CN100449993C - Multimedia information distribution system and multimedia traveling information distribution system - Google Patents
Multimedia information distribution system and multimedia traveling information distribution system Download PDFInfo
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- CN100449993C CN100449993C CNB2004100811309A CN200410081130A CN100449993C CN 100449993 C CN100449993 C CN 100449993C CN B2004100811309 A CNB2004100811309 A CN B2004100811309A CN 200410081130 A CN200410081130 A CN 200410081130A CN 100449993 C CN100449993 C CN 100449993C
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Abstract
The present invention provides a multimedia information publish system and a multimedia tour information publish system. A mobile communication terminal at least comprises a blue-tooth module and an operation interface, and is used for realizing multimedia service required by a terminal user. A database is used for storing the flow document multimedia information in the audio, video and text format. An access point at least comprises the blue-tooth module and a CPU, and is used for reporting thereof working state to the server, carrying out the access of the mobile communication terminal, applying to the server for a flow document list and flow documents and carrying out the information interaction with the mobile communication terminal. A server is used for downloading and uploading database documents, distributing the flow documents and the flow document list at the access point and carrying out judgement of the working state of the access point, operation at the access point and operation on the multimedia information. The invention utilizes the blue-tooth wireless communication technology to publish the multimedia information in the fields of medical treatment, shopping, tourism, etc.
Description
Technical Field
The invention belongs to a wireless communication technology and a Bluetooth technology, particularly relates to a multimedia information transmission system by utilizing the wireless communication technology and the Bluetooth technology, and particularly relates to a multimedia information release system and a multimedia tourism information release system.
Background
At present, the wireless communication technology is rapidly developed, mobile communication terminals including mobile phones are very popular, and especially, mobile phones are almost essential for people's life. Under the condition, various wireless value-added services emerge endlessly, and bring great convenience to the life of people.
However, the development of application technologies for multimedia information distribution by wireless communication is not well balanced, and in many places where multimedia information distribution technologies are urgently needed, such technologies do not exist in practice or even exist, such technologies are only limited to methods or systems with poor practicability, high cost, and the like. For example:
when people go to a hospital to see a doctor, people often need to know the relevant information of the hospital urgently. However, the prior art lacks ways to understand hospital information. Most hospitals issue information by means of manual consultation, screen prompt, identification establishment and the like. Obviously, this way of information distribution lacks interaction between the patient and the hospital, and the amount of information is narrow. Although some hospitals also adopt a local area network to provide information, the information is simply connected between the inquiry terminal and the hospital information server, and the interaction of inquiry according to the inquiry menu is not different from screen prompt.
When people go to a shopping mall to shop, people often need to know the relevant information of the shopping mall urgently. However, the prior art has not many ways for people to know the information of the shopping mall. Most markets distribute information by means of cable broadcasting, screen prompting, identification setting and the like. Obviously, the information publishing mode lacks interaction between consumers and merchants, and the information quantity is narrow.
The following steps are repeated: when people travel to a tourist place, people are more urgent and necessary to know and master the travel information. However, the existing travel information system mainly uses FM frequency modulation to broadcast information. The relatively backward wireless analog communication technology is adopted to realize that one point (such as a guide or a broadcasting station) transmits information and multiple points (generally earphone type receivers) receive the information simultaneously, and the wireless analog communication technology is similar to a frequency modulation radio. The disadvantages are mainly shown in that: the audio signal quality is low due to the lagging modulation mode; the information is difficult to update in time, and no multimedia information service exists; multi-language service support cannot be flexibly provided; the terminal equipment is clumsy and expensive; the user interface is poor, the participation is poor, and the autonomous visit and the flexible information acquisition can not be basically realized; personalized services for the guest cannot be provided. Although the application numbers are: 01110646.8 discloses a travel information distribution system to provide users with better travel information service. However, the system is complex in design, has more participants, is not beneficial to the flexible construction of the system, and is also not beneficial to the information release of the tourism scene.
To sum up, in the following cases: the technology for multimedia information release in fixed space ranges of hospitals, markets, tourist sites, museums, airports, stations and the like is still lagged behind, namely to be solved.
