CN201114049Y - Digital remote system and its terminal time-delay unit - Google Patents
Digital remote system and its terminal time-delay unit Download PDFInfo
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- CN201114049Y CN201114049Y CNU200720057429XU CN200720057429U CN201114049Y CN 201114049 Y CN201114049 Y CN 201114049Y CN U200720057429X U CNU200720057429X U CN U200720057429XU CN 200720057429 U CN200720057429 U CN 200720057429U CN 201114049 Y CN201114049 Y CN 201114049Y
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Abstract
The utility model mainly relates to a digital zooming-out system, consisting of a server and at least two networks taking the optical fiber as the transmission medium between terminals. A time delay parameter is preset by a given structure; the calibration is realized by implementing the data time delay to ensure that the data transmission time between each terminal and the server is equal to the time delay parameter. The setting of the time delay parameter has the automatic way and the manual way. In the aspect of structure, corresponding calibration module is arranged between the server and the terminal. The method and the system realized by an optical fiber time delay calibration technique provided by the utility model effectively solve the problem of the co-channel interference, have certain flexibility and perfect the application of the digital zooming-out system.
Description
[technical field]
The utility model belongs to the mobile communication technology field, and the processing method when relating to digital data transmission in the mobile communication relates in particular to a kind of digital remote system and terminal delay unit thereof.
[technical background]
In mobile communication product is used, traditional digital optical fiber direct station only support point to the communication mode of point type, cover demand for satisfying enough mobile communication, just need set up more base station, this makes transformation, upgrading and the replacement of whole sub-district covering system become and bothers very much.And, make and set up the cost raising that the sub-district covers, increased the input of operator greatly.The applied environment and the scope of digital optical fiber direct station have greatly been limited based on this reason.In this case, use with regard to needing to use the digital RF far-drawing system that to support star-like daisy chain mixed networking mode to carry out engineering.
Digital RF far-drawing system is made up of digital access control unit (DAU:Data Access Control Unit) and digital radio frequency far-pulling unit (DRU:Data Remote RF Unit), be a kind of direct coupling base station signal, adopt a kind of covering solution of digital intermediate frequency transmission means.Based on the Optical Fiber Transmission that adopts digital if technology, the shortcoming of the signal-to-noise ratio degradation of signal when overcoming the analog optical fiber transmission, have dynamic greatly, low noise advantage, and on the basis of digital intermediate frequency, can develop multiple function, such as star-like daisy chain mixed networking form.See also shown in Figure 1 about this application form.
Under this application form, because there is time delay in the transmission of optical fiber, cause the different digital Remote Radio Unit under the same digital access control unit and the communication delay of this numeral access control unit all to have nothing in common with each other, can produce certain influence the transmission of signal.
Be difficult to avoid two different digital radio frequency far-pullings unit that the same area is covered during as shown in Figure 2, owing to practical engineering application.At this moment, when travelling carriage (MS:Mobile Station) is in two stations and covers intersection and especially be in the midpoint of two digital Remote Radio Unit DRU, when the transmission received power of mobile station MS was little for two digital radio frequency far-pulling cells D RU difference, the up-downgoing path of mobile station MS had two: A path that indicates with chain-dotted line and the B path that indicates with dash line.During practical application, during as employing 1310nm optical wavelength, single mode fiber communications, every 1km optical fiber can produce about 5us time delay.So, when being 10km, can produce the delay inequality of 50us between A path and the B path as if the optical fiber between DRU# 1 and the DRU#2.In this case, when up, digital access control cells D AU can receive from the different same signals constantly of same mobile station MS, promptly constitutes co-channel interference.Because digital access control cells D AU is coupled to base station (not shown), and the homogenous frequency signal that the base station can't demodulate reception be arrived will be thought it to disturb.Because normal signal of communication power much larger than aerial electromagnetic interference, makes digital access control cells D AU bigger to the level of interference that the base station produces.In like manner, when descending, mobile station MS receives different homogenous frequency signals constantly, and it can't normally be switched, and causes situation about can't converse.
Therefore, especially need the digital RF far-drawing system under the star-like daisy chain mixed networking is carried out the optical-fiber time-delay calibration.
