5G communication network deployment system based on HFC network and deployment method thereof

Abstract

The invention belongs to the technical field of 5G. According to the 5G communication network deployment system based on the HFC network, head end equipment is connected with an optical node through a trunk optical fiber and an optical distribution network in sequence, the optical node is connected with a user module through a coaxial distribution network, and the head end equipment comprises a first CATV signal end, a first CMTS signal end, a WDM switch, a BBU and a 5G core network; the WDM switch is respectively connected with the first CATV signal end, the first CMTS signal end and the BBU; the BBU is connected with the 5G core network; the first CATV signal end is used for receiving a CATV signal and transmitting the CATV signal to the WDM switch; the first CMTS signal end is used for receiving a CMTS signal and transmitting the CMTS signal to the WDM switch; the BBU is used for processing the 5G signal and then transmitting the 5G signal to the WDM switch; and the WDM switch is used for transmitting the received CATV signal, CMTS signal and 5G signal to the optical node through the trunk optical fiber. The 5G core network, the BBU and the RRU are deployed by using the HFC network, so that the existing HFC network resources are effectively utilized, and the 5G network deployment cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of 5G technology, and specifically relates to a 5G communication network deployment system based on an HFC network and a deployment method thereof. Background Art

[0002] 5G communication technology is called the fifth generation of communication technology. Like the previous 2G, 3G and 4G communication technologies, 5G communication technology is also a mobile wireless network. Compared with previous communication technologies, 5G communication technology has great advantages. It integrates large-scale MIMO technology, non-orthogonal multiple access technology, coding technology, full-duplex communication technology, new modulation technology, network slicing technology, edge computing technology and service-oriented network architecture technology, and has broad application prospects.

[0003] Compared with previous communication technologies, 5G communication technology has the advantages of low latency, high speed, high resource utilization, and low operation and maintenance costs. In terms of transmission speed, the peak transmission rate of 5G communication can reach 10Gbit / s, and the transmission rate has exceeded the existing wired network, which is about 100 times that of the existing 4G communication technology. The application of 5G communication technology can reduce network delay to less than 1 millisecond. While 4G communication technology can only reach 30-70ms, 5G communication technology has great advantages in home network services and data services. In terms of resource utilization, 5G communication technology has high security and permeability. High security is conducive to the construction and application of optical fiber networks, high penetration is conducive to improving wireless transmission communications, and reducing operation and maintenance costs is conducive to improving the economic benefits and market competitiveness of enterprises. 5G communication is more powerful in terms of connection function. 4G can generally only meet 450 connected devices at a time, and the network may be unstable, while 5G can reach 600-1000 connected devices at a time, with better stability. In general, the advantages of 5G communication technology are mainly reflected in energy saving, low cost, high speed, low latency, large capacity, multi-device connection and large capacity. 5G is gaining traction, promising lightning-fast, low-latency connections and ubiquitous coverage. While improving the user experience in gaming, streaming, and online reliability, 5G will open the door to a new world of connectivity.

[0004] Initial 5G coverage is primarily achieved through upgrades to radio equipment at cell tower sites, taking advantage of new radio spectrum availability and processing technologies. However, to achieve 5G speed and latency goals, operators will need to deploy thousands of micro-cell radios in many locations throughout cities, neighborhoods, metropolitan areas, and venues, which introduces new installation and management challenges. Each radio must have a physical high-speed connection for backhaul, permits and locations for the radio, and a reliable power source to keep the radio running. Equipping a new radio site with any of the basic elements requires construction, which causes costs and time delays to spiral upward.

[0005] HFC (Hybrid Fiber Coaxial) refers to a hybrid fiber-coaxial cable network that uses optical fiber to the service area and coaxial cable for the "last mile". Cable TV is the most typical HFC network, and its network structure is as follows: Figure 1 As shown in the figure, it makes reasonable use of the current advanced and mature technologies to provide traditional analog broadcasting and television programs with higher quality and more channels. Today, the deployment of radio and television networks is very mature. In 2019, the DOCSIS transmission technology of the radio and television HFC network has evolved to version 4.0, with the focus on expanding capacity, supporting 10Gbps downstream and 6Gbps upstream, which can provide sufficient bandwidth and low-latency connections for 5G fronthaul, midhaul and backhaul. Summary of the invention

