CN102638299B - Method and system for interconnecting remote radio units - Google Patents
Method and system for interconnecting remote radio units Download PDFInfo
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- CN102638299B CN102638299B CN201210031586.9A CN201210031586A CN102638299B CN 102638299 B CN102638299 B CN 102638299B CN 201210031586 A CN201210031586 A CN 201210031586A CN 102638299 B CN102638299 B CN 102638299B
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Abstract
The embodiment of the invention discloses a system and a method for interconnecting remote radio units. The system comprises a baseband unit and at least two remote radio units, wherein at least one remote radio unit is connected with the baseband unit; each remote radio unit is used for receiving a master antenna signal and a slave antenna signal, directly performing mid-frequency processing on the signals and sending the signals to the baseband unit; the master antenna signal or the slave antenna signal received by at least one remote radio unit comprises a carrier loaded by other remote radio units; and the baseband unit is used for processing the master antenna signals and the slave antenna signals which are subjected to mid-frequency processing and sent by the remote radio units. According to the embodiment of the invention, different remote radio units are interconnected easily.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of interconnecting method and system of remote radio unit.
Background technology
The carrier number that RRU (Remote Radio Unit, remote radio unit) general at present carries is fixing, often can not meet the demand of dense city to capacity.In order to increase capacity, in prior art, proposing the method for RRU interconnection, carrier wave can be increased by the interconnection of multiple RRU and expanding capacity.
In prior art, being interconnected on radio frequency of multiple RRU realizes, and is specially and increases main collection radio frequency delivery outlet RXM-OUT and diversity rf input port RXD-IN on RRU.3 carrier waves are realized for RRU1 and RRU2 with needs, if a RRU can only carry two carrier waves, RRU1 process carrier wave 1 and carrier wave 2, RRU2 process carrier wave 3.During transmitting, a RRU1 channel emission carrier wave 1 and carrier wave 2, goes out from the antennal interface of RRU1 through antenna transmission; RRU2 launches carrier wave 3, goes out from the antennal interface of RRU2 through antenna transmission.During reception, main collection aerial signal receives from RRU1, directly to the reception main collection signal of RRU1 as carrier wave 1 and carrier wave 2, separate a road signal by power splitter and sent by RXM-OUT, enter the main collection signal of reception of the carrier wave 3 that RRU2 carries as RRU2 from the RXD-IN of RRU2; Diversity antenna signals receives from RRU2, directly to the receive diversity signal of RRU2 as carrier wave 3, separate a road signal by power splitter to be sent by RXM-OUT, enter the receive diversity signal of carrier wave 1 that RRU1 carries as RRU1 and carrier wave 2 from the RXD-IN of RRU1, thus achieved the function of 3 carrier waves by RRU interconnection.
Inventor is realizing in process of the present invention, finds to there is following problem in prior art:
Extra radio-frequency channel is there is in this interconnecting method, namely power splitter outputs to the passage of RXM-OUT and the RXD-IN passage to processing unit, because this increasing PCB (Print Circuit Board, printed circuit board (PCB)) layout difficulty, in addition, extra joint and external cable add cost and the installation difficulty of RRU.
Summary of the invention
Embodiments of the invention provide a kind of interconnecting method and system of remote radio unit, for realizing the simple and easy interconnection of remote radio unit RRU.
Embodiments of the invention provide a kind of interconnection system of remote radio unit, comprise Base Band Unit and at least two remote radio units, and remote radio unit described at least one are connected with described Base Band Unit;
Described at least two remote radio units, for receiving main collection aerial signal and diversity antenna signals and being directly sent to described Base Band Unit after intermediate frequency process, the main collection aerial signal having at least a described remote radio unit to receive or diversity antenna signals comprise the carrier wave being carried on other remote radio unit;
Described Base Band Unit, processes for the described main collection aerial signal after intermediate frequency process that sends described remote radio unit and diversity antenna signals.
Embodiments of the invention also provide a kind of interconnecting method of remote radio unit, are applied in the system comprising Base Band Unit and at least two remote radio units, and remote radio unit described at least one is connected with described Base Band Unit; Described method comprises:
Described at least two remote radio units receive main collection aerial signal and diversity antenna signals and are directly sent to described Base Band Unit after intermediate frequency process, and the main collection aerial signal having at least a described remote radio unit to receive or diversity antenna signals comprise the carrier wave being carried on other remote radio unit;
The described main collection aerial signal after intermediate frequency process that described Base Band Unit sends described remote radio unit and diversity antenna signals process.
