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1. WO2000044114 - DETECTING AND MINIMIZING THE EFFECTS OF TRANSMITTER NOISE ON SIGNAL STRENGTH MEASUREMENT IN A WIRELESS COMMUNICATION SYSTEM

Publication Number WO/2000/044114
Publication Date 27.07.2000
International Application No. PCT/US2000/001187
International Filing Date 18.01.2000
Chapter 2 Demand Filed 18.07.2000
IPC
H04B 17/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
17Monitoring; Testing
H04B 7/26 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
24for communication between two or more posts
26at least one of which is mobile
H04W 36/30 2009.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
36Handoff or reselecting arrangements
24Reselection being triggered by specific parameters
30by measured or perceived connection quality data
H04W 72/08 2009.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
72Local resource management, e.g. selection or allocation of wireless resources or wireless traffic scheduling
04Wireless resource allocation
08based on quality criteria
CPC
H04B 17/21
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
17Monitoring; Testing
20of receivers
21for calibration; for correcting measurements
H04B 17/318
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
17Monitoring; Testing
30of propagation channels
309Measuring or estimating channel quality parameters
318Received signal strength
H04W 36/30
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
36Hand-off or reselection arrangements
24Reselection being triggered by specific parameters ; used to improve the performance of a single terminal
30by measured or perceived connection quality data
H04W 72/08
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
72Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
04Wireless resource allocation
08where an allocation plan is defined; based on quality criteria
Applicants
  • ERICSSON INC. [US/US]; 7001 Development Drive Research Tiangle Park, NC 27709, US
Inventors
  • WALLSTEDT, Kenneth; US
  • WARD, Torbjorn; US
Agents
  • MONCO, Dean, A.; Wood, Phillips, VanSanten, Clark & Mortimer Suite 3800 500 West Madison Street Chicago, IL 60661-2511, US
Priority Data
09/236,24925.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DETECTING AND MINIMIZING THE EFFECTS OF TRANSMITTER NOISE ON SIGNAL STRENGTH MEASUREMENT IN A WIRELESS COMMUNICATION SYSTEM
(FR) DETECTION ET REDUCTION DES EFFETS CAUSES PAR LE BRUIT D'UN EMETTEUR SUR LA MESURE D'INTENSITE DU SIGNAL DANS UN SYSTEME DE COMMUNICATION SANS FIL
Abstract
(EN)
A system and method for minimizing effects of both internal and external transmitter noise in order to improve control decisions that are based on signal strength measurements. A wireless network includes an internal transmitter transmitting a first signal at a first frequency and noise at other frequencies in a known pattern. The signal strength of the first signal is measured by the receiver at the first frequency. The noise of the transmitter of the first signal is calculated on other frequencies, using the first transmitter's known noise pattern. A determination is then made whether the noise of the first signal is above a threshold on one or more of the other frequencies used by the wireless communication system. If the noise is above the threshold, corrective action is taken. The wireless network further includes one or more receivers that measure signal strengths on the range of frequencies used by the system. A correlation is made between the known spectral pattern of transmitters external to the system and the signal strength measurements. If the correlation is above a threshold, then external noise is present and corrective action is taken.
(FR)
L'invention concerne un système et un procédé de réduction des effets causés par le bruit externe et interne d'un émetteur de manière à améliorer les décisions de commande fondées sur les mesures de l'intensité des signaux. Un réseau sans fil comprend un émetteur interne émettant un premier signal à une première fréquence et un bruit à d'autres fréquences dans un modèle connu. Le récepteur mesure l'intensité du signal du premier signal sur une première fréquence. Le modèle de bruit connu du premier récepteur sert, quant à lui, à calculer le bruit de l'émetteur du premier signal sur d'autres fréquences. Cette invention permet ensuite de déterminer si le bruit du premier signal dépasse le seuil sur une ou plusieurs des fréquences utilisées par le système de communication sans fil. Le cas échéant, les corrections nécessaires sont amorcées. Le réseau sans fil comprend en outre un ou plusieurs récepteurs mesurant les intensités des signaux sur la plage de fréquences utilisées par le système. Une corrélation s'effectue entre le modèle spectral connu d'émetteurs externes au système et les mesures de l'intensité des signaux. Si la corrélation est supérieure à un seuil donné, cela signifie qu'il y a bruit externe et les corrections sont entreprises.
Also published as
ININ/PCT/2001/00798/MUM
ZA200105519
Latest bibliographic data on file with the International Bureau