CN103053200B - Close and the method and apparatus of session between access terminal - Google Patents

Abstract

Embodiments of the present invention provide a method and device for closing a session with an access terminal. The method includes: during the handover process of the access terminal from the source access network to the target access network, generating Personality information on the source access network side according to the session information corresponding to the access terminal stored in the source access network; the Personality information includes The Personality type of each set of Personalities in the session information and the validity judgment identifiers corresponding to each set of Personalities; sending a session transfer request including the Personality information to the target access network. The embodiment of the present invention avoids the phenomenon of misjudgment when the target AN judges whether to close the session during the inter-AN handover process.

Description

Method and apparatus for closing a session with an access terminal

technical field

Embodiments of the present invention relate to communication technologies, and in particular to a method and device for closing a session with an access terminal.

Background technique

When switching between different versions of the Access Network (AN for short) of the CDMA 2000 EV-DO (Evolution Data Only, only for mobile data) system, the information saved by the source AN and the Access Terminal (AT for short) ) corresponding session information includes multiple sets of Personality (personality), a set of Personality is a set of negotiated complete protocol subtypes, application layer subtypes, attribute values and public data, through which the target AN can communicate with AT. Through negotiation, AT and AN agree to use attributes and parameter values. These attributes and parameters are divided into multiple sets of personalities for storage. Each set of personalities corresponds to a type of business. Different service types are applied on different networks and carrier frequencies.

If one or more personalities in the session established by the source AN are not the personality type (personality type) supported by the target AN, then the target AN can establish a session with the AT by closing the session and re-negotiating through the initial configuration , so that all personality targets AN are supported. If the content saved by one or more sets of Personality cannot guarantee the session consistency with the AT in the session transferred from the source AN, the target AN can close the session and re-establish the session with the AT through the initial negotiation. Make sure that the content saved by all Personality in the session is consistent with the AT session. If the target AN can support a higher service type than all personality types transferred from the source AN for the AT, the target AN can close the session and re-establish the session with the AT through the initial negotiation, so that the AT Better functions and performance can be used in the target AN network.

The scenario of one-way hard handover in the active state between ANs is as follows: AT establishes a session with the source AN, establishes a connection and enters the active state. The source AN sends an A16-Session Transfer Request message to the target AN, requesting to transfer the stored session information corresponding to the AT. If the version of the target AN is lower than the version of the source AN, the session information transmitted by the source AN contains personality that the target AN does not support. Since the target AN cannot use the unsupported configuration negotiation attributes and parameters, it may even fail to save or be modified, which will cause The session between AT and AN may be inconsistent, so the target AN needs to close the session with AT, and rebuild the session with AT to establish the personality fully supported by the target AN; if the version of the target AN is higher than that of the source AN, the A higher version of personality may be supported for the same terminal, so the session needs to be closed for session reconstruction. After the AT finishes uploading, downloading or other services in the target AN, the target AN closes the session with the AT through the Session Close message, and re-establishes a session fully supported by the target AN through preliminary configuration negotiation.

However, although the existing technology records that the target AN can maintain the consistency of the session with the AT by closing the session, it does not provide a perfect method for the target AN to determine whether to close the session, and does not provide a method for the target AN to determine whether to close the session. information on which to base. Therefore, no matter in the active unidirectional hard handover scenario between ANs, in the active ping-pong hard handover scenario between ANs, or in the continuous active hard handover scenario between multiple ANs, the target AN will always determine whether to close the session Misjudgment may occur.

Contents of the invention

Embodiments of the present invention provide a method and device for closing a session with an access terminal, which is used to solve the defect that a target AN may make a wrong judgment when judging whether to close a session during an inter-AN handover process, resulting in abnormal business.

An embodiment of the present invention provides a method for closing a session with an access terminal, including:

During the handover process of the access terminal from the source access network to the target access network, the source access network generates, according to the session information corresponding to the access terminal stored by the source access network, the Personality information; the Personality information includes the Personality type of each set of Personality in the session information and the validity judgment identifier corresponding to each set of Personality;

The source access network sends a session transfer request including the Personality information to the target access network, so that the target access network judges according to the Personality information whether to close the The session of the access terminal, when it is determined to close the session with the access terminal, after the access terminal completes the service, send a session close message to the access terminal.

An embodiment of the present invention provides another method for closing a session with an access terminal, including:

The target access network receives the session transfer request including Personality information sent by the source access network; the Personality information includes the Personality type and each set of Personality in the session information corresponding to the access terminal saved by the source access network. Set of validity judgment marks corresponding to Personality respectively;

The target access network judges whether to close the session with the access terminal according to the Personality information;

When the target access network determines to close the session with the access terminal according to the Personality information, it sends a session close message to the access terminal after the access terminal completes the service.

An embodiment of the present invention provides a source access network device, including:

A generating module, configured to generate the Personality on the source access network side according to the session information corresponding to the access terminal stored in the source access network during the handover process of the access terminal from the source access network to the target access network information; the Personality information includes the Personality type of each set of Personality in the session information and the validity judgment identifier corresponding to each set of Personality;

A session transfer request sending module, configured for the source access network to send a session transfer request including the Personality information to the target access network, so that the target Whether to close the session with the access terminal after the terminal completes the service.

An embodiment of the present invention provides a target access network device, including: a session transfer request receiving module, configured to receive a session transfer request including Personality information sent by a source access network; the Personality information includes the source access network The Personality type of each set of Personality in the saved session information corresponding to the access terminal and the validity judgment identifier corresponding to each set of Personality;

A session closure judging module, configured to judge whether to close the session with the access terminal according to the Personality information;

A session closing message sending module, configured to send a session closing message to the access terminal after the access terminal completes the service when the target access network determines to close the session with the access terminal according to the Personality information.

