CN214380909U

CN214380909U - Double-single-mode double-fiber base station transmission system based on LTE

Info

Publication number: CN214380909U
Application number: CN202120708587.7U
Authority: CN
Inventors: 张瑞; 史故臣; 蒋维; 范明凯
Original assignee: Zhejiang Shuren University
Current assignee: Zhejiang Shuren University
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-10-08
Anticipated expiration: 2031-04-08

Abstract

The utility model relates to the technical field of wireless communication, specifically speaking relates to a two single mode two fine basic station transmission systems based on LTE, including the optic fibre looped netowrk, in the optic fibre looped netowrk, optic fibre equidistant setting along the line a plurality of basic stations, a plurality of basic stations constitute synchronous looped netowrk and data center hookup through the optic fibre looped netowrk, are equipped with a plurality of mobile terminal at random in the coverage area of basic station, are equipped with the equipment integrated circuit board in the basic station, and the equipment integrated circuit board includes the MCU singlechip, is equipped with the radio frequency circuit board on the MCU singlechip. The utility model discloses a set up little basic station system, the frequency that can reduce the unauthorized license frequency channel is high, the great limitation of propagation loss, basic station operation in-process, can support the looped netowrk of two optical fiber mouths to can the bandwidth of rational distribution pilot frequency network deployment, select idle channel and guarantee the seamless level and smooth switching between the different channels, improve the interference between the different channels and avoid and disturb the coordination performance, can lift high frequency spectrum resource utilization to a certain extent, make things convenient for people to live.

Description

Double-single-mode double-fiber base station transmission system based on LTE

Technical Field

The utility model relates to a wireless communication technology field, specifically speaking relates to a two single mode two fine basic station transmission systems based on LTE.

Background

With the continuous progress of society, the service types and service demands of wireless communication are rapidly increasing, and thus higher requirements are put on communication rate, communication capacity, communication delay, communication security and the like. In order to meet the requirements of people on high communication rate, large system capacity, diversified services and the like, the industry and academia propose to utilize the LTE-U technology as a supplement to the LTE system with the licensed frequency band. However, at present, there is no perfect wireless network transmission system which can supplement the LTE, and can be networked separately and applied to the small base station.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two single mode double fiber basic station transmission systems based on LTE to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a two single mode two fine basic station transmission system based on LTE, includes the optic fibre looped netowrk, in the optic fibre looped netowrk, optic fibre equidistant a plurality of basic stations that set up along the line, it is a plurality of the basic station passes through the optic fibre looped netowrk is constituteed synchronous looped netowrk and data center hookup, be equipped with a plurality of mobile terminal at random in the coverage area of basic station, be equipped with the equipment integrated circuit board in the basic station, the equipment integrated circuit board includes the MCU singlechip, be equipped with the radio frequency circuit board on the MCU singlechip, there is application terminal data center still through fiber connection outward.

Preferably, the base station is wirelessly connected with the optical fiber ring network.

Preferably, the distance between two adjacent base stations is one kilometer.

Preferably, the base station is connected with the mobile terminal through broadband communication, and the mobile terminal and the base station communicate with each other by using a 5.8G frequency band.

Preferably, each base station may perform broadband communication with a plurality of mobile terminals at the same time, an optional WIFI antenna is attached to each mobile terminal, and the mobile terminals may switch between coverage areas of different base stations during a moving process.

Preferably, the uplink rate from the mobile terminal to the base station and the downlink rate from the base station to the mobile terminal adopt an asymmetric mode.

Preferably, an Ethernet PHY chip, an FPGA functional module and a DDR double-rate synchronous dynamic random access memory are regularly arranged in the middle of the MCU singlechip, a plurality of SFP functional modules are arranged at the outer edge of one side of the MCU singlechip, which is far away from the radio frequency circuit board, side by side, and a wireless WIFI interface and an Ethernet optical port are sequentially arranged below the SFP functional modules from top to bottom.