Bluetooth is a wireless network technology jointly introduced in 1998 by 5 companies like Ericsson and IBM. Bluetooth is an open standard for wireless data and voice transmission, and connects various communication devices, computers and their terminals, various digital data systems, and even household appliances in a wireless manner. The transmission distance is 10 m-100 m, and the transmission distance can reach 1000m if power is increased or some peripheral equipment is added. It uses 2.4GHz ISM frequency band and frequency modulation and frequency hopping technique, using directional error correction coding, ARQ, TDD and baseband protocol. The TDMA is 0.625 mus per slot and the baseband coincidence rate is 1 Mb/s. The bluetooth supports 64kb/s real-time voice transmission and data transmission, the voice coding is CVSD, the transmission power is 1mW, 2.5mW and 100mW, respectively, and a globally uniform 48-bit device identification code is used. Because the bluetooth adopts wireless interface to replace wired cable connection, has very strong portability to be applicable to multiple occasion, including this technique low power dissipation, little to the human body harm, use simple moreover, realize easily, so easily promote. The bluetooth technology has a wide application range, and can be widely applied to various data and voice devices in a local area network, such as PCs, dial-up networks, notebook computers, printers, fax machines, digital cameras, mobile phones, high-quality headsets, and the like. Typical environments in which bluetooth technology is applied are wireless office environments, the automotive industry, information appliances, medical equipment, and school education and factory automation.
Disclosure of Invention
The invention aims to provide a multimedia information release system and a multimedia tourism information release system. The Bluetooth wireless communication technology is applied to multimedia information release in the fields of medical treatment, shopping, tourism and the like. Through multi-user asynchronous access; a good human-computer interface; providing a selection of a multi-national language; high quality audio and video transmission; and high-quality multimedia information release is realized.
The technical scheme of the invention is as follows: a multimedia information distribution system comprising: the system comprises a mobile communication terminal, a plurality of access points, a server and a database;
the mobile communication terminal is coupled with the server through the access point, and the server is coupled with the database; wherein,
the mobile communication terminal at least comprises: the mobile communication terminal is used for realizing the multimedia service requested by the terminal user;
the database is as follows: for storing streaming file multimedia information including audio, video and text formats;
each access point of the plurality of access points includes at least: each access point is used for reporting the working state of the access point to the server, completing the access of the mobile communication terminal, realizing the request of a stream file list and a stream file to the server and completing the message interaction with the mobile communication terminal;
the plurality of access points form a Bluetooth short-distance communication network, and the mobile communication terminal can be switched between the two access points;
the server: the system is used for loading and unloading the database file; the issuing of the stream files (audio and video) and the stream file (audio and video) list of the access point; arbitration and operation (backup switching, roaming switching, reset restarting, etc.) of the working state of the access point; processing multimedia information; and, the server has a routing table for describing the proximity relationship among the plurality of access points and determining the next access point of the mobile communication terminal according to the proximity relationship among the access points.
Each access point of the plurality of access points comprises: CPU, program guide module (BOOT), Bluetooth module, power supply module and interface.
The CPU controls the program guide module to start an application program, allocates a free Winsock channel (Port ID, specifically refer to fig. 2), and waits for a mobile communication terminal to access on this channel;
after the mobile communication terminal is accessed, an independent thread is opened up for the mobile communication terminal to receive the Bluetooth command and play the stream file.
The mobile communication terminal is a Bluetooth mobile phone, or a PDA with a Bluetooth function, or a notebook computer, or a tablet computer.
The mobile communication terminal comprises a language selection module, a service selection module and a playing module; wherein,
a user obtains a played stream file list through menu operation of a language selection module; the mobile communication terminal receives the stream file list returned by the access point, the user selects the file to be played through the menu operation of the service selection module, and sends the stream file playing request message to the access point through the menu operation of the playing module.
The server is coupled with a workbench (workbench); the server provides a message interaction interface for the workbench; the server receives the operation command from the workbench, issues the operation command to the access point for execution, and reports the states of the access point and the database to the workbench for near-end maintenance; the server finishes the updating of database information and the upgrading maintenance of access point software;
the said working platform also provides TCP/IP remote program interface for checking or maintaining network operation condition through remote web page.
Each access point can access a plurality of mobile communication terminals; wherein, each access point is respectively connected with the server through a TCP/IP network.
The mobile communication terminal realizes the switching between the two access points based on the routing table.
When the TCP/IP network is congested, starting an Access Point (AP) local file system to continue to issue a streaming file for the mobile communication terminal; and when the TCP/IP network is recovered to be normal, the server continues to issue the streaming file for the mobile communication terminal.
The access point can be used as a main access point and a standby access point; when the main access point has permanent fault, the server arbitrates the standby access point of the main access point, and the standby access point continues to provide service for the mobile communication terminal.
