MBS Semi-Persistent Scheduling for Lower PDCCH Resource Use
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in using resources for multicast and broadcast services due to the repeated use of physical downlink control channel resources in dynamic scheduling, which is not optimized for periodic broadcast services.
Innovation Solution
A semi-persistent scheduling (SPS) operation method for multicast and broadcast service (MBS) reception, where user equipment (UE) receives configuration and activation messages from a base station, stores resource allocation and HARQ information, and transmits confirmation messages for MBS SPS, optimizing resource use by reducing reliance on PDCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic scheduling is used for multicast and broadcast services, then flexibility in resource allocation is improved, but resource consumption increases due to repeated PDCCH usage
Solution Approach 1:
The patent implements semi-persistent scheduling where PDCCH resources are used periodically rather than continuously. The network configures SPS parameters including periodicity, and after initial activation via PDCCH, subsequent transmissions occur without repeated PDCCH signaling, thereby reducing resource consumption while maintaining service continuity
Solution Approach 2:
The patent extracts the essential scheduling function from continuous PDCCH signaling and implements it through MAC layer configuration. By moving scheduling parameters to MAC-CE signaling and maintaining them semi-persistently, the system removes the need for repeated PDCCH transmissions while preserving resource allocation flexibility
2Loss of energy
If semi-persistent scheduling is implemented for MBS, then resource consumption is reduced by minimizing PDCCH usage, but system complexity increases due to MAC layer configuration management
Solution Approach 1:
The patent introduces MAC control elements as an intermediary layer between RRC configuration and physical layer transmission. MAC-CE signaling carries SPS activation, deactivation, and reconfiguration commands, simplifying the management complexity by providing a dedicated control mechanism that operates independently of both higher-layer RRC and lower-layer physical signaling
Solution Approach 2:
The patent enables the MAC layer to autonomously manage SPS configurations once activated. The system automatically handles periodic resource allocation, activation/deactivation timing, and conflict resolution with dynamic grants without requiring continuous network intervention, thereby reducing overall system complexity
3Reliability
If continuous PDCCH signaling is used for periodic broadcast services, then reliable resource allocation is ensured, but PDCCH resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies periodic action by configuring SPS with specific periodicity values that match the broadcast service requirements. PDCCH resources are allocated only at configured intervals rather than continuously, ensuring reliable resource allocation at necessary moments while improving overall PDCCH utilization efficiency by eliminating redundant signaling
Solution Approach 2:
The patent implements preliminary action through advance SPS configuration and activation. The network pre-allocates resources and activates SPS before actual data transmission begins, ensuring that reliable resource allocation is already in place when needed, while avoiding continuous PDCCH usage during the actual transmission period
Data Source
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AI summary
The disclosure provides a semi-persistent scheduling (SPS) operation method for multicast and broadcast service (MBS) reception by a user equipment (UE), the operation method including: receiving a message indicating configuration and activation of MBS SPS from a base station (BS); storing resource allocation information and hybrid automatic request (HARQ) information for the MBS SPS in a media access control (MAC) layer; initializing or re-initializing a resource configured for the MBS SPS in the MAC layer; and transmitting, to the BS, confirmation message of the activation and configuration of the MBS SPS.