WO2012149894A1

WO2012149894A1 - Method and device for transmitting data in circuit switched fallback

Info

Publication number: WO2012149894A1
Application number: PCT/CN2012/075002
Authority: WO
Inventors: 刘海; 吴晓波
Original assignee: 华为技术有限公司
Priority date: 2011-05-05
Filing date: 2012-05-03
Publication date: 2012-11-08
Also published as: CN102769932A; CN102769932B

Abstract

Disclosed are a method and a device for transmitting data in circuit switched fallback. The method comprises: receiving a resource release request message sent by a base station; determining, according to the resource release request message, that an operation of suspending a packet switched service is not performed; and sending an access bearer release request message comprising a stop instruction to a serving gateway, the stop instruction being used for instructing the serving gateway not to send a downlink data notification message triggered by the packet switched service. The device comprises: a receiving module, a determination module and a sending module. With the method and device in the present invention, an access bearer release request message comprising a stop instruction is sent to the serving gateway, so that the serving gateway can be prevented from sending a downlink data notification message triggered by a packet switched service to a mobility management entity when a terminal equipment falls back to a circuit switched network, so as to reduce load of the mobility management entity as well as overhead of a system.

Description

Method and apparatus for data transmission in circuit domain fallback This application claims to be filed on May 5, 2011, the application number is 201110115164.5, and the invention name is "method and device for data transmission in circuit domain fallback" Priority of the Chinese application, the entire contents of which are incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and more particularly to a method and apparatus for data transmission in circuit domain fallback in the field of communications.

Background technique

At present, the telecommunication network develops into a Long Term Evolution (LTE) network, which can provide higher data throughput. In an LTE network, a voice service can be provided using a circuit back to CS (CS Fallback) technology. The CSFB technology refers to the user equipment (User Equipment, called "UE") attached to the LTE network. When the UE needs to perform voice services, it can fall back to the 2G/3G network in some ways, and then can be in the 2G/3G CS.

(Circuit Switch, called "CS") The voice service is carried out in the network.

The fallback method adopted in CSFB technology generally includes three methods: Packet switched domain switching

(Packet Switch handover, "PS Handover"), Network Assisted Cell Change/Cell Change Order (Network Assisted Cell Change/Cell Change Order)

"NACC/CCO" mode and redirection method. The NACC/CCO mode may be a base station, such as an evolved base station (Evolved NodeB, called "ΈΝΒ"), which sends a CCO command to the UE, instructing the UE to select the designated 2G/3G cell, if the CCO command includes the specified 2G. The system message of the /3G cell, then the CCO command can be called NACC; the Redirection mode refers to redirecting to the 2G/3G cell, and the specific mode can use the radio resource control protocol for the ENB.

(Radio Resource Control, referred to as "RRC") Connection Release (RRC Connection Release) message, which may carry a series of carrier frequencies or cell identifiers, indicating that the UE accesses the 2G/3G indicated by the series of carrier frequencies or cell identifiers. The cell may also carry system messages of some cells. If the UE rolls back to the 2G/3G CS network through the NACC/CCO mode or the Redirection mode, the ENB notifies the Mobility Management Entity ("MME") to release the access network bearer resources, if the UE returns After returning to the 2G/3G network, the CS service needs to be carried out while continuing the PS service. The ENB can carry the circuit domain fallback trigger cause value in the message that the ENB notifies the MME to release the bearer resources of the access network, that is, the CSFB triggered cause. value.

After the UE retreats from the LTE network to the 2G/3G network, in the process of deleting the bearer resources of the access network to re-establish the bearer resources of the access network, there is a possibility that downlink data needs to be transmitted to the UE. In the process, when the SGW receives the downlink data, the SGW sends a Downlink Data Notification message to the MME, which causes waste of network resources and increases the load of the MME. Summary of the invention

Embodiments of the present invention provide a method and apparatus for data transmission in circuit domain fallback, which can reduce the load of a mobility management entity.

In one aspect, an embodiment of the present invention provides a method for data transmission in a circuit domain fallback, the method comprising: receiving a resource release request message sent by a base station; determining, according to the resource release request message, not performing a packet switch service And sending a release access bearer request message to the serving gateway according to the resource release request message, where the release access bearer request message includes a stop indication, where the stop indication is used to indicate that the service gateway does not send the downlink triggered by the packet switched service The present invention provides a method for data transmission in a circuit domain fallback, the method comprising: receiving a release access bearer request message sent by a mobility management entity, the release access bearer The request message includes a stop indication, which is used to indicate that the downlink data notification message triggered by the packet switched service is not sent to the mobility management entity; and the bearer resource of the access network is released according to the release access bearer request message.

