WO2017000312A1

WO2017000312A1 - Method and device for processing downlink data

Info

Publication number: WO2017000312A1
Application number: PCT/CN2015/083208
Authority: WO
Inventors: 张万强; 黄正磊; 邓强
Original assignee: 华为技术有限公司
Priority date: 2015-07-02
Filing date: 2015-07-02
Publication date: 2017-01-05
Also published as: CN106489276A

Abstract

Provided are a method and device for processing downlink data. The method comprises: a service gateway receiving a first indication message which is sent by a mobility management entity and is used for indicating that a target UE cannot receive the downlink data; when the service gateway receives the downlink data of the target UE indicated by the first indication message, caching the downlink data of the target UE; and the service gateway sending the cached downlink data of the target UE to the target UE when it is determined that the target UE can receive the downlink data. In the embodiment of the invention, the service gateway is used for caching the downlink data of the target UE; and thus compared with the prior art, the problem that performance is reduced because the downlink data of the UE is cached through a wireless access network node, and the problem that loss of a data packet can occur can be effectively avoided.

Description

Method and device for processing downlink data

Technical field

Embodiments of the present invention relate to the field of communications, and, more particularly, to a method and apparatus for processing downlink data.

Background technique

In order to support the evolution of the wireless side (for example, Long Term Evolution (LTE), the 3rd Generation Partnership Project (3GPP)) began researching the network side in December 2004. System Architecture Evolution (SAE). LTE and SAE form an Evolved Packet System (EPS). The EPS network architecture uses an end-to-end Internet Protocol (Internet Protocol). Referred to as "IP") networking and flat network structure, and fully consider the compatibility with existing 2G/3G networks.

In the EPS network architecture, the main network functional entities are:

1) Evolved Universal Terrestrial Radio Access Network (EUTRAN): a network composed of multiple eNodeBs for implementing physical layer functions, resource scheduling functions, and radio resource management functions. Wireless access control and mobility management. The eNodeB is connected to the serving gateway (Serving Gateway, referred to as "S-GW") through the user plane interface S1-U for transmitting user data; the eNodeB is connected to the MME through the control plane interface S1-MME, and adopts the S1-AP protocol. Realize functions such as radio access bearer control.

2) Mobility Management Entity (MME): It is mainly responsible for all control plane functions of user session management, including non-access stratum (Non Access Stratum, referred to as "NAS") signaling and security. Management of the tracking area, PDN Gateway (P-GW), and S-GW selection.

3) S-GW: mainly responsible for data transmission, forwarding, and routing switching of user equipment (User Equipment, referred to as "UE"), and as a local mobility anchor point when the UE switches between eNodeBs, for each UE There is only one S-GW serving at a time.

4) P-GW: an anchor point that is connected as a Packet Data Network ("PDN"), and is responsible for the Internet Protocol ("IP") of the UE. Address allocation, data packet filtering of the UE, rate control, generation of billing information, and the like.

In the EPS network architecture, the EPS connection management (EPS Connection Management, referred to as "ECM") status of the UE includes: ECM-IDLE (ie, idle state) and ECM-CONNECTED (ie, connected state), and the ECM reflects the UE's letter. Let the connection feature.

In the idle state (ECM-IDLE), there is no NAS signaling connection between the UE and the network, for example, does not include a Radio Resource Control (RRC) connection and an S1-MME connection; State (ECM-CONNECTED), there is a NAS signaling connection between the UE and the network, including RRC connection and S1-MME connection.

If there is no data transmission for a long time, that is, when there is no NAS signaling connection between the UE and the network, the UE enters an idle state. In the idle state, the UE mainly listens to the paging channel and the broadcast channel. If the UE wants to listen to the user data channel, it must switch from the idle state to the connected state. For example, if the UE is in an idle state, when the EPS network receives the downlink data packet or signaling of the UE, the EPS network initiates a network side trigger service request process, in which the MME initiates in the tracking area where the current UE is located. Paging, the UE will switch to the connected state in response to the MME's paging, and then listen to the user data channel to receive data or signaling. The network side triggers the service request process as follows:

Step 1: After the S-GW receives the downlink data packet of the UE, the S-GW sends a downlink data notification message to the MME.

Step 2: After receiving the downlink data notification message, the MME searches for the corresponding UE context, and returns an acknowledgement message to the S-GW.

Step 3: The MME sends a paging to all the eNodeBs in the tracking area where the UE is located, and the paging message sent to the eNodeB carries the UE identity (IMSI or P-TMSI, etc.) of the UE, paging priority, and the like;

Step 4: The eNodeB pages the UE according to the received paging message.

Step 5: The UE responds to the paging, initiates a service request procedure, establishes a user plane, and starts preparing to receive downlink data.

Discontinuous Reception (DRX) is a mode of operation that saves UE power consumption. If the UE adopts DRX, the UE only turns on the receiver to enter the activation period for a certain period of time to receive downlink data and signaling, and turns off the receiver to enter the sleep period at other time periods, and 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"), wherein the idle state DRX refers to the discontinuous reception (DRX) when the UE is in the idle (IDLE) state, and the connected state DRX is the discontinuity of the UE in the connected state. Sexual reception (DRX).

The DRX cycle is called the DRX cycle, and one DRX cycle is divided into an active phase and a dormant phase. The DRX cycle is further divided into a long cycle and a short cycle, wherein the long cycle sleep period is longer, and the short cycle sleep period is shorter, and the long period and the short period activation period are the same. In addition, the long period is an integer multiple of the short period.

To further optimize the power consumption of the UE, the 3GPP extends the DRX in R12 to determine extended discontinuous reception ("eDRX"): the duration of the sleep period is increased relative to DRX, for example, For the idle state UE, the main idea is to extend the paging DRX to a relatively long time value, so that the interval at which the UE wakes up to listen for the paging message becomes longer, thereby achieving the purpose of power saving. For the connected state UE, the main idea is to extend the connected state DRX to a relatively long time value. During the DRX cycle, the UE turns off the wireless receiving and transmitting module, thereby achieving power saving purposes. Extended discontinuous reception (eDRX) includes Extended Connected-Discontinuous Reception (eX-DRX) and Extended Idle-Discontinuous Reception (eI-DRX). .

For the UE in the extended connected state DRX (eC-DRX), when the downlink data of the UE arrives, the core network user plane node serving gateway S-GW sends the downlink data of the UE to the given context of the UE. RAN node (eg eNB). Since the UE adopts the eC-DRX and cannot receive the downlink data immediately, the eNB has to buffer the downlink data of the UE, and the buffered downlink data can be sent to the UE until the UE can receive the downlink data. Generally, the UE can also be used. The state in which downlink data can be received is called UE reachable.

As can be seen from the above, in the current technology, the eNB needs to buffer downlink data of the UE configured as eC-DRX. If the number of UEs is large, such as a Machine Type Communication (MTC) device such as a sensor, the eNB needs to buffer a large amount of downlink data; in addition, for some MTC devices that rarely exchange data with the network side. The eC-DRX cycle can reach the level of several minutes. The eNB may need to cache a large number of downlink data packets for a long time, which may affect the eNB's cache performance, especially for small base stations with limited buffer capacity, and may also result in insufficient eNB space for the eNB. The downstream data is buffered and the data packet is directly discarded.

Summary of the invention

The embodiments of the present invention provide a method and a device for processing downlink data, which can effectively avoid the problem of performance degradation caused by a radio access network node (for example, an eNB) buffering downlink data of a UE, and a problem of packet loss that may occur.

In a first aspect, a method of processing downlink data is provided, the method comprising:

The serving gateway receives a first indication message that is sent by the mobility management entity and is used to indicate that the target user equipment UE is not capable of receiving downlink data.

The serving gateway caches downlink data of the target UE when receiving the downlink data of the target UE indicated by the first indication message;

The serving gateway sends the cached downlink data of the target UE to the target UE if it is determined that the target UE can receive downlink data.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the serving gateway receives the first indication message that is sent by the mobility management entity to indicate that the target user equipment UE is not capable of receiving the downlink data, and includes:

The serving gateway receives the first indication message that is sent by the mobility management entity when determining that the buffer space of the radio access network node accessed by the target UE is insufficient.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the serving gateway receives, by the mobility management entity, the target user equipment UE The first indication message that receives the downlink data includes:

The serving gateway receives the first indication message sent by the mobility management entity, where the first indication message is sent by the mobility management entity based on the radio access network node to indicate that the target UE is in a connected state discontinuous reception DRX The mode message is sent to the service gateway.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, the serving gateway, when determining that the target UE can receive downlink data, sends the cached target UE to the target UE. Downstream data, including:

Receiving, by the mobility management entity, a second indication message that is sent by the mobility management entity to indicate that the target UE is capable of receiving downlink data, where the second indication message is sent by the mobility management entity based on the radio access network node The target UE can receive the downlink data message and send the message to the service gateway, or the second indication message is that the mobility management entity receives the handover signal sent by the radio access network node in the S1 interface-based handover procedure. Sent to the service gateway in the case of a command;

Determining, by the serving gateway, that the target UE can receive downlink data according to the second indication message, And sending the cached downlink data of the target UE to the target UE.

With reference to the first aspect or the first or second implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the serving gateway, when determining that the target UE can receive downlink data, to the target The UE sends the buffered downlink data of the target UE, including:

Receiving, by the serving gateway, a third indication message sent by the mobility management entity to indicate time information that the target UE can receive downlink data;

Determining, by the serving gateway, a time at which the target UE can receive downlink data according to the third indication message;

The serving gateway sends the buffered downlink data of the target UE to the target UE at a time when the target UE can receive downlink data.

In conjunction with the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the third indication message includes discontinuous received DRX information of the target UE.

With reference to the first aspect or the first or second implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the first indication message further includes time information that the target UE can receive downlink data;

The service gateway sends the cached downlink data of the target UE to the target UE, where the target gateway is configured to receive the downlink data, including:

The serving gateway determines, according to the time information that the target UE can receive the downlink data, the time at which the target UE can receive the downlink data;

With reference to the first or the sixth implementation manner of the first aspect, in the seventh implementation manner of the first aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

With reference to the first aspect or the first or second implementation manner of the first aspect, in an eighth implementation manner of the first aspect, the serving gateway, in determining that the target UE is capable of receiving downlink data, is directed to the target The UE sends the buffered downlink data of the target UE, including:

The serving gateway determines, in the handover process based on the S1 interface, when the indirect data forwarding tunnel request sent by the mobility management entity is received, determining that the target UE can receive downlink data, and sending the cached to the target UE Downlink data of the target UE.

In combination with the first aspect and the foregoing implementation manner, in a ninth implementation manner of the first aspect, The method also includes:

When receiving the downlink data of the target UE indicated by the first indication message, the serving gateway sends a downlink data notification message indicating that the downlink data of the target UE arrives to the mobility management entity.

The second aspect provides a method for processing downlink data, the method comprising:

The mobility management entity determines that the target user equipment UE is not capable of receiving downlink data;

The mobility management entity sends a first indication message to the serving gateway to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway buffers downlink data of the target UE.

With reference to the second aspect, in a first implementation manner of the second aspect, the mobility management entity sends, to the serving gateway, a first indication message that is used to indicate that the target UE is not capable of receiving downlink data, including:

The mobility management entity sends the first indication message to the serving gateway if the buffer of the radio access network node accessed by the target UE is insufficient.

With reference to the first implementation manner of the second aspect, in a second implementation manner of the second aspect, the mobility management entity sends the service to the service when the cache of the radio access network node accessed by the target UE is insufficient. The gateway sends the first indication message, including:

Receiving, by the mobility management entity, a request message sent by the radio access network node for requesting to buffer downlink data of the target UE, where the request message is that the radio access network node determines a cache of the radio access network node Sent to the mobility management entity when there is insufficient space;

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

With the foregoing implementation manner of the second aspect, in a third implementation manner of the second aspect, the mobility management entity determines that the target user equipment UE is not capable of receiving downlink data, including:

Receiving, by the mobility management entity, indication information that is sent by the radio access network node that is accessed by the target UE, and that indicates that the target UE is in a connected state, in a discontinuous reception DRX mode;

The mobility management entity determines, according to the indication information, that the target UE cannot receive downlink data.

With reference to the second aspect and the foregoing implementation manner, in a fourth implementation manner of the second aspect, the method further includes:

The mobility management entity sends a second indication message to the serving gateway to indicate that the target UE can receive downlink data, so that the serving gateway can receive downlink data at the target UE. In the case, the buffered downlink data of the target UE is sent to the target UE.

With reference to the fourth implementation manner of the second aspect, in a fifth implementation manner of the second aspect, the target UE is in a connected state of the discontinuous connection DRX mode,

The mobility management entity sends a second indication message to the serving gateway to indicate that the target UE can receive downlink data, including:

The mobility management entity sends a first request message for requesting the radio access network node to notify the target UE to stop the DRX mode to the radio access network node accessed by the target UE;

Receiving, by the mobility management entity, a first acknowledgement message sent by the radio access network node to indicate that the target UE has stopped the DRX mode;

The mobility management entity determines, according to the first acknowledgement message, that the target UE can receive downlink data, and sends the second indication message to the serving gateway.

With reference to the fourth implementation manner of the second aspect, in a sixth implementation manner of the second aspect, the mobility management entity sends, to the serving gateway, a second indication message that is used to indicate that the target UE can receive downlink data, including :

When the mobility management entity receives the handover signaling sent by the radio access network node in the S1 interface-based handover procedure, determining that the target UE can receive downlink data, and sending the second indication message to the serving gateway .

With reference to the fourth implementation manner of the second aspect, in a seventh implementation manner of the second aspect, the mobility management entity sends, to the serving gateway, a second indication message that is used to indicate that the target UE can receive downlink data, including :

The mobility management entity sends a second request message for requesting the target UE to receive time information of the downlink data to the radio access network node accessed by the target UE;

Receiving, by the mobility management entity, a second acknowledgement message sent by the radio access network node that includes time information that the target UE can receive downlink data;

The mobility management entity sends, according to the second acknowledgement message, the second indication message that includes the time information that the target UE can receive the downlink data, so that the serving gateway determines that the target UE can receive the downlink data. And sending the buffered downlink data of the target UE to the target UE.

With reference to the seventh implementation manner of the second aspect, in an eighth implementation manner of the second aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

With reference to the second aspect, or any one of the first to the third implementation manners of the second aspect, in a ninth implementation manner of the second aspect, the first indication message further includes the target UE The time information of the downlink data can be received, so that the serving gateway sends the downlink data to the target UE if the target UE can receive the downlink data.

With reference to the ninth implementation manner of the second aspect, in the tenth implementation manner of the second aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

With reference to the second aspect and the foregoing implementation manner, in an eleventh implementation manner of the second aspect, the method further includes:

The mobility management entity receives a downlink data notification message that is sent by the serving gateway to indicate downlink data arrival of the target UE when receiving downlink data of the target UE.