The invention also provides a multimedia tourism information release system, which comprises: the system comprises a mobile communication terminal, a plurality of access points, a server and a database;
the mobile communication terminal is coupled with the server through the access point, and the server is coupled with the database; wherein,
the mobile communication terminal at least comprises: the mobile communication terminal is used for realizing the multimedia service requested by the terminal user;
the database is as follows: the system is used for storing the multimedia information of the stream file comprising a travel audio file, a travel video file and a text format;
each access point of the plurality of access points includes at least: each access point is used for reporting the working state of the access point to the server, completing the access of the mobile communication terminal, realizing the request of a stream file list and a stream file to the server and completing the message interaction with the mobile communication terminal;
the plurality of access points form a Bluetooth short-distance communication network, and the mobile communication terminal can be switched between the two access points;
the server: the system is used for loading and unloading the database file; the issuing of the stream files (audio and video) and the stream file (audio and video) list of the access point; arbitration and operation (backup switching, roaming switching, reset restarting, etc.) of the working state of the access point; processing multimedia information; and, the server has a routing table for describing the proximity relationship among the plurality of access points and determining the next access point of the mobile communication terminal according to the proximity relationship among the access points.
The invention has the beneficial effects that: the roaming technology based on the routing table can ensure that the next Bluetooth access point is successfully accessed in the shortest time, thereby ensuring the uninterrupted service. Compared with the general equipment search and service search, the access speed can be improved by 90s/2 s-45 times, and the current service is not terminated. When the access points are arranged in an actual indoor venue, the optimal layout is given according to the actual situation so as to ensure the highest roaming success rate.
The adoption of the streaming file uninterrupted transmission technology can relieve the short-time congestion condition brought to the network by multiple users and provide high-quality video and audio services for the clients. The actual measurement and calculation result shows that the service interruption rate is reduced to below 0.1 percent of the original rate.
By implementing the master-backup switching technology of the access point, the mean Time Between failures (mtbf) (mean Time Between failures) of the network can be 50000 hours, and the mean Time Between failures (mttr) (mean Time to repair) of the network can be 15 minutes.
Besides the advantages and effects brought by the keys, compared with the prior travel information system in a frequency modulation mode, the system has the following advantages and characteristics: multiple users can access asynchronously; a good human-computer interface; providing a selection of a multi-national language; high quality audio and video transmission; the information, the explanation and the video data of the system can be updated in real time, and the remote maintenance of the database can be realized; the central server can automatically draw a personnel distribution map and record personnel action routes, has a monitoring function, provides a user track route recording and personnel distribution statistical function, and provides data support for later network optimization and monitoring; the whole set of network can be seamlessly upgraded to a wireless local area network (broadband network), and the upgrading cost is low because only the access points of the wireless network are increased; the network security is high; the network stability is high, and the service master/standby conversion can be realized among the access points; the user can automatically switch service among a plurality of access points to realize the roaming function, thereby overcoming the limitation of short-distance communication of the Bluetooth technology; and various user terminal devices are supported, including a Bluetooth mobile phone, a palm computer, a tablet computer, a notebook computer and the like.
Drawings
FIG. 1 is a block diagram of the system architecture of the present invention;
fig. 2 is a block diagram of a protocol stack between an access point and a mobile communication terminal according to the present invention;
FIG. 3 is a block diagram of an access point architecture according to the present invention;
fig. 4 is a diagram illustrating an inter-ap roaming process according to the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings. The overall frame diagram of the system of the invention is shown in fig. 1, and mainly comprises the following modules: the system comprises a database (Data Base), a Server (Server), a workbench (Workstation), an Access Point (Access Point) and Terminal equipment (Terminal Device), and specifically completes the following functions: the mobile communication terminal at least comprises: the mobile communication terminal is used for realizing the multimedia service requested by the terminal user;
the database is as follows: for storing multimedia information;
the access point at least comprises: the access point is used for reporting the working state of the access point to the server, completing the access of the mobile communication terminal, requesting a file list and a stream file from the server and completing the message interaction with the mobile communication terminal;
the server: the system is used for loading and unloading the database file; issuing a list of streaming files (audio and video) and streaming files (audio and video) for the access point; arbitration and operation (backup switching, roaming switching, reset restarting, etc.) of the working state of the access point; multimedia information is processed.
The access point comprises: CPU, program guide module (BOOT), Bluetooth module, power supply module and interface. The CPU controls the program guide module to start an application program, allocates a free Winsock channel (Port ID, specifically refer to fig. 2), and waits for a mobile communication terminal to access on this channel; after the mobile communication terminal is accessed, an independent thread is opened up for the mobile communication terminal to receive the Bluetooth command and play the media file.
As shown in fig. 3, the overall framework diagram of the access point board is divided into five modules: the system comprises a power Supply module (Supply), a board Core module (Brd Core), a BOOT module (BOOT), an interface module (a super IO controller, a Bluetooth module and an NIC controller are combined into the interface module) and a Peripheral Connector module (Peripheral Connector).
The single board is designed as an embedded operating system, single 5V is used for supplying power, Windows CE.NET is operated, the typical power consumption of the system is 10W @5V, and the maximum power consumption is 15W.