Compared with prior art, embodiments of the invention have the following advantages:
Base Band Unit is connected from different remote radio units, receive the signal of different antennae by remote radio unit and be sent to Base Band Unit and process, avoid and add extra radio-frequency channel in remote radio unit, reduce the PCB layout difficulty in remote radio unit, reduce installation difficulty and cost, achieve the simple and easy interconnection of different remote radio units.
Accompanying drawing explanation
Figure 1A to Fig. 1 C is the structural representation of the interconnection system of remote radio unit in embodiments of the invention;
Fig. 2 A to Fig. 2 C is another structural representation of the interconnection system of remote radio unit in embodiments of the invention;
Fig. 3 is that the interconnection of two RRU in embodiments of the invention realizes schematic diagram;
Fig. 4 is that the interconnection of three RRU in embodiments of the invention realizes schematic diagram;
Fig. 5 is that in embodiments of the invention, another interconnection of two RRU realizes schematic diagram;
Fig. 6 is the interconnecting method flow chart of RRU in embodiments of the invention.
Embodiment
Embodiments of the invention provide the interconnection system of a kind of remote radio unit RRU, comprise Base Band Unit and at least two remote radio units, and remote radio unit described at least one are connected with described Base Band Unit.Described at least two remote radio units, for receiving main collection aerial signal and diversity antenna signals and being directly sent to described Base Band Unit after intermediate frequency process, the main collection aerial signal having at least a described remote radio unit to receive or diversity antenna signals comprise the carrier wave being carried on other remote radio unit; Described Base Band Unit, processes for the described main collection aerial signal after intermediate frequency process that sends remote radio unit and diversity antenna signals.
To comprise two remote radio units, this interconnection system comprises the first remote radio unit 1, second remote radio unit 2 and Base Band Unit 3, first remote radio unit 1 bearing carrier wave 1, carrier wave 2, (here bearing carrier wave 1 be meant to this Remote Radio Unit can to carrier wave 1 carry out reception process and launch process), the second remote radio unit 2 bearing carrier wave 3, carrier wave 4; The annexation of this system can as shown in any one situation in Figure 1A ~ Fig. 1 C:
As shown in Figure 1A, the first remote radio unit 1 is connected with Base Band Unit 3, and the second remote radio unit 2 is connected with Base Band Unit 3, forms star structure;
As shown in Figure 1B, the first remote radio unit 1 is connected with Base Band Unit 3, and the second remote radio unit 2 is connected with the first remote radio unit 1, forms chain structure;
As shown in Figure 1 C, the first remote radio unit 1 is connected with Base Band Unit 3, and the second remote radio unit 2 is connected with Base Band Unit 3 and the first remote radio unit 1 simultaneously, looping structure;
First remote radio unit 1 and the second remote radio unit 2 are for receiving main collection aerial signal and diversity antenna signals and being directly sent to Base Band Unit 3 after intermediate frequency process, first remote radio unit 1 can select the main collection aerial signal of reception carrier 1 ~ 4, and the second remote radio unit 2 can select the diversity antenna signals of reception carrier 1 ~ 4.
Base Band Unit 3, processes for the described main collection aerial signal after intermediate frequency process that sends described remote radio unit and diversity antenna signals.
As shown in Figure 3, in another embodiment of the present invention, to comprise three remote radio units, this interconnection system comprises the first remote radio unit 1, second remote radio unit 2, Base Band Unit 3 and the 3rd remote radio unit 4, first remote radio unit 1 bearing carrier wave 1, carrier wave 2, second remote radio unit 2 bearing carrier wave 3, carrier wave 4, the connected mode of the 3rd remote radio unit 4 bearing carrier wave 5, carrier wave the 6, three remote radio unit 4 and the first remote radio unit 1, second remote radio unit 2 and Base Band Unit 3 is as shown in Fig. 2 A ~ 2C.
As shown in Figure 2 A, the first remote radio unit 1, second remote radio unit 2 and the 3rd remote radio unit 4 are individually connected with Base Band Unit 3, composition star structure.
As shown in Figure 2 B, the first remote radio unit 1 is connected with Base Band Unit 3, and the second remote radio unit 2 is connected with the first remote radio unit 1, and the 3rd remote radio unit 4 is connected with the second remote radio unit 2, composition chain structure.
