CN115278601A - High-speed railway vehicle-mounted terminal communication method based on multipoint transmission - Google Patents
High-speed railway vehicle-mounted terminal communication method based on multipoint transmission Download PDFInfo
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- CN115278601A CN115278601A CN202210717827.9A CN202210717827A CN115278601A CN 115278601 A CN115278601 A CN 115278601A CN 202210717827 A CN202210717827 A CN 202210717827A CN 115278601 A CN115278601 A CN 115278601A
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- 238000010586 diagram Methods 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- 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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
Abstract
The invention provides a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission. The method comprises the following steps: the method comprises the steps that a CPE (customer premises equipment) is arranged on a carriage, all mobile phone terminals in the carriage are in wireless connection with the CPE, a distributed antenna DAS is deployed in each carriage, the CPE is in wireless connection with at least one DAS, the DAS is in wireless communication connection with a base station deployed on the ground, and a plurality of DASs form a distributed antenna system; the wireless signals transmitted by the base station are transmitted to the DAS of the distributed antenna system arranged on the carriage through the wireless communication link in the space, then transmitted to the CPE through the DAS, and then converted into WiFi signals through the CPE equipment, and transmitted to the user terminal UE in the carriage, so that the wireless signal coverage in the carriage is completed. The method of the invention forms the networking of the high-speed railway vehicle-mounted terminal by utilizing the multipoint transmission technology, and solves the problems of frequent switching of wireless communication and capacity guarantee caused by high-speed movement of a train in a high-speed railway scene by designing a communication mechanism between the vehicle-mounted terminal and a communication base station.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission.
Background
Along with the development of society, people have higher and higher requirements on communication technology, the new generation communication technology not only needs to solve people-to-people communication, provides more immersive and extremely-appealing business experience such as augmented reality, virtual reality, ultra-high definition (3D) video and the like for users, but also needs to solve the problems of people-to-object and object-to-object communication, and meets the application requirements of the internet of things such as mobile medical treatment, internet of vehicles, smart home, industrial control and environmental monitoring. In addition, a new generation of communication technology will permeate into various fields of the economic society, and becomes a key novel infrastructure for supporting the digitization, networking and intelligent transformation of the economic society. With this background, fifth generation mobile communication technology has been developed (5G). The 5G communication supports three services of eMBB, URLLC and mass connection, and particularly supports the 5G vertical industry service, so that the 5G communication is promoted to start a new research and industrialization trend. However, the increase in the variety of application scenarios and environments poses new challenges to the development of communication technologies. In the high-speed railway scene, how to solve the high-speed wireless transmission under the rapid movement becomes an important technical problem.
Under the condition of high-speed movement, the wireless communication terminal moves at a high speed relative to the ground along with the train and quickly passes through the coverage area of a single wireless cell. To ensure the continuity of wireless communication, fast cell switching must be supported.
In a traditional networking mode that a mobile phone terminal is directly connected with a base station, the mobile phone terminal directly initiates an access request to the base station, after connection is established, a target switching cell is determined through neighbor cell measurement and a cell reselection mechanism, the mobile phone terminal initiates the access request to the target cell, after the request is received, the mobile phone terminal is disconnected with a current service cell and establishes new connection with the target cell, and therefore service continuity is guaranteed.
The traditional switching method has the problems of long switching selection time, frequent switching and the like in a high-speed moving scene. Meanwhile, as the number of passengers in the train is large, the number of users initiating switching is large, signaling storms are easy to generate, the probability of collision of random access is high, and the access success rate and the switching success rate are difficult to guarantee.
