CN113271121A - Cable transmission method, device and system - Google Patents
Cable transmission method, device and system Download PDFInfo
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- CN113271121A CN113271121A CN202110368000.7A CN202110368000A CN113271121A CN 113271121 A CN113271121 A CN 113271121A CN 202110368000 A CN202110368000 A CN 202110368000A CN 113271121 A CN113271121 A CN 113271121A
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Abstract
The present disclosure relates to the field of bidirectional broadband access to coaxial cables, and in particular provides a cable transmission method, device and system, wherein the transmission system comprises: a cable local side transmission device for synchronizing the pulse per second signal and the time of day signal; a cable terminal transmission device for synchronizing the pulse per second signal and the time of day signal; the coaxial transmission network is used for connecting the local side transmission device and the terminal transmission device and bearing the HINOC protocol frame signals; and the data transmission port of the pulse per second and the time of day is used for receiving the pulse per second and the time of day signals at the front stage in the cable local side transmission device of the synchronous pulse per second and the time of day signals and transmitting the pulse per second and the time of day signals to the small base station at the rear stage in the cable terminal transmission device of the synchronous pulse per second and the time of day signals. The method of the present disclosure helps solve the synchronization problem of the small base stations of the "coaxial access + 5G" indoor coverage.
Description
Technical Field
The present disclosure relates to the field of bidirectional broadband access to coaxial cables, and more particularly, to a cable transmission method, device, and system.
Background
The coaxial cable bidirectional broadband access technology is one of home broadband network access technologies, and compared with other access modes, the coaxial broadband access mainly utilizes the existing coaxial cable in a home to access broadband data, does not need to be wired again, and can greatly save construction and material costs while providing large bandwidth. A High Performance Network over Coax (HINOC) is the only independent industry standard for coaxial broadband access in China. Second generation HINOC industry standard (HINOC2.0) is released in 2016, a single channel analog bandwidth is 128MHz, the highest data transmission rate can reach 1Gbps, the modulation technology adopts Orthogonal Frequency Division Multiplexing (OFDM) technology, the Duplex mode adopts Time Division Duplex (TDD), and 1 local side can support 64 terminals to be simultaneously online.
The fifth generation mobile communication (5G) technology is a new generation mobile communication technology proposed for explosive mobile data traffic growth, mass device connection, various new services and application scenes which are continuously emerging, and the like, and is a new world which is 'everything interconnection' established by the technology. Hua is "indoor white paper of 5G network" and states that nearly 80% of the services in 4G network occur indoors, and the 5G indoor service percentage will be higher. However, signals of a 5G macro base station deployed in a high frequency band face a larger link loss problem when the indoor scene is covered through a wall, and the indoor deep coverage is insufficient. The small base station is a small and low-power base station device, the mass of the small base station is generally between 2 and 10kg, the power is generally 50mW to 5W, the coverage range is 10 to 200 meters, the small base station has the characteristics of good controllability, intellectualization, flexible networking and the like, supports the backhaul of various broadband technologies including DSL/optical fiber/coaxial technologies, and becomes a main deployment mode of indoor 5G coverage.
When the indoor 5G small base station is deployed, besides optical fibers, the coaxial cable is used as a more ubiquitous home channel, has huge potential communication bandwidth, massive access nodes and bus type networking, and can be fused with the 5G small base station for deployment by combining with the current domestic unique HINOC (autonomous coaxial access) standard to form low-cost and high-efficiency 5G indoor penetration coverage of coaxial cable + 5G.
Compared with 4G, 5G provides new requirements for time synchronization of the system, and the 5G network can smoothly bear a large amount of industry applications only by ensuring strict time synchronization among base stations, so that user perception is ensured. A time synchronization system is a system that can receive an external time reference signal and output a time synchronization signal and time information to the outside with a required time accuracy, and that can align and synchronize other clocks in a network. In a communication network, a time synchronization system plays an important role in the normal operation of the system. Generally, two methods are adopted for time synchronization, one is based on the 1588v2 network architecture standard of the IEEE, the other is based on a Global Navigation Satellite System (GNSS) time service synchronization mode, and the latter is mainly to arrange a special GNSS time processing module in a base station or a core node, demodulate and generate a pulse per second plus a time of day signal by receiving a time service signal of the global wechat navigation system, such as the GPS or the beidou, and use the pulse per second plus the time of day signal for the timing synchronization of the base station. According to the specification of China Mobile high-precision time synchronization pulse per second + time of day interface, the time sequence information of pulse per second + time of day is shown in FIG. 1.
