CN102111868A - Null interface synchronization method and base station - Google Patents
Null interface synchronization method and base station Download PDFInfo
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- CN102111868A CN102111868A CN2009102432225A CN200910243222A CN102111868A CN 102111868 A CN102111868 A CN 102111868A CN 2009102432225 A CN2009102432225 A CN 2009102432225A CN 200910243222 A CN200910243222 A CN 200910243222A CN 102111868 A CN102111868 A CN 102111868A
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Abstract
The embodiment of the invention relates to the wireless communication technology, in particular to a null interface synchronization method and a base station, which are used for solving the problem that the stability of the base station is influenced due to the interference of a global positioning system (GPS) in GPS-based null interface synchronization mode in the prior art. The method provided by the embodiment of the invention comprises the following steps that: the base station detects a downlink pilot time slot (DwPTS) of a reference base station corresponding to the base station by, and determines a downlink synchronous code (SYNC-DL) from a signal of the detected DwPTS; the base station determines a basic midamble code corresponding to the reference base station, and performs channel estimation by using the basic midamble code according to the SYNC_DL to acquire time information; and null interface synchronization is performed according to a system frame number (SFN) determined by reading the broadcast information of the reference base station and the acquired time information. The base station in a global network can perform the null interface synchronization without the GPS or with the unstable GPS by adopting the method provided by the embodiment of the invention, so that the stability of the normal operation of the base station in the global network is guaranteed.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of method of air interface synchronization and base station.
Background technology
TD-SCDMA (Time Division Synchronized Code Division Multiple Access, TDS-CDMA system) system is a synchro system, and strict air interface synchronization requirement is arranged between the base station.3GPP (3rd Generation Partnership Project, 3G (Third Generation) Moblie standardization body) regulation, the idle port synchronization error of eating dishes without rice or wine between the base station is less than 3us.
The method of synchronization of TD-SCMDA system is to carry out synchronously based on GPS (Global Positioning Systems, global positioning system) at present.Be that each base station all disposes the GPS receiver, (Pulse Per Second PPS) carries out air interface synchronization in real time, keeps the base station synchronous in the absolute moment of the 5ms subframe of eating dishes without rice or wine to utilize the accurate pulse per second (PPS) that the GPS receiver provides.
In the method for synchronization based on the TD-SCDMA system of GPS, gps system is subjected to the interference of external environments such as weather easily, thereby the stability of base station is brought influence.
In sum, in the air interface synchronization mode based on GPS,, can bring influence at present to the stability of base station if gps system is interfered.
Summary of the invention
The embodiment of the invention provides a kind of method and base station of air interface synchronization, in order to solve in the air interface synchronization mode based on GPS that exists in the prior art, if gps system is interfered, can bring the problem of influence to the stability of base station.
The method of a kind of air interface synchronization that the embodiment of the invention provides, this method comprises:
The descending pilot frequency time slot DwPTS of base station detection self corresponding reference base station determines descending synchronous code SYNC_DL from the DwPTS signal that detects;
The basic training sequences basic midamble sign indicating number of described reference base station correspondence is determined according to described SYNC_DL in described base station, and utilizes described basic midamble sign indicating number to carry out channel estimating, obtains temporal information;
Described base station is according to the broadcast message that reads described reference base station and definite system frame number SFN, and described temporal information is carried out air interface synchronization.
A kind of base station that the embodiment of the invention provides, this base station comprises:
Detection module is used to detect the descending pilot frequency time slot DwPTS of self corresponding reference base station, determines descending synchronous code SYNC_DL from the DwPTS signal that detects;
Channel estimation module is used for according to described SYNC_DL, determines the basic training sequences basic midamble sign indicating number of described reference base station correspondence, and utilizes described basic midamble sign indicating number to carry out channel estimating, obtains temporal information;
Synchronization module be used for definite system frame number SFN according to reading the broadcast message of described reference base station, and described temporal information is carried out air interface synchronization.
