CN105682214A - Baseband and radio frequency combined time sequence adjustment method and device - Google Patents

Abstract

The invention discloses a baseband and radio frequency combined time sequence adjustment method and device. Each adjustment cycle comprises following steps of detecting the receiving time sequence and transmitting time sequence of data, thus obtaining the receiving time sequence offset and transmitting time sequence offset of a baseband unit BBU, and the receiving time sequence offset and transmitting time sequence offset of a radio remote unit RRU; generating a common public radio interface CPRI frame header, thus obtaining the offset of an air interface frame header; obtaining the data receiving adjustment amount and data transmitting adjustment amount corresponding to baseband processing according to the receiving time sequence offset and the transmitting time sequence offset of the baseband unit BBU and the offset of the air interface frame header; adjusting the baseband processed receiving frame header and the transmitting frame header; adjusting the baseband processed data streams; and outputting the CPRI frame header, the receiving time sequence offset and the transmitting time sequence offset of the RRU, the data receiving adjustment amount, the data transmitting adjustment amount and the adjusted data streams. According to the method and the device provided by the invention, the time sequence drifts resulted from the movement of a terminal and the frequency offset of a crystal oscillator can be maintained in real time.

Description

Timing adjusting method that a kind of base band is combined with radio frequency and device

Technical field

The present invention relates to wireless communication field, particularly relate to timing adjusting method and device that a kind of base band is combined with radio frequency.

Background technology

In wireless system, base station equipment generally adopts BBU (BasebandUnit, baseband processing unit) and the design of RRU (RadioRemoteUnit, Remote Radio Unit) separate type.

Earth-space communication terminal in correlation technique, as CPE (CustomerPremiseEquipment, ustomer premises access equipment), Relay (RelayNode, relaying), test terminal equipment etc. require special terminal side equipment; Terminal side equipment such as earth-space communication; Realize retransmission function and CPE and the Relay of edges cover; And it is specifically designed to the terminal unit of drive test and test.

This type of terminal side equipment needs to support the functions such as high-power transmitting, telecommunication, special test function, special performance indications, and therefore, this kind equipment generally also adopts BBU and the RRU separation design of base station.

Terminal side equipment need to ensure that reception separates with launching frame head, with the air interface synchronization of base station side. And due to terminal unit high-speed mobile, without factors such as the GPS crystal oscillator caused and base station asynchronous, receive and transmitting frame head exists large range of real-time drift.

For above-mentioned situation, the base station equipment of BBU and RRU separate type, it is necessary to carry out clock alignment and sequential adjustment of eating dishes without rice or wine according to GPS (GlobalPositioningSystem, global positioning system); Terminal side equipment needs BBU to carry out the adjustment of data and sequential in real time; TDD (TimeDivisionDuplexing, time division duplex) system RRU needs the switching being received according to sequential and launching; RRU needs to carry out power statistic, standing-wave ratio detection etc. according to sequential.

As it is shown in figure 1, common BBU and RRU sequential adjusts handling process includes 3 parts, it is frame head adjustment, reception process and emission process respectively.

Frame head adjusts handling process and includes:

Step S101:GPS signal search, carries out clock phase discrimination according to GPS PP1S (Pulseper1second, a pulse per second) signal recovered after locking GPS, can obtain accurate 10MHz clock after clock phase discrimination;

Step S102:BBU produces 10ms signal according to the 10MHz clock after calibration, and produces the 10ms signal eated dishes without rice or wine according to the PP1S signal of GPS. According to base band and radio frequency processing time delay, produce 10ms signal and be used as CPRI (CommonPublicRadioInterface, common public radio interface) frame head;

Transmitting handling process includes:

Step S103:BBU high level starts traffic scheduling, and scheduling baseband system carries out starting operation flow;

Step S104: baseband system, according to high-level scheduling, carries out Base-Band Processing, is respectively completed bit-level, symbol level process, carries out the signal processing of frequency domain and time domain afterwards;

Step S105: after Base-Band Processing completes, it is necessary to time domain data is carried out buffer memory, and the data of traffic scheduling are alignd with the CPRI frame head of transmitting, according to the frame head of CPRI, data are sent to RRU by CPRI interface;

The CPRI of step S106:RRU receives side, it is necessary to recovers the frame head of CPRI, and carries out base band time domain data reception according to CPRI frame head;

Step S107: the base band time domain data of reception, it is necessary to carry out data buffer storage, according to different bandwidth, processing delay etc., calculates IF process Startup time;

Step S108: base band data is processed by middle frequency link, respectively through what interpolation and filtering and frequency spectrum shift after, obtain digital intermediate frequency signal;

