Enhanced Paging for Small Downlink Data in RRC Inactive State
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Solution Overview
Problem
Current small data transmission (SDT) procedures in mobile telecommunications networks only allow a UE to remain in the RRC inactive state for uplink data transmissions, failing to extend this efficiency to downlink data, which results in unnecessary transitions to the RRC connected state regardless of data size.
Innovation Solution
An enhanced paging message is introduced that includes a transmission size indicator, allowing the UE to determine the required connection state based on the incoming data size, enabling small data transmission (SDT) in both uplink and downlink directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to RRC connected state to receive any downlink data, then reliable data reception is ensured, but power consumption and delay increase for small data payloads
Solution Approach 1:
The patent changes the parameter of connection state based on data size. For small data payloads, the UE remains in RRC inactive state; for larger payloads, the UE transitions to RRC connected state. This parameter change resolves the contradiction by avoiding unnecessary state transitions for small data, reducing power consumption while maintaining reliable reception for larger data.
Solution Approach 2:
The patent introduces dynamic connection state management where the UE's RRC state is not fixed but adapts based on the incoming data size. The UE dynamically decides whether to stay in inactive state or transition to connected state based on the data payload size, optimizing the balance between reliability and power consumption.
2Reliability
If the UE transitions to RRC connected state to receive any downlink data, then data reception is ensured, but transmission delay increases for small data payloads
Solution Approach 1:
The patent changes the connection state parameter based on data size threshold. Small data payloads trigger remaining in RRC inactive state, while larger payloads trigger transition to RRC connected state. This resolves the delay contradiction by avoiding unnecessary state transitions for small data, reducing transmission delay while ensuring reliable reception for larger data.
Solution Approach 2:
The patent implements dynamic connection state adjustment where the UE's RRC state adapts to the data payload size. This dynamic behavior reduces transmission delay for small data by skipping the state transition process, while maintaining reliable data reception for larger data that requires connected state.
3Device complexity
If all downlink transmissions are treated equally, then system simplicity is maintained, but system resource efficiency decreases for varying data sizes
Solution Approach 1:
The patent applies local quality by treating different data transmissions differently based on their size characteristics. Instead of uniform treatment, the system applies specific handling rules for small data payloads (remain in inactive state) versus large data payloads (transition to connected state), optimizing resource efficiency for each local case while maintaining overall system simplicity.
Solution Approach 2:
The patent introduces a data size parameter that triggers different transmission behaviors. By monitoring data payload size and changing the connection state parameter accordingly, the system achieves efficient resource utilization for varying data sizes without significantly complicating the overall system architecture.
Data Source
AI summary
The present invention relates to methods, systems and apparatus for facilitating Small Data Transmissions (SDT) in a mobile telecommunications network. In particular, the present disclosure relates to a method comprising receiving, at a base station of the mobile telecommunications network, a portion of data to be transmitted to a terminal connected to the mobile telecommunications network; determining a transmission size indicator for the portion of data; and providing an enhanced paging message to the terminal, the enhanced paging message including the transmission size indicator, wherein the enhanced paging message is configured to allow the terminal to determine a required terminal connection state, for receiving the portion of data, based on the transmission size indicator.