CN102065470A - Data transmission method, device and distributed base station system - Google Patents
Data transmission method, device and distributed base station system Download PDFInfo
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- CN102065470A CN102065470A CN200910223372XA CN200910223372A CN102065470A CN 102065470 A CN102065470 A CN 102065470A CN 200910223372X A CN200910223372X A CN 200910223372XA CN 200910223372 A CN200910223372 A CN 200910223372A CN 102065470 A CN102065470 A CN 102065470A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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- H04W88/085—Access point devices with remote components
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Abstract
The invention discloses a data transmission method, a data transmission device and a distributed base station system. The method comprises that: a radio remote unit (RRU) compresses in-phase/quadrature (I/Q) paths of data of each antenna, and generates a message code stream by using the compressed data; the RRU transmits the generated message code stream to a base band unit (BBU); and the BBU receives the message code stream, extracts the I/Q paths of compressed data from the message code stream and decompresses the I/Q paths of compressed data to obtain the I and Q paths of data of each antenna. In the data transmission method, the data transmission device and the distributed base station system, the I/Q paths of data of each antenna are compressed on the RRU side, and the I/Q paths of compressed data are transmitted between the RRU and the BBU by adopting an optimal module supporting a relatively lower data transmission rate, and the I/Q paths of compressed data are decompressed to recover the compressed data on the BBU side. Therefore, a link bearing rate is increased on the bases of not increasing the cost and using the optimal module supporting the relatively lower data transmission rate.
Description
Technical field
The present invention relates to the distributed base station technology in the mobile communication system, relate in particular to a kind of data transmission method, device and distributed base station system.
Background technology
In present 3G system, distributed base station is used on a large scale, distributed base station is by Remote Radio Unit (Radio Remote Unit, RRU) and indoor baseband processing unit (Building Base band Unit) form, be connected by optical fiber between BBU and RRU, RRU is connected to antenna.
(the Open Base Station Architecture Initiative of Open Base Station Architecture alliance, OBSAI) the link load-carry duty is lower in the agreement, the configuration of existing open base station is 10M for example, 4 arrangement of antennas, use the lower optical module (optical module of 1.5G) of base band data speed to get final product, if realize bigger link bearer rate, for example use the 10M bandwidth, 8 arrangement of antennas, can be so that the transmission quantity of data increases greatly, but such configuration must be used the optical module of supporting high data rate between RRU and BBU, the optical module of high data rate is because price is expensive, how on the basis of using the optical module of supporting lower data transmission rate, improves the link bearer rate as far as possible, not raising the cost again, is the industry problem demanding prompt solution.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method, device and distributed base station system, in order to solve on the basis that does not raise the cost, uses the optical module of supporting lower data transmission rate, realizes the problem of higher link bearer rate.
A kind of data transmission method that the embodiment of the invention provides comprises:
Radio frequency remote unit RRU is compressed the I/Q circuit-switched data of each antenna, and the data after will compressing generate message m essage code stream;
Described RRU is sent to indoor baseband processing unit BBU with the message code stream that generates;
Described BBU receives the message code stream, extracts the I/Q circuit-switched data after the compression from the message code stream, I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtains each antenna.
Further, RRU compresses the I/Q circuit-switched data, comprising:
From first data of M the bit bit wide on the I road of each antenna correspondence and Q road, extract M/2 bit data successively respectively by higher bit position to low bit, and the exponent data of the initial bits position of the record sign data of extracting; Described M is the I road of antenna and the original bit wide of Q circuit-switched data;
The exponent data of the M/2bit data extracted and 1bit is merged into second data of M/2+1 bit bit wide;
Second data on the I road of each antenna correspondence and Q road are merged into the 3rd data of M+2 bit bit wide;
The 3rd adjacent data of per two transmitting times of each antenna correspondence are merged, generate the 4th data of 2M+4 bit bit wide.
Further, the data after described will the compression generate the message code stream, comprising:
The 4th data of each antenna correspondence are write respectively in the first-in first-out cell fifo corresponding with each antenna;
Sense data from each cell fifo successively;
The bit width conversion of the data of reading is become to generate the required bit wide of message;
With the payload of the data after the conversion, generate the message code stream as message.
