CN101895344A - Method and system for combining passive optical network and mobile network - Google Patents

Abstract

The invention relates to a method and a system for combining a passive optical network and a mobile network. The method comprises the following steps that: 1, the base band of the mobile network is partially connected to an upper connector of an optical line terminal of the passive optical network; 2, an optical network unit of the passive optical network receives a downlink optical signal and converts the downlink optical signal into an electric signal for processing, and the processed electric signal is transmitted by an antenna of the optical network unit; and 3, the optical network unit receives an uplink signal from the antenna and processes the uplink signal, and the processed uplink signal is converted into the optical signal and then transmitted by the passive optical network to the base band part of the mobile network. The system of the invention has the advantages of saving network construction cost and lowering network cabling complexity.

Description

A method and system for integrating passive optical network and mobile network

technical field

The invention relates to the communication field, in particular to a system and method for integrating an ONU (Optical Network Unit) in a PON (Passive Optical Network) and a radio frequency part of a mobile network.

Background technique

With the reorganization of domestic operators, both China Telecom and China Unicom have become full-service operators, and the integration of fixed and mobile networks has become a major trend for current operators. Network integration is reflected in three levels, backbone network level, core network level and access network level. Among them, the integration of backbone network and core network is relatively simple, because on the backbone and core network, IP over WDM (wavelength division multiplexing) technical solutions have become a reality. However, at the access network level, there has been no substantial progress. At present, the integration of fixed network and mobile network is reflected in two aspects: one is in terms of indoor micro-coverage, the so-called fixed network and mobile network are realized through fixed network plus WiFi wireless local area network or fixed network plus Femtocell (femtocell base station). The integration of fixed access is used as the wireless coverage backhaul technology; the second is to use EPON/GPON (Ethernet Passive Optical Network/Gigabit Passive Optical Network) technology between the base station controller and the base station, and PON also takes into account the base station Access to major clients. There are two disadvantages in adopting the PON method. One is that the security requirements between the base station and the base station controller are very high, but the tree-type network structure of PON is difficult to meet its security requirements; the other is that it is limited by the site of the base station. resources, and its major customers have limited access.

The maturity of PON technology has promoted the rapid development of fixed broadband access technology. As shown in Figure 1 below, 16 or 32 An ONU (Optical Network Unit) can realize FTTH/FTTB (fiber to the home/fiber to the building) or FTTC (fiber to the curb) according to different scenarios, so as to realize different forms of broadband access. The interface adopts standard GE/FE interface, and the rate can reach 1.25G. The other end of the OLT is the same as BAS (Broadband Access Server, Broadband Access Server) and NGN (Next Generation Network, Next Generation Network).

The ONU close to the user side can provide voice and data or access to large customers at the same time. The scope of use of the ONU determines the difference in the implementation of FTTH/FTTB/FTTC by the PON. No matter whether the ONU is on the roadside or to the building, all of them need a separate power supply. .

The ONU structure in the PON network is shown in Figure 2. ONU is connected with ODN and terminal. The ONU includes an optical transceiver, a layer 2 data processing module and a voice and data processing module.

The function of the optical transceiver is to realize photoelectric conversion, which is to convert the received optical signal into an electrical signal and transfer it to the second-layer data processing module for processing; convert the electrical information processed by the second-layer data module into an optical signal and send it out.

The function of the layer 2 data processing module is to realize the function of layer 2 data exchange and divide VLAN. In the downlink direction, from the received data, according to the MAC address, it receives its own data packet; in the uplink direction, according to the service attribute level, the user The data is divided into VLANs and then transmitted to the optical transceiver.

The function of the voice and data processing module realizes the voice access of VOIP or TDM in the aspect of voice, and realizes the access processing of broadband data in the aspect of data processing.

As shown in Figure 3, the cellular base station and the optical fiber repeater are connected by optical fiber, and as shown in Figure 4, the BBU (baseband unit) and the RRU (radio remote unit) or the optical fiber repeater are connected by optical fiber. The optical fiber section has a transfer box, the backbone is between the transfer box and the cellular base station or BBU, and the wiring is between the transfer box and the optical fiber repeater or RRU.

Although the RRU and fiber optic repeater can be extended to tens of kilometers, in actual network deployment, considering that the RRU and fiber optic repeater generally provide centralized power supply through the equipment room, their usage distance is within 100 meters from the BBU. For scenarios longer than 100m, separate DC power supplies are required for the RRU and the fiber optic repeater. This solution undoubtedly increases investment.

