Multicast Data Transmission Management in Distributed Base Stations
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Solution Overview
Problem
In distributed base station environments, there is a lack of clarity on how a base station receives and transmits multicast and/or broadcast service data packets, particularly when implemented in a distributed manner, which hampers efficient management of multicast and/or broadcast communications.
Innovation Solution
A method is implemented in a Central Unit (CU) and a Distributed Unit (DU) of a base station to manage the transmission of multicast and/or broadcast services by configuring a downlink tunnel for transmitting data packets from the CU to the DU and then to multiple User Equipments (UEs), ensuring efficient communication and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast and broadcast services are implemented in a distributed base station environment, then service coverage and user reachability are improved, but clarity of data transmission management and resource allocation deteriorate
Solution Approach 1:
The base station is segmented into a Central Unit (CU) and one or more Distributed Units (DUs). The CU handles higher-layer protocols and control functions, while the DUs handle lower-layer protocols and radio frequency operations. This segmentation clarifies the division of labor in multicast and broadcast service data transmission, with the CU managing data routing and the DUs executing transmission, thereby resolving the management complexity issue while maintaining service coverage.
Solution Approach 2:
An intermediary interface (F1 interface) is introduced between the CU and DU to standardize data transmission and control signaling. This intermediary layer provides clear protocols and procedures for multicast and broadcast service data flow, establishing well-defined management rules that reduce the complexity of coordinating distributed components while enabling extended service coverage.
2Adaptability or versatility
If distributed base station architecture is used for multicast services, then transmission flexibility and network scalability are improved, but resource allocation efficiency and data delivery reliability deteriorate
Solution Approach 1:
The CU is designed with multi-functional capabilities to handle both unicast and multicast/broadcast services through a unified architecture. The CU manages multiple DUs and can dynamically allocate resources for different service types, ensuring that multicast services benefit from the same reliable resource management framework as unicast services while maintaining network scalability.
Solution Approach 2:
Feedback mechanisms are implemented between the CU and DU, and from UEs to the base station, to monitor data transmission status and resource allocation effectiveness. This feedback enables dynamic adjustment of resource allocation for multicast services, ensuring reliable data delivery while maintaining the flexibility and scalability of the distributed architecture.
Data Source
AI summary
A method for managing transmission of multicast and/or broadcast services (MBS) is implemented in a central unit (CU) of a distributed base station that includes the CU and a distributed unit (DU). The method includes receiving, from a core network (CN), a request to configure CN-to-BS resources for transmitting downlink (DL) MBS data associated with an MBS session, from the CN for multiple user equipment units (UEs) via the distributed base station (602); obtaining a configuration for a downlink (DL) tunnel for transmitting the DL MBS data from the CU to the DU (606); and communicating the DL MBS data between the CN and the DU using the CN-to-BS resources and the configuration for the DL tunnel (614, 616).