Further, extract I/Q circuit-switched data after the compression, comprising from message:
Extract the payload data of each message;
The payload data that extracts is carried out bit width conversion, convert the 4th data of 2M+4 bit bit wide to, the I/Q circuit-switched data after obtaining compressing.
Further, the I/Q circuit-switched data after the compression is decompressed and obtains I road and Q circuit-switched data respectively, comprising:
Described the 4th data transaction is become the 3rd data of M+2 bit bit wide;
Described the 3rd data further are split as second data of two-way M/2+1 bit bit wide;
Extract in two-way second data highest order data respectively as exponent data,, use data 0 data of the bit of the M/2 except that described exponent data in second data to be expanded generation I road and Q circuit-switched data according to the bit of described exponent data indication.
A kind of radio frequency remote unit RRU that the embodiment of the invention provides comprises:
Compression unit is used for the I/Q circuit-switched data that receives is compressed;
Message m essage generation unit be used for the data after the compression are generated the message code stream, and the message code stream that generates is sent to indoor baseband processing unit BBU.
Further, described compression unit, also be used for respectively extracting the data of M/2 bit successively by a high position to low level, and noting the exponent data of the initial bits position that characterizes the data of extracting from first data of M the bit bit wide on the I road of each antenna correspondence and Q road; Described M is the original bit wide of I road and Q circuit-switched data; The exponent data of the M/2bit data extracted and 1bit is merged into second data of M/2+1 bit bit wide; Second data on the I road of each antenna correspondence and Q road are merged into the 3rd data of M+2 bit bit wide; The 3rd adjacent data of per two transmitting times of each antenna correspondence are merged, generate the 4th data of 2M+4 bit bit wide.
Further, the Remote Radio Unit that the embodiment of the invention provides also comprises: read/write control unit, bit width conversion unit and first-in first-out cell fifo; Wherein:
Described read/write control unit is used for the 4th data after the compression are write the first-in first-out cell fifo corresponding with each antenna, and sense data from each cell fifo successively;
Described bit width conversion unit, the bit width conversion that is used for the data of will read becomes to generate the required bit wide of message;
Described message generation module also is used for the payload generation message code stream of the data after the bit width conversion as message;
Described cell fifo is used for the 4th data after the store compressed.
The embodiment of the invention also provides a kind of indoor baseband processing unit BBU, comprising:
Message m essage extraction unit is used for extracting the payload data of message as the I/Q circuit-switched data after compressing from the message code stream that radio frequency remote unit RRU sends;
The data decompression unit is used for I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtained each antenna respectively.
Further, the BBU that the embodiment of the invention provides also comprises: the bit width conversion unit is used for the payload data that described message extraction unit extracts is converted to the 4th data of 2M+4 bit bit wide; Described M is the I road of antenna and the original bit wide of Q circuit-switched data;
Described data decompression unit also is used for the 4th data transaction is become the 3rd data of M+2 bit bit wide; The 3rd data further are split as second data of two-way M/2+1 bit bit wide, extract in two-way second data highest order data respectively as exponent data, bit according to described exponent data indication, use data 0 that the data of the bit of the M/2 except that described exponent data in second data are expanded, generate I road and Q circuit-switched data.
The embodiment of the invention also provides a kind of distributed base station system, comprising:
Radio frequency remote unit RRU is used for the I/Q circuit-switched data that receives is compressed, and the data after the compression are generated message m essage code stream, and the message code stream that generates is sent to indoor baseband processing unit BBU;
Indoor baseband processing unit BBU, the payload data that is used for extracting message from the message code stream that RRU the sends I/Q circuit-switched data after as compression, I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtained each antenna respectively.
