UE Data Transmission in RRC Inactive State for Small Packets
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Solution Overview
Problem
In New Radio (NR) scenarios, data transmission is not supported in the Radio Resource Control (RRC) Inactive state, which is unsuitable for services with irregular data arrival and varying packet sizes, and small data packets like heartbeat packets or health monitoring data.
Innovation Solution
User Equipment (UE) receives configuration information from the network side device indicating which logical channels and data radio bearers (DRBs) support data transmission in the RRC inactive state, allowing data transmission when supported, and initiates an RRC resume procedure if not supported, with threshold-based decisions for multiplexing data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data transmission is not supported in RRC Inactive state, then power consumption is reduced and signaling overhead is minimized, but service adaptability for diverse data transmission scenarios is degraded
Solution Approach 1:
The patent applies local quality by enabling data transmission functionality specifically in the RRC Inactive state for certain logical channels and DRBs, rather than universally enabling or disabling it across all channels. The network configures specific logical channels and DRBs with indicators that determine whether they support data transmission in inactive state, allowing selective activation based on service requirements while maintaining power efficiency for other channels.
Solution Approach 2:
The patent implements dynamics by allowing the UE to dynamically transition between RRC Inactive and RRC Connected states based on data transmission needs. When data needs to be transmitted and the logical channel/DRB supports inactive state transmission, the UE can remain in Inactive state; otherwise, it dynamically resumes to Connected state, making the system adaptable to varying service requirements in real-time.
2Adaptability or versatility
If data transmission is enabled in RRC Inactive state, then service adaptability is improved, but device complexity increases due to additional configuration management
Solution Approach 1:
The patent applies segmentation by dividing the data transmission functionality into separate logical channels and DRBs, each with independent configuration indicators. This allows the network to selectively enable data transmission in inactive state for specific channels based on service requirements, rather than managing all channels uniformly, thereby reducing overall configuration complexity while maintaining service adaptability.
Solution Approach 2:
The patent implements preliminary action by having the network pre-configure the UE with indicators during RRC connection establishment or reconfiguration, specifying which logical channels and DRBs support data transmission in inactive state. This advance configuration eliminates the need for complex runtime decisions and simplifies UE processing during actual data transmission scenarios.
3Productivity
If threshold-based multiplexing is implemented, then productivity for small data transmission is improved, but device complexity increases due to threshold comparison and decision logic
Solution Approach 1:
The patent applies parameter changes by introducing threshold parameters (first threshold and second threshold) that control the multiplexing behavior. The UE compares data volume against these thresholds to determine whether to multiplex data across multiple logical channels or transmit separately, enabling efficient small data transmission while keeping the decision logic simple and parameter-driven rather than complex algorithmic.
Data Source
AI summary
The present disclosure discloses a method and device for transmitting and receiving data in an inactive state, and user equipment (UE). The method comprises: UE receiving configuration information from a network side apparatus, the configuration information being used to indicate whether at least one of at least one logical channel and a DRB of the UE supports data transmission in a radio resource control (RRC) inactive state; when the configuration information indicates that the at least one logical channel supports the data transmission in the RRC inactive state, the UE transmitting data to be transmitted of the at least one logical channel; and when the configuration information indicates that the DRB supports the data transmission in the RRC inactive state, transmitting data to be transmitted on a logical channel associated with the DRB.