Multicast Broadcast Mode Switching for 5G NR Resource Optimization
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently managing multicast and broadcast services due to variations in user equipment distribution, leading to suboptimal use of radio resources.
Innovation Solution
A method and apparatus at user equipment (UE) and network nodes that dynamically switch between multicast, broadcast, and unicast sessions for multicast broadcast services (MBS) based on the number of user equipment receiving content, using indications from network nodes to adjust the transmission mode and ensure efficient use of wireless resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast session is used for MBS content transmission, then service reliability for group of UEs is improved, but radio resource utilization deteriorates when UE distribution is sparse
Solution Approach 1:
The system dynamically switches between multicast and broadcast modes based on real-time UE distribution conditions. The network node monitors the number of active UEs and adjusts the transmission mode accordingly, transitioning from multicast when UE density is high to broadcast when UE density is low, thereby optimizing radio resource utilization while maintaining service reliability.
Solution Approach 2:
The invention changes the transmission mode parameter between multicast and broadcast based on the number of UEs receiving content. When the number of UEs falls below a threshold, the system switches from multicast to broadcast mode, adjusting the transmission parameter to match the actual service needs and improve resource efficiency.
2Loss of energy
If broadcast session is used for MBS content transmission, then radio resource utilization is improved when UE distribution is sparse, but service reliability deteriorates when UE distribution is dense
Solution Approach 1:
The system dynamically adapts the transmission mode by switching from broadcast to multicast when UE density increases above a threshold. This dynamic adjustment ensures that the system uses broadcast mode for resource efficiency in sparse conditions but switches to multicast mode to maintain service reliability when more UEs are present.
Solution Approach 2:
The transmission mode parameter is changed from broadcast to multicast when the number of UEs exceeds a predetermined threshold, allowing the system to optimize both resource utilization and service reliability based on real-time network conditions.
3Device complexity
If fixed transmission mode is used for MBS, then system complexity is reduced, but adaptability to UE distribution variations deteriorates
Solution Approach 1:
The system introduces dynamic transmission mode selection between multicast and broadcast based on UE distribution conditions. The network node monitors the number of active UEs and automatically adjusts the transmission mode, adding adaptability while managing complexity through automated decision-making based on predefined thresholds.
4Loss of energy
If network node suspends one session for MBS, then radio resource utilization is optimized, but service continuity for affected UE deteriorates
Solution Approach 1:
The network node uses feedback information about the number of active UEs to make informed decisions about session suspension. When the number of UEs falls below a threshold, the network suspends the multicast session and notifies affected UEs, allowing resource optimization while managing service continuity through informed feedback-based decision-making.
Solution Approach 2:
The network node acts as an intermediary that manages the transition between transmission modes. When suspending a session, the network node coordinates the switch to the other session (multicast to broadcast or vice versa) and notifies UEs of the change, ensuring smooth transition and maintaining service continuity.
Data Source
AI summary
Apparatus, methods, and computer program products for multicast broadcast service (MBS) are provided. An example method may include a configuration of multicast service information and broadcast service information, the multicast service information being for a multicast session for an MBS scheduled to transmit content to the UE, the broadcast service information being for a broadcast session for the MBS scheduled to transmit the content to the UE. The example method may further include receiving, from a network node, an indication that indicates a suspension of one of the multicast session or the broadcast session for the MBS. The example method may further include obtaining the content via a unicast session or a non-suspended session in response to the indication, the non-suspended session being the other of the multicast session or the broadcast session.