CN101938782B - Common public radio interface standard-based CDMA2000 data encapsulation method - Google Patents
Common public radio interface standard-based CDMA2000 data encapsulation method Download PDFInfo
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- CN101938782B CN101938782B CN 201010278477 CN201010278477A CN101938782B CN 101938782 B CN101938782 B CN 101938782B CN 201010278477 CN201010278477 CN 201010278477 CN 201010278477 A CN201010278477 A CN 201010278477A CN 101938782 B CN101938782 B CN 101938782B
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Abstract
The invention discloses a common public radio interface standard-based CDMA2000 data encapsulation method. The method comprises baseband data encapsulation, gain factor encapsulation and a frame encapsulation method which is specified by the common public radio interface standard. Through the technical scheme provided by the invention, a baseband data flow between the baseband and radio frequency of a CDMA2000 system can realize effective encapsulation and stable transmission on the WCDMA standard-based common public radio interface standard; and compared with the conventional method, the method has high periodicity and lays a foundation for the baseband to efficiently process data.
Description
Technical field
The present invention relates to the method for packing of base band and rf data in a kind of CDMA2000 (digital cdma wireless technology system) distributed base station system, in particular for the application process of common public radio interface standard-CPRI agreement in the CDMA2000 system, specifically a kind of CDMA2000 data encapsulation method based on the common public radio interface standard.
Background technology
Common public radio interface (Common Public Radio Interface, CPRI) be by comprising that Ericsson, Huawei, NEC, Nortel Networks and Siemens 5 large groups make a concerted effort to formulate, its objective is and formulate wireless base station (the Radio Equipment Control of internal wireless equipment control centre, REC) standard agreement of interface and between wireless device (Radio Equipment, RE).Open common public radio interface standard is that third generation wireless base station product and second generation wireless digital repeater station are increasing benefit, improves the flexibility aspect and provides convenience.
Common public radio interface has defined physical layer and link layer two layer protocols, can realize digital baseband signal transmission time division multiplexing.Physical layer is supported optical fiber and copper cable, and the line bit rate scope is that 614.4Mb/s is to 6.144Gb/s.Link layer has defined a synchronous frame structure, comprises basic frame and superframe, and the frame frequency of each basic frame is 3.84MHz, comprises 16 words (word).Superframe is to be made of 256 basic frames.Define simultaneously quick control and management passage (Ethernet) and control and management passage (High-Level Data Link Control) at a slow speed, be used for the data of transfer control class and administrative class, can complete base band to the maintenance of radio frequency part.
The common public radio interface standard is the interface standard between present most widely used base band and radio frequency, in these standard criterion 2.0 versions, this standard is based on universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS) be described, and in 3.0 versions, this standard has been added the application of global microwave access intercommunication technological system (World Interoperability for Microwave Access, WiMax).And for the application of common public radio interface standard in digital cdma wireless technology system (Code Divison Multiple Access is called for short " CDMA "), up to the present this tissue is not realized.
In US Patent No. 7,602, mention in 751B2 " METHOD AND APPARATUS FOR TRANSPORTING CDMA TRAFFIC OVER A UMTS-COMPATIBLE CPRI INTERFACE " a kind of on common public radio interface the method for transmission of CDMA data flow, namely transmit on common public radio interface for the data of CDMA at a slow speed of adjusting 1.2288Msps, propose the idea of 8 CDMA chips of 25 basic frame carryings of common public radio interface, specific implementation as shown in Figure 2.
Although shown in accompanying drawing 2, encapsulation has solved the rate-matched problem of 3.84/1.2288, has brought other complicated application problems.At first, the difference that the antenna carrier data of putting on each basic frame fixed position are not quite similar and can cause the rear end baseband interface to process causes the versatility of application to reduce.Secondly, a plurality of antenna carrier gain factor encapsulation will be rethought, cause the complexity of application to improve.
Summary of the invention
The objective of the invention is the problem used for the common public radio interface standard in digital cdma wireless technology system, a kind of CDMA2000 data encapsulation method based on the common public radio interface standard is proposed, the method possesses versatility preferably, lower complexity possesses real-time and the reliability of common public radio interface standard simultaneously.。
Technical scheme of the present invention is:
A kind of CDMA2000 data encapsulation method based on the common public radio interface standard, it comprises base band data encapsulation and gain factor encapsulation;
Base band data encapsulation: according to the chip period proportionate relationship of the basic frame period in the common public radio interface standard and CDMA2000 system 8: 25, determine to encapsulate in the basic frame in 25 common public radio interface standards the chip of 8 CDMA2000 systems; The chip of described 8 CDMA2000 systems is concentrated front 8 the basic frame units that are encapsulated in 25 basic frames of common public radio interface standard;
The gain factor encapsulation: the gain factor data bit is distributed in the chip of CDMA2000 system, occupy the base band data lowest order, set corresponding 24 gain factors of every 256/512/1024/2048 CDMA2000 antenna carrier sampling, this gain factor is contained in front 12 antenna carrier sampling, during sampling:
Be 1 for the over-sampling coefficient, namely this gain factor is in front 12 antenna carrier;
Be 2 for the over-sampling coefficient, namely this gain factor is in front 6 antenna carrier;
Be 4 for the over-sampling coefficient, namely this gain factor is in front 3 antenna carrier.