In another aspect, an embodiment of the present invention provides a device for data transmission in circuit domain fallback. The device includes: a receiving module, configured to receive a resource release request message sent by the base station; a determining module, configured to determine, according to the resource release request message received by the receiving module, that the packet switching service suspension operation is not performed; The resource release request message received by the receiving module sends a release access bearer request message to the serving gateway, where the release access bearer request message includes a stop indication, where the stop indication is used to indicate that the serving gateway does not send the downlink triggered by the packet switched service Data notification message.

In another aspect, an embodiment of the present invention provides an apparatus for data transmission in a circuit domain fallback, where the apparatus includes: a receiving module, configured to receive a release access bearer request message sent by a mobility management entity, where the release The inbound bearer request message includes a stop indication, which is used to indicate that the downlink data notification message triggered by the packet switching service is not sent to the mobility management entity, and a release module, configured to receive the release access bearer request message according to the receiving module Release the bearer resources of the access network.

Based on the foregoing technical solution, the method and apparatus for data transmission in circuit domain fallback according to the embodiment of the present invention can prevent the serving gateway from falling back to the terminal device by sending a release access bearer request message including a stop indication to the serving gateway. During the circuit-switched network, the downlink data notification message triggered by the packet-switched service is sent to the mobility management entity, and the MME is unable to page the UE because the UE has left the LTE, thereby causing the MME to be overloaded, thereby reducing the mobility. The load of the management entity reduces the system overhead. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

1 is a schematic flow chart of a method for data transmission in circuit domain fallback according to an embodiment of the present invention;

2 is a schematic flowchart of a method for data transmission in circuit domain fallback according to another embodiment of the present invention; 3 is a schematic flowchart of a method for data transmission in circuit domain fallback according to still another embodiment of the present invention;

4 is a schematic flow chart of a method for data transmission in circuit domain fallback according to still another embodiment of the present invention;

5 is a schematic block diagram of an apparatus for data transmission in circuit domain fallback according to an embodiment of the present invention;

6 is a schematic block diagram of an apparatus for data transmission in circuit domain fallback according to another embodiment of the present invention;

Figure 7 is a schematic block diagram of an apparatus for data transmission in circuit domain fallback in accordance with still another embodiment of the present invention. detailed description

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

FIG. 1 shows a schematic flow diagram of a method 100 for data transmission in circuit domain fallback in accordance with an embodiment of the present invention. As shown in FIG. 1, the method 100 includes:

S110. Receive a resource release request message sent by the base station.

S120, determining, according to the resource release request message, that the packet switching service suspension operation is not performed; S130, according to the resource release request message, sending a Release Access Bearer Request message to the serving gateway, where the release access bearer is released. The request message includes a stop indication, which is used to indicate that the serving gateway does not send the downlink data notification message triggered by the packet switched service.

After receiving the resource release request message sent by the ENB, the MME determines that the UE is backed off according to the resource release request message after the UE is backed up to the 2G/3G network in the NACC/CCO mode or the Redirection mode. CS service after 2G/3G network At the same time, the PS service can be performed, that is, it is determined that the packet switched service suspension operation is not performed. In order to prevent the SGW from receiving the data of the PS service, the MME is overloaded by sending the downlink data notification message to the MME, and the MME sends a release access bearer request message to the serving gateway, where the release access bearer request message is used to indicate The SGW releases the bearer resource that is connected to the base station, and the release access bearer request message further includes a stop indication, where the stop indication is used to indicate that the serving gateway does not send the downlink data notification message triggered by the packet switched service.

Therefore, the method for data transmission in circuit domain fallback according to the embodiment of the present invention can prevent the serving gateway from falling back to the circuit switched network during the terminal device by sending a release access bearer request message including the stop indication to the serving gateway. The mobility management entity sends a downlink data notification message triggered by the packet switching service, and avoids that the MME cannot page the UE because the UE has left the LTE, thereby causing the MME to be overloaded, thereby reducing the load of the mobility management entity. , reduce system overhead.

In the embodiment of the present invention, after receiving the resource release request message, the mobility management entity may determine that the packet switching service suspension operation is not performed according to the circuit domain fallback trigger cause value carried in the resource release request message. That is, if the reason value carried in the resource release request message is CSFB Triggered, it indicates that the UE can perform the PS service while performing the CS service after the UE is rolled back to the 2G/3G network, and does not perform the PS service suspension operation. Therefore, based on the CSFB Triggered cause value carried by the resource release request message, it can be determined that the packet switched service suspend operation is not performed.

