WO2022240366A1 - A method of controlling the transmission and reception of broadcast or multicast telecommunications radio services and a system of devices for performing this method - Google Patents

A method of controlling the transmission and reception of broadcast or multicast telecommunications radio services and a system of devices for performing this method Download PDF

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Publication number
WO2022240366A1
WO2022240366A1 PCT/SK2022/050006 SK2022050006W WO2022240366A1 WO 2022240366 A1 WO2022240366 A1 WO 2022240366A1 SK 2022050006 W SK2022050006 W SK 2022050006W WO 2022240366 A1 WO2022240366 A1 WO 2022240366A1
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Prior art keywords
broadcast
modulator
signal
reception
transmission
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PCT/SK2022/050006
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French (fr)
Inventor
Dušan STATELOV
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Maindata, Spol. S R.O.
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Publication of WO2022240366A1 publication Critical patent/WO2022240366A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/68—Systems specially adapted for using specific information, e.g. geographical or meteorological information
    • H04H60/71—Systems specially adapted for using specific information, e.g. geographical or meteorological information using meteorological information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/11—Arrangements for counter-measures when a portion of broadcast information is unavailable

Definitions

  • the invention relates to the field of telecommunications, and more specifically to broadcast and digital television services as well as multicast IP network services. More specifically, the invention relates to a method of adjusting the composition and compression of multiplex programs based on social preferences, including adjusting the signal strength and the resulting bitrate depending on the weather.
  • a link budget for 99.5% service availability means that signal is available 99.5% of time throughout whole one year.
  • the worst weather in certain geographical area is determined for a period of one year.
  • the signal strength also known as Signal-to-noise ratio (SNR) or Carrier-to-noise ratio (C/N)
  • SNR Signal-to-noise ratio
  • C/N Carrier-to-noise ratio
  • EIRP Effective Isotropic Radiated Power
  • modulation and coding which together ensure the required signal strength.
  • This method of transmission corresponds to a constant transmission bitrate. On one hand, this method does not allow the signal to be amplified in bad weather, which means that the reception may be lost or interrupted in such conditions. On the other hand, capacity is wasted in good weather, as it would be sufficient to use a much weaker signal. Using weaker signal would allow increase the bitrate and thus there would be possibility to increase the number or quality of services.
  • the multilayer central controller which has information on the status of reception conditions in various locations, viewership of individual services as well as the weather forecasts, will set a weaker broadcast signal with higher bitrate at the output of the broadcast services center. In bad weather, it sets a stronger EIRP signal, modulation and coding, with lower bitrate at a broadcast services center.
  • the multilayer central controller When deciding on the omission and retention of services, as well as when adjusting the quality of compression, the multilayer central controller will also consider the viewership of services, which is objectively measured by the so-called "people meters" using cue tones. This can be in either in real time or on the basis of longer- term statistical measurements.
  • the multilayer central controller may prioritize broadcast of live channels and omitting pre-recorded programs. In good weather, it is possible to either add additional audio video services, increase the quality of compression, or include data services, e.g., push video on demand (VOD).
  • VOD push video on demand
  • One aspect of this invention is a method of controlling the transmission of broadcast or multicast telecommunications radio services, i.e., services intended for a large number of receivers, wherein depending on the transmission conditions of the signal, the multilayer central controller, which receives information about the transmission conditions from various sources such as for example receivers, program viewership meters, weather measurement and forecasting system, on one hand sets the parameters of radio signal of the transmitter via the control channel of the transmitter, modulated signal of the modulator, in particular modulation and coding directly via the control channel of the modulator or via the encapsulator, specifically via the control channel of the encapsulator, so as to ensure excellent reception of the radio signal for as many or all receivers as possible, at the highest possible spectral efficiency, and on the other hand sets the highest possible transport stream rate corresponding to the transmitter and modulator settings of the broadcast services center, for example the statistical multiplex transport stream bitrate, by including or excluding individual services from broadcasting, with a parallel level of metadata editing (e.g., SI / PSI tables), or even
  • the receiver in case of loss of radio signal reception and detected trend of decrease of signal strength or smaller than predefined difference between measured and minimum signal strength (signal-to-noise ratio), according to the relevant standard, switches the coding setting while maintaining the same frequency, symbol rate and modulation to the nearest coding values corresponding to one step more resistant coding, in subsequent steps, and after exhausting the possibilities on the given modulation switches to nearest, more resistant, modulation, and subsequently with gradual amplification of the coding, in cycles up until successful tuning of the signal; and in the event of a detected increase in signal strength or greater than a predefined difference between the last measured and minimum signal strength value, the coding setting switches to the nearest coding values corresponding to one step less resistant signal, while maintaining the same frequency, symbol rate and modulation, and after trying all possible coding settings, it switches to the one step less resistant modulation, with a gradual weakening of the coding, in subsequent cycles, until the signal is successfully tuned, while in case of unsuccessful tuning in the previous steps it gradually tries all
  • the multilayer central controller determines the attenuation of the radio signal for a given service area on the basis of data from the weather measurement and forecasting system.
  • the signal attenuation for the selected service area is calculated by the weather measurement and forecasting system by recalculating the radar meteorological measurements, for the determined radio signal transmission directions.
  • the radio signal is transmitted in succession or in parallel by satellite, terrestrial, mobile or other wireless networks, wherein the radio signal can be transmitted by several radio networks, for example by satellite sequentially or in parallel by terrestrial transmitters, in which situation the multilayer central controller evaluates the attenuation of the radio signal in the multiple networks used.
  • the multilayer central controller determines the parameter settings of the modulator indirectly via the broadcast services center, either on the basis of signalling embedded in the transport stream or based on the overall transport stream rate, based on which the modulator selects such transmission parameters, in particular modulation and coding, which corresponds to or most closely exceeds the bitrate of the broadcast services center, and aligns it with zero packets.
  • the multilayer central controller determines the current transmission parameters of the radio signal by means of several receivers connected by a return line to the multilayer central controller.
  • the current transmission parameters of the radio signal in a given territory are ascertained by means of an customer technical support center by voice or in another form, for example by web reports.
  • other possible transmission parameters in case of loss of signal of the receiver are obtained in additional signalling specific to the given communication standard (e.g. in service tables (SI) or program-specific PSI tables) before changing transmission parameters such as modulation and coding.
