CN101166064A - Conversion device for RF remote distribution system in communication system - Google Patents
Conversion device for RF remote distribution system in communication system Download PDFInfo
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- CN101166064A CN101166064A CNA2006101358673A CN200610135867A CN101166064A CN 101166064 A CN101166064 A CN 101166064A CN A2006101358673 A CNA2006101358673 A CN A2006101358673A CN 200610135867 A CN200610135867 A CN 200610135867A CN 101166064 A CN101166064 A CN 101166064A
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Abstract
This invention discloses a converting device used in a RF remote distribution system in the communication system including: a converting module with the interface of one end connected with a set of RF remote or an upper level converting device and the interface of another end connected with another set of back stage converting device or baseband pool/base station/near end device, a control center monitoring upper/lower level modules and alarming, a clock module guaranteeing unity of clocks of the modules and a supply module guaranteeing normal work of the modules.
Description
Technical field
The present invention relates to the employed conversion equipment of a kind of RF remote compartment system, relate in particular to 2G, 3G (second generation, the third generation wireless communication system) distributed covering network of field of wireless communication.
Background technology
Along with the development of 3G technology,, the distributed solution of BBU (baseband pool)+RRU (Remote Radio Unit) has been arranged in order to solve the radio-frequency power loss that feeder line brings.This scheme links to each other BBU by optical fiber usually with RRU.Have digital optical fiber repeater system in the repeater at present, the near-end machine also is connected by optical fiber with remote termination.The block diagram of two kinds of systems is seen Fig. 1.
When the quantity of the corresponding RRU/ remote termination of BBU/ near-end machine is very big,, then require BBU/ near-end machine to have a large amount of optical interfaces if the RRU/ remote termination is directly linked to each other with BBU/ near-end machine.Because the optical-electrical converter price is higher relatively, RRU/ remote termination and the BBU/ near-end machine of this moment all have a large amount of optical-electrical converters, and cost can increase greatly.
Summary of the invention
Defective and deficiency at the prior art existence, the invention provides the employed conversion equipment of RF remote compartment system in a kind of communication system, can between RF remote or upper level conversion equipment and back one-level conversion equipment or baseband pool/base station/near-end machine, realize conversion of signals.
In order to reach the foregoing invention purpose, the employed conversion equipment of RF remote compartment system in the communication system of the present invention comprises: an end communication interface links to each other with one group of RF remote or upper level conversion equipment, other end communication interface and back one-level conversion equipment or modular converter that baseband pool/base station/the near-end machine links to each other; To each module initialization, and on carrying out/control centre of subordinate's module monitors and alarm; For other each modules provide work clock, guarantee the clock module of other each certain piece clock synchronizations; Guarantee that this installs the supply module of each module operate as normal;
Wherein, one group of signal of telecommunication of modular converter received RF far-end or upper level conversion equipment, and, send to back one-level conversion equipment or baseband pool/base station/near-end machine with another group signal of telecommunication of described one group of electrical signal conversion Cheng Yuhou one-level conversion equipment or baseband pool/base station/near-end machine transmission rate coupling; Described modular converter also receives another group signal of telecommunication of back one-level conversion equipment or baseband pool/base station/near-end machine transmission, and convert one group of signal of telecommunication with RF remote or upper level conversion equipment rate-matched to, send to RF remote or upper level conversion equipment.
In the employed conversion equipment of RF remote compartment system in the above-mentioned communication system, described modular converter is the multiplex/demultiplex module, and perhaps numeral is closed road/distribution module, and perhaps Chuan Lian multiplex/demultiplex module and numeral closed road/distribution module.
In the employed conversion equipment of RF remote compartment system in the above-mentioned communication system, be in series with first electrical interface that is used to mate the signal of telecommunication between RF remote or upper level conversion equipment and the modular converter between RF remote or upper level conversion equipment and the modular converter; Be in series with second electrical interface that is used to mate the signal of telecommunication between modular converter and back one-level conversion equipment or the baseband pool/base station/near-end machine between modular converter and back one-level conversion equipment or the baseband pool/base station/near-end machine.
In the employed conversion equipment of RF remote compartment system in the above-mentioned communication system, the signal of telecommunication of described first electrical interface is the low speed signal of telecommunication, and the described low speed signal of telecommunication is the signal of telecommunication that speed is lower than 1200 megahertzes.
In the employed conversion equipment of RF remote compartment system in the above-mentioned communication system, be in series with photoelectric conversion module between second electrical interface and back one-level conversion equipment or the baseband pool/base station/near-end machine.
