CN101132624A - Method for implementing emergency business and system thereof - Google Patents
Method for implementing emergency business and system thereof Download PDFInfo
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- H04M3/42—Systems providing special services or facilities to subscribers
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/50—Connection management for emergency connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
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Abstract
This invention discloses a method for realizing urgent services including: a UE gets attribute information of an urgent service to interact with the network side in the light of the attribute and start up the urgent service to an urgent center by IMS network.
Description
Technical field
The present invention relates to the communications field, refer in particular to a kind of technology that realizes urgency traffic.
Background technology
In the social development process, no matter it is the communication epoch of traditional electrical phone network, still the present third generation or even the next-generation communication network epoch at a high speed, urgency traffic is all paid attention to by society, because urgency traffic can meet with under the dangerous emergency situation at individual/public health and safety, life/property, provide the business of urgent help.Therefore, the communication service of high priority will be provided for urgency traffic at communication network, according to calling subscriber's the positional information and the judgement of urgency traffic type are routed the call to optimal public safety joint point (PSAP, Public Safety Answering Point), route the call to optimal EC (ECC by this PSAP, Emergency Call Centre) handles, offer help for the seeking help person rapidly by this ECC again.
Continuous maturation along with group technology, develop based on Circuit-switched conventional telecommunication network towards broadband telecommunication net based on packet switching, using SIP then is one of current technology trends as the call control signalling of grouping telecommunications core network, in order to support the access of traditional circuit user in next generation network, ETSI (ETSI, European Telecommunications Standards Institute) has proposed the scheme of a kind of public switched telephone network (PSTN)/integrated services digital network simulation subsystem (PES).PES is the next generation (NGN of etsi standard tissue definition, Next Generation Network) subsystem of operation layer in the network architecture, this subsystem can be conventional telephone terminal emulation public switched telephone network (PSTN)/integrated services digital network (PSTN/ISDN) network in the NGN network.Like this, the conventional telephone terminal user of NGN network can inherit the business of PSTN/ISDN network, and can not perceive the change from PSTN/ISDN to the NGN network, is that user terminal (UE, User Equipment) provides emergency services in the NGN network.
The TS23.167 of 3GPP has defined the realization flow of urgency traffic in the IMS network.IMS (IPMultimedia Subsystem wherein, IP Multimedia System) is 3GPP (3rd Generation PartnershipProject, 3G (Third Generation) Moblie standardization body) in Release 5 versions, proposes, this IMS network is a multimedia control/calling controlling platform on packet domain, support conversation class and non-conversation class multimedia service, its core characteristics are to adopt SIP (Session Initiation Protocol, Session initiation Protocol) agreement can provide a general business platform for following multimedia application.
According to the definition of the urgency traffic of prior art, when UE initiated urgency traffic, realization flow was with reference to shown in Figure 1:
Step S1, UE detect the user and initiate emergency call request;
Step S2, this moment are being carried out other call business as UE, and described UE does not have enough resources and ability (ability that establishment is called out as UE or the restriction of bandwidth ability) to set up a calling (urgent call) again, UE finishes ongoing calling, releasing bearing resource;
Whether step S3, UE will carry registration according to the determined property of self, carry registration as needs, and UE initiates the carrying registration to IP-CAN (IP Access Network);
Step S4, when urgent resource bearing, in order to transmit the relevant signaling of IMS, requirement is reserved bearing resource at IP-CAN, and the reservation of this resource needs UE that the indication of a bearing resource reservation of initiating for urgency traffic is provided, and initiates bearing resource reservation to IP-CAN;
In this step, require IP-CAN to reserve bearing resource, UE need arrive IP-CAN and initiate bearing resource reservation, but content according to prior art, UE can not judge accurately whether IP-CAN requires UE to initiate need initiate emergency bearing resource when urgent call and reserve, so this just needs to carry out between UE and the IP-CAN to have consumed a large amount of signalings alternately;
Step S5, UE initiate the process that P-CSCF (Proxy-Call Session ControlFunction, agent call Session Control Unit) finds at IP-CAN, for a suitable P-CSCF, execution in step S6 are found in described urgent call in local network;
Wherein suitable P-CSCF is meant and that is to say the access point of relative calling subscriber's most convenient that the ECC that calls out according to this access point can make the calling subscriber obtain relief in the very first time in this step;
In the prior art, when initiating urgent call, UE all will carry out the P-CSCF discovery procedure at every turn, has so also influenced the efficient that continues of urgent call;
When S6, UE have the ability to be registered to the IMS network, have have user ID as UE this moment, if any SIM card, UE adopts IP address and the P-CSCF among the S5 among step S3, the S4 to initiate an IMS Emmergency log-on, comprise a urgent public user identity of IMS in this Emmergency log-on request, UE sets up the urgent call that flow process initiates to comprise a urgent call indication and urgent public user identity by the IMS session; Or,
When the UE ability is not registered to the IMS network, do not have the SIM card that has user ID as UE, then UE needn't initiate the IMS Emmergency log-on, directly initiates urgent call to P-CSCF, comprises a urgent call indication in this urgent call this moment.
In this scheme, when urgent call takes place, as long as UE has ability and is registered in the IMS network, just must carry out the IMS Emmergency log-on after, could initiate urgent call, so also reduced the efficient that continues of urgent call.And in the emergence call service of prior art, not with the positional information of UE as an important service attribute, so when urgent call, also there is pair UE position to do the judgement that makes mistake.
In addition, in the prior art, consider the efficient that continues that improves urgent call, industry considers that most UE has carried out common registration, when so if UE does not roam, the user can not initiate the IMS Emmergency log-on, has so just improved the efficient that continues of only calling out to a certain extent.
In sum, when carrying out urgency traffic in the prior art, although UE can omit the step to the IMS network registry when not roaming, but still need judge whether to carry the step of registration, emergency bearing resource reservation and P-CSCF gravity treatment, the efficient that continues of the urgency traffic of still failing farthest to improve.
Summary of the invention
The invention provides a kind of method and system that realize urgency traffic, in order to solve the not high technical problem of efficient that continues that has urgent call in the prior art.
The inventive method may further comprise the steps:
User terminal obtains the urgency traffic attribute information;
Described user terminal carries out alternately according to the urgency traffic attribute and the network side that obtain;
User terminal is initiated urgency traffic by the IMS network to urgent center.
