CN101841935B - 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) composition distribution-type base station architecture.Fig. 1 is existing single antenna RRU structural representation.As shown in Figure 1, BBU connects one or more RRU, connects two RRU as example take a BBU in Fig. 1, is connected by optical fiber between BBU and RRU, correspondingly, includes the optical transceiver that is connected optical fiber in BBU and 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 as required amplifier, splitter etc.
Referring to Fig. 1, comprise at least in existing RRU: interface (IR) interface unit, processor unit and clock unit between analog radio frequency unit, digital intermediate frequency unit, RRU and BBU, above-mentioned each unit is arranged in same equipment.Wherein, IR represents the interface between RRU and 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, is connected 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 uplink receiving.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 to 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 DDC and etc. the Data buffer that cushions 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 completes the parsing of the IR agreement between RRU and BBU and base band data is processed, and communicates by serial parallel and serializer and optical transceiver and BBU.
At present in the single antenna RRU of TD-SCDMA system, single pass radiofrequency signal is only processed in each IR interface unit and Digital IF Processing unit, so transmission capacity is little, thereby at the customer service close quarters, needs to use a plurality of RRU just can complete 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 to export powerful downstream signal, the power that present RRU exports antenna to is 20W, adopts present RRU power consumption larger.Therefore, when using a plurality of RRU to cover at the customer service close quarters, more strengthen equipment power dissipation, increased simultaneously equipment cost.In a word, the transmission capacity of present single antenna RRU is little, and power loss is large.
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 for receiving the up analog radio-frequency signal from antenna, amplify, filtering, down-conversion, gain-adjusted, analog-to-digital conversion, simple protocol coding and parallel-serial 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 for receiving the 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 the descending digital baseband signal from BBU, carry out parallel-serial conversion, IR protocol processes, Digital Up Convert and simple protocol coding, obtain descending digital medium-frequency signal, and select a RF remote to send.
Described RF remote comprises:
The radio-frequency antenna filter be used for to receive the up analog radio-frequency signal from antenna, carries out sending circulator to after filtering, and, receive from the descending analog radio-frequency signal of circulator and send antenna to;
Circulator be used for 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 for receiving the up analog radio-frequency signal from circulator, sends up radio-frequency filter after amplifying to;
Up radio-frequency filter is used for receiving the up analog radio-frequency signal from the amplification of up LNA, carries out sending upstream mixer to after filtering;
Upstream mixer, be used for receiving the 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 for receiving the up analog intermediate frequency signal from upstream mixer, carries out sending up variable gain amplifier to after filtering;
Up variable gain amplifier is used for receiving the filtered up analog intermediate frequency signal from up intermediate-frequency filter, carries out sending to analog to digital converter ADC after gain-adjusted;
ADC is used for receiving 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 analog-to-digital conversion;
Digital to analog converter DAC is used for receiving 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 digital-to-analogue conversion;
Descending intermediate-frequency filter is used for receiving the descending analog if signal from DAC, carries out sending downstream mixer to after filtering;
Downstream mixer, be used for receiving the 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 for receiving the descending analog radio-frequency signal from downstream mixer, carries out sending to the downlink radio frequency filter after gain-adjusted;
The downlink radio frequency filter is used for receiving from the descending analog radio-frequency signal after the gain-adjusted of descending variable gain amplifier, carries out sending descending PA to after filtering;
Descending PA is used for receiving 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 for receiving the 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 sends DAC from the descending digital medium-frequency signal of parallel series and staticizer to after according to simple protocol, descending digital medium-frequency signal being resolved;
Parallel series and staticizer SERDES, be used for receiving the up digital intermediate frequency signal from the simple protocol processing module, carry out sending to the IR processing unit after parallel-serial conversion, 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 for the operation and maintenance O﹠amp of this RF remote of management; 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 is encoded, and, receive the downstream arrangements management information from parallel series and staticizer, send microprocessor to after resolving;
Described SERDES, be further used for receiving the up alarm management information from the simple protocol processing module, carry out sending to the IR processing unit after parallel-serial conversion, 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, select descending digital medium-frequency signal by DUC according to the control of processor from Data buffer, 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 Data buffer to after Digital Down Convert;
One or more DUC, each DUC receives the descending digital medium-frequency signal from Data buffer, carries out sending to after Digital Up Convert the simple protocol processing module of a correspondence;
A data Buffer Pool, be used for receiving the upstream digital intermediate-freuqncy signal after resolving from the simple protocol of all Digital Down Converter Module, the IR protocol process module corresponding to the upstream digital intermediate-freuqncy signal send to according to the selection of IR protocol process module, and, reception is from the descending digital medium-frequency signal of all IR protocol process module, and the selection according to the simple protocol processing module by DUC DUC corresponding to descending digital medium-frequency signal sends to;
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 Data buffer, carry out obtaining the upstream digital baseband signal after the IR protocol code, and send parallel series and the staticizer of a correspondence to, and, reception is carried out obtaining descending digital medium-frequency signal after the IR protocol analysis, and is sent Data buffer 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 staticizer receive the upstream digital baseband signal 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 sending to after parallel-serial conversion the IR protocol process module of a correspondence;
A processor is for the O﹠amp of this RRU of management; M information is also carried out hardware driving to this IR processing unit, control each IR protocol process module and select the upstream digital intermediate-freuqncy signal from Data buffer, and control each simple protocol processing module and select descending digital medium-frequency signal by DUC from Data buffer.
