CN101707499B - 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
CN101707499B
CN101707499B CN200910235905.6A CN200910235905A CN101707499B CN 101707499 B CN101707499 B CN 101707499B CN 200910235905 A CN200910235905 A CN 200910235905A CN 101707499 B CN101707499 B CN 101707499B
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cdma
axc
cpri
wcdma
data
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CN101707499A (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 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

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 data transmission method and the system of CDMA and WCDMA compatibility
Technical field
The present invention relates to the data transmission technology in mobile communication, relate in particular to a kind of code division multiple access (CDMA) data transmission method and system compatible with Wideband Code Division Multiple Access (WCDMA) (WCDMA) of realizing.
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 to the place of various needs.This framework has improved the flexibility of networking on the one hand, has reduced on the other hand the maintenance cost of network.Therefore, this framework more and more obtains user's approval, and application scenario is also more and more.2003, this framework has been carried out as a part for CPRI (Common Public RadioInterface) interface standard, and radio frequency unit is defined as to wireless device (Radio Equipment, RE), baseband processing unit is defined as to radio equipment controller (RadioEquipment Controller, REC) simultaneously.
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 transmission data in the standard of CDMA is 1.2288M, therefore, how the pattern of two kinds of different systems different pieces of information speed to be accomplished in a general-purpose system and be mapped in the basic frame of CPRI, complete the unification of two kinds of standard data L2 layer in CPRI, and then complete compatibility in same L1 layer physical channel and transmit simultaneously, become the difficult point of WCDMA system and the design of cdma system dual-mode base station.
The compatibility method of existing WCDMA system and cdma system is to switch in two cover codes, can not unify at bottom, can not really be called the compatibility of WCDMA system and cdma system, so, prior art need to realize by different optical fiber or cable the interconnection and interflow of REC and RE, thereby resource consumption is large, and be unfavorable for taking over seamlessly of different systems.
Summary of the invention
In view of this, main purpose of the present invention is to provide data transmission method and the system of a kind of WCDMA of realization and CDMA compatibility, can save device resource, and is conducive to taking over seamlessly of different systems.
For achieving the above object, technical scheme of the present invention is achieved in that
A data transmission method of realizing WCDMA and CDMA compatibility, comprising:
Transmitting terminal by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping in the basic frame of CPRI, and the business datum of cdma system and/or WCDMA system after mapping is assigned to the zones of different in the basic frame of CPRI according to system configuration;
Transmitting terminal sends to receiving terminal by the basic frame of described CPRI and system configuration information;
Receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI receiving, and according to the system configuration information receiving, the data in the basic frame of CPRI are carried out to demultiplexing, and the business datum of the cdma system after demultiplexing and/or WCDMA system is carried out to demapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
Described transmitting terminal by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping is in the basic frame of CPRI:
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 to N cPRI=MxN cDMA+ N lform, thereby determine N cDMAindividual CDMA data arrive (N according to the M time division multiplexing that is related to doubly cPRI-N l) in the basic frame of individual CPRI.
Described V cDMAand V cPRIcommon multiple to close be least common multiple relation.
The zones of different that described transmitting terminal is assigned to the business datum of cdma system and/or WCDMA system after mapping in the basic frame of CPRI according to system configuration is:
Transmitting terminal is made into N by 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, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data; M axCbe less than M cDMA, by (N cPRI-N l) in N axC_ lindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, (N axC-N axC_L) individual AxC is used for transmitting N axC_L(M in middle corresponding WCDMA/CDMA business datum cDMA-M axC) or (M wCDMA-M axC) Bit data, wherein, N axC_Lbe not less than zero and be less than N axC; M axCbe greater than M cDMA, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, wherein, (the M in each AxC axC-M cDMA) or (M axC-M wCDMA) bit can fill any information or vacant.