[0006] The present invention aims at the problem that in order to achieve the speed and delay targets of 5G in the prior art, operators need to face large-scale installation and management challenges, and provides a 5G communication network deployment system based on HFC network, wherein the head-end device is connected to the optical node through the trunk optical fiber and the optical distribution network in sequence, and the optical node is connected to the user module through the coaxial distribution network, and the head-end device includes a first CATV signal end, a first CMTS signal end, a WDM switch, a BBU and a 5G core network; the WDM switch is respectively connected to the first CATV signal end, the first CMTS signal end and the BBU; the BBU is connected to the 5G core network;

[0007] The first CATV signal terminal is used to receive the CATV signal and transmit it to the WDM switch;

[0008] The first CMTS signal terminal is used to receive the CMTS signal and transmit it to the WDM switch;

[0009] The BBU is used to process the 5G signal and transmit it to the WDM switch;

[0010] The WDM switch is used to transmit the received CATV signal, CMTS signal and 5G signal to the optical node through the trunk optical fiber.

[0011] In some embodiments, the optical node includes a WDM demultiplexer, an RRU, an R-ONU, and a combiner; the head-end device is connected to the WDM demultiplexer through a trunk optical fiber and an optical distribution network in sequence, the WDM demultiplexer is connected to the R-ONU and the RRU respectively, the RRU is connected to the combiner, and the combiner is connected to the R-ONU and the user module respectively;

[0012] The WDM demultiplexer is used to separate the CATV signal and the CMTS signal and send them to the R-ONU, and separate the 5G signal and send it to the RRU;

[0013] The RRU is used to modulate the received 5G signal into an intermediate frequency signal and transmit it to the combiner;

[0014] The R-ONU is used to convert the received CATV signal and CMTS signal into electrical signals and transmit them to the combiner;

[0015] The combiner is used to combine the 5G signal, CATV signal and CMTS signal and send them to the user module through the coaxial distribution network.

[0016] In some embodiments, there is at least one optical node.

[0017] In some embodiments, the user module includes an FCU, a CM, a 5G signal terminal, a second CATV signal terminal, and a second CMTS signal terminal, the optical node is connected to the FCU through a coaxial distribution network, the FCU is connected to the 5G signal terminal and the CM respectively; the CM is connected to the second CATV signal terminal and the second CMTS signal terminal respectively;

[0018] The FCU is used to separate the CATV signal and the CMTS signal and send them to the CM device, and is also used to restore the 5G signal to the RF signal and send it to the 5G signal end;

[0019] The CM is used to convert the CATV signal and the CMTS signal into digital signals and transmit them to the second CATV signal terminal and the second CMTS signal terminal respectively.

[0020] In some embodiments, there is at least one user module.

[0021] In some embodiments, the WDM switch and the WDM demultiplexer both support wavelength multiplexing of five or more wavelengths and are both capable of processing CPRI and / or eCPRI services.

[0022] The present invention also provides a 5G communication network deployment method based on an HFC network for any of the above-mentioned systems, comprising the following steps:

[0023] Step 1: The system receives CATV signals, CMTS signals, and 5G signals, and processes the 5G signals using the BBU;

[0024] Step 2: The system uses a WDM switch to transmit the above CATV signal, CMTS signal and processed 5G signal to the optical node through the trunk optical fiber;

[0025] Step 3: The system uses the WDM demultiplexer in the optical node to separate the CATV signal, CMTS signal, and 5G signal;

[0026] Step 4: The system uses the R-ONU in the optical node to convert CATV signals and CMTS signals into electrical signals; and uses the RRU to modulate the 5G signal into a 5G intermediate frequency signal;

[0027] Step 5: The system uses the combiner in the optical node to combine the 5G intermediate frequency signal, CATV electrical signal and CMTS electrical signal and sends them to the user module through the coaxial distribution network;

[0028] Step 6: The system uses the FCU in the user module to separate the CATV electrical signal and the CMTS electrical signal, and restores the 5G intermediate frequency signal to the radio frequency signal, and sends it to the 5G signal end;

[0029] Step 7: The system uses CM to convert the CATV electrical signal and the CMTS electrical signal into digital signals and transmits them to the second CATV signal terminal and the second CMTS signal terminal respectively.

[0030] In some embodiments, there is at least one optical node.

[0031] In some embodiments, there is at least one user module.

[0032] In some embodiments, the WDM switch and the WDM demultiplexer both support wavelength multiplexing of five or more wavelengths and are both capable of processing CPRI and / or eCPRI services.

