CN105531940A - Time synchronization method, apparatus and system - Google Patents
Time synchronization method, apparatus and system Download PDFInfo
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- CN105531940A CN105531940A CN201480010035.1A CN201480010035A CN105531940A CN 105531940 A CN105531940 A CN 105531940A CN 201480010035 A CN201480010035 A CN 201480010035A CN 105531940 A CN105531940 A CN 105531940A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/027—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
Abstract
Provided are a time synchronization method, apparatus and system. The method comprises: a CMTS device acquires a data flow from an SNI, extracts a time message from the data flow including the time message and a data message, then sends the time message to a CM via a signalling channel and sends the data message to the CM via a data channel, wherein the signalling channel and the data channel are different in working frequency points. Since the signalling channel transmitting the time message has a fixed processing time delay, there is no time delay variation, and precision of time information in the transmitted time message is guaranteed, so that precise time synchronization in a DOCSIS network can be realized.
Description
The methods, devices and systems of time synchronized
Technical field
The present embodiments relate to the communication technology, more particularly to a kind of Shi Jian Tong Walk methods, devices and systems.Background technology
Mobile network is from macro base station to micro-base station evolution by the mainstream construction pattern as following 4G networks, and cable television operators possess the external cable factory for covering, possessing high bandwidth capability extensively（Cable outside plant) resource, and there is engineer applied ripe extensively carrying out field broadband access equipment installation, therefore be the optimal carrying return network that micro-base station carries out indoor or outdoors deployment.
Current cable of cable TV（Cable) mainstream technology of access network is data over cable service interface specification（Data Over Cable Service Interface Specifications, referred to as：DOCSIS), wherein, Cable Modem Terminal System（Cable Modem Terminal Systems, referred to as：CMTS) equipment and cable modem termination（Cable Modem, referred to as：CM communication process) is：The data frame that CMTS equipment is received from extraneous network is encapsulated in dynamic image expert group（Moving Pictures Experts Group, referred to as：MPEG) timestamp（Timestamp, referred to as：TS) in frame, by the way that output radio frequency is mixed after modulate downstream data with analog catv signal（Radio Frequency, referred to as：RF) signal is to hybrid fiber coax（Hybrid Fiber Coaxial, referred to as：HFC) network, CMTS equipment receives the signal of uplink receiver output simultaneously, and data-signal is converted into ethernet frame to data conversion module.
Most widely used in packet network, technology most it is ripe be Institute of Electrical and Electric Engineers (Institute of Electrical and Electronics Engineers, simple standing grain you：IEEE) 1588. V2 Tong Walk technologies.IEEE1588.V2 is a kind of principal and subordinate Tong Walk systems, during system Tong Walk, the master clock cycle issue true Shi Zhong Tong Walk agreements of Jing（Precision Time Protocol, referred to as：PTP) and temporal information, the timestamp information that master clock port is sent is received from clock port, system calculates the delay of principal and subordinate's wire time and principal and subordinate's time difference accordingly.Due to passing through the adaptive clock recoveries of IEEE 1588（Adaptive Clock Recovery, referred to as：ACR) function can to realize the transparent transmission of clock in DOCSIS networks, based on circuit emulation service (Circuit Emulation Service, referred to as：CES source clock) is recovered using adaptive method, the existing frequency rate based on IEEE1588 ACR there are two kinds with Walk embodiment,
One is to dispose 1588 ACR servers in local side（Server) as clock source, 1588 ACR clients of embedded in base station are then started（Client) function, directly recovers clock signal from data message；Another way is to install to support 1588 ACR special clock equipment in base station side, recovers after master clock and to be supplied to base station as external clock reference.
But, the ACR of IEEE 1588 are only capable of recovered clock information, can not recovery time information, and the quality of ACR recovered clocks is highly dependent on the performances of DOCSIS bearer networks, and such as propagation delay time, shake, packet loss and bandwidth can cause to have a strong impact on to the precision of ACR recovered clocks.The content of the invention
The embodiment of the present invention provides a kind of Shi Jian Tong Walk methods, devices and systems, to realize accurate Shi Jian Tong Walk in DOCSIS networks.
In a first aspect, the embodiment of the present invention provides a kind of Shi Jian Tong Walk method, including：
Cable Modem Terminal System CMTS equipment obtains data flow from SNI SNI, and extracts time message from the data flow；Wherein, data message and the time message are included in the data flow；
The time message is sent to cable modem termination CM by the CMTS equipment by signalling path, and the data message is sent into the CM by data channel;Wherein, the signalling path is different from the working frequency points of the data channel.