[utility model content]
First purpose of the present utility model will overcome above-mentioned deficiency exactly, provides a kind of digital remote system at the digital remote system of star-like daisy chain mixed networking, occurs with the situation of avoiding the co-channel interference under this kind networking model.
Second purpose of the present utility model is to provide a kind of digital remote system terminal delay unit, so that the time delay calibrating method for optical fiber of digital remote system occurs with the form of more simplifying, is more convenient for implementing.
Corresponding each purpose of the present utility model is achieved by the following technical solution:
Digital remote system of the present utility model, comprise service end and at least two terminal of networking with it, service end and terminal are equipped with communication module, each communication module of service end connects a daisy-chain communication link that comprises at least one terminal, be that transmission medium is connected between the communication module separately of service end and client, client and client and forms star/daisy chain/star daisy chain hybrid network with optical fiber, wherein:
Described service end comprises system's time-delay calculation module, and each communication module electric connection with service end receives the interim delay value that each communication module is transmitted the affiliated communication link that comes, and selects the maximum delay value and is broadcast to each terminal as delay parameter;
Described terminal comprises
The Time delay measurement module, electrically connect with communication module, measure the delay value between current terminal and previous stage terminal or the service end, and the interim delay value stack of the back one-level terminal that will receive, send to previous stage terminal or service end as new interim delay value;
Directly the time-delay computing module electrically connects with communication module, and matches with system's time-delay calculation module of service end, calculates current terminal to the direct delay value between the service end;
Automatic control module electrically connects with communication module, calculate the delay parameter that from system broadcasts, receives with from the time-delay difference between the direct delay value of direct time-delay computing module acquisition;
The signal lag module is implemented time-delay to the data of communication module and is sent, and concrete amount of delay is the time-delay difference.
Further, each terminal also comprises:
Manual control module provides the interface with terminal equipment, manually set the time-delay difference by terminal equipment, and the difference of should delaying time transfers to described signal lag module;
The time-delay mode is selected module, and the interface with terminal equipment is provided, and selects to set between manual control module and signal lag module path and automatic control module and signal lag module path by terminal equipment.
When described service end can be digital access control unit, described terminal was the digital radio frequency far-pulling unit.
When described service end can be Base Band Unit, described terminal was a Remote Radio Unit.
When described service end can be the repeater, described terminal was the antenna radio frequency unit.
The described Time delay measurement module and the computing module of directly delaying time are integrated into same module jointly.
Digital remote system terminal delay unit of the present utility model comprises:
Directly the time-delay computing module electrically connects with communication module, and matches with system's time-delay calculation module of service end, calculates current terminal to the direct delay value between the service end;
Manual control module provides the interface with terminal equipment, manually sets delay parameter by terminal equipment;
Computing module calculates the time-delay difference between this delay parameter and the described direct delay value;
The signal lag module is implemented time-delay to the data of communication module and is sent, and concrete amount of delay is the difference of manual control module computing gained.
Compared with prior art, the utility model possesses following advantage: the utility model is convenient to design outer application circuit with programmable logic device and is realized, so escapable cost, is convenient to use; More importantly, by the uplink and downlink signals of each terminal being made the time-delay of distinct program, make in the whole digital remote system all terminal for the time-delay unanimity of service end, thereby make service end think that the distance of all terminal is all identical, solved the problem of co-channel interference effectively; Simultaneously, the utility model also can be according to actual needs, and the time delay value of manually setting each terminal is to adapt to some special applied environments.
[description of drawings]
Fig. 1 is the star-like daisy chain networking mode schematic diagram of known digital RF far-drawing system;
Fig. 2 is in the digital RF far-drawing system, and overlapping schematic diagram appears in two terminal overlay areas;
Fig. 3 is the disclosed optical-fiber time-delay measuring circuit of a CN1897475 patent documentation theory diagram;
The time delay overview distribution map of Fig. 4 when to be the utility model use in star-like daisy chain mixed networking system;
Fig. 5 is the theory diagram of the service end of the utility model digital remote system;
Fig. 6 is the theory diagram of the terminal of the utility model digital remote system.
