CN107005838A

CN107005838A - The method and apparatus of data transfer

Info

Publication number: CN107005838A
Application number: CN201580030158.6A
Authority: CN
Inventors: 黄正磊; 张万强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-07-08
Filing date: 2015-07-08
Publication date: 2017-08-01
Anticipated expiration: 2035-07-08
Also published as: WO2017004805A1; CN107005838B

Abstract

The embodiments of the invention provide a kind of method and apparatus of data transfer, when the downlink data for the user equipment that this method is sent including mobility management entity in data sending terminal is unreachable, first is sent to gateway and indicates message, and downlink data is cached for indicating service gateway；Mobility management entity determines to need to send the second instruction message to data sending terminal；Mobility management entity sends second to data sending terminal and indicates message, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second, data sending terminal of the embodiment of the present invention can flexibly transmit downlink data according to the second instruction message, unnecessary data transfer is avoided, network efficiency is improved.

Description

The method and apparatus of data transfer

Technical field

The present invention relates to the communications field, and more particularly, to the method and apparatus of data transfer.

Background technology

In order to support wireless side (such as LTE) evolution, third generation cooperative programme (The 3rd Generation Partnership Project, referred to as " 3GPP ") begin one's study the System Architecture Evolution (System Architecture Evolution, referred to as " SAE ") of network side in December, 2004.LTE and SAE together constitute evolved packet system (Evolved Packet System, referred to as " EPS ").The EPS network architectures have taken into full account the compatibility with existing 2G/3G networks using end-to-end full Internet protocol (Internet Protocol, referred to as " IP ") networking and flattening network structure.

In the EPS network architectures, main network functional entity has：

1) the Universal Terrestrial wireless access network (Evolved Universal Terrestrial Radio Access Network, referred to as " EUTRAN ") of evolution：The network being made up of multiple eNodeB, for realizing radio physical layer function, scheduling of resource function, radio resource management function, radio access control function and mobile management function to ps domain.Wherein, eNodeB is connected by interface in the user plane S1-U and gateway (Serving Gateway, referred to as " S-GW "), for transmitting user data；ENodeB is connected by chain of command interface S1-MME with MME, using functions such as S1-AP protocol realizations RAB controls.

2) mobility management entity (Mobility Management Entity, referred to as " MME ")：All control plane functions of main responsible user conversation management, including Non-Access Stratum (Non Access Stratum, referred to as " NAS ") signaling and safety, the management of tracking area, PDN Gateway (PDN Gateway, referred to as " P-GW ") and S-GW selection etc..

3)S-GW：Mainly it is responsible for user equipment (User, data transfer, forwarding and route handoff etc. Equipment, referred to as " UE "), and local mobile anchor point when switching as UE between eNodeB, for each UE, only have a S-GW a moment and service for it.

4)P-GW：It is used as packet data network (Packet Data Network, referred to as " the PDN ") anchor point of connection, it is responsible for UE Internet protocol (Internet Protocol, referred to as " IP ") address distribution, UE data message filtering, speed control, generation charge information etc..

In the EPS network architectures, UE EPS Connection Management (EPS Connection Management, Referred to as " ECM ") state includes：ECM-IDLE (i.e. Idle state) and ECM-CONNECTED (i.e. connected state), the ECM reflect UE signaling connection characteristic.

Wherein, NAS signaling is not present under Idle state (ECM-IDLE), between UE and network to connect, for example, does not include wireless heterogeneous networks (Radio Resource Control, referred to as " RRC ") connection and S1-MME connections；At connected state (ECM-CONNECTED), there is NAS signaling connection, including RRC connections and S1-MME connections between UE and network.

If when for a long time without NAS signaling connection is not present between data transfer, i.e. UE and network, UE can enter Idle state.In Idle state, UE is mainly monitored call channel and broadcast channel, if UE wants monitoring users data channel, must be transferred to connected state from idle condition.For example assume that UE is in Idle state, when EPS network sides receive downlink data message or the signaling of the UE, EPS networks can initiate network side triggering service request flow, MME can initiate paging (paging) in the tracing area where current UE in the flow, the UE can be transferred to connected state in response to MME paging, then can be with monitoring users data channel, so as to receive data or signaling.Network side triggering service request flow is as follows：

Step 1：After S-GW receives UE downlink data message, S-GW sends downlink data notification message to MME；

Step 2：After MME receives downlink data notification message, corresponding UE contexts are searched, and return to confirmation message to S-GW；

Step 3：All eNodeBs of the MME into the tracking area where the UE initiate paging, and UE marks (IMSI or P-TMSI etc.), paging priority of the UE etc. are carried in the beep-page message for be sent to eNodeB；

Step 4：ENodeB carries out paging according to the beep-page message received to the UE；

Step 5：The UE responds paging, initiates se ce request procedure, sets up user plane, begins preparing for receiving downlink data.

In order to reduce the electric quantity consumption of user equipment, user equipment can enable power savings pattern (PSM).User equipment can ask an active time (Active Time) to network side, and each user equipment is transferred to after Idle state from connected state, and user equipment can start timer (time value of the timer is active time).After the timer expiry, user equipment can enter from Idle state saves electricity pattern.Under power savings pattern, user equipment no longer monitors the beep-page message of network side, that is, user equipment will not response to network side paging.

Discontinuous reception (Discontinuous Reception, referred to as " DRX ") is a kind of saving UE The mode of operation of power consumption.If UE employs DRX, UE only opens receiver in special time period and enters the activation phase, and to receive downlink data and signaling, and section closing receiver enters rest period at other times, stops receiving downlink data and signaling.

DRX includes two kinds of Idle state DRX (referred to as " I-DRX ") and connected state DRX (referred to as " C-DRX "), wherein, what Idle state DRX referred to as its name suggests is exactly, when the UE noncontinuities being under idle (IDLE) state receive (DRX), connected state DRX is exactly the noncontinuity reception (DRX) that UE is under connected state.

DRX cycle is referred to as DRX cycle, and a DRX cycle is divided into activation phase and rest period.DRX cycle is divided into long period and short cycle again, wherein, macrocyclic rest period is longer, and short-period rest period is shorter, and long period and the duration of short-period activation phase are the same.In addition, long period is short-period integral multiple.

When the user equipment (UE) in Idle state has downlink data arrival, network initiates paging to UE.But the interim interruption of wireless signal or because UE enables the electricity-saving functions such as PSM, macrocyclic DRX, by the paging for causing UE to cannot respond to network.Service application constantly retransmits data, so as to add load and the paging expense of core network element.

To avoid the problem, MME may indicate that the downlink data of S-GW caching delay tolerance services, when UE up to when the data of caching are sent to UE again.MME can provide cache-time T and/or data cached bag number N to S-GW, and wherein cache-time T is relevant with the delay requirement of the UE power-save mechanisms used and application, and N can be determined based on subscription data (owner priority, packet loss etc.) etc..S-GW is determined to the number of data packets M of caching based on the MME N provided and the configuration of itself.S-GW indicates caching UE downlink datas according to MME, when timer T time-out or the number of data packets that receives are more than M, the discardable packets cached of S-GW.

When timer T time-out or the number of data packets received are more than the packet that M, S-GW have cached discarding.Now data sending terminal such as application server (AS) or service capability server (SCS), in this case it is not apparent that whether UE is reachable, continues to retransmit or sends new downlink data packet.Because S-GW does not cache the downlink data packet received, now the downlink data of data sending terminal sends or retransmitted and is not necessarily to, so as to add the load of core net node, and causes the waste of Internet resources.

The content of the invention

The embodiment of the present invention provides a kind of method and apparatus of data transfer, and this method can flexibly transmit downlink data, it is to avoid unnecessary data transfer, improves network efficiency.

First aspect there is provided a kind of method of data transfer, including：When the downlink data for the user equipment that mobility management entity is sent in data sending terminal is unreachable, sends first to gateway and indicate message, the first instruction message is used to indicate the cached in serving gateway downlink data；

The mobility management entity determines to need to send the second instruction message to the data sending terminal；

The mobility management entity sends the second instruction message to the data sending terminal, in order to which the data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference in a first aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information.

With reference to first aspect or the first can with implementation, in second of possible implementation, when the downlink data of the user equipment sent in the mobility management entity in data sending terminal is unreachable, before sending the first instruction message to gateway, this method also includes：

The mobility management entity obtains the first request message of data sending terminal transmission, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, first request message carries the address information of the data sending terminal and the mark of the user equipment

Wherein, the mobility management entity determines to need to send the second instruction message to the data sending terminal, including：

If the mobility management entity determines that the mark of user equipment of the mark of the user equipment with being carried in first request message is identical, the mobility management entity determines to need to send the second instruction message to the data sending terminal.

With reference to first aspect, the first to second can with the possible implementation of any of implementation, in the third possible implementation, before the mobility management entity sends second configured information to the data sending terminal, in addition to：

The mobility management entity generates the second instruction message.

With reference to first aspect, the first to second can with the possible implementation of any of implementation, in the 4th kind of possible implementation, the first instruction message is additionally operable to indicate that the gateway generates this and second indicates message,

Wherein, before the mobility management entity sends second configured information to the data sending terminal, in addition to：

The mobility management entity receives the second instruction message of gateway transmission.

With reference to first aspect or the first can with implementation, in the 5th kind of possible implementation, the mobility management entity determine need to the data sending terminal send second indicate message, including：

If the mobility management entity determines the mark identical mark for having with the user equipment in default feedback indicator list, then the mobility management entity determines to need to send the second instruction message to the data sending terminal, wherein, the default feedback indicator list includes needing to feed back the mark of the user equipment of the second instruction message.

With reference to the 5th kind of possible implementation, in the 6th kind of possible implementation, the first instruction message is additionally operable to indicate the address information that the gateway sends the data sending terminal to the mobility management entity, before the mobility management entity sends second configured information to the data sending terminal, this method also includes：

The mobility management entity receives the address information of the data sending terminal of gateway transmission；

The mobility management entity generates the second instruction message, and the second instruction message carries the address information of the data sending terminal.

With reference to the 5th kind of possible implementation, in the 7th kind of possible implementation, the first instruction message is additionally operable to indicate that the gateway generates the second instruction message,

Before the mobility management entity sends the second instruction message to the data sending terminal, in addition to：

With reference to first aspect, first to the 7th kind can with the possible implementation of any of implementation, in the 8th kind of possible implementation, in addition to：

The mobility management entity receives the confirmation message of data sending terminal transmission, and the confirmation message is used to indicate that the data sending terminal has received the second instruction message.

Second aspect there is provided a kind of method of data transfer, including：Data sending terminal obtains second and indicates message, and the second instruction message is generated after gateway receives the first instruction message, and the first instruction message is used for the downlink data for indicating the inaccessible user equipment of cached in serving gateway downlink data；

The data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference to second aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information,

Wherein,

When the configured information includes the duration, the data sending terminal sends the downlink data of the user equipment according to the second instruction message, including：

The data sending terminal sends the downlink data of the user equipment according to the second instruction message determination within the duration,

When the configured information includes the number of data packets, the data sending terminal sends the downlink data of the user equipment according to the second instruction message, including：

The data sending terminal sends the downlink data of the user equipment according to the second instruction message, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to the number of data packets,

When the configured information includes the duration and the number of data packets, the data sending terminal sends the downlink data of the user equipment according to the second instruction message, including：

The data sending terminal determines to send the downlink data of the user equipment within the duration according to the second instruction message, and the quantity of the packet of the downlink data for the user equipment that the data sending terminal is sent is less than or equal to the number of data packets within the duration.

With reference to the first possible implementation of second aspect, in second of possible implementation, include the duration in the configured information, or the configured information includes the duration and during the number of data packets, this method also includes：

The data sending terminal determines not sending the downlink data of the user equipment in the time in addition to the duration according to the second instruction message.

With reference to second aspect, second aspect the first to any of second possible implementation possible implementation, in the third possible implementation, the data sending terminal obtain second indicate message before, in addition to：

The data sending terminal sends the first request message, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, and first request message carries the address information of the data sending terminal and the mark of the user equipment.