And (3) developing environment: net, Windows ce;
developing a tool: platform Builder, eMbeded Visual C + +.
After the CPU is started, the BOOT Rom loader is used for driving basic IO devices such as a mouse, a keyboard and a display (the peripheral devices cannot be contained when the product is actually released, a single board is directly packaged in a box body which is small in size and convenient to install and detach), then the CPU jumps to a CF card to start an operating system based on Windows CE. And finally, running the application program of the Bluetooth multimedia tourism information system.
NET, the development of the application program of the Bluetooth multimedia tourism information system is based on Windows CE, and the application program is stored in a CF card or DOC equipment of a single board. The interface of the bluetooth module in fig. 3 is a USB bus, and since the operating system drives the USB bus after being started, the application program can directly send and receive an instruction to the bluetooth module through the USB interface to complete the communication between the access point and the bluetooth terminal user (the communication process includes the following key points: connection request < up >, connection establishment confirmation < down >, file list request < up >, file list delivery < down >, streaming file play request < up >, streaming file play confirmation < down >, streaming file entity delivery < down >, connection disconnection request < up >, and connection disconnection confirmation < down "). The network card is successfully driven after the BOOT Rom starts, the application program of the bluetooth multimedia tourist information system communicates with the system server through the network card, and the main events are as follows: the heartbeat state of the single board is reported to < uplink >, the tourist information is reported to < uplink >, the setting and operation of the server to the single board < downlink >, the file list request < uplink > is sent to the server, the file list < downlink > is obtained from the server, the stream file playing request < uplink > and the receiving < downlink > are obtained, and the like.
The mobile communication terminal comprises: bluetooth mobile phones, and PDAs, laptops, tablets with Bluetooth function.
The mobile communication terminal comprises a language selection module, a service selection module and a playing module; the user obtains a played media file list through menu operation of a language selection module; the mobile communication terminal receives the file list returned by the access point, the user selects the file to be played through the menu operation of the service selection module, and the media file playing request message is sent to the access point through the menu operation of the playing module.
The server is coupled with a workbench (workbench); the server provides a message interaction interface for the workbench; receiving an operation command from the workbench, issuing the operation command to the access point for execution, and reporting the states of the access point and the database to the workbench for near-end maintenance; and finishing the updating of the database information and the upgrading and maintenance of the access point software.
The system comprises a plurality of access points, each access point can access a plurality of mobile communication terminals; wherein, each access point is respectively connected with the server through the network.
The mobile communication terminal realizes the switching between the two access points based on the routing table.
When the network is congested, starting an Access Point (AP) local file system to continuously send a streaming file to the mobile communication terminal; and when the network is recovered to be normal, the server continues to send the streaming file for the mobile communication terminal.
The access points comprise a main access point and a standby access point; when the main access point has permanent fault, the server arbitrates the standby access point of the access point, and the standby access point provides service for the mobile communication terminal continuously.
The stream file includes: audio files, video files, text files.
The system of the invention can be used in a plurality of fields such as hospitals, markets, tourist places and the like, thereby generating a plurality of multimedia information publishing systems. The multimedia travel information distribution system will now be described. As shown in fig. 1, the overall framework diagram of the multimedia travel information distribution system of the present invention mainly comprises the following modules: the system comprises a database (Data Base), a Server (Server), a workbench (Workstation), an Access Point (Access Point) and Terminal equipment (Terminal Device), and specifically completes the following functions:
database functions: the system is responsible for storing all tourism audio and video files; the system is responsible for storing all data files such as network state monitoring, tourist statistical information and the like; and is responsible for storing all network configuration information.
The server function: the system is responsible for loading and unloading the database files; and the system is responsible for issuing a list of streaming files (audio and video) and streaming files (audio and video) for all access points. The arbitration and operation (backup switching, roaming switching, reset restarting, etc.) of all the access point working states are responsible; drawing a visitor visiting path and counting hot spot messages (exhibits or products); and providing a message interaction interface for the operation table. Receiving an operation command from an operation desk (Workstation), issuing the operation command to an access point for execution, and reporting the states of the access point and a database to the operation desk for near-end maintenance; and finishing the implementation and updating of the database information and the upgrading and maintenance of the access point software.
The function of the operating platform is as follows: a near-end human-machine maintenance interface of a venue manager is provided, so that the state monitoring and operation of the manager on the local network are realized; and a TCP/IP remote maintenance interface is provided, and a program developer can view/maintain the network permission condition through a remote webpage.
An access point is a device that enables access of user terminal devices to the information system, abbreviated as AP. The equipment adopts software and hardware independently developed by Hangzhou kingdom science and technology Limited, the model of the hardware is BlueStation BM6502, and the software operating system is Windows CE.
