A remote unit protection system

Abstract

The present application provides a remote unit protection system, which relates to the field of communication technology and can solve the technical problem of how to ensure that the coverage of mobile communication signals is not affected when an optical cable fails. The present application includes: a first aggregation site connects m first remote sites and n second remote sites in a chain-like manner through a first single-core optical fiber along the direction from the first aggregation site to the second aggregation site; a second aggregation site connects n second remote sites and m first remote sites in a chain-like manner through a second single-core optical fiber along the direction from the second aggregation site to the first aggregation site; a PON protection device and a remote unit are deployed on each of the m first remote sites and the n second remote sites; the PON protection device is configured to control the PON protection device to switch the interface of the single-core optical fiber when detecting that the received optical power is lower than a threshold value, so that the remote unit corresponding to the PON protection device switches the aggregation site for signal transmission.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a remote unit protection system. Background Art

[0002] At present, in scenarios such as high-speed railways, highways, and urban roads, the processing unit pool of mobile communications usually uses chain optical cables to connect remote base stations of mobile communications to provide mobile communication signal coverage.

[0003] However, since many remote base stations do not have dual-route optical cables converging to the processing unit pool at the same site, when an optical cable fails, all chain-connected mobile communication remote base stations after the optical cable failure site are often disconnected from the network. Mobile communication operators not only lose business revenue, but more importantly, their corporate reputation is seriously damaged. Summary of the Invention

[0004] The present application provides a remote unit protection system that can solve the technical problem of how to ensure that the coverage of mobile communication signals is not affected when an optical cable fails.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, a remote unit protection system includes: a first aggregation site and a second aggregation site;

[0007] The first aggregation site is connected to m first remote sites and n second remote sites in a chain manner through a first single-core optical fiber along the direction from the first aggregation site to the second aggregation site; the second aggregation site is connected to n second remote sites and m first remote sites in a chain manner through a second single-core optical fiber along the direction from the second aggregation site to the first aggregation site; the m first remote sites belong to the first aggregation site; the n second remote sites belong to the second aggregation site; m and n are positive integers;

[0008] A passive optical network (PON) protection device and a remote unit are deployed on each of the m first remote sites and the n second remote sites;

[0009] The PON protection device is used to control the PON protection device to switch the interface of the single-core optical fiber when detecting that the received optical power is lower than the threshold value, so that the remote unit corresponding to the PON protection device switches the aggregation site for signal transmission.

[0010] Optionally, the difference between m and n is less than or equal to 1;

[0011] A first type PON protection device is deployed on an adjacent first remote site and an adjacent second remote site; the adjacent first remote site is used to represent a first remote site adjacent to the first aggregation site among the m first remote sites; the adjacent second remote site is used to represent a second remote site adjacent to the second aggregation site among the n second remote sites;

[0012] A second type of PON protection device is deployed on the non-adjacent first remote site and the non-adjacent second remote site; the non-adjacent first remote site is used to represent the other first remote sites among the m first remote sites, excluding the adjacent first remote site; the adjacent second remote site is used to represent the other second remote sites among the n second remote sites, excluding the adjacent second remote site;

[0013] The first aggregation site includes: a first optical line terminal (OLT); a first end of the first OLT is connected to a first type PON protection device deployed at an adjacent first remote site via a first single-core optical fiber; the first end of the first OLT is used to bidirectionally transmit baseband signals with the first type PON protection device deployed at the adjacent first remote site;

[0014] The second aggregation site includes: a second OLT; a first end of the second OLT is connected to a first type PON protection device deployed on an adjacent second remote site via a second single-core optical fiber; the first end of the second OLT is used to bidirectionally transmit baseband signals with the first type PON protection device deployed on the adjacent second remote site.

[0015] Optionally, the first aggregation site further includes: a first base station protection controller, a first base station data storage device, and a first baseband processing unit pool;

[0016] The second end of the first OLT is connected to the first baseband processing unit pool; the second end of the first OLT is used to bidirectionally transmit baseband signals with the first baseband processing unit pool;

[0017] The third end of the first OLT is connected to the first base station protection controller; the third end of the first OLT is used to send interface switching information to the first base station protection controller; the interface switching information is used to indicate that the PON protection device switches the interface of the single-core optical fiber;

[0018] The first base station protection controller is connected to the first base station data storage; the first base station protection controller is configured to, upon receiving the interface switching information, send activation information to the first base station data storage, so that the first base station data storage activates the service configuration parameters of the remote unit corresponding to the interface switching information, and controls the first baseband processing unit pool to transmit a baseband signal to the remote unit corresponding to the interface switching information;

[0019] The second aggregation site also includes: a second base station protection controller, a second base station data storage, and a second baseband processing unit pool;

[0020] The second end of the second OLT is connected to the second baseband processing unit pool; the second end of the second OLT is used to bidirectionally transmit baseband signals with the second baseband processing unit pool;

[0021] The third end of the second OLT is connected to the second base station protection controller; the third end of the second OLT is used to send interface switching information to the second base station protection controller;

[0022] The second base station protection controller is connected to the second base station data storage device; the second base station protection controller is used to send activation information to the second base station data storage device after receiving the interface switching information, so that the second base station data storage device activates the service configuration parameters of the remote unit corresponding to the interface switching information, and controls the second baseband processing unit pool to transmit the baseband signal to the remote unit corresponding to the interface switching information.

[0023] Optionally, the first base station protection controller is specifically configured to:

[0024] Controlling the first baseband processing unit pool to optically transmit the baseband signal through the PON port of the first OLT;

[0025] When the optical transmission does not meet the preset capacity condition, controlling the first OLT to compress the baseband signal according to a preset ratio, and optically transmitting the compressed baseband signal through the PON port of the first OLT;

[0026] When the first baseband processing unit pool has an idle baseband signal, controlling the first baseband processing unit pool to optically transmit the baseband signal based on the idle baseband signal;

[0027] When the first baseband processing unit pool has no idle baseband signal, the first baseband processing unit pool is controlled to optically transmit the baseband signal based on the currently used baseband signal.

[0028] Optionally, the second base station protection controller is specifically configured to:

[0029] Controlling the second baseband processing unit pool to optically transmit the baseband signal through the PON port of the second OLT;

[0030] When the optical transmission does not meet the preset capacity condition, controlling the second OLT to compress the baseband signal according to a preset ratio, and optically transmitting the compressed baseband signal through the PON port of the second OLT;

[0031] When the second baseband processing unit pool has an idle baseband signal, controlling the second baseband processing unit pool to optically transmit the baseband signal based on the idle baseband signal;

[0032] When the second baseband processing unit pool has no idle baseband signal, the second baseband processing unit pool is controlled to optically transmit the baseband signal based on the currently used baseband signal.

[0033] Optionally, the first type PON protection device includes: port 1, port 1', port 2 and port 3;

[0034] When the first type PON protection device is deployed at the first remote site, port 1 is connected to the first single-core optical fiber in the direction toward the first aggregation site, and port 1' is connected to the first single-core optical fiber in the direction toward the second aggregation site; port 2 is connected to the second single-core optical fiber in the direction toward the second aggregation site; or, when the first type PON protection device is deployed at the second remote site, port 1 is connected to the second single-core optical fiber in the direction toward the second aggregation site, and port 1' is connected to the second single-core optical fiber in the direction toward the first aggregation site; port 2 is connected to the first single-core optical fiber in the direction toward the first aggregation site;

[0035] Port 3 is connected to a remote unit; the remote unit is a remote unit in a remote site to which the first type PON protection device belongs;

[0036] The first type PON protection device includes: an optical splitter X, an optical splitter Y, an optical power detector, an optical switch controller, a 1*2 optical switch, and an optical network unit (ONU); the optical splitter X and the optical splitter Y are passive components;

[0037] Optical splitter X includes: port 1, port 1' and port 1". The splitting ratio of port 1' is less than or equal to the splitting ratio of port 1'. Port 1' is connected to the uplink port of optical splitter Y.

