WO2009111929A1 - 一种用户获得家乡链路信息的方法和系统 - Google Patents

一种用户获得家乡链路信息的方法和系统 Download PDF

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Publication number
WO2009111929A1
WO2009111929A1 PCT/CN2008/071505 CN2008071505W WO2009111929A1 WO 2009111929 A1 WO2009111929 A1 WO 2009111929A1 CN 2008071505 W CN2008071505 W CN 2008071505W WO 2009111929 A1 WO2009111929 A1 WO 2009111929A1
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WIPO (PCT)
Prior art keywords
address
home
network
pco
user equipment
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PCT/CN2008/071505
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English (en)
French (fr)
Inventor
朱春晖
宗在峰
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中兴通讯股份有限公司
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Publication of WO2009111929A1 publication Critical patent/WO2009111929A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08Mobility data transfer
    • H04W8/12Mobility data transfer between location registers or mobility servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W80/00Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • the present invention relates to the field of communication technologies, and in particular, to a method and system for a user to obtain home link information.
  • Interworking Wireless Local Area Network (3GPP) Network-interactive WLAN (Wireless Local Area Network) network.
  • the purpose of the interaction is to enable WLAN access technology to work with the General Packet Radio Service (GPRS) core network infrastructure to enable WLAN users to access GPRS packet services over the WLAN access network.
  • GPRS General Packet Radio Service
  • GPRS access network consists of 3GPP radio access network (GSM EDGE Radio Access Network/UMTS Terrestrial Radio Access Network, GERAN/UTRAN), Serving GPRS Support Node (SGSN), Gateway GPRS Support Node (Gateway GPRS Support Node) , GGSN) and other supporting nodes.
  • the HLR Home Location Register
  • HSS Home Subscriber Server
  • DSMIPv6 Dual-Stack Mobile Internet Protocol version 6
  • Figure 1 is a mobility solution between an I-WLAN network and a GPRS network (I-WLAN)
  • the GGSN has the function of Home Agent (HA).
  • UE User Equipment
  • the GGSN can be considered as an Access Router (AR).
  • I-WLAN network can be accessed with Home agent function GGSN.
  • HI is the interface between the HA and the UE.
  • the UE when the UE accesses the GPRS network, the UE sends the service information that needs to be accessed to the SGSN through the 3GPP radio access network in the form of an APN (Access Point Name), and the SGSN is in the APN.
  • the DNS Server Domain Name System Server
  • the DNS server sends the IP address of the GGSN corresponding to the APN information to the SGSN.
  • the GGSN has a Home Agent (HA) function. Since most GGSNs are deployed in most cases in the existing GPRS network, not all GGSNs have HA functions.
  • HA Home Agent
  • the GGSN corresponding to the IP address obtained by the APN information does not have the HA function, which will increase the complexity of mobility management with the I-WLAN.
  • GPRS is configured as the user's home link
  • tunneling user data needs to be used between the selected independent GGSN and an HA, which will increase the complexity of data routing and increase data latency.
  • 3GPP Evolved Packet System consists of E-UTRAN (Evolved Universal Terrestrial Radio Access Network), Serving Gateway (S-GW), and Data Network Gateway (Packet) Data Network Gate Way, P-GW), MME (Mobility Management Entity), HSS and other supporting nodes.
  • the S-GW is an access gateway device connected to the E-UTRAN, and forwards data between the E-UTRAN and the P-GW, and is responsible for buffering paging waiting data
  • the P-GW is EPS and PDN (Packet Data Network) , Packet Data Network)
  • the border gateway of the network responsible for PDN access, forwarding data between EPS and PDN, etc.
  • MME is a mobility management entity responsible for user mobility management.
  • Figure 2 is an architectural diagram of allowing a non-3GPP network to access an EPS network.
  • EPS supports interworking with non-3GPP networks.
  • the P-GW acts as an anchor between 3GPP and non-3GPP networks.
  • the 3GPP organization defines the E-UTRAN access network as the home link of the UE.
  • the P-GW has the functions of AR and HA. Similar to the I-WLAN mobility management network, if the user accesses the EPS network through E-UTRAN using the terminal-based mobile IP protocol DSMIPv6, the UE needs to find the HA and discover the currently accessed E-UTRAN access network as its home chain. road.
  • a PCO Protocol Configuration Option
  • the option is used between the UE and the GGSN or the P-GW to transmit the configuration of the external protocol.
  • the network element that transmits signaling between the UE and the GGSN or the P-GW considers that the option is transparent, and they only need to forward the next network element.
  • this option has reserved bits, so some information can be added to it, and the UE, GGSN, and P-GW are also required to recognize this information.
  • the Mobile IP protocol is a network layer solution that provides mobility on the Internet, so that nodes do not interrupt ongoing communications while switching links.
  • Mobile IP provides an IP routing mechanism that allows mobile nodes to be accessed through their home address when accessing a foreign link. The following is an important term for mobile IP:
  • Mobile Node A node in a mobile IP that can be moved from the connection point of one link to another, while still being accessible through its home address.
  • HA Home Agent
  • Home Address (HA) or Home Network Prefix (HNP) A permanent IP address or IP address prefix assigned to a mobile node that belongs to the mobile node's home link.
  • the standard IP routing mechanism sends packets addressed to the mobile node's home address or home network prefix to its home link.
  • the home address can be an IPv4 (Internet Protocol version 4) address or an IPv6 address.
  • the home network prefix is an IPv6 address prefix.
  • IPv4 address is an ABCD-like format, which is 32-bit, expressed in decimal; and the IPv6 address is similar to the format of A:B:C:D:E:F:G:H, which is 128-bit, with 16 System representation; It can be seen that the IPv6 address space has been greatly expanded relative to the IPv4 address.
  • IPv6 address prefix can be used to represent the network address space. For example: 2001:251:e000::/48 indicates that the prefix is 48-bit address space, and the next 80 bits can be assigned to the host in the network. There are 2 to 80 powers.
  • IPv6 address prefix If a user obtains an IPv6 address prefix from the network, the user can use the IPv6 address prefix to generate an IPv6 address containing the address prefix as its own IPv6 address; if the IPv6 address prefix is uniquely assigned to the user, Then the user can be routed through the IPv6 address prefix, ie the data packet sent to the user can be received by the user by the IPv6 address prefix sent to the user.
  • the mobile node accesses the foreign link, it obtains from AR.
  • the obtained IP address or address prefix is the IP address or address prefix of the specific access interface obtained through the IP address allocation mechanism of the access system.
  • the subnet prefix of this IP address is the foreign subnet prefix.
  • the CoA can be an IPv4 address, an IPv6 address, or an IPv6 address prefix.
  • Home Link Refers to the network corresponding to the mobile node's home network subnet prefix.
  • Binding Refers to the association between the mobile node's home address and the care-of address.
  • the Mobile IP Protocol (DSMIPv6) is used to keep the user IP address unchanged to maintain user service continuity.
  • the GGSN or the P-GW acts as the user access router (AR) to allocate the access network address to the UE.
  • AR user access router
  • the address is used as the handover. Address (CoA).
  • the UE When the UE uses the mobility service, the UE initiates an Internet Key Exchange Version 2 (IKEv2) to establish a security association with the HA, and the HA allocates an IP address (ie, assigns HNP and/or HoA) to the UE and This address is sent to the UE.
  • IKEv2 Internet Key Exchange Version 2
  • the I-WLAN Mobility architecture configures the GPRS access network as the user's home link; in Figure 2, the EPS network can configure the EPS access network (E-UTRAN) as the user's home link.
  • E-UTRAN EPS access network
  • the UE's home address, the home agent address, and the like are statically configured in the UE, and the UE detects the router broadcast on the current IP link. If the link address prefix in the broadcast content is consistent with the prefix of the home address, it is considered to be connected.
  • Home link
  • the link layer of the UE detects the current access technology, and determines whether the current access network is a home link according to the pre-configured information, and notifies the IP layer;
  • the UE receives the current access information, and the user determines whether the current access link is a home link.
  • the technical problem to be solved by the present invention is to provide a method and system for a user to obtain home link information, which solves the problem that the information of obtaining home link in the prior art is not flexible and complicated to use.
  • the present invention proposes a method for a user to obtain home link information, including:
  • the user equipment is attached to the access network, and the access network sends the home link information to the user equipment through a protocol configuration option PCO;
  • the user equipment receives the PCO sent by the access network, and determines whether the current access network is a home link according to the home link information in the PCO.
  • the foregoing method may further have the following feature: the home link information includes an address of the home agent, and further includes: a home address and/or a home network prefix, or an indication that the access network is a home link.
  • the access network further allocates an address or an address prefix of the specific access interface to the user equipment;
  • the user equipment determines whether the current access network is a home link according to the following method: If the PCO carries an indication that the current access network is a home link, the current access network is a home link;
  • the home address carried in the PCO is the same as the address of the specific access interface, or the home network prefix is the same as the prefix part of the specific access interface address, or the home network prefix and the specific access interface If the address prefix is the same, the current access network is the home link. Otherwise, the current access network is not the home link.
  • the foregoing method may further have the following feature: when the user equipment is attached to the GPRS network of the general packet radio service, the method specifically includes:
  • the serving GPRS support node After receiving the activation packet data protocol context request, the serving GPRS support node sends a setup packet data protocol context request to the gateway GPRS support node, where the request includes the special The name of the access point;
  • the gateway GPRS support node After receiving the packet data protocol context request, the gateway GPRS support node allocates a specific access interface address or address prefix, that is, assigns a care-of address, to determine that the user equipment needs to provide home link information to the user equipment. Sending the care-of address and the PCO to the user equipment in the establishment of a packet data protocol context response message, where the PCO includes home link information.
  • the activation packet data protocol context request further includes a PCO, where the PCO carries information indicating that the user equipment supports DSMIPv6; or, carrying a request for obtaining an IP address of a home agent, Requesting the network to assign information about the home network prefix and/or requesting the network to assign home address information;
  • the establishing a packet data protocol context request includes a PCO in the activation packet data protocol context request, and after receiving the setup packet data protocol context request, the gateway GPRS support node determines, according to the specific access point name, The user equipment supports DSMIPv6, and needs to provide the home link information to the user equipment; or the gateway GPRS support node determines that the home link information needs to be provided to the user equipment according to the information carried in the PCO.
