CN101500338B - Method and system for channel correction on general public wireless interface - Google Patents
Method and system for channel correction on general public wireless interface Download PDFInfo
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- CN101500338B CN101500338B CN2008100863528A CN200810086352A CN101500338B CN 101500338 B CN101500338 B CN 101500338B CN 2008100863528 A CN2008100863528 A CN 2008100863528A CN 200810086352 A CN200810086352 A CN 200810086352A CN 101500338 B CN101500338 B CN 101500338B
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Abstract
The invention discloses a method for carrying out channel correction on a general public wireless interface. The method comprises the following steps: actuated correcting signals are injected at one side of each of at least two intermediate radio frequency channels; after passing through the corresponding intermediate radio frequency channels, the actuated correcting signals collect correcting signals output by the other sides of the at least two intermediate radio frequency channels to obtain corresponding collected correcting signals; the actuated correcting signals and the collected correcting signals correct a signal transmission mechanism through the general public wireless interface, and then are transmitted by the general public wireless interface; the collected signals and the actuated signals of the at least two intermediate radio frequency channels are compared respectively, and consistency variation parameters of the at least two intermediate radio frequency channels are obtained; and the intermediate radio frequency channels are compensated according to the consistency variation parameters. By adopting the method, the intermediate radio frequency channels can be corrected through a CPRI interface.
Description
Technical field
The present invention relates to the communications field, particularly a kind of method and system of channel correction on general public wireless interface.
Background technology
Common public radio interface (Common Public Radio Interface is called for short " CPRI ") is the standard of being published by the many companies of industry cooperation about mobile communication wireless inside of base station key interface.The CPRI standard is the public standard of industry about this key interface, and the universal standard of the crucial internal interface in a cover base station is provided.CPRI is responsible for defining the crucial internal interface of the wireless base station between radio equipment controller (Radio EquipmentController is called for short " REC ") and the wireless device (Radio Equipment is called for short " RE ").The purpose of formulating this standard is to create the opening market towards cellular basestation, thereby reduces for a long time always huge development amount and the expensive cost that accompanies with base station design significantly.
A design about the third generation (3rd Generation is called for short " 3G ") base stations in mobile communication system is absorbed in the cooperation of CPRI industry, and this design is divided into a wireless portion and a control section to the wireless base station by specifying a new interface.This makes the various piece of base station can both be better benefit from the technological progress in field separately.
For whole wireless industry is benefited, the CPRI standard can be obtained by disclosed channel.For Virtual network operator, crucial benefit is can obtain abundanter wireless base station product line and dispose planning with the shorter temporal adaptation of introducing to the market in all-network.The CPRI standard also makes base station manufacturer and parts suppliers can be absorbed in the relevant research and development activity of its core competitiveness simultaneously.The CPRI standard also can be used for new architecture, and is not subject to module measure or the division of predefined function.
The cooperation of CPRI industry can not only make base station manufacturer concentrate on energy in the research and development of core technology ability, and can be used in the equipment that different vendor makes.The topmost benefit that this standard is brought is, allows the new technology that is introduced into be able to faster development, and makes base station manufacturer provide abundant more product line for operator, with the shorter time product invested market simultaneously.Simultaneously operator can benefit from also that product is more widely selected, the further raising of solution and network design efficient.
The original enterprise of CPRI is devoted to start emulative mobile network's parts industry with of one mind, and by open CPRI interface, whole wireless industry is benefited.CPRI will be to existing standardization body, as 3G (Third Generation) Moblie partner program (3rd Generation Partnership Project, be called for short " 3GPP ") play supplementary function, the general-purpose interface of its exploitation will be applied in the wireless base station product of mobile system.
For the 3G mobile communication system, such as Wideband Code Division Multiple Access (WCDMA) (Wideband Code DivisionMultiple Access, be called for short " WCDMA "), the CPRI standard is used to realize first and second layer (L1, the L2) communication protocol between baseband control unit and the radio frequency unit.Based on the CPRI standard, can improve the versatility of interface between Base Band Unit and the radio frequency unit, also help realizing between the base band of different vendor and the radio-frequency module interconnected.