Step S109: digital intermediate frequency signal, then through DAC (Digitaltoanalogconverter, digital/analog converter) etc. radio circuit process, generate radio frequency analog signal, now alignment of data is to the GPS frame head of eating dishes without rice or wine recovered, and radiofrequency signal is sent, and TDD system needs to carry out closing LNA (LowNoiseAmplifier according to sequential of eating dishes without rice or wine, low-noise amplifier) open PA (PowerAmplifier, power amplifier) operation;

Reception handling process includes:

Step S110:RRU, according to the GPS frame head of eating dishes without rice or wine recovered, receives analogue signal, and TDD system needs to carry out closing LNA LNA according to sequential of eating dishes without rice or wine and opens PA operation. Afterwards by radiofrequency signal, through radio frequency link and digital-to-analog AD conversion, obtain digital intermediate frequency signal;

Step S112: after radio frequency link carries out the operations such as frequency spectrum shift, sampling and filtering, processes rf digital signal as base band time domain data;

Step S113: time domain data needs to carry out buffer memory, and waits the CPRI frame head moment;

After step S114:CPRI frame head arrives, time domain data is read out by RRU, through CPRI interface, time domain data is issued BBU;

Step S115:BBU side carries out cache flush mode according to CPRI frame head, it is thus achieved that with eat dishes without rice or wine the time domain data that aligns;

Step S116: time domain data needs the process through time domain and frequency domain, in the process through symbol level and bit-level, obtains the business datum of base band;

Step S117: after Base-Band Processing completes, reports high level by business datum.

Existing method is for base station equipment, it is necessary to complex eats dishes without rice or wine and CPRI frame head method of adjustment, and needs mass data buffer memory parts.

For terminal side equipment, it is absent from GPS and carries out clock alignment, and terminal and base station crystal oscillator frequency deviation can cause that frame head produces drift;Being absent from GPS and carry out the timing synchronization of PP1S, it is necessary to end side carries out air interface synchronization according to agreement, this synchronizes owing to arithmetic accuracy can produce drift; End side is matched base stations side sequential, can there is delayed reception and launch in advance, thus receiving different with the frame head launched; Be absent from eating dishes without rice or wine the fixed relationship with CPRI frame head, and CPRI frame head is fixed, and frame head drift of eating dishes without rice or wine; The position of terminal unit is moved, and produces to receive and launch shifting to an earlier date and delayed drift of frame head.

Summary of the invention

In order to solve the problems referred to above, the present invention proposes timing adjusting method and the device that a kind of base band is combined with radio frequency, it is possible to the movement of real-time servicing terminal, crystal oscillator frequency deviation.

In order to achieve the above object, the present invention proposes the timing adjusting method of a kind of base band, includes in each adjustment cycle:

The reception sequential of detection data and transmitting sequential, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, launch timing offset;

Produce public wireless electrical interface CPRI frame head, it is thus achieved that the side-play amount of frame head of eating dishes without rice or wine;

Reception timing offset according to described BBU, launch timing offset and the side-play amount of frame head of eating dishes without rice or wine, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount that data are launched;

Reception frame head and transmitting frame head to Base-Band Processing are adjusted, and the data of Base-Band Processing are flow to Row sum-equal matrix;

Export the data stream after described CPRI frame head, described RRU reception timing offset, transmitting timing offset, data receiver adjustment amount and the adjustment amount of data transmitting, adjustment.

Further, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, the mode of transmitting timing offset includes one below: GPS detection, air interface synchronization detect, finely tune detection.

Further, it is thus achieved that the reception timing offset of baseband processing unit BBU, launch timing offset and radio frequency remote unit RRU receives timing offset, launches timing offset, including:

The reception timing offset T of BBU_{bbu_rx}With transmitting timing offset T_{bbu_tx}It is expressed as T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA;

The reception timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3-T₁₂With transmitting timing offset T_{rru_tx}=T_{bbu_tx}+T_2a-T₁₂;

Wherein,

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced;

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU;

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU;

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

Further, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount that data are launched, including:

The data receiver adjustment amount T that Base-Band Processing is corresponding_{rx_adj}Adjustment amount T with data transmitting_{tx_adj}It is expressed as: T_{bbu_rx}=T_b'_{bu_rx}+T_{rx_adj}; T_{bbu_tx}=T_b'_{bu_tx}+T_{tx_adj};

T_b'_{bu_rx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle;

T_b'_{bu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle;

T_periThe time cycle during fine setting of expression cycle sequential.