As shown in Figure 2 C, the first remote radio unit 1 is connected with Base Band Unit 3 and the 3rd remote radio unit 4, and the second remote radio unit 2 is connected with Base Band Unit 3 and the 3rd remote radio unit 4, composition loop configuration.
First remote radio unit 1, second remote radio unit 2 and the 3rd remote radio unit 4 are for receiving main collection aerial signal and diversity antenna signals and being directly sent to Base Band Unit 3 after intermediate frequency process; Wherein, first remote radio unit 1 can select the main collection aerial signal of reception carrier 1 ~ 4, second remote radio unit 2 can select the diversity antenna signals of reception carrier 1 ~ 4, and the 3rd remote radio unit 4 can select the main collection aerial signal of reception carrier 5 ~ 6 and the diversity antenna signals of carrier wave 5 ~ 6.
Base Band Unit 3, processes for the described main collection aerial signal after intermediate frequency process that sends described remote radio unit and diversity antenna signals.
The interconnection of above-mentioned each remote radio unit and Base Band Unit can be realized, as CPRI (Common Public Radio Interface, common public radio interface) interface by the special interface of remote radio unit; By CPRI interface, the direct interaction of data between different remote radio units and Base Band Unit, can be carried out, or the forwarding of data.Such as the chain structure shown in Figure 1B, first remote radio unit 1 directly can pass through CPRI interface and Base Band Unit 3 interaction data, and the second remote radio unit 2 can also send to the data of Base Band Unit 3 to pass through Base Band Unit 3 by CPRI interface by the first remote radio unit 1.
In addition, when needs are more than three remote radio unit interconnection, as long as multiple remote radio unit is used the mode shown in similar above-mentioned Fig. 2 A ~ Fig. 2 C, each remote radio unit is interconnected.
In an alternative embodiment of the invention, for loop configuration, the interconnection describing two RRU realizes schematic diagram.As shown in Figure 3: comprise a RRU 10, the 2nd RRU 20 and BBU (BaseBandUnit, Base Band Unit) 30.Wherein, one RRU 10 is by CPRI-E (CPRI-East, common public radio interface E) interface is connected with BBU 30, and be connected with the CPRI-E interface of the 2nd RRU by CPRI-W (CPRI-West, common public radio interface W) interface; 2nd RRU 30 is connected with BBU 30 by CPRI-W interface.Here CPRI-E and CPRI-W only for distinguishing different CPRI interfaces, its structure and the function had as broad as long.First remote radio unit 10 bearing carrier wave 1, carrier wave 2, second remote radio unit 20 bearing carrier wave 3, carrier wave 4.Below the concrete structure of a RRU 10 and the 2nd RRU 20 is described.
For a RRU 10, when realizing RRU interconnect function and double-antenna receiving diversity, the ANT1 interface 11 of the one RRU10 is connected with the main collection antenna of sector, four carrier frequency receive paths of the one RRU 10 all only select the main collection aerial signal of reception carrier 1 ~ 4 (as shown in Figure 3, by the local oscillator of the intermediate-frequency channel of the former diversity reception signal of reasonable set handling (as being set to process carrier wave 3 respectively, carrier wave 4), and the switching of switch 16 can realize), and by the signal that receives by duplexer Duplexer 12, LNA (Low Noise Amplifier, low noise amplifier) 13, power splitter 14 and intermediate-frequency channel, carry out being sent to processing unit 15 after intermediate frequency process through intermediate-frequency channel.In addition, processing unit 15 is connected with power splitter 14 by switch 16, makes the intermediate-frequency channel being originally used for processing diversity antenna signals can receive main collection aerial signal.The main collection aerial signal received is sent to BBU30 by CPRI-E interface by processing unit 15.
For the 2nd RRU 20, when realizing RRU interconnect function and double-antenna receiving diversity, the ANT1 interface 21 of the 2nd RRU20 is connected with the diversity antenna of sector, four carrier frequency receive paths of the 2nd RRU 20 all only select the diversity antenna signals of reception carrier 1 ~ 4 (as shown in Figure 3, by the local oscillator of the intermediate-frequency channel of the former main collection Received signal strength of reasonable set handling (as being set to process carrier wave 1 respectively, carrier wave 2), and the switching of switch 26 can realize), and by the signal that receives by duplexer Duplexer 22, LNA23, power splitter 24 and intermediate-frequency channel, carry out being sent to processing unit 25 after intermediate frequency process through intermediate-frequency channel.In addition, processing unit 25 is connected with power splitter 24 by switch 26, makes 4 road intermediate-frequency channels can both be used for the reception of diversity antenna signals.The main collection channel signal received is sent to BBU 30 by CPRI-W interface by processing unit 25.
