A dual-channel wireless and wired communication system and method

Abstract

The present invention discloses a dual-channel wireless and wired communication system and method, which relates to the field of communication technology, specifically a mobile terminal, a first relay point, a second relay point and a fixed terminal; a physical network card group (including two physical network cards) and two wireless bridges are arranged in the mobile terminal, and the physical network card group in the mobile terminal is connected to the wireless bridge in the mobile terminal through a wired transmission medium; the first relay point and the second relay point are provided with two independent wireless bridges, which are respectively connected to the two wireless bridges arranged in the mobile terminal in the form of electromagnetic waves; a physical network card group (including two physical network cards) is arranged in the fixed terminal, and the physical network card group in the fixed terminal is connected to the wireless bridges in the first relay point and the second relay point through a wired transmission medium. This solution adopts a wireless communication method between a mobile large-scale device and a fixed relay point, and does not adopt a communication cable turntable and a control cable, which can reduce the cost and failure rate of the communication system.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a two-way wireless and wired communication system and method. Background Art

[0002] At the freight terminal, port mobile equipment (ship unloaders, stackers, ship loaders, etc.) and ground fixed terminals need to communicate two-way. The communication signals include digital quantities (such as interlocking signals, emergency stop signals, etc.) and analog quantities (such as instantaneous flow of stackers, operating tonnage, real-time position coordinates of ship unloaders, etc.); these signals, especially interlocking signals and emergency stop signals, have extremely high communication requirements. If the signal is interrupted, it may cause serious equipment damage, casualties and other consequences.

[0003] There are two communication modes between existing port mobile equipment and fixed terminals:

[0004] Wired communication: A communication cable is laid in the junction box between the fixed end and the large mobile end track foundation, connecting the fixed end electrical equipment and the middle junction box. A cable turntable is installed under the large machinery, on which a communication cable is coiled. One end of the communication cable is connected to the middle junction box, and the other end is connected to the communication cable turntable junction box. When the large machinery is moving, the communication cable turntable is folded up or down, and the length changes as the distance between the single machine and the middle junction box changes. A control cable is laid on the large machinery, one end of which is connected to the cable turntable junction box, and the other end is connected to the electrical equipment in the electrical room; the entire system establishes wired communication between the fixed end and the large equipment.

[0005] However, this method requires the configuration of communication cables and cable turntables, and the total cost is approximately at least 140,000 yuan, which is expensive. In addition, due to the harsh environment of bulk cargo terminals, cables are often damaged, and cable turntable failures also occur from time to time, requiring frequent maintenance and even replacement of parts and cables. Therefore, some port machinery has been transformed into wireless communication systems.

[0006] Wireless communication: Use wireless transmission / reception equipment (such as data transmission radio, wireless bridge, etc.) to communicate. Install a pair of wireless transmission and reception equipment on large machinery and fixed ends to communicate through electromagnetic wave media.

[0007] However, this method has the defect of unreliable transmission in actual use. Since large-scale dock machinery is often moved, the communication between a large-scale machinery and the central control is often blocked by other machinery. In addition, electromagnetic interference inside and outside the port area often causes wireless communication interruptions. Therefore, a 3 to 8 second delay has to be added to the PLC program to "solve" the communication interruption problem. Summary of the invention

[0008] The first object of the present invention is to provide a dual-channel wireless and wired communication system to solve the defect that the wireless communication system is easily interrupted.

[0009] The second object of the present invention is to provide the above-mentioned two-way wireless and wired communication method.

[0010] In order to achieve the first object of the present invention, the following technical scheme is adopted:

[0011] A two-way wireless and wired communication system includes a mobile terminal, a first relay point, a second relay point and a fixed terminal;

[0012] The mobile terminal walks along a track or a fixed route; the mobile terminal and at least one of the first relay point and the second relay point remain clear on the shortest path at any time;

[0013] The mobile terminal is provided with a physical network card group (composed of two physical network cards) and two wireless network bridges, and the physical network card group in the mobile terminal is connected to the wireless network bridge in the mobile terminal through a wired transmission medium (twisted pair or optical fiber);

[0014] The first relay point and the second relay point are independently connected via a built-in wireless bridge and a wireless bridge set in the mobile terminal in the form of electromagnetic waves;

[0015] A physical network card group (composed of two physical network cards) is provided in the fixed end, and the physical network card group in the fixed end is connected to the wireless bridges in the first relay point and the second relay point through a wired transmission medium;

[0016] The mobile terminal, the first relay point and the fixed terminal form a first channel through wired connection and wireless connection; the mobile terminal, the second relay point and the fixed terminal form a second channel through wired connection and wireless connection; the first channel and the second channel form a logical path through network card binding and / or link aggregation.

