CN218277159U

CN218277159U - Micro-distribution system

Info

Publication number: CN218277159U
Application number: CN202222702691.2U
Authority: CN
Inventors: 张亚明; 李正豪; 付喜民
Original assignee: Sichuan Dajtechnology Co ltd
Current assignee: Sichuan Dajtechnology Co ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2023-01-10
Anticipated expiration: 2032-10-13

Abstract

The embodiment of the application discloses a microdistribution system relates to wireless communication technology field, includes: the near-end module comprises a synchronization unit and a modulation unit; the remote module comprises a demodulation unit; the synchronization unit is used for obtaining time slot ratio information of the macro station signal and converting the time slot ratio information into upper and lower high and low level information; the modulation unit is used for receiving the level information and modulating and converting the level information into a radio frequency signal; the demodulation unit is used for receiving the radio frequency signal and demodulating an uplink time slot signal and a downlink time slot signal. According to the method and the device, a low-cost modulation unit and a low-cost demodulation unit are adopted to replace part of synchronous work, the near end converts time slot matching information of a macro station signal into level information and sends the level information in a radio frequency information form, the demodulation unit is correspondingly adopted to demodulate the radio frequency signal at the far end to obtain a time slot signal, clock synchronization of a micro distribution system is achieved, under the condition that a control signal of a base station does not need to be analyzed, a hardware link and an algorithm are simplified, and cost is effectively reduced.

Description

Micro-distribution system

Technical Field

The application relates to the technical field of wireless communication, in particular to a micro-distribution system.

Background

The TDD mode, which is currently commonly used in 4G/5G mobile communication, is a mobile communication system in TDD mode in which reception and transmission are performed in different time slots of the same frequency channel (i.e., carrier) and the reception and transmission channels are separated by a guaranteed time. The uplink and downlink use the same frequency band, and the time occupied by the uplink and downlink is generally divided into a plurality of time segments, called time slots, at regular intervals.

In the TDD microdistribution system, clock synchronization becomes a key point. The currently common approach is to install a synchronization module on each device, whether the near end unit or the far end unit, the principle of operation of the synchronization module is as follows: after starting up, a Primary Synchronization Signal (PSS) and a synchronization channel (SSS) are searched to obtain a cell group ID, and then more accurate time and frequency synchronization is carried out. And reading MIB information and SIB information, and obtaining information such as TDD uplink and downlink time slot ratio, special subframe format and the like in the SIB information. By the method, uplink and downlink time slot ratio and special subframe format can be accurately obtained, but the cost is high, and the market requirement is difficult to meet compared with the current low-cost requirement of a micro-distribution system.

SUMMERY OF THE UTILITY MODEL

The main objective of the present application is to provide a micro distribution system, which aims to solve the problem of higher cost of the TDD micro distribution system in the prior art.

The technical scheme adopted by the application is as follows:

a microdistribution system comprising: a signal-connected near-end module and far-end module, wherein:

the near-end module comprises a synchronization unit and a modulation unit which are connected by signals;

the remote module comprises a demodulation unit;

the synchronization unit is used for obtaining time slot ratio information of the macro station signal and converting the time slot ratio information into upper and lower high and low level information;

the modulation unit is used for receiving the level information and modulating and converting the level information into a radio frequency signal;

the demodulation unit is used for receiving the radio frequency signal and demodulating an uplink time slot signal and a downlink time slot signal.

Optionally, the near-end module further includes a near-end device, the near-end device is in signal connection with the synchronization unit, and an uplink and downlink switch of the near-end device is controlled by the uplink and downlink high and low level information.

Optionally, the near-end device is configured to receive the macro station signal and send the macro station signal to the synchronization unit.

Optionally, the micro distribution system further includes a power divider, a main path port of the power divider is electrically connected to the near-end module, and a branch path port of the power divider is electrically connected to the far-end module.

Optionally, the power divider includes a first power divider and a plurality of second power dividers, a main path port of the first power divider is electrically connected to the near-end module, a branch path port of the first power divider is electrically connected to a main path port of one of the second power dividers, and a branch path port of the second power divider is electrically connected to the far-end module.

Optionally, the number of the branch ports of the second power divider is not less than the number of the branch ports of the first power divider.

Optionally, the remote module further includes a remote device, the remote device is in signal connection with the demodulation module, and an uplink switch and a downlink switch of the remote device are controlled by uplink and downlink timeslot signals.

Optionally, the micro distribution system further includes a radio frequency coaxial cable, and the radio frequency coaxial cable is configured to transmit the radio frequency signal modulated and converted by the modulation unit to the demodulation unit.

Optionally, the operating frequency of the radio frequency signal and the operating frequencies of the devices included in the near-end module and the far-end module are located in different frequency bands.

Optionally, the micro distribution system further includes a power adapter, and the power adapter is electrically connected to the modulation unit and the demodulation unit.

