Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04H—BROADCAST COMMUNICATION
  • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
  • H04H20/02—Arrangements for relaying broadcast information
  • H04H20/08—Arrangements for relaying broadcast information among terminal devices
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
  • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
  • H04N21/44213—Monitoring of end-user related data
  • H04N21/44222—Analytics of user selections, e.g. selection of programs or purchase activity
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
  • H04N21/466—Learning process for intelligent management, e.g. learning user preferences for recommending movies
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
  • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
  • H04N21/47—End-user applications
  • H04N21/475—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data

Definitions

• the present invention relates to the field of broadcasting multimedia content such as audiovisual content, for example, for different types of fixed or mobile receivers.
• a content communication solution is sought from a single network of transmitters.
• DVB-T2 technology for “Digital Video Broadcasting - Terrestrial second generation” in English
• ATSC-MH for "Advance Television Systems Committee - Mobile / Handheld” in English
• ISDB-T for "Integrated Services Digital Broadcasting - Terrestrial” in English
• the hybrid broadcast mode is thus exploited in the United States under the ATSC-MH standard in which resources are shared between fixed and mobile services.
• the broadcasting of mobile services was introduced in an existing architecture initially dedicated to the broadcasting of fixed services.
• the resulting mobile coverage is of the "best-effort" type, which does not allow satisfactory delivery of mobile services.
• Japan which uses the ISDB-T / 1 seg standard, the broadcasting of mobile services is carried out without assurance of the resulting coverage area.
• ISDB-Tmm for Integrated Services Digital Broadcasting - Terrestrial Mobile Multimedia
• this evolution does not provide for a hybrid broadcast configuration and relies on the use of a dedicated network to mobile services, thus significantly increasing the cost of the global architecture dedicated to the broadcasting of fixed and mobile services.
• DVB-T technology allows hybrid broadcasting by the use of hierarchical modes, described in particular in the document “Hierarchical Modulation” by Alexander Schertz and Chris Week, EBU Technical Review Selection 2003.
• the dynamics associated with possible configurations is low.
• the DVB-T2 technology is adapted to the delivery of a parameterized signal for a given reception configuration: fixed, portable, mobile, or for a combination of two or more configurations in the same broadcast signal (broadcast hybrid).
• T2 Base For fixed reception (referred to as T2 Base) and mobile reception (referred to as T2 Lite), it can be expected an increase in comparable robustness or comparable robustness enhancement capability.
• T2 Lite For fixed reception (referred to as T2 Base) and mobile reception (referred to as T2 Lite), it can be expected an increase in comparable robustness or comparable robustness enhancement capability.
• T2 Base For fixed reception (referred to as T2 Base) and mobile reception (referred to as T2 Lite), it can be expected an increase in comparable robustness or comparable robustness enhancement capability.
• T2 Lite For fixed reception (referred to as T2 Base) and mobile reception (referred to as T2 Lite), it can be expected an increase in comparable robustness or comparable robustness enhancement capability.
• T2 Base For fixed reception (referred to as T2 Base) and mobile reception (referred to as T2 Lite), it can be expected an increase in comparable robustness or comparable robustness enhancement capability.
• T2 Lite For fixed reception (referred to as T2 Base) and mobile reception (referred to as T2 Lite),
• the present invention improves the situation.
• a first aspect of the invention relates to a method of broadcasting services to fixed and mobile receivers comprising, in a broadcasting network adapted for broadcasting to mobile receivers, the steps of:
• main broadcast component the main broadcast component being dedicated to a broadcast to mobile receivers
• complementary broadcast component the complementary broadcast component being dedicated to a broadcast to fixed receivers
• mobile receiver is intended to mean any receiver with an integrated or attached antenna, such as a mobile phone, such as a smartphone, or a PDA (Personal Digital Assistant). By extension it can be a receiver used in a mobility situation, and has an input for connecting an outdoor antenna, such as a car radio for example.
