CN101754475A - Data transmission method, system and device - Google Patents
Data transmission method, system and device Download PDFInfo
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- CN101754475A CN101754475A CN200810240313A CN200810240313A CN101754475A CN 101754475 A CN101754475 A CN 101754475A CN 200810240313 A CN200810240313 A CN 200810240313A CN 200810240313 A CN200810240313 A CN 200810240313A CN 101754475 A CN101754475 A CN 101754475A
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Abstract
The invention discloses a data transmission method, a system and a device which are used to reduce the data quantity transmitted between RRU and BBU, so as to reduce the bandwidth requirement on an Ir interface. The data transmission method provided by the invention comprises that a data sending device carries out down sampling processing to a signal which needs to be sent by the Ir interface between the radio remote unit RRU and the baseband unit BBU; and the data sending device sends the signal which receives the down sampling processing to a data receiving device through the Ir interface.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of data transmission method, system and device.
Background technology
Base station equipment (NodeB) in the TD-SCDMA baseband extension system is a distributed base station equipment, as shown in Figure 1, this distributed base station equipment comprises Base Band Unit (Base Band Unit, BBU) and remote radio unit (RRU) (RRU, Remote Radio Unit), use optical fiber to connect between BBU and the RRU usually.A BBU can be connected by a pair of optical fiber with a RRU, in order to satisfy the multifarious requirement of System Expansion and network configuration, Ir interface (interface between BBU and the RRU) agreement is expanded being connected between BBU and the RRU, comprises that a plurality of RRU serve that same BBU connects with star-like connection, chain between this BBU and different connected mode such as ring-like connection.
The Ir interface protocol is supported the transmission of all valid data between BBU and the RRU, but need data quantity transmitted very huge between BBU and the RRU, with Long Term Evolution (Long Time Evolution, LTE) 20MHz bandwidth system is an example, in LTE 20MHz bandwidth system, the baseband signal sample rate is 30.72Mhz, quantization resolution is 16bit, so, the gross bit rate of up IQ signal is the air interface rate under 2 antenna situations: 30.72M*32bit*2 antenna * (10/8)=2.4576Gbps.If adopt 8 antennas to receive, required baseband transmission speed is 8 air interface rate under the antenna situation: 30.72M*32bit*8 antenna * (10/8)=9.8304Gbps.Descending sampling rate also needs same transmission rate could transmit the required data of Base-Band Processing with up identical.Therefore, need the mass data transmitted between RRU and the BBU, making must increase transmission line between RRU and the BBU, thereby has caused the implementation complexity of system and cost to increase greatly.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method, system and device, in order to reducing data quantity transmitted between RRU and the BBU, thereby has reduced the bandwidth demand of Ir interface.
A kind of data transmission method that the embodiment of the invention provides comprises:
Data sending device is to carrying out down-sampled processing by the signal that the Ir interface between remote radio unit (RRU) RRU and the Base Band Unit BBU sends;
Described data sending device will send to data sink by described Ir interface through the signal after the described down-sampled processing.
A kind of data transmission device that the embodiment of the invention provides comprises:
Down-sampled unit is used for carrying out down-sampled processing by the signal that the Ir interface between remote radio unit (RRU) RRU and the Base Band Unit BBU sends;
Wired transmitting element is used for sending by described Ir interface sending through the signal after the described down-sampled processing.
A kind of communication system that the embodiment of the invention provides comprises:
Remote radio unit (RRU) RRU, the signal that is used for needs are sent to Base Band Unit BBU carries out down-sampled processing, and will send to described BBU through the signal after the described down-sampled processing;
Base Band Unit BBU is used to receive the signal after the down-sampled processing of process that described RRU sends, and this signal is carried out Base-Band Processing.
The embodiment of the invention, by data sending device to carrying out down-sampled processing by the signal that the Ir interface between remote radio unit (RRU) RRU and the Base Band Unit BBU sends; Described data sending device will send to data sink by described Ir interface through the signal after the described down-sampled processing, make the Ir interface data quantity transmitted between BBU and RRU obviously descend, greatly reduce the bandwidth resources demand of Ir interface between BBU and the RRU, thereby also reduced difficulty and cost that system realizes.
