CN101431655B - Method for implementing zone control of digital television - Google Patents
Method for implementing zone control of digital television Download PDFInfo
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- CN101431655B CN101431655B CN2008103060615A CN200810306061A CN101431655B CN 101431655 B CN101431655 B CN 101431655B CN 2008103060615 A CN2008103060615 A CN 2008103060615A CN 200810306061 A CN200810306061 A CN 200810306061A CN 101431655 B CN101431655 B CN 101431655B
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Abstract
The invention relates to a method for realizing control to a digital TV region. The invention discloses the method for realizing control to the digital TV region which has little cost and occupies less system resource. The technical scheme is summed up in that: setting and changing an initiation state of an smart card issue region code; generating/changing the issue region code of each region; associating the issue region code and corresponding region smart card; generating update EMM data package of the smart card and sending; STB filtering the smart card state and updating EMM data package; analytically setting the smart card issue region code; initializing native region operating code; generating the operation region code description code; inserting the operating region code description signal into TS flow NIT; modulation outputting TS flow; analytically NIT and obtaining the operation region code description signal; analytically the operation region code description signal; comparing the region code and finishing the region control. The invention reduces use of the hardware equipment, reduces cost and occupies less system resource without needing NIT table distribution center.
Description
Technical field
The present invention relates to the digital TV Broadcasting Techniques field, relate to a kind of method that realizes digital TV region control specifically.
Background technology
Along with constantly carrying out of the whole conversion work of DTV; Digital television business is promoted the focus that has become the various places radio and TV operator, and digital television conditional access system (CAS) becomes the strong technical guarantee that operator realizes the operation of diversification digital television business.But because the level of economic development of various places and the level of consumption is different, marketing strategy and the price strategy taked also are not quite similar.Simultaneously, cable TV belongs to multistage network, maybe be not under the jurisdiction of each other between the networks at different levels, and independent operation, this just requires in the DTV operation, must carry out the multiple management system.In order to guarantee the regional uniqueness and the legitimacy of STB and smart card, prevent the roaming of machine card, and fundamentally ensure the operation interests of each department that operator must consider to adopt the Region control technology.
Region control can prevent that the user from taking STB and smart card outside the restricted area and use, realize the effective control of operator to different area under one's jurisdictions marketing strategy.The method of realization digital TV region control of the prior art mainly contains following two kinds:
Method one, utilize the mapping of NIT (network information table) PID to realize district management control; In this method; By the unified NIT table that produces to the different PID in each area of digital television conditional access system general headend (hereinafter to be referred as general headend); NIT has the area flag of CA (authentication center) definition, chooses local needed NIT table at each regional digital television conditional access system sub-headend (hereinafter to be referred as sub-headend) and shines upon, and filters out the NIT table irrelevant with this area.
Method two, realize district management control through the provincial characteristics code stream; In this method, produce characteristic code flow, and be sent to the agreement frequency through code stream transmission card to each regional sub-headend by the general headend unification; At each regional sub-headend; From the multifrequency point signal of input, filter out the characteristic code flow frequency, and other region code in the characteristic code flow flow through filter, only let one's respective area code stream output.When digital TV terminal is started shooting, the provincial characteristics code stream on the STB search agreement automatically frequency.
In the said method; Method one needs the each department sub-headend to use QAM (quadrature amplitude modulation) modulator that has the special processing function; And need general headend to have a NIT table distributing center to come for all regional sub-headend equipment generates different NIT table data, it is bigger to account for system resource; Need increase characteristic code flow at general headend in the method two and send card; And to distribute independent band resource for characteristic code flow; Each sub-headend need increase a qam demodulator, a QAM modulator and a band stop filter simultaneously, and is the independent band resource of characteristic code flow distribution of each sub-headend.The cost that these two kinds of Region control realize is all bigger.
