CN102255719A - Method and device for realizing synchronization of cable modem - Google Patents
Method and device for realizing synchronization of cable modem Download PDFInfo
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- CN102255719A CN102255719A CN2010101773935A CN201010177393A CN102255719A CN 102255719 A CN102255719 A CN 102255719A CN 2010101773935 A CN2010101773935 A CN 2010101773935A CN 201010177393 A CN201010177393 A CN 201010177393A CN 102255719 A CN102255719 A CN 102255719A
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Abstract
The embodiment of the invention provides a method and device for realizing synchronization of a CM (Cable Modem). The method mainly comprises the following steps: a STB (Set-Top-Box) of a user side receives downlink channel information, sent by a network side, of a CMTS (Cable Modem Termination System); and the STB shares the downlink channel information with a CM such that the CM searches a downlink channel of the CMTS according to the downlink channel information to realize the synchronization with the CMTS. According to the embodiment of the invention, the CM directly obtains the downlink channel information from the STB to prevent that the CM blindly obtains the downlink channel information through downlink channel scanning; thus the CM quickly obtains the downlink channel information and can be quickly synchronized with the CMTS.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the synchronous method and apparatus of a kind of realization CM (Cable Modem, cable is adjusted demodulator).
Background technology
CMTS (Cable Modem Termination System, the cable modem terminating systems) belongs to head end (local side) equipment, can be deployed in the front end of cable TV network, also can be deployed in two-way HFC (hybrid fiber coaxial, Hybrid Fiber Coaxial) in the optical node in the network, wherein, CMTS plays a part gateway between data network and hfc plant;
CM is a terminal equipment, and between hfc plant and CPE (Customer PremiseEquipment, ustomer premises access equipment), CPE can comprise PC, IAD (IntegratedAccess Device, integrated access equipment), work station, network computer etc.The more common Modem complexity of the structure of CM, it is made up of modulator-demodulator, tuner, enciphering/deciphering module, bridger, network interface unit, ethernet concentrator etc., it need not dial up on the telephone, and does not take telephone wire, the 24-hour service that can provide online at any time to connect.The transmission medium of CM is a hfc plant, and behind certain transmission bandwidth, data-signal can be shared hfc plant with cable TV signal to CM with data signal modulation.
The communication process of CMTS and CM mainly comprises: after CMTS will encapsulate from the Frame that extraneous network receives, by back mixing of downlink data modulation obtaining the RF signal with analog catv signal, this RF signal is outputed to the down going channel of hfc plant, CM receives above-mentioned RF signal from down channel, this RF signal is sent to CPE after treatment.CM is modulated into radiofrequency signal with the digital uplink signal of CPE output, and this radiofrequency signal is outputed to the data feedback channel that HFC nets, and CMTS receives above-mentioned radiofrequency signal from up channel.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: above-mentioned CM needs and CMTS carries out Synchronous Processing when starting or down going channel when invalid.So CM scans down going channel, obtain the relevant information of down channel, the down going channel scanning of above-mentioned CM is a kind of blind scanning, and speed is very slow, and efficient is very low.
Summary of the invention
Embodiments of the invention provide a kind of CM of realization synchronous method and apparatus, obtain the relevant information of down going channel apace to realize CM.
A kind of cable of realizing is adjusted the synchronous method of demodulator, comprising:
The set-top box STB of user side receives the down going channel information of the cable modem terminating systems CMTS of network side transmission;
Described STB adjusts demodulator CM with described down going channel information sharing to cable so that described CM according to the down going channel of described down going channel information searching to described CMTS, realizes and described CMTS between synchronously.
A kind of set-top box STB comprises:
The down going channel information receiving module is used to receive the down going channel information of the cable modem terminating systems CMTS that network side sends;
The down going channel information sending module is used for described down going channel information sharing is adjusted demodulator CM to cable so that described CM according to the down going channel of described down going channel information searching to described CMTS, realizes and described CMTS between synchronously.
