RRC Message Mapping to User Plane Data Streams
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Solution Overview
Problem
In 5G systems, the separation of central units (CU) and distributed units (DU) on the radio access network side leads to incorrect transmission of radio resource control (RRC) messages, as existing methods do not specify how these messages are transmitted between the CU and DU.
Innovation Solution
Mapping RRC messages into user plane data streams and sending them with effective time and logical channel identifiers through either the user plane using GTP-U headers or the control plane via interface application protocol layers, ensuring correct transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC messages are transmitted through the interface between CU and DU in 5G system, then the control function can be separated and centralized, but the transmission method is not specified leading to incorrect transmission
Solution Approach 1:
The patent introduces a mapping mechanism that maps RRC messages into user plane data streams as an intermediary solution. This allows RRC messages to be transmitted through the user plane interface between CU and DU, solving the problem of undefined transmission methods while maintaining the CU-DU separation architecture.
Solution Approach 2:
The patent enables the user plane to serve dual purposes: transmitting both user data and RRC control messages. By mapping RRC messages into user plane data streams, the system achieves multi-functionality in the transmission interface, eliminating the need for separate control message transmission paths.
2Ease of manufacture
If RRC messages are mapped into user plane data streams, then transmission can be achieved through existing interfaces, but additional mapping and metadata handling complexity is introduced
Solution Approach 1:
The patent merges RRC message transmission with user plane data transmission by mapping RRC messages into user plane data streams. This combining approach allows both control and user data to share the same transmission path, reducing the need for separate handling mechanisms.
Solution Approach 2:
The patent applies preliminary action by adding metadata (effective time and logical channel identifier) to RRC messages before mapping them into user plane data streams. This pre-processing ensures that the DU can correctly identify and handle the mapped RRC messages without requiring complex real-time analysis.
3Measurement precision
If effective time and logical channel identifiers are added to RRC messages, then correct transmission and identification are ensured, but message structure complexity increases
Solution Approach 1:
The patent introduces metadata (effective time and logical channel identifier) as an intermediary layer between the RRC message content and the user plane data stream. This intermediary structure enables precise identification and handling of RRC messages without fundamentally altering the core message format, maintaining a clear separation between control information and user data.
Data Source
AI summary
A method for transmitting a radio resource control message, a network side central unit, and a network side distributed unit are provided. The method for transmitting a radio resource control (RRC) message includes: mapping the radio resource control (RRC) message into a data stream of a level corresponding to a user plane; and sending effective time and a logical channel identifier of the RRC message and the data stream to a corresponding network side distributed unit (DU) through the user plane or a control plane.