EP1943761A1 - Procede de transmission radio d'une pluralite d'offres d'informations differentes et dispositif d'emission et de reception destine a cet effet - Google Patents

Procede de transmission radio d'une pluralite d'offres d'informations differentes et dispositif d'emission et de reception destine a cet effet

Info

Publication number
EP1943761A1
EP1943761A1 EP05803487A EP05803487A EP1943761A1 EP 1943761 A1 EP1943761 A1 EP 1943761A1 EP 05803487 A EP05803487 A EP 05803487A EP 05803487 A EP05803487 A EP 05803487A EP 1943761 A1 EP1943761 A1 EP 1943761A1
Authority
EP
European Patent Office
Prior art keywords
time
transmission
local
information
broadcasting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05803487A
Other languages
German (de)
English (en)
Inventor
Gunther May
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technische Universitaet Braunschweig
Original Assignee
Technische Universitaet Braunschweig
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technische Universitaet Braunschweig filed Critical Technische Universitaet Braunschweig
Publication of EP1943761A1 publication Critical patent/EP1943761A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Definitions

  • the invention relates to a method for broadcasting of a plurality of different information offers in a terrestrial Gleichwellenrund- wireless network on a common channel with broadcast signals in the time slot method in which each information offer at least one transmission slot is allocated for broadcasting the information offer and a broadcast signal over time a plurality of global time windows each having at least one transmission slot and the broadcast signal is broadcast from a plurality of spatially spaced transmit devices such that the global time windows of the broadcast signals broadcast by the broadcast facilities include the same information offers and the allocation of the transmission slots of the global time slots to the information offers are identical.
  • the invention further relates to a transmitting device for broadcasting a plurality of different information offers in a common-rail terrestrial network on a common channel with transmission signals in the time slot method with such a radio transmission method, with a radio transmitting unit and a mixing unit for mixing information of different information offers in the broadcast signal.
  • the invention further relates to a receiving device for receiving broadcast signals transmitted after the broadcasting transmission method, the broadcasting signals each having a plurality of different information offers and each information offering being assigned at least one transmission time slot for broadcasting the information offer and a broadcast transmission signal having a plurality of global time slots over time having at least one transmission slot, and the global time slots of a plurality of spatially spaced apart transmitters concurrently broadcasting broadcast transmission signals contain the same information offers, and the allocation of the transmission slots of the global time slots identical to the information offers with a radio receiving unit and a decoding unit for decoding the received digital broadcasting signals.
  • multi-frequency networks Two different types of digital terrestrial broadcasting networks are known, namely multi-frequency networks and single-frequency networks.
  • the services offered are transmitted on different carrier frequencies or channels. This makes it possible that the transmitted services between the different channels are designed differently from each other.
  • Such services or information may be z. b. Television or radio program.
  • informational offers may also be traffic announcements, weather information or other specific information.
  • all transmitters within a region transmit identical identical services on one and the same carrier frequency or on the same channel. This means that the content of a broadcasts broadcast from a plurality of spatially spaced transmitters of a region in content and the transmitters are coupled in a frequency and phase locked.
  • the individual services can be broadcast in transmission time slots.
  • time intervals are provided, in each of which specific data packets for a specific service are transmitted.
  • the corresponding service is again assigned a new transmission time slot.
  • This method is known from the European standard ETSI EN 302 304 "Digital Video Broadcasting (DVB) - Transmission System for Handheld Terminal (DVB-H)."
  • the broadcast signals are transmitted in transport data stream streams coded according to the MPEG standard Data of an information offer is discontinuous, so that to reproduce an information offer A buffer for the received data of an information offer must be present in the receiver in order to enable a continuous reproduction.
  • the advantage of the transmission of data of an information offer in transmission time slots is that in order to reduce the energy consumption, in particular for portable receivers, the receiving unit can be switched off in the meantime between two successive transmission time slots of an information offer intended for reception.
  • DE 4424 778 C1 discloses a method in which a stereo transmission channel for radio transmission is divided into two mono transmission channels.
  • the mono transmission channels are only occupied by certain stations with a program. Therefore, it is possible to transmit two local broadcast programs in a single transmission channel. However, sending more than two services per channel is not possible.
  • DE 41 02 408 A1 a method for transmitter or regional detection in single-frequency networks is described, in which in addition to a radiated service in a single-frequency network a regional deviating additional carrier frequency is sent, with the help of local services can be offered. Disadvantageously, additional carrier frequencies are required to transmit the local service.
  • DE 4222 877 A1 describes a method for transmitting regionally different information in single-frequency networks, in which data are transmitted in time slots not occupied by a single-frequency signal. In contrast to the simulcast operation, however, these data are transmitted in frequency division multiplex on carrier frequencies different for each transmitter. Again, several carrier frequencies are disadvantageously required and one receiver has to switch from one carrier frequency to the other carrier frequency. For the transmission of local information offers the advantage of a single-frequency network is therefore not available.
  • the transport data streams are usually transmitted using an interleaving method in order to protect the data transmission from so-called burst errors.
  • the properties of the burst errors are exploited in that, if they occur, they destroy a larger number of contiguous bits, but are relatively rare. Due to the resorting of the data, the burst errors have an effect as single errors at individual points of the original data stream and are no longer associated.
  • the individual bit errors can then be corrected if the data to be transmitted is scrambled in the time sequence. Also through error protection methods (eg checksum method, convolution method) the data streams are temporally blurred.
