CN101730202B - Method and device for determining access network discovery and selection functional unit policy - Google Patents

Abstract

The invention discloses a method and a device for determining an access network discovery and selection functional unit policy. The method is used for determining the ANDSF policy for UE in a roaming state, wherein the ANDSF policy comprises an HANDSF policy and a VANDSF policy. The method comprises the following steps that: the UE acquires the HANDSF policy from an HANDSF, wherein the HANDSF policy carries indication information used for indicating whether to preferably select the HANDSF policy or not; and the UE acquires the indication information from the HANDSF policy and determines the used ANDSF policy according to the indication information. The method and the device for determining the access network discovery and selection functional unit policy solve the problem that the HANDSF policy and the VANDSF policy conflict with each other to further enable the UE to smoothly select the ANDSF policy.

Description

Method and device for determining policy of access network discovery and selection of functional units

technical field

The present invention relates to the communication field, in particular to a method and device for determining an Access Network Discovery and Selection Function (ANDSF for short) policy.

Background technique

The 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP) evolved packet system (Evolved Packet System, referred to as EPS) from the evolved universal mobile communication system terrestrial radio access network (Evolved Universal Terrestrial Radio Access Network, referred to as E-UTRAN), Mobility Management Entity (MME for short), Serving Gateway (S-GW for short), Packet Data Network Gateway (P-GW or PDN GW for short), attribution It consists of Home Subscriber Server (HSS for short), Policy and Charging Rules Function (Policy and Charging Rules Function, PCRF for short) and other supporting nodes.

Figure 1 is a schematic diagram of the EPS system architecture according to the related art. As shown in Figure 1, the EPS system supports intercommunication with non-3GPP systems, wherein the intercommunication with non-3GPP systems is realized through S2a/b/c interfaces, The anchor point between 3GPP and non-3GPP systems is P-GW. Non-3GPP systems are divided into trusted non-3GPP IP access and untrusted non-3GPP IP access. Trusted non-3GPP IP access can be directly connected to the P-GW through the S2a interface; untrusted non-3GPP IP access needs to be connected to the P-GW through an evolved packet data gateway (Evolved Packet Data Gateway, referred to as ePDG). The interface between P-GW is S2b, and S2c provides user plane-related control and mobility support between UE and P-GW. The mobility management protocol it supports is Mobile IPv6 (Moblie IPv6 Support for Dual Stack) Dual Stack Hosts and Routers, referred to as DSMIPv6).

In Figure 1, MME is responsible for mobility management, non-access stratum signaling processing, and user mobility management context management; S-GW is an access gateway device connected to E-UTRAN. -Forwarding data between UTRAN and P-GW, and responsible for caching paging waiting data, MME is connected to E-UTRAN through S1-MME, E-UTRAN is connected to S-GW through S1-U, and S-GW is connected to S11 Connected to MME; P-GW is the border gateway between EPS and Packet Data Network (PDN), responsible for PDN access and forwarding data between EPS and PDN. P-GW communicates with S- The GW is connected to the IP service provided by the operator through the SGi; the PCRF is a policy and charging rule functional entity, which is connected to the operator's network protocol (Internet Protocol, referred to as IP) service network through the receiving interface Rx to obtain service information. In addition, it is connected to the gateway device in the network through the Gx/Gxa/Gxc interface, where the PCRF is connected to the S-GW through Gxc, connected to the trusted non-3GPP IP access network through Gxa, and connected to the P-GW through Gx, The PCRF is responsible for initiating the establishment of the IP bearer through Rx and the IP service provided by the operator, ensuring the quality of service (Quality of Service, QoS for short) of the service data, and performing charging control.

In Figure 1, the MME is connected to the HSS through S6a, the HSS is connected to the 3GPP AAA server through Wx*, the 3GPP AAA is connected to the trusted non-3GPP IP access network through Ta*, and the 3GPP AAA is connected to the untrusted non-3GPP IP access network through Wa* The untrusted non-3GPP IP access network is connected to the ePDG through Wn*, and the ePDG is connected to the UE through Wu*.