  • SI service tables
  • PSI program-specific PSI tables
  • the multilayer central controller receives information on current signal transmission conditions from various sources such as receivers and/or program viewership meters and/or a weather measurement and forecasting system and/or customer technical support center, and statistically evaluates them, wherein
  • the multilayer central controller reduces the signal-to-noise ratio value by reducing the modulation scheme and/or increasing the coding robustness of the modulated signal of modulator to predefined values, directly through the control channel of modulator or via the encapsulator via the control channel of encapsulator and correspondingly reducing the output bitrate of the transport stream of the broadcast services center to match the modulator setting, and/or (optionally) increases the radiated radio signal power of the transmitter through the control channel of transmitter; and
  • the multilayer central controller increases the signal-to-noise ratio value to a predefined value by increasing the modulation scheme and/or decreasing the coding robustness of the modulation signal of modulator, directly via the control channel of modulator, or via the encapsulator via the control channel of encapsulator, and accordingly increases the output bitrate of the transport stream of the broadcast services center to match the setting of the modulator, and/or (optionally) decreases the radiated radio signal power of the transmitter through the control channel of the transmitter; to ensure successful radio reception for as many receivers as possible, with the highest possible spectral efficiency.
  • the critical level of transmission conditions (the level at which the modulator/transmitter parameters need to be changed) is considered to be the level of the minimum required value of the signal-to-noise ratio for a given combination of modulation scheme and coding, increased by the safety reserve.
  • Critical level minimum required signal-to-noise ratio value for a given combination of modulation scheme and coding + safety reserve.
  • the minimum required value of the signal-to-noise ratio for signal reception is given by a combination of modulation scheme and coding. The higher the spectral
  • safety reserve is meant a signal-to-noise ratio value by which the minimum required signal-to-noise ratio value is increased in order to ensure reliable signal reception. Further increasing the signal-to-noise ratio does not significantly improve reception under the given transmission conditions.
  • the safety reserve is set by the transmission network operator, e.g., 2dB, or otherwise in relation to the minimum value.
  • the predefined values of the modulation scheme and coding correspond to the minimum signal-to-noise ratio value determined for the individual combinations of the modulation scheme and coding increased by the value of the safety reserve.
  • bitrate of the transport stream is varied:
  • the multilayer central controller favors live broadcasts and/or services with higher viewership, detected either online or statistically over a longer period by viewership meters.
  • the weather measurement and forecasting system calculates the transmission conditions by recalculating the radar meteorological measurements for the determined directions of radio signal transmission.
  • the radio signal is transmitted sequentially or simultaneously by satellite, terrestrial, mobile or other wireless networks, wherein the radio signal can be transmitted by several radio networks such as satellite sequentially, or also
  • the multilayer central controller evaluates the transmission conditions of radio broadcasts in two or more networks.
  • the multilayer central controller determines the modulation scheme and/or coding settings of the modulator indirectly via the broadcast services center, either based on signaling embedded in the transport stream, or based on the overall base band transport rate - BBF (base band frame), on the basis of which the modulator selects such transmission parameters, in particular modulation and coding, which corresponds to or most closely exceeds the bitrate of the transport stream of the broadcast services center and aligns it with zero packets.
  • the current transmission conditions of the radio broadcast in the given territory are determined by means of the customer technical support center by voice or in another form, for example by web reports.
  • a) increases the coding robustness step by step, one level at the time, while maintaining the same frequency, symbol rate and modulation scheme, and after using up all coding options on the given modulation scheme, b) reduce the modulation scheme by one level while maintaining the same frequency and symbol rate; and c) repeat steps a) and b) until the radio broadcast is successfully tuned;
  • d) reduces the coding robustness by one level while maintaining the same frequency, symbol rate and modulation scheme, and after using up all coding options on the given modulation scheme,
  • the receiver is before a planned change informed of the future setting of the modulation scheme and modulator coding by means of additional signaling specific to the given communication standard, preferably in service tables SI or in program-specific tables PSI.
  • FIG. 1 Further aspect of this invention is a system of devices for performing the method according to the present invention, comprising of multilayer central controller, broadcast services center, or also transmitter, modulator, encapsulator, receivers, viewership meter, weather measurement and forecasting system, customer technical support center, wherein the multilayer central controller for receiving data, their evaluation and control, on one hand receives information from one or more of the following data sources, such as receivers for receiving and measuring radio signal strength, viewership meters for measuring program audiences, weather measurement and forecasting system, customer technical support centers which evaluates and on the other hand manages the broadcast service center for compressing audio video programs and multiplexing services into a transport stream, or an encapsulator for encapsulating packets in a second layer transport stream, or a modulator for modulating the signal or also a transmitter for transmitting the radio signal.
  • the multilayer central controller for receiving data, their evaluation and control, on one hand receives information from one or more of the following data sources, such as receivers for receiving and measuring radio signal strength, viewership meters for measuring
  • the system according to the invention comprises of a receiver and a viewership meter which are combined into a single device for transmitting data about the level of the received radio broadcast signal, as well as about the currently watched television program, to the multilayer central controller.
  • another aspect of this invention is a system of devices for performing a method of controlling the transmission and reception of broadcast or multicast telecommunications radio services comprising a multilayer central controller
  • the receiver is also a source of information about the current transmission conditions.
  • the source of information about the current transmission conditions can be, for example, the viewership meter, the weather measurement and forecasting system, or the customer technical support center.
  • the receiver and the viewership meter are preferably combined into a single device for sending data about the level of the received radio broadcast signal as well as about the currently watched television program to the multilayer central controller.
  • an encapsulator is located between the broadcast services center and the modulator, connected via the control channel of encapsulator to the multilayer central controller.
  • the communication link between the encapsulator and the modulator is preferably bidirectional.
  • Control channels can be one-way or two-way channels.
  • the control channel of the transmitter, the control channel of the modulator, the control channel of the broadcast services center and the control channel of the encapsulator are bidirectional channels and the control channel of the receiver, the control channel of the viewership meter, the control channel of the weather measurement and forecasting system and the control channel of the customer technical support center can be one-way or two-way channels.
  • the bitrate of the transport stream can be changed by adding or excluding certain services from the broadcast services center with concurrent modification of SI/PSI tables, and/or by changing the audio and video compression level settings of
  • Figure 1 shows a system for transmitting and receiving broadcast and multicast services with multilayer adaptation according to the invention.
  • Figure 2 shows a system for transmitting and receiving broadcast and multicast services with multilayer adaptation according to the invention with indirect control of the modulator settings via the encapsulator.
  • Figure 3 shows the dependence of the transport stream bitrate on the weather
  • Figure 4 shows an example of changes in signal attenuation during the day depending on the weather conditions.
  • Figure 5 shows the adaptive selection of services with dependence on bitrate, modulation, coding, which depends on signal attenuation (weather), with priority of live services and services with higher viewership in the case of statistical multiplex.
  • Figure 6 shows a flow chart of the principle of operation of the system according to the invention.
  • Figure 7 shows a flow chart of the principle of autonomous operation of the receiver in the event of loss of radio reception.