• fixed receiver any receiver connected to a fixed outdoor antenna, such as a roof antenna for example, intended to be usually used with a TV.
• Hybrid broadcasting can thus be implemented in a dense broadcast network for a broadcast initially designed for mobile receivers.
• the present invention can thus be implemented in an existing network comprising a fleet of broadcast antennas distributed to each cover a predetermined coverage area (cell).
• the main and complementary components can notably benefit from the contributions of the DVB-T2 standard which allow the allocation of respective robustness levels to the main component and the complementary component by using several independent PLPs (for "Physical Layer Pipes"). ). Indeed, a higher level of robustness in the case of reception by a mobile receiver (type T2-Lite broadcast) is generally required with respect to reception on a fixed receiver (T2-base type broadcasting).
• the DVB-T2 standard thus achieves a reception dynamic of the order of twenty decibels.
• the broadcast component main is set for broadcast at a first reception height and the complementary broadcast component is set to broadcast at a second reception height, the second height being greater than the first height.
• Such embodiments advantageously make use of a physical characteristic in which imposing a radio field at a first height induces a radio field greater than a second height greater than the first height.
• the sizing of a network initially dedicated to mobile receivers makes it possible to define a first level of radio field at the first height, and to benefit from a second high level of radioelectric field at the second height for reception by receivers. fixed.
• the invention makes it possible to take advantage of rooftop antennas used in particular in France, which are at altitude relative to mobile receivers.
• a larger capacity can be allocated for the complementary component, which is allowed by the contributions of the DVB-T2 standard according to which different levels of robustness can be used.
• first height may be less than 2 meters and the second height may be greater than 5 meters.
• the parameterization of the main component makes it possible to reach the mobile receivers situated preferentially at less than 2 meters height relative to the ground, which is a case of conventional use, while the parameterization of the complementary component makes it possible to reach fixed receivers at a higher altitude, for example at a height greater than 5 meters, which is representative of the height at which roof antennas are generally located.
• the heights are expressed relative to the ground and not absolutely. Indeed, in practice the area covered by a cell is characterized by uneven terrain.
• the method comprises the preliminary steps of setting the principal component to the first height:
• the predetermined coverage area may for example correspond to a cell of the mobile network to be covered, or to a plurality of cells in a single frequency exchange scheme or SFN (Single Frequency Network).
• the term "robustness value” means a robustness value in the C / N direction (for "Carrier to Noise” in English, ie signal-to-noise ratio).
• the parameterization steps also take into account a usage defined during sizing for mobile reception.
• a usage defined during sizing for mobile reception For example, in the case of a T2-Lite broadcast (for mobile receivers), the following uses can be considered: “Indoor”, “Outdoor”, “Mobile Incar”, “Car-rooftop”. They can be accompanied by variants with respect to the type of terminal and the reception quality targeted.
• Each of these uses has an impact on the required RF field level at the first height, at fixed robustness level.
• the defined usage and the first level of maximum capacity further impact the definition of the T2-Lite broadcast profile to mobile receivers and thus the first level of robustness required for broadcast to fixed receivers.
• the principle of the radio link budget is well known and will not be explained in the present application.
• the method further comprises the preliminary steps of setting the complementary component to the second height:
• these embodiments take advantage of the second radio field level raised to the second height, which flows directly from the first radio field level determined for the first height.
• the network is initially sized for broadcast to mobile receivers, and the second radio-frequency field level at the second height is used for service delivery to fixed receivers.
• a second level of robustness can be deduced, since a single use is used for fixed reception. This single use is intended for reception on roof antennas and it does not vary, unlike the plurality of uses intended for broadcasting to mobile receivers.
• the second level of robustness and the defined usage make it possible to define a T-Base broadcast profile for fixed receivers.
• a second maximum capacity level is derived from the T-Base broadcast profile.
