Implicit RRC State Transitions for Cellular Power Optimization
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Solution Overview
Problem
In cellular communication systems, high device densities with infrequent data transmission needs lead to significant signaling burdens and power inefficiencies, particularly in scenarios where explicit RRC connection release mechanisms are used, causing unnecessary power consumption and increased network load.
Innovation Solution
Implementing an implicit radio resource control (RRC) state transition mechanism that allows wireless devices to negotiate and transition to more power-efficient states (RRC idle or inactive) based on device preferences and network conditions, reducing the need for explicit signaling and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit RRC connection release mechanisms are used, then network control and reliability are improved, but signaling burden and power consumption increase
Solution Approach 1:
The network pre-configures the UE with release conditions and target state information before the connection needs to be released. The UE autonomously determines when to release based on these pre-configured parameters, eliminating the need for explicit release signaling while maintaining network control.
Solution Approach 2:
The UE autonomously performs the RRC connection release decision based on pre-configured parameters from the network. This self-service mechanism reduces signaling overhead and power consumption while the network maintains overall control through the initial configuration.
2Reliability
If explicit RRC connection release mechanisms are used, then network control is improved, but network load and signaling burden increase
Solution Approach 1:
The network pre-configures release conditions, target states, and associated parameters before the UE needs to release the connection. This eliminates the need for real-time explicit release signaling, reducing network load while maintaining control through the initial configuration.
Solution Approach 2:
The explicit release signaling step is extracted from the connection management process. Instead of the network sending explicit release messages, the UE autonomously releases based on pre-configured conditions, removing the signaling burden from the network.
3Speed
If RRC connected state is maintained for infrequent data transmission, then data transmission readiness is improved, but power efficiency deteriorates
Solution Approach 1:
The system dynamically transitions between RRC connected and inactive states based on data transmission needs. The UE can quickly transition to inactive state when no data is being transmitted, saving power, while maintaining the ability to quickly resume connected state when data transmission is needed.
Solution Approach 2:
The UE periodically monitors for data transmission opportunities and transitions between states accordingly. Instead of maintaining continuous connected state, the UE uses periodic monitoring and autonomous state transitions to balance power efficiency with transmission readiness.
Data Source
AI summary
This disclosure relates to performing implicit radio resource control state transitions in a cellular communication system. A wireless device may establish a radio resource control (RRC) connection with a cellular base station. A data inactivity timer length and a target RRC state for implicit RRC transitions may be determined. A data inactivity timer having the determined data inactivity timer length may be initiated. It may be determined that the data inactivity timer has expired. The wireless device may transition to the target RRC state based at least in part on determining that the data inactivity timer has expired.