CN101707499A - Data transmission method and system for realizing compatibility of CDMA and WCDMA - Google Patents

Data transmission method and system for realizing compatibility of CDMA and WCDMA Download PDF

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Publication number
CN101707499A
CN101707499A CN200910235905A CN200910235905A CN101707499A CN 101707499 A CN101707499 A CN 101707499A CN 200910235905 A CN200910235905 A CN 200910235905A CN 200910235905 A CN200910235905 A CN 200910235905A CN 101707499 A CN101707499 A CN 101707499A
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cdma
axc
cpri
data
wcdma
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CN200910235905A
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CN101707499B (en
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李继洲
邓志行
张攀科
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ZTE Corp
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ZTE Corp
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Priority to CN200910235905.6A priority Critical patent/CN101707499B/en
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Priority to PCT/CN2010/073979 priority patent/WO2010145540A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation

Abstract

The invention discloses a data transmission method for realizing the compatibility of WCDMA and CDMA, which comprises the following steps: mapping the service data of a CDMA system and/or a WCDMA system to a CPRI basic frame by a transmitting end and distributing the service data into the CPRI basic frame according to the configuration of the system; transmitting the CPRI basic frame and system configuration information to a receiving end by the transmitting end, carrying out frame resolving and data interleaving resolving on the received CPRI basic frame by the receiving end, carrying out multiplexing resolving according to the system configuration information, carrying out mapping resolving on the data after multiplexing resolving, and recovering a data format required by the corresponding system. The invention also discloses a data transmission system for realizing the compatibility of the WCDMA and the CDMA correspondingly. The invention can realize the transmission of CDMA single-mode service data, WCDMA single-mode service data or WCDMA/CDMA two-systematic service data on the same physical connection, which can save equipment resources and is beneficial to the smooth switching of different modes.

Description

Realize the data transmission method and the system of CDMA and WCDMA compatibility
Technical field
The present invention relates to the data transmission technology in the mobile communication, relate in particular to a kind of data transmission method and system that realizes that code division multiple access (CDMA) is compatible with Wideband Code Division Multiple Access (WCDMA) (WCDMA).
Background technology
In recent years, the development of the framework of communication system formed such trend gradually: radio frequency unit and baseband processing unit are peeled off, and by long-distance transmissions means (as optical fiber) both are connected, then radio frequency unit is placed on the place of various needs.This framework has improved the flexibility of networking on the one hand, has reduced the maintenance cost of network on the other hand.Therefore, this framework more and more obtains user's approval, and the application scenario is also more and more.2003, this framework has been carried as the part of CPRI (Common Public RadioInterface) interface standard, and radio frequency unit is defined as wireless device (Radio Equipment, RE), simultaneously baseband processing unit is defined as radio equipment controller (RadioEquipment Controller, REC).
Its interface rate of CPRI protocol definition is 1.2288Gbps; 2.4576Gbps etc. two-forty; its basic frame rate is 3.84M; and WCDMA data chips speed is 3.84M; the speed that is given for the transmission data in the standard of CDMA is 1.2288M; therefore; how to accomplish the pattern of two kinds of different systems different pieces of information speed in the general-purpose system and be mapped in the basic frame of CPRI; finish the unification of two kinds of standard data L2 layer in CPRI; and then finish in same L1 layer physical channel compatibility and transmit simultaneously, become the difficult point of WCDMA system and cdma system dual-mode base station design.
The compatibility method of existing WCDMA system and cdma system is to switch in two cover codes, can not unify at bottom, the compatibility that promptly can not really be called WCDMA system and cdma system, so, prior art need realize the interconnection and interflow of REC and RE by different optical fiber or cable, thereby resource consumption is big, and is unfavorable for taking over seamlessly of different systems.
Summary of the invention
In view of this, data transmission method and system that main purpose of the present invention is to provide a kind of WCDMA of realization and CDMA compatibility can save device resource, and help taking over seamlessly of different systems.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of data transmission method of realizing WCDMA and CDMA compatibility comprises:
Transmitting terminal is mapped to the business datum of cdma system and/or WCDMA system in the basic frame of CPRI according to predetermined speed, and the business datum that will shine upon back cdma system and/or WCDMA system is assigned to zones of different in the basic frame of CPRI according to system configuration;
Transmitting terminal sends to receiving terminal with basic frame of described CPRI and system configuration information;
Receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI that receives, and the data in the basic frame of CPRI are carried out demultiplexing according to the system configuration information that receives, and will separate mapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements through the later cdma system of demultiplexing and/or the business datum of WCDMA system.