The structure of RRU or optical fiber repeater is shown in Figure 5. RRU or optical fiber repeater includes optical transceiver, codec and baseband processor, up-converter, down-converter, duplexer and antenna.

The function of the optical transceiver is to realize photoelectric conversion, which is to convert the received optical signal into an electrical signal and transfer it to the decoding and baseband processor; convert the data processed by the decoding and baseband processor into an optical signal and send it out.

Codec and baseband processor: in the downlink direction, the received data is decoded, and the baseband signal is processed; in the uplink direction, the signal from the upconverter is encoded and baseband processed, and then transmitted to the optical transceiver.

Upconverter: Convert the frequency of the uplink radio frequency signal to the frequency of the baseband signal

Downconverter: convert the downlink baseband signal to RF frequency and pass it to the duplexer

Duplexer: accepts and forwards uplink and downlink signals

In the past, when PON solved fixed broadband access and distributed base station/optical fiber repeater to achieve indoor or special scene coverage, it did not consider the way of fixed network and mobile network integration, that is, it did not consider the sharing of transmission and access to the building end. The sharing of power sources results in waste of investment and passive operation.

Contents of the invention

In order to solve the above technical problems, a method and system for integrating fixed network and mobile network are provided, which can save network construction costs and reduce network wiring.

The invention discloses a method for integrating a passive optical network and a mobile network, including:

Step 1, the baseband part of the mobile network is connected to the uplink interface of the optical line terminal of the passive optical network;

Step 2, the optical network unit of the passive optical network receives the downlink optical signal, converts the downlink optical signal into an electrical signal, processes the electrical signal, and transmits the processed electrical signal from the antenna of the optical network unit ;

Step 3, the optical network unit receives the uplink signal from the antenna, processes the uplink signal, converts the processed uplink signal into an optical signal and sends it to the baseband part of the mobile network through the passive optical network.

The step 2 is further,

Step 21, the optical transceiver of the optical network unit receives the downlink optical signal, and converts the downlink optical signal into an electrical signal;

Step 22, the data processor of the optical network unit performs data link layer processing on the received data;

Step 23, the decoding of the optical network unit and the baseband processor perform baseband processing on the data;

Step 24: The up-conversion processor of the optical network unit converts the baseband processed signal to the transmission frequency band, performs power amplification after processing, and transmits it from the antenna through the duplexer.

The step 3 is further as follows,

Step 31, the antenna of the optical network unit receives the uplink signal, the down-conversion processor of the optical network unit receives the uplink signal through a duplexer, performs low-noise power amplification on the uplink signal, and amplifies the uplink signal Down-frequency to baseband after signal processing;

Step 32, the decoding of the optical network unit and the baseband processor perform baseband processing on the data;

Step 33, the data processor of the optical network unit performs data link layer processing on the baseband processed data;

Step 34, the optical transceiver of the optical network unit converts the processed uplink signal into an optical signal and sends it.

The step 22 is further as follows,

Step 41, the data processor of the optical network unit restores the data packet sent by the baseband part of the mobile network from the received information.

The step 33 is further as follows,

Step 51, the data processor of the ONU divides the data into VLANs.

One baseband part of the mobile network corresponds to two optical network units in the same area.

The two optical network units work at the same frequency to provide a basis for multiple input and multiple output.

The two optical network units use different frequency working modes to provide a basis for dual carrier.

The invention also discloses a system for integrating passive optical network and mobile network, the system includes: the baseband part of the mobile network and the passive optical network, the passive optical network includes an optical line terminal and an optical network unit,

The baseband part of the mobile network is connected to the uplink interface of the optical line terminal of the passive optical network;

The optical network unit has an antenna,

The optical network unit is used to receive a downlink optical signal, convert the downlink optical signal into an electrical signal, process the electrical signal, and transmit the processed electrical signal from the antenna of the optical network unit; receiving the uplink signal, processing the uplink signal, converting the processed uplink signal into an optical signal and sending it to the baseband part of the mobile network through the passive optical network.

