MPDCCH Resource Assignment for Same- and Cross-Subframe PDSCH

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing resource assignment methods for Machine-Type Communication (MTC) terminals in LTE-Advanced systems are inefficient, requiring two steps of resource identification and lacking clear information on how resource assignment is contained in DCI, which affects flexibility and coverage.

Innovation Solution

A base station and terminal configuration that uses DCI to efficiently notify resource assignment information by associating resource assignment bits with resources used in the same or different subframes, allowing flexible and efficient resource allocation for MTC terminals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If two steps of resource identification are used for MTC terminals, then resource assignment can be performed, but device complexity increases and efficiency decreases

Engineering Contradiction:

Improveresource assignment efficiencyVSAvoidresource identification steps

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the narrowband identification and PRB identification steps into a single resource indication value (RIV) field in DCI. The RIV directly indicates the starting PRB and length of the resource allocation within the narrowband, eliminating the need for separate identification steps and reducing protocol complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The resource indication value (RIV) serves multiple functions simultaneously: it indicates the starting position of the resource allocation, specifies the length of the allocation, and implicitly defines the narrowband boundaries. This multi-functional field reduces the overall information required for resource assignment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If resource assignment bits are associated with resources in both same-subframe and different-subframe cases, then adaptability improves, but device complexity increases

Engineering Contradiction:

Improveresource assignment flexibilityVSAvoidDCI processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent introduces a dynamic indication mechanism where the same RIV field is interpreted differently based on subframe relationships. When MPDCCH and PDSCH are in the same subframe, RIV indicates resources excluding MPDCCH PRBs. When in different subframes, RIV indicates all resources in the narrowband. This dynamic interpretation provides flexibility without requiring separate fields.

Inventive Principle:

Principle #15Dynamics

3Speed

If MPDCCH and PDSCH are allocated to the same subframe, then transmission speed improves, but loss of information increases due to resource conflicts

Engineering Contradiction:

Improvetransmission speedVSAvoidresource assignment information accuracy

Core Design Contradiction:

SpeedVSLoss of information

Solution Approach 1:

The patent extracts the MPDCCH occupied PRBs from the set of resources indicated by the RIV when same-subframe scheduling is used. By removing these conflicting resources from the PDSCH allocation, the system avoids resource collisions while maintaining fast same-subframe transmission capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12476757B2Base station, terminal, transmission method, and reception method for using PDCCH (physical downlink control channel) to indicate resource assignment for PDSCH (physical downlink shared channel)

Publication Date: 2025.11.18 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A resource assignment determiner determines a resource for a PDSCH intended for an MTC terminal, and a transmitter transmits an MPDCCH that includes resource assignment bits indicating the resource thus determined and transmits the PDSCH using the resource thus determined. The MPDCCH is a PDCCH intended for the MTC terminal. The resource assignment bits are associated with a resource that is used when the MPDCCH and the PDSCH are transmitted in the same subframe and a resource that is used when the MPDCCH and the PDSCH are transmitted in different subframes.