CN109246816A - A kind of method and apparatus transmitting downlink data - Google Patents

Abstract

The present invention relates to wireless communication technology field, in particular to a kind of method and apparatus for transmitting downlink data will cause the loss of downlink data to solve the problem of the prior art when transmitting the downlink data of UE of RRC inactive state.Source of embodiment of the present invention access network node receives the downlink data for the terminal that core net node is sent；Wherein, source access network node is that terminal enters the access network node accessed before RRC Inactive state from RRC Connected state；If source access network node can not page terminal, the downlink data of terminal is returned to core net node by the source access network node, so that core net node passes through the downlink data of other access network node transmission terminals.So as to avoid the loss of the downlink data of terminal, packet loss is reduced.

Description

A kind of method and apparatus transmitting downlink data

Technical field

The present invention relates to wireless communication technology field, in particular to a kind of method and apparatus for transmitting downlink data.

Background technique

It is in LTE (Long Term Evolution, long term evolution) system UE (User Equipment, user equipment) Define two kinds of RRC (Radio Resource Control, wireless heterogeneous networks) state: RRC Idle (free time) state and RRC Connected (connection) state.When UE needs to carry out business, UE needs to establish to be connect with the RRC of network, i.e., from the free time State is transformed into connected state, then just can be carried out the transmission of business datum.

UE can generate more signaling overheads during being transformed into connected state from Idle state, and conversion time is too long, Cause data transmission delay excessive.Next generation network is the upgrade version of LTE system, is capable of providing transmission more higher than LTE system Rate, next generation network are also referred to as 5G.In next generation network, a kind of new RRC state: RRC Inactive is introduced for UE (inactive) state, while UE also keeps RRC Idle state and RRC Connected state in LTE system.

RRC inactive state is the intermediate state of RRC idle state and RRC connected state, from core net From the point of view of, CM-Connected state is in core net in the UE that rrc layer is in RRC inactive state.UE is in RRC Conversion between connected state and RRC inactive state is transparent to core net, which will not generate core The signaling of heart net.When UE is in RRC inactive state, RAN (Radio Access Network, wireless access network) and There are still control planes and user face between core net, therefore core net does not need paging UE.

The feature of RRC inactive state is as follows:

1, UE and core net think that it is in CM-Connected state；

2, can be according to the demand of the application run in UE, the activity contracted with UE configures RRC inactive shape in UE State；

3, UE mobile process is triggered by cell reselection, does not support the switching of network-control；

4, when UE moves out the region of registration, UE initiates registration process to core net；

5, access layer context is stored in RAN and UE；

6, it hangs up and recovery process is used to support to turn between RRC inactive state and RRC connected state It changes, it may be necessary to AS (Application Server, application server) context is transmitted between RAN node；

7, the user plane established between RAN and core net is kept to connect with control plane；

8, RAN manages UE accessibility under the assistance of core net；

9, RAN manages UE paging；

10, CN is transferred to CM-Idle state according to the request of RAN.

For being in the UE of RRC inactive state, when core net needs to send the data of the UE to the UE, core Netcom crosses UE and enters the RAN node (hereinafter referred to as source RAN node) accessed before RRC inactive state, and the data of the UE are sent out UE is given, still, if UE has moved out the coverage area of source RAN node at this time, source RAN node can not in the coverage area of itself The UE is paged, then source RAN node abandons the data of the UE, therefore, at present the UE's of transmission RRC inactive state When downlink data, the loss of downlink data will cause.

In conclusion will cause downlink data when transmitting the downlink data of UE of RRC inactive state at present It loses.

Summary of the invention

The present invention provides a kind of method and apparatus for transmitting downlink data, to solve the prior art in transmission RRC When the downlink data of the UE of inactive state, the problem of will cause the loss of downlink data.

Based on the above issues, the embodiment of the present invention provides a kind of method for transmitting downlink data, comprising:

Source access network node receives the downlink data for the terminal that core net node is sent；Wherein, the source access network node Enter the access network node accessed before RRC Inactive state from RRC Connected state for the terminal；

If the source access network node can not page the terminal, the source access network node will be under the terminal Row data return to the core net node, so that the core net node transmits the terminal by other access network nodes Downlink data.

Optionally, the downlink data of the terminal is returned to the core net node by the source access network node, comprising:

The source access network node sends the paging request of the downlink data comprising the terminal to the core net node Message, so that the core net node is passed after paging to the terminal by sending the access network node of page-response message The downlink data of the defeated terminal.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, this method further include:

The source access network node determines that the terminal enters RRC Inactive state from RRC Connected state Afterwards, terminal described in the core net node is notified to enter RRC Inactive state.

Optionally, when meeting following condition, the source access network node determines the terminal from RRC Connected shape State enters RRC Inactive state:

The permission terminal that the source access network node receives the core net node notice enters RRC The prompt information of Inactive state；And/or

The source access network node determines the terminal in preset duration without sending and receiving data.

Optionally, enter in the permission terminal that the source access network node receives the core net node notice Before the prompt information of RRC Inactive state, further includes:

The source access network node will be used to that the core net node to be assisted to determine whether that the terminal enters RRC First reference information of Inactive state is sent to the core net node.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

On the other hand, the embodiment of the present invention also provides a kind of method for transmitting downlink data, comprising:

Core net node sends the downlink data of terminal to source access network node；Wherein, the source access network node is institute It states terminal and enters the access network node accessed before RRC Inactive state from RRC Connected state；

If receiving the downlink data for the terminal that the source access network node returns, the core net node passes through Other access network nodes transmit the downlink data of the terminal；Wherein, the downlink data of the terminal is to access net in the source Node returns to the core net node after can not paging the terminal.

