In intelligent transportation, improve wireless communication system and the method for vehicle-mounted node recognition rateTechnical field
The present invention relates to intelligent transportation wireless communication field, particularly relate to a kind of wireless communication system and method that improves vehicle-mounted node recognition rate.
Background technology
Wireless communication field at municipal intelligent traffic, in urban environment, wireless communications environment is very complicated, between communication node, have a large amount of barriers, and these barriers can cause scattering, refraction and the reflection of wireless signal, thereby decline because multipath effect causes signal quality.In addition along with a large amount of uses of the wireless communication technologys such as WIFI in city, must make to exist in urban environment a large amount of electromagnetic interference, the internodal communication link of these electromagnetic interference meeting severe jammings, cause the appearance of the situations such as interrupted communication link, and in-vehicle wireless communication device is in mobile status, the proper communication that the vehicle-mounted node (OBU) of avenrage of withdrawal side gusset (RSU) network coverage can have been failed with trackside node (RSU) due to the impact of electromagnetic interference.
And conventionally when disposing trackside node, need by equipment such as Spectrum Analyzers, survey on-the-spot electromagnetic interference situation, by the exploration result of spectrum measurement instrument, select the less frequency range of frequency range electromagnetic interference as its working frequency range, and along with a large amount of uses of wireless communication technology, the comparatively clean channel of frequency range now, after a period of time, may there is a large amount of electromagnetic interference in it, thereby affect communicating by letter of trackside node and vehicle-mounted node, affect normal communication interaction flow process.Therefore, designing a kind of wireless communication system that improves vehicle-mounted node recognition rate in intelligent transportation has great importance for the reliability that increases inter-node communication.
Summary of the invention
The object of the invention is, in order to solve the problem of city electromagnetic interference on Reliability of Wireless Communication impact between bus or train route, to propose to improve in a kind of intelligent transportation wireless communication system and the method for vehicle-mounted node recognition rate.
The object of the invention is to be achieved through the following technical solutions: in a kind of intelligent transportation, improve the wireless communication system of vehicle-mounted node recognition rate, this system comprises m trackside node and n vehicle-mounted node; Described trackside node comprises RSU RF communication module and RSU power supply unit; Described vehicle-mounted node comprises OBU RF communication module and OBU power supply unit; The OBU RF communication module of the RSU RF communication module of described trackside node and vehicle-mounted node communicates by microwave wireless signal; Described RSU power supply unit is the power supply of RSU RF communication module; OBU power supply unit is the power supply of OBU RF communication module; M trackside node is operated in respectively m different channel; Each vehicle-mounted node is successively to m channel sending node information packet.
Further, described RSU RF communication module and OBU RF communication module are the SOC of integrated MCU+ radio-frequency (RF) transceiver, or independent MCU+ radio-frequency (RF) transceiver.
Utilize described wireless communication system to improve a method for vehicle-mounted node recognition rate, comprise the following steps:
(1) in operational environment, dispose m trackside node, between m trackside node and n vehicle-mounted node, have visual communication channel, m trackside node is operated in respectively m different channel, and wherein, m is greater than 2 natural number, and n is for needing the vehicle number of identification;
(2) n vehicle-mounted node is in real time successively to m channel sending node information packet, and nodal information packet contains vehicle-mounted address of node information;
(3) m trackside node receives the nodal information packet of its transmission to entering n vehicle-mounted node of its network coverage, extracts vehicle-mounted address of node information, thereby completes the identification to vehicle-mounted node.
The invention has the beneficial effects as follows: the present invention can be in the situation that vehicle-mounted node add trackside node to set up network, complete the radio communication with trackside node, and by being operated in the trackside node of different channels, the impact of the reliability that minimizing city electromagnetic interference is communicated by letter with trackside node wireless on vehicle-mounted node, improves vehicle-mounted node by the possibility of trackside node recognition.
Accompanying drawing explanation
Fig. 1 is the wireless communication system theory diagram of the vehicle-mounted node recognition rate of raising of the present invention;
Fig. 2 is the theory diagram of trackside node of the present invention (RSU);
Fig. 3 is the theory diagram of vehicle-mounted node of the present invention (OBU);
Fig. 4 is the flow chart of the wireless communications method of the vehicle-mounted node recognition rate of the raising described in the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment one: as shown in Figure 1, the wireless communication system of the vehicle-mounted discrimination of raising of the present invention, comprising: m trackside node (RSU) 1 and n vehicle-mounted node (OBU) 2;
As shown in Figure 2, described trackside node (RSU) 1 comprises RSU RF communication module 1-1, RSU power supply unit 1-2; M trackside node (RSU) is operated in respectively m different channel;
As shown in Figure 3, described vehicle-mounted node (OBU) 2, comprises OBU RF communication module 2-1, OBU power supply unit 2-2; Each vehicle-mounted node (OBU) is successively to m channel sending node information packet.
The OBU RF communication module 2-1 of described vehicle-mounted node (OBU) completes bus or train route with the RSU RF communication module 1-1 of trackside node (RSU) by microwave wireless signal and communicates by letter.
Wherein, described RSU power supply unit 1-2 provides working power for RSU RF communication module 1-1; OBU power supply unit 2-2 provides working power for OBU RF communication module 2-1.
As shown in Figure 4, the wireless communications method of the vehicle-mounted node recognition rate of raising of the present invention, comprises the following steps:
S1: at m the trackside node of portal frame deploy (RSU) 1 that is highly H, the working channel of each trackside node is different respectively;
S2:n vehicle-mounted node (OBU) 2 sends vehicle-mounted nodal information to m working channel in real time successively;
N the vehicle-mounted node (OBU) 2 that 1 pair of S3:m trackside node (RSU) enters its network coverage receives the nodal information packet of its transmission, thereby completes the identification to vehicle-mounted node (OBU) 2.
Wherein, the height that m trackside node (RSU) 1 is installed on portal frame is H, and this height trackside node (RSU) 1 has large as far as possible visible angle with vehicle-mounted node (OBU) 2.
Embodiment two: present embodiment is described further execution mode one, described RSU power supply unit 1-2 adopts the direct current of civil power conversion, or powered battery, or adopts solar powered; Described OBU power supply unit 2-2 adopts powered battery or Vehicular direct-current power supply.
Embodiment three: present embodiment is described further execution mode one, described RSU RF communication module and its hardware structure of OBU RF communication module can be the SOC of integrated MCU+ radio-frequency (RF) transceiver, or independent MCU+ radio-frequency (RF) transceiver.
Above execution mode is only for illustrating the present invention; but not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.