The DwPTS (descending pilot frequency time slot) of embodiment of the invention base station detection self corresponding reference base station, from the DwPTS signal that detects, determine SYNC_DL (descending synchronous code), according to SYNC_DL, determine basic midamble (basic training sequences) sign indicating number of reference base station correspondence, and utilize basic midamble sign indicating number to carry out channel estimating, and obtain temporal information according to channel estimation results, according to SFN (SystemFrame Number, System Frame Number) and temporal information carry out air interface synchronization, wherein SFN is that the broadcast message that reference base station is read in the base station obtains.
Because the embodiment of the invention is not carried out air interface synchronization based on GPS, makes all basic station over network carry out air interface synchronization under no GPS or the unsettled situation of GPS, guarantee the stability of all basic station over network operate as normal;
Further, every stylobate station can not need independent installation GPS receiver and antenna, thereby has reduced the cost and the construction complexity of base station.
Description of drawings
Fig. 1 is the structural representation of embodiment of the invention base station;
Fig. 2 is the method flow schematic diagram of embodiment of the invention air interface synchronization;
Fig. 3 is the classification schematic diagram between the embodiment of the invention base station.
Embodiment
The DwPTS of embodiment of the invention base station detection self corresponding reference base station, from the DwPTS signal that detects, determine SYNC_DL, according to SYNC_DL, determine the basic midamble sign indicating number of reference base station correspondence, and utilize basic midamble sign indicating number to carry out channel estimating to obtain temporal information, carry out air interface synchronization according to SFN and temporal information, wherein SFN is the broadcast message acquisition that reference base station is read in the base station.Because the embodiment of the invention is not carried out air interface synchronization based on GPS, makes all basic station over network carry out air interface synchronization under no GPS or the unsettled situation of GPS, guarantee the stability of all basic station over network operate as normal.
The embodiment of the invention can be applied in the TD-SCDMA system, and also can be applied in other need carry out in the system of air interface synchronization.
Before carrying out air interface synchronization, need be to setting one or several seed base stations in the whole network or the localized network, GPS receiver or Big Dipper receiver can be adopted or based on IEEE (Institute ofElectrical and Electronics Engineers in the seed base station, IEEE-USA) 1588 agreements obtain synchronised clock from transmission network, and the seed base station can guarantee to obtain the clock of high accuracy, high stable.The progression of considering the whole network air interface synchronization base station can not be too much, and the seed base station can evenly distribute at the whole network, is positioned at the center of place regional area as far as possible.
The seed base station can be used as the base station of highest ranking, determines the next stage base station of seed base station then, if a plurality of grades are arranged, can also continue to determine next stage base station again, specifically divides what grades and can set as required.
The next stage base station can be with at least one base station of upper level as the reference base station, and which base station of concrete upper level can be set as required as the reference base station, but needs to guarantee that the next stage base station can receive the signal of reference base station.
After dividing the base station end, can be by webmaster OMC (operation maintenance center) with the sub-district ID (sign) of the main carrier frequency of corresponding reference base station, base station, reference base station, notify this base station with the distance information such as (also can be propagation delay time) of reference base station, be used for the base station and carry out the air interface synchronization process and use.
Can receive a plurality of seeds base station and/or upper level signal of base station if can guarantee the base station during planning of site, then need the information configuration of a plurality of seeds base station and/or upper level base station is got off, the base station can receive a plurality of reference signals like this, during Synchronous Processing comprehensive and optimization process are carried out in a plurality of references, to obtain optimal results.
Below in conjunction with Figure of description the embodiment of the invention is described in further detail.
As shown in Figure 1, embodiment of the invention base station comprises: detection module 10, channel estimation module 20 and synchronization module 30.
Wherein, detection module 10 can be known self corresponding reference base station according to pre-configured Base Station Identification.
Temporal information can be (being time point) sometime, also can be the information of representing sometime.
The broadcast message that can read reference base station such as synchronization module 30 obtains corresponding SFN.
