PDCCH Search Space Detection Tuned to UE Capability
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Solution Overview
Problem
In the context of 5G New Radio Access Technology (NR), there is a lack of sufficient discussion on how user equipment (UE) monitors search spaces for downlink control channels (PDCCH) to detect downlink control indicators (DCI), leading to inefficient use of search space detection capability in existing systems.
Innovation Solution
A method is introduced where the base station and terminal dynamically set and adjust the number of detections in the search space based on factors such as subcarrier spacing, symbol configuration, UE capability, and service category, allowing for flexible and optimized detection of DCI in CORESETs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of detections in search space is increased to improve DCI detection capability, then detection reliability is improved, but terminal processing complexity and power consumption increase
Solution Approach 1:
The patent applies dynamics by making the number of detections variable rather than fixed. The base station dynamically adjusts the number of detections based on terminal capability information, allowing the system to adapt between high reliability modes (more detections) and low complexity modes (fewer detections) depending on terminal capabilities.
Solution Approach 2:
The patent changes the parameter of detection number based on terminal capability. By receiving capability information from terminals and adjusting the detection parameter accordingly, the system optimizes the balance between detection reliability and processing complexity for different terminal types.
2Reliability
If the number of detections in search space is increased to improve DCI detection capability, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts power consumption by varying the detection number based on terminal capability. Terminals with higher power budgets can perform more detections for higher reliability, while power-constrained terminals perform fewer detections to conserve energy.
Solution Approach 2:
The detection parameter is changed according to terminal capability, which directly controls power consumption. By receiving capability information and adjusting the detection parameter, the system enables power-efficient operation for different terminal types.
3Device complexity
If a fixed number of detections is configured for all terminals, then system simplicity is maintained, but adaptability to different terminal capabilities is reduced
Solution Approach 1:
The system performs preliminary action by having terminals report their capability information before actual DCI detection. This advance information exchange enables the base station to configure appropriate detection parameters tailored to each terminal's capabilities.
Solution Approach 2:
The system changes detection parameters based on received capability information. By maintaining a set of configurable detection numbers and selecting appropriate values based on terminal capability, the system achieves adaptability without excessive complexity.
4Productivity
If the maximum number of detections is set per symbol for control channel candidates, then resource utilization is optimized, but detection flexibility is constrained
Solution Approach 1:
The patent applies dynamics by setting the maximum number of detections per symbol as a configurable parameter rather than a fixed constraint. This allows the system to dynamically adjust between efficient resource utilization (stricter limits) and flexible detection configurations (more lenient limits) based on operational requirements.
Data Source
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AI summary
In a base station, a setting unit for setting the number of detections sets at least one search space that includes plural control channel candidates to be targets of detection of a control signal in a terminal, and a transmission unit transmits the control signal that is mapped on any of the plural control channel candidates in the search space. Here, the number of detections in the search space by the terminal is determined based on settings of the terminal.