Cross-Carrier PDCCH Scheduling for Multi-Cell Uplink and Downlink
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink and downlink transmissions and receptions, particularly in next-generation mobile communication systems requiring higher data rates, low latency, and energy efficiency, especially in scenarios involving multiple cells and carrier aggregation.
Innovation Solution
A method and apparatus for uplink and downlink transmissions/receptions in wireless communication systems that involve monitoring a physical downlink control channel (PDCCH) for scheduling data across multiple cells using cross-carrier scheduling, configuring PDCCH candidates based on the number of candidates per aggregation level in each cell, and utilizing DCI for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier scheduling is implemented to schedule data across multiple cells through a single DCI, then data transmission efficiency is improved and resource utilization is optimized, but the complexity of PDCCH blind decoding increases
Solution Approach 1:
The patent segments the PDCCH search space into cell-specific configurations, where each cell has its own search space set with defined aggregation levels and candidate numbers. This segmentation allows the UE to systematically search for PDCCH in organized units corresponding to different cells, making the blind decoding process more manageable despite dealing with multiple cells.
Solution Approach 2:
The patent applies local quality by configuring different numbers of PDCCH candidates and aggregation levels specific to each cell's characteristics. Each cell can have tailored search space parameters optimized for its local conditions, allowing efficient scheduling across heterogeneous cells with different traffic patterns and channel qualities.
2Adaptability or versatility
If the number of PDCCH candidates per aggregation level is increased to improve scheduling flexibility across multiple cells, then adaptability is improved, but the processing complexity and energy consumption increase
Solution Approach 1:
The patent enables dynamic configuration of PDCCH search space parameters through RRC signaling, allowing the network to adaptively adjust the number of candidates and aggregation levels based on current traffic conditions, channel quality, and scheduling requirements. This dynamic adjustment optimizes the balance between scheduling flexibility and UE processing energy consumption.
Solution Approach 2:
The patent changes key parameters such as the number of PDCCH candidates per aggregation level and search space configuration to optimize performance. By adjusting these parameters based on cell-specific conditions and scheduling needs, the system achieves adaptability while controlling UE processing complexity and energy usage.
3Productivity
If carrier aggregation with multiple cells is deployed to increase data rates and capacity, then productivity is improved, but the device complexity and resource management difficulty increase
Solution Approach 1:
The patent implements a universal PDCCH search space configuration framework that can handle multiple cells with different characteristics through a unified mechanism. The same search space configuration principles and parameters apply across all aggregated cells, providing a multi-functional solution that simplifies resource management despite the increased complexity of carrier aggregation.
Data Source
AI summary
Disclosed are a method and device for uplink transmission or downlink reception in a wireless communication system. A method for a terminal to perform uplink transmission or downlink reception according to an embodiment of the present disclosure comprises the steps of: monitoring a PDCCH in a search space set configured for a first cell, the PDCCH including first DCI for scheduling the uplink transmission or the downlink reception in at least one among the first cell or a second cell; and performing the uplink transmission or the downlink reception in at least one among the first cell or the second cell on the basis of the first DCI.