In the method and device for closing a session with an access terminal in an embodiment of the present invention, the session transfer request sent by the source AN to the target AN includes the Personality type and each A set of validity judgment marks for Personality. Therefore, the target AN can determine whether to close the session with the AT according to the Personality information in the session transfer request. The embodiment of the present invention avoids the phenomenon of misjudgment when the target AN judges whether to close the session during the inter-AN handover process.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a flowchart of a method for closing a session with an access terminal provided by an embodiment of the present invention;

FIG. 2 is a flow chart of another method for closing a session with an access terminal provided by an embodiment of the present invention;

Fig. 3 is a kind of flowchart of step 22 among Fig. 2;

FIG. 4 is a flow chart of another method for closing a session with an access terminal provided by an embodiment of the present invention;

FIG. 5 is a flowchart of another method for closing a session with an access terminal provided by an embodiment of the present invention;

FIG. 6 is a flowchart of a method for switching between access networks according to an embodiment of the present invention;

FIG. 7A is a schematic structural diagram of a source access network device provided by an embodiment of the present invention;

FIG. 7B is a schematic structural diagram of another source access network device provided by an embodiment of the present invention;

FIG. 8A is a schematic structural diagram of a target access network device provided by an embodiment of the present invention;

FIG. 8B is a schematic structural diagram of another target access network device provided by an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Although the existing technology records that the target AN can maintain the consistency of the session with the AT by closing the session, it does not provide a perfect method for the target AN to determine whether to close the session, and does not provide the means for the target AN to determine whether to close the session. information on which to base. No matter in the scenario of active one-way hard handover between ANs, active ping-pong hard handover between ANs, or continuous active hard handover between multiple ANs, the target AN may generate an error when judging whether to close the session Misjudgment. For example, if the target AN misjudges that the session is closed when there is no need to close the session, initiating session re-establishment will affect the activation delay and occupy bandwidth. For another example, when the session needs to be closed, the target AN misjudges that it does not close the session. If the session between the target AN and the AT is inconsistent, it will cause service abnormalities and affect service performance and even functions. For another example, the session between the target AN and the AT is consistent, and the target AN does not initiate session re-establishment. If the target AN can use a higher service type for the AT, the service type delivered by the source AN is still lower because the target AN does not initiate session re-establishment. session information, it will result in users unable to experience better performance or functions.

The embodiments of the present invention aim at various scenarios of active state hard handover between ANs. When the target AN judges whether to close the session, due to insufficient information, it may cause misjudgment. The session transfer request sent by the source AN to the target AN Added Personality information for the target AN to judge whether to close the session.

Fig. 1 is a flowchart of a method for closing a session with an access terminal provided by an embodiment of the present invention. The following mainly describes the embodiment of the present invention from the perspective of the source AN that initiates the AN handover. It should be noted that, in any inter-AN hard handover scenario, the AN that initiates an inter-AN hard handover to another AN must perform the following steps before sending a session transfer request. As shown in Figure 1, this embodiment includes:

Step 11: During the handover process of the access terminal from the source AN to the target access network, generate Personality information (personality information) on the source AN side according to the session information corresponding to the access terminal saved by the source AN.

The session information corresponding to the AT saved by the source AN may be the session information established after negotiation between the source AN and the AT (at this time, the source AN is the AN that initiates the AN handover in the unidirectional handover scenario, that is, the AT initially accesses the ), or the session information migrated to the source AN after other AN negotiates with the AT (at this time, the source AN is an intermediate AN in the ping-pong handover scenario, that is, the AT initially accesses in other AN).

The specific method for the source AN to generate Personality information can be as follows:

The source AN first determines the Personality type of each set of Personality in the session information corresponding to the AT stored by the source AN. Among them, the Personality type includes: EV-DO Rel 0 (Evolution, Data Only Release 0) business type, EV-DO Rev.A (Evolution, Data Only Revision A) business type and EV-DOR Rev.B (Evolution, Data Only Revision B )business type. The EV-DO Rel 0 service type is lower than the EV-DOR Rev.A service type, and the EV-DO Rev.A service type is lower than the EV-DO Rev.B service type. The Personality type of each set of Personality can be confirmed by combining the protocol subtype in the session information corresponding to the AT saved by the source AN. For example, if the physical protocol subtype is 0, it means that the personality service type of this set is EV-DO Rel0, and the physical protocol subtype If the type is 2, it means that the personality service type of this set is EV-DO Rev.A, and if the physical protocol subtype is 3, it means that the personality service type of this set is EV-DO Rev.A.

The Personality in the session information corresponding to the AT saved by the AN may be lost or modified, resulting in invalidity of this set of Personality. Therefore, when the source AN generates the Personality information, it also needs to judge the validity of each set of Personality in the session information corresponding to the AT and generate a validity judgment identifier. The validity judgment flags corresponding to each set of Personality are used to identify whether the set of Personality is invalid or valid.

During the process of storing and sending the session information corresponding to the AT, the source AN can judge the validity of each set of Personalities in the session information through the transmission integrity, and generate a validity judgment identifier of each set of Personalities. The definition of transmission integrity is as follows: for the successful negotiation, the protocol subtype, attribute and parameter value of the non-protocol default value are all supported to be encoded in the session transfer message and sent to the target AN. The protocol subtypes, attributes and parameter values of non-protocol default values that are successfully negotiated here include the protocol subtypes, attributes and parameter values of non-protocol default values negotiated between the source AN and the terminal, and are also included in other ANs. The protocol subtype, attribute and parameter value of the non-protocol default value transferred to the source AN after successful negotiation. When a set of Personality in the session information is sent incompletely, it is determined that the set of Personality is invalid, and a validity judgment flag indicating that the set of Personality is invalid is generated; when a set of Personality in the session information is sent completely, it is determined that the set of Personality is valid , and generate a validity judgment flag that identifies the validity of the set of Personality.

In the process of saving and sending the session information corresponding to the AT, the source AN can also judge the validity of each set of Personalities in the session information by saving integrity and sending integrity, and generate a validity judgment identifier for each set of Personalities. When a set of Personality in the session information is incompletely saved or sent incompletely, it is determined that the set of Personality is invalid, and a validity judgment flag indicating that the set of Personality is invalid is generated; a set of Personality in the session information is completely saved and sent completely When , it is determined that the set of Personality is valid, and an effectiveness judgment flag indicating that the set of Personality is valid is generated. Preserving integrity refers to saving the attributes, parameters, and protocol subtypes that are successfully negotiated and non-protocol default values. Sending integrity refers to the support of source AN in the session transfer message when switching from the source AN to other ANs. Encode the protocol subtype, attributes, and parameters of the set of personality stored in the source AN session into the SSI information.

For the AT's initial access to the source AN, the source AN and the AT negotiated to establish session information, if the source AN can successfully save the protocol subtype of the non-protocol default value of a certain set of personality in the session information successfully negotiated with the AT, attributes and parameter values, and when the source AN switches to the target AN, the protocol subtype, attributes and parameter values of the set of Personality saved by the source AN can be completely sent in the session migration message, then the set of Personality is valid, The source AN generates a validity judgment flag indicating that the set of Personalities is valid; otherwise, the set of Personalities is invalid, and the source AN generates a validity judgment flag that marks that the set of Personalities is invalid.

