Wireless Node PDCCH Blind Detection Optimization
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Solution Overview
Problem
The use of a wider subcarrier spacing in NR systems shortens OFDM symbol and slot lengths, leading to increased complexity and energy consumption for UE blind detection of PDCCH, which is not conducive to cost and energy efficiency.
Innovation Solution
A method in a first node for wireless communications that involves receiving information blocks to indicate control channel candidate sets and monitoring Q1 control channel candidates within a first time window, where the time-frequency resources are allocated to optimize the monitoring capability and reduce complexity and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wider subcarrier spacing is used to support larger bandwidth and resist phase noise, then the system can operate at higher frequencies (52.6 GHz and 71 GHz), but the OFDM symbol length and slot length become shorter, requiring the UE to perform PDCCH blind detections more quickly and frequently, which increases UE implementation complexity and energy consumption
Solution Approach 1:
The patent introduces dynamic monitoring configurations where the network can configure different monitoring occasions, time windows, and maximum monitoring numbers based on actual channel conditions and traffic requirements. This allows the system to adapt the monitoring intensity dynamically rather than using a fixed high-rate monitoring approach, thereby reducing UE complexity while maintaining high-frequency operation capability
Solution Approach 2:
The patent changes key parameters such as monitoring time window length, maximum monitoring number, and search space set configurations to optimize the balance between detection performance and UE complexity. By adjusting these parameters according to different scenarios, the system can maintain adaptability to high frequencies while controlling UE implementation complexity
2Adaptability or versatility
If a wider subcarrier spacing is used to support larger bandwidth and resist phase noise, then the system can operate at higher frequencies (52.6 GHz and 71 GHz), but the OFDM symbol length and slot length become shorter, requiring the UE to perform PDCCH blind detections more quickly and frequently, which increases energy consumption
Solution Approach 1:
The patent implements periodic monitoring patterns where the UE monitors PDCCH candidates at specific periodic intervals rather than continuously. The network configures monitoring occasions that occur periodically within time windows, allowing the UE to enter low-power states between monitoring periods while still detecting control channels effectively, thus reducing overall energy consumption
Solution Approach 2:
The patent enables the UE to autonomously manage its monitoring behavior based on configured parameters and detected conditions. The UE can determine when to perform blind detections and when to reduce monitoring activity based on the configured maximum monitoring number and time window parameters, reducing energy consumption through intelligent self-management of monitoring resources
3Adaptability or versatility
If the UE performs PDCCH blind detections more frequently to support wider subcarrier spacing, then higher frequency operation is enabled, but the maximum monitoring number and monitoring capability requirements increase
Solution Approach 1:
The patent segments the monitoring task into multiple search space sets, each with its own monitoring configurations. Instead of requiring the UE to monitor all candidates uniformly, the monitoring capability is divided across multiple search space sets with different priorities and configurations, improving overall monitoring efficiency while supporting wider subcarrier spacing adaptability
Data Source
AI summary
The present disclosure provides a method and device in nodes used for wireless communication. A first node receives a first information block and a second information block, and the first information block and the second information block are respectively used to indicate a first control channel candidate set and a second control channel candidate set; time-frequency resources occupied by the first control channel candidate set belong to a first time-frequency resource set, and time-frequency resources occupied by the second control channel candidate set belong to a second time-frequency resource set; the first node monitors Q1 control channel candidates; wherein a first time-frequency resource set belongs to a first time window in time domain The method of the application is conducive to improving a number of blind detections of a control channel and increasing the flexibility of the blind detection capability allocation.