For the pulse per second, a rising edge is taken as an on-time edge, the rising time is less than 50ns, and the pulse width is 20 ms-200 ms.
The time of day information is transmitted by adopting a serial port protocol, the default Baud rate is 9600, the time of day information is transmitted after the rising edge of the pulse per second is 1ms and is transmitted within 500ms, and the time of day information marks the rising edge time triggered by the current pulse per second. The time of day protocol message transmission frequency is 1 time per second.
For a 5G small base station, if general data traffic is transmitted, the timing error between the small base station and a standard clock is required to be within ± 1.5us, and if special application scenarios such as in-band carrier aggregation and multi-point coordination are required, ± 130ns is required.
For the coverage scheme of the indoor 5G small base station of "coaxial cable + 5G", because of the limitations of indoor shielding and cost, the indoor small base station usually does not carry a GNSS synchronization timing module, so that transmission can only be performed from the outside through coaxial, for example, a coaxial access system needs to support a 1588v2 protocol or support transmission of a pulse per second + time of day signal, and during transmission, a large deviation of synchronization information cannot occur due to passing through a primary coaxial transmission system, so that the indoor 5G small base station cannot obtain high-quality synchronization related information.
Disclosure of Invention
The method and the device aim to solve the technical problem that in the prior art, an indoor 5G small base station cannot obtain high-quality synchronization related information due to large deviation of synchronization information in the transmission process.
In order to achieve the above technical object, the present disclosure provides a cable local side transmission device for synchronizing a pulse per second signal and a time of day signal, including:
the local side time synchronization information processing module is used for processing the information of the pulse per second signal and the time of day signal;
and the high-performance coaxial cable access network HINOC local side protocol processing module is used for processing the HINOC local side protocol.
Further, the office time synchronization information processing module is specifically configured to:
capturing the rising edge time of the pulse per second signal, and acquiring a system clock or a periodic timing pulse of an HINOC local side;
calculating the deviation between the time of the preceding second pulse signal and the system time through comparison;
then calculating the theoretical time of the next second pulse signal arriving at the corresponding HINOC local side;
and receiving the time of day signal information through a standard universal serial interface and modifying the time of day signal information according to the actual time information.
Further, the HINOC central office protocol specifically includes:
MAC layer protocols and/or physical layer protocols.
In order to achieve the above technical object, the present disclosure can also provide a cable termination transmission device for synchronizing a pulse-per-second signal and a time-of-day signal, including:
the high-performance coaxial cable access network HINOC terminal protocol processing module is used for processing the HINOC terminal protocol;
and the terminal time synchronization information processing module is used for processing the information of the pulse per second signal and the time of day signal.
Further, the terminal time synchronization information processing module is specifically configured to:
receiving the information of the generation time and the time of day signal of the pulse per second signal sent by the central office, generating the pulse per second signal meeting the standard requirement at the time of the appointed HINOC terminal, and outputting the information of the time of day signal by using the universal serial interface after the rising edge of the pulse per second signal passes through the time of the preset threshold.
Further, the HINOC terminal protocol specifically includes:
MAC layer protocols and/or physical layer protocols.
In order to achieve the above technical object, the present disclosure can also provide a method for transmitting a synchronized pulse-per-second signal cable, which is applied to the above central office end transmission apparatus, the method including:
determining the transmission arrival time of the second pulse signal input by the local side transmission cable of the next high-performance coaxial cable access network HINOC;
time synchronization is carried out on the HINOC terminal equipment and the local terminal equipment by utilizing a sampling clock deviation correction and distance measurement mechanism of the HINOC system;
and the HINOC equipment terminal receives the rising edge time of the next pulse per second signal, generates the pulse per second signal at the moment of the rising edge time according to the standard requirement of the pulse per second signal, and outputs the pulse per second signal to a rear-stage small base station for use.
