User Equipment PDCCH Search Space Detection Control
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Solution Overview
Problem
User equipment in 5G NR systems faces challenges in properly determining the PDCCH search space, which is crucial for obtaining system information, and this can lead to issues such as accessing a proper base station being hindered by fake base stations or improper MIBs.
Innovation Solution
The user equipment is equipped with a reception unit to receive system information in specific frequency blocks and a control unit that determines the existence of a PDCCH search space based on parameter values from the received information, stopping detection of synchronization signals in certain conditions to prevent workload overload and ensure proper access to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment continuously detects synchronization signals to ensure proper base station access, then access reliability is improved, but detection time and energy consumption increase
Solution Approach 1:
The patent applies preliminary anti-action by using system information (specifically a parameter in the MIB or SIB) to preemptively identify and mark frequency blocks that contain fake base stations or improper MIBs. This allows the UE to prevent unnecessary synchronization signal detection in these blocks before time is wasted, thereby maintaining access reliability while reducing detection time.
Solution Approach 2:
The patent implements preliminary action by having the UE first obtain and analyze system information from frequency blocks before attempting synchronization signal detection. By preliminarily identifying valid frequency blocks through system information parameters, the UE prepares a list of candidate blocks for synchronization detection, ensuring that detection efforts are focused only on legitimate base stations.
2Reliability
If user equipment detects synchronization signals in all frequency blocks to ensure comprehensive coverage, then access reliability is improved, but device complexity and processing workload increase
Solution Approach 1:
The patent applies segmentation by dividing the frequency blocks into two categories: valid frequency blocks identified through system information parameters, and invalid blocks marked as containing fake base stations or improper MIBs. This segmentation allows the UE to process only the relevant subset of frequency blocks for synchronization detection, reducing processing complexity while maintaining comprehensive coverage of legitimate base stations.
Solution Approach 2:
The patent extracts and removes invalid frequency blocks from the detection process by using system information parameters to identify and exclude blocks with fake base stations or improper MIBs. This extraction principle reduces the set of frequency blocks that require synchronization signal detection, thereby reducing device complexity and processing workload while preserving access reliability.
3Reliability
If user equipment obtains system information from multiple frequency blocks to improve access reliability, then base station access reliability is improved, but loss of time increases
Solution Approach 1:
The patent applies dynamics by making the frequency block selection process adaptive based on system information parameters. The UE dynamically determines which frequency blocks to acquire system information from and which to skip, based on parameters received during initial access. This dynamic approach allows the UE to efficiently acquire necessary system information while avoiding time-consuming acquisitions from invalid blocks.
Data Source
AI summary
In one aspect of the present invention, user equipment includes a reception unit configured to receive first system information in a frequency block where a synchronization signal is placed and third system information in another frequency block; and a control unit configured to stop detecting the synchronization signal, (1) based on a parameter value determined from the first system information, (1-1) when a control channel search space for receiving second system information does not exist and (1-2) when the parameter value is within a predetermined range and (2) when the control channel search space for receiving the second system information does not exist based on a parameter value determined from the third system information.