CN101577888B - Method and base station for switching IP multimedia subsystem emergency calls - Google Patents
Method and base station for switching IP multimedia subsystem emergency calls Download PDFInfo
- Publication number
- CN101577888B CN101577888B CN2008101753510A CN200810175351A CN101577888B CN 101577888 B CN101577888 B CN 101577888B CN 2008101753510 A CN2008101753510 A CN 2008101753510A CN 200810175351 A CN200810175351 A CN 200810175351A CN 101577888 B CN101577888 B CN 101577888B
- Authority
- CN
- China
- Prior art keywords
- urgent call
- target
- bearing identification
- call
- subscriber equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a method and a base station for switching IP multimedia subsystem emergency calls. In the method, when a source base station determines to initiate a switch, the source base station determines that user equipment currently carries out an emergency call and then initiates the switch to a target cell according to an emergency-call bearing identifier carried in bearing information of a media bearer of the emergency call. According to a technical proposal provided by the invention, the normal proceeding of the emergency call can be guaranteed so as to provide continuous emergency call service for users and improve user experience.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of changing method and base station of IP Multimedia System urgent call.
Background technology
IP Multimedia System (IP Multimedia Core Network Subsystem, abbreviate IMS as) be by third generation partner program (3rd Generation PartnershipProject, abbreviate 3GPP as) a kind of IP-based network framework of proposing of tissue, it has made up an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for the user.
IMS is based on the communication network framework of IP, irrelevant with access technology, except being GPRS (General Packet Radio Service, abbreviate GPRS as), WLAN (wireless local area network) (Wireless Local Area Network, abbreviate WLAN as) etc. packet access network provide outside the business, can also be global system for mobile communications (Global Systemfor Mobile communications, abbreviate GSM as), unified mobile communcations system mobile cellular networks such as (Universal Mobile Telecommunications System abbreviate UMTS as) provides professional.
Urgent call (Emergency Call) is distinctive a kind of speech business function in the mobile communication system.As long as subscriber equipment (User Equipment, abbreviate UE as) in the zone that the mobile network covers, even the subscriber identification module of insertion (SIM) or be provided with region limits, restriction is breathed out, the user can initiate urgent call by dialing emergency numbers (as: 110,119,911 etc.); The urgent call meeting is transferred to corresponding EC (PSAP, Public Safety Answering Point), as police office, fire brigade, first-aid centre etc., provided 24 hours emergency assistance services for the user by EC.The operation of whole emergencycallboxsystem is finished by the common cooperation of emergency services such as telecom operators and public security, fire-fighting, hospital.
Generally speaking, urgent call all is middle the realization in circuit switching (Circuit Switch abbreviates CS as) territory (also can abbreviate circuit domain as); At present, along with the IPization of network, packet switching (Packet Switch abbreviates PS as) territory also begins to support emergence call service, and carries out call signaling by IMS and control and realize urgent call on the PS territory.Usually, the emergence call service that provides of IMS territory can abbreviate the IMS urgent call as.
Fig. 1 is that the packet domain (Evolved PS abbreviates EPS as) in evolution inserts down IMS emergencycallboxsystem structural framing schematic diagram.In this system, include: in order to the network element of system architecture evolution (System ArchitectureEvolution the abbreviates SAE as) network portion of bearer management that bottom is provided and mobile management; In order to policy and charging control (Policy andCharging Control the abbreviates PCC as) network element partly of setting up efficient strategy, chargeing and control at bottom bearing bed and upper-layer service layer; With thinking that urgent call provides positioning service (LocationService, LCS) network element of the address of location-based service and public safety response point (be also referred to as urgency communication and accept the center) (PublicSafety Answering Point abbreviates PSAP as); In order to control and to handle the part network element of the IMS urgency traffic of emergency call session.
Wherein, as shown in Figure 1, the network element of EPS part comprises: the wireless base station of evolution (eNodeB), the control appliance of the main interface-free resources of follow-on wireless access network, can provide higher up-downgoing speed, lower transmission delay and reliable more wireless transmission; Mobile management entity (Mobility Management Entity, abbreviate MME as), be used for management and storage UE context (such as the UE/ user ID, mobility management states, user security parameters etc.), for the user distributes temporary mark, when quartering at this tracing area or this network, is responsible for UE this user is carried out authentication; Network (GateWay, abbreviate GW as), the data route that is used for the process user face, be divided into gateway (Serving Gateway, abbreviate S-GW as) and packet data network gateway (Packet Data Network Gateway, abbreviate P-GW as), S-GW is mobile anchor point between EPS system and traditional 3GPP system and the mobile anchor point between the eNodeB, P-GW mainly is responsible for the downlink data that termination is in the UE of idle state, when the downlink data that mails to UE arrives, initiate paging, the context of management and storage UE is such as IP bearer service parameter and network internal routing iinformation etc.
