US20080274736A1 - Method and system for implementing data routing of roaming user - Google Patents

Method and system for implementing data routing of roaming user Download PDF

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US20080274736A1
US20080274736A1 US12/173,554 US17355408A US2008274736A1 US 20080274736 A1 US20080274736 A1 US 20080274736A1 US 17355408 A US17355408 A US 17355408A US 2008274736 A1 US2008274736 A1 US 2008274736A1
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roaming
network
address
default
bearer
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Weihua HU
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of US20080274736A1 publication Critical patent/US20080274736A1/en
Priority to US12/613,828 priority Critical patent/US8891443B2/en
Priority to US14/542,803 priority patent/US9763077B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing 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
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing 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
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4588—Network directories; Name-to-address mapping containing mobile subscriber information, e.g. home subscriber server [HSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • the invention relates to mobile communication, and more particularly, to a method and system for implementing data routing of a roaming mobile user.
  • the ability of possessing rapid increasing IP data service by the evolved mobile communication system should be enhanced, and the employment of packet technology in the mobile communication system should be further improved.
  • the most important parts in this kind of technology evolution include: reducing time-delay and latency time, increasing user data rate, increasing system capacity, enlarging coverage area, and decreasing overall cost of the operator.
  • the backward compatibility of the evolved network architecture to the existing network is also an important consideration.
  • an attaching process and a Packet Data Protocol (PDP) context activating process are two separated processes.
  • a terminal Once powered on, a terminal firstly performs a General Packet Radio Service (GPRS) attaching process, which mainly includes a security process and a location updating process.
  • GPRS General Packet Radio Service
  • the terminal does not simultaneously acquire an IP bearer. Only when the terminal further initiates the PDP context activating process, the terminal may be provided with an IP address and corresponding configuration parameters.
  • a network registration and a default IP bearer establishment are performed together in a System Architecture Evolution (SAE)/long-term evolution (LTE) system proposed in a Specification, i.e., during the mobile terminal attaches to the network for the first time, the network allocates an IP address and some corresponding bearer resources to the mobile terminal. In this case, it is not specified whether or not the air-interface resource should be allocated.
  • SAE System Architecture Evolution
  • LTE long-term evolution
  • the 3GPP Technology Report (TR) 23.882 made by 3GPP SA2 group provides a possible process of network attaching suggested by the current 3GPP TR (23.882) as follows:
  • Network Discovery and Access System Selection a terminal of a mobile user discovers SAE/LTE access systems and then performs access system and network selection.
  • Attaching Request the terminal initiates an Attaching Request, which includes old registration information of the user (for example, temporary ID), to a Mobility Management Entity/User Plane Entity (MME/UPE).
  • the Attaching Request includes a permanent ID of the user if the terminal does not report the old registration information of the user.
  • the Attaching Request may include information for default IP bearer (for example, IP address or APN selected by the user).
  • the old MME/UPE sends the context information of the user to the new MME/UPE, and the context information includes the permanent ID of the user, security context parameters, and so on.
  • MME Registration Updating the new MME/UPE initiates a registration updating request toward a Home Subscriber Server (HSS), and registers as the MME/UPE currently serving the mobile user.
  • HSS Home Subscriber Server
  • the HSS instructs the old MME/UPE to delete the context information of mobile user.
  • the HSS confirms the registration of the new MME/UPE.
  • the subscription information for the default IP bearer, the relevant Quality of Service (QoS) strategy and the charging control information are also sent to the MME/UPE.
  • QoS Quality of Service
  • Inter System Mobility Anchor An Inter AS Anchor is selected, and the selection mechanism is not specified.
  • the IP address configuration is determined based on user's preference or subscribed data, or based on the strategy of Public Land Mobile Network (PLMN) or VPLMN.
  • PLMN Public Land Mobile Network
  • (9) User Plane Routing Configuration the Inter AS Anchor performs the IP layer configuration according to the determined IP address of the user. The User Plane is established and the basic strategies and charging rules are applied. It is not specified whether the establishment of the User Plane is initiated by the terminal or by the MME/UPE.