In the first possible implementation of first aspect, the signalling path is outband management passage OOB;Wherein, the OOB has fixed Base-Band Processing time delay.
It is described to extract time message from the data flow in second of possible implementation with reference to the first possible implementation of first aspect or first aspect, including：
The CMTS equipment extracts the time message according to message format from the data flow.Second aspect, the embodiment of the present invention provides a kind of Shi Jian Tong Walk method, including：
Cable modem termination CM receives time message and the data message that Cable Modem Terminal System CMTS equipment is sent；Wherein, the time message is that the CMTS equipment is sent by signalling path, and the data message is that the CMTS equipment is sent by data channel, wherein, the signalling path is different from the working frequency points of the data channel；
The time message is incorporated into the data message by User-Network Interface UNI and is sent to next stage mobile base station equipment by the CM.
In the first possible implementation of second aspect, the time message is incorporated into the data message by User-Network Interface UNI and is sent to next stage mobile base station equipment by the CM, including：The time message and the data message are sent jointly to next stage mobile base station equipment by the CM by the UNI.
The third aspect, the embodiment of the present invention provides a kind of Cable Modem Terminal System CMTS equipment, including：
Acquisition module, for obtaining data flow from SNI SNI, and extracts time message from the data flow；Wherein, data message and the time message are included in the data flow；
Sending module, for the time message to be sent into cable modem termination CM by signalling path, the CM is sent to by the data message by data channel;Wherein, the signalling path is different from the working frequency points of the data channel.
In the first possible implementation of the third aspect, the signalling path is outband management passage OOB;Wherein, the OOB has fixed Base-Band Processing time delay.
With reference to the first possible implementation of the third aspect or the third aspect, in second of possible implementation, the acquisition module specifically for：The time message is extracted from the data flow according to message format.
Fourth aspect, the embodiment of the present invention provides a kind of cable modem termination CM, including：Receiving module, time message and data message for receiving the transmission of Cable Modem Terminal System CMTS equipment；Wherein, the time message is that the CMTS equipment is sent by signalling path, and the data message is that the CMTS equipment is sent by data channel, wherein, the signalling path is different from the working frequency points of the data channel；
Sending module, for the time message to be incorporated into the data message by User-Network Interface UNI and next stage mobile base station equipment is sent to.
In the first possible implementation of fourth aspect, the sending module by the time message and the data message by the UNI specifically for sending jointly to next stage mobile base station equipment.
5th aspect, the embodiment of the present invention provides a kind of Shi Jian Tong Walk system, the Cable Modem Terminal System CMTS equipment as described in any in second of possible implementation of the third aspect to the third aspect, and the cable modem termination CM as described in any in the first possible implementation of fourth aspect to fourth aspect.
Shi Jian Tong Walk provided in an embodiment of the present invention methods, devices and systems, data flow is obtained from SNI by CMTS equipment, and extract time message from the data flow comprising time message and data message, then time message by signalling path, by data message by data channel is sent to CM;Wherein, signalling path is different from the working frequency points of data channel；Because the signalling path of transmission time message has fixed processing delay, in the absence of delay variation, it is ensured that the precision of temporal information in the time message of transmission, therefore accurate Shi Jian Tong Walk can be realized in DOCSIS networks.Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, the required accompanying drawing used in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of Shi Jian Tong Walk of the present invention embodiment of the method one；
Fig. 2 is the flow chart of Shi Jian Tong Walk of the present invention embodiment of the method two；
Fig. 3 realizes configuration diagram for Shi Jian Tong Walk of the present invention embodiment of the method；
Fig. 4 is the structural representation of CMTS apparatus embodiments one of the present invention；
Fig. 5 is the structural representation of CM embodiments one of the present invention.Embodiment is to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.
Fig. 1 is the flow chart of Shi Jian Tong Walk of the present invention embodiment of the method one.The method that the present embodiment is provided can be performed by CMTS equipment, as shown in figure 1, specifically, the method that the present embodiment is provided can include：
S101, CMTS equipment are from SNI（Service Node Interface, referred to as：SNI data flow) is obtained, and time message is extracted from the data flow；Wherein, included in the data flow
Data message and the time message.
It should be noted that CMTS equipment completed when equipment is initialized with master clock Tong Walk, generation and master clock are with the local clock of phase, the local clock of CMTS equipment is included in the time message frequently.
