WO2014161172A1 - Procédé de commutation, station de base et terminal - Google Patents

Procédé de commutation, station de base et terminal 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
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English (en)
Chinese (zh)
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 PCT/CN2013/073701 priority Critical patent/WO2014161172A1/fr
Priority to CN201380002674.9A priority patent/CN104969622B/zh
Publication of WO2014161172A1 publication Critical patent/WO2014161172A1/fr

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

Abstract

L'invention concerne un procédé de commutation, une station de base et un terminal. Le procédé comprend les étapes suivantes : une station de base indique à un terminal d'activer une fonction de découverte et de sélection de réseau d'accès (ANDSF) (S11), utilisée pour que le terminal obtienne des informations de réseau d'accès par le biais de l'ANDSF, les informations de réseau d'accès comprenant des informations de réseau d'accès cible candidat; la station de base reçoit les informations de réseau d'accès cible candidat envoyées par le terminal (S12); et la station de base détermine un réseau d'accès cible en fonction des informations de réseau d'accès cible candidat et commute le terminal vers le réseau d'accès cible (S13). Grâce à la solution technique, la station de base peut avoir une commande sur le terminal et l'aptitude à la commande du terminal est améliorée.
PCT/CN2013/073701 2013-04-03 2013-04-03 Procédé de commutation, station de base et terminal WO2014161172A1 (fr)

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PCT/CN2013/073701 WO2014161172A1 (fr) 2013-04-03 2013-04-03 Procédé de commutation, station de base et terminal
CN201380002674.9A CN104969622B (zh) 2013-04-03 2013-04-03 一种切换方法、基站及终端

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PCT/CN2013/073701 WO2014161172A1 (fr) 2013-04-03 2013-04-03 Procédé de commutation, station de base et terminal

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