With reference to second aspect, second aspect the first to the possible implementation of any of the third possible implementation, in the 4th kind of possible implementation, in addition to：

The data sending terminal sends confirmation message to the mobility management entity, and the confirmation message is used to indicate that the data sending terminal has received the second instruction message.

The third aspect there is provided a kind of method of data transfer, including：Gateway receives mobility pipe The first instruction message that entity is sent is managed, the first instruction message is used for the downlink data for indicating the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and generates the second instruction message；

The gateway obtains the address information of the data sending terminal；

The gateway generates and sends the second instruction message according to the instruction of the first instruction message and the address information of the data sending terminal, in order to which the data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference to the third aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information.

With reference to the first possible implementation of the third aspect or the third aspect, in second of possible implementation, the first instruction message carries the address information of the data sending terminal,

Wherein, the gateway obtains the address information of the data sending terminal, including：

The gateway obtains the address information of the data sending terminal according to the first instruction message.

With reference to the first possible implementation of the third aspect or the third aspect, in the third possible implementation, the first instruction message is additionally operable to indicate the address information that the gateway obtains the data sending terminal,

The gateway carries out the detection of the downlink data according to the instruction of the first instruction message, obtains the address information of the data sending terminal.

Fourth aspect there is provided a kind of method of data transfer, including：Gateway receives the first instruction message that mobility management entity is sent, the first instruction message is used for the downlink data for indicating the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and obtains the address information of the data sending terminal；

The gateway carries out the detection of the downlink data according to the instruction of the first instruction message, obtains the address information of the data sending terminal；

The gateway sends the address information of the data sending terminal to the mobility management entity, message is indicated in order to which the mobility management entity generates according to the address information of the data sending terminal and sends second to the data sending terminal, so that the data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference to fourth aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information.

There is provided a kind of mobility management entity in terms of 5th, including：

First determining unit, when the downlink data of the user equipment for being sent in data sending terminal is unreachable, sends first to gateway and indicates message, and the first instruction message is used to indicate the cached in serving gateway downlink data；

Second determining unit, the second instruction message is sent for determining to need to the data sending terminal；

Transmitting element, for sending the second instruction message to the data sending terminal, in order to which the data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference to the 5th aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information.

With reference to the 5th aspect or the 5th aspect the first can with implementation, in second of possible implementation, in addition to：

Acquiring unit, when the downlink data of user equipment for being sent in the first determining unit in data sending terminal is unreachable, before the first instruction message being sent to gateway, obtain the first request message of data sending terminal transmission, first request message is used to ask network to feed back the second instruction message when the user equipment is unreachable, first request message carries the address information of the data sending terminal and the mark of the user equipment

Wherein, second determining unit is if it is determined that the mark for identifying the user equipment with being carried in first request message of the user equipment is identical, it is determined that need to send the second instruction message to the data sending terminal.

With reference to the 5th aspect, the 5th aspect the first to second can with the possible implementation of any of implementation, in the third possible implementation, in addition to：

First generation unit, for before the transmitting element sends the second instruction message to the data sending terminal, generating the second instruction message.

With reference to the 5th aspect, the 5th aspect the first to second can with the possible implementation of any of implementation, in the 4th kind of possible implementation, the first instruction message is additionally operable to indicate should Gateway generates the second instruction message, and the mobility management entity also includes：

Receiving unit, the second instruction message for before the transmitting element sends downlink data transmission the second instruction message to the data sending terminal, receiving gateway transmission.

With reference to the 5th aspect or the 5th aspect the first can with implementation, in the 5th kind of possible implementation, if it is determined that there is the mark identical mark with the user equipment in default feedback indicator list in first determining unit, then determine to need to send the second instruction message to the data sending terminal, wherein, the default feedback indicator list includes needing to feed back the mark of the user equipment of the second instruction message.

With reference to the 5th kind of possible implementation of the 5th aspect, in the 6th kind of possible implementation, the first instruction message is additionally operable to indicate the address information that the gateway sends the data sending terminal to the mobility management entity, and the mobility management entity also includes：

First receiving unit, for before the transmitting element sends downlink data transmission configured information to the data sending terminal, receiving the address information of the data sending terminal of gateway transmission；

Second generation unit, for before the transmitting element sends downlink data transmission configured information to the data sending terminal, generating the second instruction message, the second instruction message carries the address information of the data sending terminal.

With reference to the 5th kind of possible implementation of the 5th aspect, in the 7th kind of possible implementation, the first instruction message is additionally operable to indicate that the gateway generates the second instruction message, and the mobility management entity also includes：

Second receiving unit, the second instruction message for before the transmitting element sends the second instruction message to the data sending terminal, receiving gateway transmission.

With reference to the 5th aspect, first to the 7th kind of the 5th aspect can with the possible implementation of any of implementation, in the 8th kind of possible implementation, in addition to：

3rd receiving unit, the confirmation message for receiving data sending terminal transmission, confirmation message is used to indicate that the data sending terminal has received the second instruction message.

There is provided a kind of data sending terminal in terms of 6th, including：

Acquiring unit, message is indicated for obtaining second, and the second instruction message is generated after gateway receives the first instruction message, and the first instruction message is used for the downlink data for indicating the inaccessible user equipment of cached in serving gateway downlink data；

First transmitting element, the downlink data for sending the user equipment according to the second instruction message.

With reference to the 6th aspect, in the first possible implementation, the second instruction message carries the configured information of the cached in serving gateway downlink data, and the configured information includes duration and/or number-of-packet Mesh,

Wherein,

When the configured information includes the duration, first transmitting element determines to send the downlink data of the user equipment within the duration according to the second instruction message,

When the configured information includes the number of data packets, first transmitting element sends the downlink data of the user equipment according to the second instruction message, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to the number of data packets

When the configured information includes the duration and the number of data packets, first transmitting element determines to send the downlink data of the user equipment within the duration according to the second instruction message, and the quantity of the packet of the downlink data for the user equipment that the data sending terminal is sent is less than or equal to the number of data packets within the duration.

With reference to the first possible implementation of the 6th aspect, in second of possible implementation, include the duration in the configured information, or the configured information includes the duration and during the number of data packets, the data sending terminal also includes：

Determining unit, for determining not sending the downlink data of the user equipment in the time in addition to the duration according to the second instruction message.

With reference to the 6th aspect, the 6th aspect the first to any of second possible implementation possible implementation, in the third possible implementation, in addition to：

Second transmitting element, for before the acquiring unit obtains the second instruction message, send the first request message, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, and first request message carries the address information of the data sending terminal and the mark of the user equipment.

With reference to the 6th aspect, the 6th aspect the first to the possible implementation of any of the third possible implementation, in the 4th kind of possible implementation, in addition to：

3rd transmitting element, sends confirmation message, the confirmation message is used to indicate that the data sending terminal has received the second instruction message for sending downlink data to the mobility management entity.

There is provided a kind of gateway in terms of 7th, including：

Receiving unit, first for receiving mobility management entity transmission indicates message, and the first instruction message indicates message for indicating the downlink data for the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and generating second；

Acquiring unit, the address information for obtaining the data sending terminal；

Transmitting element, the second instruction message is generated and sent for the instruction according to the first instruction message and the address information of the data sending terminal, in order to which the data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference to the 7th aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information.

With reference to the 7th aspect or the first possible implementation of the 7th aspect, in second of possible implementation, the first instruction message carries the address information of the data sending terminal,

Wherein, the acquiring unit obtains the address information of the data sending terminal according to the first instruction message.

With reference to the 7th aspect or the first possible implementation of the 7th aspect, in the third possible implementation, the first instruction message is additionally operable to indicate the address information that the gateway obtains the data sending terminal,

Wherein, the acquiring unit carries out the detection of the downlink data according to the instruction of the first instruction message, obtains the address information of the data sending terminal.

There is provided a kind of gateway for eighth aspect, it is characterised in that including：

Receiving unit, first for receiving mobility management entity transmission indicates message, the first instruction message is used for the downlink data for indicating the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and obtains the address information of the data sending terminal；

Acquiring unit, the detection for carrying out the downlink data according to the instruction of the first instruction message, obtains the address information of the data sending terminal；

Transmitting element, address information for sending from the data sending terminal to the mobility management entity, generated in order to the mobility management entity according to the address information of the data sending terminal and send the second instruction message to the data sending terminal, so that the data sending terminal sends the downlink data of the user equipment according to the second instruction message.

With reference to eighth aspect, in the first possible implementation, this first indicates that message carries the configured information for indicating the cached in serving gateway downlink data, and the configured information includes duration and/or number of data packets,

The second instruction message carries the configured information.

Based on above-mentioned technical proposal, when the downlink data for the user equipment that the embodiment of the present invention can be sent in data sending terminal is unreachable, mobility management entity sends first to gateway and indicates message, indicates clothes Business gateway caches downlink data；And mobility management entity sends second to data sending terminal and indicates message, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within a certain duration, the downlink data of the user equipment is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.

Brief description of the drawings

Technical scheme in order to illustrate the embodiments of the present invention more clearly, the required accompanying drawing used in the embodiment of the present invention will be briefly described below, apparently, drawings described below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the schematic diagram for the communication network scene that can be applied to the embodiment of the present invention.

Fig. 2 is the indicative flowchart of communication means according to an embodiment of the invention.

Fig. 3 is the indicative flowchart of the method for data transfer according to an embodiment of the invention.

Fig. 4 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Fig. 5 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Fig. 6 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Fig. 7 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Fig. 8 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Fig. 9 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Figure 10 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.

Figure 11 is the schematic block diagram of mobility management entity according to an embodiment of the invention.

Figure 12 is the schematic block diagram of data sending terminal according to an embodiment of the invention.

Figure 13 is the schematic block diagram of gateway according to an embodiment of the invention.

Figure 14 is the schematic block diagram of gateway according to another embodiment of the present invention.

Figure 15 is the schematic block diagram of mobility management entity according to another embodiment of the present invention.

Figure 16 is the schematic block diagram of data sending terminal according to another embodiment of the present invention.

Figure 17 is the schematic block diagram of gateway according to another embodiment of the present invention.

Figure 18 is the schematic block diagram of gateway according to another embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made should all belong to the scope of protection of the invention.

It should be understood that technical scheme can apply to evolved packet system (Evolved Packet System, referred to as " EPS "), other various communication systems can also be applied to, for example：Global system for mobile telecommunications (Global System of Mobile communication, referred to as " GSM ") system, CDMA (Code Division Multiple Access, referred to as " CDMA ") system, WCDMA (Wideband Code Division Multiple Access, referred to as " WCDMA ") system, GPRS (General Packet Radio Service, referred to as " GPRS "), Long Term Evolution (Long Term Evolution, referred to as " LTE ") system, LTE FDDs (Frequency Division Duplex, referred to as " FDD ") system, LTE time division duplexs (Time Division Duplex, referred to as " TDD "), UMTS (Universal Mobile Telecommunication System, referred to as " UMTS ") etc..

It will also be understood that, in embodiments of the present invention, user equipment (User Equipment, referred to as " UE ") is also referred to as terminal, mobile terminal (Mobile Terminal), mobile station (Mobile Station, referred to as " MS ") etc..The user equipment (UE) can be communicated through wireless access network (Radio Access Network, referred to as " RAN ") with one or more core nets.Specifically, for example, user equipment (UE) can be mobile phone (or being " honeycomb " phone), the computer with mobile terminal, can also be portable, pocket, hand-held, built-in computer or vehicle-mounted mobile device, they exchange language and/or data with wireless access network RAN.In addition, the user equipment (UE) can also be such as sensor MTC device.Or, in embodiments of the present invention, mobile device UE can also be mobile relay equipment, for example mobile access point (Access Point, referred to as " AP "), and the embodiment of the present invention is not construed as limiting to this.

