CN104093124A - Position service providing method - Google Patents
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- CN104093124A CN104093124A CN201410252742.3A CN201410252742A CN104093124A CN 104093124 A CN104093124 A CN 104093124A CN 201410252742 A CN201410252742 A CN 201410252742A CN 104093124 A CN104093124 A CN 104093124A
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Abstract
The invention provides a position service providing method. The position service providing method is used for providing position services for UE after the UE is switched to a target access network from a source access network, and comprises: a source position server receiving a position query request from a sender, the query request carrying the identification of the UE; and the source position server, according to the address of a target position server, triggering the target position server to obtain the position information of the UE. According to the invention, during a session process when the UE is switched to the target access network from the source access network, the continuity of UE position services can be ensured.
Description
Technical field
The present invention relates to mobile communication technology field, relate in particular to a kind of location-based service supplying method.
Background technology
IP Multimedia System (IP Multimedia Core Network Subsystem, referred to as IMS) be by third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) tissue propose the IP-based network architecture of one, it has built an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for user.
IMS is IP-based communication network framework, irrelevant with access technology, except being GPRS (General Packet Radio Service, referred to as GPRS), WLAN (wireless local area network) (Wireless Local Area Network, referred to as WLAN) etc. packet access network provide outside business, can also be global system for mobile communications (Global System for Mobile communications, referred to as GSM), unified mobile communcations system (Universal Mobile Telecommunications System, referred to as UMTS) etc. mobile cellular network business is provided.
Urgent call (Emergency Call) is distinctive a kind of speech business in mobile communication system.In this business, as long as in the region that mobile terminal covers mobile network, even the subscriber identification module of insertion (Subscriber Identity Module, referred to as SIM) or be provided with restriction exhalation, all can by dial emergency numbers (such as, 110,119,911 etc.) initiate urgent call; Urgent call meeting is transferred to corresponding urgency communication and accepts center (Public Safety Answering Point, referred to as PSAP), such as, police office, fire brigade, first-aid centre etc., provide the emergency assistance services of 24 hours by EC for user.The operation of whole emergencycallboxsystem has been cooperated jointly by emergency services such as telecom operators and public security, fire-fighting, hospitals.
Generally, urgent call is all at circuit switching (Circuit Switch, referred to as CS) realize in territory (also can referred to as circuit domain), at present, along with the progressively IPization of network, packet switching (Packet Switch, referred to as PS) territory also starts progressively to support emergence call service, and utilizing IMS to carry out call signaling control to emergent session, the emergence call service that IMS territory provides conventionally can be referred to as IMS urgent call.
At present, IMS emergencycallboxsystem comprises: subscriber equipment (User Equipment, referred to as UE), Proxy Call Session Control Function (Proxy Call Session Control Function, referred to as P-CSCF), service call conversation control function (Serving Call Session Control Function, referred to as S-CSCF), home subscriber server (Home Subscriber Server, referred to as HSS), emergency call session control function (Emergency Call Session Control Function, referred to as E-CSCF), position acquisition function (Location Retrieval Function, referred to as LRF) and urgency communication accept center (Public Safety Answering Point, referred to as PSAP).Wherein, P-CSCF is for forwarding request and the response between UE and S-CSCF as agency.S-CSCF is the home service entity of UE, is used to UE that the function such as service logic and control of authority is provided.HSS is for preserving the information such as user's register information and the business of customization.LRF is for providing active user's positional information to network.PSAP is emergency call service center, is responsible for the urgent call of accepted user.
Along with the development of network architecture flattening, and the appearance of the removable access way of multiple high-speed wideband, at present, Long Term Evolution (Long-Term Evolution has been proposed, referred to as LTE)/System Architecture Evolution (System Architecture Evolution, referred to as SAE) framework theory of future generation, this framework can make the wireless communication system of evolution that higher transmission rate is provided, shorter transmission delay and lower cost, also support the mobility between the inner connecting system of 3GPP simultaneously, and mobility between 3GPP connecting system and non-3GPP connecting system etc.In addition, LTE/SAE also, using the one access means as IMS territory, supports the successional function of original voice conversation.Fig. 1 adopts LTE/SAE access architecture to realize the Organization Chart of IMS urgent call, and as shown in Figure 1, wherein, the respective network elements of LTE/SAE mainly comprises:
The wireless access network (Evolved UTRAN, referred to as E-UTRAN) of evolution is follow-on wireless access network, and higher up-downgoing speed can be provided, lower transmission delay and more reliably wireless transmission.
