CN106489276A

CN106489276A - A kind of method and apparatus processing downlink data

Info

Publication number: CN106489276A
Application number: CN201580029326.XA
Authority: CN
Inventors: 张万强; 黄正磊; 邓强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-07-02
Filing date: 2015-07-02
Publication date: 2017-03-08
Also published as: WO2017000312A1

Abstract

The embodiment of the present invention provides a kind of method and apparatus processing downlink data, and the method includes：What gateway reception Mobility Management Entity sent indicates message for indicating that target UE can not receive the first of downlink data；Gateway receive this first instruction message indicated by this target UE downlink data when, the downlink data of caching of target UE；Gateway, in the case of determining that this target UE can receive downlink data, sends the downlink data of this target UE of this caching to target UE.In embodiments of the present invention, carry out the downlink data of caching of target UE by gateway, with respect to prior art, the problem of the hydraulic performance decline being led to by the downlink data that wireless access network node caches UE can be prevented effectively from, and the problem of the data-bag lost being likely to occur.

Description

A kind of method and apparatus for handling downlink data

Technical field

The present embodiments relate to the communications field, and more particularly, to a kind of method and apparatus for handling downlink data.

Background technology

In order to support wireless side (such as Long Term Evolution (Long Term Evolution, evolution referred to as " LTE "), 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) universal land radio access web (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 Equipment, data transfer, forwarding and route handoff referred to as " UE ") etc., 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：As the anchor point of packet data network (Packet Data Network, referred to as " PDN ") connection, with being responsible for UE Internet protocol (Internet Protocol, referred to as " IP ") Location 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 monitoring PCH 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 networks 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.

Discontinuous reception (Discontinuous Reception, referred to as " DRX ") is a kind of mode of operation of saving UE 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 Idle state DRX (referred to as " I-DRX ") and connected state DRX (referred to as " C-DRX ") two kinds, wherein, what Idle state DRX referred to as its name suggests is exactly that, 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.

For further optimization UE power consumption, 3GPP is extended in R12 to DRX, it is determined that the discontinuous reception (extended Discontinuous Reception, referred to as " eDRX ") of extension：Relative to DRX, increase the duration of rest period, for example, for Idle state UE, main thought is that extension paging DRX arrive long time value so that UE wake up monitoring paging message interval it is elongated, so as to reach power saving purpose.For connected state UE, main thought is to extend connected state DRX to long time value, and in the DRX cycle, UE closes wireless receiving and sending module, so as to reach power saving purpose.The discontinuous reception (eDRX) of extension includes connected state DRX (the extended Connected-Discontinuous Reception of extension, referred to as " eC-DRX ") and extension Idle state DRX (extended Idle-Discontinuous Reception, referred to as " eI-DRX ").

For the UE of the connected state DRX (eC-DRX) in extension, when the downlink data for having the UE is reached, core network user face node serve gateway S-GW sends the downlink data of the UE into the UE contexts given RAN node (such as eNB).Because the UE employs eC-DRX, downlink data can not be received immediately, eNB has to the downlink data for caching the UE, the downlink data of caching could be sent into the UE when UE can receive downlink data, generally, also the UE states that can receive downlink data can be referred to as into UE reachable.

From the foregoing, it will be observed that in the art, eNB needs to cache the downlink data for the UE for being configured as eC-DRX.If UE quantity is very big, such as sensor machine type communication (Machine Type Communication, referred to as " MTC ") equipment, then eNB need to cache substantial amounts of downlink data；In addition, the MTC device of data interaction is carried out for some seldom and network sides, its eC-DRX cycle can reach the rank of a few minutes, eNB may need to cache a large amount of downlink data packets for a long time, this can influence eNB caching performance, the especially limited small base station of buffer memory capacity, it is also possible to cause eNB not have enough spatial cache caching downlink datas and directly packet discard.

The content of the invention

The embodiment of the present invention provides a kind of method and apparatus for handling downlink data, can be prevented effectively from by wireless access network node (such as eNB) cache UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of.

First aspect includes there is provided a kind of method for handling downlink data, this method：

What gateway reception mobility management entity was sent is used to indicate that target UE UE can not receive the first of downlink data and indicate message；

The gateway caches target UE downlink data in the downlink data for receiving the target UE indicated by the first instruction message；

The gateway sends the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data.

With reference in a first aspect, in the first possible implementation of first aspect, what the gateway received that mobility management entity sends is used to indicate that target UE UE can not receive the first of downlink data and indicate message, including：

The gateway receive the mobility management entity it is determined that the target UE access wireless access network node inadequate buffer space in the case of, transmission this first indicate message.

With reference to the first possible implementation of first aspect or first aspect, in second of possible implementation of first aspect, what gateway reception mobility management entity was sent is used to indicate that target UE UE can not receive the first of downlink data and indicate message, including：

The gateway receives the first instruction message of mobility management entity transmission, and the first instruction message is that the mobility management entity is sent based on what the wireless access network node was sent for indicating message of the target UE in connected state discontinuous reception DRX mode to the gateway.

With reference to first aspect and its above-mentioned implementation, in the third implementation of first aspect, the gateway sends the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data, including：

The gateway receive the mobility management entity transmission be used for indicate target UE can receive downlink data second indicate message, the second instruction message is the mobility management entity indicates that target UE can receive the message of downlink data and to gateway transmission based on being used for of sending of the wireless access network node, or, the second instruction message is to be sent in the case that the mobility management entity receives the hand off signaling that the wireless access network node is sent in the switching flow based on S1 interfaces to the gateway；

The gateway determines that target UE can receive downlink data according to the second instruction message, And the target UE of caching downlink data is sent to target UE.

With reference to the first or second of implementation of first aspect or first aspect, in the 4th kind of implementation of first aspect, the gateway sends the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data, including：

The gateway receive the mobility management entity transmission be used for indicate target UE can receive the temporal information of downlink data the 3rd indicate message；

The gateway indicates message according to the 3rd, at the time of determining that target UE can receive downlink data；

The gateway sends the target UE of caching downlink data to the target UE at the time of target UE can receive downlink data.

With reference to the 4th kind of implementation of first aspect, in the 5th kind of implementation of first aspect, the 3rd instruction message includes target UE discontinuous reception DRX information.

With reference to the first or second of implementation of first aspect or first aspect, in the 6th kind of implementation of first aspect, the first instruction message, which also includes target UE, can receive the temporal information of downlink data；

Wherein, the gateway sends the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data, including：

The gateway can receive the temporal information of downlink data according to target UE, at the time of determining that target UE can receive downlink data；

With reference to the first or the 6th kind of implementation of first aspect, in the 7th kind of implementation of first aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

With reference to the first or second of implementation of first aspect or first aspect, in the 8th kind of implementation of first aspect, the gateway sends the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data, including：

The gateway is in the switching flow based on S1 interfaces, when receiving the establishment indirect data forward tunneled requests of mobility management entity transmission, determine that target UE can receive downlink data, and send to the target UE target UE of caching downlink data.

, should in the 9th kind of implementation of first aspect with reference to first aspect and its above-mentioned implementation Method also includes：

The gateway sends the downlink data notification message that the downlink data for indicating target UE is reached in the downlink data for receiving the target UE indicated by the first instruction message to the mobility management entity.

Second aspect provides a kind of method for handling downlink data, and this method includes：

Mobility management entity determines that target UE UE can not receive downlink data；

The mobility management entity sends to gateway and indicates message for indicating that target UE can not receive the first of downlink data, in order to cached in serving gateway target UE downlink data.

With reference to second aspect, in the first implementation of second aspect, the mobility management entity sends to gateway and indicates message for indicating that target UE can not receive the first of downlink data, including：

In the case where the caching of the target UE wireless access network nodes accessed is not enough, the mobility management entity sends the first instruction message to gateway.

With reference to the first implementation of second aspect, in second of implementation of second aspect, this is in the case where the caching of the target UE wireless access network nodes accessed is not enough, and the mobility management entity sends the first instruction message to gateway, including：

The mobility management entity receives the request message for being used to ask to cache target UE downlink data of wireless access network node transmission, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity；

The mobility management entity sends the first instruction message according to the request message to the gateway.

With reference to the implementation above mode of second aspect, in the third implementation of second aspect, the mobility management entity determines that target UE UE can not receive downlink data, including：

The configured information for indicating discontinuous reception DRX modes of the target UE in connected state that the wireless access network node that the mobility management entity receives target UE accesses is sent；

The mobility management entity determines that target UE can not receive downlink data according to the configured information.

With reference to second aspect and its above-mentioned implementation, in the 4th kind of implementation of second aspect, this method also includes：

The mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, in order to which the gateway can receive downlink data in target UE In the case of the target UE of caching downlink data is sent to target UE.

With reference to the 4th kind of implementation of second aspect, in the 5th kind of implementation of second aspect, target UE is in the discontinuous connection DRX mode of connected state,

Wherein, the mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, including：

The mobility management entity is sent for asking the wireless access network node to notify target UE to stop the first request message of DRX mode to the target UE wireless access network nodes accessed；

The mobility management entity receive the wireless access network node transmission be used for indicate that target UE has stopped the first confirmation message of DRX mode；

The mobility management entity determines that target UE can receive downlink data, and send the second instruction message to the gateway according to first confirmation message.

With reference to the 4th kind of implementation of second aspect, in the 6th kind of implementation of second aspect, the mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, including：

When the mobility management entity is in the switching flow based on S1 interfaces, receives the hand off signaling of wireless access network node transmission, determine that target UE can receive downlink data, and the second instruction message is sent to the gateway.

With reference to the 4th kind of implementation of second aspect, in the 7th kind of implementation of second aspect, the mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, including：

The mobility management entity sends the second request message of the temporal information for asking target UE to receive downlink data to the target UE wireless access network nodes accessed；

The mobility management entity receives the second confirmation message that target UE can receive the temporal information of downlink data that includes of wireless access network node transmission；

The mobility management entity is according to second confirmation message, being sent to the gateway includes the second instruction message for the temporal information that target UE can receive downlink data, at the time of determining that target UE can receive downlink data in order to the gateway, and the downlink data of from the target UE to target UE transmission cachings.

With reference to the 7th kind of implementation of second aspect, in the 8th kind of implementation of second aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

With reference to second aspect or second aspect the first to the possible implementation of any of the third implementation, in the 9th kind of implementation of second aspect, the first instruction message, which also includes target UE, can receive the temporal information of downlink data, in order to which the gateway is in the case where target UE can receive downlink data, downlink data is sent to target UE.

With reference to the 9th kind of implementation of second aspect, in the tenth kind of implementation of second aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

With reference to second aspect and its above-mentioned implementation, in a kind of the tenth implementation of second aspect, this method also includes：

The mobility management entity receives the downlink data notification message for the downlink data arrival for being used to indicate target UE that the gateway is sent when receiving target UE downlink data.

The third aspect provides a kind of method for handling downlink data, and this method includes：

Wireless access network node determines that target UE UE can not receive downlink data；

The wireless access network node is sent to gateway by mobility management entity and indicates message for indicating that target UE can not receive the first of downlink data, in order to cached in serving gateway target UE downlink data；

The wireless access network node is sent to the gateway by the mobility management entity and indicates message for indicating that target UE can receive the second of downlink data, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

With reference to the third aspect, in the first implementation of the third aspect, the wireless access network node sent by mobility management entity to gateway for indicate target UE can not receive downlink data first indicate message after, this method also includes：

The wireless access network node is it is determined that in the case of the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching target UE is sent to the mobility management entity.

With reference to the first implementation of the third aspect or the third aspect, in second of implementation of the third aspect, the wireless access network node determines that target UE UE can not receive downlink data, including：

Target UE is configured to connected state discontinuous reception DRX mode by the wireless access network node.

, should in the third implementation of the third aspect with reference to second of implementation of the third aspect Wireless access network node is sent to the gateway by the mobility management entity and indicates message for indicating that target UE can receive the second of downlink data, including：

The wireless access network node receives the first request message for being used to ask to notify target UE to stop DRX mode of mobile management entity transmission；

The wireless access network node notifies target UE to stop DRX mode, and in the case of it is determined that target UE stops DRX mode, sent to the mobility management entity for indicating that target UE has stopped the second instruction message of DRX mode, in order to which the mobility management entity informs that gateway target UE can receive downlink data.

With reference to second of implementation of the third aspect, in the 4th kind of implementation of the third aspect, the wireless access network node is sent to the gateway by the mobility management entity and indicates message for indicating that target UE can receive the second of downlink data, including：

The wireless access network node receive the mobility management entity transmission for the second request message of the temporal information for asking target UE to receive downlink data；

The wireless access network node is sent to the mobility management entity includes the second instruction message for the temporal information that target UE can receive downlink data, in order to which the mobility management entity sends the temporal information to the gateway, in order to which the gateway sends downlink data in the case where target UE can receive downlink data to target UE.

With reference to the 4th kind of implementation of the third aspect, in the 5th kind of implementation of the third aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

Fourth aspect provides a kind of equipment for handling downlink data, and the equipment includes：

Receiving module, for receive mobility management entity transmission be used for indicate target UE UE can not receive downlink data first indicate message；

Cache module, in the downlink data for receiving the target UE indicated by the first instruction message that the receiving module is received, caching target UE downlink data；

Sending module, in the case of it is determined that target UE can receive downlink data, the target UE of cache module caching downlink data to be sent to target UE.

With reference to fourth aspect, in the first possible implementation of fourth aspect, the receiving module specifically for, receive the mobility management entity it is determined that the target UE access wireless access network node inadequate buffer space in the case of, transmission this first indicate message.

With reference to the first possible implementation of fourth aspect or fourth aspect, the second of fourth aspect Plant in possible implementation, the receiving module specifically for, the first instruction message of mobility management entity transmission is received, the first instruction message is that the mobility management entity is sent based on what the wireless access network node was sent for indicating message of the target UE in connected state discontinuous reception DRX mode to the gateway.

