Wireless Resource Allocation Using Asymmetric Subcarrier Sets

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

In wireless communication systems, existing resource allocation methods face challenges in maximizing frequency diversity gain and reducing interference between base stations, particularly when allocating subcarrier sets with consecutive offset values, which can lead to decreased performance and increased Peak-to-Average Power Ratio (PAPR).

Innovation Solution

The method involves dividing subcarriers into subcarrier sets with consecutive subcarriers, generating a resource index table with maximized distance between subcarriers, and using unique information for each base station to create distinct resource allocation tables, thereby maximizing frequency diversity and reducing interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If subcarrier sets with consecutive offset values are allocated to terminals, then resource allocation efficiency is improved, but frequency diversity gain is decreased and interference between base stations is increased

Engineering Contradiction:
Improveresource allocation efficiencyVSAvoidfrequency diversity gain
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent segments the frequency resources into multiple subcarrier sets with different offset values. Instead of allocating consecutive offset values to terminals, the system divides subcarriers into distinct sets (e.g., first subcarrier set with offset value 0, second subcarrier set with offset value 1) and allocates these segmented sets to different terminals. This segmentation enables frequency diversity by ensuring terminals receive subcarriers from different offset sets, thereby avoiding concentrated interference while maintaining allocation efficiency.

Inventive Principle:
Principle #1Segmentation

2Productivity

If subcarrier sets with consecutive offset values are allocated to terminals, then resource allocation efficiency is improved, but interference between base stations is increased

Engineering Contradiction:
Improveresource allocation efficiencyVSAvoidinterference between base stations
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces asymmetric offset values for different subcarrier sets (e.g., offset values of 0, 1, 2, 3 for different sets). By using asymmetric offset assignments rather than symmetric consecutive allocations, the system creates differentiated resource patterns across base stations. This asymmetry ensures that even though terminals receive consecutive resource indices, the actual subcarrier distributions remain diversified, reducing inter-base station interference while preserving allocation efficiency.

Inventive Principle:
Principle #4Asymmetry

3Reliability

If subcarriers are located at regular intervals for frequency diversity, then frequency diversity gain is improved, but Peak-to-Average Power Ratio (PAPR) increases

Engineering Contradiction:
Improvefrequency diversity gainVSAvoidPeak-to-Average Power Ratio (PAPR)
Core Design Contradiction:
ReliabilityVSStress or pressure

Solution Approach 1:

The patent applies local quality by assigning different offset values to different subcarrier sets, creating localized frequency shifts. Instead of uniformly distributing all subcarriers at regular intervals across the entire band, the system creates local frequency clusters at different offsets (e.g., first subcarrier set at offset 0, second at offset 1). This localized approach maintains frequency diversity within each set while the overall regular interval structure controls PAPR, achieving a balance between diversity gain and power ratio management.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS8116390B2Apparatus and method for allocating resources and performing communication in a wireless communication system
Publication Date: 2012.02.14 SAMSUNG ELECTRONICS CO LTD
  • US8116390B2 patent drawing
  • US8116390B2 patent drawing
  • US8116390B2 patent drawing

AI summary

Disclosed is a method for allocating resources in a base station of a wireless communication system that performs communication using frequency resources. The method includes dividing subcarriers into subcarrier sets each including a predetermined number of consecutive subcarriers, and generating a resource index table mapped to consecutive indexes such that a distance between subcarriers in the subcarrier sets is maximized; and determining an amount of resources to be transmitted through a downlink according to a channel condition, for data to be transmitted to each terminal, and allocating resources to the terminal using the index value in the resource index table.