A third aspect provides a method of processing downlink data, the method comprising:

The radio access network node determines that the target user equipment UE is not capable of receiving downlink data;

The radio access network node sends a first indication message to the serving gateway to indicate that the target UE is unable to receive downlink data by using the mobility management entity, so that the serving gateway caches downlink data of the target UE;

The radio access network node sends, by the mobility management entity, a second indication message to the serving gateway to indicate that the target UE can receive downlink data, so that the serving gateway will be able to receive downlink data when the target UE can receive downlink data. The buffered downlink data of the target UE is sent to the target UE.

With reference to the third aspect, in a first implementation manner of the third aspect, after the radio access network node sends, by the mobility management entity, the first indication message that is used by the mobility management entity to indicate that the target UE is not capable of receiving downlink data, The method further includes:

The radio access network node sends a request message for requesting to buffer downlink data of the target UE to the mobility management entity if it is determined that the radio access network node has insufficient buffer space.

With the third aspect or the first implementation manner of the third aspect, in the second implementation manner of the third aspect, the radio access network node determines that the target user equipment UE is not capable of receiving downlink data, including:

The radio access network node configures the target UE to be in a connected state discontinuous reception DRX mode.

In conjunction with the second implementation of the third aspect, in a third implementation of the third aspect, And transmitting, by the mobility management entity, the second indication message, by the mobility management entity, to the serving gateway, to indicate that the target UE is capable of receiving downlink data, including:

Receiving, by the mobile access network node, a first request message sent by the mobility management entity for requesting to notify the target UE to stop the DRX mode;

The radio access network node notifies the target UE to stop the DRX mode, and if it is determined that the target UE stops the DRX mode, sends the second indication message to the mobility management entity to indicate that the target UE has stopped the DRX mode. In order for the mobility management entity to inform the serving gateway that the target UE can receive downlink data.

In conjunction with the second implementation of the third aspect, in a fourth implementation manner of the third aspect, the radio access network node sends, by the mobility management entity, the serving gateway, to indicate that the target UE can receive downlink data. The second indication message includes:

Receiving, by the radio access network node, a second request message sent by the mobility management entity for requesting time information that the target UE can receive downlink data;

Transmitting, by the radio access network node, the second indication message that includes time information that the target UE can receive downlink data, to the mobility management entity, to enable the mobility management entity to send the time information to the serving gateway, so as to facilitate the The serving gateway sends downlink data to the target UE if the target UE can receive downlink data.

With reference to the fourth implementation manner of the third aspect, in a fifth implementation manner of the third aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

A fourth aspect provides an apparatus for processing downlink data, the apparatus comprising:

a receiving module, configured to receive a first indication message that is sent by the mobility management entity to indicate that the target user equipment UE is not capable of receiving downlink data;

a buffering module, configured to cache downlink data of the target UE when receiving downlink data of the target UE indicated by the first indication message received by the receiving module;

And a sending module, configured to send downlink data of the target UE buffered by the cache module to the target UE, if the target UE is configured to receive downlink data.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the receiving module is specifically configured to: receive, by the mobility management entity, a cache space of a radio access network node that is determined by the target UE to be insufficient In the case, the first indication message is sent.

In combination with the fourth aspect or the first possible implementation of the fourth aspect, the second aspect of the fourth aspect In a possible implementation, the receiving module is specifically configured to receive the first indication message sent by the mobility management entity, where the first indication message is sent by the mobility management entity based on the radio access network node. A message indicating that the target UE is in a connected state discontinuous reception DRX mode is sent to the serving gateway.

With reference to the fourth aspect and the foregoing implementation manner, in a third implementation manner of the fourth aspect, the sending module includes:

a first receiving unit, configured to receive a second indication message that is sent by the mobility management entity to indicate that the target UE is capable of receiving downlink data, where the second indication message is sent by the mobility management entity based on the radio access network node And the second indication message is that the mobility management entity receives the radio access network node in a handover procedure based on an S1 interface, to send a message indicating that the target UE can receive downlink data. Transmitted to the service gateway in the case of the transmitted handover signaling;

The first sending unit is configured to determine, according to the second indication message received by the first receiving unit, that the target UE can receive downlink data, and send the cached downlink data of the target UE to the target UE.

With the fourth aspect or the first or second implementation manner of the fourth aspect, in a fourth implementation manner of the fourth aspect, the sending module includes:

a second receiving unit, configured to receive a third indication message that is sent by the mobility management entity to indicate time information that the target UE can receive downlink data;

a first determining unit, configured to determine, according to the third indication message received by the second receiving unit, a time at which the target UE can receive downlink data;

And a second sending unit, configured to send, by the first determining unit, the downlink data of the target UE that is buffered to the target UE.

With reference to the fourth implementation manner of the fourth aspect, in a fifth implementation manner of the fourth aspect, the third indication message includes discontinuous received DRX information of the target UE.

With reference to the fourth aspect, or the first or the second implementation manner of the fourth aspect, in the sixth implementation manner of the fourth aspect, the first indication message further includes time information that the target UE can receive the downlink data;

The sending module includes:

a second determining unit, configured to determine, according to time information that the target UE can receive downlink data, a time at which the target UE can receive downlink data;

And a third sending unit, configured to send the buffered downlink data of the target UE to the target UE at a time when the target UE that is determined by the second determining unit is capable of receiving downlink data.

With reference to the first or sixth implementation manner of the fourth aspect, in a seventh implementation manner of the fourth aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

With reference to the fourth aspect or the first or second implementation manner of the fourth aspect, in the eighth implementation manner of the fourth aspect, the sending module is specifically configured to: when receiving, in an S1 interface-based switching process, When the indirect data forwarding tunnel request is sent by the mobility management entity, it is determined that the target UE can receive downlink data, and send the cached downlink data of the target UE to the target UE.

With reference to the fourth aspect and the foregoing implementation manner, in a ninth implementation manner of the fourth aspect, the sending module is further configured to: when receiving the downlink data of the target UE indicated by the first indication message, The mobility management entity sends a downlink data notification message indicating the arrival of downlink data of the target UE.

A fifth aspect provides an apparatus for processing downlink data, the apparatus comprising:

a determining module, configured to determine that the target user equipment UE is not capable of receiving downlink data;

The first sending module is configured to send, to the serving gateway, a first indication message that is used by the determining, by the determining module, that the target UE is not capable of receiving downlink data, so that the serving gateway caches downlink data of the target UE.

With reference to the fifth aspect, in a first implementation manner of the fifth aspect, the first sending module is specifically configured to: when the buffer of the radio access network node accessed by the target UE is insufficient, send the The first indication message.

With reference to the first implementation manner of the fifth aspect, in a second implementation manner of the fifth aspect, the first sending module includes:

a first receiving unit, configured to receive a request message sent by the radio access network node for requesting to buffer downlink data of the target UE, where the request message is that the radio access network node determines the radio access network node Sent to the mobility management entity when the cache space is insufficient;

The first sending unit is configured to send the first indication message to the serving gateway according to the request message received by the first receiving unit.

With reference to the above implementation manner of the fifth aspect, in a third implementation manner of the fifth aspect, the determining module includes:

a second receiving unit, configured to receive, by the radio access network node accessed by the target UE, And indication information indicating a discontinuous reception DRX mode in which the target UE is in a connected state;

And a determining unit, configured to determine, according to the indication information received by the second receiving unit, that the target UE is unable to receive downlink data.

With reference to the fifth aspect and the foregoing implementation manner, in a fourth implementation manner of the fifth aspect, the device further includes:

a second sending module, configured to send, to the serving gateway, a second indication message that is used to indicate that the target UE can receive downlink data, so that the serving gateway will cache the target UE if the target UE can receive downlink data. The downlink data is sent to the target UE.

With reference to the fourth implementation manner of the fifth aspect, in a fifth implementation manner of the fifth aspect, the target UE is in a disconnected DRX mode in a connected state,

The second sending module includes:

a first sending unit, configured to send, to a radio access network node that is accessed by the target UE, a first request message for requesting the radio access network node to notify the target UE to stop the DRX mode;

a first receiving unit, configured to receive a first acknowledgement message sent by the radio access network node to indicate that the target UE has stopped the DRX mode;

The first sending unit is further configured to: according to the first acknowledgement message, determine that the target UE is capable of receiving downlink data, and send the second indication message to the serving gateway.

With reference to the fourth implementation manner of the fifth aspect, in a sixth implementation manner of the fifth aspect, the second sending module is specifically configured to: when the S1 interface-based handover procedure, receive the radio access network node When the handover signaling is sent, it is determined that the target UE can receive downlink data, and send the second indication message to the serving gateway.

With reference to the fourth implementation manner of the fifth aspect, in a seventh implementation manner of the fifth aspect, the second sending module includes:

a second sending unit, configured to send, to the radio access network node accessed by the target UE, a second request message for requesting that the target UE can receive time information of downlink data;

a second receiving unit, configured to receive, by the radio access network node, a second acknowledgement message that includes time information that the target UE can receive downlink data;

The second sending unit is further configured to: send, according to the second acknowledgement message, the second indication message that includes time information that the target UE can receive downlink data, to enable the serving gateway to determine that the target UE can receive At the moment of downlink data, and sending the buffered downlink data of the target UE to the target UE.

With reference to the seventh implementation manner of the fifth aspect, in the eighth implementation manner of the fifth aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

With reference to the fifth aspect or the first to third implementation manners of the fifth aspect, in a ninth implementation manner of the fifth aspect, the first indication message further includes time information that the target UE can receive downlink data, so that The serving gateway sends downlink data to the target UE if the target UE can receive downlink data.

With reference to the ninth implementation manner of the fifth aspect, in the tenth implementation manner of the fifth aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

With reference to the fifth aspect and the foregoing implementation manner, in the eleventh implementation manner of the fifth aspect, the device further includes:

The receiving module is configured to receive a downlink data notification message that is sent by the serving gateway to indicate downlink data arrival of the target UE when receiving the downlink data of the target UE.

A sixth aspect provides an apparatus for processing downlink data, the apparatus comprising:

a first sending module, configured to send, by the mobility management entity, a first indication message that is used by the mobility management entity to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway caches downlink data of the target UE;

a second sending module, configured to send, by the mobility management entity, a second indication message to the serving gateway, indicating that the target UE can receive downlink data, so that the serving gateway can receive downlink data in the target UE. The buffered downlink data of the target UE is sent to the target UE.

With reference to the sixth aspect, in a first implementation manner of the sixth aspect, the device further includes:

And a third sending module, configured to send, to the mobility management entity, a request message for requesting to buffer downlink data of the target UE, if the buffer space of the radio access network node is insufficient.

With reference to the sixth aspect, or the first implementation manner of the sixth aspect, in the second implementation manner of the sixth aspect, the determining module is specifically configured to configure the target UE to be in a connected state discontinuous reception DRX mode.

In conjunction with the second implementation of the sixth aspect, in a third implementation manner of the sixth aspect, The second sending module includes:

a first receiving unit, configured to receive a first request message sent by the mobility management entity for requesting to notify the target UE to stop the DRX mode;

a first sending unit, configured to notify the target UE to stop the DRX mode, and, if it is determined that the target UE stops the DRX mode, send the second indication to the mobility management entity to indicate that the target UE has stopped the DRX mode a message, so that the mobility management entity informs the serving gateway that the target UE can receive downlink data.

With reference to the second implementation manner of the sixth aspect, in a fourth implementation manner of the sixth aspect, the second sending module includes:

a second receiving unit, configured to receive a second request message that is sent by the mobility management entity to request time information that the target UE can receive downlink data;

a second sending unit, configured to send, to the mobility management entity, the second indication message that includes time information that the target UE can receive downlink data, so that the mobility management entity sends the time information to the serving gateway, so as to facilitate The serving gateway sends downlink data to the target UE if the target UE is capable of receiving downlink data.

With reference to the fourth implementation manner of the sixth aspect, in a fifth implementation manner of the sixth aspect, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

Based on the foregoing technical solution, in the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, the downlink data of the target UE is buffered by the core network node serving gateway, which is effective compared with the prior art. The problem that the radio access network node accessed by the UE caches the performance degradation caused by the downlink data of the UE and the possible packet loss may be avoided, thereby improving the reliability of transmitting the downlink data.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, other drawings may be obtained from those skilled in the art without any inventive labor.

FIG. 1 is a schematic flowchart of a method for processing downlink data according to an embodiment of the present invention.

FIG. 2 is another schematic flowchart of a method for processing downlink data according to an embodiment of the present invention.

FIG. 3 is a schematic flowchart of a S1 interface-based handover procedure according to an embodiment of the present invention.

FIG. 4 is still another schematic flowchart of a method for processing downlink data according to an embodiment of the present invention.

FIG. 5 is still another schematic flowchart of a method for processing downlink data according to an embodiment of the present invention.

FIG. 6 is still another schematic flowchart of a method for processing downlink data according to an embodiment of the present invention.

FIG. 7 is a schematic flowchart of a method for processing downlink data according to another embodiment of the present invention.

FIG. 8 is a schematic flowchart of a method for processing downlink data according to another embodiment of the present invention.

FIG. 9 is a schematic block diagram of an apparatus for processing downlink data according to an embodiment of the present invention.

FIG. 10 is a schematic block diagram of an apparatus for processing downlink data according to another embodiment of the present invention.

FIG. 11 is a schematic block diagram of an apparatus for processing downlink data according to still another embodiment of the present invention.

FIG. 12 shows a schematic block diagram of a service gateway provided in accordance with an embodiment of the present invention.

FIG. 13 shows a schematic block diagram of a mobility management entity provided in accordance with an embodiment of the present invention.

FIG. 14 shows a schematic block diagram of a radio access network node according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be understood that the technical solution of the present invention can be applied to an Evolved Packet System ("EPS"), and can also be applied to other various communication systems, for example, global migration. Global System of Mobile communication ("GSM") system, Code Division Multiple Access ("CDMA") system, Wideband Code Division Multiple Access ("Wideband Code Division Multiple Access") WCDMA") system, General Packet Radio Service ("GPRS"), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (referred to as "Frequency Division Duplex") FDD") system, LTE Time Division Duplex ("TDD"), Universal Mobile Telecommunication System (UMTS), and the like.

It should also be understood that in the embodiment of the present invention, a user equipment (User Equipment, referred to as "UE") may also be referred to as a terminal, a mobile terminal (Mobile Terminal), a mobile station (Mobile Station, abbreviated as "MS"), and the like. . The user equipment UE can communicate with one or more core networks via a Radio Access Network (Radio Access Network, hereinafter referred to as "RAN"). Specifically, for example, the user equipment UE may be a mobile phone (or "cellular" phone), a computer with a mobile terminal, and may also be a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device, which The radio access network RAN exchanges languages and/or data. In addition, the user equipment UE may also be an MTC device such as a sensor. In addition, in the embodiment of the present invention, the mobile device UE may also be a mobile relay device, such as an access point (AP).