Description of drawings
Fig. 1 is the structural representation of distributed base station equipment of the prior art;
The structural representation of a kind of communication system that Fig. 2 provides for the embodiment of the invention;
The structural representation that rises sampling unit that Fig. 3 provides for the embodiment of the invention;
Fig. 4 rises the sampling processing principle schematic for what the embodiment of the invention provided;
The schematic flow sheet of a kind of data transmission method that Fig. 5 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of data transmission method, system and device, in order to reducing data quantity transmitted between RRU and the BBU, thereby has reduced the bandwidth demand of Ir interface.
What transmit on the Ir interface in the prior art is time-domain signal, and sample rate is 30.72MHz.And for the LTE20M system, 20.48MHz sample rate promptly can satisfy the requirement of sample rate, therefore, the embodiment of the invention is carried out down-sampled to the signal that need transmit on the Ir interface, sample rate is reduced to 20.48MHz, thereby the transmission rate of Ir interface can be reduced to 2/3 of existing transmission rate, effectively reduce the bandwidth demand of Ir interface.
For receiving the device that sample rate is the signal of 20.48MHz, need carry out rising sampling processing to the received signal, the sample rate of 20.48MHz is risen to 30.72MHz.If it is the signal of 20.48MHz that RRU receives the sample rate of BBU transmission, then RRU need carry out rising sampling processing to this signal, and obtaining sample rate is the 30.72MHz signal, and sends by wireless mode.If it is the signal of 20.48MHz that BBU receives the sample rate of RRU transmission, then BBU need carry out rising sampling processing to this signal, obtaining sample rate is the 30.72MHz signal, and this signal carried out carrying out down-sampled processing after the Base-Band Processing, obtain the baseband signal of 20.48MHz, the baseband signal with this 20.48MHz returns to RRU then.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
Referring to Fig. 2, a kind of communication system that the embodiment of the invention provides comprises:
Remote radio unit (RRU) RRU 21, the signal that is used for needs are sent to Base Band Unit BBU 22 carries out down-sampled processing, and will send to described BBU 22 through the signal after the down-sampled processing.
Base Band Unit BBU 22 is used to receive the signal after the down-sampled processing of process that described RRU 21 sends, and this signal is carried out Base-Band Processing.
Described RRU 21 comprises:
Down-sampled unit 213 is used for according to the sample rate of 20.48MHz described baseband signal being carried out down-sampled processing, obtains the baseband signal that sample rate is 20.48MHz.
Wired transmitting element 214, being used for described sample rate is that the baseband signal of 20.48MHz sends to described BBU 22.
Described BBU 22 comprises:
Wired receiving element 221 is used to receive the signal through after the described RRU 21 down-sampled processing.
Baseband signal processing unit 223, being used for this sample rate is that the signal of 30.72MHz carries out Base-Band Processing.
Described BBU 22 also comprises:
Down-sampled unit 224 is used for according to the sample rate of 20.48MHz the baseband signal after handling through described baseband signal processing unit 223 being carried out down-sampled processing, obtains the baseband signal that sample rate is 20.48MHz.
Wired transmitting element 225, being used for this sample rate is that the baseband signal of 20.48MHz sends to described RRU 21.
Described RRU 21 also comprises:
Wired receiving element 215 is used to receive the signal through after the described BBU 22 down-sampled processing.
Referring to Fig. 3, above-mentioned rise sampling unit 222 or rise sampling unit 216 comprise:
Need to prove, the sample rate of the sample rate of 30.72MHz described in the embodiment of the invention, the sample rate of 61.44MHz and 20.48MHz only is a kind of illustrating, and being not limited to this several sample rates, other sample rates can be suitable for the technical scheme that the embodiment of the invention provides equally.
Described first processing unit 31 comprises:
Resolving cell 311, the signal that is used for self is received decomposes, and obtains a plurality of numerical chracters.Wherein, the signal that receives is a sequence, and this sequence comprises a plurality of numerical chracters, and resolving cell 311 is responsible for extracting each numerical chracter from the sequence that receives.
