CN103442339A - Method, device and system for achieving PTT service - Google Patents
Method, device and system for achieving PTT service Download PDFInfo
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- CN103442339A CN103442339A CN2013103654915A CN201310365491A CN103442339A CN 103442339 A CN103442339 A CN 103442339A CN 2013103654915 A CN2013103654915 A CN 2013103654915A CN 201310365491 A CN201310365491 A CN 201310365491A CN 103442339 A CN103442339 A CN 103442339A
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Abstract
The invention discloses a method, device and system for achieving a PTT service. The method for achieving the PTT service is applied to a multicast device set, wherein the multicast device set comprises at least two multicast devices. The method for achieving the PTT service comprises the steps that (1) when any one of the multicast devices of the multicast device set receives a sending instruction of communication information, communication information is packaged to be an IP data package; (2) the IP data package comprises an IP multicast address which corresponds to the multicast device set; (3) the IP data package is sent to a network device of an IP network through a communication channel which has been built between the current multicast device and the IP network, and the network device is triggered to send the IP data package to other multicast devices in the multicast device set according to the IP multicast address. According to the method for achieving the PTT service, the multicast devices trigger the IP network device to enable the IP network device to send the IP data package which comprises the communication information of the PTT service, a basic device of the IP network is made full use of, and the achievement mode of the PTT service is simple, convenient and low in cost.
Description
Technical field
The invention belongs to communication technical field, relate in particular to a kind of method, equipment and system of the PTT of realization business.
Background technology
PTT(Push-To-Talk), as the term suggests be that a button is just spoken.In this day and age, people always wish that a button just can converse immediately, and first dial 11 figure places unlike public's mobile phone.PTT can realize that calling subscriber one is by emission key, and all called subscribers in same channel can receive, its call set-up time is extremely short.
Conventional PTT business is mainly the mode that adopts analog fm at present, but this kind of mode continued to use many decades, along with technological progress, conventional wireless professional net is also progressively to digital development, but it is complicated that these proprietary wireless technologys realize, with high costs, and speech business is only arranged, can't realize transmission of video.In order to realize the transmission of video in the PTT business, each producer mainly promotes a kind of special-purpose broadband multimedia cluster system now, this system needs the support of the equipment such as large-scale radio communication base station and rear end switching center, and the use of professional switching equipment has increased the complexity of PTT business realizing equally.
Yet VoIP(Voice over Internet Protocol now) technology is ripe, realize the PTT business in conjunction with voip technology and ripe wireless communication technique, can greatly reduce equipment cost, and increase the multi-media communication ability, comprise the Audio and Video function.Voip technology generally has multiple implementation, with SIP, is H.323 respectively the standard that the large camp of field of telecommunications and internet arena two releases.But its design object and PTT business have essential distinction, use the system of these two standard implementation PTT need to develop professional equipment, as professional gateway, professional switch etc., system implementation complexity and cost are higher, therefore can not be applicable to well the PTT business.
Summary of the invention
In view of this, the invention provides a kind of method, equipment and system of the PTT of realization business, by conjunction with the IP technology, utilize the infrastructure device that IP network provides to realize the PTT business, thereby realize purpose low-cost, low complex degree.
For achieving the above object, the invention provides following technical scheme:
A kind of method that realizes the PTT business, described method is applied to the multicast device group, and described multicast device group comprises at least two multicast devices, and described method comprises:
When any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
By this multicast device of having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
Preferably, the described communication information comprises: text message, audio-frequency information or video information.
Preferably, in the situation that the described communication information is audio-frequency information or video information, described by this multicast device of having set up and the communication channel between IP network, described IP Packet Generation to the network equipment in described IP network is comprised:
In the first Preset Time interval, whether idlely intercept this multicast device and the communication channel between IP network set up, described communication channel is the voice-grade channel corresponding with described audio-frequency information or the video channel corresponding with described video information;
If the described communication channel free time in described the first Preset Time interval, in the second Preset Time interval, whether idlely again intercept described communication channel, if in described the second Preset Time interval, the described communication channel free time, by described communication channel, by described IP Packet Generation to the network equipment in described IP network.
Preferably, described by this multicast device of having set up and the communication channel between IP network, by the IP Packet Generation to the network equipment in described IP network, trigger the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively, comprising:
By this multicast device of having set up and the communication channel between IP network, by described IP Packet Generation in described IP network with suitable the first tunnel device of this multicast device; By described the first tunnel device by described IP package forward to corresponding each second tunnel device respectively of other multicast device with in described multicast device group, and trigger described each second tunnel device described IP packet sent to other multicast device in described multicast device group.