Summary of the invention
Technical problem to be solved by this invention is: controlling cost to digital TV region of the prior art reaches the big deficiency of occupying system resources more greatly, proposes a kind of method that realizes the realization digital TV region control that cost is less and occupying system resources is little.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of method that realizes digital TV region control may further comprise the steps:
A. at the digital television conditional access system general headend; The distribution district sign indicating number is provided with administration module and generates the EMM packet that has distribution district, this area sign indicating number to the digital television conditional access system application according to distribution district sign indicating number and this area's STB terminal smart card information that operator provides; By digital television conditional access system the state renewal EMM of this EMM packet as the STB terminal smart card is multiplexed in the TS stream again; After STB terminal receives that this intelligent card state upgrades EMM; By region code parsing module is set and resolves this EMM packet, and the distribution district sign indicating number of smart card is set according to the region code that obtains;
B. at each sub-headend of digital television conditional access system, operation area sign indicating number insert module is through the operation area sign indicating number descriptor of QAM modulator ad-hoc location insertion respective regions in the NIT of TS stream table, in order to identify the zone that this TS stream can be allowed to play;
C. after STB receives TS stream; At first resolve the NIT table and obtain operation area sign indicating number descriptor; By region code parsing module parsing operation region code descriptor is set then and obtains the operation area sign indicating number; Have only when the operation area sign indicating number equals the distribution district sign indicating number in the smart card, the CA module in the STB terminal is just carried out filtration treatment to the CA table, thereby realizes Region control.
Said step a also comprises: the distribution district sign indicating number was provided with administration module before generating the EMM packet of band distribution district sign indicating number to the digital television conditional access system application; Generate each regional distribution district sign indicating number according to certain coded format to different area under one's jurisdictions by operator, and each regional distribution district sign indicating number is carried out related preservation with the affiliated user smart card in each area.
Said step b also comprises: operation area sign indicating number insert module is inserted operation area sign indicating number descriptor in the NIT table before; Generate the operation area sign indicating number descriptor of this area earlier; The coded format of this descriptor is by user definition; Entrained operation area sign indicating number is the ciphertext form after close spoon of clear text format or use agreement and the algorithm for encryption, can correctly resolve this operation area sign indicating number descriptor as long as can guarantee the CA module.
Among the said step b; Operation area sign indicating number insert module when generating run region code descriptor required operation area, this area sign indicating number must with general headend in distribute to this area the operation area sign indicating number keep synchronously, digital condition receiving system general headend is provided with administration module in initialization or when changing regional distribution district sign indicating number by the distribution district sign indicating number and connects notice sub-headend operation area sign indicating number insert module in time through VPN.
Among the said step b, employed QAM modulator requires to possess the function of revising the NIT table.
Among the said step b, the insertion position of operation area sign indicating number descriptor of carrying the respective regions of operation area sign indicating number is in first descriptor circulation after " the network description symbol length " field in the NIT table.
Among the said step c, when the operation area sign indicating number that carries in the sign indicating number descriptor of operation area is encrypted, needs region code that parsing module is set and based on the close spoon of the agreement of indicating in the descriptor and algorithm ciphertext is deciphered just and can obtain the operation area sign indicating number.
The invention has the beneficial effects as follows: reduced the use of hardware device, reduced cost, and need not NIT table distributing center, occupying system resources is less.
Description of drawings
Fig. 1 is the method flow diagram of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description.
The present invention is directed to digital TV region of the prior art and control cost and reach the big deficiency of occupying system resources more greatly, propose a kind of method that realizes the realization digital TV region control that cost is less and occupying system resources is little.
Embodiment:
This example is divided into two big steps with the method for whole realization digital TV region control: the sign indicating number initialization of smart card distribution district is provided with and change; The insertion of CAS sub-headend operation area sign indicating number and terminal area control.As shown in Figure 1, step 101-105 mainly realizes the initialization setting and the change of smart card distribution district sign indicating number among the figure, and step 201-207 mainly realizes the insertion and the terminal area control of CAS sub-headend operation area sign indicating number.Step 101,102 is provided with administration module by the distribution district sign indicating number and accomplishes, and step 201,202,203 is accomplished by operation area sign indicating number insert module, and step 104,105,205,206,207 is provided with parsing module by region code and accomplishes.
