CN101147398A

CN101147398A - Method and apparatus for determining transmitter identification information in terrestrial digital multimedia broadcasting system

Info

Publication number: CN101147398A
Application number: CNA2006800096968A
Authority: CN
Inventors: 郑硕镇; 李庆河; 李敬恩
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2005-03-25
Filing date: 2006-03-27
Publication date: 2008-03-19
Also published as: JP2008536376A; KR20060103176A

Abstract

An apparatus and method are provided for determining transmitter identification information (TII) in terrestrial digital multimedia broadcasting (T-DMB) system. The TII is detected by determining whether the TII occurs during the slot for a null symbol. The detected TII is stored into a TII database preferably continuously until a point of time for a TII update, and a TII detection result is output at the point of time for the TII update.

Description

In terrestrial digital multimedia broadcasting system, determine the method and apparatus of transmitter identification information

Technical field

The present invention relates generally to a kind of method and apparatus of in the terrestrial digital multimedia broadcasting system of packet radio is provided, determining transmitter identification information.More specifically, the present invention relates to a kind ofly when in terrestrial digital multimedia broadcasting (calling T-DMB in the following text) service, sending set conversion transmitters identification information (calling TII in the following text) and sending information then, improve the method and apparatus of the detectability of TII.

Background technology

Recently, along with the T-DMB service item comes into effect, the technical problem of following that needs solve has appearred.Such problem is the difference between relevant radio network and the junction network, particularly has only when guaranteeing the quality of TII signal receiver carrier wave can realize service.Just, the TII that is positioned in the above-mentioned synchronizing channel is the core part of T-DMB, and it is as the signal of the following function of operation.It classifies each transmitter by original synchronizing channel transmission and at Single Frequency Network (SFN) at T-DMB TII quilt.

Correspondingly, following plan is proposed.The TII signal that is used as sender unit identification in the T-DMB network identification system is used to distinguish radio network and junction network.

This TII is divided into radio network and junction network.Just, in order to distinguish radio network and junction network, need the dynamic change of TI I signal by making up junction network in the gap that does not obtain the radio network covering.As mentioned above, owing to the purpose for dynamic change when sending, these signals are not specified originally, so do not handle transmit operation TII signal such as the protection of the chnnel coding that is used for the senior quality of reception.

Correspondingly, though in the multichannel environment of the quality of reception with wireless universal environment difference on data-signal generating unit branch mistake because the described receiver of processing of the described chnnel coding of transmitter processes also can the restore data signal.

But described transmitter also is indifferent to required TII signal so that this signal of descrambling, so receiver restore data signal correctly.This problem has reduced the whole receptivity of receiver.

Correspondingly, need a kind of in terrestrial digital multimedia broadcasting (T-DMB) system effectively and determine the system and method for transmitter identification information economically.

Summary of the invention

Therefore, the purpose of the embodiment of the invention is to solve above-mentioned basically and other problems, and a kind of method and system that is used to strengthen the TII input ability with error detection and error correction coding in terrestrial digital multimedia broadcasting (T-DMB) system is provided.

Above-mentioned and other aspects of the embodiment of the invention can determine that by providing a kind of the method for transmitter identification information (TII) realizes in terrestrial digital multimedia broadcasting (T-DMB) system basically, this method comprises the steps promptly to detect TII by determine whether to take place TII during the time slot of null symbol, the TII that preferred storage continuously detects in the TII database till the time point that TII upgrades, the time point output TII testing result of upgrading at TII.

Above-mentioned and other aspects of the embodiment of the invention can also determine that in terrestrial digital multimedia broadcasting (T-DMB) system the method for transmitter identification information (TII) realizes by providing a kind of, this method comprises the steps to be the value that initialization detects the count pick up device, by determine that whether TII takes place is detected TII during the time slot of null symbol, the TII that preferred storage continuously detects in the TII database till the time point that TII upgrades, except the situation of the time point that is used for the TII renewal, increasing the value that detects the count pick up device, the value that determines whether to detect the count pick up device is the quantity of repetition, and the time point output TII testing result of upgrading at TII.

Above-mentioned and other aspects of the embodiment of the invention can also determine that in terrestrial digital multimedia broadcasting (T-DMB) system the transmitting system of transmitter identification information (TII) realizes by providing a kind of, this system comprises the cipher key center of storage public interleaving frame (CIF) Counter Value, the fast information channel in dab receiver (FIC) that the CIF counter lastest imformation that provides from described cipher key center is provided when TII is updated in predetermined territory, the main service channel (MSC) that comprises broadcast data, by the flow-generator of multiplexed FIC and MSC generation frame, and the transmitter that sends multiplexed frame.