[embodiment]
Below in conjunction with drawings and Examples the utility model is further described:
Digital remote system described in the utility model, the various digital remote systems that transmit with optical fiber of logical finger, include but not limited to: with the digital RF far-drawing system of digital access control unit and the networking of digital radio frequency far-pulling unit, repeater far-drawing system with repeater and the networking of antenna radio frequency unit, with base station zoom out system of baseband pool and RF remote unit networking etc., those of ordinary skill can this type of be characterized as the basis in the field, just can know the utility model by inference without creative work and be equally applicable to suchlike digital remote system, therefore, any based on the utility model simple modification or be equal to replacement, should be considered as not exceeding spiritual institute of the present utility model restricted portion.
For simplifying description of the present utility model, the utility model will disclose various embodiment of the present utility model in conjunction with the accompanying drawings based on digital RF far-drawing system.
Quoted the CN1897475 patent disclosure in the utility model, it relates to a kind of optical-fiber time-delay measuring method and circuit, and Fig. 3 shows its schematic block circuit diagram, please in conjunction with the CN1897457 patent, its realization principle and detailed process is given unnecessary details not all right herein.
By the CN1897475 patent as can be known, this optical-fiber time-delay measuring circuit mainly comprises near-end circuit and remote circuitry, but by cooperatively interact fiber delay time value between two communication modules of accurate Calculation of near-end circuit and remote circuitry.In the utility model, take notional legibility into account, above-mentioned near-end circuit is summarised as direct time-delay computing module, be used for electrically connecting with communication module; And the said distal ends circuit is integrated in system's time-delay calculation module of following service end, no longer row is given unnecessary details.
See also Fig. 4, digital remote system of the present utility model comprises digital access control cells D AU and several the digital radio frequency far-pulling cells D RU# 1 as terminal as service end, DRU# 2, DRU# 3, wherein, digital radio frequency far-pulling cells D RU# 1 and DRU# 2 connect in the mode of daisy chain (bus) and electrically connect with digital access control cells D AU, form chrysanthemum chain communication link A, certainly, also can form a plurality of these type of communication links, specifically the communication module by digital access control cells D AU limits, the then single and digital access control cells D of digital radio frequency far-pulling cells D RU# 3 AU electrically connects, and also forms the chrysanthemum chain communication link B that a node is only arranged.Thus, just form star topology on the whole digital access control unit, make whole system be star-like chrysanthemum chain mixed networking mode with two chrysanthemum shape communication links.This kind mode is comparatively commonly used, but be not only option, can be in the practice with a plurality of digital radio frequency far-pulling cells D RU# 1, DRU# 2, DRU# 3 one tunnel series connection back forms simple daisy chain network topology with digital access control DAU unit, also the three directly can be electrically connected with digital access control cells D AU separately respectively and form simple hub-and-spoke network topology, be determined on a case-by-case basis.
No matter simple hub-and-spoke network topology, or daisy chain network topology, or be star-like daisy chain hybrid network topology, each is as the digital radio frequency far-pulling cells D RU# 1 of terminal, DRU# 2, the DRU# 3 distance is generally different as the size of the digital access control cells D AU of service end, so its optical-fiber time-delay difference.Comprise time delay A1 and A2 as communication link A among Fig. 4, communication link B then only comprises time delay 3, and generally each is unequal for each section time delay A1, A2, B '.
Therefore the utility model discloses a kind of time delay calibrating method for optical fiber, and is as follows in detail:
For overcoming the situation of co-channel interference as shown in Figure 2, be required to be the default delay parameter of digital remote system, make each digital radio frequency far-pulling cells D RU# 1, DRU# 2, DRU# 3 delays time to the up-downgoing data, and the transmission overall delay of up-downgoing data is equated with this delay parameter, thereby guarantees each digital radio frequency far-pulling cells D RU# 1, DRU# 2, DRU# 3 is all equal to the data transmission period between the digital access control cells D AU.
Among Fig. 4, the overall delay of communication link A is A '=A1+A2, and the overall delay of communication link B is B '.For making system optimal, described delay parameter should equate with delay time the maximum of numerical value { A ', B ' } among communication link A and the B.If if A1+A2＞B ', delay parameter S=MAX{A ' then, B ' }.Again with delay parameter S broadcast distribution to each digital radio frequency far-pulling cells D RU# 1, DRU# 2 is among the DRU#3.This delay parameter should be less than MAX{A ', B ' }, otherwise, will there be at least one terminal such as DRU# 2 the abnormal situation of communication to occur, therefore, suitably improving delay parameter S is one of option.