In the embodiment of the present invention, the stop indication included in the release access bearer request message is used to instruct the SGW to stop sending the downlink data notification message triggered by the PS service to the MME. Optionally, the stop indication includes a pause downlink packet notification request indication, and is used to instruct the SGW to suspend sending a downlink data notification message triggered by the PS service to the MME. Optionally, the stop indication includes a Delay Downlink Packet Notification Request (instruction), configured to instruct the SGW to delay sending a downlink data notification message triggered by the PS service to the MME. In this embodiment of the present invention, the stop indication may be carried in a delayed downlink packet notification request field newly added by the release access bearer request message. Certainly, the stop indication may also be carried in the other addition of the release access bearer request message. In the field.

2 shows a schematic flow diagram of a method 200 for data transmission in circuit domain fallback, in accordance with another embodiment of the present invention. As shown in FIG. 2, the method 200 includes:

In S210, the serving gateway receives a release access bearer request message sent by the mobility management entity, where the release access bearer request message includes a stop indication, where the stop indication is used to indicate that the packet switched service trigger is not sent to the mobility management entity. Downstream data notification message.

Optionally, the stop indication is carried in a delayed downlink packet notification request field newly added by the release access bearer request message. Optionally, the stop indication includes a delayed downlink packet notification request indication, and is used to instruct the SGW to delay sending a downlink data notification message triggered by the PS service to the MME. Optionally, the stop indication includes a pause downlink packet notification request indication, and is used to instruct the SGW to suspend sending a downlink data notification message triggered by the PS service to the MME.

In S220, the serving gateway releases the bearer resource of the access network according to the release access bearer request message. The serving gateway does not send a downlink data notification message triggered by the packet switching service to the mobility management entity according to the stop indication in the release access bearer request message, thereby avoiding the mobility management entity load boosting port.

The method for data transmission in circuit domain fallback according to the embodiment of the present invention can prevent the serving gateway from moving to the mobility of the terminal device during the fallback of the terminal device to the circuit switched network by sending the release access bearer request message including the stop indication to the serving gateway. The management entity sends a downlink data notification message triggered by the packet switching service, and avoids that the MME cannot page the UE because the UE has left the LTE, thereby causing the MME to be overloaded, thereby reducing the load of the mobility management entity. Small system overhead.

In the embodiment of the present invention, after receiving the release access bearer request message sent by the mobility management entity, the serving gateway may determine, according to the value of the status bit, the downlink data notification message that is not triggered by the packet switching service. The value of the status bit is determined by the stop indication included in the Release Access Bearer Request message. Specifically, whether the downlink data notification message is sent may be determined according to whether the status bit is 0 or 1. For example, the serving gateway determines to not send the downlink data notification message according to the status bit being 0.

It should be understood that, in the embodiment of the present invention, the stop indication corresponds to a higher priority than the received number. According to the corresponding priority. For example, if the status bit is 1, it indicates that the serving gateway receives the data, but on the other hand, if the serving gateway also receives a stop indication indicating that the downlink data notification message is not sent to the mobility management entity, the serving gateway does not move to mobility management. The entity sends a downlink data notification message.

Optionally, as shown in FIG. 3, after the serving gateway releases the bearer resource of the access network according to the release access bearer request message, the method 300 for data transmission in the circuit domain fallback according to the embodiment of the present invention may further Includes:

S330. The serving gateway receives data of the packet switching service sent by the packet data gateway.

S340. The service gateway discards or caches the data.

The S310 and S320 included in the method 300 are the same as the S210 and S220 in the method 200, and are not described herein again.

In the process of deleting the bearer resource of the access network until the re-establishment of the bearer resource of the access network, if the SGW receives the data of the PS service sent by the packet data gateway, the SGW receives the release access bearer request message according to the received The stop indication in the middle does not send a downlink data notification message triggered by the packet switched service to the MME, and may discard or cache the data. Thereby, during the fallback of the terminal device to the circuit switched network, the load of the mobility management entity can be reduced and the system overhead can be reduced.

The following describes a process for the UE to fall back to the 2G/3G network through the NACC/CCO mode or the Redirection mode as an example, and specifically describes a method 400 for data transmission in the circuit domain fallback according to an embodiment of the present invention.