Possess an interconnected functional blocks 31 in BBU 30, to the main collection signal received from a RRU 10 and the synthesis carrying out main collection signal and diversity signal from the diversity signal that the 2nd RRU 20 receives, realize receive diversity.
In addition, the effect of an above-mentioned RRU and the 2nd RRU breaker in middle configures to switch according to the antenna feeder of RRU, when such as community only needs two carrier wave, only needs a RRU to realize.Then a RRU needs to connect two antennas, and by switching over to receive path below, is connected, realizes receive diversity with receive diversity passage.
When needing to realize the RRU interconnection of more than three or three, one embodiment of the invention as shown in Figure 4, are interconnected as example with three RRU.When needing to realize more than three and three RRU interconnection, according to antenna amount, external merit combiner device is needed during double-antenna receiving diversity, merit combiner device is used for the signal of two antennas to give three RRU, concrete, two antennas can be connected with two mixers respectively, by two mixers, the signal of two antennas be sent to three RRU afterwards.Signal processing method in this situation is as follows:
The signal received from antenna is sent to connected RRU by merit combiner device respectively.Connect main collection antenna for the first mixer, the second mixer connects diversity antenna, the main collection aerial signal received is sent to the ANT1 interface of RRU1 and the ANT1 interface of RRU2 by the first mixer, RRU1 carries out choosing receipts to main collection aerial signal (as carrier wave 1 ~ 4), directly BBU is sent to after process, RRU2 carries out choosing to the main collection aerial signal (as carrier wave 5 ~ 6) received equally and receives, and is directly sent to BBU after process.In addition, the diversity antenna signals received is sent to the ANT2 interface of RRU2 and the ANT1 interface of RRU3 by the second mixer, RRU3 carries out choosing to diversity antenna signals (as carrier wave 1 ~ 4) and receives and be sent to BBU, and RRU2 carries out choosing to the diversity antenna signals received (as carrier wave 5 ~ 6) equally and receives and be sent to BBU.By BBU, the main collection aerial signal received and diversity antenna signals are processed.
During the interconnection of above-mentioned three RRU, also multiple antennas mode can be adopted, as each RRU connects an antenna, the situation of the RRU of two shown in its signal processing with Fig. 3 is similar, respectively the main collection aerial signal received and diversity antenna signals are sent to BBU by multiple RRU, process by BBU is unified.This handling process does not carry out repeating to introduce at this.
In addition, except interconnected functional blocks is placed in except BBU in the embodiment of multiple RRU interconnection by above-mentioned realization, the method for being carried out main diversity signal synthesis by the processing unit of RRU can also be adopted.Concrete, be interconnected as example still with two RRU.As shown in Figure 5, forwarding capability module 36 is added in BBU, after receiving main collection aerial signal and diversity antenna signals, select a RRU or multiple RRU, and main collection aerial signal and diversity antenna signals are sent to described RRU by CPRI interface, carried out the synthesis of main collection aerial signal and diversity antenna signals by the processing unit of described RRU, realize receive diversity.
In the interconnection system of the above-mentioned remote radio unit that the embodiment of the present invention provides, Base Band Unit is connected with remote radio unit, receive the signal of different antennae by each remote radio unit and be sent to Base Band Unit and process, avoid and add extra radio-frequency channel in remote radio unit, namely in prior art, power splitter outputs to two passages of RXM-OUT and RXD-IN to processing unit, reduce the PCB layout difficulty in remote radio unit, reduce installation difficulty and cost, achieve the simple and easy interconnection of different remote radio units.
A kind of interconnecting method of remote radio unit is also provided in embodiments of the invention, is applied in the system comprising Base Band Unit and at least two remote radio units; And at least one remote radio unit is connected with described Base Band Unit.As shown in Figure 6, the interconnecting method of this remote radio unit comprises:
Step s101, at least two remote radio units receive main collection aerial signal and diversity antenna signals and are directly sent to described Base Band Unit after intermediate frequency process;
The described main collection aerial signal after intermediate frequency process that step s102, Base Band Unit send described remote radio unit and diversity antenna signals process.
Concrete, this Base Band Unit can comprise the process that the main collection aerial signal received and diversity antenna signals carry out: (1) carries out signal syntheses to the described main collection aerial signal that receives and diversity antenna signals.Or (2) carry out forward process to the main collection aerial signal received and diversity antenna signals, carry out signal syntheses by the remote radio unit receiving described main collection aerial signal and diversity antenna signals.
