WO2014161172A1 - 一种切换方法、基站及终端 - Google Patents

一种切换方法、基站及终端 Download PDF

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Publication number
WO2014161172A1
WO2014161172A1 PCT/CN2013/073701 CN2013073701W WO2014161172A1 WO 2014161172 A1 WO2014161172 A1 WO 2014161172A1 CN 2013073701 W CN2013073701 W CN 2013073701W WO 2014161172 A1 WO2014161172 A1 WO 2014161172A1
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WO
WIPO (PCT)
Prior art keywords
terminal
base station
access network
andsf
target access
Prior art date
Application number
PCT/CN2013/073701
Other languages
English (en)
French (fr)
Inventor
戴明增
郭轶
曾清海
张宏平
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380002674.9A priority Critical patent/CN104969622B/zh
Priority to PCT/CN2013/073701 priority patent/WO2014161172A1/zh
Publication of WO2014161172A1 publication Critical patent/WO2014161172A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Definitions

  • the present invention relates to the field of access network technologies, and in particular, to a handover method, a base station, and a terminal.
  • a handover method a base station
  • a terminal a terminal
  • BACKGROUND OF THE INVENTION With the development of the mobile Internet, the requirements for the quality of service and network speed that a cellular communication system can provide are becoming higher and higher. However, the explosive growth of data traffic has caused serious network congestion. To this end, cellular data is currently offloaded by multiple access networks. For example, LTE (Long Term Evolution) and WLAN (Wireless Local Area Networks). In order to make reasonable use of the network side resources and ensure the user's service experience, it is particularly important to select a suitable access network. However, in the prior art, there is no effective access network selection mechanism.
  • LTE Long Term Evolution
  • WLAN Wireless Local Area Networks
  • the embodiments of the present invention provide a handover method, a base station, and a terminal, which implement handover between terminals.
  • the technical solution adopted by the invention is:
  • the present invention provides a handover method, where the method includes:
  • the base station instructs the terminal to enable the access network discovery and selection function ANDSF, where the terminal acquires access network information by using the ANDSF, where the access network information includes candidate target access network information;
  • the base station Receiving, by the base station, the candidate target access network information sent by the terminal; and determining, by the base station, the target access network according to the candidate target access network information, and switching the terminal to the target access network .
  • the base station instructs the terminal to enable the ANDSF by using the indication message.
  • the method further includes: determining, by the base station, that the terminal is turned on according to at least one of the following conditions: An ANDSF: the load of the base station is greater than a first preset threshold or the moving speed of the terminal is lower than a second preset threshold; the base station determines, according to at least one of the following conditions, that the terminal keeps the ANDSF off. Status: The base station confirms that there is no switchable access network or the moving speed of the terminal is higher than a third preset threshold.
  • the method further includes: the base station receiving ANDSF information sent by the core network; and the base station further confirming, according to the ANDSF information, whether the indication is The terminal turns on the ANDSF.
  • the method further includes: the base station receiving a request sent by the terminal, where the request is used for The base station is requested to instruct the terminal to enable the ANDSF.
  • the base station and the target access network are base stations of a 3GPP network
  • the base station further sends at least one of the following to the target access network: the indication message; the ANDSF information.
  • the present invention provides a base station, including: an indication unit, configured to instruct a terminal to enable an access network discovery and selection function ANDSF, where the terminal acquires access network information by using the ANDSF, where the access The network information includes the candidate target access network information, the receiving unit, configured to receive the candidate target access network information sent by the terminal, and the switching unit, configured to determine, according to the candidate target access network information, the target access network And switching the terminal to the target access network.
  • the method further includes: a sending unit, configured to send an indication message to the terminal, where the indication message is used to indicate whether the terminal turns on the ANDSF.
  • the second possible implementation manner of the second aspect further includes: a processing unit, configured to determine, according to at least one of the following conditions, the terminal Turning on the ANDSF: the load of the base station is greater than the first preset threshold or the moving speed of the terminal is lower than the second preset threshold; or determining to indicate that the terminal keeps the ANDSF off according to at least one of the following conditions Status: It is confirmed that there is no switchable access network or the moving speed of the terminal is higher than the third preset threshold.
  • the receiving unit is further configured to receive ANDSF information sent by the core network, where the processing unit is further used Further confirming whether the terminal is instructed to turn on the ANDSF according to the ANDSF information.
  • the receiving unit is further configured to receive a request sent by the terminal, where the request is The requesting unit indicates that the terminal starts the ANDSF.
  • the sending unit is further configured to send the following at least one to the target access network: the indication message; the ANDSF information.
  • the present invention provides a handover method, including: the terminal starts an access network discovery and selection function ANDSF according to an indication of a base station; the terminal acquires access network information by using the ANDSF, where the access network information includes a candidate target Accessing the network information; the terminal transmitting the candidate target access network information to the base station; and the terminal switching to the target access network determined by the base station according to the candidate target access network information.
  • the terminal according to the indication of the base station, the access network discovery and selection function ANDSF, specifically: the terminal receiving the indication message sent by the base station, where the indication message is used by Instructing the terminal whether to enable the ANDSF; the terminal turning on the ANDSF according to the indication message.
  • the second aspect in the third aspect the method further includes: the terminal sending a request to the base station, where the request is used to request the base station to instruct the terminal to enable the ANDSF.
  • the indication message when the load of the base station is greater than a first preset threshold or When the moving speed of the terminal is lower than the second preset threshold, the indication message is used to indicate that the terminal turns on the ANDSF; when the base station confirms that there is no handover of the target access network or the terminal When the speed is higher than the third preset threshold, the indication message is used to indicate that the terminal maintains the closed state of the ANDSF.
  • the indication message is generated by the base station according to the ANDSF information sent by the core network.
  • the present invention provides a terminal, including: an opening unit, configured to enable an access network discovery and selection function ANDSF according to an indication of a base station, and an acquiring unit, configured to acquire access network information by using the ANDSF, where the The network access information includes the candidate target access network information, the sending unit, configured to send the candidate target access network information to the base station, and the switching unit, configured to switch to the base station according to the candidate target access network.
  • Target access network In a first possible implementation manner of the fourth aspect, the method further includes: a receiving unit, configured to receive an indication message sent by the base station, where the indication message is used to indicate whether the terminal turns on an ANDSF.
  • the sending unit is further configured to send a request to the base station, where The request is for requesting the base station to instruct the terminal to enable the ANDSF.
  • the indication message is used to indicate that the terminal turns on the ANDSF; when the base station confirms that there is no switchable access network or the terminal has a higher transfer speed
  • the third indication threshold is used to indicate that the terminal keeps the OFF state of the ANDSF.
  • the indication message is generated by the base station according to the ANDSF information sent by the core network.
  • FIG. 1 is a flowchart of a base station side method according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of a second base station according to a second embodiment of the present invention
  • FIG. 3 is a flowchart of a method for a terminal side according to a third embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a hardware structure of a base station according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a hardware structure of a terminal according to an embodiment of the present invention.
  • the Access Network Discovery and Selection Function enables the terminal to scan the corresponding access network under the control of the base station, and determines the target access network to be switched by the terminal through the base station.
  • the present invention realizes the control of the terminal by the base station, and improves the controllability of the terminal.
  • ANDSF is a concept introduced by the core network, including data management and control functions.
  • the network is scanned according to the ANDSF information obtained from the core network to obtain available access network information.
  • the ANDSF information includes:
  • Inter-system mobility policy is a set of operator-defined rules and preferences that influence the mobility decisions between systems.
  • the inter-system mobility policy may include at least one of the following: a) a priority between systems, such as LTE having a higher priority than a WLAN. b) Priorities of different networks within the system, such as WLAN SSID-1 prior to WLAN SSID-2. c) Whether inter-system mobility is allowed, such as whether to allow handover from LTE to WLAN, or to allow handover from LTE to WLAN under certain conditions. d) Valid conditions, ie conditions that indicate the effectiveness of the inter-system mobility strategy, such as effective time and location.
  • the ANDSF information can provide a list of valid access networks around the UE, and the list includes various access network technologies.
  • Effective access technology information includes access technology types (such as WLAN, WiMAX) and wireless access networks.
  • Identifier such as the SSID of the WLAN.
  • the UE shall retain and use the access network information provided by these ANDSFs until the next update information is received.
  • ANDSF may provide inter-system routing information, ie different services can be accessed in different systems.
  • the UE may select different services to access different systems.
  • the existing ANDSF information is mainly defined by the operator in the core network according to the user's subscription information and historical statistical information. The information does not accurately consider the access network information, and does not guarantee the authenticity and reliability of the access network information, so the user equipment When using the ANDSF, it is necessary to scan in advance to obtain information on the available access network.
  • FIG. 1 is a schematic diagram of a handover method according to Embodiment 1 of the present invention, where the method specifically includes:
  • the base station instructs the terminal to enable the access network discovery and selection function ANDSF.
  • the terminal performs network scanning to obtain access network information only when receiving an indication of the base station's opening access network discovery and selection function.
  • the terminal acquires access network information by using the ANDSF, where the access network information includes candidate target access network information.
  • the access network information obtained by the scanning includes access network information that can be used for subsequent handover, that is, candidate target access network information.
  • the base station instructs the terminal to turn on the ANDSF by sending an indication message indicating whether the terminal turns on the ANDSF.
  • the base station can send the indication message to the terminal in the following two ways: Mode 1: The base station broadcasts a system message indicating whether the terminal turns on the ANDSF.
  • the base station can broadcast a Boolean type indication, and when the terminal is allowed to turn on the ANDSF, set its value to "ture”. When the terminal is not allowed to turn on the ANDSF, set its value to "flase”.
  • Manner 2 The base station receives a request sent by the terminal for requesting the base station to instruct the terminal to enable the ANDSF. The base station sends an indication message to the terminal according to the above request.
  • the terminal may send the foregoing request by using a radio resource control protocol (Radio Resource Control, RRC), and the corresponding base station may send an indication that the terminal is allowed to enable the ANDSF by using an RRC message.
