JP2019118118A - Wireless communication system and wireless radio frequency device - Google Patents

Abstract

To provide a wireless communication system and a wireless radio frequency device.SOLUTION: A wireless communication system 100 includes a baseband processing unit, an optical multiplexer, and M first optical transceivers, and a wireless radio frequency device 500. The M first optical transceivers are provided between the baseband processing unit and the optical multiplexer. Each of the M first optical transceivers has a different operation wavelength. M is an integer of 2 or higher. The wireless radio frequency device includes M remote wireless units, M second optical transceivers, and at least one optical splitter. An operation wavelength of the first optical transceiver matches an operation wavelength of the second optical transceiver corresponding to the first optical transceiver. The M second optical transceivers are connected to the same optical fiber by at least one optical splitter. The optical fiber is connected to the optical multiplexer and at least one optical splitter.SELECTED DRAWING: Figure 1

Description

  The present invention relates to the field of communication technology, in particular to a wireless communication system and a wireless radio frequency device.

  Many wireless networks use a distributed base station architecture in which remote radio units (RRUs) are connected by optical fiber to a baseband processing unit (BBU), and one BBU has multiple It can support RRU. In scenarios where multiple RRUs need to be connected to the same BBU of the same station, cascading multiple RRUs is a common network construction method.

  Hereinafter, a data transmission mode of the wireless communication system 900 in which one BBU supports two cascaded RRUs will be used as an example of the description. As shown in FIG. 5, in the downlink direction, the BBU 90 receives downlink data transmitted by the gateway, processes the downlink data, and transmits an optical transceiver through a Common Public Radio Interface (CPRI) (Optical transceiver) 93 transmits the processed downlink data, but the optical transceiver is also referred to as 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 to the optical transceiver 94 corresponding to the RRU 91 through the optical fiber; The downlink optical carrier signal is converted to a first downlink electrical signal and the first downlink electrical signal is sent to RRU 91; RRU 91 selectively receives a portion of the first downlink electrical signal and the remaining signal is Transmit to the optical transceiver 95; the optical transceiver 95 converts the remaining signal to a second downlink optical carrier signal and transmits the second downlink optical carrier signal to the optical transceiver 96 through the optical fiber; The downlink optical carrier signal is converted to a second downlink electrical signal, and the second downlink electrical signal is sent to RRU 92. In this way, downlink data received from the gateway can be transmitted to the mobile terminal using RRU 91 and RRU 92.

In the uplink direction, RRU 91 and RRU 92 separately receive the uplink data sent by the mobile terminal and process the uplink data to obtain uplink electrical signals. The RRU 92 transmits the acquired first uplink electrical signal to the optical transceiver 96 corresponding to the RRU 92; the optical transceiver 96 converts the first uplink electrical signal into a first uplink optical carrier signal, and transmits the first uplink electrical signal through the optical fiber The uplink optical carrier signal is transmitted to the optical transceiver 95 corresponding to the RRU 91; the optical transceiver 95 converts the first uplink optical carrier signal into the second uplink electrical signal and transmits the second uplink electrical signal to the RRU 91 RRU 91 integrates the second uplink electrical signal into the uplink electrical signal acquired by RRU 91 to obtain the third uplink electrical signal, and the third uplink electrical signal to the optical transceiver 94 connected to RRU 91 Transmit; optical transceiver 94 converts the third uplink electrical signal to a second uplink optical carrier signal, and BBU 90 transmits a second uplink optical carrier The second uplink optical carrier signal is transmitted to the BBU 90 through an optical fiber so that the signal is processed and transmitted to the gateway, the processed second uplink optical carrier signal.
The RRU 91 needs to transfer data transmitted to and received from the RRU 92, and it can be understood that the RRU 92 will not operate when the RRU 91 fails.

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

  Thus, the existing network structure of the distributed base station has the following disadvantages: When one RRU of the cascade RRU (referred to as the current RRU) fails, the next RRU does not operate, thereby system reliability Decreases.

  In view of this, embodiments of the present invention provide a wireless communication system and a wireless radio frequency unit, which are configured to select the next RRU when the RRU of a plurality of cascade RRUs fails in the existing distributed base station architecture. Solve the technical problem of unreliability of the system caused by the inability to operate.

  The first aspect provides a wireless radio frequency device, wherein the wireless radio frequency device comprises: M remote radio units, M optical transceivers, and at least one optical splitter, where M is two or more. M optical transceivers are individually connected to the M remote radio units, and the operating wavelengths of the M optical transceivers are different from each other; the M optical transceivers are at least one optical splitter Are connected to the same optical fiber.

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

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

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

  Referring to any of the first to fourth possible embodiments of the first aspect or the first aspect, in the fifth possible embodiment of the first aspect, the first optical transceiver and the second optical transceiver The operating wavelength of each of the optical transceivers includes the receiving wavelength and the transmitting wavelength.

