CN113438004A - Digital relay device for high-speed rail car 5G signal coverage - Google Patents
Digital relay device for high-speed rail car 5G signal coverage Download PDFInfo
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- CN113438004A CN113438004A CN202110637709.2A CN202110637709A CN113438004A CN 113438004 A CN113438004 A CN 113438004A CN 202110637709 A CN202110637709 A CN 202110637709A CN 113438004 A CN113438004 A CN 113438004A
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 230000011664 signaling Effects 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000006855 networking Effects 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
- H04B7/15578—Relay station antennae loop interference reduction by gain adjustment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- Computer Networks & Wireless Communication (AREA)
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- Aviation & Aerospace Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
Digital relay device for high-speed railway carriage 5G signal coverage. The invention comprises a digital repeater main unit and a plurality of digital repeater slave units distributed in a carriage, wherein the digital repeater main unit wirelessly receives 5G signals through a roof 2T2R omnidirectional antenna and is connected with each digital repeater slave unit through an Ethernet switch; the digital repeater host unit and the digital repeater slave unit respectively comprise a power supply module, a multimode duplex combiner, a 5G synchronous module and a digital variable-frequency high-power integrated module which are sequentially connected, the 5G synchronous module automatically completes cell search and wireless signaling processing of a TDD-standard wireless network to obtain accurate TDD uplink and downlink time slot timing and uplink and downlink time slot ratio information, and uplink and downlink time slot indication signals are output through a GPIO (general purpose input output) interface. The invention introduces the 5G base station signal outside the carriage into the carriage for covering, thereby effectively avoiding the influence of the vehicle body loss on the communication.
Description
Technical Field
The invention relates to the technical field of 5G communication, in particular to a digital relay device for covering 5G signals of a high-speed railway carriage.
Background
The covering scheme along the railway of the public mobile communication system is generally realized by building a base station and a leaky cable, and penetrating signals into a train carriage to realize in-train covering. However, as the speed of the train is increased and the material of the train body changes, the signal penetration loss is increased, and in order to maintain the coverage quality in the train, the distance between the base stations needs to be further reduced and the transmitting power needs to be improved, which greatly increases the system construction cost and difficulty. Meanwhile, as the 5G system adopts higher frequency, the signal will face more serious penetration loss, so that the 5G signal after penetrating through the train is weaker, and good network coverage is difficult to provide. Therefore, whether the upgrade of the train or the commercial use of 5G, it is necessary to research the boarding scheme of the public mobile communication system to reduce or avoid the serious penetration loss of the train, improve the signal quality in the train, enhance the service providing capability, and reduce the construction difficulty and cost.
Through the comparative analysis of the vehicle body shielding and the unshielded covering distance, the influence of the high-speed rail vehicle body shielding on the covering distance is huge, and the construction cost of an outdoor base station is directly increased.
Compared with a 4G device, the 5G device performs baseband decoding through the received signals, the received SINR can be greatly improved, if the SINR of the receiving end is 6dB, the received SINR can be restored after baseband decoding, the received SINR can reach more than 16dB, and the coverage quality can be greatly improved. Compared with a 4G device, a wireless amplification system is usually a radio frequency combiner, so that the noise of the whole base station is improved. The 5G device can analyze a plurality of remote data in a baseband combining mode, combine useful data through an algorithm, remove background noise and useless stray, and greatly reduce the interference of a plurality of wireless amplification devices on the uplink of the base station.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a digital relay device for covering 5G signals of a high-speed railway carriage, which introduces 5G base station signals outside the carriage into the carriage for covering and effectively avoids the influence of the loss of a vehicle body on communication.
