EP1797649A1 - Dispositif et procede de reglage de densites spectrales de puissance de plusieurs lignes de telecommunication - Google Patents
Dispositif et procede de reglage de densites spectrales de puissance de plusieurs lignes de telecommunicationInfo
- Publication number
- EP1797649A1 EP1797649A1 EP05809490A EP05809490A EP1797649A1 EP 1797649 A1 EP1797649 A1 EP 1797649A1 EP 05809490 A EP05809490 A EP 05809490A EP 05809490 A EP05809490 A EP 05809490A EP 1797649 A1 EP1797649 A1 EP 1797649A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- line
- sub
- power spectral
- band
- donor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/02—Channels characterised by the type of signal
- H04L5/023—Multiplexing of multicarrier modulation signals
Definitions
- the present invention relates to a method for controlling power spectral densities of a plurality of data transmitting telecommunication lines in a plurality of frequency sub-bands, wherein a power spectral density is assigned to each sub-band of each data transmitting line.
- the invention also relates to a device implementing this method.
- a device for adjusting power spectral densities of data-transmitting telecommunication lines, particularly for the management of xDSL-type lines.
- a single adjustment device connected to the transmission modem of each line makes it possible to adjust certain parameters of each of the lines independently. For example, it is possible to set a desired rate, a desired minimum noise margin, the power spectral density or parameters relating to error correction techniques.
- Lines can subscribe to heterogeneous services that do not all require the same bit rates.
- the adjustment device makes it possible to adjust them to provide this service within the limit of the overall capacity of all the lines.
- the setting of the parameters of a line occurs during the initialization of a service on this line.
- the object of the invention is to overcome this drawback by providing a method of setting up a plurality of data transmitting telecommunication lines allowing improved management of all the lines to which the setting device is connected.
- the subject of the invention is therefore a method for adjusting power spectral densities of a plurality of data transmission telecommunication lines in a plurality of frequency sub-bands, a power spectral density being assigned to each sub-band of each data transmission line, characterized in that selecting at least one line, called “donor line", whose capacity to transmit data is greater than a predetermined reference capacity; at least one sub-band of this donor line is selected; and - the power spectral density assigned to the selected subband is reduced to a predefined minimum power level in that subband.
- the invention takes advantage of the property that by reducing the power spectral density assigned to a sub-band of a line, a stationary noise of crosstalk induced by this sub-band is reduced on the other lines of the set.
- This noise reduction has the effect of automatically increasing the capacity of these other lines to transmit data.
- the capacities of the other lines of the set are increased without increasing the density spectral total power allocated on all lines.
- At least one sub-band of this doneder line is selected according to a predetermined criterion
- the selection of the sub-band of the recipient line determines the selection of the sub-band of the donor line.
- the predetermined criterion for selecting a sub-band of the recipient line is a crosstalk coupling level criterion between the lines in each sub-band of the selected recipient line.
- This criterion is particularly interesting since it makes it possible to select the frequency sub-bands whose extinction has the greatest effect on the other lines in terms of stationary noise reduction.
- the predetermined criterion may be a standard signal-to-noise ratio criterion in each selected subband of the selected recipient line.
- the donee capacity is a minimum throughput required to perform at least one service to which the recipient line subscribes, and / or the donor capacity is equal to the maximum of the sum of a minimum throughput required to achieve the service. less a service to which the donor line subscribes with a predetermined flow margin, and a minimum rate guaranteed by the operator.
- the ability to transmit data is a maximum data rate that a line can transmit with the power spectral density assigned to it, and the donor capacity is a predetermined reference rate.
- This embodiment is particularly advantageous in the case of data transmission by the lines whose method of binary allocation is of RA type, according to the English terminology "Rate Adaptive". In this type of transmission, at each instant, the bit rate transmitted by a line is equal to the maximum data rate that the line can transmit. Thus, in this case, it is easy to measure the maximum data rate that the line can transmit since it is the actually transmitted bit rate.