In base band data encapsulation of the present invention, minute two parts in 25 basic frames, front 8 basic frames are valid data, rear 17 basic frames are empty.
The position of gain factor encapsulation of the present invention is that 6400 basic frames are as the cycle repetition take 25 superframes.
During gain factor encapsulation of the present invention, last bit information of continuous 24 groups of data abandons, and inserts respectively 24 bit informations of gain factor, and all the other last bits of respectively organizing data all normally carry raw information.
Be equipped with a plurality of antenna carrier in each chip of the present invention, be set in front 8 chips of every 25 chips and be packaged with antenna carrier, rear 17 chips are empty.
Beneficial effect of the present invention:
Method of the present invention compared with prior art has stronger practicality and versatility, facilitates Base-Band Processing.At first, minute two parts in 25 basic frames, front 8 basic frames are valid data, rear 17 basic frames are empty, compare with the comparatively complicated mode that distributes of 25 basic frame data in the United States Patent (USP) of mentioning in background technology, regular and periodicity all greatly improves, and the high efficiency of processing for Back end data improves the basis; Although this packaged type need to encapsulate after receiving 8 CDMA2000 chips again, this time-delay can be revised at the later stage algorithm.Secondly, gain factor is encapsulated in the common public radio interface standard with data mode, and Back end data need not gain factor is processed separately, only need extract when needed to get final product, and greatly reduces the complexity that Back end data is processed; And for the reasonable package gain factor, last bit information of continuous 24 groups of data abandons, insert respectively 24 bit informations of gain factor, all the other last bits of respectively organizing data normally carry raw information, can bring at most the performance loss of 24/ (8*2*256)=0.0058, the snr loss is 0.035dB, is a very little value, almost can ignore.
The method of common public radio interface standard carrying CDMA2000 data of the present invention, this method for packing comprises base band data and gain factor method for packing, and the framing method for packing of pressing the common public radio interface standard code.By technical scheme provided by the invention, the base band of CDMA2000 system and the base-band data stream between radio frequency can effectively encapsulate stable transfer on based on the common public radio interface standard of WCDMA standard, relatively, method possesses good periodicity, and lays the first stone for the efficient deal with data of base band.
Description of drawings
Fig. 1 is the frame structure block diagram of common public radio interface standard, wherein: W is the font size in basic frame, Y is the byte number in word, and X is basic frame number, and 1 basic frame length is 260.42ns, Z is Hyper Frame Number, 1 superframe comprises 256 basic frames, and frame length is 6637 μ s, and BFN is CPRI 10ms frame, 1 BFN comprises 150 superframes, and frame length is 10ms;
Fig. 2 is US Patent No. 7,602, the encapsulation block diagram of CDMA data in the common public radio interface standard that 751B2 proposes;
Fig. 3 is the encapsulation block diagram of CDMA2000 base band data in the common public radio interface standard that the present invention proposes;
Fig. 4 is the position view of gain factor in the CDMA2000 base band data that the present invention proposes;
Fig. 5 is the position view of gain factor in the common public radio interface standard that the present invention proposes.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Fig. 3-5, a kind of CDMA2000 data encapsulation method based on the common public radio interface standard is characterized in that it comprises base band data encapsulation and gain factor encapsulation;
Base band data encapsulation: according to the chip period proportionate relationship of the basic frame period in the common public radio interface standard and CDMA2000 system 8: 25, determine to encapsulate in the basic frame in 25 common public radio interface standards the chip of 8 CDMA2000 systems; The chip of described 8 CDMA2000 systems is concentrated front 8 the basic frame units that are encapsulated in 25 basic frames of common public radio interface standard;
The gain factor encapsulation: the gain factor data bit is distributed in the chip of CDMA2000 system, occupy the base band data lowest order, set corresponding 24 gain factors of every 256/512/1024/2048 CDMA2000 antenna carrier sampling, this gain factor is contained in front 12 antenna carrier sampling, be equipped with a plurality of antenna carrier in each chip, be set in front 8 chips of every 25 chips and be packaged with antenna carrier, rear 17 chips are empty.During sampling:
Be 1 for the over-sampling coefficient, namely this gain factor is in front 12 antenna carrier;
Be 2 for the over-sampling coefficient, namely this gain factor is in front 6 antenna carrier;
Be 4 for the over-sampling coefficient, namely this gain factor is in front 3 antenna carrier.
In base band data encapsulation of the present invention, minute two parts in 25 basic frames, front 8 basic frames are valid data, rear 17 basic frames are empty.
