WO2017070857A1 - 一种数据传输的方法及装置 - Google Patents

一种数据传输的方法及装置 Download PDF

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Publication number
WO2017070857A1
WO2017070857A1 PCT/CN2015/093025 CN2015093025W WO2017070857A1 WO 2017070857 A1 WO2017070857 A1 WO 2017070857A1 CN 2015093025 W CN2015093025 W CN 2015093025W WO 2017070857 A1 WO2017070857 A1 WO 2017070857A1
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WO
WIPO (PCT)
Prior art keywords
mme
downlink data
sgw
sent
sending
Prior art date
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PCT/CN2015/093025
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English (en)
French (fr)
Inventor
邓强
张万强
黄正磊
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to KR1020187012336A priority Critical patent/KR102035077B1/ko
Priority to BR112018008224-4A priority patent/BR112018008224B1/pt
Priority to JP2018517361A priority patent/JP6518010B2/ja
Priority to CN201580028555.XA priority patent/CN107079394B/zh
Priority to CN201910172123.6A priority patent/CN109982299B/zh
Priority to EP15906923.6A priority patent/EP3361788B1/en
Priority to PCT/CN2015/093025 priority patent/WO2017070857A1/zh
Publication of WO2017070857A1 publication Critical patent/WO2017070857A1/zh
Priority to US15/963,852 priority patent/US10674448B2/en
Priority to US16/858,340 priority patent/US11368909B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0251—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
    • H04W52/0254—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity detecting a user operation or a tactile contact or a motion of the device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for data transmission.
  • M2M Machine to Machine
  • UE User Equipment
  • M2M Machine to Machine
  • these small data are generally only A few or tens of bytes of M2M devices, such as water meters and electricity meters, only need to interact with the application server for some small data. If the user plane bearer is established only to transmit these small data, it will cause waste of network resources.
  • 3rd Generation Partnership Project (English name: 3rd Generation Partnership Project, 3GPP) studies how to efficiently transfer small data while saving network resources.
  • One method is to transmit small data through a control plane non-access stratum (English name: Non-Access Stratum, English abbreviation: NAS) message, which avoids the signaling overhead caused by the establishment of the user plane, is a kind of An effective method of small data transmission.
  • NAS Non-Access Stratum
  • M2M equipment will adopt some power-saving technologies, such as power-saving mode (English full name: Power Saving Mode, English abbreviation: PSM) and extended discontinuous reception (English full name: extended Discontinuous Reception, English abbreviation: eDRX),
  • PSM Power Saving Mode
  • eDRX extended Discontinuous Reception
  • the foregoing method for transmitting small data by the NAS is performed when the UE is reachable, and does not consider how to transmit downlink small data when the UE adopts the power saving technology and is temporarily unreachable.
  • the UE adopts the power saving technology and is in an unreachable state the UE will not be able to receive the downlink small data, thereby causing the loss of the downlink small data.
  • the present invention provides a data transmission method and apparatus for avoiding downlink data loss.
  • a first aspect of the embodiments of the present invention provides a data transmission method, including:
  • the mobility management entity MME determines that the user equipment UE changes from the unreachable state to the reachable state;
  • the MME sends the downlink data to the UE.
  • the MME includes an original MME and a new MME, where the original MME serving the UE is replaced with the
  • the sending, by the MME, the request message to the serving gateway SGW includes: sending, by the original MME, a request message to the SGW;
  • Receiving the downlink data sent by the SGW by the MME includes: receiving, by the original MME, downlink data sent by the SGW;
  • the method further includes: the original MME transmitting the downlink data to the new MME;
  • the sending, by the MME, the downlink data to the UE includes: sending, by the new MME, the downlink data to the UE.
  • the MME includes an original MME and a new MME, where the original MME serving the UE is replaced with the When the MME sends a request message to the serving gateway SGW, the new MME sends a request message to the SGW.
  • Receiving the downlink data sent by the SGW by the MME includes: receiving, by the new MME, downlink data sent by the SGW;
  • the sending, by the MME, the downlink data to the UE includes: sending, by the new MME, the downlink data to the UE.
  • the mobility management entity MME determines that the user equipment UE changes from the unreachable state to the reachable state, including:
  • the MME receives the non-access stratum NAS message sent by the UE, and determines that the UE is in a reachable state.
  • the method further includes:
  • the MME When the MME determines that the UE changes from the unreachable state to the reachable state, the MME pages the UE;
  • the MME receives a service request message sent by the UE.
  • the method before the MME determines that the UE changes from the unreachable state to the reachable state, the method further includes:
  • the MME determines that the UE is in an unreachable state, and the MME sends a response message to the SGW, where the response message is used to instruct the SGW to cache the downlink data.
  • the response message further includes a cache expiration time, where the cache expiration time is used to indicate the location Describe an expiration time of the downlink data by the SGW;
  • the sending, by the MME, the request message to the SGW includes:
  • the MME determines that the downlink data has not expired, and the MME sends a request message to the SGW.
  • a second aspect of the embodiments of the present invention provides a data transmission method, including:
  • the mobility management entity MME receives a downlink data notification message sent by the serving gateway SGW, where the notification message includes downlink data sent to the user equipment UE;
  • the MME When the UE changes to a reachable state, the MME sends the downlink data to the UE.
  • the method further includes:
  • the MME sets a cache expiration time of the downlink data.
  • the MME sends the downlink data to the UE include:
  • the MME determines that the downlink data is not expired, and the MME sends the downlink data to the UE.
  • the MME includes the original MME and the new MME.
  • the sending, by the MME, the downlink data to the UE includes:
  • the original MME sends the downlink data to the new MME
  • the new MME sends the downlink data to the UE.
  • the method before the sending, by the MME, the downlink data to the UE, the method further includes:
  • the MME receives the non-access stratum NAS message sent by the UE, and determines that the UE is in a reachable state.
  • the method before the sending, by the MME, the downlink data to the UE, the method further includes:
  • the MME receives a service request message sent by the UE.
  • the method further includes:
  • the MME sends an indication message to the SGW, indicating that the downlink data is cached.
  • the indication message further includes a cache expiration time of the downlink data.
  • a third aspect of the embodiments of the present invention provides a data transmission method, including:
  • the serving gateway SGW receives downlink data sent to the user equipment UE;
  • the SGW buffers the downlink data according to the cache indication
  • the cache indication further includes a cache expiration time
  • the method further includes:
  • the SGW sets a cache expiration time of the downlink data according to the cache indication.
  • a fourth aspect of the embodiments of the present invention provides a data transmission method, including:
  • the mobility management entity MME receives the reachability event configured by the application server, where the reachability event is used by the MME to indicate to the application server that the user equipment UE is in a reachable state;
  • the MME When the MME determines that the UE is changed to a reachable state, the MME pages the UE and receives the UE initiates a service request message;
  • the MME receives downlink data sent by the application server
  • the MME sends the downlink data to the UE.
  • the receiving, by the MME, the downlink data sent by the application server includes:
  • the MME receives the downlink data sent by the application server through the serving gateway SGW.
  • a fifth aspect of the embodiments of the present invention provides a mobility management entity MME, including:
  • a processing module configured to determine that the user equipment UE changes from an unreachable state to a reachable state
  • a sending module configured to send a request message to the serving gateway SGW;
  • a receiving module configured to receive downlink data sent by the SGW
  • the sending module is further configured to send the downlink data to the UE.
  • the MME includes an original MME and a new MME, where the original MME serving the UE is replaced with the
  • the sending module is specifically configured to: send, by the original MME, a request message to the SGW;
  • the receiving module is specifically configured to: receive, by the original MME, downlink data sent by the SGW;
  • the sending module is further configured to: send, by the original MME, the downlink data to the new MME;
  • the sending module is further configured to: send, by the new MME, the downlink data to the UE.
  • the MME includes an original MME and a new MME, where the original MME serving the UE is replaced with the
  • the sending module is specifically configured to: send, by the new MME, a request message to the SGW;
  • the receiving module is specifically configured to: receive, by the new MME, downlink data sent by the SGW;
  • the sending module is further configured to: send, by the new MME, the downlink data to the UE.
  • the processing module is specifically used to:
  • the sending module is also used to:
  • the receiving module is further configured to: receive a service request message sent by the UE.
  • the sending module is further configured to:
  • the response message further includes a cache expiration time, where the cache expiration time is used to indicate the location Describe an expiration time of the downlink data by the SGW;
  • the sending module is further configured to:
  • a request message is sent to the SGW.
  • a sixth aspect of the embodiments of the present invention provides a mobility management entity MME, including:
  • a receiving module configured to receive a downlink data notification message sent by the serving gateway SGW, where the notification message includes downlink data sent to the user equipment UE;
  • a processing module configured to determine that the UE is in an unreachable state
  • a storage module configured to cache the downlink data when determining that the UE is in an unreachable state
  • a sending module configured to send the downlink data to the UE when the UE is changed to a reachable state.
  • the processing module is further configured to:
  • the sending module is specifically configured to:
  • the downlink data is sent to the UE.
  • the MME includes an original MME and a new MME.
  • the sending module is specifically configured to:
  • the original MME sends the downlink data to the new MME
  • the new MME sends the downlink data to the UE.
  • the processing module is specifically configured to:
  • the sending module is further configured to:
  • the MME pages the UE;
  • the receiving module is further configured to receive a service request message sent by the UE.
  • the sending module is further configured to:
  • an indication message is sent to the SGW, indicating that the downlink data is cached.
  • the indication message further includes a cache expiration time of the downlink data.
  • a seventh aspect of the embodiments of the present invention provides a serving gateway SGW, including:
  • a receiving module configured to receive downlink data sent to the user equipment UE
  • a sending module configured to send a downlink data notification message to the mobility management entity MME;
  • the receiving module is further configured to receive a cache indication sent by the MME;
  • a storage module configured to cache the downlink data according to the cache indication
  • the receiving module is further configured to receive a request message sent by the MME;
  • the sending module is further configured to send the downlink data to the MME according to the request message, so that the MME sends the downlink data to the UE;
  • a processing module configured to instruct the storage module to cache the downlink data.
  • the cache indication further includes a cache expiration time
  • the processing module is further configured to:
  • An eighth aspect of the embodiments of the present invention provides a mobility management entity MME, including:
  • a receiving module configured to receive a reachability event configured by the application server, where the reachability event is used by the MME to indicate to the application server that the user equipment UE is in a reachable state;
  • the receiving module is further configured to: receive a non-access stratum NAS message sent by the UE, and determine that the UE is in a reachable state; or
  • a sending module configured to send, to the application server, a reachability event report of the UE
  • the receiving module is further configured to receive downlink data sent by the application server;
  • the sending module is further configured to send the downlink data to the UE;
  • a processing module configured to determine a state in which the UE is located.