• respective capacities are allocated to the main component and the complementary component according to the first and second maximum capacity values, and wherein the respective capacitors are dynamically allocated according to a load of data to convey.
• the assignment of respective capacities is static.
• the data load to be conveyed can be predefined from a profile defining respective requirements for the fixed and mobile receivers according to time slots.
• the respective capacities to be allocated to the main and complementary components can be predefined from profiles defining the distribution of consumption between the fixed and mobile receivers between different time slots.
• the complementary component and the main component are dedicated to the diffusion of linear and / or non-linear services.
• Linear service means radio-type services or television channels, streaming.
• non-linear service is meant a service that can be of the "push-video" type for example in which a content is transmitted to a receiver for storage and for subsequent consultation.
• the complementary component may be at least dedicated to broadcasting non-linear mobile services, and the method may further comprise the steps of:
• the main component may be at least dedicated to the broadcasting of linear mobile services, and the method may further comprise the steps of:
• the main component may be at least dedicated to the broadcast of linear mobile services, and the method may further comprise the steps of:
• This alternative makes it possible to rebroadcast the linear services received on a fixed antenna to mobile receivers.
• this alternative allows a continuity of service ("seamless handover" in English) when a user enters or leaves the area served by the rebroadcasting entity.
• the rebroadcast unit re-transmits at the same frequency the same single signal as that received by the fixed receiver.
• the single signal is re-transmitted on a different channel or in a frequency band different from that used for broadcasting the single signal in the broadcast network.
• a second aspect of the invention relates to a computer program comprising instructions for implementing the method according to the first aspect of the invention, when this program is executed by a processor.
• a third aspect of the invention relates to a device for broadcasting services to fixed and mobile receivers in a broadcast network adapted for broadcast to mobile receivers, the device comprising means:
• main broadcast component Defining a main broadcast component, the main broadcast component being dedicated to a broadcast to mobile receivers;
• complementary broadcast component being dedicated to a broadcast to fixed receivers
• the combining unit is further adapted to dynamically allocate respective capabilities on the main and complementary components.
• the device further comprises means for handling linear or non-linear contents in the form of a transport stream or in IP format, and the single signal can be distributed in T2-MI format.
• the single signal can then be transported in the broadcast network to suitable transmission units for processing data in T2-MI format and adapted to derive data to be transmitted via one or more UHF or VHF antennas, each dedicated to the cover of a cell.
• the single signal corresponds both to the signal generated in the T2-MI format and to the signal actually transmitted in the broadcast network via the transmitting antennas.
• a fourth aspect of the invention relates to a service broadcasting network comprising a service broadcasting device according to the third aspect of the invention, at least one fixed receiver and at least one mobile receiver, the broadcasting network being adapted to a broadcast to mobile receivers.
• FIG. 1 is a diagram showing the steps of a method of broadcasting services in a broadcast network adapted for broadcasting to mobile receivers, according to some embodiments;
• FIG. 2 illustrates a device for broadcasting services in a broadcasting network adapted for broadcasting to mobile receivers, according to some embodiments
• FIG. 3 illustrates a service broadcasting system according to certain embodiments
• - Figure 4 illustrates a docking station according to some embodiments
• FIG. 5 is a graph illustrating the variation of the distribution of capacity between fixed and mobile receivers for different mobile reception uses.
• FIG. 1 represents a method of broadcasting services according to some embodiments, in a broadcast network adapted for broadcasting to mobile receivers.
• a first maximum capacity value for the mobile services carried by the complementary component is determined.
• the definition of the first maximum value is related to the implementation of the invention and it thus varies according to predefined constraints, such as the fleet of available transmit antennas, a quality of service to be assured and characteristics of the receivers. targeted mobile.
• a usage is defined for the reception by the mobile receivers. (phone, PDA, etc).
• the following indicative uses include: “Good Indoor”, “Light Indoor”, “Outdoor”, “Mobile Incar”, etc., as well as their respective covered location rates in the coverage area.
