CN104486293A - Media negotiation method and system based on network and terminal capability under wireless VoIP (Voice Over Internet Protocol) environment - Google Patents
Media negotiation method and system based on network and terminal capability under wireless VoIP (Voice Over Internet Protocol) environment Download PDFInfo
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Abstract
The invention relates to the technical field of wireless communication. The invention discloses a media negotiation method based on network and terminal capability under a wireless VoIP environment. The method comprises the following concrete steps that step 1, a business controller acquires the media capability of a terminal, a terminal accessing manner and the current network transmission capability; step 2, a calling terminal issues a request, the business controller judges whether the calling terminal and a called terminal have a media capability intersection or not, and when a media code intersection exists and is suitable for the current network transmission capability, one or more media codes are selected to build a session between the calling terminal and the called terminal; otherwise, step 3 is carried out; step 3, the network media capability is increased in an SDP (Session Description Protocol) message, the SDP of the calling terminal and the SDP of the called terminal are redirected to a media server to carry out conversion of encoding manners, the encoding conversion process of the media server is controlled through the business controller, and after the session is built, RTP (Real Time Protocol) media channels are respectively built between the calling terminal and the media server as well as between the called terminal and the media server. The communication between the two wireless terminals without the media capability intersection is realized.
Description
Technical field
The present invention relates to wireless communication technology field, the media consulation method of Network Based and terminal capability and system under particularly relating to a kind of Wireless VoIP environment.
Background technology
In the VoIP system of the main flow such as soft switch, SIP and IMS, traditional media capability negotiation mechanism, normally according to the common factor of the media capability between terminal and terminal, if there is common factor, then selects one or more to set up session in common factor, if no, then both sides successfully cannot set up session.Also there is shortcoming with not enough in this traditional media capability negotiation mechanism, shortcoming is mainly as follows:
(1) wireless terminal is by restrictions such as miniaturization, battery capacities, is difficult to dispose complete media capability; In addition, the media capability being applied to the terminal institute subordinate of different occasion is also had nothing in common with each other, and therefore probably cannot negotiate media capability between terminal when media negotiation and occur simultaneously.
(2) in the wireless context, network capacity is also large unlike cable network, and terminal may exist plurality of access modes usually.Specifically, the transmittability of wireless network usually the most directly reaction be exactly communication bandwidth, the terminal wireless link feature of often planting corresponding to access way is different in addition, and direct effect is exactly that communication bandwidth corresponding to often kind of access way is had nothing in common with each other.And the communication bandwidth ability of traditional media consulation method under not considering wireless environment corresponding to different access way, cause the result of consulting out probably to be not suitable for the situations such as current network transmission resource or terminal access mode (demand of the coded system of such as consulting out to communication bandwidth is greater than actual bandwidth value), cause the service quality of business to can not get ensureing.
Summary of the invention
What exist for traditional media machinery of consultation in prior art causes the result cannot setting up session and media negotiation to be not suitable for the situations such as the access way of current network transmission resource or terminal because negotiating common factor, the service quality of business is caused to can not get the problem ensured, the media consulation method of Network Based and terminal capability under the invention provides a kind of Wireless VoIP environment, the media negotiation system of Network Based and terminal capability under the invention also discloses a kind of Wireless VoIP environment.
The media consulation method of Network Based and terminal capability under the invention discloses a kind of Wireless VoIP environment, it specifically comprises the following steps: that step one, service controller obtain the media capability of terminal, terminal access mode and current network transmittability; The request of making a call of step 2, calling terminal, according to the media capability of calling and called terminal and access way, service controller judges whether calling and called terminal has media capability to occur simultaneously, be and have the media coding being suitable for current network transmittability to occur simultaneously, then selecting wherein one or more media codings to set up the session between calling and called; Otherwise enter step 3; Step 3, in SDP message, increase the media capability adapting to current network transmittability, and the SDP of calling and called terminal is redirected to the conversion that media server carries out coded system, and the transcoding procedure of media server is controlled by service controller, after session establishment completes, calling and called terminal sets up RTP media channel with media server respectively.