In multiaerial system, often there is inconsistency in middle radio-frequency channel, comprises the parameters such as gain, phase place and time delay of passage.The inconsistency of these passages can have a strong impact on the performance of system.Therefore, need the centering radio-frequency channel to proofread and correct design, the inconsistency of different passages on the middle radio-frequency module is proofreaied and correct, can be consistent with the characteristic that keeps different middle radio-frequency channel.
In realizing process of the present invention, the inventor finds, current CPRI standard is not supported the transmission to correction signal, and then under the situation that correction signal need be transmitted by the CPRI interface, can't proofread and correct the centering radio-frequency channel, thereby can't solve in the multiaerial system problem of inconsistency of middle radio-frequency channel.
Summary of the invention
The embodiment of the invention provides a kind of method of channel correction on general public wireless interface, solved current under correction signal need the situation by CPRI interface transmission, the technical problem of can't the centering radio-frequency channel proofreading and correct.
The method of the embodiment of the invention is achieved by the following technical solution:
Inject the correction signal of excitation at least in a side of two middle radio-frequency channels;
Behind the radio-frequency channel, gather the correction signals of described at least two middle radio-frequency channel opposite side outputs, the correction signal of being gathered accordingly during the correction signal process of described excitation is corresponding;
The correction signal of described excitation and the correction signal of the collection common public radio interface correction signal transmission mechanism by being provided with is transmitted by common public radio interface;
The acquired signal of more described at least two middle radio-frequency channels and pumping signal respectively obtain the consistency difference parameter of described at least two middle radio-frequency channels;
According to described consistency difference parameter, radio-frequency channel in described is compensated.
In addition, the embodiment of the invention also provides a kind of system of channel correction on general public wireless interface, and described system comprises excitation signal generation unit, correction signal transmission unit, acquired signal unit, channel compensation unit;
Described excitation signal generation unit produces the correction signal of excitation, and injects a side of at least two radio-frequency channels;
Described acquired signal unit obtains correction signal in the opposite side collection of described at least two middle radio-frequency channels through behind described at least two middle radio-frequency channels;
Described correction signal transmission unit transmits the correction signal of the excitation that described excitation signal generation unit produces and the correction signal that described acquired signal unit is gathered by the transmission mechanism that is provided with;
Described channel compensation unit is the correction signal of the collection of more described at least two middle radio-frequency channels and the correction signal of excitation respectively, obtain the consistency difference parameter of described at least two middle radio-frequency channels, and, radio-frequency channel in described is compensated according to described consistency difference parameter.
Technique scheme has following beneficial effect: in embodiments of the present invention, by the correction design of radio-frequency channel in multiaerial system, introducing and the correction signal transmission mechanism on the corresponding C PRI interface, realized under the situation that correction signal need be transmitted by the CPRI interface, the purpose that proofread and correct the centering radio-frequency channel, guaranteed in multiaerial system the consistency of middle radio-frequency channel parameter.
Description of drawings
The logical construction schematic diagram of the channel correction on general public wireless interface that Fig. 1 provides for the embodiment of the invention 1;
The physics realization structure chart of the channel correction on general public wireless interface that Fig. 2 provides for the embodiment of the invention 1;
The method flow diagram of the channel correction on general public wireless interface that Fig. 3 provides for inventive embodiments 1;
Data transmission timing graph of a relation on the CPRI interface under the tdd mode that Fig. 4 provides for the embodiment of the invention 2;
Correction data transmission schematic diagram under the tdd mode that Fig. 5 provides for the embodiment of the invention 2 on the CPRI interface;
The definition schematic diagram in IQ data field and control block in the CPRI interface frame that Fig. 6 provides for the embodiment of the invention 3;
HDLC information is transmitted schematic diagram in the CPRI interface that Fig. 7 provides for the embodiment of the invention 3;
Fig. 8 is the system schematic of the channel correction on general public wireless interface of the embodiment of the invention 4 confessions.