Described transmitting terminal sends to the system configuration information of receiving terminal to be: M axC=M cDMAand M axC> M cDMAsituation under, be N axCindividual AxC configures corresponding pattern information; M axC< M cDMAand N axC_Lthe middle bit that transmitted is wider than in the situation of AxC capacity model data, (N axC-N axC_L) do not configure 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 receiving, and according to the system configuration information receiving, the data in the basic frame of CPRI is carried out to demultiplexing and be:
The AxC pattern configurations information that receiving terminal receiving end/sending end sends, defines the standard information of the business datum of each AxC carrying in the basic frame of CPRI;
Receiving terminal, according to transmitting terminal setting, obtains the traffic data rate V of cdma system cDMAwith the basic frame rate V of CPRI cPRIrelation, calculate both common multiple relation;
Receiving terminal, according to transmitting terminal setting, obtains N axCand M axC;
Receiving terminal, according to transmitting terminal setting, is resolved the data in the basic frame of CPRI.
A 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, for by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping to the basic frame of CPRI;
Described Multiplexing module, for being assigned to the zones of different of the basic frame of CPRI by the business datum of cdma system and/or WCDMA system after mapping according to system configuration;
Interweaving and framing module of the IQ data of described CPRI, for the business datum of the cdma system to after multiplexing and/or WCDMA system, carry out IQ data interlacing and framing, and the business datum after processing is sent to receiving terminal;
Described system configuration information sending module, for sending to receiving terminal by system configuration information;
Described system configuration information receiver module, for receiving the system configuration information from system configuration information sending module;
Described CPRI separates frame and IQ data deinterlacing module, for the basic frame of the CPRI receiving is separated to frame and data deinterlacing, and the basic frame of CPRI after processing is sent to demultiplexing module;
Described demultiplexing module, for the system configuration information receiving according to system configuration information receiver module, the data of separating the basic frame of CPRI of frame and IQ data deinterlacing module from CPRI are carried out to demultiplexing, and the business datum of the cdma system after demultiplexing and/or WCDMA system is sent to demapping module;
Described demapping module, for the later cdma system of the demultiplexing from demultiplexing module and/or the business datum of WCDMA system are carried out to demapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
The present invention realizes data transmission method and the system of CDMA and WCDMA compatibility, in business datum transmitting portion, to CPRI basic frame carry out business datum interweave and framing before, by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping in the basic frame of CPRI, the business datum of cdma system and/or WCDMA system after mapping is assigned in the basic frame of CPRI according to system configuration, and by certain way, system configuration information is sent to receiving terminal by transmitting terminal; At business datum receiving unit, after to CPRI, basic frame is separated frame and data deinterlacing, according to the system configuration information receiving, the data in the basic frame of CPRI are carried out to demultiplexing, then the business datum of the CDMA after demultiplexing and/or WCDMA system is carried out to demapping and recovered CDMA and/or the data format of WCDMA system requirements according to predetermined speed.Because the present invention can realize the transmission on Same Physical connects of CDMA single mode business datum, WCDMA single mode business datum or two kinds of standard business datums of WCDMA/CDMA, really realized the transmission of bimodule service data compatibility, so, can save device resource, and be conducive to exploitation and the realization with multimode REC/RE that take over seamlessly of different systems.
Accompanying drawing explanation
Fig. 1 is the networking mode schematic diagram of cdma system of the present invention and WCDMA system compatible;
Fig. 2 is the data transmission method schematic flow sheet that the present invention realizes CDMA and WCDMA compatibility;
Fig. 3 is that the present invention is assigned to the business datum of cdma system after mapping the schematic flow sheet of the basic frame of CPRI;
Fig. 4 is the data transmission system structural representation that the present invention realizes WCDMA and CDMA compatibility;
Fig. 5 is for have the WCDMA system that realizes of sending and receiving function and the apparatus structure schematic diagram of cdma system compatibility simultaneously;
Fig. 6 is the data transmission method schematic flow sheet that the embodiment of the present invention 1 realizes CDMA and WCDMA compatibility;
Fig. 7 is that in the embodiment of the present invention 1, cdma system business datum is shone upon situation schematic diagram to the basic frame of CPRI;
Fig. 8 is the structural representation of CPRI interface rate basic frame of CPRI while being 1.2288Gbps;
Fig. 9 is the AxC subchannel dividing condition schematic diagram of CPRI interface rate basic frame of CPRI while being 1.2288Gbps;
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 concrete down going channel mapping relations schematic diagram of the embodiment of the present invention 1;
Figure 13 is the concrete data feedback channel mapping relations schematic diagram of the embodiment of the present invention 1.
