WO2011157100A1 - 一种数据缓存的方法和系统 - Google Patents

一种数据缓存的方法和系统 Download PDF

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Publication number
WO2011157100A1
WO2011157100A1 PCT/CN2011/074602 CN2011074602W WO2011157100A1 WO 2011157100 A1 WO2011157100 A1 WO 2011157100A1 CN 2011074602 W CN2011074602 W CN 2011074602W WO 2011157100 A1 WO2011157100 A1 WO 2011157100A1
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Prior art keywords
network element
side network
base station
radio side
data caching
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PCT/CN2011/074602
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English (en)
French (fr)
Inventor
梁爽
周娜
王静
霍玉臻
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中兴通讯股份有限公司
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Publication of WO2011157100A1 publication Critical patent/WO2011157100A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/02Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/50Network services
    • H04L67/56Provisioning of proxy services
    • H04L67/568Storing data temporarily at an intermediate stage, e.g. caching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16Gateway arrangements

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method and system for data caching. Background technique
  • the third generation partner program The (3GPP, 3rd Generation Partnership Project) standard working group is working on the Evolved Packet System (EPS).
  • the structure of the EPS is shown in Figure 1.
  • the entire EPS is divided into two parts: the radio access network and the core network.
  • the home subscriber server HSS, Home Subscriber Server
  • MME Mobility Management
  • HSS is the permanent storage location for user subscription data, located in the home network that the user subscribes to.
  • MME is the location where the subscriber subscription data is stored in the current network, responsible for UE-to-network non-access stratum signaling management, UE security verification, UE mobility management, user idle mode tracking and paging management, and bearer management. ;
  • the SGSN is a service support point for GERAN (GSM EDGE Radio Access Network) and Global Terrestrial Radio Access (UTRAN) users to access the core network. It is similar to the MME in function, and is responsible for user location update, paging management, and Bearer management
  • the S-GW is a gateway of the core network to the wireless system, and is responsible for the user plane bearer of the UE to the core network, the data buffer in the UE idle mode, the function of initiating a service request by the network side, the lawful interception, and the packet data routing and forwarding function;
  • the GW is responsible for counting the use of the wireless network by the user equipment (UE, User Equipment), and generating the CDRs of the UE using the wireless network, and transmitting the CDRs to the charging gateway;
  • the P-GW is a gateway of the evolved system and the external packet data network of the system. It is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP) address allocation, charging function, packet filtering, and policy control of the UE. Other functions;
  • IP Internet Protocol
  • the PDN is an operator's IP service network, which provides IP services to users through the carrier's core network;
  • the PCRF is a server in the evolution system responsible for providing rules for charging control, online credit control, threshold control, and quality of service (QoS) policies;
  • the radio access network is composed of an evolved base station (eNB, E-NodeB) and a radio network controller (Radio Network Control), which is mainly responsible for transmitting and receiving wireless signals, and communicating with the UE through the air interface. Radio resources, resource scheduling, and access control over the air interface.
  • eNB evolved base station
  • E-NodeB evolved base station
  • Radio Network Control Radio Network Control
  • the above SGSN is an upgraded SGSN, which can support the S4 interface with the S-GW, and interwork with the GPRS channel protocol (GTPv2, GPRS Tunnelling Protocol).
  • GTPv2 GPRS Tunnelling Protocol
  • the packet switching (PS, Packet Switching) domain network architecture is different from that of Figure 1.
  • the SGSN and the MME are connected by the Gn interface, and the GTPvl protocol is used for interworking.
  • the SGSN cannot connect to the S-GW, and connects to the gateway GPRS support node (GGSN, Gateway GPRS Support Node) through the Gn interface to directly access the PDN.
  • GGSN Gateway GPRS Support Node
  • a home base station (HNB, Home NodeB) or an evolved home base station (HeNB, Home eNodeB) is a type of small, low-power base station that is deployed as a dedicated resource for certain users and deployed in private places such as homes, groups, companies, or schools. , mainly to provide users with higher The service rate and the cost of using high-rate services, while making up for the lack of coverage of existing distributed cellular wireless communication systems.
  • the advantages of home base stations are affordability, convenience, low power output, plug and play, broadband access, use of single mode terminals, and more.
  • the home base station can be applied in a 3G or Long Term Evolution (LTE) mobile communication network.
  • a new network element that is, a home base station gateway, is introduced in the network.
  • the main functions of the home base station gateway are: verifying the security of the home base station, performing maintenance and management on the operation of the home base station, configuring and controlling the home base station according to the operator's requirements, and exchanging data information of the core network and the home base station.
  • Figure 2 shows a 3G home base station network architecture diagram.
  • the 3G home base station is connected to the home base station gateway through a newly defined Iuh interface, and the home base station gateway provides IuPS and IuCs interfaces to the core network packet domain and circuit domain.
  • the home base station gateway is mandatory to shield the impact on the UE and the network side after the home base station is introduced.
  • the home base station gateway can be deployed. Therefore, the LTE home base station and the core network are connected in two ways. One is that the home base station and the core network element are directly connected, and the other is the home base station through the home base station gateway and the core. The network elements are connected, as shown in Figure 3 and Figure 4, respectively.
  • the home base station gateway may not integrate the user plane function, and the user plane is directly established between the home base station and the core network user plane gateway, so that the user plane is flattened and the data transmission delay is reduced. , as shown in Figure 5.
  • the home base station can also support local IP access functions. Under the condition that the home base station has local IP access capability and the user subscribes to allow local IP access, the user can implement the user to the home network. Local access to IP devices or the Internet. Through the local access function, the Internet data service can be offloaded, the core network load can be reduced, and the access to the home network device can be forwarded without the core network, and the data transmission is convenient and efficient.
  • the local IP access function can also be used on the macro cell. The main purpose is similar to that of the home base station. More is the application of the local IP access to the Internet. The purpose is to reduce the core network load.
  • the local access gateway serves as a network element that locally accesses an external network (such as the internet), and provides address allocation, charging, packet filtering, policy control, data offloading, and NAS/radio access network.
  • Application part RANAP, Radios Access Network Application Part
  • message parsing NAT
  • NAT network address translation
  • the L-GW can be deployed as an independent network element or in conjunction with an existing home base station or home base station gateway.
  • the macrocell to implement the local access architecture, or the access architecture without the home base station gateway, it can be implemented by the architecture of FIG.