Preferably, described each second tunnel device described IP package forward is extremely corresponding with other multicast device difference in described multicast device group by described the first tunnel device, and trigger described each second tunnel device described IP packet is sent to other multicast device in described multicast device group, comprising:
By described the first tunnel device by described IP package forward to transferring equipment;
Trigger described transferring equipment by described IP package forward to corresponding each second tunnel device respectively of other multicast device with in described multicast device group, and trigger described each second tunnel device described IP packet sent to other multicast device in described multicast device group.
A kind of multicast device of realizing the PTT business, described multicast device belongs in a multicast device group, includes at least two described multicast devices in described multicast device group, and described multicast device comprises:
Encapsulation unit, while for receive the communication information when this multicast device, sending instruction, be encapsulated as the IP packet by the described communication information; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
Transmitting element, for this multicast device by having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
Preferably, also comprise:
Audio coder, generate audio data frame for audio-frequency information being carried out to digital coding;
Video encoder, for carrying out video information digital coding generating video Frame;
The text code device, generate the text data frame for text message being carried out to text code.
Preferably, described transmitting element comprises:
Intercept subelement, for in the first Preset Time interval, whether idlely intercept this multicast device and the communication channel between IP network set up, described communication channel is the voice-grade channel corresponding with described audio-frequency information or the video channel corresponding with described video information; If the described communication channel free time in described the first Preset Time interval,, in the second Preset Time interval, whether idlely again intercept described communication channel;
Send subelement, for when described communication channel, in described the second Preset Time interval, during in idle condition, described IP packet being sent to the network equipment in described IP network by described communication channel.
A kind of system that realizes the PTT business comprises: the network equipment, the first tunnel device, transferring equipment, the second tunnel device and the described multicast device of claim 6 to 8 any one of supporting ip multicast; Wherein, described multicast device belongs in a multicast device group, includes at least two described multicast devices in described multicast device group;
Described multicast device, send the IP packet for the network equipment to described support ip multicast;
The network equipment of described support ip multicast, for by described IP packet, the first tunnel device that other multicast devices reach and this multicast device is suitable to described multicast device group is sent;
Described the first tunnel device, for the described IP package forward by receiving to described transferring equipment;
Described transferring equipment, for each second tunnel device that described IP package forward is extremely corresponding with other multicast device difference of described multicast device group;
Described the second tunnel device, for by described IP packet, other multicast device to described multicast device group is sent.
As can be seen here, beneficial effect of the present invention is: the method in the PTT of realization business disclosed by the invention is applied to the multicast device group, described multicast device group comprises at least two multicast devices, described method comprises: when any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet, and by this multicast device of having set up and the communication channel between IP network, by described IP Packet Generation to the network equipment in described IP network, triggering the described network equipment is sent described IP packet respectively according to described ip multicast address to other multicast devices in described multicast device group.In described method, between multicast device and IP network, establish a communications link, transmission is used for the IP packet of transmission information to the IP network connected with it, and the network equipment triggered in described IP network is sent described IP packet to other multicast devices.Described multicast device is encapsulated as the IP packet by the communication information, triggers IP network equipment utilization IP network channel and sends the packet that comprises PTT service communication information.The implementation of described method, do not need additionally to develop professional equipment, so implementation is easy in conjunction with the existing network infrastructure device provided in IP network for multicast device, lower cost.Utilize described method to can be used for video communication equipment simultaneously and realize video capability, this equipment does not need special-purpose switching center's equipment can realize the message switching of video.
The accompanying drawing explanation
Fig. 1 is a kind of flow chart of the method for the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 2 is the another kind of flow chart of the method for the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 3 is another flow chart of the method for the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 4 is another flow chart of the method for the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 5 is a kind of structural representation of the equipment of the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 6 is the another kind of structural representation of the equipment of the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 7 is another structural representation of the equipment of the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 8 is a kind of structural representation of the system of the disclosed PTT of the realization business of the embodiment of the present invention;
Fig. 9 is the another kind of structural representation of the system of the disclosed PTT of the realization business of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out to clear, complete description, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
As shown in Figure 1, described method is applied to the multicast device group to a kind of flow process that the embodiment of the present invention is disclosed realizes the PTT operational approach, and described multicast device group comprises at least two multicast devices, and described method comprises:
S101: when any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
Ip multicast communication must depend on the ip multicast address, and in IPv4, it is a Class D IP address, and scope is from 224.0.0.0 to 239.255.255.255.A corresponding ip multicast address of multicast device group, the multicast device in described multicast device group is used described same ip multicast address, for example 224.0.0.5.
