Small Data Transmission Selection in RRC_INACTIVE Mobility
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Solution Overview
Problem
In the NR RRC_INACTIVE state, small and infrequent data transmissions result in unnecessary power consumption and signaling overhead due to the need for connection setup and release for each data packet, which is inefficient and not supported by existing technologies.
Innovation Solution
A device and method that determine a mobility metric to select between a small data transmission (SDT) procedure and a connection establishment procedure, considering factors like beam and cell changes, to optimize data transmission in the RRC_INACTIVE state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection establishment procedure is performed for each small data packet in RRC_INACTIVE state, then data transmission can be achieved, but power consumption and signaling overhead increase unnecessarily
Solution Approach 1:
The network pre-configures SDT resources (uplink grants, physical resources) for UEs in RRC_INACTIVE state before data transmission occurs. This allows UEs to transmit small data packets immediately using pre-allocated resources without performing full connection establishment, thereby reducing power consumption while maintaining transmission capability.
Solution Approach 2:
The system dynamically selects between SDT and connection establishment procedures based on data transmission requirements. For small infrequent packets, SDT is used; for larger or more frequent data, connection establishment is performed. This dynamic adaptation optimizes power consumption based on actual traffic patterns.
2Reliability
If connection establishment procedure is performed for each small data packet in RRC_INACTIVE state, then data transmission can be achieved, but signaling overhead increases
Solution Approach 1:
The network pre-configures SDT resources including physical uplink resources and transmission parameters before the UE needs to transmit data. This preliminary configuration eliminates the need for extensive signaling exchanges during actual data transmission, reducing signaling overhead while ensuring reliable data transmission.
Solution Approach 2:
The patent extracts the essential data transmission function from the full connection establishment procedure by creating a simplified SDT mechanism. This extracted mechanism handles only small data packets in inactive state, separating this specific function from the complete connection setup process and thereby reducing signaling overhead.
3Use of energy by moving object
If SDT procedure is used for data transmission in RRC_INACTIVE state, then power consumption and signaling overhead are reduced, but mobility handling becomes challenging
Solution Approach 1:
The system implements feedback mechanisms where UEs report mobility status (cell changes, beam changes) to the network. Based on this feedback, the network adjusts SDT resource allocation and configuration, ensuring that SDT continues to function effectively even when UEs are moving, thus maintaining adaptability while keeping power consumption low.
Solution Approach 2:
The SDT configuration is made dynamic and adaptable to mobility conditions. The network can update SDT parameters, reconfigure resources, or trigger connection establishment based on real-time mobility assessments. This dynamic adaptation allows the system to maintain low power consumption for stationary or slow-moving UEs while handling mobility requirements when necessary.
Data Source
AI summary
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media for configuration of small data transmission. In example embodiments, a metric of mobility is determined in an inactive state. Based on the metric of mobility, one of a small data transmission procedure and a connection establishment procedure is selected for data transmission. Further, the selected one of the small data transmission procedure and the connection establishment procedure is initiated for the data transmission.