CN110266993B - Wireless ad hoc network video communication method and terminal thereof - Google Patents

Wireless ad hoc network video communication method and terminal thereof Download PDF

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Publication number
CN110266993B
CN110266993B CN201910554849.6A CN201910554849A CN110266993B CN 110266993 B CN110266993 B CN 110266993B CN 201910554849 A CN201910554849 A CN 201910554849A CN 110266993 B CN110266993 B CN 110266993B
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terminal
video communication
communication
calling
called
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CN110266993A (en
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林峰
王徐芳
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Fuzhou Institute Of Data Technology Co ltd
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Fuzhou Institute Of Data Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64723—Monitoring of network processes or resources, e.g. monitoring of network load
    • H04N21/64738—Monitoring network characteristics, e.g. bandwidth, congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Abstract

The invention discloses a wireless ad hoc network video communication method and a terminal thereof, which utilize a high-bandwidth wireless ad hoc network and a mobile terminal thereof to carry out mobile video communication. In the wireless ad hoc network, a terminal A searches for the optimal path of a terminal B according to an ad hoc network routing protocol, judges that the network bandwidth from the terminal A to the terminal B meets the video communication requirement, and establishes a video communication connection link through each intermediate forwarding terminal of the wireless ad hoc network. The invention can develop video communication service without deploying communication facilities with longer construction period, such as a mobile base station, a return network, a core network and the like in advance, and is suitable for emergency communication, mountain communication, water/sea communication and video communication in areas where various mobile communication networks are difficult to deploy.

Description

Wireless ad hoc network video communication method and terminal thereof
Technical Field
The invention relates to the field of ad hoc networks, in particular to a wireless ad hoc network video communication method and a terminal thereof.
Background
The highly flexible wireless ad hoc network not only supports point-to-point, point-to-multipoint, but also supports multipoint-to-multipoint, thus becoming an ideal wireless communication means in applications such as mobile video monitoring, commanding and controlling or mobile robots. The wireless ad hoc network generally has the characteristics of limited transmission bandwidth, high error rate, frequent link change and the like, and the multimedia data transmission, particularly the video stream transmission, has higher requirements on the bandwidth and is sensitive to delay, packet loss and error codes, so the problem of video communication of the wireless ad hoc network is researched, the limited resources of the wireless ad hoc network are fully utilized according to the communication characteristics of the wireless ad hoc network, and a practical and effective video communication scheme needs to be designed. Video communication of wireless ad hoc networks has remained an open research hotspot problem so far. Video communication has a large bandwidth demand, however, the network topology of the wireless ad hoc network may change in real time as the user moves, resulting in a change, even a drastic change, in the network transmission bandwidth. The existing wireless ad hoc network video communication technology cannot judge whether the nodes have a high bandwidth condition in real time, so that the video communication service cannot be effectively and stably provided.
Disclosure of Invention
The invention aims to provide a wireless ad hoc network video communication method and a terminal thereof.
The technical scheme adopted by the invention is as follows:
a wireless ad hoc network video communication method comprises the following steps:
step 1, respectively configuring editable logic identification numbers for each communication terminal, wherein the logic identification numbers have uniqueness and are used as calling numbers and called numbers of video communication;
step 2, setting the minimum speed R required by video communication, and the connectable measurement period of the terminal is TcValue of (1), terminal communicable measurement detection period TvA value of (a), and Tv＞Tc；
Step 3, every T of each communication terminalcPeriodically searching and maintaining local connection terminal list LcLocal connection terminal list LcRecording terminal information which can be connected with a local network in the ad hoc network;
step 4, every T of each communication terminalvPeriodic local connection terminal list LcList L of terminals communicating with the local terminalvComparing and updating the local communication terminal list Lv；
Step 5, any communication terminal uses the identity of the calling terminal to select the local communication terminal list LvSelects a communication terminal as a called terminal to initiate a video communication call,
step 6, the called terminal receives the video communication call request and refers to the communication terminal list L of the called terminalvThe corresponding response processing is carried out, and the response processing is carried out,
step 7, after the video communication connection is established, the two communication parties detect the local connection terminal list L in real timecList L of terminals communicating with the local terminalvAnd executes a corresponding video communication call termination policy.