The optical network unit further includes an optical transceiver, a data processor, a decoding and baseband processor, an up-conversion processor, and a duplexer;

The optical transceiver is configured to receive a downlink optical signal and convert the downlink optical signal into an electrical signal;

The data processor is configured to receive the electrical signal, perform data link layer processing on the data, and send the processed data signal to the decoding and baseband processor;

The decoding and baseband processor are used to perform baseband processing on data;

The up-conversion processor is used to convert the baseband processed signal to the transmission frequency band, perform power amplification after processing, and transmit it from the antenna through the duplexer.

The optical network unit further includes an optical transceiver, a data processor, a decoding and baseband processor, a down-conversion processor, and a duplexer;

The down-conversion processor is used to amplify the uplink signal received by the antenna through the duplexer with low noise power, and down-convert the uplink signal to baseband after processing;

The decoding and baseband processor are used to perform baseband processing on the data down-converted to the baseband;

The data processor is configured to perform data link layer processing on the baseband processed data;

The optical transceiver is used to convert the uplink signal processed by the data link layer into an optical signal and send it.

The data processor is further configured to restore the data packet sent by the baseband part of the mobile network from the received information.

The data processor is further used for performing VLAN division on data.

One baseband part of the mobile network corresponds to two optical network units in the same area.

The two optical network units work at the same frequency to provide a basis for multiple input and multiple output.

The two optical network units use different frequency working modes to provide a basis for dual carrier.

The beneficial effect of the present invention is to realize the effective integration of fixed broadband access and wireless coverage; avoid the double construction of ONU and RRU or optical fiber repeater, save equipment investment; avoid the failure of ONU and RRU or optical fiber repeater in series points, improving system reliability; reducing space requirements due to centralized installation of ONUs and RRUs or optical fiber repeaters; and reducing power consumption.

Description of drawings

Figure 1 is a prior art PON network structure diagram

Fig. 2 is the structural diagram of ONU in prior art PON network;

Fig. 3 is a schematic diagram of the way of adopting cellular base station and optical fiber repeater in the prior art;

Fig. 4 is a schematic diagram of the mode of using BBU plus RRU or optical fiber repeater in the prior art;

Fig. 5 is a structural diagram of an RRU or an optical fiber repeater;

Fig. 6 is a structural diagram of a specific embodiment of the system of the present invention;

Fig. 7 is a structural diagram of the ONU of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

A system for integrating passive optical network and mobile network includes: a baseband part of the mobile network and a passive optical network, the passive optical network including an optical line terminal and an optical network unit,

The baseband part of the mobile network is connected to the uplink interface of the optical line terminal of the passive optical network;

The optical network unit has an antenna,

The optical network unit is used to receive a downlink optical signal, convert the downlink optical signal into an electrical signal, process the electrical signal, and transmit the processed electrical signal from the antenna of the optical network unit; receiving the uplink signal, processing the uplink signal, converting the processed uplink signal into an optical signal and sending it to the baseband part of the mobile network through the passive optical network.

The structure of a specific embodiment of the system of the present invention is shown in FIG. 6 .

The system includes a baseband part 601 of a mobile network and a passive optical network, and the passive optical network includes an OLT602, an ODN603, and an ONU604 with a fusion function.

The baseband part 601 is connected to the uplink port of the OLT602. ODN603 divides the optical path into multiple paths, and ONU604 is connected to the branched optical path.

ONU604 has an antenna,

The ONU604 is used to receive a downlink optical signal, convert the downlink optical signal into an electrical signal, process the electrical signal, and transmit the processed electrical signal from the antenna; it is also used to receive an uplink signal from the antenna, and process the uplink signal, The processed uplink signal is converted into an optical signal and sent to the baseband part 601 through the passive optical network.

The uplink interface of OLT is also connected with NGN (Next Generation Network) and BAS (Broadband Access Server).

The ODN603 is also connected with the ONU shown in Figure 2 in the prior art to provide fixed network services.

The structure of ONU604 is shown in Figure 7.

The ONU 604 further includes an optical transceiver 701 , a data processor 702 , a decoding and baseband processor 703 , an up-conversion processor 704 , a down-conversion processor 705 , and a duplexer 706 .

The optical transceiver 701 is configured to receive a downlink optical signal and convert the downlink optical signal into an electrical signal.

The data processor 702 is configured to receive the electrical signal, perform data link layer processing on the data, and send the processed data signal to the decoding and baseband processor.

In the system of the present invention, when the OLT602 accesses the data of the baseband part 601, the processing of the two-layer transparent transmission is performed, and the data processor 702 needs to recover the original data of the baseband part 601 through two-layer processing, and then send it to the decoding and baseband processor 703 be processed in.

