PDCCH Search Space Span Segmentation for UE Processing
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in efficiently configuring and receiving physical downlink control channels (PDCCH) due to limitations in processing capabilities of user equipment (UE), particularly with increasing subcarrier spacing, which affects the flexibility and coverage of PDCCH scheduling.
Innovation Solution
The method involves UE determining the time resource position of the search space based on configured time resource information from the base station, reducing blind detection times for PDCCH, and optimizing the configuration of search spaces to align with predefined thresholds and priorities, thereby managing the complexity and processing burden within UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of PDCCH candidates and non-overlapping CCEs is increased to improve scheduling flexibility and coverage, then the scheduling flexibility and coverage are enhanced, but the processing complexity and power consumption of the UE exceed its capabilities
Solution Approach 1:
The patent segments the search space into multiple spans within a slot, where each span contains a limited number of PDCCH candidates and non-overlapping CCEs. This segmentation allows the UE to process PDCCH monitoring in manageable units rather than attempting to process all candidates simultaneously, thereby reducing processing complexity while maintaining overall scheduling flexibility through the distributed span structure.
Solution Approach 2:
The patent introduces dynamic parameters including span length (Y), interval between spans (X), and the number of spans per slot, which can be configured based on UE capabilities and network requirements. This dynamic configuration allows the system to adapt the PDCCH monitoring structure to match UE processing capabilities while maintaining scheduling flexibility, resolving the contradiction between complexity and adaptability.
2Reliability
If the number of PDCCH candidates and non-overlapping CCEs is increased to enhance coverage, then the coverage is improved, but the power consumption of the UE exceeds its capabilities
Solution Approach 1:
By dividing the search space into multiple spans with controlled numbers of candidates and CCEs per span, the UE can process monitoring tasks in smaller, more energy-efficient units. The segmentation reduces the peak processing load and allows for more efficient power management while maintaining overall coverage through the distributed span structure across the slot.
Solution Approach 2:
The patent changes key parameters including the span length (Y), interval (X), and maximum number of candidates per span to optimize the balance between coverage and power consumption. These parameter adjustments allow the system to reduce the instantaneous processing burden on the UE, thereby lowering power consumption while maintaining adequate coverage through the distributed monitoring structure.
3Productivity
If subcarrier spacing is increased to improve transmission efficiency, then the transmission efficiency is enhanced, but the UE processing capabilities are exceeded
Solution Approach 1:
The patent introduces dynamic configuration of span parameters (X, Y) and the number of spans based on subcarrier spacing and UE capabilities. When subcarrier spacing increases, the system can adjust the span length and interval to maintain an appropriate number of PDCCH candidates per span, ensuring that UE processing complexity remains manageable while preserving transmission efficiency through the adapted span structure.
Solution Approach 2:
The patent adjusts multiple parameters including span length, interval between spans, and the number of PDCCH candidates per span in response to changes in subcarrier spacing. These parameter changes allow the system to maintain transmission efficiency at higher subcarrier spacings while keeping UE processing complexity within acceptable limits by distributing the monitoring load across multiple smaller spans.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The application discloses a method of receiving physical downlink control channel and corresponding equipment. According to an aspect of the application, there is provided a method performed by user equipment (UE) in a communication system, including: receiving, by the UE, time resource information of a search space configured by a base station; determining, by the UE, the time resource position of the search space according to the time resource information of the search space configured by the base station; determining, by the UE, the times of blind detection for a physical downlink control channel (PDCCH)/a number of non-overlapping control channel elements (CCE) in the search space.