  • RRC Radio Resource Control
  • the base station may indicate a Boolean type indication in the RRC message, and set the value to "ture” when the terminal is allowed to enable the ANDSF, and set the value to "flase,” when the terminal is not allowed to enable the ANDSF. .
  • the base station receives the candidate target access network information that is sent by the terminal.
  • the terminal starts the ANDSF according to the indication of the base station, performs network scanning to obtain the access network information, and determines the qualified access network as the candidate target access network.
  • the candidate target access network information includes at least a network name of the candidate target access network.
  • the candidate target access network information may further include a signal quality corresponding to each candidate target access network and/or a priority of each candidate target access network and/or a bearer information determined by the terminal to switch to the candidate target access network.
  • bearer identification DRB ID
  • the base station determines a target access network according to the candidate target access network information, and switches the terminal to the target access network.
  • the base station may determine the target access network according to the signal quality in the candidate target access network information, such as selecting the target access network with the best signal quality.
  • the base station may also determine the target access network according to the priority in the candidate target access network information, such as determining that the highest priority is the target access network.
  • the base station may further determine the target access network according to the DRB ID, for example, determining the bandwidth required by the DRB according to the quality of service (QoS) parameter of the DRB, and then determining, according to the required bandwidth, the network having the corresponding bandwidth.
  • Target access network may be determined by the DRB ID, for example, determining the bandwidth required by the DRB according to the quality of service (QoS) parameter of the DRB, and then determining, according to the required bandwidth, the network having the corresponding bandwidth.
  • QoS quality of service
  • the base station can also determine the target access network by combining various factors as described above. For example, the base station determines that the access network with the highest priority among the access networks that meet the preset signal quality is the target access network. After determining the target access network, the base station may send a handover command to the terminal to instruct the terminal to switch to the target access network.
  • the switch command includes at least the network name of the target access network, and optionally, the DRB information that is switched to the target access network.
  • the base station may also decide not to instruct the terminal to switch the network according to the information of the received candidate target access network.
  • the base station may not send any command, and may also send a non-switching command to the terminal.
  • the base station instructs the terminal to enable the ANDSF.
  • the base station can determine whether to allow the terminal to enable the ANDSF in multiple manners. The following two methods are introduced: Mode 1: The base station determines whether to allow the terminal to enable the ANDSF according to the local policy. . Specifically, the base station may determine, according to at least one of the following conditions, that the terminal is enabled to turn on the ANDSF: the load of the base station is greater than the first preset threshold or the moving speed of the terminal is lower than the second preset threshold. For example, when the base station detects that the currently connected LTE side network is overloaded and exceeds the first preset threshold, it needs to load part of the network load to other networks. At this time, the base station allows the terminal to enable the ANDSF.
  • the base station learns that the moving speed of the terminal is lower than the second preset threshold, and performs network switching, and the base station may allow the terminal to enable the ANDSF.
  • the base station may determine to indicate that the terminal maintains the OFF state of the ANDSF according to at least one of the following conditions:
  • the base station confirms that there is no switchable access network or the moving speed of the terminal is higher than the third preset threshold. For example, when the base station detects that there is no switchable access network, the terminal has no available access network to perform handover. At this time, the base station may instruct the terminal to maintain the closed state of the ANDSF.
  • the base station may instruct the terminal to maintain the closed state of the ANDSF.
  • Manner 2 The base station can determine whether to allow the terminal to be enabled according to the local policy and the ANDSF information.
  • the base station first acquires ANDSF information from the core network. Then, the base station combines the above local policy and ANDSF information to determine whether to allow the terminal to be enabled.
  • the base station detects the location (such as latitude and longitude) indicated by the access network discovery information in the ANDSF information, or the base station detects the access network name (such as the cell ID of the LTE) indicated in the access network discovery information in the ANDSF. And complying with the above-mentioned local policy, the base station allows the terminal to enable the ANDSF when the base station learns that the currently accessed LTE side network is overloaded and/or the terminal's moving speed is lower than the second preset threshold.
  • the base station may simultaneously set a scan period in the indication message, so that the terminal performs scanning according to the scan period, thereby saving power consumption of the terminal.
  • the base station may also set a condition for the access network to discover successfully in the indication message, so that the terminal determines the access network that meets the condition as the candidate target access network. In this way, the base station controls the terminal to select the target access network.
  • the base station may also send the self-defined idle state mobility policy to the terminal through the network discovery control message.
  • the idle state mobility policy refers to a policy of which access network is accessed when the terminal is in an idle state. For example, the definition of an LTE network has a higher priority than a WLAN network.
  • the terminal in the idle state when the terminal in the idle state determines that the network discovery function is not allowed to be enabled according to the network discovery control message, the terminal may access the corresponding access network according to the idle state mobility policy.
  • the idle state mobility policy When the terminal in the idle state judges that the network discovery function is enabled according to the network discovery control message, the idle state mobility policy is ignored, and the corresponding access network is detected according to information such as ANDSF.
  • the corresponding base station also performs handover. If the base station and the base station of the target access network are both base stations of the 3GPP network, the base station sends at least one of the indication message and the ANDSF information to the base station of the target access network during the handover.
  • the base station of the target access network can perform the next Radio Resource Management (RRM) policy according to this, and the method also helps to save the open cost.
  • the second embodiment of the present invention provides a base station.
  • the base station includes: an indication unit 11 configured to instruct the terminal to enable an access network discovery and selection function ANDSF, The terminal obtains access network information by using the ANDSF, where the access network information includes candidate target access network information, and the receiving unit 12 is configured to receive the candidate target access network information sent by the terminal; And determining, by using the candidate target access network information, a target access network, and switching the terminal to the target access network.
  • the terminal turns on the ANDSF according to the foregoing indication, performs network scanning to obtain access network information, and determines the qualified access network as the candidate target access network.
  • the candidate target access network information includes at least a network name of the candidate target access network.
  • the candidate target access network information may further include a signal quality corresponding to each candidate target access network and/or a priority of each candidate target access network and/or a bearer information determined by the terminal to switch to the candidate target access network.
  • bearer identification DRB ID
  • the switching unit may determine the target access network according to the signal quality in the candidate target access network information, such as selecting the target access network with the best signal quality.
  • the handover unit may also determine the target access network according to the priority in the candidate target access network information, such as determining that the highest priority is the target access network.
  • the switching unit may further determine the target access network according to the DRB ID, and determine the bandwidth required by the DRB according to the quality of service (QoS) parameter of the DRB, and then determine the network with the corresponding bandwidth according to the required bandwidth.
  • Target the network. For example, when the required bandwidth is large, the network with a lighter network load can be selected as the target access network.
  • the following is a specific implementation manner of determining the target access network according to the foregoing DRB ID:
  • the type of the service A to be transmitted by the terminal for example, the traffic flow template (TFT) of the service A is reported to the base station.
  • TFT traffic flow template
  • the eNB obtains the service flow template of the service A and the DRB mapping relationship from the core network MME in advance. For example, in the bearer setup/modification process of the A service, the MME sends the service flow template of the A service to the base station.
  • the base station determines the bandwidth required by the service A according to the quality of service QoS parameter identified by the service flow template reported by the terminal, and selects the access network with the corresponding bandwidth as the target access network.
  • the switching unit may also determine the target access network in combination with the foregoing various factors, such as determining that the access network with the highest priority among the access networks that meet the preset signal quality is the target access network.
  • a handover command may be sent to the terminal to instruct the terminal to switch to the target access network.
  • the switch command includes at least the network name of the target access network, and optionally, the DRB information that is switched to the target access network.
  • the indication unit instructs the terminal to enable the ANDSF.
  • the base station further includes a processing unit, configured to determine whether the terminal is allowed to enable the ANDSF.
  • the processing unit is configured to determine, according to the local policy, whether the terminal is allowed to enable the ANDSF.
  • the processing unit is configured to determine, according to at least one of the following conditions, that the terminal is enabled to enable the
  • ANDSF The load of the base station is greater than the first preset threshold or the moving speed of the terminal is lower than the second preset threshold. For example, when it is detected that the currently connected LTE side network is overloaded and exceeds the first preset threshold, part of the network load needs to be shared to other networks. At this time, the processing unit allows the terminal to enable the ANDSF.
  • the processing unit may allow the terminal to enable the ANDSF.
  • the processing unit is further configured to determine, according to at least one of the following conditions, that the terminal keeps the
  • the closed state of the ANDSF It is confirmed that there is no switchable access network or the moving speed of the terminal is higher than the third preset threshold. For example, when it is detected that there is no switchable access network, the terminal has no available access network to perform handover. At this time, the processing unit determines to instruct the terminal to maintain the OFF state of the ANDSF. If the terminal moves faster than the third preset threshold and is out of the coverage of the current network in a short time, the processing unit may decide to instruct the terminal to maintain the OFF state of the ANDSF.
  • the receiving unit is specifically configured to obtain ANDSF information from the core network, where the processing unit is configured to determine whether to allow the terminal to enable the ANDSF according to the local policy and the ANDSF information: If it detects the location (such as latitude and longitude) indicated by the access network discovery information in the ANDSF information, or detects the access network name (such as the cell ID of the LTE) indicated in the access network discovery information in the ANDSF, And complying with the foregoing local policy, for example, knowing that the currently accessed LTE side network is overloaded and/or the terminal moving speed is lower than the second preset threshold.
  • the processing unit is configured to determine whether to allow the terminal to enable the ANDSF according to the local policy and the ANDSF information: If it detects the location (such as latitude and longitude) indicated by the access network discovery information in the ANDSF information, or detects the access network name (such as the cell ID of the LTE) indicated in the access network discovery information in the ANDSF, And complying with the foregoing local policy, for example, knowing that the currently accessed
  • the foregoing base station may further include a sending unit, configured to send an indication message to the terminal to indicate whether the terminal turns on the ANDSF.
  • the sending unit may be specifically configured to broadcast a system message used to indicate whether the terminal turns on the ANDSF. For example, a Boolean type indication can be broadcast. When the terminal is allowed to open ANDSF, its value is set to "ture”. When the terminal is not allowed to open ANDSF, its value is set to "flase". Or the sending unit may be specifically configured to send an indication message to the terminal according to the request sent by the terminal received by the receiving unit, where the request is used by the terminal request indication unit to instruct the terminal to enable the ANDSF.
