WO2008077315A1 - Method, apparatus and communication system for making information interaction during media independent handover - Google Patents

Abstract

A method for making information interaction during a media independent handover comprises: a user terminal obtaining its information related to the handover and sending the information related to the handover to a target node during the user terminal performing the media independent handover between a source node and the target node, the target node notifying the source node to keep or/and release network resource of the user terminal according to the information related to handover. The problem is resolved that among the user terminal, the source node and the target node handover state information can not be made interaction in the prior art so that to influence a full handover flow normally running. At the same time, the present invention also discloses a terminal, communication apparatus for making information interaction during the media independent handover and a communication system thereof.

Description

 Method, device and communication system for information interaction in media independent switching process

 The present invention relates to the field of communications, and in particular to techniques for information interaction in media independent handover. Background technique

 Under the existing wireless communication technology, mobile users cannot perform roaming and handover under different radio access technologies, in order to solve mobile users in heterogeneous networks (including IEEE802.3,

The seamless handover between IEEE802.il, IEEE802.16 and other 802 networks and cellular networks such as 3GPP and 3GPP2. The IEEE 802 Wireless Working Group established the IEEE 802.21 working group to develop a common handover framework for wired and wireless IEEE. The 802 standard (such as IEEE 802.3/802.11/802.16) and the 3G standard, the requirements for switching between different standards and the corresponding switching mechanism. Supporting switching between different media types to enhance the user's experience with mobile devices, the goal is to ultimately enable mobile devices to automatically select the best network connection type and seamlessly switch the voice channel when roaming between networks without user intervention. Generally speaking, terminals and networks, such as base stations and Point of Attachment (PoA), may be multi-mode, that is, support different wireless standards, and sometimes voice and data transmission can be simultaneously performed on multiple interfaces. Today's mobile communication networks have evolved into micro-cellular (IEEE 802.11) and macro-cellular (3GPP, 3GPP2, IEEE 802.16), which may cross-overlap each other, and handover may occur between different types of networks. In order to achieve the seamlessness and continuity of this handover, the IEEE 802.21 working group introduced a new protocol functional layer - Media Independent Handover Function (MIHF) module in the existing mobility management protocol stack. The location and key services of the MIHF module in the mobility management protocol stack are shown in Figure 1. The HF module is logically defined as a thin layer in the mobility management protocol stack of the terminal and the network, which plays a role in the handover decision process. Help function; For multi-mode terminals, the MIHF module provides some necessary information for the upper layer to make handover decisions and how to effectively make handover decisions. The upper layer is based on The MIHF module's input and context make switching decisions and link selection for seamless switching. The MIHF module provides the following services to help the user's switching process:

 Media Independent Event Service (MIES): provides classification, filtering, and reporting of dynamically changing events related to link characteristics, link status, and link quality;

 Media Independent Command Service (MICS): Provides means for MIH users to manage and control link behavior related to handover and mobility;

 Media Independent Information Service (MIIS): Provides detailed information on the characteristics and services of the service network and surrounding networks for effective system access and handover decisions.

 Referring to FIG. 1 and FIG. 2, the user terminal in the communication system and the network elements on the network side include a Media Independent Handover (MIH) user module and an MHF module, and the MIH user module belongs to Layer 3 (L3). Mobility management and application protocols, including mobile Internet Protocol (MIPv4/v6) and Session Initiated Protocol (SIP) mobility management protocols and handover strategies, transmission and applications, etc., MHF module It is: A media-independent switching protocol layer that provides media-independent event services, media-independent command services, and media-independent information services. The MIH user module and the local MIHF module exchange information through the MIH primitives (including the handover completion request primitive, the handover completion indication primitive, the handover completion response primitive, and the handover completion determination primitive), and the local HF module The information exchange is performed with the remote peer-to-peer MIHF module through H messages (including a handover completion request message and a handover completion response message).

In the process of the user terminal switching from the source node (such as the source network) to the target node (such as the target network), when the handover is completed, the user terminal needs to send a handover complete request message indicating that the handover operation is completed to the target node, and The target node notifies the corresponding source node to release the network resource about the user terminal, and the handover completion request message is generated by the MIHF module on the user terminal according to the handover completion request primitive delivered by the local MIH user module. The target node cannot notify the corresponding source node to release or/and maintain the network resource of the user terminal, so that the bearer burden of the source node will be caused; on the other hand, the source node cannot use the resource for indicating the processing result. Status information is sent to the target node, so that the target node cannot notify the corresponding user terminal how to Continue the corresponding network session, which affects the normal progress of the entire switching process, which in turn affects the user experience. In addition, the mechanism defined in the current standard can only deal with the case where the terminal only has a single session switch, and it is not applicable to the case where the user terminal has multiple sessions switching at the same time. Summary of the invention

 Embodiments of the present invention provide methods, apparatus, and corresponding media independent switching systems for transmitting status information in a media independent handover procedure.

 The technical solutions provided by the specific embodiments of the present invention are as follows:

 A method for transmitting status information during a media independent handover process, including:

 During the media-independent handover between the source node and the target node, the user terminal acquires its own handover-related information and sends the handover-related information to the target node, and the target node performs the handover according to the handover. The related information informs the source node to maintain or/and release the network resources of the user terminal.

