MT-SDT Paging for Small Data Reception in RRC Inactive
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Solution Overview
Problem
Existing telecommunication systems fail to efficiently manage Mobile Terminating (MT) UEs in the RRC Inactive state for small data transmissions, leading to unnecessary transitions to the RRC Connected state due to lack of indication for available small data payloads, resulting in high latency, signaling, and power consumption.
Innovation Solution
A paging message is enhanced to include an MT-SDT paging cause, allowing MT UEs to recognize available small data payloads and respond using Small Data Transmission (SDT) procedures while remaining in the RRC Inactive state, thereby avoiding state transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MT UEs transition to RRC Connected state to receive small data payloads, then data reception is enabled, but latency and power consumption increase
Solution Approach 1:
The network performs preliminary actions by sending a paging message with an indication of available small data payload before the UE needs to transition state. This allows the UE to be pre-notified of data availability while remaining in RRC Inactive state, avoiding unnecessary state transitions and reducing latency.
Solution Approach 2:
A paging message with a specific indication serves as an intermediary between the network and the UE. This intermediary mechanism allows the network to notify the UE of small data payload availability without requiring the UE to continuously monitor or transition to connected state, thus reducing latency and power consumption.
2Reliability
If MT UEs transition to RRC Connected state to receive small data payloads, then data reception is enabled, but power consumption increases
Solution Approach 1:
The network sends a paging message with an indication of available small data payload as a preliminary action. This allows the UE to remain in low-power RRC Inactive state and only wake up or respond when actually needed, avoiding continuous monitoring and reducing power consumption.
Solution Approach 2:
The paging message with indication acts as an intermediary that enables the network to communicate data availability to the UE without requiring the UE to maintain high-power connected state. The UE can stay in low-power mode and only transition when necessary.
3Reliability
If MT UEs transition to RRC Connected state to receive small data payloads, then complete data transfer is enabled, but signaling overhead increases
Solution Approach 1:
The essential function of notifying the UE about data availability is extracted from the full RRC connection establishment procedure. By using a paging message with a specific indication, the system separates the notification function from the complete connection setup, reducing signaling overhead while maintaining data transfer capability.
Solution Approach 2:
The paging message with indication serves as a preliminary action that prepares the UE for potential data reception without requiring full connection establishment. This preliminary notification reduces the amount of signaling needed compared to traditional approaches where the UE must fully connect to receive data.
Data Source
AI summary
A user equipment (UE) can be a mobile terminating (MT) device that may receive data from another UE or other network element via a telecommunication network. When a small data payload is available for an MT UE, a base station of the telecommunication network can send a paging message to the UE that includes a Mobile Terminating Small Data Transmission (MT-SDT) paging cause. Based on the MT-SDT paging cause in the paging message, the UE can use Small Data Transmission (SDT) procedures to respond to the paging message. The SDT procedures can allow the UE to obtain the small data payload while the UE remains in a Radio Resource Control (RRC) Inactive state.