WO2011110106A1 - 根据ue状态进行数据面通路选择的方法、系统及装置 - Google Patents

根据ue状态进行数据面通路选择的方法、系统及装置 Download PDF

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Publication number
WO2011110106A1
WO2011110106A1 PCT/CN2011/071740 CN2011071740W WO2011110106A1 WO 2011110106 A1 WO2011110106 A1 WO 2011110106A1 CN 2011071740 W CN2011071740 W CN 2011071740W WO 2011110106 A1 WO2011110106 A1 WO 2011110106A1
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Prior art keywords
lgw
lipa
status
sipto
connection
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PCT/CN2011/071740
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English (en)
French (fr)
Inventor
王胡成
艾明
周燕飞
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电信科学技术研究院
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Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Priority to US13/634,543 priority Critical patent/US9204475B2/en
Priority to EP11752849.7A priority patent/EP2547150B1/en
Publication of WO2011110106A1 publication Critical patent/WO2011110106A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/12Setup of transport tunnels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/20Manipulation of established connections
    • H04W76/22Manipulation of transport tunnels

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, system and apparatus for data path selection according to UE status. Background technique
  • FIG. 1 it is a schematic diagram of a network architecture of the prior art LIPA/SIPTO.
  • a UE User Equipment
  • APN Access Point Name
  • AttacM attachment type to the MME (Mobility Management Entity).
  • the mobility management entity indicates that the request is for LIPA access.
  • the MME selects the LGW to serve the UE.
  • the minimum granularity of the LIPA access is the PDN (Packet Data Network) Connection level.
  • the MME may also make the HeNB perform SIPTO according to the network status and the service type requested by the UE.
  • the MME may indicate to the L-GW that the connection is used for SIPTO by using a special APN or a special identifier, and the minimum granularity of the SIPTO service is the PDN Connection. level.
  • the Direct Tunnel should be inactive.
  • the LGW triggers the SGW (Serving Gateway) through the S5/S8-U Tunnel. Send Paging Signaling.
  • the MME After the UE enters the connection state, that is, after the UE initiates the Service Request process, the MME notifies the S5 PGW TEID (LGW Assignment) to the HeNB through the S1-MME interface, and the HeNB stores the TEID (Tunnel Identity) in the Radio Bearer.
  • the Context Radio Bearer Context
  • the LGW and the HeNB can use the Direct Tunnel to transmit data: For the downlink data, the LGW needs to perform EPS (Evolved Packet System) bearer binding, find the corresponding S5 PGW TEID, and then the LGW will packet. To the Direct Tunnel, the data packet should carry the S5 PGW TEID information.
  • EPS Evolved Packet System
  • the HeNB After receiving the packet, the HeNB finds the corresponding E-RAB (Radio Access Bear) Context and Radio according to the S5 PGW TEID in the packet. The bearer is then sent to the UE. For the uplink data, the HeNB needs to check whether there is information about the S5 PGW TEID in its E-RAB Context. If so, the HeNB selects the Direct Tunnel and transmits data to the LGW.
  • E-RAB Radio Access Bear
  • the HeNB determines whether to use the Direct Tunnel according to whether the S5 PGW TEID exists in the E-RAB Context, and for the downlink data, the LGW. It is also necessary to decide whether to use Direct Tunnel based on some kind of identity. If the UE enters the connected state, that is, after the Service Request process or the UE Requested PDN Connectivity process, the LGW needs to choose to use the Direct Tunnel. When the UE enters the idle state, that is, after the SI Release process, the LGW needs to select the S5/S8-U Tunnel. To trigger the SGW to send Paging signaling when there is downlink data coming. However, in the prior art, the LGW does not know the state of the UE, and therefore cannot determine when to use the Direct Tunnel and when to use the S5/S8-U Tunnel. Summary of the invention
  • Embodiments of the present invention provide a method, a system, and a device for selecting a data plane path according to a UE state, so as to solve the problem that the LGW cannot know the state of the UE. Defects in the selection of the tunnel or S5/S8-U tunnel.
  • the present invention provides a method for selecting a data plane path according to a user equipment UE state, including the following steps:
  • the local gateway LGW sets a state of the path identifier of the LGW according to an indication of the serving gateway SGW;
  • the LGW selects a data plane path based on the state of the path identifier.
  • Another aspect of the present invention provides a system for selecting a data plane path according to a UE state, including an SGW and an LGW, where the SGW is configured to determine whether a state of the UE and a connection are used for LIPA/SIPTO, and indicate the
  • the LGW is configured to set a state of the path identifier of the LGW according to an indication of the SGW, and select a data plane path according to the state of the path identifier.
  • a further aspect of the present invention provides an LGW, including a setting module and a path selection module, where the setting module is configured to set a state of the path identifier according to an indication of the SGW; The status of the path identifier selects the data plane path.
  • a further aspect of the present invention further provides a method for selecting a data plane path according to a UE state, including the following steps: when the UE enters an idle state, the LGW selects to use the S5/S8-U Tunnel; when the UE enters the connected state, the LGW choose to use Direct Tunnel.
  • the present invention uses a path identifier in the LGW to select an appropriate data plane path, and proposes a method of controlling setting/clearing the path identifier. Therefore, the present invention is fully functional and can complete the shortcomings of the prior art LIPA/SIPTO architecture.
  • FIG. 1 is a schematic diagram of a network architecture of a prior art LIPA/SIPTO
  • FIG. 2 is a schematic diagram of the allocation of TEID in the prior art
  • FIG. 3 is a schematic diagram of a UE when a UE enters a Connected state according to Embodiment 1 of the present invention; Schematic diagram of the Requested PDN Connectivity or Attach process; FIG. 4 is a diagram of the service when the UE enters the Connected state according to the first embodiment of the present invention;
  • FIG. 5 is a schematic diagram of a SI Release process when a UE enters an Idle state according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of a UE Requested PDN Connectivity or Attach process when a UE enters a Connected state according to Embodiment 2 of the present invention
  • FIG. 7 is a schematic diagram of a Service Request process when a UE enters a Connected state according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic diagram of a SI Release process when a UE enters an Idle state according to Embodiment 2 of the present invention.
  • FIG. 9 is a structural diagram of a system for selecting a data plane path according to a UE state according to an embodiment of the present invention. detailed description
  • a path identifier is added to each UE in the LGW.
  • the identifier is invalid; when the UE enters the Connected state, the identifier is set to be valid.
  • the LGW chooses to use the S5/S8-U tunnel.
  • the LGW chooses to use the Direct Tunnel, so that the LGW can select the data plane path according to the UE status.
  • control of the path identifier in the LGW can be implemented by the following embodiments, thereby implementing control of the data plane path selection. It should be noted that the following embodiments are preferred embodiments of the present invention, and the present invention is not limited to the following embodiments, and those skilled in the art can also The following embodiments are subject to equivalent changes or modifications, and such equivalent changes or modifications are intended to be included within the scope of the present invention.