During this Walk is rapid, due to including data message and time message from the data flow that SNI is obtained, in order to which time message is extracted from data flow, CMTS equipment can extract time message according to message format from data flow, and time message is sent into CM by single signalling path.
The time message is sent to CM by S102, the CMTS equipment by signalling path, and the data message is sent into the CM by data channel;Wherein, the signalling path is different from the working frequency points of the data channel.
Generally, CMTS equipment uses QPSK（Quadrature Phase Shift Keying, referred to as：QPSK mode) is modulated to time message, is then sent to CM by signalling path.
It should be noted that, because signalling path has fixed processing delay, and signalling path can be realized using single up-downgoing frequency in Cable access systems, therefore signalling path can be realized with data channel by the way of frequency division multiplexing, and signalling path can use smaller spectrum width because data volume is small, such as 160KHz, 320KHz, the consuming to system spectral resources is also smaller.
Specifically, in the present embodiment, the signalling path can be outband management passage（Out Of Band, referred to as： OOB ) ；Wherein, the OOB has fixed Base-Band Processing time delay, i.e., no delay variation, therefore can ensure the precision by the OOB temporal informations transmitted.
The technical scheme of the present embodiment, data flow is obtained from SNI by CMTS equipment, and extract time message from the data flow comprising time message and data message, then time message by signalling path, by data message by data channel is sent to CM;Wherein, signalling path is different from the working frequency points of data channel；Because the signalling path of transmission time message has fixed processing delay, in the absence of delay variation, it is ensured that the precision of temporal information in the time message of transmission, therefore accurate Shi Jian Tong Walk can be realized in DOCSIS networks.
Fig. 2 is the flow chart of Shi Jian Tong Walk of the present invention embodiment of the method two.As shown in Fig. 2 the method that the present embodiment is provided can specifically be performed by cm device, specifically, the method for the Shi Jian Tong Walk that the present embodiment is provided can include：
S20 CM receive time message and the data message that CMTS equipment is sent；Wherein, the time message is that the CMTS equipment is sent by signalling path, and the data message is that the CMTS equipment is sent by data channel, wherein, the signalling path and the working frequency points of the data channel
It is different；
S202, the CM pass through User Network Interface（User Networks interface, referred to as：UNI the time message) is incorporated into the data message and next stage mobile base station equipment is sent to.
Specifically, it is described the time message is incorporated into the data message and is sent to next stage mobile base station equipment include：The time message and the data message are sent jointly to next stage mobile base station equipment by the CM by the UNI, and the time message and the data message are combined into a data stream by gp, are transmitted to next stage mobile base station equipment.
In the technical scheme of the present embodiment, CM receives time message, the data message by data channel reception CMTS equipment transmissions that CMTS equipment is sent by signalling path, wherein, signalling path is different from the working frequency points of data channel, time message is incorporated into after data message by UNI again and is sent to next stage mobile base station equipment, because signalling path has fixed processing delay, the precision of temporal information in the time message that CM is received can be ensured, therefore accurate Shi Jian Tong Walk can be realized in DOCSIS networks.
With reference to method Jin traveling Yi Walk explanations of the Fig. 3 Tong Walk Shi of the present invention.
In the present embodiment, by temporal information in the SNI upper united mouths of CMTS equipment, i.e. time message is separated from the data channel of broadband, distal end cm device is passed to using single narrow band signalling passage, then CM UNI is after the temporal information that narrow band signalling channel reception is arrived is incorporated into, for precise time information of the next stage mobile base station equipment with circuit-switched data, deadline Tong Walk is come with this.
As shown in figure 3, the technical scheme of the present embodiment mainly includes TS＆ phaselocked loops（Phase Locked Loop, referred to as：PLL) module, sequential（Timing) Media access contorl（Medium Access Control, abbreviation MAC) module and Timing physical layers（Physical Layer) module, wherein, TS＆PLL modules are responsible for producing with master clock with local clock of the frequency with phase, i.e. temporal information；Timing MAC modules are responsible for temporal information being packaged into time message, and complete the function such as ranging and One Way Delay measuring and calculating；Timing PHY modules are responsible for the modulation of data, to simplify design, generally by the way of QPSK；SNI/DTI PHY modules are the Shi Jian Tong Walk interface modules of upper united mouth physical layer, are responsible for completing the Tong Walk Jian the Shi of upper network equipment；UNI/DTI PHY modules are the Shi Jian Tong Walk interface modules of user interface physical layer, are responsible for next stage mobile base station equipment and provide precise time；MAC module and PHY modules are respectively the medium access layer processing module and physical channel processing module of data channel.