Embodiment
For the purpose that makes the embodiment of the invention, technical scheme, and advantage clearer, below the embodiment of the invention is elaborated with reference to accompanying drawing.
Referring to Fig. 1, be the logical construction schematic diagram of the method for the channel correction on general public wireless interface of the embodiment of the invention 1.
The principle of the correction of the embodiment of the invention 1 is: will be corrected object designs in the path of a closed loop, and inject the known signal that is corrected the object front and back by contrast, and obtain control information, correction signal is transmitted by the CPRI interface.
Injection is corrected the signal before the object, is defined as the correction signal of excitation;
Injection is corrected the signal behind the object, is defined as the correction signal of collection.
As shown in Figure 1, be corrected,, the inconsistency of different passages on the middle radio-frequency module proofreaied and correct, make the characteristic of different middle radio-frequency channels to be consistent by proofreading and correct design to radio-frequency module (being RE) in liking.Correction module has been shown among Fig. 1, and (CAL is Calibration) as a newly-increased module, with the relation between REC, the RE.Structure shown in Figure 1 is illustrated for logical construction of the present invention, is not the actual physical implementation structure, and in present embodiment 1, the physics realization structure of Fig. 1 can be as mistake! Do not find Reference source.Shown in, correction module (CAL) will be divided into two parts, will be placed on REC and RE side respectively.Excitation correction signal and acquisition correction signal all transmit by the CPRI interface.Dotted line is represented the transmission by the correction signal of CPRI interface among the figure.
With reference to figure 3, be the method flow diagram of the embodiment of the invention 1,
The correction signal that step S301, the side injection at least two middle radio-frequency channels encourage;
The described correction signal of transmitting on the CPRI interface is generally digital signal, and concrete signal form and size can not limit.As mistake! Do not find Reference source.Shown in, the correction of middle radio-frequency channel can have two kinds of design forms usually, and 1, correction module need inject or the acquisition correction signal from the REC side.2, correction module only need inject or the acquisition correction signal from the RE side.No matter adopt the sort of mode, can both realize to be corrected object designs in the path of a closed loop, inject the known signal that is corrected the object front and back by contrast, obtain the purpose of control information, the embodiment of the invention does not limit the place side of concrete excitation correction signal and acquisition correction signal.
Behind the radio-frequency channel, gather the correction signals of described at least two middle radio-frequency channel opposite side outputs, the correction signal of being gathered accordingly during the correction signal process of step S302, described excitation is corresponding;
The correction signal of described excitation and the correction signal of the collection common public radio interface correction signal transmission mechanism by being provided with is transmitted by common public radio interface;
Step S303, the acquired signal and the pumping signal of more described at least two middle radio-frequency channels respectively obtain the consistency difference parameter of described at least two middle radio-frequency channels;
According to described consistency difference parameter, radio-frequency channel in described is compensated.
For example, the correction signal of the excitation of injection radio-frequency channel 1 size is A, and behind the radio-frequency channel 1, the correction signal of the collection that obtains size is A1 in the process; The correction signal size of the excitation of injection radio-frequency channel 2 is B, and behind the radio-frequency channel 2, the correction signal of the collection that obtains size is B2 in the process; So, for middle radio-frequency channel 1, the ratio of the correction signal of the excitation of injection and the correction signal of collection is A/A1; For middle radio-frequency channel 2, the ratio of the correction signal of the excitation of injection and the correction signal of collection is B/B2.Like this,, just can learn the consistency difference condition of two passages,, can compensate radio-frequency channel in corresponding according to difference condition by comparing A/A1 and B/B2.