Described transmitting terminal is mapped to the business datum of cdma system and/or WCDMA system in the basic frame of CPRI according to predetermined speed:
Determine the traffic data rate V of cdma system CDMAWith the basic frame rate V of CPRI CPRICommon multiple relation: N CDM A × V CDMA = N CPR I × V CPRI ;
Described common multiple relation table is shown N CPRI=MxN CDMA+ N LForm, thereby determine N CDMAIndividual CDMA data arrive (N according to the M time division multiplexing that concerns doubly CPRI-N L) in the basic frame of individual CPRI.
Described V CDMAAnd V CPRICommon multiple to close be the least common multiple relation.
The business datum that described transmitting terminal will shine upon back cdma system and/or WCDMA system according to the zones of different that system configuration is assigned in the basic frame of CPRI is:
Transmitting terminal is made into N with the basic frame average mark of CPRI AxCIndividual AxC, each AxC has M AxCIndividual bit;
The bit number M of each AxC AxCEqual cdma service data sampling bit wide M CDMA, then with (N CPRI-N L) in N AxCIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data; M AxCLess than M CDMA, then with (N CPRI-N L) in N AxC_ LIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, (N AxC-N AxC_L) individual AxC is used to transmit N AxC_LIn (M in the corresponding WCDMA/CDMA business datum CDMA-M AxC) or (M WCDMA-M AxC) Bit data, wherein, N AxC_LBe not less than zero and less than N AxCM AxCGreater than M CDMA, then with (N CPRI-N L) in N AxCIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, wherein, (the M among each AxC AxC-M CDMA) or (M AxC-M WCDMA) bit can fill any information or vacant.
The system configuration information that described transmitting terminal sends to receiving terminal is: M AxC=M CDMAAnd M AxC＞M CDMASituation under, be N AxCThe corresponding pattern information of individual AxC configuration; M AxC＜M CDMAAnd N AxC_LIn transmitted bit and be wider than under the AxC capacity model data conditions (N AxC-N AxC_L) do not dispose pattern information, the remaining bits of default transport associative mode data.
Described receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI that receives, and according to the system configuration information that receives the data in the basic frame of CPRI is carried out demultiplexing and be:
The AxC pattern configurations information that the receiving terminal receiving end/sending end sends, the standard information of each AxC loaded service data in the basic frame of clear and definite CPRI;
Receiving terminal obtains the traffic data rate V of cdma system according to the transmitting terminal setting CDMAWith the basic frame rate V of CPRI CPRIRelation, calculate both common multiple relation;
Receiving terminal obtains N according to the transmitting terminal setting AxCAnd M AxC
Receiving terminal is resolved the data in the basic frame of CPRI according to the transmitting terminal setting.
A kind of data transmission system that realizes WCDMA and CDMA compatibility comprises transmitting terminal and receiving terminal, and described transmitting terminal comprises the interweaving and framing module, system configuration information sending module of IQ data of mapping block, Multiplexing module, CPRI; Described receiving terminal comprises that system configuration information receiver module, CPRI separate frame and IQ data deinterlacing module, demultiplexing module are conciliate mapping block, wherein,
Described mapping block is used for the business datum of cdma system and/or WCDMA system is mapped to the basic frame of CPRI according to predetermined speed;
Described Multiplexing module, the business datum of cdma system and/or WCDMA system is assigned to the zones of different of the basic frame of CPRI after being used for shining upon according to system configuration;
Interweaving and the framing module of the IQ data of described CPRI, be used for the business datum of cdma system after multiplexing and/or WCDMA system is carried out IQ data interlacing and framing, and the business datum after will handling is sent to receiving terminal;
Described system configuration information sending module is used for system configuration information is sent to receiving terminal;
Described system configuration information receiver module is used to receive the system configuration information from the system configuration information sending module;
Described CPRI separates frame and IQ data deinterlacing module, be used for the basic frame of the CPRI that receives is separated frame and data deinterlacing, and the basic frame of the CPRI after will handling is sent to demultiplexing module;
Described demultiplexing module, being used for the system configuration information that receives according to the system configuration information receiver module will carry out demultiplexing from the data that CPRI separates the basic frame of CPRI of frame and IQ data deinterlacing module, and will be sent to through the business datum of later cdma system of demultiplexing and/or WCDMA system and separate mapping block;
The described mapping block of separating, be used for and separate mapping from the later cdma system of the demultiplexing of demultiplexing module and/or the business datum of WCDMA system according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
The present invention realizes the data transmission method and the system of CDMA and WCDMA compatibility, send part in business datum, to CPRI basic frame carry out business datum interweave and framing before, the business datum of cdma system and/or WCDMA system is mapped in the basic frame of CPRI according to predetermined speed, the business datum of mapping back cdma system and/or WCDMA system is assigned in the basic frame of CPRI according to system configuration, and system configuration information is sent to receiving terminal by transmitting terminal by certain way; At the business datum receiving unit, after basic frame is separated frame and data deinterlacing to CPRI, according to the system configuration information that receives the data in the basic frame of CPRI are carried out demultiplexing, will separate mapping according to predetermined speed and recover the data format of CDMA and/or WCDMA system requirements through the business datum of later CDMA of demultiplexing and/or WCDMA system again.Because the present invention can realize CDMA single mode business datum, WCDMA single mode business datum or two kinds of standard business datums of WCDMA/CDMA and transmit on same physical connection, really realized the transmission of bimodule service data compatibility, so, can save device resource, and help the exploitation and the realization with multimode REC/RE of taking over seamlessly of different systems.
