RRC_INACTIVE Paging Coordination for Lower UE Energy Use
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Solution Overview
Problem
Current NR RRC_INACTIVE state lacks efficient power-saving mechanisms due to uncoordinated RAN and CN paging cycles, leading to excessive UE energy consumption and reduced battery life, especially when extended DRX cycles are implemented.
Innovation Solution
Implement coordinated RAN and CN paging cycles through shared or joint paging windows, using AMF configuration and UE-indicated DRX cycles to reduce unnecessary monitoring and synchronization efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uncoordinated RAN and CN paging cycles are used in RRC_INACTIVE state, then the system maintains simplicity in implementation, but UE energy consumption increases excessively
Solution Approach 1:
The patent merges RAN paging and CN paging into a coordinated structure where both paging types share the same paging cycle and are transmitted in the same paging occasion. The gNB coordinates with the AMF to ensure that RAN paging and CN paging occur simultaneously, allowing the UE to monitor both paging types in a single wake-up event rather than requiring separate monitoring cycles.
Solution Approach 2:
The paging occasion is designed to serve multiple functions simultaneously - it can carry both RAN paging messages and CN paging messages. The UE monitors a universal paging occasion that may contain either or both types of paging, eliminating the need for separate dedicated monitoring occasions for each paging type and reducing overall monitoring requirements.
2Duration of action of stationary object
If extended DRX cycles beyond 10.24 seconds are implemented, then UE battery life is improved, but synchronization and coordination between RAN and CN becomes more difficult
Solution Approach 1:
The gNB performs preliminary coordination with the AMF before the UE enters extended DRX cycle. The network entities exchange paging cycle configurations and establish a coordinated paging schedule in advance, ensuring that both RAN and CN paging occasions align with the UE's extended wake-up times without requiring complex real-time synchronization during the extended DRX period.
Solution Approach 2:
The gNB acts as an intermediary between the UE and the AMF, managing the coordination of paging cycles. The gNB receives paging cycle indications from the AMF and translates them into coordinated RAN paging configurations that align with CN paging, simplifying the synchronization burden for both the UE and the core network during extended DRX operation.
3Reliability
If separate RAN and CN paging monitoring is required, then paging reliability is improved, but the number of paging occasions to monitor increases
Solution Approach 1:
The patent combines RAN paging and CN paging monitoring into a single unified paging occasion. Both types of paging messages are transmitted in the same time-frequency resources, allowing the UE to monitor both paging types simultaneously in one wake-up event rather than requiring separate monitoring occasions, thus maintaining reliability while improving power efficiency.
Data Source
AI summary
Methods and apparatuses for receiving, and controlling the reception of, transmissions at a wireless device. A method performed by a base station comprises deriving a paging cycle for the wireless device, wherein the paging cycle controls the listening of the wireless device to a downlink channel for transmission from the base station or a core network. The method further comprises initiating transmission of an indication relating to the paging cycle to the wireless device.