In order to achieve the above object, the invention allows for the timing adjusting method of a kind of radio frequency, include in each adjustment cycle:

Receive public wireless electrical interface CPRI frame head, radio frequency remote unit RRU receives timing offset, launch adjustment amount, data stream that timing offset, data receiver adjustment amount and data are launched;

Recover described CPRI frame head;

Receive timing offset according to described RRU, launch timing offset, recover on the basis of frame head at CPRI, produce receive frame head and launch frame head, and the data frame head of radio frequency processing;

Intermediate frequency after output processing or zero intermediate frequency data.

In order to achieve the above object, the invention allows for the timing adjustment method and device of a kind of base band, including:

Time-series rules module, for detecting the reception sequential of data and launching sequential, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, launch timing offset;

Frame head generation module: be used for producing public wireless electrical interface CPRI frame head;

Sequential computing module, for obtaining the side-play amount of frame head of eating dishes without rice or wine, is additionally operable to the receptions timing offset according to described BBU, launches timing offset and the side-play amount of frame head of eating dishes without rice or wine, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount of data transmitting;

The data of Base-Band Processing for the reception frame head of Base-Band Processing and transmitting frame head are adjusted, and are flow to Row sum-equal matrix by the first timing adjustment module;

First interface module, is used for the data stream after exporting described CPRI frame head, described RRU reception timing offset, transmitting timing offset, data receiver adjustment amount and the adjustment amount of data transmitting, adjustment.

Preferably, the reception timing offset of time-series rules module acquisition baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, the mode of transmitting timing offset includes one below: GPS detection, air interface synchronization detect, finely tune detection.

Preferably, time-series rules module obtains the reception timing offset of baseband processing unit BBU, launches timing offset and radio frequency remote unit RRU reception timing offset, transmitting timing offset, including:

The reception timing offset T of BBU_{bbu_rx}With transmitting timing offset T_{bbu_tx}It is expressed as T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA; ;

The reception timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3_T₁₂With transmitting timing offset T_{rru_tx}=T_{bbu_rx}+T_2a-T₁₂;

Wherein,

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced;

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU;

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU;

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

Preferably, sequential computing module obtains data receiver adjustment amount corresponding to Base-Band Processing and the adjustment amount of data transmitting, including:

The data receiver adjustment amount T that Base-Band Processing is corresponding_{rx_adj}Adjustment amount T with data transmitting_{tx_adj}It is expressed as: T_{bbu_rx}=T_b'_{bu_rx}+T_{rx_adj}; T_{bbu_tx}=T_b'_{bu_tx}+T_{tx_adj};

T_b'_{bu_rx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle;

T_b'_{bu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle;

T_periThe time cycle during fine setting of expression cycle sequential.

In order to achieve the above object, the invention allows for the timing adjustment method and device of a kind of radio frequency, including:

Second interface module, for receiving public wireless electrical interface CPRI frame head, radio frequency remote unit RRU receives timing offset, launch adjustment amount, data stream that timing offset, data receiver adjustment amount and data are launched;

Frame head recovers module, is used for recovering described CPRI frame head;

Second timing adjustment module, for receiving timing offset according to described RRU, launch timing offset, recovers on the basis of frame head at CPRI, produces receive frame head and launch frame head, and the data frame head of radio frequency processing;

Transmitting-receiving controls module, is used for controlling radio-frequency antenna switch, intermediate frequency after output processing or zero intermediate frequency data.

Compared with prior art, apparatus and method of the present invention, base station equipment data and sequential processing flow process can be simplified, Business Processing Startup time is carried out according to sequential, data process and reach stream treatment, reduce the data storage operations of BBU and RRU, thus reducing equipment complexity and cost. Terminal unit frame head, the movement of real-time servicing terminal, crystal oscillator frequency deviation can be adjusted flexibly, be suitable for the transmitting of terminal simultaneously and receive frame head stalling characteristic and better adapt to the radio frequency processing functions such as terminal different frequency switching timing.

Accompanying drawing explanation

Below the accompanying drawing in the embodiment of the present invention being illustrated, the accompanying drawing in embodiment is for a further understanding of the present invention, is used for explaining the present invention, is not intended that limiting the scope of the invention together with description.

Fig. 1 is timing adjusting method in prior art;

Fig. 2 is that the base band that the embodiment of the present invention provides combines timing adjustment method and device with radio frequency;

Fig. 3 is the time diagram of embodiment of the present invention timing adjusting method;

Fig. 4 is the flow chart of embodiment of the present invention timing adjusting method;

Fig. 5 is the alien frequencies switching schematic diagram that the embodiment of the present invention three provides.

Detailed description of the invention

For the ease of the understanding of those skilled in the art, below in conjunction with accompanying drawing, the invention will be further described, can not be used for limiting the scope of the invention.