• step 2 can be performed before step 1.
• a T2-Lite broadcast profile for the principal component is determined at a step 3 for the principal component, based on the first maximum capacity value and according to the defined usage.
• a first level of robustness (in the sense of robustness C / N) corresponding to the diffusion profile for the main component is defined. Indeed, the more the determined use is binding, typically of "Indoor” type, the higher the level of robustness required. In addition, the level of capacity is inversely proportional to the level of robustness. Thus, the robustness level derives directly from the diffusion profile determined from the first capacity level and the defined usage. for reception by mobile receivers.
• a first minimum radio-frequency field level over a predetermined coverage area (such as a cell for example) at a first height is determined according to the first level of robustness and according to the defined use, following a link budget principle.
• the first level of radio field is proportional to the requirement of the defined use and the first determined level of robustness.
• these mobile receivers are located near the ground, so that the first radio field level is estimated at a first height less than 2 meters.
• the first height may be equal to 1 meter 50 above the ground.
• a radio-frequency field strength of 81 dBpV / m is required at the first height, and 64dBpV / m for "Outdoor" use.
• the radio field level therefore depends directly on both the desired level of robustness and the defined usage.
• a different radio field level is defined to cover a predetermined coverage area, for a fixed level of robustness.
• the predetermined coverage area may correspond to a cell or a plurality of cells of the mobile network considered.
• Steps 1 to 14 can then be performed in an antenna dedicated to this cell, or in a centralized gateway connected to a plurality of transmission antennas covering a set of cells in an isofrequency or SFN broadcast scheme.
• a second minimum radio field level at a second reception height greater than the first height, can be estimated at a step 12.
• the second height can for example, to be greater than 5 meters above the ground, in order to preferentially reach fixed receivers fed from roof antennas over the predetermined coverage area for mobile reception.
• the second height may be equal to 10 meters.
• a second level of robustness is determined by function of the second level radio field and according to a use for fixed reception by roof antenna. Indeed, it can be considered a single use for the fixed reception, namely a reception use by roof antennas. Therefore, the level of robustness is determined directly from the second radio field level and the single use for fixed reception.
• a diffusion profile for the complementary component is determined as a function of the second level of robustness and as a function of the fixed roof antenna reception use.
• a second maximum capacity value corresponding to the diffusion profile for the complementary component is determined.
• Steps 1 to 9 can be iterated to meet predetermined scheduling constraints for example.
• a convergence towards an alignment of the coverage areas for the fixed and mobile services is thus advantageously obtained by taking advantage of the high radio field levels at 10 meters.
• respective capacities can be determined for broadcasting to fixed receivers at the second height and for broadcasting to mobile receivers at the first height, according to the first and second minimum field levels. radio.
• the respective capacities are respectively less than the first maximum capacity value and the second maximum capacity value.
• a lower level of robustness is generally required for the delivery of services to fixed receivers compared to mobile receivers, thereby increasing the delivery capabilities to fixed receivers.
• Step 10 may further consider environmental factors that may affect the second radio field level, such as the azimuth of the fixed receive antennas or a polarization crossing loss.
• the allocation of the respective capacities can be static or dynamic, according to the needs and the nature of the services conveyed. For example, it can be predicted that the allocation of the respective capacities depends on a data load to be conveyed, which can be predefined according to the respective needs for the fixed and mobile receivers according to time slots for example.
• a main broadcast component is defined, the main component being dedicated to a broadcast to mobile receivers.
• the main component is defined based on the level of robustness and capacity previously determined for broadcast to mobile receivers.
• a complementary broadcast component is defined, the complementary component being dedicated to a broadcast to fixed receivers.
• the complementary component is defined according to the level of robustness and capacity previously determined for broadcasting to fixed receivers.
• Each component can be used to convey services of the audio or video type, for example.
