GC-PDCCH Feedback Resource Allocation for MBMS

Solution Overview

Problem

In wireless communication systems, particularly in multimedia broadcast multicast services (MBMS) using group common-physical data shared channels (GC-PDSCHs), feedback collisions occur when multiple user equipment (UEs) transmit feedback over the same resources, leading to increased network overhead and interference.

Innovation Solution

A method where a base station transmits a granting GC-PDCCH to schedule MBMS transmissions and a triggering GC-PDCCH to allocate separate feedback resources for each UE, allowing them to transmit feedback reports without collisions by indicating respective feedback resources for each UE.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a GC-PDCCH identifies common feedback resources for a group of UEs, then the device complexity is reduced and ease of operation is improved, but feedback collisions occur and network overhead increases

Engineering Contradiction:

Improvefeedback resource allocationVSAvoidnetwork overhead

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent segments the common feedback resources into UE-specific feedback resources. The GC-PDCCH no longer identifies a single common feedback resource for the entire group, but rather enables each UE to be allocated separate feedback resources within the group, thereby eliminating feedback collisions while maintaining simplified operation through group-based management.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If a GC-PDCCH identifies common feedback resources for a group of UEs, then the device complexity is reduced and ease of operation is improved, but feedback collisions occur and interference increases

Engineering Contradiction:

Improvefeedback resource allocationVSAvoidfeedback interference

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent segments the common feedback resources into UE-specific feedback resources. The GC-PDCCH no longer identifies a single common feedback resource for the entire group, but rather enables each UE to be allocated separate feedback resources within the group, thereby eliminating feedback collisions while maintaining simplified operation through group-based management.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If common feedback resources are used by a group of UEs, then ease of operation is improved, but the reliability of feedback transmission deteriorates due to collisions

Engineering Contradiction:

Improvefeedback resource allocationVSAvoidfeedback transmission

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent segments the common feedback resources into UE-specific feedback resources. The GC-PDCCH no longer identifies a single common feedback resource for the entire group, but rather enables each UE to be allocated separate feedback resources within the group, thereby eliminating feedback collisions while maintaining simplified operation through group-based management.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic feedback resource allocation where the GC-PDCCH can flexibly assign different feedback resources to different UEs based on current network conditions and UE requirements. This dynamic allocation ensures reliable feedback transmission while adapting to changing operational needs.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11902999B2Group common-physical downlink control channel (GC-PDCCH) for triggering feedback for multimedia broadcast multicast service (MBMS) group common-physical data shared channels (GC-PDSCHs)

Publication Date: 2024.02.13 QUALCOMM INC

AI summary

A method for wireless communication performed by a user equipment (UE) includes receiving, from a base station on a granting group common (GC)-physical downlink control channel (PDCCH), a multimedia broadcast multicast service (MBMS) downlink grant that schedules an MBMS transmission at each UE of a group of UEs that includes the UE. The method also includes receiving, from the base station on a triggering GC-PDCCH, a message indicating respective feedback resources for each UE of the group of UEs. The method further includes receiving, from the base station, the MBMS transmission. The method still further includes transmitting, to the base station via the feedback resources, a feedback report based on receiving the MBMS transmission.