WO2010099658A1 - 使用无线局域网的移动通信***及车辆监控*** - Google Patents
使用无线局域网的移动通信***及车辆监控*** Download PDFInfo
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- WO2010099658A1 WO2010099658A1 PCT/CN2009/070641 CN2009070641W WO2010099658A1 WO 2010099658 A1 WO2010099658 A1 WO 2010099658A1 CN 2009070641 W CN2009070641 W CN 2009070641W WO 2010099658 A1 WO2010099658 A1 WO 2010099658A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
Definitions
- the present invention relates to mobile communications, and more particularly to a mobile communication system and a vehicle monitoring system using a wireless local area network. Background technique
- the 802.l lb/g/n protocol is used in wireless LANs, including wireless access points (APs) and multiple terminal devices (SAs).
- APs wireless access points
- SAs multiple terminal devices
- a common application is that multiple mobile terminal devices SA access an AP, and the AP is generally fixedly installed, as shown in FIG.
- the SA does not automatically switch to the AP with strong signal in the area.
- the road is interrupted, which affects the normal use of the service.
- the schematic diagram is shown in Figure 2.
- the technical problem to be solved by the present invention is to provide a link interruption and a large delay when a terminal device switches from one wireless access point to another in the above-mentioned wireless local area network communication system in the prior art, and provides a defect.
- a mobile communication system using a wireless local area network which enables seamless roaming in a wireless local area network.
- the present invention also provides a vehicle monitoring system using a wireless local area network.
- the technical solution adopted by the present invention to solve the technical problem thereof is: constructing a mobile communication system using a wireless local area network, comprising a wireless access point and a plurality of terminal devices, wherein the wireless access point is a mobile wireless access point, where the plurality of terminal devices are fixed in position and deployed at a predetermined interval, and the wireless access point selects terminals available in the plurality of terminal devices based on the strength of the link layer signal during the moving process.
- the device establishes a communication connection.
- the wireless local area network complies with the IEEE 802.11 protocol.
- the technical solution adopted by the present invention to solve the technical problem thereof is: constructing a vehicle monitoring system using a wireless local area network, comprising a wireless access point installed in the vehicle, and a fixed position at a predetermined interval along the traveling route of the vehicle. a plurality of terminal devices, and a central monitoring host connected to the plurality of terminal devices through a switch; the wireless access point is connected to at least one video collection and processing device, and the wireless access point is based on a link during the mobile process
- the layer signal strength indicates that the available terminal device is selected to establish a communication connection; the central monitoring host maintains a communication connection with the video collection and processing device with the monitored available terminal device as a default gateway.
- the wireless local area network complies with the IEEE 802.11 protocol.
- the central monitoring host is a computer equipped with video decoding software and/or hardware
- the video collecting and processing device includes a network video card and at least one connected thereto camera.
- the mobile communication system using the wireless local area network embodying the present invention has the following beneficial effects:
- the system operates stably, can realize seamless roaming in the wireless local area network, ensures continuous communication of the communication link, and does not cause data packet loss.
- FIG. 1 is a schematic diagram of the architecture of a conventional communication system using a wireless local area network
- 2 is a schematic diagram of a conventional communication system using a wireless local area network to switch APs during operation
- FIG. 3 is a schematic diagram of the architecture of a communication system using a wireless local area network according to the present invention.
- the concept of the present invention is to design a wireless access point (AP) as a mobile AP and fix the location of the terminal device on the infrastructure of the wireless local area network, and implement wireless mobile roaming by means of gateway intelligent switching to implement wireless local area network. Seamless roaming in. After testing with the Datal inc 810E+ product, the system constructed by the technical solution of the present invention is stable in operation, can realize seamless roaming in the wireless local area network, and ensures continuous and smooth communication link without data packet loss.
- AP wireless access point
- FIG. 3 is a block diagram showing the architecture of a communication system using a wireless local area network according to the present invention.
- the common application is that the SA accesses the AP, and the solution of the present invention adopts the method of SA fixed and AP mobile roaming.
