CN104981010B - Time synchronizing signal, the providing method of frequency synchronization signal and device - Google Patents
Time synchronizing signal, the providing method of frequency synchronization signal and device Download PDFInfo
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- CN104981010B CN104981010B CN201410133727.7A CN201410133727A CN104981010B CN 104981010 B CN104981010 B CN 104981010B CN 201410133727 A CN201410133727 A CN 201410133727A CN 104981010 B CN104981010 B CN 104981010B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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Abstract
The present invention discloses the providing method and device of a kind of time synchronizing signal, frequency synchronization signal, for providing synchronizing clock signals based on a transmission network for each standard type mobile communication base station.The providing method includes: that each communication system time synchronization signal in the transmission network core layer of each communication network and first group of transmission node of convergence layer is passed down to interface equipment step by step, wherein first group of transmission node works in clock BC mode；In interface equipment and a shared transmission network, each communication system time synchronization signal is respectively sent to base station corresponding to each communication network through second group of transmission node step by step, wherein second group of transmission node works in clock TC mode.The present invention is suitable for multiple communication networks needs the scene of shared third party transfer system or multi-party communication network Joint construction and sharing Transmission system for some reason, on the one hand equipment investment cost is reduced, on the other hand gets rid of mobile communication base station addressing and is limited by GPS mounting condition.
Description
Technical field
The present invention relates to mobile communication fields, more particularly to a kind of time synchronizing signal, frequency synchronization signal mention
For method and apparatus.
Background technique
The normal work of various mobile communication base stations (GSM, CDMA2000, TD-SCDMA, WCDMA, TD-LTE etc.) all must
The Frequency Synchronization or time synchronization of network must be relied on, wherein GSM, WCDMA need to only provide frequency synchronization signal, and TD-SCDMA,
The base station TD-LTE, CDMA2000 needs while providing time and frequency synchronization signal, as shown in the table:
| Wireless standard | Clock (frequency) is synchronous to be required | Time (phase) synchronous requirement |
| GSM | 0.05ppm | NA |
| WCDMA | 0.05ppm | NA |
| TD-SCDMA | 0.05ppm | ±1.5us |
| CDMA2000 | 0.05ppm | ±3us |
| TD-LTE | 0.05ppm | ±1.5us |
It is provided there are two types of frequency synchronization signal modes for base station at present.
Method 1: Transmission system obtains frequency synchronization signal from BITS, by synchronous ether, with the mode of master-slave synchronisation,
Node in transmission network transmits downwards step by step, eventually arrives at the transmission device positioned at base station side, and base station is from connection transmission device
Each port (2M/ Ethernet) obtain frequency synchronization signal.
Method 2: directly in base station, installation GPS obtains frequency synchronization signal.
At present for base station provide the method for time synchronizing signal also there are two types of:
Method 1: GPS is installed in base station, from GPS acquisition time synchronization signal, this is the method being widely used at present.
Method 2: by the way that based on the transmission network for supporting 1588v2 agreement, each node of transmission device works in clock BC mould
Formula, transmission device transmit downwards 1588v2 protocol massages with BMC algorithm step by step, and the transmission eventually arrived at positioned at base station side is set
Standby, base station passes through the synchronous letter of the 1pps+TOD interface acquisition time of connection transmission device service port (Ethernet) or transmission device
Number.
In the occasion (such as in-door covering, subway, GPS mounting condition are limited) that cannot install GPS, using support 1588v2
Transmission network carry out clock sync signal transmitting become sole mode.
At present in the case where that can not install GPS, the base station of each communication network (can only be supported from respective transmission network
1588v2) obtain.And for the occasion of certain Joint construction and sharings, when Transmission system is unique (such as by the more of participation Joint construction and sharing
A wherein side for a communication network provides, third party provides), it is each logical since each communication network has respective clock synchronous network network
The synchronizing network of communication network is there may be frequency or the difference of time, when the frequency of shared transmission network, time signal and each logical
When the frequency of communication network, time synchronizing signal have differences, frequency that the base station of each communication network is obtained from shared transmission network,
The risk that time synchronizing signal can not work normally there may be base station slip or directly.