Narrow band signalling passage can generally be realized in Cable access systems using single up frequency and descending frequency, use frequency division multiplexing mode with the signal of data channel, signalling path is due to data volume I
To use smaller spectrum width, such as 160KHz, 320KHZ etc., the consuming to system spectral resources is smaller.
When Shi Jian Tong Walk are realized using single signalling path, in CMTS equipment ends, the signalling path can pass through field programmable gate array with a DOCSIS-realization in CMTS equipment in cm device（Field-Programmable Gate Array, referred to as：FPGA) realize.Specifically, CMTS equipment comes out the time in upstream Interface data channel, separated phase, temporal information is packaged into single time message, by the signalling path that different frequent points are operated in data channel, to CM passing time information in hfc plant, so that deadline Tong Walk.
In another feasible implementation, OOB passages can be borrowed as signalling path passing time information.It should be noted that the independent bidirectional data path that OOB passages are cable television access systems to be set up outside DOCSIS, for transmitting electric program menu（Electronic Program Guide, referred to as：EPG) programme, video on demand techniques（Video On Demand are referred to as：VOD) the information such as program request signaling, set top box control signaling.OOB passages physical layer is using special up-downgoing PHY and MAC technologies, and down going channel frequency is operated in 70 ~ 130MHz, and frequency spectrum broadband is l ~ 2MHz;Data feedback channel is operated in 5 ~ 42MHz, and frequency spectrum broadband is 192KHz ~ 2MHz, and up-downgoing PHY is modulated using differential QPSK.Because OOB passages have the advantages that data volume is small, technology is simple, it is highly suitable for as the signalling path for realizing Shi Jian Tong Walk, therefore Shi Jian Tong Walk can be realized by protocol extension by OOB passages, extra spectral overhead is not produced to cable television access system.
Specifically, OOB passages are main by OOB demodulators in CMTS equipment ends（Demodulator), OOB modulators（Modulator), network controller（Network Controller) and data transmission interface server（DTI Server) totally four equipment, wherein, OOB Demodulator are the up PHY of OOB passages, OOB Modulator are the descending PHY of OOB passages, because the processing of OOB PHY baseband modulations is in units of regular length frame, fixed Base-Band Processing time delay can be provided for data link, therefore the Timing PHY modules of the present embodiment can directly reuse OOB PHY, during for OOB signaling datas and Timing between provide unified physical layer modulation module with Walk signaling datas；DTI Server provide global clock function for all local side apparatus, thus can as the present embodiment TS＆PLL modules；Network Controller can be OOB MAC entity, frequently with general central processor（Central Processing Unit, referred to as：CPU) and software is realized, it can increase a software module extend Timing MAC functions in Network Controller in the present embodiment.
In CM terminals, OOB PHY are generally realized using an integrated chip, with CMTS equipment
End is similar, can also use it for Timing PHY, and Timing MAC can be achieved by extending CM CPU softwares.
As shown in figure 3, the process for realizing accurate Shi Jian Tong Walk by the technical scheme of the present embodiment is specially：
CMTS equipment side, SNI/DTI PHY modules are completed in after the Shi Jian Tong Walk of upper network equipment, for signalling path, TS＆PLL modules are produced with master clock with local clock of the frequency with phase, i.e. after temporal information, temporal information is passed into Timing MAC modules, temporal information is packaged into time message by Timing MAC modules, and time message is passed into Timing PHY modules, Timing PHY modules are sent to the cm device of distal end after being modulated to time message；Simultaneously, after SNI/DTI PHY modules are completed in the Shi Jian Tong Walk of upper network equipment, for data channel, after MAC module and PHY modules are handled data message according to the scheme of prior art respectively, data message is also sent to the cm device of distal end.
Cm device side, for data channel, after the MAC module and PHY modules of cm device are handled the data message received also according to the scheme of prior art, pass to UNI/DTI PHY modules, for signalling path, after the Timing PHY modules of cm device are demodulated to the time message received, pass to Timing MAC modules, Timing MAC modules parse temporal information from time message, then temporal information is passed into TS＆PLL modules, TS＆PLL modules are according to time information renovation local clock, produce new temporal information, new temporal information is passed into UNI/DTI PHY modules again, the data message received and temporal information are passed to next stage mobile base station equipment by UNI/DTI PHY modules together, due to SNI/DTI PHY modules, TS＆PLL modules, Timing MAC modules, Timing PHY modules and UNI/DTI PHY modules are respectively provided with fixed time delay, so as to pass through above-mentioned technical proposal, accurate Shi Jian Tong Walk can be realized in DOCSIS networks.
