Semi-Static HARQ Codebook Creation for Unicast and Multicast Services

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Solution Overview

Problem

Existing New Radio (NR) technology lacks a comprehensive method to determine candidate Physical Downlink Shared Channel (PDSCH) reception occasions for both unicast and multicast/broadcast services, given different time domain resource allocation tables and HARQ feedback timing values, which affects the reliability and efficiency of Hybrid Automatic Repeat Request (HARQ) feedback.

Innovation Solution

A method and device for creating a semi-static HARQ codebook that determines candidate PDSCH reception occasions and bit length based on multiple time domain resource allocation tables and HARQ feedback timing values, including unicast and multicast/broadcast specific tables, to unify resource allocation and improve HARQ feedback reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple time domain resource allocation tables and HARQ feedback timing values are configured for both unicast and multicast/broadcast services, then the adaptability and versatility of the system is improved, but the device complexity and difficulty of determining candidate PDSCH reception occasions increases

Engineering Contradiction:

Improvesupport for both unicast and multicast/broadcast servicesVSAvoidcomplexity of determining candidate PDSCH reception occasions

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the determination of candidate PDSCH reception occasions into distinct steps: first determining the set of occasions based on multiple time domain resource allocation tables (including both unicast and multicast/broadcast specific tables), then separately determining the bit length of the HARQ-ACK codebook. This segmentation allows the system to handle multiple service types with different configuration parameters without creating a monolithic complex determination process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a universal determination method that works for both unicast and multicast/broadcast services. The set of candidate PDSCH reception occasions is determined in a unified manner that accommodates different service types, UE capabilities, and configuration scenarios, allowing the same procedural framework to serve multiple functions rather than requiring separate determination processes for each service type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If a unified method is used to determine candidate PDSCH reception occasions for both unicast and multicast/broadcast services, then the ease of operation is improved, but the manufacturing precision and accuracy of HARQ feedback determination may be compromised

Engineering Contradiction:

Improvesimplicity of HARQ codebook creation processVSAvoidprecision of HARQ feedback bit length determination

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent applies local quality by allowing different determination approaches within the unified framework based on specific service types and UE capabilities. The system can selectively apply different rules for determining candidate occasions depending on whether the service is unicast or multicast/broadcast, and depending on UE capability indicators, thus maintaining precision for each specific case while using a single overall procedure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The determination method is dynamic and adaptable to different scenarios. The system can adjust which time domain resource allocation tables are applied and how candidate occasions are determined based on UE capability indicators and service type, allowing the precision of the determination to vary appropriately for different operational contexts while maintaining a unified overall approach.

Inventive Principle:

Principle #15Dynamics

3Reliability

If separate time domain resource allocation tables are used for unicast and multicast/broadcast services, then the reliability of service-specific optimization is improved, but the loss of information and overhead increases

Engineering Contradiction:

Improveservice-specific resource allocation optimizationVSAvoidHARQ feedback overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges the determination of candidate PDSCH reception occasions for both unicast and multicast/broadcast services into a single unified set of occasions. By combining the candidate occasions from different service types into one unified determination, the system avoids redundant HARQ feedback bits and reduces overall feedback overhead while still maintaining service-specific optimization through the use of different time domain resource allocation tables for different services.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20240163028A1Method and device for creating semi-static HARQ codebook, apparatus and readable storage medium

Publication Date: 2024.05.16 CHINA MOBILE COMM GRP CO LTD

AI summary

The present disclosure provides a method and a device for creating a semi-static HARQ codebook, an apparatus and a readable storage medium. The method includes determining a set of candidate PDSCH reception occasions and/or a bit length of an HARQ-ACK codebook based on first configuration information. In the present disclosure, the quantity of occasions for candidate PDSCH receptions in the set of occasions for candidate PDSCH receptions is determined based on a type of a time domain resource allocation table, so as to save HARQ-ACK information bits.