  • the local gateway and the base station/home base station may be third party owners belonging to non-mobile operators such as enterprises or homes. Therefore, in order to ensure the data privacy of the local connection, local connection data should be avoided to return to the mobile operator's core network.
  • the base station/home base station can directly exchange related information through the extended interface, thereby eliminating the need to modify the gateway of the core network to reduce the network. Upgrade cost.
  • FIG. 8 a process of extending an interface and establishing a local connection through LTE access is as shown in FIG. 8, which mainly includes the following steps:
  • Step 801 When the UE is powered on, initiate an attach procedure (attach request) to register in the core network.
  • the non-access stratum message is sent to the MME by the base station (HeNB/eNB) encapsulated in the initial user message of the S1 interface, and the base station also informs the core network of its ability to support local IP access (LIPA, Local IP Access).
  • LIPA Local IP Access
  • the attach request also includes information that the UE wants to establish a local connection, including but not limited to a special access point name (APN, Access Point Name), or establishing a local connection indication.
  • APN Access Point Name
  • Step 802 If there is no context information of the user in the network, or the attachment request message has no integrity protection, or the integrity protection fails, the MME performs an authentication and authentication process for the user, that is, security/authentication/authorization verification.
  • Steps 803 to 804 If the UE establishes the local connection information provided in the attach request, or the protocol configuration option (PCO, Protocol Configuration Options) provided by the UE is encrypted, the MME obtains the request message by receiving the encrypted information and receives the encryption. The information gets a response message to reacquire the parameters.
  • PCO Protocol Configuration Options
  • Step 805 If there is no subscription data of the user in the MME, send an update location request message (location update) to the HSS, and request to obtain the subscription data of the UE (accounting data acquisition).
  • location update location update
  • Steps 806-807 the MME establishes a corresponding PDN connection for the UE according to the request of the UE and the subscription data of the HSS.
  • the MME sends a Create Session Request message to the L-GW through the S-GW, which carries the UE identifier and the signed QoS information.
  • the L-GW returns a Create Session Response to the S-GW, which carries information such as the assigned tunnel end identifier and address.
  • Step 808 The MME determines, according to the information provided by the UE, that is, the APN in the attach request message, and the subscription information or the policy information, that is, the policy information of the local or the O-M configuration, whether the local connection is established for the UE. Does not establish a core network bearer). If the result of the determination is yes, it is determined to establish a local connection for the UE, and then perform the subsequent steps.
  • Step 809 The MME sends an initial context setup request message to the base station/home base station, and includes related information that allows local access and local access establishment for the UE, where the related information includes but is not limited to the APN and the MME allocates the UE.
  • Globally Unique Temporary Identity (GUTI), or tunnel-side identification and address information of the L-GW.
  • the request also includes an attach accept message sent to the UE.
  • Step 810 The base station/home base station sends a create session request to the L-GW, where the tunnel end identifier of the base station/home base station, the identifier information of the UE, or the tunnel end identifier information allocated by the L-GW is carried.
  • Step 811 The L-GW binds the relationship between the bearer established by the base station and the bearer previously established by the S-GW according to the UE identifier information in the Create Session Request message or the tunnel end identifier information allocated by the L-GW.
  • Step 812 The HeNB sends an RRC setup request message to the UE, and includes an attach in the UE. Subject to the news.
  • Step 813 The UE establishes an RRC, and returns an RRC setup complete message to the HeNB.
  • Step 814 The HeNB returns an initial context setup response message to the MME.
  • Step 815 The UE sends a direct transmission message to the HeNB, where the attachment complete message is included.
  • Step 816 The HeNB sends an attach complete message to the MME by using a direct transmission message.
  • Steps 810 to 811 in the above process may be performed after step 809, or step 813, or step 815.
  • the source base station/home base station caches the data. If data forwarding is not supported between the base station/home base station, the data needs to be forwarded through the core network, so the privacy of the local connection data is affected. In addition, due to the cost of the home base station itself, its data caching capabilities are also limited. Summary of the invention
  • the present invention provides a method of data caching, the method comprising:
  • the source radio side network element notifies the local gateway (L-GW) to perform data caching;
  • the L-GW After the handover is completed, the L-GW sends the buffered data to the UE through the switched target radio side network element.
  • the source radio side network element notifies the L-GW to perform data caching through the added message type, or notifies the L-GW to perform data caching through the extended modify bearer request message or the release access request message.
  • the source radio side network element Notify the L-GW to perform data caching, specifically:
  • the source network side After the source radio side network element initiates the handover procedure, the source network side notifies the L-GW to perform data caching; or the source radio side network element notifies the L-GW to perform data caching after determining that the local connection is successfully established.
  • the method further includes:
  • the source radio side network element Transmitting, by the source radio side network element, the tunnel end identifier and/or address information of the L-GW to the target radio side network element, where the target radio side network element is based on the tunnel allocated by the L-GW
  • the end identifier and/or address information is bearer association.
  • the method further includes:
  • the target mobility management unit sends the tunnel end identifier and/or the address information of the L-GW to the target radio side network element, where the target radio side network element is located at the tunnel end identifier and/or address information allocated by the L-GW. Perform bearer association.
  • the present invention also provides a system for data caching, the system includes: a source radio side network element where the UE is located, and an L-GW, where
  • the source radio side network element is configured to notify the L-GW to perform data caching in a handover process caused by a UE location movement.
  • the L-GW is configured to cache data according to the notification of the source radio side network element, and after the handover is completed, send the buffered data to the UE by using the switched target radio side network element.
  • the source radio side network element is further configured to notify the L-GW to perform data caching through the added message type, or notify the L-GW to perform data caching through the extended modify bearer request message or the release access request message.
  • the source radio side network element is further configured to: after initiating the handover process, notify the L-GW to perform data caching;
  • the L-GW is notified to perform data caching.
  • the source radio side network element is further configured to: identify a tunnel end identifier and/or address of the L-GW Sending information to the target wireless side network element;
  • the target radio side network element performs bearer association according to the tunnel end identifier and/or address information of the L-GW.
  • the system further includes: a target mobility management unit, configured to send the tunnel end identifier and/or address information of the L-GW to the target radio side network element;
  • the target radio side network element performs bearer association according to the tunnel end identifier and/or address information of the L-GW.