Mobile management entity (Mobility Management Entity, referred to as MME) be chain of command functional entity, be in charge of and store UE context (such as, UE/ user ID, mobility management states, user security parameters etc.), be user assignment temporary mark, in the time that quartering at this tracing area or this network, is responsible for UE this user to carry out authentication.
SAE gateway (SAE Gateway, referred to as SAE GW) be user plane functions entity, be responsible for user face data route processing, can be divided into service SAE gateway (Serving SAEGW, referred to as SGW) and public data network gateway (Public Data Network, referred to as PDN GW or PGW).SGW is the mobile anchor point between SAE system and traditional 3GPP system, and mobile anchor point between E-UTRAN.The terminate downlink data of the UE in idle state of PDN GW, in the time mailing to the downlink data of UE and arrive, initiates paging; And the context of management and storage UE, such as IP bearer service parameter and network internal routing iinformation etc.
When after UE access network, network need to have the ability of positioning UE position, can realize real-time location service operation.Wherein, location service refers to that mobile network obtains the positional information of mobile terminal by specific location technology, and for terminal use provides Additional Services, this business can be applicable to emergency relief, navigation tracking, transportation dispatching, mobile yellow pages etc.
At network side, location-based service part mainly comprises: LRF (Location Require Function, position requests function), it is a logical functional entity, be defined in IMS urgent call framework, be used to E-CSCF that user's position is provided, and based on the suitable PSAP of this location lookup; Gateway Mobile Location Center (Gateway Mobile Location Center, referred to as GMLC), for providing subscriber location function in core net.Conventionally, LRF function belongs to a part of GMLC.
When UE is linked into after the access network of source, can pass through source access network, if CS network or EPS network insertion are to IMS system.When UE is in the time that source access network carries out IMS emergent session business, UE has moved to target access network simultaneously, as CS network or EPS network, between access network between transfer period, both need to ensure the emergent session continuity of IMS emergent session speech business in source access network and target access network, also needed to ensure the location service continuity of source access network and target access network.
At present, in order to ensure the successional framework solution of location service as shown in Figure 2.When UE is by source access network (CS network, EPS network, GPRS network etc.) while carrying out IMS urgent call, UE carries the positional information of UE to the E-CSCF network element of IMS network in session request, E-CSCF is to the positional information of LRF verification or inquiry UE, LRF sets up session report for this emergent session, by the positional information of UE, access network address, source, UE mark waits puts into session report, and distribute urgency traffic inquiry code (Emergency Service Query Key, referred to as ESQK) carry out corresponding with this session report, then LRF obtains the address of PSAP according to the positional information of UE, and by PSAP address, the positional information of UE, ESQK returns to E-CSCF, E-CSCF will carry the positional information of UE, PSAP is issued in the session request of ESQK, thereby PSAP and UE set up IMS emergent session.In emergent session process, if UE moves, PSAP can carry out by LRF the renewal position enquiring of UE.
When UE moves to target access network, such as CS network, EPS network, GPRS network etc., now UE need to be switched to emergent session target access network, and needs the switching of emergency location business.In the time that UE is switched to target access network, LRF need to determine the GMLC in target access network, and location service request is issued to target GMLC, thereby realizes the continuity switching of location service.
In the successional framework solution of existing location service, a kind of flow process that ensures the successional method of location service as shown in Figure 3, mainly comprises the following steps:
Step S301, UE carry out IMS emergent session at source access network (CS/EPS/GPRS/CDMA2000) with PSAP, in session is carried out, UE has moved to target access network (CS/EPS/GPRS/CDMA2000), UE sends out wireless measurement report to source access network, source access network initiation session is switched, and IMS urgent call is switched to target access network by source access network.
Step S302, target access network network element (MME/MSC etc.) be to target GMLC launch position report request, carries the information such as IP address of UE id, objective network.
Step S303, target GMLC initiate access network update request to LRF, carry the information such as IP address, target GMLC address of UE id, objective network.Wherein, the address of LRF can be by operator's static configuration in target GMLC and source GMLC.
Step S304, LRF carry access network address information in renewal position message, and target GMLC is pointed to in position enquiring address.Then initiate to cancel message to source GMLC, be released in the resource of source GMLC.
The positional information that step S305, PSAP can upgrade to LRF inquiry UE by ESQK.
Step S306, LRF carry UE id in the query messages of position, then inquire about the positional information of UE to target GMLC.
Step S307, target GMLC inquire about to target access network, and the positional information that target access network is upgraded UE returns to target GMLC.
The positional information that step S308, target GMLC upgrade UE returns to LRF.
The positional information that step S309, LRF upgrade UE returns to PSAP.