When any multicast device in described multicast group receives communication information transmission instruction, meaning has the demand that sends the communication information, described multicast device is encoded the described communication information to generate communication information message, after adding the IP protocol fields, the head of described communication information message is encapsulated as the IP packet, include IP destination address sign in described IP protocol fields, described sign is set to ip multicast address corresponding to described multicast device group, for example 224.0.0.5.
S102: by this multicast device of having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
Set up between described multicast device and IP network communication channel arranged, described multicast device by described communication channel by the IP Packet Generation that encapsulated for example, to the network equipment in described IP network, router or multilayer switch.The described network equipment is known the multicast device member in described multicast device group, and according to the ip multicast address in described IP packet, described IP packet is sent to other multicast devices in described multicast device group.
The present embodiment is disclosed to be realized in the method for PTT business, when any multicast device in described multicast group receives communication information transmission instruction, the communication information is encapsulated as to the IP packet, by the described multicast device set up and the communication channel between IP network, give the network equipment in described IP network by described IP Packet Generation, trigger and by the network equipment, described IP packet is sent to other multicast devices in described multicast device group.This kind realized utilizing the basic network equipment in described IP network in the method for PTT business, do not need additionally to develop professional equipment, and implementation is easy and with low cost.
Further, there is different types in the communication information that the PTT business can realize, as text message, audio-frequency information or video information.Any multicast device in described multicast device group receives communication information instruction difference, represents the communication type difference that described multicast device will be realized.While having a plurality of any multicast devices to receive dissimilar communication information instruction in described multicast device group simultaneously, described each arbitrarily multicast device use different channels type in the communication channel that itself and IP network set up to communicate the transmission of information, do not repel and interference each other, in the situation that in guaranteeing each multicast device group of synchronization, there is one in every kind of communication channel at most, transmission when having realized text that in same multicast group, different multicast devices send, audio frequency, video information.
Any multicast device that the method for the disclosed PTT of the realization business of the present embodiment is applied in the multicast device group sends in the situation of audio-frequency information or video information.As shown in Figure 2, described method is applied to the multicast device group to the another kind of flow process that the embodiment of the present invention is disclosed realizes the PTT operational approach, and described multicast device group comprises at least two multicast devices; Described method comprises:
S201: when any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
When any multicast device in described multicast device group receives audio-frequency information or video information communication information transmission instruction, described audio-frequency information or video information are encapsulated as to audio-frequency information IP packet or video information IP packet, and a kind of form of described IP packet is as shown in table-1:
| The IP destination address | Other | Channel type | Sequence number | The multicast device sign | Encrypt indication | The communication information |
Table-1
Wherein, the ip multicast address of the multicast device group that described IP destination address is described multicast device place, as 224.0.0.5; Other include the UDP(user data and control) protocol fields etc.; Described channel type means the data type in described IP packet, as 1 represent as described in data type in the IP packet be audio-frequency information, 2 represent that the data type in described IP packet is video information; Described sequence number means the order of the channel message of described IP packet; Described multicast device sign means the identification number of the multicast device of the described IP packet of transmission, as No. 1; If the channel message data in described IP packet is encrypted by default encryption rule, described encryption indication means described encryption rule, as 1 expression symmetric encipherment algorithm; The described communication information means the audio-frequency information or the video information content that send.Described sequence number, multicast device sign and encryption are designated as option.
S202: in the first Preset Time interval, whether idlely intercept this multicast device and the communication channel between IP network set up, described communication channel is the voice-grade channel corresponding with described audio-frequency information or the video channel corresponding with described video information; If the described communication channel free time in described the first Preset Time interval, carry out S203; If described communication channel is not idle in described the first Preset Time interval, carry out S205;
The first Preset Time be spaced apart one section regular time interval.Any multicast device in described multicast device group is set up the Socket(socket), intercept in one section Fixed Time Interval on the voice-grade channel that described this multicast device and IP network set up and whether have audio-frequency information IP packet or voice-grade channel to control the IP packet, or intercept on video channel and whether have video information IP packet or video channel to control the IP packet.Wherein, channel is controlled the IP packet as shown in table-2:
| The IP destination address | Other | Channel type | Sequence number | The multicast device sign |
Table-2
Wherein, shown in channel type mean that voice-grade channel is controlled or video channel is controlled, as 3 expression voice-grade channels are controlled, 4 mean that video channels control.