As in figure 2 it is shown, the timing adjusting method of the base band of embodiment of the present invention offer, include in each adjustment cycle:

The reception sequential of detection data and transmitting sequential, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, launch timing offset;

Produce public wireless electrical interface CPRI frame head, it is thus achieved that the side-play amount of frame head of eating dishes without rice or wine;

Reception timing offset according to described BBU, launch timing offset and the side-play amount of frame head of eating dishes without rice or wine, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount that data are launched;

Reception frame head and transmitting frame head to Base-Band Processing are adjusted, and the data of Base-Band Processing are flow to Row sum-equal matrix;

Export the data stream after described CPRI frame head, described RRU reception timing offset, transmitting timing offset, data receiver adjustment amount and the adjustment amount of data transmitting, adjustment.

The reception timing offset obtaining baseband processing unit BBU, the mode launching timing offset and radio frequency remote unit RRU reception timing offset, transmitting timing offset include one below: GPS detection, air interface synchronization detection, fine setting detect.

Obtain the reception timing offset of baseband processing unit BBU, launch timing offset and radio frequency remote unit RRU reception timing offset, transmitting timing offset, including:

The reception timing offset T of BBU_{bbu_rx}With transmitting timing offset T_{bbu_tx}It is expressed as T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA;

The reception timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3-T₁₂With transmitting timing offset T_{rru_tx}=T_{bbu_rx}+T_2a-T₁₂;

Wherein,

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced;

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU;

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU;

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

Obtain data receiver adjustment amount corresponding to Base-Band Processing and the adjustment amount of data transmitting, including:

The data receiver adjustment amount T that Base-Band Processing is corresponding_{rx_adj}Adjustment amount T with data transmitting_{tx_adj}It is expressed as: T_{bbu_rx}=T_b'_{bu_rx}+T_{rx_adj};T_{bbu_tx}=T_b'_{bu_tx}+T_{tx_adj};

T_b'_{bu_rx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle;

T_b'_{bu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle;

T_periThe time cycle during fine setting of expression cycle sequential.

As in figure 2 it is shown, the timing adjusting method of the radio frequency of embodiment of the present invention offer, it is characterised in that include in each adjustment cycle:

Receive public wireless electrical interface CPRI frame head, radio frequency remote unit RRU receives timing offset, launch adjustment amount, data stream that timing offset, data receiver adjustment amount and data are launched;

Recover described CPRI frame head;

Receive timing offset according to described RRU, launch timing offset, recover on the basis of frame head at CPRI, produce receive frame head and launch frame head, and the data frame head of radio frequency processing;

Intermediate frequency after output processing or zero intermediate frequency data.

As in figure 2 it is shown, the timing adjustment method and device of the base band of embodiment of the present invention offer, including:

Time-series rules module, for detecting the reception sequential of data and launching sequential, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, launch timing offset;

Frame head generation module: be used for producing public wireless electrical interface CPRI frame head;

Sequential computing module, for obtaining the side-play amount of frame head of eating dishes without rice or wine, is additionally operable to the receptions timing offset according to described BBU, launches timing offset and the side-play amount of frame head of eating dishes without rice or wine, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount of data transmitting;

The data of Base-Band Processing for the reception frame head of Base-Band Processing and transmitting frame head are adjusted, and are flow to Row sum-equal matrix by the first timing adjustment module;

First interface module, is used for the data stream after exporting described CPRI frame head, described RRU reception timing offset, transmitting timing offset, data receiver adjustment amount and the adjustment amount of data transmitting, adjustment.

The reception timing offset of time-series rules module acquisition baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, the mode of transmitting timing offset includes one below: GPS detection, air interface synchronization detect, finely tune detection.

Time-series rules module obtains the reception timing offset of baseband processing unit BBU, launches timing offset and radio frequency remote unit RRU reception timing offset, transmitting timing offset, including:

The reception timing offset T of BBU_{bbu_rx}With transmitting timing offset T_{bbu_tx}It is expressed as T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA;

The reception timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3-T₁₂With transmitting timing offset T_{rru_tx}=T_{bbu_rx}+T_2a-T₁₂;

Wherein,

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced;

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU;

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU;

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

Sequential computing module obtains data receiver adjustment amount corresponding to Base-Band Processing and the adjustment amount of data transmitting, including:

The data receiver adjustment amount T that Base-Band Processing is corresponding_{rx_adj}Adjustment amount T with data transmitting_{tx_adj}It is expressed as: T_{bbu_rx}=T_b'_{bu_rx}+T_{rx_adj}; T_{bbu_tx}=T_b'_{bu_tx}+T_{tx_adj};

T_b'_{bu_rx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle;

T_b'_{bu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle;

T_periThe time cycle during fine setting of expression cycle sequential.