The decoding and baseband processor 703 is configured to perform baseband processing on data.

The up-conversion processor 704 is used to convert the frequency of the baseband processed signal to the transmission frequency band, perform power amplification after processing, and transmit it from the antenna through the duplexer 706 .

The down-conversion processor 705 is configured to amplify the uplink signal received by the antenna through the duplexer 706 with low noise power, process the uplink signal and down-convert the frequency to the baseband.

The decoding and baseband processor 703 is also configured to perform baseband processing on the data down-converted to the baseband.

The data processor 702 is also configured to perform data link layer processing on the baseband processed data.

The data processor 702 performs VLAN (Virtual Local Area Network) or corresponding data link layer services.

The optical transceiver 701 is also configured to convert the uplink signal processed by the data link layer into an optical signal and send it.

A baseband part 701 of a mobile network corresponds to two ONUs 604 in the same area.

The two ONU604 work at the same frequency to provide a basis for multiple input and multiple output; or the two ONU604 work at different frequencies to provide a basis for dual carrier.

The method of the present invention is as follows.

Step 100, the baseband part of the mobile network is connected to the uplink interface of the optical line terminal of the passive optical network.

Step 200, the optical network unit of the passive optical network receives the downlink optical signal, converts the downlink optical signal into an electrical signal, processes the electrical signal, and transmits the processed electrical signal from the antenna of the optical network unit.

Step 300, the optical network unit receives the uplink signal from the antenna, processes the uplink signal, converts the processed uplink signal into an optical signal and sends it to the baseband part of the mobile network through the passive optical network.

The step 200 is further as follows,

Step 210, the optical transceiver of the ONU receives the downlink optical signal, and converts the downlink optical signal into an electrical signal.

Step 220, the data processor of the optical network unit performs data link layer processing on the received data.

The data processor of the optical network unit restores the data packet sent by the baseband part of the mobile network from the received information.

Step 230, the decoding and baseband processor of the ONU performs baseband processing on the data.

Step 240, the up-conversion processor of the optical network unit converts the baseband processed signal to the transmission frequency band, performs power amplification after processing, and transmits it from the antenna through the duplexer.

The step 300 is further as follows,

Step 310, the antenna of the optical network unit receives the uplink signal, the down-conversion processor of the optical network unit receives the uplink signal through the duplexer, performs low-noise power amplification on the uplink signal, and reduces the uplink signal after processing the uplink signal. frequency to baseband.

Step 320, the decoding and baseband processor of the ONU performs baseband processing on the data.

In step 330, the data processor of the ONU performs data link layer processing on the baseband processed data.

The data processor of the ONU divides the data into VLANs.

Step 340, the optical transceiver of the optical network unit converts the processed uplink signal into an optical signal and sends it.

In the present invention, the baseband part of a mobile network corresponds to the two optical network units in the same area. The two optical network units work at the same frequency to provide a basis for multiple input and multiple output, or the two optical network units work at different frequencies to provide a basis for dual carrier.

Various modifications can be made to the above contents by those skilled in the art without departing from the spirit and scope of the present invention defined by the claims. Therefore, the scope of the present invention is not limited to the above description, but is determined by the scope of the claims.

Claims (16)

1. combining passive optical network and mobile network's method is characterized in that, comprising:

Step 1, described mobile network's baseband portion are connected in the last connecting port of the optical line terminal of described EPON;

Step 2, the optical network unit of described EPON receives downlink optical signal, and described downlink optical signal is converted to the signal of telecommunication, handles the described signal of telecommunication, with the antenna emission of the signal of telecommunication after handling from described optical network unit;

Step 3, described optical network unit receives upward signal from antenna, handles described upward signal, and the upward signal after handling is converted to light signal sends to described mobile network by EPON baseband portion.

2. combining passive optical network as claimed in claim 1 and mobile network's method is characterized in that, described step 2 further is,

Step 21, the optical transceiver of described optical network unit receives downlink optical signal, and described downlink optical signal is converted to the signal of telecommunication;

Step 22, the data processor of described optical network unit carries out data link layer deals to the data that receive;

Step 23, the decoding of described optical network unit and baseband processor are carried out Base-Band Processing to data;

Step 24, the upconversion process device of described optical network unit with Base-Band Processing after signal frequency conversion to transmit frequency band, carry out power amplification after handling, launch by antenna through duplexer.

