PDCCH Transmission via Segmented Lower Aggregation Levels
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Solution Overview
Problem
Current PDCCH transmission methods at high aggregation levels in mobile communication technologies face challenges such as excessive resource occupation, reduced transmission performance, and congestion, making it difficult to schedule terminals effectively.
Innovation Solution
The method involves sending first indication information to terminal devices to configure repeated transmission of PDCCHs at lower aggregation levels, allowing for combined receiving and reducing the number of consecutive CCEs occupied, thereby expanding applicable scenarios and reducing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PDCCH is sent at a high aggregation level (e.g., AL-16), then the scheduling coverage and reliability are improved, but a large quantity of consecutive CCEs are occupied, causing resource congestion and reducing transmission performance
Solution Approach 1:
The patent divides a high aggregation level PDCCH (e.g., AL-16) into multiple lower aggregation level PDCCHs (e.g., four AL-4 PDCCHs). Each segmented PDCCH occupies fewer consecutive CCEs (4 CCEs each), reducing resource congestion while collectively providing the same scheduling coverage as the original high aggregation level PDCCH.
Solution Approach 2:
The patent introduces a new dimension of transmission by sending multiple PDCCHs at different time-frequency positions instead of a single PDCCH. This dimensional expansion allows the system to achieve high aggregation level coverage through multiple lower aggregation level transmissions distributed across different resources.
2Adaptability or versatility
If a PDCCH at high aggregation level is sent, then the scheduling coverage is expanded, but transmission congestion occurs and performance deteriorates
Solution Approach 1:
The patent segments a high aggregation level PDCCH into multiple lower aggregation level PDCCHs that can be transmitted at different time-frequency positions. This segmentation maintains the scheduling coverage of the original high aggregation level while distributing the transmission load, thereby avoiding congestion and maintaining transmission performance.
Solution Approach 2:
The patent combines multiple lower aggregation level PDCCHs to achieve the effect of a high aggregation level PDCCH. By merging the coverage contributions of multiple AL-4 PDCCHs, the system achieves the same scheduling coverage as AL-16 while avoiding the resource occupation issues.
3Measurement precision
If repeated transmission of PDCCH is implemented, then detection performance is enhanced, but resource occupation increases
Solution Approach 1:
The patent segments repeated transmissions into multiple lower aggregation level PDCCHs instead of repeating a single high aggregation level PDCCH. Each segment occupies fewer resources, but the collective effect of multiple segments provides both repeated transmission diversity and reduced per-transmission resource occupation.
Data Source
AI summary
A physical downlink control channel PDCCH transmission method and apparatus is provided. The method includes: A network device sends first indication information to a terminal device, where the first indication information may include configuration information of a PDCCH, the configuration information of the PDCCH is used to indicate at least one repeated transmission configuration manner, which includes a first repeated transmission configuration manner. The repeated transmission configuration manner includes at least one of a quantity of repetitions of the PDCCH and an aggregation level that is of the PDCCH and that corresponds to the quantity of repetitions. The network device may send the PDCCH to the terminal device based on the first repeated transmission configuration manner. According to this method, a sending effect of a PDCCH at a higher aggregation level can be implemented through repeated sending of a plurality of PDCCHs at lower aggregation levels.