PCC part network element comprises: strategy and charging control and management function (Policy andCharging Rules Function abbreviates PCRF as) are the essential functional entities of PCC framework, obtaining, assemble, issuing etc. in order to control strategy and charging regulation; Strategy and charge execution function (Policy and Charging Enforcement Function abbreviates PCEF as) are the concrete strategy and the execution point of charging, are usually located in the gateway function (GateWay is called for short GW).In the EPS network, the PCEF function is arranged in P-GW.
The positioning service network element comprises: the position obtains functional entity (Location RetrievalFunction is called for short LRF)/critical point mobile positioning center (Gateway Mobile LocationCentre is called for short GMLC).
The network element of IMS urgent call part comprises: the subscription data of the main leading subscriber of home subscriber server (HomeSubscriber Server abbreviates HSS as) is positioned at home network.CSCF (Call Session Control Function, abbreviate CSCF as) be the core network element of control conversation procedure, comprise: Proxy Call Session Control Function (Proxy-CSCF, abbreviate P-CSCF as), service call conversation control function (Serving-CSCF, abbreviate S-CSCF as), emergency call session controlled function (Emergency-CSCF abbreviates E-CSCF as).Wherein, E-CSCF is a new functional entity of introducing in the IMS territory, be arranged in same network (when the user roams, being user's visited network) with P-CSCF, the emergent session of being responsible for receiving from P-CSCF is set up request, positional information that provides according to the user or positional information and the routing iinformation that obtains from LRF are routed to urgency communication with the emergent session request of setting up and accept center (PSAP).Simultaneously, the urgency communication center of accepting can be by directly obtaining customer position information from LRF, and get in touch with home network, with the callback user.
In addition, this system also comprises: UE, urgency communication are accepted center (Public SafetyAnswering Point is called for short PSAP).
When UE moves, signal weaker need switch under the Target cell, in actual applications, has two kinds of switching modes, and a kind of is to switch in the MME, its switching flow as shown in Figure 2, another kind of for striding the MME switching, its switching flow is as shown in Figure 3.Below introduce above two kinds of switching modes respectively.
(1) switches in the MME.As shown in Figure 2, this switching flow mainly comprises the steps:
Step 201, source eNodeB judges Target cell whether in the roaming restriction tabulation of this UE, promptly this UE can not roam at Target cell, if, process ends then, otherwise source eNodeB and target eNode B cooperate the set-up procedure of finishing switching, and continue step 202;
Step 202, handover execution stage, source eNodeB notice UE switches to target eNode B, and is responsible for descending media data is transmitted to target eNode B, target eNode B and then descending medium are issued UE;
Step 203 is switched and is finished the stage, and UE cuts target eNode B, and the upstream data passage is: UE-〉target eNode B-S-GW.Target eNode B sends media path handoff request message to MME, and indication switches to descending media path on the target eNode B.MME sends user's face update inquiry information to S-GW, thereby makes downlink data channel be: S-GW-〉target eNode B-UE.
Step 204, target eNode B is carried out the tracing Area renewal process according to configure trigger UE.
(2) striding MME switches.As shown in Figure 3, this switching flow is mainly drawn together following steps:
Step 301, source eNodeB judges Target cell whether in the roaming restriction tabulation of this UE, if then process ends is not initiated to switch, otherwise, prepare to initiate to switch, continue step 302.
Step 302-step 303, after source MME received the handoff request message that source eNodeB sends, selected target MME issued target MME to handoff request then.
Step 304, target MME sends to target S-GW and creates the media bearer request, and the response of setting up media bearer of receiving target S-GW transmission, and at this moment, up medium can be dealt into P-GW from target S-GW.
Step 305, target MME sends out handoff request message to target eNode B, and target eNode B is distributed required carrying, and MME returns response message to target.At this moment, up medium can be dealt into P-GW through target S-GW from target eNode B.
Step 306, if transmit media mode indirectly (is in the handoff procedure, descending medium are forwarded to target eNode B from source eNodeB through source S-GW, target S-GW), target MME notification target S-GW set up to transmit the carrying that medium are used, and the response returned of receiving target S-GW.If directly transmit medium, then medium directly are forwarded to target eNode B from source eNodeB.
