CN104144529A - Far-end radio frequency unit, base band unit and distributed base station - Google Patents
Far-end radio frequency unit, base band unit and distributed base station Download PDFInfo
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- CN104144529A CN104144529A CN201310173242.6A CN201310173242A CN104144529A CN 104144529 A CN104144529 A CN 104144529A CN 201310173242 A CN201310173242 A CN 201310173242A CN 104144529 A CN104144529 A CN 104144529A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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Abstract
The invention discloses a far-end radio frequency unit, a base band unit and a distributed base station. Data interaction is achieved between the far-end radio frequency unit and the base band unit on the basis of a packet switching technology. The far-end radio frequency unit comprises a first encapsulation unit, a first sending unit, a first receiving unit and a first decapsulation unit, wherein the first encapsulation unit is used for encapsulating and processing first data to be sent to the base band unit on the basis of the packet switching technology, and a first data package is obtained; the first sending unit is used for sending the first data package to a target base band unit on the basis of the packet switching technology, and the first data package is decapsulated through the target base band unit to obtain first data; the first receiving unit is used for receiving a second data package which is encapsulated and sent by the base band unit on the basis of the packet switching technology; the first decapsulation unit is used for decapsulating the second data package to obtain second data. By means of the far-end radio frequency unit, flexibility of the distributed base station is improved.
Description
Technical field
The present invention relates to mobile communication technology field, particularly a kind of remote radio unit (RRU), Base Band Unit and distributed base station.
Background technology
Compared with early stage integrated base station, distributed base station is divided into two parts: Base Band Unit (Base Band Unit, BBU) and remote radio unit (RRU) (Radio Remote Unit, RRU), wherein BBU is placed in machine room conventionally, is connected with the RRU that is positioned at antenna proximal end by optical fiber.Adopting CPRI(Common Public Radio Interface, common public radio interface before BBU and RRU) agreement communicates.
The functional block diagram of BBU and RRU as shown in Figure 1, wherein, mainly completes the signal processing that communication protocol stack is relevant in BBU, comprise physical layer, MAC layer and above high-rise processing unit.In RRU, mainly comprise digital intermediate frequency, transceiver unit, power amplifier and duplex/circulator.RRU, in down link, mainly completes and separates CPRI interface data, Digital IF Processing and radio frequency processing etc.RRU, in up link, mainly completes radio frequency processing, data intermediate frequency process and generates CPRI interface data.
This distributed frame has the advantages such as flexible configuration, engineering construction is convenient, environmental suitability is strong, has been widely used in the construction of 3G wireless network.But there is the inflexible problem of application causing due to CPRI agreement in existing BBU and RRU.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of remote radio unit (RRU), Base Band Unit and distributed base station, improves the flexibility of distributed base station application.
To achieve these goals, the embodiment of the present invention provides a kind of remote radio unit (RRU), and described remote radio unit (RRU) carries out data interaction based on packet technology and Base Band Unit, and described remote radio unit (RRU) comprises:
The first encapsulation unit, for based on packet technology, the first data that are sent to described Base Band Unit being carried out to encapsulation process, obtains the first packet;
The first transmitting element, for based on packet technology, described the first Packet Generation being arrived to target Base Band Unit, obtains described the first data by target Base Band Unit by the first packet described in decapsulation;
The first receiving element, the second packet that encapsulates and send based on packet technology for receiving described Base Band Unit;
The first decapsulation unit, for the second packet described in decapsulation, obtains described the second data.
Above-mentioned remote radio unit (RRU), wherein, described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, between described remote radio unit (RRU) and Base Band Unit, be connected with a switching equipment, described the first transmitting element is specifically for arriving described switching equipment by described the first Packet Generation, make described switching equipment according to the first object information of carrying in the first packet, described the first Packet Generation to be arrived to described target Base Band Unit corresponding to described first object information;
The second packet that the first receiving element sends specifically for receive described Base Band Unit by described switching equipment, carries the second target information of determining target remote radio unit (RRU) for described switching equipment in described the second packet.
Above-mentioned remote radio unit (RRU), wherein, described remote radio unit (RRU) also comprises the RF processing unit, Digital IF Processing unit and the fast Fourier transform unit that are linked in sequence, and wherein, described the first data are the up frequency domain data of described fast Fourier transform unit output.
Above-mentioned remote radio unit (RRU), wherein, described remote radio unit (RRU) also comprises the RF processing unit, Digital IF Processing unit, fast Fourier transform unit and the screening unit that are linked in sequence, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select data that the current Resource Block being scheduled for is corresponding as described the first data, be transferred to described the first encapsulation unit.