[0038] The optical splitter Y includes: a first downstream port and a second downstream port; the splitting ratio of the first downstream port is greater than the splitting ratio of the second downstream port; the first downstream port is connected to the first output end of the 1*2 optical switch; the second downstream port is connected to the first end of the optical power detector;

[0039] The second end of the optical power detector is connected to the first end of the optical switch controller;

[0040] The second end of the optical switch controller is connected to the first input end of the 1*2 optical switch;

[0041] The second input terminal of the 1*2 optical switch is connected to the first terminal of the ONU;

[0042] The second output port of the 1*2 optical switch is port 2;

[0043] The second end of the ONU is port 3.

[0044] Optionally, the optical power meter is used for:

[0045] When it is detected that the received optical power is lower than the threshold value, the optical switch controller controls the 1*2 optical switch to disconnect the first downstream port and connect port 2;

[0046] When it is detected that the received optical power is higher than or equal to the threshold value, the optical switch controller controls the 1*2 optical switch to turn on the first downstream port and disconnect port 2.

[0047] Optionally, the second type PON protection device includes: port 1, port 1', port 2, port 2' and port 3;

[0048] When the second type PON protection device is deployed at the first remote site, port 1 is connected to the first single-core optical fiber in the direction toward the first aggregation site, and port 1' is connected to the first single-core optical fiber in the direction toward the second aggregation site; port 2 is connected to the second single-core optical fiber in the direction toward the second aggregation site, and port 2' is connected to the second single-core optical fiber in the direction toward the first aggregation site; or, when the second type PON protection device is deployed at the second remote site, port 1 is connected to the second single-core optical fiber in the direction toward the second aggregation site, and port 1' is connected to the second single-core optical fiber in the direction toward the first aggregation site; port 2 is connected to the first single-core optical fiber in the direction toward the first aggregation site, and port 2' is connected to the first single-core optical fiber in the direction toward the second aggregation site;

[0049] Port 3 is connected to a remote unit; the remote unit is a remote unit in a remote site to which the second type PON protection device belongs;

[0050] The second type of PON protection device includes: optical splitter X, optical splitter Y, optical splitter Z, an optical power detector, an optical switch controller, a 1*2 optical switch and an optical network unit (ONU); optical splitter X, optical splitter Y and optical splitter Z are passive components;

[0051] Optical splitter X includes: port 1, port 1' and port 1". The splitting ratio of port 1' is less than or equal to the splitting ratio of port 1'. Port 1' is connected to the uplink port of optical splitter Y.

[0052] The optical splitter Y includes: a first downstream port and a second downstream port; the splitting ratio of the first downstream port is greater than the splitting ratio of the second downstream port; the first downstream port is connected to the first output end of the 1*2 optical switch; the second downstream port is connected to the first end of the optical power detector;

[0053] The second end of the optical power detector is connected to the first end of the optical switch controller;

[0054] The second end of the optical switch controller is connected to the first input end of the 1*2 optical switch;

[0055] The second input terminal of the 1*2 optical switch is connected to the first terminal of the ONU;

[0056] The second end of the ONU is port 3;

[0057] The optical splitter Z includes: port 2, port 2' and port 0". The splitting ratio of port 0" is less than or equal to the splitting ratio of port 2'. Port 0" is connected to the second output end of the 1*2 optical switch.

[0058] Optionally, the optical power meter is used for:

[0059] When it is detected that the received optical power is lower than the threshold value, the optical switch controller controls the 1*2 optical switch to disconnect the first downstream port and connect port 0".

[0060] When it is detected that the received optical power is higher than or equal to the threshold value, the optical switch controller controls the 1*2 optical switch to turn on the first downstream port and disconnect port 0.

[0061] Optionally, the total optical attenuation from the PON port of the first OLT to the ONU optical port in the PON protection device of the target second remote site is less than the difference between the laser transmission power of the PON port of the first OLT and the optical power receiving sensitivity of the ONU laser in the PON protection device of the target second remote site, and the total optical attenuation from the PON port of the first OLT to the ONU optical port in the PON protection device of the target second remote site is less than the difference between the laser transmission power of the ONU in the PON protection device of the target second remote site and the laser optical power receiving sensitivity of the PON port of the first OLT; the target second remote site is a second remote site adjacent to the second aggregation site;

[0062] The total optical attenuation from the PON port of the second OLT to the ONU optical port in the PON protection device of the target first remote site is less than the difference between the laser transmission power of the PON port of the second OLT and the optical power receiving sensitivity of the ONU laser in the PON protection device of the target first remote site, and the total optical attenuation from the PON port of the second OLT to the ONU optical port in the PON protection device of the target first remote site is less than the difference between the laser transmission power of the ONU in the PON protection device of the target first remote site and the laser optical power receiving sensitivity of the PON port of the second OLT; the target first remote site is the first remote site adjacent to the first aggregation site.

[0063] This application can bring the following beneficial effects:

[0064] From the above, it can be seen that when an optical fiber interruption fault occurs at a certain location (i.e., the optical power is lower than the threshold value), the PON protection device at that location and the subsequent PON protection device can reconnect the remote unit of the remote site from the interface of the original single-core optical fiber to the interface of another single-core optical fiber, and then transmit the signal through the aggregation site corresponding to the other single-core optical fiber, thereby realizing the protection switching of the mobile communication remote unit affected by the optical fiber fault, so that the coverage of the mobile communication signal is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0066] Figure 1 A schematic diagram of the structure of a remote unit protection system provided in this application;

[0067] Figure 2 A schematic structural diagram of a first type of PON protection device provided in this application;

[0068] Figure 3 A schematic structural diagram of a second type of PON protection device provided in this application;

[0069] Figure 4 A schematic structural diagram of another remote unit protection system provided by this application;

[0070] Figure 5 A schematic structural diagram of another remote unit protection system provided by this application;

[0071] Figure 6 A schematic structural diagram of another remote unit protection system provided by this application;

[0072] Figure 7 This is a structural diagram of another remote unit protection system provided by this application. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0074] Currently, in scenarios like high-speed rail, highways, and urban roads, mobile communication processing unit pools typically use chained optical fiber cables to connect to remote base stations for mobile communication signal coverage. Remote base stations in mobile communication often utilize a distributed base station architecture, i.e., a processing unit pool + remote base station network.

[0075] For example, in the fourth generation mobile communication technology (4G) and lower standard networks, a mobile communication baseband unit (BBU) pool + remote radio unit (RRU) networking form is usually adopted.

[0076] In high-standard networks such as the fifth generation mobile communication technology (5G), a networking form of a mobile communication base station controller distributed unit (DU) pool + a remote base station active antenna unit (AAU) is usually adopted.

[0077] The RRU / AAU and BBU / DU pools are usually connected in a star or chain manner using bare optical fiber cables and optical fibers of coarse wavelength division multiplexers (CWDM).

[0078] Expensive bidirectional aggregation protection for dense wavelength division multiplexing (DWDM) and optical transport network (OTN) systems requires a large number of dual-route optical cables in a ring, and can only be aggregated to the BBU / DU pool at the same site.

[0079] Since many remote base stations do not have dual-route optical cables converging to the processing unit pool at the same site, when an optical cable fails, all chain-connected mobile communication remote base stations after the optical cable failure site are often disconnected from the network. Mobile communication operators not only lose business revenue, but more importantly, their corporate reputation is seriously damaged.

[0080] Based on the above technical problems, the present application provides a remote unit protection system, including: a first aggregation site and a second aggregation site; wherein, the first aggregation site is connected to m first remote sites and n second remote sites in a chain manner along the direction from the first aggregation site to the second aggregation site through a first single-core optical fiber; the second aggregation site is connected to n second remote sites and m first remote sites in a chain manner along the direction from the second aggregation site to the first aggregation site through a second single-core optical fiber; the m first remote sites belong to the first aggregation site; the n second remote sites belong to the second aggregation site; m and n are positive integers.

[0081] A passive optical network (PON) protection device and a remote unit are deployed at each of the m first remote sites and the n second remote sites. The PON protection device is configured to control the PON protection device to switch the interface of the single-core optical fiber when detecting that the received optical power is lower than a threshold value, so that the remote unit corresponding to the PON protection device switches to a convergence site for signal transmission.