  • the multilayer central controller 10 sets the strength of the radio signal LI with a predefined safety reserve, e.g., value of 2 dB. It subtracts this safety reserve from the minimum required signal strength for a given attenuation.
  • C/N signal-to-noise ratio
  • the multilayer central controller 10 sets the highest possible transport stream L3 bitrate of the broadcast service center 3, corresponding to the settings of the transmitter 1 and the modulator 2, for example the statistical multiplex transport stream L3 bitrate. Based on the magnitude of the change in the bitrate of the transport stream L3, it proceeds to either add or remove individual services from the multiplex in the transport stream L3 while modifying the metadata in the transport stream L3, e.g. SI/PSI tables for DVB systems, or just to change the audio and video compression level settings of individual services, or priorities within the statistical multiplex of the transport stream L3, or all at once.
  • the multilayer central controller 10 prioritizes live broadcasting services and services with higher viewership, which it detects either online in real time or statistically over a longer period, with viewership meters 5. Viewership meter 5s, or so-called people
  • Example 2 It is similar to Example 1, with the difference that the multilayer central controller 10 does not control the modulator 2 directly, but via the encapsulator 8, specifically via the control channel C8 of the encapsulator, as illustrated in Figure 2.
  • the encapsulator 8 inserts MPEG TS (transport stream) packets into BBF (baseband frame) frames, which contain modulation and coding settings in the header section.
  • MPEG TS transport stream
  • BBF baseband frame
  • Example 1 Is similar to Example 1 and Example 2, except that the receiver 4, in case of loss of the radio signal LI, tries to tune by changing the modulation and coding while maintaining the frequency and symbol rate according to the situation.
  • the receiver 4 starts switching the coding settings to the nearest coding values. For example, with the DVB-S2 standard and 8PSK modulation, it changes the coding from 9/10 to 8/9. If the receiver manages to tune the radio signal, it will remain tuned until the next signal is lost. If it fails to tune, the receiver 4 changes the coding by another step from 8/9 to 5/6. If it fails to tune again, it changes the coding setting further to 3/4, then 2/3. If the radio signal reception cannot be tuned in even then, it will also change the modulation from 8PSK to 4PSK (QPSK) with coding 4/5, 2/3 or 1/2.
  • QPSK modulation from 8PSK to 4PSK
  • the radio signal LI is strong and the signal was lost, it can be assumed that the signal was lost by intentionally adjusting the modulation and coding of the modulator 2 to values allowing a higher bitrate (i.e., spectral efficiency).
  • the reaction of the receiver 4 will be similar in this case, but it will be realized in the opposite direction. In this case, the receiver 4 switches the coding settings while maintaining the same symbol rate to the nearest coding values and later also to the modulations
  • the evaluation of whether the signal is weak or strong before the loss of the signal, and thus whether to try to tune the stronger or weaker signal can be determined by comparing the values of the signal strength from the values of C/N (i.e., SNR) for a certain period of time. If, for example, the weighted average of the values for the last 5-10 minutes decreased, it follows that the outage was caused by worsening weather and the receiver will gradually look for a stronger signal (with a lower bitrate).
  • an alternative indication of weather degradation is a comparison of the signal strength of the last measured C/N or SNR value with the table values of the minimum signal strength for a given combination of modulation and coding. If the difference is close to the minimum value, it corresponds to worsening of weather conditions. If the table value for a given modulation and coding is 11 dB, the set limit 2dB, and the last measured value was 12.3 dB, then we will consider this as a loss of signal due to bad weather conditions.
  • the last measured value is more than 13 dB, for example 13.6 dB, at a minimum value of 11 dB, so that the difference between the set value 2dB is greater than 0 dB, it will logically change the setting in order to achieve a higher bitrate on the transmitting side.
  • Example 2 It is similar to Example 1, except that the multilayer central controller 10 prioritizes live broadcasts and services with bigger audience detected by the viewership meter 5, either online or statistically over time, when deciding on the inclusion and quality of individual services, pre-recorded services or time-shifted services.
  • Example 14 It is similar to Example 1, except that the multilayer central controller 10 detects radio signal LI attenuation for several selected locations of receivers 4 based on the weather measurement and forecasting system 6, from which it calculates signal attenuation in given directions for selected locations of receiver 4 based on the direction of the transmitted radio signal LI.
  • the direction of signal propagation is calculated for the direction between a particular geostationary satellite and receiver 4 or also between terrestrial transmitter 2 and receiver 4.
  • the broadcast radio signal LI is transmitted sequentially or in parallel by satellite, terrestrial, mobile or other wireless networks
  • the radio signal LI can be transmitted by several radio networks, for example by satellite sequentially or in parallel by terrestrial transmitters.
  • One example is the transmission of a signal by satellite transmission to terrestrial broadcast transmitters, from where it transmits terrestrially. Simultaneous transmission of satellite and terrestrial signals allows e.g., DVB standard "Single Illumination". In these situations, the multilayer central controller 10 evaluates the signal attenuation in the multiple transmission networks.
  • Example 2 It is similar to Example 1, except that the multilayer central controller 10 determines the parameter settings of the modulator 2 indirectly via the broadcast services center 3, based on the total bitrate of the transport stream L3, on the basis of which the modulator 2 selects the modulation and coding that corresponds or most closely exceeds the bitrate of the transport stream L3 of the broadcast services center 3.
  • Example 2 It is similar to Example 1, except that the multilayer central controller 10 detects the current attenuation of the radio signal LI by means of several receivers 4 connected by a return line to the multilayer central controller 10.
  • Example 15 It is similar to Example 1, except that it determines the current transmission parameters of the radio signal LI in a given area by means of the customer technical support center 7 by voice or in another form, for example by web reports.
  • the invention makes it possible to increase the availability of basic services even during very bad weather conditions, in cases when otherwise the reception of all services would fail, and on the other hand to increase the quality and number of services in good weather conditions, when there is low signal attenuation.

Abstract

The invention is concerned with adjusting the composition and compression of multiplex programs based on social preferences, including adjusting the signal strength and bitrate as a function of weather. The described solution improves on one hand the availability and on the other hand the spectral efficiency of broadcasting and multicast services in various radio networks such as satellite TV, terrestrial TV network, mobile networks and wifi multicast networks. It makes it possible to increase the availability of the most preferred services during very bad weather conditions, when the reception of all services would be lost, and on the other hand to increase the quality and number of services in good weather with low signal attenuation.

Description

A method of controlling the transmission and reception of broadcast or multicast telecommunications radio services and a system of devices for performing this method
Technical Field
The invention relates to the field of telecommunications, and more specifically to broadcast and digital television services as well as multicast IP network services. More specifically, the invention relates to a method of adjusting the composition and compression of multiplex programs based on social preferences, including adjusting the signal strength and the resulting bitrate depending on the weather.