Compared with the prior art, the beneficial effect of this application is:

according to the microdistribution system, the time slot ratio of the macro station signal is obtained through the synchronization unit in the near-end module and is converted into the information of upper and lower high and low levels, the information is modulated and converted into the radio frequency signal by the low-cost modulation unit, the radio frequency signal is correspondingly demodulated by the demodulation unit at the far-end module to obtain the time slot signal, the clock synchronization of the microdistribution system is realized, under the condition that the control signal of the base station is not needed to be analyzed, a hardware link and an algorithm are simplified, and the cost is effectively reduced.

Drawings

FIG. 1 is a block diagram of a microdistribution system according to an embodiment of the present application;

fig. 2 is a schematic block diagram of a microdistribution system according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the present embodiment are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and thus, for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

Referring to fig. 1-2, an embodiment of the present application provides a microdistribution system, including a near-end module and a far-end module, where the near-end module is in signal connection with the far-end module, the near-end module includes a synchronization unit and a modulation unit, the synchronization unit is in signal connection with the modulation unit, and the far-end module includes a demodulation unit; the synchronization unit is used for obtaining time slot ratio information of the macro station signal and converting the time slot ratio information into upper and lower high and low level information; the modulation unit is used for receiving the level information and modulating and converting the level information into a radio frequency signal; the demodulation unit is used for receiving the radio frequency signal and demodulating an uplink time slot signal and a downlink time slot signal.

In this embodiment, the near-end module obtains the time slot ratio of the macro station signal through the synchronization unit and converts the time slot ratio into upper and lower high and low level information, the low-cost modulation unit is adopted to modulate and convert the information into a radio frequency signal, and the demodulation unit is correspondingly adopted to demodulate the radio frequency signal at the far-end module to obtain a time slot signal, so that clock synchronization of a micro distribution system is realized, a hardware link and an algorithm are simplified under the condition that a control signal of a base station is not required to be analyzed, and the cost is effectively reduced.

The time slot is the minimum unit of circuit switching summary information transmission, which can be understood as a channel, multiple persons share one resource, and the time-sharing method is adopted for processing, wherein 1 time slot is equivalent to 1 channel, the popular point is a "time interval", and a specific time interval is a time slot. Communication standards specify the form of coded transmission, typically represented by frames, and slots are the constituent units of a frame. In a time division system, different timeslots in a frame may be used to transmit data or signaling for different users, different uplinks and downlinks, and actually constitute a physical channel concept. The timeslot is an important resource, and when a network is deployed, different uplink and downlink timeslot configurations need to be performed in a targeted manner to meet the requirements of each cell family on different services, and the configuration is matched with the requirements of the uplink and downlink services, which is called timeslot matching.

The synchronization unit can adopt an FPGA synchronization module, a wireless synchronization module, a signal analyzer and the like, for example, the FPGA synchronization module is adopted, a TD-LTE baseband synchronization module with Mini PCI specification can be selected, the single power supply voltage of the FPGA synchronization module is DC3.3V +/-10%, the module power consumption is 0.78W when in synchronization AT room temperature, TTL1.8V level is supported, the transmission rate is 115.2Kbps, AT instructions can be received and sent through a serial port, and the synchronization unit is provided with six GPIOs which are respectively effective indication of uplink/downlink time slots, synchronization state indication, 10ms frame synchronization indication and two reserved GPIOs, and corresponding uplink and downlink control signals, such as 0 and 1 control levels, can be generated after the time slot ratio is obtained. If a signal analyzer is adopted, time slot signals can be measured through the GATE function of the signal analyzer, and uplink and downlink time slots and time slot proportion are obtained and then converted into level information.

Modulation is the process of mixing a low energy message signal with a high energy carrier signal to create a new high energy signal that can carry information over great distances. Alternatively, modulation is a process of changing the characteristics (amplitude, frequency, or phase) of a carrier signal according to the amplitude of a message signal, and demodulation is a recovery process corresponding to modulation, and the signal can be used after being demodulated. The modulation and demodulation units employ modems, which are acronyms for modulators and demodulators, that translate a computer's digital signals into analog signals that can be transmitted over ordinary telephone lines, which in turn can be received by another modem at the other end of the line and translated into computer-understandable language, with one modulator and the other demodulator if subdivided. Compared with the existing mode that the synchronous modules are arranged at the near end and the far end, the number of the synchronous modules can be reduced, the cost of the modulation unit is less than one fifth of the cost of the synchronous modules, the cost can be effectively reduced, and the cost is reduced more obviously under the condition that a-N micro-distribution system, especially a system more than 1-4, has a larger number of the far ends.