In prior art, the idiographic flow two of the successional method of another kind of guarantee location service as shown in Figure 4, mainly comprises the following steps:
Step S401, identical with the step S301 in Fig. 3.
Step S402, source access network network element (MME/MSC etc.) be to source GMLC launch position report update request, carries the information such as IP address of UE id, objective network.
Step S403, source GMLC initiate access network update request to LRF, carry the information such as IP address of UE id, objective network.Wherein, the address of LRF can be by operator's static configuration in target GMLC and source GMLC.
Step S404, LRF upgrade the access network address information in position message, and according to target GMLC of access network address assignment, then target GMLC are pointed to in position enquiring address.
Step S405, LRF initiate to cancel message to source GMLC, are released in the resource of source GMLC.
The positional information that step S406, PSAP can upgrade to LRF inquiry UE by ESQK.
Step S407, LRF carry UE id in the query messages of position, then inquire about the positional information of UE to target GMLC.
Step S408, target GMLC inquire about to target access network, and the positional information that target access network is upgraded UE returns to target GMLC.
The positional information that step S409, target GMLC upgrade UE returns to LRF.
The positional information that step S410, LRF upgrade UE returns to PSAP.
Above-mentioned two kinds ensure that the successional frameworks of location service and method are the scenes that belongs to same LRF based on source GMLC and target GMLC.But along with the development of network technology, due to the existence of multiple access network, different LRF can manage different GMLC list (GMLC list), i.e. source LRF managed source GMLC list, target LRF management objectives GMLC list; Or the functional unification of GMLC/LRF, a zonal location server permeates.Under this scene, when UE moves to after target access network, the location-based service of target access network is provided by target GMLC/LRF, instead of be anchored on the LRF of source, according to the successional method of existing techniques in realizing user's location service, because therefore source LRF and target GMLC are without any interface,, cannot realize the continuity of location service, cause position service disruption in conversation procedure.
Summary of the invention
In view of this, the invention provides a kind of improved location-based service supplying method, in order to solve in the situation that source LRF and target LRF provide location-based service for zones of different, UE is switched to the problem that may cause location-based service to be interrupted the conversation procedure of target access network from source access network.
According to an aspect of the present invention, provide a kind of location-based service supplying method, the method for UE from source access network is switched to target access network for UE provides location-based service.
Location-based service supplying method according to the present invention comprises: source position server receives the position enquiring request from transmit leg, wherein, carries the mark of UE in this inquiry request; Source position server is according to the address of target location server, and triggering target location server obtains the positional information of UE.
By such scheme of the present invention, by source position server in the time receiving position enquiring request, position enquiring request is forwarded to target location server or the request of notice sending direction target location server transmission position enquiring, adopt target location server to realize location service, in the situation that source LRF and target LRF provide location-based service for zones of different, when UE is switched to the conversation procedure of target access network from source access network, ensure the continuity of UE location-based service.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in write specification, claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 is the Organization Chart that available technology adopting LTE/SAE access architecture is realized IMS urgent call;
Fig. 2 ensures the successional framework schematic diagram of location service in prior art;
Fig. 3 is a kind of successional method flow diagram of location service that ensures in prior art;
Fig. 4 is the another kind of successional method flow diagram of location service that ensures in prior art;
Fig. 5 is embodiment of the present invention UE carries out session switching schematic diagram from source access network to target access network from;
Fig. 6 is according to the flow chart of a kind of location-based service supplying method of the embodiment of the present invention;
Fig. 7 is according to the flow chart of the another kind of location-based service supplying method of the embodiment of the present invention;
Fig. 8 is the flow chart of embodiment mono-;
Fig. 9 is the flow chart of embodiment bis-;
Figure 10 is the flow chart of embodiment tri-;
Figure 11 is the flow chart of embodiment tetra-;
Figure 12 is the flow chart of embodiment five.
Embodiment
Functional overview
Due to the existence of multiple access network, different LRF can manage different GMLC list (GMLC list), i.e. source LRF managed source GMLC list, target LRF management objectives GMLC list; Or the functional unification of GMLC/LRF, a zonal location server permeates.As shown in Figure 5, when UE moves to after target access network, the location-based service of target access network is provided by target GMLC/LRF, instead of be anchored on the LRF of source, therefore, in order to ensure that UE is switched to the continuity of location-based service in the conversation procedure of target access network, need to provide location-based service by target location server.
