WO2017054611A1 - 用户设备初始附着方法及系统 - Google Patents

用户设备初始附着方法及系统 Download PDF

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WO2017054611A1
WO2017054611A1 PCT/CN2016/097651 CN2016097651W WO2017054611A1 WO 2017054611 A1 WO2017054611 A1 WO 2017054611A1 CN 2016097651 W CN2016097651 W CN 2016097651W WO 2017054611 A1 WO2017054611 A1 WO 2017054611A1
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pgw
sgw
session
enodeb
address
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English (en)
French (fr)
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王丹
孙滔
刘超
陆璐
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China Mobile Communications Group Co Ltd
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China Mobile Communications Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • 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
    • H04W8/14—Mobility data transfer between corresponding nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/66—Policy and charging system

Definitions

  • the present disclosure relates to a communication device attachment technology, and in particular, to a method and system for initial attachment of a user equipment (UE, User Equipment) after a gateway control forwarding separation.
  • UE User Equipment
  • the EPC gateway device includes both routing and forwarding functions, as well as related functions of signaling processing and even service processing. Two types of functions are tightly coupled relationships, and the communication between them depends on the internal implementation. The high degree of coupling between the control plane and the forwarding plane of the gateway device makes the device update period long and the composite cost increases, which is not conducive to the smooth evolution of the core network.
  • an embodiment of the present disclosure provides a user equipment initial attachment method and system.
  • a user equipment initial attaching method in which a control plane function and a forwarding plane function of a serving gateway SGW and a packet data gateway PGW are separated in a mobile network; the method includes:
  • the mobility management unit MME After receiving the attach request of the user equipment UE, the mobility management unit MME sends a create session request to the control plane SGW-C of the SGW;
  • the SGW-C establishes between the SGW-C and the forwarding plane SGW-U of the SGW according to the attach request.
  • the SGW-C sends a create session request to the control plane PGW-C of the PGW;
  • the PGW-C After receiving the create session request, the PGW-C establishes an IP-CAN session with the policy and charging rule function PCRF; the PGW-C allocates an IP address to the user UE;
  • the PGW-C establishes a session with the forwarding plane PGW-U of the PGW, and sends a create session response to the SGW-C;
  • SGW-C forwards a create session response to the MME
  • the MME confirms the session establishment with the UE through the base station eNodeB;
  • the eNodeB transmits the tunnel endpoint identifier TEID information of the eNodeB and the IP address information of the eNodeB to the SGW-U through the MME and the SGW-C in the form of modifying the bearer;
  • the UE performs data transmission through the eNodeB, the SGW-U, and the PGW-U.
  • the one SGW-C is connected to at least one SGW-U;
  • the one PGW-C is connected to at least one PGW-U.
  • the PGW-C when the one PGW-C is connected to multiple PGW-Us, the PGW-C selects an appropriate PGW-U, and is in the IP address pool corresponding to the PGW-U.
  • the UE allocates an IP address.
  • the PGW-C when the PGW-C establishes a session between the PGW-C and the PGW-U, the PGW-U is notified of the IP address to which the UE is assigned.
  • the creation session request sent by the SGW-C to the PGW-C includes at least the IP address information of the PGW-U involved in the session to be established.
  • a user equipment initial attach system comprising: an eNodeB, a mobility management unit MME, a serving gateway SGW, a packet data gateway PGW, and a policy and charging rule function PCRF, wherein the SGW and PGW control plane function and forwarding plane function separation;
  • the MME after receiving the attach request of the user equipment UE, sends a create session request to the control plane SGW-C of the SGW;
  • SGW-C configured to establish, according to the attach request, a session between the SGW-C and the forwarding plane SGW-U of the SGW;
  • the PGW-C is configured to: after receiving the request for creating a session, establish an IP-CAN session with the PCRF, and allocate an IP address to the user UE;
  • the SGW-C is further configured to forward a create session response to the MME.
  • the MME is further configured to confirm the session establishment with the UE by using the eNodeB.
  • the eNodeB is configured to transmit the TEID of the eNodeB and the IP address information of the eNodeB to the SGW-U through the MME and the SGW-C in the form of the modified bearer;
  • the UE is used for data transmission through the eNodeB, the SGW-U, and the PGW-U.
  • the one SGW-C is connected to at least one SGW-U;
  • the one PGW-C is connected to at least one PGW-U.
  • the PGW-C when the one PGW-C is connected to multiple PGW-Us, the PGW-C is also used to select an appropriate PGW-U from the IP address corresponding to the PGW-U.
  • the UE is assigned an IP address in the pool.
  • the PGW-C is further configured to notify the PGW-U of the IP address to which the UE is assigned when establishing a session between the PGW-C and the PGW-U.
  • the creation session request sent by the SGW-C to the PGW-C includes at least the IP address information of the PGW-U involved in the session to be established.