A kind of cable is adjusted demodulator CM, comprising:
Down going channel information acquisition module is used for when CM starts or when down going channel is invalid, sends the request of obtaining down going channel information to STB, receives the down going channel information that STB sends over;
Synchronous processing module is used for obtaining the down going channel information searching that the obtained down going channel to cable modem terminating systems CMTS according to described down going channel information, realize and described CMTS between synchronously.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, the embodiment of the invention is directly obtained down going channel information from STB by CM, avoided CM to obtain down going channel information by down channel scanning blindly, realized that CM obtains down going channel information apace, carry out apace and CMTS between synchronously.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The principle schematic of the method that a kind of CM of realization that Fig. 1 provides for the embodiment of the invention one is synchronous;
The concrete process chart of the method that a kind of CM of realization that Fig. 2 provides for the embodiment of the invention one is synchronous;
The specific implementation structure chart of a kind of STB that Fig. 3 provides for the embodiment of the invention;
The specific implementation structure chart of a kind of CMTS that Fig. 4 provides for the embodiment of the invention;
The specific implementation structure chart of a kind of CM that Fig. 5 provides for the embodiment of the invention.
Embodiment
For ease of understanding, be that example is further explained explanation below in conjunction with accompanying drawing with several specific embodiments, and each embodiment does not constitute the qualification to the embodiment of the invention to the embodiment of the invention.
Embodiment one
The principle schematic of the method that a kind of CM of realization that this embodiment provides is synchronous as shown in Figure 1, concrete handling process comprises following treatment step as shown in Figure 2:
In the head-end system of Digital Television, mainly comprise two funtion part: CMTS and DVB multiplexer.The DVB multiplexer communicates with the STB (Set Top Box, set-top box) that merges in the set-top box by the HFC bilateral network.Integrated STB and CM can handle TV signal and IP signal simultaneously in the fusion set-top box of above-mentioned user side.
Down channel between first setting of CMTS and CM, CMTS sends to the DVB multiplexer with the down going channel information that is provided with.Perhaps, when CMTS need reset descending channel information, the down going channel information after CMTS will upgrade sent to the DVB multiplexer.
Above-mentioned down going channel information spinner will comprise information such as frequency, symbol rate and modulation system.
The DVB multiplexer is preserved the down going channel information that above-mentioned CMTS sends over.Then, the DVB multiplexer is inserted into TS (Program Stream with above-mentioned down going channel information, transport stream) in the stream, the inserted mode of above-mentioned down going channel information in TS is consistent with the inserted mode of general service information in TS, above-mentioned down going channel information corresponding service type can be defined as 0x6F, this 0x6F type is reserved according to DVB agreement the type, and in actual applications, above-mentioned down going channel information corresponding service type can also be other value of DVB agreement reservation.
Then, the DVB multiplexer TS stream that will carry down going channel information sends by the HFC bilateral network and sends to the STB that merges in the set-top box.
STB analyzes above-mentioned down going channel information come out from TS stream after receiving the TS stream that above-mentioned DVB multiplexer sends over.Then, STB preserves above-mentioned down going channel information.
CM when starting or down going channel when invalid, need carry out and CMTS between Synchronous Processing.In this embodiment, CM scans down going channel no longer blindly, but directly by sending the request of obtaining down going channel information to STB, after STB receives this request, the down going channel information of above-mentioned preservation is sent to CM.
CM finds the down going channel of CMTS according to the above-mentioned down going channel information of obtaining, and receives the RF signal that CMTS sends by this down going channel.CM obtains the data feedback channel information of CMTS from the RF signal that receives, send radiofrequency signal according to this data feedback channel information to CMTS.Thereby between CM and CMTS, set up data transmission channel, CM realized and CMTS between Synchronous Processing, realize and CMTS between synchronously.Then, CM can receive the descending RF signal that CMTS sends from down channel.In actual applications, above-mentioned down channel can comprise: main with down going channel information and standby down going channel information, when the master was invalid with down going channel information, CM can use standby down going channel to receive descending RF signal.
Among this embodiment, CM obtains the down going channel information that CMTS sends by STB, has avoided CM to obtain down going channel information by down channel scanning blindly, has realized that CM obtains down going channel information apace, carry out apace and CMTS between synchronously.
