EP2055044A1 - Dispositif d'adaptation de schéma(s) de modulation et d'encodage de données destinées à être diffusées vers des terminaux de communication radio - Google Patents
Dispositif d'adaptation de schéma(s) de modulation et d'encodage de données destinées à être diffusées vers des terminaux de communication radioInfo
- Publication number
- EP2055044A1 EP2055044A1 EP07787790A EP07787790A EP2055044A1 EP 2055044 A1 EP2055044 A1 EP 2055044A1 EP 07787790 A EP07787790 A EP 07787790A EP 07787790 A EP07787790 A EP 07787790A EP 2055044 A1 EP2055044 A1 EP 2055044A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radio
- broadcast
- data
- network
- terminals
- 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- Withdrawn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
- 238000004891 communication Methods 0.000 title claims abstract description 35
- 230000006978 adaptation Effects 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 48
- 230000009897 systematic effect Effects 0.000 claims description 7
- 239000000969 carrier Substances 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 16
- 230000001413 cellular effect Effects 0.000 description 8
- 230000007774 longterm Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229920001690 polydopamine Polymers 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
Definitions
- the invention relates to radio communication networks having a first frequency band or first time slots for broadcasting by waves, by means of a carrier dedicated to a broadcasting service, data on a so-called one-way channel. to radio communication terminals.
- radio communication network is meant here any type of network having a radio access network capable of broadcasting data. It may in particular be a satellite network, such as for example a network SDMB (for "Satellite Digital Multimedia Broadcast”), or a terrestrial radio network, such as a UMTS network suitable for broadcasting (for example type MBMS (for "Multimedia Broadcast / Multicast Services”), or its evolution called LTE ("Long Term Evolution"), or GPRS, or DVB-H (for "Digital Video Broadcasting - Handhelds" - mobile TV)), or a hybrid network (satellite and terrestrial).
- SDMB for "Satellite Digital Multimedia Broadcast”
- a terrestrial radio network such as a UMTS network suitable for broadcasting (for example type MBMS (for "Multimedia Broadcast / Multicast Services”), or its evolution called LTE ("Long Term Evolution"), or GPRS, or DVB-H (for "Digital Video Broadcasting - Handhelds” - mobile TV)
- the term "one-way” is understood here to mean the channel for broadcasting data from the network to the radio (communication) terminals (it is also called a downlink) in the case of a terrestrial network.
- the channel for broadcasting data from the network to the radio (communication) terminals (it is also called a downlink) in the case of a terrestrial network.
- return channel the channel allowing radio terminals to transmit data to the network (it is also called uplink (or “uplink”) in the case of a terrestrial network).
- radio communication terminal is intended here to mean any fixed or mobile (or portable or cellular) communication equipment capable of exchanging data over the airwaves with other equipment, via a radio access network. . Therefore, it may for example be a fixed or mobile phone (or cellular), a computer or laptop, or a personal digital assistant (or PDA), as soon as it is equipped with means radio communication, possibly satellite, capable of receiving broadcast data.
- PDA personal digital assistant
- broadcast service here refers to any one-way point-to-multipoint broadcast service of multimedia content (s), and in particular the MBMS broadcast service, the SDMB broadcast service, the broadcast service, and the broadcast service.
- a DVB-H broadcast service including its satellite network variant, and the broadcast services proposed in the UMTS revolution called LTE (Long Term Evolution) and GSM / GPRS networks (MBMS / GPRS) ) or WBCDMA.
- the MBMS broadcast service is defined in the sixth version of 3GPP specifications (3rd Generation Partnership Project), which governs the transmission of multimedia data in mobile (or cellular) networks, such as UMTS or EDGE networks, and in particular in the technical specifications 3GPP TS 25.346 and 23.246 (notably accessible on the 3GPP website at "ftp.3gpp.org").
- 3GPP specifications 3rd Generation Partnership Project
- multimedia content here means data files (or “data” in English), voice, audio files, or videos, in particular.
