CN103905122A - Method and system for data transmission among Ir interfaces of double-module base station - Google Patents
Method and system for data transmission among Ir interfaces of double-module base station Download PDFInfo
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Abstract
The invention discloses a method and system for data transmission among Ir interfaces of double-module base station. The method comprises the steps that IQ modulation data to be transmitted are adjusted to an expected target value by adopting an AGC factor, are compressed according to a compression ratio and then are transmitted. An AGC module in the system is used for adjusting the IO modulation data to be transmitted to the expected target value by adopting the AGC factor. Through the adoption of the method and system for the data transmission among the Ir interfaces of the double-module base station, bandwidth occupied by data transmission between a BBU and an RRU is reduced, optical fiber occupied amount is reduced, and network deployment cost is lowered.
Description
Technical field
Fibre optic data transmission field between the Base Band Unit (BBU, Base Band Unit) that the present invention relates to mobile communication and radio frequency unit (RRU, Radio Remote Unit), relates in particular to the method and system of transfer of data between a kind of dual-mode base station Ir interface.
Background technology
At present, Wireless Telecom Equipment generally adopts the baseband extension pattern of BBU+RRU, and the interface between BBU and RRU is called Ir interface.With regard to baseband extension pattern for instance, such as the TD SDMA (TD-SCDMA of 3G, Time Division-Synchronous Code Division Multiple Access) and the timesharing Long Term Evolution (TD-LTE of 4G, Time Division Long Term Evolution), base station all adopts distributed deployment, between BBU and RRU, passes through fiber direct connection.The advantage of disposing is like this: BBU can be placed in machine room, and RRU can be deployed in 20km with in interior scope flexibly by fiber optic stretch.But such deployment has also brought two problems: first, between BBU and RRU, need transmitting high speed quadrature modulation (IQ) data, bandwidth demand is high, TD-LTE8 antenna 20MHz single carrier needs the transmission bandwidth of 9.8304Gbps, consume the fiber resource between a large amount of BBU and RRU, and along with the use of wideband RRU, as 40M frequency range RRU, this bandwidth demand also will be doubled and redoubled.Three TD-SCDMA/TD-LTE bimodulus RRU of its next website, need six pairs totally ten two optical fiber be connected with BBU, along with BBU integrated level increases and BBU concentrates and places, the community of covering gets more and more, scope is more and more wider, and the number of fibers and the length that need also can increase sharply.
Adjust according to speed, the TD-SCDMA cell data of six carrier wave eight antennas needs 2.4576Gbps bandwidth; The TD-LTE cell data of 20M8A needs 9.8304Gbps bandwidth, and TD-SCDMA/TD-LTE bimodulus needs 12.288Gbps bandwidth, needs to transmit with the optical channel load sharing of two 6.144Gbps.A bimodulus website, has three TD-SCDMA communities and three TD-LTE communities, needs altogether six pairs to be twelve-core optical fiber and BBU interconnection, BBU is connected framework as shown in Figure 1 with RRU's, fiber resource consumption is large, and it is high again that cost is laid in engineering construction, and bottleneck appears in cable tubing resource.
In sum, there is following problem in prior art:
(1) data transfer bandwidth demand is large: in bimodulus situation, carry six carrier wave TD-SCDMA carrier waves and add 20MHz TD-LTE, the data between single RRU and BBU just need the data bandwidth of 12.288Gbps, and bandwidth occupancy is large.Adopt the 6.144G optical module generally adopting now, need two pairs of Optical Fiber Transmission, even if use 10G optical module, also need two pairs of Optical Fiber Transmission under bimodulus scene, cost raises.
(2) optical fiber underutilization: in the scheme of prior art, transceiving data needs a pair of two core fibre transmission, every core fibre transfer of unidirectional data, be that every core fibre can only be received or send out, the transmission of a pair of two core fibres as shown in Figure 2, because every core fibre can only be received or send out, cause the transmission bandwidth of optical fiber not to be fully used.Limited is 6.144Gbps optical module speed, and the transmission bandwidth of optical fiber own does not make full use of.
