Adaptive PDCCH Monitoring for 5G Power Saving and Reliable Reception
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Solution Overview
Problem
Existing 5G wireless technologies face challenges in optimizing power consumption during connected mode discontinuous reception (c-DRX) due to inefficient PDCCH search space monitoring, leading to suboptimal power savings.
Innovation Solution
A unified signaling technique for adaptive PDCCH search space monitoring is introduced, allowing for switching and/or skipping configurations based on traffic density, using RRC signaling and DCI to minimize overhead, and employing timer-based approaches to adjust PDCCH monitoring configurations without additional signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH search space monitoring is performed frequently to ensure reliable data reception, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the PDCCH monitoring behavior adaptive rather than static. The UE dynamically switches between different monitoring configurations (first configuration with shorter periodicity and second configuration with longer periodicity) based on traffic conditions. This allows the system to optimize between reliability and power consumption by adjusting monitoring frequency according to actual data arrival patterns, rather than using a fixed monitoring schedule.
Solution Approach 2:
The patent changes the monitoring periodicity parameter based on traffic density indicators. When traffic density is high, the UE uses the first configuration with shorter monitoring periodicity to ensure reliable reception. When traffic density is low, the UE switches to the second configuration with longer periodicity to reduce power consumption. This parameter adaptation resolves the contradiction by adjusting the monitoring frequency to match actual network conditions.
2Use of energy by moving object
If PDCCH monitoring periodicity is reduced to save power, then power consumption decreases, but data reception reliability deteriorates
Solution Approach 1:
The system dynamically adjusts monitoring periodicity based on traffic conditions rather than using a fixed low-periodicity schedule. The UE monitors traffic density indicators and switches between configurations accordingly, ensuring that when data arrives frequently, the UE transitions to more frequent monitoring to maintain reliability, while allowing extended intervals during low-traffic periods to save power.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors traffic density indicators from the network and uses this feedback to adjust its monitoring configuration. The network provides indicators about data arrival patterns, and the UE uses this feedback to switch between monitoring configurations, ensuring reliability is maintained when needed while enabling power savings when traffic is light.
3Use of energy by moving object
If adaptive monitoring configurations are implemented to optimize power savings, then power consumption decreases, but device complexity increases
Solution Approach 1:
The patent segments the monitoring configuration into distinct, pre-defined options (first configuration and second configuration) with different periodicities. Rather than requiring continuous adjustment of monitoring parameters, the UE switches between these segmented configurations based on traffic conditions. This segmentation simplifies the implementation complexity while still enabling adaptive power optimization.
Solution Approach 2:
The patent uses periodic action by defining monitoring configurations with specific periodicities. The UE alternates between a first periodic configuration (shorter period) and a second periodic configuration (longer period) based on traffic density. This periodic structure provides a simple, rule-based mechanism for adaptation that reduces complexity compared to continuous parameter adjustment, while still achieving significant power savings during low-traffic periods.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide adaptive physical downlink control channel (PDCCH) monitoring. In particular, a unified signaling technique for adaptive PDCCH search space monitoring is descried. This signaling can indicate either one or a combination of the switching and skipping. In an example, the signaling includes multiple parts. In a first part, radio resource control (RRC) signaling is sent from the network to the device to configure the device for switching only, skipping only, or switching and skipping. In a second part, first DCI is sent from the network to the device to indicate the particular PDCCH monitoring configuration to use for the PDCCH search space monitoring. Thereafter, network sends second DCI in the relevant PDCCH search space, where this second DCI schedules traffic. The device performs blind decoding to determine the second DCI in order to exchange the traffic.