In this method, described urgency traffic attribute comprises:
Described user terminal initiates whether to need to initiate the emergency bearing resource reservation attribute that emergency bearing resource is reserved before the urgency traffic; Or/and
Described user terminal initiates whether to need to carry out the P-CSCF gravity treatment attribute that P-CSCF finds gravity treatment before the urgency traffic; Or/and
The IMS Emmergency log-on attribute that whether needs to carry out the IMS Emmergency log-on before the described user terminal initiation urgency traffic; Or/and
Whether described user terminal needs to carry the positional information attribute of its position when initiating urgency traffic.
In this method, may further comprise the steps alternately of described user side and network side:
Emergency bearing resource reservation attribute is that the described user side of requirement initiates to need to carry out the emergency bearing reservation before the urgency traffic as described, described user terminal sends the bearing resource reservation indication according to this attribute to the IP Access Network, and described IP Access Network is made bearing resource reservation for this urgent call; Or/and
P-CSCF gravity treatment attribute is that the described user terminal of requirement initiates to need to carry out the P-CSCF gravity treatment before the urgency traffic as described, and described user terminal finds P-CSCF according to the discovery procedure of this attribute initiation P-CSCF gravity treatment at local network; Or/and
IMS Emmergency log-on attribute is that the described user terminal of requirement initiates to need to carry out the IMS Emmergency log-on before the urgency traffic as described, and described user terminal utilizes the IP address of described user terminal and P-CSCF to carry out the IMS Emmergency log-on according to this attribute.
In this method, when described user terminal passes through the IMS network initiated urgent business, as network side provide as described in the positional information attribute be need send positional information, the positional information of in the described urgency traffic message of initiating, carrying described user terminal when user terminal carries out urgency traffic as described in the requirement.
In this method, the urgency traffic attribute that user terminal obtains can be provided by network side, or is obtained by the default setting of the storage area of user terminal, or obtains according to the network default setting.
In this method, provide the mode of described urgency traffic attribute to be to described user terminal by network side:
Initiate Access Network when adhering to request at described user terminal, by network side this urgency traffic attribute is carried at and offers described user terminal in the request response; Or
Initiate P-CSCF when finding request at user terminal, by network side this urgency traffic attribute is carried at and offers described user terminal in the request response; Or
When user terminal is initiated the IMS Emmergency log-on, be carried at by this urgency traffic attribute of network side and offer described user terminal in the registration reply message; Or
When the user terminal initiation session, by network side this urgency traffic attribute is carried at and offers described user terminal in the conversational response message.
In this method, when described user terminal adheres to request or initiates P-CSCF discovery request or initiation IMS Emmergency log-on or initiation session at the initiation Access Network, send the request of obtaining described urgency traffic attribute to network side simultaneously.
In this method, network side provides described urgency traffic attribute may further comprise the steps in conversation procedure:
It is emergent operation request that described user terminal detects the conversation request that the user sends, and this emergent operation request is sent to network side; Perhaps, described user terminal is sent to network side with the conversation request that the user sends, and it is emergent operation request that network side detects this conversation request;
The network side transmission carries the response message of urgency traffic attribute to described user terminal.
In this method, described response message is that the described emergent operation request of indication does not meet the response of urgency traffic requirement, or to indicate described conversation request be the response of emergent operation request.
In this method, initiate Access Network at described user terminal and adhere to request or initiate P-CSCF when finding request, described urgency traffic attribute is that the IP Access Network by network side is carried at it and offers described user terminal in response message;
When described user terminal was initiated IMS Emmergency log-on or initiation session, described urgency traffic attribute was by the access control unit of network side or Session Control Unit it to be carried to offer described user terminal in the response message.
In this method, network side offers the mode of described user terminal for directly providing with described urgency traffic attribute; Or
Network association attributes and/or terminal association attributes are offered described user terminal, judge the indirect presentation mode of determining by described user terminal again.
In this method, described network association attributes comprises following at least a: access network information, access control unit information, Session Control Unit information; Described terminal association attributes comprises following at least a: terminal type, terminal capability, terminal roaming state.
In this method, described access network information comprises following at least a: access network type, access network capability, access network state; Described access control unit information comprises following at least a: access control unit capability, access control location mode; Described Session Control Unit information comprises following at least a: Session Control Unit ability, Session Control Unit state.
In this method, the mode that is obtained described urgency traffic attribute by the default setting of the storage area of user terminal is:
User terminal obtains the urgency traffic attribute from terminal equipment, or
User terminal obtains the urgency traffic attribute from Subscriber Identity Module.
In this method, described user terminal and described network side carry out when mutual, and user terminal is a block terminal as described, and described network side is a packet network, and then described user terminal directly inserts packet network to carry out alternately; User terminal is the traditional circuit terminal as described, and described network side is a packet network, and then described user terminal inserts packet network by IAD to carry out alternately.
In this method, described urgency traffic is emergence call service or urgent message service.
The present invention also provides a kind of system that realizes urgency traffic, comprises user terminal, network side and urgent center at least, wherein:
Described user terminal carries out information interaction according to its urgency traffic attribute that obtains and described network side, and the emergent operation request that the user is sent inserts described network side;
Described network side is used for the information according to the user terminal transmission, carries out alternately described urgency traffic being sent to described urgent center with described user terminal;
Described urgent center is used to receive the urgency traffic that described network side transmits, with described user terminal communication.
Described user terminal comprises customer service request receiving element, urgency traffic attribute acquiring unit, information interaction unit and the first service request confirmation unit at least, wherein:
Described customer service request receiving element is used to receive the Client-initiated service request;
The described first service request confirmation unit is used to confirm whether the service request that described customer service request receiving element receives is urgency traffic, and sends confirmation to described information interaction unit;
Described urgency traffic attribute acquiring unit is used for obtaining the urgency traffic attribute from network equipment or user terminal default setting;
Described information interaction unit is used for information and described network side that affirmation result and described urgency traffic attribute acquiring unit according to described service request confirmation unit obtain and carries out alternately.
Described user terminal also comprises:
The urgency traffic information receiving unit is used to receive the information that described network side issues, and determines described urgency traffic attribute according to the information that receives, and sends described information interaction unit to.