Optionally, the core net node transmits the downlink data of the terminal by other access network nodes, comprising:

The paging that the core net node receives the downlink data comprising the terminal that the access network node is sent is asked Seek message；

The core net node pages the terminal according to the paging request message；

If receiving the page-response message that the terminal is returned by access network node, the core net node passes through The access network node for sending the page-response message transmits the downlink data of the terminal.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, this method further include:

The core net node determines whether the terminal according to the first reference information and/or the second reference information Enter RRC Inactive state from RRC Connected state；

After determining that the permission terminal enters RRC Inactive state, the core net node accesses net to the source Node sends the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；

Wherein, first reference information is the source access network node transmission for assisting the core net node to sentence The disconnected information for whether allowing the terminal to enter RRC Inactive state；Second reference information is the core net control What node was obtained from itself is used to determine whether that the terminal enters the information of RRC Inactive state.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Optionally, second reference information includes some or all of in following message:

The signing information of the terminal, local policy.

The third aspect, the embodiment of the present invention provide a kind of source access network node for transmitting downlink data, comprising:

Receiving module, the downlink data of the terminal for receiving core net node transmission；Wherein, the source access network node Enter the access network node accessed before RRC Inactive state from RRC Connected state for the terminal；

First transmission module, if the downlink data of the terminal is returned to institute for the terminal can not to be paged Core net node is stated, so that the core net node transmits the downlink data of the terminal by other access network nodes.

Optionally, first transmission module, is specifically used for:

The paging request message that the downlink data comprising the terminal is sent to the core net node, so that the core Net node transmits the downlink of the terminal by sending the access network node of page-response message after paging to the terminal Data.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, the receiving module, is also used to:

After determining that the terminal enters RRC Inactive state from RRC Connected state, the core net is notified Terminal described in node enters RRC Inactive state.

Optionally, the receiving module, is specifically used for:

When meeting following condition, determine that the terminal enters RRC Inactive state from RRC Connected state:

The permission terminal for receiving the core net node notice enters the prompt information of RRC Inactive state； And/or

Determine the terminal in preset duration without sending and receiving data.

Optionally, the receiving module, is also used to:

Believe in the prompt that the permission terminal for receiving the core net node notice enters RRC Inactive state It before breath, will be used to that the core net node to be assisted to determine whether that the terminal enters the first of RRC Inactive state Reference information is sent to the core net node.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Fourth aspect, the embodiment of the present invention provide a kind of core net node for transmitting downlink data, comprising:

Sending module, for sending the downlink data of terminal to source access network node；Wherein, the source access network node is The terminal enters the access network node accessed before RRC Inactive state from RRC Connected state；

Second transmission module, if the downlink data for receiving the terminal that the source access network node returns, The downlink data of the terminal is transmitted by other access network nodes；Wherein, the downlink data of the terminal is connect in the source Network access node returns to the core net node after can not paging the terminal.

Optionally, second transmission module, is specifically used for:

Receive the paging request message for the downlink data comprising the terminal that the access network node is sent；According to described Paging request message pages the terminal；If receiving the terminal to disappear by the page response that access network node returns Breath then transmits the downlink data of the terminal by sending the access network node of the page-response message.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, the sending module, is also used to:

According to the first reference information and/or the second reference information, determine whether the terminal from RRC Connected State enters RRC Inactive state；After determining that the permission terminal enters RRC Inactive state, connect to the source Network access node sends the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；Wherein, first reference Information is the source access network node transmission for assisting the core net node to determine whether that the terminal enters RRC The information of Inactive state；Second reference information is that the judgement that is used for that the core network control node is obtained from itself is The no information for allowing the terminal to enter RRC Inactive state.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Optionally, second reference information includes some or all of in following message:

The signing information of the terminal, local policy.

After the downlink data for receiving the terminal that core net node is sent due to source of embodiment of the present invention access network node, in source When access network node can not page terminal, the downlink data of terminal is returned into core net, core net is made to provide other accesses The downlink data of net node transmission terminal again reduces packet loss so as to avoid the loss of the downlink data of terminal.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this For the those of ordinary skill in field, without any creative labor, it can also be obtained according to these attached drawings His attached drawing.

For the embodiment of the present invention, the first transmits the structural schematic diagram of the system of downlink data to Fig. 1；

Fig. 2 is the structural schematic diagram of the system of second of embodiment of the present invention transmission downlink data；

Fig. 3 is the flow chart that the embodiment of the present invention transmits downlink data；

Fig. 4 is the overall flow figure that system of the embodiment of the present invention transmits downlink data；

Fig. 5 be core net node of the embodiment of the present invention determine whether the terminal from RRC Connected state into Enter the flow chart of RRC Inactive state；

Fig. 6 be core net node of the embodiment of the present invention determine whether the terminal from RRC Connected state into Enter the flow chart of RRC Inactive state；

Fig. 7 is the source access network node of the first transmission downlink data of the embodiment of the present invention；

Fig. 8 is the core net node of the first transmission downlink data of the embodiment of the present invention；

Fig. 9 is the source access network node of second of embodiment of the present invention transmission downlink data；

Figure 10 is the core net node of second of embodiment of the present invention transmission downlink data；

Figure 11 is the method flow diagram of the first transmission downlink data of the embodiment of the present invention；

Figure 12 is the method flow diagram of second of embodiment of the present invention transmission downlink data.

Specific embodiment

The source access network node of the embodiment of the present invention receives the downlink data for the terminal that core net node is sent；Wherein, institute Stating source access network node is that the terminal enters the access net accessed before RRC Inactive state from RRC Connected state Node；If the source access network node can not page the terminal, the source access network node is by the downlink of the terminal Data return to the core net node, so that the core net node is transmitted under the terminal by other access network nodes Row data.After the downlink data for receiving the terminal that core net node is sent due to source of embodiment of the present invention access network node, in source When access network node can not page terminal, the downlink data of terminal is returned into core net, core net is made to provide other accesses The downlink data of net node transmission terminal again reduces packet loss so as to avoid the loss of the downlink data of terminal.

Wherein, the data of transmission of the embodiment of the present invention can also be that core net needs to be sent to the signaling of terminal, in this hair It is not distinguished in bright embodiment, is referred to as the downlink data of terminal.