Further, the determining the transmission arrival time of the next input pulse per second signal of the high performance coaxial cable access network HINOC central office end transmission cable specifically includes:
sampling a current input pulse per second signal of the transmission cable through a high-frequency clock;
capturing the rising edge of the current input pulse per second signal of the transmission cable, determining the rising time, and recording the rising time as standard time;
comparing the standard time with the HINOC local side time, and calculating the frequency deviation between the running frequency of the HINOC local side system and the standard time;
and calculating the theoretical transmission arrival time of the next input pulse per second through the frequency deviation.
In order to achieve the above technical object, the present disclosure can also provide a method for transmitting a cable of a synchronous time of day signal, which is applied to the above central office end transmission apparatus, the method including:
receiving a time of day signal via at least one standard universal serial interface;
modifying the time information of the time-of-day signal according to the actual transmission time to obtain a modified time signal;
sending the time-of-day information of the modified time signal to the HINOC terminal through a downlink detection frame or a signaling frame;
and outputting the time-of-day information to a rear-stage small base station for use by using a universal serial interface through the time-of-day information transmitted and received by the HINOC terminal.
To achieve the above technical object, the present disclosure can also provide a HINOC-based pulse per second + time of day transmission system, the transmission system including:
the cable local side transmission device for the synchronous pulse per second signal and the time of day signal;
the cable terminal transmission device for the synchronous pulse per second signal and the time of day signal;
the coaxial transmission network is used for connecting the local side transmission device and the terminal transmission device and bearing the HINOC protocol frame signals;
a data transmission port for pulse per second and time of day for receiving a pulse per second and time of day signal at a previous stage in the synchronous pulse per second and time of day signal cable office transmission device, and,
and transmitting the pulse-per-second and time-of-day signals to a rear-stage small base station in the synchronous pulse-per-second and time-of-day signal cable terminal transmission device.
The beneficial effect of this disclosure does:
the method helps solve the synchronization problem of a small base station which is coaxially accessed and covered in a +5G room, and transmits time synchronization information of pulse per second and day time from an outdoor local side exchange node to an indoor small base station according to a certain processing flow by utilizing an HINOC protocol, so that the time synchronization among the small base station, a core node and the small base station is ensured to meet the requirement; a device and a system for transmitting a pulse per second + time of day local side and a terminal based on an HINOC specifically provide a basic constitution device and a system architecture using the method, and provide a specific implementable guidance, which comprises a basic constitution of a synchronous information processing module and a detailed processing flow of a pulse per second + time of day signal, a synchronous mechanism of the HINOC protocol processing module, a transmission mode of synchronous related information of the pulse per second + time of day, a signal interaction interface between the modules and the like, so that an indoor small base station deployment mode which is mainstream in the future of 5G can be supported by a lower price and a simpler system.
Drawings
FIG. 1 shows a diagram of pulse-per-second + time-of-day timing information;
fig. 2 shows a flow chart of a pulse-per-second signal transmission method according to embodiment 1 of the present disclosure;
fig. 3 shows a time-of-day signal transmission method flowchart of embodiment 1 of the present disclosure;
fig. 4 shows a schematic structural diagram of a cable office end transmission device for synchronous pulse-per-second signals and time-of-day signals according to embodiment 2 of the present disclosure;
fig. 5 is a schematic structural diagram illustrating a local side synchronization information processing module in a cable local side transmission device for synchronizing a pulse per second signal and a time of day signal according to embodiment 3 of the present disclosure;
fig. 6 shows a schematic structural diagram of a cable termination transmission device for synchronous pulse-per-second signals and time-of-day signals according to embodiment 4 of the present disclosure;
fig. 7 shows a schematic structural diagram of an HINOC-based pulse per second + time of day transmission system according to embodiment 5 of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
Various structural schematics according to embodiments of the present disclosure are shown in the figures. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.
The present disclosure relates to the interpretation of terms:
1 PPS: a second pulse signal;
TOD: a time of day signal.