It will also be understood that, in embodiments of the present invention, Radio Access Network RAN node can be specifically base station, the base station can be evolved base station (the Evolutional Node B in LTE, referred to as " eNB or e-NodeB "), can also be base station (the Base Transceiver Station in GSM, referred to as " BTS "), it can also be the base station (NodeB in WCDMA, referred to as " NB "), the embodiment of the present invention is not limited, but for convenience of description, following embodiments will be illustrated by taking eNB as an example.

Fig. 1 is the schematic diagram for the communication network scene that can be applied to the embodiment of the present invention.The logical architecture of mobile communications network as shown in Figure 1 includes：User equipment 110, access network 120, mobile management net element 130th, gateway 140, data gateway 150 and message data network 160.User equipment 110 connects access network 120 by local wireless network or finite element network, mobile management net element 130 is responsible for the functions such as location management, connection management, safety certification, the gateway selection of user equipment 110, gateway 140 is that the local access network of user equipment 110 is closed, it is responsible for the related connection management of access technology and data forwarding, data gateway 150 is the gateway of message data network 160 outside user equipment access.

Above-mentioned logical architecture figure correspondence real network, can be grouping system (the Evolved Packet System of evolution, EPS) network, access network can be UTRAN (Universal Terrestrial Radio Access Network, universal terrestrial access network), GERAN (GSM EDGE Radio Access Network, GSM EDGE Radio Access Network network) or E-UTRAN (Evolved Universal Terrestrial Radio Access Network, evolved universal terrestrial radio access network), mobile management net element can be mobility management entity (Mobility Management Entity, ) or GPRS Service support nodes (Serving GPRS Support Node MME, SGSN), gateway can be gateway (Serving Gateway, S-GW), data gateway can be message data network gateway (Packet Data Network Gateway, PDN-GW).

Illustrate the network element device that the embodiment of the present invention is related generally to by way of example below：

Mobile management entity MME：The function related with " downlink data send indicate " processing is supported, include the request of " downlink data, which is sent, to be indicated " message, generate and feedback, and strategy is locally configured in correlation.

Gateway S-GW：The function related to " downlink data, which is sent, to be indicated " processing can be supported, generation and feedback including " downlink data, which is sent, to be indicated " message, the relevant information (such as source/destination IP address) of downlink data packet is provided to MME, and related strategy is locally configured.

It should be noted that, in order to strengthen network to Machine To Machine (Machine-To-Machine, the enabling capabilities of new business such as M2M), 3GPP commencing business open architecture enhancing (Architecture Enhancements for Service Exposure, AESE) research project.New network entity defined in AESE：Opening service capability function (Service Capability Exposure Function, SCEF), multiple business ability can be provided by the application programming interface (Application Programming Interface, API) of one or more standards.Network can interact the information such as the communication pattern to obtain user equipment (UE), such as data volume size, position and movement sexual norm with external business application.External business application also can be by API from information such as Network Capture UE connection attribute, accessibility and network states.

Accused with reference to Fig. 2 with network to third-party application server (Application Server, AS) Know the flow of UE connection attributes, illustrate how AESE provides multiple business ability by SCEF.Specifically, flow as shown in Figure 2 includes：

201, P-GW discovery UE establish a new PDN connection；

202, P-GW report that PDN connections are set up in message, message to SCEF includes UE marks, APN and UE IP address；

203, SCEF preserve the information received, and return to confirmation message to P-GW；

204, AS send message request to SCEF informs that including UE in UE connection attributes, message identifies the IP packet filter information related to specific transactions；

205, SCEF authorize to AS UE connection attribute request messages；

206, SCEF check whether from the P-GW PDN connections for receiving the UE and set up configured information, and the IP address of the UE and the IP filter information match that is received from AS.If having been received by instruction, proceed follow-up information flow；

207, SCEF send UE connection attribute request messages to P-GW, and UE marks and UE IP address information are included in message；

208, P-GW return to the PDN link information related to the UE IP address, such as IP-CAN types, RAT types, APN-AMBR parameters to SCEF.SCEF generates corresponding UE connection attributes according to the PDN link informations received；

UE connection attribute information is informed third party AS by 209, SCEF.

It should be understood that the mobility management entity in the embodiment of the present invention can be MME or can also be SGSN；Gateway can be S-GW or SGSN；User equipment can be MS, or UE；Data sending terminal can be that third-party AS or service capability server (Service Capability Server, SCS) embodiment of the present invention are limited not to this.

It will also be understood that, the first instruction message in the embodiment of the present invention is referred to as downlink data notification and confirms DDNA message, second instruction message is referred to as downlink data and sends instruction message, first request message can be sent for downlink data and indicate request message, and the embodiment of the present invention is limited not to this.

Below by MME of mobility management entity, gateway be S-GW, user equipment be UE first indicate message be downlink data notification confirm DDNA message, second indicates that message is that downlink data sends instruction message, first request message is that downlink data sends instruction request message, citing is illustrated, but the embodiment of the present invention is not limited to this.

It should be noted that first in the embodiment of the present invention indicates that message, second indicate that message, the title of the first request message can be the message of other titles, as long as the corresponding function of these message can be realized , the embodiment of the present invention is not limited to this.

Fig. 3 is the indicative flowchart of the method for data transfer according to an embodiment of the invention.Method shown in Fig. 3 can be performed by mobility management entity, specifically, and method as shown in Figure 3 includes：

310, when the downlink data for the user equipment that mobility management entity is sent in data sending terminal is unreachable, sends first to gateway and indicate message, first indicates that message is used for indicating service gateway and caches downlink data；

Determine that UE enables the electricity-saving function such as PSM or long period DRX for example, working as, or during wireless signal interruption, then MME determines that the downlink data of the UE is unreachable.

320, mobility management entity determines to need to send the second instruction message to data sending terminal；

330, mobility management entity sends second to data sending terminal and indicates message, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second.

It should be understood that it can be that MME indicates message via SCEF to server transmission downlink data transmission that MME sends downlink data to send instruction message to server.

For example, data gateway P-GW is received after downlink data, downlink data is forwarded to S-GW, S-GW receives downlink data, downlink data notification (Downlink Data Notification, DDN) message is sent to MME.UE marks are carried in DDN message.MME detects UE temporarily unreachable (such as UE enables PSM or eDRX), determines caching downlink data.MME sends downlink data notification to gateway S-GW and confirms (Downlink Data Notification Acknowledgment, DDNA) message, and DDNA message is used to indicate that S-GW caches downlink data；For example, caching downlink data within the duration, MME determines that needs send downlink data transmission to server and indicate that message downstream data send instruction message and can include the information of duration according to UE mark；S-GW is indicated according to MME and is cached service condition, the information such as the strategy data cached bag number M of decision is locally configured, and starts timer T caching downlink datas.When timer T time-out or the number of data packets received are more than M, S-GW will no longer data cached bag.MME sends downlink data to server and sends instruction message, and server server is sent according to downlink data indicates that message determines to send the downlink data of user equipment (UE) within the duration, does not send the downlink data of the UE in the time in addition to the duration.

Therefore, when the downlink data for the user equipment that the embodiment of the present invention can be sent in data sending terminal is unreachable, mobility management entity sends first to gateway and indicates message, indicating service gateway caching downlink data；And mobility management entity sends second to data sending terminal and indicates message, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within a certain duration, the user equipment is not sent in the time in addition to the duration Downlink data.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.

Alternatively, according to embodiments of the present invention, first indicate that message carries the configured information that indicating service gateway caches downlink data, configured information includes duration and/or number of data packets,

Second indicates that message carries configured information.

It should be understood that the number of data cached bag refers to that MME at most can be with the quantity of data cached bag for the S-GW S-GW configured.

It should be noted that can be that the request based on server (AS/SCS) decides whether that feedback second indicates that message or the information that is locally configured based on MME decide whether that feedback second indicates message in the embodiment of the present invention.Also, the second instruction message can be generated by MME, can also be generated by S-GW.Below for this several situation, it is described in detail respectively.

A kind of situation, when the embodiment of the present invention is that the request based on AS/SCS carries out the instruction message of feedback second, before 310, method also includes：

Mobility management entity obtains the first request message that data sending terminal is sent, first request message is used to ask network to feed back the second instruction message when the downlink data of user equipment is unreachable, first request message carries the address information of data sending terminal and the mark of user equipment

It should be understood that the address information of transmitting terminal can also be able to be location geographic information etc. with IP, the mark of user equipment can be ID, IP, IMEI code of user equipment etc., and the embodiment of the present invention is not limited to this.

For example, AS/SCS sends downlink data to SCEF sends instruction request message, request network feeds back configured information when UE is unreachable.AS/SCS IP address, UE marks and the request term of validity is carried in request message.The term of validity of request message can be only for the UE this downlink data transmission effectively or for the UE within a certain period of time all downlink datas transmission it is all effective.AS/SCS request message is forwarded to MME by SCEF.MME preserves the request message after receiving, and deletes after request message is expired the message.

Wherein, in 320, if mobility management entity determines that the mark of user equipment of the mark of user equipment with being carried in the first request message is identical, mobility management entity determines to need to send the second instruction message to data sending terminal.

Further, when the second instruction message can be generated by MME, before 330, this method also includes：

Mobility management entity generation second indicates message.

For example, MME detects UE temporarily unreachable (such as UE enables PSM, eDRX), certainly Surely downlink data is cached.MME sends downlink data notification to S-GW and confirms (DDNA) message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.MEE decides whether that feeding back downlink data send configured information according to UE marks, if the UE marks in DDN message are identical with the UE marks in AS/SCS request messages, and MME generation downlink datas, which are sent, indicates message, and is sent to AS/SCS via SCEF.

Alternately, when the second instruction message can be generated by S-GW, the first instruction message is additionally operable to indicating service gateway generation second and indicates message, wherein, before 330, this method also includes：

Mobility management entity receives the second instruction message that gateway is sent.

For example, being detected in MME, UE is interim unreachable (such as UE enables PSM, eDRX), and decision caches downlink data.Meanwhile, MEE identifies decision according to UE needs feeding back downlink data to send instruction message.MME sends downlink data notification and confirms (DDNA) message to S-GW, indicates that S-GW needs to cache downlink data, and caching duration T, and data cached bag number N (optional).Meanwhile, MME informs that S-GW needs feeding back downlink data to send and indicates message, and provides AS/SCS IP address.S-GW, which indicates according to MME and cache service condition, the information such as strategy are locally configured determines data cached bag number M, and generates downlink data and send and indicate that message is sent to MME.S-GW simultaneously starts timer T caching downlink datas, and when the number of data packets that timer T is overtime or receives is more than M, S-GW will no longer data cached bag.MME converting downlinks data, which are sent, indicates message, and AS/SCS is sent to via SCEF.

Another situation, when the embodiment of the present invention is that the information of being locally configured based on MME decides whether that feeding back downlink data send instruction message, that is, in this case, being pre-configured with MME needs feeding back downlink data to send the list (default feedback indicator list) for indicating message, UE marks are contained in the list, i.e., UE all downlink datas are required for providing feedback message when UE is unreachable in list.

Alternatively, in 320, if mobility management entity determines the mark identical mark for having with user equipment in default feedback indicator list, then mobility management entity determines to need to send the second instruction message to data sending terminal, wherein, default feedback indicator list includes the mark for the user equipment for needing feedback second to indicate message.

Further, when the second instruction message can be generated by MME, the first instruction message is additionally operable to the address information that indicating service gateway sends data sending terminal to mobility management entity, and before 330, this method also includes：

Mobility management entity receives the address information for the data sending terminal that gateway is sent；

Mobility management entity generation second indicates message, and second indicates that message carries the address information of data sending terminal.

For example, MME is detected, UE is interim unreachable (such as UE enables PSM or eDRX), and decision caches downlink data.MEE identifies the list that inquiry is locally configured according to UE, decides whether that feeding back downlink data are sent and indicates message.If desired for feedback, then MME also needs to ask to provide AS/SCS IP address to S-GW.That is MME sends downlink data notification to S-GW and confirms (DDNA) message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.Meanwhile, MME also asks to provide AS/SCS IP address to S-GW.S-GW indicates that log-on data bag detects function according to MME, obtains the corresponding AS/SCS of downlink data packet IP address, and feeds back to MME.The AS/SCS IP address generation downlink data that MME is provided according to S-GW, which is sent, indicates message, and is sent to AS/SCS via SCEF.

