WO2009115015A1 - Procédé de découverte et de sélection de réseau, système de réseau et dispositif de communication - Google Patents

Procédé de découverte et de sélection de réseau, système de réseau et dispositif de communication Download PDF

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Publication number
WO2009115015A1
WO2009115015A1 PCT/CN2009/070741 CN2009070741W WO2009115015A1 WO 2009115015 A1 WO2009115015 A1 WO 2009115015A1 CN 2009070741 W CN2009070741 W CN 2009070741W WO 2009115015 A1 WO2009115015 A1 WO 2009115015A1
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Prior art keywords
network
andsf
vandsf
handsf
information
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PCT/CN2009/070741
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English (en)
Chinese (zh)
Inventor
于益俊
王珊珊
胡颖
张谦
张进
吴问付
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华为技术有限公司
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Publication of WO2009115015A1 publication Critical patent/WO2009115015A1/fr

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    • 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

Definitions

  • Network discovery and selection method network system and communication device
  • the present invention relates to the field of communications technologies, and in particular, to a network discovery and selection method, a network system, and a communication device.
  • EPS evolved packet system
  • LTE Long Term Evolution
  • 3GPP The 3rd Generation Partnership Project
  • An important feature of EPS is the consideration of convergence of multiple access methods, allowing non-3GPP (non-3GPP) networks to access EPS networks.
  • the non-3GPP networks described here include WiMax (Worldwide Interoperability for Microwave Access). In), WLAN (Wireless Local Area Network), CDMA (Code Division Multiple Access), and the like.
  • WiMax Worldwide Interoperability for Microwave Access
  • WLAN Wireless Local Area Network
  • CDMA Code Division Multiple Access
  • the prior art proposes a unified network discovery and selection concept, that is, after the user terminal UE accesses the network, an ANDSF (Access Network Discovery and Selection Function) in the network is accessed.
  • ANDSF Access Network Discovery and Selection Function
  • Network status information (such as load status, etc.) of the relevant access network
  • selecting the UE according to the relevant policies of the operator such as the access network mode available to the current UE
  • the signal conditions of the surrounding network collected by the UE.
  • a target network when the conditions are met, the user can switch to other access networks.
  • the UE may connect to the ANDSF through 3GPP access or trusted and untrusted non-3GPP access, and the ANDSF may connect to the non-3GPP access network to collect the load of the network. Information such as status.
  • the roaming UE when the roaming UE registers with the network, it can simultaneously select the vANDSF of the visited place and the hANDSF of the home location, and obtain relevant policy information and network status information from the hANDSF and the vANDSF respectively, and complete network discovery and selection processing.
  • the technical problem to be solved by the embodiments of the present invention is to provide a network discovery and selection method, a network system, and a communication device, which can more easily implement network discovery and selection processing.
  • the embodiment of the present invention provides a network discovery and selection method, including: after the user terminal accesses the network, the first access network discovery and selection function entity ANDSF acquires network status information by interacting with the second ANDSF; The ANDSF sends the acquired network status information to the user terminal for target network selection, or the acquired network status information is used by the user terminal to select a target network.
  • An embodiment of the present invention provides a network system, including: a first access network discovery and selection function entity ANDSF, configured to acquire network status information by interacting with a second ANDSF after the user terminal accesses the network, and the network is The status information is sent to the user terminal for target network selection, or the target network is selected for the user terminal according to the network status information; and the second access network discovery and selection function entity ANDSF is configured to perform with the first ANDSF Information exchange.
  • a first access network discovery and selection function entity ANDSF configured to acquire network status information by interacting with a second ANDSF after the user terminal accesses the network, and the network is The status information is sent to the user terminal for target network selection, or the target network is selected for the user terminal according to the network status information
  • the second access network discovery and selection function entity ANDSF is configured to perform with the first ANDSF Information exchange.
  • An embodiment of the present invention provides a communication apparatus, including: an interaction unit, configured to acquire network status information by interacting with another access network discovery and selection function entity ANDSF after the user terminal accesses the network; Sending the network status information to the user terminal for target network selection, or selecting a target network for the user terminal according to the network status information.
  • the network status information is obtained through interaction between the different access network discovery and the selection function entity ANDSF, so the user terminal only needs to access one of the network status information.
  • the ANDSF can obtain the network status information obtained after the information exchange on the network side through the ANDSF, and perform corresponding processing, or obtain the target network information selected according to the interaction result after the information exchange on the network side, thereby being more simple to implement. Network discovery and selection processing.
  • FIG. 1 is a schematic diagram of a network architecture according to Embodiment 1 of the present invention.
  • FIG. 2 is a flow chart of a method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a UE actively initiating a request in a method according to an embodiment of the present invention
  • 4 is a flowchart of an ANDSF actively transmitting information to a UE in a method according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a handover decision performed by a vANDSF in a method according to an embodiment of the present invention
  • FIG. 6 is a method according to Embodiment 1 of the present invention
  • a flowchart of the handover decision is completed by the hANDSF
  • FIG. 7 is a flowchart of the handover decision from the vANDSF to the hANDSF in the method according to the embodiment of the present invention
  • FIG. 8 is a schematic diagram of a network architecture according to Embodiment 2 of the present invention.