After other AN negotiates with AT and establishes session information, transfer the session information to the session information of the source AN through inter-AN handover (for example, transfer the session information to the source AN through the A16-Session Transfer Request message or A13-Session TransferRequest message information), if the source AN can successfully save the protocol subtype, attributes and parameter values of a set of personality non-protocol default values in the session information successfully negotiated between other ANs and ATs, and when the source AN switches to the target AN, the source AN If the protocol subtypes, attributes and parameter values of the set of Personality stored by the AN can be completely sent in the session transfer message, then the set of Personality is valid, and the source AN generates a valid validity judgment flag to identify the set of Personality; otherwise , the set of Personality is invalid, and the source AN generates a validity judgment flag indicating that the set of Personality is invalid.

The session transfer request sent by the source AN to the target AN includes the above-mentioned saved session information. The sending here includes the encoding phase and the sending phase. In the encoding phase, if the source AN does not have all the protocol subtypes, Attributes and parameter values are encoded, but only part of the protocol subtypes, attributes, and parameter values of the set of Personality are encoded. The source AN determines that the set of Personality sent to the target AN is incomplete, that is, the set of Personality is not sent completely. Incomplete description of saving a certain set of Personality for the source AN: If there are one or more values in a certain set of personality that are successfully negotiated and not the default value of the protocol, but are not successfully saved by the source AN, then the set of personality saved by the source AN is incomplete.

Step 12: The source AN sends a session transfer request including Personality information to the target AN, so that the target AN judges whether to close the session with the access terminal after the access terminal completes the service according to the Personality information, and when it is determined to close the session with the access terminal During the session, after the access terminal completes the service, a session close message is sent to the access terminal.

The source AN adds the Personality information generated in step 11 to the session transfer request to be sent to the target AN. After receiving the session transfer request sent by the source AN, the target AN determines whether to close the session with the AT according to the added Personality information of the source access network.

A specific implementation manner of adding Personality information in the session transfer request is as follows: the source AN can add Personality information in Session State Information (SSI for short): PersonalityInfo, which indicates the composition of all personality types in the transferred session.

Specifically, the information of each personality: the Personality type of each personality and the validity judgment flag corresponding to each personality can be represented by the following two parameters: PersonalityType and ValidFlag. Among them, PersonalityType indicates the type of this set of personality, 0x0 indicates that the personality type is EV-DO Rel0, 0xA indicates that the personality type is EV-DO Rev.A, 0xB indicates that the personality type is EV-DO Rev.B; ValidFlag indicates whether this set of personality is It is complete and valid, and whether it can be consistent with AT. A ValidFlag of 1 indicates that the personality is valid, that is, the personality saved by the source AN is consistent with the AT; a ValidFlag of 0 indicates that the personality is invalid, and the personality may be modified or have attributes lost, so it cannot be guaranteed to be completely consistent with the AT.

The following parameters can be added in the SSI of the Session Configuration Protocol (SCP) layer in the main personality: ParameterType, Length, and PersonalityNum to describe the number of personalities in the PersonalityInfo, the length of the PersonalityInfo, and other information. Among them, ParameterType is a newly added parameter type, indicating the personality type indicating parameter; the Length value indicates the length of (PersonalityNum×2+1) bytes; PersonalityNum: indicates how many personalities there are.

The above two parameters PersonalityType and ValidFlag appear in a set, indicating a Personality information. Their sets are equal to PersonalityNum. If there are multiple personalities, the PersonalityTypes are listed from low to high, with the PersonalityType of the main personality at the top.

In the method for switching between access networks in the embodiment of the present invention, the source AN adds the Personality type of each set of Personality and the validity of each set of Personality in the session information corresponding to the AT stored at the local end in the session transfer request sent to the target AN. Judgment logo. Therefore, the target AN can judge whether the target AN can maintain the same session with the AT according to the Personality information in the session transfer request, so as to determine whether to close the session with the AT, and avoid the time when the target AN determines whether to close the session during the inter-AN handover process The phenomenon of misjudgment. The embodiment of the present invention has no influence on switching between ANs of the same version, and is applicable to various scenarios such as one-way switching and ping-pong switching between ANs of the same version and between ANs of different versions.

Fig. 2 is a flow chart of another method for closing a session with an access terminal provided by an embodiment of the present invention. The following describes the embodiment of the present invention mainly from the perspective of a target AN that receives a handover request from another AN. It should be noted that, during hard handover between ANs, the AN after receiving the session transfer request sent by another AN needs to perform the following steps.

As shown in Figure 2, this embodiment includes:

Step 21: The target AN receives the session transfer request including the Personality information (personality information) sent by the source AN; the Personality information includes the Personality type (personality type) of each set of Personality (personality) in the session information corresponding to the AT stored by the source AN Validity judgment marks corresponding to each set of Personality.

In order for the target AN to have enough information to decide whether to close the session, the source AN adds Personality information to the session transfer request (A16-Session Transfer Request message) sent to the target AN. The session transfer request also includes session information corresponding to the source AN and the AT stored by the source AN. Wherein, the Personality information includes the Personality type of each set of Personalities in the session information corresponding to the AT stored by the source AN, and also includes validity judgment identifiers corresponding to each set of Personalities.

The validity judgment flag corresponding to the Personality is used to identify whether the set of Personality is invalid or valid. When the set of Personality is invalid, the set of Personality in the session saved by the source AN is inconsistent with AT, that is, the set of Personality in the session transferred from the source AN to the target AN is inconsistent with the AT; otherwise, when the set of Personality is valid, the set of Personality is transferred from the source AN to the target AN The set of Personality in the session information of AN is consistent with that of AT. Therefore, the validity judgment flag corresponding to the Personality is also used to identify whether the set of Personality is consistent with the AT in the session transferred from the source AN to the target AN.

Step 22: The target AN judges whether to close the session with the AT according to the Personality information.

The target AN can determine whether to support the Personality type in the session information transferred from the source AN to the target AN through each Personality type in the Personality information; through the validity judgment flag in the Personality information, the target AN can determine whether the session information transferred from the source AN to the target AN Whether the corresponding Personality is valid.

Step 23: When the target AN determines to close the session with the AT according to the Personality information, it sends a session close message to the AT after the AT completes the service.

