CN101854583B - Location-based service provide method - Google Patents
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Abstract
The invention provides a location-based service provide method, which is used for providing a location-based service for UE after the UE is switched to a target access network from a source access network. The method comprises the following steps: a target location-based server receives an update request message sent by a first business network control unit, wherein the update request message carries a UE identification; the UE identification is used for indicating the target location-based server to update a UE location-based service anchor point; and the target location-based server is used as the UE location-based anchor point and for providing the location-based service for UE. By the invention, the continuity of UE location-based service the position service of the UE can be ensured when the UE is in the conversation process of switching to the target access network from the source access network.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate 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 PartnershipProject, referred to as 3GPP) tissue propose the IP-based network architecture of one, it constructs an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for user.
IMS is IP-based communication network framework, have nothing to do 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 Systemfor 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 mobile terminal is in the region that mobile network covers, even if the subscriber identification module of insertion (Subscriber Identity Module, referred to as SIM) or be provided with restriction exhalation, all can initiate urgent call by dialing emergency numbers (such as, 110,119,911 etc.); Urgent call can be transferred to corresponding urgency communication and accept center (Public Safety Answering Point, referred to as PSAP), such as, police office, fire brigade, first-aid centre etc., by EC for user provides the emergency assistance services of 24 hours.The operation of whole emergencycallboxsystem is completed by emergency services collaborate 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 usual IMS domain provides can 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 ControlFunction, referred to as P-CSCF), service call conversation control function (Serving CallSession Control Function, referred to as S-CSCF), home subscriber server (HomeSubscriber Server, referred to as HSS), emergency call session controlling functions (EmergencyCall 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 be used for as agency forwarding UE and S-CSCF between request and response.S-CSCF is the home service entity of UE, for providing the function such as service logic and control of authority for UE.HSS is for the information such as business of the register information and customization of preserving user.LRF is used for the positional information providing active user 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, propose Long Term Evolution (Long-Term Evolution, referred to as LTE)/System Architecture Evolution (System Architecture Evolution, referred to as SAE) framework theory of future generation, the transmission rate that this framework can make the wireless communication system of evolution provide higher, shorter transmission delay and lower cost, also support the mobility between 3GPP inter Access System simultaneously, and the mobility etc. between 3GPP connecting system and non-3 GPP access system.In addition, LTE/SAE also using the one access means as IMS domain, supports the successional function of original voice conversation.Fig. 1 is the Organization Chart adopting LTE/SAE access architecture to realize 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, can provide higher up-downgoing speed, 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.), for user distributes temporary mark, be responsible for when UE quarters at this tracing area or this network carrying out authentication to this user.
SAE gateway (SAE Gateway, referred to as SAE GW) be user plane functions entity, be responsible for user face data route processing, serving SAE gateway (Serving SAEGW can be divided into, 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 the mobile anchor point between E-UTRAN.PDN GW termination is in the downlink data of the UE of idle state, when the downlink data mailing to UE arrives, 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 needs the ability with 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 RequireFunction, position requests function), it is a logical functional entity, be defined in IMS urgent call framework, for providing the position of user for E-CSCF, and based on the suitable PSAP of this location lookup; Gateway Mobile Location Center (Gateway Mobile LocationCenter, referred to as GMLC), for providing subscriber location function in the core network.Usually, LRF function belongs to a part of GMLC.
After UE is linked into source access network, by source access network, if CS network or EPS network insertion are to IMS system.When UE carries out IMS emergent session business at source access network, UE is moved to target access network simultaneously, as CS network or EPS network, during switching between access networks, both need to ensure the emergent session continuity of IMS emergent session speech business in source access network and target access network, also need the location service continuity of guarantee source access network and target access network.