Embodiment
Basic thought of the present invention is: in business datum transmitting portion, to CPRI basic frame carry out business datum interweave and framing before, by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping in the basic frame of CPRI, the business datum of cdma system and/or WCDMA system after mapping is assigned in the basic frame of CPRI according to system configuration, and by certain way, system configuration information is sent to receiving terminal by transmitting terminal; At business datum receiving unit, after to CPRI, basic frame is separated frame and data deinterlacing, according to the system configuration information receiving, the data in the basic frame of CPRI are carried out to demultiplexing, then the business datum of the CDMA after demultiplexing and/or WCDMA system is carried out to demapping and recovered CDMA and/or the data format of WCDMA system requirements according to predetermined speed.
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 is connected with CDMA single mode, WCDMA single mode, CDMA and the RE of WCDMA bimodulus by optical fiber.
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail.
Fig. 2 is the data transmission method schematic flow sheet that the present invention realizes CDMA and WCDMA compatibility, and as shown in Figure 2, the data transmission method that the present invention realizes CDMA and WCDMA compatibility generally comprises following steps:
Step 21: transmitting terminal by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping in the basic frame of CPRI.
The business datum that the transmitting terminal of take sends cdma system is 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 formula (1):
N CDMA &times; V CDMA = N CPRI &times; V CPRI - - - ( 1 )
Formula (1) also can be expressed as:
N CPRI＝MxN CDMA+N L (2)
According to formula (2), just can be by N cDMAindividual CDMA data arrive (N according to the M time division multiplexing that is related to 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 also can be vacant for transmitting out of Memory data, do not carry out mandatory provision herein.
In addition, it should be noted that the common multiple relation suggestion described in this step but be not limited to least common multiple relation.
Step 22: transmitting terminal is assigned to the zones of different in the basic frame of CPRI by the business datum of cdma system and/or WCDMA system after mapping according to system configuration, and sends the basic frame of described CPRI.
The business datum that the transmitting terminal of take sends cdma system describes this step as example, consistent with cdma service data processing method for WCDMA business data processing mode.Fig. 3 is that the present invention is assigned to the business datum of cdma system after mapping the schematic flow sheet of the basic frame of CPRI, and as shown in Figure 3, invention is assigned to the basic frame of CPRI by the business datum of cdma system after mapping and generally comprises following steps:
Step 221: transmitting terminal, according to the information such as contained fan number of supporting under cdma system and WCDMA system business data sampling bit wide, sample rate, certain bandwidth, is being made into N by the basic frame average mark of CPRI under certain bandwidth axCindividual AxC, each AxC has M axCindividual bit.
The concept that the present invention is based on AxC is carried out mode division, can on different AxC, transmit different systems, and structure is more clear, is convenient to realize.
Step 222: transmitting terminal judges 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 so, execution step 223; Otherwise, execution step 224.
Step 223: according to system configuration, by (N cPRI-N l) in N axCindividual AxC is configured to 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 judges the bit number M of each AxC axCwhether be less than cdma service data sampling bit wide M cDMA, i.e. M axC< M cDMAwhether set up, if so, execution step 225; Otherwise, i.e. M axC> M cDMA, execution step 226.
Step 225: transmitting terminal is according to system configuration, by (N cPRI-N l) in N axC_Lindividual AxC (0≤N axC_L≤ N axC) being configured to WCDMA/CDMA pattern, correspondence is transmitted WCDMA/CDMA mode business data, (N axC-N axC_L) individual AxC is used for transmitting N axC_(M in corresponding WCDMA/CDMA business datum in L cDMA-M axCor 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, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business the data, (M in each AxC axC-M cDMAor 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.
Can find out, the present invention, according to AxC and real data bit wide relation, suitably splits real data, and under a stable condition, bandwidth availability ratio is higher, and, the present invention is by 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 distributed equally, therefore, do not need extra timing information and compensation of delay, make relevant timing information simple, easily carry out transmission and the extraction of business datum, be convenient to realize interconnecting of REC and RE.
