CN101938827B - TD-SCDMA format Femtocell air interface synchronization method - Google Patents
TD-SCDMA format Femtocell air interface synchronization method Download PDFInfo
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Abstract
The invention relates to the technical field of wireless communication, in particular to a TD-SCDMA format Femtocell air interface synchronization method, which comprises the following steps: 1, acquiring a corresponding macro base station neighbor list through an accessed Femto gateway; 2, sequencing the neighboring macro base stations in the macro base station neighbor list, and selecting a macro base station of which the signal quality is high as a synchronous signal source base station if initial synchronous access; 3, performing initial synchronous access by means of two-stage synchronization, wherein rough synchronization is performed by characteristic window matching at the first stage and fine synchronization is performed by filter related detection at the second stage, so that the initial synchronous access can be accomplished quickly; and 4, periodically detecting the synchronous signal source base station, computing self frequency error, correcting the frequency error by using the time regulating unit to maintain the synchronization, and monitoring if the synchronous signal source base station steps out at the same time. In the method, the synchonizaiton cost is low; and the synchronization requirement for the indoor application of a large batch of FemtoCells can be met on the premise of low cost.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of method of the FemtoCell air interface synchronization for the TD-SCDMA standard.
Background technology
In the 3G epoch, FemtoCell has obtained the extensive approval of operator for the effect that solves indoor covering, the same with conventional macro base station, realize that the most important technology of the commercial deployment of FemtoCell is exactly the stationary problem of how realizing between the huge FemtoCell base station of quantity, in case step-out, will cause that strong signal disturbs, the cellphone subscriber at all can't access network when serious.Operator mainly contains following several scheme for solving base station synchronization at present.
1, based on the synchronization solutions of GPS
For realizing the synchronizing function of base station, the GPS receiver needs to receive 4 satellite-signals at least, to realize accurate clock synchronous.The external GPS in base station carries out synchronous mode and is easier to realize at outdoor ratio, only needs to erect a television antenna in the place that is easy to receive gps signal, gps signal is introduced the base station get final product.This method of synchronization does not need the whole network synchro system, does not need to take transfer resource, and synchronization accuracy is high.
This method of synchronization has two bottlenecks on cost and the project installation to FemtoCell: at first on cost, operator has explicitly pointed out the acceptable cost requirement of FemtoCell below thousand yuan at present, more low better, it is obviously unrealistic that each FemtoCell mixes a high-precision GPS receiver; Secondly on project installation, indoor environment Satellite signal in most cases can't satisfy the requirement that searches 4 satellites.Therefore, this method of synchronization remains to be discussed in FemtoCell uses.
2, based on the synchronization solutions of synchronous ethernet
The synchronous ethernet technology is a kind of technology that adopts ethernet link code stream recovered clock.Use high-precision clock to send data at ether interface, recover and extract this clock at receiving terminal, can keep high-precision clock performance.Synchronous ethernet (based on ITU-T G.8261) does not affect the form of existing IEEE802.3, extract synchronised clock from physical layer, but this technology only all possesses in the situation of synchronous ethernet characteristic at bearer network equipment, could provide synchronised clock for the base station.
This method of synchronization requires each node of IP bearer network to support the synchronous ethernet characteristic, and network architecture is required height, therefore, certain limitation is arranged.
3, based on the synchronization solutions of IEEE1588
The basic conception of IEEE1588 system is: each node on the network has the clock of oneself, and these clocks will be synchronized on the master clock of system.Sync interval normally 1,2,8,16 and 64 second oversizely then can not guarantee enough synchronization accuracies, too shortly then can increase the Internet Transmission burden.
This method of synchronization is only applicable to use under routing node is less in the middle of the bearer network, shake the is little network condition.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method of the FemtoCell air interface synchronization for the TD-SCDMA standard is provided, the method stepped cost is low, is conducive to satisfying the synchronous requirement of FemtoCell in enormous quantities when indoor environment is used under the prerequisite cheaply.