As in figure 2 it is shown, the timing adjustment method and device of the radio frequency of embodiment of the present invention offer, including:

Second interface module, for receiving public wireless electrical interface CPRI frame head, radio frequency remote unit RRU receives timing offset, launch adjustment amount, data stream that timing offset, data receiver adjustment amount and data are launched;

Frame head recovers module, is used for recovering described CPRI frame head;

Second timing adjustment module, for receiving timing offset according to described RRU, launch timing offset, recovers on the basis of frame head at CPRI, produces receive frame head and launch frame head, and the data frame head of radio frequency processing;

Transmitting-receiving controls module, is used for controlling radio-frequency antenna switch, intermediate frequency after output processing or zero intermediate frequency data.

Embodiment one

Embodiment of the present invention device is divided into BBU side and RRU side two parts, with reference to Fig. 2.

BBU sidepiece divides and includes:

C201, time-series rules module: complete the time-series rules receiving and launching, it is possible to include various ways, GPS, air interface synchronization, fine setting detection algorithm etc.

C202, frame head generation module: after having powered on, namely utilize the clock that crystal oscillator provides, and produces fixing 10ms frame head, as CPRI frame head, and remains unchanged.

C203, sequential computing module: according to CPRI frame head, and the detected value of time-series rules module output, calculate reception really and transmitting is eated dishes without rice or wine the side-play amount of frame head. And the side-play amount of data receiver corresponding to Base-Band Processing and transmitting.

C204, the first timing adjustment module: the side-play amount according to the output of sequential computing module, reception and transmitting frame head to Base-Band Processing are adjusted, and the data of base band are flow to Row sum-equal matrix simultaneously.

C205, CPRI first interface module: complete the base band time domain data transmitting-receiving receiving and launching, the reception corresponding according to the radio frequency calculated and transmitting side-play amount, is handed down to RRU by the control word of CPRI, data or control passage.

RRU sidepiece divides and includes:

C211, CPRI second interface module: complete the base band time domain data transmitting-receiving receiving and launching, by the control word of CPRI, data or control passage, receives reception corresponding to the BBU radio frequency calculated and launches side-play amount.

C212, frame head recover module: recover the reception 10ms frame head of CPRI interface, and verify, utilize the Hyper Frame Number in CPRI agreement, according to CPRI data form, recover described CPRI frame head.

C213, the second timing adjustment module: timing adjustment module is according to the BBU reception issued and launches side-play amount, recover on the basis of frame head at CPRI, produces to receive and launch frame head and the data frame head needed in radio frequency processing.

C214, transmitting-receiving control module: transmitting-receiving controls the transmitting-receiving frame head that can directly produce according to timing adjustment module, adds the guard time of LNA and PA, LNA and PA is carried out switching manipulation.

With reference to Fig. 3, provide the sequential name definition of the embodiment of the present invention.

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced.

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU.

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU.

T_{bbu_rx_proc}Represent that BBU receives the physical layer process time of link.

T_{bbu_tx_proc}Represent the physical layer process time of BBU transmitting chain.

T_{bbu_rx}Represent that BBU's receives the link CPRI time domain data frame head side-play amount to CPRI frame head.

T_{bbu_tx}Represent the transmitting chain CPRI time domain data frame head side-play amount to CPRI frame head of BBU.

T_{rru_rx}Represent the side-play amount that the CPRI frame head of RRU receives to antenna opening.

T_{rru_tx}Represent the side-play amount that the CPRI frame head of RRU is launched to antenna opening.

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

T_gpsRepresent that CPRI frame head is eated dishes without rice or wine to GPS the side-play amount of frame head.

T_{adj_rx}Represent the skew adjustment amount receiving link.

T_{adj_tx}Represent the skew adjustment amount of transmitting chain.

T_periThe time cycle during fine setting of expression cycle sequential.

T_b'_{bu_tx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle.

T_b'_{bu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle.