  • the receiving module is specifically configured to:
  • the data transmission method provided by the embodiment of the present invention includes: the mobility management entity MME determines that the user equipment UE changes from the unreachable state to the reachable state; the MME sends a request message to the serving gateway SGW; and the MME receives the SGW The downlink data that is sent; the MME sends the downlink data to the UE.
  • the MME requests the SGW to send the downlink data, and then the MME sends the downlink data to the UE, so as to prevent the downlink data from being sent to the UE when the UE is in the unreachable state.
  • the loss of data improves the real-time accuracy of the transmission.
  • FIG. 1 is a schematic diagram of a method for data transmission in an embodiment of the present invention
  • FIG. 2 is another schematic diagram of a method for data transmission in an embodiment of the present invention.
  • FIG. 3 is another schematic diagram of a method for data transmission according to an embodiment of the present invention.
  • FIG. 4 is another schematic diagram of a method for data transmission in an embodiment of the present invention.
  • FIG. 5 is another schematic diagram of a method for data transmission according to an embodiment of the present invention.
  • FIG. 6 is another schematic diagram of a method for data transmission according to an embodiment of the present invention.
  • FIG. 7 is another schematic diagram of a method for data transmission according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a mobility management entity MME according to an embodiment of the present invention.
  • FIG. 9 is another schematic diagram of a mobility management entity MME according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a serving gateway SGW according to an embodiment of the present invention.
  • FIG. 11 is another schematic diagram of a mobility management entity MME according to an embodiment of the present invention.
  • FIG. 12 is another schematic diagram of a mobility management entity MME according to an embodiment of the present invention.
  • FIG. 13 is another schematic diagram of a serving gateway SGW according to an embodiment of the present invention.
  • the embodiment of the invention provides a data transmission method and device for avoiding loss of downlink data.
  • an embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the mobility management entity MME determines that the user equipment UE changes from the unreachable state to the reachable state.
  • the downlink data sent to the UE will not be received by the UE, for example, when the machine to the machine (English name: Machine to Machine, English abbreviation: M2M) is in a power saving state, That is, the M2M device is in an unreachable state, and the device is not connected to any device on the network side at this time. Therefore, when the network side sends downlink data to the device, the downlink data will be lost.
  • the UE is in the reachable state, that is, the connection with the network-side device is established, and the device can be received at this time.
  • Downlink data sent to the network side device Since the MME in the network side device has the function of supporting monitoring within the scope permitted by law, the MME is monitored in real time by the MME.
  • the MME sends a request message to a serving gateway SGW.
  • the MME When the MME detects that the UE changes from the unreachable state to the reachable state, the MME can send downlink data to the UE. Since the downlink data can be sent by the application server, it can also be sent by other core network devices. However, no matter who sends the downlink data, it must be forwarded through the SGW. In general, if the UE is in the reachable state, the connection can be directly established with the SGW. When the downlink data is delivered to the SGW, the SGW can directly forward the downlink data to the UE.
  • the SGW cannot send downlink data to the UE, even when the UE changes from the unreachable state to the reachable state, the SGW is also The status of the UE is not known, so the MME needs to obtain the downlink data from the SGW to send the downlink data to the UE. The acquiring, by the MME, the downlink data, and sending a request message to the SGW, to request the SGW to send the downlink data to the MME.
  • the MME receives downlink data sent by the SGW.
  • the SGW After receiving the request message sent by the MME, the SGW sends the downlink data to the MME. It should be noted that the downlink data may be stored by the SGW, or after the SGW receives the request message sent by the MME, the SGW sends a request message to the application server, requesting the application server to send Downstream data.
  • the MME sends the downlink data to the UE.
  • the MME After receiving the downlink data, the MME sends the downlink data to the UE, so that the UE receives the downlink data, and implements a corresponding function according to the downlink data.
  • the data transmission method provided by the embodiment of the present invention includes: the mobility management entity MME determines that the user equipment UE changes from the unreachable state to the reachable state; the MME sends a request message to the serving gateway SGW; and the MME receives the SGW The downlink data that is sent; the MME sends the downlink data to the UE.
  • the MME requests the SGW to send the downlink data, and then the MME sends the downlink data to the UE, so as to prevent the downlink data from being sent to the UE when the UE is in the unreachable state.
  • the loss of data improves the real-time accuracy of the transmission.
  • another embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the original mobility management entity MME determines that the user equipment UE changes from the unreachable state to the reachable state.
  • the MME includes an original MME and a new MME, where the original MME is an MME that serves the UE before the UE moves, and the new MME is after the UE moves.
  • the MME of the UE service Because the original MME is always serving the UE before the UE moves, the state in which the UE is monitored is monitored by the original MME.
  • the data information of the UE stored by the original MME may be acquired by the new MME, and the status of the UE is monitored by the new MME.
  • the original MME sends a request message to the serving gateway SGW.
  • the original MME when the original MME determines that the UE changes from the unreachable state to the reachable state, the original MME first obtains downlink data sent to the UE, so the original MME sends the SGW to the SGW. Send a request message.
  • the new MME when the original MME serving the UE is replaced with a new MME, the new MME directly establishes a connection with the SGW, so the new MME may also send a request message to the SGW. After receiving the downlink data, the new MME may directly send the downlink data to the UE.
  • the original MME receives downlink data sent by the SGW.
  • the original MME sends the downlink data to the new MME.
  • the original MME serving the UE Since the original MME serving the UE has been replaced with a new MME, the original MME can no longer send data information to the UE. Therefore, after the original MME receives the downlink data sent by the SGW, it needs to The downlink data is sent to the new MME, and the downlink data is sent by the new MME to the UE.
  • the new MME sends the downlink data to the UE.
  • the UE when the UE generates the mobility in the unreachable state, and the UE is caused by the UE.
  • the original MME of the service is changed to the new MME, the original MME determines that the UE changes from the unreachable state to the reachable state, and then obtains downlink data from the SGW through the original MME, and the original MME sends the downlink data to the
  • the new MME is configured to send the downlink data to the UE by the new MME.
  • the new MME directly establishes a connection with the SGW, and the new MME determines that the UE changes from the unreachable state to the reachable state.
  • the new MME obtains the downlink data from the SGW, and then sends the downlink data to the UE. Regardless of the implementation manner described above, when the MME serving the UE changes, the downlink data can be sent to the UE in time, which improves the stability of data transmission.
  • another embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the MME determines that the UE is in an unreachable state, and the MME sends a response message to the SGW, where the response message is used to instruct the SGW to cache the downlink data, and the response message further includes a cache expiration time.
  • the buffer expiration time is used to indicate that the SGW caches an expiration time of the downlink data.
  • the SGW is unable to monitor the state of the UE.
  • the SGW receives the downlink data sent by the application server, the SGW cannot send the downlink data to the UE in the unreachable state, so the SGW sends the downlink.
  • the data notification message is sent to the MME, indicating that downlink data is released, and needs to be sent to the UE.
  • the MME determines that the UE is in an unreachable state. To prevent the downlink data from being lost, the MME sends a response message to the SGW, instructing the SGW to first cache the downlink data.
  • the downlink data may be out of alignment, and the buffer space of the SGW is limited.
  • the network side sends more downlink data to the network.
  • the SGW may not be cached, so the response message further includes a buffer expiration time of the downlink data, and when the buffering time of the downlink data is exceeded, and still not sent to the UE, the The SGW may discard the downlink data or wait for the new downlink data to be received instead of the original downlink data.
  • the MME receives a non-access stratum NAS message sent by the UE, and determines that the UE is in a reachable state.
  • the foregoing embodiment describes that when the MME monitors that the UE changes from the unreachable state to the reachable state, the MME actively acquires the downlink data, and sends the downlink data to the UE.
  • the UE when the UE changes from the unreachable state to the reachable state, the UE also The non-access stratum NAS message may be sent to the MME, for example, a tracking area update (English name: Tracking Area Update, English abbreviation: TAU) message, to indicate that the UE is in a reachable state.
  • a tracking area update English name: Tracking Area Update, English abbreviation: TAU
  • the MME may also page the UE; after receiving the paging sent by the MME, the UE may The MME sends a service request message to update the service data, so the MME receives the service request message sent by the UE;
  • the MME determines that the downlink data is not expired, and the MME sends a request message to the SGW.
  • the MME After the MME receives the service request message sent by the UE, the MME needs to send a request message to the SGW to request the SGW to be located, because the downlink data is still cached in the SGW. Sending the downlink data to the MME, in order to ensure that the SGW still caches the downlink data, or confirms that the habit data is still valid, before the MME sends the request message, the MME needs to determine the The downlink data has not expired.
  • the MME receives downlink data sent by the SGW.
  • the MME sends the downlink data to the UE.
  • the MME determines that the UE is in an unreachable state, and the MME sends a response message to the SGW, instructing the SGW to cache the downlink data, and setting a cache.
  • the expiration time in this way, avoids the loss of downlink data and ensures the real-time accuracy of downlink data.
  • the UE When the UE changes from the unreachable state to the reachable state, the UE sends a NAS message to the MME, so that the MME determines that the UE is in a reachable state, and the MME obtains downlink data from the SGW, and then The downlink data is sent to the UE, so that the UE receives the downlink data in time, which improves the accuracy of data transmission.
  • another embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the mobility management entity MME receives a downlink data notification message sent by the serving gateway SGW, where the notification message includes downlink data that is sent to the user equipment UE.
  • the SGW When the SGW receives the downlink data sent to the UE by the application server, and finds that the UE cannot establish a connection with the SGW, the SGW sends a downlink data notification message to the MME. And indicating that the downlink data sent to the UE is reached, and sending the downlink data to the MME by using the downlink data notification message.
  • the MME determines that the UE is in an unreachable state, and the MME caches the downlink data.
  • the MME determines the state of the UE, and determines that the MME caches the downlink data when the UE is in an unreachable state.
  • the UE may send the downlink data to the UE when the UE is changed to the reachable state.
  • the MME sends the downlink data to the UE.
  • the MME when the UE is in an unreachable state, the MME receives the downlink data sent by the SGW. To avoid the loss of the downlink data, the MME caches the downlink data, and the UE is changed to be When the state is reached, the MME sends the downlink data to the UE, so that the UE receives the downlink data in time, which improves the real-time performance of data transmission.