• These services can be linear (television, radio, streaming) or non-linear ("video push" type services, in which video content is received by a terminal for later viewing on a terminal).
• video push type services, in which video content is received by a terminal for later viewing on a terminal.
• Several services can be conveyed on each component, and each service can correspond to a level of robustness and a capacity which are specific to it, notably thanks to the use of several PLP (M-PLP for Multiple-PLP) within the meaning of the standard. DVB-T2.
• the main and complementary components may be combined in a single signal for broadcast in the broadcast network, at a step 13.
• the single signal may be broadcast in the network (typically in the predetermined coverage area) to the fixed and mobile receivers.
• step 15 the single signal can be received by the fixed and mobile receivers included in the predetermined coverage area.
• the non-linear mobile service can be stored in a connected storage unit to the fixed receiver, for subsequent transmission to a mobile receiver.
• the linear mobile services are relayed by a Wifi point connected to the fixed receiver in order to reach mobile receivers located nearby (in a WiFi coverage area) of the Wifi point.
• a rediffusion entity connected to the fixed receiver can rebroadcast the single signal in a predetermined perimeter (in a building for example) around the replay entity.
• the rebroadcasting entity can be equipped with a gap-filler function to enhance the coverage of mobile receivers inside buildings.
• an isofrequency rebroadcast of the single signal ensures continuity of service when a mobile receiver enters or leaves a building. Step 16 will be better understood with reference to the description of FIGS. 3 and 4.
• the retransmission of the single signal may be on a different channel or in a frequency band different from that used for the initial transmission of the single signal. .
• steps 1 to 14 allows convergence towards coverage area alignment for broadcast to fixed and mobile receivers, with significant gain in capacity overall.
• a mobile-only broadcast makes it possible to obtain a total capacity of 9.2 Mbit / s in the predetermined coverage area, according to a "Good Indoor" usage. , with a first radio field level of 81 dBpV / m at 1 meter 50.
• Such a first radio-frequency field level induces a second radio-frequency field level of about 92 dBpV / m at a height of 10 meters above ground level and thus a coverage area at least equivalent to that of diffusion to mobile receivers.
• the difference in radio-frequency field level between the first height and the second height is not always equal to 10 dB because it depends in particular on the topology of the network, and the geographical environment.
• the distribution 1 is a conventional broadcast to mobile terminals (type DVB-T2 Lite).
• Distributions 2, 3 and 4 relate to an implementation of an alternative hybrid broadcast, with various variations on the allocation of resources.
• the split 2 allows, by sacrificing just under 3 Mbit / s of capacity for the mobile services, to obtain a capacity on the fixed services of 13.8 Mbit / s, ie in the end a global capacity doubled compared to the distribution 1, without any modification of the architecture of the broadcast network originally adapted for broadcast to mobile receivers. It should be noted that a capacity for the main component of 6.5 Mbit / s corresponds to a capacity that would have been obtained with the DVB-H standard (for DVB-Handheld), for a condition of comparable use.
• the present invention benefits in addition to the fixed receivers located at the second height to increase the overall capacity of 13.8 Mbit / s compared to a scenario based on the DVB-H standard.
• the invention makes it possible to obtain a higher broadcasting capacity without modifying the initial broadcasting network.
• the capacity of the complementary component does not necessarily have the same value as the capacity of the main component, as it only carries services to fixed receivers.
• the nature of such services can be linear (radio, television), directly exploitable by conventional fixed terminals, such as televisions, connected to fixed receiving antennas.
• non-linear mobile services of the "push-video" type can be broadcast in the complementary component, in order to allow a subsequent use by mobile terminals, as explained above.
• Steps 1 to 14 may be implemented in a service broadcasting device 20 as shown in FIG. 2.
• a service broadcasting device 20 may be included in a broadcasting chain operating in the UHF (Ultra High Frequency) or VHF (Very High Frequency) bands. High Frequency) covering a given cell (predetermined coverage area).