The access point function: completing self-checking of the access point equipment and reporting the working state of the equipment to a server; and completing the access of the terminal equipment. Each access point can be simultaneously accessed into 7 terminal devices at most for data interaction, and meanwhile, 256 devices can be supported to be in a park Mode state at most; realizing the request of a file list and a stream file to a server; and finishing the message interaction between the access point and the terminal equipment.
Fig. 2 is a protocol stack between a bluetooth access point and a terminal device. The protocol stack forms the core of a bluetooth implementation. The protocol stack allows devices to access each other and establish a connection. Through this connection, devices can exchange data with each other through various applications. In the system, the connection is established between the access point and the terminal equipment through a Winsock profile of a Bluetooth protocol stack. Each access point can simultaneously access 7 terminal devices at most and perform data interaction with the 7 terminal devices, and simultaneously supports 256 devices in a park Mode state at most.
The terminal device refers to a device which is held by the passenger and has a bluetooth communication function, and the device can move along with the passenger, so the device is also called a Mobile Station (MS). The system can realize the access of various terminal devices, such as a Bluetooth mobile phone, a palm computer, a tablet computer, a notebook computer and the like.
The terminal equipment functions are as follows: providing a terminal user operation interface; and realizing the specific multimedia service requested by the terminal user.
Compared with the prior frequency modulation tour guide system, the tour information system adopting the Bluetooth wireless technology has the advantages that the network security, the stability, the flexibility, the expandability, the personalized service and the like are greatly improved. In the travel information system, four key technologies of application of Bluetooth wireless communication rate in the travel system, Roaming based on a Routing Table, uninterrupted transmission of stream files (continuous stream Transfer) and access point master backup switching (BuleSWAP) are adopted, so that the performance of the travel information system network is greatly improved.
The access point side operates: after the access point starts the application, the system automatically allocates a free Winsock channel (Port ID, see fig. 2 for details) and waits for access from the bluetooth device on this channel. Once the terminal equipment is successfully accessed, the system opens up an independent thread for the terminal equipment to receive the Bluetooth command and play the media file. After successfully accessing the terminal device, the system reallocates the free channel and waits for the access of the next bluetooth device until the maximum number of users is accessed.
Terminal equipment side operation: after the Bluetooth terminal equipment is successfully accessed, the user can acquire a playable media file list through the menu operation of language selection. After receiving the file list returned by the access point, the user selects the file to be played through menu operation, and then sends a media file playing request message to the access point. After the file playing is finished, the user can repeatedly operate the above instructions until the application program is exited.
Routing over Routing Table based Roaming technology (Routing Table):
the terminal equipment realizes roaming between two access points, so that the limitation of Bluetooth short-distance communication is solved, and the network service quality is greatly improved. Bluetooth communication is a short-range communication, and when a device moves to the edge of network coverage, the throughput of the system will be reduced to ensure uninterrupted transmission. When the device moves out of the effective network coverage of the bluetooth access point, the bluetooth link will be broken, thereby suspending the traffic being transmitted. In this case, the terminal device can be given access to a nearby access point, thereby maintaining uninterrupted service. For this purpose, a routing table roaming-based implementation technology is proposed. Fig. 4 is a diagram illustrating a roaming procedure between bluetooth aps.
The routing table is an execution path for guiding the system in the roaming switching process, and the system can automatically find the next standby access point according to the entry of the routing table and try to access the access point until the access is successful or the access fails after traversing all the routing tables, and then prompts to manually search the network.
When networking the tourist information system, the access points are arranged according to the actual layout of the venue, and a table is established at the server end of the system to describe the proximity relation among the access points, and the proximity relation determines the next default access point of the terminal equipment. An example of a routing table is as follows:
[ routing entry AP1]
AP1 neighbor AP 2;
AP1 neighbor AP 3;
[ routing entry AP2]
AP2 neighbor AP 3;
AP2 neighbor AP 1;
[ routing entry AP3]
AP3 neighbor AP 1;
AP3 neighbor AP 2;
the routing entry AP1 indicates the number of the access point of the service of a certain current terminal device, and the standby access points below the AP1 are AP2 and AP 3; by analogy, the standby access points of the AP2 are AP3 and AP1, and the standby access points of the AP3 are AP1 and AP 2.
Conditions for successful roaming to occur:
a) the signal-to-noise ratio (SNR) of the channel between the mobile station and the original AP is lower than a threshold value;
b) the mobile station is under the simultaneous coverage of two networks;
c) the target network has redundant idle channels.
