CN103024685B - A kind of multichannel PTT system and implementation method - Google Patents
A kind of multichannel PTT system and implementation method Download PDFInfo
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- CN103024685B CN103024685B CN201210522373.6A CN201210522373A CN103024685B CN 103024685 B CN103024685 B CN 103024685B CN 201210522373 A CN201210522373 A CN 201210522373A CN 103024685 B CN103024685 B CN 103024685B
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Abstract
A kind of multichannel PTT system and implementation method, comprise multiple PTT clients and a ptt server, described ptt server comprises resolver, between described multiple PTT clients and described ptt server, realizes RTP transmission of voice packets by common frequency channel and/or restricted channels; Described multiple PTT client is all arranged in common frequency channel, and selectable being arranged in restricted channels; The multiple PTT clients of PTT client in having the right to ptt server application to common frequency channel send RTP voice packets; The PTT client being arranged in restricted channels is had the right to ptt server application, and sends RTP voice packet by described resolver ruling to the PTT client in corresponding restricted channels. PTT system of the present invention can have different channel to carry out optionally voice transfer, and the relative common frequency channel of function of grouping busy between PTT client in specific channel is shielded, and has strengthened the confidentiality of PTT system.
Description
Technical field
The present invention relates to be specially adapted for business or the facility that in cordless communication network, button is said or button exhales, especiallyRelate to a kind of multichannel PTT system and implementation method.
Background technology
PTT(Push-To-Talk) refer to a kind of mobile phone service, adopt the mode of PoC, be similar to radioThe intercommunication mode of words, as long as can converse by next button, is called again " PTT ", and it is traditional right in function, to be similar toSay machine. Prior art PTT system comprises multiple PTT clients (PTTClient) and a ptt server (PTTServer), as shown in Figure 1, system comprises multiple PTT clients 10 '---PTTClient1 ~ PTTClientn and onePTTServer20 ', PTTServer comprises resolver 21 ', PTT client can be arranged on the mobile terminal that user usesUpper, user uses it to carry out PTT call, after press-to-talk, just can, to ptt server application right of speech, RTP voice packet be sent outGive PTTServer, if applied for successfully, the voice packet of PTT client is sent to same broadcast address by ptt server, so thatPTTClient receives, and PTTServer monitors the RTP voice packet in same broadcast address. In actual use, may have manyIndividual PTTClient wants to speak simultaneously, and now, the resolver 21 ' in PTTServer can determine the language of PTTClientPower. Compare common making a phone call, PTT largest benefit is to have the function of grouping busy, namely people speaks, and other people have this and establishStandby people can hear. The staff of some company, mechanism (as hotel, airport) or tissue (as construction team), they are generalIn a smaller scope, work together simultaneously, and need continually with scope in other people speak simultaneously, soIf use PTT to bring great convenience to them, because he is as long as talk facing to PTT at any time, other people can hear,And needn't inform by telephone singly. But prior art only can be broadcast to institute by RTP voice packet by ptt serverThere is PTT client, need the PTT client on address and RTP voice packet selectively cannot be broadcast to part, cannot realizeControl of authority.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the present invention, for solving prior art defect and deficiency, proposes a kind ofHold multichannel PTT system, can realize RTP voice packet and selectively be broadcast to the PTT client with corresponding authority.
The technical scheme that technical solution problem of the present invention adopts is as follows:
A kind of multichannel PTT system, comprises multiple PTT clients and a ptt server, and described ptt server comprisesResolver, realizes RTP language by common frequency channel and/or restricted channels between described multiple PTT clients and described ptt serverThe transmission of sound bag; Described multiple PTT client is all arranged in common frequency channel, and selectable being arranged in restricted channels; PTTThe multiple PTT clients of client in having the right to ptt server application to common frequency channel send RTP voice packets; Be arranged on and be subject toThe PTT client of limit in channel had the right to ptt server application, and by described resolver ruling in corresponding restricted channelsPTT client sends RTP voice packet.
Described common frequency channel is one, and described restricted channels is at least one.
Described RTP voice packet transmits by RTP.