As shown in fig. 2, the modulation unit and the demodulation unit may be in the same intelligent central control, and the modulation unit and the demodulation unit are equipped with a power adapter for power supply connection to convert an ac input into a DC output, and in the embodiment of the present application, a DC-24V power adapter may be used. Because the modem is directed at the radio frequency signal, a radio frequency coaxial cable can be added to the micro distribution system, as shown in fig. 1, the radio frequency coaxial cable is used for transmitting the radio frequency signal modulated and converted by the modulation unit to the demodulation unit, and has the characteristics of high propagation speed, low attenuation, blocking of external electromagnetic interference, improvement of communication quality and the like. The working frequency of the radio frequency signal and the working frequency of the equipment contained in the near-end module and the far-end module are located in different frequency bands, the two are not interfered with each other and not influenced with each other, and synchronization and actual work can be effectively realized at the same time.

In one embodiment, to implement practical application, the near-end module further includes a near-end device, the near-end device is in signal connection with the synchronization unit, and an uplink and downlink switch of the near-end device is controlled by information of high and low levels of the uplink and the downlink; the remote module also comprises remote equipment, the remote equipment is in signal connection with the demodulation module, and an uplink switch and a downlink switch of the remote equipment are controlled by uplink and downlink time slot signals. The near end and the far end in mobile communication are relative. First, looking at the topology and repeater concept of mobile communication, there are optical fiber repeater and frequency shift repeater, where the optical fiber repeater is connected to the end of the optical fiber, and then is connected to metropolitan area network, transmission network, etc. The frequency shift repeater is used in the uplink path, and the signal of the mobile handset in the coverage area is processed by the uplink amplifying link in the same working mode and then transmitted to the corresponding base station, thereby achieving the signal transmission between the base station and the handset. Is connected to the base station by wireless. Near-end, the part away from the base station, typically in the base room of the base station, the equipment is the near-end unit that is used to couple to the part of the base station signal. And the other end is used at the user end, namely the far end, and the equipment becomes a far-end machine which is used for amplifying the base station signal and accessing the user. Meanwhile, the near-end device may be used as a macro station signal receiving device, configured to receive the macro station signal and send the macro station signal to the synchronization unit.

In one embodiment, the synchronization problem of the micro-distribution system is solved at low cost, the effect of practical application is optimized, the transmitting channel is added, the power divider is added to the micro-distribution system, the main path port of the power divider is electrically connected with the near-end module, and the branch path port of the power divider is electrically connected with the far-end module. The power divider is a device which divides one path of input signal energy into two paths or multiple paths to output equal or unequal energy, and can also combine multiple paths of signal energy into one path to output, at the moment, the power divider can also be called a combiner, a certain isolation degree is ensured between output ports of one power divider, and two power dividers, three power dividers, four power dividers, six power dividers and the like are usually adopted.

In an embodiment, as shown in fig. 2, since more output ports of the power divider are provided, the loss is larger, and to reduce the loss, multi-port output is implemented, the multi-port output may be implemented in a manner of cascading the power dividers. Obviously, the connection effect of the branch ports of the second power divider is better under the condition that the number of the branch ports of the second power divider is not less than that of the branch ports of the first power divider, the final multi-port output is gradually expanded by the two power dividers, the loss of each power divider is smaller, and the stability and effectiveness of transmission are ensured.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A microdistribution system, comprising: a signal-connected near-end module and far-end module, wherein:

the near-end module comprises a synchronization unit and a modulation unit which are in signal connection;

the remote module comprises a demodulation unit;

the synchronization unit is used for acquiring time slot ratio information of a macro station signal and converting the time slot ratio information into upper and lower high and low level information;

2. The microdistribution system according to claim 1, wherein the near end module further comprises a near end device, the near end device is in signal connection with the synchronization unit, and the uplink and downlink switches of the near end device are controlled by the uplink and downlink high and low level information.

3. Micro distribution system according to claim 2, characterized in that the near end device is adapted to receive the macro station signal and send it to the synchronization unit.

4. The micro distribution system of claim 1, further comprising a power divider having a main port electrically connected to the near-end module and a branch port electrically connected to the far-end module.

5. The micro-distribution system of claim 4, wherein the power divider comprises a first power divider and a plurality of second power dividers, a main path port of the first power divider is electrically connected to the near-end module, branch paths of the first power divider are respectively electrically connected to a main path port of one of the second power dividers, and branch paths of the second power divider are electrically connected to the far-end module.

6. The micro distribution system of claim 5, wherein the number of branch ports of the second power divider is not less than the number of branch ports of the first power divider.

7. The microdistribution system according to claim 1, wherein the remote module further comprises a remote device in signal connection with the demodulation unit, the uplink and downlink switch of the remote device being controlled by the uplink and downlink timeslot signal.

8. Micro-distribution system according to claim 1, further comprising a radio frequency coaxial cable for transmitting the radio frequency signal modulated and converted by the modulation unit to the demodulation unit.

9. The microdistribution system of claim 1, wherein the operating frequency of the radio frequency signal is in a different frequency band than the operating frequencies of the devices contained in the near-end module and the far-end module.

10. The micro distribution system of claim 1, further comprising a power adapter electrically connected to the modulation unit and the demodulation unit.