Power-Saving Signaling for DRX Wake-Up and PDCCH Monitoring
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing energy efficiency, particularly for UEs in RRC_connected mode, where control channel monitoring consumes significant power without data transmission, and group-specific signaling is not always feasible due to high cell load, leading to increased power consumption and system overhead.
Innovation Solution
Implementing control channel signaling mechanisms where a group of UEs monitors a common channel resource, with UE-specific information grouped or multiplexed, and adapting DRX configuration parameters to trigger sleep or wake-up behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a group of UEs monitors a common channel resource, then control channel blocking probability is reduced and system overhead is minimized, but UE-specific control information cannot be individually optimized leading to increased power consumption
Solution Approach 1:
The patent segments control information into group-common information and UE-specific information. Group-common information is transmitted on common PDCCH resources shared by multiple UEs, while UE-specific information is transmitted on UE-specific PDCCH resources. This segmentation allows the system to benefit from resource sharing for common information while providing individualized resources for UE-specific control, thereby reducing control channel blocking probability and optimizing power consumption through targeted wake-up signals.
Solution Approach 2:
The patent implements dynamic DRX configuration where DRX parameters such as cycle length, on-duration, and offset are adaptively adjusted based on UE activity patterns and network conditions. The network can dynamically modify these parameters to optimize the balance between power saving and control channel monitoring efficiency, allowing UEs to transition between active and sleep states more effectively while maintaining reliable control channel reception.
2Use of energy by moving object
If UE-specific control channel resources are assigned, then power consumption can be optimized through individualized monitoring, but control channel blocking increases and system overhead increases when cell load is high
Solution Approach 1:
The patent creates a multi-functional control channel structure where common PDCCH resources serve multiple UEs for group-common information, reducing individual UE-specific resource requirements. This universal approach allows the same time-frequency resources to be shared by multiple UEs for common control information, thereby reducing control channel blocking probability and system overhead while maintaining power saving benefits through coordinated monitoring patterns.
Solution Approach 2:
The patent dynamically changes DRX parameters including cycle length, on-duration timer, and offset based on network load and UE activity. When cell load is high, the system adjusts parameters to reduce the number of UEs requiring simultaneous UE-specific monitoring, thereby reducing control channel blocking while maintaining power efficiency. This parameter adaptation allows the system to optimize the trade-off between individualized power management and system-wide resource utilization.
3Speed
If control channel monitoring is performed continuously in RRC_connected mode, then data transmission can be quickly detected, but power consumption increases significantly when no data is expected
Solution Approach 1:
The patent implements periodic DRX cycles where UEs alternate between active monitoring periods and sleep periods. During on-duration, UEs monitor PDCCH for data transmissions; during off-duration, UEs enter sleep mode to conserve power. This periodic action allows the system to maintain quick data detection capability during active periods while significantly reducing power consumption during idle periods, eliminating the need for continuous monitoring.
Solution Approach 2:
The patent uses wake-up signals transmitted before the actual data transmission to preliminarily notify UEs of upcoming data arrivals. When a UE detects a wake-up signal, it activates its receiver in advance; otherwise, it remains in sleep mode. This preliminary action enables the system to maintain fast data detection readiness only when necessary, significantly reducing power consumption during periods when no data is expected while preserving quick response capability when data is imminent.
Data Source
AI summary
Systems, Methods, Devices, and Apparatuses for power saving are provided. In at least one embodiment, a device may be configured for discontinuous reception (DRX) mode and further receive signaling indicating whether or not to wake and/or may receiving signaling indicating whether or not to go-to-sleep. The signaling may be implemented as group-specific signaling.