CN101431655A - Method for implementing zone control of digital television - Google Patents
Method for implementing zone control of digital television Download PDFInfo
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- CN101431655A CN101431655A CNA2008103060615A CN200810306061A CN101431655A CN 101431655 A CN101431655 A CN 101431655A CN A2008103060615 A CNA2008103060615 A CN A2008103060615A CN 200810306061 A CN200810306061 A CN 200810306061A CN 101431655 A CN101431655 A CN 101431655A
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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 Digital Television, 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, may be not under the jurisdiction of each other between the networks at different levels, and independent operation, this just requires must carry out the multiple management system in the Digital Television operation.In order to guarantee the regional uniqueness and the legitimacy of set-top box 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 set-top box 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 at 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, choose local needed NIT table at each regional digital television conditional access system sub-headend (hereinafter to be referred as sub-headend) and shine upon, filter out the NIT table irrelevant with this area.
Method two, realize district management control by the provincial characteristics code stream, in this method, by the unified characteristic code flow that produces at each regional sub-headend of general headend, and send card by code stream and be sent to the agreement frequency, 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 allow one's respective area code stream output.When digital TV terminal is started shooting, the provincial characteristics code stream on the set-top box 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 at 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 by 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 set-top box 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 distribution district sign indicating number in the smart card, CA module in the STB terminal is just carried out filtration treatment to the CA table, thereby realizes Region control.
Described 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 at 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.
Described 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 defined by the user, entrained operation area sign indicating number can be a clear text format, also can be to use the ciphertext form after agreement secret key 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 described 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, require digital condition receiving system general headend by the distribution district sign indicating number administration module to be set usually and connect notice sub-headend operation area sign indicating number insert module in time by VPN (virtual private network) in initialization or when changing regional distribution district sign indicating number.
Among the described step b, employed QAM modulator requires to possess the function of revising the NIT table.
Among the described step b, the insertion position of carrying the privately owned descriptor of operation area sign indicating number is in first descriptor circulation after " network description symbol length " field in the NIT table.
Among the described 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 agreement secret key of indicating in the descriptor and algorithm ciphertext is decrypted just and can obtains 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
The invention will be further described below in conjunction with drawings and Examples.
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 finishes, and step 201,202,203 is finished by operation area sign indicating number insert module, and step 104,105,205,206,207 is provided with parsing module by region code and finishes.
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 generates/change each regional distribution district sign indicating number with rule at different area under one's jurisdictions according to certain coded format, 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 by VPN (VPN (virtual private network)) 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 send: CAS upgrades EMM (Entitlement Management Message) packet according to the intelligent card state that the distribution district sign indicating number of preserving and smartcards information generate at each user, and by CAS general headend equipment and each regional CAS sub-headend equipment smart card state and updating EMM data package is sent to each STB (set-top box) 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 this EMM packet is sent to the CA module of STB.
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: receive and distribution district, this area sign indicating number that administration module sends over is set, and this distribution district sign indicating number is set to the operation area sign indicating number of this area from CAS general headend distribution district sign indicating number.
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 pre-define.
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 " 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 the NIT in the parsing module use STB correlation module parsing 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 ciphertext to be decrypted according to the cipher key index and the algorithm of appointment in the descriptor.
Step 207: comparison domain sign indicating number, finish 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.
Finish 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)
- [claim 1] a kind of 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 by 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 set-top box 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 distribution district sign indicating number in the smart card, CA module in the STB terminal is just carried out filtration treatment to the CA table, thereby realizes Region control.
- [claim 2] a kind of method that realizes digital TV region control as claimed in claim 1, it is characterized in that: described 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 at 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.
- [claim 3] a kind of method that realizes digital TV region control as claimed in claim 1 or 2, it is characterized in that: described 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 defined by the user, entrained operation area sign indicating number can be a clear text format, also can be to use the ciphertext form after agreement secret key and the algorithm for encryption, can correctly resolve this operation area sign indicating number descriptor as long as can guarantee the CA module.
- [claim 4] a kind of method that realizes digital TV region control as claimed in claim 1 or 2, it is characterized in that: among the described 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, require digital condition receiving system general headend by the distribution district sign indicating number administration module to be set usually and connect notice sub-headend operation area sign indicating number insert module in time by VPN (virtual private network) in initialization or when changing regional distribution district sign indicating number.
- [claim 5] a kind of method that realizes digital TV region control as claimed in claim 1 or 2 is characterized in that: among the described step b, employed QAM modulator requires to possess the function of revising the NIT table.
- [claim 6] a kind of method that realizes digital TV region control as claimed in claim 1 or 2, it is characterized in that: among the described step b, the insertion position of carrying the privately owned descriptor of operation area sign indicating number is in first descriptor circulation after " network description symbol length " field in the NIT table.
- [claim 7] a kind of method that realizes digital TV region control as claimed in claim 1 or 2, it is characterized in that: among the described 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 agreement secret key of indicating in the descriptor and algorithm ciphertext is decrypted just and can obtains the operation area sign indicating number.
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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 |
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