As shown in FIG. 4, when the UE needs to perform the voice service by using the CSFB technology, the UE sends an extended service request (Extended Service Request) message to the MME to indicate that the MME UE needs to perform voice service through the CSFB technology. After receiving the extended service request message, the MME sends a circuit domain fallback notification (CSFB Indication) to the ENB, as shown in S420. After receiving the circuit domain fallback notification, the ENB sends a CCO/NACC or Redirection message to the UE, as shown in S430. On the other hand, the MME sends a resource release request message, where the resource release request message carries the PS service. The 2G/3G continues indication, which is, for example, a CSFB Triggered cause value, as indicated by S440. After receiving the resource release request message sent by the ENB, the MME determines, according to the CSFB Triggered cause value in the resource release request message, that the UE can roll back to the 2G/3G network and perform the PS service, that is, the PS service is determined to be not executed. The packet switched service suspends operations. Therefore, in order to reduce the load of the MME, the MME sends a release access bearer request message to the serving gateway, where the release access bearer request message is used to indicate that the SGW releases the bearer resource connected to the base station, and the release access bearer request message is further And including a stop indication, the stop indication is used to indicate that the serving gateway does not send the downlink data notification message triggered by the packet switched service, as shown in S450. Therefore, during this period, if the SGW receives the data of the packet switched service sent by the packet data gateway, the SGW does not send the downlink data notification message triggered by the packet switched service to the MME, and may discard or cache the data.

After S430, the terminal device accesses the 2G/3G network, as shown in S460. After the terminal device accesses the 2G/3G network, the terminal device sends a location update (Routing Area Update)

The "RAU" message is sent to the 2G/3G Mobile Management Entity SGSN (Serving GPRS Support Node, called "SGSN") for restoring PS services, as shown in S470. Through the RAU process, the SGW re-establishes the access network bearer resources. In S480, the terminal device continues the voice service in the 2G/3G network. After S470, the bearer resource of the SGW access network is re-established successfully. At this time, the SGW can pass the wireless control node/base station controller (RAN control node, called "RNC,, / Base Station Controller, the tube is called "BSC"). ) Send data of the PS service to the UE.

An apparatus for data transmission in circuit domain fallback according to an embodiment of the present invention will be described below. FIG. 5 shows a schematic block diagram of an apparatus 500 for data transmission in circuit domain fallback in accordance with an embodiment of the present invention. As shown in Figure 5, the apparatus 500 includes:

The receiving module 510 is configured to receive a resource release request message sent by the base station; The determining module 520 is configured to determine, according to the resource release request message received by the receiving module 510, that the packet switching service suspension operation is not performed;

The sending module 530 is configured to send, according to the resource release request message received by the receiving module 510, a release access bearer request message to the serving gateway, where the release access bearer request message includes a stop indication, where the stop indication is used to indicate that the service gateway does not Sending a downlink data notification message triggered by the packet switching service.

The apparatus for data transmission in the circuit domain fallback according to the embodiment of the present invention can prevent the serving gateway from moving to the mobility during the terminal device fallback to the circuit switched network by sending a release access bearer request message including the stop indication to the serving gateway. The management entity sends a downlink data notification message triggered by the packet switching service, and avoids that the MME cannot page the UE because the UE has left the LTE, thereby causing the MME to be overloaded, thereby reducing the load of the mobility management entity. Small system overhead.

Optionally, the determining module 520 is further configured to determine, according to the circuit domain fallback trigger cause value carried in the resource release request message, that the packet switched service suspension operation is not performed.

Optionally, the sending module 530 is further configured to send a release access bearer request message to the serving gateway, where the newly added delayed downlink packet notification request field of the release access bearer request message carries the stop indication. Of course, the stop indication may also be carried in other newly added fields of the release access bearer request message. In the embodiment of the present invention, the stop indication includes a pause downlink packet notification request indication, and is used to instruct the SGW to suspend sending a downlink data notification message triggered by the PS service to the MME. Alternatively, the stop indication includes a delayed downlink packet notification request indication, and is used to instruct the SGW to delay sending a downlink data notification message triggered by the PS service to the MME.

Optionally, the device 500 is a mobility management entity. The above and other operations and/or functions of the entities, and the various modules of the apparatus 500, respectively, are for the purpose of implementing the corresponding processes in the methods 100 and 400 of Figures 1 and 4, and are not described herein.

FIG. 6 shows a schematic block diagram of an apparatus 600 for data transmission in circuit domain fallback in accordance with another embodiment of the present invention. As shown in FIG. 6, the apparatus 600 includes: The receiving module 610 is configured to receive a release access bearer request message sent by the mobility management entity, where the release access bearer request message includes a stop indication, where the stop indication is used to indicate that the packet switched service trigger is not sent to the mobility management entity. Downstream data notification message;

The release module 620 is configured to release the bearer resource of the access network according to the release access bearer request message received by the receiving module.

In the embodiment of the present invention, as shown in FIG. 7, the receiving module 610 is further configured to receive data of the packet switching service sent by the packet data gateway;

The apparatus 600 can also include:

The processing module 630 is configured to discard or cache the data.