Description of drawings
Fig. 1 is the networking mode schematic diagram of cdma system of the present invention and WCDMA system compatible;
Fig. 2 realizes the data transmission method schematic flow sheet of CDMA and WCDMA compatibility for the present invention;
The business datum that Fig. 3 will shine upon the back cdma system for the present invention is assigned to the schematic flow sheet of the basic frame of CPRI;
Fig. 4 realizes the data transmission system structural representation of WCDMA and CDMA compatibility for the present invention;
Fig. 5 sends and the realization WCDMA system of receiving function and the apparatus structure schematic diagram of cdma system compatibility for having simultaneously;
Fig. 6 is the data transmission method schematic flow sheet that the embodiment of the invention 1 realizes CDMA and WCDMA compatibility;
Fig. 7 is that the cdma system business datum is shone upon the situation schematic diagram to the basic frame of CPRI in the embodiment of the invention 1;
The structural representation of the basic frame of CPRI when Fig. 8 is 1.2288Gbps for the CPRI interface rate;
The AxC subchannel dividing condition schematic diagram of the basic frame of CPRI when Fig. 9 is 1.2288Gbps for the CPRI interface rate;
Figure 10 is the down going channel frame structure schematic diagram of cdma system and WCDMA system compatible;
Figure 11 is the data feedback channel frame structure schematic diagram of cdma system and WCDMA system compatible;
Figure 12 is the embodiment of the invention 1 a concrete down going channel mapping relations schematic diagram;
Figure 13 is the embodiment of the invention 1 a concrete data feedback channel mapping relations schematic diagram.
Embodiment
Basic thought of the present invention is: send part in business datum, to CPRI basic frame carry out business datum interweave and framing before, the business datum of cdma system and/or WCDMA system is mapped in the basic frame of CPRI according to predetermined speed, the business datum of mapping back cdma system and/or WCDMA system is assigned in the basic frame of CPRI according to system configuration, and system configuration information is sent to receiving terminal by transmitting terminal by certain way; At the business datum receiving unit, after basic frame is separated frame and data deinterlacing to CPRI, according to the system configuration information that receives the data in the basic frame of CPRI are carried out demultiplexing, will separate mapping according to predetermined speed and recover the data format of CDMA and/or WCDMA system requirements through the business datum of later CDMA of demultiplexing and/or WCDMA system again.
Fig. 1 is the networking mode schematic diagram of cdma system of the present invention and WCDMA system compatible, and as shown in Figure 1, REC links to each other with CDMA single mode, WCDMA single mode, CDMA and the RE of WCDMA bimodulus by optical fiber.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
Fig. 2 realizes the data transmission method schematic flow sheet of CDMA and WCDMA compatibility for the present invention, and as shown in Figure 2, the present invention realizes that the data transmission method of CDMA and WCDMA compatibility generally comprises following steps:
Step 21: transmitting terminal is mapped to the business datum of cdma system and/or WCDMA system in the basic frame of CPRI according to predetermined speed.
The business datum that sends cdma system with transmitting terminal is an example, and transmitting terminal is specifically according to the traffic data rate V of cdma system CDMAWith the basic frame rate V of CPRI CPRI, calculate both common multiple relation, as shown in Equation (1):
N CDM A × V CDMA = N CPR I × V CPRI (1)
Formula (1) also can be expressed as:
N CPRI＝MxN CDMA+N L (2)
According to formula (2), just can be with N CDMAIndividual CDMA data arrive (N according to the M time division multiplexing that concerns doubly CPRI-N L) in the basic frame of individual CPRI, remaining N LMay reside in N CPRIThe optional position of the basic frame of individual CPRI, can be used to transmit the out of Memory data also can be vacant, do not carry out mandatory provision herein.
In addition, need to prove that the described common multiple relation of this step is advised but is not limited to the least common multiple relation.