All further comprise in described each RF remote and 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 again, 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 again, produces the RF remote clock signal.
All further comprise in described each RF remote and 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, and described boundling cable comprises optical fiber, is used for RF remote and IR processing unit the transmission of data and control message;
All further comprise in described each RF remote and IR processing unit: optical transceiver is used for by optical fiber transmission or receive data and/or control message.
Up-downgoing signal transmission bit wide between described RF remote and 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 from the uplink time delay measurement message of RF remote, according to the propagation delay time of optical fiber in descending latency measurement message and uplink time delay measurement message measuring set bunch cable;
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.
Described boundling cable further comprises power line, is used for the IR processing unit and powers to RF remote; Described RF remote further comprises power module, is used for receiving the electric current from the IR processing unit, carries out transformation and/or rectification and processes rear power supply as RRU.
By above summary of the invention as seen, comprise a plurality of RF remotes and a shared IR processing unit at single antenna RRU, a plurality of RF remotes are integrated in a RRU, so increased the transmission capacity of RRU, the regional RRU of employing that only needs can complete covering in dense traffic, 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 present invention;
Fig. 3 is embodiment of the present invention RF remote 21 internal structure schematic diagrames;
Fig. 4 is embodiment of the present invention IR processing unit 22 internal structure schematic diagrames;
Fig. 5 is the data transmission format schematic diagram between embodiment of the present invention IR processing unit 22 and RF remote 21;
Fig. 6 is the latency measurement schematic diagram between embodiment of the present invention IR processing unit 22 and 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 comprised 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 is placed in 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, jointly form a RRU by above-mentioned two equipment.
Fig. 2 is the structural representation of the single antenna RRU of the embodiment of the present invention.As shown in Figure 2, the single antenna RRU of the embodiment of the present 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 amplifies, filtering, down-conversion, gain-adjusted, analog-to-digital conversion, simple protocol coding and parallel-serial conversion, obtains the upstream digital intermediate-freuqncy signal and sends to IR processing unit 22.And, receive the 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 the descending digital baseband signal that IR processing unit 22 receives from BBU carries out parallel-serial conversion, IR protocol processes, Digital Up Convert and simple protocol coding, obtains descending digital medium-frequency signal, and selects a RF remote 21 to send.
In the present embodiment, comprise that take single antenna RRU n RF remote 21 is as 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.This boundling cable comprises optical fiber, is used for the transmission of data and control command between RF remote 21 and IR processing unit 22.A kind of better execution mode 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 is connected with BBU by one or more optical fiber.
Referring to Fig. 2, each IR processing unit 22 is connected 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 by IR processing unit 22 optical fiber interface of a plurality of BBU, 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 access RRU, therefore can make different Mobile Communication Service business share same group of RRU equipment.
Fig. 3 is embodiment of the present invention RF remote 21 internal structure schematic diagrames.As shown in Figure 3, the RF remote 21 of the embodiment of the present 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 better execution mode is that the RF remote 21 of the embodiment of the present 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 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 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 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 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 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 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 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 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 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 sends DAC 2109 from the descending digital medium-frequency signal of SERDES 2117 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 the 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 mixes this information in the space of data according to simple protocol, 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 sending to IR processing unit 22 after parallel-serial conversion, and, receive the 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 carried out sending to IR processing unit 22 after parallel-serial conversion from the up alarm management information of simple protocol processing module 2116, 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 of the first recovered clock signals of de-twitter circuit module of the 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 again, produce the clock signal of high stability, as RF remote 21 clock signals, namely 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, be connected 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, by optical fiber transmission or receive data and/or control message.
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, RF remote 21 further comprises power module 2123, and the electric current that power module 2123 receives from IR processing unit 22 carries out transformation and/or rectification and processes rear power supply as RRU.
