Peak Reduction Tones for Supplementary Uplink PAPR

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Solution Overview

Problem

Next-generation wireless communication systems face challenges in reducing peak to average power ratio (PAPR) on supplementary uplink carriers, particularly due to significant processing overhead in conventional peak reduction tone (PRT) selection and unknown PRT selection by user equipment (UE) to base stations, leading to increased signaling overhead and performance degradation.

Innovation Solution

The use of peak reduction tones (PRTs) on supplementary uplink (SUL) carriers, where PRT locations are arranged relative to data tones according to a predefined sequence, reduces PAPR by dynamically enabling or disabling PRTs based on traffic load and frequency band, and signaling PRT sequences between UE and base station to facilitate efficient power and time savings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional peak reduction tone (PRT) selection is used on supplementary uplink carriers, then PAPR reduction is achieved, but processing overhead increases significantly

Engineering Contradiction:

ImprovePAPRVSAvoidprocessing overhead

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by pre-defining PRT sequences and their corresponding PRT locations relative to data tones before transmission. The base station and UE are configured with these sequences in advance, eliminating the need for real-time PRT selection and reducing processing overhead during actual transmission while maintaining PAPR reduction effectiveness.

Inventive Principle:

Principle #10Preliminary action

2Loss of energy

If UE selects PRT locations dynamically, then PAPR reduction performance improves, but signaling overhead between UE and base station increases

Engineering Contradiction:

ImprovePAPRVSAvoidsignaling overhead

Core Design Contradiction:

Loss of energyVSLoss of information

Solution Approach 1:

The patent inverts the conventional approach by having the base station and UE agree on predefined PRT sequences rather than having UE dynamically select and signal PRT locations. This reversal eliminates the need for uplink signaling of PRT location information, reducing signaling overhead while maintaining PAPR reduction through the use of these predetermined sequences.

Inventive Principle:

Principle #13The other way round (Inversion)

3Loss of energy

If PRTs are always enabled on SUL carrier, then PAPR is reduced, but power efficiency decreases due to unnecessary transmissions

Engineering Contradiction:

ImprovePAPRVSAvoidpower efficiency

Core Design Contradiction:

Loss of energyVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by enabling PRTs conditionally based on traffic load and frequency band characteristics rather than always enabling them. The system dynamically activates or deactivates PRT transmission according to current network conditions, optimizing the balance between PAPR reduction and power efficiency by avoiding unnecessary PRT transmissions when they are not needed.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4189906B1Peak to average power ratio reduction for supplementary uplink

Publication Date: 2024.12.11 QUALCOMM INC

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AI summary

Aspects relate using peak reduction tones on a supplementary uplink to reduce peak to average power ratio on the supplementary uplink. For example, when a UE elects to switch from a primary carrier (e.g., a 5G NR carrier) to an SUL carrier (e.g., in a limited coverage scenario), the UE may use a defined set of PRTs to transmit data on the SUL carrier. In some examples, PRTs may be used on multiple carriers. For example, a first set of PRTs may be defined for an SUL carrier and a second set of PRTs may be defined for another carrier.