It should also be understood that, in the embodiment of the present invention, the radio access network RAN node may specifically be a base station, and the base station may be an evolved base station (Evolutional Node B, referred to as “eNB or e-NodeB”) in LTE. It may be a base station in GSM (Base Transceiver Station, abbreviated as "BTS"), and may also be a base station (NodeB, abbreviated as "NB") in WCDMA. The embodiment of the present invention is not limited, but for convenience of description, the following The embodiment will be described by taking an eNB as an example.

First, the network element device mainly involved in the embodiment of the present invention is introduced:

1) A mobility management entity (e.g., MME): supports functions related to processing downlink data of a UE in a connected state DRX, including providing information such as UE reachability (whether or not downlink data can be received) to the S-GW, and requesting the RAN side node Information about DRX, etc.

2) A serving gateway (for example, S-GW): supports functions related to processing downlink data of a UE in a connected state DRX, including marking the reachability of the UE according to the MME indication, and buffering and transmitting the downlink data packet.

3) Radio access network node (such as RAN): support and processing in the connected state DRX The downlink data related function of the UE includes: indicating, by signaling, that the UE leaves the connected state DRX, providing the MME with the cache usage status, the connected state DRX information, and the like.

FIG. 1 shows a method 100 for processing downlink data according to an embodiment of the present invention. The method 100 is performed, for example, by a service gateway. As shown in FIG. 1, the method 100 includes:

S110. The serving gateway receives a first indication message that is sent by the mobility management entity and is used to indicate that the target user equipment UE is not capable of receiving downlink data.

S120. The serving gateway caches downlink data of the target UE when receiving downlink data of the target UE.

S130. The serving gateway sends the cached downlink data of the target UE to the target UE if it is determined that the target UE can receive downlink data.

In the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, the core network node serving gateway caches the downlink data of the target UE, and it should be understood that the serving gateway is relative to the radio access network node ( In particular, small base stations with limited buffer space have large cache space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

Specifically, for example, the mobility management entity involved in the embodiment of the present invention is an MME, the serving gateway is an S-GW, and the radio access network node is a RAN node.

It should be understood that, in the embodiment of the present invention, the target UE may be one or more UEs that cannot receive downlink data. Specifically, for example, the target UE is one or more UEs configured to be discontinuously receiving DRX mode in a connected state.

Optionally, in the embodiment of the present invention, the S110 receives the first indication message that is sent by the mobility management entity to indicate that the target user equipment UE is not capable of receiving the downlink data, and includes:

The serving gateway receives the first indication message sent by the mobility management entity, where the first indication message is sent by the mobility management entity based on the radio access network node accessed by the target UE to indicate that the target UE is in the connection. The message is sent to the serving gateway without receiving the DRX mode message continuously.

Specifically, the target UE is configured as Connected-Discontinuous Reception (C-DRX), that is, the discontinuous reception of the target UE in the connected state. (DRX), that is, the target UE opens the receiver into the activation period only for a certain period of time to receive downlink data and signaling, and turns off the receiver to enter the sleep period at other time periods, and stops receiving downlink data and signaling.

Specifically, in S110, the first indication message includes an identifier of a target UE that cannot receive downlink data. The serving gateway saves the identifiers of the target UEs that are unable to receive downlink data.

In the embodiment of the present invention, when the downlink data of the target UE in the connected state DRX (C-DRX) arrives, the core network node, that is, the serving gateway S-GW, is used to buffer the downlink data of the target UE, and it should be understood that S Compared with the radio access network RAN node (especially the small base station with limited buffer space), the GW has a larger buffer space and better data buffering performance. Therefore, the embodiment of the present invention can effectively avoid the RAN node compared with the prior art. The problem of performance degradation caused by buffering downlink data of the UE, and the problem of packet loss that may occur.

It should be understood that the target UE in the embodiment of the present invention may also be a UE that is configured as an extended Connected-Discontinuous Reception (eC-DRX), which is not limited in the embodiment of the present invention. As long as the target UE is in the DRX mode of operation in the connected state.

Therefore, the method for processing downlink data according to the embodiment of the present invention may be applied to a scenario in which a user equipment configured to connect discontinuous reception (C-DRX) has downlink data arrival, and may also be applied to a connection state configured to be extended. The user equipment of discontinuous reception (eC-DRX) has a scenario when downlink data arrives.

It should be understood that the target UE involved in the embodiment of the present invention may be, but is not limited to, a UE in a connected state discontinuous reception RDX mode, and optionally, a UE in another connected state unreachable mode, the present invention The embodiment does not limit this.

In S120, specifically, when the downlink data of the UE arrives, the serving gateway determines, by the identifier of the UE, whether the UE is a target UE that cannot receive downlink data, and if yes, buffers downlink data of the target UE.

Further, when receiving the downlink data of the target UE, the serving gateway may send a downlink data notification message to the mobility management entity to notify the mobility management entity that the downlink data of the target UE has been released, so that the mobility management entity can perform further actions. For example, the UE can receive related information of the downlink data, and instruct the serving gateway to send the cached data and the like.

Optionally, in the embodiment of the present invention, the method 100 further includes:

S140. When receiving the downlink data of the target UE indicated by the first indication message, the serving gateway sends a downlink data notification message indicating that the downlink data of the target UE arrives to the mobility management entity.

It should be understood that, in the embodiment of the present invention, the serving gateway may start to buffer the downlink data of the target UE when receiving the downlink data of the target UE, or may also after receiving the downlink data notification acknowledgement message sent by the mobility management entity. The cache is started, which is not limited by the embodiment of the present invention.

Optionally, in the embodiment of the present invention, when the serving gateway receives the downlink data of the target UE, the S12 caches the downlink data of the target UE, including:

S121. When receiving the downlink data of the target UE indicated by the first indication message, the serving gateway sends a downlink data notification message indicating that the downlink data of the target UE arrives to the mobility management entity.

S122. The serving gateway receives the downlink data notification acknowledgement message sent by the mobility management entity, and buffers downlink data of the target UE.

Specifically, taking the RAN node as an eNB as an example, FIG. 2 is another schematic flowchart of a method for processing downlink data according to an embodiment of the present invention.

S201: When the eNB configures the UE in the connected state DRX (ie, C-DRX) mode, the eNB provides indication information indicating that the UE is configured to be in the C-DRX mode, and the MME saves the indication information.

S202. After the eNB buffer space occupancy reaches a certain threshold, the eNB sends an S1-AP message to the MME, where the S1-AP message is used to request the core network node to buffer downlink data of the UE configured as C-DRX.

S203. After receiving the S1-AP message of the downlink data of the UE, the MME sends a UE reachability indication message to the S-GW, where the UE reachability indication message includes the identifier of the UE configured as C-DRX. .

S204. The S-GW marks the UE(s) configured as C-DRX as "temporary unreachable".

S205: The S-GW receives the downlink data of the UE. If the UE corresponding to the downlink data of the UE is marked as “temporarily unreachable”, the S-GW sends a downlink data notification (Dowlink Data Notification, referred to as “the short message”). DDN") message, the DDN message carries the identity of the UE.

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

S206. The MME sends a downlink data notification confirmation to the S-GW (Dowlink Data Notification). Acknowledgement (abbreviated as "DDNA") message is used to inform the S-GW that the downlink data of the UE needs to be buffered.

It should be understood that the UE reachability indication message mentioned in the embodiment of the present invention refers to an indication message for indicating whether the UE can receive downlink data. It should be understood that UE reachability means that the UE can receive downlink data and signaling, and UE unreachability means that the UE cannot receive downlink data and signaling.

In the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, for example, when the downlink data of the target UE in the connected state DRX (C-DRX) arrives, the RAN node corresponding to the target UE When the buffer space is insufficient, the downlink data of the target UE is buffered by the S-GW. In other words, in the embodiment of the present invention, in the case that the RAN node buffer space of the target UE is sufficient, the downlink data of the target UE is buffered according to a conventional scheme. When the buffer space of the RAN node is insufficient, the downlink data of the target UE is cached by the core network node serving gateway, that is, the method for processing downlink data according to the embodiment of the present invention can be compatible with the prior art, thereby being more flexible. The downlink data of the target UE is cached.

Therefore, according to the method for processing downlink data provided by the embodiment of the present invention, on the one hand, a storage location for buffering downlink data of the target UE is added to the RAN node, which can effectively reduce downlink data of the system as a whole to cache the UE. On the other hand, the service gateway has a larger buffer space and better data cache performance than the radio access network node (especially a small base station with limited buffer space), for example, even if the target UE has a sleep period of minutes. , there will be no easy problem with insufficient cache space. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

Specifically, the serving gateway may receive the first indication message sent by the mobility management entity if the buffer space of the radio access network node accessed by the target UE is insufficient.

Optionally, in the embodiment of the present invention, the S120 receives the first indication message that is sent by the mobility management entity to indicate that the target user equipment UE is not capable of receiving the downlink data, and includes:

Receiving, by the serving gateway, the first indication message that is sent by the mobility management entity, when receiving, by the radio access network node that is accessed by the target UE, a request message for requesting to buffer downlink data of the target UE, where The request message is sent by the radio access network node to the mobility management entity when it determines that the buffer space of the radio access network node is insufficient.

Specifically, for example, when the LUN of the RAN node accessed by the target UE is insufficient, the RAN The node sends a request message for requesting the downlink data of the target UE to the MME, and the MME sends a first message to the S-GW to indicate that the target UE cannot receive the downlink data (also referred to as unreachable) according to the request message. Indicate the message.

It should be understood that the insufficient buffer space of the RAN node refers to that the occupation of the buffer space of the RAN node exceeds a preset threshold. For example, when the occupancy of the buffer space of the RAN node exceeds the preset threshold, the buffer performance of the RAN node may be degraded.

It should be understood that the mobility management entity may send the first indication message to the serving gateway when receiving the request message for requesting the buffering downlink data sent by the RAN node of the target UE, or may confirm that the target UE cannot receive the downlink data. The first indication message is directly sent to the serving gateway, which is not limited by the embodiment of the present invention.

In S130, the serving gateway sends the downlink data of the target UE buffered in the foregoing S120 to the target UE, if it is determined that the target UE can receive the downlink data. Specifically, the S-GW may determine, by using the indication message sent by the MME, that the target UE can receive downlink data, so as to send the buffered downlink data of the target UE to the target UE, or may be based on the RDX of the target UE. The information is used to determine the time at which the target UE can receive the downlink data, and send the buffered downlink data of the target UE to the target UE at the moment. In addition, when the target UE is in the S1 interface-based handover process between the source base station and the target base station (it should be understood that the target UE is necessarily capable of receiving downlink data during handover), the S-GW may also send the buffer to the target UE. Downlink data of the target UE.

Optionally, in the embodiment of the present invention, the S130, in the case that the target UE is configured to receive the downlink data, sends the cached downlink data of the target UE to the target UE, including:

S131. The serving gateway receives a second indication message that is sent by the mobility management entity to indicate that the target UE is capable of receiving downlink data.

Specifically, the second indication message is sent by the mobility management entity to the serving gateway based on a message sent by the radio access network node to indicate that the target UE can receive downlink data, or the second indication message The mobility management entity sends the handover signaling sent by the radio access network node to the serving gateway in the handover procedure based on the S1 interface.

S132. The serving gateway determines, according to the second indication message, that the target UE is capable of receiving downlink data, and sends the cached downlink data of the target UE to the target UE.

Specifically, the second indication message indicates that the target UE is capable of receiving downlink data, that is, the UE is reachable. The second indication message may also be referred to as a UE reachability indication message.

Specifically, as shown in FIG. 2, the RAN node is taken as an eNB as an example.

S204. The S-GW marks the UE(s) configured as C-DRX as "temporary unreachable".

S205. The S-GW receives the downlink data of the UE, and determines that the UE corresponding to the downlink data of the UE is The S-GW sends a Down Data Report (DDN) message to the MME, and the DDN message carries the identifier of the UE.

S206. The MME sends a Downlink Data Notification Acknowledgement (DDNA) message to the S-GW to notify the S-GW that the downlink data of the UE needs to be buffered.

S207. The S-GW buffers downlink data of the UE.

S208. The MME requests the eNB to notify the UE to stop the DRX mode to receive downlink data by using an S1-AP message.

S209. The eNB requests the UE to stop the DRX mode by signaling.

S210. After the UE stops the DRX mode from becoming reachable, the eNB sends an S1-AP message to inform the MME that the UE has stopped the DRX mode from becoming reachable.

S211. The MME sends a UE reachability indication message indicating that the UE is reachable to the S-GW, where the UE reachability indication message includes an identifier of the UE.

It should be understood that the second indication message in the embodiment of the present invention corresponds to the UE reachability indication message in S211 for indicating that the UE is reachable.

S212. The S-GW marks the UE identified by the UE, that is, the UE(s) that stops the DRX mode, as “reachable”.

S231. The S-GW sends the buffered downlink data to the UE. It should be understood that, as shown in FIG. 2, the S-GW sends the buffered downlink data to the eNB of the UE, and then the eNB forwards the buffered downlink data to the UE, and the related operations are prior art, and details are not described herein again. .

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication information to the S-GW, and informs the S-GW that the S-GW should cache the Downlink data of the UE. Therefore, in the embodiment of the present invention, the core network node (the MME and the S-GW) may cache the downlink data of the UE configured to be connected to the DRX when the LUN node has insufficient buffer space, which may prevent the RAN node from buffering the downlink data. Performance degradation and possible packet loss. In addition, the MME requests the eNB to inform the UE to stop eC-DRX to receive downlink data. After the UE stops the eC-DRX from being reachable, the MME indicates to the S-GW that the UE is reachable, and the S-GW sends the buffered data packet to the UE, thereby realizing that the UE is reachable, that is, capable of receiving downlink data. And sending the downlink data of the UE buffered in the S-GW to the downlink data in time The UE can improve the transmission efficiency of the downlink data of the UE, and also release the occupation of the buffer space of the S-GW by the downlink data of the UE.

In the embodiment above with reference to FIG. 2, in the case that the MME notifies the S-GW to buffer the downlink data of the UE, the MME requests the RAN side node to stop the eC-DRX to receive downlink data, and learns that the UE stops eC. - DRX, that is, when the downlink data can be received, the MME sends an indication message indicating that the UE can receive the downlink data to the S-GW, and the S-GW sends the corresponding cache to the UE according to the indication message of the MME. Downstream data. Optionally, in the embodiment of the present invention, the MME may also use other means to determine that the target UE can receive downlink data, for example, when the UE moves from the source eNB to the target eNB, for example, in an S1 interface-based handover procedure, After receiving the handover signaling sent by the source eNB, the MME can also determine that the target UE is reachable, that is, can receive downlink data.

The following briefly introduces the switching process based on the S1 interface.

The internal handover of the evolved universal land-based radio access network E-UTRAN can be divided into two according to whether the MME changes, one of which is switching between the source eNB and the target eNB under the control of the same MME, and the other is related to The MME changes the handover. According to different switching interfaces, the internal switching of E-UTRAN can also be divided into two types, one is switching based on X2 interface, and the other is switching based on S1 interface, wherein in switching based on X2 interface, switching The preparation process of the resource is performed by the X2 interface between the source eNB and the target eNB. In the S1 interface-based handover, the preparation process of the handover resource is performed through the S1 interface between the eNB and the MME.