  • the foregoing method may further have the following feature: after receiving the activation packet data protocol context request sent by the user equipment, the serving GPRS support node uses the user subscription information sent from the home subscriber server or the home location register to the user equipment. After the authentication and authorization, the serving GPRS support node queries the IP address of the corresponding gateway GPRS support node through the domain name system server according to the specific access point name, and according to the IP address to the corresponding gateway. The GPRS support node sends a setup packet data protocol context request.
  • the foregoing method may further have the following features: when the user equipment is attached to the evolved packet system EPS, the method specifically includes:
  • the user equipment sends an attach request or establishes a packet data network connection request to the mobility management entity, where the request includes a PCO;
  • the mobility management entity After receiving the attach request including the PCO or establishing a packet data network connection request, the mobility management entity sends a default bearer request to the data network gateway by using the serving gateway, where the establishing default bearer request includes the attach request or PCO in a packet data network connection request;
  • the data network gateway After receiving the default bearer request, the data network gateway allocates the user equipment
  • the address or address prefix of the specific access interface is the assignment of the care-of address, and the PCO is determined to provide the home link information to the user equipment, and the care-of address and the PCO are sent to the user equipment in the establishment of the default bearer response message. , the home link information is included in the PCO.
  • the foregoing method may further have the following feature: the attach request or the PCO that establishes the packet data network connection request carries information indicating that the user equipment supports DSMIPv6, or carries a request for acquiring an IP address of the home agent, and requests the network. Assign information about the home network prefix and/or request the network to assign home address information.
  • the foregoing method may further have the following feature: after receiving the attach request, the mobility management entity authenticates the user equipment and establish a secure connection with the user equipment;
  • the mobility management entity After the authentication is passed, the mobility management entity initiates a location update request to the home subscriber server, and the home subscriber server inserts the subscriber subscription data into the mobility management entity to confirm that the location update is successful; the mobility management entity initiates a default bearer request to the serving gateway. Determining that the default bearer request includes the PCO carried in the attach request;
  • the serving gateway After receiving the establishment of the default bearer request, the serving gateway forwards the establishing default bearer request to the data network gateway.
  • the present invention also provides a system for a user to obtain home link information, including a user equipment and an access network, where:
  • the access network is configured to send the home link information to the user equipment by using a protocol configuration option PCO;
  • the user equipment is configured to receive a PCO sent by the access network, and determine, according to the home link information carried in the PCO, whether the current access network is a home link.
  • the access network is further configured to allocate, by the user equipment, an address of a specific access interface;
  • the home link information sent by the access network through the PCO includes a home agent.
  • the address also includes: a home address and/or home network prefix, or an indication that the access network is a home link;
  • the user equipment determines whether the current access network is a home link according to the home link information carried in the PCO. If the PCO carries the current access network as an indication of the home link, the current access network is the hometown. link; If the home address carried in the PCO is the same as the address of the specific access interface, or the home network prefix is the same as the prefix part of the specific access interface address, or the home network prefix and the specific access interface If the address prefix is the same, the current access network is the home link. Otherwise, the current access network is not the home link.
  • the access network is a general wireless packet service GPRS network
  • the access network further includes a serving GPRS support node and a gateway GPRS support node, where
  • the serving GPRS support node is configured to receive an activation packet data protocol context request sent by the user equipment, where the activation packet data protocol context request includes a specific access point name and a PCO, where the PCO carrying indicates that the user equipment supports DSMIPv6 Or, the information carrying the IP address of the home agent, the information requesting the network to allocate the home network prefix, and/or the information requesting the network to assign the home address; the serving GPRS support node is further configured to send the establishment to the gateway GPRS support node.
  • a packet data protocol context request includes a specific access point name of the user equipment and a PCO sent by the user equipment;
  • the gateway GPRS support node is configured to receive a setup packet data protocol context request sent by the serving GPRS support node, allocate a specific access interface address, that is, a care-of address, to the user equipment, and send a packet data protocol context response message to the user equipment,
  • the message includes a care-of address and a PCO, and the PCO includes home link information.
  • the access network is an evolved packet system, and the access network further includes a mobility management entity, a service gateway, and a data network gateway, where
  • the mobility management entity is configured to receive an attach request including a PCO sent by the user equipment, or establish a packet data network connection request, and send a default bearer request to the serving gateway, where the default bearer request carries the PCO sent by the user equipment,
  • the PCO carries information indicating that the user equipment supports DSMIPv6, or carries a request for obtaining an IP address of the home agent, requests information about the network assignment of the home network prefix, and/or requests the network to allocate the home address information;
  • the serving gateway is configured to receive a default bearer request sent by the mobility management entity, and send a default bearer request to the data network gateway, where the default bearer request carries the PCO sent by the mobility management entity;
  • the data network gateway is configured to receive a default bearer request sent by the serving gateway, and allocate, according to the PCO in the default bearer request, the address of the specific access interface, that is, the care-of address, to be forwarded by the serving gateway.
  • the address and the PCO are sent to the user equipment, and the PCO carries the home link information.
  • the UE does not need to be pre-configured or user participation is required, and the application flexibility is better.
  • the method of the present invention will speed up the discovery of the speed of the home link when the UE accesses the I-WLAN Mobility architecture using GPRS or access the EPS using E-UTRAN, and avoids the possibility of separately finding independent GGSNs and HAs.
  • Figure 1 is an architectural diagram of an I-WLAN Mobility between an I-WLAN network and a 3GPP network;
  • FIG. 2 is an architectural diagram of a non-3GPP network accessing an EPS network
  • FIG. 3 is a flow chart of a method for discovering an I-WLAN Mobility architecture according to the present invention
  • FIG. 4 is a flow chart of a method for discovering an EPS network according to the present invention
  • Figure 5 is a flow chart of a third embodiment of the method in accordance with the present invention.
  • Figure 6 is a flow chart of a fourth embodiment of the method in accordance with the present invention.
  • Figure 7 is a flow chart of a fifth embodiment of the method in accordance with the present invention. Preferred embodiment of the invention
  • the main idea of the present invention is that the access network uses the PCO to transmit the home link information to the user equipment, and the user equipment determines whether the current access network is a home link according to the home link information.
  • the user equipment is attached to the access network, and the access network sends the home link information to the user equipment through the protocol configuration option PCO; wherein the home link information includes the address of the home agent, and the method further includes: The home address and/or the home network prefix, or the access network is an indication of the home link; the access network also assigns a specific access interface address or address prefix to the user equipment, that is, assigns a care-of address; after the user equipment receives, performs The following is judged: If the PCO carries the indication that the current access network is the home link, the current access network is the home link; if the home address carried in the PCO is the same as the address of the specific access interface, or the home network prefix and If the prefix part of the address of the specific access interface is the same, or the home network pre
  • FIG. 3 is a flow chart of a method for discovering an I-WLAN Mobility architecture in accordance with the present invention:
  • the UE is attached to the GPRS network, and sends an Activate PDP (Packet Data Protocol) context request to the SGSN, where the request includes a specific APN, or a specific APN and PCO;
  • PDP Packet Data Protocol
  • the PCO carries information indicating that the UE supports DSMIPv6, or obtains a request from the home agent's IP address and requests the network to assign a home network prefix (HNP), or obtains a home agent's IP address request and requests the network to assign a home address ( HoA) information, or a request to obtain the home agent's IP address and request the network to assign home network prefix (HNP) and home address (HoA) information;
  • HNP home network prefix
  • HoA home address
  • HoA home address
  • the SGSN receives the activation PDP context request sent by the UE, and after authenticating and authorizing the user by using the user subscription information sent from the HSS or the HLR, the SGSN sends the included specific APN to the DNS server for query, and the DNS server will The IP address of the GGSN is sent to the SGSN, and the SGSN sends a PDP context request to the GGSN, where the specific APN, or the specific APN and the PCO sent by the UE are included;
  • the GGSN After the GGSN receives the PDP Context Request message, the GGSN allocates a CoA to the UE.
  • the CoA may be an IPv4 address, an IPv6 address, or an IPv6 address prefix.
  • the GGSN determines that the user equipment needs to provide the home link information from the specific APN or the PCO, and specifically includes: the GGSN can determine that the user supports the DSMIPv6 from the specific APN; and if the PCO includes the information indicating that the UE supports the DSMIPv6, the GGSN You can also know the user branch from the PCO.
  • the foregoing allocated CoA and the PCO including the home link information are sent to the UE through the SGSN, where the PCO is specifically an IP address of the HA and the current GPRS network is an indication of the home link or HoA and / or HNP.
  • HoA is the same IP address as CoA (IPv4 or IPv6 address); HNP is the same IPv6 address prefix as CoA (IPv6 address prefix), or the same IPv6 address prefix as CoA (IPv6 address) prefix;
  • the UE obtains the IP address of the HA from the PCO, and compares the PCO information with the CoA according to the PCO information to determine whether the current access network is a home link, specifically: if the current GPRS network in the PCO is a home chain The indication of the road, then the UE can judge that the current GPRS network is a home link; if the PCO contains HoA and/or HNP, the UE compares the IP address or IP address prefix with the access network address (CoA) obtained from the GGSN.
  • CoA access network address
  • HNP and CoA IPv6 address prefix
  • IPv6 address prefix part of HNP and CoA
  • IPv4 address HoA
  • IPv4 address HoA
  • IPv4 address HoA
  • IPv6 address HoA
  • IPv6 address HoA and CoA
  • FIG. 4 is a flow chart of a method for discovering an EPS network according to the present invention:
  • the UE is attached to the EPS network, and includes a PCO in the attach request; or the UE initiates a request to establish a packet data network connection, where the request includes a PCO;
  • the PCO carries information indicating that the UE supports DSMIPv6, or obtains a request from the home agent's IP address and requests the network to assign a home network prefix (HNP), or obtains a home agent's IP address request and requests the network to assign a home address ( HoA) information, or a request to obtain the home agent's IP address and request the network to assign home network prefix (HNP) and home address (HoA) information;
  • HNP home network prefix
  • HoA home address
  • HoA home address
  • the MME receives an attach request or a packet data network connection that is sent by the UE and includes a PCO. After the request is sent to the Serving GW by establishing a default bearer request, the Serving GW sends a P-GW to the P-GW to establish a default bearer request for the PCO sent by the LIE;
  • the P-GW allocates an IP address or an address prefix (CoA) to the user equipment, where the P-GW indicates that the UE supports DSMIPv6 through the PCO, or according to the request for obtaining the IP address of the home agent in the PCO.