  • IP Bearer QoS Configuration the MME/UPE provides QoS Configuration of a default IP bearer (for example, the upper limit of data rate) to an evolved RAN. It is not specified whether a trigger mechanism is needed for this QoS Configuration (for example, it is needed when sending uplink or downlink data).
  • Attachment Accept the MME/UPE sends an attachment accept message indicating the acceptance of the terminal, and allocates a temporary ID for the terminal, the user's IP address is also sent to the terminal. In a roaming scene, roaming restrictions are checked, and the attachment is denied if the restrictions are violated.
  • the default IP bearer established during the user attaching process may bear IP-based protocol signaling, such as SIP protocol used by IP Multimedia Subsystem (IMS), as well as other potential services which may adopt default QoS controlling strategy and charging strategy.
  • IP-based protocol signaling such as SIP protocol used by IP Multimedia Subsystem (IMS)
  • IMS IP Multimedia Subsystem
  • the QoSs required by upper layer application services are different largely from each other, and usually cannot be satisfied by the QoS provided by the default IP bearer.
  • the mobile user may continuously adopt the secondary PDP activating process which is similar to the existing process, based on the default IP bearer which has already been established, to accelerate the subsequent establishment processes for other service bearers and enhance the reaction speed of the system.
  • the IP address allocation strategy for the default IP bearer acquired in the registering process of the mobile user is very important, in that the strategy directly decides the data plane routing of the services of default IP address.
  • the evolved network requires the ability for optimizing the user plane routing of the roaming user.
  • the data of the roaming user are transmitted to the destination directly through the roaming network, rather than being routed back to the home network.
  • the optimization of the user plane routing need be controllable for the home network of the user, so as to guarantee the benefits of the home network operator.
  • Embodiments of the invention provide a method and system for implementing data routing of a roaming user, so as to control the IP address allocation for the default IP bearer of the roaming user and establish a user plane data routing of the roaming user which is controllable by the home network operator.
  • Embodiments of the invention provide a method for implementing data routing for a roaming user, including:
  • Embodiments of the invention further provide a system for implementing data routing of a roaming user, including a roaming network element and a Home Subscriber Server (HSS),
  • HSS Home Subscriber Server
  • the HSS, on which a roaming protocol is stored, is adapted to determine an IP address allocation strategy according to the roaming protocol
  • the roaming network element is adapted to select one of the home network and the roaming network to allocate an IP address according to the IP address allocation strategy determined by the HSS, and establish a default IP bearer.
  • the home network operator may comprehensively consider various relevant factors, such as the maturity of the roaming interconnection between the home network operator and the roaming network operator and so on, during the registering process of the mobile user in the roaming network, so as to control the allocation strategy of the default IP bearer address, i.e., so as to determine which one of the home network and the roaming network is to allocate the IP address for the default IP bearer.
  • Embodiments of the invention implement the data plane routing optimization of the roaming user under the control of the home network operator, i.e., when the home network operator determines that the IP address for the default IP bearer may be allocated by the roaming network based on above mentioned factors, the IP address for the default IP bearer is allocated by the roaming network, so as to optimize the routing of the data plane for the roaming user to bear services by the default IP bearer.
  • the IP address of the default IP bearer for the roaming user may be allocated by the roaming network as much as possible, so as to optimize the routing of the data plane for the roaming user, improve the performance of the data service, and bring a better service experience to the roaming user.
  • FIG. 1 shows a flowchart for network attaching in 3GPP TR 23.882
  • FIG. 2 shows a architecture diagram of a radio evolved network
  • FIG. 3 shows a flowchart for network attaching of a roaming user according to an embodiment of the invention
  • FIG. 4 shows a flowchart for network attaching of a roaming user according to another second embodiment of the invention
  • a core network of a radio evolved network mainly includes three logic function entities: Mobility Management Entity (MME), User Plane Entity (UPE), and Inter AS Anchor (Inter AS Anchor is a user plane anchor for mobility between different access systems).
  • MME Mobility Management Entity
  • UPE User Plane Entity
  • Inter AS Anchor is a user plane anchor for mobility between different access systems.
