CN104185302B

CN104185302B - A kind of PDN connection managements method and apparatus

Info

Publication number: CN104185302B
Application number: CN201310201868.3A
Authority: CN
Inventors: 路杨
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-05-27
Filing date: 2013-05-27
Publication date: 2017-09-29
Anticipated expiration: 2033-05-27
Also published as: CN104185302A

Abstract

The invention discloses a kind of PDN connection managements method and apparatus, to simplify the signaling procedure switched between 3GPP and non-3 GPP system, reduce intersystem handover time delay.In the present invention, PDN Gateway equipment is needed to be switched to the PDN connections of the second network from first network during the second network attachment that the terminal for having accessed first network is initiated, according to the terminal, and PDN connections are set up in the second network；Wherein, need to share PDN connection contexts from the PDN connections that first network is switched to the second network described in the PDN connections set up in the second network and first network；The PDN Gateway equipment is according to the PDN connections set up in the second network, add the second network context in corresponding PDN connections context, and in the corresponding PDN connections context by first network labeled as the inactive network of the corresponding PDN connections, by activation network of second network identity for the corresponding PDN connections.

Description

A kind of PDN connection managements method and apparatus

Technical field

The present invention relates to wireless communication technology field, more particularly to a kind of connection management method and apparatus.

Background technology

Current 3GPP（3rd Generation Partnership Project, third generation partner program）Network and non-3GPP（Non-3 gpp）The various schemes of interoperability have been basically completed between network.

In order to support more preferable scalability, EPS（Evolved Packet System, evolved packet system）Support The access of 3GPP networks and non-3GPP networks and interoperability.The non-3GPP IP access networks of current credit by s2a or S2c interfaces interoperate with 3GPP real-time performances, and the non-3GPP IP access networks of non-credit pass through s2c or s2b interfaces and 3GPP Real-time performance interoperates.

In currently existing scheme, after the completion of switching between 3GPP networks and non-3GPP networks, by PGW（PDN Gateway, PDN Gateway）Initiate to PDN in original network（Packet Data Network, Packet Data Network）The release of connection.When PGW exists After releasing PDN connections in 3GPP networks, UE in the short time（User Equipment, user equipment, i.e. terminal）Need to cut When gaining 3GPP networks, it is necessary to initiate attachment again and PDN connections are set up.

The MAPCON in 3GPP R10 stages（Multiple Access PDN Connection, multiple access PDN connections）Skill Art can support the UE of a variety of access capabilities, and the IP connections of 3GPP networks and non-3GPP networks can be kept simultaneously.UE is simultaneously 2 Adhered in individual network, according to the strategy of operator, the selection of user or the characteristic of application, IP is flowed from different access networks It is route.

3GPP networks and the internetwork interoperability functions of non-3GPP are weaker in current standard.When UE is in non-3GPP nets When network and the edge of the 3GPP network coverages, or UE between two kinds of wireless networks when moving back and forth, or UE is according to network When congestion state carries out IP Route Selections and optimization, it may occur that UE toggles part PDN connections or institute between the two networks There is the situation of PDN connections.User toggles PDN connections in two networks can cause triggering PDN connections repeatedly to be set up and PDN The process of Connection Release, signaling procedure is cumbersome.

The content of the invention

The embodiments of the invention provide a kind of PDN connection managements method and apparatus, to simplify the operation of PDN connection managements.

PDN connection managements method provided in an embodiment of the present invention, including：

PDN Gateway equipment is during the second network attachment that the terminal for having accessed first network is initiated, according to the end End is needed to be switched to the PDN connections of the second network from first network, and PDN connections are set up in the second network；Wherein, in the second network Need to share PDN connections from the PDN connections that first network is switched to the second network described in the PDN connections of foundation and first network Context；

The PDN Gateway equipment is added according to the PDN connections set up in the second network in corresponding PDN connections context Second network context, and first network is labeled as the non-of the corresponding PDN connections in the corresponding PDN connections context Activate network, by the second network identity be the corresponding PDN connections activation network.

The PDN connection management methods that another embodiment of the present invention is provided, methods described includes：

During the second network attachment that terminal is initiated after access first network, it is switched to as needed from first network The PDN connections of second network, PDN connections are set up in the second network；Wherein, the PDN connections set up in the second network and the first net Need to share PDN connection contexts from the PDN connections that first network is switched to the second network described in network；

The terminal adds the second network according to the PDN connections set up in the second network in corresponding PDN connections context Context, and by inactive net of the first network labeled as the corresponding PDN connections in the corresponding PDN connections context Network, by the second network identity be the corresponding PDN connections activation network.

PDN Gateway equipment provided in an embodiment of the present invention, including：

PDN connection processing modules, for accessing during the second network attachment of terminal initiation of first network, root Need to be switched to the PDN connections of the second network from first network according to the terminal, PDN connections are set up in the second network；Wherein, exist Need to be switched to the PDN connections of the second network altogether from first network described in the PDN connections of second network foundation and first network With PDN connection contexts；

PDN connection context maintenance modules, for the PDN set up according to the PDN connection processing modules in the second network Connection, adds the second network context in corresponding PDN connections context, and by the in the corresponding PDN connections context One network identity is the inactive network of the corresponding PDN connections, by activation that the second network identity is the corresponding PDN connections Network.

Terminal device provided in an embodiment of the present invention, including：

PDN connection processing modules, for the second network attachment initiated in the terminal device after access first network During, the PDN connections of the second network are switched to from first network as needed, PDN connections are set up in the second network；Wherein, Need to be switched to the PDN connections of the second network from first network described in the PDN connections set up in the second network and first network Share PDN connection contexts；

In the above embodiment of the present invention, the PDN connections for needing to be switched to the second network from first network, second Network sets up PDN connections, needs to be switched to from first network described in the PDN connections set up due to the second network and first network The PDN connections of second network share PDN connection contexts, thus by corresponding PDN connections context by first network mark Be designated as the corresponding PDN connections inactive network, by the second network identity be the corresponding PDN connections activation network, area Divide PDN to be connected to the state in heterogeneous networks, realize the management to PDN connections.Due to setting up PDN connections in the second network Meanwhile, the release process of the PDN connections is not initiated in first network, therefore compared with prior art, simplify PDN connections Management operation.

