CN101997827B - Method, device and network for providing position related service - Google Patents

Abstract

The invention provides a method, a device and a network for providing position related service, applied to providing an LDS (Local Dependent Service) for UE (User Equipment) in an IMS (IP Multimedia Subsystem). In the invention, an entity based on a location awareness service selection function (LaSSF) is added in the traditional IMS framework, the LaSSF selects AS providing the LDS for the UE and a CSCF (Call Session Control Function) entity transfers the LDS request of the UE to the corresponding AS so as to establish the LDS conversation between the UE and the AS. The invention ensures that the LDS is selected and provided in the IMS network and improves the use experience of the user to the LDS service.

Description

A method, device and network for providing location-related services

technical field

The present invention relates to the technical field of Internet Protocol Multimedia Subsystem (IMS, IP Multimedia Subsystem), in particular to a method, device and network for providing location-related services in an IMS network.

Background technique

The IMS specified by the 3rd Generation Partnership Project (3GPP) is proposed to support multimedia sessions and other services based on the Session Initiation Protocol (SIP, Session Initiation Protocol) in the 3G core network. Communication and Internet technologies are organically combined to provide users with a next-generation communication network with carrier-class quality of service (QoS) guarantees and comprehensive services. Its main feature is that it adopts the SIP protocol and is independent of access and bearer technologies.

The 3GPP 23.271 standard defines two different types of services based on the correlation between services and locations. Among them, one is the location-dependent service (LDS, Location Dependent Service), that is, when the user equipment (UE, User Equipment) enters a certain area, the service provided by the operator or the third-party service provider does not require the UE to pre-order, such as this Public photocopying business in the region or discount business in shopping malls. LDS can be provided to users in two ways, that is, Pull (Pull) (the network returns corresponding information to user requests, such as finding the nearest restaurant) and Push (Push) (the user receives information from the network without actively requesting it, such as broadcasting information from nearby restaurants). The other is Location Independent Service (LIS, Location Independent Service), which is a service that operators or third-party service providers can provide anywhere the network can cover. LIS adopts the Pull method to provide services to users, and the service is activated through user request or other users have activated the service, so the user must subscribe to the service in advance. The LIS includes any location-independent services, such as Multimedia Messaging Service (MMS, Multimedia Messaging Service).

The existing 3GPP standard does not formulate the implementation scheme of LDS in the IMS network. Since the LDS does not require users to subscribe, the existing IMS service trigger mechanism cannot realize the discovery and trigger of the LDS, thus greatly limiting the user's experience and use of the LDS service.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method, device and network for providing location-related services in an IMS network, which realizes the selection and provision of LDS in the IMS network, and improves the user experience of LDS services.

In order to solve the problems of the technologies described above, the present invention provides the following solutions:

A method for providing location-related services in an Internet Protocol Multimedia Subsystem (IMS) network, comprising:

Step A, the call session control function entity CSCF receives the LDS request sent by the user equipment UE for starting the location-related service LDS session, and the LDS request includes the LDS service type requested by the UE and UE context information;

Step B, the CSCF parses the LDS request, acquires the LDS service type and UE context information requested by the UE, and sends the LDS service type and UE context information requested by the UE to the location-based service selection function entity LaSSF;

Step C, the LaSSF selects the AS that provides the corresponding service for the UE from the ASs in the local network according to the LDS service type requested by the UE, the UE context information, and the application server AS information in the local network, and sends the selected AS The routing information of the AS is returned to the CSCF, and step D is entered;

Step D, the CSCF forwards the LDS request to the selected AS according to the routing information of the selected AS returned by the LaSSF;

Step E, the selected AS establishes an LDS session with the UE according to the LDS request.

Preferably, in the above method, the LaSSF further saves the application server AS information in the local network by itself, and in the step C, in the step C, the LaSSF further according to the LDS service type requested by the UE, the UE context information and the AS information in the local network saved by itself, and select the AS that provides corresponding services for the UE from the ASs in the local network.

Preferably, in the step C, if the LaSSF does not select an AS that provides corresponding services for the UE according to the LDS service type requested by the UE, the UE context information, and the AS information of the local network saved by itself, the method Also includes:

Step F, LaSSF sends a search request for searching AS in the local network to the local network through the CSCF, and updates the AS information of the local network saved by itself according to the response message returned by the AS in the local network for the search request , and return to step C.