With reference to fourth aspect and its above-mentioned implementation, in the third implementation of fourth aspect, the sending module includes：

First receiving unit, for receive the mobility management entity transmission be used for indicate target UE can receive downlink data second indicate message, the second instruction message is the mobility management entity indicates that target UE can receive the message of downlink data and to gateway transmission based on being used for of sending of the wireless access network node, or, the second instruction message is to be sent in the case that the mobility management entity receives the hand off signaling that the wireless access network node is sent in the switching flow based on S1 interfaces to the gateway；

First transmitting element, second for being received according to first receiving unit indicates message, determines that target UE can receive downlink data, and send to the target UE target UE of caching downlink data.

With reference to the first or second of implementation of fourth aspect or fourth aspect, in the 4th kind of implementation of fourth aspect, the sending module includes：

Second receiving unit, for receive the mobility management entity transmission be used for indicate target UE can receive the temporal information of downlink data the 3rd indicate message；

First determining unit, for being received according to second receiving unit the 3rd indicates message, at the time of determining that target UE can receive downlink data；

Second transmitting element, at the time of the target UE determined for first determining unit can receive downlink data, the target UE of caching downlink data is sent to target UE.

With reference to the 4th kind of implementation of fourth aspect, in the 5th kind of implementation of fourth aspect, the 3rd instruction message includes target UE discontinuous reception DRX information.

With reference to the first or second of implementation of fourth aspect or fourth aspect, in the 6th kind of implementation of fourth aspect, the first instruction message, which also includes target UE, can receive the temporal information of downlink data；

Wherein, the sending module includes：

Second determining unit, for the temporal information of downlink data can be received according to target UE, at the time of determining that target UE can receive downlink data；

3rd transmitting element, at the time of the target UE that second determining unit is determined can receive downlink data, the target UE of caching downlink data to be sent to target UE.

With reference to the first or the 6th kind of implementation of fourth aspect, in the 7th kind of implementation of fourth aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

With reference to the first or second of implementation of fourth aspect or fourth aspect, in the 8th kind of implementation of fourth aspect, the sending module specifically for, in the switching flow based on S1 interfaces, when receiving the establishment indirect data forward tunneled requests of mobility management entity transmission, determine that target UE can receive downlink data, and send to the target UE target UE of caching downlink data.

With reference to fourth aspect and its above-mentioned implementation, in the 9th kind of implementation of fourth aspect, the sending module is additionally operable to, in the downlink data for receiving the target UE indicated by the first instruction message, the downlink data notification message that the downlink data for indicating target UE is reached is sent to the mobility management entity.

5th aspect provides a kind of equipment for handling downlink data, and the equipment includes：

Determining module, for determining that target UE UE can not receive downlink data；

First sending module, for being sent to gateway for indicating that the target UE that the determining module is determined can not receive the first instruction message of downlink data, in order to cached in serving gateway target UE downlink data.

With reference to the 5th aspect, in the first implementation of the 5th aspect, first sending module is specifically in the case where the caching of the target UE wireless access network nodes accessed is not enough, the first instruction message is sent to gateway.

With reference to the first implementation of the 5th aspect, in second of implementation of the 5th aspect, first sending module includes：

First receiving unit, the request message for being used to ask to cache target UE downlink data for receiving wireless access network node transmission, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity；

First transmitting element, for the request message received according to first receiving unit, the first instruction message is sent to the gateway.

With reference to the implementation above mode of the 5th aspect, in the third implementation of the 5th aspect, the determining module includes：

Second receiving unit, for receiving the use that the wireless access network node of target UE accesses is sent In the configured information for indicating discontinuous reception DRX modes of the target UE in connected state；

Determining unit, for the configured information received according to second receiving unit, determines that target UE can not receive downlink data.

With reference to the 5th aspect and its above-mentioned implementation, in the 4th kind of implementation of the 5th aspect, the equipment also includes：

Second sending module, message is indicated for indicating that target UE can receive the second of downlink data for being sent to the gateway, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

With reference to the 4th kind of implementation of the 5th aspect, in the 5th kind of implementation of the 5th aspect, target UE is in the discontinuous connection DRX mode of connected state,

Wherein, second sending module includes：

First transmitting element, for being sent to the target UE wireless access network nodes accessed for asking the wireless access network node to notify target UE to stop the first request message of DRX mode；

First receiving unit, for receive the wireless access network node transmission be used for indicate that target UE has stopped the first confirmation message of DRX mode；

First transmitting element is additionally operable to, according to first confirmation message, determines that target UE can receive downlink data, and send the second instruction message to the gateway.

With reference to the 4th kind of implementation of the 5th aspect, in the 6th kind of implementation of the 5th aspect, second sending module specifically for, when in the switching flow based on S1 interfaces, when receiving the hand off signaling of wireless access network node transmission, determine that target UE can receive downlink data, and the second instruction message is sent to the gateway.

With reference to the 4th kind of implementation of the 5th aspect, in the 7th kind of implementation of the 5th aspect, second sending module includes：

Second transmitting element, the second request message for sending the temporal information for asking target UE to receive downlink data to the target UE wireless access network nodes accessed；

Second receiving unit, the second confirmation message that target UE can receive the temporal information of downlink data that includes for receiving wireless access network node transmission；

Second transmitting element is additionally operable to, according to second confirmation message, being sent to the gateway includes the second instruction message for the temporal information that target UE can receive downlink data, at the time of determining that target UE can receive downlink data in order to the gateway, and the downlink data of from the target UE to target UE transmission cachings.

With reference to the 7th kind of implementation of the 5th aspect, in the 8th kind of implementation of the 5th aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

With reference to the 5th aspect or the 5th aspect the first to the third implementation, in the 9th kind of implementation of the 5th aspect, the first instruction message, which also includes target UE, can receive the temporal information of downlink data, in order to which the gateway is in the case where target UE can receive downlink data, downlink data is sent to target UE.

With reference to the 9th kind of implementation of the 5th aspect, in the tenth kind of implementation of the 5th aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

With reference to the 5th aspect and its above-mentioned implementation, in a kind of the tenth implementation of the 5th aspect, the equipment also includes：

Receiving module, the downlink data notification message for receiving the downlink data arrival for being used to indicate target UE that the gateway is sent when receiving target UE downlink data.

6th aspect provides a kind of equipment for handling downlink data, and the equipment includes：

First sending module, indicates message, in order to cached in serving gateway target UE downlink data for being sent by mobility management entity to gateway for indicating that target UE can not receive the first of downlink data；

Second sending module, message is indicated for indicating that target UE can receive the second of downlink data for being sent by the mobility management entity to the gateway, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

With reference to the 6th aspect, in the first implementation of the 6th aspect, the equipment also includes：

3rd sending module, for it is determined that in the case of the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching target UE is sent to the mobility management entity.

With reference to the 6th aspect or the first implementation of the 6th aspect, in second of implementation of the 6th aspect, the determining module by target UE specifically for being configured to connected state discontinuous reception DRX mode.

, should in the third implementation of the 6th aspect with reference to second of implementation of the 6th aspect Second sending module includes：

First receiving unit, the first request message for being used to ask to notify target UE to stop DRX mode for receiving mobile management entity transmission；

First transmitting element, for notifying target UE to stop DRX mode, and in the case of it is determined that target UE stops DRX mode, sent to the mobility management entity for indicating that target UE has stopped the second instruction message of DRX mode, in order to which the mobility management entity informs that gateway target UE can receive downlink data.

With reference to second of implementation of the 6th aspect, in the 4th kind of implementation of the 6th aspect, the sending module of nothing second includes：

Second receiving unit, for receive the mobility management entity transmission for the second request message of the temporal information for asking target UE to receive downlink data；

Second transmitting element, include the second instruction message for the temporal information that target UE can receive downlink data for being sent to the mobility management entity, in order to which the mobility management entity sends the temporal information to the gateway, in order to which the gateway is in the case where target UE can receive downlink data, downlink data is sent to target UE.

With reference to the 4th kind of implementation of the 6th aspect, in the 5th kind of implementation of the 6th aspect, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

Based on above-mentioned technical proposal, in embodiments of the present invention, when the arrival of the target UE downlink data of downlink data can not be received, target UE downlink data is cached by core net node gateway, relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

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 embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 shows the indicative flowchart of the method for the processing downlink data provided according to embodiments of the present invention.

Fig. 2 shows another indicative flowchart of the method for the processing downlink data provided according to embodiments of the present invention.

Fig. 3 show the present embodiments relate to the switching flow based on S1 interfaces indicative flowchart.

Fig. 4 shows another indicative flowchart of the method for the processing downlink data provided according to embodiments of the present invention.

Fig. 5 shows another indicative flowchart of the method for the processing downlink data provided according to embodiments of the present invention.

Fig. 6 shows another indicative flowchart of the method for the processing downlink data provided according to embodiments of the present invention.

Fig. 7 shows the indicative flowchart of the method for the processing downlink data provided according to another embodiment of the present invention.

Fig. 8 shows the indicative flowchart of the method for the processing downlink data provided according to yet another embodiment of the invention.

Fig. 9 shows the schematic block diagram of the equipment of the processing downlink data provided according to embodiments of the present invention.

Figure 10 shows the schematic block diagram of the equipment of the processing downlink data provided according to another embodiment of the present invention.

Figure 11 shows the schematic block diagram of the equipment of the processing downlink data provided according to yet another embodiment of the invention.

Figure 12 shows the schematic block diagram of the gateway provided according to embodiments of the present invention.

Figure 13 shows the schematic block diagram of the mobility management entity provided according to embodiments of the present invention.

Figure 14 shows the schematic block diagram of the wireless access network node provided according to embodiments 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 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 under the premise of creative work is not made belongs 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：The whole world is moved Dynamic communication (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.

The network element device that the embodiment of the present invention is related generally to is introduced first：

1) mobile management entity (such as MME)：The function related to the downlink data for handling the UE in connected state DRX is supported, including UE accessibilities (whether can receive downlink data) information is provided to S-GW, DRX relevant information etc. is asked to RAN side gussets.

2) gateway (such as S-GW)：The function related to the downlink data for handling the UE in connected state DRX is supported, including UE accessibility is marked according to MME instructions, and the caching of downlink data packet and transmission etc..

3) wireless access network node (such as RAN)：Support to be in connected state DRX's with processing The related function of UE downlink data, including indicate that UE leaves connected state DRX by signaling, provide caching service condition and connected state DRX information etc. to MME.

Fig. 1 shows the method 100 of the processing downlink data of the embodiment of the present invention, and this method 100 is for example performed by gateway, as shown in figure 1, this method 100 includes：

S110, what gateway reception mobility management entity was sent is used to indicate that target UE UE can not receive the first of downlink data and indicate message；

S120, the gateway caches target UE downlink data when receiving target UE downlink data；

S130, the gateway sends the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data.

In embodiments of the present invention, when the arrival of the target UE downlink data of downlink data can not be received, target UE downlink data is cached by core net node gateway, it should be understood that gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, even if for example, target UE rest period reaches a minute rank, the problem of also will not there is inadequate buffer space easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Specifically, for example, the mobile management entity being related in the embodiment of the present invention is MME, gateway is S-GW, and wireless access network node is RAN node.

It should be understood that in embodiments of the present invention, target UE can one or more can not receive the UE of downlink data.Specifically, such as target UE is one or more UE for being configured as discontinuous reception DRX mode being under connected state.

Alternatively, in embodiments of the present invention, what S110 gateways reception mobility management entity was sent is used to indicate that target UE UE can not receive the first of downlink data and indicate message, including：

The gateway receive mobility management entity transmission this first indicate message, the first instruction message is the mobility management entity indicates that target UE is in the message of connected state discontinuous reception DRX mode and to gateway transmission based on being used for of sending of the wireless access network node that the target UE access.

Specifically, target UE is configured as connected state discontinuous reception (Connected-Discontinuous Reception, referred to as " C-DRX "), is exactly the noncontinuity reception that target UE is under connected state (DRX), i.e. target UE only opens receiver into the activation phase in special time period, and to receive downlink data and signaling, and section closing receiver enters rest period at other times, stops receiving downlink data and signaling.

Specifically, in S110, the first instruction message includes that the target UE of downlink data mark can not be received.Gateway saves these target UE that can not receive downlink data mark.

In embodiments of the present invention, for the target UE in connected state DRX (C-DRX) downlink data reach when, utilize core net node, that is gateway S-GW caches target UE downlink data, it should be understood that, S-GW is relative to Radio Access Network RAN node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, therefore the embodiment of the present invention is relative to prior art, the problem of hydraulic performance decline caused by RAN node caching UE downlink data can be prevented effectively from, and be likely to occur data-bag lost the problem of.

It should be understood that, the connected state noncontinuity that target UE in the embodiment of the present invention can also be arranged to extension receives (extended Connected-Discontinuous Reception, UE referred to as " eC-DRX "), contrast of the embodiment of the present invention is not restricted, as long as target UE is in DRX mode of operations under connected state.

Therefore, the scene when user equipment that the method for the processing downlink data provided according to embodiments of the present invention can apply to be configured to connected state discontinuous reception (C-DRX) has downlink data arrival, can also be applied to be configured to the scene when user equipment of the connected state discontinuous reception (eC-DRX) of extension have downlink data arrival.

It should also be understood that the target UE being related in the embodiment of the present invention can be but be not limited to the UE in connected state discontinuous reception RDX patterns, alternatively, can also be in other connected states can not expression patterns UE, the embodiment of the present invention is not construed as limiting to this.

In S120, specifically, when the downlink data for having UE is reached, gateway judges whether the UE is that can not receive the target UE of downlink data by the mark of the UE, if it is, caching target UE downlink data.