  • the method and system for data buffering provided by the present invention, in the handover process caused by the movement of the UE location, the source radio side network element notifies the L-GW to perform data caching; after the handover is completed, the L-GW will cache the data.
  • the target radio side network element is delivered to the UE.
  • the invention can effectively avoid the problem of data privacy brought back to the core network by the local network, and can also reduce the cost increase of the base station/home base station, especially the home base station data buffer. This protects the privacy of local data and also reduces the cost of base station/home base stations, especially home base stations.
  • FIG. 1 is a schematic structural view of an EPS in the prior art
  • FIG. 2 is a schematic structural diagram of a 3G home base station network in the prior art
  • FIG. 3 is a schematic structural diagram 1 of an LTE home base station network in the prior art
  • FIG. 4 is a schematic structural diagram 2 of an LTE home base station network in the prior art
  • FIG. 5 is a schematic structural diagram 3 of an LTE home base station network in the prior art
  • FIG. 6 is a schematic diagram 1 of a network architecture for implementing local access in the prior art
  • FIG. 7 is a schematic diagram 2 of a network architecture for implementing local access in the prior art
  • Embodiment 9 is a flowchart of a method for data caching in Embodiment 1 of the present invention.
  • FIG. 10 is a flowchart of a method for data buffering according to Embodiment 2 of the present invention. detailed description
  • a data caching method provided by the present invention mainly includes: in a handover procedure caused by a UE location movement, the source radio side network element notifies the L-GW to perform data caching; after the handover is completed, the L-GW will cache the data.
  • the target radio side network element is delivered to the UE.
  • the L-GW replaces the wireless side network element to perform data cache processing, which is to avoid the data privacy problem brought by the local data back to the core network, and to reduce the data privacy problem.
  • the cost of the wireless side network metadata cache is increased.
  • Figure 9 is a first embodiment of implementing notification data caching using the present invention.
  • This embodiment does not limit the type of base station, that is, a home base station or a normal base station.
  • the home base station is taken as an example, and the impact on the common base station is the same.
  • This embodiment can be applied to the case of LTE access or UTRAN/GERAN access.
  • the home base station/base station is the HeNB/eNB, and the mobility management unit is the MME.
  • the UTRAN/GERAN access The home base station/base station is an HNB/Radio Network Controller (RNC), and the mobility management unit is an SGSN.
  • RNC Radio Network Controller
  • the core network gateway refers to the GGSN/S-GW/P-GW located in the core network.
  • the home base station there may be a home base station gateway in the network. If there is a home base station gateway, all the messages between the home base station and the mobility management unit need to pass through the home base station gateway. Further, the message between the home base station and the L-GW may pass through the home base station gateway or not through the home base station gateway.
  • the home base station gateway transparently transmits the passed message.
  • This embodiment is also applicable to the S-GW change scenario.
  • the present invention does not describe the message or process change caused by the S-GW change, and therefore is not described herein.
  • the handover process mainly includes the following steps:
  • Step 901 The source home base station initiates a handover procedure, and requests the UE to report the measurement report.
  • Step 902 The source home base station sends a data cache notification message to the L-GW, where the bearer list that needs to be cached, or the identifier information of the PDN connection, or the cache indication is carried.
  • the present invention does not limit the specific implementation manner of the notification message, and may be implemented by adding a new message type. It may also be implemented by extending an existing modification bearer request message or releasing an access request message.
  • Step 903 After receiving the data cache notification message, the L-GW locally caches the data of the related bearer, that is, no longer sends data to the source home base station.
  • Step 904 After selecting the target home base station, the source home base station sends a handover request message to the source mobility management unit, where the target home base station identifier or the target cell identifier, the target tracking area or the routing area identifier, the bearer identifier of the UE, and the source home are included.
  • the base station needs to transmit information such as a container to the target home base station.
  • the container information may include a tunnel end identifier allocated by the L-GW.
  • Step 905 The source mobility management unit sends a forwarding relocation request message to the target mobility management unit, where the context information of the UE is carried.
  • the context information also needs to include information such as an address of the S-GW and a tunnel end identifier, and an address of the L-GW and/or a tunnel end identifier.
  • Step 906 The target mobility management unit determines whether it is necessary to reselect the S-GW. In this embodiment, it is determined that it is unnecessary.
  • the target mobility management unit sends a handover request to the target home base station, where the address of the S-GW and the tunnel end identifier, and the address information of the L-GW and/or the tunnel end identifier are given to the target base station.
  • the address and/or the tunnel end identifier of the L-GW is mainly used for the bearer association of the target home base station, and is included in the container information sent by the source home base station to the target home base station, and/or included in the target mobile management unit and sent to the target home station. In the handover request of the base station.
  • Step 907 The target home base station returns a handover request response message to the target mobility management unit.
  • the bearer information that is successfully established and the bearer information that fails to be established are carried, and the container information returned by the target home base station to the source home base station.
  • Step 908 The target mobility management unit returns a forwarding relocation response message to the source mobility management unit, where the bearer information and the bearer information that fails to be established are carried, and the container information returned by the target home base station to the source home base station.
  • Step 909 The source mobility management unit returns a handover command to the source home base station, where the bearer information of the work setup and the bearer information that fails to be established, and the container information returned by the target home base station to the source home base station.
  • Step 910 The source home base station sends a handover command information to the UE to notify the UE to perform path switching.
  • Step 913 The target mobility management unit sends a modify bearer request to the S-GW, where the user plane address and the tunnel end identifier of the target base station are carried. If the location information needs to be reported, the S-GW also needs to send a modify bearer request to the L-GW.
  • Step 914 The L-GW returns a modify bearer response to the S-GW, and the S-GW returns a modify bearer response to the target mobility management unit.
  • Step 915 The target home base station sends a modify bearer request to the L-GW, where the address of the L-GW and the tunnel end identifier, and the address of the target home base station and the tunnel end identifier are carried.
  • Step 916 The L-GW switches the data routing path, and sends data through the updated route.
  • the updated routing path is: UE target home base station L-GW.
  • Step 917 The L-GW sends a modify bearer response message to the target home base station.
  • steps 915-917 are performed after step 91 1 .
  • This embodiment is also applicable to a scenario in which the mobility management unit has not changed. If the mobility management unit has not changed, Then, the source mobility management unit and the target mobility management unit are the same network element, and signaling of interaction between all source mobility management units and the target mobility management unit may be omitted.
