RRC Inactive Data Transfer via Dual Resume Procedures
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Solution Overview
Problem
The transition from RRC_INACTIVE to RRC_CONNECTED state in 5G mobile communication systems is inefficient due to excessive overhead when data transfer is not justified, impacting network efficiency.
Innovation Solution
A method and apparatus for data transfer in the RRC_INACTIVE state, involving a first resume procedure to resume the suspended RRC connection and a second resume procedure to transmit and receive data without transitioning to RRC_CONNECTED, utilizing specific configurations and security key management to optimize data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal transitions from RRC_INACTIVE to RRC_CONNECTED state for data transfer, then data transmission capability is improved, but network overhead and state transition complexity increase
Solution Approach 1:
The patent segments the traditional binary state transition (RRC_INACTIVE to RRC_CONNECTED) by introducing a new state RRC_INACTIVE with data transfer capability. This creates three distinct operational states, allowing the terminal to remain in RRC_INACTIVE for small data transfers while only transitioning to RRC_CONNECTED for large data transfers, thereby reducing unnecessary state transitions and overhead.
Solution Approach 2:
The patent enables partial data transfer functionality within the RRC_INACTIVE state without requiring full RRC_CONNECTED establishment. By allowing limited data transmission in the inactive state and only fully transitioning to connected state when necessary, the system performs just enough action to satisfy the data transfer requirement while avoiding excessive state transitions.
2Reliability
If the terminal performs full RRC_CONNECTED state establishment for data transfer, then data transfer reliability is improved, but network overhead and latency increase
Solution Approach 1:
The patent performs preliminary configuration of data transfer parameters, security context, and resource allocation while the terminal is in RRC_INACTIVE state. The network pre-allocates resources and configures data transfer parameters before actual data transfer begins, so when data transfer is needed, the terminal can immediately use the pre-configured settings without undergoing full RRC_CONNECTED establishment, thereby reducing latency while maintaining reliability.
3Loss of energy
If the terminal remains in RRC_INACTIVE state for data transfer, then network overhead is reduced, but data transfer capability and reliability may be insufficient
Solution Approach 1:
The patent makes the data transfer capability dynamic by allowing the terminal to adapt its operational mode based on data transfer requirements. For small data transfers, the terminal operates in RRC_INACTIVE with reduced overhead, while for large data transfers, it dynamically transitions to RRC_CONNECTED for full capability. This dynamic adaptation optimizes the balance between overhead reduction and data transfer capability based on real-time needs.
Data Source
AI summary
A method and apparatus for data transfer in RRC_INACTIVE state is provided. Method for data transfer in RRC_INACTIVE state includes receiving RRC Reconfiguration message, receiving RRC Release message and triggering BSR based on the first configuration or based on the second configuration.