Above-mentioned remote radio unit (RRU), wherein, remote radio unit (RRU) also comprises the RF processing unit, Digital IF Processing unit, fast Fourier transform unit, screening unit and the compression unit that are linked in sequence, screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select transfer of data that the current Resource Block being scheduled for is corresponding to compression unit, compression unit is for compressing processing to the data that receive, and using the data after compression as the first data, be transferred to the first encapsulation unit.
Above-mentioned remote radio unit (RRU), wherein, described remote radio unit (RRU) is connected with multiple Base Band Unit by described switching equipment, described the first encapsulation unit is specifically for according to Base Band Unit cooperative information, described the first data are carried out to encapsulation process, obtain carrying multiple first packets of different first object information;
Different first object information is corresponding to different cooperation Base Band Unit.
Above-mentioned remote radio unit (RRU), wherein, described remote radio unit (RRU) is arranged in a remote radio unit (RRU) pond being made up of multiple remote radio unit (RRU)s, and described remote radio unit (RRU) also comprises:
The first IWU, for according to remote radio unit (RRU) cooperative information, and other cooperation remote radio unit (RRU)s cooperations, realize multipoint cooperative and send.
To achieve these goals, the embodiment of the present invention also provides a kind of Base Band Unit, and described Base Band Unit carries out data interaction based on packet technology and remote radio unit (RRU), and described Base Band Unit comprises:
The second receiving element, the first packet sending for receive described remote radio unit (RRU) based on packet technology;
The second decapsulation unit, for the first packet described in decapsulation, obtains described the first data;
The second encapsulation unit, for the second data that are sent to described remote radio unit (RRU) are carried out to encapsulation process, obtains the second packet;
The second transmitting element, for based on packet technology, described the second Packet Generation being arrived to target remote radio unit (RRU), obtains described the first data by target remote radio unit (RRU) by the first packet described in decapsulation.
Above-mentioned Base Band Unit, wherein,
Described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, between described remote radio unit (RRU) and Base Band Unit, be connected with a switching equipment, described the second transmitting element is specifically for arriving described switching equipment by described the second Packet Generation, make described switching equipment according to second target information of carrying in the second packet, described the second Packet Generation to be arrived to described target remote radio unit (RRU) corresponding to described the second target information;
The first packet that described the second receiving element sends specifically for receive described remote radio unit (RRU) by described switching equipment, carries the first object information of determining target Base Band Unit for described switching equipment in described the first packet.
Above-mentioned Base Band Unit, wherein, described remote radio unit (RRU) comprises the RF processing unit, Digital IF Processing unit and the fast Fourier transform unit that are linked in sequence, and wherein, described the first data are the up frequency domain data of described fast Fourier transform unit output.
Above-mentioned Base Band Unit, wherein, described remote radio unit (RRU) comprises the RF processing unit, Digital IF Processing unit, fast Fourier transform unit and the screening unit that are linked in sequence, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select data corresponding to the current Resource Block being scheduled for, described the first data are the data of described screening unit output.
Above-mentioned Base Band Unit, wherein, described remote radio unit (RRU) comprises the RF processing unit, Digital IF Processing unit, fast Fourier transform unit, screening unit and the compression unit that are linked in sequence, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select transfer of data that the current Resource Block being scheduled for is corresponding to described compression unit, described compression unit is for the data that receive are compressed to processing, and described the first data are the data of described compression unit output;
Described Base Band Unit also comprises:
Decompression unit, for decompressing to the first data of described the second decapsulation unit output.
Above-mentioned Base Band Unit, wherein, described Base Band Unit is arranged in a Base Band Unit pond being made up of multiple Base Band Unit, and described Base Band Unit also comprises:
The second IWU, for according to Base Band Unit cooperative information, and other cooperation Base Band Unit cooperations, realize multipoint cooperative and receive.
Above-mentioned Base Band Unit, wherein, described Base Band Unit is connected with multiple remote radio unit (RRU)s by described switching equipment, described the second encapsulation unit is specifically for according to remote radio unit (RRU) cooperative information, described the second data are carried out to encapsulation process, obtain carrying multiple second packets of the second different target informations;
The second different target informations is corresponding to different cooperation remote radio unit (RRU)s.
To achieve these goals, the embodiment of the present invention provides a kind of distributed base station, comprises above-mentioned remote radio unit (RRU) arbitrarily and Base Band Unit.