Brief description of the drawings

Fig. 1 is the PDN connection management schematic flow sheets of UE sides provided in an embodiment of the present invention；

Fig. 2 is the PDN connection management schematic flow sheets for the PGW sides that the embodiment of the present invention passes through；

Fig. 3 is the PDN connection management schematic flow sheets that the embodiment of the present invention one is provided；

Fig. 4 is the PDN connection management schematic flow sheets that the embodiment of the present invention two is provided；

Fig. 5 is the PDN connection management schematic flow sheets that the embodiment of the present invention three is provided；

Fig. 6 is the PDN connection management schematic flow sheets that the embodiment of the present invention four is provided；

Fig. 7 is the PDN connection management schematic flow sheets that the embodiment of the present invention five is provided；

Fig. 8 is the structural representation for the PDN Gateway equipment that the embodiment of the present invention six is provided；

Fig. 9 is the structural representation for the terminal that the embodiment of the present invention seven is provided.

Embodiment

In order to solve UE moved between 3GPP networks and non-3GPP networks or other reasons caused by PDN connections switched Cheng Zhong, the problem of signaling process is complicated cumbersome, the embodiment of the present invention proposes a kind of PDN connection managements scheme.The present invention is implemented In example, the interactive supervision to multi-access network PDN connections can be realized in PGW sides or/and UE sides, is supported in PGW sides or/and UE Side safeguards that PDN is connected to the context in different access networks, and the switch instances connected according to PDN, by the way that target is accessed Network identity is labeled as inactive network for activation network, by source access network, and reservation source connects in the context of PDN connections Enter the context of network, PDN connections are set up in PDN connection handoff procedures in target access network, in source access network to reduce The complexity of the signaling processing caused by PDN connections is discharged in network.

The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1 and Fig. 2, the PDN connection management flow chart elements of PGW sides and UE sides respectively provided in an embodiment of the present invention Figure.Flow shown in Fig. 1 and Fig. 2 can be performed individually, can also be combined and be performed, i.e. can only need PGW according to Fig. 1 institutes The flow shown carries out PDN connection managements, either can only need UE according to the flow shown in Fig. 2 carry out PDN connection managements or PGW and UE carry out PDN connection managements according to the flow shown in Fig. 1 and Fig. 2 respectively.First network and the second net in below scheme Network refers to the accession to network respectively, such as first network can be 3GPP networks, and the second network can be non-3GPP networks, otherwise also So.First network or/and the second network can also be other types of access networks.

As shown in figure 1, the PDN connection management flows of PGW sides may include：

Step 101：PGW is during the second network attachment that the UE for having accessed first network is initiated, according to the UE needs The PDN connections of the second network are switched to from first network, PDN connections is set up in the second network, is connected to according to the PDN of foundation The second network context is added in the context of PDN connections；

Step 102：First network in the context that PGW connects the PDN is labeled as inactive network, and the PDN is connected The second network identity in the context connect is activation network.

As shown in Fig. 2 the PDN connection management flows of UE sides may include：

Step 201：During the second network attachment that UE is initiated after access first network, as needed from first network The PDN connections of the second network are switched to, PDN connections are set up in the second network, the upper of PDN connections is connected to according to the PDN of foundation Hereinafter add the second network context；

Step 202：First network in the context that the UE connects the PDN is labeled as inactive network, and the PDN is connected The second network identity in the context connect is activation network.

So that PGW and UE carry out PDN connection managements according to the flow shown in Fig. 1 and Fig. 2 respectively as an example, with reference to above-mentioned Fig. 1 and Flow shown in Fig. 2, its PDN connection management process is：UE has currently accessed first network, and sets up and have in first network PDN connections.According to the difference of the type of service of request, UE can set up corresponding in first network for different types of business PDN connections；Hereafter the UE is attached to the second network, during the second network attachment, and the UE, which is directed in first network, to be needed to cut The PDN connections of the second network are changed to, setting up in the second network in PDN connections, the first network needs to be switched to the second network PDN connections and the current PDN connections set up in the second network there is incidence relation, i.e., above and below shared same PDN connections Text；Set up in the second network after above-mentioned PDN connections, UE and PGW add the second network in the context of the PDN connections respectively First network in context, and the context that the PDN is connected is labeled as inactive network, is activation by the second network identity Network.PGW keeps the PDN connections being associated in first network, i.e. Bu Huili after the second network sets up above-mentioned PDN connections Initiate the release process to the PDN the being associated connections in first network.

By above procedure, the PDN connections for being switched to the second network from first network, actually in first network and PDN connection relevant bearers are all established in second network, simply first network is non-activation network for the PDN connections, Second network is activation network for the PDN connections.

In the downstream direction, when the downlink data for being sent to some UE reaches PGW, PGW is upper according to the PDN connections of the UE Network of the lower query text labeled as activation（Inquire about the activation network of the PDN connections）, according to swashing for the PDN connections inquired PCC corresponding to network living（Policy Control and Charging, policy control and charging）Rule is entered to downlink data Row filtering and carrying mapping, make downlink data by the PDN linkup transmits in the activation network to the UE.Accordingly, UE passes through PDN in the activation network receives the downlink data that PGW is sent.

In the upstream direction, UE adheres in 3GPP and non-3GPP networks simultaneously when, every PDN connection is safeguarded in UE Network context and inactive network context are activated, UE sends upstream data in the PDN connections of activation network.Accordingly, PGW receives the upstream data that the UE is sent by the PDN connections of the activation network.

Further, for the PDN connections in inactive network, PGW can select to delete radio bearer resources, and delete Except PCC rules or/and QoS（Quality of Service, service quality）Rule；It can also select to retain radio bearer money Source, and retain PCC rules or/and or QoS rules.

Further, in order to save network resource overhead, the embodiment of the present invention is for the PDN without data transfer for a long time Connection, can initiate PDN Connection Release processes, to discharge the Internet resources of PDN connections occupancy.It is preferred that, the present invention is implemented Example provides the mode that following two PDN connecting detections and resource discharge：

Mode one：Detection activates the PDN connections in network or/and inactive network respectively

When in the context of the PGW PDN connections preserved, while in the presence of the upper of the context and inactive network for activating network When hereafter, PGW can detect the data transfer that the PDN is connected in activation network or/and inactive network respectively.If should PDN, which is connected to set in duration in inactive network, does not have upstream data arrival, then PGW can be initiated for the PDN connections PDN Connection Release processes in inactive network, by the PDN Connection Release processes, UE and PGW delete the inactive network In PDN connections, and the inactive network in the PDN connection contexts context.Similarly, if the PDN is connected to There is no upstream data arrival in setting duration in activation network, then PGW can be initiated in activation network for the PDN connections PDN Connection Release processes, by the PDN Connection Release processes, UE and PGW delete the PDN connections in the activation network, with And the context of the activation network in the PDN connection contexts.

