WO2012159378A1 - 关闭与接入终端间会话的方法和设备 - Google Patents

关闭与接入终端间会话的方法和设备 Download PDF

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Publication number
WO2012159378A1
WO2012159378A1 PCT/CN2011/078378 CN2011078378W WO2012159378A1 WO 2012159378 A1 WO2012159378 A1 WO 2012159378A1 CN 2011078378 W CN2011078378 W CN 2011078378W WO 2012159378 A1 WO2012159378 A1 WO 2012159378A1
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WO
WIPO (PCT)
Prior art keywords
personality
session
information
access network
access terminal
Prior art date
Application number
PCT/CN2011/078378
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English (en)
French (fr)
Inventor
卢春梅
林常志
陈兴
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180001782.5A priority Critical patent/CN103053200B/zh
Priority to PCT/CN2011/078378 priority patent/WO2012159378A1/zh
Publication of WO2012159378A1 publication Critical patent/WO2012159378A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/143—Termination or inactivation of sessions, e.g. event-controlled end of session
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the 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
  • the source terminal saves the access terminal (Access Terminal, referred to as AT).
  • the corresponding session information includes multiple sets of Personality.
  • a set of Personality is a set of negotiated complete protocol subtypes, application layer subtypes, attribute values, and public data.
  • the Personality target AN can communicate with the AT.
  • the AT and the AN negotiate to use the attributes and the values of the parameters.
  • These attributes and parameters are divided into multiple sets of personality. Each set of personality corresponds to a type of business. Each set of personality has different performance and functional capabilities. Different types of services are applied to the network and carrier frequency.
  • the target AN can establish a session with the AT by closing the session and re-establishing the initial configuration negotiation. , so that all personality goals are supported by AN. If the content saved by one or more sets of Personality cannot guarantee the session consistency with the AT in the session transferred by the source AN, the target AN can establish a session with the AT by closing the session and re-initial negotiation. Make the content saved by all Personality in the session ensure the session consistency with the AT.
  • the target AN can support a higher service type than all the personality types transferred from the source AN for the AT, the target AN can establish a session with the AT by closing the session and re-initial negotiation, thereby allowing the AT to Better features and performance can be used in the target AN network.
  • the active state unidirectional hard handover scenario between ANs is as follows: AT establishes a session with the source AN, establishes a connection into Into the active state.
  • the source AN sends an Al 6-Session Transfer Request message to the target AN, requesting delivery of the saved session information corresponding to the AT. If the target AN version is lower than the source AN version, the session information delivered by the source AN contains the personality that is not supported by the target AN.
  • the configuration negotiation attributes and parameters that are not supported by the target AN cannot be used, and may even be saved or modified.
  • the AT and AN sessions may be inconsistent, so the target AN needs to close the session with the AT, reestablish the session with the AT to establish the personality fully supported by the target AN; if the target AN version is higher than the source AN, then the target is measured AN A higher version of personality may be supported for the same type of terminal, so it is also necessary to close the session for session re-establishment.
  • the target AN closes the session with the AT through the Session Close message, and re-establishes the session fully supported by the target AN through the initial configuration negotiation.
  • the target AN can maintain the consistency with the session between the ATs by closing the session, but does not provide a perfect method for the target AN to determine whether to close the session, and does not provide the target AN to determine whether to close the session.
  • the embodiments of the present invention provide a method and a device for shutting down a session with an access terminal, which are used to solve the defect that the target AN may determine that the service is abnormal due to misjudgment when the session is closed during the inter-AN handover process.
  • the embodiment of the invention provides a method for closing a session with an access terminal, which includes:
  • the source access network During the process of the access terminal switching from the source access network to the target access network, the source access network generates the source access network side according to the session information corresponding to the access terminal saved by the source access network.
  • Personality information includes each set of the session information
  • 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, according to the personality information, whether to close the device after the access terminal completes the service.
  • the session of the access terminal when it is determined that the session with the access terminal is closed, after the access terminal completes the service, sends a session close message to the access terminal.
  • the embodiment of the present invention provides another method for closing a session with an access terminal, including: the target access network receiving a session transfer request that includes the personality information sent by the source access network; the personality information including the source access a validity judgment identifier corresponding to each set of personality personality type and each set of personality in the session information corresponding to the access terminal stored in the network;
  • the target access network determines, according to the Personality information, whether to close the session with the access terminal;
  • the target access network determines to close the session with the access terminal according to the Personality information
  • the session access message is sent to the access terminal.
  • An embodiment of the present invention provides a source access network device, including:
  • a generating module configured to generate, according to the session information corresponding to the access terminal saved by the source access network, a personality of the source access network side during the process of the access terminal switching from the source access network to the target access network
  • the personality information includes a personality type of each set of personality in the session information and a validity judgment identifier corresponding to each set of personality respectively
  • a session transfer request sending module configured to send the source access network to the target access network And a session transfer request including the personality information, so that the target access network determines, according to the personality information, whether to close a session with the access terminal after the access 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 that includes a personality information sent by a source access network; the personality information includes the source access network The validity judgment of the Personality type and each Personality of each set of Personality in the saved session information corresponding to the access terminal Identification
  • a session closure determining module configured to determine, according to the Personality information, whether to close a session with the access terminal
  • the session close message sending module is configured to: 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 source AN sends a session transfer request to the target AN, and includes the personality type and each of each set of personality in the session information corresponding to the AT saved by the local end. Set the validity judgment identifier of Personality. Therefore, the target AN can determine whether to close the session with the AT based on the Personality information in the session transfer request.
  • the embodiment of the invention avoids the phenomenon that the target AN determines whether the misjudgment occurs when the session is closed during the inter-AN handover process.
  • FIG. 1 is a flowchart of a method for closing a session with an access terminal according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another method for closing a session between an access terminal and an access terminal according to an embodiment of the present invention
  • FIG. 3 is a flow chart of step 22 in Figure 2;
  • FIG. 4 is a flow chart of still another method for closing a session with an access terminal according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of still another method for closing a session with an access terminal according to 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 according to an embodiment of the present invention
  • FIG. 7B is a schematic structural diagram of another source access network device according to an embodiment of the present invention
  • FIG. 8B is a schematic structural diagram of another target access network device according to an embodiment of the present invention.
  • the target AN can maintain the consistency with the inter-AT session by closing the session, but does not provide a perfect method for the target AN to determine whether to close the session, and also does not provide the target AN to determine whether to close the session. Based on the information. Regardless of the active state unidirectional hard handover scenario between ANs, or the active ping-pong hard handover between ANs, or the scenario of maintaining active state hard handover continuously between multiple ANs, the target AN may generate a judgment when determining whether to close the session. Misjudgment. For example, when the target AN is not required to close the session when the session is closed, the session reestablishment will affect the activation delay and occupy bandwidth.
  • the target AN when the session needs to be closed, the target AN is erroneously determined not to close the session. If the session between the target AN and the AT is inconsistent, the service is abnormal, affects service performance, and even functions. For another example, the target AN is consistent with the session of the AT, and the target AN does not initiate session reestablishment. If the target AN can use a higher service type for the AT, the service type transmitted by the source AN is lower because the target AN does not initiate the session reestablishment. Session information can result in users not being able to experience better performance or functionality.
  • the target AN determines whether it is necessary to close the session, and the defect is likely to occur due to insufficient information.
  • Personality information is added to the session transfer request sent by the target AN for the target AN to determine whether the session needs to be closed.
  • FIG. 1 is a flowchart of a method for closing a session with an access terminal according to an embodiment of the present invention.
  • the following describes the embodiment of the present invention mainly from the perspective of the source AN that initiates the AN handover. It should be noted that in the scenario of hard handover between any AN, an AN that initiates an inter-AN hard handover to another AN performs the following steps before sending a session transfer request. As shown in FIG. 1, this embodiment includes:
  • Step 11 During the handover process from the source AN to the target access network, the access terminal generates Personality information (personality information) on the source AN side according to the session information corresponding to the access terminal saved by the source AN.
  • Personality information personality information
  • the session information corresponding to the AT saved by the source AN may be the session information established after the source AN negotiates with the AT.
  • the source AN is the AN that initiates the AN handover in the unidirectional handover scenario, that is, the AT initially accesses the source AN.
  • the source AN may also be session information that other ANs negotiate with the AT to migrate to the source AN (in this case, the source AN is an intermediate AN in the ping-pong handover scenario, that is, the AT initially accesses the other AN) vigorous
  • the source AN generates the Personality information.
  • the specific method 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 held by the source AN.
  • Personality types include: EV-DO Rel 0 ( Evolution, Data Only Release 0 ) Service Type, EV-DO Rev. A ( Evolution, Data Only Revision A ) Service Type and EV-DO Rev.B ( Evolution, Data Only Revision B) Business type.
  • the EV-DO Rel 0 service type is lower than the EV-DO 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 may be confirmed by the protocol subtype in the session information corresponding to the AT saved by the source AN.
  • the personality service type is EV-DO RelO
  • the physical protocol is used.
  • a type of 2 indicates that the personality service type is EV-DO Rev.A
  • a physical protocol subtype of 3 indicates that the personality service type is EV-DO Rev.A.
  • the AN saves that the Personality in the session information corresponding to the AT may be lost or modified, thereby causing the set of Personality to be invalid. Therefore, when the source AN generates the Personality information, it still needs to be judged.
  • the validity of each set of personality in the session information corresponding to the AT is broken and a validity judgment identifier is generated.
  • the validity judgment identifier corresponding to each set of Personality is used to identify that the set of Personality is invalid or valid.
  • the source AN may determine the validity of each set of Personality in the session information by sending integrity, and generate a validity judgment identifier of each set of Personality.
  • the transmission integrity is defined as follows: For successful negotiation, the protocol subtype, attribute and parameter values of the non-protocol default value are supported in the session transfer message and sent to the target AN.
  • the negotiated successful, non-protocol default value of the protocol subtype, attribute and parameter value includes the protocol subtype, attribute and parameter value of the non-protocol default value negotiated by the source AN and the terminal, and is also included in other ANs.
  • the protocol subtype, attribute, and parameter values that are transferred to the source AN's non-protocol defaults after successful negotiation.
  • a set of Personality is incomplete in the session information, it is determined that the set of Personality is invalid, and a validity judgment identifier that identifies that the set of Personality is invalid is generated; when a set of Personality in the session information is completely sent, it is determined that the set of Personality is valid. And generate a validity judgment identifier that identifies the set of Personality.
  • the source AN may also determine the validity of each set of Personality in the session information by storing integrity and transmission integrity, and generate validity judgment identifiers of each set of Personality.
  • a set of Personality is incomplete or incompletely sent in the session information, it is determined that the set of Personality is invalid, and a validity judgment identifier indicating that the set of Personality is invalid is generated; a set of Personality in the session information is completely saved and sent completely.
  • a validity judgment identifier that identifies the set of Personality.
  • the integrity of the negotiation means that the attributes, parameters, and protocol subtypes of the non-protocol default value are saved, and the integrity is sent.
  • the source AN When the source AN is switched to another AN, the source AN supports the session transfer message.
  • the protocol subtypes, attributes, and parameters of the set of personalities stored in the source AN session are encoded into the SSI information.
  • the source AN and the AT negotiate the session information, if the source AN can successfully save a certain set of personality in the session information successfully negotiated with the AT.
  • the protocol subtype, the attribute, and the parameter value of the default value of the protocol and when the source AN is switched to the target AN, the protocol subtype, attribute, and parameter value of the set of Personality saved by the source AN can be completely sent in the session migration message.
  • the set of Personality is valid, and the source AN generates a validity judgment identifier that identifies the set of Personality; otherwise, the set of Personality is invalid, and the source AN generates a validity judgment identifier that identifies that the set of Personality is invalid.
