5G gNB CU-DU PWS Message Identification and Priority Handling
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Solution Overview
Problem
In the 5G mobile network, the Distributed Unit (DU) of a gNB faces challenges in identifying and prioritizing Public Warning System (PWS) messages due to the lack of Message Identifiers and Serial Numbers, making it difficult to prevent duplicate transmissions and prioritize messages correctly.
Innovation Solution
The Central Unit (CU) includes PWS identifiers and Priority Indicators in the messages transmitted to the DU, allowing the DU to perform duplication and priority determinations, and specify which messages to stop or transmit based on these identifiers and indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the CU aggregates PWS message information into one piece of information for transmission to the DU, then the transmission efficiency is improved, but the DU cannot perform duplication determination and priority determination of multiple PWS messages
Solution Approach 1:
The patent segments the PWS message information into two parts: aggregation of message content by the CU for efficiency, and preservation of individual message identifiers (serial numbers) for the DU to perform duplication and priority determination. This segmentation resolves the contradiction by allowing both efficient transmission and proper message identification.
Solution Approach 2:
The patent introduces an intermediary mechanism where the CU acts as a mediator that aggregates PWS messages while preserving essential identification information (serial numbers) and transmitting it to the DU. This intermediary approach allows the DU to perform duplication and priority determination without receiving all raw message data, thus maintaining both efficiency and functionality.
2Device complexity
If the DU transmits PWS messages with no change to the radio section, then the processing complexity is reduced, but the DU cannot specify which PWS messages to stop or prioritize
Solution Approach 1:
The patent applies preliminary action by having the CU pre-process PWS messages and attach serial numbers before transmission to the DU. This preliminary tagging enables the DU to easily perform duplication and priority determination without increasing its processing complexity, as the identification work is prepared in advance by the CU.
3Device complexity
If the CU deletes PWS message identification information when a PWS Cancel Request is received, then the message control is simplified, but the DU cannot specify the PWS message to be stopped
Solution Approach 1:
The patent implements a feedback mechanism where the DU sends an indication to the CU when a PWS Cancel Request is received, allowing the CU to delete the corresponding PWS message information. This feedback loop ensures that the DU can accurately specify which message to stop (using preserved serial numbers) while the CU maintains simplified control by deleting information only after confirmation.
Data Source
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AI summary
A communication apparatus is configured to perform processing, the processing including: executing an addition processing configured to add identification information for identifying report information to processed report information obtained by performing processing corresponding to a type of the report information on the report information received from a higher-level network; and executing a transmission processing configured to transmit the processed report information to which the identification information is added by the addition unit to a second communication apparatus coupled to a radio link.