Further, the logic identification number in step 1 is an arabic number with a fixed number of digits.
Further, the logical identification number is an arabic number of a fixed number of digits (e.g., 3-digit).
Further, as a preferred embodiment, the lowest rate R in step 2 is 2 mbit/sec, and the terminal can be connected with the measurement period Tc1 second, the terminal can measure the detection period TvIt was 3 seconds.
Further, the local communication terminal list L is updated in step 4vThe method comprises the following steps:
when the terminal i is in the communication terminal list LvBut not in the connection terminal list LcIf so, the terminal i is selected from the communication terminal list LvClearing;
list L of communication terminals when terminals i are simultaneously presentvAnd a connection terminal list LcWhen the two lists are in the same list, the connection rate r of the terminal i and the local device is measuredi(ii) a When r isiIf R is less than R, the terminal i is listed in the communication terminal list LvClearing;
when the terminal i is in the connection terminal list LcBut not in the communication terminal list LvIn the middle time, the connection rate r of the terminal i and the local machine is measuredi(ii) a When r isiIf not less than R, adding terminal i into communication terminal list LvIn (1).
Further, the local communication terminal list L of the calling terminal in step 5vThe communication directory dynamically displays the logic identification numbers of all communication terminals capable of carrying out video communication with the local machine, and the calling terminal selects one communication terminal from the communication directory and initiates a call request of the video communication; the calling request takes the logic identification number of a calling terminal as a calling number and takes the logic identification number of a called terminal as a called number; the calling request takes a physical address corresponding to a calling number as a source address and a physical address corresponding to a called number as a destination address, and utilizes an ad hoc network routing protocol to transmit the calling request to a called terminal from the calling terminal to the called terminal through each intermediate node of an ad hoc network path in sequence.
Further, in step 6, the called terminal receives the call request, analyzes the calling number from the call request, identifies the calling terminal and performs response processing:
when the called terminal is in video communication, a prompt that the called terminal is busy is replied to the calling terminal, and the calling request is rejected;
local communication terminal list L when calling terminal is not in called terminalvIf yes, a prompt that the called party cannot be connected is replied to the calling terminal, and the calling request is rejected;
local communication terminal list L when calling terminal is at called terminalvAnd if the called terminal is idle, the called terminal rings, and then the called terminal performs answering processing.
Further, the specific method for the called terminal to perform answering processing is as follows:
when the called terminal carries out answering processing and refuses answering, a prompt that the called refuses answering is replied to the calling terminal, and the calling request is refused;
when the called terminal does not answer after the answering processing exceeds the specified time (such as 1 minute), the prompt of answering overtime of the called terminal is replied, and the call request is rejected;
and when the called terminal answers within the specified time, receiving the call request, and establishing a video communication connection link from the calling terminal to the called terminal in the ad hoc network.
Further, the video communication call termination policy in step 7 is specifically as follows:
when a calling terminal or a called terminal actively initiates a call request for terminating video communication, terminating the video communication;
when the calling terminal is not in the local connection terminal list of the called terminal, terminating the video communication;
when the called terminal is not in the local connection terminal list of the calling terminal, terminating the video communication;
when the calling terminal is in the local connection terminal list of the called terminal but not in the local communication terminal list of the called terminal, the called terminal only plays the voice signal of the calling terminal and prompts that the connection rate is low; when the calling terminal reenters the local communication terminal list of the called terminal within the specified time, the video communication is continued, otherwise, the video communication is terminated;
when the called terminal is in the local connection terminal list of the calling terminal but not in the local communication terminal list of the calling terminal, the calling terminal only plays the voice signal of the called terminal and prompts that the connection rate is low; and when the called terminal reenters the local communication terminal list of the calling terminal within the specified time, the video communication is continued, otherwise, the video communication is terminated.