To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into It is described in detail to one step, it is clear that the described embodiments are only some of the embodiments of the present invention, rather than whole implementation Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts All other embodiment, shall fall within the protection scope of the present invention.

In following declarative procedure, it is illustrated from the cooperation of access network node side and core net node side implementation, but This is not meant to that the two must cooperate implementation, in fact, when access network node side and core net node side are performed separately, Solving can obtain more when only the two is used in combination in the problems of access network node side, core net node side respectively Good technical effect.

As shown in Figure 1, a kind of system for transmitting downlink data of the embodiment of the present invention, including source access network node 10 and core Net node 11.

Source access network node 10, the downlink data of the terminal for receiving core net node transmission；If institute can not be paged Terminal is stated, then the downlink data of the terminal is returned into the core net node, so that the core net node passes through other Access network node transmits the downlink data of the terminal；

Core net node 11, for sending the downlink data of terminal to source access network node；If receiving the source access The downlink data for the terminal that net node returns, then transmit the downlink data of the terminal by other access network nodes.

Wherein, the source access network node enters RRC Inactive shape from RRC Connected state for the terminal The access network node accessed before state.

It should be noted that the core net node of the embodiment of the present invention can be AMF (Authentication Management Function, authentication management function) equipment, or the other equipment positioned at core net node.

Optionally, as shown in Fig. 2, the system of the embodiment of the present invention further include: terminal 12.

Wherein, terminal 12 is in RRC Inactive state.Also, terminal 12 accesses before entering RRC Inactive state Access network node be source access network node 10.

When core net node 11 needs to send downlink data to terminal 12, core net node 11 is by the lower line number of terminal 12 According to being sent to source access network node 10；After the downlink data that source access network node 10 receives terminal 12, source access network node 10 page terminal 12 in itself coverage area.At this point, if terminal 12 removes the coverage area of source access network node 10, Source access network node 10 can not page terminal 12, then the downlink data of terminal is returned to core net node by access network node 10 11。

Optionally, the source access network node sends seeking for the downlink data comprising the terminal to the core net node Exhale request message.

Specifically, the downlink data of terminal is placed in paging request message by source access network node is sent to core net section Point.

It wherein, further include the contextual information of terminal in paging request message.

Correspondingly, core net node receives seeking for the downlink data comprising the terminal that the source access network node is sent Exhale request message；The core net node pages the terminal according to the paging request message；If receiving described The page-response message that terminal is returned by access network node, then the core net node is by sending the page-response message Access network node transmit the downlink data of the terminal.

Specifically, core net node is after receiving paging request message, according to the upper of the terminal in paging request message Context information pages terminal；Terminal after receiving the paging message of access network node, by the access network node to Core net node returns to page-response message.

Optionally, the page-response message in the embodiment of the present invention is that terminal is sent out by access network node to core net node The business request information sent.

It should be noted that source access network node needs to delete end after sending paging request message to core net node The contextual information at end.The contextual information of terminal can be specifically deleted using following two ways:

Mode 1, core net node are after receiving source access network node and sending paging request message, to source access network node Send the request for initiating to delete the contextual information of terminal；Source access network node simultaneously returns to confirmation message to core net node.

Mode 2, source access network node start a timer after sending paging request message to core net node, After timer expiry, source access network node deletes the contextual information of terminal.

For ease of description, the access network node for sending page-response message is known as target access in the embodiment of the present invention Net node.

Since the terminal of that embodiment of the invention returns to page-response message to core net node by target access network node, then Illustrate that terminal is currently located at the coverage area of target access network node.

As shown in figure 3, the flow chart of transmission downlink data of the embodiment of the present invention.

The downlink data for the terminal that step 301, core net node are sent to source access network node；

Wherein, source access network node is to access before terminal enters RRC Inactive state from RRC Connected state Access network node；

Step 302, source the access network node call terminal in itself coverage area；

Step 303, source access network node determination can not page terminal；

Step 304, source access network node send the paging of the downlink data comprising the terminal to the core net node Request message；

Step 305, core net node send the request for initiating to delete the contextual information of terminal to source access network node；

Step 306, source access network node simultaneously return to confirmation message to core net node；

Step 307, core net node page the terminal according to the paging request message；

It should be noted that step 305 can be first carried out in the embodiment of the present invention, it is rear to execute step 307；Or it first carries out Step 307, step 306 is executed afterwards；Or step 305 and step 307 are performed simultaneously.

Step 308, terminal send business request information to core net node by target access network node；

The downlink data that step 309, core net node pass through terminal described in target access network node-node transmission.

It should be noted that being needed before the downlink data that core net node passes through target access network node-node transmission terminal Progress RRC connection reconfiguration between terminal and target access network node is wanted to set.

Specifically, core net node sends N2 request to target access network node；It include wherein following message in N2 request Some or all of in:

The downlink data of the contextual information of terminal, terminal.

Wherein, the contextual information for the terminal that N2 request includes is for carrying out RRC between terminal and target access network node Connection reconfiguration is set.

It should be noted that the process that RRC connection reconfiguration is set between terminal and target access network node is using existing The method of technology, in this not go into detail.

After the completion of RRC connection reconfiguration is set between terminal and target access network node, target access network node is by terminal Downlink data is sent to terminal.

The embodiment of the present invention is after the completion of RRC connection reconfiguration is set between terminal and target access network node, target access network Node also needs to send redirection request to core net node.

It should be noted that the redirection process of target access network node of the embodiment of the present invention is using the prior art Method, in this not go into detail.

Illustrate the method for the system transmission downlink data of the embodiment of the present invention with a specific embodiment below.

The embodiment of the present invention uses the downlink data of AMF transmission terminal；Source RAN node is terminal from RRC Connected State enters the RAN node accessed before RRC Inactive state；Target RAN node is the terminal when paging to terminal The RAN section that the RAN node and terminal used when returning to page-response message is accessed when receiving the downlink data of AMF transmission Point.

As shown in figure 4, the overall flow figure of the system transmission downlink data of the embodiment of the present invention.