For achieving the above object, technical scheme of the present invention is:
1, a kind of method of the FemtoCell air interface synchronization for the TD-SCDMA standard is characterized in that: may further comprise the steps:
(1) after FemtoCell powered on for the first time, the Femto gateway by access obtained quantity, frequency, the codeword information of peripheral macro base station, generates corresponding macro base station Neighboring Cell List;
(2) adjacent macro base station in the macro base station Neighboring Cell List is sorted, select the best macro base station of signal quality wherein as the synchronous information source base station of initial synchronisation access;
(3) adopt the two-stage method of synchronization to carry out the initial synchronisation access, it is synchronously thick that the first order adopts the Window coupling to carry out, and it is synchronously thin that the second level adopts the matched filter coherent detection to carry out, to finish fast the initial synchronisation access;
(4) periodically detect synchronous information source base station, calculate the frequency error of self, by the time adjustment unit, the correction of frequency error to keep synchronously, is monitored whether step-out of synchronous information source base station simultaneously.
The invention has the beneficial effects as follows that this synchronization scenario cost is low, easy to use, can satisfy the synchronous requirement of FemtoCell in enormous quantities when indoor environment is used under the prerequisite cheaply.In addition, this synchronization scenario does not require the change existing network infrastructure, can not increase network burden yet, can be widely used at the FemtoCell that is used for the TD-SCDMA standard.
Description of drawings
Fig. 1 is the workflow diagram of the embodiment of the invention.
Fig. 2 is TD-SCDMA frame structure schematic diagram.
Fig. 3 is the corresponding relation figure between each code word in the embodiment of the invention.
Fig. 4 is the network architecture figure of FemtoCell in the embodiment of the invention.
Fig. 5 is the division schematic diagram of Route Area RA in the embodiment of the invention.
Fig. 6 is the time delay schematic diagram of the embodiment of the invention.
Fig. 7 is the thick synchronously flow chart of the Window coupling of the embodiment of the invention.
Fig. 8 is the moment position view of SYNC_DL in the embodiment of the invention.
Fig. 9 is the workflow diagram of synchronous maintenance stage in the embodiment of the invention.
Embodiment
The method of the FemtoCell air interface synchronization for the TD-SCDMA standard of the present invention may further comprise the steps:
(1) after FemtoCell powered on for the first time, the Femto gateway by access obtained quantity, frequency, the codeword information of peripheral macro base station, generates corresponding macro base station Neighboring Cell List.FemtoCell utilizes the macro base station Neighboring Cell List of knowing, frequency, the code word of only searching for limited quantity also can preset certain certain base station and carry out synchronously, thus synchronous computing amount of calculation and the lock in time of effectively having reduced the initial synchronisation access procedure.
(2) adjacent macro base station in the macro base station Neighboring Cell List is sorted, select the best macro base station of signal quality wherein as the synchronous information source base station of initial synchronisation access.
(3) adopt the two-stage method of synchronization to carry out the initial synchronisation access, it is synchronously thick that the first order adopts the Window coupling to carry out, and it is synchronously thin that the second level adopts the matched filter coherent detection to carry out, to finish fast the initial synchronisation access.By the two-stage method of synchronization, under the prerequisite that does not reduce synchronization accuracy, significantly improve the synchronously speed of search.
(4) periodically detect synchronous information source base station, calculate the frequency error of self, by the time adjustment unit, the correction of frequency error to keep synchronously, is monitored whether step-out of synchronous information source base station simultaneously.
In step (1), the FemtoCell network is divided into a plurality of Route Area RA, the range of management of the corresponding macro base station of each RA scope, allow overlapping between the RA, even a Femto gateway belongs to a plurality of RA, FemtoCell accesses its corresponding Femto gateway by the fixed network resource, know its residing RA lane place, because the lane place of RA lane place and macro base station is one to one, so after a FemtoCell powers on, pass through the authentication access network, near the concrete quantity of macro base station obtaining, frequency and code word generate corresponding macro base station Neighboring Cell List.
In step (2), because FemtoCell does not also finish the initial synchronisation access, can't measure each adjacent macro base station signal through signal strength signal intensity and the signal quality of aerial path loss arrival when being in, the foundation that sorts this time mainly is to rely on time delay, the Femto gateway is measured the time delay that arrives each macro base station in the macro base station Neighboring Cell List from Femto through core net, pass through calculation delay, upgrade the macro base station Neighboring Cell List of Femto gateway, make the macro base station of time delay minimum come first of macro base station Neighboring Cell List, with the synchronous information source base station as the initial synchronisation access; When a FemtoCell accesses the Femto gateway of its correspondence by the fixed network resource, just can download from the Femto gateway this macro base station Neighboring Cell List, with the synchronous information source base station of the first macro base station in Neighboring Cell List place as the initial synchronisation access phase.
