CN103024685A - Multi-channel PTT (push-to-talk) system and implementation method thereof - Google Patents
Multi-channel PTT (push-to-talk) system and implementation method thereof Download PDFInfo
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- CN103024685A CN103024685A CN2012105223736A CN201210522373A CN103024685A CN 103024685 A CN103024685 A CN 103024685A CN 2012105223736 A CN2012105223736 A CN 2012105223736A CN 201210522373 A CN201210522373 A CN 201210522373A CN 103024685 A CN103024685 A CN 103024685A
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Abstract
A multi-channel PTT system and an implementation method of the multi-channel PTT system comprise a plurality of PTT clients and a PTT server. The PTT server comprises a resolver, and RTP (real time protocol) voice packets are transmitted through common channels and/or limited channels between the plurality of PTT clients and the PTT server. The plurality of PTT clients are all arranged in the common channels and can choose to be arranged in the limited channels; the PTT clients have the right to apply to the PTT server for sending RTP voice packets to a plurality of PTT clients in the common channels, and the PTT clients arranged in the limited channels have the right to apply to the PTT server for sending RTP voice packets to the PTT clients in the corresponding limited channels after being resolved by the resolver. The multi-channel PTT system provides optional voice transmission in different channels, and enables the group calling between the PTT clients in specific channels to be shielded from the common channels, thereby improving the confidentiality of the PTT system.
Description
Technical field
The present invention relates to be specially adapted for business or the facility that button is namely said or button is namely exhaled in the cordless communication network, relate in particular 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 wireless telephonic intercommunication mode, as long as can converse by next button, be called again " PTT ", be similar to traditional intercom on the function.Prior art PTT system comprises a plurality of PTT clients (PTT Client) and a PTT server (PTT Server), as shown in Figure 1, system comprises a plurality of PTT clients 10 '---PTT Client 1 ~ PTT Client n and a PTT Server 20 ', PTT Server comprises resolver 21 ', the PTT client can be arranged on the portable terminal of user's use, the user uses it to carry out the PTT conversation, just can be to PTT server application right of speech behind the press-to-talk, the RTP voice packet is sent to PTT Server, if apply for successfully, the voice packet of PTT client is sent to same broadcast address by ptt server, so that PTT Client receives, PTT Server monitors the RTP voice packet on the same broadcast address.In actual use, may have a plurality of PTT Client to want simultaneously to speak, at this moment, the resolver 21 ' among the PTT Server can determine the right of speech of PTT Client.Compare common making a phone call, the PTT largest benefit is to have the function of grouping busy, namely people people that other people have this equipment that speaks can both hear.The staff of some company, mechanism (such as hotel, airport) or tissue (such as construction team), they are general to work in a smaller scope simultaneously together, and need continually with scope in other people speak simultaneously, if use so PTT to bring great convenience to them, other people can both hear because as long as he talk facing to PTT at any time, and needn't inform by telephone singly.Yet prior art only can be broadcast to all PTT clients with the RTP voice packet by ptt server, needs PTT client on the address and the RTP voice packet selectively can't be broadcast to part, can't realize control 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 is for solving prior art defective and deficiency, proposes a kind of support multichannel PTT system, can realize that the RTP voice packet selectively is 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 a plurality of PTT clients and a ptt server, and described ptt server comprises resolver, realizes the RTP transmission of voice packets by common frequency channel and/or restricted channels between described a plurality of PTT clients and the described ptt server; Described a plurality of PTT client all is arranged in the common frequency channel, and selectable being arranged in the restricted channels; A plurality of PTT clients in the PTT client is had the right to from the ptt server application to common frequency channel send the RTP voice packet; The PTT client that is arranged in the restricted channels is had the right to the ptt server application, and sends the RTP voice packet by described resolver ruling to the PTT client in the corresponding restricted channels.
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 the extension header form, and this extension header form comprises synchronous information source sign and the channel identication of current talking.Described resolver is according to source identifier and channel identification send the RTP voice packet to the PTT client in the corresponding restricted channels synchronously.
The present invention also provides the implementation method of a kind of multichannel PTT system, is used for the voice transfer between a plurality of PTT clients and the ptt server, comprises in the described ptt server for the resolver of determining voice transmission channel, comprises the steps:
A. a plurality of PTT clients all are arranged in the common frequency channel, specific PTT client is arranged in the restricted channels;
The gland form of the RTP voice packet that B. the PTT client is sent is expanded, and identifies synchronous information source sign and channel identification in the extension header form, to determine authority and the channel type of PTT client;
When C. described PTT client is to described ptt server application right of speech, resolver in the ptt server is according to synchronous information source sign and channel identication in the RTP voice packet extension header form of the PTT client that receives, to determine that the RTP voice packet is broadcast to common frequency channel or restricted channels.