• this device can be used at the scale of an isofrequency network or SFN (Single Frequency Network) in a plurality of cells.
• SFN Single Frequency Network
• the device 20 comprises a service reception interface 21, in the form of one or more transport streams or IP format components.
• Several linear and non-linear services can be processed for broadcast to fixed and mobile receivers.
• the device 20 comprises a parameterization unit 22 adapted to implement steps 1 to 14 of the method illustrated in FIG.
• the parameterization unit makes it possible to assign respective capacities and / or respective levels of robustness to the main and complementary components.
• the device 20 further comprises a first definition unit 23 of a main broadcast component dedicated to a broadcast to mobile receivers, from the linear and / or non-linear services received by the reception interface 21.
• the device comprises in parallel a second definition unit 24 of a diffusion component complementary dedicated to a broadcast to fixed receivers, from the linear and / or non-linear services received by the reception interface 21.
• the complementary broadcast component is dedicated to second-level broadcasting to fixed receivers, it comprises, according to certain embodiments of the invention, non-linear mobile services that can be stored for a subsequent transfer to a second station. mobile receiver, as explained later.
• the respective capacities and robustness levels defined by the parameterization unit 22 can then be assigned to the main and complementary components.
• the device 20 may further comprise a combination unit
• T2MI format signal for "Terrestrial 2 nd generation Modulator Interface" defined in the DVB standard.
• T2 for transport to the broadcast network.
• the T2-MI signal delivered by the combining unit 25 can then be transmitted to one or more broadcast units 26.1-26. n adapted to broadcast the single signal to fixed and mobile receivers, in UHF or VHF bands, for example.
• Each broadcast unit 26.1 -26. n is constituted by a DVB-T2 modulator associated with possible subsets of transposition, amplification, filtering in order to constitute a complete transmitter.
• Combination unit 25 and broadcast unit 26.1 may be geographically grouped if the broadcast network consists of a single cell covered by a single broadcast unit (for example broadcast unit 26.1), or if broadcast services may differ depending on the cells (insertion of local content, local or regional dropouts, etc.).
• Figure 3 shows a broadcast system of services in a broadcast network adapted for broadcast to mobile receivers, according to some embodiments.
• the system comprises a UHF or VHF band broadcasting antenna 30 preferably being connected to a broadcasting unit 26.1 -26. n according to the invention.
• a plurality of mobile receivers 31.1, 31.2 and 31.3 In the coverage area of the transmitting antenna 30 are included a plurality of mobile receivers 31.1, 31.2 and 31.3, and a fixed receiver 33.
• the mobile receivers 31. 1 -31 .3 are receivers with integrated or attached antennas, such as antennas of mobile phones, and the fixed receiver 33 is powered by a fixed antenna 32, installed on the roof of a house for example. Generally, such a roof antenna 32 is located at a height greater than 5 meters from the ground.
• the fixed receiver 33 also acts as a docking station, detailed with reference to FIG. 4.
• a second fixed receiver 34 such as a television set, can be connected to the fixed receiver 33 which then performs a "by" function. pass ".
• the mobile receivers 31.2 and 31.3 are located inside the house while the mobile receiver 31.1 is located on the outside.
• the radio field level at the first height of less than 2 meters must be set by default for Indoor use (Good Indoor or Light Indoor, for example). , which generally leads to expensive network deployment, (high site density, high overall energy consumption).
• a radio-frequency field of 81 dBpV / m at a height of 1 meter 50 allows, by allocating 6.5 Mbit / s of capacity for the main component, to obtain a capacity of 13, 8 Mbit / s for the complementary component.
• the complementary component may comprise non-linear mobile services, which can be stored in the docking station 33.
• the linear mobile services can then be transmitted with a capacity of 6.5 Mbit / s in the component main.
• 20.3 Mbit / s of overall capacity is obtained for mobile services.