Step 22: the business datum that transmitting terminal will shine upon back cdma system and/or WCDMA system is assigned to zones of different in the basic frame of CPRI according to system configuration, and sends the basic frame of described CPRI.
The business datum that sends cdma system with transmitting terminal is that example describes this step, and is consistent with the cdma service data processing method for WCDMA business data processing mode.The business datum that Fig. 3 will shine upon the back cdma system for the present invention is assigned to the schematic flow sheet of the basic frame of CPRI, and as shown in Figure 3, invention will shine upon afterwards the business datum of cdma system and is assigned to the basic frame of CPRI and generally comprise following steps:
Step 221: transmitting terminal is being made into N with the basic frame average mark of CPRI according to the information of supporting under cdma system and WCDMA system business data sampling bit wide, sample rate, the certain bandwidth such as contained fan number under certain bandwidth AxCIndividual AxC, each AxC has M AxCIndividual bit.
The notion that the present invention is based on AxC is carried out mode division, can transmit different systems on different AxC, and structure is more clear, is convenient to realize.
Step 222: transmitting terminal is judged the bit number M of each AxC AxCWhether equal cdma service data sampling bit wide M CDMA, i.e. M AxC=M CDMAWhether set up, if, execution in step 223; Otherwise, execution in step 224.
Step 223: according to system configuration, with (N CPRI-N L) in N AxCIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, and wherein CDMA pattern corresponding A xC carries out time division multiplexing transmission of CDMA business datum according to M relation doubly, and step 22 flow process finishes.
Step 224: transmitting terminal is judged the bit number M of each AxC AxCWhether less than cdma service data sampling bit wide M CDMA, i.e. M AxC＜M CDMAWhether set up, if, execution in step 225; Otherwise, i.e. M AxC＞M CDMA, execution in step 226.
Step 225: transmitting terminal is according to system configuration, with (N CPRI-N L) in N AxC_LIndividual AxC (0≤N AxC_L≤ N AxC) being configured to the WCDMA/CDMA pattern, correspondence is transmitted WCDMA/CDMA mode business data, (N AxC-N AxC_L) individual AxC is used to transmit N AxC_LIn (M in the corresponding WCDMA/CDMA business datum CDMA-M AxCPerhaps M WCDMA-M AxC) Bit data, wherein CDMA pattern corresponding A xC carries out time division multiplexing transmission of CDMA business datum according to M relation doubly, step 22 flow process finishes.
Step 226: according to system configuration, with (N CPRI-N L) in N AxCIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business the data, (M among each AxC AxC-M CDMAPerhaps M AxC-M WCDMA) bit can fill any information, also can be vacant, wherein CDMA pattern corresponding A xC carries out time division multiplexing transmission of CDMA business datum according to M relation doubly, and step 22 flow process finishes.
As can be seen, the present invention suitably splits real data according to AxC and real data bit wide relation, and bandwidth availability ratio is higher under a stable condition, and, the present invention is with the CDMA data rate and the basic frame rate of CPRI is adaptive and the frame of according to circumstances leaving a blank in advance, data is not averaged distribution, therefore, do not need extra timing information and compensation of delay, make that relevant timing information is simple, carry out the transmission and the extraction of business datum easily, be convenient to realize interconnecting of REC and RE.
Step 23: transmitting terminal sends to receiving terminal with system configuration information, and system configuration information wherein comprises the division information and the AxC pattern configurations information of the zones of different in the basic frame of CPRI.
Concrete, transmitting terminal is given receiving terminal with the pattern configurations information of each AxC carrying by other channel transfer of CPRI according to step 22 according to system configuration, and be convenient to receiving terminal and carry out data parsing according to same configuration mode, wherein, at M AxC=M CDMAAnd M AxC＞M CDMASituation under, be N AxCThe corresponding pattern information of individual AxC configuration is at M AxC＜M CDMASituation under, if N AxC_LIn transmitted bit and be wider than under the AxC capacity model data conditions (N AxC-N AxC_L) can not configuration mode information, the remaining bits of default transport associative mode data.
The present invention does not limit the sending order of configuration information and the basic frame of CPRI.
Step 24: receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI that receives, and according to the system configuration information that receives the data in the basic frame of CPRI is carried out demultiplexing.