The invention comprises a digital repeater main unit and a plurality of digital repeater slave units distributed in a carriage, wherein the digital repeater main unit wirelessly receives 5G signals through a roof 2T2R omnidirectional antenna and is connected with each digital repeater slave unit through an Ethernet switch; the digital repeater host unit and the digital repeater slave unit respectively comprise a power supply module, and a multimode duplex combiner, a 5G synchronous module and a digital variable-frequency high-power integrated module which are sequentially connected, wherein the multimode duplex combiner of the digital repeater host unit is connected with an antenna, the multimode duplex combiner of the digital repeater slave unit is connected with a transmitting unit, and the digital variable-frequency high-power integrated module of the digital repeater host unit and the digital repeater slave unit are connected through an Ethernet switch; the 5G synchronization module automatically completes cell search and wireless signaling processing of a TDD wireless network to obtain accurate TDD uplink and downlink time slot timing and uplink and downlink time slot ratio information, and outputs uplink and downlink time slot indication signals through a GPIO interface.
Further improved, the 5G synchronization module includes at least one TDD3.5G uplink and downlink channel, TDD2.6G uplink and downlink channel, and FDD1.8G uplink and downlink channel.
The digital frequency conversion high-power integrated module is an integrated module integrating a frequency conversion processing module and a power amplification module, supports multi-band, multi-standard, multi-channel and digital frequency conversion processing functions and has a high-power amplification function.
The multi-mode duplex combiner is a medium module integrating the combiner, the filter and the duplexer.
The digital repeater host unit is further improved, the digital repeater host unit is provided with an input power detection module, when the input power is more than or equal to-50 dBm, the 5G synchronization module dynamically adjusts the downlink gain of the repeater, the downlink gain can be reduced by more than 30dB, and the wireless signal interference of an internal public network and an external public network of a carriage is avoided.
In a further improvement, the power module has a redundant backup.
The invention has the beneficial effects that:
1. and by utilizing relay forwarding, the 5G base station signal outside the carriage is introduced into the carriage to be covered, so that the influence of the vehicle body loss on communication is effectively avoided.
2. The method can analyze a plurality of remote data, remove background noise and useless stray by combining useful data through an algorithm, greatly reduce the interference of a plurality of wireless amplification devices on the uplink of the base station, and improve the SINR.
3. The downlink gain of the repeater can be dynamically adjusted, over 30dB can be reduced, and the wireless signal interference of the public network inside and outside the carriage can be avoided.
4. The direct mounting on the train has solved the influence of high-speed railway car body shielding to basic station coverage distance, reduces the quantity of railway line basic station, and extremely reduce capital construction and equipment investment cost strengthens communication quality in the car greatly, improves user's demand.
Drawings
Fig. 1 is a high-speed railway car 5G digital relay device overlay network structure.
Fig. 2 shows a digital relay system configuration of a high-speed railway car 5G.
Fig. 3 shows a 5G digital relay coverage networking mode of 8-section marshalling high-speed rail cars.
Fig. 4 shows a 17-section marshalling high-speed railway carriage 5G digital relay coverage networking mode.
Detailed Description
The invention will be further explained with reference to the drawings.
Because the train carriage is generally made of a totally enclosed aluminum alloy stainless steel material, 5G radio waves pass through the carriage to generate serious penetration loss. And thus cannot provide high-speed stable broadband access to end users.
In order to solve the problem, a public network signal access scheme of wireless relay forwarding is provided, and 5G base station signals outside a carriage are introduced into the carriage for covering by utilizing relay forwarding, so that the influence of vehicle body loss on communication is effectively avoided.
The invention comprises a digital repeater main unit and a plurality of digital repeater slave units distributed in a carriage, wherein the digital repeater main unit wirelessly receives 5G signals through a roof 2T2R omnidirectional antenna and is connected with each digital repeater slave unit through an Ethernet switch; the digital repeater host unit and the digital repeater slave unit respectively comprise a power supply module, and a multimode duplex combiner, a 5G synchronous module and a digital variable-frequency high-power integrated module which are sequentially connected, wherein the multimode duplex combiner of the digital repeater host unit is connected with an antenna, the multimode duplex combiner of the digital repeater slave unit is connected with a transmitting unit, and the digital variable-frequency high-power integrated module of the digital repeater host unit and the digital repeater slave unit are connected through an Ethernet switch; the 5G synchronization module automatically completes cell search and wireless signaling processing of a TDD wireless network to obtain accurate TDD uplink and downlink time slot timing and uplink and downlink time slot ratio information, and outputs uplink and downlink time slot indication signals through a GPIO interface.