Above-mentioned and other aspects of the embodiment of the invention can also be by providing a kind of receiver realization of determining transmitter identification information (TII) in terrestrial digital multimedia broadcasting (T-DMB) system, this receiver comprises radio frequency (RF) piece, broadcast data (BD) piece of the synchronizing channel (SC) of decoding from the broadcast data that the RF piece is provided, by utilizing null symbol to use TII that provides from the RF piece and public interleaving frame (CIF) counter that provides from the BD piece to detect the detector of TII, and fast information channel in dab receiver (FIC) decoder of the FIC of decoding from the broadcast data that the BD piece is provided.Network identification system (NIS) decoder by right verification message (ECM) marked network that uses TII and provide from the FIC decoder also is provided this receiver, the descrambler of broadcast data that descrambling is provided from the BD piece and the network identification information (NII) that provided from the NIS decoder, and the broadcast data decoder of the main service channel (MSC) of the broadcast data that provides from described descrambler of decoding.

Description of drawings

According to the detailed description below in conjunction with accompanying drawing, above-mentioned and other aspects and the advantage of the embodiment of the invention will become easier to understand, and wherein similar Reference numeral will be understood as that and refer to similar part, assembly and structure, wherein:

Fig. 1 is the block diagram of the general T-DMB transmitting system of diagram;

Fig. 2 diagram is according to the structure of the schematic T-DMB transmit frame of the embodiment of the invention;

Fig. 3 diagram can be used for expanding the exemplary data form of 8 location, FIG type 0 territory CIF value according to embodiments of the invention;

Fig. 4 is the block diagram of diagram according to the schematic T-DMB transmitting system structure of the embodiment of the invention;

Fig. 5 is the block diagram of diagram according to the schematic T-DMB receiver structure of the embodiment of the invention;

Fig. 6 is diagram is used to detect the exemplary process of TII in the T-DMB receiver according to the first embodiment of the present invention a flow chart; And

Fig. 7 is the flow chart that illustrates the exemplary process that is used to detect TII according to a second embodiment of the present invention in the T-DMB receiver.

In whole accompanying drawing, similar Reference numeral will be understood as that and refer to similar part, assembly and structure.

Embodiment

Hereinafter will describe some illustrative examples of the present invention with reference to the accompanying drawings in detail.In the following description, the detailed description of knowing to those skilled in the art for clarity and brevity that comprises function and structure here will be omitted.

Embodiments of the invention are usually directed to utilize receiver to be provided for the notice of the time point that TII upgrades so that strengthen the method for TII signal testing power.In this method, embodiments of the invention can be by showing the time point that TII upgrades from cipher key center, be updated periodically TII every a specified point, upgrade, will be added to fast information channel in dab receiver (FIC) corresponding to the value of the CIF counter of this configuration then at any point.Just, preferably embodiments of the invention provide a kind of receiver that utilizes to upgrade the method that the time point notice is provided for the TII from transmitting system.

First illustrative examples comprises the method for the time point that is fixed for the TII renewal.Can use the CIF counter in standard point.The CIF counter is assigned to each CIF, and digital audio broadcasting (DAB) logical frame (wherein as 13 bits (high-order 5 bits+low level 8 bits), 1 frame is made of 4 CIF, CIF can be made of maximum 64 subchannels by 24ms, as in the situation of Korea S T-DMB broadcast mode 1) Counter Value.The value of CIF counter change between 0～5000 (particularly high order bit between 0～19, and low-order bit is between 0～249).If TII is updated periodically, described receiver can be provided for the notice of the time point of TII renewal by monitoring CIF counter.

And, TII can not be upgraded at the time point that is used for the TII renewal, but, receiving ability can be improved by the repetition of using same signal owing to TII during this time cycle will can not be changed.