  • the MME after receiving the attach request of the user equipment UE, the MME sends a create session request to the control plane of the SGW; the control plane of the SGW establishes the forwarding of the SGW control plane and the SGW according to the attach request.
  • the embodiment of the present disclosure separates the control plane and the forwarding plane of the gateway, simplifies the function of the forwarding plane device, and improves data forwarding efficiency.
  • the embodiment of the present disclosure also minimizes the modification of the interface between the existing network elements, adapts to the flat network architecture, and is more conducive to the evolution of the network architecture.
  • FIG. 1 is a schematic flowchart of a method for initial attachment of a user equipment according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a network architecture after a gateway control plane forwarding plane is separated according to an embodiment of the present disclosure
  • FIG. 3 is a schematic timing diagram of a method of initial attachment of a user equipment according to an embodiment of the present disclosure.
  • the control plane function of the serving gateway (SGW, Serving GateWay) and the packet data gateway (PGW, Packet Data Network GateWay) in the communication system is separated from the forwarding plane function.
  • the separated network adds two interfaces, namely, the connection interface between the control plane and the forwarding plane of the SGW, and the connection interface between the control plane and the forwarding plane of the PGW.
  • FIG. 1 is a schematic flowchart of a user equipment initial attachment method according to an embodiment of the present disclosure. As shown in FIG. 1 , the user equipment initial attachment method in the embodiment of the present disclosure includes the following steps 101 to 109.
  • step 101 after receiving the attach request of the UE, the mobility management unit (MME, Mobility Management Entity) sends a create session request to the control plane of the SGW.
  • MME Mobility Management Entity
  • the UE first sends an attach request to the base station, and after receiving the attach request sent by the UE, the base station forwards the attach request to the MME.
  • the MME After receiving the attach request of the UE, the MME sends a create session request to the control plane of the SGW.
  • step 102 the control plane of the SGW establishes a session between the control plane of the SGW and the forwarding plane of the SGW according to the attach request.
  • the control plane of the SGW After receiving the attach request, the control plane of the SGW establishes a session between the control plane of the SGW and the forwarding plane of the SGW.
  • step 103 the control of the SGW sends a create session request to the control plane of the PGW.
  • the control of the SGW After establishing a session between the control plane of the SGW and the forwarding plane of the SGW, the control of the SGW sends a create session request to the control plane of the PGW.
  • step 104 after receiving the create session request, the control plane of the PGW establishes an IP-CAN session with the Policy and Charging Rules Function (PCRF) and assigns an IP address to the UE.
  • PCRF Policy and Charging Rules Function
  • step 105 the control plane of the PGW establishes a session between the control plane of the PGW and the forwarding plane of the PGW, and sends a create session response to the control plane of the SGW.
  • step 106 the control of the SGW forwards the create session response to the MME.
  • step 107 the MME confirms the session establishment with the UE through the base station.
  • the eNodeB transmits the TEID of the eNodeB and the IP address information of the eNodeB to the forwarding plane of the SGW through the control plane of the MME and the SGW.
  • step 109 the UE performs data transmission through the forwarding plane of the eNodeB, the SGW, and the forwarding plane of the PGW.
  • one control plane of the SGW is connected to a forwarding plane of at least one SGW;
  • a control plane of the PGW is connected to a forwarding plane of at least one PGW.
  • the forwarding plane of the PGW is notified to the IP address assigned by the UE.
  • control session sent by the SGW to the control plane of the PGW includes at least the IP address information of the forwarding plane of the PGW to be established.
  • the control plane of the PGW when a control plane of the PGW is connected to a forwarding plane of multiple PGWs, the control plane of the PGW allocates an IP address to the UE from the corresponding IP address pool.
  • FIG. 2 is a schematic diagram of a network architecture after a gateway control plane forwarding plane is separated according to an embodiment of the present disclosure.
  • the SGW is separated from the control plane and the forwarding plane of the PGW.
  • the control plane of the SGW is called SGW-C
  • the forwarding plane of the SGW is called SGW-U
  • the control plane of the PGW is called PGW-C.
  • the forwarding surface is called PGW-U.
  • the SGW-C manages the data forwarding at the SGW-U level
  • the PGW-C manages the data forwarding at the PGW-U level.
  • the control plane and the forwarding plane of the SGW and the PGW are uniformly set, and there is no separation between the control plane and the forwarding plane.
  • one control plane device can be used for multiple forwarding plane devices, which facilitates the expansion of the forwarding plane device and enhances the flexibility of data forwarding.
  • one PGW-C can control multiple PGW-Us.
  • the PGW-C needs to configure the IP address pool corresponding to each PGW-U.
  • the PGW-C allocates an address to the UE from the corresponding address pool and establishes a connection channel to the PGW-U.
  • the charging policy delivered by the PCRF is managed by the PGW-C and delivered to the PGW-U as required.