Receive the IP packet in described Fixed Time Interval as described Socket, can learn the type of described IP packet by the channel type sign of checking described IP packet, audio-frequency information IP packet, video information IP packet, voice-grade channel are controlled IP packet or video channel control IP packet.
When described IP packet is audio-frequency information IP packet or video information IP packet, mean that on described voice communication channel, existing multicast device is communicating the transmission of information, described multicast device finishes the transmission of the communication information, can utilize described Socket to receive described audio-frequency information IP packet or video information IP packet, and the broadcasting of decoding, realize audio reception information or video information.
When described IP packet is voice-grade channel control IP packet or video channel control IP packet, expression has other multicast device at the described voice-grade channel of competition or video channel, and described multicast device finishes to intercept.
S203: in the second Preset Time interval, whether idlely again intercept described communication channel, if in described the second Preset Time interval, the described communication channel free time, carry out S204; If, in described the second Preset Time interval, described communication channel is not idle, carry out S205;
Described the second Preset Time is spaced apart one section random time interval of generation.Described multicast device sends voice-grade channel and controls IP packet or video channel control IP packet in described random time interval, is used for competing described voice-grade channel or video channel.Simultaneously by the described Socket(socket of setting up) again intercept the IP packet whether described voice-grade channel or video channel exist other multicast devices.
If in described random time interval, described multicast device does not listen to audio-frequency information IP packet or video information IP packet in described voice-grade channel or video channel, mean described voice-grade channel or video channel free time, by described communication channel, by described IP Packet Generation to the network equipment in described IP network.
When if the IP packet listened to is voice-grade channel control IP packet or video channel control IP packet, mean has other multicast devices in the competition of carrying out described voice-grade channel or video channel simultaneously, described multicast device does not exit the work of competitive channel, still within the described random time interval, transmitting channel is controlled the IP packet, is used for and described other multicast device competitive channels.
If when listening to the IP packet and being audio-frequency information IP packet or video information IP packet, mean to have had other multicast device more first to compete described communication channel success, sending the communication information, described multicast device finishes to intercept.Receive described IP packet the broadcasting of decoding simultaneously, realize the reception of audio-frequency information or video information.
S204: by described communication channel, by described IP Packet Generation to the network equipment in described IP network;
The channel type of intercepting according to described multicast device, the audio-frequency information IP packet that encapsulated or video information IP Packet Generation, to the network equipment in described IP network, are triggered to the described network equipment and according to the ip multicast address in described IP packet, described IP packet sent to other multicast devices in described multicast device group respectively.
S205: finish to intercept.
Any multicast device that the method for the disclosed PTT of the realization business of the present embodiment is applied in the multicast device group sends in the situation of audio-frequency information or video information.Before sending audio-frequency information or video information, whether idlely need intercept described voice-grade channel or video channel.Multicast device described in described method all carries out intercepting work twice before utilizing voice-grade channel or video channel, and intercepting for the first time is within the default time interval, to intercept whether to have the IP packet, if exist, finishes to intercept.Intercept for the second time is within the random time interval, to intercept whether to have the IP packet, control IP packet or video channel control IP packet if there is voice-grade channel, mean that other multicast devices compete described channel at the same time, now do not exit the competition of channel, continue transmitting channel and control the IP packet, if have audio-frequency information IP packet or video information IP packet, mean that other multicast devices more first compete to channel, in transmission, utilize described channel to send the communication information, described multicast device finishes to intercept.
In reality, may exist and have two above multicast devices to carry out before audio-frequency information or video information communication competing the situation of communication channel simultaneously simultaneously, if whether the work of only intercepting for the first time intercept channel within one period default time interval idle, if the free time sends the communication information, may cause and have two above multicast devices to send the communication information simultaneously simultaneously, thereby lead to a conflict.And the disclosed method that realizes the PTT business of the present embodiment, again intercepted work within one period random time interval, if there is two above multicast devices situation of competitive channel simultaneously simultaneously, in described random time interval, any one described multicast device competitive channel successfully can allow other multicast device end of competitive channel simultaneously intercept work, thereby has effectively evaded the generation of conflict.