In order to realize the continuity of the location-based service of UE in conversation procedure, in embodiments of the present invention, two kinds of location-based service supplying methods are adopted, wherein, in first method, when business network control unit is upgraded the request message of location server in the instruction that receives source position server or the transmission of target location server, send update request message to target location server, the request location-based service anchor point that is UE by target location server update, the position anchor point using target location server as UE provides location-based service for UE; In the second method of the embodiment of the present invention, do not upgrade the location-based service anchor point of UE, source position server is still as the location-based service anchor point of this UE, source position server is in the time receiving the position enquiring request of transmit leg transmission, position enquiring request is forwarded to target location server, or send redirect message to transmit leg, position enquiring request is sent to target location server by request transmit leg, thereby triggering target location server obtains the positional information of UE.
In IMS service network, above-mentioned business network control unit can be E-CSCF, and above-mentioned transmit leg is E-CSCF or PSAP, and location server is GMLC or LRF.
Wherein, as shown in Figure 1, the new functional entity that E-CSCF introduces as IMS territory, itself and P-CSCF are arranged in same network (being user's visited network in the time that user roams), the emergent session of being responsible for receiving from P-CSCF is set up request, the positional information providing according to user or the positional information of obtaining from LRF and routing iinformation, the emergent session request of setting up is routed to the urgency communication that is connected to IP network through Mm and accepts center (PSAP), or process Mi/Mg interface route is to being connected to PSTN (Public Switch Telephone Network, be called for short PSTN) urgency communication accept center.Meanwhile, the urgency communication center of accepting can directly obtain by Le interface customer position information from LRF, and contacts by Mm/Mw interface and home network, with callback user.
In the situation that not conflicting, the feature in embodiment and embodiment in the application can combine 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 for description and interpretation the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, first a kind of location-based service supplying method is provided, for UE from source access network is switched to target access network for UE provides location-based service.
Fig. 6 is according to the flow chart of the location-based service supplying method of the embodiment of the present invention, as shown in Figure 6, mainly comprises the following steps (step S601-step S603) according to the location-based service supplying method of the embodiment of the present invention:
Step S601: target location server receives the update request message that business network control unit sends, and wherein, carries the mark of UE in this update request message, the location-based service anchor point that to be used to indicate target location server update be UE;
Step S603: the position anchor point using target location server as UE also provides location-based service for UE.
In existing IMS business network, above-mentioned business network control unit can be E-CSCF.
Below further describe the details of above-mentioned each processing.
(1) step S601
In specific implementation process, the processing of step S601 can trigger in the following manner:
Step 1, UE from source access network (such as, CS, EPS, GPRS or CDMA2000) be switched to target access network (such as, CS, EPS, GPRS or CDMA2000), the update request of source position server or target location server launch position server anchor point, in this update request, carry the mark (ID) of UE, trigger the location-based service anchor point of business network control unit renewal UE;
Step 2, business network control unit receives above-mentioned update request, sends the update request message in above-mentioned steps S601 to target location server.
In specific implementation process, in the update request in above-mentioned steps 2, can carry the address of objective network, business network control unit can, according to the address of this objective network, be determined target location server.In specific implementation process, can be in business network control unit the address of static configuration access network and the corresponding relation of location server, by this corresponding relation, business network control unit can be determined the location server corresponding with the address of objective network; Or business network control unit can be passed through nslookup server (Domain Name Server, referred to as the DNS) location server corresponding with the address of objective network.
Or, the address that can carry target location server in the update request in above-mentioned steps 2, business network control unit can directly be determined target location server according to this address.
In the embodiment of the present invention, target location server can comprise: LRF and GMLC, by the update request of target GMLC launch position server anchor point, the address of the target location server carrying in this request is the address of target LRF, the address of this target LRF can be in target GMLC static configuration, or LRF and GMLC are arranged on Same Physical entity.
(2) step S603
Target location server upgrades in the instruction that receives business network control unit transmission after the update request message of location-based service anchor point of UE, obtain the positional information of the renewal of this UE to objective network, and the positional information of obtaining is sent to business network control unit.
Particularly, target location server can be set up new session report for UE, and this session report is kept in the server of target location, wherein, in this session report, include but not limited to: the information such as the address of ID, target access network address and the Service Control Unit of UE, and be the new ESOK of this session report distribution, then initiate the position enquiring request of UE to target access network, target access network obtains the positional information of UE to wireless network, and positional information is returned to target location server.Then target location server is by the ID of UE, and the positional information after UE upgrades, new ESQK return to business network control unit in renewal response message.