  • another embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the mobility management entity MME receives a downlink data notification message sent by the serving gateway SGW, where the notification message includes downlink data that is sent to the user equipment UE.
  • the MME determines that the UE is in an unreachable state, and the MME caches the downlink data.
  • the MME sets a cache expiration time of the downlink data.
  • the SGW caches the downlink data and sets the cache expiration time of the downlink data.
  • the MME may also cache the downlink data and set the downlink data. The cache expiration time of the downlink data.
  • the MME sends an indication message to the SGW, indicating that the downlink data is cached, and the indication message further includes a cache expiration time of the downlink data.
  • the SGW when the SGW receives the downlink data, if the SGW cannot send the downlink data to the UE, it sends a downlink data notification message to the UE, when the MME When the downlink data is already buffered, the buffer expiration time of the downlink data is sent to the SGW by using an indication message, and the SGW receives the downlink sent by the application server again during the buffer expiration time of the downlink data. In the case of data, the SGW does not need to send a downlink data notification message to the MME again, because the MME still caches downlink data, so when the MME determines that the UE changes to a reachable state, it will promptly The UE establishes a connection.
  • the SGW may directly send the downlink data to the MME, so that the MME performs the MME.
  • the cache may also cache newly received downlink data by the SGW.
  • the MME receives a non-access stratum NAS message sent by the UE, and determines that the UE is in a reachable state.
  • the MME determines that the downlink data is not expired, and the MME sends the downlink data to the UE.
  • the MME when the UE is in the unreachable state, the MME may be configured to change, so in the embodiment of the present invention, the MME may include the original MME and the new MME.
  • the sending, by the MME, the downlink data to the UE includes: sending, by the original MME, the downlink data to the new MME; The new MME sends the downlink data to the UE.
  • the SGW after the SGW receives the downlink data sent to the UE, the downlink data cannot be directly sent to the UE, and the SGW sends the downlink data to the MME, where the MME determines the When the UE is in an unreachable state, the downlink data is buffered, and the buffer expiration time of the downlink data is set, thereby improving the effectiveness of the downlink data.
  • the UE When the UE is changed to the reachable state, the UE sends a service request message to the MME, and the MME determines whether the downlink data is expired, and if not, sends the downlink data to the UE. Improve the real-time nature of data transmission.
  • FIG. 6 another embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the serving gateway SGW receives downlink data that is sent to the user equipment UE.
  • All downlink data sent by the application server to the UE needs to be forwarded by the SGW, so Before the downlink data is sent to the UE, the SGW receives the downlink data first.
  • the SGW sends a downlink data notification message to the mobility management entity MME.
  • the SGW When the SGW receives the downlink data sent to the UE by the application server, and finds that the UE cannot establish a connection with the SGW, the SGW sends a downlink data notification message to the MME, indicating that there is a downlink to the UE. The data is reached.
  • the SGW receives a cache indication sent by the MME.
  • the SGW buffers the downlink data according to the buffer indication.
  • the cache indication further includes a cache expiration time
  • the method further includes:
  • the SGW sets a cache expiration time of the downlink data according to the cache indication.
  • the SGW receives a request message sent by the MME.
  • the SGW sends the downlink data to the MME according to the request message, so that the MME sends the downlink data to the UE.
  • another embodiment of a method for data transmission in an embodiment of the present invention includes:
  • the mobility management entity MME receives a reachability event configured by the application server, where the reachability event is used by the MME to indicate to the application server that the user equipment UE is in a reachable state.
  • an event is an action that can be recognized by a control, such as pressing an OK button, selecting a radio button or a check box.
  • a control has its own recognizable events, such as loading, clicking, double-clicking, etc. of the form, and text change events of the edit box (text box).
  • the application server first sends downlink data to the SGW when the UE is in a reachable state or an unreachable state. If the UE is in an unreachable state, the SGW caches the downlink data or is cached by the MME. And the downlink data, when the UE is changed to a reachable state, the MME sends the downlink data to the UE.
  • the application server may determine whether the UE is in a reachable state before sending the downlink data, and then send downlink data to the UE when the UE is in a reachable state, because the MME has The function of the UE is monitored, so the application server may first set a reachability event to the MME, and when the MME determines that the UE is in a reachable state, trigger the reachability event, and Application service The device indicates that the user equipment UE is in a reachable state.
  • the MME receives the non-access stratum NAS message sent by the UE, and determines that the UE is in a reachable state; or, when the MME determines that the UE is changed to a reachable state, the MME paging station Determining the UE and receiving the UE to initiate a service request message;
  • the MME sends a reachability event report of the UE to the application server.
  • the MME When the MME determines that the UE is changed to the reachable state, the MME sends a reachability event report of the UE to the application server, to indicate that the application server can send downlink data to the UE. .
  • the MME receives downlink data sent by the application server.
  • the MME receives the downlink data sent by the application server by using the serving gateway SGW; when the application server receives the reachability event report sent by the MME, the application server can send the downlink data to The SGW, when the SGW receives the downlink data, sends the downlink data to the MME, to forward the downlink data to the UE by using the MME.
  • the MME sends the downlink data to the UE.
  • the application server sets a reachability event for the MME, and only when the MME determines that the UE is in the reachable state, the MME sends a reachability event report to the application server, so that the The application server sends the downlink data to the UE, so that the downlink data is guaranteed to be the most real-time data, and the real-time performance of the data transmission is improved.
  • an embodiment of the mobility management entity MME in the embodiment of the present invention includes:
  • the processing module 801 is configured to determine that the user equipment UE changes from the unreachable state to the reachable state;
  • the sending module 802 is configured to send a request message to the serving gateway SGW.
  • the receiving module 803 is configured to receive downlink data sent by the SGW.
  • the sending module 802 is further configured to send the downlink data to the UE;
  • the MME includes an original MME and a new MME, and when the original MME serving the UE is replaced by the new MME, the sending module 802 is specifically configured to: the original MME to the SGW Sending a request message;
  • the receiving module 803 is specifically configured to: receive, by the original MME, downlink data sent by the SGW;
  • the sending module 802 is further configured to: send, by the original MME, the downlink data to the new MME;
  • the sending module 802 is further configured to: send, by the new MME, the downlink data to the UE;
  • the MME includes an original MME and a new MME, and when the original MME serving the UE is replaced by the new MME, the sending module 802 is specifically configured to: the new MME to the SGW Sending a request message;
  • the receiving module 803 is specifically configured to: receive, by the new MME, downlink data sent by the SGW;
  • the sending module 802 is further configured to: send, by the new MME, the downlink data to the UE.
  • the processing module 801 is specifically configured to: when receiving the non-access stratum NAS message sent by the UE, determine that the UE is in a reachable state.
  • the sending module 802 is further configured to: before sending the request message to the SGW, when the UE is determined to change from the unreachable state to the reachable state, paging the UE;
  • the receiving module 803 is further configured to: receive a service request message sent by the UE;
  • the sending module 802 is further configured to: before determining that the UE changes from the unreachable state to the reachable state, when determining that the UE is in an unreachable state, sending a response message to the SGW, where the response message is sent And configured to instruct the SGW to cache the downlink data.
  • the response message further includes a cache expiration time, where the cache expiration time is used to indicate The SGW buffers an expiration time of the downlink data;
  • the sending module 802 is further configured to: when determining that the downlink data is not expired, send a request message to the SGW;
  • another embodiment of the mobility management entity MME in the embodiment of the present invention includes:
  • the receiving module 901 is configured to receive a downlink data notification message sent by the serving gateway SGW, where the notification message includes downlink data that is sent to the user equipment UE.
  • the processing module 902 is configured to determine that the UE is in an unreachable state
  • the storage module 903 is configured to cache the downlink data when determining that the UE is in an unreachable state
  • the sending module 904 is configured to send the downlink data to the UE when the UE is changed to a reachable state
  • the processing module 902 is further configured to: after buffering the downlink data, set a cache expiration time of the downlink data.
  • the sending module 904 is specifically configured to: when determining that the downlink data is not expired, send the downlink data to the UE.
  • the MME includes an original MME and a new MME, and when the original MME serving the UE is replaced by the new MME, the sending module 904 is specifically configured to:
  • the original MME sends the downlink data to the new MME
  • processing module 902 is specifically configured to:
  • the sending module 904 is further configured to: before sending the downlink data to the UE, When it is determined that the UE is changed to a reachable state, the MME pages the UE;
  • the receiving module 901 is further configured to receive a service request message sent by the UE.
  • the sending module 904 is further configured to: after buffering the downlink data, send an indication message to the SGW, indicating that the downlink data is cached.
  • the indication message further includes a cache expiration time of the downlink data.
  • an embodiment of the serving gateway SGW in the embodiment of the present invention includes:
  • the receiving module 1001 is configured to receive downlink data that is sent to the user equipment UE.
  • the sending module 1002 is configured to send a downlink data notification message to the mobility management entity MME.
  • the receiving module 1001 is further configured to receive a cache indication sent by the MME.
  • the storage module 1003 is configured to cache the downlink data according to the cache indication.
  • the receiving module 1001 is further configured to receive a request message sent by the MME;
  • the sending module 1002 is further configured to send the downlink data to the MME according to the request message, so that the MME sends the downlink data to the UE;
  • the processing module 1004 is configured to instruct the storage module 1003 to buffer the downlink data.
  • the cache indication further includes a cache expiration time
  • the processing module 1004 is further configured to: after buffering the downlink data according to the cache indication, set a cache expiration time of the downlink data according to the cache indication.
  • another embodiment of the mobility management entity MME in the embodiment of the present invention includes:
  • the receiving module 1101 is configured to receive a reachability event configured by the application server, where the reachability event is used by the MME to indicate to the application server that the user equipment UE is in a reachable state;
  • the receiving module 1101 is further configured to receive a non-access stratum NAS message sent by the UE, Determining that the UE is in a reachable state; or,
  • the sending module 1102 is configured to send, to the application server, a reachability event report of the UE.
  • the receiving module 1101 is further configured to receive downlink data sent by the application server;
  • the sending module 1102 is further configured to send the downlink data to the UE;
  • the processing module 1103 is configured to determine a state in which the UE is located.
  • the receiving module 1101 is specifically configured to: receive downlink data sent by the application server by using a serving gateway SGW;
  • FIG. 12 is another schematic structural diagram of a mobility management entity MME according to an embodiment of the present invention.