Alternately, when the second instruction message can be generated by S-GW, the first instruction message is additionally operable to indicating service gateway generation second and indicates message, and before 330, this method also includes：Mobility management entity receives the second instruction message that gateway is sent.

For example, MME is detected, UE is interim unreachable (such as UE enables PSM, eDRX), and decision caches downlink data.MEE identifies inquiry according to UE and list is locally configured, and decides whether that feeding back downlink data are sent and indicates message.MME sends downlink data notification to S-GW and confirms (DDNA) message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.Meanwhile, MME informs that S-GW needs feeding back downlink data to send and indicates message, and S-GW is indicated according to MME and cached service condition, the data cached bag number M of the information such as strategy decision is locally configured.S-GW indicates that log-on data bag detects function according to MME, obtains the corresponding AS/SCS of downlink data packet IP address, and generation downlink data, which is sent, indicates that message is sent to MME.MME converting downlinks data, which are sent, indicates message, and AS/SCS is sent to via SCEF.

Optionally, the embodiment of the present invention also includes：Mobility management entity receives the confirmation message that data sending terminal is sent, and confirmation message is used to indicate that data sending terminal has received the second instruction message.

It should be understood that the confirmation message in the embodiment of the present invention is referred to as indicating confirmation message or confirms to indicate message etc., the embodiment of the present invention is limited not to this.

For example, MME (passing through SCEF) sends downlink data to AS and sends instruction message, AS receives downlink data and sent after instruction message, (passing through SCEF) sends downlink data to MME and sends instruction confirmation message, MME is sent according to downlink data indicates that confirmation message knows that correct downlink data sends instruction message to AS, enter and send instruction message without resending (re-transmission) downlink data, improve net Network efficiency.

Above, the method for describing the data transfer of the embodiment of the present invention from mobility management entity side with reference to Fig. 3, the method for describing the data transfer of the embodiment of the present invention from data sending terminal side with reference to Fig. 4.

Fig. 4 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Method such as Fig. 5 can be performed by data sending terminal, and specifically, method as shown in Figure 5 includes：

410, data sending terminal obtains second and indicates message, and the second instruction message is generated after gateway receives the first instruction message, and first indicates that message is used for the downlink data that indicating service gateway caches the inaccessible user equipment of downlink data；

Specifically, the second instruction message can be generated by mobility management entity or generated by gateway, and the embodiment of the present invention is limited not to this.

420, data sending terminal indicates that message sends the downlink data of user equipment according to second.

For example, data gateway P-GW is received after downlink data, downlink data is forwarded to S-GW, S-GW receives downlink data, downlink data notification (DDN) message is sent to MME.UE marks are carried in DDN message.MME detects UE temporarily unreachable (such as UE enables PSM or eDRX), determines caching downlink data.MME sends downlink data notification to gateway S-GW and confirms DDNA message, and DDNA message is used to indicate that S-GW caches downlink data, for example, the downlink data is cached within the duration, for example, the downlink data is cached within the duration；MME determines to need to send downlink data transmission instruction message to data sending terminal according to UE mark, and downlink data, which is sent, indicates that message includes the information of duration；S-GW is indicated according to MME and is cached service condition, the information such as the strategy data cached bag number M of decision is locally configured, and starts timer T caching downlink datas.When timer T time-out or the number of data packets received are more than M, S-GW will no longer data cached bag.MME sends downlink data to data sending terminal and sends instruction message, and data sending terminal is sent according to downlink data indicates that message determines to send UE downlink data within the duration, does not send UE downlink data in the time in addition to the duration.

Therefore, the embodiment of the present invention can obtain second in data sending terminal and indicate message, second instruction message is generated after gateway receives the first instruction message, and first indicates that message is used for the downlink data that indicating service gateway caches the inaccessible user equipment of downlink data；Data sending terminal indicates that message sends the downlink data of user equipment according to second.For example, sending the downlink data of user equipment within a certain duration, the downlink data of the user equipment is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.

Alternatively, as another embodiment, first indicates that message carries the lower line number of indicating service gateway caching According to configured information, configured information include duration and/or number of data packets,

Second indicates that message carries configured information.

Wherein,

When configured information includes the duration, in 420, data sending terminal indicates that message determines to send the downlink data of user equipment within the duration according to second,

When configured information includes number of data packets, in 420, data sending terminal indicates that message sends the downlink data of user equipment according to second, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to number of data packets,

When configured information includes duration and number of data packets, in 420, data sending terminal is sent according to second indicates that message determines to send the downlink data of user equipment within the duration, and the quantity of the packet of the downlink data for the user equipment that data sending terminal is sent is less than or equal to number of data packets within the duration.

Further, as another embodiment, when configured information includes Duration Information, or configured information including duration and number of data packets, method also includes：

Data sending terminal determines not sending the downlink data of user equipment in the time in addition to the duration according to the second instruction message.

Alternatively, as another embodiment, before 410, this method also includes：

Data sending terminal sends the first request message, and the first request message is used to ask network to feed back the second instruction message when the downlink data of user equipment is unreachable, and the first request message carries the address information of data sending terminal and the mark of user equipment.

For example, data sending terminal (for example, AS or SCS) sends downlink data to SCEF sends instruction request message, request network feeds back configured information when UE is unreachable.AS/SCS IP address, UE marks and the request term of validity is carried in request message.The term of validity of request message can be only for the UE this downlink data transmission effectively or for the UE within a certain period of time all downlink datas transmission it is all effective.AS/SCS request message is forwarded to MME by SCEF.MME preserves the request message after receiving, and deletes after request message is expired the message.

Alternatively, present invention method also includes：

Data sending terminal sends confirmation message to mobility management entity, and confirmation message is used to indicate that data sending terminal has received the second instruction message.

For example, MME (passing through SCEF) sends downlink data to data sending terminal sends instruction message, data sending terminal receives downlink data and sent after instruction message, and (passing through SCEF) sends descending to MME Data, which are sent, indicates confirmation message, and MME indicates that confirmation message knows that correct downlink data transmission indicates message to data sending terminal, enters and sends instruction message without resending (re-transmission) downlink data, improves network efficiency according to downlink data transmission.

Above, the method for describing the data transfer of the embodiment of the present invention from mobility management entity side with reference to Fig. 3, the method for describing the data transfer of the embodiment of the present invention from data sending terminal side with reference to Fig. 4.The method for describing the data transfer of the embodiment of the present invention from gateway side with reference to Fig. 5 and Fig. 6.

Fig. 5 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Fig. 5 method can be performed by gateway, specifically, and method as shown in Figure 5 includes：

510, gateway receives the first instruction message that mobility management entity is sent, and first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and generates the second instruction message；

520, gateway obtains the address information of data sending terminal；

530, gateway generates and sends the second instruction message according to the instruction of the first instruction message and the address information of data sending terminal, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second.

For example, data gateway P-GW is received after downlink data, downlink data is forwarded to S-GW, S-GW receives downlink data, downlink data notification (DDN) message is sent to MME.UE marks are carried in DDN message.MME detects UE temporarily unreachable (such as UE enables PSM or eDRX), determines caching downlink data.MME sends downlink data notification to gateway S-GW and confirms DDNA message, and DDNA message is used to indicate that S-GW caches downlink data within the duration and generates downlink data transmission instruction message, for example, the downlink data is cached within the duration；MME determines to need to send downlink data transmission instruction message to data sending terminal according to UE mark, and downlink data, which is sent, indicates that message includes the information of duration；S-GW is indicated according to MME and is cached service condition, the information such as the strategy data cached bag number M of decision is locally configured, and starts timer T caching downlink datas.When timer T time-out or the number of data packets received are more than M, S-GW will no longer data cached bag.S-GW obtains the IP address information of data sending terminal；S-GW obtains the IP address information of data sending terminal, S-GW, which is generated according to the IP address information of the instruction according to DDNA message and data sending terminal and sent downlink data to MME, sends instruction message, downlink data, which is sent, indicates that message includes the information of duration, and then downlink data is sent and indicates that message is forwarded to data sending terminal by MME, data sending terminal downlink data, which is sent, indicates that message determines to send the downlink data of user equipment within the duration, does not send the downlink data of the UE in the time in addition to the duration.

Therefore, the embodiment of the present invention, when the downlink data for the user equipment that can be sent in data sending terminal is unreachable, gateway receives mobility management entity and sends the first instruction message, the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and the second instruction message is generated, gateway obtains the address information of data sending terminal；Gateway generates and sends the second instruction message according to the instruction of the first instruction message and the address information of data sending terminal, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within the duration, the downlink data of the UE is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.

Alternatively, first indicate that message carries the configured information that indicating service gateway caches downlink data, configured information includes duration and/or number of data packets,

Second indicates that message carries configured information.

It should be noted that can be that the request based on AS/SCS decides whether that feeding back the transmission of feeding back downlink data indicates that message or the information that is locally configured based on MME decide whether that feeding back downlink data send instruction message in the embodiment of the present invention.Also, the downlink data, which is sent, indicates that message can be generated by MME, can also be generated by S-GW.Below for this several situation, it is described in detail respectively.

A kind of situation, when the embodiment of the present invention is that the request based on AS/SCS carries out feeding back downlink data transmission instruction message, alternatively, first indicates that message carries the address information of data sending terminal, wherein, in 520, gateway indicates that message obtains the address information of data sending terminal according to first.

For example, AS/SCS sends downlink data to SCEF sends instruction request message, request network feeds back configured information when UE is unreachable.AS/SCS IP address, UE marks and the request term of validity is carried in request message.The term of validity of request message can be only for the UE this downlink data transmission effectively or for the UE within a certain period of time all downlink datas transmission it is all effective.AS/SCS request message is forwarded to MME by SCEF.MME preserves the request message after receiving, and deletes after request message is expired the message.UE is detected in MME temporarily unreachable (such as UE enables PSM, eDRX), determines caching downlink data.Meanwhile, MEE identifies decision according to UE needs feeding back downlink data to send instruction message.MME sends downlink data notification and confirms (DDNA) message to S-GW, indicates that S-GW needs to cache downlink data, and caching duration T, and data cached bag number N (optional).Meanwhile, MME informs that S-GW needs feeding back downlink data to send and indicates message, and provides AS/SCS IP address.S-GW, which indicates according to MME and cache service condition, the information such as strategy are locally configured determines data cached bag number M, and generates downlink data and send and indicate that message is sent to MME.MME converting downlinks data, which are sent, indicates message, is sent to via SCEF AS/SCS。

Another situation, when the embodiment of the present invention be based in MME be locally configured information decide whether feeding back downlink data send indicate message when, that is, in this case, being pre-configured with MME needs feeding back downlink data to send the list (default feedback indicator list) for indicating message, UE marks are contained in the list, i.e., UE all downlink datas are required for providing feedback message when UE is unreachable in list.

Alternatively, the first instruction message is additionally operable to the address information that indicating service gateway obtains data sending terminal,

Wherein, in 520, gateway indicates that the instruction of message carries out the detection of downlink data according to first, obtains the address information of data sending terminal.

Fig. 6 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Fig. 6 method can be performed by gateway, specifically, and method as shown in Figure 6 includes：

610, gateway receives the first instruction message that mobility management entity is sent, and first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and obtains the address information of data sending terminal；

620, gateway indicates that the instruction of message carries out the detection of downlink data according to first, obtains the address information of data sending terminal；

630, gateway sends the address information of data sending terminal to mobility management entity, message is indicated in order to which mobility management entity generates according to the address information of data sending terminal and sends second to data sending terminal, so that data sending terminal indicates that message sends the downlink data of user equipment according to second.