Background Art
Currently for broadcast transmission, such as via satellite or terrestrial towers, operators estimate the so-called link budget, resulting in signal strength setting which reflects desired signal (service) availability during a year expressed as a percentage value. For example, a link budget for 99.5% service availability means that signal is available 99.5% of time throughout whole one year. According to the weather models of International Telecommunication Union (ITU), the worst weather in certain geographical area is determined for a period of one year. Then, according to this worst estimated weather, the signal strength, also known as Signal-to-noise ratio (SNR) or Carrier-to-noise ratio (C/N), must be provided throughout the year to achieve the required service availability. Based on this estimated signal strength, a combination of transmission parameters is set for the whole year, including Effective Isotropic Radiated Power (EIRP), modulation and coding, which together ensure the required signal strength. This method of transmission corresponds to a constant transmission bitrate. On one hand, this method does not allow the signal to be amplified in bad weather, which means that the reception may be lost or interrupted in such conditions. On the other hand, capacity is wasted in good weather, as it would be sufficient to use a much weaker signal. Using weaker signal would allow increase the bitrate and thus there would be possibility to increase the number or quality of services.
1 Broadcast systems currently do not allow synchronization of settings of the transmitter and modulator with the settings of the broadcast services center, and they also do not allow changes of settings during transmission. However, there are already large differences in transmission bitrates in the basic modulations, for example DVB-S2 in accordance with the EN 302 307 standard supported by common satellite receivers 4PSK (QPSK) and 8PSK. For example, 36 MHz transponder with 30 Msymb/s at 20% roll off allows to transmit in good weather conditions (i.e., with low signal attenuation) transport stream with bitrate of over 80 Mbps and in very bad weather conditions with bitrate of only 30 Mbps. Because of the large difference in bitrate, it is not appropriate to reduce the bitrate using audio video compression alone, as contemplated by current solutions. Current solutions propose to adapt the bitrate of the multiplex only by increasing the compression ratio of the services, which results in a decrease of the bitrate. In a bad weather conditions (i.e., high signal attenuation), it can lead to a reduction of service quality to an unacceptable level. It is therefore necessary to have a mechanism to change the number of individual services within given multiplex.
Current solutions allow to respond only to current changes in the weather, but do not consider using weather forecasts to be able to respond in advance to the expected situation and thus shorten signal loss times. Current solutions also do not suggest a specific logic for the selection of television services.
Disclosure of Invention
These shortcomings can be substantially eliminated by a method of transmitting broadcast services in which the modulator and the transmitter do not transmit the signal with constant signal strength, such as constant radiated power, signal modulation or coding, but change these values adaptively according to the current signal attenuation conditions, mainly determined by the current weather conditions. The multilayer central controller, which has information on the status of reception conditions in various locations, viewership of individual services as well as the weather forecasts, will set a weaker broadcast signal with higher bitrate at the output of the broadcast services center. In bad weather, it sets a stronger EIRP signal, modulation and coding, with lower bitrate at a broadcast services center.
2 However, when the differences in bitrates are large (e.g., 80 Mbps vs. 30 Mbps), some services are removed from the broadcast multiplex in bad weather and added back in good weather.
When deciding on the omission and retention of services, as well as when adjusting the quality of compression, the multilayer central controller will also consider the viewership of services, which is objectively measured by the so-called "people meters" using cue tones. This can be in either in real time or on the basis of longer- term statistical measurements. The multilayer central controller may prioritize broadcast of live channels and omitting pre-recorded programs. In good weather, it is possible to either add additional audio video services, increase the quality of compression, or include data services, e.g., push video on demand (VOD).
Our solution also solves the algorithm of tuning TV receivers whose receivers (tuners) cannot automatically detect the modulation and coding change.
One aspect of this invention is a method of controlling the transmission of broadcast or multicast telecommunications radio services, i.e., services intended for a large number of receivers, wherein depending on the transmission conditions of the signal, the multilayer central controller, which receives information about the transmission conditions from various sources such as for example receivers, program viewership meters, weather measurement and forecasting system, on one hand sets the parameters of radio signal of the transmitter via the control channel of the transmitter, modulated signal of the modulator, in particular modulation and coding directly via the control channel of the modulator or via the encapsulator, specifically via the control channel of the encapsulator, so as to ensure excellent reception of the radio signal for as many or all receivers as possible, at the highest possible spectral efficiency, and on the other hand sets the highest possible transport stream rate corresponding to the transmitter and modulator settings of the broadcast services center, for example the statistical multiplex transport stream bitrate, by including or excluding individual services from broadcasting, with a parallel level of metadata editing (e.g., SI / PSI tables), or even changes to the audio and video compression settings of individual services or a priority within the statistical multiplex, wherein the multilayer central controller favors live broadcasts and high-frequency survey
3 services in the decision-making process, either online or statistically over a longer period by viewership meters.
According the preferred embodiment of this inventive method the receiver in case of loss of radio signal reception and detected trend of decrease of signal strength or smaller than predefined difference between measured and minimum signal strength (signal-to-noise ratio), according to the relevant standard, switches the coding setting while maintaining the same frequency, symbol rate and modulation to the nearest coding values corresponding to one step more resistant coding, in subsequent steps, and after exhausting the possibilities on the given modulation switches to nearest, more resistant, modulation, and subsequently with gradual amplification of the coding, in cycles up until successful tuning of the signal; and in the event of a detected increase in signal strength or greater than a predefined difference between the last measured and minimum signal strength value, the coding setting switches to the nearest coding values corresponding to one step less resistant signal, while maintaining the same frequency, symbol rate and modulation, and after trying all possible coding settings, it switches to the one step less resistant modulation, with a gradual weakening of the coding, in subsequent cycles, until the signal is successfully tuned, while in case of unsuccessful tuning in the previous steps it gradually tries all combinations of modulation and coding in regular cycles until a successful tuning.
According the further preferred embodiment of this method, the multilayer central controller determines the attenuation of the radio signal for a given service area on the basis of data from the weather measurement and forecasting system.
According the further preferred embodiment of this method, the signal attenuation for the selected service area is calculated by the weather measurement and forecasting system by recalculating the radar meteorological measurements, for the determined radio signal transmission directions.
4 According the further preferred embodiment of this method, the radio signal is transmitted in succession or in parallel by satellite, terrestrial, mobile or other wireless networks, wherein the radio signal can be transmitted by several radio networks, for example by satellite sequentially or in parallel by terrestrial transmitters, in which situation the multilayer central controller evaluates the attenuation of the radio signal in the multiple networks used.