  • the MME may include at least one receiver 1201, at least one transmitter 1202, at least one processor 1203, and a memory 1204.
  • the MME may have more or less components than those shown in FIG. 12, may combine two or more components, or may have different component configurations or settings, and each component may include one Hardware, software, or a combination of hardware and software, including multiple signal processing and/or application specific integrated circuits.
  • the transmitter 1202 can implement the functions of the sending module 802, the sending module 904 described in the embodiment of FIG. 9, and the sending module 1102 described in the embodiment of FIG.
  • the receiver 1201 can implement the functions of the receiving module 803 described in the embodiment of FIG. 8 , the receiving module 901 described in the embodiment of FIG. 9 , and the receiving module 1101 described in the embodiment of FIG. 11;
  • the processor 1203 can implement the functions of the processing module 801 described in the embodiment of FIG. 8, the processing module 902 in the embodiment of FIG. 9, and the processing module 1103 described in the embodiment of FIG.
  • the memory 1204 can implement the functions of the storage module 903 in the embodiment of FIG.
  • FIG. 13 is another schematic structural diagram of a serving gateway SGW according to an embodiment of the present invention.
  • the SGW can include at least one receiver 1301, at least one transmitter 1302, at least one processor 1303, and a memory 1304.
  • the SGW according to an embodiment of the present invention may have more or less components than those shown in FIG. 13, may combine two or more components, or may have different component configurations or settings, and each component may include one Hardware, software, or a combination of hardware and software, including multiple signal processing and/or application specific integrated circuits.
  • the transmitter 1302 can implement the function of the sending module 1002 described in the embodiment of FIG. 10;
  • the receiver 1301 can implement the functions of the receiving module 1001 described in the embodiment of FIG. 10;
  • the processor 1303 can implement the functions of the processing module 1004 described in the embodiment of FIG.
  • the memory 1304 can implement the functions of the storage module 1003 in the embodiment of FIG.

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Abstract

本发明实施例所提供的数据传输的方法包括：移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；所述MME向服务网关SGW发送请求消息；所述MME接收所述SGW发送的下行数据；所述MME将所述下行数据发送给所述UE。这样，当UE变更下行数据可达状态时，MME才向SGW请求发送下行数据，再由MME将下行数据发送给UE，避免了UE处于不可达状态时，下行数据下发至UE而造成的下行数据的丢失，提高了传输的实时准确性。

Description

一种数据传输的方法及装置 技术领域
本发明涉及通信领域，尤其涉及一种数据传输的方法及装置。
背景技术
与传统的用户设备(英文全称：User Equipment，英文缩写：UE)应用不同，许多机器与机器(英文全称：Machine to Machine，英文缩写：M2M)应用只接收和发送小数据，这些小数据一般只有几个或者几十个字节，例如水表和电表的M2M设备，只需要和应用服务器交互一些小数据。如果只是为了传输这些小数据而建立用户面承载，将造成网络资源的浪费。第三代合作伙伴计划(英文全称：3rd Generation Partnership Project，英文缩写：3GPP)研究了如何在节省网络资源的情况下高效的传输小数据。其中一种方法是通过控制面非接入层(英文全称：Non-Access Stratum，英文缩写：NAS)消息来传输小数据，该方法避免了建立用户面所带来的信令开销，是一种有效的小数据传输方法。
为节省电量，M2M设备会采用一些节电技术，如节电模式(英文全称：Power Saving Mode，英文缩写：PSM)和扩展的非连续接收(英文全称：extended Discontinuous Reception，英文缩写：eDRX)，当M2M设备启动节电功能时，将暂时处于不可达状态，下行数据将无法发送给M2M设备。对于采用节电功能的M2M设备，如何进行有效的下行小数据传输是需要解决的问题。
上述现有技术的NAS传输小数据的方法都是在UE可达的情况下进行的，没有考虑UE采用节电技术而处于暂时不可达状态时如何传输下行小数据。当UE采用节电技术而处于不可达状态时，UE将无法接收下行的小数据，从而导致下行小数据的丢失。
发明内容
有鉴于此，本发明提供了用于一种避免下行数据丢失的数据传输方法及装置。
本发明实施例第一方面提供一种数据传输的方法，包括：
移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；
所述MME向服务网关SGW发送请求消息；
所述MME接收所述SGW发送的下行数据；
所述MME将所述下行数据发送给所述UE。
结合本发明实施例第一方面，在本发明实施例第一方面的第一种实现方式中，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述MME向服务网关SGW发送请求消息包括：所述原MME向所述SGW发送请求消息；
所述MME接收所述SGW发送的下行数据包括：所述原MME接收所述SGW发送的下行数据；
所述方法还包括：所述原MME将所述下行数据发送给所述新MME；
所述MME将所述下行数据发送给所述UE包括：所述新MME将所述下行数据发送给所述UE。
结合本发明实施例第一方面，在本发明实施例第一方面的第二种实现方式中，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述MME向服务网关SGW发送请求消息包括：所述新MME向所述SGW发送请求消息；
所述MME接收所述SGW发送的下行数据包括：所述新MME接收所述SGW发送的下行数据；
所述MME将所述下行数据发送给所述UE包括：所述新MME将所述下行数据发送给所述UE。
结合本发明实施例第一方面、第一方面的第一种实现方式以及第一方面的第二种实现方式任意一种，在本发明实施例第一方面的第三种实现方式中，所述移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态包括：
所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态。
结合本发明实施例第一方面、第一方面的第一种实现方式以及第一方面的第二种实现方式任意一种，在本发明实施例第一方面的第四种实现方式中，所述MME向所述SGW发送请求消息之前，所述方法还包括：
当所述MME确定所述UE从不可达状态变更为可达状态时，所述MME寻呼所述UE；
所述MME接收所述UE发送的业务请求消息。
结合本发明实施例第一方面、第一方面的第一种实现方式、第一方面的第二种实现方式、第一方面的第三种实现方式以及第一方面的第四种实现方式任意一种，在本发明实施例第一方面的第五种实现方式中，在所述MME确定UE从不可达状态变更为可达状态之前，所述方法还包括：
所述MME确定所述UE处于不可达状态，所述MME向所述SGW发送响应消息，所述响应消息用于指示所述SGW对所述下行数据进行缓存。
结合本发明实施例第一方面的第五种实现方式，在本发明实施例第一方面的第六种实现方式中，所述响应消息还包括缓存过期时间，所述缓存过期时间用于指示所述SGW缓存所述下行数据的过期时间；
结合本发明实施例第一方面、第一方面的第一种实现方式、第一方面的第二种实现方式、第一方面的第三种实现方式、第一方面的第四种实现方式以及第一方面的第五种实现方式任意一种，在本发明实施例第一方面的第七种实现方式中，所述MME向所述SGW发送请求消息包括：
所述MME确定所述下行数据未过期，所述MME向所述SGW发送请求消息。
本发明实施例第二方面提供一种数据传输的方法，包括：
移动性管理实体MME接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
所述MME确定所述UE处于不可达状态，所述MME缓存所述下行数据；
当所述UE变更为可达状态时，所述MME将所述下行数据发送给所述UE。
结合本发明实施例第二方面，在本发明实施例第二方面的第一种实现方式中，所述MME缓存所述下行数据之后，所述方法还包括：
所述MME设置所述下行数据的缓存过期时间。
结合本发明实施例第二方面或第二方面的第一种实现方式，在本发明实施例第二方面的第二种实现方式中，所述MME将所述下行数据发送给所述UE 包括：
所述MME确定所述下行数据未过期，所述MME将所述下行数据发送给所述UE。