[0082] From the above, it can be seen that when an optical fiber interruption fault occurs at a certain location (i.e., the optical power is lower than the threshold value), the PON protection device at that location and the subsequent PON protection device can reconnect the remote unit of the remote site from the interface of the original single-core optical fiber to the interface of another single-core optical fiber, and then transmit the signal through the aggregation site corresponding to the other single-core optical fiber, thereby realizing the protection switching of the mobile communication remote unit affected by the optical fiber fault, so that the coverage of the mobile communication signal is not affected.

[0083] Figure 1 A schematic structural diagram of a remote unit protection system provided in an embodiment of the present application is shown.

[0084] like Figure 1 As shown, the remote unit protection system includes: a first aggregation site and a second aggregation site.

[0085] The first aggregation site connects m first remote sites and n second remote sites in a chained manner via a first single-core optical fiber, along the direction from the first aggregation site to the second aggregation site. The second aggregation site connects n second remote sites and m first remote sites in a chained manner via a second single-core optical fiber, along the direction from the second aggregation site to the first aggregation site. The m first remote sites belong to the first aggregation site. The n second remote sites belong to the second aggregation site. m and n are positive integers.

[0086] Optionally, the first single-core optical fiber and the second single-core optical fiber are optical cables, which are laid in a chain between aggregation sites to connect remote sites, with the first single-core optical fiber and the second single-core optical fiber each occupying one core.

[0087] A PON protection device and a remote unit are deployed at each of the m first remote sites and the n second remote sites.

[0088] Optionally, the remote unit may be an RRU or an AAU.

[0089] The PON protection device is used to control the PON protection device to switch the interface of the single-core optical fiber when detecting that the received optical power is lower than the threshold value, so that the remote unit corresponding to the PON protection device switches the aggregation site for signal transmission.

[0090] Specifically, the PON protection device is installed between two aggregation sites via chained optical cables and optical fibers.

[0091] Optionally, the PON protection device includes: a first type PON protection device (also referred to as protection device type I) and a second type PON protection device (also referred to as protection device type II).

[0092] The above-mentioned PON protection device is applicable to PON passive optical networks of any rate and any wavelength.

[0093] Type I PON protection devices are installed at remote sites adjacent to the aggregation site, while Type II PON protection devices are installed at remote sites between two Type I PON protection devices. Port 3 of each remote site's PON protection device (including Type I and Type II) is electrically connected to the RRU / AAU at the site via CPRI / eCPRI. In one implementation, the difference between m and n is less than or equal to 1.

[0094] Specifically, because the lengths of optical fibers between remote sites and aggregation sites, as well as between remote sites, are substantially equal, during normal operation, to ensure load balancing among the remote sites primarily assigned to the aggregation site, the number of remote sites primarily assigned to the chained connection should be close. Therefore, the difference between the number m of remote sites primarily assigned to the first aggregation site and the number n of remote sites primarily assigned to the second aggregation site must be 0 or 1.

[0095] It should be noted that the units or information corresponding to the "primary" aggregation site are the units or information corresponding to the current aggregation site, and the units or information corresponding to the "backup" aggregation site are the units or information corresponding to another aggregation site.

[0096] For example, when the "primary" aggregation site is the first aggregation site, the units or information corresponding to the "primary" aggregation site are the units or information corresponding to the first aggregation site, such as: the first optical line terminal (OLT), the first remote site, the first base station protection controller, the first base station data storage device, the first single-core optical fiber, the first baseband processing unit pool, etc.

[0097] The units or information corresponding to the "backup" aggregation site are the units or information corresponding to the second aggregation site, such as: the second OLT, the second remote site, the second base station protection controller, the second base station data storage, the second single-core optical fiber, the second baseband processing unit pool, etc.

[0098] Correspondingly, when the "primary" aggregation site is the second aggregation site, the various units or information corresponding to the "primary" aggregation site are the various units or information corresponding to the second aggregation site, such as: the second OLT, the second remote site, the second base station protection controller, the second base station data storage device, the second single-core optical fiber, the second baseband processing unit pool, etc.

[0099] The units or information corresponding to the "backup" aggregation site are the units or information corresponding to the first aggregation site, such as: the first OLT, the first remote site, the first base station protection controller, the first base station data storage, the first single-core optical fiber, the first baseband processing unit pool, etc.

[0100] Figure 1 It shows the primary home directions of m first remote sites, the primary home directions of n second remote sites, the backup home directions of n second remote sites, and the backup home directions of m first remote sites.

[0101] A first type PON protection device is deployed at an adjacent first remote site and an adjacent second remote site. The adjacent first remote site is used to represent a first remote site adjacent to a first aggregation site among m first remote sites. The adjacent second remote site is used to represent a second remote site adjacent to a second aggregation site among n second remote sites.

[0102] Second-type PON protection devices are deployed at non-adjacent first remote sites and non-adjacent second remote sites. Non-adjacent first remote sites are used to represent the other first remote sites among the m first remote sites, excluding the adjacent first remote site. Adjacent second remote sites are used to represent the other second remote sites among the n second remote sites, excluding the adjacent second remote site.

[0103] The first aggregation site includes a first OLT. A first end of the first OLT is connected to a first-type PON protection device deployed at an adjacent first remote site via a first single-core optical fiber. The first end of the first OLT is configured to bidirectionally transmit baseband signals to the first-type PON protection device deployed at the adjacent first remote site.

[0104] The second aggregation site includes a second OLT. A first end of the second OLT is connected to a first-type PON protection device deployed at an adjacent second remote site via a second single-core optical fiber. The first end of the second OLT is configured to bidirectionally transmit baseband signals to the first-type PON protection device deployed at the adjacent second remote site.

[0105] Specifically, the first OLT and the second OLT can converge single-core optical fibers of optical cables in multiple directions. The first ends of the first OLT and the second OLT can be connected to the first type PON protection device of the remote site through their corresponding single-core optical fibers to achieve optical transmission of baseband signals.

[0106] Optionally, the optical transmission of the baseband signal may be transmitted via a Common Public Radio Interface (CPRI) or an enhanced Common Public Radio Interface (eCPRI).

[0107] In one achievable manner, the first aggregation site further includes: a first base station protection controller, a first base station data storage, and a first baseband processing unit pool.

[0108] The second end of the first OLT is connected to the first baseband processing unit pool. The second end of the first OLT is used to bidirectionally transmit baseband signals with the first baseband processing unit pool.

[0109] The third terminal of the first OLT is connected to the first base station protection controller. The third terminal of the first OLT is used to send interface switching information to the first base station protection controller. The interface switching information is used to indicate that the PON protection device switches the interface of the single-core optical fiber.

[0110] The first base station protection controller is connected to the first base station data storage. The first base station protection controller is configured to, upon receiving the interface switching information, send activation information to the first base station data storage, so that the first base station data storage activates the service configuration parameters of the remote unit corresponding to the interface switching information, and controls the first baseband processing unit pool to transmit a baseband signal to the remote unit corresponding to the interface switching information.

[0111] The second aggregation site further includes: a second base station protection controller, a second base station data storage, and a second baseband processing unit pool.

[0112] The second end of the second OLT is connected to the second baseband processing unit pool. The second end of the second OLT is used to bidirectionally transmit baseband signals with the second baseband processing unit pool.

[0113] The third terminal of the second OLT is connected to the second base station protection controller. The third terminal of the second OLT is used to send interface switching information to the second base station protection controller.

[0114] The second base station protection controller is connected to the second base station data memory. The second base station protection controller is configured to, upon receiving the interface switching information, send activation information to the second base station data memory, so that the second base station data memory activates the service configuration parameters of the remote unit corresponding to the interface switching information, and controls the second baseband processing unit pool to transmit a baseband signal to the remote unit corresponding to the interface switching information.

[0115] Optionally, the baseband processing unit pool may be a BBU or a DU.

[0116] The BBU pool is a pool of 4G and lower-standard mobile communication baseband processing units, including CPRI electrical interfaces.

[0117] The DU pool is a distributed unit pool for 5G and other high-standard mobile communication base station controllers, including an eCPRI electrical interface.

[0118] Specifically, the second ends of the first OLT and the second OLT may be connected to the BBU / DU pool via their corresponding single-core optical fibers to achieve electrical transmission of baseband signals.