  • FIG. 10 is a flowchart of a UE actively initiating a request in a method according to Embodiment 2 of the present invention.
  • FIG. 11 is a flowchart of an ANDSF actively transmitting information to a UE in a method according to Embodiment 2 of the present invention
  • FIG. 12 is a flowchart of a handover decision performed by a vANDSF in a method according to Embodiment 2 of the present invention
  • FIG. 13 is a method according to Embodiment 2 of the present invention
  • FIG. 14 is a flowchart of a handover decision made by the hANDSF to the hANDSF in the method of the second embodiment of the present invention
  • FIG. 15 is a schematic diagram of a network architecture of Embodiment 3 of the present invention.
  • FIG. 17 is a schematic structural diagram of a network system according to an embodiment of the present invention.
  • FIG. 18 is a schematic structural diagram of a network system according to an embodiment of the present invention.
  • FIG. 19 is a schematic structural diagram of a communication apparatus according to an embodiment of the present invention.
  • the UE only needs to be connected to one of the ANDSFs to obtain relevant information, thereby facilitating network discovery and selection processing.
  • information interaction between the visited place and the ANDSF of the home place mainly has two forms, one is an interface for newly interacting between the vANDSF and the hANDSF, and information is exchanged, and the other way is to utilize the existing
  • the interface of the PCRF Policy Charging Rule Function
  • the vANDSF can be connected to the vPCRF
  • the vPCRF is connected to the hPCRF
  • the hANDSF can be connected to the hPCRF.
  • the interface of the interaction between the vANDSF and the hANDSF in the embodiment of the present invention is called Sz connection.
  • the ANDSF of the local network may be selected, that is, when the UE is at the home location, the hANDSF is selected, when the UE roams, the vANDSF is selected, and the selected ANDSF decides whether it is necessary to select one for the UE to pass the Sz.
  • the ANDSF of the interface connection When the UE accesses the system, the ANDSF of the local network may be selected, that is, when the UE is at the home location, the hANDSF is selected, when the UE roams, the vANDSF is selected, and the selected ANDSF decides whether it is necessary to select one for the UE to pass the Sz.
  • the ANDSF of the interface connection When the UE accesses the system, the ANDSF of the
  • the vANDSF may select the hANDSF for the identity of the UE, and the vANDSF and the hANDSF communicate through the Sz interface, and the UE only interacts with the directly connected vANDSF, and the vANDSF may be regarded as a proxy of the hANDSF.
  • FIG. 1 is a schematic diagram of a network architecture according to Embodiment 1 of the present invention.
  • vANDSF and hANDSF communicate through the new Sz interface; roaming UEs select vANDSF (when roaming selects the visited network, when roaming selects the home network).
  • the vANDSF communicates with the UE through the Sx interface; the hANDSF and the vANDSF obtain information such as the network status of other access systems in the network through the Sy interface.
  • hANDSF connects to vANDSF through the Sz interface, and obtains information such as the network status of the visited network through vANDSF.
  • FIG. 2 it is a flowchart of a method according to an embodiment of the present invention.
  • the UE is in the visited network and accesses the vANDSF.
  • FIG. 2 includes:
  • the UE performs a registration process to complete registration to a specific access network.
  • an attach procedure can be performed to register to a 3GPP network, a WiMax network, or the like.
  • the UE performs DNS (Domain Name Service) resolution or DHCP.
  • DNS Domain Name Service
  • the process obtains the address of the ANDSF, and the DNS server or the DHCP server returns the address of the configured ANDSF of the local network to the UE;
  • the ANDSF of the local network in which it is located is the vANDSF of the roaming place. If the address of the ANDSF of the local network in which the UE is located has been recorded in the UE, the DNS resolution or DHCP step does not need to be performed.
  • the UE initiates a registration process to the vANDSF, and requests a service from the vANDSF.
  • the registration process may be an explicit registration initiated by the UE, such as sending a registration request message to the vANDSF, or may be an implicit registration, such as the UE sending a policy request message to the vANDSF or sending a surrounding network. Measurement report of the network, etc. If the UE records the address of the home address hANDSF (which may be UE pre-configuration or network dynamic provisioning), the message carries the address of the hANDSF to the vANDSF.
  • the vANDSF can establish and maintain a context for the UE to record relevant information.
  • the vANDSF registers the UE to the hANDSF
  • the vANDSF finds that the UE is a roaming user, and according to the attribution information provided by the UE,
  • the UE selects a hANDSF, for example, may perform a DNS resolution according to the hPLMN ID of the UE (home Public Land Mobile Network) to obtain a hANDSF address, or a hANDSF address provided by the UE determines a hANDSF for the UE, and then The hANDSF initiates a registration procedure to register the UE with the hANDSF.
  • a DNS resolution according to the hPLMN ID of the UE (home Public Land Mobile Network) to obtain a hANDSF address, or a hANDSF address provided by the UE determines a hANDSF for the UE, and then The hANDSF initiates a registration procedure to register the UE with the hANDSF.