Business network control unit is receiving after above-mentioned positional information, and upgrading the service position server anchor point of UE is target location server, and sends and cancel message to source position server, and the location-based service of instruction source of release provides location-based service shared resource for UE, simultaneously, business network control unit to another business network control unit (in existing IMS business network, can be PSAP) transmission location update message, indicate this business network control unit to upgrade the positional information of UE, and the address of above-mentioned new ESQK and target location server is carried in above-mentioned location update message, this business network control unit receives after this location update message, upgrade the positional information of UE and the address of target location server, in follow-up location query script, this business network control unit adopts target location server to carry out the location services such as position enquiring.
The above-mentioned location-based service supplying method providing according to the embodiment of the present invention, the location-based service anchor point that can be UE by target location server update, thus can ensure the continuity of UE location service in handoff procedure.
According to the embodiment of the present invention, another kind of location-based service supplying method is also provided, the method also for UE from source access network is switched to target access network for UE provides location-based service.
Fig. 7 is according to the flow chart of the location-based service supplying method of the embodiment of the present invention, as shown in Figure 7, mainly comprises (step S701-step S703) according to the location-based service supplying method of the embodiment of the present invention:
Step S701: source position server receives the position enquiring request from transmit leg, wherein, carries the mark of UE in this inquiry request;
In specific implementation process, receive between above-mentioned position enquiring request at source position server, source position server access network switch after, source access network sends updating message to source position server, in this updating message, carry the address of target location server (being target GMLC) and objective network, source position server can get the address of target location server (being target GMLC) and objective network from this updating message.
Step S703: source position server is according to the address of the target location server having obtained, and triggering target location server obtains the positional information of UE.
In the method, source position server is still as the location-based service anchor point of UE, source position server, can be according to the address of target location server in the time receiving the position enquiring request of transmit leg transmission, and triggering target location server obtains the positional information of UE.
In embodiments of the present invention, the positional information that server triggers target location, source position server obtains UE can have two kinds of implementations, below is introduced for these two kinds of modes respectively.
(1) mode one
Source position server, receiving after above-mentioned position enquiring request, according to the address of target location server, is transmitted to target location server by this position enquiring request, and indicating target location server obtains the positional information of UE.
Target location server is receiving after above-mentioned position enquiring request, according to the UE mark of carrying in this position enquiring request and the address of objective network, obtain the positional information of UE to objective network, and this positional information is returned to source position server, source position server receives after this positional information, and this positional information is returned to transmit leg.
(2) mode two
In which, source position server receives after above-mentioned position enquiring request, sends redirect message to transmit leg, wherein, carries the address of target location server and target access network in this redirect message; Transmit leg receives after above-mentioned redirect message, according to the address of target location server, send position enquiring request to target location server, in this position enquiring request, carry the mark of UE and the address of objective network, be used to indicate target location server and obtain the positional information of UE.
Target location server, receiving after above-mentioned position enquiring request, according to the mark of the address of objective network and UE, obtains the positional information of UE to objective network inquiry, then the positional information of obtaining is returned to transmit leg by target location server.
The above-mentioned location-based service supplying method providing according to the embodiment of the present invention, by source position server by position enquiring request forward to target location server, or notice transmit leg is redirected to target location server, can ensure the connectivity of the location-based service of UE.
For further understanding the specific implementation process of the technical scheme that the embodiment of the present invention provides, below business network be IMS service network, to carry out position enquiring by E-CSCF/PSAP be that example describes.
Embodiment mono-
In the present embodiment, adopt second method, i.e. the mode as agency by source position server, in the time that E-CSCF/PSAP carries out location service inquiry, position enquiring request is forwarded to target location server by source position server, realizes location service continuity.
Fig. 8 is the flow chart of the present embodiment, and as shown in Figure 8, source position server is realized the successional flow process of location service as agency and mainly comprised the following steps:
Step S801, UE carries out IMS emergent session at source access network (CS/EPS/GPRS/CDMA2000) with PSAP, in session is carried out, UE has moved to target access network (CS/EPS/GPRS/CDMA2000), now, UE sends out wireless measurement report to source access network, and source access network initiation session is switched, and IMS urgent call is switched to target access network by source access network.
And target access network is carried the address of target GMLC, target access network address to source access network in switching response message;
Step S802, source access network network element (MME/MSC etc.) is to source GMLC launch position report update request, carries the information such as IP address of UE id, target GMLC address and objective network in this position message update request.And source GMLC preserves target GMLC address as forward address.
Step S803, the positional information that E-CSCF/PSAP upgrades to source LRF inquiry UE by ESQK.