  A second aspect of the specification provides a wireless communication system, wherein the wireless communication system includes: a baseband processing unit, an optical multiplexer, M first optical transceivers, and a wireless radio frequency device, M first optical transceivers are provided between the baseband control unit and the optical multiplexer, the operating wavelengths of the M first optical transceivers are different from one another, and M is an integer of 2 or more; radio radio frequency The apparatus comprises: M remote radio units, M second optical transceivers, and at least one optical splitter, wherein the M second optical transceivers are connected to the M remote radio units, M individually correspond to the first optical transceivers, and the operating wavelength of the first optical transceiver matches the operating wavelength of the second optical transceiver corresponding to the first optical transceiver; M The second optical transceiver is connected to the same optical fiber by at least one optical splitter, the optical fiber is connected to an optical multiplexer and at least one optical splitter.

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

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

  Referring 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.

  Referring to the first to fourth possible implementation methods of the second aspect or the second aspect, in the fifth possible implementation method of the second aspect, each light of the first optical transceiver and the second optical transceiver is The operating wavelengths of the transceiver include the receiving wavelength and the transmitting wavelength.

  Referring to the fifth possible implementation method of the second aspect, in the sixth possible implementation method of the second aspect, the operating wavelength of the first optical transceiver corresponds to the first optical transceiver. To match the operating wavelength: 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 It includes that the reception wavelength of one optical transceiver is the same as the transmission wavelength of the second optical transceiver.

  In the wireless communication system herein, optical signals of different RRUs are transmitted (including transmission from RRU to BBU and transmission from BBU to RRU) by using different wavelengths, and thus the optical transceivers of cascade RRU are different. Operate at the wavelength. In addition, optical splitters are further provided, and the optical transceivers of these cascade RRUs are all connected to the optical splitters and connected to the same optical fiber by the optical splitters. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to the optical transceivers of all the RRUs using optical splitters, each optical transceiver corresponding to its own operating wavelength Therefore, each RRU can receive its own signal correctly, and when an RRU fails, the operation of the other RRUs is not affected, thereby greatly improving system reliability. Solve the technical problem of unreliability of the system caused by the inability of all the following RRUs to operate when remote radio units of multiple cascaded remote radio units fail in the existing distributed base station architecture.

  In addition, after the above solution is used, each RRU receives its own signal without the need to transfer another RRU's signal, thereby reducing the demand for CPRI interface bandwidth. Reduce the cost and do not impose any limitations on the number of levels of cascade RRUs. Furthermore, each RRU no longer needs to be provided with two CPRI interfaces, which further reduces costs. In addition, the reduction in the demand for bandwidth of the CPRI interface further reduces the demand for speed of the optical transceiver, which further reduces the cost.

  BRIEF DESCRIPTION OF DRAWINGS To describe the technical solutions in the embodiments of the present invention or in the prior art more clearly, the accompanying drawings required for describing the embodiments are briefly introduced below. Apparently, the accompanying drawings in the following description show only some embodiments of the present invention.

FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention. FIG. 7 is a schematic structural diagram of a wireless communication system according to another embodiment of the present invention. FIG. 7 is a schematic structural diagram of a wireless communication system according to still another embodiment of the present invention. FIG. 7 is a schematic structural diagram of a wireless communication system according to still another embodiment of the present invention. FIG. 1 is a schematic structural view of a 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, When an RRU fails, all subsequent RRUs can not operate, resulting in reduced system reliability.

  Here, based on a thorough examination of this problem, optical signals of different RRUs are transmitted by using different wavelengths (including transmission from RRU to BBU and transmission from BBU to RRU) and thus cascaded The RRU's optical transceivers operate at different wavelengths. In addition, optical splitters are further provided, and the optical transceivers of these cascade RRUs are all connected to the optical splitters and connected to the same optical fiber by the optical splitters. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to the optical transceivers of all the RRUs using optical splitters, each optical transceiver corresponding to its own operating wavelength Therefore, each RRU can receive its own signal correctly, and when an RRU fails, the operation of the other RRUs is not affected, thereby greatly improving system reliability. .

  In addition, in the prior art, data of all RRUs need to pass through the CPRI interface of the first RRU, thus there is a relatively high demand on the bandwidth of the CPRI interface, which increases the cost; If the bandwidth of the CPRI interface is limited, the number of levels of cascade RRUs is limited. In addition, the increased bandwidth of the CPRI interface also increases the speed requirement of the optical transceiver, which further increases the cost.

  However, after the above solution is used, each RRU receives its own signal without the need to transfer another RRU's signal, thereby reducing the demand for CPRI interface bandwidth. It reduces costs and does not create any limitations on the number of levels of cascade RRUs. Furthermore, each RRU no longer needs to be provided with two CPRI interfaces, which further reduces costs. In addition, the reduction in the demand for bandwidth of the CPRI interface further reduces the demand for speed of the optical transceiver, which further reduces the cost.

  The technical solution herein not only solves the unreliability problem in the prior art, but also greatly reduces the cost and does not create any limit on the number of levels of cascade RRU.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS For a person skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. . Apparently, the described embodiments are merely a part rather than 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 wireless communication system 100 includes: a baseband processing unit 10, an optical multiplexer 20, optical transceivers 31 and 32, and a wireless radio frequency device 500, wherein the wireless radio frequency device 500 It includes remote radio units 41 and 42, optical transceivers 51 and 52, and an optical splitter 60.

