Transmit Chain Carrier Scheduling for PAPR-Limited Aggregation

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Solution Overview

Problem

In wireless communication systems, particularly in carrier aggregation, the peak-to-average power ratio (PAPR) of combined waveforms degrades as more component carriers (CCs) are added, leading to inefficiencies and throughput reduction due to limited transmit chains.

Innovation Solution

Limiting the quantity of CCs scheduled concurrently on each transmit chain based on modulation order, relative power, and bandwidth to maintain optimal PAPR, thereby improving throughput.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the quantity of component carriers scheduled concurrently on a transmit chain is increased to improve throughput, then the data transmission capacity is improved, but the peak-to-average power ratio (PAPR) of the combined waveforms degrades

Engineering Contradiction:

ImprovethroughputVSAvoidpeak-to-average power ratio

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the maximum quantity of CCs based on modulation order, relative power, and bandwidth parameters. When PAPR degradation is detected or predicted, the system changes these parameters to reduce the number of concurrent CCs, thereby optimizing the balance between throughput and PAPR performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics by making the maximum quantity of CCs a dynamic parameter rather than a fixed value. The network entity and UE adapt the CC quantity in real-time based on current channel conditions, modulation schemes, and power constraints, allowing the system to respond to changing conditions and maintain optimal PAPR while maximizing throughput

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If the maximum quantity of component carriers is limited to maintain optimal PAPR, then the peak-to-average power ratio is improved, but the throughput is reduced

Engineering Contradiction:

Improvepeak-to-average power ratioVSAvoidthroughput

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent applies partial action by scheduling fewer than the maximum possible CCs when PAPR constraints are active. Instead of always maximizing CC quantity, the system schedules a partial set that maintains optimal PAPR, and only utilizes additional CCs when conditions permit, thus achieving acceptable throughput while protecting against PAPR degradation

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20260059517A1Maximum quantity of scheduled component carriers for transmit chain

Publication Date: 2026.02.26 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain an indication of a maximum quantity of component carriers (CCs), that each carry a carrier waveform, that are to be scheduled concurrently on a transmit chain for carrier aggregation. The UE may schedule a quantity of CCs to carry carrier waveforms concurrently on the transmit chain such that the quantity of CCs does not exceed the maximum quantity of CCs. The UE may transmit communications corresponding to the carrier waveforms. Numerous other aspects are described.