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1. WO2002025856 - DYNAMIC WIRELESS LINK ADAPTATION

Publication Number WO/2002/025856
Publication Date 28.03.2002
International Application No. PCT/US2001/029395
International Filing Date 20.09.2001
Chapter 2 Demand Filed 19.04.2002
IPC
H04L 1/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
H04L 1/16 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
1Arrangements for detecting or preventing errors in the information received
12by using return channel
16in which the return channel carries supervisory signals, e.g. repetition request signals
CPC
H04B 17/309
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
17Monitoring; Testing
30of propagation channels
309Measuring or estimating channel quality parameters
H04B 17/336
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
17Monitoring; Testing
30of propagation channels
309Measuring or estimating channel quality parameters
336Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
H04L 1/0002
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
0002by adapting the transmission rate
H04L 1/0003
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
0002by adapting the transmission rate
0003by switching between different modulation schemes
H04L 1/0009
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
0009by adapting the channel coding
H04L 1/002
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
0015characterised by the adaptation strategy
0019in which mode-switching is based on a statistical approach
002Algorithms with memory of the previous states, e.g. Markovian models
Applicants
  • APERTO NETWORKS, INC. [US]/[US]
Inventors
  • VARMA, Subir
  • MAJIDI-AHY, Reza
  • HAKIM, Joseph
  • WONG, Wendy, Chiu, Fai
Agents
  • SWERNOFSKY, Steven, A.
Priority Data
09/665,39420.09.2000US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DYNAMIC WIRELESS LINK ADAPTATION
(FR) ADAPTATION DYNAMIQUE DE LIAISON SANS FIL
Abstract
(EN)
A system that adapts wireless link parameters for a wireless communication link. A measure is determined of errors occuring in communication over a wireless link. In a case that the measure of errors corresponds to more errors than a first predetermined threshold, communication changes from a first set of wireless link parameters to a second set of wireless link parameters. The second set of wireless link parameters corresponds to higher error tolerance than the first set of wireless link parameters. In a case that the measure of errors corresponds to fewer errors than a second predetermined threshold, communication changes from the first set of wireless link parameters to a third set of wireless link parameters. The third set of wireless link parameters corresponds to lower error tolerance than the first set of wireless link parameters. Preferably, the measure of errors is determined by monitoring a number of NACK messages and a number of ACK messages that occur. It is determined that the measure of errors corresponds to more errors than the first predetermined threshold when more than a predetermined number of NACK messages occur in succession. It is determined that the measure of errors corresponds to fewer errors than the second predetermined threshold when more than a predetermined number of ACK messages occur in succession.
(FR)
L'invention concerne un système qui adapte des paramètres de liaison sans fil en vue d'une liaison de communication sans fil. Une mesure d'erreurs survenant dans la communication sur une liaison sans fil est déterminée. Dans une situation où la mesure d'erreurs correspond à un nombre d'erreurs plus important qu'un premier seuil prédéterminé, la communication passe d'un premier ensemble de paramètres de liaison sans fil à un second. Ce second ensemble de paramètres de liaison sans fil correspond à une tolérance d'erreurs plus importante que le premier ensemble. Dans une situation où la mesure d'erreurs correspond à un nombre d'erreurs moins important qu'un second seuil prédéterminé, la communication passe du premier ensemble de paramètres de liaison sans fil à un troisième ensemble de paramètres. Ce dernier ensemble correspond à une tolérance d'erreurs moins importante que le premier ensemble de paramètres. La mesure d'erreurs est, de préférence, déterminée par une surveillance d'un nombre de messages NACK et d'un nombre de messages ACK qui apparaissent. Il est établi que la mesure d'erreurs correspond à un nombre d'erreurs plus important que le premier seuil prédéterminé lorsque le nombre de messages NACK apparaissant successivement dépasse un nombre prédéterminé. Il est établi que la mesure d'erreurs correspond à un nombre d'erreurs moins important que le second seuil prédéterminé lorsque le nombre de messages ACK apparaissant successivement dépasse un nombre prédéterminé
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