  • the registration process may be an explicit registration, such as the vANDSF sending a registration request message to the hANDSF; or an implicit registration, such as the vANDSF sending a policy request message to the hANDSF or transmitting a measurement report of the surrounding network.
  • the hANDSF can establish and maintain a context for the UE to record related information.
  • the 305 Perform related processing of network discovery and selection between the UE, the hANDSF, and the vANDSF.
  • the network discovery is different from the decision-making body of the selection, and can be divided into several situations.
  • the ANDSF provides policy information and/or related network state information to the UE, and the UE determines, according to the information provided by the ANDSF, whether handover needs to be made and which destination network to switch to.
  • the hANDSF sends the policy information related to the UE to the vANDSF
  • the vANDSF collects the status information of the related network according to the policy information provided by the hANDSF, and sends related policy information and network status information to the UE.
  • the UE can make a handover decision based on the information provided by the vANDSF, that is, decide whether a handover needs to be made and which destination network to switch to.
  • the process of the UE actively initiating a policy request after registering to the ANDSF is as shown in FIG. 3, including:
  • the UE sends a policy request message to the vANDSF to obtain policy information.
  • the vANDSF sends a policy request message to the hANDSF.
  • the vANDSF may obtain the network status from the relevant network, or may obtain the network status from the specific network according to the policy information provided by the hANDSF after step 403.
  • the hANDSF may send, according to the current location information of the UE, the policy information set by the home location (such as the network available for the visited place and the priority of the selection, etc.) to the vANDSF.
  • the policy information set by the home location such as the network available for the visited place and the priority of the selection, etc.
  • the vANDSF provides the UE with the policy information of the handover according to the policy information provided by the hANDSF and the status of the obtained related network.
  • the UE performs a decision according to the policy information sent by the vANDSF.
  • the UE can make a handover decision based on the information provided by the vANDSF, that is, whether or not switching needs to be made and which destination network to switch to.
  • the subsequent UE may send a policy request message to the vANDSF to obtain updated policy information, and the vANDSF and the hANDSF respectively obtain the updated information for processing.
  • the process of actively transmitting the policy information to the UE by one of the ANDSFs, for example, the hANDSF is as shown in FIG. 4, and includes:
  • the hANDSF may send, according to the current location information of the UE, the policy information set by the home location (such as the network available for the visited place and the priority of the selection, etc.) to the vANDSF;
  • the vANDSF provides the UE with the policy information of the handover according to the policy information provided by the hANDSF and the status of the obtained related network.
  • the UE performs a decision according to the policy information sent by the vANDSF.
  • the UE can make a handover decision based on the information provided by the vANDSF, that is, whether or not switching needs to be made and which destination network to switch to.
  • the vANDSF may also actively send policy information to the UE.
  • the hANDSF may send the updated policy information (such as the network available for the visited place and the selection priority, etc.) to the vANDSF.
  • the vANDSF may send the related information to the UE in the policy update message, and the UE completes the subsequent handover process according to the updated policy information.
  • the UE reports the measurement report of the neighboring network to the ANDSF, and the ANDSF performs the handover decision for the UE according to the handover policy of the UE and the measurement report reported by the UE, and sends the decision result to the UE, and the UE completes the result according to the result. Subsequent switching processing. In this case, the UE does not need to obtain the policy information sent by the ANDSF, and directly receives the decision result delivered by the ANDSF for processing.
  • the vANDSF is the final decision point of the handover
  • the hANDSF provides the vANDSF with the policy information required for the UE handover (such as the network available for the visit and the priority of the selection, etc.)
  • the vANDSF collects the state information of the relevant network (such as the current The load condition of the network)
  • the UE reports the measurement report of the surrounding network to the vANDSF.
  • the vANDSF performs a handover decision for the UE based on the information obtained above, and transmits a handover decision (e.g., to which target network to switch to) to the UE.
  • the UE sends a measurement report to the vANDSF.
  • the vANDSF sends a policy request message to the hANDSF.
  • a policy request message is sent to the hANDSF.
  • the vANDSF After receiving the measurement report of the UE, the vANDSF can immediately obtain the network status information from the relevant network. 603.
  • the hANDSF may send, according to the current location information of the UE, the policy information (such as the available network and the priority of the visit) to the vANDSF.
  • the vANDSF collects the status of the related network according to the policy information provided by the hANDSF, performs a handover decision, and sends the decision result to the UE, where the UE performs subsequent handover processing according to the decision result.
  • the related network status may be the information already saved in the vANDSF, or the vANDSF may initiate the status acquisition process to obtain the updated network status.
  • the vANDSF obtains the policy information provided by the hANDSF, which may be obtained through a separate process in steps 602 and 603, or may obtain the policy information provided by the hANDSF during the UE registration process.
  • the hANDSF may send the updated policy information (such as the network available for the visited place and the selection priority, etc.) to the vANDSF.
  • the vANDSF makes a handover decision for the UE, and sends a handover decision (such as which target network to switch to) to the UE.
  • the vANDSF cannot complete the handover decision, for example, when the UE is at the boundary of the visited network and is about to switch to another network, the access network controlled by the vANDSF cannot meet the handover requirement of the UE, and is required at this time.