Step 23: transmitting terminal sends to receiving terminal by system configuration information, system configuration information wherein comprises division information and the AxC pattern configurations information of the zones of different in the basic frame of CPRI.
Concrete, transmitting terminal, according to system configuration, is crossed other passage of CPRI according to step 22 by the pattern configurations information exchange of each AxC carrying and is sent receiving terminal to, and be convenient to receiving terminal and carry out Data Analysis according to same configuration mode, wherein, at M axC=M cDMAand M axC> M cDMAsituation under, be N axCindividual AxC configures corresponding pattern information, at M axC< M cDMAsituation under, if N axC_Lthe middle bit that transmitted is wider than in the situation of AxC capacity model data, (N axC-N axC_L) can not configuration mode information, the remaining bits of default transport associative mode data.
The present invention is not construed as limiting 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 receiving, and according to the system configuration information receiving, the data in the basic frame of CPRI are carried out to demultiplexing.
Receiving terminal carries out demultiplexing according to the system configuration information receiving by the data in the basic frame of CPRI and specifically comprises:
The system configuration information that receiving terminal receiving end/sending end sends, defines the standard information of the business datum of each AxC carrying in the basic frame of CPRI;
Receiving terminal, according to transmitting terminal setting, obtains the traffic data rate V of cdma system cDMAwith the basic frame rate V of CPRI cPRIrelation, calculate both common multiple relation (corresponding step 21);
Receiving terminal, according to transmitting terminal setting, obtains N axCand M axC(corresponding step 221);
Receiving terminal is according to transmitting terminal setting, according to the data in the basic frame of CPRI being resolved with the unified rule of transmitting terminal, that is:
Corresponding step 223, by (N cPRI-N l) in N axCindividual AxC parses CDMA data and WCDMA data according to configuration information, and when wherein CDMA pattern corresponding A xC carries out according to M relation doubly, decomposition multiplex parses cdma service data;
Or corresponding step 225, resolves N according to configuration information respectively axC_L(N axC-N axC_L) corresponding business datum, and both corresponding datas are merged and connected, 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;
Or corresponding step 226, obtains (N cPRI-N l) in N axC_LwCDMA/CDMA pattern corresponding to individual AxC difference, and by (the M in each AxC axC-M cDMA/ M wCDMA) 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 carries out demapping by the business datum of the cdma system after demultiplexing and/or WCDMA system according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
Here, the business datum that receives cdma system of take is example, specifically according to the relation of formula (1), recovers CDMA data.
Fig. 4 is the data transmission system structural representation that the present invention realizes WCDMA and CDMA compatibility, as shown in Figure 4, the data transmission system that the present invention realizes 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 specifically comprises that 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, for by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping to the basic frame of CPRI;
Multiplexing module 412, for being assigned to the zones of different of the basic frame of CPRI by the business datum of cdma system and/or WCDMA system after mapping according to system configuration;
Interweaving and framing module 413 of the IQ data of CPRI, for the business datum of the cdma system to after multiplexing and/or WCDMA system, carry out IQ data interlacing and framing, and be sent to receiving terminal 42 by processing even business datum;
System configuration information sending module 414, for sending to system configuration information receiving terminal 42;
System configuration information receiver module 421, for receiving the system configuration information from system configuration information sending module 414;
CPRI separates frame and IQ data deinterlacing module 422, for the basic frame of the CPRI receiving is separated to frame and data deinterlacing, and the basic frame of CPRI after processing is sent to demultiplexing module 423;
Demultiplexing module 423, for the system configuration information receiving according to system configuration information receiver module 421, the data of separating the basic frame of CPRI of frame and IQ data deinterlacing module 422 from CPRI are carried out to demultiplexing, and the business datum of the cdma system after demultiplexing and/or WCDMA system is sent to demapping module 424;
Demapping module 424, for the later cdma system of the demultiplexing from demultiplexing module 423 and/or the business datum of WCDMA system are carried out to demapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements.
There is the WCDMA system that realizes of sending and receiving function and the apparatus structure of cdma system compatibility as shown in Figure 5 simultaneously.
