Wireless base station indoor coverage system and method based on FTTR network

Abstract

The present application discloses a wireless base station indoor coverage system and method based on FTTR network, including: a main optical splitter, connected to OLT and multi-user network; a wireless access module, deployed outside the multi-user network or in the main device; the main device, including the main optical modem, the radio frequency module and the first combiner / demultiplexer, the first combiner / demultiplexer combines the first downstream optical signal with the second downstream optical signal of the main optical modem and sends it to the slave optical splitter, and separates the combined upstream optical signal of the slave optical splitter into signals sent to the wireless access module and the main optical modem; the slave optical splitter, connected to the first combiner / demultiplexer and the second combiner / demultiplexer; the slave device, including the slave optical modem, the slave RRU and the second combiner / demultiplexer, the second combiner / demultiplexer separates the combined downstream optical signal into signals sent to the slave RRU and the slave optical modem, and combines the first upstream optical signal from the RRU and the second upstream optical signal from the optical modem and sends them to the slave optical splitter. This is to solve the problem that the wireless fronthaul network of the existing wireless coverage solution is complex and needs to be deployed separately.

Description

Technical Field

[0001] The present application relates to the field of wireless network technology, and in particular to a wireless base station indoor coverage system and method based on a FTTR network. Background Art

[0002] In cellular wireless network architectures, there are usually many obstacles in indoor scenes, such as walls and furniture, which weaken the wireless signal and cause the signal quality to deteriorate. Achieving deep coverage in indoor scenes with complex patterns can ensure that high-quality signals can be received even deep indoors. When users use mobile devices indoors, deep coverage can provide more stable and faster network connections and better call quality, improving the user experience.

[0003] Existing technologies for achieving deep coverage in indoor scenes with complex layouts include: home-level base stations, distributed pico base stations, and extended pico base stations.

[0004] Home-grade base stations complete the functions of base station BBU (Building Base band Unite, indoor baseband processing unit) and RRU (Radio Remote Unit, wireless remote unit), and are easy to deploy. However, due to the small coverage range of base stations, the large number of deployments, and the numerous neighboring relationships with macro base stations, the management workload is large and the wireless network is complex. In the scenario of different rooms in the same user's residence, the coverage capacity of a single home-grade base station is insufficient, and the deployment of multiple base stations will also cause network optimization problems such as co-frequency interference.

[0005] Distributed pico base stations and extended pico base stations are generally used in enterprises or commercial buildings. Their topology is as follows: Figure 1 As shown in the figure, the BBU and expansion unit are deployed in the building room, and the RRU is deployed in the corridor or room of the coverage area. Generally, the power of the RRU is from tens of MW to hundreds of MW, which can cover a room or adjacent rooms. In this solution, the BBU / extension unit and RRU need to be connected by direct network cable or direct optical fiber, and the fronthaul network needs to be deployed separately, which is difficult and costly to construct. Summary of the invention

[0006] The purpose of this application is to provide a wireless base station indoor coverage system and method based on FTTR network, which is used to solve the problems of complex wireless fronthaul network, separate deployment and high construction difficulty of existing home-level base stations, distributed pico base stations and extended pico base stations.

[0007] In a first aspect, an embodiment of the present application provides a wireless base station indoor coverage system based on an FTTR network, comprising:

[0008] The master optical splitter is connected to the OLT and a multi-user network, each of which includes a master device, a slave optical splitter and multiple slave devices;

[0009] A wireless access module, used for accessing a core network, deployed outside the multi-user network, or deployed in a main device of each user network;

[0010] The master device includes a master optical modem, a radio frequency module and a first combiner / demultiplexer, wherein the first combiner / demultiplexer is used to combine a first downlink optical signal with a second downlink optical signal of the master optical modem and send the combined uplink optical signal to a slave optical splitter, and separate the combined uplink optical signal sent by the slave optical splitter into a first uplink optical signal and send it to a wireless access module, and separate it into a second uplink optical signal and send it to the master optical modem, wherein the first downlink optical signal is an optical signal corresponding to a downlink wireless signal from the wireless access module, and the radio frequency module is used to provide wireless coverage for the master device;

[0011] The slave optical splitter is used to split the combined downlink optical signal into multiple channels for transmission to the corresponding slave devices, and to send the combined uplink optical signal sent by the second combiner / demultiplexer of each slave device to the first combiner / demultiplexer;

[0012] The slave device includes a slave optical modem, a slave wireless remote unit RRU and a second combiner / splitter, wherein the second combiner / splitter is used to separate the combined downlink optical signal into a first downlink optical signal and send it to the slave RRU, and separate it into a second downlink optical signal and send it to the slave optical modem, and combine the first uplink optical signal sent by the slave RRU and the second uplink optical signal sent by the optical modem and send them to the slave optical splitter.

[0013] In some possible embodiments, the wireless access module includes a BBU, the wireless access module is deployed outside the multi-user network, the system further includes a third combiner / demultiplexer and a fourth combiner / demultiplexer, the radio frequency module is a main RRU with an XGSPON optical module, wherein:

[0014] A third combiner / splitter, used for combining the first downstream optical signal sent by the BBU and the fourth downstream optical signal sent by the OLT and sending the combined upstream optical signal received from the main optical splitter into a first upstream optical signal and sending it to the BBU, and into a fourth upstream optical signal and sending it to the OLT;

[0015] The fourth combiner / splitter is used to separate the combined downlink optical signal sent by the main splitter into a first downlink optical signal and send it to the main RRU, separate it into a fourth downlink optical signal and send it to the main optical modem, and copy the first downlink optical signal and send it to the first combiner / splitter; and combine the first uplink optical signal sent by the main RRU, the first uplink optical signal sent by the slave RRU and the fourth uplink optical signal sent by the main optical modem and send them to the main splitter.

[0016] In some possible embodiments, the system includes a first-level point-to-multipoint P2MP topology architecture, wherein:

[0017] The BBU is a master node, and the master RRU and the slave RRU are slave nodes;

[0018] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0019] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0020] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0021] In some possible embodiments, the wireless access module includes a BBU, the wireless access module is deployed outside the multi-user network, the system further includes a third combiner / demultiplexer and a fourth combiner / demultiplexer, the radio frequency module is a main RRU with an XGSPON ONU optical module and an XGSPON OLT optical module, wherein:

[0022] A third combiner / splitter, used for combining the third downstream optical signal sent by the BBU and the fourth downstream optical signal sent by the OLT and sending the combined upstream optical signal received from the main optical splitter into a third upstream optical signal and sending it to the BBU, and into a fourth upstream optical signal and sending it to the OLT;

[0023] A fourth combiner / splitter, used to separate the combined downlink optical signal sent by the main optical splitter into a third downlink optical signal and send it to the main RRU, and separate it into a fourth downlink optical signal and send it to the main optical modem; and combine the third uplink optical signal sent by the main RRU and the fourth uplink optical signal of the main optical modem and send them to the main optical splitter;

[0024] The first combiner / demultiplexer is connected to the XGSPON OLT optical module of the master RRU to send the separated first uplink optical signal to the master RRU;

[0025] The master RRU sends the first downlink optical signal to the first combiner / demultiplexer, and is further configured to combine and process the first uplink optical signal sent by the slave RRU and sent by the first combiner / demultiplexer to obtain a third uplink optical signal.

[0026] In some possible embodiments, the system includes a two-level P2MP topology architecture, wherein:

[0027] In the first-level P2MP topology, the BBU is the master node and each master RRU is a slave node. In the second-level P2MP topology, the master RRU is the master node and each slave RRU is a slave node.

[0028] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0029] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0030] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0031] In some possible embodiments, the wireless access module is combined with the radio frequency module, and a small base station with a fronthaul function is used. The small base station includes an XGSPON OLT optical module. The wireless access module is deployed in the main device of each user network, and the local LAN of the main optical modem in the main device is used to access the core network.

[0032] The small base station is connected to the local LAN via a backhaul interface and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module;

[0033] The small base station sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU and sent by the first combiner / demultiplexer.

[0034] In some possible embodiments, the system includes a one-level P2MP topology architecture, wherein:

[0035] The small base station is a master node, and the slave RRU is a slave node;

[0036] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0037] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0038] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0039] In some possible embodiments, the wireless access module is a macro base station deployed outside the multi-user network, the radio frequency module is a repeater with a fronthaul function, and the repeater includes an XGSPON OLT optical module, wherein:

[0040] The repeater is connected to the macro base station through an upper-level RF interface, and is connected to the first combiner / demultiplexer through an XGSPON OLT optical module, sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU by the first combiner / demultiplexer.