Preferably, in the above method, the LaSSF further stores the historical information of the UE, and the historical information of the UE stores the AS information selected by the LaSSF to provide LDS for the UE;

In the step C, the LaSSF further selects an AS from the local network to provide the corresponding service for the UE according to the history information of the UE, the LDS service type requested by the UE, the UE context information, and the AS information of the local network. AS, and update the history information of the UE according to the information of the selected AS.

Preferably, in the above method, the CSCF is a proxy call session control function entity P-CSCF or a serving call session control function entity S-CSCF;

The UE context information includes: the current location information of the UE, the IP address of the UE, and the domain name of the home domain of the UE.

The present invention also provides a location-aware service selection function entity LaSSF in the Internet Protocol Multimedia Subsystem IMS network, the LaSSF is connected with the call session control function entity CSCF, and the LaSSF includes:

The receiving unit is configured to receive the LDS service type and UE context information requested by the user equipment UE sent by the CSCF, and the LDS service type and UE context information are the analysis of the LDS request sent by the CSCF to the UE for starting an LDS session later obtained;

The AS selection unit is configured to select the AS that provides the corresponding service for the UE from the ASs in the local network according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network, and select the selected AS The routing information is returned to the CSCF.

Preferably, in above-mentioned LaSSF, also include:

The application server AS information storage unit is used to save the AS information in the local network;

The AS selection unit is further configured to select from the ASs in the local network to provide the UE with the AS information according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network stored by the AS information storage unit. The AS of the corresponding service.

Preferably, in above-mentioned LaSSF, also include:

The AS discovery unit is configured to send a search request for searching an AS in the local network to the local network through the CSCF when the AS selection unit of the application server does not select an AS that provides corresponding services for the UE, and according to The AS in the local network updates the AS information in the local network stored by the AS information storage unit of the application server in response to the response message returned by the search request, and triggers the AS selection unit to select an AS that provides the corresponding service for the UE again. AS.

Preferably, in above-mentioned LaSSF, also include:

a UE historical information storage unit, configured to save the historical information of the UE, where the historical information of the UE contains the AS information selected by the LaSSF to provide LDS for the UE;

The AS selection unit is further configured to select an AS that provides corresponding services for the UE from ASs in the local network according to the historical information of the UE, the LDS service type requested by the UE, the UE context information, and the AS information of the local network , and update the historical information of the UE stored in the UE historical information storage unit according to the information of the selected AS.

Preferably, the CSCF is a proxy call session control function entity P-CSCF or a serving call session control function entity S-CSCF; the UE context information includes: UE current location information, UE IP address and domain name of UE home domain.

The present invention also provides an Internet protocol multimedia subsystem IMS network, including a call session control function entity CSCF, an application server AS and a location-aware service selection function entity LaSSF, and the LaSSF is connected to the CSCF; wherein,

The CSCF is configured to receive an LDS request sent by a user equipment UE for starting a location-related service LDS session, the LDS request includes the LDS service type requested by the UE and UE context information; parse the LDS request, and obtain UE The requested LDS service type and UE context information, and send the service type and UE context information requested by the UE to the LaSSF; and receive the routing information of the AS that provides the corresponding service for the UE returned by the LaSSF, and send The LDS request is forwarded to the AS that provides corresponding services for the UE;

The LaSSF is configured to receive the LDS service type and UE context information requested by the UE sent by the CSCF, and select from the AS in the local network according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network Find the AS that provides the corresponding service for the UE, and return the routing information of the AS that provides the corresponding service for the UE to the CSCF;

The AS is configured to receive and respond to the LDS request from the UE forwarded by the CSCF, and establish an LDS session with the UE.

Preferably, in the above IMS network,

The LaSSF is also used to save the AS information of the application server in the local network by itself, and select the AS information from the AS in the local network according to the LDS service type requested by the UE, the UE context information and the AS information of the local network saved by itself. An AS that provides corresponding services for the UE.