After FemtoCell finishes the initial synchronisation access, monitoring receives the signal quality of each macro base station, select the wherein best macro base station conduct of signal quality to keep synchronous synchronous information source base station, perhaps select a plurality of base stations as synchronous information source base station, and will with the average result of each synchronous information source base station synchronization as reference synchronization.
FemtoCell detects the synchronous situation of relevant macro base station in the normal synchronized maintenance process, then automatically change synchronous information source base station when finding certain macro base station step-out, and report and alarm information is to the Femto gateway, and personnel keep in repair the macro base station that the step-out fault occurs with the notice O﹠M.
FemtoCell comprises sync search unit, after working on power as FemtoCell, by related operation, realizes fast the clock synchronous with peripheral information source macro base station.
FemtoCell also further comprises:
Updating block is used for after FemtoCell finishes the initial synchronisation access synchronously, by the synchronous update time of presetting, is updated periodically the synchronous of FemtoCell.
The frequency offset calculation unit is for detection of the frequency error of FemtoCell in cycle time self clock circuit;
The time adjustment unit after knowing corresponding frequency error, is corrected the frequency error of FemtoCell self clock by the clock Circuit tuning.
The present invention is described in further detail below in conjunction with accompanying drawing.
In technical scheme of the present invention, FemtoCell is undertaken can being divided into three phases synchronously by air interface, is respectively preproduction phase, initial synchronisation access phase and synchronous maintenance stage.
1, the preproduction phase
Preproduction phase refers to the moment after FemtoCell has just begun to power on, and this stage F emtoCell does not also begin synchronous search, is the clock circuit work that relies on self, does not provide professional to the user.The main task of preproduction phase is known the residing lane place of FemtoCell exactly, obtains the quantity of peripheral macro base station, frequency, and the information such as code word are for initial synchronisation access phase and the synchronous maintenance stage of next stage.
At first need to understand the frame structure of TD-SCDMA uniqueness, as shown in Figure 2.
Each TD-SCDMA subframe is divided into 7 conventional time slots and 3 special time slots that length is 675us.These three special time slots are respectively DwPTS (descending pilot frequency time slot), GP (protection time slot) and UpPTS (uplink pilot time slot).Descending pilot frequency time slot (DwPTS) is as descending pilot frequency and design synchronously.This time slot is that the SYNC_DL sequence of 64chips and length are that the protection interval of 32chips forms by length.
SYNC_DL is one group of PN code, is used for distinguishing neighbor cell, and different SYNC_DL is used in different residential quarters, and associated process is determining of down-going synchronous, code identification and P-CCPCH channel.Also without scrambling, the user directly carries out coherent detection to SYNC_DL without spread spectrum, realizes synchronously.Base station of a SYNC_DL unique identification and a code character, each code character comprises 4 specific scramblers, the corresponding specific basic midamble code of each scrambler, the corresponding relation between each code word is as shown in Figure 3.
Traditional related synchronization method is that the data of whenever receiving a chip by the user just carry out related calculation with 32 possible SYNC_DL, which SYNC_DL to find out current base station employed, because 32 possible SYNC_DL are arranged, each SYNC_DL length is 64chip, so whole TD-SCDMA subframe 6400chip is directly carried out related calculation, and then the amount of calculation of each second is:
32*64*6400*200=2621M (64 is SYNC_DL length, and 200 is the inverse of TD-SCDMA period of sub-frame)
Support huge operand like this, need polycaryon processor very at a high speed to be competent at, but these devices are expensive, and power consumption is very large, is not suitable for obviously this equipment very responsive to the cost power consumption of FemtoCell.The simultaneous techniques that can effectively reduce the related synchronization operand is only the FemtoCell air interface synchronization technology of real commercial value.
Different with traditional base station is, what FemtoCell adopted is not the special-purpose access network resources such as E1, but the fixed network resource of employing fixed broadband is backhaul, a plurality of FemtoCell converge the base station data to the Femto gateway, by the Iu interface core network access of standard, the network architecture of FemtoCell is as shown in Figure 4 again for the Femto gateway.