Need to prove that the embodiment of the invention is not limited to by reading to broadcast the mode that obtains SFN, other modes that can obtain SFN are suitable for the embodiment of the invention equally.
Wherein, detection module 10 can adopt characteristics window, detects the position of the DwPTS of reference base station.
Be example with the TD-SCDMA system, concrete: in the TD-SCDMA frame structure, there is 32chip GP (protection at interval) on the SYNC_DL left side, and there is 96chip GP on the right.Because GP power is very low, the 64chip position power at SYNC_DL place with both sides altogether 64chip position power compare can be very big, feature window length is got 128chip, moves in the 6400chip of subframe scope, can obtain the approximate location of SYNC_DL.
Be example with the TD-SCDMA system, concrete: in order to prevent the signal of the non-reference base station of flase drop, the base station is according to the SYNC_DL sequence of the fixing detection reference base station correspondence of the frequency point information of predefined reference base station.According to the SYNC_DL position of determining the SYNC_DL sequence is carried out matched filtering, can obtain the synchronization accuracy of chip level based on the peak of related power.If a plurality of peak is then got the result of first position as reference synchronization, remaining peak can be worked as multipath in the matched filtering.
Wherein, channel estimation module 20 can be determined the basic midamble sign indicating number of reference base station correspondence according to the cell ID and the SYNC_DL of predefined reference base station.
Be example with the TD-SCDMA system, concrete: the synchronization accuracy that utilizes the channel impulse response acquisition 1/8chip of TS0.Based on sub-district ID with detected the SYNC_DL sign indicating number, can determine the basic midamble sign indicating number of reference base station.Midamble to TS0 carries out channel estimating, by can obtain the synchronization accuracy of 1/8chip to 8 times of interpolation of channel impulse response.
Because wireless signal can introduce time delay at spatial transmission, when adjusting synchronously based on the signal of eating dishes without rice or wine, the next stage base station need know that distance with reference base station is with the compensation space propagation delay time.Preferable, the base station of the embodiment of the invention can further include: compensating module 40.
Compensating module 40 is used for the distance according to predefined self and reference base station, determines propagation delay time, and according to the propagation delay time of determining, the temporal information that channel estimation module 20 is obtained compensates.
Accordingly, the temporal information of synchronization module 40 after according to 40 compensation of SFN and compensating module carried out air interface synchronization.
If the corresponding a plurality of reference base station in the base station of the embodiment of the invention, then detection module 10 needs to determine respectively the SYNC_DL of each reference base station; The basic midamble sign indicating number that channel estimation module 20 needs to determine each reference base station respectively carries out channel estimating; Synchronization module 30 need obtain the SFN of each reference base station respectively.
Accordingly, synchronization module 30 carries out air interface synchronization according to SFN and temporal information when self corresponding a plurality of reference base station.
If the SFN of each reference base station correspondence that synchronization module 30 is determined is inequality, synchronization module 30 can be to not carrying out this simultaneous operation; Also can be, and carry out simultaneous operation with identical and SFN that quantity is maximum as carrying out the used SFN of air interface synchronization, such as 5 reference base station altogether, it is A that 3 SFN are arranged, 2 SFN are B, then can select A to carry out simultaneous operation.
If it all is SFN identical and that quantity is maximum that two SFN are arranged, then can select a SFN as carrying out the used SFN of air interface synchronization, such as having 5 reference base station altogether, it is A that 2 SFN are arranged, 2 SFN are B, and a SFN is C, then can select A or B to carry out simultaneous operation.
If the corresponding a plurality of reference base station in base station, each reference base station time information corresponding that synchronization module 30 can also obtain according to channel estimation module 20 is (if there is compensating module 40, then according to each the reference base station time information corresponding after compensating module 40 compensation), determine to optimize temporal information, and will optimize temporal information as carrying out the used temporal information of air interface synchronization.
Wherein, it is a variety of that synchronization module 30 determines that according to each reference base station time information corresponding the mode of optimization temporal information has, and enumerates several below.