ANDSF is proposed in Rel-8 Evolved Packet Core (EPC for short). When the UE is registered in the home network or the equivalent home network, if there are 3GPP and non-3GPP access networks or multiple non-3GPP access networks at the same time, EPS can provide the UE with access available at its current location through ANDSF Network information, so that the UE can select a suitable access network according to its own conditions. ANDSF includes two functions: data management and control functions, which can provide auxiliary data for network discovery and selection according to operator policies. ANDSF mainly provides two kinds of information: mobility policy between systems and access network discovery information. Inter-system mobility policies can be graded, for example: a general policy with no restrictions, a policy applied according to the active state of the UE, for example, different policies are specified for the UE in active and idle states, etc. The access network discovery information mainly includes: access network type: for example, wireless local area network (Wireless Local Area Network, referred to as WLAN), microwave access global interoperability (Worldwide Interoperability for Microwave Access, referred to as Wimax); access network identification: for example, Service Set Identifier (SSID for short) in WLAN; accessible PLMN information; priority of accessing the network, etc. The ANDSF may also limit the amount of information provided to the UE based on information such as the current location and capacity of the UE. Of course, according to the needs of operators, ANDSF can provide two kinds of information at the same time or only one of them. The ANDSF can be discovered through the Domain Name Server (DNS for short) function or the Dynamic Host Configuration Protocol (DHCP for short) service function, or the address of the ANDSF can be directly provided to the UE.

Fig. 2 is a schematic diagram of the use of ANDSF according to the related art. As shown in Fig. 2, the ANDSF (shown in the figure is a visited ANDSF (hereinafter referred to as VANDSF)) is directly connected to the UE through the S14 interface. The interface uses an Open Mobile Alliance (Open Mobile Alliance, OMA for short) device management (Device Manage, DM for short) protocol. The S14 interface supports pull (PULL) and push (PUSH) modes. In the PULL mode, the UE actively applies to the network and triggers the ANDSF to send network information to the UE. The PUSH mode is mainly triggered by the network to send data to the UE.

Fig. 3 is the flow chart of the work of ANDSF according to related art, as shown in Fig. 3, this workflow includes step 301 to step 306:

Step 301: The UE accesses the EPC system through the 3GPP access network or the non-3GPP access network, that is, the UE accesses the P-GW through the 3GPP or the non-3GPP access network.

Step 302: After the UE accesses the EPC system, it discovers the ANDSF.

Step 303: The UE sends a network access request message to the ANDSF, and the network access request message carries UE capability information (UE Capabilities) and UE location information (UELocation).

Step 304: After receiving the network access request message sent by the UE, the ANDSF sends a network access response message to the UE according to the location information reported by the UE, wherein the network access response message carries the access network information available at the current location of the UE. Network Information (Available Access Network Info) and Updated Inter-system Mobility Policies (Updated Inter-system Mobility Policies).

Step 305: After receiving the network access response message sent by the ANDSF, the UE performs network selection and handover decision.

Step 306: The UE initiates an inter-system handover according to its own needs.

Fig. 4 is a schematic diagram of ANDSF usage in a roaming scenario according to the related art. As shown in Fig. 4, UE is respectively connected to a home ANDSF (hereinafter referred to as HANDSF) and a VANDSF through two S14 interfaces. The HANDSF sends the relevant access network policy of the roaming UE to the UE, and the VANDSF sends the relevant access network policy of the visited location to the UE. Since the access network policies of the UE are provided by the HANDSF and the VANDSF respectively, the access network policies provided by the HANDSF and the VANDSF are likely to conflict. For example: the access network policy provided by HANDSF is: WLAN/SSID=v, Priority=1; WLAN/SSID=z, Priority=2. The access network strategy provided by VANDSF is: WLAN/SSID=z, Priority=1; WLAN/SSID=v, Priority=2. The UE handles these two conflicting access network policies through the following two principles:

(1) How to choose a radio access technology (Radio Access Technology, RAT for short) is determined by the visited network.

(2) In a roaming scenario, the home network can select its network priority.

Aiming at the problem of the conflict between the HANDSF strategy and the VANDSF strategy in the related art, no effective solution has been proposed yet.

Contents of the invention

The present invention is proposed in view of the conflict between the HANDSF strategy and the VANDSF strategy in the related art. Therefore, the main purpose of the present invention is to provide a solution for determining the ANDSF strategy to solve the above problems.

In order to achieve the above purpose, according to one aspect of the present invention, a method for determining an ANDSF strategy is provided.