The embodiment of the present invention has at least one in following beneficial effect:
In the embodiment of the present invention, between BBU and RRU, realize transfer of data (encapsulation unit and the decapsulation unit that wherein arrange are not shown in the drawings) by general packet network, instead of transmit based on CPRI, this has increased flexibility mutual between BBU and RRU greatly;
In the embodiment of the present invention, can repartition the function of BBU and RRU, the FFT/IFFT function being originally arranged in BBU in prior art is moved on to RRU, reduce the volume of transmitted data between BBU and RRU;
In the embodiment of the present invention, the FFT/IFFT function in BBU is moved on to after RRU, can in RRU, carry out screening in advance to upstream data, up frequency domain data corresponding to RB that those are not dispatched to deleted, and further reduces the data of RRU to BBU transmission;
In the embodiment of the present invention, in the time that load of base station is heavier, the data volume of screening output just increases thereupon.Therefore can also compression and decompression be set at BBU and RRU correspondence, further reduce the volume of transmitted data between BBU and RRU.
Brief description of the drawings
Fig. 1 represents the functional block diagram of existing BBU and RRU;
Fig. 2 represents the structural representation of the distributed base station of the embodiment of the present invention;
Fig. 3 represents the structural representation that the distributed base station of the embodiment of the present invention is described from another aspect;
Fig. 4 represents that the distributed base station of the embodiment of the present invention carries out the schematic flow sheet of data screening;
Fig. 5 represents that the distributed base station of the embodiment of the present invention carries out the schematic flow sheet of cooperative reception.
Embodiment
In remote radio unit (RRU), Base Band Unit and the distributed base station of the embodiment of the present invention, remote radio unit (RRU) and Base Band Unit carry out transfer of data based on packet technology, have improved the flexibility of distributed base station application.
Packet technology also claims packet-switch technology, and its data that user is transmitted are divided into certain length, and each part is called a grouping.Each grouping above add a packets headers to mail to what address in order to indicate this grouping, then by switch according to the address mark of each grouping, they are forwarded to destination.
And under existing BBU and RRU framework, no matter in busy or idle, due to the particularity of CPRI agreement, between BBU and RRU, there is two-way transfer of data in the moment, and the data volume of transmitting between BBU and RRU can not reduce because traffic carrying capacity is little.
And packet technology can be divided into data to be transmitted multiple groupings, each grouping sends to different destinations, simultaneously when packet technology can also build the packet of quantity according to the data volume size of band transmission data, and therefore remote radio unit (RRU) and Base Band Unit carry out transfer of data and can improve the flexibility of distributed base station application based on packet technology.
To be elaborated below.
The embodiment of the present invention provides a kind of remote radio unit (RRU), and described remote radio unit (RRU) carries out data interaction based on packet technology and Base Band Unit, and described remote radio unit (RRU) comprises:
The first encapsulation unit, for based on packet technology, the first data that are sent to described Base Band Unit being carried out to encapsulation process, obtains the first packet;
The first transmitting element, for based on packet technology, described the first Packet Generation being arrived to target Base Band Unit, obtains described the first data by target Base Band Unit by the first packet described in decapsulation;
The first receiving element, the second packet that encapsulates and send based on packet technology for receiving described Base Band Unit;
The first decapsulation unit, for the second packet described in decapsulation, obtains described the second data.
In the specific embodiment of the invention, when described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, between described remote radio unit (RRU) and Base Band Unit, be connected with a switching equipment, described the first transmitting element is specifically for arriving described switching equipment by described the first Packet Generation, make described switching equipment according to the first object information of carrying in the first packet, described the first Packet Generation to be arrived to described target Base Band Unit corresponding to described first object information;
And the second packet that the first receiving element sends specifically for receive described Base Band Unit by described switching equipment carries the second target information of determining target remote radio unit (RRU) for described switching equipment in described the second packet.
The embodiment of the present invention provides a kind of Base Band Unit, and described Base Band Unit carries out data interaction based on packet technology and remote radio unit (RRU), corresponding with remote radio unit (RRU), and described Base Band Unit comprises:
The second receiving element, the first packet sending for receive described remote radio unit (RRU) based on packet technology;
The second decapsulation unit, for the first packet described in decapsulation, obtains described the first data;
The second encapsulation unit, for the second data that are sent to described remote radio unit (RRU) are carried out to encapsulation process, obtains the second packet;
The second transmitting element, for based on packet technology, described the second Packet Generation being arrived to target remote radio unit (RRU), obtains described the first data by target remote radio unit (RRU) by the first packet described in decapsulation.
In the specific embodiment of the invention, when described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, between described remote radio unit (RRU) and Base Band Unit, be connected with a switching equipment, described the second transmitting element is specifically for arriving described switching equipment by described the second Packet Generation, make described switching equipment according to second target information of carrying in the second packet, described the second Packet Generation to be arrived to described target remote radio unit (RRU) corresponding to described the second target information;
The first packet that described the second receiving element sends specifically for receive described remote radio unit (RRU) by described switching equipment, carries the first object information of determining target Base Band Unit for described switching equipment in described the first packet.
