JP6899856B2 - Wireless communication system and wireless radio frequency device - Google Patents

Description

The present invention relates to the field of communication technology, and specifically to wireless communication systems and wireless radio frequency devices.

Many wireless networks use a distributed base station architecture, where a remote radio unit (RRU) is connected to a baseband control unit (BBU) by optical fiber, and one BBU is multiple. Can support RRU. Cascade connection of multiple RRUs is a common network construction method in scenarios where multiple RRUs need to be connected to the same BBU at the same station.

Hereinafter, the data transmission mode of the wireless communication system 900 in which one BBU supports two cascade RRUs is used as an example of description. In the downlink direction, as shown in Figure 5, the BBU90 receives the downlink data transmitted by the gateway, processes the downlink data, and an optical transceiver through the Common Public Radio Interface (CPRI). (Optical transceiver) Although the processed downlink data is transmitted to 93, the optical transceiver is also called an optical module. The optical transceiver 93 converts the processed downlink data into a first downlink optical carrier signal and transmits the first downlink optical carrier signal through the optical fiber to the optical transceiver 94 corresponding to the RRU 91; the optical transceiver 94 is the first. Converts the downlink optical carrier signal to the first downlink electrical signal and sends the first downlink electrical signal to the RRU91; the RRU91 selectively receives part of the primary downlink electrical signal and the rest of the signal. Transmit to the optical transceiver 95; the optical transceiver 95 converts the remaining signal into a second downlink optical carrier signal and transmits the second downlink optical carrier signal through the optical fiber to the optical transceiver 96; the optical transceiver 96 is the second. The downlink optical carrier signal is converted into a second downlink electric signal, and the second downlink electric signal is transmitted to the RRU92. In this way, the downlink data received from the gateway can be transmitted to the mobile terminal using RRU91 and RRU92.

In the uplink direction, the RRU91 and RRU92 individually receive the uplink data transmitted by the mobile terminal and process the uplink data to obtain the uplink electrical signal. The RRU92 transmits the acquired first uplink electrical signal to the optical transceiver 96 corresponding to the RRU92; the optical transceiver 96 converts the first uplink electrical signal into the first uplink optical carrier signal and first through the optical fiber. The uplink optical carrier signal is transmitted to the optical transceiver 95 corresponding to RRU91; the optical transceiver 95 converts the first uplink optical carrier signal into a second uplink electrical signal and transmits the second uplink electrical signal to RRU91. The RRU91 integrates the second uplink electrical signal with the uplink electrical signal acquired by the RRU91 to acquire the third uplink electrical signal, and transfers the third uplink electrical signal to the optical transceiver 94 connected to the RRU91. Transmit; the optical transceiver 94 converts the third uplink electrical signal into a second uplink optical carrier signal, and the BBU90 processes the second uplink optical carrier signal to process the processed second uplink optical carrier signal as a gateway. The second uplink optical carrier signal is transmitted to the BBU90 through the optical fiber so that it may be transmitted to.
It turns out that the RRU91 needs to transfer the data sent and received to and from the RRU92, and that the RRU92 will stop working if the RRU91 fails.

JP-A-2010-245987 Japanese Unexamined Patent Publication No. 11-340953 International Publication No. 2014/061552

Therefore, the existing network structure of distributed base stations has the following disadvantages: When one of the cascade RRUs (now referred to as the RRU) fails, the next RRU does not work, which results in system reliability. Decreases.

In view of this, embodiments of the present invention provide radio communication systems and radio radio frequency devices, which are the following RRUs when one of a plurality of cascaded RRUs fails in an existing distributed base station architecture. Solves the technical problem of system unreliability caused by the inability to operate.

The first aspect provides a radio radio frequency device, wherein the radio radio frequency device includes: M remote radio units, M optical transceivers, and at least one optical splitter, where M is 2 or more. It is an integer; M optical transceivers are individually connected to M remote radio units, and M optical transceivers have different operating frequencies; M optical transceivers have at least one optical splitter. Are connected to the same optical fiber by.

In the first possible embodiment of the first aspect, the optical splitter is a 1: N optical splitter, where N is an integer greater than or equal to 2 and less than or equal to M.

Referring to the first possible embodiment of the first aspect, in the second possible embodiment of the first aspect, the optical splitter is a 1: 2 optical splitter and the number of optical splitters is M-1. is there.

Referring to the second possible embodiment of the first aspect, in the third possible embodiment of the first aspect, when M is greater than 2, M-1 optical splitters are made by a single core optical fiber. Connected to each other.

With reference to either the first aspect or the first to third possible embodiments of the first aspect, in the fourth possible embodiment of the first aspect, the optical fiber is a single core optical fiber. ..

With reference to either the first aspect or the first to fourth possible implementations of the first aspect, in the fifth possible implementation of the first aspect, the first optical transceiver and the second optical transceiver The operating wavelength of each optical transceiver in the above includes a reception wavelength and a transmission wavelength.

A second aspect of the specification provides a wireless communication system, which includes: a baseband processing unit, an optical multiplexer, M first optical transceivers, and a wireless radio frequency device. M primary optical transceivers are provided between the baseband control unit and the optical multiplexer, the operating wavelengths of the M primary optical transceivers are different from each other, M is an integer greater than or equal to 2; radio radio frequency. The device includes: M remote radio units, M second optical transceivers, and at least one optical splitter, with M second optical transceivers connected to M remote radio units. Individually corresponding to M first optical transceivers, the operating wavelength of the first optical transceiver matches the operating wavelength of the second optical transceiver corresponding to the first optical transceiver; M second optical transceivers It is connected to the same optical fiber by at least one optical splitter, and the optical fiber is connected to the optical multiplexer and at least one optical splitter.

In the first possible embodiment of the second aspect, the optical splitter is a 1: N optical splitter, where N is an integer greater than or equal to 2 and less than or equal to M.