Further, gateway can be when receiving target UE downlink data, downlink data notification message is sent to mobility management entity, assigned with the downlink data for informing mobility management entity target UE, it is easy to mobility management entity to make further action, the relevant information of downlink data can be received by such as obtaining target UE, and indicating service gateway issue it is data cached etc..

Alternatively, in embodiments of the present invention, this method 100 also includes：

S140, the gateway sends the downlink data notification message that the downlink data for indicating target UE is reached in the downlink data for receiving the target UE indicated by the first instruction message to the mobility management entity.

It should be understood that in embodiments of the present invention, gateway, when receiving target UE downlink data, can begin to cache target UE downlink data；Caching can also be started after the downlink data notification confirmation message of mobility management entity transmission is received, the embodiment of the present invention is not construed as limiting to this.

Alternatively, in embodiments of the present invention, the S120 gateways cache target UE downlink data when receiving target UE downlink data, including：

S121, the gateway sends the downlink data notification message that the downlink data for indicating target UE is reached in the downlink data for receiving the target UE indicated by the first instruction message to the mobility management entity；

S122, the gateway receives the downlink data notification confirmation message of mobility management entity transmission, and caches target UE downlink data.

Specifically, so that RAN node is eNB as an example, Fig. 2 shows another indicative flowchart of the method for the processing downlink data provided according to embodiments of the present invention.

When UE is configured to connected state DRX (i.e. C-DRX) pattern by S201, eNB, eNB is provided for indicate that the UE is configured as the configured information of C-DRX patterns to MME, and MME preserves the configured information.

S202, after eNB spatial caches, which take, reaches certain threshold value, eNB sends S1-AP message to MME, and the S1-AP message is used for the downlink data for the UE for asking core net node caching to be configured as C-DRX.

S203, MME are received after the S1-AP message of eNB request caching UE downlink data, and sending UE accessibilities to S-GW indicates message, and the UE accessibilities indicate that message includes the mark for being configured as C-DRX UE.

S204, S-GW will be configured to C-DRX UE (s) labeled as " interim unreachable ".

S205, S-GW receives UE downlink datas, in the case of it is determined that the corresponding UE of the UE downlink datas is marked as " interim unreachable ", then S-GW sends downlink data notification (Dowlink Data Notification to MME, the mark of the UE is carried in referred to as " DDN ") message, the DDN message.

It should be understood that S-GW receives UE downlink data from P-GW.

S206, MME send downlink data notification to S-GW and confirm (Dowlink Data Notification Acknowledgement, referred to as " DDNA ") message, for informing that S-GW needs to cache the downlink data of the UE.

It should be understood that the UE accessibilities being mentioned in embodiments of the present invention indicate that message is referred to for indicating that can UE receive the instruction message of downlink data.It should be understood that UE is up to referring to that the UE can receive downlink data and signaling, UE is unreachable to refer to that the UE can not receive downlink data and signaling.

In embodiments of the present invention, when the downlink data of target UE for that can not receive downlink data is reached, when downlink data for example for the target UE in connected state DRX (C-DRX) is reached, when the inadequate buffer space of the corresponding RAN nodes of target UE, target UE downlink data is cached by S-GW.In other words, in embodiments of the present invention, in the case where target UE RAN node spatial cache is sufficient, target UE downlink data is cached according to traditional scheme.In the case of the inadequate buffer space of RAN node, by core net node gateway is come caching of target UE downlink data, the method of the processing downlink data provided according to embodiments of the present invention, can compatible prior art, so as to more neatly caching of target UE downlink data.

Therefore, the method for the processing downlink data provided according to embodiments of the present invention, on the one hand, one is added on the basis of RAN node is used for the caching of target UE storage location of downlink data, the burden that the system that can effectively reduce integrally caches UE downlink data；On the other hand, gateway is relative to wireless access network node (the especially limited small base station of spatial cache), and spatial cache is larger, data buffer storage performance is also preferable, even if for example, target UE rest period reaches a minute rank, the problem of also will not there is inadequate buffer space easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Specifically, the gateway can be the first instruction message that mobility management entity transmission is received in the case of the inadequate buffer space of the target UE wireless access network nodes accessed.

Alternatively, in embodiments of the present invention, what S120 gateways reception mobility management entity was sent is used to indicate that target UE UE can not receive the first of downlink data and indicate message, including：

The gateway receives the first instruction message that the mobility management entity is sent in the case where receiving the request message for being used for the downlink data that request caches target UE for the wireless access network node transmission that target UE is accessed, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity.

Specifically, for example during the inadequate buffer space of the RAN node of target UE accesses, the RAN Node sends the request message of the downlink data for asking caching of target UE to MME, and MME sends to S-GW according to the request message and indicates message for indicating that target UE can not receive the first of downlink data (also referred to as unreachable).

It should be understood that the inadequate buffer space of RAN node refers to the predetermined threshold value that occupies over of the spatial cache of the RAN node, such as when the caching performance that can cause the RAN node when occupying over the predetermined threshold value of the spatial cache of RAN node declines.

It should be understood that, during the request message for being used for request caching downlink data that the mobility management entity can be sent in the RAN node for receiving target UE the first instruction message is sent to gateway, the first instruction message directly is sent to gateway in the case of can also can not receiving downlink data confirming target UE, the embodiment of the present invention is not construed as limiting to this.

In S130, the gateway sends the target UE cached in above-mentioned S120 downlink data to target UE in the case of it is determined that target UE can receive downlink data.Specifically, the instruction message that S-GW can be sent by MME determines that target UE can receive downlink data, so as to send the target UE of caching downlink data to target UE；Can also be according to target UE RDX At the time of information is to determine that target UE can receive downlink data, and the target UE cached at the moment to target UE transmissions downlink data.In addition, when in the handoff procedures based on S1 interfaces of the target UE in source base station and target BS (it should be understood that, target UE can necessarily receive downlink data in handoff procedure), S-GW can also send the target UE of caching downlink data to target UE.

Alternatively, in embodiments of the present invention, the S130 gateways send the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data, including：

S131, the gateway receive the mobility management entity transmission be used for indicate target UE can receive downlink data second indicate message；

Specifically, the second instruction message is the mobility management entity indicates that target UE can receive the message of downlink data and to gateway transmission based on being used for of sending of the wireless access network node, or, the second instruction message is to be sent in the case that the mobility management entity receives the hand off signaling that the wireless access network node is sent in the switching flow based on S1 interfaces to the gateway.

S132, the gateway second indicates message according to this, determines that target UE can receive downlink data, and send to the target UE target UE of caching downlink data.

Specifically, the second instruction message indicates current time target UE can to receive downlink data, i.e. UE reachable.The second instruction message is also referred to as UE accessibilities and indicates message.

Specifically, as shown in Fig. 2 also by RAN node be eNB exemplified by,

S205, S-GW receive UE downlink datas, it is determined that the corresponding UE quilts of the UE downlink datas In the case of labeled as " interim unreachable ", then S-GW sends the mark that the UE is carried in downlink data notification (Dowlink Data Notification, referred to as " DDN ") message, the DDN message to MME.

It should be understood that S-GW receives UE downlink data from P-GW.

S207, S-GW cache the downlink data of the UE.

S208, MME notify UE to stop DRX mode receiving downlink data by S1-AP message requests eNB.

S209, eNB stop DRX mode by scheduling request UE.

S210, after UE, which stops DRX mode, is changed into reachable, eNB sends S1-AP message and informs that the MME UE have stopped DRX mode and have been changed into reachable.

S211, MME are sent for indicating that the UE is reachable UE accessibilities instruction message to S-GW, and the wherein UE accessibilities indicate that message package contains the mark of the UE.

It should be understood that the second instruction message in the embodiment of the present invention, which corresponds to being used in S211, indicates that the UE indicates message for reachable UE accessibilities.

The UE that S212, S-GW identify the UE, that is, the UE (s) for stopping DRX mode being labeled as " reachable ".

S231, S-GW send the downlink data of caching to the UE.It should be understood that as shown in Fig. 2 S-GW sends the downlink data of caching to the eNB of the UE, the downlink data of the caching is then forwarded from the eNB to the UE, associative operation is prior art, is repeated no more here..

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibility configured informations to S-GW, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, MME requests eNB informs that UE stops eC-DRX receiving downlink data.After UE, which stops eC-DRX, is converted to reachable, MME indicates that UE is reachable to S-GW, and the packet of caching is sent to UE by S-GW, it is achieved thereby that it is reachable in UE, i.e., in the case of can receiving downlink data, the UE cached in S-GW downlink data is handed down in time The UE, it is possible to increase the efficiency of transmission of UE downlink datas, also releases the occupancy of the downlink data of the UE to S-GW spatial cache in time.

In the embodiment above in association with Fig. 2, in the case of MME notifies that S-GW caches UE downlink data, MME is by asking RAN side gussets to allow UE stopping eC-DRX receiving downlink data, knowing UE stoppings eC-DRX, in the case of can downlink data being received, MME is sent for indicating that the UE can receive the instruction message of downlink data to S-GW, so that, the S-GW sends the downlink data of corresponding caching according to MME instruction message to the UE.Alternatively, in embodiments of the present invention, MME can also determine that target UE can receive downlink data using other means, for example, when UE is moved to target eNB from source eNB, such as in the switching flow based on S1 interfaces, after MME receives the hand off signaling of source eNB transmissions, also it can determine that target UE is reachable, i.e., can receive downlink data.

It following is a brief introduction of the switching flow based on S1 interfaces.

Whether the switching inside the Universal Terrestrial wireless access network E-UTRAN of evolution changes according to MME can be divided into two kinds, and one of which is switched between source eNB and target eNB under same MME controls, and another is to be related to the switching that MME changes.According to the difference of switching interface, switching inside E-UTRAN can also be divided into two kinds, a kind of is the switching based on X2 interface, another is the switching based on S1 interfaces, wherein, in the switching based on X2 interface, the set-up procedure of its switchable resource is carried out by the X2 interface between source eNB and target eNB, in the switching based on S1 interfaces, the set-up procedure of its switchable resource is carried out by the S1 interfaces between eNB and MME.

When MME is constant, the switching based on X2 interface is both can perform, the switching based on S1 interfaces is also can perform.When MME changes, the switching based on S1 interfaces can only be performed.When S-GW changes, if there is no Internet protocol (Internet Protocol, referred to as " IP ") connective between source S-GW and target eNB, then the switching based on S1 interfaces can only be performed.

Switching flow based on S1 interfaces is illustrated in fig. 3 shown below:

S301：Source eNB determines to initiate a switching based on S1 interfaces.

S302：Source eNB is sent to source MME contains direct forwarded leg validity, source to purpose transparent transmission unit, Target eNB identity, target TAI marks, target TAI and S1AP cause value in handover request message, message.

S303：Source MME determines to need to reselect the MME serviced for UE, and sends preceding to re-positioning request to target MME.

S304：Target MME determines the need for reselecting the S-GW serviced for UE.If needed Reselect, then target MME sends to target S-GW and creates conversation request message (including P-GW low values and TEID).Target S-GW is returned to MME and is created conversational response, including for the S-GW addresses of user plane and TEID.

S305：Target MME is sent in handover request message, message comprising the EPS to be set up carryings, AMBR, S1AP reason, source to target clear transmission unit and switching limitation list to target eNB.Target eNB sends switching request acknowledgement message to target MME.

S306：If relocated using indirect forward and S-GW, target MME sets up forwarding parameter, is sent to target S-GW and creates indirect data forward TUNNEL request message, wherein containing reason and the target eNB addresses of forward and TEID.

S307：If MME is relocated, target MME sends preceding to relocation response message to source MME.If having used indirect tunnel, this message also includes S-GW addresses and the TEID for indirect forward.

S308：If applying indirect forward, source MME sends to source S-GW and creates indirect data forward tunneled requests, includes the address used in reason and forward and TEID.Source S-GW sends to source MME and creates indirect data forward tunnel response message, includes the S-GW addresses used in forward and TEID.

S309：Source MME sends switching command message to source eNB, contains target to source transparent transmission unit, the carrying wanted the carrying of forward and discharged.

S310：Source eNB sends eNB state transfer message by MME to target eNB.

S311：Source eNB can start to carry out forward to the downlink data for needing those carryings of forward.Data forwarding can be realized by way of direct (S311a) or indirectly (S311b).

S312：UE successful synchronizations send switching authentic information to after Target cell to target eNB.Now, it be can be transmitted from the downlink data of source eNB forwards to UE, UE upstream data can also send, be sent through S-GW to P-GW.

Follow-up process is mainly the flows such as the modification and resource release of carrying, is no longer described in detail herein.

It should be understood that only doing simple description to the switching flow based on S1 interfaces above in association with Fig. 3, detailed process refer to the 5.5.1.2.2 of 3GPP TS 23.401 section contents.

Alternatively, in embodiments of the present invention, when the hand off signaling that the source Radio Access Network RAN node in the switching flows based on S1 interfaces of the MME in target UE, receiving target UE is sent, determine that target UE can receive downlink data, and the second instruction message is sent to the S-GW.

Specifically, so that RAN node is eNB as an example, Fig. 4 shows another schematic block diagram of the method for the processing downlink data provided according to embodiments of the present invention.

When UE is configured to connected state DRX (i.e. C-DRX) pattern by S401, source eNB, source eNB is provided for indicate that the UE is configured as the configured information of C-DRX patterns to source MME, and source MME preserves the configured information.

S402, after source eNB spatial caches, which take, reaches certain threshold value, source eNB sends S1-AP message to source MME, and the S1-AP message is used for the downlink data for the UE for asking core net node caching to be configured as C-DRX.

S403, source MME are received after the S1-AP message of source eNB request caching UE downlink data, and sending UE accessibilities to source S-GW indicates message, and the UE accessibilities indicate that message includes the mark for being configured as C-DRX UE.

