CN102611719A - Vehicle-mounted MOST (Media Oriented Systems Transport) network system - Google Patents

Vehicle-mounted MOST (Media Oriented Systems Transport) network system Download PDF

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CN102611719A
CN102611719A CN201110024170XA CN201110024170A CN102611719A CN 102611719 A CN102611719 A CN 102611719A CN 201110024170X A CN201110024170X A CN 201110024170XA CN 201110024170 A CN201110024170 A CN 201110024170A CN 102611719 A CN102611719 A CN 102611719A
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network
vehicle
controller
node
bridger
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CN102611719B (en
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陈国保
莫天德
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Hongkong Productivity Promotion Bureau Of China
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Automotive Parts and Accessory Systems R&D Centre Ltd
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Abstract

The invention provides a vehicle-mounted MOST (Media Oriented Systems Transport) network system. The system comprises at least two vehicle-mounted MOST networks, at least one bridge and a flow media data packaging module, wherein each vehicle-mounted MOST network comprises a plurality of nodes; the bridge is used for connecting the vehicle-mounted MOST networks; the flow media data packaging module is used for packaging a program flow which is requested by a user through a video into a program flow module group; each node comprises a timing monitor, a main controller and an MOST network controller; the timing monitor is connected with the main controller and the MOST network controller, and is used for monitoring the main controller and the MOST network controller; and when the main controller or the MOST network controller breaks down, the main controller is controlled to enter a skipping mode. The vehicle-mounted MOST network system provided by the invention expands the existing MOST network and can defend network faults; and flow media data is packaged and transmitted, so that the transmission process of the program flow in a network is simplified and transmission channels are reduced.

Description

A kind of vehicle-mounted MOST network system
Technical field
The invention relates to medium orientation system transmission (Media Oriented Systems TransportMOST) technology, especially about a kind of vehicle-mounted MOST network system.
Background technology
The MOST network mainly is responsible for the transfer of data of on-vehicle information amusement and remote information equipment as a kind of vehicle mounted multimedia network-bus, and MOST network utilisation optical fiber transmits entertainment information as transmission medium with ring topology.Fig. 1 is existing MOST network architecture block diagram, and is as shown in Figure 1, and the MOST network can have 64 nodes at most; 64 receiving terminals of promptly maximum series connection; Be installed on mass transit carrier, supply every user to choose different separately amusements, limited the extensibility of network configuration.
Main frame in whole network system as the platform of collecting, integrate, provide all information.Main frame is earlier collected different entertainment information, according to the requirement of each receiving terminal relevant information is packaged into the MediaLB form, and converting thereof into optical signalling again will transmit on the MOST network.Receiving terminal is user's a man-machine interface, and the user proposes relevant information requirement to main frame, and on the MOST network, extracts through receiving terminal, and at the information deblocking of receiving terminal with the MediaLB form, and output is at the display of receiving terminal.Whole system can arbitrarily increase and decrease node in response to the receiving terminal of varying number, and when newly-increased or minimizing node, main frame can distribute the address/numbering of receiving terminal on the MOST network automatically in order, to discern each information requirement from which platform receiving terminal.Propose different entertainment information in response to different receiving terminals in the same time, a large amount of frequency ranges of network demand utilize optical fiber transmission technique, can transmit a large amount of different entertainment information in real time.
As shown in Figure 1; Each node is responsible for transmission information to next node in the MOST network; If middle arbitrary node failure, failure node just can't communicate information to next node, and for example node 3 breaks down; Malfunctioning node 3 just can not communicate information to next node 4, and whole M OST network will leave operating state and be in paralyzed state.On the existing MOST network design and incompatible other popular automotive networking system such as CAN Bus, LIN Bus.If above automobile, the MOST network information can not be communicated by letter with CAN or LIN the MOST network application.
In addition, existing in-car TV solution generally is to utilize the antenna received RF signal, after radio frequency low noise amplifier and more powerful amplifier reinforcement signal strength signal intensity, is sent to the extension set at each seat again.The RF front-end circuit of each extension set can independently carry out demodulation and decoding.But if the in-car TV program all is provided, need use tens pieces of RF front-end circuits to each user on the mass transit carrier, and a powerful amplifier, hardware cost is high.
Have, traditional auto-navigation system need be installed a gps receiver again, calculates current coordinate position behind the reception GPS wireless signal, shows the road information in relevant area again according to the storing map of receiving terminal.But if to each user on the mass transit carrier GPS is provided all, need use tens gps receivers, hardware cost is high.