At present, in order to ensure the successional architectural solution of location service as shown in Figure 2.When UE is by source access network (CS network, EPS network, GPRS network etc.) when carrying out IMS urgent call, UE carries the E-CSCF network element of positional information to IMS network of UE in session request, E-CSCF is to LRF verification or the positional information of inquiring about UE, LRF for this emergent session set up session report, by the positional information of UE, access network address, source, UE mark etc. 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, thus PSAP and UE sets up IMS emergent session.In emergent session process, if UE moves, PSAP can carry out the renewal position enquiring of UE by LRF.
When UE moves to target access network, such as CS network, EPS network, GPRS network etc., now UE needs emergent session to be switched to target access network, and needs the switching of emergency location business.When UE is switched to target access network, LRF needs the GMLC determined in target access network, and location service request is issued target GMLC, thus the continuity realizing location service switches.
In the successional architectural solution of existing location service, a kind of flow process ensureing 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 is moved to target access network (CS/EPS/GPRS/CDMA2000), UE sends out wireless measurement report to source access network, source access network initiation session switches, and IMS urgent call is switched to target access network by source access network.
Step S302, target access network network element (MME/MSC etc.), to target GMLC launch position report request, carry 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 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 in position enquiring address.Then initiate to cancel message to source GMLC, be released in the resource of source GMLC.
Step S305, PSAP can inquire about the positional information of UE renewal to LRF 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 UE upgrades is returned to target GMLC by target access network.
The positional information that UE upgrades is returned to LRF by step S308, target GMLC.
The positional information that UE upgrades is returned to PSAP by step S309, LRF.
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.
The information such as IP address of UE id, objective network, to source GMLC launch position report update request, is carried in step S402, source access network network element (MME/MSC etc.).
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 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 access network address assignment target GMLC, then target GMLC are pointed in position enquiring address.
Step S405, LRF initiate to cancel message to source GMLC, are released in the resource of source GMLC.
Step S406, PSAP can inquire about the positional information of UE renewal to LRF 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 UE upgrades is returned to target GMLC by target access network.
The positional information that UE upgrades is returned to LRF by step S409, target GMLC.
The positional information that UE upgrades is returned to PSAP by step S410, LRF.
Above-mentioned two kinds ensure that the successional architectural of location service and method are the scenes belonging 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 lists (GMLC list), i.e. source LRF managed source GMLC list, target LRF management objectives GMLC list; Or the functional unification of GMLC/LRF, permeate a zonal location server.In such a scenario, after UE moves to 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, conventionally realize the successional method of location service of user, because source LRF and target GMLC is without any interface, therefore, the continuity of location service cannot be realized, cause position service disruption in conversation procedure.
Summary of the invention
In view of this, the invention provides a kind of location-based service supplying method of improvement, in order to solve when source LRF and target LRF provides location-based service for zones of different, UE is switched to the conversation procedure of target access network the problem that location-based service may be caused to interrupt from source access network.
According to an aspect of the present invention, provide a kind of location-based service supplying method, for UE provides location-based service after the method is switched to target access network for UE from source access network.
Location-based service supplying method according to the present invention comprises: target location server receives the update request message that the first business network control unit sends, wherein, carry the mark of UE in this update request message, being used to indicate target location server update is the location-based service anchor point of UE; Location-based service is provided as the position anchor point of UE and for UE using target location server.
According to another aspect of the present invention, provide another kind of location-based service supplying method, for UE provides location-based service after the method is also switched to target access network for UE from source access network.
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 trigger target location server obtains the positional information of UE.