- SA1, SA2, and SA3 are installed at a predetermined interval, so that the wireless signal coverages of the adjacent two terminal devices intersect (ie, at least partially overlap), and the area enclosed by the dotted line in the figure is the wireless of each terminal device.
- Signal range a system consisting of three terminal devices has two signal overlap areas.
- the terminal devices SA1, SA2, SA3, and PC2 are connected to the switch.
- a Datal inc 810E+ wireless device is used as an AP to connect to a computer PC1; another three 810E+ wireless devices are used as an SA to connect to a computer PC2 to access the switch, and two computers PC1 and PC2 Use the network ping command with each other. There is no packet loss under the default parameters, and the system works stably.
- the technical solution of the present invention can be mainly used for road and railway mobile monitoring, because if multiple APs are used, when an SA (such as a notebook's own wireless network card) moves out of the signal range of an AP, it will not quickly switch to another AP. The delay is large, but an AP can communicate with multiple SAs. When an AP spans several SA signals, there is no handover in the wireless part.
- SA such as a notebook's own wireless network card
- two computers are used. After the computer modifies the gateway by polling, the return value of the ping command is accumulated to a certain number of times, and the state of the AP is judged. If true, the other computer is notified to be modified to the specified one. Gateway, the two computers use the industrial 0PC data interface communication, after testing, the computer PC2 scans the computer PC1 data for a minimum of 20ms, can be modified within 50ms using the APi function. In the actual application of vehicle monitoring, with video decoding software and/or hardware, real-time images can be viewed on the computer PC2. Due to the buffer in the video server, the loss of several video frames will not cause the image quality to drop.
- the system includes three terminal devices SA1, SA2, SA3, an AP, and two computers PC1 and PC2, and the gateway is modified as follows:
- the PCI modification gateway is SA2, and the ping AP gets the return value b;
- the PCI modification gateway is SA3, and the ping AP gets the return value c;
- the value of a is valid, it indicates that the mobile AP is within the signal range of SA1, and notifies PC1 to modify the gateway to the address of SA1;
- the technical solution of the invention is mainly applied to the emergency monitoring in the railway compartment, and the distance between the train and the train usually exceeds the signal range of one SA, and the existing telephone network MODEM of the highway railway is used to dial the centralized control center, and the new one is currently
- the high-speed, railway has an optical fiber interface that can be used directly. Therefore, there can be multiple APs along the same line, for example, one AP is installed in each vehicle. These APs may have the same Service Set Identifier (SSID) or have different SSIDs. In the latter case, the AP SSIDs in a group of terminal devices, such as SA1, SA2, and SA3, need to be modified accordingly. If you need to monitor both directions, deploy 2 sets of terminal equipment.
- SSID Service Set Identifier
- the computer PC1 and the wireless AP can be installed in the passenger compartment.
- a computer video card responsible for video encoding is installed in the computer PC1
- real-time video images in the car are collected by at least one camera, and the video signals are transmitted to the computer PC2 0 through the wireless AP, the terminal device and the switch.
- PC2 can be used as a central monitoring host, which is equipped with video decoding software to decode the received video signal, and display the real-time video image in the car and store the image data on the display device connected to the central monitoring host.
- the central monitoring host is in the storage device.
- the wireless equipment used in this scheme has a low price. For example, if the domestic product is used, the cost of an SA station after considering the antenna-feeder system is only a thousand yuan.