Preferably, parallel processing element 312 adopts impulse function, for example sinc function.The above-mentioned operation principle that rises sampling unit 222 or rise sampling unit 216 as shown in Figure 4, wherein, each numerical chracter walked abreast, and to rise each sinc function that sampling processing adopts identical.
Described sinc function with sinc (x) expression, is divided into normalization sinc function and non-normalized sinc function, and they all are the products of SIN function and monotonic decreasing function 1/x,
Normalization sinc function is:
Non-normalized sinc function is:
Non-normalized sinc function is equal to normalization sinc function, does not just have amplification coefficient ∏ in its variable, adopts normalization sinc function usually in the communications field.
For LTE 20M system, 20.48MHz sample rate just can satisfy the requirement of sample rate, therefore Ir interface transmission rate can be reduced to 2/3 of existing speed, situation for 8 antennas, need the optical fiber of 6.5G to transmit, but the requirement of the through engineering approaches index 6.144G that can reach with the present stage optical communication is compared still slightly height a bit, if the transmitted bit of Ir interface is reduced to 15 bits, the transmission rate of Ir interface is 6.144G just.If adopt 1/16 bandwidth to be used for command transmitting, the transmission rate of user data is 5.7344G so, uses the transmitted bit of 14 bits to finish the transformation task of user data like this.
Referring to Fig. 5, a kind of data transmission method that the embodiment of the invention provides comprises:
S501, data sending device will send to data sink by the Ir interface through the signal after the down-sampled processing to carrying out down-sampled processing by the signal that the Ir interface between RRU and the BBU sends.
S502, data sink receive through behind the signal after the down-sampled processing of data sending device, and this signal is carried out rising sampling processing.
Wherein, described data sending device is RRU, and described data sink is BBU; Perhaps, described data sending device is BBU, and described data sink is RRU.
Described data sending device carries out down-sampled processing according to the first default sample rate to described baseband signal.
Further, this method also comprises:
Described data sink carries out rising sampling processing to this signal after receiving signal after the down-sampled processing.Particularly, comprising:
Step 1: data sink carries out rising sampling processing according to the signal of the second default sample rate after to down-sampled processing, and obtaining sample rate is the signal of the second default sample rate.
Step 2: data sink is that second signal of presetting sample rate carries out down-sampled processing according to the sample rate of the 3rd default sample rate to sample rate, and obtaining sample rate is the signal of the 3rd default sample rate;
Wherein, the described second default sample rate is greater than the described the 3rd default sample rate, and the described the 3rd default sample rate is greater than the described first default sample rate.
Particularly, described step 1 comprises:
The signal of data sink after to described down-sampled processing decomposes, and obtains a plurality of numerical chracters;
Data sink carries out rising sampling processing according to the sample rate of the second default sample rate simultaneously to a plurality of numerical chracters;
Data sink will be formed the signal that sample rate is the second default sample rate through the numerical chracter that rises sampling processing.
Preferably, the described first default sample rate is 20.48MHz, and the described second default sample rate is 61.44MHz, and the described the 3rd default sample rate is 30.72MHz.
In sum, after the signal that the embodiment of the invention sends needs by data sending device (RRU or BBU) carries out down-sampled processing, send to data sink (RRU or BBU) by the Ir interface between RRU and the BBU, make the Ir interface data quantity transmitted between BBU and RRU obviously descend, greatly reduce the bandwidth resources demand of Ir interface between BBU and the RRU, thereby also reduced difficulty and cost that system realizes.
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 (17)
1. a data transmission method is characterized in that, this method comprises:
Data sending device is to carrying out down-sampled processing by the signal that the Ir interface between remote radio unit (RRU) RRU and the Base Band Unit BBU sends;
Described data sending device will send to data sink by described lr interface through the signal after the described down-sampled processing.
2. method according to claim 1 is characterized in that, this method also comprises:
Described data sink carries out rising sampling processing to this signal after receiving signal after the described down-sampled processing.
