Frame transmission system and method of interference alignment and controlling in multi-cell random access network

Patent metadata

Field	Value
Publication number	US-10045240-B2
Application number	US-201715805787-A
Country	US
Kind code	B2
Filing date	Nov 7, 2017
Priority date	Jun 20, 2014
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Provided is a frame transmission method of interference alignment (IA) and controlling, the method including calculating a channel matrix of a basic service set (BSS) by measuring channel information between an access point and a user terminal, performing singular value decomposition (SVD) based on the calculated channel matrix, selecting a beamforming vector in consideration of an interference amount associated with another access point based on the SVD performed by the channel matrix, and calculating a leakage interference (LIF) value based on the selected beamforming vector.

First claim

What is claimed is:

1. A frame transmission method of interference alignment (IA) and controlling, the method comprising:
verifying channel information associated with an adjacent channel;
receiving a receiving vector from an access point of the adjacent channel;
calculating an effective channel matrix using the verified channel information and the received receiving vector;
measuring an interference amount based on the calculated effective channel matrix; and
selecting a user terminal to which transmission is to be directed based on the measured interference amount.

2. The method of claim 1 , wherein the calculating comprises calculating the effective channel matrix by measuring the channel information comprising a sounding frame or a beacon frame periodically transmitted to the user terminal from the access point.

3. The method of claim 1 , wherein the calculating comprises transmitting desired signal space information comprising a null space and interference space information randomly generated for IA to the user terminal through the sounding frame or the beacon frame,
wherein the interference space information is information associated with an interference space allowing interference from user terminals in different cells, and
the desired signal space information is information associated with a space set by the access point to receive a signal.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Oh Jin Hyung
• Jung Bang Chul
• Jin Hu
• Song Myung Sun

Classifications

• H04W24/02 Primary

  Arrangements for optimising operational condition · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title

• H04W24/08 Primary

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W74/0833

  Random access procedures, e.g. with 4-step access · CPC title

• H04B7/0695

  using beam selection · CPC title