The method for determining an ANDSF strategy according to the present invention is used to determine an ANDSF strategy for a user equipment in a roaming state, wherein the ANDSF strategy includes a home access network discovery and selection function entity HANDSF strategy and a visited access network discovery and selection function entity VANDSF strategy, the above method includes: the user equipment obtains the HANDSF strategy from HANDSF, wherein the HANDSF strategy carries indication information for indicating whether to preferentially select the HANDSF strategy; the user equipment obtains the indication information from the HANDSF strategy, and determines the used ANDSF strategy.

Wherein, the user equipment acquires the HANDSF policy from HANDSF includes: the user equipment sends a home access network request message to HANDSF, and carries the public land mobile telephone network identifier of the visiting place; the user equipment receives a home access network response message from HANDSF , wherein the home access network response message carries the HANDSF policy.

Preferably, after the user equipment sends the home access network request message to HANDSF, the above method further includes: HANDSF receives the home access network request message from the user equipment; Determine the HANDSF policy; HANDSF sends a home access network response message to the user equipment.

Wherein, the HANDSF determines the HANDSF strategy according to the public land mobile telephone network identification of the visited place reported by the user equipment, including: HANDSF judges whether the public land mobile telephone network identification of the visited place reported by the user equipment is equal to the locally stored public land mobile telephone network identification; If they are equal, the HANDSF policy delivered by the HANDSF to the user equipment is a local policy; if not, the HANDSF policy delivered by the HANDSF to the user equipment is a roaming policy.

Preferably, the HANDSF strategy further includes: roaming access network information available at the current location of the user equipment, and an updated system mobility strategy.

Preferably, before the user equipment acquires the HANDSF policy from the HANDSF, the above method further includes: the user equipment acquires the VANDSF policy from the VANDSF.

Preferably, after the user equipment acquires the HANDSF policy from the HANDSF, the above method further includes: the user equipment acquires the VANDSF policy from the VANDSF.

Wherein, the user equipment obtains the VANDSF policy from VANDSF includes: the user equipment sends a visiting access network request message to VANDSF, and carries the public land mobile telephone network identifier of the visiting place in it; the user equipment receives the home access network response message from VANDSF , wherein the home access network response message carries the VANDSF policy.

Preferably, after the user equipment sends the visited access network request message to VANDSF, the above method further includes: VANDSF receives the visited access network request message from the user equipment; Determine the VANDSF policy; VANDSF sends a visited access network response message to the user equipment.

Wherein, the VANDSF determines the VANDSF strategy according to the public land mobile telephone network identifier of the visited place reported by the user equipment, including: VANDSF judges whether the public land mobile telephone network identifier of the visited place reported by the user equipment is equal to the locally stored public land mobile telephone network identifier; If they are equal, the VANDSF policy delivered by the VANDSF to the user equipment is a local policy; if not, the VANDSF policy delivered by the VANDSF to the user equipment is a roaming policy.

Preferably, the VANDSF policy includes: roaming access network information available at the current location of the user equipment, and an updated system mobility policy.

Preferably, the indication information includes a predetermined flag, wherein when the predetermined flag is a first predetermined value, it is used to indicate that the HANDSF strategy is preferred, and when the predetermined flag is a second predetermined value, it is used to indicate that a VANDSF strategy is preferentially selected.

Preferably, in the case that the predetermined identifier is default, the indication information is used to indicate that the VANDSF policy is preferably selected.

In order to achieve the above purpose, according to another aspect of the present invention, a user equipment is provided.

The user equipment according to the present invention includes: a first acquiring module, configured to acquire a HANDSF strategy from HANDSF, wherein the HANDSF strategy carries indication information indicating whether to preferably select a HANDSF strategy; a second acquiring module, configured to acquire from the first Obtain instruction information from the HANDSF strategy obtained by the module; the first determination module is configured to determine the ANDSF strategy to be used according to the instruction information obtained by the second acquisition module, wherein the ANDSF strategy includes a HANDSF strategy and a VANDSF strategy.

In order to achieve the above purpose, according to another aspect of the present invention, a HANDSF is provided.

The HANDSF according to the present invention includes: a receiving module, configured to receive a home access network request message from the user equipment, wherein the home access network request message carries the public land mobile telephone network identifier of the visited place; the second determination module, It is used to determine the HANDSF strategy according to the public land mobile telephone network identifier of the visiting place reported by the user equipment, wherein the HANDSF strategy carries indication information for indicating whether to preferably select the HANDSF strategy; the sending module is used to send the home access to the user equipment A network response message, wherein the home network response message carries indication information.