Mode two：Do not differentiate between activation network or inactive network is detected to PDN connections

When in the context of the PGW PDN connections preserved, while in the presence of the upper of the context and inactive network for activating network When hereafter, PGW can be directed to PDN connections（Activation network and inactive network are not differentiated between）Detected.If PGW is detected PDN, which is connected in setting duration, does not have data transfer, then PGW is directed to the PDN connections, in the activation network of the PDN connections and non- The release process to the PDN connections is initiated in activation network respectively.

Further, for the flow shown in Fig. 1, in order to which PDN connections are switched into the second network from first network in UE Afterwards, the PDN is kept to be connected to first network（It is currently inactive network）In carrying, in the embodiment of the present invention, when the first net When network has initiated empty port load-supporting release（Such as UE long-time non-activitys）If PGW judges to ask the resource of release to belong to the UE's Certain PDN is connected to the carrying of inactive network, then PGW does not discharge relevant bearer and PDN connections.When PGW is received for the first net Network（It is currently inactive network）Bearing modification request indicate bottom carrying when setting up, if in correlation PDN connection contexts First network is marked as inactive network, then is set to activate network again, is inactive network by the second network identity.

Further, for the flow shown in Fig. 2, in order to which PDN connections are switched into the second network from first network in UE Afterwards, keep the PDN to be connected in the carrying in first network, the embodiment of the present invention, initiated empty port load-supporting when first network and released When putting（Such as UE long-time non-activitys）If UE judges that certain PDN for asking the resource discharged to belong to the UE is connected to inactive net The carrying of network, then the UE do not discharge relevant bearer and PDN connections.

Further, it is contemplated that UE is directed to first network（Such as 3GPP networks）With the second network（Such as non-3GPP networks）Have Two sets of independent transceivers, can be same when UE shuts down in the case where UE is registered in first network and the second network simultaneously When to the two networks send de-registration request（Nullify completely）.If simply needing to nullify in wherein one network, UE makes Network controller initiation log off procedure of the equipment to the network is sent with corresponding.

Further, access first network then in UE and be attached to the second network, and by the PDN connections of first network It is switched to after the second network, can will be also switched to the second network（Current is activation network）PDN connections switch back into first network （It is currently inactive network）.According to PDN connection contexts and radio bearer situation, it may include following switch instances：

Situation 1：UE is needing specified PDN connections being switched to inactive network from activation network, and this specifies PDN connections Context in there is inactive network context, but this specifies PDN to be connected in current inactive network does not have radio bearer When, this is specified PDN to connect by the expansion service request or tracing section updating request or Routing Area Update request of initiation wherein carrying It is connected on the configured information of the bearing activation of current inactive network；This is specified the context Central Plains of PDN connections inactive by the UE Network identity is the currently active network, former activation network labeled as current inactive network.

PGW receives the request modified to the carrying of the specified PDN connections of 3GPP equipments of the core network transmission, according to The carrying of PDN connections is specified in request modification；PGW is if it is determined that ask the network where the carrying of modification to be to specify PDN connections Inactive network, then the inactive network identity in context Central Plains connected specified PDN is the currently active network, former activation network Network is labeled as current inactive network.

Situation 2：UE is needing specified PDN connections being switched to inactive network from activation network, and this specifies PDN connections Context in when inactive network context is not present, initiate to specify the inactive network of PDN connections to set up the finger at this Determine the request of PDN connections；The UE is after this specifies the inactive network of PND connections to set up the specified PDN connections, in PDN connections The context of network where the PDN is connected to is added in context, and by the former inactive network identity in PDN connection contexts Current inactive network is labeled as the currently active network, former activation network.

PGW receives the request for setting up PDN connections that UE is initiated, and PDN connections are set up according to the request being currently received；If building There is no the PDN to be connected to the context of place network in the context of vertical PDN connections, and PDN connections place network is not The activation network of the PDN connections, then be connected in PDN connection contexts according to the PDN of foundation and add net where the PDN is connected to The context of network, and be the currently active network, former activation network identity by the former inactive network identity in PDN connection contexts For current inactive network.

Situation 3：UE need by specified PDN connections from activate network（3GPP networks）It is switched to inactive network（non- 3GPP networks）, and this specifies and there is inactive network context in the context of PDN connections, and the specified PDN be connected to it is non- When there is radio bearer in activation network, pass through the specified PDN linkup transmits upstream data in inactive network;UE ought Former inactive network identity in the context of the preceding PDN connections for sending upstream data is the currently active network, former activation network Labeled as current inactive network.

UE need by specified PDN connections from activate network（Non-3GPP networks）It is switched to inactive network（3GPP nets Network）, and this is specified when there is inactive network context in the context of PDN connections, by inactive network this is specified PDN linkup transmit upstream datas；The UE is by the former inactive network mark in the context of the PDN connections of currently transmitted upstream data It is designated as the currently active network, former activation network and is labeled as current inactive network.

PGW is received after upstream datas of the UE by PDN linkup transmits, however, it is determined that be currently received the PDN of upstream data Network is the inactive network of the PDN connections where connection, then will be currently received in the context of PDN connections of upstream data Former inactive network identity be the currently active network, former activation network be labeled as current inactive network.

The above embodiment of the present invention is described in order to clearer, below with 3GPP networks and non-3GPP networks Exemplified by, it is described in detail with reference to following specific embodiment.In following examples, in order to make core net understand UE position Confidence ceases, no matter activation network is 3GPP networks or non-3GPP networks, as long as UE can enter under the 3GPP network coverages Row TAU（Tracking area location updating）Process or RAU（Route location updates）Process.

