CN113141586A - Communication system and method for comprehensive pipe gallery - Google Patents
Communication system and method for comprehensive pipe gallery Download PDFInfo
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- CN113141586A CN113141586A CN202110400084.8A CN202110400084A CN113141586A CN 113141586 A CN113141586 A CN 113141586A CN 202110400084 A CN202110400084 A CN 202110400084A CN 113141586 A CN113141586 A CN 113141586A
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- wireless
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- handheld terminal
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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
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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
- H04W16/18—Network planning tools
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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
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Abstract
The invention relates to a communication system and a method of a comprehensive pipe gallery, which are characterized by comprising a wireless coverage system, an access terminal and a handheld terminal, wherein the wireless coverage system comprises wireless AP (access point) equipment, a directional antenna, a server and a wireless controller; the wireless AP equipment and the directional antenna are arranged in the comprehensive pipe rack at intervals; the wireless AP equipment is used for providing wireless signal coverage in the comprehensive pipe rack; the directional antenna is used for increasing the wireless signal intensity in the comprehensive pipe rack; the access terminal is used for making the wireless AP equipment networks intercommunicate; the server is used for forwarding the signaling of a certain handheld terminal to the corresponding other handheld terminal or the monitoring center; the handheld terminal is used for sending a signaling of the handheld terminal or the monitoring center needing communication to the server and switching on or hanging up the communication of the other handheld terminal or the monitoring center according to the signaling forwarded by the server.
Description
Technical Field
The invention relates to a video communication system and a video communication method, in particular to a communication system and a communication method for a comprehensive pipe rack, and belongs to the field of underground pipe rack communication.
Background
Tunnel spaces are generally constructed in underground pipe galleries of urban roads, and are used for integrating various pipelines such as power, cables, communication, water supply, heating power, gas and the like, and the pipelines are generally classified so as to be respectively accommodated into different cabins, such as a water communication cabin, an electric power cabin, a heating power cabin and the like. Because the special environment structure of utility tunnel also puts forward higher ground requirement to personnel's communication in it, at present, because do not have public network in the utility tunnel to cover, the intercommunication between the personnel in the utility tunnel or between the personnel in the utility tunnel and the personnel of control center relies on fixed phone or intercom to realize.
However, the distribution density of the fixed telephones is generally large, so that the fixed telephones cannot be effectively and conveniently communicated with other users, cannot accurately position the positions of personnel in the underground pipe gallery, and cannot ensure the timeliness and effectiveness of communication; the intercom coverage area is less, and the signal penetration is weak, can't cover whole underground pipe gallery. In addition, only voice communication can be carried out by using the fixed telephone and the interphone for communication, real-time video communication cannot be realized, and the current situation in the underground pipe gallery cannot be visually displayed for the problems of more field devices, dark environment and the like which are difficult to describe.
Disclosure of Invention
In view of the above problems, the present invention provides a communication system and method for a utility tunnel, which can ensure the timeliness and effectiveness of communication.
In order to achieve the purpose, the invention adopts the following technical scheme: a communication system of a comprehensive pipe gallery comprises a wireless coverage system, an access terminal and a handheld terminal, wherein the wireless coverage system comprises wireless AP equipment, a directional antenna, a server and a wireless controller;
the wireless AP equipment and the directional antenna are arranged in the comprehensive pipe rack at intervals, the wireless AP equipment is used for providing wireless signal coverage in the comprehensive pipe rack, and the directional antenna is used for increasing the wireless signal intensity in the comprehensive pipe rack;
the access terminal is used for making the wireless AP equipment networks intercommunicate;
the server is used for forwarding the signaling of one handheld terminal to the corresponding other handheld terminal or the monitoring center;
the handheld terminal is used for sending a signaling of the handheld terminal or the monitoring center needing to be communicated to the server, and connecting or hanging up the communication of the other handheld terminal or the monitoring center according to the signaling forwarded by the server;
the wireless controller is configured to configure parameters of each of the wireless AP devices.
Furthermore, a data processing module and a signaling forwarding module are arranged in the server;
the data processing module is used for pre-storing account numbers of the handheld terminals and the monitoring center;
the signaling forwarding module is used for sending a signaling to a corresponding handheld terminal or a monitoring center according to the signaling sent by the handheld terminal to a certain account and a pre-stored account.
Furthermore, each handheld terminal is internally provided with a data storage module, a signaling receiving and sending module and an operation interface;
the data storage module is used for pre-storing a communication account list;
the signaling receiving and sending module is used for selecting an account needing to be communicated in a communication account list through the operation interface based on a wireless signal network, sending a signaling to the server and receiving a signaling of another handheld terminal forwarded by the server.