- the radio access network or RAN
- the modulation and encoding scheme (s) for the data to be broadcast to certain radio terminals on the forward channel, by means of a dedicated carrier (for example the MBMS carrier).
- This adaptation can for example be made from measurement reports transmitted by the radio terminals on the forward path.
- the radio terminals are arranged to transmit the Block Error Rate (BLER) measurement which represents the percentage of the lost (ie not received) data blocks by relative to the data blocks transmitted by the network on the forward channel.
- BLER Block Error Rate
- the MBMS cells offer neither downlink transport channels type PCH ("Paging CHannel") for the transmission of "paging" indicators relating to idle conditions (so-called “idle” mode), nor access channels on the uplink to request permission to transmit in a cell. Therefore, radio terminals must obtain paging information and / or perform radio measurements of radio reception conditions in other cells or frequencies other than those of MBMS or other radio access technologies. than that used by the MBMS broadcast service.
- PCH downlink transport channels type PCH
- a radio terminal when a radio terminal does not have a sufficient number of reception channels to receive parallel MBMS broadcast data and paging information or to receive MBMS broadcast data (and possibly paging information) and perform parallel radio measurements, it is forced to stall successively its reception on different carriers including the dedicated carrier (MBMS).
- MBMS dedicated carrier
- These successive settings are made in cycles that may be identical for all radio terminals attached to a given radio network or may vary from one radio terminal to another according to their respective needs and / or their identity (IMSI ) and / or their capabilities. These cycles are sometimes called "DRX cycles"("DiscontinuousReception"). Because of such cycles, whenever a mobile terminal is keyed on another carrier than the dedicated carrier (MBMS), it can not receive the broadcast data.
- a radio terminal After each setting on a carrier different from that which is dedicated to the broadcasting service, a radio terminal generates a measurement of BLER which can indicate a very large number of blocks not received. These measurements of BLER are therefore biased, and therefore not representative of the actual (ie real) radio conditions on the frequency dedicated to the MBMS. As a result, the radio access network performs a modulation scheme adaptation and data encoding from skewed measures, which is not optimal, or may be detrimental. In addition, radio terminals may be subject to other constraints than radio conditions, which are not currently taken into account. The invention therefore aims to improve the situation.
- the forward channel correspond respectively to first and second distinct frequency bands (in the case of the FDD (Frequency Division Dupleix) transmission mode) or to separate time slot assemblies (for example in the TDD (Time Division Dupleix) transmission mode which consists in using a single carrier divided into time slots allocated selectively to the forward and backward channels).
- FDD Frequency Division Dupleix
- TDD Time Division Dupleix
- This adaptation device is characterized in that it comprises processing means responsible for adapting at least one data modulation and encoding scheme (to be broadcast by means of the dedicated carrier) as a function of actual conditions of operation. radio broadcasting on links established between the radio network and radio terminals which are the recipients of the data to be broadcast.
- the device according to the invention can comprise other characteristics that can be taken separately or in combination, and in particular: in a first embodiment, the processing means can be responsible for determining the actual radio broadcast conditions from measurements that are transmitted by at least some of the radio terminals (recipients of the data to be broadcast), and which are representative of the quality of at least one radio channel of reception of these radio terminals (recipients of the data to be broadcast);
- the measurements may be reception channel quality indicators (or CQIs for Channel Quality Indicators); Its processing means may be responsible for adapting each data modulation and encoding scheme (to be broadcast by means of the dedicated carrier) according to the worst or the best reception radio channel quality indicator, or according to the average of the reception radio channel quality indicators. In the latter case, the processing means may be responsible for weighting the measurements (indicators) intervening in the average according to at least one radio parameter, such as for example the power used by a radio terminal to transmit its measurements on a channel broadcast return channel radio; in a second embodiment, the processing means may be responsible for determining the actual radio broadcast conditions from, on the one hand, block error rate (BLER) measurements transmitted by at least some of the terminals.