Described network side comprises that at least IP Access Network, network control unit and urgency traffic attribute provide the unit:
Described IP Access Network is used to described user terminal that IP is provided bearer path;
Described network control unit is used to finish registration and the session of described user terminal at network side;
Described urgency traffic attribute provides the unit, and being used for provides described urgency traffic attribute according to the control of described IP Access Network and/or described network control unit to described user terminal.
Described urgency traffic attribute provides the unit to be positioned at the IP Access Network, or the IAD control unit, or the agent call Session Control Unit, or the service call Session Control Unit, or the emergency call session control unit.
Described network side also comprises:
The second service request confirmation unit is used to confirm whether the service request of described user terminal institute access network side is urgency traffic, and will confirm that this business provides the unit for the information of urgency traffic offers described urgency traffic attribute.
Described user terminal is block terminal or traditional circuit terminal.
Described network side also comprises:
IAD is used for described traditional circuit terminal is inserted the IP Access Network by this access network.
Described urgent center is arranged in packet network or the legacy circuit network, directly or by gateway is connected to described network control unit indirectly.
Beneficial effect of the present invention is as follows:
Pass through the solution of the present invention, user terminal can be according to obtaining the urgency traffic attribute, determine under the urgency traffic situation, whether need to initiate emergency bearing resource and reserve, whether initiate the P-CSCF gravity treatment, whether initiate the IMS Emmergency log-on, emergency bearing resource is reserved in satisfying urgency traffic, the P-CSCF gravity treatment, saving signaling consumed when the IMS Emmergency log-on required, and improved the efficient of urgency traffic again.
Description of drawings
The schematic flow sheet that Fig. 1 carries out for the existing techniques in realizing urgency traffic;
Fig. 2 realizes the method flow diagram of urgency traffic for the present invention;
Fig. 3 realizes the system architecture diagram of urgency traffic for the present invention;
Fig. 4 is the structural representation of user terminal of the present invention.
Embodiment
The invention provides a kind of method and system that realize urgency traffic, its core is, when initiating urgency traffic, user terminal can be according to the urgency traffic attribute, determine under the urgency traffic situation, whether needing to initiate emergency bearing resource reserves, whether initiate the P-CSCF gravity treatment, whether initiate the IMS Emmergency log-on, whether need to provide positional information, so just make user terminal confirm above-mentioned information, saved the signaling consumption of initiating in the urgency traffic, improved the treatment effeciency of urgency traffic simultaneously according to the indication of network.
Adopt concrete execution mode that method of the present invention is carried out specific description below:
With reference to shown in Figure 2, be the basic flow sheet of the inventive method, as seen from Figure 2, this method may further comprise the steps:
In this step 201, described urgency traffic attribute comprise in the following attribute one or several or all:
Described user terminal initiates whether to need to initiate the emergency bearing resource reservation attribute that emergency bearing resource is reserved before the urgency traffic; The P-CSCF gravity treatment attribute that whether needs to carry out the P-CSCF gravity treatment before the described user terminal initiation urgency traffic; The IMS Emmergency log-on attribute that whether needs the IMS Emmergency log-on before the described user terminal initiation urgency traffic; When carrying out urgency traffic, described user terminal whether needs to carry the positional information attribute of its position.
In this step, the urgency traffic attribute of described user terminal storage can be in the urgency traffic process (in conversation procedure) by and the network information mutual, described user terminal obtains from network side; Also can be before the user initiates urgency traffic with the reciprocal process of network in (as Access Network adhere to or when P-CSCF discovery procedure or IMS Emmergency log-on), described user terminal obtains from network side; Described terminal also can by on the storage area that is arranged on the described user terminal or the default setting of equipment obtain.
In the present invention, network side adopts following form that described urgency traffic attribute is offered user terminal:
A, urgency traffic attribute explicit (direct mode) is sent to described user terminal, directly indication is under the urgency traffic situation, whether needing to initiate emergency bearing resource reserves, whether initiate the P-CSCF gravity treatment, whether initiate the IMS Emmergency log-on, whether carry position information of user's terminal when initiating the IMS urgency traffic.
B, urgency traffic attribute implicit expression (indirect mode) is sent to described user terminal, promptly network side with the network association attributes and or the terminal association attributes offer described user terminal, by described user terminal described urgency traffic attribute is determined in its judgement.The network association attributes comprises following at least a: access network information, interface control unit information, Session Control Unit information; Access network information comprises: the access network type is (as GPRS network, wlan network, DSL network etc.), access network capability (as access network whether to supporting emergency bearing resource reservation etc.), whether the access network state (as access network roaming has taken place, whether the access network operating state is normal etc.), the access control unit information comprises: access control unit capability (whether supporting urgency traffic as the access control unit), the access control location mode (is positioned at roaming territory or home domain as the access control unit, access control cell operation state), Session Control Unit information comprises: user contracting data (as user's 'no disturbance ' service of having contracted), Session Control Unit ability (whether supporting urgency traffic) as Session Control Unit, Session Control Unit state (as the Session Control Unit state); The terminal association attributes is including, but not limited to: terminal type (fixing, as to move), terminal capability (as whether supporting to initiate Emmergency log-on), terminal roaming state (roaming or not); User terminal can obtain corresponding urgency traffic attribute according to the urgency traffic determined property of this implicit expression, being positioned at the roaming territory as user terminal just needs to initiate the IMS Emmergency log-on, and the access network type is that GPRS reserves and the P-CSCF gravity treatment with regard to needing to initiate emergency bearing resource.
If network side sends to described user terminal with the partial information in the urgency traffic attribute, wherein network side does not have the service attribute of generation, user terminal can obtain the urgency traffic attribute from the storage area on the user terminal, perhaps according to using the urgency traffic attribute of giving tacit consent to the agreement of network side or the configuration of terminal.
The urgency traffic attribute that user terminal obtains can be provided (the acquisition form of urgency traffic attribute can be divided into explicit or implicit expression) by network side, or is obtained by the default setting of the storage area of user terminal, or obtains according to the network default setting.Wherein said default setting can be arranged with network side, also can only be the default configuration of user terminal.When described user terminal when network side obtains the urgency traffic attribute, described urgency traffic attribute can also can offer user terminal by the IMS network by access network.
