CN107222274B - Delay detection method and system - Google Patents
Delay detection method and system Download PDFInfo
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- CN107222274B CN107222274B CN201710560547.0A CN201710560547A CN107222274B CN 107222274 B CN107222274 B CN 107222274B CN 201710560547 A CN201710560547 A CN 201710560547A CN 107222274 B CN107222274 B CN 107222274B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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Abstract
The embodiment of the invention provides a time delay detection method and a time delay detection system. In one embodiment, the delay detection method includes: the signal sending end tests signals and sends the test signals to the data forwarding ends; after receiving the test signals, the data forwarding ends process the test signals and send the processed test signals to the receiving equipment; the receiving equipment compares the time of the received test signal with a local clock of the receiving equipment to obtain the absolute time of each data forwarding end; and the receiving equipment calculates the relative time delay among different data forwarding ends according to the absolute time of each data forwarding end.
Description
Technical Field
The invention relates to the field of network data processing, in particular to a delay detection method and a delay detection system.
Background
When a digital television or audio broadcast establishes a single frequency network for transmission, different transmitters are required to transmit the same program content at the same time and the same frequency, so that reliable coverage of a certain area is realized and mutual interference is avoided. However, terminals with intermediate retransmission of signals transmitted by different transmitters may have different delays, and therefore, the relative delays of the terminals with different intermediate retransmission must be calculated before broadcasting the transmitted signals to adjust according to the relative delays. However, it is common to calculate the relative delay between two intermediately forwarded terminals by calculating the relative delay of the signals transmitted by the two intermediately forwarded terminals to reach this point to within a certain guard interval. Therefore, a method for calculating the relative delay of the terminals with different intermediate forwarding more effectively is needed.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a method and a system for detecting a delay.
The embodiment of the invention provides a delay detection method, which is applied to a delay detection system, wherein the system comprises a signal sending end, a plurality of data forwarding ends and a receiving device, and the delay detection method comprises the following steps:
the signal sending end sends a test signal to the plurality of data forwarding ends;
after receiving the test signals, the data forwarding ends process the test signals and send the processed test signals to the receiving equipment;
the receiving equipment compares the time of the received test signal with a local clock of the receiving equipment to obtain the absolute time of each data forwarding end; and
and the receiving equipment calculates the relative time delay among different data forwarding ends according to the absolute time of each data forwarding end.
The embodiment of the invention also provides a delay detection system, which comprises a signal sending end, a plurality of data forwarding ends and a receiving device;
the signal sending terminal is used for sending a test signal to the plurality of data forwarding terminals;
the data forwarding end is used for processing the test signal after receiving the test signal and sending the processed test signal to the receiving equipment;
the receiving equipment is used for comparing a clock signal in the received test signal with a local clock of the receiving equipment to calculate the absolute time of each data forwarding end; and
and the receiving equipment is used for calculating the relative time delay between different data forwarding ends according to the absolute time of each data forwarding end.
Compared with the prior art, the delay detection method and the delay detection system respectively calculate the absolute time of sending different data forwarding ends to the target area, and then calculate the relative delay between the different data forwarding ends through the absolute time. By the method, the time for the two data forwarding ends to generate signals to the target position is not limited relatively when the two data forwarding ends are calculated, and the efficiency of calculating the relative delay is improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram illustrating interaction among devices in a delay detection system according to a preferred embodiment of the present invention.
Fig. 2 is a block diagram of a receiving device according to a preferred embodiment of the present invention.
Fig. 3 is a flowchart of a delay detection method according to a preferred embodiment of the present invention.
Fig. 4 is a schematic test flow chart of the delay detection method according to the preferred embodiment of the invention.
Fig. 5 is a flowchart of a delay detection method according to another preferred embodiment of the present invention.
Fig. 6 is a detailed flowchart of step S204 of the delay detection method according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, fig. 1 is a schematic diagram illustrating interaction among devices in a delay detection system according to a preferred embodiment of the present invention. The system comprises a signal transmitting end 100, a plurality of data forwarding ends 200 and a receiving device 300. The signal transmitting end 100 is communicatively connected to one or more data forwarding ends 200 (two are shown) through a network to perform data communication or interaction. The signal transmitting end 100 may be any device having a GPS module, for example, a single frequency network adapter. The data forwarding terminal 200 may be a site such as a base station, a signal tower, or a device carrying an exciter. The receiving device 300 may be any device with a GPS module, such as a personal computer, a digital television, etc.
Fig. 2 is a block diagram of the receiving device 300. The receiving apparatus 300 includes a data processing device 310, a memory 311, a memory controller 312, a processor 313, a peripheral interface 314, an input output unit 315, a display unit 316, and a GPS module 317.