It is the PDN connection management schematic flow sheets that the embodiment of the present invention one is provided referring to Fig. 3.This embodiment describes Attachment 3GPP networks and the UE that PDN connections are established in 3GPP networks, by PDN connections from 3GPP network switchings to credit non- 3GPP networks, then from the process of credit non-3GPP network switching time 3GPP networks, and PDN connections are being switched back into 3GPP nets During network, there is 3GPP network contexts in the context of the PDN connections, 3GPP networks are marked as inactive network, the PDN connects The radio bearer being connected in 3GPP networks has discharged.MME in Fig. 3（mobility management entity）For mobility Management entity, SGSN（Serving GPRS SUPPORT NODE）For GPRS serving GPRS support nodes, SGW（Serving Gateway）For gateway, PCRF（Policy and Charging Rules Function）For strategy and charging regulation work( Can, HSS（Home Subscriber Server）For home subscriber server, AAA（Authentication、 Authorization、Accounting）For mandate, certification and accounting server.As illustrated, the flow may include：

Step 1~7, UE from 3GPP network switchings to non-3GPP networks, wherein：

Step 1~2：The UE for being operated in 3GPP networks starts to non-3GPP network switchings.In handoff procedure, enter first Row non-3GPP network attachments, then for needing to be switched to the PDN connections of non-3GPP networks（For convenience of description, below will The PDN connections are expressed as PDN_web connections, i.e., the PDN connections set up for WEB service）, initiate to build in non-3GPP networks The process of vertical PDN_web connections.

Step 3：After the completion of PDN_web connections in non-3GPP networks are set up, PGW and UE are in PDN_web connections Non-3GPP network contexts are added in context（It is existing in the context of the PDN_web connections to have above and below 3GPP networks Text）, and 3GPP network identities in the context that PDN_web is connected are inactive network, are by non-3GPP network identities Activate network.

Step 4：The 3GPP network equipments（Such as base station）Eating dishes without rice or wine for 3GPP networks is initiated to UE according to radio resource management policy Carry release process.Such as, base station detecting UE lose it is synchronous, or detect UE it is inactive for a long time when, according to wireless Policy in resource management indicates that UE discharges the radio bearer of 3GPP networks.

Step 5：UE receives release PDN_web after the carrying release of 3GPP network wireless is indicated and is connected to the nothing in 3GPP networks Line is carried, and it is the inactive network of the PDN_web connections of the UE to judge 3GPP networks, therefore is refused to releasing wireless loading EPS carryings are locally deactivated.

Step 6：UE replys empty port load-supporting Release complete to the 3GPP network equipments, and base station, MME, SGW are sent successively EPS carries releasing request message.

Step 7：PGW is received after EPS carrying releasing requests, and it is that the non-of the PDN_web connections of the UE swashs to judge 3GPP networks Network living, therefore refusal initiates EPS carrying release processes.

The part or all of PDN connections for being switched to non-3GPP networks are switched back into 3GPP networks by step 8~11, UE, its In：

Step 8：UE determines PDN_web connections switching back into 3GPP networks.

Step 9：In the context of UE inquiry PDN_web connections, 3GPP networks are marked as inactive network, and PDN_ Web, which is connected in 3GPP networks, does not have corresponding radio bearer, then UE initiates extension Service Request（SR, service please Ask）Or TAU/RAU processes, and indicate that the EPS that PDN_web is connected in 3GPP networks carryings are swashed by the process It is living, PDN_web is connected to other networks（Here it is non-3GPP networks）In EPS carrying deactivated.

It is preferred that, the EPS carrying shapes in extension Service Request message or TAU/RAU request messages can be used in UE State information unit（EPS bears status IE）, it would be desirable to the EPS for the PDN connections set up and kept in 3GPP networks is held Load is designated as activation, and to activate the EPS carryings that corresponding PDN is connected in 3GPP networks, the PDN is connected in other networks EPS carryings be designated as un-activation, to deactivate the EPS carryings that corresponding PDN is connected in other networks.

Step 10：UE is according to the un-activation indicated in extension Service Request message or TAU/RAU request messages EPS carrying locally discharged immediately.MME is received after extension Service Request or TAU request messages（Or SGSN Receive after RAU request messages）, the EPS for locally deactivating the un-activation that is indicated in the request message but being activated in MME holds Carry.MME initiates bearing modification process to activation carrying, indicates that SGW or/and PGW can send data.

Step 11：3GPP network identities in the context that UE connects PDN_web are activation network, non-3GPP networks Labeled as inactive network；3GPP network identities in the context that PGW connects PDN_web are activation network, by non- 3GPP network identities are inactive network.

It is the PDN connection management schematic flow sheets that the embodiment of the present invention two is provided referring to Fig. 4.This embodiment describes Attachment 3GPP networks and the UE that PDN connections are established in 3GPP networks, by PDN connections from 3GPP network switchings to credit non- 3GPP networks, then from the process of credit non-3GPP network switching time 3GPP networks, and PDN connections are being switched back into 3GPP nets During network, 3GPP network contexts are not present in the context of the PDN connections.As illustrated, the flow may include：

Step 1~7, UE from 3GPP network switchings to non-3GPP networks, wherein：

Step 4：Because within a period of time, PDN_web is connected in 3GPP networks without upstream data, therefore PGW exists The release process of PDN_web connections is initiated in 3GPP networks.

Step 5：3GPP network contexts in the context of UE release PDN_web connections.

Step 6：UE replys carrying release response to PGW.

Step 7：PGW deletes the 3GPP network contexts of PDN_web connections.

The part or all of PDN connections for being switched to non-3GPP networks are switched back into 3GPP networks by step 8~10, UE, its In：

Step 8：UE determines PDN_web connections switching back into 3GPP networks.

Step 9：There is no 3GPP network contexts in the context of UE inquiry PDN_web connections, then UE is again in 3GPP nets PDN_web establishment of connection processes are initiated in network.

Step 10：3GPP network identities in the context that UE connects PDN_web are activation network, non-3GPP networks Labeled as inactive network；3GPP network identities in the context that PGW connects PDN_web are activation network, by non- 3GPP network identities are inactive network.

It is the PDN connection management schematic flow sheets that the embodiment of the present invention three is provided referring to Fig. 5.This embodiment describes Attachment 3GPP networks and the UE that PDN connections are established in 3GPP networks, by PDN connections from 3GPP network switchings to credit non- 3GPP networks, then from the process of credit non-3GPP network switching time 3GPP networks, and PDN connections are being switched back into 3GPP nets During network, there is 3GPP network contexts in the context of the PDN connections and the PDN is connected to radio bearer in 3GPP networks not Release.As illustrated, the flow may include：

Step 1~7, UE from 3GPP network switchings to non-3GPP networks, wherein：

Step 8：UE determines PDN_web connections switching back into 3GPP networks.

Step 9：There is 3GPP network contexts in the context of UE inquiry PDN_web connections, 3GPP networks are marked as Inactive network, and PDN_web is connected in 3GPP networks and there is radio bearer, therefore UE passes through the PDN_ in 3GPP networks Web linkup transmit upstream datas.

