CN102281519B

CN102281519B - A kind of bearing modification method and system

Info

Publication number: CN102281519B
Application number: CN201010206668.3A
Authority: CN
Inventors: 梁爽; 卢飞; 朱春晖
Original assignee: ZTE Corp
Current assignee: Global Innovation Polymerization LLC
Priority date: 2010-06-12
Filing date: 2010-06-12
Publication date: 2016-06-15
Anticipated expiration: 2030-06-12
Also published as: CN102281519A

Abstract

The invention discloses a kind of bearing modification method and system, the amendment that gateway receives from mobile management entity carries order, judge UE state in the first Access Network and the second Access Network, if UE is in Idle state in two Access Networks, carry out bearing modification according to existing method; When being in Idle state in UE wherein an Access Network, being in connected state, UE is in the Access Network of connected state in another Access Network, the QoS parameter that mobile management entity issues according to packet data gateway carries out bearing modification; UE is in the Access Network of Idle state, gateway notice mobile management entity bearing modification failure. The present invention passes through the SGW differentiation to UE current state, and then adopts different bearing modification modes, decreases unnecessary signaling transmission, thus reducing core network signalling.

Description

Method and system for modifying bearing

Technical Field

The present invention relates to an Evolved Packet System (EPS) technology, and in particular, to a bearer modification method and system.

Background

In order to maintain the competitiveness of the third generation mobile communication system in the communication field, the third generation partnership project (3 GPP) standard working group is working on the research of the evolved packet domain system (EPS).

Fig. 1 is a schematic diagram of a conventional EPS, and as shown in fig. 1, the EPS mainly includes an evolved universal terrestrial radio access network (E-UTRAN) and an evolved packet core network (EPC). The EPC can support a user to access from a Gsm Edge Radio Access Network (GERAN) and a Universal Terrestrial Radio Access Network (UTRAN).

In the EPC, a home subscriber data server (HSS), a mobility management unit (MME), a serving gateway (S-GW), a packet data network gateway (P-GW), a Serving GPRS Support Node (SGSN), and a Policy and Charging Rules Function (PCRF), wherein,

HSS is permanent storage place of user subscription data, located at home network of user subscription;

the MME is a storage place of the user subscription data in the current network and is used for taking charge of Non-access stratum (NAS) signaling management from the terminal to the network, tracking and paging management functions and bearer management in an idle mode of the user;

the S-GW is a gateway from a core network to a wireless system and is used for being responsible for user plane bearing from a terminal to the core network, data caching in an idle mode of the terminal, a function of initiating a service request by a network side, and functions of legal interception and packet data routing and forwarding;

the P-GW is a gateway of the EPS and EPS external networks and is used for taking charge of functions of IP address allocation, charging function, packet filtering, policy application and the like of the terminal;

the SGSN is a service support point for accessing GERAN and UTRAN users to the EPC network, has the similar function as the MME and is used for taking charge of the functions of position updating, paging management, bearing management and the like of the users;

and the PCRF is used for providing policy control and charging rules for the PCEF.

In the EPS, in order to reduce air interface signaling between the UE and the core network, an idle mode signaling reduction (ISR) function is introduced. After the ISR function is activated, the UE with both UTRAN/GERAN and E-UTRAN access functions can register to MME and SGSN at the same time. In this way, when the UE moves under two different access networks, the UE does not initiate a Routing Area Update (RAU) or a Tracking Area Update (TAU) between radio access technologies (inter rat). By using the ISR function, unnecessary signaling between the UE and the core network is reduced.

Fig. 2 is a schematic flowchart of a conventional UE activating an ISR function, and as shown in fig. 2, it is assumed that the UE starts to access the network through the E-TURAN (if the UTRAN/GERAN access network is similar, details are not described here), which specifically includes the following steps:

step 201: the UE registers to the MME through the E-UTRAN, and if the UE has a valid globally unique temporary UE identifier (GUTI) or a Packet-temporary Mobile subscriber identity (P-TMSI), the P-TSMI or the GUTI is carried in the attach request.

Step 202: the MME re-initiates a location update request message to the HSS after passing the check of the UE, reports the self address information to the HSS and completes the registration in the HSS.

Step 203: and the HSS returns a position updating response message to the MME, wherein the position updating response message carries subscription information of the UE.