In the employed conversion equipment of RF remote compartment system in the above-mentioned communication system, described first electrical interface and/or second electrical interface are Category-5 twisted pairs.
In the employed conversion equipment of RF remote compartment system in the above-mentioned communication system, described RF remote be the radio frequency in the radio frequency stretch system zoom out or digital optical fiber direct station in remote termination.
Adopt device of the present invention, optical interface and optical-electrical converter on a large amount of RRU/ remote terminations and the BBU/ near-end machine have been saved, compared with prior art, reduced the design complexities of baseband pool/base station/near-end machine, reduced the cost of RF remote and baseband pool/base station/near-end machine, in addition, when being the low speed electrical interface between this device and the RF remote, common low speed connecting line be can adopt,, expensive optical fiber and broadband twisted-pair feeder saved as Category-5 twisted pair, this device is independent of miscellaneous equipment, but flexible configuration has reduced networking cost in the place of needs, has increased the flexibility of networking.
Adopt device of the present invention, optical interface and optical-electrical converter on a large amount of RRU/ remote terminations and the BBU/ near-end machine have been saved, compared with prior art, reduced the design complexities of baseband pool/base station/near-end machine, reduced the cost of RF remote and baseband pool/base station/near-end machine, in addition, when being the low speed electrical interface between this device and the RF remote, common low speed connecting line be can adopt,, expensive optical fiber and broadband twisted-pair feeder saved as Category-5 twisted pair, this device is independent of miscellaneous equipment, but flexible configuration has reduced networking cost in the place of needs, has increased the flexibility of networking.
Description of drawings
Fig. 1 is existing RF remote interface schema;
Fig. 2 is after adding conversion equipment, and RF remote and baseband pool/base station/near-end machine is one to one the time, improved RF remote distributed system;
Fig. 3 is the function diagram one of conversion equipment among Fig. 2;
Fig. 4 is the function diagram two of conversion equipment among Fig. 2;
Fig. 5 is the function diagram three of conversion equipment among Fig. 2;
Fig. 6 is the basic functional principle of Multiplexing module;
Fig. 7 is the basic functional principle of demultiplexing module;
Fig. 8 is the basic functional principle that numeral is closed the road;
Fig. 9 is the basic functional principle of digital distribution.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing:
Conversion equipment of the present invention is used to finish the interface conversion between RF remote and the baseband pool/base station/near-end machine, sees Fig. 2.The RF remote here can be that the radio frequency in the radio frequency stretch system zooms out, and also can be the remote termination in the digital optical fiber direct station.Drawn among the figure and between a RF remote and baseband pool/base station/near-end machine, added the situation of conversion equipment.Pass through signal of telecommunication communication between RF remote and the conversion equipment; Pass through the signal of telecommunication or light signal communication between baseband pool/base station/near-end machine and the conversion equipment.Conversion equipment both sides interface also can have a plurality of RF remotes and a plurality of baseband pool/base station/near-end machine.According to different networking situations, can use the one-level conversion equipment, also can use multistage conversion equipment.When using multistage conversion equipment, can there be part RF remote and first order conversion equipment to carry out communication, and the electrical interface by first order conversion equipment 2 communicates with second level conversion equipment, by that analogy, also the part RF remote and the second level can be arranged, the perhaps third level, by that analogy, the electrical interface 1 of conversion equipment (first electrical interface) carries out communication.The electrical interface 2 of the conversion equipment of afterbody (second electrical interface) carries out communication with baseband pool/base station/near-end machine.
The concrete function block diagram of conversion equipment is seen Fig. 3 and Fig. 4.This conversion equipment can be handled the conversion from N road signal to M road signal.Electrical interface 1, multiplex/demultiplex module, numeral that N road signal is contained in inside are closed road/distribution module, the electrical interface 2 of M road signal, clock module, Surveillance center, supply module several sections, if M road semaphore request is an optical communication, electrical interface 2 back connect photoelectric conversion module, and this module is optional according to interface definition.According to the effect difference of this conversion equipment, multiplex/demultiplex, numeral are closed road/distribution can select different modules, also can both be used in combination.