  • FIG. 10 is a second embodiment of implementing notification data caching using the present invention.
  • This embodiment does not limit the type of base station, that is, a home base station or a normal base station.
  • the home base station is taken as an example, and the impact on the common base station is the same.
  • This embodiment can be applied to the case of LTE access or UTRAN/GERAN access.
  • the home base station/base station is the HeNB/eNB
  • the mobility management unit is the MME.
  • the UTRAN/GERAN access The home base station/base station is an HNB/RNC, and the mobility management unit is an SGSN.
  • the core network gateway refers to the GGSN/SGW/PGW located in the core network.
  • the home base station there may be a home base station gateway in the network. If there is a home base station gateway, all the messages between the home base station and the mobility management unit need to pass through the home base station gateway. Further, the message between the home base station and the L-GW may be through the home base station gateway or not through the home base station gateway. For the scenario in which the message is forwarded through the home base station gateway, the home base station gateway transparently transmits the passed message.
  • the process of switching mainly includes the following steps:
  • Step 1001 The source home base station initiates a handover procedure, and requests the UE to report the measurement report.
  • the processes performed in steps 1002 to 1007 are similar to the steps 904 to 909 in the first embodiment, and the description will not be repeated here.
  • Step 1008 The source home base station determines whether the local connection is successfully established, and sends a data cache notification message to the L-GW when the establishment is successful, and carries the bearer list that needs to be cached, or the identifier information of the PDN connection, or the cache indication.
  • the present invention does not limit the specific implementation manner of the notification message, and may add a new message class.
  • the type is implemented; it can also be implemented by extending an existing modification bearer request message or releasing an access request message.
  • Step 1009 After receiving the data cache notification message, the L-GW locally caches the data of the related bearer, that is, no longer sends data to the source home base station.
  • steps 1010 to 1017 is similar to the steps 910 to 917 in the first embodiment, and details are not described herein again. view. If the mobility management unit does not change, the source mobility management unit and the target mobility management unit are the same network element, and signaling of interaction between all source mobility management units and the target mobility management unit may be omitted.
  • the present invention further provides a system for data caching, including: a source radio side network element where the UE is located, and an L-GW.
  • the source radio side network element is configured to notify the L-GW to perform data caching in the handover process caused by the movement of the UE location, and the L-GW is configured to cache data according to the notification of the source radio side network element, and complete the handover. After that, the buffered data is sent to the UE through the switched new path.
