RRC State Management via Dual Timer Failure Detection
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Solution Overview
Problem
In wireless communication systems, especially in the RRC inactive state, small data transmission faces challenges due to high signaling overhead and increased UE power consumption, necessitating a mechanism for failure detection to prevent interruptions during system congestion or link failures.
Innovation Solution
The introduction of two new timers to detect failure in small data transmission procedures, where the state of both timers determines whether to switch RRC states, preventing premature transitions and maintaining network and UE consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If small data transmission is performed in RRC inactive state, then signaling overhead is reduced, but transmission reliability deteriorates due to system congestion or link failure
Solution Approach 1:
The patent implements a feedback mechanism where the network side sends acknowledgment indications to the UE about the transmission status of small data in RRC inactive state. When transmission failure is detected, the network can trigger RRC state transition or retransmission, ensuring reliable delivery while maintaining low signaling overhead for successful transmissions.
Solution Approach 2:
The patent establishes preliminary failure detection mechanisms by configuring timers and thresholds before transmission occurs. The network side proactively monitors transmission status and prepares failure recovery actions in advance, allowing quick response to transmission failures without waiting for explicit error reports from the UE.
2Reliability
If RRC state transition is performed for small data transmission, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic RRC state management where the UE can transition between RRC inactive and RRC connected states based on transmission needs and network conditions. Small data transmissions are performed in RRC inactive state to save power, while full RRC connected state is activated only when necessary for reliable transmission or large data transfers, optimizing the trade-off between reliability and power consumption.
3Reliability
If failure detection mechanism is implemented, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements self-service failure detection where the network side autonomously monitors transmission status using configured timers and thresholds without requiring additional signaling from the UE. The network independently determines transmission success or failure and triggers appropriate recovery actions, reducing system complexity while maintaining high reliability.
Data Source
AI summary
Discloses a method and a device for wireless communications. A first node maintains a first timer, and maintains a second timer; transmits a first message, the first message comprising an RRC signaling; and determines whether to switch an RRC state according to both a state of the first timer and a state of the second timer; herein, the action of maintaining a first timer comprises: along with the first message, starting the first timer; the action of determining whether to switch an RRC state according to both a state of the first timer and a state of the second timer comprises: when the second timer is not in a running state, as a response to that the first timer is expired, switching from an RRC inactive state to a first RRC state. The present application implements the failure detection of small data transmission.