Step 204: the MME initiates a create session request message for establishing a default bearer to the PGW through the SGW.

Step 205: and after the PGW successfully establishes the default bearer, sending a session establishment response message to the MME through the SGW.

Step 206: the MME allocates a new GUTI and a tracking area identification list (TAIlist) for the UE, carries the new GUTI and the TAIlist in an attachment response message and returns the attachment response message to the UE, and also carries a default bearer activation request message in the attachment response message.

Step 207: and the UE receives the allocated GUTI and TAIlist and sends an attachment completion message to the MME after finishing the establishment of the default bearer.

Step 208: the UE moves to a Routing Area (RA) of UTRAN/GERAN, the UE initiates a routing area update request message, maps the obtained GUTI into P-TMSI, and the GUTI identification is carried in the request message.

Step 209: and the SGSN acquires the context information of the UE from the MME.

Step 210: after finishing various checks on the UE, the MME returns the context information of the UE to the SGSN. If the MME supports the ISR function, the returned context response also carries ISR capability information for indicating that the MME supports the ISR function.

Step 211: the SGSN checks if a reselection of the S-GW is required and if not and the SGSN also supports the ISR function, the SGSN considers that the ISR function can be activated. Adding an ISR activation indication in the context response to inform the MME that the UE context can be continuously maintained.

Step 212: SGSN sends load updating request to S-GW, the load updating request carries ISR activating indication for informing S-GW that ISR function is activated.

Step 213: S-GW sets ISR activation mark locally and sends load update response to SGSN.

Step 214: the SGSN carries its own address or coding information in the location update request sent to the HSS.

Step 215: and the HSS judges that the current access is SGSN and judges to execute double registration, namely, the HSS does not need to send a position canceling request to the previously registered MME. And the HSS returns a location updating response message carrying the subscription information of the UE to the SGSN.

Step 216: and the SGSN sends a routing area update acceptance message to the UE, wherein the routing area update acceptance message carries an ISR activation instruction and the P-TMSI distributed by the SGSN to the UE.

Step 217: and the UE returns a routing area updating completion message to the SGSN.

As can be seen from the flow shown in fig. 2, for the UE activated by ISR, the mobility management entity (MME or SGSN) needs to keep valid context information in both networks, so as to ensure that signaling plane information such as subsequent paging for the UE can be respectively sent from the S-GW to the MME and the SGSN; meanwhile, the SGW also needs to simultaneously retain the relevant information of the MME and the SGSN, thereby ensuring that the subsequent signaling and downlink data notification message can be simultaneously notified to the two network elements of the MME and the SGSN. In the state of activating ISR, although registration can be kept valid under two RATs at the same time, the UE can only keep the activated state under one RAT at a time.

In the prior art, if subscription data of a user changes, a bearer quality of service (QoS) modification process may be triggered, and at this time, ISR is not activated, that is, UE is only registered and valid in MME or SGSN. Specifically, as shown in fig. 3, fig. 3 is a schematic flow diagram of existing bearer modification, and an MME is taken as an example in fig. 3 to describe:

step 301: HSS initiates a signing data modification process, and issues the updated signing data of UE by inserting the user signing data message.

Step 302: and the MME returns a subscription data insertion response message to the HSS.

Step 303: the MME determines that subscription data, such as QoS, associated with the currently activated bearer changes.

Step 304 to step 305: and the MME initiates a bearer modification command to the PGW through the SGW, and the bearer modification command carries the QoS parameters after subscription change.

Step 306 to step 307: and the PGW judges whether to execute QoS modification according to the received QoS parameters after subscription change, and if the QoS modification is required, the PGW sends a bearer updating request message to the MME through the SGW, wherein the modified QoS parameters are carried in the bearer updating request message. In this step, it is known to those skilled in the art to determine whether or not modification is required and how to modify the modification, and the specific implementation thereof is not related to the present invention and will not be described in detail herein.

Step 308: and the MME sends a paging message to the eNB when discovering that the UE is in an idle state, and the eNB pages the UE.

Step 309: and the UE initiates a service request message to the MME through the eNB.

Step 310: the MME sends an initial context establishment request to the eNB, and the initial context establishment request carries context information of the UE and contains QoS parameters related to UE bearer.

Step 311: and the eNB establishes a wireless air interface bearer for the UE.

