Semi-Persistent Scheduling PDSCH for NR Multicast Beam Selection

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing semi-persistent scheduling (SPS) physical downlink shared channels (PDSCH) for New Radio (NR) multicast services, particularly in ensuring reliable and high-throughput communication across multiple beams without increasing control signal traffic.

Innovation Solution

The method involves a user equipment (UE) receiving configurations for SPS PDSCH communications and determining satisfaction of reception conditions based on transmission configuration indicator (TCI) states, allowing selective receipt of SPS PDSCH communications and transmitting ACK/NACK feedback, while the base station transmits activation indications for multiple SPS PDSCH communications, facilitating reliable multicast without unnecessary control signal overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple SPS PDSCH communications are transmitted across multiple beams for NR multicast services, then reliability and throughput are improved, but control signal overhead increases

Engineering Contradiction:

Improvereliability of SPS PDSCH communicationsVSAvoidcontrol signal traffic

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The base station pre-configures multiple SPS PDSCH communications with different TCI states before actual data transmission. These pre-configured communications include predetermined beam directions and transmission parameters, allowing the UE to select from multiple pre-prepared options without requiring real-time control signaling for each beam selection, thus improving reliability while avoiding increased control overhead

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE autonomously determines which SPS PDSCH communication to receive by evaluating reception conditions (such as beam quality metrics) against the pre-configured options. This self-service mechanism allows the UE to independently select the most suitable beam without requiring continuous base station instructions, thereby maintaining high reliability across multiple beams while minimizing control signal traffic

Inventive Principle:

Principle #25Self-service

2Productivity

If UE receives all SPS PDSCH communications without selection, then throughput is maximized, but energy consumption and processing load increase

Engineering Contradiction:

Improvethroughput of multicast serviceVSAvoidenergy consumption of UE

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

Instead of requiring the UE to process all configured SPS PDSCH communications, the system implements partial action by allowing the UE to selectively receive only those communications that satisfy predetermined reception conditions. The UE evaluates each pre-configured SPS PDSCH against criteria such as beam quality and selects only the necessary subset for reception, thereby maintaining adequate throughput while significantly reducing energy consumption and processing load compared to receiving all communications

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If dynamic scheduling is used instead of SPS for multicast, then adaptability to channel conditions improves, but control signal overhead and latency increase

Engineering Contradiction:

Improveadaptability to channel conditionsVSAvoidcontrol signal traffic

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The system pre-configures multiple SPS PDSCH communications with different TCI states representing different beam directions and channel conditions. This preliminary configuration allows the system to maintain semi-persistent scheduling efficiency while adapting to varying channel conditions, as the pre-configured options cover multiple potential channel scenarios without requiring dynamic reconfiguration

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

While maintaining the semi-persistent nature of SPS, the system introduces dynamics by allowing the UE to select among multiple pre-configured SPS PDSCH communications based on current reception conditions. This dynamic selection mechanism enables adaptation to changing channel conditions without requiring dynamic scheduling overhead, as the adaptability is achieved through UE autonomy rather than base station control signaling

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11812447B2Semi persistent scheduling physical downlink shared channels for new radio multicast

Publication Date: 2023.11.07 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration indicating a plurality of semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) communications associated with a multicast service. The UE may receive, based at least in part on determining that a reception condition is satisfied, an SPS PDSCH communication of the plurality of SPS PDSCH communications. Numerous other aspects are provided.