CN116455497B - Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium - Google Patents

Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium Download PDF

Info

Publication number
CN116455497B
CN116455497B CN202310037683.7A CN202310037683A CN116455497B CN 116455497 B CN116455497 B CN 116455497B CN 202310037683 A CN202310037683 A CN 202310037683A CN 116455497 B CN116455497 B CN 116455497B
Authority
CN
China
Prior art keywords
base station
network
mobile communication
communication network
data packet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202310037683.7A
Other languages
Chinese (zh)
Other versions
CN116455497A (en
Inventor
张桢睿
张伟杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Bibo Semiconductor Co ltd
Original Assignee
Hangzhou Bibo Semiconductor Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Bibo Semiconductor Co ltd filed Critical Hangzhou Bibo Semiconductor Co ltd
Priority to CN202310037683.7A priority Critical patent/CN116455497B/en
Publication of CN116455497A publication Critical patent/CN116455497A/en
Application granted granted Critical
Publication of CN116455497B publication Critical patent/CN116455497B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/005—Moving wireless networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application provides a timing synchronization method of a mobile communication network and a television broadcast network and related equipment; the method comprises the following steps: setting a preset mobile communication network as a node of a preset television broadcasting network, and constructing a topology network for interconnecting the mobile communication network and the television broadcasting network by utilizing a preset broadcasting multicast service center; the broadcast multicast service center appoints the base station broadcasting time of each base station according to the time delay when broadcasting the preset data packet to each base station in the mobile communication network, and corrects the time stamp in the data packet according to the base station broadcasting time; when any preset terminal transmitting data packets with any base station in the mobile communication network moves, the terminal corrects the current time stamp in the data packets according to the timing of the clock of the base station; when the terminal switches the base stations, the terminal is enabled to correct the current time stamp in the data packet according to the timing deviation of the clocks between the two base stations.