Step 307, target MME sends switching response message to source MME, and notification source MME target side has been carried out to switch and has been prepared.
Step 308, if transmit media mode indirectly, source MME notification source S-GW set up to transmit the carrying that medium are used, and the response returned of reception sources S-GW.
Step 309-step 310, source MME sends out switching command for source eNodeB, and source eNodeB is transmitted to UE with this switching command.After this descending media data is forwarded to target eNode B earlier, is dealt into UE then after UE is cut into target eNode B again.
Step 311, UE sends to switch to target eNode B and confirms that UE cuts target eNode B.
Step 312, target eNode B notification target MME, UE has cut target eNode B.
Step 313, target MME notification source MME switches and to finish, and the response returned of reception sources MME.
Step 314-step 315, target MME notification target S-GW is new bearer more, and more new bearer response of receiving target S-GW, thus descending medium can be issued UE through target eNode B from target S-GW.Target S-GW reinforms more new bearer of P-GW, and receives more new bearer response of P-GW, thereby descending medium can be dealt into target S-GW from P-GW.So far, media channel become UE＜-target eNode B＜-target S-GW＜-P-GW.
Step 316, target eNode B triggers UE and carries out the tracing Area renewal process.
Step 317-step 318, the carrying that source carrying and forwarding medium are used is released.
In the above-mentioned flow process, if Target cell drops in the roaming restriction tabulation (being that UE can not roam at Target cell), currently, UE can refuse initiate to switch toward Target cell for providing the eNodeB of Radio Resource, that is to say that network can't allow UE switch to Target cell, what carry out is urgent call if UE is current, then can cause the urgent call aborted.
Summary of the invention
In view of this, the invention provides a kind of changing method and base station of IP Multimedia System urgent call, thereby cause the problem of urgent call aborted because Target cell is the roaming restricted cell of UE in order to solve in the prior art.
According to an aspect of the present invention, provide a kind of changing method of IP Multimedia System urgent call, this method is used for subscriber equipment and switches to Target cell at emergency calling process from the cell-of-origin.
Changing method according to IP Multimedia System urgent call of the present invention comprises: when source base station is determined to initiate to switch, the urgent call bearing identification that carries in the beared information according to the media bearer of urgent call, determine that subscriber equipment is current and just carrying out urgent call, be initiated to the switching of Target cell.
Preferably, above-mentioned Target cell is the roaming restricted cell of subscriber equipment.
According to another aspect of the present invention, provide a kind of base station.
Base station according to the present invention comprises: acquisition module, parsing module and handover module.Wherein, acquisition module is used to obtain the beared information of the media bearer of current urgent call; Parsing module is used to resolve the beared information that obtains, the urgent call bearing identification that obtains carrying in the beared information, and wherein, this urgent call bearing identification is used to indicate subscriber equipment carrying out urgent call; Handover module is used for being initiated to according to the urgent call bearing identification switching of Target cell.
By above-mentioned at least one scheme of the present invention, source base station is when determining to initiate to switch, by the urgent call bearing identification that carries in the beared information according to the media bearer of current urgent call, determine whether UE is just carrying out urgent call, if, then no matter whether Target cell is the roaming restricted cell of this UE, all initiate to switch, thereby cause the problem of urgent call aborted thereby solved in the prior art because Target cell is the roaming restricted cell of UE, guaranteed normally carrying out of urgent call, for the user provides continuous emergence call service, improved user experience.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is an IMS emergencycallboxsystem structural framing schematic diagram in the correlation technique;
Fig. 2 is the flow chart of a kind of cell switching method in the correlation technique;
Fig. 3 is the flow chart of another kind of cell switching method in the correlation technique;
Fig. 4 is existing processing signaling flow chart of initiating urgent call the user of IMS territory normal registration at local network;
Fig. 5 is the flow chart of setting up of existing urgent call media bearer;
Fig. 6 is the structured flowchart according to the base station of the embodiment of the invention;
Fig. 7 is the implementing procedure figure of embodiment one;
Fig. 8 is the implementing procedure figure of embodiment two.
Embodiment
Functional overview
In order to make UE when carrying out urgent call, can switch to the limited Target cell of roaming, the embodiment of the invention provides a kind of handover scheme of IMS urgent call.In this scheme, UE is initiating urgent call, in the process of the media bearer of setting up this urgent call, in beared information, carry the urgent call bearing identification, when source eNodeB determines to switch, judge according to this urgent call bearing identification that UE is current and whether just carrying out urgent call, just carrying out urgent call as long as this UE is current, source eNodeB just initiates switching flow, and no matter whether Target cell is the roaming restricted cell of this UE.