Step 101: the distribution district sign indicating number in each area under one's jurisdiction of generation/change: at the CAS general headend; Operator uses the distribution district sign indicating number that administration module is set and is directed against generation/change each regional distribution district sign indicating number in different area under one's jurisdictions according to certain coded format with rule, and all distribution district sign indicating numbers are wanted and can be distinguished mutually.Simultaneously, the distribution district sign indicating number is provided with administration module can send to the distribution district sign indicating number that newly forms corresponding area CAS sub-headend through VPN (VPN) connection operation area sign indicating number insert module.
Step 102: related distribution district sign indicating number and corresponding area under one's jurisdiction smart card: each the regional distribution district sign indicating number and the user smart card that form in the step 101 are carried out related preservation.If the distribution district sign indicating number is set for the first time, then each user smart card must with the related binding of the distribution district sign indicating number of affiliated area.
Step 103: generate smart card state and updating EMM data package and also send: CAS generates intelligent card state renewal EMM (Entitlement Management Message) packet to each user according to distribution district sign indicating number of preserving and smartcards information, and through CAS general headend equipment and each regional CAS sub-headend equipment smart card state and updating EMM data package is sent to each STB (STB) terminal.
Step 104:STB filters smart card state and updating EMM data package: the STB terminal filters out smart card state and updating EMM data package from TS stream, and sends this EMM packet the CA module of STB to.
Step 105: resolve smart card distribution district sign indicating number is set: region code is provided with parsing module is provided with smart card according to the region code in the EMM packet distribution district sign indicating number.
The insertion of CAS sub-headend operation area sign indicating number and terminal area control realize mainly may further comprise the steps:
Step 201: initialization/renewal native region operating code: sign indicating number is provided with distribution district, this area sign indicating number that administration module sends over from CAS general headend distribution district in reception, and this distribution district sign indicating number is set to the operation area sign indicating number of this area.
Step 202: generating run region code descriptor: operation area sign indicating number insert module is according to the privately owned descriptor format (mainly comprising descriptor tag, descriptor length, encrypted indicia, encryption key indices value or the like) and the native region operating code generating run range descriptors that define in advance.
Step 203: operation area sign indicating number descriptor is inserted among the TS stream NIT: operation area sign indicating number insert module is called the related command of QAM modulator; The operation area sign indicating number descriptor that generates is inserted into the assigned address of TS stream NIT table descriptor; This insertion position is that analyzing efficiency is the highest like this in first descriptor circulation after " the network description symbol length " field in the NIT table.
Step 204:TS stream modulation output: CAS sub-headend equipment will insert the TS stream modulation output behind the sign indicating number descriptor of operation area.
Step 205:STB resolves NIT and obtains operation area sign indicating number descriptor: region code is provided with parsing module and uses the STB correlation module to resolve the NIT in the TS stream, obtains operation area sign indicating number descriptor.
Step 206: parsing operation region code descriptor: region code is provided with parsing module according to predefined privately owned descriptor format, and parsing operation region code descriptor obtains the operation area sign indicating number.If the operation area sign indicating number that carries in the descriptor is encrypted, then need decipher ciphertext based on the key index and the algorithm of appointment in the descriptor.
Step 207: comparison domain sign indicating number; Accomplish Region control: region code is provided with the distribution district sign indicating number of storing in operation area sign indicating number that parsing module relatively obtains and the smart card; Have only the identical CA module of could moving that the CA table is filtered and handles, thereby realize Region control.
CA module described in the present invention and CA table belong to prior art, therefore no longer it are given unnecessary details.
Accomplish Region control among the present invention, only added this hardware device of QAM modulator at each CAS sub-headend, need not to increase other hardware device, reduced cost, and need not to adopt NIT table distributing center, occupying system resources is less.