Step 10：PGW have received upstream data by the PDN_web connections of 3GPP networks, upper due to PDN_web connections Hereinafter 3GPP networks are marked as inactive network, therefore renewal 3GPP networks are set to activate network, and non-3GPP networks are Inactive network.

It is the PDN connection management schematic flow sheets that the embodiment of the present invention four is provided referring to Fig. 6.This embodiment describes Adhere to the UE of 3GPP networks and non-3GPP networks, PDN is connected（Non-3GPP networks in the PDN connection contexts are marked It is designated as inactive network）It is switched to the process of non-3GPP networks.When UE by PDN connections from non-3GPP network switching to 3GPP Network, when the PDN connections being switched back into non-3GPP networks again afterwards, it may occur that above-mentioned situation.As illustrated, the flow It may include：

Step 1：UE determines PDN connections being switched to non-3GPP networks, for the PDN connections of the desired switchings of UE, non- 3GPP networks are non-activation networks, i.e. in the context of the PDN connections, non-3GPP networks are marked as inactive network.

Step 2：UE sends upstream data in the PDN connections in non-3GPP networks.

Step 3：After the complete upstream datas of PDN linkup transmits of UE in non-3GPP networks, the PDN is connected above and below Non-3GPP network identities in text are activation network, are inactive network by 3GPP network identities.

Step 4:After the upstream data that PGW receives PDN connections from non-3GPP Network Access Points, above and below the PDN connections Non-3GPP network identities in text are activation network, are inactive network by 3GPP network identities.

It is the PDN connection management schematic flow sheets that the embodiment of the present invention five is provided referring to Fig. 7.This embodiment describes Adhere to the UE of 3GPP networks and non-3GPP networks, in the case of there was only 3GPP network contexts in PDN connection contexts, The process of PDN connections is set up in non-3GPP networks.When UE sets up PDN connections in 3GPP networks, the PDN connections are cut afterwards When changing to non-3GPP networks, it may occur that above-mentioned situation.As illustrated, the flow may include：

Step 1：UE determines to set up PDN connections in non-3GPP networks, the PDN connections wanted to set up for UE, above and below it There is no non-3GPP network contexts, or only 3GPP network contexts in text.

Step 2：UE sets up the PDN connections in non-3GPP networks.

Step 3：UE is set up in non-3GPP networks to be completed after the PDN connections, by the non-in the PDN connection contexts 3GPP network identities are activation network, are inactive network by 3GPP network identities.

Step 4:PGW is completed after the PDN connections of non-3GPP networks are set up, by non-in the PDN connection contexts 3GPP network identities are activation network, are inactive network by 3GPP network identities.

In the above embodiment of the present invention, PDN is connected to after switching between 3GPP networks and non-3GPP networks, keeps using PDN connection of the family in former network, makes terminal move back and forth between 3GPP networks and non-3GPP networks, or due to various originals In the case of because toggling PDN connections, service bearer can be quickly set up, the delay switched between network is effectively reduced.The party Case realizes simple and flexible, with stronger operability.

Based on identical technical concept, the embodiment of the present invention additionally provides a kind of PDN Gateway equipment.

It is the schematic diagram of PDN Gateway equipment provided in an embodiment of the present invention referring to Fig. 8, as illustrated, the PDN connection nets Closing equipment may include：PDN connections processing module 81, PDN connection context maintenances module 82, can also further comprise detection module 83, data transmission module 84 is further may also include, wherein：

PDN connections processing module 81, for accessing during the second network attachment of terminal initiation of first network, Needed to be switched to the PDN connections of the second network from first network according to the terminal, PDN connections are set up in the second network；Wherein, Need to be switched to the PDN connections of the second network from first network described in the PDN connections set up in the second network and first network Share PDN connection contexts；

PDN connection context maintenances module 82, for the PDN set up according to PDN connections processing module 81 in the second network Connection, adds the second network context in corresponding PDN connections context, and by the in the corresponding PDN connections context One network identity is the inactive network of the corresponding PDN connections, by activation that the second network identity is the corresponding PDN connections Network.

Wherein, the first network is 3GPP networks, and second network is non-3 GPP network；Or, first net Network is non-3 GPP network, and second network is 3GPP networks.

Further, PDN connections processing module 81 is additionally operable to：Receive connecting to specified PDN for 3GPP equipments of the core network transmission After the request that the carrying connect is modified, the carrying for specifying PDN connections is changed according to the request.Accordingly, PDN connections context Maintenance module 82 is additionally operable to：If it is determined that the network where the carrying that the PDN connections processing module is changed is to specify PDN connections Inactive network, then the inactive network identity in context Central Plains connected specified PDN is the currently active network, former activation network Network is labeled as current inactive network.

Further, PDN connections processing module 81 is additionally operable to：What receiving terminal was initiated sets up after the request of PDN connections, root PDN connections are set up according to the request being currently received.Accordingly, PDN connection context maintenances module 82 is additionally operable to：If PDN connections There is no the PDN to be connected to the context of place network in the context for the PDN connections that processing module 81 is currently set up, and currently build Network where vertical PDN connections is not the activation network of the PDN connections, then is connected to according to the PDN currently set up in PDN connections The context of network where the PDN is connected to hereinafter is added, and is by the former inactive network identity in PDN connection contexts The currently active network, former activation network are labeled as current inactive network.

Further, PDN connection context maintenances module 82 is additionally operable to：Terminal is received in the PDN Gateway equipment to lead to After the upstream data for crossing PDN linkup transmits, however, it is determined that network connects for the PDN where being currently received the PDN connections of upstream data Former inactive network identity in the inactive network connect, the then context for the PDN connections that will be currently received upstream data is The currently active network, former activation network are labeled as current inactive network.

Further, detection module 83, for for including the PDN of activation network context and inactive network context Connection, detection PDN is connected to the data transfer in its activation network or/and inactive network.PDN connections processing module 81 is also used In：Detection module 83 detect PDN be connected to setting duration in its activate network in there is no data transfer when, initiate to work as Before the PDN that detects be connected to it and activate release process in network, non-swash at its if detecting PDN and being connected in setting duration There is no data transfer in network living, then initiate the release process being connected to currently detected PDN in its inactive network.