In a word, existing MOST network, extensibility is limited, and the fault defence capability is low, can't communicate with other automotive networking system.If in-car TV and GPS location all are provided to each user on the mass transit carrier, with high costs.
Summary of the invention
The present invention provides a kind of vehicle-mounted MOST network system, expands existing MOST network, simplifies the transmission course of program stream in network, and the defending against network fault improves network stabilization.
To achieve these goals, the present invention provides a kind of vehicle-mounted MOST network system, and this system comprises: at least two vehicle-mounted MOST networks, and each described vehicle-mounted MOST network comprises a plurality of nodes; At least one bridger is used to connect described vehicle-mounted MOST network; The stream medium data packetization module is used for Streaming Media is packaged as program stream piece group, realizes the function of video request program; Wherein, Each said node comprises a timing watch-dog, a master controller and a MOST network controller; Said timing watch-dog connects described master controller and MOST network controller; Be used to monitor said master controller and MOST network controller, when said master controller or MOST network controller break down, control said master controller and get into the pattern that skips over.
Beneficial effect of the present invention is: the present invention has strengthened the autgmentability of conventional MOS T network through the design bridger; To the stream medium data transmission of packing, simplified the transmission course of program stream in network; Through program stream is packed, reduced transmission channel, realize the feasibility of video request program; Can the defending against network fault, improve network stabilization; Can send information according to user's request; Reduce the quantity of hardware, thereby saved cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is existing MOST network architecture block diagram;
The structured flowchart of the vehicle-mounted MOST network system of Fig. 2 embodiment of the invention;
But Fig. 3 embodiment of the invention diffused mos T network architecture sketch map figure;
But Fig. 4 another embodiment of the present invention diffused mos T network architecture sketch map;
But Fig. 5 is the receiving terminal composition sketch map partly at main frame and node place in the diffused mos T network architecture place onboard system of the vehicle-mounted MOST network system of present embodiment;
But Fig. 6 is further embodiment of this invention diffused mos T network diagram;
Fig. 7 is the structure and the annexation sketch map of embodiment of the invention bridger;
The structured flowchart of the vehicle-mounted MOST network system of Fig. 8 another embodiment of the present invention;
Fig. 9 is packing of embodiment of the invention program stream piece group and transmission sketch map;
The structural representation of timing watch-dog in Figure 10 embodiment of the invention node;
Figure 11 embodiment of the invention node gets into the sketch map of the pattern that skips over;
Figure 12 is that embodiment of the invention user's hobby is collected sketch map;
Figure 13 is embodiment of the invention advertising message distribution sketch map.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, the embodiment of the invention is explained further details below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as to qualification of the present invention.
As shown in Figure 2, the vehicle-mounted MOST network system of present embodiment comprises: at least two vehicle-mounted MOST networks 201, at least one bridger 202 and stream medium data packetization module 203.Wherein, each vehicle-mounted MOST network 201 comprises a plurality of nodes, like the node among Fig. 1; Bridger 202 connects described vehicle-mounted MOST network; Stream medium data packetization module 203 is packaged as program stream piece group with the program stream piece of user's program request.
As shown in Figure 3, but the framework of being made up of at least two vehicle-mounted MOST networks and at least one bridger can be called the diffused mos T network architecture, and each described vehicle-mounted MOST network comprises a plurality of nodes, (64 nodes can be arranged at most).
But the diffused mos T network architecture can comprise MOST25 network and/or MOST150 network; For example the MOST1 network among Fig. 2 is the MOST25 network; The MOST2 network is the MOST150 network, also can the MOST1 network and the MOST2 network all be the MOST25 network or all be the MOST150 network.Bridger can be the MOST network bridging of different size together.The network architecture of present embodiment can effectively be itself to use the MOST network to increase new MOST specification node, and for example MOST25 and MOST150 can use by bridge joint together, will not change in the lump by original network.
Bridger is regarded as a node in the MOST network. and the software design of bridger need be message packet in the package of MOST.
Said bridger comprises: at least two MOST INIC interfaces and controller, said MOST INIC interface utilizes MediaLB and I2C transfer control signal, message packet and synchronizing signal.Comprise destination address mark in the described message packet, controller can be transferred to destination address with described message packet according to the destination address mark of said message packet.