(3), in Practical Project is built, for the construction of remote base station, if the optical fiber demand comparison conference of Ir interface brings regional area transmission line conduit resource to occur bottleneck, engineering construction difficulty, increases construction cost.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method and system of transfer of data between a kind of dual-mode base station Ir interface, has reduced the bandwidth that between BBU and RRU, transfer of data takies, and optical fiber occupancy, has reduced network design cost.
For achieving the above object, technical scheme of the present invention is achieved in that
A method for transfer of data between dual-mode base station Ir interface, the method comprises:
By initial quadrature modulation IQ data waiting for transmission, adopt the automatic gain control AGC factor to adjust to re-set target value and compress rear transmission according to compression ratio.
Wherein, described by initial IQ data waiting for transmission, adopt the AGC factor to adjust to re-set target value, be specially: the IQ data described waiting for transmission unification of difference reception or transmitted power is adjusted on same power.
Wherein, described in, compress rear transmission and be specially: the IQ Deta bearer after compression is transmitted on AxC transmission unit to the IQ data parallel transmission of the described AGC factor after with described compression;
Multiple AxC transmission units form Ir Frame; Ir Frame is supported the mixed biography of dual mode data, and an AxC transmission unit can transmit two groups of IQ data.
Wherein, the method also comprises: after the IQ data after the described compression of AxC transmission unit carrying are configured based on configuration information, transmit again;
Described configuration information at least comprises: bimodulus standard information, aerial information, carrier information, sampling point information.
Wherein, the method also comprises: described Ir Frame carries indication information transmission;
Described indication information at least comprises: bimodulus standard indication information, data compression indication information.
Wherein, the method also comprises:
At data sending terminal, configuration is multiplexed into the IQ data acquisition described waiting for transmission of different wave length on an optical fiber and transmits with uni-core bidirectional transmission mechanism; At data receiver, the IQ data demultiplexing receiving is recovered to former IQ data.
A system for transfer of data between dual-mode base station Ir interface, comprises Base Band Unit BBU and radio frequency unit RRU, and when transmitting uplink data, RRU comprises AGC module and compression module, and BBU comprises decompression module; When downlink data transmission, BBU comprises AGC module and compression module, and RRU comprises decompression module; Wherein,
The described AGC module of RRU, BBU side, for by initial IQ data waiting for transmission, adopts the AGC factor to adjust to re-set target value.
The described compression module of described RRU, BBU side, for compressing the IQ data after the adjustment of the AGC factor according to compression ratio;
The described decompression module of described RRU, BBU side, for decompressing the IQ data after compression.
Wherein, described AGC module, is further used for difference to receive or the IQ data described waiting for transmission unification of transmitted power is adjusted on same power.
Wherein, described compression module, is further used for the IQ Deta bearer after compression to transmit on AxC transmission unit, the IQ data parallel transmission of the described AGC factor after with described compression; Multiple AxC transmission units form Ir Frame; Ir Frame is supported the mixed biography of dual mode data, and an AxC transmission unit can transmit two groups of IQ data.
Wherein, described compression module, transmits after being further used for the IQ data after the described compression of AxC transmission unit carrying to be configured based on configuration information again; Described configuration information at least comprises: bimodulus standard information, aerial information, carrier information, sampling point information.
The present invention, by IQ data waiting for transmission, adopts the AGC factor to adjust to re-set target value, and compresses rear transmission according to compression ratio.Adopting the present invention, is after IQ data compression, to transmit, and has reduced the transmission of data volume, thereby has reduced the bandwidth that between BBU and RRU, transfer of data takies, and optical fiber occupancy, has reduced network design cost.
Brief description of the drawings
Fig. 1 is the configuration diagram that existing BBU is connected with RRU;
Fig. 2 is the schematic diagram of existing a pair of twin-core fiber transmission;
Fig. 3 is the Ir frame format schematic diagram that the Ir frame format of incompressible transfer of data is converted to the transfer of data of compression;
Fig. 4 is the system architecture schematic diagram of data compression of the present invention;
Fig. 5 is the contrast schematic diagram of the non-compression of single mode and bimodulus compression data format;
Fig. 6 is the structural representation of the Frame that is made up of multiple AxC transmission units of the present invention;
Fig. 7 is the multiplex/demultiplex configuration diagram that the present invention adopts uni-core bidirectional;
Fig. 8 is the system architecture schematic diagram of uni-core bidirectional of the present invention.