  • the PGW-U needs to bear the charging-related functions such as traffic statistics, and reports it to the PGW-C, which synthesizes the charging information by the PGW-C.
  • two interfaces are added in the network architecture, that is, an interface between the SGW-C and the SGW-U, and an interface between the PGW-C and the PGW-U. Therefore, the related process of the GTP control plane GTP-C in the existing GPRS Tunnel Protocol needs to be extended to implement the control of the forwarding plane device SGW-U by the SGW-C, and the PGW-C pair forwarding plane Control of the device PGW-U.
  • the interface and protocol of other network element devices in the network are kept as much as possible.
  • FIG. 3 is a schematic timing diagram of a method for initial attachment of a user equipment according to an embodiment of the present disclosure. As shown in FIG. 3, after the core network gateway control plane is separated from the forwarding plane, the initial user attach procedure includes the following steps 1 to 15.
  • step 1 the eNodeB sends an attach request to the MME.
  • the base station eNodeB After receiving the attach request sent by the UE, the base station eNodeB forwards the attach request to the MME.
  • the MME sends a create session request to the SGW-C.
  • the message includes, but is not limited to, the Tunnel Endpoint Identifier (TEID), the SGW-U address, and the PGW-C address (PGW-C). Address), PGW-U address (PGW-U address), PDN address (PDN Address).
  • step 3 SGW-C establishes a session between the control plane and the forwarding plane with SGW-U (create Session between CU).
  • the message sent by the SGW-C to the SGW-U includes but is not limited to: SGW-C TEID, PGW-U address, etc. (the PGW-C address is not required to be included).
  • the message that the SGW-U replies to the SGW-C includes but is not limited to: SGW-U TEID.
  • the SGW-C sends a create session request to the PGW-C.
  • the message includes but is not limited to: PGW-U address, SGW-U address, SGW-U TEID, SGW-C TEID, PDN Address.
  • PGW-C establishes an IP-CAN with the PCRF.
  • the PGW-C assigns an IP address to the PDN connection of the UE.
  • the PGW-C provides the UE IP address, Default EPS Bearer QoS to the PCRF, and obtains charging policy information and QoS information such as APN-AMBR, QCI, and ARP.
  • the PGW-C When the PGW-C corresponds to multiple PGW-Us, the PGW-C allocates an address for the UE from the corresponding IP address pool according to the address of the PGW-U.
  • PGW-C and PGW-U establish create session between CU.
  • the information sent by the PGW-C to the PGW-U includes but is not limited to: SGW-U address, SGW-U TEID, PGW-C TEID, PDNAddress (including the IP address of the UE) and the like.
  • the information that the PGW-U replies to the PGW-C includes but is not limited to: PGW-U TEID.
  • the PGW-C sends a create session response to the SGW-C.
  • the information includes but is not limited to: PGW-U address, PGW-U TEID, PGW-C TEID, PDN Address (including the IP address of the UE).
  • the SGW-C sends a create session response to the MME.
  • the information includes but is not limited to: PDN Address (including the IP address of the UE), SGW-U address, SGW-U TEID, SGW-C TEID, PGW-C address, PGW-C TEID, PGW-U address, PGW-U TEID.
  • the MME sends an initial context setup request/attach accept to the eNodeB.
  • the message includes but is not limited to: SGW-U address, SGW-U TEID, SGW-C TEID, SGW-C address, PDN Address (including the IP address of the UE).
  • the eNodeB sends an initial context response message/attach complete message to the MME.
  • the message includes but is not limited to: eNodeB TEID, eNodeB address.
  • step 11 the MME sends a modify bearer request to the SGW-C.
  • the message includes but is not limited to: eNodeB address, eNodeB TEID.
  • the SGW-C sends a modify bearer between CU to the SGW-U.
  • the elimination Information includes but is not limited to: eNodeB address, eNodeB TEID.
  • step 13 the SGW-C sends a modify bearer response to the MME.
  • step 14 the UE sends an uplink data packet to the SGW-U and the PGW-U through the eNodeB.
  • step 15 the downlink data packet arrives at the UE from the PGW-U via the SGW-U and the eNodeB.
  • the initial attaching system of the embodiment of the present disclosure includes: an eNodeB, an MME, an SGW, a PGW, and a PCRF, wherein the control plane function and the forwarding plane function of the SGW and the PGW are separated.
  • the control plane of the SGW is referred to as SGW-C
  • the forwarding plane of the SGW is referred to as SGW-U
  • the control plane of the PGW is referred to as PGW-C
  • the forwarding plane of the PGW-U the forwarding plane of the PGW-U.
  • the MME is configured to send a create session request to the SGW-C after receiving the attach request of the UE;
  • SGW-C configured to establish a session between the SGW-C and the SGW-U according to the attach request
  • the PGW-C is configured to: after receiving the request for creating a session, establish an IP-CAN session with the PCRF, and allocate an IP address to the UE;
  • the SGW-C is further configured to forward a create session response to the MME.