Be convenient to revise delay parameter S for making the user, need at digital radio frequency far-pulling cells D RU# 1, DRU# 2, DRU# 3 provides optional manual set-up mode, the interface that provides at least one to be connected with the terminal equipment of computer and so on, the user can be made amendment, to adapt to some special applied environments by special-purpose software to this delay parameter.
Therefore, at the digital radio frequency far-pulling cells D RU# 1 that uses as terminal, DRU# 2, among the DRU# 3, at first measure the direct delay value T1 between itself and the terminal, utilize the delay parameter S and the T1 that from system broadcasts, obtain to subtract each other acquisition time-delay difference T then, be T=S-T1, utilize this time-delay difference T that the up-downgoing data are implemented delay calibration, because S is set, so T is variable, at each digital radio frequency far-pulling cells D RU# 1, DRU# 2, DRU# 3 does the time-delay of corresponding time-delay difference T to the up-downgoing data, can guarantee that on the contrary each terminal D RU is to the identical time delay between the service end DAU.
Flexibility for adaptive system, also can manually carry out the direct setting of described time-delay difference T to indivedual or all terminal D RU, but not delay parameter S is set, and so just needn't carry out special computing by each terminal D RU, directly execute time-delay factually and get final product with this time-delay difference T logarithm.But require this moment computer software to shift to an earlier date the various data of gathering system, to allow operating personnel draw the time-delay difference T of science.
Among each terminal D RU, obtain direct delay value T1 and be near-end circuit by aforementioned CN1897475 patent application and remote circuitry and cooperate and realize that wherein the near-end circuit is integrated in terminal D RU inside, remote circuitry then is integrated among the service end DAU.For fragment delay value between adjacent two terminals such as DRU# 1 and the DRU# 2 such as the measurement of A1 and A2, then by nearly terminal circuit and remote circuitry place two terminal D RU# 1 and DRU# 2 to realize respectively, also be, this is symmetrical structure for near-end circuit and remote circuitry, therefore, mutual two such circuit cooperate and just can realize the optical-fiber time-delay between it is accurately measured.
When described delay parameter S was obtained automatically by system, each terminal D RU need report each concrete time delay to service end DAU, so that service end DAU finally can obtain suitable delay parameter S.Therefore, service end DRU need follow following steps and produce this delay parameter S automatically:
1), current terminal such as digital Remote Radio Unit DRU# 2 calculate thereafter the one-level terminal (this moment are because digital radio frequency far-pulling cells D RU# 2 is an end node, the interim delay value that the transmission of back one-level comes is 0) delay value A2 sum between the interim delay value that comes of transmission and itself and the previous stage terminal D RU# 2, this and value Sum=A2+0 are transmitted to the previous stage terminal D RU# 1 of current terminal D RU# 2 as delay value temporarily;
2), terminal D RU# 1 then terminal D RU# 2 transmission is come and value Sum and itself and service end between delay value A1 addition, the overall delay that finally draws communication link A is A '=A1+A2;
3), because communication link B a node is only arranged because its overall delay promptly equals the direct delay value between service end DAU and the terminal D RU# 3, be B '.
4), at this moment, service end DAU obtains a set about interim delay value, i.e. { A ', B ' } promptly can be used as described delay parameter by the aforementioned maximum S that obtains in this set, and is broadcast in each terminal and stores.
For the user manually or is automatically being switched between the control, the utility model also provides corresponding interface, makes the user utilize software to select between dual mode by the terminal setting of computer and so on.
In order to realize the above-mentioned optical-fiber time-delay Calibration Method of carrying out, the utility model also discloses a kind of digital remote system, please in conjunction with Fig. 5 and shown in Figure 6, it adopts the utility model structure shown in Figure 4, state preceding about its structure, its main improvement is to carry out in as the digital access control cells D AU of service end and the digital radio frequency far-pulling cells D RU as terminal.Specific as follows:
Described service end DAU comprises system's time-delay calculation module 11, this system's time-delay calculation module 11 is integrated remote end module (or the local module of above-mentioned known optical-fiber time-delay measuring circuit, not shown), each communication module A of whole system time-delay calculation module 11 and service end DAU, B, C electrically connects, the corresponding communication link of communication module is so that receive each communication module A, B, the pairing communication link of C transmits the interim delay value of the affiliated communication link that comes, abide by said method, select maximum delay value MAX{A ', B ' pass through each communication module A as delay parameter S, B, C are broadcast to each terminal D RU.In Fig. 4, mainly show as and be broadcast to digital long-drawn control unit DRU# 1, DRU# 2 is among the DRU# 3.