Same multicast device group comprises at least two multicast devices, if described multicast device is in different local area network (LAN)s, and in these two local area network (LAN)s, do not have three-tier switch or router to carry out the forwarding of multicast packets, described multicast device is in different ip multicast territories.The IP packet that described any multicast device in described ip multicast territory sends, need reception the forwarding of process of passing through tunnel equipment, to realize that between the different IP multicast domain, the multicast device in same multicast device group is realized the PTT business.Another method of the disclosed PTT of the realization business of this embodiment is applied in this kind of scene, and the flow process of described method as shown in Figure 3, comprising:
S301: when any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
S302: by this multicast device of having set up and the communication channel between IP network, by described IP Packet Generation in described IP network with suitable the first tunnel device of this multicast device; By described the first tunnel device by described IP package forward to corresponding each second tunnel device respectively of other multicast device with in described multicast device group, and trigger described each second tunnel device described IP packet sent to other multicast device in described multicast device group.
The corresponding same tunnel device of a plurality of described multicast device in each ip multicast territory, or the respectively corresponding tunnel device of each multicast device.The corresponding same tunnel device of a plurality of described multicast device in the territory of same ip multicast described in the present embodiment.Refer to Fig. 8, corresponding the first tunnel device 802 of ip multicast territory A, corresponding the second tunnel device 803 of ip multicast territory B.
Described tunnel device application tunneling technique.The IP address of the IP packet adding purpose tunnel device that it is the ip multicast address by destination address that described tunneling technique refers in the porch in tunnel is packaged into an IP packet, with route transmission in the internet not supporting multicast, in the exit that arrives tunnel, seal off and revert to original data packet format.Wherein, the non-ip multicast address, this IP address of interpolation.The IP packet that described destination address is the ip multicast address is called the multicast bag.
In the disclosed method of the present embodiment, the corresponding same tunnel device of a plurality of described multicast devices in same ip multicast territory, between described tunnel device, external interface is the UDP link.Refer to Fig. 8, any multicast device in the A of ip multicast territory is that transmit leg multicast device 801 is when receiving the communication information and sending instruction, the multicast bag of packaging information is sent to described the first tunnel device 802, dispose the IP address of the second tunnel device 803 of ip multicast territory B in described the first tunnel device 802, after being added to udp protocol field and IP protocol fields, described multi-case data packet header is encapsulated as the packet that can transmit between tunnel device, wherein, the IP address that the IP destination address in described IP protocol fields is described the second tunnel device 803.Described packet is forwarded to described the second tunnel device 803 by the first tunnel device 802, triggers that described the second tunnel device 803 receives described packets and recipient's multicast device 804 that it is disassembled in the ip multicast territory B that reverts to original multicast Bao Bingxiang the second tunnel device 803 places is sent.
The present embodiment is disclosed realizes that in the method for PTT business, the multicast device in described same multicast device group is in different ip multicast territories.Due to the described IP destination address packet that is the ip multicast address can not be between each ip multicast territory direct route transmission, the tunnel device in this method will be encapsulated behind the IP address of described multicast bag adding purpose tunnel device, can between the ip multicast territory, transmit, with this, realize the PTT business between the multicast device in same multicast device group between the ip multicast territory.
Further, if the tunnel device external interface in the method for the disclosed PTT of the realization business of a upper embodiment does not possess the IP address of public network, need transferring equipment to carry out the forwarding of packet.Another method of the disclosed PTT of the realization business of the present embodiment is applied in this scene, and described method flow as shown in Figure 4, comprising:
S401: when any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
S402: by this multicast device of having set up and the communication channel between IP network, by described the first tunnel device by described IP package forward to transferring equipment; Trigger described transferring equipment by described IP package forward to corresponding each second tunnel device respectively of other multicast device with in described multicast device group, and trigger described each second tunnel device described IP packet sent to other multicast device in described multicast device group.
Refer to Fig. 9, the first tunnel device in described ip multicast territory A does not possess public network IP address, need to be forwarded in described transferring equipment 904, and wherein, described transferring equipment 904 possesses public network IP address.The IP address of the described transfer server 904 of configuration on described the first tunnel device 903 and the second tunnel device 905, the IP address of described the first tunnel device 903 of configuration and the second tunnel device 905 on transfer server 904.Packet Generation to the first tunnel device 903 that transmit leg multicast device 901 in described ip multicast territory A is the ip multicast address by destination address, trigger described the first tunnel device 903 and receive the packet that described destination address is the ip multicast address, and be encapsulated as the IP Packet Generation to described transfer server 904 add the IP address of described transfer server at its head after, trigger described transfer server 904 by described IP package forward to described the second tunnel device 905.