  • the MME is further configured to confirm a session establishment with the UE by using the base station;
  • the eNodeB is configured to transmit the TEID of the eNodeB and the IP address information of the eNodeB to the SGW-U through the MME and the SGW-C in the form of the modified bearer;
  • the UE is used for data transmission through the eNodeB, the SGW-U, and the PGW-U.
  • one SGW-C of the SGW is connected to at least one SGW-U;
  • One PGW-C of the PGW is connected to at least one PGW-U.
  • the PGW-C when the PGW-C is connected to multiple PGW-Us, the PGW-C is also used to select an appropriate PGW-U from the IP address pool corresponding to the PGW-U. An IP address is assigned to the UE.
  • the PGW-C is further configured to notify the PGW-U of the IP address to which the UE is assigned when establishing a session between the PGW-C and the PGW-U.
  • At least the IP address information of the PGW-U involved in the session to be established is included.
  • the disclosed method and smart device may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner such as: multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not executed.
  • the coupling, or direct coupling, or communication connection of the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be electrical, mechanical or other forms. of.
  • the units described above as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place or distributed to a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present disclosure may be integrated into one second processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

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Abstract

本公开文本公开了一种用户设备初始附着方法及系统，在SGW和PGW的控制面功能及转发面(用户面)功能分离的架构下。所述方法包括：MME接收到UE的附着请求后，向SGW-C发送创建会话请求；SGW-C根据所述附着请求，建立SGW-C与SGW-U之间的会话；SGW-C向PGW-C发送创建会话请求；PGW-C接收到创建会话请求后，与PCRF建立IP-CAN会话连接；PGW-C为UE分配IP地址；PGW-C建立与PGW-U之间的会话，并向SGW-C发送创建会话响应；SGW-C向MME转发创建会话响应；MME通过eNodeB与UE确认会话建立；eNodeB通过MME和SGW-C，将eNodeB的TEID和eNodeB的IP地址信息传递给SGW-U，从而打通转发面数据传输通道。

Description

用户设备初始附着方法及系统
相关申请的交叉参考
本申请主张在2015年9月30日在中国提交的中国专利申请号No.201510642358.9的优先权，其全部内容通过引用包含于此。
技术领域
本公开文本涉及通信设备附着技术，尤其涉及一种网关控制转发分离后用户设备(UE，User Equipment)初始附着的方法及系统。
背景技术
在目前长期演进(LTE，Long Term Evolution)/演进分组核心网(EPC，Evolved Packet Core)架构中，EPC网关设备中既包含路由转发功能、也包含信令处理甚至业务处理的相关功能。两类功能是紧耦合的关系，它们之间的通信取决于内部实现。网关类设备控制面与转发面之间的高度耦合，使得设备更新周期长，复合成本增加，非常不利于核心网的平滑演进。
遗憾的是，目前尚未有解决方案可供参考。
发明内容
(一)要解决的技术问题
为解决上述技术问题，本公开文本实施例提供了一种用户设备初始附着方法及系统。
(二)技术方案