The MOST network is originally as a ring-type synchronizing network (Ring synchronous network).Each node all can pass to next node to synchronizing signal in the network. and " bridger 1 " can connect two MOST Ring extended network.The present invention can break through a MOST network down in itself 64 nodes limitation and limit; The MOST network can not stop expanding node; 2 MOST networks only are shown among Fig. 2, the invention is not restricted to this, those skilled in the art can know; The present invention can be connected to a plurality of MOST networks through bridger, and is as shown in Figure 4.
In the framework of the MOST of Fig. 3 network, even the node failure in the ring-type synchronizing network can not let the whole network architecture lose efficacy yet, the network architecture still can be kept certain network function, and the MOST stability of network is improved.
MOST network on the right of the bridger of Fig. 3 is connected to the MOST network on the left side can reduce half to the risk that whole network pauses, and for example, when the MOST on the right network node lost efficacy, can not influence left side MOST network.The network architecture among Fig. 3 safeguards that more easily when stopping fixed running like whole network part, other partly still can be worked, and the user can inquire any one node that goes wrong, and the detection of MOST network and maintenance can be easier.
Fig. 5 is the composition sketch map of present embodiment based on the receiving terminal part at main frame and node place in a scalable network framework place onboard system of vehicle-mounted MOST network; As shown in Figure 5; The MOST network transmits information with optical fiber can promote information capacity in a large number; Onboard system can receive and provide multiple different Infotainment, comprises audio input interface, audio-visual input interface (like DVD player), external hard disk machine, USB storage device, SD card, radio signals and television broadcasting signal etc.
Embodiment two
As shown in Figure 6, but the diffused mos T network architecture can also comprise: and the vehicle-mounted CAN network is connected with described MOST network through described bridger; Vehicle-mounted LIN network is connected with described MOST network through described bridger.
As shown in Figure 7, said bridger comprises: at least two MOST INIC interfaces and controller, said MOST INIC interface utilizes MediaLB and I2C transfer control signal, message packet and synchronizing signal.Comprise destination address mark in the described message packet, controller can be transferred to destination address with described message packet according to the destination address mark of said message packet.Controller decision message packet in the bridger is communicated to different purpose ground, MOST for example, and CAN, LIN, this controller can be connected the MOST network with other network standard under MOST definition standard.
In the framework of the MOST of Fig. 6 network, even the node failure in the ring-type synchronizing network can not let the whole network architecture lose efficacy yet, the network architecture still can be kept certain network function, and the MOST stability of network is improved.
The bridger of Fig. 6 links together the MOST network on the left side, the MOST network on the right, following vehicle-mounted CAN network and vehicle-mounted LIN network; Can reduce the risk that whole network pauses; For example; When the MOST on the right network node lost efficacy, can not influence the vehicle-mounted CAN network and the vehicle-mounted LIN network of left side MOST network, bottom.The network architecture among Fig. 6 safeguards that more easily when stopping fixed running like whole network part, other part still can be worked, and the user can inquire any one node that goes wrong, and the detection of MOST network and maintenance can be easier.
As shown in Figure 8, vehicle-mounted MOST network system can also comprise: program stream piece group transport module 1001, data collection module 1002, data distribution module 1003, at least one radio-frequency front-end device 1004 and a gps receiver 1005.
Wherein, program stream piece group transport module 1001 arrives said node with the program stream piece group of stream medium data packetization module 203 packings through same channel transfer.Under the prerequisite that guarantees the Network Transmission bandwidth, in order to simplify the transmission of program stream in network, the present invention adopts the technology of repacking (Data re-packeting on harddisc streaming for video-on-demandapplication) of the hard disk stream medium data of video request program; With the Media Stream in the storage medium; According to broadcast request, piecemeal adds broadcast information again; After reconfiguring packing again, in transmission through network.Like this, can reduce transmission channel, make full use of the network bandwidth, simplify transmission course.
Program stream piece group should satisfy the following formula requirement:
Σ i = 0 n ( Npkg i × ( Bpkg + Pid i ) ) ≤ ( BW × T )
Wherein, T is the program stream transmission intercal, and BW is the network bandwidth, and n is the number of users in the network, and Npkg is the program block number that each user requires at time interval T, and Bpkg is the length (this numerical value is constant) of the program block of customer requirements, and Pid is a user profile length.
