Feedback-Driven DU-CU Unicast–Multicast Switching for MBS Continuity
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Solution Overview
Problem
In wireless communication systems, there is a need for efficient switching between unicast and multicast transmissions to manage radio resources effectively and ensure service continuity for wireless devices in a connected state.
Innovation Solution
A method implemented by a Distributed Unit (DU) of a Radio Access Network (RAN) node, where the DU provides Multicast and/or Broadcast Services (MBS) using an initial transmission mode, receives feedback from the wireless device, and sends switching messages to a Central Unit (CU) to switch between unicast and multicast transmissions based on the feedback and available radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast transmission is used for MBS, then radio resource efficiency is improved, but service continuity and user experience may deteriorate when device mobility or channel conditions change
Solution Approach 1:
The patent implements dynamic switching between unicast and multicast transmission modes based on real-time feedback from wireless devices. The network determines channel conditions, device mobility states, and service requirements to adaptively select the optimal transmission mode, ensuring both resource efficiency and service continuity are maintained under varying conditions.
Solution Approach 2:
The patent establishes a feedback mechanism where wireless devices report their channel conditions, mobility states, and reception quality to the network. This feedback enables the network to make informed decisions about transmission mode switching, adjusting between unicast and multicast based on actual device needs and environmental conditions.
2Reliability
If unicast transmission is used for MBS, then service continuity is improved, but radio resource efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts transmission mode based on real-time conditions. When devices are stationary with good channel conditions, multicast is used for efficiency. When devices become mobile or channel conditions degrade, the system switches to unicast to maintain service continuity, optimizing the balance between efficiency and reliability.
Solution Approach 2:
The patent changes the transmission mode parameter (unicast/multicast) based on varying channel conditions, device mobility, and service requirements. This parameter adjustment allows the system to optimize resource usage while maintaining service quality across different operational scenarios.
3Productivity
If transmission mode switching is implemented, then resource management efficiency is improved, but system complexity increases
Solution Approach 1:
The patent introduces a network controller as an intermediary that manages the complexity of transmission mode switching. The controller receives feedback from devices, determines optimal transmission modes, and coordinates the switching process, thereby centralizing the complexity management and reducing the burden on individual devices while improving overall resource management efficiency.
4Reliability
If dynamic switching between unicast and multicast is performed, then service quality is improved, but feedback mechanism complexity increases
Solution Approach 1:
The patent designs a universal feedback mechanism that devices can use to report their status regardless of the current transmission mode. The feedback structure is standardized and multi-functional, accommodating different device states, channel conditions, and service requirements in a unified manner, thereby reducing the complexity of implementing mode-specific feedback protocols.
Data Source
AI summary
A method and apparatus for switching between unicast and multicast in a wireless communication system is provided. A DU of a RAN node provides the MBS by using a first transmission to the wireless device. A DU of a RAN node receives, from the wireless device, feedback information in response to the provided MBS. A DU of a RAN node transmits, to a central unit (CU) of the RAN node, a first switching message based on the received feedback information. A DU of a RAN node receives, from the CU, a second switching message to switch the first transmission to the second transmission for the MBS. A DU of a RAN node provides the MBS by using the second transmission to the wireless device.