With reference to the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the optical splitter is a 1: 2 optical splitter and the number of optical splitters is M-1. is there.

With reference to the second possible embodiment of the second aspect, in the third possible embodiment of the second aspect, when M is greater than 2, the M-1 optical splitter is by a single core optical fiber. Connected to each other.

With reference to the first, second, or third possible implementation of the second aspect or second aspect, in the fourth possible implementation of the second aspect, the optical fiber is a single core optical fiber. is there.

With reference to the first to fourth possible implementations of the second aspect or the second aspect, in the fifth possible implementation of the second aspect, each optical of the first optical transceiver and the second optical transceiver The operating wavelength of the transceiver includes the reception wavelength and the transmission wavelength.

With reference to the fifth possible embodiment of the second aspect, in the sixth possible embodiment of the second aspect, the operating wavelength of the first optical transceiver corresponds to the first optical transceiver of the second optical transceiver. Matching the operating wavelength means: In the first optical transceiver and the second optical transceiver corresponding to the first optical transceiver, the transmission wavelength of the first optical transceiver is the same as the reception wavelength of the second optical transceiver, and the first It includes that the reception wavelength of the one optical transceiver is the same as the transmission wavelength of the second optical transceiver.

In the radio communication system of the present specification, different RRU optical signals are transmitted by using different wavelengths (including RRU to BBU transmission and BBU to RRU transmission), and therefore cascade RRU optical transceivers are different. Operates at wavelength. In addition, additional optical splitters are provided, all of these cascade RRU optical transceivers are connected to an optical splitter, which connects them to the same fiber optic. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to all RRU optical transceivers using optical splitters, and each optical transceiver corresponds to its own operating wavelength. Receiving only the signals that do; therefore, each RRU can receive its own signal accurately, and when one RRU fails, the operation of the other RRUs is unaffected, which greatly improves system reliability. It solves the technical problem of system unreliability caused by the inability of all of the following RRUs when a remote radio unit of multiple cascaded remote radio units fails in an existing distributed base station architecture.

In addition, after the above solution has been used, each RRU receives its own signal without the need to transfer the signal of another RRU, thereby reducing the bandwidth requirements of the CPRI interface. It reduces costs and does not impose any restrictions on the number of levels of cascade RRUs. In addition, each RRU no longer needs to be provided with two CPRI interfaces, which further reduces costs. In addition, the reduced demand on the bandwidth of the CPRI interface further reduces the demand on the speed of the optical transceiver, which further reduces the cost.

In order to more clearly explain the embodiment of the present invention or the technical solution in the prior art, the accompanying drawings required to explain the embodiment are briefly introduced below. Obviously, the accompanying drawings described below only show some embodiments of the present invention.

It is a schematic structure diagram of the wireless communication system by one Embodiment of this invention. It is a schematic structure diagram of the wireless communication system by another embodiment of this invention. It is a schematic structure diagram of the wireless communication system by still another embodiment of this invention. It is a schematic structure diagram of the wireless communication system by still another embodiment of this invention. It is a schematic structure diagram of the wireless communication system in the prior art.

Currently, in a distributed base station architecture, cascading multiple RRUs is a common network construction method; however, due to this network construction method, the current RRU sends data to be transferred to the next RRU, and is currently When an RRU fails, all of the following RRUs will not work, resulting in poor system reliability.

Based on a thorough examination of this issue herein, optical signals of different RRUs are transmitted by using different wavelengths (including transmissions from RRU to BBU and transmissions from BBU to RRU) and therefore cascades. RRU optical transceivers operate at different wavelengths. In addition, additional optical splitters are provided, all of which are connected to the optical splitter in these cascade RRUs, and are connected to the same fiber optic by the optical splitter. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to all RRU optical transceivers using optical splitters, and each optical transceiver corresponds to its own operating wavelength. Receiving only the signals that do; therefore, each RRU can receive its own signal accurately, and when one RRU fails, the operation of the other RRUs is unaffected, which greatly improves system reliability. ..

In addition, in the prior art, all RRU data must pass through the CPRI interface of the first RRU, and therefore there is a relatively high demand for the bandwidth of the CPRI interface, which increases costs; If the bandwidth of the CPRI interface is limited, the number of levels of cascade RRU is limited. In addition, the increased bandwidth of the CPRI interface also increases the demand for the speed of the optical transceiver, which further increases the cost.

However, after the above solution has been used, each RRU receives its own signal without the need to transfer the signal of another RRU, thereby reducing the bandwidth requirement of the CPRI interface. It reduces costs and does not impose any restrictions on the number of levels of Cascade RRU. In addition, each RRU no longer needs to be provided with two CPRI interfaces, which further reduces costs. In addition, the reduced demand on the bandwidth of the CPRI interface further reduces the demand on the speed of the optical transceiver, which further reduces the cost.

The technical solutions herein not only solve the problem of low reliability in the prior art, but also significantly reduce costs and do not impose any restrictions on the number of levels of cascade RRU.

In order for those skilled in the art to better understand the solutions of the present invention, the technical solutions of the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present invention. .. Obviously, the embodiments described are only some, but not all, of the embodiments of the present invention.

Embodiment 1
FIG. 1 is a schematic structural diagram of a wireless communication system 100 according to an embodiment of the present invention. As shown in FIG. 1, the radio communication system 100 includes: a baseband processing unit 10, an optical multiplexer 20, optical transceivers 31 and 32, and a radio radio frequency device 500, wherein the radio radio frequency device 500 includes. Includes remote radio units 41 and 42, optical transceivers 51 and 52, and optical splitter 60.

