User Equipment Inactive State Small Data Transmission
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Solution Overview
Problem
Current 5G NR systems face inefficiencies in handling small data transmissions from a user equipment (UE) in an inactive state, requiring state transitions to connected state for each data transmission, leading to increased power consumption and signaling overhead.
Innovation Solution
The system allows for efficient handling of non-SDT data arrivals during an SDT procedure by utilizing existing transmission opportunities for traffic indications, avoiding additional UL grants and RACH procedures, thereby saving power and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to connected state for each data transmission, then data transmission reliability is improved, but power consumption increases and signaling overhead increases
Solution Approach 1:
The patent segments data transmission into two types: small data that can be transmitted in inactive state using uplink grants, and large data requiring connected state. This segmentation allows the UE to remain in inactive state for small data transmissions, reducing power consumption while maintaining reliability for appropriate data sizes.
Solution Approach 2:
The network pre-configures uplink grants and transmission opportunities for the UE while in inactive state. This preliminary action enables the UE to transmit small data immediately without transitioning to connected state, thereby reducing power consumption and signaling overhead while ensuring transmission reliability.
2Reliability
If the UE transitions to connected state for each data transmission, then data transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent segments data transmission into two types: small data that can be transmitted in inactive state using uplink grants, and large data requiring connected state. This segmentation allows the UE to remain in inactive state for small data transmissions, reducing power consumption while maintaining reliability for appropriate data sizes.
Solution Approach 2:
The network pre-configures uplink grants and transmission opportunities for the UE while in inactive state. This preliminary action enables the UE to transmit small data immediately without transitioning to connected state, thereby reducing power consumption and signaling overhead while ensuring transmission reliability.
3Reliability
If the UE waits for transmission opportunity in CG procedure, then collision with other UEs is avoided, but transmission delay increases
Solution Approach 1:
The network pre-configures specific transmission opportunities and uplink grants for the UE before it enters inactive state. This preliminary action allows the UE to transmit data at predetermined times without waiting for dynamic grants, reducing transmission delay while maintaining collision avoidance through network-coordinated resource allocation.
Solution Approach 2:
The patent implements a dynamic mechanism where the UE can switch between waiting for CG transmission opportunities and using pre-configured uplink grants based on data arrival timing. This dynamics allows the UE to minimize waiting time by utilizing available grants immediately when data arrives, reducing delay while maintaining reliable transmission through coordinated resource management.
Data Source
AI summary
A user equipment (UE) includes a transceiver and circuitry. The circuitry detects, while in a procedure for transmitting first data in an inactive state, that second data are to be transmitted in a connected state, and determines whether or not there is a transmission opportunity to wait for. When it is determined that there is no transmission opportunity to wait for or the transmission opportunity to wait for is no longer expected to occur, the circuitry initiates a random access channel (RACH) procedure for entering a connected state. When, on the other hand, it is determined that there is the transmission opportunity to wait for and the transmission opportunity occurs, the circuitry controls the transceiver to transmit, using the transmission opportunity, a traffic indication indicating the detection of the second data.