The embodiment of the invention also provides a kind of STB, is positioned at the fusion set-top box inside of user side, is connected with CM by data channel in fusion set-top box inside, and above-mentioned fusion set-top box is connected by CMTS, the DVB multiplexer of HFC bilateral network and network side.Its specific implementation structure specifically can comprise as shown in Figure 3:
Down going channel information receiving module 31 is used to receive the down going channel information of the cable modem terminating systems CMTS that network side sends.In actual applications, CMTS can send to down going channel information the digital video broadcasting multiplexer of network side, this digital video broadcasting multiplexer will carry down going channel transmission of Information stream by the HFC bilateral network again and send to STB, and STB obtains described down going channel information from described transport stream.
Down going channel information sending module 33 is used for described down going channel information is sent to CM so that described CM realizes according to described down going channel information and described CMTS between synchronously.
Described STB can also comprise:
Down going channel information is preserved module 32, is used for the down going channel information that described down going channel information receiving module is received and preserves;
Described down going channel information sending module 33, after the request of obtaining down going channel information that receives the CM transmission, the down going channel information of described preservation is sent to described CM, described request of obtaining down going channel information is described CM when starting or when down going channel is invalid, sends to described STB.
The embodiment of the invention also provides a kind of CMTS, is positioned at network side, is connected with the DVB multiplexer of network side, and is connected by the fusion set-top box of HFC bilateral network and user side.Its specific implementation structure specifically can comprise as shown in Figure 4:
First sending module 41 when being used for the down going channel information between first setting of CMTS and cable adjustment demodulator CM, sends to the digital video broadcasting multiplexer with the down going channel information that is provided with;
Second sending module 42 is used for when CMTS need reset down going channel information, and the down going channel information after upgrading is sent to the digital video broadcasting multiplexer.
The embodiment of the invention also provides a kind of CM, is positioned at the fusion set-top box inside of user side, is connected with STB by data channel in fusion set-top box inside, and above-mentioned fusion set-top box is connected by CMTS, the DVB multiplexer of HFC bilateral network and network side.Its specific implementation structure specifically can comprise as shown in Figure 5:
Down going channel information acquisition module 51 is used for when CM starts or when down going channel is invalid, sends the request of obtaining down going channel information to STB, receives the down going channel information that STB sends over; Perhaps, when CM starts or when down going channel is invalid, obtain the down going channel information that described STB preserves from STB;
Synchronous processing module 52 is used for obtaining the 51 down going channel information searchings that obtain to the down going channel of described CMTS according to described down going channel information, realize and CMTS between synchronously.
CMTS, the CM and the STB that utilize the invention described above embodiment to provide, CMTS can be handed down to STB with the digital video broadcasting multiplexer of down going channel information by network side, the down going channel information that STB can issue network side is preserved, and CM directly obtains down going channel information from STB.Thereby avoided CM to obtain down going channel information by down channel scanning blindly, realized CM when starting or down channel obtain down going channel information apace when invalid, carry out apace and CMTS between synchronously.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
In sum, the embodiment of the invention is directly obtained down going channel information from STB by CM, avoided CM to obtain down going channel information by down channel scanning blindly, realized CM when starting or down channel obtain down going channel information apace when invalid, carry out apace and CMTS between synchronously.
The embodiment of the invention is compared with prior art, can make CM obtain down going channel information, finish and CMTS between the time average of channel synchronization save three minutes and more than.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. realize the synchronous method of cable adjustment demodulator for one kind, it is characterized in that, comprising:
The set-top box STB of user side receives the down going channel information of the cable modem terminating systems CMTS of network side transmission;
Described STB adjusts demodulator CM with described down going channel information sharing to cable so that described CM according to the down going channel of described down going channel information searching to described CMTS, realizes and described CMTS between synchronously.
2. realization cable according to claim 1 is adjusted the synchronous method of demodulator, it is characterized in that, the STB of described user side receives the down going channel information of the cable modem terminating systems CMTS of network side transmission, comprising:
The digital video broadcasting multiplexer that the STB of described user side receives network side flows by the down going channel transmission of Information of having carried CMTS that the Hybrid Fiber Coaxial network sends;
From described transport stream, obtain described down going channel information.