Below adopting concrete example how user terminal is obtained the urgency traffic attribute information describes:
Mode one, described urgency traffic attribute are to initiate to offer when Access Network adheres to described user terminal by network side at described user terminal;
Network side can provide the urgency traffic attribute to user terminal at common attaching process or the attaching process that is used for urgency traffic;
For example: user terminal UE sends by GPRS network and is attached to PS (Packet Switched, packet switching) during the request in territory, GPRS network generates the access response message according to the request of UE, simultaneously the urgency traffic attribute is carried in the response message and offers UE by the IP Access Network, this urgency traffic attribute can be the state of network side according to the network planning or UE, information such as position, or the positional information at urgent center is determined, in the present embodiment, determined urgency traffic attribute may comprise: UE need initiate the emergency bearing resource reservation when urgency traffic; UE need carry out the P-CSCF gravity treatment; UE needs the IMS Emmergency log-on; UE need provide positional information when sending urgency traffic.Described UE receives the access response message, and preserves this urgency traffic attribute information, realizes the urgency traffic attribute indication of network side to UE.In view of UE has preserved described urgency traffic attribute information, when UE detects urgency traffic, UE just can recognize the requirement of network according to this information, and carries out information interaction according to this information and network side, promptly UE initiate that emergency bearing resource is reserved, P-CSCF gravity treatment and IMS Emmergency log-on.
In addition, in the present embodiment, when described user terminal adheres to request at the initiation access network, carry information from the urgency traffic attribute to network side that obtain simultaneously, network side obtains information according to this described urgency traffic attribute is sent to described user terminal.
In the present embodiment, UE also can by move or fixedly access way be linked into packet-based core networks, when inserting packet-based core networks with fixed form, the IP Access Network can given UE distributing IP address, perhaps during the PPPOE authentication, notice UE related emergency service attribute; In addition, the urgency traffic attribute not only can offer UE with above-mentioned direct mode and preserve, also can provide with indirect mode, just judge to obtain corresponding urgency traffic attribute by UE according to corresponding information, providing the current network access style as network side is GPRS network, and UE determines when the urgent call according to this access network type, needing to initiate emergency bearing resource reserves, need to carry out the P-CSCF gravity treatment, need the IMS Emmergency log-on, positional information need be provided; Network side is when providing the urgency traffic attribute, may owing to network attribute (as the access network type, the ability of access network) decision can only provide partial information to UE, for the information that network does not provide, UE can adopt according to the default property of network planning setting and determine the urgency traffic attribute.
Mode two, network side offer described user terminal with the urgency traffic attribute when user terminal is initiated the P-CSCF discovery;
Network side can provide the urgency traffic attribute to user terminal in common P-CSCF discovery procedure or the P-CSCF discovery procedure that is used for urgency traffic;
For example: user terminal UE is by being linked into network side, with the packet network is example, and network side passes through dhcp process after finishing the access authentication of UE, by the address notification UE of IP Access Network, in the P-CSCF address that provides, carry the urgency traffic attribute information simultaneously with P-CSCF in the network; As: do not need to initiate emergency bearing resource when the urgency traffic and reserve, need to carry out the P-CSCF gravity treatment, need the IMS Emmergency log-on, do not need to provide positional information; UE receives the P-CSCF address information that network side provides, and preserves urgency traffic attribute information wherein, realizes the urgency traffic attribute indication of network side to UE.In view of UE has preserved described urgency traffic attribute information, when UE detects urgency traffic, UE just can recognize the requirement of network according to this information, and carry out information interaction according to this information and network side, be that UE does not initiate the emergency bearing resource reservation, and directly initiate P-CSCF gravity treatment and IMS Emmergency log-on.
Certainly in the present embodiment, network side also can be in other P-CSCF discovery procedure, and the PDP mode as under the GPRS offers UE with the urgency traffic attribute.
In addition, in the present embodiment, described user terminal carries information from the urgency traffic attribute to network side that obtain simultaneously when initiating P-CSCF discovery request, and network side obtains information according to this described urgency traffic attribute is sent to described user terminal.
In the manner two, the urgency traffic attribute not only can directly offer described UE fully in the P-CSCF discovery procedure; Also can adopt indirect mode to offer described UE, judge the corresponding urgency traffic attribute of acquisition by UE according to corresponding information, provide current P-CSCF whether to be positioned at the information of roaming or home network as network side, UE can judge the corresponding urgency traffic attribute of acquisition according to this information, in the present embodiment, be positioned at the roaming territory as P-CSCF, then do not need to initiate the P-CSCF gravity treatment.In addition, in the manner, network side may can only provide partial information to UE owing to the network attribute decision when the urgency traffic attribute is provided, for the information that network does not provide, UE can adopt the default property that is provided with to determine the urgency traffic attribute according to the network planning.
When mode three, network side are initiated the IMS registration at user terminal, the urgency traffic attribute is offered described user terminal by network side;
Network side can provide the urgency traffic attribute to user terminal in common IMS registration process or the IMS registration process that is used for urgency traffic;
Be specially: find when UE finishes adhering to P-CSCF of access network, address according to the network side access control unit that obtains in the P-CSCF discovery procedure, initiate the IMS registration by this access control unit, this registration message is forwarded to the Session Control Unit of network side and carries out registration control; According to the network planning, described Session Control Unit returns registration reply message, and carries the urgency traffic attribute information in this registration reply message, returns to described UE by described access control unit; In the present embodiment, described Session Control Unit also can only return registration reply message to described access control unit, in this registration reply message, insert the urgency traffic attribute by described access control unit, return to described UE, the urgency traffic attribute that described UE preserves wherein (as: does not need to initiate the emergency bearing resource reservation when urgency traffic, do not need to carry out the P-CSCF gravity treatment, need the IMS Emmergency log-on).In view of UE has preserved described urgency traffic attribute information, when UE detects urgency traffic, UE just can recognize the requirement of network according to this information, and carry out information interaction according to this information and network side, be that UE does not initiate emergency bearing resource reservation and P-CSCF gravity treatment, but at first initiate the IMS Emmergency log-on.
In addition, in the present embodiment, described user terminal carries information from the urgency traffic attribute to network side that obtain simultaneously when initiating the request of IMS Emmergency log-on, and network side obtains information according to this described urgency traffic attribute is sent to described user terminal.
