CN102647813A - Wireless communication method and distributed base station system - Google Patents
Wireless communication method and distributed base station system Download PDFInfo
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- CN102647813A CN102647813A CN201210132984XA CN201210132984A CN102647813A CN 102647813 A CN102647813 A CN 102647813A CN 201210132984X A CN201210132984X A CN 201210132984XA CN 201210132984 A CN201210132984 A CN 201210132984A CN 102647813 A CN102647813 A CN 102647813A
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Abstract
An embodiment of the invention discloses a wireless communication method and a distributed base station system, which relates to the field of communication and can realize multi-communication-system support functions of BBUs (baseband units) on the premise of keeping existing networking modes unchanged. A data transmission method based on CPRI (common public radio interface) includes: transmitting the BBU of the second communication system to second control data of at least one radio remote unit (RRU) to convert similar-CPRI type combined data and transmitting the combined data to the BBU of the first communication system through similar-CPRI type channels; restoring the combined data received by the BBU of the first communication system to be second control data, transmitting the second control data and the first control data to at least one RRU through CPRI channels so that at least one RRU supports data uploading and/or downloading of the first communication system and the second communication system.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of wireless communications method and distributed base station system.
Background technology
Present 3G network uses the distributed base station framework in a large number, promptly adopts the wireless extension unit (Radio Remote Unit is called for short RRU) and the baseband processing unit (BaseBand Unit is called for short BBU) that connect through optical fiber, and is as shown in Figure 1.A BBU can support a plurality of RRU, adopts BBU+RRU multichannel scheme, can solve the indoor covering problem of large stadium well.RRU and BBU bear the Radio frequency Processing Unit, RF Processing Unit and the Base-Band Processing part of base station respectively, and independent separately the installation is placed apart, is connected through electrical interface or optical interface, forms the distributed base station form.
The RRU technical characterstic is that the base station is divided into the near-end machine is radio base band control (RadioServer; Be called for short RS) and remote termination (being RRU) two parts; Connect through optical fiber between the two; Its interface is based on open general radio interface (The Common Public RadioInterface is called for short CPRI) interface, can stably be connected with mainstream vendor's equipment.RS can be installed in suitable machine room position, and RRU is installed in antenna end, and a RS can connect several RRU, and like this, the part that just will have base station module now is separated.Through RS is separated with RRU, can loaded down with trivial details maintenance work be simplified to the RS end.
But existing BBU+RRU framework is only supported a kind of communication standard; Can not support multiple communication standard; If use the BBU that supports multi-communication standard; Then need original existing network main control unit be replaced with the main control unit of supporting multi-communication standard, and need the above-mentioned networking model of modify, the cost cost is bigger.
Summary of the invention
Embodiments of the invention technical problem to be solved is to provide a kind of wireless communications method and distributed base station system, can under the prerequisite that does not change existing networking model, realize the multi-communication standard support function of BBU.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A kind of wireless communications method comprises:
The BBU of second communication standard is sent to second control data of at least one RRU; The data splitting of type of converting into CPRI type; And through class CPRI passage said data splitting is sent to the BBU of first communication standard; Wherein, said second control data of each frame comprises IQ part and control word part;
The said data splitting that the BBU of said first communication standard is received; Revert to said second control data; And with said second control data; Need send to first control data of said at least one RRU with the BBU self of said first communication standard, send to said at least one RRU, so that said at least one RRU supports the data uplink of first communication standard and second communication standard and/or descending through the CPRI passage.
A kind of distributed base station system is characterized in that, comprising: the BBU of the BBU of first communication standard, second communication standard and at least one RRU, and the BBU of said first communication standard is connected through optical fiber with said at least one RRU, wherein,
The BBU of second communication standard comprises:
Mapping block is used for the BBU of second communication standard is sent to second control data of at least one wireless extension unit RRU, the data splitting of type of converting into CPRI type;
Second sending module is used for through class CPRI passage said data splitting being sent to the BBU of first communication standard, and wherein, said second control data of each frame comprises IQ part and control word part;
The BBU of first communication standard comprises:
Receiver module is used to receive the said data splitting that the BBU of said second communication standard sends;
Separate mapping block, be used for the said data splitting that receives is reverted to said second control data;
First sending module; Be used for said second control data; Need send to first control data of said at least one RRU with the BBU self of said first communication standard; Send to said at least one RRU through the CPRI passage, so that said at least one RRU supports the data uplink of first communication standard and second communication standard and/or descending.
