CN201947457U - Optical fiber distribution radio frequency remote system on basis of PON (Passive Optical Network) - Google Patents
Optical fiber distribution radio frequency remote system on basis of PON (Passive Optical Network) Download PDFInfo
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- CN201947457U CN201947457U CN2010205590750U CN201020559075U CN201947457U CN 201947457 U CN201947457 U CN 201947457U CN 2010205590750 U CN2010205590750 U CN 2010205590750U CN 201020559075 U CN201020559075 U CN 201020559075U CN 201947457 U CN201947457 U CN 201947457U
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Abstract
The utility model relates to the technical field of mobile communication and provides an optical fiber distribution radio frequency remote system on the basis of a PON (Passive Optical Network). The optical fiber distribution radio frequency remote system comprises a near end unit and a far end unit. The near end unit is connected with the far end unit through the PON in a TDMA (Time Division Multiple Address) mode. The near end unit comprises a synchronous clock and an interface module. The synchronous clock and the interface module are connected with an SNI (Sequence-Number Indicator) interface of an OLT (Optical Line Terminal). A clock synchronization method is consistent with an OLT synchronization method. The far end unit comprises a synchronous interface and a clock synchronization module. The clock synchronization module acquires a synchronizing signal from the synchronous interface. The synchronous interface acquires a lock synchronization source from an external GPS (Global Positioning System). In the utility model, the problem that the optical fiber distribution radio frequency remote system is matched with the PON in the aspects of the interface and clock synchronization is solved, and thus, the radio frequency remote system can transmit data in the existing TDMA-PON, so that wireless signal covering is realized and the establishment of a communication network can be rapidly completed.
Description
Technical field
The utility model relates to the mobile communication technology field, particularly a kind of optical fiber distributed type radio frequency stretch system.
Background technology
Along with Internet is the ICT (information and communication technology) fast development of representative and popularizes that the social informatization degree improves constantly.Various novel multimedia services, continue to bring out as VoIP, VOD and digital TV in high resolution etc., needed bandwidth is also in continuous increase, traditional broadband access can not be satisfied existing business development, simultaneously because the progress of ethernet technology, by its leading local area network (LAN) bandwidth also from 10M, 100M is to 1G even 10G, the place that needs most breakthrough at present just is to connect a section between network backbone and local area network (LAN) and the domestic consumer, Here it is " last kilometer " often said, and this is an individual bottleneck.Must break this bottleneck, just may welcome the new world of network world.This just looks like the highway system in a country, and high-grade broad highway has all been built up in main line and arterial highway, each department, but leads to the doorway or the narrow winding trail of family and businessman, and the efficient of this highway network can't be brought into play effectively.
In order to tackle the Access Network bottleneck problem of above-mentioned " last kilometer " mentioned, telecom operators have proposed the Access Network development tactics of " light advances copper and moves back ", promptly use PON (Passive Optical Network, passive optical-fiber network) to realize fiber-to-the-home front yard (FTTH) or Fiber-To-The-Building (FTTB).
In addition, just in carrying out like a raging fire, original GSM (Global System for Mobile Communications, global system for mobile communications) network is also in continuous optimization simultaneously in the 3G construction.And no matter be between the BBU and RRU of 3G, or between the near-end machine of GSM and the digital optical fiber direct station, they all connect with optical fiber.Though optical fiber transmission signal quality height lays that the optical fiber quantities is big, constructional difficulties, the cycle is long, cost is high, this is one of bottleneck of building of communication network.
Because what PON adopted is access network technology, radio frequency stretch system adopts station technology, and two kinds of technical field differences are not also used these two kinds of technical combinations at present together.
The utility model content
The purpose of this utility model is to overcome the problem of existing RRU and digital optical fiber direct station laying optical fiber and difficult wiring, merge station technology and access network technology, a kind of optical fiber distributed type radio frequency stretch system based on TDMA-PON is provided, be that operator does not need to lay separately optical fiber again, utilize existing P ON transmission base band data, realize that wireless signal covers.
The utility model is achieved through the following technical solutions above-mentioned purpose: a kind of optical fiber distributed type radio frequency stretch system based on PON, comprise near-end unit and far-end unit two large divisions, the near-end unit is connected with the PON of far-end unit by the TDMA mode, PON comprises OLT (Optical Line Terminal, optical line terminal) and ONU (Optical Network Unit, optical network unit); The near-end unit comprises synchronised clock and interface module, and the SNI of this module and OLT (Service Node Interface, SNI) connects, and obtains the clock synchronization source by the mode identical with OLT; Far-end unit comprises sync cap, clock synchronization module, and clock synchronization module obtains synchronizing signal from sync cap, and sync cap is obtained the clock synchronization source from external GPS.