  • the MME corresponds to a control plane part of a Serving GPRS Support Node (SGSN) inside a current Universal Mobile Telecommunication System (UMTS), and is responsible for the mobility management of the control plane, including the management of user context and mobility states as well as the allocation of user contemporary ID and security functions.
  • SGSN Serving GPRS Support Node
  • UMTS Universal Mobile Telecommunication System
  • the UPE corresponds to a data plane part of a GGSN and SGSN inside the current UMTS system, and is responsible for initiating a paging for downlink data under the idle state, managing and saving IP bearer parameters and intra network route information.
  • the Inter AS Anchor acts as a user plane anchor for mobility between difference access systems. The functions of each interface in FIG. 2 and whether or not these interfaces exist are not finally specified.
  • GERAN is GSM EDGE Radio Access Network
  • UTRAN is UMTS Terrestrial Radio Access Network
  • CN is Core Network
  • MS Mobile Subscriber
  • UE User Equipment
  • PCRF Policy and Charging Rules Function.
  • the home network operator controls the allocation of IP address of the default IP bearer for the roaming user. If capabilities of an element phone need to be taken into consideration during the interactive negotiation, the element phone needs to carry such information about its capabilities in an attaching request message, and the information about its capabilities is included in a registration updating request sent to the HSS by the MME/UPE of the roaming network. Based on the mobile subscriber ID and the visited PLMN where the user currently is located as well as taking the capabilities of the element phone into consideration, the HSS inquires the strategy configuration of the operator and determines whether or not the roaming network of the PLMN is allowed to allocate the IP address of the default IP bearer. The details are shown as follows:
  • a flow of network attaching process for optimizing data routing of a roaming user including the following steps:
  • S 101 Network Discovery and Access system selection: a terminal of a mobile user discovers SAE/LTE access systems and then selects an access system and network.
  • Attaching Request the terminal initiates an Attaching Request, which includes old registration information of the user (for example, temporary ID), to an MME/UPE.
  • the Attaching Request includes a permanent ID of the user if the terminal does not report the old registration information of the user.
  • the Attaching Request may include information for default IP bearer (for example, IP address or APN selected by the user).
  • the old MME/UPE sends the context information of the user to the new MME/UPE, and the context information includes the permanent ID of the user, security context parameters, and so on.
  • MME Registration Updating (PLMN ID): the new MME/UPE initiates a registration updating request toward an HSS, and registers as the MME/UPE currently serving the mobile user.
  • the registration updating request message includes the PLMN ID of the PLMN where the user is located currently.
  • Deleting user registration information the HSS instructs the old MME/UPE to delete the context information of the mobile user.
  • the operator to which the user belongs may in advance configure different roaming strategies for each user or certain class of users with respect to different PLMNs, and save the strategies in a database.
  • the strategies may allow the default IP address of a class A user to be allocated by VPLMN 1 , the default IP address of a class B user to be allocated by VPLMN 2 , and the default IP address of a class C user to be only allocated by the home network.
  • the HSS inquires the above mentioned strategy configuration of the operator and determines whether or not the roaming network of the PLMN is allowed to provide the IP address allocation for the default IP bearer.
  • the HSS confirms the successful registration of the new MME/UPE.
  • the subscribed data of the user are sent to the new MME/UPE.
  • the subscription information related to the default IP bearer, the relevant QoS strategy, the charging rules information and so on are also sent to the new MME/UPE.
  • the registration response message returned by the HSS includes a information element, i.e., VPLMN IP Address Allowed, for indicating whether or not the roaming network is allowed to allocate the IP address for the default IP bearer:
  • VPLMN IP Address Allowed TRUE, the roaming network is allowed to allocate the IP address for the default IP bearer
  • VPLMN IP Address Allowed FALSE, the roaming network is not allowed to allocate the IP address for the default IP bearer, and the IP address needs to be allocated by the home network.
