User Equipment Early Data Transmission Fallback Mechanism
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Solution Overview
Problem
Existing wireless communication technologies face significant signaling overhead and energy consumption when transmitting small data packets in NB-IoT and MTC, as they often require entering an RRC connected state, leading to inefficient data transmission and unnecessary energy usage.
Innovation Solution
A method for user equipment to perform fallback to a conventional data transmission procedure from an ongoing small data transmission procedure by transmitting a random access preamble, receiving a random access response, and determining if early data transmission can be performed, with options to flush data, interrupt the current procedure, or re-establish RRC configurations as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE enters RRC connected state to transmit small data packets, then data transmission can be completed, but signaling overhead increases and energy consumption increases
Solution Approach 1:
The patent segments the data transmission process into two paths: early data transmission (EDT) for small data packets that can be sent during random access procedure, and conventional RRC connected state transmission for larger or multiple data packets. This segmentation allows the system to choose the most energy-efficient path based on data size and type.
Solution Approach 2:
The patent enables preliminary data transmission during the random access procedure before establishing full RRC connection. By allowing small data packets to be transmitted in Msg3 of the random access procedure, the system performs data transmission action before the full connection setup, reducing the need for complete RRC connection establishment and thereby reducing energy consumption.
2Productivity
If UE enters RRC connected state to transmit small data packets, then data transmission can be completed, but signaling overhead increases
Solution Approach 1:
The patent segments the transmission protocol into EDT mode for small data packets and conventional RRC mode for larger data. This segmentation reduces signaling overhead by avoiding full RRC connection setup procedures for small data packets, as EDT uses simplified random access messaging instead of complete RRC connection establishment.
Solution Approach 2:
The patent performs preliminary data transmission during the random access procedure itself, utilizing Msg3 to carry small data packets before RRC connection is fully established. This preliminary action eliminates the need for subsequent data transmission signaling that would occur after full connection setup, thereby reducing overall signaling overhead.
3Quantity of substance
If UE falls back to conventional data transmission procedure from EDT, then more data can be transmitted, but transmission efficiency decreases
Solution Approach 1:
The patent implements a dynamic fallback mechanism where the transmission mode can switch from EDT to conventional RRC connected state based on real-time conditions. When EDT proves insufficient (e.g., buffer still contains data after EDT attempt), the system dynamically transitions to the more capable RRC mode, ensuring both data volume requirements and transmission efficiency are optimized based on actual needs.
Data Source
AI summary
The present disclosure provides a method performed by user equipment. The method comprises: transmitting a random access preamble for early data transmission (EDT) on a physical random access channel resource for EDT; receiving a random access response (RAR); and performing fallback to a non-EDT procedure if it is determined according to an uplink grant in the received RAR that EDT transmission cannot be performed. Further provided is corresponding user equipment.