CU-DU Multicast Service Mapping for Unicast Logical Channels
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Solution Overview
Problem
There is no related technology to implement transmitting a multicast service in a unicast manner in a CU-DU architecture within 5G communication systems.
Innovation Solution
A method for multicast communication is provided, where a first network device, acting as a CU, interacts with a second network device, acting as a DU, to determine and transmit an association relationship between multicast service information and a logical channel of a terminal device, enabling flexible transmission of the multicast service through unicast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast service is transmitted in traditional multicast manner, then network resource utilization is improved, but there is no mechanism to support unicast transmission of multicast service in CU-DU architecture
Solution Approach 1:
The patent segments the network device into CU (Central Unit) and DU (Distributed Unit) with distinct protocol layer functions. The CU handles PDCP, SDAP, and RRC layers, while the DU handles RLC, MAC, and PHY layers. This segmentation enables independent optimization of each unit and allows flexible configuration of multicast service transmission modes without increasing overall system complexity.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where the network can flexibly switch between multicast and unicast transmission modes for multicast services. Through RRC configuration messages and dynamic parameter adjustment, the system adapts transmission modes based on service requirements, terminal capabilities, and network conditions, achieving transmission mode flexibility within the CU-DU architecture.
2Adaptability or versatility
If multicast service is transmitted in unicast manner, then transmission flexibility is improved, but network resource utilization deteriorates
Solution Approach 1:
The patent implements dynamic transmission mode selection that switches between multicast and unicast based on real-time network conditions and service requirements. When multiple terminals require the same multicast service, the system uses multicast transmission to save resources. When only one terminal needs the service or specific quality requirements exist, unicast transmission is activated, achieving optimal resource utilization while maintaining flexibility.
Solution Approach 2:
The patent changes transmission parameters dynamically by configuring different RLC modes (acked, unacked, UM), different logical channel priorities, and different QoS parameters for multicast versus unicast transmission. These parameter changes enable the system to optimize resource usage for each transmission mode while maintaining the ability to switch between modes as needed.
Data Source
AI summary
A method for multicast communication, a first network device, and a second network device. The method includes: a first network device sends first information to a second network device, where the first information indicates an association relationship between multicast service information and a first terminal device; the first network device receives second information from the second network device; the first network device generates a configuration message based on the second information, where the configuration message indicates an association relationship between the multicast service information and a first logical channel, and the first logical channel is a logical channel of the first terminal device; and the first network device sends the configuration message to the first terminal device.