For example, MME is detected, UE is interim unreachable (such as UE enables PSM or eDRX), and decision caches downlink data.MEE identifies the list that inquiry is locally configured according to UE, decides whether that feeding back downlink data are sent and indicates message.If desired for feedback, then MME also needs to ask to provide AS/SCS IP address to S-GW.That is MME sends downlink data notification to S-GW and confirms (DDNA) message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.Meanwhile, MME also asks to provide AS/SCS IP address to S-GW.S-GW indicates that log-on data bag detects function according to MME, obtains the corresponding AS/SCS of downlink data packet IP address, and feeds back to MME.S-GW simultaneously starts timer T caching downlink datas, and when the number of data packets that timer T is overtime or receives is more than M, S-GW will no longer data cached bag.MME generates downlink data according to the S-GW AS/SCS provided IP address and sends instruction message, and is sent to AS/SCS via SCEF.AS/SCS is sent according to downlink data indicates that message determines to send within the duration The downlink data of user equipment (UE), does not send the downlink data of the UE in the time in addition to the duration.

Therefore, the embodiment of the present invention receives the first instruction message that mobility management entity is sent by gateway, first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and obtains the address information of data sending terminal；The instruction for indicating message according to first carries out the detection of downlink data, obtains the address information of data sending terminal；The address information of data sending terminal is sent to mobility management entity, message is indicated in order to which mobility management entity generates according to the address information of data sending terminal and sends second to data sending terminal, so that data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within the duration, this downlink data is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.

Second indicates that message carries configured information.

Above, the method for describing the data transfer of the embodiment of the present invention from mobility management entity side with reference to Fig. 3, the method for describing the data transfer of the embodiment of the present invention from data sending terminal side with reference to Fig. 4, the method for describing the data transfer of the embodiment of the present invention from gateway side with reference to Fig. 5 and Fig. 6.The method of the data transfer of the embodiment of the present invention is described in detail with reference to Fig. 7 to Figure 10 specific examples.

Fig. 7 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Fig. 7 embodiments describe downlink data transmission and indicate that message is generated by MME, and the request based on AS/SCS decides whether to feed back the message.

Specifically, method as shown in Figure 7 includes：

701, AS/SCS send downlink data to SCEF sends instruction request message, and request network feeds back configured information when UE is unreachable.AS/SCS IP address, UE marks and the request term of validity is carried in request message.The term of validity of request message can be only for the UE this downlink data transmission effectively or for the UE within a certain period of time all downlink datas transmission it is all effective.

AS/SCS request message is forwarded to MME by 702, SCEF.MME preserves the request message after receiving, and deletes after request message is expired the message.

703, user equipment is in Idle state, and P-GW receives downlink data, forwards the data to S-GW.

704, S-GW receive downlink data, send downlink data notification DDN message to MME.UE marks are carried in message.

705, MME detect UE temporarily unreachable (such as UE enables PSM, eDRX), determine caching downlink data.

706, MME send downlink data notification to S-GW confirms DDNA message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.

707, MME send downlink data to AS sends instruction message.

Specifically, MEE decides whether that feeding back downlink data send configured information according to UE marks, if the UE marks in DDN message are identical with the UE marks in AS/SCS request messages, and MME generation downlink datas, which are sent, indicates message, and is sent to AS/SCS via SCEF.

Wherein, the downlink data of MME generations, which is sent, indicates that message includes caching duration T, alternatively can also further comprise the data cached bag number N of MME decision-makings.

708, AS/SCS alternatively send downlink data to network sends instruction confirmation message.

709, S-GW indicate according to MME and cache service condition, the information such as the strategy data cached bag number M of decision is locally configured, and start timer T caching downlink datas.When timer T time-out or the number of data packets received are more than the packet that M, S-GW have cached discarding.

Therefore, the embodiment of the present invention, sends request message, request feeding back downlink data when UE is unreachable, which are sent, indicates message by AS/SCS to network.Request generation downlink datas of the MME based on AS/SCS, which is sent, indicates message, and the information such as caching duration T and the data cached bag number N of MME decision-makings is fed back to AS/SCS.AS/SCS can determine when stop the transmission or re-transmission of downlink data packet according to the instruction of network, so as to avoid unnecessary packet from transmitting, improve the service efficiency of Internet resources.

Fig. 8 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Fig. 8 embodiments describe downlink data transmission and indicate that message is generated by S-GW, and the request based on AS/SCS decides whether to feed back the message.

Specifically, method as shown in Figure 8 includes：

801, AS/SCS send downlink data to SCEF sends instruction request message, and request network feeds back configured information when UE is unreachable.AS/SCS IP address, UE marks and the request term of validity is carried in request message.The term of validity of request message can be only for the UE this downlink data transmission effectively or for the UE within a certain period of time all downlink datas transmission it is all effective.

AS/SCS request message is forwarded to MME by 802, SCEF.MME preserves the request message after receiving, and deletes after request message is expired the message.

Specific downlink data handling process is as follows：

803, user equipment is in Idle state, and P-GW receives downlink data, forwards the data to S-GW.

804, S-GW receive downlink data, send downlink data notification (DDN) message to MME.UE marks are carried in message.

805, MME detect UE temporarily unreachable (such as UE enables PSM, eDRX), determine caching downlink data.Meanwhile, MEE decides whether that feeding back downlink data are sent according to UE marks and indicates message, if the UE marks in DDN message are identical with the UE marks in AS/SCS request messages, needs to provide feedback message.

806, MME, which send downlink data notification, confirms (DDNA) message to S-GW, indicates that S-GW needs to cache downlink data, and caching duration T and data cached bag number N (optional).Meanwhile, MME informs that S-GW needs feeding back downlink data to send and indicates message, and provides AS/SCS IP address.

807, S-GW send downlink data to MME sends instruction message.

Specifically, S-GW is indicated according to MME and is cached service condition, the information such as strategy are locally configured determine data cached bag number M, and is generated downlink data and sent and indicate that message is sent to MME.

Wherein, the downlink data of S-GW generations, which sends configured information, can include the data cached bag number N of caching duration T, and S-GW decision-makings.

808,807, MME send downlink data to AS sends instruction message

Specifically, MME converting downlinks data, which are sent, indicates message, and AS/SCS is sent to via SCEF.

809, AS/SCS alternatively send downlink data to network sends instruction confirmation message.

810, S-GW start timer T caching downlink datas.When timer T time-out or the number of data packets received are more than the packet that M, S-GW have cached discarding.

Therefore, the embodiment of the present invention sends request message by AS/SCS to network, and request feeding back downlink data when UE is unreachable send configured information.Request generation downlink datas of the S-GW based on AS/SCS, which is sent, indicates message, and the information such as the data cached bag number M of caching duration T and S-GW decision-makings are fed back to AS/SCS.AS/SCS can determine when stop the transmission or re-transmission of downlink data packet according to the instruction of network, so as to avoid unnecessary packet from transmitting, improve the service efficiency of Internet resources.

Fig. 9 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Fig. 9 embodiments are sent present embodiment describes downlink data indicates that message is generated by MME, and the information that is locally configured based on MME decides whether to feed back the message.Being pre-configured with MME needs feeding back downlink data to send a list for indicating message, and UE marks are contained in the list, i.e., UE all downlink datas are required for providing feedback message when UE is unreachable in list.

Specifically, method as shown in Figure 9 includes：

901, user equipment is in Idle state, and P-GW receives downlink data, forwards the data to S-GW.

902, S-GW receive downlink data, send downlink data notification (DDN) message to MME.UE marks are carried in message.

903, MME detect UE temporarily unreachable (such as UE enables PSM, eDRX), determine caching downlink data.MEE identifies inquiry according to UE and list is locally configured, and decides whether that feeding back downlink data are sent and indicates message.If desired for feedback, then MME also needs to ask to provide AS/SCS IP address to S-GW.

904, MME send downlink data notification to S-GW confirms (DDNA) message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.Meanwhile, MME also asks to provide AS/SCS IP address to S-GW.

905, S-GW send AS/SCS IP address to MME.

Specifically, S-GW indicates that log-on data bag detects function according to MME, obtains the corresponding AS/SCS of downlink data packet IP address, and feeds back to MME.

906, MME send downlink data to AS sends instruction message

Specifically, the AS/SCS IP address generation downlink data that MME is provided according to S-GW, which is sent, indicates message, and is sent to AS/SCS via SCEF.

907, AS/SCS alternatively send downlink data to network sends instruction confirmation message.

908, S-GW indicate according to MME and cache service condition, the information such as the strategy data cached bag number M of decision is locally configured, and start timer T caching downlink datas.When timer T time-out or the number of data packets received are more than the packet that M, S-GW have cached discarding.

Therefore the embodiment of the present invention decides whether that feeding back downlink data send instruction message when UE is unreachable by MME based on information is locally configured, and instruction message is sent by MME generation downlink datas, to the AS/SCS feedback caching information such as duration T and data cached bag number N.AS/SCS can determine when stop the transmission or re-transmission of downlink data packet according to the instruction of network, so as to avoid unnecessary packet from transmitting, improve the service efficiency of Internet resources.

Figure 10 is the indicative flowchart of the method for data transfer according to another embodiment of the present invention.Fig. 8 embodiments are sent present embodiment describes downlink data indicates that message is generated by S-GW, and the information that is locally configured based on MME decides whether to feed back the message.Being pre-configured with MME needs feeding back downlink data to send a list for indicating message, and UE marks, i.e. UE in list are contained in the list All downlink datas be required for when UE is unreachable provide feedback message.

Specifically, method as shown in Figure 10 includes：

1001, user equipment is in Idle state, and P-GW receives downlink data, forwards the data to S-GW.

1002, S-GW receive downlink data, send downlink data notification (DDN) message to MME.UE marks are carried in message.

1003, MME detect UE temporarily unreachable (such as UE enables PSM, eDRX), determine caching downlink data.MEE identifies inquiry according to UE and list is locally configured, and decides whether that feeding back downlink data are sent and indicates message.

1004, MME send downlink data notification to S-GW confirms (DDNA) message, indicates that S-GW needs caching downlink data and caches duration T, alternatively also includes data cached bag number N.Meanwhile, MME informs that S-GW needs feeding back downlink data to send and indicates message.

1005, S-GW send downlink data to MME sends instruction message.

Specifically, S-GW is indicated according to MME and is cached service condition, the data cached bag number M of the information such as strategy decision is locally configured.S-GW indicates that log-on data bag detects function according to MME, obtains the corresponding AS/SCS of downlink data packet IP address, and generation downlink data, which is sent, indicates that message is sent to MME.

Wherein, S-GW generation downlink data send configured information include caching duration T, and S-GW decision-makings data cached bag number N.

1006, MME send downlink data to AS sends instruction message.

1007, AS/SCS alternatively send downlink data to network sends instruction confirmation message.

1008, S-GW start timer T caching downlink datas.When timer T time-out or the number of data packets received are more than the packet that M, S-GW have cached discarding.

Therefore, the embodiment of the present invention decides whether that feeding back downlink data send instruction message when UE is unreachable by MME based on information is locally configured, and instruction message is sent by S-GW generation downlink datas, to the AS/SCS feedback caching information such as duration T and data cached bag number N.AS/SCS can determine when stop the transmission or re-transmission of downlink data packet according to the instruction of network, so as to avoid unnecessary packet from transmitting, improve the service efficiency of Internet resources.

Above, the method for the data transfer of the embodiment of the present invention, the equipment that the data transfer of the embodiment of the present invention is described with reference to Figure 11 to Figure 17 are described in detail with reference to Fig. 1 to Figure 10.

It should be understood that, mobility management entity shown in Figure 11 is corresponding with Fig. 3 embodiments of the method, it can realize that Fig. 3 is related to each process of mobility management entity in implementing, the concrete function of mobility management entity 1100 shown in Figure 11 can refer to each process completed in Fig. 3 by mobility management entity, to avoid repeating, appropriate omit is described in detail herein.

Mobility management entity 1100 as shown in figure 11 includes：First determining unit 1110, the second determining unit 1120 and transmitting element 1130.

Specifically, the first determining unit 1110 is used for when the downlink data of the user equipment of data sending terminal transmission is unreachable, and sending first to gateway indicates message, and first indicates that message is used for indicating service gateway caching downlink data；

Second determining unit 1120 is used to determine to need to send the second instruction message to data sending terminal；

Transmitting element 1130 is used to send the second instruction message to data sending terminal, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second.