  Although the baseband processing unit 10 is abbreviated as BBU, the full name is Baseband Control Unit, also referred to as a baseband control unit. The BBU 10 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 transmitting and receiving data, includes an interface between the BBU and the core network / controller, and an interface between the BBU and the high frequency module, and the BBU and the high frequency module The interface between and may be a Common Public Radio Interface (CPRI) interface or an Open Base Station Architecture (OBASI) interface. In this implementation, the BBU 10 includes two interfaces, ie the number of interfaces is the same as the number of remote radio units 40. The power supply module is configured to supply the BBU 10 with the required power.

  The baseband subsystem is mainly configured to perform baseband processing functions of uplink and downlink data, and mainly includes uplink processing modules and downlink processing modules. The uplink processing module is configured to demodulate 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, for example, have one or more of the following functions: device management, configuration management, alarm management, Software management and operation and maintenance functions such as debugging and inspection management; Signal processing functions such as logic resource management; GPS clock phase locking, frequency division execution, phase locking and phase adjustment, and clock provision, etc. Meet the whole base station, clock module function.

  The remote radio unit is abbreviated RRU, but the full name is Radio Remote Unit. The RRU transmits to the antenna feeder, received from the BBU 10, subjected to frequency conversion, filtering, high frequency filtering, passed through a linear power amplifier, to transmit a downlink baseband signal, or on an uplink signal received from a mobile terminal. Are configured to perform filtering, additional high frequency small signal amplification and filtering, down conversion, analog to digital conversion, digital intermediate frequency processing, and so on. Each RRU is communicably connected to the BBU 10 using one interface.

  The optical multiplexer 20 is abbreviated as MUX, but the full name is optical multiplexer. The optical multiplexer 20 is an apparatus for combining and separating several optical carrier signals having different wavelengths, and for transmitting several optical carrier signals having different wavelengths on one optical fiber or plural ones. Individual optical carrier signals may be incorporated into the plurality of optical carrier signals to transmit the plurality of optical carrier signals through the optical fiber of The optical multiplexer 20 generally includes multiple input interfaces and one output interface. In this implementation, the optical multiplexer 20 includes two input interfaces and one output interface, and both the input and output interfaces are single core bidirectional interfaces. In another implementation, the interface may be a dual core bidirectional interface.

  An optical transceiver whose English full name is optical transceiver is also referred to as an optical module, and is configured to perform photoelectric conversion, and the photoelectric conversion referred to in the present specification includes conversion of an optical signal to an electrical signal. But also includes conversion of electrical signals to optical signals. Optical transceivers 31 and 32 are provided between BBU 10 and optical multiplexer 20, and optical transceiver 31 is connected to one input interface of one optical multiplexer 20 and one CPRI interface of BBU 10, and optical transceiver 32 is an optical The other input interface of the multiplexer 20 and the other CPRI interface of the BBU 10 are connected. The optical transceivers 51 and 52 are connected to the RRUs 41 and 42 respectively, that is, the optical transceiver 51 is connected to the RRU 41, and the optical transceiver 52 is connected to the RRU 42.

  Optical transceivers generally include optoelectronic devices, functional circuits, optical interfaces, and the like, and optoelectronic devices include light emitting portions and light receiving portions. The light emitting part is realized as follows: a semiconductor laser device for emitting a modulated optical signal having a corresponding speed after an electrical 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 optoelectronic device so as to drive the (LD) or light emitting diode (LED) where the output level of the output light signal is kept constant. 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 to an electrical signal by the photodetector diode; the head amplifier amplifies the electrical signal, Output an electrical signal of the corresponding bit rate. In short, the function of the optical transceiver is photoelectric conversion.

  Each optical transceiver connected to the BBU 10 corresponds to one RRU, and each RRU is provided with one optical transceiver corresponding to the RRU. The operating wavelengths of the optical transceivers corresponding to the same RRU coincide with each other, and the operating wavelengths of the optical transceivers corresponding to different RRU are different. For example, the operating wavelengths of the optical transceivers 31 and 51 corresponding to RRU 41 coincide with each other. The operating wavelengths of the corresponding optical transceivers 32 and 52 are also identical to 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. Ensures that only the signal corresponding to its own operating wavelength is received. The fact that the operating wavelengths mentioned here are matched to one another means that the transmission wavelength of one optical transceiver is the same as the reception wavelength of another optical transceiver, another optical transceiver being transmitted by the optical transceiver It is possible to receive an optical signal. 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.

  Additionally, the optical transceivers described above may be dual core bi-directional optical transceivers or single core bi-directional optical transceivers. When the optical transceivers are dual core bidirectional optical transceivers, each optical transceiver has one operating wavelength, which is not only used for transmission but also for reception; optical transceivers are single core bidirectional optical When it is a transceiver, each optical transceiver has two operating wavelengths, including a transmitting wavelength and a receiving wavelength. In this implementation, as an example, the optical transceiver is a single core bi-directional optical transceiver, ie transmission and reception are combined to be performed on one optical fiber, to transmit and receive optical signals Different wavelengths are used.