  • the MME needs to add IE in the GTPC (GPRS Tunneling Protocol for Control Plane) message (such as the Create Session Request message).
  • GTPC GPRS Tunneling Protocol for Control Plane
  • the information element is used to notify the SGW that the PDN connection is using the LIPA/SIPTO connection, so that the SGW notifies the PGW how to select the data plane path.
  • This embodiment is suitable for application in a scenario where the UE status does not change frequently. Reduce resource usage and maintenance operations of the SGW.
  • the UE-requested PDN Connectivity or Attach process is shown in Figure 3, where steps 1, 4, 5, 6-12, and 14-16 are prior art, and are not described here. For details, refer to the protocol TS23.401 5.10.2. The steps related to the embodiment of the present invention are described in detail below.
  • Step 5a When the UE requests the LIPA connection or the network determines to use the SIPTO connection, the LGW sets the path identifier of the connection to be valid, indicating that the LGW uses the Direct TunneL step 13.
  • the MME determines that the connection is LIPA/SIPTO according to the context of the PDN Connection.
  • the MME adds a LIPA/SIPTO connection setup identifier to the Modify Bearer Request message, indicating to the SGW that the PDN Connection is for the LIPA/SIPTO service.
  • Step 13a the step is an optional step. If the step occurs, the SGW forwards the LIPA/SIPTO connection establishment identifier in the Modify Bearer Request message. If the path identifier of the PDN Connection in the LGW is invalid at this time, it needs to be set to effective.
  • the service request (Service Request) process is shown in Figure 4, where steps 1 ⁇ 7, 10, 11 and 12 are prior art, and are not described here. For details, refer to the protocol TS23.401 5.3.4. The steps related to the present invention are described in detail.
  • Step 8 When the MME determines that the connection is a LIPA/SIPTO connection according to the context of the PDN Connection, the MME adds a LIPA/SIPTO connection establishment identifier to the Modify Bearer Request message, and indicates to the SGW that the PDN Connection is used for the LIPA/SIPTO service.
  • Step 9 If the Modify Bearer Request message received by the SGW carries the LIPA/SIPTO connection establishment identifier, the Modify Bearer Request message carrying the LIPA/SIPTO connection establishment identifier is forwarded to the PGW, indicating that the UE enters the Connected state.
  • Step 11a The LGW receives the Modify Bearer Request message and carries the LIPA/SIPTO connection establishment identifier. After sending the Modify Bearer Response message, the path identifier is set to valid, indicating that the connection will use the Direct Tunnel.
  • Steps 1 and 3 to 6 are prior art and will not be described here. For details, refer to the protocol TS 23.401 5.3.5. The following describes the steps related to the present invention. .
  • Step 2 the MME needs to add the LIPA/SIPTO identifier to the default bearer ID of these PDN Connections in order to distinguish between the PDN Connection and the normal PDN Connection for the LIPA/SIPTO service.
  • Step 7a After receiving the Bearer ID with the LIPA/SIPTO connection teardown identifier, the SGW will identify the connection to the corresponding PDN Connection through the Modify Bearer Request message, and then follow the corresponding steps in the existing protocol TS23.401 5.3.5. 2 to deal with.
  • Step 7b When the LGW receives the LIPA/SIPTO connection teardown flag, the path identifier is invalidated, indicating that the connection will use the S5/S8-U tunnel. Send Modify Bearer Response to SGW at the same time.
  • the system uses a special identifier to notify the LGW, it needs to carry the identifier in the Create Session Request message, and also, in order to modify the Bearer.
  • the Request message indicates whether the LIPA/SIPTO connection should exist and also needs to carry the identifier, so an indication can be added in the IE "Indication Flags", as shown in the following table:
  • the Create Session Request message carries the identifier to indicate whether to establish a LIPA/SIPTO connection.
  • the bit is 1, indicating that the connection is a LIPA/SIPTO connection.
  • the bit is 0, indicating that the connection does not use LIPA/SIPTO.
  • the Modify Bearer Request message carries the identifier only in the LIPA/SIPTO connection. If the path identifier is 1, indicating that the existing LIPA/SIPTO connection is in use, the UE enters the connected state, and the LGW will use the Direct Tunnel. When the path identifier is 0, it indicates that the existing LIPA/SIPTO connection is not used, the UE enters the idle state, and the LGW will use the S5-U tunnel.
  • the SGW transparently forwards the identifier.
  • the SGW determines which PDN Connections need to send the Modify Bearer Reqeust message with the LS flag bit 0 through the LIPA/SIPTO identifier carried in the Release Release Bearer Request message.
  • an identifier is added to indicate which tunnel is used by the LIPA/SIPTO connection, whether it is a Direct Tunnel or an S5-U Tunnel.
  • the identifiers are as follows:
  • the Direct Tunnel indicator When the Direct Tunnel indicator is valid, it indicates that the LGW uses the Direct Tunnel for LIPA/SIPTO data transmission. When this indicator is invalid, it indicates that the LGW uses the S5-U Tunnel.
  • the SGW when the PGW connection is established, the SGW carries the LIPA/SIPTO identifier in the Context of the PDN Connection to indicate whether the PDN Connection is using the LIPA/SIPTO connection, and then causes the SGW to notify the PGW.
  • the selection of the data plane path is suitable for application in a scenario in which the UE status changes frequently, and the amount of information carried in the signaling message can be reduced.
  • Steps 1, 4, 5, and 6-16 are the prior art, and are not described here. For details, refer to the protocol TS23.401 5.10.2. The steps related to the present invention are described in detail.
  • Step 2 The MME carries an identifier in the Create Session Request message, indicating that the PDN Connection is used for the LIPA/SIPTO connection. After receiving the identifier, the SGW adds a LIPA/SIPTO flag to the Context of the PDN Connection, indicating that the PDN Connection is used for LIPA/SIPTO connection.
  • Step 3 The Serving GW sends a Create Session Request to the PGW.
  • the PGW is the LGW. If the system uses a special APN to notify the LGW, the LGW determines whether the connection is used for LIPA/SIPTO, otherwise the LIPA/SIPTO connection is carried in the Create Session Request message. Establish an identity.
  • Step 5a When the LGW receives the LIPA/SIPTO connection establishment identifier, the LGW sets the path identifier of the UE to be valid, indicating that the LGW uses the Direct Tunnel.
  • Step 13a This step is an optional step. If the step occurs, the SGW checks the PDN Connection Context to which the received Modify Bearer Request message belongs. At this time, the PDN Connection carries the LIPA/SIPTO flag, and the SGW sends the LIPA/SIPTO to the PGW. The Modify Bearer Request message is set up to establish the identity. If the path identifier of the PDN Connection in the LGW is invalid at this time, it needs to be valid.
