ePDCCH Resource Mapping for Multi-Carrier LTE Scheduling

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Solution Overview

Problem

Current communication systems, such as LTE/LTE-Advanced, lack an efficient ePDCCH design for multiple carrier systems, leading to performance limitations, frame errors, and inadequate PDSCH and CSI reporting processing times, especially in quasi-collated antenna port scenarios.

Innovation Solution

Implement systems and methods for enhanced ePDCCH in multiple carrier systems, including localized and distributed resource allocation, flexible processing times, cross-carrier scheduling, and adaptive eREG-to-eCCE mapping, with support for multiple antennas and quasi-collated antenna ports.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If ePDCCH design is focused on single component carrier, then single carrier performance is maintained, but multiple carrier system performance is limited

Engineering Contradiction:

Improvemultiple carrier supportVSAvoidframe error rate

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The ePDCCH design is segmented to operate independently on each component carrier while maintaining individual frame structures. Each carrier's ePDCCH resources are separately configured and monitored, allowing multi-carrier operation without compromising the reliability of individual carrier transmissions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent extends the single-carrier ePDCCH design into the multi-carrier dimension by introducing cross-carrier scheduling mechanisms and carrier-specific ePDCCH resource configurations. This dimensional extension enables simultaneous operation across multiple carriers while preserving the reliability characteristics of single-carrier designs.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If ePDCCH is designed for single carrier, then design complexity is reduced, but it cannot support quasi-collated antenna ports properly

Engineering Contradiction:

Improvequasi-collated antenna port supportVSAvoidePDCCH design complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The ePDCCH design is made universal to support both single-carrier and multi-carrier operations, as well as various antenna port configurations including quasi-collated ports. The same basic ePDCCH structure and processing mechanisms are used across different carrier and antenna scenarios, reducing the need for separate specialized designs while maintaining support for advanced features.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If PDSCH and CSI reporting processing times are tightened for ePDCCH, then system throughput is improved, but processing reliability decreases

Engineering Contradiction:

Improvesystem throughputVSAvoidprocessing reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The processing times for PDSCH and CSI reporting are made dynamic rather than fixed. The system can adaptively adjust processing time requirements based on current channel conditions, traffic load, and UE capabilities. This dynamic approach enables throughput optimization when conditions permit while maintaining sufficient processing time for reliability when needed.

Inventive Principle:

Principle #15Dynamics

4Adaptability or versatility

If ePDCCH monitoring is configured on every subframe, then scheduling flexibility is improved, but processing time constraints are tightened

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidprocessing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

Instead of continuous ePDCCH monitoring on every subframe, the system employs periodic monitoring configurations where ePDCCH is monitored at specific intervals or in specific subframe patterns. This periodic approach maintains scheduling flexibility by allowing configuration of monitoring periods adapted to traffic patterns while providing UEs with sufficient processing time between monitoring occasions.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP2807784B1Systems and/or methods for providing epdcch in a multiple carrier based and/or quasi-collocated network

Publication Date: 2026.03.04 INTERDIGITAL PATENT HOLDINGS INC

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AI summary

ePDCCH may be provided. For example, a WTRU may receive a configuration for monitoring an ePDCCH resource. Based on the configuration, the WTRU may be configured to monitor and may monitor the ePDCCH resource on a particular subframe. Additionally, a WTRU may derive an aggregation level for a subframe associated with an aggregation level number NAL. The WTRU may transmit or monitor an ePDCCH using the aggregation level associated with the NAL for the subframe. A WTRU may also receive a reference signal. The WTRU may then determine the type of reference signal received. The WTRU may perform a demodulation of the PDSCH or ePDCCH using a demodulation timing based on the determined type. The ePDCCH or PDSCH may also be monitored or received by identifying a demodulation reference timing implicitly based on a location of one or more ePDCCH resources where the WTRU may receive DCI.