[0119] Optionally, the electrical transmission of the baseband signal may be performed via CPRI or eCPRI.

[0120] The third ends of the above-mentioned first OLT and second OLT can be logically connected to the base station protection controller through their corresponding single-core optical fibers, so as to detect the mobile communication RRU / AAU remote base station that is connected to the spare single-core optical fiber (i.e., another single-core optical fiber) due to a failure of the optical cable fiber, and send the information to the base station protection controller.

[0121] The information sent to the base station protection controller may include a primary identity document (ID) of an optical network unit (ONU) and secondary IDs of each electrical port of the ONU.

[0122] The primary ID of the ONU indicates the remote site where the ONU is located. The secondary IDs of each electrical port of the ONU indicate the baseband signal (CPRI / eCPRI) used by each RRU / AAU at the remote site where the ONU is located.

[0123] In one achievable manner, the first base station protection controller is specifically configured to:

[0124] The first baseband processing unit pool is controlled to optically transmit the baseband signal through the PON port of the first OLT.

[0125] When the optical transmission does not meet the preset capacity condition, the first OLT is controlled to compress the baseband signal according to a preset ratio, and the compressed baseband signal is optically transmitted through the PON port of the first OLT.

[0126] When the first baseband processing unit pool has an idle baseband signal, the first baseband processing unit pool is controlled to optically transmit the baseband signal based on the idle baseband signal.

[0127] When the first baseband processing unit pool has no idle baseband signal, the first baseband processing unit pool is controlled to optically transmit the baseband signal based on the currently used baseband signal.

[0128] In one achievable manner, the second base station protection controller is specifically configured to:

[0129] The second baseband processing unit pool is controlled to optically transmit the baseband signal through the PON port of the second OLT.

[0130] When the optical transmission does not meet the preset capacity condition, the second OLT is controlled to compress the baseband signal according to a preset ratio, and the compressed baseband signal is optically transmitted through the PON port of the second OLT.

[0131] When the second baseband processing unit pool has an idle baseband signal, the second baseband processing unit pool is controlled to optically transmit the baseband signal based on the idle baseband signal.

[0132] When the second baseband processing unit pool has no idle baseband signal, the second baseband processing unit pool is controlled to optically transmit the baseband signal based on the currently used baseband signal.

[0133] Specifically, after receiving the reverse-connected mobile communication RRU / AAU remote base station information sent by its corresponding OLT (i.e., switching the interface of the single-core optical fiber so that the remote unit corresponding to the PON protection device switches the aggregation site for signal transmission), the above-mentioned base station protection controller can activate the service configuration parameters corresponding to the reverse-connected mobile communication RRU / AAU remote base station in the base station data storage device, and at the same time control the BBU / DU pool to provide the required baseband signal (CPRI / eCPRI) to the reverse-connected mobile communication RRU / AAU remote base station, and perform optical transmission in the optical fiber through the PON port of the OLT.

[0134] When the optical transmission capacity is insufficient, the base station protection controller can control the OLT to enable z:1 compression (z is a positive integer greater than or equal to 2, such as 2:1) for the baseband signal (CPRI / eCPRI).

[0135] When the BBU / DU pool has enough idle baseband signals, the required baseband signal occupies the idle baseband signals.

[0136] When the BBU / DU pool does not have enough idle baseband signals, the base station protection controller controls the electrical interface of the OLT to share the required baseband signals with the existing baseband signals.

[0137] The base station data storage device stores all service configuration parameters of the standby mobile communication RRU / AAU remote base station.

[0138] During normal operation, all service configuration parameters of the primary mobile communication RRU / AAU remote base station are activated.

[0139] When an optical fiber failure occurs, the base station protection controller activates the service configuration parameters of the corresponding standby mobile communication RRU / AAU remote base station.

[0140] After the optical fiber fault is repaired, the service configuration parameters of the corresponding standby mobile communication RRU / AAU remote base station are frozen.

[0141] The above-mentioned primary mobile communication RRU / AAU remote base station refers to the remote unit corresponding to the aggregation site to which the current base station data storage device belongs.

[0142] Correspondingly, the standby mobile communication RRU / AAU remote base station refers to a remote unit corresponding to another aggregation site.

[0143] For example, when the base station data storage is the base station data storage of the first aggregation site, the active mobile communication RRU / AAU remote base station is the remote unit of the first remote site, and the standby mobile communication RRU / AAU remote base station is the remote unit of the second remote site.

[0144] When the base station data storage is the base station data storage of the second aggregation site, the active mobile communication RRU / AAU remote base station is the remote unit of the second remote site, and the standby mobile communication RRU / AAU remote base station is the remote unit of the first remote site.

[0145] In one possible implementation, Figure 2 As shown, the first type PON protection device includes: port 1, port 1', port 2 and port 3.

[0146] When the first-type PON protection device is deployed at the first remote site, port 1 is connected to the first single-core optical fiber in the direction toward the first convergence site, and port 1' is connected to the first single-core optical fiber in the direction toward the second convergence site. Port 2 is connected to the second single-core optical fiber in the direction toward the second convergence site. Alternatively, when the first-type PON protection device is deployed at the second remote site, port 1 is connected to the second single-core optical fiber in the direction toward the second convergence site, and port 1' is connected to the second single-core optical fiber in the direction toward the first convergence site. Port 2 is connected to the first single-core optical fiber in the direction toward the first convergence site.

[0147] Port 3 is connected to a remote unit, which is a remote unit in a remote site to which the first type PON protection device belongs.

[0148] The first type PON protection device includes: optical splitter X, optical splitter Y, an optical power detector, an optical switch controller, a 1*2 optical switch, and an ONU. Optical splitter X and optical splitter Y are passive components.

[0149] Specifically, when a power outage occurs at a mobile communication RRU / AAU remote base station at a certain remote site, since the optical splitter X in the PON protection device is a passive component, it does not affect the optical transmission of subsequent mobile communication RRU / AAU remote base stations, that is, the subsequent mobile communication RRU / AAU remote base stations can still operate normally.

[0150] Optical splitter X includes: port 1, port 1' and port 1".

[0151] The splitting ratio of port 1" is less than or equal to the splitting ratio of port 1'. Port 1" is connected to the uplink port of splitter Y.

[0152] The optical splitter Y includes a first downstream port and a second downstream port.

[0153] The first downstream port has a greater splitting ratio than the second downstream port. The first downstream port is connected to the first output end of the 1*2 optical switch. The second downstream port is connected to the first end of the optical power detector.

[0154] The second end of the optical power detector is connected to the first end of the optical switch controller.

[0155] The second end of the optical switch controller is connected to the first input end of the 1*2 optical switch.

[0156] The second input terminal of the 1*2 optical switch (i.e. Figure 2 Port 0 in is connected to the first end of the ONU.

[0157] The second output end of the 1*2 optical switch is port 2.

[0158] The second end of the ONU is port 3.

[0159] Optionally, of the first downstream port and the second downstream port of the optical splitter Y, one may have a splitting ratio of 95%-97%, ie, a downstream port with a high splitting ratio, and the other may have a splitting ratio of 3%-5%, ie, a downstream port with a low splitting ratio.

[0160] The downlink port with a high splitting ratio can be optically connected to the first input end of the 1*2 optical switch, and the other downlink port with a low splitting ratio can be optically connected to the optical power detector.

[0161] One end of the optical power detector is optically connected to the port of the optical splitter Y with a low splitting ratio (3%-5%), and the other end is logically connected to the optical switch controller.

[0162] The optical switch control module has one end connected to the optical power detector logic and the other end connected to the 1*2 optical switch logic.

[0163] One end of the 1*2 optical switch is logically connected to the optical switch control module, port 0 is optically connected to the optical network unit (ONU) of the local site, port 0' is optically connected to the port of splitter y with a higher splitting ratio (95%-97%), and port 0 (i.e., port 2 of the PON protection device) is connected to the single-core optical fiber of the spare optical cable.

[0164] In one practicable manner, the optical power detector is specifically used to:

[0165] When it is detected that the received optical power is lower than the threshold value, the optical switch controller controls the 1*2 optical switch to disconnect the first downstream port ( Figure 2 Port 0' in the circuit is turned on, and port 2 is turned on.