结合本发明实施例第二方面、第二方面的第一种实现方式以及第二方面的第二种实现方式任意一种，在本发明实施例第二方面的第三种实现方式中，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述MME将所述下行数据发送给所述UE包括：
所述原MME将所述下行数据发送给所述新MME；
所述新MME将所述下行数据发送给所述UE。
结合本发明实施例第二方面、第二方面的第一种实现方式、第二方面的第二种实现方式以及第二方面的第三种实现方式任意一种，在本发明实施例第二方面的第四种实现方式中，所述MME将所述下行数据发送给所述UE之前，所述方法还包括：
所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态。
结合本发明实施例第二方面、第二方面的第一种实现方式、第二方面的第二种实现方式以及第二方面的第三种实现方式任意一种，在本发明实施例第二方面的第五种实现方式中，所述MME将所述下行数据发送给所述UE之前，所述方法还包括：
所述MME确定所述UE变更为可达状态，所述MME寻呼所述UE；
所述MME接收所述UE发送的业务请求消息。
结合本发明实施例第二方面、第二方面的第一种实现方式、第二方面的第二种实现方式、第二方面的第三种实现方式、第二方面的第四种实现方式以及第二方面的第五种实现方式任意一种，在本发明实施例第二方面的第六种实现方式中，所述MME缓存所述下行数据之后，所述方法还包括：
所述MME向所述SGW发送指示消息，指示所述下行数据已缓存。
结合本发明实施例第二方面的第六种实现方式，在本发明实施例中第二方面的第七种实现方式中，所述指示消息还包括所述下行数据的缓存过期时间。
本发明实施例第三方面提供一种数据传输的方法，包括：
服务网关SGW接收发往用户设备UE的下行数据；
所述SGW向移动性管理实体MME发送下行数据通知消息；
所述SGW接收所述MME发送的缓存指示；
所述SGW根据所述缓存指示缓存所述下行数据；
所述SGW接收所述MME发送的请求消息；
所述SGW根据所述请求消息将所述下行数据发送给所述MME，以使得所述MME将所述下行数据发送给所述UE。
结合本发明实施例第三方面，在本发明实施例第三方面的第一种实现方式中，所述缓存指示还包括缓存过期时间；
所述SGW根据所述缓存指示缓存所述下行数据之后，所述方法还包括：
所述SGW根据所述缓存指示设置所述下行数据的缓存过期时间。
本发明实施例第四方面提供一种数据传输的方法，包括：
移动性管理实体MME接收应用服务器配置的可达性事件，所述可达性事件用于所述MME向所述应用服务器指示用户设备UE为可达状态；
所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；或者，
当所述MME确定所述UE变更为可达状态时，所述MME寻呼所述UE并接收所述UE发起业务请求消息；
所述MME向所述应用服务器发送所述UE的可达性事件报告；
所述MME接收来自所述应用服务器发送的下行数据；
所述MME将所述下行数据发送给所述UE。
结合本发明实施例第四方面，在本发明实施例第四方面的第一种实现方式中，所述MME接收所述应用服务器发送的下行数据包括：
所述MME通过服务网关SGW接收所述应用服务器发送的下行数据。
本发明实施例第五方面提供一种移动性管理实体MME，包括：
处理模块，用于确定用户设备UE从不可达状态变更为可达状态；
发送模块，用于向服务网关SGW发送请求消息；
接收模块，用于接收所述SGW发送的下行数据；
所述发送模块还用于，将所述下行数据发送给所述UE。
结合本发明实施例第五方面，在本发明实施例第五方面的第一种实现方式中，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块具体用于：所述原MME向所述SGW发送请求消息；
所述接收模块具体用于：所述原MME接收所述SGW发送的下行数据；
所述发送模块还用于：所述原MME将所述下行数据发送给所述新MME；
所述发送模块还用于：所述新MME将所述下行数据发送给所述UE。
结合本发明实施例第五方面，在本发明实施例第五方面的第二种实现方式中，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块具体用于：所述新MME向所述SGW发送请求消息；
所述接收模块具体用于：所述新MME接收所述SGW发送的下行数据；
所述发送模块还用于：所述新MME将所述下行数据发送给所述UE。
结合本发明实施例第五方面、第五方面的第一种实现方式以及第五方面的第二种实现方式任意一种，在本发明实施例第五方面的第三种实现方式中，所述处理模块具体用于：
当接收所述UE发送的非接入层NAS消息时，确定所述UE处于可达状态。
结合本发明实施例第五方面、第五方面的第一种实现方式以及第五方面的第二种实现方式任意一种，在本发明实施例第五方面的第四种实现方式中，所述发送模块还用于：
向所述SGW发送请求消息之前，当确定所述UE从不可达状态变更为可达状态时，寻呼所述UE；
所述接收模块还用于：接收所述UE发送的业务请求消息。
结合本发明实施例第五方面、第五方面的第一种实现方式、第五方面的第二种实现方式、第五方面的第三种实现方式以及第五方面的第四种实现方式任意一种，在本发明实施例第五方面的第五种实现方式中，所述发送模块还用于：
在确定UE从不可达状态变更为可达状态之前，当确定所述UE处于不可达状态时，向所述SGW发送响应消息，所述响应消息用于指示所述SGW对 所述下行数据进行缓存。
结合本发明实施例第五方面的第五种实现方式，在本发明实施例第五方面的第六种实现方式中，所述响应消息还包括缓存过期时间，所述缓存过期时间用于指示所述SGW缓存所述下行数据的过期时间；
结合本发明实施例第五方面、第五方面的第一种实现方式、第五方面的第二种实现方式、第五方面的第三种实现方式、第五方面的第四种实现方式以及第五方面的第五种实现方式任意一种，在本发明实施例第五方面的第七种实现方式中，所述发送模块具体还用于：
当确定所述下行数据未过期时，向所述SGW发送请求消息。
本发明实施例第六方面提供一种移动性管理实体MME，包括：
接收模块，用于接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
处理模块，用于确定所述UE处于不可达状态；
存储模块，用于当确定所述UE处于不可达状态时，缓存所述下行数据；
发送模块，用于当所述UE变更为可达状态时，将所述下行数据发送给所述UE。
结合本发明实施例第六方面，在本发明实施例第六方面的第一种实现方式中，所述处理模块还用于：
在缓存所述下行数据之后，设置所述下行数据的缓存过期时间。
结合本发明实施例第六方面或第六方面的第一种实现方式，在本发明实施例第六方面的第二种实现方式中，所述发送模块具体用于：
当确定所述下行数据未过期时，将所述下行数据发送给所述UE。
结合本发明实施例第六方面、第六方面的第一种实现方式以及第六方面的第二种实现方式任意一种，在本发明实施例第六方面的第三种实现方式中，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块具体用于：
所述原MME将所述下行数据发送给所述新MME；
所述新MME将所述下行数据发送给所述UE。
结合本发明实施例第六方面、第六方面的第一种实现方式、第六方面的第 二种实现方式以及第六方面的第三种实现方式任意一种，在本发明实施例第六方面的第四种实现方式中，所述处理模块具体用于：
当接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态。
结合本发明实施例第六方面、第六方面的第一种实现方式、第六方面的第二种实现方式以及第六方面的第三种实现方式任意一种，在本发明实施例第六方面的第五种实现方式中，所述发送模块还用于：
将所述下行数据发送给所述UE之前，当确定所述UE变更为可达状态时，所述MME寻呼所述UE；
所述接收模块还用于接收所述UE发送的业务请求消息。
结合本发明实施例第六方面、第六方面的第一种实现方式、第六方面的第二种实现方式、第六方面的第三种实现方式、第六方面的第四种实现方式以及第六方面的第五种实现方式任意一种，在本发明实施例第六方面的第六种实现方式中，所述发送模块还用于：
缓存所述下行数据之后，向所述SGW发送指示消息，指示所述下行数据已缓存。
结合本发明实施例第六方面的第六种实现方式，在本发明实施例中第六方面的第七种实现方式中，所述指示消息还包括所述下行数据的缓存过期时间。
本发明实施例第七方面提供一种服务网关SGW，包括：
接收模块，用于接收发往用户设备UE的下行数据；
发送模块，用于向移动性管理实体MME发送下行数据通知消息；
所述接收模块还用于，接收所述MME发送的缓存指示；
存储模块，用于根据所述缓存指示缓存所述下行数据；
所述接收模块还用于，接收所述MME发送的请求消息；
所述发送模块还用于，根据所述请求消息将所述下行数据发送给所述MME，以使得所述MME将所述下行数据发送给所述UE；
处理模块，用于指示所述存储模块缓存所述下行数据。
结合本发明实施例第七方面，在本发明实施例第七方面的第一种实现方式中，所述缓存指示还包括缓存过期时间；
所述处理模块还用于：
在根据所述缓存指示缓存所述下行数据之后，根据所述缓存指示设置所述下行数据的缓存过期时间。
本发明实施例第八方面提供一种移动性管理实体MME，包括：
接收模块，用于接收应用服务器配置的可达性事件，所述可达性事件用于所述MME向所述应用服务器指示用户设备UE为可达状态；
所述接收模块还用于，接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；或者，
当确定所述UE变更为可达状态时，寻呼所述UE并接收所述UE发起业务请求消息；
发送模块，用于向所述应用服务器发送所述UE的可达性事件报告；
所述接收模块还用于，接收来自所述应用服务器发送的下行数据；
所述发送模块还用于，将所述下行数据发送给所述UE；
处理模块，用于确定所述UE所处的状态。
结合本发明实施例第八方面，在本发明实施例第八方面的第一种实现方式中，所述接收模块具体用于：
通过服务网关SGW接收所述应用服务器发送的下行数据。
本发明实施例所提供的数据传输的方法包括：移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；所述MME向服务网关SGW发送请求消息；所述MME接收所述SGW发送的下行数据；所述MME将所述下行数据发送给所述UE。这样，当UE变更下行数据可达状态时，MME才向SGW请求发送下行数据，再由MME将下行数据发送给UE，避免了UE处于不可达状态时，下行数据下发至UE而造成的下行数据的丢失，提高了传输的实时准确性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术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发明的一些实施例，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为本发明实施例中数据传输的方法的一个示意图；
图2为本发明实施例中数据传输的方法的另一示意图；
图3为本发明实施例中数据传输的方法的另一示意图；
图4为本发明实施例中数据传输的方法的另一示意图；
图5为本发明实施例中数据传输的方法的另一示意图；
图6为本发明实施例中数据传输的方法的另一示意图；
图7为本发明实施例中数据传输的方法的另一示意图；
图8为本发明实施例中移动性管理实体MME的一个示意图；
图9为本发明实施例中移动性管理实体MME的另一示意图；
图10为本发明实施例中服务网关SGW的一个示意图；
图11为本发明实施例中移动性管理实体MME的另一示意图；
图12为本发明实施例中移动性管理实体MME的另一示意图；
图13为本发明实施例中服务网关SGW的另一示意图。
具体实施方式
本发明实施例提供了一种数据传输的方法及装置，用于避免下行数据的丢失。
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参照图1所示，本发明实施例中数据传输的方法的一个实施例包括：
101、移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；