Step S804, source GMLC/LRF carries UE id in the query messages of position, and position enquiring message forwarding is arrived to target GMLC/LRF, to the positional information of target GMLC/LRF inquiry UE, and in query messages, carries destination network addresses;
Step S805, target GMLC inquires about to target access network, and target access network is obtained the renewal positional information of UE to wireless network, and the positional information that UE is upgraded returns to target GMLC/LRF.
Step S806, the positional information that target GMLC/LRF upgrades UE id, UE is carried at and in the response message of position, returns to source GMLC/LRF.
Step S807, the positional information that source LRF upgrades UE returns to E-CSCF/PSAP.
Embodiment bis-
Adopt in the present embodiment first method, the mode of carrying out location server renewal by target location server notification E-CSCF (being above-mentioned business network control unit), in the time that E-CSCF/PSAP carries out location service inquiry, directly adopt target location server to realize location service continuity.
Fig. 9 is the flow chart of the present embodiment, and as shown in Figure 9, the mode of target location server notification E-CSCF renewal location server realizes the successional flow process of location service and mainly comprises the following steps:
Step S901, UE carries out IMS emergent session at source access network (CS/EPS/GPRS/CDMA2000) with PSAP, in session is carried out, UE has moved to target access network (CS/EPS/GPRS/CDMA2000), now, UE sends out wireless measurement report to source access network, and source access network initiation session is switched, and IMS urgent call is switched to target access network by source access network.
Step S902, target access network network element (MME/MSC etc.) is to target GMLC launch position report request, and this position message request carries the information such as the IP address of UE ID, objective network.Wherein, target GMLC can be in target access network unit static configuration.
Step S903, target GMLC notification target LRF initiates to upgrade position server request to E-CSCF, carries the information such as IP address, target GMLC/LRF address of UE id, objective network in this notice.
The address of target LRF can be in target GMLC static configuration, or GMLC and LRF be a physical entity, both unifications.
Step S904, E-CSCF, to target LRF launch position server grappling update request, carries the information such as UE id, destination network addresses.
Step 505, target LRF is that UE sets up new session report, comprises UE id, destination network addresses, E-CSCF address etc., and distributes new ESQK for new session report and carry out correspondence.Then the positional information that notification target GMLC inquiry UE upgrades.
Step S906, target GMLC initiates the position enquiring request of UE to target access network, and target access network is obtained the renewal positional information of UE to wireless network, and the positional information that UE is upgraded returns to target GMLC/LRF.
Step S907, the positional information that target LRF upgrades UE id, UE, new ESQK upgrade in response message and return to E-CSCF in grappling, and the service position server anchor point that E-CSCF upgrades UE is target location server.
Step S908, E-CSCF sends and cancels message, the resource of source of release LRF/GMLC to source LRF/GMLC.
Step S909, parallel with step S908, E-CSCF sends location update message to PSAP, upgrade the positional information of UE, and the address of new ESQK and target LRF is carried to PSAP in message.
When carrying out follow-up location service, PSAP need adopt new ESQK to target LRF interaction locations service message.
Embodiment tri-
In the present embodiment, adopt first method, according to the mode of target access network address assignment target LRF, and adopt target LRF/GMLC to carry out position enquiring by E-CSCF (being business network control unit), realize location service continuity.
Figure 10 is the flow chart of the present embodiment, and as shown in figure 10, E-CSCF distributes target LRF according to destination network addresses, and realizes the successional flow process of location service and mainly comprise the following steps:
Step S101, UE carries out IMS emergent session at source access network (CS/EPS/GPRS/CDMA2000) with PSAP, in session is carried out, UE has moved to target access network (CS/EPS/GPRS/CDMA2000), now, UE sends out wireless measurement report to source access network, and source access network initiation session is switched, and IMS urgent call is switched to target access network by source access network.
Target access network in switching response message by the address of target GMLC, target access network address strap to source access network;
Step S102, source access network network element (MME/MSC etc.) is to source GMLC/LRF launch position report update request, and this position message update request carries the information such as IP address, target GMLC address of UE id, objective network.
Step S103, source GMLC notification source LRF, to the request of E-CSCF launch position server update, wherein, carries the information such as IP address, target GMLC address of UE id, objective network in notice.
Step S104, E-CSCF is according to the address assignment target LRF of target access network.The corresponding relation of access network address and LRF can be in E-CSCF static configuration, or inquires about by dns server.
Step S105, E-CSCF is to target LRF launch position server grappling update request, and this location server grappling update request carries the information such as UE id, destination network addresses, target GMLC address.
Target LRF can obtain target GMLC address according to target access network address, or in request message, gets target GMLC address, and in addition, target LRF also can configure with target GMLC unification.