The baseband processing unit 10 is abbreviated as BBU, but its full name is Baseband Control Unit, and it is also called a baseband control unit. The BBU10 may include a transmission subsystem, a baseband subsystem, a control subsystem, and a power supply module. The transmission subsystem is configured to perform the function of sending and receiving data, including the interface between the BBU and the core network / controller, and the interface between the BBU and the high frequency module, and the BBU and the high frequency module. the interface between the common public radio interface (common public radio interface, CPRI) or other may be OBSAI (Open Base Station Architecture Initiative) interface. In this method, the BBU 10 includes two interfaces, i.e. the number of interfaces is the same as the number of remote radio units 40. The power supply module is configured to provide the power needed for the BBU10.

The baseband subsystem is mainly configured to perform baseband processing functions for uplink and downlink data, and mainly includes an uplink processing module and a downlink processing module. The uplink processing module is configured to demote and decode uplink baseband data from the transmission subsystem and to transmit the demodulated and decoded data through the transmission subsystem; downlink The processing module is configured to modulate and encode downlink baseband data from the transmission subsystem and to transmit the modulated and encoded data through the transmission subsystem.

The control subsystem is configured to manage the entire wireless communication system 100, and the control subsystem may have, for example, one or more of the following functions: device management, configuration management, alarm management, Operation and maintenance functions such as software management and debug and inspection management; signal processing functions such as logical resource management; requirements such as GPS clock phase fixing, frequency division execution, phase fixing and phase adjustment, and clock provision. The clock module function of the entire base station that meets the requirements.

The remote radio unit is abbreviated as RRU, but its full name is Radio Remote Unit. The RRU is sent to the antenna feeder to send a downlink baseband signal received from the BBU10, undergo frequency conversion, filtering, high frequency filtering, passed through a linear power amplifier, or on an uplink signal received from a mobile terminal. It is configured to perform filtering, further high frequency small signal amplification and filtering, downward conversion, analog-to-digital conversion, digital intermediate frequency processing, and the like. Each RRU is communicatively connected to the BBU10 using a single interface.

The optical multiplexer 20 is abbreviated as MUX, but its full name is optical multiplexer. The optical multiplexer 20 is a device that combines and separates several optical carrier signals having different wavelengths, and transmits several optical carrier signals having different wavelengths on one optical fiber or a plurality of them for transmission. In order to transmit a plurality of optical carrier signals through the optical fiber of the above, individual optical carrier signals may be incorporated in the plurality of optical carrier signals. The optical multiplexer 20 generally includes a plurality of input interfaces and one output interface. In this embodiment, the optical multiplexer 20 includes two input interfaces and one output interface, both of which are single-core bidirectional interfaces. In another embodiment, the interface may be a dual-core bidirectional interface.

Optical transceivers, whose full English name is optical transceiver, are also referred to as optical modules and are configured to perform photoelectric conversion, the photoelectric conversion referred to herein includes conversion of an optical signal to an electrical signal. However, it also includes the conversion of electrical signals to optical signals. Optical transceivers 31 and 32 are provided between the BBU 10 and the optical multiplexer 20, the optical transceiver 31 is connected to one input interface of one optical multiplexer 20 and one CPRI interface of the BBU 10, and the optical transceiver 32 is optical. It is connected to the other input interface of the multiplexer 20 and the other CPRI interface of the BBU 10. Optical transceivers 51 and 52 are connected to RRU 41 and 42, respectively, i.e. optical transceiver 51 is connected to RRU 41 and optical transceiver 52 is connected to RRU 42.

An optical transceiver generally includes an optoelectronic device, a functional circuit, an optical interface, and the like, and the optoelectronic device includes a light emitting unit and a light receiving unit. The light emitting part is realized as follows: A semiconductor laser diode device to emit a modulated optical signal having a corresponding speed after an electric signal having a specific bit rate is input and processed by an internal driver chip. An automatic light output level control circuit is provided in the optical electronic device so that the (LD) or light emitting diode (LED) is driven and the output level of the output light signal is kept constant here. The light receiving part is realized as follows: After an optical signal having a specific bit rate is input to the module, the optical signal is converted into an electric signal by a photodetector diode; the head amplifier amplifies the electric signal, Outputs an electrical signal with the corresponding bit rate. In short, the function of the optical transceiver is photoelectric conversion.

Each optical transceiver connected to the BBU10 corresponds to one RRU, and each RRU is provided with one optical transceiver corresponding to the RRU. The operating wavelengths of optical transceivers corresponding to the same RRU match each other, and the operating wavelengths of optical transceivers corresponding to different RRUs are different.For example, the operating wavelengths of optical transceivers 31 and 51 corresponding to RRU41 match each other, and RRU42 The operating wavelengths of the corresponding optical transceivers 32 and 52 also match each other, but the operating wavelengths of the optical transceivers 31 and 32 are different, and the operating wavelengths of the optical transceivers 51 and 52 are also different, thereby corresponding to the optical transceivers for each RRU. Guarantees that it will only receive signals that correspond to its operating wavelength. Matching the operating wavelengths referred to herein means that the transmission wavelength of one optical transceiver is the same as the reception wavelength of another optical transceiver, and another optical transceiver is transmitted by the optical transceiver. It is possible to receive optical signals. For example, the transmission wavelength of the optical transceiver 31 is equal to the reception wavelength of the optical transceiver 51; the reception wavelength of the optical transceiver 31 is equal to the transmission wavelength of the optical transceiver 51. The transmission wavelength of the optical transceiver 32 is equal to the reception wavelength of the optical transceiver 52; the reception wavelength of the optical transceiver 32 is equal to the transmission wavelength of the optical transceiver 52.

In addition, the above optical transceiver may be a dual-core bidirectional optical transceiver or a single-core bidirectional optical transceiver. When an optical transceiver is a dual-core bidirectional optical transceiver, each optical transceiver has one operating wavelength, which is used not only for transmission but also for reception; the optical transceiver is single-core bidirectional optical. When being a transceiver, each optical transceiver has two operating wavelengths, including a transmission wavelength and a reception wavelength. In this method, as an example, an optical transceiver is a single-core bidirectional optical transceiver, i.e., because transmission and reception are combined to perform on one optical fiber to transmit and receive optical signals. Different wavelengths are used for.