- BLER block error rate
- radio reactive to radio
- constraints may, for example, be representative of the cycles during which the radio terminals are constrained to stall successively their reception on different carriers including the dedicated carrier;
- the cycles concern the dedicated carrier and at least one other carrier selected for example from a carrier used for the
- Paging and a carrier used to perform measurements representative of the quality of at least one radio reception channel of a radio terminal
- constraints can be transmitted to the device by at least some of the radio terminals on the broadcast return channel, without requiring systematic acknowledgment on the forward path of broadcast.
- the term "does not require systematic acquittal” here means requiring an acquittal only and exclusively when specifically requested; at least some of the constraints may be provided to the device by the radio communication network;
- At least some of the measurements may be transmitted to the device by at least some of the radio terminals on a return channel dedicated to broadcasting and not requiring systematic acknowledgment on the forward broadcast channel;
- Such measurements can for example be contained in data messages of the type called measurement report.
- the invention also proposes a network equipment, for a radio communication network, provided with an adaptation device of the type of that presented above.
- network equipment may for example be an access gateway (or “access gateway”) for accessing a core network (or “core network”) of the radio communication network.
- the attached drawing may not only serve to complete the invention, but also contribute to its definition, if any.
- the object of the invention is to enable a radio access network of a radio communication network to adapt the data modulation and encoding scheme (s) (possibly of multimedia type) which must be broadcast to radio terminals on the forward broadcast channel, by means of a dedicated carrier, according to actual (or actual) radio propagation conditions on links established between the radio network and these radio terminals (recipients of the data to be broadcast ).
- the communication terminals are mobile phones (or cellular). But, the invention is not limited to this type of radio terminal. It concerns any fixed or mobile communication equipment (or mobile or cellular) capable of exchanging data over the air with other equipment via a radio access network. Therefore, he may also they are fixed or mobile (or cellular) telephones, fixed or portable computers, or PDAs, equipped with radio communication means, possibly satellite, capable of receiving broadcast data. Furthermore, it is considered in the following, by way of non-limiting example, that the radio communication network is a terrestrial data broadcast network, for example multimedia type.
- the network is a revolution called LTE ("Long Term Evolution") of a cellular network (or mobile) type UMTS / MBMS (Multimedia Broadcast / Multicast Services).
- LTE Long Term Evolution
- UMTS / MBMS Multimedia Broadcast / Multicast Services
- it could also be a network of the UMTS / DVB-H type, adapted in particular to the broadcasting of mobile television programs (or "mobile TV”), for example.
- the invention is not limited to terrestrial data broadcast radio networks alone. It generally concerns any type of network having a radio access network capable of broadcasting data, and in particular satellite networks, for example SDMB (for "Satellite Digital Multimedia Broadcast”) networks, or hybrid networks (satellite and terrestrial).
- satellite networks for example SDMB (for "Satellite Digital Multimedia Broadcast”) networks, or hybrid networks (satellite and terrestrial).
- an LTE broadcast network can, in a very schematic manner, but nevertheless sufficient to understand the invention, be summarized at a core network (or "Core Network" in English) CN coupled to a radio access network.
- the radio access network of an LTE network mainly comprises base stations (called Node Bs) Ni and at least one access gateway (or “access gateway”) PA connected to the base stations Ni.
- Each base station Ni is associated with at least one (logic) cell Ci covering a radio zone (or coverage area) in which mobile (or cellular) radio communication terminals UE can establish (or continue) radio links and in which base station Ni can broadcast data, for example multimedia type (such as television programs, in particular).
- each base station Ni is associated with a cell Ci. But, a base station can be associated with several cells.
- the access gateway PA is a centralized equipment which notably provides the interface between the core network CN and the base stations Ni, in particular to provide them with the data to be broadcast.
