Multi-Slot Multicast SPS for Quasi-Periodic Packet Bursts
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Solution Overview
Problem
Existing wireless communication systems struggle to efficiently support bursty traffic patterns, particularly for virtual reality (VR) and extended reality (XR) applications, as they often only support unicast semi-persistent scheduling (SPS) with single PDSCH occasions, which are inadequate for quasi-periodic packet bursts.
Innovation Solution
Implementing multi-cast SPS with multi-slot PDSCH occasions, allowing for separate configuration from unicast SPS and enabling repetition or retransmissions of transport blocks, with varying modulation and coding schemes, and feedback mechanisms for improved reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unicast SPS with single PDSCH occasions is used, then system complexity is reduced, but the ability to support bursty traffic patterns for VR/XR applications is insufficient
Solution Approach 1:
The patent segments the single PDSCH occasion into multiple PDSCH occasions within the SPS period, allowing transport blocks to be distributed across multiple reception opportunities. This segmentation enables the system to handle bursty traffic patterns by spreading transmissions over multiple slots, thereby improving adaptability without requiring a complete system redesign.
Solution Approach 2:
The patent introduces dynamic feedback mechanisms where UEs can indicate successful or unsuccessful reception of transport blocks, allowing the network to adaptively retransmit only the necessary blocks. This dynamic adjustment optimizes resource usage for bursty traffic while maintaining manageable system complexity through selective retransmission.
2Productivity
If multiple PDSCH occasions are configured for multi-cast SPS, then reception efficiency for quasi-periodic packet bursts is improved, but control signaling complexity increases
Solution Approach 1:
The patent configures multiple PDSCH occasions in advance within the SPS period, allowing UEs to prepare for potential retransmissions without requiring real-time scheduling decisions. This preliminary configuration improves reception efficiency for quasi-periodic traffic while reducing the burden on dynamic control signaling.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report reception status of each transport block, enabling the network to make informed retransmission decisions. This feedback-driven approach optimizes resource allocation by retransmitting only failed blocks, thereby improving productivity while keeping control signaling complexity manageable through targeted communication.
3Reliability
If separate configuration is used for multi-cast SPS with multi-slot PDSCH, then reception reliability is improved, but configuration complexity increases
Solution Approach 1:
The patent separates the configuration of multi-cast SPS with multi-slot PDSCH from unicast SPS configurations, creating distinct parameter sets optimized for different traffic types. This segmentation improves reception reliability by tailoring configurations specifically for multi-cast bursty traffic while managing complexity through modular, dedicated configuration structures.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first control information indicative of a resource allocation for reception of periodic multi-slot multi-cast transmissions. In some aspects, the control information may indicate a semi-persistent scheduling (SPS) configuration for multi-cast, multi-slot signaling. The resource allocation may include a set of multiple reception occasions over a set of multiple slots. The UE may receive one or more transport blocks during the set of multiple reception occasions over the set of multiple slots. In some aspects, the UE may transmit feedback information for the one or more transport blocks.