The beneficial effect of the embodiment of the invention comprises:
The data transmission method that the embodiment of the invention provides, device and distributed base station system, the radio frequency remote unit RRU side is compressed the I/Q circuit-switched data of each antenna, and the data after will compressing generate the message code stream; RRU is sent to indoor baseband processing unit BBU with the message code stream that generates; BBU extracts I road and the Q circuit-switched data that the I/Q circuit-switched data after compressing decompresses and obtains each antenna from the message code stream after receiving the message code stream.The embodiment of the invention is compressed the I/Q circuit-switched data of antenna in the RRU side, transmit between RRU and the BBU be the compression after the I/Q circuit-switched data, can adopt and support the optical module of lower data transmission rate to transmit, the I/Q circuit-switched data after the BBU side is to compression decompresses.Thereby realized improving the link bearer rate not increasing cost, using on the basis of the optical module of supporting lower data transmission rate.
Description of drawings
The flow chart of the data transmission method that Fig. 1 provides for the embodiment of the invention;
Fig. 2 moves towards figure for the data flow of the data transmission method that the embodiment of the invention provides;
Fig. 3 is the schematic diagram of the data of 9bit bit wide for the data compression with the 16bit bit wide that the embodiment of the invention provides;
The payload data with among the message that Fig. 4 provides for the embodiment of the invention converts the schematic diagram of the data of 9bit bit wide to;
The structural representation of a kind of Remote Radio Unit that Fig. 5 provides for the embodiment of the invention;
The structural representation of a kind of indoor baseband processing unit that Fig. 6 provides for the embodiment of the invention;
The structural representation of a kind of distributed base station system that Fig. 7 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of data transmission method provided by the invention, device and distributed base station system are described in detail with specific embodiment.
The data transmission method that the embodiment of the invention provides in distributed base station system, as shown in Figure 1, comprises the steps:
S101, radio frequency remote unit RRU are compressed the I/Q circuit-switched data of each antenna in application layer, and the data after will compressing generate message (the basic frame structure of OBSAI agreement regulation is message) code stream;
S102, RRU are sent to indoor baseband processing unit BBU with the message code stream that generates;
The message code stream that S103, BBU receive, the I/Q circuit-switched data after application layer extracts compression from message, I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtains each antenna respectively.
Fig. 2 is that the data flow of the data transmission method that provides of the embodiment of the invention is moved towards figure.In the RRU side, after the I/Q circuit-switched data of antenna compressed by application layer, comprise transmission control operations such as route, multiplexing and demultiplexing, summation through transport layer, data link layer is carried out processing such as framing and link synchronization, carries out encoding and decoding, string and conversion in physical layer, is sent to BBU by the optical interface between RRU and the BBU, the BBU side, through after the respective handling of physical layer, data link layer and transport layer, in the operation that application layer decompresses, reduction I/Q circuit-switched data.
In above-mentioned steps S101, RRU compresses the I/Q circuit-switched data, specifically comprises:
From first data of the individual bit bit wide of M (M is the I road of antenna and the original bit wide of Q circuit-switched data) on the I road and the Q road of each antenna correspondence, from a high position to the low level, extract the data of M/2bit successively respectively, and note the exponent data of the initial bits position that characterizes the data of extracting;
The exponent data of the M/2bit data extracted and 1bit is merged into second data of (M/2+1) individual bit bit wide;
Second data on the I road of each antenna correspondence and Q road are merged into the 3rd data of (M+2) individual bit bit wide;
The 3rd adjacent data of per two transmitting times of each antenna correspondence are merged, generate the 4th data of (2M+4) individual bit bit wide.
In above-mentioned steps S103, the data after the compression are generated the message code stream, detailed process is as follows:
The 4th data of each antenna correspondence are write respectively in the first-in first-out cell fifo corresponding with each antenna;
Sense data from each cell fifo successively;
The bit width conversion of the data of reading is become to generate the required bit wide of message;
With the payload of the data after the conversion, generate the message code stream as message.
The BBU side comprises in the processing procedure of application layer to the message code stream:
Extract the payload data of each message;
The payload data that extracts is carried out bit width conversion, convert the 4th data of 2M+4 bit bit wide to, the I/Q circuit-switched data after obtaining compressing.
Described the 4th data transaction is become the 3rd data of M+2 bit bit wide;
Described the 3rd data further are split as second data of two-way M/2+1 bit bit wide;
Extract in two-way second data highest order data respectively as exponent data,, use data 0 data of the bit of the M/2 except that described exponent data in second data to be expanded generation I road and Q circuit-switched data according to the bit of described exponent data indication.
