Uplink Grant for Consecutive Subframes With Per-Subframe Power Control

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing uplink transmissions across multiple carriers, particularly in scenarios involving carrier aggregation and licensed assisted access, where unlicensed spectrum is utilized, leading to inefficiencies in resource allocation and interference management.

Innovation Solution

The implementation of an uplink grant mechanism that includes a power control command for adjusting transmission power across consecutive uplink subframes, allowing for optimized power management and resource allocation in multicarrier systems, including licensed and unlicensed bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a single uplink grant is used for multiple consecutive subframes, then signaling overhead is reduced and resource allocation efficiency is improved, but power control precision and interference management become more difficult

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidpower control precision

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the power control command into multiple independent fields (first power control command for first subframe, second power control command for second subframe) within a single uplink grant. This allows the system to maintain the efficiency benefit of a single grant while achieving the precision benefit of individual power control for each subframe through separate command fields.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter structure of the uplink grant by incorporating multiple power control command fields with different values for different subframes. This enables dynamic power adjustment per subframe while maintaining the unified grant structure, thus improving both efficiency and precision simultaneously.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If transmission power is increased across multiple subframes, then data throughput is improved, but interference to other cells and uplink synchronization become more difficult to maintain

Engineering Contradiction:

Improvedata throughputVSAvoidinterference to other cells

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different power control commands to different subframes, allowing the transmission power to be optimized locally for each subframe's specific conditions. This enables high throughput when channel conditions are good while reducing power (and interference) when conditions are poor or when other cells are affected.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamic power adjustment across subframes through multiple power control commands, allowing the system to adapt transmission power to changing channel conditions and interference levels. This dynamic approach maintains high throughput while minimizing interference through adaptive power control.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If separate uplink grants are used for each subframe, then power control precision is improved, but signaling overhead increases and resource allocation efficiency decreases

Engineering Contradiction:

Improvepower control precisionVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple power control commands into a single uplink grant message, combining the benefits of individual subframe power control with the efficiency of unified grant signaling. This reduces signaling overhead compared to separate grants while maintaining power control precision through multiple command fields within the unified grant.

Inventive Principle:

Principle #5Merging (Combining)

4Quantity of substance

If unlicensed spectrum is used for carrier aggregation, then available bandwidth is increased, but interference management and channel access complexity increase

Engineering Contradiction:

Improveavailable bandwidthVSAvoidinterference management complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms through multiple power control commands that respond to channel conditions in unlicensed spectrum. This allows the system to manage interference effectively in carrier aggregation scenarios by adjusting power based on feedback from channel quality indicators and interference measurements across multiple subframes.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12381661B2Uplink grant for consecutive uplink subframes in a wireless device

Publication Date: 2025.08.05 HONDA MOTOR CO LTD

AI summary

An uplink grant is received. The uplink grant comprises: a field indicating a number of consecutive uplink subframes; an assignment of resource blocks comprising subcarriers; and a power control command. A determination is made of a transmission power of transport blocks in each subframe of the consecutive uplink subframes based on the power control command. The transmission power in each subframe is adjusted based on a total transmit power in each subframe exceeding a power value in each subframe. Transport blocks are transmitted, using the transmission power, via the subcarriers across each of the consecutive uplink subframes.