According the further preferred embodiment of this method, the multilayer central controller determines the parameter settings of the modulator indirectly via the broadcast services center, either on the basis of signalling embedded in the transport stream or based on the overall transport stream rate, based on which the modulator selects such transmission parameters, in particular modulation and coding, which corresponds to or most closely exceeds the bitrate of the broadcast services center, and aligns it with zero packets.
According the further preferred embodiment of this method, the multilayer central controller determines the current transmission parameters of the radio signal by means of several receivers connected by a return line to the multilayer central controller.
According the further preferred embodiment of this method, the current transmission parameters of the radio signal in a given territory are ascertained by means of an customer technical support center by voice or in another form, for example by web reports.
According the further preferred embodiment of this method, other possible transmission parameters in case of loss of signal of the receiver are obtained in additional signalling specific to the given communication standard (e.g. in service tables (SI) or program-specific PSI tables) before changing transmission parameters such as modulation and coding.
In particular, the method of controlling the transmission and reception of broadcast or multicast telecommunication radio services according to the invention is
5 characterized in that, the multilayer central controller receives information on current signal transmission conditions from various sources such as receivers and/or program viewership meters and/or a weather measurement and forecasting system and/or customer technical support center, and statistically evaluates them, wherein
- if the transmission conditions deteriorate below the critical level, given by the sum of the minimum required signal-to-noise ratio value for signal reception and a safety reserve, the multilayer central controller reduces the signal-to-noise ratio value by reducing the modulation scheme and/or increasing the coding robustness of the modulated signal of modulator to predefined values, directly through the control channel of modulator or via the encapsulator via the control channel of encapsulator and correspondingly reducing the output bitrate of the transport stream of the broadcast services center to match the modulator setting, and/or (optionally) increases the radiated radio signal power of the transmitter through the control channel of transmitter; and
- when the transmission conditions improve above the critical level, the multilayer central controller increases the signal-to-noise ratio value to a predefined value by increasing the modulation scheme and/or decreasing the coding robustness of the modulation signal of modulator, directly via the control channel of modulator, or via the encapsulator via the control channel of encapsulator, and accordingly increases the output bitrate of the transport stream of the broadcast services center to match the setting of the modulator, and/or (optionally) decreases the radiated radio signal power of the transmitter through the control channel of the transmitter; to ensure successful radio reception for as many receivers as possible, with the highest possible spectral efficiency.
The critical level of transmission conditions (the level at which the modulator/transmitter parameters need to be changed) is considered to be the level of the minimum required value of the signal-to-noise ratio for a given combination of modulation scheme and coding, increased by the safety reserve.
Critical level = minimum required signal-to-noise ratio value for a given combination of modulation scheme and coding + safety reserve.
The minimum required value of the signal-to-noise ratio for signal reception is given by a combination of modulation scheme and coding. The higher the spectral
6 efficiency of the combination of modulation scheme and coding, the more "clear" signal is required, i.e., the greater the signal-to-noise ratio for successful reception. By safety reserve is meant a signal-to-noise ratio value by which the minimum required signal-to-noise ratio value is increased in order to ensure reliable signal reception. Further increasing the signal-to-noise ratio does not significantly improve reception under the given transmission conditions. The safety reserve is set by the transmission network operator, e.g., 2dB, or otherwise in relation to the minimum value.
The predefined values of the modulation scheme and coding correspond to the minimum signal-to-noise ratio value determined for the individual combinations of the modulation scheme and coding increased by the value of the safety reserve.
According to the preferred embodiment of the method according to present invention, the bitrate of the transport stream is varied:
- by adding or excluding certain services from the transmission of the broadcast services center while modifying the SI/PSI tables, and/or
- by changing the audio and video compression level settings of each service, and/or,
- by changing the priority of a particular service in the case of a statistical multiplex.
According to the further preferred embodiment of this method according to the invention, the multilayer central controller favors live broadcasts and/or services with higher viewership, detected either online or statistically over a longer period by viewership meters.
According to the further preferred embodiment of this method according to the invention, the weather measurement and forecasting system calculates the transmission conditions by recalculating the radar meteorological measurements for the determined directions of radio signal transmission.
According to the further preferred embodiment of this method according to the invention, the radio signal is transmitted sequentially or simultaneously by satellite, terrestrial, mobile or other wireless networks, wherein the radio signal can be transmitted by several radio networks such as satellite sequentially, or also
7 simultaneously, by terrestrial transmitters, whereby the multilayer central controller evaluates the transmission conditions of radio broadcasts in two or more networks.
According to the further preferred embodiment of this method according to the invention, the multilayer central controller determines the modulation scheme and/or coding settings of the modulator indirectly via the broadcast services center, either based on signaling embedded in the transport stream, or based on the overall base band transport rate - BBF (base band frame), on the basis of which the modulator selects such transmission parameters, in particular modulation and coding, which corresponds to or most closely exceeds the bitrate of the transport stream of the broadcast services center and aligns it with zero packets.
According to the further preferred embodiment of this method according to the invention, the current transmission conditions of the radio broadcast in the given territory are determined by means of the customer technical support center by voice or in another form, for example by web reports.
According to the further preferred embodiment of this method according to the invention,
- receiver in case of loss of reception of the radio transmission due to gradual deterioration of reception of the radio transmission: a) increases the coding robustness step by step, one level at the time, while maintaining the same frequency, symbol rate and modulation scheme, and after using up all coding options on the given modulation scheme, b) reduce the modulation scheme by one level while maintaining the same frequency and symbol rate; and c) repeat steps a) and b) until the radio broadcast is successfully tuned; and
- receiver in case of loss of radio reception in the situation of gradual improvement of radio signal due to change of modulation scheme and/or coding setting on the modulator side: d) reduces the coding robustness by one level while maintaining the same frequency, symbol rate and modulation scheme, and after using up all coding options on the given modulation scheme,
8 e) increases the modulation scheme by one level while maintaining the same frequency and symbol rate; and f) repeats steps d) and e) until the radio broadcast is successfully tuned.
According to an alternative preferred embodiment of this method according to the invention, the receiver is before a planned change informed of the future setting of the modulation scheme and modulator coding by means of additional signaling specific to the given communication standard, preferably in service tables SI or in program-specific tables PSI.
Further aspect of this invention is a system of devices for performing the method according to the present invention, comprising of multilayer central controller, broadcast services center, or also transmitter, modulator, encapsulator, receivers, viewership meter, weather measurement and forecasting system, customer technical support center, wherein the multilayer central controller for receiving data, their evaluation and control, on one hand receives information from one or more of the following data sources, such as receivers for receiving and measuring radio signal strength, viewership meters for measuring program audiences, weather measurement and forecasting system, customer technical support centers which evaluates and on the other hand manages the broadcast service center for compressing audio video programs and multiplexing services into a transport stream, or an encapsulator for encapsulating packets in a second layer transport stream, or a modulator for modulating the signal or also a transmitter for transmitting the radio signal.