By above technical scheme, the utility model does not need to lay again optical fiber when doing the access covering and the network optimization, by solve radio frequency stretch system on interface and clock synchronization with the matching problem of PON, make radio frequency stretch system can directly use existing optical transport platform PON transmission data, realize the wireless signal covering, can finish the construction of communication network very soon.This way has been saved valuable fiber resource, for networking and network optimization aspect bringing great convenience.
Description of drawings
Fig. 1 is the application example figure of radio frequency stretch system in PON;
Fig. 2 is the radio frequency stretch system near-end cellular construction schematic diagram based on PON;
Fig. 3 is radio frequency stretch system far-end unit form 1 structural representation based on PON;
Fig. 4 is radio frequency stretch system far-end unit form 2 structural representations based on PON.
Embodiment
PON mainly contains two kinds of access mode: TDMA (Time Division Multiple Access, time division multiple access) and WDM (Wavelength Division Multiplexing, wavelength division multiplexing).That is that all right technically is ripe based on the PON of WDM mode, also uses on a large scale, and operator's PON overwhelming majority of disposing all is based on the PON of TDMA mode at present.Recent years, the PON network development was rapid, and the PON network system has all been adopted in a lot of places, and supporting fiber plant also puts in place step by step.Meanwhile, everybody is being between the BBU and RRU between the radio frequency stretch system also, or lay fiber problem between near-end machine and the digital optical fiber direct station and perplex, the utility model has utilized the PON network of existing TDMA mode, the PON of this TDMA mode is applied on the radio frequency stretch system, by solving on interface and clock synchronization the matching problem with PON, make radio frequency stretch system not need to lay again optical fiber, use existing optical transport platform PON, can transmit base band data preferably, realize that wireless signal covers.
As shown in Figure 1, the disclosed a kind of optical fiber distributed type radio frequency stretch system based on PON of the utility model comprises near-end unit and far-end unit (general designation of RRU and digital optical fiber direct station), and the near-end unit is connected with the PON of far-end unit by the TDMA mode; PON comprises OLT and ONU.
Wherein, the near-end unit comprises synchronised clock and interface module, and this synchronised clock is connected with the SNI interface of OLT with interface module, and near-end unit clock synchronizing method is consistent with the method for synchronous of OLT; Far-end unit comprises sync cap, clock synchronization module, and clock synchronization module obtains synchronizing signal from sync cap, and sync cap is obtained the clock synchronization source from external GPS.
Far-end unit of the present utility model in addition can comprise the far-end unit of integrated ONU and/or not have two kinds of situations of far-end unit of ONU.The far-end unit of integrated ONU can not be subject to UNI (User Network Interface, User Network Interface), and the far-end unit of no ONU is connected with the UNI of ONU by GE (Gigabit Ethernet, gigabit Ethernet) interface.In the far-end unit of no ONU, the clock synchronization source can also obtain from outside ONU except from external GPS obtains.
Down direction in transfer of data, the near-end unit inserts the SNI interface, make the near-end unit to carry out exchanges data with OLT, OLT converges the near-end data, issue each ONU or far-end unit with broadcast mode then, here as a specific embodiment, only will information transmitted be divided into three the tunnel, be numbered 1 respectively, 2,3, and the transmission of data flow is carried out according to the order that is numbered 132131, wherein, be numbered 1 the predetermined user USER that sends in the former PON network of packets of information, be numbered 2 the predetermined far-end unit that sends to no ONU of packets of information, be numbered 3 the predetermined far-end unit that sends to built-in ONU of packets of information.As shown in Figure 1, when data flow arrives the far-end unit of ONU or built-in ONU, owing between ONU and far-end, inserted uni interface or directly built-in ONU, do not worry the unmatched problem of interface, therefore data flow can be transmitted between the two smoothly, the far-end unit of each ONU or built-in ONU only extracts the packets of information of issuing it, and abandons the packets of information of issuing other ONU or far-end unit.The up direction of transfer of data, adopt the TDMA technology, each far-end unit all distributes a transmission time slot, as be respectively 1,2,3 or the like, all time slots keep synchronously, and leave the gap to each other, mutual collision can not take place when converging to common fiber in the packet that guarantees different ONU and far-end unit.In the uplink and downlink process, such as how to judge which packets of information be issue it oneself, how to accomplish the synchronous etc. of time slot, these all are the customary means in the former PON network, do not do here and give unnecessary details.
The utility model is based on the optical fiber distributed type radio frequency stretch system of TDMA-PON, has realistic meaning in application, and need not increase the PON device and change existing P ON network, more has superiority on the cost.