The wireless communications method of the embodiment of the invention and distributed base station system; The BBU of second communication standard forms data splitting through with in second control data type of the being mapped to CPRI passage, and through class CPRI passage data splitting is redispatched to the BBU of first communication standard; The BBU of first communication standard separates mapping with data splitting again and comes out; Revert to second control data, can under the prerequisite that does not change existing networking model, realize the multi-communication standard support function of BBU; Break through the connection restriction between the BBU groove position of each communication standard, reduced networking cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the sketch map of BBU+RRU framework in the prior art.
Fig. 2 is based on the schematic flow sheet of the data transmission method of CPRI in the embodiment of the invention;
Fig. 3 is the communication scheme of BBU and RRU in the embodiment of the invention;
Fig. 4 is the sketch map of Frame in type CPRI agreement in the embodiment of the invention;
Fig. 5 be in the embodiment of the invention data map in the CPRI passage to the sketch map of type CPRI passage;
Fig. 6 is the sketch map of type CPRI passage in the embodiment of the invention;
Fig. 7 separates one of sketch map of mapping for the data in the embodiment of the invention type of CPRI passage;
Fig. 8 separate for the data in the embodiment of the invention type of CPRI passage mapping sketch map two;
This is one of distributed base station system sketch map in the inventive embodiments for Fig. 9;
Figure 10 be in the embodiment of the invention distributed base station system sketch map two.
Embodiment
The embodiment of the invention provides a kind of data transmission method based on CPRI, baseband processing unit and communication system, can under the prerequisite that does not change existing networking model, realize the multi-communication standard support function of BBU.
Below in conjunction with accompanying drawing the embodiment of the invention is done detailed description.In below describing,, understand the present invention so that cut thoroughly in order to explain rather than, to have proposed the detail such as particular system structure, interface, technology in order to limit.Yet, not it will be clear to one skilled in the art that in having other embodiment of these details and can realize the present invention yet.In other situation, omit detailed description, in order to avoid unnecessary details hinders description of the invention to well-known device, circuit and method.
The various technology of describing among this paper can be used for various wireless communication systems, for example current 2G, 3G communication system and next generation communication system; Global system for mobile communications (Global Systemfor Mobile communications, be called for short GSM) for example, code division multiple access (Code DivisionMultiple Access; Be called for short CDMA) system, time division multiple access (Time Division MultipleAccess is called for short TDMA) system; WCDMA (Wideband Code DivisionMultiple Access Wireless is called for short WCDMA), frequency division multiple access (Frequency DivisionMultiple Addressing; Be called for short FDMA) system, OFDM (OrthogonalFrequency-Division Multiple Access is called for short OFDMA) system; Single Carrier Frequency Division Multiple Access (SC-FDMA) system; GPRS (General Packet Radio Service is called for short GPRS) system, Long Term Evolution (Long Term Evolution; Be called for short LTE) system, and other these type of communication systems.
Term among this paper " system " and " network " are in this article often by interchangeable use.Term among this paper " and/or ", only be a kind of incidence relation of describing affiliated partner, can there be three kinds of relations in expression, for example, and A and/or B, can represent: individualism A exists A and B, these three kinds of situation of individualism B simultaneously.In addition, character "/" among this paper, generally represent forward-backward correlation to as if a kind of " or " relation.
The method of present embodiment is based on the general radio interface data transmission method of (The Common Public RadioInterface is called for short CPRI).At present, CPRI has been widely used in the wireless communication system, and CPRI adopts digital mode to come transmission base band, and its digital interface has two kinds: standard C PRI interface and OBSAI interface.CPRI has defined base station data processing and control element (PCE) (Radio Equipment Control; Be called for short REC) and base station transceiver unit (RadioEquipment; Abbreviation RE) interface relationship between, its data structure can directly be used for the far-end transmission, become a kind of far-drawing system of base station.
