CN101483932B - Method for releasing packet data network connection - Google Patents
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Abstract
The invention provides a method for releasing grouping data network connection which includes steps as follows: an user equipment UE sends a request for releasing a grouping data network PDN bearing resource to a network service entity, the request information contains all indicating information of the UE connected with the PDN network; the network service entity analyses the received request information; the network service entity triggers the PDN gateway for executing bearing releasing process. The UE can initiate a process for releasing all connections with the PDN network, accordingly, releasing all bearing resource used for connecting the PDN network and IP address distributed to the UE when the UE needs not process data communication with one PDN network, the UE is allowed to utilize PDN GW selection method for selecting perfect PDN GW when the UE establishes connection with the PDN next time.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to the method that a kind of release packet data network by user equipment requests (PDN, Packet Data Network) connects.
Background technology
In present system evolved framework (SAE, System Architecture Evolution) system, allow user device in network (UE, User Equipment) to initiate a plurality of PDN connection requests.
UE is in initially adhering to (Attach) process, can pass through to mobile management entity (MME, Mobility Management Entity) initiates a default PDN connection request message, MME according to the UE that from local subscribed services device (HSS), obtains signatory in order to be linked into the default access point name (APN of PDN network, Access Point Name) etc. parameter is selected the PDN network that connected, realizes the connection of UE to a PDN network.After this, when UE wishes to visit other PDN networks, UE also can initiate to set up many PDN network connection requests process, and the PDN network that provides information such as APN will visit with indication to MME, this many PDN network establishment of connection, can be by selected PDN Gateway (PDN GW in the initial attaching process, PDN GateWay) finishes, also can select other PDN GW to finish, the selection of PDN GW is decided according to the selection strategy of the PDN GW described in the 3GPP TS23.401 by the MME of this UE of service.
We can illustrate being connected of UE and PDN network by Fig. 1, each bar line represents that a PDN network connects the carrying of using among the figure, wherein, solid line is represented the default bearer of PDN network, dotted line is represented the designated bearing (Dedicated Bearer) that UE and PDN network are set up, heavy line represents to pass through in the initial Attach process default bearer that default APN sets up, fine line is represented the default bearer set up with other PDN network after the initial Attach process, and middle some functional node such as base station (eNodeB) and gateway (Serving GW) etc. omit in this figure.As shown in Figure 1, UE can set up connection with different PDN networks by a plurality of PDN GW, and in being connected of each PDN network the default bearer (default bearer) of a UE to PDN GW is arranged all.In addition, under strategy and charging control architecture (PCC, Policy and Charging Control), between UE and PDN GW, can also set up a plurality of designated bearings.
In existing SAE system, UE can ask PDN GW to discharge this UE and the internetwork some designated bearing resources of appointment PDN by initiating the releasing bearing process, but can not discharge the default bearer that is connected with this PDN network, UE is connected with the PDN network that the default bearer of being set up only separates from system at UE just can be deleted under the situation that (Detach) or subscription data change, otherwise UE will keep and being connected of this PDN network always, so that when needs transmission data, can rebulid connection, make things convenient for downlink data to send to UE fast by network by signaling.Therefore, if the Detach of UE does not take place or not the changing of subscription data, even UE has deleted all the designated bearing resources with this PDN network, because the maintenance of default bearer, after this UE is still by initial being connected of employed PDN GW maintenance and this PDN network when connecting with this PDN network.
Therefore, because UE can't initiatively initiate to discharge all bearing resources that comprise default bearer and designated bearing, cause UE as long as do not shut down, no matter still local at roaming condition, to have to visit this PDN network by some PDN GW always, will there be influence in this to the processing of user's data business, and this influence mainly shows as:
When the UE occurrence positions changed, PDN GW can not make corresponding change, may cause the appearance of circuitous data route.For example,, when arriving other PDN GW overlay areas again, also to use the PDN GW of contract signing place to connect, thereby make and to optimize the data route if UE is after the PDN GW of contract signing place by contract signing place connects certain PDN network.Even more serious situation is, if UE is striding under the regional roaming condition that charges, utilize the place charge the PDN GW in zone set up with being connected of certain PDN after, return signatory charging and can't select the local faster PDN GW of speed to visit this PDN when regional.This has not only reduced user experience, also can increase offered load, is unfavorable for the processing of load-balancing mechanism.