• the complementary component may not only include non-linear mobile services, and may include linear fixed services such as television services. In this case, the decoding and display of these services are done in a conventional manner by the television 34.
• the docking station 33 can be adapted for wireless transmission of the main component of the only signal received by the fixed reception antenna 32.
• the Wifi transmission serves the mobile receivers 31 .2 and 31 .3.
• a reconfiguration at the antenna 30 makes it possible to set the first radio field level at 1 meter 50 for a less demanding use. Indeed, only mobile receivers located outside the house, in the coverage area, must receive directly (without passing through the docking station 33) the single signal comprising the main and complementary components.
• An "outdoor” type of use, with a coverage rate of 95% in the coverage area, for mobile receivers can then be selected, which makes it possible to reduce, at the same level of robustness, the first field level radio frequency at 1 meter 50 at 64 dBpV / m, which further decreases the second radio field level to 10 meters.
• the use of "indoor” type uses, which is expensive in terms of network deployment, is then advantageously avoided.
• the capacity allocated to the main component remains unchanged at 6.5 Mbit / s (still aligned with the DVB-H standard) while the capacity allocated to the complementary component is 4.5 Mbit / s.
• the complementary component can again be dedicated to non-linear mobile services for storage on the dock 33 and the main component can be dedicated to linear mobile services.
• the mobile receivers can receive the signal transmitted by the antenna 30 when they are outside the house and the Wifi signal including the main component emitted by the docking station when they are inside the house .
• Covered location rates are a probability of receiving the single signal for receivers located on the perimeter of the coverage area (cell).
• the docking station 33 can re-transmit the signal received by the fixed reception antenna 32 to the mobile receivers 31 .2 and 31 .3 located within a given perimeter (the house in this case) around the Docking station 33.
• the docking station 33 may be provided with a "gap-filler" function in order to reinforce the coverage of mobile receivers inside the house.
• the "gap-filler" function enables low power isofrequency retransmission within a given perimeter of a received signal.
• a direct rebroadcast of the single signal allows comparatively to a transmission via Wifi interface, a continuity of service when a mobile receiver comes out or enters the house. Indeed, the same signal is received outside from the antenna 30 and inside from the docking station 33.
• the reissue by the docking station 33 again reduces, at level of equal robustness , the first radio-frequency field level at 1 meter 50 at 64 dBpV / m, which further decreases the second radio field level to 10 meters.
• the capacity allocated to the main component remains unchanged at 6.5 Mbit / s (aligned with the DVB-H standard) while the capacity allocated to the complementary component is 4.5 Mbit / s.
• the frequency band in which the single signal is re-transmitted by the docking station 33 is distinct from the frequency band used for the broadcasting of the single signal by the antenna 30.
• Figure 4 illustrates the docking station 33 according to some embodiments.
• the docking station 33 comprises a reception interface 41 for receiving the single signal from the fixed reception antenna 32.
• the single signal can be processed conventionally by a DVB-T2 tuner 42, connected to a flash memory 44 and to a power supply 45.
• the flash memory 44 can be replaced by a hard disk.
• the docking station 33 further comprises an output interface 43 connected to the television 34 providing the "by-pass" function with respect to all the RF signals received by the fixed reception antenna 32, including for the provision of linear fixed services possibly included in the complementary component of the single signal (television services for example).
• the DVB-T2 tuner 42 is furthermore connected to a replay unit 46 fulfilling the "gap-filler" function described above, connected to an antenna 47.
• the re-broadcasting unit 46 thus makes it possible to retransmit the single signal in isofrequency. received from the fixed receiver 32 to the mobile receivers 31 .2 and 31 .3 located in the house.
• the docking station may comprise a conversion gateway 49 of the DVB-T2 signal into a Wifi signal that can be transmitted within a given perimeter (a house by example) by a Wifi access point 50.
• the local broadcasting of linear mobile services is then provided by Wifi to mobile receivers 31 .2-31 .3.