[0017] Furthermore, the physical network card group provided in the mobile terminal forms a first logical network card through network card binding and / or link aggregation;

[0018] The physical network card group arranged in the fixed end forms a second logical network card through network card binding and / or link aggregation.

[0019] Furthermore, both the fixed end and the mobile end are provided with an industrial computer with multiple network ports.

[0020] A communication PLC is arranged outside the multi-network port industrial computer.

[0021] The physical network card group and the physical network card of the fixed end and the mobile end are arranged in a multi-network port industrial computer, and the physical network card in the multi-network port industrial computer is connected to the communication PLC by wire.

[0022] In order to achieve the second object of the present invention, the following technical scheme is adopted:

[0023] A two-way wireless and wired communication method includes a mobile terminal, a first relay point, a second relay point and a fixed terminal;

[0024] A physical network card is provided in the mobile terminal, and the physical network card forms a first physical channel with a communication PLC built into the mobile terminal; and each network card of the physical network card group is independently connected with two wireless bridges built into the mobile terminal by wired connection to form a third physical channel and a fourth physical channel;

[0025] A physical network card is arranged in the fixed end, and the physical network card forms a second physical channel with the communication PLC built into the fixed end; and each network card of the physical network card group is independently connected with the wireless network bridge arranged in the first relay point and the wireless network bridge in the second relay point by wired connection to form a fifth physical channel and a sixth physical channel respectively;

[0026] The first wireless network bridge built into the mobile terminal and the second wireless network bridge built into the first relay point are connected in a manner of electromagnetic waves to form a seventh physical channel;

[0027] The third wireless network bridge built into the mobile terminal and the fourth wireless network bridge built into the second relay point are connected in a manner of electromagnetic waves to form an eighth physical channel;

[0028] The third physical channel, the seventh physical channel, and the fifth physical channel are bridged by the first wireless bridge and the second wireless bridge to form a ninth physical channel;

[0029] The fourth physical channel, the eighth physical channel, and the sixth physical channel are bridged by the third wireless bridge and the fourth wireless bridge to form a tenth physical channel;

[0030] The first logical network card, the ninth physical channel, the tenth physical channel, and the second logical network card form a first logical channel;

[0031] The first physical channel, the first logical channel, and the second physical channel, after being bridged by the first industrial computer and the second industrial computer, form a second logical / physical channel to establish a complete communication channel between the first communication PLC and the second communication PLC.

[0032] Furthermore, this patent only provides a two-way wireless and wired communication method, but it can be easily expanded to a multi-way (three-way, four-way...) wireless and wired communication method. It only requires adding relay points, adding wireless bridges, adding wired transmission media, adding physical network cards to multi-port industrial computers, and modifying necessary parameter configurations.

[0033] The present invention has the following advantages:

[0034] (1) This solution uses wireless communication between mobile large equipment and relay points, and does not use communication cable turntables and control cables, which can reduce the cost of the communication system.

[0035] (2) Not using communication cables can reduce damage to the cables caused by harsh environments and other objects, thereby reducing the failure rate.

[0036] (3) Since the mobile device and the relay point are completely visible, the wireless communication between the mobile large machinery and the fixed relay point is not interrupted by obstacles. Wired communication is used between the relay point and the fixed end, ensuring the reliability of the communication system between the relay and the fixed end.

[0037] (5) By using network card binding technology, even if one of the physical channels is interrupted due to electromagnetic interference or equipment failure, the other physical channels and thus the entire logical channel remain connected, and the entire channel communication between the mobile large machinery and the fixed end is highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0039] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0040] Figure 2 Schematic diagram of a channel according to an embodiment of the present invention.