Step 401, AMF send the downlink data of terminal to source RAN node；

Step 402, source the RAN node call terminal in itself coverage area；

Step 403, source RAN node can not page terminal, determine paging failure；

Step 404, source RAN send paging request message to AMF；

Wherein, the downlink data of the contextual information in the paging request message comprising terminal and terminal；

Step 405, AMF page terminal；

Step 406, terminal receive the paging message of target RAN node sending；

Step 407, terminal return to business request information to AMF by target RAN node；

Step 408, AMF send N2 request message to target RAN node；

Wherein, the downlink data of the contextual information in N2 request message comprising terminal and terminal；

RRC connection reconfiguration is carried out between step 409, terminal and target RAN node to set；

The downlink data of terminal is sent to terminal by step 410, target RAN node；

Step 411, target RAN node send redirection request to AMF；

It wherein, include PDU session id/SMF ID, N2 SM information in redirection request；It include target in N2 SM information The tunnel information of RAN node；

Step 412, AMF send redirection request to SMF；

It wherein, include N2 SM information in redirection request；

Step 413, SMF send connection to UPF and update request；

Wherein, it includes PDU session id, RAN node tunnel information in request that connection, which updates,；

Step 414, UPF send connection to SMF and update confirmation message；

Step 415, SMF send redirected validation message to AMF；

Step 416, AMF send redirected validation message to RAN.

On the other hand, the system of the transmission downlink data of the embodiment of the present invention can also determine terminal from RRC Connected state enters RRC Inactive state.

The system of the transmission downlink data of the embodiment of the present invention is determining that terminal enters RRC from RRC Connected state When Inactive state, be by system core net node and source access network node determine jointly, be specifically described below.

First part, core net node determine whether that terminal enters RRC Inactive state.

Optionally, the source access network node will be used to assisting the core net node determine whether the terminal into The first reference information for entering RRC Inactive state is sent to the core net node；

Core net node determines whether the terminal from RRC according to the first reference information and/or the second reference information Connected state enters RRC Inactive state；After determining that the permission terminal enters RRC Inactive state, institute It states core net node and sends the prompt for indicating that the terminal is allowed to enter RRC Inactive state to the source access network node Information.

Wherein, first reference information is the source access network node transmission for assisting the core net node to sentence The disconnected information for whether allowing the terminal to enter RRC Inactive state；Second reference information is the core net control What node was obtained from itself is used to determine whether that the terminal enters the information of RRC Inactive state.

First reference information of the embodiment of the present invention includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Wherein, the RRC Inactive ability information of terminal is to give source access network node by terminal notification.

Specifically, terminal sends NAS message to the AMF for being located at core net, it include the RRC of terminal in the NAS message Inactive ability information.Wherein, NAS message can be login request message, can also be business request information.In implementation, NAS message is encapsulated in RRC information by terminal, and RRC information is sent to source access network node.

In source, access network node will be used to that the core net node to be assisted to determine whether that the terminal enters RRC When first reference information of Inactive state is sent to the core net node, can specifically following manner be used:

After source access network node receives the RRC information of terminal, the NAS message of terminal transmission is parsed from RRC information； The RRC Inactive ability information of NAS message and source access network node is placed in N2 message and is sent to core net node.Phase It answers, core net node obtains the RRC Inactive ability information of terminal and the RRC of source access network node from N2 message Inactive ability information.

Specifically, core net node of the embodiment of the present invention determines whether the terminal from RRC using following manner Connected state enters RRC Inactive state:

Optionally, core net node determines whether the end according to the first reference information and/or the second reference information End enters RRC Inactive state from RRC Connected state.

First reference information is that source access network node is sent to core net node；Second reference information is core net node It is obtained from itself.

First reference information includes some or all of in following message: the RRC Inactive ability information of terminal, source The RRC Inactive ability information of access network node；Second reference information includes some or all of in following message: terminal Signing information, local policy.

That is, core net node is determining whether that the terminal enters RRC from RRC Connected state When Inactive state, judged according to some or all of in following reference information:

The RRC Inactive ability information of terminal, the RRC Inactive ability information of source access network node, terminal Signing information, local policy.

Below for different reference informations, illustrating that core net node determines respectively allows terminal to enter RRC Inactive Each reference information needs the condition met when state.

1, the RRC Inactive ability information of terminal:

If core net node is determining whether that the terminal enters RRC Inactive from RRC Connected state Include the RRC Inactive ability information of terminal in the reference information of foundation when state, is determined described in permission in core net node When terminal enters RRC Inactive state from RRC Connected state, the RRC Inactive ability information of terminal needs The condition of satisfaction are as follows: the RRC Inactive ability information of terminal is that terminal supports RRC Inactive state.

2, the RRC Inactive ability information of source access network node:

If core net node is determining whether that the terminal enters RRC Inactive from RRC Connected state Include the RRC Inactive ability information of source access network node in the reference information of foundation when state, is determined in core net node When the terminal being allowed to enter RRC Inactive state from RRC Connected state, the RRC of source access network node Inactive ability information needs the condition met are as follows: the RRC Inactive ability information of source access network node is that net is accessed in source Node supports RRC Inactive state.

3, the signing information of terminal:

If core net node is determining whether that the terminal enters RRC Inactive from RRC Connected state It include the signing information of terminal in the reference information of foundation when state, determining in core net node allows the terminal from RRC When Connected state enters RRC Inactive state, the signing information of terminal needs the condition met are as follows: the signing of terminal Information is that terminal has been contracted RRC inactive state.

4, local policy:

If core net node is determining whether that the terminal enters RRC Inactive from RRC Connected state It include local policy in the reference information of foundation when state, determining in core net node allows the terminal from RRC When Connected state enters RRC Inactive state, local policy needs the condition met are as follows: terminal type is local plan The terminal type of RRC inactive state is allowed access into as defined in slightly.

If core net node determines whether that the terminal enters RRC Inactive shape from RRC Connected state When state in the reference information of foundation including multiple information, then when each information is all satisfied corresponding condition, core net node Determining allows the terminal to enter RRC Inactive state from RRC Connected state.