By at least one scheme above-mentioned of the present invention, by by target location server update being the location-based service anchor point of UE, or, source position server is when 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, target location server is adopted to realize location service, when source LRF and target LRF provides location-based service for zones of different, when UE is switched to the conversation procedure of target access network from source access network, ensure that 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 become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 adopts LTE/SAE access architecture to realize the Organization Chart of IMS urgent call in prior art;
Fig. 2 ensures the successional architectural schematic diagram of location service in prior art;
Fig. 3 is the successional method flow diagram of a kind of guarantee location service in prior art;
Fig. 4 is the successional method flow diagram of another kind of guarantee location service in prior art;
Fig. 5 be embodiment of the present invention UE conversate from source access network to target access network switch schematic diagram;
Fig. 6 is the flow chart of a kind of location-based service supplying method according to the embodiment of the present invention;
Fig. 7 is the flow chart of the another kind of location-based service supplying method according to the embodiment of the present invention;
Fig. 8 is the flow chart of embodiment one;
Fig. 9 is the flow chart of embodiment two;
Figure 10 is the flow chart of embodiment three;
Figure 11 is the flow chart of embodiment four;
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 lists (GMLC list), i.e. source LRF managed source GMLC list, target LRF management objectives GMLC list; Or the functional unification of GMLC/LRF, permeate a zonal location server.As shown in Figure 5, after UE moves to 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, have employed two kinds of location-based service supplying methods, wherein, in first method, business network control unit is when the instruction receiving source position server or the transmission of target location server upgrades the request message of location server, update request message is sent to target location server, target location server update is the location-based service anchor point of UE by request, provides location-based service for UE using target location server as the position anchor point of 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 when receiving the position enquiring request that transmit leg sends, 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, thus trigger 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 functional entity that E-CSCF one of introducing as IMS domain is new, itself and P-CSCF are arranged in same network (being the visited network of user when a user roams), be responsible for the emergent session received from P-CSCF and set up request, the positional information provided according to user or from LRF obtain positional information and routing iinformation, the emergent session request of setting up is routed to through Mm the urgency communication being connected to IP network and accepts center (PSAP), or through Mi/Mg interface route to being connected to PSTN (Public Switch Telephone Network, be called for short PSTN) urgency communication accept center.Meanwhile, urgency communication accepts center directly can obtain customer position information by Le interface from LRF, and is contacted by Mm/Mw interface and home network, with callback user.
When not conflicting, the embodiment in the application and the feature in embodiment 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 is only for instruction and explanation of the present invention, is not intended to limit the present invention.
According to the embodiment of the present invention, provide firstly a kind of location-based service supplying method, for UE provides location-based service after being switched to target access network for UE from source access network.
Fig. 6 is the flow chart of the location-based service supplying method according to 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, being used to indicate target location server update is the location-based service anchor point of UE;
Step S603: provide location-based service as the position anchor point of UE and for UE using target location server.
In existing IMS business network, above-mentioned business network control unit can be E-CSCF.
Below further describe the details of above-mentioned each process.
(1) step S601
In specific implementation process, the process 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, carry the mark (ID) of UE in this update request, trigger business network control unit upgrades the location-based service anchor point of 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, can carry the address of objective network in the update request in above-mentioned steps 2, then business network control unit according to the address of this objective network, can determine target location server.In specific implementation process, can 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 determine the location server corresponding with the address of objective network; Or business network control unit can pass through nslookup server (DomainName Server, referred to as the DNS) location server corresponding with the address of objective network.
Or can carry the address of target location server in the update request in above-mentioned steps 2, business network control unit can directly determine 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 carried in this request is the address of target LRF, the address of this target LRF can in target GMLC static configuration, or LRF and GMLC is arranged on Same Physical entity.
(2) step S603
Target location server is after the update request message of location-based service anchor point receiving the instruction renewal UE that business network control unit sends, obtain the positional information of the renewal of this UE to objective network, and the positional information of acquisition is sent to business network control unit.
Particularly, target location server can set up new session report for UE, and this session report is kept in the server of target location, wherein, include but not limited in this session report: the information such as the address of the ID of UE, target access network address and Service Control Unit, and distribute new ESOK for this session report, then the position enquiring request of UE is initiated 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 the positional information after the ID of UE, UE renewal, new ESQK are returned to business network control unit by target location server in renewal response message.
Business network control unit is after receiving above-mentioned positional information, and upgrading the service position server anchor point of UE is target location server, and sends to source position server and cancel message, and the location-based service of instruction source of release provides the resource shared by location-based service for UE, simultaneously, business network control unit to another business network control unit (in existing IMS business network, can be PSAP) send location update message, this business network control unit is indicated 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, after this business network control unit receives 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.