Through the present invention, the UE obtains the HANDSF policy carrying the indication information for indicating whether the HANDSF policy is preferred to be selected from the HANDSF, and determines the ANDSF policy to use according to the indication information, which solves the problem of the conflict between the HANDSF policy and the VANDSF policy in the related art, and further To enable the UE to smoothly select the ANDSF strategy.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of a system architecture of an EPS according to related technologies;

FIG. 2 is a schematic diagram of the use of ANDSF according to the related art;

Fig. 3 is the flow chart of the work of ANDSF according to related art;

FIG. 4 is a schematic diagram of ANDSF usage in a roaming scenario according to related technologies;

Fig. 5 is a flowchart of a method for determining an ANDSF strategy according to an embodiment of the present invention;

FIG. 6 is a flowchart of UE processing conflict policies in a roaming scenario according to Embodiment 1 of the present invention;

FIG. 7 is a flowchart of UE processing conflict policies in a roaming scenario according to Embodiment 2 of the present invention;

FIG. 8 is a structural block diagram of a UE according to an embodiment of the present invention;

Fig. 9 is a structural block diagram of HANDSF according to an embodiment of the present invention.

Detailed ways

Functional Overview

Considering the conflict between the HANDSF policy and the VANDSF policy in the related art, the embodiment of the present invention provides a solution for determining the ANDSF policy, which is used to resolve the conflict between the HANDSF policy and the VANDSF policy under the principle that the UE handles the policy conflict of the access network in the roaming scenario . The processing principle of this solution is as follows: by default, the UE uses the policy of the visited network (ie, the VANDSF policy) as the default policy. If the message returned by the HANDSF carries an identifier, which requires respecting the wish of the home network and not allowing modification of the HANDSF policy, then the UE follows the policy of the home network (ie, the HANDSF policy).

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

method embodiment

According to an embodiment of the present invention, a method for determining an ANDSF policy is provided for determining an ANDSF policy for a UE in a roaming state, wherein the ANDSF policy includes a HANDSF policy and a VANDSF policy.

FIG. 5 is a flowchart of a method for determining an ANDSF strategy according to an embodiment of the present invention. As shown in FIG. 5 , the method includes the following steps S502 to S504:

In step S502, the UE obtains the HANDSF policy from the HANDSF, wherein the HANDSF policy carries indication information for indicating whether to preferably select the HANDSF policy. The HANDSF policy may also include: roaming access network information available at the current location of the UE, and updated system mobility policies (Updated Inter-system Mobility Policies).

Wherein, the indication information may include a predetermined flag, wherein, when the predetermined flag is a first predetermined value (for example, 1), it is used to indicate that the HANDSF strategy is preferably selected, and when the predetermined flag is a second predetermined value (for example, 0), it is used for Indicates that the VANDSF strategy is preferably selected. In the case of a default predetermined identifier, the indication information is used to indicate that the VANDSF strategy is preferably selected.

In step S504, the UE obtains indication information from the HANDSF policy, and determines the ANDSF policy to use according to the indication information.

In a specific implementation process, the operation of step S502 may include:

(1) The UE sends a home access network request message to the HANDSF, which carries the Visit Public Land Mobile Network ID (VPLMNID for short) of the visited location.

(2) The HANDSF receives the home access network request message from the UE, and determines the HANDSF policy according to the VPLMNID reported by the UE, and then sends the home access network response message to the UE.

Specifically, the HANDSF judges whether the VPLMNID reported by the UE is equal to the locally stored PLMNID. If they are equal, the HANDSF policy issued by the HANDSF to the UE is a local policy; if not, the HANDSF policy issued by the HANDSF to the UE is a roaming policy.

(3) The UE receives the home access network response message from the HANDSF, wherein the home access network response message carries the HANDSF policy.

Before step S502 or after step S502, the method may further include the following operations: the UE acquires a VANDSF policy from the VANDSF, and the VANDSF policy may include: roaming access network information available at the current location of the UE, and an updated system mobility policy. This operation may specifically include the following steps:

(1) The UE sends a Visit Network Access Request message to the VANDSF, which carries the VPLMNID.