If an end device is under the service of AP1, when AP1 fails permanently, the system will enter the routing table and attempt to access the alternate access point. The system will enumerate the standby access points to AP1 as AP2 and AP3 in that order, and access AP2 and AP3 in that order. For example, if the Mobile Station (MS) is originally under the coverage of the AP1 network, the routing entry is AP 1. When the MS moves to the boundary between AP1 and AP3 (but not to the boundary between AP1 and AP2), it is shown as MS1 in FIG. 4. The mobile station will prefer to access AP2 based on the routing table and select access AP3 if access AP2 fails.
Pseudo code for roaming services is as follows:
GetRoutingTable()；
if(SNR＜THRESHOLD)
{
acquiring target access points from a routing table inlet, wherein the target access points are AP2 and AP3 in sequence;
backing up the current service site; // record all flags associated with AP1
Disconnect (AP 1); // disconnected from AP1
int navailablelap ═ GetAvailableApNum (AP 1); // when the entry is AP1, nAvailableAp
＝2
int I＝0；
for(I＝0；I＜nAvailable；I++)
{
AP [ I ] ═ getap (I); when the entrance is AP1, AP 0 equals AP2, AP1 equals AP3
}
for(I＝0；I＜nAvailable；I++)
{
int nRetryTime＝0；
while (nRetryTime < 3)// Access to AP [ I ] three times with maximum attempts
{
if (Connect (AP [ I ]))// successful attempt to access AP [ I ]
{
Recovering the service site;
the AP2 continues to provide service for the mobile station;
return TURE；
}
else
nRetryTime++；
}
}
delete all the sites associated with MS 1; // roaming failure, requiring manual searching of the network
Prompting a user to manually search for a network;
retutn FALSE；
}
streaming file uninterrupted Transfer technology (Continuous Stream Transfer):
the precondition that the uninterrupted transmission of the stream file occurs is as follows:
a) the TCP/IP network is congested in a short time, and the stream file can not be transmitted to the mobile station terminal from the server temporarily;
b) the Bluetooth equipment of the AP has good running condition of the application program.
The technique of uninterrupted transmission of streaming files can ensure that the AP local file system is started to continue to send streaming files to the mobile station under the condition that the TCP/IP network is congested for a short time. And when the network is recovered to be normal (the task is completed by the heartbeat detection thread), the server continues to send the streaming file for the mobile station terminal. If the TCP/IP network cannot repair the failure within a certain time range, the server defines a new failure level (permanent failure) for the AP and starts the access point master-backup switching technology (BlueSWAP) described below to share the traffic of the access point.
Pseudo codes of the AP end stream file uninterrupted transmission technology are as follows:
if (abnormal heart beat detection thread between mobile station and server)
{
Recording a stream file transmission progress indication;
int nLocalProgress＝nRemoteProgress；
if { Start AP local File System }
{
The local stream file is sent to the mobile station terminal from the current progress and the progress indication nLocalProgress is updated to nLocalProgress + nStep;
if (Heartbeat detection thread between mobile station and server is normal)
{
nRemoteProgress＝nLocalProgress；
Uploading the nRemoteprogress to a server;
the server continues to transmit the stream file to the mobile station from the current position;
}
}
else
{
printing a message to prompt the user;
releasing resources;
return FALSE；
}
}
pseudo codes of the server side stream file uninterrupted transmission technology are as follows:
if (abnormal heart beat detection thread between mobile station and server)
{
Recording a stream file transmission progress indication;
recording the system time when the fault occurs;
if { monitor AP's heartbeat again within a certain time }
{
Receiving a file progress indication uploaded by the AP;
nRemoteProgress＝nLocalProgress；
issuing the file of the stream before service to the mobile station terminal from the current progress and updating the progress indication nremotepprogress
＝nRemoteProgress+nStep；
}
else
{
Printing a log message;
defining error grade and starting a main backup switching mechanism;
}
}
access point master backup switching technology (BlueSWAP):
the access point main backup switching is another technique proposed for improving the reliability of the network stability, and the network performance can be greatly improved through the realization of the technique.
The main backup switching generating condition:
a) the server detects that the AP has permanent failure
b) Target access point has a free channel
Any one access point has two roles simultaneously: primary/backup status. When the primary access point has a permanent failure, the server arbitrates the standby access point of the access point (generally, the nearest access point takes the role of the backup machine), and then the standby access point continues to provide service for the mobile station. A1 + N backup mechanism is designed in the system, namely, a main machine has N backup machines, and the value of N depends on the setting of a routing table. As shown in the above table, AP1 has two standby machines AP2 and AP3, where N is 2. As illustrated with reference to fig. 3, when MS1 and MS2 are within the effective network coverage of AP1 and the SNR is greater than the threshold, AP1 provides data services to MS1 and MS2 in the role of the primary access point. When the AP1 is normal and the mobile-to-AP channel SNR is less than a threshold value, the mobile station will roam. When the AP1 has a permanent fault, the connection between the MS2 and the AP1 is disconnected, and the AP2 plays the role of an AP1 standby machine to provide uninterrupted service for the MS 2; the AP3 then serves the MS 1.