  • the terminal may send the foregoing request to the receiving unit by using a Radio Resource Control (RRC), and the corresponding sending unit may send an indication message that allows the terminal to enable the ANDSF by using an RRC message.
  • RRC Radio Resource Control
  • the sending unit may indicate a Boolean type indication in the RRC message, and set the value to "ture” when the terminal is allowed to enable the ANDSF, and set the value to "flase” when the terminal is not allowed to enable the ANDSF.
  • the indication unit may simultaneously set a scan period in the indication message, so that the terminal performs scanning according to the scan period, thereby saving power consumption of the terminal.
  • the indication unit may also set the condition that the access network discovery is successful in the indication message, so that the terminal determines the access network that meets the condition as the candidate target access network.
  • the base station controls the terminal to select the target access network.
  • the corresponding base station also performs handover.
  • the transmitting unit is further configured to send at least one of the indication message and the ANDSF information to the base station of the target access network. So that the base station of the target access network can perform the next step of radio resource management (Radio Resource
  • Embodiment 3 of the present invention further provides a handover method. Referring to FIG. 3, the method includes:
  • the terminal starts an access network discovery and selection function ANDSF according to the indication of the base station.
  • the terminal may enable the ANDSF according to the indication message sent by the base station.
  • the terminal can turn on the ANDSF according to the system message broadcasted by the received base station.
  • the terminal receives and reads the system message broadcast by the base station, and then determines whether the ANDSF is allowed to be enabled. If an indication of a Boolean type is received and its value is "ture”, it is judged that ANDS is allowed to be enabled. If the value indicated by the Boolean type is "false", it is judged that ANDSF is not allowed to be turned on.
  • the terminal may also send a request to the base station to request to enable the ANDSF, for example, when the terminal detects the access network that meets the preset condition.
  • the above request is sent to the base station.
  • the terminal may send the foregoing request to the base station by using an RRC message.
  • the base station returns an indication message according to the foregoing request, and the indication message can be sent by using an RRC message.
  • the terminal receives the RRC message and then determines whether to allow the ANDSF to be enabled. If an indication of a Boolean type is received, the value is "ture”, then it is judged that the ANDSF is enabled. If the value indicated by the Boolean type is "false", it is judged that the ANDSF is not allowed to be enabled.
  • the foregoing indication message may be generated by the base station according to the local policy, or may be generated by the base station in combination with the local policy and the ANDSF information acquired from the core network. For details, refer to the discussion of Embodiment 1.
  • the terminal acquires access network information by using the ANDSF, where the access network information includes candidate target access network information. If the terminal determines that the ANDSF is enabled, the network scan is started to obtain the access network information.
  • the terminal can obtain ANDSF information from the core network, and then perform network scanning based on the ANDSF information. Specifically, the terminal may obtain the ANDSF information by using the terminal request by the application layer, or obtain the ANDSF by using the network trigger.
  • the terminal may detect the corresponding network according to the inter-system mobility policy and the access network discovery information in the ANDSF information, for example, the terminal opens the network discovery in an appropriate location according to the network location and the network name of the access network discovery information in the ANDSF information.
  • Function network scanning; For example, the terminal can preferentially scan the network with higher priority according to the inter-system movement. It should be noted that, if the indication sent by the base station includes the period of the network scanning, the terminal may perform network scanning according to the period. Compared with the prior art, this method saves power consumption of the terminal.
  • the terminal sends the candidate target access network information to the base station.
  • the terminal determines the access network that meets certain conditions as the candidate target access network. For example, the terminal determines the access network that meets the ANDSF information as the candidate target access network.
  • the base station may simultaneously send a network discovery success condition such as a threshold of the access network signal command to the terminal, and the terminal may further combine the condition to access the network to meet the condition that the network is found to be successful.
  • the network is determined to be the target access network.
  • the candidate target access network information includes at least a network name of the candidate target access network.
  • the candidate target access network information may further include a signal quality corresponding to each candidate target access network and/or a priority of each candidate target access network and/or a bearer information determined by the terminal to switch to the candidate target access network.
  • a bearer information determined by the terminal to switch to the candidate target access network.
  • DRB ID bearer identification
  • the terminal can report the candidate target access network information to the base station by using an RRC message.
  • the terminal switches to a target access network that is determined by the base station according to the candidate target access network information.
  • the base station determines the target access network according to the candidate target access network information, and sends a handover command to the terminal, where the terminal can switch to the target access network.
  • network switching may not be performed by default.
  • the base station may further send cell reselection priority information to the terminal.
  • the terminal may ignore the cell reselection priority information delivered by the base station, or set the priority of the inter-system mobility policy of the ANDSF information to the highest.
  • the fourth embodiment of the present invention provides a terminal.
  • the terminal includes: an opening unit 21, configured to enable an access network discovery and selection function ANDSF according to an indication of the base station;
  • the obtaining unit 22 is configured to acquire access network information by using the ANDSF, where the access network information includes candidate target access network information, and the sending unit 23 is configured to send the candidate target access network information to the base station.
  • the switching unit 24 is configured to switch to the target access network determined by the base station according to the candidate target access network.
  • the acquiring unit may obtain access network information by performing network scanning.
  • the candidate target access network information includes at least a network name of the candidate target access network.
  • the candidate target access network information may further include a signal quality corresponding to each candidate target access network and/or a priority of each candidate target access network and/or a bearer information determined by the terminal to switch to the candidate target access network.
  • a bearer information determined by the terminal to switch to the candidate target access network.
  • DRB ID bearer identification
  • the sending unit may report the candidate target access network information to the base station by using an RRC message.
  • the base station determines the target access network according to the candidate target access network information, and sends a handover command to the receiving unit, where the switching unit can switch to the target access network. It should be noted that, in the present invention, when any command sent by the base station is not received, the switching unit may not perform network switching by default.
  • the terminal further includes a receiving unit, configured to receive an indication message sent by the base station, and the opening unit is configured to enable the ANDSF according to the indication message.
  • the opening unit may turn on the ANDSF according to the system message broadcasted by the received base station.
  • the receiving unit is configured to receive and read a system message broadcast by the base station, and then turn on the unit to determine whether to allow the ANDSF to be enabled. If an indication of a Boolean type is received and its value is "ture”, the opening unit judges that the ANDSF is enabled to open the ANDSF. If the value indicated by the Boolean type is "false", the opening unit determines that the ANDSF is not allowed to be turned on, and the ANDSF is not turned on.
  • the terminal further includes a sending unit, configured to send, to the base station, a request to open the ANDSF, for example, when detecting the access network that meets the preset condition, the sending unit sends the base station to the base station.
  • Send the above request Specifically, the sending unit may send the foregoing request to the base station by using an RRC message.
  • the base station returns an indication message according to the foregoing request, and the indication message may be sent by using an RRC message.
  • the receiving unit receives the RRC message, and then turns on the unit to determine whether to allow the ANDSF to be turned on. If an indication of a Boolean type is received and its value is "ture", it is judged that the ANDSF is enabled.
  • the receiving unit is further configured to receive ANDSF information from the core network, and then the acquiring unit performs network scanning according to the ANDSF information to obtain access network information.
  • the acquiring unit may detect the corresponding network according to the inter-system mobility policy and the access network discovery information in the ANDSF information, for example, the acquiring unit opens in an appropriate location according to the network location and the network name of the access network discovery information in the ANDSF information.
  • the network discovery function performs network scanning; for example, the obtaining unit can preferentially scan the network with higher priority according to the inter-system movement to the policy.
  • the terminal of the present invention may further comprise a determining unit, configured to determine an access network that meets certain conditions as a candidate target access network, such as determining an access network that conforms to the ANDSF information as a candidate target access network.
  • the base station may simultaneously send a network discovery success condition, such as a threshold of the access network signal command, to the terminal, and the determining unit may further combine the condition to meet the condition that the network discovery succeeds.
  • the access network is determined to be the target access network.
  • the sending unit may report the candidate target access network information to the base station by using an RRC message.
  • the embodiment of the present invention further provides a hardware configuration of the base station.
  • At least one processor e.g., a CPU
  • at least one network interface or other communication interface may be included for enabling connection communication between the devices.
  • the processor is configured to execute an executable module, such as a computer program, stored in the memory.
  • the memory may contain high speed random access memory (RAM: Random Access Memory ) may also include non-volatile memory, such as at least one disk storage.
  • the communication connection between the system gateway and at least one other network element may be implemented through at least one network interface (which may be wired or wireless), and may use an Internet, a wide area network, a local network, a metropolitan area network, or the like.
  • program instructions are stored in a memory, and the program instructions may be executed by a processor, where the program instructions may include an indication unit 31, a receiving unit 32, a switching unit 33, or the program instructions may further include sending Unit 34, processing unit 35.
  • the processor is configured to perform the following steps according to the foregoing procedure: instructing the terminal to enable an access network discovery and selection function ANDSF, where the terminal is used by the terminal
  • the ANDSF acquires access network information, where the access network information includes candidate target access network information, receives the candidate target access network information sent by the terminal, and determines target access according to the candidate target access network information. Networking and switching the terminal to the target access network.
  • the processor may also perform other steps of the base station side method embodiment described above in accordance with the above program instructions.
  • the embodiment of the invention further provides a hardware configuration of the terminal. At least one processor (e.g., a CPU), at least one network interface or other communication interface, memory, and at least one communication bus may be included for implementing connection communication between the devices.
  • the processor is for executing executable modules stored in the memory, such as a computer program.
  • the memory may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory such as at least one disk memory.
  • RAM Random Access Memory
  • the communication connection between the system gateway and at least one other network element may be implemented through at least one network interface (which may be wired or wireless), and the Internet, a wide area network, a local network, a metropolitan area network, etc. may be used.
  • program instructions are stored in a memory, and the program instructions may be executed by a processor, where the program instructions may include an opening unit 41, an obtaining unit 42, a transmitting unit 43, a switching unit 44, or a program instruction.
  • a receiving unit 45 may also be included.
