ACK Feedback for SPS Reactivation DCI

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Solution Overview

Problem

Current wireless communication systems lack effective methods for acknowledging the successful reception of reactivation downlink control information (DCI) in semi-persistent scheduling, leading to uncertainties in UE configuration updates and potential communication failures.

Innovation Solution

The proposed solution involves a UE that receives reactivation DCI with an updated uplink feedback parameter, changes transmission parameters such as delays or resource configurations, and transmits feedback indicating successful reception, allowing the BS to confirm receipt and decode of the reactivation DCI.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the BS transmits reactivation DCI to change SPS configuration, then the UE configuration is updated, but the BS cannot determine whether the UE has received the reactivation DCI

Engineering Contradiction:

ImproveSPS configuration update capabilityVSAvoidReception confirmation reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements an acknowledgment mechanism where the UE sends feedback (ACK/NACK) to the BS to confirm receipt of reactivation DCI. The feedback is transmitted on uplink control resources, allowing the BS to determine whether the UE successfully received and decoded the reactivation DCI, thereby resolving the reliability issue while maintaining configuration update capability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary feedback message as a mediator between the reactivation DCI transmission and the configuration update. This feedback message carries acknowledgment information that enables the BS to verify UE reception status without directly modifying the SPS configuration mechanism itself

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the UE transmits ACK/NACK for SPS reactivation DCI, then the BS can confirm receipt, but additional uplink control resources are required

Engineering Contradiction:

ImproveReception confirmation reliabilityVSAvoidUplink control resource complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent makes existing uplink control resources multi-functional by enabling them to carry both traditional uplink control information and ACK/NACK feedback for reactivation DCI. This allows the same uplink control resources to serve multiple purposes, reducing the need for additional dedicated resources while maintaining reliable reception confirmation

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the ACK/NACK feedback transmission with existing uplink control information transmission. By combining these functions into a unified uplink control resource framework, the system achieves reception confirmation without significantly increasing overall resource complexity

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11477775B2Methods and apparatus for ACK for SPS reactivation DCI

Publication Date: 2022.10.18 QUALCOMM INC

AI summary

Aspects of the present disclosure include methods, apparatuses, and computer readable media for receiving a reactivation downlink control information (DCI) associated with a new periodic resource configuration and an updated uplink feedback parameter for a scheduled uplink control information transmission, receiving downlink control information, changing a transmission parameter of the scheduled uplink control information transmission based on the updated uplink feedback parameter, and transmitting the scheduled uplink control information transmission based on the changed transmission parameter to indicate uplink feedback regarding reception of the reactivation DCI.