Under the situation of not conflicting, embodiment and the feature among the embodiment among the present invention can make up mutually.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
For the ease of understanding, before the embodiment to the embodiment of the invention described, at first the flow process of setting up to UE initiation urgent call and urgent call media bearer was briefly described.
Fig. 4 is the processing signaling flow chart of having initiated urgent call the user of IMS territory normal registration at local network.As shown in Figure 4, UE initiates urgent call at local network, and the urgent call processing procedure comprises the steps:
Step 401, UE registers at S-CSCF;
UE need set up emergency bearing at EPS (Evolved Packet System, evolved packet system) bearer network before initiating urgent call, and the MME among the EPS is responsible for mobile management and user's chain of command functions such as authentication.
Step 402, UE initiates the IMS emergency call request;
Step 403, P-CSCF judges whether this call request is emergency call request after receiving the call request of UE initiation, if not emergency call request, then according to the ordinary call flow processing, this flow process finishes; Otherwise, execution in step 404;
Step 404, P-CSCF is routed to local E-CSCF according to local policy with call request; Wherein, the address of E-CSCF can be in P-CSCF static configuration;
Step 405 after E-CSCF receives emergency call request, is obtained function (Location Retrieval Function abbreviates LRF as) transmission position to the position and is obtained message, comprises the positional information of UE in the message.After LRF receives that the position obtains message, on LRF, obtain the routing address of local PSAP, and the address of PSAP is returned to E-CSCF according to the positional information of the UE that comprises in the message;
Step 406, E-CSCF sends to local PSAP according to the routing address of PSAP with urgent call; If do not find corresponding PSAP address, E-CSCF can send to urgent call the local PSAP of acquiescence; Wherein, PSAP can be arranged in CS territory, PS territory or the public switch telephone network (Public Switched Telephone Network abbreviates PSTN as);
Step 407, PSAP confirms this calling, sets up emergent session between UE and PSAP, comprises the media bearer that urgent call is required.
Fig. 5 is the flow chart of setting up of urgent call media bearer, and as shown in Figure 5, the foundation master of urgent call media bearer may further comprise the steps:
Step 501, P-CSCF is notified to PCRF with the emergence call service session related information after media negotiation is finished;
Step 502, the decision that PCRF finishes strategy and charges offers P-GW to above-mentioned relevant information;
Step 503, UE, eNodeB, MME, S-GW, P-GW cooperate the foundation of finishing media bearer alternately.
The basic thought of the embodiment of the invention is in setting up the media bearer process of urgent call, in the beared information of this media bearer, carry a urgent call bearing identification, the ongoing calling of indication current UE is urgent call, source eNodeB is when preparing to initiate to switch, judge the current urgent call that is according to this sign with carrying out, then no matter whether Target cell is the roaming restricted cell, all switches.
According to the embodiment of the invention, a kind of changing method of IMS urgent call at first is provided, this method is used for UE and switches to Target cell at emergency calling process from the cell-of-origin.
Changing method according to the IMS urgent call of the embodiment of the invention mainly comprises: when source base station is determined to initiate to switch, the urgent call bearing identification that carries in the beared information according to the media bearer of the ongoing calling of current UE, determine that this UE is current and just carrying out urgent call, be initiated to the switching of Target cell, preferably, this Target cell can be the roaming restricted cell of this UE.
In specific implementation process, state on the implementation before the processing, UE initiates urgent call, in setting up the media bearer process of this urgent call, carries the urgent call bearing identification in the beared information of this media bearer, indicates that this UE is current to carry out urgent call.
Particularly, above-mentioned urgent call bearing identification can be initiated urgent call by UE, in the process of setting up the required media bearer of urgent call (promptly urgent call flow process and media bearer as shown in Figure 4 and Figure 5 set up process), carry this urgent call bearing identification in the beared information of media bearer, the implementation of this process includes but not limited to following dual mode:
(1) determines that by UE the current calling of carrying out is urgent call.This mode mainly may further comprise the steps:
Step 1:UE sends emergency call request to P-CSCF, wherein, carries the urgent call sign in this emergency call request;
After step 2:P-CSCF receives above-mentioned emergency call request,, be carried at and send to PCRF in the session information carrying sign that indication UE carrying out urgent call according to its urgent call of carrying sign;
In specific implementation process, after P-CSCF receives the emergency call request of UE, after media negotiation is finished, in the process of resource authorization, P-CSCF sends to PCRF with relevant session information, in embodiments of the present invention, P-CSCF carries the sign that indication UE is carrying out urgent call according to the urgent call sign of carrying in the emergency call request that receives in sending to the PCRF session information.
