Inactive UE Small Data Transmission Feedback Mechanism
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Solution Overview
Problem
In wireless communications, user equipment (UE) in an inactive state is unable to successfully transmit uplink data messages to a base station, leading to a lack of information for improving subsequent transmissions, which hampers quality of service (QoS) guarantees.
Innovation Solution
The UE is configured to report self-organizing network (SON) or minimization of drive test (MDT) data, including various parameters related to uplink data message transmissions, even when in an inactive state, using either a random access channel (RACH)-based or configured grant (CG)-based communications procedure, allowing the base station to improve subsequent transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits uplink data messages while in an inactive state, then data transmission capability is improved, but transmission reliability deteriorates due to lack of feedback information
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports transmission parameters and statistics (such as RACH procedure outcomes, configured grant transmission results, radio quality measurements) back to the base station even while in inactive state. This feedback enables the base station to adjust network configuration parameters and improve subsequent transmission reliability, resolving the contradiction by maintaining information flow without requiring full connection state.
2Adaptability or versatility
If the UE reports detailed transmission parameters while inactive, then network optimization is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and reports only the most critical transmission parameters and statistics (such as success/failure indicators, radio quality metrics, data volume information) rather than all possible parameters. This selective reporting approach provides sufficient information for network optimization while minimizing signaling overhead, effectively resolving the contradiction between optimization capability and signaling efficiency.
3Reliability
If the UE maintains connection state for reliable transmission, then transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements a dynamic state management approach where the UE can operate in an inactive state for energy efficiency while maintaining the ability to transmit small data packets and report statistics. The network can dynamically adjust configuration parameters based on received reports, providing reliability on-demand rather than maintaining constant connection state, thus resolving the contradiction between reliability and energy consumption.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit an uplink data message to a base station while the UE is in an inactive mode with respect to the base station. The UE may transmit the uplink data message in accordance with a communications procedure, which may be an example of a random access channel (RACH)-based communications procedure or a configured grant (CG)-based communications procedure. The UE may generate a report that includes parameters related to transmission of the uplink data message, which may be used to improve subsequent uplink data message transmissions from the UE, subsequent RACH procedures performed by the UE, or both. The UE may determine which parameters to include in the report based on the communications procedure and whether transmission of the uplink data message was successful. Accordingly, the UE may transmit the report to the base station.