- an adjustment method may comprise the following steps: a first group of donated lines is selected; - the donor lines of the first selected group are classified; and for at least part of the donor lines of the selected group, processed in the ranking order: o selecting a lot of at least one sub-band of the recipient line according to a predetermined criterion; o selecting a batch of at least one sub-band, said "batch to be extinguished", of at least one donor line, the selection of the lot of the recipient line determining the selection of the batch to be extinguished; for the selected batch of the recipient line, at least one donor line is selected whose power spectral density assigned to the sub-band of the batch to be extinguished is greater than the predetermined level; and o for each selected donor line, the power spectral density of the sub-band of the batch to be switched off is reduced to the predefined minimum power level in this sub-band.
- a maximum of a predetermined number of donor lines is selected for the selected batch of the recipient line. Indeed, selecting too many donor lines for the selected lot of the recipient line may be unnecessary.
- the selection of donor lines Beyond the predetermined number does not necessarily significantly increase the capacity to transmit data from the recipient line because according to certain standards, it can not exceed a maximum number of bits per subband.
- a method according to the invention may further comprise one or more of the following features:
- the two following conditions are verified: o if the donee line was a donor line during a previous execution of the adjustment process; and o if it is the case, if the power spectral density assigned to at least one sub-band has been reduced to the predefined minimum power level in this sub-band during this previous execution of the tuning method; if these two conditions are verified, the spectral power density in this subband is restored to the initial power level before reduction;
- an activation message is transmitted from the transmitting terminal to the receiving terminal;
- the reception of this activation message by the receiving terminal causes the transmission of a request message for modification of the power spectral density transmitted in the sub-band, from the receiving terminal to the transmitting terminal;
- the transmitting terminal restores the power spectral density in the sub-band, in accordance with the instructions contained in the message sent by the receiving terminal; -
- the subject of the invention is also a device for adjusting the power spectral densities of several telecommunication lines transmitting data in several frequency sub-bands, a power spectral density being assigned to each sub-band of each data transmission line, characterized in that it comprises:
- Donor line means for selecting at least one line, called "donor line", whose capacity to transmit data is greater than a predetermined reference capacity
- FIG. 1 shows schematically the general structure of an embodiment of the adjustment device according to the invention
- FIG. 2 represents the successive steps of a power spectral density adjustment method implemented by the device of FIG. 1, according to a possible embodiment of the invention
- FIG. 3 represents the successive steps of a power spectral density modification method that can be combined with a power spectral density adjustment method according to the invention.
- the adjustment device 10 shown in FIG. 1 makes it possible to adjust the power spectral densities of several telecommunication lines 12a, 12b, ...,
- Each line 12a, 12b, ..., 12c is associated with a transmission modem 16a, 16b,
- the transmission modems 16a, 16b 16c are hosted by the same central office 14 and are all connected to the adjustment device 10.
- Each line 12a, 12b, ..., 12c is further connected to a receiving terminal 18a, 18b, ..., 18c.
- the adjustment device 10 comprises means 20a, 20b, ..., 20c of connection to the lines 12a, 12b, ..., 12c. These connection means 20a, 20b, ..., 20c are themselves connected to a data transmission bus 22 of the adjustment device 10.
- the adjustment device 10 further comprises means 24 for extracting parameters specific to the lines 12a, 12b, ..., 12c to which it is connected. These parameters specific to lines 12a, 12b,..., 12c are, for example, the desired flow rate, the the minimum noise margin required, the actual transmitted rate, power spectral density, or parameters related to error correction techniques.
- These means 24 for extracting parameters are connected to the transmission bus 22. They can be activated at any time, even during communication on one or more lines 12a, 12b, ..., 12c.
- the adjustment device 10 also comprises means 26 for selecting at least one line, called "donor line” whose ability to transmit data is greater than a predetermined reference capacity. These selection means 26 are also suitable for selecting at least one sub-band of this donor line.
- the capacity to transmit data is a maximum data rate that a line 12a, 12b, ..., 12c can transmit with the power spectral density assigned to it, and the predetermined reference capacity. is a rate equal to the maximum of the sum of a minimum throughput required to perform at least one service to which a line 12a, 12b, ..., 12c is subscribed with a predetermined throughput margin, and a minimum throughput guaranteed by the operator
- the adjustment device 10 finally comprises means 28 for reducing the power spectral density assigned to the selected sub-band of the selected donor line to a predefined minimum power spectral density level in this sub-band. This reduction is called "subband extinction”.