Receiving terminal carries out demultiplexing according to the system configuration information that receives with the data in the basic frame of CPRI and specifically comprises:
The system configuration information that the receiving terminal receiving end/sending end sends, the standard information of each AxC loaded service data in the basic frame of clear and definite CPRI;
Receiving terminal obtains the traffic data rate V of cdma system according to the transmitting terminal setting CDMAWith the basic frame rate V of CPRI CPRIRelation, calculate both common multiple relation (corresponding step 21);
Receiving terminal obtains N according to the transmitting terminal setting AxCAnd M AxC(corresponding step 221);
Receiving terminal is according to the transmitting terminal setting, according to the unified rule of transmitting terminal the data in the basic frame of CPRI being resolved, that is:
Corresponding step 223 is with (N CPRI-N L) in N AxCIndividual AxC parses CDMA data and WCDMA data according to configuration information, and decomposition multiplex parsed the cdma service data when wherein CDMA pattern corresponding A xC carried out according to M relation doubly;
Perhaps, corresponding step 225 is resolved N according to configuration information respectively AxC_L(N AxC-N AxC_L) the corresponding service data, and, parse complete CDMA and WCDMA business datum with both corresponding datas merging connections, wherein CDMA pattern corresponding A xC carries out time division multiplexing transmission of CDMA business datum according to M relation doubly;
Perhaps, corresponding step 226 is obtained (N CPRI-N L) in N AxC_LThe WCDMA/CDMA pattern that individual AxC is corresponding respectively, and with (the M among each AxC AxC-M CDMA/ M WCDMA) the bit dissection process, parse complete CDMA and WCDMA business datum, wherein CDMA pattern corresponding A xC carries out time division multiplexing transmission of CDMA business datum according to M relation doubly.
Step 25: receiving terminal will be separated mapping according to described predetermined speed through the later cdma system of demultiplexing and/or the business datum of WCDMA system, and recover the data format of cdma system and/or WCDMA system requirements.
Here, be example with the business datum that receives cdma system, specifically the relation according to formula (1) recovers the CDMA data.
Fig. 4 realizes the data transmission system structural representation of WCDMA and CDMA compatibility for the present invention, as shown in Figure 4, the present invention realizes that the data transmission system of WCDMA and CDMA compatibility comprises transmitting terminal 41 and receiving terminal 42, and transmitting terminal 41 specifically comprises the interweaving and framing module 413, system configuration information sending module 414 of IQ data of mapping block 411, Multiplexing module 412, CPRI; Receiving terminal 42 comprises that specifically system configuration information receiver module 421, CPRI separate frame and IQ data deinterlacing module 422, demultiplexing module 423 are conciliate mapping block 424, wherein,
Mapping block 411 is used for the business datum of cdma system and/or WCDMA system is mapped to the basic frame of CPRI according to predetermined speed;
Multiplexing module 412, the business datum of cdma system and/or WCDMA system is assigned to the zones of different of the basic frame of CPRI after being used for shining upon according to system configuration;
Interweaving and framing module 413 of the IQ data of CPRI is used for the business datum of cdma system after multiplexing and/or WCDMA system is carried out IQ data interlacing and framing, and will handle even business datum and be sent to receiving terminal 42;
System configuration information sending module 414 is used for system configuration information is sent to receiving terminal 42;
System configuration information receiver module 421 is used to receive the system configuration information from system configuration information sending module 414;
CPRI separates frame and IQ data deinterlacing module 422, be used for the basic frame of the CPRI that receives is separated frame and data deinterlacing, and the basic frame of the CPRI after will handling is sent to demultiplexing module 423;
Demultiplexing module 423, being used for the system configuration information that receives according to system configuration information receiver module 421 will carry out demultiplexing from the data that CPRI separates the basic frame of CPRI of frame and IQ data deinterlacing module 422, and will be sent to through the business datum of later cdma system of demultiplexing and/or WCDMA system and separate mapping block 424;
Separate mapping block 424, be used for and separate mapping from the later cdma system of the demultiplexing of demultiplexing module 423 and/or the business datum of WCDMA system according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
Have simultaneously send and the apparatus structure of the realization WCDMA system of receiving function and cdma system compatibility as shown in Figure 5.
Embodiment 1
Fig. 6 is the data transmission method schematic flow sheet that the embodiment of the invention 1 realizes CDMA and WCDMA compatibility, and as shown in Figure 6, the embodiment of the invention 1 realizes that the data transmission method of CDMA and WCDMA compatibility comprises:
Step 601: the corresponding relation of determining CDMA data rate and the basic frame rate of CPRI.
Because the cycle of the basic frame of CPRI is 1/3.84MHz, the cycle of 1CHIP just, and the cycle of the 1CHIP of CDMA is 1/1.2288MHz, determines both least common multiple relations: 25/3.84=8/1.2288.
Step 602: the CDMA data rate of determining according to step 601 and the corresponding relation of the basic frame rate of CPRI suitably change the CDMA data structure.