Therefore, in the scene of shared Transmission system, the base station for multi communication network of doing nothing at present provide simultaneously reliable frequency,
The solution of time synchronizing signal.
Summary of the invention
The present invention provides the providing method and device of a kind of time synchronizing signal, frequency synchronization signal, for solving at present
The problem of base station of inaction multi communication network provides reliable frequency, the solution of time synchronizing signal simultaneously.
To achieve the above object, according to the first aspect of the invention, a kind of providing method of time synchronizing signal is provided,
And use following technical scheme:
The providing method of time synchronizing signal includes: each communication system time synchronization signal in each communication network transmission net
First group of transmission node of core layer and convergence layer is passed down to interface equipment step by step, wherein first group of transmission node is equal
Work in clock BC mode；In the access layer of the interface equipment and a shared transmission network, each communication system time is same
It walks signal and is respectively sent to base station corresponding to each communication network step by step through second group of transmission node, wherein described second
Group transmission node works in clock TC mode.
Further, the interface equipment is Packet Transport Network equipment, described in the interface equipment and a shared transmission
The access layer of network includes: the time multiplexing circuit for the Packet Transport Network equipment for controlling each communication network with optical interface
STM-1 is docked.
Further, each communication system time synchronization signal is respectively sent to described step by step through second group of transmission node
Before base station corresponding to each communication network, the providing method further include: control the interface equipment to each communication network
Network time synchronizing signal is replicated, and multiple each communication system time synchronization signals are obtained, corresponding for being transmitted separately to
Multiple base stations.
Further, each communication system time synchronization signal is each standard time synchronizing signal.
According to the second aspect of the invention, a kind of offer device of time synchronizing signal is provided, and uses following technology
Scheme:
The offer device of time synchronizing signal includes: the first transfer module, is existed for each communication system time synchronization signal
The core layer of each communication network transmission net and first group of transmission node of convergence layer are passed down to interface equipment step by step, wherein institute
It states first group of transmission node and works in clock BC mode；Second transfer module, in the interface equipment and a shared biography
The access layer of defeated network, each communication system time synchronization signal are respectively sent to described each step by step through second group of transmission node
Base station corresponding to communication network, wherein second group of transmission node works in clock TC mode.
Further, the interface equipment is Packet Transport Network equipment, second transfer module further include:
First control module, the time multiplexing circuit of the Packet Transport Network equipment for controlling each communication network
It is docked with optical interface STM-1.
Further, the offer device further include: the second control module, for controlling the interface equipment to described
Each communication system time synchronization signal is replicated, and multiple each communication system time synchronization signals is obtained, for passing respectively
Transport to corresponding multiple base stations.
Further, each communication system time synchronization signal is each standard time synchronizing signal.
According to the third aspect of the present invention, a kind of providing method of frequency synchronization signal is provided, and uses following technology
Scheme:
The providing method of frequency synchronization signal includes: the frequency synchronization signal for specifying the communication network in each communication network
As the frequency synchronization signal of each communication base station, the frequency synchronization signal is by specifying communication network transmission net core
First group of transmission node of central layer and convergence layer is passed down to interface equipment step by step；In the interface equipment and a shared transmission
The access layer of network, the frequency synchronization signal are sent in a manner of ether master-slave synchronisation step by step by synchronizing through second group of transmission node
The base station of each communication network.
Further, the interface equipment is Packet Transport Network equipment, described in the interface equipment and a shared transmission
The access layer of network includes: the time multiplexing circuit for the Packet Transport Network equipment for controlling each communication network with optical interface
STM-1 is docked.
Further, each communication system time synchronization signal is each standard time synchronizing signal.
According to the fourth aspect of the present invention, a kind of offer device of frequency synchronization signal is provided, and uses following technology
Scheme:
The offer device of frequency synchronization signal includes: the first transfer module, for specifying the communication in each communication network
Frequency synchronization signal of the frequency synchronization signal of network as each communication base station, the frequency synchronization signal pass through finger
First group of transmission node for determining communication network transmission net core layer and convergence layer is passed down to interface equipment step by step；Second transmitting
Module, for the access layer in the interface equipment and a shared transmission network, the frequency synchronization signal is to synchronize ether master
It is sent to the base station of each communication network step by step through second group of transmission node from the method for synchronization.