When the MME is unchanged, both the X2 interface-based handover and the S1 interface-based handover can be performed. When the MME changes, only the S1 interface based handover can be performed. When the S-GW is changed, if there is no Internet Protocol (IP) connectivity between the source S-GW and the target eNB, only the S1 interface-based handover can be performed.

The switching process based on the S1 interface is as shown in Figure 3 below:

S301: The source eNB decides to initiate a handover based on the S1 interface.

S302: The source eNB sends a handover request message to the source MME, where the message includes a direct forwarding path validity, a source-to-destination transparent transmission unit, a target eNB identifier, a target TAI identifier, a target TAI, and an S1AP cause value.

S303: The source MME determines that the MME serving the UE needs to be reselected, and sends a forward relocation request to the target MME.

S304: The target MME determines whether it is necessary to reselect the S-GW serving the UE. If needed To reselect, the target MME sends a create session request message (including P-GW low value and TEID) to the target S-GW. The target S-GW returns a create session response to the MME, including the S-GW address and TEID for the user plane.

S305: The target MME sends a handover request message to the target eNB, where the message includes an EPS bearer, an AMBR, an S1AP cause, a source-to-target transparent transmission unit, and a handover restriction list to be established. The target eNB sends a handover request acknowledgement message to the target MME.

S306: If indirect forwarding is used and the S-GW is relocated, the target MME establishes a forwarding parameter, and sends an indirect data forwarding tunnel request message to the target S-GW, which includes the cause and the target for forwarding. eNB address and TEID.

S307: If the MME is relocated, the target MME sends a forward relocation response message to the source MME. If an indirect tunnel is used, this message also contains the S-GW address and TEID for indirect forwarding.

S308: If indirect forwarding is applied, the source MME sends an indirect data forwarding tunnel request to the source S-GW, including the reason and the address and TEID used for forwarding. The source S-GW sends an indirect data forwarding tunnel response message to the source MME, including the S-GW address and the TEID used for forwarding.

S309: The source MME sends a handover command message to the source eNB, where the target to source transparent transmission unit, the bearer to be forwarded, and the bearer to be released are included.

S310: The source eNB sends an eNB status transmission message to the target eNB via the MME.

S311: The source eNB may start forwarding the downlink data of those bearers that need to be forwarded. Data forwarding can be achieved by direct (S311a) or indirect (S311b).

S312: After successfully synchronizing to the target cell, the UE sends a handover confirmation message to the target eNB. At this time, the downlink data forwarded from the source eNB may be sent to the UE, and the uplink data of the UE may also be sent and sent to the P-GW via the S-GW.

The subsequent processes are mainly the process of modifying the bearer and releasing the resources, and are not described in detail here.

It should be understood that the S1 interface-based handover procedure is only briefly described above with reference to FIG. 3. For detailed procedure, please refer to section 5.5.1.2.2 of 3GPP TS 23.401.

Optionally, in the embodiment of the present invention, when the MME receives the handover signaling sent by the source radio access network RAN node of the target UE in the S1 interface-based handover procedure of the target UE, determining the target The UE can receive downlink data and send the second indication message to the S-GW.

Specifically, taking the RAN node as an eNB as an example, FIG. 4 is another schematic block diagram of a method for processing downlink data according to an embodiment of the present invention.

S401: When the source eNB configures the UE to be in a connected state DRX (ie, C-DRX) mode, the source eNB provides indication information indicating that the UE is configured to be in the C-DRX mode, and the source MME saves the indication information.

S402, after the source eNB buffer space occupancy reaches a certain threshold, the source eNB sends an S1-AP message to the source MME, where the S1-AP message is used to request the core network node to buffer the downlink data of the UE configured as C-DRX. .

S403. After receiving the S1-AP message of the source eNB requesting to buffer the downlink data of the UE, the source MME sends a UE reachability indication message to the source S-GW, where the UE reachability indication message is configured to be configured as C-DRX. The identity of the UE.

S404. The source S-GW marks the UE(s) configured as C-DRX as "temporary unreachable".

S405: The source S-GW receives the downlink data of the UE. If the UE corresponding to the downlink data of the UE is marked as “temporarily unreachable”, the source S-GW sends a downlink data notification (Dowlink Data Notification, Referred to as a "DDN" message, the DDN message carries the identifier of the UE.

S406. The source MME sends a Down Data Notification Acknowledgement (DDNA) message to the source S-GW to notify the source S-GW that the downlink data of the UE needs to be buffered.

S407. The source S-GW buffers downlink data of the UE.

S408. The source eNB finds that the UE has moved to the target eNB, and decides to initiate a handover based on the S1 interface.

S409. The UE and the network perform a handover process based on the S1 interface.

Specifically, as shown in the flow shown in FIG. 3, or step 2 to step 10 in section 5.5.1.2.2 of 3GPP TS 23.401.

S410, after the source MME (corresponding to the MME in the embodiment of the present invention) receives the eNB state transmission message sent by the source eNB in the S1 interface-based handover procedure step 10 shown in FIG. 3, determining that the UE is reachable. That is, it can receive downlink data.

Specifically, corresponding to the S301 shown in FIG. 3, the source eNB sends an eNB status transmission message to the target eNB via the MME, where the status transmission message indicates that the UE is capable of receiving The ability to row data.

S411: The source MME sends a UE reachability indication message to the source S-GW, indicating that the UE is reachable, and the UE reachability indication message further includes the identifier of the UE.

It should be understood that the second indication message in the embodiment of the present invention may correspond to the UE reachability indication message in S411 for indicating that the UE is reachable.

S412. After receiving the indication message of the source MME, the source S-GW marks the UE as “reachable”.

S413: The source S-GW sends the buffered downlink data to the UE.

Specifically, the source S-GW sends the buffered downlink data to the source eNB that serves the UE before the S1 interface-based handover procedure as shown in FIG. 3, and the source eNB directly forwards to the handover process after the handover process ends. The target eNB of the UE, and then the target eNB sends the buffered downlink data to the UE.

It should be understood that, in the embodiment of the present invention, after the source MME sends the DDN ACK message to the source S-GW in S406, the source eNB may also send an S1-AP message to the source eNB, requesting to provide DRX information of the UE, or requesting the source eNB. The UE is informed to stop the DRX mode to receive downlink data (S406a as shown in FIG. 4).

It should be understood that the source MME in the example shown in FIG. 4 corresponds to the mobility management entity in the embodiment of the present invention, and the source S-GW corresponds to the serving gateway in the embodiment of the present invention.

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication information to the S-GW, and informs the S-GW that the S-GW should cache the Downlink data of the UE. Therefore, in the embodiment of the present invention, the core network node (the MME and the S-GW) may cache the downlink data of the UE configured to be connected to the DRX when the LUN node has insufficient buffer space, which may prevent the RAN node from buffering the downlink data. Performance degradation and possible packet loss. In addition, after receiving the handover signaling, the MME sends the UE reachability indication information to the S-GW to notify the UE of the reachability, so that the S-GW sends the buffered downlink data packet to the UE, thereby achieving that the UE is reachable, that is, capable If the downlink data is received, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the downlink data of the UE to the S-GW in time. The occupation of space.

S133. The serving gateway receives the S1 interface-based handover process of the target UE, when receiving When the indirect data forwarding tunnel request is sent by the mobility management entity, it is determined that the target UE can receive downlink data, and send the cached downlink data of the target UE to the target UE.

Specifically, as shown in FIG. 3, when the serving gateway (corresponding to the source S-GW in FIG. 3) receives the indirect data forwarding tunnel request sent by the mobility management entity (corresponding to the source MME in FIG. 3) At the same time (for example, S308 shown in FIG. 3), it is determined that the S1 interface-based handover procedure of the target UE occurs, and it is determined that the target UE can receive downlink data, and then the buffered downlink data of the target UE can be sent to the target UE.

It should be understood that the source MME (corresponding to the MME in the embodiment of the present invention) sends an indirect data forwarding tunnel to the source S-GW (corresponding to the S-GW in the embodiment of the present invention), indicating that the UE has the receiving downlink. The ability of the data, that is, the UE is reachable.

Specifically, taking the RAN node as an eNB as an example, FIG. 5 is another schematic block diagram of a method for processing downlink data according to an embodiment of the present invention.

S501: When the source eNB configures the UE to be in a connected state DRX (ie, C-DRX) mode, the source eNB provides indication information indicating that the UE is configured to be in the C-DRX mode, and the source MME saves the indication information.

S502: After the source eNB buffer space occupancy reaches a certain threshold, the source eNB sends an S1-AP message to the source MME, where the S1-AP message is used to request the core network node to buffer the downlink data of the UE configured as C-DRX. .

S503. After receiving the S1-AP message of the source eNB requesting to buffer the downlink data of the UE, the source MME sends a UE reachability indication message to the source S-GW, where the UE reachability indication message is configured to be configured as C-DRX. The identity of the UE.

S504. The source S-GW marks the UE(s) configured as C-DRX as "temporary unreachable".

S505: The source S-GW receives the downlink data of the UE. If the UE corresponding to the downlink data of the UE is marked as “temporarily unreachable”, the source S-GW sends a downlink data notification (Dowlink Data Notification, Referred to as a "DDN" message, the DDN message carries the identifier of the UE.

S506. The source MME sends a Down Data Notification Acknowledgement (DDNA) message to the source S-GW to notify the source S-GW that the downlink data of the UE needs to be buffered.

S507. The source S-GW buffers downlink data of the UE.

S508. The source eNB finds that the UE has moved to the target eNB, and decides to initiate a handover based on the S1 interface.

S509: The UE and the network perform a handover process based on the S1 interface.

S510: The source S-GW receives the Create Indirect Data Forwarding Tunnel Request sent by the source MME in step S8 of the S1 interface-based handover procedure shown in FIG. 3, and the source S-GW marks the UE as reachable.

S511. The source S-GW forwards the buffered downlink data indirectly through the target S-GW.

Specifically, the source S-GW sends the buffered downlink data to the target S-GW, and the downlink data of the buffer is sent by the target eNB to the target eNB, and the buffered downlink data is sent by the target eNB to the UE. It is understood that after the handover based on the S1 interface is completed, the current serving base station of the UE is the target eNB.

It should be understood that, in the embodiment of the present invention, after the source MME sends the DDN ACK message to the source S-GW in S506, the S1-AP message may also be sent to the source eNB, requesting to provide DRX information of the UE, or requesting the source eNB. The UE is informed to stop the DRX mode to receive downlink data (S506a as shown in FIG. 5).

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication information to the S-GW, and informs the S-GW that the S-GW should cache the Downlink data of the UE. Therefore, in the embodiment of the present invention, the core network node (the MME and the S-GW) may cache the downlink data of the UE configured to be connected to the DRX when the LUN node has insufficient buffer space, which may prevent the RAN node from buffering the downlink data. Performance degradation and possible packet loss. In addition, the S-GW learns that the UE is reachable according to the signaling message received in the S1 interface-based handover procedure, and sends the buffered data packet to the UE in an indirect manner. Therefore, when the UE is reachable, that is, the downlink data can be received, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the timely The occupation of the downlink data of the UE to the buffer space of the S-GW.

The S-GW determines that the target UE can receive downlink data according to the indication message sent by the MME, so as to send downlink data to the target UE. In the embodiment of the present invention, the S-GW may determine, according to the DRX information of the target UE, the time at which the target UE can receive the downlink data, and then send the buffered downlink data to the target UE.

S134. The serving gateway receives a third indication message that is sent by the mobility management entity to indicate time information that the target UE can receive downlink data.

It should be understood that the time information that the target UE can receive downlink data specifically indicates a time or a time period that can indicate that the target UE can receive downlink data, or a time or a time period in which the target UE cannot receive downlink data. In other words, the time information can be used to know when the target UE is capable of receiving downlink data, that is, the UE is reachable, and at which time it is unable to receive downlink data, that is, the UE is unreachable.

S135. The serving gateway determines, according to the third indication message, a time at which the target UE can receive downlink data.

S136. The serving gateway sends the cached downlink data of the target UE to the target UE at a time when the target UE can receive downlink data.

Specifically, the downlink data of the cached target UE is sent to the target UE at a time when the target UE closest to the current time can receive the downlink data.

Specifically, for example, when the target UE is configured to receive the DRX mode discontinuously, the time information that the target UE can receive the downlink data may specifically be the DRX information of the target UE, including but not limited to the DRX cycle information and the absolute For clock reference information, it should be understood that the DRX cycle includes an activation period and a sleep period, and the target UE can receive downlink data during the activation period.

Optionally, in the embodiment of the present invention, the third indication message includes DRX information of the target UE.

Specifically, for example, the DRX information includes a DRX cycle including an activation period and a sleep period, and the target UE can receive downlink data during the activation period.

Specifically, in S135, for example, the time in the activation period of the DRX cycle of the target UE that is closest to the current time is determined as the time at which the target UE can receive the downlink data.

It should be understood that the DRX information of the target UE is requested by the mobility management entity to the radio access network node.

Specifically, taking the RAN node as an eNB as an example, FIG. 6 is another schematic block diagram of a method for processing downlink data according to an embodiment of the present invention.

S601, when the eNB configures the UE into a connected state DRX (ie, C-DRX) mode, the eNB sends an The MME provides indication information indicating that the UE is configured to be in the C-DRX mode, and the MME saves the indication information.

S602. After the eNB buffer space occupancy reaches a certain threshold, the eNB sends an S1-AP message to the MME, where the S1-AP message is used to request the core network node to buffer downlink data of the UE configured as C-DRX.

S603. After receiving the S1-AP message of the eNB requesting to buffer the downlink data of the UE, the MME sends a UE reachability indication message to the S-GW, where the UE reachability indication message includes the identifier of the UE configured as C-DRX. .

S604. The S-GW marks the UE(s) configured as C-DRX as "temporary unreachable".

S605: The S-GW receives the downlink data of the UE. If the UE corresponding to the downlink data of the UE is marked as “temporarily unreachable”, the S-GW sends a downlink data notification (Dowlink Data Notification, referred to as “the short message”). DDN") message, the DDN message carries the identity of the UE.

S606. The MME sends a Downlink Data Notification Acknowledgement (DDNA) message to the S-GW to notify the S-GW that the downlink data of the UE needs to be buffered.

S607. The S-GW buffers downlink data of the UE.

S608. The MME sends an S1-AP message to the eNB, requesting to provide DRX information of the UE.

S609. The eNB sends an S1-AP ACK message to the MME, where the S1-AP ACK message includes DRX information of the UE, including information such as an absolute clock reference and a DRX cycle.

S610. The MME sends a UE reachability indication message to the S-GW, where the DRX information of the UE is included.

S611. The S-GW obtains, according to the DRX information of the UE, a time when the UE becomes reachable, for example, a moment of the activator in the DRX cycle of the UE, and starts a timer T. When the timer expires, the S-GW marks the UE as "reachable."