  • Steps 1-8, 10, 11 and 12 are prior art, and are not described here. For details, refer to the protocol TS23.401 5.3.4, which is related to the present invention. The steps are described in detail.
  • Step 9 If the PDN Connection to which the Modify Bearer Request message received by the SGW belongs is LIPA/SIPTO, the SGW sends a Modify Bearer Request message carrying the LIPA/SIPTO connection establishment identifier to the PGW, indicating that the UE enters the Connected state. Step 11a.
  • the LGW receives the Modify Bearer Request message and carries the LIPA/SIPTO connection establishment identifier. After sending the Modify Bearer Response message, the path identifier is set to be valid, indicating that the connection will use the Direct Tunnel.
  • Steps 1 to 16 are prior art, and are not described here. For details, refer to the protocol TS23.401 5.3.5. The steps related to the present invention are described in detail below.
  • Step 7a After the SGW receives the Default Bearer ID list in the Release Access Bearer Request message, it searches whether the PDN Connection corresponding to each Default Bearer ID carries the LIPA/SIPTO identifier, and if so, sends a Modify Bearer Request message to the corresponding LGW. And carry the LIPA/SIPTO connection teardown identifier in the message, and then process according to the corresponding step 2 in the existing protocol TS23.4015.3.5.
  • Step 7b When the LGW receives the LIPA/SIPTO connection teardown flag, the path identifier is invalidated, indicating that the connection will use the S5/S8-U tunnel. Send Modify Bearer Response to SGW at the same time.
  • the ID is carried in the Create Session Request message.
  • the identifier needs to be carried, so Add an indication to the IE "Indication Flags" as shown in the following table:
  • the Create Session Request message carries the identifier to indicate whether the establishment is established.
  • the bit is 1, indicating that the connection is a LIPA/SIPTO connection, the bit is 0, indicating that the connection does not use LIPA/SIPTO.
  • the identifier carried in the Modify Bearer Request message is valid only in the LIPA/SIPTO connection. If the path identifier is 1, the existing LIPA/SIPTO needs to be used. The connection is in use, and the UE enters the connected state; if the path identifier is 0 at this time, it indicates that the existing LIPA/SIPTO connection is temporarily not used, and the UE enters the idle state.
  • the SGW checks whether the PDN Connection to which the received Modify Bearer Request message belongs has a LIPA/SIPTO flag. If yes, the SGW sets the LS flag to 1 in the Modify Bearer Request message sent to the LGW.
  • the SGW searches for the PDN Connection corresponding to each Default Bearer ID in the Release Access Bearer Request message with the LIPA/SIPTO identifier. If yes, sends a Modify Bearer Request message to the corresponding LGW, and sets the message in the message.
  • the LS flag is 0.
  • an identifier is added to indicate which tunnel is used by the LIPA/SIPTO connection, whether it is a Direct Tunnel or an S5-U Tunnel.
  • the identifiers are as follows:
  • IP Address (es) IPv4 address and/or IPv6 prefix
  • IPv4v6 PDN type IPv4, IPv6, or IPv4v6
  • control plane control plane signalling
  • control plane for the control plane.
  • S-GW Address in Use (user The IP address of the S-GW currently used for sending user plane) plane traffic. (For PMIP—based S5/S8 only).
  • control plane plane interface. (For GTP-based S5/S8 only) .
  • P-GW Address in Use (user The IP address of the P-GW currently used for sending user plane) plane traffic. (For PMIP-based S5/S8 only).
  • the MME and/or SGSN serving the UE support (s) procedures support indication for reporting User Location Information and/or User CSG
  • MS Info Change Reporting Denotes whether the MME and/or the SGSN is/are requested
  • this field indicates s separately whether the MME/SGSN are requested to send changes in User
  • CSG Information for (a) CSG eel Is, (b) hybrid eel Is in which the subscriber is a CSG member, and (c) hybrid eel Is in which the subscriber is not a CSG member, or any
  • BCM The negotiated Bearer Control Mode for GERAN/UTRAN.
  • the default bearer is the one which is established first within the PDN connection. (For GTP based S5/S8 or for PMIP based S5/S8 if multiple PDN
  • Direct Tunnel indicator When the Direct Tunnel indicator is valid, it indicates that the LGW uses Direct Tunnel for LIPA/SIPTO data transmission. When this indicator is invalid, it indicates that the LGW uses S5-UTunnel.
  • FIG. 9 is a structural diagram of a system for selecting a data plane path according to a UE state according to an embodiment of the present invention.
  • the system includes SGW 100 and LGW 200.
  • the SGW 100 is configured to determine whether the state of the UE and the connection are for LIPA/SIPTO and indicate to the LGW 200.
  • the LGW 200 is configured to enter the status of the path identifier of the LGW 200 according to the indication of the SGW 100. Line settings, and selecting data plane paths based on the status of the path identification.
  • the LGW 200 selects to use the S5/S8-U tunnel.
  • the status of the path identifier is valid, and the LGW 200 selects to use the Direct Tunnel.
  • the system further includes an MME 300, configured to carry an indication notification SGW 100 in the session creation request Create Session Request message, and then notify by the SGW 100, when determining that the connection to be established is used for LIPA/SIPTO LGW 200, LGW 200 sets the status of the path identification to be valid.
  • MME 300 configured to carry an indication notification SGW 100 in the session creation request Create Session Request message, and then notify by the SGW 100, when determining that the connection to be established is used for LIPA/SIPTO LGW 200, LGW 200 sets the status of the path identification to be valid.
  • the system further includes an MME 300, configured to add a LIPA/SIPTO connection establishment identifier to the Modify Bearer Request message when the connection is determined to be a LIPA/SIPTO connection according to the context of the PDN Connection.
  • the SGW 100 is notified that the PDN Connection is for the LIPA/SIPTO service, and the LGW 200 is notified by the SGW 100, and the LGW 200 sets the status of the path identifier to be valid.
  • LGW 200 includes a setup module 210 and a path selection module 220.
  • the setting module 210 is configured to set the state of the path identification according to the indication of the SGW 100.
  • Path selection module 220 is operative to select a data plane path based on the state of the path identification.
  • the path selection module 220 selects to use the S5/S8-U Tunnd.
  • the path selection module 220 selects to use the Direct Tunnel.