Form after the variation as shown in Equation (2), in the present embodiment 25=3 * 8+1, that is to say, the basic frame of 3 CPRI, correspond to basic frame of CDMA (in order to say something, the basic frame of a CDMA of definition). like this, in the time that sends 25 basic frames of CPRI, can send the basic frame of 8 CDMA, the basic frame of a unnecessary CPRI of while. the cdma system business datum is to the basic frame mapping of CPRI situation as shown in Figure 7 in the embodiment of the invention 1, the structure of the basic frame of CPRI was as shown in Figure 8 when in addition, the CPRI interface rate was 1.2288Gbps.
Step 603: according to CDMA and WCDMA system requirements, and bandwidth availability ratio maximum under certain bandwidth, support contained fan to count the principle of maximum, the basic frame of CPRI is divided into a plurality of AxC.
In the present embodiment,, determine that CDMA down going channel data sampling bit wide is 16bit, 1 sampling rate according to CDMA and WCDMA system requirements; WCDMA down going channel data sampling bit wide is 15bit, 1 sampling rate; CDMA data feedback channel data sample bits is wide to be 4bit, 2 sampling rates, main diversity mode (just 4 * 2 * 2=16bit); WCDMA data feedback channel data sample bits is wide to be 7bit, 2 sampling rates (just 7 * 2=14bit), then, count the principle of maximum according to bandwidth availability ratio maximum, support contained fan under certain bandwidth, determine 1 basic frame of CPRI is divided into 8 AxC, each AxC is 30bit, and the AxC subchannel dividing condition of the basic frame of CPRI specifically as shown in Figure 9 when the CPRI interface rate was 1.2288Gbps.
Step 604: because each AxC is 30bit, determine that CDMA down going channel data sampling bit wide is 16bit, 1 sampling rate, WCDMA down going channel data sampling bit wide is 15bit, 1 sampling rate.So, determine M AxC＜M CDMA
Step 605: preceding 7 AxC of down going channel are used to transmit the preceding 15bit data and the whole 15bit data of WCDMA of CDMA data, and last 1 AxC is used for transmitting the last 1bit data of the CDMA data that preceding 7 AxC exist or does not carry at preceding 7 AxC and all is used to transmit the WCDMA data under the CDMA data conditions.
Wherein, when being used to transmit the CDMA data, certain AxC can transmit 3 road CDMA data according to time division multiplexing, Figure 10 is the down going channel frame structure schematic diagram of cdma system and WCDMA system compatible, Figure 11 is the data feedback channel frame structure schematic diagram of cdma system and WCDMA system compatible, that is to say, transmitting terminal can transmit 8 road WCDMA data under WCDMA single mode situation, can transmit 21 road CDMA data under the CDMA single mode situation, mixes under the mould situation and can transmit W MRoad WCDMA data and W C* 3 road CDMA data, wherein W M+ W C=7.Concrete down going channel mapping relations are seen accompanying drawing 12 for example, and concrete data feedback channel mapping relations are seen accompanying drawing 13 for example.
Step 606: transmitting terminal is determined the AxC associative mode configuration information in the basic frame of CPRI, and this configuration information is passed through Slow C﹠amp; The M channel transfer is given receiving terminal, is convenient to receiving terminal and carries out data parsing according to same configuration mode.
With Figure 12 is example, according to the relation of determining in the step 602, in preceding 24 basic frames, AxC0, AxC2, AxC5 are used to carry the WCDMA business datum, AxC1, AxC3, AxC4, AxC6 are used for carrying and are used to carry the cdma service data, AxC7 since the CDMA data bit width greater than the AxC bit wide, so AxC7 can not transmit normal data, do not need configuration mode information, but transmit the residue bit of carrying CDMA data among AxC0～AxC6.In the 25th basic frame, AxC0, AxC2, AxC5 still are used to carry the WCDMA business datum, and other AxC all keeps.
Step 607: receiving terminal is at first from Slow C﹠amp; The M passage parses the AxC associative mode configuration information in the basic frame.
Step 608: receiving terminal is according to the traffic data rate V of cdma system CDMAWith the basic frame rate V of CPRI CPRIRelation, calculate both common multiple relation, 25=3 * 8+1 that is to say, the basic frame of 3 CPRI corresponds to basic frame of CDMA.Like this, in the time that sends 25 basic frames of CPRI, can send the basic frame of 8 CDMA, simultaneously the basic frame of a unnecessary CPRI.
Step 609: receiving terminal supports contained fan to count the principle of maximum according to bandwidth availability ratio maximum under certain bandwidth, determines 1 basic frame of CPRI is divided into 8 AxC, and each AxC is 30bit.
