CN101841935A - Single-antenna remote radio unit - Google Patents
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Abstract
The invention discloses a single-antenna RRU (remote radio unit) comprising one or a plurality of radio-frequency far ends and an IR processing unit, wherein each radio-frequency far end is connected with an antenna, a received uplink analog radio-frequency signal is processed into an uplink digital intermediate-frequency signal, the uplink digital intermediate-frequency signal is transmitted to the IR processing unit, a downlink digital intermediate-frequency signal from the IR processing unit is received and is processed into a downlink analog radio-frequency signal, and the downlink analog radio-frequency signal is transmitted to the antenna. Simple protocol transmission is adopted between the radio-frequency far ends and the IR processing unit. The IR processing unit processes the uplink digital intermediate-frequency signal from each radio-frequency far end into an uplink digital baseband signal, the uplink digital baseband signal is transmitted to a BBU, a downlink digital baseband signal from the BBU is processed into a downlink digital intermediate-frequency signal, and the downlink digital intermediate-frequency signal is transmitted by selecting one of all the radio-frequency far ends. By adopting the single-antenna RRU, a plurality of radio-frequency far ends can be adopted to carry out coverage, so that the transmission capacity of the RRU can be expanded.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of single-antenna remote radio unit (RRU) that is applied in TD SDMA (TD-SCDMA) system and time-division Long Term Evolution (TD-LTE) system.
Background technology
At present, in TD-SCDMA system and TD-LTE system, RRU commonly used and baseband processing unit (BBU) are formed the distributed base station framework.Fig. 1 is existing single antenna RRU structural representation.As shown in Figure 1, a BBU connects one or more RRU, and connecting two RRU with BBU among Fig. 1 is example, is connected by optical fiber between BBU and the RRU, correspondingly, includes the optical transceiver that is connected optical fiber among BBU and the RRU.A RRU connects an antenna, and the equipment of RRU is positioned at indoor, is connected with antenna by long feeder line, in feeder line connects, can adopt amplifier, splitter etc. as required.
Referring to Fig. 1, comprise at least among the existing RRU: interface (IR) interface unit, processor unit and clock unit between analog radio frequency unit, digital intermediate frequency unit, RRU and the BBU, above-mentioned each unit is arranged in same equipment.Wherein, IR represents the interface between RRU and the BBU.
Referring to Fig. 1, analog radio frequency unit comprises: multi-frequency band radio-frequency band pass filter, circulator, up link, down link and clock, uplink downlink converges at circulator, circulator passes through the multi-frequency band radio-frequency band pass filter and is connected to the RRU device external, links to each other with antenna by the feeder line of growing distance.Up link comprises successively: low noise amplifier (LNA), frequency mixer, if bandpas filter, variable gain amplifier and analog to digital converter (ADC), amplify, filtering, downconvert to intermediate frequency, gain-adjusted and analog-to-digital conversion the radiofrequency signal of up reception.Down link comprises successively: digital to analog converter (DAC), if bandpas filter, frequency mixer, variable gain amplifier, radio frequency band filter and power amplifier (PA), carry out digital-to-analogue conversion, filtering, up-conversion to radio frequency, gain-adjusted and amplification to the intermediate-freuqncy signal of descending transmission.And in order to realize digital pre-distortion (DPD) function, analog radio frequency unit also needs the radiofrequency signal of downlink is fed back, and need comprise independently based on feedback link or utilize existing down link to feed back.
The digital intermediate frequency unit comprises: to the upward signal from analog radio frequency unit carry out Digital Down Convert (DDC) the DDC module, treat the DUC module that the downstream signal that sends to analog radio frequency unit carries out Digital Up Convert (DUC), and be used for to the upward signal after the DDC and etc. the data buffering pond cushioned of the downstream signal of pending DUC.
The IR interface unit comprises IR protocol process module, two serial parallel and serializer and two optical transceivers, the IR protocol process module finishes the parsing of the IR agreement between RRU and the BBU and base band data is handled, and communicates by serial parallel and serializer and optical transceiver and BBU.
Among the single antenna RRU of TD-SCDMA system, single pass radiofrequency signal is only handled in each IR interface unit and Digital IF Processing unit, so transmission capacity is little at present, thereby at the customer service close quarters, needs to use a plurality of RRU just can finish covering.And, because present single antenna RRU is connected with antenna by the feeder line of long distance, the power loss of feeder line is exponential increase with length, so RRU need export powerful downstream signal, the power that present RRU exports antenna to is 20W, adopts present RRU power consumption bigger.Therefore, when using a plurality of RRU to cover, strengthened equipment power dissipation more, increased equipment cost simultaneously at the customer service close quarters.In a word, the transmission capacity of present single antenna RRU is little, and power loss is big.
Summary of the invention
The invention provides a kind of single antenna RRU, use this RRU can enlarge transmission capacity, reduce power loss.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of single-antenna remote radio unit RRU, comprising: one or more RF remotes and an IR processing unit;
Described each RF remote, be used to receive up analog radio-frequency signal from antenna, amplify, filtering, down-conversion, gain-adjusted, analog-to-digital conversion, simple protocol coding and and the string conversion, obtain the upstream digital intermediate-freuqncy signal and send to the IR processing unit, and, reception is from the descending digital medium-frequency signal of IR processing unit, go here and there and conversion, simple protocol parsing, digital-to-analogue conversion, up-conversion, gain-adjusted, filtering and amplification, obtain descending analog radio-frequency signal and send to antenna;
Described IR processing unit, be used to receive upstream digital intermediate-freuqncy signal from each RF remote, carry out simple protocol parsing, Digital Down Convert, IR protocol processes and string and conversion, obtain the upstream digital baseband signal and send to baseband processing unit BBU, and, receive descending digital baseband signal from BBU, carry out and go here and there conversion, IR protocol processes, Digital Up Convert and simple protocol encoding, obtain descending digital medium-frequency signal, and select a RF remote to send.