  • the source radio side network element may notify the L-GW to perform data caching through the added message type, or may notify the L-GW to perform data caching through the extended modify bearer request message or the release access request message.
  • the source radio side network element may notify the L-GW to perform data caching after initiating the handover procedure. After determining that the local connection establishment is successful, the L-GW may be notified to perform data caching.
  • the source radio side network element or the target mobility management unit needs to send the tunnel end identifier and/or address information allocated by the L-GW to the target side network element, so that the target radio side network element can be based on the L-
  • the tunnel end identifier and/or address information allocated by the GW is bearer association.

Abstract

本发明公开了一种数据缓存的方法,包括:在用户终端(UE)位置发生移动引起的切换流程中,源无线侧网元通知本地网关(L-GW)进行数据缓存;在切换完成后,L-GW将缓存的数据通过切换后的目标无线侧网元下发给UE。本发明还公开了一种数据缓存的系统。通过本发明的方法和系统,保护了本地数据的私密性,并降低了基站/家用基站,尤其是家用基站的成本。

Description

一种数据緩存的方法和系统 技术领域
本发明涉及移动通信领域, 尤其涉及一种数据緩存的方法和系统。 背景技术
为了保持第三代移动通信系统在通信领域的竟争力, 为用户提供速率 更快、 时延更低、 更加个性化的移动通信服务, 同时降低运营商的运营成 本, 第三代合作伙伴计划 (3GPP, 3rd Generation Partnership Project )标准 工作组正致力于演进分组系统(EPS, Evolved Packet System )的研究。 EPS 的结构如图 1所示, 整个 EPS分为无线接入网和核心网两部分, 在核心网 中, 包含了归属用户服务器(HSS , Home Subscriber Server ), 移动性管理 实体( MME, Mobility Management Entity )、服务通用分组无线服务 ( GPRS, General Packet Radio Service ) 支持节点 (SGSN, Serving GPRS Support Node )、策略计费规则功能实体( PCRF, Policy and Charging Rule Function )、 服务网关( S-GW, Serving Gateway )、分组数据网关( P-GW, PDN Gateway ) 和分组数据网络(PDN, Packet Data Network )„ 下面详细介绍各部分功能: HSS是用户签约数据的永久存放地点, 位于用户签约的归属网; MME是用户签约数据在当前网络的存放地点, 负责 UE到网络的非接 入层信令管理、 UE的安全验证、 UE的移动性管理、 用户空闲模式下的跟 踪和寻呼管理、 承载管理;
SGSN是 GERAN ( GSM EDGE Radio Access Network )和全球陆地无 线接入 ( UTRAN , Universal Terrestrial Radio Access )用户接入核心网的业 务支持点, 功能上与 MME类似, 负责用户的位置更新、寻呼管理和承载管 理; S-GW是核心网到无线系统的网关, 负责 UE到核心网的用户面承载、 UE空闲模式下的数据緩存、 网络侧发起业务请求的功能、 合法监听和分组 数据路由和转发功能; S-GW负责统计用户终端( UE, User Equipment )使 用无线网的情况, 并产生 UE使用无线网的话单, 传送给计费网关;
P-GW是演进系统和该系统外部分组数据网络的网关,它连接到因特网 和分组数据网络上, 负责 UE的互联网协议( IP , Internet Protocol )地址分 配、 计费功能、 分组包过滤、 策略控制等功能;
PDN是运营商的 IP业务网络,该网络通过运营商的核心网为用户提供 IP服务;
PCRF是演进系统中负责提供计费控制、 在线信用控制、 门限控制、 服 务质量(QoS, Quality of Service ) 策略方面规则的服务器;
无线接入网 (RAN, Radio Access Network ) 是由演进基站 (eNB , E-NodeB )和无线网络控制器 ( Radio Network Control )组成, 它主要负责 无线信号的收发, 通过空中接口和 UE联系, 管理空中接口的无线资源、 资 源调度、 接入控制。
上述 SGSN是升级过的 SGSN, 能够支持与 S-GW之间的 S4接口, 并 与 ΜΜΕ之间釆用 GPRS信道协议( GTPv2, GPRS Tunnelling Protocol )进 行互通。 而对于支持 3G核心网的 SGSN 来说, 分组交换(PS , Packet Switching )域网络架构与图 1有所不同。 此时, SGSN与 MME釆用 Gn接 口相连, 互通釆用 GTPvl协议。 SGSN不能与 S-GW相连, 通过 Gn接口 连接到网关 GPRS支持节点( GGSN, Gateway GPRS Support Node )直接进 行 PDN访问。
家庭基站(HNB, Home NodeB )或者演进的家庭基站(HeNB, Home eNodeB )是一类小型、 低功率的基站, 作为某些用户的专属资源, 部署在 家庭、 团体、 公司或者学校等私人场所使用, 主要是为了给用户提供更高 的业务速率并降低使用高速率服务所需要的费用, 同时弥补已有分布式蜂 窝无线通信系统覆盖的不足。 家庭基站的优点是实惠、 便捷、 低功率输出、 即插即用、 宽带接入、 使用单模终端等。