The timing offset computational methods of the embodiment of the present invention are as follows, and to be referred to as computational methods be A_{Time_Calc}:

The reception of BBU and transmitting timing offset T_{bbu_rx}And T_{bbu_tx}, T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA;

The timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3-T₁₂And T_{rru_tx}=T_{bbu_rx}+T_2a-T₁₂;

BBU receives Business Processing side-play amount T_{bbu_rx}+ T_{bbu_rx_proc}Side-play amount T is started with transmitting business_{bbu_tx}-T_{bbu_tx_proc}。

According to period of time T_periCarry out timing cycles fine setting, receive link timing offset currency T_{bbu_rx}=T_b'_{bu_rx}+T_{rx_adj}, transmitting chain timing offset currency T_{bbu_tx}=T_b'_{bu_tx}+T_{tx_adj}。

As shown in Figure 4, it is as follows that the sequential that the base band of the embodiment of the present invention is combined with radio frequency adjusts handling process:

Step S401:BBU produces 10ms counting according to crystal oscillator, and will export 10ms pulse as CPRI frame head;

Step S402: initial time-series rules method can select according to device characteristics, and conventional detection method includes: GPS synchronization, air interface synchronization etc.;

Step S403: according to BBU timing offset computational methods A_{Time_Calc}, calculate the timing offset needed for BBU and RRU, and the side-play amount of RRU be handed down to RRU;

Step S404:BBU produces CPRI data receiver according to timing offset and launches frame head, and base band Business Processing receives and launches frame head;

Step S405: judge whether normal method can select sequential according to device characteristics, as normally then started base band Business Processing, otherwise jumps to 402 and again detects sequential.

Step S406: according to the S404 frame head driving data produced, Base-Band Processing flow process can accomplish complete flowing water state.

Step S407: in normal baseband processing procedure, according to period of time T_peri, carrying out cycle time-series rules, detection method can be the methods such as pilot tone estimation, as time order error or sequential adjustment order detected, it is thus achieved that period modulation amount T_{adj_rx}And T_{adj_tx}。

Step S408: according to BBU timing offset computational methods A_{Time_Calc}With period modulation amount T_{adj_rx}And T_{adj_tx}, calculate the sequential adjustment amount after period modulation, and produce data receiver and launch frame head. And the sequential adjustment amount of RRU that will calculate, it is handed down to RRU device.

Step S409: judge that whether cycle sequential adjustment amount is normal, it is judged that method can be different according to device characteristics, as normally then carried out cycle sequential adjustment, otherwise jumps to S407 cycle time-series rules again.

Step S40a: produce CPRI data receiver according to cycle timing offset and launch frame head, base band Business Processing receives and launches frame head, and enters base band Business Processing S407.

Step S411:RRU recovers the CPRI frame head of BBU.

Step S412: receive the BBU timing offset T issued_{rru_rx}And T_{rru_tx}。

Step S413: the timing offset T obtained according to the S410 CPRI frame head obtained and S411_{rru_rx}And T_{rru_tx}, produce the transmitting of RRU and receive frame frequency.

Step S414:RRU is according to the transmitting produced and receives frame frequency, and TDD system needs to carry out closing LNA LNA according to frame frequency and opens PA operation.

Step S415: according to the S413 frame head driving data produced, carries out frequency spectrum shift, interpolation, sampling and filtering etc. and processes, and handling process can accomplish complete flowing water state.

Embodiment two:

For base station equipment, owing to locking the reason of gps clock, the PP1S signal according to GPS, the reception of base station and transmitting clock of eating dishes without rice or wine all is lockable to the sequential of GPS, and the TA in Fig. 3 is zero.

Embodiment of the present invention handling process is constant, but part operation step to may select concrete method as follows:

Step S402: base station can lock gps clock, and can synchronize according to the PP1S of GPS, and according to this, crystal oscillator can be calibrated.

Step S405: can according to the lock-out state of GPS as judging sequential condition.

Step S407: according to the PP1S of GPS, can carry out the time-series rules in cycle, as detected timing skew, can carry out S408 and start cycle sequential adjustment compensation.

Step S409: can according to the lock-out state of GPS as judging sequential condition.

Embodiment three:

For terminal unit, or comprise termination function Relay equipment, it does not have GPS, and receive stagnant, launch in advance in base station equipment, the reception of terminal frame head of eating dishes without rice or wine with transmitting separates, and equipment mobility, causes that terminal unit needs to safeguard in time sequential.

Embodiment of the present invention handling process is constant, but part operation step to may select concrete method as follows:

Step S402: terminal can carry out air interface synchronization, is synchronized in base station network.

Step S403: during initial sequential calculates, first carries out down-going synchronous or receives link sequential, carrying out multi-upstream access, it is thus achieved that the propagation delay time TA of terminal and base station.

Step S405: can according to the physical layer process result of terminal, if downlink and uplink, demodulating physical channels performance are as basis for estimation. If demodulation is normal, it is believed that sequential adjustment is normal, if demodulation is abnormal, it is believed that sequential adjustment is abnormal.

Step S407: can according to pilot tone to physical link time be biased row estimation, as detected timing skew, can carry out S408 start cycle sequential adjustment compensate.