Described RF remote comprises:
The radio-frequency antenna filter is used to receive the up analog radio-frequency signal from antenna, carries out sending circulator to after the filtering, and, receive from the descending analog radio-frequency signal of circulator and send antenna to;
Circulator is used to receive from the up analog radio-frequency signal of radio-frequency antenna filter and sends up low noise amplifier LNA to, and, receive from the descending analog radio-frequency signal of the amplification of downlink power amplifier PA and send the radio-frequency antenna filter to;
Up LNA is used to receive the up analog radio-frequency signal from circulator, sends up radio-frequency filter after amplifying to;
Up radio-frequency filter is used to receive the up analog radio-frequency signal from the amplification of up LNA, carries out sending upstream mixer to after the filtering;
Upstream mixer, be used to receive filtered up analog radio-frequency signal from up radio-frequency filter, the local frequency signal that provides according to local oscillator generator carries out down-conversion to up analog radio-frequency signal, obtains up analog intermediate frequency signal and sends to up intermediate-frequency filter;
Up intermediate-frequency filter is used to receive the up analog intermediate frequency signal from upstream mixer, carries out sending up variable gain amplifier to after the filtering;
Up variable gain amplifier is used to receive the filtered up analog intermediate frequency signal from up intermediate-frequency filter, carries out sending to analog to digital converter ADC after the gain-adjusted;
ADC is used to receive the up analog if signal from up variable gain amplifier, carries out obtaining the upstream digital intermediate-freuqncy signal and sending to the simple protocol processing module after the analog-to-digital conversion;
Digital to analog converter DAC is used to receive the descending digital medium-frequency signal from the simple protocol processing module, carries out obtaining descending analog if signal and sending to descending intermediate-frequency filter after the digital-to-analogue conversion;
Descending intermediate-frequency filter is used to receive the descending analog if signal from DAC, carries out sending downstream mixer to after the filtering;
Downstream mixer, be used to receive filtered descending analog if signal from descending intermediate-frequency filter, the local frequency signal that provides according to local oscillator generator carries out up-conversion to descending analog if signal, obtains descending analog radio-frequency signal and sends to descending variable gain amplifier;
Descending variable gain amplifier is used to receive the descending analog radio-frequency signal from downstream mixer, carries out sending to the downlink radio frequency filter after the gain-adjusted;
The downlink radio frequency filter is used to receive the descending analog radio-frequency signal from after the gain-adjusted of descending variable gain amplifier, carries out sending descending PA to after the filtering;
Descending PA is used to receive the filtered descending analog radio-frequency signal from the downlink radio frequency filter, sends circulator to after amplifying;
The simple protocol processing module, be used to receive up digital intermediate frequency signal from ADC, send parallel series and staticizer to after according to simple protocol up digital intermediate frequency signal being encoded, and, reception is from the descending digital medium-frequency signal of parallel series and staticizer, sends DAC to after according to simple protocol descending digital medium-frequency signal being resolved;
Parallel series and staticizer SERDES, be used to receive up digital intermediate frequency signal from the simple protocol processing module, carry out and go here and there the conversion after send to the IR processing unit, and, reception is from the descending digital medium-frequency signal of IR processing unit, go here and there and change after send to the simple protocol processing module;
Local oscillator generator is used for providing the local frequency signal to upstream mixer and downstream mixer;
Processor is used to manage the operation and maintenance O﹠amp of this RF remote; M information is also carried out hardware driving to this RF remote.
Described simple protocol processing module, send parallel series and staticizer to after being further used for up alarm management information encoded, and, receive downstream arrangements management information from parallel series and staticizer, send microprocessor to after resolving;
Described SERDES, be further used for receiving up alarm management information from the simple protocol processing module, carry out and go here and there the conversion after send to the IR processing unit, and, reception is from the downstream arrangements management information of IR processing unit, go here and there and change after send to the simple protocol processing module.