  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. Furthermore, 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 optical signals transmitted by different optical transceivers are It is intended to guarantee that it can be received by different RRUs. In addition, since the above optical transceiver is a single core bi-directional optical transceiver, the transmission wavelength λ1 and the reception wavelength λ2 of the optical transceiver 31 are different, and the transmission wavelength λ3 and the reception wavelength λ4 of the optical transceiver 32 are different; λ2, λ3 and λ4 are different from one another.

  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; accordingly, when the transmission wavelength of the optical transceiver 31 is λ1, the reception of the optical transceiver 31 is performed. The wavelength is λ2, the reception wavelength of the optical transceiver 51 is λ1, and 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 the optical splitter 60 to the optical fiber 70 connected to the optical multiplexer 20. Specifically, optical transceivers 51 and 52 may be connected to optical splitter 60 using an optical fiber such as, for example, a single core bi-directional optical fiber. Optical multiplexer 20 may also be connected to optical splitter 60 using, for example, an optical fiber such as a single core bi-directional optical fiber. The use of single core bi-directional fibers reduces costs compared to the use of dual core bi-directional fibers.

  The optical splitter 60, also referred to as an optical splitter, is one of the important passive components on the optical fiber 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 needed. As shown in FIG. 1, in this implementation, the number of RRUs is two, the number of optical splitters 60 is one, the number of optical multiplexers 20 is one, and in this case the optical splitters 60 are 1: It is a 2 light splitter. Or, as shown in FIG. 3 or FIG. 4, when a plurality of RRUs are connected in cascade, this means that each RRU is connected to the optical splitter 60 by one optical transceiver, 60 is also a 1: 2 light splitter. The cost of implementation is reduced since the 1: 2 optical splitter is small in volume and can be placed directly into the maintenance cavity of the RRU.

  In this implementation, the number of RRUs is two, the number of interfaces in BBU 10 is also two, and the number of optical transceivers connected to BBU 10 is also two, one optical between RRU and an optical splitter A transceiver is provided. In a particular implementation, the BBU 10 and the optical multiplexer 20 may be located in the equipment room, and the RRUs 41 and 42 may be remotely located at the outdoor station using optical fibers. The optical transceiver 31 is mounted on the interface 11 corresponding to the RRU 41 of the BBU 10, and the optical transceiver 32 is mounted on the interface 12 corresponding to the RRU 42 of the BBU 10. 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 may be provided in the maintenance cavity of the RRU 41.

  In the downlink direction, the BBU 10 modulates and encodes downlink baseband data and transmits the modulated and encoded downlink data to the optical transceivers 31 and 32 through the interface 11 and the interface 12; the optical transceivers 31 and 32 , Convert the received downlink data into optical carrier signals having different wavelengths, and transmit the optical carrier signals to the optical multiplexer 20; the optical multiplexer 20 transmits the optical carrier signals to the optical splitter 60 through the optical fiber , And the optical carrier signals from the 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 receive only the data transmitted to the optical multiplexer 20 by the optical transceiver 31; the reception wavelength of the optical transceiver 52 is the optical transceiver Equal to the 32 transmission wavelengths, the optical transceiver 52 can only receive 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 RRUs 41 and 42, respectively; RRUs 41 and 42 receive the high frequency filtering of the received signal to form a linear power amplifier. After passing, the reception signal is transmitted to the antenna feeder by transmission filtering.

  In the uplink direction, RRUs 41 and 42 filter, low noise amplifier, further high frequency small signal amplification and filtering, down conversion, analog to digital on the uplink signal received from the mobile terminal to generate the uplink electrical signal. Perform conversion, digital intermediate frequency processing, etc. and transmit uplink electrical signals to the optical transceivers 51 and 52, respectively; the optical transceivers 51 and 52 convert the received uplink electrical signals into uplink optical carrier signals. 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 so that 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, so that the data transmitted by the optical transceiver 52 can only be received by the optical transceiver 32. 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 optical multiplexer 20; 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 transmit the uplink data signals to the corresponding interface of the BBU 10 Transmit; BBU 10 demodulates and decodes the received uplink data signal and transmits the demodulated and decoded uplink data signal to the gateway.

  When RRU 41 fails, the signal of RRU 42 can be transmitted directly to optical splitter 60 and transmitted to BBU 10 using optical splitter 60, and the signal of BBU 10 can also be transmitted to RRU 42 using optical splitter 60 It can be seen that this can be done to ensure that the RRU 42 can operate properly.

  In the above radio communication system 100, the optical splitter 60 is provided between two RRUs, ie, the first RRU 41 and the second RRU 42, and even when the first RRU 41 fails, the signal of the second RRU 42 is an optical splitter. 60 can be transmitted directly to the BBU 10 using the optical splitter 60; the signal of the BBU 10 can also be transmitted to the second RRU 42 using the optical splitter 60, whereby the RRU 42 can be transmitted. Ensures that it can operate normally, which is an unreliable technology of the system caused by the inability of all the following RRUs to operate when the remote radio units of multiple cascade RRUs fail in the existing distributed base architecture Your social problems.