[0041] In some possible embodiments, the system includes a one-level P2MP topology architecture, wherein:

[0042] The repeater is a master node, and the slave RRU is a slave node;

[0043] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0044] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0045] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0046] In a second aspect, an embodiment of the present application provides a method for indoor coverage of a wireless base station based on an FTTR network based on the above system, including:

[0047] Providing wireless coverage of the master device through a radio frequency module of the master device;

[0048] In the downstream direction, the first downstream optical signal is combined with the second downstream optical signal of the master optical modem by the first combiner / demultiplexer and then sent to the slave optical splitter, and the slave optical splitter splits the combined downstream optical signal into multiple channels for transmission to the corresponding slave device, and the second combiner / demultiplexer of the slave device separates the combined downstream optical signal into the first downstream optical signal and sends it to the slave RRU, and separates it into the second downstream optical signal and sends it to the slave optical modem;

[0049] In the uplink direction, the first uplink optical signal sent from the RRU and the second uplink optical signal sent from the optical modem are combined by the second combiner / splitter of the slave device and sent to the slave optical splitter, and the slave optical splitter sends the combined uplink optical signal to the first combiner / splitter of the master device, and the first combiner / splitter separates the combined uplink optical signal into a first uplink optical signal and sends it to the wireless access module, and separates it into a second uplink optical signal and sends it to the master optical modem.

[0050] In some possible embodiments, the system includes at least one level of point-to-multipoint P2MP topology architecture, each level of the P2MP topology architecture includes a master node and a slave node, and further includes:

[0051] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0052] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0053] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0054] In some possible embodiments, the master node dynamically determines the time slot occupancy information through interaction between the master node and the slave node, including:

[0055] After the master node configures the P2MP frame, it broadcasts the time slot resource allocation information to all slave nodes;

[0056] After being powered on, any slave node listens to the broadcasted time slot resource allocation information, selects an initial access time slot, and initiates an access request in the initial access time slot;

[0057] The master node allocates the initial access time slot to the slave node for occupation according to the access request of the slave node, and broadcasts updated time slot resource allocation information;

[0058] The slave node determines to occupy the initial access time slot according to the updated time slot resource allocation information.

[0059] In some possible embodiments, the master node configures the P2MP frame, including:

[0060] Calculate the number of RRUs based on cell parameters and fronthaul requirements;

[0061] The P2MP frame is configured according to the number of RRUs, including configuring the number and position of uplink time slots, the number and position of downlink time slots, the time slot length, and the frame interval.

[0062] The wireless base station indoor coverage system and method based on the FTTR network provided in the embodiment of the present application fully reuses the existing FTTR broadband network, realizes the synchronous deployment of optical modems and RRUs, enables LTE or 5GNR signals and wifi to synchronously cover each room, and realizes deep coverage of indoor scenes with complex patterns, which can greatly reduce the construction difficulty and deployment cost compared with the existing technology. In this way, the existing wireless fronthaul network of home-level base stations, distributed pico base stations, and extended pico base stations is solved, and the problems of complex wireless fronthaul networks, separate deployment and high construction difficulty are solved.

[0063] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings introduced 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 creative work.

[0065] Figure 1 This is a diagram of the architecture of a distributed pico base station in the related technology;

[0066] Figure 2 It is a schematic diagram of FTTR networking in related technologies;

[0067] Figure 3 It is a schematic diagram of FTTR network data transmission in the related technology;

[0068] Figure 4 A schematic diagram of a wireless base station indoor coverage system based on a FTTR network according to an embodiment of the present application;

[0069] Figure 5 A schematic diagram of a system architecture corresponding to a direct wavelength division solution according to an embodiment of the present application;

[0070] Figure 6 A schematic diagram of a process of allocating time slot resources by a master node according to an embodiment of the present application;

[0071] Figure 7 A schematic diagram of a system architecture corresponding to a cascade solution according to an embodiment of the present application;

[0072] Figure 8 A schematic diagram of a system architecture corresponding to an independent small base station solution according to an embodiment of the present application;

[0073] Fig. 9 A schematic diagram of a system architecture corresponding to a wireless signal feeding solution according to an embodiment of the present application;

[0074] Fig.10 The present invention is a flow chart of a method for indoor coverage of a wireless base station based on an FTTR network according to an embodiment of the present application. DETAILED DESCRIPTION

[0075] To further illustrate the technical solution provided by the embodiment of the present application, this is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiment of the present application provides the method operation steps as shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided by the embodiment of the present application. The method can be executed in the order of the method shown in the embodiment or drawings or in parallel during the actual processing process or when the control device is executed.

[0076] When users use mobile devices indoors, deep coverage can provide more stable and faster network connections and better call quality, improving the user experience. It is also important in some special scenarios:

[0077] Support high-density user access: In crowded indoor places such as shopping malls, office buildings, and airports, deep coverage can support more users to access the network at the same time, avoiding network congestion caused by too many users;

[0078] Promote the development of IoT: Deep indoor coverage helps the deployment and operation of IoT devices, as many smart devices require a stable network connection to perform tasks.

[0079] Support emergency communications: In emergency situations, such as fire or earthquake, deep indoor coverage can ensure the continuity of critical communications and help rescue workers respond in a timely manner;

[0080] Improve data transmission capacity: With the increase of data-intensive applications, such as high-definition video streaming and online games, deep coverage can provide sufficient bandwidth to support the smooth operation of these applications.

[0081] Home base stations are generally used in signal coverage blind spots of LTE (Long Term Evolution) or the fifth generation of new wireless 5GNR. They are deployed in the coverage area of ​​the user's home, responsible for wireless signal access, and use home broadband for backhaul to connect to the core network. However, the management workload of home base stations is large and the wireless network is complex. Distributed pico base stations and extended base stations have the problem of requiring separate deployment of fronthaul networks, which are difficult and costly to construct.

[0082] In view of this, the present application provides a wireless base station indoor coverage system and method based on the FTTR network. By reusing the existing FTTR (Fiber to The Room) broadband network, the optical modem and RRU are deployed synchronously, so that LTE or 5GNR signals and home broadband can synchronously cover each room, achieving deep coverage of indoor scenes with complex patterns. Compared with the existing technology, the construction difficulty and deployment cost can be greatly reduced.

[0083] like Figure 2 The figure shows the networking diagram of the FTTR broadband network. In the upstream direction, the master optical modem connects to the OLT and accesses the Internet through access technologies such as XGPON optical modules. In the downstream direction, the master optical modem is equivalent to a mini OLT, and the optical module configured is the Class B+ optical module commonly used by GPON; the slave optical modem is the WiFi 6 Gigabit optical modem currently used by GPON. A 1:5 optical splitter is used in the ODN (Optical Distribution Network) between the master and slave optical modems. The splitter can be cascaded in multiple levels and supports the access of up to 16 slave optical modems.

[0084] like Figure 3The figure shows an implementation block diagram of an FTTR master optical modem. In the downstream direction, the Ethernet subsystem receives data from the XGPON (10 Gigabit-capable Passive Optical Network) ONU (Optical Network Unit) chip of the master optical modem, and performs framing and serial-to-parallel conversion through the downlink data path unit and the burst mode serial transceiver unit, performs electro-optical conversion through the GPON (Gigabit-capable PassiveOptical Network) OLT (Optical Line Termina) module, connects to the internal optical splitter, and further connects to the slave optical modem. In the upstream direction, the data from the optical modem is processed by burst transmission, serial-to-parallel conversion, deframing, etc., and is transmitted to the XGPON ONU chip through the Ethernet subsystem unit, and then framed and transmitted upstream.

[0085] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0086] The wireless base station indoor coverage system and method based on the FTTR network in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0087] See also Figure 4 , is a schematic diagram of a wireless base station indoor coverage system based on a FTTR network according to an embodiment of the present application:

[0088] The master optical splitter is connected to the OLT and a multi-user network, each of which includes a master device, a slave optical splitter and multiple slave devices;

[0089] A wireless access module, used for accessing a core network, deployed outside the multi-user network, or deployed in a main device of each user network;

[0090] The master device includes a master optical modem, a radio frequency module and a first combiner / demultiplexer, wherein the first combiner / demultiplexer is used to combine a first downlink optical signal with a second downlink optical signal of the master optical modem and send the combined uplink optical signal to a slave optical splitter, and separate the combined uplink optical signal sent by the slave optical splitter into a first uplink optical signal and send it to a wireless access module, and separate it into a second uplink optical signal and send it to the master optical modem, wherein the first downlink optical signal is an optical signal corresponding to a downlink wireless signal from the wireless access module, and the radio frequency module is used to provide wireless coverage for the master device;

[0091] The slave optical splitter is used to split the combined downlink optical signal into multiple channels for transmission to the corresponding slave devices, and to send the combined uplink optical signal sent by the second combiner / demultiplexer of each slave device to the first combiner / demultiplexer;

[0092] The slave device includes a slave optical modem, a slave wireless remote unit RRU and a second combiner / splitter, wherein the second combiner / splitter is used to separate the combined downlink optical signal into a first downlink optical signal and send it to the slave RRU, and separate it into a second downlink optical signal and send it to the slave optical modem, and combine the first uplink optical signal sent by the slave RRU and the second uplink optical signal sent by the optical modem and send them to the slave optical splitter.