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Description
说 明 书 使用无线局域网的移动通信***及车辆监控*** 技术领域
本发明涉及移动通信, 更具体地说, 涉及一种使用无线局域网的移动通 信***及车辆监控***。 背景技术
无线局域网中采用 802. l lb/g/n协议, 包括无线接入点 (AP)和多个终端 设备 (SA)。 普通的应用是多个移动的终端设备 SA接入一个 AP, AP—般固定 安装, 如图 1所示。 当***中存在多个 AP时, 即使当前 AP信号变弱, 或者 SA因移动而进入另一个 AP覆盖的区域时, SA不会自动切换到该区域的信号 强的 AP , 若要切换会发生链路中断, 影响业务的正常使用, 示意图如图 2所 示。
这种传统联网方式在一些特殊场合下不能满足移动通信中计算机主机与 终端设备之间的通信要求。 例如, 在公路 /铁路移动监控中, 因为如果采用多 个 AP , 当一个 SA (比如笔记本自带的无线网卡) 移动出某个 AP的信号范围 时, 不会快速切换到另一个 AP , 延迟较大, 在通信过程中会出现丢包现象。 发明内容
本发明要解决的技术问题在于, 针对现有技术的上述无线局域网通信系 统中终端设备从一个无线接入点切换到另一个接入点会发生链路中断且延迟 较大的缺陷, 提供一种使用无线局域网的移动通信***, 其可以实现无线局 域网中的无缝漫游。
本发明还提供一种使用无线局域网的车辆监控***。
本发明解决其技术问题所采用的技术方案是: 构造一种使用无线局域网 的移动通信***, 包括一个无线接入点和多个终端设备, 所述无线接入点为
移动式无线接入点, 所述多个终端设备位置固定并按预定间隔距离布署, 所 述无线接入点在移动过程中基于链路层信号强弱指示选择多个终端设备中可 用的终端设备建立通信连接。
在本发明所述的使用无线局域网的移动通信***中, 所述无线局域网遵 循 IEEE 802. 11协议。
在本发明所述的使用无线局域网的移动通信***中, 所述预定间隔距离 使得相邻两个所述终端设备的信号覆盖范围至少部分重叠。
本发明解决其技术问题所采用的技术方案是: 构造一种使用无线局域网 的车辆监控***, 包括一个安装在车辆中的无线接入点、 沿车辆行驶路线按 预定间隔距离布署的位置固定的多个终端设备、 以及通过交换机与所述多个 终端设备相连的中央监控主机; 所述无线接入点与至少一个视频采集及处理 装置相连, 所述无线接入点在移动过程中基于链路层信号强弱指示选择可用 的终端设备建立通信连接; 所述中央监控主机以监测到的可用终端设备作为 缺省网关来保持与所述视频采集及处理装置的通信连接。
在本发明所述的使用无线局域网的车辆监控***中, 所述无线局域网遵 循 IEEE 802. 11协议。
在本发明所述的使用无线局域网的车辆监控***中, 所述预定间隔距离 使得相邻两个终端设备的信号覆盖范围至少部分重叠。
在本发明所述的使用无线局域网的车辆监控***中, 所述中央监控主机 是安装有视频解码软件和 /或硬件的计算机, 所述视频采集及处理装置包括网 络视频卡及与其相连的至少一个摄像头。
实施本发明的使用无线局域网的移动通信***, 具有以下有益效果: 系 统运行稳定, 能够实现无线局域网中的无缝漫游, 保证通信链路的连续畅通, 不会发生数据丢包。 附图说明
下面将结合附图及实施例对本发明作进一步说明, 附图中:
图 1是传统使用无线局域网的通信***的架构示意图;
图 2是传统使用无线局域网的通信***在操作过程中切换 AP的示意图; 图 3是本发明使用无线局域网的通信***的架构示意图。 具体实施方式
本发明的构思是在无线局域网的基础架构上, 将无线接入点 (AP)设计成 移动式 AP, 而将终端设备的位置固定, 采用网关智能切换的方式实现无线移 动漫游, 以实现无线局域网中的无缝漫游。 利用 Datal inc公司 810E+产品测 试后, 本发明的技术方案构成的***运行稳定, 能够实现无线局域网中的无 缝漫游, 保证通信链路的连续畅通, 不会发生数据丢包。