3. realization cable according to claim 1 is adjusted the synchronous method of demodulator, it is characterized in that described down going channel information comprises: main with down going channel information and standby down going channel information.
4. adjust the synchronous method of demodulator according to claim 1 or 2 or 3 described realization cables, it is characterized in that described described STB adjusts demodulator CM with described down going channel information sharing to cable, comprising:
The described down going channel information that described STB will receive is preserved;
Described STB is receiving CM when starting or after the request of obtaining down going channel information that sends when invalid of down going channel, and the down going channel information of described preservation is sent to described CM.
5. a set-top box STB is characterized in that, comprising:
The down going channel information receiving module is used to receive the down going channel information of the cable modem terminating systems CMTS that network side sends;
The down going channel information sending module is used for described down going channel information sharing is adjusted demodulator CM to cable so that described CM according to the down going channel of described down going channel information searching to described CMTS, realizes and described CMTS between synchronously.
6. STB according to claim 5 is characterized in that, described STB also comprises:
Down going channel information is preserved module, is used for the down going channel information that described down going channel information receiving module is received and preserves;
Described down going channel information sending module is used for receiving described CM when starting or after the request of obtaining down going channel information that sends when invalid of down going channel, and the down going channel information of described preservation is sent to described CM.
7. a cable is adjusted demodulator CM, it is characterized in that, comprising:
Down going channel information acquisition module is used for when CM starts or when down going channel is invalid, sends the request of obtaining down going channel information to STB, receives the down going channel information that STB sends over;
Synchronous processing module is used for obtaining the down going channel information searching that the obtained down going channel to cable modem terminating systems CMTS according to described down going channel information, realize and described CMTS between synchronously.
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| CN2010101773935A CN102255719A (en) | 2010-05-17 | 2010-05-17 | Method and device for realizing synchronization of cable modem |
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| CN2010101773935A CN102255719A (en) | 2010-05-17 | 2010-05-17 | Method and device for realizing synchronization of cable modem |
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Cited By (7)
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| CN102938780A (en) * | 2012-10-26 | 2013-02-20 | 浪潮(山东)电子信息有限公司 | Video telephone system and method of cable digital television network based on cloud computing platform |
| CN103596018A (en) * | 2013-11-22 | 2014-02-19 | 深圳创维数字技术股份有限公司 | Rapid on-line method and device |
| WO2015027418A1 (en) * | 2013-08-29 | 2015-03-05 | Thomson Licensing | Cable modem |
| CN104506942A (en) * | 2014-12-23 | 2015-04-08 | 深圳市九洲电器有限公司 | Set-top box and upgrading method of cable modem system of set-top box |
| CN105187681A (en) * | 2015-09-15 | 2015-12-23 | 广东九联科技股份有限公司 | Method for realizing rapid on-line operation of cable modem |
| WO2018058322A1 (en) * | 2016-09-27 | 2018-04-05 | 华为技术有限公司 | Channel parameter estimation method and related apparatus |
| CN111372106A (en) * | 2020-03-18 | 2020-07-03 | 广西广播电视信息网络股份有限公司 | Method for realizing all-IP digital television conditional receiving technology through CMTS |
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| CN102938780A (en) * | 2012-10-26 | 2013-02-20 | 浪潮(山东)电子信息有限公司 | Video telephone system and method of cable digital television network based on cloud computing platform |
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| CN104506942B (en) * | 2014-12-23 | 2018-05-29 | 深圳市九洲电器有限公司 | The upgrade method of set-top box and its cable modem system |
| CN105187681A (en) * | 2015-09-15 | 2015-12-23 | 广东九联科技股份有限公司 | Method for realizing rapid on-line operation of cable modem |
| CN105187681B (en) * | 2015-09-15 | 2019-01-11 | 广东九联科技股份有限公司 | A kind of method of Cable Modem Quick thread |
| WO2018058322A1 (en) * | 2016-09-27 | 2018-04-05 | 华为技术有限公司 | Channel parameter estimation method and related apparatus |
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| CN111372106A (en) * | 2020-03-18 | 2020-07-03 | 广西广播电视信息网络股份有限公司 | Method for realizing all-IP digital television conditional receiving technology through CMTS |
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Application publication date: 20111123 |