Further, the access terminal comprises a core switch and a mezzanine switch;
the core switch is arranged outside the comprehensive pipe rack, and a plurality of interlayer switches are arranged in an internal interlayer of the comprehensive pipe rack at intervals;
the core switch is respectively connected with the server, the wireless controller and each interlayer switch, and each interlayer switch is also respectively connected with a plurality of corresponding wireless AP devices.
Further, every interval is all provided with one in the utility tunnel wireless AP equipment and two directional antenna.
Further, the distance between the two wireless AP devices is 50 m.
Further, the access terminal employs a switch.
A method of communicating with a utility tunnel, comprising:
1) a plurality of wireless AP devices and directional antennas are arranged in a comprehensive pipe rack at intervals, and an access terminal is respectively connected with a server, a wireless controller and each wireless AP device to complete same-frequency networking deployment of a wireless network. (ii) a
2) Connecting each handheld terminal in the comprehensive pipe rack with a wireless network of the comprehensive pipe rack;
3) the method comprises the steps that a handheld terminal and a monitoring center of each person in a comprehensive pipe gallery are configured with an account, and all accounts are stored in each handheld terminal;
4) when personnel in the comprehensive pipe gallery need to communicate or communicate with the monitoring center, the handheld terminal sends a signaling of an account number needing to communicate to the server, the server forwards the signaling to the corresponding handheld terminal or the monitoring center, and the handheld terminal or the monitoring center selects to connect or hang up the communication.
Further, step 1) in with the fixed setting of core switch outside utility tunnel, set up a plurality of intermediate layer switch intervals in the inside intermediate layer of utility tunnel, connect server, wireless controller and each intermediate layer switch respectively with the core switch to connect a plurality of wireless AP equipment that correspond respectively with each intermediate layer switch.
Further, the specific process of the step 4) is as follows:
4.1) when communication is needed among personnel in the comprehensive pipe gallery or communication is needed with a monitoring center, selecting an account needing communication in a communication account list through an operation interface, and sending a signaling to a server to request communication connection;
4.2) the server forwards the signaling to a corresponding handheld terminal or a monitoring center needing communication according to a pre-stored account;
and 4.3) after the handheld terminal or the monitoring center needing communication receives the signaling, the communication is selected to be connected or hung up through the operation interface.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. according to the invention, as the plurality of wireless AP equipment and the directional antenna are arranged in the comprehensive pipe rack at intervals, the coverage range is wide, and the communication can be carried out in the whole comprehensive pipe rack.
2. According to the invention, the local area network covers the inside of the whole comprehensive pipe gallery through the wireless AP equipment, personnel in the comprehensive pipe gallery can communicate in a point-to-point communication mode through the handheld terminal at any time, the timeliness and the communication efficiency are high, and the wireless AP equipment can be widely applied to the field of underground pipe gallery communication.
Drawings
FIG. 1 is a schematic structural diagram provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a wireless access point location configuration according to an embodiment of the invention;
fig. 3 is a schematic diagram of a communication principle of the handheld terminal in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "upper", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
Due to the particularity of the comprehensive pipe gallery, in order to guarantee the operation safety of the comprehensive pipe gallery, no public network coverage is arranged in all the comprehensive pipe galleries, and existing communication software cannot be used in the comprehensive pipe gallery.
Example 1
As shown in fig. 1 and fig. 2, the communication system of the utility tunnel provided by the present invention comprises a wireless coverage system 1, an access terminal 2 and a handheld terminal, wherein the wireless coverage system 1 comprises a wireless AP (wireless access point) device 11, a directional antenna 12, a server 13 and a wireless controller 14.
A wireless AP device 11 and two directional antennas 12 are disposed at a distance (e.g., 50m) from each other in the utility tunnel 3.
The wireless AP device 11 is used to provide wireless signal network coverage within the utility tunnel 3.
The directional antenna 12 is used to increase the wireless signal strength within the utility tunnel 3.
The access terminal 2 is respectively connected with the server 13, the wireless controller 14 and each wireless AP device 11, and the server 13 is also respectively connected with the handheld terminal in the utility tunnel 3 and the monitoring center outside the utility tunnel 3.
The access terminal 2 is configured to make each wireless AP device 11 have a condition for network interworking.
The server 13 is used for forwarding the signaling of the monitoring center or a certain handheld terminal to the corresponding other handheld terminal or monitoring center.
The handheld terminal is used for sending a signaling of the handheld terminal or the monitoring center needing communication to the server 13 and connecting or hanging up the communication of another handheld terminal according to the signaling forwarded by the server 13, wherein the communication comprises video communication or voice communication.
The wireless controller 14 is configured to configure parameters of each wireless AP device 11, including an ip address, a mac address, signal strength, and a network access mode.
In a preferred embodiment, a data processing module and a signaling forwarding module are arranged in the server 13.
And the data processing module is used for pre-storing the account numbers of the handheld terminals and the monitoring center.
