Two-Step DCI Resource Mapping for 5G Terminal Scheduling
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Solution Overview
Problem
Existing two-step DCI methods in 5G communication systems face challenges in efficiently identifying the resource for the second DCI without increasing the code length of the first DCI, complicating processing, and causing interference with other terminal resources.
Innovation Solution
The method involves determining the resource for the second DCI based on information implicitly indicated in the first DCI, using aggregation levels, coding rates, or modulation and coding schemes, allowing terminals to efficiently identify the second DCI without additional information in the first DCI, thus preventing code length increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resource for the second DCI is explicitly indicated in the first DCI, then the terminal can accurately identify the second DCI resource, but the code length of the first DCI increases
Solution Approach 1:
The patent uses aggregation level information as an intermediary parameter to indirectly determine the second DCI resource. Instead of directly indicating the resource in the first DCI, the system uses the aggregation level (which is already present in the first DCI for PDCCH transmission) as a mediator to calculate the second DCI resource through predefined mapping relationships, thus avoiding direct indication while maintaining accuracy
Solution Approach 2:
The patent changes the parameter used for resource indication from direct resource fields to aggregation level fields. By transforming the resource indication mechanism into using aggregation level information (which is already transmitted for PDCCH), the system achieves resource identification without increasing the code length of the first DCI
2Measurement precision
If additional information is added to the first DCI to indicate the second DCI resource, then the terminal can identify the resource, but the processing complexity increases
Solution Approach 1:
The first DCI uses its own existing aggregation level information to determine the second DCI resource through self-service calculation. The system leverages the aggregation level that is already present in the first DCI for PDCCH transmission and uses it to calculate the second DCI resource according to predefined mapping relationships, eliminating the need for additional information and reducing processing complexity
3Ease of manufacture
If the second DCI resource is determined using a fixed algorithm, then the implementation is simple, but it may cause interference with other terminal resources
Solution Approach 1:
The patent makes the second DCI resource determination dynamic by using aggregation level information that varies with transmission conditions. Instead of a fixed algorithm, the system dynamically calculates the second DCI resource based on the actual aggregation level used in the first DCI transmission, allowing adaptive resource allocation that avoids interference with other terminals while maintaining implementation simplicity through predefined mapping relationships
Data Source
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AI summary
A terminal is disclosed, which is capable of appropriately determining a resource to which a DCI is mapped. A DCI receiver (203) receives first and second downlink (DL) control signals, and a signal demultiplexer (202) demultiplexes a DL data signal from a received signal, using the first and the second DL control signals. The DCI receiver (203) identifies a resource for the second DL control signal based on information on the first DL control signal, or information on the DL data signal, indicated by the first DL control signal.