The gland form of described RTP voice packet comprises extension header form, and this extension header form comprises the same of current talkingStep information source mark and channel identication. Described resolver according to synchronous source identifier and channel identification in corresponding restricted channelsPTT client sends RTP voice packet.
The present invention also provides a kind of implementation method of multichannel PTT system, for multiple PTT clients and PTT clothesVoice transfer between business device, described ptt server comprises for determining that voice send the resolver of channel, comprise following stepRapid:
A. multiple PTT clients are all arranged in common frequency channel, specific PTT client is arranged in restricted channels;
The gland form of the RTP voice packet B. PTT client being sent is expanded, and in extension header form, identifiesSynchronous information source mark and channel identification, to determine authority and the channel type of PTT client;
C., when described PTT client is to described ptt server application right of speech, the resolver in ptt server is according to connecingSynchronous information source mark and channel identication in the RTP voice packet extension header form of the PTT client of receiving, to determine RTP voicePacket broadcast is to common frequency channel or restricted channels.
In described step B, comprise the steps:
Synchronous information source mark in extension header form in the RTP voice packet that described PTT client sends is for determining PTTThe right of speech rank of client, when the value of the synchronous information source mark of current RTP voice packet is 0x1, described PTT client has to be sent outPower seized in speech; The value of the synchronous information source mark of current RTP voice packet in the time of interval 0x2 ~ 0xFFFFFF, described PTT clientPower is not seized in speech, can only in the time that PTT client in no third side is made a speech, apply for obtaining the floor; Current RTP voice packet sameThe value of step information source mark is in the time of interval 0x1000000 ~ 0xFFFFFFFF, and described PTT client does not have right to speak.
In described step B, also comprise the steps:
Channel identication in extension header form in the RTP voice packet that described PTT client sends is for determining PTT clientThe channel of end, when the value of the channel identication of current RTP voice packet is 0x1, described PTT client is arranged on common frequency channel; CurrentThe value of the channel identication of RTP voice packet is in the time of interval 0x2 ~ 0xFFFFFFFF, and described PTT client is arranged on restricted channels.
Described step C specifically comprises step: in the time that ptt server receives the RTP voice packet of PTT client, judge instituteAfter stating RTP voice packet, whether there is speech data, do not have speech data to judge that this PTT client abandons right to speak, otherwise pass throughThe value of synchronous information source mark of current RTP voice packet and the value of channel identication judge the competence of speech of described PTT client and toCorresponding channel speech.
Compared with prior art, the present invention has adopted multichannel PTT system, by multiple PTT clients and PTT serviceDevice is arranged on common frequency channel and restricted channels is carried out voice data transmission, is undertaken by the RTP voice packet that PTT client is sentThe expansion of gland form, the synchronous information source that current talking is set in expansion identifies and channel identication, so that PTT serviceDevice can go out the competence of speech of PTT client and will have speech according to synchronous information source mark and the channel identication ruling of current talkingThe RTP voice packet that the PTT client of power sends sends to other PTT clients with the forms of broadcasting, for the judgement merit of resolverThe improvement of energy, makes PTT system can have different channel to carry out optionally voice transfer, makes PTT client in specific channelThe relative common frequency channel of function of grouping busy between end shields, and has strengthened the confidentiality of PTT system. And, RTP voice packet is consolidatedThe implementation of fixed form expansion is fairly simple, is easy to realize, and only can make PTT by synchronous information source mark and channel identicationServer is made correct ruling, is convenient to design and the popularization of system.
Brief description of the drawings
Fig. 1 is the operation principle block diagram of prior art PTT system.
Fig. 2 is the operation principle block diagram that the present invention supports multiple channel PTT systems.
Fig. 3 is the process chart that the present invention supports the implementation method of multiple channel PTT systems.
Detailed description of the invention
For making object of the present invention, technical scheme and advantage clearer, clear and definite, referring to the accompanying drawing embodiment couple that develops simultaneouslyThe present invention further describes. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, and need notIn limiting the present invention.