The position of gain factor encapsulation of the present invention is that 6400 basic frames are as the cycle repetition take 25 superframes.
During gain factor encapsulation of the present invention, last bit information of continuous 24 groups of data abandons, and inserts respectively 24 bit informations of gain factor, and all the other last bits of respectively organizing data all normally carry raw information.
During concrete enforcement:
Common public radio interface standard link encapsulation CDMA2000 data method of the present invention as shown in Figure 3, it encapsulates 8 CDMA2000 chips in 25 basic frames of common public radio interface standard, with 6 antenna carrier, over-sampling is 2, and the gain factor statistical window is that 256 chips are example:
Over-sampling is 1 o'clock, and in a CDMA2000 chip, each antenna carrier hits is 1; Over-sampling is 2 o'clock, and in a CDMA2000 chip, each antenna carrier hits is 2; Over-sampling is 4 o'clock, and in a CDMA2000 chip, each antenna carrier hits is 4.Only have this four kinds of over-samplings possibilities, wherein, downlink data may be only 1 or 2, and upstream data may be only 2 or 4, and we are upstream data here, and over-sampling is taken as 2.From base station frame (BFN) head of common public radio interface standard, every 25 basic frames repeat once.In these 25 basic frames, front 8 basic frame data character segments are used for carrying the antenna carrier data, and in these 8 basic frames, the data arrangement rule is identical, and rear 17 basic frame data character segments are empty namely complete zero; 25 basic frame control words common public radio interface standard of partly coincideing is not done change.
With the position of data bit in the common public radio interface standard superframe of gain factor as shown in Figure 4, begin note from base station frame (BFN) head of common public radio interface standard, every 25 superframe superframes repeat once.
Wherein, the gain factor of corresponding 1 24 bit of 256 CDMA2000 chips is 2 base band data for over-sampling, need to give up front 6 chips of these 256 chips, be also the real part of 12 sampled datas and each that the imaginary part lowest order inserts gain factor, as shown in Figure 5.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (4)
1. the CDMA2000 data encapsulation method based on the common public radio interface standard, is characterized in that it comprises base band data encapsulation and gain factor encapsulation;
Base band data encapsulation: according to the chip period proportionate relationship of the basic frame period in the common public radio interface standard and CDMA2000 system 8: 25, determine to encapsulate in the basic frame in 25 common public radio interface standards the chip of 8 CDMA2000 systems; The chip of described 8 CDMA2000 systems is concentrated front 8 the basic frame units that are encapsulated in 25 basic frames of common public radio interface standard;
The gain factor encapsulation: the gain factor data bit is distributed in the chip of CDMA2000 system, occupy the base band data lowest order, set corresponding 24 gain factors of every 256/512/1024/2048 CDMA2000 antenna carrier sampling, this gain factor is contained in front 12 antenna carrier sampling, during sampling:
Be 1 for the over-sampling coefficient, namely this gain factor is in front 12 antenna carrier;
Be 2 for the over-sampling coefficient, namely this gain factor is in front 6 antenna carrier;
Be 4 for the over-sampling coefficient, namely this gain factor is in front 3 antenna carrier.
2. the CDMA2000 data encapsulation method based on the common public radio interface standard according to claim 1, is characterized in that in described base band data encapsulation, minute two parts in 25 basic frames, and front 8 basic frames are valid data, rear 17 basic frames are empty.
3. the CDMA2000 data encapsulation method based on the common public radio interface standard according to claim 1, is characterized in that the position of described gain factor encapsulation is that 6400 basic frames are as the cycle repetition take 25 superframes.
4. the CDMA2000 data encapsulation method based on the common public radio interface standard according to claim 1, when it is characterized in that described gain factor encapsulation, last bit information of continuous 24 groups of data abandons, insert respectively 24 bit informations of gain factor, all the other last bits of respectively organizing data all normally carry raw information.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101394197A (en) * | 2008-09-28 | 2009-03-25 | 中兴通讯股份有限公司 | Baseband data transmission method and device for CDMA distributed base station system |
| CN101466172A (en) * | 2008-12-25 | 2009-06-24 | 中兴通讯股份有限公司 | Method and device for implementing compatibility of WCDMA system and GSM system |
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| SE0302596D0 (en) * | 2003-09-30 | 2003-09-30 | Ericsson Telefon Ab L M | Improvements in or relating to base stations |
| US7602751B2 (en) * | 2005-12-12 | 2009-10-13 | Motorola, Inc. | Method and apparatus for transporting CDMA traffic over a UMTS-compatible CPRI interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101394197A (en) * | 2008-09-28 | 2009-03-25 | 中兴通讯股份有限公司 | Baseband data transmission method and device for CDMA distributed base station system |
| CN101466172A (en) * | 2008-12-25 | 2009-06-24 | 中兴通讯股份有限公司 | Method and device for implementing compatibility of WCDMA system and GSM system |
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