Existing networking model is: baseband processing unit (Base Band Unit is separately passed through in the master control of each communication standard respectively; Be called for short BBU) communicate with the base station; The method of present embodiment connects the BBU of each communication standard under the prerequisite of original networking model through type CPRI.Yet also there is a difficult problem in said method, owing to have only 1-3 interconnecting channels between two BBU, and base station of the every butt joint of BBU; For example, RRU just need take a butt joint passage between two communication standards; Obviously, generally speaking, RRU quantity is much larger than 3; Therefore, how to break through above-mentioned groove position and connect restriction, become the problem that the following method of the present invention wants emphasis to solve.
Present embodiment provides a kind of wireless communications method, and is as shown in Figure 2, and this method comprises:
The BBU of first communication standard can pass through direct and each wireless extension unit (the Radio Remote Unit of CPRI passage; Be called for short RRU) communicate; But when the BBU of second communication standard and each RRU communicate, then must be through the BBU of " terminal "-first communication standard.The BBU of first communication standard is connected through a type CPRI with the BBU of second communication standard, and uses a kind CPRI agreement.Class CPRI agreement is meant that those skilled in the art are according to actual needs improved agreement on CPRI agreement basis.Wherein, First communication standard and second communication standard can be global system for mobile communications (Global System for Mobilecommunications; Abbreviation GSM), UMTS (Universal MobileTelecommunications System; Abbreviation UMTS), synchronous code division multiple access system (Time Division-Synchronous Code Division Multiple Access of time-division; Be called for short TDS-CDMA), CDMA 2000 system (Code Division Multiple Access 2000 is called for short CDMA2000) and LTE system etc., but be not limited thereto.
Need to prove; The BBU of present embodiment and RRU all continue to use BBU and the RRU under the existing networking model; Except the BBU of second communication standard and the BBU of first communication standard are connected this part, other functions all are existing BBU and the existing function of RRU, repeat no more at this.
As shown in Figure 3; The BBU of second control data to second communication standard is sent in the master control of second communication standard; Because the BBU of first communication standard is connected through a type CPRI with the BBU of second communication standard; Therefore at first need be with the data splitting of second control data type of converting into the CPRI type, so that the BBU of first communication standard can receive this data splitting.Exemplary, the number of RRU is 6, the number of the class CPRI passage between the BBU of the BBU of first communication standard and second communication standard is 3.The RRU of first communication standard receives second control data from the master control of second communication standard; Wherein, second control data is unit with the frame, and each frame first data comprises IQ part and control word part; As shown in Figure 4; Every frame data are divided into 16 row, the control word information of type of the being CPRI of the grey color part of first row, the IQ part of 2～16 type of classifying as CPRI.The information of type of the being CPRI passage chain of command that partly carries of control word wherein, what IQ partly carried is the business datum of communication standard.
The BBU of second communication standard need be through control word and the IQ data of three interconnected type of CPRI passages to 6 CPRI passages of the BBU of first communication standard transmission.Because under different speed; CPRI is inconsistent with type data volume of the every row of CPRI, and for example, every columns is according to 128bit is arranged in the time of the 9.8304G wire rate; 3.072G every columns is according to 40bit is arranged in the time of wire rate; Therefore, the BBU of second communication standard need be through control word part and IQ partial data the being mapped to type CPRI of special mode with the CPRI passage after receiving second control data.
Before beginning mapping, several configuration parameters below also need defining:
1, because in the communication process of present embodiment; The IQ data of first communication standard and the IQ data of second communication standard need be closed on the CPRI passage of road to and sent to RRU; Therefore the IQ data of second communication standard are not need all on type of the being mapped to CPRI passage, so that slot milling is given the BBU of first communication standard.Therefore, need the IQ partial data of regulation second communication standard to begin mapping, the map source address that promptly disposes the CPRI passage wherefrom;
2, because 3 class CPRI passages are arranged, so need initial type of the specified data mapping CPRI number, initial type of CPRI row of mapping number and the mapping length on class CPRI passage.