Concrete realization instance is shown in Figure 9.In this instance, three user's program requests two program streams in the broadcast nodes, wherein user 1 with user's 3 program requests same program, but because the program request temporal differences, at interval, user 1 requires different pieces with user 3 at one time.The stream medium data packetization module 203 of broadcast nodes adds piece in the program stream 11 and piece 2 respectively user 1 and user's 3 information; And with the piece 3 that adds in the program stream 2 of user's 2 information; New program stream piece group is formed in packing together, through program stream piece group transport module 1001 this program stream piece group is used same channel transfer in network again.The user then through confirming user profile, receives the piece of oneself, ignores other users' piece.Instance is visible thus, and the present invention can utilize same passage to transmit a plurality of users' program block simultaneously through piecemeal reorganization program stream.
Shown in figure 10; Each node comprises a timing watch-dog 301, a master controller 302 and a MOST network controller 303; Regularly watch-dog 301 connects master controller 302 and MOST network controller 303; Real-time and master controller 302 transmits signals, confirms whether master controller 302 and MOST network controller 303 work under normal condition.Shown in figure 11, when timing watch-dog 301 finds that master controllers or MOST network controller break down, control said master controller and get into the pattern that skips over, optical signalling complete be replicated in output.
Data collection module 1002 is collected the preference information that the user chooses through node, and according to said preference information said user is classified; Data distribution module 1003 sends corresponding preference information to sorted users.The vehicle-mounted MOST network system of present embodiment has two-way data transmission capabilities, and the hard disk playing function of its main frame can be selected with different " channel " grantings different classes of film and information to user side.As long as it is, just can comprehensively go out the hobby of a certain particular demographic, thereby promote targetedly, shown in figure 12 user's selection record and analysis.
Because the vehicle-mounted MOST network system of present embodiment can be installed on the mass transportation facilities; So groups of users can be classified to take advantage of specific vehicle route even the period of seat; The repeatability of this classification tool height; Can take advantage of the vehicle of same period of seat and same route every day such as working people; The hobby that therefore can out and outly reflect this group in the collected data of a certain route, rather than with statistical method projection and estimated result, so the effect when this particular course propaganda can promote relatively.
The relative traditional media innovative point of vehicle-mounted MOST network system of present embodiment is that itself is the instrument of a data collection; It also is a good instrument of propaganda; Can in fixed route and time relevant information be provided through advertisement, shown in figure 13, the customer group sorting technique is also the same when collecting data can be with period and route division; Can only compare with dividing time-steps with the advertisement of conventional television broadcast, possess significant advantage.
For example native system is installed on the Tour Bus in one group of contact Hong Kong and Huizhou; Then the travel information of country variant is written into hard disc and broadcasts, through behind the record of several months, just can find with these often this group in contact Hong Kong and Huizhou possibly like travelling to country in Southeast Asia; Thereby propagate targetedly; Comprise and promote its tourism auxiliary facility, travel party, hotel etc.
Radio-frequency front-end device 1004 can be collected a plurality of TV programme, is converted into the MPEG-TS crossfire through after tuning, the channel-decoded machine demodulation, then via the MOST net distribution to each node.The radio-frequency front-end device comprises: radio-frequency tuner, channel decoder and demodulator.
Traditional in-car TV solution is to utilize the antenna received RF signal, after radio frequency low noise amplifier and more powerful amplifier reinforcement signal strength signal intensity, is sent to the extension set at each seat again through copper axis signal line.The RF front-end circuit of each extension set can independently carry out tuning and decoding.But if the in-car TV program all is provided, need use tens pieces of RF front-end circuits to each user on the mass transit carrier, and a powerful amplifier, hardware cost is high.
Let every user can select the TV programme of oneself liking in order to reach with minimum cost and minimum space and weight; The onboard system of this enforcement does not need powerful radio frequency amplifier, provides digital television signal to a plurality of receiving terminals with the radio-frequency front-end device 1004 (comprising radio-frequency tuner and channel decoder and demodulator) of smallest number.The onboard system of present embodiment is collected a plurality of TV programme with two groups of radio-frequency front-end devices; After tuning/channel-decoded and demodulation, change and turn to the MPEG-TS stream format; Need to each on receiving terminal of TV reception via the MOST net distribution, the TV programme of on receiving terminal, selecting then to be comprised in the MPEG-TS crossfire are to decode and to play again.
Gps receiver 1005 can obtain positional information, with said positional information boil down to MPEG-TS crossfire, and through the MOST network said MPEG-TS crossfire is distributed to each node.
Traditional auto-navigation system need be installed a gps receiver on receiving terminal, calculate current coordinate position behind the reception GPS wireless signal, again through the storing map of receiving terminal, shows the road information in relevant area.