According to the above-mentioned location-based service supplying method that the embodiment of the present invention provides, can be the location-based service anchor point of UE by target location server update, thus the continuity of UE location service in handoff procedure can be ensured.
According to the embodiment of the present invention, additionally provide another kind of location-based service supplying method, for UE provides location-based service after the method is also switched to target access network for UE from source access network.
Fig. 7 is the flow chart of the location-based service supplying method according to 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, at source position server after access network switches, source access network sends updating message to source position server, carry the address of target location server (i.e. target GMLC) and objective network in this updating message, source position server can get the address of target location server (i.e. target GMLC) and objective network from this updating message.
Step S703: source position server is according to the address of the target location server obtained, and trigger 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 according to the address of target location server when receiving the position enquiring request that transmit leg sends, and trigger 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, is introduced respectively below for these two kinds of modes.
(1) mode one
Source position server is after receiving above-mentioned position enquiring request, and according to the address of target location server, by this position enquiring request forward to target location server, indicating target location server obtains the positional information of UE.
Target location server is after receiving above-mentioned position enquiring request, according to the UE mark of carrying in this position enquiring request and the address of objective network, the positional information of UE is obtained to objective network, and this positional information is returned to source position server, after source position server receives this positional information, this positional information is returned to transmit leg.
(2) mode two
In this approach, after source position server receives above-mentioned position enquiring request, send redirect message to transmit leg, wherein, in this redirect message, carry the address of target location server and target access network; After transmit leg receives 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 the positional information that target location server obtains UE.
Target location server is after the above-mentioned position enquiring request of reception, and according to the address of objective network and the mark of UE, obtain the positional information of UE to objective network inquiry, then the positional information of acquisition is returned to transmit leg by target location server.
According to the above-mentioned location-based service supplying method that the embodiment of the present invention provides, 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 understanding the specific implementation process of the technical scheme that the embodiment of the present invention provides further, following business network is IMS service network, carried out position enquiring by E-CSCF/PSAP is that example is described.
Embodiment one
Adopt second method in the present embodiment, namely by the mode of source position server as agency, when 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 realizes the successional flow process of location service as agency and mainly comprises 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 is 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 switches, and IMS urgent call is switched to target access network by source access network.
Further, the address of target GMLC, target access network address are carried to source access network by target access network in switching response message;
Step S802, source access network network element (MME/MSC etc.), 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.Further, source GMLC preserves target GMLC address as forward address.
Step S803, E-CSCF/PSAP inquire about the positional information of UE renewal to source LRF by ESQK.
Step S804, source GMLC/LRF carries UE id in the query messages of position, and by position enquiring message forwarding to target GMLC/LRF, inquires about the positional information of UE, and carry destination network addresses to target GMLC/LRF in query messages;
Step S805, target GMLC inquires about to target access network, and target access network obtains the renewal positional information of UE to wireless network, and the positional information that UE upgrades is returned to target GMLC/LRF.
The positional information that UE id, UE upgrade is carried in the response message of position and returns to source GMLC/LRF by step S806, target GMLC/LRF.
Step S807, the positional information that UE upgrades is returned to E-CSCF/PSAP by source LRF.
Embodiment two
Adopt first method in the present embodiment, notify that E-CSCF (namely above-mentioned business network control unit) carries out the mode of location server renewal by target location server, when E-CSCF/PSAP carries out location service inquiry, target location server is directly adopted 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 notice 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 is 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 switches, 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 IP address of UE ID, objective network.Wherein, target GMLC can 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 in target GMLC static configuration, or GMLC and LRF is a physical entity, both unifications.
Step S904, E-CSCF, to target LRF launch position server grappling update request, carry 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 carries out correspondence for new session report distributes new ESQK.Then notification target GMLC inquires about the positional information that UE upgrades.