Fig. 4 is embodiment of the present invention IR processing unit 22 internal structure schematic diagrames.As shown in Figure 4, the IR processing unit 22 of the embodiment of the present 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 buffer 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, select descending digital medium-frequency signal according to the control of processor 2207 by DUC 2203 from Data buffer 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 management and the monitoring information to RF remote 21 of self processor 2207, carries out sending corresponding RF remote 21 to after 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 mixes this information in the space of data according to simple protocol, 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 buffer 2204 to after Digital Down Convert.
In one or more DUC 2203, the descending digital medium-frequency signal that each DUC 2203 receives from Data buffer 2204 carries out sending to after Digital Up Convert the 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 buffer 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 after the IR protocol analysis, and is sent Data buffer 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 present 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 complete the IR protocol processes.
In one or more SERDES 2206, each parallel series and staticizer receive the upstream digital baseband signal 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 sending to after parallel-serial conversion the IR protocol process module 2205 of a correspondence.In embodiments of the present invention, take 2 SERDES 2206 as example, in concrete the application, can also adjust the number of SERDES 2206, when RRU works, can carry out simultaneously the up-downgoing transfer of data by all SERDES2206, also can adopt a part of SERDES 2206 to carry out simultaneously the up-downgoing transfer of data, 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 select the upstream digital intermediate-freuqncy signal from Data buffer 2204, and control each simple protocol processing module 2201 and select descending digital medium-frequency signal by DUC2203 from Data buffer 2204.Further, management and monitoring information that processor 2207 generates RF remote 21, control dynamic-configuration and the local operation of the carrier wave of each RF remote 21 and safeguard and research and develop test, and controlling 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 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 again, produce the clock signal of high stability, as IR processing unit 22 clock signals, namely as the whole plate clock signal of IR processing unit 22, and be dispensed to each chips of IR processing unit 22 inside.PLL 2209 also can adopt FGPA to realize.
Further, each IR processing unit 22 also comprises: TDD timing recovery module 2210, be connected with IR protocol process module 2205, be used for producing according to the control information of main carrier the control signal of the TD time slot that satisfies third generation partner program (3GPP) requirement, recover TDD Um interface timeslot in IR processing unit 22.TDD timing recovery module 2210 also can adopt FGPA to realize.
Further, be connected by optical fiber due between RRU and BBU, therefore also comprise one or more external optical transceivers 2212 in 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 between RRU and BBU, transmitting data information and O﹠amp; 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, by the transmission of boundling cable or receive data and/or a control message that comprises optical fiber.
When communicating by optical fiber between RF remote 21 and 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 present invention IR processing unit 22 and RF remote 21.Referring to Fig. 5, a kind of better embodiment is, the total bit wide of up-downgoing signal transmission between RF remote 21 and 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 communicating by optical fiber boundling cable between RF remote 21 and IR processing unit 22, optical fiber boundling cable can cause propagation delay time, therefore need to measure the propagation delay time between RF remote 21 and IR processing unit 22.Fig. 6 is the latency measurement schematic diagram between embodiment of the present invention IR processing unit 22 and 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 delay measurement message at next ascending time slot to IR processing unit 22.IR processing unit 22 receives from the uplink time delay of RF remote 21 and measures message, according to the propagation delay time of optical fiber in descending latency measurement message and uplink time delay measurement message measuring set bunch cable.
By above embodiment as seen, comprise a plurality of RF remotes and a shared IR processing unit at single antenna RRU, 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 covering power and the covering efficient in dense traffic zone.And, due to a plurality of RF remotes as one independently equipment be positioned at antenna side, adopt integrated design with antenna, and the IR processing unit as another independently equipment be positioned at indoor, RF remote is connected with distant IR processing unit by the boundling cable, therefore shortened the feeder line that is connected between RRU and antenna, reduced the power loss that feeder line causes, thereby reduced power consumption and the volume of RRU equipment.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (9)
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 for receiving the up analog radio-frequency signal from antenna, amplify, filtering, down-conversion, gain-adjusted, analog-to-digital conversion, simple protocol coding and parallel-serial 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 for receiving the 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 the descending digital baseband signal from BBU, carry out parallel-serial conversion, IR protocol processes, Digital Up Convert and simple protocol coding, obtain descending digital medium-frequency signal, and select a RF remote to send;
There are a plurality of optical fiber interfaces that are connected with BBU in the IR processing unit, is connected with BBU by multifiber;
All further comprise in described each RF remote and 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 again, 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 again, produces the RF remote clock signal.