  • error protection methods eg checksum method, convolution method
  • the object is achieved by the generic method according to the invention, in that the broadcast signals continue to have local time slots with transmission time slots assigned to the local information offerings, wherein broadcasting signals broadcast by at least two spatially spaced transmitters on the same channel with identical information offers in the global time slots in local Time windows have different information offers.
  • the global information offerings can be received in the same way as they would be in one region, while the local information offers in spatially limited broadcasting regions can be received individual transmitter are receivable.
  • the actual reception range of the individual transmission devices is indeed reduced for the reception of the local information services, since the overlapping areas of broadcast radio signals transmitted by the transmission facilities can not be used.
  • the subregions of the transmitters with local information offerings are still large enough to be able to use the method in practice.
  • the broadcast signals have at least one transition time interval in the transition between a global time window to a local time window and / or in the transition between a local time window to a global time window.
  • the transmission time intervals ensure a defined transition between the global and local time windows.
  • the transition interval is at least as long as the length of the time interval to which the radio transmission signal before the transition interval by interleaving - and / or error protection method affects, so that the broadcast signal after the transition interval is no longer affected. That is, re-sorting or scrambling occurs only within the global time slots and transition intervals and local time slots, thus allowing decoding of the broadcast signal, even if broadcast signals are broadcast by adjacent transmitters having different contents in the local time slots.
  • null packets of defined content are preferably transmitted that are not relevant to the transmitted information offers.
  • Such null packets are defined for example in the MPEG standard. The loss of such Data does not affect the receipt of global information offers in the event of interference from broadcast signals.
  • a variable assignment of the length of the time slots of global and / or local time windows and / or the length of the global and / or local time windows can be carried out in a manner known per se. This means that the transmission capacity can be adapted to the needs of the individual information providers and also an optimal capacity allocation between global and local information offers is possible.
  • the object of the invention is furthermore to provide an improved transmitting and receiving device, with which local information offers can be sent or received in the common wave network on a common carrier frequency.
  • the mixing unit is adapted to interfere local information offers in transmission time slots of local time window of the broadcast signal, wherein radiated by at least two spatially spaced transmit facilities broadcasting signals in local Zeitfens- tern from each other have different information offers.
  • the object is further achieved according to the invention with the receiving device of the type mentioned above in that the decoding unit is set up so that local information offers of the broadcasting signal are extracted from transmission time slots of local received radio transmission signals assigned to the local information offerings, wherein at least two spatially spaced transmitter devices broadcast on the same channel broadcasting signals in local time slot groups have different information offers from each other.
  • This uses the newly introduced local time windows for the transmission of local information offers in the common wave network on one and the same carrier frequency.
  • Figure 1 sketch of a common wave network in a receiving region with multiple transmitting devices
  • FIG. 2 shows a diagram of the data rate of a radio transmission signal in the time slot method over time, with a multiplicity of time slots for different information offers;
  • FIG. 3 shows a diagram of the time distribution of broadcasting transmission signals emitted by the neighboring transmission devices into global and local time windows
  • FIG. 4 shows a section of the temporal distribution of a broadcasting transmission signal from FIG. 3 with transition intervals before and after the local time windows.
  • FIG. 1 shows a sketch of a simulcast radio network 1 which has a plurality of transmitting devices 3a, 3b, 3c, 3d arranged distributed over a receiving region 2.
  • the transmitting devices 3 are coupled to each other in a frequency-locked and phase-locked manner so that a broadcasting signal identical in global time windows is radiated frequency-stable and phase-locked throughout the receiving region 2, ie the broadcasting signal is transmitted simultaneously by all transmitting devices 3 of the receiving region 2 on one and the same carrier frequency becomes.
  • the same broadcast signal can thus be received without changing the carrier frequency, without this being disturbed by interferences in overlapping regions of the transmission ranges of adjacent transmitting devices 3.
  • digital broadcasting signals as used in particular in the DVB-H multiplex transmission method, a superimposition of different broadcasting signals on the same carrier frequency lead to an overlapped broadcast signal, which would be completely unusable.
  • global and local time windows are defined, with the transmitting means 3 transmitting a reception region 2 within the global time windows and the same information.
  • the broadcasting signals radiated by the individual transmitting devices 3 are thus absolutely identical at least within the global time windows.
  • the global information offers that are broadcast within the global time windows can thus be received within the entire reception region.
  • local time windows are defined in the broadcast signals, within which the individual transmission devices 3a, 3b, 3c, 3d can emit different or the same information offers as needed.
  • the radio transmission signals can thus differ from one another within the local time windows.
  • the broadcast signal becomes unusable and the local services can not be received there.
  • the local service that is to say the local service, can also be used in the overlapping area of this transmitting device 3c, 3d. H. the local information service is received.
  • the receiving subregions 4a, 4b, 4c of the local services are outlined by the different hatching according to the different local services.
  • both global and local information offers can be received in the receiving regions 4. In the other receiving regions, however, only the global services can be received. Outside the receiving region 2, it is no longer possible to receive any service broadcast by the transmitting devices 3 of the receiving region 2.