In the manner three, the same with above-mentioned dual mode, the urgency traffic attribute not only can directly offer described UE fully when registration reply message sends; Also can adopt indirect mode to offer described UE, judge that according to corresponding information obtaining corresponding urgency traffic attribute also preserves by UE, provide current UE whether to be positioned at the information of roaming or home network as network side, UE can judge the corresponding urgency traffic attribute of acquisition according to this information, in the present embodiment, be positioned at the roaming territory as UE, then need to initiate the IMS Emmergency log-on.In addition, in the manner, network side may can only provide partial information to UE owing to the network attribute decision when the urgency traffic attribute is provided, for the information that network does not provide, UE can adopt the default property that is provided with to determine the urgency traffic attribute according to the network planning.
Mode four, network side offer described user terminal with the urgency traffic attribute and preserve when the user terminal initiation session;
Aforesaid way below is described in two kinds of situation, promptly determines that at UE the Client-initiated service request is that emergent operation request and UE do not determine the situation that this service request is an emergent operation request.
UE determines the situation that the Client-initiated service request is an emergent operation request, be specially: because the relevant urgency traffic attribute information that described UE does not have storage networking to provide, be after UE finishes the common registration of core net, receive service request from user, it is emergency call request that UE detects the call request that the user sends according to the call identification (as customer call number 119) of this service request; Described UE does not initiate emergency bearing resource and reserves, P-CSCF gravity treatment and IMS Emmergency log-on, this this emergency call request is directly sent to network side, network side judges that this emergency call request runs counter to the urgency traffic requirement, may think that as network side this calling needs to initiate the P-CSCF gravity treatment, therefore refuses this urgent call; Network side send carry urgency traffic attribute (do not reserve as not needing to initiate emergency bearing resource when the urgency traffic, need to carry out the P-CSCF gravity treatment, need the IMS Emmergency log-on, positional information need be provided) response message to described user terminal.When UE receives this response message, preserve this urgency traffic attribute, and carry out information interaction according to this information and network side, promptly initiate P-CSCF gravity treatment and IMS Emmergency log-on.
In the present embodiment, this urgency traffic attribute information can be inserted in the response message according to access control unit or the Session Control Unit of the network planning by network side.
When UE does not determine the situation that the Client-initiated service request is an emergent operation request, be specially: after UE receives the Client-initiated emergent operation request, it is urgent call that UE does not detect this calling, and is sent to the access control unit of described network side according to the emergency call request that the user is sent in ordinary call; Described access control unit determines that according to the call identification of this calling this calling is urgent call, and this calling of transmission indication is the response message of urgent call, and (as: not needing to initiate emergency bearing resource when urgency traffic reserves also to carry described urgency traffic attribute information in this response message, need to carry out the P-CSCF gravity treatment, need the IMS Emmergency log-on).Like this, when UE receives this response message, carry out information interaction, can initiate P-CSCF gravity treatment and IMS Emmergency log-on with network side.
In this mode, this urgency traffic attribute can provide with direct mode, also can adopt indirect mode to offer described UE, judge that according to corresponding information obtaining corresponding urgency traffic attribute also preserves by UE, as provide current UE whether to be positioned at the information of roaming or home network, UE can judge the corresponding urgency traffic attribute of acquisition according to this information, and being positioned at the roaming territory as UE just needs to initiate the IMS Emmergency log-on.In addition, in the manner, network side is when providing the urgency traffic attribute, may be owing to network attribute (can be and network side agreement attribute, also can be the default configuration of user terminal) determine and can only provide partial information to UE, for the information that network does not provide, UE can adopt the default property that is provided with to determine the urgency traffic attribute according to the network planning.
Mode five, described urgency traffic attribute can be for being arranged on the default setting on the storage area on the user terminal, also can be for being arranged on the default setting on the equipment;
When the urgency traffic attribute was obtained by the default setting of the storage area of user terminal, user terminal can obtain the urgency traffic attribute from the terminal equipment of user terminal, also can obtain the urgency traffic attribute from the Subscriber Identity Module (SIM) of user terminal;
Subscriber Identity Module is positioned on the Universal Integrated Circuit Card, and it stores user totem information, can insert from terminal or take out, as the SIM card in the mobile phone.
If described user terminal has been installed the SIM card with urgency traffic attribute information, when described user terminal is emergent operation request in definite Client-initiated service request, this user terminal promptly can carry out information interaction according to urgency traffic attribute and the network side on the SIM card of installing, described user terminal routes to described urgent center with urgency traffic, in time helps the user who wants help;
Do not have the SIM card of urgency traffic attribute information if described user terminal has to install, just can initiate urgency traffic according to the mode of prior art.
In the manner, urgency traffic attribute information in the SIM card also may be that network side offers user terminal under above-mentioned four kinds of situations, described user terminal is stored in it on SIM card or the terminal, default setting for the relevant urgency traffic attribute that is provided with in the SIM card also can adopt above-mentioned four kinds of modes to upgrade in addition, after its renewal, UE can adopt the urgency traffic attribute and the network interaction of renewal.
Above-mentioned five kinds of modes have been described several situations how user terminal obtains the urgency traffic attribute, when detecting urgency traffic, just can realize urgency traffic according to the urgency traffic attribute and the network interaction that obtain.
Carrying out mutual process according to urgency traffic attribute that obtains and network side is:
As network side provide as described in emergency bearing resource to reserve attribute be need carry out emergency bearing when user side carries out urgency traffic as described in the requirement to reserve, described user terminal sends the bearing resource reservation indication according to this attribute to the IP Access Network, and described IP Access Network is made bearing resource reservation for this urgent call; Or/and
As network side provide as described in P-CSCF gravity treatment attribute be need carry out the P-CSCF gravity treatment when user terminal carries out urgency traffic as described in the requirement, described user terminal is initiated the discovery procedure of P-CSCF gravity treatment according to this attribute, finds P-CSCF at local network; Or/and
As network side provide as described in IMS Emmergency log-on attribute be need carry out the IMS Emmergency log-on when user terminal carries out urgency traffic as described in the requirement, described user terminal utilizes the IP address of UE and P-CSCF to carry out the IMS Emmergency log-on according to this attribute.
In this step, UE is a block terminal as described, and described network side is a packet network, and then described UE directly inserts packet network to carry out alternately; UE is the traditional circuit terminal as described, and described network side is a packet network, and then described UE inserts packet network by IAD to carry out alternately.