Step S906, target GMLC initiate the position enquiring request of UE to target access network, and target access network obtains the renewal positional information of UE to wireless network, and the positional information that UE upgrades is returned to target GMLC/LRF.
The positional information that UE id, UE upgrade by step S907, target LRF, new ESQK upgrade in response message in grappling and return to E-CSCF, and the service position server anchor point that E-CSCF upgrades UE is target location server.
Step S908, E-CSCF send to source LRF/GMLC and cancel message, the resource of source of release 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 the message.
PSAP need adopt new ESQK to target LRF interaction locations service message when carrying out follow-up location service.
Embodiment three
Adopt first method in the present embodiment, by E-CSCF (i.e. business network control unit) according to the mode of target access network address assignment target LRF, and adopt target LRF/GMLC to carry out position enquiring, 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 is 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 switches, 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, carry the information such as IP address, target GMLC address of UE id, objective network in notice.
Step S104, E-CSCF are according to the address assignment target LRF of target access network.The corresponding relation of access network address and LRF in E-CSCF static configuration, or can be inquired about by dns server.
Step S105, E-CSCF are 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, get target GMLC address, and in addition, target LRF also can unify with target GMLC and configures.
Step S106, target LRF are that UE sets up new session report, comprise UE id, destination network addresses, E-CSCF address etc., and carry out correspondence for new session report distributes new ESQK.Then notification target GMLC inquires about the positional information that UE upgrades.
Step S107, target GMLC initiate the position enquiring request of UE to target access network, and target access network obtains the renewal positional information of UE to wireless network, and the positional information that UE upgrades is returned to target GMLC/LRF.
The positional information that UE id, UE upgrade by step S108, target GMLC/LRF, new ESQK upgrades in response message in grappling and returns to E-CSCF, and the service position server anchor point that E-CSCF upgrades UE is target location server
Step S109, E-CSCF send to source LRF/GMLC and cancel message, the resource of source of release 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 the message.
PSAP need adopt new ESQK to target LRF interaction locations service message when carrying out follow-up location service.
Embodiment four
The present embodiment adopts method two, is notified the positional information of the mode trigger target location server acquisition UE that transmit leg carries out being redirected by source position server.
In the present embodiment, transmit leg is E-CSCF/PSAP, when E-CSCF/PSAP carries out location service inquiry to source position server, the address of target location server is returned 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 is 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 switches, 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, to target GMLC launch position report update request, carry the information such as IP address of UE id, objective network in this position message update request.
The information such as the IP address of step S114, target GMLC preservation UE id, objective network, and upgrade response to the report of source GMLC home position, this position message carries the address of target LRF in upgrading and responding.
Particularly, target LRF can on target GMLC static configuration.
Step S115, E-CSCF/PSAP inquire about the positional information of UE renewal to source LRF by ESQK.
The message such as target LRF address, target GMLC address, UE id, to E-CSCF/PSAP home position server redirection message, are returned to E-CSCF/PSAP, notify to inquire about to target LRF/GMLC launch position by step S116, source GMLC/LRF.
Step S117, E-CSCF/PSAP initiate the renewal position inquiry request of UE to target GMLC/LRF, carry the information such as UE id.
Step S118, target GMLC initiate the position enquiring request of UE to target access network, and target access network obtains the renewal positional information of UE to wireless network, and the positional information that UE upgrades is returned to target GMLC/LRF.
The positional information that UE upgrades by step S119, target LRF returns to E-CSCF/PSAP in the response message of position.
Embodiment five
The present embodiment employing method one, notify that E-CSCF carries out the renewal of location server anchor point by source network, after E-CSCF receives location server update request, the location server anchor point of serving for UE is updated to target location server, when E-CSCF/PSAP carries out location service inquiry, target location server is directly adopted to realize location service continuity.
Compared with embodiment two, embodiment two, 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 initiates 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 is 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 switches, 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, to target GMLC launch position report update request, carry the information such as IP address of UE id, objective network in this position message update request.
