Multi-Carrier TDRA Index for Cross-Carrier Scheduling

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Solution Overview

Problem

In 5G cellular systems, cross-carrier scheduling for Physical Downlink Shared Channels (PDSCHs) lacks clear definition of signaling parameters when a single Downlink Control Information (DCI) schedules multiple PDSCHs, leading to ambiguity and inefficiency in control signaling.

Innovation Solution

The method involves a User Equipment (UE) receiving DCI in a first Component Carrier that schedules PDSCHs in different Component Carriers, using a multi-carrier Time Domain Resource Allocation (TDRA) index to retrieve TDRA from a multi-carrier TDRA table, and transmitting Physical Uplink Control Channel (PUCCH) based on a K1 timing parameter, with the UE configured by a network node to determine the PUCCH slot and resource.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a single DCI schedules multiple PDSCHs in different carriers, then control signaling overhead is reduced, but signaling parameter definition becomes ambiguous

Engineering Contradiction:

Improvecontrol signaling overheadVSAvoidsignaling parameter definition

Core Design Contradiction:

Loss of energyVSLoss of information

Solution Approach 1:

The patent segments the scheduling information by introducing separate DCI formats for single-carrier and multi-carrier scheduling. For multi-carrier scheduling, it divides the parameter definition into two parts: common parameters applicable to all scheduled cells and cell-specific parameters for each scheduled cell, thereby eliminating ambiguity while maintaining overhead reduction

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism through the multi-carrier TDRA table that maps the compact multi-carrier TDRA index to detailed time domain resource allocation information for each scheduled cell. This intermediary structure enables unambiguous parameter definition without requiring separate DCI for each cell

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of information

If separate DCI is used for each PDSCH scheduling, then signaling parameter definition is clear, but control signaling overhead increases

Engineering Contradiction:

Improvesignaling parameter definitionVSAvoidcontrol signaling overhead

Core Design Contradiction:

Loss of informationVSLoss of energy

Solution Approach 1:

The patent merges the scheduling of multiple PDSCHs into a single DCI format for multi-carrier scheduling, combining the scheduling information for multiple cells into one control message. This merging approach reduces control signaling overhead while maintaining clear parameter definition through the structured parameter organization and multi-carrier TDRA table

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20230284219A1Signaling and scheduling in carrier aggregation with multiple serving cells

Publication Date: 2023.09.07 SAMSUNG ELECTRONICS CO LTD

AI summary

A system and a method are disclosed for signaling and scheduling in carrier aggregation with multiple serving cells. In some embodiments, the method includes: receiving, by a User Equipment (UE), in a first Component Carrier (CC), a Downlink Control Information (DCI), the DCI scheduling a first Physical Downlink Shared Channel (PDSCH) in a second CC, and a second PDSCH in a third CC, the second CC and the third CC being different, the DCI including a multi-carrier Time Domain Resource Allocation (TDRA) index; retrieving, based on the multi-carrier TDRA index, from a multi-carrier TDRA table stored by the UE, a TDRA for the first PDSCH and a TDRA for the second PDSCH; and receiving, by the UE, the first PDSCH, using time domain resources for PDSCH reception based on the retrieved TDRA for the first PDSCH.