Therefore, when the downlink data for the user equipment that the embodiment of the present invention can be sent in data sending terminal is unreachable, mobility management entity sends first to gateway and indicates message, indicating service gateway caching downlink data；And mobility management entity sends second to data sending terminal and indicates message, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within a certain duration, the downlink data of the user equipment is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.

Alternatively, as another embodiment, first indicates that message carries the configured information that indicating service gateway caches downlink data, and configured information includes duration and/or number of data packets,

Second indicates that message carries configured information.

Alternatively, as another embodiment, mobility management entity 1100 also includes：

Acquiring unit, for the first determining unit it is determined that data sending terminal send user equipment downlink data it is unreachable when, before the first instruction message being sent to gateway, obtain the first request message that data sending terminal is sent, first request message is used to ask network to feed back the second instruction message when the downlink data of user equipment is unreachable, first request message carries the address information of data sending terminal and the mark of user equipment

Wherein, the second determining unit 1120 is if it is determined that the mark for identifying the user equipment with being carried in the first request message of user equipment is identical, it is determined that need to send the second instruction message to data sending terminal.

First generation unit, for before transmitting element sends the second instruction message to data sending terminal, generation second to indicate message.

Alternatively, as another embodiment, the first instruction message is additionally operable to indicating service gateway generation second and indicates message, and mobility management entity 1100 also includes：

Receiving unit, message is indicated for before transmitting element sends downlink data transmission the second instruction message to data sending terminal, receiving gateway is sent second.

Alternatively, it is used as another embodiment, if it is determined that there is the mark identical mark with user equipment in default feedback indicator list in the first determining unit 1110, then determine to need to send the second instruction message to data sending terminal, wherein, default feedback indicator list includes the mark for the user equipment for needing feedback second to indicate message.

Alternatively, as another embodiment, the first instruction message is additionally operable to the address information that indicating service gateway sends data sending terminal to mobility management entity, and mobility management entity also includes：

First receiving unit, for before transmitting element sends downlink data transmission configured information to data sending terminal, receiving the address information for the data sending terminal that gateway is sent；

Second generation unit, for before transmitting element sends downlink data transmission configured information to data sending terminal, the instruction message of generation second, the second instruction message to carry the address information of data sending terminal.

Second receiving unit, message is indicated for before transmitting element sends the second instruction message to the data sending terminal, receiving gateway is sent second.

3rd receiving unit, the confirmation message for receiving data sending terminal transmission, confirmation message is used to indicate that data sending terminal has received the second instruction message.

It should be understood that, data sending terminal shown in Figure 12 is corresponding with Fig. 4 embodiments of the method, it can realize that Fig. 4 is related to each process of data sending terminal in implementing, the concrete function of data sending terminal 1200 shown in Figure 12 can refer to each process completed in Fig. 4 by data sending terminal, to avoid repeating, appropriate omit is described in detail herein.

Data sending terminal 1200 as shown in figure 12 includes：The transmitting element 1220 of acquiring unit 1210 and first.

Specifically, acquiring unit 1210 is used to obtain the second instruction message, and the second instruction message is in clothes Business gateway receives what is generated after the first instruction message, and first indicates that message is used for the downlink data that indicating service gateway caches the inaccessible user equipment of downlink data；

First transmitting element 1220 is used to indicate that message sends the downlink data of user equipment according to second.

Alternatively, as another embodiment,

Second indicates that message carries the configured information of cached in serving gateway downlink data, and configured information includes duration and/or number of data packets,

Wherein,

When configured information includes the duration, the first transmitting element 1220 indicates that message determines to send the downlink data of user equipment within the duration according to second,

When configured information includes number of data packets, the first transmitting element 1220 indicates that message sends the downlink data of user equipment according to second, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to number of data packets,

When configured information includes duration and number of data packets, first transmitting element 1220 indicates that message determines to send the downlink data of user equipment within the duration according to second, and the quantity of the packet of the downlink data for the user equipment that data sending terminal is sent is less than or equal to number of data packets within the duration.

Alternatively, as another embodiment, when configured information includes duration, or configured information including duration and number of data packets, data sending terminal 1200 also includes：

Determining unit, for determining not sending the downlink data of user equipment in the time in addition to the duration according to the second instruction message.

Alternatively, as another embodiment, data sending terminal 1200 also includes：

Second transmitting element, for before acquiring unit 1210 obtains the second instruction message, send the first request message, first request message is used to ask network to feed back the second instruction message when the downlink data of user equipment is unreachable, and the first request message carries the address information of data sending terminal and the mark of user equipment.

3rd transmitting element, sends confirmation message, confirmation message is used to indicate that data sending terminal has received the second instruction message for sending downlink data to mobility management entity.

It should be understood that, server shown in Figure 13 is corresponding with Fig. 5 embodiments of the method, it can realize that Fig. 5 is related to each process of gateway in implementing, the concrete function of gateway 1300 shown in Figure 13 can refer to each process completed in Fig. 5 by gateway, to avoid repeating, appropriate omit is described in detail herein.

Gateway 1300 includes as shown in fig. 13 that：Receiving unit 1310, acquiring unit 1320 and transmitting element 1330.

Specifically, receiving unit is used for the first instruction message for receiving mobility management entity transmission, and first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and generates the second instruction message；

Acquiring unit 1320 is used for the address information for obtaining data sending terminal；

Transmitting element 1330 is used to generate and send the second instruction message according to the instruction of the first instruction message and the address information of data sending terminal, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second.

Second indicates that message carries configured information.

Alternatively, as another embodiment, first indicates that message carries the address information of data sending terminal,

Wherein, acquiring unit 1320 indicates that message obtains the address information of data sending terminal according to first.

Alternatively, as another embodiment, the first instruction message is additionally operable to indicating service gateway and obtains data The address information of transmitting terminal,

Wherein, acquiring unit 1320 indicates that the instruction of message carries out the detection of downlink data according to first, obtains the address information of data sending terminal.

It should be understood that, server shown in Figure 14 is corresponding with Fig. 6 embodiments of the method, it can realize that Fig. 6 is related to each process of gateway in implementing, the concrete function of gateway 1800 shown in Figure 14 can refer to each process completed in Fig. 6 by gateway, to avoid repeating, appropriate omit is described in detail herein.

Gateway 1400 as shown in figure 14 includes：Receiving unit 1410, acquiring unit 1420 and transmitting element 1430.

Specifically, receiving unit 1410 is used for the first instruction message for receiving mobility management entity transmission, first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and obtains the address information of data sending terminal；

Acquiring unit 1420 is used to indicate that the instruction of message carries out the detection of downlink data according to first, obtains the address information of data sending terminal；

Transmitting element 1430 is used for the address information that data sending terminal is sent to mobility management entity, message is indicated in order to which mobility management entity generates according to the address information of data sending terminal and sends second to data sending terminal, so that data sending terminal indicates that message sends the downlink data of user equipment according to second.

Therefore, the embodiment of the present invention receives the first instruction message that mobility management entity is sent by gateway, first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and obtains the address information of data sending terminal；The instruction for indicating message according to first carries out the detection of downlink data, obtains the address information of data sending terminal；The address information of data sending terminal is sent to mobility management entity, message is indicated in order to which mobility management entity generates according to the address information of data sending terminal and sends second to data sending terminal, so that data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within the duration, this downlink data is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.Alternatively, as another embodiment, first indicates that message carries the configured information that indicating service gateway caches downlink data, and configured information includes duration and/or number of data packets,

Second indicates that message carries configured information.

Figure 15 is the schematic block diagram of mobility management entity according to another embodiment of the present invention.Mobility management entity 1500 as shown in figure 15 includes：Processor 1510, memory 1520, bus system 1530 and transceiver 1540.

It should be understood that, receiving device 1500 shown in Figure 15 is corresponding with the mobility management entity shown in Figure 11, each process for being related to mobility management entity in embodiment of the method shown in Fig. 3 can be realized, the concrete function of mobility management entity 1500 shown in Figure 15 can refer to each process completed in Fig. 3 by mobility management entity, to avoid repeating, appropriate omit is described in detail herein.

Specifically, processor 1510 is used to call the code being stored in memory 1520 by bus system 1530, when the downlink data of the user equipment sent in data sending terminal is unreachable, sends first to gateway and indicate message, first indicates that message is used for indicating service gateway and caches downlink data；And determine to need to send the second instruction message to data sending terminal, transceiver 1540 sends second to data sending terminal and indicates message, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second.

The method that the embodiments of the present invention are disclosed can apply in processor 1510, or be realized by processor 1510.Processor 1510 is probably a kind of IC chip, the disposal ability with signal.In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1510 or the instruction of software form.Above-mentioned processor 1510 can be general processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components.It can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be microprocessor or the processor can also be any conventional processor etc..The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processor and perform completion, or perform completion with the hardware in decoding processor and software module combination.Software module can be located at random access memory (Random Access Memory, RAM), flash memory, only Read in the ripe storage medium in this area such as memory (Read-Only Memory, ROM), programmable read only memory or electrically erasable programmable memory, register.The storage medium is located at memory 1520, processor 1510 reads the information in memory 1520, the step of completing the above method with reference to its hardware, the bus system 1530 can also include power bus, controlling bus and status signal bus in addition etc. in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 1530 in figure.

Second indicates that message carries configured information.

Alternatively, it is used as another embodiment, processor 1510 is additionally operable to when the downlink data of the user equipment of data sending terminal transmission is unreachable, before the first instruction message being sent to gateway, obtain the first request message that data sending terminal is sent, first request message is used to ask network to feed back the second instruction message when user equipment is unreachable, and the first request message carries the address information of data sending terminal and the mark of user equipment

Wherein, processor 1510 is if it is determined that the mark for identifying the user equipment with being carried in the first request message of user equipment is identical, it is determined that need to send the second instruction message to data sending terminal.

Alternatively, as another embodiment, processor 1510 is additionally operable to before transceiver 1540 sends the second instruction message to data sending terminal, and generation second indicates message.

Alternatively, it is used as another embodiment, first instruction message is additionally operable to indicating service gateway generation second and indicates message, and transceiver 1540 is additionally operable to before transmitting element indicates message to data sending terminal transmission downlink data transmission second, receives the second instruction message that gateway is sent.

Alternatively, it is used as another embodiment, if it is determined that there is the mark identical mark with user equipment in default feedback indicator list in processor 1510, then determine to need to send the second instruction message to data sending terminal, wherein, default feedback indicator list includes the mark for the user equipment for needing feedback second to indicate message.

Alternatively, it is used as another embodiment, first instruction message is additionally operable to the address information that indicating service gateway sends data sending terminal to mobility management entity, before transceiver 1540 sends downlink data transmission configured information to data sending terminal, transceiver 1540 is additionally operable to receive the address information for the data sending terminal that gateway is sent；

Processor 1510 is additionally operable to generation second and indicates message, and second indicates that message carries the address information of data sending terminal.

Alternatively, indicate that message is additionally operable to indicating service gateway generation the second instruction message as another embodiment first, transceiver 1540 is additionally operable to before transmitting element sends the second instruction message, receive the second instruction message that gateway is sent.

Alternatively, as another embodiment, transceiver 1540 is additionally operable to the confirmation message for receiving data sending terminal transmission, and confirmation message is used to indicate that data sending terminal has received the second instruction message.

Figure 16 is the schematic block diagram of data sending terminal according to another embodiment of the present invention.Data sending terminal as shown in figure 16 includes：Processor 1610, memory 1620, bus system 1630 and transceiver 1640.

It should be understood that, data sending terminal 1600 shown in Figure 16 is corresponding with the data sending terminal shown in Figure 12, it can realize that Fig. 4 is related to each process of data sending terminal in implementing, the concrete function of data sending terminal 1600 shown in Figure 16 can refer to each process completed in Fig. 4 by data sending terminal, to avoid repeating, appropriate omit is described in detail herein.