  • the access network information of the other network is selected and sent to the UE to guide the UE to switch to the new network.
  • the vANDSF cannot obtain the information of the destination network, so the vANDSF needs the help of hANDSF, and can perform the following process:
  • the UE When the vANDSF is unable to complete the handover decision, the UE sends a policy request message to the hANDSF, requesting the hANDSF to provide access network resources of other networks (distinguished from the current visited network) where the current UE is located; hANDSF according to the current location of the UE, according to the operator policy Selecting available access network resource information of the other network (new visited network or home network) at the current location, and providing the status of the relevant access network, such as load status, through the vANDSF of the network where the access network is located, and The status of the information and access network is sent to the vANDSF that initiated the request. After receiving the information, the vANDSF performs a handover decision to select a handover target network for the UE. In addition, if the UE needs to migrate to the network, the hANDSF can directly obtain the access network status of the network, and does not need to obtain the information through the new vANDSF.
  • the hANDSF is the final handover decision point, and the vANDSF forwards the measurement report reported by the UE to the hANDSF, and reports the network status of the visited network to the hANDSF.
  • the UE sends a measurement report to the vANDSF.
  • the vANDSF forwards the measurement report to the hANDSF, where the message may also carry status information of the related network, such as a load status.
  • the hANDSF may perform a handover decision according to the measurement report reported by the UE, the status information of the related network that is provided by the vANDSF or saved in the hANDSF, and the operator policy, and select the destination network for the handover, and send the decision result to the vANDSF.
  • the hANDSF may also decide to switch to another visited network or a home network according to the measurement report reported by the UE.
  • the hANDSF may acquire available access network information from the vANDSF or the local hANDSF of the other visited network, and select an appropriate access network of the other visited network or the home network for the UE, and send the decision result to the vANDSF.
  • the vANDSF sends the decision result provided by the hANDSF to the UE, where the UE performs subsequent handover processing according to the decision result.
  • the hANDSF can still send the policy information to the vANDSF, and the vANDSF can report the network status according to the policy information (such as the subscribed access network and priority).
  • switching decisions may be made by hANDSF under certain circumstances.
  • the vANDSF fails to make a handover decision for the UE, the hANDSF is required to perform the handover decision, and the handover decision point is changed to hANDSF. After the hANDSF performs the handover decision, the decision result is sent to the UE through the vANDSF.
  • the UE sends a measurement report to the vANDSF.
  • the vANDSF cannot perform a handover decision for the UE, and then sends a handover request message to the hANDSF, requesting the hANDSF to perform a handover decision, where the handover request message may carry the measurement report provided by the UE;
  • the hANDSF returns a decision result to the vANDSF.
  • the hANDSF selects available access network resource information of other networks (other visited networks or home networks) of the current location according to the current location information of the UE, and provides related access through the vANDSF of the network where the access networks are located.
  • the status of the network such as the load status, performs a handover decision for the UE based on the measurement report provided by the UE, and sends the result of the handover decision to the vANDSF.
  • the vANDSF sends the decision result provided by the hANDSF to the UE, and the UE performs a subsequent handover operation according to the result.
  • This processing method is basically similar to the process of making decisions entirely by ANDSF, except that Before the UE reports the measurement report, the ANDSF needs to send the policy information to the UE first, and then the UE reports the measurement report according to the policy information.
  • the ANDSF described herein may be a vANDSF or a hANDSF 0 ANDSF, and may provide policy information to the UE during the first registration process of the UE, or actively provide the UE after the policy information changes.
  • the policy information provided by the ANDSF to the UE may generally include: a specified access network, a reported threshold or frequency, and the like.
  • the UE monitors the specified network according to the information. When the related data reaches the reporting threshold, the UE reports the measurement report of the specified network to the ANDSF.
  • the decision processing of ANDSF and the processing under the decision of ANDSF it is not consistent here.
  • the UE only needs to access the vANDSF, and the network status information obtained by the information exchange between the vANDSF and the hANDSF through the new interface is obtained by the vANDSF, thereby performing corresponding processing, or obtaining the vANDSF and the hANDSF.
  • the network information is selected based on the interaction result after the information is exchanged with the new interface, so that the network discovery and selection processing can be realized more simply.
  • FIG. 8 is a schematic diagram of a network architecture according to Embodiment 2 of the present invention.
  • the main difference between the network structure of the second embodiment and the first embodiment is that the UE in the second embodiment accesses the hANDSF.
  • the ANDSF of the home network can always be selected, and the selected hANDSF decides whether it is necessary to select an ANDSF that can be connected through the Sz interface for the UE.
  • the access network such as 3GPP or Wimax
  • the ANDSF of the home network can always be selected, and the selected hANDSF decides whether it is necessary to select an ANDSF that can be connected through the Sz interface for the UE.
  • hANDSF is selected.
  • the hANDSF can select a vANDSF of the visited network according to the current location of the UE and the like.
  • the vANDSF and the hANDSF communicate through the Sz interface, and the UE only interacts with the directly connected hANDSF, and the vANDSF can be hANDSF. Provide access network information, and even make switching decisions.
