CN114745758A - Multi-base station fusion communication method, system, computer equipment and storage medium - Google Patents

Multi-base station fusion communication method, system, computer equipment and storage medium Download PDF

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Publication number
CN114745758A
CN114745758A CN202210492036.0A CN202210492036A CN114745758A CN 114745758 A CN114745758 A CN 114745758A CN 202210492036 A CN202210492036 A CN 202210492036A CN 114745758 A CN114745758 A CN 114745758A
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China
Prior art keywords
ship
base station
service base
information
position information
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Pending
Application number
CN202210492036.0A
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Chinese (zh)
Inventor
范文峰
范晓月
蓝启威
陈敬普
龚鑫鹏
韩斌
范嵩
王峰
文小波
文明忠
胡华锋
刘士军
魏操
杨茁
凌文豪
何国彬
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Guangzhou Maritime Technology Co ltd
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Guangzhou Maritime Technology Co ltd
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Priority to CN202210492036.0A priority Critical patent/CN114745758A/en
Publication of CN114745758A publication Critical patent/CN114745758A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to a multi-base station fusion communication method, a system, computer equipment and a storage medium, and the technical scheme is as follows: the method comprises the following steps: receiving uplink communication information sent by a ship to a current service base station, and then sending the uplink communication information to a core network; receiving downlink communication information fed back by the core network; judging whether the connection between the ship and the current service base station is disconnected or not according to the position information of the ship and the position information of the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and sending the downlink communication information to the ship by the new service base station; this application has the communication quality who ensures boats and ships, is convenient for carry out the effect of commander dispatch to boats and ships.