When distributing the IP address of UE by PDN GW or the Radius that is connected with PDN GW or Diameter server, may too much cause the address assignment anxiety of this PDN GW owing to the connection of roaming UE on certain PDN GW, thereby influence is to the processing of the access service of local UE.
Be the problems referred to above that exist in the example explanation prior art scheme with UE in the situation of striding the zone roaming of chargeing below.As shown in Figure 2, if Beijing UE1 and Shanghai UE2 switch to local MME3 to Xishuangbanna the time, and all asked with its signatory PDN network in the locality be being connected of PDN1, this MME that connects by Xishuangbanna has selected the PDN GW3 of locality, Xishuangbanna to set up, and UE1 and UE2 get back to Beijing and Shanghai respectively afterwards.UE1 and UE2 do not have shutdown normally to continue to pay dues yet in this process, and may can not go to Xishuangbanna again in for a long time from now on, but after this when PDN network PDN1 that these two user equipment access connect during in Xishuangbanna, owing to do not discharge the connection of PDN1, the PDN GW3 that will have to continue by locality, Xishuangbanna conducts interviews, and employed IP address also is the IP address of locality, Xishuangbanna.This will cause user data to detour and may take the address pool of PDN GW3 at the PDN in Xishuangbanna GW3, extreme case down even can cause local UE3 to require to set up network connecting the time PDN GW3 service can't be provided.
This shows that prior art can not provide a kind of release PDN method of network connection by the UE request, be unfavorable for that UE selects optimum PDN GW to be its service later on.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of release PDN method of network connection by user equipment requests, and this method can make the application data access needs of subscriber equipment according to itself, and request release is connected with all of certain PDN network.
In order to achieve the above object, the technical scheme that the present invention proposes is: a kind of method that discharges the packet data network connection may further comprise the steps:
The request message that a transfers the family equipment UE to send to discharge a packet data network PDN bearing resource is to network service entity, comprises in the described request message to be used to indicate all indication informations that are connected that discharge described UE and described PDN network;
B) network service entity is resolved the UE request message of receiving, according to the described indication information that is comprised in the request message, determines that the UE request discharges all connections of PDN network therewith;
C) network service entity triggers PDN Gateway PDN GW and carries out the carrying dispose procedure, to discharge all connections of PDN network therewith.
In the aforesaid method, also comprise step between described step b) and the step c): described network service entity judges whether to accept described UE request according to the subscription data of the position of the UE of its preservation, UE and the network service strategy information of Virtual network operator, if receive then continue execution in step c).
In the aforesaid method, described step c) comprises:
Described network service entity sends all connection requests that discharge described UE and described PDN network to gateway Serving GW;
After Serving GW receives the request of network service entity transmission, send described request to PDN GW;
After PDN GW receives described request, carry out the carrying dispose procedure.
In the aforesaid method, when described network service entity was not accepted described UE request, described method further comprised step: send the refusal request message to UE, notice UE request is rejected.
In the aforesaid method, described network service entity is after UE sends the refusal request message, also comprise step, when containing in the refusal request message that UE receives when not allowing UE to initiate once more to discharge the information of connection, UE will preserve described refusal information, when the release connection request of initiating once more described PDN network, the described refusal information of inquiry earlier, and abandon initiating this according to described refusal information and discharge connection request.