The first embodiment is as follows:
fig. 2 shows an embodiment of the method for transmitting pulse per second signal based on HINOC, which is specifically divided into 3 steps, specifically as follows:
1) the HINOC local side samples the pulse per second signal through a high-frequency clock, determines the rising edge time of the pulse per second signal, calculates the frequency deviation between the running frequency of the HINOC local side system and the standard pulse per second signal time, and calculates the theoretical reaching time of the rising edge of the next pulse per second signal. Since there is at least one clock period deviation when the rising edge of the pulse-per-second signal is captured by sampling, the higher the sampling clock frequency, the smaller the error, and the more accurate the capturing of the rising edge of the pulse-per-second signal, for example, sampling with a 200MHz clock, the minimum error is 5ns, while using a 50MHz clock, the minimum error is 20 ns. Theoretically, the interval between the rising edges of two adjacent pulse signals per second is standard 1s time, and standard time errors caused by errors of single sampling can be reduced in a multi-time averaging mode. After the standard time is obtained, if the used high-frequency clock for sampling the second pulse signal and the HINOC local side processing clock are homologous, the HINOC local side time corresponding to the next theoretical second pulse signal rising edge time can be directly calculated, if the used high-frequency clock and the HINOC local side processing clock are different, the HINOC local side is required to give periodic timing pulses, then the same method for processing the second pulse signal is used for obtaining the deviation between the HINOC local side and the standard time, and the HINOC local side time corresponding to the first theoretical second pulse signal rising edge time is calculated.
2) The time of the HINOC terminal equipment is synchronized with the local side equipment through a sampling clock deviation correction and ranging mechanism of the HINOC, and the local side issues the next second pulse signal sending time obtained by the local side to the terminal through a periodic downlink detection frame or a control frame. The HINOC system is a TDD system, so a time synchronization mechanism of a terminal and a local side originally exists, but the HINOC system can normally work as long as a time synchronization error does not exceed the cyclic prefix protection length of the HINOC system, so the synchronization precision requirement is not high, and if the HINOC system is used for transmitting pulse per second signals, the HINOC terminal and the local side need to be ensured to have the highest synchronization precision and meet the pulse per second signal requirement. For the HINOC protocol, the sending period of the downlink detection frame is 65.536ms, the interval of the downlink control frame is about 2.5ms, and a more reliable transmission mode is adopted, so that the sending time issuing requirement of the pulse per second signal can be met.
3) And the HINOC equipment terminal receives the rising edge time of the next pulse per second signal, generates the pulse per second signal at the moment according to the standard requirement of the pulse per second signal, and outputs the pulse per second signal to a rear-stage small base station for use.
Fig. 3 shows an embodiment of the method for transmitting a time of day signal based on a HINOC, which is specifically divided into 3 steps, specifically as follows:
1) the HINOC local side equipment receives the time-of-day signal through a standard universal serial interface, and then modifies certain time information of the time-of-day signal according to actual transmission time. In the method provided by the invention, the time-of-day signal information needs to be sent from the local side to the terminal through the HINOC system, so that certain delay is inevitably generated, the time-of-day signal information corresponding to the current pulse per second signal cannot be ensured to be output in time at the terminal, and a more reliable method is to output the time-of-day signal information when the next pulse per second signal is generated, so that certain modification needs to be carried out on the time-of-day signal information, direct transparent transmission cannot be carried out, and information such as week and second in the time message information is mainly modified so as to be consistent with the actual condition output by the terminal.
2) And the HINOC central office sends the modified time of day signal information to the terminal through a downlink detection frame or control. Here, the information of all time-of-day signals in the current pulse-per-second signal period in 1) may be sent down after all the information of the time-of-day signals is received, because the information is actually used for the next pulse-per-second signal of the terminal, the delay requirement is not high, and only the transmission is completed in the current 1S period.
3) And the HINOC equipment terminal receives the time-of-day signal information transmitted by the local side, and outputs the time-of-day signal information to a rear-stage small base station by using a UART interface after generating a rising edge of a pulse per second signal for 1 ms. The terminal needs to ensure the correctness of the received time-of-day signal information, can adopt a mode of transmitting the information for a plurality of times by the local side, can also carry out information verification at the terminal, and requests to transmit the information again until the receiving is correct if the verification is incorrect.