Detection module 83 can be used for detecting the data transfer of PDN connections.Accordingly, PDN connections processing module 81 is gone back For：If detection module 83, which detects PDN and is connected in setting duration, does not have data transfer, and currently detected PDN connections Context include activate network context and inactive network context, then in currently detected PDN connections Activate in network and inactive network, the release process to currently detected PDN connections is initiated respectively.

Further, PDN connections processing module 81 is additionally operable to：Release, which is received, in 3GPP networks specifies holding for PDN connections After the request of load, if being carried in the inactive network of specified PDN connections for request release, refuses release and specifies PDN connections Carrying.

Further, data transmission module 84, for after reception needs to be sent to the downlink data of terminal, according to described The context of the PDN connections of the target terminal of downlink data, inquires about the activation network of PDN connections, and the activation by inquiring PDN in network is connected to the target terminal of the downlink data and is sent the downlink data.

Based on identical technical concept, the embodiment of the present invention additionally provides a kind of terminal device.

It is the structural representation of terminal device provided in an embodiment of the present invention referring to Fig. 9, as illustrated, the terminal device It may include：PDN connections processing module 91, PDN connection context maintenance modules, can also further comprise data transmission module 93, Wherein：

PDN connections processing module 91, the second network for being initiated in the terminal device after access first network is attached During, the PDN connections of the second network are switched to from first network as needed, PDN connections are set up in the second network；Its In, need to connect from the PDN that first network is switched to the second network described in the PDN connections set up in the second network and first network Connect shared PDN connections context；

PDN connection context maintenances module 92, for the PDN set up according to PDN connections processing module 91 in the second network Connection, adds the second network context in corresponding PDN connections context, and by the in the corresponding PDN connections context One network identity is the inactive network of the corresponding PDN connections, by activation that the second network identity is the corresponding PDN connections Network.

Further, PDN connections processing module 91 is additionally operable to, and is needing specified PDN connections being switched to from activation network There is inactive network context, but the specified PDN connections in inactive network, and the context of the specified PDN connections When not having radio bearer in current inactive network, the expansion service request or tracing section updating request of initiation or Route Area are more New request, wherein carrying the configured information for the bearing activation that the specified PDN is connected to current inactive network.Accordingly , PDN connection context maintenances module 92 is additionally operable to, by the inactive network identity in context Central Plains of the specified PDN connections Current inactive network is labeled as the currently active network, former activation network.

Further, PDN connections processing module 91 is additionally operable to, and is needing specified PDN connections being switched to from activation network When inactive network context is not present in inactive network, and the context of the specified PDN connections, initiate to specify described The inactive network of PDN connections sets up the request of the specified PDN connections.Accordingly, PDN connection context maintenances module 92 is gone back For after the inactive network of the specified PND connections sets up the specified PDN connections, being added in PDN connection contexts The context of network where the PDN is connected to, and be the currently active net by the former inactive network identity in PDN connection contexts Network, former activation network are labeled as current inactive network.

Further, PDN connections processing module 91 is additionally operable to, and is needing specified PDN connections being switched to from activation network There is inactive network context in inactive network, and the context of the specified PDN connections, and the specified PDN connects It is connected on when there is radio bearer in inactive network, by the specified PDN linkup transmits upstream data in inactive network, Wherein, the activation network of the specified PDN connections is that 3GPP networks, inactive network are non--3GPP networks；In PDN connections Hereafter maintenance module 92 is additionally operable to, by the former inactive network identity in the context of the PDN connections of currently transmitted upstream data Current inactive network is labeled as the currently active network, former activation network.

Or, PDN connections processing module 91 is additionally operable to, and is switched to specified PDN connections from activation network in needs non-sharp Network living, and when there is inactive network context in the context of the specified PDN connections, pass through the institute in inactive network Specified PDN linkup transmits upstream data is stated, wherein, the activation network of the specified PDN connections is non-3 GPP network, inactive net Network is 3GPP networks；PDN connection context maintenances module 92 is additionally operable to, above and below the PDN connections of currently transmitted upstream data Former inactive network identity in text is the currently active network, former activation network is labeled as current inactive network.

Further, PDN connections processing module 91 is additionally operable to, and release is received in 3GPP networks and specifies PDN connections After the request of radio bearer, however, it is determined that 3GPP networks mark inactive network in the context for specifying PDN connections, then refuse this The carrying of PDN connections is specified in ground release.

Further, data transmission module 93, for when needing to send upstream data, by activating the PDN in network Linkup transmit upstream data.

The present invention is with reference to method according to embodiments of the present invention, equipment（System）And the flow of computer program product Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.

These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.

These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in individual square frame or multiple square frames.

, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent Select embodiment and fall into having altered and changing for the scope of the invention.

Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims

1. a kind of grouped data network PDN connection management method, it is characterised in that methods described includes：

PDN Gateway equipment is during the second network attachment that the terminal for having accessed first network is initiated, according to the terminal need The PDN connections of the second network are switched to from first network, PDN connections are set up in the second network；Wherein, set up in the second network PDN connections and first network described in need to be switched to above and below the shared PDN connections of the PDN of the second network connections from first network Text；

The PDN Gateway equipment adds second according to the PDN connections set up in the second network in corresponding PDN connections context Network context, and first network is labeled as the inactive of the corresponding PDN connections in the corresponding PDN connections context Network, by the second network identity be the corresponding PDN connections activation network.

2. the method as described in claim 1, it is characterised in that methods described also includes：

The PDN Gateway equipment receives the request modified to the carrying of specified PDN connections that 3GPP equipments of the core network are sent, The carrying for specifying PDN connections is changed according to the request；

The PDN Gateway equipment will be if it is determined that the network where the carrying changed then will to specify the inactive network of PDN connections The inactive network identity in context Central Plains for specifying PDN connections is the currently active network, former activation network labeled as current non-sharp Network living.

3. the method as described in claim 1, it is characterised in that methods described also includes：

The request for setting up PDN connections that the PDN Gateway equipment receiving terminal is initiated, sets up according to the request being currently received PDN connections；

If there is no the PDN to be connected to the context of place network in the context for the PDN connections currently set up, and currently set up Network where PDN connections is not the activation network of the PDN connections, then is connected to PDN connection contexts according to the PDN currently set up The context of network where middle addition PDN is connected to, and be current by the former inactive network identity in PDN connection contexts Activate network, former activation network and be labeled as current inactive network.