In the embodiment of the present invention, the receiving module 610 includes a receiving unit and a determining unit, where the receiving unit is configured to receive a release access bearer request message sent by the mobility management entity, where the release access bearer request message includes a stop indication.

The determining unit is configured to determine not to send the downlink data notification message according to the value of the status bit determined by the stop indication received by the receiving unit.

Optionally, the device 600 is a serving gateway. And the above and other operations and/or functions of the various modules of the apparatus 600 are respectively omitted for the purpose of implementing the respective processes in the respective methods 200, 300, and 400 of FIGS. 2 through 4, and are not described herein.

The apparatus for data transmission in the circuit domain fallback according to the embodiment of the present invention can prevent the serving gateway from moving to the mobility during the terminal device fallback to the circuit switched network by sending a release access bearer request message including the stop indication to the serving gateway. The management entity sends downlink data triggered by the packet switched service. The notification message is sent, and the MME is unable to page the UE because the UE has left the LTE, so that the MME is overloaded, so that the load of the mobility management entity can be reduced and the system overhead can be reduced.

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

A person skilled in the art can clearly understand that, for the convenience and the cleaning of the description, the specific working processes of the system, the device and the unit described above can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection. The components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or software. The form of the unit is implemented.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, and the foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory ( RAM, Random Access Memory ), a variety of media that can store program code, such as a disk or a disc.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A method for data transmission in a circuit domain fallback, comprising: receiving a resource release request message sent by a base station;

Determining, according to the resource release request message, that the packet switching service suspension operation is not performed; sending, according to the resource release request message, a release access bearer request message to the serving gateway, where the release access bearer request message includes a stop indication, where The stop indication is used to indicate that the serving gateway does not send the downlink data notification message triggered by the packet switched service.

The method according to claim 1, wherein the determining, according to the resource release request message, that the packet switching service suspension operation is not performed, includes:

And determining, according to the circuit domain fallback trigger cause value carried in the resource release request message, that the packet switch service suspension operation is not performed.

The method according to claim 1 or 2, wherein the stop indication is carried in a delayed downlink packet notification request field of the release access bearer request message.

A method for data transmission in a circuit domain fallback, comprising: receiving a release access bearer request message sent by a mobility management entity, where the release access bearer request message includes a stop indication, The stop indication is used to indicate that the downlink data notification message triggered by the packet switched service is not sent to the mobility management entity;

And releasing the bearer resource of the access network according to the release access bearer request message.

The method according to claim 4, after the release of the bearer resource of the access network according to the release of the access bearer request message, the method further includes:

Receiving data of the packet switched service sent by the packet data gateway;

Discarding or caching data of the packet switched service.

The method according to claim 4 or 5, wherein after receiving the release access bearer request message sent by the mobility management entity, the method further includes:

Determining not to transmit the downlink data notification message according to the value of the status bit, the value of the status bit being determined by the stop indication.

A device for data transmission in a circuit domain fallback, comprising: a receiving module, configured to receive a resource release request message sent by a base station;

a determining module, configured to determine, according to the resource release request message received by the receiving module, that the packet switching service suspension operation is not performed;

a sending module, configured to send a release access bearer request message to the serving gateway according to the resource release request message received by the receiving module, where the release access bearer request message includes a stop indication, where the stop indication is used to indicate the service The gateway does not send the downlink data notification message triggered by the packet switching service.

8. Apparatus according to claim 7 wherein:

The determining module is further configured to determine, according to the circuit domain fallback trigger cause value carried in the resource release request message, that the packet switching service suspension operation is not performed.

9. Apparatus according to claim 7 or claim 8 wherein said apparatus is a mobility management entity.

An apparatus for data transmission in a circuit domain fallback, comprising: a receiving module, configured to receive a release access bearer request message sent by a mobility management entity, where the release access bearer request message includes Stopping the indication, the stopping indication is used to indicate that the downlink data notification message triggered by the packet switching service is not sent to the mobility management entity;

And a release module, configured to release the bearer resource of the access network according to the release access bearer request message received by the receiving module.

11. Apparatus according to claim 10 wherein:

The receiving module is further configured to receive data of the packet switched service sent by the packet data gateway; the device further includes:

And a processing module, configured to discard or cache data received by the receiving module.

The device according to claim 10 or 11, wherein the receiving module comprises a receiving unit and a determining unit,

The receiving unit is configured to receive the release access bearer sent by the mobility management entity, And requesting, the releasing the access bearer request message includes a stop indication;

13. Apparatus according to claim 10 or claim 11 wherein said apparatus is a service gateway.