Comprise the steps: among the described step B
Synchronous information source sign in the extension header form in the RTP voice packet that described PTT client sends is used for determining the right of speech rank of PTT client, and when the value of the synchronous information source sign of current RTP voice packet was 0x1, described PTT client had speech and seizes power; When the value of the synchronous information source sign of current RTP voice packet was in interval 0x2 ~ 0xFFFFFF, described PTT client not speech was seized power, can only apply for obtaining the floor when PTT client in no third side is made a speech; When the value of the synchronous information source sign of current RTP voice packet was in interval 0x1000000 ~ 0xFFFFFFFF, described PTT client did not have right to speak.
Also comprise the steps: among the described step B
Channel identication in the extension header form in the RTP voice packet that described PTT client sends is used for determining the channel of PTT client, and when the value of the channel identication of current RTP voice packet was 0x1, described PTT client was arranged on common frequency channel; When the value of the channel identication of current RTP voice packet was in interval 0x2 ~ 0xFFFFFFFF, described PTT client was arranged on restricted channels.
Described step C specifically comprises step: when ptt server receives the RTP voice packet of PTT client, judge behind the described RTP voice packet whether speech data is arranged, do not have speech data to judge that then this PTT client abandons right to speak, otherwise the value of the value of the synchronous information source sign by the current RTP voice packet and channel identication is judged the competence of speech of described PTT client and to corresponding channel speech.
Compared with prior art, the present invention has adopted multichannel PTT system, with a plurality of PTT clients with ptt server is arranged on common frequency channel and restricted channels is carried out voice data transmission, be fixed the expansion of a form by the RTP voice packet that the PTT client is sent, synchronous information source sign and the channel identication of current talking are set in expansion, so that ptt server can go out the competence of speech of PTT client and the RTP voice packet of the PTT client transmission that will have a say sends to other PTT clients with the forms of broadcasting according to the synchronous information source sign of current talking and channel identication ruling, improvement for the arbitration functions of resolver, so that the PTT system can have different channel to carry out optionally voice transfer, make in specific channel and to group busy the relative common frequency channel shielding of function between the PTT client, strengthened the confidentiality of PTT system.And, the RTP voice packet is fixed an implementation of form expansion fairly simple, be easy to realize, only can make ptt server make correct ruling by synchronous information source sign and channel identication, be convenient to design and the popularization of system.
Description of 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 a plurality of channel PTT system.
Fig. 3 is the process chart that the present invention supports the implementation method of a plurality of channel PTT system.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, the present invention supports a plurality of channel PTT system to comprise a plurality of PTT clients 10---PTT Client 1 ~ PTT Client n and a ptt server 20, described ptt server 20 comprises resolver 21, realizes the RTP transmission of voice packets by common frequency channel and/or restricted channels between described a plurality of PTT clients 10 and the described ptt server 20; The channel that the transmission of carrying out speech data between PTT client and the ptt server is adopted adopts two types channel: common frequency channel and restricted channels, purpose is that the PTT client of same level is classified, make between the PTT client of authority and can be broadcast in the specific restricted channels by ptt server, make the PTT client that is set in the restricted channels just can receive corresponding RTP voice packet.Because common frequency channel can be used by all PTT clients, therefore, common frequency channel only arranges one, and described restricted channels is at least one, also can set according to the needs that use for a plurality of, divide setting according to the level of PTT client.And the described RTP voice packet of PTT client and the transmission of ptt server spare transmits by RTP.
Described a plurality of PTT client 10 all is arranged in the common frequency channel, and selectable being arranged in the restricted channels; PTT client 10 has the right to send the RTP voice packet to ptt server 20 applications to a plurality of PTT clients in the common frequency channel; The PTT client that is arranged in the restricted channels is had the right to the ptt server application, and sends the RTP voice packet by described resolver ruling to the PTT client in the corresponding restricted channels.The gland form of described RTP voice packet comprises the extension header form, and this extension header form comprises synchronous information source sign and the channel identication of current talking.Described resolver is according to source identifier and channel identification send the RTP voice packet to the PTT client in the corresponding restricted channels synchronously.