Second embodiment is included in the time point that is used for the TII renewal and utilizes receiver that the method for CIF Counter Value notice is provided.Scrambling is made of sub-channel unit, and the notice that is used for the time point of TII renewal can provide by the CIF Counter Value that uses subchannel.The notice of CIF Counter Value can be provided by the reservation of using one of them fast information channel in dab receiver that proposes in European standard, and this standard is entitled as " RadioBroadca sting Systems; Digita Audio Broadcasting (DAB) to Mobile, Portable and Fixed Receiver s "; ETSI EN 300 401 V1.3.3 (2001-05); European Telecommunication Standard committee calendar year 2001 and European Broadcasting Union publish calendar year 2001, and its disclosed full content is comprised incorporated by reference at this.Here, the example of available data format is as being used to expand the reservation in 8 type 0 territory illustrated in Fig. 3.

Second illustrative examples can also be similar to first illustrative examples and improve receiving ability.Identical data always can be sent out till updating message arrives, so, the chnnel coding type that second embodiment can correct a mistake by the repeated use of signal.

Fig. 1 is the block diagram of the general T-DMB transmitting system of diagram.

With reference to figure 1, general T-DMB transmitting system comprises cipher key center 100, mpeg 2 transport stream (MPEG2-TS) encoder 110, scrambler 120, public interleaving frame (CIF) 130, main service channel (MSC) 140, fast information channel in dab receiver (FIC) 150, set (ensemble) coffret flow-generator (calling flow-generator in the following text) 180 and transmitter 190.

Broadcast data by MPEG2-TS encoder 110 codings is carried out scrambling by the control word (CW) that produces in cipher key center 100.MSC140 by as the data of the scrambling that provides from CIF130 constitute.And the right verification message (ECM) that provides from cipher key center 100 is provided FIC150.MSC and FIC are multiplexed in the transmit frame by flow-generator 180.This transmit frame is sent to receiver by transmitter 190 then.Just, described CW is sent to receiver as ECM by encryption.

Fig. 2 diagram is according to the structure of the schematic T-DMB transmit frame of the embodiment of the invention.

With reference to figure 2, the T-DMB transmit frame comprises synchronizing channel (SC) part 200 and 210, fast information channel in dab receiver (FIC) part 230 and main service channel (MSC) part 240.And SC part 200 and 210 comprises the time slot that is used for TII or null symbol 200 and is used for the time slot of phase reference symbol (PRS) 210.FIC part 230 comprises a plurality of FIBs (FIB), and this piece comprises a plurality of fast information group (FIG).MSC part 240 comprises a plurality of CIF.

Here, if in transmit frame, send TII, then in another transmit frame, do not send TII.Transmitting time is determined according to the sending mode such as digital audio broadcasting (DAB) scheme.

Fig. 3 diagram can be used for expanding the exemplary data form of 8 location, FIG type 0 territory CIF value according to embodiments of the invention.

With reference to figure 3, be used to expand 8 FIG type 0 territory and be data format by ETSI EN300401V1.3.3 (2001-05) standard definition of above-mentioned reference.Be used to expand 8 FIG type 0 territory and comprise a plurality of serviced component global definitions 300,310 and 330.In the serviced component global definition 300,310 and 300 each comprises Sid340, Ext. mark 345, Rfa350 and 375, SCId355 and L/S mark 360 and 380.

And, under the situation of short format, be used to expand 8 F IG type 0 territory and also comprise 1 bit MSC/FIC mark 365 and 6 bit SubChld/FIDCID370.Under the situation of long form, be used to expand 8 FIG type 0 territory and also comprise 3 bit Rfa385 and 12 bit Scid.The value of CIF counter can be placed on Rfa350 and 375 in assembly global definition 300,310 and 330.

Fig. 4 is the block diagram of diagram according to the schematic T-DMB transmitting system of the embodiment of the invention.

With reference to figure 4, add data path to data flow as illustrated general transmitting system in Fig. 1 according to the data flow of the transmitting system of the embodiment of the invention.Just, corresponding to first illustrative examples described above, add the data path 410 that is used for providing to cipher key center 100 CIF counter notice according to the structure of the embodiment of the invention from flow-generator 180.Corresponding to second embodiment described above, add the message pathway 400 that is used for providing to FIC150 CIF counter lastest imformation 420 notices according to the another kind of structure of the embodiment of the invention from cipher key center 100.

Detailed description according to the data flow of the embodiment of the invention can illustrate in the description of data stream of the general transmitting system of Fig. 1 by adding said structure.

And other functional blocks of cipher key center 100 and Fig. 4 can replace by any amount of suitable functional block such as controller.

Fig. 5 is the block diagram of diagram according to the T-DMB receiver schematic structure of the embodiment of the invention.