  • the session information is transmitted to the source AN through the inter-AN handover (for example, the A16-Session Transfer Request message or the A13-Session Transfer Request message is migrated to the source AN.
  • Session information if the source AN can successfully save the protocol subtype, attribute and parameter value of a set of personality non-protocol default values in the session information negotiated by the other AN and the AT, and the source AN switches to the target AN, If the protocol subtype, the attribute, and the parameter value of the set of Personality saved by the source AN can be completely sent in the session transfer message, the set of Personality is valid, and the source AN generates a validity judgment identifier that identifies the set of Personality. Otherwise, the set of Personality is invalid, and the source AN generates a validity judgment identifier that identifies that the set of Personality is invalid.
  • the source AN sends a session transfer request to the target AN, including the saved session information, where the sending includes an encoding phase and a sending phase. If the source AN does not have all the protocol subtypes of a complete set of Personality in the encoding phase, The attribute and the parameter value are encoded, and only part of the protocol subtype, attribute and parameter value of the Personality are encoded, and the source AN determines that the set of Personality sent to the target AN is incomplete, that is, the set of Personality is incompletely transmitted.
  • a description of the incomplete collection of a set of Personality for the source AN If one or more values of the negotiation succeeded and the non-protocol default value are not successfully saved by the source AN, the set of personality saved by the source AN It is not complete.
  • Step 12 The source AN sends a session transfer request including the personality information to the target AN, so that the target AN determines, according to the personality information, whether to close the session with the access terminal after the access terminal completes the service, and when it is determined to close the access terminal.
  • the target AN adds the Personality information generated in step 11 to the session transfer request to be sent to the target AN.
  • the target AN determines whether to close the session with the AT according to the Personality information of the source access network added therein.
  • the source AN may add Personality information in the Session State Information (SSI): PersonalityInfo, indicating the composition of all personality types in the transferred session.
  • SSI Session State Information
  • the information of each set of personality can be represented by the following two parameters: PersonalityType and ValidFlag.
  • PersonalityType indicates the type of the personality
  • 0x0 indicates that the personality type is EV-DO RelO
  • OxA indicates that the personality type is EV-DO Rev. A
  • OxB indicates that the personality type is EV-DO Rev.B
  • ValidFlag indicates whether the personality is It is complete and effective, and can be consistent with AT.
  • ValidFlag of 1 means that the set of personality is valid, that is, the personality saved by the source AN is consistent with the AT;
  • ValidFlag of 0 means that the set of personality is invalid, the set of personality may be modified or the attribute is lost, and it is not guaranteed to be completely consistent with AT.
  • ParameterType is a new parameter type, indicating personality type indication parameter; Length value indicates (PersonalityNum x 2+1) bytes length; PersonalityNum: indicates how many personality.
  • PersonalityType and ValidFlag appear in a set, indicating a Personality information. Their number of sets is equal to PersonalityNum. If there are multiple personalities, the PersonalityType's 4 non- ⁇ 1 1 order is from [ ⁇ to high, the main personality of the PersonalityType is the first.
  • an inter-network handover method is used, and the source AN is sent to the session of the target AN.
  • the personality type of each set of Personality and the validity judgment identifier of each set of Personality in the session information corresponding to the AT stored in the local end are added. Therefore, the target AN can determine whether the target AN can be consistent with the session between the ATs according to the Personality information in the session transfer request, thereby determining whether to close the session with the AT, and avoiding the target AN determining whether to close the session during the inter-AN handover process.
  • the embodiment of the present invention has no effect on the switching between the same version of the AN, and is applicable to various scenarios such as the same version AN, different versions of the AN, one-way switching, and ping-pong switching.
  • FIG. 2 is a flow chart of another method for closing a session with an access terminal according to an embodiment of the present invention.
  • the following describes an embodiment of the present invention mainly from the perspective of the target AN of receiving a handover request from another AN. It should be noted that, in the case of hard handover between ANs, the following steps are required to receive the AN after the session transfer request sent by another AN.
  • this embodiment includes:
  • Step 21 The target AN receives a session transfer request that includes the Personality information (personality information) sent by the source AN.
  • the Personality information includes the Personality type (personality type) of each set of Personality in the session information corresponding to the AT saved by the source AN.
  • the validity judgment identifier corresponding to each set of Personality.
  • 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 the session information corresponding to the source AN and the AT saved by the source AN.
  • the Personality information includes the Personality type of each Personality in the session information corresponding to the AT saved by the source AN, and the validity judgment identifier corresponding to each set of Personality.
  • a validity judgment identifier corresponding to the personality which is used to identify that the set of Personality is invalid or valid.
  • the set of Personality in the session saved by the source AN is inconsistent with the AT, that is, the set of Personality is inconsistent with the AT in the session in which the source AN is transferred to the target AN; otherwise, when the set of Personality is valid, the source AN is transferred to the target.
  • the set of session information in AN Personality is consistent with AT. Therefore, the validity judgment identifier corresponding to the personality is also used to identify whether the set of personality in the session that the source AN transfers to the target AN is consistent with the AT.
  • Step 22 The target AN determines whether to close the session with the AT based on the Personality information.
  • the target AN can determine whether the source AN is transferred to the personality type in the session information of the target AN by using the Personality type in the Personality information.
  • the target AN can determine that the source AN is transferred to the session information of the target AN by using the validity judgment identifier in the Personality information. Whether the corresponding Personality is valid.
  • Step 23 The target AN determines to close the session with the AT according to the Personality information, and sends a session close message to the AT after the AT completes the service.
  • the AT After the AT completes the service, if the target AN determines to close the session with the access terminal in step 12, the AT sends a session close message to the AT to re-establish the session fully supported by the target AN.
  • the target access network closes the session with the access terminal
  • the source AN includes the personality of each set of personality in the session information corresponding to the AT saved by the active AN at the session transfer request sent by the source AN.
  • the target AN can determine whether the target AN can be consistent with the session between the ATs according to the Personality information in the session transfer request, thereby determining whether to close the session with the AT. Avoided the misjudgment of the target AN due to insufficient information.
  • the embodiment of the present invention solves the defect that the target AN determines that the information is insufficient and the judgment method is not perfect when the session is closed during the inter-AN handover process, and avoids the occurrence of the target AN misjudgment phenomenon, and can avoid the service abnormality. Save bandwidth and improve user experience.
  • the embodiment of the invention has no effect on the switching between the same version of the AN, and is applicable to various scenarios such as one-way switching and ping-pong switching.
  • FIG. 3 is a flow chart of step 22 of Figure 1. The specific judgment process of step 22 in Figure 2 is shown in Figure 3:
  • Step 31 The target AN determines whether there is a Personality type (personality type) that is not supported by the target AN in the Personality information (personality information). If there is a Personality that the target AN does not support Type, go to step 32; otherwise, go to step 33.
  • a Personality type personality type
  • personality information personality information
  • the target AN determines whether there is a PersonalityType that is not supported by the target AN in all PersonalityTypes of the PersonalityInfo in the SSI.
  • Step 32 The target AN determines not to close the session with the AT.
  • Personality information includes one or more Personality types supported by the source AN.
  • the target AN determines to close the session with the access terminal.
  • a higher version of AN switches to a lower version of the AN. Since the target AN version is lower than the source AN, the target AN does not support one or more PersonalityTypes transferred from the source AN. According to the above judging process, in step 31, the target AN determines that there is an unsupported PersonalityType in all 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 that the target AN does not support, determine whether all validity judgment flags indicate that the corresponding Personality is valid. If there is one or more validity judgment identifiers in all validity judgment identifiers indicating that the corresponding Personality is invalid, step 32 is performed, otherwise step 34 is performed.
  • the target AN determines whether the ValidFlag corresponding to each PersonalityType is 1. If there is one or more ValidFlag values of 0, the target AN determines to close the session with the access terminal.
  • the embodiment further includes the following steps:
  • Step 34 If all the validity judgment flags indicate that the corresponding Personality is valid, according to the application subtype supported by the AT, it is determined whether the highest Personality type supported by the AT target AN is higher than all Personality types in the Personality information.
  • Step 35 The target AN determines to close the session with the access terminal; otherwise, Step 32: The Target AN determines not to close and access. The session of the terminal.
  • the target AN closes the session with the AT for two purposes: - one purpose is to reestablish the session avoidance with the AN due to session inconsistency caused by business anomalies; another purpose is to Use the best possible service from the target network whenever possible.
  • the target AN supports the highest Personality type for the AT than all the Personality types in the Personality information, if the target AN is not closed, the following problems may occur: The user spends a better service and cannot access the network after entering the network; It also cost money to upgrade to a higher version but not to provide users with better services, resulting in waste.
  • step 34 may be: if the target AN supports all the PersonalityTypes and the corresponding ValidFlag is 1, according to the ATSupportedApplicationSubtypes in the SSI, it is determined whether the highest PersonalityType that can be supported by the AT target AN is higher than the highest PersonalityType in the PersonalityInfo, that is, the AT is determined. Whether the highest PersonalityType supported by the target AN is higher than all PersonalityTypes in PersonalityInfo.
  • ATSupportedApplicationSubtypes contains the application subtype supported by AT.
  • the target AN obtains the service type supported by the AT according to the application subtype supported by the AT, and determines whether the highest PersonalityType that the target AN can support for the AT is higher than all PersonalityTypes in the PersonalityInfo according to the service type supported by the AT.
  • the following method may be adopted: If the subtype of the packet application flow supported by the AT is equal to OxOOOD (Multi-link Multi-Flow Packet Application), the highest service supported by the AT is determined. 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 OxOOOD but equal to 0x0005 (Multi-Flow Packet Application), it is determined that the highest service type supported by the AT is EV-DO Rev.A.
  • OxOOOD Multi-link Multi-Flow Packet Application
  • the highest Personality type that the target AN can support for the AT is related to the degree of support of the AT.
  • the highest personality type supported by the target AN is the EV-DO Rev.B service type, but the service type supported by the AT itself is only the service type of the EV-DO Rev. A, and the highest personality type that the AT target AN can support.
  • Is the EV-DO Rev.A service type (EV-DO Rev.B service type is higher than EV-DO Rev.A service type).
  • the service type supported by the AT itself is the service type of EV-DO Rev. B
  • the highest personality type supported by the target AN is the EV-DO Rev. B service type
  • the highest personalityType that the target AN can support for the AT is EV.
  • the -DO Rev. B service type the target AN establishes a session containing the EV-DO Rev. B Personality for the AT.
  • the target AN determines in step 31 that all PersonalityTypes in the PersonalityInfo are supported.
  • the highest PersonalityType that can be supported by the AT target AN is higher than all PersonalityTypes transferred by the source AN, so in step 35 the target AN determines to close the session with the AT.
  • the target AN first determines whether all the Personality types in the Personality information are supported. When one or more Personality type target ANs in the Personality information are not supported, the target AN cannot maintain the session consistency with the AT, and determines to close the AT. Conversation. When all the Personality types are supported, the target AN determines that the validity judgment identifier 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.
  • the target AN When each validity judgment identifier indicates that the corresponding Personality type is valid, the target AN further determines whether the Personality type that can be supported by the AT target AN is higher than all Personality types in the Personality information transferred by the source AN, and if so, to improve the user.
  • the target AN can negotiate to use a higher service type for the AT Personalis therefore.
  • the target AN needs to close the session with the AT, establish a session containing the personality of the higher service type, and the target AN determines that it is not necessary to close the session with the AT.
  • This embodiment provides the information and the perfect judgment method for the target AN to determine whether to close the session, and solves the defect that the target AN may have a misjudgment when determining whether to close the session when switching between different versions of the AN.
  • FIG. 4 is a flowchart of still another method for closing a session with an access terminal according to an embodiment of the present invention.