  • the receiving subregions 4 of the local services are generally smaller in the present method than if they were transmitted by a single transmitting device 3 on a carrier frequency exclusively assigned to this transmitting device 3, as would be the case in a multi-frequency network. The reason for this is the interference with the broadcasting signals of other transmitting devices 3 which at the same time broadcast other contents on the same carrier frequency, only separated by the spatial distance. Simulation has shown that the receiver subregions 4, within which local services can be received, are still large enough to be able to use the method in practice.
  • FIG. 2 shows a diagram of the data rate of a broadcast signal over time, wherein the broadcast signal is divided into time slots.
  • a time slot is the periodic allocation of usage for a fixed or variable predetermined period of time.
  • Different information offers such as the services 1 to 5 are assigned to different time slots.
  • temporal intervals are provided, which are each assigned to data packets for a service and in which no other other services are transmitted.
  • a corresponding service is again assigned a new time slot.
  • the intervals between the time slots and the time duration of the time slots may vary and need not be constant in time. Accordingly, even some services may even be assigned more timeslots than others, as outlined in FIG.
  • the service 1 has twice as many time slots as the other services 2 to 5 and the order of the information offers is as follows:
  • FIG. 3 shows the division of a radio transmission signal according to the invention over time. It becomes clear that global time windows for global Information is provided within which the division of the time slots on the information offers, the intervals between the time slots and the length of the time slots of the broadcasting of different transmitting devices 3 broadcast signals a and b are absolutely identical. Furthermore, local time windows are provided, in which the broadcasting transmission signals a and b of different transmitting devices, which are broadcast on one and the same carrier frequency, can be different from one another.
  • a portion of the total data rate of the broadcast transmission signal is reserved for local services, which may have different information offers for different broadcast facilities.
  • the local services can thus be different from each other in different subregions of the terrestrial single-frequency network.
  • the local time windows are also divided into time slots. It is possible for individual transmitting devices 3 to emit their own local services and for several transmitting devices 3 to be combined to form local groups.
  • time slots of the individual information offers or services are not sharp and seamlessly separated from each other. This has technical reasons, since at first so-called interleaver and error detection or error correction mechanisms are present, which cause a "blurring" of the data occurs in the transition areas.
  • FIG. 4 which shows a section of a broadcasting transmission signal in the region of a local time window with time windows reserved for local information offers, shows transition intervals before and after the time intervals of the local time window, ie at the beginning and at the end of a local time window. These transition intervals ensure that the transition between the global time windows and the local time windows are safely separated. In the transition intervals, no relevant data, but "null packets" in the sense of the MPEG2 standard in the form of MPEG2 Transport stream null packets are sent whose loss in interference of broadcast signals does not affect the reception of global information offers. The transition intervals should be so large that, despite the interleaver blur and error detection or error correction mechanisms, data from local services never overlap with data from global services.
  • error detection or error correction methods With the help of error detection or error correction methods, errors in the transmission of information are detected and, if possible, corrected. These error detection and error correction methods are well known. In this case, an additional redundancy in the form of additional bits is inserted in principle before the transmission of the user data, which can be used on the receiver side for the determination of errors and error positions.
  • a bundle error is a
  • the bits of a data packet i. H. a
  • bit errors are not coherent as in the bundle error.
  • the transition intervals ensure that a time interval of the broadcast signal that interleaving and / or error protection methods do not affect the broadcast transmission signal outside of the time interval, not both global and local services. That is, at the receiver, the influence of the interleaving method can be canceled at any rate for the global time windows, too if in the local time windows different data are sent out by the individual transmitting devices 3 and due to interferences the data in the local time windows are disturbed or unusable.
  • transition intervals can be calculated as follows:
  • FEC Forward Error Correction
  • QPSK Quaternary Phase Shift Keying
  • QAM Quadrature Amplitude Modulation
  • the inner interleaver for the symbol-level interleaving method requires different sizes of the transition interval, depending on the mode (2k, 4k or 8k).
  • transition intervals of at least 39,564 bits are needed. Assuming a cycle time of 8 seconds between two successive time slots for local services, this corresponds to an occupancy of approximately 10 kbit / s.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention concerne un procédé de transmission radio d'une pluralité d'offres d'informations différentes dans un réseau radio terrestre sur fréquence commune, sur un canal commun, avec des signaux de transmission radio, selon le procédé des intervalles temporels. Au moins un intervalle temporel de transmission est affecté à chaque offre d'informations pour la transmission radio de l'offre d'informations, et un signal de transmission radio présente, dans le temps, une pluralité de fenêtres temporelles globales avec respectivement au moins un intervalle temporel de transmission. Le signal de transmission radio est émis par une pluralité de dispositifs d'émission (3) espacés, de telle manière que les fenêtres temporelles globales des signaux de transmission radio émis par les dispositifs d'émission contiennent les mêmes offres d'informations, et l'affectation des intervalles temporels de transmission des fenêtres temporelles globales est identique aux offres d'informations. Selon l'invention, les signaux de transmission radio présentent des fenêtres temporelles locales avec des intervalles temporels de transmission, affectés à des offres d'informations locales. Des signaux de transmission radio émis par au moins deux dispositifs espacés (3) sur le même canal, présentant des offres d'informations identiques dans des fenêtres temporelles globales, présentent des offres d'informations différentes dans des fenêtres temporelles locales.
EP05803487A 2005-11-01 2005-11-01 Procede de transmission radio d'une pluralite d'offres d'informations differentes et dispositif d'emission et de reception destine a cet effet Withdrawn EP1943761A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/011670 WO2007051478A1 (fr) 2005-11-01 2005-11-01 Procede de transmission radio d'une pluralite d'offres d'informations differentes et dispositif d'emission et de reception destine a cet effet