Preferably, in the above-mentioned IMS network, the LaSSF is further configured to send a search request for searching an AS in the local network to the local network through the CSCF when no AS providing corresponding services for the UE is selected, And update the AS information of the local network saved by itself according to the response message returned by the AS in the local network to the search request; then, select the AS that provides the corresponding service for the UE again.

Preferably, in the above IMS network,

The LaSSF is also used to store the historical information of the UE, the historical information of the UE stores the AS information selected by the LaSSF to provide LDS for the UE, and further according to the historical information of the UE, the UE According to the requested LDS service type, UE context information and AS information of the local network, select the AS that provides corresponding services for the UE from the ASs of the local network, and update the historical information of the UE according to the information of the selected AS.

Preferably, in the above IMS network,

The CSCF is a proxy call session control function entity P-CSCF or a serving call session control function entity S-CSCF;

The UE context information includes: the current location information of the UE, the IP address of the UE, and the domain name of the home domain of the UE.

It can be seen from the above that the method, device and network for providing location-related services in the IMS network provided by the present invention add a location-based service selection function entity (LaSSF) to the existing IMS architecture, and the LaSSF serves as the UE The AS that provides LDS is selected, and the CSCF forwards the UE's LDS request to the corresponding AS, thereby establishing an LDS session between the UE and the AS, and realizing the provision of LDS services. Moreover, when the LaSSF does not find a suitable AS for the initial selection, the present invention further obtains and updates the AS information in the local network by initiating an AS search in the local network, and selects a suitable AS for the UE again according to the updated AS information, To satisfy the UE's LDS session request as much as possible. Finally, the present invention further selects an AS for the UE according to the historical information of the UE by saving the historical information of the UE, so that the selected AS is more in line with the requirements of the UE.

Description of drawings

FIG. 1 is a schematic diagram of an application environment of a method for providing a location-related service according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a method for providing a location-related service according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of the LaSSF described in the embodiment of the present invention.

Detailed ways

The invention provides a method for providing location-related services in an IMS network, and proposes to realize the provision of LDS, so that the IMS network can flexibly discover, select and provide local LDS services. The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

As shown in FIG. 1, this embodiment adds a new functional entity in the existing IMS network: location-aware service selection function entity (LaSSF, Location-aware Service Selection Function). LaSSF is connected with call session control function entity (CSCF, Call Session Control Function) through the Cs interface customized in this embodiment, and this CSCF (indicated by X-CSCF in Fig. 1) can specifically be to carry out business in existing IMS network Session control functional entities, such as Proxy-Call Session Control Function (P-CSCF, Proxy-Call Session Control Function) or Serving-Call Session Control Function (S-CSCF, Serving-Call Session Control Function). In Figure 1, the UE is connected to the X-CSCF through the Gm interface, and the X-CSCF is connected to the Application Server (AS, Application Server) in the local network through the ISC (Internal Service Control) interface. The UE can be connected to the AS through the Ut interface. Figure 1 only schematically shows one AS, and the local network where the X-CSCF is located may include multiple ASs.

In this embodiment, LaSSF realizes functions such as collection, management and selection of ASs in the local network under the existing IMS architecture, and LaSSF stores AS information in the local network itself, specifically including routing information of ASs and information provided by ASs. LDS business type information, etc. The LaSSF itself does not have a session control function, and it exchanges messages with the X-CSCF through the Cs interface. In this embodiment, the LaSSF and the X-CSCF are located in the same network, for example, when the UE is in a roaming state, the network is a visited network. In this embodiment, the local network refers to the network under the jurisdiction of the X-CSCF.

As shown in Figure 2, the method for providing location-related services in the IMS network described in this embodiment includes the following steps:

In step 21, the UE initiates an LDS request to the network it accesses (if the UE is in a roaming state, the network is a visited network) for starting a local LDS session.

Here, the LDS request includes the LDS service type requested by the UE and UE context (Contexts) information. UE context information is defined as any information describing user identity and user location, such as UE current location information, UE IP address, domain name of UE home domain, etc., and may also include other information related to the user.

Step 22, the X-CSCF of the network receives the LDS request, parses the LDS request, recognizes that this is a request for a local LDS session, and obtains the LDS service type and UE context requested by the UE contained therein information, and send the LDS service type and UE context information requested by the UE to LaSSF through the Cs interface.