  • the processor is used to refer to the above procedure The following steps are performed: the access network discovery and selection function ANDSF is started according to the indication of the base station; the access network information is acquired by the ANDSF, the access network information includes candidate target access network information; and the candidate target access is sent. Network information to the base station; handover to a target access network determined by the base station according to the candidate target access network information.
  • the processor can also perform other steps of the above-described terminal side method embodiment in accordance with the above program instructions.
  • the present invention also provides a handover system, see Fig. 7, comprising at least one base station 51 and at least one of the above terminals 52.
  • the base station is configured to instruct the terminal to enable the ANDSF, receive the candidate target access network information sent by the terminal, and determine the target access network according to the candidate target access network information, and instruct the terminal to switch to the target access network.
  • the terminal is configured to enable the ANDSF according to the indication of the base station, perform network scanning, obtain access network information, determine candidate target access network information, and send the candidate target access network information to the base station, and switch to the target access network sent by the base station.
  • the terminal may perform network scanning according to the ANDSF information acquired from the core network to obtain access network information and determine a candidate target access network.
  • the base station is further configured to send an indication message to the terminal, where the terminal is further configured to receive the indication message, and start an ANDSF according to the message, and perform network scanning to obtain access network information.
  • the base station may be configured to deliver the indication message by using a broadcast system message.
  • the terminal may send a request to open the ANDSF to the base station, and the base station is configured to send the indication message according to the request, and the specific terminal may send the request by using an RRC message, and the base station may send the indication message by using the RRC message.
  • the foregoing indication message may be generated by the base station according to the local policy, or may be generated by the base station in combination with the local policy and the ANDSF information acquired from the core network.
  • the base station of the target access network and the base station are both base stations of the 3GPP network
  • the base station is further configured to send at least one of the indication message and the ANDSF information to the base station of the target access network during the handover process. Therefore, the base station of the target access network can perform the next Radio Resource Management (RRM) strategy according to this, and the method is also beneficial to save the floating expenses.
  • RRM Radio Resource Management
  • the specific process is as follows:
  • the terminal sends a request message for the ANDSF information to the core network.
  • the core network After receiving the request, the core network sends the ANDSF information to the terminal.
  • the ANDSF information defines that the LTE network has a higher priority than the WLAN network, and the access network discovery information includes the names of the access networks LTE2, WLAN 1 and WLAN 2, WLAN 3, and the locations of the four access networks.
  • the terminal then sends a start network discovery function request message to the base station. It is common for the terminal to discover the network discovery condition according to the ANDSF information, and then send a network discovery request message to the base station.
  • the network discovery condition is found to be the access network location indicated by the access network discovery information in the ANDSF information (such as latitude and longitude), or enter the network name of the access network indicated by the access network discovery information in the ANDSF information (eg, Cell ID of LTE).
  • the terminal may send a network discovery request message to the base station based on the RRC message.
  • the base station detects that the current LTE1 network is overloaded, and the WLAN network is available in the coverage area. Then, a Boolean type indication is set, and the value is set to ture, and the indication is sent to the RRC message to the RRC message. terminal.
  • the base station simultaneously delivers a network scanning period of one hour, and the condition that the network discovery succeeds is that the network signal quality is not lower than 1 ⁇ .
  • the terminal acquires the RRC message, and determines that the base station allows the network to be enabled by the value indicated by the Boolean type. Discovery features. Therefore, the terminal opens the network discovery function at the appropriate location according to the network location and the network name in the access network discovery information in the ANDSF information every hour, performs network scanning, and preferentially scans the high priority according to the inter-system mobility policy.