Shown in Figure 3 is the flow chart of a kind of multichannel PTT of the present invention network system realization, and the structure of PTT system is with reference to figure 2, and its implementation step is as follows:
S100 all is arranged on a plurality of PTT clients 10 in the common frequency channel, and specific PTT client is arranged in the restricted channels; For common frequency channel, arbitrary PTT client of a plurality of PTT clients all can be carried out the RTP transmission of voice packets at this channel, namely in common frequency channel, all have right of speech, PTT client in the multichannel PTT of the present invention system all in common frequency channel, all have the right to ptt server 20 application rights of speech by all PTT clients.And that restricted channels can have is a plurality of, but has one at least, setting up restricted channels is that the specific PTT client of part is listed in wherein, when the right of speech of the PTT client that is positioned at restricted channels on this channel of ptt server application, the PTT client that only is in the restricted channels just can be heard relevant voice.Certainly, for which PTT client be arranged in the restricted channels, can be set up on their own by the user.
S200, the gland form of the RTP voice packet that PTT client 10 is sent is expanded, and identifies synchronous information source sign and channel identification in the extension header form, to determine authority and the channel type of PTT client; Carry out voice packet in the voice transfer between PTT client 10 and the ptt server 20 by the RTP(RTP) realize, be with, this voice packet is called the RTP voice packet, ptt server is after receiving the RTP voice packet of PTT client, need to determine which PTT client can obtain right of speech by resolver, the RTP voice packet that then these PTT clients is sent sends on the corresponding channel by the forms of broadcasting.For make ptt server can identify the PTT client with and the channel at place (common frequency channel or be which restricted channels), and make correct ruling, need to expand the RTP voice packet, RTP gland form is general to adopt following form:
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P|X| CC |M| PT | sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| timestamp |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| synchronization source (SSRC) identifier |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
| contributing source (CSRC) identifiers |
| .... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Wherein the 3rd " X " is the extension flag position, if this flag bit is set to 1, represents that then RTP gland form back follows stature expansion, and this flag bit is set as 1, and its RTP extension header form is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| defined by profile | length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| header extension |
| .... |
If the extended bit position X in the RTP gland form is set to 1, after then an adjustable length expansion was added to the RTP gland, the head expansion comprised the length field of 16 bits, and the number of 32 bits does not comprise 4 byte expansion heads in the indication extension item, therefore, 0 is effective value.Only allowed stature expansion after the RTP gland, front 16 bits of extension are in order to identify indications or parameter, the form of this 16 bit does not illustrate in RTP, but by concrete upper-layer protocol definition, because the PTT system need not use this 16 bit, therefore this 16 bit all need to be set to 0, its RTP extension header form is as follows:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0| 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 ", length (2) sign increases by two signs, i.e. " ssrc_curr of current talking " and " the channel channel at place ", the ssrc_curr of current talking is 4 bytes, represent the synchronous information source sign in the RTP voice packet gland form extended format, the channel channel at place is 4 bytes, represents channel identication.
The form expansion that the gland form of RTP voice packet is done is the sign that increases synchronous information source ssrc and channel Channel, and " the current talking ssrc_curr " of each PTT client all is unique, ptt server identifies to distinguish the PTT client with this synchronous information source, and decides the PTT client can obtain right of speech on which channel in conjunction with the channel at its place.
Wherein, the ssrc value of " current talking ssrc_curr " can be divided into 3 intervals, span such as table 1:
Table 1 is information source ssrc interval table synchronously
" Super Addresser " only has 1, is the power user, can grab at any channel the right of speech of other PTT clients, thereby guarantees can to make a speech at any time, and can not be grabbed, and generally is 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, if current nobody speaks in this channel, who loquiturs first so, and who just can obtain right of speech.
" Auditor " is the audience, in which channel all be can only listen not talkative.
The channel value of " the channel channel at place " can be divided into two kinds, and scope sees Table 2:
Table 2 channel identication channel interval table
S300, described PTT client is during to described ptt server application right of speech, resolver in the ptt server is according to synchronous information source sign and channel identication in the RTP voice packet extension header form of the PTT client that receives, to determine that the RTP voice packet is broadcast to common frequency channel or restricted channels.
After the form expansion to the RTP voice packet among the step S200, when PTT client during to ptt server application right of speech, whether the synchronous information source sign in the RTP voice packet extension header form that ptt server namely sends by the PTT client and channel identication decide the PTT client of transmission RTP voice packet to have the right, and have the right to which channel broadcasting RTP voice packet.Particularly, when ptt server receives the RTP voice packet of PTT client, also need further judge behind the described RTP voice packet whether speech data is arranged, do not have speech data to judge that then this PTT client abandons right to speak, otherwise the value of the value of the synchronous information source sign by the current RTP voice packet and channel identication is judged the competence of speech of described PTT client and to corresponding channel speech.