家庭基站可以应用在 3G或者长期演进 ( LTE, Long Term Evolution ) 移动通信网络中。 为了便于对家庭基站进行管理, 在网络中引入了一个新 网元, 即家庭基站网关。 家庭基站网关主要执行的功能为: 验证家庭基站 的安全性, 对家庭基站的运行进行维护管理, 根据运营商要求配置和控制 家庭基站, 负责交换核心网和家庭基站的数据信息。 图 2示出了 3G家庭基 站网络架构图, 3G家庭基站通过新定义的 Iuh接口连接至家庭基站网关, 家庭基站网关提供到核心网分组域和电路域的 IuPS和 IuCs接口。 对于 3G 网络来说家庭基站网关为必选部署,用来屏蔽引入家庭基站后对 UE和网络 侧的影响。 对于 LTE网络来说家庭基站网关可选部署, 因此 LTE家庭基站 和核心网连接有两种方式, 一种是家庭基站和核心网网元直接相连, 另一 种是家庭基站通过家庭基站网关和核心网网元相连,分别如图 3、图 4所示。 对于图 4所示引入家庭基站网关的场景, 家庭基站网关可以不集成用户面 功能, 家庭基站和核心网用户面网关间直接建立用户面, 这样可以使用户 面扁平化, 数据传输时延减小, 如图 5所示。
家庭基站除了支持通过移动核心网络的接入之外, 还可以支持本地 IP 接入功能,在家庭基站具备本地 IP接入能力并且用户签约允许本地 IP访问 的条件下,可以实现用户对家庭网络其他 IP设备或者互联网络的本地接入。 通过本地接入功能, 可以实现 Internet数据业务的分流, 降低核心网负荷, 并且对于家庭网络设备的访问可以不通过核心网来进行转发, 数据传输便 捷高效。 本地 IP接入功能在宏蜂窝上也可以使用, 主要用途和家庭基站类 似, 更多的是应用在本地 IP接入 Internet这种场景, 目的是降低核心网负 荷。 图 6和图 7分别示出了实现上述本地接入功能的架构, 主要差别体现 在是否存在家庭基站网关。 其中, 本地接入网关(L-GW )作为本地接入到 外部网络(例如 internet ) 的网元, 提供地址分配、 计费、 分组包过滤、 策 略控制、数据分流功能、 NAS/无线接入网应用部分( RANAP , Radios Access Network Application Part )消息解析、 网络地址转换 ( NAT, Network Address Translation )、 本地 IP访问策略路由和执行等功能。 L-GW作为一个逻辑单 元在实际部署时既可以作为独立存在的网元, 也可以和现有的家用基站或 家用基站网关联合部署。 对于宏蜂窝实现本地接入架构, 或者没有家用基 站网关的接入架构, 可以通过图 7的架构实现。
在上述架构中, 本地网关和基站 /家用基站可能是属于企业或者家庭等 非移动运营商的第三方所有者。 因此, 为了保证本地连接的数据私密性, 应该尽量避免本地连接数据迂回到移动运营商的核心网。
另一方面, 为了减少建立本地连接对现有核心网网元的影响, 在基站 / 家用基站之间可以通过扩展接口, 直接交互相关信息, 从而不需要对核心 网的网关进行改造, 以降低网络的升级成本。
现有技术中, 在建立本地连接时, 通过扩展接口, 并通过 LTE接入建 立本地连接的流程如图 8所示, 主要包括以下步骤:
步骤 801 , 当 UE开机时发起附着过程 (附着请求 ) 注册到核心网中。 该条非接入层消息由基站(HeNB/eNB )封装在 S1接口的初始化用户消息 中带给 MME,基站还将自身是否支持本地 IP访问( LIPA, Local IP Access ) 的能力告知核心网。 如果 UE感知本地接入, 那么附着请求中还将包含 UE 希望建立本地连接的信息, 该信息包括但不限于特殊的接入点名称(APN, Access Point Name ), 或者建立本地连接指示。
步骤 802, 如果网络中没有用户的上下文信息, 或者附着请求消息没有 完整性保护,或者完整性保护失败,那么 MME执行对用户的鉴权认证过程, 即安全 /鉴权 /授权验证。 步骤 803~804, 如果 UE在附着请求中提供的建立本地连接的信息, 或 者 UE提供的协议配置选项 (PCO, Protocol Configuration Options )是经过 加密的,那么 MME通过发送加密信息获取请求消息并接收加密信息获取响 应消息以重新获取参数。
步骤 805 , 如果 MME中没有用户的签约数据, 则向 HSS发送更新位 置请求消息 (位置更新 ), 请求获得 UE的签约数据 (签约数据获取 )。
步骤 806~807, MME根据 UE的请求和 HSS的签约数据, 为 UE建立 相应的 PDN连接。 MME通过 S-GW向 L-GW发送创建会话请求消息, 其 中携带 UE标识, 签约的 QoS信息; L-GW向 S-GW返回创建会话响应, 其中携带分配的隧道端标识和地址等信息。
步骤 808, MME根据 UE的提供的信息(即附着请求消息中的 APN ), 以及签约信息或策略信息 (即本地或者 0&M配置的策略信息), 判断是否 为 UE建立本地连接(执行本地接入, 不建立核心网承载)。 如果判断结果 为是, 则确定为 UE建立本地连接, 然后进行后续步骤。
步骤 809, MME向基站 /家用基站发送初始上下文建立请求消息, 并在 其中包含允许为 UE建立本地接入及建立本地接入的相关信息,其中,相关 信息包括但不限于 APN以及 MME为 UE分配的全球唯一临时标识( GUTI, Globally Unique Temporary Identity ), 或 L-GW的隧道端标识和地址信息。 该请求中还包含发送给 UE的附着接受消息。
步骤 810, 基站 /家用基站向 L-GW发送创建会话请求, 其中携带基站 / 家用基站的隧道端标识 , UE的标识信息或者 L-GW分配的隧道端标识信息。
步骤 811 , L-GW根据创建会话请求消息中 UE标识信息、 或者 L-GW 分配的隧道端标识信息来绑定基站建立的承载与之前通过 S-GW建立的承 载之间的关系。
步骤 812, HeNB向 UE发送 RRC建立请求消息,并在其中包含附着接 受消息。
步骤 813 , UE建立 RRC, 并向 HeNB返回 RRC建立完成消息。
步骤 814, HeNB向 MME返回初始上下文建立响应消息。
步骤 815 , UE向 HeNB发送直传消息, 其中包含附着完成消息。
步骤 816, HeNB通过直传消息, 将附着完成消息发送给 MME。
至此, 本地连接建立完毕。 上述过程中的步骤 810~811 可以是在步骤 809、 或步骤 813、 或步骤 815之后执行。
UE建立了本地连接以后, 后续由于位置移动会引发切换, 在切换的过 程中, 源基站 /家用基站会对数据进行緩存。 如果基站 /家用基站间不支持数 据转发, 那么数据需要通过核心网进行转发, 因此本地连接数据的私密性 会受到影响。 另外, 由于家用基站本身成本的限制, 其数据緩存的能力也 会受到一定的限制。 发明内容
有鉴于此, 本发明的主要目的在于提供一种数据緩存的方法和系统, 以保护本地数据的私密性, 并降低基站 /家用基站, 尤其是家用基站的成本。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种数据緩存的方法, 该方法包括:
在用户终端 (UE )位置发生移动引起的切换流程中, 源无线侧网元通 知本地网关 (L-GW )进行数据緩存;
在切换完成后, 所述 L-GW将緩存的数据通过切换后的目标无线侧网 元下发给所述 UE。
进一步地, 所述源无线侧网元通过新增的消息类型通知 L-GW进行数 据緩存,或者通过扩展的修改承载请求消息或释放接入请求消息通知 L-GW 进行数据緩存。
进一步地,所述在 UE位置发生移动引起的切换流程中, 源无线侧网元 通知 L-GW进行数据緩存, 具体为:
所述源无线侧网元在发起切换流程后,通知所述 L-GW进行数据緩存; 或者,所述源无线侧网元在判断本地连接建立成功后,通知所述 L-GW 进行数据緩存。