Described IR processing unit comprises:
One or more simple protocol processing modules, each simple protocol processing module receives the upstream digital intermediate-freuqncy signal from the RF remote of a correspondence, carry out sending to after simple protocol is resolved the Digital Down Converter Module DDC of a correspondence, and, control according to processor is selected descending digital medium-frequency signal by DUC from the data buffering pond, reception carries out sending to after simple protocol is encoded the RF remote of a correspondence from the descending digital medium-frequency signal of the Digital Up Convert module DUC of a correspondence;
One or more DDC, each DDC receives from the upstream digital intermediate-freuqncy signal after the parsing of the simple protocol processing module of a correspondence, carries out sending the data buffering pond to after the Digital Down Convert;
One or more DUC, each DUC receives the descending digital medium-frequency signal from the data buffering pond, carries out sending to after the Digital Up Convert simple protocol processing module of a correspondence;
A data Buffer Pool, be used to receive upstream digital intermediate-freuqncy signal from after the simple protocol parsing of all Digital Down Converter Module, selection according to the IR protocol process module sends the upstream digital intermediate-freuqncy signal to corresponding IR protocol process module, and, reception sends descending digital medium-frequency signal to by the selection of DUC the DUC of correspondence from the descending digital medium-frequency signal of all IR protocol process module according to the simple protocol processing module;
One or more IR protocol process module, each IR protocol process module is selected the upstream digital intermediate-freuqncy signal according to the control of processor from the data buffering pond, carry out obtaining the upstream digital baseband signal after the IR protocol code, and send the parallel series and the staticizer of a correspondence to, and, reception is carried out obtaining descending digital medium-frequency signal behind the IR protocol analysis, and is sent the data buffering pond to from the parallel series of a correspondence and the descending digital baseband signal of staticizer;
One or more parallel series and staticizer SERDES, each parallel series and the upstream digital baseband signal of staticizer reception from a corresponding IR protocol process module, go here and there and change after send BBU to, and, reception is from the descending digital baseband signal of BBU, carries out and goes here and there the IR protocol process module that sends a correspondence after the conversion to;
A processor is used to manage the O﹠amp of this RRU; M information is also carried out hardware driving to this IR processing unit, control each IR protocol process module and from the data buffering pond, select the upstream digital intermediate-freuqncy signal, and control each simple protocol processing module and from the data buffering pond, select descending digital medium-frequency signal by DUC.
All further comprise in described each RF remote and the IR processing unit: phase-locked loop module and de-twitter circuit module;
Described IR processing unit further obtains the first recovered clock signal from BBU, after the de-twitter circuit module of process IR processing unit locks for the first time to the first recovered clock signal, the phase-locked loop module of input IR processing unit locks once more, produces IR processing unit clock signal;
Described each RF remote further obtains the second recovered clock signal from the IR processing unit, after the de-twitter circuit module of process RF remote locks for the first time to the first recovered clock signal, the phase-locked loop module of input radio frequency far-end locks once more, produces the RF remote clock signal.
All further comprise in described each RF remote and the IR processing unit:
TDD timing recovery module is used for recovering RF remote and IR processing unit TDD Um interface timeslot.
Described one or more RF remote is arranged in a RRU equipment, and described IR processing unit is arranged in the 2nd RRU equipment;
Described each RF remote is connected with described IR processing unit by a boundling cable, comprises optical fiber in the described boundling cable, is used for RF remote and IR processing unit transmission data and control messages;
All further comprise in described each RF remote and the IR processing unit: optical transceiver is used for sending or receive data and/or control messages by optical fiber.
Up-downgoing transmission signals bit wide between described RF remote and the IR processing unit is 16 bits, and wherein, the data-signal bit wide is 15 bits, O﹠amp; M signal bit wide is 1 bit.
Described IR processing unit, be further used for sending descending latency measurement message to RF remote, and reception is measured the propagation delay time that message is measured optical fiber in the boundling cable from the uplink time delay measurement message of RF remote according to descending latency measurement message and uplink time delay;
Described RF remote is further used for receiving the descending latency measurement message from the IR processing unit, and sends uplink time delay measurement message at next ascending time slot to the IR processing unit.
Further comprise power line in the described boundling cable, be used for the IR processing unit and power to RF remote; Described RF remote further comprises power module, is used to receive the electric current from the IR processing unit, carries out transformation and/or rectification and handles the power supply of back as RRU.
By above summary of the invention as seen, in single antenna RRU, comprise a plurality of RF remotes and a shared IR processing unit, a plurality of RF remotes are integrated among the RRU, so increased the transmission capacity of RRU, only need to adopt a RRU can finish covering in the dense traffic zone, therefore reduced power loss and equipment volume, thereby effectively raised the covering power of RRU and cover efficient.
Description of drawings
Fig. 1 is the structural representation of existing single antenna RRU;
Fig. 2 is the structural representation of the single antenna RRU of the embodiment of the invention;
Fig. 3 is embodiment of the invention RF remote 21 internal structure schematic diagrames;
Fig. 4 is embodiment of the invention IR processing unit 22 internal structure schematic diagrames;
Fig. 5 is the data transmission format schematic diagram between embodiment of the invention IR processing unit 22 and the RF remote 21;
Fig. 6 is the latency measurement schematic diagram between embodiment of the invention IR processing unit 22 and the RF remote 21.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Basic thought of the present invention is that each single antenna RRU is made up of two autonomous devices, comprises one or more RF remotes and an IR processing unit.Wherein, a plurality of RF remotes are arranged in an autonomous device, and this equipment places antenna side, and each RF remote connects an antenna.The IR processing unit is arranged in another autonomous device, and this equipment is positioned at indoor.Connect by the boundling cable between above-mentioned two equipment, form a RRU jointly by above-mentioned two equipment.
Fig. 2 is the structural representation of the single antenna RRU of the embodiment of the invention.As shown in Figure 2, the single antenna RRU of the embodiment of the invention comprises: one or more RF remotes 21 and an IR processing unit 22.