S612: The S-GW sends the buffered downlink data to the eNB serving the UE. Specifically, the S-GW sends the buffered downlink data to the eNB of the UE, and then the eNB forwards the downlink data to the UE.

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication information to the S-GW, and informs the S-GW that the S-GW should cache the Downlink data of the UE. Therefore, in the embodiment of the present invention, the core The heart network node (MME and S-GW) can buffer the downlink data of the UE configured to be connected to the DRX when the RAN node has insufficient buffer space, and can avoid performance degradation caused by the RAN node buffering downlink data, and possible packet loss. . In addition, the MME requests the eNB to provide the eC-DRX information of the UE, and sends the eC-DRX information of the UE to the S-GW, so that the S-GW obtains the time that the UE converts to reach according to the eC-DRX information of the UE, where When the UE is reachable, the buffered downlink data is sent to the UE. Therefore, when the UE is reachable, that is, the downlink data can be received, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the timely The occupation of the downlink data of the UE to the buffer space of the S-GW.

Therefore, in the embodiment of the present invention, when the downlink data of the target UE in the connected state DRX (C-DRX) arrives, the core network node, that is, the serving gateway S-GW, is used to buffer the downlink data of the target UE, which should be understood. Compared with the RAN node of the radio access network (especially the small base station with limited buffer space), the S-GW has a larger buffer space and better data cache performance. Therefore, the embodiment of the present invention can effectively avoid the The RAN node caches the performance degradation caused by the downlink data of the UE, and the problem of packet loss that may occur.

Optionally, in the embodiment of the present invention, the first indication message further includes time information that the target UE can receive downlink data.

The S130, in the case that the serving UE determines that the target UE can receive the downlink data, sends the cached downlink data of the target UE to the target UE, including:

S137. The serving gateway determines, according to time information that the target UE can receive downlink data, a time at which the target UE can receive downlink data.

It should be understood that the time information that the target UE can receive downlink data specifically indicates a time or a time period that can indicate that the target UE can receive downlink data, or a time or a time period in which the target UE cannot receive downlink data.

S138. The serving gateway sends the cached downlink data of the target UE to the target UE at a time when the target UE can receive downlink data.

It should be understood that, in the first indication information sent by the mobility management entity, the serving gateway acquires time information that the target UE cannot receive the downlink data, and the target UE can receive the downlink data, that is, the first indication message is learned according to the first indication message. During which time periods the target UE can receive downlink data (also referred to as reachability), and during which time periods, downlink data cannot be received (also referred to as unreachable). Therefore, when the downlink data of the target UE arrives, the downlink data is buffered when the target UE is unreachable, and when the target UE is reachable, the downlink data is sent to the target UE.

Specifically, for example, when the target UE is configured to receive the DRX mode discontinuously, the time information that the target UE can receive the downlink data may specifically be the DRX information of the target UE, including but not limited to the DRX cycle information and the absolute Clock reference information.

Optionally, in the embodiment of the present invention, the time information that the target UE can receive the downlink data is the discontinuous reception DRX information of the target UE.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

With reference to FIG. 1 to FIG. 6 , a method for processing downlink data according to an embodiment of the present invention is described in detail from the perspective of a serving gateway, and will be described from the perspective of a mobility management entity in conjunction with FIG. 7 and FIG. 2 to FIG. A method of processing downlink data in an embodiment of the present invention.

FIG. 7 illustrates a method 700 of processing downlink data, the method 700 including:

S710. The mobility management entity determines that the target user equipment UE is not capable of receiving downlink data.

S720. The mobility management entity sends a first indication message to the serving gateway to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway caches downlink data of the target UE.

In the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, the mobility management entity notifies the serving gateway to buffer the downlink data of the target UE, and it should be understood that the serving gateway is relative to the radio access network node (especially It is a small base station with limited buffer space. The cache space is large and the data cache performance is good. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

In S710, specifically, the mobility management entity may be based on the target UE accessing The message that the line access network node sends to indicate that the target UE is not able to receive the downlink data, and determines that the target UE is unreachable; it should be understood that the mobility management entity may determine that the UE is unreachable by other means, not necessarily completely Depending on the reporting message of the radio access network node (for example, the base station), for example, the mobility management entity learns that the target UE is unreachable by using the information sent by the upper-layer system management entity, which is not limited in this embodiment of the present invention.

It should be understood that, in the embodiment of the present invention, the target UE may be one UE or multiple UEs, which is not limited in this embodiment of the present invention.

Optionally, in the embodiment of the present invention, the mobility management entity determines that the target user equipment UE is not capable of receiving downlink data, including:

S711: The mobility management entity receives, by the radio access network node that is accessed by the target UE, indication information that is used to indicate that the target UE is in a connected state in a discontinuous reception DRX mode.

S712. The mobility management entity determines, according to the indication information, that the target UE cannot receive downlink data.

It should be understood that when the target UE is configured in the DRX mode, it is not always in a state capable of receiving downlink data, that is, it is reachable for a period of time, and is unreachable for a period of time. When the mobility management entity learns that the target UE is configured to be in the DRX mode, it is determined that the target UE is not capable of receiving downlink data. Then, the first indication message is sent to the serving gateway to indicate that the target UE is unable to receive the downlink data, so that the serving gateway caches the downlink data of the target UE when the downlink data of the target UE arrives.

When the mobility management entity learns that the downlink data of the target UE is released, that is, the serving gateway receives the downlink data of the target UE, and starts to obtain the specific state of the target UE, whether it is reachable or unreachable, and is reachable. The service gateway is instructed to deliver the buffered downlink data to the target UE.

Specifically, the target UE is configured as a Connected-Discontinuous Reception (C-DRX), that is, a discontinuous reception (DRX) in which the target UE is in a connected state, that is, the target UE only The receiver is turned on during a certain period of time to enter the activation period to receive downlink data and signaling, and the receiver is turned off during other periods to enter the sleep period, and the downlink data and signaling are stopped.

In the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, the mobility management entity notifies the serving gateway to buffer the downlink data of the target UE, and it should be understood that the service Compared with the wireless access network node (especially the small base station with limited buffer space), the gateway has a large buffer space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the cache will not easily occur. The problem of insufficient space. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

Optionally, in the embodiment of the present invention, the S720, the mobility management entity sends, to the serving gateway, a first indication message that is used to indicate that the target UE is incapable of receiving downlink data, and includes:

Optionally, in the embodiment of the present invention, in S720, if the cache of the radio access network node that is accessed by the target UE is insufficient, the mobility management entity sends the first indication message to the serving gateway, including:

S721: The mobility management entity receives a request message sent by the radio access network node for requesting to buffer downlink data of the target UE, where the request message is that the radio access network node determines the radio access network node. Sent to the mobility management entity when the cache space is insufficient;

S722. The mobility management entity sends the first indication message to the serving gateway according to the request message.

Specifically, when the LUN of the RAN node corresponding to the target UE is insufficient, the RAN is The node sends a request message for requesting the downlink data of the target UE to the MME, and the MME sends a first message to the S-GW to indicate that the target UE cannot receive the downlink data (also referred to as unreachable) according to the request message. Indicate the message.

Specifically, as shown in FIG. 2, the detailed description is consistent with the above description, and details are not described herein again.

In the embodiment of the present invention, when the downlink data of the target UE in the connected state DRX (C-DRX) arrives, when the MME determines that the buffer space of the RAN node corresponding to the target UE is insufficient, the S-GW is notified to cache the target UE. Downlink data, so that a storage location for buffering downlink data of the target UE in the connected state DRX is added on the basis of the RAN node, which can effectively reduce the load of the RAN node; on the other hand, the S-GW is connected to the wireless device. Incoming network RAN nodes (especially small base stations with limited buffer space), the buffer space is large, and the data cache performance is also good. Therefore, even if the target UE's sleep period reaches the minute level, the cache will not easily appear. Insufficient problems. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the RAN node buffering the downlink data of the UE, and the problem of packet loss that may occur, compared to the prior art.

It should be understood that the MME may also actively query the RAN node after receiving the DDN message of the S-GW. If the RAN node feedback buffer space exceeds the threshold, the SGW is instructed to buffer the data in the DDN ACK message; if the RAN node feedback does not exceed the threshold, the MME indicates that the SGW does not need to buffer.

It should be understood that, in the embodiment of the present invention, in a case where the target UE can receive downlink data, the serving gateway may send the buffered downlink data to the target UE. The mobility management entity acquires related information that the target UE can receive the downlink data, and then notifies the service gateway, so as to timely deliver downlink data to the target UE.

Optionally, in the embodiment of the present invention, the method 700 further includes:

S730. The mobility management entity sends a second indication message to the serving gateway to indicate that the target UE can receive downlink data, so that the serving gateway will cache the target UE if the target UE can receive downlink data. The downlink data is sent to the target UE. It should be understood that the mobility management entity may send a related indication message if it is determined that the target UE is reachable, or send a related indication message for indicating the reachable time information of the target UE.

Optionally, in the embodiment of the present invention, the target UE is in a disconnected DRX mode in a connected state, and S730, the mobility management entity sends a second indication to the serving gateway to indicate that the target UE can receive downlink data. News, including:

S731: The mobility management entity sends, to the radio access network node accessed by the target UE, a first request message for requesting the radio access network node to notify the target UE to stop the DRX mode;

It should be understood that stopping the DRX mode by the target UE means that the target UE leaves the DRX mode but remains in the connected state.

S732. The mobility management entity receives a first acknowledgement message sent by the radio access network node to indicate that the target UE has stopped the DRX mode.

S733. The mobility management entity determines, according to the first acknowledgement message, that the target UE is capable of receiving downlink data, and sends the second indication message to the serving gateway.

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication signal to the S-GW. Inform the S-GW that the downlink data of the UE should be buffered. Therefore, in the embodiment of the present invention, the core network node (the MME and the S-GW) may cache the downlink data of the UE configured to be connected to the DRX when the LUN node has insufficient buffer space, which may prevent the RAN node from buffering the downlink data. Performance degradation and possible packet loss. In addition, the MME requests the eNB to inform the UE to stop eC-DRX to receive downlink data. After the UE stops the eC-DRX from being reachable, the MME indicates to the S-GW that the UE is reachable, and the S-GW sends the buffered data packet to the UE, thereby realizing that the UE is reachable, that is, capable of receiving downlink data. The downlink data of the UE buffered in the S-GW is sent to the UE in time, and the downlink data transmission efficiency of the UE is improved, and the downlink data of the UE is released in time for the buffer space of the S-GW.

In the foregoing embodiment, in conjunction with the embodiment of FIG. 2, in a case where the MME notifies the S-GW to buffer the downlink data of the UE, the MME requests the RAN side node to stop the DRX mode to receive the downlink data, and learns that the UE stops the DRX mode. In the case that the downlink data can be received, the MME sends an indication message indicating that the UE can receive the downlink data to the S-GW, and the S-GW sends the corresponding buffered downlink data to the UE according to the indication message of the MME. . Optionally, in the embodiment of the present invention, the MME may also use other means to determine that the target UE can receive downlink data, for example, when the UE moves from the source eNB to the target eNB, for example, in an S1 interface-based handover procedure, After receiving the handover signaling sent by the source eNB, the MME can also determine that the target UE is reachable, that is, can receive downlink data.

Optionally, in the embodiment of the present invention, the S730, the mobility management entity sends, to the serving gateway, a second indication message that is used to indicate that the target UE is capable of receiving downlink data, including:

S734, when the mobility management entity receives the handover signaling sent by the radio access network node accessed by the target UE in the S1 interface-based handover procedure of the target UE, determining that the target UE can receive downlink data, And sending the second indication message to the serving gateway.

As shown in FIG. 3, when the mobility management entity (corresponding to the source MME in FIG. 3) receives the handover request message (such as S302 in FIG. 3), it determines that the S1 interface-based handover procedure of the target UE occurs, and then When receiving the handover signaling sent by the radio access network node accessed by the target UE (for example, S310, eNB state transmission message shown in FIG. 3), determining that the target UE can receive downlink data, and to the serving gateway Sending the second indication message.

Specifically, as shown in FIG. 4, the detailed description is consistent with the above description, and details are not described herein again.

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication signal to the S-GW. Inform the S-GW that the downlink data of the UE should be buffered. Therefore, in the embodiment of the present invention, the core network node (the MME and the S-GW) may cache the downlink data of the UE configured to be connected to the DRX when the LUN node has insufficient buffer space, which may prevent the RAN node from buffering the downlink data. Performance degradation and possible packet loss. In addition, after receiving the handover signaling, the MME sends the UE reachability indication information to the S-GW to notify the UE of the reachability, so that the S-GW sends the buffered downlink data packet to the UE, thereby achieving that the UE is reachable, that is, capable If the downlink data is received, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the downlink data of the UE to the S-GW in time. The occupation of space.

The foregoing describes that the MME sends a related indication message to the S-GW in the case that it is determined that the target UE can receive the downlink data, so that the S-GW sends the buffered downlink data to the target UE. In the embodiment of the present invention, the MME may further send, to the S-GW, time information that the target UE can receive downlink data, specifically, for example, RDX information of the target UE.

S735, the mobility management entity sends, to the radio access network node accessed by the target UE, a second request message for requesting time information that the target UE can receive downlink data.

S736, the mobility management entity receives, by the radio access network node, a second acknowledgement message that includes time information that the target UE can receive downlink data.

S737, the mobility management entity sends, according to the second acknowledgement message, the second indication message that includes the time information that the target UE can receive the downlink data, so that the serving gateway determines that the target UE can receive the downlink data. And the downlink data of the target UE that is buffered is sent to the target UE.

Optionally, in the embodiment of the present invention, the target UE is capable of receiving time information of downlink data. The DRX information is discontinuously received for the target UE.

It should be understood that the RDX information of the target UE may include absolute always reference information in addition to the RDX period of the target UE.

Specifically, as shown in FIG. 6, the detailed description is consistent with the above description, and details are not described herein again.

In the embodiment of the present invention, when the MME receives the indication information that the RAN configures the UE to be the eC-DRX and the eNB requests to buffer the downlink data, the MME provides the UE with the reachability indication information to the S-GW, and informs the S-GW that the S-GW should cache the Downlink data of the UE. Therefore, in the embodiment of the present invention, the core network node (the MME and the S-GW) may cache the downlink data of the UE configured to be connected to the DRX when the LUN node has insufficient buffer space, which may prevent the RAN node from buffering the downlink data. Performance degradation and possible packet loss. In addition, the MME requests the eNB to provide the eC-DRX information of the UE, and sends the eC-DRX information of the UE to the S-GW, so that the S-GW obtains the time that the UE converts to reach according to the eC-DRX information of the UE, where When the UE is reachable, the buffered downlink data is sent to the UE. Therefore, when the UE is reachable, that is, the downlink data can be received, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the timely The occupation of the downlink data of the UE to the buffer space of the S-GW.