Specifically, processor 1610 is used to call the code being stored in memory 1620 by bus system 1630, obtain second and indicate message, second instruction message is generated after gateway receives the first instruction message, and first indicates that message is used for the downlink data that indicating service gateway caches the inaccessible user equipment of downlink data；Transceiver 1640 is used to indicate that message sends the downlink data of user equipment according to second.

The method that the embodiments of the present invention are disclosed can apply in processor 1610, or be realized by processor 1610.Processor 1610 is probably a kind of IC chip, the disposal ability with signal.In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1610 or the instruction of software form.Above-mentioned processor 1610 can be general processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components.It can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be microprocessor or the processor can also be any conventional place Manage device etc..The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processor and perform completion, or perform completion with the hardware in decoding processor and software module combination.Software module can be located at random access memory (Random Access Memory, RAM), in the ripe storage medium in this area such as flash memory, read-only storage (Read-Only Memory, ROM), programmable read only memory or electrically erasable programmable memory, register.The storage medium is located at memory 1620, processor 1610 reads the information in memory 1620, the step of completing the above method with reference to its hardware, the bus system 1630 can also include power bus, controlling bus and status signal bus in addition etc. in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 1630 in figure.

Alternatively, as another embodiment, second indicates that message carries the configured information of cached in serving gateway downlink data, and configured information includes duration and/or number of data packets, wherein,

When configured information includes the duration, transceiver 1640 indicates that message determines to send the downlink data of user equipment within the duration according to second,

When configured information includes number of data packets, transceiver 1640 indicates that message sends the downlink data of user equipment according to second, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to number of data packets,

When configured information includes duration and number of data packets, institute's transceiver 1640 indicates that message determines to send the downlink data of user equipment within the duration according to second, and the quantity of the packet of the downlink data for the user equipment that data sending terminal is sent is less than or equal to number of data packets within the duration.

Alternatively, it is used as another embodiment, when configured information includes duration, or configured information including duration and number of data packets, transceiver 1640 is additionally operable to determine not sending the downlink data of user equipment in the time in addition to the duration according to the second instruction message.

Alternatively, it is used as another embodiment, transceiver 1640 is additionally operable to before the second instruction message is obtained, send the first request message, first request message is used to ask network to feed back the second instruction message when user equipment is unreachable, and the first request message carries the address information of data sending terminal and the mark of user equipment.

Alternatively, as another embodiment, transceiver 1640 is additionally operable to send downlink data transmission confirmation message to mobility management entity, and confirmation message is used to indicate that data sending terminal has received the second instruction message.

Figure 17 is the schematic block diagram of gateway according to another embodiment of the present invention.Gateway as shown in figure 17 includes：Processor 1710, memory 1720, bus system 1730 and transceiver 1740.

It should be understood that, gateway 1700 shown in Figure 17 is corresponding with the gateway shown in Figure 13, it can realize that Fig. 5 is related to each process of gateway in implementing, the concrete function of gateway 1700 shown in Figure 17 can refer to each process completed in Fig. 5 by gateway, to avoid repeating, appropriate omit is described in detail herein.

Specifically, processor 1710 is used to call the code being stored in memory 1720 by bus system 1730, receive the first instruction message that mobility management entity is sent, first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and the second instruction message is generated, and obtain the address information of data sending terminal；Transceiver 1740 is used to generate and send the second instruction message according to the instruction of the first instruction message and the address information of data sending terminal, in order to which data sending terminal indicates that message sends the downlink data of user equipment according to second.

The method that the embodiments of the present invention are disclosed can apply in processor 1710, or be realized by processor 1710.Processor 1710 is probably a kind of IC chip, the disposal ability with signal.In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1710 or the instruction of software form.Above-mentioned processor 1710 can be general processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components.It can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be microprocessor or the processor can also be any conventional processor etc..The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processor and perform completion, or perform completion with the hardware in decoding processor and software module combination.Software module can positioned at random access memory (Random Access Memory, RAM), flash memory, read-only storage (Read-Only Memory, ROM), programmable read only memory or electrically-erasable In the ripe storage medium in this areas such as programmable memory, register.The storage medium is located at memory 1720, processor 1710 reads the information in memory 1720, the step of completing the above method with reference to its hardware, the bus system 1730 can also include power bus, controlling bus and status signal bus in addition etc. in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 1730 in figure.

Second indicates that message carries configured information.

Wherein, transceiver 1740 indicates that message obtains the address information of data sending terminal according to first.

Alternatively, as another embodiment, the first instruction message is additionally operable to the address information that indicating service gateway obtains data sending terminal,

Wherein, processor 1710 indicates that the instruction of message carries out the detection of downlink data according to first, obtains the address information of data sending terminal.

Figure 18 is the schematic block diagram of gateway according to another embodiment of the present invention.Gateway as shown in figure 18 includes：Processor 1810, memory 1820, bus system 1830 and transceiver 1840.

It should be understood that, gateway 1800 shown in Figure 18 is corresponding with the gateway shown in Figure 14, it can realize that Fig. 6 is related to each process of gateway in implementing, the concrete function of gateway 1800 shown in Figure 18 can refer to each process completed in Fig. 6 by gateway, to avoid repeating, appropriate omit is described in detail herein.

Specifically, transceiver 1840 is used for the first instruction message for receiving mobility management entity transmission, first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and obtains the address information of data sending terminal；Processor 1810 is used to call the code being stored in memory 1820 by bus system 1830, and the instruction for indicating message according to first carries out the detection of downlink data, obtains the address information of data sending terminal；Transceiver 1840 sends the address information of data sending terminal to mobility management entity, message is indicated in order to which mobility management entity generates according to the address information of data sending terminal and sends second to data sending terminal, so that data sending terminal indicates that message sends the downlink data of user equipment according to second.

Therefore, the embodiment of the present invention receives the first instruction message that mobility management entity is sent by gateway, first indicates that message is used for the downlink data for the inaccessible user equipment of downlink data that the data cached transmitting terminal of indicating service gateway is sent, and obtains the address information of data sending terminal；Indicate to disappear according to first The instruction of breath carries out the detection of downlink data, obtains the address information of data sending terminal；The address information of data sending terminal is sent to mobility management entity, message is indicated in order to which mobility management entity generates according to the address information of data sending terminal and sends second to data sending terminal, so that data sending terminal indicates that message sends the downlink data of user equipment according to second, for example, the downlink data of user equipment is sent within the duration, this downlink data is not sent in the time in addition to the duration.So as to flexible transmission downlink data, it is to avoid unnecessary data transfer, network efficiency is improved.The method that the embodiments of the present invention are disclosed can apply in processor 1810, or be realized by processor 1810.Processor 1810 is probably a kind of IC chip, the disposal ability with signal.In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1810 or the instruction of software form.Above-mentioned processor 1810 can be general processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components.It can realize or perform disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be microprocessor or the processor can also be any conventional processor etc..The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processor and perform completion, or perform completion with the hardware in decoding processor and software module combination.Software module can be located at random access memory (Random Access Memory, RAM), in the ripe storage medium in this area such as flash memory, read-only storage (Read-Only Memory, ROM), programmable read only memory or electrically erasable programmable memory, register.The storage medium is located at memory 1820, processor 1810 reads the information in memory 1820, the step of completing the above method with reference to its hardware, the bus system 1830 can also include power bus, controlling bus and status signal bus in addition etc. in addition to including data/address bus.But for the sake of clear explanation, various buses are all designated as bus system 1830 in figure.

Second indicates that message carries configured information.

It should be understood that during " one embodiment " or " embodiment " that specification is mentioned in the whole text means that the special characteristic relevant with embodiment, structure or characteristic are included at least one embodiment of the present invention.Therefore, " in one embodiment " or " in one embodiment " occurred everywhere in entire disclosure not necessarily refers to identical embodiment.In addition, these specific feature, structure or characteristics can be combined in one or more embodiments in any suitable manner.It should be understood that in various embodiments of the present invention, it is above-mentioned The size of the sequence number of each process is not meant to the priority of execution sequence, and the execution sequence of each process should be determined with its function and internal logic, and any limit is constituted without tackling the implementation process of the embodiment of the present invention.

In addition, the terms " system " and " network " are often used interchangeably herein.The terms "and/or", only a kind of incidence relation for describing affiliated partner, represents there may be three kinds of relations, for example, A and/or B, can be represented：Individualism A, while there is A and B, these three situations of individualism B.In addition, character "/" herein, it is a kind of relation of "or" to typically represent forward-backward correlation object.

It should be understood that in embodiments of the present invention, " B " corresponding with A represents that B is associated with A, and B can be determined according to A.It is also to be understood that determining that B is not meant to determine B only according to A according to A, B can also be determined according to A and/or other information.

Those of ordinary skill in the art can be appreciated that, the unit and algorithm steps of each example described with reference to the embodiments described herein, it can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate the interchangeability of hardware and software, the composition and step of each example are generally described according to function in the above description.These functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel can realize described function to each specific application using distinct methods, but this realization is it is not considered that beyond the scope of this invention.

It is apparent to those skilled in the art that, for convenience of description and succinctly, the specific work process of the system of foregoing description, device and unit may be referred to the corresponding process in preceding method embodiment, will not be repeated here.

In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can realize by another way.For example, device embodiment described above is only schematical, for example, the division of the unit, it is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.In addition, shown or discussed coupling or direct-coupling or communication connection each other can be by the INDIRECT COUPLING of some interfaces, device or unit or communication connection or electricity, mechanical or other forms are connected.

The unit illustrated as separating component can be or may not be physically separate, and the part shown as unit can be or may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Some or all of unit therein can be selected to realize the purpose of scheme of the embodiment of the present invention according to the actual needs.

In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit or unit is individually physically present or two or more units are integrated in a unit.Above-mentioned integrated unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.

Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can be realized with hardware, or firmware is realized, or combinations thereof mode is realized.When implemented in software, above-mentioned functions can be stored in computer-readable medium or be transmitted as one or more instructions on computer-readable medium or code.Computer-readable medium includes computer-readable storage medium and communication media, and wherein communication media includes being easy to any medium that computer program is transmitted from a place to another place.Storage medium can be any usable medium that computer can be accessed.As example but it is not limited to：Computer-readable medium can include RAM, ROM, EEPROM, CD-ROM or other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can be used in carrying or store with instruct or data structure form desired program code and can by computer access any other medium.In addition.Any connection can be suitably turn into computer-readable medium.For example, if software is to be transmitted using coaxial cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line (DSL) or such as wireless technology of infrared ray, radio and microwave etc from website, server or other remote sources, then the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave etc be included in belonging to medium it is fixing in.As used in the present invention, disk (Disk) and dish (disc) include compression laser disc (CD), laser disc, laser disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the replicate data of the usual magnetic of which disk, and dish is then with laser come optical replicate data.Above combination above should also be as being included within the protection domain of computer-readable medium.

In a word, the preferred embodiment of technical solution of the present invention is the foregoing is only, is not intended to limit the scope of the present invention.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.