  • the high-low ⁇ high-high AN-active ping-pong hard-switching scenario is used.
  • the AN determines whether to close the session with the AT.
  • the first AN is the AN that initiated the handover
  • the second AN is the AN after the first AN switch.
  • the third AN is an AN after the second AN is switched in the active state.
  • 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.
  • 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 saved by the first AN, the first AN sends a session transfer request carrying the Personality information to the second AN; The session information corresponding to the AT saved by the first AN is included.
  • personality information personality information
  • the personality information of the first AN is 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 Personality in the session information corresponding to the first AN and the AT, and the validity judgment identifier corresponding to each set of Personality respectively.
  • Step 42 After the second AN saves the session information transferred from the first AN, it is determined that there is an unsupported Personality type (personality type) in the Personality information. Some attributes or parameters of the Personality that are not supported by the second AN cannot be saved to the session information of the second AN side.
  • personality type personality type
  • 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 the first AN, the second AN in the Personality information has an unsupported Personality type,
  • the second AN saves the session information transferred from the first AN, some attributes or parameters of the personality that the second AN does not support cannot be saved to the session information of the second AN side.
  • the second AN cannot use the Personality attribute and parameter of the Personality type that is not supported by the second AN in the session information corresponding to the first AN and the AT.
  • the second version of the lower version does not recognize the Personality of the first AN, the Personality changes, such as being lost or modified.
  • the second AN After receiving the session transfer request sent by the first AN, the second AN determines whether to close the session according to the method provided in FIG.
  • the second AN is lower than the first AN, and the second AN determines that all the Personality types in the Personality information are determined in the step 31, and the type of the Personality that is not supported by the second AN exists 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 directly in the active state, the second AN does not send a close session message to the AT even if it is determined that the session with the AT needs to be closed, but keeps the active state initiating a session transfer request to the third AN.
  • Step 43 When the second AN keeps the active state 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. Personality should be invalid in Personality.
  • the second AN cannot be saved because the second AN saves the session information transferred from the first AN in step 42 and cannot save certain attributes or parameters of the personality that are not supported by the second AN to the session information of the second AN side. Keep the set of Personality consistent with AT.
  • the second AN keeps the active state from being switched to the third AN, in order for the third AN to learn that the second AN cannot maintain the consistency between the personality and the AT, the second AN generates a validity judgment identifier for the set of personality to identify the invalidity. Add to the Personality information later. For example, for a certain Personality that the second AN cannot maintain the consistency with the AT, the second AN encodes the ValidFlag of the Personality to 0 to identify that the Personality is invalid.
  • Step 44 The second AN keeps the active state and sends the third AN to the third AN.
  • Session transfer request for Personality information The session transfer request further includes a second saved by the second AN.
  • Step 45 After saving the session information transferred from the second AN, the third AN determines that all Personality types in the Personality information of the second AN are supported, and determines that one or more validity judgment identifiers indicate that the corresponding Personality type is invalid. Close the session with the AT.
  • the third AN After receiving the session transfer request of the second AN, the third AN determines whether to close the session according to the method provided in FIG. Since the third AN version is higher than the second AN, the third AN determines all the Personality types supporting the second AN in step 31, but determines in step 33 that one or more validity judgment identifiers exist in the Personality information indicating the corresponding Personality type. Invalid. Therefore, the third AN cannot maintain consistency between these personality and AT, and the third AN determines to close the session with AT.
  • the session transfer request is sent to the third AN, and the personality of the second AN is generated according to the session information corresponding to the second AN and the AT. information.
  • the second AN cannot maintain the validity judgment identifier corresponding to the Personality that is consistent with the AT session, and is encoded as the corresponding Personality is invalid.
  • the third AN cannot maintain the consistency between the personality and the AT because one or more validity judgment identifiers in the second AN's Personality information indicate that the corresponding Personality type is invalid.
  • the third AN determines to close the session with the AT, so that after the AT completes the service, the third AN initiates a session reestablishment to the AT, so that the session of the third AN and the AT is consistent.
  • FIG. 5 is a flowchart of still another method for closing a session with an access terminal according to an embodiment of the present invention.
  • This embodiment mainly described Low ⁇ High ⁇ Low AN between the active state hard handover scenario, the AN determines how switching between whether to close the session with the AT.
  • the Personality type of each personality and the validity judgment identifier corresponding to each set of Personality are respectively represented by the values of the following two parameters: Personality Type and ValidFlag.
  • the Personality Type indicates the type of the personality
  • the ValidFlag is the validity judgment flag, indicating whether the personality is complete and valid.
  • a ValidFlag of 1 indicates that the set of personality is valid
  • a ValidFlag of 0 indicates the set of personality. invalid.
  • this embodiment includes:
  • Step 51 After generating the Personality information (personality information) of the first AN according to the session information corresponding to the AT saved by the first AN, the first AN sends a session transfer request carrying the Personality information to the second AN.
  • the first AN After generating the Personality information (personality information) of the first AN according to the session information corresponding to the AT saved by the first AN, the first AN sends a session transfer request carrying the Personality information to the second AN.
  • the session transfer request further includes session information corresponding to the first AN and the AT.
  • the session transfer request can be carried by the Al 6-Session Transfer Request message.
  • the first and third AN AN AN version lower than the second (intermediate 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 by the first AN, determines that all Personality types in the Personality information are supported, and all the validity judgment identifiers are 1. That is, ValidFlag identifies that the corresponding Personality is valid.
  • the second AN version is higher than the first AN version, and since the higher version AN is backward compatible, the second AN can support all PersonalityTypes of the first AN.
  • the second AN is backward compatible with the session information transferred from the lower version of the first AN, and can be backward compatible with all the Personality attributes and parameters, without loss, and each set of personality is complete and valid.
  • the second AN After receiving the session transfer request of the first AN, the second AN determines whether to close the session according to the method provided in FIG. Since the second AN - remains active, the second AN does not send a close session message to the AT even if the second AN determines to close the session.
  • Step 53 When the second AN keeps the active state 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 the validity judgment identifiers in the Personality information are Is 1.
  • Step 54 The second AN remains active to send 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 Al 6-Session Transfer Request message further includes the session information corresponding to the second AN and the AT saved by the second AN.
  • Step 55 The third AN determines that all Personality types (personality types) in the Personality information are supported, and all the validity judgment identifiers are 1 and the third AN supports the highest Personality type of the AT not higher than all the Personality types in the Personality information. Make sure not to close the session with the AT.
  • the session information transferred by the first AN to the second AN is not lost or changed on the second AN side of the high version.
  • all ValidFlags in the PersonalityInfo generated by the second AN according to the session information corresponding to the second AN and the AT are all 1.
  • the third AN can determine, according to all ValidFlags in the PersonalityInfo, that all Personalities in the session information transferred by the second AN are valid.
  • FIG. 6 is a flowchart of a method for switching between access networks according to an embodiment of the present invention. This embodiment mainly describes the stage in which the target AN determines whether to close the session with the AT during the hard handover between the ANs. As shown in FIG. 6, this embodiment includes:
  • Step 61 The source AN sends a session transfer request (for example, an A 16-Session Transfer Request message) including PersonalityInfo (PersonalityInfo) to the target AN.
  • a session transfer request for example, an A 16-Session Transfer Request message
  • PersonalityInfo PersonalityInfo
  • Step 62A The target AN determines whether to close the session with the AT based on the Personality information (PersonalityInfo).
  • the target AN After receiving the A16-Session Transfer Request message from the source AN, the target AN determines whether to close the session with the AT according to PersonalityInfo.
  • the specific judgment process is shown in Figure 3.
  • Step 62B The target AN sends a session transfer response (for example, an A16-Session Transfer Response message) to the source AN.
  • a session transfer response for example, an A16-Session Transfer Response message
  • Step 63 The source AN sends a session transfer completion response to the destination AN (for example, A16-Session Transfer Complete message).
  • Step 64 Purpose AN provides services for the AT.
  • Step 65 The target AN sends a session release indication (for example, an A16-Session Release Indication message) to the source AN.
  • a session release indication for example, an A16-Session Release Indication message
  • Step 66 The source AN sends a session release response to the destination AN (for example, A16-Session Release
  • Step 67 After the target AN completes the service, close the connection between the target AN and the AT (for example, Connection between AT and Target AN Closes).
  • Step 68 The target AN sends a resource release request (for example, an A13-Resource Release Request message) to the source AN.
  • a resource release request for example, an A13-Resource Release Request message
  • 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 (e.g., a Session Close message) to the AT.
  • a session close message e.g., a Session Close message
  • Step 610 The source AN sends a resource release response (for example, an A13-Resource Release Response message) to the destination AN.
  • a resource release response for example, an A13-Resource Release Response message
  • the session between the target AN and the AT is established.
  • the target AN determines whether to send a Session Close message to the AT to complete the session reestablishment to maintain the session with the AT after the AT completes the service according to the PersonalityInfo. Sex.
  • FIG. 7A is a schematic structural diagram of a source access network device according to an embodiment of the present invention.
  • the source access network device provided by the embodiment of the present invention includes:
  • a generating module 71 configured to generate the source access network according to session information corresponding to the access terminal saved by the source access network during a process of the access terminal switching from the source access network to the target access network
  • the personality information of the side includes the personality type of each set of personality in the session information and the validity judgment identifier corresponding to each set of personality respectively; the validity judgment identifier corresponding to each set of personality is used to identify that the set of personality is invalid. Or effective.
  • the session transfer request sending module 72 is configured to send, by the source access network, a session transfer request including the personality information generated by the generating module 71 to the target access network, so that the target access network determines, according to the personality information, Whether the access terminal closes the session with the access terminal after completing the service.
  • the generating module 71 includes: a type determining unit 711 and a validity encoding unit 712.
  • the type determining unit 711 is configured to determine a Personality type of each set of Personality in the session information.
  • the validity coding unit 712 is configured to save integrity and transmission integrity of each set of personality according to the session information corresponding to the access terminal saved in the source access network, or according to the save to the source access network The sending integrity of each set of personality information of the session information corresponding to the access terminal, determining the validity of each set of personality in the session information, and generating a validity judgment identifier.
  • the validity coding unit 712 is specifically configured to be used in When a set of personality in the session information is incomplete or incompletely transmitted, it is determined that the set of personality is invalid, and a validity judgment identifier that identifies that the set of personality is invalid is generated; a set of personality in the session information is saved and sent. When complete, determine that the set of Personality is valid, and generate a validity judgment identifier that identifies the set of Personality; determine the validity of each set of Personality in the session information by using the above method, and generate an identifier for each set of Personality.
  • Valid validity judgment indicator when determining the validity of each set of personality in the session information and generating a validity judgment identifier according to the preservation integrity and the transmission integrity of each set of personal information of the session information: the validity coding unit 712 is specifically configured to be used in When a set of personality in the session information is incomplete or incompletely transmitted, it is determined that the set of personality is invalid, and a validity judgment identifier that identifies that the set of personality is invalid is
  • the validity encoding unit 712 is specifically configured to use the session information.
  • a set of Personality is incomplete, it determines that the set of Personality is invalid, and generates a validity judgment identifier that identifies that the set of Personality is invalid;
  • a set of Personality in the session information is sent completely, it determines that the set of Personality is valid, and generates Identifying the effective validity judgment identifier of the set of Personality; judging the meeting by the above method
  • the validity of each set of Personality in the message, and a valid validity judgment flag for each set of Personality is generated for each set of Personality.
  • the session transfer request sending module 72 adds the personality type and each set of each set of personality in the session information corresponding to the AT stored in the session transfer request sent by the local end to the target AN.
  • Personality's validity judgment indicator The Personality type of each set of Personality in the session transfer request reflects the type of Personality used by the source AN and the AT session. If the target AN does not support these Personality types, the target AN cannot maintain session consistency with the AT.