According to another preferred embodiment, the system according to the invention comprises of a receiver and a viewership meter which are combined into a single device for transmitting data about the level of the received radio broadcast signal, as well as about the currently watched television program, to the multilayer central controller.
In particular, another aspect of this invention is a system of devices for performing a method of controlling the transmission and reception of broadcast or multicast telecommunications radio services comprising a multilayer central controller
9 connected via separate control channels to a broadcast services center, modulator, transmitter, at least one receiver, and at least one source of information of current transmission conditions, wherein the broadcast services center is communicatively connected with the modulator in order to transmit the transport stream to the modulator, and wherein the modulator is communicatively connected with the transmitter in order to transmit the modulated signal to the transmitter.
Preferably, the receiver is also a source of information about the current transmission conditions.
The source of information about the current transmission conditions can be, for example, the viewership meter, the weather measurement and forecasting system, or the customer technical support center.
The receiver and the viewership meter are preferably combined into a single device for sending data about the level of the received radio broadcast signal as well as about the currently watched television program to the multilayer central controller.
According to a preferred embodiment, an encapsulator is located between the broadcast services center and the modulator, connected via the control channel of encapsulator to the multilayer central controller. The communication link between the encapsulator and the modulator is preferably bidirectional.
Control channels can be one-way or two-way channels. The control channel of the transmitter, the control channel of the modulator, the control channel of the broadcast services center and the control channel of the encapsulator are bidirectional channels and the control channel of the receiver, the control channel of the viewership meter, the control channel of the weather measurement and forecasting system and the control channel of the customer technical support center can be one-way or two-way channels.
The bitrate of the transport stream can be changed by adding or excluding certain services from the broadcast services center with concurrent modification of SI/PSI tables, and/or by changing the audio and video compression level settings of
10 individual services, and/or by changing the priority of a certain service in case of statistical multiplex.
Brief Description of Drawings
Figure 1 shows a system for transmitting and receiving broadcast and multicast services with multilayer adaptation according to the invention.
Figure 2 shows a system for transmitting and receiving broadcast and multicast services with multilayer adaptation according to the invention with indirect control of the modulator settings via the encapsulator.
Figure 3 shows the dependence of the transport stream bitrate on the weather Figure 4 shows an example of changes in signal attenuation during the day depending on the weather conditions.
Figure 5 shows the adaptive selection of services with dependence on bitrate, modulation, coding, which depends on signal attenuation (weather), with priority of live services and services with higher viewership in the case of statistical multiplex. Figure 6 shows a flow chart of the principle of operation of the system according to the invention.
Figure 7 shows a flow chart of the principle of autonomous operation of the receiver in the event of loss of radio reception.
Description of Embodiments
Example 1
The system for transmitting and receiving broadcast and multicast services with multilayer adaptation, as illustrated in Figure 1, comprises the multilayer central controller 10, which receives information about the transmission conditions from receivers 4, the viewership meters 5 and the weather measurement and forecasting system 6. On the basis of this input information, the multilayer central controller 10 sets the parameters of the radio signal LI of the transmitter 1, in particular the radiated power (EIRP), as well as the modulated signal L2 of the modulator 2 via the control channel Cl of the transmitter, in particular modulation and coding. It sets
11 them so that the system ensures successful reception of the radio signal LI by as many as possible, or by all receivers 4, in given weather conditions (i.e., given signal attenuation), while achieving the highest possible spectral efficiency, measured in bit/Hz. In order to ensure the reliability of the system, the multilayer central controller 10 sets the strength of the radio signal LI with a predefined safety reserve, e.g., value of 2 dB. It subtracts this safety reserve from the minimum required signal strength for a given attenuation. If the weather conditions are very bad, such as a signal-to-noise ratio (C/N) of 3.5 dB, it does not set the modulation and coding of the modulator 2 to values corresponding to C/N of 3.5 dB, which would correspond to 4PSK modulation and 2/3 coding, but will instead set values corresponding to signal-to-noise ratio of 1.5 dB (3.5dB - 2.0dB = 1,5 dB), which according to the DVB-S2 standard EN 302 307 corresponds to 4PSK modulation and 1/2 coding, as shown in Figure 3 - Dependence of bitrate on weather in the DVB-S2 standard for commonly supported modulations 4 and 8 PSK in end-user satellite receivers 4.
If the multilayer central controller 10 can also adjust the radiated power (EIRP) of the transmitter 1, it can also achieve part of the signal amplification by increasing its radiated power. For example, if transmitter 1 increases the radiated power by 0.5 dB, it will not be necessary to apply a reserve of 2 dB, but only a reserve of 1.5 dB, so it will set the modulation and coding for C/N = 2 dB (3.5dB - 2dB + 0.5dB = 2 dB).
At the same time, the multilayer central controller 10 sets the highest possible transport stream L3 bitrate of the broadcast service center 3, corresponding to the settings of the transmitter 1 and the modulator 2, for example the statistical multiplex transport stream L3 bitrate. Based on the magnitude of the change in the bitrate of the transport stream L3, it proceeds to either add or remove individual services from the multiplex in the transport stream L3 while modifying the metadata in the transport stream L3, e.g. SI/PSI tables for DVB systems, or just to change the audio and video compression level settings of individual services, or priorities within the statistical multiplex of the transport stream L3, or all at once.
The multilayer central controller 10 prioritizes live broadcasting services and services with higher viewership, which it detects either online in real time or statistically over a longer period, with viewership meters 5. Viewership meter 5s, or so-called people
12 meters, detect viewership based on human ear inaudible audio tracks specific to various TV services. This measurement principle is the basis for objective audience assessment for advertising companies as well. The solution is shown in Figure 1 "Broadcasting with Multilayer Adaptation Services".
Example 2
It is similar to Example 1, with the difference that the multilayer central controller 10 does not control the modulator 2 directly, but via the encapsulator 8, specifically via the control channel C8 of the encapsulator, as illustrated in Figure 2. In the case of DVB-S2 satellite broadcasting, the encapsulator 8 inserts MPEG TS (transport stream) packets into BBF (baseband frame) frames, which contain modulation and coding settings in the header section.
Example 3
Is similar to Example 1 and Example 2, except that the receiver 4, in case of loss of the radio signal LI, tries to tune by changing the modulation and coding while maintaining the frequency and symbol rate according to the situation.