The technical scheme of the present embodiment, can realize Shi Jian Tong Walk in DOCSIS networks.
Fig. 4 is the structural representation of CMTS apparatus embodiments one of the present invention.As shown in figure 4, the CMTS equipment 10 that the present embodiment is provided can specifically include：Acquisition module 11 and sending module 12.
Wherein, acquisition module 11 is used to obtain data flow from SNI, and extracts time message from the data flow；Wherein, data message and the time message are included in the data flow；
Sending module 12 is used to the time message being sent to CM by signalling path, and the data message is sent into the CM by data channel;Wherein, the signalling path is different from the working frequency points of the data channel.
It should be noted that CMTS equipment 10 completed when equipment is initialized with master clock Tong Walk, generation and master clock are with the local clock of phase, the local clock of CMTS equipment 10 is included in the time message frequently.
Specifically, in order to which time message is extracted from data flow, the acquisition module 11 specifically can extract the time message according to message format from the data flow, time message is sent to CM by single signalling path.
Generally, after the sending module 12 by the way of QPSK to time message using being modulated, time message is sent to CM by signalling path.
It should be noted that, because signalling path has fixed processing delay, and signalling path can be realized using single up-downgoing frequency in Cable access systems, therefore signalling path can be realized with data channel by the way of frequency division multiplexing, and signalling path can use smaller spectrum width because data volume is small, such as 160KHz, 320KHz, the consuming to system spectral resources is also smaller.
In a kind of feasible embodiment, the signalling path can be OOB;Wherein, the OOB has fixed Base-Band Processing time delay, i.e., no delay variation, therefore can ensure the precision by the OOB temporal informations transmitted.
The CMTS equipment that the present embodiment is provided, available for the technical scheme for performing above method embodiment, its implementing principle and technical effect is similar, and here is omitted.
Fig. 5 is the structural representation of CM embodiments one of the present invention.As shown in figure 5, the CM 20 that the present embodiment is provided can specifically include：Receiving module 21 and sending module 22.
Wherein, receiving module 21 can be used for receiving time message and the data message that CMTS equipment is sent；Wherein, the time message is that the CMTS equipment is sent by signalling path, and the data message is that the CMTS equipment is sent by data channel, wherein, the signalling path is different from the working frequency points of the data channel；
Sending module 22 can be used for the time message is incorporated into the data message by UNI and be sent to next stage mobile base station equipment.
Specifically, the time message and the data message specifically can be sent jointly to next stage mobile base station equipment by the sending module 22 by the UNI, gp, the time message and the data message are combined into a data stream, transmitted to next stage mobile base station equipment.
The CM that the present embodiment is provided, available for the technical scheme for performing above method embodiment, its implementing principle and technical effect is similar, and here is omitted.
The present embodiment provide it is a kind of when between with Walk system, the present embodiment provide when between with Walk system specifically can include as above-mentioned embodiment provide CMTS equipment and as above-mentioned embodiment provide CM.
Wherein, the CMTS equipment that the present embodiment is provided can include acquisition module and sending module, and particular content is referring to acquisition module 11 and sending module 12 in the CMTS equipment 10 of above-described embodiment, and here is omitted.
The CM that the present embodiment is provided can include receiving module and sending module, and particular content is referring to receiving module 21 and sending module 22 in the CM 20 of above-described embodiment, and here is omitted.
In several embodiments provided by the present invention, it should be understood that disclosed apparatus and method, it can realize by another way.For example, device embodiment described above is only schematical, for example, the division of the unit, it is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.Another, it, by some interfaces, the INDIRECT COUPLING or communication connection of device or unit, can be electrical, machinery or other forms that shown or discussed coupling or direct-coupling or communication connection each other, which can be,.
The unit illustrated as separating component can be or may not be physically separate, and the part shown as unit can be or may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Some or all of unit therein can be selected to realize the purpose of this embodiment scheme according to the actual needs.
In addition, each functional unit in each of the invention embodiment can be integrated in a processing unit or unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated unit can both be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in a computer read/write memory medium.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are to cause a computer equipment（Can be personal computer, server, or network equipment etc.）Or processor（Processor the present invention each embodiment methods described Bu Fen Walk) are performed rapid.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage（Read-Only Memory, ROM), random access memory（Random Access Memory, RAM), magnetic disc or CD etc. are various can be with the medium of store program codes.
Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned
The division of each functional module is illustrated, in practical application, it can as needed and by above-mentioned functions distribute and be completed by different functional modules, i.e., the internal structure of device is divided into different functional modules, to complete all or part of function described above.The specific work process of the device of foregoing description, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although the present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent substitution to which part or all technical characteristic；And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.
Claims (9)
- Claims1st, a kind of Shi Jian Tong Walk method, it is characterised in that including：Cable Modem Terminal System CMTS equipment obtains data flow from SNI SNI, and extracts time message from the data flow；Wherein, data message and the time message are included in the data flow；The time message is sent to cable modem termination CM by the CMTS equipment by signalling path, and the data message is sent into the CM by data channel;Wherein, the signalling path is different from the working frequency points of the data channel.2nd, according to the method described in claim 1, it is characterised in that the signalling path is outband management passage OOB;Wherein, the OOB has fixed Base-Band Processing time delay.3rd, method according to claim 1 or 2, it is characterised in that described to extract time message from the data flow, including：The CMTS equipment extracts the time message according to message format from the data flow.4th, a kind of Shi Jian Tong Walk method, it is characterised in that including：Cable modem termination CM receives time message and the data message that Cable Modem Terminal System CMTS equipment is sent；Wherein, the time message is that the CMTS equipment is sent by signalling path, and the data message is that the CMTS equipment is sent by data channel, wherein, the signalling path is different from the working frequency points of the data channel；The time message is incorporated into the data message by User-Network Interface UNI and is sent to next stage mobile base station equipment by the CM.5th, method according to claim 4, it is characterised in that the time message is incorporated into the data message by User-Network Interface UNI and is sent to next stage mobile base station equipment by the CM, including：The time message and the data message are sent jointly to next stage mobile base station equipment by the CM by the UNI.6th, a kind of Cable Modem Terminal System CMTS equipment, it is characterised in that including：Acquisition module, for obtaining data flow from SNI SNI, and extracts time message from the data flow；Wherein, data message and the time message are included in the data flow；Sending module, for the time message to be sent into cable modem termination CM by signalling path, the CM is sent to by the data message by data channel;Wherein, the signalling path It is different from the working frequency points of the data channel.7th, CMTS equipment according to claim 6, it is characterised in that the signalling path is outband management passage OOB;Wherein, the OOB has fixed Base-Band Processing time delay.8th, the CMTS equipment according to claim 6 or 7, it is characterised in that the acquisition module specifically for：The time message is extracted from the data flow according to message format.9th, a kind of cable modem termination CM, it is characterised in that including：Receiving module, time message and data message for receiving the transmission of Cable Modem Terminal System CMTS equipment；Wherein, the time message is that the CMTS equipment is sent by signalling path, and the data message is that the CMTS equipment is sent by data channel, wherein, the signalling path is different from the working frequency points of the data channel；Sending module, for the time message to be incorporated into the data message by User-Network Interface UNI and next stage mobile base station equipment is sent to.10th, CM according to claim 9, it is characterised in that the sending module by the time message and the data message by the UNI specifically for sending jointly to next stage mobile base station equipment.11st, a kind of Shi Jian Tong Walk system, it is characterised in that including the Cable Modem Terminal System CMTS equipment as described in claim 6-8 is any, and the cable modem termination CM as described in claim 9-10 is any.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1630991A (en) * | 2001-04-03 | 2005-06-22 | 汤姆森许可公司 | Time synchronization for data over a powerline modem network |
| CN101043604A (en) * | 2005-11-30 | 2007-09-26 | Lg电子株式会社 | Cable broadcasting receiver and method for controlling power supply |
| CN101388750B (en) * | 2008-10-31 | 2012-07-04 | 北京九方中实电子科技有限责任公司 | Random arrived CMTS time stamp correcting method |
Family Cites Families (1)
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| CN1630991A (en) * | 2001-04-03 | 2005-06-22 | 汤姆森许可公司 | Time synchronization for data over a powerline modem network |
| CN101043604A (en) * | 2005-11-30 | 2007-09-26 | Lg电子株式会社 | Cable broadcasting receiver and method for controlling power supply |
| CN101388750B (en) * | 2008-10-31 | 2012-07-04 | 北京九方中实电子科技有限责任公司 | Random arrived CMTS time stamp correcting method |
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