  In addition, all the links use different wavelengths for communication and are completely independent of each other, which also means that the communication bandwidths overlap when multiple RRUs are cascaded. It also solves the technical problem that the speed of the transceivers increases and the number of cascaded RRUs on the same link is limited.

Embodiment 2
Based on the same inventive idea, the specification further provides a wireless communication system 200. As shown in FIG. 2, the wireless communication system 200 differs from the wireless 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 implementation, the number of RRUs 40 is M, so M optical transceivers 50 are separately connected to M RRUs 40 and M optical transceivers 30 are M between BBU 10 and M RRUs 40. Provided on each interface. The optical splitter 60 may be a 1: N optical splitter, where M is an integer of 3 or more and N is an integer of 2 or more. The M RRUs 40 are individually connected to the optical splitter 60 by the M optical transceivers 50.

  In this implementation, N is equal to M, and optical splitter 60 is a 1: M optical splitter and has M + 1 interfaces, where the number of optical splitters is one. In this case, all RRUs 40 are connected to the optical splitter 60.

  In another implementation, N is different from M, for example, when N is equal to 2, 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 multiplexer 20 by an optical fiber so that it receives multiple links of the optical signal acquired by the optical multiplexer 20 by coupling, and the other two interfaces are the first The RRU 40 and the second optical splitter are connected separately; 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 second light splitter, where 2 ≦ i ≦ M−2; one interface of the last light splitter, ie the (M−1) th light splitter, is (M−2) The second interface is connected to the second optical splitter, and the other two interfaces are separately connected to the (M−1) th RRU and the Mth RRU.

  The principles of operation of the wireless communication system 200 described above are the same as those of the wireless communication system 100, and the details are not described herein again. When any RRU of the M RRUs 40 fails, the signals of the other RRUs can be transmitted directly to the optical splitter 60 and transmitted to the BBU 10 using the optical splitter 60, and the signals of the BBU 10 can also be transmitted. It can also be transmitted to another RRU 40 using the optical splitter 60, which ensures that the other RRU 40 can operate normally, but this is because RRUs of multiple cascade RRUs are already distributed It solves the technical problem of unreliability of the system caused by the failure of all the following RRUs in case of 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 overlap communication bandwidth when multiple RRUs are cascaded It also solves the technical problem that the speed of the optical transceiver increases and the number of cascaded RRUs on the same link is limited.

Embodiment 3
Based on the same inventive idea, the specification further provides a wireless communication system 300. As shown in FIG. 3, FIG. 3 is a schematic structural diagram of a wireless communication system 300 according to another embodiment of the present invention. The wireless communication system 300 differs from the wireless communication system 100 of FIG. 1 in the following points: the number of optical splitters 60 is two, the number of RRUs 40 is three, and thus the number of interfaces of BBU 10 is also three. , And the number of optical transceivers 30 connected to the BBU 10 is three, and the number of optical transceivers 50 connected to the RRU 40 is also three.

  The number of optical splitters 60 is one less than the number of RRUs 40, that is, there are two optical splitters 60, which are optical transceivers 61 and 62. The optical splitter 61 is connected to the optical multiplexer 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 the optical splitter 62 by the optical transceiver 53. It is connected to the.

  In a particular implementation, the BBU 10 and the optical multiplexer 20 may be located in the equipment room, and the three RRUs 40 may be remotely located at the outdoor station using optical fibers. The optical transceiver 31 is mounted on the interface 11 of the BBU 10 corresponding to the RRU 41; the optical transceiver 32 is mounted on the interface 12 corresponding to the second RRU 42 of the BBU 10; the optical transceiver 33 is of the BBU 10 It is mounted on the interface 13 corresponding to the third RRU 43. The optical transceiver 51 is mounted on the RRU 41, the optical transceiver 52 is mounted on the RRU 42, and the optical transceiver 53 is mounted on the RRU 43. The optical splitter 61 is disposed in the maintenance cavity of the remote radio unit 41, and the optical splitter 62 is disposed in the maintenance cavity of the RRU 42.

  In the downlink direction, the BBU 10 modulates and encodes downlink baseband data and transmits the modulated and encoded downlink data to the optical transceivers 31, 32, and 33 through the interface 11, the interface 12, and the interface 13. Optical transceivers 31, 32, and 33 convert the received downlink data into optical carrier signals having different wavelengths, and transmit the optical carrier signals to the optical multiplexer 20; the optical multiplexer 20 receives the received optical carriers The signals are integrated on one optical fiber and the optical carrier signals are transmitted to the three optical transceivers 50 through the optical splitter 60; the three optical transceivers 50 selectively receive data corresponding to the wavelength according to the wavelength. The receiving wavelength of the optical transceiver 51 is equal to the transmitting wavelength of the optical transceiver 31, and the optical transceiver 51 can receive only the data transmitted by the optical transceiver 31; the receiving wavelength of the optical transceiver 52 is the transmitting wavelength of the optical transceiver 32 , The optical transceiver 52 can receive only 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 Data can only 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 RRUs 40, which, after high frequency filtering of the signals through the linear power amplifier, Transmit the received signal to the antenna feeder by transmission filtering.