The remote radio unit (RRU) of the embodiment of the present invention can be that mode is connected one to one with Base Band Unit, in this case, between the two, can directly connect, and the remote radio unit (RRU) of the embodiment of the present invention also can be realized being connected of one-to-many with Base Band Unit, when described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, the distributed base station of the embodiment of the present invention as shown in Figure 2, comprise remote radio unit (RRU) and Base Band Unit, and remote radio unit (RRU) is connected by the switching equipment of realizing based on packet technology with Base Band Unit, described remote radio unit (RRU) comprises:
The first encapsulation unit, for the first data that are sent to described Base Band Unit are carried out to encapsulation process, obtains the first packet;
The first transmitting element, for described the first Packet Generation is arrived to described switching equipment, make the described switching equipment can be according to the first object information of carrying in the first packet, described the first Packet Generation, to target Base Band Unit corresponding to described first object information, is obtained to described the first data by target Base Band Unit by the first packet described in decapsulation;
The first receiving element, the second packet sending for receive described Base Band Unit by described switching equipment, carries the second target information of determining target remote radio unit (RRU) for described switching equipment in described the second packet;
The first decapsulation unit, for the second packet described in decapsulation, obtains described the second data.
And correspondence comprises in Base Band Unit:
The second receiving element, the first packet sending for receive described remote radio unit (RRU) by described switching equipment; In described the first packet, carry the second target information of determining target Base Band Unit for described switching equipment;
The second decapsulation unit, for the first packet described in decapsulation, obtains described the first data;
The second encapsulation unit, for the second data that are sent to described remote radio unit (RRU) are carried out to encapsulation process, obtains the second packet;
The second transmitting element, for described the second Packet Generation is arrived to described switching equipment, make the described switching equipment can be according to second target information of carrying in the second packet, described the second Packet Generation, to target remote radio unit (RRU) corresponding to described the second target information, is obtained to described the first data by target remote radio unit (RRU) by the first packet described in decapsulation.
In remote radio unit (RRU), Base Band Unit and the distributed base station of the embodiment of the present invention, remote radio unit (RRU) and Base Band Unit carry out transfer of data based on packet technology, due to the flexibility of packet technology, the remote radio unit (RRU) of the embodiment of the present invention that is and Base Band Unit can realize multipoint cooperative, can be corresponding according to how many transmission of traffic carrying capacity data, therefore improved the flexibility of distributed base station application.
In the specific embodiment of the invention, remote radio unit (RRU) and Base Band Unit carry out transfer of data by packet network, and packet network can be the packet network forming based on Ethernet Ethernet, InfiniBand etc.
InfiniBand(is called for short IB) be a kind of I/O wideband structural, can improve the communication speed between the each equipment of server, between network subsystem, for computer system improves the more broadband service of high-performance and infinite expanding.
General packet switch has good opening, and each manufacturer no longer needs to develop separately CPRI FPGA program, can save corresponding exploitation and hardware resource.General packet switch also makes easily to realize and interconnecting between different equipment, is conducive to the fast development of industry.
In specific embodiments of the invention, distributed base station is divided into two parts, and the summation of this two-part function should be identical with integral type base station.
In prior art, what between BBU and RRU, transmit is IQ data, and the data volume of IQ data is very large, is described as follows.
If adopt existing CPRI interface, the required IQ transmission bandwidth of various different communication protocol is as shown in the table:
| Communication protocol | Specification | IQ transmission bandwidth |
| GSM | 40*200KHz?TRX | 1.2G |
| TD-SCDMA | 15*1.6MHz contained fan | 6G |
| LTE | 1*20MHz, 8 antennas | 9.8G |
Can find from above, the passback of 10G optical fiber is used for carrying pure GSM station capacity can reach approximately 360 carrier frequency, and pure TD-SCDMA station capacity is for being less than 30 1.6M contained fans.And for the LTE station of 8 antenna 20MHz, the passback of 10G optical fiber only can be carried 1 carrier wave.
Therefore, in order to reduce the volume of transmitted data between BBU and RRU, in specific embodiments of the invention, the function of RRU and BBU is carried out to division again, the function of part physical layer is transferred in RRU and realized, in specific embodiments of the invention, the down-sampled function setting of the FFT/IFFT in physical layer and PRACH can be realized in RRU.
In this case, described remote radio unit (RRU) also comprises the RF processing unit, Digital IF Processing unit and the fast Fourier transform unit that are linked in sequence, and the first data that the first encapsulation unit encapsulates are the up frequency domain data of described fast Fourier transform unit output.