• the non-linear mobile services possibly received in the main component can be stored in a mass memory of the docking station 33 for subsequent retransmission to a mobile terminal by means of a mobile interface 48 such as a Dock type connector connected to the DVB-T2 tuner and hard disk via an electrical and protocol interface.
• a mobile interface 48 such as a Dock type connector connected to the DVB-T2 tuner and hard disk via an electrical and protocol interface.
• the restitution of non-linear services, received in the complementary component dedicated to fixed receivers, to mobile terminals is therefore permitted according to the invention.
• Indicator lights LED type for example
• this general principle can be transposed to other technologies such as the LTE (for "Long Term Evolution” in English) of the 3G standard. Since the deployment of this technology occurs in recently used frequency bands for the broadcast of television signals (UHF band), the second level radio field at roof height remains high and the present invention is then applicable when Receiving antennas fixed at this height are deployed.
• LTE Long Term Evolution
• FIG. 5 is a graph illustrating the variation of the distribution of the capacitances between fixed and mobile receivers for different uses of mobile reception, during a implementation by diffusion in UHF band.
• the capacity allocated to the mobile receivers is represented on the abscissa while the capacity allocated to the fixed receivers (complementary component) is represented on the ordinate.
• the graph presented takes into account the implementation of the docking station 33 shown in FIGS. 3 and 4.
• the capacity distribution varies in steps represented here in a simplified way according to a linear law, but the average slope depends on the defined usage for the mobile reception profile (DVB-T2 Lite).
• line 51 represents the distribution for Good Indoor use with a 95% coverage rate, requiring a first radio field level of 81 dBpV / m at 1 meter 50.
• Line 52 represents the distribution for use of the "Mobile Incar” type with a 99% coverage rate, requiring a first radio-frequency field level of 76 dBpV / m at 1 meter 50.
• the line 53 represents the distribution for a type of use " Good Indoor "with a 70% coverage rate, requiring a first radio field strength of 73 dBpV / m at 1 meter 50.
• the straight line 54 represents the distribution for a" Outdoor "type of use with a rate of 99% covered locations, requiring a first radio field level of 66 dB V / m at 1 meter 50.
• the capacities represented in area 55 are obtained.
• a capacity of 13.8 Mbit / s is obtained for the complementary component.
• a capacity of 1 1 Mbit / s is obtained for the complementary component.
• a capacity of 8.3 Mbit / s is obtained for the complementary component.
• a capacity of 5.8 Mbit / s is obtained for the complementary component.
• a capacity of 4.5 Mbit / s is obtained for the complementary component.
• the contributions of the invention can be further illustrated in the case of implementation in band III (VHF).
• VHF band III
• the broadcast network is sized to reach mobile radio receivers and the contribution for hybrid broadcast, with a fixed receive component for television sets is, is illustrated with reference to Table 2 below.
• the results are compared with T-DMB (Terrestrial Digital Multimedia Broadcasting) technology.
• the hybrid broadcast according to the invention makes it possible to obtain significant capacities for fixed reception (TV services remaining), and this, for first radioelectric field levels to be planned of the same order of magnitude as those to be planned for the technology. T-DMB.
• the configuration with 16 radio services allows an advantageous compromise.
• the number of co-channel radio is reasonable and the additional fixed reception capacity (25.7 Mbit / s) is comparable to that obtained for a DVB-T channel.
• the main advantages of a hybrid diffusion according to the invention are then: - higher broadcasting capacity (bit rate) than that provided by a network exclusively dedicated to broadcasting services to mobile receivers;

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• 2012
  • 2012-03-28 FR FR1252783A patent/FR2988939B1/fr active Active
• 2013
  • 2013-03-25 WO PCT/FR2013/050637 patent/WO2013144493A1/fr active Application Filing
  • 2013-03-25 EP EP13719921.2A patent/EP2832017A1/de not_active Ceased

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