In the aforesaid method, the described indication information in the described step a) is:
The indication information that contains APN, wherein, described APN is used to indicate UE to require to discharge the described PDN network that connects;
The indication information that contains the information of implicit APN, wherein, the information of described implicit APN is used to indicate UE to require to discharge the described PDN network that connects, the information of described implicit APN is the bearing identification LBI of carrying release indication parameter Teardown Indication and link, employed APN when utilize LBI and the combination of Teardown Indication to indicate described UE to be connected with described PDN network this moment; Or
Contain LBI but do not contain the indication information of data stream filtering container TFT parameter, wherein, described LBI is used to indicate described PDN network.
In the aforesaid method, described network service entity is mobile management entity MME or service support node SGSN.
By adopting technique scheme, the present invention allows UE initiatively initiatively to send all connection request message that discharge with certain PDN network to network service entity, and can finally trigger PDN Gateway by network service entity and carry out the carrying dispose procedure, thereby release is connected with all of this PDN network foundation, is convenient to UE and can selects for use more excellent PDN GW to be its service when next and this PDN network connect again.
Description of drawings
Fig. 1: in the existing SAE system, the connection diagram of UE and a plurality of PDN networks.
Fig. 2: in the existing SAE system, UE stride charge the zone by local PDN GW set up with
After the connection of PDN network, return the connection procedure schematic diagram of signatory this PDN network of message area domain browsing again.
Fig. 3: main process schematic diagram of the present invention.
Fig. 4: the process schematic diagram of a preferred embodiment of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 3, key step of the present invention comprises:
301 UE send the request message of release one PDN bearing resource to network service entity, comprise in the described request message to be used to indicate this UE of release indication information of all connections of PDN network therewith;
302 network service entities are resolved the UE request message of receiving, according to the described indication information that is comprised in the request message, determine that the UE request discharges all connections of PDN network therewith;
303 network service entities trigger PDN Gateway and carry out the carrying dispose procedure.
Wherein, network service entity is different and different along with employed network system, can be MME or service support node (SGSN, Serving GPRS Supporting Node).
Below we the present invention is described further by a preferred embodiment.For handling for simplicity, this embodiment can realize that the network service entity among this embodiment is MME based on the release designated bearing request process that UE in the prior art initiates, and it mainly may further comprise the steps as shown in Figure 4:
401.UE the request message that sends a certain PDN network carrying resource of release through the base station carry out step 402 then to MME.
Can carry data stream filtering container (TFT in the release PDN network carrying request message that UE sent in the step 401, Traffic Flow Template), process Transaction Identifier (PTI, ProcedureTransaction Identity), APN is or/and the information of implicit APN, wherein, it is corresponding with the carrying dispose procedure that PDN GW initiates that the carrying that the PTI parameter is used for that UE is initiated discharges request, so that UE determines that the carrying dispose procedure of PDN GW initiation is by its initiation, the information of APN and implicit APN can be used to indicate UE to require to discharge the PDN network that is connected, the information of implicit APN can discharge the bearing identification (LBI of indication parameter (Teardown Indication) and link for carrying, LinkedEPS Bearer Identity), the sign of the default bearer of this PDN of LBI parametric representation, employed APN when LBI can indicate this UE to be connected with indicated PDN network with the combination of Teardown Indication.
For the request this time of indicating is that all that discharge this UE and indicated PDN network are connected, promptly the bearing resource that is discharged comprises default bearer and designated bearing, rather than some designated bearings, can realize that by the mode that in request message, comprises (or not comprising) some information the form of expression that this indication information can be taked in force is exemplified below:
1) contain the indication information of APN, wherein, described APN is used to indicate UE to require to discharge the described PDN network that connects;
2) contain the indication information of the information of implicit APN, wherein, the information of described implicit APN is used to indicate UE to require to discharge the described PDN network that connects, the information of described implicit APN is the bearing identification LBI of carrying release indication parameter Teardown Indication and link, employed APN when utilize LBI and the combination of Teardown Indication to indicate this UE to be connected with described PDN network this moment;
3) contain LBI but do not contain the indication information of data stream filtering container TFT parameter, wherein, described LBI is used to indicate described PDN network.
