WO2014146500A1

WO2014146500A1 - Radio access network switching method, and switching processing method and device

Info

Publication number: WO2014146500A1
Application number: PCT/CN2014/070161
Authority: WO
Inventors: 陈淑; 朱春晖; 霍玉臻
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-03-20
Filing date: 2014-01-06
Publication date: 2014-09-25
Also published as: CN104066136A

Abstract

Provided are a radio access network switching method, and a switching processing method and device, wherein the above-mentioned switching method is applied to a terminal. The method comprises: receiving a switching policy from an access network discovery and selection function (ANDSF) entity, wherein the switching policy is used for indicating that a terminal is switched to a second access network from a first access network when reaching the specified time (S502); and switching from the first access network to the second access network according to the switching policy (S504). By adopting the above-mentioned technical solution provided in the present invention, a ping-pong effect in the process of accessing a terminal to the radio access network is effectively avoided, and then the user experience is improved.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for switching and switching a radio access network. BACKGROUND OF THE INVENTION In order to maintain the competitiveness of the third generation mobile communication system in the communication field, users are provided with faster, less delayed, and more personalized mobile communication services, and at the same time, reduce operating costs of operators, the third generation The 3rd Generation Partnership Project (3GPP) Standards Working Group is working on the Evolved Packet System (EPS). The entire EPS system is divided into two parts: the wireless access network and the core network. The radio access network is composed of an Evolved NodeB (eNB) and a 3G radio network controller (RNC). It is mainly responsible for transmitting and receiving wireless signals, and is connected through the air interface and the terminal. Radio resources, resource scheduling, and access control for the air interface. In the core network, the Home Subscriber Server (HSS), the Mobility Management Entity (MME), and the General Packet Radio Service (GPRS) support are included. Serving GPRS Support Node (SGSN), Policy and Charging Rule Function (PCRF), Serving Gateway (S-GW), and PDN Gateway (referred to as PDN Gateway) FIG. 1 is a packet core network (Evolved) for accessing an evolved 3GPP and non-3GPP access system according to the related art.