Further, the interface equipment is Packet Transport Network equipment, and second transfer module includes: control module,
Time multiplexing circuit for controlling the Packet Transport Network equipment of each communication network is carried out pair with optical interface STM-1
It connects.
Further, each communication system time synchronization signal is each standard time synchronizing signal.
The present embodiment of the present invention is by providing synchronised clock using a shared Transmission system as the base station of multi communication network
Solution, solve multi communication network must share Transmission system and base station can not install GPS scene base station construction
Problem.The method can also be applied to base station GPS and install unrestricted scene other than being applied to above-mentioned special scenes, by altogether
It builds and shares a set of Transmission system, each communication network can reduce transmission network and GPS investment, save fiber resource, improve clock and pass
Base station deployment speed is accelerated in the safety passed.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and is constituted part of this application, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the broad flow diagrams of the providing method of time synchronizing signal described in the embodiment of the present invention one；
Fig. 2 indicates the specific flow chart of the providing method of time synchronizing signal described in the embodiment of the present invention two；
Fig. 3 indicates the structural schematic diagram of the offer device of time synchronizing signal described in the embodiment of the present invention three；
Fig. 4 indicates the broad flow diagram of the providing method of frequency synchronization signal described in the embodiment of the present invention four；
Fig. 5 indicates the specific flow chart of the providing method of frequency synchronization signal described in the embodiment of the present invention five；
Fig. 6 indicates the structural schematic diagram of the offer device of frequency synchronization signal described in the embodiment of the present invention six.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment one
Fig. 1 shows the broad flow diagrams of the providing method of time synchronizing signal described in the embodiment of the present invention one.
Shown in Figure 1, the providing method of time synchronizing signal includes:
S101: each communication system time synchronization signal is in the core layer of each communication network transmission net and first group of convergence layer
Transmission node is passed down to interface equipment step by step, wherein first group of transmission node works in clock BC mode；
S103: in the access layer of the interface equipment and a shared transmission network, each communication system time is synchronous to be believed
Number it is respectively sent to base station corresponding to each communication network step by step through second group of transmission node, wherein second group of biography
Defeated node works in clock TC mode.
In step s101, each communication system time synchronization signal passes through core in the transmission network of each communication network oneself
The characteristics of central layer is transmitted downwards step by step with convergence layer, above-mentioned transmission is that transmission node equipment works in clock BC mode.In step
In rapid S103, in the other side, i.e., in interface equipment and this side of access layer, based on a shared transmission network by above-mentioned each communication
The time synchronizing signal of network is sent to corresponding base station through second group of transmission node step by step, wherein second group of transmission node
Work in clock TC mode.
For example, China Mobile, China Telecom, China Unicom time synchronizing signal pass through the core of respective transmission network
The characteristics of layer transmits downwards step by step with convergence layer, above-mentioned transmission is that transmission node equipment works in 1588v2 clock BC mode.
It in step s 103, i.e., will be above-mentioned each based on a shared transmission network in interface equipment and this side of access layer in the other side
The time synchronizing signal of communication network is replicated through interface equipment, multiple time synchronizing signals of each communication network is obtained, by second
Group transmission node is sent to the base station of each communication network step by step, wherein second group of transmission node works in
1588v2 clock TC mode.
Above-described embodiment is solved when multiple communication networks need to share a Transmission system, the base station of each communication network
Obtain meet itself normal work time synchronizing signal the problem of, make multiple communication networks share a set of Transmission system become can
Can, the transmission network investment of each communication network is reduced, saves fibre core resource, breaching base station must be from GPS acquisition time
The limitation of synchronization signal reduces base station selection difficulty, accelerates base station deployment progress.