[0166] When it is detected that the received optical power is higher than or equal to the threshold value, the optical switch controller controls the 1*2 optical switch to turn on the first downstream port and disconnect port 2.

[0167] Specifically, during normal operation, port 0 of the 1*2 optical switch is optically connected to port 0'.

[0168] When the main optical cable fails, the optical power received by the optical power detector is less than the threshold value, and the optical switch controller controls port 0 of the optical switch to be optically connected to port 0.

[0169] After the optical cable fiber fault is restored, the optical power received by the optical power detector is greater than the threshold value, and the port 0 of the optical switch is controlled to be optically connected to port 0'.

[0170] In one achievable embodiment, the total optical attenuation from the PON port of the first OLT to the ONU optical port in the PON protection device of the target second remote site is less than the difference between the laser transmit power of the PON port of the first OLT and the optical power receiving sensitivity of the ONU laser in the PON protection device of the target second remote site, and the total optical attenuation from the PON port of the first OLT to the ONU optical port in the PON protection device of the target second remote site is less than the difference between the laser transmit power of the ONU laser in the PON protection device of the target second remote site and the optical power receiving sensitivity of the laser on the PON port of the first OLT. The target second remote site is a second remote site adjacent to the second aggregation site.

[0171] Specifically, the total optical attenuation from the PON port of the aggregation site OLT to the optical port of the optical network unit ONU in the last remote site PON protection device to be protected must be less than the difference between the laser transmission power of the PON port of the aggregation site OLT and the optical power receiving sensitivity of the optical network unit ONU in the last remote site PON protection device to be protected, and at the same time, it must be less than the difference between the laser transmission power of the optical network unit ONU in the last remote site PON protection device to be protected and the laser optical power receiving sensitivity of the PON port of the OLT.

[0172] When the optical transmission capacity cannot meet the needs of remote sites, in addition to the base station protection controller controlling the OLT to enable z:1 compression of baseband signals (CPRI / eCPRI), higher-speed passive optical networks (PONs) can be used, or multiple pairs of color optical channels can be opened in a single fiber of the optical cable, or the number of single-core fibers occupied in the optical cable can be increased to provide for the OLT's newly added PON ports and ONUs.

[0173] In one possible implementation, Figure 3 As shown, the second type PON protection device includes: port 1, port 1', port 2, port 2' and port 3.

[0174] When the second type PON protection device is deployed at the first remote site, port 1 is connected to the first single-core optical fiber in the direction toward the first convergence site, and port 1' is connected to the first single-core optical fiber in the direction toward the second convergence site. Port 2 is connected to the second single-core optical fiber in the direction toward the second convergence site, and port 2' is connected to the second single-core optical fiber in the direction toward the first convergence site. Alternatively, when the second type PON protection device is deployed at the second remote site, port 1 is connected to the second single-core optical fiber in the direction toward the second convergence site, and port 1' is connected to the second single-core optical fiber in the direction toward the first convergence site. Port 2 is connected to the first single-core optical fiber in the direction toward the first convergence site, and port 2' is connected to the first single-core optical fiber in the direction toward the second convergence site.

[0175] Port 3 is connected to a remote unit, which is a remote unit in a remote site to which the second type PON protection device belongs.

[0176] The second type of PON protection device includes: optical splitter X, optical splitter Y, optical splitter Z, an optical power detector, an optical switch controller, a 1*2 optical switch, and an optical network unit (ONU). Optical splitter X, optical splitter Y, and optical splitter Z are passive components.

[0177] Specifically, when a power outage occurs at a mobile communication RRU / AAU remote base station at a certain remote site, since the optical splitter X and the optical splitter Z in the PON protection device are passive components, the optical transmission of the subsequent mobile communication RRU / AAU remote base stations is not affected, that is, the subsequent mobile communication RRU / AAU remote base stations can still operate normally.

[0178] Optical splitter X includes: port 1, port 1', and port 1". The splitting ratio of port 1" is less than or equal to the splitting ratio of port 1'. Port 1" is connected to the uplink port of optical splitter Y.

[0179] Optical splitter Y includes a first downstream port and a second downstream port. The first downstream port has a greater splitting ratio than the second downstream port. The first downstream port is connected to the first output terminal of the 1*2 optical switch. The second downstream port is connected to the first terminal of the optical power detector.

[0180] The second end of the optical power detector is connected to the first end of the optical switch controller.

[0181] The second end of the optical switch controller is connected to the first input end of the 1*2 optical switch.

[0182] The second input end of the 1*2 optical switch is connected to the first end of the ONU.

[0183] The second end of the ONU is port 3.

[0184] The optical splitter Z includes: port 2, port 2' and port 0". The splitting ratio of port 0" is less than or equal to the splitting ratio of port 2'. Port 0" is connected to the second output end of the 1*2 optical switch.

[0185] Specifically, the second type PON protection device has an additional optical splitter Z compared to the first type PON protection device, and the rest of the structure is the same as that of the first type PON protection device.

[0186] Port 2 of the added optical splitter Z is an uplink port, which is connected to the single-core optical fiber of the spare optical cable.

[0187] The splitting ratio of the downstream port 0″ of the optical splitter Z is less than or equal to the splitting ratio of the other downstream port 2′.

[0188] In one practicable manner, the optical power detector is specifically used to:

[0189] When it is detected that the received optical power is lower than the threshold value, the optical switch controller controls the 1*2 optical switch to disconnect the first downstream port and connect port 0.

[0190] When it is detected that the received optical power is higher than or equal to the threshold value, the optical switch controller controls the 1*2 optical switch to turn on the first downstream port and disconnect port 0.

[0191] The total optical attenuation from the PON port of the second OLT to the ONU optical port in the PON protection device of the target first remote site is less than the difference between the laser transmit power of the PON port of the second OLT and the optical power receiving sensitivity of the ONU laser in the PON protection device of the target first remote site, and the total optical attenuation from the PON port of the second OLT to the ONU optical port in the PON protection device of the target first remote site is less than the difference between the laser transmit power of the ONU laser in the PON protection device of the target first remote site and the optical power receiving sensitivity of the laser on the PON port of the second OLT. The target first remote site is the first remote site adjacent to the first aggregation site.

[0192] Specifically, the total optical attenuation from the PON port of the aggregation site OLT to the optical port of the optical network unit ONU in the last remote site PON protection device to be protected must be less than the difference between the laser transmission power of the PON port of the aggregation site OLT and the optical power receiving sensitivity of the optical network unit ONU in the last remote site PON protection device to be protected, and at the same time, it must be less than the difference between the laser transmission power of the optical network unit ONU in the last remote site PON protection device to be protected and the laser optical power receiving sensitivity of the PON port of the OLT.

[0193] When the optical transmission capacity cannot meet the needs of remote sites, in addition to the base station protection controller controlling the OLT to enable z:1 compression of baseband signals (CPRI / eCPRI), higher-speed passive optical networks (PONs) can be used, or multiple pairs of color optical channels can be opened in a single fiber of the optical cable, or the number of single-core fibers occupied in the optical cable can be increased to provide for the OLT's newly added PON ports and ONUs.

[0194] In one possible implementation, Figure 4 As shown, when m + n is greater than or equal to 4, the first aggregation site is preset to be aggregation site A, and the second aggregation site is preset to be aggregation site B. The m first remote sites include: remote site a1, remote site a2, remote site a3, ..., remote site am. The n first remote sites include: remote site b1 ..., remote site bn. The primary single-core optical fiber (also called single-core fiber a) is the first single-core optical fiber, and the backup single-core optical fiber (also called single-core fiber b) is the second single-core optical fiber.

[0195] Figure 4 It shows the primary affiliation direction from remote site a1, remote site a2, and remote site a3 to remote site am, the primary affiliation direction from remote site b1 to remote site bn, the backup affiliation direction from remote site b1 to remote site bn, and the backup affiliation direction from remote site a1, remote site a2, and remote site a3 to remote site am.

