CN107333303B - Network switching method and device for user terminal - Google Patents

Network switching method and device for user terminal Download PDF

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Publication number
CN107333303B
CN107333303B CN201610274367.1A CN201610274367A CN107333303B CN 107333303 B CN107333303 B CN 107333303B CN 201610274367 A CN201610274367 A CN 201610274367A CN 107333303 B CN107333303 B CN 107333303B
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network
user terminal
switching
target network
3gpp access
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CN107333303A (en
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钱民乾
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H04W36/28—Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A network switching method and a device of a user terminal are provided, wherein the network switching method judges network environment information of the user terminal, when the network environment information simultaneously meets first condition information and second condition information, a first target network is determined according to the first condition information or the second condition information, whether network environment information related to the first target network still meets a switching strategy is judged, and IP services are switched according to a judgment result. The method and the device can coordinate two switching processes, avoid continuous switching of the IP service and further improve the processing efficiency of the IP service.

Description

Network switching method and device for user terminal
Technical Field
The present invention relates to the field of communications, and in particular, to a network switching method and apparatus for a user equipment.
background
A Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN) is an Access method of the third generation Mobile communication technology UMTS, and has a wide application range.
In a Long Term Evolution (Long Term Evolution, LTE, also known as 4G Network), because of the Evolution relationship, the Access Network part is usually called an Evolved UMTS terrestrial radio Access Network (E-UTRAN), i.e. a mobile communication wireless Network in LTE.
Both UTRAN and LTE belong to 3GPP access networks. A Wireless Local Area Network (WLAN) is an IP network, and can transmit data conveniently and efficiently. The IP services of the user terminal are IP-based services including data services, IMS voice/video services, etc.
In the prior art, the IP service of the user terminal may be switched between multiple 3GPP access networks, or between a 3GPP access network and a WLAN, but the two types of switching may conflict with each other, and the switching mechanism needs to be improved.
Disclosure of Invention
The invention solves the technical problem of avoiding IP service switching conflict and provides a new switching mechanism.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a network switching method for a user equipment, where the user equipment is located in a WLAN and multiple 3GPP access networks, and the user equipment performs an IP service in any 3GPP access network or WLAN in the multiple 3GPP access networks, and the method includes: acquiring network environment information of the user terminal, wherein the network environment information comprises first parameter information which needs to be judged when the user terminal is switched between various 3GPP access networks and second parameter information which needs to be judged when the user terminal is switched between any 3GPP access network and a WLAN; obtaining a switching strategy applicable to the user terminal, wherein the switching strategy comprises: the first network and the target network are both 3GPP access networks, and when the first network is switched to the target network, the first parameter information needs to meet the first condition information; the first network and the target network are any 3GPP access network and WLAN respectively, and the second parameter information needs to meet the second condition information when the first network is switched to the target network; taking a network of the user terminal for performing the IP service and a current resident network of the user terminal as the first network, and determining a first target network according to the first condition information or the second condition information when the first parameter information meets the first condition information and the second parameter information meets the second condition information; and judging whether the network environment information related to the first target network still meets the switching strategy if the first target network is taken as the first network, and switching the IP service according to the judgment result.
Optionally, the switching the IP service according to the determination result includes: and if the network environment information related to the first target network still meets the switching strategy, selecting a final target network according to the network environment information and the switching strategy, and switching the IP service to the final target network.
Optionally, a network of the user terminal performing the IP service is a 3GPP access network, the first target network is another 3GPP access network, and if the first target network is used as the first network and the second parameter information meets the second condition information, the final target network is a WLAN.
Optionally, a network of the user terminal performing the IP service is a 4G network, the first target network is a 3G network, and the second condition information is condition information for switching from the 3G network to a WLAN.
Optionally, a network of the user terminal performing the IP service is a WLAN, the first target network is a 3GPP access network, and if the first target network is used as the first network and the first parameter information meets the first condition information, the 3GPP access network to which the first parameter information needs to be switched after meeting the first condition information is the final target network.
Optionally, the first target network is a 4G network, the current residing network is a 4G network, the first parameter information satisfies first condition information for switching from the 4G network to the 3G network, and the final target network is the 3G network.
Optionally, the switching the IP service according to the determination result includes: and if the network environment information related to the first target network does not meet the switching strategy, switching the IP service to the first target network.