  • the requesting network allocates information of a home network prefix (HNP) and/or a home address (HoA), and determines that the home link information needs to be provided to the user equipment, and the P-GW allocates an IP address to the UE in establishing a default bearer response message.
  • the address prefix (CoA) and the PCO containing the home link information which is specifically the IP address of the P-GW (ie, HA) and the current EPS access network is an indication of the home link or HoA and/or HNP. ;
  • HoA is the same IP address as CoA (IPv4 or IPv6 address); HNP is the same IPv6 address prefix as CoA (IPv6 address prefix), or the same IPv6 address prefix as CoA (IPv6 address) prefix;
  • the UE obtains the IP address of the home agent from the PCO, and compares the PCO information with the CoA according to the PCO information, and determines whether the current access network is a home link, specifically: if the current EPS network in the PCO is The indication of the home link, then the UE can judge that the current E-UTRAN access network is a home link; if the PCO contains HoA and/or HNP, the UE obtains the access network address (CoA) obtained from the P-GW.
  • CoA access network address
  • IPv6 address prefix HNP and CoA (IPv6 address prefix), or the prefix part of HNP and CoA (IPv6 address), or HoA (IPv4 address) and CoA (IPv4 address). Or the HoA (IPv6 address) and CoA (IPv6 address) are the same, then it can be judged that the current E-UTRAN access network is the home link.
  • Figure 5 is a flow chart of a third embodiment of the method in accordance with the present invention.
  • this embodiment describes that the UE accesses the GPRS network, the GPRS network is the home link of the UE, and the GGSN (as the AR) has the HA function; the UE is configured with a specific APN, and the specific APN has been Registered in the subscriber's subscription data in the HSS, the DNS server is also configured with IP address information of the HA-enabled GGSN corresponding to the specific APN. Description of each step: S502, the UE is attached to the GPRS network, and the HSS inserts the user subscription data including the specific APN into the SGSN, and the SGSN saves the user subscription information.
  • the UE initiates an activation PDP context request, where the UE includes a specific APN, and a PCO that includes information that the UE supports the DSMIPv6 protocol, where the PCO includes the UE supporting DSMIPv6 information, or the UE requests to obtain the IP address of the home agent and request the network to allocate the hometown.
  • the SGSN After receiving the foregoing request, the SGSN performs authentication and authorization according to the user subscription information obtained from the HSS/HLR. If the specific APN passes the authentication and authorization, the SGSN sends the specific APN to the DNS server, and the DNS server finds the pair. The IP address of the GGSN of the specific A-PN should be sent to the SGSN; the context request, the request message includes a specific APN, and the PCO sent by the UE;
  • the GGSN After receiving the foregoing message, the GGSN allocates an IPv4 address and/or an IPv6 address prefix (ie, CoA) to the UE.
  • the GGSN may determine from the specific APN or know from the PCO that the UE supports DSMIPv6, or the GGSN knows from the PCO sent by the UE forwarded by the SGSN that the UE requests the GGSN to notify the HA of the IP address and allocates HNP and/or HoA to the UE.
  • the GGSN determines that it is necessary to provide the home link information to the user equipment according to the above information and the HA function. Therefore, in the PDP context response message, the CoA and the PCO information are sent to the SGSN, where the PCO includes
  • the IP address of the HA and the current GPRS access network are indications of the home link or HoA and/or HNP.
  • the information that may be included in the PCO is as follows:
  • the IP address of the HA and the current GPRS access network are indications of the home link, or the IP address of the HA and the HoA, or the IP address of the HA and the HNP, or the IP address of the HA and the HoA And HNP;
  • HoA is the same IP address as the CoA (IPv4 or IPv6 address); HNP is the same IPv6 address prefix as the CoA (IPv6 address prefix), or the same IPv6 address prefix as the CoA (IPv6 address) prefix; S512.
  • the SGSN After receiving the foregoing message, the SGSN sends the CoA and PCO information received from the GGSN to the UE by activating the PDP context accept message.
  • the UE will obtain the home link information from the PCO, including: the IP address of the HA; if the PCO contains the indication that the current GPRS network is the home link, the UE can determine that the current GPRS network is the home link; if the PCO contains the HoA And / or HNP, the UE compares the IP address or IP address prefix with the access network address (CoA) obtained from the GGSN, as long as it is judged that there is a pair (ie HNP and CoA (IPv6 address prefix), or HNP and CoA ( The prefix part of the IPv6 address, or HoA (IPv4 address) and CoA (IPv4 address), or HoA (IPv6 address) and CoA (IPv6 address) are the same, then the UE can judge the current GPRS access network as the home chain. road.
  • Figure 6 is a flow chart of a fourth embodiment of the method in accordance with the present invention.
  • the embodiment describes that the UE accesses the E-UTRAN network, the E-UTRAN network is the home link of the UE, and the P-GW has the functions of the AR and the HA.
  • the steps are as follows:
  • the UE accesses the E-UTRAN, and the UE sends an attach request to the MME, where the request includes a PCO, where the PCO includes the UE supporting DSMIPv6 information, or the UE requests to obtain the IP address of the home agent and request the network to allocate the home network prefix (HNP) Information, or the UE requests the IP address of the home agent and requests the network to assign the home address (HoA) information, or the UE requests the IP address of the home agent and requests the network to assign the home network prefix (HNP) and hometown. Address (HoA) information;
  • HoA home address
  • the MME authenticates the user and establishes a secure connection with the UE. If the MME does not have the information of the user in the authentication process, the MME needs to interact with the HSS to authenticate the user.
  • the MME initiates a location update request to the HSS, and the HSS inserts the user subscription data into the MME, and confirms that the location update is successful.
  • the MME initiates a default bearer request to the S-GW, where the request includes a PCO sent by the UE; after receiving the request, the S-GW forwards the PCO to the P-GW;
  • the P-GW After receiving the foregoing message, the P-GW allocates an IPv4 address and/or an IPv6 address prefix to the UE, where the IPv4 address or the IPv6 address prefix is the CoA of the UE.
  • the P-GW learns the UE from the PCO Support DSMIPv6, or the UE requests to obtain the IP address of the home agent and request the network to allocate the home network prefix (HNP) and/or the home address (HoA).
  • HNP home network prefix
  • HoA home address
  • the P-GW determines that the user needs to be based on the above information and also has the HA function.
  • the device provides the home link information.
  • the P-GW sends the CoA and the PCO to the S-GW, where the PCO includes the IP address of the P-GW and the current E-UTRAN access.
  • the network is an indication of the home link or HoA and/or HNP (with a CoA-like IP address or address prefix) that the S-GW forwards to the MME.
  • the PCO contains information that may be possible:
  • the IP address of the P-GW and the current E-UTRAN access network are indications of the home link, or the IP address of the P-GW and the HoA, or the IP address of the P-GW and the HNP. , or the IP address of the P-GW and HoA and HNP;
  • HoA is the same IP address as CoA (IPv4 or IPv6 address); HNP is the same IPv6 address prefix as CoA (IPv6 address prefix), or the same IPv6 address prefix as CoA (IPv6 address) prefix;
  • the MME sends an attach accept message to the UE by using a radio access network, where the message includes a PCO.
  • the radio access network notifies the UE of the PCO by using a radio resource control connection reconfiguration message.
  • the UE obtains the information of the home link from the PCO, including: the IP address of the HA; if the PCO contains the indication that the current E-UTRAN access network is the home link, the UE can determine that the current network is the home link;
  • the PCO contains HoA and/or HNP, and the UE compares the IP address or the address prefix with the access network address (CoA) obtained from the P-GW, as long as it is determined that there is a pair (ie, HNP and CoA (IPv6 address prefix), Or the prefix part of HNP and CoA (IPv6 address), or HoA (IPv4 address) and CoA (IPv4 address), or HoA (IPv6 address) and CoA (IPv6 address) are the same, then the
  • the initial attach is completed, and a default bearer is established between the UE and the P-GW.
  • Figure 7 is a flow chart of a fifth embodiment of the method in accordance with the present invention.
  • this embodiment describes that a UE accesses an E-UTRAN network, and the UE initiates a PDN connection request.
  • the E-UTRAN network is the home link of the UE, and the P-GW has the AR and HA functions. Yes, the steps are described as follows:
  • the UE sends a PDN network connection request to the MME, where the request includes a PCO.
  • the PCO includes: the UE supports DSMIPv6 information, or the UE requests to obtain the home agent's IP address and request the network to allocate the home network prefix (HNP) information, or the UE requests the home agent's IP address request and requests the network to allocate the home address.
  • HNP home network prefix
  • HoA home network prefix
  • I-- ⁇ home address
  • the MME initiates a default bearer request to the S-GW, where the request includes a PCO sent by the UE; after receiving the request, the S-GW forwards the PCO to the P-GW;
  • the P-GW After receiving the foregoing message, the P-GW allocates an IPv4 address and/or an IPv6 address prefix to the UE, where the IPv4 address and/or the IPv6 address prefix is a CoA of the UE.
  • the P-GW learns from the PCO that the UE supports DSMIPv6, or the UE requests to obtain the IP address of the home agent and requests the network to allocate the home network prefix (HNP) and/or the home address (HoA), and the P-GW according to the above information and itself
  • the HA function is used to determine that the home link information needs to be provided to the user equipment.
  • the P-GW sends the CoA and the PCO to the S-GW, and the PCO includes the P-GW.
  • the IP address and the current E-UTRAN access network are indications of the home link or HoA and/or HNP (with a CoA-like IP address or address prefix), and the S-GW forwards the above information to the MME.
  • the PCO contains information that may be possible:
  • the IP address of the P-GW and the current E-UTRAN access network are indications of the home link, or the IP address of the P-GW and the HoA, or the IP address of the P-GW and the HNP. , or the IP address of the P-GW and HoA and HNP;
  • HoA is the same IP address as CoA (IPv4 or IPv6 address); HNP is the same IPv6 address prefix as CoA (IPv6 address prefix), or the same IPv6 address prefix as CoA (IPv6 address) prefix;
  • the MME sends a connection request accept message to the UE by using a radio access network, where the message includes a PCO.