Claims

A kind of method of data transfer, it is characterised in that including：

When the downlink data for the user equipment that mobility management entity is sent in data sending terminal is unreachable, sends first to gateway and indicate message, the first instruction message is used to indicate downlink data described in the cached in serving gateway；

The mobility management entity determines to need to send the second instruction message to the data sending terminal；

The mobility management entity sends described second to the data sending terminal and indicates message, in order to which the data sending terminal indicates that message sends the downlink data of the user equipment according to described second.
According to the method described in claim 1, it is characterised in that

Described first indicates that message carries the configured information for indicating downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information.
Method according to claim 1 or 2, it is characterised in that

When the downlink data of the user equipment sent in the mobility management entity in data sending terminal is unreachable, before sending the first instruction message to gateway, methods described also includes：

The mobility management entity obtains the first request message that the data sending terminal is sent, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, first request message carries the address information of the data sending terminal and the mark of the user equipment

Wherein, the mobility management entity determines to need to send the second instruction message to the data sending terminal, including：

If the mobility management entity determines that the mark of user equipment of the mark of the user equipment with being carried in first request message is identical, the mobility management entity determines to need to send the second instruction message to the data sending terminal.
According to the method in any one of claims 1 to 3, it is characterised in that before the mobility management entity sends second configured information to the data sending terminal, in addition to：

The mobility management entity generation described second indicates message.
According to the method in any one of claims 1 to 3, it is characterised in that the first instruction message is additionally operable to indicate that the gateway generation described second indicates message,

Wherein, before the mobility management entity sends second configured information to the data sending terminal, in addition to：

The mobility management entity receives the second instruction message that the gateway is sent.
Method according to claim 1 or 2, it is characterised in that

The mobility management entity determines to need to send the second instruction message to the data sending terminal, including：

If the mobility management entity determines the mark identical mark for having with the user equipment in default feedback indicator list, then the mobility management entity determines to need to send the second instruction message to the data sending terminal, wherein, the default feedback indicator list includes the mark for needing to feed back the described second user equipment for indicating message.
Method according to claim 6, it is characterised in that

The first instruction message is additionally operable to indicate the address information that the gateway sends the data sending terminal to the mobility management entity, before the mobility management entity sends second configured information to the data sending terminal, methods described also includes：

The mobility management entity receives the address information for the data sending terminal that the gateway is sent；

The mobility management entity generation described second indicates message, and described second indicates that message carries the address information of the data sending terminal.
Method according to claim 6, it is characterised in that

The first instruction message is additionally operable to indicate that the gateway generation described second indicates message,

Before the mobility management entity sends the second instruction message to the data sending terminal, in addition to：

The mobility management entity receives the second instruction message that the gateway is sent.
Method according to any one of claim 1 to 8, it is characterised in that also include：

The mobility management entity receives the confirmation message that the data sending terminal is sent, and the confirmation message is used to indicate that the data sending terminal has received described second and indicated message.
A kind of method of data transfer, it is characterised in that including：

Data sending terminal obtains second and indicates message, and the second instruction message is generated after gateway receives the first instruction message, and the first instruction message is used for the downlink data for indicating the inaccessible user equipment of cached in serving gateway downlink data；

The data sending terminal indicates that message sends the downlink data of the user equipment according to described second.
Method according to claim 10, it is characterised in that

Described first indicates that message carries the instruction letter for indicating downlink data described in the cached in serving gateway Breath, the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information,

Wherein,

When the configured information includes the duration, the data sending terminal indicates that message sends the downlink data of the user equipment according to described second, including：

The data sending terminal sends the downlink data of the user equipment according to the described second instruction message determination within the duration,

When the configured information includes the number of data packets, the data sending terminal indicates that message sends the downlink data of the user equipment according to described second, including：

The data sending terminal indicates that message sends the downlink data of the user equipment according to described second, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to the number of data packets,

When the configured information includes the duration and the number of data packets, the data sending terminal indicates that message sends the downlink data of the user equipment according to described second, including：

The data sending terminal determines to send the downlink data of the user equipment within the duration according to the described second instruction message, and the quantity of the packet of the downlink data for the user equipment that the data sending terminal is sent is less than or equal to the number of data packets within the duration.
Method according to claim 11, it is characterised in that

When the configured information includes the duration, or the configured information including the duration and the number of data packets, methods described also includes：

The data sending terminal determines not sending the downlink data of the user equipment in the time in addition to the duration according to the second instruction message.
Method according to any one of claim 10 to 12, it is characterised in that

Before the data sending terminal obtains the second instruction message, in addition to：

The data sending terminal sends the first request message, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, and first request message carries the address information of the data sending terminal and the mark of the user equipment.
Method according to any one of claim 10 to 13, it is characterised in that also include：

The data sending terminal sends confirmation message to the mobility management entity, and the confirmation message is used to indicate that the data sending terminal has received described second and indicated message.
A kind of method of data transfer, it is characterised in that including：

Gateway receives the first instruction message that mobility management entity is sent, and the first instruction message is used for the downlink data for indicating the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and generates the second instruction message；

The gateway obtains the address information of the data sending terminal；

The gateway generates and sends the second instruction message according to the instruction of the described first instruction message and the address information of the data sending terminal, in order to which the data sending terminal indicates that message sends the downlink data of the user equipment according to described second.
Method according to claim 15, it is characterised in that

Described first indicates that message carries the configured information for indicating downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information.
Method according to claim 15 or 16, it is characterised in that described first indicates that message carries the address information of the data sending terminal,

Wherein, the gateway obtains the address information of the data sending terminal, including：

The gateway indicates that message obtains the address information of the data sending terminal according to described first.
Method according to claim 15 or 16, it is characterised in that the first instruction message is additionally operable to indicate the address information that the gateway obtains the data sending terminal,

Wherein, the gateway obtains the address information of the data sending terminal, including：

The gateway indicates that the instruction of message carries out the detection of the downlink data according to described first, obtains the address information of the data sending terminal.
A kind of method of data transfer, it is characterised in that including：

Gateway receives the first instruction message that mobility management entity is sent, the first instruction message is used for the downlink data for indicating the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and obtains the address information of the data sending terminal；

The gateway indicates that the instruction of message carries out the detection of the downlink data according to described first, obtains the address information of the data sending terminal；

The gateway sends the address information of the data sending terminal to the mobility management entity, message is indicated in order to which the mobility management entity generates according to the address information of the data sending terminal and sends second to the data sending terminal, so that the data sending terminal indicates that message sends the downlink data of the user equipment according to described second.
Method according to claim 19, it is characterised in that

Described first indicates that message carries the configured information for indicating downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information.
A kind of mobility management entity, it is characterised in that including：

First determining unit, when the downlink data of the user equipment for being sent in data sending terminal is unreachable, sends first to gateway and indicates message, the first instruction message is used to indicate downlink data described in the cached in serving gateway；

Second determining unit, the second instruction message is sent for determining to need to the data sending terminal；

Transmitting element, message is indicated for sending described second to the data sending terminal, in order to which the data sending terminal indicates that message sends the downlink data of the user equipment according to described second.
Method according to claim 21, it is characterised in that

Described first indicates that message carries the configured information for indicating downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information.
Mobility management entity according to claim 21 or 22, it is characterised in that also include：

Acquiring unit, when the downlink data of user equipment for being sent in the first determining unit in data sending terminal is unreachable, before the first instruction message being sent to gateway, obtain the first request message that the data sending terminal is sent, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, first request message carries the address information of the data sending terminal and the mark of the user equipment

Wherein, second determining unit is if it is determined that the mark for identifying the user equipment with being carried in first request message of the user equipment is identical, it is determined that need to send the second instruction message to the data sending terminal.
Mobility management entity according to any one of claim 21 to 23, it is characterised in that also include：

First generation unit, for before the transmitting element sends the second instruction message to the data sending terminal, generating described second and indicating message.
Mobility management entity according to any one of claim 21 to 23, it is characterised in that the first instruction message is additionally operable to indicate that the gateway generation described second indicates message, and the mobility management entity also includes：

Receiving unit, message is indicated for before the transmitting element sends the second instruction message to the data sending terminal, receiving the gateway is sent described second.
Mobility management entity according to claim 21 or 22, it is characterised in that

If it is determined that there is the mark identical mark with the user equipment in default feedback indicator list in first determining unit, then determine to need to send the second instruction message to the data sending terminal, wherein, the default feedback indicator list includes the mark for needing to feed back the described second user equipment for indicating message.
Mobility management entity according to claim 26, it is characterised in that

The first instruction message is additionally operable to indicate the address information that the gateway sends the data sending terminal to the mobility management entity, and the mobility management entity also includes：

First receiving unit, for before the transmitting element sends the second instruction message to the data sending terminal, receiving the address information for the data sending terminal that the gateway is sent；

Second generation unit, indicates message, described second indicates that message carries the address information of the data sending terminal for before the transmitting element sends the second instruction message to the data sending terminal, generating described second.
Mobility management entity according to claim 26, it is characterised in that the first instruction message is additionally operable to indicate that the gateway generation described second indicates message, and the mobility management entity also includes：

Second receiving unit, message is indicated for before the transmitting element sends the second instruction message to the data sending terminal, receiving the gateway is sent described second.
Mobility management entity according to any one of claim 21 to 28, it is characterised in that also include：

3rd receiving unit, for receiving the confirmation message that the data sending terminal is sent, the confirmation message is used to indicate that the data sending terminal has received described second and indicated message.
A kind of data sending terminal, it is characterised in that including：

Acquiring unit, message is indicated for obtaining second, the second instruction message is generated after gateway receives the first instruction message, and the first instruction message is used for the downlink data for indicating the inaccessible user equipment of cached in serving gateway downlink data；

First transmitting element, for indicating that message sends the downlink data of the user equipment according to described second.
Data sending terminal according to claim 30, it is characterised in that

Described second indicates that message carries the configured information of downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Wherein,

When the configured information includes the duration, first transmitting element determines to send the downlink data of the user equipment within the duration according to the described second instruction message,

When the configured information includes the number of data packets, first transmitting element indicates that message sends the downlink data of the user equipment according to described second, and the quantity of the packet of the downlink data of the user equipment of data sending terminal transmission is less than or equal to the number of data packets

When the configured information includes the duration and the number of data packets, first transmitting element determines to send the downlink data of the user equipment within the duration according to the second instruction message, and the quantity of the packet of the downlink data for the user equipment that the data sending terminal is sent is less than or equal to the number of data packets within the duration.
Data sending terminal according to claim 31, it is characterised in that

When the configured information includes the duration, or the configured information including the duration and the number of data packets, the data sending terminal also includes：

Determining unit, for determining not sending the downlink data of the user equipment in the time in addition to the duration according to the second instruction message.
Data sending terminal according to any one of claim 30 to 32, it is characterised in that also include：

Second transmitting element, for before the acquiring unit obtains the second instruction message, send the first request message, first request message is used to ask network to feed back the second instruction message when the downlink data of the user equipment is unreachable, and first request message carries the address information of the data sending terminal and the mark of the user equipment.
Data sending terminal according to any one of claim 30 to 33, it is characterised in that also include：

3rd transmitting element, for sending confirmation message to the mobility management entity, the confirmation message is used to indicate that the data sending terminal has received described second and indicated message.
A kind of gateway, it is characterised in that including：

Receiving unit, indicates message, the first instruction message indicates message for indicating the downlink data for the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and generating second for receiving the first of mobility management entity transmission；

Acquiring unit, the address information for obtaining the data sending terminal；

Transmitting element, generates and sends the second instruction message, in order to which the data sending terminal indicates that message sends the downlink data of the user equipment according to described second for the instruction according to the described first instruction message and the address information of the data sending terminal.
Gateway according to claim 35, it is characterised in that

Described first indicates that message carries the configured information for indicating downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information.
Gateway according to claim 35 or 36, it is characterised in that described first indicates that message carries the address information of the data sending terminal,

Wherein, the acquiring unit indicates that message obtains the address information of the data sending terminal according to described first.
Gateway according to claim 35 or 36, it is characterised in that the first instruction message is additionally operable to indicate the address information that the gateway obtains the data sending terminal,

Wherein, the acquiring unit indicates that the instruction of message carries out the detection of the downlink data according to described first, obtains the address information of the data sending terminal.
A kind of gateway, it is characterised in that including：

Receiving unit, first for receiving mobility management entity transmission indicates message, the first instruction message is used for the downlink data for indicating the inaccessible user equipment of downlink data that the data cached in serving gateway transmitting terminal is sent, and obtains the address information of the data sending terminal；

Acquiring unit, for indicating that the instruction of message carries out the detection of the downlink data according to described first, obtains the address information of the data sending terminal；

Transmitting element, address information for sending from the data sending terminal to the mobility management entity, message is indicated in order to which the mobility management entity generates according to the address information of the data sending terminal and sends described second to the data sending terminal, so that the data sending terminal indicates that message sends the downlink data of the user equipment according to described second.
Gateway according to claim 39, it is characterised in that

Described first indicates that message carries the configured information for indicating downlink data described in the cached in serving gateway, and the configured information includes duration and/or number of data packets,

Described second indicates that message carries the configured information.