  • the network architecture of the second embodiment of the present invention describes the case where the UE registers with the hANDSF in the roaming condition. When the UE roams, the ANDSF of the home location is always found.
  • the vANDSF and hANDSF communicate via the new Sz interface.
  • the roaming UE selects the ANDSF of the home location, that is, hANDSF; the hANDSF communicates with the UE through the Sx interface; the vANDSF obtains information such as the network status of other access systems in the network through the Sy interface.
  • hANDSF connects to vANDSF through the Sz interface, and obtains information such as the network status of the visited network through vANDSF.
  • FIG. 9 is a flowchart of a method according to Embodiment 2 of the present invention.
  • the UE is roaming.
  • the hANDSF is accessed, so the flowchart of the second embodiment is basically the same as the process of the flowchart of the first embodiment, except that the positions of the vANDSF and the hANDSF in the flowchart change, and the corresponding flow produces some changes.
  • Figure 9 includes:
  • the UE performs a registration process to complete registration to a specific access network.
  • an attach procedure can be performed to register to a 3GPP network, a WiMax network, or the like.
  • the UE performs a DNS resolution or a DHCP process to obtain an address of the ANDSF from a DNS server or a DHCP server. If the address of the hANDSF has been recorded in the UE, the DNS resolution or DHCP step is not required to be performed.
  • the UE initiates a registration process to the hANDSF, and requests a service from the hANDSF.
  • the registration process may be an explicit registration initiated by the UE, such as sending a registration request message to the hANDSF, or an implicit registration, such as the UE sending a policy to the hANDSF. Request a message or send a measurement report of a surrounding network, etc.
  • the hANDSF can establish and maintain a context for the UE, recording relevant information.
  • the information (e.g., the PLMN ID of the visited network) selects a vANDSF for the visited location for the UE, and then initiates a registration procedure with the vANDSF to register the UE with the vANDSF.
  • the registration process may be an explicit registration, such as the hANDSF sending a registration request message to the vANDSF; or an implicit registration, such as the hANDSF sending a policy request message to the vANDSF or transmitting a measurement report of the surrounding network.
  • the vANDSF can establish and maintain a context for the UE to record relevant information.
  • the ANDSF provides policy information and/or related network state information to the UE, and the UE determines, according to the information provided by the ANDSF, whether handover needs to be made and which destination network to switch to.
  • the hANDSF provides policy information and/or related information to the UE.
  • the network status information (this information can be provided by the vANDSF to the hANDSF), and the UE can make a handover decision according to the information provided by the hANDSF, that is, whether the handover needs to be made and which destination network to switch to.
  • the process of the UE actively initiating a policy request after registering to the ANDSF is as shown in FIG. 10, including:
  • the UE sends a policy request message to the hANDSF to obtain policy information.
  • the message may include current location information of the UE, and the like.
  • the hANDSF After receiving the policy request message, the hANDSF sends a policy request message to the vANDSF to obtain the status of the related network.
  • the message sent to the vANDSF may include current location information of the UE, and may also include policy information provided by the hANDSF to the vANDSF.
  • the vANDSF may obtain the status of the network according to the current location information of the UE and/or the policy information provided by the hANDSF, and send the status to the hANDSF.
  • the hANDSF provides the UE with the switched policy information according to the policy information and the status of the related network provided by the vANDSF.
  • the UE performs a decision according to the policy information sent by the hANDSF.
  • the UE can make a handover decision based on the information provided by the hANDSF, that is, decide whether a handover needs to be made and which destination network to switch to.
  • the subsequent UE may send a policy request message to the hANDSF to obtain updated policy information, and the vANDSF and the hANDSF respectively obtain the updated information for processing.
  • the process of actively transmitting the policy information to the UE by one of the ANDSFs, for example, the vANDSF is as shown in FIG. 11, and includes:
  • the collected network status may be actively sent to the hANDSF;
  • the hANDSF provides the UE with the handover policy information according to the policy information and the status of the related network provided by the vANDSF; 1203.
  • the UE performs a decision according to the policy information sent by the hANDSF.
  • the UE can make a handover decision based on the information provided by the hANDSF, that is, decide whether a handover needs to be made and which destination network to switch to.
  • the hANDSF may also actively send the policy information to the UE.
  • the hANDSF may update the updated policy information (such as the network available at the visited place) And selecting the priority, etc.) and the network status are sent to the UE, and the UE completes the subsequent handover process according to the updated policy information.
  • the UE reports the measurement report of the neighboring network to the ANDSF, and the ANDSF performs the handover decision for the UE according to the handover policy of the UE and the measurement report reported by the UE, and sends the decision result to the UE, and the UE completes the result according to the result. Subsequent switching processing. In this case, the UE does not need to obtain the policy information sent by the ANDSF, and directly receives the decision result delivered by the ANDSF for processing.
  • vANDSF is the final decision point for the switch.
  • the UE reports the measurement report of the surrounding network to the hANDSF, and the hANDSF forwards the measurement report of the UE to the vANDSF and provides the policy information required for the UE handover (such as the network available for the visited place and the priority of the selection), and the vANDSF collects the status information of the related network. (such as the current network load situation).