  • the connection accept message includes a bearer setup response sent to the radio access network and a radio resource control connection reconfiguration message sent by the radio access network to the UE.
  • the UE obtains the information of the home link from the PCO, including: the IP address of the HA; if the PCO contains the indication that the current E-UTRAN access network is the home link, the UE can determine that the current network is the home link; PCO Containing HoA and/or HNP, the UE compares the IP address or address prefix with the access network address (CoA) obtained from the P-GW, as long as it is determined that there is a pair (ie, HNP and CoA (IPv6 address prefix), or The prefix part of HNP and CoA (IPv6 address), or HoA (IPv4 address) and CoA (IPv4 address), or HoA (IPv6 address) and CoA (IPv6 address) are the same, then the UE can judge the current E-UTRAN.
  • the access network is a home link.
  • the present invention also provides a system for a user to obtain home link information, including a user equipment and an access network, where:
  • the access network is configured to send the home link information to the user equipment by using a protocol configuration option PCO, where the home link information sent by the access network includes an address of the home agent, and further includes: a home address and/or The home network prefix HNP, or the access network is an indication of the home link;
  • the user equipment is configured to receive a PCO sent by the access network, and determine, according to the home link information carried in the PCO, whether the current access network is a home link:
  • the PCO carries an indication that the current access network is a home link, the current access network is a home link;
  • the home address carried in the PCO is the same as the address of the specific access interface, or the home network prefix is the same as the prefix part of the address of the specific access interface, or the home network prefix and the specific access interface If the address prefix is the same, the current access network is the home link. Otherwise, the current access network is not the home link.
  • the method of the present invention does not require pre-configuration of the UE and does not require user participation, and has better application flexibility. ⁇ This method will speed up the use of GPRS to access the I-WLAN Mobility architecture or use E-UTRAN to access EPS when discovering the speed of the home link, avoiding the possibility of finding separate GGSNs and HAs respectively.
  • the UE does not need to be pre-configured or user participation is required, and the application flexibility is better. ⁇ This method will speed up the discovery of the speed of the home link when the UE accesses the I-WLAN Mobility architecture using GPRS or access the EPS using E-UTRAN, and avoids the possibility of separately finding independent GGSNs and HAs.

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Description

一种用户获得家乡链路信息的方法和系统
技术领域
本发明涉及通信技术领域, 更具体地, 涉及一种用户获得家乡链路信息 的方法和系统。
背景技术
交互的无线局域网络 ( Interworking Wireless Local Area Network , 3GPP ) 网络交互的 WLAN (无线局域网) 网络。 交互的目的是使 WLAN接 入技术能够与通用分组无线业务( General Packet Radio Service, GPRS )核心 网基础设施合作, 以使 WLAN用户能够通过 WLAN接入网络接入 GPRS分 组服务。
GPRS 接入网络由 3GPP 无线接入网络 (GSM EDGE Radio Access Network/UMTS Terrestrial Radio Access Network, GERAN/UTRAN ) 、 服务 GPRS支持节点 ( Serving GPRS Support Node, SGSN ) 、 网关 GPRS支持节 点 ( Gateway GPRS Support Node, GGSN )及其他支撑节点构成。 HLR ( Home Location Register, 归属位置哥存器)或 HSS ( Home Subscriber Server, 归属 用户服务器)用来保存用户签约信息。
移动用户具有 I-WLAN和 GPRS接入网络接入能力时, 在两种接入网络 之间切换时需要保持业务连续性。 3GPP标准组织已经决定釆用双栈移动因特 网协议第六版 (Dual-Stack Mobile Internet Protocol version 6 , DSMIPv6)作为保 持这种业务连续性的技术解决方案。 这个技术解决方案可以使得移动用户在 I-WLAN和 GPRS接入网络之间切换后 IP地址保持不变, 以实现业务连续。
图 1 是 I-WLAN 网络与 GPRS 网络之间移动性解决方案 ( I-WLAN
Mobility )的架构图。 其中 GGSN具有家乡代理(Home Agent, HA )的功能。 用户设备( User Equipment, UE )可以接入 I-WLAN网络与 GPRS网络。 GGSN 可以认为是接入路由器( Access Router, AR ) 。 I-WLAN网络可以接入具有 家乡代理功能的 GGSN。 HI是 HA和 UE之间的接口。
现有技术中在 UE接入 GPRS网络时, UE会将需要接入的业务信息通过 3GPP无线接入网络以 APN (接入点名称, Access Point Name ) 的形式发给 SGSN, SGSN在对该 APN信息进行签约认证与授权之后发给 DNS Server ( Domain Name System Server, 域名系统服务器)进行域名解析, DNS服务 器将该 APN信息对应的 GGSN的 IP地址发给 SGSN。 在图 1 的 I-WLAN Mobility系统中 GGSN具有家乡代理(HA )功能, 由于在现有 GPRS网络中 大多数情况下部署有多个 GGSN, 并不是所有的 GGSN都具有 HA的功能, 如果通过解析 APN信息得到的 IP地址对应的 GGSN不具有 HA功能, 将会 增加与 I-WLAN之间移动性管理的复杂性。 例如当 GPRS配置为用户的家乡 链路的时候, 需要在被选择的独立的 GGSN和一个 HA之间使用隧道传输用 户数据, 这将加大数据路由的复杂性, 增大数据延时。