Step 312: and the eNB returns an initial context response message to the MME, and the initial context response message carries the tunnel end identification and the address information of the eNB.

Step 313 to step 314: and the MME sends the tunnel end identification and the address information of the eNB to the SGW.

Step 315: and the MME informs the UE of the QoS of the bearer modified by the PGW through a modified bearer request message.

Step 316: and the UE updates the QoS information and returns a bearer modification response message to the MME.

Step 317 to step 318: and the MME returns an update bearing response message to the PGW through the SGW.

The steps 313 to 314 are executed without any sequence from the step 315 to the step 318.

If the MME finds the UE in the connected state in step 308, steps 308 to 314 may be omitted.

As can be seen from the flow shown in fig. 3, if the UE has activated the ISR function, when the subscription data of the HSS changes, the HSS inserts the subscription data into both the MME and the SGSN. However, since the MME and the SGSN do not know the state in the other access network, in order to ensure that the UE, the SGW, and the PGW can obtain the updated QoS parameters in time, the MME and the SGSN need to initiate a bearer modification process to the SGW and the PGW at the same time. In the existing bearer modification process, excessive core network signaling can be caused because the states of the UEs are not distinguished.

Disclosure of Invention

In view of the above, the present invention provides a method and a system for bearer modification, which can reduce unnecessary signaling transmission, thereby reducing core network signaling.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a bearer modification method, comprising:

the method comprises the steps that a Service Gateway (SGW) receives a bearer modification command from a mobile management entity, the states of User Equipment (UE) in a first access network and a second access network are judged, when the UE is in an idle state in one access network and in a connected state in the other access network, for the access network in which the UE is in the connected state, the mobile management entity carries out bearer modification according to a quality of service (QoS) parameter sent by a packet data gateway (PGW); for an access network with UE in an idle state, the SGW informs a mobile management entity that the bearer modification fails; the modification bearing command comprises changed signing QoS parameters;

the UE has activated an idle mode reduction signaling ISR function in a first access network and a second access network.

The mobile management entity carrying out bearer modification according to the QoS parameter issued by the PGW comprises the following steps:

in the process of modifying the bearer, if the mobile management entity in the access network where the UE is in the connected state or the UE enters the connected state judges that the received quality of service QoS parameter delivered by the PGW from the SGW is consistent with the subscribed QoS parameter, the UE is notified to continue to maintain the ISR function.

If the mobility management entity in the access network in the connected state of the UE determines that the received QoS parameter delivered by the PGW from the SGW is inconsistent with the subscribed QoS parameter, the method further includes: and informing the UE to deactivate the ISR function.

The SGW notifying the mobility management entity of the bearer modification failure includes:

the SGW informs a mobile management entity in an idle access network that the reason for failure of bearer modification is that the UE is in a connected state in another access network, and meanwhile, the mobile management entity in the idle access network stores the received QoS parameters in the subscription data sent by the HSS and marks that the UE does not finish the bearer modification process under the access network.

Before the SGW sends the notification, the method further includes:

and the SGW judges whether the QoS parameter carried in the modification bearing command is consistent with the QoS parameter carried in the update bearing request issued by the PGW, and if not, the SGW continues to execute the step of sending the bearing modification failure message.

the SGW sends the QoS parameter delivered by the PGW to a mobility management entity in an access network in which the UE is in an idle state, and notifies that the reason for the failure of bearer modification is that the UE is in a connected state in another access network, and meanwhile, the mobility management entity in the access network in the idle state of the UE stores the received QoS parameter delivered by the PGW and does not mark that the UE does not complete the bearer modification process under the access network.

the SGW judges whether the QoS parameter carried in the bearer modification command is consistent with the QoS parameter carried in the bearer updating request issued by the PGW, if so, the SGW informs the bearer modification failure reason that the UE is in a connected state under another access network and the QoS modification is successful, the mobile management entity in the access network of the UE in an idle state stores the received QoS parameter in the subscription data issued by the HSS and does not need to mark that the UE does not finish the bearer modification process under the access network.