[0093] In the embodiment of the present application, the above-mentioned first downlink optical signal is an optical signal corresponding to the downlink wireless signal from the wireless access module, so a corresponding optoelectronic conversion module is required to perform optoelectronic conversion. The above-mentioned wireless access module is used to interact with the core network for data, and can be deployed outside the multi-user network or in the main device of each user network. The positions of the optoelectronic conversion modules corresponding to different deployment situations are also different. The radio frequency module in the above-mentioned main device is a module deployed in the main device to provide wireless coverage. According to the different deployment situations of the wireless access module, the corresponding presentation form is also different. Possible implementation methods are given below. It can be designed in combination with the main optical modem, or it can be designed and placed separately. The above-mentioned slave RRU can be designed in combination with the slave optical modem, or it can be designed and placed separately.

[0094] In the embodiment of the present application, if the wireless access module is deployed outside the multi-user network, one possible form is to include a BBU (Building Base band Unit), then the wireless remote unit RRU can be deployed at both the master optical modem and the slave optical modem. When the master RRU is deployed at the master optical modem, it can be divided into a direct wavelength division scheme and a cascade scheme according to whether the master RRU placed at the master optical modem has data aggregation and distribution capabilities.

[0095] If the wireless access module is deployed as the main device in a multi-user network, an integrated base station with fronthaul function is deployed at the main optical modem, that is, an independent small base station solution is adopted. The small base station uses the local LAN port of the main optical modem for backhaul connection to the core network, and can also be backhauled through other methods, which are not restricted here.

[0096] If the wireless access module is deployed outside the multi-user network, a wireless signal feeding solution can be used to provide wireless signals in the form of a macro base station. A repeater with a digital fronthaul function is placed at the main optical modem. Wireless signals are introduced from a nearby outdoor macro base station through a feeder or antenna. After digitization, indoor coverage is achieved through the FTTR network of the embodiment of the present application.

[0097] Specific implementation methods of the above-mentioned direct wavelength division solution, cascade solution, independent small base station solution and wireless signal feeding solution are given below.

[0098] 1) Direct wavelength division scheme

[0099] In the direct wavelength division scheme, Figure 5 As shown, the wireless access module includes a BBU, which is deployed outside the multi-user network. The system also includes a third combiner and a fourth combiner and a splitter. The RF module is a master RRU with an XGSPON optical module. The entire system consists of a BBU, an OLT, a first combiner and a splitter, a second combiner and a splitter, a third combiner and a splitter, a fourth combiner and a splitter, a passive optical network, an RRU and an optical modem in one device (master device), an RRU and an optical modem in one device (slave device), and a FTTR passive optical network. The function of the indoor coverage system of the wireless base station is composed of a BBU, a master RRU, and a slave RRU. The networking relationship between the BBU and the core network, between the optical modem and the OLT, and between the core network, the OLT, and the Internet is the same as that of the relevant technical implementation, and will not be described in detail here.

[0100] The third combiner / splitter is used to combine the first downstream optical signal sent by the BBU and the fourth downstream optical signal sent by the OLT and send them to the main optical splitter, and separate the combined upstream optical signal received from the main optical splitter into the first upstream optical signal and send it to the BBU, and separate it into the fourth upstream optical signal and send it to the OLT;

[0101] The fourth combiner / splitter is used to separate the combined downlink optical signal sent by the main splitter into a first downlink optical signal and send it to the main RRU, separate it into a fourth downlink optical signal and send it to the main optical modem, and copy the first downlink optical signal and send it to the first combiner / splitter; and combine the first uplink optical signal sent by the main RRU, the first uplink optical signal sent from the RRU through the first combiner / splitter, and the fourth uplink optical signal sent by the main optical modem and send them to the main splitter.

[0102] The main RRU includes a radio frequency processing module for providing wireless signal coverage, and the radio frequency processing module is connected to the XGSPON optical module.

[0103] The XGSPON optical module in the above-mentioned master RRU is used for optical-electrical signal conversion, converting the first downstream optical signal received from the fourth combiner / demultiplexer into an electrical signal, sending a wireless RF electrical signal through the RF processing module, and converting the upstream wireless RF electrical signal sent by the RF processing module into a first upstream optical signal and sending it to the fourth combiner / demultiplexer. The XGSPON optical module in the above-mentioned slave RRU is used for optical-electrical signal conversion, converting the first downstream optical signal received from the second combiner / demultiplexer into an electrical signal, sending a wireless RF electrical signal through the slave RRU, and converting the upstream wireless RF electrical signal into a first upstream optical signal and sending it to the second combiner / demultiplexer.

[0104] In the embodiment of the present application, the first wavelength combiner / demultiplexer, the second wavelength combiner / demultiplexer, the third wavelength combiner / demultiplexer, and the fourth wavelength combiner / demultiplexer perform signal separation according to the wavelength of the signal.

[0105] The RRU and optical modem integrated device (master device) consists of the master RRU, master optical modem, the fourth combiner / demultiplexer, and the first combiner / demultiplexer; the RRU and optical modem integrated device (slave device) consists of the slave RRU, slave optical modem, and the second combiner / demultiplexer. The BBU and OLT are deployed in the access room. The fronthaul optical port of the BBU and the PON port of the OLT are combined through the third combiner / demultiplexer. The BBU and RRU use One of them is used as the wavelength of the upstream data and the other is used as the wavelength of the downstream data. OLT uses wavelengths according to specific technologies. , one as the wavelength for uplink data and the other as the wavelength for downlink data, or use One of them is used as the wavelength of the uplink data, and the other is used as the wavelength of the downlink data. The combined signal passes through the main splitter of the ODN network and is connected to the main device at the home.

[0106] The fourth wavelength combiner / demultiplexer inside the main device separates the wavelength used by the OLT from the wavelength used by the BBU. The wavelength signal used by the OLT is connected to the main optical modem, and the wavelength signal of the BBU is connected to the main RRU and the first wavelength combiner / demultiplexer respectively.

[0107] The second combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the BBU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the RRU is connected to the slave RRU.

[0108] In the embodiment of the present application, the master RRU and the slave RRU in a multi-user network connected to the same optical port of the BBU use the same wavelength for signal transmission.

[0109] In the embodiment of the present application, the above system includes a first-level point-to-multipoint P2MP topology architecture, wherein: the BBU is a master node, and the master RRU and the slave RRU are slave nodes;

[0110] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0111] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0112] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0113] That is, in the downlink direction, the BBU sends the data of all RRUs at the same time, and the main splitter transmits the same signal to all master RRUs and slave RRUs. The master RRUs and slave RRUs obtain the corresponding data according to the time slots allocated to them and use them; in the uplink direction, the master RRUs and slave RRUs obtain the time slots allocated to them through the access process, and transmit data in bursts in the time slots allocated to them. The slave splitter and the main splitter merge the optical signals of all RRUs and transmit them to the BBU. After the BBU processes the data of all RRUs by RF merging, baseband merging, etc., it is sent to the physical layer and high-level modules for subsequent processing.

[0114] In the embodiment of the present application, the master RRU and the slave RRU use time division multiplexing to occupy the PON uplink bandwidth in uplink transmission. The uplink time slots occupied by different RRUs are uniformly allocated by the BBU. Figure 6 As shown, the master RRU and the slave RRU are both used as slave nodes, the BBU is used as the master node, and the schematic diagram of the process of allocating time slot resources to the master node includes:

[0115] Step 601, the master node configures a P2MP frame;

[0116] When the master node allocates time slots, the number of RRUs that can be connected is reasonably set according to the latency requirements of physical layer processing, the technology used by the fronthaul interface (CPRI (Common Public Radio Interface) or eCPRI (enhanced Common Public Radio Interface)), system bandwidth and other parameters, and the P2MP frame is configured according to the number of RRUs that can be connected, including the number and position of uplink time slots, the number and position of downlink time slots, time slot length, frame interval, valid data length, synchronization information length and other parameters.

[0117] Step 602, broadcasting time slot resource allocation information to all slave nodes;

[0118] After completing the P2MP frame, set the occupancy status of all time slots to idle, and broadcast the time slot resource allocation information.

[0119] Step 603, after any slave node is powered on, the configuration state is set to unconnected, and the broadcasted time slot resource allocation information is listened;

[0120] Step 604, selecting an initial access time slot and initiating an access request in the initial access time slot;

[0121] When the slave node is powered on, it listens to the broadcast time slot resource allocation information sent by the master node, calculates the initial access time slot, and initiates the access process on the initial access time slot. When calculating the initial access time slot, the slave node can use a random method or a method of selecting the time slot of the last successful access to speed up the access process.

[0122] Step 605: the master node allocates the initial access time slot to the slave node for occupation according to the access request of the slave node;

[0123] Step 606, the master node broadcasts updated time slot resource allocation information;

[0124] After the master node receives the valid access request data sent by the slave node in the initial access time slot in the uplink time slot, it allocates this time slot to the corresponding RRU ID and updates the state of this time slot to occupied in the broadcast.