Description

Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium
Technical Field
The embodiment of the application relates to the technical field of digital television broadcasting, in particular to a timing synchronization method and related equipment of a mobile communication network and a television broadcasting network.
Background
In the related synchronization mode, since the mobile receiving terminal in the mobile communication network may switch between different base stations, the network topology changes, and the transmission path from the television broadcasting network to the terminal changes, so the transmission delay of the data from the television broadcasting network to the terminal changes, and the data buffer area of the terminal is further caused to overflow, and the audio and video cannot be normally played.
Based on this, a scheme is needed that can eliminate the error of the transmission delay and keep the transmission delay constant.
Disclosure of Invention
In view of the foregoing, an object of the present application is to provide a timing synchronization method and related apparatus for a mobile communication network and a television broadcast network.
Based on the above objects, the present application provides a timing synchronization method for a mobile communication network and a television broadcast network, including:
setting a preset mobile communication network as a node of a preset television broadcasting network, and constructing a topology network for interconnecting the mobile communication network and the television broadcasting network by utilizing a preset broadcasting multicast service center;
the broadcast multicast service center appoints the base station broadcasting time of each base station according to the delay when broadcasting the preset data packet to each base station in the mobile communication network, and corrects the time stamp in the data packet according to the base station broadcasting time;
responding to movement of any preset terminal transmitting the data packet with any base station in the mobile communication network, and enabling the terminal to correct the current time stamp in the data packet according to the timing of the clock of the base station;
and switching transmission with the base station to transmission with any other base station except the base station in response to the terminal, so that the terminal corrects the current time stamp in the data packet according to the timing deviation of clocks between the two base stations.
Further, after constructing a topology network for interconnecting the mobile communication network and the television broadcast network, the method further includes:
setting the same reference time point for the television broadcasting network and the mobile communication network in the topology network;
and determining a numerical conversion relation between the time stamp of the television broadcasting network and the time stamp of the mobile communication network at the reference time point according to the proportional relation between the clock of the television broadcasting network and the clock of the mobile communication network on the timing frequency.
Further, after constructing a topology network for interconnecting the mobile communication network and the television broadcast network, the method further includes:
and responding to the broadcast multicast service center to receive the transport stream input by the television broadcast network, and enabling the broadcast multicast service center to encapsulate the transport stream with a user datagram protocol and broadcast the transport stream to the mobile communication network.
Further, the broadcast multicast service center is configured to designate a base station broadcast time of each base station according to a delay when broadcasting a preset data packet to each base station in the mobile communication network, including:
determining the maximum delay when the broadcast multicast service center broadcasts data packets to each base station respectively;
and determining the central broadcasting time when the broadcast multicast service center broadcasts the data packet to any base station, and designating the base station broadcasting time which is larger than the sum of the maximum delay and the central broadcasting time for each base station.
Further, after correcting the time stamp in the data packet according to the broadcast time of the base station, the method further comprises:
determining the minimum delay when the broadcast multicast service center broadcasts data packets to each base station respectively, and determining the difference between the minimum delay and the maximum delay;
determining a preset rate when the base station broadcasts the data packet and processing delay of the data packet processed in the base station;
and for any base station, determining the buffer area size when the base station broadcasts by using the processing delay and the difference value at the speed.
Further, the method for correcting the current time stamp in the data packet by the terminal according to the timing of the clock of the base station includes:
the terminal performs time offset tracking by utilizing a reference signal sent by the base station, and determines a first time offset of each subframe in each channel frame received by the terminal;
accumulating the first time offset of each subframe to obtain a movement error of the current time stamp in the data packet;
and correcting the current time stamp by using the movement error of the current time stamp to obtain a corrected time stamp.
Further, the method for enabling the terminal to correct the current time stamp in the data packet according to the timing deviation of the clocks between the two base stations includes:
the terminal performs time offset tracking by utilizing the reference signals sent by the two base stations respectively, and the timing deviation between the two base stations is estimated;
determining the switching error of the current time stamp in the data packet according to the timing deviation;
and correcting the current time stamp by utilizing the switching error of the current time stamp to obtain a corrected time stamp.
Based on the same inventive concept, the present application also provides a timing synchronization device of a mobile communication network and a television broadcast network, including: the system comprises a topology network construction module, a first timestamp correction module, a second timestamp correction module and a third timestamp correction module;
the topology network construction module is configured to set a preset mobile communication network as a node of a preset television broadcasting network, and construct a topology network for interconnecting the mobile communication network and the television broadcasting network by utilizing a preset broadcasting multicast service center;