A bearer modification system comprising at least a serving gateway, SGW, a mobility management entity and a UE, wherein,

the SGW is used for receiving a bearer modification command from the mobile management entity, judging the states of the UE in the first access network and the second access network, and carrying out bearer modification on the access network in which the UE is in a connected state according to the QoS parameter issued by the PGW for the access network in which the UE is in a connected state when the UE is in an idle state in one of the access networks and in the other access network; for an access network with UE in an idle state, notifying a mobile management entity in the access network that bearer modification fails; the modification bearing command comprises changed signing QoS parameters;

the mobile management entity is used for receiving the request from the SGW and carrying out bearer modification or returning bearer modification failure according to the request;

The step of carrying out bearer modification by the mobility management entity in the access network according to the QoS parameter delivered by the PGW specifically includes:

in the process of modifying the load, if the mobile management entity in the access network where the UE is in the connected state or the UE enters the connected state judges that the received QoS parameter delivered by the PGW from the serving gateway is consistent with the subscribed QoS parameter, the UE is notified to continue to maintain the ISR function.

And if the mobile management entity in the access network in the connected state of the UE judges that the received QoS parameter issued by the PGW from the SGW is inconsistent with the signed QoS parameter, the mobile management entity in the access network in the connected state of the UE is also used for informing the UE of deactivating the ISR function.

The notifying, by the SGW, of a bearer modification failure by the mobility management entity specifically includes:

The SGW is further configured to determine, before sending the notification, whether the QoS parameter carried in the bearer modification command is consistent with the QoS parameter carried in the update bearer request issued by the PGW, and if not, continue to send the bearer modification failure message.

The SGW is further configured to determine whether the QoS parameter carried in the bearer modification command is consistent with the QoS parameter carried in the update bearer request issued by the PGW, if so, the SGW notifies the bearer modification failure that the UE is in a connected state in another access network and the QoS modification is successful, and the mobility management entity in the access network in the idle state of the UE maintains the received QoS parameter in the subscription data issued by the HSS and does not mark that the UE does not complete the bearer modification process in the access network.

The first access network is a universal terrestrial radio access network/GSMEDGE radio access network UTRAN/GERAN or an evolved universal terrestrial radio access network E-UTRAN, wherein the mobile management entity is a serving GPRS support node SGSN or a mobile management unit MME; the second access network is E-UTRAN or UTRAN/GERAN, and the mobile management entity is MME or SGSN.

It can be seen from the above technical solutions provided by the present invention that, the serving gateway receives a bearer modification command from the mobility management entity, determines the states of the UE in the first access network and the second access network, and modifies the bearers according to the existing method if the UE is in an idle state in both the first access network and the second access network; if the UE is in an idle state in one access network and is in a connected state in the other access network, the mobile management entity carries out bearing modification on the access network in which the UE is in the connected state according to the request of the service gateway; for the access network with the UE in an idle state, the service gateway informs the mobility management entity that the bearer modification fails. The invention distinguishes the current state of the UE through the SGW, and further adopts different bearer modification modes, thereby reducing unnecessary signaling transmission and further reducing core network signaling.

Drawings

Fig. 1 is a schematic diagram of a conventional EPS architecture;

fig. 2 is a schematic flowchart illustrating an existing UE activating an ISR function;

fig. 3 is a schematic flow chart of a conventional bearer modification;

fig. 4 is a flow chart of a bearer modification method of the present invention;

FIG. 5 is a schematic structural diagram of a load modification system according to the present invention;

fig. 6 is a flowchart of a first embodiment of a bearer modification method according to the present invention;

fig. 7 is a flowchart of a bearer modification method according to a second embodiment of the present invention.

Detailed Description

Fig. 4 is a flowchart of a bearer modification method according to the present invention, as shown in fig. 4, including the following steps:

step 400: the serving gateway receives a modify bearer command from the mobility management entity.

When the subscription data of the user changes, the HSS initiates a subscription data modification process, and issues the updated subscription data of the UE to the mobile management entity by inserting a user data message; the mobile management entity judges that the QoS parameter in the subscription data related to the currently activated bearer changes, and sends a bearer modification command to the service gateway to trigger a bearer modification process. The specific implementation of this step is well known to those skilled in the art and will not be described herein.

The mobility management entity may be an MME in an LTE access system or an SGSN in a GERAN/UTRAN access system.

Step 401: the service gateway judges the states of the UE in the first access network and the second access network, and if the UE is in an idle state in both the first access network and the second access network, the step 402 is carried out; if the UE is in idle state in one of the access networks and in connected state in the other access network, go to step 403.