After determining that the permission terminal enters RRC Inactive state, the core net node accesses net to the source Node sends the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；

Correspondingly, the permission terminal that source access network node receives the core net node notice enters RRC The prompt information of Inactive state.

Specifically, core net node determines after allowing the terminal to enter RRC Inactive state, net section is accessed to source Point sends N2 message, and wherein the prompt in the N2 message comprising indicating that the terminal is allowed to enter RRC Inactive state is believed Breath.

As shown in figure 5, core net node of the embodiment of the present invention determines whether the terminal from RRC Connected shape State enters the flow chart of RRC Inactive state.

Step 501, terminal send RRC information to source RAN node；

Wherein, it is packaged with NAS message in the RRC information, and the RRC Inactive ability in NAS message comprising terminal is believed Breath；

Step 502, source RAN node send N2 message to AMF；

Wherein, in the N2 message include the RRC Inactive ability information of source RAN node, and be sent to comprising terminal The NAS message of source RAN node；

Step 503, AMF determine that permission terminal enters RRC Inactive state from RRC Connected state；

Step 504, AMF send N2 message to source RAN node；

Wherein, comprising indicating the prompt information for allowing the terminal to enter RRC Inactive state in the N2 message.

Second part, source access network node determine that terminal enters RRC Inactive state.

Optionally, the source access network node determines that the terminal enters RRC from RRC Connected state After Inactive state, terminal described in the core net node is notified to enter RRC Inactive state.

Source of embodiment of the present invention access network node determines that terminal enters from RRC Connected state using following manner RRC Inactive state:

When some or all of in meeting following condition, source access network node determines terminal from RRC Connected shape State enters RRC Inactive state:

The permission terminal that condition 1, source access network node receive the core net node notice enters RRC The prompt information of Inactive state；

Condition 2, source access network node determine the terminal in preset duration without sending and receiving data.

Wherein, the prompt information in condition 1, which is core net node, allows terminal to enter RRC Inactive state determining It is sent to source access network node afterwards.

Condition 2 can also be expressed as source access network node and determine that terminal is inactive in preset duration.For example, preset duration It is 1 hour, if source access network node determines terminal in 1 hour without sending and receiving data (or inactive), source access network node Release eats dishes without rice or wine to connect, and terminal enters RRC Inactive state.

Optionally, the permission terminal that access network node receives core net node notice in source enters RRC The prompt information of Inactive state, and when source access network node determines that the terminal does not have sending and receiving data in preset duration, Source access network node determines that terminal enters RRC Inactive state from RRC Connected state.

As shown in fig. 6, source of embodiment of the present invention access network node determines that terminal enters RRC from RRC Connected state The flow chart of Inactive state.

Step 601, source access network node determine that terminal enters RRC Inactive state from RRC Connected state；

Step 602, source access network node send RRC Inactive notification message to AMF；

It wherein, include the mark of terminal in the RRC Inactive notification message, for notifying AMF that terminal enters RRC Inactive state；

Step 603, AMF return to RRC Inactive confirmation message to source access network node.

Based on the same inventive concept, the embodiment of the invention also provides the source access net sections of the first transmission downlink data Point, the principle that access network node solves the problems, such as due to the source is similar to transmission of the embodiment of the present invention system of downlink data, The implementation of the source access network node may refer to the implementation of system, and overlaps will not be repeated.

As shown in fig. 7, the source access network node of the first transmission downlink data of the embodiment of the present invention, comprising:

Receiving module 701, the downlink data of the terminal for receiving core net node transmission；Wherein, net is accessed in the source Node is that the terminal enters the access network node accessed before RRC Inactive state from RRC Connected state；

First transmission module 702, if returning to the downlink data of the terminal for the terminal can not to be paged The core net node, so that the core net node transmits the downlink data of the terminal by other access network nodes.

Optionally, first transmission module 702, is specifically used for:

The paging request message that the downlink data comprising the terminal is sent to the core net node, so that the core Net node transmits the downlink of the terminal by sending the access network node of page-response message after paging to the terminal Data.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, the receiving module 701, is also used to:

After determining that the terminal enters RRC Inactive state from RRC Connected state, the core net is notified Terminal described in node enters RRC Inactive state.

Optionally, the receiving module 701, is specifically used for:

When meeting following condition, determine that the terminal enters RRC Inactive state from RRC Connected state:

The permission terminal for receiving the core net node notice enters the prompt information of RRC Inactive state； And/or

Determine the terminal in preset duration without sending and receiving data.

Optionally, the receiving module 701, is also used to:

Believe in the prompt that the permission terminal for receiving the core net node notice enters RRC Inactive state It before breath, will be used to that the core net node to be assisted to determine whether that the terminal enters the first of RRC Inactive state Reference information is sent to the core net node.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Based on the same inventive concept, the embodiment of the invention also provides the first transmission downlink data core net node, Since the principle that the core net node solves the problems, such as is similar to transmission of the embodiment of the present invention system of downlink data, the core The implementation of net node may refer to the implementation of system, and overlaps will not be repeated.

As shown in figure 8, the core net node of the first transmission downlink data of the embodiment of the present invention, comprising:

Sending module 801, for sending the downlink data of terminal to source access network node；Wherein, the source access net section Point is that the terminal enters the access network node accessed before RRC Inactive state from RRC Connected state；

Second transmission module 802, if the downlink data for receiving the terminal that the source access network node returns, The downlink data of the terminal is then transmitted by other access network nodes；Wherein, the downlink data of the terminal is in the source Access network node returns to the core net node after can not paging the terminal.