[0196] In this case, port 1' of the PON protection device type I (i.e., the first type of PON protection device) at the a1 remote site is optically connected to port 1 of the PON protection device type II (i.e., the second type of PON protection device) at the a2 remote site through the main single-core optical fiber of optical cable a; port 2 of the protection device type I at the a1 remote site is optically connected to port 2' of the PON protection device type II at the a2 remote site through the spare single-core optical fiber of optical cable b; port 1' of the PON protection device type II at the a2 remote site is optically connected to port 1 of the PON protection device type II at the a3 remote site through the main single-core optical fiber of optical cable a, and port 2 of the PON protection device type II at the a2 remote site is optically connected to port 2' of the PON protection device type II at the a3 remote site through the spare single-core optical fiber of optical cable b, and so on until the am remote site.

[0197] The connection method from b1 to the bn remote site is the same as the connection method from a1 to the am remote site, except that the main single-core fiber of the optical cable is b, and the backup single-core fiber of the optical cable is a. Port 1' of the PON protection device II at the am remote site is optically connected to port 2 of the PON protection device II at the bn remote site via single-core fiber of the optical cable a. Port 2 of the PON protection device II at the am remote site is optically connected to port 1' of the PON protection device II at the bn remote site via single-core fiber of the optical cable b.

[0198] In one achievable approach, combining Figure 4 ,like Figure 5 As shown in the figure, when m+n is equal to 3, one of the remote sites a1 is primarily affiliated with the aggregation site A and uses one Type I protection device, and the other two remote sites (b1 and b2) are primarily affiliated with the aggregation site B and use one Type I protection device and one Type II protection device. Port 1' and port 2 of the Type I protection device at the remote site a1 are optically connected to port 2 and port 1' of the Type II protection device at the remote site b2 through single-core optical fibers of optical cables a and b, respectively.

[0199] Figure 5 The diagram shows the primary home direction of the a1 remote station, the primary home directions of the b1 remote station and the b2 remote station, the backup home directions of the b1 remote station and the b2 remote station, and the backup home direction of the a1 remote station.

[0200] In one achievable approach, combining Figure 5 ,like Figure 6 As shown, when m+n is equal to 2, that is, m=n=1, one of the remote sites is mainly assigned to one aggregation site, and the other remote site is mainly assigned to another aggregation site. Only two protection devices I are used. Port 1' and port 2 of one protection device I are optically connected to port 2 and port 1' of the other protection device I through single-core optical fibers of optical cables a and b, respectively.

[0201] Figure 6 The primary home direction of the a1 remote station, the primary home direction of the b1 remote station, the backup home direction of the b1 remote station, and the backup home direction of the a1 remote station are shown.

[0202] Figure 7 A schematic diagram of an application scenario of the remote unit protection system provided in an embodiment of the present application is shown.

[0203] like Figure 7 As shown in the figure, a 4G mobile communication coverage scenario using 10GPON equipment (uplink and downlink bandwidth rates are both 10Gbps) and optical fiber chain with two aggregation sites A and B is preset for high-speed railways or highways. The BBU pool in each aggregation site has 6 pairs of CPRI electrical interfaces (1 pair for transmitting and receiving) connected to the OLT.

[0204] During normal operation, 4 pairs of CPRI are in operation and 2 pairs of CPRI are idle. Among the four remote sites, remote site a1 and remote site a2 belong to aggregation site A as the primary site and aggregation node B as the backup site. Remote site b1 and remote site b2 belong to aggregation site B as the primary site and aggregation node A as the backup site. Each 4G remote base station has 2 RRUs, each RRU occupies 1 pair of CPRI, and the two sectors are back-to-back along the high-speed railway or highway, and each sector is a single carrier frequency.

[0205] Figure 7 The main home directions of remote sites a1 and a2, the main home directions of remote sites b1 and b2, the backup home directions of remote sites b1 and b2, and the backup home directions of remote sites a1 and a2 are shown.

[0206] Table 1 shows the wireless carrier frequency width, antenna conditions, baseband type, and fronthaul baseband bandwidth of the 4G-FDD / LTE mobile communication remote base station RRU.

[0207] Table 1

[0208]

[0209]

[0210] Table 2 shows the bandwidth occupied by the two RRUs at each remote site in 10GPON optical transmission.

[0211] Table 2

[0212]

[0213] like Figure 7 As shown, remote sites a1 and b1 use PON protection device type I, and remote sites a2 and b2 use PON protection device type II.

[0214] Port 1 of the PON protection device type I at the a1 remote site is optically connected to the OLT at the A aggregation site through the main single-core optical fiber of optical cable a, port 1' is optically connected to port 1 of the PON protection device type II at the a2 remote site through the main single-core optical fiber of optical cable a, and port 2 is optically connected to port 2' of the PON protection device type II at the a2 remote site through the spare single-core optical fiber of optical cable b.

[0215] Port 1' of the PON protection device type II at the a2 remote site is optically connected to port 2 of the PON protection device II at the b2 remote site through optical cable a single-core optical fiber, and port 2 of the PON protection device type II at the a2 remote site is optically connected to port 1' of the PON protection device II at the b2 remote site through optical cable b single-core optical fiber.

[0216] The connection method between remote site b1 and remote site b2 is the same as the connection method between remote site a1 and remote site a2, but the main single-core optical fiber of the optical cable is b, and the spare single-core optical fiber of the optical cable is a.

[0217] The total optical attenuation of the optical port of the optical network unit (ONU) in the PON protection device from the PON port of the aggregation site OLT to the last remote site to be protected (from the A aggregation site to the b1 remote site, and from the B aggregation site to the a1 remote site) must be less than the difference between the laser transmission power of the PON port of the aggregation site OLT and the optical power receiving sensitivity of the optical network unit (ONU) in the PON protection device of the last remote site to be protected, and at the same time, less than the difference between the laser transmission power of the optical network unit (ONU) in the PON protection device of the last remote site to be protected and the laser optical power receiving sensitivity of the PON port of the OLT.

[0218] When the optical cable between remote site a1 and remote site a2 fails, the optical power received by the optical power detector in the PON protection device type II of remote site a2 is lower than the threshold value. Then, the optical switch controller controls the optical switch from the original connection to port 0' (main optical cable single-core fiber) to the connection to port 0" (backup optical cable single-core fiber), so that the two RRUs of remote site a2 are assigned to the backup and assigned aggregation site B.

[0219] After the optical cable and fiber fault is repaired, if the optical power received by the optical power detector in the PON protection device type II at the a2 remote site is greater than the threshold value, the optical switch controller controls the optical switch to switch from the port 0 (spare optical cable single-core fiber) to the port 0' (main optical cable single-core fiber), and the a2 remote site returns to the main A aggregation site.

[0220] When an optical cable or fiber fails, the OLT at aggregation site B detects that the two RRUs at remote site a2 have a backup connection failure based on the primary ID of the ONU and the secondary IDs of each ONU electrical port, and sends the information to the base station protection controller at aggregation site B.

[0221] After receiving the reverse-connected mobile communication RRU remote base station information sent by the OLT, the base station protection controller activates the service configuration parameters corresponding to the reverse-connected mobile communication RRU remote base station in the base station data memory.

[0222] Among them, the service configuration parameters include at least IP address, antenna parameters, ONU master ID, ONU electrical port slave ID, Cell ID (base station ID), Sector ID (sector ID), physical cell identifier (Physical Cell Identifier, PCI), frequency, Radius (coverage radius), TAC (tracking area identifier), TAL (location area identifier), uplink / downlink bandwidth, etc.

[0223] The base station protection controller can control the BBU pool to provide two pairs of idle baseband signals (CPRI), which are optically transmitted to the a2 remote site through the optical cable fiber of the OLT's PON port and provided to the two RRU remote base stations where mobile communication reverse connection occurs, ensuring the normal operation of the a2 remote site.

[0224] After the optical cable and optical fiber fault is repaired, the service configuration parameters of the mobile communication RRU remote base station of the corresponding standby a2 remote site are frozen at the B aggregation site.