The invention also discloses a wireless ad hoc network video communication terminal, which applies the wireless ad hoc network video communication method, the video communication terminal comprises a video communication module, a wireless ad hoc network communication module and a battery power supply module,
the video communication module comprises a touch screen, a camera, a microphone, a loudspeaker and a main control module, wherein the touch screen is responsible for displaying received image video signals and providing a key input function, the camera is responsible for acquiring and generating the image video signals, the microphone is responsible for converting sound signals into electric signals, and the loudspeaker is responsible for converting the electric signals into sound signals; the main control module is responsible for controlling and driving the functions of the touch screen, the camera, the microphone and the loudspeaker and providing video communication service for users;
the wireless ad hoc network communication module comprises a radio frequency module, a baseband module and a routing module;
the radio frequency module is responsible for amplifying high-frequency signals received by the antenna and transmitting signals generated by the baseband module out through the antenna;
the baseband module is responsible for signal modulation and demodulation, demodulates the analog signal provided by the radio frequency module into a data message and sends the data message to the routing module for processing; modulating the data message generated by the routing module into an analog signal and sending the analog signal to the radio frequency module;
the routing module is responsible for analyzing the received data message and terminating the network transmission of the data message according to an ad hoc network routing protocol or selecting a next hop node of the network to continue transmitting the data message; or generating a data message and sending the data message to the next hop node of the network according to the ad hoc network routing protocol;
the battery power supply module can continuously supply power for a long time when the terminal is in a mobile and portable state.
Furthermore, the video communication terminal has three different working modes in the wireless ad hoc network, namely a video communication state, an intermediate forwarding state and a standby state; video communication state: a calling terminal and a called terminal which carry out video communication are in a video communication state; intermediate forwarding state: forwarding communication data of a calling terminal and a called terminal only according to an ad hoc network routing protocol, wherein the video communication terminal in an intermediate forwarding state does not display video communication information and serves as an intermediate node of the ad hoc network; standby state: other nodes that do not participate in video communication data forwarding exist as ad hoc networks.
Further, multiple video communication connections may exist simultaneously in a wireless ad hoc network. One video communication terminal can be simultaneously positioned in a plurality of video communication connections of the wireless ad hoc network and respectively positioned in different working modes, one video communication terminal can be simultaneously positioned in an intermediate forwarding state or a standby state in different video communication connections at the same time, but one video communication terminal cannot be simultaneously positioned in a video communication state in the plurality of video communication connections.
By adopting the technical scheme, the invention provides the wireless ad hoc network video communication system which has high bandwidth and can be quickly established by fully utilizing the advantages of the wireless ad hoc network such as mobility, self-adaptive flexible networking, multi-hop relay, survivability and self-healing and the like. The system can develop video communication services without deploying communication facilities with long construction periods, such as a mobile base station, a return network, a core network and the like in advance, and is suitable for emergency communication, mountain communication, water/sea communication and video communication in areas where various mobile communication networks are difficult to deploy.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
fig. 1 is a schematic diagram of the process of generating and updating the local communication terminal list according to the present invention.
Fig. 2 is a schematic diagram of a network structure of the wireless ad hoc network video communication of the present invention;
FIG. 3 is a schematic diagram of a wireless ad hoc network video communication connection according to the present invention;
fig. 4 is a schematic structural diagram of a video communication terminal according to the present invention;
fig. 5 is a schematic structural diagram of a wireless ad hoc network communication module according to the present invention.
Fig. 6 is a schematic structural diagram of a video communication module of the video communication terminal according to the present invention;
Detailed Description
As shown in one of fig. 1 to 6, the present invention discloses a wireless ad hoc network video communication method, which comprises the following steps:
step 1, respectively configuring editable logic identification numbers for each communication terminal, wherein the logic identification numbers have uniqueness and are used as calling numbers and called numbers of video communication; further, the logic identification number in step 1 is an arabic number with a fixed number of digits. E.g., 001, 020, 980, the logical identification number is editable and serves as both the calling number and the called number for the video communication. In a wireless ad hoc network, the logic identification number of each terminal has uniqueness and cannot be the same as other terminals.
Step 2, as shown in fig. 1, setting the minimum speed R required for video communication, and the connectable measurement period of the terminal is TcValue of (1), terminal communicable measurement detection period TvA value of (a), and Tv＞Tc(ii) a Further, as a preferred embodiment, the lowest rate R in step 2 is 2 mbit/sec, and the terminal can be connected with the measurement period Tc1 second, the terminal can measure the detection period TvIt was 3 seconds.