In the invention, the UE activates the ISR function in the first access network and the second access network.

Step 402: the bearer modification is performed according to existing methods. The flow is ended.

For the UE with the activated ISR function, and when the states of the UE in the first access network and the second access network are both idle states, the bearer modification may be performed according to the existing method shown in fig. 3.

Step 403: for the access network with the UE in the connected state, the mobile management entity carries out bearing modification according to the QoS parameter issued by the PGW; for the access network with the UE in an idle state, the service gateway informs the mobility management entity that the bearer modification fails.

In this step, for the access network where the UE is in the connected state, the method for modifying the bearer of the QoS parameter delivered by the mobile management entity root PGW may adopt the existing method shown in fig. 3, or further during the bearer modification, the mobile management entity in the access network where the UE is in the connected state or where the UE enters the connected state determines whether the received QoS parameter delivered by the PGW from the serving gateway is consistent with the subscribed QoS parameter, and notifies the UE whether to continue to maintain the ISR function according to the determination result: if the ISR function is consistent with the ISR function, the UE is informed to continue to maintain the ISR function; and if not, informing the UE to deactivate the ISR function.

For the access network with the UE in the idle state, the method for the serving gateway to notify the mobility management entity of the bearer modification failure may be that the serving gateway notifies the mobility management entity in the access network in the idle state, the reason for the bearer modification failure is that the UE is in a connected state in another access network, and meanwhile, the mobility management entity stores the received QoS parameter in the subscription data issued by the HSS and marks that the UE does not complete the bearer modification process under the access network;

in this case, the method may further include: the service gateway judges whether the QoS parameter carried in the bearer modification command is consistent with the QoS parameter carried in the update bearer request issued by the PGW, if so, the service gateway informs the bearer modification failure reason that the UE is in a connected state under another access network and the QoS modification is successful, and if not, the service gateway informs the mobile management entity of the information that the UE is in the connected state under the another access network; and the mobile management entity executes the following operations according to the indication information: if the indication is that the UE is in a connected state under another RAT and the QoS modification is successful, the mobility management entity maintains the modified QoS, and if the indication is that the UE is in a connected state under another RAT, the mobility management entity locally saves the HSS modified QoS and marks that the UE does not complete the bearer modification process under the access network.

For the access network where the UE is in the idle state, the serving gateway may also notify the mobility management entity that the bearer modification fails, where the serving gateway sends the QoS parameter delivered by the PGW to the mobility management entity in the access network where the UE is in the idle state, and notifies that the reason for the bearer modification failure is that the UE is in a connected state in another access network, and meanwhile, the mobility management entity in the access network where the UE is in the idle state stores the received QoS parameter delivered by the PGW and does not need to mark that the bearer modification process of the UE is not completed in the access network.

For an access network in which the UE is in an idle state, the method for the serving gateway to notify the mobility management entity that bearer modification fails may also be: the service gateway judges whether the QoS parameter carried in the bearer modification command is consistent with the QoS parameter carried in the update bearer request issued by the PGW, if so, the service gateway informs the bearer modification failure reason of the information that the UE is in a connected state under another access network and the QoS modification is successful, and the mobile management entity in the access network in the idle state of the UE stores the received QoS parameter in the subscription data issued by the HSS and does not need to mark that the UE does not finish the bearer modification process under the access network;

in steps 402 to 404 of the method of the present invention, when receiving a bearer modification command, the serving gateway distinguishes states of UEs in different access networks, and for a UE that has activated an ISR function and is in a connected state in one of the access networks and is in an idle state in the other access network, a different bearer modification method is adopted according to a difference in the UE states. The invention distinguishes the current state of the UE through the SGW, and further adopts different bearer modification modes, thereby reducing unnecessary signaling transmission and further reducing core network signaling.

Fig. 5 is a schematic view of a structure of the bearer modification system of the present invention, and as shown in fig. 5, the bearer modification system at least includes a serving gateway, a mobility management entity, and a UE, wherein,

the service gateway is used for receiving a bearer modification command from the mobile management entity, judging the states of the UE in the first access network and the second access network, and informing the mobile management entities in the two access networks to modify the bearers according to the existing method when the UE is in an idle state in the two access networks; when the UE is in an idle state in one of the access networks and is in a connected state in the other access network, carrying and modifying the access network in which the UE is in the connected state by a mobile management entity in the access network according to the QoS parameter issued by the PGW; and for the access network with the idle UE, informing a mobile management entity in the access network that the bearer modification fails.