Because the transmitting power of FemtoCell is low, area coverage is only limited to the indoor environment in 100 squares mostly, all FemtoCell area coverages when practical application under Femto gateway macro base station of making peace greatly is suitable, and the mounting arrangements of FemtoCell mainly is blind for indoor benefit, and it is nonsensical opening FemtoCell in the outdoor place that does not have a macro base station signal.When the FemtoCell network planning, can consider the FemtoCell network is divided into a plurality of Route Areas (RA), the range of management of the corresponding macro base station of each RA scope, allow overlapping between the RA, namely a Femto gateway can belong to a plurality of RA, in Fig. 5, this Femto gateway belongs to RAl, RA2 and three RA of RA3 simultaneously.Each Femto gateway stores the macro base station Neighboring Cell List, and the macro base station Neighboring Cell List of this Femto gateway just comprises (macro base station 1, macro base station 2, macro base station 3).
Macro base station Neighboring Cell List maximum is 16, in order further to reduce the operand of related synchronization, need to sort to adjacent macro base station in the Neighboring Cell List, only picks out the best macro base station of 1 signal quality as the synchronous information source base station of initial synchronisation access phase.Because at this moment FemtoCell does not also finish the initial synchronisation access, can't measure each adjacent macro base station signal through signal strength signal intensity and the signal quality of aerial path loss arrival when being in, the foundation that sorts this time mainly is to rely on time delay, the Femto gateway is measured the time delay that arrives each macro base station the Neighboring Cell List from the Femto gateway through core net, as shown in Figure 6, the computing formula of time delay total time Delay is: Delay=T1+T2+T3
Pass through calculation delay, upgrade the macro base station Neighboring Cell List that the Femto gateway goes out, the macro base station of Delay minimal time makes number one, when a FemtoCell accesses the Femto gateway of its correspondence by the fixed network resource, just can download from the Femto gateway this macro base station Neighboring Cell List, so after a FemtoCell powers on, pass through the authentication access network, near just knowing the concrete quantity of macro base station, frequency and code word, generate corresponding macro base station Neighboring Cell List, with the synchronous information source base station of the first macro base station in Neighboring Cell List place as the initial synchronisation access phase.
2, initial synchronisation access phase
At the initial synchronisation access phase, FemtoCell with first macro base station in the first-selected macro base station Neighboring Cell List as synchronous information source base station.This moment, SYNC_DL determined to only have one, and the operand of the traditional related synchronization before comparing is reduced to 1/32, but the amount of calculation of each second is still nearly 100,000,000, and computing formula is:
(64*6400*200=81.92M 64 is SYNC_DL length, and 200 is the inverse of TD-SCDMA period of sub-frame)
The processor chips operating frequencies such as at present common single-chip microcomputer, DSP mostly below 30MHz, obviously also need further to reduce operand.
(1) the Window coupling realizes synchronously thick
The TD-SCDMA system has just fully taken into account the problem of quick down-going synchronous at the design initial stage, specially DwPTS is designed to an independent time slot, and DwPTS does not participate in the figuration gain of smart antenna, the base station is always full power emission DwPTS, utilize the frame structure of this uniqueness, adopt the method for Window coupling, can estimate fast the approximate location of DwPTS by the power that detects down link signal.
The valid data length of TSO is 848 chip lengths (662.5us); the right side is the protection time slot of 16chip; the left side of DwPTS is the protection time slot of 32chip; so the protection interval between TSO and the DwPTS is 48 chip lengths (37.5us); the data width of DwPTS is 64 chips (50us); according to this feature, can estimate the approximate location of DwPTS on time domain in time domain by the thick simultaneous techniques of Window coupling.As shown in Figure 7, the RF-coupled circuit of FemtoCell inside extracts the radiofrequency signal coupling of part input, carry out detection by the power detection chip, the power signal of radio frequency is converted to voltage signal, this voltage signal is converted to digital signal by frequency overlapped-resistable filter by A/D, and then by processor (such as DSP etc.) sampled value is carried out analyzing and processing, by the feature of above-mentioned DwPTS time slot, judge the approximate location of DwPTS, finish thick synchronously flow process.
In order to accelerate thick synchronous speed, the cycle of being arranged to 8chip change-over time of A/D sampling, at high-speed comparator of processor chips inside programming, whenever after receiving a sampled data, first data are compared with prefabricated threshold values, data greater than threshold values are then exported " 1 ", otherwise then be " 0 ", high trigger signal of output when just in the end finish one " 1 " when the code stream of continuous wave output " 00000011111111 ", and enter the thin synchronous phase of the matched filter coherent detection of next stage.