  • the effectiveness judgment identifier of each set of Personality in the session transfer request reflects the validity of the source AN for each set of Personality saved by 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. 8 is a schematic structural diagram of a target access network device according to an embodiment of the present invention.
  • the target access network device provided by the embodiment of the present invention includes: a session transfer request receiving module 81, a session close determining module 82, and a close message sending module 83.
  • a session transfer request receiving module 81 configured to receive the source access network, including
  • the personality information includes the source access network, the personality type of each set of personality in the session information corresponding to the access terminal, and the validity judgment identifier corresponding to each set of personality respectively.
  • the session close judgment module 82 is configured to determine, according to the Personality information received by the session transfer request receiving module 81, whether to close the session with the access terminal.
  • the session closure determining module 82 is specifically configured to: if the target access network supports all the personality types in the personality information, and all the validity determination identifiers in the personality information identify that the corresponding personality is valid, and the target access is The network determines that the highest personality type supported by the access terminal is not higher than all the personality types in the personality information, and determines not to close the session with the access terminal, and otherwise determines to close the session with the access terminal.
  • the closing message sending module 83 is configured to: when the session closing determining module 82 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 session close judgment module 82 includes: a first support judging unit 821, a validity judging unit 822, a second support judging unit 823, and a session close determining unit 824.
  • the first support determining unit 821 is configured to determine whether the Personality type that is not supported by the target access network exists in the Personality information.
  • the validity determining unit 822 is configured to determine, if the first support determining unit 821 does not have a Personality type that is not supported by the target access network, determine whether all the validity determining identifiers in the Personality information indicate that the corresponding Personality is valid.
  • the second support determining unit 823 is configured to: if the validity determining unit 822 determines that all the validity determining identifiers indicate that the corresponding personality is valid, according to the application subtype supported by the access terminal, the target access network determines, for the access 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 close determining unit 824 is configured to: if the first support determining unit 821 determines that there is a Personality type that is not supported by the target access network, determine to close the session with the access terminal; if the first support determining unit 821 determines that all the valid One or more personality validity determination identifiers in the sexual judgment identifier indicate that the corresponding personality is invalid, and it is determined to close the session with the access terminal; if the second support determining unit 823 determines that the target access network supports the access terminal The highest Personality type is higher than all Personality types in the Personality information, and it is determined to close the session with the access terminal.
  • the session close determination module 82 determines whether the target AN can be consistent with the session between the ATs according to the Personality information in the session transfer request, thereby determining whether to close the session with the AT.
  • the misjudgment of the target AN due to insufficient information is avoided. Therefore, the embodiment of the present invention solves the defect that the target AN determines whether to close the session or not, and the judgment method is imperfect, and avoids the target AN misjudgment.
  • the occurrence of phenomena can avoid business anomalies, save bandwidth, and improve user experience.

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Abstract

本发明实施例提供一种关闭与接入终端间会话的方法和设备。该方法包括：接入终端从源接入网络向目标接入网络切换过程中，根据源接入网络保存的与接入终端对应的会话信息，生成源接入网络侧的Personality信息；Personality信息包括该的会话信息中各套Personality的Personality类型和各套Personality分别对应的有效性判断标识；向目标接入网络发送包括有Personality信息的会话转移请求。本发明实施例避免了AN间切换过程中目标AN判断是否关闭会话时产生误判的现象。

Description

关闭与接入终端间会话的方法和设备
技术领域
本发明实施例涉及通信技术， 尤其涉及一种关闭与接入终端间会话的方 法和设备。 背景技术
CDMA 2000 EV-DO ( Evolution Data Only, 只为用于移动数据 ) 系统的 不同版本的接入网络（ Access Network, 简称 AN ) 间切换时， 源 AN保存的 与接入终端（ Access Terminal ,简称 AT )对应的会话信息包括多套 Personality (个性） ， 一套 Personality为一套协商完整的协议子类型、 应用层子类型、 属性值和公共数据的集合， 通过 Personality目标 AN可与 AT进行通信。 AT 和 AN通过协商， 约好使用属性以及参数的值， 这些属性以及参数分为多套 personality保存,每套 ersonality对应一种业务类型 ,每套 ersonality的性能、 功能上的能力有差异， 在不同的网络和载频上应用不同的业务类型。
如果在源 AN所建立的会话里有一个或多个 personality不是目标 AN所 支持的 personality类型 （个性类型） ， 那么目标 AN可以通过关闭会话并重 新通过初始配置协商的方式建立与 AT之间的会话， 使所有 personality 目标 AN都支持。如果源 AN转移过来的会话里，有一套或多套 Personality所保存 的内容不能保证与 AT的会话一致性， 则目标 AN可通过关闭会话并重新通 过初始协商的方式建立与 AT之间的会话， 使会话里所有 Personality所保存 的内容都确保与 AT的会话一致性。 如果目标 AN对于该 AT, 能支持比源 AN转移过来的所有 personality类型更高的业务类型，则目标 AN可通过关闭 会话并重新通过初始协商的方式建立与 AT之间的会话，从而让该 AT在目标 AN网络里可使用更优的功能、 性能。
AN间激活态单向硬切换场景如下： AT与源 AN建立会话， 建立连接进 入激活态。 源 AN向目标 AN发送 Al 6-Session Transfer Request消息 ,请求传 递保存的与 AT对应的会话信息。若目标 AN版本比源 AN版本低， 源 AN传 递的会话信息包含目标 AN不支持的 personality,由于目标 AN对不支持的配 置协商属性和参数无法使用， 甚至可能会无法保存或被修改， 会导致 AT与 AN的会话可能会产生不一致， 因此目标 AN需要关闭与 AT间的会话， 重建 与 AT的会话以建立目标 AN完全支持的 personality; 若目标 AN版本比源 AN本高， 则在目标测 AN对同种终端可能支持更高版本的 personality, 因此 也需要关闭会话进行会话重建。 AT在目标 AN完成上传下载或其它业务后， 目标 AN通过 Session Close消息关闭与 AT的会话， 通过初试配置协商， 重 新建立目标 AN完全支持的会话。
然而， 现有技术虽记载了目标 AN可通过关闭会话的方式， 保持与 AT 间会话的一致性， 但没有提供完善的方法使目标 AN判断是否关闭会话， 并 且也没有提供目标 AN判断是否关闭会话时所依据的信息。 因此， 不论在 AN 间激活态单向硬切换场景， 还是 AN间激活态乒乓硬切换场景， 或者是连续 在多个 AN之间保持激活态硬切换的场景， 目标 AN在判断是否关闭会话时 都可能会产生误判。 发明内容
本发明实施例提供一种关闭与接入终端间会话的方法和设备， 用以解决 AN 间切换过程中目标 AN判断是否关闭会话时有可能产生误判导致业务异 常的缺陷。
本发明实施例提供一种关闭与接入终端间会话的方法， 包括：