  In the uplink direction, the three RRUs 40 filter, low noise amplifier, additional high frequency small signal amplification and filtering, down conversion, analog-to-digital, on the uplink signal received from the mobile terminal to generate an uplink electrical signal. Perform conversion, digital intermediate frequency processing, etc. and transmit uplink electrical signals to the three optical transceivers 50; the three optical transceivers 50 convert the received uplink electrical signals into uplink optical carrier signals. The three optical transceivers 50 have different transmission wavelengths, wherein 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 is received only by the optical transceiver 31 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 receiving wavelength of the optical transceiver 33, the data transmitted by the optical transceiver 53 can be received only by the optical transceiver 33. Optical splitters 61 and 62 couple the three links of the uplink optical carrier signal onto 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 the optical transceivers 31, 32, and 33; after separately 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 BBU 10 respectively; BBU 10 demodulates and decodes the received uplink data signal, and demodulates and decodes the uplink data signal Transmit to the gateway.

  It can be seen that in the above embodiment, optical signals of different RRUs are transmitted by using different wavelengths, thus the optical transceivers of the cascade RRU operate at different wavelengths. Optical splitters are further provided, and the optical transceivers of these cascade RRUs are all connected to the optical splitters and connected to the same optical fiber 70 by the optical splitters. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to the optical transceivers of all the RRUs using optical splitters, each optical transceiver corresponding to its own operating wavelength Therefore, each RRU can correctly receive its own signal, and when one RRU fails, the operation of the other RRUs is not affected. For example, when RRU 41 fails, the signals of RRUs 42 and 43 can be transmitted directly to BBU 10 using optical splitter 61, and the signals of BBU 10 are also transmitted to RRU 42 and RRU 43 using optical splitter 61. It is possible to ensure that the RRUs 42 and 43 can operate properly. When both RRU 41 and RRU 42 fail, RRU 43 can transmit a signal to BBU 10 using optical splitters 62 and 61, and the signal of BBU 10 is also transmitted to RRU 43 using optical splitters 61 and 62. This is possible, which solves the technical problem of unreliability of the system caused by the inability of all the following RRUs to operate when one of the cascaded RRUs fails in the existing distributed base architecture.

  In addition, in addition, all links use different wavelengths for communication and are completely independent of each other, which also overlap communication bandwidth when multiple RRUs are cascaded It also solves the technical problem that the speed of the optical transceiver increases and the number of cascaded RRUs on the same link is limited.

Embodiment 4
Based on the same inventive idea, the specification further provides a wireless communication system 400. As shown in FIG. 4, FIG. 4 is a schematic structural diagram of a wireless communication system 400 according to still another embodiment of the present invention. The wireless communication system 400 differs from the wireless communication system 100 of FIG. 2 in the following points: the number of RRUs 40, the number of optical splitters 60, and the number of optical transceivers 50. In this implementation, the number of RRUs 40 is M, where M is greater than 3; therefore, M optical transceivers 50 are separately connected to M RRUs 40 and M optical transceivers 30 are BBU 10 and M It is provided on M interfaces between RRUs 40. The optical splitters 60 are 1: 2 optical splitters, and the number of optical splitters 60 is M−1, where M optical splitters 60 are cascaded using a single core optical fiber 70.

  One interface of the first optical splitter 60 is connected by the optical fiber 70 to the optical multiplexer 20 to receive multiple links of the optical signal acquired by the optical multiplexer 20 by coupling, and the other two interfaces are 1 It is separately connected to the second RRU 40 and the second optical splitter 60; one interface of the ith optical splitter 60 is connected to the (i-1) th optical splitter 60 and the other two interfaces are the ith RRU and the (i + 1) th optical splitter 60 separately, where 2 ≦ i ≦ M−2; the last optical splitter 60, ie, one 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 connected individually to the (N-1) th RRU 40 and the Nth RRU 40.

  In a particular implementation, the BBU 10 and the optical multiplexer 20 may be located in the equipment room, and the M RRUs 40 may be remotely located at the outdoor station using optical fibers. The first optical transceiver 30 is mounted on the interface 1 corresponding to the first RRU 40 of the BBU 10; the j-th optical transceiver 30 is mounted on the interface j corresponding to the j-th RRU 40 of the BBU 10 , Where 1 <j <M; the Mth optical transceiver 30 is implemented on the interface M corresponding to the Mth RRU 40 of the BBU 10. The first optical transceiver 50 is mounted on the first RRU 40, and the j-th optical transceiver is mounted on the j-th RRU 40, where 1 <j <M, and the M-th optical transceiver 50 is the M-th It is implemented on RRU 40. In addition, the first optical splitter 60 may be disposed in the maintenance cavity of the first RRU 40, and the ith optical splitter 60 may be disposed in the maintenance cavity of the ith RRU 40, here , And the (M−1) th optical splitter 60 may be placed in the maintenance cavity of the (M−1) th RRU 40. However, this embodiment is not limited to this, and the light splitters 60 may be arranged independently or otherwise.