Further, above-mentioned steps one is specially: terminal is when registering, and access way and media capability are supplied to HSS server, and service controller is to HSS server lookup terminal access mode, media capability and network media ability.
Further, above-mentioned steps two also comprises when calling and called terminal has one or more media codings to occur simultaneously, and when having the media coding being suitable for current network transmittability to occur simultaneously, revises terminal media ability in sdp.
Further, the process revising terminal media ability is in sdp specially: the SDP information in service controller amendment calling terminal INVITE, retain the media coding adapting to network capacity, port numbers corresponding for the media coding being not suitable with network capacity is set to 0.
Further, the detailed process increasing the media capability adapting to current network transmittability is in sdp: increase network media ability in the SDP message that service controller carries in caller INVITE, and increase network media ability in the SDP message of called reply.
Under the invention also discloses a kind of Wireless VoIP environment, the media negotiation system of Network Based and terminal capability, is characterized in that specifically comprising two SIP service terminals, service controller, media server and HSS; Two SIP service terminals are respectively calling terminal and terminal called; Described calling terminal is used for initiation and makes a call; Described terminal called is used for call accepted request;
Described service controller is used for judging whether calling and called terminal has media capability to occur simultaneously according to the media capability of calling and called terminal and access way, and judges whether the media coding common factor being suitable for current network transmittability; Select wherein one or more media codings to set up the session between calling and called; Otherwise increase the media capability adapting to current network transmittability in sdp, and the SDP of calling and called terminal is redirected to the conversion that media server carries out coded system; After session establishment completes, calling and called terminal sets up RTP media channel with media server respectively;
Described media server is used for setting up RTP media channel under the control of service controller and between calling and called terminal;
Described HSS is used for providing terminal access mode, media capability and network media ability to service controller.
By adopting above technical scheme, beneficial effect of the present invention is: the present invention is by providing the media negotiation control method of a kind of ability of UNE in the wireless context and terminal capability, when calling and called media capability is incompatible, both sides still can communicate; And avoiding media coding mode that calling and called terminal negotiates voluntarily to depositing in absence of such a match between the practical communication bandwidth ability corresponding to the demand of communications bandwidth resources and terminal access mode, occurring the situation of communication quality degradation.
Accompanying drawing explanation
Fig. 1 is the procurement process of terminal media ability and access way.
Fig. 2 is the processing procedure in calling and called terminal media capabilities match situation.
Fig. 3 is the processing procedure of calling and called terminal media ability not under match condition.
Fig. 4 is media negotiation system configuration that is Network Based under Wireless VoIP environment and terminal capability.
Embodiment
Below in conjunction with Figure of description, describe the specific embodiment of the present invention in detail.
The media consulation method of Network Based and terminal capability under the invention discloses a kind of Wireless VoIP environment, it specifically comprises the following steps: that step one, service controller obtain the media capability of terminal, terminal access mode and current network transmittability; The request of making a call of step 2, calling terminal, according to the media capability of calling and called terminal and access way, service controller judges whether calling and called terminal exists media capability and occur simultaneously.Specifically, after the service controller media capability various according to calling and called terminal forms public media capability, again according to the access way of calling and called terminal, the basis of public medium ability is got rid of to communications bandwidth resources beyond communication bandwidth ability corresponding to calling and called access way and the media capability beyond current network transmission bandwidth, see that whether also there is media capability occurs simultaneously (for speech media ability, the VoIP speech stream of pcm encoder mode to the demand of communication bandwidth at about 80kbps, G.729 the VoIP speech stream of coded system to the demand of communication bandwidth at about 16kbps, therefore communication bandwidth is at least greater than 80kbps and carries PCM Speech Communication effect and just can meet the demands, same communication bandwidth is at least greater than 16kbps and carries G.729 Speech Communication effect and just can meet the demands).If exist, then wherein one or more media codings are selected to set up the session between calling and called; Otherwise enter step 3; Step 3, at SDP(Session Description Protocol, Session Description Protocol) increase the media capability adapting to current network transmittability in message, and the SDP of calling and called terminal is redirected to the conversion that media server carries out coded system, and the transcoding procedure of media server is controlled by service controller, after session establishment completes, calling and called terminal sets up RTP(Real-time Transport Protocol respectively with media server, RTP, is called for short RTP) media channel.The media capability of terminal is got by arranging service controller, the access way of terminal and the transmittability of current network, and judged by service controller, between calling and called terminal, there is media capability occur simultaneously and be suitable for current network transmittability, it is then direct that according to existing way selection, wherein one or more set up the session between calling and called, when not having media capability common factor or its media capability coding common factor not to be suitable for current network transmittability between calling and called terminal, the SDP of calling and called terminal is redirected to media server and carries out coded format conversion, by SDP(Session Description Protocol, Session Description Protocol, be called for short SDP) be redirected to media server and carry out coded format conversion, and media server is controlled, after session establishment completes, calling and called terminal sets up RTP (Real-time Transport Protocol respectively with media server, RTP, be called for short RTP) media channel, Internet Transmission is realized by RTP Media Stream between calling and called terminal.Method of the present invention makes when calling and called media capability is incompatible, and both sides still can communicate; And avoid when the selection of terminal media coded system and current access link state are not mated, occur the situation of communication quality degradation.