As shown in Figure 2, the near-end unit can also comprise except synchronised clock and interface module: duplexer, descending frequency-variable module, up frequency-variable module, digital module.Uplink and downlink frequency-variable module and digital module and synchronised clock and interface module are made the digital frequency conversion integrated board, and this integrated board is connected by radio frequency cable with duplexer.
The down link direction, base station signal is sent to the near-end unit by coupler, again by after frequency conversion, AD (Analog/Digital, mould/number) conversion, signal processing, the data encryption base band data being delivered to the SNI interface of OLT.Uplink direction is from the SNI interface reception far-end base band data of OLT, by delivering to the base station after data decryption, signal processing, DA (Digital/Analog, D/A) conversion, the frequency conversion.
OLT equipment in near-end unit and the PON network is placed on same place, synchronised clock in the near-end unit and interface module not only provide the SNI interface with the OLT matched, a plurality of clock interfaces have also been reserved, can support BITS clock, E1 phy clock, gps clock and synchronous Ethernet clock simultaneously, each clock can automatically switch in inside as the reference source.
Far-end unit has two kinds of forms as the terminal of PON network, and two kinds of forms all comprise sync cap, clock synchronization module.A kind of is the far-end unit of integrated ONU, can also comprise: optical module interface, ONU functional module, digital module, up frequency-variable module, descending frequency-variable module, up LNA (Low Noise Amplifier, low noise amplifier) module, descending LNA module, cavity body filter, as shown in Figure 3.Optical module interface, sync cap, clock synchronization module, ONU functional module, digital module and uplink and downlink frequency-variable module are made the digital RF integrated board, this digital RF integrated board is connected by radio frequency cable with uplink and downlink LNA module, and uplink and downlink LNA module is connected by radio frequency cable with cavity body filter.
The far-end unit of integrated ONU has all functions of ONU in the former PON network, the action principle of this far-end unit is: the down link direction, the broadcast data that the ONU functional module sends by optical module selective reception OLT, range finding and power control command that response OLT sends, and do the corresponding clock adjustment, simultaneously, reserve a GPS sync cap, clock synchronization module can obtain synchronizing signal from sync cap.The ONU functional module is delivered to digital module to the base band data of separating the frame processing and is done corresponding data decryption, signal processing, through exporting to antenna opening behind DA conversion, frequency conversion, amplification, the filtration module.Uplink direction, behind the filtering of aerial signal process, LNA, the frequency-variable module, deliver to digital module and carry out AD conversion, signal processing, data encryption, in the ONU module, signal data is carried out buffer memory then, and in the send window that OLT distributes, send to up direction.
The far-end unit of integrated ONU can adopt circuit to visit true technology (CESoP) and extract clock synchronization, can also obtain the clock synchronization source by external GPS.In addition, the data that the far-end unit of integrated ONU extracts on the circuit also form a kind of algorithm, and this algorithm also can be used for obtaining the clock synchronization source.
Also have a kind of far-end unit form, ONU is external, is called the far-end unit of no ONU again.Can also comprise GE interface, PHY (Physical Layer, physical layer), digital module, up frequency-variable module, descending frequency-variable module, up LNA module, descending LNA module, cavity body filter, as shown in Figure 4.GE interface, sync cap, PHY, clock synchronization module, digital module and uplink and downlink frequency-variable module are made the digital RF integrated board, this digital RF integrated board is connected by radio frequency cable with uplink and downlink LNA module, and uplink and downlink LNA module is connected by radio frequency cable with cavity body filter.
The action principle of the far-end unit of this no ONU is: the down link direction, PHY obtains data by the GE interface from outside ONU, clock synchronization module obtains synchronizing signal by sync cap from ONU or GPS, PHY delivers to digital module to data and does corresponding data decryption, signal processing, through exporting to antenna opening behind DA conversion, frequency conversion, amplification, the filtration module.Uplink direction, aerial signal be through after the filtering, LNA, frequency-variable module, delivers to digital module and carry out AD conversion and signal processing, data encryption, then data is dealt into PHY, and PHY issues outside ONU to the uplink baseband data by the GE interface again.
The far-end unit of no ONU is connected with the uni interface of outside ONU by gigabit ethernet interface, and clock sync signal can obtain from outside ONU or GPS, and the far-end unit of no ONU can receive the 1pps+TOD signal of outside ONU or GPS.