Description

Multi-base station fusion communication method, system, computer equipment and storage medium
Technical Field
The present invention relates to the field of ship communication technologies, and in particular, to a method, a system, a computer device, and a storage medium for multi-base station converged communication.
Background
Along with the increasingly busy inland river traffic, more and more ships sailing in the inland river become more and more important for the management of the ships, and particularly when an emergency occurs, a command and dispatch center is more needed to uniformly command and dispatch the ships.
However, in the course of sailing, a ship sailing in an inland river, especially a ship sailing on the sea, is very easy to generate a situation of poor signal, even a situation of ship loss, and the possibility of suspicious ships existing no matter in inland river maritime, therefore, the communication quality of the ship is urgently needed to be ensured, thereby facilitating command and scheduling of the ship and timely early warning of the ship.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a multi-base station fusion communication method which has the functional advantages of ensuring the communication quality of a ship and facilitating command and scheduling of the ship.
The technical purpose of the invention is realized by the following technical scheme:
a multi-base station fusion communication method comprises the following steps:
receiving uplink communication information sent by a ship to a current service base station, and then sending the uplink communication information to a core network;
receiving downlink communication information fed back by the core network;
and judging whether the connection between the ship and the current service base station is disconnected or not according to the position information of the ship and the position information of the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and sending the downlink communication information to the ship by the new service base station.
Optionally, the determining whether to disconnect the ship from the current service base station according to the position information of the ship and the position information of the current service base station includes:
acquiring the position information of the ship and the position information of the current service base station;
and calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and disconnecting the ship from the current service base station if the actual communication distance is greater than the communication distance threshold value.
Optionally, the connecting the ship with a new service base station meeting the communication condition includes:
and the position information and the channel information of all base stations adjacent to the current service base station disconnected with the ship are sent to the ship, the ship selects a base station meeting communication conditions from all adjacent base stations as a new service base station according to the position information and the position information of all adjacent base stations, and then the connection between the ship and the new service base station is established according to the channel information corresponding to the new service base station.
Optionally, the method further includes:
receiving scheduling information sent by a command scheduling center, wherein the scheduling information comprises position information of a ship to be scheduled and a ship identification code;
and determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
Optionally, the method further includes: a VHF or UHF emergency communication channel is set up.
The invention also provides a multi-base station fusion communication system, which comprises:
the communication information transceiving module is used for receiving uplink communication information sent by a ship to a current service base station and then sending the uplink communication information to a core network;
a feedback information receiving module, configured to receive downlink communication information fed back by the core network;
and the judging and sending module is used for judging whether the connection between the ship and the current service base station is disconnected or not according to the position information of the ship and the position information of the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and the new service base station sends the downlink communication information to the ship.
Optionally, the feedback information receiving module includes:
a position information acquisition unit for acquiring position information of the ship and position information of a current service base station;
and the calculation and comparison unit is used for calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, then comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and if the actual communication distance is greater than the communication distance threshold value, disconnecting the ship from the current service base station.
Optionally, the method further includes:
the dispatching information receiving module is used for receiving dispatching information sent by a commanding and dispatching center, wherein the dispatching information comprises position information of a ship to be dispatched and a ship identification code;
and the dispatching information sending module is used for determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
The invention also provides a computer device comprising a memory storing a computer program and a processor implementing the steps of the method as described above when executing the computer program.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method as described above.
In conclusion, the invention has the following beneficial effects: the communication quality of the ship is guaranteed in the ship navigation process, the command and dispatch center can conveniently and uniformly command and dispatch the ship, linkage law enforcement is realized, and the ship can conveniently send out distress information under the emergency condition.
Drawings
FIG. 1 is a schematic flow diagram of a method provided by the present invention;
fig. 2 is a block diagram of a multi-base station converged communication system provided by the present invention;
fig. 3 is an internal structural diagram of a computer device in the embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "first", "second" and "first" are used for descriptive purposes only and are 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 one or more of that feature.
The invention is described in detail below with reference to the figures and examples.
The invention provides a multi-base station fusion communication method, as shown in fig. 1, comprising:
step 100, receiving uplink communication information sent by a ship to a current service base station, and then sending the uplink communication information to a core network;
200, receiving downlink communication information fed back by the core network;
step 300, judging whether the connection between the ship and the current service base station is disconnected or not according to the distance between the ship and the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and sending the downlink communication information to the ship by the new service base station.
In practical application, due to the position change of a ship in the navigation process, after the distance between the ship and a current service base station becomes longer, the communication of the ship is influenced, so that the administration of the ship in the navigation process is influenced, the communication quality between the ship and the current service base station can be judged through the position information of the ship and the position information of the current service base station, under the condition that the communication quality between the ship and the current service base station is poor, the connection between the ship and the current service base station can be actively disconnected, then the base station closest to the ship at present, namely the base station with better communication quality between the ship and the ship at present is connected with the ship, so that the communication quality of the ship is ensured, and the downlink communication information fed back from a core network can be sent to the ship; and under the condition that the communication quality of the ship and the current service base station is good, continuing to maintain the connection of the ship and the current service base station.
Further, the determining whether to disconnect the ship from the current service base station according to the position information of the ship and the position information of the current service base station includes:
acquiring the position information of the ship and the position information of the current service base station;
and calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and disconnecting the ship from the current service base station if the actual communication distance is greater than the communication distance threshold value.