The up analog radio-frequency signal that each RF remote 21 receives from antenna, amplify, filtering, down-conversion, gain-adjusted, analog-to-digital conversion, simple protocol coding and and the string conversion, obtain the upstream digital intermediate-freuqncy signal and send to IR processing unit 22.And, receive descending digital medium-frequency signal from IR processing unit 22, go here and there and conversion, simple protocol parsing, digital-to-analogue conversion, up-conversion, gain-adjusted, filtering and amplification, obtain descending analog radio-frequency signal and send to antenna.
The upstream digital intermediate-freuqncy signal that IR processing unit 22 receives from each RF remote 21 is carried out simple protocol parsing, Digital Down Convert, IR protocol processes and string and conversion, obtains the upstream digital baseband signal and sends to BBU.And IR processing unit 22 receives the descending digital baseband signal from BBU, carries out and go here and there conversion, IR protocol processes, Digital Up Convert and simple protocol encoding, and obtains descending digital medium-frequency signal, and selects a RF remote 21 to send.
In the present embodiment, to comprise among the single antenna RRU that n RF remote 21 is example.All RF remotes 21 are arranged in a RRU equipment, and in actual applications, a RRU equipment is positioned at antenna side, and each RF remote 21 connects an antenna, and each RF remote 21 is connected with IR processing unit 22 by a boundling cable.Comprise optical fiber in this boundling cable, be used for transmission data and control command between RF remote 21 and IR processing unit 22.A kind of preferred implementation is, also comprises power line in this boundling cable, and it is RF remote 21 power supplies that IR processing unit 22 adopts these power lines.IR processing unit 22 is connected by a boundling cable respectively with each RF remote 21, and IR processing unit 22 links to each other with BBU by one or more optical fiber.
Referring to Fig. 2, each IR processing unit 22 links to each other with one or more RF remotes 21, and has one or more optical fiber interfaces that are connected with BBU.Therefore, the data of a RF remote 21 can be mapped to the optical fiber interface of a plurality of BBU by IR processing unit 22, and the data of a BBU optical fiber interface also can be distributed to a plurality of RF remotes 21 by IR processing unit 22.And different BBU also can use same IR processing unit to insert RRU, therefore can make different mobile communication service providers share same group of RRU equipment.
Fig. 3 is embodiment of the invention RF remote 21 internal structure schematic diagrames.As shown in Figure 3, the RF remote 21 of the embodiment of the invention comprises at least: circulator 2102, upstream mixer 2105, analog to digital converter (ADC) 2108, digital to analog converter (DAC) 2109, downstream mixer 2111, local oscillator generator 2115, simple protocol processing module 2116, parallel series and staticizer (SERDES) 2117 and processor 2118.A kind of preferred implementation is that the RF remote 21 of the embodiment of the invention also comprises: radio-frequency antenna filter 2101, up low noise amplifier (LNA) 2103, up radio-frequency filter 2104, up intermediate-frequency filter 2106, up variable gain amplifier 2107, descending intermediate-frequency filter 2110, descending variable gain amplifier 2112, downlink radio frequency filter 2113 and downlink power amplifier (PA) 2114.Below the internal structure of RF remote 21 is elaborated, referring to Fig. 3.
Wherein, radio-frequency antenna filter 2101 receives the up analog radio-frequency signal from antenna, carry out sending circulator 2102 to after the filtering, and, receive from the descending analog radio-frequency signal of circulator 2102 and send antenna to.
The up analog radio-frequency signal that up LNA 2103 receives from circulator 2102 sends up radio-frequency filter 2104 to after amplifying.
The up analog radio-frequency signal that up radio-frequency filter 2104 receives from the amplification of up LNA 2103 carries out sending upstream mixer 2105 to after the filtering.
The filtered up analog radio-frequency signal that upstream mixer 2105 receives from up radio-frequency filter 2104, the local frequency signal that provides according to local oscillator generator 2115 carries out down-conversion to up analog radio-frequency signal, obtains up analog intermediate frequency signal and sends to up intermediate-frequency filter 2106.
The up analog intermediate frequency signal that up intermediate-frequency filter 2106 receives from upstream mixer 2105 carries out sending up variable gain amplifier 2107 to after the filtering.
The filtered up analog intermediate frequency signal that up variable gain amplifier 2107 receives from up intermediate-frequency filter 2106 carries out sending to ADC 2108 after the gain-adjusted.
The up analog if signal that ADC 2108 receives from up variable gain amplifier 2107 carries out obtaining the upstream digital intermediate-freuqncy signal and sending to simple protocol processing module 2116 after the analog-to-digital conversion.
The descending digital medium-frequency signal that DAC 2109 receives from simple protocol processing module 2116 carries out obtaining descending analog if signal and sending to descending intermediate-frequency filter 2110 after the digital-to-analogue conversion.
The descending analog if signal that descending intermediate-frequency filter 2110 receives from DAC 2109 carries out sending downstream mixer 2111 to after the filtering.
The filtered descending analog if signal that downstream mixer 2111 receives from descending intermediate-frequency filter 2110, the local frequency signal that provides according to local oscillator generator 2115 carries out up-conversion to descending analog if signal, obtains descending analog radio-frequency signal and sends to descending variable gain amplifier 2112.
The descending analog radio-frequency signal that descending variable gain amplifier 2112 receives from downstream mixer 2111 carries out sending to downlink radio frequency filter 2113 after the gain-adjusted.
Downlink radio frequency filter 2113 receives from the descending analog radio-frequency signal after the gain-adjusted of descending variable gain amplifier 2112, carries out sending descending PA 2114 to after the filtering.