After the AT completes the service at the target AN, if the target AN determines to close the session with the access terminal in step 12, it sends a session close message to the AT, and re-establishes a session fully supported by the target AN.

In the method for closing the session between the target access network and the access terminal in the embodiment of the present invention, the session transfer request sent by the source AN to the target AN includes the Personality of each set of Personality in the session information corresponding to the AT saved by the source AN itself The type and validity judgment mark of each set of Personality. The target AN can judge whether the session between the target AN and the AT can be kept consistent according to the Personality information in the session transfer request, so as to determine whether to close the session with the AT. Misjudgment of the target AN due to insufficient information is avoided. Therefore, the embodiment of the present invention solves the defects of insufficient information and imperfect judgment method when the target AN judges whether to close the session during the inter-AN handover process, avoids the occurrence of misjudgment by the target AN, avoids business abnormalities, and Save bandwidth and improve user experience.

The embodiment of the present invention has no influence on switching between ANs of the same version, and is applicable to various scenarios such as one-way switching and ping-pong switching.

FIG. 3 is a flowchart of step 22 in FIG. 1 . The specific judgment process of step 22 in Fig. 2 is as shown in Fig. 3:

Step 31: The target AN judges whether there is a Personality type (personality type) not supported by the target AN in the Personality information (personality information). If there is a Personality type not supported by the target AN, go to step 32; otherwise, go to step 33.

Specifically, the target AN judges whether there is a PersonalityType not supported by the target AN among all the PersonalityTypes in the PersonalityInfo in the SSI.

Step 32: The target AN determines not to close the session with the AT.

The Personality information includes one or more Personality types supported by the source AN. When there is a Personality type not supported by the target AN in the Personality information, that is, one or more Personality types in the Personality information are not supported by the target AN, the target AN determines to close the session with the access terminal.

For example, in the scenario where a high-version AN is switched to a low-version AN, since the version of the target AN is lower than that of the source AN, the target AN does not support one or more PersonalityTypes transferred from the source AN. According to the above judgment process, in step 31, the target AN determines that there is an unsupported PersonalityType in all the PersonalityTypes of the source AN, and in step 32, the target AN determines to close the session with the AT.

Step 33: If there is no Personality type not supported by the target AN, judge whether all validity judgment flags indicate that the corresponding Personality is valid. If there is one or more validity judgment identifiers among all the validity judgment identifiers, which indicate that the corresponding Personality is invalid, go to step 32 , otherwise go to step 34 .

Specifically, if there is no PersonalityType not supported by the target AN, the target AN judges whether the ValidFlag corresponding to each PersonalityType is 1 or not. If one or more ValidFlag values are 0, the target AN determines to close the session with the access terminal.

Further, when the target AN talks to the AT, in order to make the AT use the optimal service provided by the target AN as much as possible, so that the user can experience better performance, this embodiment also includes the following steps:

Step 34: If all validity judgment flags indicate that the corresponding Personality is valid, judge whether the highest Personality type supported by the AT target AN is higher than all Personality types in the Personality information according to the application subtypes supported by the AT.

If the highest Personality type supported by the target AN for this AT is higher than all the Personality types in the Personality information transferred from the source AN, in order to make the target AN use the highest supported Personality type to communicate with the AT, perform step 35: the target AN determines the shutdown and access session of the terminal; otherwise, execute step 32: the target AN determines not to close the session with the access terminal.

When switching from a low-version AN to a high-version AN, the target AN closes the session with the AT for two purposes: one is to reestablish the session with the AN to avoid service exceptions caused by session inconsistency; the other is to It is possible to use the best service provided by the target network. When the highest Personality type supported by the target AN for the AT is higher than all Personality types in the Personality information, if the target AN is not closed, the following problems will occur: the user spends money to purchase a better service, but cannot use it after entering the network; the target network It also costs money to upgrade to a higher version but cannot provide users with better services, resulting in waste.

Specifically, step 34 may be, if the target AN supports all PersonalityTypes and the corresponding ValidFlag is 1, according to the ATSupportedApplicationSubtypes in the SSI, it is judged whether the highest PersonalityType that the target AN can support for the AT is higher than the highest PersonalityType in the PersonalityInfo, that is, it is judged that for the AT Whether the highest PersonalityType supported by the target AN is higher than all PersonalityTypes in PersonalityInfo.

Among them, ATSupportedApplicationSubtypes includes the application subtypes supported by AT. The target AN obtains the business type supported by the AT according to the application subtype supported by the AT, and judges whether the highest PersonalityType that the target AN can support for the AT is higher than all the PersonalityTypes in the PersonalityInfo according to the business type supported by the AT.

When obtaining the service type supported by AT according to the application subtype supported by AT, the following method can be used: if the subtype of packet application flow supported by AT is equal to 0x000D (Multi-link Multi-Flow Packet Application), then determine the highest service type supported by AT The type is the EV-DO Rev.B service type; if the subtype of the packet application flow supported by the AT is less than 0x000D but equal to 0x0005 (Multi-Flow Packet Application), then it is determined that the highest service type supported by the AT is EV-DO Rev.A Service type; if the subtype of the packet application flow supported by the AT is less than 0x0005 and only supports 0x0002 (Default Packet Application), then it is determined that the highest service type supported by the AT is the EV-DORel0 service type.

The highest Personality type that the target AN can support for the AT is related to the support degree of the AT. For example, the highest personality type supported by the target AN is the EV-DO Rev.B business type, but the business type supported by the AT itself is only the EV-DO Rev.A business type, then the highest personality type that the target AN can support for the AT It is EV-DOR Rev.A business type (EV-DO Rev.B business type is higher than EV-DO Rev.A business type). If the business type supported by the AT itself is the EV-DO Rev.B business type, and the highest personality type supported by the target AN is the EV-DO Rev.B business type, then the highest PersonalityType that the target AN can support for the AT is EV -DO Rev.B service type, the target AN establishes a session including EV-DO Rev.B Personality with the AT.

For example, in the scenario where a lower-version AN is switched to a higher-version AN, usually the higher-version AN supports all PersonalityTypes of the lower-version AN, but the higher-version AN as the target AN may support a higher type of Personality. According to the above judgment process, the target AN determines in step 31 to support all PersonalityTypes in PersonalityInfo. But in step 34, according to the AT application subtype, the highest PersonalityType that the target AN can support for this AT is higher than all the PersonalityTypes transferred from the source AN, so in step 35, the target AN determines to close the session with the AT.