  • the vANDSF performs a handover decision for the UE based on the information obtained above, and transmits a handover decision (e.g., to which target network to switch to) to the UE.
  • the UE sends a measurement report to the hANDSF.
  • the hANDSF forwards the measurement report to the vANDSF, where the message may also carry the location information of the current UE, and the policy information of the operator, and the like;
  • the vANDSF collects the status of the related network according to the location information and the policy information of the UE, and may also perform the handover decision by using the saved status information of the related network and the measurement report reported by the UE, and select the destination network for the handover for the UE, and The decision result is sent to hANDSF; 1304.
  • the hANDSF sends the decision result provided by the vANDSF to the UE, and the UE performs subsequent handover processing according to the decision result.
  • the hANDSF may send the updated policy information (such as the network available for the visited place and the selection priority, etc.) to the vANDSF.
  • the vANDSF makes a handover decision for the UE, and sends a handover decision (such as which target network to switch to) to the UE.
  • the vANDSF cannot complete the handover decision, for example, when the UE is at the boundary of the visited network and is about to switch to another network (other visited network or home network), the access network controlled by the vANDSF cannot satisfy The handover of the UE is required. At this time, the access network information of the other network needs to be selected and sent to the UE to guide the UE to switch to the new network. At this time, the vANDSF cannot obtain the information of the destination network, so the vANDSF needs the help of hANDSF and can be processed in the following two ways:
  • a processing method is: when the hANDSF receives the measurement report of the UE, and may determine the current UE in the existing visited network, the location information of the UE may be determined, and the other network according to the carrier policy is selected. Available access network resource information (other visited network or home network), and the status of the relevant access network, such as load status, can be provided through the vANDSF of the network where the access network is located, and then the policy information and the status of the access network are Send to vANDSF. After receiving the information, the vANDSF performs a handover decision to select a handover target network for the UE.
  • Another processing method is: when the vANDSF receives the measurement report sent by the hANDSF, and determines that the handover decision cannot be completed, sends a policy request message to the hANDSF, requesting the hANDSF to provide the other network where the current UE is located (distinguished from the current visited network) Access network resources of other visited networks or home networks; hANDSF selects available access network resource information of other networks in the current location according to the current location of the UE according to the current location of the UE, and can pass the vANDSF of the network where the access network is located Provides status of the associated access network, such as load conditions, and sends these policy information and the status of the access network to the vANDSF that initiated the request.
  • the vANDSF After receiving the information, the vANDSF performs a handover decision to select a handover target network for the UE. In addition, if the UE needs to migrate to the homing network, the hANDSF can directly obtain the access network status of the network without acquiring relevant information through the new vANDSF.
  • the hANDSF is the final handover decision point, and the hANDSF receives the measurement report reported by the UE, and requests the vANDSF to report the network status 4 of the visited network to the hANDSF.
  • the UE sends a measurement report to the hANDSF.
  • the hANDSF requests the vANDSF policy, and requests the vANDSF to provide policy information of the UE related network;
  • the vANDSF collects the status of the related network according to the location information and the policy information of the UE, and may also use the saved status information of the related network, and provide the network status to the hANDSF through the policy response message.
  • the hANDSF may perform a handover decision according to the measurement report reported by the UE, the status information of the related network provided by the vANDSF or saved in the hANDSF, and the operator policy, select a destination network for the handover, and send the decision result to the UE.
  • the UE performs subsequent handover processing according to the decision result.
  • step 1402 if the hANDSF adopts the stored network information, step 1402 and steps are performed.
  • the hANDSF may select another network for the UE according to the current location information of the UE.
  • the vANDSF of the other visited network or the home network and sends a policy request to the vANDSF (step 1402), requesting: obtaining information about the access network, and the newly selected vANDSF is based on the location information and policy information of the UE.
  • Etc. Collect the status of the relevant network and send it to hANDSF (as in step 1403).
  • the hANDSF can also directly obtain the information status of other access networks of the home network, and complete the decision.
  • the handover decision may be made by the hANDSF in some specific cases.
  • the hANDSF is required to perform the handover decision, and the handover decision point is changed to hANDSF.
  • the decision result is sent to the UE through the vANDSF.
  • the UE sends a measurement report to the vANDSF.
  • the hANDSF forwards the measurement report to the vANDSF, where the message may also carry the location information of the current UE, and the policy information of the operator;
  • the vANDSF fails to perform a handover decision for the UE, and sends a handover request message to the hANDSF, requesting the hANDSF to perform a handover decision, where the handover request message may carry the measurement report provided by the UE;
  • the hANDSF sends a decision result to the UE.
  • the hANDSF selects available access network resource information of other networks (other access networks or home networks) at the current location according to the current location information of the UE, and can provide related access through the vANDSF of the network where the access network is located.
  • the status of the network for example, the load status, performs a handover decision for the UE according to the measurement report provided by the UE, and sends the result of the handover decision to the UE, and the UE performs a subsequent handover operation according to the result.
  • the processing method is basically similar to the process of making the decision by the ANDSF.
  • the difference is that the ANDSF needs to send the policy information to the UE before the UE reports the measurement report, and then the UE reports the measurement report according to the policy information.