the first timestamp correction module is configured to enable the broadcast multicast service center to specify the base station broadcast time of each base station according to the delay when a preset data packet is broadcast to each base station in the mobile communication network, and correct the timestamp in the data packet according to the base station broadcast time;
the second timestamp correction module is configured to respond to movement of any preset terminal transmitting the data packet with any base station in the mobile communication network, so that the terminal corrects the current timestamp in the data packet according to the timing of the clock of the base station;
the third timestamp correction module is configured to switch transmission with the base station to any one of the other base stations except the base station in response to the transmission with the base station by the terminal, so that the terminal corrects the current timestamp in the data packet according to the timing deviation of clocks between the two base stations.
Based on the same inventive concept, the application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the timing synchronization method of the mobile communication network and the television broadcast network according to any one of the above when executing the program.
Based on the same inventive concept, the present application also provides a non-transitory computer readable storage medium, wherein the non-transitory computer readable storage medium stores computer instructions for causing the computer to perform a timing synchronization method of a mobile communication network and a television broadcast network as described above.
From the above, it can be seen that the timing synchronization method and related device for a mobile communication network and a television broadcast network provided by the present application specify a base station broadcast time and correct a time stamp based on a topology network constructed by using a broadcast multicast service center for interconnecting the mobile communication network and the television broadcast network, comprehensively considering delay when the broadcast multicast service center transmits to each base station.
Further, when the terminal moves, the method also determines the error of the time stamp according to the timing of the clock of the base station, so as to correct the time stamp, and when the terminal switches the base station, the error of the time stamp of the terminal is determined according to the error of the clock between the two base stations, so that the time stamp at the moment is corrected, and the condition of delay jitter is eliminated.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a flowchart of a timing synchronization method of a mobile communication network and a television broadcast network according to an embodiment of the present application;
fig. 2 is a topological network diagram of the interconnection of the mobile communication network and the television broadcast network according to the embodiment of the present application;
FIG. 3 is a first graph of clock counts according to an embodiment of the present application;
FIG. 4 is a second graph of clock counts according to an embodiment of the present application;
fig. 5 is a schematic diagram of a timing synchronization device of a mobile communication network and a television broadcast network according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given a general meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in the embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As described in the background section, the related timing synchronization method between the mobile communication network and the television broadcast network is also difficult to meet the actual needs of television broadcast.
The applicant finds that in the process of implementing the present application, the main problems of the timing synchronization method of the related mobile communication network and television broadcast network are: in the related synchronization mode, since the mobile receiving terminal in the mobile communication network may switch between different base stations, the network topology changes, and the transmission path from the television broadcasting network to the terminal changes, so the transmission delay of the data from the television broadcasting network to the terminal changes, and the data buffer area of the terminal is further caused to overflow, and the audio and video cannot be normally played.
Based on this, one or more embodiments in the present application provide a timing synchronization method of a mobile communication network and a television broadcast network, which synchronizes the mobile communication network and the television broadcast network based on correction of a time stamp in a transport stream.
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
In the embodiment of the present application, the digital television broadcasting network, which is also referred to as a television broadcasting network, may be any one of television broadcasting networks including DVB-C (cable television broadcasting), DVB-S (satellite television broadcasting), and DVB-T (terrestrial television broadcasting).
Further, in the mobile communication network, a base station and a mobile terminal are included.
Referring to fig. 1, a timing synchronization method of a mobile communication network and a television broadcast network according to an embodiment of the present application includes the following steps:
step S101, setting a preset mobile communication network as a node of a preset television broadcasting network, and constructing a topology network for interconnecting the mobile communication network and the television broadcasting network by utilizing a preset broadcasting multicast service center.
In the embodiment of the present application, based on a preset mobile communication network and a preset television broadcast network, the mobile communication network and the television broadcast network may be interconnected using a preset BM-SC (broadcast multicast service center) and a topology network for transmitting audio and video data from the television broadcast network to the mobile communication network may be formed.
Specifically, in constructing the topology network, as shown in fig. 2, the television broadcasting network may use the entire mobile communication network as an intermediate node and implement transmission of a transport stream to the mobile communication network through the BM-SC.
The television broadcast network may encapsulate a transport stream of audio and video data into a data packet, for example, an IP (internet protocol) packet, and send the data packet to the BM-SC.