(2) The VANDSF receives the visited network access request message from the UE, and determines the VANDSF policy according to the VPLMNID reported by the UE, and then, the VANDSF sends a visited network access response message to the UE.

Specifically, the VANDSF judges whether the VPLMNID reported by the UE is equal to the locally stored PLMNID; if they are equal, the VANDSF policy issued by the VANDSF to the UE is a local policy; if not, the VANDSF policy issued by the VANDSF to the UE is a roaming policy.

(3) The UE receives the home access network response message from the VANDSF, wherein the home access network response message carries the VANDSF policy.

Through this embodiment, the UE obtains the HANDSF strategy carrying the indication information for indicating whether to prefer to select the HANDSF strategy from the HANDSF, and determines the ANDSF strategy to use according to the indication information, which solves the problem of the conflict between the HANDSF strategy and the VANDSF strategy in the related art, Thus, the UE can successfully select the ANDSF strategy.

The implementation process of the embodiment of the present invention will be described in detail below with reference to examples.

Embodiment one

The UE first accesses the EPC system through a 3GPP access network or a trusted/untrusted non-3GPP access network. In the roaming scenario, the UE obtains different policies A1 and A2 from the HANDSF and the VANDSF respectively. This embodiment mainly deals with the conflict between policy A1 and policy A2.

FIG. 6 is a flowchart of UE processing conflicting policies in a roaming scenario according to Embodiment 1 of the present invention. As shown in FIG. 6 , the process includes the following steps 601 to 603:

Step 601: The UE acquires the visited access network policy (that is, the VANDSF policy) from the VANDSF. The VANDSF policy includes: Available Access Network Info (Available Access Network Info) at the current location of the UE and an updated system mobility policy (Updated Inter-system Mobility Policies).

The processing of this step 601 specifically includes the following steps:

(1) The UE sends a network access request message to VANDSF, and the network access request message carries UE capability information (UE Capabilities), UE location information (UE Location), and VPLMNID.

(2) After receiving the network access request message sent by the UE, the VANDSF judges whether the VPLMNID reported by the UE is equal to the local PLMNID of the VANDSF. If they are not equal, the policy issued by the VANDSF to the UE is a roaming policy. If they are equal, the policy issued by the VANDSF to the UE is a local policy.

(3) VANDSF sends a visited access network response message to the UE according to the location information reported by the UE. The visited access network response message carries the access network information (Available Access Network Info) and Updated Inter-system Mobility Policies.

Step 602: The UE acquires the roaming policy of the home access network (ie, the HANDSF policy) from the HANDSF. The HANDSF policy includes: the information of the roaming access network available at the current location of the UE and the updated system mobility policy, and at the same time, the HANDSF sends the wish identifier to the UE (that is, the above-mentioned predetermined identifier), if the UE in the home network follows the policy of the visited destination, the desired identifier is set to 1. By default, this wish flag is 0.

The processing of this step 602 includes the following steps:

(1) The UE sends a home access network request message to the HANDSF, which carries UE capability information (UE Capabilities), UE location information (UE Location), and VPLMNID.

(2) After receiving the home access network request message sent by the UE, the HANDSF judges whether the VPLMNID reported by the UE is equal to the local PLMNID of the HANDSF. If not, the HANDSF policy issued by the HANDSF to the UE is a roaming policy. If they are equal, the HANDSF policy issued by the HANDSF to the UE is a local policy.

(3) HANDSF sends a home access network response message to UE, the home access network response message carries roaming access network information available at UE's current location and the updated system mobility policy, and at the same time HANDSF sends a desire identifier to UE, if The home network UE sets the wish flag to 1 based on the home policy. By default, this wish flag is 0.

Step 603: UE judges the wish identifier sent by HANDSF, if it is 1, then modify the default strategy to the home access network strategy (that is, HANDSF strategy), otherwise, the default strategy is the visited access network strategy (that is, VANDSF strategy) Strategy).

Through this embodiment, a processing flow of obtaining the VANDSF policy from the VANDSF before the UE obtains the HANDSF policy from the HANDSF is provided.

Embodiment two

The UE first accesses the EPC system through a 3GPP access network or a trusted/untrusted non-3GPP access network. In the roaming scenario, the UE obtains different policies A1 and A2 from the HANDSF and the VANDSF respectively. This embodiment mainly deals with the conflict between policy A1 and policy A2.