The filtered descending analog radio-frequency signal that descending PA 2114 receives from downlink radio frequency filter 2113 sends circulator 2102 to after amplifying.
The up digital intermediate frequency signal that simple protocol processing module 2116 receives from ADC 2108, send SERDES2117 to after according to simple protocol up digital intermediate frequency signal being encoded, and, reception is from the descending digital medium-frequency signal of SERDES 2117, sends DAC 2109 to after according to simple protocol descending digital medium-frequency signal being resolved.Further, after encoding, 2116 pairs of up alarm management information of simple protocol processing module send SERDES 2117 to, and, receive downstream arrangements management information from SERDES 2117, send processor 2118 after resolving to.Simple protocol processing module 2116 can adopt field programmable gate array (FGPA) to realize.Processor 2118 is relevant operation and maintenance (O﹠amp; M) information is issued FGPA, and FGPA is according to simple protocol, and this information is mixed the space of data, reaches the purpose that transmits between RF remote 21 and IR processing unit 22.
The up digital intermediate frequency signal that SERDES 2117 receives from simple protocol processing module 2116, carry out and go here and there the conversion after send to IR processing unit 22, and, receive descending digital medium-frequency signal from IR processing unit 22, go here and there and change after send to simple protocol processing module 2116.Further, reception is from the up alarm management information of simple protocol processing module 2116, carries out and goes here and there sending to IR processing unit 22 after the conversion, and, reception is from the downstream arrangements management information of IR processing unit 22, go here and there and change after send to simple protocol processing module 2116.
The O﹠amp of processor 2118 management these RF remotes 21; M information is also carried out hardware driving to this RF remote 21.
Further, also comprise in each RF remote 21: de-twitter circuit module 2119 and phase-locked loop module (PLL) 2120.IR processing unit 22 obtains the first recovered clock signal and sends synchronizing clock signals to RF remote 21 by the optical fiber that comprises the boundling cable from BBU, SERDES 2117 in each RF remote 21 obtains the second recovered clock signal from IR processing unit 22, after 2119 pairs first recovered clock signals of de-twitter circuit module of second recovered clock signal process RF remote 21 lock for the first time, the PLL2120 of input radio frequency far-end 21, PLL 2120 locks once more, produce the clock signal of high stability, as RF remote 21 clock signals, promptly as the whole plate clock signal of RF remote 21, and be dispensed to each chips of RF remote 21 inside, for example ADC 2108, DAC 2109, local oscillator generator 2115, simple protocol processing module 2116 and SERDES 2117.
Further, also comprise in each RF remote 21: time division duplex (TDD) timing recovery module 2121, link to each other with simple protocol processing module 2116, be used for recovering RF remote 21 TDD Um interface timeslots.TDD timing recovery module 2121 also can adopt FGPA to realize.
Further, in a kind of better embodiment, above-mentioned RF remote 21 is arranged in a RRU equipment, the one RRU equipment is positioned at antenna side, adopt integrated design with antenna, every antenna adopts extremely short feeder line to be connected with RF remote 21, each RF remote 21 is connected with described IR processing unit 22 by a boundling cable, therefore also comprise an optical transceiver 2122 in each RF remote 21, optical transceiver 2122 connects SERDES 2117 and comprises the boundling cable of optical fiber, sends or receive data and/or control messages by optical fiber.
Further, in a kind of better embodiment, also comprise power line in the boundling cable, IR processing unit 22 adopts this power line to RF remote 21 power supplies.Correspondingly, further comprise power module 2123 in the RF remote 21, the electric current that power module 2123 receives from IR processing unit 22 carries out transformation and/or rectification and handles the power supply of back as RRU.
Fig. 4 is embodiment of the invention IR processing unit 22 internal structure schematic diagrames.As shown in Figure 4, the IR processing unit 22 of the embodiment of the invention comprises at least: one or more simple protocol processing modules 2201, one or more Digital Down Converter Module (DDC) 2202,2203, data Buffer Pools 2204 of one or more Digital Up Convert module (DUC), one or more IR protocol process module 2205, one or more SERDES 2206 and a processor 2207.Below the internal structure of IR processing unit 22 is elaborated, referring to Fig. 4.Wherein, simple protocol processing module 2201, DDC 2202, DUC2203, data buffering pond 2204 and IR protocol process module 2205 adopt FGPA to realize.
In one or more simple protocol processing modules 2201, the upstream digital intermediate-freuqncy signal that each simple protocol processing module 2201 receives from the RF remote 21 of a correspondence, carry out sending to after simple protocol is resolved the DDC 2202 of a correspondence, and, control according to processor 2207 is selected descending digital medium-frequency signal by DUC 2203 from data buffering pond 2204, reception carries out sending to after simple protocol is encoded the RF remote 21 of a correspondence from the descending digital medium-frequency signal of the DUC 2203 of a correspondence.Further, simple protocol processing module 2201 receives the management and the monitoring information to RF remote 21 of from processor 2207, carries out sending corresponding RF remote 21 to behind the simple protocol coding.Simple protocol processing module 2201 also can adopt FGPA to realize.Processor 2207 is relevant O﹠amp; M information is issued FGPA, and FGPA is according to simple protocol, and this information is mixed the space of data, reaches the purpose that transmits between RF remote 21 and IR processing unit 22.