  • Default IP bearer Establishment According to the indication of the information element (VPLMN IP Address Allowed) included in the registration response message returned by the HSS, the MME/UPE selects one of the home network and the roaming network to allocate the IP address, then the network performs IP layer configuration for the default IP address, the User Plane is established and the basic QoS strategy and charging rules are applied. It is not discussed herein as to which network element allocates the IP address, the IP bearer establishing process may be similar to that as illustrated in FIG. 2 .
  • Attachment Accept the MME/UPE informs the terminal that its attaching request is accepted, and allocates a contemporary ID for the terminal, the allocated user's IP address is also sent to the terminal. In a roaming scene, roaming restrictions are checked, and the attachment is denied if the restrictions are violated.
  • FIG. 4 shows another embodiment of the invention.
  • non-transparent services such as IMS service, which is not transparent to the access network equipments when the IMS service needs support from the roaming network equipments
  • IP bearer a series of service IDs or service types are defined, and a TLV (type-length-value) format may be adopted as follows:
  • the Service ID List Type or Service Type List Type is the identification of the whole information element for identifying the appearance of the information element.
  • the Service ID List Length or Service Type List Length is the length of the whole information element in unit of bytes.
  • Each service ID occupies one bit or employs a service ID value; or each service type occupies one bit or employs a service type value.
  • a method for optimizing data routing of a roaming user including the following steps:
  • Network Discovery and Access system selection a terminal of a mobile user discovers SAE/LTE access systems and then selects an access system and network.
  • Attaching Request (Service ID List): the terminal initiates an Attaching Request, which includes old registration information of the user (for example, temporary ID), to an MME/UPE.
  • the Attaching Request includes a permanent ID of the user if the terminal does not report the old registration information of the user.
  • the Attaching Request may include information for default IP bearer (for example, IP address or APN selected by the user).
  • the Attaching Request carries a service ID list or a service type list of non-transparent services of the default IP bearer for the mobile terminal. For example, if the terminal requires the default IP bearer to bear IMS service, the bit corresponding to IMS in the Service ID List information element of the Attaching Request message is set to 1, and all the other bits are set to 0; alternatively, the service ID value in the Service ID List information element or the bit corresponding to IMS in the Service Type List information element of the Attaching Request message is set to 1, and all the other bits are set to 0 or values corresponding to service types in the Service Type List information element.
  • the old MME/UPE sends the context information of the user to the new MME/UPE, and the context information includes the permanent ID of the user, security context parameters, and so on.
  • MME Registration Updating PLMN ID, Service ID List/Service Type List
  • PLMN ID Service ID List/Service Type List
  • the new MME/UPE initiates a registration updating request toward the HSS, and registers as the MME/UPE currently serving the mobile user.
  • the registration updating request includes the PLMN ID of the PLMN where the user is located currently and the updated Service ID List or Service Type List, which indicates the service list of the default IP bearer for the mobile user in the current roaming network; i.e., the intersection set service list allowed by the default IP bearer, which are both requested by the user and supported by the system.
  • the roaming network supports the IMS service, the bit corresponding to IMS in the Service ID List information element of the Register Updating Request sent from the MME/UPE to the HSS is set to 1 or the service ID value in the information element is set to 1, alternatively, the bit corresponding to IMS in the Service Type List information element of the Register Updating Request is set to 1 or the service type value in the information element is set to 1.
  • the bit corresponding to IMS is set to 0, or the service ID value is set to 0, or the service type value is set to 0.
  • Deleting user registration information the HSS instructs the old MME/UPE to delete the context information of mobile user.
  • the operator to which the user belongs may in advance configure different roaming strategies for each user or certain class of users with respect to different PLMNs, and save the strategies in a database.
  • the HSS inquires the above mentioned strategy configuration of the operator to acquire the services which may be borne by the default IP bearer provided by the roaming PLMN network, and matches the services with the received service list of the default IP bearer in the current roaming network. According to the result of matching, the HSS determines whether or not the roaming network is allowed to provide the IP address allocation for the default IP bearer. If the default IP address is allocated by the roaming network, the HSS further determines the services which may be borne by the IP allocated by the roaming network.