In this embodiment, the target AN first judges whether it supports all Personality types in the Personality information. When there is one or more Personality types in the Personality information that the target AN does not support, the target AN cannot maintain the session consistency with the AT, and it is determined to close the session with the AT. session. When all Personality types are supported, the target AN then judges that the validity judgment flag in the Personality information indicates that the corresponding Personality type is valid. If there is one or more validity judgment flags indicating that the corresponding Personality type is invalid, the target AN cannot maintain the session consistency with the AT, so it is determined to close the session with the AT. When each validity judgment flag indicates that the corresponding Personality type is valid, the target AN further judges whether the Personality type that the target AN can support for this AT is higher than all the Personality types in the Personality information transferred by the source AN, if so, in order to improve user Experience, the target AN can negotiate to use a higher service type Personality for the AT. therefore. The target AN needs to close the session with the AT, and establish a session with a higher service type of personality, otherwise the target AN determines that there is no need to close the session with the AT. This embodiment provides information and a perfect judgment method for the target AN to judge whether to close the session, and solves the defect that the target AN may misjudgment when judging whether to close the session when switching between ANs of different versions.

Fig. 4 is a flowchart of another method for closing a session with an access terminal provided by an embodiment of the present invention. This embodiment mainly explains how the AN determines whether to close the session with the AT in the scenario of active ping-pong hard handover between high → low → high ANs after the handover. For the scenario of high→low→high active ping-pong hard handover between two ANs or active continuous hard handover between three ANs, the first AN is the AN that initially initiates the handover, and the second AN is the AN after the first AN handover , the third AN is the AN after the switching of the second AN in the active state. Wherein, the versions of the first AN and the third AN are higher than the second AN (intermediate AN). The first AN and the third AN may be the same AN or different ANs. As shown in Figure 4, this embodiment includes:

Step 41: After the first AN generates the Personality information (personality information) of the first AN according to the session information corresponding to the AT stored by the first AN, it sends a session transfer request carrying the Personality information to the second AN; the session transfer request also includes It includes the session information corresponding to the AT saved by the first AN.

When switching from the first AN to the second AN, the Personality information of the first AN is first generated according to the session information corresponding to the first AN and the AT saved by the first AN. The Personality information of the first AN includes the Personality type of each set of Personalities in the session information corresponding to the first AN and the AT, and the validity judgment identifiers corresponding to each set of Personalities.

Step 42: After saving the session information transferred from the first AN, the second AN determines that there is an unsupported Personality type (personality type) in the Personality information. Wherein, some attributes or parameters of the Personality not supported by the second AN cannot be stored in the session information on the side of the second AN.

After the second AN receives the session transfer request sent by the first AN, because the version of the second AN is lower than that of the first AN, there is an unsupported Personality type in the second AN in the Personality information, and the second AN saves the transfer from the first AN In the session information of the second AN side, some attributes or parameters of the personality not supported by the second AN cannot be saved in the session information on the second AN side. For example, the second AN cannot use the Personality attributes and parameters of the Personality type not supported by the second AN in the session information corresponding to the first AN and the AT. For another example, because the second AN of a lower version cannot recognize the Personality of the first AN, the Personality changes, such as being lost or modified.

After receiving the session transfer request sent by the first AN, the second AN judges whether to close the session according to the method provided in FIG. 3 . Since the version of the second AN is lower than that of the first AN, in step 31, by judging all the Personality types in the Personality information, the second AN can determine that there is a Personality type not supported by the second AN in the session information corresponding to the AT saved by the first AN , and then determine to close the session with the AT. Since the second AN is always in the active state, even if the second AN determines that the session with the AT needs to be closed, it will not send a session close message to the AT, but will initiate a session transfer request to the third AN in the active state.

Step 43: When the second AN remains active and switches to the third AN, the second AN generates the Personality information of the second AN according to the saved session information corresponding to the second AN and the AT. In the Personality information, the validity judgment identifier corresponding to the Personality not supported by the second AN is coded to indicate that the corresponding Personality is invalid.

Because in step 42, when the second AN saves the session information transferred from the first AN, it cannot save some attributes or parameters of the personality that the second AN does not support into the session information on the second AN side, the second AN cannot Keep the set of Personality consistent with AT. When the second AN remains active and switches to the third AN, in order for the third AN to know that the second AN cannot maintain the consistency between the set of personality and the AT, the second AN generates an invalid validity judgment flag for the set of Personality After adding to the Personality information. For example, for a certain set of Personalities that the second AN cannot maintain consistency with the AT, the second AN codes the ValidFlag of the set of Personalities as 0 to indicate that the set of Personalities is invalid.

Step 44: The second AN keeps the active state and sends a session transfer request carrying the Personality information of the second AN to the third AN. The session transfer request also includes session information corresponding to the second AN and the AT stored by the second AN.

Step 45: After the third AN saves the session information transferred from the second AN, determine that all Personality types in the Personality information of the second AN are supported, and determine that there are one or more validity judgment signs indicating that the corresponding Personality type is invalid, and determine Close the session with AT.

After receiving the session transfer request from the second AN, the third AN judges whether to close the session according to the method provided in FIG. 3 . Since the third AN version is higher than the second AN, in step 31, the third AN determines to support all Personality types of the second AN, but in step 33, it is determined that there are one or more validity judgment identifiers in the Personality information to indicate the corresponding Personality types is invalid. Therefore, the third AN cannot maintain the consistency between these personalities and the AT, and the third AN determines to close the session with the AT.

In the scenario of high → low → high active state hard handover between ANs, when the second AN of the lower version remains active and sends a session transfer request to the third AN, the Personality of the second AN is generated according to the session information corresponding to the second AN and the AT information. In the Personality information, the validity judgment flag corresponding to the Personality that the second AN cannot keep consistent with the AT session is encoded as the corresponding Personality being invalid. After the third AN receives the session transfer request sent by the second AN, because there are one or more validity judgment flags in the Personality information of the second AN, indicating that the corresponding Personality type is invalid, the third AN cannot maintain the consistency between these personalities and the AT Therefore, the third AN determines to close the session with the AT, so that after the AT completes the service, the third AN initiates session reestablishment to the AT, so that the session between the third AN and the AT remains consistent.