4. the method as described in claim 1, it is characterised in that methods described also includes：

The PDN Gateway equipment is received after upstream data of the terminal by PDN linkup transmits, however, it is determined that be currently received up Network is the inactive network of the PDN connections where the PDN connections of data, then will be currently received the PDN connections of upstream data Context in former inactive network identity be the currently active network, former activation network be labeled as current inactive network.

5. the method as described in one of claim 1-4, it is characterised in that methods described also includes：

The PDN Gateway equipment detects PDN for including the PDN connections of activation network context and inactive network context The data transfer in its activation network or/and inactive network is connected to, is swashed if detecting PDN and being connected in setting duration at it There is no data transfer in network living, then the release process being connected to currently detected PDN in its activation network is initiated, if inspection Measuring PDN and being connected in setting duration does not have data transfer in its inactive network, then initiates to currently detected PDN companies It is connected on the release process in its inactive network；Or

The PDN Gateway equipment detects the data transfer of PDN connections, if detecting PDN and being connected in setting duration does not have data Transmission, and the context of currently detected PDN connections includes the context of activation network and the context of inactive network, Then in the activation network and inactive network of currently detected PDN connections, initiate respectively to currently detected PDN connections Release process.

6. the method as described in one of claim 1-4, it is characterised in that methods described also includes：

The PDN Gateway equipment is received in 3GPP networks after the request of carrying that PDN connections are specified in release, if request release Be carried in the inactive network of specified PDN connections, then the carrying of PDN connections is specified in refusal release.

7. the method as described in one of claim 1-4, it is characterised in that methods described also includes：

The PDN Gateway equipment, which is received, to be needed to be sent to after the downlink data of terminal, according to the target terminal of the downlink data PDN connections context, inquire about the activation network of PDN connections, and connect to institute by the PDN in the activation network that inquires The target terminal for stating downlink data sends the downlink data.

8. the method as described in claim 1, it is characterised in that the first network is 3GPP networks, second network is Non-3 GPP network；Or, the first network is non-3 GPP network, and second network is 3GPP networks.

9. a kind of grouped data network PDN connection management method, it is characterised in that methods described includes：

During the second network attachment that terminal is initiated after access first network, second is switched to from first network as needed The PDN connections of network, PDN connections are set up in the second network；Wherein, in the PDN connections and first network that the second network is set up It is described to need to share PDN connection contexts from the PDN connections that first network is switched to the second network；

The terminal adds above and below the second network according to the PDN connections set up in the second network in corresponding PDN connections context Text, and in the corresponding PDN connections context by first network labeled as the corresponding PDN connections inactive network, general Second network identity is the activation network of the corresponding PDN connections.

10. method as claimed in claim 9, it is characterised in that methods described also includes：

The terminal is needing specified PDN connections being switched to 3GPP networks from non-3 GPP network, and the specified PDN connections 3GPP networks in 3GPP network contexts are marked as inactive network, but the specified PDN is connected in 3GPP networks and do not had When having radio bearer, the request of the expansion service of initiation or tracing section updating request or Routing Area Update request, wherein carry by The specified PDN is connected to the configured information of the bearing activation of current inactive network；

The inactive network identity in context Central Plains of the specified PDN connections is the currently active network, former activation by the terminal Network identity is current inactive network.

11. method as claimed in claim 9, it is characterised in that methods described also includes：

The terminal is needing specified PDN connections being switched to inactive network from network is activated, and the specified PDN connections When inactive network context is not present in context, initiate to set up the finger in the inactive network of the specified PDN connections Determine the request of PDN connections；

The terminal is after the inactive network of the specified PND connections sets up the specified PDN connections, above and below PDN connections The context of network where the PDN is connected to is added in text, and is to work as by the former inactive network identity in PDN connection contexts Preceding activation network, former activation network are labeled as current inactive network.

12. method as claimed in claim 9, it is characterised in that methods described also includes：

The terminal is needing specified PDN connections being switched to inactive network from network is activated, and the specified PDN connections There is inactive network context in context, and the specified PDN is connected to when there is radio bearer in inactive network, By the specified PDN linkup transmits upstream data in inactive network, wherein, the activation network of the specified PDN connections It is non--3GPP networks for 3GPP networks, inactive network；The terminal is upper by the PDN connections of currently transmitted upstream data Former inactive network identity hereinafter is the currently active network, former activation network labeled as current inactive network；

Or, the terminal is needing specified PDN connections being switched to inactive network, and the specified PDN from activation network When there is inactive network context in the context of connection, by the specified PDN linkup transmits in inactive network Row data, wherein, the activation networks of the specified PDN connections is that non-3 GPP network, inactive network are 3GPP networks；The end Former inactive network identity in the context of the PDN connections of currently transmitted upstream data is the currently active network by end, original swashs Network identity living is current inactive network.

13. the method as described in one of claim 9-12, it is characterised in that methods described also includes：

The terminal is received in 3GPP networks after the request of radio bearer that PDN connections are specified in release, however, it is determined that 3GPP nets Network mark in the context for specifying PDN connections is network, then refuses the carrying that PDN connections are specified in local release.

14. the method as described in one of claim 9-12, it is characterised in that methods described also includes：

When the terminal needs to send upstream data, by activating the PDN linkup transmit upstream datas in network.

15. method as claimed in claim 9, it is characterised in that the first network is 3GPP networks, second network is Non-3 GPP network；Or, the first network is non-3 GPP network, and second network is 3GPP networks.

16. a kind of Packet Data Network's PDN Gateway equipment, it is characterised in that including：

PDN connection processing modules, for accessing during the second network attachment of terminal initiation of first network, according to institute Stating terminal is needed to be switched to the PDN connections of the second network from first network, and PDN connections are set up in the second network；Wherein, second The PDN connections that network is set up and the shared PDN of PDN connections for needing to be switched to the second network from first network described in first network Connect context；

PDN connection context maintenance modules, for the PDN connections set up according to the PDN connection processing modules in the second network, The second network context is added in corresponding PDN connections context, and by first network in the corresponding PDN connections context Inactive network labeled as the corresponding PDN connections, by activation network that the second network identity is the corresponding PDN connections.

17. PDN Gateway equipment as claimed in claim 16, it is characterised in that the PDN connections processing module is additionally operable to, and is connect Receive after the request modified to the carrying of specified PDN connections that 3GPP equipments of the core network are sent, changed and specified according to the request The carrying of PDN connections；

The PDN connections context maintenance module is additionally operable to, however, it is determined that where the carrying that the PDN connections processing module is changed Network be the inactive network for specifying PDN connections, then the inactive network identity in context Central Plains connected specified PDN is ought Preceding activation network, former activation network are labeled as current inactive network.