In order to be illustrated more clearly in the processing procedure of RRU side and BBU side, describe with a concrete example below.
In this example, the antenna amount that links to each other with RRU is 8 antennas, and each antenna all comprises the I road, the Q circuit-switched data, and the initial data on I road and Q road (first data) all is the transmission rate of 16bit, 1chip (chip).I road and Q circuit-switched data to 8 antennas are carried out following processing respectively: B0～B7 takes absolute value with per 8 16bit data (for example I circuit-switched data of 8 antennas), the highest order that is about to B0～B7 all gets 0, compare these 8 16bit data then, determine the absolute value maximum one, suppose it is B5, if the Senior Three position of B5 is 0, then from a high position to the low level, 8 bit data extracts of the b12 to b5 of each 16bit data are come out, and to indicate the initial bits position of the data of being extracted with exponent data " 3 " be to begin 3 of displacements from a high position to begin to extract, and so just the data compression of per 8 16bit bit wides is the data (second data) of 9bit bit wide originally.As shown in Figure 3, what represent in the square frame on the right among Fig. 3 is the data of 8 16bit bit wides, and what represent in the square frame on the left side is the data of 8 9bit bit wides after extracting.
The I road of each the antenna correspondence that will handle through said process and the 9bit data on Q road merge, be merged into the data (the 3rd data) of 18bit bit wide, to go up former and later two data the time again and merge further, generate the data (the 4th data) of 36bit bit wide.
Top process can also use following mathematical expression to represent: suppose that K antenna all has the I road, the Q circuit-switched data, each road each M bit, the transmission rate of N chip, the data on each road are compressed the back be (M/2+1) individual bit bit wide, data can be obtained after each antenna I road and Q road merge, the data of the individual bit bit wide of 2 (M+2) can be derived as after then the front and back adjacent two data being merged into (M+2) bit bit wide.
If on the basis of the optical module of existing 4x OBSAI link bearer 10M, 4 antenna configurations, the base band data of transmission 10M, 8 antennas, so for guarantee transmission rate can with 4x OBSAI link and optical module coupling, need recomputate the payload of each message carrying.Through after the above-mentioned compression process, the base band speed of an antenna is (N/2) (2M+4)=N (M+2), and the base band speed of K antenna is
The base band data speed through 4 antennas of data compression is not K N 2M, and therefore, the data rate after K antenna compresses as can be known with the base band data speed after K the antenna compression and its contrast is a unpressed K/2 antenna base band data speed
Doubly.Accordingly, the payload of each message carrying should correspondingly be increased to i.e. 18 bytes of 16*18/16 also from 16 bytes.
With the data (the 4th data) of 36bit bit wide after the compression write the first-in first-out unit (First in First Out, FIFO) in, just the data of 8 antennas to be write respectively in 8 cell fifos accordingly.In this example, be that the FIFO of 36bit, degree of depth 2K is an example with the width.
Because the speed that data fifo reads is 8 times that write, suppose that the speed that writes is 36bit/s, the speed that reads so is 8.Read and when writing data, data cell by certain data volume reads and writes, therefore the data volume that is to say the data cell of write-once is 576*36bit, and time of writing of data unit is 576s, and the time of reading 1 data unit is: 576/8=72s.FIFO write with process of reading in, need to guarantee that each FIFO can not be read sky, can not be write spill-over again and go out.So must be accurate for the control that writes and read to FIFO.Because read the mode of each FIFO is the poll formula, after just running through a data unit from a FIFO, just can turn to next FIFO to continue to read, after the 7th FIFO reads, just can turn to from the 8th FIFO and read, correspondingly, after reading from the 8th FIFO, turn to again from the 1st FIFO and read.
It is as follows to guarantee that each FIFO is not write full controlled condition: need expend 72*7=504s because read preceding 7 FIFO, in the initial moment of reading current FIFO, the data volume that writes among the FIFO that its last time reads can not be greater than (2048-504) * 36bit=1544*36bit.