It should be understood that, in the embodiment of the present invention, the mobility management entity may also carry the time information that the target UE can receive the downlink data in the first indication message, so that the serving gateway not only knows the current target UE according to the first indication message. It is not able to receive downlink data (also referred to as unreachable), and it is also known when the target UE can receive downlink data (also referred to as reachable).

Optionally, in the embodiment of the present invention, the first indication message further includes time information that the target UE can receive downlink data, so that the serving gateway sends the downlink data to the target UE if the target UE can receive downlink data. Send downlink data.

It should be understood that the technical solution provided by the embodiment of the present invention can save signaling overhead to a certain extent.

S740. The mobility management entity receives a downlink data notification message that is sent by the serving gateway to indicate downlink data arrival of the target UE when receiving downlink data of the target UE.

It should be understood that, when receiving the downlink data of the target UE, the serving gateway sends a downlink data notification message indicating that the downlink data of the target UE arrives to the mobility management entity, so that the mobility management entity can learn the target UE. The downlink data arrives, so as to trigger the information that the target UE can receive the downlink data, so that the subsequent serving gateway delivers the buffered downlink data to the target UE.

Receiving, by the mobility management entity, a downlink data notification message sent by the serving gateway to indicate downlink data of the target UE;

The mobility management entity sends a downlink data notification acknowledgement message to the serving gateway, to indicate that the serving gateway caches the downlink data of the target UE.

Therefore, in the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, the mobility management entity notifies the serving gateway to buffer the downlink data of the target UE, and it should be understood that the serving gateway is relative to the radio access network node. (Especially small base stations with limited buffer space), the cache space is large, and the data cache performance is also good. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

With reference to FIG. 1 to FIG. 7 , a method for processing downlink data according to an embodiment of the present invention is described in detail from the perspective of a serving gateway and a mobility management entity, and will be described from the perspective of a radio access network node in conjunction with FIG. 8 . A method of processing downlink data in an embodiment of the invention.

FIG. 8 illustrates a method 800 of processing downlink data in accordance with an embodiment of the present invention, the method 800 including:

S810. The radio access network node determines that the target user equipment UE is not capable of receiving downlink data.

S820, the radio access network node sends a first indication message to the serving gateway to indicate that the target UE is not capable of receiving downlink data, by using the mobility management entity, so that the serving gateway caches downlink data of the target UE.

S830. The radio access network node sends the mobility access entity to the serving gateway by using the mobility management entity. The second indication message indicating that the target UE can receive the downlink data, so that the serving gateway sends the buffered downlink data of the target UE to the target UE if the target UE can receive the downlink data.

It should be understood that the RAN node is a serving access network element corresponding to the target UE, for example, a current serving base station of the target UE, specifically, for example, an eNB.

In the embodiment of the present invention, it is determined that the target UE is unable to receive the downlink data, and sends an indication message to the core network node, such as the mobility management entity and the serving gateway, to indicate that the target UE is unable to receive downlink data, so as to facilitate the service gateway. Cache the downlink data of the target UE; it should be understood that the serving gateway has a larger buffer space and better data caching performance than the radio access network node (especially a small base station with limited buffer space), for example, even if the target UE The sleep period reaches the minute level, and there is no easy problem with insufficient cache space. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

Optionally, in the embodiment of the present invention, the S810, the radio access network node determines that the target user equipment UE is not capable of receiving downlink data, including:

In the embodiment of the present invention, the target UE is determined to be in the connected state DRX (C-DRX) mode. When the downlink data of the target UE arrives, the mobility management entity notifies the serving gateway to buffer the downlink data of the target UE. It should be understood that the serving gateway is relatively For wireless access network nodes (especially small base stations with limited buffer space), the cache space is large, and the data cache performance is also good. For example, even if the target UE's sleep period reaches the minute level, the cache space is not easily insufficient. The problem. Therefore, Compared with the prior art, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, thereby improving the transmission downlink. The reliability of the data.

Optionally, in the embodiment of the present invention, after the radio access network node sends, by the mobility management entity, the first indication message indicating that the target UE cannot receive the downlink data by using the mobility management entity, the method further includes: :

S840. The radio access network node sends, to the mobility management entity, a request message for requesting to buffer downlink data of the target UE, when determining that the radio access network node has insufficient buffer space.

Specifically, when the LUN of the RAN node corresponding to the target UE is insufficient, the RAN node sends a request message for requesting downlink data of the cache target UE to the MME, and the MME sends the S-GW to indicate the The target UE is not capable of receiving a first indication message of downlink data (which may also be referred to as unreachable).

In the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, for example, when the downlink data of the target UE in the connected state DRX (C-DRX) arrives, the RAN node corresponding to the target UE When the buffer space is insufficient, the downlink data of the target UE is buffered by the S-GW. In other words, in the embodiment of the present invention, the RAN node cache of the target UE When the space is sufficient, the downlink data of the target UE is buffered according to a conventional scheme. When the buffer space of the RAN node is insufficient, the downlink data of the target UE is cached by the core network node serving gateway, that is, the method for processing downlink data according to the embodiment of the present invention can be compatible with the prior art, thereby being more flexible. The downlink data of the target UE is cached.

Optionally, in the embodiment of the present invention, the S800 sends, by the mobility management entity, the second indication message that is used by the mobility management entity to indicate that the target UE can receive downlink data, including:

S831. The radio access network node receives a first request message sent by the mobility management entity for requesting to notify the target UE to stop the DRX mode.

S832, the radio access network node notifies the target UE to stop the DRX mode, and if it is determined that the target UE stops the DRX mode, sends the second to the mobility management entity to indicate that the target UE has stopped the DRX mode. An indication message is provided to facilitate the mobility management entity to inform the serving gateway that the target UE is capable of receiving downlink data.

Specifically, please refer to the description above in conjunction with FIG. 2, and details are not described herein again.

In the embodiment of the present invention, the second acknowledgment message is sent to the MME to indicate that the target UE has stopped DRX, so that the MME notifies the S-GW to send the buffered downlink data to the target UE according to the second acknowledgement message. Therefore, in the case that the UE can receive the downlink data, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the downlink data of the UE in time. Occupancy of the S-GW's cache space.

Optionally, in the embodiment of the present invention, the S800 sends, by the mobility management entity, the second finger that is used by the mobility management entity to indicate that the target UE can receive downlink data. Display messages, including:

S833. The radio access network node receives a second request message that is sent by the mobility management entity to request that the target UE can receive time information of downlink data.

S834, the radio access network node sends, to the mobility management entity, the second indication message that includes time information that the target UE can receive downlink data, so that the mobility management entity sends the time information to the serving gateway, so that The serving gateway sends downlink data to the target UE if the target UE can receive downlink data.

Specifically, the DRX information of the target UE includes a DRX cycle, where the DRX cycle includes an activation period and a sleep period, and the target UE can receive downlink data during the activation period.

The radio access network node sends the second indication message including the DRX information of the target UE to the mobility management entity, so that the mobility management entity sends the DRX information of the target UE to the serving gateway, where the service gateway is configured according to The DRX information of the target UE determines a time at which the target UE can receive downlink data, and sends the buffered downlink data of the target UE to the target UE.

Specifically, please refer to the description above in conjunction with FIG. 6, and details are not described herein again.

In the embodiment of the present invention, a third acknowledgement message including the DRX information of the target UE is sent to the MME, so that the MME notifies the S-GW of the third acknowledgement message, so that the S-GW learns that the target UE can receive At the time of downlink data, the buffered downlink data is further transmitted to the target UE. Therefore, in the case that the UE can receive the downlink data, the downlink data of the UE buffered in the S-GW is sent to the UE in time, which can improve the transmission efficiency of the downlink data of the UE, and release the downlink data of the UE in time. Occupancy of the S-GW's cache space.

In the embodiment of the present invention, when the downlink data of the target UE in the connected state DRX (C-DRX) arrives, when it is determined that the buffer space of the RAN node corresponding to the target UE is insufficient, the requesting core network node (MME) caches the Downlink data of the target UE, thereby adding a storage location for buffering downlink data of the target UE in the connected state DRX based on the RAN node, which can effectively reduce the load of the RAN node; on the other hand, the core network node (for example, S-GW) Compared with the RAN node of the radio access network (especially the small base station with limited buffer space), the buffer space is large, and the data cache performance is also good. Therefore, even if the dormancy period of the target UE reaches the minute level, The problem of insufficient cache space will easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the RAN node buffering the downlink data of the UE, and the problem of packet loss that may occur, compared to the prior art.

The method for processing downlink data according to an embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 8. Hereinafter, an apparatus for processing downlink data according to an embodiment of the present invention will be described in detail with reference to FIG. 9 to FIG.

FIG. 9 shows a schematic block diagram of an apparatus 900 for processing downlink data according to an embodiment of the present invention, the apparatus 900 comprising:

The receiving module 910 is configured to receive, by the mobility management entity, a first indication message that is used to indicate that the target user equipment UE is not capable of receiving downlink data.

The buffering module 920 is configured to buffer downlink data of the target UE when receiving the downlink data of the target UE indicated by the first indication message received by the receiving module;

The sending module 930 is configured to send downlink data of the target UE buffered by the cache module to the target UE, if it is determined that the target UE can receive downlink data.

Therefore, in the embodiment of the present invention, when the downlink data of the target UE that cannot receive the downlink data arrives, the core network node serving gateway caches the downlink data of the target UE, and it should be understood that the serving gateway is relative to the wireless access network. Nodes (especially small base stations with limited cache space) have large cache space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

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

Optionally, in the embodiment of the present invention, the receiving module is specifically configured to receive the first indication message that is sent by the mobility management entity when determining that the buffer space of the wireless access network node is insufficient.

Optionally, in the embodiment of the present invention, the receiving module is specifically configured to receive the first indication message sent by the mobility management entity, where the first indication message is that the mobility management entity is based on the radio access network node. The sent message indicating that the target UE is in the connected state discontinuous reception DRX mode is sent to the serving gateway.

Optionally, in the embodiment of the present invention, the sending module 930 includes:

Optionally, in the embodiment of the present invention, the third indication message includes discontinuous reception DRX information of the target UE.

The sending module 930 includes:

Optionally, in the embodiment of the present invention, the sending module is specifically configured to, when receiving an indirect data forwarding tunnel request sent by the mobility management entity, determine the target UE in a handover process based on an S1 interface. The downlink data can be received, and the buffered downlink data of the target UE is sent to the target UE.

Optionally, in the embodiment of the present invention, the sending module is further configured to: when receiving the downlink data of the target UE indicated by the first indication message, send, to the mobility management entity, the target UE. The downlink data notification message that the downlink data arrives.

It should be understood that the apparatus 900 for processing downlink data according to an embodiment of the present invention may correspond to a serving gateway (S-GW) in a method for processing downlink data according to an embodiment of the present invention, and each module in the device 900 that processes downlink data. The above and other operations and/or functions are respectively implemented in order to implement the corresponding processes of the respective methods in FIG. 1 to FIG. 8 , and are not described herein again for brevity.

FIG. 10 is a schematic block diagram of an apparatus 1000 for processing downlink data according to an embodiment of the present invention. The apparatus 1000 for processing downlink data includes:

a determining module 1010, configured to determine that the target user equipment UE is not capable of receiving downlink data;

The first sending module 1020 is configured to send, to the serving gateway, a first indication message for indicating that the target UE determined by the determining module is not capable of receiving downlink data, so that the serving gateway caches the mesh The downlink data of the UE.

In the embodiment of the present invention, it is determined that the target UE is unable to receive downlink data. When the downlink data of the target UE arrives, the mobility management entity notifies the serving gateway to buffer the downlink data of the target UE, and it should be understood that the serving gateway is relative to the wireless access network. Nodes (especially small base stations with limited cache space) have large cache space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

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

Optionally, in the embodiment of the present invention, the first sending module is specifically configured to send the first indication message to the serving gateway if the buffer of the radio access network node accessed by the target UE is insufficient.

Optionally, in the embodiment of the present invention, the first sending module includes:

Optionally, in the embodiment of the present invention, the determining module includes:

a second receiving unit, configured to receive, by the radio access network node that is accessed by the target UE, indication information that is used to indicate that the target UE is in a connected state in a discontinuous reception DRX mode;

Optionally, in the embodiment of the present invention, the device further includes:

The second sending module 1030 is configured to send, to the serving gateway, a second indication message for indicating that the target UE can receive downlink data, so that the serving gateway will cache the target if the target UE can receive downlink data. The downlink data of the UE is sent to the target UE.

Optionally, in the embodiment of the present invention, the target UE is in a disconnected DRX mode in a connected state.

The second sending module includes:

The first sending unit is further configured to: according to the first acknowledgement message, determine that the target UE can be connected

Receiving downlink data and transmitting the second indication message to the serving gateway.

Optionally, in the embodiment of the present invention, the second sending module is specifically configured to: when the S1 interface-based handover procedure of the target UE is received, the radio access network node that is accessed by the target UE is sent by the radio access network node. When the signaling is switched, it is determined that the target UE can receive downlink data, and send the second indication message to the serving gateway.

Optionally, in the embodiment of the present invention, the second sending module includes:

It should be understood that the apparatus 1000 for processing downlink data according to an embodiment of the present invention may correspond to the present disclosure. The above described and other operations and/or functions of the respective modules in the device 1000 for processing downlink data in the embodiment of the present embodiment are respectively implemented in order to implement the respective ones of FIGS. 1 to 8 The corresponding process of the method is not repeated here for the sake of brevity.

FIG. 11 is a schematic block diagram of an apparatus 1100 for processing downlink data according to an embodiment of the present invention. The apparatus 1100 for processing downlink data includes:

a determining module 1110, configured to determine that the target user equipment UE is not capable of receiving downlink data;

The first sending module 1120 is configured to send, by the mobility management entity, a first indication message that is used by the mobility management entity to indicate that the target UE that is determined by the determining module is not capable of receiving downlink data, so that the serving gateway caches the downlink of the target UE. data;

a second sending module 1130, configured to send, by the mobility management entity, a second indication message that is used by the mobility management entity to indicate that the target UE can receive downlink data, so that the serving gateway can receive downlink data in the target UE. The downlink data of the target UE that is buffered is sent to the target UE.

It should be understood that the device 1100 is, for example, a method for processing downlink data provided by an embodiment of the present invention. Wireless access network node.

Optionally, in the embodiment of the present invention, after the dynamic management entity sends a first indication message indicating that the target UE is not capable of receiving downlink data, the mobility management entity determines that the cache space of the wireless access network node is insufficient. And transmitting, to the mobility management entity, a request message for requesting to buffer downlink data of the target UE.

Optionally, in the embodiment of the present invention, the determining module is specifically configured to configure the target UE to be in a connected state discontinuous reception DRX mode.

It should be understood that the apparatus 1100 for processing downlink data according to an embodiment of the present invention may correspond to a radio access network node (RAN node, such as an eNB) in a method for processing downlink data according to an embodiment of the present invention, and the device 1100 that processes downlink data. The above and other operations and/or functions of the respective modules in the above are respectively to implement the corresponding processes of the respective methods in FIG. 1 to FIG. 8 , and are not described herein again for brevity.

