Fixed TTI Bundling Mapping for MTC Link Budget Gain

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Solution Overview

Problem

Current wireless communication systems face inefficiencies in transmission time interval (TTI) bundling for machine type communications (MTC), particularly in achieving 20 dB link budget gain while managing power consumption and system efficiency.

Innovation Solution

The proposed solution involves enhanced TTI bundling design with fixed bundling sizes determined through one-to-one or one-to-many mappings, combined with persistent scheduling and early termination of transmissions upon successful reception, allowing for adjustments in modulation and coding schemes, rates, or transmit power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If large TTI bundling is used to achieve 20 dB link budget gain, then coverage is improved, but power consumption and system overhead increase

Engineering Contradiction:

Improvelink budget gainVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the bundling size adjustable rather than fixed. The system dynamically adapts the TTI bundling size based on channel conditions and device requirements, allowing devices to use smaller bundling sizes when possible to reduce power consumption while still achieving adequate coverage when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of bundling size from a fixed large value to a variable parameter that can be adjusted. By modifying the bundling size parameter based on specific transmission conditions, the system achieves link budget gain only when necessary, thereby reducing overall power consumption while maintaining reliability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If large TTI bundling is used to achieve 20 dB link budget gain, then coverage is improved, but system overhead increases

Engineering Contradiction:

Improvelink budget gainVSAvoidsystem overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system dynamically adjusts bundling size based on actual transmission needs rather than using a fixed large bundling size. This dynamic adaptation reduces system overhead by only applying extensive bundling when channel conditions require it, rather than universally applying large bundling sizes that increase overhead.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent modifies the bundling size parameter to be variable rather than fixed. By changing this parameter based on transmission conditions, the system achieves link budget improvements only when necessary, thereby reducing system overhead while maintaining the ability to provide 20 dB gain when required.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If fixed bundling sizes are used, then system complexity is reduced, but adaptability to different channel conditions deteriorates

Engineering Contradiction:

Improvesystem complexityVSAvoidadaptability to channel conditions

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamics by enabling the system to adapt bundling sizes based on channel conditions. The system can switch between different bundling size configurations dynamically, providing adaptability to varying channel conditions while maintaining manageable system complexity through standardized adaptation mechanisms.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the bundling size from a fixed parameter to a variable parameter that can be adjusted according to channel conditions. This parameter change enables the system to adapt to different transmission scenarios while maintaining system complexity at acceptable levels through structured parameter management.

Inventive Principle:

Principle #35Parameter changes

4Use of energy by moving object

If early termination of transmission is implemented, then power consumption is reduced, but transmission reliability may be affected

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies feedback by implementing early termination mechanisms that monitor transmission success in real-time. When successful reception is detected, the system provides feedback to terminate further transmissions, reducing power consumption while maintaining reliability through the feedback-driven decision-making process.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent uses partial action by allowing transmissions to be terminated early when successful reception is achieved. Instead of always completing the full bundled transmission sequence, the system performs only the necessary portion of transmission, reducing power consumption while maintaining transmission reliability through conditional early termination.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12308955B2Enhanced transmission time interval bundling design for machine type communications

Publication Date: 2025.05.20 QUALCOMM INC

AI summary

Aspects of the present disclosure provide techniques for enhanced transmission time interval (TTI) bundling design for machine type communications (MTC). A method for wireless communications by a wireless device is provided. The method generally includes determining a mapping of one or more uplink or downlink channels to one or more fixed bundling sizes, wherein each of the one or more fixed bundling sizes indicates a number of transmission time intervals (TTIs) over which a channel should be transmitted and processing transmission of the one or more uplink or downlink channels based on the mapping.