It is as follows to guarantee that each FIFO is not read empty controlled condition: read the initial moment of certain FIFO, the data of all FIFO should be in 504*36bit～1544*36bit scope.
For the configuration of 4x OBSAI link, the data in the data cell of reading from FIFO are assigned among 4 message simultaneously, as the payload of 4 message carryings.But the embodiment of the invention is not limited to 4x OBSAI link, configuration for 1x OBSAI link, 2x OBSAI link, the data allocations of reading in the message of respective numbers, for example for the configuration of 2x OBSAI link, is needed among data allocations to 2 message who reads.
The bit wide of the data of reading from 8 FIFO is 36bit, and the input data bit width that existing OBSAI protocol definition generates message is 8bit.Therefore, the data transaction of the 36bit bit wide of reading need be become the data of 8bit bit wide.
For these three kinds of configurations of OBSAI link of compatible 1x, 2x and 4x simultaneously better, in embodiments of the present invention, preferably, the bit width conversion of 36bit is become the 9bit bit wide, and then, convert the 8bit bit wide to the 9bit bit wide, in the specific implementation, can use realizations such as dual port RAM.
RRU is sent to BBU with the message code stream that generates.
The BBU side, carry out processing with RRU side contrary, BBU extracts the payload of 18 bytes of carrying among each message in the message code stream that receives, and the payload data that extracts carried out data bit width conversion, earlier the 8bit bit width conversion is become the bit wide of 9bit, utilize process that dual port RAM carries out bit width conversion as shown in Figure 4, what represent in the square frame of Fig. 4 right side is the payload data (bit wide is 8bit) of 18 bytes among each message, what represent in the square frame of left side is the data of the 9bit bit wide after the conversion, during bit width conversion, read last two data B16 and B 17 earlier, read preceding 16 data B0～B15 then, then B16 and B17 are carried out serial shift, be merged into the data that bit wide is 9bit with B0～B15.Then
And then the 9bit bit width conversion is become the data of 36bit bit wide, the 4th data format after the data of the 36bit bit wide after the conversion and RRU side pressure are contracted is identical, then the 36bit data are split as the data of two 18bit, then the data of 18bit bit wide are split as further the data of two 9bit bit wides, the highest order of continuous 8 9bit data is preserved by shift register, it is exactly the exponent data of these 8 data, according to exponent data, the data of least-significant byte are carried out the expansion of bit, at corresponding high-order and low level padding data zero, it is finally expanded to the 16bit data, the data that the BBU side decompresses are compressed preceding data with the RRU side and are compared slightly different, difference is exactly a compression loss, through evidence, the data transmission method that adopts the embodiment of the invention to provide, but to the influence of signal quality in the range of receiving of distributed base station system.
Based on same inventive concept, a kind of radio frequency remote unit RRU, a kind of indoor baseband processing unit BBU and a kind of distributed base station system also are provided in the embodiment of the invention, because the principle that these equipment and system deal with problems is similar to aforementioned a kind of data transmission method, therefore the enforcement of these equipment can repeat part and not give unnecessary details referring to the enforcement of method.
A kind of radio frequency remote unit RRU that the embodiment of the invention provides as shown in Figure 5, comprising: compression unit 501 and message generation unit 502; Wherein:
Further, above-mentioned compression unit 501, also be used for respectively extracting the data of M/2 bit successively by a high position to low level, and noting the exponent data of the initial bits position that characterizes the data of extracting from first data of M the bit bit wide on the I road of each antenna correspondence and Q road; Described M is the original bit wide of I road and Q circuit-switched data; The exponent data of the M/2bit data extracted and 1bit is merged into second data of M/2+1 bit bit wide; Second data on the I road of each antenna correspondence and Q road are merged into the 3rd data of M+2 bit bit wide; The 3rd adjacent data of per two transmitting times of each antenna correspondence are merged, generate the 4th data of 2M+4 bit bit wide.