  • the present invention uses a path identifier in the LGW to select an appropriate data plane path, and proposes a method of controlling the setting/clearing of the path identifier. Therefore, the present invention is fully functional and can complete the shortcomings of the prior art LIPA/SIPTO architecture.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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Description

根据 UE状态进行数据面通路选择的方法、 系统及装置 本申请要求于 2010年 3 月 12 日提交中国专利局, 申请号为 201010124871.6, 发明名称为 "根据 UE状态进行数据面通路选择的 方法、 系统及装置" 的中国专利申请的优先权, 其全部内容通过引用 结合在本申请中。 技术领域
本发明涉及通信技术领域, 特别涉及一种根据 UE状态进行数据 面通路选择的方法、 系统及装置。 背景技术
现有的 LIPA ( Local IP Access ,本地 IP接入 ) /SIPTO ( Selected IP Traffic Offload, 选择性 IP分流)技术中, 在现有的 H(e)NB (家庭演 进基站) 系统中, 增设 LGW ( Local Gateway, 本地网关), 当启用 LIPA/SIPTO功能时, LGW和 H(e)NB使用 Direct Tunnel (直通隧道 ) 进行上下行数据传输。 如图 1所示, 为现有技术的 LIPA/SIPTO的网 络架构示意图。 在这种架构中, 当 UE ( User Equipment, 用户设备) 请求 LIPA接入时, 可能会通过特殊 APN ( Access Point Name, 接入 点名称)或特殊的 AttacM附着)类型,向 MME( Mobility Management Entity , 移动性管理实体)表明请求进行 LIPA接入, MME此时会选 择 LGW来为 UE服务,此时 LIPA接入的最小粒度为 PDN( Packet Data Network, 分组数据网 ) Connection (连接)级别。 另外, MME也 可根据网络状况和 UE请求的服务类型, 让 HeNB做 SIPTO, MME 可以使用特殊 APN或特殊的标识向 L-GW表明此连接用于 SIPTO, 此时 SIPTO服务的最小粒度是 PDN Connection级别。
当 UE进入空闲态, 即 UE经过 SI Release (释放 )过程之后, Direct Tunnel应处于不激活状态,当有下行数据时, LGW通过 S5/S8-U Tunnel触发 SGW ( Serving Gateway, 月良务网关)发 Paging (寻呼) 信令。
当 UE进入连接态, 即 UE发起 Service Request (服务请求 )过 程之后, MME会通过 S1-MME接口将 S5 PGW TEID ( LGW分配 ) 通知给 HeNB, 由 HeNB将此 TEID (隧道标识 )存放在 Radio Bearer Context (无线承载上下文 ) 中, 最后 TEID的分配情况如图 2所示。 此时, LGW和 HeNB之间可以使用 Direct Tunnel传送数据: 对于下 行数据, LGW需要先进行 EPS ( Evolved Packet System, 演进的分组 系统 ) Bearer绑定, 找到对应的 S5 PGW TEID, 然后 LGW将数据 包发往 Direct Tunnel ,此数据包应携带 S5 PGW TEID信息, 当 HeNB 收到这个包之后, 根据包中的 S5 PGW TEID, 找到对应的 E-RAB ( Radio Access Bear, 无线接入承载 ) Context和 Radio Bearer, 然后 发送到 UE; 对于上行数据, HeNB需要查看其 E-RAB Context中是 否有 S5 PGW TEID的信息, 如果有, 则 HeNB选择 Direct Tunnel, 向 LGW传送数据。
在实现本发明的过程中,发明人发现现有技术中至少存在以下问 题: 现有技术中, HeNB会根据 E-RAB Context中是否存在 S5 PGW TEID而断定是否使用 Direct Tunnel, 对于下行数据, LGW也需要根 据某种标识来决定是否使用 Direct Tunnel。 如果 UE进入连接态, 即 经过 Service Request过程或 UE Requested PDN Connectivity过程之 后, LGW需要选择使用 Direct Tunnel; 而当 UE进入空闲态, 即经过 SI Release过程后, LGW需要选择使用 S5/S8-U Tunnel, 以在有下行 数据到来时, 触发 SGW发 Paging信令。 但是, 现有技术中 LGW不 知道 UE 的状态, 因此不能判断何时选用 Direct Tunnel, 何时选用 S5/S8-U Tunnel。 发明内容
本发明实施例提供一种根据 UE状态进行数据面通路选择的方 法、系统及装置,以解决由于 LGW不知道 UE的状态而无法对 Direct Tunnel或 S5/S8-U Tunnel进行选择的缺陷。
为达到上述目的, 本发明一方面提出一种根据用户设备 UE状态 进行数据面通路选择的方法, 包括以下步骤: 本地网关 LGW根据服 务网关 SGW的指示对所述 LGW的通路标识的状态进行设置; 所述 LGW根据所述通路标识的状态选择数据面通路。
本发明另一方面提出了一种根据 UE状态进行数据面通路选择的 系统, 包括 SGW和 LGW, 所述 SGW, 用于根据判断 UE的状态及 连接是否用于 LIPA/SIPTO, 并指示给所述 LGW; 所述 LGW, 用于 根据 SGW的指示对所述 LGW的通路标识的状态进行设置, 以及根 据所述通路标识的状态选择数据面通路。
本发明再一方面还提出了一种 LGW, 包括设置模块和通路选择 模块, 所述设置模块, 用于根据 SGW的指示对通路标识的状态进行 设置; 所述通路选择模块, 用于根据所述通路标识的状态选择数据面 通路。
本发明再一方面还提出了一种根据 UE状态进行数据面通路选择 的方法,包括以下步骤:当 UE进入空闲态时, LGW选择使用 S5/S8-U Tunnel; 当 UE进入连接态时, LGW选择使用 Direct Tunnel。
本发明使用在 LGW中设置通路标识来选择合适的数据面通路, 并提出了控制设置 /清除该通路标识的方法, 因此本发明功能完整, 可完善现有技术的 LIPA/SIPTO架构的不足。
本发明附加的方面和优点将在下面的描述中部分给出,部分将从 下面的描述中变得明显, 或通过本发明的实践了解到。 附图说明
本发明上述的和 /或附加的方面和优点从下面结合附图对实施例 的描述中将变得明显和容易理解, 其中:
图 1为现有技术的 LIPA/SIPTO的网络架构示意图;
图 2为现有技术的 TEID的分配情况示意图;
图 3 为本发明实施例一的当 UE 进入 Connected 态时 UE Requested PDN Connectivity或 Attach过程的示意图; 图 4 为本发明实施例一的当 UE进入 Connected 态时 Service
Request过程的示意图;
图 5为本发明实施例一的当 UE进入 Idle态时 SI Release过程的 示意图;
图 6 为本发明实施例二的当 UE 进入 Connected 态时 UE Requested PDN Connectivity或 Attach过程的示意图;
图 7 为本发明实施例二的当 UE进入 Connected 态时 Service Request过程的示意图;
图 8为本发明实施例二的当 UE进入 Idle态时 SI Release过程的 示意图;
图 9为本发明实施例根据 UE状态进行数据面通路选择的系统结 构图。 具体实施方式