Taking the LTE system of 8 antenna 20MHz as example, under 20MHz, systematic sampling rate is [(2048+160) * 2+(2048+14) * 14] * 1000=30.72Mbps; Each 16 bit quantizations of I/Q data.In existing BBU+RRU system, I/Q data need adopt 8/10 coding.Data transfer bandwidth between RRU and BBU is 30.72Mbps*32*(10/8 so) * 8=9.8304Gbps.
Utilize the scheme of the embodiment of the present invention, only by the down-sampled function setting of FFT/IFFT and PRACH to after realizing in RRU, transmission bandwidth just can be reduced into 1200*14*32*8*1000=4.3008Gbps, has reduced the transmitted data amount between BBU and RRU.
But in order further to reduce the transmitted data amount between BBU and RRU, the embodiment of the present invention is further screened the up frequency domain data of fast Fourier transform unit output, in the situation that not affecting communication function realization, those hashes is deleted.
After fast Fourier transform unit is arranged to remote radio unit (RRU), can obtain up frequency domain data in remote radio unit (RRU) one end, now, each Resource Block (Resource Block, RB) is corresponding to the up frequency domain data of a part.
Generally speaking, resource outfit all can be carried out according to peak volume in a lot of base stations, that is to say, most in the situation that, a lot of RB does not have actual use, or to saving your breath in communication idle periods, a lot of RB does not have actual use.
Therefore, in specific embodiments of the invention, described remote radio unit (RRU) can also arrange a screening unit, after it is connected in fast Fourier transform unit, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select data that the current Resource Block being scheduled for is corresponding as described the first data, be transferred to described the first encapsulation unit.
Due to the setting of screening unit, now, up frequency domain data corresponding to Resource Block not being scheduled for is selected, and therefore, the data volume of the first encapsulation unit encapsulation has just reduced, and has further reduced the transmitted data amount between BBU and RRU.
And simultaneously, deletion be up frequency domain data corresponding to Resource Block not being scheduled for, reality is invalid data to BBU, even if being transferred to BBU finally also can be dropped, therefore can't affect normal communication.
Above-mentioned scheme, although add screening unit, may be in the busy stage of communication, because most RB is used, the data of therefore deleting are limited.
In this case, in order further to have reduced the transmitted data amount between BBU and RRU, in specific embodiments of the invention, a compression unit can also be set, the up frequency domain data of being exported from fast Fourier transform unit according to schedule information by described screening unit, select transfer of data that the current Resource Block being scheduled for is corresponding to described compression unit, and then utilize compression unit to compress processing to the data that receive, and using the data after compression as described the first data, be transferred to described the first encapsulation unit.
Described Base Band Unit is comprising of correspondence: decompression unit, and for the first data of described the second decapsulation unit output are decompressed.
Like this, process by compression, further reduced the uplink transmission data amount between BBU and RRU.
And specifically adopt which kind of compress technique to select as required, at this, concrete compress technique and compression process are not described in detail.
Corresponding, compression unit also can be set in BBU one end, for compressing, reduce the downlink transmission data amount between BBU and RRU before encapsulation.
In specific embodiments of the invention, owing to adopting packet technology, therefore can realize the interconnection and interflow between RRU and BBU, realize cooperation sending and receiving, be respectively described below.
< cooperative reception >
In the specific embodiment of the invention, described remote radio unit (RRU) is connected with multiple Base Band Unit by described switching equipment, described the first encapsulation unit is specifically for according to Base Band Unit cooperative information, described the first data are carried out to encapsulation process, obtain carrying multiple first packets of different first object information;
Different first object information is corresponding to different cooperation Base Band Unit.
And described Base Band Unit is arranged in a Base Band Unit pond being made up of multiple Base Band Unit, described Base Band Unit also comprises:
The second IWU, for according to Base Band Unit cooperative information, and other cooperation Base Band Unit cooperations, realize multipoint cooperative and receive.
This is described as follows for example.
Suppose the current Base Band Unit pond that has, comprising 5 Base Band Unit, be respectively A, B, C, D and E, it is cooperation jointly under current communication conditions.
Now, by one of them Base Band Unit, notify remote radio unit (RRU) X, the Base Band Unit of cooperation is A, B, C and D at present.
Now remote radio unit (RRU) X is receiving after upstream data, be encapsulated as 100 packets, because remote radio unit (RRU) X knows that now A, B, C and D cooperate mutually, now remote radio unit (RRU) X can be according to certain strategy (as mean allocation, and for example according to load distribution etc.) by these 100 allocation of packets to A, B, C and D.
Can find by above description, in the embodiment of the present invention, multiple the first packets that carry different target informations comprise following which floor meaning:
1, data are surrounded by multiple;
2, each packet has target information separately;
3, there is the packet that target information is different.