In the topology network shown in fig. 2, the BM-SC uses a portal as a content provider in the mobile communication network for authorizing the mobile communication network and initiating an MBMS bearer service (multimedia broadcast multicast service) in the mobile communication network and for delivering the content of the MBMS according to a predetermined time schedule.
Based on this, the BM-SC may transmit the audio-video data in the transport stream to the base station in the mobile communication network using TCP/IP protocol (network communication protocol).
Further, the base station in the mobile communication network may transmit the audio/video data in the transport stream to the terminal using a wireless cellular phone communication protocol, such as a 4G or 5G protocol (fourth generation wireless cellular phone communication protocol, or fifth generation wireless cellular phone communication protocol).
The television broadcast network, the BM-SC, the base station, and the terminal 4 systems each have an STC (System Time Counter, system clock counter) of their own, which may also be simply referred to as a clock in this embodiment, where the STC may be used for timing the corresponding system, and the timing frequencies of the STCs of the respective systems are different.
Further, each of the above 4 systems attaches a respective time stamp to a packet of the transport stream when transmitting the transport stream.
The time stamp is used to record the timing of the STC of each system when the system sends the data packet to the transmission channel, and in this embodiment, the timing is the count value of the timing.
In the present embodiment, since the timing frequencies are different between the television broadcast network and the mobile communication network, the BM-SC is required to convert the timing formats of both.
Specifically, based on the topology network constructed as described above, a reference time point for synchronization can be set for the television broadcast network and the mobile communication network, and denoted as t base 。
Further, the numerical conversion relation of the respective time stamps is determined according to the respective timing frequencies of the television broadcasting network and the mobile communication network.
Specifically, based on the set reference time point t base At the reference time point, the clock timing of the television broadcast network is T broad_base The timing of the clock of the mobile communication network is T mobile_base 。
Further, the television broadcasting network is set at the reference time point t base The time stamp of any time thereafter is denoted as t broad And the time stamp of the mobile communication network at the same time is denoted as t mobile 。
Wherein the numerical conversion relationship between the two timestamps may be expressed as shown in the following formula:
t mobile ＝T mobile_base +R×(t broad -T broad_base )
in this embodiment, when interconnecting transport streams between the television broadcast network and the mobile communication network, the BM-SC may convert the format of the transport stream from the television broadcast network and then transmit the converted format to the mobile communication network.
Specifically, for a mobile communication network employing the TCP/IP protocol, the BM-SC may encapsulate the received transport stream of the television broadcast network in data packets, for example, UDP (user datagram protocol) packets, and broadcast the UDP packets to the base station.
In another embodiment of the present application, the BM-SC may further extract audio and video data from the received transport stream, and encapsulate the extracted audio and video data into data packets according to the RTP protocol (real-time transport protocol), and broadcast the data packets to the base station.
Step S102, the broadcast multicast service center appoints the base station broadcast time of each base station according to the delay when broadcasting the preset data packet to each base station in the mobile communication network, and corrects the time stamp in the data packet according to the base station broadcast time.
In the embodiment of the application, the delays of transmitting the data packets in the transport stream to each base station in the mobile communication network at the BM-SC are different, so the BM-SC needs to determine and uniformly determine the base station broadcast time of the base station broadcasting the data packets to the terminal by budgets of the delays, and correct the time stamps in the data packets based on the base station broadcast time.
Specifically, in the mobile communication network shown in fig. 2, a plurality of base stations are included, wherein the minimum delay in each base station is denoted as d min The most significant delay in each base station is denoted as d max 。
Further, for a packet P containing a time stamp, if P is broadcast by BM-SC at time t bm The time t at which the packet P arrives at the nearest base station min Can be expressed as:
t min ＝t bm +d min
further, the time t at which the packet P arrives at the furthest base station max Can be expressed as:
t max ＝t bm +d max
based on this, the data packet P is broadcast by the base station at the base station broadcast time t bs The following should be satisfied: t is t bs >t max 。
Further, the BM-SC can correct the time stamp of the data packet broadcast by the base station to be the base station broadcast time t bs The base station is thus assigned a base station broadcast time for broadcasting to the terminals.
Based on this, the BM-SC may determine the size of the buffer required by the base station to broadcast the data packet.
Specifically, the difference between the minimum delay of the data packet reaching the nearest base station and the maximum delay of the data packet reaching the farthest base station is determined, and the size of the buffer zone is determined according to different processing delays of the base stations.
In a specific example, when any base station is at t bs When a data packet is broadcast to a terminal at a moment, and when a preset rate of a transport stream is a constant value r, a size of a buffer B required by a base station may be expressed as the following formula:
B＝r×(t bs -t min )＝r×(d max -d min +δ)
wherein δ represents a processing delay of an arbitrary base station in processing a packet, and δ=t bs -t max 。
Step S103, responding to the movement of any preset terminal transmitting the data packet with any base station in the mobile communication network, and enabling the terminal to correct the current time stamp in the data packet according to the timing of the clock of the base station.
In the embodiment of the present application, when the terminal receives a packet of a transport stream from the base station, if the position of the terminal is moved, that is, the distance from the base station to the terminal is changed, delay jitter is caused, that is, the delay in the transmission from the base station to the terminal is changed from a constant value to a non-constant value.
