MBS Semi-Persistent Scheduling for Lower PDCCH Overhead
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in using resources for multicast and broadcast services due to the inefficient use of physical downlink control channel resources in semi-persistent scheduling (SPS) operations.
Innovation Solution
A method and device for MBS SPS operation in wireless communication systems, involving a user equipment (UE) that receives configuration and activation messages from a base station, stores resource allocation and HARQ information, and initializes or re-initializes MBS SPS resources in the MAC layer, with confirmation messages transmitted to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is used for periodic broadcast services, then resource allocation efficiency is improved, but physical downlink control channel resource consumption increases
Solution Approach 1:
The patent extracts the scheduling control information from the physical downlink control channel and moves it to the physical downlink shared channel. Specifically, the network device sends SPS activation indication information and SPS release indication information through PDSCH rather than PDCCH, thereby reducing control channel resource consumption while maintaining SPS functionality for periodic broadcast services
Solution Approach 2:
The patent changes the dimension of resource allocation by introducing group-based resource allocation for multiple UEs. Instead of allocating resources individually to each UE, the network device allocates PDSCH resources to a group of UEs simultaneously, and each UE receives data according to its specific configuration within that group, thereby improving overall resource allocation efficiency
2Measurement precision
If individual resource allocation is used for each UE, then resource allocation precision is improved, but system complexity increases
Solution Approach 1:
The patent merges the resource allocation process by grouping multiple UEs together for joint PDSCH resource allocation. The network device sends a single group PDSCH resource allocation to multiple UEs in a group, reducing the number of individual allocation operations while maintaining precise resource assignment for each UE through group-specific configuration parameters
3Adaptability or versatility
If dynamic scheduling is used for periodic services, then flexibility is improved, but control channel overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring SPS parameters including periodicity, resource allocation, and modulation schemes before actual data transmission. The network device sends SPS configuration information containing all necessary parameters in advance, allowing UEs to autonomously receive periodic broadcast services without requiring continuous dynamic scheduling commands, thereby reducing control channel overhead while maintaining flexibility
Solution Approach 2:
The patent implements periodic action through semi-persistent scheduling where resources are allocated periodically for broadcast services. Instead of sending dynamic scheduling commands for each transmission, the system establishes periodic resource allocation patterns that automatically repeat, reducing the frequency of control channel transmissions while maintaining service continuity
Data Source
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.