Receive these 100 packets that Base Band Unit A, B, C and the D of packet can obtain according to common decapsulation and carry out subsequent treatment, realize multipoint cooperative and receive.
< cooperation sends >
In the specific embodiment of the invention, described Base Band Unit is connected with multiple remote radio unit (RRU)s by described switching equipment, described the second encapsulation unit is specifically for according to remote radio unit (RRU) cooperative information, described the second data are carried out to encapsulation process, obtain carrying multiple second packets of the second different target informations;
The second different target informations is corresponding to different cooperation remote radio unit (RRU)s.
And described remote radio unit (RRU) is arranged in a remote radio unit (RRU) pond being made up of multiple remote radio unit (RRU)s, described remote radio unit (RRU) also comprises:
The first IWU, for according to remote radio unit (RRU) cooperative information, and other cooperation remote radio unit (RRU)s cooperations, realize multipoint cooperative and send.
The embodiment of the present invention also provides a kind of distributed base station, comprises above-mentioned remote radio unit (RRU) and Base Band Unit.
The work of the remote radio unit (RRU) to the embodiment of the present invention, Base Band Unit and distributed base station below further describes as follows.
As shown in Figure 3, compare with the functional block diagram of the existing BBU shown in Fig. 1 and RRU, can find that the distributed base station of the embodiment of the present invention also comprises BBU and RRU two parts, but the BBU of the embodiment of the present invention and RRU have following difference:
1, in the embodiment of the present invention, between BBU and RRU, realize transfer of data (encapsulation unit and the decapsulation unit that wherein arrange are not shown in the drawings) by general packet network, instead of transmit based on CPRI, this has increased flexibility mutual between BBU and RRU greatly;
2, in the embodiment of the present invention, can repartition the function of BBU and RRU, the FFT/IFFT function being originally arranged in BBU in prior art is moved on to RRU, reduce the volume of transmitted data between BBU and RRU;
3, in the embodiment of the present invention, due to the FFT/IFFT function in BBU is moved on to RRU, therefore, can in RRU, carry out screening in advance to upstream data, up frequency domain data corresponding to RB that those are not dispatched to deleted, and further reduces the data of RRU to BBU transmission;
4,, in the embodiment of the present invention, in the time that load of base station is heavier, the data volume of screening output just increases thereupon.Therefore can also compression and decompression be set at BBU and RRU correspondence, further reduce the volume of transmitted data between BBU and RRU.
Should be understood that, above some, except first be essential, other are all optional, those skilled in the art can select one or more to reduce the volume of transmitted data between BBU and RRU as required.
In specific embodiments of the invention, high level in Fig. 3 comprises MAC(Media Access Control, media access control) process, RLC((Radio Link Control, wireless link control) process, PDCP(Packet Data Convergence Protocol, PDCP) process, RRC(Radio Resource Control, Radio Resource control) and NAS(Non-Access Stratum, Non-Access Stratum) process, be not described in detail at this.
Taking the LTE system of 8 antenna 20MHz as example, under 20MHz, systematic sampling rate is [(2048+160) * 2+(2048+14) * 14] * 1000=30.72Mbps; Each 16 bit quantizations of I/Q data.In existing BBU+RRU system, IQ data need adopt 8/10 coding.Data transfer bandwidth between RRU and BBU is 30.72Mbps*32*(10/8 so) * 8=9.8304Gbps.In the embodiment of the present invention, only by the down-sampled function setting of FFT/IFFT and PRACH to after realizing in RRU, transmission bandwidth just can be reduced into 1200*14*32*8*1000=4.3008Gbps.
If efficient resource piece (Resource Block, RB) number is R, the compression ratio of compression algorithm in frequency domain is 1/2, data transfer bandwidth between RRU and BBU is 12*R*14*32*8*1000*1/2 so, maximum transmission bandwidth occurs at full capacity in the situation of (R=100), and data transfer bandwidth is now only 2.1504Gbps.This just means that 10G optical fiber passback can carry 58 antenna 20MHz TD-LTE stations nearly.
Figure 4 shows that the embodiment of the present invention carries out the process chart of data screening.
As shown in Figure 4, first, the schedule information that current MAC layer is issued physical layer by BBU sends to RRU.Secondly, the part L1 data that BBU need to prepare it send to RRU.Above-mentioned MAC layer schedule information arrives before RRU carries out corresponding sub-frame of uplink IQ data processing, makes L1 data after RRU processes, need to meet the sequential of eating dishes without rice or wine of communication protocol.Therefore both do not have absolute time order and function relation.Then, RRU carries out IQ data processing and data screening etc. according to the MAC layer schedule information of receiving after receiving upstream data.Finally, effective L1 data are sent to BBU by RRU.