Fig. 5 is a flowchart of another method for closing a session with an access terminal provided by an embodiment of the present invention. This embodiment mainly describes how the AN determines whether to close the session with the AT in the scenario of active state hard handover between low→high→low ANs after the handover. In this embodiment, the Personality type of each set of Personality and the validity judgment flag corresponding to each set of Personality are respectively represented by the values of the following two parameters: PersonalityType and ValidFlag. Among them, PersonalityType indicates the type of the personality, and ValidFlag is a validity judgment flag, indicating whether the personality is complete and valid. A ValidFlag of 1 indicates that the personality is valid, and a ValidFlag of 0 indicates that the personality is invalid. As shown in Figure 5, this embodiment includes:

Step 51: After the first AN generates the Personality information (personality information) of the first AN according to the session information corresponding to the AT stored by the first AN, it sends a session transfer request carrying the Personality information to the second AN.

The session transfer request also includes session information corresponding to the first AN and the AT. The session transfer request can be carried by A16-Session Transfer Request message. For the active ping-pong switching scenario between low → high → low ANs, the versions of the first AN and the third AN are lower than that of the second AN (middle AN). The first AN and the third AN may be the same AN or different ANs.

Step 52: The second AN saves the session information transferred from the first AN, and determines that all Personality types in the Personality information are supported and all validity judgment flags are 1. That is, the ValidFlag indicates that the corresponding Personality is valid.

The version of the second AN is higher than that of the first AN, and since the higher version AN is backward compatible, the second AN can support all PersonalityTypes of the first AN. For the session information transferred from the lower version of the first AN, the second AN is backward compatible and supports all the attributes and parameters of the Personality, without loss, and each set of personality is complete and valid.

After receiving the session transfer request from the first AN, the second AN judges whether to close the session according to the method provided in FIG. 3 . Since the second AN is always in an active state, even if the second AN determines to close the session, the second AN will not send a session close message to the AT.

Step 53: When the second AN remains active and switches to the third AN, the second AN generates the Personality information of the second AN according to the saved session information corresponding to the second AN and the AT, and all validity judgment signs in the Personality information are is 1.

Since the second AN is backward compatible with the session information transferred from the first AN of the lower version, all the attributes and parameters of Personality will not be lost, and the second AN can keep all the Personality in the session information transferred from the first AN. Consistency with AT. Therefore, when the second AN encodes PersonalityInfo in the A16-Session Transfer Request message, the ValidFlag of each set of personalities is 1.

Step 54: The second AN keeps the active state and sends a session transfer request carrying the Personality information of the second AN to the third AN. The session transfer request may be carried by the A16-Session Transfer Request message; the A16-Session Transfer Request message also includes the session information corresponding to the second AN and the AT stored by the second AN.

Step 55: After the third AN determines that all Personality types (personality types) in the Personality information are supported, all validity judgment flags are 1, and the highest Personality type supported by the third AN for the AT is not higher than all Personality types in the Personality information, Make sure not to close the session with AT.

In the scenario of active ping-pong hard handover between low → high → low ANs, the session information transferred from the first AN to the second AN is not lost or changed on the side of the second AN of the higher version. When the second AN of the higher version remains active and switches to the third AN, all ValidFlags in the PersonalityInfo generated by the second AN based on the session information corresponding to the second AN and the AT are 1. After the third AN receives the session transfer request, it can determine that all the Personalities in the session information transferred from the second AN are valid according to all the ValidFlags in the PersonalityInfo.

FIG. 6 is a flow chart of a method for switching between access networks according to an embodiment of the present invention. This embodiment mainly describes the stage where the target AN determines whether to close the session with the AT during the inter-AN hard handover process. As shown in Figure 6, this embodiment includes:

Step 61: The source AN sends a session transfer request (for example, A16-Session Transfer Request message) including Personality information (PersonalityInfo) to the target AN.

Step 62A: The target AN judges whether to close the session with the AT according to the Personality information (PersonalityInfo).

After the target AN receives the A16-Session Transfer Request message from the source AN, it judges whether to close the session with the AT according to the PersonalityInfo. The specific judgment process is shown in Figure 3.

Step 62B: The target AN sends a session transfer response (for example, A16-Session TransferResponse message) to the source AN.

Step 63: The source AN sends a session transfer completion response (for example, A16-Session TransferComplete message) to the destination AN.

Step 64: The target AN provides services for the AT.

Step 65: The target AN sends a session release indication (for example, A16-Session ReleaseIndication message) to the source AN.

Step 66: The source AN sends a session release response (for example, A16-Session ReleaseIndication ACK message) to the target AN.

Step 67: After the target AN completes the service, close the connection between the target AN and the AT (for example, Connectionbetween AT and Target AN Closes).

Step 68: The target AN sends a resource release request (for example, A13-Resource Release Request message) to the source AN.

Step 69: When the target AN determines to close the session with the AT in step 62A, the target AN sends a session close message (for example, a Session Close message) to the AT.

Step 610: The source AN sends a resource release response (for example, A13-Resource ReleaseResponse message) to the target AN.

After that, the session between the target AN and the AT is established.

In the embodiment of the present invention, after the source AN sends the A16-Session Transfer Request message to the target AN, the target AN decides whether to send a Session Close message to the AT after the AT completes the business according to the PersonalityInfo to maintain session consistency with the AT sex.

FIG. 7A is a schematic structural diagram of a source access network device provided by an embodiment of the present invention. As shown in Figure 7A, the source access network device provided by the embodiment of the invention includes:

A generating module 71, configured to generate the source access network according to the session information corresponding to the access terminal stored in the source access network during the handover process of the access terminal from the source access network to the target access network Personality information on the side; the Personality information includes the Personality type of each set of Personality in the session information and the validity judgment identifier corresponding to each set of Personality; the validity judgment identifier corresponding to each set of Personality is used to identify that the set of Personality is invalid or valid.

A session transfer request sending module 72, configured for the source access network to send a session transfer request including the Personality information generated by the generation module 71 to the target access network, so that the target access network can judge the Whether to close the session with the access terminal after the access terminal completes the service.

Further, as shown in FIG. 7B , the generating module 71 includes: a type determining unit 711 and a validity encoding unit 712 .

A type determining unit 711, configured to determine the Personality type of each set of Personalities in the session information.

The validity coding unit 712 is configured to save integrity and send integrity of each set of Personality according to the session information stored on the source access network and corresponding to the access terminal, or according to the information stored on the source access network and corresponding to the access terminal. Accessing the transmission integrity of each set of Personality in the session information corresponding to the access terminal, judging the validity of each set of Personality in the session information and generating a validity judgment identifier.