在第一方面中，提供了一种用户设备初始附着方法，移动网络中服务网关SGW和分组数据网关PGW的控制面功能及转发面功能分离；所述方法包括：
移动管理单元MME接收到用户设备UE的附着请求后，向SGW的控制面SGW-C发送创建会话请求；
SGW-C根据所述附着请求，建立SGW-C与SGW的转发面SGW-U之间 的会话；
SGW-C向PGW的控制面PGW-C发送创建会话请求；
PGW-C接收到创建会话请求后，与策略与计费规则功能PCRF建立IP-CAN会话；PGW-C为用户UE分配IP地址；
PGW-C建立与PGW的转发面PGW-U之间的会话，并向SGW-C发送创建会话响应；
SGW-C向MME转发创建会话响应；
MME通过基站eNodeB与UE确认会话建立；
eNodeB以修改承载的形式，通过MME和SGW-C，向SGW-U传递eNodeB的隧道端点标识符TEID信息和eNodeB的IP地址信息；以及
UE通过eNodeB、SGW-U和PGW-U进行数据传递。
在其中一个可行的实施例中，所述一个SGW-C连接有至少一个SGW-U；并且
所述一个PGW-C连接有至少一个PGW-U。
在其中一个可行的实施例中，所述一个PGW-C连接有多个PGW-U时，所述PGW-C选择合适的PGW-U，从与该PGW-U对应的IP地址池中为所述UE分配IP地址。
在其中一个可行的实施例中，所述PGW-C建立PGW-C与PGW-U之间的会话时，将UE分配到的IP地址通知PGW-U。
在其中一个可行的实施例中，所述SGW-C向PGW-C发送的创建会话请求中，至少包含待建立会话涉及的PGW-U的IP地址信息。
在第二方面中，还提供了一种用户设备初始附着系统，所述系统包括：eNodeB、移动管理单元MME、服务网关SGW、分组数据网关PGW和策略与计费规则功能PCRF，其中，SGW和PGW的控制面功能及转发面功能分离；
MME，用于接收到用户设备UE的附着请求后，向SGW的控制面SGW-C发送创建会话请求；
SGW-C，用于根据所述附着请求，建立SGW-C与SGW的转发面SGW-U之间的会话；以及
向PGW的控制面PGW-C发送创建会话请求；
PGW-C，用于接收到创建会话请求后，与PCRF建立IP-CAN会话，并为用户UE分配IP地址；以及
建立PGW-C与PGW的转发面PGW-U之间的会话，并向SGW-C发送创建会话响应；
SGW-C，还用于向MME转发创建会话响应；
MME，还用于通过eNodeB与UE确认会话建立；
eNodeB，用于以修改承载的形式，通过MME和SGW-C，向SGW-U传递eNodeB的TEID和eNodeB的IP地址信息；
UE，用于通过eNodeB、SGW-U和PGW-U进行数据传递。
在其中一个可行的实施例中，所述一个SGW-C连接有至少一个SGW-U；并且
所述一个PGW-C连接有至少一个PGW-U。
在其中一个可行的实施例中，所述一个PGW-C连接有多个PGW-U时，所述PGW-C，还用于选择合适的PGW-U，从与该PGW-U对应的IP地址池中为所述UE分配IP地址。
在其中一个可行的实施例中，所述PGW-C，还用于在建立PGW-C与PGW-U之间的会话时，将UE分配到的IP地址通知PGW-U。
在其中一个可行的实施例中，所述SGW-C向PGW-C发送的创建会话请求中，至少包含待建立会话涉及的PGW-U的IP地址信息。
(三)有益效果
本公开文本具体实施例上述技术方案中的至少一个具有以下有益效果：
本公开文本实施例的技术方案中，MME接收到用户设备UE的附着请求后，向SGW的控制面发送创建会话请求；SGW的控制面根据所述附着请求，建立SGW的控制面与SGW的转发面之间的会话；SGW的控制面向PGW的控制面发送创建会话请求；PGW的控制面接收到创建会话请求后，与策略与计费规则功能PCRF建立IP-CAN会话；PGW的控制面为该UE分配IP地址；PGW的控制面建立PGW的控制面与PGW的转发面之间的会话，并向SGW的控制面发送创建会话响应；SGW的控制面向MME转发创建会话响应； MME通过基站与UE确认会话建立；基站通过MME和SGW的控制面，向SGW的转发面发送eNodeB的TEID和eNodeB的IP地址信息。本公开文本实施例使网关的控制面和转发面分离，简化了转发面设备功能，提高了数据转发效率。本公开文本实施例还对现有网元间接口进行最小化的改动，适应了扁平化的网络架构，更有利于网络架构的演进。
附图说明
为了更清楚地说明本公开文本实施例或现有技术中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开文本的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为根据本公开文本实施例的用户设备初始附着方法的流程示意图；
图2为根据本公开文本实施例的网关控制面转发面分离后的网络架构示意图；以及
图3为根据本公开文本实施例的用户设备初始附着方法的示意性时序图。
具体实施方式
下面结合附图和实施例，对本公开文本的具体实施方式做进一步描述。以下实施例仅用于说明本公开文本，但不用来限制本公开文本的范围。
为使本公开文本实施例的目的、技术方案和优点更加清楚，下面将结合本公开文本实施例的附图，对本公开文本实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开文本的一部分实施例，而不是全部的实施例。基于所描述的本公开文本的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开文本保护的范围。