For example, the transmission wavelength of the optical transceiver 31 is λ1, the reception wavelength of the optical transceiver 31 is λ2, and λ2 is different from λ1. The transmission wavelength of the optical transceiver 32 is λ3, the reception wavelength of the optical transceiver 32 is λ4, and λ4 is different from λ3. Further, the transmission wavelength λ1 of the optical transceiver 31 is different from the transmission wavelength λ3 of the optical transceiver 32, the reception wavelength λ2 of the optical transceiver 31 is different from the reception wavelength λ4 of the optical transceiver 32, and the optical signal transmitted by a different optical transceiver is It is designed to guarantee that it can be received by different RRUs. In addition, since the above optical transceiver is a single-core bidirectional optical transceiver, the transmission wavelength λ1 and reception wavelength λ2 of the optical transceiver 31 are different, and the transmission wavelength λ3 and reception wavelength λ4 of the optical transceiver 32 are different; therefore, λ1, λ2, λ3, and λ4 are different from each other.

The optical transceiver 51 and the optical transceiver 31 are used in pairs, and the optical transceiver 52 and the optical transceiver 32 are used in pairs; therefore, when the transmission wavelength of the optical transceiver 31 is λ1, the reception of the optical transceiver 31 The wavelength is λ2, the reception wavelength of the optical transceiver 51 is λ1, the transmission wavelength of the optical transceiver 51 is λ2; when the transmission wavelength of the optical transceiver 32 is λ3, the reception wavelength of the optical transceiver 32 is λ4. , The reception wavelength of the optical transceiver 52 is λ3, and the transmission wavelength of the optical transceiver 52 is λ4, where λ1, λ2, λ3, and λ4 are different from each other.

The optical transceivers 51 and 52 are connected by an optical splitter 60 to an optical fiber 70 connected to the optical splitter 20. Specifically, the optical transceivers 51 and 52 may be connected to the optical splitter 60 using an optical fiber such as a single core bidirectional optical fiber. The optical multiplexer 20 may also be connected to the optical splitter 60 using an optical fiber such as a single core bidirectional optical fiber. The use of single-core bidirectional fiber optics reduces costs compared to the use of dual-core bidirectional fiber optics.

The optical splitter 60, also referred to as an optical branching device, is one of the key passive elements on a fiber optic link and is configured to perform coupling, branching, and distribution of optical signals. The number of input and output interfaces of the optical splitter 60 may be selected as desired. As shown in FIG. 1, in this embodiment, the number of RRUs is 2, the number of optical splitters 60 is 1, and the number of optical splitters 20 is 1. In this case, the optical splitter 60 is 1: 1. It is a two-optical splitter. Alternatively, when multiple RRUs are connected in cascade, as shown in FIG. 3 or 4, this means that each RRU is connected to the optical splitter 60 by one optical transceiver, which means that the optical splitter The 60 is also a 1: 2 optical splitter. The 1: 2 optical splitter has a small volume and can be placed directly into the maintenance cavity of the RRU, reducing the cost of implementation.

In this method, the number of RRUs is 2, the number of interfaces on the BBU10 is also 2, the number of optical transceivers connected to the BBU10 is also 2, and one light between the RRU and the optical splitter. A transceiver is provided. In a particular embodiment, the BBU 10 and the optical multiplexer 20 may be located in the equipment room and the RRUs 41 and 42 may be located away from the outdoor station using fiber optics. The optical transceiver 31 is mounted on interface 11 of BBU10, corresponding to RRU41, and the optical transceiver 32 is mounted on interface 12 of BBU10, corresponding to RRU42. The optical transceiver 51 is mounted on the RRU 41 and the optical transceiver 52 is mounted on the RRU 42. The optical splitter 60 may be provided independently or in the maintenance cavity of the RRU 41.

In the downlink direction, the BBU10 modulates and encodes the downlink baseband data and transmits the modulated and encoded downlink data through interfaces 11 and 12 to the optical transceivers 31 and 32; the optical transceivers 31 and 32 The received downlink data is converted into an optical carrier signal having a different wavelength and the optical carrier signal is transmitted to the optical multiplexer 20; the optical multiplexer 20 transmits the optical carrier signal to the optical splitter 60 through an optical fiber. , Incorporate optical carrier signals from optical transceivers 31 and 32 on one optical fiber. The optical transceivers 51 and 52 connected to the optical splitter 60 selectively receive data corresponding to the wavelength according to the wavelength. The reception wavelength of the optical transceiver 51 is equal to the transmission wavelength of the optical transceiver 31, and the optical transceiver 51 can only receive the data transmitted by the optical transceiver 31 to the optical multiplexer 20; the reception wavelength of the optical transceiver 52 is the optical transceiver. Equal to the transmission wavelength of 32, the optical transceiver 52 can only receive the data transmitted by the optical transceiver 32 to the optical multiplexer 20. After converting the received signal to a downlink electrical signal, the two optical transceivers 51 and 52 transmit the downlink electrical signal to RRU 41 and 42, respectively; RRU 41 and 42 receive a high frequency filtering of the received signal to provide a linear power amplifier. After passing, the received signal is transmitted to the antenna feeder by transmission filtering.