The signaling forwarding module is used for sending the signaling to a corresponding handheld terminal or a monitoring center according to the signaling sent by the handheld terminal to a certain account and the account stored in advance.
In a preferred embodiment, each handheld terminal is internally provided with a data storage module, a signaling receiving and sending module and an operation interface.
The data storage module is used for pre-storing a communication account list, wherein the communication list comprises users needing to communicate and a monitoring center.
The signaling receiving and sending module is used for selecting an account needing to be communicated in a communication account list through an operation interface based on a wireless signal network, sending a signaling to the server 13 by adopting a signaling sending mode of WebRtc, and receiving the signaling of another handheld terminal or a monitoring center forwarded by the server 13, wherein the signaling comprises connection, hang-up and the like.
In a preferred embodiment, access terminal 2 includes a core switch 21 and a mezzanine switch 22. The core switch 21 sets up the surveillance center outside utility tunnel 3, and the interval is provided with a plurality of intermediate layer switches 22 in the inside intermediate layer of utility tunnel 3, and server 13, wireless controller 14 and each intermediate layer switch 22 are connected respectively to core switch 21, and each intermediate layer switch 22 still connects a plurality of corresponding wireless AP equipment 11 and other network equipment respectively, for example video monitoring equipment etc..
Example 2
As shown in fig. 3, the present embodiment provides a communication method for a utility tunnel, including the following steps:
1) every interval 50m sets up a wireless AP equipment 11 and two directional aerial 12 in utility tunnel 3, with the fixed setting of core switch 21 outside utility tunnel 3, set up a plurality of intermediate layer switch 22 intervals in the inside intermediate layer of utility tunnel 3, connect server 13, wireless controller 14 and each intermediate layer switch 22 respectively with core switch 21 to connect a plurality of wireless AP equipment 11 that correspond respectively with each intermediate layer switch 22, accomplish the deployment of wireless network same frequency network deployment.
2) Each handheld terminal in utility tunnel 3 is connected with the wireless network of utility tunnel 3.
3) An account is configured for the handheld terminal and the monitoring center of each person in the comprehensive pipe gallery 3, and all accounts, namely a communication account list, are stored in the data storage module of each handheld terminal.
4) When communication is needed among the personnel in the comprehensive pipe gallery 3 or communication is needed with the monitoring center, the account needing communication is selected from the communication account list through the operation interface, and signaling is sent to the server 13 to request communication connection.
5) The server 13 forwards the signaling to the corresponding handheld terminal or monitoring center needing communication according to the account number stored in advance.
6) After the user or the monitoring center needing to communicate receives the signaling, the communication is selected to be connected or hung up through the operation interface.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. The communication system of the comprehensive pipe rack is characterized by comprising a wireless coverage system, an access terminal and a handheld terminal, wherein the wireless coverage system comprises a wireless AP device, a directional antenna, a server and a wireless controller;
the wireless AP equipment and the directional antenna are arranged in the comprehensive pipe rack at intervals, the wireless AP equipment is used for providing wireless signal coverage in the comprehensive pipe rack, and the directional antenna is used for increasing the wireless signal intensity in the comprehensive pipe rack;
the access terminal is used for making the wireless AP equipment networks intercommunicate;
the server is used for forwarding the signaling of one handheld terminal to the corresponding other handheld terminal or the monitoring center;
the handheld terminal is used for sending a signaling of the handheld terminal or the monitoring center needing to be communicated to the server, and connecting or hanging up the communication of the other handheld terminal or the monitoring center according to the signaling forwarded by the server;
the wireless controller is configured to configure parameters of each of the wireless AP devices.
2. The communication system of a utility tunnel according to claim 1, wherein a data processing module and a signaling forwarding module are provided in said server;
the data processing module is used for pre-storing account numbers of the handheld terminals and the monitoring center;
the signaling forwarding module is used for sending a signaling to a corresponding handheld terminal or a monitoring center according to the signaling sent by the handheld terminal to a certain account and a pre-stored account.
3. The communication system of the utility tunnel according to claim 1, wherein each of the handheld terminals is provided with a data storage module, a signaling module and an operation interface;
the data storage module is used for pre-storing a communication account list;
the signaling receiving and sending module is used for selecting an account needing to be communicated in a communication account list through the operation interface based on a wireless signal network, sending a signaling to the server and receiving a signaling of another handheld terminal forwarded by the server.
4. The utility tunnel communication system of claim 1, wherein the access terminals include a core switch and a mezzanine switch;
the core switch is arranged outside the comprehensive pipe rack, and a plurality of interlayer switches are arranged in an internal interlayer of the comprehensive pipe rack at intervals;
the core switch is respectively connected with the server, the wireless controller and each interlayer switch, and each interlayer switch is also respectively connected with a plurality of corresponding wireless AP devices.