After accomplishing above-mentioned work; As shown in Figure 5; The BBU of second communication standard extracts the valid data and the control word part of first data I Q part according to the configuration parameter that configures, and valid data that extract and control word partly are arranged in order to the second middle buffer memory.In addition, above-mentioned configuration parameter is to be provided with by the master control of second communication standard.
Next, as shown in Figure 5, the BBU of second communication standard extracts the data in the buffer memory in the middle of second according to the wire rate of class CPRI passage, and the data in the buffer memory in the middle of second are filled to the IQ part of the data of three class CPRI passages, forms data splitting.It is thus clear that the IQ of data splitting part not only comprised second control data the control word part, but also comprised the IQ partial data of second control data.So far, the control word part of second control data and the work of IQ partial data type of being mapped to CPRI are accomplished.
Fig. 6 is the data of first communication standard and 3 butt joints type CPRI passage between the second communication standard; The control word part of the part representation class CPRI passage of high order end grey; The control word and the IQ data message of 6 CPRI passages that the IQ part field of remaining representation class CPRI is carried, the control word of wherein any CPRI passage and IQ data all are closely to be arranged in together.
After mapping was accomplished, the BBU of second communication standard was sent to data splitting through class CPRI passage the BBU of first communication standard.
Behind the said data splitting that the BBU of first communication standard receives, at first it is reverted to second control data.
Exemplary, like Fig. 7 and shown in Figure 8, the process that the BBU of first communication standard separates mapping comprises:
The BBU of first communication standard extracts the IQ partial data of said data splitting, and said IQ partly is arranged in order to the first middle buffer memory;
Data in the middle of the BBU of first communication standard extracts according to the wire rate of CPRI passage in the buffer memory, and the data in will the said first centre buffer memory are filled to the IQ part of the data of CPRI passage, form second control data.
In separating the process of mapping, the parameter that defines in the above-mentioned mapping process is still effective, therefore, separates after mapping accomplishes, can be according to the parameter of configuration data in type of the reduction CPRI passage fully, and as shown in Figure 8.
After recovering to obtain second control data; The BBU of first communication standard is with said second control data; Need send to first control data of said at least one RRU with the BBU self of said first communication standard; Send to said at least one RRU through the CPRI passage, so that said at least one RRU supports the data uplink of first communication standard and second communication standard and/or descending.First control data is the BBU's that sends to first communication standard of the master control by first communication standard, and at this moment, the IQ data of first communication standard and the IQ data of second communication standard are closed on the CPRI passage of road to and sent to RRU.
Need to prove; The foregoing description is that example describes with two communication standards; Also applicable to communicating by letter between three and three above communication standards and the RRU, its principle is same as the previously described embodiments, all within protection scope of the present invention for method of the present invention.The communication standard that the present invention is suitable for has GSM, UMTS, TDS-CDMA, CDMA2000, LTE etc.
The wireless communications method of present embodiment; The BBU of second communication standard is through with in second control data type of the being mapped to CPRI passage; Form data splitting, and through class CPRI passage data splitting is redispatched to the BBU of first communication standard, the BBU of first communication standard separates mapping with data splitting again and comes out; Revert to second control data; Can be under the prerequisite that does not change existing networking model, realize the multi-communication standard support function of BBU, broken through the connection restriction between the BBU groove position of each communication standard.
Embodiment is corresponding with said method; Present embodiment also provides a kind of distributed base station system; As shown in Figure 9, comprising: the BBU 1 of first communication standard, the BBU2 of second communication standard and at least one RRU 3, the BBU 1 of said first communication standard is connected through optical fiber with said at least one RRU3; Wherein
The BBU 2 of second communication standard comprises:
Second sending module 22 is used for through class CPRI passage said data splitting being sent to the BBU 1 of first communication standard, and wherein, said second control data of each frame comprises IQ part and control word part;
The BBU 1 of first communication standard comprises:
First sending module 13; Be used for said second control data; Need send to first control data of said at least one RRU with the BBU self of said first communication standard; Send to said at least one RRU through the CPRI passage, so that said at least one RRU supports the data uplink of first communication standard and second communication standard and/or descending.