Fig. 7 is a working flow chart of UE processing conflict policy in a roaming scenario according to Embodiment 2 of the present invention. As shown in Fig. 7, the process includes the following steps 701 to 703:

Step 701: The UE acquires the roaming policy of the home access network (i.e., the HANDSF policy) from the HANDSF. The HANDSF policy includes: the roaming access network information available at the current location of the UE and the updated system mobility policy, and at the same time, the HANDSF sends a wish identifier to the UE (that is, the above-mentioned predetermined identifier), if the UE in the home network follows the policy of the visited destination, the desired identifier is set to 1. By default, this wish flag is 0.

The processing of this step 701 includes the following steps:

(1) The UE sends a home access network request message to the HANDSF, which carries UE capability information (UE Capabilities), UE location information (UE Location), and VPLMNID.

(2) After receiving the home access network request message sent by the UE, the HANDSF judges whether the VPLMNID reported by the UE is equal to the local PLMNID of the HANDSF. If not, the HANDSF policy issued by the HANDSF to the UE is a roaming policy. If they are equal, the HANDSF policy issued by the HANDSF to the UE is a local policy.

(3) HANDSF sends a home access network response message to UE, the home access network response message carries roaming access network information available at UE's current location and the updated system mobility policy, and at the same time HANDSF sends a desire identifier to UE, if The home network UE sets the wish flag to 1 based on the home policy. By default, this wish flag is 0.

Step 702: The UE obtains the visited access network policy (that is, the VANDSF policy) from the VANDSF. The VANDSF policy includes: Available Access Network Info (Available Access Network Info) at the current location of the UE and an updated system mobility policy (Updated Inter-system Mobility Policies).

The processing of this step 702 specifically includes the following steps:

(1) The UE sends a network access request message to VANDSF, and the network access request message carries UE capability information (UE Capabilities), UE location information (UE Location), and VPLMNID.

(2) After receiving the network access request message sent by the UE, the VANDSF judges whether the VPLMNID reported by the UE is equal to the local PLMNID of the VANDSF. If they are not equal, the policy issued by the VANDSF to the UE is a roaming policy. If they are equal, the policy issued by the VANDSF to the UE is a local policy.

(3) VANDSF sends a visited access network response message to the UE according to the location information reported by the UE. The visited access network response message carries the access network information (Available Access Network Info) and Updated Inter-system Mobility Policies.

Step 703: UE judges the desire identifier sent by HANDSF, if it is 1, then modify the default strategy to the home access network strategy (that is, HANDSF strategy), otherwise, the default strategy is the visited access network strategy (that is, VANDSF strategy) Strategy).

Through this embodiment, a processing flow of obtaining the VANDSF policy from the VANDSF after the UE obtains the HANDSF policy from the HANDSF is provided.

Device embodiment

Embodiment one

According to an embodiment of the present invention, a UE is provided. FIG. 8 is a structural block diagram of a UE according to an embodiment of the present invention. As shown in FIG. 8 , the UE includes: a first obtaining module 82 , a second obtaining module 84 , and a first determining module 86 . The above structure will be described below.

The first obtaining module 82 is used to obtain the HANDSF strategy from HANDSF, wherein the HANDSF strategy carries indication information for indicating whether to preferably select the HANDSF strategy; the second obtaining module 84 is connected to the first obtaining module for obtaining from the first The instruction information is obtained from the HANDSF strategy acquired by the module 82; the first determination module 86 is connected to the second acquisition module 84, and is used to determine the ANDSF strategy used according to the instruction information obtained by the second acquisition module 84, wherein the ANDSF strategy includes the HANDSF strategy with the VANDSF strategy.

Wherein, the indication information may include a predetermined flag, wherein, when the predetermined flag is a first predetermined value (for example, 1), it is used to indicate that the HANDSF strategy is preferably selected, and when the predetermined flag is a second predetermined value (for example, 0), it is used for Indicates that the VANDSF strategy is preferably selected. In the case of a default predetermined identifier, the indication information is used to indicate that the VANDSF strategy is preferably selected.

Through this embodiment, the UE can obtain from the HANDSF the HANDSF policy carrying the indication information indicating whether the HANDSF policy is preferably selected, and determine the ANDSF policy to use according to the indication information.