接入终端从源接入网络向目标接入网络切换过程中 , 所述源接入网络根 据所述源接入网络保存的与所述接入终端对应的会话信息， 生成源接入网络 侧的 Personality 信息； 所述 Personality 信息包括所述会话信息中各套
Personality的 Personality类型和各套 Personality分别对应的有效性判断标识； 所述源接入网络向目标接入网络发送包括有所述 Personality信息的会话 转移请求， 以使所述目标接入网络根据所述 Personality信息判断在所述接入 终端完成业务后是否关闭与所述接入终端的会话， 当确定关闭与接入终端的 会话时， 在所述接入终端完成业务后， 向所述接入终端发送会话关闭消息。
本发明实施例提供另一种关闭与接入终端间会话的方法， 包括： 目标接入网络接收源接入网络发送的包括有 Personality信息的会话转移 请求； 所述 Personality信息包括所述源接入网络保存的与接入终端对应的会 话信息中各套 Personality的 Personality类型和各套 Personality分别对应的有 效性判断标识；
目标接入网络根据所述 Personality信息判断是否关闭与接入终端的会 话；
所述目标接入网络根据 Personality信息确定关闭与接入终端的会话时， 在所述接入终端完成业务后， 向所述接入终端发送会话关闭消息。
本发明实施例提供一种源接入网络设备， 包括：
生成模块， 用于接入终端从源接入网络向目标接入网络切换过程中， 根 据所述源接入网络保存的与所述接入终端对应的会话信息， 生成源接入网络 侧的 Personality 信息； 所述 Personality 信息包括所述会话信息中各套 Personality的 Personality类型和各套 Personality分别对应的有效性判断标识； 会话转移请求发送模块， 用于所述源接入网络向目标接入网络发送包括 有所述 Personality信息的会话转移请求， 以使所述目标接入网络根据所述 Personality信息判断在所述接入终端完成业务后是否关闭与所述接入终端的 会话。
本发明实施例提供一种目标接入网络设备， 包括： 会话转移请求接收模 块， 用于接收源接入网络发送的包括有 Personality信息的会话转移请求； 所 述 Personality信息包括所述源接入网络保存的与接入终端对应的会话信息中 各套 Personality的 Personality类型和各套 Personality分别对应的有效性判断 标识；
会话关闭判断模块， 用于根据所述 Personality信息判断是否关闭与接入 终端的会话；
会话关闭消息发送模块， 用于所述目标接入网络根据 Personality信息确 定关闭与接入终端的会话时， 在所述接入终端完成业务后， 向所述接入终端 发送会话关闭消息。
本发明实施例的关闭与接入终端间会话的方法和设备， 源 AN在发送给 目标 AN的会话转移请求中， 包括本端保存的与 AT对应的会话信息中各套 Personality的 Personality类型和各套 Personality的有效性判断标识。 因此， 目标 AN可根据会话转移请求中的 Personality信息， 确定是否关闭与 AT的 会话。 本发明实施例避免了 AN间切换过程中目标 AN判断是否关闭会话时 产生误判的现象。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍， 显而易见地， 下 面描述中的附图是本发明的一些实施例， 对于本领域普通技术人员来讲， 在 不付出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的一种关闭与接入终端间会话的方法流程图； 图 2 为本发明实施例提供的另一种关闭与接入终端间会话的方法流程 图；
图 3为图 2中步骤 22的一种流程图；
图 4 为本发明实施例提供的又一种关闭与接入终端间会话的方法流程 图；
图 5 为本发明实施例提供的再一种关闭与接入终端间会话的方法流程 图； 图 6为本发明实施例提供的一种接入网络间切换方法流程图；
图 7A为本发明实施例提供的一种源接入网络设备结构示意图； 图 7B为本发明实施例提供的另一种源接入网络设备结构示意图； 图 8A为本发明实施例提供的一种目标接入网络设备结构示意图； 图 8B为本发明实施例提供的另一种目标接入网络设备结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于 本发明中的实施例， 本领域普通技术人员在没有付出创造性劳动前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
现有技术虽记载了目标 AN可通过关闭会话的方式， 保持与 AT间会话 的一致性， 但没有提供完善的方法使目标 AN判断是否关闭会话， 并且也没 有提供目标 AN判断是否关闭会话时所依据的信息。 不论在 AN间激活态单 向硬切换场景， 还是 AN间激活态乒乓硬切换， 或者是连续在多个 AN之间 保持激活态硬切换的场景， 目标 AN在判断是否关闭会话时都可能会产生误 判。 例如， 不需要关闭会话时目标 AN误判为关闭会话， 则发起会话重建会 影响激活时延， 占用带宽。 又例如， 需要关闭会话时目标 AN误判为不关闭 会话， 若目标 AN与 AT的会话不一致， 则会导致业务异常、 影响业务性能 甚至功能。 又例如， 目标 AN与 AT的会话一致， 目标 AN没有发起会话重 建， 如果目标 AN对于该 AT可使用更高业务类型， 由于目标 AN没有发起 会话重建而仍使用源 AN传递过来的业务类型较低的会话信息， 则会导致用 户无法体验更优性能或功能。
本发明实施例针对 AN间激活态硬切换的各种场景下， 目标 AN判断是 否需要关闭会话时由于所依据的信息不足有可能产生误判的缺陷， 源 AN向 目标 AN发送的会话转移请求中增加了 Personality信息， 以供目标 AN判断 是否需要关闭会话。
图 1为本发明实施例提供的一种关闭与接入终端间会话的方法流程图。 以下主要从发起 AN切换的源 AN角度说明本发明实施例。 需要说明是， 在 任何 AN间硬切换的场景下， 向另一个 AN发起 AN间硬切换的 AN, 在发送 会话转移请求之前都要执行以下步骤。 如图 1所示， 本实施例包括：
步骤 11： 接入终端从源 AN向目标接入网络切换过程中， 根据源 AN保 存的与接入终端对应的会话信息， 生成源 AN侧的 Personality信息 （个性信 息） 。
源 AN保存的与 AT对应的会话信息可以是该源 AN与 AT协商后建立的 会话信息（此时该源 AN为单向切换场景中发起 AN切换的 AN, 即 AT在该 源 AN初始接入 ) ,也可以是其它 AN与 AT协商后迁移到该源 AN的会话信 息（此时该源 AN为乒乓切换场景中的中间 AN,即 AT在其它 AN初始接入 )„ 源 AN生成 Personality信息的具体方法可如下：
源 AN首先确定源 AN保存的与 AT对应的会话信息中各套 Personality 的 Personality类型。其中， Personality类型包括： EV-DO Rel 0( Evolution, Data Only Release 0 ) 业务类型， EV-DO Rev. A ( Evolution, Data Only Revision A ) 业务类型和 EV-DO Rev.B( Evolution, Data Only Revision B )业务类型。 EV-DO Rel 0业务类型低于 EV-DO Rev.A业务类型， EV-DO Rev.A业务类型低于 EV-DO Rev.B业务类型。 可结合源 AN保存的与 AT对应的会话信息中的协 议子类型来确认各套 Personality的 Personality类型， 例如： 物理协议子类型 是 0则表示该套 personality业务类型为 EV-DO RelO,物理协议子类型为 2的 表示该套 personality业务类型为 EV-DO Rev.A, 物理协议子类型为 3的表示 该套 personality业务类型为 EV-DO Rev.A。
AN保存与 AT对应的会话信息中 Personality有可能丟失或被修改，从而 导致该套 Personality无效。 因此， 源 AN在生成 Personality信息时， 还需判 断与 AT对应的会话信息中各套 Personality的有效性并生成有效性判断标识。 各套 Personality分别对应的有效性判断标识用于标识该套 Personality无效或 有效。
源 AN在保存和发送与 AT对应的会话信息的过程中， 可通过发送完整性， 判断该会话信息中各套 Personality的有效性， 并生成各套 Personality的有效性 判断标识。 发送完整性定义如下： 对于协商成功的， 非协议默认值的协议子 类型、属性和参数值， 都支持在会话转移消息里编码发送给目标 AN.。 这里协 商成功的， 非协议默认值的协议子类型、 属性和参数值包括所述源 AN与所述 终端进行协商的， 非协议默认值的协议子类型、 属性和参数值， 也包括在其 它 AN协商成功后转移到该源 AN的非协议默认值的协议子类型、 属性和参数 值。 在该会话信息中一套 Personality发送不完整时， 确定该套 Personality无效， 并生成标识该套 Personality无效的有效性判断标识； 在该会话信息中的一套 Personality发送完整时， 确定该套 Personality有效， 并生成标识该套 Personality 有效的效性判断标识。
源 AN在保存和发送与 AT对应的会话信息的过程中， 也可通过保存完 整性和发送完整性， 判断该会话信息中各套 Personality的有效性， 并生成各 套 Personality的有效性判断标识。 在该会话信息中一套 Personality保存不完 整或发送不完整时， 确定该套 Personality无效， 并生成标识该套 Personality 无效的有效性判断标识； 在该会话信息中的一套 Personality保存完整且发送 完整时， 确定该套 Personality有效， 并生成标识该套 Personality有效的效性 判断标识。 保存完整性， 是指对于协商成功的、 非协议默认值的属性、 参数、 协议子类型都保存下来， 发送完整性， 是指从源 AN切换向其它 AN时， 源 AN支持在会话转移消息里将保存在源 AN会话里的该套 personality的协议子 类型、 属性、 参数都编码到 SSI信息里。
对于 AT在该源 AN初始接入，该源 AN与 AT通过协商建立的会话信息， 如果该源 AN能成功保存与 AT协商成功的会话信息中某套 personality的非 协议默认值的协议子类型、 属性和参数值， 且该源 AN切换向目标 AN时， 该源 AN所保存的该套 Personality的协议子类型、 属性和参数值在会话迁移 消息中能完整发送， 则该套 Personality是有效的， 该源 AN 生成标识该套 Personality有效的有效性判断标识； 否则， 该套 Personality是无效的， 该源 AN生成标识该套 Personality无效的有效性判断标识。
对于其它 AN与 AT协商并建立会话信息后， 通过 AN间切换将该会话 信息传递到该源 AN的会话信息（例如通过 A16-Session Transfer Request消息 或 A13-Session Transfer Request消息迁移到该源 AN的会话信息 ) ,如果该源 AN能成功保存其它 AN与 AT协商成功的会话信息中某套 personality的非协 议默认值的协议子类型、 属性和参数值， 且该源 AN切换向目标 AN时， 该 源 AN所保存的该套 Personality的协议子类型、 属性和参数值在会话转移消 息中都能完整发送， 则该套 Personality是有效的， 该源 AN 生成标识该套 Personality有效的有效性判断标识； 否则， 该套 Personality是无效的， 该源 AN生成标识该套 Personality无效的有效性判断标识。
该源 AN向目标 AN发送会话转移请求中包括上述保存的会话信息， 此 处的发送包括编码阶段和发送阶段， 在编码阶段如果该源 AN没有对保存完 整的某套 Personality的所有协议子类型、 属性和参数值进行编码， 而只对该 套 Personality的部分协议子类型、 属性和参数值进行了编码， 该源 AN确定 向目标 AN发送的该套 Personality不完整， 即该套 Personality发送不完整。 对该源 AN保存某套 Personality不完整的说明： 如果某套 ersonality中存在 一个或多个协商成功且非协议默认值的值， 没有被该源 AN成功保存， 则该 源 AN保存的该套 personality是不完整的。
步骤 12:源 AN向目标 AN发送包括有 Personality信息的会话转移请求， 以使目标 AN根据 Personality信息判断在接入终端完成业务后是否关闭与接 入终端的会话， 当确定关闭与接入终端的会话时， 在接入终端完成业务后， 向接入终端发送会话关闭消息。 源 AN将步骤 11中生成的 Personality信息 , 添加到即将发送给目标 AN 的会话转移请求中。 目标 AN接收到源 AN发送的会话转移请求后， 根据其 中添加的源接入网络的 Personality信息， 确定是否关闭与 AT的会话。
在会话转移请求中添加 Personality信息的一种具体实施方式如下：源 AN 可在会话状态信息（ Session State Information , 简称 SSI ) 中增加 Personality 信息： Personalitylnfo, 指示转移的会话里所有 personality类型的构成。
具体地 , 每套 ersonality的信息： 每套 ersonality的 Personality类型和 每套 Personality对应的有效性判断标识， 可分别通过以下两个参数表示： PersonalityType和 ValidFlag。 其中 , PersonalityType表示该套 ersonality的 类型， 0x0表示 personality类型为 EV-DO RelO , OxA表示 personality类型为 EV-DO Rev. A, OxB表示 personality类型为 EV-DO Rev.B; ValidFlag表示该 套 personality是否是完整有效， 能否与 AT保持一致性。 ValidFlag为 1表示 该套 personality有效，即源 AN保存的该 personality与 AT保持一致； ValidFlag 为 0表示该套 personality无效， 该套 personality可能被修改过或有属性丟失， 无法保证与 AT完全一致。