[0225] When the optical fiber between the a1 remote site and the A aggregation site fails, the optical power received by the optical power detector in the type I PON protection device of the a1 remote site is lower than the threshold value, and the optical switch controller controls the optical switch to be connected from the original port 0' (main optical cable single-core fiber) to the port 0" (backup optical cable single-core fiber). At the same time, when the optical power received by the optical power detector in the type II PON protection device of the a2 remote site is lower than the threshold value, the optical switch controller controls the optical switch to be connected from the original port 0' (main optical cable single-core fiber) to the port 0" (backup optical cable single-core fiber). As a result, the two RRUs of the a1 remote site and the a2 remote site belong to the backup and belong to the B aggregation site.

[0226] After the optical cable and fiber fault is repaired, if the optical power received by the optical power detector in the PON protection device of remote site a1 and remote site a2 is greater than the threshold value, the optical switch controller controls the optical switch to switch from the connection at port 0 (single-core fiber of the backup optical cable) back to port 0' (single-core fiber of the main optical cable), and remote site a1 and remote site a2 return to the main aggregation site A.

[0227] The OLT optical line terminal at aggregation site B detects that a backup connection has occurred in the two RRUs at remote sites a1 and a2 based on the primary ID of the ONU and the secondary IDs of the electrical ports of the ONU, and sends the information to the base station protection controller at aggregation site B.

[0228] After receiving the reverse-connected mobile communication RRU remote base station information sent by the OLT, the base station protection controller activates the service configuration parameters corresponding to the reverse-connected mobile communication RRU remote base station in the base station data memory.

[0229] The service configuration parameters include at least the IP address, antenna parameters, the main ID of the ONU, the slave IDs of each electrical port of the ONU, the Cell ID, Sector ID, PCI, frequency, Radius, TAC, TAL, uplink / downlink bandwidth, etc.

[0230] The base station protection controller can control the BBU pool to provide two pairs of idle baseband signals (CPRI). By controlling the electrical interface of the OLT, the base station protection controller allows the required baseband signals to share the existing baseband signals. That is, the two RRUs at the a1 remote site share one pair of CPRI, and the two RRUs at the a2 remote site share another pair of CPRI. The base station protection controller transmits the CPRI signals to the a1 remote site and the a2 remote site through the optical cable through the PON port of the OLT. The signals are provided to the two mobile communication RRU remote base stations at the a1 remote site and the a2 remote site that have been reversed, thus ensuring the normal operation of the a1 remote site and the a2 remote site.

[0231] After the optical cable and optical fiber fault is repaired, the service configuration parameters of the mobile communication RRU remote base stations of the corresponding standby remote sites a1 and a2 are frozen at the B aggregation site.

[0232] When an optical fiber failure occurs between the b2 remote site and the b1 remote site, or between the b1 remote site and the B aggregation site, the protection works in the same way and will not be described in detail.

[0233] When the capacity of 10GPON optical transmission still cannot meet the needs of remote sites through the above methods, for example, if there are large capacity requirements such as RRU / AAU at multiple remote sites, a higher-speed passive optical network PON (such as 25GPON, 50GPON, 100GPON, etc.) can be used, or multiple pairs of color optical channels can be opened in a single-core optical fiber of the optical cable to adopt WDM-PON, or the number of single-core optical fibers occupied in the optical cable can be increased to provide for the new PON ports and ONUs of the OLT.

[0234] Optionally, when the mobile communication RRU / AAU remote base station at the a1 remote site is powered off, since the optical splitter X in the PON protection device is a passive component, it does not affect the optical transmission of the subsequent mobile communication RRU / AAU remote base station at the a2 remote site, that is, the subsequent mobile communication RRU / AAU remote base station at the a2 remote site can still operate normally.

[0235] Similarly, when the mobile communication RRU / AAU remote base station at the b1 remote site is powered off, the normal operation of the subsequent mobile communication RRU / AAU remote base station at the b2 remote site will not be affected.

[0236] From the above, it can be seen that the PON protection device and system of the RRU / AAU remote base station unit provided in this application are suitable for the BBU / DU pool aggregation site of mobile communications at both ends. Different single-core optical fibers in the optical cable can be used to chain the mobile communication RRU / AAU remote base stations to which they belong, and optical transmission of baseband signals (CPRI / eCPRI) can be performed in a PON manner.

[0237] The base station data memory at the mobile communication BBU / DU pool aggregation site stores all service configuration parameters for the primary and backup mobile communication RRU / AAU remote base stations. During normal operation, the mobile communication BBU / DU pool aggregation site is responsible for communicating with the primary mobile communication RRU / AAU remote base station.

[0238] When an optical fiber interruption occurs at a certain location, the PON protection device at that location and the subsequent ones will connect the original connection of the mobile communication RRU / AAU remote base station at the remote site to the main single-core optical fiber and then reverse the connection to the backup single-core optical fiber. The OLT at the BBU / DU pool aggregation site of the backup direction mobile communication can then find out which mobile communication RRU / AAU remote base stations have been reversed, and activate the data of the remote base stations that have been reversed in the base station data storage device that needs to be protected through the base station protection controller, so that the BBU and DU pools enable the CPRI / eCPRI of the remote base stations that have been reversed, thereby realizing the protection switching of the mobile communication RRU / AAU remote base stations affected by the optical fiber failure, so that the coverage of the mobile communication signal is not affected.

[0239] In addition, when a power outage occurs at a mobile communication RRU / AAU remote base station at a certain remote site, since the splitter X in the first type PON protection device and the splitters X and Z in the second type PON protection device are passive components, the optical transmission of subsequent mobile communication RRU / AAU remote base stations is not affected, that is, the subsequent mobile communication RRU / AAU remote base stations can still operate normally.

[0240] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0241] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer execution instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more media that can be integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0242] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0243] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0244] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0245] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection set forth in the claims.

Claims

1. A remote unit protection system, characterized in that: include: a first aggregation site and a second aggregation site; The first aggregation site is connected to m first remote sites and n second remote sites in a chain manner through a first single-core optical fiber along the direction from the first aggregation site to the second aggregation site; the second aggregation site is connected to the n second remote sites and the m first remote sites in a chain manner through a second single-core optical fiber along the direction from the second aggregation site to the first aggregation site; the m first remote sites belong to the first aggregation site; the n second remote sites belong to the second aggregation site; m and n are positive integers; A passive optical network (PON) protection device and a remote unit are deployed on each of the m first remote sites and the n second remote sites; The PON protection device is used to control the PON protection device to switch the interface of the single-core optical fiber when detecting that the received optical power is lower than the threshold value, so that the remote unit corresponding to the PON protection device switches the aggregation site for signal transmission; The first aggregation site includes: a first optical line terminal OLT, a first base station protection controller, a first base station data storage and a first baseband processing unit pool; The second end of the first OLT is connected to the first baseband processing unit pool; the second end of the first OLT is used to bidirectionally transmit baseband signals with the first baseband processing unit pool; The third end of the first OLT is connected to the first base station protection controller; the third end of the first OLT is used to send interface switching information to the first base station protection controller; the interface switching information is used to indicate that the PON protection device switches the interface of the single-core optical fiber; The first base station protection controller is connected to the first base station data storage; the first base station protection controller is configured to, after receiving the interface switching information, send activation information to the first base station data storage, so that the first base station data storage activates the service configuration parameters of the remote unit corresponding to the interface switching information, and controls the first baseband processing unit pool to transmit a baseband signal to the remote unit corresponding to the interface switching information; The second aggregation site includes: a second OLT, a second base station protection controller, a second base station data storage, and a second baseband processing unit pool; The second end of the second OLT is connected to the second baseband processing unit pool; the second end of the second OLT is used to bidirectionally transmit baseband signals with the second baseband processing unit pool; The third end of the second OLT is connected to the second base station protection controller; the third end of the second OLT is used to send interface switching information to the second base station protection controller; The second base station protection controller is connected to the second base station data memory; the second base station protection controller is configured to, after receiving the interface switching information, send activation information to the second base station data memory, so that the second base station data memory activates the service configuration parameters of the remote unit corresponding to the interface switching information, and controls the second baseband processing unit pool to transmit a baseband signal to the remote unit corresponding to the interface switching information; The first base station protection controller is specifically configured to: Controlling the first baseband processing unit pool to optically transmit the baseband signal through a PON port of the first OLT; When the optical transmission does not meet a preset capacity condition, controlling the first OLT to compress the baseband signal according to a preset ratio, and optically transmitting the compressed baseband signal through the PON port of the first OLT; When the first baseband processing unit pool has an idle baseband signal, controlling the first baseband processing unit pool to optically transmit the baseband signal based on the idle baseband signal; When the first baseband processing unit pool has no idle baseband signal, controlling the first baseband processing unit pool to optically transmit the baseband signal based on the currently used baseband signal; The second base station protection controller is specifically configured to: Controlling the second baseband processing unit pool to optically transmit the baseband signal through a PON port of the second OLT; When the optical transmission does not meet the preset capacity condition, controlling the second OLT to compress the baseband signal according to a preset ratio, and optically transmitting the compressed baseband signal through the PON port of the second OLT; When the second baseband processing unit pool has an idle baseband signal, controlling the second baseband processing unit pool to optically transmit the baseband signal based on the idle baseband signal; When the second baseband processing unit pool has no idle baseband signal, the second baseband processing unit pool is controlled to optically transmit the baseband signal based on the currently used baseband signal.