If the radio signal LI is weak, it can be assumed that the loss was due to worsening weather conditions. Then the receiver 4 starts switching the coding settings to the nearest coding values. For example, with the DVB-S2 standard and 8PSK modulation, it changes the coding from 9/10 to 8/9. If the receiver manages to tune the radio signal, it will remain tuned until the next signal is lost. If it fails to tune, the receiver 4 changes the coding by another step from 8/9 to 5/6. If it fails to tune again, it changes the coding setting further to 3/4, then 2/3. If the radio signal reception cannot be tuned in even then, it will also change the modulation from 8PSK to 4PSK (QPSK) with coding 4/5, 2/3 or 1/2.
In case the radio signal LI is strong and the signal was lost, it can be assumed that the signal was lost by intentionally adjusting the modulation and coding of the modulator 2 to values allowing a higher bitrate (i.e., spectral efficiency). The reaction of the receiver 4 will be similar in this case, but it will be realized in the opposite direction. In this case, the receiver 4 switches the coding settings while maintaining the same symbol rate to the nearest coding values and later also to the modulations
13 corresponding to one step less resistant signal (i.e., with a higher bitrate) in subsequent steps, until the signal is successfully tuned.
The evaluation of whether the signal is weak or strong before the loss of the signal, and thus whether to try to tune the stronger or weaker signal, can be determined by comparing the values of the signal strength from the values of C/N (i.e., SNR) for a certain period of time. If, for example, the weighted average of the values for the last 5-10 minutes decreased, it follows that the outage was caused by worsening weather and the receiver will gradually look for a stronger signal (with a lower bitrate).
For the receiver 4, an alternative indication of weather degradation is a comparison of the signal strength of the last measured C/N or SNR value with the table values of the minimum signal strength for a given combination of modulation and coding. If the difference is close to the minimum value, it corresponds to worsening of weather conditions. If the table value for a given modulation and coding is 11 dB, the set limit 2dB, and the last measured value was 12.3 dB, then we will consider this as a loss of signal due to bad weather conditions.
However, if on the other hand the weighted average of radio signal LI strength increases, it follows that the signal failure was due to improved weather conditions and system efforts to reduce signal strength and coding or increase modulation while increasing the bitrate of the transport stream L3 to increase spectral efficiency.
If the last measured value is more than 13 dB, for example 13.6 dB, at a minimum value of 11 dB, so that the difference between the set value 2dB is greater than 0 dB, it will logically change the setting in order to achieve a higher bitrate on the transmitting side.
Example 4
It is similar to Example 1, except that the multilayer central controller 10 prioritizes live broadcasts and services with bigger audience detected by the viewership meter 5, either online or statistically over time, when deciding on the inclusion and quality of individual services, pre-recorded services or time-shifted services.
Example 5
14 It is similar to Example 1, except that the multilayer central controller 10 detects radio signal LI attenuation for several selected locations of receivers 4 based on the weather measurement and forecasting system 6, from which it calculates signal attenuation in given directions for selected locations of receiver 4 based on the direction of the transmitted radio signal LI. The direction of signal propagation is calculated for the direction between a particular geostationary satellite and receiver 4 or also between terrestrial transmitter 2 and receiver 4.
Example 6
It is similar to Example 1, except that the broadcast radio signal LI is transmitted sequentially or in parallel by satellite, terrestrial, mobile or other wireless networks, whereas the radio signal LI can be transmitted by several radio networks, for example by satellite sequentially or in parallel by terrestrial transmitters. One example is the transmission of a signal by satellite transmission to terrestrial broadcast transmitters, from where it transmits terrestrially. Simultaneous transmission of satellite and terrestrial signals allows e.g., DVB standard "Single Illumination". In these situations, the multilayer central controller 10 evaluates the signal attenuation in the multiple transmission networks.
Example 7
It is similar to Example 1, except that the multilayer central controller 10 determines the parameter settings of the modulator 2 indirectly via the broadcast services center 3, based on the total bitrate of the transport stream L3, on the basis of which the modulator 2 selects the modulation and coding that corresponds or most closely exceeds the bitrate of the transport stream L3 of the broadcast services center 3.
Example 8
It is similar to Example 1, except that the multilayer central controller 10 detects the current attenuation of the radio signal LI by means of several receivers 4 connected by a return line to the multilayer central controller 10.
Example 9
15 It is similar to Example 1, except that it determines the current transmission parameters of the radio signal LI in a given area by means of the customer technical support center 7 by voice or in another form, for example by web reports.
Industrial Applicability
With this solution, it is possible to improve the transmission of broadcast and multicast services on various radio networks, such as satellite TV, terrestrial TV networks, mobile networks and wi-fi multicast networks. Thanks to its adaptability, the invention makes it possible to increase the availability of basic services even during very bad weather conditions, in cases when otherwise the reception of all services would fail, and on the other hand to increase the quality and number of services in good weather conditions, when there is low signal attenuation.
16 List of reference numbers:
1 transmitter
2 modulator
3 broadcast services center
4 receiver
5 viewership meter
6 weather measurement and forecasting system
7 customer technical support center
8 encapsulator
10 multilayer central controller
Cl control channel of transmitter
C2 control channel of modulator
C3 control channel of broadcast services center
C4 control channel of receiver
C5 control channel of viewership meter
C6 control channel of weather measurement and forecasting system
C7 control channel of customer technical support center
C8 control channel of encapsulator
LI radio signal
L2 modulated signal
L3 transport stream
L8 transport stream of the second layer
17

Claims

Claims
1. A method of controlling the transmission and reception of broadcast or multicast telecommunication radio services, c h a r a c t e r i z e d i n t h a t , the multilayer central controller (10) receives information about the current signal transmission conditions from various sources such as receivers (4) and/or viewership meters (5) and/or weather measurement and forecasting system (6) and/or customer technical support centers (7), and statistically evaluates them, wherein:
- if the transmission conditions deteriorate below the critical level, given by the sum of the minimum required signal-to-noise ratio value for the signal reception and the safety reserve, the multilayer central controller (10) reduces the signal-to-noise ratio value by reducing the modulation scheme and/or increasing the coding robustness of the modulated signal (L2) of the modulator (2) to predefined values, directly via the control channel (C2) of the modulator, or via the encapsulator (8) via a control channel (C8) of the encapsulator and accordingly reduces the output bitrate of the transport stream (L3) of the broadcast services center (3) to match the setting of the modulator (2), and/or increase the power of the radiated radio signal (LI) of the transmitter (1) through the control channel (Cl) of the transmitter; and
- when the transmission conditions improve above the critical level, the multilayer central controller (10) increases the signal-to-noise ratio value to a predefined value by increasing the modulation scheme and/or decreasing the coding robustness of the modulated signal (L2) of the modulator (2), directly through the control channel (C2) of the modulator, or via the encapsulator (8) via a control channel (C8) of the encapsulator and accordingly increases the output bitrate of the transport stream (L3) of the broadcast services center (3) to match the modulator (2) setting and/or decreases the radio signal (LI) power of the transmitter (1) via the control channel (Cl) of the transmitter; to ensure successful reception of the radio signal (LI) for as many receivers (4) as possible, with the highest possible spectral efficiency.