In this step, whether be that urgency traffic is approved really to be made by user terminal for the Client-initiated service request, also can make the back informing user terminal by network side;
May further comprise the steps by of the affirmation of described user terminal this urgency traffic:
A, user initiate service request;
B, described user terminal receive this request, and according to the service identification in the described service request, as called number; Determine that this service request is an emergent operation request.
Described user terminal determines that this service request is emergent operation request or receives when the request of network notice current business is emergent operation request, if described user terminal (for example carries out another business, call business), described user terminal determines whether the needs releasing bearing resource according to self-ability.The self-ability of wherein said user terminal is meant the ability etc. that user terminal is created the ability of session and had occupied bandwidth, user terminal can be created two sessions simultaneously and have enough bandwidth as described, and then this user terminal just need not to carry out resource release; When user terminal did not have the ability of creating two sessions simultaneously as described, then this user terminal just needed releasing bearing resource, the priority treatment urgency traffic.Also need this moment described user terminal to discharge back initiation carrying registration in carrying according to the demand of network side.
May further comprise the steps by of the affirmation of described network side this urgency traffic:
A1, user initiate emergent operation request;
B1, user terminal receive this request, and initiate at network side according to general service;
C1, network side determine that according to the service identification that receives service request described service request is an emergent operation request;
The indication of D1, network side formation information should business be that the information of urgency traffic is notified described user terminal.
What proposed in the present embodiment carries out the mode that urgency traffic is confirmed by network side, can guarantee service request to be made and confirm that still the service request that can in time send the user is handled timely under the situation that mistake or user terminal do not confirm service request at user terminal.
In this step, user terminal sends emergent operation request to the IMS network, and in emergent operation request, carry the urgency traffic indication, when if this user terminal has been installed SIM card, described emergent operation request also can be carried the urgent public identifier of user terminal, the IMS network sends above-mentioned emergent operation request to urgent center, and as network side provide as described in the positional information attribute be requirement UE need send positional information when carrying out urgency traffic the time, the positional information that in described urgency traffic, also should carry described user terminal.UE carries the positional information of UE and can directly transmit in sip message in urgent call, also can be by carrying an address, can obtain the positional information of UE by visiting this address.
If need not send positional information when indicating UE to carry out urgency traffic in the urgency traffic attribute that network side provides, then UE can carry or not carry positional information in urgency traffic according to the default property of the network planning.
In the present embodiment, urgent center (PSAP/ECC) is to be determined by network side according to the urgency traffic type information of the positional information of described UE and request, or also can be determined by network side according to the user ID of user terminal and the urgency traffic type information of request.
In the solution of the present invention, in order to offer help to emergent operation request person more timely, also comprise: described urgent center is by the step of the described user terminal of network side callback.
In the present invention, the urgency traffic that is proposed can be emergence call service or urgent message service.
By method of the present invention, user terminal can be according to the urgency traffic attribute, determine under the urgency traffic situation, whether need to initiate emergency bearing resource and reserve, whether initiate the P-CSCF gravity treatment, whether initiate the IMS Emmergency log-on, emergency bearing resource is reserved in satisfying urgency traffic, the P-CSCF gravity treatment, saving signaling consumed when the IMS Emmergency log-on required, and improved the efficient of urgent call again.
The present invention simultaneously provides a kind of system that realizes urgency traffic again, as shown in Figure 3, comprises user terminal, network side and urgent center at least, wherein:
Described user terminal carries out information interaction according to its urgency traffic attribute that obtains and described network side, and the emergent operation request that the user is sent inserts described network side; Described network side is used for the information according to the user terminal transmission, carries out alternately described urgency traffic being sent to described urgent center with described user terminal; Described urgent center is used to receive the urgency traffic that described network side transmits, with described user terminal communication.
With reference to figure 4, described user terminal comprises customer service request receiving element, urgency traffic attribute acquiring unit, information interaction unit and the first service request confirmation unit at least, wherein:
Described customer service request receiving element is used to receive the Client-initiated service request;
The described first service request confirmation unit is used to confirm whether the service request that described customer service request receiving element receives is urgency traffic, and sends confirmation to described information interaction unit;
Described urgency traffic attribute acquiring unit is used for obtaining the urgency traffic attribute from network equipment or user terminal default setting;
Described information interaction unit is used for information and described network side that affirmation result and described urgency traffic attribute acquiring unit according to described service request confirmation unit obtain and carries out alternately.
Network side is when providing the urgency traffic attribute information, network side may adopt indirect mode to provide, therefore described user terminal also comprises: the urgency traffic information receiving unit, be used to receive the information that described network side issues, and determine described urgency traffic attribute according to the information that receives, and send described information interaction unit to, when taking place, calls urgency traffic.
Still with reference to shown in Figure 3, described network side comprises that at least IP Access Network, network control unit and urgency traffic attribute provide the unit:
Described IP Access Network is used to described user terminal that IP is provided bearer path; The terminal of this IP Access Network insert comprise realize user terminal adhere to IP address assignment, and bearing resource controlled function; Among the present invention, IP-CAN can be GRPS, WLAN, DSL, LAN, networks such as PacketCable;
Described network control unit is used to finish registration and the session of described user terminal at network side;
Described urgency traffic attribute provides the unit, and being used for provides described urgency traffic attribute according to the control of described IP Access Network and/or described network control unit to described user terminal.In the present embodiment, this urgency traffic attribute provides the unit can be arranged on the IP Access Network, or IAD control unit, or agent call Session Control Unit, or service call Session Control Unit, or the emergency call session control unit, realize that network side provides the purpose of urgency traffic attribute to user terminal.
Described network control unit comprises: the access control unit, be used for providing its access address to described IP Access Network, and under described user terminal requests, finish the access of described user terminal, and the information that receives is passed to Session Control Unit; In the present embodiment, this access control unit can be as P-CSCF and the AGCF in existing IMS and the PES standard, the interface of user access control unit and user terminal can be the E2 interface, when user terminal inserts by Session Initiation Protocol, its interface protocol is SIP, when user terminal is a traditional circuit terminal when being linked into the access control unit by IAD, the interface protocol of IAD and access control unit can be SIP, H248 or other medium control protocol;
Session Control Unit is used to receive the information of described access control unit forwards, makes the user finish the registration and the session of network side.In the present embodiment, described Session Control Unit can be as the S-CSCF in the existing IMS standard, E-CSCF, I-CSCF, P-CSCF; Can be between it and the access control unit as the E3 interface, this interface can be internal interface or the external interface that adopts Session Initiation Protocol.
