Distributed Base Station Multicast Resource Management
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multicast radio resources for multicast and broadcast services in distributed base stations, particularly in determining the appropriate multicast configuration parameters for quality of service (QoS) and session identifiers, which affects the transmission of multicast and broadcast services.
Innovation Solution
A distributed base station manages multicast radio resources by selectively including or omitting multicast configuration parameters in messages based on QoS parameters, session identifiers, or MRB identifiers, allowing dynamic scheduling or semi-persistent scheduling configurations to optimize resource allocation and service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast configuration parameters are always included in CU-to-DU messages, then complete service configuration is ensured, but message overhead and processing complexity increase
Solution Approach 1:
The patent implements dynamic inclusion of multicast configuration parameters in CU-to-DU messages based on the specific service type (QoS-based or session-based multicast). The CU selectively includes only the necessary parameters (either QoS parameters or session identifiers) rather than always including all parameters, thereby reducing message overhead while ensuring complete configuration for the specific service type.
Solution Approach 2:
The patent applies different configuration parameter inclusion strategies based on the local requirements of different multicast service types. For QoS-based multicast, QoS parameters are included; for session-based multicast, session identifiers are included. This localized approach ensures each message contains only the relevant parameters needed for that specific service, reducing overall complexity.
2Adaptability or versatility
If dynamic scheduling is used for multicast services, then resource allocation flexibility is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements dynamic scheduling for multicast services where the CU dynamically allocates radio resources based on current network conditions and service requirements. The scheduling decisions are communicated to DUs through optimized signaling that includes only essential dynamic parameters, reducing overhead while maintaining flexibility.
Solution Approach 2:
The patent extracts and separates static multicast configuration parameters (which remain constant) from dynamic parameters (which change with scheduling decisions). By taking out the static parameters that don't need frequent updates, the control signaling overhead is reduced while dynamic parameters are transmitted only when changes occur, maintaining flexibility without excessive overhead.
3Loss of information
If semi-persistent scheduling is used for multicast services, then control signaling overhead is reduced, but resource allocation flexibility decreases
Solution Approach 1:
The patent implements semi-persistent scheduling where multicast resources are allocated periodically at fixed intervals rather than dynamically for each transmission. This periodic action reduces control signaling overhead significantly. The CU establishes semi-persistent resource allocations that automatically recur, eliminating the need for continuous scheduling messages while maintaining adequate resource allocation for steady-state multicast services.
Solution Approach 2:
While using semi-persistent scheduling for routine operations, the patent maintains dynamic reconfiguration capability when service requirements change. The CU can transition from semi-persistent to dynamic scheduling when needed, providing adaptability to handle both steady-state and changing service conditions, thus balancing overhead reduction with flexibility preservation.
Data Source
AI summary
Methods for managing radio resources for multicast and/or broadcast services (MBS), which may be implemented in a distributed unit (DU) or a central unit (CU) of a distributed base station, are provided. One such method, in a DU, includes receiving, from a CU, a CU-to-DU message associated with an MRB, and including, based on QoS parameter(s) included in the CU-to-DU message, one or more multicast configuration parameters in a DU-to-CU message. The method also includes transmitting the DU-to-CU message to the CU. Another method, in a CU, includes receiving, from a core network, a CN-to-BS message associated with an MBS session, and including, based on one or more QoS parameters included in the CN-to-BS message, an indication to request one or more multicast configuration parameters in a CU-to-DU message. The method also includes transmitting the CU-to-DU message to a DU of the distributed base station.