Step 3, every T of each communication terminalcPeriodically searching and maintaining local connection terminal list LcLocal connection terminal list LcRecording terminal information which can be connected with a local network in the ad hoc network and comprises a physical address of the terminal and a corresponding logic identification number;
step 4, every T of each communication terminalvPeriodic local connection terminal list LcList L of terminals communicating with the local terminalvMake a comparison and update the bookMachine communication terminal list Lv. Local communication terminal list LvThe list will record each terminal information that can be in video communication with the local machine, including the physical address of the terminal and the corresponding logical identification number.
Further, the local communication terminal list L is updated in step 4vThe method comprises the following steps:
when the terminal i is in the communication terminal list LvBut not in the connection terminal list LcIf so, the terminal i is selected from the communication terminal list LvClearing;
list L of communication terminals when terminals i are simultaneously presentvAnd a connection terminal list LcWhen the two lists are in the same list, the connection rate r of the terminal i and the local device is measuredi(ii) a When r isiIf R is less than R, the terminal i is listed in the communication terminal list LvClearing;
when the terminal i is in the connection terminal list LcBut not in the communication terminal list LvIn the middle time, the connection rate r of the terminal i and the local machine is measuredi(ii) a When r isiIf not less than R, adding terminal i into communication terminal list LvIn (1).
Step 5, any communication terminal uses the identity of the calling terminal to select its own communication terminal list LvSelects a communication terminal as the called terminal b to initiate a video communication call,
further, the local communication terminal list L of the calling terminal a in step 5vThe communication directory dynamically displays the logic identification numbers of all communication terminals capable of carrying out video communication with the local machine, the calling terminal a selects one communication terminal from the communication directory as a called terminal b, and initiates a call request of the video communication; the calling request takes the logic identification number of a calling terminal a as a calling number and takes the logic identification number of a called terminal b as a called number; the calling request takes a physical address corresponding to a calling number as a source address and a physical address corresponding to a called number as a destination address, and utilizes an ad hoc network routing protocol to transmit the calling request from a calling terminal a to a called terminal b sequentially through each intermediate node of an ad hoc network path.
Step 6, the called partyThe terminal b receives the video communication call request and refers to the communication terminal list L of the called terminal bvAnd carrying out corresponding response processing. Further, in step 6, the called terminal b receives the call request, analyzes the calling number from the call request, identifies the calling terminal a and performs response processing:
when the called terminal a is in video communication, a prompt that the called terminal is busy is replied to the calling terminal a, and the calling request is rejected;
local communication terminal list L when calling terminal a is not in called terminal bvIf yes, a prompt that the called party cannot be connected is replied to the calling terminal a, and the calling request is rejected;
local communication terminal list L when calling terminal a is at called terminal bvAnd if the called terminal b is idle, the called terminal b rings, and then the called terminal b performs answering processing.
Further, the specific method for the called terminal b to perform answering processing is as follows:
when the called terminal b carries out answering processing and refuses answering, a prompt that the called refuses answering is replied to the calling terminal a, and the calling request is refused;
when the called terminal b does not answer after the answering processing exceeds the specified time (such as 1 minute), the prompt of called answering overtime is replied, and the call request is rejected;
and when the called terminal b receives the call within the specified time, receiving the call request, and establishing a video communication connection link from the calling terminal a to the called terminal b for receiving in the ad hoc network.
Step 7, after the video communication connection is established, the two communication parties detect the local connection terminal list L in real timecList L of terminals communicating with the local terminalvAnd executes a corresponding video communication call termination policy. Further, the video communication call termination policy in step 7 is specifically as follows:
when a calling terminal a or a called terminal b actively initiates a call request for terminating video communication, terminating the video communication;
when the calling terminal a is not in the local connection terminal list of the called terminal b, terminating the video communication;
when the called terminal b is not in the local connection terminal list of the calling terminal a, terminating the video communication;
when the calling terminal a is in the local connection terminal list of the called terminal b but not in the local communication terminal list of the called terminal b, the called terminal b only plays the voice signal of the calling terminal a and prompts that the connection speed is low, and the user is advised to adjust the picture prompt of the answering position and not play the continuous video picture of the terminal a any more; when the calling terminal a reenters the local communication terminal list of the called terminal b within the specified time (such as within 1 minute), the video communication is continued, otherwise, the video communication is terminated;
when the called terminal b is in the local connection terminal list of the calling terminal a but not in the local communication terminal list of the calling terminal a, the calling terminal a only plays the voice signal of the called terminal b and prompts that the connection rate is low, and the user is advised to adjust the picture prompt of the answering position and not play the continuous video picture of the called terminal b any more; and when the called terminal b reenters the local communication terminal list of the calling terminal a within the specified time, the video communication is continued, otherwise, the video communication is terminated.