The memory 311, the memory controller 312, the processor 313, the peripheral interface 314, the input/output unit 315 and the display unit 316 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The data processing device 310 includes at least one software function module which can be stored in the memory 311 in the form of software or firmware (firmware) or is fixed in an Operating System (OS) of the receiving apparatus 300. The processor 313 is configured to execute executable modules stored in the memory, for example, software functional modules or computer programs included in the data processing apparatus 310.
The Memory 311 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 311 is used for storing a program, and the processor 313 executes the program after receiving an execution instruction, and the method executed by the receiving apparatus 300 defined by the process disclosed in any embodiment of the present invention may be applied to the processor 313, or implemented by the processor 313.
The processor 313 may be an integrated circuit chip having signal processing capabilities. The Processor 313 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 314 couples various input/output devices to the processor 313 and to the memory 311. In some embodiments, peripheral interface 314, processor 313, and memory controller 312 may be implemented in a single chip. In other examples, they may be implemented separately from the individual chips.
The input/output unit 315 is used for providing input data for a user. The input/output unit 315 may be, but is not limited to, a mouse, a keyboard, and the like.
The display unit 316 provides an interactive interface (e.g., a user interface) between the receiving device 300 and a user or for displaying image data to a user reference. In this embodiment, the display unit may be a liquid crystal display or a touch display. In the case of a touch display, the display can be a capacitive touch screen or a resistive touch screen, which supports single-point and multi-point touch operations. In this embodiment, the display unit 316 may be configured to display the relative delay between different data forwarding terminals 200 calculated by the receiving device 300 according to the received signal.
The GPS module 317 is configured to receive a positioning signal broadcast by a GPS satellite, and calculate a position of the GPS module according to the positioning signal. The location may be represented by, for example, longitude, latitude, and altitude. It will be appreciated that the manner in which positioning is achieved is not limited to a GPS system. For example, other available Satellite positioning systems include the Beidou Satellite positioning System (CNSS) or the Global Navigation Satellite System (GLONASS). Furthermore, positioning is not limited to using satellite positioning technology, for example, wireless positioning technology, such as wireless base station-based positioning technology or wireless hotspot positioning technology, may also be used. At this time, the GPS module 317 may be replaced with a corresponding module or implemented directly via the processor 313 to execute a specific positioning program. In this embodiment, the GPS module is configured to compare the received signals with time to obtain the time of the signals in the transmission path and the time of the signals processed in one or more terminals in the middle.
Please refer to fig. 3, which is a flowchart illustrating a delay detection method applied to the delay detection system shown in fig. 1 according to a preferred embodiment of the present invention. The specific flow shown in fig. 3 will be described in detail below.
Step S201, the signal sending end sends a test signal to a plurality of the data forwarding ends.
In this embodiment, the test signal includes a Second Frame initialization packet (SIP for short). And the data forwarding end sends the 1PPS pulse rising edge of each GPS in the second frame initialization packet once.
Step S202, after receiving the test signal, the data forwarding terminals process the test signal, and send the processed test signal to the receiving device.
Step S203, the receiving device compares the time of the received test signal with a local clock of the receiving device to obtain the absolute time of each data forwarding end.
In this embodiment, step S203 includes: and the receiving equipment calculates the time difference between the pulse rising edge in the second frame initialization packet in the received test signal and the pulse rising edge of the local clock to obtain the absolute time.
The second frame initialization packet has a fixed delay relative to the 1PPS pulse rising edge of GPS. The delay includes a transmission time of the second frame initialization packet and a processing time in the data forwarding end.
The flow of time for the test signal to reach the receiving device is described below in one example. As shown in fig. 4, a time axis t is included in the diagram, where the time axis t includes: the signal transmission time t0 (where t0 also indicates the rising edge time of the first 1PPS pulse), the signal reception time t1, and the rising edge time t2 of the second 1PPS pulse. The time difference between the rising edge time of the first 1PPS pulse and the rising edge time t2 of the second 1PPS pulse is one second. In this example, the time period t0-t1 represents the time it takes for the test signal to reach the receiving device. In one example, the time required for the test signal to be transmitted from the signal transmitting terminal to the data forwarding terminal is T0, the time required for the data forwarding terminal to process the received test signal is T1, the time required for the test signal to be transmitted from the data forwarding terminal to the receiving device is T2, and the time required for the test signal to reach the receiving device from the signal transmitting terminal is T3. Wherein, T3 may represent the absolute time when the test signal corresponds to a data forwarding end. T3 may be calculated from the signal transmission time T0 (where T0 also represents the rising edge time of the first 1PPS pulse), the signal reception time T1, and the rising edge time T2 of the second 1PPS pulse.