S404, source S-GW will be configured to C-DRX UE (s) labeled as " interim unreachable ".

S405, source S-GW receives UE downlink datas, in the case of it is determined that the corresponding UE of the UE downlink datas is marked as " interim unreachable ", then source S-GW sends downlink data notification (Dowlink Data Notification to source MME, the mark of the UE is carried in referred to as " DDN ") message, the DDN message.

It should be understood that S-GW receives UE downlink data from P-GW.

S406, source MME send downlink data notification to source S-GW and confirm (Dowlink Data Notification Acknowledgement, referred to as " DDNA ") message, for informing that source S-GW needs to cache the downlink data of the UE.

S407, source S-GW caches the downlink data of the UE；

S408, source eNB have found that UE has been moved to target eNB, determine to initiate a switching based on S1 interfaces.

S409, UE and network carry out the switching flow based on S1 interfaces.

Specifically, flow as shown in Figure 3, or step 2 in the 5.5.1.2.2 of 3GPP TS 23.401 sections is referred to step 10.

S410, after source MME (MME corresponded in the embodiment of the present invention) receives the eNB state transfer message of source eNB transmissions in the switching flow step 10 as shown in Figure 3 based on S1 interfaces, determines that the UE is reachable, i.e., can receive downlink data.

Specifically, corresponding in step S310, source eNB sends eNB state transfer message by MME to target eNB, and the state transfer message, which shows that UE possesses, to be received down shown in Fig. 3 The ability of row data.

S411, source MME send UE accessibilities to source S-GW and indicate message, indicate that the UE is reachable, and UE accessibilities indicate that message also includes the mark of the UE.

It should be understood that the second instruction message in the embodiment of the present invention, which can correspond to being used in S411, indicates that the UE indicates message for reachable UE accessibilities.

S412, source S-GW are received after source MME instruction message, and UE is labeled as into " reachable ".

The downlink data of caching is issued to the UE by S413, source S-GW.

Specifically, source S-GW sends the downlink data of caching to the source eNB that the UE is serviced before the switching flow as shown in Figure 3 based on S1 interfaces, the target eNB that the UE is serviced after switching flow terminates is forwarded directly to by X2 interface by source eNB, then target eNB issues the downlink data of caching to the UE.

It should be understood that, in embodiments of the present invention, after source MME have sent DDN ACK messages to source S-GW in S406, S1-AP message can also be sent to source eNB, request provides the DRX information of the UE, or request source eNB informs that the UE stops DRX mode receiving downlink data (S406a as shown in Figure 4).

It should be understood that the mobility management entity that the source MME in Fig. 4 example showns corresponds in the embodiment of the present invention, the gateway that source S-GW corresponds in the embodiment of the present invention.

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibility configured informations to S-GW, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, MME receive after hand off signaling to S-GW send UE accessibility configured informations inform that UE is reachable, so that the downlink data packet of caching is issued the UE by S-GW, it is achieved thereby that reachable in UE, in the case of can downlink data being received, the UE cached in S-GW downlink data is handed down to the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

S133, the gateway works as reception in the target UE switching flow based on S1 interfaces During the establishment indirect data forward tunneled requests sent to the mobility management entity, determine that target UE can receive downlink data, and send to the target UE target UE of caching downlink data.

Specifically, as shown in Figure 3, when gateway (corresponding to the source S-GW in Fig. 3) receives the establishment indirect data forward tunneled requests of mobility management entity (the source MME corresponded in Fig. 3) transmission (such as the S308 shown in Fig. 3), it is determined that occurring the target UE switching flow based on S1 interfaces, and determine that target UE can receive downlink data, and then the target UE of caching downlink data can be sent to target UE.

It should be understood that, source MME (corresponding to the MME in the embodiment of the present invention) sends establishment indirect data forward tunnel to source S-GW (S-GW corresponded in the embodiment of the present invention) please, the ability that UE has been provided with receiving downlink data is indicated that, i.e. UE is reachable.

Specifically, so that RAN node is eNB as an example, Fig. 5 shows another schematic block diagram of the method for the processing downlink data provided according to embodiments of the present invention.

When UE is configured to connected state DRX (i.e. C-DRX) pattern by S501, source eNB, source eNB is provided for indicate that the UE is configured as the configured information of C-DRX patterns to source MME, and source MME preserves the configured information.

S502, after source eNB spatial caches, which take, reaches certain threshold value, source eNB sends S1-AP message to source MME, and the S1-AP message is used for the downlink data for the UE for asking core net node caching to be configured as C-DRX.

S503, source MME are received after the S1-AP message of source eNB request caching UE downlink data, and sending UE accessibilities to source S-GW indicates message, and the UE accessibilities indicate that message includes the mark for being configured as C-DRX UE.

S504, source S-GW will be configured to C-DRX UE (s) labeled as " interim unreachable ".

S505, source S-GW receives UE downlink datas, in the case of it is determined that the corresponding UE of the UE downlink datas is marked as " interim unreachable ", then source S-GW sends downlink data notification (Dowlink Data Notification to source MME, the mark of the UE is carried in referred to as " DDN ") message, the DDN message.

It should be understood that S-GW receives UE downlink data from P-GW.

S506, source MME send downlink data notification to source S-GW and confirm (Dowlink Data Notification Acknowledgement, referred to as " DDNA ") message, for informing that source S-GW needs to cache the downlink data of the UE.

S507, source S-GW caches the downlink data of the UE；

S508, source eNB have found that UE has been moved to target eNB, determine to initiate a switching based on S1 interfaces.

S509, UE and network carry out the switching flow based on S1 interfaces.

S510, source S-GW receive the establishment indirect data forward tunneled requests of source MME transmissions in the switching flow step 8 as shown in Figure 3 based on S1 interfaces, then UE is labeled as reachable by source S-GW.

The downlink data that S511, source S-GW pass through the indirect forwarding caches of target S-GW.

Specifically, source S-GW sends the downlink data of caching to target S-GW, and the downlink data of the caching is subsequently issued from target S-GW to target eNB, the downlink data of the caching is issued to UE by target eNB, it should be understood that after the completion of the switching based on S1 interfaces, the UE Current Serving BTSs are target eNB.

It should be understood that, in embodiments of the present invention, after source MME have sent DDN ACK messages to source S-GW in S506, S1-AP message can also be sent to source eNB, request provides the DRX information of the UE, or request source eNB informs that the UE stops DRX mode receiving downlink data (S506a as shown in Figure 5).

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibility configured informations to S-GW, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, S-GW learns that UE is reachable according to the signaling message received in the switching flow based on S1 interfaces, the packet of caching is sent to by UE by indirect mode.It is achieved thereby that reachable in UE, in the case of can downlink data being received, the UE cached in S-GW downlink data is handed down to the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

Described above is the instruction message that S-GW is sent according to MME, determine that target UE can receive downlink data, so as to send downlink data to target UE.In embodiments of the present invention, S-GW can also be according to target UE DRX information, at the time of determining that target UE can receive downlink data, so as to issue the downlink data of caching to target UE.

S134, the gateway receive the mobility management entity transmission be used for indicate target UE can receive the temporal information of downlink data the 3rd indicate message；

It should be understood that what the temporal information that target UE can receive downlink data specifically indicated is that can indicate at the time of target UE can receive downlink data or the period, or at the time of also having target UE to receive downlink data or the period.In other words, by the temporal information, which can know target UE is that can to receive downlink data, i.e. UE reachable at, which can not receive downlink data, i.e. UE at unreachable.

S135, the gateway indicates message according to the 3rd, at the time of determining that target UE can receive downlink data；

S136, the gateway sends the target UE of caching downlink data to the target UE at the time of target UE can receive downlink data.

Specifically, at the time of the target UE apart from current time recently can receive downlink data, the target UE of caching downlink data is sent to target UE.

Specifically, for example when target UE is configured as discontinuous reception DRX mode, the temporal information that then target UE can receive downlink data can be specifically target UE DRX information, including but not limited to DRX cycle information and absolute clock reference information, it should be understood that, DRX cycle includes activation phase and rest period, and target UE can receive downlink data in the activation phase.

Alternatively, in embodiments of the present invention, the 3rd instruction message includes target UE DRX information.

Specifically, such as DRX information includes DRX cycle, and the DRX cycle includes activation phase and rest period, and target UE can receive downlink data in the activation phase.

Specifically, in S135, for example by apart from the activation of current time nearest target UE DRX cycle it is interim at the time of be defined as target UE and can receive downlink data at the time of.

Ask to obtain to the wireless access network node it should be understood that target UE DRX information is the mobility management entity.

Specifically, so that RAN node is eNB as an example, Fig. 6 shows another schematic block diagram of the method for the processing downlink data provided according to embodiments of the present invention.

When UE is configured to connected state DRX (i.e. C-DRX) pattern by S601, eNB, eNB to MME is provided for indicate that the UE is configured as the configured information of C-DRX patterns, and MME preserves the configured information.

S602, after eNB spatial caches, which take, reaches certain threshold value, eNB sends S1-AP message to MME, and the S1-AP message is used for the downlink data for the UE for asking core net node caching to be configured as C-DRX.

S603, MME are received after the S1-AP message of eNB request caching UE downlink data, and sending UE accessibilities to S-GW indicates message, and the UE accessibilities indicate that message includes the mark for being configured as C-DRX UE.

S604, S-GW will be configured to C-DRX UE (s) labeled as " interim unreachable ".

S605, S-GW receives UE downlink datas, in the case of it is determined that the corresponding UE of the UE downlink datas is marked as " interim unreachable ", then S-GW sends downlink data notification (Dowlink Data Notification to MME, the mark of the UE is carried in referred to as " DDN ") message, the DDN message.

It should be understood that S-GW receives UE downlink data from P-GW.

S606, MME send downlink data notification to S-GW and confirm (Dowlink Data Notification Acknowledgement, referred to as " DDNA ") message, for informing that S-GW needs to cache the downlink data of the UE.

S607, S-GW cache the downlink data of the UE.

S608, MME send S1-AP message to eNB, and request provides the DRX information of the UE.

S609, eNB send S1-AP ACK messages to MME, and the S1-AP ACK messages include the DRX information of the UE, including absolute clock is referred to and the information such as DRX cycle.

S610, MME send UE accessibilities to S-GW and indicate message, wherein the DRX information comprising UE.

S611, S-GW according to UE DRX information obtain UE be changed into up at the time of, be, for example, the UE DRX cycle in activator a moment, and start a timer T.After when the timer times out, the UE is labeled as " reachable " by S-GW.

S612, S-GW send the downlink data of caching to the eNB for servicing the UE, and specifically, S-GW sends the downlink data of caching to UE eNB, then forwards the downlink data from the eNB to UE.

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibility configured informations to S-GW, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core Heart net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, and RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, MME requests eNB provides the eC-DRX information of the UE, and the eC-DRX information of the UE is sent to S-GW, the reachable time is converted to so that S-GW obtains UE according to the eC-DRX information of the UE, UE up to when the downlink data of caching is sent to the UE.It is achieved thereby that reachable in UE, in the case of can downlink data being received, the UE cached in S-GW downlink data is handed down to the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

Therefore, in embodiments of the present invention, for the target UE in connected state DRX (C-DRX) downlink data reach when, utilize core net node, that is gateway S-GW caches target UE downlink data, it should be understood that, S-GW is relative to Radio Access Network RAN node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, therefore the embodiment of the present invention is relative to prior art, the problem of hydraulic performance decline caused by RAN node caching UE downlink data can be prevented effectively from, and be likely to occur data-bag lost the problem of.

Alternatively, in embodiments of the present invention, the first instruction message, which also includes target UE, can receive the temporal information of downlink data；

Wherein, the S130 gateways send the target UE of caching downlink data to target UE in the case of it is determined that target UE can receive downlink data, including：

S137, the gateway can receive the temporal information of downlink data according to target UE, at the time of determining that target UE can receive downlink data；

It should be understood that what the temporal information that target UE can receive downlink data specifically indicated is that can indicate at the time of target UE can receive downlink data or the period, or at the time of also having target UE to receive downlink data or the period.

S138, the gateway sends the target UE of caching downlink data to the target UE at the time of target UE can receive downlink data.

It should be understood that, gateway is in the first configured information that mobility management entity is sent, downlink data can not be received by obtaining target UE simultaneously, and target UE can receive the temporal information of downlink data, know that target UE can receive downlink data (also referred to as reachable) in which according to the first instruction message period, which period can not receive downlink data (also referred to as unreachable) in.So as to which when target UE downlink data is reached, its downlink data is cached when target UE is unreachable, when target UE can reach greatly, the downlink data is sent to target UE.

Specifically, for example when target UE is configured as discontinuous reception DRX mode, then the temporal information that target UE can receive downlink data can be specifically target UE DRX information, including but not limited to DRX cycle information and absolute clock reference information.

Alternatively, in embodiments of the present invention, the discontinuous reception DRX information that the temporal information that target UE can receive downlink data is target UE.

It should be understood that, in various embodiments of the present invention, the size of the sequence number of above-mentioned 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.

Above in conjunction with Fig. 1 to Fig. 6, the method of processing downlink data according to embodiments of the present invention is described in detail from the angle of gateway, below in conjunction with Fig. 7, and Fig. 2 to Fig. 6, from the angle description of the mobile management entity method for handling downlink data according to embodiments of the present invention.

Fig. 7 shows the method 700 of processing downlink data according to embodiments of the present invention, and this method 700 includes：

S710, mobility management entity determines that target UE UE can not receive downlink data；

S720, the mobility management entity sends to gateway and indicates message for indicating that target UE can not receive the first of downlink data, in order to cached in serving gateway target UE downlink data.