3. method according to claim 2 is characterized in that, described data sending device is preset sample rate to carrying out down-sampled processing by the signal that described Ir interface sends according to first;
The step that the signal of described data sink after to described down-sampled processing carries out rising sampling processing comprises:
Described data sink carries out rising sampling processing according to the signal of the second default sample rate after to described down-sampled processing, and obtaining sample rate is the signal of the second default sample rate;
Described data sink is that second signal of presetting sample rate carries out down-sampled processing according to the sample rate of the 3rd default sample rate to described sample rate, and obtaining sample rate is the signal of the 3rd default sample rate;
Wherein, the described second default sample rate is greater than the described the 3rd default sample rate, and the described the 3rd default sample rate is greater than the described first default sample rate.
4. method according to claim 3 is characterized in that, described data sink carries out rising sampling processing according to the signal of the second default sample rate after to described down-sampled processing, and the step that obtains sample rate and be the signal of the second default sample rate comprises:
The signal of described data sink after to described down-sampled processing decomposes, and obtains a plurality of numerical chracters;
Described data sink carries out rising sampling processing according to the second default sample rate simultaneously to described a plurality of numerical chracters;
Described data sink will be formed the signal that sample rate is the second default sample rate through the described numerical chracter that rises sampling processing.
5. method according to claim 4 is characterized in that, described data sink utilizes impulse function that described numerical chracter is carried out rising sampling processing.
6. according to claim 3,4 or 5 described methods, it is characterized in that the described first default sample rate is 20.48MHz, the described second default sample rate is 61.44MHz, and the described the 3rd default sample rate is 30.72MHZ.
7. a data transmission device is characterized in that, this device comprises:
Down-sampled unit is used for carrying out down-sampled processing by the signal that the Ir interface between remote radio unit (RRU) RRU and the Base Band Unit BBU sends;
Wired transmitting element is used for sending by described Ir interface sending through the signal after the described down-sampled processing.
8. device according to claim 7 is characterized in that, this device also comprises:
Wired receiving element is used for receiving through the signal after the down-sampled processing by described Ir interface;
Rise sampling unit, be used for the signal that described wired receiving element receives is carried out rising sampling processing.
9. device according to claim 8 is characterized in that, sample rate is preset to carrying out down-sampled processing by the signal that described Ir interface sends according to first in described down-sampled unit;
The described sampling unit that rises comprises:
First processing unit is used for according to the sample rate of the second default sample rate signal that described wired receiving element receives being carried out rising sampling processing, and obtaining sample rate is the signal of the second default sample rate;
Second processing unit, being used for according to the 3rd default sample rate is that second signal of presetting sample rate carries out down-sampled processing to described sample rate, obtaining sample rate is the signal of the 3rd default sample rate;
Wherein, the described second default sample rate is greater than the described the 3rd default sample rate, and the described the 3rd default sample rate is greater than the described first default sample rate.
10. device according to claim 9 is characterized in that, described first processing unit comprises:
Resolving cell is used for the signal after the described down-sampled processing is decomposed, and obtains a plurality of numerical chracters;
Parallel processing element is used for according to the second default sample rate described a plurality of numerical chracters being carried out rising sampling processing simultaneously;
Sum unit is used for and will forms the signal that sample rate is the second default sample rate through the described numerical chracter that rises sampling processing.
11. device according to claim 9 is characterized in that, the described first default sample rate is 20.48MHz, and the described second default sample rate is 61.44MHz, and the described the 3rd default sample rate is 30.72MHz.
12., it is characterized in that this device is RRU or BBU according to the described device of the arbitrary claim of claim 7 to 11.
13. a communication system is characterized in that, this system comprises:
Remote radio unit (RRU) RRU, the signal that is used for needs are sent to Base Band Unit BBU carries out down-sampled processing, and will send to described BBU through the signal after the described down-sampled processing;
Base Band Unit BBU is used to receive the signal after the down-sampled processing of process that described RRU sends, and this signal is carried out Base-Band Processing.
14. system according to claim 13 is characterized in that, described RRU comprises:
RF processing unit, the radiofrequency signal that is used for receiving is converted to intermediate-freuqncy signal;
IF processing unit is used for described intermediate-freuqncy signal is converted to baseband signal;
Down-sampled unit is used for according to the first default sample rate described baseband signal being carried out down-sampled processing, and obtaining sample rate is the baseband signal of the first default sample rate;
Wired transmitting element, being used for described sample rate is that first baseband signal of presetting sample rate sends to described BBU.