In one or more DDC 2202, each DDC 2202 receives from the upstream digital intermediate-freuqncy signal after the parsing of the simple protocol processing module 2201 of a correspondence, carries out sending data buffering pond 2204 to after the Digital Down Convert.
In one or more DUC 2203, the descending digital medium-frequency signal that each DUC 2203 receives from data buffering pond 2204 carries out sending to after the Digital Up Convert simple protocol processing module 2201 of a correspondence.
In one or more IR protocol process module 2205, each IR protocol process module 2205 is selected the upstream digital intermediate-freuqncy signal according to the control of processor 2207 from data buffering pond 2204, carry out obtaining the upstream digital baseband signal after the IR protocol code, and send the SERDES 2206 of a correspondence to, and, reception is carried out obtaining descending digital medium-frequency signal behind the IR protocol analysis, and is sent data buffering pond 2204 to from the descending digital baseband signal of the SERDES 2206 of a correspondence.The number of the IR protocol process module 2205 in the embodiment of the invention can be adjusted according to the processing speed of RRU transmission capacity and IR protocol process module 2205, needn't require identical with the number of RF remote 21, as long as can finish the IR protocol processes.
In one or more SERDES 2206, each parallel series and the upstream digital baseband signal of staticizer reception from a corresponding IR protocol process module 2205, go here and there and change after send BBU to, and, reception is from the descending digital baseband signal of BBU, carries out and goes here and there the IR protocol process module 2205 that sends a correspondence after the conversion to.In embodiments of the present invention, with 2 SERDES 2206 is example, in concrete the application, can also adjust the number of SERDES 2206, when RRU works, can carry out the up-downgoing transfer of data simultaneously by all SERDES2206, also can adopt a part of SERDES 2206 to carry out the up-downgoing transfer of data simultaneously, another part SERDE S 2206 is as backup.
The O﹠amp of processor 2207 these RRU of management; M information is also carried out hardware driving to this IR processing unit 22, control each IR protocol process module 2205 and from data buffering pond 2204, select the upstream digital intermediate-freuqncy signal, and control each simple protocol processing module 2201 and from data buffering pond 2204, select descending digital medium-frequency signal by DUC2203.Further, management and monitoring information that processor 2207 generates RF remote 21, control the dynamic-configuration and the local operation of the carrier wave of each RF remote 21 and safeguard and research and develop test, and control simple protocol processing module 2201 will be synthetic from the data that BBU receives by a plurality of different fiber, send corresponding RF remote 21 to.
Further, also comprise in the IR processing unit 22: de-twitter circuit module 2208 and PLL2209.The SERDES 2206 of IR processing unit 22 obtains the first recovered clock signal from BBU, after the first recovered clock signal is removed the first locking of shake through the de-twitter circuit module 2208 of IR processing unit 22, the PLL 2209 of input IR processing unit 22, PLL 2209 locks once more, produce the clock signal of high stability, as IR processing unit 22 clock signals,, and be dispensed to each chips of IR processing unit 22 inside promptly as the whole plate clock signal of IR processing unit 22.PLL 2209 also can adopt FGPA to realize.
Further, each IR processing unit 22 also comprises: TDD timing recovery module 2210, link to each other with IR protocol process module 2205, be used for producing the control signal of the TD time slot that satisfies third generation partner program (3GPP) requirement, recover TDD Um interface timeslot in the IR processing unit 22 according to the control information of main carrier.TDD timing recovery module 2210 also can adopt FGPA to realize.
Further, owing to be connected by optical fiber between RRU and the BBU, therefore also comprise one or more external optical transceivers 2212 in the IR processing unit 22, each external optical transceiver 2212 connects a SERDES 2206 and an optical fiber, this optical fiber is used for communicating by letter transmitting data information and O﹠amp between RRU and the BBU; M information.
Further, in a kind of better embodiment, above-mentioned IR processing unit 22 is connected with RF remote 21 by the boundling cable, therefore in each IR processing unit 22, also comprise one or more internal optical transceivers 2211, each internal optical transceiver 2211 connects a simple protocol processing module 2201 and a boundling cable that comprises optical fiber, sends or receive data and/or control messages by a boundling cable that comprises optical fiber.
When communicating by optical fiber between RF remote 21 and the IR processing unit 22, need to adopt the signal of consolidation form.Fig. 5 is the data transmission format schematic diagram between embodiment of the invention IR processing unit 22 and the RF remote 21.Referring to Fig. 5, a kind of better embodiment is, the total bit wide of up-downgoing transmission signals between RF remote 21 and the IR processing unit 22 is 16 bits (Bit), and wherein, the data-signal bit wide is 15 bits, operation and maintenance (O﹠amp; M) the signal bit wide is 1 bit.
And owing to communicate by optical fiber boundling cable between RF remote 21 and the IR processing unit 22, optical fiber boundling cable can cause propagation delay time, therefore need measure the propagation delay time between RF remote 21 and the IR processing unit 22.Fig. 6 is the latency measurement schematic diagram between embodiment of the invention IR processing unit 22 and the RF remote 21.Referring to Fig. 6, IR processing unit 22 sends descending latency measurement message to RF remote 21, the descending latency measurement message that RF remote 21 receives from IR processing unit 22, and send uplink time delays at next ascending time slot to IR processing unit 22 and measure message.IR processing unit 22 receives from the uplink time delay of RF remote 21 and measures message, measures the propagation delay time that message is measured optical fiber in the boundling cable according to descending latency measurement message and uplink time delay.