Step 610: because each AxC is 30bit, determine that CDMA down going channel data sampling bit wide is 16bit, 1 sampling rate, WCDMA down going channel data sampling bit wide is 15bit, 1 sampling rate is determined M AxC＜M CDMA
Step 611: according to step 607 pattern configurations information, determine each AxC data carried by data pattern information, as accompanying drawing 12 and 13,8 AxC of preceding 24 basic frames, what AxC0, AxC2, AxC5 carried is the WCDMA data, what AxC1, AxC3, AxC4, AxC6 carried is the CDMA data, the descending lowest order that is used to carry corresponding CDMA data in AxC7 relevant position, uply be used to carry CDMA data extreme lower position and RAB information, and decomposition multiplex when the CDMA data are carried out according to 3 times relation, for example AxC1, AxC7bit7～4 correspondence when BFN=0 resolves to CDMA IQ C0 business datum, correspondence resolves to CDMA IQ when BFN=1 C1 business datum, correspondence resolves to CDMA IQ when BFN=2 C2 business datums; AxC0, AxC2, AxC5 carrying is the WCDMA data in the 25th basic frame, and other position keeps.
Step 612: according to system configuration, with (N CPRI-N L) in N AxCIndividual AxC parses CDMA data and WCDMA data according to configuration information, and decomposition multiplex parsed the cdma service data when wherein CDMA pattern corresponding A xC carried out according to M relation doubly.
Step 613:, obtain (N according to system configuration CPRI-N L) in N AxC_LThe WCDMA/CDMA pattern that individual AxC is corresponding respectively, and resolve N according to configuration information respectively AxC_L(N AxC-N AxC_L) the corresponding service data, and, parse complete CDMA and WCDMA business datum with both corresponding datas merging connections, wherein CDMA pattern corresponding A xC carries out time division multiplexing transmission of CDMA business datum according to M relation doubly.
Step 614: according to the parsing of step 613, each basic frame data parsing is recovered normal data bit width, shown in accompanying drawing 12,13, down going channel WCDMA data are 15bit sampling bit wide, 1 sampling rate, the 3.84M spreading rate, the CDMA data are for being 16bit sampling bit wide, 1 sampling rate, the 1.28M spreading rate; Data feedback channel WCDMA data are 7bit sampling bit wide, 2 sampling rates, 7.68 spreading rates, CDMA data feedback channel data sample bits is wide to be 4bit, 2 sampling rates, main diversity mode (4x2x2=16bit just) adds the 1bit RAB information of each data channel correspondence.
Step 615: according to the relation of definition in the step 608, the 1.28M CDMA that step 614 is obtained reverts to the 1.2288M data that cdma system is stipulated, as shown in Figure 7.
According to above description, the present invention has the following advantages owing to take above technical scheme:
Two kinds of different wireless communication modes of WCDMA system and cdma system are unified at bottom L2 layer, and realized interconnecting of REC and RE by same transmission medium;
With the CDMA data rate and the basic frame rate of CPRI is adaptive and according to circumstances leave a blank frame in advance, data are not averaged distribution, therefore do not need extra timing information and compensation of delay, make that relevant timing information is simple, carry out the transmission and the extraction of business datum easily, be convenient to realize interconnecting of REC and RE;
The notion that the present invention is based on AxC is carried out mode division, can transmit different systems on different AxC, and structure is more clear, is convenient to realize;
The present invention suitably splits real data according to AxC and real data bit wide relation, and bandwidth availability ratio is higher under a stable condition;
The present invention is based on method that the notion of AxC carries out the business datum mode assignments for chain networking, the processing mode of different RE complete unity, difference only is which AxC data this RE uses, and is beneficial to the realization of RE side, also helps multimode RE exploitation.
Need to prove, the method that the present invention proposes is applicable to the compatibility transmission of two kinds of different radio service datas of WCDMA system and cdma system, but be not limited thereto two kinds of patterns, can be applied to the compatibility transmission of multiple standard radio service data equally, autgmentability is better.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (7)

1. data transmission method of realizing WCDMA and CDMA compatibility is characterized in that this method comprises:
Transmitting terminal is mapped to the business datum of cdma system and/or WCDMA system in the basic frame of CPRI according to predetermined speed, and the business datum that will shine upon back cdma system and/or WCDMA system is assigned to zones of different in the basic frame of CPRI according to system configuration;
Transmitting terminal sends to receiving terminal with basic frame of described CPRI and system configuration information;
Receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI that receives, and the data in the basic frame of CPRI are carried out demultiplexing according to the system configuration information that receives, and will separate mapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements through the later cdma system of demultiplexing and/or the business datum of WCDMA system.