In the uplink direction, the RRUs 41 and 42 are filtered, low noise amplifiers, further high frequency small signal amplification and filtering, downward conversion, analog-digital on the uplink signal received from the mobile terminal to generate the uplink electrical signal. Performing conversion, digital intermediate frequency processing, etc., the uplink electrical signal is transmitted to the optical transceivers 51 and 52, respectively; the optical transceivers 51 and 52 convert the received uplink electrical signal into an uplink optical carrier signal. The optical transceivers 51 and 52 have different transmission wavelengths, where the transmission wavelength of the optical transceiver 51 is equal to the reception wavelength of the optical transceiver 31, and the data transmitted by the optical transceiver 51 can only be received by the optical transceiver 31. The transmission wavelength of the optical transceiver 52 is equal to the reception wavelength of the optical transceiver 32, and the data transmitted by the optical transceiver 52 can be received only by the optical transceiver 32. The optical splitter 60 couples the two received links of the uplink optical carrier signal onto the same downlink optical fiber and sends the signal to the optical multiplexer 20; the optical multiplexer 20 separates the received optical carrier signal. Separately transmit the separated optical carrier signals to the optical transceivers 31 and 32; the optical transceivers 31 and 32 convert the received optical carrier signals into uplink data signals and transfer the uplink data signals to the corresponding interface of the BBU10. Transmit; BBU10 democratizes and decodes the received uplink data signal and transmits the demodulated and decoded uplink data signal to the gateway.

When RRU41 fails, the signal of RRU42 is transmitted directly to the optical splitter 60 and can be transmitted to BBU10 using the optical splitter 60, and the signal of BBU10 is also transmitted to RRU42 using the optical splitter 60. It can be seen that this guarantees that the RRU42 can operate normally.

In the above wireless communication system 100, an optical splitter 60 is provided between two RRUs, that is, a first RRU 41 and a second RRU 42, and even when the first RRU 41 fails, the signal of the second RRU 42 is an optical splitter. It can be transmitted directly to the 60 and can be transmitted to the BBU10 using the optical splitter 60; the signal of the BBU10 can also be transmitted to the second RRU42 using the optical splitter 60, which allows the RRU42. Is guaranteed to work properly, but this is a system unreliable technology caused by the inability of all of the following RRUs to operate when multiple cascaded RRU remote radio units fail in an existing distributed base architecture. Solve the problem.

In addition, all links use different wavelengths for communication and are completely independent of each other, which is also optical because the communication bandwidth overlaps when multiple RRUs are cascaded. It also solves the technical problem of increasing transceiver speeds and limiting the number of cascaded RRUs on the same link.

Embodiment 2
Based on the same inventive idea, this specification further provides the wireless communication system 200. As shown in FIG. 2, the radio communication system 200 differs from the radio communication system 100 in the following points: the number of optical transceivers and the number of RRUs are different, and the optical splitters are different.

In this method, the number of RRU40s is M, so M optical transceivers 50 are individually connected to M RRU40s and M optical transceivers 30 are M between BBU10 and M RRU40s. It is provided on individual interfaces. The optical splitter 60 may be a 1: N optical splitter, where M is an integer greater than or equal to 3 and N is an integer greater than or equal to 2. The M RRU40s are individually connected to the optical splitter 60 by the M optical transceivers 50.

In this method, N is equal to M, the optical splitter 60 is a 1: M optical splitter, has M + 1 interfaces, where the number of optical splitters is 1. In this case, all RRU40s are connected to the optical splitter 60.

In another embodiment, N is different from M, for example, when N is equal to 2, the optical splitter 60 is a 1: 2 optical splitter and has three interfaces, where the number of optical splitters is It is M-1. One interface of the first optical splitter is connected to the optical splitter 20 by an optical fiber so that it receives multiple links of the optical signal obtained by the optical splitter 20 by coupling, and the other two interfaces are the first. Separately connected to the RRU40 and the second optical splitter; one interface of the i-th optical splitter is connected to the (i-1) th optical splitter and the other two interfaces are the i-th RRU and (i + 1). ) Individually connected to the th-th optical splitter, where 2 ≤ i ≤ M-2; the last optical splitter, i.e. one interface of the (M-1) th optical splitter, is (M-2). It is connected to the third optical splitter and the other two interfaces are individually connected to the (M-1) th RRU and the Mth RRU.

The operating principle of the wireless communication system 200 described above is the same as that of the wireless communication system 100, and the details are not described again in this specification. When any RRU of M RRU40 fails, the signal of the other RRU is transmitted directly to the optical splitter 60 and can be transmitted to the BBU10 using the optical splitter 60, as well as the signal of the BBU10. It can also be transmitted to another RRU40 using the optical splitter 60, which ensures that the other RRU40s can operate normally, which means that the RRUs of the multiple cascaded RRUs are already distributed. It solves the technical problem of system unreliability caused by the inability of all of the following RRUs to operate in the event of a failure in the base architecture.

In addition, in addition, all links use different wavelengths for communication and are completely independent of each other, which also causes overlapping communication bandwidths when multiple RRUs are cascaded. It also solves the technical problem of increasing the speed of optical transceivers and limiting the number of cascaded RRUs on the same link.

Embodiment 3
Based on the same inventive idea, this specification further provides the wireless communication system 300. As shown in FIG. 3, FIG. 3 is a schematic structural diagram of the wireless communication system 300 according to another embodiment of the present invention. The wireless communication system 300 differs from the wireless communication system 100 in FIG. 1 in the following points: the number of optical splitters 60 is 2, the number of RRU40s is 3, and therefore the number of interfaces of BBU10 is also 3. , The number of optical transceivers 30 connected to the BBU10 is 3, and the number of optical transceivers 50 connected to the RRU40 is also 3.

The number of optical splitters 60 is one less than the number of RRU40s, that is, there are two optical splitters 60, which are optical transceivers 61 and 62. The optical splitter 61 is connected to the optical splitter 20 and the optical splitter 62, the RRU 41 is connected to the optical splitter 61 by the optical transceiver 51, the RRU 42 is connected to the optical splitter 62 by the optical transceiver 52, and the RRU 43 is connected to the optical splitter 62 by the optical transceiver 53. It is connected to the.