Mode one, synchronization module 30 are got the average moment in the moment that each reference base station time information corresponding represents, will average time information corresponding constantly as optimizing temporal information.
Preferable, after the maximum in the moment that synchronization module 30 can be represented all reference base station time information corresponding and minimum value are rejected, get the average moment in the moment that residue reference base station time information corresponding represents, will average time information corresponding constantly as optimizing temporal information.
The moment that the moment that mode two, the temporal information of using when synchronization module 30 will upgrade last time are represented and each reference base station time information corresponding are represented takes absolute value after doing difference respectively, selection is not more than the absolute value of setting threshold, determines the absolute value corresponding reference base station time information corresponding of selecting;
Wherein, the size of threshold value can be set as required, such as 0.5us, 1us etc.Threshold setting more little, the optimization temporal information that obtains is accurate more.
The moment that the temporal information of using when upgrading last time such as the base station is represented is T, the moment that 3 reference base station time information corresponding are represented is respectively T1, T2 and T3, take absolute value and obtain Δ T1, Δ T2 and Δ T3 after T done difference with T1, T2 and T3 respectively, then Δ T1, Δ T2 and Δ T3 and setting threshold are compared.
Suppose that Δ T2 and Δ T3 are not more than threshold value, then the base station can be selected one from Δ T2 and Δ T3, such as selecting Δ T2, and with the temporal information of the T2 of Δ T2 correspondence as optimizing temporal information; The base station can also be determined the average moment of T2 and T3 according to the scheme of mode one, and on average moment time information corresponding is as optimizing temporal information.
Need to prove that the embodiment of the invention is not limited to above-mentioned dual mode, other can determine that the mode of optimizing temporal information is suitable for the embodiment of the invention equally according to each reference base station time information corresponding.
In specific implementation process, can further include of the embodiment of the invention: trigger module 50.
Wherein, satisfy the condition carry out air interface synchronization and comprise a kind of in the following condition:
When carrying out air interface synchronization, equal one-period (length in cycle can be set as required, such as 1 hour, 12 hours, 24 hours etc.) apart from the duration that carried out air interface synchronization last time in the cycle;
The base station initialization starts;
GPS receiver fault in the base station;
Gps system is interfered.
Need to prove that the embodiment of the invention satisfies the condition carry out air interface synchronization and is not limited to above-mentioned condition, other conditions that can determine to carry out air interface synchronization all are to use the embodiment of the invention.
As shown in Figure 2, the method for embodiment of the invention air interface synchronization comprises the following steps:
The DwPTS of step 201, base station detection self corresponding reference base station determines SYNC_DL from the DwPTS signal that detects.
Wherein, self corresponding reference base station can be known according to pre-configured Base Station Identification in the base station.
The basic midamble sign indicating number of reference base station correspondence is determined according to SYNC_DL in step 202, base station, and utilizes basic midamble sign indicating number to carry out channel estimating, obtains temporal information.
Temporal information can be sometime, also can be the information of representing sometime.
The broadcast message that can read reference base station such as the base station obtains corresponding SFN.
Need to prove that the embodiment of the invention is not limited to by reading to broadcast the mode that obtains SFN, other modes that can obtain SFN are suitable for the embodiment of the invention equally.
In the step 201, characteristics window can be adopted in the base station, detects the position of the DwPTS of reference base station.
Be example with the TD-SCDMA system, concrete: in the TD-SCDMA frame structure, there is 32chip GP (protection at interval) on the SYNC_DL left side, and there is 96chip GP on the right.Because GP power is very low, the 64chip position power at SYNC_DL place with both sides altogether 64chip position power compare can be very big, feature window length is got 128chip, moves in the 6400chip of subframe scope, can obtain the approximate location of SYNC_DL.
In the step 201, the matched filtering mode can be adopted in the base station, according to the frequency point information of predefined reference base station, from the DwPTS of detected reference base station, determines SYNC_DL.