3. combining passive optical network as claimed in claim 1 and mobile network's method is characterized in that, described step 3 further is,

Step 31, described optical network unit receive upward signal by antenna, the down-converted device of described optical network unit receives described upward signal through duplexer, and described upward signal is carried out the low noise power amplification, is downconverted to base band after described upward signal is handled;

Step 32, the decoding of described optical network unit and baseband processor are carried out Base-Band Processing to data;

Step 33, the data processor of the described optical network unit data after to Base-Band Processing are carried out data link layer deals;

Step 34, the optical transceiver of described optical network unit will be handled the back upward signal and be converted to light signal and transmission.

4. combining passive optical network as claimed in claim 2 and mobile network's method is characterized in that, described step 22 further is,

Step 41, the data processor of described optical network unit restore the packet of described mobile network's baseband portion transmission from reception information.

5. combining passive optical network as claimed in claim 3 and mobile network's method is characterized in that, described step 33 further is,

Step 51, the data processor of described optical network unit are carried out VLAN to data and are divided.

6. combining passive optical network as claimed in claim 1 and mobile network's method is characterized in that,

Two described optical network units of the corresponding the same area of a described mobile network's baseband portion.

7. combining passive optical network as claimed in claim 6 and mobile network's method is characterized in that,

Described two optical network units adopt with the frequency working method, think that carrying out multiple-input and multiple-output provides the basis.

8. combining passive optical network as claimed in claim 6 and mobile network's method is characterized in that,

Described two optical network units adopt different working methods frequently, think that carrying out two carrier waves provides the basis.

9. combining passive optical network and mobile network's system is characterized in that system comprises: mobile network's baseband portion and EPON, and described EPON comprises optical line terminal and optical network unit,

Described mobile network's baseband portion is connected in the last connecting port of the optical line terminal of described EPON;

Described optical network unit has antenna,

Described optical network unit is used to receive downlink optical signal, and described downlink optical signal is converted to the signal of telecommunication, handles the described signal of telecommunication, with the antenna emission of the signal of telecommunication after handling from described optical network unit; Also be used for receiving upward signal, handle described upward signal, the upward signal after handling is converted to light signal sends to described mobile network by EPON baseband portion from antenna.

10. combining passive optical network as claimed in claim 9 and mobile network's system is characterized in that, described optical network unit further comprises optical transceiver, data processor, decoding and baseband processor, upconversion process device, duplexer;

Described optical transceiver is used to receive downlink optical signal, and described downlink optical signal is converted to the signal of telecommunication;

Described data processor is used to receive the described signal of telecommunication, and data are carried out data link layer deals, and the data-signal after handling is sent to described decoding and baseband processor;

Described decoding and baseband processor are used for data are carried out Base-Band Processing;

Described upconversion process device is used for signal frequency conversion after the Base-Band Processing carrying out power amplification to transmit frequency band after handling, and is launched by described antenna through described duplexer.

11. combining passive optical network as claimed in claim 9 and mobile network's system is characterized in that, described optical network unit further comprises optical transceiver, data processor, decoding and baseband processor, down-converted device, duplexer;

Described down-converted device is used for carrying out the low noise power amplification with received the upward signal that receives through duplexer by antenna, is downconverted to base band after described upward signal is handled;

Described decoding and baseband processor are used for the data that are downconverted to base band are carried out Base-Band Processing;

Described data processor is used for the data after the Base-Band Processing are carried out data link layer deals;

Described optical transceiver is used for the upward signal after the data link layer deals being converted to light signal and sending.

12. combining passive optical network as claimed in claim 10 and mobile network's system is characterized in that, described data processor is further used for restoring the packet that described mobile network's baseband portion sends from reception information.

13. combining passive optical network as claimed in claim 11 and mobile network's system is characterized in that, described data processor is further used for that data are carried out VLAN and divides.

14. combining passive optical network as claimed in claim 9 and mobile network's system is characterized in that,

Two described optical network units of the corresponding the same area of a described mobile network's baseband portion.

15. combining passive optical network as claimed in claim 14 and mobile network's system is characterized in that,

Described two optical network units adopt with the frequency working method, think that carrying out multiple-input and multiple-output provides the basis.

16. combining passive optical network as claimed in claim 14 and mobile network's system is characterized in that,

Described two optical network units adopt different working methods frequently, think that carrying out two carrier waves provides the basis.

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