The function of each module is as follows:
Electrical interface 1: carry out level conversion, string and conversion, thereby the conversion of signals of RF remote or the output of upper level conversion equipment is the treatable signal of multiplex/demultiplex module.This electrical interface can be a high-speed electrical signals, also can be the signal of telecommunication of low speed, recommends low speed signal, and low speed signal is the signal of telecommunication that speed is lower than 1200 megahertzes.When carrying out communication, can as Category-5 twisted pair, transmit with common twisted-pair feeder by the low speed signal of telecommunication.The form of level conversion and string and conversion is corresponding with RF remote according to the requirement of RF remote.When the signal of telecommunication of the signal of telecommunication of RF remote and modular converter had mated, electrical interface 1 can omit.
The multiplex/demultiplex module: this module comprises: multiplexing, demultiplexing function.For upward signal, realize multiplexing function, as shown in Figure 5.For radio frequency stretch system, be the IQ signal here; For digital direct discharging station, be digital signal D here.N road IQ/ digital signal to input is carried out multiplexingly, obtains output IQ/ digital signal as shown in the figure.If require output M road signal, then N road input signal is divided into M group, the output signal output of corresponding M road, multiplexing respectively back according to certain rule.For downstream signal, realize the demultiplexing function, as shown in Figure 6.For one road IQ multiplexed signals of input, through obtaining N road IQ/ digital signal after the demultiplexing function.If input has M road multiplexed signals, then respectively this M road signal is carried out demultiplexing, obtain required N road output IQ/ digital signal, as shown in Figure 7.
Numeral is closed road/distribution module: this module comprises: numeral is closed road, distribution function.For upward signal, the realization numeral is closed the road function, as shown in Figure 8.For radio frequency stretch system, be the IQ signal here; For digital direct discharging station, be digital signal D here.The N road IQ/ digital signal of input multiply by corresponding weighting factor respectively, with the output signal summation that obtains, obtains one tunnel new IQ/ digital signal then, as new upward signal output.If require output M road, then N road signal is divided into M group according to certain rule, be weighted multiplication and summation respectively, then the signal after the summation of M road is outputed to M port respectively.For downstream signal, realize distribution function, as shown in Figure 9.One road IQ/ digital signal of input is copied into the identical IQ/ digital signal in N road, sends into N electrical interface respectively.If M road input signal then copies to each delivery outlet according to certain rule.
Adopt multiplex/demultiplex module and numeral to close modular converters such as road/distribution module, saved the conversion equipment that should be arranged on baseband pool/base station/near-end machine and the RF remote, reduced the design complexities of baseband pool/base station/near-end machine, reduced the cost of RF remote and baseband pool/base station/near-end machine
Electrical interface 2: this electrical interface comprises and goes here and there conversion, level conversion function.And the form of string conversion, level conversion is according to back level module, such as back one-level conversion equipment, and perhaps baseband pool/base station/near-end machine, the form of requirement is changed.This electrical interface output can be the high speed electrical interface, also can be the low speed electrical interface, selects according to different output needs.When the baseband pool/base station/signal of telecommunication of near-end machine and the signal of telecommunication of modular converter had mated, electrical interface 2 can omit.
Opto-electronic conversion: this module is used for up electrical signal conversion is become the level of optical-electrical converter needs, convert light signal then to, convert descending light signal to the signal of telecommunication, and convert the level that electrical interface 2 needs to, use this module to save optical interface and optical-electrical converter on a large amount of RRU/ remote terminations and the BBU/ near-end machine, reduced the cost of RF remote and baseband pool/base station/near-end machine.Whether this module is optional, requires to determine needs according to the input of back level.If back level module, as conversion equipment, perhaps baseband pool/base station/near-end machine is an optical fiber interface, then needs to add this module; If electrical interface, then this module can be omitted.
Clock module: the function of clock module comprises: the downlink data by the back level is sent into extracts this and installs needed synchronised clock; Obtain the clock of the various speed of this device needs according to this clock, send into each module, guarantee the operate as normal of this device.
Control centre: the function of control centre comprises: each chip to this device carries out initialization operation, monitoring, handles various alarms, finishes alarm and detects reporting of information, realizes that subordinate is to the monitoring of this device etc.; Finish/monitor message of subordinate's module transmits.
Supply module: be used to finish outside input power supply installs the required power supply of each module to this conversion, to guarantee that this is installed the power supply normal power supply of each module.
Benefit of the present invention is, when carrying out indoor covering, if between RF remote and the conversion equipment be the electrical interface of low speed, can pass through the Category-5 twisted pair communication, because building inside has a large amount of Category-5 twisted pair interfaces, can arrange net very easily, also save a large amount of optical fiber and broadband twisted-pair feeder simultaneously, reduce cost.The transformation of this moment by conversion equipment, just can be with baseband pool/base station/near-end machine normal communication.And the interface of baseband pool/base station/near-end machine do not need with the interface quantity of RF remote correspondingly one by one yet, even will use a large amount of RF remotes to carry out networking, the interface quantity of baseband pool/base station/near-end machine also can be seldom.Simultaneously, because the flexible configuration of conversion equipment internal module and the flexible configuration of interface hardware make networking mode more flexible.