3GPP 演进的分组系统 (Evolved Packet System, EPS ) 由 E-UTRAN ( Evolved Universal Terrestrial Radio Access Network , 演进的全球移动无线接 入网) 、 服务网关 (Serving Gateway, S-GW ) 、 数据网络网关 (Packet Data Network Gate Way, P-GW), MME ( Mobility Management Entity, 移动性管理 实体)、 HSS及其他支撑节点组成。 S-GW是与 E-UTRAN相连的接入网关设 备, 在 E-UTRAN和 P-GW之间转发数据, 并且负责对寻呼等待数据进行緩 存; P-GW则是 EPS与 PDN (分组数据网络, Packet Data Network ) 网络的 边界网关, 负责 PDN的接入、 在 EPS与 PDN间转发数据等功能; MME是 移动性管理实体, 负责用户的移动性管理。
图 2是允许非 3GPP网络接入 EPS网络的架构图。
如图 2所示, EPS支持与非 3GPP网络的互通。 P-GW作为 3GPP与非 3GPP 网络间的锚点。 3GPP组织定义 E-UTRAN接入网络为 UE的家乡链路。 P-GW 具有 AR和 HA的功能。 与 I-WLAN移动性管理网络类似的, 如果用户使用 基于终端的移动 IP协议 DSMIPv6通过 E-UTRAN接入 EPS网络, UE需要找 到 HA以及发现当前接入的 E-UTRAN接入网络为其家乡链路。
在 GPRS和 EPS网络中定义了 PCO ( Protocol Configuration Option, 协议 配置选项), UE和 GGSN或 P-GW之间用该选项来传输外部协议配置情况, 在 UE和 GGSN或 P-GW之间传输信令的网元认为该选项是透明的, 它们只 需要转发下一个网元即可。 目前该选项有保留位, 因此可以向其中增加一些 信息, 此外还需要 UE、 GGSN和 P-GW能够识别这些信息。
移动 IP协议是一种在因特网 (Internet )上提供移动功能的网络层方案, 使节点在切换链路时不中断正在进行的通信。 特别是移动 IP提供了一种 IP 路由机制,使得在移动节点接入外地链路时仍然可以通过其家乡地址被访问。 以下将解释关于移动 IP的重要专有名词:
移动节点 (Mobile Node): 指移动 IP中能够从一个链路的连接点移动到另 一个连接点, 同时, 仍能通过其家乡地址被访问的节点。
家乡代理 (Home Agent, HA): 指移动节点家乡链路上的一个路由器。 当 移动节点离开家乡链路时, 能截取其家乡链路上的目的地址为移动节点家乡 地址的数据包, 通过隧道转发到移动节点注册的转交地址。
家乡地址 (Home Address, HoA)或家乡网络前缀(HNP, Home Network Prefix ) : 指分配给移动节点的永久的 IP地址或 IP地址前缀, 属于移动节点 的家乡链路。 标准的 IP路由机制会把发给移动节点家乡地址或家乡网络前缀 的分组发送到其家乡链路。 家乡地址可以是 IPv4 ( Internet Protocol version 4, 因特网协议第四版 )地址或者 IPv6地址。 家乡网络前缀是 IPv6地址前缀。
下面对 IPv4地址, IPv6地址与 IPv6地址前缀进行说明。 IPv4地址是类 似 A.B.C.D 的格式, 它是 32 位, 用 10 进制表示; 而 IPv6 地址类似 A:B:C:D:E:F:G:H的格式, 它是 128位的, 用 16进制表示; 可见, IPv6地址 空间相对于 IPv4地址有了极大的扩充。 IPv6地址前缀可以用来表示网络地址 空间, 比如: 2001:251:e000::/48表示前缀为 48位的地址空间, 其后的 80位 可分配给网络中的主机, 共有 2的 80次方个地址; 如果一个用户从网络获得 一个 IPv6地址前缀,那么该用户可以使用该 IPv6地址前缀生成一个包含该地 址前缀的 IPv6地址作为自己的 IPv6地址; 如果 IPv6地址前缀被唯一地分配 给用户使用, 那么该用户可以通过该 IPv6地址前缀被寻址路由, 即发给该用 户的数据包可以通过发给该用户的 IPv6地址前缀而被该用户接收到。
转交地址 (Care of Address, CoA): 指移动节点访问外地链路时从 AR获 得的 IP地址或地址前缀, 是通过接入系统的 IP地址分配机制获得的特定的 接入接口的 IP地址或地址前缀。 这个 IP地址的子网前缀是外地子网前缀。 该 CoA可以是 IPv4地址, IPv6地址或者 IPv6地址前缀。
家乡链路 (Home Link): 指对应于移动节点家乡子网前缀的网络。
外地链路 (Foreign Link): 指除了其家乡链路之外的任何链路。
绑定 (Binding): 指移动节点家乡地址和转交地址之间的关联。
当 UE作为移动节点接入 I-WLAN Mobility网络或 EPS网络时, 移动 IP 协议(DSMIPv6 )被用来保持用户 IP地址不变, 以维持用户业务连续性。 在 UE接入 I-WLAN Mobility网络或 EPS网络时, GGSN或 P-GW作为用户接入 路由器(AR )会为 UE分配接入网地址, 当用户使用移动性业务时, 该地址 将做为转交地址(CoA ) 。 当 UE使用移动性业务时, UE发起因特网密钥交 换第 2版( Internet Key Exchange version 2, IKEv2 )与 HA建立安全联盟, HA会为 UE分配 IP地址(即分配 HNP和 /或 HoA )并把该地址发给 UE。
当 UE接入家乡链路时不使用移动 IP协议, 不在 HA将家乡地址和转交 地址绑定。在图 1中, I-WLAN Mobility架构配置 GPRS接入网络为用户的家 乡链路; 在图 2中, EPS网络可以配置 EPS接入网络( E-UTRAN )为用户的 家乡链路。 当用户接入上述配置的家乡链路时, 现有技术中有三种方法可以 使得用户发现当前接入的链路是家乡链路:
方法一, 将 UE的家乡地址, 家乡代理地址等信息静态配置在 UE中, UE检测当前 IP链路上的路由器广播, 如果广播内容中的链路地址前缀与其 家乡地址的前缀一致, 即认为接入家乡链路;
方法二, UE的链路层检测当前的接入技术,根据预先配置的信息决定当 前的接入网络是否是家乡链路, 并通知 IP层;
方法三, UE收到当前的接入信息, 由用户决定当前的接入链路是否是家 乡链路。
上述方法一和二需要在 UE 中配置相应信息, 降低了使用的灵活性; 上 述方法三需要用户参与, 增加了使用的复杂度, 影响用户体验。 发明内容
本发明要解决的技术问题是提供一种用户获得家乡链路信息的方法和系 统, 解决现有技术中获取家乡链路信息不够灵活, 使用复杂的问题。
为了解决上述技术问题, 本发明提出了一种用户获得家乡链路信息的方 法, 包含:
用户设备附着到接入网络,接入网络通过协议配置选项 PCO携带家乡链 路信息发送给所述用户设备;
所述用户设备接收接入网络发送的 PCO,根据 PCO中的所述家乡链路信 息判断当前接入网络是否为家乡链路。
进一步的, 上述方法还可具有以下特点, 所述家乡链路信息包含家乡代 理的地址, 还包含: 家乡地址和 /或家乡网络前缀, 或接入网络为家乡链路的 指示。
进一步的, 上述方法还可具有以下特点, 所述接入网络还为所述用户设 备分配特定的接入接口的地址或地址前缀;
所述用户设备根据如下方法判断当前接入网络是否为家乡链路: 如果所述 PCO中携带当前接入网络为家乡链路的指示,则当前接入网络 为家乡链路;
如果所述 PCO中携带的家乡地址与所述特定的接入接口的地址相同,或 家乡网络前缀与所述特定接入接口地址的前缀部分为相同, 或家乡网络前缀 与所述特定接入接口的地址前缀相同, 则当前接入网络为家乡链路, 否则, 当前接入网络不是家乡链路。
进一步的, 上述方法还可具有以下特点, 所述用户设备附着到通用分组 无线业务 GPRS网络时, 具体包含:
所述用户设备发送激活分组数据协议上下文请求至服务 GPRS 支持节 点, 所述请求中携带特定的接入点名称;
所述服务 GPRS支持节点收到所述激活分组数据协议上下文请求后, 向 网关 GPRS支持节点发送建立分组数据协议上下文请求, 请求中包含所述特 定的接入点名称;
所述网关 GPRS支持节点收到该建立分组数据协议上下文请求后, 为所 述用户设备分配特定的接入接口的地址或地址前缀即分配转交地址, 判断需 要向所述用户设备提供家乡链路信息, 在建立分组数据协议上下文响应消息 中将所述转交地址和 PCO发送给用户设备, 所述 PCO中包含家乡链路信息。
进一步的, 上述方法还可具有以下特点, 所述激活分组数据协议上下文 请求中还包含 PCO,所述 PCO携带表明所述用户设备支持 DSMIPv6的信息; 或者, 携带获得家乡代理的 IP地址的请求, 请求网络分配家乡网络前缀的信 息和 /或请求网络分配家乡地址的信息;
所述建立分组数据协议上下文请求中包含该激活分组数据协议上下文请 求中的 PCO, 所述网关 GPRS支持节点收到该建立分组数据协议上下文请求 后, 根据所述特定的接入点名称判断所述用户设备支持 DSMIPv6, 需要向所 述用户设备提供家乡链路信息; 或所述网关 GPRS支持节点根据所述 PCO中 携带的信息判断需要向所述用户设备提供家乡链路信息。
进一步的, 上述方法还可具有以下特点, 所述服务 GPRS支持节点收到 用户设备发来的激活分组数据协议上下文请求后, 使用从归属用户服务器或 归属位置寄存器发来的用户签约信息对用户设备进行认证和授权; 通过认证 和授权后, 所述服务 GPRS支持节点根据所述特定的接入点名称通过域名系 统服务器查询对应的网关 GPRS支持节点的 IP地址, 根据所述 IP地址向对 应的网关 GPRS支持节点发送建立分组数据协议上下文请求。
进一步的, 上述方法还可具有以下特点, 所述用户设备附着到演进的分 组系统 EPS时, 具体包含:
所述用户设备发送附着请求或者建立分组数据网络连接请求至移动性管 理实体, 所述请求中包含 PCO;
所述移动性管理实体收到所述包含 PCO 的附着请求或建立分组数据网 络连接请求后, 通过服务网关发送建立默认承载请求至数据网络网关, 所述 建立默认承载请求中包含所述附着请求或分组数据网络连接请求中的 PCO;
所述数据网络网关收到所述建立默认承载请求后, 为所述用户设备分配 特定的接入接口的地址或地址前缀即分配转交地址,根据所述 PCO判断需要 向所述用户设备提供家乡链路信息, 在建立默认承载响应消息中将所述转交 地址和 PCO发送给用户设备, 在该 PCO中包含家乡链路信息。
进一步的, 上述方法还可具有以下特点, 所述附着请求或者建立分组数 据网络连接请求的 PCO中携带指示所述用户设备支持 DSMIPv6的信息, 或 者, 携带获取家乡代理的 IP地址的请求, 请求网络分配家乡网络前缀的信息 和 /或请求网络分配家乡地址的信息。