- the number of selected subbands of the donor line, intended to be extinguished, must be such that the actual rate in this line remains higher than the minimum required rate, even after reduction of the power spectral density by the device. adjustment 10.
- the addition of the predetermined flow margin to the minimum required flow rate guarantees this requirement.
- the function of the adjustment device 10 is in particular to optimize the power spectral densities allocated to each of the lines 12a, 12b,..., 12c as a function of the services to which each of these lines subscribes and of the resources available for the set. lines.
- the adjusting device 10 operates according to a method which will now be described with reference to FIG. 2.
- a minimum bit rate required to carry out the service or services at which this line 12a, 12b,... 12c is subscribed is subscribed. and that a customer wants to get.
- two reference capacitors called “donor capacity” are also determined.
- Donee Capacity means the Donee Capacity being equal to the Required Minimum Throughput, and the Donor Capacity being equal to the maximum of the sum of the Minimum Flow Required with the predetermined Debit Margin, and a Minimum Rate Guaranteed by the Operator.
- each line 12a, 12b, ..., 12c is accessed at a maximum data rate it can transmit with the power spectral density assigned to it.
- This maximum rate constitutes an ability to transmit data from line 12a, 12b, ..., 12c.
- donor lines a first group of lines, called “donor lines”, whose capacity to transmit data is smaller than the recipient capacity, is selected.
- a second group of lines is also selected, called “donor lines”, whose capacity to transmit data is greater than the donor capacity.
- the donor lines of the first group are classified according to two criteria, the first of which has priority over the second:
- the donor lines of the first group are first ranked in descending order of their level of privilege. Then, when several lines have the same privilege level, they are ranked in increasing order of their ⁇ value. These lines are ordered in the first group.
- a step 35 the first recipient line of the first group is selected.
- step 36 it is verified that the second group of lines, called “donor lines", is not empty. If it is empty, return to the selection step 32 previously described.
- step 37 there is a step 37 of selecting at least one sub-band of the recipient line previously selected.
- the sub-band is selected according to a crosstalk coupling level criterion between the lines, in each sub-band of the selected recipient line.
- the sub-bands of the recipient line that have a high level of coupling with the other lines are favored.
- several sub-bands are selected, for example the twenty-five sub-bands of the selected recipient line whose coupling level is the highest or their normalized signal-to-noise ratio.
- the selected sub-bands can themselves be classified.
- this batch assignment of sub-bands is carried out by batch of sub-bands and in several iterations during each of which one can not assign the same donor line to a single batch;
- the assignment of the donor lines to each batch of selected sub-bands of the recipient line can be repeated a maximum number N times.
- Nsb is four
- the twenty-five subbands are grouped into six batches containing four sub-bands each and one batch containing a sub-band.
- a first assignment cycle of the donor lines is then started for each batch of sub-bands. For this purpose, a first iteration is started during which each donor line is assigned to a batch of sub-bands, proceeding batch by batch. During an iteration, the maximum number of donor lines can be assigned to the same lot and the same donor line can not be assigned to more than one lot.
- a batch is selected, to which the following steps 40 and 42 are applied.
- step 40 it is first checked whether the selected batch is saturated, i.e. if a maximum number of bits per subband of the batch is reached. If this is the case, no donor line is assigned to this lot and another batch of the recipient line is selected for which step 40 is taken at its beginning. Otherwise, we keep this selected batch. Then, the donor lines are scanned to determine at most one of the donor lines that can be assigned to the selected lot. A donor line is assigned to this batch of subbands if the corresponding subbands in the donor line are not already all extinguished and if this donor line has not already been assigned to another batch in the current iteration . Then all the corresponding sub-bands of the donor line are turned off.
- step 42 we measure the new capacity to transmit data from the selected recipient line. If this capacity is greater than the recipient capacity, it is considered that the donee line is processed, it is removed from the first group of lines donee and we go to a test stage. During this step 43, it is checked whether there is at least one recipient line in the first group. If this is the case, selecting a new recipient line and returning to step 36. Otherwise, proceeding to a step 44 of end of the process.
- step 42 If in step 42 the measured capacity to transmit data is less than the recipient capacity, another batch of the recipient line is selected and step 40 is returned.