The present embodiment is disclosed to be realized if tunnel device does not possess public network IP address, by the transferring equipment that possesses public network IP address, being forwarded in the method for PTT business, has realized the PTT business of the multicast device between the different IP multicast domain.
A kind of structure that the present embodiment discloses the multicast device of realizing the PTT business as shown in Figure 5, described multicast device belongs in a multicast device group, include at least two described multicast devices in described multicast device group, described multicast device comprises: encapsulation unit 501 and data transmission unit 502.
Described encapsulation unit 501, while for receive the communication information when this multicast device, sending instruction, be encapsulated as the IP packet by the described communication information; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
Described transmitting element 502, for this multicast device by having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
Each multicast device group has an ip multicast address, and any multicast device in described multicast device group all utilizes described ip multicast address to realize the PTT business.The sign of pre-configured described multicast device, comprise user name, Subscriber Number, place sets of numbers, the ip multicast address of the corresponding place of wherein said sets of numbers multicast device group.
When any one described multicast device in described multicast device group receives communication information transmission instruction, the encapsulation unit 501 of described multicast device is encapsulated as the IP packet after the described communication information is added to the IP protocol fields, wherein, the destination address of described IP packet is described ip multicast address.Transmitting element 502 to the network equipment in described IP network, triggers described IP Packet Generation the described network equipment and according to described ip multicast address, described IP packet is sent to other multicast devices.The disclosed multicast device of the present embodiment will comprise the IP Packet Generation of the communication information to IP network equipment, trigger IP network equipment and send the IP packet that comprises PTT service communication information, the implementation of this kind of PTT business takes full advantage of the infrastructure device that IP network provides, do not need again to develop, implementation is easier, cheap.
The another kind of structure that the present embodiment discloses the multicast device of realizing the PTT business as shown in Figure 6, in the scene that it is audio-frequency information, video information or text message that described multicast device is applied in the communication information sent.Described multicast device comprises: audio coder 601, video encoder 602, text code device 603, encapsulation unit 604 and transmitting element 605.
Described audio coder 601, generate audio data frame for audio-frequency information being carried out to digital coding;
Described video encoder 602, for carrying out video information digital coding generating video Frame;
Described text code device 603, generate the text data frame for text message being carried out to text code;
Described encapsulation unit 604, while for receive the communication information when this multicast device, sending instruction, be encapsulated as the IP packet by the described communication information; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
Described transmitting element 605, for this multicast device by having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
Audio coder in the multicast device of the disclosed PTT of the realization business of the present embodiment, video encoder and text code device have been realized respectively the coding of audio-frequency information, video information, text message, to send through encapsulation through audio-frequency information, video information or the text message of coding, realized the communication of voice, video or note in the PTT business.
Further, can also comprise ciphering unit in the disclosed multicast device structure of the embodiment shown in Fig. 6, for described audio data frame, video data frame or text data frame through coding is encrypted, and be encrypted indication in packaged IP packet, show the encryption rule that ciphering unit is used, thus the fail safe of guarantee information transport process.
Before the multicast device of the disclosed PTT of the realization business of the present embodiment is applied in and sends audio-frequency information or video information, situation about need to be intercepted used communication channel.As shown in Figure 7, the structure of described multicast device comprises: audio coder 701, video encoder 702, text code device 703, encapsulation unit 704, intercept subelement 705 and send subelement 706.
The described subelement 705 of intercepting, for in the first Preset Time interval, whether idlely intercept this multicast device and the communication channel between IP network set up, described communication channel is the voice-grade channel corresponding with described audio-frequency information or the video channel corresponding with described video information; If the described communication channel free time in described the first Preset Time interval,, in the second Preset Time interval, whether idlely again intercept described communication channel;
The first Preset Time is one section Fixed Time Interval, and the second Preset Time is one period random time interval.The described word cell of intercepting is set up the Socket(socket) intercept described voice-grade channel or whether video channel exists the IP packet, audio-frequency information IP packet, video information IP packet, voice-grade channel are controlled the IP packet or video channel is controlled the IP packet.