图 3是本发明使用无线局域网的通信***的架构示意图。 普通应用为 SA 接入 AP, 而本发明的方案采用 SA固定, AP移动漫游的方式。 如图 3所示, SA1、 SA2和 SA3按预定间隔距离安装, 使得相邻两个终端设备的无线信号覆 盖范围相交(即至少部分重叠), 如图中虚线包围的区域为各个终端设备的无 线信号范围, 三个终端设备组成的***有两个信号重叠区域。 终端设备 SA1、 SA2、 SA3和 PC2机共同接入交换机。
因为 802. l lb/g协议中规定, 同一个 AP可连接多个 SA, AP与 SA之间的 可用信号如表一。
在一个实施例中, 利用一台 Datal inc公司的 810E+无线设备作为 AP, 连 接一台计算机 PC1 ; 另配三台 810E+无线设备作为 SA与一台计算机 PC2共同 接入交换机, 两台计算机 PC1、 PC2互相利用网络 ping命令, 在默认参数下 无任何丢包现象, ***工作稳定。
本发明的技术方案主要可用于公路铁路移动监控,因为如果采用多个 AP, 当一个 SA (比如笔记本自带的无线网卡)移动出某个 AP的信号范围时, 不会 快速切换到另一个 AP, 延迟较大, 但一个 AP完全可以与多个 SA进行通信, 当一个 AP跨越几个 SA的信号时, 无线部分并不存在切换。
在前述实施例中采用 2 台计算机, 一台计算机用轮询的方式修改网关后 用 ping命令的返回值累计到一定次数, 判断 AP的状态, 如果为真则通知另 一台计算机修改成指定的网关, 两台计算机之间采用工业 0PC数据接口通信, 经测, 计算机 PC2最短 20ms扫描计算机 PC1的数据后, 利用 APi函数 50ms 内即可修改完毕。 在车辆监控的实际应用中配合视频解码软件和 /或硬件, 计 算机 PC2 上即可观看到实时图像, 由于视频服务器内有缓存, 几个视频帧的 丢失平不会造成图像质量的下降。
在此实施例中, ***中包括三台终端设备 SA1, SA2, SA3,、 一台 AP及两 台计算机 PC1、 PC2 , 按如下方式修改网关:
PC1 修改网关为 SA1 , ping AP得到 返回值 a;
PCI 修改网关为 SA2 , ping AP得到 返回值 b;
PCI 修改网关为 SA3 , ping AP得到 返回值 c ;
如果 a值有效, 则说明移动 AP在 SA1的信号范围内, 通知 PC1将网关修 改成 SA1的地址;
如果 a、 b值有效, 则说明 AP在 SA1和 SA2的信号范围内, 通知 PC1将 网关修改成 SA2的地址;
如果 b、 c值有效, 则说明 AP在 SA2和 SA3的信号范围内, 通知 PC1将 网关修改成 SA3的地址;
如果有多台 SA, 以此类推, 正常情况下得到的有效值数目小于等于 2。 如某台 SA出现故障, 因为上述所说的程序是轮询执行, 当移动 AP走出 这个故障 SA的信号范围时, 也会自动恢复, 不会死机。
在本发明的实施例中, 两台机器之间利用 0PC接口互相传递数据, 编程 环境是 VB (Visual BASIC) , 利用微软提供的 API函数, 修改网关后是立即生 效的, 不需要重启。
本发明的技术方案用于道路、 铁路的车辆监控***中。 在一个实施例中, SA—般固定安装于道路、铁路沿线, 可用 17db的定向天线加 2公分器朝两个 方向射,直线距离每 2公里放一个 SA,转弯处等地方 500〜1500米放一个 SA, 即可保证信号覆盖。 以 100公里时速计算, 28米 /秒, 在利用 Datalinc 810E+ 产品作为 SA的实施例中, 信号覆盖范围至少是 2公里, 效果非常好。
本发明的技术方案主要应用于铁路车厢内应急监控, 列车与列车间的进 行距离通常超过 1个 SA的信号范围, 而利用公路铁路现有的电话网 MODEM拨 号后集中在监控中心, 目前新的高速、 铁路已经建有光纤网络的接口, 可以 直接使用。因此在同一条沿线可以存在多个 AP,例如每个车辆内安装一个 AP。 这些 AP可以具有相同的服务集标识符 (SSID) , 或者具有不同的 SSID, 在后一 种情况下, 需要对一组终端设备例如 SA1、 SA2、 一SA3中的 AP SSID作相应 修改。 如果考虑到两个方向都需要监控, 布署 2套终端设备即可。