Specifically, when judging the validity of each set of Personality in the session information and generating a validity judgment flag according to the preservation integrity and transmission integrity of each set of Personality in the session information: the validity encoding unit 712 is specifically used to When a set of Personality in the session information is incompletely preserved or sent incompletely, it is determined that the set of Personality is invalid, and a validity judgment flag indicating that the set of Personality is invalid is generated; a set of Personality in the session information is preserved intact and sent When complete, determine that the set of Personality is valid, and generate a validity judgment flag that identifies the set of Personality; judge the validity of each set of Personality in the session information by the above method, and generate and identify the set of Personality for each set of Personality Effective validity judgment logo.

Specifically, when judging the validity of each set of Personality in the session information according to the integrity of sending each set of Personality in the session information and generating a validity judgment flag: the validity encoding unit 712 is specifically used to When a set of Personality in the session information is sent incompletely, determine that the set of Personality is invalid, and generate a validity judgment flag that identifies the set of Personality as invalid; when a set of Personality in the session information is sent completely, determine that the set of Personality is valid, and generate A validity judgment mark identifying the validity of the set of Personalities; judging the validity of each set of Personalities in the session information through the above method, and generating a validity judgment mark for each set of Personalities to identify the validity of the set of Personalities.

In the source access network provided by the embodiment of the present invention, the session transfer request sending module 72 adds the Personality type and each set of Personality in the session information corresponding to the AT stored at the local end to the session transfer request sent to the target AN. The validity judgment flag of Personality. The Personality type of each set of Personality in the session transfer request reflects the Personality type used by the source AN in the conversation with the AT. If the target AN does not support these Personality types, the target AN cannot maintain session consistency with the AT. The validity judgment flag of each set of Personality in the session transfer request reflects the validity of each set of Personality saved by the source AN for the AT. If the Personality saved by the source AN is invalid, the target AN cannot maintain the consistency between the set of Personality and the AT .

FIG. 8A is a schematic structural diagram of a target access network device provided by an embodiment of the present invention. As shown in FIG. 8A , the target access network device provided by the embodiment of the invention includes: a session transfer request receiving module 81 , a session closing judging module 82 and a closing message sending module 83 .

The session transfer request receiving module 81 is configured to receive a session transfer request including Personality information sent by the source access network; the Personality information includes each set of Personality in the session information corresponding to the access terminal saved by the source access network The type of Personality and the validity judgment marks corresponding to each set of Personality.

The session closing judging module 82 is configured to judge whether to close the session with the access terminal according to the Personality information received by the session transfer request receiving module 81 .

Specifically, the session closing judging module 82 is specifically configured to: if the target access network supports all Personality types in the Personality information and all validity judgment identifiers in the Personality information indicate that the corresponding Personality is valid, and the target access The highest Personality type supported by the network for the access terminal is not higher than all Personality types in the Personality information, determine not to close the session with the access terminal, otherwise determine to close the session with the access terminal.

The close message sending module 83 is configured to send a session close message to the access terminal after the access terminal completes the service when the session close judging module 82 determines to close the session with the access terminal according to the Personality information.

Further, as shown in FIG. 8B , the session closure judgment module 82 includes: a first support judgment unit 821 , a validity judgment unit 822 , a second support judgment unit 823 and a session closure determination unit 824 .

The first support judging unit 821 is configured to judge whether there is a Personality type not supported by the target access network in the Personality information.

The validity judgment unit 822 is configured to, if the first support judgment unit 821 determines that there is no Personality type not supported by the target access network, judge whether all the validity judgment identifiers in the Personality information indicate that the corresponding Personality is valid.

The second support judging unit 823 is configured to: if the validity judging unit 822 determines that all the validity judging signs indicate that the corresponding Personality is valid, according to the application subtype supported by the access terminal, the target access network judges the Whether the highest Personality type supported by the target access network of the terminal is higher than all Personality types in the Personality information.

The session closure determination unit 824 is configured to determine to close the session with the access terminal if the first support determination unit 821 determines that there is a Personality type not supported by the target access network; if the first support determination unit 821 determines that all valid If there are one or more Personality validity judgment identifiers in the personality judgment identifier, it means that the corresponding Personality is invalid, and it is determined to close the session with the access terminal; if the second support judgment unit 823 determines that the target access network supports the access terminal If the highest Personality type is higher than all Personality types in the Personality information, it is determined to close the session with the access terminal.

For the target access network provided by the embodiment of the present invention, the session closing judging module 82 judges whether the target AN is consistent with the session between the ATs according to the Personality information in the session transfer request, so as to determine whether to close the session with the AT. Misjudgment of the target AN due to insufficient information is avoided. Therefore, the embodiment of the present invention solves the defects of insufficient information and imperfect judgment method when the target AN judges whether to close the session during the inter-AN handover process, avoids the occurrence of misjudgment by the target AN, avoids business abnormalities, and Save bandwidth and improve user experience.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (9)