Publications (1)

Publication Number Publication Date
EP1943761A1 true EP1943761A1 (fr) 2008-07-16

Family

ID=35539519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05803487A Withdrawn EP1943761A1 (fr) 2005-11-01 2005-11-01 Procede de transmission radio d'une pluralite d'offres d'informations differentes et dispositif d'emission et de reception destine a cet effet

Country Status (3)

Country Link
US (1) US20090181612A1 (fr)
EP (1) EP1943761A1 (fr)
WO (1) WO2007051478A1 (fr)

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Publication number Priority date Publication date Assignee Title
KR101838071B1 (ko) * 2010-04-30 2018-03-13 엘지전자 주식회사 이미지 처리 방법 및 장치
US10412600B2 (en) * 2013-05-06 2019-09-10 Itron Networked Solutions, Inc. Leveraging diverse communication links to improve communication between network subregions

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
GB2287384B (en) * 1994-03-11 1998-09-02 British Broadcasting Corp Digital broadcast systems for local transmissions
US7362740B2 (en) * 2000-09-12 2008-04-22 Timegalactic Ab Arrangement with a number of units that can communicate with each other via a wireless connection system and a method for use with such a system
DE10114035A1 (de) * 2001-03-22 2002-12-12 Bosch Gmbh Robert Verfahren zum Versenden von digitalen Rundfunksignalen
DE10139069B4 (de) * 2001-08-09 2006-02-16 Rohde & Schwarz Gmbh & Co. Kg Verfahren und Anordnung zum regionalen Einblenden von Lokalprogrammen in einem DVB-Gleichwellennetz
US7289861B2 (en) * 2003-01-28 2007-10-30 Fisher-Rosemount Systems, Inc. Process control system with an embedded safety system
US7437140B2 (en) * 2005-01-21 2008-10-14 Sony Corporation Power line network bridge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007051478A1 *

Also Published As

Publication number Publication date
US20090181612A1 (en) 2009-07-16
WO2007051478A1 (fr) 2007-05-10

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