进一步的, 上述方法还可具有以下特点, 所述移动性管理实体收到所述 附着请求后, 对所述用户设备进行鉴权, 与用户设备建立安全连接;
鉴权通过后, 移动性管理实体向归属用户服务器发起位置更新请求, 归 属用户服务器将用户签约数据插入移动性管理实体, 确认位置更新成功; 移动性管理实体向服务网关发起建立默认承载请求, 所述建立默认承载 请求中包含所述附着请求中携带的 PCO;
服务网关收到所述建立默认承载请求后, 转发所述建立默认承载请求至 数据网络网关。
本发明还提出一种用户获得家乡链路信息的系统, 包含用户设备、 接入 网络, 其中:
所述接入网络,用于通过协议配置选项 PCO携带家乡链路信息发送给所 述用户设备;
所述用户设备,用于接收接入网络发送的 PCO,根据 PCO中携带的家乡 链路信息判断当前接入网络是否为家乡链路。
进一步的, 上述系统还可具有以下特点, 所述接入网络还用于为所述用 户设备分配特定的接入接口的地址; 所述接入网络通过 PCO发送的家乡链路 信息包含家乡代理的地址, 还包含: 家乡地址和 /或家乡网络前缀, 或接入网 络为家乡链路的指示;
所述用户设备根据 PCO 中携带的家乡链路信息判断当前接入网络是否 为家乡链路是指: 如果所述 PCO中携带当前接入网络为家乡链路的指示, 则 当前接入网络为家乡链路; 如果所述 PCO中携带的家乡地址与所述特定的接入接口的地址相同,或 家乡网络前缀与所述特定接入接口地址的前缀部分为相同, 或家乡网络前缀 与所述特定接入接口的地址前缀相同, 则当前接入网络为家乡链路, 否则, 当前接入网络不是家乡链路。
进一步的, 上述系统还可具有以下特点, 所述接入网络为通用无线分组 业务 GPRS网络,所述接入网络进一步包括服务 GPRS支持节点和网关 GPRS 支持节点, 其中,
所述服务 GPRS支持节点, 用于接收用户设备发送的激活分组数据协议 上下文请求, 该激活分组数据协议上下文请求中包含特定的接入点名称和 PCO, 所述 PCO携带表明所述用户设备支持 DSMIPv6的信息, 或者, 携带 获得家乡代理的 IP地址的请求、请求网络分配家乡网络前缀的信息和 /或请求 网络分配家乡地址的信息; 所述服务 GPRS支持节点还用于向网关 GPRS支 持节点发送建立分组数据协议上下文请求; 该建立分组数据协议上下文请求 中包含所述用户设备的特定的接入点名称和所述用户设备发送的 PCO;
所述网关 GPRS支持节点, 用于接收服务 GPRS支持节点发送的建立分 组数据协议上下文请求,为用户设备分配特定的接入接口的地址即转交地址, 发送建立分组数据协议上下文响应消息至用户设备, 所述消息中包含转交地 址和 PCO, 该 PCO中包含家乡链路信息。
进一步的, 上述系统还可具有以下特点, 所述接入网络为演进的分组系 统, 所述接入网络进一步包括移动性管理实体、 服务网关和数据网络网关, 其中,
所述移动性管理实体,用于接收用户设备发送的包含 PCO的附着请求或 建立分组数据网络连接请求, 向服务网关发送建立默认承载请求, 所述建立 默认承载请求中携带用户设备发送的 PCO,该 PCO中携带指示所述用户设备 支持 DSMIPv6的信息, 或者, 携带获取家乡代理的 IP地址的请求、 请求网 络分配家乡网络前缀的信息和 /或请求网络分配家乡地址的信息;
所述服务网关, 用于接收移动性管理实体发送的建立默认承载请求, 发 送建立默认承载请求至数据网络网关, 所述建立默认承载请求中携带移动性 管理实体发送的 PCO; 所述数据网络网关, 用于接收服务网关发送的建立默认承载请求, 根据 该建立默认承载请求中的 PCO, 为所述用户设备分配特定的接入接口的地址 即转交地址, 通过服务网关将转交地址和 PCO发送给用户设备, 该 PCO中 携带家乡链路信息。
釆用本发明的方法, 不需要对 UE进行预先配置也不需要用户参与, 具 有较好的应用灵活性。 釆用本发明方法将加快 UE使用 GPRS接入 I-WLAN Mobility架构或使用 E-UTRAN接入 EPS时发现家乡链路的速度, 避免了可 能发生的分别找到独立的 GGSN与 HA的情况。
附图概述
图 1 是 I-WLAN 网络与 3GPP 网络之间移动性解决方案 ( I-WLAN Mobility ) 的架构图;
图 2是非 3GPP网络接入 EPS网络的架构图;
图 3是根据本发明在 I-WLAN Mobility架构的发现方法流程图; 图 4是根据本发明在 EPS网络的发现方法流程图;
图 5是根据本发明方法的第三实施例的流程图;
图 6是根据本发明方法的第四实施例的流程图;
图 7是根据本发明方法的第五实施例的流程图。 本发明的较佳实施方式
以下结合附图对本发明的优选实施例进行说明, 应当理解, 此处所描述 的优选实施例仅用于说明和解释本发明, 并不用于限定本发明。
本发明的主要思想是接入网络利用 PCO 来传递家乡链路信息给用户设 备, 用户设备根据家乡链路信息判断当前接入网络是否是家乡链路。 具体包 含, 用户设备附着到接入网络, 接入网络通过协议配置选项 PCO携带家乡链 路信息发送给用户设备; 其中家乡链路信息中包含家乡代理的地址, 还包含: 家乡地址和 /或家乡网络前缀, 或接入网络为家乡链路的指示; 接入网络还为 用户设备分配特定的接入接口的地址或地址前缀即分配转交地址; 用户设备 收到后, 进行如下判断: 如果 PCO中携带当前接入网络为家乡链路的指示, 则当前接入网络为家乡链路;如果 PCO中携带的家乡地址与特定的接入接口 的地址相同, 或家乡网络前缀与所述特定接入接口的地址的前缀部分相同, 或家乡网络前缀与所述特定接入接口的地址前缀相同, 则当前接入网络为家 乡链路, 否则, 当前接入网络不是家乡链路。
第一实施例:
图 3是根据本发明在 I-WLAN Mobility架构的发现方法流程图:
S302, UE附着到 GPRS网络, 发送激活 PDP ( Packet Data Protocol, 分 组数据协议)上下文请求至 SGSN, 该请求中包含特定的 APN, 或者特定的 APN和 PCO;
该 PCO中携带表明该 UE支持 DSMIPv6的信息, 或者获得家乡代理的 IP地址的请求和请求网络分配家乡网络前缀(HNP ) 的信息, 或者获得家乡 代理的 IP地址的请求和请求网络分配家乡地址(HoA )的信息, 或者获得家 乡代理的 IP地址的请求以及请求网络分配家乡网络前缀( HNP )和家乡地址 ( HoA ) 的信息;
S304, SGSN收到 UE发来的激活 PDP上下文请求, 在使用从 HSS或 HLR发来的用户签约信息对该用户进行认证和授权后,将包含的特定的 APN 发给 DNS服务器查询, DNS服务器将查询得到的 GGSN的 IP地址发给 SGSN, SGSN向该 GGSN发送建立 PDP上下文请求, 其中包含特定的 APN, 或者特 定的 APN和 UE发来的 PCO;
S306 , GGSN收到建立 PDP上下文请求消息后, GGSN为该 UE分配 CoA, 该 CoA可以是 IPv4地址, 或者 IPv6地址, 或者 IPv6地址前缀。 GGSN从特 定的 APN或 PCO判断需要向所述用户设备提供家乡链路信息, 具体包含: GGSN从特定的 APN可以判断出该用户支持 DSMIPv6; 如果 PCO中包含表 明该 UE支持 DSMIPv6的信息, 那么 GGSN也可以从 PCO中得知该用户支 持 DSMIPv6; 或者根据 PCO中的获得家乡代理的 IP地址的请求和请求网络 分配家乡网络前缀(HNP )和 /或家乡地址(HoA ) 的信息, 从而判断出需要 向所述用户设备 ·提供家乡链路信息, 在建立 PDP上下文响应消息中将上述分 配的 CoA以及包含家乡链路信息的 PCO通过 SGSN发送给 UE, 该 PCO具 体为 HA的 IP地址和当前 GPRS网络是家乡链路的指示或者 HoA和 /或 HNP。
HoA是与 CoA( IPv4或 IPv6地址)一样的 IP地址; HNP是与 CoA ( IPv6 地址前缀)一样的 IPv6地址前缀,或者与 CoA( IPv6地址)的前缀一样的 IPv6 地址前缀;
S308, UE从 PCO中获得其 HA的 IP地址,根据 PCO信息,或根据 PCO 信息和 CoA进行比较,判断当前接入网络是否是家乡链路,具体为:如果 PCO 中含有当前 GPRS网络是家乡链路的指示, 那么 UE就可以判断当前 GPRS 网络是家乡链路; 如果 PCO中含有 HoA和 /或 HNP, UE将其与从 GGSN获 得的接入网地址( CoA )比较 IP地址或 IP地址前缀, 只要判断出其中有一对 (即 HNP和 CoA ( IPv6地址前缀 ) , 或者 HNP和 CoA ( IPv6地址 )的前缀 部分, 或者 HoA ( IPv4地址 )和 CoA ( IPv4地址 ) , 或者 HoA ( IPv6地址 ) 和 CoA ( IPv6地址) )是相同的, 那么 UE就可以判断当前 GPRS接入网络 为家乡链路。
第二实施例:
图 4是根据本发明在 EPS网络的发现方法流程图:
S402, UE附着到 EPS网络, 在附着请求中包含 PCO; 或者 UE发起建 立分组数据网络连接请求, 在该请求中包含 PCO;
该 PCO中携带表明该 UE支持 DSMIPv6的信息, 或者获得家乡代理的 IP地址的请求和请求网络分配家乡网络前缀(HNP ) 的信息, 或者获得家乡 代理的 IP地址的请求和请求网络分配家乡地址 ( HoA )的信息, 或者获得家 乡代理的 IP地址的请求以及请求网络分配家乡网络前缀( HNP )和家乡地址 ( HoA ) 的信息;
S404 , MME收到 UE发来的包含 PCO的附着请求或分组数据网络连接 请求后 , 通过建立默认承载请求将其发给 Serving GW, Serving GW向 P-GW 发送包含 LIE发来的 PCO的建立默认承载请求;
S406, P-GW为所述用户设备分配 IP地址或地址前缀(CoA ) , P-GW 通过 PCO中携带的表明该 UE支持 DSMIPv6的信息, 或者根据 PCO中的获 得家乡代理的 IP地址的请求和请求网络分配家乡网络前缀( HNP )和 /或家乡 地址(HoA )的信息, 判断需要向所述用户设备提供家乡链路信息, P-GW在 建立默认承载响应消息中将分配给 UE的 IP地址或地址前缀(CoA ) 以及包 含家乡链路信息的 PCO发送给 UE, 该 PCO具体为 P-GW (即 HA ) 的 IP地 址和当前 EPS接入网络是家乡链路的指示或者 HoA和 /或 HNP;
HoA是与 CoA ( IPv4或 IPv6地址)一样的 IP地址; HNP是与 CoA ( IPv6 地址前缀)一样的 IPv6地址前缀,或者与 CoA( IPv6地址)的前缀一样的 IPv6 地址前缀;