In addition, in the far-end unit of two kinds of forms, can also comprise a MAC (Media Access Control, medium access control) interface, this MAC interface is used to transmit the base band data between ONU functional module (PHY) and the digital module.Promptly in the down link direction, receive the base band data in the ONU functional module (PHY) after, be forwarded to digital module by the MAC interface; Uplink direction behind the base band data in the reception digital module, is forwarded to it in ONU functional module (PHY) by the MAC interface.
In order to prevent that transmitting data is stolen in PON, in the near-end unit that the utility model provides and the digital module of far-end unit, all comprised the encryption and decryption functional module, can encrypt or decryption processing the data that digital module receives.
When the utility model is applied in radio frequency stretch system at the PON with the TDMA mode, except solving the coupling on interface and clock synchronization, also solved the problem of time delay and bandwidth.Digital module in near-end unit and far-end unit has the function of integrated decoding, by built-in algorithm, can solve the problem of time delay and bandwidth preferably.
The utility model is applicable to all communication standards, comprising: GSM, TD-SCDMA, CDMA2000, WCDMA, WIMAX, LTE etc.
The utility model has following advantage and effect with respect to prior art: do not need to lay again optical fiber when doing the access covering and the network optimization, use existing optical transport platform PON, the realization wireless signal covers, and can finish the construction of communication network very soon.In addition, because the ONU equipment among the PON of TDMA mode can be integrated in the integrated board of RRU/ repeater, so do not worry the unmatched problem of uni interface, clock synchronization also can directly inside realize.And, can consider to have ensured the quality of the clock sync signal that obtains with multiple synchronised clock access way because reserved sync cap.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (10)
1. the optical fiber distributed type radio frequency stretch system based on PON comprises near-end unit and far-end unit, it is characterized in that: described near-end unit is connected with the PON of described far-end unit by the TDMA mode;
Described PON comprises optical line terminal OLT and optical network unit ONU; Described near-end unit comprises synchronised clock and interface module, and described synchronised clock is connected with the SNI SNI of described optical line terminal OLT with interface module, and the method for described near-end unit clock synchronization is consistent with the method for synchronous of optical line terminal OLT; Described far-end unit comprises sync cap, clock synchronization module, and described clock synchronization module obtains synchronizing signal from described sync cap, and described sync cap is obtained the clock synchronization source from external GPS.
2. a kind of optical fiber distributed type radio frequency stretch system based on PON according to claim 1 is characterized in that, described far-end unit comprises the far-end unit of integrated optical networking unit ONU and/or the far-end unit of non-fiber network element ONU; The far-end unit of described non-fiber network element ONU is connected with the User Network Interface UNI of external fiber network element ONU by gigabit Ethernet GE interface, and described sync cap is also obtained the clock synchronization source from described external fiber network element ONU.
3. a kind of optical fiber distributed type radio frequency stretch system based on PON according to claim 1 is characterized in that described synchronised clock and interface module comprise a plurality of clock interfaces, supports the switching in multiple clock source.
4. a kind of optical fiber distributed type radio frequency stretch system based on PON according to claim 3 is characterized in that described near-end unit also comprises: duplexer, descending frequency-variable module, up frequency-variable module, digital module; Described uplink and downlink frequency-variable module and digital module and described synchronised clock and interface module are made the digital frequency conversion integrated board, and this digital frequency conversion integrated board is connected by radio frequency cable with described duplexer.
5. a kind of optical fiber distributed type radio frequency stretch system according to claim 2 based on PON, it is characterized in that the far-end unit of described integrated optical networking unit ONU also comprises: optical module interface, ONU functional module, digital module, up frequency-variable module, descending frequency-variable module, up LNA module, descending LNA module, cavity body filter; Described optical module interface, ONU functional module, digital module and uplink and downlink frequency-variable module and described sync cap, clock synchronization module are made the digital RF integrated board, this digital RF integrated board is connected by described radio frequency cable with described uplink and downlink LNA module, and described uplink and downlink LNA module is connected by described radio frequency cable with described cavity body filter.
6. a kind of optical fiber distributed type radio frequency stretch system according to claim 2 based on PON, it is characterized in that the far-end unit of described non-fiber network element ONU also comprises: GE interface, PHY, digital module, up frequency-variable module, descending frequency-variable module, up LNA module, descending LNA module, cavity body filter; Described GE interface, PHY, digital module and uplink and downlink frequency-variable module and described sync cap, clock synchronization module are made the digital RF integrated board, this digital RF integrated board is connected by radio frequency cable with described uplink and downlink LNA module, and uplink and downlink LNA module is connected by radio frequency cable with described cavity body filter.