[0125] Step 607, the slave node determines whether to allocate the access time slot to itself according to the updated time slot resource allocation information and the RRU ID corresponding to the time slot, and if so, executes step 608, otherwise returns to step 604;

[0126] Step 608, determine to occupy the initial access time slot, configure itself to be in the accessed state, and start sending and receiving uplink and downlink data.

[0127] In the embodiment of the present application, the master RRU of the master device and the slave RRU of the slave device have the same logical topological position in the network and need to share the same uplink wavelength for uplink data transmission. Because the number of RRUs connected to the same BBU fronthaul port is limited by the PON fiber bandwidth, the deployment of multiple RRUs in FTTR limits the number of users in the overall network. The advantage is that the master device is simple to implement and low in cost, and its processor or FPGA only needs to process RRU-related logic and algorithms.

[0128] 2) Cascade solution

[0129] In the cascade scheme, if Figure 7As shown, the wireless access module includes a BBU, and the wireless access module is deployed outside the multi-user network. The system also includes a third combiner and a fourth combiner and a fourth combiner, and the RF module is a master RRU with an XGSPON ONU optical module and an XGSPON OLT optical module. The entire system consists of a BBU, an OLT, a first combiner and a second combiner and a third combiner and a fourth combiner and a fourth combiner and a passive optical network, an RRU and an optical modem in one device (master device), an RRU and an optical modem in one device (slave device), and a FTTR passive optical network. The function of the indoor coverage system of the wireless base station is composed of a BBU, a master RRU, and a slave RRU. The networking relationship between the BBU and the core network, between the optical modem and the OLT, and between the core network, the OLT, and the Internet is the same as that of the relevant technical implementation, and will not be described in detail here.

[0130] The third combiner / splitter is used to combine the third downstream optical signal sent by the BBU and the fourth downstream optical signal sent by the OLT and send them to the main optical splitter, and separate the combined upstream optical signal received from the main optical splitter into the third upstream optical signal and send it to the BBU, and separate it into the fourth upstream optical signal and send it to the OLT;

[0131] The fourth combiner / splitter is used to separate the combined downlink optical signal sent by the main optical splitter into a third downlink optical signal and send it to the main RRU, and separate it into a fourth downlink optical signal and send it to the main optical modem; and combine the third uplink optical signal sent by the main RRU and the fourth uplink optical signal of the main optical modem and send them to the main optical splitter;

[0132] The first combiner / demultiplexer is connected to the XGSPON OLT optical module of the master RRU to send the separated first uplink optical signal to the master RRU;

[0133] The master RRU processes the third downlink optical signal into the first downlink optical signal, and sends it to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent by the slave RRU sent by the first combiner / demultiplexer into the third downlink optical signal. Specifically, the master RRU includes an FPGA fronthaul interface processing module, which is used to perform RF merging or baseband merging processing, and the master RRU also includes a RF processing module, which is connected to the XGSPON ONU optical module via the FPGA fronthaul interface processing module.

[0134] The XGSPON ONU optical module in the above-mentioned master RRU is used for the photoelectric signal conversion between the fourth combiner / demultiplexer and the master RRU, converting the third downlink optical signal received from the fourth combiner / demultiplexer into an electrical signal, sending it to the RF processing module via the FPGA front-haul interface processing module to send the wireless RF electrical signal, broadcasting it via the FPGA front-haul interface processing module, and the XGSPON ONU optical module converts the uplink wireless RF electrical signal sent by the FPGA front-haul interface processing module into a third uplink optical signal and sends it to the fourth combiner / demultiplexer. The XGSPON OLT optical module in the above-mentioned master RRU is used for the photoelectric signal conversion between the master RRU and the first combiner / demultiplexer, converting the first uplink optical signal received from the first combiner / demultiplexer into an electrical signal, performing RF merging or baseband merging processing with the wireless RF electrical signal received from the RF processing module via the FPGA front-haul interface processing module, and the XGSPON OLT optical module converts the downlink wireless RF electrical signal from the FPGA front-haul interface processing module into a first downlink optical signal and sends it to the first combiner / demultiplexer.

[0135] In the embodiment of the present application, the first wavelength combiner / demultiplexer, the second wavelength combiner / demultiplexer, the third wavelength combiner / demultiplexer, and the fourth wavelength combiner / demultiplexer perform signal separation according to the wavelength of the signal.

[0136] The RRU and optical modem integrated device (master device) consists of the master RRU, master optical modem, the fourth combiner / demultiplexer, and the first combiner / demultiplexer; the RRU and optical modem integrated device (slave device) consists of the slave RRU, slave optical modem, and the second combiner / demultiplexer. The BBU and OLT are deployed in the access room. The fronthaul optical port of the BBU and the PON port of the OLT are combined through the third combiner / demultiplexer. The BBU and RRU use One of them is used as the wavelength of the upstream data and the other is used as the wavelength of the downstream data. OLT uses wavelengths according to specific technologies. , one as the wavelength for uplink data and the other as the wavelength for downlink data, or use One of them is used as the wavelength of the uplink data, and the other is used as the wavelength of the downlink data. The combined signal passes through the main splitter of the ODN network and is connected to the main device at the home.

[0137] The fourth combiner / demultiplexer inside the main device separates the wavelength used by the OLT from the wavelength used by the BBU. The wavelength signal used by the OLT is connected to the main optical modem, and the wavelength signal of the BBU is connected to the main RRU.

[0138] The main RRU performs secondary distribution processing of the fronthaul signal. In the downlink direction, the main RRU broadcasts the first downlink optical signal corresponding to the fronthaul data through the XGSPON OLT optical module. In the uplink direction, the main RRU receives the first uplink optical signal corresponding to the burst data sent from the RRU through the XGSPON OLT optical module, converts it into an electrical signal through the XGSPON OLT optical module, and then performs RF merging or baseband merging processing through the FPGA fronthaul interface processing module. The combined signal is converted into a third uplink optical signal through the XGSPON ONU module and transmitted to the BBU for processing through the ODN network.

[0139] The wavelength used by the main RRU in the second level can continue to be used The wavelength signal is combined with the GPON OLT signal of the main optical modem through the first combiner / splitter, and then further transmitted through the slave splitter of the FTTR network.

[0140] The second combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the master RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the master RRU is connected to the slave RRU.

[0141] In this embodiment, the above system includes a two-level P2MP topology architecture, wherein:

[0142] In the first-level P2MP topology, the BBU is the master node and each master RRU is a slave node. In the second-level P2MP topology, the master RRU is the master node and each slave RRU is a slave node.

[0143] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0144] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0145] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0146] That is, the BBU and the master RRU form a point-to-multipoint (P2MP) topology, and the master RRU and the slave RRU also form a point-to-multipoint (P2MP) topology. In each P2MP architecture, in the downlink direction, the master node (BBU or master RRU) sends the data of all slave nodes (master RRU or slave RRU) at the same time, and the optical splitter transmits the same signal to all slave nodes. Each slave node obtains the corresponding data for use according to the uplink time slot allocated to itself; in the uplink direction, the slave node obtains the time slot allocated to itself through the access process, and transmits data in burst mode in the time slot allocated to itself.

[0147] The optical splitter combines the first uplink optical signals of all slave RRUs and transmits them to the master RRU. The FPGA fronthaul interface processing module in the master RRU processes the data of all downstream slave RRUs and the data of the master RRU by means of RF merging, baseband merging, etc., and then continues to upload them through the P2MP network between the BBU and the master RRU.

[0148] The main optical splitter combines the third uplink optical signals of all main RRUs and transmits them to the BBU. The BBU processes the data of all main RRUs by RF combination and baseband combination, and then sends them to the physical layer and high-layer modules for subsequent processing.

[0149] In this embodiment, the slave RRU or the master RRU occupies the PON uplink bandwidth in the uplink transmission by time division multiplexing. The uplink time slots occupied by different RRUs are uniformly allocated by the master RRU or BBU. In the first-level P2MP topology, the master RRU acts as a slave node and the BBU acts as a master node; in the second-level P2MP topology, the slave RRUs all act as slave nodes and the master RRU acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0150] In this solution, the RRU of the master device belongs to the first level in the fronthaul topology, and the RRU of the slave device belongs to the second level. The master RRU needs to perform secondary distribution processing on the fronthaul signal. The master and slave RRU do not need to share the same uplink wavelength for uplink data transmission. Therefore, the number of users connected to a fronthaul interface of the BBU will not be reduced due to the deployment of the slave RRU. The disadvantage is that the processing complexity of the master RRU is increased, and the XGSPON OLT optical module of the master RRU is increased, thereby increasing the cost.