In the embodiment of the present invention, determining that the target UE cannot receive downlink data to the core network node, For example, the mobility management entity and the serving gateway send an indication message indicating that the target UE is unable to receive downlink data, so that the serving gateway buffers downlink data of the target UE; it should be understood that the serving gateway is relative to the radio access network node ( In particular, small base stations with limited buffer space have large cache space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not easily occur. Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

As shown in FIG. 12, an embodiment of the present invention further provides a service gateway 1200. The service gateway 1200 includes a processor 1210, a memory 1220, a bus system 1230, a receiver 1240, and a transmitter 1250. The processor 1210, the memory 1220, the receiver 1240, and the transmitter 1250 are connected by a bus system 1230 for storing instructions, and the processor 1210 is configured to execute instructions stored by the memory 1220 to control the receiver 1240 to receive. Signal and control transmitter 1250 to send a signal. The receiver 1240 is configured to receive a first indication message that is sent by the mobility management entity to indicate that the target user equipment UE is not capable of receiving downlink data, and the processor 1210 is configured to: after receiving the first indication message, When the downlink data of the target UE is used, the downlink data of the target UE is buffered; and the transmitter 1250 is configured to: after determining that the target UE can receive the downlink data, send the buffered downlink data of the target UE to the target UE. .

Therefore, in the embodiment of the present invention, it is determined that the target UE is not capable of receiving downlink data. When the downlink data of the target UE arrives, the core network node serving gateway caches downlink data of the target UE, and it should be understood that the serving gateway is relatively wireless. Access network nodes (especially small base stations with limited buffer space) have large cache space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not occur easily. . Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem, and thus can improve the performance of the present invention. The reliability of transmitting downlink data.

Optionally, in the embodiment of the present invention, the receiver 1240 is specifically configured to receive the first indication message that is sent by the mobility management entity when determining that the buffer space of the radio access network node is insufficient.

Optionally, in the embodiment of the present invention, the receiver 1240 is specifically configured to receive the first indication message sent by the mobility management entity, where the first indication message is based on the mobility management entity. The message sent by the radio access network node to indicate that the target UE is in the connected state discontinuous reception DRX mode is sent to the serving gateway.

Optionally, in the embodiment of the present invention, the receiver 1240 is specifically configured to receive, by the mobility management entity, a second indication message that is used by the mobility management entity to indicate that the target UE is capable of receiving downlink data, where the second indication message is The mobility management entity sends the message to the service gateway based on the message sent by the radio access network node to indicate that the target UE can receive downlink data, or the second indication message is that the mobility management entity is based on the S1 interface. The processor 1210 is specifically configured to determine, according to the second indication message, that the target UE can receive the downlink, if the handover signaling sent by the radio access network node is received in the handover process. The transmitter 1250 is specifically configured to send the buffered downlink data of the target UE to the target UE.

Optionally, in the embodiment of the present invention, the processor 1210 is specifically configured to: when the receiver 1240 receives the indirect data forwarding tunnel request sent by the mobility management entity, in the S1 interface-based handover process, It is determined that the target UE can receive downlink data, and the control transmitter 1250 sends the cached downlink data of the target UE to the target UE.

Optionally, in the embodiment of the present invention, the receiver 1240 is specifically configured to receive a third indication message that is sent by the mobility management entity to indicate time information that the target UE can receive downlink data, where the processor 1210 is specific. The method is used to determine, according to the third indication message, a time at which the target UE can receive downlink data. The transmitter 1250 is specifically configured to: when the target UE is capable of receiving downlink data, send the cached target to the target UE. Downlink data of the UE.

Optionally, in the embodiment of the present invention, the first indication message further includes time information that the target UE can receive the downlink data, where the processor 1210 is specifically configured to determine, according to the time information that the target UE can receive the downlink data, The time at which the target UE can receive the downlink data is used by the transmitter 1250. The transmitter 1250 is specifically configured to: when the target UE can receive the downlink data, send the cached downlink data of the target UE to the target UE.

Optionally, in the embodiment of the present invention, the processor 1210 is specifically configured to: when the receiver 1240 receives the downlink data of the target UE indicated by the first indication message, control the transmitter 1250 to the mobility management. The entity sends a downlink data pass indicating that the downlink data of the target UE arrives Know the news.

It should be understood that, in the embodiment of the present invention, the processor 1210 may be a central processing unit ("CPU"), and the processor 1210 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 1220 can include read only memory and random access memory and provides instructions and data to the processor 1210. A portion of the memory 1220 may also include a non-volatile random access memory. For example, the memory 1220 can also store information of the device type.

The bus system 1230 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 1230 in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1210 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 1220, and the processor 1210 reads the information in the memory 1220 and, in conjunction with its hardware, performs the steps of the above method. To avoid repetition, it will not be described in detail here.

It should be understood that the serving gateway 1200 according to an embodiment of the present invention may correspond to a serving gateway (S-GW) in a method for processing downlink data according to an embodiment of the present invention, and a device that may correspond to processing downlink data according to an embodiment of the present invention. The above and other operations and/or functions of the respective modules in the service gateway 1200 are respectively implemented in order to implement the respective processes of the respective methods in FIG. 1 to FIG. 8. For brevity, no further details are provided herein.

Therefore, in the embodiment of the present invention, it is determined that the target UE is not capable of receiving downlink data. When the downlink data of the target UE arrives, the core network node serving gateway caches downlink data of the target UE, and it should be understood that the serving gateway is relatively wireless. Access network nodes (especially small base stations with limited buffer space) have large cache space and good data cache performance. For example, even if the target UE's sleep period reaches the minute level, the problem of insufficient cache space will not occur easily. . Therefore, the embodiment of the present invention can effectively avoid the problem of performance degradation caused by the downlink access data of the UE accessed by the radio access network node accessed by the UE, and the possible packet loss problem. Furthermore, the reliability of transmitting downlink data can be improved.

As shown in FIG. 13 , an embodiment of the present invention further provides a mobility management entity 1300. The network device 1300 includes a processor 1310, a memory 1320, a bus system 1330, a receiver 1340, and a transmitter 1350. The processor 1310, the memory 1320, the receiver 1340, and the transmitter 1350 are connected by a bus system 1330 for storing instructions for executing the instructions stored by the memory 1320 to control the receiver 1340 to receive. Signal, and control transmitter 1350 to send a signal. The processor 1310 is configured to determine that the target user equipment UE is not capable of receiving downlink data.

Optionally, in the embodiment of the present invention, the transmitter 1250 is specifically configured to: when the cache of the radio access network node accessed by the target UE is insufficient, the mobility management entity sends the first to the serving gateway. Indicate the message.

Optionally, in the embodiment of the present invention, the receiver 1340 is specifically configured to receive a request message sent by the radio access network node for requesting to buffer downlink data of the target UE, where the request message is the wireless The access network node sends the first indication message to the service gateway according to the request message when determining that the buffer space of the radio access network node is insufficient.

Optionally, in the embodiment of the present invention, the receiver 1340 is specifically configured to: receive, by the radio access network node accessed by the target UE, an indication for indicating that the target UE is in a connected state in a discontinuous reception DRX mode. The processor 1310 is specifically configured to: according to the indication information, determine that the target UE cannot receive downlink data.

Optionally, in the embodiment of the present invention, the transmitter 1350 is configured to send, to the serving gateway, a first indication message that is used to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway caches downlink data of the target UE. Sending to the serving gateway to indicate that the target UE can receive a second indication message of the downlink data, so that the serving gateway sends the buffered downlink data of the target UE to the target UE if the target UE can receive downlink data.

Optionally, in the embodiment of the present invention, the target UE is in a non-contiguous connection DRX mode in a connected state, and the transmitter 1350 is specifically configured to send, to the radio access network node, a request for the radio access network node to notify the The target UE stops the first request message of the DRX mode; the receiver 1340 is specifically configured to receive a first acknowledgement message sent by the radio access network node to indicate that the target UE has stopped the DRX mode; the transmitter 1350 is specifically configured to: The mobility management entity determines, according to the first acknowledgement message, that the target UE can receive downlink data, and sends the second indication message to the serving gateway.

Optionally, in the embodiment of the present invention, the processor 1310 is specifically configured to: when the mobility management entity receives the handover signaling sent by the radio access network node in the S1 interface-based handover procedure, the receiver 1340 receives the handover signaling sent by the radio access network node. Determining that the target UE can receive downlink data, and controlling the transmitter 1350 to send the second indication message to the serving gateway.

Optionally, in the embodiment of the present invention, the transmitter 1350 is specifically configured to: send, to the radio access network node accessed by the target UE, a second request message for requesting that the target UE can receive time information of the downlink data; The receiver 1340 is specifically configured to receive, by the radio access network node, a second acknowledgement message that includes time information that the target UE can receive downlink data, and a transmitter 1350, configured to send, according to the second acknowledgement message, the serving gateway The second indication message including the time information that the target UE can receive the downlink data is sent, so that the serving gateway determines the time at which the target UE can receive the downlink data, and sends the buffered downlink data of the target UE to the target UE.

Optionally, in the embodiment of the present invention, the receiver 1340 is specifically configured to receive, by the serving gateway, a downlink data notification message that is used to indicate that the downlink data of the target UE arrives when receiving the downlink data of the target UE.

It should be understood that, in the embodiment of the present invention, the processor 1310 may be a central processing unit ("CPU"), and the processor 1310 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 1320 can include read only memory and random access memory and provides instructions and data to the processor 1310. A portion of the memory 1320 may also include a non-volatile random access memory. For example, the memory 1320 can also store information of the device type.

The bus system 1330 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 1330 in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1310 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 1320, and the processor 1310 reads the information in the memory 1320 and performs the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

It should be understood that the apparatus 1000 for processing downlink data according to an embodiment of the present invention may correspond to a mobility management entity (MME) in a method for processing downlink data according to an embodiment of the present invention, and each module in the device 1000 that processes downlink data. The above and other operations and/or functions are respectively implemented in order to implement the corresponding processes of the respective methods in FIG. 1 to FIG. 13 , and are not described herein again for brevity.

As shown in FIG. 14, an embodiment of the present invention further provides a radio access network node 1400, where The line access network node 1400 includes a processor 1410, a memory 1420, a bus system 1430, a receiver 1440, and a transmitter 1450. The processor 1410, the memory 1420, the receiver 1440, and the transmitter 1450 are connected by a bus system 1430 for storing instructions for executing the instructions stored by the memory 1420 to control the receiver 1440 to receive. Signal, and control transmitter 1450 to send a signal. The processor 1410 is configured to: determine that the target user equipment UE is not capable of receiving downlink data, and the transmitter 1450 is configured to send, by the mobility management entity, a first indication, to the serving gateway, that the target UE is not capable of receiving downlink data. a message, so that the service gateway buffers downlink data of the target UE; and the mobility management entity sends a second indication message to the serving gateway to indicate that the target UE can receive downlink data, so that the service gateway is at the target The downlink data of the target UE that is buffered is sent to the target UE when the UE can receive the downlink data.

Optionally, in the embodiment of the present invention, the transmitter 1450 is specifically configured to: when determining that the radio access network node has insufficient buffer space, send, to the mobility management entity, downlink data for requesting to cache the target UE. Request message.

Optionally, in the embodiment of the present invention, the processor 1410 is specifically configured to configure the target UE to be in a connected state discontinuous reception DRX mode.

Optionally, in the embodiment of the present invention, the receiver 1440 is specifically configured to receive a first request message that is sent by the mobility management entity to request to notify the target UE to stop the DRX mode. The processor 1410 is specifically configured to notify the The target UE stops the DRX mode, and in the case that it is determined that the target UE stops the DRX mode, the control transmitter 1450 sends the second indication message to the mobility management entity to indicate that the target UE has stopped the DRX mode, so as to facilitate the The mobility management entity informs the serving gateway that the target UE is capable of receiving downlink data.

Optionally, in the embodiment of the present invention, the receiver 1440 is specifically configured to receive a second request message that is sent by the mobility management entity to request that the target UE can receive time information of downlink data, and the transmitter 1450 is configured to: Transmitting, to the mobility management entity, the second indication message including time information that the target UE can receive downlink data, so that the mobility management entity sends the time information to the serving gateway, so that the service gateway is at the target The UE can send downlink data to the target UE if it can receive downlink data.

Receiving, by the mobility management entity, a second request message for requesting DRX information of the target UE, where the DRX information of the target UE includes a DRX cycle, where the DRX cycle includes an activation period and a dormancy period, and the target UE can be activated during the activation period. Receiving downlink data; the transmitter 1450 is configured to send the second indication message that includes the DRX information of the target UE to the mobility management entity, so that the mobility management entity sends the DRX information of the target UE to the serving gateway, The serving gateway determines, according to the DRX information of the target UE, a time at which the target UE can receive downlink data, and sends the buffered downlink data of the target UE to the target UE.

It should be understood that, in the embodiment of the present invention, the processor 1410 may be a central processing unit ("CPU"), and the processor 1410 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory 1420 can include read only memory and random access memory and provides instructions and data to the processor 1410. A portion of the memory 1420 can also include a non-volatile random access memory. For example, the memory 1420 can also store information of the device type.

The bus system 1430 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 1430 in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1410 or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, etc., and a mature storage medium in the field. in. The storage medium is located in the memory 1420, and the processor 1410 reads the information in the memory 1420 and, in conjunction with its hardware, performs the steps of the above method. To avoid repetition, it will not be described in detail here.

It should be understood that the apparatus 1100 for processing downlink data according to an embodiment of the present invention may correspond to a radio access network node (RAN node, such as an eNB) in a method for processing downlink data according to an embodiment of the present invention, and the device 1100 that processes downlink data. The above and other operations and/or functions of the respective modules in order to implement the respective processes of the respective methods in FIG. 1 to FIG. 14 are omitted for brevity.

It is also to be understood that the first, the second, the third and the various figures are referred to herein, and are not intended to limit the scope of the embodiments of the invention.

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

It will be apparent to those skilled in the art that the above description is convenient and concise for the description. For the specific working process of the system, the device and the unit, reference may be made to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A method for processing downlink data, comprising:

The serving gateway receives a first indication message that is sent by the mobility management entity and is used to indicate that the target user equipment UE is not capable of receiving downlink data.