[0033] The beneficial effects of the present invention are as follows: the present invention utilizes the HFC network to deploy the 5G core network, BBU and RRU, combines the existing cable TV and broadband network infrastructure with 5G wireless communication technology, can effectively utilize the existing HFC network resources, reduce the cost of 5G network deployment, and speed up 5G construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 , a simplified diagram of the HFC network structure in the background technology of the present invention.

[0035] Figure 2 , structural diagram of the head-end device in Example 1 of the present invention.

[0036] Figure 3 , structural diagram of the optical node in Example 1 of the present invention.

[0037] Figure 4 , structural diagram of the user module in Example 1 of the present invention.

[0038] Figure 5 , a structural diagram of a 5G communication network deployment system based on HFC network in Example 1 of the present invention. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0040] Example

[0041] In this example, a 5G communication network deployment system based on HFC network is provided. It mainly includes three parts: head-end equipment, optical node and user module. The head-end equipment is connected to the optical node through the trunk optical fiber and optical distribution network in turn, and the optical node is connected to the user module through the coaxial distribution network.

[0042] 1. Headend equipment (i.e. central computer room)

[0043] like Figure 2 As shown, the head-end device includes a first CATV signal terminal, a first CMTS signal terminal, a WDM switch, a BBU and a 5G core network; the WDM switch is respectively connected to the first CATV signal terminal, the first CMTS signal terminal and the BBU (Building Baseband Unit, indoor baseband processing unit); the BBU is connected to the 5G core network.

[0044] The first CATV signal terminal is used to receive the CATV signal and transmit it to the WDM switch;

[0045] The first CMTS signal terminal is used to receive the CMTS signal and transmit it to the WDM switch;

[0046] The BBU is used to process the 5G signal and transmit it to the WDM switch;

[0047] The WDM switch is used to transmit the received CATV signal, CMTS signal and 5G signal to the optical node through the trunk optical fiber.

[0048] In this example, the 5G core network and BBU equipment are deployed at the head-end device to access the HFC network optical node through the WDM switch device. The WDM switch needs to access the original CMTS and CATV signals as well as the 5G signals at the same time.

[0049] Among them, the WDM (Wavelength Division Multiplexing) switch is a network device that can transmit multiple wavelengths simultaneously on a single optical fiber through wavelength division multiplexing technology. Each wavelength can carry different data streams. These optical signals will not interfere with each other during transmission, thereby significantly improving the transmission bandwidth.

[0050] In order to avoid conflicts between CATV signals, CMTS uplink and downlink signals and 5G uplink and downlink signals when they are transmitted in the same optical fiber. In this example, WDM technology is used to allocate different service signals to different optical wavelengths for transmission. The specific allocation can be as follows: CATV signals usually use a 1550nm wavelength. DOCSIS (CMTS uplink / downlink) signals usually use 1310nm (uplink) and 1490nm (downlink). 5G signals can be transmitted in optical fibers using other wavelengths, such as 1270nm (uplink) and 1577nm (downlink), and communication between BBU and RRU is achieved through CPRI or eCPRI protocols. Therefore, the WDM switch needs to have the ability to multiplex more than 5 wavelengths and be able to handle CPRI and / or eCPRI services.

[0051] 2. Optical Node

[0052] like Figure 3 As shown, the optical node includes a WDM demultiplexer, an RRU, an R-ONU, and a combiner; the head-end device is connected to the WDM demultiplexer through the trunk optical fiber and the optical distribution network in turn, the WDM demultiplexer is connected to the R-ONU and the RRU respectively, the RRU is connected to the combiner, and the combiner is connected to the R-ONU and the user module respectively. In actual deployment, the optical node is usually arranged in the corridor of the community.

[0053] There is at least one optical node. Usually, one BBU can carry 6-18 RRUs (Remote Radio Units). Each RRU corresponds to an optical node. When applied, optical nodes can be increased or decreased according to demand. Multiple optical nodes are connected in parallel through an optical distribution network.

[0054] The WDM demultiplexer separates the CATV signal and CMTS signal and sends them to the R-ONU, and separates the 5G signal and sends it to the intermediate frequency RRU. The demultiplexing WDM equipment also needs to have the ability to multiplex more than 5 wavelengths and be able to handle CPRI or eCPRI services.