5. The utility tunnel communication system of claim 1, wherein one said wireless AP device and two said directional antennas are located at a distance from each other within the utility tunnel.
6. A utility corridor's communication system according to claim 5, characterized in that the distance between two said wireless AP devices is 50 m.
7. A utility corridor's communication system as claimed in claim 1, characterized in that the access terminal employs a switch.
8. A communication method of a comprehensive pipe rack is characterized by comprising the following steps:
1) arranging a plurality of wireless AP (access point) devices and directional antennas in a comprehensive pipe rack at intervals, and connecting an access terminal with a server, a wireless controller and each wireless AP device respectively to complete same-frequency networking deployment of a wireless network;
2) connecting each handheld terminal in the comprehensive pipe rack with a wireless network of the comprehensive pipe rack;
3) the method comprises the steps that a handheld terminal and a monitoring center of each person in a comprehensive pipe gallery are configured with an account, and all accounts are stored in each handheld terminal;
4) when personnel in the comprehensive pipe gallery need to communicate or communicate with the monitoring center, the handheld terminal sends a signaling of an account number needing to communicate to the server, the server forwards the signaling to the corresponding handheld terminal or the monitoring center, and the handheld terminal or the monitoring center selects to connect or hang up the communication.
9. The communication method of the utility tunnel according to claim 8, wherein in step 1), the core switch is fixedly arranged outside the utility tunnel, a plurality of interlayer switches are arranged in the internal interlayer of the utility tunnel at intervals, the core switch is respectively connected with the server, the wireless controller and each interlayer switch, and each interlayer switch is respectively connected with a plurality of corresponding wireless AP devices.
10. The communication method for the comprehensive pipe rack according to claim 8, wherein the specific process of the step 4) is as follows:
4.1) when communication is needed among personnel in the comprehensive pipe gallery or communication is needed with a monitoring center, selecting an account needing communication in a communication account list through an operation interface, and sending a signaling to a server to request communication connection;
4.2) the server forwards the signaling to a corresponding handheld terminal or a monitoring center needing communication according to a pre-stored account;
and 4.3) after the handheld terminal or the monitoring center needing communication receives the signaling, the communication is selected to be connected or hung up through the operation interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110400084.8A CN113141586B (en) | 2021-04-14 | 2021-04-14 | Communication system and method of comprehensive pipe rack |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110400084.8A CN113141586B (en) | 2021-04-14 | 2021-04-14 | Communication system and method of comprehensive pipe rack |
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| CN113141586A true CN113141586A (en) | 2021-07-20 |
| CN113141586B CN113141586B (en) | 2023-01-13 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040196810A1 (en) * | 2003-02-12 | 2004-10-07 | Tae-Young Kil | Complex wireless service apparatus using wired and wireless communication systems and method thereof |
| CN107483229A (en) * | 2017-07-20 | 2017-12-15 | 中国三冶集团有限公司 | City integrated piping lane operation management system |
| CN209234072U (en) * | 2019-01-17 | 2019-08-09 | 中铁十七局集团电气化工程有限公司 | Pipe gallery WIFI positioning system |
| CN110166569A (en) * | 2019-06-04 | 2019-08-23 | 亿雅捷交通系统(北京)有限公司 | A kind of pipe gallery converged communication system and method |
| CN210112054U (en) * | 2019-03-12 | 2020-02-21 | 上海电器科学研究所（集团）有限公司 | Utility tunnel security protection communication integration system based on wisdom line |
| CN112422622A (en) * | 2020-09-29 | 2021-02-26 | 四川九门科技股份有限公司 | Comprehensive management system and method for intelligent pipe gallery pipelines applied to chemical industry park |
-
2021
- 2021-04-14 CN CN202110400084.8A patent/CN113141586B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040196810A1 (en) * | 2003-02-12 | 2004-10-07 | Tae-Young Kil | Complex wireless service apparatus using wired and wireless communication systems and method thereof |
| CN107483229A (en) * | 2017-07-20 | 2017-12-15 | 中国三冶集团有限公司 | City integrated piping lane operation management system |
| CN209234072U (en) * | 2019-01-17 | 2019-08-09 | 中铁十七局集团电气化工程有限公司 | Pipe gallery WIFI positioning system |
| CN210112054U (en) * | 2019-03-12 | 2020-02-21 | 上海电器科学研究所（集团）有限公司 | Utility tunnel security protection communication integration system based on wisdom line |
| CN110166569A (en) * | 2019-06-04 | 2019-08-23 | 亿雅捷交通系统(北京)有限公司 | A kind of pipe gallery converged communication system and method |
| CN112422622A (en) * | 2020-09-29 | 2021-02-26 | 四川九门科技股份有限公司 | Comprehensive management system and method for intelligent pipe gallery pipelines applied to chemical industry park |
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| CN113141586B (en) | 2023-01-13 |
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