RRC Resume Context Retrieval for LTE Early Data Transmission
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Solution Overview
Problem
In Long Term Evolution (LTE) networks, the efficiency of Early Data Transmission (EDT) is hindered due to unclear requirements for transferring the context of a terminal device during the RRC connection resume procedure, leading to increased data transmission delays and signaling interactions.
Innovation Solution
A method where a target base station sends a retrieve terminal context request message to an anchor base station, carrying information to determine whether to transfer the terminal device's context, allowing packet data to be sent through either the target or anchor base station based on the anchor's decision, thus clarifying the transmission path and reducing signaling interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the anchor base station transfers context of the terminal device to the target base station during RRC connection resume procedure, then the target base station can handle packet data transmission, but the signaling interactions increase and transmission delays occur when context transfer is unnecessary
Solution Approach 1:
The target base station determines in advance whether context transfer is necessary before initiating the transfer process. By evaluating the availability of packet data transmission resources and the terminal's data transmission needs at the decision point, the system avoids unnecessary context transfers, thereby reducing signaling interactions and transmission delays while ensuring packet data can be transmitted when needed
2Reliability
If the target base station always retrieves terminal context from anchor base station, then context availability is ensured, but signaling interactions increase unnecessarily
Solution Approach 1:
The target base station autonomously determines whether to retrieve terminal context from the anchor base station based on local assessment of packet data transmission requirements. When the terminal has packet data to transmit and the target base station lacks necessary context, it initiates context retrieval; otherwise, it proceeds without transfer. This self-service approach reduces unnecessary signaling interactions while maintaining context availability when required
3Productivity
If context transfer is performed during EDT-triggered RRC connection resume, then the target base station can transmit packet data, but the transmission path becomes unclear leading to inefficiency
Solution Approach 1:
The transmission path for packet data is dynamically determined based on whether context transfer is performed. When the target base station has the terminal's context (either previously stored or newly retrieved), it directly transmits packet data to the core network. When context transfer is not performed, the terminal transmits packet data through the anchor base station. This dynamic path selection clarifies the transmission route and improves EDT efficiency by avoiding ambiguous routing
Data Source
AI summary
Provided are data transmission methods and apparatuses and a communication device. The method may include: receiving an RRC resume request by a target base station from a terminal device, the RRC resume request message carrying packet data; and acquiring the packet data by the target base station from the RRC resume request message, and sending a retrieve terminal context request message to an anchor base station, the retrieve terminal context request message carrying first information, and the first information being used for the anchor base station to determine whether to send a context of the terminal device to the target base station.