In order to realize conveniently, general, for different middle radio-frequency channels, the correction signal of the excitation of injecting is identical, for example all is C, through behind the different middle radio-frequency channels, C1 can be obtained, C2, the correction signal that C3 etc. gather respectively, by comparing C/C1, C/C2, sizes such as C/C3, can learn that the radio-frequency channel is to the situation that influences of same signal in the difference, thereby learn the consistency difference condition of radio-frequency channel in the difference, and then, radio-frequency channel in corresponding is compensated according to difference condition.
Those of ordinary skills can know, below only be specific embodiments of the invention, concrete passage number, the correction signal type, the comparative pattern of the correction signal of excitation and the correction signal of collection and the compensating form of follow-up centering radio-frequency channel etc., can be according to the thought of the embodiment of the invention, all have in specific embodiments and applications and can change part.
Need to prove that the correction of middle radio-frequency channel generally is divided into up correction and descending correction.
The process of up correction is, correction module injects identical pumping signal at different antenna ports, after the different passages of radio frequency receive in the process, obtain acquired signal, after the acquired signal and original excitation signal contrast with different passages, just obtained the consistency difference parameter of different passages, according to these parameters, different passages are compensated, just finished the correction of data feedback channel.
The process of descending correction is, correction module is by BB or directly on RE, known pumping signal is injected in radio-frequency channel in the difference, behind the different passages of radio frequency, obtain acquired signal by the correction module unification in the process, after the acquired signal and original excitation signal contrast with different passages at antenna port, just obtained the consistency difference parameter of different passages, according to these parameters, different passages are compensated, just finished the correction of down going channel.
In conjunction with the channel correcting method described in the embodiment of the invention 1, when carrying out channel correcting, need to solve the transmission problem of correction signal, the embodiment of the invention 2 has proposed TDD (Time Division Duplex, time division duplex) under the pattern, carries out the solution of correction signal transmission on the CPRI interface.
With reference to figure 4, under tdd mode, the transfer of data of up-downgoing has sequential relationship shown in Figure 4 on the CPRI interface.Comprise a sub-frame of uplink and a descending sub frame in cycle at a tdd frame, descending sub frame occupies the different moment with sub-frame of uplink.According to the CPRI interface definition, down direction is constantly corresponding at descending sub frame, has data to send on the CPRI interface, and down direction is constantly corresponding at sub-frame of uplink, and the CPRI interface does not have data to send; Equally, up direction is constantly corresponding at sub-frame of uplink, and the CPRI interface just has data to send; Up direction is constantly corresponding at descending sub frame, and the CPRI interface does not have data to send.
With reference to figure 5, in the embodiment of the invention 2, when proofreading and correct data feedback channel,, on down direction, send pumping signal to RE from REC by the CPRI interface in the sub-frame of uplink moment corresponding, by RE pumping signal is injected in the data feedback channel of middle radio frequency.Like this, need the correction signal of collection, in data feedback channel, mix, on up direction, send to REC from RE by the CPRI interface with normal data.
In like manner, when proofreading and correct down going channel, in the descending sub frame moment corresponding, pumping signal and normal data mix, by the CPRI interface on down direction, send to RE from REC, in by RE pumping signal being injected in the down going channel of radio frequency, and collect correction data by down going channel.Like this, the correction signal of collection on up direction, is issued REC from RE by the CPRI interface.
Like this, just finished the transmission of correction data, also just realized the function of channel correcting by the CPRI interface.
The embodiment of the invention 3 provides another kind of method of carrying out the correction signal transmission in CPRI, and can support correction signal to be independent of original other transmission of Information in the CPRI interface.The embodiment of the invention 3 is only applicable to tdd mode, and can be applicable to other communication patterns, as FDD (FrequencyDivision Duplex, Frequency Division Duplexing (FDD)) pattern.
The embodiment of the invention 3 is the independent field of correction signal definition in the frame of CPRI.Block (control word) or IQ data field (IQ data block) definition can controlled, as shown in Figure 6.
If at the control word area definition,, can select certain 1 or several Control word as the correction signal field according to the definition of CPRI standard.The definition of control word is as shown in table 1.Each cell in table 1 circle, definition that can a corresponding control word.