可在 main personality里会话十办商十办议 ( Session Configuration Protocol, 简称 SCP ) 层的 SSI 里增加以下参数： ParameterType、 Length 和 PersonalityNum , 描述 Personalitylnfo 中 personality的个数、 Personalitylnfo 的长度等信息。其中， ParameterType为一种新增的参数类型，表示 personality 类型指示参数； Length 值表示（PersonalityNum x 2+1)个字节的长度； PersonalityNum: 表示有多少个 personality。
以上两个参数 PersonalityType和 ValidFlag成套出现 ,表示一个 Personality 的信息。 它们的套数等于 PersonalityNum 个。 如果有多个 ersonality , PersonalityType的 4非歹1 1顷序由 [氐至高, main personality的 PersonalityType 最前。
本发明实施例接入网络间切换方法， 源 AN在发送给目标 AN的会话转 移请求中， 添加了本端保存的与 AT对应的会话信息中各套 Personality 的 Personality类型和各套 Personality的有效性判断标识。 因此， 目标 AN可根据 会话转移请求中的 Personality信息， 判断目标 AN能否与 AT间的会话保持 一致， 从而确定是否关闭与 AT的会话， 避免了 AN间切换过程中目标 AN 判断是否关闭会话时产生误判的现象。 本发明实施例对同版本 AN间切换无 影响， 适用于相同版本 AN间， 不同版本 AN间， 单向切换及乒乓切换等各 种场景。
图 2 为本发明实施例提供的另一种关闭与接入终端间会话的方法流程 图。 以下主要从接收到另一 AN的切换请求的目标 AN角度说明本发明实施 例。 需要说明是， 在 AN间硬切换时， 接收到另一个 AN发送的会话转移请 求后的 AN, 都需要执行以下步骤。
如图 2所示， 本实施例包括：
步骤 21： 目标 AN接收源 AN发送的包括有 Personality信息（个性信息 ) 的会话转移请求； Personality信息包括源 AN保存的与 AT对应的会话信息中 各套 Personality (个性 ) 的 Personality类型 （个性类型 )和各套 Personality 分别对应的有效性判断标识。
为使目标 AN具有足够的信息判决是否进行关闭会话， 源 AN在向目标 AN 发送的会话转移请求 （ A16-Session Transfer Request 消息） 中添加 Personality信息。会话转移请求中还包括源 AN保存的源 AN与 AT对应的会 话信息。 其中， Personality信息包括源 AN保存的与 AT对应的会话信息中各 套 Personality的 Personality类型 , 还包括各套 Personality分别对应的有效性 判断标识。
Personality对应的有效性判断标识， 用于标识该套 Personality无效或有 效。 该套 Personality无效时， 源 AN保存的会话里该套 Personality与 AT不 一致， 也就是源 AN转移给目标 AN的会话里该套 Personality与 AT不一致； 反之， 该套 Personality有效时， 源 AN转移给目标 AN 的会话信息里该套 Personality与 AT保持一致。 因此， Personality对应的有效性判断标识也用于 标识源 AN转移给目标 AN的会话里该套 Personality是否与 AT保持一致。
步骤 22: 目标 AN根据 Personality信息判断是否关闭与 AT的会话。 目标 AN通过 Personality信息中各 Personality类型， 可确定是否支持源 AN转移给目标 AN的会话信息中 Personality类型；通过 Personality信息中有 效性判断标识， 目标 AN可确定源 AN转移给目标 AN的会话信息中相应的 Personality是否有效。
步骤 23: 目标 AN根据 Personality信息确定关闭与 AT的会话时，在 AT 完成业务后向 AT发送会话关闭消息。
AT在目标 AN完成业务后， 如果在步骤 12中目标 AN确定关闭与接入 终端的会话， 向 AT发送会话关闭消息， 重新建立目标 AN完全支持的会话。
本发明实施例目标接入网络关闭与接入终端间会话的方法， 源 AN在发 送给目标 AN的会话转移请求中包括有源 AN本端保存的与 AT对应的会话 信息中各套 Personality的 Personality类型和各套 Personality的有效性判断标 识。 目标 AN可根据会话转移请求中的 Personality信息， 判断目标 AN能否 与 AT间的会话保持一致， 从而确定是否关闭与 AT的会话。 避免了目标 AN 由于依据的信息不充分产生的误判。 因此， 本发明实施例解决了 AN间切换 过程中目标 AN判断是否关闭会话时所依据的信息不足、 判断方法不完善的 缺陷， 避免了目标 AN误判现象的发生， 可避免业务异常， 也可节省带宽， 并可提高用户体验。
本发明实施例对同版本 AN间切换无影响， 适用于单向切换及乒乓切换 等各种场景。
图 3为图 1中步骤 22的一种流程图。 图 2中步骤 22具体判断过程如图 3所示：
步骤 31： 目标 AN判断 Personality信息（个性信息）中是否存在目标 AN 不支持的 Personality类型（个性类型）。 若存在目标 AN不支持的 Personality 类型， 执行步骤 32; 否则执行步骤 33。
具体地，目标 AN判断 SSI中 Personalitylnfo的所有 PersonalityType中是 否存在目标 AN不支持的 PersonalityType。
步骤 32: 目标 AN确定不关闭与 AT的会话。
Personality 信息包括源 AN 支持的一个或多个 Personality 类型。 当
Personality信息中存在目标 AN不支持的 Personality类型时， 即 Personality 信息中有一个或多个 Personality类型是目标 AN不支持的类型时， 目标 AN 确定关闭与接入终端的会话。
例如， 高版本的 AN向低版本的 AN切换场景， 由于目标 AN的版本低 于源 AN, 目标 AN不支持源 AN转移过来的某个或多个 PersonalityType。 根 据以上判断流程， 在步骤 31中目标 AN确定在源 AN的所有 PersonalityType 中存在不支持的 PersonalityType, 在步骤 32中目标 AN确定关闭与 AT之间 的会话。
步骤 33: 若不存在目标 AN不支持的 Personality类型， 判断所有有效性 判断标识是否均表示相应 Personality有效。 若所有有效性判断标识中存在一 个或多个有效性判断标识表示相应 Personality无效， 执行步骤 32, 否则执行 步骤 34。
具体地，若不存在目标 AN不支持的 PersonalityType, 目标 AN判断每个 PersonalityType对应的 ValidFlag是否均为 1。若存在一个或多个 ValidFlag的 值为 0, 目标 AN确定关闭与接入终端的会话。
进一步， 在目标 AN与 AT会话时， 为使 AT尽可能使用目标 AN提供的 最优业务， 从而用户能体验到更优的性能， 本实施例还包括以下步骤：
步骤 34: 若所有有效性判断标识均表示相应 Personality有效， 根据 AT 支持的应用子类型， 判断对于该 AT 目标 AN支持的最高 Personality类型是 否高于 Personality信息中所有 Personality类型。
若对于该 AT 目标 AN支持的最高 Personality类型高于源 AN转移过来 的 Personality信息中所有 Personality类型， 为使目标 AN采用支持的最高 Personality类型与 AT会话， 执行步骤 35: 目标 AN确定关闭与接入终端的 会话； 否则执行步骤 32: 目标 AN确定不关闭与接入终端的会话。
从低版本 AN切到高版本 AN,目标 AN关闭与 AT间的会话有两个目的： —个目的是重建与 AN间的会话避名由于会话不一致导致的业务异常； 另一 个目的是， 是为了尽可能使用目标网络提供的最优业务。 在目标 AN对于该 AT支持的最高 Personality类型高于 Personality信息中所有 Personality类型时， 如果目标 AN不关闭会产生以下问题： 用户花钱购买了更优的服务， 进入网 络后却无法使用； 目标网络也花了钱升级为更高版本却不能用户提供更优的 服务， 造成浪费。
具体地， 步骤 34 可为， 若目标 AN 支持所有 PersonalityType且对应 ValidFlag均为 1 , 根据 SSI中 ATSupportedApplicationSubtypes, 判断对于该 AT 目标 AN能支持的最高 PersonalityType是否高于 Personalitylnfo 中最高 PersonalityType, 即判断对于该 AT目标 AN支持的最高 PersonalityType是否 高于 Personalitylnfo中所有 PersonalityType。
其中， ATSupportedApplicationSubtypes, 包含 AT支持的应用子类型。 目 标 AN根据 AT支持的应用子类型获取 AT支持的业务类型，根据 AT支持的 业务类型判断目标 AN对于该 AT 能支持的最高 PersonalityType是否高于 Personalitylnfo中所有 PersonalityType。
根据 AT支持的应用子类型获取 AT支持的业务类型时，可采用如下方法： 若 AT支持的分组应用流的子类型等于 OxOOOD ( Multi-link Multi-Flow Packet Application ) , 则确定 AT支持的最高业务类型为 EV-DO Rev.B业务类型； 若 AT支持的分组应用流的子类型小于 OxOOOD, 但等于 0x0005 ( Multi-Flow Packet Application ) , 则确定 AT支持的最高业务类型为 EV-DO Rev.A业务 类型；若 AT支持的分组应用流的子类型小于 0x0005 ,仅支持 0x0002( Default Packet Application ) , 则确定 AT支持的最高业务类型为 EV-DO RelO业务类 型。
目标 AN对于 AT能支持的最高 Personality类型，与该 AT的支持程度相 关。 例如目标 AN支持的最高 personality类型为 EV-DO Rev.B业务类型， 但 该 AT本身支持的业务类型仅为 EV-DO Rev.A的业务类型， 则对于该 AT目 标 AN能支持的最高 personality类型为 EV-DO Rev.A业务类型（ EV-DO Rev.B 业务类型高于 EV-DO Rev.A业务类型） 。 若该 AT本身支持的业务类型为 EV-DO Rev.B的业务类型， 且目标 AN支持的最高 personality类型为 EV-DO Rev.B业务类型，则目标 AN对该 AT能支持的最高 PersonalityType为 EV-DO Rev.B业务类型，目标 AN对该 AT建立包含 EV-DO Rev.B Personality的会话。
例如， 低版本 AN向高版本 AN切换的场景， 通常情况下高版本 AN支 持低版本 AN的所有 PersonalityType,但作为目标 AN的高版本 AN有可能支 持更高类型的 Personality。 根据以上判断流程， 目标 AN在步骤 31中确定支 持 Personalitylnfo中的所有 PersonalityType。 但在步骤 34中根据 AT应用子 类型， 对于该 AT目标 AN能支持的最高 PersonalityType高于源 AN转移过 来的所有 PersonalityType , 因此在步骤 35 目标 AN确定关闭与 AT之间的会 话。
本实施例， 目标 AN先判断是否支持 Personality信息中所有 Personality 类型， 当 Personality信息中有一个或多个 Personality类型目标 AN不支持， 则目标 AN无法保持与 AT的会话一致性，确定关闭与 AT的会话。在支持所 有 Personality类型时， 目标 AN再判断 Personality信息识中所有效性判断标 识表示相应 Personality类型为有效。 如果存在一个或多个效性判断标识表示 相应 Personality类型为无效， 目标 AN也无法保持与 AT的会话一致性， 因 此确定关闭与 AT的会话。 在每个有效性判断标识均表示相应 Personality类 型为有效时， 目标 AN进一步判断对于该 AT 目标 AN能支持的 Personality 类型是否高于源 AN转移过来的 Personality信息中所有 Personality类型， 若 是， 为提高用户体验， 目标 AN对于该 AT 可协商使用更高业务类型的 Personalis 因此。 目标 AN需要关闭与 AT间的会话， 建立包含更高业务类 型的 personality的会话， 反之目标 AN确定不需要关闭与 AT间的会话。 本 实施例提供了目标 AN判断是否关闭会话所依据的信息和完善的判断方法， 解决了不同版本 AN间切换时， 目标 AN判断是否需要关闭会话时有可能产 生误判的缺陷。
图 4 为本发明实施例提供的又一种关闭与接入终端间会话的方法流程 图。 本实施例主要说明高→低→高 AN间激活态乒乓硬切换场景下， 切换后 AN如何判断是否关闭与 AT间的会话。对于高→低→高的两个 AN间激活态 乒乓硬切换或三个 AN间激活态连续硬切换的场景， 第一 AN为初始发起切 换的 AN, 第二 AN为第一 AN切换后的 AN, 第三 AN为第二 AN在保持激 活态下切换后的 AN。 其中， 第一 AN和第三 AN的版本高于第二 AN (中间 AN ) 。 第一 AN和第三 AN可以是同一 AN, 也可以不同的 AN。 如图 4所 示， 本实施例包括：
步骤 41 : 第一 AN根据第一 AN保存的与 AT对应的会话信息生成第一 AN的 Personality信息 （个性信息）后， 向第二 AN发送携带有 Personality 信息的会话转移请求； 会话转移请求中还包括第一 AN保存的与 AT对应的 会话信息。
第一 AN向第二 AN切换时，先根据第一 AN保存的第一 AN与 AT对应 的会话信息生成第一 AN的 Personality信息。 第一 AN的 Personality信息包 括第一 AN与 AT对应的会话信息中各套 Personality的 Personality类型和各 套 Personality分别对应的有效性判断标识。
步骤 42：第二 AN保存从第一 AN转移过来的会话信息后，确定 Personality 信息中存在不支持的 Personality类型 （个性类型） 。 其中， 第二 AN不支持 的 Personality的某些属性或参数不能保存到第二 AN侧的会话信息中。