Should be understood that; the above only is preferred embodiment of the present invention; be not sufficient to limit technical scheme of the present invention; for those of ordinary skills; within the spirit and principles in the present invention; can be increased and decreased according to the above description, replacement, conversion or improvement, and all these increases and decreases, replacement, conversion or improve after technical scheme, all should belong to the protection range of claims of the present invention.
Claims (8)
1. a multichannel PTT system comprises a plurality of PTT clients and a ptt server, and described ptt server comprises resolver, it is characterized in that,
Realize the RTP transmission of voice packets by common frequency channel and/or restricted channels between described a plurality of PTT client and the described ptt server;
Described a plurality of PTT client all is arranged in the common frequency channel, and selectable being arranged in the restricted channels; A plurality of PTT clients in the PTT client is had the right to from the ptt server application to common frequency channel send the RTP voice packet; The PTT client that is arranged in the restricted channels is had the right to the ptt server application, and sends the RTP voice packet by described resolver ruling to the PTT client in the corresponding restricted channels.
2. a kind of multichannel PTT according to claim 1 system is characterized in that, described common frequency channel is one, and described restricted channels is at least one.
3. a kind of multichannel PTT according to claim 1 system is characterized in that, described RTP voice packet transmits by RTP.
4. a kind of multichannel PTT according to claim 3 system is characterized in that, the gland form of described RTP voice packet comprises the extension header form, and this extension header form comprises synchronous information source sign and the channel identication of current talking; Described resolver is according to source identifier and channel identification send the RTP voice packet to the PTT client in the corresponding restricted channels synchronously.
5. the implementation method of a multichannel PTT system is used for the voice transfer between a plurality of PTT clients and the ptt server, comprises in the described ptt server for the resolver of determining voice transmission channel, it is characterized in that, comprises the steps:
A. a plurality of PTT clients all are arranged in the common frequency channel, specific PTT client is arranged in the restricted channels;
The gland form of the RTP voice packet that B. the PTT client is sent is expanded, and identifies synchronous information source sign and channel identification in the extension header form, to determine authority and the channel type of PTT client;
When C. described PTT client is to described ptt server application right of speech, resolver in the ptt server is according to synchronous information source sign and channel identication in the RTP voice packet extension header form of the PTT client that receives, to determine that the RTP voice packet is broadcast to common frequency channel or restricted channels.
6. the implementation method of a kind of multichannel PTT according to claim 5 system is characterized in that, comprises the steps: among the described step B
Synchronous information source sign in the extension header form in the RTP voice packet that described PTT client sends is used for determining the right of speech rank of PTT client, and when the value of the synchronous information source sign of current RTP voice packet was 0x1, described PTT client had speech and seizes power; When the value of the synchronous information source sign of current RTP voice packet was in interval 0x2 ~ 0xFFFFFF, described PTT client not speech was seized power, can only apply for obtaining the floor when PTT client in no third side is made a speech; When the value of the synchronous information source sign of current RTP voice packet was in interval 0x1000000 ~ 0xFFFFFFFF, described PTT client did not have right to speak.
7. the implementation method of a kind of multichannel PTT according to claim 6 system is characterized in that, also comprises the steps: among the described step B
Channel identication in the extension header form in the RTP voice packet that described PTT client sends is used for determining the channel of PTT client, and when the value of the channel identication of current RTP voice packet was 0x1, described PTT client was arranged on common frequency channel; When the value of the channel identication of current RTP voice packet was in interval 0x2 ~ 0xFFFFFFFF, described PTT client was arranged on restricted channels.
8. the implementation method of a kind of multichannel PTT according to claim 7 system, it is characterized in that, described step C specifically comprises step: when ptt server receives the RTP voice packet of PTT client, judge behind the described RTP voice packet whether speech data is arranged, do not have speech data to judge that then this PTT client abandons right to speak, otherwise the value of the value of the synchronous information source sign by the current RTP voice packet and channel identication is judged the competence of speech of described PTT client and to corresponding channel speech.
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| TWI623215B (en) * | 2016-01-05 | 2018-05-01 | 麥司奇科技股份有限公司 | A communicating method for a cloud server |
| CN108353255A (en) * | 2015-10-30 | 2018-07-31 | 三星电子株式会社 | Pass through the PTT communication means and device of multiple PTT channels |
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