Packet Core, referred to as EPC). As shown in Figure 1, the EPS system supports 3GPP access. The HSS is a permanent storage location for user subscription data, located in the home network to which the user subscribes. The MME is responsible for control plane related functions such as mobility management, processing of non-access stratum signaling, and management of user mobility management context. The S-GW is an access gateway device connected to the radio access network, and forwards data between the radio access and the P-GW, and buffers the data. The P-GW is a border gateway between EPS and Packet Data Network (PDN), which is responsible for PDN access and forwarding data between EPS and PDN. The PCRF is a policy and charging rule function entity that is connected to the carrier service network through the receiving interface Rx and is responsible for providing charging control, online credit control, threshold control, and services. Quality of Service (QoS for short). SGSN is GSM EDGE radio access network (GERAN, GSM is the abbreviation of Global System for Mobile communications, namely global mobile communication system, EDGE is the abbreviation of Enhanced Data Rate for GSM Evolution, ie enhanced type Data rate GSM evolution technology) and the global mobile communication system radio access network (Universal Mobile Telecommunication System Radio Access Network? UTRAN) user access node of the core network, functionally similar to the mobility management entity, responsible User location update, paging management, and bearer management. As shown in Figure 1, the EPS system also supports non-3GPP access. The interworking with the non-3GPP access is implemented through the S2a/S2b/S2c interface, and the P-GW serves as an anchor point between the 3GPP and the non-3GPP access. Non-3GPP access is divided into credit non-3GPP access and non-credit non-3GPP access. The non-3GPP access can be directly connected to the P-GW through the S2a interface, and the S2a interface uses the Proxy Mobile IP (PMIP) protocol for information exchange. The untrusted non-3GPP access is connected to the P-GW through an Evolved Packet Data Gateway (ePDG). The interface between the ePDG and the P-GW is S2b. The S2c interface provides user plane control and mobility support between User Equipment (UE) and P-GW. The mobility protocol supported by the S2c interface is Mobile IPv6 support for Dual Stack Hosts. And Routers, referred to as DSMIPv6). The above system in FIG. 1 can provide a better transmission rate, making Voice over IP (VoIP) a reality, so the evolved universal mobile communication system in the system is a terrestrial radio access network (Evolved UTRAN). , referred to as E-UTRAN for short) Access does not provide voice access separately. If you want to implement voice communication, in addition to VoIP, you can choose to fall back to the same coverage UTRAN and GERAN system for voice access. This technique of returning to the circuit domain for voice communication is called CSFB (Circuit Switched Fallback). The architecture diagram of the CSFB system is as shown in FIG. 2, and includes the following network elements: UE, having a terminal capable of accessing two types of wireless networks, called a dual mode terminal, and the UE of the present invention can access the GSM network and EPS. The network's dual-mode terminal also has CSFB capability. E-UTRAN, including eNodeB, will not be described again. GERAN UTRAN, which is a wireless access network of a conventional GSM/UMTS network, will not be described again. SGSN, no longer repeat them. The Mobile Switching Center Server (MSC Server) is the core network element of the CS domain of the GSM/UMTS network. It is responsible for user access, mobility, and control of voice and short message services in the circuit domain. The MME supports the CSFB function. You can create, maintain, delete, and associate the SGs interface between the MSC Server. The rest is not mentioned here. The rapid development of smart terminals and mobile Internet applications has made mobile data traffic proliferating at an incalculable rate. In order to effectively alleviate the pressure of traffic and continue to promote the development of mobile communication services, more and more operators around the world Businesses choose to develop a Wireless Local Area Network (WLAN) and use a low-cost, high-bandwidth WLAN to offload the cellular network. The Access Network Discovery and Selection Function (ANDSF) is used as an access anchor to enable intelligent network selection and effective network offloading through interaction between the network and the terminal. Collaborative operational direction. ANDSF develops strategies to help end users choose the best access network standard and achieve synergy for multiple access methods. In the prior art, ANDSF was proposed at R8. When the UE wants to select a network for registration, if there are both a 3GPP access network and a non-3GPP access network, the EPS may provide available access network information to the UE through the ANDSF according to the current location information of the UE, or an inter-system mobility policy. (Inter-System Mobility Policy, referred to as ISMP). The UE uses the information provided by the ANDSF to select an appropriate access network for registration. If multiple non-3GPP access networks exist at the same time, the EPS may provide an inter-system routing policy (ISRP) to the UE through the ANDSF according to the current location information of the UE, and the UE uses the information provided by the ANDSF to select an appropriate one. The access network is offloaded. As shown in Figure 3, the ANDSF is connected to the UE through the S14 interface. The interface uses the Open Mobile Alliance Device Management (OMA DM) protocol. In the prior art, the ANDSF can solve the problem of 3GPP handover to non-3GPP access network selection. It can also solve the problem of the offloading and routing of the multiple access terminals, for example, the UE (IP Flow Mobility capable UE, hereinafter referred to as IFOM capable UE) and the UE with the multi-access PDN connection capability ( Multiple Access PDN Connectivity capable UEs (abbreviated as MAPCON capable UEs), a traffic off-route problem with a Non-seamless WLAN offload capable UE (referred to as NS WO capable UE). In the prior art, a method for offloading to WLAN access can be provided through the ANDSF and the 3GPP process, and the method can ensure that the UE enjoys an optimal service experience. However, the prior art has the following problems, as shown in FIG. 4: 1. The operator determines that the WLAN is preferred to the UTRAN for a specific IP flow, but the E-UTRAN is more preferable than the WLAN. When switching from E-UTRAN to UTRAN, the stream to be PS-switched, based on the ANDSF policy, can be transmitted over the WLAN. Based on the ANDSF policy and the 3GPP procedure, the UE can switch such IP flows to the WLAN. If the handover to the E-UTRAN occurs again, the UE frequently switches between the E-UTRAN and WLAN access technologies, which brings a ping-pong effect. 