第二 AN接收到第一 AN发送的会话转移请求后， 由于第二 AN的版本 低于第一 AN, Personality信息中第二 AN存在不支持的 Personality类型， 第 二 AN保存从第一 AN转移过来的会话信息时， 不能将其中第二 AN不支持 的 personality的某些属性或参数保存到第二 AN侧的会话信息中。 例如， 第 二 AN 无法使用第一 AN 与 AT 对应的会话信息中第二 AN 不支持的 Personality类型的 Personality属性和参数。又例如， 由于低版本的第二 AN无 法识别第一 AN的 Personality,而使 Personality发生变化，例如丟失或被修改。
第二 AN接收到第一 AN发送的会话转移请求后， 根据图 3提供的方法 判断是否关闭会话。 由于第二 AN版本低于第一 AN, 第二 AN在步骤 31中 通过判断 Personality信息中所有 Personality类型， 可确定第一 AN保存的与 AT对应的会话信息中存在第二 AN不支持的 Personality类型，进而确定关闭 与 AT的会话。 由于第二 AN—直保持激活态， 第二 AN即使确定需要关闭 与 AT间的会话， 也不会向 AT发送关闭会话消息， 而是保持激活态向第三 AN发起会话转移请求。
步骤 43: 第二 AN保持激活态向第三 AN切换时， 第二 AN根据保存的 第二 AN与 AT对应的会话信息生成第二 AN的 Personality信息。在 Personality 应 Personality无效。
由于步骤 42中第二 AN保存从第一 AN转移过来的会话信息时， 不能将 其中第二 AN不支持的 personality的某些属性或参数保存到第二 AN侧的会 话信息中， 第二 AN无法保持该套 Personality与 AT的一致性。 第二 AN保 持激活态向第三 AN 切换时， 为使第三 AN 获知第二 AN 无法保持该套 personality与 AT间的一致性，第二 AN对该套 Personality生成标识其无效的 有效性判断标识后添加到 Personality信息。 例如， 对于第二 AN无法保持与 AT一致性的某套 Personality, 第二 AN将该套 Personality的 ValidFlag编码 为 0 , 以标识该套 Personality无效。
步骤 44 : 第二 AN 保持激活态向第三 AN 发送携带有第二 AN 的
Personality信息的会话转移请求。会话转移请求中还包括第二 AN保存的第二 AN与 AT对应的会话信息。
步骤 45: 第三 AN保存从第二 AN转移过来的会话信息后， 确定支持第 二 AN的 Personality信息中所有 Personality类型， 并确定存在一个或多个有 效性判断标识表示相应 Personality类型为无效， 确定关闭与 AT的会话。
第三 AN接收到第二 AN的会话转移请求后， 根据图 3提供的方法判断 是否关闭会话。 由于第三 AN版本高于第二 AN, 在步骤 31中第三 AN确定 支持第二 AN的所有 Personality类型，但在步骤 33中确定 Personality信息中 存在一个或多个有效性判断标识表示相应 Personality类型为无效。 因此， 第 三 AN无法保持这些 personality与 AT间的一致性， 第三 AN确定关闭与 AT 的会话。
高→低→高 AN间激活态硬切换场景下， 低版本的第二 AN保持激活态 向第三 AN发送会话转移请求时， 根据第二 AN与 AT对应的会话信息生成 了第二 AN的 Personality信息。 在 Personality信息中将第二 AN不能保持与 AT 会话一致的 Personality 所对应的有效性判断标识， 被编码为相应 Personality无效。 第三 AN接收到二 AN发送的会话转移请求后， 由于第二 AN的 Personality信息中存在一个或多个有效性判断标识表示相应 Personality 类型为无效， 第三 AN无法保持这些 personality与 AT间的一致性， 第三 AN 确定关闭与 AT的会话， 从而在 AT完成业务后， 第三 AN向 AT发起会话重 建， 从而使第三 AN与 AT的会话保持一致。
图 5 为本发明实施例提供的再一种关闭与接入终端间会话的方法流程 图。 本实施例主要说明低→高→低 AN 间激活态硬切换场景下， 切换后 AN 如何判断是否关闭与 AT间的会话。本实施例中每套 personality的 Personality 类型和每套 Personality对应的有效性判断标识， 分别通过以下两个参数的值 表示： Personality Type和 ValidFlag。其中 , Personality Type表示该套 ersonality 的类型， ValidFlag为有效性判断标识，表示该套 personality是否是完整有效。 ValidFlag为 1表示该套 ersonality有效, ValidFlag为 0表示该套 ersonality 无效。 如图 5所示， 本实施例包括：
步骤 51 : 第一 AN根据第一 AN保存的与 AT对应的会话信息生成第一 AN的 Personality信息 （个性信息）后， 向第二 AN发送携带有 Personality 信息的会话转移请求。
会话转移请求还包括第一 AN与 AT对应的会话信息。 会话转移请求可 以通过 Al 6-Session Transfer Request消息承载。对于低→高→低 AN间激活态 乒乓切换场景， 第一 AN和第三 AN的版本低于第二 AN (中间 AN ) 。 第一 AN和第三 AN可以是同一 AN, 也可以是不同的 AN。
步骤 52：第二 AN保存第一 AN转移过来的会话信息，确定支持 Personality 信息中所有 Personality类型且所有的有效性判断标识均为 1。 即 ValidFlag均 标识相应的 Personality有效。
第二 AN版本高于第一 AN的版本， 由于高版本 AN能向下兼容， 第二 AN可支持第一 AN的所有 PersonalityType。 第二 AN对于低版本的第一 AN 转移过来的会话信息， 能向下兼容支持其中所有 Personality的属性和参数， 不会产生丟失， 各套 personality均完整有效。
第二 AN接收到第一 AN的会话转移请求后， 根据图 3提供的方法判断 是否关闭会话。 由于第二 AN—直保持激活态， 即使第二 AN确定关闭会话， 第二 AN也不会向 AT发送关闭会话消息。
步骤 53: 第二 AN保持激活态向第三 AN切换时， 第二 AN根据保存的 第二 AN与 AT对应的会话信息生成第二 AN的 Personality信息，在 Personality 信息中所有的有效性判断标识均为 1。
由于第二 AN对于低版本的第一 AN转移过来的会话信息， 能向下兼容 其中所有 Personality的属性和参数， 不会产生丟失， 第二 AN可保持第一 AN 转移过来的会话信息中所有 Personality与 AT 的一致性。 因此第二 AN在 A16-Session Transfer Request消息中编码 Personalitylnfo时, 各套 personality 的 ValidFlag均为 1。 步骤 54 : 第二 AN 保持激活态向第三 AN 发送携带有第二 AN 的 Personality信息的会话转移请求。会话转移请求可以通过 A16-Session Transfer Request消息承载； Al 6-Session Transfer Request消息中还包括第二 AN保存 的第二 AN与 AT对应的会话信息。
步骤 55: 第三 AN确定支持 Personality信息中所有 Personality类型 （个 性类型） 、 所有的有效性判断标识均为 1 且第三 AN对于 AT 支持的最高 Personality类型不高于 Personality信息中所有 Personality类型后， 确定不关 闭与 AT的会话。
低→高→低 AN间激活态乒乓硬切换场景下， 第一 AN转移给第二 AN 的会话信息， 在高版本的第二 AN侧没有丟失或改变。 高版本的第二 AN保 持激活态向第三 AN切换时，第二 AN根据第二 AN与 AT对应的会话信息生 成的 Personalitylnfo中所有 ValidFlag均为 1。 第三 AN接收到会话转移请求 后， 根据 Personalitylnfo中所有 ValidFlag可确定第二 AN转移过来的会话信 息中所有 Personality是有效的。
图 6为本发明实施例提供的一种接入网络间切换的方法流程图。 本实施 例主要说明在 AN间硬切换过程中， 目标 AN判断是否关闭与 AT的会话所 处的阶段。 如图 6所示， 本实施例包括：
步骤 61： 源 AN向目标 AN发送包括 Personality信息 （ Personalitylnfo ) 的会话转移请求（例如， A 16-Session Transfer Request消息） 。
步骤 62A: 目标 AN根据 Personality信息 （ Personalitylnfo )判断是否关 闭与 AT的会话。
目标 AN接收到源 AN的 A16-Session Transfer Request消息后， 根据 Personalitylnfo判断是否关闭与 AT的会话， 具体判断流程参见图 3所示。
步骤 62B: 目标 AN 向源 AN发送会话转移响应 （例如， A16-Session Transfer Response消息) .。
步骤 63: 源 AN向目的 AN发送会话转移完成响应 （例如， A16-Session Transfer Complete消息 ) 。
步骤 64: 目的 AN为 AT提供服务。
步骤 65:目标 AN向源 AN发送会话释放指示（例如， A16-Session Release Indication消息 ) 。
步骤 66:源 AN向目的 AN发送会话释放响应（例如， A16-Session Release
Indication ACK消息 ) 。
步骤 67: 目标 AN完成业务后， 关闭目标 AN与 AT之间的连接（例如， Connection between AT and Target AN Closes ) 。
步骤 68:目标 AN向源 AN发送资源释放请求（例如， A13-Resource Release Request消息） 。
步骤 69: 在步骤 62A中目标 AN确定关闭与 AT的会话时， 目标 AN向 AT发送会话关闭消息 （例如， Session Close消息） 。
步骤 610: 源 AN向目的 AN发送资源释放响应 （例如， A13-Resource Release Response消息 ) 。
之后， 目标 AN与 AT间的会话建立。
本发明实施例在源 AN向目标 AN发送 A16-Session Transfer Request消息 后， 目标 AN根据其中的 Personalitylnfo判决在在 AT完成业务后是否向 AT 发送 Session Close消息进行会话重建以保持与 AT间的会话一致性。
图 7A为本发明实施例提供的一种源接入网络设备结构示意图。 如图 7A 所示， 发明实施例提供的源接入网络设备包括：
生成模块 71 , 用于接入终端从源接入网络向目标接入网络切换过程中， 根据所述源接入网络保存的与所述接入终端对应的会话信息， 生成所述源接 入网络侧的 Personality信息； 所述 Personality信息包括所述会话信息中各套 Personality的 Personality类型和各套 Personality分别对应的有效性判断标识； 各套 Personality分别对应的有效性判断标识用于标识该套 Personality无效或 有效。 会话转移请求发送模块 72, 用于所述源接入网络向目标接入网络发送包 括有生成模块 71生成的 Personality信息的会话转移请求，以使所述目标接入 网络根据所述 Personality信息判断在所述接入终端完成业务后是否关闭与所 述接入终端的会话。
进一步， 如图 7B所示， 生成模块 71包括： 类型确定单元 711和有效性 编码单元 712。
类型确定单元 711 , 用于确定所述会话信息中各套 Personality 的 Personality类型。
有效性编码单元 712, 用于根据对所述源接入网络保存的与接入终端对 应的会话信息各套 Personality的保存完整性和发送完整性， 或根据对所述源 接入网络保存的与接入终端对应的会话信息各套 Personality的发送完整性， 判断所述会话信息中各套 Personality的有效性并生成有效性判断标识。
具体地， 根据对所述会话信息各套 Personality的保存完整性和发送完整 性，判断所述会话信息中各套 Personality的有效性并生成有效性判断标识时： 有效性编码单元 712具体用于在所述会话信息中一套 Personality保存不完整 或发送不完整时， 确定该套 Personality无效， 并生成标识该套 Personality无 效的有效性判断标识； 在所述会话信息中的一套 Personality保存完整且发送 完整时， 确定该套 Personality有效， 并生成标识该套 Personality有效的效性 判断标识； 通过上述方法判断所述会话信息中每一套 Personality的有效性， 并为每一套 Personality生成标识该套 Personality有效的有效性判断标识。
具体地， 根据对所述会话信息各套 Personality的发送完整性， 判断所述 会话信息中各套 Personality的有效性并生成有效性判断标识时： 有效性编码 单元 712具体用于在所述会话信息中一套 Personality发送不完整时， 确定该 套 Personality无效， 并生成标识该套 Personality无效的有效性判断标识； 在 所述会话信息中的一套 Personality发送完整时， 确定该套 Personality有效， 并生成标识该套 Personality有效的效性判断标识； 通过上述方法判断所述会 话信息中每一套 Personality的有效性， 并为每一套 Personality生成标识该套 Personality有效的效性判断标识。
本发明实施例提供的源接入网络，会话转移请求发送模块 72在发送给目 标 AN的会话转移请求中， 添加了本端保存的与 AT对应的会话信息中各套 Personality的 Personality类型和各套 Personality的有效性判断标识。 会话转 移请求中各套 Personality的 Personality类型反映了源 AN与该 AT会话时采 用的 Personality类型， 若目标 AN不支持这些 Personality类型， 则目标 AN 无法与 AT保持会话一致性。 会话转移请求中各套 Personality的有效性判断 标识， 反映了源 AN对于该 AT保存的各套 Personality的有效性， 若源 AN 保存的 Personality无效， 则目标 AN无法保持该套 Personality与 AT的一致 性。