Preferably, each communication system time synchronization signal is respectively sent to described each step by step through second group of transmission node
Before base station corresponding to communication network, the providing method further include: control the interface equipment to each communication network
Time synchronizing signal is replicated, and multiple time synchronizing signals of each communication network are obtained, corresponding more for being transmitted separately to
A base station.
Preferably, each communication network is each standard time synchronizing signal.
Since the time synchronizing signal of each communication network is both needed to be sent respectively by shared Transmission system to corresponding each communication network
Multiple base stations of network, then interface equipment not only needs work in TC mode, but also need to support the 1588v2 clock chain circuit more than 1 pair
Copy function.
Embodiment two
Fig. 2 indicates the specific flow chart of the providing method of time synchronizing signal described in the embodiment of the present invention two.
Referring specifically to shown in Fig. 2, work in clock BC mode, Fig. 2 in general, the clock path node of transmission network is whole,
Transmission network core layer, convergence layer transmission node work in clock BC mode, step by step by the time signal obtained from clock source
It passes down to up to Packet Transport Network equipment PTN-1/PTN-2, PTN-1/PTN-2 and shared transmission network (access layer below
Equipment) all work in clock TC mode.
The reason for this design is that transmission device works in clock BC mode, the letter that clock node comes from upstream
1588v2 message is parsed in number, recovery time signal simultaneously downstream continues to transmit, and BC mode can only track upstream
Clock signal all the way, it is assumed that PTN-1/PTN-2 was tracked is the time synchronizing signal that China Mobile's transmission network is brought, then Chinese
The time signal that telecommunication transmission net is brought just is blocked when reaching PTN-1/PTN-2, and the base station of China Telecom takes less than in
The time synchronizing signal of state's telecommunication transmission net transmitting.When transmission device works in clock TC mode, it not to 1588v2 message into
Row parsing, recovered clock, the clock signal next to upstream stamp the timestamp just transmission downwards of this equipment, and when support multichannel
The transparent transmitting of clock.This means that the 1588v2 clock of China Telecom's transmission network transmitting can continue working in the shared of TC mode
It is transmitted in transmission network, reaches the transmission device port of connection China Telecom base station.Thereby realize each common carrier
1588v2 clock is not interfere with each other, while being transmitted on shared transmission network.
Embodiment three
Fig. 3 indicates the structural schematic diagram of the offer device of time synchronizing signal described in the embodiment of the present invention three.
Shown in Figure 3, the offer device of time synchronizing signal includes: the first transfer module 30, is used for each communication network
Time synchronizing signal is passed down to step by step in the core layer of each communication network transmission net and first group of transmission node of convergence layer
Interface equipment, wherein first group of transmission node works in clock BC mode；Second transfer module 32, for being connect described
The access layer of jaws equipment and a shared transmission network, each communication system time synchronization signal through second group of transmission node step by step
It is respectively sent to base station corresponding to each communication network, wherein second group of transmission node works in clock TC mould
Formula.
Preferably, the interface equipment is Packet Transport Network equipment, second transfer module further include: the first control mould
Block is carried out for controlling the time multiplexing circuit of the Packet Transport Network equipment of each communication network with optical interface STM-1
Docking.
Preferably, the offer device further include: the second control module, for controlling the interface equipment to described each
Communication system time synchronization signal is replicated, and multiple each communication system time synchronization signals is obtained, for transmitting respectively
To corresponding multiple base stations.
Preferably, each communication network is each standard time synchronizing signal.
Example IV
Fig. 4 indicates the broad flow diagram of the providing method of frequency synchronization signal described in the embodiment of the present invention four.
Shown in Figure 4, the providing method of synchronizing clock signals includes:
S401: the providing method of frequency synchronization signal includes: to specify the frequency of the communication network in each communication network same
Frequency synchronization signal of the signal as each communication base station is walked, the frequency synchronization signal is passed by specified communication network
First group of transmission node of defeated net core layer and convergence layer is passed down to interface equipment step by step；
S403: in the access layer of the interface equipment and a shared transmission network, the frequency synchronization signal with it is synchronous with
The too master-slave synchronisation mode base station that is sent to each communication network step by step through second group of transmission node.