The described subelement of intercepting carries out intercepting work twice, intercept for the first time described voice-grade channel or video channel, if have audio-frequency information IP packet or video information IP packet on described voice-grade channel or video channel, the existing multicast device of explanation is in the transmission of carrying out audio-frequency information or video information; If exist voice-grade channel to control the IP packet on described voice-grade channel or video channel or video channel is controlled the IP packet, the existing multicast device of explanation is at war with carrying out audio-frequency information or video information.Above two kinds of situations, all represent that described voice-grade channel or video channel are not idle.Do not receive described IP packet if intercept for the first time, intercept for the second time work, if do not receive described audio-frequency information IP packet or video information IP packet in random a period of time interval, represent described channel idle; If receive described audio-frequency information IP packet or video information IP packet, mean that other multicast devices that described channel has been intercepted simultaneously compete successfully, represent that described channel is not idle, now described multicast device does not carry out the transmission of packet, has evaded a plurality of described multicast devices in same multicast device group and has sent the conflict that packet produces simultaneously.
Described transmission subelement 706, for during in idle condition, being sent to the network equipment in described IP network by described IP packet by described communication channel when described communication channel in described the second Preset Time interval.
The multicast device group comprises at least two described multicast devices, in reality, may exist a plurality of described multicast devices in same multicast device group to intercept the situation of channel before sending audio-frequency information or video information simultaneously, the disclosed multicast device of the present embodiment carries out intercepting work twice, evaded a plurality of described multicast devices in described same multicast device group and intercepted the conflict that issuable transmission packet produces simultaneously, improved the communication information in the communication process and sent successful possibility.
The system that the present embodiment is disclosed realizes the PTT business as shown in Figure 9, comprising: the first tunnel device 902, transferring equipment 903, the second tunnel device 904, support the network equipment 906 and the described multicast device 901 of claim 6 to 8 any one of ip multicast; Wherein, described multicast device belongs in a multicast device group, includes at least two described multicast devices in described multicast device group;
Described multicast device 901, send the IP packet for the network equipment to described support ip multicast;
The network equipment 902 of described support ip multicast, for by described IP packet, the first tunnel device that other multicast devices reach and this multicast device is suitable to described multicast device group is sent;
Wherein, the network equipment of described support ip multicast, router as three-tier switch or support ip multicast, the IP package forward that described ip multicast equipment is used for this ip multicast territory multicast device is sent is to other multicast devices in the same multicast device group in described multicast domain, and to this ip multicast territory, the first corresponding tunnel device is sent simultaneously.
Described the first tunnel device 903, for the described IP package forward by receiving to described transferring equipment;
Described transferring equipment 904, for each second tunnel device that described IP package forward is extremely corresponding with other multicast device difference of described multicast device group;
Described the second tunnel device 905, for by described IP packet, other multicast device to described multicast device group is sent.
In described ip multicast territory A, transmit leg multicast device 901 sends the IP packet to the network equipment 902 of described support ip multicast, support the network equipment 902 of ip multicast to send the IP packet to the recipient's multicast device 907 in the A of this ip multicast territory, realize the PTT business in this ip multicast territory, the network equipment of wherein said support ip multicast can be for realizing the switch of ip multicast package forward work in the ip multicast territory.Send the IP packet to the first tunnel device 903, described the first tunnel device 903 does not possess public network IP address, needs described transferring equipment 904 to be forwarded simultaneously, and wherein, described transferring equipment 904 possesses public network IP address.
The IP address of the described transfer server 904 of configuration on described the first tunnel device 903 and the second tunnel device 905, the IP address of described the first tunnel device 903 of configuration and the second tunnel device 905 on transfer server 904.
Packet Generation to the first tunnel device 903 that transmit leg multicast device 901 in described ip multicast territory A is the ip multicast address by destination address, trigger described the first tunnel device 903 and receive the packet that described destination address is the ip multicast address, and be encapsulated as the IP Packet Generation to described transfer server 904 add the IP address of described transfer server at its head after, trigger described transfer server 904 by described IP package forward to described the second tunnel device 905, described the second tunnel device 905 sends the IP packet to the multicast device in the B of ip multicast territory.
Realized the combination of wireless communication technology and IP technology in the system of the disclosed PTT of the realization business of the present embodiment, trigger IP network equipment by multicast device and send the IP packet that comprises PTT service communication information, this kind realizes that the system of PTT business takes full advantage of the basic network equipment that IP network provides, do not need again to research and develop the network equipment for the PTT business realizing, implementation is easier, cheap.Native system has both been realized sending the function of the communication information to the multicast device in other ip multicast territories by tunnel device and transferring equipment again to multicast device in this ip multicast territory in addition.