Be example with the TD-SCDMA system, concrete: in order to prevent the signal of the non-reference base station of flase drop, the base station is according to the SYNC_DL sequence of the fixing detection reference base station correspondence of the frequency point information of predefined reference base station.According to the SYNC_DL position of determining the SYNC_DL sequence is carried out matched filtering, can obtain the synchronization accuracy of chip level based on the peak of related power.If a plurality of peak is then got the result of first position as reference synchronization, remaining peak can be worked as multipath in the matched filtering.
In the step 202, the basic midamble sign indicating number of reference base station correspondence can be determined according to the cell ID and the SYNC_DL of predefined reference base station in the base station.
Be example with the TD-SCDMA system, concrete: the synchronization accuracy that utilizes the channel impulse response acquisition 1/8chip of TS0.Based on sub-district ID with detected the SYNC_DL sign indicating number, can determine the basic midamble sign indicating number of reference base station.Midamble to TS0 carries out channel estimating, by can obtain the synchronization accuracy of 1/8chip to 8 times of interpolation of channel impulse response.
Because wireless signal can introduce time delay at spatial transmission, when adjusting synchronously based on the signal of eating dishes without rice or wine, the next stage base station need know that distance with reference base station is with the compensation space propagation delay time.Preferable, can further include between step 202 and the step 203:
Step a202, base station determine propagation delay time according to the distance of predefined self and reference base station.
Step b202, base station compensate the temporal information that obtains according to the propagation delay time of determining.
Such as propagation delay time is 1ms, then need shift to an earlier date 1ms on the basis of temporal information.
Accordingly, in the step 203 base station according to SFN and the compensation after temporal information carry out air interface synchronization.
If the corresponding a plurality of reference base station in the base station of the embodiment of the invention, then in the step 201, the base station needs to determine respectively the SYNC_DL of each reference base station; In the step 202, the basic midamble sign indicating number that the base station needs to determine each reference base station respectively carries out channel estimating; In the step 203, the base station need obtain the SFN of each reference base station respectively.
Accordingly, in the step 203, the base station is in self corresponding a plurality of reference base station, and the SFN of each reference base station correspondence of determining carries out air interface synchronization according to SFN and temporal information when identical.
If the SFN of each reference base station correspondence of determining is inequality, the base station can be to not carrying out this simultaneous operation; Also can be, and carry out simultaneous operation with identical and SFN that quantity is maximum as carrying out the used SFN of air interface synchronization, such as 5 reference base station altogether, it is A that 3 SFN are arranged, 2 SFN are B, then can select A to carry out simultaneous operation.
If it all is SFN identical and that quantity is maximum that two SFN are arranged, then can select a SFN as carrying out the used SFN of air interface synchronization, such as having 5 reference base station altogether, it is A that 2 SFN are arranged, 2 SFN are B, and a SFN is C, then can select A or B to carry out simultaneous operation.
If the corresponding a plurality of reference base station in base station can further include between step 202 and the step 203:
Each reference base station time information corresponding that the base station basis obtains is (if there is compensation, then according to each the reference base station time information corresponding after the compensation), determine to optimize temporal information, and will optimize temporal information as carrying out the used temporal information of air interface synchronization.
Wherein, it is a variety of that the base station determines that according to each reference base station time information corresponding the mode of optimization temporal information has, and enumerates several below.
The average moment in the moment that each reference base station time information corresponding represents is got in mode one, base station, will average time information corresponding constantly as optimizing temporal information.
Preferable, after the maximum in the moment that the base station can be represented all reference base station time information corresponding and minimum value are rejected, get the average moment in the moment that residue reference base station time information corresponding represents, will average time information corresponding constantly as optimizing temporal information.
The moment that the moment that mode two, the temporal information of using when the base station will be upgraded last time are represented and each reference base station time information corresponding are represented takes absolute value after doing difference respectively, selection is not more than the absolute value of setting threshold, determines the absolute value corresponding reference base station time information corresponding of selecting;
A temporal information can be selected in the base station from the absolute value corresponding reference base station time information corresponding of determining then, and with the temporal information selected as optimizing temporal information; Perhaps the scheme according to mode one obtains the average moment from the absolute value corresponding reference base station time information corresponding of determining, on average moment time information corresponding is as optimizing temporal information.