2. RRU according to claim 1, is characterized in that, described RF remote comprises:
The radio-frequency antenna filter be used for to receive the up analog radio-frequency signal from antenna, carries out sending circulator to after filtering, and, receive from the descending analog radio-frequency signal of circulator and send antenna to;
Circulator be used for 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 for receiving the up analog radio-frequency signal from circulator, sends up radio-frequency filter after amplifying to;
Up radio-frequency filter is used for receiving the up analog radio-frequency signal from the amplification of up LNA, carries out sending upstream mixer to after filtering;
Upstream mixer, be used for receiving the 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 for receiving the up analog intermediate frequency signal from upstream mixer, carries out sending up variable gain amplifier to after filtering;
Up variable gain amplifier is used for receiving the filtered up analog intermediate frequency signal from up intermediate-frequency filter, carries out sending to analog to digital converter ADC after gain-adjusted;
ADC is used for receiving 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 analog-to-digital conversion;
Digital to analog converter DAC is used for receiving 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 digital-to-analogue conversion;
Descending intermediate-frequency filter is used for receiving the descending analog if signal from DAC, carries out sending downstream mixer to after filtering;
Downstream mixer, be used for receiving the 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 for receiving the descending analog radio-frequency signal from downstream mixer, carries out sending to the downlink radio frequency filter after gain-adjusted;
The downlink radio frequency filter is used for receiving from the descending analog radio-frequency signal after the gain-adjusted of descending variable gain amplifier, carries out sending descending PA to after filtering;
Descending PA is used for receiving 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 for receiving the 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 sends DAC from the descending digital medium-frequency signal of parallel series and staticizer to after according to simple protocol, descending digital medium-frequency signal being resolved;
Parallel series and staticizer SERDES, be used for receiving the up digital intermediate frequency signal from the simple protocol processing module, carry out sending to the IR processing unit after parallel-serial conversion, 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 for the operation and maintenance O﹠amp of this RF remote of management; 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 is encoded, and, receive the downstream arrangements management information from parallel series and staticizer, send microprocessor to after resolving;
Described SERDES, be further used for receiving the up alarm management information from the simple protocol processing module, carry out sending to the IR processing unit after parallel-serial conversion, 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, select descending digital medium-frequency signal by DUC according to the control of processor from Data buffer, 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 Data buffer to after Digital Down Convert;
One or more DUC, each DUC receives the descending digital medium-frequency signal from Data buffer, carries out sending to after Digital Up Convert the simple protocol processing module of a correspondence;
A data Buffer Pool, be used for receiving the upstream digital intermediate-freuqncy signal after resolving from the simple protocol of all Digital Down Converter Module, the IR protocol process module corresponding to the upstream digital intermediate-freuqncy signal send to according to the selection of IR protocol process module, and, reception is from the descending digital medium-frequency signal of all IR protocol process module, and the selection according to the simple protocol processing module by DUC DUC corresponding to descending digital medium-frequency signal sends to;
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 Data buffer, carry out obtaining the upstream digital baseband signal after the IR protocol code, and send parallel series and the staticizer of a correspondence to, and, reception is carried out obtaining descending digital medium-frequency signal after the IR protocol analysis, and is sent Data buffer 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 staticizer receive the upstream digital baseband signal 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 sending to after parallel-serial conversion the IR protocol process module of a correspondence;
A processor is for the O﹠amp of this RRU of management; M information is also carried out hardware driving to this IR processing unit, control each IR protocol process module and select the upstream digital intermediate-freuqncy signal from Data buffer, and control each simple protocol processing module and select descending digital medium-frequency signal by DUC from Data buffer.
5. the described RRU of any one according to claim 1 to 4, is characterized in that, all further comprises in described each RF remote and IR processing unit:
TDD timing recovery module is used for recovering RF remote and IR processing unit TDD Um interface timeslot.
6. 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, and described boundling cable comprises optical fiber, is used for RF remote and IR processing unit the transmission of data and control message;
All further comprise in described each RF remote and IR processing unit: optical transceiver is used for by optical fiber transmission or receive data and/or control message.
7. RRU according to claim 6, is characterized in that,
Up-downgoing signal transmission bit wide between described RF remote and 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.
8. RRU according to claim 6, is characterized in that,
Described IR processing unit, be further used for sending descending latency measurement message to RF remote, and reception is from the uplink time delay measurement message of RF remote, according to the propagation delay time of optical fiber in descending latency measurement message and uplink time delay measurement message measuring set bunch cable;
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.
9. RRU according to claim 6, is characterized in that,
Described boundling cable further comprises power line, is used for the IR processing unit and powers to RF remote; Described RF remote further comprises power module, is used for receiving the electric current from the IR processing unit, carries out transformation and/or rectification and processes rear power supply as RRU.
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