[0151] 3) Independent small base station solution

[0152] In the independent small base station solution, Figure 8 As shown, the radio frequency module adopts a small base station with a fronthaul function, the small base station includes an XGSPON OLT optical module, and the wireless access module is deployed in the main device of each user network, and the local LAN of the main optical modem in the main device is used to access the core network;

[0153] The small base station is connected to the local LAN via a backhaul interface and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module;

[0154] The small base station sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU and sent by the first combiner / demultiplexer.

[0155] The entire system consists of a small base station with fronthaul function and an optical modem integrated device (master device), an RRU and an optical modem integrated device (slave device) and a FTTR passive optical network. The function of the wireless base station indoor coverage system consists of a small base station and a slave RRU. The networking relationship between the small base station and the core network, between the optical modem and the OLT, and between the core network, the OLT and the Internet is the same as that of the related technology implementation, and will not be described in detail in this embodiment.

[0156] The integrated small base station and optical modem with fronthaul function (master device) is composed of a small base station with fronthaul function, a master optical modem, and a first combiner / splitter; the integrated RRU and optical modem (slave device) is composed of a slave RRU, a slave optical modem, and a second combiner / splitter.

[0157] The small base station itself has wireless coverage capability and fronthaul function. The fronthaul uses wavelengths and wavelengths, one of which is used as the wavelength of uplink data and the other as the wavelength of downlink data. It is combined with the GPONOLT signal of the main optical modem through the first combiner / splitter and transmitted through the slave splitter of the FTTR network.

[0158] The small base station also includes an FPGA fronthaul interface processing module, a baseband processing module and a radio frequency processing module. The backhaul interface is connected to the baseband processing module, the baseband processing module is connected to the radio frequency processing module, and the FPGA fronthaul interface processing module is connected to the XGSPON OLT optical module.

[0159] In the downlink direction, the small base station receives core network data through the backhaul interface, and after baseband processing, sends it to the RF processing module and the FPGA fronthaul interface processing module. The RF processing module sends a downlink wireless RF electrical signal, and the FPGA fronthaul interface processing module broadcasts the fronthaul data (i.e., downlink radio signal) through the XGSPON OLT optical module; in the uplink direction, the small base station receives the burst data (i.e., uplink wireless signal) sent from the RRU through the XGSPON OLT optical module, and sends it to the baseband processing module after RF merging or baseband merging processing through the FPGA fronthaul interface processing module. The baseband processing module receives the uplink wireless RF electrical signal from the RF processing module on the one hand, and receives the uplink radio signal from the FPGA fronthaul interface processing module on the other hand. After baseband processing of the merged signal, it is sent to the core network through the backhaul interface.

[0160] The second wavelength combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the RRU is connected to the slave RRU.

[0161] In the embodiment of the present application, the above system includes a first-level P2MP topology architecture, wherein: the small base station is a master node, and the slave RRU is a slave node;

[0162] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0163] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0164] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0165] The small base station and the slave RRU form a point-to-multipoint (P2MP) topology. In the downlink direction, the small base station sends all the slave RRU data at the same time, and the slave splitter transmits the same signal to all the slave RRUs. The slave RRU obtains the corresponding data for use according to the resource location allocated to itself. In the uplink direction, the slave RRU obtains the time slot allocated to it through the access process, and transmits data in its own time slot in a burst manner. The slave splitter merges all the optical signals from the RRU and transmits them to the small base station. The small base station processes the data of all the downstream slave RRUs and the data of the small base station by RF merging, baseband merging, etc., and sends them to the physical layer and high-level modules for subsequent processing.

[0166] In the uplink transmission, the slave RRU uses time division multiplexing to occupy the PON uplink bandwidth. The uplink time slots occupied by different RRUs are uniformly allocated by the small base station. The slave RRU acts as a slave node and the small base station acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0167] In the independent small base station solution, the small base station itself has baseband processing capabilities, which can provide independent carrier exclusive services for FTTR users and provide users with a better access experience. At the same time, the small base station can directly use the broadband provided by the main optical modem for backhaul, which is convenient to use. This solution can be used in scenarios that require higher performance. Its disadvantage is that small base stations are widely distributed, and management and network optimization are more difficult.

[0168] 4) Wireless signal feeding solution

[0169] In the wireless signal feeding scheme of this embodiment, Fig. 9 As shown, the wireless access module is a macro base station deployed outside the multi-user network, the radio frequency module is a repeater, and the repeater includes an XGSPON OLT optical module, wherein:

[0170] The repeater is connected to the macro base station via a radio frequency interface, and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module, sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU by the first combiner / demultiplexer.

[0171] The entire system consists of a repeater with fronthaul function and an optical modem in one device (master device), an RRU and an optical modem in one device (slave device) and a FTTR passive optical network. The function of the wireless base station indoor coverage system consists of a repeater and a slave RRU. The repeater feeds signals from an outdoor macro base station via wired or wireless means. The networking relationships between the macro base station and the core network, between the optical modem and the OLT, and between the core network, the OLT and the Internet are the same as those implemented in related technologies and will not be described in detail in this embodiment.

[0172] The combined equipment of a repeater and an optical modem with fronthaul function (master equipment) is composed of a repeater with fronthaul function, a master optical modem, and a first combiner / demultiplexer; the combined equipment of an RRU and an optical modem (slave equipment) is composed of a slave RRU, a slave optical modem, and a second combiner / demultiplexer.

[0173] The repeater feeds the signal of the outdoor macro base station through the feeder or antenna. It has wireless coverage capability and fronthaul function. The fronthaul uses the wavelength signal to pass through the first combiner / splitter, combine with the GPON OLT signal of the main optical modem, and continue to transmit through the slave splitter of the FTTR network.

[0174] The second combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the master RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the master RRU is connected to the slave RRU.

[0175] In this embodiment, the above system includes a two-level P2MP topology architecture, wherein:

[0176] In the first-level P2MP topology, the BBU is the master node and each master RRU is a slave node. In the second-level P2MP topology, the master RRU is the master node and each slave RRU is a slave node.

[0177] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0178] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0179] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0180] That is, the BBU and the master RRU form a point-to-multipoint (P2MP) topology, and the master RRU and the slave RRU also form a point-to-multipoint (P2MP) topology. In each P2MP architecture, in the downlink direction, the master node (BBU or master RRU) sends the data of all slave nodes (master RRU or slave RRU) at the same time, and the optical splitter transmits the same signal to all slave nodes. Each slave node obtains the corresponding data for use according to the uplink time slot allocated to itself; in the uplink direction, the slave node obtains the time slot allocated to itself through the access process, and transmits data in burst mode in the time slot allocated to itself.

[0181] The optical splitter combines the first uplink optical signals of all slave RRUs and transmits them to the master RRU. The FPGA fronthaul interface processing module in the master RRU processes the data of all downstream slave RRUs and the data of the master RRU by means of RF merging, baseband merging, etc., and then continues to upload them through the P2MP network between the BBU and the master RRU.

[0182] The main optical splitter combines the third uplink optical signals of all main RRUs and transmits them to the BBU. The BBU processes the data of all main RRUs by RF combination and baseband combination, and then sends them to the physical layer and high-layer modules for subsequent processing.

[0183] In this embodiment, the slave RRU or the master RRU occupies the PON uplink bandwidth in the uplink transmission by time division multiplexing. The uplink time slots occupied by different RRUs are uniformly allocated by the master RRU or BBU. In the first-level P2MP topology, the master RRU acts as a slave node and the BBU acts as a master node; in the second-level P2MP topology, the slave RRUs all act as slave nodes and the master RRU acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0184] In this solution, the RRU of the master device belongs to the first level in the fronthaul topology, and the RRU of the slave device belongs to the second level. The master RRU needs to perform secondary distribution processing on the fronthaul signal. The master and slave RRU do not need to share the same uplink wavelength for uplink data transmission. Therefore, the number of users connected to a fronthaul interface of the BBU will not be reduced due to the deployment of the slave RRU. The disadvantage is that the processing complexity of the master RRU is increased, and the XGSPON OLT optical module of the master RRU is increased, thereby increasing the cost.

[0185] 3) Independent small base station solution

[0186] In the independent small base station solution, Figure 8As shown, the radio frequency module adopts a small base station with a fronthaul function, the small base station includes an XGSPON OLT optical module, and the wireless access module is deployed in the main device of each user network, and the local LAN of the main optical modem in the main device is used to access the core network;

[0187] The small base station is connected to the local LAN via a backhaul interface and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module;

[0188] The small base station sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU and sent by the first combiner / demultiplexer.

[0189] The entire system consists of a small base station with fronthaul function and an optical modem integrated device (master device), an RRU and an optical modem integrated device (slave device) and a FTTR passive optical network. The function of the wireless base station indoor coverage system consists of a small base station and a slave RRU. The networking relationship between the small base station and the core network, between the optical modem and the OLT, and between the core network, the OLT and the Internet is the same as that of the related technology implementation, and will not be described in detail in this embodiment.