2. In connection with CSFB, when the UE performs a circuit domain fallback call, after the end of the circuit domain call, the UE may return from the GERAN, UTRAN to the E-UTRAN. If the circuit domain call time is short, the UE may stay in GERAN or UTRAN for a short time before returning to E-UTRAN. A dual mode UE supporting 3GPP radio access type and WLAN, connected to LTE, accesses only PS services. For example, the UE does not route IP flows through multiple radio access interfaces at the same time. When the CS service is triggered, the UE falls back to GERAN or UTRAN. At the same time, the UE uses the ANDSF policy to trigger the UE to offload part of the IP flow to the WLAN. If the time of the CS service is very short, the UE may stay in the GERAN or UTRAN for a short time before returning to the E-UTRAN, and based on the ANDSF policy, the access priority of the E-UTRAN may be higher than the access priority of the WLAN. The UE may switch from the E-UTRAN to the WLAN again, so repeated switching may result in a ping-pong effect. In view of the above problems in the related art, an effective solution has not yet been proposed. SUMMARY OF THE INVENTION In the related art, there is a technical problem such as a ping-pong effect when performing handover of a radio access network, and an embodiment of the present invention provides a handover and handover processing method and apparatus for a radio access network, to at least solve the above problem. . According to an embodiment of the present invention, a method for handover of a radio access network is provided, which is applied to a terminal, the method comprising: receiving a handover policy from an ANDSF entity, where the handover policy is used to indicate that the terminal is in Switching from the first access network to the second access network when the specified time is reached; switching from the first access network to the second access network according to the handover policy. Preferably, the handover policy includes: a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal switches from the first access network to the second access network, The duration is used to trigger the terminal to perform handover of the access network when the timing of the timer reaches the specified time. Preferably, the first access network is a non-3rd generation partnership plan 3GPP access network, and the second access network is a 3GPP access network. Preferably, the non-3GPP access network comprises: a wireless local area network WLAN; the 3GPP access network comprises: an evolved universal mobile communication system terrestrial radio access network E-UTRAN. Preferably, before receiving the handover policy from the ANDSF entity, the method includes: sending a request message to the ANDSF entity, where the request message is used to request the ANDSF entity to send the handover policy to the terminal. Preferably, before receiving the handover policy from the ANDSF entity, the method includes: the ANDSF entity actively sending the handover policy to the terminal. According to another embodiment of the present invention, a handover processing method for a radio access network is provided, which is applied to an ANDSF entity, including: acquiring a handover policy, where the handover policy is used to indicate that the terminal arrives at a specified time Switching from the first access network to the second access network; transmitting the handover policy to the terminal according to a predetermined rule. Preferably, the handover policy includes: a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal switches from the first access network to the second access network, The duration is used to trigger the terminal to perform handover of the access network when the timing of the timer reaches the specified time. Preferably, the first access network is a non-3rd generation partnership plan 3GPP access network, and the second access network is a 3GPP access network. Preferably, the predetermined rule includes one of: receiving a request message from the terminal, sending the handover policy to the terminal, triggered by the request message; the ANDSF entity actively sending the message to the terminal The switching policy. According to still another embodiment of the present invention, a switching apparatus for a radio access network is provided, which is applied to a terminal, where the apparatus includes: a receiving module, configured to receive a handover policy from an ANDSF entity, where the handover policy is used by Instructing the terminal to switch from the first access network to the second access network when the specified time is reached; the handover module is configured to switch from the first access network to the second access according to the handover policy network. Preferably, the receiving module is configured to receive the switching policy that includes: a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal is from the first access network Switching to the second access network, the duration is used to trigger the terminal to perform handover of the access network when the timing of the timer reaches the specified time. According to still another embodiment of the present invention, a handover processing apparatus for a radio access network is provided, which is applied to an ANDSF entity, and the apparatus includes: an acquisition module, configured to acquire a handover policy, where the handover policy is used to indicate The terminal switches from the first access network to the second access network when the specified time is reached; the sending module is configured to send the switching policy to the terminal according to a predetermined rule. Preferably, the acquiring module is configured to obtain the switching policy that includes the following: a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal is from the first access Net cut Switching to the second access network, the duration is used to trigger the terminal to perform handover of the access network when the timing of the timer reaches the specified time. According to the embodiment of the present invention, a technical means for indicating a handover policy of the terminal to switch from the first access network to the second access network when the terminal