Preferably, the FPGA functional module is configured to receive SDI and 1-way gigabit networks, and the SFP functional module is configured to send 1 SDI +1 gigabit networks.

Preferably, an AD9364 broadband transceiver module is arranged on the radio frequency circuit board, and three antennas are arranged at the outer edge of the radio frequency circuit board side by side.

Preferably, the AD9364 wideband transceiver module is configured to implement zero-if modulation, where two of the antennas are RX and TX, respectively, and another of the antennas is a GPS antenna, and the GPS antenna is configured to control timing synchronization of the multiple base stations, so as to ensure that no collision occurs in a designed communication window.

Compared with the prior art, the beneficial effects of the utility model are that: this two single mode double fiber base station transmission system based on LTE, through setting up little basic station system, can reduce the frequency height of unauthorized license frequency channel, the great limitation of propagation loss, through adopting the base station of two single mode double fiber designs, can combine optic fibre looped netowrk to constitute synchronous looped netowrk, be convenient for with data center hookup, in the operation of base station, can support the looped netowrk access of two fiber optic mouths, and the bandwidth of different frequency networks can rationally be distributed, select idle channel and guarantee the seamless smooth switch between the different channels, improve the interference avoidance and the interference coordination performance between the different channels, especially can provide high-speed data access service for terminal user in hot spot area, office space, area that the signal can not cover etc., can improve spectrum resource utilization ratio to a certain extent, make things convenient for people's life.

Drawings

FIG. 1 is a block diagram of the overall system structure of the utility model;

FIG. 2 is a block diagram of the structure of the device board of the utility model;

FIG. 3 is a diagram of the topology of the middle ring network center and the base station network of the utility model;

fig. 4 is a partial structure diagram of the pilot frequency networking in the utility model.

In the figure:

1. an optical fiber ring network;

2. a base station;

3. a data center;

4. a mobile terminal;

5. an equipment board card; 51. MCU single chip; 511. an Ethernet PHY chip; 512. an FPGA functional module; 513. DDR double rate synchronous dynamic random access memory; 514. an SFP function module; 515. a wireless WIFI interface; 516. an Ethernet optical port; 52. a radio frequency circuit board; 521. an AD9364 broadband transceiver module; 522. an antenna;

6. and (5) applying the terminal.

Detailed Description

The technical solution in the present invention will be clearly and completely described below with reference to the drawings in the present invention, and it is obvious that the described utility model is only a part of the utility model rather than the whole utility model. Based on utility model provides a, all other utility model that the ordinary skilled person in the art obtained under the prerequisite of not making creative work all belong to the utility model discloses the scope of protection.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the designated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Referring to fig. 1-4, the present invention provides a technical solution:

the utility model provides a two single mode two fine basic station transmission systems based on LTE, including optic fibre looped netowrk 1, in the optic fibre looped netowrk 1, optic fibre equidistant a plurality of basic stations 2 that set up along the line, a plurality of basic stations 2 constitute synchronous looped netowrk through optic fibre looped netowrk 1 and 3 hookups of data center, be equipped with a plurality of mobile terminal 4 at random in the coverage area of basic station 2, be equipped with equipment integrated circuit board 5 in the basic station 2, equipment integrated circuit board 5 includes MCU singlechip 51, be equipped with radio frequency circuit board 52 on the MCU singlechip 51, 3 outer application terminal 6 that still have through fiber connection of data center.

In this embodiment, the base station 2 is wirelessly connected to the optical fiber ring network 1.

In this embodiment, the distance between two adjacent base stations 2 is one kilometer.

It should be noted that, an overlapping area exists between coverage areas of two adjacent base stations 2, which is convenient to maintain the continuity of communication and avoid the situation that the mobile terminal 4 is interrupted in the moving process.

In this embodiment, the base station 2 and the mobile terminal 4 are connected by broadband communication, and the mobile terminal 4 and the base station 2 communicate by using a 5.8G frequency band.