With reference to figure 5, this receiver comprises radio frequency (RF) piece 510, broadcast data (BD) piece 520, FIC decoder 530, NIS decoder 540, descrambler 545, DMB decoder 550 and TII detector 560.

Here, RF piece 510 receives the T-DMB radio frequency, the synchronizing channel of BD piece 520 decodings from the broadcast data that RF piece 510 provides.TII detector 560 uses TII that provides from RF510 and public interleaving frame (CIF) counter 570 that provides from BD piece 520 to detect TII by utilizing null symbol 565.

Fast information channel in dab receiver (FIC) decoder 530 FICs of decoding from the broadcast data that BD piece 520 provides, right verification message (ECM) 585 marked networks of network identification system (NIS) decoder 540 by using TII and providing from FIC decoder 530.

Broadcast data that descrambler 545 descramblings provide from BD piece 520 and the network identification information (NII) that provides from NIS decoder 540.And broadcast data decoder 550 is play visual media by the main service channel (MSC) of the broadcast data that decoding provides from descrambler 545.Here, preferably TII detector 560 also is provided to from the CIF of FIC decoder 530 counter lastest imformation.

Just, corresponding to first illustrative examples described above, add the data path 570 that is used for from BD piece 520 input CIF counters to T-DMB receiver inside according to the structure of the embodiment of the invention.Corresponding to second embodiment described above, add the message pathway 580 that is used for providing to TII detector 560 notice of CIF counter lastest imformation from FIC decoder 530 according to another structure of the embodiment of the invention.

And any functional block of Fig. 5 can replace by any amount of suitable functional block such as controller.

Fig. 6 is diagram is used for detecting at the T-DMB receiver exemplary process of TII according to above description first an illustrative examples of the present invention flow chart.

With reference to figure 6, in step 610, described receiver passes through to use the null symbol synchronization frame of synchronous duration, and determines whether TII takes place during the time slot of null symbol.In step 620, this receiver carries out demodulation, and whether the TII signal is utilized null symbol is received to detect.

In

step

630 and 640, the TII of demodulation preferably is stored in the TII database continuously till the value that detects " public interleaving frame (CIF) counter-1 ".

In step 650, described receiver determines whether that the value of public interleaving frame (CIF) counter is the predetermined target value of " CIF counter-1 ".In step 660, when reaching the value of " public interleaving frame (CIF) counter-1 ", receiver output TII testing result.Here by TII examining report strategy, only export the value of described testing result, perhaps export its maximum frequency values as the detected TII that is associated with accumulation or the mean value of detected TII as detected TII.

In step 670, receiver determines whether that detection stops the TII testing process according to TII.

Here, being used to the exemplary process of target CIF counter notice is provided is different for first illustrative examples with second illustrative examples.When first illustrative examples utilize specific CIF Counter Value fixedly TI I upgrade time point the time, transmitting system has been known the value of CIF counter, and the value of the notified target CIF counter of receiver.

And when second embodiment provided the notice of TII point update time via fast information group (FIG), transmitting system provided the receiver that is notified to of TII point update time via FIGO territory expansion 8.So receiver can be in the value of notified target CIF counter after the FIG decoding.As previously discussed, in second illustrative examples, added the logical construction that the notice of target CIF Counter Value is provided to the TII detector.In following Fig. 7, be described in the action of receiver in this case.

Fig. 7 is the flow chart that diagram second illustrative examples according to the present invention is used for detecting at the T-DMB receiver exemplary process of TII.

With reference to figure 7, in step 710, the value of described receiver initialization detection repetition counter.In step 715, receiver determines whether TII takes place during the time slot of null symbol.In step 720, taking place during the time slot of null symbol under the situation of TII, receiver carries out demodulation with detection TII signal, and is not taking place to repeat this step under the situation of TII during the time slot of null symbol.

In

step

725 and 730, described receiver preferably continuously the TII that detects of storage in the TII database till preparing to upgrade the TII lastest imformation.

In step 735, described receiver determines whether whether TII exists, prepare to upgrade the TII lastest imformation.In step 740, described receiver is determined the pattern in TII existence and preparation renewal TII lastest imformation situation.If this pattern is to restart pattern, then receiver turns back to step 710.If this pattern is interim result's a use pattern, then receiver jumps to step 755.

In step 745, except that the situation of TII point update time, described receiver increases the value of detection repetition counter.