Further, said mapping block 21 specifically is used for:
Extract the valid data and the control word part of the IQ part of said second control data, and said valid data and control word partly are arranged in order to the second middle buffer memory, and,
Extract the data in the buffer memory in the middle of said second according to the wire rate of class CPRI passage, and the data in the buffer memory are filled to the IQ part of the data of said class CPRI passage in the middle of will said second, form the second Combination Control data.
Further, the said mapping block 12 of separating specifically is used for:
Extract the IQ partial data of the said second Combination Control data, and said second data after will extracting are arranged in order in the middle of first in the buffer memory, and,
Extract the data in the buffer memory in the middle of said first according to the wire rate of CPRI passage, and in the middle of will said first the data in the buffer memory be filled to said CPRI passage data IQ partly and the control word part, form second control data.
Shown in figure 10; Further; Distributed base station system also comprises: the master control 4 of first communication standard and the master control 5 of second communication standard; The master control 4 that said first control data is said first communication standard sends to the BBU of first communication standard, and master control 5 that said second control data is said second communication standard sends to the BBU of second communication standard.
Further, said mapping block 21 is used for:
The BBU of second communication standard is sent to second control data of at least one wireless extension unit RRU according to configuration parameter; The data splitting of type of converting into CPRI type, said configuration parameter comprises: the map source address of CPRI passage, the data map of CPRI passage initial type CPRI number, initial type of CPRI row of mapping number and the mapping length on class CPRI passage.
The those skilled in the art can be well understood to; For the convenience described with succinct; Only the division with above-mentioned each functional module is illustrated, and in the practical application, can as required the above-mentioned functions distribution be accomplished by different functional; The internal structure that is about to device is divided into different functional, to accomplish all or part of function of above description.The system of foregoing description, the concrete course of work of device and unit can repeat no more at this with reference to the corresponding process among the preceding method embodiment.
In several embodiment that the application provided, should be understood that, the system that is disclosed, apparatus and method can realize through other mode.For example, device embodiment described above only is schematically, for example; The division of said module or unit; Only be that a kind of logic function is divided, during actual the realization other dividing mode can be arranged, for example a plurality of unit or assembly can combine or can be integrated into another system; Or some characteristics can ignore, or do not carry out.Another point, the coupling each other that shows or discuss or directly coupling or communication to connect can be through some interfaces, the INDIRECT COUPLING of device or unit or communication connect, and can be electrically, machinery or other form.
Said unit as separating component explanation can or can not be physically to separate also, and the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of present embodiment scheme according to the needs selection some or all of unit wherein of reality.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing unit, also can be that the independent physics in each unit exists, and also can be integrated in the unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, also can adopt the form of SFU software functional unit to realize.
If said integrated unit is realized with the form of SFU software functional unit and during as independently production marketing or use, can be stored in the computer read/write memory medium.Based on such understanding; Part or all or part of of this technical scheme that technical scheme of the present invention contributes to prior art in essence in other words can come out with the embodied of software product; This computer software product is stored in the storage medium; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) or processor (processor) carry out all or part of step of the said method of each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random AccessMemory), magnetic disc or CD.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of said claim.
Claims (10)
1. a wireless communications method is characterized in that, comprising:
The baseband processing unit (BBU) of second communication standard is sent to second control data of at least one wireless extension unit (RRU); The data splitting of type of converting into CPRI type; And through class CPRI passage said data splitting is sent to the BBU of first communication standard; Wherein, said second control data of each frame comprises IQ part and control word part;
The said data splitting that the BBU of said first communication standard is received; Revert to said second control data; And with said second control data; Need send to first control data of said at least one RRU with the BBU self of said first communication standard, send to said at least one RRU, so that said at least one RRU supports the data uplink of first communication standard and second communication standard and/or descending through the CPRI passage.