除非另作定义，此处使用的技术术语或者科学术语应当为本公开文本所属领域内具有一般技能的人士所理解的通常意义。本公开文本专利申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”或 者“一”等类似词语也不表示数量限制，而是表示存在至少一个。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也相应地改变。
下面结合说明书附图对本公开文本实施例作进一步详细描述。应当理解，此处所描述的实施例仅用于说明和解释本公开文本，并不用于限定本公开文本。
为了能够更加详尽地了解本公开文本实施例的特点与技术内容，下面结合附图对本公开文本实施例的实现进行详细阐述，所附附图仅供参考说明之用，并非用来限定本公开文本实施例。
本公开文本实施例中，是使通信系统中的服务网关(SGW，Serving GateWay)及分组数据网关(PGW，Packet Data Network GateWay)的控制面功能与转发面功能分离。分离后的网络增加了两种接口，即SGW的控制面与转发面之间的连接接口，PGW的控制面与转发面之间的连接接口。本公开文本实施例基于这一思想，提出了相应的初始附着的相关方法。
图1为本公开文本实施例的用户设备初始附着方法的流程示意图，如图1所示，本公开文本实施例的用户设备初始附着方法包括以下步骤101至步骤109。
在步骤101中，移动管理单元(MME，Mobility Management Entity)接收到UE的附着请求后，向SGW的控制面发送创建会话请求。
本公开文本实施例中，UE首先向基站发送附着请求，基站接收到UE发送的附着请求后，向MME转发该附着请求。
MME接收到UE的附着请求后，向SGW的控制面发送创建会话请求(create session request)。
在步骤102中，SGW的控制面根据所述附着请求，建立SGW的控制面与SGW的转发面之间的会话。
SGW的控制面接收到附着请求后，在SGW的控制面与SGW的转发面之间建立会话。
在步骤103中，SGW的控制面向PGW的控制面发送创建会话请求。
SGW的控制面与SGW的转发面之间建立会话后，SGW的控制面向PGW的控制面发送创建会话请求(create session request)。
在步骤104中，PGW的控制面接收到创建会话请求后，与策略与计费规则功能(PCRF，Policy and Charging Rules Function)建立IP-CAN会话，并为该UE分配IP地址。
在步骤105中，PGW的控制面建立PGW的控制面与PGW的转发面之间的会话，并向SGW的控制面发送创建会话响应。
在步骤106中，SGW的控制面向MME转发创建会话响应。
在步骤107中，MME通过基站与UE确认会话建立。
在步骤108中，eNodeB通过MME和SGW的控制面，向SGW的转发面传递eNodeB的TEID和eNodeB的IP地址信息。
在步骤109中，UE通过eNodeB、SGW的转发面、PGW的转发面进行数据传输。
本公开文本实施例中，所述SGW的一个控制面连接有至少一个SGW的转发面；并且
所述PGW的一个控制面连接有至少一个PGW的转发面。
本公开文本实施例中，所述PGW的控制面建立PGW的控制面与PGW的转发面之间的会话时，将为UE分配到的IP地址通知PGW的转发面。
本公开文本实施例中，所述SGW的控制面向PGW的控制面发送的创建会话请求中至少包含待建立会话涉及的PGW的转发面的IP地址信息。
本公开文本实施例中，所述PGW的一个控制面连接有多个PGW的转发面时，所述PGW的控制面从相应的IP地址池中为该UE分配IP地址。
以下通过具体示例，进一步阐明本公开文本实施例的技术方案的实质。
本公开文本实施例中，将核心网中SGW、PGW网关的控制面和转发面分离，控制面处理信令流程，转发面处理数据包转发。图2为本公开文本实施例的网关控制面转发面分离后的网络架构示意图。如图2所示，将SGW与PGW的控制面和转发面分离，SGW的控制面称为SGW-C，SGW的转发面称为SGW-U，PGW的控制面称为PGW-C，PGW的转发面称为PGW-U。 SGW-C对SGW-U层面的数据转发进行统一管理，PGW-C对PGW-U层面的数据转发进行统一管理。而现有EPC网络架构中，SGW、PGW的控制面和转发面是合一设置的，没有控制面和转发面分离之说。
将控制面和转发面分离后，可以使得一个控制面设备对应多个转发面设备，便于转发面设备的扩容，增强数据转发的灵活性。如一个PGW-C可以控制多个PGW-U。在这种情况下，PGW-C上需要配置每个PGW-U相对应的IP地址池。PGW-C从相应的地址池中为UE分配地址，并建立到该PGW-U的连接通道。
PCRF下发的计费策略由PGW-C统一管理，并按需下发到PGW-U。PGW-U需要承担流量统计等与计费相关的功能，并上报到PGW-C，由PGW-C合成计费信息。
本公开文本实施例中，网络架构中新增两个接口，即SGW-C与SGW-U之间的接口，PGW-C与PGW-U之间的接口。因而，需要对现有的GPRS隧道协议(GPRS Tunnel Protocol)中的GTP控制面GTP-C的相关流程进行扩展，以实现SGW-C对转发面设备SGW-U的控制，PGW-C对转发面设备PGW-U的控制。
本公开文本实施例中，尽量保持网络中其他网元设备接口和协议不变。
图3为本公开文本实施例的用户设备初始附着方法的示意时序图。如图3所示，当核心网网关控制面与转发面分离后，用户初始附着流程包括以下的步骤1至步骤15。
在步骤1中，eNodeB向MME发送attach request。
基站eNodeB接收到UE发送的attach request后，向MME转发该attach request。
