PDCCH Time-Domain Allocation for Lower Monitoring Complexity
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Solution Overview
Problem
In the NR system with increased subcarrier spacing, the complexity of PDCCH monitoring for terminal devices is heightened due to shorter slot durations, leading to insufficient PDCCH monitoring capacity and increased frequency, which limits the number of users that can be served effectively.
Innovation Solution
The method involves configuring different time domain resources for different terminal devices to transmit PDCCHs, allowing devices to monitor PDCCHs on a portion of the allocated resources, thereby reducing complexity and increasing the number of users that can be served without overwhelming the terminal device's monitoring capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the subcarrier spacing is increased to reduce data demodulation delay, then the maximum quantity of FFT points is increased, but the slot duration is significantly shortened, leading to increased PDCCH monitoring frequency and complexity
Solution Approach 1:
The patent divides the PDCCH monitoring task into segments by introducing multi-slot monitoring, where the terminal monitors PDCCH across multiple slots within a monitoring periodicity. This segmentation distributes the monitoring burden over time, reducing the instantaneous monitoring frequency and complexity while maintaining the benefits of larger subcarrier spacing for reduced latency.
2Device complexity
If multi-slot monitoring is implemented to increase the monitoring interval, then the monitoring frequency is reduced, but the quantity of PDCCHs that can be monitored is limited, insufficient to serve enough users
Solution Approach 1:
The patent employs dynamic resource allocation where the network device can flexibly configure the quantity of slots for monitoring within each periodicity based on traffic conditions and user demands. This dynamic adjustment allows the system to optimize between monitoring complexity and user service capacity, enabling sufficient users to be served while keeping terminal complexity manageable.
3Productivity
If the quantity of PDCCHs is increased to serve more users, then the number of users that can be served is increased, but the complexity of PDCCH monitoring for the terminal device is increased
Solution Approach 1:
The patent introduces a new dimension of time by utilizing multi-slot monitoring within a periodicity structure. Instead of increasing monitoring within a single slot, the system distributes monitoring across multiple slots in the time domain, allowing more PDCCHs to be monitored without proportionally increasing the complexity within any single monitoring instance.
Data Source
AI summary
A physical downlink control channel transmission method and a related apparatus are provided. The transmission method includes: A network device sends a resource configuration, where the resource configuration indicates a time domain resource used by the network device for PDCCH sending. The network device sends a PDCCH of a first terminal device on a first time domain resource in the time domain resource used by the network device for PDCCH sending, and sends a PDCCH of a second terminal device on a second time domain resource in the time domain resource used by the network device for PDCCH sending. In this way, a terminal device needs to monitor a PDCCH only on a portion of the time domain resource used for PDCCH sending and an increase in complexity of PDCCH monitoring of the terminal device may be avoided.