In a particular embodiment, the BBU 10 and the optical multiplexer 20 may be located in the equipment room and the three RRU40s may be located away from the outdoor station using fiber optics. The optical transceiver 31 is mounted on interface 11 of BBU10, corresponding to RRU41; the optical transceiver 32 is mounted on interface 12 of BBU10, corresponding to the second RRU42; the optical transceiver 33 is mounted on BBU10, of BBU10. It is implemented on interface 13 corresponding to the third RRU43. The optical transceiver 51 is mounted on RRU41, the optical transceiver 52 is mounted on RRU42, and the optical transceiver 53 is mounted on RRU43. The optical splitter 61 is located in the maintenance cavity of the remote radio unit 41 and the optical splitter 62 is located in the maintenance cavity of the RRU 42.

In the downlink direction, the BBU10 modulates and encodes the downlink baseband data and transmits the modulated and encoded downlink data to the optical transceivers 31, 32, and 33 through interfaces 11, 12, and 13. The optical transceivers 31, 32, and 33 convert the received downlink data into optical carrier signals with different wavelengths and transmit the optical carrier signal to the optical multiplexer 20; the optical multiplexer 20 receives the received optical carrier. The signal is integrated on one optical fiber and the optical carrier signal is transmitted to the three optical transceivers 50 through the optical splitter 60; the three optical transceivers 50 selectively receive the data corresponding to the wavelength according to the wavelength. The reception wavelength of the optical transceiver 51 is equal to the transmission wavelength of the optical transceiver 31, and the optical transceiver 51 can only receive the data transmitted by the optical transceiver 31; the reception wavelength of the optical transceiver 52 is the transmission wavelength of the optical transceiver 32. The optical transceiver 52 can only receive the data transmitted by the optical transceiver 32; the reception wavelength of the optical transceiver 53 is equal to the transmission wavelength of the optical transceiver 33, and the optical transceiver 53 is transmitted by the optical transceiver 33. Only data can be received. After converting the received signal to a downlink electrical signal, the three optical transceivers 50 transmit the downlink electrical signal to the three RRU40s, which are after the signal has undergone high frequency filtering and passed through a linear power amplifier. The received signal is transmitted to the antenna feeder by transmission filtering.

In the uplink direction, the three RRU40s are filtered, low noise amplifier, further high frequency small signal amplification and filtering, downward conversion, analog-digital on the uplink signal received from the mobile terminal to generate the uplink electrical signal. Performs conversion, digital intermediate frequency processing, etc., and transmits the uplink electrical signal to the three optical transceivers 50; the three optical transceivers 50 convert the received uplink electrical signal into an uplink optical carrier signal. The three optical transceivers 50 have different transmission wavelengths, where the transmission wavelength of the optical transceiver 51 is equal to the reception wavelength of the optical transceiver 31, and the data transmitted by the optical transceiver 51 can only be received by the optical transceiver 31. It is possible; the transmission wavelength of the optical transceiver 52 is equal to the reception wavelength of the optical transceiver 32, and the data transmitted by the optical transceiver 52 can only be received by the optical transceiver 32; the transmission wavelength of the optical transceiver 53 is Equal to the reception wavelength of the optical transceiver 33, the data transmitted by the optical transceiver 53 can only be received by the optical transceiver 33. Optical splitters 61 and 62 combine three links of the uplink optical carrier signal on the same downlink optical fiber and transmit the signal to the optical multiplexer 20; the optical multiplexer 20 separates the received optical carrier signal. Separately transmit the separated optical carrier signals to optical transceivers 31, 32, and 33; after separating the received optical carrier signals into uplink optical carrier signals, the optical transceivers 31, 32, and 33 are up. The link data signal is transmitted to the corresponding three interfaces 11, 12, and 13 of the BBU10; the BBU10 demolishes and decodes the received uplink data signal and delivers the demodulated and decoded uplink data signal. Transmit to the gateway.

It can be seen that in the above embodiments, different wavelengths are used to transmit different RRU optical signals, and thus cascade RRU optical transceivers operate at different wavelengths. Further optical splitters are provided, all of these Cascade RRU optical transceivers are connected to an optical splitter and connected to the same fiber optic 70 by an optical splitter. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to all RRU optical transceivers using optical splitters, and each optical transceiver corresponds to its own operating wavelength. Receiving only the signals that do; therefore, each RRU can receive its own signal accurately, and when one RRU fails, the operation of the other RRUs is unaffected. For example, if RRU41 fails, the signals of RRU42 and 43 can be transmitted directly to BBU10 using the optical splitter 61, and the signal of BBU10 is also transmitted to RRU42 and RRU43 using the optical splitter 61. It is possible, which ensures that RRU42 and 43 can operate normally. If both RRU41 and RRU42 fail, RRU43 can use optical splitters 62 and 61 to transmit signals to BBU10, and BBU10 signals can also be transmitted to RRU43 using optical splitters 61 and 62. It is possible, and this solves the technical problem of system unreliability caused by the inability of all of the following RRUs to operate when one of the multiple cascaded RRUs fails in an existing distributed base architecture.

In addition, in addition, all links use different wavelengths for communication and are completely independent of each other, which also causes overlapping communication bandwidths when multiple RRUs are cascaded. It also solves the technical problem of increasing the speed of optical transceivers and limiting the number of cascaded RRUs on the same link.

Embodiment 4
Based on the same inventive idea, this specification further provides the wireless communication system 400. As shown in FIG. 4, FIG. 4 is a schematic structural diagram of the wireless communication system 400 according to still another embodiment of the present invention. The radio communication system 400 differs from the radio communication system 100 of FIG. 2 in the following points: the number of RRU 40s, the number of optical splitters 60, and the number of optical transceivers 50 are different. In this method, the number of RRU40s is M, where M is greater than 3; therefore, M optical transceivers 50 are individually connected to M RRU40s and M optical transceivers 30 are BBU10 and M. It is provided on M interfaces with RRU40s. The optical splitter 60 is a 1: 2 optical splitter, and the number of optical splitters 60 is M-1, where the M-1 optical splitters 60 are cascaded using a single core optical fiber 70.