In this embodiment, each base station 2 can perform broadband communication with a plurality of mobile terminals 4 at the same time.

Further, the number of mobile terminals 4 that can be accessed by one base station 2 at the same time is at most N, where N can be configured, such as 32, 64, 128, etc., and the communication magnification of the base station 2 and each mobile terminal 4 is automatically adjusted according to the number of mobile terminals 4 that can be accessed at the same time.

Further, an optional WIFI antenna is attached to the mobile terminal 4, and the mobile terminal 4 can be switched between coverage areas of different base stations 2 during a moving process.

Since the WIFI and the LTE have a conflict in the same frequency band, the WIFI frequency band attached to the mobile terminal 4 is temporarily selected to be 2.4G.

In this embodiment, the uplink rate from the mobile terminal 4 to the base station 2 and the downlink rate from the base station 2 to the mobile terminal 4 adopt an asymmetric mode.

Specifically, the uplink rate is low, the downlink rate is high, and the ratio of the uplink rate to the downlink rate can be configured.

In this embodiment, the device board 5 is composed of an SFP function module 514, an FPGA function module 512, and a 6095 function module, and an LTE-U communication protocol is developed based on the device board 5.

Specifically, the LTE-U communication protocol includes an FPGA program composed of functions of a clock network, an interface timing, a time slot control, a digital modulator, a digital demodulator, and the like.

The digital modulator comprises a PN generator, a modulation mapper, a bandwidth control, a differential encoder, inverse Fourier transform, a cyclic prefix, an interpolation filter, a digital up-converter and a transmitting end gain controller; the digital demodulator comprises a receiving end gain controller, a digital down converter, a carrier phase-locked filter loop, a value-reducing filter, a PN correlator, an OFDM correlator, Fourier transform, a differential decoder, a channel and carrier estimation, wherein the channel equalization demodulation reflects the phase rotation of the transmitter and then processes pilot frequency removal, thereby realizing LET-U protocol.

Further, 3 gigabit connections are arranged in the 6095 functional module, wherein 1 is a panel electrical port, 1 is used as a hundred mega MII to be connected with the MCU, and the other is used as a GMII to be connected with the FPGA.

In this embodiment, the middle of the MCU single chip 51 is regularly provided with an ethernet PHY chip 511, an FPGA functional module 512, and a DDR double-data-rate synchronous dynamic random access memory 513, the outer edge of one side of the MCU single chip 51, which is far away from the radio frequency circuit board 52, is provided with a plurality of SFP functional modules 514 side by side, and the lower side of the SFP functional modules 514 is sequentially provided with a wireless WIFI interface 515 and an ethernet optical port 516 from top to bottom.

Further, the FPGA functional module 512 is configured to receive the SDI and the 1-way gigabit network, where the FPGA functional module 512 and the SDI are encoded according to a protocol, and transmit through serdes, and receive data from serdes at the same time, and decode GMII data and other service data.

Further, the SFP function module 514 is configured to transmit 1 SDI +1 gigabit network, where the gigabit network is bidirectional, and has a forward bandwidth of 2.97G and a reverse bandwidth of 1.25G.

In this embodiment, the radio frequency circuit board 52 is provided with an AD9364 broadband transceiver module 521, and three antennas 522 are arranged side by side at the outer edge of the radio frequency circuit board 52.

In this embodiment, the AD9364 broadband transceiver module 521 is configured to implement zero-if modulation, where two antennas 522 are RX and TX, respectively, and another antenna 522 is a GPS antenna, and the GPS antenna is configured to control timing synchronization of multiple base stations 2, so as to ensure that designed communication windows do not collide with each other.

Further, the base station 2 adopts a double single mode double fiber design.

Specifically, in the optical fiber ring network 1, the maximum accessible number of the base stations 2 is 255, and the IP of the base station 2 is the IP address of the CPU.