Step S204, the receiving device calculates the relative time delay between different data forwarding ends according to the absolute time of each data forwarding end.
In this embodiment, the relative delay may be calculated according to the absolute time corresponding to different data forwarding terminals. In one example, the relative delay between the data forwarding end a and the data forwarding end B needs to be calculated, and the absolute time of the data forwarding end a is T31The absolute time of the data forwarding end B is T32Then the relative delay of the data forwarding end A and the data forwarding end B is | T31-T32L. According to the method for testing the relative delay in the embodiment, the relative delay is directly calculated according to the absolute time of the data sending end, the distance between the signal sending end and the receiving equipment does not need to be tested, and the calculation is also convenient and simple.
In other embodiments, as shown in fig. 5, before step S203, the method further comprises:
step S301, the receiving device corrects the local clock by a pulse per second signal of the GPS.
The step of comparing, by the receiving device, the time of the received test signal with a local clock of the receiving device to obtain an absolute time of each data forwarding end includes:
and the receiving equipment calculates the absolute time of each data forwarding end by using the clock signal in the received test signal and the local clock corrected by the receiving equipment. The local clock is corrected according to the pulse per second signal of the GPS, so that the rising edge of the clock signal corresponding to the local clock can correspond to the sending time corresponding to the second frame initialization packet, and the calculated absolute time is more accurate.
In this embodiment, the test signal is sent by the signal sending end at the rising edge of the 1PPS pulse of the GPS.
Referring again to fig. 4, the signal transmission time t0 may be calculated according to the rising edge time t2 of the second 1PPS pulse. The second preceding the rising edge time t2 of the second 1PPS pulse is the signaling time t 0. And then the absolute time T3 of the test signal passing through the data forwarding end can be calculated according to the signal receiving time T1 and the signal sending time T0 when the receiving equipment receives the test signal.
In one embodiment, as shown in fig. 6, step S204 includes step S2041, step S2042, and step S2043, which will be described in detail below.
Step S2041, obtaining a first transmission time of the test signal from the signal sending end to the data forwarding end, and obtaining a second transmission time of the test signal from the data forwarding end to the receiving device.
In this embodiment, referring to the example shown in fig. 4, the first transmission time may be represented by T0 in fig. 4, and the second transmission time may be represented by T2 in fig. 4. When the transmission route and the transmission equipment are determined, the time spent by the transmission route and the transmission equipment for transmitting data is determined, so that the first transmission time and the second transmission time are fixed values.
Step S2042, calculating the processing time for the data forwarding end to process the data according to the absolute time, the first transmission time, and the second transmission time.
The processing time is the absolute time minus the first transmission time and the second transmission time. Taking the example shown in fig. 4 as an example, the processing time T1 is T3-T0-T1.
And step S2043, calculating the relative time delay of different data forwarding ends according to the processing time.
In this embodiment, the absolute time of the data forwarding end in a new transmission route is calculated, and the absolute time can be calculated according to the transmission time required by the new transmission route and the processing time. Further, the relative delay can be calculated according to the absolute time of different data forwarding ends.
According to the delay detection method in the embodiment, the absolute time for sending different data forwarding ends to a target area is calculated respectively, and then the relative delay between different data forwarding ends is calculated according to the absolute time. By the method, the time for the two data forwarding ends to generate signals to the target position is not limited relatively when the two data forwarding ends are calculated, and the efficiency of calculating the relative delay is improved.
The embodiment of the invention also provides a delay detection system, which comprises a signal sending end, a plurality of data forwarding ends and a receiving device. Each device in the system in this embodiment is configured to perform each step in the above-described method embodiment.
The signal sending terminal is used for sending a test signal to the plurality of data forwarding terminals.
In this embodiment, the test signal includes a second frame initialization packet.
And the data forwarding end is used for processing the test signal after receiving the test signal and sending the processed test signal to the receiving equipment.
The receiving device is used for comparing a clock signal in the received test signal with a local clock of the receiving device to calculate the absolute time of each data forwarding end.
And the receiving equipment is used for calculating the relative time delay between different data forwarding ends according to the absolute time of each data forwarding end.
The receiving device comprises a GPS module and is further used for correcting the local clock through a pulse per second signal of the GPS, and the receiving device calculates the absolute time of each data forwarding end through the clock signal in the received test signal and the local clock corrected by the receiving device.
In this embodiment, the receiving device is further configured to calculate a time difference between a pulse rising edge in the second frame initialization packet in the received test signal and a pulse rising edge of the local clock, so as to obtain the absolute time.