Fig. 1 is the procurement process of terminal media ability and access way.
At terminal and media server when registering, by register or give out information respectively by Information issued such as terminal media ability, terminal access mode and network media abilities to service controller.
Further, above-mentioned steps one is specially: terminal is when registering, access way and media capability are supplied to HSS(Home Subscriber Server home subscriber server, be called for short HSS) server, service controller is to HSS server lookup terminal access mode, media capability and network media ability.Network media ability refers to the media capability being applicable to current network transmittability.
Fig. 2 is the processing procedure in calling and called terminal media capabilities match situation.
Terminal is when making a call, service controller judges according to the access way of calling and called terminal and media capability, occur simultaneously if calling and called terminal has media to encode, and have the media coding being suitable for current network transmittability to occur simultaneously, then revise terminal media ability in sdp.As shown in Figure 3, concrete steps are as follows for the flow chart of service controller amendment SDP terminal media ability:
Step S201, service controller receives the SDP message of carrying in calling terminal INVITE;
Step S202, obtains access way and the media capability of calling and called terminal from HSS;
Step S203, if calling and called terminal media ability has media encode and have the media coding being suitable for current network transmittability in occuring simultaneously, service controller then revises the SDP information in calling terminal INVITE, retain the media coding adapting to network capacity, port numbers corresponding for the media coding being not suitable with network capacity is set to 0;
Step S204, modification process terminates.
Further, above-mentioned steps two also comprises when calling and called terminal has one or more media codings to occur simultaneously, and when having the media coding being suitable for current network transmittability to occur simultaneously, revises terminal media ability in sdp.
Further, the above-mentioned process revising terminal media ability is in sdp specially: the SDP information in service controller amendment calling terminal INVITE, retain the media coding adapting to network capacity, port numbers corresponding for the media coding being not suitable with network capacity is set to 0.
Fig. 3 is the processing procedure of calling and called terminal media ability not under match condition.
Step S301, service controller receives the SDP message of carrying in calling terminal INVITE;
Step S302, obtains access way and the media capability of calling and called terminal from HSS;
Step S303, if calling and called terminal media ability is not suitable for current network transmittability media coding in occuring simultaneously occurs simultaneously, increases network media ability (not increasing the ability repeated with terminal capability) in the SDP that service controller then carries at INVITE;
Step S304, service controller increases network media ability (not increasing the ability repeated with terminal capability) in the SDP of 200 OK of called reply;
Step S305, the SDP of calling and called is redirected to media server and carries out coded system conversion by service controller, and controls media server;
Step S306, after session establishment completes, calling and called terminal sets up RTP media channel with media server respectively.
Further, the above-mentioned detailed process increasing the media capability adapting to current network transmittability is in sdp: increase network media ability in the SDP message that service controller carries in caller INVITE, and increase network media ability in the SDP message of called reply.