  • the HSS confirms the successful registration of the new MME/UPE, and the subscribed data of the user are transmitted to the new MME/UPE.
  • the subscription information of the default IP bearer, relevant QoS strategy and charging control information are also transmitted to the new MME/UPE.
  • step S 207 According to the matching result in step S 207 :
  • Service ID List/Service Type List an information element that indicates the service list of the default IP bearer.
  • Default IP bearer Establishment According to the indication of the information element (VPLMN IP Address Allowed) included in the registration response message returned from the HSS, the MME/UPE selects one of the home network and the roaming network to allocate the IP address; then the network performs IP layer configuration for the default IP address, the User Plane is established and the basic QoS strategy and charging rules are applied. It is not discussed herein as to which network element allocates the IP address, the IP bearer establishing process may be similar to that as illustrated in FIG. 2 .
  • Attachment Accept (Service ID List): the MME/UPE informs the terminal that its attaching request is accepted, and allocates a contemporary ID for the terminal, the allocated user's IP address is also sent to the terminal.
  • roaming restrictions are checked, and the attachment is denied if the restrictions are violated.
  • the MME/UPE further informs the mobile user, via the Attachment Accept message, the service list allowed by the default IP bearer and the service list is returned from the HSS.
  • Attachment Confirmation the terminal confirms the success of the attachment.
  • the mobile user may initiates IMS registration and other services that may be borne by the default IP bearer. If the mobile terminal receives the service list allowed by the default IP bearer returned by the network, the mobile terminal determines whether or not a service to be initiated subsequently belongs to the above mentioned service list. If the service does not belong to the service list, the mobile terminal needs to initiate a process which is similar to the existing first PDP activating process, so as to establish a new default IP bearer for the service. The IP address of the established new default IP bearer is different from the IP address of the default IP bearer.
  • the HSS indicates that the IP address of the default IP bearer may be allocated by the roaming network and only IMS services may be borne by the default IP bearer.
  • the terminal initiates a IMS registration in a later time, the default IP bearer established during the network registering process may be used directly; if the terminal initiates a non-IMS service such as a VPN service in a later time, the terminal needs to initiate a process which is similar to the first PDP activating process of the existing 3GPP, so as to acquire a new IP address.
  • the MME and UPE are drawn together as a single unit in the schematic diagram, the MME and UPE may be separated in practice.
  • the location of Inter AS Anchor in a network does not influence the adaptability of the invention.
  • the Inter AS Anchor and the UPE may be located in a same network node.
  • the IP address of the default IP bearer for the roaming user may be allocated by the roaming network as much as possible, so as to optimize the data plane routing of the roaming user, enhance the performance of data service, and bring better service experience for the roaming user.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
US12/173,554 2006-01-26 2008-07-15 Method and system for implementing data routing of roaming user Abandoned US20080274736A1 (en)

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US12/613,828 US8891443B2 (en) 2006-01-26 2009-11-06 Method and system for implementing data routing of roaming user
US14/542,803 US9763077B2 (en) 2006-01-26 2014-11-17 Method and system for implementing data routing of roaming user

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CN200610033435.1 2006-01-26
CNB2006100334351A CN100488284C (zh) 2006-01-26 2006-01-26 一种3gpp演进网络中漫游用户数据路由优化方法
PCT/CN2007/000276 WO2007087745A1 (fr) 2006-01-26 2007-01-25 Procédé et système pour la mise en oeuvre d'acheminement de données de l'utilisateur itinérant

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CN100488284C (zh) 2009-05-13
ATE480085T1 (de) 2010-09-15
DE602007008830D1 (de) 2010-10-14
US20100046438A1 (en) 2010-02-25
US9763077B2 (en) 2017-09-12
EP1978706A4 (fr) 2009-02-18
ES2352516T3 (es) 2011-02-21
WO2007087745A1 (fr) 2007-08-09
US20150071177A1 (en) 2015-03-12
US8891443B2 (en) 2014-11-18
CN1859776A (zh) 2006-11-08
EP1978706B1 (fr) 2010-09-01
EP1978706A1 (fr) 2008-10-08

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