该方法进一步包括:
所述源无线侧网元将所述 L-GW的隧道端标识和 /或地址信息发送给所 述目标无线侧网元, 所述目标无线侧网元才艮据所述 L-GW分配的隧道端标 识和 /或地址信息进行承载关联。
该方法进一步包括:
目标移动管理单元将 L-GW的隧道端标识和 /或地址信息发送给所述目 标无线侧网元, 所述目标无线侧网元 居所述 L-GW分配的隧道端标识和 / 或地址信息进行承载关联。
本发明还提供了一种数据緩存的系统, 该系统包括: UE所在的源无线 侧网元和 L-GW, 其中,
所述源无线侧网元,用于在 UE位置发生移动引起的切换流程中,通知 L-GW进行数据緩存;
L-GW,用于根据所述源无线侧网元的通知緩存数据,并在切换完成后, 将緩存的数据通过切换后的目标无线侧网元下发给所述 UE。
其中,所述源无线侧网元进一步用于,通过新增的消息类型通知 L-GW 进行数据緩存, 或者通过扩展的修改承载请求消息或释放接入请求消息通 知 L-GW进行数据緩存。
所述源无线侧网元进一步用于, 在发起切换流程后, 通知所述 L-GW 进行数据緩存;
或者, 在判断本地连接建立成功后, 通知所述 L-GW进行数据緩存。 所述源无线侧网元进一步用于, 将所述 L-GW的隧道端标识和 /或地址 信息发送给所述目标无线侧网元;
所述目标无线侧网元根据所述 L-GW的隧道端标识和 /或地址信息进行 承载关联。
该系统进一步包括: 目标移动管理单元, 用于将所述 L-GW的隧道端 标识和 /或地址信息发送给所述目标无线侧网元;
所述目标无线侧网元根据所述 L-GW的隧道端标识和 /或地址信息进行 承载关联。
本发明所提供的一种数据緩存的方法和系统,在 UE位置发生移动引起 的切换流程中, 源无线侧网元通知 L-GW进行数据緩存; 在切换完成后, L-GW将緩存的数据通过切换后的目标无线侧网元下发给 UE。通过本发明, 一方面能够有效的避免本地数据迂回到核心网带来的数据私密性问题, 另 一方面也能够减轻基站 /家用基站, 特别是家用基站数据緩存带来的成本提 升。 从而保护了本地数据的私密性, 也降低了基站 /家用基站, 尤其是家用 基站的成本。 附图说明
图 1为现有技术中 EPS的结构示意图;
图 2为现有技术中 3G家庭基站网络的架构示意图;
图 3为现有技术中 LTE家庭基站网络的架构示意图一;
图 4为现有技术中 LTE家庭基站网络的架构示意图二;
图 5为现有技术中 LTE家庭基站网络的架构示意图三;
图 6为现有技术中实现本地接入的网络架构示意图一;
图 7为现有技术中实现本地接入的网络架构示意图二;
图 8为现有技术中利用扩展接口建立本地连接的流程图;
图 9为本发明实施例一中数据緩存的方法流程图;
图 10为本发明实施例二中数据緩存的方法流程图。 具体实施方式
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 本发明所提供的一种数据緩存方法,主要包括: 在 UE位置发生移动引 起的切换流程中, 源无线侧网元通知 L-GW进行数据緩存; 在切换完成后, L-GW将緩存的数据通过切换后的目标无线侧网元下发给 UE。 本发明通过 在 UE的切换流程中, 由 L-GW代替无线侧网元进行数据的緩存处理, 一 方面是为了避免本地数据迂回到核心网带来的数据私密性问题, 另一方面 是为了减轻无线侧网元数据緩存所带来的成本提升。
基于上述的数据緩存方法, 下面结合具体实施例进一步详细说明。 图 9是利用本发明实现通知数据緩存的实施例一。 该实施例不限定基 站类型, 即家用基站或普通基站都可以。 流程描述中以家用基站为例, 对 普通基站的影响是相同的。 本实施例可以适用于 LTE 接入、 或 UTRAN/GERAN 接入的情况, 对于 LTE 接入来说, 家用基站 /基站为 HeNB/eNB , 移动管理单元为 MME; 对于 UTRAN/GERAN接入来说, 家 用基站 /基站为 HNB/无线网络控制器 (RNC , Radio Network Controller ), 移动管理单元为 SGSN。 而核心网 网关指的是位于核心网的 GGSN/S-GW/P-GW。对于家用基站的场景, 网络中可能存在家用基站网关, 如果存在家用基站网关, 那么所有家用基站和移动管理单元之间的消息都 需要经过家用基站网关。 进一步的, 家用基站和 L-GW之间的消息既可以 通过家用基站网关, 也可以不通过家用基站网关, 对于通过家用基站网关 转发消息的场景, 家用基站网关对经过的消息进行透传。
该实施例同样适用于 S-GW变化的场景, 但是由于本发明的发明内容 不涉及 S-GW变化带来的消息或者流程变化, 因此, 此处不做赘述。
如图 9所示, 执行切换流程前, 用户已经建立了本地连接, 并且源家 用基站和 L-GW之间已经建立直接隧道。 切换前的数据路径为: UE 源家 用基站 L-GW, 切换的流程主要包括以下步骤:
步骤 901 , 源家用基站发起切换流程, 并要求 UE上报测量报告。
步骤 902 , 源家用基站向 L-GW发送数据緩存通知消息,其中携带需要 緩存的承载列表, 或者 PDN连接的标识信息, 或者緩存指示。
本发明不限定该通知消息的具体实现方式, 可以通过增加新的消息类 型来实现; 也可以通过扩展现有的修改承载请求消息、 或释放接入请求消 息来实现。
步骤 903 , L-GW收到数据緩存通知消息后,本地緩存相关承载的数据, 即不再向源家用基站发送数据。
步骤 904, 源家用基站选择了目标家用基站后, 向源移动管理单元发送 切换请求消息, 其中包含目标家用基站标识或目标小区标识、 目标跟踪区 或路由区标识、 UE的承载标识、 以及源家用基站需要透传给目标家用基站 的容器等信息。 其中容器信息中可以包含 L-GW分配的隧道端标识。
步骤 905 ,源移动管理单元向目标移动管理单元发送转发重定位请求消 息, 其中携带 UE的上下文信息。
由于 UE已经建立了本地连接,则上下文信息中还需要包含 S-GW的地 址和隧道端标识、 以及 L-GW的地址和 /或隧道端标识等信息。
步骤 906, 目标移动管理单元判断是否需要重新选择 S-GW, 本实施例 中判定为不需要。 目标移动管理单元向目标家用基站发送切换请求, 其中 携带 S-GW的地址和隧道端标识、 和 L-GW的地址信息和 /或隧道端标识给 标基站。
L-GW 的地址和 /或隧道端标识主要用于目标家用基站做承载关联, 其 包含在源家用基站发给目标家用基站的容器信息中, 和 /或包含在目标移动 管理单元发给目标家用基站的切换请求中。
步骤 907 , 目标家用基站向目标移动管理单元返回切换请求应答消息, 其中携带成功建立的承载信息和建立失败的承载信息, 以及目标家用基站 向源家用基站返回的容器信息。
步骤 908 , 目标移动管理单元向源移动管理单元返回转发重定位响应消 息, 其中携带功建立的承载信息和建立失败的承载信息, 以及目标家用基 站向源家用基站返回的容器信息。
步骤 909 , 源移动管理单元向源家用基站返回切换命令, 其中携带功建 立的承载信息和建立失败的承载信息, 以及目标家用基站向源家用基站返 回的容器信息。
步骤 910 ,源家用基站向 UE发送切换命令信息通知 UE进行路径切换。 步骤 911 , UE切换到目标网络, 向目标家用基站发送切换完成请求。 步骤 912 , 目标基站向目标移动管理单元发送切换通知请求, 其中携带 以下至少一种信息: UE当前接入的基站标识、 跟踪区或路由区标识、 小区 标识、 目标基站的地址和用户面隧道端标识。
