining overall system efficiency.
Data Source
AI summary
A wireless communication method includes: receiving, by a terminal device, first downlink control information (DCI) transmitted by a network device, the first DCI being used for scheduling channels of at least two first cells.