  In the downlink direction, the BBU 10 modulates and encodes downlink baseband data, and transmits the modulated and encoded downlink data to M optical transceivers 30; the M optical transceivers 30 receive the received downlink The data is converted into optical carrier signals having different wavelengths and the optical carrier signals are sent to the optical multiplexer 20; the optical multiplexer 20 incorporates the received optical carrier signals on one optical fiber and carries the optical carrier through the optical splitter 60 The signals are 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 individually converting the received signal to downlink electrical signals, the M optical transceivers 50 transmit the downlink electrical signals to the M RRUs 40; the M RRUs 40 receive high frequency filtering of the received signals to achieve linear power. After passing through the amplifier, transmit filtering individually transmits the received signal to the antenna feeder.

  In the uplink direction, the M RRUs 40 filter, low noise amplifier, further high frequency small signal amplification and filtering, down conversion, analog on the uplink signal received from the mobile terminal to generate an uplink electrical signal. Perform digital conversion, digital intermediate frequency processing, etc., and transmit uplink electrical signals accordingly to M optical transceivers 50; M optical transceivers 50 receive uplink electrical signals as uplink optical carrier signals And transmit the uplink optical carrier signal 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, ie, 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 the 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, The separated optical carrier signals are individually sent 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 BBU 10; The BBU 10 demodulates 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 embodiment, optical signals of different RRUs are transmitted by using different wavelengths, thus the optical transceivers of the cascade RRU operate at different wavelengths. Optical splitters are further provided, and the optical transceivers of these cascade RRUs are all connected to the optical splitters and connected to the same optical fiber by the optical splitters. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to the optical transceivers of all the RRUs using optical splitters, each optical transceiver corresponding to its own operating wavelength Therefore, each RRU can correctly receive its own signal, and when one RRU fails, the operation of the other RRUs is not affected. For example, when the first RRU fails, another RRU's signal can be transmitted directly to the BBU 10 using the optical splitter 60, and the BBU 10's signal is also transmitted to another RRU using the optical splitter 60. It can be done to ensure that another RRU can operate normally, but this will cause all of the next RRUs to fail when one of the cascaded RRUs fails in the existing distributed base architecture. Solve the technical problem of low reliability of the system caused by the inability to operate.

  In addition, in addition, all links use different wavelengths for communication and are completely independent of each other, which also overlap communication bandwidth when multiple RRUs are cascaded It also solves the technical problem that the speed of the optical transceiver increases and the number of cascaded RRUs on the same link is limited.

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 of 2 or more, and M RRUs,
M optical transceivers individually connected to the M RRUs, wherein the operating wavelengths of the M optical transceivers are different from one another;
At least one optical splitter, at least one optical splitter connects M optical transceivers to the same optical fiber, that is, M optical transceivers are connected to the same optical fiber by at least one optical splitter At least one light splitter,
including.

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

  Preferably, the light splitters are 1: 2 light splitters and the number of light splitters is M-1.

  Preferably, when M is greater than 2, the M-1 optical splitters are connected together 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 the receiving wavelength and the transmitting wavelength.

  In an embodiment, optical signals of different RRUs are transmitted by using different wavelengths (including transmission from RRU to BBU and transmission from BBU to RRU), so that the optical transceivers of cascade RRU operate at different wavelengths. I understand. In addition, optical splitters are further provided, and the optical transceivers of these cascade RRUs are all connected to the optical splitters and connected to the same optical fiber by the optical splitters. In this way, the optical signals of multiple RRUs transmitted on the optical fiber can be transmitted to the optical transceivers of all the RRUs using optical splitters, each optical transceiver corresponding to its own operating wavelength Therefore, each RRU can receive its own signal correctly, and when an RRU fails, the operation of the other RRUs is not affected, thereby greatly improving system reliability. .

  In addition, in the prior art, data of all RRUs need to pass through the CPRI interface of the first RRU, thus there is a relatively high demand on the bandwidth of the CPRI interface, which increases the cost; If the bandwidth of the CPRI interface is limited, the number of levels of cascade RRUs is limited. In addition, the increased bandwidth of the CPRI interface also increases the speed requirement of the optical transceiver, which further increases the cost.

  However, after the above solution is used, each RRU receives its own signal without the need to transfer another RRU's signal, thereby reducing the CPRI bandwidth requirements and cost. There is no limit on the number of levels of cascade RRUs. Furthermore, each RRU no longer needs to be provided with two CPRI interfaces, which further reduces costs. In addition, the reduction in the demand for bandwidth of the CPRI interface further reduces the demand for speed of the optical transceiver, which further reduces the cost.

  Although several preferred embodiments of the present invention have been described, one of ordinary skill in the art can make changes and modifications to these embodiments once the basic inventive concept is understood. Accordingly, the following claims are intended to be construed as extending to the preferred embodiments and all changes and modifications that are within the scope of the present invention.

