RRC State Preference Signaling for Lower UE Power Consumption
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Solution Overview
Problem
Existing mobile communication systems face challenges in efficiently transitioning user equipment between RRC connected, idle, and inactive modes to minimize power consumption, as the network often lacks sufficient criteria to determine the optimal mode change, leading to wasteful power consumption during transitional periods.
Innovation Solution
User equipment is configured to transmit preference information for RRC idle or inactive states and, upon changing to RRC connected state, send signals to revert to the preferred mode, allowing the network to conditionally release the connection based on predetermined criteria, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the network releases RRC connection to reduce power consumption, then power consumption is reduced, but connection reliability deteriorates
Solution Approach 1:
The network performs preliminary actions by sending conditional RRC release commands with predetermined criteria before the UE actually transitions to idle mode. This allows the network to prepare for potential reconnection scenarios, maintaining reliability while enabling power savings. The conditional release includes criteria that must be met before the connection is fully released, ensuring smooth transitions.
Solution Approach 2:
The patent implements dynamic RRC mode transitions where the UE can flexibly switch between connected and idle modes based on real-time conditions. The conditional release mechanism allows the system to adapt to changing traffic patterns and network conditions, optimizing the balance between power consumption and connection reliability dynamically rather than using static modes.
2Use of energy by moving object
If the UE frequently transitions between RRC modes to reduce power consumption, then power consumption is reduced, but transition time increases
Solution Approach 1:
The conditional RRC release commands are prepared in advance with all necessary criteria and parameters embedded. When conditions are met, the UE can execute the transition immediately without extensive negotiation or setup, significantly reducing transition time. The preliminary configuration includes resume IDs and other parameters needed for quick reconnection.
Solution Approach 2:
The patent enables the UE to skip lengthy RRC connection establishment procedures by using stored context information and conditional release mechanisms. When transitioning from idle to connected mode, the UE can rapidly resume the connection using pre-configured parameters rather than performing full authentication and setup procedures, thus rushing through the transition process efficiently.
3Speed
If the network maintains RRC connection for quick data transmission, then transmission speed is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the RRC connection state based on real-time traffic conditions. During active data transmission, the UE maintains connected mode for high-speed communication. When traffic subsides and predetermined criteria are met, the UE transitions to idle mode to save power. This dynamic adaptation optimizes the trade-off between transmission speed and power consumption.
Solution Approach 2:
The patent changes key parameters such as RRC connection state, monitoring frequency, and power consumption levels based on traffic conditions and predetermined criteria. By adjusting these parameters dynamically, the system achieves high transmission speed when needed while minimizing power consumption during low-activity periods, resolving the contradiction between speed and energy usage.
Data Source
AI summary
A communication control method comprises transmitting, by a user equipment to a network node, first information indicating that the user equipment prefers one of a RRC idle state and a RRC inactive state; and in response to changing a preferred RRC to a RRC connected state, transmitting, by the user equipment to the network node, second information indicating that the user equipment prefers to revert the first information to transition out of the RRC connected state. Also, a user equipment comprises a controller configured to: transmit, to a network node, first information indicating that the user equipment prefers one of a RRC idle state and a RRC inactive state; and in response to changing a preferred RRC state to a RRC connected state, transmit, to the network node, second information indicating that the user equipment prefers to revert the first information to transition out of the RRC connected state.