In step S401, specify the frequency synchronization signal of a wherein communication network as each communication network base station
Frequency synchronization signal, the core layer of the designated communication network transmission net of the frequency synchronization signal and first group of transmission section of convergence layer
Point is passed down to interface equipment in a manner of ether master-slave synchronisation to synchronize step by step, and in step S403, interface equipment is extracted from finger
Determine the frequency synchronization signal that communication network transmitting comes, and continue by synchronize in a manner of ether master-slave synchronisation by shared Transmission system by
Grade is sent to the base station of each communication network.
Above-described embodiment is to provide frequency synchronization signal by a wherein communication network (such as China Mobile), and the frequency is same
Step signal is sent to the base station of each communication network by first, second group of transmission node, i.e., the base station of each communication network is synchronous
In the frequency of specified communication network.
Theoretically, the base station (it is required that 1588v2 agreement is supported in base station) of each standard can restore from 1588v2 message
Frequency synchronization signal out, but its precision is low compared with the synchronization ether clock accuracy of PTN/IP RAN transmission of network, it cannot be guaranteed that each logical
The base station of communication network works normally.
Therefore, the present embodiment provides clock source letter by a wherein communication network to guarantee the precision of frequency synchronization signal
Number, the core layer and (the first group of transmission of convergence layer transmission node that the frequency synchronization signal passes through specified communication network transmission net
Node), shared transmission device node (second group of transmission node) be sent to the base station of each communication network, i.e., the base of each communication network
It stands and is synchronized with the frequency of specified communication network.
Frequency since the clock source of each common carrier Frequency Synchronization net is all caesium clock or GPS, between operator's net
Deviation very little, as long as the Frequency Synchronization clock accuracy of described first group, second group transmission device transmitting meets each communication operation
Quotient's base station operation requires (frequency error is within 0.05ppm), then the base station of each common carrier can work normally, and will not go out
Existing circuit slip problem.
Embodiment five
Fig. 5 indicates the specific flow chart of the providing method of frequency synchronization signal described in the embodiment of the present invention five.
Theoretically, the base station (it is required that 1588v2 agreement is supported in base station) of each standard can restore from 1588v2 message
Frequency synchronization signal out, but its precision is low compared with the synchronization ether clock accuracy of PTN/IP RAN transmission of network, it cannot be guaranteed that each fortune
The base station for seeking quotient works normally.
When transmission network access layer is shared Transmission system, the synchronization ether signal of each operator is shared Transmission system resistance
Every each common carrier base station can not obtain the frequency synchronization signal of respective transmission network transmitting.
The present embodiment technical solution is that the base station of all common carriers tracks specified common carrier (the present embodiment is
China Mobile) transmission network transmitting synchronization ether clock, according to the experience that former common carrier SDH network interconnects, fortune
, there is not circuit slip problem in deviation very little between battalion's quotient's Frequency Synchronization net.Therefore this solution is simple and feasible, real
It tramples proof and does not occur base station slip.
Embodiment six
Fig. 6 indicates the structural schematic diagram of the offer device of frequency synchronization signal described in the embodiment of the present invention six.
Shown in Figure 6, the offer device of frequency synchronization signal includes: the first transfer module 60, for specifying each communication
Frequency synchronization signal of the frequency synchronization signal of a communication network in network as each communication base station, the frequency
Synchronization signal is connect by specifying first group of transmission node of communication network transmission net core layer and convergence layer to be passed down to step by step
Jaws equipment；Second transfer module 62, for the access layer in the interface equipment and a shared transmission network, the Frequency Synchronization
Signal is sent to each base station through second group of transmission node of shared Transmission system step by step.
Preferably, second transfer module 62 includes: control module, is divided described in each communication network for controlling
The time multiplexing circuit of group transmission net equipment is docked with optical interface STM-1.
Preferably, each communication network is each standard time synchronizing signal.