Step S106, target LRF is that UE sets up new session report, comprises UE id, destination network addresses, E-CSCF address etc., and distributes new ESQK for new session report and carry out correspondence.Then the positional information that notification target GMLC inquiry UE upgrades.
Step S107, target GMLC initiates the position enquiring request of UE to target access network, and target access network is obtained the renewal positional information of UE to wireless network, and the positional information that UE is upgraded returns to target GMLC/LRF.
Step S108, the positional information that target GMLC/LRF upgrades UE id, UE, new ESQK upgrades in response message and returns to E-CSCF in grappling, and the service position server anchor point that E-CSCF upgrades UE is target location server
Step S109, E-CSCF sends and cancels message, the resource of source of release LRF/GMLC to source LRF/GMLC.
Step S110, parallel with step S109, E-CSCF sends location update message to PSAP, upgrade the positional information of UE, and the address of new ESQK and target LRF is carried to PSAP in message.
When carrying out follow-up location service, PSAP need adopt new ESQK to target LRF interaction locations service message.
Embodiment tetra-
The present embodiment adopts method two, is carried out redirected mode and triggered target location server and obtain the positional information of UE by source position server notification transmit leg.
In the present embodiment, transmit leg is E-CSCF/PSAP, in the time that E-CSCF/PSAP carries out location service inquiry to source position server, the address of target location server is returned to E-CSCF/PSAP by source position server, it is mutual that E-CSCF/PSAP and target location server carry out location service, realizes location service continuity.
Figure 11 is the flow chart of the present embodiment, and as shown in figure 11, position requests is redirected to destination server by source position server, realizes the successional flow process of location service and mainly comprises the following steps:
Step S111, UE carries out IMS emergent session at source access network (CS/EPS/GPRS/CDMA2000) with PSAP, in session is carried out, UE has moved to target access network (CS/EPS/GPRS/CDMA2000), now, UE sends out wireless measurement report to source access network, and source access network initiation session is switched, and IMS urgent call is switched to target access network by source access network.
Target access network in switching response message by the address of target GMLC/LRF, target access network address strap to source access network;
Step S112, source access network network element (MME/MSC etc.), to source GMLC launch position report update request, carries UE id, target GMLC address, the information such as the IP address of objective network in this position message update request.
Step S113, source GMLC is to target GMLC launch position report update request, carries the information such as IP address of UE id, objective network in this position message update request.
Step S114, target GMLC preserves the information such as the IP address of UE id, objective network, and upgrades response to the report of source GMLC home position, and this position message upgrades the address that carries target LRF in response.
Particularly, target LRF can be on target GMLC static configuration.
Step S115, the positional information that E-CSCF/PSAP upgrades to source LRF inquiry UE by ESQK.
Step S116, source GMLC/LRF, to E-CSCF/PSAP home position server redirection message, returns to E-CSCF/PSAP by message such as target LRF address, target GMLC address, UE id, and notice is inquired about to target LRF/GMLC launch position.
Step S117, the renewal position inquiry request that E-CSCF/PSAP initiates UE to target GMLC/LRF, carries the information such as UE id.
Step S118, target GMLC initiates the position enquiring request of UE to target access network, and target access network is obtained the renewal positional information of UE to wireless network, and the positional information that UE is upgraded returns to target GMLC/LRF.
Step S119, the positional information that target LRF upgrades UE returns to E-CSCF/PSAP in the response message of position.
Embodiment five
The present embodiment employing method one, by source network notice, E-CSCF carries out the renewal of location server anchor point, E-CSCF receives after location server update request, to be updated to target location server for the location server anchor point of UE service, in the time that E-CSCF/PSAP carries out location service inquiry, directly adopt target location server to realize location service continuity.
Compared with embodiment bis-, embodiment bis-, by objective network launch position server update, do not need source network to participate in, and embodiment five is by source network launch position server update.
Figure 12 is the flow chart of the present embodiment, and as shown in figure 12, the flow process that source position server is initiated destination server renewal mainly comprises the following steps:
Step S201, UE carries out IMS emergent session at source access network (CS/EPS/GPRS/CDMA2000) with PSAP, in session is carried out, UE has moved to target access network (CS/EPS/GPRS/CDMA2000), now, UE sends out wireless measurement report to source access network, and source access network initiation session is switched, and IMS urgent call is switched to target access network by source access network.
Target access network in switching response message by the address of target GMLC, target access network address strap to source access network;
Step S202, source access network network element (MME/MSC etc.), to source GMLC launch position report update request, carries UE id, target GMLC address, the information such as the IP address of objective network in this position message update request.