As shown in Figure 3, this is a kind of function diagram of conversion equipment.When RF remote that conversion equipment connect belongs to different sub-district, adopt this function diagram to realize.For upward signal, at first in electrical interface 1, finish the level conversion that LVDS changes TTL, and decode according to 8B/10B or 10B/12B coded format, finish string and conversion.The parallel I Q/ digital signal that obtains is carried out multiplexing in Multiplexing module.High Speed I Q/ digital signal after multiplexing is carried out 8B/10B or 10B/12B form coding by electrical interface 2, and TTL changes the LVDS level conversion.If the back level requires the output light signal, then add photoelectric conversion module in electrical interface 2 back, finish opto-electronic conversion.For downstream signal, at first select whether use photoelectric conversion module according to the prime needs, from light signal, extract data-signal.Realize in electrical interface 2 that then LVDS changes the decoding of Transistor-Transistor Logic level and 8B/10B or 10B/12B coded format.The IQ/ numeral parallel signal that obtains after the decoding is sent into demultiplexing module, extracts each road IQ/ digital signal, carries out 8B/10B or 10B/12B form coding and TTL by electrical interface 1 and changes the LVDS level conversion, sends into N RF remote unit.If it is there is M interface the conversion equipment back, then in the multiplex/demultiplex module that N RF remote unit/previous stage conversion equipment and M baseband pool/base station/near-end machine unit/back one-level conversion equipment is corresponding one by one.Surveillance center among Fig. 3 monitors other each module; Clock module is used for providing clock to each module except that supply module; Supply module is used for providing power supply to other each module.Because these several modules are public parts of this conversion equipment, line is too many, has omitted corresponding annexation here.
As shown in Figure 4, this is the function diagram two of conversion equipment.When RF remote that conversion equipment connect belongs to same sub-district, adopt this function diagram to realize.For upward signal, at first in electrical interface 1, finish the level conversion that LVDS changes TTL, and decode according to 8B/10B or 10B/12B coded format, finish string and conversion.The parallel I Q/ digital signal that obtains is closed in the module of road in numeral and is closed the road, close the road after speed constant.The IQ/ digital signal of closing behind the road is carried out 8B/10B or 10B/12B form coding by electrical interface 2, and TTL changes the LVDS level conversion.If the back level requires the output light signal, then add photoelectric conversion module in electrical interface 2 back, finish opto-electronic conversion.For downstream signal, at first select whether use photoelectric conversion module according to the prime needs, from light signal, extract data-signal.Realize in electrical interface 2 that then LVDS changes the decoding of Transistor-Transistor Logic level and 8B/10B or 10B/12B coded format.The IQ/ numeral parallel signal that obtains after the decoding is sent into distribution module, obtains the identical IQ/ digital signal in each road, carries out 8B/10B or 10B/12B form coding and TTL by electrical interface 1 and changes the LVDS level conversion, sends into N RF remote unit.If there is M interface the conversion equipment back, then close in road/distribution module N RF remote/previous stage conversion equipment and M baseband pool/base station/near-end machine/back one-level conversion equipment is corresponding one by one in numeral.Surveillance center among Fig. 4 monitors other each module; Clock module is used for providing clock to each module except that supply module; Supply module is used for providing power supply to other each module.Same Fig. 3, because these several modules are public parts of this conversion equipment, line is too many, has omitted corresponding annexation here.