18. PDN Gateway equipment as claimed in claim 16, it is characterised in that the PDN connections processing module is additionally operable to, and is connect What receipts terminal was initiated is set up after the request of PDN connections, and PDN connections are set up according to the request being currently received；

The PDN connections context maintenance module is additionally operable to, if the PDN connections that PDN connections processing module is currently set up There is no the PDN to be connected to the context of place network in context, and network where the PDN connections currently set up is not the PDN The activation network of connection, then be connected in PDN connection contexts according to the PDN currently set up and add net where the PDN is connected to The context of network, and be the currently active network, former activation network identity by the former inactive network identity in PDN connection contexts For current inactive network.

19. PDN Gateway equipment as claimed in claim 16, it is characterised in that the PDN connections context maintenance module is also used In after the PDN Gateway equipment receives upstream data of the terminal by PDN linkup transmits, however, it is determined that be currently received Network where the PDN connections of row data is the inactive network of the PDN connections, then connects the PDN for being currently received upstream data Former inactive network identity in the context connect is the currently active network, former activation network is labeled as current inactive network.

20. the PDN Gateway equipment as described in one of claim 16-19, it is characterised in that also including detection module, for pair In include activation network context and inactive network context PDN connections, detection PDN be connected to its activation network or/and Data transfer in inactive network；

The PDN connections processing module is additionally operable to, if the detection module detects PDN and is connected in setting duration in its activation There is no data transfer in network, then the release process being connected to currently detected PDN in its activation network is initiated, if detection Be connected to PDN in setting duration does not have data transfer in its inactive network, then initiates to currently detected PDN connections Release process in its inactive network；

Or, the PDN Gateway equipment also includes detection module, the data transfer for detecting PDN connections；

The PDN connections processing module is additionally operable to, if the detection module, which detects PDN and is connected in setting duration, does not have data Transmission, and the context of currently detected PDN connections includes the context of activation network and the context of inactive network, Then in the activation network and inactive network of currently detected PDN connections, initiate respectively to currently detected PDN connections Release process.

21. the PDN Gateway equipment as described in one of claim 16-19, it is characterised in that the PDN connections processing module is also For after the request for the carrying that the specified PDN connections of release are received in 3GPP networks, if asking what is discharged to be carried on specified PDN In the inactive network of connection, then the carrying of PDN connections is specified in refusal release.

22. the PDN Gateway equipment as described in one of claim 16-19, it is characterised in that also include：

Data transmission module, for after reception needs to be sent to the downlink data of terminal, according to the target of the downlink data The context of the PDN connections of terminal, inquires about the activation network of PDN connections, and the PDN connections activated in network by inquiring The downlink data is sent to the target terminal of the downlink data.

23. PDN Gateway equipment as claimed in claim 16, it is characterised in that the first network is 3GPP networks, described the Two networks are non-3 GPP network；Or, the first network is non-3 GPP network, and second network is 3GPP networks.

24. a kind of terminal device, it is characterised in that including：

PDN connection processing modules, for the second network attachment process initiated in the terminal device after access first network In, the PDN connections of the second network are switched to from first network as needed, PDN connections are set up in the second network；Wherein, Need to share from the PDN connections that first network is switched to the second network described in the PDN connections of two networks foundation and first network PDN connection contexts；

25. terminal device as claimed in claim 24, it is characterised in that the PDN connections processing module is additionally operable to, is needing Specified PDN connections are switched in 3GPP networks, and the context of the specified PDN connections on 3GPP networks from non-3 GPP network 3GPP networks hereinafter are marked as inactive network, but the specified PDN is connected in 3GPP networks does not have radio bearer When, the expansion service request or tracing section updating request or Routing Area Update request of initiation, wherein carrying the specified PDN It is connected to the configured information of the bearing activation of current inactive network；

The PDN connections context maintenance module is additionally operable to, by the inactive network mark in context Central Plains of the specified PDN connections It is designated as the currently active network, former activation network and is labeled as current inactive network.

26. terminal device as claimed in claim 24, it is characterised in that the PDN connections processing module is additionally operable to, is needing Specified PDN connections are switched in inactive network, and the context of the specified PDN connections from activation network and swashed in the absence of non- During network context living, the inactive network initiated in the specified PDN connections sets up the request of the specified PDN connections；

The PDN connections context maintenance module is additionally operable to, and described specify is set up in the inactive network of the specified PND connections After PDN connections, the context of network where the PDN is connected to is added in PDN connection contexts, and PDN is connected into context In former inactive network identity be the currently active network, former activation network be labeled as current inactive network.

27. terminal device as claimed in claim 24, it is characterised in that the PDN connections processing module is additionally operable to, is needing By specified PDN connections from activation network be switched in inactive network, and the context of the specified PDN connections exist it is inactive Network context, and the specified PDN are connected to when there is radio bearer in inactive network, by inactive network The specified PDN linkup transmits upstream data, wherein, the activation network of the specified PDN connections is 3GPP networks, inactive net Network is non--3GPP networks；The PDN connections context maintenance module is additionally operable to, by the PDN connections of currently transmitted upstream data Context in former inactive network identity be the currently active network, former activation network be labeled as current inactive network；

Or, the PDN connections processing module is additionally operable to, and is switched to specified PDN connections from activation network in needs inactive When there is inactive network context in network, and the context of the specified PDN connections, described in inactive network PDN linkup transmit upstream datas are specified, wherein, the activation network of the specified PDN connections is non-3 GPP network, inactive network For 3GPP networks；The PDN connections context maintenance module is additionally operable to, above and below the PDN connections of currently transmitted upstream data Former inactive network identity in text is the currently active network, former activation network is labeled as current inactive network.

28. the terminal device as described in one of claim 24-27, it is characterised in that the PDN connections processing module is also used In after the request for the radio bearer that the specified PDN connections of release are received in 3GPP networks, however, it is determined that 3GPP networks are being specified Mark is network in the context of PDN connections, then refuses the carrying that PDN connections are specified in local release.

29. the terminal device as described in one of claim 24-27, it is characterised in that also including data transmission module, for When needing to send upstream data, by activating the PDN linkup transmit upstream datas in network.

30. terminal device as claimed in claim 24, it is characterised in that the first network is 3GPP networks, described second Network is non-3 GPP network；Or, the first network is non-3 GPP network, and second network is 3GPP networks.