Wherein, the size of threshold value can be set as required, such as 0.5us, 1us etc.Threshold setting more little, the optimization temporal information that obtains is accurate more.
The moment that the temporal information of using when upgrading last time such as the base station is represented is T, the moment that 3 reference base station time information corresponding are represented is respectively T1, T2 and T3, take absolute value and obtain Δ T1, Δ T2 and Δ T3 after T done difference with T1, T2 and T3 respectively, then Δ T1, Δ T2 and Δ T3 and setting threshold are compared.
Suppose that Δ T2 and Δ T3 are not more than threshold value, then the base station can be selected one from Δ T2 and Δ T3, such as selecting Δ T2, and with the temporal information of the T2 of Δ T2 correspondence as optimizing temporal information; The base station can also be determined the average moment of T2 and T3 according to the scheme of mode one, and on average moment time information corresponding is as optimizing temporal information.
Need to prove that the embodiment of the invention is not limited to above-mentioned dual mode, other can determine that the mode of optimizing temporal information is suitable for the embodiment of the invention equally according to each reference base station time information corresponding.
In the step 201, the base station determine to satisfy carry out the condition of air interface synchronization after, detect the DwPTS of self corresponding reference base station.
Wherein, satisfy the condition carry out air interface synchronization and comprise a kind of in the following condition:
When carrying out air interface synchronization, equal one-period (length in cycle can be set as required, such as 1 hour, 12 hours, 24 hours etc.) apart from the duration that carried out air interface synchronization last time in the cycle;
The base station initialization starts;
GPS receiver fault in the base station;
Gps system is interfered.
Need to prove that the embodiment of the invention satisfies the condition carry out air interface synchronization and is not limited to above-mentioned condition, other conditions that can determine to carry out air interface synchronization all are to use the embodiment of the invention.
As shown in Figure 3, in the classification schematic diagram between the embodiment of the invention base station, have the polarity base station altogether, first order base station is A and B, be that A and B are the seed base stations, base station, the second level is A1, A2, A3, B1, B2 and A3, wherein, A1, A2 and A3 corresponding reference base station are A, and B1 and B2 corresponding reference base station are B.
In when configuration, need with the sub-district ID of the main carrier frequency of A base station, A base station, with information such as distance notice A1, the A2 and the A3 of A base station; With the sub-district ID of the main carrier frequency of B base station, B base station, with information such as distance notice B1, the B2 and the A3 of B base station.
When needs carried out air interface synchronization, the base station of next grade can adopt the mode of top embodiment description and the base station of a last grade to carry out air interface synchronization.
The execution mode of the base station of the base station of more grades and two grades is similar, does not repeat them here.
Wherein, in the processing scheme during the base station initial start of the embodiment of the invention:
After the starting of base station, the radio-frequency channel switch is set to accepting state, and transmission is closed;
Above-described air interface synchronization processing procedure is realized in the base station: after accurately searching the DwPTS and TS0 signal of reference base station, after the constant transmissions time delay compensated, promptly obtained the position of 5ms frame head, synchronization accuracy is the highest can to reach 1/8chip;
The position of the 5ms frame head that the base station obtains search offers the inside of base station high stability crystal oscillator and does the clock synchronization reference as PP1S (pulse per second (PPS)) synchronizing signal that similar GPS receiver provides, and the operation principle of the phase-locked loop isochronon synchronization module of back remains unchanged;
O﹠amp; M (Operations ﹠amp; Maintenance, operation and maintenance) equipment initiation SFN calibration flow process, guarantee that the inside of base station integrated circuit board obtains synchronous System Frame Number, the synchronizing sub-frame precision of eating dishes without rice or wine is with consistent based on the GPS scheme.
