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1. WO2002023743 - METHODS AND APPARATUS FOR TRANSMITTING INFORMATION BETWEEN A BASESTATION AND MULTIPLE MOBILE STATIONS

Publication Number WO/2002/023743
Publication Date 21.03.2002
International Application No. PCT/US2001/028322
International Filing Date 12.09.2001
Chapter 2 Demand Filed 06.03.2002
IPC
H04W 28/22 2009.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
28Network traffic or resource management
16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS
18Negotiating wireless communication parameters
22Negotiating communication rate
H04W 72/12 2009.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
72Local resource management, e.g. selection or allocation of wireless resources or wireless traffic scheduling
12Wireless traffic scheduling
CPC
H04B 17/24
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
17Monitoring; Testing
20of receivers
24with feedback of measurements to the transmitter
H04B 7/0671
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
04using two or more spaced independent antennas
06at the transmitting station
0613using simultaneous transmission
0667of delayed versions of same signal
0671using different delays between antennas
H04B 7/0682
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
04using two or more spaced independent antennas
06at the transmitting station
0613using simultaneous transmission
0682using phase diversity (e.g. phase sweeping)
H04L 1/0026
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
0023characterised by the signalling
0026Transmission of channel quality indication
H04W 28/22
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
28Network traffic or resource management
16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
18Negotiating wireless communication parameters
22Negotiating communication rate
H04W 52/267
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
52Power management, e.g. TPC [Transmission Power Control], power saving or power classes
04TPC
18TPC being performed according to specific parameters
26using transmission rate or quality of service QoS [Quality of Service]
267taking into account the information rate
Applicants
  • FLARION TECHNOLOGIES, INC. [US]/[US] (AllExceptUS)
  • VISWANATH, Pramod [IN]/[US] (UsOnly)
  • LAROIA, Rajiv [IN]/[US] (UsOnly)
  • TSE, David, N., C. [CA]/[US] (UsOnly)
Inventors
  • VISWANATH, Pramod
  • LAROIA, Rajiv
  • TSE, David, N., C.
Agents
  • STRAUB, Michael, P.
Priority Data
09/691,76618.10.2000US
60/232,92815.09.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHODS AND APPARATUS FOR TRANSMITTING INFORMATION BETWEEN A BASESTATION AND MULTIPLE MOBILE STATIONS
(FR) PROCEDES ET APPAREIL PERMETTANT DE TRANSMETTRE DES INFORMATIONS ENTRE UNE STATION DE BASE ET DES STATIONS MOBILES MULTIPLES
Abstract
(EN)
Methods and apparatus for scheduling mobile stations (MSs) to download data and/or to control the rate of downloading to an MS from a base station (BS) as a function of downlink channel condition information are described. Artificial channel variations, which can be measured at the MS, and feedback to a BS for scheduling purposes, are introduced through the use of two or more transmitter antennas at a BS. Each of the antennas transmits a signal at the same frequency having the same information content, e.g., modulated data. However the signals are mode to differ with time in their phase and/or amplitude. Multiple signals having the same transmission frequency and information content are received and interpreted as a single composite signal by a receiving MS. The interaction of the received signals and the intentional variations introduced into the signals result an MS detecting different signal amplitudes and/or phases over time even when the total amount of power used to transmit the combination of the signals having the same information content remains constant with time. Data transmission rates are controlled in some embodiments as a function of channel conditions, e.g., the better the channel conditions the faster the transmission data rate used. By varying the data rate as a function of channel conditions and by preferring MSs with good channel conditions to those with bad channel conditions, improved overall throughput can be achieved by a BS with regard to downlinks as compared to known systems.
(FR)
La présente invention concerne des procédés et un appareil permettant de programmer des stations mobiles (MS) pour télécharger des données et/ou pour commander le débit de téléchargement d'une MS à une station de base (BS) en fonction des informations des conditions du canal de liaison descendante. Des modifications de canal artificielles, qui peuvent être mesurées à la MS, et une information de retour à la BS pour des raisons de programmation, sont introduites via au moins deux antennes d'émetteur à la BS. Chacune de ces antennes émet un signal de même contenu (par exemple des données modulées),à la même fréquence. Cependant ces signaux sont conçus pour différer dans le temps dans leur phase et/ou amplitude. De multiples signaux possédant la même fréquence d'émission et le même contenu sont reçus et interprétés comme un signal composite unique par une MS de réception. L'interaction des signaux reçus et les modifications intentionnelles introduites dans ces signaux font qu'une MS détecte des amplitudes et/ou des phases de signal différentes dans le temps même quand la quantité d'énergie totale utilisée pour émettre la combinaison des signaux de même contenu reste constante dans le temps. Dans certains modes de réalisation de l'invention, les débits de transmission de données sont commandés en fonction des conditions de canal, par exemple meilleures sont les conditions de canal, plus rapide est le débit de transmission de donnée utilisé. En variant le débit des données en fonction des conditions de canal et en préférant les MS avec de bonnes conditions de canal par rapport à celles qui en ont de mauvaises, une BS améliore les rendements pour ce qui concerne ses liaisons descendantes si on compare ces rendements à ceux des systèmes connus.
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