In embodiments of the present invention, when the arrival of the target UE downlink data of downlink data can not be received, mobile management entity notifies cached in serving gateway target UE downlink data, it should be understood that gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, even if for example, target UE rest period reaches a minute rank, the problem of also will not there is inadequate buffer space easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

In S710, specifically, the nothing that the mobility management entity can be accessed based on target UE What line access network node was sent is used to indicate that target UE can not receive the message of downlink data, and determines that target UE is unreachable；It should be understood that, the mobility management entity can also judge that UE is unreachable by other means, not necessarily place one's entire reliance upon the reporting message of wireless access network node (such as base station), for example, the information that the mobile management entity is issued by upper system management entity knows that target UE is unreachable, and the embodiment of the present invention is not construed as limiting to this.

It should also be understood that in embodiments of the present invention, target UE can be a UE, or multiple UE, the embodiment of the present invention is not construed as limiting to this.

Alternatively, in embodiments of the present invention, the S710 mobility management entity determines that target UE UE can not receive downlink data, including：

S711, the configured information for indicating discontinuous reception DRX modes of the target UE in connected state that the wireless access network node that the mobility management entity receives target UE accesses is sent；

S712, the mobility management entity determines that target UE can not receive downlink data according to the configured information.

It should be understood that not being to be constantly in that the state of downlink data can be received when target UE is configured as DRX mode, i.e. a period of time is reachable, and a period of time is unreachable.When mobility management entity knows that target UE is configured to DRX mode, it is determined that target UE can not receive downlink data.Then sent to gateway and indicate message for indicating that target UE can not receive the first of downlink data, in order to which gateway is when target UE downlink data is reached, cache target UE downlink data.

Mobility management entity is when the downlink data for knowing target UE is assigned, i.e. gateway receives target UE downlink data, when starting caching, acquisition target UE particular state is gone again, it is reachable or unreachable, and up to when, the downlink data of caching is handed down to target UE by indicating service gateway.

Specifically, target UE is configured as connected state discontinuous reception (Connected-Discontinuous Reception, referred to as " C-DRX "), it is exactly the noncontinuity reception (DRX) that target UE is under connected state, that is target UE only opens receiver in special time period and enters the activation phase, to receive downlink data and signaling, and section closing receiver enters rest period at other times, stops receiving downlink data and signaling.

In embodiments of the present invention, when that can not receive the arrival of the target UE downlink data of downlink data, mobile management entity notifies cached in serving gateway target UE downlink data, it should be appreciated that service Gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, and data buffer storage performance is also preferable, for example, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Alternatively, in embodiments of the present invention, the S720 mobility management entity sends to gateway and indicates message for indicating that target UE can not receive the first of downlink data, including：

Alternatively, in embodiments of the present invention, S720 should be in the case where the caching of the target UE wireless access network nodes accessed be not enough, and the mobility management entity sends the first instruction message to gateway, including：

S721, the mobility management entity receives the request message for being used to ask to cache target UE downlink data of wireless access network node transmission, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity；

S722, the mobility management entity sends the first instruction message according to the request message to the gateway.

Specifically, for example during the inadequate buffer space of the corresponding RAN nodes of target UE, the RAN Node sends the request message of the downlink data for asking caching of target UE to MME, and MME sends to S-GW according to the request message and indicates message for indicating that target UE can not receive the first of downlink data (also referred to as unreachable).

Specifically, as shown in Figure 2, describe in detail with being described above unanimously, repeat no more here.

In embodiments of the present invention, for the target UE in connected state DRX (C-DRX) downlink data reach when, when MME determines the inadequate buffer space of the corresponding RAN nodes of target UE, S-GW is notified to cache target UE downlink data, so as to added on the basis of RAN node one be used for cache be in connected state DRX target UE downlink data storage location, can effectively reduce the load of RAN node；On the other hand, S-GW is relative to Radio Access Network RAN node (the especially limited small base station of spatial cache), and spatial cache is larger, data buffer storage performance is also preferable, therefore, even if target UE rest period reaches a minute rank, will not also occur caching easily empty Between it is not enough the problem of.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from by RAN node cache UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of.

It should be understood that MME can also actively be inquired about after S-GW DDN message is received to RAN node.If RAN node feedback spatial cache exceedes threshold value, indicate that SGW is data cached in DDN ACK messages；If RAN node feedback is not above threshold value, MME indicates that SGW need not be cached.

It should be understood that in embodiments of the present invention, in the case where target UE can receive downlink data, gateway can send the downlink data of caching to target UE.Mobile management entity, which obtains target UE, can receive the relevant information of downlink data, then notify to gateway, in order to issue downlink data to target UE in time.

Alternatively, in embodiments of the present invention, this method 700 also includes：

S730, the mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.It should be understood that mobility management entity can be it is determined that target UE be up in the case of, transmission is related to indicate message；Or the related of reachable temporal information sent for indicating target UE indicates message.

Alternatively, in embodiments of the present invention, target UE is in the discontinuous connection DRX mode of connected state, and S730, the mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, including：

The S731 mobility management entity is sent for asking the wireless access network node to notify target UE to stop the first request message of DRX mode to the target UE wireless access network nodes accessed；

It should be understood that target UE, which stops DRX mode, refers to that target UE leaves DRX mode, but still keep connected state.

The S732 mobility management entity receive the wireless access network node transmission be used for indicate that target UE has stopped the first confirmation message of DRX mode；

The S733 mobility management entity determines that target UE can receive downlink data, and send the second instruction message to the gateway according to first confirmation message.

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibilities to S-GW and indicates to believe Breath, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, MME requests eNB informs that UE stops eC-DRX receiving downlink data.After UE, which stops eC-DRX, is converted to reachable, MME indicates that UE is reachable to S-GW, the packet of caching is sent to UE by S-GW, it is achieved thereby that reachable in UE, in the case of can downlink data being received, the UE cached in S-GW downlink data is handed down to the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

In the embodiment above in association with Fig. 2, in the case of MME notifies that S-GW caches UE downlink data, MME is by asking RAN side gussets to allow UE stopping DRX modes receiving downlink data, knowing UE stopping DRX modes, in the case of can downlink data being received, MME is sent for indicating that the UE can receive the instruction message of downlink data to S-GW, so that, the S-GW sends the downlink data of corresponding caching according to MME instruction message to the UE.Alternatively, in embodiments of the present invention, MME can also determine that target UE can receive downlink data using other means, for example, when UE is moved to target eNB from source eNB, such as in the switching flow based on S1 interfaces, after MME receives the hand off signaling of source eNB transmissions, also it can determine that target UE is reachable, i.e., can receive downlink data.

Alternatively, in embodiments of the present invention, the S730 mobility management entity sends to the gateway and indicates message for indicating that target UE can receive the second of downlink data, including：

S734, when in the switching flow based on S1 interfaces of the mobility management entity in target UE, when receiving the hand off signaling of wireless access network node transmission of target UE accesses, determine that target UE can receive downlink data, and the second instruction message is sent to the gateway.

As shown in Figure 3, when mobility management entity (the source MME corresponded in Fig. 3) receives handover request message (S302 in such as Fig. 3), it is determined that occurring the target UE switching flow based on S1 interfaces, then as hand off signaling (such as S310 shown in Fig. 3 that the wireless access network node for receiving target UE accesses is sent, eNB state transfers message) when, determine that target UE can receive downlink data, and the second instruction message is sent to the gateway.

Specifically, as shown in Figure 4, describe in detail with being described above unanimously, repeat no more here.

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibilities to S-GW and indicates to believe Breath, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, MME receive after hand off signaling to S-GW send UE accessibility configured informations inform that UE is reachable, so that the downlink data packet of caching is issued the UE by S-GW, it is achieved thereby that reachable in UE, in the case of can downlink data being received, the UE cached in S-GW downlink data is handed down to the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

Described above is MME in the case of it is determined that target UE can receive downlink data, the related downlink data for indicating message, being cached in order to S-GW to target UE transmissions is sent to S-GW.In embodiments of the present invention, MME can also send target UE to S-GW can receive the temporal information of downlink data, specifically, for example target UE RDX information.

S735, the mobility management entity sends the second request message of the temporal information for asking target UE to receive downlink data to the target UE wireless access network nodes accessed；

S736, the mobility management entity receives the second confirmation message that target UE can receive the temporal information of downlink data that includes of wireless access network node transmission；

S737, the mobility management entity is according to second confirmation message, being sent to the gateway includes the second instruction message for the temporal information that target UE can receive downlink data, at the time of determining that target UE can receive downlink data in order to the gateway, and the downlink data of from the target UE to target UE transmission cachings.

Alternatively, in embodiments of the present invention, target UE can receive the temporal information of downlink data For target UE discontinuous reception DRX information.

It should be understood that in target UE RDX information in addition to the RDX cycles including target UE, absolute reference information all the time can also be included.

Specifically, as shown in Figure 6, describe in detail with being described above unanimously, repeat no more here.

In embodiments of the present invention, when MME receives RAN, and UE is configured to eC-DRX configured information and eNB request caching downlink datas, MME provides UE accessibility configured informations to S-GW, informs that S-GW should cache the downlink data of the UE.Therefore, in embodiments of the present invention, core net node (MME and S-GW) in RAN node inadequate buffer space, can cache the downlink data for the UE for being configured as connected state DRX, RAN node can be avoided to cache hydraulic performance decline caused by downlink data, and the packet loss being likely to occur.In addition, MME requests eNB provides the eC-DRX information of the UE, and the eC-DRX information of the UE is sent to S-GW, the reachable time is converted to so that S-GW obtains UE according to the eC-DRX information of the UE, UE up to when the downlink data of caching is sent to the UE.It is achieved thereby that reachable in UE, in the case of can downlink data being received, the UE cached in S-GW downlink data is handed down to the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

It should be understood that, in embodiments of the present invention, mobility management entity can also carry target UE in the first instruction message can receive the temporal information of downlink data, in order to which gateway is according to the first instruction message, not only know that target UE can not currently receive downlink data (also referred to as unreachable), also would know that when target UE can receive downlink data (also referred to as reachable).

Alternatively, in embodiments of the present invention, the first instruction message, which also includes target UE, can receive the temporal information of downlink data, and in order to which the gateway is in the case where target UE can receive downlink data, downlink data is sent to target UE.

It should be understood that technical scheme provided in an embodiment of the present invention can save signaling consumption to a certain extent.

S740, the mobility management entity receives the downlink data notification message for the downlink data arrival for being used to indicate target UE that the gateway is sent when receiving target UE downlink data.

It should be understood that, the gateway is when receiving target UE downlink data, the downlink data notification message that the downlink data for indicating target UE is reached is sent to the mobility management entity, it is easy to mobility management entity to know that target UE downlink data is reached, the information of downlink data can be received so as to trigger acquisition target UE, in order to which the downlink data of caching is issued to target UE by follow-up service gateway.

What mobility management entity reception gateway was sent is used to indicate the downlink data notification message that target UE downlink data is assigned；

Mobility management entity sends downlink data notification confirmation message to gateway, and target UE downlink data is cached for indicating service gateway.

Therefore, in embodiments of the present invention, when that can not receive the arrival of the target UE downlink data of downlink data, mobile management entity notifies cached in serving gateway target UE downlink data, it should be understood that, gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, and data buffer storage performance is also preferable, for example, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Above in conjunction with Fig. 1 to Fig. 7, the method of processing downlink data according to embodiments of the present invention is described in detail from the angle of gateway and mobile management entity, below in conjunction with Fig. 8, from the angle description of the wireless access network node method for handling downlink data according to embodiments of the present invention.

Fig. 8 shows the method 800 of processing downlink data according to embodiments of the present invention, and this method 800 includes：

S810, wireless access network node determines that target UE UE can not receive downlink data；

S820, the wireless access network node is sent to gateway by mobility management entity and indicates message for indicating that target UE can not receive the first of downlink data, in order to cached in serving gateway target UE downlink data；

S830, the wireless access network node is sent to the gateway by the mobility management entity and used Can receive downlink data in instruction target UE second indicates message, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

It should be understood that the RAN node is the corresponding serving Access network elements of target UE, for example, target UE Current Serving BTS, specifically such as eNB.

In embodiments of the present invention, determine that target UE can not receive downlink data, to core net node, such as mobility management entity and gateway are sent for indicating that target UE can not receive the instruction message of downlink data, in order to cached in serving gateway target UE downlink data；It should be understood that gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, even if for example, target UE rest period reaches a minute rank, the problem of also will not there is inadequate buffer space easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Alternatively, in embodiments of the present invention, the S810 wireless access network nodes determine that target UE UE can not receive downlink data, including：

In embodiments of the present invention, determine that target UE is in connected state DRX (C-DRX) pattern, when target UE downlink data is reached, mobile management entity notifies cached in serving gateway target UE downlink data, it should be understood that, gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, for example, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, The embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Alternatively, in embodiments of the present invention, the S820 wireless access network nodes sent by mobility management entity to gateway for indicate target UE can not receive downlink data first indicate message after, this method also includes：

S840, the wireless access network node is it is determined that in the case of the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching target UE is sent to the mobility management entity.

In embodiments of the present invention, when the downlink data of target UE for that can not receive downlink data is reached, when downlink data for example for the target UE in connected state DRX (C-DRX) is reached, when the inadequate buffer space of the corresponding RAN nodes of target UE, target UE downlink data is cached by S-GW.In other words, in embodiments of the present invention, cached in target UE RAN node In the case that space is sufficient, target UE downlink data is cached according to traditional scheme.In the case of the inadequate buffer space of RAN node, by core net node gateway is come caching of target UE downlink data, the method of the processing downlink data provided according to embodiments of the present invention, can compatible prior art, so as to more neatly caching of target UE downlink data.