[0041] Figure 1 In: 100, track; 111, mobile terminal; 112, fixed terminal; 121, first relay point; 122, second relay point; 211, first communication PLC; 212, second communication PLC; 221, first industrial computer; 222, second industrial computer; 231, first wireless bridge; 232, second wireless bridge; 241, third wireless bridge; 242, fourth wireless bridge.

[0042] Figure 2 In Chinese: LAN1 is enp1s0, LAN2 is enp2s0, LAN3 is enp3s0, and so on. DETAILED DESCRIPTION

[0043] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention are further described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0044] In this embodiment, at least two wireless communication devices are provided to form a wireless communication system with redundancy; when one of the wireless systems is disturbed or fails, the other systems continue to maintain communication, thereby ensuring the reliability of the present invention.

[0045] like Figure 1 , Figure 2 As shown, the communication channel of this embodiment consists of two parts: the first part is a wireless communication channel between the mobile terminal 111 and the first relay point 121 and the second relay point 122; the second part is a wired communication channel between the first relay point 121, the second relay point 122 and the fixed terminal 112. At both ends of the communication channel, multi-network port industrial computers with LINUX operating system are installed, one end is the first industrial computer 221, and the other end is the second industrial computer 222; the mobile terminal 111 moves along the track 100.

[0046] One of the physical network cards in the first industrial computer 221 is connected to the network port of the first communication PLC 211 through a wired transmission medium, forming a first physical channel 1. One of the physical network cards in the second industrial computer 222 is connected to the network port of the second communication PLC 212 through a wired transmission medium, forming a second physical channel 2. The first wireless bridge 231 and the second wireless bridge 232 establish a physical channel 31 through electromagnetic waves; the third wireless bridge 241 and the fourth wireless bridge 242 establish a physical channel 32 through electromagnetic waves;

[0047] The two physical network cards (enp3s0, enp4s0) on the first industrial computer 221 are respectively connected to the wired network ports of the first wireless bridge 231 and the second wireless bridge 232 through wired transmission media, thereby establishing physical channels 11 and 12 respectively.

[0048] Correspondingly, the two physical network cards (enp3s0, enp4s0) on the second industrial computer 222 are respectively connected to the wired network ports of the third wireless bridge 241 and the fourth wireless bridge 242 through wired transmission media, thereby establishing the physical channel 21 and the physical channel 22 respectively.

[0049] Physical channel 11 and physical channel 31, physical channel 31 and physical channel 21 are respectively connected by the first wireless bridge 231 and the second wireless bridge 232 to form physical channel 41; correspondingly, physical channel 12 and physical channel 32, physical channel 32 and physical channel 22 are respectively connected by the third wireless bridge 241 and the fourth wireless bridge 242 to form physical channel 42.

[0050] The first industrial computer 221 aggregates two physical network cards (enp3s0 and enp4s0) into one logical network card (denoted as bond0) through the network card bonding technology; correspondingly, the second industrial computer 222 also aggregates two physical network cards (enp3s0 and enp4s0) into one logical network card (denoted as bond0).

[0051] Since the two physical network cards enp3s0 and enp4s0 corresponding to the logical network card bond0 of the first industrial computer 221 are respectively connected to one end of the physical channel 41 and the physical channel 42, the two physical network cards enp3s0 and enp4s0 corresponding to the logical network card bond0 of the second industrial computer 222 are respectively connected to the other end of the physical channel 41 and the physical channel 42; the physical channel 41 and the physical channel 42 thus form a logical channel 1.

[0052] In the first industrial computer 221, the physical network card enp5s0 and the logical network card bond0 are bridged into an interface (vmbr100); similarly, in the second industrial computer 222, they are bridged into an interface (vmbr100) in the same form; in this way, the physical channel 1, the logical channel 1 and the physical channel 2 are connected, and a complete channel (consisting of the physical channel 1, the logical channel 1 and the physical channel 2 in sequence) is established between the first communication PLC 211 and the second communication PLC 212, realizing the transmission of control signals between the PLCs.