As shown in Figure 2, the present invention supports multiple channel PTT systems to comprise multiple PTT clients 10---PTTClient1 ~ PTTClientn and a ptt server 20, described ptt server 20 comprises resolver 21, described multiple PTT clients10 and described ptt server 20 between realize RTP transmission of voice packets by common frequency channel and/or restricted channels; By PTT clientAnd the channel that the transmission of carrying out speech data between ptt server adopts adopts the channel of two types: common frequency channel and limitedChannel, object is that the PTT client of same level is classified, and makes can take by PTT between the PTT client of authorityBusiness device is broadcast in specific restricted channels, and the PTT client that makes to be set in restricted channels just can receive corresponding RTP languageSound bag. Because common frequency channel can be used by all PTT clients, therefore, common frequency channel only arranges one, and described limitedChannel is at least one, can be also multiple, can set according to the needs that use, and comes according to the level of PTT clientDivide setting. And the described RTP voice packet of PTT client and the transmission of ptt server part is to enter by RTPRow transmission.
Described multiple PTT client 10 is all arranged in common frequency channel, and selectable being arranged in restricted channels;PTT client 10 has the right to apply for sending RTP voice packets to the multiple PTT clients in common frequency channel to ptt server 20; EstablishedThe PTT client of putting in restricted channels is had the right to ptt server application, and by described resolver ruling to corresponding restricted channelsInterior PTT client sends RTP voice packet. The gland form of described RTP voice packet comprises extension header form, these extension header latticeFormula comprises synchronous information source mark and the channel identication of current talking. Described resolver is according to synchronous source identifier and channel identificationPTT client in corresponding restricted channels sends RTP voice packet.
Shown in Fig. 3, be the flow chart of a kind of multichannel PTT of the present invention network system realization, the structure reference diagram of PTT system2, its implementation step is as follows:
S100, is all arranged on multiple PTT clients 10 in common frequency channel, and specific PTT client is arranged on limited frequencyIn road; For common frequency channel, arbitrary PTT client of multiple PTT clients all can be carried out RTP voice packet biography at this channelDefeated, in common frequency channel, all have right of speech, the PTT client in multichannel PTT system of the present invention all in common frequency channel,All PTT clients all have the right to apply for right of speech to ptt server 20. And that restricted channels can have is multiple, but have one at leastIndividual, setting up restricted channels is that specific part PTT client is listed in wherein, when the PTT client that is positioned at restricted channels is to PTTWhen right of speech on this channel of server application, only the PTT client in restricted channels just can be heard relevant voice.Certainly, for which PTT client be arranged in restricted channels, can be set voluntarily by user.
S200, the gland form of the RTP voice packet that PTT client 10 is sent is expanded, in extension header formIdentify synchronous information source mark and channel identification, to determine authority and the channel type of PTT client; PTT client 10 and PTTBetween server 20, carry out voice packet in voice transfer by RTP(RTP) realize, therefore by these voiceBag is called RTP voice packet, and which ptt server, receiving after the RTP voice packet of PTT client, need to determine by resolverA little PTT clients can obtain right of speech, and the RTP voice packet then these PTT clients being sent sends by the forms of broadcastingTo corresponding channel. For make ptt server can identify PTT client with and the channel at place (common frequency channel orWhich restricted channels), and make correct ruling, need to expand RTP voice packet, RTP gland form is generally adoptedUse following form:
01234567890123456789012345678901
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X|CC|M|PT|sequencenumber|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|timestamp|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|synchronizationsource(SSRC)identifier|
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
|contributingsource(CSRC)identifiers|
|....|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Wherein the 3rd " X " is extension flag position, if this flag bit is set to 1, represents to follow after RTP gland formWith a stature expansion, this flag bit is set as to 1, its RTP extension header form is as follows:
0123
01234567890123456789012345678901
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|definedbyprofile|length|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|headerextension|
|....|
If the extended bit position X in RTP gland form is set to 1, an adjustable length expansion is addedAfter RTP gland, an expanding packet is containing the length field of 16 bits, and in indication extension item, the number of 32 bits does not comprise 4Byte expansion head, therefore, 0 is virtual value. After RTP gland, only allowed a stature expansion, front 16 bits of extension are usedWith mark indications or parameter, the form of this 16 bit do not illustrate in RTP, but defined by concrete upper-layer protocol, byDo not need to use this 16 bit in PTT system, therefore need this 16 bit all to set to 0, its RTP extension header form is as follows:
0123
01234567890123456789012345678901
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0000000000000000|length（2）|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| the ssrc_curr| of current talking
| the channel channel| at place
In above-mentioned RTP extension header form, front 16 bits are " 0 ", and length (2) mark increases by two marks, " whenThe ssrc_curr of front call " and " the channel channel at place ", the ssrc_curr of current talking is 4 bytes, represents RTPSynchronous information source mark in voice packet gland form extended format, the channel channel at place is 4 bytes, represents channelMark.