The information such as the IP address of step S203b, target GMLC preservation UE id, objective network, and upgrade response to the report of source GMLC home position, this position message carries the address of target LRF in upgrading and responding.
Target LRF can on target GMLC static configuration.
Step S204a, source GMLC/LRF, to the request of E-CSCF launch position server update, carry the information such as 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 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, carry the information such as UE id, destination network addresses in this request.
Step S206, target LRF are that UE sets up new session report, comprise UE id, destination network addresses, E-CSCF address etc., and carry out correspondence for new session report distributes new ESQK in this session report.Then notification target GMLC inquires about the positional information that UE upgrades.
Step S207, target GMLC initiate the position enquiring request of UE to target access network, and target access network obtains the renewal positional information of UE to wireless network, and the positional information that UE upgrades is returned to target GMLC/LRF.
The positional information that UE id, UE upgrade by step S208, target LRF, new ESQK upgrades in response message in grappling and returns to E-CSCF, and the service position server anchor point that E-CSCF upgrades UE is target location server.
Step S209, E-CSCF send to source LRF/GMLC and cancel message, the resource of source of release 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 the message.
PSAP need adopt new ESQK to target LRF interaction locations service message when carrying out follow-up location service.
Although be described for the network element in existing IMS business network in the embodiment of the present invention, but be not limited to this, other is improved or other business network IMS business network, as long as the network element in these business networks has the function similar to the network element in the IMS business network in the embodiment of the present invention, for those skilled in the art, directly unambiguously the technical scheme that the embodiment of the present invention provides can be obtained.
As mentioned above, by the technical scheme that the embodiment of the present invention provides, by by target location server update being the location-based service anchor point of UE, or, source position server is when 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, target location server is adopted to realize location service, when source LRF and target LRF provides location-based service for zones of different, when UE is switched to the conversation procedure of target access network from source access network, ensure that the continuity of UE location-based service, improve Consumer's Experience.
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 done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a location-based service supplying method, for UE provides location-based service after being switched to target access network for user equipment (UE) from source access network, it is characterized in that, described method comprises:
Target location server receives the update request message that the first business network control unit sends, and wherein, carries the mark of UE in described update request message, and being used to indicate described target location server update is the location-based service anchor point of described UE;
Location-based service is provided as the position anchor point of described UE and for described UE using described target location server;
Wherein, described first business network control unit is E-CSCF or PSAP; The source position server of described source access network is connected with the described target location server of described target access network by described E-CSCF or described PSAP, and described source position server is source GMLC/LRF, and described target location server is target GMLC/LRF.
2. method according to claim 1, is characterized in that, before described target location server receives described update request message, described method also comprises:
Described first business network control unit receives the request message that instruction upgrades location server, wherein, carries the mark of described UE in described request message;
Described first business network control unit sends described update request message to described target location server.
3. method according to claim 2, is characterized in that, also carries target access network address and/or target location server address in described update request;
Before sending described update request message to described target location server, described method also comprises:
Described first business network control unit, according to described target access network address and/or described target location server address, determines described target location server.
4. according to the method in claim 2 or 3, it is characterized in that, before described first business network control unit receives described request message, described method also comprises:
Source position server or target location server send described request message to described first business network control unit.
5. method according to claim 1, is characterized in that, after receiving described update request message, described method also comprises:
Described target location server obtains the positional information of described UE to target access network, and the described positional information obtained is sent to described first business network control unit.
6. method according to claim 5, is characterized in that, after described positional information is sent to described first business network control unit, described method also comprises:
Described first business network receives described positional information, and discharging described source position server for described UE provides resource shared by location-based service.
7. method according to claim 6, is characterized in that, after described first business network receives described positional information, described method also comprises:
Described first business network control unit sends location update message to the second business network control unit, wherein, carries the described positional information of described UE and the address of described target location server in described location update message;
Described second business network control unit, according to the described positional information of carrying in described location update message and described address, upgrades the positional information of described UE and the address of target location server.
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