In order to cooperate method of the present utility model, described terminal D RU comprises:
Time delay measurement module 21, electrically connect with the communication module 22 of current terminal D RU, measure current terminal D RU and previous stage terminal (when previous stage is terminal, then measure current terminal and service end) between delay value, and the interim delay value stack of the back one-level terminal that will receive, send to previous stage terminal or service end DAU as new interim delay value, this module 21 has realized the scheme of areal survey optical-fiber time-delay;
Directly the time-delay computing module 23, it is the local module (or remote end module) of above-mentioned known optical-fiber time-delay measuring circuit, be connected between communication module 22 and the automatic control module 24, and match with system's time-delay calculation module 11 of service end DAU, calculate current terminal to the direct delay value between the service end DAU.Herein also can be above-mentioned the identical mode of Time delay measurement module 21, realize in the mode of areal survey;
Automatic control module 24, electrically connect with communication module 22, calculate the time-delay difference between the direct delay value of the delay parameter S that from system broadcasts, receives and acquisition from direct time-delay computing module 23 by communication module 22, the concrete time-delay difference that should postpone as the up-downgoing data with this difference of delaying time;
Signal lag module 25 is implemented time-delay to the data of communication module 22 and is sent, and these class data comprise the up-downgoing data, and concrete amount of delay is described time-delay difference.
Optical fiber is as transmission medium, and known ground is connected in service end DAU and terminal D RU, perhaps between the communication module separately of terminal and terminal, to realize the wired connection of whole system.
Thus, as shown in Figure 4, terminal D RU, service end DAU have realized the interconnected of particular network topology by optical fiber, and realized the logical construction of above-mentioned time delay calibrating method for optical fiber, so, the technical solution of the utility model has more practicality, can directly apply in the specific product.
Further, in order to realize in the said method function being set manually, terminal D RU of the present utility model also comprises:
The time-delay mode is selected module 27, and the interface with the terminal equipment of computer and so on is provided, and selects to set between manual control module 26 and signal lag module 25 paths and automatic control module 24 and signal lag module 25 paths by terminal equipment.
Like this, when selecting to use the mode that manually is provided with, the delay value that current terminal is implemented the up-downgoing data is just determined with the time-delay difference of manual setting, realizes indivedual possibilities of adjusting, and goes for indivedual concrete operational environments.
As described above, digital remote system of the present utility model is widely used, particularly:
When described service end DAU is digital access control unit, described terminal is the digital radio frequency far-pulling unit.
When described service end DAU is a Base Band Unit, described terminal is a Remote Radio Unit.
When described service end DAU is the repeater, described terminal is the antenna radio frequency unit.
Be simplified design, the described Time delay measurement module 21 and the computing module 23 of directly delaying time can be integrated into same module (not shown) jointly.
In addition, for ease of manual mode is provided, the utility model also discloses digital remote system terminal delay unit (not shown), comprising:
Directly the time-delay computing module electrically connects with communication module, and matches with system's time-delay calculation module of service end, calculates current terminal to the direct delay value between the service end;
Manual control module provides the interface with terminal equipment, manually sets delay parameter by terminal equipment;
Computing module calculates the time-delay difference between this delay parameter and the described direct delay value;
The signal lag module is implemented time-delay to the data of communication module and is sent, and concrete amount of delay is the time-delay difference of computing module computing gained.
The proposition of this unit although function is simple, has been simplified design.
To sum up, the method and system that the optical-fiber time-delay collimation technique that the utility model provides is realized has effectively overcome the problem of co-channel interference, makes the application of digital remote system more attain perfect.