arrives at the specified time is sent to the terminal by the ANDSF entity, and the related art is When the radio access network is switched, there are technical problems such as ping-pong effect, thereby effectively avoiding the ping-pong effect in the process of the terminal accessing the radio access network, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic structural diagram of a 3GPP access system and a non-3GPP access system accessing an EPS according to the related art; FIG. 2 is a schematic diagram of a CSFB functional architecture according to the related art; FIG. 3 is an ANDSF according to the related art. 4 is a schematic diagram of a ping-pong handover according to the related art; FIG. 5 is a flowchart of a method for handover of a radio access network according to Embodiment 1 of the present invention; FIG. 6 is a diagram of a radio according to Embodiment 1 of the present invention; FIG. 7 is a flowchart of a method for processing a radio access network according to Embodiment 2 of the present invention; FIG. 8 is a diagram of a handover processing apparatus for a radio access network according to Embodiment 2 of the present invention; FIG. 9 is a flowchart of a CSFB tangential WLAN returning to E-UTRAN through timer control according to Embodiment 3 of the present invention; FIG. 10 is a traversal WLAN timer control of a normal PS service according to Embodiment 4 of the present invention; Return to the flow chart of E-UTRAN. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. For the related art, the ping-pong effect problem occurs when the terminal performs the access selection or the handover of the radio access network. The embodiment of the present invention provides a corresponding solution, which is described in detail below. Embodiment 1 The handover method in this embodiment is applied to a terminal. FIG. 5 is a flowchart of a method for handover of a radio access network according to Embodiment 1 of the present invention. As shown in FIG. 5, the method includes: Step S502: Receive a handover policy from an ANDSF entity, where the handover policy is used to indicate that a terminal switches from a first access network to a second access network when a specified time is reached; Step S504, switching from the first access network to the second access network according to the handover policy. Through the foregoing processing steps, the time information for switching from the first access network to the second access network is carried in the handover policy indicated by the ANDSF entity to the terminal, that is, the ANDSF entity instructs the terminal to perform the handover timing of the radio access network, The ping-pong effect problem caused by the terminal automatically switching according to the priority of the radio access network in the related art can be avoided, thereby improving the service experience of the UE, thereby improving the user experience. In this embodiment, the foregoing switching policy may be implemented in multiple manners, for example, by directly indicating a switching opportunity by using a specified field, or by notifying the UE to set a timer. For the second implementation manner, the following manner may be implemented. The foregoing switching policy includes: a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal switches from the first access network to the second access network, and the duration is used for timing of the timer. When the specified time is reached, the terminal is triggered to perform switching of the access network. The foregoing first access network may include, but is not limited to: a non-3GPP access network, where the second access network includes but is not limited to a 3GPP access network. At this time, the foregoing non-3GPP access network includes: WLAN; the 3GPP access network includes: E-UTRAN. In this embodiment, the manner in which the ANDSF sends the foregoing switching policy to the terminal may be in a PULL mode or a PUSH mode, where the PULL mode may be implemented in the following manner: Before receiving the foregoing switching policy from the ANDSF entity, to the ANDSF The entity sends a request message, where the request message is used to request the ANDSF entity to send a handover policy to the terminal. The PUSH mode can be implemented in the following manner: Before receiving the handover policy from the ANDSF entity, the ANDSF entity actively sends the handover policy to the terminal. In this embodiment, a switching device for a radio access network is also provided. The device is applied to the terminal, but the device is not limited thereto. The device is used to implement the foregoing embodiment and the preferred embodiment. The following describes the modules involved in the device. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable. FIG. 6 is a structural block diagram of a switching apparatus of a radio access network according to Embodiment 1 of the present invention. As shown in FIG. 6, the apparatus includes: a receiving module 60, connected to the switching module 62, configured to receive a handover policy from an ANDSF entity, where the handover policy is used to indicate that the terminal accesses the first access network when the specified time is reached. Switching to the second access network; the switching module 62 is configured to switch from the first access network to the second access network according to the foregoing handover policy. Through the functions implemented by the above modules, the ping-pong effect caused by the terminal automatically switching according to the priority of the radio access network in the related art can also be avoided. In this embodiment, the receiving module 60 is configured to receive a switching policy that includes: a timer type and a duration corresponding to the timer, where the timer type is used to instruct the terminal to switch from the first access network to the second The access network is configured to trigger the terminal to perform handover of the access network when the timing of the timer reaches a specified time. It should be noted that each of the above modules may be implemented by one processor or two processors in the terminal when implementing the respective functions, and may be the above two processing modules and two processings when implemented by two processors. The devices correspond one by one. Embodiment 2 This embodiment will be described on the side of the ANDSF entity. FIG. 7 is a flowchart of a handover processing method of a radio access network according to Embodiment 2 of the present invention. As shown in FIG. 7, the method includes: Step S702: Acquire a handover policy, where the handover policy is used to