Step 3:PCRF sends to P-GW with session information;
In specific implementation process, PCRF sends to P-GW with the session information from P-CSCF that receives after the decision of finishing strategy and chargeing.
Step 4:P-GW is setting up in the process of media bearer alternately with S-GW, UE, source eNodeB, source MME, carrying out the sign of urgent call according to the indication UE that carries in the above-mentioned session information, in the beared information of media bearer, carry above-mentioned urgent call bearing identification, and source eNodeB and source MME will preserve this urgent call bearing identification.
(2) P-CSCF determines that UE is current and is just carrying out urgent call, and the realization of this mode mainly may further comprise the steps:
After step 1:P-CSCF receives the call request of UE, determine that this call request is emergency call request (being that UE is initiating urgent call), the urgent call sign is carried at sends to PCRF in the session information;
Step 2:PCRF sends to P-GW with session information;
Step 3:P-GW is setting up in the process of media bearer alternately with S-GW, UE, source eNodeB, source MME, according to the emergent session sign of carrying in the above-mentioned session information, in the beared information of media bearer, carry above-mentioned urgent call bearing identification, and source eNodeB and source MME will preserve this urgent call bearing identification.
In specific implementation process, can utilize the distribution of the QoS in the beared information and keep priority tag and indicate that UE is current just to carry out urgent call, also can utilize the class letter of QoS to indicate that UE is current just to carry out urgent call.Certainly, also can in beared information, increase a current sign of whether just carrying out urgent call of expression UE newly.
If source eNodeB determines that according to the urgent call bearing identification in the beared information current UE carrying out urgent call, determine to be initiated to the switching of Target cell, then source eNodeB sends the handoff request that carries above-mentioned urgent call bearing identification to source MME; Source MME is transmitted to target MME with this handoff request, and target MME preserves this urgent call bearing identification, and initiates follow-up switching flow.
After this UE switches to Target cell, target eNode B sends the tracing Area update notification to UE, indication UE initiates tracing Area and upgrades, UE is after receiving this notice, send the tracing Area update request to target MME, target MME is according to the above-mentioned urgent call bearing identification of preserving, and determines that this UE is current to carry out urgent call, then no matter whether Target cell is the roaming restricted cell, all keeps the relevant bearer of the above-mentioned urgent call of having set up.
The changing method of the above-mentioned IMS urgent call that provides according to the embodiment of the invention can switch to this Target cell with the UE that carries out urgent call when Target cell is roaming cell.
According to the embodiment of the invention, also provide a kind of base station.
Fig. 6 is the structured flowchart according to the base station of the embodiment of the invention, as shown in Figure 6, comprises according to the base station of the embodiment of the invention: acquisition module 61, parsing module 63 and handover module 65.Wherein, acquisition module 61 obtains the beared information of the media bearer of current urgent call; Parsing module 63 is connected with acquisition module 61, is used to resolve the beared information that acquisition module 61 obtains, the urgent call bearing identification that obtains carrying in the beared information, and wherein, this urgent call bearing identification is used to indicate UE carrying out urgent call; Handover module 65 is connected with parsing module 63, and the urgent call bearing identification that is used for obtaining according to parsing module 63 is initiated to the switching of Target cell.Wherein, this Target cell can be the roaming restricted cell of this UE.
According to the above-mentioned base station of the embodiment of the invention, can when UE carries out urgent call, this UE be switched to the limited Target cell of its roaming.
The specific implementation process of the technical scheme that the embodiment of the invention is provided with specific embodiment is described below.
Embodiment one
Present embodiment is to switch to example in the MME, the above-mentioned changing method that the embodiment of the invention is provided is described.
Fig. 7 is the particular flow sheet of present embodiment, and in this embodiment, UE moves to Target cell, currently just calls out, and as shown in Figure 7, the above-mentioned changing method that provides according to the embodiment of the invention carries out the change owner of MME inscribe and will may further comprise the steps:
Step S701, the urgent call bearing identification that carries in the beared information of source eNodeB according to the media bearer of current calling judge that UE is current and whether just carrying out urgent call, if, prepare to initiate to switch, continue step S702, if not, then carry out according to the flow process among Fig. 2;
Step S702, handover execution stage, source eNodeB notice UE switches to target eNode B, and is responsible for descending media data is transmitted to target eNode B, target eNode B and then descending medium are issued UE;
Step S703 switches and finishes the stage, and UE cuts target eNode B, and the upstream data passage is: UE-〉target eNode B-S-GW.Target eNode B is sent out media path handoff request message to MME, and indication switches to descending media path on the target eNode B, can carry above-mentioned urgent call bearing identification in this request.MME sends user's face update inquiry information to S-GW, thereby makes downlink data channel be: S-GW-〉target eNode B-UE.