In native system, to the erroneous judgement of emergent operation request or fail to judge, described network side also comprises for fear of user terminal:
The second service request confirmation unit is used to confirm whether the service request of described user terminal institute access network side is urgency traffic, and will confirm that this business provides the unit for the information of urgency traffic offers described urgency traffic attribute.
In native system, described user terminal is block terminal or traditional circuit terminal.Described urgent center (PSAP/ECC) is arranged in packet network or the legacy circuit network, directly or by gateway is connected to described network control unit indirectly.During as indirect connection, can connect, as the media gateway controlling unit etc. by other node.
When user terminal was the traditional circuit terminal, described network side also comprised: the IAD that is used for described traditional circuit terminal is inserted by this access network the IP Access Network.
In the IMS network, described network control unit can be IAD control unit (AGCF), agent call Session Control Unit (P-CSCF), service call Session Control Unit (S-CSCF), emergency call session control unit (E-CSCF);
Described urgency traffic attribute provides the unit can be positioned at the IP Access Network, also can be arranged in the AGCF (AGCF) of IMS network, agent call Session Control Unit (P-CSCF), service call Session Control Unit (S-CSCF), emergency call session control unit (E-CSCF).
With the user terminal is that block terminal is that example describes the flow process that realizes urgency traffic:
The customer service request receiving element of block terminal is after receiving the Client-initiated service request, confirm by the first service request confirmation unit whether this service request is emergent operation request according to the network planning, when if the first service request confirmation unit confirms that this service request is emergent operation request, the information interaction unit carries out information interaction according to urgency traffic attribute and the network side that urgency traffic attribute acquiring unit obtains, comprising whether reserving bearing resource, whether P-CSCF gravity treatment, whether IMS registers, the network control unit of network side routes to urgent center with this urgency traffic, realizes user's urgency traffic.
In addition, in the present embodiment, whether be that emergent operation request is approved really to be confirmed by the second service request confirmation unit of network side to service request according to the network planning.
In the present embodiment, when network side provides the urgency traffic attribute to user terminal, the information interaction unit that can be by user terminal and IP Access Network, the network control unit of network side are mutual, provide the unit that this information is offered described user by the urgency traffic attribute of network side.How the related network side offers the urgency traffic attribute description of user terminal can be with reference to the related description of method.
By system of the present invention, user terminal can reduce mutual with network side, saving signaling consumption, the efficient of the urgency traffic of Ti Gaoing again.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (25)
1. a method that realizes urgency traffic is characterized in that, may further comprise the steps:
User terminal obtains the urgency traffic attribute information;
Described user terminal carries out alternately according to the urgency traffic attribute and the network side that obtain;
User terminal is initiated urgency traffic by the IMS network to urgent center.
2. method according to claim 1 is characterized in that, described urgency traffic attribute comprises:
Described user terminal initiates whether to need to initiate the emergency bearing resource reservation attribute that emergency bearing resource is reserved before the urgency traffic; Or/and
Described user terminal initiates whether to need to carry out the P-CSCF gravity treatment attribute that P-CSCF finds gravity treatment before the urgency traffic; Or/and
The IMS Emmergency log-on attribute that whether needs to carry out the IMS Emmergency log-on before the described user terminal initiation urgency traffic; Or/and
Whether described user terminal needs to carry the positional information attribute of its position when initiating urgency traffic.
3. method according to claim 2 is characterized in that, may further comprise the steps alternately of described user side and network side:
Emergency bearing resource reservation attribute is that the described user side of requirement initiates to need to carry out the emergency bearing reservation before the urgency traffic as described, described user terminal sends the bearing resource reservation indication according to this attribute to the IP Access Network, and described IP Access Network is made bearing resource reservation for this urgent call; Or/and
P-CSCF gravity treatment attribute is that the described user terminal of requirement initiates to need to carry out the P-CSCF gravity treatment before the urgency traffic as described, and described user terminal finds P-CSCF according to the discovery procedure of this attribute initiation P-CSCF gravity treatment at local network; Or/and
IMS Emmergency log-on attribute is that the described user terminal of requirement initiates to need to carry out the IMS Emmergency log-on before the urgency traffic as described, and described user terminal utilizes the IP address of described user terminal and P-CSCF to carry out the IMS Emmergency log-on according to this attribute.
4. method according to claim 2, it is characterized in that, when described user terminal passes through the IMS network initiated urgent business, as network side provide as described in the positional information attribute be need send positional information, the positional information of in the described urgency traffic message of initiating, carrying described user terminal when user terminal carries out urgency traffic as described in the requirement.
5. method according to claim 1 is characterized in that, the urgency traffic attribute that user terminal obtains can be provided by network side, or is obtained by the default setting of the storage area of user terminal, or obtains according to the network default setting.
6. method according to claim 5 is characterized in that, provides the mode of described urgency traffic attribute to be by network side to described user terminal:
Initiate Access Network when adhering to request at described user terminal, by network side this urgency traffic attribute is carried at and offers described user terminal in the request response; Or
Initiate P-CSCF when finding request at user terminal, by network side this urgency traffic attribute is carried at and offers described user terminal in the request response; Or
When user terminal is initiated the IMS Emmergency log-on, be carried at by this urgency traffic attribute of network side and offer described user terminal in the registration reply message; Or
When the user terminal initiation session, by network side this urgency traffic attribute is carried at and offers described user terminal in the conversational response message.
7. method according to claim 6, it is characterized in that, when described user terminal adheres to request or initiates P-CSCF discovery request or initiation IMS Emmergency log-on or initiation session at the initiation Access Network, send the request of obtaining described urgency traffic attribute to network side simultaneously.
8. method according to claim 6 is characterized in that, network side provides described urgency traffic attribute may further comprise the steps in conversation procedure:
It is emergent operation request that described user terminal detects the conversation request that the user sends, and this emergent operation request is sent to network side; Perhaps, described user terminal is sent to network side with the conversation request that the user sends, and it is emergent operation request that network side detects this conversation request;
The network side transmission carries the response message of urgency traffic attribute to described user terminal.
9. method according to claim 8 is characterized in that, described response message is that the described emergent operation request of indication does not meet the response of urgency traffic requirement, or to indicate described conversation request be the response of emergent operation request.
