PDCCH and R-PDCCH Allocation for Lower DCI False Alarms
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Solution Overview
Problem
The increasing number of wireless communication terminals and heterogeneous networks leads to insufficient PDCCH resources, interference, and increased blind decoding operations, resulting in lower system throughput and higher false alarm rates.
Innovation Solution
A base station configures both PDCCH and R-PDCCH regions for DCI transmission, with controlled blind decoding operations, using a common DCI format to reduce errors and interference, and optimizes search spaces to minimize false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of wireless communication terminals increases and heterogeneous networks are deployed, then network coverage and capacity are improved, but PDCCH resources become insufficient and interference increases
Solution Approach 1:
The patent divides the control channel resources into two separate regions: PDCCH region for traditional control information and R-PDCCH region for relay and enhanced control information. This segmentation allows independent optimization of each region's resource allocation and reduces interference between different control information types, thereby improving overall resource utilization in heterogeneous networks
Solution Approach 2:
The patent introduces a new dimension for control channel allocation by defining R-PDCCH in the data region (PDSCH) rather than solely in the traditional control region. This dimensional change enables more flexible resource allocation and increases the available control channel resources without conflicting with traditional PDCCH operations
2Adaptability or versatility
If multiple DCI formats are transmitted to support different allocation methods, then adaptability is improved, but the number of blind decoding operations increases
Solution Approach 1:
The patent extracts and separates the control information for different allocation methods into distinct DCI formats that are transmitted in different regions (PDCCH vs. R-PDCCH). This extraction allows the terminal to focus blind decoding efforts on specific regions based on the allocated search spaces, reducing the overall number of blind decoding operations required while maintaining support for multiple allocation formats
Solution Approach 2:
The patent introduces search space configuration as an intermediary mechanism that guides the terminal's blind decoding process. By defining specific search spaces in different regions for different DCI formats, the system mediates between the need for multiple formats and the terminal's decoding capacity, optimizing the balance between adaptability and complexity
3Quantity of substance
If PDCCH region size is increased to accommodate more terminals, then resource allocation capacity is improved, but system throughput decreases due to reduced data region
Solution Approach 1:
The patent moves part of the control channel functionality to the data region by introducing R-PDCCH in the PDSCH area. This dimensional shift allows the traditional PDCCH region to remain compact (preserving data transmission capacity) while still providing adequate control resources through the additional R-PDCCH region in the data area, thus maintaining system throughput
4Measurement precision
If blind decoding operations are increased to detect DCI for multiple formats, then detection accuracy is improved, but power consumption and processing delay increase
Solution Approach 1:
The patent extracts and separates the blind decoding targets into different regional search spaces (PDCCH search space and R-PDCCH search space). This extraction allows terminals to efficiently manage their blind decoding operations by focusing on region-specific search spaces rather than uniformly searching all possible locations, thereby reducing overall power consumption while maintaining detection accuracy through targeted decoding efforts
Data Source
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AI summary
Provided are a base station, whereby the erroneous dete ction of control information can be reduced, thereby preventin g the degradation of the system throughput. A base station ( 100) maps a downstream allocation control information unit, which is addressed to a terminal (200), to a first resource re gion, which can be used for any of a downstream control cha nnel region and a downstream data channel region, or to a se cond resource region, which can be used only for the downstr earn control channel, so as to transmit the downstream allocat ion control information unit. In the base station (100), a co ntrol unit (102) establishes a scale of the PDCCH region, and a transmission region establishing unit (131) establishes, on the basis of a scale value established by the control unit (10 2), a mapping region to which the DCI is mapped within the R-PDCCH region and the PDCCH region.