下面详细描述本发明的实施例, 所述实施例的示例在附图中示 出,其中自始至终相同或类似的标号表示相同或类似的元件或具有相 同或类似功能的元件。 下面通过参考附图描述的实施例是示例性的, 仅用于解释本发明, 而不能解释为对本发明的限制。
本发明实施例中, 在 LGW中为每个 UE增设一个通路标识, 当 UE进入 Idle (空闲) 态时, 该标识置为无效; 当 UE进入 Connected (连接) 态时, 该标识置为有效。 当该标识置为无效时, LGW选择 使用 S5/S8-U Tunnel, 当该标识置为有效时, LGW选择使用 Direct Tunnel, 从而实现 LGW可根据 UE状态进行数据面通路的选择。
在本发明实施例中, 可通过以下实施例实现对 LGW中通路标识 的控制, 从而实现对数据面通路选择的控制。 但是需要说明的是, 以 下实施例为本发明的优选实施例,并不是说本发明仅能通过以下实施 例实现,本领域技术人员也可在不脱离本发明上述思想的前提下对以 下实施例进行等同的变化或修改,这些等同的变化或修改均应包含在 本发明的保护范围之内。
实施例一,
在该实施例中, 由于 SGW没有 UE的 context, 因此需要 MME 在 GTPC ( GPRS Tunneling Protocol for Control Plane, 控制平面的 演进的通用无线分组业务隧道协议 ) 消息 (如 Create Session Request 消息 ) 中添加 IE ( Information Elements, 信息元素 ) 来通知 SGW, 表明此 PDN Connection正在使用 LIPA/SIPTO连接, 进而使得 SGW 通知 PGW如何进行数据面通路的选择, 本实施例适合在 UE状态不 经常变化的场景中应用, 能够减少 SGW的资源使用和维护操作。
当 UE进入 Connected态时:
UE请求的 PDN连接( UE Requested PDN Connectivity )或附着 ( Attach )过程如图 3所示, 其中, 步骤 1 , 4, 5, 6-12, 14-16为 现有技术, 在此不再赘述, 具体可参考协议 TS23.401 5.10.2, 以下对 与本发明实施例有关的步骤进行详细描述。
步骤 2~3、 如果系统采用特殊标识来通知 LGW, 即将建立的连 接(待建立的连接)用于 LIPA/SIPTO,则需要在 Create Session Request (创建会话请求) 消息中携带此特殊标识。 如果系统使用特殊 APN 来通知 LGW, 则由 LGW自行判断该连接是否使用于 LIPA/SIPTO。 此处用于 LIPA/SIPTO连接的 PGW是 LGW。
步骤 5a、 当 UE请求的是 LIPA连接或网络判断使用 SIPTO连接 时, LGW置该连接的通路标识为有效,表明 LGW使用 Direct TunneL 步骤 13、 MME根据 PDN Connection的上下文判断出此连接是 LIPA/SIPTO连接时, MME在 Modify Bearer Request (修改承载请求 ) 消息中增加 LIPA/SIPTO 连接建立标识, 向 SGW 表明此 PDN Connection用于 LIPA/SIPTO服务。
步骤 13a、 该步骤为可选步骤, 如果该步骤发生, 则 SGW转发 Modify Bearer Request消息中的 LIPA/SIPTO连接建立标识, 如果此 时 LGW中该 PDN Connection的通路标识为无效, 则需置其为有效。 服务请求( Service Request )过程如图 4所示, 其中, 步骤 1 ~7 , 10, 11 , 12为现有技术, 在此不再赘述, 具体可参考协议 TS23.401 5.3.4, 以下对与本发明有关的步骤进行详细描述。
步骤 8. MME根据 PDN Connection的上下文判断出此连接是 LIPA/SIPTO 连接时, MME在 Modify Bearer Request 消息中增加 LIPA/SIPTO连接建立标识, 向 SGW表明此 PDN Connection用于 LIPA/SIPTO服务。
步骤 9. 如果 SGW收到的 Modify Bearer Request消息中携带 LIPA/SIPTO连接建立标识, 则向 PGW转发该携带 LIPA/SIPTO连接 建立标识的 Modify Bearer Request消息,表示 UE进入 Connected态。
步骤 11a . LGW 收到 Modify Bearer Request 消息中携带 LIPA/SIPTO连接建立标识, 在发送 Modify Bearer Response消息后, 将通路标识置为有效, 表明此连接将使用 Direct Tunnel。
当 UE进入 Idle态时:
SI Release过程如图 5所示, 其中, 步骤 1 , 3~6为现有技术, 在此不再赘述, 具体可参考协议 TS23.401 5.3.5 , 以下对与本发明有 关的步骤进行详细描述。
步 2. MME在 Release Access Bearer Request消息中, 为了区 分用于 LIPA/SIPTO服务的 PDN Connection和普通 PDN Connection, 需要在这些 PDN Connection的 default bearer ID中增加 LIPA/SIPTO 标识。
步骤 7a.当 SGW收到带有 LIPA/SIPTO连接拆除标识的 Bearer ID 后,将通过 Modify Bearer Request消息将连接拆除标识给对应的 PDN Connection, 然后按现有协议 TS23.401 5.3.5中对应步骤 2来处理。
步骤 7b. 当 LGW收到 LIPA/SIPTO连接拆除标识后, 将通路标 识置为无效, 表明此连接将使用 S5/S8-U Tunnel。 同时发送 Modify Bearer Response到 SGW。
在上述实施例中, 如果系统采用特殊标识来通知 LGW, 则需要 在 Create Session Request消息中携带标识,同样,为了在 Modify Bearer Request消息指示 LIPA/SIPTO连接是否应该存在, 也需要携带标识 , 因此可以在 IE "Indication Flags" 中添加一个指示, 如下表所示:
Bits
Octets 8 7 6 5 4 3 2 1
1 Type = 77 (decimal)
2 to 3 Length = n
4 Spare Instance
5 DAF DTF HI DFI 01 ISRSI ISRAI SGWCI
6 LS UIMSI CFSI CRSI P PT SI MSV
1 to (n+4) These octet (s) is/ ^re present only if explic itly
specified
Create Session Request 消息中携带该标识指示是否建立 LIPA/SIPTO连接, 该 bit为 1, 表明此连接是 LIPA/SIPTO连接, 该 bit为 0, 表明此连接不使用 LIPA/SIPTO。
Modify Bearer Request消息中携带该标识仅在 LIPA/SIPTO连接 中有效, 如果此时该通路标识为 1, 表明现有的 LIPA/SIPTO连接正 在使用, UE进入连接态, LGW将使用 Direct Tunnel; 如果此时该通 路标识为 0, 则表明现有的 LIPA/SIPTO连接暂不使用, UE进入空闲 态, LGW将使用 S5-U Tunnel。
在 Service Request过程中, SGW透明转发该标识。
在 SI Release过程中, SGW通过收到的 Release Access Bearer Request消息中携带的 LIPA/SIPTO标识,来确定哪些 PDN Connection 需要发送 LS标志位为 0的 Modify Bearer Reqeust消息。
同样, 为了在 SI Release 过程中, 使得 SGW 能够区分用于
LIPA/SIPTO服务的 PDN Connection和普通 PDN Connection, 需用 Release Access Bearer Request消息中携带的 LIPA/SIPTO标识, 可以 在 EBI中增加标识表明哪些 Default Bearer所属的 PDN Connection使 用 LIPA/SIPTO, 如下表所示: Bits