- the core network CN comprises network equipment which for some are connected in particular to the access gateway PA.
- the core network CN may be mentioned at least one node providing the connection of the core network CN to a service network (s), for example of the IP type, which materializes the services that are made available to the users of the mobile terminals UE. by the operator of the radio network, and in particular the data broadcasting services.
- Each base station Ni comprises an emission module ME and a reception module MR.
- the transmission module ME receives the data to be broadcast according to a chosen modulation and encoding scheme and integrates them into frames of data that it broadcasts, in the form of radio signals by means of a dedicated carrier, on a channel. go (or "downlink") dedicated primarily to broadcasting.
- the reception module MR is responsible for receiving the data frames transmitted by the mobile terminals UE on a return channel (or "uplink"), and to communicate them if necessary to the access gateway PA.
- the forward and backward broadcast channels correspond respectively to first and second distinct frequency bands or to distinct slices or sets of time slots (for example in the case of the TDD (Time Division Dupleix) transmission mode. )).
- the mobile terminals UE are equipped with a communication module MC able, on the one hand, to receive the data frames that are broadcast by the radio access network on the forward path and to transmit to the access network. radio data frames on the return path.
- the communication module MC is also able to obtain paging information and to perform radio measurements relating to the radio reception conditions in its home cell and / or in other neighboring cells and / or with other technologies. radio access used by the broadcasting service.
- Some mobile terminals UE which are provided with a communication module MC not having enough parallel reception channels, are arranged to wedge the reception portion of their communication module MC successively on different carriers, of which the carrier dedicated to broadcasting on the way out.
- These successive settings are made according to so-called DRX cycles ("Discontinuous Reception") which are identical or which vary from one radio terminal to another according to their respective needs and / or their capacities and / or their identity ( IMSI).
- Such a mobile terminal UE will therefore, for example, be able to receive the carrier dedicated to the broadcast on the forward channel for a first duration D1, and then receive the carrier used to transmit the paging indicators on one or more downstream channels of type PCH for a second duration D2, then make radio measurements on one or more down channels during a third duration D3 (so as to estimate the quality of this (s) down channel (s)), then again receive the carrier dedicated to the broadcast on the forward channel for a first duration D1, and so on.
- the first D1, second D2 and third D3 durations together define a DRX cycle.
- the invention proposes to implement in the radio network an adaptation device D responsible for adapting, as a function of the actual radio conditions, the modulation and encoding scheme (s) for encoding the data that must be broadcast to certain terminals.
- EU mobile in the forward path of broadcast, by means of a dedicated carrier.
- MCS Modulation and Coding Scheme
- the adaptation device D can be implemented in an access gateway PA. But, this is not an obligation. It could indeed be implanted in, or coupled to, another type of network equipment than an access gateway, belonging to the radio access network.
- the implementation in the access gateway PA is advantageous because it is in particular responsible for the centralized management of the modulation and encoding of data within the radio access network.
- the adaptation device D comprises a processing module MT which is responsible for adapting at least one data modulation and encoding scheme (to be broadcast by means of the dedicated carrier) according to actual conditions. (or real) radio propagation on links established between the radio network and mobile terminals UE (recipients of the data to be broadcast).
- a processing module MT which is responsible for adapting at least one data modulation and encoding scheme (to be broadcast by means of the dedicated carrier) according to actual conditions. (or real) radio propagation on links established between the radio network and mobile terminals UE (recipients of the data to be broadcast).
- At least two embodiments may be envisaged for the device D.
- the processing module MT determines the actual radio broadcast conditions from measurements transmitted to it by at least some of the mobile terminals UE which are the recipients of the data to be broadcast. These measurements are then representative of the quality of one or more radio reception channels of the radio terminals which are the recipients of the data to be broadcast.