And the mobile management entity is used for receiving the request from the service gateway and carrying out bearer modification or returning a bearer modification failure according to the request.

The step of carrying out bearer modification by the mobility management entity in the access network according to the QoS parameter delivered by the PGW specifically includes: carrying out bearing modification according to the existing method; or,

in the process of modifying the bearer, if the mobility management entity in the access network in which the UE is in the connected state determines that the received QoS parameter of the service quality delivered by the PGW from the serving gateway is consistent with the subscribed QoS parameter, the UE is notified to continue to maintain the ISR function.

And if the mobile management entity in the access network in the connected state of the UE judges that the received QoS parameter issued by the PGW from the serving gateway is inconsistent with the signed QoS parameter, the mobile management entity in the access network in the connected state of the UE is also used for informing the UE of deactivating the ISR function.

The step of informing, by the serving gateway, the mobility management entity of the bearer modification failure specifically includes:

the reason why the serving gateway notifies the modification failure is that the UE is in a connected state in another access network, and meanwhile, the mobility management entity in the access network in which the UE is in an idle state stores the received QoS parameter in the subscription data issued by the HSS, and marks that the UE does not complete the bearer modification process under the access network.

The service gateway sends the QoS parameter issued by the PGW to a mobility management entity in an access network of the UE in an idle state, and informs the reason of failure of bearer modification that the UE is in a connected state in another access network, meanwhile, the mobility management entity in the access network of the UE in the idle state stores the received QoS parameter issued by the PGW and does not need to mark that the UE does not finish the bearer modification process under the access network.

The serving gateway is further configured to determine whether a QoS parameter carried in the bearer modification command is consistent with a QoS parameter carried in an update bearer request issued by a PGW, if so, the serving gateway notifies a bearer modification failure reason that the UE is in a connected state in another access network and the QoS parameter modification is successful, and a mobility management entity in an access network in which the UE is in an idle state stores the received QoS parameter in subscription data issued by an HSS and does not need to mark that the UE does not complete a bearer modification process in the access network;

in the invention, the first access network is UTRAN/GERAN or E-UTRAN, the mobile management entity is SGSN or MME, the second access network is E-UTRAN or UTRAN/GERAN, and the mobile management entity is MME or SGSN.

The process of the present invention will be described in detail with reference to examples.

Fig. 6 is a flowchart of a first embodiment of a bearer modification method according to the present invention, in the first embodiment, it is assumed that the UE has activated an ISR function, i.e. maintains a registration state at the same time at an SGSN (first mobility management entity) and an MME (second mobility management entity), and is assumed that the UE is in a connected state in one of the RATs, and in the present embodiment, it is assumed that the UE is in a connected state in UTRAN/GERAN and is in an idle state in E-UTRAN. As shown in figure 6 of the drawings,

in UTRAN/GERAN, comprising:

step 601 a: HSS initiates a subscription data modification process, and issues the updated subscription data of UE to SGSN by inserting user data message.

Step 602 a: SGSN returns the insert signing data modification response message to HSS.

Step 603 a: and the SGSN judges that the QoS parameter related to the currently activated bearer changes according to the acquired subscription data, and the UE activates the ISR and is in a connected state.

In step 604a, the SGSN performs a relevant procedure for QoS modification in the prior art, and the specific implementation is shown in fig. 3, which is not described herein again. Thus, bearer modification of the UE in UTRAN/GERAN is completed.

In the E-UTRAN, comprising:

step 601 b: HSS initiates a subscription data modification process, and issues the updated subscription data of UE by inserting user data message.

Step 602 b: and the MME returns an insert subscription data modification response message to the HSS.

Step 603b, the MME determines that the QoS parameter related to the currently activated bearer changes according to the obtained subscription data, and the UE activates the ISR and is in an idle state.

Step 604 b: and the MME sends a bearer modification command to the SGW, and the modified QoS parameters are carried in the bearer modification command.