Claims (7)
1. method that realizes digital TV region control is characterized in that: may further comprise the steps:
A. at the digital television conditional access system general headend; The distribution district sign indicating number is provided with administration module and generates the EMM packet that has distribution district, this area sign indicating number to the digital television conditional access system application according to distribution district sign indicating number and this area's STB terminal smart card information that operator provides; By digital television conditional access system the state renewal EMM of this EMM packet as the STB terminal smart card is multiplexed in the TS stream again; After STB terminal receives that this intelligent card state upgrades EMM; By region code parsing module is set and resolves this EMM packet, and the distribution district sign indicating number of smart card is set according to the region code that obtains;
B. at each sub-headend of digital television conditional access system, operation area sign indicating number insert module is through the operation area sign indicating number descriptor of QAM modulator ad-hoc location insertion respective regions in the NIT of TS stream table, in order to identify the zone that this TS stream can be allowed to play;
C. after STB receives TS stream; At first resolve the NIT table and obtain operation area sign indicating number descriptor; By region code parsing module parsing operation region code descriptor is set then and obtains the operation area sign indicating number; Have only when the operation area sign indicating number equals the distribution district sign indicating number in the smart card, the CA module in the STB terminal is just carried out filtration treatment to the CA table, thereby realizes Region control.
2. a kind of method that realizes digital TV region control as claimed in claim 1; It is characterized in that: said step a also comprises: the distribution district sign indicating number was provided with administration module before generating the EMM packet of band distribution district sign indicating number to the digital television conditional access system application; Generate each regional distribution district sign indicating number according to certain coded format to different area under one's jurisdictions by operator, and each regional distribution district sign indicating number is carried out related preservation with the affiliated user smart card in each area.
3. according to claim 1 or claim 2 a kind of realizes the method for digital TV region control; It is characterized in that: said step b also comprises: operation area sign indicating number insert module is inserted operation area sign indicating number descriptor in the NIT table before; Generate the operation area sign indicating number descriptor of this area earlier; The coded format of this descriptor is by user definition; Entrained operation area sign indicating number is the ciphertext form after close spoon of clear text format or use agreement and the algorithm for encryption, can correctly resolve this operation area sign indicating number descriptor as long as can guarantee the CA module.
4. according to claim 1 or claim 2 a kind of realizes the method for digital TV region control; It is characterized in that: among the said step b; Operation area sign indicating number insert module when generating run region code descriptor required operation area, this area sign indicating number must with general headend in distribute to this area the operation area sign indicating number keep synchronously, digital condition receiving system general headend is provided with administration module in initialization or when changing regional distribution district sign indicating number by the distribution district sign indicating number and connects notice sub-headend operation area sign indicating number insert module in time through VPN.
5. according to claim 1 or claim 2 a kind of realizes the method for digital TV region control, it is characterized in that: among the said step b, employed QAM modulator requires to possess the function of revising the NIT table.
6. according to claim 1 or claim 2 a kind of realizes the method for digital TV region control; It is characterized in that: among the said step b, the insertion position of operation area sign indicating number descriptor of carrying the respective regions of operation area sign indicating number is in first descriptor circulation after " the network description symbol length " field in the NIT table.
7. according to claim 1 or claim 2 a kind of realizes the method for digital TV region control; It is characterized in that: among the said step c; When the operation area sign indicating number that carries in the sign indicating number descriptor of operation area is encrypted, needs region code that parsing module is set and according to the close spoon of the agreement of indicating in the descriptor and algorithm ciphertext is deciphered just and can obtain the operation area sign indicating number.
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CN101635824B (en) * | 2009-08-11 | 2013-03-06 | 中山广电视讯有限公司 | Small area control system of digital television |
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CN102611929A (en) * | 2011-12-23 | 2012-07-25 | 福建新大陆通信科技股份有限公司 | Regional control method of digital television set-top box |
CN103260077B (en) * | 2012-02-15 | 2018-04-10 | 北京四达时代软件技术股份有限公司 | Digital TV region control method and the equipment based on this method |
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CN109525898A (en) * | 2018-12-26 | 2019-03-26 | 福建高图信息技术有限公司 | A kind of region control method and terminal of digital broadcasting |
CN109819283B (en) * | 2019-01-21 | 2021-03-23 | 湖北省广播电视信息网络股份有限公司 | Localized information pushing system and method |
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