[0053] The fixed end 112 in this embodiment can be any fixed, immovable facility, such as a dock office building, etc.; the mobile end 111 can be, for example, engineering machinery or mobile machinery, or machinery such as a rail-mounted field bridge, AGV (automatic guided vehicle), etc.; the first relay point 121 and the second relay point 122 can be located at both ends of the walking range, or in an area outside the walking range, as long as it can be ensured that the mobile end 111 and the first relay point 121 and the second relay point 122 are in full visual condition; the first industrial computer 221 and the second industrial computer 222 are routers or switches that support network card binding (BONDING) / link aggregation technology, and their network cards can be electrical ports or optical ports; the first communication PLC and the second communication PLC can be replaced by computers (CMS computers, industrial computers) or other control and transmission equipment (inverters, HMI touch screens, etc.).

[0054] When any channel (network interface, wired transmission medium, wireless bridge and its electromagnetic waves, etc.) of physical channel 41 or physical channel 42 in logical channel 1 fails, the other physical channel and thus logical channel 1 still maintains normal communication, and data between mobile terminal 111 and fixed terminal 112 can still be communicated reliably.

[0055] This embodiment only uses a two-way wired and wireless communication system as a specific description. In actual use, the present invention can be expanded in the same manner to form a multi-way wired and wireless communication system.

[0056] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0057] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0058] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0059] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A two-way wireless and wired communication system, characterized in that: It includes a mobile terminal, a first relay point, a second relay point and a fixed terminal; The mobile terminal walks along a track and / or a fixed route; the mobile terminal and at least one of the first relay point and the second relay point remain free on the shortest path at any time; The mobile terminal is provided with a physical network card group and two wireless network bridges, and the physical network card group in the mobile terminal is connected to the wireless network bridge in the mobile terminal via a wired transmission medium; The first relay point and the second relay point are independently connected via a built-in wireless bridge and a wireless bridge set in the mobile terminal in the form of electromagnetic waves; A physical network card group is provided in the fixed end, and the physical network card group in the fixed end is connected to the wireless bridges in the first relay point and the second relay point through a wired transmission medium; The mobile terminal, the first relay point and the fixed terminal form a first channel through wired connection and wireless connection; The mobile terminal, the second relay point and the fixed terminal form a second channel through wired connection and wireless connection; the first channel and the second channel form a logical channel through network card binding and / or link aggregation; The physical network card group set in the mobile terminal forms a first logical network card through network card binding and / or link aggregation; The physical network card group set in the fixed end forms a second logical network card through network card binding and / or link aggregation; The mobile terminal and the fixed terminal are both provided with a multi-network port industrial computer; A communication PLC is arranged outside the multi-network port industrial computer arranged at the mobile end and the fixed end, or the physical network card group and the physical network card of the fixed end and the mobile end are arranged in the multi-network port industrial computer and the physical network card in the multi-network port industrial computer is connected to the communication PLC by wire.

2. A two-way wireless and wired communication method, characterized in that: Applicable to the two-way wireless and wired communication system as claimed in claim 1; A physical network card is provided in the mobile terminal, and the physical network card forms a first physical channel with a communication PLC built in the mobile terminal; and two network cards of the physical network card group are independently connected with two wireless bridges built in the mobile terminal by wired connection to form a third physical channel and a fourth physical channel; A physical network card is arranged in the fixed end, and the physical network card forms a second physical channel with the communication PLC built into the fixed end; and two network cards of the physical network card group are independently connected with the wireless network bridge arranged in the first relay point and the wireless network bridge in the second relay point by wired connection to form a fifth physical channel and a sixth physical channel respectively; The first wireless network bridge built into the mobile terminal and the second wireless network bridge built into the first relay point are connected in a manner of electromagnetic waves to form a seventh physical channel; The third wireless network bridge built into the mobile terminal and the fourth wireless network bridge built into the second relay point are connected in a manner of electromagnetic waves to form an eighth physical channel; The third physical channel, the seventh physical channel, and the fifth physical channel are bridged by the first wireless bridge and the second wireless bridge to form a ninth physical channel; The fourth physical channel, the eighth physical channel, and the sixth physical channel are bridged by the third wireless bridge and the fourth wireless bridge to form a tenth physical channel; The first logical network card, the ninth physical channel, the tenth physical channel, and the second logical network card form a first logical channel; The first physical channel, the first logical channel, and the second physical channel, after being bridged by the first industrial computer and the second industrial computer, form a second logical / physical channel to establish a complete communication channel between the first communication PLC and the second communication PLC.

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