[0190] The integrated small base station and optical modem with fronthaul function (master device) is composed of a small base station with fronthaul function, a master optical modem, and a first combiner / splitter; the integrated RRU and optical modem (slave device) is composed of a slave RRU, a slave optical modem, and a second combiner / splitter.

[0191] The small base station itself has wireless coverage capability and fronthaul function. The fronthaul uses wavelengths and wavelengths, one of which is used as the wavelength of uplink data and the other as the wavelength of downlink data. It is combined with the GPONOLT signal of the main optical modem through the first combiner / splitter and transmitted through the slave splitter of the FTTR network.

[0192] The small base station also includes an FPGA fronthaul interface processing module, a baseband processing module and a radio frequency processing module. The backhaul interface is connected to the baseband processing module, the baseband processing module is connected to the radio frequency processing module, and the FPGA fronthaul interface processing module is connected to the XGSPON OLT optical module.

[0193] In the downlink direction, the small base station receives core network data through the backhaul interface, and after baseband processing, sends it to the RF processing module and the FPGA fronthaul interface processing module. The RF processing module sends a downlink wireless RF electrical signal, and the FPGA fronthaul interface processing module broadcasts the fronthaul data (i.e., downlink radio signal) through the XGSPON OLT optical module; in the uplink direction, the small base station receives the burst data (i.e., uplink wireless signal) sent from the RRU through the XGSPON OLT optical module, and sends it to the baseband processing module after RF merging or baseband merging processing through the FPGA fronthaul interface processing module. The baseband processing module receives the uplink wireless RF electrical signal from the RF processing module on the one hand, and receives the uplink radio signal from the FPGA fronthaul interface processing module on the other hand. After baseband processing of the merged signal, it is sent to the core network through the backhaul interface.

[0194] The second wavelength combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the RRU is connected to the slave RRU.

[0195] In the embodiment of the present application, the above system includes a first-level P2MP topology architecture, wherein: the small base station is a master node, and the slave RRU is a slave node;

[0196] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0197] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0198] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0199] The small base station and the slave RRU form a point-to-multipoint (P2MP) topology. In the downlink direction, the small base station sends all the slave RRU data at the same time, and the slave splitter transmits the same signal to all the slave RRUs. The slave RRU obtains the corresponding data for use according to the resource location allocated to itself. In the uplink direction, the slave RRU obtains the time slot allocated to it through the access process, and transmits data in its own time slot in a burst manner. The slave splitter merges all the optical signals from the RRU and transmits them to the small base station. The small base station processes the data of all the downstream slave RRUs and the data of the small base station by RF merging, baseband merging, etc., and sends them to the physical layer and high-level modules for subsequent processing.

[0200] In the uplink transmission, the slave RRU uses time division multiplexing to occupy the PON uplink bandwidth. The uplink time slots occupied by different RRUs are uniformly allocated by the small base station. The slave RRU acts as a slave node and the small base station acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0201] In the independent small base station solution, the small base station itself has baseband processing capabilities, which can provide independent carrier exclusive services for FTTR users and provide users with a better access experience. At the same time, the small base station can directly use the broadband provided by the main optical modem for backhaul, which is convenient to use. This solution can be used in scenarios that require higher performance. Its disadvantage is that small base stations are widely distributed, and management and network optimization are more difficult.

[0202] 4) Wireless signal feeding solution

[0203] In the wireless signal feeding scheme of this embodiment, Fig. 9 As shown, the wireless access module is a macro base station deployed outside the multi-user network, the radio frequency module is a repeater, and the repeater includes an XGSPON OLT optical module, wherein:

[0204] The repeater is connected to the macro base station via a radio frequency interface, and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module, sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU by the first combiner / demultiplexer.

[0205] The entire system consists of a repeater with fronthaul function and an optical modem in one device (master device), an RRU and an optical modem in one device (slave device) and a FTTR passive optical network. The function of the wireless base station indoor coverage system consists of a repeater and a slave RRU. The repeater feeds signals from an outdoor macro base station via wired or wireless means. The networking relationships between the macro base station and the core network, between the optical modem and the OLT, and between the core network, the OLT and the Internet are the same as those implemented in related technologies and will not be described in detail in this embodiment.

[0206] The combined equipment of a repeater and an optical modem with fronthaul function (master equipment) is composed of a repeater with fronthaul function, a master optical modem, and a first combiner / demultiplexer; the combined equipment of an RRU and an optical modem (slave equipment) is composed of a slave RRU, a slave optical modem, and a second combiner / demultiplexer.

[0207] The repeater feeds the signal of the outdoor macro base station through the feeder or antenna. It has wireless coverage capability and fronthaul function. The fronthaul uses the wavelength signal to pass through the first combiner / splitter, combine with the GPON OLT signal of the main optical modem, and continue to transmit through the slave splitter of the FTTR network.

[0208] The second combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the master RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the master RRU is connected to the slave RRU.

[0209] In this embodiment, the above system includes a two-level P2MP topology architecture, wherein:

[0210] In the first-level P2MP topology, the BBU is the master node and each master RRU is a slave node. In the second-level P2MP topology, the master RRU is the master node and each slave RRU is a slave node.

[0211] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0212] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0213] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0214] That is, the BBU and the master RRU form a point-to-multipoint (P2MP) topology, and the master RRU and the slave RRU also form a point-to-multipoint (P2MP) topology. In each P2MP architecture, in the downlink direction, the master node (BBU or master RRU) sends the data of all slave nodes (master RRU or slave RRU) at the same time, and the optical splitter transmits the same signal to all slave nodes. Each slave node obtains the corresponding data for use according to the uplink time slot allocated to itself; in the uplink direction, the slave node obtains the time slot allocated to itself through the access process, and transmits data in burst mode in the time slot allocated to itself.

[0215] The optical splitter combines the first uplink optical signals of all slave RRUs and transmits them to the master RRU. The FPGA fronthaul interface processing module in the master RRU processes the data of all downstream slave RRUs and the data of the master RRU by means of RF merging, baseband merging, etc., and then continues to upload them through the P2MP network between the BBU and the master RRU.

[0216] The main optical splitter combines the third uplink optical signals of all main RRUs and transmits them to the BBU. The BBU processes the data of all main RRUs by RF combination and baseband combination, and then sends them to the physical layer and high-layer modules for subsequent processing.

[0217] In this embodiment, the slave RRU or the master RRU occupies the PON uplink bandwidth in the uplink transmission by time division multiplexing. The uplink time slots occupied by different RRUs are uniformly allocated by the master RRU or BBU. In the first-level P2MP topology, the master RRU acts as a slave node and the BBU acts as a master node; in the second-level P2MP topology, the slave RRUs all act as slave nodes and the master RRU acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0218] In this solution, the RRU of the master device belongs to the first level in the fronthaul topology, and the RRU of the slave device belongs to the second level. The master RRU needs to perform secondary distribution processing on the fronthaul signal. The master and slave RRU do not need to share the same uplink wavelength for uplink data transmission. Therefore, the number of users connected to a fronthaul interface of the BBU will not be reduced due to the deployment of the slave RRU. The disadvantage is that the processing complexity of the master RRU is increased, and the XGSPON OLT optical module of the master RRU is increased, thereby increasing the cost.

[0219] 3) Independent small base station solution

[0220] In the independent small base station solution, Figure 8 As shown, the radio frequency module adopts a small base station with a fronthaul function, the small base station includes an XGSPON OLT optical module, and the wireless access module is deployed in the main device of each user network, and the local LAN of the main optical modem in the main device is used to access the core network;

[0221] The small base station is connected to the local LAN via a backhaul interface and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module;

[0222] The small base station sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU and sent by the first combiner / demultiplexer.

[0223] The entire system consists of a small base station with fronthaul function and an optical modem integrated device (master device), an RRU and an optical modem integrated device (slave device) and a FTTR passive optical network. The function of the wireless base station indoor coverage system consists of a small base station and a slave RRU. The networking relationship between the small base station and the core network, between the optical modem and the OLT, and between the core network, the OLT and the Internet is the same as that of the related technology implementation, and will not be described in detail in this embodiment.

[0224] The integrated small base station and optical modem with fronthaul function (master device) is composed of a small base station with fronthaul function, a master optical modem, and a first combiner / splitter; the integrated RRU and optical modem (slave device) is composed of a slave RRU, a slave optical modem, and a second combiner / splitter.

[0225] The small base station itself has wireless coverage capability and fronthaul function. The fronthaul uses wavelengths and wavelengths, one of which is used as the wavelength of uplink data and the other as the wavelength of downlink data. It is combined with the GPONOLT signal of the main optical modem through the first combiner / splitter and transmitted through the slave splitter of the FTTR network.

[0226] The small base station also includes an FPGA fronthaul interface processing module, a baseband processing module and a radio frequency processing module. The backhaul interface is connected to the baseband processing module, the baseband processing module is connected to the radio frequency processing module, and the FPGA fronthaul interface processing module is connected to the XGSPON OLT optical module.