Octets 8 7 6 5 4 3 2 1
1 Type = 73 (decimal)
2 to 3 Length = n
4 Spare Instance
5 Spare (all bits set to LS EPS Bearer ID (EBI)
0)
6 to (n+4) These octet (s) is/ar e present only if explicitly
specified
增加 LS标识位, 该 bit为 1 , 表明此 Default Bearer所属的 PDN Connection连接是 LIPA/SIPTO连接,该 bit为 0,表明此 Default Bearer 所属的 PDN Connection连接不是 LIPA/SIPTO。
LGW的 PDN Connection的 Context 中需要增加标识表明此时 LIPA/SIPTO 连接该使用哪个 Tunnel, 是 Direct Tunnel还是 S5-U Tunnel, 增力。的标识如下表所示:
Figure imgf000011_0001
当 Direct Tunnel indicator有效时, 表明 LGW使用 Direct Tunnel 进行 LIPA/SIPTO数据传输; 当此 indicator无效时, 表明 LGW使用 S5-U Tunnel。
实施例二,
在该实施例中,主要由 SGW在建立 PDN connection时,采用 PDN Connection 的 Context 中携带 LIPA/SIPTO 的标识来标明该 PDN Connection是否在使用 LIPA/SIPTO连接,进而让 SGW通知 PGW如 何进行数据面通路的选择, 适合在 UE状态经常变化的场景中应用, 能够减少信令消息中携带的信息量。
当 UE进入 Connected态时:
UE Requested PDN Connectivity或 Attach过程如图 6所示,其中, 步骤 1 , 4, 5, 6-16 为现有技术, 在此不再赘述, 具体可参考协议 TS23.401 5.10.2, 以下对与本发明有关的步骤进行详细描述。
步骤 2. MME在 Create Session Request消息中携带标识, 表明 此 PDN Connection用于 LIPA/SIPTO连接, SGW收到此标识后, 在 该 PDN Connection的 Context中增加 LIPA/SIPTO标记,标明该 PDN Connection用于 LIPA/SIPTO连接。
步骤 3、 Serving GW向 PGW发送 Create Session Request。 当该 PDN connection用于 LIPA/SIPTO时, PGW就是 LGW, 如果系统采 用特殊 APN来通知 LGW, 则由 LGW 自行判断该连接是否使用于 LIPA/SIPTO , 否则在 Create Session Request消息中携带 LIPA/SIPTO 连接建立标识。
步骤 5a. 当 LGW收到 LIPA/SIPTO连接建立标识时, LGW置该 UE的通路标识为有效, 表明 LGW使用 Direct Tunnel。
步骤 13a.该步骤为可选步骤, 如果该步骤发生, SGW检查收到 的 Modify Bearer Request消息所属的 PDN Connection Context, 此时 该 PDN Connection带有 LIPA/SIPTO标记, SGW向 PGW发送携带 LIPA/SIPTO连接建立标识的 Modify Bearer Request消息, 如果此时 LGW中该 PDN Connection的通路标识为无效, 则需置其为有效。
Service Request过程如图 7所示, 其中, 步骤 1~8, 10, 11 , 12 为现有技术, 在此不再赘述, 具体可参考协议 TS23.401 5.3.4, 以下 对与本发明有关的步骤进行详细描述。
步骤 9.如果 SGW收到的 Modify Bearer Request消息所属的 PDN Connection 带有 LIPA/SIPTO 标记, 则 SGW 向 PGW 发送携带 LIPA/SIPTO连接建立标识的 Modify Bearer Request消息, 表示 UE 进入 Connected态。 步骤 11a. LGW 收到 Modify Bearer Request 消息中携带 LIPA/SIPTO连接建立标识, 在发送 Modify Bearer Response消息后, 将通路标识置为有效, 表明此连接将使用 Direct Tunnel。
当 UE进入 Idle态时:
SI Release过程如图 8所示, 其中, 步骤 1~16为现有技术, 在 此不再赘述, 具体可参考协议 TS23.401 5.3.5, 以下对与本发明有关 的步骤进行详细描述。
步 7a. 当 SGW收到 Release Access Bearer Request消息中的 Default Bearer ID list之后, 查找各个 Default Bearer ID对应的 PDN Connection是否带有 LIPA/SIPTO标识, 如果有, 则向对应的 LGW 发送 Modify Bearer Request消息, 并在该消息中携带 LIPA/SIPTO连 接拆除标识, 然后按现有协议 TS23.4015.3.5中对应步骤 2来处理。
步骤 7b. 当 LGW收到 LIPA/SIPTO连接拆除标识后, 将通路标 识置为无效, 表明此连接将使用 S5/S8-U Tunnel。 同时发送 Modify Bearer Response到 SGW。
在实施例二中,如果系统采用特殊标识来通知 LGW,则在 Create Session Request消息中携带标识,同样,为了在 Modify Bearer Request 消息指示 LIPA/SIPTO连接是否应该存在, 也需要携带标识, 因此可 以在 IE "Indication Flags" 中添加一个指示, 如下表所示:
Bits
Octets 8 7 6 5 4 3 2 1
1 Type = 77 (decimal)
2 to 3 Length = n
4 Spare Instance
5 DAF DTF HI DFI 01 ISRSI ISRAI SGWCI
6 LS UIMSI CFSI CRSI P PT SI MSV
1 to (n+4) These octet (s) is/ ^re present only if explic itly
specified
Create Session Request 消息中携带该标识指示是否建立
LIPA/SIPTO连接, 该 bit为 1, 表明此连接是 LIPA/SIPTO连接, 该 bit为 0, 表明此连接不使用 LIPA/SIPTO。
Modify Bearer Request消息中携带该标识仅在 LIPA/SIPTO连接 中有效,如果此时该通路标识为 1,表明需要使用现有的 LIPA/SIPTO 连接正在使用, UE进入连接态; 如果此时该通路标识为 0, 则表明 现有的 LIPA/SIPTO连接暂不使用, UE进入空闲态。
在 Service Request 过程中, SGW检查收到的 Modify Bearer Request消息所属的 PDN Connection是否带有 LIPA/SIPTO标记, 如 果是,则 SGW在发往 LGW的 Modify Bearer Request消息中置 LS标 识位为 1。
在 SI Release过程中, SGW查找 Release Access Bearer Request 消息中各个 Default Bearer ID 对应的 PDN Connection 是否带有 LIPA/SIPTO 标识, 如果有, 则向对应的 LGW发送 Modify Bearer Request消息, 并在该消息中置 LS标识位为 0。
LGW的 PDN Connection的 Context 中需要增加标识表明此时 LIPA/SIPTO 连接该使用哪个 Tunnel, 是 Direct Tunnel还是 S5-U Tunnel, 增力。的标识如下表所示:
For each PDN Connect ion within the APN:
NOTE: The following entries are repeated for each PDN connect ion within the APN.