Optionally, second transmission module 802, is specifically used for:

Receive the paging request message for the downlink data comprising the terminal that the access network node is sent；According to described Paging request message pages the terminal；If receiving the terminal to disappear by the page response that access network node returns Breath then transmits the downlink data of the terminal by sending the access network node of the page-response message.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, the sending module 801, is also used to:

According to the first reference information and/or the second reference information, determine whether the terminal from RRC Connected State enters RRC Inactive state；After determining that the permission terminal enters RRC Inactive state, connect to the source Network access node sends the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；Wherein, first reference Information is the source access network node transmission for assisting the core net node to determine whether that the terminal enters RRC The information of Inactive state；Second reference information is that the judgement that is used for that the core network control node is obtained from itself is The no information for allowing the terminal to enter RRC Inactive state.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Optionally, second reference information includes some or all of in following message:

The signing information of the terminal, local policy.

As shown in figure 9, the source access network node of second of embodiment of the present invention transmission downlink data, comprising:

Processor 901 for sending and receiving data by transceiver 902, and reads the program in memory 904, holds The following process of row:

The downlink data for the terminal that core net node is sent is received by transceiver 902；Wherein, the source access network node Enter the access network node accessed before RRC Inactive state from RRC Connected state for the terminal；If can not seek The terminal is exhaled, then the downlink data of the terminal is returned into the core net node by transceiver 902, so that described Core net node transmits the downlink data of the terminal by other access network nodes.

Transceiver 902, for sending and receiving data under the control of processor 901.

Optionally, the processor 901, is specifically used for:

Disappeared by transceiver 902 to the paging request that the core net node sends the downlink data comprising the terminal Breath, so that the core net node is transmitted after paging to the terminal by sending the access network node of page-response message The downlink data of the terminal.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, the processor 901, is also used to:

After determining that the terminal enters RRC Inactive state from RRC Connected state, the core net is notified Terminal described in node enters RRC Inactive state.

Optionally, the processor 901, is specifically used for:

When meeting following condition, determine that the terminal enters RRC Inactive state from RRC Connected state:

The permission terminal for receiving the core net node notice enters the prompt information of RRC Inactive state； And/or

Determine the terminal in preset duration without sending and receiving data.

Optionally, the processor 901, is also used to:

Enter RRC Inactive in the permission terminal for receiving the core net node notice by transceiver 902 It before the prompt information of state, will be used to that the core net node to be assisted to determine whether that the terminal enters RRC First reference information of Inactive state is sent to the core net node.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Wherein, the interaction between the interaction between processor 901 and terminal and processor 901 and core net node is all It is to be carried out by transceiver 902.

In Fig. 9, bus architecture (is represented) with bus 900, and bus 900 may include the bus of any number of interconnection And bridge, the memory that bus 900 will include the one or more processors represented by processor 901 and memory 904 represents Various circuits link together.Bus 900 can also be by each of such as peripheral equipment, voltage-stablizer and management circuit or the like Other circuits of kind link together, and these are all it is known in the art, and therefore, it will not be further described herein. Bus interface 903 provides interface between bus 900 and transceiver 902.Transceiver 902 can be an element, be also possible to Multiple element, such as multiple receivers and transmitter, provide the unit for communicating over a transmission medium with various other devices. The data handled through processor 901 are transmitted on the radio medium by antenna 905, and further, antenna 905 also receives data And transfer data to processor 901.

Processor 901 is responsible for management bus 900 and common processing, can also provide various functions, including timing, periphery Interface, voltage adjusting, power management and other control functions.And memory 904 can be used for storage processor 901 and hold Used data when row operation.

Optionally, processor 901 can be CPU (centre buries device), ASIC (Application Specific Integrated Circuit, specific integrated circuit), (Field-Programmable Gate Array, scene can compile FPGA Journey gate array) or CPLD (Complex Programmable Logic Device, Complex Programmable Logic Devices).

As shown in Figure 10, the core net node of second of embodiment of the present invention transmission downlink data, comprising:

Processor 1001 for sending and receiving data by transceiver 1002, and reads the program in memory 1004, Execute following process:

The downlink data of terminal is sent to source access network node by transceiver 1002；Wherein, the source access network node Enter the access network node accessed before RRC Inactive state from RRC Connected state for the terminal；If receiving The downlink data for the terminal that the source access network node is returned by transceiver 1002, then passed by other access network nodes The downlink data of the defeated terminal；Wherein, the downlink data of the terminal is can not to page institute in the source access network node The core net node is returned to after stating terminal.

Transceiver 1002, for sending and receiving data under the control of processor 1001.

Optionally, the processor 1001, is specifically used for:

Receive the paging request message for the downlink data comprising the terminal that the access network node is sent；According to described Paging request message pages the terminal；If receiving the terminal to disappear by the page response that access network node returns Breath then transmits the downlink data of the terminal by sending the access network node of the page-response message.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, processor 1001 are also used to:

According to the first reference information and/or the second reference information, determine whether the terminal from RRC Connected State enters RRC Inactive state；After determining that the permission terminal enters RRC Inactive state, pass through transceiver 1002 send the prompt information for indicating that the terminal is allowed to enter RRC Inactive state to the source access network node；Its In, first reference information is the source access network node transmission for assisting the core net node to determine whether The terminal enters the information of RRC Inactive state；Second reference information be the core network control node from itself What is obtained is used to determine whether that the terminal enters the information of RRC Inactive state.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Optionally, second reference information includes some or all of in following message:

The signing information of the terminal, local policy.

Wherein, the friendship between the interaction between processor 1001 and terminal and processor 1001 and source access network node It is mutually carried out by transceiver 1002.

In Figure 10, bus architecture (is represented) with bus 1000, and bus 1000 may include any number of interconnection Bus and bridge, bus 1000 will include the one or more processors represented by processor 1001 and what memory 1004 represented deposits The various circuits of reservoir link together.Bus 1000 can also will peripheral equipment, voltage-stablizer and management circuit etc. Etc various other circuits link together, these are all it is known in the art, therefore, herein no longer carries out it into one Step description.Bus interface 1003 provides interface between bus 1000 and transceiver 1002.Transceiver 1002 can be a member Part is also possible to multiple element, such as multiple receivers and transmitter, provide for over a transmission medium with various other devices The unit of communication.The data handled through processor 1001 are transmitted on the radio medium by antenna 1005, further, antenna 1005 also receive data and transfer data to processor 1001.

