Downlink Control Information Format Configuration for Heterogeneous Duplex Carrier Aggregation
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Solution Overview
Problem
Current mobile communication systems, such as LTE and LTE-Advanced, face challenges in transmitting downlink control information when User Equipment (UE) communicates using component carriers or serving cells with different duplex modes, leading to ambiguity in downlink control information formats.
Innovation Solution
A method and apparatus that configure a downlink control information format based on the duplex mode of one cell for a UE executing Carrier Aggregation (CA), allowing for the transmission and reception of downlink control information across cells with varying duplex modes, including configuring cross-carrier scheduling and using specific DCI formats for FDD and TDD systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a UE executes Carrier Aggregation using component carriers or serving cells with different duplex modes, then data transmission capacity is improved, but ambiguity in downlink control information formats occurs
Solution Approach 1:
The patent applies local quality by configuring different downlink control information formats based on the duplex mode of each specific cell. When a UE is configured with multiple cells having different duplex modes (FDD and TDD), the system selects appropriate DCI formats (e.g., format 1/1A for FDD, format 1/1A/2/2A for TDD) according to the local duplex mode characteristics of each cell, thereby maintaining clear control information transmission while supporting heterogeneous carrier aggregation
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting downlink control information formats based on duplex mode parameters. The system changes the DCI format parameters (such as resource allocation fields, modulation and coding scheme indicators) according to whether the cell operates in FDD or TDD mode, ensuring that control information is transmitted with appropriate parameters for each duplex mode while maintaining overall system capacity
2Device complexity
If downlink control information is transmitted using a unified format across all cells, then device complexity is reduced, but transmission reliability deteriorates in heterogeneous duplex mode networks
Solution Approach 1:
The patent implements local quality by configuring downlink control information formats according to the specific duplex mode of each cell rather than using a unified format. The base station determines the appropriate DCI format based on whether each cell operates in FDD or TDD mode, ensuring that control information transmission parameters match the local characteristics of each cell, thereby maintaining transmission reliability without excessive complexity
Solution Approach 2:
The patent applies dynamics by enabling flexible selection of downlink control information formats based on the duplex mode configuration. The system dynamically adapts the DCI format used for each cell according to its duplex mode, allowing the control information transmission to be optimized for each specific cell's operational characteristics while maintaining overall system coordination
Data Source
AI summary
Provided are a method and a device for transmitting and receiving downlink control information. In particular, a method and device may be provided for configuring a downlink control information transmission format in a carrier aggregation situation among serving cells having different duplex modes. A method of a base station for transmitting downlink control information includes the steps of: configuring a downlink control information format on the basis of the duplex mode of one cell among the plurality of cells configured in a terminal performing Carrier aggregation; and transmitting the downlink control information by using the downlink control information format.