Said process moves in circles, and has reduced RRU and be transferred to the upstream data of BBU.
Figure 5 shows that the embodiment of the present invention carries out the process chart of cooperative reception.
As shown in Figure 5, in the time carrying out Collaborative processing between different base station.RRU, based on MAC layer schedule information and Collaborative information, need to carry out the Data dissemination of collaborative process to multiple BBU.
Taking RRU1 as example, as shown in Figure 5, RRU1 is multiple packets by the Information encapsulation after screening, wherein the effective L1 data of a part send to BBU1, and another part sends to BBU2 as collaboration data, and BBU2 can be according to Collaborative information in follow-up processing flow by these transfer of data to BBU1, integrate processing by BBU1 according to another part data of the effective L1 data of part that receive and BBU2 transmission, realize cooperative reception.
In like manner, the data that BBU also can send needs cooperation are distributed in an identical manner multiple RRU and send.
Because the data volume of RRU output is with the dynamic change of load of base station situation, in the specific embodiment of the invention, the cooperation process of transmitting based on above-mentioned, can give multiple BBU by the transfer of data of same RRU, also can give same BBU by the transfer of data of multiple RRU.That is to say, by general switch network, the data on RRU can be carried out load balancing neatly between different base station.RRU data volume and Base-Band Processing demand based on needs exchange simultaneously, cutoff crosspoint and BBU in time, reduces base station energy consumption.
Concentrate base band data processing with the form of " baseband pool ", in " baseband pool ", the physical resource at each single station just needn't be according to peak-peak rate configuration so, but be configured according to typical peak rate or statistics peak rate, thereby device resource and cost are significantly saved.
Under existing BBU+RRU framework, based on CPRI agreement, because the IQ data transfer bandwidth of transmission is high, be therefore not easy to carry out dynamic load leveling and economize on electricity, can not meet Collaborative demand, equipment is open and interconnecting property is low.In the distribution-type base station architecture of BBU in the embodiment of the present invention in conjunction with RRU, pass through packet network, reduce the data transfer bandwidth between BBU and RRU, can also carry out easily dynamic load leveling and economize on electricity, can meet efficiently Collaborative demand based on packet network simultaneously.Introduce after general packet switch, equipment has good opening and interconnection and interflow.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1. a remote radio unit (RRU), is characterized in that, described remote radio unit (RRU) carries out data interaction based on packet technology and Base Band Unit, and described remote radio unit (RRU) comprises:
The first encapsulation unit, for based on packet technology, the first data that are sent to described Base Band Unit being carried out to encapsulation process, obtains the first packet;
The first transmitting element, for based on packet technology, described the first Packet Generation being arrived to target Base Band Unit, obtains described the first data by target Base Band Unit by the first packet described in decapsulation;
The first receiving element, the second packet that encapsulates and send based on packet technology for receiving described Base Band Unit;
The first decapsulation unit, for the second packet described in decapsulation, obtains described the second data.
2. remote radio unit (RRU) according to claim 1, it is characterized in that, described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, between described remote radio unit (RRU) and Base Band Unit, be connected with a switching equipment, described the first transmitting element is specifically for arriving described switching equipment by described the first Packet Generation, make the described switching equipment can be according to the first object information of carrying in the first packet, described the first Packet Generation is arrived to described target Base Band Unit corresponding to described first object information,
The second packet that the first receiving element sends specifically for receive described Base Band Unit by described switching equipment, carries the second target information of determining target remote radio unit (RRU) for described switching equipment in described the second packet.
3. remote radio unit (RRU) according to claim 1 and 2, it is characterized in that, described remote radio unit (RRU) also comprises the RF processing unit, Digital IF Processing unit and the fast Fourier transform unit that are linked in sequence, wherein, described the first data are the up frequency domain data of described fast Fourier transform unit output.
4. remote radio unit (RRU) according to claim 1 and 2, it is characterized in that, described remote radio unit (RRU) also comprises the RF processing unit, Digital IF Processing unit, fast Fourier transform unit and the screening unit that are linked in sequence, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select data that the current Resource Block being scheduled for is corresponding as described the first data, be transferred to described the first encapsulation unit.
5. remote radio unit (RRU) according to claim 1 and 2, it is characterized in that, described remote radio unit (RRU) also comprises the RF processing unit being linked in sequence, Digital IF Processing unit, fast Fourier transform unit, screening unit and compression unit, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select transfer of data that the current Resource Block being scheduled for is corresponding to described compression unit, described compression unit is for compressing processing to the data that receive, and using the data after compression as described the first data, be transferred to described the first encapsulation unit.