当用户设备UE处于不可达状态时，发往所述UE的下行数据将不能被所述UE接收，比如机器到机器(英文全称：Machine to Machine，英文缩写：M2M)设备处于节电状态时，即M2M设备为不可达状态，该设备此时不与任何网络侧的设备连接，所以当网络侧发送下行数据给该设备时，所述下行数据将会丢失。当UE处于可达状态时，即与网络侧设备已建立连接，此时即能收 到网络侧设备发送的下行数据。由于网络侧设备中的MME具备支持在法律许可的范围内进行监听的功能，所以通过MME实时监听所述UE所处的状态。
102、所述MME向服务网关SGW发送请求消息；
当所述MME监听到所述UE从不可达状态变更为可达状态时，即能向所述UE发送下行数据。由于下行数据可以为应用服务器发送的，也可以由其他核心网设备发送的，但是无论下行数据由谁起始发送，必然需要通过SGW进行转发。一般的，若UE一直处于可达状态，即能够直接与SGW建立连接，当下行数据下达至所述SGW时，所述SGW能够直接转发所述下行数据给所述UE。但是，当UE处于不可达状态时，即与所述SGW断开连接，所述SGW将无法发送下行数据给所述UE，即使当UE从不可达状态变更为可达状态时，所述SGW也无法得知所述UE所处的状态，所以需要MME通过从所述SGW获取所述下行数据，才能将所述下行数据发送给所述UE。所述MME获取所述下行数据则需要向所述SGW发送请求消息，以请求所述SGW将所述下行数据发送给所述MME。
103、所述MME接收所述SGW发送的下行数据；
当所述SGW接收到所述MME发送的请求消息后，则将所述下行数据发送给所述MME。需要说明的是，所述下行数据可以由所述SGW所存储的，也可以为所述SGW接收到所述MME发送的请求消息后，向应用服务器发送下发请求信息，请求所述应用服务器发送的下行数据。
104、所述MME将所述下行数据发送给所述UE；
当所述MME接收到所述下行数据之后，则将所述下行数据发送给所述UE，使得所述UE接收所述下行数据，并根据所述下行数据实现相应的功能。
本发明实施例所提供的数据传输的方法包括：移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；所述MME向服务网关SGW发送请求消息；所述MME接收所述SGW发送的下行数据；所述MME将所述下行数据发送给所述UE。这样，当UE变更下行数据可达状态时，MME才向SGW请求发送下行数据，再由MME将下行数据发送给UE，避免了UE处于不可达状态时，下行数据下发至UE而造成的下行数据的丢失，提高了传输的实时准确性。
参照图2所示，本发明实施例中数据传输的方法的另一实施例包括：
201、原移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；
由于用户设备UE可能为移动设备，当UE发送移动时，则有可能需要更换为其服务的MME，以保证所述UE能够正常通信。所以本发明实施例中，所述MME包括原MME与新MME，所述原MME即为所述UE移动之前为所述UE服务的MME，所述新MME即为所述UE移动之后，为所述UE服务的MME。因为在所述UE移动之前，一直由原MME为所述UE服务，所以监听所述UE所处的状态由原MME进行监听。
在另一种实现方式中，也可以由新MME先获取原MME所存储的所述UE的数据信息，由所述新MME监听所述UE所处的状态。
202、所述原MME向服务网关SGW发送请求消息；
一种可选的实现方式中，当原MME确定所述UE从不可达状态变更为可达状态时，由原MME先去获取发往所述UE的下行数据，所以由所述原MME向SGW发送请求消息。
在另一种可选实现方式中，当为所述UE服务的原MME更换为新MME时，所述新MME直接与所述SGW建立连接，所以也可以由所述新MME向SGW发送请求消息，所述新MME接收到所述下行数据之后，则可以直接将所述下行数据发送给所述UE。
203、所述原MME接收所述SGW发送的下行数据；
详细内容参照S103所述。
204、所述原MME将所述下行数据发送给所述新MME；
由于为所述UE服务的原MME已经更换为新MME，所以所述原MME已经无法再发送数据信息给所述UE，所以所述原MME接收到所述SGW发送的下行数据之后，则需要将所述下行数据发送给所述新MME，由所述新MME将所述下行数据发送给所述UE。
205、所述新MME将所述下行数据发送给所述UE；
详细内容参照S104所述。
本发明实施例中，当UE在不可达状态下产生移动时，且导致为所述UE 服务的原MME变更为新MME时，由原MME确定UE从不可达状态变更为可达状态，再通过所述原MME从SGW获取下行数据，所述原MME将所述下行数据发送给所述新MME，最后由所述新MME将所述下行数据发送给所述UE；或者，新MME直接与所述SGW建立连接，由所述新MME确定UE从不可达状态变更为可达状态，所述新MME从所述SGW获取所述下行数据，然后将所述下行数据发送给所述UE。无论上述哪种实现方式，都实现了当为UE服务的MME发生变化时，都能够将下行数据及时发送给UE，提高了数据传输的稳定性。
参照图3所示，本发明实施例中数据传输的方法的另一实施例包括：
301、MME确定所述UE处于不可达状态，所述MME向所述SGW发送响应消息，所述响应消息用于指示所述SGW对所述下行数据进行缓存；所述响应消息还包括缓存过期时间，所述缓存过期时间用于指示所述SGW缓存所述下行数据的过期时间；
由于SGW无法监听UE所处的状态，所以当所述SGW接收到应用服务器发送的下行数据时，所述SGW无法将所述下行数据发送给处于不可达状态的UE，所以所述SGW将发送下行数据通知消息给所述MME，指示有下行数据下达，需要发送给所述UE。MME确定所述UE处于不可达状态，为了防止所述下行数据丢失，所述MME向所述SGW发送响应消息，指示所述SGW先对所述下行数据进行缓存。为了避免所述UE处于不可达的状态过长，而可能导致所述下行数据失准，以及所述SGW的缓存空间有限，若UE一直处于不可达状态，而网络侧发送较多的下行数据给所述SGW时，所述SGW将无法缓存，所以所述响应消息还包括了该下行数据的缓存过期时间，当所述下行数据的缓存时间超出了，仍然没有发送至所述UE时，所述SGW可以将所述下行数据丢弃，或者等待再接收到新的下行数据时，替代原来的下行数据。
302、所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；
上述实施例描述了所述MME监听所述UE从不可达状态变更为可达状态时，所述MME主动获取所述下行数据，并将所述下行数据发送给所述UE。在本发明实施例中，当所述UE从不可达状态变更为可达状态时，所述UE也 可以先发送非接入层NAS消息给所述MME，比如跟踪区更新(英文全称：Tracking Area Update，英文缩写：TAU)消息，以指示所述UE处于可达状态。
可选的，当所述MME确定所述UE变更为可达状态时，也可以由所述MME寻呼所述UE；所述UE接收到所述MME发送的寻呼后，则会向所述MME发送业务请求消息，以更新业务数据，所以所述MME则会接收所述UE发送的业务请求消息；
303、所述MME确定所述下行数据未过期，所述MME向所述SGW发送请求消息；
所述MME接收到所述UE发送的业务请求消息后，因为所述下行数据依然被缓存在所述SGW内，所以所述MME需要先发送请求消息给所述SGW，以请求所述SGW将所述下行数据发送给所述MME，为了确保所述SGW依然缓存有所述下行数据，或者确认所述习性数据依然有效，所述MME在发送所述请求消息之前，所述MME需要先确定所述下行数据未过期。
304、所述MME接收所述SGW发送的下行数据；
详细内容参照S103所述。
305、所述MME将所述下行数据发送给所述UE；
详细内容参照S104所述。
本发明实施例中，当下行数据下发至SGW时，MME确定UE处于不可达状态，则所述MME发送响应消息给所述SGW，指示所述SGW对所述下行数据进行缓存，并设置缓存过期时间，这样，避免了下行数据的丢失，也保证了下行数据的实时准确性。当UE从不可达状态变更为可达状态时，所述UE发送NAS消息给MME，使得所述MME确定所述UE处于可达状态，则所述MME向所述SGW获取下行数据，再将所述下行数据发送给所述UE，这样，使得所述UE及时接收到所述下行数据，提高了数据传输的准确性。
参照图4所示，本发明实施例中数据传输的方法的另一实施例包括：
401、移动性管理实体MME接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
当SGW接收到应用服务器发送的发往UE的下行数据时，发现所述UE无法与所述SGW建立连接，则所述SGW会发送下行数据通知消息给MME， 指示有发往所述UE的下行数据达到，并通过所述下行数据通知消息将所述下行数据发送给所述MME。
402、所述MME确定所述UE处于不可达状态，所述MME缓存所述下行数据；
当所述MME接收到所述下行数据通知消息以及所述下行数据时，所述MME判断所述UE所处的状态，确定所述UE处于不可达状态时，所述MME缓存所述下行数据，以待所述UE变更为可达状态时，所述UE则可以将所述下行数据发送给所述UE。
403、当所述UE变更为可达状态时，所述MME将所述下行数据发送给所述UE。
本发明实施例中，当UE处于不可达状态时，MME接收SGW发送的下行数据，为了避免所述下行数据的丢失，则所述MME对所述下行数据进行缓存，待所述UE变更为可达状态时，所述MME则将所述下行数据发送给所述UE，使得所述UE及时接收到所述下行数据，提高了数据传输的实时性。
参照图5所示，本发明实施例中数据传输的方法的另一实施例包括：
501、移动性管理实体MME接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
详细内容参照S401所述。
502、所述MME确定所述UE处于不可达状态，所述MME缓存所述下行数据；
详细内容参照S402所述。
503、所述MME设置所述下行数据的缓存过期时间；
图3实施例的S301中描述了SGW对下行数据进行缓存，并设置下行数据的缓存过期时间，同理，在本发明实施例中，所述MME也可以对所述下行数据进行缓存，并设置所述下行数据的缓存过期时间。
504、所述MME向所述SGW发送指示消息，指示所述下行数据已缓存；所述指示消息还包括所述下行数据的缓存过期时间；
在S501中描述了当SGW接收到下行数据时，所述SGW若无法将所述下行数据发送给所述UE，则会发送下行数据通知消息给所述UE，当所述MME 已经缓存有下行数据时，则将所述下行数据的缓存过期时间通过指示消息发送给所述SGW，那么在所述下行数据的缓存过期时间内，所述SGW再有接收到应用服务器发送的下行数据时，所述SGW则无需再发送下行数据通知消息给所述MME，因为所述MME依然缓存有下行数据，所以所述MME确定所述UE变更为可达状态时，则会及时与所述UE建立连接。
需要说明的是，当所述SGW在所述下行数据缓存过期时间内再次接收到应用服务器发送的下行数据时，所述SGW可以直接将所述下行数据发送给所述MME，使得所述MME进行缓存，也可以由所述SGW缓存新接收到的下行数据。
505、所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；
详细内容参照S302所述。
506、所述MME确定所述下行数据未过期，所述MME将所述下行数据发送给所述UE；
需要说明的是，当所述UE处于不可达状态时发送了移动，可能导致为所述UE服务的MME发生变化，所以在本发明实施例中，所述MME可以包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述MME将所述下行数据发送给所述UE包括：所述原MME将所述下行数据发送给所述新MME；所述新MME将所述下行数据发送给所述UE。
本发明实施例中，当SGW接收到发往UE的下行数据后，无法将所述下行数据直接发送给所述UE，则所述SGW将所述下行数据发送给MME，所述MME确定所述UE处于不可达状态时，则缓存所述下行数据，并设置所述下行数据的缓存过期时间，这样，提高了下行数据的实效性。当所述UE变更为可达状态时，所述UE向所述MME发送业务请求消息，则所述MME判断所述下行数据是否过期，若否，则将所述下行数据发送给所述UE，提高了数据传输的实时性。