Step 605 b: and the SGW judges that the bearer modification command does not need to be sent to the PGW according to the fact that the UE activates the ISR and the other RAT, namely the GERAN/UTRAN, is in a connected state.

Step 606 b: and the SGW returns a bearing modification failure message to the MME, and the bearing modification failure message carries indication information for informing the UE of being in a connected state under another RAT.

The indication information may be indicated by extending a cause (cause) value in an existing bearer modification failure message, or an element (IE) is added in the bearer modification failure message to carry the indication message, or an additional message is used to carry the indication information.

Step 607 b: after receiving the notification, the MME locally stores the QoS parameters modified by the HSS and marks that the UE does not finish the bearer modification process under EUTRAN.

The specific implementation of the case where the UE is in the connected state in the E-UTRAN and in the idle state in the UTRAN/GERAN is similar to the flow shown in fig. 6, and on the basis of fig. 6, those skilled in the art are easy to obtain, and details are not described here.

Fig. 7 is a flowchart of a second embodiment of the bearer modification method of the present invention, in the second embodiment, it is assumed that the UE has activated the ISR function, i.e. maintains the registration status at the same time at the SGSN (first mobility management entity) and the MME (second mobility management entity); and the UE is in a connected state in one of the RATs, in this embodiment, it is assumed that the UE is in a connected state in UTRAN/GERAN and in an idle state in E-UTRAN. As shown in figure 7 of the drawings,

in UTRAN/GERAN, comprising:

step 701 a: HSS initiates a subscription data modification process, and issues the updated subscription data of UE to SGSN by inserting user data message.

Step 702 a: SGSN returns the insert signing data modification response message to HSS.

Step 703 a: and the SGSN judges that the QoS parameter related to the currently activated bearer changes according to the acquired subscription data, and the UE activates the ISR and is in a connected state.

Step 704 a: and the SGSN sends a bearer modification command to the SGW, and the modified QoS parameters are carried in the bearer modification command.

Step 705a to step 706 a: and the SGW sends a bearer modification command to the PGW according to the fact that the UE activates the ISR and judges that the UE is in a connected state under the current RAT (namely GERAN/UTRAN), and the modified bearer modification command carries the modified QoS parameters.

Steps 707a to 708 a: the PGW judges whether to execute QoS modification according to the received modified QoS parameters, if so, the PGW sends a bearer updating request message to the SGSN through the SGW, and the modified QoS parameters are carried in the bearer updating request message. In this step, whether the PGW needs to modify the QoS parameter belongs to a conventional technical means of those skilled in the art, and is not described here again.

Step 709 a: and the SGSN compares the QoS parameters carried in the updating bearing request with the signed QoS parameters to judge whether the QoS parameters are consistent with the signed QoS parameters.

Step 710 a: if the determination result in step 709a is consistent, the SGSN notifies the UE of the QoS parameter of the bearer modified by the PGW through a bearer modification request message, where the bearer modification request message also carries ISR indication information activated by the ISR; if the determination result in step 709a is inconsistent, the SGSN notifies the UE of the QoS parameter of the bearer modified by the PGW through the modified bearer request message, where the modified bearer request message does not carry ISR indication information activated by the ISR, which indicates that the UE deactivates the ISR function.

The indication information in this step may be indicated by extending a cause (cause) value in an existing bearer modification failure message, or an element (IE) is added in the bearer modification failure message to carry the indication message, or an additional message is used to carry the indication information.

The indication information may be explicit or implicit. Display carry refers to whether an indication of activation must be carried in the message. Implicit carry means that if an indication is carried in a message, the indication indicates one case (ISR deactivation or ISR activation reservation), and no indication is carried in the message.

Step 711 a: UE updates QoS information and decides whether to keep ISR activation according to ISR indication information in the modification bearing request message, and UE returns a modification bearing response message to SGSN.

Step 712a to step 713 a: and the SGSN returns an update bearing response message to the PGW through the SGW.

Thus, the modification of the UE in the UTRAN/GERAN is completed.

In the E-UTRAN, comprising:

step 701 b: HSS initiates a subscription data modification process, and issues the updated subscription data of UE by inserting user data message.

Step 702 b: and the MME returns an insert subscription data modification response message to the HSS.

Step 703 b: and the MME judges that the QoS parameters related to the currently activated bearer change according to the acquired subscription data, and the UE activates the ISR and is in an idle state.