6. remote radio unit (RRU) according to claim 2, it is characterized in that, described remote radio unit (RRU) is connected with multiple Base Band Unit by described switching equipment, described the first encapsulation unit is specifically for according to Base Band Unit cooperative information, described the first data are carried out to encapsulation process, obtain carrying multiple first packets of different first object information;
Different first object information is corresponding to different cooperation Base Band Unit.
7. remote radio unit (RRU) according to claim 2, is characterized in that, described remote radio unit (RRU) is arranged in a remote radio unit (RRU) pond being made up of multiple remote radio unit (RRU)s, and described remote radio unit (RRU) also comprises:
The first IWU, for according to remote radio unit (RRU) cooperative information, and other cooperation remote radio unit (RRU)s cooperations, realize multipoint cooperative and send.
8. a Base Band Unit, is characterized in that, described Base Band Unit carries out data interaction based on packet technology and remote radio unit (RRU), and described Base Band Unit comprises:
The second receiving element, the first packet sending for receive described remote radio unit (RRU) based on packet technology;
The second decapsulation unit, for the first packet described in decapsulation, obtains described the first data;
The second encapsulation unit, for the second data that are sent to described remote radio unit (RRU) are carried out to encapsulation process, obtains the second packet;
The second transmitting element, for based on packet technology, described the second Packet Generation being arrived to target remote radio unit (RRU), obtains described the first data by target remote radio unit (RRU) by the first packet described in decapsulation.
9. Base Band Unit according to claim 8, is characterized in that,
Described remote radio unit (RRU) is connected with multiple described Base Band Unit, and/or described Base Band Unit is while being connected with multiple described remote radio unit (RRU)s, between described remote radio unit (RRU) and Base Band Unit, be connected with a switching equipment, described the second transmitting element is specifically for arriving described switching equipment by described the second Packet Generation, make described switching equipment according to second target information of carrying in the second packet, described the second Packet Generation to be arrived to described target remote radio unit (RRU) corresponding to described the second target information;
The first packet that described the second receiving element sends specifically for receive described remote radio unit (RRU) by described switching equipment, carries the first object information of determining target Base Band Unit for described switching equipment in described the first packet.
10. Base Band Unit according to claim 8 or claim 9, it is characterized in that, described remote radio unit (RRU) comprises the RF processing unit, Digital IF Processing unit and the fast Fourier transform unit that are linked in sequence, wherein, described the first data are the up frequency domain data of described fast Fourier transform unit output.
11. Base Band Unit according to claim 8 or claim 9, it is characterized in that, described remote radio unit (RRU) comprises the RF processing unit, Digital IF Processing unit, fast Fourier transform unit and the screening unit that are linked in sequence, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select data corresponding to the current Resource Block being scheduled for, described the first data are the data of described screening unit output.
12. Base Band Unit according to claim 8 or claim 9, it is characterized in that, described remote radio unit (RRU) comprises the RF processing unit being linked in sequence, Digital IF Processing unit, fast Fourier transform unit, screening unit and compression unit, described screening unit is for the up frequency domain data from fast Fourier transform unit output according to schedule information, select transfer of data that the current Resource Block being scheduled for is corresponding to described compression unit, described compression unit is for compressing processing to the data that receive, described the first data are the data of described compression unit output,
Described Base Band Unit also comprises:
Decompression unit, for decompressing to the first data of described the second decapsulation unit output.
13. Base Band Unit according to claim 9, is characterized in that, described Base Band Unit is arranged in a Base Band Unit pond being made up of multiple Base Band Unit, and described Base Band Unit also comprises:
The second IWU, for according to Base Band Unit cooperative information, and other cooperation Base Band Unit cooperations, realize multipoint cooperative and receive.
14. Base Band Unit according to claim 9, it is characterized in that, described Base Band Unit is connected with multiple remote radio unit (RRU)s by described switching equipment, described the second encapsulation unit is specifically for according to remote radio unit (RRU) cooperative information, described the second data are carried out to encapsulation process, obtain carrying multiple second packets of the second different target informations;
The second different target informations is corresponding to different cooperation remote radio unit (RRU)s.
15. 1 kinds of distributed base stations, is characterized in that, comprise the remote radio unit (RRU) described in any one in claim 1-7.
16. 1 kinds of distributed base stations, is characterized in that, comprise the Base Band Unit described in any one in claim 8-14.
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| CN201310173242.6A CN104144529B (en) | 2013-05-10 | 2013-05-10 | A kind of remote radio unit (RRU), Base Band Unit and distributed base station |
| PCT/CN2014/077104 WO2014180339A1 (en) | 2013-05-10 | 2014-05-09 | Radio remote unit, base band unit, and distributed base station |
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| CN104144529B (en) | 2017-11-21 |
| WO2014180339A1 (en) | 2014-11-13 |
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