indicate that the terminal switches from the first access network to the second access network when the specified time is reached; Step S704, according to the reservation The rule sends the above switching policy to the terminal. Corresponding to the embodiment shown in FIG. 5, through the above processing steps, the ping-pong effect problem caused by the terminal automatically switching according to the priority of the radio access network in the related art can also be avoided. In this embodiment, the foregoing switching policy includes, but is not limited to, a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal switches from the first access network to the second access network, and the duration is used. The terminal is triggered to perform switching of the access network when the timing of the timer reaches the specified time. In this embodiment, the first access network includes, but is not limited to, a non-3GPP access network, and the second access network is a 3GPP access network. In this embodiment, the foregoing predetermined rule includes one of the following: receiving a request message from the terminal, and sending a handover policy to the terminal, triggered by the request message; and the ANDSF entity actively sending the handover policy to the terminal. That is, the method of active transmission and passive transmission can be adopted. In this embodiment, a switching processing apparatus for a radio access network is further applied to an ANDSF entity. As shown in FIG. 8, the apparatus includes: an obtaining module 80, connected to the sending module 82, configured to acquire a switching policy. The handover policy is used to indicate that the terminal switches from the first access network to the second access network when the specified time is reached. The sending module 82 is configured to send the handover policy to the terminal according to a predetermined rule. In this embodiment, the obtaining module 80 is configured to obtain a switching policy that includes: a timer type and a duration corresponding to the timer, where the timer type is used to indicate that the terminal switches from the first access network to the first In the second access network, the duration is used to trigger the terminal to perform handover of the access network when the timer reaches the specified time. It should be noted that, when implementing the respective functions, each of the above modules may be implemented by one processor or two processors in the ANDSF entity, and when implemented by two processors, may be the above two processing modules and two Each processor corresponds to one by one. In order to better understand the above embodiments, the following detailed description will be made in conjunction with Embodiment 3-4 and related drawings. Embodiment 3 This embodiment is described by taking an example of the CSFB tangential WLAN returning to the E-UTRAN through the timer control. As shown in FIG. 9, the handover scheme in this embodiment includes the following processing steps: Step S902: The UE initiates the CS domain. The process of calling and establishing a data connection over a WLAN is prior art. In step S904, when the UE starts to initiate the handover to the WLAN, in this embodiment, the UE sends a cross-system handover waiting timer request message to the ANDSF, and carries the initial 3GPP radio access type of the UE, where E-UTRAN is carried. The current access technology of the UE, here WLAN. Step S906, the ANDSF returns a cross-system handover waiting timer response message to the UE, with the type of the cross-system handover waiting timer, and the duration corresponding to the timer. The type of this timer is WLAN return E-UTRAN wait timer. Since the operator usually wants the UE to camp on the WLAN instead of the E-UTRAN for as long as possible to reduce the traffic load of the operator, the duration value of the timer can be set to a medium threshold or a maximum threshold. For example, the duration of the timer can range from 0 to 1800 seconds. You can set the default value to 900 seconds or 1800 seconds. The manner in which the UE triggers to acquire the duration of the cross-system handover waiting timer is the PULL mode. Optionally, the ANDSF may also adopt a PUSH mode to actively provide the UE with a cross-system handover waiting timer duration. Step S908, the UE stores the duration of the WLAN returning to the E-UTRAN waiting timer in the cross-system handover waiting timer response message, and sets a waiting timer for returning from the WLAN to the E-UTRAN. Step S910, when the WLAN returns to the E-UTRAN waiting timer is still running, the UE continues to camp on the WLAN. Step S912, when the WLAN returns to the E-UTRAN waiting timer expires, the UE initiates a tracking area update (Tracking Area Update, Referred to as TAU) request message, return to E-UTRAN. Embodiment 4 This embodiment is described by taking an example of a normal PS service tangential WLAN returning E-UTRAN through timer control. As shown in FIG. 10, the method includes: Step S1002: The UE initiates from E-UTRAN to UTRAN/GERAN The IRAT handover is tangential to the WLAN according to the ANDSF policy, which is prior art. In step S1004, when the UE starts to initiate handover to the WLAN, in the present invention, the UE sends a cross-system handover waiting timer request message to the ANDSF, and carries the initial 3GPP radio access type of the UE, here E-UTRAN, with the UE Current access technology, here WLAN. Step S1006: The ANDSF returns a cross-system handover waiting timer response message to the UE, with the type of the cross-system handover waiting timer, and the duration corresponding to the timer. The type of the timer is WLAN return E-UTRAN wait timer Since the operator usually wants the UE to camp on the WLAN instead of the E-UTRAN for as long as possible to reduce the traffic load of the operator, the duration value of the timer can be set to a medium threshold or a maximum threshold. For example, the duration of the timer can range from 0 to 1800 seconds. You can set the default value to 900 seconds or 1800 seconds. The manner in which the UE triggers to acquire the duration of the cross-system handover waiting timer is the PULL mode. Optionally, the ANDSF may also adopt a PUSH mode to actively provide the UE with a cross-system handover waiting timer duration. Step S1008: The UE stores the duration of the WLAN returning to the E-UTRAN waiting timer in the cross-system handover waiting timer response message, and sets a waiting timer for returning from the WLAN to the E-UTRAN. Step S1010: When the WLAN returns to the E-UTRAN wait timer is still running, the UE continues to camp on