In step 750, described receiver determines that detection repetition counter is the number of repetition.If this detection repetition counter is the number of repetition, then in step 755, described receiver is exported the TII testing result.If detection repetition counter is not the quantity of repetition, this receiver turns back to step 715.

In step 760, described receiver determines whether that detection stops the ITT testing process according to TII.Do not detect if it does not stop TII, then this receiver turns back to step 710.

Can understand from above description, according to illustrative examples of the present invention, by the identical value of in the TII detector, using statistics or accumulation the TII detection probability can be set, because preceding value is held till the time point that the value of TII is upgraded by notice TII changes.

And, can understand from above description, according to illustrative examples of the present invention, if in receiver, detect TII then can optimize the ability of included hardware, because the TII detector is without any need for further operation.

Although for the purpose of example has been described some illustrative examples of the present invention, but those of ordinary skill in the art will be understood that under the condition that does not deviate from by the defined scope of the invention of following claim and equivalent four corner thereof, can carry out various modifications, interpolation and replacement.

Claims

1. one kind is used for broadcasting the method that (T-DMB) system determines transmitter identification information (TII) at terrestrial digital multimedia, and this method may further comprise the steps:

Detecting TII during the time slot of null symbol takes place;

The TII that storage detects in the TII database till the time point that TII upgrades; With

Export the TII testing result at the time point that TII upgrades,

Wherein the time point of TII renewal comprises the time when the value of public interleaving frame (CIF) counter is predetermined target value.

2. method according to claim 1 is wherein exported the value of described testing result as detected TII.

3. method according to claim 1 is wherein exported the maximum frequency values of described testing result as the detected TII that is associated with accumulation or the mean value of detected TII.

4. one kind is used for broadcasting the method that (T-DMB) system determines transmitter identification information (TII) at terrestrial digital multimedia, and this method may further comprise the steps:

The value of initialization detection repetition counter;

During the time slot of null symbol, detect TII;

The TII that storage detects in the TII database till the time point that TII upgrades;

Except that the situation of TII point update time, increase the value of detection repetition counter, and determine whether that described detection repetition counter is a predetermined target value; With

Export the TII testing result at the time point that TII upgrades,

Wherein send the information that comprises TII point update time via predetermined territory.

5. method according to claim 4 also is included in the step of the time point deterministic model that TII upgrades.

6. method according to claim 5, wherein said pattern comprise the pattern of restarting that turns back to initialization step, perhaps jump to the interim result's of output step use pattern.

7. method according to claim 4, wherein said predetermined domain are to be used to expand 8 fast information group (FIG) type 0 territory.

8. method according to claim 4 is wherein exported the value of described testing result as detected TII.

9. method according to claim 4 is wherein exported the maximum frequency values of described testing result as the detected TII that is associated with accumulation or the mean value of detected TII.

10. one kind is used for broadcasting the transmitting system that (T-DMB) system determines transmitter identification information (TII) at terrestrial digital multimedia, and this system comprises:

The cipher key center of storage public interleaving frame (CIF) Counter Value;

Comprise when TII is updated the fast information channel in dab receiver (FIC) from the CIF counter lastest imformation that cipher key center provided in predetermined territory;

The main service channel (MSC) that comprises broadcast data;

Produce the flow-generator of frame by multiplexed FIC and MSC; With

Send the transmitter of described multiplexed frame.

11. system according to claim 10, wherein said cipher key center are provided the value of CIF counter from flow-generator.

12. a receiver that is used for determining in terrestrial digital multimedia broadcasting (T-DMB) system transmitter identification information (TII), this receiver comprises:

Radio frequency (RF) piece;

Broadcast data (BD) piece of the synchronizing channel (SC) of decoding from the broadcast data that the RF piece is provided;

The detector of TII is provided by public interleaving frame (CIF) counter that uses null symbol and provide from the BD piece;

Fast information channel in dab receiver (FIC) decoder of the FIC of decoding from the broadcast data that the BD piece is provided;

Network identification system (NIS) decoder of right verification message (ECM) marked network that uses TII and provide from the FIC decoder;

The descrambler of broadcast data that descrambling is provided from the BD piece and the network identification information (NII) that provided from the NIS decoder; And

The broadcast data decoder of the main service channel (MSC) of the broadcast data that decoding provides from described descrambler,

Wherein said detector is provided CIF counter lastest imformation from the FIC decoder.