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Switching method, system and wireless network card for vehicle-mounted communication

A technology of wireless network card and vehicle-mounted communication, applied in the field of communication, can solve the problems of prolonging and adding hardware equipment during handover, and achieve the effect of short delay

Active Publication Date: 2011-10-05
ZTE ITS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Embodiments of the present invention provide a switching method, system, and wireless network card for vehicle communication, which are used to solve the problems in the prior art that the switching delay is long or hardware devices need to be added when switching vehicle communication

Method used

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  • Switching method, system and wireless network card for vehicle-mounted communication
  • Switching method, system and wireless network card for vehicle-mounted communication
  • Switching method, system and wireless network card for vehicle-mounted communication

Examples

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Embodiment 2

[0047] An embodiment of the present invention provides a switching system for in-vehicle communication, such as figure 2 As shown, the system includes: a wireless network card 11 arranged in the train, a control module 12 and a plurality of wireless access points 13 arranged on the side of the track, wherein: the wireless network 11 is used to communicate with the side of the track through the first STA port A wireless access point connected to another wireless access point through the second STA port, and when receiving the disconnection instruction information sent by the control module 12 for a STA port, disconnect the indicated STA port from the The connection of the wireless access point, wherein: the resources occupied when connecting to the wireless access point through the first STA port and the resources occupied when connecting to the wireless access point through the second STA port are allocated by time division multiplexing; Module 12 is used to compare the signa...

Embodiment 3

[0054] The scheme of the embodiment of the present invention is described below through a specific example, as Figure 3(a) ~ Figure 3(d) As shown, it is a schematic diagram of the switching of the train during operation, and the switching process is as follows:

[0055] Step 1: When the train starts to start, the train is in the area covered by AP_1, as shown in Figure 3(a). At this time, the wireless network card on the train establishes a connection with AP_1 through STA_1 and performs data communication.

[0056] Step 2: As the train moves, the train enters the area covered by AP_1 and AP_2, as shown in Figure 3(b). At this time, when the wireless network card establishes a connection and communicates with AP_1 through STA_1, the wireless network card passes through STA_2 connects with AP_2.

[0057] At this time, the control module on the train needs to compare the signal strengths of AP_1 and AP_2 detected by the current wireless network card. Assume that the signal str...

Embodiment 4

[0063] Embodiment 4 of the present invention also provides a wireless network card applied in a vehicle communication system, such as Figure 4 As shown, the wireless network card includes a first connection module 21, a second connection module 22, a receiving module 23 and a disconnection module 24, wherein: the first connection module 21 is used to communicate with the trackside through the STA port of the first wireless receiving device A wireless access point connection; the second connection module 22 is used to connect to another wireless access point through the second STA port, wherein: the resources occupied when connecting to the wireless access point through the first STA port are the same as those used by the second STA port The resource occupied when the port is connected to the wireless access point is allocated in a time-division multiplexing manner; the receiving module 23 is used to receive disconnection indication information for a STA port, wherein: the wire...

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Abstract

The invention discloses a switching method, a system and a wireless network card for vehicle-mounted communication. The method comprises the following steps that: a physical wireless network card is changed into a virtual wireless network card which communicates with two access points (APs) through two statistic timing analyzer (STA) ports in a time division multiplex manner, so the switching between one physical wireless network card and two APs is realized. In the embodiment scheme of the invention, additional hardware equipment is not required, and a generated switching time delay is not a physical time delay but only a time delay related with the processing ability of the wireless network card, so the generated time delay is very short and data dropout and communication interrupt are avoided.

Description

technical field [0001] The invention relates to the communication field, in particular to a switching method, system and wireless network card for vehicle communication. Background technique [0002] With the development of communication technology, especially radio technology, people began to study the rail transit system based on communication technology, especially the communication-based train control system (communication-based train control system, CBTC). [0003] CBTC uses wireless communication media instead of track circuits to realize two-way communication between the train and the ground control station, so as to achieve the purpose of controlling the train operation. The outstanding advantage of CBTC is to realize the two-way communication between the train and the ground control station, the transmission of large amount of information, the transmission speed is fast, it is easy to realize the mobile automatic blocking system, greatly reduce the laying of cables ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08H04W36/30
Inventor 贾琳刘凯
Owner ZTE ITS CO LTD
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