Alternatively, in embodiments of the present invention, the S830 wireless access network nodes are sent to the gateway by the mobility management entity and indicate message for indicating that target UE can receive the second of downlink data, including：

S831, the wireless access network node receives the first request message for being used to ask to notify target UE to stop DRX mode of mobile management entity transmission；

S832, the wireless access network node notifies target UE to stop DRX mode, and in the case of it is determined that target UE stops DRX mode, sent to the mobility management entity for indicating that target UE has stopped the second instruction message of DRX mode, in order to which the mobility management entity informs that gateway target UE can receive downlink data.

Specifically, the description above in association with Fig. 2 is referred to, is repeated no more here.

In embodiments of the present invention, sent to the MME for indicating that target UE has stopped DRX the second confirmation message, in order to which MME is according to second confirmation message, notify S-GW to send the downlink data of caching to target UE.It is achieved thereby that in the case where UE can receive downlink data, the UE cached in S-GW downlink data is handed down into the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

Alternatively, in embodiments of the present invention, the S830 wireless access network nodes are sent to the gateway by the mobility management entity and referred to for indicating that target UE can receive the second of downlink data Show message, including：

S833, the wireless access network node receive the mobility management entity transmission for the second request message of the temporal information for asking target UE to receive downlink data；

S834, the wireless access network node is sent to the mobility management entity includes the second instruction message for the temporal information that target UE can receive downlink data, in order to which the mobility management entity sends the temporal information to the gateway, in order to which the gateway sends downlink data in the case where target UE can receive downlink data to target UE.

Specifically, target UE DRX information includes DRX cycle, and the DRX cycle includes activation phase and rest period, and target UE can receive downlink data in the activation phase.

The wireless access network node sends the second instruction message for the DRX information for including target UE to the mobility management entity, in order to which the mobility management entity sends target UE DRX information to the gateway, the gateway is according to target UE DRX information, at the time of determining that target UE can receive downlink data, and the downlink data of from the target UE to target UE transmission cachings.

Specifically, the description above in association with Fig. 6 is referred to, is repeated no more here.

In embodiments of the present invention, the 3rd confirmation message of the DRX information for including target UE is sent to the MME, in order to which MME notifies the 3rd confirmation message to S-GW, so that at the time of S-GW knows that target UE can receive downlink data, and then the downlink data cached is sent to target UE.It is achieved thereby that in the case where UE can receive downlink data, the UE cached in S-GW downlink data is handed down into the UE in time, it is possible to increase the efficiency of transmission of UE downlink datas, the occupancy of the downlink data of the UE to S-GW spatial cache is also released in time.

In embodiments of the present invention, for the target UE in connected state DRX (C-DRX) downlink data reach when, when it is determined that the corresponding RAN nodes of target UE inadequate buffer space when, request core net node (MME) caches target UE downlink data, so as to added on the basis of RAN node one be used for cache be in connected state DRX target UE downlink data storage location, can effectively reduce the load of RAN node；On the other hand, core net node (such as S-GW) is relative to Radio Access Network RAN node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, therefore, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from by RAN node cache UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of.

Above in conjunction with Fig. 1 to Fig. 8, the method that processing downlink data according to embodiments of the present invention is described in detail, below in conjunction with Fig. 9 to Figure 11, the equipment that processing downlink data according to embodiments of the present invention is described in detail.

Fig. 9 shows the schematic block diagram of the equipment 900 of processing downlink data according to embodiments of the present invention, and the equipment 900 includes：

Receiving module 910, for receive mobility management entity transmission be used for indicate target UE UE can not receive downlink data first indicate message；

Cache module 920, in the downlink data for receiving the target UE indicated by the first instruction message of receiving module reception, caching target UE downlink data；

Sending module 930, in the case of it is determined that target UE can receive downlink data, the target UE of cache module caching downlink data to be sent to target UE.

Therefore, in embodiments of the present invention, when the arrival of the target UE downlink data of downlink data can not be received, target UE downlink data is cached by core net node gateway, it should be understood that, gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, and data buffer storage performance is also preferable, for example, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, the embodiment of the present invention is relative to prior art, the problem of being prevented effectively from hydraulic performance decline caused by the wireless access network node caching UE accessed by UE downlink data, and be likely to occur data-bag lost the problem of, and then can improve Transmit the reliability of downlink data.

It should be understood that the equipment 900 is, for example, the gateway in the method for processing downlink data provided in an embodiment of the present invention.

Alternatively, in embodiments of the present invention, the receiving module is specifically for receiving the mobility management entity it is determined that in the case of the inadequate buffer space of the wireless access network node, this of transmission first indicates message.

Alternatively, in embodiments of the present invention, the receiving module specifically for, the first instruction message of mobility management entity transmission is received, the first instruction message is that the mobility management entity is sent based on what the wireless access network node was sent for indicating message of the target UE in connected state discontinuous reception DRX mode to the gateway.

Alternatively, in embodiments of the present invention, the sending module 930 includes：

Alternatively, in embodiments of the present invention, the 3rd instruction message includes target UE discontinuous reception DRX information.

Wherein, the sending module 930 includes：

Alternatively, in embodiments of the present invention, the sending module specifically for, in the switching flow based on S1 interfaces, when receiving the establishment indirect data forward tunneled requests of mobility management entity transmission, determine that target UE can receive downlink data, and send to the target UE target UE of caching downlink data.

Alternatively, in embodiments of the present invention, the sending module is additionally operable to, and in the downlink data for receiving the target UE indicated by the first instruction message, the downlink data notification message that the downlink data for indicating target UE is reached is sent to the mobility management entity.

It should be understood that, the gateway (S-GW) that the equipment 900 of processing downlink data according to embodiments of the present invention may correspond in the method for the processing downlink data of the embodiment of the present invention, and above and other operation and/or functions of the modules in the equipment 900 of downlink data is handled respectively to realize the corresponding flow of each methods of the Fig. 1 into Fig. 8, for sake of simplicity, will not be repeated here.

Therefore, in embodiments of the present invention, when the arrival of the target UE downlink data of downlink data can not be received, target UE downlink data is cached by core net node gateway, it should be understood that, gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, and data buffer storage performance is also preferable, for example, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Figure 10 shows the schematic block diagram of the equipment 1000 of processing downlink data according to embodiments of the present invention, and the equipment 1000 of the processing downlink data includes：

Determining module 1010, for determining that target UE UE can not receive downlink data；

First sending module 1020, for being sent to gateway for indicating that the target UE that the determining module is determined can not receive the first instruction message of downlink data, in order to the cached in serving gateway mesh Mark UE downlink data.

In embodiments of the present invention, determine that target UE can not receive downlink data, when target UE downlink data is reached, mobile management entity notifies cached in serving gateway target UE downlink data, it should be understood that, gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, and data buffer storage performance is also preferable, for example, even if target UE rest period reaches a minute rank, the problem of also inadequate buffer space will not occur easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

It should be understood that the equipment 1000 is, for example, the mobility management entity in the method for processing downlink data provided in an embodiment of the present invention.

Alternatively, in embodiments of the present invention, first sending module is specifically in the case where the caching of the target UE wireless access network nodes accessed is not enough, the first instruction message is sent to gateway.

Alternatively, in embodiments of the present invention, first sending module includes：

Alternatively, in embodiments of the present invention, the determining module includes：

Second receiving unit, for receiving the configured information for being used to indicate the discontinuous reception DRX mode that target UE is in connected state that the wireless access network node of target UE accesses is sent；

Alternatively, in embodiments of the present invention, the equipment also includes：

Second sending module 1030, message is indicated for indicating that target UE can receive the second of downlink data for being sent to the gateway, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

Alternatively, in embodiments of the present invention, target UE is in the discontinuous connection DRX mode of connected state,

Wherein, second sending module includes：

First transmitting element is additionally operable to, according to first confirmation message, determines that target UE can connect

Downlink data is received, and the second instruction message is sent to the gateway.

Alternatively, in embodiments of the present invention, second sending module specifically for, when in the switching flow based on S1 interfaces in target UE, when receiving the hand off signaling of wireless access network node transmission of target UE accesses, determine that target UE can receive downlink data, and the second instruction message is sent to the gateway.

Alternatively, in embodiments of the present invention, second sending module includes：

It should be understood that the equipment 1000 of processing downlink data according to embodiments of the present invention may correspond to this hair Mobility management entity (MME) in the method for the processing downlink data of bright embodiment, and above and other operation and/or functions of the modules in the equipment 1000 of downlink data is handled respectively to realize the corresponding flow of each methods of the Fig. 1 into Fig. 8, for sake of simplicity, will not be repeated here.

Figure 11 shows the schematic block diagram of the equipment 1100 of processing downlink data according to embodiments of the present invention, and the equipment 1100 of the processing downlink data includes：

Determining module 1110, for determining that target UE UE can not receive downlink data；

First sending module 1120, for being sent by mobility management entity to gateway for indicating that the target UE that the determining module is determined can not receive the first instruction message of downlink data, in order to cached in serving gateway target UE downlink data；

Second sending module 1130, message is indicated for indicating that target UE can receive the second of downlink data for being sent by the mobility management entity to the gateway, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

It should be understood that the equipment 1100 is, for example, the method for processing downlink data provided in an embodiment of the present invention In wireless access network node.

Alternatively, in embodiments of the present invention, mobility management entity to gateway send for indicate target UE can not receive downlink data first indicate message after, it is determined that in the case of the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching target UE is sent to the mobility management entity.

Alternatively, in embodiments of the present invention, the determining module by target UE specifically for being configured to connected state discontinuous reception DRX mode.

Alternatively, in embodiments of the present invention, the sending module of nothing second includes：

It should be understood that, wireless access network node (the RAN node that the equipment 1100 of processing downlink data according to embodiments of the present invention may correspond in the method for the processing downlink data of the embodiment of the present invention, such as eNB), and above and other operation and/or functions of the modules in the equipment 1100 of downlink data is handled respectively to realize the corresponding flow of each methods of the Fig. 1 into Fig. 8, for sake of simplicity, will not be repeated here.

As shown in figure 12, the embodiment of the present invention additionally provides a kind of gateway 1200, and the gateway 1200 includes processor 1210, memory 1220, bus system 1230, receiver 1240 and transmitter 1250.Wherein, processor 1210, memory 1220, receiver 1240 are connected with transmitter 1250 by bus system 1230, the memory 1220 is used for store instruction, the processor 1210 is used for the instruction for performing the memory 1220 storage, to control receiver 1240 to receive signal, and transmitter 1250 is controlled to send signal.Wherein, the receiver 1240 is used for, and receive mobility management entity transmission indicates message for indicating that target UE UE can not receive the first of downlink data；Processor 1210 is used for, and in the downlink data for receiving the target UE indicated by the first instruction message, caches target UE downlink data；Transmitter 1250 is used for, in the case of it is determined that target UE can receive downlink data, and the target UE of caching downlink data is sent to target UE.

Therefore, in embodiments of the present invention, determine that target UE can not receive downlink data, when target UE downlink data is reached, target UE downlink data is cached by core net node gateway, it should be understood that gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, even if for example, target UE rest period reaches a minute rank, the problem of also will not there is inadequate buffer space easily.Therefore, the embodiment of the present invention is relative to prior art, can be prevented effectively from accessed by UE wireless access network node caching UE downlink data caused by hydraulic performance decline the problem of, and be likely to occur data-bag lost the problem of, and then can improve transmission downlink data reliability.

Alternatively, in embodiments of the present invention, the receiver 1240 is specifically for receiving the mobility management entity it is determined that in the case of the inadequate buffer space of the wireless access network node, this of transmission first indicates message.

Alternatively, in embodiments of the present invention, the receiver 1240 is specifically for receiving the first instruction message of mobility management entity transmission, the first instruction message is that the mobility management entity is based on What the wireless access network node was sent is used to indicate what target UE was in the message of connected state discontinuous reception DRX mode and sent to the gateway.

Alternatively, in embodiments of the present invention, the receiver 1240 specifically for, receive mobility management entity transmission indicates message for indicating that target UE can receive the second of downlink data, the second instruction message is the mobility management entity indicates that target UE can receive the message of downlink data and to gateway transmission based on being used for of sending of the wireless access network node, or, the second instruction message is to be sent in the case that the mobility management entity receives the hand off signaling that the wireless access network node is sent in the switching flow based on S1 interfaces to the gateway；Processor 1210 is specifically used for, and according to the second instruction message, determines that target UE can receive downlink data；Transmitter 1250 is specifically for and sending to the target UE target UE of caching downlink data.

Alternatively, in embodiments of the present invention, the processor 1210 specifically for, in the switching flow based on S1 interfaces, when receiver 1240 receives the establishment indirect data forward tunneled requests of mobility management entity transmission, determine that target UE can receive downlink data, control transmitter 1250 sends the target UE of caching downlink data to target UE.

Alternatively, in embodiments of the present invention, the receiver 1240 is specifically for receive mobility management entity transmission indicates message for indicating that target UE can receive the 3rd of the temporal information of downlink data；Processor 1210 is specifically used for, and message is indicated according to the 3rd, at the time of determining that target UE can receive downlink data；Transmitter 1250 is specifically at the time of target UE can receive downlink data, the target UE of caching downlink data is sent to target UE.

Alternatively, in embodiments of the present invention, the first instruction message, which also includes target UE, can receive the temporal information of downlink data；Processor 1210 is specifically used for, and the temporal information of downlink data can be received according to target UE, at the time of determining that target UE can receive downlink data；Transmitter 1250 is specifically at the time of target UE can receive downlink data, the target UE of caching downlink data is sent to target UE.

Alternatively, in embodiments of the present invention, the processor 1210 specifically for, when receiver 1240 receives the downlink data of the target UE indicated by the first instruction message, the downlink data that control transmitter 1250 sends the downlink data arrival for indicating target UE to the mobility management entity leads to Know message.

It should be understood that, in embodiments of the present invention, the processor 1210 can be CPU (Central Processing Unit, referred to as " CPU "), the processor 1210 can also be other general processors, digital signal processor (DSP), application specific integrated circuit (ASIC), ready-made programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional processor etc..