Embodiment
Basic thought of the present invention is: after adopting data compression, transmit, the data after compression are transmitted in the mixed biography mode of bimodulus, adopts single-core fiber transmitted in both directions in compression and mixed the biography on basis of bimodulus.
The method of transfer of data between dual-mode base station Ir interface of the present invention, comprising: by initial quadrature modulation IQ data waiting for transmission, adopt the automatic gain control AGC factor to adjust to re-set target value, and compress rear transmission according to compression ratio.
Further, by initial IQ data waiting for transmission, adopt the AGC factor to adjust to re-set target value, be specially: the IQ data described waiting for transmission unification of difference reception or transmitted power is adjusted on same power.
Further, compressing rear transmission is specially: the IQ Deta bearer after compression is transmitted on AxC transmission unit, the IQ data parallel transmission of the AGC factor after with described compression, and the configuration AGC factor transmission that circulates in 2048 sampled point transport process, processing like this benefit is: because the processing of the AGC factor before compression is most important, therefore, the transmission that circulates in 2048 sampled point transport process of the configuration AGC factor, even if ensured that the loss of data AGC factor also can not lose, to guarantee follow-up IQ data compression effect.
Here, with regard to AxC transmission unit, what AxC identified is a 32bit data transmission unit, because in wireless system, the data of AxC transmission are corresponding with some concrete carrier wave m, antenna n, so identify with AxC in the time of distribute data transmission unit.
Further, multiple AxC transmission units form Ir Frame; Ir Frame is supported the mixed biography of dual mode data, and an AxC transmission unit can transmit two groups of IQ data.
Further, the method also comprises: after the IQ data after the described compression of AxC transmission unit carrying are configured based on configuration information, transmit again.Wherein, configuration information at least comprises: bimodulus standard information, aerial information, carrier information, sampling point information.
Further, the method also comprises: described Ir Frame carries indication information transmission.Wherein, indication information at least comprises: bimodulus standard indication information, data compression indication information.
Further, the method also comprises: at data sending terminal, configuration is multiplexed into the IQ data acquisition described waiting for transmission of different wave length on an optical fiber and transmits with uni-core bidirectional transmission mechanism; At data receiver, the IQ data demultiplexing receiving is recovered to former IQ data.
A system for transfer of data between dual-mode base station Ir interface, comprising: BBU and RRU.Wherein, when transmitting uplink data, RRU specifically comprises AGC module and compression module, and BBU specifically comprises decompression module; When downlink data transmission, BBU specifically comprises AGC module and compression module, and RRU specifically comprises decompression module.
The function of each functional module of RRU and BBU side is similar, no matter RRU side or the AGC module of BBU side, be all for by initial IQ data waiting for transmission, adopt the AGC factor that large-signal, small-signal are adjusted to a re-set target value scope, to reduce peak-to-average force ratio.No matter RRU side or the compression module of BBU side is all for the IQ data after the adjustment of the AGC factor are compressed according to compression ratio.No matter RRU side or the decompression module of BBU side, for decompressing the IQ data after compression.
Further, AGC module is further used for the IQ data described waiting for transmission unification of difference reception or transmitted power to adjust on same power.
Further, compression module is further used for the IQ Deta bearer after compression to transmit on AxC transmission unit, the IQ data parallel transmission of the described AGC factor after with described compression; Multiple AxC transmission units form Ir Frame; Ir Frame is supported the mixed biography of dual mode data, and an AxC transmission unit can transmit two groups of IQ data.
Further, compression module transmits after being further used for the IQ data after the described compression of AxC transmission unit carrying to be configured based on configuration information again; Described configuration information at least comprises: bimodulus standard information, aerial information, carrier information, sampling point information.