It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
The above method to a kind of PTT of realization business provided by the present invention, equipment and system are described in detail, and to the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a method that realizes the PTT business, is characterized in that, described method is applied to the multicast device group, and described multicast device group comprises at least two multicast devices, and described method comprises:
When any multicast device in described multicast device group receives communication information transmission instruction, the described communication information is encapsulated as to the IP packet; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
By this multicast device of having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
2. method according to claim 1, is characterized in that, the described communication information comprises: text message, audio-frequency information or video information.
3. method according to claim 2, it is characterized in that, in the situation that the described communication information is audio-frequency information or video information, described by this multicast device of having set up and the communication channel between IP network, described IP Packet Generation to the network equipment in described IP network is comprised:
In the first Preset Time interval, whether idlely intercept this multicast device and the communication channel between IP network set up, described communication channel is the voice-grade channel corresponding with described audio-frequency information or the video channel corresponding with described video information;
If the described communication channel free time in described the first Preset Time interval, in the second Preset Time interval, whether idlely again intercept described communication channel, if in described the second Preset Time interval, the described communication channel free time, by described communication channel, by described IP Packet Generation to the network equipment in described IP network.
4. method according to claim 1, it is characterized in that, described by this multicast device of having set up and the communication channel between IP network, by the IP Packet Generation to the network equipment in described IP network, trigger the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively, comprising:
By this multicast device of having set up and the communication channel between IP network, by described IP Packet Generation in described IP network with suitable the first tunnel device of this multicast device; By described the first tunnel device by described IP package forward to corresponding each second tunnel device respectively of other multicast device with in described multicast device group, and trigger described each second tunnel device described IP packet sent to other multicast device in described multicast device group.
5. method according to claim 4, it is characterized in that, described each second tunnel device described IP package forward is extremely corresponding with other multicast device difference in described multicast device group by described the first tunnel device, and trigger described each second tunnel device described IP packet is sent to other multicast device in described multicast device group, comprising:
By described the first tunnel device by described IP package forward to transferring equipment;
Trigger described transferring equipment by described IP package forward to corresponding each second tunnel device respectively of other multicast device with in described multicast device group, and trigger described each second tunnel device described IP packet sent to other multicast device in described multicast device group.
6. a multicast device of realizing the PTT business, is characterized in that, described multicast device belongs in a multicast device group, includes at least two described multicast devices in described multicast device group, and described multicast device comprises:
Encapsulation unit, while for receive the communication information when this multicast device, sending instruction, be encapsulated as the IP packet by the described communication information; In described IP packet, include and the corresponding ip multicast of described multicast device group address;
Transmitting element, for this multicast device by having set up and the communication channel between IP network, described IP Packet Generation, to the network equipment in described IP network, is triggered to the described network equipment and according to described ip multicast address, described IP packet sent to other multicast devices in described multicast device group respectively.
7. multicast device according to claim 6, is characterized in that, also comprises:
Audio coder, generate audio data frame for audio-frequency information being carried out to digital coding;
Video encoder, for carrying out video information digital coding generating video Frame;
The text code device, generate the text data frame for text message being carried out to text code.
8. multicast device according to claim 7, is characterized in that, described transmitting element comprises:
Intercept subelement, for in the first Preset Time interval, whether idlely intercept this multicast device and the communication channel between IP network set up, described communication channel is the voice-grade channel corresponding with described audio-frequency information or the video channel corresponding with described video information; If the described communication channel free time in described the first Preset Time interval,, in the second Preset Time interval, whether idlely again intercept described communication channel;
Send subelement, for when described communication channel, in described the second Preset Time interval, during in idle condition, described IP packet being sent to the network equipment in described IP network by described communication channel.
9. a system that realizes the PTT business, is characterized in that, comprising: the network equipment, the first tunnel device, transferring equipment, the second tunnel device and the described multicast device of claim 6 to 8 any one of supporting ip multicast; Wherein, described multicast device belongs in a multicast device group, includes at least two described multicast devices in described multicast device group;
Described multicast device, send the IP packet for the network equipment to described support ip multicast;
The network equipment of described support ip multicast, for by described IP packet, the first tunnel device that other multicast devices reach and this multicast device is suitable to described multicast device group is sent;
Described the first tunnel device, for the described IP package forward by receiving to described transferring equipment;
Described transferring equipment, for each second tunnel device that described IP package forward is extremely corresponding with other multicast device difference of described multicast device group;
Described the second tunnel device, for by described IP packet, other multicast device to described multicast device group is sent.
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