Here need to prove, the cell that not merely is reserved in the following table, vendor specific can define a control word as the correction signal field, for the cell that definition is arranged, if bigger excess room is still arranged, also can continue to utilize, the definition control word is as the field of correction signal.
In the table 1CPRI interface to the definition of control word
If the IQ data go to define independent field, if in the IQ data field, occupy different bit positions respectively with original IQ data, according to the bandwidth of correction signal, occupy 1 or several bit.Correction signal is in the arrangement of IQ data field and the sequential relationship that sends, and is identical with the definition of IQ signal.The IQ data field as shown in Figure 6.
On this basis, correction signal will be transmitted in a plurality of CPRI frames with the form of serial data, (the High-Level Data Link Control of HDLC in transmission form and the CPRI interface, High-Level Data Link Control) passage is similar, promptly from a plurality of CPRI frames, extract correction signal, according to time-series, be combined into complete correction signal, as shown in Figure 7.
For example, determine the IQ data field in the CPRI frame, adopt two bits to be used as the transmission of correction signal.So for receiving terminal, in continuous CPRI frame, the data of this two bits according to time-series, are combined into the data sequence of a serial.To the data sequence of this serial, self-defined according to the user just can solve correction signal again.
Show that as Fig. 8 the embodiment of the invention 4 provides a kind of system of channel correction on general public wireless interface, described system comprises excitation signal generation unit 801, correction signal transmission unit 802, acquired signal unit 803, channel compensation unit 804;
Described excitation signal generation unit produces the correction signal of excitation, and injects a side of at least two radio-frequency channels;
Described acquired signal unit obtains correction signal in the opposite side collection of described at least two middle radio-frequency channels through behind described at least two middle radio-frequency channels;
Described correction signal transmission unit transmits the correction signal of the excitation that described excitation signal generation unit produces and the correction signal that described acquired signal unit is gathered by the transmission mechanism that is provided with;
Described channel compensation unit is the correction signal of the collection of more described at least two middle radio-frequency channels and the correction signal of excitation respectively, obtain the consistency difference parameter of described at least two middle radio-frequency channels, and, radio-frequency channel in described is compensated according to described consistency difference parameter.
The transmission mechanism that is provided with in the described correction signal transmission unit can be specially:
Under tdd mode, in up or descending sub frame, correction signal and normal data mix transmission; In the up or corresponding moment that does not have data to send of down data subframes, transmit correction signal.
In addition, the transmission mechanism that is provided with in the described correction signal transmission unit can also be specially:
Control block or IQ data field definition correction signal field at the CPRI frame; By the correction signal field, with the transmission of correction signal serial in a plurality of continuous CPRI frames.
The embodiment of the invention 5 also provides a kind of common public radio interface, and described common public radio interface comprises the correction signal transmission unit, the transmission mechanism transmission correction signal of described correction signal transmission unit by being provided with.
The transmission mechanism that is provided with in the described correction signal transmission unit is specially:
Under tdd mode, in up or descending sub frame, correction signal and normal data mix transmission; In the up or corresponding moment that does not have data to send of down data subframes, transmit correction signal.
In addition, the transmission mechanism that is provided with in the described correction signal transmission unit can also be specially:
Control block or IQ data field definition correction signal field at the CPRI frame; By the correction signal field, with the transmission of correction signal serial in a plurality of continuous CPRI frames.
The embodiment of the invention 6 also provides a kind of base station equipment, and this base station equipment has comprised the general radio interface module of describing in the foregoing description 5, thereby makes this base station possess by described general radio interface module, carries out the function of channel correcting.