Embodiment 1
Fig. 6 is the data transmission method schematic flow sheet that the embodiment of the present invention 1 realizes CDMA and WCDMA compatibility, and as shown in Figure 6, the data transmission method that the embodiment of the present invention 1 realizes CDMA and WCDMA compatibility comprises:
Step 601: the corresponding relation of determining CDMA data rate and the basic frame rate of CPRI.
Because cycle of the basic frame of CPRI is 1/3.84MHz, the cycle of 1CHIP namely, 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 corresponding relation according to the definite CDMA data rate of step 601 and the basic frame rate of CPRI, suitably changes CDMA data structure.
Form after variation, as shown in formula (2), is 25=3 * 8+1 in the present embodiment, that is to say that the basic frame of 3 CPRI corresponds to basic frame of CDMA (in order to describe the problem, the basic frame of a CDMA of definition).Like this, sending in the time of 25 basic frames of CPRI, can send the basic frame of 8 CDMA, simultaneously the basic frame of a unnecessary CPRI.In the embodiment of the present invention 1, to the basic frame mapping of CPRI situation as shown in Figure 7, in addition, when CPRI interface rate is 1.2288Gbps, the structure of the basic frame of CPRI as shown in Figure 8 for cdma system business datum.
Step 603: according to CDMA and WCDMA system requirements, and the principle that under certain bandwidth, bandwidth availability ratio is maximum, support contained fan is counted maximum, the basic frame of CPRI is divided into a plurality of AxC.
In the present embodiment, according to CDMA and WCDMA system requirements, 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; CDMA data feedback channel data sample bits is wide is 4bit, 2 sampling rates, main diversity mode (namely 4 * 2 * 2=16bit); WCDMA data feedback channel data sample bits is wide is 7bit, 2 sampling rates (namely 7 * 2=14bit), then,, support contained fan maximum according to bandwidth availability ratio under certain bandwidth counted the principle of maximum, determine 1 basic frame of CPRI is divided into 8 AxC, each AxC is 30bit, and when CPRI interface rate is 1.2288Gbps, the AxC subchannel dividing condition of the basic frame of CPRI specifically as shown in Figure 9.
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: front 7 AxC of down going channel are for transmitting front 15bit data and the whole 15bit data of WCDMA of CDMA data, last 1 AxC for the last 1bit data of the CDMA data that transmit front 7 AxC and exist or in the situation that front 7 AxC do not carry CDMA data all for transmitting WCDMA data.
Wherein, when being used for transmitting 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 in WCDMA single mode situation, can transmit 21 road CDMA data in CDMA single mode situation, in mixed mould situation, 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 shown in accompanying drawing 12 for example, and concrete data feedback channel mapping relations are shown in accompanying drawing 13 for example.
Step 606: transmitting terminal is determined the AxC associative mode configuration information in the basic frame of CPRI, and by Slow C & M passage, send this configuration information to receiving terminal, be convenient to receiving terminal and carry out Data Analysis according to same configuration mode.
Take Figure 12 as example, according to relation definite in step 602, in front 24 basic frames, AxC0, AxC2, AxC5 are used for carrying WCDMA business datum, AxC1, AxC3, AxC4, AxC6 are used for carrying cdma service data for carrying, AxC7 is because CDMA data bit width is greater than AxC bit wide, so AxC7 can not transmit normal data, do not need configuration mode information, but transmit the residue bit that carries CDMA data in AxC0～AxC6.In the 25th basic frame, AxC0, AxC2, AxC5 are still for carrying WCDMA business datum, and other AxC all retains.
Step 607: first receiving terminal parses the AxC associative mode configuration information basic frame from Slow C & M passage.
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, sending in the time of 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 is maximum according to bandwidth availability ratio under certain bandwidth, supports contained fan to count the principle of maximum, 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, determines M axC< M cDMA.
Step 611: according to step 607 pattern configurations information, determine the data pattern information of each AxC carrying, as accompanying drawing 12 and 13,8 AxC of front 24 basic frames, what AxC0, AxC2, AxC5 carried is WCDMA data, what AxC1, AxC3, AxC4, AxC6 carried is CDMA data, AxC7 relevant position is descending for carrying the lowest order of corresponding CDMA data, up for carrying CDMA data extreme lower position and RAB information, and decomposition multiplex when CDMA data are carried out according to the relation of 3 times, for example AxC1, AxC7bit7～4 correspondence when BFN=0 resolves to CDMA IQ c0 business datum, when BFN=1, correspondence resolves to CDMA IQ c1 business datum, when BFN=2, correspondence resolves to CDMA IQ c2 business datums; In the 25th basic frame, AxC0, AxC2, AxC5 carrying is WCDMA data, and other position retains.
