Mobile-Terminated Early Data Transmission Context Handling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling User Equipment (UE) context for early transmission of mobile-terminated data, particularly in reducing unnecessary radio and core network resource usage and improving UE power consumption.
Innovation Solution
The proposed solution involves a method in a network node for early data transmission, where a paging message with an early data transmission indication is sent to the suspended UE, followed by obtaining the UE context and resuming the data connection based on this context, allowing for secure and reliable MT-EDT with reduced signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE context is obtained before MT-EDT data transmission, then security and reliability are improved, but signaling overhead and network resource usage increase
Solution Approach 1:
The network node performs preliminary actions by obtaining the UE context in advance before the actual MT-EDT data transmission. This allows the network to have all necessary security information and connection state ready, enabling secure early data transmission without requiring additional signaling during the critical transmission phase.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network node acts as a mediator between the suspended UE and the core network. By obtaining UE context through this intermediary process before data transmission, the system establishes security contexts and connection parameters without requiring complex real-time signaling during the EDT phase.
2Productivity
If paging message includes EDT indication, then early data transmission efficiency is improved, but radio resource usage increases
Solution Approach 1:
The patent segments the MT-EDT process into distinct phases: first obtaining UE context and establishing security parameters, then transmitting data in the paging message. This segmentation allows efficient early data transmission while controlling radio resource usage by separating context setup from actual data transmission.
Solution Approach 2:
By performing preliminary context acquisition and security setup before the paging message transmission, the system maximizes the efficiency of the actual data transmission phase. The preliminary actions ensure that when data is transmitted in the paging message, all necessary parameters are already in place, reducing the need for additional signaling resources.
3Reliability
If connection is resumed based on obtained context, then data transmission reliability is improved, but network node processing complexity increases
Solution Approach 1:
The network node performs preliminary context acquisition and security parameter setup before the connection resumption process. This preliminary action ensures that when the connection is resumed, all necessary parameters are ready, simplifying the resumption process and improving reliability without significantly increasing processing complexity during the critical resumption phase.
Solution Approach 2:
The patent employs copying of UE context information from the suspended connection state to the new connection establishment. By copying relevant context parameters and security information, the network node can efficiently resume the connection with high reliability while managing processing complexity through structured context transfer mechanisms.
Data Source
AI summary
A method in a target network node and a corresponding network node, for performing secure Mobile Terminated (MT) early data transmission (EDT) is provided. The method may comprise: sending a paging message to the wireless device, which has been suspended from a connection with a second network node, the paging message comprising an early data transmission (EDT) indication; receiving a random access preamble from the wireless device; obtaining context information of the wireless device; and resuming a data connection with the wireless device based on the context information.