15. system according to claim 14 is characterized in that, described BBU comprises:
Wired receiving element is used to receive the signal through after the down-sampled processing of described RRU;
Rise sampling unit, being used for carrying out rising sampling processing through the signal after the down-sampled processing of described RRU, obtaining sample rate is the signal of the 3rd default sample rate;
Baseband signal processing unit, being used for described sample rate is that the 3rd signal of presetting sample rate carries out Base-Band Processing;
Wherein, the described the 3rd default sample rate is greater than the described first default sample rate.
16. system according to claim 15 is characterized in that, described BBU also comprises:
Down-sampled unit is used for according to the first default sample rate baseband signal after handling through described baseband signal processing unit being carried out down-sampled processing, and obtaining sample rate is the baseband signal of the first default sample rate;
Wired transmitting element, being used for this sample rate is that first baseband signal of presetting sample rate sends to described RRU.
17. system according to claim 16 is characterized in that, described RRU also comprises:
Receiving element is used to receive the signal through after the down-sampled processing of described BBU;
Rise sampling unit, being used for carrying out rising sampling processing through the signal after the down-sampled processing of described BBU, obtaining sample rate is the signal of the 3rd default sample rate;
The wireless transmission unit, being used for this sample rate is that the 3rd signal of presetting sample rate sends by wireless mode.
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| CN200810240313A CN101754475A (en) | 2008-12-17 | 2008-12-17 | Data transmission method, system and device |
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| CN200810240313A CN101754475A (en) | 2008-12-17 | 2008-12-17 | Data transmission method, system and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821069A (en) * | 2011-06-07 | 2012-12-12 | 中兴通讯股份有限公司 | Base station and uplink data compression method on base station side |
| CN102833000A (en) * | 2012-08-14 | 2012-12-19 | 电信科学技术研究院 | Method and equipment for data transmission |
| CN102938839A (en) * | 2012-11-13 | 2013-02-20 | 浙江宇视科技有限公司 | Monitoring front-end equipment and encoding server |
| WO2014056306A1 (en) * | 2012-10-12 | 2014-04-17 | 华为技术有限公司 | Bbu, rru and data transmission method and wireless access system therefor |
| CN104378848A (en) * | 2013-08-16 | 2015-02-25 | 普天信息技术研究院有限公司 | Distributed base station |
| CN106506411A (en) * | 2015-09-07 | 2017-03-15 | 普天信息技术有限公司 | Uplink data transmission method and base station |
-
2008
- 2008-12-17 CN CN200810240313A patent/CN101754475A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102821069A (en) * | 2011-06-07 | 2012-12-12 | 中兴通讯股份有限公司 | Base station and uplink data compression method on base station side |
| CN102821069B (en) * | 2011-06-07 | 2018-06-08 | 中兴通讯股份有限公司 | Base station and uplink data compression method on base station side |
| CN102833000A (en) * | 2012-08-14 | 2012-12-19 | 电信科学技术研究院 | Method and equipment for data transmission |
| CN102833000B (en) * | 2012-08-14 | 2015-06-17 | 电信科学技术研究院 | Method and equipment for data transmission |
| WO2014056306A1 (en) * | 2012-10-12 | 2014-04-17 | 华为技术有限公司 | Bbu, rru and data transmission method and wireless access system therefor |
| CN102938839A (en) * | 2012-11-13 | 2013-02-20 | 浙江宇视科技有限公司 | Monitoring front-end equipment and encoding server |
| CN104378848A (en) * | 2013-08-16 | 2015-02-25 | 普天信息技术研究院有限公司 | Distributed base station |
| CN104378848B (en) * | 2013-08-16 | 2018-08-10 | 普天信息技术研究院有限公司 | A kind of distributed base station |
| CN106506411A (en) * | 2015-09-07 | 2017-03-15 | 普天信息技术有限公司 | Uplink data transmission method and base station |
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