Processor 1001 is responsible for management bus 1000 and common processing, can also provide various functions, including timing, outside Enclose interface, voltage adjusting, power management and other control functions.And memory 804 can be used for storage processor 1001 The used data when executing operation.

Optionally, processor 1001 can be CPU (centre buries device), ASIC (Application Specific Integrated Circuit, specific integrated circuit), (Field-Programmable Gate Array, scene can compile FPGA Journey gate array) or CPLD (Complex Programmable Logic Device, Complex Programmable Logic Devices).

Based on the same inventive concept, the embodiment of the invention also provides the methods of the first transmission downlink data, due to this The principle that method solves the problems, such as is similar to transmission of the embodiment of the present invention system of downlink data, therefore the implementation of this method can be joined See the implementation of system, overlaps will not be repeated.

As shown in figure 11, the first transmission downlink data of the embodiment of the present invention includes:

Step 1101, source access network node receive the downlink data for the terminal that core net node is sent；Wherein, the source connects Network access node is that the terminal enters the access network node accessed before RRC Inactive state from RRC Connected state；

If step 1102, the source access network node can not page the terminal, the source access network node is by institute The downlink data for stating terminal returns to the core net node, so that the core net node is transmitted by other access network nodes The downlink data of the terminal.

Optionally, the downlink data of the terminal is returned to the core net node by the source access network node, comprising:

The source access network node sends the paging request of the downlink data comprising the terminal to the core net node Message, so that the core net node is passed after paging to the terminal by sending the access network node of page-response message The downlink data of the defeated terminal.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, this method further include:

The source access network node determines that the terminal enters RRC Inactive state from RRC Connected state Afterwards, terminal described in the core net node is notified to enter RRC Inactive state.

Optionally, when meeting following condition, the source access network node determines the terminal from RRC Connected shape State enters RRC Inactive state:

The permission terminal that the source access network node receives the core net node notice enters RRC The prompt information of Inactive state；And/or

The source access network node determines the terminal in preset duration without sending and receiving data.

Optionally, enter in the permission terminal that the source access network node receives the core net node notice Before the prompt information of RRC Inactive state, further includes:

The source access network node will be used to that the core net node to be assisted to determine whether that the terminal enters RRC First reference information of Inactive state is sent to the core net node.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Based on the same inventive concept, the embodiment of the invention also provides the methods of the first transmission downlink data, due to this The principle that method solves the problems, such as is similar to transmission of the embodiment of the present invention system of downlink data, therefore the implementation of this method can be joined See the implementation of system, overlaps will not be repeated.

As shown in figure 12, second of transmission downlink data of the embodiment of the present invention includes:

Step 1201, core net node send the downlink data of terminal to source access network node；Wherein, net is accessed in the source Node is that the terminal enters the access network node accessed before RRC Inactive state from RRC Connected state；

If step 1202, the downlink data for receiving the terminal that the source access network node returns, the core Net node transmits the downlink data of the terminal by other access network nodes；Wherein, the downlink data of the terminal is in institute The source access network node of stating returns to the core net node after can not paging the terminal.

Optionally, the core net node transmits the downlink data of the terminal by other access network nodes, comprising:

The paging that the core net node receives the downlink data comprising the terminal that the access network node is sent is asked Seek message；

The core net node pages the terminal according to the paging request message；

If receiving the page-response message that the terminal is returned by access network node, the core net node passes through The access network node for sending the page-response message transmits the downlink data of the terminal.

Optionally, the page-response message is the business request information that the terminal is sent by access network node.

Optionally, this method further include:

The core net node determines whether the terminal according to the first reference information and/or the second reference information Enter RRC Inactive state from RRC Connected state；

After determining that the permission terminal enters RRC Inactive state, the core net node accesses net to the source Node sends the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；

Wherein, first reference information is the source access network node transmission for assisting the core net node to sentence The disconnected information for whether allowing the terminal to enter RRC Inactive state；Second reference information is the core net control What node was obtained from itself is used to determine whether that the terminal enters the information of RRC Inactive state.

Optionally, first reference information includes some or all of in following message:

The RRC Inactive ability information of the terminal, the RRC Inactive ability of source access network node letter Breath.

Optionally, second reference information includes some or all of in following message:

The signing information of the terminal, local policy.

It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more, The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces The form of product.

The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.

Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (26)

1. a kind of method for transmitting downlink data, which is characterized in that this method comprises:

Source access network node receives the downlink data for the terminal that core net node is sent；Wherein, the source access network node is institute It states terminal and enters the access accessed before the inactive Inactive state of RRC from radio resource control RRC connection Connected state Net node；

If the source access network node can not page the terminal, the source access network node is by the lower line number of the terminal According to the core net node is returned to, so that the core net node transmits the downlink of the terminal by other access network nodes Data.

2. the method as described in claim 1, which is characterized in that the source access network node returns the downlink data of the terminal Back to the core net node, comprising:

The source access network node sends the paging request message of the downlink data comprising the terminal to the core net node, So that the core net node passes through the access network node transmission institute for sending page-response message after paging to the terminal State the downlink data of terminal.

3. method according to claim 2, which is characterized in that the page-response message is that the terminal passes through access net section The business request information that point is sent.

4. the method as described in claim 1, which is characterized in that this method further include:

After the source access network node determines that the terminal enters RRC Inactive state from RRC Connected state, lead to Know that terminal described in the core net node enters RRC Inactive state.

5. method as claimed in claim 4, which is characterized in that when meeting following condition, the source access network node is determined The terminal enters RRC Inactive state from RRC Connected state:

The permission terminal that the source access network node receives the core net node notice enters RRC Inactive shape The prompt information of state；And/or

The source access network node determines the terminal in preset duration without sending and receiving data.