The invention also discloses a wireless ad hoc network video communication terminal and the wireless ad hoc network video communication method. As shown in fig. 2, in a video communication connection of a wireless ad hoc network, a communication terminal can be divided into the following three states according to different operation modes:
video communication state, the corresponding terminal: and the calling terminal and the called terminal carry out the video communication.
The intermediate forwarding state, the corresponding terminal: and forwarding communication data of the calling terminal and the called terminal only according to the ad hoc network routing protocol, wherein the ad hoc network intermediate nodes do not display video communication information.
State of stand-by, the corresponding terminal: and other ad hoc network nodes which do not participate in the forwarding of the video communication data.
Multiple video communication connections may exist simultaneously in a wireless ad hoc network. A terminal may be located in multiple video communication connections of a network and may thus be in multiple operating states simultaneously. One terminal may be in a video communication state of a certain connection, or may be simultaneously in an intermediate forwarding state or a standby state of other connections, but cannot be simultaneously in a video communication state in a plurality of connections. Similarly, a terminal may be in the intermediate forwarding state of a certain connection, or may be in the intermediate forwarding state or standby state of other connections, or in the video communication state of a certain connection; the connection can be in a standby state, or in an intermediate forwarding state or a standby state of other connections, or in a video communication state of a connection.
As shown in fig. 3, the terminal B is in the intermediate forwarding state in the video communication connection 1, in the video communication state in the video communication connection 2, and in the standby state in the video communication connection 3. The terminal A, C is in a video communication state in the video communication connection 1, and is in a standby state in the video communication connections 2, 3. The terminal D, G is in a standby state in the video communication connection 1, and is in an intermediate forwarding state in the video communication connections 2, 3.
The video communication terminal comprises a video communication module, a wireless ad hoc network communication module and a battery power supply module,
as shown in fig. 6, the video communication module includes a touch screen, a camera, a microphone, a speaker and a main control module, the touch screen is responsible for displaying received image video signals and providing a key input function, the camera is responsible for collecting and generating image video signals, the microphone is responsible for converting acoustic signals into electrical signals, and the speaker is responsible for converting electrical signals into acoustic signals; the main control module is responsible for controlling and driving the functions of the touch screen, the camera, the microphone and the loudspeaker and providing video communication service for users;
specifically, as shown in fig. 4, when the terminal is in a video communication state, the video communication module is responsible for receiving video communication data from the wireless ad hoc network communication module, displaying a video picture, and playing voice information; and simultaneously, sending the video pictures and the voice information received by the machine to a wireless ad hoc network communication module.
When the terminal is in a video communication state, the wireless ad hoc network communication module is responsible for receiving video communication data sent to the self-body from the wireless ad hoc network and forwarding the video communication data to the video communication module of the self-body; and simultaneously sending the video communication data received by the local video communication module to the wireless self-organizing network.
When the terminal is in the intermediate forwarding state, the wireless ad hoc network communication module is only responsible for receiving video communication data and forwarding the data to the next hop terminal of the wireless ad hoc network according to the ad hoc network routing protocol.
As shown in fig. 5, the wireless ad hoc network communication module includes a radio frequency module, a baseband module, and a routing module;
the radio frequency module is responsible for amplifying high-frequency signals received by the antenna and transmitting signals generated by the baseband module out through the antenna;
the baseband module is responsible for signal modulation and demodulation, demodulates the analog signal provided by the radio frequency module into a data message and sends the data message to the routing module for processing; modulating the data message generated by the routing module into an analog signal and sending the analog signal to the radio frequency module;
the routing module is responsible for analyzing the received data message and terminating the network transmission of the data message according to an ad hoc network routing protocol or selecting a next hop node of the network to continue transmitting the data message; or generating a data message and sending the data message to the next hop node of the network according to the ad hoc network routing protocol;
the battery power supply module can continuously supply power for a long time when the terminal is in a mobile and portable state.