在步骤2中，MME向SGW-C发送create session request。该消息中包含但不限于：MME控制面的隧道端点标识符(TEID，Tunnel Endpoint Identifier)(MME TEID for control plane)，SGW-U地址(SGW-U address)，PGW-C地址(PGW-C address)，PGW-U地址(PGW-U address)，PDN地址(PDN Address)。
在步骤3中，SGW-C与SGW-U建立控制面与转发面之间的会话(create  session between CU)。其中SGW-C向SGW-U发送的消息中包含但不限于：SGW-C TEID，PGW-U address等(不需要包含PGW-C address)。SGW-U向SGW-C回复的消息中包含但不限于：SGW-U TEID。
在步骤4中，SGW-C向PGW-C发送create session request。该消息中包含但不限于：PGW-U address，SGW-U address，SGW-U TEID，SGW-C TEID，PDN Address。
在步骤5中，PGW-C与PCRF建立IP-CAN。PGW-C向该UE的PDN连接分配IP地址。PGW-C向PCRF提供UE IP address，Default EPS Bearer QoS，并获取APN-AMBR、QCI、ARP等计费策略信息和QoS信息。
当PGW-C对应多个PGW-U时，PGW-C根据PGW-U的地址，从相应的IP地址池为该UE分配地址。
在步骤6中，PGW-C与PGW-U建立create session between CU。其中PGW-C向PGW-U发送的信息包括但不限于：SGW-U address，SGW-U TEID，PGW-C TEID，PDNAddress(包含UE的IP地址)等信息。PGW-U向PGW-C回复的信息包括但不限于：PGW-U TEID。
在步骤7中，PGW-C向SGW-C发送create session response。该信息包括但不限于：PGW-U address，PGW-U TEID，PGW-C TEID，PDN Address(包含UE的IP地址)。
在步骤8中，SGW-C向MME发送create session response。该信息包括但不限于：PDN Address(包含UE的IP地址)，SGW-U address，SGW-U TEID，SGW-C TEID，PGW-C address，PGW-C TEID，PGW-U address，PGW-U TEID。
在步骤9中，MME向eNodeB发送initial context setup request/attach accept。该消息包括但不限于：SGW-U address，SGW-U TEID，SGW-C TEID，SGW-C address，PDN Address(包含UE的IP地址)。
在步骤10中，eNodeB向MME发送initial context response message/attach complete message。该消息包括但不限于：eNodeB TEID、eNodeB address。
在步骤11中，MME向SGW-C发送modify bearer request。该消息包括但不限于：eNodeB address，eNodeB TEID。
在步骤12中，SGW-C向SGW-U发送modify bearer between CU。该消 息包括但不限于：eNodeB address，eNodeB TEID。
在步骤13中，SGW-C向MME发送modify bearer response。
在步骤14中，UE通过eNodeB向SGW-U和PGW-U发送上行数据包。
在步骤15中，下行数据包从PGW-U经过SGW-U和eNodeB到达UE。
如图3所示，本公开文本实施例的初始附着系统包括：eNodeB、MME、SGW、PGW和PCRF，其中，SGW和PGW的控制面功能及转发面功能分离。具体地，SGW的控制面称为SGW-C，SGW的转发面称为SGW-U，PGW的控制面称为PGW-C，PGW的转发面称为PGW-U。
MME，用于接收到UE的附着请求后，向SGW-C发送创建会话请求；
SGW-C，用于根据所述附着请求，建立SGW-C与SGW-U之间的会话；以及
向PGW-C发送创建会话请求；
PGW-C，用于接收到创建会话请求后，与PCRF建立IP-CAN会话，并为该UE分配IP地址；以及
建立PGW-C与PGW-U之间的会话，并向SGW-C发送创建会话响应；
SGW-C，还用于向MME转发创建会话响应；
MME，还用于通过基站与UE确认会话建立；
eNodeB，用于以修改承载的形式，通过MME和SGW-C，向SGW-U传递eNodeB的TEID和eNodeB的IP地址信息；以及
UE，用于通过eNodeB、SGW-U和PGW-U进行数据传递。
本公开文本实施例中，所述SGW的一个SGW-C连接有至少一个SGW-U；并且
所述PGW的一个PGW-C连接有至少一个PGW-U。
本公开文本实施例中，所述一个PGW-C连接有多个PGW-U时，所述PGW-C，还用于选择合适的PGW-U，从与该PGW-U对应的IP地址池中为所述UE分配IP地址。
本公开文本实施例中，所述PGW-C，还用于在建立PGW-C与PGW-U之间的会话时，将UE分配到的IP地址通知PGW-U。
本公开文本实施例中，所述SGW-C向PGW-C发送的创建会话请求中， 至少包含待建立会话涉及的PGW-U的IP地址信息。
本领域技术人员应当理解，本公开文本实施例的初始附着系统中各网元所实现的功能可参照前述各实施例的初始附着方法的相关描述而理解。除SGW、PGW之外，其他网元的结构与现有系统中的对应网元的结构完全相同。
本公开文本实施例所记载的技术方案之间，在不冲突的情况下，可以任意组合。