Step S704, target eNode B is carried out the tracing Area renewal process according to configure trigger UE, UE sends to MME and follows the trail of update request, MME judges according to above-mentioned urgent call bearing identification that UE is current and is just carrying out urgent call, then no matter whether Target cell is the roaming restricted cell, all keeps the relevant bearer of this urgent call of having set up.
Embodiment two
This embodiment switches to example to stride MME, and the concrete enforcement of the technical scheme that the embodiment of the invention is provided is described in detail.
Fig. 8 is the implementing procedure figure of present embodiment, and as shown in Figure 8, present embodiment mainly may further comprise the steps:
Step S801, the urgent call bearing identification that carries in the beared information of source eNodeB according to the media bearer of current calling judge whether UE is carrying out urgent call, if, then need to initiate to switch, continue step S802, otherwise, handle according to the flow process of above-mentioned Fig. 3;
Like this, even Target cell limits in the tabulation in the roaming of this UE, but carrying out urgent call owing to UE is current, therefore, source eNodeB still determines to be initiated to the switching of Target cell.
After step S802-step S803, source MME received the handoff request message that source eNodeB sends, selected target MME issued target MME to handoff request then;
Wherein, carry the urgent call bearing identification in the above-mentioned handoff request, thereby make target MME can judge that UE is carrying out urgent call, and then after switching was finished, target MME can make suitable processing according to this sign when UE initiated TAU.
Step S804, target MME creates the media bearer request to target S-GW;
After carrying out the processing of above-mentioned steps, up medium can be dealt into P-GW from target S-GW.
Step S805, target MME sends out handoff request message to target eNode B, and target eNode B is distributed required carrying after receiving this handoff request message, and MME returns response message to target;
Wherein, carry the urgent call bearing identification in the above-mentioned handoff request, can judge that according to this urgent call bearing identification target eNode B UE is carrying out urgent call, if follow-up also the needs switches, then target eNode B can normally be initiated to switch.Execute after the processing of above-mentioned steps, up medium can be dealt into P-GW through target S-GW from target eNode B.
Step S806, the forwarding media mode (is in the handoff procedure if adopt indirectly, descending medium are forwarded to target eNode B from source eNodeB through source S-GW, target S-GW), target MME notification target S-GW sets up and transmits the carrying that medium are used, target S-GW is after setting up relevant bearer, and MME returns response message to target;
If adopt when directly transmitting medium, then medium directly are forwarded to target eNode B from source eNodeB.
Step S807, target MME send out switching response message for source MME, and notification source MME target side has been carried out to switch and prepared;
Step S808 transmits media mode indirectly if adopt, and source MME notification source S-GW sets up and transmits the carrying that medium are used, and after source S-GW set up relevant bearer, MME returned response message to the source;
Step S809-step S810, source MME sends out switching command to source eNodeB, and source eNodeB issues UE to switching command;
Carry out after the processing of above-mentioned steps, descending media data is forwarded to target eNode B earlier, is dealt into UE then after UE is cut into target eNode B again.
Step S811, UE cuts target eNode B, and sends switch acknowledgment message to target eNode B;
Step S812, target eNode B sends switching notice to target MME, and notice UE has cut target eNode B;
Step S813, target MME send to switch to source MME and finish notice, and source MME receives this notice back and returns response message to target MME;
Step S814-step S815, target MME sends the bearer update request to target S, and target S-GW upgrades the back and returns response message to target MME; Carry out after the above-mentioned steps processing, descending medium can be issued UE through target eNode B from target S-GW.Then, ` target S-GW sends the bearer update request to P-GW, and after P-GW upgraded relevant bearer, S-GW returned response to target, carried out after the processing of above-mentioned steps, and descending medium can be dealt into target S-GW from P-GW;
Execute after the processing of above-mentioned steps, the current media passage be UE＜-target eNode B＜-target S-GW＜-P-GW.
Step S816, target eNode B triggers UE and carries out the tracing Area renewal process.Because target MME known that UE is carrying out urgent call, therefore, no matter whether the UE incision is the roaming restricted cell, and target MME does not discharge the relevant bearer of the above-mentioned urgent call of having set up, and urgent call still can normally be carried out after switching.