The specific embodiment of the invention is as follows:
the high-speed rail car digital repeater system integrates four systems of 5G (China Mobile, China telecom, China Unicom, China radio and television) and the like. The digital relay system is composed of a master receiving unit (MU) and a slave transmitting unit (pRU). 5G signals are wirelessly accessed through a car roof 2T2R omnidirectional antenna, multi-system duplex combining is carried out at a receiving unit, the signals are subjected to digital processing for many times and transmitted (Ethernet) to a plurality of covered remote transmitting units through CPRI, and omnibearing covering is realized through a car directional antenna. If the limitation of resources and space is not considered, the carriage 5G digital repeater system can adopt a double-relay scheme, wherein one set of the double-relay scheme has faults and does not influence signal coverage, and the specific composition is shown in figure 1.
5G digital relay device
The MU host unit wirelessly couples downlink radio frequency signals of multiple information sources into a digital distribution system, converts the downlink radio frequency signals into digital signals, performs framing, and transmits the digital signals to the pRU radio frequency unit through a network cable. Meanwhile, the electrical signal uploaded by the pRU radio frequency unit is converted into a digital signal, then is deframed, and is converted into an uplink radio frequency signal to be transmitted to the information source. pRU the remote unit converts the digital signal or analog intermediate frequency signal sent by the MU unit into radio frequency signal to realize wireless coverage of multiple information sources; meanwhile, the received uplink radio frequency signal is converted into a digital signal or an analog intermediate frequency signal and transmitted to the MU unit, and the specific composition is as shown in fig. 2.
Harmonious high-speed railway carriage 5G digital relay coverage
Arranging a set of 5G multi-mode MU units in the 5 th carriage, wherein the 5G multi-mode MU units are provided with two radio frequency input ports; and pRU are independently accessed through a multi-heel 10G network port.
pRU support the 5G mainstream frequency band and transmit through a built-in 2T2R antenna.
The carriage covering system mainly comprises chain type networking, 1 carriage pRU is arranged on each carriage, two chain types are arranged, one chain belt 3 is pRU, and the other chain belt 5 is pRU.
The MU unit is designed according to a 2U structure, pRU is designed according to a space size not exceeding 1U, and the power consumption of each pRU unit is not exceeding 50W.
According to the calculation of the bandwidth of 100MHz and the bandwidth of 30MHz of broadcasting and television of three operators of 5G, not less than 3 10G network cable accesses pRU need to be provided, and the concrete composition is shown in FIG. 3.
5G digital relay cover for Xingxing high-speed railway carriage
Arranging a set of 5G multi-mode MU units in the 9 th carriage, wherein the two sets of MU units are provided with two radio frequency input ports; and pRU are independently accessed through a multi-heel 10G network port.
pRU support the 5G mainstream frequency band and transmit through a built-in 2T2R antenna.
The carriage covering system mainly comprises chain type networking, 1 carriage pRU is arranged on each carriage, two chain types are arranged, one chain belt 9 is pRU, and the other chain belt 8 is pRU.
The MU unit is designed according to a 2U structure, pRU is designed according to a space size not exceeding 1U, and the power consumption of each pRU unit is not exceeding 50W.