- Steps 40 and 42 are repeated until no more donor lines can be assigned, for example because they have all been affected, or until there are no more lots to select. If we can no longer assign donor lines, for example because they have all already been assigned once in the current iteration, we return to step 39 to perform a new iteration of assigning donor lines, to complete the assignments of previous iterations.
- step 45 we verify that at least one donor line has been assigned to a batch of sub-bands of the donor line selected during the last iteration.
- the number NId has been reached for all the batches of sub-bands, it is possible to return to the step 39, to carry out a new cycle of assignment of the donor lines to each batch of selected sub-bands of the line donee.
- N assignment cycles are carried out, N being a predetermined number beyond which it is judged that new assignments of donor lines will not significantly increase the capacity of the recipient line.
- the donee line is extracted from the first group of the donee lines and integrated into a group line of donee lines can not be satisfied, then the process is resumed at step 43.
- the adjustment method described above is interrupted as soon as a new line becomes a donor.
- this new line is integrated in the second group of donor lines, the lines of the subsidiary group are reintegrated into the first group of the lines of the donees and the process resumes at the step 34 of classification of the lines of the donees.
- FIG. 3 shows a power spectral density modification method that can be used to perform the power spectral density level recovery in sub-bands provided in step 33 or the extinction of sub-bands. provided in step 40 of the method of FIG.
- a power spectral density modification method is already known, in which the data receiver terminal itself initiates changes in the assigned power spectral density, automatically according to the received power and / or the estimated noise on the receiver. the line by the receiving terminal.
- the receiving terminal transmits, to the transmitting terminal, a request message for modification of the power spectral density assigned to at least one selected subband. Since the receiving terminal initiates the modification, it can at any time decode the data transmitted in each frequency subband. Thus, the change in spectral density does not generate a transmission error.
- the power spectral density reduction method shown in FIG. 3 comprises the following steps:
- an activation message is transmitted from the transmitting terminal (ie the sending modem) to the receiving terminal; and - the reception of this activation message by the receiving terminal causes the transmission of a power spectral density reduction request message transmitted in the selected sub-band, from the receiving terminal to the transmitting terminal.
- This reduction method assumes that, if one wants to change the transmit power spectral density without generating a transmission error, it is preferable that this change be initiated by the receiving terminal. More specifically, during a first step 50, one of the lines 12a, 12b, ..., 12c is selected which it is desired to extinguish at least one sub-band.
- a step 52 for transmitting an activation message is carried out, so that the receiver terminal associated with this line returns a transmission power spectral density reduction request message allocated to the subbands to be switched off.
- the activation message is sent from the transmission modem 16a, 16b 16c associated with the selected line 12a, 12b,..., 12c towards the receiving terminal 18a, 18b, ..., 18c of this line 12a, 12b , ..., 12c.
- the xDSL standards define an overhead control channel, through which messages can flow between the transmitting modem 16a, 16b, ..., 16c and the receiving terminal 18a, 18b, ..., 18c. These standards also define the structure of these messages, including the structure of a "vendor-specific" message, the size and content of which can be chosen freely. Thus, preferably, the activation message is a "vendor-specific" message flowing through the overhead control channel from the transmitting modem 16a, 16b, ..., 16c to the receiving terminal 18a, 18b. , ..., 18c.
- a step 54 for transmitting the request message for reducing the transmission power spectral density assigned to the subbands to be turned off is carried out.
- This reduction request message is sent from the receiving terminal 18a, 18b, ..., 18c to the transmission modem 16a, 16b, ..., 16c.
- the xDSL standards define several types of messages intended to flow over the overhead control channel and may contain instructions for setting the transmission modem 16a, 16b, ..., 16c.
- One of these messages called "fast swap request", makes it possible to adjust the power spectral densities allocated to each sub-band by the transmission modem 16a, 16b, ..., 16c and is transmitted by the terminal receiver 18a, 18b, ..., 18c.
- the transmit power spectral density reduction request message consists of a fast swap request.
- the method described above can be used to restore the initial level of subband power spectral density, for example for the recovery planned in step 33 of the method of FIG. 2. to use a new data field in the fast swap request, this field containing in this case an indicator of the initial level.