[0227] In the downlink direction, the small base station receives core network data through the backhaul interface, and after baseband processing, sends it to the RF processing module and the FPGA fronthaul interface processing module. The RF processing module sends a downlink wireless RF electrical signal, and the FPGA fronthaul interface processing module broadcasts the fronthaul data (i.e., downlink radio signal) through the XGSPON OLT optical module; in the uplink direction, the small base station receives the burst data (i.e., uplink wireless signal) sent from the RRU through the XGSPON OLT optical module, and sends it to the baseband processing module after RF merging or baseband merging processing through the FPGA fronthaul interface processing module. The baseband processing module receives the uplink wireless RF electrical signal from the RF processing module on the one hand, and receives the uplink radio signal from the FPGA fronthaul interface processing module on the other hand. After baseband processing of the merged signal, it is sent to the core network through the backhaul interface.

[0228] The second wavelength combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the RRU is connected to the slave RRU.

[0229] In the embodiment of the present application, the above system includes a first-level P2MP topology architecture, wherein: the small base station is a master node, and the slave RRU is a slave node;

[0230] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0231] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0232] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0233] The small base station and the slave RRU form a point-to-multipoint (P2MP) topology. In the downlink direction, the small base station sends all the slave RRU data at the same time, and the slave splitter transmits the same signal to all the slave RRUs. The slave RRU obtains the corresponding data for use according to the resource location allocated to itself. In the uplink direction, the slave RRU obtains the time slot allocated to it through the access process, and transmits data in its own time slot in a burst manner. The slave splitter merges all the optical signals from the RRU and transmits them to the small base station. The small base station processes the data of all the downstream slave RRUs and the data of the small base station by RF merging, baseband merging, etc., and sends them to the physical layer and high-level modules for subsequent processing.

[0234] In the uplink transmission, the slave RRU uses time division multiplexing to occupy the PON uplink bandwidth. The uplink time slots occupied by different RRUs are uniformly allocated by the small base station. The slave RRU acts as a slave node and the small base station acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0235] In the independent small base station solution, the small base station itself has baseband processing capabilities, which can provide independent carrier exclusive services for FTTR users and provide users with a better access experience. At the same time, the small base station can directly use the broadband provided by the main optical modem for backhaul, which is convenient to use. This solution can be used in scenarios that require higher performance. Its disadvantage is that small base stations are widely distributed, and management and network optimization are more difficult.

[0236] 4) Wireless signal feeding solution

[0237] In the wireless signal feeding scheme of this embodiment, Fig. 9 As shown, the wireless access module is a macro base station deployed outside the multi-user network, the radio frequency module is a repeater, and the repeater includes an XGSPON OLT optical module, wherein:

[0238] The repeater is connected to the macro base station via a radio frequency interface, and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module, sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU by the first combiner / demultiplexer.

[0239] The entire system consists of a repeater with fronthaul function and an optical modem in one device (master device), an RRU and an optical modem in one device (slave device) and a FTTR passive optical network. The function of the wireless base station indoor coverage system consists of a repeater and a slave RRU. The repeater feeds signals from an outdoor macro base station via wired or wireless means. The networking relationships between the macro base station and the core network, between the optical modem and the OLT, and between the core network, the OLT and the Internet are the same as those implemented in related technologies and will not be described in detail in this embodiment.

[0240] The combined equipment of a repeater and an optical modem with fronthaul function (master equipment) is composed of a repeater with fronthaul function, a master optical modem, and a first combiner / demultiplexer; the combined equipment of an RRU and an optical modem (slave equipment) is composed of a slave RRU, a slave optical modem, and a second combiner / demultiplexer.

[0241] The repeater feeds the signal of the outdoor macro base station through the feeder or antenna, and has wireless coverage capability and fronthaul function. One of them is used as the wavelength of the upstream data, and the other is used as the wavelength of the downstream data. They are combined with the GPON OLT signal of the main optical modem through the first combiner / splitter and transmitted through the slave splitter of the FTTR network.

[0242] The repeater station also includes a radio frequency processing and amplification module, a radio frequency signal digitization module and an FPGA front-haul interface processing module. The radio frequency processing and amplification module is connected to the radio frequency interface and the radio frequency signal digitization module. The radio frequency signal digitization module is connected to the FPGA front-haul interface processing module. The FPGA front-haul interface processing module is connected to the XGSPON OLT optical module.

[0243] In the downlink direction, the repeater receives the downlink wireless RF electrical signal through the RF interface and sends it to the RF processing and amplification module. The RF processing and amplification module amplifies and processes the signal to provide local coverage on the one hand and transmits it to the RF signal digitization module on the other hand; the RF signal digitization module digitizes the signal and sends it to the FPGA fronthaul interface processing module, which broadcasts the fronthaul data, i.e., the first downlink optical signal, through the XGSPON OLT optical module; in the uplink direction, the repeater receives the burst data sent from the RRU through the XGSPON OLT optical module, and sends it to the RF signal digitization module for digitization after RF merging or baseband merging through the FPGA fronthaul interface processing module. After being processed and amplified by the RF processing and amplification module, it is transmitted to the repeater for processing through the RF interface.

[0244] The second wavelength combiner / demultiplexer of the slave device separates the wavelength used by the GPON OLT from the wavelength used by the RRU. The wavelength signal used by the GPON OLT is connected to the slave optical modem, and the wavelength signal of the RRU is connected to the slave RRU.

[0245] In this embodiment, the system includes a first-level P2MP topology architecture, wherein: the repeater is a master node, and the slave RRU is a slave node;

[0246] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0247] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0248] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0249] The repeater and the slave RRU form a point-to-multipoint (P2MP) topology. In the downlink direction, the repeater sends all the slave RRU data at the same time, and the optical splitter transmits the same signal to all the slave RRUs. The slave RRUs obtain the corresponding data for use according to the resource location allocated to them. In the uplink direction, the slave RRU obtains the time slot allocated to it through the access process, and transmits data in its own time slot in a burst manner. The slave optical splitter combines all the optical signals from the RRUs and transmits them to the repeater. The repeater performs RF merging, baseband merging, RF link processing and other processes on the data of all the downstream slave RRUs and the data of the transmitter of this repeater, and then sends them to the macro base station through the receiving end.

[0250] In the uplink transmission, the slave RRU uses time division multiplexing to occupy the PON uplink bandwidth. The uplink time slots occupied by different RRUs are uniformly allocated by the repeater. The slave RRU acts as a slave node and the repeater acts as a master node. The process of the master node allocating time slot resources is the same as the above embodiment and will not be repeated here.

[0251] In the repeater solution of the embodiment of the present application, the repeater can feed the signal of the outdoor macro base station, and can quickly provide independent outdoor macro base station signal services for FTTR users, without the need for baseband processing functions, and the implementation difficulty and cost are relatively low. The disadvantage is that the signal feeding of the repeater requires the laying of coaxial cables and the planning of antenna positions. Improper antenna position layout is prone to self-excitation and deterioration of background noise, and has high construction requirements.

[0252] Based on the same inventive concept, the embodiment of the present application provides a wireless base station indoor coverage method based on FTTR network, such as Fig.10 As shown, including:

[0253] Step 1001, providing wireless coverage of the master device through a radio frequency module of the master device;

[0254] Step 1002: In the downstream direction, the first downstream optical signal is combined with the second downstream optical signal of the master optical modem by the first combiner / demultiplexer and then sent to the slave optical splitter, the slave optical splitter splits the combined downstream optical signal into multiple channels for transmission to the corresponding slave device, and the second combiner / demultiplexer of the slave device separates the combined downstream optical signal into the first downstream optical signal and sends it to the slave RRU, and separates it into the second downstream optical signal and sends it to the slave optical modem;

[0255] Step 1003, in the uplink direction, the first uplink optical signal sent from the RRU and the second uplink optical signal sent from the optical modem are combined by the second combiner / splitter of the slave device and then sent to the slave optical splitter, and the slave optical splitter sends the combined uplink optical signal to the first combiner / splitter of the master device, and the first combiner / splitter separates the combined uplink optical signal into a first uplink optical signal and sends it to the wireless access module, and separates it into a second uplink optical signal and sends it to the master optical modem.

[0256] In some possible embodiments, the system includes at least one level of point-to-multipoint P2MP topology architecture, each level of the P2MP topology architecture includes a master node and a slave node, and further includes:

[0257] The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node;

[0258] In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot;

[0259] In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

[0260] In some possible embodiments, the master node dynamically determines the time slot occupancy information through interaction between the master node and the slave node, including:

[0261] After the master node configures the P2MP frame, it broadcasts the time slot resource allocation information to all slave nodes;

[0262] After being powered on, any slave node listens to the broadcasted time slot resource allocation information, selects an initial access time slot, and initiates an access request in the initial access time slot;

[0263] The master node allocates the initial access time slot to the slave node for occupation according to the access request of the slave node, and broadcasts updated time slot resource allocation information;

[0264] The slave node determines to occupy the initial access time slot according to the updated time slot resource allocation information.