10. method according to claim 6 is characterized in that:
Initiate Access Network at described user terminal and adhere to request or initiate P-CSCF when finding request, described urgency traffic attribute is that the IP Access Network by network side is carried at it and offers described user terminal in response message;
When described user terminal was initiated IMS Emmergency log-on or initiation session, described urgency traffic attribute was by the access control unit of network side or Session Control Unit it to be carried to offer described user terminal in the response message.
11. method according to claim 5 is characterized in that, network side offers the mode of described user terminal for directly providing with described urgency traffic attribute; Or
Network association attributes and/or terminal association attributes are offered described user terminal, judge the indirect presentation mode of determining by described user terminal again.
12. method according to claim 11 is characterized in that,
Described network association attributes comprises following at least a: access network information, access control unit information, Session Control Unit information;
Described terminal association attributes comprises following at least a: terminal type, terminal capability, terminal roaming state.
13. method according to claim 12 is characterized in that,
Described access network information comprises following at least a: access network type, access network capability, access network state;
Described access control unit information comprises following at least a: access control unit capability, access control location mode;
Described Session Control Unit information comprises following at least a: Session Control Unit ability, Session Control Unit state.
14. method according to claim 5 is characterized in that, the mode that is obtained described urgency traffic attribute by the default setting of the storage area of user terminal is:
User terminal obtains the urgency traffic attribute from terminal equipment, or
User terminal obtains the urgency traffic attribute from Subscriber Identity Module.
15. method according to claim 1 is characterized in that, described user terminal and described network side carry out when mutual, and user terminal is a block terminal as described, and described network side is a packet network, and then described user terminal directly inserts packet network to carry out alternately; User terminal is the traditional circuit terminal as described, and described network side is a packet network, and then described user terminal inserts packet network by IAD to carry out alternately.
16., it is characterized in that described urgency traffic is emergence call service or urgent message service according to the described method of above-mentioned any claim.
17. a system that realizes urgency traffic is characterized in that, comprises user terminal, network side and urgent center at least, wherein:
Described user terminal carries out information interaction according to its urgency traffic attribute that obtains and described network side, and the emergent operation request that the user is sent inserts described network side;
Described network side is used for the information according to the user terminal transmission, carries out alternately described urgency traffic being sent to described urgent center with described user terminal;
Described urgent center is used to receive the urgency traffic that described network side transmits, with described user terminal communication.
18. system according to claim 17 is characterized in that, described user terminal comprises customer service request receiving element, urgency traffic attribute acquiring unit, information interaction unit and the first service request confirmation unit at least, wherein:
Described customer service request receiving element is used to receive the Client-initiated service request;
The described first service request confirmation unit is used to confirm whether the service request that described customer service request receiving element receives is urgency traffic, and sends confirmation to described information interaction unit;
Described urgency traffic attribute acquiring unit is used for obtaining the urgency traffic attribute from network equipment or user terminal default setting;
Described information interaction unit is used for information and described network side that affirmation result and described urgency traffic attribute acquiring unit according to described service request confirmation unit obtain and carries out alternately.
19. system according to claim 18 is characterized in that, described user terminal also comprises:
The urgency traffic information receiving unit is used to receive the information that described network side issues, and determines described urgency traffic attribute according to the information that receives, and sends described information interaction unit to.
20. system according to claim 17 is characterized in that, described network side comprises that at least IP Access Network, network control unit and urgency traffic attribute provide the unit:
Described IP Access Network is used to described user terminal that IP is provided bearer path;
Described network control unit is used to finish registration and the session of described user terminal at network side;
Described urgency traffic attribute provides the unit, and being used for provides described urgency traffic attribute according to the control of described IP Access Network and/or described network control unit to described user terminal.
21. system according to claim 20 is characterized in that, described urgency traffic attribute provides the unit to be positioned at the IP Access Network, or IAD control unit, or the agent call Session Control Unit, or the service call Session Control Unit, or the emergency call session control unit.
22. system according to claim 20 is characterized in that, described network side also comprises:
The second service request confirmation unit is used to confirm whether the service request of described user terminal institute access network side is urgency traffic, and will confirm that this business provides the unit for the information of urgency traffic offers described urgency traffic attribute.
23., it is characterized in that described user terminal is block terminal or traditional circuit terminal according to the described system of above-mentioned any claim.
24. system according to claim 23 is characterized in that, described network side also comprises:
IAD is used for described traditional circuit terminal is inserted the IP Access Network by this access network.
25. system according to claim 17 is characterized in that, described urgent center is arranged in packet network or the legacy circuit network, directly or by gateway is connected to described network control unit indirectly.
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| CN103037320A (en) * | 2011-09-30 | 2013-04-10 | 中兴通讯股份有限公司 | Non-voice emergency service capability informing method and system |
| WO2013079025A1 (en) * | 2011-11-30 | 2013-06-06 | 中兴通讯股份有限公司 | Non-voice emergency service media selection method and system, network side, and terminal |
| WO2016183775A1 (en) * | 2015-05-18 | 2016-11-24 | 华为技术有限公司 | Emergency call method, apparatus and device |
| CN106464653A (en) * | 2015-05-18 | 2017-02-22 | 华为技术有限公司 | Emergency call method, apparatus and device |
| WO2017113077A1 (en) * | 2015-12-28 | 2017-07-06 | 华为技术有限公司 | Emergency service uplink transmission method, base station, user equipment and system |
| CN107231621A (en) * | 2016-03-24 | 2017-10-03 | 中国移动通信集团公司 | A kind of information processing method and mobile management entity, terminal |
| CN110933590A (en) * | 2018-08-30 | 2020-03-27 | 中国电信股份有限公司 | Information reporting method, device, terminal and computer readable storage medium |
| CN113079187A (en) * | 2020-01-03 | 2021-07-06 | 成都鼎桥通信技术有限公司 | Method and system for supporting emergency video service in B-Trunc protocol |
| CN113163371A (en) * | 2021-03-18 | 2021-07-23 | 维沃移动通信有限公司 | Calling method and device and electronic equipment |
| WO2024082880A1 (en) * | 2022-10-21 | 2024-04-25 | 华为技术有限公司 | Communication method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100563373C (en) | 2009-11-25 |
| WO2008025231A1 (en) | 2008-03-06 |
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