2. The remote unit protection system according to claim 1, wherein: The difference between m and n is less than or equal to 1; A first type PON protection device is deployed on an adjacent first remote site and an adjacent second remote site; the adjacent first remote site is used to represent a first remote site adjacent to the first aggregation site among the m first remote sites; the adjacent second remote site is used to represent a second remote site adjacent to the second aggregation site among the n second remote sites; A second type of PON protection device is deployed on a non-adjacent first remote site and a non-adjacent second remote site; the non-adjacent first remote site is used to represent other first remote sites among the m first remote sites, excluding the adjacent first remote site; the adjacent second remote site is used to represent other second remote sites among the n second remote sites, excluding the adjacent second remote site; The first end of the first OLT is connected to the first type PON protection device deployed at the adjacent first remote site through the first single-core optical fiber; the first end of the first OLT is used to bidirectionally transmit baseband signals with the first type PON protection device deployed at the adjacent first remote site; The first end of the second OLT is connected to the first type PON protection device deployed on the adjacent second remote site through the second single-core optical fiber; the first end of the second OLT is used to bidirectionally transmit baseband signals with the first type PON protection device deployed on the adjacent second remote site.

3. The remote unit protection system according to claim 2, wherein: The first type PON protection device includes: port 1, port 1', port 2 and port 3; When the first type PON protection device is deployed at the first remote site, the port 1 is connected to the first single-core optical fiber in the direction toward the first aggregation site, and the port 1' is connected to the first single-core optical fiber in the direction toward the second aggregation site; the port 2 is connected to the second single-core optical fiber in the direction toward the second aggregation site; or, when the first type PON protection device is deployed at the second remote site, the port 1 is connected to the second single-core optical fiber in the direction toward the second aggregation site, and the port 1' is connected to the second single-core optical fiber in the direction toward the first aggregation site; the port 2 is connected to the first single-core optical fiber in the direction toward the first aggregation site; The port 3 is connected to a remote unit; the remote unit is a remote unit in a remote site to which the first type PON protection device belongs; The first type PON protection device includes: an optical splitter X, an optical splitter Y, an optical power detector, an optical switch controller, a 1*2 optical switch and an optical network unit ONU; the optical splitter X and the optical splitter Y are passive components; The optical splitter X includes: the port 1, the port 1' and the port 1", the splitting ratio of the port 1" is less than or equal to the splitting ratio of the port 1'; the port 1" is connected to the uplink port of the optical splitter Y; The optical splitter Y includes: a first downstream port and a second downstream port; the splitting ratio of the first downstream port is greater than the splitting ratio of the second downstream port; the first downstream port is connected to the first output end of the 1*2 optical switch; the second downstream port is connected to the first end of the optical power detector; The second end of the optical power detector is connected to the first end of the optical switch controller; The second end of the optical switch controller is connected to the first input end of the 1*2 optical switch; The second input end of the 1*2 optical switch is connected to the first end of the ONU; The second output end of the 1*2 optical switch is the port 2; The second end of the ONU is the port 3.

4. The remote unit protection system according to claim 3, wherein: The optical power detector is specifically used for: When it is detected that the received optical power is lower than the threshold value, the optical switch controller controls the 1*2 optical switch to disconnect the first downstream port and connect the port 2; When it is detected that the received optical power is higher than or equal to the threshold value, the optical switch controller controls the 1*2 optical switch to turn on the first downstream port and disconnect the port 2.

5. The remote unit protection system according to claim 2, wherein: The second type PON protection device includes: port 1, port 1', port 2, port 2' and port 3; When the second type PON protection device is deployed at the first remote site, the port 1 is connected to the first single-core optical fiber in the direction toward the first aggregation site, and the port 1' is connected to the first single-core optical fiber in the direction toward the second aggregation site; the port 2 is connected to the second single-core optical fiber in the direction toward the second aggregation site, and the port 2' is connected to the second single-core optical fiber in the direction toward the first aggregation site; or, when the second type PON protection device is deployed at the second remote site, the port 1 is connected to the second single-core optical fiber in the direction toward the second aggregation site, and the port 1' is connected to the second single-core optical fiber in the direction toward the first aggregation site; the port 2 is connected to the first single-core optical fiber in the direction toward the first aggregation site, and the port 2' is connected to the first single-core optical fiber in the direction toward the second aggregation site; The port 3 is connected to a remote unit; the remote unit is a remote unit in a remote site to which the second type PON protection device belongs; The second type PON protection device includes: an optical splitter X, an optical splitter Y, an optical splitter Z, an optical power detector, an optical switch controller, a 1*2 optical switch and an optical network unit ONU; the optical splitter X, the optical splitter Y and the optical splitter Z are passive components; The optical splitter X includes: the port 1, the port 1' and the port 1", the splitting ratio of the port 1" is less than or equal to the splitting ratio of the port 1'; the port 1" is connected to the uplink port of the optical splitter Y; The optical splitter Y includes: a first downstream port and a second downstream port; the splitting ratio of the first downstream port is greater than the splitting ratio of the second downstream port; the first downstream port is connected to the first output end of the 1*2 optical switch; the second downstream port is connected to the first end of the optical power detector; The second end of the optical power detector is connected to the first end of the optical switch controller; The second end of the optical switch controller is connected to the first input end of the 1*2 optical switch; The second input end of the 1*2 optical switch is connected to the first end of the ONU; The second end of the ONU is the port 3; The optical splitter Z includes: the port 2, the port 2' and the port 0". The splitting ratio of the port 0" is less than or equal to the splitting ratio of the port 2'. The port 0" is connected to the second output end of the 1*2 optical switch.

6. The remote unit protection system according to claim 5, wherein: The optical power detector is specifically used for: When it is detected that the received optical power is lower than the threshold value, the optical switch controller controls the 1*2 optical switch to disconnect the first downstream port and connect the port 0". When it is detected that the received optical power is higher than or equal to the threshold value, the optical switch controller controls the 1*2 optical switch to turn on the first downstream port and disconnect the port 0".

7. The remote unit protection system according to claim 3 or 5, characterized in that: The total optical attenuation from the PON port of the first OLT to the ONU optical port in the PON protection device of the target second remote site is less than the difference between the laser transmit power of the PON port of the first OLT and the optical power receiving sensitivity of the ONU laser in the PON protection device of the target second remote site, and the total optical attenuation from the PON port of the first OLT to the ONU optical port in the PON protection device of the target second remote site is less than the difference between the laser transmit power of the ONU laser in the PON protection device of the target second remote site and the optical power receiving sensitivity of the laser of the PON port of the first OLT; The target second remote site is a second remote site adjacent to the second aggregation site; The total optical attenuation from the PON port of the second OLT to the ONU optical port in the PON protection device of the target first remote site is less than the difference between the laser transmit power of the PON port of the second OLT and the optical power receiving sensitivity of the ONU laser in the PON protection device of the target first remote site, and the total optical attenuation from the PON port of the second OLT to the ONU optical port in the PON protection device of the target first remote site is less than the difference between the laser transmit power of the ONU laser in the PON protection device of the target first remote site and the optical power receiving sensitivity of the laser of the PON port of the second OLT; The target first remote site is a first remote site adjacent to the first aggregation site.

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