Further, after receiving the timestamp in the data packet, the terminal compares the timestamp with the local timing of the terminal at the receiving moment, and takes the difference value of the timestamp and the local timing as the input of the loop filter, based on the difference value, the output of the loop filter can be taken as the adjustment value of the frequency offset, that is, the adjustment value can be used for adjusting the timestamp of the terminal.
In this embodiment, when the base station transmits a transport stream to the terminal, the duration of each 10ms may be defined as a channel frame, where each channel frame includes 10 subframes with a length of 1ms, and in one subframe, different data may be multiplexed together in a time division, frequency division, or space division manner.
Based on this, although there is jitter in the delay of the data in one subframe reaching the terminal, the timer of the base station for transmitting data to the air interface is linearly and uniformly increased, so the timing of the above-mentioned duration of the boundary of each subframe can be used as a reference for correcting the time stamp, and the delay jitter introduced by the data burst transmission, that is, the way adopted by the BM-SC to correct the time stamp in the foregoing steps, can be eliminated.
However, due to the movement of the terminal, the delay of the time stamp between the subframes reaching the terminal has larger deviation, which can cause the input error of the loop filter to become larger and affect the stability of the loop filter.
Specifically, taking the specific example shown in fig. 3 as an example, the abscissa in fig. 3 represents time T, and the ordinate represents the timing value C of the STC, when the clock count frequency stabilizes at f, C may be represented as a linear function of T as shown below:
C＝f×T+k
further, as shown in fig. 3, the leftmost straight line in fig. 3 represents a variation curve of the STC of an arbitrary Base Station, and is represented as a Base Station STC in the figure.
In this example, when any one of the terminals is located at the position 1 and the transmission delay from the base station to the position 1 is T1 and the base station transmits a time stamp to the terminal at the time T1, the STC count value of the base station is C1, and the time stamp is marked as C1 based on this.
Further, the terminal may receive the timestamp C1 at time t1+t1.
Further, as shown in fig. 3, the middle straight line in fig. 3 shows the variation curve of the STC of the terminal at the position 1 after the clock recovery loop filter enters the steady state, and is denoted as the plane 1 STC in the figure.
Further, as shown in fig. 3, a straight line on the right side in fig. 3 shows an STC variation curve of the terminal when the terminal is located at position 2, and delays transmission from the base station to position 2 by t2, and is denoted as space 2 STC in the figure.
Further, when the terminal moves from the position 1 to the position 2, if the base station sends a timestamp C2 to the terminal at the time T2, the terminal will receive C2 at the time t2+t2, but the STC of the terminal will still count according to the time of the position 1, based on which the count C3 of the STC of the terminal can be expressed as the following formula:
C3＝C2+f×(t2-t1)
it can be seen that the difference between C2 and C3 is due to the error of the time stamp caused by the movement of the terminal from position 1 to position 2, i.e. jitter error, which is referred to as movement error in this embodiment.
Further, as described above, if this movement error is introduced into the loop filter, the filter becomes unstable.
Based on this, in order to eliminate the movement error, the base station transmits a preset reference signal for performing time offset tracking, for example, CRS (common reference signal) in 4G and TRS (tracking reference signal) in 5G, while transmitting data, with which the time offset of each subframe can be determined.
Further, the terminal receives the timestamp C1 with the subframe number n1 at the position 1, receives the timestamp C2 with the subframe number n2 when it moves to the position 2, and the time offset at (i) of the ith subframe, based on which the movement error of the timestamp can be determined by the following formula:
based on this, the current timestamp of the terminal can be corrected by using the determined movement error Δc, and corrected by the following formula:
C3＝C2+ΔC
step S104, switching the transmission with the base station to the transmission with any other base station except the base station in response to the terminal, so that the terminal corrects the current time stamp in the data packet according to the timing deviation of the clocks between the two base stations.
In the embodiment of the present application, when a terminal receives a data packet of a transmission stream from any one base station, if the terminal switches to receive the data packet from another any other base station, the transmission distance changes due to the difference between the two base stations and the terminal, and delay jitter is also caused, that is, the delay in the transmission from the base station to the terminal is changed from a constant value to a non-constant value.
Specifically, taking the specific example shown in fig. 4 as an example, an arbitrary terminal receives, at a fixed location, a data packet of Base Station1 in fig. 4, base Station1, and Base Station2 in fig. 4, that is, base Station2, then the transmission delay from Base Station1 to the terminal is T1, the transmission delay from Base Station2 to the terminal is T2, and there is a timing error Δt between Base Station1 and Base Station2, based on which the timing deviation between Base Station1 and Base Station2 determined by the terminal is expressed as the following formula:
Δt＝t2-t1+ΔT
further, if the base station1 and the base station2 send the same time stamp C at the time T1 and the time T2, respectively, the conversion relationship between the time T2 and the time T1 may be expressed as:
T2＝T1+ΔT
further, the terminal will receive the time stamp C sent by the base station1 at time t1+t1 and receive the time stamp C sent by the base station2 at time t2+t2.
Based on this, if the terminal switches base stations before time t2+t2, that is, switches the reception from base station1 to the reception from base station2, the STC of the terminal will still be clocked according to the timing of base station1, and based on this, there is a time stamp error between the STC and C of the terminal as follows:
ΔC＝f×Δt
in the present embodiment, the jitter error of the time stamp is referred to as a switching error to distinguish the movement error in the foregoing steps.