当将本发明使用无线局域网的移动通信***应用于车厢内应急监控时, 可将计算机 PC1和无线 AP安装在车厢内。 作为视频采集及处理装置, 计算机 PC1中安装有负责视频编码的网络视频卡,通过至少一个摄像头采集车厢内的 实时视频图像, 并通过无线 AP、 终端设备和交换机将视频信号传送给计算机 PC20 计算机 PC2可作为中央监控主机, 其中安装有视频解码软件, 以便对接 收到的视频信号进行解码处理, 并在与中央监控主机相连的显示装置上显示 出车厢内的实时视频图像及将图像数据存储在中央监控主机的存储装置中。
本方案采用的无线设备, 价格低, 如采用国产产品, 考虑进天线-馈线系 统后一个 SA站的成本也只是千元级的。
Claims
1、 一种使用无线局域网的移动通信***, 包括一个无线接入点和多个终 端设备, 其特征在于, 所述无线接入点为移动式无线接入点, 所述多个终端 设备位置固定并按预定间隔距离布署, 所述无线接入点在移动过程中基于链 路层信号强弱指示选择多个终端设备中可用的终端设备建立通信连接。
2、根据权利要求 1所述的使用无线局域网的移动通信***,其特征在于, 所述无线局域网遵循 IEEE 802. 11协议。
3、根据权利要求 1所述的使用无线局域网的移动通信***,其特征在于, 所述预定间隔距离使得相邻两个所述终端设备的信号覆盖范围至少部分重 叠。
4、 一种使用无线局域网的车辆监控***, 其特征在于, 包括一个安装在 车辆中的无线接入点、 沿车辆行驶路线按预定间隔距离布署的位置固定的多 个终端设备、 以及通过交换机与所述多个终端设备相连的中央监控主机; 所 述无线接入点与至少一个视频采集及处理装置相连, 所述无线接入点在移动 过程中基于链路层信号强弱指示选择可用的终端设备建立通信连接; 所述中 央监控主机以监测到的可用终端设备作为缺省网关来保持与所述视频采集及 处理装置的通信连接。
5、根据权利要求 4所述的使用无线局域网的车辆监控***,其特征在于, 所述无线局域网遵循 IEEE 802. 11协议。
6、根据权利要求 4所述的使用无线局域网的车辆监控***,其特征在于, 所述预定间隔距离使得相邻两个终端设备的信号覆盖范围至少部分重叠。
7、根据权利要求 4至 6中任一项所述的使用无线局域网的车辆监控***, 其特征在于, 所述中央监控主机是安装有视频解码软件和 /或硬件的计算机, 所述视频采集及处理装置包括网络视频卡及与其相连的至少一个摄像头。
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9479999B2 (en) | 2011-12-20 | 2016-10-25 | Huawei Technologies Co., Ltd. | Vehicular communication method, device and system |
CN107333274A (zh) * | 2017-07-03 | 2017-11-07 | 铂元智能科技(北京)有限公司 | 无线传输*** |
CN111552224A (zh) * | 2020-04-24 | 2020-08-18 | 天府重工有限公司 | 多台垂直螺旋卸车机、清车机同时工作的全自动控制*** |
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US9479999B2 (en) | 2011-12-20 | 2016-10-25 | Huawei Technologies Co., Ltd. | Vehicular communication method, device and system |
CN107333274A (zh) * | 2017-07-03 | 2017-11-07 | 铂元智能科技(北京)有限公司 | 无线传输*** |
CN107333274B (zh) * | 2017-07-03 | 2023-09-05 | 铂元智能科技(北京)有限公司 | 无线传输*** |
CN111552224A (zh) * | 2020-04-24 | 2020-08-18 | 天府重工有限公司 | 多台垂直螺旋卸车机、清车机同时工作的全自动控制*** |
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