But if to each user on the mass transit carrier GPS is provided all, need use tens gps receivers, hardware cost is high.And be not that each user is interested in to see current coordinate position, service efficiency is very low.So the present invention proposes a kind of scheme, a gps receiver and map only are installed on the car machine, the road information of will being correlated with then is compressed into the MPEG-TS crossfire, arrives each user side via the MOST network propulsion again.The receiving terminal end only need use the mpeg decoder of self to understand the MPEG-TS crossfire, and the user just can obtain road information, lowers the cost of system greatly.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. vehicle-mounted MOST network system is characterized in that described system comprises:
At least two vehicle-mounted MOST networks, each described vehicle-mounted MOST network comprises a plurality of nodes;
At least one bridger is used to connect described vehicle-mounted MOST network;
The stream medium data packetization module is used for Streaming Media is packaged as program stream piece group, realizes the function of video request program;
Wherein, Each said node comprises a timing watch-dog, a master controller and a MOST network controller; Said timing watch-dog connects described master controller and MOST network controller; Be used to monitor said master controller and MOST network controller, when said master controller or MOST network controller break down, control said master controller and get into the pattern that skips over.
2. the system of claim 1 is characterized in that, described vehicle-mounted MOST network is MOST25 network and/or MOST150 network.
3. the system of claim 1 is characterized in that, the described network architecture also comprises:
The vehicle-mounted CAN network is connected with described MOST network through described bridger.
4. the system of claim 1 is characterized in that, the described network architecture also comprises:
Vehicle-mounted LIN network is connected with described MOST network through described bridger.
5. want 1 or 2 or 3 or 4 described systems like right, it is characterized in that described bridger comprises:
At least two MOST INIC interfaces, said MOST INIC interface utilizes MediaLB and I2C transfer control signal, message packet and synchronizing signal.
6. system as claimed in claim 5 is characterized in that, comprises destination address mark in the described message packet.
7. system as claimed in claim 6 is characterized in that, said bridger also comprises:
Controller is used for according to the destination address mark of said message packet described message packet being transferred to destination address.
8. the system of claim 1 is characterized in that, described system also comprises: program stream piece group transport module is used for said program stream piece group is arrived said node through same channel transfer.
9. the system of claim 1 is characterized in that, described system also comprises:
Data collection module is used to collect the preference information that the user chooses through node, and according to said preference information said user is classified;
The data distribution module is used for sending corresponding preference information to sorted users.
10. the system of claim 1 is characterized in that, described system also comprises:
At least one radio-frequency front-end device is used to collect a plurality of TV programme, is converted into the MPEG-TS crossfire through after tuning, the channel-decoded machine demodulation, then via the MOST net distribution to each node.
11. system as claimed in claim 10 is characterized in that, described radio-frequency front-end device comprises: radio-frequency tuner, channel decoder and demodulator.
12. the system of claim 1 is characterized in that, described system also comprises:
One gps receiver is used to obtain positional information, with said positional information boil down to MPEG-TS crossfire, arrives each node via the MOST net distribution then.
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CN103731694A (en) * 2013-11-29 2014-04-16 叶少甘 Vehicle-mounted satellite television broadcasting system and method based on MOST network
CN103731694B (en) * 2013-11-29 2018-05-01 叶少甘 A kind of Vehicular satellite television broadcasting system and method based on MOST networks
CN103716715A (en) * 2013-12-20 2014-04-09 叶少甘 Vehicle order system based on MOST fiber networks
CN104378666A (en) * 2014-11-05 2015-02-25 深圳市航盛电子股份有限公司 Audio/video encoding and decoding device based on MOST bus and method
GB2524170A (en) * 2015-02-23 2015-09-16 Daimler Ag Media oriented systems transport data communication network with radio communication for a motor vehicle and method for operating the same
WO2017128902A1 (en) * 2016-01-28 2017-08-03 叶少甘 Streaming media multicast system and method using multiple ring topology most networks
CN105656742A (en) * 2016-01-28 2016-06-08 叶少甘 Multi-looped network stream media multicast system and method based on MOST
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CN107026785A (en) * 2016-01-29 2017-08-08 叶少甘 A kind of LAN chat communication system based on MOST
CN110431808A (en) * 2017-05-23 2019-11-08 微芯片技术股份有限公司 CAN transmitter with quick CANL control loop
CN108989314A (en) * 2018-07-20 2018-12-11 北京木瓜移动科技股份有限公司 A kind of Transmitting Data Stream, processing method and processing device

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