Based on this, in order to eliminate the influence of the switching error on the loop filter, the base station transmits a preset reference signal for performing time offset tracking, for example, CRS (common reference signal) in 4G and TRS (tracking reference signal) in 5G, while transmitting data, with which the time offset Δt (i) of each subframe can be determined, and thus, the switching error for the time stamp can be determined using the following formula:
where m represents the start of the m-th subframe, the terminal switches the base station1 to the base station 2.
Based on this, the current timestamp of the terminal can be corrected by using the determined handover error Δc, and corrected by the following formula:
ΔC‘＝C×ΔC
therefore, the timing synchronization method of the mobile communication network and the television broadcast network according to the embodiment of the application is based on the topology network constructed by using the broadcast multicast service center and used for interconnecting the mobile communication network and the television broadcast network, comprehensively considers the time delay when the broadcast multicast service center transmits to each base station, designates the broadcast time of the base station and corrects the time stamp.
Further, when the terminal moves, the method also determines the error of the time stamp according to the timing of the clock of the base station, so as to correct the time stamp, and when the terminal switches the base station, the error of the time stamp of the terminal is determined according to the error of the clock between the two base stations, so that the time stamp at the moment is corrected, and the condition of delay jitter is eliminated.
It should be noted that, the method of the embodiments of the present application may be performed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the methods of embodiments of the present application, which interact with each other to complete the methods.
It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Based on the same inventive concept, the embodiments of the present application also provide a timing synchronization device for a mobile communication network and a television broadcast network, corresponding to the methods of any of the embodiments.
Referring to fig. 5, the timing synchronization apparatus of a mobile communication network and a television broadcasting network includes: a topology network construction module 501, a first timestamp correction module 502, a second timestamp correction module 503, and a third timestamp correction module 504;
wherein, the topology network construction module 501 is configured to set a preset mobile communication network as a node of a preset television broadcast network, and construct a topology network for interconnecting the mobile communication network and the television broadcast network by using a preset broadcast multicast service center;
the first timestamp correction module 502 is configured to enable the broadcast multicast service center to specify a base station broadcast time of each base station according to a delay when a preset data packet is broadcast to each base station in the mobile communication network, and correct a timestamp in the data packet according to the base station broadcast time;
the second timestamp correction module 503 is configured to, in response to movement of any preset terminal in the mobile communication network that transmits the data packet with any base station, cause the terminal to correct a current timestamp in the data packet according to the timing of the clock of the base station;
the third timestamp correction module 504 is configured to switch, in response to the terminal transmitting with the base station, to transmitting with any one of the other base stations except the base station, to cause the terminal to correct the current timestamp in the data packet according to the timing deviation of the clocks between the two base stations.
For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the embodiments of the present application.
The device of the foregoing embodiment is configured to implement the timing synchronization method of the corresponding mobile communication network and the television broadcast network in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein.
Based on the same inventive concept, corresponding to the method of any embodiment, the embodiment of the application further provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the timing synchronization method of the mobile communication network and the television broadcast network according to any embodiment.
Fig. 6 shows a more specific hardware architecture of an electronic device according to this embodiment, where the device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present application.
The Memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 1020 may store an operating system and other application programs, and when the solutions provided by the embodiments of the present application are implemented in software or firmware, the relevant program code is stored in memory 1020 and invoked for execution by processor 1010.
The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown in the figure) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
Communication interface 1040 is used to connect communication modules (not shown) to enable communication interactions of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).
Bus 1050 includes a path for transferring information between components of the device (e.g., processor 1010, memory 1020, input/output interface 1030, and communication interface 1040).
It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary to implement the embodiments of the present application, and not all the components shown in the drawings.
The device of the foregoing embodiment is configured to implement the timing synchronization method of the corresponding mobile communication network and the television broadcast network in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein.
Based on the same inventive concept, corresponding to the method of any embodiment described above, the present application further provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the timing synchronization method of the mobile communication network and the television broadcast network described in any embodiment described above.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
The storage medium of the foregoing embodiments stores computer instructions for causing the computer to perform the timing synchronization method of the mobile communication network and the television broadcast network according to any one of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in details for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The embodiments of the present application are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the present application, are therefore intended to be included within the scope of the present application.