- at least some of the measurements are what those skilled in the art call reception channel quality or CQI (for Channel Quality Indicator) indicators. These indicators include the signal-to-noise ratio (Ec / N 0 ), RSCP ("Received Signal Channel Power" - power received on the allocated physical channel), and RSSI (“Received Signal Strength Indicator”). the energy of the signal received over the entire band).
- the values of these CQIs are generally measured by the mobile terminals UE so that the network can adapt the reception and / or transmission portions of their communication module MC. Some of them are also useful for the radio access network to adapt its own reception and / or transmission channels.
- These measurements are transmitted to the device D by the mobile terminals EU who perform them. For this purpose, it is advantageous for them to use the return channel dedicated to broadcasting. This transmission of measurements is then preferably done without systematic acknowledgment on the forward path of broadcasting (that is to say that the device D (or the radio access network) is obliged to address an acknowledgment message when he receives them if and only if specifically requested).
- the measurements may, for example, be transmitted in specific messages or in messages of the type of those used to signal the network of events internal to the mobile terminal UE. They can also be transmitted in messages of the type of those used to transmit measurements to the network, such as measurement reports (or "MEASUREMENT REPORTS") used particularly in networks of UMTS type. Such reports are for example used to communicate position measurements, determined by an internal application of the terminal UE from location information (for example from a constellation of GPS or GALILEO satellites), or volume measurements. traffic or quality of service (QoS) determined by an internal application of the EU terminal. Furthermore, the transmission of these messages to the device D can for example be done by random access on the return channel broadcast.
- measurement reports or "MEASUREMENT REPORTS”
- Such reports are for example used to communicate position measurements, determined by an internal application of the terminal UE from location information (for example from a constellation of GPS or GALILEO satellites), or volume measurements. traffic or quality of service (QoS) determined by an internal application of the EU terminal.
- Measurements can be used in different ways. For example, the processing module MT can determine which of the measures it has the best (respectively the worst), then it adapts each scheme of modulation and data encoding according to this better (respectively of this more bad) measure.
- the processing module MT can determine the average value of the measurements of the same type at its disposal, then it adapts each data modulation and encoding scheme according to this average value.
- the processing module MT may possibly start by weighting each measurement as a function of at least one radio parameter, such as, for example, the power used by the mobile terminal UE to transmit it over a radio channel of the broadcast return channel. , before determining the average value of the weighted measures.
- the processing module MT determines the effective radio broadcast conditions from, on the one hand, block error rate (BLER) measurements that are transmitted by at least some of the mobile terminals.
- BLER block error rate
- constraints are preferably representative of the DRX cycles of the mobile terminals UE.
- constraints are for example transmitted by the mobile terminals UE which undergo them. For this purpose, it is advantageous for them to use the return channel dedicated to broadcasting. This transmission of constraints is then preferably done without systematic acknowledgment on the forward path of diffusion.
- the constraints may for example be transmitted in specific messages, or in messages of the type of those used to signal the network of events internal to the mobile terminal UE, or in messages of the type used to transmit measurements to the network, such as MEASUREMENT REPORTS.
- the transmission of these messages to the device D can for example be done by random access on the broadcast return channel. In a variant corresponding to a TDD type transmission mode, it is possible to use certain time slots reserved for the broadcast return channel to transmit the messages containing the first constraints.
- This transmission of constraints is particularly well adapted to situations in which the DRX cycles of some EU mobile terminals are not known to the network, as they vary according to the needs of these EU mobile terminals.
- the radio network for example the CN core network
- the radio network for example the CN core network
- the Block Error Rate (BLER) measurements are the ratio between the number of data blocks received by the mobile terminal UE and the number of blocks transmitted by the block. radio network) can also be sent by the mobile terminal UE in measurement reports or in dedicated messages.
- constraints and measurements may possibly be transmitted simultaneously by a mobile terminal UE within the same dedicated message or not.
- the processing module MT When the processing module MT has BLER constraints and measurements, it can, for example, make reconciliations between constraints and BLER measurements that correspond, before determining an adaptation.