The form expansion that the gland form of RTP voice packet is done is to increase synchronous information source ssrc and channel ChannelMark, and " the current talking ssrc_curr " of each PTT client be all unique, ptt server is with this synchronous information source markKnow and distinguish PTT client, and decide PTT client can obtain language on which channel in conjunction with the channel at its placePower.
Wherein, the ssrc value of " current talking ssrc_curr " can be divided into 3 intervals, and span is as table 1:
The synchronous information source ssrc interval table of table 1
" SuperAddresser " only has 1, be power user, can grab other PTT clients at any channelRight of speech, thus ensure can make a speech at any time, and can not be grabbed, be generally used for the manager of whole multichannel PTT system.
" Addresser " is domestic consumer, and the Main Basis that obtains right of speech is First come first served in default channel, ifIn this channel, current nobody speaks, and who first loquiturs so, and who just can obtain right of speech.
" Auditor " is audience, in which channel, be all can only listen not talkative.
The channel value of " the channel channel at place " can be divided into two kinds, and scope is in table 2:
Table 2 channel identication channel interval table
S300, described PTT client is during to described ptt server application right of speech, the resolver basis in ptt serverSynchronous information source mark and channel identication in the RTP voice packet extension header form of the PTT client receiving, to determine RTP languageSound packet broadcast is to common frequency channel or restricted channels.
After in step S200, the form to RTP voice packet is expanded, when PTT client is talked about to ptt server applicationLanguage temporary, the synchronous information source mark in the RTP voice packet extension header form that ptt server sends by PTT client andWhether channel identication decides the PTT client that sends RTP voice packet to have the right, and has the right to which channel broadcasting RTP voiceBag. Particularly, in the time that ptt server receives the RTP voice packet of PTT client, also need further to judge described RTP voiceAfter bag, whether there is speech data, do not have speech data to judge that this PTT client abandons right to speak, otherwise by current RTP languageThe value of synchronous information source mark of sound bag and the value of channel identication judges the competence of speech of described PTT client and to corresponding channelSpeech.
Should be understood that, the foregoing is only preferred embodiment of the present invention, be not sufficient to limit of the present inventionTechnical scheme, for those of ordinary skills, within the spirit and principles in the present invention, can add according to the above descriptionWith increase and decrease, replace, conversion or improve, and all these increases and decreases, replace, conversion or improve after technical scheme, all should belong to thisThe protection domain of invention claims.
Claims (6)
1. a multichannel PTT system, comprises multiple PTT clients and a ptt server, and described ptt server comprises sanctionCertainly device, is characterized in that,
Between described multiple PTT client and described ptt server, realize RTP voice by common frequency channel and/or restricted channelsBag transmission;
Described multiple PTT client is all arranged in common frequency channel, and selectable being arranged in restricted channels; PTT clientHold the multiple PTT clients in having the right to ptt server application to common frequency channel to send RTP voice packets; Be arranged on limited frequencyPTT client in road is had the right to ptt server application, and by described resolver ruling to the PTT visitor in corresponding restricted channelsFamily end sends RTP voice packet;
Described RTP voice packet transmits by RTP;
The gland form of described RTP voice packet comprises extension header form, and this extension header form comprises the synchronous letter of current talkingSource mark and channel identication, described resolver according to synchronous source identifier and channel identification to the PTT in corresponding restricted channelsClient sends RTP voice packet.
