Central Unit Feedback Mechanism for Radio Network Message Delivery
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Solution Overview
Problem
In current radio network node architectures with a split configuration, the central unit lacks knowledge about the successful delivery of messages to wireless devices, which can lead to missed actions if messages are not delivered, as there is no feedback mechanism to confirm delivery.
Innovation Solution
Implementing a method where the central unit sends messages with associated identifiers to the distributed unit, which then transmits the messages to the wireless device and provides feedback on successful delivery, allowing the central unit to perform required actions if delivery is not confirmed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a split architecture is used between central unit and distributed unit, then the radio network node can be divided into modular components for flexible deployment, but the central unit loses knowledge of message delivery status to wireless devices
Solution Approach 1:
The distributed unit sends feedback messages to the central unit indicating whether messages were successfully delivered to wireless devices. This feedback mechanism restores the information flow about delivery status that was lost due to the architectural split, allowing the central unit to take appropriate actions based on delivery outcomes.
Solution Approach 2:
The distributed unit acts as an intermediary between the wireless devices and the central unit. It receives messages from the central unit, attempts delivery to wireless devices, and relays delivery status information back to the central unit, thereby bridging the information gap created by the modular architecture.
2Device complexity
If the central unit does not know whether messages are successfully delivered, then the system operates with simpler signaling between central and distributed units, but required actions cannot be performed when messages are not delivered
Solution Approach 1:
The feedback mechanism provides the central unit with delivery status information without adding significant complexity to the signaling protocol. The feedback can be implemented as simple acknowledgment messages containing delivery status, enabling reliable action execution while maintaining signaling efficiency.
Solution Approach 2:
The central unit prepares and stores the required actions in advance for potential message delivery failures. When feedback indicates unsuccessful delivery, the pre-prepared actions can be executed immediately without delay, ensuring reliability while minimizing the complexity of real-time decision-making.
Data Source
AI summary
Methods, central unit (200A) and distributed unit (200B) of a radio network node (200), for handling a message received from a core node (204) for transmission to a wireless device (202). An action is required by the radio network node if the message is not successfully delivered to the wireless device. The central unit (200A) sends the message and an associated identifier I_msg to the distributed unit (200B) and then receives feedback indicating whether the message has been successfully delivered to the wireless device or not. The central unit (200A) performs the required action if the feedback does not confirm delivery of the message to the wireless device (202). The required action may include sending a non-delivery indication to the core node (204).