Step 23, after the LaSSF receives the LDS service type and UE context information requested by the UE sent by the above-mentioned X-CSCF, according to the LDS service type requested by the UE, the UE context information and the AS information in the local network saved by itself, from the local Among the ASs in the network, select the AS that provides the service corresponding to the LDS request of the UE for the UE: if the AS that provides the corresponding service for the UE is selected, go to step 24; if no AS is selected for the UE If the UE provides the AS of the corresponding service, go to step 25.

In the above step 23, the AS information in the local network is stored at the LaSSF as an example for illustration. Of course, the AS information in the local network can also be stored in the local network, for example, on a predetermined server in the local network, and the LaSSF obtains the AS information in the local network from the server. In addition, the LaSSF may also send a search request for searching the AS in the local network to the local network through the CSCF, and obtain the AS information of the local network according to the response message returned by the AS in the local network to the search request.

Step 24, the LaSSF determines the routing information of the selected AS according to the AS information in the local network saved by itself, and returns the routing information of the selected AS to the X-CSCF; the X-CSCF returns the routing information according to the LaSSF Routing information of the selected AS, forwarding the LDS request to the selected AS to trigger the establishment of an LDS session between the UE and the selected AS; the selected AS receives the LDS After the request, respond to the LDS request, establish an LDS session with the UE, so as to provide the UE with a service corresponding to the UE's LDS request, and this process ends.

Step 25, LaSSF sends a search request to the local network through the CSCF to search for ASs in the local network; the AS in the local network receives and responds to the search request, returns a response message to LaSSF through the X-CSCF, and responds The message contains information such as the route of the AS and the LDS service type that the AS can provide; the LaSSF updates the AS information of the local network saved by itself according to the response message, and then returns to step 23.

Here, in order to avoid an infinite loop, in the above process, if LaSSF does not find an AS that provides the corresponding service for the UE when LaSSF executes the above step 23 for the second time, it returns an LDS request response to the UE through the X-CSCF The message is used to notify the UE that there is no AS that can provide the corresponding LDS service in the local network, and then end the above procedure.

In this embodiment, the LaSSF may further store the historical information of the UE, where the historical information of the UE stores the AS information selected by the LaSSF to provide the LDS for the UE. In the above step 23, the LaSSF further selects the AS information of the local network from the AS of the local network to provide The AS corresponding to the service, and updating the history information of the UE according to the information of the selected AS. Specifically, the selection of the AS may be performed according to various selection algorithms in the prior art.

It can be seen from the above that, in the method described in this embodiment, by adding LaSSF to the existing IMS architecture, the LaSSF selects an AS that provides LDS for the UE, and notifies the X-CSCF of the routing information of the selected AS, Then the X-CSCF forwards the UE's LDS request to the corresponding AS, thereby establishing an LDS session between the UE and the AS to provide LDS services. Moreover, in this embodiment, when the LaSSF does not find a suitable AS for the initial selection, it further initiates an AS search in the local network, updates the AS information in the local network, and selects a suitable AS for the UE again according to the updated AS information, To satisfy the UE's LDS session request as much as possible. Finally, this embodiment further selects an AS for the UE according to the historical information of the UE by saving the historical information of the UE, so that the selected AS is more in line with the requirements of the UE.

The above method will be described in more detail through a specific application example below.

It is assumed that multiple ASs respectively corresponding to different movie theaters are set in the IMS network, and each AS provides movie screening information and movie ticket reservation service of the corresponding movie theater respectively. The routing information of these ASs is pre-stored in LaSSF, and these ASs are classified as "movie theaters". At the same time, the relevant information of the movie theaters corresponding to these ASs is also saved, such as the geographical location of the movie theater, the theater environment of the movie theater, and the ticket of the movie theater. price ranges, movie screening information, and more.

Assuming that the UE wants to go to the cinema to watch a recently released movie, the UE sends an LDS request to the X-CSCF at this time. The LDS request contains the LDS service type requested by the UE and the UE context information. Specifically, the LDS service type can be For movie theater query, the UE context may include information such as the title of the movie that the UE wants to watch, the current geographic location of the UE, the theater environment expected by the UE, and the ticket price of the movie expected by the UE.