Step 612: according to system configuration, by (N cPRI-N l) in N axCindividual AxC parses CDMA data and WCDMA data according to configuration information, and when wherein CDMA pattern corresponding A xC carries out according to M relation doubly, decomposition multiplex parses cdma service data.
Step 613: according to system configuration, obtain (N cPRI-N l) in N axC_LwCDMA/CDMA pattern corresponding to individual AxC difference, and according to configuration information, resolve N respectively axC_L(N axC-N axC_L) corresponding business datum, and both corresponding datas are merged and connected, 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 614: according to the parsing of step 613, each basic frame data is resolved and recovered normal data bit width, as shown in accompanying drawing 12,13, down going channel WCDMA data are 15bit sampling bit wide, 1 sampling rate, 3.84M spreading rate, CDMA data are for being 16bit sampling bit wide, 1 sampling rate, 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 is 4bit, 2 sampling rates, main diversity mode (namely 4x2x2=16bit), adds the 1bit RAB information that each data channel is corresponding.
Step 615: according to the relation of definition in step 608, the 1.28M CDMA that step 614 is obtained reverts to the 1.2288M data of cdma system regulation, as shown in Figure 7.
According to above description, the present invention, owing to taking above technical scheme, has the following advantages:
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;
By CDMA data rate and the adaptive frame of also according to circumstances leaving a blank in advance of the basic frame rate of CPRI, data are not distributed equally, therefore do not need extra timing information and compensation of delay, make relevant timing information simple, easily carry out transmission and the extraction of business datum, be convenient to realize interconnecting of REC and RE;
The concept that the present invention is based on AxC is carried out mode division, can on different AxC, transmit different systems, and structure is more clear, is convenient to realize;
The present invention, according to AxC and real data bit wide relation, suitably splits real data, and under a stable condition, bandwidth availability ratio is higher;
The present invention is based on method that the concept of AxC carries out business datum mode assignments for chain networking, the processing mode of different RE complete unity, difference is only which AxC data this RE is used, and is beneficial to the realization of RE side, is also conducive to multimode RE exploitation.
It should be noted that, the method that the present invention proposes is applicable to the compatible transmission of WCDMA system and two kinds of different radio service datas of cdma system, but be not limited to this two kinds of patterns, can be applied to equally the compatible transmission of multiple types radio service data, autgmentability is better.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.

Claims (5)

1. a data transmission method of realizing WCDMA and CDMA compatibility, is characterized in that, the method comprises:
Transmitting terminal by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping in the basic frame of CPRI, and the business datum of cdma system and/or WCDMA system after mapping is assigned to the zones of different in the basic frame of CPRI according to system configuration;
Transmitting terminal sends to receiving terminal by the basic frame of described CPRI and system configuration information;
Receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI receiving, and according to the system configuration information receiving, the data in the basic frame of CPRI are carried out to demultiplexing, and the business datum of the cdma system after demultiplexing and/or WCDMA system is carried out to demapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements;
Described transmitting terminal by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping is in the basic frame of CPRI:
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 to N cPRI=MxN cDMA+ N lform, thereby determine N cDMAindividual CDMA data arrive (N according to the M time division multiplexing that is related to doubly cPRI-N l) in the basic frame of individual CPRI;
The zones of different that described transmitting terminal is assigned to the business datum of cdma system and/or WCDMA system after mapping in the basic frame of CPRI according to system configuration is:
Transmitting terminal is made into N by 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, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data; M axCbe less than M cDMA, by (N cPRI-N l) in N axC_ lindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, (N axC-N axC_L) individual AxC is used for transmitting N axC_L(M in middle corresponding WCDMA/CDMA business datum cDMA-M axC) or (M wCDMA-M axC) Bit data, wherein, N axC_Lbe not less than zero and be less than N axC; M axCbe greater than M cDMA, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, wherein, (the M in each AxC axC-M cDMA) or (M axC-M wCDMA) bit can fill any information or vacant.