2. a kind of multichannel PTT system according to claim 1, is characterized in that, described common frequency channel is one, described inRestricted channels is at least one.
3. an implementation method for multichannel PTT system, for the voice between multiple PTT clients and a ptt serverTransmission, described ptt server comprises for determining that voice send the resolver of channel, it is characterized in that, comprises the steps:
A. multiple PTT clients are all arranged in common frequency channel, specific PTT client is arranged in restricted channels;
The gland form of the RTP voice packet B. PTT client being sent is expanded, and identifies synchronous in extension header formInformation source mark and channel identification, to determine authority and the channel type of PTT client;
C., when described PTT client is to described ptt server application right of speech, the resolver in ptt server is according to receivingThe RTP voice packet extension header form of PTT client in synchronous information source mark and channel identication, wide to determine RTP voice packetBroadcast common frequency channel or restricted channels.
4. the implementation method of a kind of multichannel PTT system according to claim 3, is characterized in that, in described step B, wrapsDraw together following steps:
Synchronous information source mark in extension header form in the RTP voice packet that described PTT client sends is for determining PTT clientThe right of speech rank of end, when the value of the synchronous information source mark of current RTP voice packet is 0x1, described PTT client has speech and robsAccount for power; The value of the synchronous information source mark of current RTP voice packet is in the time of interval 0x2 ~ 0xFFFFFF, and described PTT client does not havePower is seized in speech, can only in the time that PTT client in no third side is made a speech, apply for obtaining the floor; The synchronous letter of current RTP voice packetThe value of source mark is in the time of interval 0x1000000 ~ 0xFFFFFFFF, and described PTT client does not have right to speak.
5. the implementation method of a kind of multichannel PTT system according to claim 4, is characterized in that, in described step B, goes backComprise the steps:
Channel identication in extension header form in the RTP voice packet that described PTT client sends is used for definite PTT clientChannel, when the value of the channel identication of current RTP voice packet is 0x1, described PTT client is arranged on common frequency channel; Current RTP languageThe value of the channel identication of sound bag is in the time of interval 0x2 ~ 0xFFFFFFFF, and described PTT client is arranged on restricted channels.
6. the implementation method of a kind of multichannel PTT system according to claim 5, is characterized in that, described step C is concreteComprise step: in the time that ptt server receives the RTP voice packet of PTT client, judge after described RTP voice packet whether have languageSound data, does not have speech data to judge that this PTT client abandons right to speak, otherwise by the synchronous letter of current RTP voice packetThe value of source mark and the value of channel identication judge the competence of speech of described PTT client and make a speech to corresponding channel.
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| CN1917537A (en) * | 2006-09-22 | 2007-02-21 | 华为技术有限公司 | Method and system for realizing services through one key pushed |
| WO2008022317A2 (en) * | 2006-08-17 | 2008-02-21 | Redcom Laboratories, Inc. | Ptt/pts signaling in an internet protocol network |
| CN101137126A (en) * | 2007-02-07 | 2008-03-05 | 中兴通讯股份有限公司 | Group calling call mode automatically optimized method used for CDMA digital cluster system |
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| US7688764B2 (en) * | 2002-06-20 | 2010-03-30 | Motorola, Inc. | Method and apparatus for speaker arbitration in a multi-participant communication session |
| CA2740240A1 (en) * | 2008-10-20 | 2010-04-29 | Kodiak Networks, Inc. | Hybrid push-to-talk for mobile phone networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008022317A2 (en) * | 2006-08-17 | 2008-02-21 | Redcom Laboratories, Inc. | Ptt/pts signaling in an internet protocol network |
| CN1917537A (en) * | 2006-09-22 | 2007-02-21 | 华为技术有限公司 | Method and system for realizing services through one key pushed |
| CN101137126A (en) * | 2007-02-07 | 2008-03-05 | 中兴通讯股份有限公司 | Group calling call mode automatically optimized method used for CDMA digital cluster system |
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