图 8A为本发明实施例提供的一种目标接入网络设备结构示意图。 如图 8A所示， 发明实施例提供的目标接入网络设备包括： 会话转移请求接收模块 81、 会话关闭判断模块 82和关闭消息发送模块 83。
会话转移请求接收模块 81 , 用于接收源接入网络发送的包括有
Personality信息的会话转移请求； 所述 Personality信息包括所述源接入网络 保存与接入终端对应的会话信息中各套 Personality的 Personality类型和各套 Personality分别对应的有效性判断标识。
会话关闭判断模块 82, 用于根据会话转移请求接收模块 81 接收到的 Personality信息判断是否关闭与接入终端的会话。
具体地， 会话关闭判断模块 82 具体用于若所述目标接入网络支持所述 Personality信息中所有 Personality类型且所述 Personality信息中所有有效性 判断标识均标识相应 Personality有效、 且所述目标接入网络对于所述接入终 端支持的最高 Personality类型不高于所述 Personality信息中所有 Personality 类型， 确定不关闭与所述接入终端的会话， 否则确定关闭与所述接入终端的 会话。 关闭消息发送模块 83 , 用于会话关闭判断模块 82根据 Personality信息 确定关闭与接入终端的会话时， 在所述接入终端完成业务后， 向所述接入终 端发送会话关闭消息。
进一步， 如图 8B所示， 会话关闭判断模块 82包括： 第一支持判断单元 821、有效性判断单元 822、 第二支持判断单元 823和会话关闭确定单元 824。
第一支持判断单元 821 , 用于判断所述 Personality信息中是否存在目标 接入网络不支持的 Personality类型。
有效性判断单元 822, 用于若第一支持判断单元 821确定不存在所述目 标接入网络不支持的 Personality类型， 判断所述 Personality信息中所有有效 性判断标识是否均表示相应 Personality有效。
第二支持判断单元 823 , 用于若有效性判断单元 822确定所有有效性判 断标识均表示相应 Personality为有效，根据所述接入终端支持的应用子类型， 目标接入网络判断对于所述接入终端所述目标接入网络支持的最高 Personality类型是否高于 Personality信息中所有 Personality类型。
会话关闭确定单元 824, 用于若第一支持判断单元 821确定存在所述目 标接入网络不支持的 Personality类型， 确定关闭与所述接入终端的会话； 若 第一支持判断单元 821 确定所有有效性判断标识中存在一个或多个 Personality有效性判断标识表示相应 Personality无效， 确定关闭与所述接入 终端的会话； 若第二支持判断单元 823确定目标接入网络对于所述接入终端 支持的最高 Personality类型高于 Personality信息中所有 Personality类型， 确 定关闭与接入终端的会话。
本发明实施例提供的目标接入网络，会话关闭判断模块 82根据会话转移 请求中的 Personality信息， 判断目标 AN能否与 AT间的会话保持一致， 从 而确定是否关闭与 AT的会话。 避免了目标 AN由于依据的信息不充分产生 的误判。 因此， 本发明实施例解决了 AN间切换过程中目标 AN判断是否关 闭会话时所依据的信息不足、 判断方法不完善的缺陷， 避免了目标 AN误判 现象的发生， 可避免业务异常， 也可节省带宽， 并可提高用户体验。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修改， 或 者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求
1、 一种关闭与接入终端间会话的方法， 其特征在于， 包括：
接入终端从源接入网络向目标接入网络切换过程中，所述源接入网络根据 所述源接入网络保存的与所述接入终端对应的会话信息， 生成源接入网络侧 的 Personality信息；所述 Personality信息包括所述会话信息中各套 Personality 的 Personality类型和各套 Personality分别对应的有效性判断标识； 各套
Personality分别对应的有效性判断标识用于标识该套 Personality无效或有效； 所述源接入网络向所述目标接入网络发送包括有所述 Personality信息的 会话转移请求， 以使所述目标接入网络根据所述 Personality信息判断在所述 接入终端完成业务后是否关闭与所述接入终端的会话， 当确定关闭与接入终 端的会话时， 在所述接入终端完成业务后， 向所述接入终端发送会话关闭消 自
2、 根据权利要求 1所述方法， 其特征在于， 所述根据所述源接入网络保 存的与所述接入终端对应的会话信息， 生成所述源接入网络侧的 Personality 信息， 包括：
所述源接入网络确定所述会话信息中各套 Personality的 Personality类型； 所述源接入网络根据对所述会话信息中各套 Personality的保存完整性和 发送完整性， 或所述源接入网络根据对所述会话信息中各套 Personality的发 送完整性， 判断所述会话信息中各套 Personality的有效性并生成有效性判断 标识。
3、 根据权利要求 2所述方法， 其特征在于， 所述根据对所述会话信息各 套 Personality的保存完整性和发送完整性， 判断所述会话信息中各套
Personality的有效性并生成有效性判断标识， 包括：
在所述会话信息中一套 Personality保存不完整或发送不完整时，确定该套 Personality无效， 并生成标识该套 Personality无效的有效性判断标识；
在所述会话信息中的一套 Personality保存完整且发送完整时， 确定该套 Personality有效 , 并生成标识该套 Personality有效的效性判断标识； 通过上述方法判断所述会话信息中每一套 Personality的有效性，并为每一 套 Personality生成标识该套 Personality有效的效性判断标识。
4、 根据权利要求 2所述方法， 其特征在于， 所述源接入网络根据对所述 会话信息中各套 Personality的发送完整性， 判断所述会话信息中各套
Personality的有效性并生成有效性判断标识， 包括：
在所述会话信息中一套 Personality发送不完整时，确定该套 Personality无 效， 并生成标识该套 Personality无效的有效性判断标识；
在所述会话信息中的一套 Personality发送完整时，确定该套 Personality有 效， 并生成标识该套 Personality有效的效性判断标识；
通过上述方法判断所述会话信息中每一套 Personality的有效性，并为每一 套 Personality生成标识该套 Personality有效的效性判断标识。
5、 一种关闭与接入终端间会话的方法， 其特征在于， 包括：
目标接入网络接收源接入网络发送的包括有 Personality信息的会话转移 请求； 所述 Personality信息包括所述源接入网络保存的与接入终端对应的会 话信息中各套 Personality的 Personality类型和各套 Personality分别对应的有 效性判断标识；
目标接入网络根据所述 Personality信息判断是否关闭与接入终端的会话； 所述目标接入网络根据 Personality信息确定关闭与接入终端的会话时，在 所述接入终端完成业务后， 向所述接入终端发送会话关闭消息。
6、 根据权利要求 5所述的方法， 其特征在于， 所述目标接入网络所述根 据所述 Personality信息判断是否关闭与接入终端的会话包括：
若所述目标接入网络支持所述 Personality信息中所有 Personality类型且所 述目标接入网络对于所述接入终端支持的最高 Personality类型不高于所述 Personality信息中所有 Personality类型， 确定不关闭与所述接入终端的会话， 否则确定关闭与所述接入终端的会话。
7、 根据权利要求 5所述的方法， 其特征在于， 所述目标接入网络所述根 据所述 Personality信息判断是否关闭与接入终端的会话包括：
判断所述 Personality信息中是否存在目标接入网络不支持的 Personality类 型；
若存在所述目标接入网络不支持的 Personality类型，确定关闭与所述接入 终端的会话；
若不存在所述目标接入网络不支持的 Personality类型， 判断所述
Personality信息中所有有效性判断标识是否均表示相应 Personality有效； 若所有有效性判断标识中存在一个或多个 Personality有效性判断标识表 示相应 Personality无效， 确定关闭与所述接入终端的会话；
若所有有效性判断标识均表示相应 Personality为有效，根据所述接入终端 支持的应用子类型， 目标接入网络判断对于所述接入终端所述目标接入网络 支持的最高 Personality类型是否高于 Personality信息中所有 Personality类型； 若所述目标接入网络对于所述接入终端支持的最高 Personality类型高于 Personality信息中所有 Personality类型， 确定关闭与接入终端的会话。
8、 一种源接入网络设备， 其特征在于， 包括：
生成模块， 用于接入终端从源接入网络向目标接入网络切换过程中， 根据 所述源接入网络保存的与所述接入终端对应的会话信息， 生成源接入网络侧 的 Personality信息；所述 Personality信息包括所述会话信息中各套 Personality 的 Personality类型和各套 Personality分别对应的有效性判断标识； 各套
Personality分别对应的有效性判断标识用于标识该套 Personality无效或有效； 会话转移请求发送模块， 用于向目标接入网络发送包括有所述 Personality 信息的会话转移请求， 以使所述目标接入网络根据所述 Personality信息判断 在所述接入终端完成业务后是否关闭与所述接入终端的会话。
9、 根据权利要求 8所述设备， 其特征在于， 所述生成模块包括： 类型确定单元，用于确定所述会话信息中各套 Personality的 Personality类 型；
有效性编码单元，用于根据对所述会话信息各套 Personality的保存完整性 和发送完整性， 或根据对所述会话信息中各套 Personality的发送完整性， 判 断所述会话信息中各套 Personality的有效性并生成有效性判断标识。
10、 根据权利要求 9所述设备， 其特征在于， 所述有效性编码单元具体用 于在所述会话信息中一套 Personality保存不完整或发送不完整时， 确定该套 Personality无效， 并生成标识该套 Personality无效的有效性判断标识； 在所 述会话信息中的一套 Personality保存完整且发送完整时，确定该套 Personality 有效， 并生成标识该套 Personality有效的效性判断标识； 通过上述方法判断 所述会话信息中每一套 Personality的有效性， 并为每一套 Personality生成标 识该套 Personality有效的效性判断标识。
11、 根据权利要求 9所述设备， 其特征在于， 所述有效性编码单元具体用 于在所述会话信息中一套 Personality发送不完整时， 确定该套 Personality无 效， 并生成标识该套 Personality无效的有效性判断标识； 在所述会话信息中 的一套 Personality发送完整时， 确定该套 Personality有效， 并生成标识该套 Personality有效的效性判断标识； 通过上述方法判断所述会话信息中每一套 Personality的有效性 , 并为每一套 Personality生成标 i只该套 Personality有效 的效性判断标识。
12、 一种目标接入网络设备， 其特征在于， 包括：
会话转移请求接收模块，用于接收源接入网络发送的包括有 Personality信 息的会话转移请求； 所述 Personality信息包括所述源接入网络保存的与接入 终端对应的会话信息中各套 Personality的 Personality类型和各套 Personality 分别对应的有效性判断标识；
会话关闭判断模块，用于根据所述 Personality信息判断是否关闭与接入终 端的会话；
关闭消息发送模块，用于根据 Personality信息确定关闭与接入终端的会话 时， 在所述接入终端完成业务后， 向所述接入终端发送会话关闭消息。
13、 根据权利要求 12所述设备， 其特征在于， 所述会话关闭判断模块具 体用于若所述目标接入网络支持所述 Personality信息中所有 Personality类型 且所述 Personality信息中所有有效性判断标识均标识相应 Personality有效、 且所述目标接入网络对于所述接入终端支持的最高 Personality类型不高于所 述 Personality信息中所有 Personality类型， 确定不关闭与所述接入终端的会 话， 否则确定关闭与所述接入终端的会话。
14、 根据权利要求 13所述设备， 其特征在于， 所述会话关闭判断模块包 括：
第一支持判断单元，用于判断所述 Personality信息中是否存在目标接入网 络不支持的 Personality类型；
有效性判断单元，用于若不存在所述目标接入网络不支持的 Personality类 型， 判断所述 Personality信息中所有有效性判断标识是否均表示相应
Personality有效；
第二支持判断单元，用于若所有有效性判断标识均表示相应 Personality为 有效， 根据所述接入终端支持的应用子类型， 目标接入网络判断对于所述接 入终端所述目标接入网络支持的最高 Personality类型是否高于 Personality信 息中所有 Personality类型；
会话关闭确定单元，用于若存在所述目标接入网络不支持的 Personality类 型， 确定关闭与所述接入终端的会话； 若所有有效性判断标识中存在一个或 多个 Personality有效性判断标识表示相应 Personality无效， 确定关闭与所述 接入终端的会话； 若所述目标接入网络对于所述接入终端支持的最高
Personality类型高于 Personality信息中所有 Personality类型， 确定关闭与接 入终端的会话。
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