  Clearly, 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 cover these modifications and variations provided that they fall within the scope of protection defined by the following claims and their equivalents.

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 light splitter
70 optical fiber
100, 200, 300, 400 wireless communication systems
500 radio radio frequency devices

Although the baseband processing unit 10 is abbreviated as BBU, the full name is Baseband Control Unit, also referred to as a baseband control unit. The BBU 10 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 transmitting and receiving data, includes an interface between the BBU and the core network / controller, and an 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 implementation, the BBU 10 includes two interfaces, ie the number of interfaces is the same as the number of remote radio units 40. The power supply module is configured to supply the BBU 10 with the required power.

Embodiment 4
Based on the same inventive idea, the specification further provides a wireless communication system 400. As shown in FIG. 4, FIG. 4 is a schematic structural diagram of a wireless communication system 400 according to still another embodiment of the present invention. The wireless communication system 400 differs from the wireless communication system 100 of FIG. 2 in the following points: the number of RRUs 40, the number of optical splitters 60, and the number of optical transceivers 50. In this implementation, the number of RRUs 40 is M, where M is greater than 3; therefore, M optical transceivers 50 are separately connected to M RRUs 40 and M optical transceivers 30 are BBU 10 and M It is provided on M interfaces between RRUs 40. The optical splitters 60 are 1: 2 optical splitters, and the number of optical splitters 60 is M−1, where M−1 optical splitters 60 are cascaded using a single core optical fiber 70.

One interface of the first optical splitter 60 is connected by the optical fiber 70 to the optical multiplexer 20 to receive multiple links of the optical signal acquired by the optical multiplexer 20 by coupling, and the other two interfaces are 1 It is separately connected to the second RRU 40 and the second optical splitter 60; one interface of the ith optical splitter 60 is connected to the (i-1) th optical splitter 60 and the other two interfaces are the ith RRU and the (i + 1) th optical splitter 60 separately, where 2 ≦ i ≦ M−2; the last optical splitter 60, ie, one of the (M−1) th optical splitter 60. one interface is connected individually (M-2) -th are connected to the optical splitter 60, the other two interfaces (M-1) -th RRU40 and M th RRU40.

Claims (13)

A wireless radio frequency device, said wireless radio frequency device comprising
M remote wireless units, where M is a remote wireless unit, where M is an integer greater than or equal to 2;
M optical transceivers individually connected to the M remote radio units, wherein the operating wavelengths of the M optical transceivers are different from each other;
At least one optical splitter, wherein the M optical transceivers are connected to the same optical fiber by the at least one optical splitter;
A radio radio frequency device comprising:   The apparatus according to claim 1, wherein the light splitter is a 1: N light splitter, N being an integer greater than or equal to 2 and less than or equal to M.   3. The apparatus of claim 2, wherein the light splitters are 1: 2 light splitters and the number of light splitters is M-1.   4. The apparatus of claim 3, wherein when M is greater than 2, the M-1 optical splitters are connected together by a single core optical fiber.   5. An apparatus according to any one of the preceding claims, wherein the optical fiber is a single core optical fiber.   The apparatus according to any one of the preceding claims, wherein the operating wavelength of each optical transceiver of the first optical transceiver and the second optical transceiver comprises a receiving wavelength and a transmission wavelength. A wireless communication system, said wireless communication system comprising
A baseband processing unit,
An optical multiplexer,
M first optical transceivers provided between the baseband processing unit and the optical multiplexer, wherein the operating wavelengths of the M first optical transceivers are different from each other, and M is 2 or more M first optical transceivers, which are integers,
Radio radio frequency device,
Equipped with
The wireless radio frequency device is
M remote radio units,
M second optical transceivers individually connected to the M remote radio units and individually corresponding to the M first optical transceivers, wherein an operating wavelength of the first optical transceiver is the first optical transceivers M second optical transceivers, corresponding to the operating wavelength of the second optical transceiver corresponding to the optical transceivers,
At least one optical splitter, wherein the M second optical transceivers are connected to the same optical fiber by the at least one optical splitter, the optical fiber being in one of the optical multiplexer and the at least one optical splitter At least one light splitter connected;
A wireless communication system comprising:   The wireless communication system according to claim 7, wherein the optical splitter is a 1: N optical splitter, and N is an integer of 2 or more and M or less.   The wireless communication system according to claim 8, wherein the optical splitter is a 1: 2 optical splitter, and the number of optical splitters is M-1.   10. The wireless communication system of claim 9, wherein when M is greater than 2, the M-1 optical splitters are connected together by a single core optical fiber.   The wireless communication system according to any one of claims 7 to 10, wherein the optical fiber is a single core optical fiber.   The wireless communication system according to any one of claims 7 to 11, wherein an operating wavelength of each optical transceiver of the first optical transceiver and the second optical transceiver comprises a reception wavelength and a transmission wavelength. That the operating wavelength of the first optical transceiver matches the operating wavelength of the second optical transceiver corresponding to the first optical transceiver:
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; the first optical transceiver The system according to claim 12, wherein the receiving wavelength of is the same as the transmitting wavelength of the second optical transceiver.

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