Wherein, in the processing scheme during the base station operate as normal of the embodiment of the invention:
The high stability crystal oscillator of base station has certain frequency stability, along with the time has precision drift.Therefore need calibrate it termly based on synchronous reference signal during the operate as normal of base station, calibration cycle is configurable under the prerequisite that guarantees precision.
If BTS hardware adopts independent reception antenna and independent radio frequency reception channel to receive the air interface synchronization signal, then can be in real time the air interface synchronization signal of seed base station be detected, high stability crystal oscillator carries out real-time reference and adjustment;
If BTS hardware is beneficial to existing work antenna and the radio-frequency channel receives synchronizing clock signals, but economize on hardware cost, but need be in continuous some subframes of air interface synchronization signal detection cycle arrival, the switching instant of the transmit-receive switch of radio-frequency channel needs special processing, promptly when carrying out air interface synchronization, need when beginning, the TS0 time slot radio-frequency (RF) switch be set to accepting state, with the data of reception TS0 and DwPTS time slot, rather than the transmit status under the normal mode of operation.
In specific implementation process, the scheme of the embodiment of the invention both can be used as without any the main synchronization scenario of using in the base station of synchronisation source; Can also be as having an alternative scheme of the base station of GPS synchronous condition, the base station starts the air interface synchronization scheme automatically under the conditions such as promptly unavailable at gps signal, GPS receiver damage, can continue operate as normal to guarantee the base station.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software implementation example or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form that goes up the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of carrying out on computer or other programmable devices is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic creative notion of cicada, then can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.
From the foregoing description as can be seen: the DwPTS that self corresponding reference base station is detected in embodiment of the invention base station, from the DwPTS signal that detects, determine SYNC_DL; The basic midamble sign indicating number of reference base station correspondence is determined according to SYNC_DL in the base station, and utilizes basic midamble sign indicating number to carry out channel estimating, obtains temporal information; According to the broadcast message that reads reference base station and definite SFN, and the temporal information that obtains is carried out air interface synchronization.
Because the embodiment of the invention is not carried out air interface synchronization based on GPS, makes all basic station over network carry out air interface synchronization under no GPS or the unsettled situation of GPS, guarantee the stability of all basic station over network operate as normal;
Further, every stylobate station can not need independent installation GPS receiver and antenna, thereby has reduced the cost and the construction complexity of base station.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. the method for an air interface synchronization is characterized in that, this method comprises:
The descending pilot frequency time slot DwPTS of base station detection self corresponding reference base station determines descending synchronous code SYNC_DL from the DwPTS signal that detects;
The basic training sequences basic midamble sign indicating number of described reference base station correspondence is determined according to described SYNC_DL in described base station, and utilizes described basic midamble sign indicating number to carry out channel estimating, obtains temporal information;
Described base station is according to the broadcast message that reads described reference base station and definite system frame number SFN, and described temporal information is carried out air interface synchronization.
2. the method for claim 1 is characterized in that, described base station determines that the SYNC_DL sign indicating number comprises:
Characteristics window is adopted in described base station, detects the position of the DwPTS of reference base station;
The matched filtering mode is adopted in described base station, according to the frequency point information of predefined reference base station, from the DwPTS of detected reference base station, determines SYNC_DL.
3. the method for claim 1 is characterized in that, described base station determines that the basic midamble sign indicating number of reference base station correspondence comprises:
The basic midamble sign indicating number of reference base station correspondence is determined according to the cell ID of described SYNC_DL and predefined described reference base station in described base station.
4. the method for claim 1 is characterized in that, described base station obtains after the temporal information, carries out also comprising before the air interface synchronization:
Propagation delay time is determined according to the distance of predefined self and described reference base station in described base station;
Described base station compensates the temporal information that obtains according to the propagation delay time of determining;
Described base station is carried out air interface synchronization and is comprised:
Described base station according to SFN and the compensation after temporal information, carry out air interface synchronization.