The invention has the following effects:
the application of the Bluetooth wireless communication technology in the tourism field is not precedent in China, and the application of the Bluetooth wireless communication technology in the tourism field is bound to lead a revolution of the tourism industry. The roaming technology based on the routing table can ensure that the next Bluetooth access point is successfully accessed in the shortest time, thereby ensuring the uninterrupted service. Compared with the general equipment search and service search, the access speed can be improved by 90s/2 s-45 times, and the current service is not terminated. When the access points are arranged in an actual indoor venue, the optimal layout is given according to the actual situation so as to ensure the highest roaming success rate. The adoption of the streaming file uninterrupted transmission technology can relieve the short-time congestion condition brought to the network by multiple users and provide high-quality video and audio services for the clients. The actual measurement and calculation result shows that the service interruption rate is reduced to below 0.1 percent of the original rate. By implementing the master-backup switching technology of the access point, the Mean Time Between Failures (MTBF) of the network can be 50000 hours, and the mean Time to repair Time (MTTR) of the network can be 15 minutes.
Besides the advantages and effects brought by the keys, compared with the prior travel information system in a frequency modulation mode, the system has the following advantages and characteristics: multiple users can access asynchronously; a good human-computer interface; providing a selection of a multi-national language; high quality audio and video transmission; the information, the explanation and the video data of the system can be updated in real time, and the remote maintenance of the database can be realized;
the central server can automatically draw a personnel distribution map and record personnel action routes, has a monitoring function, provides a user track route recording and personnel distribution statistical function, and provides data support for later network optimization and monitoring;
the whole set of network can be seamlessly upgraded to a wireless local area network (broadband network), and the upgrading cost is low because only the access points of the wireless network are increased; the network security is high; the network stability is high, and the service master/backup conversion can be realized among the access points;
the user can automatically switch service among a plurality of access points to realize the roaming function, thereby overcoming the limitation of short-distance communication of the Bluetooth technology; and various user terminal devices are supported, including a Bluetooth mobile phone, a palm computer, a tablet computer, a notebook computer and the like.
The multimedia tourism information publishing system can be applied to indoor and outdoor venue facilities, such as museums, theme scenic spots and the like. At present, the national culture office advocates the construction of digital museums, the system application can promote the digital construction of the museums and cater to the requirements of passenger individuation and interactive service.
The access points can be reasonably arranged according to the actual venue structure of the museum so as to achieve the highest roaming success rate and network service quality. In this system, an access point can serve one exhibition hall or a plurality of exhibition halls, and then information is gathered to a server and stored in a database. The following example assumes that an access point serves an exhibition hall (the specific layout depends on the museum building).
A server;
exhibition hall 1 (tang dynasty exhibition hall corresponds to AP 1); exhibit selection (three-color tomb warriors, gold-inlaid bullhead agate cups, imperial drawing);
exhibition hall 2 (songxiang exhibition hall corresponds to AP 2); selecting exhibits (green glaze picking flower and upside down placing pot, Qianlijiangshan picture, gold drawing and paint stacking Sheli letter);
exhibition hall 3 (Yuanxiang exhibition hall corresponds to AP 3); exhibition selection (teal, dragon vein loose-ring goblet, green flower pine and plum line furnace);
exhibition hall n (the Qing dynasty exhibition hall corresponds to APn); and (4) selecting the exhibit (Chinese character 'Shuihu' picture, jade Chinese character washing, Hongdian big reading armor).
Information displayed by the terminal equipment:
welcome to the word by the terminal equipment: automatic tour guide system for welcoming you to use museum
And (4) menu operation: start/language selection/exhibition hall selection/exhibit selection/play
Thereby realizing the playing of the museum information.
The above specific embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
Claims (10)
1. A multimedia information distribution system, characterized by comprising: the system comprises a mobile communication terminal, a plurality of access points, a server and a database;
the mobile communication terminal is coupled with the server through the access point, and the server is coupled with the database;
wherein,
the mobile communication terminal at least comprises: the mobile communication terminal is used for realizing the multimedia service requested by the terminal user;
the database is as follows: for storing streaming file multimedia information including audio, video and text formats;
each access point of the plurality of access points includes at least: each access point is used for reporting the working state of the access point to the server, completing the access of the mobile communication terminal, realizing the request of a stream file list and a stream file to the server and completing the message interaction with the mobile communication terminal;
the plurality of access points form a Bluetooth short-distance communication network, and the mobile communication terminal can be switched between the two access points;
the server: the system is used for loading and unloading the database file; issuing the stream file and the stream file list of the access point; arbitrating and operating the working state of the access point; processing multimedia information; and, the server has a routing table for describing the proximity relationship among the plurality of access points and determining the next access point of the mobile communication terminal according to the proximity relationship among the access points.