Claims (10)

1. A method for timing synchronization of a mobile communication network and a television broadcast network, comprising:
setting a preset mobile communication network as a node of a preset television broadcasting network, and constructing a topology network for interconnecting the mobile communication network and the television broadcasting network by utilizing a preset broadcasting multicast service center;
the broadcast multicast service center appoints the base station broadcasting time of each base station according to the delay when broadcasting the preset data packet to each base station in the mobile communication network, and corrects the time stamp in the data packet according to the base station broadcasting time;
responding to movement of any preset terminal transmitting the data packet with any base station in the mobile communication network, and enabling the terminal to correct the current time stamp in the data packet according to the timing of the clock of the base station;
and switching transmission with the base station to transmission with any other base station except the base station in response to the terminal, so that the terminal corrects the current time stamp in the data packet according to the timing deviation of clocks between the two base stations.
2. The method of claim 1, wherein after said constructing a topology network for interconnecting said mobile communication network and said television broadcast network, further comprising:
setting the same reference time point for the television broadcasting network and the mobile communication network in the topology network;
and determining a numerical conversion relation between the time stamp of the television broadcasting network and the time stamp of the mobile communication network at the reference time point according to the proportional relation between the clock of the television broadcasting network and the clock of the mobile communication network on the timing frequency.
3. The method of claim 1, wherein after said constructing a topology network for interconnecting said mobile communication network and said television broadcast network, further comprising:
and responding to the broadcast multicast service center to receive the transport stream input by the television broadcast network, and enabling the broadcast multicast service center to encapsulate the transport stream with a user datagram protocol and broadcast the transport stream to the mobile communication network.
4. The method of claim 1, wherein the causing the broadcast multicast service center to designate base station broadcast times of respective base stations in the mobile communication network according to delays in broadcasting preset data packets to the respective base stations comprises:
determining the maximum delay when the broadcast multicast service center broadcasts data packets to each base station respectively;
and determining the central broadcasting time when the broadcast multicast service center broadcasts the data packet to any base station, and designating the base station broadcasting time which is larger than the sum of the maximum delay and the central broadcasting time for each base station.
5. The method of claim 4, wherein said correcting the time stamp in the data packet based on the base station broadcast time further comprises:
determining the minimum delay when the broadcast multicast service center broadcasts data packets to each base station respectively, and determining the difference between the minimum delay and the maximum delay;
determining a preset rate when the base station broadcasts the data packet and processing delay of the data packet processed in the base station;
and for any base station, determining the buffer area size when the base station broadcasts by using the processing delay and the difference value at the speed.
6. The method of claim 1, wherein the causing the terminal to correct the current timestamp in the data packet according to the timing of the clock of the base station comprises:
the terminal performs time offset tracking by utilizing a reference signal sent by the base station, and determines a first time offset of each subframe in each channel frame received by the terminal;
accumulating the first time offset of each subframe to obtain a movement error of the current time stamp in the data packet;
and correcting the current time stamp by using the movement error of the current time stamp to obtain a corrected time stamp.
7. The method of claim 1, wherein the causing the terminal to correct the current timestamp in the data packet based on the timing error of the clock between the two base stations comprises:
the terminal performs time offset tracking by utilizing the reference signals sent by the two base stations respectively, and the timing deviation between the two base stations is estimated;
determining the switching error of the current time stamp in the data packet according to the timing deviation;
and correcting the current time stamp by utilizing the switching error of the current time stamp to obtain a corrected time stamp.
8. A timing synchronization apparatus for a mobile communication network and a television broadcast network, comprising: the system comprises a topology network construction module, a first timestamp correction module, a second timestamp correction module and a third timestamp correction module;
the topology network construction module is configured to set a preset mobile communication network as a node of a preset television broadcasting network, and construct a topology network for interconnecting the mobile communication network and the television broadcasting network by utilizing a preset broadcasting multicast service center;
the first timestamp correction module is configured to enable the broadcast multicast service center to specify the base station broadcast time of each base station according to the delay when a preset data packet is broadcast to each base station in the mobile communication network, and correct the timestamp in the data packet according to the base station broadcast time;
the second timestamp correction module is configured to respond to movement of any preset terminal transmitting the data packet with any base station in the mobile communication network, so that the terminal corrects the current timestamp in the data packet according to the timing of the clock of the base station;
the third timestamp correction module is configured to switch transmission with the base station to any one of the other base stations except the base station in response to the transmission with the base station by the terminal, so that the terminal corrects the current timestamp in the data packet according to the timing deviation of clocks between the two base stations.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable by the processor, wherein the processor implements the method of any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium, characterized in that the non-transitory computer readable storage medium stores computer instructions for causing a computer to perform the method according to any one of claims 1 to 7.
CN202310037683.7A 2023-01-09 2023-01-09 Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium Active CN116455497B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310037683.7A CN116455497B (en) 2023-01-09 2023-01-09 Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310037683.7A CN116455497B (en) 2023-01-09 2023-01-09 Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium

Publications (2)

Publication Number Publication Date
CN116455497A CN116455497A (en) 2023-07-18
CN116455497B true CN116455497B (en) 2024-04-16

Family

ID=87119000

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310037683.7A Active CN116455497B (en) 2023-01-09 2023-01-09 Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium

Country Status (1)

Country Link
CN (1) CN116455497B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1960240A (en) * 2006-09-15 2007-05-09 中兴通讯股份有限公司 Emission method of mobile multimedia broadcast
CN101047776A (en) * 2006-04-17 2007-10-03 华为技术有限公司 Mobile broadcast network system and method for implementing synchronous of the network
CN101132392A (en) * 2006-08-23 2008-02-27 华为技术有限公司 Single-carrier frequency broadcast structure and method for implementing its business transmission
CN103945390A (en) * 2013-01-18 2014-07-23 中国科学院上海高等研究院 Television broadcasting network-mobile communication network collaborative spatial multiplexing transmission method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4189422B2 (en) * 2006-11-14 2008-12-03 株式会社東芝 Broadcast TS distribution system, broadcast TS distribution device, user terminal device and distribution method used in this system
US10405149B2 (en) * 2015-06-09 2019-09-03 Samsung Electronics Co., Ltd. Enhanced MBMS-based signal transmission/reception method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101047776A (en) * 2006-04-17 2007-10-03 华为技术有限公司 Mobile broadcast network system and method for implementing synchronous of the network
CN101132392A (en) * 2006-08-23 2008-02-27 华为技术有限公司 Single-carrier frequency broadcast structure and method for implementing its business transmission
CN1960240A (en) * 2006-09-15 2007-05-09 中兴通讯股份有限公司 Emission method of mobile multimedia broadcast
CN103945390A (en) * 2013-01-18 2014-07-23 中国科学院上海高等研究院 Television broadcasting network-mobile communication network collaborative spatial multiplexing transmission method

Also Published As

Publication number Publication date
CN116455497A (en) 2023-07-18

Similar Documents

Publication Publication Date Title
CN111147907B (en) Method, device and system for synchronously playing multiple intelligent terminals and intelligent terminal
CN109906613B (en) Multi-mode synchronized rendering of audio and video
US8155157B2 (en) Method and apparatus for synchronizing applications of terminals in communication network
CN109565466B (en) Lip sound synchronization method and device among multiple devices
US20170098466A1 (en) Encoded Audio Synchronization
CN101809965B (en) Communication technique able to synchronise received stream with that sent to another device
CN108366283B (en) Media synchronous playing method among multiple devices
CN100561903C (en) Dispensing device, relay, receiving system and have the network system of these devices
US20180324102A1 (en) Receiving apparatus and data processing method
TWI545926B (en) Time synchronization method and system
JP6232870B2 (en) Wireless communication system, wireless communication method, program, and recording medium
CN101137066B (en) Multimedia data flow synchronous control method and device
CN116455497B (en) Timing synchronization method device for mobile communication network and television broadcast network, electronic equipment and computer readable storage medium
EP3868043B1 (en) Wireless audio synchronization
US11956072B2 (en) Method and system for timing synchronization in a cellular network
KR102174325B1 (en) Computer readable recording medium recorded program for providing content adapted for network, and APPARATUS FOR PROVIDING CONTENT ADAPTED FOR NETWORK
CN101202921A (en) Clock synchronous system of moving multimedia network
CN114554242B (en) Live broadcast method and readable storage medium
CN112671696B (en) Message transmission method, device, computer equipment and computer storage medium
JP7303670B2 (en) MMT receiver and program
WO2021153259A1 (en) Reception device and method
JP2008283300A (en) Reception device
JP7074426B2 (en) Synchronization processing device, signal processing system, synchronization processing method, and synchronization processing program
CN115278857A (en) Anti-interference audio data transmission method and device
CN117856959A (en) Data stream synchronization method, device, electronic equipment and storage medium

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information
CB02 Change of applicant information

Address after: No. 602-188, Comprehensive Building, No. 1099 Qingxi Second Road, Hezhuang Street, Qiantang District, Hangzhou City, Zhejiang Province, 311119

Applicant after: Hangzhou Bibo Semiconductor Co.,Ltd.

Address before: Room 105-7, Building 1, No. 1818-2, Wenyi West Road, Yuhang Street, Yuhang District, Hangzhou City, Zhejiang Province 310023

Applicant before: Hangzhou Bibo Technology Co.,Ltd.

GR01 Patent grant
GR01 Patent grant