By above embodiment as seen, in single antenna RRU, comprise a plurality of RF remotes and a shared IR processing unit, because comprise a plurality of RF remotes, so increased the transmission capacity of RRU, and can carry out flexible configuration to RF remote, thereby effectively raise the covering power in dense traffic zone and cover efficient.And, because a plurality of RF remotes are positioned at antenna side as a separate equipment, adopt integrated design with antenna, and the IR processing unit is positioned at indoor as another separate equipment, RF remote is connected by boundling cable and distance IR processing unit far away, therefore shortened the feeder line that is connected between RRU and the antenna, reduced the power loss that feeder line causes, thereby reduced the power consumption and the volume of RRU equipment.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a single-antenna remote radio unit RRU is characterized in that, comprising: one or more RF remotes and an IR processing unit;
Described each RF remote, be used to receive up analog radio-frequency signal from antenna, amplify, filtering, down-conversion, gain-adjusted, analog-to-digital conversion, simple protocol coding and and the string conversion, obtain the upstream digital intermediate-freuqncy signal and send to the IR processing unit, and, reception is from the descending digital medium-frequency signal of IR processing unit, go here and there and conversion, simple protocol parsing, digital-to-analogue conversion, up-conversion, gain-adjusted, filtering and amplification, obtain descending analog radio-frequency signal and send to antenna;
Described IR processing unit, be used to receive upstream digital intermediate-freuqncy signal from each RF remote, carry out simple protocol parsing, Digital Down Convert, IR protocol processes and string and conversion, obtain the upstream digital baseband signal and send to baseband processing unit BBU, and, receive descending digital baseband signal from BBU, carry out and go here and there conversion, IR protocol processes, Digital Up Convert and simple protocol encoding, obtain descending digital medium-frequency signal, and select a RF remote to send.
2. RRU according to claim 1 is characterized in that, described RF remote comprises:
The radio-frequency antenna filter is used to receive the up analog radio-frequency signal from antenna, carries out sending circulator to after the filtering, and, receive from the descending analog radio-frequency signal of circulator and send antenna to;
Circulator is used to receive from the up analog radio-frequency signal of radio-frequency antenna filter and sends up low noise amplifier LNA to, and, receive from the descending analog radio-frequency signal of the amplification of downlink power amplifier PA and send the radio-frequency antenna filter to;
Up LNA is used to receive the up analog radio-frequency signal from circulator, sends up radio-frequency filter after amplifying to;
Up radio-frequency filter is used to receive the up analog radio-frequency signal from the amplification of up LNA, carries out sending upstream mixer to after the filtering;
Upstream mixer, be used to receive filtered up analog radio-frequency signal from up radio-frequency filter, the local frequency signal that provides according to local oscillator generator carries out down-conversion to up analog radio-frequency signal, obtains up analog intermediate frequency signal and sends to up intermediate-frequency filter;
Up intermediate-frequency filter is used to receive the up analog intermediate frequency signal from upstream mixer, carries out sending up variable gain amplifier to after the filtering;
Up variable gain amplifier is used to receive the filtered up analog intermediate frequency signal from up intermediate-frequency filter, carries out sending to analog to digital converter ADC after the gain-adjusted;
ADC is used to receive the up analog if signal from up variable gain amplifier, carries out obtaining the upstream digital intermediate-freuqncy signal and sending to the simple protocol processing module after the analog-to-digital conversion;
Digital to analog converter DAC is used to receive the descending digital medium-frequency signal from the simple protocol processing module, carries out obtaining descending analog if signal and sending to descending intermediate-frequency filter after the digital-to-analogue conversion;
Descending intermediate-frequency filter is used to receive the descending analog if signal from DAC, carries out sending downstream mixer to after the filtering;
Downstream mixer, be used to receive filtered descending analog if signal from descending intermediate-frequency filter, the local frequency signal that provides according to local oscillator generator carries out up-conversion to descending analog if signal, obtains descending analog radio-frequency signal and sends to descending variable gain amplifier;
Descending variable gain amplifier is used to receive the descending analog radio-frequency signal from downstream mixer, carries out sending to the downlink radio frequency filter after the gain-adjusted;
The downlink radio frequency filter is used to receive the descending analog radio-frequency signal from after the gain-adjusted of descending variable gain amplifier, carries out sending descending PA to after the filtering;
Descending PA is used to receive the filtered descending analog radio-frequency signal from the downlink radio frequency filter, sends circulator to after amplifying;
The simple protocol processing module, be used to receive up digital intermediate frequency signal from ADC, send parallel series and staticizer to after according to simple protocol up digital intermediate frequency signal being encoded, and, reception is from the descending digital medium-frequency signal of parallel series and staticizer, sends DAC to after according to simple protocol descending digital medium-frequency signal being resolved;
Parallel series and staticizer SERDES, be used to receive up digital intermediate frequency signal from the simple protocol processing module, carry out and go here and there the conversion after send to the IR processing unit, and, reception is from the descending digital medium-frequency signal of IR processing unit, go here and there and change after send to the simple protocol processing module;
Local oscillator generator is used for providing the local frequency signal to upstream mixer and downstream mixer;
Processor is used to manage the operation and maintenance O﹠amp of this RF remote; M information is also carried out hardware driving to this RF remote.