One interface of the first optical splitter 60 is connected to the optical splitter 20 by an optical fiber 70 so that it receives multiple links of the optical signal obtained by the optical splitter 20 by coupling, and the other two interfaces are 1 Separately connected to the second RRU40 and the second optical splitter 60; one interface of the i-th optical splitter 60 is connected to the (i-1) th optical splitter 60 and the other two interfaces are i-th. RRU and (i + 1) th optical splitter 60 are individually connected, where 2 ≤ i ≤ M-2; the last optical splitter 60, i.e. 1 of the (M-1) th optical splitter 60. One interface is connected to the (M-2) th optical splitter 60, and the other two interfaces are individually connected to the (M-1 ) th RRU40 and Mth RRU40.

In a particular embodiment, the BBU 10 and the optical multiplexer 20 may be located in the equipment room and the M RRU40s may be located away from the outdoor station using fiber optics. The first optical transceiver 30 is mounted on interface 1, which corresponds to the first RRU40 of BBU10; the jth optical transceiver 30 is mounted on interface j, which corresponds to the jth RRU40 of BBU10. Here, 1 <j <M; the Mth optical transceiver 30 is mounted on the interface M, which corresponds to the Mth RRU40 of the BBU10. The first optical transceiver 50 is mounted on the first RRU40, the jth optical transceiver is mounted on the jth RRU40, where 1 <j <M, and the Mth optical transceiver 50 is the Mth. Implemented on RRU40. In addition, the first optical splitter 60 may be located in the maintenance cavity of the first RRU40, and the i-th optical splitter 60 may be located in the maintenance cavity of the i-th RRU40, where 2 ≤ i ≤ M-2, and the (M-1) th optical splitter 60 may be placed in the maintenance cavity of the (M-1) th RRU40. However, this embodiment is not limited to this, and the optical splitter 60 may be arranged independently or in another way.

In the downlink direction, the BBU10 modulates and encodes the downlink baseband data and transmits the modulated and encoded downlink data to the M optical transceivers 30; the M optical transceivers 30 receive the downlinks. The data is converted into optical carrier signals with different wavelengths and the optical carrier signal is transmitted to the optical multiplexer 20; the optical multiplexer 20 incorporates the received optical carrier signal on one optical fiber and optical transfer through the optical splitter 60. The signal is transmitted to the M optical transceivers 50; the M optical transceivers 50 selectively receive the data transmitted to the M optical transceivers according to the wavelength. After converting the received signal individually into a downlink electrical signal, M optical transceivers 50 transmit the downlink electrical signal to M RRU40s; M RRU40s receive linear power with the received signal undergoing high frequency filtering. After passing through the amplifier, the received signal is individually transmitted to the antenna feeder by transmission filtering.

In the uplink direction, M RRU40s are filtered, low noise amplifier, further high frequency small signal amplification and filtering, downward conversion, analog-on the uplink signal received from the mobile terminal to generate the uplink electrical signal. Performs digital conversion, digital intermediate frequency processing, etc., and transmits the uplink electrical signal correspondingly to the M optical transceivers 50; the M optical transceiver 50 transmits the received uplink electrical signal to the uplink optical carrier signal. Is converted to, and the uplink optical carrier signal is transmitted to the optical splitter 60.

The M optical transceivers 50 have different transmission wavelengths. Each optical transceiver 50 has one optical transceiver 30 that matches the optical transceiver 50, that is, the transmission wavelength of each optical transceiver 50 is equal to the reception wavelength of one optical transceiver 30, and the data transmitted by the optical transceiver 50 is It can only be received by the optical transceiver. The optical splitter 60 couples M links of the uplink optical carrier signal onto the same downlink optical fiber and sends the signal to the optical multiplexer 20; the optical multiplexer 20 separates the received optical carrier signal and The separated optical carrier signals are individually transmitted to the M optical transceivers 30; the M optical transceivers 30 convert the received optical carrier signals into uplink data signals and transmit the uplink data signals to the BBU10; The BBU10 democratizes and decodes the received uplink data signal and transmits the demodulated and decoded uplink data signal to the gateway.

It can be seen that in the above embodiments, different wavelengths are used to transmit different RRU optical signals, and thus cascade RRU optical transceivers operate at different wavelengths. Further optical splitters are provided, and all of these cascade RRU optical transceivers are connected to the optical splitter and are connected to the same fiber optic by the optical splitter. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to all RRU optical transceivers using optical splitters, and each optical transceiver corresponds to its own operating wavelength. Receiving only the signals that do; therefore, each RRU can receive its own signal accurately, and when one RRU fails, the operation of the other RRUs is unaffected. For example, if the first RRU fails, the signal of another RRU can be transmitted directly to BBU10 using the optical splitter 60, and the signal of BBU10 is also transmitted to another RRU using the optical splitter 60. This ensures that another RRU can operate normally, but this means that if one of the multiple cascaded RRUs fails in an existing distributed base architecture, all of the following RRUs will It solves the technical problem of system unreliability caused by inoperability.

In addition, in addition, all links use different wavelengths for communication and are completely independent of each other, which also causes overlapping communication bandwidths when multiple RRUs are cascaded. It also solves the technical problem of increasing the speed of optical transceivers and limiting the number of cascaded RRUs on the same link.

Embodiment 5
Based on the same inventive idea, this specification further provides a radio radio frequency device, but the radio radio frequency device is:
M RRUs, where M is an integer greater than or equal to 2, M RRUs,
M optical transceivers, which are individually connected to M RRUs, and the operating wavelengths of the M optical transceivers are different from each other.
At least one optical splitter, at least one optical splitter connecting M optical transceivers to the same optical fiber, that is, M optical transceivers connected to the same optical fiber by at least one optical splitter. , With at least one optical splitter,
including.

Preferably, the optical splitter is a 1: N optical splitter, where N is an integer greater than or equal to 2 and less than or equal to M.