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail.
Optimal case of the present invention is the scheme that data compression, the mixed biography of dual mode data, uni-core bidirectional technology are combined, and adopts this optimal case, the fiber count in existing TDS/TDL bimodulus Ir data transmission scheme can be reduced to 1/4th.In the time that mobile communication networking is applied, save a large amount of fiber resources, reduced network design cost.Following compressing data, the mixed biography of data, uni-core bidirectional technology are set forth respectively.
One, the compression of Ir interface data to be transmitted between BBU and RRU
Interface between BBU and RRU is Ir interface, conventionally uses bearing optical fiber, is mainly used in transmitting control information and the IQ data of Operation and Maintenance.Existing scheme is to adopt original IQ transfer of data, can take massive band width, large to the demand of number of fibers.Data compression of the present invention can adopt the non-uniform quantizing A rule compression algorithm of optimization, meeting under the prerequisite of mobile communication equipment specification index request, original IQ data can be compressed, compression ratio can be set in advance, such as being compressed to 7bit from 15bit, can reduce half to the demand of number of fibers, and, the present invention adopts data compression, continue to meet performance before make demands under, can complete by limited bandwidth the reliable effectively transmission of big data quantity.For described A rule compression algorithm, what in non-uniform quantizing method, commonly use is that A leads compression algorithm, and the A of the optimization that we carry leads compression algorithm, by emulation is optimized the A value of rate to LTE business characteristic, makes to quantize compression on performance impact less.
The Ir data frame format of the incompressible transfer of data of existing scheme is converted to the schematic diagram of the Ir data frame format of the transfer of data of the present invention program's compression, as shown in Figure 3, the Ir frame format of the incompressible transfer of data of Fig. 3 comprises the control information of 1bit and the IQ data of 15bit, the Ir data frame format of the transfer of data of the compression obtaining after IQ data compression comprises the control information of 1bit, automatic gain control (AGC) factor of 1bit and the IQ data of 7bit.As shown in Figure 3, the transmission quantity of IQ data obviously reduces, and can not take too much like this transmission bandwidth in the time that Ir interface transmits.
Here, add the effect of the AGC factor to be: by the AGC factor, the IQ data unification of difference reception or transmitted power to be adjusted in same power bracket, to facilitate follow-up IQ data compression.
Here, data compression system Organization Chart as shown in Figure 4, totally comprise: when RRU or BBU mono-side are used for data compression, before data compression, carry out the AGC module of power adjustment, the compression module that carries out data compression, corresponding opposite side comprises the decompression module that carries out data decompression while being used for data decompression.In addition, also comprise the radio frequency processing module of RRU, and the baseband processing module of BBU.
Concrete, based on the system architecture shown in Fig. 4, when the upstream data from RRU to BBU is processed, data compression, in RRU side, generally comprises AGC module and compression module, and corresponding BBU side has a decompression module; When downlink data from BBU to RRU is processed, be compressed in BBU side, also comprise AGC module and compression module, corresponding RRU side has decompression module.Wherein, AGC module, for the amplitude of the digital signal of transmitting on Ir interface is estimated, and the IQ data unification of difference reception or transmitted power is adjusted to the set goal value, desired value is same power as expected, the AGC process that AGC module is carried out difference can be received or the signal unification of transmitted power is adjusted on same power, convenient compression processing below.Compression module can adopt various existing compression algorithms and compression ratio, as long as make signal lossless or pass through Ir interface compared with small loss.
Use the above-mentioned data compression of Ir interface, can greatly reduce the transmission bandwidth requirement to Ir interface, reduce optical fiber and take.For example, if adopt 7bit data compression, bandwidth will reduce by half than original requirement.Realize single fiber by dual rate compress technique and support bimodulus, a bimodulus RRU only needs a twin-core fiber, bimodulus TDS and TDL is zoomed out to eight passage three sector base stations and need only 6 core fibres.