7. a kind of optical fiber distributed type radio frequency stretch system according to claim 5 based on PON, it is characterized in that: also comprise the MAC interface in the far-end unit of described integrated optical networking unit ONU, described ONU functional module is connected with digital module by described MAC interface; Base band data is delivered to digital module by described ONU functional module from the MAC interface, or delivers to the ONU functional module by described digital module from the MAC interface.
8. a kind of optical fiber distributed type radio frequency stretch system according to claim 6 based on PON, it is characterized in that: also comprise the MAC interface in the far-end unit of described non-fiber network element ONU, described PHY is connected with digital module by described MAC interface, base band data is sent to digital module by described PHY from the MAC interface, or is sent to PHY by described digital module from the MAC interface.
9. according to described any the optical fiber distributed type radio frequency stretch system based on PON of claim 1 to 8, it is characterized in that: the communication standard of described radio frequency stretch system comprises: GSM, TD-SCDMA, CDMA2000, WCDMA, WIMAX, LTE.
10. according to described any the optical fiber distributed type radio frequency stretch system of claim 1 to 8 based on PON, it is characterized in that: all include the encryption and decryption functional module in the digital module of described near-end unit and far-end unit, be used for the data that described digital module receives are encrypted or decryption processing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205590750U CN201947457U (en) | 2010-10-12 | 2010-10-12 | Optical fiber distribution radio frequency remote system on basis of PON (Passive Optical Network) |
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| CN2010205590750U CN201947457U (en) | 2010-10-12 | 2010-10-12 | Optical fiber distribution radio frequency remote system on basis of PON (Passive Optical Network) |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102769494A (en) * | 2012-07-02 | 2012-11-07 | 华为技术有限公司 | Methods for transmitting and receiving data and devices for transmitting and receiving |
| CN103023571A (en) * | 2012-12-05 | 2013-04-03 | 冀北电力有限公司信通分公司 | Light wireless networking communication system and light wireless networking communication method suitable for electricity consumption information gathering |
| CN103326783A (en) * | 2012-03-23 | 2013-09-25 | 华为技术有限公司 | Signal transmission method, relevant equipment and signal transmission system |
| CN103546215A (en) * | 2013-11-04 | 2014-01-29 | 中邮科通信技术股份有限公司 | LTE transmission and coverage system for achieving FTTH based on digital technology |
| WO2018049987A1 (en) * | 2016-09-15 | 2018-03-22 | Huawei Technologies Co., Ltd. | Unified mobile and tdm-pon uplink mac scheduling for mobile front-haul |
| WO2019051869A1 (en) * | 2017-09-15 | 2019-03-21 | Huawei Technologies Co., Ltd. | Efficient cpri transmission |
| CN112073927A (en) * | 2020-08-11 | 2020-12-11 | 北京华电天仁电力控制技术有限公司 | Ecological network system based on eLTE and GPON |
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2010
- 2010-10-12 CN CN2010205590750U patent/CN201947457U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103326783A (en) * | 2012-03-23 | 2013-09-25 | 华为技术有限公司 | Signal transmission method, relevant equipment and signal transmission system |
| CN103326783B (en) * | 2012-03-23 | 2016-08-17 | 华为技术有限公司 | A kind of method for transmitting signals and relevant device and signal transmission system |
| CN102769494A (en) * | 2012-07-02 | 2012-11-07 | 华为技术有限公司 | Methods for transmitting and receiving data and devices for transmitting and receiving |
| CN103023571A (en) * | 2012-12-05 | 2013-04-03 | 冀北电力有限公司信通分公司 | Light wireless networking communication system and light wireless networking communication method suitable for electricity consumption information gathering |
| CN103546215A (en) * | 2013-11-04 | 2014-01-29 | 中邮科通信技术股份有限公司 | LTE transmission and coverage system for achieving FTTH based on digital technology |
| CN103546215B (en) * | 2013-11-04 | 2017-01-11 | 中邮科通信技术股份有限公司 | LTE transmission and coverage system for achieving FTTH based on digital technology |
| WO2018049987A1 (en) * | 2016-09-15 | 2018-03-22 | Huawei Technologies Co., Ltd. | Unified mobile and tdm-pon uplink mac scheduling for mobile front-haul |
| US10355801B2 (en) | 2016-09-15 | 2019-07-16 | Futurewei Technologies, Inc. | Unified mobile and TDM-PON uplink MAC scheduling for mobile front-haul |
| WO2019051869A1 (en) * | 2017-09-15 | 2019-03-21 | Huawei Technologies Co., Ltd. | Efficient cpri transmission |
| CN112073927A (en) * | 2020-08-11 | 2020-12-11 | 北京华电天仁电力控制技术有限公司 | Ecological network system based on eLTE and GPON |
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