Multi-Subframe Scheduling via Single DCI for LTE Control Overhead

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Solution Overview

Problem

In LTE systems, dynamic scheduling is inefficient for low-speed mobile users with continuous data transmission, leading to high control overhead, and semi-persistence scheduling is limited by a maximum modulation and coding scheme (MCS) of 15, restricting data volume support.

Innovation Solution

A multi-subframe scheduling method where a base station schedules multiple subframes through a single DCI, allowing users to receive or send data based on acquired scheduling parameters, reducing control overhead and enhancing spectrum efficiency for larger data volumes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If dynamic scheduling is used for low-speed mobile users with continuous data transmission, then scheduling flexibility is improved, but control overhead increases

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidcontrol overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent merges multiple subframe scheduling operations into a single DCI message. Instead of sending separate DCI for each subframe, the base station combines scheduling information for multiple subframes (e.g., 4 subframes) into one DCI, reducing control overhead while maintaining scheduling flexibility for continuous data transmission

Inventive Principle:

Principle #5Merging (Combining)

2Quantity of substance

If semi-persistence scheduling is used to reduce control overhead, then control overhead is reduced, but data volume support is limited by maximum MCS of 15

Engineering Contradiction:

Improvecontrol overheadVSAvoiddata volume support

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent introduces dynamic adaptability to semi-persistent scheduling by allowing the base station to adjust MCS values beyond the traditional maximum of 15. The system dynamically selects appropriate MCS from an expanded range (e.g., up to MCS 27) based on channel conditions and data requirements, enabling support for larger data volumes while maintaining reduced control overhead

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the MCS parameter range from the traditional maximum of 15 to an extended range (e.g., MCS 0-27). This parameter change allows the system to support higher data volumes and improved spectral efficiency while still utilizing the benefits of semi-persistent scheduling for reducing control overhead

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If multiple DCI are sent for scheduling multiple subframes, then scheduling precision is improved, but control overhead increases

Engineering Contradiction:

Improvescheduling precisionVSAvoidcontrol overhead

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent segments the scheduling information within a single DCI message to maintain precision. Instead of sending one bulky DCI with all details, the system divides scheduling information into structured fields (resource allocation, MCS, timing indicators for each subframe) within the single DCI, achieving both precision and overhead reduction

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS9877341B2Multi-subframe scheduling method, device and system

Publication Date: 2018.01.23 ADVANCED STANDARD COMM LLC

AI summary

A multi-subframe scheduling method, device and system are disclosed. The method includes: a base station side scheduling transmission of a plurality of subframes through a piece of downlink control information DCI; and according to an acquired multi-subframe scheduling mode and scheduling parameters, a user equipment UE receiving and sending the plurality of subframes according to an indication of the DCI.