Further, the RRU that the embodiment of the invention provides also comprises: read/write control unit 503, bit width conversion unit 504 and first-in first-out cell fifo 505; Wherein:
The read/write control unit is used for the 4th data after the compression are write the first-in first-out cell fifo corresponding with each antenna, and sense data from each cell fifo successively;
The bit width conversion unit, the bit width conversion that is used for the data of will read becomes to generate the required bit wide of message;
The message generation module also is used for the payload generation message code stream of the data after the bit width conversion as message;
Cell fifo is used for the 4th data after the store compressed.
In the RRU that the embodiment of the invention provides, the quantity of FIFO equates with the quantity of antenna, the quantity of message generation module is relevant with the OBSAI link configuration, if 4x OBSAI link, then adopt 4 message generation modules, for the OBSAI link of 1x, 2x, then the quantity of Dui Ying message generation module is 1 and 2.
A kind of indoor baseband processing unit BBU that the embodiment of the invention provides as shown in Figure 6, comprising: message extraction unit 601 and data decompression unit 602; Wherein:
Further, the RRU that the embodiment of the invention provides also comprises: bit width conversion unit 603 is used for the payload data that message extraction unit 601 extracts is converted to the 4th data of 2M+4 bit bit wide; M is the I road of antenna and the original bit wide of Q circuit-switched data;
The distributed base station system that the embodiment of the invention provides as shown in Figure 7, comprising:
Radio frequency remote unit RRU 701 is used for the I/Q circuit-switched data that receives is compressed, and the data after the compression is generated the message code stream, and the message code stream that generates is sent to indoor baseband processing unit BBU;
Indoor baseband processing unit BBU 702, the I/Q circuit-switched data of the payload data that is used for extracting message from the message code stream that RRU 701 sends after as compression, I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtained each antenna respectively.
The data transmission method that the embodiment of the invention provides, device and distributed base station system, the radio frequency remote unit RRU side is compressed the I/Q circuit-switched data of each antenna, and the data after will compressing generate the message code stream; RRU is sent to indoor baseband processing unit BBU with the message code stream that generates; BBU extracts I road and the Q circuit-switched data that the I/Q circuit-switched data after compressing decompresses and obtains each antenna from the message code stream after receiving the message code stream.The embodiment of the invention is compressed the I/Q circuit-switched data of antenna in the RRU side, transmit between RRU and the BBU be the compression after the I/Q circuit-switched data, can adopt and support the optical module of lower data transmission rate to transmit, the I/Q circuit-switched data after the BBU side is to compression decompresses.Thereby realized improving the link bearer rate not increasing cost, using on the basis of the optical module of supporting lower data transmission rate.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1. a data transmission method is characterized in that, comprising:
Radio frequency remote unit RRU is compressed the I/Q circuit-switched data of each antenna, and the data after will compressing generate message m essage code stream;
Described RRU is sent to indoor baseband processing unit BBU with the message code stream that generates;
Described BBU receives the message code stream, extracts the I/Q circuit-switched data after the compression from the message code stream, I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtains each antenna.
2. the method for claim 1 is characterized in that, RRU compresses the I/Q circuit-switched data, comprising:
From first data of M the bit bit wide on the I road of each antenna correspondence and Q road, extract M/2 bit data successively respectively by higher bit position to low bit, and the exponent data of the initial bits position of the record sign data of extracting; Described M is the I road of antenna and the original bit wide of Q circuit-switched data;
The exponent data of the M/2bit data extracted and 1bit is merged into second data of M/2+1 bit bit wide;
Second data on the I road of each antenna correspondence and Q road are merged into the 3rd data of M+2 bit bit wide;
The 3rd adjacent data of per two transmitting times of each antenna correspondence are merged, generate the 4th data of 2M+4 bit bit wide.
3. the method for claim 1 is characterized in that, the data after described will the compression generate the message code stream, comprising:
The 4th data of each antenna correspondence are write respectively in the first-in first-out cell fifo corresponding with each antenna;
Sense data from each cell fifo successively;
The bit width conversion of the data of reading is become to generate the required bit wide of message;
With the payload of the data after the conversion, generate the message code stream as message.
4. the method for claim 1 is characterized in that, extracts I/Q circuit-switched data after the compression from message, comprising:
Extract the payload data of each message;
The payload data that extracts is carried out bit width conversion, convert the 4th data of 2M+4 bit bit wide to, the I/Q circuit-switched data after obtaining compressing.