Two, dual mode data is mixed passes
Optical fiber between BBU and RRU reduces, if dual-mode base station, just must the mixed biography of supported data and form instruction.AxC transmission unit of the present invention is for carrying the IQ data after the compression by obtaining after above-mentioned data compression, and " AxC " represents the product number of antenna channels number and carrier number; Each AxC transmission unit can transmit the IQ data of 1 carrier wave of 1 antenna.The mixed Ir Frame passing of multiple AxC transmission unit composition datas.In order to know that the packed data of receiving is any standard of supporting in bimodulus standard on earth, the indication information that also need to carry any standard in being used to indicate bimodulus standard in the mixed Frame passing of described data, can carry at afterbody or the head of the mixed Frame passing of described data.Concrete data frame format and indication information, be described below:
The contrast schematic diagram of the non-compression of existing scheme single mode and the present invention program's bimodulus compression data format, as shown in Figure 5, every behavior 30bit, an AxC transmission unit in corresponding Ir Frame, transmit an IQ sampled point at the each AxC transmission unit of non-compact model, transmit two IQ sampled points and two AGC factor bit at the each AxC transmission unit of compact model.Every kind of standard of every antenna has a 4bit AGC factor, and every 2048 sampled points recalculate the AGC factor one time, calculates an AGC factor and starts transmission at every 1ms section start.The AGC factor is transmitted with data, transmits at the 0th and the 15bit of AxC, and each AGC factor 4bit, just can transmit with 4 sampled points.The importance of considering link error code factor and the AGC factor, the AGC factor is taked to send in cycles in 2048 sampled points, ensures and in the situation that losing indivedual data, also can not lose the AGC factor.
In Fig. 5, A0S0 represents the 0th sampled point IQ data of the 0th antenna totally 14 bit, and the rest may be inferred for AmSn.What in Fig. 5, describe is data format, need encapsulate data in the AxC transmission unit of CPRI frame the corresponding AxC transmission unit of a line in Fig. 5 on Ir interface while transmission.In the process of encapsulation mapping, realize the mixed biography of data.Fig. 6 is the data frame format schematic diagram of the mixed a kind of configuration passing of supported data in the basic frame of CPRI, Frame comprises control word and AxC transmission unit, wherein, front m AxC transmission unit passes TDL data, n-m AxC transmission unit passes TDS data, and wherein m can dynamically adjust according to TDS/TDL cell configuration situation, as TDL bandwidth reduces and the increase of TDS contained fan, can be by P to moving to left, m reduces.N is the value with optical fiber rate variation, and when when when 5Gbps light transmission rate, n is 32,6.144Gbps light transmission rate, n is 40,10Gbps light transmission rate, n is 64.Not only can realize the discharge of TDL, TDS order by dynamic-configuration, also can realize staggered discharge, to realize effective utilization of deleting the AxC resource in the process of building in district dynamic.For CPRI, CPRI frame is IQ data+administrative messag encapsulation format on Ir interface.
By the above-mentioned description to the mixed Frame passing of supported data, the configuration of IQ data transmission channel is described to (" IQ data channel ", refers to the part of transmitting IQ data in CPRI frame here, also can be called the configuration of AxC transmission unit).IQ data transmission channel can be understood as the configuration information how data of companion data frame transmission are transmitted, follow-up all referred to as configuration information.CPRI frame is as a bulk container, wherein each AxC transmission unit can be regarded a small container as, can specify in and in this small container, transmit in TDS, TDL or LTE-A bimodulus standard information if which kind of standard, aerial information are if which antenna, carrier information are if which carrier wave, sampling point information are as the data of which sampled point.After configuring according to described configuration information, just AxC transmission unit can be mapped to and in CPRI frame, send reception.The advantage of dynamic-configuration is along with network application situation is dynamically adjusted TDS, TDL or the transmission accounting of LTE-A in optical fiber, to accomplish effective utilization of fiber resource.If early stage is taking TDS as main, AxC transmission unit is all configured to TDS, and along with the popularization of TDL application, the configuration of TDS cell carrier reduces, and on corresponding minimizing optical fiber, the configuration of the AxC position of TDS, increases the configuration of the AxC transmission unit of TDL.