Step S409: can the tolerable intersymbol interference thresholding of terminal unit, as cycle sequential adjust state. The timing skew maximum of interference between is-greater-than symbol, it is believed that timing corrections is abnormal, less than sequential maximum, it is believed that normal.

Embodiment four:

For there is the terminal unit of specific demand, it is possible to according to the method for the embodiment of the present invention, each stage of BBU and RRU physical layer process is timed, and according to this timing information, it is achieved be strictly dependent on the function of sequential.

In super cell, the distance between base station is more than tens KM, and even up to hundreds of KM, during the signal incoming terminal equipment of different base station, time difference even can reach ms level. Now during nearby region measurement, terminal is in Serving cell flow process, and reception processes the time-domain signal of alien frequencies adjacent area, and according to the secondary descending sequential re-searching for alien frequencies adjacent area. For LTE system, the GAP measurement cycle is T_GAP, major-minor synchronizing cycle is T_SYN, add RRU frequency handover delay and frequency switching command propagation delay time, it is necessary to ensure to obtain alien frequencies time-domain signal time T_Time≥T_SYN。

According to embodiment of the present invention timing adjusting method, BBU and RRU start by set date operates, and completes the different-frequency measure function of super cell.

With reference to Fig. 5, concrete timing information is described. Embodiment of the present invention handling process is constant, but part operation step to may select concrete method as follows:

Step S406: according to the S406 subframe head timing instant produced, measure the cycle at the T1 reception MAC GAP issued, switch adjacent area frequency at T2 reception, and be handed down to RRU in the T3 moment, receive adjacent area frequency in T6 moment switchback, and be handed down to RRU in the T7 moment.In the T5 time period, namely descending PHY has T_TimeThe alien frequencies data of time carry out nearby region measurement.

After step S408:BBU carries out cycle sequential adjustment, produce the frame head receiving and launching, produce to receive the subframe head of link simultaneously, and safeguard subframe numbers.

After step S413:RRU carries out sequential adjustment, produce the frame head receiving and launching, the subframe head of the link of generation reception simultaneously, and produce the T8 moment of the T4 and Δ ems of the Δ sms after the subframe head of timing, need to meet T herein_GAP-Δs-Δe≥T_SYN。

Step S413: when radio frequency link processes, according to S413 T4 and the T8 moment produced, carries out frequency switching, it is ensured that T_GAPInterior BBU can obtain T_Time=T_GAPThe adjacent area time domain data of-Δ s-Δ e time, does not affect again the business outside the GAP cycle simultaneously.

It should be noted that; embodiment described above is for only for ease of those skilled in the art and understands; it is not limited to protection scope of the present invention; under the premise without departing from the inventive concept of the present invention, those skilled in the art to the made any apparent replacement and improvement etc. of the present invention all within protection scope of the present invention.

Claims (10)

1. the timing adjusting method of a base band, it is characterised in that include in each adjustment cycle:

The reception sequential of detection data and transmitting sequential, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, launch timing offset;

Produce public wireless electrical interface CPRI frame head, it is thus achieved that the side-play amount of frame head of eating dishes without rice or wine;

Reception timing offset according to described BBU, launch timing offset and the side-play amount of frame head of eating dishes without rice or wine, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount that data are launched;

Reception frame head and transmitting frame head to Base-Band Processing are adjusted, and the data of Base-Band Processing are flow to Row sum-equal matrix;

Export the data stream after described CPRI frame head, described RRU reception timing offset, transmitting timing offset, data receiver adjustment amount and the adjustment amount of data transmitting, adjustment.

2. timing adjusting method according to claim 1, it is characterized in that, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, the mode of transmitting timing offset includes one below: GPS detection, air interface synchronization detect, finely tune detection.

3. timing adjusting method according to claim 1, it is characterised in that obtain the reception timing offset of baseband processing unit BBU, launch timing offset and radio frequency remote unit RRU reception timing offset, transmitting timing offset, including:

The reception timing offset T of BBU_{bbu_rx}With transmitting timing offset T_{bbu_tx}It is expressed as T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA;

The reception timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3-T₁₂With transmitting timing offset T_rru__tx=T_{bbu_rx}+T_2a-T₁₂;

Wherein,

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced;

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU;

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU;

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

4. timing adjusting method according to claim 3, it is characterised in that obtain data receiver adjustment amount corresponding to Base-Band Processing and the adjustment amount of data transmitting, including:

The data receiver adjustment amount T that Base-Band Processing is corresponding_{rx_adj}Adjustment amount T with data transmitting_{tx_adj}It is expressed as: T_{bbu_rx}=T '_{bbu_rx}+T_{rx_adj};T_{bbu_tx}=T '_{bbu_tx}+T_{tx_adj};

T′_{bbu_rx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle;

T′_{bbu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle;

T_periThe time cycle during fine setting of expression cycle sequential.