参照图6所示，本发明实施例中数据传输的方法的另一实施例包括：
601、服务网关SGW接收发往用户设备UE的下行数据；
应用服务器发往UE的所有下行数据，都需经过SGW进行转发，所以在 所述下行数据发送至所述UE之前，所述SGW先接收到所述下行数据。
602、所述SGW向移动性管理实体MME发送下行数据通知消息；
当SGW接收到应用服务器发送的发往UE的下行数据时，发现所述UE无法与所述SGW建立连接，则所述SGW会发送下行数据通知消息给MME，指示有发往所述UE的下行数据达到。
603、所述SGW接收所述MME发送的缓存指示；
604、所述SGW根据所述缓存指示，缓存所述下行数据；
可选的，所述缓存指示还包括缓存过期时间；
所述SGW根据所述缓存指示，缓存所述下行数据之后，所述方法还包括：
所述SGW根据所述缓存指示设置所述下行数据的缓存过期时间。
详细内容参照S301所述。
605、所述SGW接收所述MME发送的请求消息；
606、所述SGW根据所述请求消息将所述下行数据发送给所述MME，以使得所述MME将所述下行数据发送给所述UE；
详细内容参照S303所述。
参照图7所示，本发明实施例中数据传输的方法的另一实施例包括：
701、移动性管理实体MME接收应用服务器配置的可达性事件，所述可达性事件用于所述MME向所述应用服务器指示用户设备UE为可达状态；
事件作为计算机术语的含义为：事件是可以被控件识别的操作，如按下确定按钮，选择某个单选按钮或者复选框。每一种控件有自己可以识别的事件，如窗体的加载、单击、双击等事件，编辑框(文本框)的文本改变事件。
上述实施例均描述了无论UE处于可达状态或不可达状态时，应用服务器先发送下行数据给SGW，若所述UE处于不可达状态时，先有SGW缓存所述下行数据，或者由MME缓存所述下行数据，当所述UE变更为可达状态时，再由所述MME将所述下行数据发送给所述UE。然而在本发明实施例中，应用服务器在发送下行数据之前，可以先确定所述UE是否为可达状态，当所述UE为可达状态时，再对所述UE发送下行数据，由于MME具备监听UE的功能，所以所述应用服务器可以先对所述MME设置可达性事件，用于当所述MME确定所述UE为可达状态时，触发所述可达性事件，并向所述应用服务 器指示用户设备UE为可达状态。
702、所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；或者，当所述MME确定所述UE变更为可达状态时，所述MME寻呼所述UE并接收所述UE发起业务请求消息；
详细内容参照S302所述。
703、所述MME向所述应用服务器发送所述UE的可达性事件报告；
当所述MME确定所述UE变更为可达状态时，所述MME则向所述应用服务器发送所述UE的可达性事件报告，以指示所述应用服务器能够将下行数据发往所述UE。
704、所述MME接收来自所述应用服务器发送的下行数据；
可选的，所述MME通过服务网关SGW接收所述应用服务器发送的下行数据；当所述应用服务器接收到所述MME发送的可达性事件报告时，所述应用服务器则能够发送下行数据给所述SGW，所述SGW接收到所述下行数据时，则会将所述下行数据发送给所述MME，以通过所述MME将所述下行数据转发给所述UE。
705、所述MME将所述下行数据发送给所述UE。
本发明实施例中，应用服务器为MME设置有可达性事件，只有当所述MME确定UE处于可达状态时，所述MME才会发送可达性事件报告给所述应用服务器，使得所述应用服务器将下行数据发往所述UE，这样，则保证了所述下行数据为最实时性的数据，提高了数据传输的实时性。
参照图8所示，本发明实施例中移动性管理实体MME的一个实施例包括：
处理模块801，用于确定用户设备UE从不可达状态变更为可达状态；
详细内容参照S101所述。
发送模块802，用于向服务网关SGW发送请求消息；
详细内容参照S102所述。
接收模块803，用于接收所述SGW发送的下行数据；
详细内容参照S103所述。
所述发送模块802还用于，将所述下行数据发送给所述UE；
详细内容参照S104所述。
可选的，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块802具体用于：所述原MME向所述SGW发送请求消息；
详细内容参照S202所述。
所述接收模块803具体用于：所述原MME接收所述SGW发送的下行数据；
详细内容参照S203所述。
所述发送模块802还用于：所述原MME将所述下行数据发送给所述新MME；
详细内容参照S204所述。
所述发送模块802还用于：所述新MME将所述下行数据发送给所述UE；
详细内容参照S205所述。
可选的，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块802具体用于：所述新MME向所述SGW发送请求消息；
详细内容参照S202所述。
所述接收模块803具体用于：所述新MME接收所述SGW发送的下行数据；
所述发送模块802还用于：所述新MME将所述下行数据发送给所述UE。
可选的，所述处理模块801具体用于：当接收所述UE发送的非接入层NAS消息时，确定所述UE处于可达状态。
可选的，所述发送模块802还用于：向所述SGW发送请求消息之前，当确定所述UE从不可达状态变更为可达状态时，寻呼所述UE；
所述接收模块803还用于：接收所述UE发送的业务请求消息；
详细内容参照S302所述。
可选的，所述发送模块802还用于：在确定UE从不可达状态变更为可达状态之前，当确定所述UE处于不可达状态时，向所述SGW发送响应消息，所述响应消息用于指示所述SGW对所述下行数据进行缓存；
可选的，所述响应消息还包括缓存过期时间，所述缓存过期时间用于指示 所述SGW缓存所述下行数据的过期时间；
详细内容参照S301所述。
可选的，所述发送模块802具体还用于：当确定所述下行数据未过期时，向所述SGW发送请求消息；
详细内容参照S303所述。
参照图9所示，本发明实施例中移动性管理实体MME的另一实施例包括：
接收模块901，用于接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
详细内容参照S401所述。
处理模块902，用于确定所述UE处于不可达状态；
存储模块903，用于当确定所述UE处于不可达状态时，缓存所述下行数据；
详细内容参照S402所述。
发送模块904，用于当所述UE变更为可达状态时，将所述下行数据发送给所述UE；
详细内容参照S403所述。
可选的，所述处理模块902还用于：在缓存所述下行数据之后，设置所述下行数据的缓存过期时间。
可选的，所述发送模块904具体用于：当确定所述下行数据未过期时，将所述下行数据发送给所述UE。
可选的，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块904具体用于：
所述原MME将所述下行数据发送给所述新MME；
所述新MME将所述下行数据发送给所述UE；
详细内容参照S506所述。
可选的，所述处理模块902具体用于：
当接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；
详细内容参照S505所述。
可选的，所述发送模块904还用于：将所述下行数据发送给所述UE之前， 当确定所述UE变更为可达状态时，所述MME寻呼所述UE；
所述接收模块901还用于接收所述UE发送的业务请求消息。
可选的，所述发送模块904还用于：缓存所述下行数据之后，向所述SGW发送指示消息，指示所述下行数据已缓存。
可选的，所述指示消息还包括所述下行数据的缓存过期时间。
详细内容参照S504所述。
参照图10所示，本发明实施例中服务网关SGW的一个实施例包括：
接收模块1001，用于接收发往用户设备UE的下行数据；
详细内容参照S601所述。
发送模块1002，用于向移动性管理实体MME发送下行数据通知消息；
详细内容参照S602所述。
所述接收模块1001还用于，接收所述MME发送的缓存指示；
存储模块1003，用于根据所述缓存指示缓存所述下行数据；
详细内容参照S604所述。
所述接收模块1001还用于，接收所述MME发送的请求消息；
所述发送模块1002还用于，根据所述请求消息将所述下行数据发送给所述MME，以使得所述MME将所述下行数据发送给所述UE；
详细内容参照S606所述。
处理模块1004，用于指示所述存储模块1003缓存所述下行数据。
可选的，所述缓存指示还包括缓存过期时间；
所述处理模块1004还用于：在根据所述缓存指示缓存所述下行数据之后，根据所述缓存指示设置所述下行数据的缓存过期时间。
详细内容参照S604所述。
参照图11所示，本发明实施例中移动性管理实体MME的另一实施例包括：
接收模块1101，用于接收应用服务器配置的可达性事件，所述可达性事件用于所述MME向所述应用服务器指示用户设备UE为可达状态；
详细内容参照S701所述。
所述接收模块1101还用于，接收所述UE发送的非接入层NAS消息，确 定所述UE处于可达状态；或者，
当确定所述UE变更为可达状态时，寻呼所述UE并接收所述UE发起业务请求消息；
详细内容参照S702所述。
发送模块1102，用于向所述应用服务器发送所述UE的可达性事件报告；
详细内容参照S703所述。
所述接收模块1101还用于，接收来自所述应用服务器发送的下行数据；
详细内容参照S704所述。
所述发送模块1102还用于，将所述下行数据发送给所述UE；
详细内容参照S705所述。
处理模块1103，用于确定所述UE所处的状态。
可选的，所述接收模块1101具体用于：通过服务网关SGW接收所述应用服务器发送的下行数据；
详细内容参照S704所述。
图12是本发明实施例中移动性管理实体MME的另一结构示意图。该MME可包括至少一个接收器1201、至少一个发射器1202、至少一个处理器1203和存储器1204。
本发明实施例涉及的MME可以具有比图12所示出的更多或更少的部件，可以组合两个或更多个部件，或者可以具有不同的部件配置或设置，各个部件可以在包括一个或多个信号处理和/或专用集成电路在内的硬件、软件或硬件和软件的组合实现。
具体的，所述发射器1202可实现图8实施例中所述的发送模块802、图9实施例中所述的发送模块904、以及图11实施例中所述的发送模块1102的功能；
所述接收器1201可实现图8实施例中所述的接收模块803、图9实施例中所述的接收模块901以及图11实施例中所述的接收模块1101的功能；
所述处理器1203可实现图8实施例中所述的处理模块801、图9实施例中处理模块902以及图11实施例中所述的处理模块1103的功能。
所述存储器1204可实现图9实施例中所述存储模块903的功能。
图13是本发明实施例中服务网关SGW的另一结构示意图。该SGW可包括至少一个接收器1301、至少一个发射器1302、至少一个处理器1303和存储器1304。
本发明实施例涉及的SGW可以具有比图13所示出的更多或更少的部件，可以组合两个或更多个部件，或者可以具有不同的部件配置或设置，各个部件可以在包括一个或多个信号处理和/或专用集成电路在内的硬件、软件或硬件和软件的组合实现。
具体的，所述发射器1302可实现图10实施例中所述的发送模块1002的功能；
所述接收器1301可实现图10实施例中所述的接收模块1001的功能；
所述处理器1303可实现图10实施例中所述的处理模块1004的功能。
所述存储器1304可实现图10实施例中所述存储模块1003的功能。
以上所述，以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (40)

  1. 一种数据传输的方法，其特征在于，所述方法包括：
    移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态；
    所述MME向服务网关SGW发送请求消息；
    所述MME接收所述SGW发送的下行数据；
    所述MME将所述下行数据发送给所述UE。
  2. 根据权利要求1所述的方法，其特征在于，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述MME向服务网关SGW发送请求消息包括：所述原MME向所述SGW发送请求消息；