The embodiment of the present invention further provides a network switching device of a user terminal, where the user terminal is located in a WLAN and multiple 3GPP access networks, and the user terminal performs an IP service in any 3GPP access network or WLAN in the multiple 3GPP access networks, and the network switching device includes: a network environment information obtaining unit, adapted to obtain network environment information where the user terminal is located, where the network environment information includes first parameter information that needs to be determined when the user terminal is switched between multiple 3GPP access networks, and second parameter information that needs to be determined when the user terminal is switched between any 3GPP access network and a WLAN; a handover policy obtaining unit, adapted to obtain a handover policy applicable to the ue, where the handover policy includes: the first network and the target network are both 3GPP access networks, and when the first network is switched to the target network, the first parameter information needs to meet the first condition information; the first network and the target network are any 3GPP access network and WLAN respectively, and the second parameter information needs to meet the second condition information when the first network is switched to the target network; a first target network determining unit, adapted to use a network where the user terminal performs the IP service or a current resident network of the user terminal as the first network, and determine a first target network according to the first condition information or the second condition information when the first parameter information satisfies the first condition information and the second parameter information satisfies the second condition information; and the switching control unit is suitable for judging whether the network environment information related to the first target network still meets the switching strategy if the first target network is taken as the first network, and switching the IP service according to the judgment result.
Optionally, the handover control unit is adapted to select a final target network according to the network environment information and the handover policy when the network environment information related to the first target network still satisfies the handover policy, and handover the IP service to the final target network.
Optionally, a network of the user terminal performing the IP service is a 3GPP access network, the first target network is another 3GPP access network, and if the first target network is used as the first network and the second parameter information meets the second condition information, the final target network is a WLAN.
optionally, a network of the user terminal performing the IP service is a 4G network, the first target network is a 3G network, and the second condition information is condition information for switching from the 3G network to a WLAN.
optionally, a network of the user terminal performing the IP service is a WLAN, the first target network is a 3GPP access network, and if the first target network is used as the first network and the first parameter information meets the first condition information, the 3GPP access network to which the first parameter information needs to be switched after meeting the first condition information is the final target network.
Optionally, the first target network is a 4G network, the current residing network is a 4G network, the first parameter information satisfies first condition information for switching from the 4G network to the 3G network, and the final target network is the 3G network.
Optionally, the handover control unit is adapted to handover the IP service to the first target network when the network environment information related to the first target network does not satisfy the handover policy.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
The method comprises the steps of judging network environment information of a user terminal, when the network environment information meets first condition information and second condition information at the same time, switching IP services of the user terminal between 3GPP access networks and between the 3GPP network and a WLAN, and at the moment, switching conflict possibly occurs, so that a first target network is determined according to the first condition information or the second condition information, whether network environment information related to the first target network still meets a switching strategy is judged, the IP services are switched according to a judgment result, two switching processes can be coordinated, continuous switching of the IP services is avoided, and processing efficiency of the IP services is improved.
Drawings
fig. 1 is a flowchart of a network handover method of a ue in an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a network switching apparatus of a ue in an embodiment of the present invention.
Detailed Description
As mentioned above, the IP service of the user terminal can be switched between various 3GPP access networks (for example, switching between a 3G network and a 4G network), and also can be switched between a 3GPP access network and a WLAN, but when two types of handovers are simultaneously possible, a conflict may occur, and a continuous handover occurs, for example: when the IP service of the user terminal simultaneously meets the conditions of switching from the 4G network to the 3G network and switching from the 4G network to the WLAN, the IP service may be switched to the 3G network, and the IP service is switched to the WLAN again after the IP service is judged to meet the conditions of switching from the 3G network to the WLAN. The continuous handover situation results in low IP service processing efficiency and waste of terminal resources, so the handover mechanism needs to be improved.
In the embodiment of the invention, by judging the network environment information of the user terminal, when the network environment information simultaneously meets the first condition information and the second condition information, the IP service of the user terminal can be switched between 3GPP access networks and between the 3GPP network and a WLAN, and the problem of switching conflict can occur at the moment, so that the first target network is determined according to the first condition information or the second condition information, whether the network environment information related to the first target network still meets the switching strategy is judged, and the IP service is switched according to the judgment result, so that the two switching processes can be coordinated, the continuous switching of the IP service is avoided, and the processing efficiency of the IP service is improved.
in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a network handover method of a ue in an embodiment of the present invention.