2. The system of claim 1, wherein each of the plurality of access points comprises: CPU, program guide module, blue tooth module, power supply module and interface.
3. The system of claim 2, wherein said CPU controls said program guide module to start an application program, allocate a free channel, and wait for mobile communication terminal access on this channel;
after the mobile communication terminal is accessed, an independent thread is opened up for the mobile communication terminal to receive the Bluetooth command and play the stream file.
4. The system of claim 1, wherein the mobile communication terminal is a bluetooth mobile phone, or a bluetooth PDA, or a notebook computer, or a tablet computer;
the mobile communication terminal comprises a language selection module, a service selection module and a playing module; wherein,
a user obtains a played stream file list through menu operation of a language selection module; the mobile communication terminal receives the stream file list returned by the access point, the user selects the file to be played through the menu operation of the service selection module, and sends the stream file playing request message to the access point through the menu operation of the playing module.
5. The system of claim 1, wherein the server is coupled to a workstation; the server provides a message interaction interface for the workbench; the server receives the operation command from the workbench, issues the operation command to the access point for execution, and reports the states of the access point and the database to the workbench for near-end maintenance; the server finishes the updating of database information and the upgrading maintenance of access point software;
the said working platform also provides TCP/IP remote program interface for checking or maintaining network operation condition through remote web page.
6. The system according to any one of claims 1 to 5, wherein each of said access points is capable of accessing a plurality of said mobile communication terminals; wherein, each access point is respectively connected with the server through a TCP/IP network.
7. The system according to claim 6, wherein said mobile communication terminal performs a routing table based handover between two access points.
8. The system according to claim 6, wherein when the TCP/IP network is congested, the access point local file system is started to continue to send streaming files for the mobile communication terminal; and when the TCP/IP network is recovered to be normal, the server continues to issue the streaming file for the mobile communication terminal.
9. The system of claim 8, wherein the access point is operable as both a primary access point and a backup access point;
when the main access point has permanent fault, the server arbitrates the standby access point of the main access point, and the standby access point continues to provide service for the mobile communication terminal.
10. A multimedia travel information distribution system is characterized by comprising: the system comprises a mobile communication terminal, a plurality of access points, a server and a database;
the mobile communication terminal is coupled with the server through the access point, and the server is coupled with the database;
wherein,
the mobile communication terminal at least comprises: the mobile communication terminal is used for realizing the multimedia service requested by the terminal user;
the database is as follows: the system is used for storing the multimedia information of the stream file comprising a travel audio file, a travel video file and a text format;
each access point of the plurality of access points includes at least: each access point is used for reporting the working state of the access point to the server, completing the access of the mobile communication terminal, realizing the request of a stream file list and a stream file to the server and completing the message interaction with the mobile communication terminal;
the plurality of access points form a Bluetooth short-distance communication network, and the mobile communication terminal can be switched between the two access points;
the server: the system is used for loading and unloading the database file; issuing the stream file and the stream file list of the access point; arbitrating and operating the working state of the access point; processing multimedia information; and, the server has a routing table for describing the proximity relationship among the plurality of access points and determining the next access point of the mobile communication terminal according to the proximity relationship among the access points.
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Cited By (1)
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| CN102946378A (en) * | 2012-10-16 | 2013-02-27 | 江苏南大腾龙信息科技有限公司 | Mobile location and multimedia information pushing network system based on Bluetooth |
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| CN102547630B (en) * | 2010-12-13 | 2015-03-11 | 中国移动通信集团辽宁有限公司 | Mobile terminal service multimedia displaying method, terminal and system |
| CN102655689B (en) * | 2011-11-23 | 2014-12-31 | 上海华博信息服务有限公司 | Mobile equipment and exhibited item interaction information processing method based on wireless fidelity (WiFi), and device therefor |
| CN103839168A (en) * | 2012-11-21 | 2014-06-04 | 大连灵动科技发展有限公司 | Cross-terminal tourism information publishing method |
| US9491691B2 (en) * | 2014-09-11 | 2016-11-08 | Laird Technologies, Inc. | Bluetooth assisted cooperative WiFi scan and roam |
| CN105139297A (en) * | 2015-06-29 | 2015-12-09 | 江苏鸿信系统集成有限公司 | Public service method of international sports events |
| CN105792385B (en) * | 2016-02-29 | 2020-01-10 | 宇龙计算机通信科技(深圳)有限公司 | Communication method and device based on wireless local area network |
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