Example two
Fig. 4 is an embodiment of a local side transmission device for pulse-per-second and time-of-day signals based on a HINOC, as shown in fig. 4, the local side transmission device mainly includes a time synchronization information processing module and a HINOC protocol processing module, where:
and the time synchronization information processing module is mainly responsible for processing the pulse per second signal and the time of day signal information.
The processing flow of the second pulse signal mainly comprises the steps of capturing the rising edge time of the second pulse signal, acquiring a system clock or a periodic timing pulse of an HINOC local side, calculating the deviation between the time of the previous second pulse signal and the system time through comparison, and then calculating the theoretical time of the next second pulse signal arriving at the corresponding HINOC local side;
the processing flow of the time of day signal mainly comprises the steps of receiving the time of day signal information through a UART interface and carrying out necessary modification on the time of day signal information according to actual time information. The calculated next pulse per second signal time and the modified time of day signal information are all sent to the HINOC protocol processing module and are sent to the terminal equipment through a downlink detection frame or a control frame.
The HINOC protocol processing module is mainly responsible for processing an HINOC local side protocol, comprises an MAC layer protocol and a physical layer protocol, and also comprises a distance measurement function of a local side and a terminal, namely the HINOC local side periodically issues a downlink detection (Pd) frame, determines the time deviation between the local side and the terminal by receiving an uplink detection (Pu) frame, and issues the time deviation to the HINOC terminal.
EXAMPLE III
Fig. 5 shows an embodiment of a local side synchronization information processing module. For different scenarios, the time synchronization information processing module and the HINOC protocol processing module in the central office transmission apparatus may be deployed in multiple ways, and this embodiment is only one of the ways of deploying the time synchronization information processing module.
If the implementation is completely redesigned, the two modules can be directly fused together to form a chip or FPGA prototype, the implementation is simple, the two modules can use clocks of the same source, the calculation of the deviation between the second pulse signal and the time of the HINOC local side is simpler, the calculation can be directly obtained according to the counting between the rising edges of the two second pulse signals, and the period fixed pulse provided by the HINOC protocol processing module is not needed.
If the implementation of the HINOC protocol processing module is completed, for example, a chip is formed, a synchronization information processing module needs to be added subsequently, and may be implemented by using a single FPGA, a CPLD, or a Microcontroller (MCU), which is the case in the embodiment of the local side synchronization information processing module shown in fig. 5. In the embodiment, the method mainly comprises a pulse per second signal processing logic and a time of day signal processing logic, wherein a rising edge capture 1 module is mainly used for capturing the rising edge of a pulse per second signal module under a high-frequency clock, a counter 1 starts to count again after the rising edge is captured until the next rising edge of the pulse per second signal comes, a count CNT1 corresponding to the standard 1s time can be obtained, and similarly, a rising edge capture 2 module and a counter 2 module count periodic timing pulses given by a HINOC local side to obtain a period count CNT2, and the deviation between the HINOC local side time and the standard time of the pulse per second signal can be calculated. The period of the periodic timing pulse is not required to be 1s, and may be, for example, a Pd frame period of the HINOC, or the like, which is provided by a convenient HINOC protocol processing module. The time of day signal information is received through a UART RX interface in the synchronous information processing module, the baud rate is 9600, and the time of day signal information is correspondingly modified after being received, mainly the time information is modified. The modified time of day signal information and the calculated time deviation information are sent to the HINOC protocol processing module through an information sending interface, wherein the information sending interface can be a UART (universal asynchronous receiver/transmitter) protocol interface, an SPI (serial peripheral interface), a GPIO (general purpose input/output) interface and the like. The high-frequency clock can also be provided for the HINOC protocol processing module or provided by an external crystal oscillator, if the HINOC protocol processing module is provided with the same source clock, the HINOC protocol processing module is not required to provide periodic timing pulses, and similarly, the higher the clock frequency is, the smaller the error of the calculated time deviation is.