In the interconnecting method of the above-mentioned remote radio unit that the embodiment of the present invention provides, Base Band Unit remote radio unit is connected, receive the signal of different antennae by each remote radio unit and be sent to Base Band Unit and process, avoid and add extra radio-frequency channel in remote radio unit, namely in prior art, power splitter outputs to two passages of RXM-OUT and RXD-IN to processing unit, reduce the PCB layout difficulty in remote radio unit, reduce installation difficulty and cost, the simple and easy interconnection achieving different remote radio units realizes diversity reception.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. an interconnection system for remote radio unit, is characterized in that, comprise Base Band Unit and at least two remote radio units, and remote radio unit described at least one is connected with described Base Band Unit;
Described at least two remote radio units, for receiving main collection aerial signal and diversity antenna signals and being directly sent to described Base Band Unit after intermediate frequency process, the main collection aerial signal having at least a described remote radio unit to receive or diversity antenna signals comprise the carrier wave being carried on other remote radio unit;
Described Base Band Unit, processes for the described main collection aerial signal after intermediate frequency process that sends described remote radio unit and diversity antenna signals.
2. the system as claimed in claim 1, is characterized in that, described remote radio unit comprises:
Antennal interface, duplexer, low noise amplifier, power splitter, intermediate-frequency channel, switch and processing unit,
Described antennal interface is connected with antenna, and the aerial signal that described antennal interface receives is sent to described intermediate-frequency channel by duplexer, low noise amplifier, switch and power splitter and carries out intermediate frequency process;
Described processing unit, for being sent to described Base Band Unit by the aerial signal after described intermediate-frequency channel process.
3. system as claimed in claim 2, it is characterized in that, described Base Band Unit comprises:
Forwarding capability module, for being forwarded to any one or more described remote radio unit by the main collection aerial signal received and diversity antenna signals.
4. system as claimed in claim 3, is characterized in that, the main collection aerial signal received and diversity antenna signals also for receiving main collection aerial signal and the diversity antenna signals of the transmission of described forwarding capability module, and are carried out signal syntheses by described processing unit.
5. the system as described in any one of Claims 1-4, is characterized in that, any two sides between described remote radio unit with described Base Band Unit are connected by common public radio interface CPRI interface.
6. an interconnecting method for remote radio unit, is characterized in that, is applied in the system comprising Base Band Unit and at least two remote radio units, and remote radio unit described at least one is connected with described Base Band Unit, and described method comprises:
Described at least two remote radio units receive main collection aerial signal and diversity antenna signals and are directly sent to described Base Band Unit after intermediate frequency process, and the main collection aerial signal having at least a described remote radio unit to receive or diversity antenna signals comprise the carrier wave being carried on other remote radio unit;
The described main collection aerial signal after intermediate frequency process that described Base Band Unit sends described remote radio unit and diversity antenna signals process.
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| CN201210031586.9A CN102638299B (en) | 2008-06-30 | 2008-06-30 | Method and system for interconnecting remote radio units |
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| CN201210031586.9A CN102638299B (en) | 2008-06-30 | 2008-06-30 | Method and system for interconnecting remote radio units |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101282207A Division CN101321011B (en) | 2008-06-30 | 2008-06-30 | Interconnection method and system for remote radio unit |
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| CN102638299A CN102638299A (en) | 2012-08-15 |
| CN102638299B true CN102638299B (en) | 2015-05-27 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1816181A (en) * | 2005-02-03 | 2006-08-09 | 芯通科技（成都）有限公司 | Middle-frequency transmission method and middle-frequency interface for base-station to realize radio-frequency zoom-out |
| CN1929672A (en) * | 2006-09-22 | 2007-03-14 | 华为技术有限公司 | Up signal merging method under sector discerption mode and base station system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7684526B2 (en) * | 2006-09-21 | 2010-03-23 | Broadcom Corporation | Frequency domain equalizer for dual antenna radio |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1816181A (en) * | 2005-02-03 | 2006-08-09 | 芯通科技（成都）有限公司 | Middle-frequency transmission method and middle-frequency interface for base-station to realize radio-frequency zoom-out |
| CN1929672A (en) * | 2006-09-22 | 2007-03-14 | 华为技术有限公司 | Up signal merging method under sector discerption mode and base station system |
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