RRC Inactive Data Transfer via Split Resume Procedures
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Solution Overview
Problem
The transition from RRC_INACTIVE to RRC_CONNECTED state in 5G communication systems involves excessive overhead when there is insufficient data for transmission, reducing network efficiency due to the need for context transfer and data path changes.
Innovation Solution
A method and apparatus for data transfer in the RRC_INACTIVE state, involving a first resume procedure for resuming the RRC connection and a second resume procedure for transmitting and receiving data without transitioning to RRC_CONNECTED, using UECapabilityInformation, RRCRelease messages, and system information with thresholds for reference signal received power and data volume to optimize data transmission.
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 increases due to context transfer and data path changes
Solution Approach 1:
The patent divides the resume procedure into two separate procedures: a first resume procedure for resuming the RRC connection, and a second resume procedure for data transmission. This segmentation allows the data transfer function to be separated from the connection resume function, enabling data transmission to occur without requiring a full state transition to RRC_CONNECTED, thereby reducing the overhead associated with context transfer and data path changes while maintaining data transmission capability.
2Reliability
If the terminal uses the first resume procedure to resume RRC connection, then connection reliability is improved, but transmission latency increases due to full state transition
Solution Approach 1:
The patent introduces dynamic selection between two resume procedures based on data transmission requirements. The terminal can choose the second resume procedure for rapid data transmission when conditions permit, or the first resume procedure when connection reliability is the priority. This dynamic approach allows the system to adapt to different operational scenarios, optimizing the balance between reliability and latency.
Solution Approach 2:
The patent performs preliminary configuration during the first resume procedure by setting up parameters for the second resume procedure, including thresholds for reference signal received power and data volume. These preliminary actions enable the terminal to quickly execute the second resume procedure when conditions are favorable, reducing transmission latency while maintaining reliability through pre-configured parameters.
3Productivity
If the terminal transmits data in RRC_INACTIVE state using second resume procedure, then transmission efficiency is improved, but connection stability may be compromised
Solution Approach 1:
The patent changes key parameters to enable data transmission in RRC_INACTIVE state, including modifying the data transmission threshold and reference signal received power threshold. By adjusting these parameters, the system allows efficient data transmission in the inactive state while maintaining connection stability through controlled parameter changes rather than full state transitions.
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 transmitting a UECapabilityInformation, receiving a RRCRelease, starting a timer with the timer value set to the timerValue1, receiving a system information and initiating a second resume procedure and stopping the timer after restoring a configuration for SRB1 stored in UE Inactive AS (Access Stratum) context. The RRCRelease includes a first information for second resume procedure and a timerValue1, the first information for second resume procedure includes a SRB2(Signaling Radio Bearer2) indicator and a DRB(Data Radio Bearer) list. The system information includes a first threshold and a second threshold, the first threshold is related to a reference signal received power and the second threshold is related to a data volume.