To address the above problems in high-speed mobile scenarios, another networking approach is considered. Namely, a wireless communication CPE (customer premise equipment) is arranged on a high-speed railway carriage, and a mobile phone terminal in the carriage is directly connected with the CPE. The CPE is connected to a wireless communication base station deployed on the ground. All the mobile phone terminals in one compartment can be regarded as a whole to be connected with the wireless communication base station, and the occupation of control signaling is reduced. Meanwhile, a wireless communication base station deployed on the ground is deployed in a Radio Remote Unit (RRU) manner, and RRUs (radio remote units) deployed at adjacent sites are connected to the same BBU (baseband processing unit) to form a logical cell, thereby reducing the number of times of switching. However, the number of the constituent logical cells needs to be limited, and there is a risk that the capacity of the logical cell consisting of an excessive number of RRUs is limited.
At present, the wireless communication method in the high-speed mobile scene in the prior art faces the problems of frequent switching, long selection time, incapability of ensuring the communication quality and the like, and can not well meet the communication requirements of numerous passengers in a train. And the improved CPE networking mode needs to limit the number of the formed logical cells, and the risk of limited capacity exists.
Disclosure of Invention
The embodiment of the invention provides a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission, which is used for improving the communication quality of a high-speed railway vehicle-mounted terminal.
In order to achieve the purpose, the invention adopts the following technical scheme.
A high-speed railway vehicle-mounted terminal communication method based on multipoint transmission comprises the following steps:
the method comprises the steps that a Customer Premises Equipment (CPE) is arranged on a carriage of a high-speed railway, all mobile phone terminals in the carriage are in wireless connection with the CPE, a distributed antenna is deployed in each carriage, the CPE is in wireless connection with at least one DAS, the DAS is in wireless communication connection with a base station deployed on the ground, and a plurality of Distributed Antenna Systems (DASs) are formed;
the wireless signals transmitted by the base station are transmitted to the antennas of the distributed antenna system DAS deployed on the carriage through the wireless communication link in the space, then transmitted to the CPE through the antennas, and then converted into WiFi signals through the CPE equipment, and transmitted to the user terminal UE in the carriage, so that the wireless signal coverage in the carriage is completed.
Preferably, the base station includes a radio remote unit RRU, a baseband processing unit BBU and an antenna, one BBU device is connected to one RRU device, one BBU device is connected to multiple RRU devices, each RRU device is connected to one antenna, and the antenna is wirelessly connected to the DAS.
Preferably, the base station includes RRUs, BBUs and antennas, one BBU device is connected to one RRU device, and each RRU device is connected to one antenna, which is wirelessly connected to the DAS.
Preferably, the base station includes RRUs, BBUs and antennas, the DAS is disposed at a connection position of adjacent cars, the CPE is wirelessly connected to the DAS in the car where the CPE is located, one BBU device is connected to one RRU device, and each RRU device is connected to one antenna, which is then wirelessly connected to the DAS.
According to the technical scheme provided by the embodiment of the invention, the embodiment of the invention provides the high-speed railway vehicle-mounted terminal communication device and method based on multipoint transmission, the networking of the high-speed railway vehicle-mounted terminal is mainly formed by utilizing the multipoint transmission technology, the problems of frequent switching of wireless communication and capacity guarantee caused by high-speed movement of a train in a high-speed railway scene are solved by designing a communication mechanism between the vehicle-mounted terminal and a communication base station, and the communication quality is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an implementation of a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission according to an embodiment of the present invention;
fig. 2 is a signal transmission flow chart of a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission according to an embodiment of the present invention;
fig. 3 is a schematic view of an alternative scheme of a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an alternative scheme two of the high-speed railway vehicle-mounted terminal communication method based on multipoint transmission provided by the embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The embodiment of the invention provides that the multipoint transmission support is added on the vehicle-mounted terminal to form capacity improvement between the vehicle-mounted terminal and a plurality of wireless base stations deployed on the ground. Based on the existing CPE networking mode, a DAS (distributed antenna) is added, and a DAS is deployed at each car position, so that a plurality of TRPs (Transmitting Receiving points) exist in a single CPE device in a linear railway line direction. And correspondingly, in the wireless base station equipment deployed on the ground, the antenna of each site also supports Multi-point transmission (Multi-TRP). The scheme can finally form a networking environment for carrying out multipoint transmission between the CPE and the wireless base station equipment, and the multipoint transmission technology is adopted to achieve the purpose of enhancing the total capacity of a transmission link between the CPE and the wireless base station equipment. Meanwhile, the DAS is deployed on the CPE equipment in multiple sections of carriages, so that compared with the existing CPE scheme, the switching frequency can be further reduced, and the communication continuity is better guaranteed. The DAS is composed of antennas at different locations.