3. RRU according to claim 2 is characterized in that,
Described simple protocol processing module, send parallel series and staticizer to after being further used for up alarm management information encoded, and, receive downstream arrangements management information from parallel series and staticizer, send microprocessor to after resolving;
Described SERDES, be further used for receiving up alarm management information from the simple protocol processing module, carry out and go here and there the conversion after send to the IR processing unit, and, reception is from the downstream arrangements management information of IR processing unit, go here and there and change after send to the simple protocol processing module.
4. RRU according to claim 1 is characterized in that, described IR processing unit comprises:
One or more simple protocol processing modules, each simple protocol processing module receives the upstream digital intermediate-freuqncy signal from the RF remote of a correspondence, carry out sending to after simple protocol is resolved the Digital Down Converter Module DDC of a correspondence, and, control according to processor is selected descending digital medium-frequency signal by DUC from the data buffering pond, reception carries out sending to after simple protocol is encoded the RF remote of a correspondence from the descending digital medium-frequency signal of the Digital Up Convert module DUC of a correspondence;
One or more DDC, each DDC receives from the upstream digital intermediate-freuqncy signal after the parsing of the simple protocol processing module of a correspondence, carries out sending the data buffering pond to after the Digital Down Convert;
One or more DUC, each DUC receives the descending digital medium-frequency signal from the data buffering pond, carries out sending to after the Digital Up Convert simple protocol processing module of a correspondence;
A data Buffer Pool, be used to receive upstream digital intermediate-freuqncy signal from after the simple protocol parsing of all Digital Down Converter Module, selection according to the IR protocol process module sends the upstream digital intermediate-freuqncy signal to corresponding IR protocol process module, and, reception sends descending digital medium-frequency signal to by the selection of DUC the DUC of correspondence from the descending digital medium-frequency signal of all IR protocol process module according to the simple protocol processing module;
One or more IR protocol process module, each IR protocol process module is selected the upstream digital intermediate-freuqncy signal according to the control of processor from the data buffering pond, carry out obtaining the upstream digital baseband signal after the IR protocol code, and send the parallel series and the staticizer of a correspondence to, and, reception is carried out obtaining descending digital medium-frequency signal behind the IR protocol analysis, and is sent the data buffering pond to from the parallel series of a correspondence and the descending digital baseband signal of staticizer;
One or more parallel series and staticizer SERDES, each parallel series and the upstream digital baseband signal of staticizer reception from a corresponding IR protocol process module, go here and there and change after send BBU to, and, reception is from the descending digital baseband signal of BBU, carries out and goes here and there the IR protocol process module that sends a correspondence after the conversion to;
A processor is used to manage the O﹠amp of this RRU; M information is also carried out hardware driving to this IR processing unit, control each IR protocol process module and from the data buffering pond, select the upstream digital intermediate-freuqncy signal, and control each simple protocol processing module and from the data buffering pond, select descending digital medium-frequency signal by DUC.
5. according to any described RRU in the claim 1 to 4, it is characterized in that, all further comprise in described each RF remote and the IR processing unit: phase-locked loop module and de-twitter circuit module;
Described IR processing unit further obtains the first recovered clock signal from BBU, after the de-twitter circuit module of process IR processing unit locks for the first time to the first recovered clock signal, the phase-locked loop module of input IR processing unit locks once more, produces IR processing unit clock signal;
Described each RF remote further obtains the second recovered clock signal from the IR processing unit, after the de-twitter circuit module of process RF remote locks for the first time to the first recovered clock signal, the phase-locked loop module of input radio frequency far-end locks once more, produces the RF remote clock signal.
6. according to any described RRU in the claim 1 to 4, it is characterized in that, all further comprise in described each RF remote and the IR processing unit:
TDD timing recovery module is used for recovering RF remote and IR processing unit TDD Um interface timeslot.
7. RRU according to claim 1 is characterized in that,
Described one or more RF remote is arranged in a RRU equipment, and described IR processing unit is arranged in the 2nd RRU equipment;
Described each RF remote is connected with described IR processing unit by a boundling cable, comprises optical fiber in the described boundling cable, is used for RF remote and IR processing unit transmission data and control messages;
All further comprise in described each RF remote and the IR processing unit: optical transceiver is used for sending or receive data and/or control messages by optical fiber.
8. RRU according to claim 7 is characterized in that,
Up-downgoing transmission signals bit wide between described RF remote and the IR processing unit is 16 bits, and wherein, the data-signal bit wide is 15 bits, O﹠amp; M signal bit wide is 1 bit.
9. RRU according to claim 7 is characterized in that,
Described IR processing unit, be further used for sending descending latency measurement message to RF remote, and reception is measured the propagation delay time that message is measured optical fiber in the boundling cable from the uplink time delay measurement message of RF remote according to descending latency measurement message and uplink time delay;
Described RF remote is further used for receiving the descending latency measurement message from the IR processing unit, and sends uplink time delay measurement message at next ascending time slot to the IR processing unit.
10. RRU according to claim 7 is characterized in that,
Further comprise power line in the described boundling cable, be used for the IR processing unit and power to RF remote; Described RF remote further comprises power module, is used to receive the electric current from the IR processing unit, carries out transformation and/or rectification and handles the power supply of back as RRU.
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