  • Network and LTE network may be any time.
  • the terminal detects three networks of LTE2, WLAN1 and WLAN2 through scanning, and finds that the signal quality T1 and ⁇ 2 of LTE2 and WLAN1 are higher than ⁇ , and ⁇ 2 is larger than Tl, and the signal quality ⁇ 3 of WLAN2 is lower than ⁇ 3. Then, LTE2 and WLAN1 are determined as candidate access networks according to the network discovery success condition.
  • the terminal reports the information of the candidate access network to the base station in the order of LTE2 and WLAN1 according to the priority order defined in the ANDSF information.
  • the reported information includes the name of the candidate access network (LTE2, WLAN1), the location, the network signal quality (T1, ⁇ 2), and the data bearer identifier DRB ID1 that the terminal decides to switch to the target access network.
  • the base station determines that the bandwidth required by the DRB is large according to the QoS parameter of the DRB ID1, and only
  • the base station determines the WLAN1 as the target access network, and delivers the handover indication to the terminal.
  • the terminal obtains the indication, and then routes the bearer service corresponding to the DRB ID1 to the WLAN1 network.
  • the above is that the terminal is switched from LTE to the WLAN network. In actual applications, the terminal can also switch from the WLAN to the LTE network as needed.
  • the specific process is used and will not be described in detail here. While the preferred embodiment of the present invention has been described, it will be apparent that those skilled in the art can make various changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

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Abstract

本发明公开了一种切换方法、基站及终端。其中，方法包括：基站指示终端开启接入网发现和选择功能ANDSF（S11），用于所述终端通过所述ANDSF获取接入网信息，所述接入网信息包括候选目标接入网信息；所述基站接收所述终端发送的所述候选目标接入网信息（S12）；和所述基站根据所述候选目标接入网信息确定目标接入网，并将所述终端切换至所述目标接入网（S13）。根据该技术方案，实现了基站对终端的控制，提高了终端的可控性。

Description

一种切换方法、 基站及终端 技术领域 本发明涉及接入网技术领域， 尤其涉及一种切换方法、 基站及终端。 背景技术 随着移动互联网的发展，对蜂窝通信***能够提供的服务质量与网络速度 的要求越来越高。 但***式增长的数据流量造成了严重的网络堵塞， 为此， 目 前采用多种接入网的方式对蜂窝数据进行分流。比如 LTE( Long Term Evolution 长期演进 )与 WLAN ( Wireless Local Area Networks, 无线局域网）。 为合理利用网络侧资源，保证用户的业务体验，选择一个合适的接入网显 得尤为重要， 但现有技术中， 并没有一个有效的接入网的选择机制。
发明内容
有鉴于此， 本发明实施例提供一种切换方法、 基站及终端， 实现终端在 网络间的切换。 本发明采取的技术方案是：
第一方面， 本发明提供了一种切换方法， 所述方法包括：
基站指示终端开启接入网发现和选择功能 ANDSF, 用于所述终端通过所 述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接入网信息；
所述基站接收所述终端发送的所述候选目标接入网信息； 和 所述基站根据所述候选目标接入网信息确定目标接入网，并将所述终端切 换至所述目标接入网。 在第一方面的第一种可能的实现方式中，所述基站指示终端开启 ANDSF, 具体包括： 所述基站向所述终端发送指示消息，所述指示消息用于指示所述终端是否 开启所述 ANDSF; 所述基站通过所述指示消息指示所述终端开启所述 ANDSF。 结合第一方面或者第一方面的第一种可能的实现方式，在第一方面的第二 种可能的实现方式中， 还包括： 所述基站根据以下至少一种情况确定指示所述终端开启所述 ANDSF: 所述基站的负载量大于第一预设门限或所述终端的移动速度低于第二预 设门限； 所述基站根据以下至少一种情况确定指示所述终端保持所述 ANDSF的关 闭状态： 所述基站确认不存在可切换的接入网或所述终端的移动速度高于第三预 设门限。 结合第一方面的第二种可能的实现方式，在第三种可能的实现方式中，还 包括： 所述基站接收核心网发送的 ANDSF信息； 所述基站根据所述 ANDSF信息进一步确认是否指示所述终端开启所述 ANDSF。 结合第一方面或者第一方面的第一种可能的实现方式，在第一方面的第四 种可能的实现方式中， 还包括： 所述基站接收所述终端发送的请求，所述请求用于请求所述基站指示所述 终端开启所述 ANDSF。 结合第一方面或者第一方面的第一至第四种可能的实现方式，在第五种可 能的实现方式中， 当所述基站和所述目标接入网均为 3GPP网络的基站时， 在 切换过程中， 所述基站还将以下至少一种发送至所述目标接入网： 所述指示消息； 所述 ANDSF信息。 第二方面， 本发明提供了一种基站， 包括： 指示单元， 用于指示终端开启接入网发现和选择功能 ANDSF, 用于所述 终端通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接入网 信息； 接收单元， 用于接收所述终端发送的所述候选目标接入网信息； 和 切换单元， 用于根据所述候选目标接入网信息确定目标接入网， 并将所述 终端切换至所述目标接入网。 在第二方面的第一种可能的实现方式中， 还包括： 发送单元， 用于向所述终端发送指示消息， 所述指示消息用于指示所述终 端是否开启所述 ANDSF。 结合第二方面或者第二方面的第一种可能的实现方式，在第二方面的第二 种可能的实现方式中， 还包括： 处理单元， 用于根据以下至少一种情况确定指示所述终端开启所述 ANDSF: 基站的负载量大于第一预设门限或所述终端的移动速度低于第二预设门 限； 或 用于根据以下至少一种情况确定指示所述终端保持所述 ANDSF的关闭状 态： 确认不存在可切换的接入网或所述终端的移动速度高于第三预设门限。 结合第二方面的第二种可能的实现方式，在第二方面的第三种可能的实现 方式中， 所述接收单元， 还用于接收核心网发送的 ANDSF信息； 所述处理单元，还用于根据 ANDSF信息进一步确认是否指示所述终端开 启所述 ANDSF。 结合第二方面或者第二方面的第一种可能的实现方式，在第二方面的第四 种可能的实现方式中， 所述接收单元，还用于接收所述终端发送的请求， 所述请求用于请求所述 指示单元指示所述终端开启所述 ANDSF。 结合第二方面或者第二方面的第一至第四种可能的实现方式，在第二方面 的第五种可能的实现方式中， 当所述基站和所述目标接入网均为处于 3GPP网络时， 在切换过程中， 所 述发送单元， 还用于将以下至少一种发送至所述目标接入网： 所述指示消息； 所述 ANDSF信息。 第三方面， 本发明提供了一种切换方法， 包括： 终端根据基站的指示开启接入网发现和选择功能 ANDSF; 终端通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接 入网信息； 所述终端发送所述候选目标接入网信息至所述基站； 所述终端切换至所述基站根据所述候选目标接入网信息所确定的目标接 入网。 在第三方面的第一种可能的实现方式中，终端根据基站的指示开启接入网 发现和选择功能 ANDSF, 具体包括： 所述终端接收所述基站发送的指示消息，所述指示消息用于指示所述终端 是否开启 ANDSF; 所述终端根据所述指示消息开启所述 ANDSF。 结合第三方面或者第三方面的第一种可能的实现方式，在第三方面的第二 种可能的实现方式中， 还包括： 所述终端发送请求至所述基站， 其中， 所述请求用于请求所述基站指示所 述终端开启所述 ANDSF。 结合第三方面或者第二方面的第一至第二种可能的实现方式，在第三方面 的第三种可能的实现方式中，当所述基站的负载量大于第一预设门限或所述终 端的移动速度低于第二预设门限时，所述指示消息用于指示所述终端开启所述 ANDSF; 当所述基站确认不存在可切换的所述目标接入网或所述终端的移送速度 高于第三预设门限时， 所述指示消息用于指示所述终端保持所述 ANDSF的关 闭状态。 结合第三方面的第三种可能的实现方式，在第三方面的第四种可能的实现 方式中， 所述指示消息为所述基站根据核心网发送的 ANDSF信息生成。 第四方面， 本发明提供一种终端， 包括： 开启单元， 用于根据基站的指示开启接入网发现和选择功能 ANDSF; 获取单元， 用于通过所述 ANDSF获取接入网信息， 所述接入网信息包括 候选目标接入网信息； 发送单元， 用于发送所述候选目标接入网信息至所述基站； 切换单元，用于切换至所述基站根据所述候选目标接入网确定的目标接入 网。 在第四方面的第一种可能的实现方式中， 还包括： 接收单元， 用于接收所述基站发送的指示消息， 所述指示消息用于指示所 述终端是否开启 ANDSF。 结合第四方面或者第四方面的第一种可能的实现方式，在第四方面的第二 种可能的实现方式中， 所述发送单元， 还用于发送请求至所述基站， 其中， 所 述请求用于请求所述基站指示所述终端开启所述 ANDSF。 结合第四方面或者第四方面的第一至第二种可能的实现方式，在第四方面 的第三种可能的实现方式中，当所述基站的负载量大于第一预设门限或所述终 端的移动速度低于第二预设门限时，所述指示消息用于指示所述终端开启所述 ANDSF; 当所述基站确认不存在可切换的接入网或所述终端的移送速度高于第三 预设门限时， 所述指示消息用于指示所述终端保持所述 ANDSF的关闭状态。 结合第四方面的第三种可能的实现方式，在第四方面的第四种可能的实现 方式中， 所述指示消息为所述基站根据核心网发送的 ANDSF信息生成。 通过本发明实施例提供的上述至少一个技术方案，使得终端只有在基站允 许其开启网络发现功能时才对相应的网络进行扫描，相对现有技术中， 实现了 基站对终端的控制， 提高了终端的可控性。 本发明的其它特征和优点将在随后的说明书中阐述， 并且，部分地从说明 书中变得显而易见， 或者通过实施本发明而了解。本发明的目的和其他优点可 通过在所写的说明书、权利要求书、 以及附图中所特别指出的结构来实现和获 付。 附图说明 图 1为本发明实施例一基站侧方法流程图； 图 2为本发明实施例二基站结构图； 图 3为本发明实施例三终端侧方法流程图； 图 4为本发明实施例四终端结构图； 图 5为本发明实施例基站的硬件结构示意图； 图 6为本发明实施例终端的硬件结构示意图。 具体实施方式 为使本发明更加清楚，下面将结合说明书附图对本发明的优选实施例进行 说明， 应当理解， 此处所描述的优选实施例仅用于说明和解释本发明， 并不用 于限定本发明。 并且在不沖突的情况下， 本申请中的实施例及实施例中的特征 可以相互组合。 本发明的核心思想在于， 通过基站指示终端开启接入网发现和选择功能