S408, UE将从 PCO中获得其家乡代理的 IP地址, 根据 PCO信息, 或 根据 PCO信息和 CoA进行比较, 判断当前接入网络是否是家乡链路, 具体 为: 如果 PCO中含有当前 EPS网络是家乡链路的指示, 那么 UE就可以判断 当前 E-UTRAN接入网络是家乡链路; 如果 PCO中含有 HoA和 /或 HNP , UE 将其与从 P-GW获得的接入网地址( CoA )比较 IP地址或 IP地址前缀, 只要 判断出其中有一对(即 HNP和 CoA( IPv6地址前缀 ) ,或者 HNP和 CoA( IPv6 地址 )的前缀部分, 或者 HoA ( IPv4地址 )和 CoA ( IPv4地址 ) , 或者 HoA ( IPv6地址 )和 CoA ( IPv6地址))是相同的,那么就可以判断当前 E-UTRAN 接入网络为家乡链路。
图 5是根据本发明方法的第三实施例的流程图。
如图 5所示, 本实施例描述的是 UE接入 GPRS网络, GPRS网络是 UE 的家乡链路, GGSN (作为 AR )具有 HA功能; UE中配置有特定的 APN, 且该特定的 APN已经在 HSS中该用户的签约数据中注册, DNS服务器也配 置有对应该特定 APN的具有 HA功能的 GGSN的 IP地址信息。 各步骤描述 下: S502, UE附着到 GPRS网络, 在附着过程中 HSS将包含特定 APN的用 户签约数据插入 SGSN, SGSN保存用户签约信息;
S504, UE发起激活 PDP上下文请求, 其中含有特定的 APN, 以及包含 UE支持 DSMIPv6协议的信息的 PCO, 该 PCO中包含有 UE支持 DSMIPv6 信息, 或者 UE请求获得家乡代理的 IP地址和请求网络分配家乡网络前缀 ( HNP ) 的信息, 或者 UE请求获得家乡代理的 IP地址的请求和请求网络分 配家乡地址(HoA ) 的信息, 或者 UE请求获得家乡代理的 IP地址的请求以 及请求网络分配家乡网络前缀( HNP )和家乡地址( HoA ) 的信息;
S506, SGSN收到上述请求后, 根据从 HSS/HLR获得的用户签约信息进 行认证和授权, 如果上述特定的 APN通过认证与授权, SGSN把该特定的 APN发送给DNS服务器, DNS服务器查找到对应该特定的 A— PN的 GGSN的 IP地址, 并发送给 SGSN; 上下文请求, 该请求消息中包含特定的 APN, 以及 UE发来的 PCO;
S510, GGSN收到上述消息后, 将为 UE分配 IPv4地址和 /或 IPv6地址 前缀(即 CoA ) 。 GGSN可以从特定的 APN中判断或者从 PCO中知道该 UE 支持 DSMIPv6,或者 GGSN从 SGSN转发来的 UE发出的 PCO中得知 UE请 求 GGSN告知 HA的 IP地址以及为该 UE分配 HNP和 /或 HoA, GGSN根据 上述信息以及自身还具有 HA功能, 判断需要向所述用户设.备提供家乡链路 信息,因此在建立 PDP上下文响应消息中,将 CoA和 PCO信息发送给 SGSN, 其中, PCO中包括 HA的 IP地址以及当前 GPRS接入网络是家乡链路的指示 或者 HoA和 /或 HNP。
该 PCO中包含信息可能的情况有: HA的 IP地址和当前 GPRS接入网络 是家乡链路的指示, 或者 HA的 IP地址和 HoA, 或者 HA的 IP地址和 HNP, 或者 HA的 IP地址以及 HoA和 HNP;
HoA是与 CoA( IPv4或 IPv6地址)一样的 IP地址; HNP是与 CoA ( IPv6 地址前缀)一样的 IPv6地址前缀,或者与 CoA( IPv6地址)的前缀一样的 IPv6 地址前缀; S512, SGSN收到上述消息后,通过激活 PDP上下文接受消息,将从 GGSN 收到的 CoA以及 PCO信息发送给 UE。 UE从 PCO中将获得家乡链路信息, 包括: HA的 IP地址; 如果 PCO中含有当前 GPRS网络是家乡链路的指示, 那么 UE就可以判断当前 GPRS网络是家乡链路; 如果 PCO中含有 HoA和 / 或 HNP, UE将其与从 GGSN获得的接入网地址( CoA ) 比较 IP地址或 IP 地址前缀, 只要判断出其中有一对(即 HNP和 CoA ( IPv6地址前缀 ) , 或者 HNP和 CoA ( IPv6地址 )的前缀部分, 或者 HoA ( IPv4地址 )和 CoA ( IPv4 地址) , 或者 HoA ( IPv6地址)和 CoA ( IPv6地址) )是相同的, 那么 UE 就可以判断当前 GPRS接入网络为家乡链路。
图 6是根据本发明方法的第四实施例的流程图。
如图 6所示, 本实施例描述的是 UE接入 E-UTRAN网络, E-UTRAN网 络是 UE的家乡链路, P-GW具有 AR与 HA功能, 各步骤描述如下:
S602, UE接入 E-UTRAN, UE向 MME发出附着请求, 该请求中包含 PCO, 该 PCO中包含有 UE支持 DSMIPv6信息, 或者 UE请求获得家乡代理 的 IP地址和请求网络分配家乡网络前缀( HNP ) 的信息, 或者 UE请求获得 家乡代理的 IP地址的请求和请求网络分配家乡地址(HoA ) 的信息, 或者 UE 请求获得家乡代理的 IP 地址的请求以及请求网络分配家乡网络前缀 ( HNP )和家乡地址(HoA ) 的信息;
S604, MME对该用户进行鉴权, 并且与 UE建立一个安全连接。 鉴权过 程中如果 MME中没有该用户的信息, 此时还需要 MME与 HSS进行交互以 对该用户进行鉴权;
S606, 在鉴权通过后, MME向 HSS发起位置更新请求, HSS将用户签 约数据插入 MME, 并确认位置更新成功;
S608, MME向 S-GW发起建立默认承载请求, 该请求中包含有 UE发来 的 PCO; S-GW收到该请求之后将该 PCO转发给 P-GW;
S610, P-GW收到上述消息后,将为 UE分配 IPv4地址和 /或 IPv6地址前 缀, 该 IPv4地址或 IPv6地址前缀是 UE的 CoA。 P-GW从 PCO中得知该 UE 支持 DSMIPv6,或者 UE请求获得家乡代理的 IP地址以及请求网络分配家乡 网络前缀(HNP )和 /或家乡地址(HoA ) , P-GW根据上述信息以及自身还 具有 HA功能, 判断需要向所述用户设备提供家乡链路信息, 因此在发给 S-GW的建立默认承载响应中, P-GW将 CoA以及 PCO发给 S-GW, PCO中 包含 P-GW的 IP地址以及当前 E-UTRAN接入网络是家乡链路的指示或者 HoA和 /或 HNP (与 CoA—样的 IP地址或地址前缀 ) , S-GW将上述信息转 发给 MME。
该 PCO中包含信息可能的情况有: P-GW的 IP地址和当前 E-UTRAN接 入网络是家乡链路的指示, 或者 P-GW的 IP地址和 HoA, 或者 P-GW的 IP 地址和 HNP, 或者 P-GW的 IP地址以及 HoA和 HNP;
HoA是与 CoA( IPv4或 IPv6地址)一样的 IP地址; HNP是与 CoA ( IPv6 地址前缀)一样的 IPv6地址前缀,或者与 CoA( IPv6地址)的前缀一样的 IPv6 地址前缀;
S612, MME将附着接受消息通过无线接入网络发送给 UE, 消息中包含 有 PCO。 其中无线接入网络使用无线资源控制连接重配置消息将 PCO通知 UE。 UE从 PCO中将获得家乡链路的信息, 包括: HA的 IP地址; 如果 PCO 中含有当前 E-UTRAN接入网络是家乡链路的指示,那么 UE就可以判断当前 网络是家乡链路; 如果 PCO中含有 HoA和 /或 HNP, UE将其与从 P-GW获 得的接入网地址(CoA )比较 IP地址或地址前缀,只要判断出其中有一对(即 HNP和 CoA ( IPv6地址前缀 ) , 或者 HNP和 CoA ( IPv6地址 )的前缀部分, 或者 HoA ( IPv4地址)和 CoA ( IPv4地址), 或者 HoA ( IPv6地址)和 CoA ( IPv6地址 ) )是相同的, 那么 UE就可以判断当前 E-UTRAN接入网络为 家乡链路。
S614, 完成初始附着, UE与 P-GW之间建立默认承载。
图 7是根据本发明方法的第五实施例的流程图。
如图 7所示, 本实施例描述的是 UE接入 E-UTRAN网络, UE发起建立 PDN连接请求。 E-UTRAN网络是 UE的家乡链路, P-GW具有 AR与 HA功 能, 各步骤描述如下:
S702, UE向 MME发出建立 PDN网络连接请求, 该请求中包含 PCO。 该 PCO中包含有: UE支持 DSMIPv6信息, 或者 UE请求获得家乡代理的 IP 地址和请求网络分配家乡网络前缀(HNP ) 的信息, 或者 UE请求获得家乡 代理的 IP地址的请求和请求网络分配家乡地址( HoA ) 的信息, 或者 UE请 求获得家乡代理的 IP地址的请求以及请求网络分配家乡网络前缀 ( HNP )和 家乡地址(I- - ΙοΑ ) 的信息;
S704, MME向 S-GW发起建立默认承载请求, 该请求中包含有 UE发来 的 PCO; S-GW收到该请求之后将该 PCO转发给 P-GW;
S706 , P-GW收到上述消息后,将为 UE分配 IPv4地址和 /或 IPv6地址前 缀, 该 IPv4地址和 /或 IPv6地址前缀是 UE的 CoA。 P-GW从 PCO中得知该 UE支持 DSMIPv6 , 或者 UE请求获得家乡代理的 IP地址以及请求网络分配 家乡网络前缀(HNP )和 /或家乡地址(HoA ) , P-GW根据上述信息以及自 身还具有 HA功能, 判断需要向所述用户设备提供家乡链路信息, 因此在发 给 S-GW的建立默认承载响应中, P-GW将 CoA以及 PCO发给 S-GW, PCO 中包含 P-GW的 IP地址以及当前 E-UTRAN接入网络是家乡链路的指示或者 HoA和 /或 HNP (与 CoA—样的 IP地址或地址前缀 ) , S-GW将上述信息转 发给 MME。
该 PCO中包含信息可能的情况有: P-GW的 IP地址和当前 E-UTRAN接 入网络是家乡链路的指示, 或者 P-GW的 IP地址和 HoA, 或者 P-GW的 IP 地址和 HNP, 或者 P-GW的 IP地址以及 HoA和 HNP;
HoA是与 CoA( IPv4或 IPv6地址)一样的 IP地址; HNP是与 CoA ( IPv6 地址前缀)一样的 IPv6地址前缀,或者与 CoA( IPv6地址)的前缀一样的 IPv6 地址前缀;