5. method as claimed in claim 4 is characterized in that, the I/Q circuit-switched data after the compression is decompressed obtains I road and Q circuit-switched data respectively, comprising:
Described the 4th data transaction is become the 3rd data of M+2 bit bit wide;
Described the 3rd data further are split as second data of two-way M/2+1 bit bit wide;
Extract in two-way second data highest order data respectively as exponent data,, use data 0 data of the bit of the M/2 except that described exponent data in second data to be expanded generation I road and Q circuit-switched data according to the bit of described exponent data indication.
6. a radio frequency remote unit RRU is characterized in that, comprising:
Compression unit is used for the I/Q circuit-switched data that receives is compressed;
Message m essage generation unit be used for the data after the compression are generated the message code stream, and the message code stream that generates is sent to indoor baseband processing unit BBU.
7. RRU as claimed in claim 6, it is characterized in that, described compression unit, also be used for respectively from first data of M the bit bit wide on the I road of each antenna correspondence and Q road, extract the data of M/2 bit successively by a high position to low level, and note the exponent data of the initial bits position that characterizes the data of extracting; Described M is the original bit wide of I road and Q circuit-switched data; The exponent data of the M/2bit data extracted and 1bit is merged into second data of M/2+1 bit bit wide; Second data on the I road of each antenna correspondence and Q road are merged into the 3rd data of M+2 bit bit wide; The 3rd adjacent data of per two transmitting times of each antenna correspondence are merged, generate the 4th data of 2M+4 bit bit wide.
8. RRU as claimed in claim 7 is characterized in that, also comprises: read/write control unit, bit width conversion unit and first-in first-out cell fifo; Wherein:
Described read/write control unit is used for the 4th data after the compression are write the first-in first-out cell fifo corresponding with each antenna, and sense data from each cell fifo successively;
Described bit width conversion unit, the bit width conversion that is used for the data of will read becomes to generate the required bit wide of message;
Described message generation module also is used for the payload generation message code stream of the data after the bit width conversion as message;
Described cell fifo is used for the 4th data after the store compressed.
9. an indoor baseband processing unit BBU is characterized in that, comprising:
Message m essage extraction unit is used for extracting the payload data of message as the I/Q circuit-switched data after compressing from the message code stream that radio frequency remote unit RRU sends;
The data decompression unit is used for I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtained each antenna respectively.
10. BBU as claimed in claim 9 is characterized in that, also comprises: the bit width conversion unit is used for the payload data that described message extraction unit extracts is converted to the 4th data of 2M+4 bit bit wide; Described M is the I road of antenna and the original bit wide of Q circuit-switched data;
Described data decompression unit also is used for the 4th data transaction is become the 3rd data of M+2 bit bit wide; The 3rd data further are split as second data of two-way M/2+1 bit bit wide, extract in two-way second data highest order data respectively as exponent data, bit according to described exponent data indication, use data 0 that the data of the bit of the M/2 except that described exponent data in second data are expanded, generate I road and Q circuit-switched data.
11. a distributed base station system is characterized in that, comprising:
Radio frequency remote unit RRU is used for the I/Q circuit-switched data that receives is compressed, and the data after the compression are generated message m essage code stream, and the message code stream that generates is sent to indoor baseband processing unit BBU;
Indoor baseband processing unit BBU, the payload data that is used for extracting message from the message code stream that RRU the sends I/Q circuit-switched data after as compression, I road and Q circuit-switched data that the I/Q circuit-switched data after the compression is decompressed and obtained each antenna respectively.
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| CN 200910223372 CN102065470B (en) | 2009-11-18 | 2009-11-18 | Data transmission method, device and distributed base station system |
| PCT/CN2010/073305 WO2010148898A1 (en) | 2009-11-18 | 2010-05-27 | Method, device and distributed base station system for transmitting data |
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| CN 200910223372 CN102065470B (en) | 2009-11-18 | 2009-11-18 | Data transmission method, device and distributed base station system |
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| WO2010148898A1 (en) | 2010-12-29 |
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