After X-CSCF receives and recognizes the above LDS request, it parses out the LDS service type and UE context information, and sends the parsed LDS service type and UE context information to LaSSF.

After receiving the LDS service type and UE context information requested by the UE from the X-CSCF, the LaSSF selects an appropriate AS for the UE according to the LDS service type requested by the user, the UE context information, and the AS information in the local network saved by itself. Specifically, the LDS service type requested by the UE is a movie theater query. Therefore, from the local AS classified as a movie theater, according to the name of the movie that the UE wants to watch, the current geographic location of the UE, the theater environment expected by the UE, and the desired The movie ticket price and other information, and select an AS that meets the requirements of the UE. This embodiment does not limit the specific selection algorithm.

After the LaSSF selects an AS (assumed to be the first AS) that meets the requirements of the UE, it sends the routing information of the first AS to the X-CSCF. The X-CSCF forwards the LDS request to the first AS according to the routing information. The first AS responds to the UE's LDS request and establishes an LDS session with the UE. Therefore, the UE can perform specific operations such as movie information query and movie ticket reservation on the first AS.

Finally, based on the above method for providing location-related services in an IMS network, this embodiment also provides a LaSSF and an IMS network.

As shown in Figure 3, the LaSSF provided by this embodiment is set in the IMS network and connected to the CSCF, specifically including:

The receiving unit is configured to receive the LDS service type and UE context information requested by the UE sent by the CSCF, and the LDS service type and UE context information are obtained by the CSCF after parsing the LDS request sent by the UE for starting an LDS session of;

The AS selection unit is configured to select the AS that provides the corresponding service for the UE from the ASs in the local network according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network, and select the selected AS The routing information is returned to the CSCF to notify the CSCF to forward the LDS request to the selected AS.

Preferably, above-mentioned LaSSF also comprises:

AS information storage unit, used for saving AS information in the local network;

The AS selection unit is further configured to select from the ASs in the local network to provide the UE with the AS information according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network stored by the AS information storage unit. The AS of the corresponding service.

Preferably, above-mentioned LaSSF also comprises:

An AS discovery unit, configured to send a search request for searching an AS in the local network to the local network through the CSCF when the AS selection unit does not select an AS that provides the corresponding service for the UE, and according to the local network In response to the response message returned by the search request, the AS in the AS updates the AS information in the local network stored by the AS information storage unit, and triggers the AS selection unit to select an AS that provides corresponding services for the UE again.

Preferably, the above LaSSF further includes: a UE history information storage unit, configured to store the UE history information, and the UE history information stores the AS information selected by the LaSSF to provide LDS for the UE. At this time, the AS selection unit is further configured to select from the ASs of the local network to provide the UE with corresponding service AS, and update the historical information of the UE stored in the UE historical information storage unit according to the information of the selected AS.

Preferably, the above-mentioned CSCF is a P-CSCF or an S-CSCF; the above-mentioned UE context information includes: current location information of the UE, IP address of the UE, and domain name of the home domain of the UE.

The IMS network provided in this embodiment includes a CSCF, an AS, and a LaSSF, and the LaSSF is connected to the CSCF; wherein,

The CSCF is configured to receive an LDS request sent by a user equipment UE for starting a location-related service LDS session, the LDS request includes the LDS service type requested by the UE and UE context information; parse the LDS request, and obtain UE The requested LDS service type and UE context information, and send the service type and UE context information requested by the UE to the LaSSF; and receive the routing information of the AS that provides the corresponding service for the UE returned by the LaSSF, and send The LDS request is forwarded to the AS that provides corresponding services for the UE, so as to trigger the establishment of an LDS session between the UE and the first AS;

The LaSSF is configured to receive the LDS service type and UE context information requested by the UE sent by the CSCF, and select from the AS in the local network according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network Find the AS that provides the corresponding service for the UE, and return the routing information of the AS that provides the corresponding service for the UE to the CSCF;

The AS is configured to receive and respond to the LDS request from the UE forwarded by the CSCF, and establish an LDS session with the UE.