(Access Network Discovery and Selection Function, ANDSF),使终端在基站的控 制下对相应的接入网进行扫描， 并通过基站确定终端要切换的目标接入网。相 对现有技术， 本发明实现了基站对终端的控制， 提高了终端的可控性。
ANDSF是核心网引入的概念， 包括数据管理和控制功能。 在本发明实施 例中， 当终端开启 ANDSF时， 会根据从核心网获取的 ANDSF信息对网络进行 扫描获取可用的接入网信息。 ANDSF信息包括：
1 ) ***间移动性策略 ***间移动性策略是一组运营商定义的规则和偏好，它能影响***间的移 动性决策。 具体地， ***间移动性策略可包括以下至少一种： a ) ***间的优先级， 如 LTE的优先级高于 WLAN。 b ) ***内不同网络的优先级， 如 WLAN SSID-1优先于 WLAN SSID-2。 c ) ***间的移动性是否允许， 如是否允许从 LTE到 WLAN的切换， 或者在一 定条件下允许从 LTE到 WLAN的切换。 d )有效的条件， 也就是指示该***间移动性策略有效的条件， 例如有效的时 间和地点。
2)接入网发现信息 当 UE请求网络选择时， ANDSF信息能够提供一组 UE周边有效的接入网络 列表， 该列表包括各种接入网络技术。有效的接入技术信息包括接入技术类型 (如 WLAN、 WiMAX)和无线接入网络。 标识符 (如 WLAN的 SSID)。 另夕卜， 还有 其他技术的具体信息， 如一个或多个载频； 约束条件， 如一些条件标识何时提 供的接入网络信息有效。 UE应保留和使用这些 ANDSF提供的接入网络信息直 到收到下一次更新信息。
3 ) ***间路由策略
ANDSF可能提供***间路由信息， 即不同业务可在不同的***接入。 UE 可根据该策略， 将不同的业务选择不同的***接入。 如一个或多个过滤规则， 即每个标识一种业务或者 APN连接的优先***的规则。 现有的 ANDSF信息主要是运营商根据用户的签约信息和历史统计信息在 核心网定义的， 该信息中并没有精确考虑接入网信息， 并不能保证接入网信息 的真实可靠， 所以用户设备在使用 ANDSF时， 需要提前进行扫描， 以获得可 用接入网的信息。 需要说明的是， 本发明中涉及的终端是指可与多个接入网连 接的终端， 例如智能手机、 智能电子阅读设备等。 其中， 接入网可以是 3G网 络， 如 LTE网络， 也可以是非 3G网络， 如无线局域网 WLAN等。 参见图 1 , 为本发明实施例一提供的一种切换方法， 该方法具体包括：
Sll、 基站指示终端开启接入网发现和选择功能 ANDSF。 本发明中， 终端只有在接收到基站的开启接入网发现和选择功能的指示 时， 才会进行网络扫描以获取接入网信息。 该终端通过所述 ANDSF获取接入 网信息， 所述接入网信息包括候选目标接入网信息。 其中， 扫描获得的接入网 信息中包括可用于后续进行切换的接入网信息即候选目标接入网信息。 本发明中基站通过发送用于指示终端是否开启 ANDSF的指示消息来指示 终端开启 ANDSF。本发明中，基站可通过如下两种方式发送指示消息至终端： 方式一： 基站广播用以指示终端是否开启 ANDSF的***消息。 如基站可 广播一位布尔（Boolean )类型的指示， 在允许终端开启 ANDSF时， 将其值设 为 "ture" , 在不允许终端开启 ANDSF时， 将其值设为 "flase"。 方式二：基站接收终端发送的用于请求基站指示终端开启 ANDSF的请求。 基站根据上述请求发送指示消息至终端。 其中， 终端可通过无线资源控制协议（Radio Resource Control , RRC ) 发送上述请求， 对应的基站可通过 RRC消息发送允许终端开启 ANDSF的指 示。 具体的， 基站可在 RRC消息中指示一位 Boolean类型的指示， 在允许终 端开启 ANDSF时， 将其值设为 "ture" , 在不允许终端开启 ANDSF时， 将其 值设为 "flase，，。
512、 所述基站接收所述终端发送的所述候选目标接入网信息。 终端根据基站的指示开启 ANDSF, 进行网络扫描获取接入网信息， 并将 符合条件的接入网确定为候选目标接入网。 上述候选目标接入网信息至少包括候选目标接入网的网络名称。 可选的，候选目标接入网信息还可包含各候选目标接入网对应的信号质量 和 /或各候选目标接入网的优先级和 /或终端决定切换到候选目标接入网的承载 信息如承载标识（ DRB ID )。
513、 所述基站根据所述候选目标接入网信息确定目标接入网， 并将所述 终端切换至所述目标接入网。 基站可根据候选目标接入网信息中的信号质量确定目标接入网，如选择信 号质量最好的为目标接入网。 基站也可根据候选目标接入网信息中的优先级确定目标接入网，如确定优 先级最高的为目标接入网。 基站还可以根据上述 DRB ID确定目标接入网， 如根据该 DRB的服务质 量（Quality of Service, QoS ) 参数判断该 DRB需要的带宽大小， 然后根据所 需的带宽大小确定具有相应带宽的网络为目标接入网。 如当所需的带宽较大 时， 可选择网络负荷较轻的网络为目标接入网。 当然基站还可以结合上述多种因素确定目标接入网，如基站确定满足预设 的信号质量的接入网中优先级最高的接入网为目标接入网。 基站确定目标接入网后， 可发送切换命令至终端， 以指示终端切换到目标 接入网。 切换命令中至少包含目标接入网的网络名称， 可选的， 还可包含切换 到该目标接入网的 DRB信息。 当然，在本发明中基站也可根据接收的候选目标接入网的信息， 决定不指 示终端切换网络。 在决定不指示终端切换接入网时， 基站可不发送任何命令， 也可发送不切换命令至终端。 上述实施例一中， 基站指示终端开启 ANDSF, 本发明中基站可通过多种 方式决定是否允许终端开启 ANDSF, 以下将对其中两种进行介绍： 方式一： 基站根据本地策略决定是否允许终端开启 ANDSF。 具体的， 基站可根据以下至少一种情况确定指示终端开启 ANDSF: 基站的负载量大于第一预设门限或终端的移动速度低于第二预设门限。 如， 当基站检测到当前接入的 LTE侧网络负载过重， 超过了第一预设门 限， 需要将部分网络负载分担到其他网络， 此时基站允许终端开启 ANDSF。
又如， 基站获知终端的移动速度低于第二预设门限， 可进行网络切换， 此 时基站可允许终端开启 ANDSF。 基站可根据以下至少一种情况确定指示终端保持 ANDSF的关闭状态： 基站确认不存在可切换的接入网或终端的移动速度高于第三预设门限。 如当基站检测到当前不存在可切换的接入网时，终端无可用的接入网进行 切换， 此时， 基站可指示终端保持 ANDSF的关闭状态。 又如基站检测到终端移动速度过快， 高于第三预设门限，会在短时间内脱 离当前网络的覆盖范围， 那么基站可指示终端保持 ANDSF的关闭状态。 方式二： 基站可结合本地策略和 ANDSF信息确定是否允许终端开启
ANDSF。 基站首先从核心网获取 ANDSF信息。 然后基站结合上述本地策略和 ANDSF信息决定是否允许终端开启
ANDSF。 如基站检测到进入了 ANDSF信息中的接入网络发现信息指示的位置（如 经纬度）， 或者基站检测到进入 ANDSF中接入网发现信息中所指示的接入网 络网络名称（如 LTE的小区 ID ) , 并符合上述本地策略， 如基站获知当前接入 的 LTE侧网络负载过重和 /或终端的移动速度低于第二预设门限值时， 基站允 许终端开启 ANDSF。 在本发明可选实施例中，基站可在指示消息中同时设置扫描周期， 以便终 端根据该扫描周期进行扫描， 节省终端用电。 在本发明另一可选实施例中，基站还可在指示消息中同时设置接入网发现 成功的条件， 以便终端将符合该条件的接入网确定为候选目标接入网。通过该 方式， 进一步提高了基站对终端选择目标接入网的控制。 需要说明的是，在优选实施例中，基站还可将自己定义的空闲态移动性策 略通过网络发现控制消息下发至终端。空闲态移动性策略是指当终端处于空闲 状态时接入何种接入网的策略。 比如定义 LTE网络的优先级高于 WLAN网络。 本 发明中，当处于空闲状态的终端根据网络发现控制消息判断到不允许开启网络 发现功能时可依据空闲态移动性策略接入相应的接入网。当处于空闲状态的终 端根据网络发现控制消息判断到允许开启网络发现功能时会忽略空闲态移动 性策略， 依据 ANDSF等信息检测相应的接入网。 当终端进行网络切换时，对应的基站也进行切换。如果上述基站与目标接 入网的基站均为 3GPP网络的基站时，在切换过程中，基站还将上述指示消息、 ANDSF信息中的至少一种发送至目标接入网的基站。 以便目标接入网的基站 能够据此做下一步无线资源管理（ Radio Resource Management,RRM ) 策略， 而且该方式也有利于节省空开开支。 对应上述方法，本发明实施例二提供了一种基站， 参见图 2 , 该基站包括： 指示单元 11 , 用于指示终端开启接入网发现和选择功能 ANDSF, 用于所 述终端通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接入 网信息； 接收单元 12, 用于接收所述终端发送的所述候选目标接入网信息； 切换单元 13, 用于根据所述候选目标接入网信息确定目标接入网， 并将 所述终端切换至所述目标接入网。 终端根据上述指示开启 ANDSF, 进行网络扫描获取接入网信息， 并将符 合条件的接入网确定为候选目标接入网。 上述候选目标接入网信息至少包括候选目标接入网的网络名称。 可选的，候选目标接入网信息还可包含各候选目标接入网对应的信号质量 和 /或各候选目标接入网的优先级和 /或终端决定切换到候选目标接入网的承载 信息如承载标识（ DRB ID )。 切换单元可根据候选目标接入网信息中的信号质量确定目标接入网，如选 择信号质量最好的为目标接入网。 切换单元也可根据候选目标接入网信息中的优先级确定目标接入网，如确 定优先级最高的为目标接入网。 切换单元还可以根据上述 DRB ID确定目标接入网， 如根据该 DRB的服 务质量（Quality of Service, QoS) 参数判断该 DRB需要的带宽大小， 然后根 据所需的带宽大小确定具有相应带宽的网络为目标接入网。如当所需的带宽较 大时， 可选择网络负荷较轻的网络为目标接入网。 下面为根据上述 DRB ID确定目标接入网一种具体实现方式： 终端将要传输的业务 A的类型如业务 A的业务流模板 (TFT, Traffic Flow Template)上报给基站。 基站从核心网 MME提前获取业务 A的业务流模板与 DRB映射关系， 如在 A业务相应的承载建立 /修改流程中， MME将 A业务的 业务流模板下发给基站。基站根据终端上报的业务流模板标识的服务质量 QoS 参数判断该业务 A需要的带宽， 以选择具有相应带宽的接入网为目标接入网。 当然切换单元还可以结合上述多种因素确定目标接入网，如确定满足预设 的信号质量的接入网中优先级最高的接入网为目标接入网。 切换单元确定目标接入网后， 可发送切换命令至终端， 以指示终端切换到 目标接入网。 切换命令中至少包含目标接入网的网络名称， 可选的， 还可包含 切换到该目标接入网的 DRB信息。 上述实施例中， 指示单元指示终端开启 ANDSF, 对应的， 基站还包括处 理单元， 用于决定是否允许终端开启 ANDSF。 在本发明可选实施例中，处理单元用于根据本地策略决定是否允许终端开 启 ANDSF: 具体的，处理单元用于根据以下至少一种情况确定指示所述终端开启所述