Example four
Fig. 6 is an embodiment of a terminal transmission device for pulse-per-second and time-of-day signals based on a HINOC, which mainly includes a HINOC terminal protocol processing module and a terminal time synchronization information processing module, specifically:
the HINOC terminal protocol processing module is mainly responsible for processing HINOC terminal protocols, comprises an MAC layer protocol and a physical layer protocol, and also comprises a time synchronization function of a local side and a terminal, wherein the time synchronization function is mainly divided into processing clock deviation of the terminal and the local side and path delay of coaxial signal transmission.
The clock deviation is estimated mainly through a sampling clock deviation estimation module of the terminal through the phase of a downlink Pd frame or a Cd frame, and then the time of the HINOC terminal is tracked and adjusted. For example, if the difference between the HINOC terminal clock and the HINOC local side clock is estimated to be 1ppm, the local time counting module in the HINOC terminal module is full of 10 counts every time6And secondly, the counting number 1 needs to be adjusted, and the larger the clock deviation is, the faster the adjustment is, so that the time and the local side synchronization of the terminal are ensured.
The path delay is completed through a ranging function in an HINOC protocol, an HINOC terminal adjusts the time count of the HINOC terminal at one time according to the distance measured by a local side, the transmission delay is basically determined after the network topology is determined, and in order to improve the ranging accuracy, a mode of averaging multiple ranging values can be adopted to reduce errors.
The terminal time synchronization information processing module is also mainly responsible for processing the information of the pulse-per-second signal and the time-of-day signal, and similarly, according to an actual deployment scenario, the module may be deployed together with the HINOC terminal protocol processing module, or may be deployed separately outside the HINOC chip or module, where in the embodiment of fig. 6, the module is deployed separately, and at this time:
after the HINOC terminal receives the second pulse signal generation time sent by the local side, the HINOC terminal generates timing pulse at the appointed HINOC terminal time and sends the timing pulse to the synchronous information processing module, the synchronous information processing module captures the rising edge of the timing pulse by using a high-frequency clock, and then the HINOC terminal generates the second pulse signal which meets the standard requirement and is used by a rear-stage small base station.
The HINOC terminal receives the time-of-day signal information sent by the local side and then transmits the time-of-day signal information to the synchronous information processing module through an information transmission line, such as a UART interface, an SPI interface and the like. And after receiving the time of day signal information, the synchronous information processing module waits for 1ms after the second pulse signal is sent, and starts to send the time of day signal information according to the standard requirement and sends the time of day signal information to the next-stage small base station for use.
EXAMPLE five
Fig. 7 is an embodiment of a HINOC-based pulse-per-second and time-of-day signal transmission system, which mainly includes:
the local side transmission device for the second pulse signal and the time of day signal based on the HINOC is mainly responsible for local side HINOC protocol processing and second pulse signal and time of day signal information processing, captures the rising edge of the second pulse signal of the front stage, compares the rising edge with the time of the HINOC local side, calculates errors and the theoretical time of the next second pulse signal generation, simultaneously receives and modifies the time of day signal, and relevant information is issued to the HINOC terminal through the HINOC protocol.
The second pulse signal and time of day signal terminal transmission device based on the HINOC is mainly responsible for terminal HINOC protocol processing, time synchronization of a terminal and a local side and information processing of the second pulse signal and the time of day signal, and outputs the second pulse signal information and the time of day signal information according to the standard requirement.
The coaxial transmission network is used for connecting the local side and the terminal transmission device and bearing the HINOC protocol frame signals, the coaxial transmission network is usually a tree network, a plurality of terminals can be connected under 1 local side, the time of all terminal equipment needs to be synchronized with the local side, and the pulse per second signals generated by all corresponding terminals are basically synchronized.
The data transmission ports of the pulse-per-second signal and the time-of-day signal are used for receiving the pulse-per-second signal and the time-of-day signal at the front stage at the local side, and the terminal is responsible for transmitting the pulse-per-second signal and the time-of-day signal to the small base station at the rear stage.
The embodiments of the present disclosure have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A cable local side transmission device for synchronizing pulse-per-second signals and time-of-day signals, comprising:
the local side time synchronization information processing module is used for processing the information of the pulse per second signal and the time of day signal;
and the high-performance coaxial cable access network HINOC local side protocol processing module is used for processing the HINOC local side protocol.