By adopting the technical scheme, the invention provides the wireless ad hoc network video communication system which has high bandwidth and can be quickly established by fully utilizing the advantages of the wireless ad hoc network such as mobility, self-adaptive flexible networking, multi-hop relay, survivability and self-healing and the like. The system can develop video communication services without deploying communication facilities with long construction periods, such as a mobile base station, a return network, a core network and the like in advance, and is suitable for emergency communication, mountain communication, water/sea communication and video communication in areas where various mobile communication networks are difficult to deploy.

Claims (8)

1. A wireless ad hoc network video communication method is characterized in that: which comprises the following steps:
step 1, respectively configuring editable logic identification numbers for each communication terminal, wherein the logic identification numbers have uniqueness and are used as calling numbers and called numbers of video communication;
step 2, setting the minimum speed R required by video communication, and the connectable measurement period of the terminal is TcValue of (1), terminal communicable measurement detection period TvA value of (a), and Tv＞Tc；
Step 3, every T of each communication terminalcPeriodically searching and maintaining local connection terminal list LcLocal connection terminal list LcRecording terminal information which can be connected with a local network in the ad hoc network;
step 4, every T of each communication terminalvPeriodic local connection terminal list LcList L of terminals communicating with the local terminalvComparing and updating the local communication terminal list Lv(ii) a Updating local communication terminal list LvThe method comprises the following steps:
when the terminal i is in the communication terminal list LvBut not in the connection terminal list LcIf so, the terminal i is selected from the communication terminal list LvClearing;
list L of communication terminals when terminals i are simultaneously presentvAnd a connection terminal list LcWhen the two lists are in the same list, the connection rate r of the terminal i and the local device is measuredi(ii) a When r isiIf R is less than R, the terminal i is listed in the communication terminal list LvClearing;
when the terminal i is in the connection terminal list LcBut not in the communication terminal list LvIn the middle time, the connection rate r of the terminal i and the local machine is measuredi；
When r isiIf not less than R, adding terminal i into communication terminal list LvPerforming the following steps;
step 5, any communication terminal uses the identity of the calling terminal to select the local communication terminal list LvThe real-time information selects a communication terminal as a called terminal to initiateIn the case of a video communication call,
step 6, the called terminal receives the video communication call request and refers to the communication terminal list L of the called terminalvThe corresponding response processing is carried out, and the response processing is carried out,
step 7, after the video communication connection is established, the two communication parties detect the local connection terminal list L in real timecList L of terminals communicating with the local terminalvAnd executes a corresponding video communication call termination policy.
2. The wireless ad hoc network video communication method according to claim 1, wherein: in step 1, the logic identification number is an Arabic number with a fixed digit.
3. The wireless ad hoc network video communication method according to claim 1, wherein: local communication terminal list L of calling terminal in step 5vThe communication directory dynamically displays the logic identification numbers of all communication terminals capable of carrying out video communication with the local machine, and the calling terminal selects one communication terminal from the communication directory and initiates a call request of the video communication; the calling request takes the logic identification number of a calling terminal as a calling number and takes the logic identification number of a called terminal as a called number; the calling request takes a physical address corresponding to a calling number as a source address and a physical address corresponding to a called number as a destination address, and utilizes an ad hoc network routing protocol to transmit the calling request to a called terminal from the calling terminal to the called terminal through each intermediate node of an ad hoc network path in sequence.
4. The wireless ad hoc network video communication method according to claim 1, wherein: in step 6, the called terminal receives the call request, analyzes the calling number from the call request, identifies the calling terminal and carries out response processing:
when the called terminal is in video communication, a prompt that the called terminal is busy is replied to the calling terminal, and the calling request is rejected;
local communication terminal list L when calling terminal is not in called terminalvIf so, the calling terminal is calledReplying the prompt that the called party cannot be connected, and rejecting the call request;
local communication terminal list L when calling terminal is at called terminalvAnd if the called terminal is idle, the called terminal rings, and then the called terminal performs answering processing.