402.MME the UE request message of receiving is analyzed,, is learned that this request requires this UE of release to be connected with all of indicated PDN network according to the indication information that contains in the request message; Then, MME judges whether to accept this request according to the position of its UE that stores, the subscription data of UE and the information such as network service strategy of Virtual network operator.If accept, then carry out step 403.If do not accept, then carry out step 306.
403.MME send this UE of release bearing resource request of all connections of PDN therewith to Serving GW, carry out step 304 then.
404.Serving GW sends this request to PDN GW after receiving and discharging the UE bearing resource request that all connections of PDN are used therewith, carry out step 405 then.
405.PDN after GW receives request, carry out the carrying dispose procedure, all bearing resources and this UE of the connection of PDN network visit the employed IP of this PDN network address therewith to discharge this UE.
406.MME send the refusal request message through the base station to UE, notice UE request is rejected.
In the step 406, whether this connects and to allow to be discharged by UE and allow then parameter that when UE can initiate to discharge if MME comprises indication in the refuse information that UE sends, during concrete enforcement, this indication can only be finished by a cause parameter, also can discharge the PDN indication parameter by a cause parameter and a UE finishes jointly, at this moment, cause parameter is used to notify the UE failure cause, and UERelease PDN indication is used to indicate whether to allow UE to initiate to discharge, if and when allowing, UE can initiate opportunity of discharging once more.In addition, when containing in the refusal request message that UE receives when not allowing information that UE initiate to discharge connects, UE will preserve this refusal information, after this will according to this information no longer initiatively initiation to the release connection request of the PDN network that this APN connected.
Because the subscription data of UE and the network service strategy of Virtual network operator is different, UE asks unaccepted situation also to have variation thereupon, may unaccepted situation be exemplified below:
In the subscription data of UE the indicated APN correspondence of UE the PDN GW of a static state, promptly UE must visit the indicated PDN network of this APN by this PDN GW, should indicate UE not allow initiate discharge connection request in the MME refuse information this moment again;
Without any restriction, selected the PDN network not change the UE position afterwards in the subscription data of UE, indicated this moment permission UE to initiate again to discharge in the MME refuse information and ask but MME is UE.
According to said method, UE can initiatively initiate to discharge all processes that are connected of UE and a PDN network, and trigger UE initiate opportunity of this process can be for multiple, for example: use when being closed when UE monitors data relevant with a PDN network, whether all close judging that all data relevant with this PDN network are used, if all close, UE then can initiate to discharge the request of this PDN network carrying resource.
By adopting said method, UE can be when it need to carry out data communication with certain PDN network, initiatively initiate to discharge all processes that are connected of UE and this PDN network, thereby all bearing resources that release UE is connected with this PDN network and the IP address of distributing to this UE, this will make the UE that roams when next time, connection was set up, can utilize PDN GW selection mode to select more excellent PDNGW again for use, to realize the optimization of network route, avoid because the user experience that alternate route causes reduces and network bandwidth processing pressure, help the load balancing management of PDN GW, also be convenient to simultaneously the management that PDN GW optimizes Internet resources, avoid address pool resource nervous of PDN GW and the adverse effect that other subscriber equipment access services are handled thereof.For example, by adopting technique scheme, after the UE1 among Fig. 2 and UE2 get back to Beijing and Shanghai respectively, can initiatively initiate to discharge by PDN GW3 that set up and PDN1 all be connected, thereby make UE1 and UE2 respectively when its ownership place visit PDN1, can select the PDN GW1 and the PDN GW2 on its respective home ground to be its service, avoid using the situation that detours and may take the address pool of PDN GW3 of PDN GW3.
In addition, be connected professional with other special PDN networks for the business of using signatory static PDN GW, can determine whether accepting this PDN network according to UE subscription data and UE position by MME and be connected the request of release, make things convenient for some to need online always application, thereby increased the flexibility of network processes.