Fig. 1 is a schematic diagram of an implementation of a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission according to an embodiment of the present invention, where the present invention adopts a vehicle-mounted CPE mode for networking, and a CPE device is disposed on a car, for example, at the top of the car. All the mobile phone terminal services in the car can be regarded as a whole, and are carried by the CPE equipment and communicated with the wireless communication base station deployed on the ground. The wireless communication base station deployed on the ground can adopt a traditional wireless networking mode that a single station corresponds to an independent logical cell, and can also adopt a scheme as shown in fig. 1, and utilizes a Radio Remote Unit (RRU) technology to connect RRUs of a plurality of stations to the same BBU and combine the RRUs into a logical cell, thereby reducing the switching times. Compared with the existing CPE scheme, the scheme of the invention has the greatest innovation point that the DAS is deployed in each car, for example, the DAS is arranged at the top end of each car, and different antennas of the DAS are arranged at the top ends of different cars. The carriages are connected, and the antennas are connected by feeder lines or optical cables. Therefore, a multipoint transmission networking environment between the CPE and the wireless base station equipment is formed, the initial purpose of the design of the embodiment of the invention is realized, namely the problems and risks of frequent switching and limited capacity of the existing high-speed mobile scene wireless communication scheme are solved, the total capacity of a transmission link is improved, the switching frequency is reduced, and the communication quality and stability are improved.
Fig. 2 is a signal transmission flow chart of a high-speed railway vehicle-mounted terminal communication method based on multipoint transmission according to an embodiment of the present invention. The wireless signal is transmitted from a wireless communication base station deployed on the ground, and the base station consists of a BBU, an RRU and an antenna. After the signal is transmitted, the signal is transmitted to a receiving antenna of a distributed antenna system arranged on a carriage through a wireless communication link in the space, and then is transmitted to CPE through the DAS. And finally, the CPE Equipment converts the transmitted wireless signals into WiFi signals, and transmits the WiFi signals to User Equipment (User Equipment, user terminal) in the carriage to complete signal coverage in the carriage.
The deployment scheme shown in fig. 1 is the best scheme, where one BBU device is connected to multiple RRU devices, and each RRU device is connected to one antenna, and the antenna is wirelessly connected to the DAS. In actual deployment, a conventional wireless base station deployment method may be considered, as shown in fig. 3; that is, one BBU device is connected to one RRU device, and each RRU device is connected to one antenna, and the antenna is wirelessly connected to the DAS, instead of combining multiple stations into a logical cell. As shown in fig. 4, the CPE may only deploy an embodiment of the distributed antenna system with one adjacent car, and the CPE devices in all the cars except the car head and the car tail have only 3 DAS antennas. The 3 antennas of the DAS corresponding to the CPE of each car are respectively deployed in the previous car, the current car, and the next car.
The number of antennas per CPE for the optimal solution shown in fig. 1 is not limited, so the number of handovers and the number of formed multi-transceiver pairs for the optimal solution are significantly better than the second alternative shown in fig. 4.
Under the condition that the number of the antennas of each CPE is not limited, the number of the antennas contained in the DAS connected with each CPE can reach the maximum number of car sections. More antennas are added, on one hand, more communication pairs for multi-point communication can be formed to increase the capacity, on the other hand, the distributed antennas are distributed at larger distances, the transition area for switching is larger, and the probability of failure switching can be reduced. In summary, the invention adopts a networking mode of adding distributed antennas on the basis of a CPE networking mode, and compared with a traditional wireless networking mode of directly connecting a base station with a terminal and a common CPE networking mode, the switching frequency is obviously reduced.