5. The wireless ad hoc network video communication method according to claim 4, wherein: the specific method for the called terminal to answer the call comprises the following steps:
when the called terminal carries out answering processing and refuses answering, a prompt that the called refuses answering is replied to the calling terminal, and the calling request is refused;
when the called terminal does not answer after the specified time, replying the prompt of called answering overtime and refusing the call request;
and when the called terminal answers within the specified time, receiving the call request, and establishing a video communication connection link from the calling terminal to the called terminal in the ad hoc network.
6. The wireless ad hoc network video communication method according to claim 1, wherein: the video communication call termination policy in step 7 is specifically as follows:
when a calling terminal or a called terminal actively initiates a call request for terminating video communication, terminating the video communication;
when the calling terminal is not in the local connection terminal list of the called terminal, terminating the video communication;
when the called terminal is not in the local connection terminal list of the calling terminal, terminating the video communication;
when the calling terminal is in the local connection terminal list of the called terminal but not in the local communication terminal list of the called terminal, the called terminal only plays the voice signal of the calling terminal and prompts that the connection rate is low; when the calling terminal reenters the local communication terminal list of the called terminal within the specified time, the video communication is continued, otherwise, the video communication is terminated;
when the called terminal is in the local connection terminal list of the calling terminal but not in the local communication terminal list of the calling terminal, the calling terminal only plays the voice signal of the called terminal and prompts that the connection rate is low; and when the called terminal reenters the local communication terminal list of the calling terminal within the specified time, the video communication is continued, otherwise, the video communication is terminated.
7. A wireless ad hoc network video communication terminal, which adopts a wireless ad hoc network video communication method according to any one of claims 1 to 6, characterized in that: the terminal comprises a video communication module, a wireless ad hoc network communication module and a battery power supply module,
the video communication module comprises a touch screen, a camera, a microphone, a loudspeaker and a main control module, wherein the touch screen is responsible for displaying received image video signals and providing a key input function, the camera is responsible for acquiring and generating the image video signals, the microphone is responsible for converting sound signals into electric signals, and the loudspeaker is responsible for converting the electric signals into sound signals; the main control module is responsible for controlling and driving the functions of the touch screen, the camera, the microphone and the loudspeaker and providing video communication service for users;
the wireless ad hoc network communication module comprises a radio frequency module, a baseband module and a routing module;
the radio frequency module is responsible for amplifying high-frequency signals received by the antenna and transmitting signals generated by the baseband module out through the antenna;
the baseband module is responsible for signal modulation and demodulation, demodulates the analog signal provided by the radio frequency module into a data message and sends the data message to the routing module for processing; modulating the data message generated by the routing module into an analog signal and sending the analog signal to the radio frequency module;
the routing module is responsible for analyzing the received data message and terminating the network transmission of the data message according to an ad hoc network routing protocol or selecting a next hop node of the network to continue transmitting the data message; or generating a data message and sending the data message to the next hop node of the network according to the ad hoc network routing protocol;
the battery power supply module can continuously supply power for a long time when the terminal is in a mobile and portable state;
the video communication terminal has three different working modes in the wireless ad hoc network, namely a video communication state, an intermediate forwarding state and a standby state; video communication state: a calling terminal and a called terminal which carry out video communication are in a video communication state; intermediate forwarding state: forwarding communication data of a calling terminal and a called terminal only according to an ad hoc network routing protocol, wherein the video communication terminal in an intermediate forwarding state does not display video communication information and serves as an intermediate node of the ad hoc network; standby state: other nodes that do not participate in video communication data forwarding exist as ad hoc networks.
8. The wireless ad hoc network video communication terminal according to claim 7, wherein: one video communication terminal can be simultaneously positioned in a plurality of video communication connections of the wireless ad hoc network and respectively positioned in different working modes, one video communication terminal can be simultaneously positioned in an intermediate forwarding state or a standby state in different video communication connections at the same time, but one video communication terminal cannot be simultaneously positioned in a video communication state in the plurality of video communication connections.
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