5. the method for claim 1 is characterized in that, the corresponding a plurality of reference base station in described base station;
Described base station carries out also comprising before the air interface synchronization according to described SFN:
Described base station determines that the SFN of each described reference base station correspondence is identical.
6. method as claimed in claim 5 is characterized in that, described base station carries out also comprising before the air interface synchronization according to described SFN:
When there is different SFN described base station in the SFN of each described reference base station correspondence of determining, with identical and SFN that quantity is maximum as carrying out the used SFN of air interface synchronization.
7. as claim 5 or 6 described methods, it is characterized in that described base station obtains after the temporal information, carry out also comprising before the air interface synchronization:
Described base station is determined to optimize temporal information according to each the described reference base station time information corresponding that obtains, and with described optimization temporal information as carrying out the used temporal information of air interface synchronization.
8. as the described method of the arbitrary claim of claim 1～6, it is characterized in that, also comprise before the DwPTS of detection self corresponding reference base station, described base station:
The condition of carrying out air interface synchronization is determined to satisfy in described base station;
Describedly satisfy the condition carry out air interface synchronization and comprise a kind of in the following condition:
When carrying out air interface synchronization in the cycle, the duration that carried out air interface synchronization apart from last time equals one-period;
The base station initialization starts;
GPS receiver fault in the base station;
Gps system is interfered.
9. a base station is characterized in that, this base station comprises:
Detection module is used to detect the descending pilot frequency time slot DwPTS of self corresponding reference base station, determines descending synchronous code SYNC_DL from the DwPTS signal that detects;
Channel estimation module is used for according to described SYNC_DL, determines the basic training sequences basic midamble sign indicating number of described reference base station correspondence, and utilizes described basic midamble sign indicating number to carry out channel estimating, obtains temporal information;
Synchronization module be used for definite system frame number SFN according to reading the broadcast message of described reference base station, and described temporal information is carried out air interface synchronization.
10. base station as claimed in claim 9 is characterized in that, described detection module specifically is used for:
Adopt characteristics window, detect the position of the DwPTS of reference base station, adopt the matched filtering mode,, from the DwPTS of detected reference base station, determine SYNC_DL according to the frequency point information of predefined reference base station.
11. base station as claimed in claim 9 is characterized in that, described channel estimation module specifically is used for:
According to the cell ID of described SYNC_DL and predefined described reference base station, determine the basic midamble sign indicating number of reference base station correspondence.
12. base station as claimed in claim 9 is characterized in that, described base station also comprises:
Compensating module is used for the distance according to predefined self and described reference base station, determines propagation delay time, and the propagation delay time according to determining compensates the temporal information that obtains;
Described synchronization module specifically is used for:
According to the temporal information after SFN and the compensation, carry out air interface synchronization.
13. base station as claimed in claim 9 is characterized in that, described synchronization module specifically is used for:
In self corresponding a plurality of reference base station, and the SFN of each described reference base station correspondence of determining carries out air interface synchronization according to described SFN when identical.
14. base station as claimed in claim 13 is characterized in that, described synchronization module also is used for:
When in the SFN of each described reference base station correspondence of determining, different SFN being arranged, with identical and SFN that quantity is maximum as carrying out the used SFN of air interface synchronization.
15., it is characterized in that described synchronization module also is used for as claim 13 or 14 described base stations:
According to each the described reference base station time information corresponding that obtains, determine to optimize temporal information, and with described optimization temporal information as carrying out the used temporal information of air interface synchronization.
16., it is characterized in that described base station also comprises as the described base station of the arbitrary claim of claim 9～14:
Trigger module, be used for determine to satisfy carry out the condition of air interface synchronization after, trigger the DwPTS that described detection module detects self corresponding reference base station;
Describedly satisfy the condition carry out air interface synchronization and comprise a kind of in the following condition:
When carrying out air interface synchronization in the cycle, the duration that carried out air interface synchronization apart from last time equals one-period;
The base station initialization starts;
GPS receiver fault in the base station;
Gps system is interfered.
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