In this embodiment, the receiving device is further configured to obtain a first transmission time when the test signal arrives at the data forwarding end from the signal sending end, obtain a second transmission time when the test signal arrives at the receiving device from the data forwarding end, calculate a processing time for processing data by the data forwarding end according to the absolute time, the first transmission time, and the second transmission time, and calculate relative delays of different data forwarding ends according to the processing time.
For other details of the present embodiment, reference may be further made to the description of the above method embodiment, which is not repeated herein.
According to the delay detection system in the embodiment, the absolute time for sending different data forwarding ends to the target area is calculated respectively, and then the relative delay between different data forwarding ends is calculated according to the absolute time. By the method, the time for the two data forwarding ends to generate signals to the target position is not limited relatively when the two data forwarding ends are calculated, and the efficiency of calculating the relative delay is improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A delay detection method is characterized in that the method is applied to a delay detection system, the system comprises a signal sending end, a plurality of data forwarding ends and a receiving device, and the delay detection method comprises the following steps:
the signal sending end sends a test signal to the plurality of data forwarding ends, wherein the test signal comprises a second frame initialization packet;
after receiving the test signals, the data forwarding ends process the test signals and send the processed test signals to the receiving equipment;
the receiving equipment compares the time of the received test signal with a local clock of the receiving equipment to obtain the absolute time of each data forwarding end; and
the receiving equipment calculates the relative time delay among different data forwarding ends according to the absolute time of each data forwarding end;
wherein the step of the receiving device comparing the time of the received test signal with the local clock of the receiving device to obtain the absolute time of each data forwarding end comprises:
and the receiving equipment calculates the absolute time according to the time of the second frame initialization packet of the received test signal and the time of the pulse rising edge of the local clock.
2. The delay detection method of claim 1, wherein the receiving device comprises a GPS module, and prior to the step of the receiving device comparing the time of the received test signal to a local clock of the receiving device to obtain the absolute time of each data forwarding end, the method further comprises:
the receiving equipment corrects the local clock through a pulse per second signal of a GPS;
the step of comparing, by the receiving device, the time of the received test signal with a local clock of the receiving device to obtain an absolute time of each data forwarding end includes:
and the receiving equipment calculates the absolute time of each data forwarding end by using the clock signal in the received test signal and the local clock corrected by the receiving equipment.
3. The delay detection method of claim 1 or 2, wherein the step of the receiving device calculating the relative delay between different data forwarding terminals according to the absolute time of each data forwarding terminal comprises:
acquiring first transmission time of the test signal from a signal sending end to the data forwarding end and acquiring second transmission time of the test signal from the data forwarding end to the receiving device;
calculating the processing time of the data forwarding end for processing the data according to the absolute time, the first transmission time and the second transmission time;
and calculating the relative time delay of different data forwarding ends according to the processing time.
4. A time delay detection system is characterized in that the system comprises a signal sending end, a plurality of data forwarding ends and a receiving device;
the signal sending end is used for sending a test signal to the plurality of data forwarding ends, and the test signal comprises a second frame initialization packet;
the data forwarding end is used for processing the test signal after receiving the test signal and sending the processed test signal to the receiving equipment;
the receiving equipment is used for comparing a clock signal in the received test signal with a local clock of the receiving equipment to calculate the absolute time of each data forwarding end; and
the receiving equipment is used for calculating the relative time delay among different data forwarding ends according to the absolute time of each data forwarding end;
and the receiving equipment is further used for calculating the absolute time according to the time of the second frame initialization packet of the received test signal and the time of the second pulse rising edge of the local clock.
5. The delay detection system of claim 4, wherein the receiving device comprises a GPS module,
the receiving device is further configured to correct the local clock through a pulse per second signal of the GPS, and the receiving device calculates absolute time of each data forwarding end from a clock signal in the received test signal and the local clock corrected by the receiving device.
6. The delay detection system according to claim 4 or 5, wherein the receiving device is further configured to obtain a first transmission time of the test signal from the signal sending end to the data forwarding end, obtain a second transmission time of the test signal from the data forwarding end to the receiving device, calculate a processing time for processing data by the data forwarding end according to the absolute time, the first transmission time, and the second transmission time, and calculate a relative delay between different data forwarding ends according to the processing time.
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| CN111541583B (en) * | 2020-04-20 | 2022-01-04 | 杭州迪普信息技术有限公司 | System, method and device for testing fragment message cache |
| CN112843677B (en) * | 2021-02-08 | 2023-07-11 | 脸萌有限公司 | System delay determining method, device, equipment and storage medium |
| CN113115345A (en) * | 2021-04-20 | 2021-07-13 | 北京壹思达惟信息技术有限公司 | Single frequency network delay dynamic adjustment method and device |
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| CN107222274A (en) | 2017-09-29 |
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