Claims (7)
1, a kind of digital remote system, comprise service end and at least two terminal of networking with it, service end and terminal are equipped with communication module, each communication module of service end connects a daisy-chain communication link that comprises at least one terminal, be that transmission medium is connected between the communication module separately of service end and client, client and client and forms star/daisy chain/star daisy chain hybrid network with optical fiber, it is characterized in that:
Described service end comprises system's time-delay calculation module, and each communication module electric connection with service end receives the interim delay value that each communication module is transmitted the affiliated communication link that comes, and selects the maximum delay value and is broadcast to each terminal as delay parameter;
Described terminal comprises
The Time delay measurement module, electrically connect with communication module, measure the delay value between current terminal and previous stage terminal or the service end, and the interim delay value stack of the back one-level terminal that will receive, send to previous stage terminal or service end as new interim delay value;
Directly the time-delay computing module electrically connects with communication module, and matches with system's time-delay calculation module of service end, calculates current terminal to the direct delay value between the service end;
Automatic control module electrically connects with communication module, calculate the delay parameter that from system broadcasts, receives with from the time-delay difference between the direct delay value of direct time-delay computing module acquisition;
The signal lag module is implemented time-delay to the data of communication module and is sent, and concrete amount of delay is the time-delay difference.
2, digital remote system according to claim 1 is characterized in that: each terminal also comprises:
Manual control module provides the interface with terminal equipment, manually set the time-delay difference by terminal equipment, and the difference of should delaying time transfers to described signal lag module;
The time-delay mode is selected module, and the interface with terminal equipment is provided, and selects to set between manual control module and signal lag module path and automatic control module and signal lag module path by terminal equipment.
3, digital remote system according to claim 1 and 2 is characterized in that: described service end is digital access control unit, and described terminal is the digital radio frequency far-pulling unit.
4, digital remote system according to claim 1 and 2 is characterized in that: described service end is a Base Band Unit, and described terminal is a Remote Radio Unit.
5, digital remote system according to claim 1 and 2 is characterized in that: described service end is the repeater, and described terminal is the antenna radio frequency unit.
6, digital remote system according to claim 1 and 2 is characterized in that: the described Time delay measurement module and the computing module of directly delaying time are integrated into same module jointly.
7, a kind of digital remote system terminal delay unit is characterized in that comprising:
Directly the time-delay computing module electrically connects with communication module, and matches with system's time-delay calculation module of service end, calculates current terminal to the direct delay value between the service end;
Manual control module provides the interface with terminal equipment, manually sets delay parameter by terminal equipment;
Computing module calculates the time-delay difference between this delay parameter and the described direct delay value;
The signal lag module is implemented time-delay to the data of communication module and is sent, and concrete amount of delay is the difference of manual control module computing gained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNU200720057429XU CN201114049Y (en) | 2007-09-25 | 2007-09-25 | Digital remote system and its terminal time-delay unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU200720057429XU CN201114049Y (en) | 2007-09-25 | 2007-09-25 | Digital remote system and its terminal time-delay unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098080A (en) * | 2009-12-09 | 2011-06-15 | 京信通信***（中国）有限公司 | Digital microwave radio remote unit coverage system and method |
| CN101399599B (en) * | 2007-09-25 | 2013-02-27 | 京信通信***（中国）有限公司 | Digital remote system and time delay calibrating method for optical fiber |
| CN103532629A (en) * | 2012-07-05 | 2014-01-22 | 京信通信技术(广州)有限公司 | Method and device for improving uplink time delay adjustment of digital optical fiber repeater |
| CN110493671A (en) * | 2019-08-07 | 2019-11-22 | 京信通信***（中国）有限公司 | The acquisition methods and device of time delay adjusted value |
-
2007
- 2007-09-25 CN CNU200720057429XU patent/CN201114049Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399599B (en) * | 2007-09-25 | 2013-02-27 | 京信通信***（中国）有限公司 | Digital remote system and time delay calibrating method for optical fiber |
| CN102098080A (en) * | 2009-12-09 | 2011-06-15 | 京信通信***（中国）有限公司 | Digital microwave radio remote unit coverage system and method |
| CN103532629A (en) * | 2012-07-05 | 2014-01-22 | 京信通信技术(广州)有限公司 | Method and device for improving uplink time delay adjustment of digital optical fiber repeater |
| CN110493671A (en) * | 2019-08-07 | 2019-11-22 | 京信通信***（中国）有限公司 | The acquisition methods and device of time delay adjusted value |
| CN110493671B (en) * | 2019-08-07 | 2022-03-25 | 京信网络***股份有限公司 | Method and device for acquiring time delay adjustment value |
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