The present invention is equally applicable to insert by GSM EDGE Radio Access Network or UMTS Terrestrial radio access network (GERAN/UTRAN), use the situation of the core network system of Release 8, at this moment, network service entity is the service support node, promptly substitutes MME by SGSN and gets final product.In addition, because the network service strategy of existing network operator is limit, the method is not suitable for the PDN network of receiving in the initial attaching process that APN connected, i.e. the pairing PDN network of default APN in the UE subscription data.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. one kind discharges the method that packet data network connects, and it is characterized in that, may further comprise the steps:
A) user equipment (UE) send to discharge a packet data network PDN bearing resource request message to network service entity, comprise in the described request message and be used to indicate all indication informations that are connected that discharge described UE and described PDN network;
B) network service entity is resolved the UE request message of receiving, according to the described indication information that is comprised in the request message, determines that UE request release is connected with all of described PDN network;
C) described network service entity judges whether to accept described UE request according to the position of the UE of its preservation, the subscription data of UE and the network service strategy information of Virtual network operator, if accept, then network service entity triggers PDN Gateway PDN GW and carries out the carrying dispose procedure, is connected with release all with described PDN network.
2. method according to claim 1 is characterized in that, network service entity described in the described step c) triggers PDN GW execution carrying dispose procedure and comprises:
Described network service entity sends all connection requests that discharge described UE and described PDN network to gateway Serving GW;
After Serving GW receives the request of network service entity transmission, send described request to PDN GW;
After PDN GW receives described request, carry out the carrying dispose procedure.
3. method according to claim 1 is characterized in that, when described network service entity was not accepted described UE request, described method further comprised step: send the refusal request message to UE, notice UE request is rejected.
4. method according to claim 3, it is characterized in that, described network service entity is after UE sends the refusal request message, also comprise step, when containing in the refusal request message that UE receives when not allowing UE to initiate once more to discharge the information of connection, UE will preserve described refusal information, when the release connection request of initiating once more described PDN network, inquire about described refusal information earlier, and abandon initiating this release connection request according to described refusal information.
5. method according to claim 1 is characterized in that, the described indication information in the described step a) is:
The indication information that contains APN, wherein, described APN is used to indicate UE to require to discharge the described PDN network that connects;
The indication information that contains the information of implicit APN, wherein, the information of described implicit APN is used to indicate UE to require to discharge the described PDN network that connects, the information of described implicit APN is the bearing identification LBI of carrying release indication parameter Teardown Indication and link, employed APN when utilize LBI and the combination of Teardown Indication to indicate described UE to be connected with described PDN network this moment; Or
Contain LBI but do not contain the indication information of data stream filtering container TFT parameter, wherein, described LBI is used to indicate described PDN network.
6. according to the described arbitrary method of claim 1 to 5, it is characterized in that described network service entity is mobile management entity MME or service support node SGSN.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101998370B (en) * | 2009-08-21 | 2014-01-01 | 中兴通讯股份有限公司南京分公司 | System and method for releasing local IP access connection |
| CN102026409B (en) * | 2009-09-22 | 2015-05-13 | 中兴通讯股份有限公司 | System and method for releasing local internet protocol (IP) access connection |
| CN102457871B (en) * | 2010-10-26 | 2014-06-11 | 电信科学技术研究院 | Method and system for saving network resource |
| CN102625475B (en) * | 2012-04-06 | 2015-11-25 | 电信科学技术研究院 | The delet method that a kind of PDN connects and equipment |
| CN103687071A (en) * | 2012-09-24 | 2014-03-26 | 华为终端有限公司 | Connection releasing method and device for packet data network |
| CN103716771B (en) * | 2012-09-28 | 2016-12-21 | 电信科学技术研究院 | The information maintenance method of non-seamless WLAN shunt connection, Apparatus and system |
| JP6446546B2 (en) * | 2014-10-31 | 2018-12-26 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Data processing method, apparatus, terminal, mobility management entity, and system |
| EP3370475B1 (en) * | 2015-12-28 | 2020-04-22 | Huawei Technologies Co., Ltd. | Method and user equipment for releasing pdn connection |
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