[0055] The RRU modulates the received 5G signal into an intermediate frequency signal and transmits it to the combiner. The R-ONU (Remote Optical Network Unit) converts the received CATV signal and CMTS signal into electrical signals and transmits them to the combiner.

[0056] The 5G signal, CATV signal and CMTS signal are combined by a combiner and then enter the user module through the coaxial distribution network.

[0057] Compared with the existing technology, this example adds a 5G-IF RRU and a combiner at the optical node. Usually, 5G signals are high-frequency signals. In this example, in order to reduce the signal loss in the coaxial cable, the 5G signal is transmitted using an IF. The selection of the IF needs to avoid overlapping with the CATV / CMTS signal spectrum (5-1000MHz).

[0058] 3. User Module

[0059] like Figure 4 As shown, the user module includes FCU, CM, 5G signal terminal, second CATV signal terminal and second CMTS signal terminal. The optical node is connected to FCU through a coaxial distribution network. FCU is connected to 5G signal terminal and CM respectively; CM is connected to second CATV signal terminal and second CMTS signal terminal respectively. The user module can be one or multiple in parallel. In actual deployment, the module is usually set in the user's room.

[0060] Compared with the prior art, this example adds an FCU device to the user module. After the 5G signal is combined with the CATV and CMTS signals, it enters the user's room through the coaxial distribution network and is first sent to the FCU device. On the one hand, the FCU device can separate the CATV signal and the CMTS signal and send them to the CM device. On the other hand, it can complete the recovery of the 5G intermediate frequency signal to the radio frequency signal and send it to the 5G signal end, thereby introducing the 5G signal into the room and solving the problem of 5G signal coverage blind spots. After the CM converts the CATV signal and the CMTS signal into digital signals, it is transmitted to the second CATV signal end (which can be a TV) and the second CMTS signal end (which can be a PC) respectively.

[0061] In summary, in practical applications, the overall structure of this example is as follows Figure 5 As shown in the figure, by deploying 5G core network and BBU equipment in the central computer room, deploying intermediate frequency RRU and combiner at the optical node, and installing FCU equipment in the user's room, it is possible to deploy 5G communication network through the original HFC network of radio and television. If the original WDM switch and demultiplexing WDM equipment do not support wavelength multiplexing of more than five wavelengths and process CPRI and / or e-CPRI services, they need to be replaced. Without the need to build base stations on a large scale, indoor coverage of 5G network can be achieved.

[0062] Those skilled in the art will understand that Figure 2-5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0063] Example 2

[0064] In this example, a 5G communication network deployment method based on an HFC network is provided, which can be applied to the system provided in Example 1, thereby realizing the deployment of a 5G communication network through the original HFC network of radio and television.

[0065] Step 1: The system receives CATV signals, CMTS signals and 5G signals through the first CATV signal terminal, the first CMTS signal terminal and the 5G core network respectively, and processes the 5G signals using the BBU;

[0066] Step 2: The system uses a WDM switch to transmit the above CATV signal, CMTS signal and processed 5G signal to the optical node through the trunk optical fiber;

[0067] Step 3: The system uses the WDM demultiplexer in the optical node to separate the CATV signal, CMTS signal, and 5G signal;

[0068] Step 4: The system uses the R-ONU in the optical node to convert CATV signals and CMTS signals into electrical signals; and uses the RRU to modulate the 5G signal into a 5G intermediate frequency signal;

[0069] Step 5: The system uses the combiner in the optical node to combine the 5G intermediate frequency signal, CATV electrical signal and CMTS electrical signal and sends them to the user module through the coaxial distribution network;

[0070] Step 6: The system uses the FCU in the user module to separate the CATV electrical signal and the CMTS electrical signal, and restores the 5G intermediate frequency signal to the radio frequency signal, and sends it to the 5G signal end;

[0071] Step 7: The system uses CM to convert the CATV electrical signal and the CMTS electrical signal into digital signals and transmits them to the second CATV signal terminal and the second CMTS signal terminal respectively.

[0072] There is at least one optical node, and multiple optical nodes can be connected in parallel through an optical distribution network. There is at least one user module. Moreover, both the WDM switch and the WDM demultiplexer support wavelength multiplexing of more than five wavelengths, and can process CPRI and / or eCPRI services.