2. the data transmission method of realizing WCDMA and CDMA compatibility according to claim 1, is characterized in that described V cDMAand V cPRIcommon multiple to close be least common multiple relation.
3. the data transmission method of realizing WCDMA and CDMA compatibility according to claim 1, is characterized in that, described transmitting terminal sends to the system configuration information of receiving terminal to be: M axC=M cDMAand M axC>M cDMAsituation under, be N axCindividual AxC configures corresponding pattern information; M axC<M cDMAand N axC_Lthe middle bit that transmitted is wider than in the situation of AxC capacity model data, (N axC-N axC_L) do not configure pattern information, the remaining bits of default transport associative mode data.
4. the data transmission method of realizing WCDMA and CDMA compatibility according to claim 1, it is characterized in that, described receiving terminal is separated frame and data deinterlacing to the basic frame of the CPRI receiving, and according to the system configuration information receiving, the data in the basic frame of CPRI is carried out to demultiplexing and be:
The AxC pattern configurations information that receiving terminal receiving end/sending end sends, defines the standard information of the business datum of each AxC carrying in the basic frame of CPRI;
Receiving terminal, according to transmitting terminal setting, obtains the traffic data rate V of cdma system cDMAwith the basic frame rate V of CPRI cPRIrelation, calculate both common multiple relation;
Receiving terminal, according to transmitting terminal setting, obtains N axCand M axC;
Receiving terminal, according to transmitting terminal setting, is resolved the data in the basic frame of CPRI.
5. 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, for by the business datum of cdma system and/or WCDMA system according to predetermined Rate mapping to the basic frame of CPRI;
Described Multiplexing module, for being assigned to the zones of different of the basic frame of CPRI by the business datum of cdma system and/or WCDMA system after mapping according to system configuration;
Interweaving and framing module of the IQ data of described CPRI, for the business datum of the cdma system to after multiplexing and/or WCDMA system, carry out IQ data interlacing and framing, and the business datum after processing is sent to receiving terminal;
Described system configuration information sending module, for sending to receiving terminal by system configuration information;
Described system configuration information receiver module, for receiving the system configuration information from system configuration information sending module;
Described CPRI separates frame and IQ data deinterlacing module, for the basic frame of the CPRI receiving is separated to frame and data deinterlacing, and the basic frame of CPRI after processing is sent to demultiplexing module;
Described demultiplexing module, for the system configuration information receiving according to system configuration information receiver module, the data of separating the basic frame of CPRI of frame and IQ data deinterlacing module from CPRI are carried out to demultiplexing, and the business datum of the cdma system after demultiplexing and/or WCDMA system is sent to demapping module;
Described demapping module, for the later cdma system of the demultiplexing from demultiplexing module and/or the business datum of WCDMA system are carried out to demapping according to described predetermined speed, and recover the data format of cdma system and/or WCDMA system requirements;
Wherein, described mapping block, specifically for determining 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 to N cPRI=MxN cDMA+ N lform, thereby determine N cDMAindividual CDMA data arrive (N according to the M time division multiplexing that is related to doubly cPRI-N l) in the basic frame of individual CPRI;
Described Multiplexing module, specifically for being made into N by 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, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data; M axCbe less than M cDMA, by (N cPRI-N l) in N axC_ lindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, (N axC-N axC_L) individual AxC is used for transmitting N axC_L(M in middle corresponding WCDMA/CDMA business datum cDMA-M axC) or (M wCDMA-M axC) Bit data, wherein, N axC_Lbe not less than zero and be less than N axC; M axCbe greater than M cDMA, by (N cPRI-N l) in N axCindividual AxC is configured to WCDMA/CDMA pattern, corresponding transmission WCDMA/CDMA mode business data, wherein, (the M in each AxC axC-M cDMA) or (M axC-M wCDMA) bit can fill any information or vacant.
CN200910235905.6A 2009-10-29 2009-10-29 Data transmission method and system for realizing compatibility of CDMA and WCDMA Expired - Fee Related CN101707499B (en)

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