WLANo Step S1012: When the WLAN returns to the E-UTRAN wait timer expires, the UE initiates a process of switching from the WLAN to the lj E-UTRAN. In another embodiment, software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments. In another embodiment, a storage medium is provided, the software being stored, including but not limited to: an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention. Industrial Applicability The foregoing technical solution provided by the embodiments of the present invention may be applied to a handover process of a radio access network, and the ANDSF entity sends an indication to the terminal to instruct the terminal to switch from the first access network to the first time when the specified time is reached. The technical means of the switching strategy of the two access networks solves the technical problems such as the ping-pong effect when the radio access network is switched in the related art, thereby effectively avoiding the process of the terminal accessing the radio access network. The ping-pong effect enhances the user experience.

Claims

Claim

A method for switching a radio access network, which is applied to a terminal, and includes:

Receiving a handover policy from the access network discovery and selection function ANDSF entity, where the handover policy is used to indicate that the terminal switches from the first access network to the second access network when the specified time is reached;

Switching from the first access network to the second access network according to the handover policy.

2. The method according to claim 1, wherein the switching policy comprises:

a timer type and a duration of the timer, where the timer type is used to indicate that the terminal switches from the first access network to the second access network, and the duration is used in the timing. When the timing of the device reaches the specified time, the terminal is triggered to perform switching of the access network.

The method according to claim 1, wherein the first access network is a non-3rd generation partnership plan 3GPP access network, and the second access network is a 3GPP access network.

4. The method according to claim 3, wherein the non-3GPP access network comprises: a wireless local area network WLAN; the 3GPP access network comprises: an evolved universal mobile communication system terrestrial radio access network E-UTRAN.

The method according to any one of claims 1 to 4, wherein before receiving the switching policy from the ANDSF entity, the method includes:

Sending a request message to the ANDSF entity, where the request message is used to request the ANDSF entity to send the handover policy to the terminal.

The method according to any one of claims 1 to 4, wherein, before receiving the switching policy from the ANDSF entity, the method comprises:

The ANDSF entity actively sends the handover policy to the terminal.

A handover processing method for a radio access network, which is applied to an access network discovery and selection function ANDSF entity, including:

Obtaining a handover policy, where the handover policy is used to indicate that the terminal switches from a first access network to a second access network when a specified time is reached;

The switching policy is sent to the terminal according to a predetermined rule.

The method according to claim 7, wherein the switching policy comprises:

9. The method according to claim 7, wherein the first access network is a non-3rd Generation Partnership Project 3GPP access network, and the second access network is a 3GPP access network.

The method according to any one of claims 7 to 9, wherein the predetermined rule comprises one of: receiving a request message from the terminal, and transmitting, to the terminal, a trigger message The switching strategy;

The ANDSF entity actively sends the handover policy to the terminal.

A switching device for a radio access network, which is applied to a terminal, and includes:

a receiving module, configured to receive a handover policy from an access network discovery and selection function ANDSF entity, where the handover policy is used to indicate that the terminal switches from a first access network to a second access when a specified time is reached network;

And a switching module, configured to switch from the first access network to the second access network according to the handover policy.

12. The apparatus of claim 11, wherein the receiving module is to receive the switching policy comprising:

A handover processing apparatus for a radio access network, which is applied to an access network discovery and selection function ANDSF entity, comprising:

An acquiring module, configured to acquire a handover policy, where the handover policy is used to indicate that the terminal switches from a first access network to a second access network when a specified time is reached;

And a sending module, configured to send the switching policy to the terminal according to a predetermined rule.

The device according to claim 13, wherein the acquiring module is configured to acquire the switching policy including: a timer type and a duration of the timer, where the timer type is used to indicate that the terminal switches from the first access network to the second access network, and the duration is used in the timing. When the timing of the device reaches the specified time, the terminal is triggered to perform switching of the access network.