2. The method of controlling the transmission and reception of broadcast or multicast telecommunication radio services according to claim 1, c h a r a c t e r i z e d i n t h a t , the bitrate of the transport stream (L3) is varied by:
18 - adding or excluding certain services from the transmission of the broadcast services center (3) while modifying the SI/PSI tables, and/or
- changing the audio and video compression level settings of each service, and/or,
- by changing the priority of a particular service in the case of a statistical multiplex.
3. The method of controlling the transmission and reception of broadcast or multicast telecommunication radio services according to claim 1 or 2, cha racterized i n t h a t , the multilayer central controller (10) favors live broadcasts, and/or services with higher viewership, detected either online or statistically over a longer period by viewership meters (5).
4. The method for controlling the transmission and reception of broadcast or multicast telecommunication radio services according to claim 1, 2 or 3, cha racteri zed i n that, the weather measurement and forecasting system (6) calculates transmission conditions by recalculating radar meteorological measurements for determined transmission directions of the radio signal (LI).
5. The method of controlling the transmission and reception of broadcast or multicast telecommunications radio services according to any one of the preceding claims, cha racteri zed i n that, the radio signal (LI) is transmitted sequentially or simultaneously by satellite, terrestrial, mobile or other wireless networks, wherein the radio signal (LI) can be transmitted by several radio networks, for example by satellite, sequentially or also simultaneously by terrestrial transmitters, wherein the multilayer central controller (10) evaluates the transmission conditions of the radio signal (LI) in two or more networks.
6. The method of controlling the transmission and reception of broadcast or multicast telecommunication radio services according to any one of the preceding claims, cha racteri zed i n that, the multilayer central controller (10) determines the modulation scheme and/or coding settings of the modulator (2) indirectly via the broadcast services center (3), either on the basis of signalling embedded in the transport stream (L3) or on the basis of the total bitrate of the transport stream (L2) of the second layer - BBF (base band frame), on the basis of
19 which the modulator (2) selects such transmission parameters, in particular modulation and coding, which corresponds to or most closely exceeds the bitrate of the transport stream (L2) of the broadcast services center (3) and aligns it with zero packets.
7. The method for controlling the transmission and reception of broadcast or multicast telecommunications radio services according to any one of the preceding claims, c h a r a c t e r i z e d i n t h a t , the current transmission conditions of radio signal (LI) in a given territory are ascertained by the customer technical support center (7) by voice or other means, such as web reports.
8. The method of controlling the transmission and reception of broadcast or multicast telecommunications radio services according to any one of the preceding claims, c h a r a c t e r i z e d i n t h a t :
- a receiver (4) in case of loss of reception of radio signal (LI) due to gradual deterioration of reception of radio signal (LI): a) increases the coding robustness step by step, one level at the time, while maintaining the same frequency, symbol rate and modulation scheme, and after exhausting all the coding possibilities on the given modulation scheme, b) reduces the modulation scheme by one level while maintaining the same frequency and symbol rate; and c) repeats steps a) and b) until the radio signal (LI) is successfully tuned in, and
- a receiver (4) in case of loss of reception radio signal (LI) in a situation of gradual improvement of the reception of the radio signal (LI) due to a change in the modulation scheme and/or coding setting on the modulator (2) side: d) reduces the coding robustness step by step, one level at the time, while maintaining the same frequency, symbol rate and modulation scheme, and after exhausting all the coding possibilities on the given modulation scheme, e) increases the modulation scheme by one level while maintaining the same frequency and symbol rate; and f) repeats steps d) and e) until the radio signal (LI) is successfully tuned in.
20
9. The method of controlling the transmission and reception of broadcast or multicast telecommunication radio services according to any one of claims 1 to 7, cha racteri zed i n that, the receiver (4) is before a planned change informed of the future setting of the modulation scheme and modulator coding by means of additional signaling specific to the given communication standard, preferably in service tables SI or in program-specific tables PSI.
10. A system of devices for performing a control method according to any one of the preceding claims, cha racteri zed i n that, it comprises the central multilayer controller (10) connected via separate control channels to the broadcast service center (3), the modulator (2), the transmitter (1), at least one receiver (4), and at least one source of information about the current transmission conditions, wherein the broadcast services center (3) is communicatively connected with modulator (2) for transmitting the transport stream (L3) to the modulator (2), and wherein the modulator (2) is communicatively connected with the transmitter (1) for transmitting the modulated signal (L2) to the transmitter (1).
11. The system according to claim 10, cha racterized i n that, the receiver (4) is also a source of information about the current transmission conditions.
12. The system according to claim 10 or 11, cha racteri zed i n that, the source of information about the current transmission conditions is the viewership meter (5) and/or a weather measurement and forecasting system (6) and/or a customer technical support center (7).
13. The system according to any one of claims 10 to 12, cha racteri zed i n that, the receiver (4) and the viewership meter (5) are connected into a single device for transmitting data about the level of received radio signal (LI) as well as about the currently watched television program to the multilayer central controller (10).
21
14. The system according to any one of claims 10 to 13, cha racteri zed i n t h a t , the encapsulator (8) is arranged between the broadcast services center (3) and the modulator (2) and is connected via a control channel (C8) of the encapsulator to the multilayer central controller (10).
15. The system according to any one of claims 10 to 14, cha racteri zed i n t h a t , the control channel (Cl) of the transmitter, the control channel (C2) of the modulator, the control channel (C3) of the broadcast service center and the control channel (C8) of the encapsulator are the two-way channels and the control channel (C4) of the receiver, the control channel (C5) of the viewership meter, the control channel (C6) of the weather measurement and forecasting system and the control channel (C7) of the customer technical support center are one-way or two-way channels.
22
PCT/SK2022/050006 2021-05-12 2022-05-11 A method of controlling the transmission and reception of broadcast or multicast telecommunications radio services and a system of devices for performing this method WO2022240366A1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9485010B1 (en) * 2001-09-10 2016-11-01 The Directv Group, Inc. Adaptive coding and modulation for spot beam satellite broadcast

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9485010B1 (en) * 2001-09-10 2016-11-01 The Directv Group, Inc. Adaptive coding and modulation for spot beam satellite broadcast

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Digital Video Broadcasting (DVB); Implementation guidelines for the second generation system for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications; Part 1: DVB-S2", TECHNICAL REPORT, EUROPEAN TELECOMMUNICATIONS STANDARDS INSTITUTE (ETSI), 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS ; FRANCE, vol. BROADCAS, no. V1.2.1, 1 November 2015 (2015-11-01), XP014265553 *

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