[0073] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A 5G communication network deployment system based on HFC network, wherein the head-end device is connected to the optical node through the trunk optical fiber and the optical distribution network in sequence, and the optical node is connected to the user module through the coaxial distribution network, characterized in that: The head-end device includes a first CATV signal terminal, a first CMTS signal terminal, a WDM switch, a BBU and a 5G core network; the WDM switch is connected to the first CATV signal terminal, the first CMTS signal terminal and the BBU respectively; the BBU is connected to the 5G core network; The first CATV signal terminal is used to receive the CATV signal and transmit it to the WDM switch; The first CMTS signal terminal is used to receive the CMTS signal and transmit it to the WDM switch; The BBU is used to process the 5G signal and transmit it to the WDM switch; The WDM switch is used to transmit the received CATV signal, CMTS signal and 5G signal to the optical node through the trunk optical fiber.

2. According to claim 1, a 5G communication network deployment system based on HFC network is characterized in that: The optical node includes a WDM demultiplexer, an RRU, an R-ONU and a combiner; the head-end device is connected to the WDM demultiplexer through a trunk optical fiber and an optical distribution network in sequence, the WDM demultiplexer is connected to the R-ONU and the RRU respectively, the RRU is connected to the combiner, and the combiner is connected to the R-ONU and the user module respectively; The WDM demultiplexer is used to separate the CATV signal and the CMTS signal and send them to the R-ONU, and separate the 5G signal and send it to the RRU; The RRU is used to modulate the received 5G signal into an intermediate frequency signal and transmit it to the combiner; The R-ONU is used to convert the received CATV signal and CMTS signal into electrical signals and transmit them to the combiner; The combiner is used to combine the 5G signal, CATV signal and CMTS signal and send them to the user module through the coaxial distribution network.

3. According to claim 2, a 5G communication network deployment system based on HFC network is characterized in that: The number of the optical node is at least one.

4. According to claim 3, a 5G communication network deployment system based on HFC network is characterized in that: The user module includes an FCU, a CM, a 5G signal terminal, a second CATV signal terminal and a second CMTS signal terminal. The optical node is connected to the FCU through a coaxial distribution network. The FCU is connected to the 5G signal terminal and the CM respectively; the CM is connected to the second CATV signal terminal and the second CMTS signal terminal respectively; The FCU is used to separate the CATV signal and the CMTS signal and send them to the CM device, and is also used to restore the 5G signal to the RF signal and send it to the 5G signal end; The CM is used to convert the CATV signal and the CMTS signal into digital signals and transmit them to the second CATV signal terminal and the second CMTS signal terminal respectively.

5. A 5G communication network deployment system based on HFC network according to claim 4, characterized in that: There is at least one user module.

6. A 5G communication network deployment system based on HFC network according to claim 5, characterized in that: The WDM switch and WDM demultiplexer both support wavelength multiplexing of more than five wavelengths and can process CPRI and / or eCPRI services.

7. A 5G communication network deployment method based on HFC network for the system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: The system receives CATV signals, CMTS signals, and 5G signals, and processes the 5G signals using the BBU; Step 2: The system uses a WDM switch to transmit the above CATV signal, CMTS signal and processed 5G signal to the optical node through the trunk optical fiber; Step 3: The system uses the WDM demultiplexer in the optical node to separate the CATV signal, CMTS signal, and 5G signal; Step 4: The system uses the R-ONU in the optical node to convert CATV signals and CMTS signals into electrical signals; and uses the RRU to modulate the 5G signal into a 5G intermediate frequency signal; Step 5: The system uses the combiner in the optical node to combine the 5G intermediate frequency signal, CATV electrical signal and CMTS electrical signal and sends them to the user module through the coaxial distribution network; Step 6: The system uses the FCU in the user module to separate the CATV electrical signal and the CMTS electrical signal, and restores the 5G intermediate frequency signal to the radio frequency signal, and sends it to the 5G signal end; Step 7: The system uses CM to convert the CATV electrical signal and the CMTS electrical signal into digital signals and transmits them to the second CATV signal terminal and the second CMTS signal terminal respectively.

8. A 5G communication network deployment method based on HFC network according to claim 7, characterized in that: The number of the optical node is at least one.

9. A 5G communication network deployment method based on HFC network according to claim 8, characterized in that: There is at least one user module.

10. A 5G communication network deployment method based on HFC network according to claim 9, characterized in that: The WDM switch and WDM demultiplexer both support wavelength multiplexing of more than five wavelengths and can process CPRI and / or eCPRI services.

Images