- a method according to the invention can be executed at any time, including during the use of lines 12a, 12b, ..., 12c to perform services to which they are subscribed, since the measurements on which the settings are based can be carried out at any time. It allows to adjust the capabilities of lines in real time.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0410599A FR2876518A1 (fr) | 2004-10-07 | 2004-10-07 | Dispositif et procede de reglage de densites spectrales de puissance de plusieurs lignes de telecommunication |
PCT/FR2005/002436 WO2006040435A1 (fr) | 2004-10-07 | 2005-10-04 | Dispositif et procede de reglage de densites spectrales de puissance de plusieurs lignes de telecommunication |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1797649A1 true EP1797649A1 (fr) | 2007-06-20 |
Family
ID=34950725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05809490A Withdrawn EP1797649A1 (fr) | 2004-10-07 | 2005-10-04 | Dispositif et procede de reglage de densites spectrales de puissance de plusieurs lignes de telecommunication |
Country Status (4)
Country | Link |
---|---|
US (1) | US8406317B2 (fr) |
EP (1) | EP1797649A1 (fr) |
FR (1) | FR2876518A1 (fr) |
WO (1) | WO2006040435A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010022174A1 (fr) * | 2008-08-19 | 2010-02-25 | Actelis Networks Ltd. | Procédé et système pour une communication de ligne d'abonné numérique robuste |
WO2011082145A2 (fr) * | 2010-01-04 | 2011-07-07 | Atheros Communications, Inc. | Réglage de la puissance à l'émission |
US9295010B2 (en) | 2013-10-11 | 2016-03-22 | Qualcomm Incorporated | Dynamic transmit power and signal shaping |
US9608696B2 (en) | 2013-10-11 | 2017-03-28 | Qualcomm Incorporated | Dynamic transmit power and signal shaping |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6647058B1 (en) * | 1997-06-23 | 2003-11-11 | Paradyne Corporation | Performance customization system and process for optimizing XDSL performance |
KR100228493B1 (ko) * | 1997-08-30 | 1999-11-01 | 윤종용 | 비대칭 디지털 가입자 라인 시스템에서 송출 전력제어방법 |
US6084906A (en) * | 1997-12-17 | 2000-07-04 | Integrated Telecom Express | ADSL transceiver implemented with associated bit and energy loading integrated circuit |
US6636603B1 (en) * | 1999-07-30 | 2003-10-21 | Cisco Technology, Inc. | System and method for determining the transmit power of a communication device operating on digital subscriber lines |
CA2399265C (fr) * | 2001-08-29 | 2007-02-06 | At&T Corp. | Attribution de puissance de transmission de canal de donnees multifrequence |
US7356049B1 (en) * | 2001-12-28 | 2008-04-08 | Ikanos Communication, Inc. | Method and apparatus for optimization of channel capacity in multi-line communication systems using spectrum management techniques |
US7236451B2 (en) * | 2002-03-01 | 2007-06-26 | Telepulse Technologies Corporation | Dynamic time metered delivery |
US7127255B2 (en) * | 2002-10-01 | 2006-10-24 | Trango Systems, Inc. | Wireless point to multipoint system |
US8218609B2 (en) * | 2002-10-25 | 2012-07-10 | Qualcomm Incorporated | Closed-loop rate control for a multi-channel communication system |
US7161916B2 (en) * | 2003-08-20 | 2007-01-09 | Qualcomm Incorporated | Method and apparatus for uplink rate selection in the presence of multiple transport channels in a wireless communication system |
US7302379B2 (en) * | 2003-12-07 | 2007-11-27 | Adaptive Spectrum And Signal Alignment, Inc. | DSL system estimation and parameter recommendation |
-
2004
- 2004-10-07 FR FR0410599A patent/FR2876518A1/fr active Pending
-
2005
- 2005-10-04 WO PCT/FR2005/002436 patent/WO2006040435A1/fr active Application Filing
- 2005-10-04 EP EP05809490A patent/EP1797649A1/fr not_active Withdrawn
- 2005-10-04 US US11/664,940 patent/US8406317B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2006040435A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20090010421A1 (en) | 2009-01-08 |
US8406317B2 (en) | 2013-03-26 |
FR2876518A1 (fr) | 2006-04-14 |
WO2006040435A1 (fr) | 2006-04-20 |
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