The memory 1220 can include read-only storage and random access memory, and provide instruction and data to processor 1210.The a part of of memory 1220 can also include nonvolatile RAM.For example, memory 1220 can be with the information of storage device type.

The bus system 1230 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 1230 in figure.

In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1210 or the instruction of software form.The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and perform completion, or perform completion with the hardware in processor and software module combination.Software module can be located in random access memory, flash memory, read-only storage, the ripe storage medium in this area such as programmable read only memory or electrically erasable programmable memory, register.The storage medium is located at memory 1220, and processor 1210 reads the information in memory 1220, the step of completing the above method with reference to its hardware.To avoid repeating, it is not detailed herein.

It should be understood that, the gateway (S-GW) that gateway 1200 according to embodiments of the present invention may correspond in the method for the processing downlink data of the embodiment of the present invention, and can correspond to the equipment 900 of processing downlink data according to embodiments of the present invention, and above and other operation and/or function of the modules in gateway 1200 is respectively in order to realize the corresponding flow of each methods of the Fig. 1 into Fig. 8, for sake of simplicity, will not be repeated here.

Therefore, in embodiments of the present invention, determine that target UE can not receive downlink data, when target UE downlink data is reached, target UE downlink data is cached by core net node gateway, it should be understood that gateway is relative to wireless access network node (the especially limited small base station of spatial cache), spatial cache is larger, data buffer storage performance is also preferable, even if for example, target UE rest period reaches a minute rank, the problem of also will not there is inadequate buffer space easily.Therefore, the embodiment of the present invention is relative to prior art, the problem of being prevented effectively from hydraulic performance decline caused by the wireless access network node caching UE accessed by UE downlink data, and be likely to occur data-bag lost the problem of, And then the reliability of transmission downlink data can be improved.

As shown in figure 13, the embodiment of the present invention additionally provides a kind of mobility management entity 1300, and the network equipment 1300 includes processor 1310, memory 1320, bus system 1330, receiver 1340 and transmitter 1350.Wherein, processor 1310, memory 1320, receiver 1340 are connected with transmitter 1350 by bus system 1330, the memory 1320 is used for store instruction, the processor 1310 is used for the instruction for performing the memory 1320 storage, to control receiver 1340 to receive signal, and transmitter 1350 is controlled to send signal.Wherein, the processor 1310 is used for, and determines that target UE UE can not receive downlink data.

Alternatively, in embodiments of the present invention, the transmitter 1250 is specifically in the case where the caching of the target UE wireless access network nodes accessed is not enough, the mobility management entity sends the first instruction message to gateway.

Alternatively, in embodiments of the present invention, the receiver 1340 specifically for, receive the request message for being used to ask to cache target UE downlink data of wireless access network node transmission, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity；The transmitter 1250 is specifically for according to the request message, the first instruction message is sent to the gateway.

Alternatively, in embodiments of the present invention, the receiver 1340 is specifically for receiving the configured information for being used to indicate the discontinuous reception DRX mode that target UE is in connected state that the wireless access network node of target UE accesses is sent；The processor 1310 is specifically for according to the configured information, determining that target UE can not receive downlink data.

Alternatively, in embodiments of the present invention, transmitter 1350 is used for, and is sent to gateway and indicates message for indicating that target UE can not receive the first of downlink data, in order to cached in serving gateway target UE downlink data；Sent to the gateway for indicating that target UE can be received The second of downlink data indicates message, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

Alternatively, in embodiments of the present invention, target UE is in the discontinuous connection DRX mode of connected state, and transmitter 1350 to the wireless access network node specifically for sending for asking the wireless access network node to notify target UE to stop the first request message of DRX mode；Receiver 1340 specifically for, receive the wireless access network node transmission be used for indicate that target UE has stopped the first confirmation message of DRX mode；Transmitter 1350 is specifically for the mobility management entity determines that target UE can receive downlink data, and send the second instruction message to the gateway according to first confirmation message.

Alternatively, in embodiments of the present invention, processor 1310 specifically for, when the mobility management entity is in the switching flow based on S1 interfaces, when receiver 1340 receives the hand off signaling of wireless access network node transmission, determine that target UE can receive downlink data, and control transmitter 1350 to send the second instruction message to the gateway.

Alternatively, in embodiments of the present invention, transmitter 1350 is specifically for sending the second request message of the temporal information for asking target UE to receive downlink data to the target UE wireless access network nodes accessed；Receiver 1340 is specifically for receiving the second confirmation message that target UE can receive the temporal information of downlink data that includes of wireless access network node transmission；Transmitter 1350 is used for, according to second confirmation message, being sent to the gateway includes the second instruction message for the temporal information that target UE can receive downlink data, at the time of determining that target UE can receive downlink data in order to the gateway, and the downlink data of from the target UE to target UE transmission cachings.

Alternatively, in embodiments of the present invention, receiver 1340 is specifically for receiving the downlink data notification message for the downlink data arrival for being used to indicate target UE that the gateway is sent when receiving target UE downlink data.

It should be understood that, in embodiments of the present invention, the processor 1310 can be CPU (Central Processing Unit, referred to as " CPU "), the processor 1310 can also be other general processors, digital signal processor (DSP), application specific integrated circuit (ASIC), ready-made programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional processor etc..

The memory 1320 can include read-only storage and random access memory, and provide instruction and data to processor 1310.The a part of of memory 1320 can also include nonvolatile RAM.For example, memory 1320 can be with the information of storage device type.

The bus system 1330 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 1330 in figure.

In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1310 or the instruction of software form.The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and perform completion, or perform completion with the hardware in processor and software module combination.Software module can be located in random access memory, flash memory, read-only storage, the ripe storage medium in this area such as programmable read only memory or electrically erasable programmable memory, register.The storage medium is located at memory 1320, and processor 1310 reads the information in memory 1320, the step of completing the above method with reference to its hardware.To avoid repeating, it is not detailed herein.

It should be understood that, the mobility management entity (MME) that the equipment 1000 of processing downlink data according to embodiments of the present invention may correspond in the method for the processing downlink data of the embodiment of the present invention, and above and other operation and/or functions of the modules in the equipment 1000 of downlink data is handled respectively to realize the corresponding flow of each methods of the Fig. 1 into Figure 13, for sake of simplicity, will not be repeated here.

As shown in figure 14, inventive embodiments additionally provide a kind of wireless access network node 1400, the nothing Line access network node 1400 includes processor 1410, memory 1420, bus system 1430, receiver 1440 and transmitter 1450.Wherein, processor 1410, memory 1420, receiver 1440 are connected with transmitter 1450 by bus system 1430, the memory 1420 is used for store instruction, the processor 1410 is used for the instruction for performing the memory 1420 storage, to control receiver 1440 to receive signal, and transmitter 1450 is controlled to send signal.Wherein, the processor 1410 is used for, and determines that target UE UE can not receive downlink data；Transmitter 1450 is used for, and is sent by mobility management entity to gateway and indicates message for indicating that target UE can not receive the first of downlink data, in order to cached in serving gateway target UE downlink data；Sent by the mobility management entity to the gateway and indicate message for indicating that target UE can receive the second of downlink data, in order to which the gateway sends the target UE of caching downlink data to target UE in the case where target UE can receive downlink data.

Alternatively, in embodiments of the present invention, transmitter 1450 is specifically for it is determined that in the case of the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching target UE is sent to the mobility management entity.

Alternatively, in embodiments of the present invention, processor 1410 by target UE specifically for being configured to connected state discontinuous reception DRX mode.

Alternatively, in embodiments of the present invention, receiver 1440 is specifically for receiving the first request message for being used to ask to notify target UE to stop DRX mode of mobile management entity transmission；Processor 1410 specifically for, target UE is notified to stop DRX mode, and in the case of it is determined that target UE stops DRX mode, control transmitter 1450 is sent for indicating that target UE has stopped the second instruction message of DRX mode, in order to which the mobility management entity informs that gateway target UE can receive downlink data to the mobility management entity.

Alternatively, in embodiments of the present invention, receiver 1440 specifically for, receive the mobility management entity transmission for the second request message of the temporal information for asking target UE to receive downlink data；Transmitter 1450 is used for, being sent to the mobility management entity includes the second instruction message for the temporal information that target UE can receive downlink data, in order to which the mobility management entity sends the temporal information to the gateway, in order to which the gateway sends downlink data in the case where target UE can receive downlink data to target UE.

The second request message for being used to ask target UE DRX information of mobility management entity transmission is received, target UE DRX information includes DRX cycle, and the DRX cycle includes activation phase and rest period, and target UE can receive downlink data in the activation phase；Transmitter 1450 is used for, the the second instruction message for the DRX information for including target UE is sent to the mobility management entity, in order to which the mobility management entity sends target UE DRX information to the gateway, the gateway is according to target UE DRX information, at the time of determining that target UE can receive downlink data, and the downlink data of from the target UE to target UE transmission cachings.

It should be understood that, in embodiments of the present invention, the processor 1410 can be CPU (Central Processing Unit, referred to as " CPU "), the processor 1410 can also be other general processors, digital signal processor (DSP), application specific integrated circuit (ASIC), ready-made programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional processor etc..

The memory 1420 can include read-only storage and random access memory, and provide instruction and data to processor 1410.The a part of of memory 1420 can also include nonvolatile RAM.For example, memory 1420 can be with the information of storage device type.

The bus system 1430 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 1430 in figure.

In implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 1410 or the instruction of software form.The step of method with reference to disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and perform completion, or perform completion with the hardware in processor and software module combination.Software module can be located at random access memory, flash memory, read-only storage, the ripe storage medium in this area such as programmable read only memory or electrically erasable programmable memory, register In.The storage medium is located at memory 1420, and processor 1410 reads the information in memory 1420, the step of completing the above method with reference to its hardware.To avoid repeating, it is not detailed herein.

It should be understood that, wireless access network node (the RAN node that the equipment 1100 of processing downlink data according to embodiments of the present invention may correspond in the method for the processing downlink data of the embodiment of the present invention, such as eNB), and above and other operation and/or functions of the modules in the equipment 1100 of downlink data is handled respectively to realize the corresponding flow of each methods of the Fig. 1 into Figure 14, for sake of simplicity, will not be repeated here.

It should also be understood that the differentiation that first, second, third and various numeral numberings that are referred to herein only are carried out for convenience of description, is not intended to limit the scope of the embodiment of the present invention.

It should be understood that 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.

Those of ordinary skill in the art are it is to be appreciated that the unit and algorithm steps of each example described with reference to the embodiments described herein, can be realized with the combination of electronic hardware or computer software and electronic hardware.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, it is for convenience and simplicity of description, above-mentioned to retouch The specific work process of system, device and the unit stated, 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.Another, it, by some interfaces, the INDIRECT COUPLING or communication connection of device or unit, can be electrical, machinery or other forms that shown or discussed coupling or direct-coupling or communication connection each other, which can be,.

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 this embodiment scheme according to the actual needs.

In addition, each functional unit in each of the invention embodiment can be integrated in a processing unit or unit is individually physically present, can also two or more units it is integrated in a unit.

If the function is realized using in the form of SFU software functional unit and as independent production marketing or in use, can be stored in a computer read/write memory medium.Understood based on such, the part or the part of the technical scheme that technical scheme substantially contributes to prior art in other words can be embodied in the form of software product, the computer software product is stored in a storage medium, including some instructions to cause a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of each embodiment methods described of the invention.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.

It is described above; only embodiment of the invention, but protection scope of the present invention is not limited thereto, any one skilled in the art the invention discloses technical scope in; change or replacement can be readily occurred in, should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims

A kind of method for handling downlink data, it is characterised in that including：

What gateway reception mobility management entity was sent is used to indicate that target UE UE can not receive the first of downlink data and indicate message；

The gateway caches the downlink data of the target UE when receiving the downlink data of the target UE；

The gateway sends the target UE of caching downlink data to the target UE in the case of it is determined that the target UE can receive downlink data.
According to the method described in claim 1, it is characterised in that the gateway sends the target UE of caching downlink data to the target UE in the case of it is determined that the target UE can receive downlink data, including：

What the gateway reception mobility management entity was sent is used to indicate that the target UE can receive the second of downlink data and indicate message；

The gateway indicates message according to described second, determines that the target UE can receive downlink data, and the downlink data of from the target UE to the target UE transmissions caching.
According to the method described in claim 1, it is characterised in that the gateway sends the target UE of caching downlink data to the target UE in the case of it is determined that the target UE can receive downlink data, including：

What the gateway reception mobility management entity was sent is used to indicate that the target UE can receive the 3rd of the temporal information of downlink data and indicate message；

The gateway indicates message according to the described 3rd, at the time of determining that the target UE can receive downlink data；

The gateway sends the target UE of caching downlink data to the target UE at the time of target UE can receive downlink data.
Method according to claim 3, it is characterised in that the 3rd instruction message includes the discontinuous reception DRX information of the target UE.
According to the method described in claim 1, it is characterised in that the first instruction message, which also includes the target UE, can receive the temporal information of downlink data；

Wherein, the gateway sends the target UE of caching downlink data to the target UE in the case of it is determined that the target UE can receive downlink data, including：

The gateway can receive the temporal information of downlink data according to the target UE, determine institute At the time of stating target UE and can receive downlink data；

The gateway sends the target UE of caching downlink data to the target UE at the time of target UE can receive downlink data.
Method according to claim 5, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.
According to the method described in claim 1, it is characterised in that the gateway sends the target UE of caching downlink data to the target UE in the case of it is determined that the target UE can receive downlink data, including：

The gateway is in the switching flow based on S1 interfaces of the target UE, when receiving the establishment indirect data forward tunneled requests that the mobility management entity is sent, determine that the target UE can receive downlink data, and the downlink data of from the target UE to the target UE transmissions caching.
Method according to any one of claim 1 to 7, it is characterised in that methods described also includes：