Adopt after the mixed Frame passing of above-mentioned supported data, when RRU access, BBU also needs to inform by message whether the data after RRU are packed data, what the AxC transmission unit of Frame carried is the data of which kind of standard, as TDS, TDL or FDD etc., therefore, in described configuration information, need to increase indication information, concrete, increase standard indication information, to facilitate the differentiation in the mixed biography of dual mode data and single mode transfer of data; Increase data compression indication information, whether instruction RRU carries out compression/decompression processes.
Configuration information is as shown in table 1, and table 1, for IQ data channel configuration IE table, has increased standard indication information, and the business datum of instruction transmission is the data of TDS, TDL or LTE-A, and transmit leg and recipient carry out encapsulation and the parsing of data according to this configuration.On Ir interface, increase data compression indication information, as the information in the data compression instruction IE of table 2, dynamically indicate RRU data whether to compress for BBU simultaneously.Under 7bit compression scene, the data after compression only need take the AxC transmission unit (an AxC transmission unit is 30bit, carries the IQ data of a sampled point in non-compression situation) of half.While compression as 20M8 antenna LTE data, in the basic frame of Ir Frame, account for 64 AxC positions, and take 32 AxC positions after compression.
Table 1
Table 2
Data after data compression and the mixed biography of data, as the IQ data of TDS6 carrier wave 8 antennas and TDL20M8 antenna, 12.5Gbps altogether, can, with the optical module transmission of 6.144G, need the only requirement of a pair of optical fiber of now falling into of two pairs of optical fiber originally.
Three, single-core fiber transmitted in both directions
On above-mentioned supported data compression and the mixed basis passing of support, the present invention can also further reduce optical fiber in conjunction with single fiber bi-directional technology and take.Single-core fiber transmitted in both directions is a development in recent years ratio optical transport technology faster, main wavelength-division or the use single wavelength of adopting utilizes the transmitting physical principle of light to complete single fiber transmission, and equipment form can be divided into simplex optical module or single fiber bi-directional transmission converter.Simplex optical module is inner by dual wavelength CWDM, and by receipts/send out to be combined in single optical fibre and transmit, as shown in Figure 7, Fig. 7 is the multiplex/demultiplex Organization Chart of employing uni-core bidirectional to main technical principle figure, and MUX and DEMUX are multiplexers.
It is to adopt optical wavelength-division multiplex (WDM that the present invention realizes single-core fiber transmitted in both directions, Wavelength Division Multiplexing) technology, WDM technology is the optical carrier that simultaneously transmits multiple wavelength in an optical fiber, and each light carrier can pass through FDM or TDM mode, carry separately multi-channel analog or multiply digital signals, its general principle is by the optical signal set of different wave length (multiplexing) altogether at transmitting terminal, and be coupled in same optical fiber on lightguide cable link and transmit, the signal of the different wave length of again these being combined at receiving terminal is (demultiplexing) separately, and be for further processing, after recovering original signal, send into different terminals.
Adopt data compression in conjunction with single fiber bi-directional technology; can realize number of fibers is reduced to half again; and base station equipment is without upgrading, every sector, base station only needs 1 core fibre, and website 3 sector are from 12 core fibres of existing scheme; reduce to 3 cores; be about originally 1/4, if be applied in bimodulus TD-SCDMA and TD-LTE is upper, then adopt the mixed biography of bimodulus and data allocations and indicating mechanism; can quick solution existing network Ir interface rate not enough and take the too much problem of optical fiber, reduce network design cost.As shown in Figure 8, BBU couples together plug-in three RRU by OFD by Ir interface in the connection of Ir interface.