在本公开文本所提供的几个实施例中，应该理解到，所揭露的方法和智能设备，可以通过其它的方式实现。以上所描述的设备实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，如：多个单元或组件可以结合，或可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的各组成部分相互之间的耦合、或直接耦合、或通信连接可以是通过一些接口，设备或单元的间接耦合或通信连接，可以是电性的、机械的或其它形式的。
上述作为分离部件说明的单元可以是、或也可以不是物理上分开的，作为单元显示的部件可以是、或也可以不是物理单元，即可以位于一个地方，也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或全部单元来实现本实施例方案的目的。
另外，在本公开文本各实施例中的各功能单元可以全部集成在一个第二处理单元中，也可以是各单元分别单独作为一个单元，也可以两个或两个以上单元集成在一个单元中；上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
以上所述，仅为本公开文本的具体实施方式，但本公开文本的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本公开文本揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开文本的保护范围之内。

Claims (10)

  1. 一种用户设备初始附着方法，移动网络中服务网关SGW和分组数据网关PGW的控制面功能及转发面功能分离；所述方法包括：
    移动管理单元MME接收到用户设备UE的附着请求后，向SGW的控制面SGW-C发送创建会话请求；
    SGW-C根据所述附着请求，建立SGW-C与SGW的转发面SGW-U之间的会话；
    SGW-C向PGW的控制面PGW-C发送创建会话请求；
    PGW-C接收到创建会话请求后，与策略与计费规则功能PCRF建立IP-CAN会话；PGW-C为用户UE分配IP地址；
    PGW-C建立与PGW的转发面PGW-U之间的会话，并向SGW-C发送创建会话响应；
    SGW-C向MME转发创建会话响应；
    MME通过基站eNodeB与UE确认会话建立；
    eNodeB以修改承载的形式，通过MME和SGW-C，向SGW-U传递eNodeB的隧道端点标识符TEID信息和eNodeB的IP地址信息；以及
    UE通过eNodeB、SGW-U和PGW-U进行数据传递。
  2. 根据权利要求1所述的用户设备初始附着方法，其中，所述一个SGW-C连接有至少一个SGW-U；并且
    所述一个PGW-C连接有至少一个PGW-U。
  3. 根据权利要求1或2所述的用户设备初始附着方法，其中，所述一个PGW-C连接有多个PGW-U时，所述PGW-C选择合适的PGW-U，从与该PGW-U对应的IP地址池中为所述UE分配IP地址。
  4. 根据权利要求1至3中任一项所述的用户设备初始附着方法，其中，所述PGW-C建立PGW-C与PGW-U之间的会话时，将UE分配到的IP地址通知PGW-U。
  5. 根据权利要求1至4中任一项所述的用户设备初始附着方法，其中，所述SGW-C向PGW-C发送的创建会话请求中，至少包含待建立会话涉及的 PGW-U的IP地址信息。
  6. 一种用户设备初始附着系统，所述系统包括：eNodeB、移动管理单元MME、服务网关SGW、分组数据网关PGW和策略与计费规则功能PCRF，其中，SGW和PGW的控制面功能及转发面功能分离；
    MME，用于接收到用户设备UE的附着请求后，向SGW的控制面SGW-C发送创建会话请求；
    SGW-C，用于根据所述附着请求，建立SGW-C与SGW的转发面SGW-U之间的会话；以及
    向PGW的控制面PGW-C发送创建会话请求；
    PGW-C，用于接收到创建会话请求后，与PCRF建立IP-CAN会话，并为用户UE分配IP地址；以及
    建立PGW-C与PGW的转发面PGW-U之间的会话，并向SGW-C发送创建会话响应；
    SGW-C，还用于向MME转发创建会话响应；
    MME，还用于通过eNodeB与UE确认会话建立；
    eNodeB，用于以修改承载的形式，通过MME和SGW-C，向SGW-U传递eNodeB的TEID和eNodeB的IP地址信息；
    UE，用于通过eNodeB、SGW-U和PGW-U进行数据传递。
  7. 根据权利要求6所述的用户设备初始附着系统，其中，所述一个SGW-C连接有至少一个SGW-U；并且
    所述一个PGW-C连接有至少一个PGW-U。
  8. 根据权利要求6或7所述的用户设备初始附着系统，其中，所述一个PGW-C连接有多个PGW-U时，所述PGW-C，还用于选择合适的PGW-U，从与该PGW-U对应的IP地址池中为所述UE分配IP地址。
  9. 根据权利要求6至8中任一项所述的用户设备初始附着系统，其中，所述PGW-C，还用于在建立PGW-C与PGW-U之间的会话时，将UE分配到的IP地址通知PGW-U。
  10. 根据权利要求6至9中任一项所述的用户设备初始附着系统，其中，所述SGW-C向PGW-C发送的创建会话请求中，至少包含待建立会话涉及的 PGW-U的IP地址信息。
PCT/CN2016/097651 2015-09-30 2016-08-31 用户设备初始附着方法及系统 Ceased WO2017054611A1 (zh)

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