[0265] In some possible embodiments, the master node configures the P2MP frame, including:

[0266] Calculate the number of RRUs based on cell parameters and fronthaul requirements;

[0267] The P2MP frame is configured according to the number of RRUs, including configuring the number and position of uplink time slots, the number and position of downlink time slots, the time slot length, and the frame interval.

[0268] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A wireless base station indoor coverage system based on FTTR network, characterized in that: include: The master optical splitter is connected to the OLT and a multi-user network, each of which includes a master device, a slave optical splitter and multiple slave devices; A wireless access module for accessing a core network adopts a first deployment mode, a second deployment mode, a third deployment mode or a fourth deployment mode, wherein in the first deployment mode, the wireless access module includes a BBU, the wireless access module is deployed outside the multi-user network, the system also includes a third combiner / demultiplexer and a fourth combiner / demultiplexer, and the radio frequency module is a main RRU with an XGSPON optical module; in the second deployment mode, the wireless access module includes a BBU, the wireless access module is deployed outside the multi-user network, the system also includes a third combiner / demultiplexer and a fourth combiner / demultiplexer, and the radio frequency module is a main RRU with an XGSPON ONU optical module and an XGSPON OLT optical module; in the third deployment mode, the wireless access module is combined with the radio frequency module, and a small base station with a fronthaul function is adopted, and the small base station includes an XGSPON OLT optical module, the wireless access module is deployed in the main equipment of each user network, and the local LAN of the main optical modem in the main equipment is used to access the core network; in the fourth deployment mode, the wireless access module is a macro base station deployed outside the multi-user network, the radio frequency module is a repeater with a fronthaul function, and the repeater includes an XGSPON OLT optical module; The master device includes a master optical modem, a radio frequency module and a first combiner / demultiplexer, wherein the first combiner / demultiplexer is used to combine a first downlink optical signal with a second downlink optical signal of the master optical modem and send the combined uplink optical signal to a slave optical splitter, and separate the combined uplink optical signal sent by the slave optical splitter into a first uplink optical signal and send it to a wireless access module, and separate it into a second uplink optical signal and send it to the master optical modem, wherein the first downlink optical signal is an optical signal corresponding to a downlink wireless signal from the wireless access module, and the radio frequency module is used to provide wireless coverage for the master device; The slave optical splitter is used to split the combined downlink optical signal into multiple channels for transmission to the corresponding slave devices, and to send the combined uplink optical signal sent by the second combiner / demultiplexer of each slave device to the first combiner / demultiplexer; The slave device includes a slave optical modem, a slave wireless remote unit RRU and a second combiner / splitter, wherein the second combiner / splitter is used to separate the combined downlink optical signal into a first downlink optical signal and send it to the slave RRU, and separate it into a second downlink optical signal and send it to the slave optical modem, and combine the first uplink optical signal sent by the slave RRU and the second uplink optical signal sent by the optical modem and send them to the slave optical splitter.

2. The system according to claim 1, characterized in that The wireless access module adopts a first deployment mode, wherein: A third combiner / splitter, used for combining the first downstream optical signal sent by the BBU and the fourth downstream optical signal sent by the OLT and sending the combined upstream optical signal received from the main optical splitter into a first upstream optical signal and sending it to the BBU, and into a fourth upstream optical signal and sending it to the OLT; The fourth combiner / splitter is used to separate the combined downlink optical signal sent by the main splitter into a first downlink optical signal and send it to the main RRU, separate it into a fourth downlink optical signal and send it to the main optical modem, and copy the first downlink optical signal and send it to the first combiner / splitter; and combine the first uplink optical signal sent by the main RRU, the first uplink optical signal sent by the slave RRU and the fourth uplink optical signal sent by the main optical modem and send them to the main splitter.

3. The system according to claim 2, characterized in that The system includes a first-level point-to-multipoint P2MP topology architecture, wherein: The BBU is a master node, and the master RRU and the slave RRU are slave nodes; The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node; In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot; In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

4. The system according to claim 1, characterized in that The wireless access module adopts a second deployment mode, wherein: A third combiner / splitter, used for combining the third downstream optical signal sent by the BBU and the fourth downstream optical signal sent by the OLT and sending the combined upstream optical signal received from the main optical splitter into a third upstream optical signal and sending it to the BBU, and into a fourth upstream optical signal and sending it to the OLT; A fourth combiner / splitter, used to separate the combined downlink optical signal sent by the main optical splitter into a third downlink optical signal and send it to the main RRU, and separate it into a fourth downlink optical signal and send it to the main optical modem; and combine the third uplink optical signal sent by the main RRU and the fourth uplink optical signal of the main optical modem and send them to the main optical splitter; The first combiner / demultiplexer is connected to the XGSPON OLT optical module of the master RRU to send the separated first uplink optical signal to the master RRU; The master RRU sends the first downlink optical signal to the first combiner / demultiplexer, and is further configured to combine and process the first uplink optical signal sent by the slave RRU and sent by the first combiner / demultiplexer to obtain a third uplink optical signal.

5. The system according to claim 4, characterized in that The system includes a two-level P2MP topology architecture, wherein: In the first-level P2MP topology, the BBU is the master node and each master RRU is a slave node. In the second-level P2MP topology, the master RRU is the master node and each slave RRU is a slave node. The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node; In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot; In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

6. The system according to claim 1, characterized in that The wireless access module adopts a third deployment mode, wherein: The small base station is connected to the local LAN via a backhaul interface and is connected to the first combiner / demultiplexer via an XGSPON OLT optical module; The small base station sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU and sent by the first combiner / demultiplexer.

7. The system according to claim 6, characterized in that The system includes a first-level P2MP topology architecture, wherein: The small base station is a master node, and the slave RRU is a slave node; The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node; In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot; In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

8. The system according to claim 1, characterized in that The wireless access module adopts a fourth deployment mode, wherein: The repeater is connected to the macro base station through an upper-level RF interface, and is connected to the first combiner / demultiplexer through an XGSPON OLT optical module, sends the first downlink optical signal to the first combiner / demultiplexer, and is also used to combine and process the first uplink optical signal sent from the RRU by the first combiner / demultiplexer.

9. The system according to claim 8, characterized in that The system includes a first-level P2MP topology architecture, wherein: The repeater is a master node, and the slave RRU is a slave node; The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node; In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot; In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

10. A method for indoor coverage of wireless base stations based on an FTTR network based on the system according to any one of claims 1 to 9, characterized in that: include: Providing wireless coverage of the main device through a radio frequency module of the main device; In the downstream direction, the first downstream optical signal is combined with the second downstream optical signal of the master optical modem by the first combiner / demultiplexer and then sent to the slave optical splitter, and the slave optical splitter splits the combined downstream optical signal into multiple channels for transmission to the corresponding slave device, and the second combiner / demultiplexer of the slave device separates the combined downstream optical signal into the first downstream optical signal and sends it to the slave RRU, and separates it into the second downstream optical signal and sends it to the slave optical modem; In the uplink direction, the first uplink optical signal sent from the RRU and the second uplink optical signal sent from the optical modem are combined by the second combiner / splitter of the slave device and sent to the slave optical splitter, and the slave optical splitter sends the combined uplink optical signal to the first combiner / splitter of the master device, and the first combiner / splitter separates the combined uplink optical signal into a first uplink optical signal and sends it to the wireless access module, and separates it into a second uplink optical signal and sends it to the master optical modem.

11. The method according to claim 10, characterized in that The system includes at least one level of point-to-multipoint P2MP topology architecture, each level of the P2MP topology architecture includes a master node and a slave node, and also includes: The master node interacts with the slave nodes, and the master node allocates an uplink time slot to each slave node; In the downlink direction, the master node sends data to all slave nodes simultaneously in the downlink time slot; In the uplink direction, each slave node sends data to the master node in the allocated uplink time slot.

12. The method according to claim 11, characterized in that Through the interaction between the master node and the slave node, the master node dynamically determines the time slot occupancy information, including: After the master node configures the P2MP frame, it broadcasts the time slot resource allocation information to all slave nodes; After being powered on, any slave node listens to the broadcasted time slot resource allocation information, selects an initial access time slot, and initiates an access request in the initial access time slot; The master node allocates the initial access time slot to the slave node for occupation according to the access request of the slave node, and broadcasts updated time slot resource allocation information; The slave node determines to occupy the initial access time slot according to the updated time slot resource allocation information.

13. The method according to claim 12, characterized in that The master node configures the P2MP frame, including: Calculate the number of RRUs based on cell parameters and fronthaul requirements; The P2MP frame is configured according to the number of RRUs, including configuring the number and position of uplink time slots, the number and position of downlink time slots, the time slot length, and the frame interval.

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