The user terminal is located in the WLAN and various 3GPP access networks (e.g. 3G network, 4G network), and performs IP services in any 3GPP access network or WLAN in the various 3GPP access networks, and the network handover method may include:
Step S11: and acquiring network environment information of the user terminal, wherein the network environment information comprises first parameter information which needs to be judged when the user terminal is switched between various 3GPP access networks and second parameter information which needs to be judged when the user terminal is switched between any 3GPP access network and a WLAN.
The network environment information may include network information of a plurality of 3GPP access networks and WLANs in which the user terminal is located, first parameter information that needs to be determined when the user performs handover between the plurality of 3GPP access networks, and second parameter information that needs to be determined when the user terminal performs handover between any one of the 3GPP access networks and the WLAN, may be determined by a handover policy applicable to the user terminal.
the network environment information may generally include information of a plurality of 3GPP access networks in which the user terminal is located, and signal strength information of the WLAN, where the information of the plurality of 3GPP access networks includes both a currently camped 3GPP access network and a non-camped 3GPP access network; the network environment information may also include access technology type of the access network, WLAN ID, etc. The information related to the 3GPP access network in the network environment information can be provided by the network side to the user terminal.
Step S12: obtaining a switching strategy applicable to the user terminal, wherein the switching strategy comprises: the first network and the target network are both 3GPP access networks, and when the first network is switched to the target network, the first parameter information needs to meet the first condition information; and the first network and the target network are any 3GPP access network and WLAN respectively, and the second parameter information needs to meet the second condition information when the first network is switched to the target network.
The handover policy may include a policy for specifying a handover of the IP service of the user terminal between different 3GPP access networks and a policy for a handover of the IP service of the user terminal between a 3GPP access network and a WLAN, and may also include a policy for a reselection and a handover of the user terminal between different access networks (a reselection or a handover between 3GPP heterogeneous systems).
The handover policy may be a handover policy specified by a protocol or may be a handover policy specified by an operator. For example, it is mentioned in protocols TS 24.312, TS 25.331 and TS 36.331 that the 3GPP RAN and ANDSF services can provide decision conditions for currently camped 3GPP access network and WLAN handover, such as WLAN ID, various types of thresholds, etc. Accordingly, the user terminal can obtain the protocol-related handover policy from the network side and obtain the handover policy specified by the operator from the operator. The user terminal may multiplex different criteria for the handover strategy.
In the prior art, protocols TS 24.312, TS 25.331 and TS 36.331 are specified in versions before release 12, IP traffic switching is controlled by the user terminal, and in release 13, IP traffic switching can be controlled by the network side; the reselection between different 3GPP access networks is that a user terminal judges according to the conditions of signal strength, priorities, thresholds and the like of different 3GPP access networks and is controlled and triggered by the user terminal; the switching is controlled and triggered by the network side after the user terminal reports the measurement and report of each access network.
it can be seen that, currently, the decision manners for the handover of the resident network between different 3GPP networks and the handover of the IP service between the 3GPP and the WLAN are different, and the controllers are not unified, and a reselection/handover conflict of the IP service from the WLAN to the 3GPP and a different 3GPP access network occurs, or a conflict of the IP service from the 3GPP to the WLAN and to another 3GPP access network occurs.
Step S13: and taking the network of the user terminal for carrying out the IP service and the current resident network of the user terminal as the first network, and determining a first target network according to the first condition information or the second condition information when the first parameter information meets the first condition information and the second parameter information meets the second condition information.
When the first parameter information satisfies the first condition information and the second parameter information satisfies the second condition information, a reselection/handover collision of the aforementioned IP traffic from the WLAN to the 3GPP and a different 3GPP access network or a handover collision of the IP traffic from the 3GPP to the WLAN and to another 3GPP access network may occur.
Step S14: and judging whether the network environment information related to the first target network still meets the switching strategy if the first target network is taken as the first network, and switching the IP service according to the judgment result.
as described above, the handover policy may include a policy for specifying that the IP traffic of the user terminal is handed over between different 3GPP access networks and a policy for switching the IP traffic of the user terminal between the 3GPP access network and the WLAN, and may also include a policy for performing reselection and handover between different access networks (reselection and handover between 3GPP heterogeneous systems) for the user terminal. When the first parameter information meets the first condition information and the second parameter information meets the second condition information, it indicates that the user terminal simultaneously meets at least two of the handover strategies, and there are multiple handover modes, and at this time, if one of the handover modes is selected for handover, the network to which the handover is performed may still meet the handover strategies, thereby causing occurrence of continuous handover and affecting processing efficiency of the IP service.