Preferably, the optical splitter is a 1: 2 optical splitter and the number of optical splitters is M-1.

Preferably, when M is greater than 2, the M-1 optical splitters are connected to each other by a single core optical fiber.

Preferably, the optical fiber is a single core optical fiber.

Preferably, the operating wavelength of each optical transceiver of the first optical transceiver and the second optical transceiver includes a reception wavelength and a transmission wavelength.

In embodiments, different RRU optical signals are transmitted by using different wavelengths (including RRU-to-BBU and BBU-to-RRU transmissions), so the cascade RRU optical transceivers operate at different wavelengths. I understand. In addition, additional optical splitters are provided, all of which are connected to the optical splitter in these cascade RRUs, and are connected to the same fiber optic by the optical splitter. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to all RRU optical transceivers using optical splitters, and each optical transceiver corresponds to its own operating wavelength. Receiving only the signals that do; therefore, each RRU can receive its own signal accurately, and when one RRU fails, the operation of the other RRUs is unaffected, which greatly improves system reliability. ..

In addition, in the prior art, all RRU data must pass through the CPRI interface of the first RRU, and therefore there is a relatively high demand for the bandwidth of the CPRI interface, which increases costs; and If the bandwidth of the CPRI interface is limited, the number of levels of cascade RRU is limited. In addition, the increased bandwidth of the CPRI interface also increases the demand for the speed of the optical transceiver, which further increases the cost.

However, after the above solution has been used, each RRU receives its own signal without the need to transfer the signal of another RRU, thereby reducing the CPRI bandwidth requirement and cost. And does not impose any restrictions on the number of levels of cascade RRU. In addition, each RRU no longer needs to be provided with two CPRI interfaces, which further reduces costs. In addition, the reduced demand on the bandwidth of the CPRI interface further reduces the demand on the speed of the optical transceiver, which further reduces the cost.

Although some preferred embodiments of the present invention have been described, those skilled in the art can make changes and modifications to these embodiments once they understand the basic concept of the invention. Therefore, the following claims are intended to be construed as spanning suitable embodiments and all modifications and modifications within the scope of the present invention.

Obviously, one of ordinary skill in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. The present invention is intended to extend to these modifications and variations, as long as they are within the scope of protection defined by the following claims and equivalent techniques.

10, 90 Baseband processing unit (BBU)
20 Optical multiplexer
30, 31, 32, 33, 50, 51, 52, 53, 93, 94, 95, 96 optical transceivers
40, 41, 42, 43, 91, 92 Remote Radio Unit (RRU)
60, 61, 62 optical splitter
70 optical fiber
100, 200, 300, 400 wireless communication system
500 wireless radio frequency device

Claims (9)

M primary optical transceivers configured to perform photoelectric conversion, said photoelectric conversion comprising conversion of an optical signal to an electrical signal and conversion of an electrical signal to an optical signal. The operating wavelengths of the first optical transceivers are different from each other, and M is an integer of 2 or more.
With at least one optical splitter connecting the M first optical transceivers to one optical fiber
An optical multiplexer that is connected to at least one optical splitter through an optical fiber,
The M second optical transceivers corresponding to the M first optical transceivers and connected to the optical multiplexer, and the operating wavelengths of the M second optical transceivers are different from each other and correspond to each other. With respect to the first optical transceiver and the second optical transceiver, the operating wavelength of the first optical transceiver includes M second optical transceivers that match the operating wavelength of the second optical transceiver .
The M first optical transceivers are single-core bidirectional optical transceivers, and the operating wavelength of each first optical transceiver includes a transmission wavelength and a reception wavelength, and the transmission wavelength and the reception wavelength are different and optical. Used to transmit and receive signals, respectively ,
The M second optical transceivers are single-core bidirectional optical transceivers, and the operating wavelength of each second optical transceiver includes a transmission wavelength and a reception wavelength, and the transmission wavelength and the reception wavelength are different and optical. Used to transmit and receive signals, respectively,
For the corresponding first optical transceiver and the second optical transceiver, the transmission wavelength of the first optical transceiver is the same as the reception wavelength of the second optical transceiver, and the reception wavelength of the first optical transceiver is the same. to be the same as with the transmission wavelength of said second optical transceiver, device. The apparatus according to claim 1, wherein the optical splitter is a 1: N optical splitter, where N is an integer greater than or equal to 2 and less than or equal to M. The optical splitter is a 1: 2 optical splitter, the number of optical splitters is M-1, and each optical splitter has three interfaces.
One interface of the first optical splitter is configured to receive multiple links of optical signals, and the other two interfaces are the first optical transceiver and the second optical of the M first optical transceivers. It is individually connected to the splitter and
One interface of the i-th optical splitter is connected to the (i-1) th optical splitter, and the other two interfaces are the i-th optical transceiver of the M first optical transceiver and (i + 1). It is individually connected to the second optical splitter, where 2 ≤ i ≤ M-2,
One interface of the (M-1) th optical splitter is connected to the (M-2) th optical splitter, and the other two interfaces are the (M-1) th of the M first optical transceivers. The device of claim 2, which is individually connected to the optical transceiver and the Mth optical transceiver. The device of claim 3, wherein when M is greater than 2, the M-1 optical splitters are connected to each other by a single core optical fiber. The apparatus according to any one of claims 1 to 4 , wherein the optical fiber is a single-core optical fiber. The device according to any one of claims 1 to 5.
A radio radio frequency device comprising M remote radio units individually connected to the M primary optical transceivers in the device. The device of claim 6 , wherein each optical splitter is located in the maintenance cavity of the corresponding remote radio unit. The device according to any one of claims 1 to 5.
With M remote radio units individually connected to the M primary optical transceivers in the device,
A wireless communication system including a baseband processing unit connected to the M second optical transceivers in the device. The device of claim 8 , wherein each optical splitter is located in the maintenance cavity of the corresponding remote radio unit.

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