The present invention by providing time, Frequency Synchronization letter using a shared Transmission system as the base station of multi communication network simultaneously
Number solution, solve multi communication network must share Transmission system and base station can not install GPS scene base station
Construction Problems.The method can also be applied to base station GPS and install unrestricted scene other than being applied to above-mentioned special scenes, lead to
Cross a set of Transmission system of Joint construction and sharing, each communication network can reduce transmission network and GPS investment, fiber resource be saved, when raising
The safety of clock transmitting, accelerates base station deployment speed.
Various communication networks in the present invention include but is not limited to: GSM, CDMA2000, TD-SCDMA, WCDMA, TD-
The various standard communication networks such as LTE, FDD-LTE, 4G, 5G or even WLAN etc..
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of providing method of time synchronizing signal characterized by comprising
Each communication system time synchronization signal is in the core layer of each communication network transmission net and first group of transmission node of convergence layer
It is passed down to interface equipment step by step, wherein first group of transmission node works in clock BC mode；
In the access layer of the interface equipment and a shared transmission network, each communication system time synchronization signal is through second group
Transmission node is respectively sent to base station corresponding to each communication network step by step, wherein the equal work of second group of transmission node
Make in clock TC mode；
The interface equipment is Packet Transport Network equipment, the access layer packet in the interface equipment and a shared transmission network
It includes:
The time multiplexing circuit of the Packet Transport Network equipment of each communication network is controlled to carry out pair with optical interface STM-1
It connects.
2. providing method as described in claim 1, which is characterized in that each communication system time synchronization signal is through second group
Transmission node is respectively sent to step by step before base station corresponding to each communication network, the providing method further include:
It controls the interface equipment to replicate each communication system time synchronization signal, obtains multiple each communication networks
Network time synchronizing signal, for being transmitted separately to corresponding multiple base stations.
3. such as the described in any item providing methods of claim 1 to 2, which is characterized in that each communication system time is synchronous to be believed
Number be each standard time synchronizing signal.
4. a kind of offer device of time synchronizing signal characterized by comprising
First transfer module, for each communication system time synchronization signal each communication network transmission net core layer and convergence layer
First group of transmission node be passed down to interface equipment step by step, wherein first group of transmission node works in clock BC mould
Formula；
Second transfer module, for the access layer in the interface equipment and a shared transmission network, when each communication network
Between synchronization signal through second group of transmission node be respectively sent to base station corresponding to each communication network step by step, wherein it is described
Second group of transmission node works in clock TC mode；
The interface equipment is Packet Transport Network equipment, second transfer module further include:
First control module, for control each communication network the Packet Transport Network equipment time multiplexing circuit with light
Interface STM-1 is docked.
5. providing device as claimed in claim 4, which is characterized in that further include:
Second control module replicates each communication system time synchronization signal for controlling the interface equipment, obtains
To multiple each communication system time synchronization signals, for being transmitted separately to corresponding multiple base stations.
6. such as the described in any item offer devices of claim 4 to 5, which is characterized in that each communication system time is synchronous to be believed
Number be each standard time synchronizing signal.
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| US10536914B2 (en) * | 2016-09-22 | 2020-01-14 | Qualcomm Incorporated | Synchronizing a 5G communication channel using a 4G timing synchronization parameter |
| CN110784275B (en) * | 2018-07-29 | 2021-02-05 | 华为技术有限公司 | Time synchronization deviation adjusting method, device, terminal and access stratum equipment |
| CN112929116A (en) * | 2021-01-19 | 2021-06-08 | 中国联合网络通信集团有限公司 | Method, device and system for transmitting time synchronization signal |
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| CN102215559A (en) * | 2010-04-09 | 2011-10-12 | 上海华为技术有限公司 | Method for obtaining external clock signal by multimode base station and multimode base station |
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| CN102215559A (en) * | 2010-04-09 | 2011-10-12 | 上海华为技术有限公司 | Method for obtaining external clock signal by multimode base station and multimode base station |
| CN102237941A (en) * | 2010-04-28 | 2011-11-09 | 中兴通讯股份有限公司 | Time synchronization system and method |
| CN102468898A (en) * | 2010-11-19 | 2012-05-23 | 中兴通讯股份有限公司 | Method, equipment and system for achieving time synchronization in time division multiplexing network |
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