(2) the matched filter coherent detection realizes synchronously thin
Synchronously thick by Window coupling, synchronization accuracy can reach 8chip, the precise synchronization why simultaneous techniques of Window coupling can not settle at one go by improving the sample rate realization, because aloft in the wireless environment, each TD-SCDMA macro base station signal that distance is different arrives the FemtoCell place and directly meets at together, Window can blur in the waveform detection of power detection chip output, and feature is not obvious, can't realize other precise synchronization of chip level.
The thin method for synchronous of matched filter coherent detection is consistent with aforesaid traditional related synchronization at algorithm, also be constantly to carry out related calculation with SYNC_DL by the bit stream data that will receive, can obtain a peak-data when both mate, what this moment was corresponding is the correct time position of DwPTS.
The thin method for synchronous of matched filter coherent detection that different is is at known SYNC_DL and realizes carrying out related operation under the thick synchronous prerequisite, consider the deviation of slightly synchronous 8chip, only need to begin related operation by (6400chip-64chip-8chip) * 0.78125us=4.952ms after realization is slightly synchronous, and only need to calculate the data of 64+8=72chip, the data volume of this moment is 64*72*200=0.922M (64 are SYNC_DL length, and 200 is the inverse of TD-SCDMA period of sub-frame).Less than the operand of 1M, task of only needing very cheap processor just can be competent at this synchronous computing.
Concrete simplify of arithmetic is:
For?i＝0；i＜＝71；i++；
Wherein, i: represent the original position of SYNC_DL, each circulation moves one (chip);
J: representative begins to pursue the sequence number that chip extracts from the original position of SYNC_DL;
Corresponding each sample value starting point i obtains a correlated series c (i), finds the starting point i value corresponding to that correlated series of maximum correlation peak, just correspondence the zero hour of DwPTS;
3, the synchronous maintenance stage
In the synchronous maintenance stage, FemtoCell is access network, can normally support various mobile services, but since the frequency deviation of self clock still need constantly to adjust, just can keep with large net synchronously.In the synchronous maintenance stage, the FemtoCell processor will constantly carry out various base band datas to be processed, and the Radio Resource allotment gets final product so only need to regularly upgrade synchronously in synchronous maintenance stage, according to the frequency stability of present common crystals, the update cycle of setting FemtoCell is 2S.Concrete workflow is shown in 9.
Synchronous updating block: the counter that it is 2S that a count cycle is contained in this inside, unit, when the full amplitude of counter, starting Timing Synchronization upgrades, what the initial synchronisation stage before was different is, maintenance stage FemtoCell is the RSCP that arrives the PCCPCH channel at this place by detecting each macro base station synchronously, C/I, according to signal quality, generate corresponding FemtCell information source macro base station tabulation, can select the wherein best macro base station conduct of signal quality to keep synchronous reference source, perhaps also can select a plurality of base stations as synchronisation source, and will with the average result of each base station synchronization as reference synchronization;
The frequency offset calculation unit: this unit major function is the time error that calculates real time and the theoretical time of the operation of FemtoCell self clock
The time adjustment unit: this unit mainly is the bias voltage that is converted into VCXO by the carrier frequency offset that will obtain, adjust bias voltage by processor, finally make the clock frequency of crystal oscillator output consistent with the macro base station of information source, reach the purpose of eliminating frequency deviation.
More than be preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention when the function that produces does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (6)
1. method that is used for the FemtoCell air interface synchronization of TD-SCDMA standard is characterized in that: may further comprise the steps:
(1) after FemtoCell powered on for the first time, the Femto gateway by access obtained quantity, frequency, the codeword information of peripheral macro base station, generates corresponding macro base station Neighboring Cell List;
(2) adjacent macro base station in the macro base station Neighboring Cell List is sorted, select the best macro base station of signal quality wherein as the synchronous information source base station of initial synchronisation access;
(3) adopt the two-stage method of synchronization to carry out the initial synchronisation access, it is synchronously thick that the first order adopts the Window coupling to carry out, and it is synchronously thin that the second level adopts the matched filter coherent detection to carry out, to finish fast the initial synchronisation access;
(4) after FemtoCell finishes the initial synchronisation access, monitoring receives the signal quality of each macro base station, select the wherein best macro base station conduct of signal quality to keep synchronous synchronous information source base station, perhaps select a plurality of base stations as synchronous information source base station, and will with the average result of each synchronous information source base station synchronization as reference synchronization; Periodically detect synchronous information source base station, calculate the frequency error of self, by the time adjustment unit, the correction of frequency error to keep synchronously, is monitored whether step-out of synchronous information source base station simultaneously.