2. wireless communications method according to claim 1 is characterized in that, said BBU with the second communication standard sends to second control data of at least one wireless extension unit RRU, and the data splitting of type of converting into CPRI type comprises:
Extract the valid data and the control word part of the IQ part of said second control data, and said valid data and control word partly are arranged in order to the second middle buffer memory;
Extract the data in the buffer memory in the middle of said second according to the wire rate of class CPRI passage, and the data in the buffer memory are filled to the IQ part of the data of said class CPRI passage in the middle of will said second, form said data splitting.
3. wireless communications method according to claim 1 is characterized in that, the said said data splitting that the BBU of said first communication standard is received reverts to said second control data, comprising:
Extract the IQ partial data of said data splitting, and said second data after will extracting are arranged in order to the first middle buffer memory;
Extract the data in the buffer memory in the middle of said first according to the wire rate of CPRI passage, and in the middle of will said first the data in the buffer memory be filled to said CPRI passage data IQ partly and the control word part, form said second control data.
4. wireless communications method according to claim 1 is characterized in that, master control that said second control data is the second communication standard sends to the BBU of second communication standard.
5. wireless communications method according to claim 1 is characterized in that, said BBU with the second communication standard sends to second control data of at least one wireless extension unit RRU, and the data splitting of type of converting into CPRI type is specially:
The BBU of second communication standard is sent to second control data of at least one wireless extension unit RRU according to configuration parameter; The data splitting of type of converting into CPRI type, said configuration parameter comprises: the map source address of CPRI passage, the data map of CPRI passage initial type CPRI number, initial type of CPRI row of mapping number and the mapping length on class CPRI passage.
6. a distributed base station system is characterized in that, comprising: the BBU of the BBU of first communication standard, second communication standard and at least one RRU, and the BBU of said first communication standard is connected through optical fiber with said at least one RRU, wherein,
The BBU of second communication standard comprises:
Mapping block is used for the BBU of second communication standard is sent to second control data of at least one wireless extension unit RRU, the data splitting of type of converting into CPRI type, and wherein, said second control data of each frame comprises IQ part and control word part;
Second sending module is used for through class CPRI passage said data splitting being sent to the BBU of first communication standard;
The BBU of first communication standard comprises:
Receiver module is used to receive the said data splitting that the BBU of said second communication standard sends;
Separate mapping block, be used for the said data splitting that receives is reverted to said second control data;
First sending module; Be used for said second control data; Need send to first control data of said at least one RRU with the BBU self of said first communication standard; Send to said at least one RRU through the CPRI passage, so that said at least one RRU supports the data uplink of first communication standard and second communication standard and/or descending.
7. distributed base station system according to claim 6 is characterized in that, said mapping block specifically is used for:
Extract the valid data and the control word part of the IQ part of said second control data, and said valid data and control word partly are arranged in order to the second middle buffer memory, and,
Extract the data in the buffer memory in the middle of said second according to the wire rate of class CPRI passage, and the data in the buffer memory are filled to the IQ part of the data of said class CPRI passage in the middle of will said second, form the second Combination Control data.
8. distributed base station system according to claim 6 is characterized in that,
The said mapping block of separating specifically is used for:
Extract the IQ partial data of the said second Combination Control data, and said second data after will extracting are arranged in order in the middle of first in the buffer memory, and,
Extract the data in the buffer memory in the middle of said first according to the wire rate of CPRI passage, and in the middle of will said first the data in the buffer memory be filled to said CPRI passage data IQ partly and the control word part, form second control data.
9. distributed base station system according to claim 6; It is characterized in that; Also comprise: the master control of the master control of first communication standard and second communication standard; The master control that said first control data is said first communication standard sends to the BBU of first communication standard, and master control that said second control data is said second communication standard sends to the BBU of second communication standard.
10. distributed base station system according to claim 6 is characterized in that, said mapping block is used for:
The BBU of second communication standard is sent to second control data of at least one wireless extension unit RRU according to configuration parameter; The data splitting of type of converting into CPRI type, said configuration parameter comprises: the map source address of CPRI passage, the data map of CPRI passage initial type CPRI number, initial type of CPRI row of mapping number and the mapping length on class CPRI passage.
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