The serving gateway buffers downlink data of the target UE when receiving downlink data of the target UE;

And determining, by the serving gateway, the downlink data of the cached target UE to the target UE, if the target UE is configured to receive downlink data.
The method according to claim 1, wherein the serving gateway sends the cached downlink data of the target UE to the target UE, including determining that the target UE is capable of receiving downlink data, including :

Receiving, by the serving gateway, a second indication message that is sent by the mobility management entity to indicate that the target UE is capable of receiving downlink data;

The serving gateway determines, according to the second indication message, that the target UE can receive downlink data, and sends the cached downlink data of the target UE to the target UE.
The method according to claim 1, wherein the serving gateway sends the cached downlink data of the target UE to the target UE, including determining that the target UE is capable of receiving downlink data, including :

Receiving, by the serving gateway, a third indication message that is sent by the mobility management entity to indicate time information that the target UE can receive downlink data;

Determining, by the serving gateway, a time at which the target UE can receive downlink data according to the third indication message;

The serving gateway sends the cached downlink data of the target UE to the target UE at a time when the target UE can receive downlink data.
The method according to claim 3, wherein the third indication message comprises discontinuous reception DRX information of the target UE.
The method according to claim 1, wherein the first indication message further includes time information that the target UE can receive downlink data;

And the determining, by the serving gateway, the downlink data of the cached target UE, where the serving UE is configured to receive the downlink data, includes:

The serving gateway determines, according to time information that the target UE can receive downlink data, a time at which the target UE can receive downlink data;

The serving gateway sends the cached downlink data of the target UE to the target UE at a time when the target UE can receive downlink data.
The method according to claim 5, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.
The method according to claim 1, wherein the serving gateway sends the cached downlink data of the target UE to the target UE, including determining that the target UE is capable of receiving downlink data, including :

Determining, by the serving gateway, that the target UE is capable of receiving downlink data when receiving an indirect data forwarding tunnel request sent by the mobility management entity in an S1 interface-based handover procedure of the target UE, and The target UE sends the buffered downlink data of the target UE.
The method according to any one of claims 1 to 7, wherein the method further comprises:

When receiving the downlink data of the target UE indicated by the first indication message, the serving gateway sends a downlink data notification message indicating that the downlink data of the target UE arrives to the mobility management entity.
A method for processing downlink data, comprising:

The mobility management entity determines that the target user equipment UE is not capable of receiving downlink data;

The mobility management entity sends a first indication message to the serving gateway to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway buffers downlink data of the target UE.
The method according to claim 9, wherein the mobility management entity sends a first indication message to the serving gateway to indicate that the target UE is not capable of receiving downlink data, including:

And the mobility management entity sends the first indication message to the serving gateway if the buffer of the radio access network node accessed by the target UE is insufficient.
The method according to claim 10, wherein the mobility management entity sends the first indication to a serving gateway if the buffer of the radio access network node accessed by the target UE is insufficient News, including:

The mobility management entity receives the request for caching sent by the radio access network node a request message of downlink data of the target UE, where the request message is sent by the radio access network node to the mobility management entity when determining that a buffer space of the radio access network node is insufficient;

And the mobility management entity sends the first indication message to the serving gateway according to the request message.
The method according to any one of claims 9 to 11, wherein the mobility management entity determines that the target user equipment UE is not capable of receiving downlink data, including:

And the mobility management entity receives, by the radio access network node that is accessed by the target UE, indication information that is used to indicate that the target UE is in a connected state in a discontinuous reception DRX mode;

The mobility management entity determines, according to the indication information, that the target UE is not capable of receiving downlink data.
The method according to any one of claims 9 to 12, wherein the method further comprises:

Transmitting, by the mobility management entity, a second indication message, to the serving gateway, to indicate that the target UE is capable of receiving downlink data, so that the serving gateway is to be cached if the target UE is capable of receiving downlink data. The downlink data of the target UE is sent to the target UE.
The method according to claim 13, wherein said target UE is in a connected state of discontinuous connection DRX mode,

The mobility management entity sends, to the serving gateway, a second indication message that is used to indicate that the target UE can receive downlink data, including:

Transmitting, by the mobility management entity, a first request message for requesting the radio access network node to notify the target UE to stop the DRX mode, to a radio access network node that is accessed by the target UE;

Receiving, by the mobility management entity, a first acknowledgement message sent by the radio access network node to indicate that the target UE has stopped the DRX mode;

The mobility management entity determines, according to the first acknowledgement message, that the target UE is capable of receiving downlink data, and sends the second indication message to the serving gateway.
The method according to claim 13, wherein the mobility management entity sends a second indication message to the serving gateway to indicate that the target UE can receive downlink data, including:

When the mobility management entity is in the S1 interface-based handover process of the target UE, And receiving the handover signaling sent by the radio access network node that is accessed by the target UE, determining that the target UE is capable of receiving downlink data, and sending the second indication message to the serving gateway.
The method according to claim 13, wherein the mobility management entity sends a second indication message to the serving gateway to indicate that the target UE can receive downlink data, including:

Transmitting, by the mobility management entity, a second request message for requesting the target UE to receive time information of downlink data, to a radio access network node that is accessed by the target UE;

Receiving, by the mobility management entity, a second acknowledgement message sent by the radio access network node that includes time information that the target UE can receive downlink data;

Transmitting, by the mobility management entity, the second indication message that includes time information that the target UE can receive downlink data, according to the second acknowledgement message, to facilitate the serving gateway to determine the target The UE can receive the time of the downlink data, and send the buffered downlink data of the target UE to the target UE.
The method according to claim 16, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.
The method according to any one of claims 9 to 12, wherein the first indication message further includes time information that the target UE can receive downlink data, so that the serving gateway acquires the target UE. A time at which downlink data can be received to transmit downlink data to the target UE.
The method according to claim 18, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.
The method according to any one of claims 9 to 19, wherein the method further comprises:

The mobility management entity receives a downlink data notification message that is sent by the serving gateway to indicate downlink data arrival of the target UE when receiving downlink data of the target UE.
A method for processing downlink data, comprising:

The radio access network node determines that the target user equipment UE is not capable of receiving downlink data;

Transmitting, by the mobility management entity, a first indication message, by the mobility management entity, to the serving gateway, to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway buffers downlink data of the target UE;

Sending, by the mobility management entity, the radio access network node to the serving gateway a second indication message for indicating that the target UE is capable of receiving downlink data, so that the serving gateway sends the buffered downlink data of the target UE to the target if the target UE is capable of receiving downlink data. UE.
The method according to claim 21, wherein after the radio access network node sends, by the mobility management entity, a first indication message indicating that the target UE is unable to receive downlink data, to the serving gateway, The method also includes:

And when the radio access network node determines that the radio access network node has insufficient buffer space, sends a request message for requesting to buffer downlink data of the target UE to the mobility management entity.
The method according to claim 21 or 22, wherein the radio access network node determines that the target user equipment UE is not capable of receiving downlink data, including:

The radio access network node configures the target UE as a discontinuous reception DRX mode in a connected state.
The method according to claim 23, wherein the radio access network node sends, by the mobility management entity, a second indication message for indicating that the target UE can receive downlink data, to the serving gateway, include:

Receiving, by the mobile access network node, a first request message sent by the mobility management entity for requesting to notify the target UE to stop the DRX mode;

The radio access network node notifies the target UE to stop the DRX mode, and if it is determined that the target UE stops the DRX mode, sends the mobility management entity to indicate that the target UE has stopped the DRX mode. The second indication message, so that the mobility management entity informs the serving gateway that the target UE can receive downlink data.
The method according to claim 23, wherein the radio access network node sends, by the mobility management entity, a second indication message for indicating that the target UE can receive downlink data, to the serving gateway, include:

Receiving, by the radio access network node, a second request message that is sent by the mobility management entity to request that the target UE can receive time information of downlink data;

Transmitting, by the radio access network node, the second indication message that includes the time information that the target UE can receive downlink data, to the mobility management entity, so that the mobility management entity sends the location information to the serving gateway. The time information is used to facilitate the serving gateway to send downlink data to the target UE if the target UE is capable of receiving downlink data.
The method according to claim 25, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.
An apparatus for processing downlink data, comprising:

a receiving module, configured to receive a first indication message that is sent by the mobility management entity to indicate that the target user equipment UE is not capable of receiving downlink data;

a buffering module, configured to cache downlink data of the target UE when receiving the downlink data of the target UE by the receiving module;

And a sending module, configured to send downlink data of the target UE cached by the cache module to the target UE, if the target UE is configured to receive downlink data.
The device according to claim 27, wherein the sending module comprises:

a first receiving unit, configured to receive a second indication message that is sent by the mobility management entity to indicate that the target UE is capable of receiving downlink data;

The first sending unit is configured to determine, according to the second indication message that is received by the first receiving unit, that the target UE is capable of receiving downlink data, and send the cached downlink data of the target UE to the target UE.
The device according to claim 27, wherein the sending module comprises:

a second receiving unit, configured to receive a third indication message that is sent by the mobility management entity to indicate time information that the target UE can receive downlink data;

a first determining unit, configured to determine, according to the third indication message received by the second receiving unit, a time at which the target UE can receive downlink data;

And a second sending unit, configured to send the downlink data of the cached target UE to the target UE, where the target UE that is determined by the first determining unit is capable of receiving downlink data.
The apparatus according to claim 29, wherein said third indication message comprises discontinuous reception DRX information of said target UE.
The device according to claim 27, wherein the first indication message further includes time information that the target UE can receive downlink data;

The sending module includes:

a second determining unit, configured to determine, according to time information that the target UE can receive downlink data, a time at which the target UE can receive downlink data;

And a third sending unit, configured to send the cached downlink data of the target UE to the target UE at a time when the target UE that is determined by the second determining unit is capable of receiving downlink data.
The device according to claim 31, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.
The device according to claim 27, wherein the sending module is specifically configured to, when receiving an indirect data forwarding tunnel request sent by the mobility management entity, in an S1 interface-based handover procedure, Determining that the target UE is capable of receiving downlink data, and transmitting the buffered downlink data of the target UE to the target UE.
The device according to any one of claims 27 to 33, wherein the sending module is further configured to: when receiving the downlink data of the target UE indicated by the first indication message, The mobility management entity sends a downlink data notification message indicating that the downlink data of the target UE arrives.
An apparatus for processing downlink data, comprising:

a determining module, configured to determine that the target user equipment UE is not capable of receiving downlink data;

And a first sending module, configured to send, to the serving gateway, a first indication message that is used by the determining, by the determining module, that the target UE is not capable of receiving downlink data, so that the serving gateway caches downlink data of the target UE.
The device according to claim 35, wherein the first sending module is specifically configured to: if the buffer of the radio access network node accessed by the target UE is insufficient, send the first to the serving gateway An indication message.
The device according to claim 36, wherein the first sending module comprises:

a first receiving unit, configured to receive, by the radio access network node, a request message for requesting to buffer downlink data of the target UE, where the request message is that the radio access network node determines Sending to the mobility management entity when the buffer space of the wireless access network node is insufficient;

The first sending unit is configured to send the first indication message to the serving gateway according to the request message received by the first receiving unit.
The device according to any one of claims 35 to 37, wherein the determining module comprises:

a second receiving unit, configured to receive, by the radio access network node that is accessed by the target UE, indication information that is used to indicate that the target UE is in a connected state in a discontinuous reception DRX mode;

a determining unit, configured to determine, according to the indication information received by the second receiving unit The target UE is not able to receive downlink data.
The device according to any one of claims 35 to 38, wherein the device further comprises:

a second sending module, configured to send, to the serving gateway, a second indication message that is used to indicate that the target UE is capable of receiving downlink data, so that the serving gateway is to be cached if the target UE is capable of receiving downlink data. The downlink data of the target UE is sent to the target UE.
The device according to claim 39, wherein said target UE is in a connected state of discontinuous connection DRX mode,

The second sending module includes:

a second sending unit, configured to send, to the radio access network node accessed by the target UE, a first request message for requesting the radio access network node to notify the target UE to stop the DRX mode;

a third receiving unit, configured to receive a first acknowledgement message that is sent by the radio access network node to indicate that the target UE has stopped the DRX mode;

The second sending unit is further configured to: according to the first acknowledgement message, determine that the target UE is capable of receiving downlink data, and send the second indication message to the serving gateway.
The device according to claim 39, wherein the second sending module is configured to: when the S1 interface-based handover procedure of the target UE is received, receive the radio access of the target UE access When the handover signaling is sent by the network node, it is determined that the target UE can receive downlink data, and send the second indication message to the serving gateway.
The device according to claim 39, wherein the second sending module comprises:

a third sending unit, configured to send, to the radio access network node accessed by the target UE, a second request message for requesting that the target UE can receive time information of downlink data;

a fourth receiving unit, configured to receive, by the radio access network node, a second acknowledgement message that includes time information that the target UE can receive downlink data;

The third sending unit is further configured to send, according to the second acknowledgement message, the second indication message that includes time information that the target UE can receive downlink data, to facilitate the service gateway. Determining a time at which the target UE can receive downlink data, and sending the buffered downlink data of the target UE to the target UE.
The device according to claim 42, wherein said target UE is capable of receiving The time information for receiving the downlink data is discontinuous reception DRX information of the target UE.
The device according to any one of claims 35 to 38, wherein the first indication message further includes time information that the target UE can receive downlink data, so that the serving gateway is in the target UE. When the downlink data can be received, the downlink data is transmitted to the target UE.
The device according to claim 44, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.
The device according to any one of claims 35 to 45, wherein the device further comprises:

And a receiving module, configured to receive a downlink data notification message that is sent by the serving gateway, when the downlink data of the target UE is received, is used to indicate that the downlink data of the target UE arrives.
An apparatus for processing downlink data, comprising:

a determining module, configured to determine that the target user equipment UE is not capable of receiving downlink data;

a first sending module, configured to send, by the mobility management entity, a first indication message that is used by the mobility management entity to indicate that the target UE is not capable of receiving downlink data, so that the serving gateway caches downlink data of the target UE;

a second sending module, configured to send, by the mobility management entity, a second indication message, to the serving gateway, to indicate that the target UE is capable of receiving downlink data, so that the serving gateway can receive at the target UE In the case of downlink data, the buffered downlink data of the target UE is sent to the target UE.
The device according to claim 47, wherein the device further comprises:

And a third sending module, configured to send, to the mobility management entity, a request message for requesting to buffer downlink data of the target UE, when determining that the radio access network node has insufficient buffer space.
The device according to claim 47 or 48, wherein the determining module is specifically configured to configure the target UE to be in a connected state discontinuous reception DRX mode.
The device according to claim 49, wherein the second sending module comprises:

a first receiving unit, configured to receive, by the mobility management entity, a first request message for requesting to notify the target UE to stop the DRX mode;

a first sending unit, configured to notify the target UE to stop the DRX mode, and determine the When the target UE stops the DRX mode, sending, to the mobility management entity, the second indication message indicating that the target UE has stopped the DRX mode, so that the mobility management entity informs the service gateway The target UE can receive downlink data.
The device according to claim 49, wherein the no second sending module comprises:

a second receiving unit, configured to receive a second request message that is sent by the mobility management entity to request that the target UE can receive time information of downlink data;

a second sending unit, configured to send, to the mobility management entity, the second indication message that includes time information that the target UE can receive downlink data, so that the mobility management entity sends the location information to the serving gateway The time information is used to facilitate the serving gateway to send downlink data to the target UE if the target UE is capable of receiving downlink data.
The device according to claim 51, wherein the time information that the target UE is capable of receiving downlink data is discontinuous reception DRX information of the target UE.