2. The apparatus according to claim 1, wherein the office-side time synchronization information processing module is specifically configured to:
capturing the rising edge time of the pulse per second signal, and acquiring a system clock or a periodic timing pulse of an HINOC local side;
calculating the deviation between the time of the preceding second pulse signal and the system time through comparison;
then calculating the theoretical time of the next second pulse signal arriving at the corresponding HINOC local side;
and receiving the time of day signal information through a standard universal serial interface and modifying the time of day signal information according to the actual time information.
3. The apparatus according to any of claims 1 or 2, wherein the HINOC office side protocol comprises in particular:
MAC layer protocols and/or physical layer protocols.
4. A cable termination transmission device for synchronizing a pulse-per-second signal and a time-of-day signal, comprising:
the high-performance coaxial cable access network HINOC terminal protocol processing module is used for processing the HINOC terminal protocol;
and the terminal time synchronization information processing module is used for processing the information of the pulse per second signal and the time of day signal.
5. The apparatus according to claim 4, wherein the terminal time synchronization information processing module is specifically configured to:
receiving the information of the time and the time of day signals generated after the second pulse is absorbed and transmitted by a central office, generating the second pulse signals meeting the standard requirements at the time of the appointed HINOC terminal, and outputting the information of the time of day signals by using a universal serial interface after the rising edge of the second pulse signals passes through the time of a preset threshold.
6. The apparatus according to any of claims 4 or 5, wherein the HINOC termination protocol comprises in particular:
MAC layer protocols and/or physical layer protocols.
7. A synchronized pulse-per-second signal cable transmission method applied to the office transmission apparatus according to any one of claims 1 to 3, the method comprising:
determining the transmission arrival time of the next input pulse per second signal of a high-performance coaxial cable access network HINOC local side transmission cable;
time synchronization is carried out on the HINOC terminal equipment and the local terminal equipment by utilizing a sampling clock deviation correction and distance measurement mechanism of the HINOC system;
and the HINOC equipment terminal receives the rising edge time of the next pulse per second signal, generates the pulse per second signal at the moment of the rising edge time according to the standard requirement of the pulse per second signal, and outputs the pulse per second signal to a rear-stage small base station for use.
8. The method of claim 7, wherein the determining a transmission arrival time of a next incoming pulse-per-second signal on a high performance coax access network HINOC local side transmission cable comprises:
sampling a current input pulse per second signal of the transmission cable through a high-frequency clock;
capturing the rising edge of the second pulse signal input by the transmission cable, determining the rising time, and recording the rising time as standard time;
comparing the standard time with the HINOC local side time, and calculating the frequency deviation between the running frequency of the HINOC local side system and the standard time;
and calculating the theoretical transmission arrival time of the next input pulse per second through the frequency deviation.
9. A cable transmission method of a synchronous time-of-day signal, applied to the office transmission apparatus as claimed in any one of claims 1 to 3, the method comprising:
receiving a time of day signal via at least one standard universal serial interface;
modifying the time information of the time-of-day signal according to the actual transmission time to obtain a modified time signal;
sending the time-of-day information of the modified time signal to the HINOC terminal through a downlink detection frame or a signaling frame;
and outputting the time-of-day information to a rear-stage small base station for use by using a universal serial interface through the time-of-day information transmitted and received by the HINOC terminal.
10. A HINOC-based pulse-per-second + time-of-day transmission system, the transmission system comprising:
the cable office transmission apparatus for synchronous PPS and a time-of-day signal according to any one of claims 1 to 3;
the cable termination transmission device for synchronous PPS signals and time-of-day signals according to any one of claims 4 to 6;
the coaxial transmission network is used for connecting the local side transmission device and the terminal transmission device and bearing the HINOC protocol frame signals;
a data transmission port for pulse per second and time of day for receiving a pulse per second and time of day signal at a previous stage in the synchronous pulse per second and time of day signal cable office transmission device, and,
and transmitting the pulse-per-second and time-of-day signals to a rear-stage small base station in the synchronous pulse-per-second and time-of-day signal cable terminal transmission device.
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