ANDSF: 基站的负载量大于第一预设门限或所述终端的移动速度低于第二预设门 限。 如， 当检测到当前接入的 LTE侧网络负载过重， 超过了第一预设门限， 需要将部分网络负载分担到其他网络， 此时处理单元允许终端开启 ANDSF。
又如， 检测到终端的移动速度低于第二预设门限， 可进行网络切换， 此时 处理单元可允许终端开启 ANDSF。 处理单元还用于根据以下至少一种情况确定指示所述终端保持所述
ANDSF的关闭状态： 确认不存在可切换的接入网或所述终端的移动速度高于第三预设门限。如 当检测到当前不存在可切换的接入网时，终端无可用的接入网进行切换，此时， 处理单元决定指示终端保持 ANDSF的关闭状态。 又如检测到终端移动速度过快， 高于第三预设门限，会在短时间内脱离当 前网络的覆盖范围， 那么处理单元可决定指示终端保持 ANDSF的关闭状态。 在本发明可选实施例中，接收单元，具体用于从核心网获取 ANDSF信息， 处理单元用于结合本地策略和 ANDSF信息决定是否允许终端开启 ANDSF: 如检测到进入了 ANDSF信息中的接入网络发现信息指示的位置（如经纬 度）， 或者检测到进入 ANDSF中接入网发现信息中所指示的接入网络网络名 称（如 LTE的小区 ID ), 并符合上述本地策略， 如获知当前接入的 LTE侧网 络负载过重和 /或终端的移动速度低于第二预设门限值。 在可选实施例中，上述基站还可包括发送单元，用于向终端发送指示消息， 以指示终端是否开启 ANDSF。 该发送单元，可具体用于广播用以指示终端是否开启 ANDSF的***消息。 如可广播一位布尔（Boolean )类型的指示， 在允许终端开启 ANDSF时， 将其 值设为 "ture" , 在不允许终端开启 ANDSF时， 将其值设为 "flase"。 或者上述发送单元可具体用于根据接收单元接收的终端发送的请求发送 指示消息至终端， 上述请求用于终端请求指示单元指示终端开启 ANDSF。 终端可通过无线资源控制协议（ Radio Resource Control , RRC )发送上 述请求至接收单元， 对应的发送单元可通过 RRC消息发送允许终端开启 ANDSF的指示消息。 具体的， 发送单元可在 RRC消息中指示一位 Boolean类 型的指示， 在允许终端开启 ANDSF时， 将其值设为 "ture" , 在不允许终端开 启 ANDSF时， 将其值设为 "flase"。 在本发明可选实施例中，指示单元可在指示消息中同时设置扫描周期， 以 便终端根据该扫描周期进行扫描， 节省终端用电。 在本发明另一可选实施例中，指示单元还可在指示消息中同时设置接入网 发现成功的条件， 以便终端将符合该条件的接入网确定为候选目标接入网。通 过该方式， 进一步提高了基站对终端选择目标接入网的控制。 当终端进行网络切换时，对应的基站也进行切换。如果上述基站与目标接 入网的基站均为 3GPP网络的基站时， 在切换过程中， 上述发送单元， 还用于 将指示消息、 ANDSF信息中的至少一种发送至目标接入网的基站， 以便目标 接入网的基站能够据此做下一步无线资源管理（ Radio Resource
Management,RRM )策略， 而且该方式也有利于节省空开开支。 本发明实施例三还提供了一种切换方法， 参见图 3, 该方法包括：
521、 终端根据基站的指示开启接入网发现和选择功能 ANDSF。 本发明中， 终端可根据基站发送的指示消息开启 ANDSF。 如终端可根据接收的基站广播的***消息开启 ANDSF。 具体的， 终端接 收并读取基站广播的***消息， 然后判断是否允许开启 ANDSF。 如果接收到 一位 Boolean类型的指示，其值为 "ture" ,则判断允许开启 ANDSF,若该 Boolean 类型指示的值为 "false" , 则判断不允许开启 ANDSF。 终端也可向基站发送请求开启 ANDSF的请求， 如终端在检测到符合预设 条件的接入网时。 向基站发送上述请求。 具体的， 终端可通过 RRC消息发送 上述请求至基站。 基站根据上述请求返回指示消息， 该指示消息可通过 RRC 消息发送。 终端接收到该 RRC消息， 然后判断是否允许开启 ANDSF。 如果接 收到一位 Boolean类型的指示， 其值为 "ture" , 则判断允许开启 ANDSF, 若 该 Boolean类型指示的值为 "false" , 则判断不允许开启 ANDSF。 其中， 上述指示消息可以是基站根据本地策略生成的，也可以是基站结合 本地策略和从核心网获取的 ANDSF信息生成的。具体可参见实施例一的论述。
522、 终端通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选 目标接入网信息。 若终端判断到开启 ANDSF, 则开始网络扫描， 获取接入网信息。 本发明中， 终端可从核心网获取 ANDSF信息， 然后根据 ANDSF信息进 行网络扫描。 具体的， 终端可通过应用层使用终端请求的方式获取 ANDSF信 息， 也可以通过网络触发来获取 ANDSF。
终端可根据 ANDSF信息中的***间移动性策略和接入网络发现信息来检 测相应的网络， 如终端根据 ANDSF信息中的接入网络发现信息的网络位置和 网络名称， 在合适的位置打开网络发现功能， 进行网络扫描； 又如终端可根据 ***间移动向策略优先扫描优先级高的网络。 需要说明的是，如果基站下发的指示中同时包含网络扫描的周期， 则终端 可按照该周期进行网络扫描。 相对现有技术， 该方式节省了终端用电。
523、 所述终端发送所述候选目标接入网信息至所述基站。 终端将符合一定条件的接入网确定为候选目标接入网， 如终端将符合 ANDSF信息的接入网确定为候选目标接入网。 在本发明的可选实施例中，基站可同时下发网络发现成功的条件如接入网 信号指令的门限至终端， 终端可进一步的结合该条件，将符合该网络发现成功 的条件的接入网确定为目标接入网。 上述候选目标接入网信息至少包括候选目标接入网的网络名称。 可选的，候选目标接入网信息还可包含各候选目标接入网对应的信号质量 和 /或各候选目标接入网的优先级和 /或终端决定切换到候选目标接入网的承载 信息如承载标识（ DRB ID )。 本发明中， 终端可通过 RRC消息将候选目标接入网信息上报至基站。
524、 所述终端切换至所述基站根据所述候选目标接入网信息所确定的目 标接入网。 基站根据候选目标接入网信息确定目标接入网， 并下发切换命令至终端， 终端可据此切换至目标接入网。 需要说明的是， 在本发明中， 当终端未接收到基站发送的任何命令时， 可 默认不进行网络切换。 本发明中，基站还可以向终端发送小区重选优先级信息。 当终端处于空闲 状态 （IDLE ) 时， 终端可以忽略基站下发的小区重选优先级信息， 或者将 ANDSF信息的***间移动性策略的优先级设置为最高。 针对上述方法，本发明实施例四提供了一种终端， 参见图 4,该终端包括： 开启单元 21 , 用于根据基站的指示开启接入网发现和选择功能 ANDSF; 获取单元 22,用于通过所述 ANDSF获取接入网信息，所述接入网信息包 括候选目标接入网信息； 发送单元 23, 用于发送所述候选目标接入网信息至所述基站。 切换单元 24, 用于切换至所述基站根据所述候选目标接入网确定的目标 接入网。 上述获取单元， 可以通过进行网络扫描， 获取接入网信息。 上述候选目标接入网信息至少包括候选目标接入网的网络名称。 可选的，候选目标接入网信息还可包含各候选目标接入网对应的信号质量 和 /或各候选目标接入网的优先级和 /或终端决定切换到候选目标接入网的承载 信息如承载标识（ DRB ID )。 本发明中，发送单元可通过 RRC消息将候选目标接入网信息上报至基站。 基站根据候选目标接入网信息确定目标接入网，并下发切换命令至接收单 元， 切换单元可据此切换至目标接入网。 需要说明的是， 在本发明中， 当未接收到基站发送的任何命令时， 切换单 元可默认不进行网络切换。 本发明可选实施例中， 终端还包括接收单元， 用于接收基站发送的指示消 息， 开启单元， 用于根据该指示消息开启 ANDSF。 如开启单元可根据接收的基站广播的***消息开启 ANDSF。 具体的， 接 收单元， 用于接收并读取基站广播的***消息， 然后开启单元判断是否允许开 启 ANDSF。 如果接收到一位 Boolean类型的指示， 其值为 "ture" , 则开启单 元判断允许开启 ANDSF, 从而开启 ANDSF。 若该 Boolean类型指示的值为 "false" , 则开启单元判断不允许开启 ANDSF, 则不开启 ANDSF。 本发明中另一可选实施例中， 终端还包括发送单元， 用于向基站发送请求 开启 ANDSF的请求， 如在检测到符合预设条件的接入网时， 发送单元向基站 发送上述请求。 具体的， 发送单元可通过 RRC消息发送上述请求至基站。 基 站根据上述请求返回指示消息， 该指示消息可通过 RRC消息发送。 接收单元 接收到该 RRC消息， 然后开启单元判断是否允许开启 ANDSF。如果接收到一 位 Boolean类型的指示，其值为 "ture" ,则判断允许开启 ANDSF,若该 Boolean 类型指示的值为 "false" , 则判断不允许开启 ANDSF。 其中， 上述指示消息可以是基站根据本地策略生成的，也可以是基站结合 本地策略和从核心网获取的 ANDSF信息生成的。 具体可参见实施例一中的相 关论述。 在可选实施例中， 上述接收单元， 还用于从核心网接收 ANDSF信息， 然 后获取单元根据 ANDSF信息进行网络扫描， 获取接入网信息。
获取单元可根据 ANDSF信息中的***间移动性策略和接入网络发现信息 来检测相应的网络， 如获取单元根据 ANDSF信息中的接入网络发现信息的网 络位置和网络名称， 在合适的位置打开网络发现功能， 进行网络扫描； 又如获 取单元可根据***间移动向策略优先扫描优先级高的网络。
需要说明的是，如果基站下发的指示消息中同时包含网络扫描的周期， 则 获取单元可按照该周期进行网络扫描。相对现有技术，该方式节省了终端用电。 本发明终端还可包括确定单元，用于将符合一定条件的接入网确定为候选 目标接入网， 如将符合 ANDSF信息的接入网确定为候选目标接入网。 在本发明的可选实施例中，基站可同时下发网络发现成功的条件如接入网 信号指令的门限至终端，确定单元可进一步的结合该条件，将符合该网络发现 成功的条件的接入网确定为目标接入网。 本发明中，发送单元可通过 RRC消息将候选目标接入网信息上报至基站。 进一步地，本发明实施例还提供了基站的硬件构成。可包括至少一个处理器（例 如 CPU ), 至少一个网络接口或者其他通信接口， 存储器， 和至少一个通信总 线， 用于实现这些装置之间的连接通信。处理器用于执行存储器中存储的可执 行模块， 例如计算机程序。 存储器可能包含高速随机存取存储器（RAM: Random Access Memory ), 也可能还包括非不稳定的存储器（ non- volatile memory ), 例如至少一个磁盘存储器。 通过至少一个网络接口 （可以是有线或 者无线）实现该***网关与至少一个其他网元之间的通信连接， 可以使用互联 网， 广域网， 本地网， 城域网等。
参见图 5 , 在一些实施方式中， 存储器中存储了程序指令， 程序指令可以 被处理器执行， 其中， 程序指令可包括指示单元 31、 接收单元 32、 切换单元 33 , 或者程序指令还可包括发送单元 34、 处理单元 35。 各单元的具体实现可 参见实施例二所揭示的相应单元， 这里不再赘述。处理器用于根据上述程序指 令执行如下步骤： 指示终端开启接入网发现和选择功能 ANDSF, 用于所述终端通过所述
