Base Station Data Forwarding for Light Connection State
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Solution Overview
Problem
In wireless communication systems, particularly in light connection states where the terminal's RRC connection with a base station is deactivated but maintains a connection with the core network, there is a need for an efficient method to forward downlink data between base stations, as existing techniques incur signaling overhead and lack a defined process for data transfer in such scenarios.
Innovation Solution
A method where a first base station requests and receives information for data transfer from a second base station, including a downlink GTP tunnel endpoint, and transmits a paging request to facilitate data forwarding for a UE in a light connection state, reducing signaling overload by maintaining a connection with the MME or AMF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal moves to coverage of another base station in light connection state, then data transfer between base stations is required, but existing techniques incur signaling overhead and lack defined data transfer process
Solution Approach 1:
The patent introduces a defined data transfer process where the source base station acts as an intermediary to forward downlink data to the target base station. The MME serves as a mediator that coordinates the data transfer by sending downlink data directly to the source base station, which then forwards it to the target base station via X2 interface, eliminating the need for complex paging message exchanges between base stations.
Solution Approach 2:
The patent establishes preliminary actions by defining the data transfer process before the terminal actually moves. The source base station prepares for potential data transfer by maintaining light connection state, and when data arrives at the MME, the transfer process is already defined and ready to execute, reducing the need for real-time signaling during the actual handover.
2Productivity
If downlink data is forwarded between base stations, then seamless data transfer is achieved, but frequent paging messages increase signaling overhead
Solution Approach 1:
The patent extracts the data transfer function from the traditional paging message mechanism. Instead of using paging messages to coordinate data transfer between base stations, the invention separates the data forwarding function into a dedicated process where the source base station directly forwards downlink data to the target base station through the X2 interface, eliminating unnecessary paging signaling.
Solution Approach 2:
The patent enables continuous data transfer by maintaining the light connection state and establishing a direct data forwarding path between base stations. The source base station continuously monitors for downlink data and forwards it to the target base station without interruption, ensuring seamless data flow while minimizing signaling interactions.
Data Source
AI summary
Provided are a data transmission method performed by a base station in a wireless communication system, and an apparatus using the method. The base station transmits a message requesting information for data transmission to a second base station and receives, from the second base station, a response message to the message requesting the information for data transmission, wherein the information for data transmission is to transmit data on a terminal in a light connection state.