Step S203a, source GMLC is to target GMLC launch position report update request, carries the information such as IP address of UE id, objective network in this position message update request.
Step S203b, target GMLC preserves the information such as the IP address of UE id, objective network, and upgrades response to the report of source GMLC home position, and this position message upgrades the address that carries target LRF in response.
Target LRF can be on target GMLC static configuration.
Step S204a, source GMLC/LRF, to the request of E-CSCF launch position server update, carries the information such as the IP address of UE id, target GMLC/LRF address, objective network in this request.
Step S204b, or target GMLC/LRF, to the request of E-CSCF launch position server update, carries the information such as the IP address of UE id, target GMLC/LRF address, objective network in this request.
Step S205, E-CSCF, to target LRF launch position server grappling update request, carries the information such as UE id, destination network addresses in this request.
Step S206, target LRF is that UE sets up new session report, comprises UE id, destination network addresses, E-CSCF address etc., and distribute new ESQK for new session report and carry out correspondence in this session report.Then the positional information that notification target GMLC inquiry UE upgrades.
Step S207, target GMLC initiates the position enquiring request of UE to target access network, and target access network is obtained the renewal positional information of UE to wireless network, and the positional information that UE is upgraded returns to target GMLC/LRF.
Step S208, the positional information that target LRF upgrades UE id, UE, new ESQK upgrades in response message and returns to E-CSCF in grappling, and the service position server anchor point that E-CSCF upgrades UE is target location server.
Step S209, E-CSCF sends and cancels message, the resource of source of release LRF/GMLC to source LRF/GMLC.
Step S210, parallel with step S209, E-CSCF sends location update message to PSAP, upgrade the positional information of UE, and the address of new ESQK and target LRF is carried to PSAP in message.
When carrying out follow-up location service, PSAP need adopt new ESQK to target LRF interaction locations service message.
Although describe as an example of the network element in existing IMS business network example in the embodiment of the present invention, but be not limited to this, for other, IMS business network is improved or other business network, as long as the network element in these business networks has the function similar to network element in IMS business network in the embodiment of the present invention, for those skilled in the art, can obtain the technical scheme that the embodiment of the present invention provides directly beyond all doubtly.
As mentioned above, the technical scheme providing by the embodiment of the present invention, by the location-based service anchor point that is UE by target location server update, or, source position server is in the time receiving position enquiring request, position enquiring request is forwarded to target location server or the request of notice sending direction target location server transmission position enquiring, adopt target location server to realize location service, in the situation that source LRF and target LRF provide location-based service for zones of different, when UE is switched to the conversation procedure of target access network from source access network, ensure the continuity of UE location-based service, improving user experiences.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a location-based service supplying method, for user equipment (UE) from source access network is switched to target access network for UE provides location-based service, it is characterized in that, described method comprises:
Source position server receives the position enquiring request from transmit leg, wherein, carries the mark of UE in described inquiry request;
Described source position server is according to the address of target location server, triggers described target location server and obtain the positional information of described UE.
2. method according to claim 1, is characterized in that, before described source position server receives the described position enquiring request from described transmit leg, described method also comprises:
Described source position server receives the updating message that described source access network sends, and wherein, carries the address of described target location server, the address of target access network in described updating message.
3. method according to claim 2, is characterized in that, triggers the positional information that described target location server obtains described UE and comprises:
Described source position server is according to the address of described target location server, send described position enquiring request to described target location server, wherein, in described position enquiring request, carry the mark of described UE and the address of objective network, be used to indicate described target location server and obtain described positional information.
4. method according to claim 3, is characterized in that, at described source position server, after described target location server sends described position enquiring request, described method also comprises:
Described target location server receives described position enquiring request, and according to the address of the mark of described UE and target access network, obtain the positional information of described UE to target access network, and described positional information is returned to described transmit leg via described source position server.
5. method according to claim 2, is characterized in that, triggers the positional information that described target location server obtains described UE and comprises:
Described source position server sends redirect message to described transmit leg, wherein, carries the address of described target location server and described target access network in described redirect message;
Described transmit leg is according to the address of described target location server, send position enquiring request to described target location server, wherein, in described position enquiring request, carry the address of mark and the target access network of described UE, be used to indicate described target location server and obtain described positional information.
6. method according to claim 5, is characterized in that, after target location server described in described sending direction sends described position enquiring request, described method also comprises:
Described target location server receives described position enquiring request, and according to the mark of the address of described target access network and described UE, obtains the positional information of described UE to described target access network inquiry;
The described positional information of obtaining is returned to described transmit leg by described target location server.
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