S708, MME将连接请求接受消息通过无线接入网络发送给 UE, 消息中 包含有 PCO。 该连接接受消息包括发给无线接入网络的承载建立响应和无线 接入网络发给 UE的无线资源控制连接重配置消息。 UE从 PCO中将获得家 乡链路的信息, 包括: HA的 IP地址; 如果 PCO中含有当前 E-UTRAN接入 网络是家乡链路的指示,那么 UE就可以判断当前网络是家乡链路;如果 PCO 中含有 HoA和 /或 HNP, UE将其与从 P-GW获得的接入网地址(CoA )比较 IP地址或地址前缀, 只要判断出其中有一对(即 HNP和 CoA ( IPv6地址前 缀) , 或者 HNP和 CoA ( IPv6地址) 的前缀部分, 或者 HoA ( IPv4地址) 和 CoA ( IPv4地址) , 或者 HoA ( IPv6地址)和 CoA ( IPv6地址) )是相 同的, 那么 UE就可以判断当前 E-UTRAN接入网络为家乡链路。
S710, 完成初始附着, UE与 P-GW之间建立默认承载。
本发明还提出一种用户获得家乡链路信息的系统, 包含用户设备、 接入 网络, 其中:
所述接入网络,用于通过协议配置选项 PCO携带家乡链路信息发送给所 述用户设备, 所述接入网络发送的家乡链路信息包含家乡代理的地址, 还包 含: 家乡地址和 /或家乡网络前缀 HNP, 或接入网络为家乡链路的指示;
所述用户设备,用于接收接入网络发送的 PCO,根据 PCO中携带的家乡 链路信息判断当前接入网络是否为家乡链路:
如果所述 PCO中携带当前接入网络为家乡链路的指示,则当前接入网络 为家乡链路;
如果所述 PCO中携带的家乡地址与所述特定的接入接口的地址相同,或 家乡网络前缀与所述特定接入接口的地址的前缀部分相同, 或家乡网络前缀 与所述特定接入接口的地址前缀相同, 则当前接入网络为家乡链路, 否则, 当前接入网络不是家乡链路。
综上所述, 釆用本发明的方法, 不需要对 UE进行预先配置也不需要用 户参与, 具有较好的应用灵活性。 釆用本方法将加快 UE使用 GPRS接入 I-WLAN Mobility架构或使用 E-UTRAN接入 EPS时发现家乡链路的速度,避 免了可能发生的分别找到独立的 GGSN与 HA的情况。
以上仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域 的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围 之内。 工业实用性
釆用本发明的方法, 不需要对 UE进行预先配置也不需要用户参与, 具 有较好的应用灵活性。 釆用本方法将加快 UE使用 GPRS 接入 I-WLAN Mobility架构或使用 E-UTRAN接入 EPS时发现家乡链路的速度, 避免了可 能发生的分别找到独立的 GGSN与 HA的情况。

Claims

权 利 要 求 书
1、 一种用户设备获得家乡链路信息的方法, 其特征在于,
用户设备附着到接入网络,接入网络通过协议配置选项 PCO携带家乡链 路信息发送给所述用户设备;
所述用户设备接收接入网络发送的 PCO,根据 PCO中的所述家乡链路信 息判断当前接入网络是否为家乡链路。
2、 如权利要求 1所述的方法,其特征在于, 所述家乡链路信息包含家 乡代理的地址, 还包含: 家乡地址和 /或家乡网络前缀, 或接入网络为家乡链 路的指示。
3、 如权利要求 2所述的方法, 其特征在于,
所述接入网络为所述用户设备分配特定的接入接口的地址或地址前缀; 所述用户设备根据如下方法判断当前接入网络是否为家乡链路: 如果所述 PCO中携带当前接入网络为家乡链路的指示,则当前接入网络 为家乡链路;
如果所述 PCO中携带的家乡地址与所述特定的接入接口的地址相同,或 家乡网络前缀与所述特定接入接口地址的前缀部分为相同, 或家乡网络前缀 与所述特定接入接口的地址前缀相同, 则当前接入网络为家乡链路, 否则, 当前接入网络不是家乡链路。
4、 如权利要求 1或 2或 3所述的方法, 其特征在于, 所述用户设备附 着到通用分组无线业务 GPRS网络时, 具体包含:
所述用户设备发送激活分组数据协议上下文请求至服务 GPRS 支持节 点, 所述请求中携带特定的接入点名称;
所述服务 GPRS支持节点收到所述激活分组数据协议上下文请求后, 向 网关 GPRS支持节点发送建立分组数据协议上下文请求, 请求中包含所述特 定的接入点名称;
所述网关 GPRS支持节点收到该建立分组数据协议上下文请求后, 为所 述用户设备分配特定的接入接口的地址或地址前缀即分配转交地址, 判断需 要向所述用户设备提供家乡链路信息, 在建立分组数据协议上下文响应消息 中将所述转交地址和 PCO发送给用户设备, 所述 PCO中包含家乡链路信息。
5、 如权利要求 4所述的方法, 其特征在于,
所述激活分组数据协议上下文请求中还包含 PCO ,所述 PCO携带表明所 述用户设备支持 DSMIPv6的信息; 或者, 携带获得家乡代理的 IP地址的请 求, 请求网络分配家乡网络前缀的信息和 /或请求网络分配家乡地址的信息; 所述建立分组数据协议上下文请求中包含该激活分组数据协议上下文请 求中的 PCO, 所述网关 GPRS支持节点收到该建立分组数据协议上下文请求 后, 根据所述特定的接入点名称判断所述用户设备支持 DSMIPv6, 需要向所 述用户设备提供家乡链路信息; 或所述网关 GPRS支持节点根据所述 PCO中 携带的信息判断需要向所述用户设备提供家乡链路信息。
6、 如权利要求 4所述的方法,其特征在于, 所述服务 GPRS支持节点 收到用户设备发来的激活分组数据协议上下文请求后, 使用从归属用户服务 器或归属位置寄存器发来的用户签约信息对用户设备进行认证和授权; 通过 认证和授权后, 所述服务 GPRS支持节点根据所述特定的接入点名称通过域 名系统服务器查询对应的网关 GPRS支持节点的 IP地址, 根据所述 IP地址 向对应的网关 GPRS支持节点发送建立分组数据协议上下文请求。
7、 如权利要求 1或 2或 3所述的方法, 其特征在于, 所述用户设备附 着到演进的分组系统 EPS时, 具体包含:
所述用户设备发送附着请求或者建立分组数据网络连接请求至移动性管 理实体, 所述请求中包含 PCO;
所述移动性管理实体收到所述包含 PCO 的附着请求或建立分组数据网 络连接请求后, 通过服务网关发送建立默认承载请求至数据网络网关, 所述 建立默认承载请求中包含所述附着请求或分组数据网络连接请求中的 PCO;
所述数据网络网关收到所述建立默认承载请求后, 为所述用户设备分配 特定的接入接口的地址或地址前缀即分配转交地址,根据所述 PCO判断需要 向所述用户设备提供家乡链路信息, 在建立默认承载响应消息中将所述转交 地址和 PCO发送给用户设备, 在该 PCO中包含家乡链路信息。
8、 如权利要求 7所述的方法,其特征在于, 所述附着请求或者建立分 组数据网络连接请求的 PCO中携带指示所述用户设备支持 DSMIPv6的信息, 或者, 携带获取家乡代理的 IP地址的请求, 请求网络分配家乡网络前缀的信 息和 /或请求网络分配家乡地址的信息。
9、 如权利要求 7所述的方法, 其特征在于,
所述移动性管理实体收到所述附着请求后, 对所述用户设备进行鉴权, 与用户设备建立安全连接;
鉴权通过后, 移动性管理实体向归属用户服务器发起位置更新请求, 归 属用户服务器将用户签约数据插入移动性管理实体, 确认位置更新成功; 移动性管理实体向服务网关发起建立默认承载请求, 所述建立默认承载 请求中包含所述附着请求中携带的 PCO;
服务网关收到所述建立默认承载请求后, 转发所述建立默认承载请求至 数据网络网关。
10、 一种用户获得家乡链路信息的系统, 包含用户设备、接入网络, 其 特征在于,
所述接入网络,用于通过协议配置选项 PCO携带家乡链路信息发送给所 述用户设备;
所述用户设备,用于接收接入网络发送的 PCO,根据 PCO中携带的家乡 链路信息判断当前接入网络是否为家乡链路。
11、 如权利要求 10所述的系统, 其特征在于, 所述接入网络还用于为 所述用户设备分配特定的接入接口的地址; 所述接入网络通过 PCO发送的家 乡链路信息包含家乡代理的地址, 还包含: 家乡地址和 /或家乡网络前缀, 或 接入网络为家乡链路的指示;
所述用户设备根据 PCO 中携带的家乡链路信息判断当前接入网络是否 为家乡链路是指: 如果所述 PCO中携带当前接入网络为家乡链路的指示, 则 当前接入网络为家乡链路;
如果所述 PCO中携带的家乡地址与所述特定的接入接口的地址相同,或 家乡网络前缀与所述特定接入接口的地址的前缀部分相同, 或家乡网络前缀 与所述特定接入接口的地址前缀相同, 则当前接入网络为家乡链路, 否则, 当前接入网络不是家乡链路。
12、 如权利要求 10或 11所述的系统,其特征在于, 所述接入网络为通 用无线分组业务网络, 所述接入网络进一步包括服务 GPRS支持节点和网关 GPRS支持节点, 其中,
所述服务 GPRS支持节点, 用于接收用户设备发送的激活分组数据协议 上下文请求, 该激活分组数据协议上下文请求中包含特定的接入点名称和 PCO, 所述 PCO携带表明所述用户设备支持 DSMIPv6的信息, 或者, 携带 获得家乡代理的 IP地址的请求、请求网络分配家乡网络前缀的信息和 /或请求 网络分配家乡地址的信息; 所述服务 GPRS支持节点还用于向网关 GPRS支 持节点发送建立分组数据协议上下文请求; 该建立分组数据协议上下文请求 中包含所述用户设备的特定的接入点名称和所述用户设备发送的 PCO;
所述网关 GPRS支持节点, 用于接收服务 GPRS支持节点发送的建立分 组数据协议上下文请求,为用户设备分配特定的接入接口的地址即转交地址, 发送建立分组数据协议上下文响应消息至用户设备, 所述消息中包含转交地 址和 PCO, 该 PCO中包含家乡链路信息。
13、 如权利要求 10或 11所述的系统,其特征在于, 所述接入网络为演 进的分组系统, 所述接入网络进一步包括移动性管理实体、 服务网关和数据 网络网关, 其中,
所述移动性管理实体,用于接收用户设备发送的包含 PCO的附着请求或 建立分组数据网络连接请求, 向服务网关发送建立默认承载请求, 所述建立 默认承载请求中携带用户设备发送的 PCO,该 PCO中携带指示所述用户设备 支持 DSMIPv6的信息, 或者, 携带获取家乡代理的 IP地址的请求、 请求网 络分配家乡网络前缀的信息和 /或请求网络分配家乡地址的信息;
所述服务网关, 用于接收移动性管理实体发送的建立默认承载请求, 发 送建立默认承载请求至数据网络网关, 所述建立默认承载请求中携带移动性 管理实体发送的 PCO;
所述数据网络网关, 用于接收服务网关发送的建立默认承载请求, 根据 该建立默认承载请求中的 PCO, 为所述用户设备分配特定的接入接口的地址 即转交地址, 通过服务网关将转交地址和 PCO发送给用户设备, 该 PCO中 携带家乡链路信息。
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