5. the timing adjusting method of a radio frequency, it is characterised in that include in each adjustment cycle:

Receive public wireless electrical interface CPRI frame head, radio frequency remote unit RRU receives timing offset, launch adjustment amount, data stream that timing offset, data receiver adjustment amount and data are launched;

Recover described CPRI frame head;

Receive timing offset according to described RRU, launch timing offset, recover on the basis of frame head at CPRI, produce receive frame head and launch frame head, and the data frame head of radio frequency processing;

Intermediate frequency after output processing or zero intermediate frequency data.

6. the timing adjustment method and device of a base band, it is characterised in that including:

Time-series rules module, for detecting the reception sequential of data and launching sequential, it is thus achieved that the reception timing offset of baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, launch timing offset;

Frame head generation module: be used for producing public wireless electrical interface CPRI frame head;

Sequential computing module, for obtaining the side-play amount of frame head of eating dishes without rice or wine, is additionally operable to the receptions timing offset according to described BBU, launches timing offset and the side-play amount of frame head of eating dishes without rice or wine, it is thus achieved that data receiver adjustment amount that Base-Band Processing is corresponding and the adjustment amount of data transmitting;

The data of Base-Band Processing for the reception frame head of Base-Band Processing and transmitting frame head are adjusted, and are flow to Row sum-equal matrix by the first timing adjustment module;

First interface module, is used for the data stream after exporting described CPRI frame head, described RRU reception timing offset, transmitting timing offset, data receiver adjustment amount and the adjustment amount of data transmitting, adjustment.

7. timing adjustment method and device according to claim 6, it is characterised in that

The reception timing offset of time-series rules module acquisition baseband processing unit BBU, transmitting timing offset and radio frequency remote unit RRU receive timing offset, the mode of transmitting timing offset includes one below: GPS detection, air interface synchronization detect, finely tune detection.

8. timing adjustment method and device according to claim 6, it is characterized in that, time-series rules module obtains the reception timing offset of baseband processing unit BBU, launches timing offset and radio frequency remote unit RRU reception timing offset, transmitting timing offset, including:

The reception timing offset T of BBU_{bbu_rx}With transmitting timing offset T_{bbu_tx}It is expressed as T_{bbu_tx}=T_{bbu_rx}-T_2a-T_a3-TA; ;

The reception timing offset T of RRU_{rru_rx}=T_{bbu_rx}-T_a3-T₁₂With transmitting timing offset T_{rru_tx}=T_{bbu_rx}+T_2a-T₁₂;

Wherein,

T₁₂Represent the CPRI of BBU and the RRU propagation delay time introduced;

T_2aRepresent the CPRI mouth time domain data processing delay to antenna opening radiofrequency signal of RRU;

T_a3Represent the antenna opening radiofrequency signal processing delay to CPRI mouth time domain data of RRU;

TA represents the base station round time delay of eating dishes without rice or wine to terminal.

9. timing adjustment method and device according to claim 8, it is characterised in that sequential computing module obtains data receiver adjustment amount corresponding to Base-Band Processing and the adjustment amount of data transmitting, including:

The data receiver adjustment amount T that Base-Band Processing is corresponding_{rx_adj}Adjustment amount T with data transmitting_{tx_adj}It is expressed as: T_{bbu_rx}=T '_{bbu_rx}+T_{rx_adj}; T_{bbu_tx}=T '_{bbu_tx}+T_{tx_adj};

T′_{bbu_rx}Represent BBUT_periDuring period vernier sequential, the reception link timing offset in previous cycle;

T′_{bbu_tx}Represent BBUT_periDuring period vernier sequential, the transmitting chain timing offset in previous cycle;

T_periThe time cycle during fine setting of expression cycle sequential.

10. the timing adjustment method and device of a radio frequency, it is characterised in that including:

Second interface module, for receiving public wireless electrical interface CPRI frame head, radio frequency remote unit RRU receives timing offset, launch adjustment amount, data stream that timing offset, data receiver adjustment amount and data are launched;

Frame head recovers module, is used for recovering described CPRI frame head;

Second timing adjustment module, for receiving timing offset according to described RRU, launch timing offset, recovers on the basis of frame head at CPRI, produces receive frame head and launch frame head, and the data frame head of radio frequency processing;

Transmitting-receiving controls module, is used for controlling radio-frequency antenna switch, intermediate frequency after output processing or zero intermediate frequency data.