As shown in Figure 5, this is the function diagram three of conversion equipment.The RF remote that conversion equipment connect partly belongs to same sub-district, part belongs to the situation of different districts, adopts this function diagram to realize.For upward signal, at first in electrical interface 1, finish the level conversion that LVDS changes TTL, and decode according to 8B/10B or 10B/12B coded format, finish string and conversion.The parallel I Q/ digital signal of the same sub-district that obtains is sent into numeral and is closed in the module of road and close the road, obtains the new IQ/ digital signal in this sub-district, close the road after speed constant.Each sub-district IQ/ digital signal of closing behind the road is sent into Multiplexing Unit, carries out multiplexing.The signal of telecommunication after multiplexing carries out 8B/10B or 10B/12B form coding by electrical interface 2, and TTL changes the LVDS level conversion.If the back level requires the output light signal, then add photoelectric conversion module in electrical interface 2 back, finish opto-electronic conversion.For downstream signal, at first select whether use photoelectric conversion module according to the prime needs, from light signal, extract data-signal.Realize in electrical interface 2 that then LVDS changes the decoding of Transistor-Transistor Logic level and 8B/10B or 10B/12B coded format.The IQ/ numeral parallel signal that obtains after the decoding is sent into demultiplexing module, obtains the IQ/ digital signal of each road different districts.For the IQ/ digital signal of same sub-district, send into Dispatching Unit, obtain identical IQ/ digital signal and send into each electrical interface 1.Carry out 8B/10B or 10B/12B form coding and TTL by electrical interface 1 and change the LVDS level conversion, send into N RF remote unit.If there is M interface the conversion equipment back, then close in road/distribution and the multiplex/demultiplex module N RF remote/previous stage conversion equipment and M baseband pool/base station/near-end machine/back one-level conversion equipment is corresponding one by one in numeral.Surveillance center among Fig. 5 monitors other each module; Clock module is used for providing clock to each module except that supply module; Supply module is used for providing power supply to other each module.Same Fig. 3, because these several modules are public parts of this conversion equipment, line is too many, has omitted corresponding annexation here.
Claims (7)
1. the employed conversion equipment of RF remote compartment system in the communication system comprises: an end communication interface links to each other with one group of RF remote or upper level conversion equipment, other end communication interface and back one-level conversion equipment or modular converter that baseband pool/base station/the near-end machine links to each other; To each module initialization, and on carrying out/control centre of subordinate's module monitors and alarm; For other each modules provide work clock, guarantee the clock module of other each certain piece clock synchronizations; Guarantee that this installs the supply module of each module operate as normal;
Wherein, one group of signal of telecommunication of modular converter received RF far-end or upper level conversion equipment, and, send to back one-level conversion equipment or baseband pool/base station/near-end machine with another group signal of telecommunication of described one group of electrical signal conversion Cheng Yuhou one-level conversion equipment or baseband pool/base station/near-end machine transmission rate coupling; Described modular converter also receives another group signal of telecommunication of back one-level conversion equipment or baseband pool/base station/near-end machine transmission, and convert one group of signal of telecommunication with RF remote or upper level conversion equipment rate-matched to, send to RF remote or upper level conversion equipment.
2. the employed conversion equipment of RF remote compartment system in the communication system according to claim 1, it is characterized in that: described modular converter is the multiplex/demultiplex module, perhaps numeral is closed road/distribution module, and perhaps Chuan Lian multiplex/demultiplex module and numeral closed road/distribution module.
3. the employed conversion equipment of RF remote compartment system in the communication system according to claim 1 is characterized in that: be in series with first electrical interface that is used to mate the signal of telecommunication between RF remote or upper level conversion equipment and the modular converter between RF remote or upper level conversion equipment and the modular converter; Be in series with second electrical interface that is used to mate the signal of telecommunication between modular converter and back one-level conversion equipment or the baseband pool/base station/near-end machine between modular converter and back one-level conversion equipment or the baseband pool/base station/near-end machine.
4. the employed conversion equipment of RF remote compartment system in the communication system according to claim 3 is characterized in that: the signal of telecommunication of described first electrical interface is the low speed signal of telecommunication, and the described low speed signal of telecommunication is the signal of telecommunication that speed is lower than 1200 megahertzes.
5. the employed conversion equipment of RF remote compartment system in the communication system according to claim 4 is characterized in that: be in series with photoelectric conversion module between second electrical interface and back one-level conversion equipment or the baseband pool/base station/near-end machine.
6. the employed conversion equipment of RF remote compartment system in the communication system according to claim 5 is characterized in that: described first electrical interface and/or second electrical interface are Category-5 twisted pairs.
7. the employed conversion equipment of RF remote compartment system in the communication system according to claim 1 is characterized in that: described RF remote be the radio frequency in the radio frequency stretch system zoom out or digital optical fiber direct station in remote termination.
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| CN106487519B (en) * | 2015-09-02 | 2020-07-07 | 中兴通讯股份有限公司 | Communication equipment connection method and system and optical interface rate conversion equipment |
| CN108243493A (en) * | 2016-12-26 | 2018-07-03 | 中兴通讯股份有限公司 | A kind of device and method of antenna data packetizing transmission |
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Application publication date: 20080423 |