Specifically, the position information of the ship can be obtained from ship AIS information sent by the ship, the position information of the current service base station is prestored base station position information, the position information of all base stations can be stored, and the position information of all base stations can be updated in real time, in practical application, the wireless coverage area of a base station is limited, and the communication quality of the ship gradually deteriorates in the process that the ship gradually gets away from the current service base station, so that after the actual communication distance between the ship and the current service base station is obtained through calculation, the communication distance between the ship and the current service base station can be mastered in real time, then the actual communication distance is compared with the communication distance threshold of the current service base station, and when the actual communication distance is greater than the communication distance threshold, that is, the communication quality between the ship and the current service base station is poor, and disconnecting the ship from the current service base station, wherein the communication distance threshold is preset and can be modified according to the actual wireless coverage areas of different base stations.
Further, the connecting the ship with the new service base station meeting the communication condition comprises:
and the ship selects a base station meeting the communication condition from all adjacent base stations as a new service base station according to the position information of the ship and the position information of all adjacent base stations, and then establishes the connection between the ship and the new service base station according to the channel information corresponding to the new service base station.
In practical application, a plurality of base stations are usually arranged in a navigation area of a ship, so that after the ship is disconnected from a current service base station, another base station with good communication quality can be selected to be connected.
Further, still include:
receiving scheduling information sent by a command scheduling center, wherein the scheduling information comprises position information of a ship to be scheduled and a ship identification code;
and determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
In practical application, the ship identification code of the ship to be dispatched is acquired from the ship AIS information sent by the dispatching ship, when an emergency occurs, such as the ship has collision risk, the front bridge body collapses and other accidents, the command and dispatch center can send dispatching information containing an instruction of stopping continuous navigation or course navigation to the possibly affected ship (namely the ship to be dispatched), then a base station closest to the ship to be dispatched can be selected according to the position information to be dispatched and propagated and the position information of all the base stations stored in advance, and then the dispatching information is sent to the ship to be dispatched through the base station to command the ship to navigate.
In practical application, suspicious ships may appear in a navigation area, the suspicious ships are usually found by a camera arranged in the navigation area or detected by a radar, under the condition that the suspicious ships are found, the information such as the ship number and the ship type of the suspicious ships can be obtained through image information collected by the camera, the ship identification number of the suspicious ships is obtained through inquiry according to the information such as the ship number and the ship type of the suspicious ships, and then the suspicious ships communicate with the suspicious ships through a base station according to the ship identification numbers of the suspicious ships, so that linkage law enforcement is realized.
Further, comprising: a VHF or UHF emergency communication channel is set up. Through the establishment of the VHF or UHF emergency communication channel, when an emergency situation occurs at sea or in a river, a ship at sea or in the river can send emergency help-seeking information through the VHF or UHF emergency communication channel.
The multi-base station fusion communication method can uniformly command and dispatch the ship, is convenient for the ship to send out distress information under emergency conditions, and can ensure the communication quality of the ship in the navigation process.
As shown in fig. 2, the present invention further provides a multi-base station converged communication system, which includes:
the communication information transceiving module 10 is configured to receive uplink communication information sent by a ship to a current service base station, and then send the uplink communication information to a core network;
a feedback information receiving module 20, configured to receive downlink communication information fed back by the core network;
and a judging and sending module 30, configured to judge whether to disconnect the ship from the current service base station according to the position information of the ship and the position information of the current service base station, and if so, connect the ship with a new service base station that satisfies communication conditions of the ship, and then send the downlink communication information to the new service base station, where the new service base station sends the downlink communication information to the ship.
Further, the feedback information receiving module includes:
a position information acquisition unit for acquiring position information of the ship and position information of a current service base station;
and the calculation and comparison unit is used for calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, then comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and if the actual communication distance is greater than the communication distance threshold value, disconnecting the ship from the current service base station.
Further, still include:
the dispatching information receiving module is used for receiving dispatching information sent by a commanding and dispatching center, wherein the dispatching information comprises position information of a ship to be dispatched and a ship identification code;
and the dispatching information sending module is used for determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
For specific limitations of a multi-bs converged communication system, reference may be made to the above limitations on a multi-bs converged communication method, which is not described herein again. All or part of the modules in the multi-base station converged communication system can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The computer program is executed by a processor to realize a multi-base station converged communication method.
Those skilled in the art will appreciate that the architecture shown in fig. 3 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory having a computer program stored therein and a processor that when executing the computer program performs the steps of:
receiving uplink communication information sent by a ship to a current service base station, and then sending the uplink communication information to a core network;
receiving downlink communication information fed back by the core network;
and judging whether the connection between the ship and the current service base station is disconnected or not according to the position information of the ship and the position information of the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and sending the downlink communication information to the ship by the new service base station.
In one embodiment, the determining whether to disconnect the ship from the current service base station according to the position information of the ship and the position information of the current service base station includes:
acquiring the position information of the ship and the position information of the current service base station;
and calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and disconnecting the ship from the current service base station if the actual communication distance is greater than the communication distance threshold value.
In one embodiment, said connecting the ship with a new serving base station satisfying its communication conditions comprises:
and the ship selects a base station meeting the communication condition from all adjacent base stations as a new service base station according to the position information of the ship and the position information of all adjacent base stations, and then establishes the connection between the ship and the new service base station according to the channel information corresponding to the new service base station.
In one embodiment, further comprising:
receiving scheduling information sent by a command scheduling center, wherein the scheduling information comprises position information of a ship to be scheduled and a ship identification code;
and determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
In one embodiment, further comprising: a VHF or UHF emergency communication channel is set up.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (10)