It is worth noting that in the networking design of a plurality of base stations 2, the inter-frequency networking needs to be noticed; under the condition of meeting different-frequency networking, the available frequency is 4.9 GHz-5.9 GHz, and the 1GHz frequency band is divided into 8 frequency bands; each frequency band occupies 125MHz bandwidth; each band contains 8 channels 51MHz wide; thus, for a base station 2, when the frequency band of the frequency point used by it is selected, it has 8 channels that can be used to avoid the frequency interference of other signals.

The utility model discloses a two single mode double fiber basic station transmission systems based on LTE are when using, and basic station 2 uses Intel FPGA to realize that the retransmission of network package is filtered, the code, the baseband is handled, uses omnidirectional antenna to go out signal transmission, and the antenna that uses another port simultaneously gets off from mobile terminal 4's signal reception, gets back to FPGA functional module 512 through AD9364 broadband transceiver module 521 processing and receives the demodulation, sends to the network port at last on to get back to data center 3.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. The technical personnel of this trade should understand, the utility model does not receive the restriction of above-mentioned utility model, and what describe in above-mentioned utility model and the description only does the preferred example of the utility model to need not restrict the utility model, under the prerequisite that does not deviate from the spirit and scope of the utility model, the utility model discloses still can have various changes and improvement, these changes and improvement all fall into the scope of the utility model that claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A double single mode double fiber base station transmission system based on LTE is characterized in that: including optic fibre looped netowrk (1), in optic fibre looped netowrk (1), optic fibre equidistant a plurality of basic stations (2), a plurality of along the line base station (2) are passed through optic fibre looped netowrk (1) is constituteed synchronous looped netowrk and data center (3) hookup, be equipped with a plurality of mobile terminal (4) at random in the coverage area of basic station (2), be equipped with equipment integrated circuit board (5) in basic station (2), equipment integrated circuit board (5) include MCU singlechip (51), be equipped with radio frequency circuit board (52) on MCU singlechip (51), data center (3) still have application terminal (6) through optical fiber connection outward.

2. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: and the base station (2) is in wireless connection with the optical fiber ring network (1).

3. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: the spacing distance between two adjacent base stations (2) is one kilometer.

4. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: the base station (2) is connected with the mobile terminal (4) through broadband communication, and the mobile terminal (4) is communicated with the base station (2) through a 5.8G frequency band.

5. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: each base station (2) can simultaneously carry out broadband communication with a plurality of mobile terminals (4), optional WIFI antennas are attached to the mobile terminals (4), and the mobile terminals (4) can be switched among coverage areas of different base stations (2) in the moving process.

6. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: the uplink rate from the mobile terminal (4) to the base station (2) and the downlink rate from the base station (2) to the mobile terminal (4) adopt an asymmetric mode.

7. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: the MCU single chip microcomputer (51) is regularly provided with an Ethernet PHY chip (511), an FPGA functional module (512) and a DDR double-rate synchronous dynamic random access memory (513), the MCU single chip microcomputer (51) is provided with a plurality of SFP functional modules (514) at the outer edge of one side far away from the radio frequency circuit board (52), and the lower part of the SFP functional modules (514) is sequentially provided with a wireless WIFI interface (515) and an Ethernet optical port (516) from top to bottom.

8. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 7, wherein: the FPGA functional module (512) is used for receiving SDI and 1-path gigabit networks, and the SFP functional module (514) is used for sending 1 SDI +1 gigabit networks.

9. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 1, wherein: the radio frequency circuit board (52) is provided with an AD9364 broadband transceiver module (521), and the outer edge of the radio frequency circuit board (52) is provided with three antennas (522) side by side.

10. The LTE-based dual-single-mode dual-fiber base station transmission system according to claim 9, wherein: the AD9364 broadband transceiver module (521) is used for realizing zero intermediate frequency modulation, wherein two antennas (522) are RX and TX respectively, the other antenna (522) is a GPS antenna, and the GPS antenna is used for controlling timing synchronization of a plurality of base stations (2) and ensuring that designed communication windows do not conflict.