  • the ANDSF described herein may be a vANDSF or a hANDSF 0 ANDSF, and may provide policy information to the UE during the first registration process of the UE, or actively provide the UE after the policy information changes.
  • the policy information provided by the ANDSF to the UE may generally include: a specified access network, a reported threshold or frequency, and the like.
  • the UE monitors the specified network according to the information. When the related data reaches the reporting threshold, the UE reports the measurement report of the specified network to the ANDSF.
  • the decision processing of ANDSF and the processing under the decision of ANDSF it is not consistent here.
  • the UE only needs to access the hANDSF, and the network status information obtained by the information exchange between the hANDSF and the vANDSF through the new interface is obtained by the hANDSF, and corresponding processing is performed, or the hANDSF and the vANDSF are obtained.
  • the network information is selected based on the interaction result after the information is exchanged with the new interface, so that the network discovery and selection processing can be realized more simply.
  • FIG. 15 is a schematic diagram of a network architecture of Embodiment 3 of the present invention.
  • Embodiment 3 and Embodiment 1 The main difference between the network structure of the implementation two is that the implementation of the three interfaces between the vANDSF and the hANDSF does not set a new interface, but uses the interface between the PCRFs.
  • the ANDSF can be interfaced with the PCRF functional entity in the PCC (Policy Control and Charging) system, and the vPCRF of the roaming place and the hPCRF of the home location in the PCC architecture can be connected through the S9 interface. Therefore, the information exchange between the vANDSF and the hANDSF can also be implemented by using the interface.
  • the UE can select the ANDSF of the current network, and the ANDSF obtains the network policy information and the network status information through the vPCRF and the hPCRF, thereby completing the handover decision.
  • the ANDSF can obtain the current UE's policy information (such as the operator policy, the UE's service policy, and the like) from the PCRF, and can also obtain the information from another ANDSF by using the PCRF interface.
  • FIG. 15 only uses the UE to select the vANDSF as an example.
  • the UE may also select hANDSF and connect to the vANDSF through an interface between the hPCRF and the vPCRF.
  • a flowchart of a method according to Embodiment 3 of the present invention includes:
  • the UE performs a registration process to complete registration to a specific access network
  • an attach procedure can be performed to register to a 3GPP network, a WiMax network, or the like.
  • the UE performs a DNS resolution or a DHCP process to obtain an ANDSF address from a DNS server or a DHCP server, and the DNS server or the DHCP server will be configured.
  • the address of the ANDSF is returned to the UE;
  • the DNS resolution or DHCP step does not need to be performed.
  • the UE initiates a registration process to the vANDSF, and requests a service from the vANDSF.
  • the registration process may be an explicit registration initiated by the UE, such as sending a registration request message to the ANDSF, or may be an implicit registration, such as the UE sending a policy to the vANDSF. Request a message or send a measurement report of a surrounding network, etc.
  • the vANDSF can establish and maintain a context for the UE.
  • the vANDSF registers the UE to the hANDSF by using the vPCRF and the hPCRF. Corresponding processing of network discovery and selection between 1705, UE, hANDSF, vANDSF, vPCRF and hPCRF.
  • This step in this embodiment may also include three cases according to the difference between the network discovery and the selection decision body: that is, the decision is made entirely by the UE, the decision is made entirely by the ANDSF, and the UE and the ANDSF jointly decide.
  • the vANDSF requests the policy information from the vPCRF.
  • the PCRF can find the hPCRF according to the home network information of the UE, and forward the policy request sent by the vANDSF. If the hPCRF does not have the policy information of the UE, it sends a policy request to the hANDSF, requesting the hANDSF to provide related information.
  • the hANDSF may send the policy information (such as the available network and the selection priority) of the home location to the hPCRF according to the current location information of the UE, and the hPCRF sends the information obtained from the hANDSF to the vPCRF through the policy response message. And then forwarded to the vANDSF, and then the vANDSF sends the policy information to the UE, and the UE decides whether the handover is needed.
  • the UE only needs to access the vANDSF, and the network status information obtained by using the interface between the vANDSF and the hANDSF by using the existing PCRF interface is obtained by the vANDSF, so as to perform corresponding processing, or obtain the corresponding information.
  • the information about the target network selected by the vANDSF and the hANDSF after the information exchange between the existing PCRF interfaces is performed according to the interaction result, thereby enabling network discovery and selection processing to be more simple.
  • the embodiments provide a network system and apparatus.
  • FIG. 17 is a schematic structural diagram of a network system according to an embodiment of the present invention.
  • the network system includes: a first access network discovery and selection function entity ANDSF 1801, a second access network discovery and selection function entity ANDSF 1802.
  • the first access network discovery and selection function entity ANDSF 1801 is configured to acquire network status information by interacting with the second ANDSF 1802 after the user terminal accesses the network, and the network status information is used. Sending to the user terminal for target network selection, or selecting the network status information to select a target network for the user terminal.
  • the second access network discovery and selection function entity ANDSF 1802 is configured to perform information interaction with the first ANDSF 1801.
  • the first ANDSF 1801 specifically acquires network status information by interacting with the second ANDSF 1802 through a newly added signaling interface.