Therefore, when the network to be switched to is used as the first target network, whether the network environment information related to the first target network still meets the switching strategy is judged if the first target network is used as the first network, and the IP service is switched according to the judgment result, so that the continuous switching of the IP service can be avoided, the processing efficiency of the IP service can be further improved, and meanwhile, the resources of the user terminal can be saved by avoiding the continuous switching.
In a specific implementation, the first target network may be a target network to which any of the foregoing handover manners are directed, for example: when the IP service is accessed through a 3GPP network, and the switching strategy for switching the IP service to other 3GPP access networks is met, and the switching strategy for switching the IP service to a WLAN is also met, the other 3GPP access networks or the WLAN to be switched to can be used as a first target network; when the IP service is accessed through the WLAN and meets the condition for switching the IP service to the 3GPP access network and the user terminal also meets the condition for switching the currently camped network, the 3GPP access network to which the IP service is to be switched or the 3GPP access network to which the currently camped network is to be switched may be selected as the first target network.
If the first target network is taken as the first network, there are two results in determining whether the first target network satisfies the handover policy, which are described below:
In a specific implementation, a first target network is used as a first network to determine whether a handover policy is satisfied, and if it is found through the determination that network environment information related to the first target network still satisfies the handover policy, a final target network is selected according to the network environment information and the handover policy, and the IP service is handed over to the final target network.
In an embodiment of the present invention, when the IP service is accessed through the 3GPP network and satisfies the handover policy for switching the IP service to other 3GPP access networks and also satisfies the handover policy for switching the IP service to the WLAN, the other 3GPP access network to be switched to is taken as the first target network, and it is found through the judgment that if the other 3GPP network to be switched to is taken as the first target network, the second parameter information of the first target network still satisfies the second condition information in the handover policy, and the IP service can be switched to the WLAN, and finally the target network is the WLAN, and the IP service is switched to the WLAN.
Specifically, in a non-limiting example, the user terminal accesses the IP service through the 4G network, and simultaneously satisfies the handover policies for switching the IP service to the 3G network and switching the IP service to the WLAN, and the selected first target network is the 3G network, and after determining that the 3G network is the first network, the handover policy for switching the IP service to the WLAN is still satisfied, so that the WLAN is used as the final target network, and the IP service is switched to the WLAN.
In another embodiment of the invention, the user terminal accesses the IP service through the WLAN, and meets the switching strategy of switching the IP service to the 3GPP access network, and simultaneously, the user terminal also meets the switching strategy of the current resident network; at this time, if the 3GPP access network (usually, the currently-camped network) to which the IP service is to be switched is used as the first target network, and the first target network is used as the first network to perform the determination, and the network environment information of the first target network still satisfies the first condition information in the switching policy, the 3GPP access network to which the IP service is to be switched after satisfying the first condition information is used as the final target network, and the IP service is switched to the 3GPP network.
Specifically, in a non-limiting example, the user terminal accesses the IP service through the WLAN, and satisfies a handover policy of switching the IP service to the 4G network, and at the same time, the user terminal satisfies a handover policy of switching the current resident network to the 3G network, and at this time, if the first target network is the 4G network, after the IP service is judged to be switched to the first target network, the network environment information of the first target network still satisfies the handover policy of switching to the 3G network, so the 3G network is used as a final target network, and reselection or handover between different 3GPP systems is triggered first, the current resident network is switched from the 4G network to the 3G network, and then the IP service is triggered to be switched to the 3G network.
In specific implementation, when the network environment information of the first target network meets the handover policy, the IP service is handed over to the first target network.
in an embodiment of the present invention, the user terminal accesses the IP service through the 4G network, and simultaneously satisfies the switching policy of switching the IP service to the 3G network and switching the IP service to the WLAN, and the selected first target network is the WLAN, and after judgment, if the WLAN is used as the first network, the switching policy of switching the IP service to the 3G network is not satisfied, so the WLAN is used as the final target network.
in another embodiment of the present invention, the user terminal accesses the IP service through the WLAN, and satisfies a handover policy for switching the IP service to the 4G network, and at the same time, the user terminal satisfies a handover policy for switching the current resident network to the 3G network, and at this time, if the first target network is the 3G network, after the IP service is switched to the first target network by the judgment, the network environment information of the first target network does not satisfy the handover policy, so the 3G network is taken as the final target network.