In order to solve the problems that the capacity of a communication system is limited and the communication requirements of all passengers in a train cannot be met, the distributed antenna system is utilized to construct a multipoint communication environment, multipoint signal transmission between CPE equipment and a ground wireless base station is realized, and therefore the capacity of the communication system is increased.
The 5G is oriented to more wireless communication services and scenarios. Vertical industry applications are becoming a key direction for 5G commercial deployment. Wireless communication in high speed railway scenarios is of great interest in vertical applications. The requirements of 5G communication upgrading of the existing railway line and new communication technology introduction of the newly-built railway line are very vigorous. In China, railway lines are widely deployed, and the number of newly-built lines is large, so that the technical scheme of the invention has a good market scene.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A high-speed railway vehicle-mounted terminal communication method based on multipoint transmission is characterized by comprising the following steps:
the method comprises the following steps that Customer Premise Equipment (CPE) is arranged on carriages of a high-speed railway, wireless connection is established between all mobile phone terminals in the carriages and the CPE, a distributed antenna is deployed in each carriage, the CPE is in wireless connection with at least one DAS, the DAS is in wireless communication connection with a base station deployed on the ground, and a plurality of Distributed Antenna Systems (DAS) are formed;
the wireless signals transmitted by the base station are transmitted to the antennas of the distributed antenna system DAS deployed on the carriage through the wireless communication link in the space, then transmitted to the CPE through the antennas, and then converted into WiFi signals through the CPE equipment, and transmitted to the user terminal UE in the carriage, so that the wireless signal coverage in the carriage is completed.
2. The method of claim 1, wherein the base station comprises a Radio Remote Unit (RRU), a baseband processing unit (BBU) and antennas, one BBU device is connected with one RRU device, one BBU device is connected with a plurality of RRU devices, each RRU device is connected with one antenna, and the antenna is wirelessly connected with the DAS.
3. The method of claim 1, wherein the base station comprises RRUs, BBUs, and antennas, wherein one BBU device is connected to one RRU device, and wherein each RRU device is connected to one antenna, which is in turn wirelessly connected to the DAS.
4. The method of claim 1, wherein the base station comprises RRUs, BBUs and antennas, the DAS is deployed at a connection location of an adjacent car, the CPE is wirelessly connected to the DAS in the car where the CPE is located, one BBU device is connected to one RRU device, and each RRU device is connected to one antenna, which is in turn wirelessly connected to the DAS.
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| CN202210717827.9A CN115278601A (en) | 2022-06-20 | 2022-06-20 | High-speed railway vehicle-mounted terminal communication method based on multipoint transmission |
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| US20170214128A1 (en) * | 2014-07-24 | 2017-07-27 | Icomera Ab | Wireless train communication system |
| CN109905886A (en) * | 2017-12-11 | 2019-06-18 | 梁平 | Enhanced customer premise equipment |
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2022
- 2022-06-20 CN CN202210717827.9A patent/CN115278601A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011050840A1 (en) * | 2009-10-28 | 2011-05-05 | Nokia Siemens Networks Oy | Relayed communications in mobile environment |
| CN102726100A (en) * | 2009-12-02 | 2012-10-10 | 诺基亚西门子通信公司 | Handing over relayed connections in mobile environment |
| US20170214128A1 (en) * | 2014-07-24 | 2017-07-27 | Icomera Ab | Wireless train communication system |
| CN109905886A (en) * | 2017-12-11 | 2019-06-18 | 梁平 | Enhanced customer premise equipment |
Non-Patent Citations (1)
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| 杨艳: "5G高铁网络新架构及天馈发展趋势研究", 《移动通信》 * |
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