Embodiment two

According to an embodiment of the present invention, a HANDSF is provided. Fig. 9 is a structural block diagram of HANDSF according to an embodiment of the present invention. As shown in Fig. 9, the HANDSF includes a receiving module 92, a second determining module 94, and a sending module 96, and the above structure will be described below.

The receiving module 92 is configured to receive the home access network request message from the UE, wherein the home access network request message carries the VPLMNID; the second determining module 94 is connected to the receiving module 92, and is used to determine the HANDSF according to the VPLMNID reported by the UE Strategy, wherein the HANDSF strategy carries indication information for indicating whether to preferably select the HANDSF strategy; the sending module 96 is connected to the second determination module 94, and is used to send a home access network response message to the UE, wherein the home network response message contains instructions.

Wherein, the indication information may include a predetermined flag, wherein, when the predetermined flag is a first predetermined value (for example, 1), it is used to indicate that the HANDSF strategy is preferably selected, and when the predetermined flag is a second predetermined value (for example, 0), it is used for Indicates that the VANDSF strategy is preferably selected. In the case of a default predetermined identifier, the indication information is used to indicate that the VANDSF strategy is preferably selected.

Through this embodiment, the HANDSF can determine the HANDSF policy carrying the indication information for indicating whether to preferably select the HANDSF policy according to the home access network request message from the UE, and send the HANDSF policy to the UE.

To sum up, through the above-mentioned embodiments of the present invention, the UE acquires the HANDSF policy carrying the indication information indicating whether to select the HANDSF policy preferably from the HANDSF, and determines the ANDSF policy to use according to the indication information, which solves the problem of HANDSF in the related art. The conflict between the policy and the VANDSF policy enables the UE to smoothly select the ANDSF policy.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by computing devices, thus, they can be stored in storage devices and executed by computing devices, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (19)

1. definite method of an access network discovery and selection function unit ANDSF strategy, be used to the subscriber equipment that is under the roaming state to determine the ANDSF strategy, wherein, described ANDSF strategy comprises ownership access network discovery and selection functional entity HANDSF strategy and visit access network discovery and selection functional entity VANDSF strategy, it is characterized in that, described method comprises:

Subscriber equipment obtains described HANDSF strategy from HANDSF, wherein, carries in the described HANDSF strategy and is used to indicate the indication information of whether preferentially selecting the HANDSF strategy;

Described subscriber equipment obtains described indication information from described HANDSF strategy, and determines that according to described indication information the ANDSF that uses is tactful.

2. method according to claim 1 is characterized in that, described subscriber equipment obtains described HANDSF strategy from described HANDSF and comprises:

Described subscriber equipment sends the home access network request message to HANDSF, and carries therein the public land mobile network sign of visited place;

Described subscriber equipment receives the home access network response message from described HANDSF, wherein, carries described HANDSF strategy in the described home access network response message.

3. method according to claim 2 is characterized in that, after described subscriber equipment sent described home access network request message to described HANDSF, described method also comprised:

Described HANDSF receives the described home access network request message from described subscriber equipment;

Described HANDSF determines described HANDSF strategy according to the public land mobile network sign of the described visited place of described user equipment to report;

Described HANDSF sends described home access network response message to described subscriber equipment.

4. method according to claim 3 is characterized in that, described HANDSF determines that according to the public land mobile network sign of the described visited place of described user equipment to report described HANDSF strategy comprises:

Described HANDSF judges whether the public land mobile network sign of the described visited place of described user equipment to report equates with the public land mobile network sign of local storage;

If equate, then described HANDSF is local policy to the described HANDSF strategy that described subscriber equipment issues;

If unequal, then described HANDSF is the roaming strategy to the described HANDSF strategy that described subscriber equipment issues.

5. each described method in 4 according to claim 1 is characterized in that, described HANDSF strategy also comprises:

The roaming access network information that described subscriber equipment current location can be used, system's shift strategy of renewal.

6. method according to claim 1 is characterized in that, before described subscriber equipment obtained described HANDSF strategy from described HANDSF, described method also comprised:

Described subscriber equipment obtains described VANDSF strategy from described VANDSF.

7. method according to claim 1 is characterized in that, after described subscriber equipment obtained described HANDSF strategy from described HANDSF, described method also comprised:

Described subscriber equipment obtains described VANDSF strategy from described VANDSF.