IP Address (es) IPv4 address and/or IPv6 prefix
PDN type IPv4, IPv6, or IPv4v6
])i re l Tuiuiei Liidi raor: !ili li:疆 顯聽 ])i r需 ΐϊ漏 i禁謹織纏薩 、 -■纖: m
UP. ■ 11 ;¾^:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;:;^
S-GW Address in Use The IP address of the S-GW currently used for sending
(control plane) control plane signalling.
S-GW TEID for S5/S8 S-GW Tunnel Endpoint Identifier for the S5/S8 interface
(control plane) for the control plane. (For GTP-based S5/S8 only) .
S-GW Address in Use (user The IP address of the S-GW currently used for sending user plane) plane traffic. (For PMIP— based S5/S8 only).
S-GW GRE Key for downlink Serving GW assigned GRE Key for the S5/S8 interface for traffic (user plane) the user plane for downlink traffic. (For PMIP-based S5/S8
only) .
P-GW IP address for S5/S8 P-GW IP address for the S5/S8 for the control plane
(control plane) signalling.
P-GW TEID for S5/S8 P-GW Tunnel Endpoint Identifier for the S5/S8 control
(control plane) plane interface. (For GTP-based S5/S8 only) .
P-GW Address in Use (user The IP address of the P-GW currently used for sending user plane) plane traffic. (For PMIP-based S5/S8 only).
P-GW GRE Key for uplink PDN GW assigned GRE Key for the S5/S8 interface for the traffic (user plane) user lane for uplink traffic. (For PMIP-based S5/S8
only) .
MS Info Change Reporting The MME and/or SGSN serving the UE support (s) procedures support indication for reporting User Location Information and/or User CSG
Information changes.
MS Info Change Reporting Denotes whether the MME and/or the SGSN is/are requested
Act ion to send changes in User Location Information and/or User
CSG Information changes for this bearer.
For User CSG Information, this field denotes separately whether the MME/SGSN are requested to send changes in User
CSG Information for (a) CSG eel Is, (b) hybrid eel Is in which the subscriber is a CSG member, and (c) hybrid eel Is in which the subscriber is not a CSG member, or any
combination of the above.
BCM The negotiated Bearer Control Mode for GERAN/UTRAN.
Default Bearer Identifies the default bearer within the PDN connect ion
by its EPS Bearer Id. The default bearer is the one which is established first within the PDN connection. (For GTP based S5/S8 or for PMIP based S5/S8 if multiple PDN
connections to the same APN are supported) .
EPS PDN Charging The charging characteristics of this PDN connection e.g.
Characteristics normal, prepaid, flat-rate and/or hot billing.
当 Direct Tunnel indicator有效时, 表明 LGW使用 Direct Tunnel 进行 LIPA/SIPTO数据传输; 当此 indicator无效时, 表明 LGW使用 S5-UTunnel。
图 9为本发明实施例根据 UE状态进行数据面通路选择的系统结 构图。 该系统包括 SGW 100和 LGW 200。 SGW 100用于根据判断 UE的状态及连接是否用于 LIPA/SIPTO, 并指示给 LGW 200。 LGW 200用于根据 SGW 100的指示对所述 LGW 200的通路标识的状态进 行设置, 以及根据所述通路标识的状态选择数据面通路。
其中,当 UE进入空闲状态时,通路标识的状态为无效, LGW 200 选择使用 S5/S8-U Tunnel。 当 UE进入连接状态时, 通路标识的状态 为有效, LGW 200选择使用 Direct Tunnel。
在本发明的一个实施例中,该系统还包括 MME300,用于在判断 即将建立的连接用于 LIPA/SIPTO时, 在会话创建请求 Create Session Request消息中携带指示通知 SGW 100, 再由 SGW 100通知 LGW 200, LGW 200将通路标识的状态设置为有效。
在本发明的另一个实施例中,该系统还包括 MME300,用于在根 据 PDN Connection的上下文判断出此连接是 LIPA/SIPTO连接时, MME 300在 Modify Bearer Request消息中增加 LIPA/SIPTO连接建立 标识, 通知 SGW100所述 PDN Connection是用于 LIPA/SIPTO服务, 并由 SGW100通知所述 LGW 200, LGW 200将通路标识的状态设置 为有效。 在本发明的一个实施例中, LGW 200包括设置模块 210和 通路选择模块 220。 设置模块 210用于根据 SGW 100的指示对通路 标识的状态进行设置。通路选择模块 220用于根据通路标识的状态选 择数据面通路。
其中, 当 UE进入空闲状态时, 所述通路标识的状态为无效, 通 路选择模块 220选择使用 S5/S8-U Tunnd。 当 UE进入连接状态时, 通路标识的状态为有效, 通路选择模块 220选择使用 Direct Tunnel。
本发明使用在 LGW中设置通路标识来选择合适的数据面通路, 并提出了控制设置 /清除该通路标识的方法, 因此本发明功能完整, 可完善现有技术的 LIPA/SIPTO架构的不足。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术 人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这 些实施例进行多种变化、 修改、 替换和变型, 本发明的范围由所附权 利要求及其等同限定。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可借助软件加必需的通用硬件平台的方式来实现, 当然也可 以通过硬件,但很多情况下前者是更佳的实施方式。基于这样的理解, 软件产品的形式体现出来, 该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服 务器, 或者网络设备等)执行本发明各个实施例所述的方法。