2. the data transmission method of realization according to claim 1 WCDMA and CDMA compatibility is characterized in that, described transmitting terminal is mapped to the business datum of cdma system and/or WCDMA system in the basic frame of CPRI according to predetermined speed and is:
Determine the traffic data rate V of cdma system CDMAWith the basic frame rate V of CPRI CPRICommon multiple relation: N CDMA* V CDMA=N CPRI* V CPRI
Described common multiple relation table is shown N CPRI=MxN CDMA+ N LForm, thereby determine N CDMAIndividual CDMA data arrive (N according to the M time division multiplexing that concerns doubly CPRI-N L) in the basic frame of individual CPRI.
3. the data transmission method of realization WCDMA according to claim 1 and CDMA compatibility is characterized in that described V CDMAAnd V CPRICommon multiple to close be the least common multiple relation.
4. the data transmission method of realization WCDMA according to claim 2 and CDMA compatibility, it is characterized in that the business datum that described transmitting terminal will shine upon back cdma system and/or WCDMA system according to the zones of different that system configuration is assigned in the basic frame of CPRI is:
Transmitting terminal is made into N with the basic frame average mark of CPRI AxCIndividual AxC, each AxC has M AxCIndividual bit;
The bit number M of each AxC AxCEqual cdma service data sampling bit wide M CDMA, then with (N CPRI-N L) in N AxCIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data; M AxCLess than M CDMA, then with (N CPRI-N in NL) AxC_ LIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, (N AxC-N AxC_L) individual AxC is used to transmit N AxC_LIn (M in the corresponding WCDMA/CDMA business datum CDMA-M AxC) or (M WCDMA-M AxC) Bit data, wherein, N AxC_LBe not less than zero and less than N AxCM AxCGreater than M CDMA, then with (N CPRI-N L) in N AxCIndividual AxC is configured to the WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, wherein, (the M among each AxC AxC-M CDMA) or (M AxC-M WCDMA) bit can fill any information or vacant.
5. the data transmission method of realization WCDMA according to claim 4 and CDMA compatibility is characterized in that the system configuration information that described transmitting terminal sends to receiving terminal is: M AxC=M CDMAAnd M AxC＞M CDMASituation under, be N AxCThe corresponding pattern information of individual AxC configuration; M AxC＜M CDMAAnd N AxC_LIn transmitted bit and be wider than under the AxC capacity model data conditions (N AxC-N AxC_L) do not dispose pattern information, the remaining bits of default transport associative mode data.
6. the data transmission method of realization WCDMA according to claim 4 and CDMA compatibility, it is characterized in that, described receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI that receives, and according to the system configuration information that receives the data in the basic frame of CPRI is carried out demultiplexing and be:
The AxC pattern configurations information that the receiving terminal receiving end/sending end sends, the standard information of each AxC loaded service data in the basic frame of clear and definite CPRI;
Receiving terminal obtains the traffic data rate V of cdma system according to the transmitting terminal setting CDMAWith the basic frame rate V of CPRI CPRIRelation, calculate both common multiple relation;
Receiving terminal obtains N according to the transmitting terminal setting AxCAnd M AxC
Receiving terminal is resolved the data in the basic frame of CPRI according to the transmitting terminal setting.
7. a data transmission system that realizes WCDMA and CDMA compatibility comprises transmitting terminal and receiving terminal, it is characterized in that, described transmitting terminal comprises the interweaving and framing module, system configuration information sending module of IQ data of mapping block, Multiplexing module, CPRI; Described receiving terminal comprises that system configuration information receiver module, CPRI separate frame and IQ data deinterlacing module, demultiplexing module are conciliate mapping block, wherein,
Described mapping block is used for the business datum of cdma system and/or WCDMA system is mapped to the basic frame of CPRI according to predetermined speed;
Described Multiplexing module, the business datum of cdma system and/or WCDMA system is assigned to the zones of different of the basic frame of CPRI after being used for shining upon according to system configuration;
Interweaving and the framing module of the IQ data of described CPRI, be used for the business datum of cdma system after multiplexing and/or WCDMA system is carried out IQ data interlacing and framing, and the business datum after will handling is sent to receiving terminal;
Described system configuration information sending module is used for system configuration information is sent to receiving terminal;
Described system configuration information receiver module is used to receive the system configuration information from the system configuration information sending module;
Described CPRI separates frame and IQ data deinterlacing module, be used for the basic frame of the CPRI that receives is separated frame and data deinterlacing, and the basic frame of the CPRI after will handling is sent to demultiplexing module;
Described demultiplexing module, being used for the system configuration information that receives according to the system configuration information receiver module will carry out demultiplexing from the data that CPRI separates the basic frame of CPRI of frame and IQ data deinterlacing module, and will be sent to through the business datum of later cdma system of demultiplexing and/or WCDMA system and separate mapping block;
The described mapping block of separating, be used for and separate mapping from the later cdma system of the demultiplexing of demultiplexing module and/or the business datum of WCDMA system according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
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