In sum; the present invention is by combining data compression, the mixed biography of data and uni-core bidirectional transmission; thereby the Ir interface optical fiber reducing between BBU and RRU takies; solve the problem of the fiber bandwidth speed deficiency between TD-SCDMA and TD-LTE dual-mode base station BBU and the RRU of current real network application; compression has reduced rate requirement, and uni-core bidirectional has reduced optical fiber and taken, and number of fibers requires greatly to reduce; reduce the cost of laying optical fiber, thereby realize network rapid deployment.The solution of the present invention is to analyze with the application scenarios of TD-SCDMA and these two kinds of bimodulus standards of TD-LTE, but the present invention is not limited to this application scenarios, can be widely used between other standards BBU and RRU that Ir interface optical fiber takies scene, also can be applied to the scene of TD-SCDMA, TD-LTE single mode, under single mode scene, only consider that data compression and uni-core bidirectional transmission combine.Wherein, uni-core bidirectional transmission mechanism is applied to TD-SCDMA and TD-LTE bimodulus interface, do not distinguish wireless standard, both can be for the interconnection between between TD-SCDMA and TD-LTE base station and radio frequency unit, also can be used for the scene of the 2G base station fiber optic stretch such as GSM, that is: the solution of the present invention also can be supported the Optical Fiber Transmission between BBU and the RRU of 2G/3G/4G.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. a method for transfer of data between dual-mode base station Ir interface, is characterized in that, the method comprises:
By initial quadrature modulation IQ data waiting for transmission, adopt the automatic gain control AGC factor to adjust to re-set target value and compress rear transmission according to compression ratio.
2. method according to claim 1, it is characterized in that, described by initial IQ data waiting for transmission, adopt the AGC factor to adjust to re-set target value, be specially: the IQ data described waiting for transmission unification of difference reception or transmitted power is adjusted on same power.
3. method according to claim 2, is characterized in that, described in compress rear transmission and be specially: the IQ Deta bearer after compression is transmitted on AxC transmission unit to the IQ data parallel transmission of the described AGC factor after with described compression;
Multiple AxC transmission units form Ir Frame; Ir Frame is supported the mixed biography of dual mode data, and an AxC transmission unit can transmit two groups of IQ data.
4. method according to claim 3, is characterized in that, the method also comprises: after the IQ data after the described compression of AxC transmission unit carrying are configured based on configuration information, transmit again;
Described configuration information at least comprises: bimodulus standard information, aerial information, carrier information, sampling point information.
5. method according to claim 3, is characterized in that, the method also comprises: described Ir Frame carries indication information transmission;
Described indication information at least comprises: bimodulus standard indication information, data compression indication information.
6. according to the method described in claim 1 to 5 any one, it is characterized in that, the method also comprises:
At data sending terminal, configuration is multiplexed into the IQ data acquisition described waiting for transmission of different wave length on an optical fiber and transmits with uni-core bidirectional transmission mechanism; At data receiver, the IQ data demultiplexing receiving is recovered to former IQ data.
7. a system for transfer of data between dual-mode base station Ir interface, comprises Base Band Unit BBU and radio frequency unit RRU, it is characterized in that, when transmitting uplink data, RRU comprises AGC module and compression module, and BBU comprises decompression module; When downlink data transmission, BBU comprises AGC module and compression module, and RRU comprises decompression module; Wherein,
The described AGC module of RRU, BBU side, for by initial IQ data waiting for transmission, adopts the AGC factor to adjust to re-set target value.
The described compression module of described RRU, BBU side, for compressing the IQ data after the adjustment of the AGC factor according to compression ratio;
The described decompression module of described RRU, BBU side, for decompressing the IQ data after compression.
8. system according to claim 7, is characterized in that, described AGC module, is further used for difference to receive or the IQ data described waiting for transmission unification of transmitted power is adjusted on same power.
9. system according to claim 8, is characterized in that, described compression module is further used for the IQ Deta bearer after compression to transmit on AxC transmission unit, the IQ data parallel transmission of the described AGC factor after with described compression; Multiple AxC transmission units form Ir Frame; Ir Frame is supported the mixed biography of dual mode data, and an AxC transmission unit can transmit two groups of IQ data.
10. system according to claim 9, is characterized in that, described compression module transmits after being further used for the IQ data after the described compression of AxC transmission unit carrying to be configured based on configuration information again; Described configuration information at least comprises: bimodulus standard information, aerial information, carrier information, sampling point information.
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