The media negotiation system of Network Based and terminal capability under the invention also discloses a kind of Wireless VoIP environment, as shown in Figure 4, it specifically comprises two SIP service terminals, service controller, media server and HSS; Two SIP service terminals are respectively calling terminal and terminal called; Described calling terminal is used for initiation and makes a call; Described terminal called is used for call accepted request;
Described service controller is used for judging whether calling and called terminal has media capability to occur simultaneously according to the media capability of calling and called terminal and access way, and judges whether the media coding common factor being suitable for current network transmittability; Select wherein one or more media codings to set up the session between calling and called; Otherwise increase the media capability adapting to current network transmittability in sdp, and the SDP of calling and called terminal is redirected to the conversion that media server carries out coded system; After session establishment completes, calling and called terminal sets up RTP media channel with media server respectively;
Described media server is used for setting up RTP media channel under the control of service controller and between calling and called terminal;
Described HSS is used for providing terminal access mode, media capability and network media ability to service controller.
By said system, achieve when calling and called media capability is incompatible, both sides still can communicate; And avoid when the selection of terminal media coded system and current access link state are not mated, occur the situation of communication quality degradation.
Coefficient given in the above embodiments and parameter; be available to those skilled in the art to realize or use invention; invention does not limit only gets aforementioned disclosed numerical value; when not departing from the thought of invention; those skilled in the art can make various modifications or adjustment to above-described embodiment; thus the protection range invented not limit by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (6)
1. the media consulation method of Network Based and terminal capability under Wireless VoIP environment, it specifically comprises the following steps: that step one, service controller obtain the media capability of terminal, terminal access mode and current network transmittability; The request of making a call of step 2, calling terminal, according to the media capability of calling and called terminal and access way, service controller judges whether calling and called terminal has media capability to occur simultaneously, be and have the media coding being suitable for current network transmittability to occur simultaneously, then selecting wherein one or more media codings to set up the session between calling and called; Otherwise enter step 3; Step 3, in SDP message, increase the media capability adapting to current network transmittability, and the SDP of calling and called terminal is redirected to the conversion that media server carries out coded system, and the transcoding procedure of media server is controlled by service controller, after session establishment completes, calling and called terminal sets up RTP media channel with media server respectively.
2. the media consulation method of Network Based under Wireless VoIP environment as claimed in claim 1 and terminal capability, it is characterized in that above-mentioned steps one is specially: terminal is when registering, access way and media capability are supplied to HSS server, and service controller is to HSS server lookup terminal access mode, media capability and network media ability.
3. the media consulation method of Network Based under Wireless VoIP environment as claimed in claim 1 and terminal capability, it is characterized in that above-mentioned steps two also comprises when calling and called terminal has one or more media codings to occur simultaneously, and when having the media coding being suitable for current network transmittability to occur simultaneously, revise terminal media ability in sdp.
4. the media consulation method of Network Based under Wireless VoIP environment as claimed in claim 3 and terminal capability, it is characterized in that the process revising terminal media ability is in sdp specially: the SDP information in service controller amendment calling terminal INVITE, retain the media coding adapting to network capacity, port numbers corresponding for the media coding being not suitable with network capacity is set to 0.
5. the media consulation method of Network Based and terminal capability under the Wireless VoIP environment as described in claim 1 or 4, it is characterized in that the detailed process increasing the media capability adapting to current network transmittability is in sdp: increase network media ability in the SDP message that service controller carries in caller INVITE, and increase network media ability in the SDP message of called reply.
6. the media negotiation system of Network Based and terminal capability under Wireless VoIP environment, is characterized in that specifically comprising two SIP service terminals, service controller, media server and HSS; Two SIP service terminals are respectively calling terminal and terminal called; Described calling terminal is used for initiation and makes a call; Described terminal called is used for call accepted request;
Described service controller is used for judging whether calling and called terminal has media capability to occur simultaneously according to the media capability of calling and called terminal and access way, and judges whether the media coding common factor being suitable for current network transmittability; Select wherein one or more media codings to set up the session between calling and called; Otherwise increase the media capability adapting to current network transmittability in sdp, and the SDP of calling and called terminal is redirected to the conversion that media server carries out coded system; After session establishment completes, calling and called terminal sets up RTP media channel with media server respectively;
Described media server is used for setting up RTP media channel under the control of service controller and between calling and called terminal;
Described HSS is used for providing terminal access mode, media capability and network media ability to service controller.
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