Preferably, the above-mentioned LaSSF is also used to save AS information in the local network by itself, and select the AS information from the local network according to the LDS service type requested by the UE, the UE context information, and the AS information of the local network saved by itself. An AS that provides corresponding services for the UE.

Preferably, the above-mentioned LaSSF is further configured to send a search request for searching an AS in the local network to the local network through the CSCF when no AS providing corresponding services for the UE is selected, and according to the AS in the local network In response to the response message returned by the search request, the AS updates the AS information of the local network stored by itself; then, selects an AS that provides corresponding services for the UE again.

Preferably, the above-mentioned LaSSF is also used to store the historical information of the UE, and the historical information of the UE stores the AS information selected by the LaSSF for providing LDS for the UE, and further according to the historical information of the UE , the LDS service type requested by the UE, the UE context information, and the AS information of the local network saved by itself, select the AS that provides the corresponding service for the UE from the ASs of the local network, and update the AS information according to the selected AS information UE history information.

Preferably, in the above IMS network, the CSCF is P-CSCF or S-CSCF; the UE context information includes: UE current location information, UE IP address and domain name of UE home domain.

In summary, the method for providing location-related services in the IMS network provided by the embodiments of the present invention, LaSSF and the IMS network can realize the functions of collecting, managing and selecting location-related services (LDS) under the existing IMS architecture, thereby It makes up for the lack of 3GPP standard in LDS business, and promotes the creation and promotion of local LDS.

The above is only the embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as Be the protection scope of the present invention.

Claims (15)