步骤 913 , 目标移动管理单元向 S-GW发送修改承载请求,其中携带目 标基站的用户面地址和隧道端标识。如果需要上报位置信息, S-GW还需要 向 L-GW发送修改承载请求。
步骤 914 , L-GW向 S-GW返回修改承载响应, S-GW向目标移动管理 单元返回修改承载响应。
步骤 915 , 目标家用基站向 L-GW发送修改承载请求, 其中携带 L-GW 的地址和隧道端标识, 以及目标家用基站的地址和隧道端标识等信息。
步骤 916 , L-GW切换数据路由路径, 通过更新后的路由发送数据。 更 新后的路由路径为: UE 目标家用基站 L-GW。
步骤 917 , L-GW向目标家用基站发送修改承载响应消息。
需要说明的是, 步骤 915~917在步骤 91 1之后执行。 本实施例同样适 用于移动管理单元没有发生变化的场景。 如果移动管理单元没有发生变化, 则上述的源移动管理单元和目标移动管理单元为同一网元, 所有源移动管 理单元与目标移动管理单元之间交互的信令都可以省略。
图 10是利用本发明实现通知数据緩存的实施例二。 该实施例不限定基 站类型, 即家用基站或者普通基站都可以。 流程描述中以家用基站为例, 对普通基站的影响是相同的。 本实施例可以适用于 LTE 接入、 或 UTRAN/GERAN 接入的情况, 对于 LTE 接入来说, 家用基站 /基站为 HeNB/eNB, 移动管理单元为 MME; 对于 UTRAN/GERAN接入来说, 家 用基站 /基站为 HNB/RNC,移动管理单元为 SGSN。 而核心网网关指的是位 于核心网的 GGSN/SGW/PGW。 对于家用基站的场景, 网络中可能存在家 用基站网关, 如果存在家用基站网关, 那么所有家用基站和移动管理单元 之间的消息都需要经过家用基站网关。 进一步的家用基站和 L-GW之间的 消息, 可以通过家用基站网关, 也可以不通过家用基站网关。 对于通过家 用基站网关转发消息的场景, 家用基站网关对经过的消息进行透传。
该实施例同样适用于 S-GW变化的场景, 但是由于本发明的发明内容 不涉及 S-GW变化带来的消息或者流程变化, 因此此处不做赞述。
如图 10所示, 执行切换流程前, 用户已经建立了本地连接, 并且源家 用基站和 L-GW之间已经建立直接隧道。 切换前的数据路径为: UE 源家 用基站 L-GW。 切换的流程主要包括以下步骤:
步骤 1001 , 源家用基站发起切换流程, 并要求 UE上报测量报告。 步骤 1002~1007执行的过程, 与实施例一中的步骤 904~909类似, 此 处不再重复描述。
步骤 1008 , 源家用基站判断本地连接是否建立成功, 并在判断建立成 功时向 L-GW发送数据緩存通知消息, 其中携带需要緩存的承载列表, 或 PDN连接的标识信息, 或緩存指示。
本发明不限定该通知消息的具体实现方式, 可以通过增加新的消息类 型来实现; 也可以通过扩展现有的修改承载请求消息、 或释放接入请求消 息来实现。
步骤 1009, L-GW收到数据緩存通知消息后, 本地緩存相关承载的数 据, 即不再向源家用基站发送数据。
步骤 1010~1017执行的过程, 与实施例一中的步骤 910~917类似, 此 处不再赘述。 景。 如果移动管理单元没有发生变化, 则上述的源移动管理单元和目标移 动管理单元为同一网元, 所有源移动管理单元与目标移动管理单元之间交 互的信令都可以省略。
对应上述数据緩存的方法, 本发明还提供了一种数据緩存的系统, 包 括: UE所在的源无线侧网元和 L-GW。 其中, 源无线侧网元, 用于在 UE 位置发生移动引起的切换流程中, 通知 L-GW进行数据緩存; L-GW, 用于 根据源无线侧网元的通知緩存数据, 并在切换完成后, 将緩存的数据通过 切换后的新路径下发给 UE。
较佳的, 源无线侧网元可以通过新增的消息类型通知 L-GW进行数据 緩存, 也可以通过扩展的修改承载请求消息、 或释放接入请求消息通知 L-GW进行数据緩存。
源无线侧网元可以在发起切换流程后, 通知 L-GW进行数据緩存; 也 可以在判断本地连接建立成功后, 通知 L-GW进行数据緩存。
另外, 在切换流程中, 源无线侧网元或目标移动管理单元还需要将 L-GW 分配的隧道端标识和 /或地址信息发送给目标侧网元, 从而目标无线 侧网元可以根据 L-GW分配的隧道端标识和 /或地址信息进行承载关联。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种数据緩存的方法, 其特征在于, 该方法包括:
在用户终端 (UE )位置发生移动引起的切换流程中, 源无线侧网元通 知本地网关 (L-GW )进行数据緩存;
在切换完成后, 所述 L-GW将緩存的数据通过切换后的目标无线侧网 元下发给所述 UE。
2、 根据权利要求 1所述数据緩存的方法, 其特征在于, 所述源无线侧 网元通过新增的消息类型通知 L-GW进行数据緩存, 或者通过扩展的修改 承载请求消息或释放接入请求消息通知 L-GW进行数据緩存。
3、 根据权利要求 1 或 2 所述数据緩存的方法, 其特征在于, 所述在 UE位置发生移动引起的切换流程中,源无线侧网元通知 L-GW进行数据緩 存, 具体包括:
所述源无线侧网元在发起切换流程后,通知所述 L-GW进行数据緩存; 或者,所述源无线侧网元在判断本地连接建立成功后,通知所述 L-GW 进行数据緩存。
4、 根据权利要求 1或 2所述数据緩存的方法, 其特征在于, 该方法进 一步包括:
所述源无线侧网元将所述 L-GW的隧道端标识和 /或地址信息发送给所 述目标无线侧网元, 所述目标无线侧网元才艮据所述 L-GW分配的隧道端标 识和 /或地址信息进行承载关联。
5、 根据权利要求 1或 2所述数据緩存的方法, 其特征在于, 该方法进 一步包括:
目标移动管理单元将 L-GW的隧道端标识和 /或地址信息发送给所述目 标无线侧网元, 所述目标无线侧网元 居所述 L-GW分配的隧道端标识和 / 或地址信息进行承载关联。
6、 一种数据緩存的系统, 其特征在于, 该系统包括: UE 所在的源无 线侧网元和 L-GW, 其中,
所述源无线侧网元,用于在 UE位置发生移动引起的切换流程中,通知 L-GW进行数据緩存;
L-GW,用于根据所述源无线侧网元的通知緩存数据,并在切换完成后, 将緩存的数据通过切换后的目标无线侧网元下发给所述 UE。
7、 根据权利要求 6所述数据緩存的系统, 其特征在于, 所述源无线侧 网元进一步用于, 通过新增的消息类型通知 L-GW进行数据緩存, 或者通 过扩展的修改承载请求消息或释放接入请求消息通知 L-GW进行数据緩存。
8、 根据权利要求 6或 7所述数据緩存的系统, 其特征在于, 所述源无 线侧网元进一步用于, 在发起切换流程后, 通知所述 L-GW进行数据緩存; 或者, 在判断本地连接建立成功后, 通知所述 L-GW进行数据緩存。
9、 根据权利要求 6或 7所述数据緩存的系统, 其特征在于, 所述源无 线侧网元进一步用于, 将所述 L-GW的隧道端标识和 /或地址信息发送给所 述目标无线侧网元;
所述目标无线侧网元 居所述 L-GW分配的隧道端标识和 /或地址信息 进行承载关联。
10、 根据权利要求 6或 7所述数据緩存的系统, 该系统进一步包括: 目标移动管理单元, 用于将所述 L-GW分配的隧道端标识和 /或地址信息发 送给所述目标无线侧网元;
所述目标无线侧网元 居所述 L-GW分配的隧道端标识和 /或地址信息 进行承载关联。
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