ANDSF获取接入网信息， 所述接入网信息包括候选目标接入网信息； 接收所述终端发送的所述候选目标接入网信息； 和 根据所述候选目标接入网信息确定目标接入网，并将所述终端切换至所述 目标接入网。 该处理器还可根据上述程序指令执行上述基站侧方法实施例的其他步骤。 本发明实施例还提供了终端的硬件构成。可包括至少一个处理器（例如 CPU ), 至少一个网络接口或者其他通信接口， 存储器， 和至少一个通信总线， 用于实 现这些装置之间的连接通信。处理器用于执行存储器中存储的可执行模块， 例 如计算机程序。 存储器可能包含高速随机存取存储器（RAM: Random Access Memory ), 也可能还包括非不稳定的存储器（ non- volatile memory ), 例如至少 一个磁盘存储器。 通过至少一个网络接口 （可以是有线或者无线）实现该*** 网关与至少一个其他网元之间的通信连接，可以使用互联网，广域网，本地网， 城域网等。
参见图 6, 在一些实施方式中， 存储器中存储了程序指令， 程序指令可以 被处理器执行， 其中， 程序指令可包括开启单元 41、 获取单元 42、 发送单元 43、 切换单元 44, 或者程序指令还可包括接收单元 45。 各单元的具体实现可 参见实施例四所揭示的相应单元， 这里不再赘述。处理器用于根据上述程序指 令执行如下步骤： 根据基站的指示开启接入网发现和选择功能 ANDSF; 通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接入网 信息； 发送所述候选目标接入网信息至所述基站； 切换至所述基站根据所述候选目标接入网信息所确定的目标接入网。
该处理器还可根据上述程序指令执行上述终端侧方法实施例的其他步骤。 本发明还提供了一种切换***， 参见图 7, 包括至少一个基站 51和至少 一个上述终端 52。
其中， 上述基站， 用于指示终端开启 ANDSF, 接收终端发送的候选目标 接入网信息， 并根据候选目标接入网信息确定目标接入网，指示终端切换至目 标接入网。
上述终端， 用于根据基站的指示开启 ANDSF, 进行网络扫描， 获取接入 网信息，确定候选目标接入网信息并发送候选目标接入网信息指基站，切换至 基站发送的目标接入网。 其中， 终端可根据从核心网获取的 ANDSF信息进行 网络扫描获取接入网信息并确定候选目标接入网。
在本发明的可选实施例中，基站还用于发送指示消息至终端， 终端还用于 接收该指示消息并根据该消息开启 ANDSF, 进行网络扫描获取接入网信息。
本发明中， 基站可用于通过广播***消息下发上述指示消息。
在另一实施例中， 终端可发送请求开启 ANDSF的请求至基站， 基站用于 根据该请求下发上述指示消息， 具体的终端可通过 RRC消息发送请求， 基站 可通过 RRC消息下发指示消息。
其中， 上述指示消息可以基站根据本地策略生成的，也可以是基站结合本 地策略和从核心网获取的 ANDSF信息生产的。 当目标接入网的基站与上述基站均为 3GPP网络的基站时，在切换过程中， 基站还用于将指示消息、 ANDSF信息中的至少一种发送至目标接入网的基站， 以便目标接入网的基站能够据此做下一步无线资源管理（ Radio Resource Management,RRM )策略， 而且该方式也有利于节省空开开支。 以下为本发明中的一种具体应用场景， 其中， 终端当前所在的接入网为 LTE。 具体过程如下： 终端向核心网发送 ANDSF信息的请求消息。 核心网在接收到该请求后将该 ANDSF信息下发至终端。 其中 ANDSF信息 中定义了 LTE网络的优先级高于 WLAN网络， 接入网发现信息中包含了接入网 LTE2、 WLAN 1和 WLAN2、 WLAN3的名称以及四个接入网的位置。 终端接着向基站发送开启网络发现功能请求消息。 常见的为， 终端根据 ANDSF信息发现达到网络发现的条件， 则向基站发送网络发现请求消息。 其 中发现达到网络发现的条件有进入 ANDSF信息中接入网发现信息所指示的接 入网位置 (如经纬度)，或者进入 ANDSF信息中接入网发现信息所指示的接入网 的网络名称 (如 LTE的小区 ID)。 终端可基于 RRC消息向基站发送网络发现请求 消息。 基站通过检测， 发现当前 LTE1网络的负载过重， 而且覆盖范围内有可用 的 WLAN网络， 于是设置一位 Boolean类型的指示， 并将值设置为， ture，， 通过 RRC消息将该指示下发至终端。 另夕卜，基站同时下发了网络扫描周期为 1小时， 网络发现成功的条件为网络信号质量不低于1\ 终端获取该 RRC消息， 并通过 Boolean类型指示的值判断到基站允许其开 启网络发现功能。 于是终端每隔一小时根据 ANDSF信息中接入网发现信息中 的网络位置和网络名称， 在合适的位置打开网络发现功能， 进行网络扫描， 并 根据***间移动向策略来优先扫描优先级高的网络及 LTE网络。 终端经扫描检测到 LTE2、 WLAN1和 WLAN2三个网络， 并发现 LTE2、 WLAN1网络信号质量 Tl、 Τ2均高于 Τ, 且 Τ2大于 Tl , WLAN2网络信号质量 Τ3低于 Τ。 于是根据网络发现成功条件将 LTE2、 WLAN1确定为候选接入网。 终端根据 ANDSF信息中定义的优先级顺序将候选接入网的信息按照 LTE2、 WLAN1的顺序上报至基站。 其中上报的信息包括候选接入网的名称 ( LTE2、 WLAN1 )、 位置、 网络信号质量（Tl、 Τ2 ) 以及终端决定的要切换 到目标接入网的数据承载标识 DRB ID1。 基站根据 DRB ID1的 QoS参数判断到该 DRB需要的带宽较大， 只有
WLAN1的带宽可满足。 于是， 基站将 WLAN1确定为目标接入网， 并下发切换 指示至终端。 终端获取该指示， 然后将 DRB ID1对应的承载业务路由到 WLAN1网络。 以上为终端由 LTE切换到 WLAN网络， 在实际应用中， 终端还可以根据需 要由 WLAN切换到 LTE网络。 具体过程用上， 此处不再详述。 尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基 本创造性概念， 则可对这些实施例做出另外的变更和修改。 所以， 所附权利要 求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及 其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种切换方法， 其特征在于， 包括： 基站指示终端开启接入网发现和选择功能 ANDSF, 用于所述终端通过所 述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接入网信息； 所述基站接收所述终端发送的所述候选目标接入网信息； 和 所述基站根据所述候选目标接入网信息确定目标接入网，并将所述终端切 换至所述目标接入网。
2、 如权利要求 1所述的方法， 其特征在于， 所述基站指示终端开启 ANDSF, 具体包括： 所述基站向所述终端发送指示消息，所述指示消息用于指示所述终端是否 开启所述 ANDSF; 所述基站通过所述指示消息指示所述终端开启所述 ANDSF。
3、 如权利要求 1或 2所述的方法， 其特征在于， 还包括： 所述基站根据以下至少一种情况确定指示所述终端开启所述 ANDSF: 所述基站的负载量大于第一预设门限或所述终端的移动速度低于第二预 设门限； 所述基站根据以下至少一种情况确定指示所述终端保持所述 ANDSF的关 闭状态： 所述基站确认不存在可切换的接入网或所述终端的移动速度高于第三预 设门限。
4、 如权利要求 3所述的方法， 其特征在于， 还包括： 所述基站接收核心网发送的 ANDSF信息； 所述基站根据所述 ANDSF信息进一步确认是否指示所述终端开启所述 ANDSF。
5、 如权利要求 1或 2所述的方法， 其特征在于， 还包括： 所述基站接收所述终端发送的请求，所述请求用于请求所述基站指示所述 终端开启所述 ANDSF。
6、 如权利要求 1至 5任一项所述的方法， 其特征在于： 当所述基站和所述目标接入网的基站均为 3GPP网络的基站时，在切换过 程中， 所述基站还将以下至少一种发送至所述目标接入网的基站： 所述指示消息； 所述 ANDSF信息。
7、 一种基站， 其特征在于， 包括： 指示单元， 用于指示终端开启接入网发现和选择功能 ANDSF, 用于所述 终端通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接入网 信息； 接收单元， 用于接收所述终端发送的所述候选目标接入网信息； 和 切换单元， 用于根据所述候选目标接入网信息确定目标接入网， 并将所述 终端切换至所述目标接入网。
8、 如权利要求 7所述的基站， 其特征在于， 还包括： 发送单元， 用于向所述终端发送指示消息， 所述指示消息用于指示所述终 端是否开启所述 ANDSF。
9、 如权利要求 7或 8所述的基站， 其特征在于， 还包括： 处理单元， 用于根据以下至少一种情况确定指示所述终端开启所述 ANDSF: 基站的负载量大于第一预设门限或所述终端的移动速度低于第二预设门 限； 或 用于根据以下至少一种情况确定指示所述终端保持所述 ANDSF的关闭状 态： 确认不存在可切换的接入网或所述终端的移动速度高于第三预设门限。
10、 如权利要求 9所述的基站， 其特征在于： 所述接收单元， 还用于接收核心网发送的 ANDSF信息； 所述处理单元，还用于根据 ANDSF信息进一步确认是否指示所述终端开 启所述 ANDSF。
11、 如权利要求 7或 8所述的基站， 其特征在于： 所述接收单元，还用于接收所述终端发送的请求， 所述请求用于请求所述 指示单元指示所述终端开启所述 ANDSF。
12、 如权利要求 8至 11任一项所述的基站， 其特征在于： 当所述基站和所述目标接入网均为处于 3GPP网络时， 在切换过程中， 所 述发送单元， 还用于将以下至少一种发送至所述目标接入网： 所述指示消息； 所述 ANDSF信息。
13、 一种切换方法， 其特征在于， 包括： 终端根据基站的指示开启接入网发现和选择功能 ANDSF; 终端通过所述 ANDSF获取接入网信息， 所述接入网信息包括候选目标接 入网信息； 所述终端发送所述候选目标接入网信息至所述基站； 所述终端切换至所述基站根据所述候选目标接入网信息所确定的目标接 入网。
14、 如权利要求 13所述的方法， 其特征在于， 终端根据基站的指示开启 接入网发现和选择功能 ANDSF, 具体包括： 所述终端接收所述基站发送的指示消息，所述指示消息用于指示所述终端 是否开启 ANDSF; 所述终端根据所述指示消息开启所述 ANDSF。
15、 如权利要求 13或 14所述的方法， 其特征在于， 还包括： 所述终端发送请求至所述基站， 其中， 所述请求用于请求所述基站指示所 述终端开启所述 ANDSF。
16、 如权利要求 13-15任一项所述的方法， 其特征在于： 当所述基站的负载量大于第一预设门限或所述终端的移动速度低于第二 预设门限时， 所述指示消息用于指示所述终端开启所述 ANDSF; 当所述基站确认不存在可切换的所述目标接入网或所述终端的移送速度 高于第三预设门限时， 所述指示消息用于指示所述终端保持所述 ANDSF的关 闭状态。
17、 如权利要求 16所述的方法， 其特征在于， 所述指示消息为所述基站 根据核心网发送的 ANDSF信息生成。
18、 一种终端， 其特征在于， 包括： 开启单元， 用于根据基站的指示开启接入网发现和选择功能 ANDSF; 获取单元， 用于通过所述 ANDSF获取接入网信息， 所述接入网信息包括 候选目标接入网信息； 发送单元， 用于发送所述候选目标接入网信息至所述基站； 切换单元，用于切换至所述基站根据所述候选目标接入网确定的目标接入
19、 如权利要求 18所述的终端， 其特征在于， 还包括： 接收单元， 用于接收所述基站发送的指示消息， 所述指示消息用于指示所 述终端是否开启 ANDSF。
20、 如权利要求 18或 19所述的终端， 其特征在于： 所述发送单元， 还用于发送请求至所述基站， 其中， 所述请求用于请求所 述基站指示所述终端开启所述 ANDSF。
21、 如权利要求 18至 20任一项所述的终端， 其特征在于， 当所述基站的负载量大于第一预设门限或所述终端的移动速度低于第二 预设门限时， 所述指示消息用于指示所述终端开启所述 ANDSF; 当所述基站确认不存在可切换的接入网或所述终端的移送速度高于第三 预设门限时， 所述指示消息用于指示所述终端保持所述 ANDSF的关闭状态。
22、 如权利要求 21所述的终端， 其特征在于， 所述指示消息为所述基站 根据核心网发送的 ANDSF信息生成。
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