1. A method for providing location-related service LDS in Internet Protocol Multimedia Subsystem IMS network, is characterized in that, comprises: Step A, the call session control function entity CSCF receives the LDS request sent by the user equipment UE for starting the location-related service LDS session, and the LDS request includes the LDS service type requested by the UE and UE context information; Step B, the CSCF parses the LDS request, acquires the LDS service type and UE context information requested by the UE, and sends the LDS service type and UE context information requested by the UE to the location-based service selection function entity LaSSF; Step C, the LaSSF selects the AS that provides the corresponding service for the UE from the ASs in the local network according to the LDS service type requested by the UE, the UE context information, and the application server AS information in the local network, and sends the selected AS The routing information of the AS is returned to the CSCF, and step D is entered; Step D, the CSCF forwards the LDS request to the selected AS according to the routing information of the selected AS returned by the LaSSF; Step E, the selected AS establishes an LDS session with the UE according to the LDS request. 2. The method according to claim 1, wherein the LaSSF further saves the AS information in the local network itself, and in the step C, the LaSSF is further based on the LDS service type and UE context information requested by the UE and the AS information in the local network saved by itself, and select the AS that provides corresponding services for the UE from the ASs in the local network. 3. The method according to claim 2, wherein, in the step C, if the LaSSF does not select the AS information of the local network according to the LDS service type requested by the UE, the UE context information and the self-preserved The UE provides the AS of the corresponding service, and the method further includes: Step F, LaSSF sends a search request for searching AS in the local network to the local network through the CSCF, and updates the AS information of the local network saved by itself according to the response message returned by the AS in the local network for the search request , and return to step C. 4. The method according to any one of claims 1 to 3, wherein the LaSSF further saves the historical information of the UE, and the historical information of the UE stores the information selected by the LaSSF for the UE. Provide AS information of LDS; In the step C, the LaSSF further selects an AS from the local network to provide the corresponding service for the UE according to the history information of the UE, the LDS service type requested by the UE, the UE context information, and the AS information of the local network. AS, and update the history information of the UE according to the information of the selected AS. 5. The method of claim 4, wherein, The CSCF is a proxy call session control function entity P-CSCF or a serving call session control function entity S-CSCF; The UE context information includes: the current location information of the UE, the IP address of the UE, and the domain name of the home domain of the UE. 6. A service selection function entity LaSSF based on location awareness in an Internet Protocol Multimedia Subsystem IMS network, said LaSSF is connected with a call session control function entity CSCF, it is characterized in that said LaSSF comprises: The receiving unit is configured to receive the LDS service type and UE context information requested by the user equipment UE sent by the CSCF, and the LDS service type and UE context information are the analysis of the LDS request sent by the CSCF to the UE for starting an LDS session later obtained; The AS selection unit is configured to select the AS that provides the corresponding service for the UE from the ASs in the local network according to the LDS service type requested by the UE, the UE context information, and the AS information of the application server in the local network, and will be selected The routing information of the AS is returned to the CSCF. 7. LaSSF as claimed in claim 6, is characterized in that, also comprises: AS information storage unit, used for storing AS information in the local network; The AS selection unit is further configured to select from the ASs in the local network to provide the UE with the AS information according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network stored by the AS information storage unit. The AS of the corresponding service. 8. LaSSF as claimed in claim 7, is characterized in that, also comprises: An AS discovery unit, configured to send a search request for searching an AS in the local network to the local network through the CSCF when the AS selection unit does not select an AS that provides the corresponding service for the UE, and according to the local network In response to the response message returned by the search request, the AS in the AS updates the AS information in the local network stored by the AS information storage unit, and triggers the AS selection unit to select an AS that provides corresponding services for the UE again. 9. The LaSSF according to any one of claims 6 to 8, further comprising: a UE historical information storage unit, configured to save the historical information of the UE, where the historical information of the UE contains the AS information selected by the LaSSF to provide LDS for the UE; The AS selection unit is further configured to select an AS that provides corresponding services for the UE from ASs in the local network according to the historical information of the UE, the LDS service type requested by the UE, the UE context information, and the AS information of the local network , and update the historical information of the UE stored in the UE historical information storage unit according to the information of the selected AS. 10. LaSSF as claimed in claim 9, is characterized in that, The CSCF is a proxy call session control function entity P-CSCF or a serving call session control function entity S-CSCF; The UE context information includes: the current location information of the UE, the IP address of the UE, and the domain name of the home domain of the UE. 11. An Internet Protocol Multimedia Subsystem IMS network, characterized in that it includes a call session control function entity CSCF, an application server AS and a location-aware service selection function entity LaSSF, and the LaSSF is connected to the CSCF; wherein, The CSCF is configured to receive an LDS request sent by a user equipment UE for starting a location-related service LDS session, the LDS request includes the LDS service type requested by the UE and UE context information; parse the LDS request, and obtain UE The requested LDS service type and UE context information, and send the service type and UE context information requested by the UE to the LaSSF; and receive the routing information of the AS that provides the corresponding service for the UE returned by the LaSSF, and send The LDS request is forwarded to the AS that provides corresponding services for the UE; The LaSSF is configured to receive the LDS service type and UE context information requested by the UE sent by the CSCF, and select from the AS in the local network according to the LDS service type requested by the UE, the UE context information, and the AS information in the local network Find the AS that provides the corresponding service for the UE, and return the routing information of the AS that provides the corresponding service for the UE to the CSCF; The AS is configured to receive and respond to the LDS request from the UE forwarded by the CSCF, and establish an LDS session with the UE. 12. The IMS network according to claim 11, characterized in that, The LaSSF is also used to save the AS information in the local network by itself, and select the AS information from the AS in the local network according to the LDS service type requested by the UE, the UE context information and the AS information of the local network saved by itself. The AS that provides the corresponding service to the UE. 13. The IMS network according to claim 12, characterized in that, The LaSSF is further configured to send a search request for searching an AS in the local network to the local network through the CSCF when no AS is selected to provide the corresponding service for the UE, and according to the AS in the local network for The response message returned by the search request updates the AS information of the local network saved by itself; then, selects the AS that provides the corresponding service for the UE again. 14. The IMS network according to any one of claims 11 to 13, characterized in that, The LaSSF is also used to store the historical information of the UE, the historical information of the UE stores the AS information selected by the LaSSF to provide LDS for the UE, and further according to the historical information of the UE, the UE According to the requested LDS service type, UE context information and AS information of the local network, select the AS that provides corresponding services for the UE from the ASs of the local network, and update the historical information of the UE according to the information of the selected AS. 15. The IMS network according to claim 14, characterized in that, The CSCF is a proxy call session control function entity P-CSCF or a serving call session control function entity S-CSCF; The UE context information includes: the current location information of the UE, the IP address of the UE, and the domain name of the UE's home domain.

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