本领域技术人员可以理解附图只是一个优选实施例的示意图,附 图中的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实 施例描述进行分布于实施例的装置中,也可以进行相应变化位于不同 于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个 模块, 也可以进一步拆分成多个子模块。

Claims

权利要求
1、 一种根据用户设备 UE状态进行数据面通路选择的方法, 其 特征在于, 包括以下步骤:
本地网关 LGW根据服务网关 SGW的指示对所述 LGW的通路 标识的状态进行设置;
所述 LGW根据所述通路标识的状态选择数据面通路。
2、 如权利要求 1所述的方法, 其特征在于, 通路标识的状态包 括: 当所述 UE进入空闲状态时, 所述通路标识的状态为无效; 当所 述 UE进入连接状态时, 所述通路标识的状态为有效;
所述 LGW根据所述通路标识的状态选择数据面通路包括: 当所述通路标识的状态为无效时, 所述 LGW选择使用 S5/S8-U Tunnel;
当所述通路标识的状态为有效时, 所述 LGW选择使用 Direct Tunnel
3、 如权利要求 1或 2所述的方法, 其特征在于, 还包括: 如果移动性管理实体 MME判断待建立的连接用于本地 IP接入
LIPA/选择性 IP分流 SIPTO, 则所述 MME在会话创建请求 Create Session Request消息中携带指示通知所述 SGW, 由所述 SGW通知 LGW, 所述 LGW将通路标识的状态设置为有效; 或者,
如果系统使用特殊接入点名称 APN来通知 LGW, 则 LGW判断 待建立的连接是否用于 LIPA/SIPTO, 如果是, 则所述 LGW将通路 标识的状态设置为有效。
4、 如权利要求 1或 2所述的方法, 其特征在于, 还包括: 当 MME根据 PDN Connection的上下文判断出待建立的连接是 LIPA/SIPTO连接时, 所述 MME在 Modify Bearer Request消息中增 加 LIPA/SIPTO连接建立标识, 通知所述 SGW所述 PDN Connection 用于 LIPA/SIPTO服务, 由所述 SGW通知所述 LGW, 所述 LGW将 通路标识的状态设置为有效。
5、 如权利要求 1或 2所述的方法, 其特征在于, 还包括: 如果是 SI Release 过程中用于 LIPA/SIPTO 服务的 PDN Connection , 贝1 J MME 在释放接入承载请求 Release Access Bearer Request消息中增加 LIPA/SIPTO标识, 并通知给 SGW, 由所述 SGW 通知所述 LGW, 所述 LGW将通路标识的状态设置为无效。
6、 如权利要求 5所述的方法, 其特征在于, 在所述 LGW将通 路标识的状态设置为无效之后, 所述 LGW向所述 SGW发送修改承 载响应 Modify Bearer Response消息。
7、 如权利要求 1或 2所述的方法, 其特征在于, 还包括: 如果 MME判断待建立的连接用于 LIPA/SIPTO, 则所述 MME 在 Create Session Request消息中携带标识以指示 PDN Connection用 于 LIPA/SIPTO连接, 所述 SGW在 PDN Connection的 Context中增 加 LIPA/SIPTO标记,标明该 PDN Connection用于 LIPA/SIPTO连接, 并通知所述 LGW, 所述 LGW将通路标识的状态设置为有效。
8、 如权利要求 1或 2所述的方法, 其特征在于, 还包括: 如果 SGW 收到的 Modify Bearer Request 消息所属的 PDN
Connection 带有 LIPA/SIPTO 标记, 则 SGW 向 PGW 发送携带 LIPA/SIPTO连接建立标识的 Modify Bearer Request消息, 表示 UE 进入 Connected态, 所述 LGW将通路标识的状态设置为有效。
9、 如权利要求 1或 2所述的方法, 其特征在于, 还包括: 当 SGW收到 Release Access Bearer Request消息中的 Default
Bearer ID list之后,查找各个 Default Bearer ID对应的 PDN Connection 是否带有 LIPA/SIPTO标识, 如果有, 则向对应的 LGW发送 Modify Bearer Request消息, 并在该消息中携带 LIPA/SIPTO连接拆除标识, 所述 LGW根据所述 LIPA/SIPTO连接拆除标识将通路标识的状态设 置为无效。
10、一种根据 UE状态进行数据面通路选择的系统,其特征在于, 包括 SGW和 LGW,
所述 SGW , 用于根据判断 UE 的状态及连接是否用于 LIPA/SIPTO, 并指示给所述 LGW; 所述 LGW,用于根据 SGW的指示对所述 LGW的通路标识的状 态进行设置, 以及根据所述通路标识的状态选择数据面通路。
11、 如权利要求 10所述的系统, 其特征在于, 所述通路标识的 状态包括: 当所述 UE进入空闲状态时,所述通路标识的状态为无效; 当所述 UE进入连接状态时, 所述通路标识的状态为有效;
所述 LGW, 用于当所述通路标识的状态为无效时, 选择使用 S5/S8-U Tunnel; 当所述通路标识的状态为有效时, 选择使用 Direct Tunnel
12、 如权利要求 10或 11所述的系统, 其特征在于, 还包括: MME, 用于在判断待建立的连接用于 LIPA/SIPTO时,在会话创 建请求 Create Session Request消息中携带指示通知所述 SGW;
所述 SGW, 用于将待建立的连接用于 LIPA/SIPTO的指示通知 LGW;
所述 LGW, 用于将通路标识的状态设置为有效。
13、 如权利要求 10或 11所述的系统, 其特征在于, 还包括:
MME, 用于当根据 PDN Connection的上下文判断出待建立的连 接是 LIPA/SIPTO 连接时, 在 Modify Bearer Request 消息中增加
LIPA/SIPTO连接建立标识, 通知所述 SGW所述 PDN Connection用 于 LIPA/SIPTO服务;
所述 SGW, 用于通知所述 LGW 所述 PDN Connection 用于
LIPA/SIPTO服务;
所述 LGW, 用于将通路标识的状态设置为有效。
14、 一种 LGW, 其特征在于, 包括设置模块和通路选择模块, 所述设置模块, 用于根据 SGW的指示对通路标识的状态进行设 置;
所述通路选择模块,用于根据所述通路标识的状态选择数据面通 路。
15、 如权利要求 14所述的 LGW, 其特征在于, 所述通路标识的 状态包括: 当所述 UE进入空闲状态时,所述通路标识的状态为无效; 当所述 UE进入连接状态时, 所述通路标识的状态为有效;
所述通路选择模块, 用于当所述通路标识的状态为无效时, 选择 使用 S5/S8-U Tunnel; 当所述通路标识的状态为有效时, 选择使用 Direct TimneL
16、一种根据 UE状态进行数据面通路选择的方法,其特征在于, 包括以下步骤:
当 UE进入空闲态时, LGW选择使用 S5/S8-U Tunnel;
当 UE进入连接态时, LGW选择使用 Direct Tunnel。
17、 如权利要求 16所述的方法, 其特征在于, 该方法进一步包 括:
在 LGW中为 UE设置通路标识 , 当 UE进入空闲态时, 将所述 通路标识置为无效, LGW选择使用 S5/S8-U Tunnel。
18、 如权利要求 16所述的方法, 其特征在于, 该方法进一步包 括:
在 LGW中为 UE设置通路标识, 当 UE进入连接态时, 将所述 通路标识置为有效, LGW选择使用 Direct Tunnel。
PCT/CN2011/071740 2010-03-12 2011-03-11 根据ue状态进行数据面通路选择的方法、系统及装置 WO2011110106A1 (zh)

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