Selective Phase Rotation for Wireless Bandwidth Indication

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless communication systems, particularly in dynamic bandwidth allocation, the peak to average power ratio (PAPR) of the signaling (SIG) field can be problematic due to inflexible phase rotation applications, which affect the efficient utilization of frequency resources.

Innovation Solution

A method and apparatus where a wireless device selectively applies phase rotation to physical protocol data units (PPDUs) based on bandwidth indication, using a TXVECTOR parameter for bandwidth exchange, and includes a one-bit DYN_BANDWIDTH indicator in the SIG field to distinguish between dynamic and static bandwidth allocation, allowing phase rotation only when necessary.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If phase rotation is applied in dynamic bandwidth allocation, then frequency resource utilization is improved, but PAPR of the SIG field increases causing transmission problems

Engineering Contradiction:

Improvefrequency resource utilizationVSAvoidPAPR of SIG field

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies phase rotation selectively only to specific subcarriers (nonsingular subcarriers) rather than all subcarriers uniformly. By identifying and excluding singular subcarriers from phase rotation application, the method maintains frequency resource utilization benefits while avoiding PAPR increase in the SIG field.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent dynamically determines which subcarriers receive phase rotation based on real-time channel conditions and bandwidth allocation requirements. The phase rotation is applied conditionally rather than statically, allowing the system to adapt to varying transmission conditions and avoid PAPR issues while maintaining efficiency.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If phase rotation is applied flexibly based on bandwidth indication, then system adaptability to interference is improved, but device complexity increases

Engineering Contradiction:

Improvesystem adaptability to interferenceVSAvoidprocessing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the frequency spectrum into different subcarrier groups, applying phase rotation only to nonsingular subcarriers while leaving singular subcarriers unaffected. This segmentation approach enables selective adaptation to interference without requiring complex processing across the entire bandwidth.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a bandwidth indication mechanism that acts as an intermediary to control phase rotation application. This mediator provides explicit guidance on when and where to apply phase rotation, simplifying the decision-making process and reducing overall system complexity while maintaining adaptability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS9374736B2Apparatus and method of indicating bandwidth in wireless communication system

Publication Date: 2016.06.21 ELECTRONICS & TELECOMM RES INST

AI summary

The phase rotation relates to an apparatus and method of indicating a bandwidth in a wireless communication system. This disclosure discloses a wireless device comprising a transmission transmitting and receiving a wireless signal and a processor operating in operative connection with the transmission, wherein the processor generates a PPDU (physical protocol data unit) to which a phase rotation application is selectively applied depending on a case of bandwidth indication or a case of no bandwidth indication.