One of ordinary skill in the art will appreciate that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises the steps: when carrying out
Inject the correction signal of excitation at least in a side of two middle radio-frequency channels;
Behind the radio-frequency channel, gather the correction signals of described at least two middle radio-frequency channel opposite side outputs, the correction signal of being gathered accordingly during the correction signal process of described excitation is corresponding;
The correction signal of described excitation and the correction signal of the collection common public radio interface correction signal transmission mechanism by being provided with is transmitted by common public radio interface;
The acquired signal of more described at least two middle radio-frequency channels and pumping signal respectively obtain the consistency difference parameter of described at least two middle radio-frequency channels;
According to described consistency difference parameter, radio-frequency channel in described is compensated.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
More than the method and system of a kind of channel correction on general public wireless interface provided by the present invention is described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the method for a channel correction on general public wireless interface is characterized in that, described method comprises:
Inject the correction signal of excitation at least in a side of two middle radio-frequency channels;
Behind the radio-frequency channel, gather the correction signals of described at least two middle radio-frequency channel opposite side outputs, the correction signal of being gathered accordingly during the correction signal process of described excitation is corresponding;
The correction signal of described excitation and the correction signal of the collection common public radio interface correction signal transmission mechanism by being provided with is transmitted by common public radio interface;
The correction signal of the correction signal of the collection of more described at least two middle radio-frequency channels and excitation respectively, obtain the consistency difference parameter of described at least two middle radio-frequency channels, wherein, the correction signal of described excitation has been passed through described middle radio-frequency channel and the transmission of described common public radio interface, and the correction signal of described collection has been passed through described common public radio interface transmission;
According to described consistency difference parameter, radio-frequency channel in described is compensated.
2. the method described in claim 1, it is characterized in that, the described mechanism of carrying out the correction signal transmission on the common public radio interface that is provided with is specially: under tdd mode, in up or descending sub frame, correction signal and normal data mix transmission; In the up or corresponding moment that does not have data to send of down data subframes, transmission correction signal.
3. the method described in claim 1 is characterized in that, the described mechanism of carrying out the correction signal transmission on the common public radio interface that is provided with is specially: in the control block or the IQ data field definition correction signal field of CPRI frame; By the correction signal field, with the transmission of correction signal serial in a plurality of continuous CPRI frames.
4. as each described method in the claim 1 to 3, it is characterized in that described correction signal is a digital signal.
5. the method described in claim 4 is characterized in that, injects the correction signal of identical excitation in described at least two middle radio-frequency channels.
6. the method described in claim 5 is characterized in that, at the data feedback channel timing, injects the correction signal of excitation at antenna port; At the down going channel timing, inject the correction signal of excitation from baseband portion.
7. the system of a channel correction on general public wireless interface is characterized in that, described system comprises excitation signal generation unit, correction signal transmission unit, acquired signal unit, channel compensation unit;
Described excitation signal generation unit produces the correction signal of excitation, and injects a side of at least two radio-frequency channels;
Described acquired signal unit obtains correction signal in the opposite side collection of described at least two middle radio-frequency channels through behind described at least two middle radio-frequency channels;
Described correction signal transmission unit transmits the correction signal of the excitation that described excitation signal generation unit produces and the correction signal that described acquired signal unit is gathered by the transmission mechanism that is provided with;
Described channel compensation unit is the correction signal of the collection of more described at least two middle radio-frequency channels and the correction signal of excitation respectively, obtain the consistency difference parameter of described at least two middle radio-frequency channels, and according to described consistency difference parameter, radio-frequency channel in described is compensated, wherein, the correction signal of described excitation has been passed through described middle radio-frequency channel and the transmission of described common public radio interface, and the correction signal of described collection has been passed through described common public radio interface transmission.
8. the system described in claim 7 is characterized in that, the transmission mechanism that is provided with in the described correction signal transmission unit is specially:
Under tdd mode, in up or descending sub frame, correction signal and normal data mix transmission; In the up or corresponding moment that does not have data to send of down data subframes, transmit correction signal.
9. the system described in claim 7 is characterized in that, the transmission mechanism that is provided with in the described correction signal transmission unit is specially:
Control block or IQ data field definition correction signal field at the CPRI frame; By the correction signal field, with the transmission of correction signal serial in the CPRI of a plurality of contacts frame.
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