1. A multi-base station converged communication method is characterized by comprising the following steps:
receiving uplink communication information sent by a ship to a current service base station, and then sending the uplink communication information to a core network;
receiving downlink communication information fed back by the core network;
and judging whether the connection between the ship and the current service base station is disconnected or not according to the position information of the ship and the position information of the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and sending the downlink communication information to the ship by the new service base station.
2. The multi-base-station converged communication method according to claim 1, wherein the determining whether to disconnect the ship from the current service base station according to the position information of the ship and the position information of the current service base station comprises:
acquiring the position information of the ship and the position information of the current service base station;
and calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and disconnecting the ship from the current service base station if the actual communication distance is greater than the communication distance threshold value.
3. The multi-base station converged communication method according to claim 1, wherein the connecting the ship with the new serving base station satisfying its communication condition comprises:
and the position information and the channel information of all base stations adjacent to the current service base station disconnected with the ship are sent to the ship, the ship selects a base station meeting communication conditions from all adjacent base stations as a new service base station according to the position information and the position information of all adjacent base stations, and then the connection between the ship and the new service base station is established according to the channel information corresponding to the new service base station.
4. The multi-base station converged communication method of claim 1, further comprising:
receiving scheduling information sent by a command scheduling center, wherein the scheduling information comprises position information of a ship to be scheduled and a ship identification code;
and determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
5. A multi-base station converged communication method according to claim 1, further comprising: a VHF or UHF emergency communication channel is set up.
6. A multi-base station converged communication system, comprising:
the communication information transceiving module is used for receiving uplink communication information sent by a ship to a current service base station and then sending the uplink communication information to a core network;
a feedback information receiving module, configured to receive downlink communication information fed back by the core network;
and the judging and sending module is used for judging whether the connection between the ship and the current service base station is disconnected or not according to the position information of the ship and the position information of the current service base station, if so, connecting the ship and a new service base station meeting the communication condition of the ship, and then sending the downlink communication information to the new service base station, and the new service base station sends the downlink communication information to the ship.
7. The multi-base station converged communication system according to claim 6, wherein the feedback information receiving module comprises:
a position information acquisition unit for acquiring position information of the ship and position information of a current service base station;
and the calculation and comparison unit is used for calculating the actual communication distance between the ship and the current service base station according to the position information of the ship and the position information of the current service base station, then comparing the actual communication distance with a preset communication distance threshold value of the current service base station, and if the actual communication distance is greater than the communication distance threshold value, disconnecting the ship from the current service base station.
8. The multi-base station converged communication system according to claim 6, further comprising:
the dispatching information receiving module is used for receiving dispatching information sent by a commanding and dispatching center, wherein the dispatching information comprises position information of a ship to be dispatched and a ship identification code;
and the dispatching information sending module is used for determining a base station closest to the ship according to the position information of the ship to be dispatched, and sending dispatching information to the ship to be dispatched through the base station according to the ship identification code.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
CN202210492036.0A 2022-05-07 2022-05-07 Multi-base station fusion communication method, system, computer equipment and storage medium Pending CN114745758A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1553789A2 (en) * 2003-12-23 2005-07-13 TeliaSonera Finland Oyj Data transmission at sea
KR20150017030A (en) * 2013-08-05 2015-02-16 목포대학교산학협력단 Communication method according to ship types and ais data communication
CN111148172A (en) * 2020-01-14 2020-05-12 南通大学 Mobile communication antenna-based maritime user access switching method
CN112822739A (en) * 2021-04-19 2021-05-18 交通运输部规划研究院 VHF (very high frequency) bank real-time scheduling method and system
CN113207154A (en) * 2021-04-30 2021-08-03 上海海事大学 Method for switching multi-shore-based base station of ocean internet and establishing communication between multi-shore-based base station and mobile ship

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1553789A2 (en) * 2003-12-23 2005-07-13 TeliaSonera Finland Oyj Data transmission at sea
KR20150017030A (en) * 2013-08-05 2015-02-16 목포대학교산학협력단 Communication method according to ship types and ais data communication
CN111148172A (en) * 2020-01-14 2020-05-12 南通大学 Mobile communication antenna-based maritime user access switching method
CN112822739A (en) * 2021-04-19 2021-05-18 交通运输部规划研究院 VHF (very high frequency) bank real-time scheduling method and system
CN113207154A (en) * 2021-04-30 2021-08-03 上海海事大学 Method for switching multi-shore-based base station of ocean internet and establishing communication between multi-shore-based base station and mobile ship

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