8. according to claim 6 or 7 described methods, it is characterized in that, described subscriber equipment obtains described VANDSF strategy from described VANDSF and comprises:

Described subscriber equipment sends visit access network request message to described VANDSF, and carries therein the public land mobile network sign of visited place;

Described subscriber equipment receives the home access network response message from described VANDSF, wherein, carries described VANDSF strategy in the described home access network response message;

Described subscriber equipment sent described visit access network request message to described VANDSF after, described method also comprised:

Described VANDSF receives the described visit access network request message from described subscriber equipment;

Described VANDSF determines described VANDSF strategy according to the public land mobile network sign of the described visited place of described user equipment to report;

Described VANDSF sends described visit access network response message to described subscriber equipment.

9. method according to claim 8 is characterized in that, described VANDSF determines that according to the public land mobile network sign of the described visited place of described user equipment to report described VANDSF strategy comprises:

Described VANDSF judges whether the public land mobile network sign of the described visited place of described user equipment to report equates with the public land mobile network sign of local storage;

If equate, then described VANDSF is local policy to the described VANDSF strategy that described subscriber equipment issues;

If unequal, then described VANDSF is the roaming strategy to the described VANDSF strategy that described subscriber equipment issues.

10. method according to claim 8 is characterized in that, described VANDSF strategy comprises:

The roaming access network information that described subscriber equipment current location can be used, system's shift strategy of renewal.

11. method according to claim 9 is characterized in that, described VANDSF strategy comprises:

The roaming access network information that described subscriber equipment current location can be used, system's shift strategy of renewal.

12. according to claim 1 to 4,6,7, in each described method, it is characterized in that, described indication information comprises predetermined sign, wherein, at the described predetermined described HANDSF strategy of preferential selection that is used to indicate when being designated the first predetermined value, at the described predetermined described VANDSF strategy of preferential selection that is used to indicate when being designated the second predetermined value.

13. method according to claim 8, it is characterized in that, described indication information comprises predetermined sign, wherein, at the described predetermined described HANDSF strategy of preferential selection that is used to indicate when being designated the first predetermined value, at the described predetermined described VANDSF strategy of preferential selection that is used to indicate when being designated the second predetermined value.

14. method according to claim 9, it is characterized in that, described indication information comprises predetermined sign, wherein, at the described predetermined described HANDSF strategy of preferential selection that is used to indicate when being designated the first predetermined value, at the described predetermined described VANDSF strategy of preferential selection that is used to indicate when being designated the second predetermined value.

15. method according to claim 12 is characterized in that, in the situation that described predetermined sign is default, described indication information is used to indicate the described VANDSF strategy of preferential selection.

16. method according to claim 13 is characterized in that, in the situation that described predetermined sign is default, described indication information is used to indicate the described VANDSF strategy of preferential selection.

17. method according to claim 14 is characterized in that, in the situation that described predetermined sign is default, described indication information is used to indicate the described VANDSF strategy of preferential selection.

18. a subscriber equipment is characterized in that, comprising:

The first acquisition module is used for obtaining the HANDSF strategy from ownership access network discovery and selection function unit HANDSF, wherein, carries in the described HANDSF strategy and is used to indicate the indication information of whether preferentially selecting the HANDSF strategy; The second acquisition module, the described HANDSF strategy that is used for obtaining from described the first acquisition module obtains described indication information;

The first determination module, the described indication information that is used for obtaining according to described the second acquisition module determines that the access network discovery and the selection function unit ANDSF that use are tactful, wherein, described ANDSF strategy comprises described HANDSF strategy and visit access network discovery and selection function unit VANDSF strategy.

19. one kind belongs to access network discovery and selection function unit HANDSF, it is characterized in that, comprising:

Receiver module is used for receiving the home access network request message from subscriber equipment, wherein, carries the public land mobile network sign of visited place in the described home access network request message;

The second determination module, be used for the definite HANDSF strategy of public land mobile network sign according to the described visited place of described user equipment to report, wherein, carry in the described HANDSF strategy and be used to indicate the indication information of whether preferentially selecting described HANDSF strategy;

Sending module is used for sending the home access network response message to described subscriber equipment, wherein, carries described indication information in the described home network response message.

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