6. method as claimed in claim 5, which is characterized in that receive the core net node in the source access network node The permission terminal of notice enters before the prompt information of RRC Inactive state, further includes:

The source access network node will be used to that the core net node to be assisted to determine whether that the terminal enters RRC First reference information of Inactive state is sent to the core net node.

7. method as claimed in claim 6, which is characterized in that first reference information include part in following message or All:

RRC Inactive ability information, the RRC Inactive ability information of the source access network node of the terminal.

8. a kind of method for transmitting downlink data, which is characterized in that this method comprises:

Core net node sends the downlink data of terminal to source access network node；Wherein, the source access network node is the end End enters the access net section accessed before the inactive Inactive state of RRC from radio resource control RRC connection Connected state Point；

If receiving the downlink data for the terminal that the source access network node returns, the core net node passes through other Access network node transmits the downlink data of the terminal；Wherein, the downlink data of the terminal is in the source access network node The core net node is returned to after the terminal can not be paged.

9. method according to claim 8, which is characterized in that the core net node transmits institute by other access network nodes State the downlink data of terminal, comprising:

The paging request that the core net node receives the downlink data comprising the terminal that the access network node is sent disappears Breath；

The core net node pages the terminal according to the paging request message；

If receiving the page-response message that the terminal is returned by access network node, the core net node passes through transmission The access network node of the page-response message transmits the downlink data of the terminal.

10. method as claimed in claim 9, which is characterized in that the page-response message is that the terminal passes through access net The business request information that node is sent.

11. method according to claim 8, which is characterized in that this method further include:

The core net node determines whether the terminal from RRC according to the first reference information and/or the second reference information Connected state enters RRC Inactive state；

After determining the terminal is allowed to enter RRC Inactive state, the core net node is to the source access network node Send the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；

Wherein, first reference information is that the core net node judgement that is used to assist that the source access network node is sent is The no information for allowing the terminal to enter RRC Inactive state；Second reference information is the core network control node What is obtained from itself is used to determine whether that the terminal enters the information of RRC Inactive state.

12. method as claimed in claim 11, which is characterized in that first reference information includes the part in following message Or all:

RRC Inactive ability information, the RRC Inactive ability information of the source access network node of the terminal.

13. method as claimed in claim 11, which is characterized in that second reference information includes the part in following message Or all:

The signing information of the terminal, local policy.

14. a kind of source access network node for transmitting downlink data characterized by comprising

Receiving module, the downlink data of the terminal for receiving core net node transmission；Wherein, the source access network node is institute It states terminal and enters the access accessed before the inactive Inactive state of RRC from radio resource control RRC connection Connected state Net node；

First transmission module, if the downlink data of the terminal is returned to the core for the terminal can not to be paged Heart net node, so that the core net node transmits the downlink data of the terminal by other access network nodes.

15. source access network node as claimed in claim 14, which is characterized in that first transmission module is specifically used for:

The paging request message that the downlink data comprising the terminal is sent to the core net node, so that the core net section Point transmits the downlink data of the terminal by sending the access network node of page-response message after paging to the terminal.

16. source access network node as claimed in claim 15, which is characterized in that the page-response message is logical for the terminal Cross the business request information of access network node transmission.

17. source access network node as claimed in claim 14, which is characterized in that the receiving module is also used to:

After determining that the terminal enters RRC Inactive state from RRC Connected state, the core net node is notified The terminal enters RRC Inactive state.

18. source access network node as claimed in claim 17, which is characterized in that the receiving module is specifically used for:

When meeting following condition, determine that the terminal enters RRC Inactive state from RRC Connected state:

The permission terminal for receiving the core net node notice enters the prompt information of RRC Inactive state；With/ Or

Determine the terminal in preset duration without sending and receiving data.

19. source access network node as claimed in claim 18, which is characterized in that the receiving module is also used to:

The permission terminal for receiving core net node notice enter RRC Inactive state prompt information it Before, it will be used to that the core net node to be assisted to determine whether that the terminal enters the first reference of RRC Inactive state Information is sent to the core net node.

20. source access network node as claimed in claim 19, which is characterized in that first reference information includes following message Some or all of in:

RRC Inactive ability information, the RRC Inactive ability information of the source access network node of the terminal.

21. a kind of core net node for transmitting downlink data characterized by comprising

Sending module, for sending the downlink data of terminal to source access network node；Wherein, the source access network node is described Terminal enters the access net accessed before the inactive Inactive state of RRC from radio resource control RRC connection Connected state Node；

Second transmission module, if the downlink data for receiving the terminal that the source access network node returns, passes through Other access network nodes transmit the downlink data of the terminal；Wherein, the downlink data of the terminal is to access net in the source Node returns to the core net node after can not paging the terminal.

22. core net node as claimed in claim 21, which is characterized in that second transmission module is specifically used for:

Receive the paging request message for the downlink data comprising the terminal that the access network node is sent；According to the paging Request message pages the terminal；If receiving the page-response message that the terminal is returned by access network node, The downlink data of the terminal is then transmitted by sending the access network node of the page-response message.

23. core net node as claimed in claim 22, which is characterized in that the page-response message is that the terminal passes through The business request information that access network node is sent.

24. core net node as claimed in claim 21, which is characterized in that the sending module is also used to:

According to the first reference information and/or the second reference information, determine whether the terminal from RRC Connected state Into RRC Inactive state；After determining that the permission terminal enters RRC Inactive state, net is accessed to the source Node sends the prompt information for indicating that the terminal is allowed to enter RRC Inactive state；Wherein, first reference information It is the source access network node transmission for assisting the core net node to determine whether that the terminal enters RRC The information of Inactive state；Second reference information is that the judgement that is used for that the core network control node is obtained from itself is The no information for allowing the terminal to enter RRC Inactive state.

25. core net node as claimed in claim 24, which is characterized in that first reference information includes in following message Some or all of:

RRC Inactive ability information, the RRC Inactive ability information of the source access network node of the terminal.

26. core net node as claimed in claim 24, which is characterized in that second reference information includes in following message Some or all of:

The signing information of the terminal, local policy.