According to the calculation of the bandwidth of 100MHz and the bandwidth of 30MHz of broadcasting and television of three operators of 5G, not less than 3 10G network cable accesses pRU need to be provided, and the concrete composition is shown in FIG. 4.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (6)
1. A digital repeater for high-speed railway car 5G signal coverage, characterized by: the digital repeater comprises a digital repeater main unit and a plurality of digital repeater slave units distributed in a carriage, wherein the digital repeater main unit wirelessly receives a 5G signal through a roof 2T2R omnidirectional antenna and is connected with each digital repeater slave unit through an Ethernet switch; the digital repeater host unit and the digital repeater slave unit respectively comprise a power supply module, and a multimode duplex combiner, a 5G synchronous module and a digital variable-frequency high-power integrated module which are sequentially connected, wherein the multimode duplex combiner of the digital repeater host unit is connected with an antenna, the multimode duplex combiner of the digital repeater slave unit is connected with a transmitting unit, and the digital variable-frequency high-power integrated module of the digital repeater host unit and the digital repeater slave unit are connected through an Ethernet switch; the 5G synchronization module automatically completes cell search and wireless signaling processing of a TDD wireless network to obtain accurate TDD uplink and downlink time slot timing and uplink and downlink time slot ratio information, and outputs uplink and downlink time slot indication signals through a GPIO interface.
2. The digital repeater device for high-speed railway car 5G signal coverage according to claim 1, wherein: the 5G synchronization module comprises at least one TDD3.5G uplink and downlink channel, TDD2.6G uplink and downlink channel and FDD1.8G uplink and downlink channel.
3. The digital repeater device for high-speed railway car 5G signal coverage according to claim 1, wherein: the digital frequency conversion high-power integrated module is an integrated module integrating a frequency conversion processing module and a power amplification module, supports multi-band, multi-system, multi-channel and digital frequency conversion processing functions and has a high-power amplification function.
4. The digital repeater device for high-speed railway car 5G signal coverage according to claim 1, wherein: the multi-mode duplex combiner is a medium module integrating a combiner, a filter and a duplexer.
5. The digital repeater device for high-speed railway car 5G signal coverage according to claim 1, wherein: the digital repeater host unit is provided with an input power detection module, and when the input power is more than or equal to-50 dBm, the 5G synchronization module dynamically adjusts the downlink gain of the repeater.
6. The digital repeater device for high-speed railway car 5G signal coverage according to claim 1, wherein: the power module has a redundant backup.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110637709.2A CN113438004A (en) | 2021-06-08 | 2021-06-08 | Digital relay device for high-speed rail car 5G signal coverage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110637709.2A CN113438004A (en) | 2021-06-08 | 2021-06-08 | Digital relay device for high-speed rail car 5G signal coverage |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211830769U (en) * | 2020-05-18 | 2020-10-30 | 厦门南邮信达通信科技有限公司 | 5G frequency conversion light distribution system |
| CN111866899A (en) * | 2020-06-28 | 2020-10-30 | 四川省大见通信技术有限公司 | Indoor microdistribution system and method for 5G mobile communication |
| CN112839318A (en) * | 2021-01-11 | 2021-05-25 | 广东省电信规划设计院有限公司 | High-speed rail 5G coverage system, system simulation method and device and computer equipment |
| CN215773118U (en) * | 2021-06-08 | 2022-02-08 | 南京泰通科技股份有限公司 | Digital relay device for high-speed rail car 5G signal coverage |
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- 2021-06-08 CN CN202110637709.2A patent/CN113438004A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211830769U (en) * | 2020-05-18 | 2020-10-30 | 厦门南邮信达通信科技有限公司 | 5G frequency conversion light distribution system |
| CN111866899A (en) * | 2020-06-28 | 2020-10-30 | 四川省大见通信技术有限公司 | Indoor microdistribution system and method for 5G mobile communication |
| CN112839318A (en) * | 2021-01-11 | 2021-05-25 | 广东省电信规划设计院有限公司 | High-speed rail 5G coverage system, system simulation method and device and computer equipment |
| CN215773118U (en) * | 2021-06-08 | 2022-02-08 | 南京泰通科技股份有限公司 | Digital relay device for high-speed rail car 5G signal coverage |
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