    所述MME接收所述SGW发送的下行数据包括：所述原MME接收所述SGW发送的下行数据；
    所述方法还包括：所述原MME将所述下行数据发送给所述新MME；
    所述MME将所述下行数据发送给所述UE包括：所述新MME将所述下行数据发送给所述UE。
  3. 根据权利要求1所述的方法，其特征在于，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述MME向服务网关SGW发送请求消息包括：所述新MME向所述SGW发送请求消息；
    所述MME接收所述SGW发送的下行数据包括：所述新MME接收所述SGW发送的下行数据；
    所述MME将所述下行数据发送给所述UE包括：所述新MME将所述下行数据发送给所述UE。
  4. 根据权利要求1至3中任意一项所述的方法，其特征在于，所述移动性管理实体MME确定用户设备UE从不可达状态变更为可达状态包括：
    所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态。
  5. 根据权利要求1至3中任意一项所述的方法，其特征在于，所述MME向所述SGW发送请求消息之前，所述方法还包括：
    当所述MME确定所述UE从不可达状态变更为可达状态时，所述MME寻呼所述UE；
    所述MME接收所述UE发送的业务请求消息。
  6. 根据权利要求1至5中任意一项所述的方法，其特征在于，在所述MME确定UE从不可达状态变更为可达状态之前，所述方法还包括：
    所述MME确定所述UE处于不可达状态，所述MME向所述SGW发送响应消息，所述响应消息用于指示所述SGW对所述下行数据进行缓存。
  7. 根据权利要求6所述的方法，其特征在于，所述响应消息还包括缓存过期时间，所述缓存过期时间用于指示所述SGW缓存所述下行数据的过期时间；
  8. 根据权利要求1至6中任意一项所述的方法，其特征在于，所述MME向所述SGW发送请求消息包括：
    所述MME确定所述下行数据未过期，所述MME向所述SGW发送请求消息。
  9. 一种数据传输的方法，其特征在于，所述方法包括：
    移动性管理实体MME接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
    所述MME确定所述UE处于不可达状态，所述MME缓存所述下行数据；
    当所述UE变更为可达状态时，所述MME将所述下行数据发送给所述UE。
  10. 根据权利要求9所述的方法，其特征在于，所述MME缓存所述下行数据之后，所述方法还包括：
    所述MME设置所述下行数据的缓存过期时间。
  11. 根据权利要求9或10所述的方法，其特征在于，所述MME将所述下行数据发送给所述UE包括：
    所述MME确定所述下行数据未过期，所述MME将所述下行数据发送给所述UE。
  12. 根据权利要求9至11中任意一项所述的方法，其特征在于，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME 时，所述MME将所述下行数据发送给所述UE包括：
    所述原MME将所述下行数据发送给所述新MME；
    所述新MME将所述下行数据发送给所述UE。
  13. 根据权利要求9至12中任意一项所述的方法，其特征在于，所述MME将所述下行数据发送给所述UE之前，所述方法还包括：
    所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态。
  14. 根据权利要求9至12中任意一项所述的方法，其特征在于，所述MME将所述下行数据发送给所述UE之前，所述方法还包括：
    所述MME确定所述UE变更为可达状态，所述MME寻呼所述UE；
    所述MME接收所述UE发送的业务请求消息。
  15. 根据权利要求9至14中任意一项所述的方法，其特征在于，所述MME缓存所述下行数据之后，所述方法还包括：
    所述MME向所述SGW发送指示消息，指示所述下行数据已缓存。
  16. 根据权利要求15所述的方法，其特征在于，所述指示消息还包括所述下行数据的缓存过期时间。
  17. 一种数据传输的方法，其特征在于，所述方法包括：
    服务网关SGW接收发往用户设备UE的下行数据；
    所述SGW向移动性管理实体MME发送下行数据通知消息；
    所述SGW接收所述MME发送的缓存指示；
    所述SGW根据所述缓存指示缓存所述下行数据；
    所述SGW接收所述MME发送的请求消息；
    所述SGW根据所述请求消息将所述下行数据发送给所述MME，以使得所述MME将所述下行数据发送给所述UE。
  18. 根据权利要求17所述的方法，其特征在于，所述缓存指示还包括缓存过期时间；
    所述SGW根据所述缓存指示缓存所述下行数据之后，所述方法还包括：
    所述SGW根据所述缓存指示设置所述下行数据的缓存过期时间。
  19. 一种数据传输的方法，其特征在于，所述方法包括：
    移动性管理实体MME接收应用服务器配置的可达性事件，所述可达性事件用于所述MME向所述应用服务器指示用户设备UE为可达状态；
    所述MME接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；或者，
    当所述MME确定所述UE变更为可达状态时，所述MME寻呼所述UE并接收所述UE发起业务请求消息；
    所述MME向所述应用服务器发送所述UE的可达性事件报告；
    所述MME接收来自所述应用服务器发送的下行数据；
    所述MME将所述下行数据发送给所述UE。
  20. 根据权利要求19所述的方法，其特征在于，所述MME接收所述应用服务器发送的下行数据包括：
    所述MME通过服务网关SGW接收所述应用服务器发送的下行数据。
  21. 一种移动性管理实体MME，其特征在于，所述MME包括：
    处理模块，用于确定用户设备UE从不可达状态变更为可达状态；
    发送模块，用于向服务网关SGW发送请求消息；
    接收模块，用于接收所述SGW发送的下行数据；
    所述发送模块还用于，将所述下行数据发送给所述UE。
  22. 根据权利要求21所述的MME，其特征在于，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块具体用于：所述原MME向所述SGW发送请求消息；
    所述接收模块具体用于：所述原MME接收所述SGW发送的下行数据；
    所述发送模块还用于：所述原MME将所述下行数据发送给所述新MME；
    所述发送模块还用于：所述新MME将所述下行数据发送给所述UE。
  23. 根据权利要求21所述的MME，其特征在于，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块具体用于：所述新MME向所述SGW发送请求消息；
    所述接收模块具体用于：所述新MME接收所述SGW发送的下行数据；
    所述发送模块还用于：所述新MME将所述下行数据发送给所述UE。
  24. 根据权利要求21至23中任意一项所述的MME，其特征在于，所述 处理模块具体用于：
    当接收所述UE发送的非接入层NAS消息时，确定所述UE处于可达状态。
  25. 根据权利要求21至23中任意一项所述的MME，其特征在于，所述发送模块还用于：
    向所述SGW发送请求消息之前，当确定所述UE从不可达状态变更为可达状态时，寻呼所述UE；
    所述接收模块还用于：接收所述UE发送的业务请求消息。
  26. 根据权利要求21至25中任意一项所述的MME，其特征在于，所述发送模块还用于：
    在确定UE从不可达状态变更为可达状态之前，当确定所述UE处于不可达状态时，向所述SGW发送响应消息，所述响应消息用于指示所述SGW对所述下行数据进行缓存。
  27. 根据权利要求26所述的MME，其特征在于，所述响应消息还包括缓存过期时间，所述缓存过期时间用于指示所述SGW缓存所述下行数据的过期时间；
  28. 根据权利要求21至26中任意一项所述的MME，其特征在于，所述发送模块具体还用于：
    当确定所述下行数据未过期时，向所述SGW发送请求消息。
  29. 一种移动性管理实体MME，其特征在于，所述MME包括：
    接收模块，用于接收服务网关SGW发送的下行数据通知消息，所述通知消息包含有发往用户设备UE的下行数据；
    处理模块，用于确定所述UE处于不可达状态；
    存储模块，用于当确定所述UE处于不可达状态时，缓存所述下行数据；
    发送模块，用于当所述UE变更为可达状态时，将所述下行数据发送给所述UE。
  30. 根据权利要求29所述的MME，其特征在于，所述处理模块还用于：
    在缓存所述下行数据之后，设置所述下行数据的缓存过期时间。
  31. 根据权利要求29或30所述的MME，其特征在于，所述发送模块具 体用于：
    当确定所述下行数据未过期时，将所述下行数据发送给所述UE。
  32. 根据权利要求29至31中任意一项所述的MME，其特征在于，所述MME包括原MME与新MME，当为所述UE服务的所述原MME更换为所述新MME时，所述发送模块具体用于：
    所述原MME将所述下行数据发送给所述新MME；
    所述新MME将所述下行数据发送给所述UE。
  33. 根据权利要求29至32中任意一项所述的MME，其特征在于，所述处理模块具体用于：
    当接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态。
  34. 根据权利要求29至32中任意一项所述的MME，其特征在于，所述发送模块还用于：
    将所述下行数据发送给所述UE之前，当确定所述UE变更为可达状态时，所述MME寻呼所述UE；
    所述接收模块还用于接收所述UE发送的业务请求消息。
  35. 根据权利要求29至34中任意一项所述的MME，其特征在于，所述发送模块还用于：
    缓存所述下行数据之后，向所述SGW发送指示消息，指示所述下行数据已缓存。
  36. 根据权利要求35所述的MME，其特征在于，所述指示消息还包括所述下行数据的缓存过期时间。
  37. 一种服务网关SGW，其特征在于，所述SGW包括：
    接收模块，用于接收发往用户设备UE的下行数据；
    发送模块，用于向移动性管理实体MME发送下行数据通知消息；
    所述接收模块还用于，接收所述MME发送的缓存指示；
    存储模块，用于根据所述缓存指示缓存所述下行数据；
    所述接收模块还用于，接收所述MME发送的请求消息；
    所述发送模块还用于，根据所述请求消息将所述下行数据发送给所述MME，以使得所述MME将所述下行数据发送给所述UE；
    处理模块，用于指示所述存储模块缓存所述下行数据。
  38. 根据权利要求37所述的SGW，其特征在于，所述缓存指示还包括缓存过期时间；
    所述处理模块还用于：
    在根据所述缓存指示缓存所述下行数据之后，根据所述缓存指示设置所述下行数据的缓存过期时间。
  39. 一种移动性管理实体MME，其特征在于，所述MME包括：
    接收模块，用于接收应用服务器配置的可达性事件，所述可达性事件用于所述MME向所述应用服务器指示用户设备UE为可达状态；
    所述接收模块还用于，接收所述UE发送的非接入层NAS消息，确定所述UE处于可达状态；或者，
    当确定所述UE变更为可达状态时，寻呼所述UE并接收所述UE发起业务请求消息；
    发送模块，用于向所述应用服务器发送所述UE的可达性事件报告；
    所述接收模块还用于，接收来自所述应用服务器发送的下行数据；
    所述发送模块还用于，将所述下行数据发送给所述UE；
    处理模块，用于确定所述UE所处的状态。
  40. 根据权利要求39所述的MME，其特征在于，所述接收模块具体用于：
    通过服务网关SGW接收所述应用服务器发送的下行数据。
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