It is understood that the judgment whether the environment information of the first target network satisfies the handover policy depends on the handover policy acquired in step S11.
In the prior art, a network side usually only issues a handover strategy for performing handover between a currently-resident 3GPP network and a WLAN; in the embodiment of the present invention, the network side issues to the user terminal all handover strategies that may be applicable to the user terminal, including handover strategies between each of the plurality of 3GPP access networks where the user terminal is located, and handover strategies between each of the 3GPP access networks and the WLAN, but not limited to the handover strategy for performing handover between the currently-resident network of the user terminal and the WLAN.
for example, when the ue resides in the 4G network, the ue is simultaneously located in the 3G network, and at this time, the network side issues a handover policy between the 4G network and the 3G network to the ue, and issues a handover policy for handover between the 4G network, the 3G network, and the WLAN. Therefore, the user terminal in the embodiment of the invention can perform more comprehensive judgment according to the switching strategy to determine the switching triggered first, thereby avoiding the continuous switching of the IP service and further improving the processing efficiency of the IP service.
The embodiment of the invention also provides a network switching device of the user terminal, and the structural schematic diagram of the network switching device is shown in fig. 2.
The user terminal in the embodiment of the invention is positioned in a WLAN and a plurality of 3GPP access networks, the user terminal carries out IP service in any 3GPP access network or the WLAN in the plurality of 3GPP access networks, and the network switching device comprises:
A network environment information obtaining unit 21, adapted to obtain network environment information where the user terminal is located, where the network environment information includes first parameter information that needs to be determined when the user terminal is switched between multiple 3GPP access networks, and second parameter information that needs to be determined when the user terminal is switched between any 3GPP access network and a WLAN;
A handover policy obtaining unit 22, adapted to obtain a handover policy applicable to the ue, where the handover policy includes: the first network and the target network are both 3GPP access networks, and when the first network is switched to the target network, the first parameter information needs to meet the first condition information; the first network and the target network are any 3GPP access network and WLAN respectively, and the second parameter information needs to meet the second condition information when the first network is switched to the target network;
A first target network determining unit 23, adapted to use a network where the user terminal performs the IP service or a current resident network of the user terminal as the first network, and determine a first target network according to the first condition information or the second condition information when the first parameter information satisfies the first condition information and the second parameter information satisfies the second condition information;
The handover control unit 24 is adapted to determine whether the network environment information related to the first target network still satisfies the handover policy if the first target network is used as the first network, and handover the IP service according to the determination result.
In a specific implementation, the handover control unit 24 is adapted to select a final target network according to the network environment information and the handover policy when the network environment information related to the first target network still satisfies the handover policy, and handover the IP service to the final target network.
in a specific implementation, a network where the user terminal performs the IP service is a 3GPP access network, the first target network is another 3GPP access network, and if the first target network is used as the first network and the second parameter information satisfies the second condition information, the final target network is a WLAN.
In a specific implementation, the network where the user terminal performs the IP service is a 4G network, the first target network is a 3G network, and the second condition information is condition information for switching from the 3G network to a WLAN.
in a specific implementation, a network where the user terminal performs the IP service is a WLAN, the first target network is a 3GPP access network, and if the first target network is taken as a first network and the first parameter information satisfies the first condition information, the 3GPP access network to which switching is required after the first condition information is satisfied is the final target network.
In specific implementation, the first target network is a 4G network, the current residing network is a 4G network, the first parameter information satisfies first condition information for switching from the 4G network to the 3G network, and the final target network is the 3G network.
In a specific implementation, the handover control unit 24 is adapted to handover the IP traffic to the first target network when the network environment information related to the first target network does not satisfy the handover policy.