Step S817-step S818, between source MME and the source eNodeB, carry out between source MME and the source S-GW mutual, the resource that deletion and releasing bearing and forwarding medium are used.
As mentioned above, the technical scheme that provides by the embodiment of the invention, source eNodeB is when determining to initiate to switch, the urgent call bearing identification that carries in the beared information of the media bearer by current urgent call is judged that UE is current and whether is just being carried out urgent call, if, then whether the Target cell no matter UE cuts roams restricted cell, source eNodeB is initiated to the switching of Target cell, thereby avoided because Target cell is the roaming restricted cell, and cause the problem of urgent call aborted, make urgent call can switch to the roaming restricted cell, thereby reach the purpose that the emergence call service of connection is provided to the user, improve user experience; And after switching was finished, UE initiated TAU, MME judges that according to above-mentioned urgent call bearing identification UE is just carrying out urgent call, then keep the relevant carrying of urgent call of having set up, thereby preserved carrying out smoothly of urgent call, further improved user experience.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the changing method of an IP Multimedia System urgent call is used for subscriber equipment and switches to Target cell at emergency calling process from the cell-of-origin, it is characterized in that, described method comprises:
In setting up the media bearer process of urgent call, in the beared information of described media bearer, carry the urgent call bearing identification, wherein, described urgent call bearing identification is used to indicate described subscriber equipment carrying out urgent call;
When source base station determine to initiate switched, according to described urgent call bearing identification, determining that described subscriber equipment is current was just carrying out urgent call, is initiated to the switching of described Target cell.
2. method according to claim 1 is characterized in that, the process of carrying described urgent call bearing identification in beared information comprises:
Described subscriber equipment sends emergency call request to proxy call conversation control function entity, wherein, carries first urgent call sign in the described emergency call request;
Described proxy call conversation control function entity identifies according to described first urgent call, and the session information that carries second urgent call sign is sent to strategy and charging control and management functional entity;
Described strategy and charging control and management functional entity send to packet data gateway with described session information;
Described packet data gateway is being set up in the process of described media bearer alternately with gateway, described subscriber equipment, described source base station, described source mobile management entity, according to described second urgent call sign, in the described beared information of described media bearer, carry described urgent call bearing identification.
3. method according to claim 1 is characterized in that, the process of carrying described urgent call bearing identification in beared information comprises:
After proxy call conversation control function entity receives the emergency call request of described subscriber equipment, determine that described subscriber equipment is carrying out urgent call, the session information that carries the urgent call sign is sent to strategy and charging control and management functional entity;
Described strategy and charging control and management functional entity send to packet data gateway with described session information;
Described packet data gateway is being set up in the process of described media bearer alternately with gateway, described subscriber equipment, described source base station, described source mobile management entity, according to described urgent call sign, in the described beared information of described media bearer, carry described urgent call bearing identification.
4. according to each described method of claim 1 to 3, it is characterized in that described urgent call bearing identification comprises: the distribution of service quality QoS and reservation priority tag, or the class letter of QoS.
5. method according to claim 1 is characterized in that, the switching that described source base station is initiated to described Target cell comprises:
Described source base station sends handoff request to the source mobile management entity, wherein, carries described urgent call bearing identification in the described handoff request;
Described source mobile management entity is transmitted to the target mobile management entity with described handoff request, and described target mobile management entity is preserved described urgent call bearing identification, and initiates switching flow.
6. method according to claim 5 is characterized in that, after described switching flow was finished, described method also comprised:
The tracing Area update notification that described subscriber equipment receiving target base station sends, wherein, described tracing Area update notification is used to indicate described subscriber equipment to initiate the tracing Area renewal;
Described subscriber equipment sends the tracing Area update request to described target mobile management entity;
Described target mobile management entity determines that according to the described urgent call bearing identification of preserving described subscriber equipment is carrying out urgent call, keeps the media bearer with the described urgent call of having set up.
7. method according to claim 1 is characterized in that, described Target cell is the roaming restricted cell of described subscriber equipment.
8. a base station is characterized in that, comprising:
Acquisition module is used to obtain the beared information of the media bearer of current urgent call;
Parsing module, be used to resolve the described beared information that obtains, obtain the urgent call bearing identification that carries in the described beared information, wherein, described urgent call bearing identification is in setting up the media bearer process of described urgent call, carry in the beared information of described media bearer, described urgent call bearing identification is used to indicate subscriber equipment carrying out urgent call;
Handover module is used for being initiated to according to described urgent call bearing identification the switching of Target cell.