2. the method for the FemtoCell air interface synchronization for the TD-SCDMA standard according to claim 1, it is characterized in that: in step (1), the FemtoCell network is divided into a plurality of Route Area RA, the range of management of the corresponding macro base station of each RA scope, allow overlapping between the RA, so that a Femto gateway belongs to a plurality of RA, FemtoCell accesses its corresponding Femto gateway by the fixed network resource, know its residing RA lane place, after powering on, passes through FemtoCell the authentication access network, near the concrete quantity of macro base station obtaining, frequency and code word generate corresponding macro base station Neighboring Cell List.
3. the method for the FemtoCell air interface synchronization for the TD-SCDMA standard according to claim 1, it is characterized in that: in step (2), the Femto gateway is measured the time delay that arrives each macro base station in the macro base station Neighboring Cell List from Femto through core net, pass through calculation delay, upgrade the macro base station Neighboring Cell List of Femto gateway, make the macro base station of time delay minimum come first of macro base station Neighboring Cell List, with the synchronous information source base station as the initial synchronisation access.
4. the method for the FemtoCell air interface synchronization for the TD-SCDMA standard according to claim 1, it is characterized in that: FemtoCell detects the synchronous situation of relevant macro base station in the normal synchronized maintenance process, when finding that certain macro base station step-out then changes synchronous information source base station automatically, and report and alarm information is to the Femto gateway.
5. the method for the FemtoCell air interface synchronization for the TD-SCDMA standard according to claim 1, it is characterized in that: FemtoCell comprises sync search unit, after working on power as FemtoCell, by related operation, realize fast the clock synchronous with peripheral information source macro base station.
6. the method for the FemtoCell air interface synchronization for the TD-SCDMA standard according to claim 1, it is characterized in that: FemtoCell also further comprises:
Updating block is used for after FemtoCell finishes the initial synchronisation access synchronously, by the synchronous update time of presetting, is updated periodically the synchronous of FemtoCell;
The frequency offset calculation unit is for detection of the frequency error of FemtoCell in cycle time self clock circuit;
The time adjustment unit after knowing corresponding frequency error, is corrected the frequency error of FemtoCell self clock by the clock Circuit tuning.
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| CN102740446B (en) * | 2011-04-12 | 2017-06-06 | 上海无线通信研究中心 | The air interface synchronization method of multipoint cooperative in a kind of TDD distributed networks |
| WO2012171339A1 (en) * | 2011-06-17 | 2012-12-20 | 上海无线通信研究中心 | Method for obtaining and keeping synchronization between home nodebs |
| CN103139809B (en) * | 2011-12-02 | 2015-09-16 | 中兴通讯股份有限公司 | A kind of clock synchronizing method and device |
| CN103813436A (en) * | 2012-11-05 | 2014-05-21 | 京信通信系统（中国）有限公司 | Method for synchronizing household base station air interface, apparatus, and household base station |
| CN103298101B (en) * | 2013-06-19 | 2016-02-17 | 中国人民解放军空军工程大学 | A kind of code subcarrier synchronization realizing method of wide region |
| CN104754723A (en) * | 2013-12-26 | 2015-07-01 | 中兴通讯股份有限公司 | Processing method and device for air interface synchronization signaling |
| CN104053172B (en) * | 2014-06-24 | 2017-09-26 | 京信通信系统（中国）有限公司 | Home gateway lock-out processing method and system |
| CN105472725A (en) * | 2016-02-06 | 2016-04-06 | 北京佰才邦技术有限公司 | Base station synchronization method and device |
| CN105657816B (en) * | 2016-03-30 | 2019-03-19 | 京信通信系统（中国）有限公司 | Maintain the method and apparatus of synchronization among base stations |
| CN110798854B (en) * | 2018-08-03 | 2021-10-26 | 上海华为技术有限公司 | Clock state detection method and device |
| CN110113240A (en) * | 2019-04-24 | 2019-08-09 | 西安电子科技大学 | Bus paradigmatic system based on 100 m ethernet mouth |
| CN111954296B (en) * | 2020-08-11 | 2021-10-01 | 北京邮电大学 | Time synchronization method and device for self-organizing network |
| WO2023245527A1 (en) * | 2022-06-23 | 2023-12-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio resource allocation in a communication network |
| CN115453778B (en) * | 2022-08-04 | 2024-02-27 | 中国电子科技集团公司第十四研究所 | Low-spurious electro-optic modulator bias point control device and method |
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