The specific implementation of the network switching device of the user terminal in the embodiment of the present invention may refer to the network switching method of the user terminal, which is not described in detail.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A network switching method of a user terminal is characterized in that the user terminal is positioned in a WLAN and a plurality of 3GPP access networks, the user terminal carries out IP service in any 3GPP access network or the WLAN in the plurality of 3GPP access networks, the network switching method comprises the following steps:
Acquiring network environment information of the user terminal, wherein the network environment information comprises first parameter information which needs to be judged when the user terminal is switched between various 3GPP access networks and second parameter information which needs to be judged when the user terminal is switched between any 3GPP access network and a WLAN;
Obtaining a switching strategy applicable to the user terminal, wherein the switching strategy comprises: the first network and the target network are both 3GPP access networks, and when the first network is switched to the target network, the first parameter information needs to meet the first condition information; the first network and the target network are any 3GPP access network and WLAN respectively, and the second parameter information needs to meet the second condition information when the first network is switched to the target network;
Taking a network of the user terminal for performing the IP service as the first network, and determining a first target network according to the first condition information or the second condition information when the first parameter information meets the first condition information and the second parameter information meets the second condition information;
Judging whether the network environment information related to the first target network still meets the switching strategy if the first target network is taken as the first network, and switching the IP service according to the judgment result, wherein the judging step comprises the following steps: if the network environment information related to the first target network still meets the switching strategy, selecting a final target network according to the network environment information and the switching strategy, and switching the IP service to the final target network; and if the network environment information related to the first target network does not meet the switching strategy, switching the IP service to the first target network.
2. The method of claim 1, wherein a network over which the user terminal performs the IP service is a 3GPP access network, the first target network is another 3GPP access network, and if the first target network is a first network and the second parameter information satisfies the second condition information, the final target network is a WLAN.
3. The method according to claim 2, wherein the network over which the user terminal performs the IP service is a 4G network, the first target network is a 3G network, and the second condition information is condition information for switching from the 3G network to the WLAN.
4. The method of claim 1, wherein a network where the user terminal performs the IP service is a WLAN, the first target network is a 3GPP access network, and if the first target network is used as the first network and the first parameter information satisfies the first condition information, the 3GPP access network to which the user terminal needs to be switched after satisfying the first condition information is the final target network.
5. the method according to claim 4, wherein the first target network is a 4G network, the currently camped network is a 4G network, the first parameter information satisfies first condition information for switching from the 4G network to the 3G network, and the final target network is the 3G network.
6. A network switching apparatus of a user terminal, wherein the user terminal is located in a WLAN and a plurality of 3GPP access networks, and the user terminal performs an IP service in any 3GPP access network or the WLAN in the plurality of 3GPP access networks, the network switching apparatus comprising:
a network environment information obtaining unit, adapted to obtain network environment information where the user terminal is located, where the network environment information includes first parameter information that needs to be determined when the user terminal is switched between multiple 3GPP access networks, and second parameter information that needs to be determined when the user terminal is switched between any 3GPP access network and a WLAN;
A handover policy obtaining unit, adapted to obtain a handover policy applicable to the ue, where the handover policy includes: the first network and the target network are both 3GPP access networks, and when the first network is switched to the target network, the first parameter information needs to meet the first condition information; the first network and the target network are any 3GPP access network and WLAN respectively, and the second parameter information needs to meet the second condition information when the first network is switched to the target network;
A first target network determining unit, adapted to use a network where the user terminal performs the IP service as the first network, and determine a first target network according to the first condition information or the second condition information when the first parameter information satisfies the first condition information and the second parameter information satisfies the second condition information;
The handover control unit is adapted to determine whether network environment information related to a first target network still satisfies the handover policy if the first target network is used as the first network, and perform handover on the IP service according to a determination result, and includes: when the network environment information related to the first target network still meets the switching strategy, selecting a final target network according to the network environment information and the switching strategy, and switching the IP service to the final target network; and if the network environment information related to the first target network does not meet the switching strategy, switching the IP service to the first target network.
7. The apparatus of claim 6, wherein a network over which the ue performs the IP service is a 3GPP access network, the first target network is another 3GPP access network, and if the first target network is a first network and the second parameter information satisfies the second condition information, the final target network is a WLAN.
8. The apparatus of claim 7, wherein the network over which the user terminal performs the IP service is a 4G network, the first target network is a 3G network, and the second condition information is condition information for switching from the 3G network to a WLAN.
9. The apparatus of claim 6, wherein a network of the ue performing the IP service is a WLAN, the first target network is a 3GPP access network, and if the first target network is used as the first network and the first parameter information satisfies the first condition information, the 3GPP access network to which the ue needs to be switched after satisfying the first condition information is the final target network.
10. the apparatus of claim 9, wherein the first target network is a 4G network, the currently camped network is a 4G network, the first parameter information satisfies first condition information for switching from the 4G network to the 3G network, and the final target network is the 3G network.
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