9. base station according to claim 8 is characterized in that, described Target cell is the roaming restricted cell of described subscriber equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101753510A CN101577888B (en) | 2008-11-06 | 2008-11-06 | Method and base station for switching IP multimedia subsystem emergency calls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101753510A CN101577888B (en) | 2008-11-06 | 2008-11-06 | Method and base station for switching IP multimedia subsystem emergency calls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101577888A CN101577888A (en) | 2009-11-11 |
| CN101577888B true CN101577888B (en) | 2011-12-07 |
Family
ID=41272637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101753510A Expired - Fee Related CN101577888B (en) | 2008-11-06 | 2008-11-06 | Method and base station for switching IP multimedia subsystem emergency calls |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101577888B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149060A (en) * | 2010-02-10 | 2011-08-10 | 华为技术有限公司 | Method and system for identifying emergency call service |
| CN103052053B (en) * | 2010-02-12 | 2016-03-02 | 华为技术有限公司 | Priority service processing method, device and system |
| CN101827345B (en) * | 2010-05-14 | 2015-06-10 | 中兴通讯股份有限公司 | Method, system and terminal for realizing emergency EPS service |
| CN102378140B (en) * | 2010-08-19 | 2015-08-12 | 中兴通讯股份有限公司 | Emergency call realization method, interoperability functive, mobile switching centre and base station |
| US10542452B2 (en) | 2014-06-10 | 2020-01-21 | Apple Inc. | Enhancing quality of service for high priority services |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031135A (en) * | 2006-03-03 | 2007-09-05 | 华为技术有限公司 | Emergent calling method and system |
| KR100799195B1 (en) | 2007-01-12 | 2008-01-29 | 삼성전자주식회사 | Apparatus and method for connecting emergency call in portable terminal |
| CN101175248A (en) * | 2007-09-28 | 2008-05-07 | 中兴通讯股份有限公司 | Urgent call implementing method and system for IP multimedia subsystem centralized control business |
-
2008
- 2008-11-06 CN CN2008101753510A patent/CN101577888B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031135A (en) * | 2006-03-03 | 2007-09-05 | 华为技术有限公司 | Emergent calling method and system |
| KR100799195B1 (en) | 2007-01-12 | 2008-01-29 | 삼성전자주식회사 | Apparatus and method for connecting emergency call in portable terminal |
| CN101175248A (en) * | 2007-09-28 | 2008-05-07 | 中兴通讯股份有限公司 | Urgent call implementing method and system for IP multimedia subsystem centralized control business |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101577888A (en) | 2009-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102673607B1 (en) | Wireless device paging by a wireless network | |
| US11889471B2 (en) | Paging time adjustment in a wireless network | |
| US11770736B2 (en) | Method and device for controlling congestion in mobile communication system | |
| US9699763B2 (en) | Network node, method, and mobile terminal for providing voice calls to a mobile terminal in a packet-switched-only network | |
| CN106605430B (en) | Wireless network paging transmission and response | |
| US8718043B2 (en) | Mobile communication method and system for signalling information relating to network's capabilities | |
| US20160014644A1 (en) | Method and apparatus for providing voice call in mobile communication system and system thereof | |
| AU2017405271A1 (en) | Session management method and SMF node | |
| CN101166364A (en) | A method and system for realizing continuous voice call in emergent service | |
| CN101577891A (en) | Method and system for downloading emergency numbers of network side | |
| CN101730036B (en) | Method, device and user facility for changing attachment state | |
| CN101938727B (en) | Method and system for realizing emergency call | |
| CN101577888B (en) | Method and base station for switching IP multimedia subsystem emergency calls | |
| CN104093124B (en) | Location-based service providing method | |
| US20240015584A1 (en) | Method and device for controlling congestion in mobile communication system | |
| CN101577882B (en) | Emergency call realization system and method for IP multimedia subsystem | |
| CN101277518B (en) | Method for processing emergency service | |
| CN101730035A (en) | Processing method for attaching user equipment (UE), mobility management entity (MME) and UE | |
| CN101384081A (en) | Method and apparatus for transmitting service anchor positioning information | |
| CN101577892A (en) | Method for avoiding influence of service restriction on emergency call continuity | |
| EP2437543B1 (en) | Local circuit switched fallback cancellation mechanism | |
| CN101854583B (en) | Location-based service provide method | |
| CN101389130A (en) | Core network entity and switching method based on VCC speech calling | |
| CN101800958A (en) | Method and system for obtaining emergency session information | |
| GB2434058A (en) | Network capability to transmit voice information via a packet switched network portion |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20191106 |