1. A method for closing a session with an access terminal, comprising: During the handover process of the access terminal from the source access network to the target access network, the source access network generates, according to the session information corresponding to the access terminal stored by the source access network, the Personality information; the Personality information includes the Personality type of each set of Personalities in the session information and the validity judgment identifiers corresponding to each set of Personalities; the validity judgment identifiers corresponding to each set of Personalities are used to identify whether the set of Personalities is invalid or valid ; The source access network sends a session transfer request including the Personality information to the target access network, so that the target access network determines whether to close the session after the access terminal completes the service according to the Personality information For the session with the access terminal, when it is determined to close the session with the access terminal, after the access terminal completes the service, send a session close message to the access terminal; The generating the Personality information on the source access network side according to the session information corresponding to the access terminal stored in the source access network includes: The source access network determines the Personality type of each set of Personality in the session information; The source access network judges that the The validity of each set of Personality in the session information and generate a validity judgment mark; Wherein, the sending integrity of each set of Personality refers to the non-protocol default protocol subtype, attribute and The parameter values all support encoding and sending to the target access network in the session transfer request. 2. The method according to claim 1, wherein, according to the preservation integrity and transmission integrity of each set of Personality in the session information, the validity of each set of Personality in the session information is judged and the validity is generated. Judgment identification, including: When a set of Personality in the session information is incompletely saved or sent incompletely, it is determined that the set of Personality is invalid, and a validity judgment flag indicating that the set of Personality is invalid is generated; When a set of Personality in the session information is preserved and sent completely, it is determined that the set of Personality is valid, and a validity judgment flag identifying that the set of Personality is valid is generated; The validity of each set of Personality in the session information is judged by the above method, and a validity judgment flag is generated for each set of Personality to identify that the set of Personality is valid. 3. The method according to claim 1, wherein the source access network judges the validity of each set of Personality in the session information according to the transmission integrity of each set of Personality in the session information and generates a valid Sexual judgment markers, including: When a set of Personality in the session information is sent incompletely, it is determined that the set of Personality is invalid, and a validity judgment flag indicating that the set of Personality is invalid is generated; When a set of Personality in the session information is sent completely, it is determined that the set of Personality is valid, and a valid validity judgment identifier for identifying the set of Personality is generated; The validity of each set of Personality in the session information is judged by the above method, and a validity judgment flag is generated for each set of Personality to identify that the set of Personality is valid. 4. A method for closing a session with an access terminal, comprising: The target access network receives the session transfer request including Personality information sent by the source access network; the Personality information includes the Personality type and each set of Personality in the session information corresponding to the access terminal saved by the source access network. Set of validity judgment marks corresponding to Personality respectively; The target access network judges whether to close the session with the access terminal according to the Personality information; When the target access network determines to close the session with the access terminal according to the Personality information, after the access terminal completes the service, send a session close message to the access terminal; The target access network judging whether to close the session with the access terminal according to the Personality information includes: If the target access network supports all Personality types in the Personality information and all validity judgment identifiers in the Personality information indicate that the corresponding Personality is valid, and the target access network supports the highest Personality for the access terminal type is not higher than all Personality types in the Personality information, determine not to close the session with the access terminal, otherwise determine to close the session with the access terminal; or, The target access network determining whether to close the session with the access terminal according to the Personality information includes: Judging whether there is a Personality type not supported by the target access network in the Personality information; If there is a Personality type not supported by the target access network, determine to close the session with the access terminal; If there is no Personality type not supported by the target access network, judge whether all the validity judgment signs in the Personality information indicate that the corresponding Personality is valid; If there is one or more Personality validity judgment identifiers in all validity judgment identifiers, indicating that the corresponding Personality is invalid, determine to close the session with the access terminal; If all validity judgment signs indicate that the corresponding Personality is valid, according to the application subtype supported by the access terminal, the target access network judges whether the highest Personality type supported by the target access network for the access terminal is higher than All Personality types in Personality information; If the highest Personality type supported by the target access network for the access terminal is higher than all Personality types in the Personality information, determine to close the session with the access terminal. 5. A source access network device, characterized in that, comprising: A generating module, configured to generate the Personality on the source access network side according to the session information corresponding to the access terminal stored in the source access network during the handover process of the access terminal from the source access network to the target access network Information; the Personality information includes the Personality type of each set of Personality in the session information and the validity judgment marks corresponding to each set of Personality; the validity judgment marks corresponding to each set of Personality are used to identify that the set of Personality is invalid or valid; A session transfer request sending module, configured to send a session transfer request including the Personality information to the target access network, so that the target access network judges whether to close the terminal after the access terminal completes the service according to the Personality information a session with the access terminal; The generating modules include: a type determining unit, configured to determine the Personality type of each set of Personality in the session information; A validity encoding unit, configured to judge each set of Personality in the session information according to the preservation integrity and transmission integrity of each set of Personality in the session information, or according to the transmission integrity of each set of Personality in the session information The validity of the system and generate a validity judgment mark; Wherein, the sending integrity of each set of Personality refers to the non-protocol default protocol subtype, attribute and The parameter values all support encoding and sending to the target access network in the session transfer request. 6. The device according to claim 5, wherein the validity coding unit is specifically configured to determine that the set of Personality is invalid when the set of Personality in the session information is incompletely stored or transmitted, and generate an identifier Validity judgment flag indicating that the set of Personalities is invalid; when a set of Personalities in the session information is completely saved and sent, it is determined that the set of Personalities is valid, and a validity judgment flag identifying that the set of Personalities is valid is generated, and then judged one by one. Describe the validity of each set of Personality in the session information, and generate a validity judgment flag for each set of Personality to identify that the set of Personality is valid. 7. The device according to claim 5, wherein the validity coding unit is specifically configured to determine that the set of Personality is invalid when the transmission of a set of Personality in the session information is incomplete, and generate an ID indicating that the set of Personality is invalid. Validity judgment mark; when a set of Personality in the session information is sent completely, it is determined that the set of Personality is valid, and a valid validity judgment mark for identifying the set of Personality is generated, and then each set of the session information is judged one by one The validity of the Personality, and generate a validity judgment flag for each set of Personality to identify the validity of the set of Personality. 8. A target access network device, characterized in that it comprises: A session transfer request receiving module, configured to receive a session transfer request including Personality information sent by the source access network; the Personality information includes the information of each set of Personality in the session information corresponding to the access terminal stored by the source access network The type of Personality and the validity judgment marks corresponding to each set of Personality; A session closure judging module, configured to judge whether to close the session with the access terminal according to the Personality information; A close message sending module, configured to send a session close message to the access terminal after the access terminal completes the service when determining to close the session with the access terminal according to the Personality information; The session closing judging module is specifically configured to: if the target access network supports all Personality types in the Personality information and all validity judgment identifiers in the Personality information indicate that the corresponding Personality is valid, and the target access network supports the The highest Personality type supported by the access terminal is not higher than all the Personality types in the Personality information, determine not to close the session with the access terminal, otherwise determine to close the session with the access terminal. 9. The device according to claim 8, wherein the session closure judging module comprises: A first support judging unit, configured to judge whether there is a Personality type not supported by the target access network in the Personality information; A validity judging unit, configured to judge whether all the validity judging signs in the Personality information indicate that the corresponding Personality is valid if there is no Personality type not supported by the target access network; The second support judgment unit is configured to judge the target access network for the access terminal according to the application subtype supported by the access terminal if all validity judgment identifiers indicate that the corresponding Personality is valid Whether the highest supported Personality type is higher than all Personality types in the Personality information; A session closure determining unit, configured to determine to close the session with the access terminal if there is a Personality type not supported by the target access network; if there are one or more Personality validity judgment identifiers in all validity judgment identifiers If the corresponding Personality is invalid, determine to close the session with the access terminal; if the highest Personality type supported by the target access network for the access terminal is higher than all Personality types in the Personality information, determine to close the session with the access terminal .