  • the first ANDSF 1801 is a visited vANDSF, and the second ANDSF 1802 is a home-based hANDSF; or the first ANDSF 1801 is a home-based hANDSF, and the second ANDSF 1802 is a visited vANDSF.
  • FIG. 18 it is a schematic structural diagram of a network system according to an embodiment of the present invention.
  • the network system includes: a first access network discovery and selection function entity ANDSF 1901, a second access network discovery and selection function entity ANDSF 1902, a home policy charging rule function entity hPCRF 1903, and a visited strategy. Charging rule function entity vPCRF 1904.
  • the first access network discovery and selection function entity ANDSF 1901 is configured to: after the user terminal accesses the network, acquire network condition information by interacting with the second ANDSF 1902, and send the network status information to the user terminal to perform the target.
  • the network selects or selects a target network for the user terminal according to the network status information.
  • the second access network discovery and selection function entity ANDSF 1902 is configured to perform information interaction with the first ANDSF 1901.
  • the first ANDSF 1901 specifically passes the home policy charging rule function entity hPCRF
  • An interface between the 1903 and the visited policy charging rule function entity vPCRF 1904 interacts with the second ANDSF 1902 to obtain network status information.
  • the first ANDSF 1901 is a visited vANDSF, and the second ANDSF 1902 is a home-based hANDSF; or the first ANDSF 1901 is a home-based hANDSF, and the second ANDSF 1902 is a visited vANDSF.
  • the specific connection between ANDSF and PCRF is: vANDSF is connected to vPCRF 1904, hANDSF is connected to hPCRF 1903, and the first ANDSF 1901 in FIG. 18 is connected to hPCRF 1903 for illustration.
  • FIG. 19 it is a schematic structural diagram of a communication device according to an embodiment of the present invention.
  • the communication device includes: an interaction unit 2002, and a processing unit 2003. Said here
  • the communication device may be an access network discovery and selection function entity ANDSF.
  • the interaction unit 2002 is configured to acquire network status information by interacting with the other access network discovery and selection function entity ANDSF after the user terminal accesses the network.
  • the processing unit 2003 is configured to send the network status information to the user terminal for target network selection, or select a target network for the user terminal according to the network status information.
  • the interaction unit 2002 interacts with the other access network discovery and selection function entity ANDSF to obtain network status information by using a newly added interface.
  • the interaction unit 2002 is configured by the home policy charging rule function entity hPCRF and The interface between the visited policy charging rule function entity vPCRF interacts with the other access network discovery and selection function entity ANDSF to obtain network status information.
  • the communication device further includes: a determination processing unit 2004.
  • the determining processing unit 2004 is configured to: after receiving the measurement report sent by the user terminal, determine that the target network cannot be selected for the user terminal, send a message to the other access network discovery and selection function entity ANDSF, requesting the The ANDSF selects a target network for the user terminal.
  • the communication device further includes: an indication unit 2005.
  • the indication unit 2005 is configured to send the policy information to the user terminal, and instruct the user terminal to report the measurement report according to the policy information.
  • the foregoing technical solution can be seen that, after the user terminal accesses the network in the technical solution of the embodiment of the present invention, the network status information is obtained through interaction between the different access network discovery and the selection function entity ANDSF, and thus the user terminal You only need to access one of the ANDSFs to pass the
  • the ANDSF obtains the network status information obtained after the information exchange on the network side, and performs corresponding processing, or obtains the target network information selected according to the interaction result after the information exchange on the network side, so that the network discovery and selection processing can be realized more simply.
  • the first ANDSF may interact with the second ANDSF to obtain network status information by using a newly added interface; or, the first ANDSF may adopt a home policy charging rule.
  • the interface between the functional entity hPCRF and the visited policy charging rule function entity vPCRF interacts with the second ANDSF to obtain network status information.
  • the technical solution of the embodiment of the present invention may be that the user terminal accesses the vANDSF of the visited place, or may be the hANDSF that accesses the attribution place.
  • the network discovery and selection method, the network system, and the communication device provided by the embodiments of the present invention are described in detail. For those skilled in the art, according to the embodiments of the present invention, in the specific implementation manner and application scope. There are variations, and the description is not to be construed as limiting the invention.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Procédé de découverte et de sélection de réseau, et système de réseau et dispositif correspondants. Ledit procédé comporte les étapes suivantes : lorsqu'un terminal d'utilisateur a accédé à un réseau, la première entité de fonction de découverte et de sélection de réseau d'accès (ANDSF) obtient des informations sur l'état du réseau en entrant en interaction avec la seconde ANDSF, et les informations d'état de réseau obtenues sont envoyées au terminal d'utilisateur par la première ANDSF afin qu'un réseau cible soit sélectionné par le terminal d'utilisateur, ou bien un réseau cible est sélectionné pour le terminal d'utilisateur en fonction des informations d'état de réseau obtenues. Selon l'invention, la solution proposée permet de simplifier le processus de découverte et de sélection de réseau.
PCT/CN2009/070741 2008-03-18 2009-03-11 Procédé de découverte et de sélection de réseau, système de réseau et dispositif de communication WO2009115015A1 (fr)

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