- the processing module MT may correlate a (very) bad measure of BLER with a period of a DRX cycle during which a mobile terminal UE could not receive the broadcast service. In this case, the processing module MT may not take into account the received BLER measurement, or it may correct it by weighting it before using it for adaptation.
- the processing module MT uses the constraints to determine if measures are outliers, then to correct or rule out the outliers. Then, it determines the adaptation to be carried out from the remaining (possibly corrected) measurements, which are unbiased and hence henceforth representative of the actual radio conditions on the links established between the radio access network and the mobile terminals UE (recipients of the data to be disseminated).
- the processing module MT When the processing module MT has only certain constraints, such as certain DRX cycles (because they are not all available for all mobile terminals UE concerned by a broadcast), it can for example determine its adaptations in the most or least representative DRX cycle and / or DRX cycle that is associated with the highest quality of service (QoS), or the DRX cycle where an EU mobile terminal is most often out of reception.
- certain DRX cycles because they are not all available for all mobile terminals UE concerned by a broadcast
- QoS quality of service
- the processing device D according to the invention can be implemented in the form of electronic circuits, software (or computer) modules, or a combination of circuits and software.
- the radio access network of the broadcasting network is purely terrestrial.
- the invention also applies to purely satellite networks, as well as to hybrid networks comprising a satellite radio access network and a terrestrial radio access network, at least one of which is adapted to the data dissemination. It can thus be envisaged that the forward path of broadcasting is purely satellite (for example of the DVB-H type adapted to the satellite), whereas the return path is purely terrestrial (for example of the UMTS type), or vice versa.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR0653387A FR2905044B1 (fr) | 2006-08-17 | 2006-08-17 | Dispositif d'adaptation de schema(s) de modulation et d'encodage de donnees destinees a etre diffusees vers des terminaux de communication radio |
PCT/EP2007/057545 WO2008022860A1 (fr) | 2006-08-17 | 2007-07-20 | Dispositif d'adaptation de schéma(s) de modulation et d'encodage de données destinées à être diffusées vers des terminaux de communication radio |
Publications (1)
Publication Number | Publication Date |
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EP2055044A1 true EP2055044A1 (fr) | 2009-05-06 |
Family
ID=37891754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07787790A Withdrawn EP2055044A1 (fr) | 2006-08-17 | 2007-07-20 | Dispositif d'adaptation de schéma(s) de modulation et d'encodage de données destinées à être diffusées vers des terminaux de communication radio |
Country Status (5)
Country | Link |
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US (1) | US8483733B2 (fr) |
EP (1) | EP2055044A1 (fr) |
CN (2) | CN101517964B (fr) |
FR (1) | FR2905044B1 (fr) |
WO (1) | WO2008022860A1 (fr) |
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2006
- 2006-08-17 FR FR0653387A patent/FR2905044B1/fr not_active Expired - Fee Related
-
2007
- 2007-07-20 EP EP07787790A patent/EP2055044A1/fr not_active Withdrawn
- 2007-07-20 CN CN200780035019.8A patent/CN101517964B/zh active Active
- 2007-07-20 US US12/377,638 patent/US8483733B2/en active Active
- 2007-07-20 WO PCT/EP2007/057545 patent/WO2008022860A1/fr active Application Filing
- 2007-07-20 CN CN2007800305563A patent/CN101507299B/zh not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2008022860A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN101507299B (zh) | 2012-09-26 |
CN101507299A (zh) | 2009-08-12 |
WO2008022860A1 (fr) | 2008-02-28 |
FR2905044B1 (fr) | 2012-10-26 |
US8483733B2 (en) | 2013-07-09 |
CN101517964B (zh) | 2013-01-02 |
US20100285826A1 (en) | 2010-11-11 |
CN101517964A (zh) | 2009-08-26 |
FR2905044A1 (fr) | 2008-02-22 |
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