The gateway sends the downlink data notification message that the downlink data for indicating the target UE is reached in the downlink data for receiving the target UE indicated by the first instruction message to the mobility management entity.
A kind of method for handling downlink data, it is characterised in that including：

Mobility management entity determines that target UE UE can not receive downlink data；

The mobility management entity sends to gateway and indicates message for indicating that the target UE can not receive the first of downlink data, in order to the downlink data of target UE described in the cached in serving gateway.
Method according to claim 9, it is characterised in that the mobility management entity sends to gateway and indicates message for indicating that the target UE can not receive the first of downlink data, including：

In the case where the caching of the target UE wireless access network nodes accessed is not enough, the mobility management entity sends described first to gateway and indicates message.
Method according to claim 10, it is characterised in that in the case that the caching in the target UE wireless access network nodes accessed is not enough, the mobility management entity sends described first to gateway and indicates message, including：

The request that is used for that the mobility management entity receives the wireless access network node transmission is cached The request message of the downlink data of the target UE, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity；

The mobility management entity sends described first according to the request message, to the gateway and indicates message.
Method according to any one of claim 9 to 11, it is characterised in that the mobility management entity determines that target UE UE can not receive downlink data, including：

The mobility management entity receives the configured information for being used to indicate the discontinuous reception DRX mode that the target UE is in connected state that the wireless access network node of the target UE accesses is sent；

The mobility management entity determines that the target UE can not receive downlink data according to the configured information.
Method according to any one of claim 9 to 12, it is characterised in that methods described also includes：

The mobility management entity sends to the gateway and indicates message for indicating that the target UE can receive the second of downlink data, in order to which the gateway sends the target UE of caching downlink data to the target UE in the case where the target UE can receive downlink data.
Method according to claim 13, it is characterised in that the target UE is in the discontinuous connection DRX mode of connected state,

Wherein, the mobility management entity sends to the gateway and indicates message for indicating that the target UE can receive the second of downlink data, including：

The mobility management entity is sent for asking the wireless access network node to notify the target UE to stop the first request message of DRX mode to the target UE wireless access network nodes accessed；

What the mobility management entity reception wireless access network node was sent is used to indicate that the target UE has stopped the first confirmation message of DRX mode；

The mobility management entity determines that the target UE can receive downlink data, and send the second instruction message to the gateway according to first confirmation message.
Method according to claim 13, it is characterised in that the mobility management entity sends to the gateway and indicates message for indicating that the target UE can receive the second of downlink data, including：

When in the switching flow based on S1 interfaces of the mobility management entity in the target UE, During the hand off signaling for the wireless access network node transmission for receiving the target UE accesses, determine that the target UE can receive downlink data, and the second instruction message is sent to the gateway.
Method according to claim 13, it is characterised in that the mobility management entity sends to the gateway and indicates message for indicating that the target UE can receive the second of downlink data, including：

The mobility management entity sends the second request message of the temporal information for asking the target UE to receive downlink data to the target UE wireless access network nodes accessed；

The mobility management entity receives the second confirmation message of the temporal information that downlink data can be received including the target UE that the wireless access network node is sent；

The mobility management entity is according to second confirmation message, being sent to the gateway includes the second instruction message for the temporal information that the target UE can receive downlink data, at the time of determining that the target UE can receive downlink data in order to the gateway, and the downlink data of from the target UE to target UE transmission cachings.
Method according to claim 16, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.
Method according to any one of claim 9 to 12, it is characterized in that, the first instruction message, which also includes the target UE, can receive the temporal information of downlink data, in order at the time of the gateway, which obtains the target UE, to receive downlink data, to send downlink data to the target UE.
Method according to claim 18, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.
Method according to any one of claim 9 to 19, it is characterised in that methods described also includes：

The mobility management entity receives the downlink data notification message for the downlink data arrival for being used to indicate the target UE that the gateway is sent when receiving the downlink data of the target UE.
A kind of method for handling downlink data, it is characterised in that including：

Wireless access network node determines that target UE UE can not receive downlink data；

The wireless access network node is sent to gateway by mobility management entity and indicates message for indicating that the target UE can not receive the first of downlink data, in order to the downlink data of target UE described in the cached in serving gateway；

The wireless access network node is sent by the mobility management entity to the gateway Message is indicated for indicating that the target UE can receive the second of downlink data, in order to which the gateway sends the target UE of caching downlink data to the target UE in the case where the target UE can receive downlink data.
Method according to claim 21, it is characterised in that the wireless access network node sent by mobility management entity to gateway for indicate the target UE can not receive downlink data first indicate message after, methods described also includes：

The wireless access network node is it is determined that during the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching the target UE is sent to the mobility management entity.
Method according to claim 21 or 22, it is characterised in that the wireless access network node determines that target UE UE can not receive downlink data, including：

The target UE is configured to the discontinuous reception DRX mode of connected state by the wireless access network node.
Method according to claim 23, it is characterised in that the wireless access network node is sent to the gateway by the mobility management entity and indicates message for indicating that the target UE can receive the second of downlink data, including：

The wireless access network node receives the first request message for being used to ask to notify the target UE to stop DRX mode that the mobile management entity is sent；

The wireless access network node notifies the target UE to stop DRX mode, and in the case of it is determined that the target UE stops DRX mode, sent to the mobility management entity and indicate message for indicating that the target UE has stopped described the second of DRX mode, in order to which the mobility management entity informs that target UE can receive downlink data described in the gateway.
Method according to claim 23, it is characterised in that the wireless access network node is sent to the gateway by the mobility management entity and indicates message for indicating that the target UE can receive the second of downlink data, including：

The wireless access network node receives the second request message of the temporal information for being used to ask the target UE to receive downlink data that the mobility management entity is sent；

The wireless access network node is sent to the mobility management entity includes the second instruction message for the temporal information that the target UE can receive downlink data, in order to which the mobility management entity sends the temporal information to the gateway, in order to which the gateway sends downlink data in the case where the target UE can receive downlink data to the target UE.
Method according to claim 25, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.
A kind of equipment for handling downlink data, it is characterised in that including：

Receiving module, for receive mobility management entity transmission be used for indicate target UE UE can not receive downlink data first indicate message；

Cache module, for when receiving the receiving module and receiving the downlink data of the target UE, caching the downlink data of the target UE；

Sending module, in the case of it is determined that the target UE can receive downlink data, the target UE of cache module caching downlink data to be sent to the target UE.
Equipment according to claim 27, it is characterised in that the sending module includes：

First receiving unit, indicates that the target UE can receive the second of downlink data and indicate message for being used for of receiving that the mobility management entity sends；

First transmitting element, second for being received according to first receiving unit indicates message, determines that the target UE can receive downlink data, and the downlink data of from the target UE to the target UE transmissions caching.
Equipment according to claim 27, it is characterised in that the sending module includes：

Second receiving unit, indicates that the target UE can receive the 3rd of the temporal information of downlink data and indicate message for being used for of receiving that the mobility management entity sends；

First determining unit, for being received according to second receiving unit the 3rd indicates message, at the time of determining that the target UE can receive downlink data；

Second transmitting element, at the time of the target UE determined for first determining unit can receive downlink data, the target UE of caching downlink data is sent to the target UE.
Equipment according to claim 29, it is characterised in that the 3rd instruction message includes the discontinuous reception DRX information of the target UE.
Equipment according to claim 27, it is characterised in that the first instruction message, which also includes the target UE, can receive the temporal information of downlink data；

Wherein, the sending module includes：

Second determining unit, for the temporal information of downlink data can be received according to the target UE, at the time of determining that the target UE can receive downlink data；

3rd transmitting element, at the time of the target UE for being determined in second determining unit can receive downlink data, the target UE of caching downlink data is sent to the target UE.
Equipment according to claim 31, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.
Equipment according to claim 27, it is characterized in that, the sending module specifically for, in the switching flow based on S1 interfaces, when receiving the establishment indirect data forward tunneled requests that the mobility management entity is sent, determine that the target UE can receive downlink data, and the downlink data of from the target UE to the target UE transmissions caching.
Equipment according to any one of claim 27 to 33, it is characterized in that, the sending module is additionally operable to, in the downlink data for receiving the target UE indicated by the first instruction message, the downlink data notification message that the downlink data for indicating the target UE is reached is sent to the mobility management entity.
A kind of equipment for handling downlink data, it is characterised in that including：

Determining module, for determining that target UE UE can not receive downlink data；

First sending module, for being sent to gateway for indicating that the target UE that the determining module is determined can not receive the first instruction message of downlink data, in order to the downlink data of target UE described in the cached in serving gateway.
Equipment according to claim 35, it is characterised in that first sending module is specifically in the case where the caching of the target UE wireless access network nodes accessed is not enough, sending described first to gateway and indicating message.
Equipment according to claim 36, it is characterised in that first sending module includes：

First receiving unit, for receiving the request message for being used to ask caching target UE downlink data that the wireless access network node is sent, wherein, the request message be the wireless access network node it is determined that the wireless access network node inadequate buffer space when sent to the mobility management entity；

First transmitting element, for the request message received according to first receiving unit, sends described first to the gateway and indicates message.
Equipment according to any one of claim 35 to 37, it is characterised in that the determining module includes：

Second receiving unit, for receiving the configured information for being used to indicate the discontinuous reception DRX mode that the target UE is in connected state that the wireless access network node of the target UE accesses is sent；

Determining unit, for the configured information received according to second receiving unit, it is determined that described Target UE can not receive downlink data.
Equipment according to any one of claim 35 to 38, it is characterised in that the equipment also includes：

Second sending module, message is indicated for indicating that the target UE can receive the second of downlink data for being sent to the gateway, in order to which the gateway sends the target UE of caching downlink data to the target UE in the case where the target UE can receive downlink data.
Equipment according to claim 39, it is characterised in that the target UE is in the discontinuous connection DRX mode of connected state,

Wherein, second sending module includes：

Second transmitting element, for being sent to the target UE wireless access network nodes accessed for asking the wireless access network node to notify the target UE to stop the first request message of DRX mode；

3rd receiving unit, indicates that the target UE has stopped the first confirmation message of DRX mode for being used for of receiving that the wireless access network node sends；

Second transmitting element is additionally operable to, according to first confirmation message, determines that the target UE can receive downlink data, and send the second instruction message to the gateway.
Equipment according to claim 39, it is characterized in that, second sending module specifically for, when in the switching flow based on S1 interfaces in the target UE, during the hand off signaling for the wireless access network node transmission for receiving the target UE accesses, determine that the target UE can receive downlink data, and the second instruction message is sent to the gateway.
Equipment according to claim 39, it is characterised in that second sending module includes：

3rd transmitting element, the second request message for sending the temporal information for asking the target UE to receive downlink data to the target UE wireless access network nodes accessed；

4th receiving unit, the second confirmation message for receiving the temporal information that downlink data can be received including the target UE that the wireless access network node is sent；

3rd transmitting element is additionally operable to, according to second confirmation message, being sent to the gateway includes the second instruction message for the temporal information that the target UE can receive downlink data, at the time of determining that the target UE can receive downlink data in order to the gateway, and the downlink data of from the target UE to target UE transmission cachings.
Equipment according to claim 42, it is characterised in that the target UE can connect The temporal information for receiving downlink data is the discontinuous reception DRX information of the target UE.
Equipment according to any one of claim 35 to 38, it is characterized in that, the first instruction message, which also includes the target UE, can receive the temporal information of downlink data, in order to which the gateway is in the case where the target UE can receive downlink data, downlink data is sent to the target UE.
Equipment according to claim 44, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.
Equipment according to any one of claim 35 to 45, it is characterised in that the equipment also includes：

Receiving module, the downlink data notification message for receiving the downlink data arrival for being used to indicate the target UE that the gateway is sent when receiving the downlink data of the target UE.
A kind of equipment for handling downlink data, it is characterised in that including：

Determining module, for determining that target UE UE can not receive downlink data；

First sending module, indicates message, in order to the downlink data of target UE described in the cached in serving gateway for being sent by mobility management entity to gateway for indicating that the target UE can not receive the first of downlink data；

Second sending module, message is indicated for indicating that the target UE can receive the second of downlink data for being sent by the mobility management entity to the gateway, in order to which the gateway sends the target UE of caching downlink data to the target UE in the case where the target UE can receive downlink data.
Equipment according to claim 47, it is characterised in that the equipment also includes：

3rd sending module, for it is determined that during the wireless access network node inadequate buffer space, the request message for asking the downlink data for caching the target UE is sent to the mobility management entity.
Equipment according to claim 47 or 48, it is characterised in that the determining module by the target UE specifically for being configured to connected state discontinuous reception DRX mode.
Equipment according to claim 49, it is characterised in that second sending module includes：

First receiving unit, for receiving the first request message for being used to ask to notify the target UE to stop DRX mode that the mobile management entity is sent；

First transmitting element, for notifying the target UE to stop DRX mode, and it is determined that described In the case that target UE stops DRX mode, sent to the mobility management entity and indicate message for indicating that the target UE has stopped described the second of DRX mode, in order to which the mobility management entity informs that target UE can receive downlink data described in the gateway.
Equipment according to claim 49, it is characterised in that the sending module of nothing second includes：

Second receiving unit, for receiving that the mobility management entity sends for the second request message of the temporal information for asking the target UE to receive downlink data；

Second transmitting element, include the second instruction message for the temporal information that the target UE can receive downlink data for being sent to the mobility management entity, in order to which the mobility management entity sends the temporal information to the gateway, in order to which the gateway is in the case where the target UE can receive downlink data, downlink data is sent to the target UE.
Equipment according to claim 51, it is characterised in that the discontinuous reception DRX information that the temporal information that the target UE can receive downlink data is the target UE.