Step 704 b: and the MME sends a bearer modification command to the SGW, and the modified QoS parameters are carried in the bearer modification command.

Step 705 b: the SGW determines that it is not necessary to send a bearer modification command to the PGW, depending on the UE activating ISR and the other RAT, i.e. connected in GERAN/UTRAN.

Step 706 b: the SGW waits for the QoS parameter carried in the update bearer request returned by the PGW in step 707a, and determines whether the QoS parameter is the same (identical) as the QoS parameter contained in step 704a or 704b, and if so, the SGW returns a bearer modification failure message to the MME, and notifies the UE of indication information that the UE is in a connected state under another RAT and the QoS modification is successful; if not, the SGW returns a bearing modification failure message to the MME to inform the UE of indicating information in a connected state under another RAT.

Optionally, the SGW may further include the QoS parameter modified by the PGW in the bearer modification failure message.

In this step, the indication information may be indicated by extending a cause (cause) value in an existing bearer modification failure message, or an element (IE) is added in the bearer modification failure message to carry the indication message, or an additional message is used to carry the indication information.

Step 707b, after receiving the notification, the MME performs subsequent operations according to the indication information in the bearer modification failure message: if the indication information is to inform the UE of being in a connected state under another RAT and the QoS modification is successful, the MME keeps the modified QoS and does not need to mark that the UE does not finish the bearer modification process under the access network; if the indication information is that the UE is in a connected state under another RAT and the notification message does not carry the modified QoS parameters, the MME locally stores the QoS modified by the HSS and marks that the UE does not finish the bearer modification process under the EUTRAN; if the indication information is that the UE is in a connected state under another RAT and the notification message carries the modified QoS parameters, the MME maintains the modified QoS and does not need to mark that the UE does not finish the bearer modification process under the access network.

The specific implementation of the case where the UE is in the connected state in the E-UTRAN and in the idle state in the UTRAN/GERAN is similar to the flow shown in fig. 7, and on the basis of fig. 7, those skilled in the art are easy to obtain, and details are not described here.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims

1. A method for bearer modification, comprising:

2. The bearer modification method according to claim 1, wherein the performing, by the mobility management entity, bearer modification according to the QoS parameter delivered by the PGW includes:

3. The bearer modification method according to claim 2, wherein if the mobility management entity in the access network in the connected state of the UE determines that the received QoS parameter delivered by the PGW from the SGW is inconsistent with the subscribed QoS parameter, the method further comprises: and informing the UE to deactivate the ISR function.

4. The bearer modification method according to claim 1, wherein the SGW notifying the mobility management entity of the failure of bearer modification comprises:

5. The bearer modification method according to claim 4, wherein the SGW sends the notification before, the method further comprising:

6. The bearer modification method according to claim 1, wherein the SGW notifying the mobility management entity of the failure of bearer modification comprises:

7. The bearer modification method according to claim 1, wherein the SGW notifying the mobility management entity of the failure of bearer modification comprises:

8. A bearer modification system, characterized by comprising at least a serving gateway, SGW, a mobility management entity and a UE, wherein,

9. The bearer modification system according to claim 8, wherein the bearer modification performed by the mobility management entity in the access network according to the delivered QoS parameter of the PGW specifically includes:

10. The bearer modification system according to claim 9, wherein if the mobility management entity in the access network in the connected state of the UE determines that the received QoS parameter delivered by the PGW from the SGW is inconsistent with the subscribed QoS parameter, the mobility management entity in the access network in the connected state of the UE is further configured to notify the UE to deactivate the ISR function.

11. The bearer modification system according to claim 10, wherein the SGW notifying the mobility management entity of the bearer modification failure specifically comprises:

12. The bearer modification system of claim 11,

13. The bearer modification system according to claim 10, wherein the SGW notifying the mobility management entity of the bearer modification failure specifically comprises:

14. The bearer modification system of claim 10,

15. The bearer modification system according to claim 10, wherein the first access network is a universal terrestrial radio access network/gsm edge radio access network UTRAN/GERAN or an evolved universal terrestrial radio access network E-UTRAN, and wherein the mobility management entity is a serving GPRS support node SGSN or a mobility management unit MME; the second access network is E-UTRAN or UTRAN/GERAN, and the mobile management entity is MME or SGSN.