5G Data Transmission With Local DU Cell Switching
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Solution Overview
Problem
Conventional cell switch methods in 5G systems experience delays due to information exchange between the central unit (CU) and distributed unit (DU) via the F1 interface, leading to potential communication call drops when signal quality deteriorates.
Innovation Solution
A data transmission method where a network device determines a switch command based on a measurement report without sending the measurement report to the CU, using pre-established UL and DL GTP TEIDs for direct data forwarding, thereby reducing switch delays and improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the CU determines the switch command based on the measurement report transmitted through the F1 interface, then the switch decision can be made centrally, but the switch delay increases
Solution Approach 1:
The patent extracts the measurement report transmission step from the conventional L3 switch process. Instead of transmitting the measurement report from the terminal device to the CU through the DU and F1 interface, the measurement report is directly provided to the DU. This extraction eliminates the F1 interface transmission delay and enables the DU to determine the switch command locally, thereby reducing switch delay while maintaining centralized control through the CU's provision of measurement reports.
Solution Approach 2:
The patent introduces the DU as an intermediary that receives measurement reports directly from the terminal device and uses them to determine switch commands. This intermediary role allows the DU to perform high real-time processing locally without requiring continuous F1 interface communication with the CU for every measurement report, thus reducing delay while maintaining the CU's central coordination function.
2Speed
If the measurement report is transmitted to the CU through the DU and F1 interface, then centralized control is maintained, but the switch response time slows down
Solution Approach 1:
The patent segments the switch decision-making process into two parts: the CU provides measurement report configuration and receives measurement reports from the terminal, while the DU determines the switch command based on these reports. This segmentation allows the measurement report transmission to occur separately from the switch command determination, enabling the DU to respond quickly using locally available information while the CU maintains overall control through configuration provision.
Solution Approach 2:
The CU performs preliminary action by providing measurement report configuration information to the DU in advance. This allows the DU to be prepared to process measurement reports and determine switch commands immediately when received, without needing to request or wait for CU processing at the moment of measurement, thus improving response speed.
Data Source
AI summary
Example data transmission methods and apparatus are described. In one example method, a first network device and a second network device exchange information by using first request information and first response information. The first request information includes a first uplink (UL) general packet radio service tunneling protocol (GTP) tunnel endpoint identifier (TEID) and identification information of at least one candidate cell corresponding to the first UL GTP TEID. The first response information includes a first downlink (DL) GTP TEID and configuration information of the at least one candidate cell corresponding to the first DL GTP TEID. The first network device sends a switch command to a terminal device based on a measurement report of the at least one candidate cell.