 A user terminal, comprising:

 a module for performing media independent handover on a single session or multiple sessions of the user terminal; a module for acquiring handover related information of the user terminal in the process of media independent handover; and transmitting the handover related information to the user A module of a communication device to which the terminal belongs after switching the session.

 A communication device comprising:

 a module for receiving handover related information sent by a user terminal;

 And means for notifying the communication device to which the user terminal belongs before the handover session releases or/and maintains the corresponding network resource according to the handover state information.

 A communication device comprising:

 a module for receiving handover related information sent by a communication device to which a user terminal belongs after switching a session;

 A module for releasing or/and maintaining a corresponding network resource based on the handover related information.

A communication system comprising: a user terminal, configured to establish a connection with a corresponding communication device to complete data communication; a plurality of communication devices, configured to access the user terminal into the network, wherein when the user terminal is between any two communication devices When the medium is not switched, the user terminal acquires its own handover related information, and sends the handover related information to the target communication device, and the target communication device notifies the source communication device to maintain or/and release the user terminal according to the handover related information. Internet resources.

 The beneficial effects of the specific embodiments of the present invention are as follows:

 In the present invention, when the user terminal performs media independent handover between the source node and the target node, the user terminal acquires its own handover related information, and sends the handover related information to the target node, and then the handover is performed by the target node. The related information is transmitted to the corresponding source node, so that the interaction between the user terminal, the target node and the source node can be performed, so that the entire handover process is ensured, thereby ensuring the quality of the user's call and improving. The user experience. DRAWINGS

 1 is a positional relationship diagram of a MIH user module and a MIHF module in a mobility management protocol stack in the prior art;

 2 is a schematic diagram of information interaction between a MIHF module and a local MIH user module, and between the MIHF module and the opposite MIHF module in the prior art;

 3 is a block diagram of a medium independent switching system according to an embodiment of the present invention;

 FIG. 4 is a flowchart of a process of transmitting a self-switching related information in a process of performing a media independent handover in a user terminal according to an example of the present invention. detailed description

In this embodiment, the user terminal acquires its own handover related information in the process of performing media independent handover between the source node and the target node, and transmits the handover related information to the target node, according to the target node. The handover related information informs the source node to release or/and maintain the network resources of the user terminal. The handover related information includes handover state information of the user terminal (eg, cutting Switching failure, handover success, or handover rejection, etc., or including handover status information of the user terminal and corresponding processing requests (such as releasing network resources or maintaining network resources, etc.).

 The user terminal transmits handover related information to the target node in two cases:

 In the first case, the user terminal switches the single session from the source node to the target node, and the user terminal adds the handover related information for the single session in the local handover complete request primitive, and generates the primitive according to the handover completion request. A corresponding handover complete request message is transmitted by the handover complete request message to the target node.

 In the second case, the user terminal switches multiple sessions from the source node to the target node, and the user terminal adds handover related information for each session in the local handover complete request primitive, and according to the handover completion request, The corresponding handover completion request message is generated, and the handover related information is transmitted to the target node by the handover completion request message.

 The following is an example of transmitting handover related information when switching a single session and transmitting handover related information when switching multiple sessions, and will be described in detail with reference to the accompanying drawings.

 Referring to FIG. 3, in this embodiment, the communication system includes a user terminal, configured to establish a connection with a corresponding communication device, to complete data communication, and a plurality of communication devices, configured to connect the user terminal to the network, where When the user terminal performs media independent handover between any two communication devices, the user terminal acquires its own handover related information, and transmits the handover related information to the target communication device, and the target communication device is related according to the handover. The information notifying source communication device maintains or/and releases the network resources of the user terminal.

 The user terminal includes a module for performing media independent handover on a single session or multiple sessions of the user terminal, a module for acquiring handover related information of the user terminal in the process of media independent handover, and the foregoing The information is transmitted to the module of the communication device to which the user terminal belongs after switching the session. In a specific embodiment of the present invention, modules in a terminal or other device may exist independently, or multiple modules may exist on one entity.

The communication device as the target node may include: means for receiving handover related information sent by the user terminal; and configured to notify the user terminal to release or/and maintain the communication device to which the user terminal belongs before switching the session according to the handover related information The corresponding network resource module. The communication device as the source node may include: a module for receiving handover related information sent by the communication device to which the user terminal belongs after the handover session; and configured to release or/and maintain the corresponding network resource according to the handover related information. Module.

 In the present embodiment, the communication system may specifically include the user terminal 20, the source node 21, and the target node 22. The user terminal 20 is configured to establish a connection with the target node 22 to complete data communication; the source node 21 and the target node 22 are used to access the user terminal 20 into the network, and when the user terminal 20 is at the source node 21 and When media-independent switching is performed between the target nodes, the interaction between the related information and the processing result is performed with the user terminal 20 to ensure the normal handover process.

 The user terminal 20 may include an MIH User Module 200 and a MIHF Module 201. The MIH user module 200 is configured to perform media independent handover on the network session of the user terminal 20, acquire handover related information of the user terminal 20 in the handover process, and add the handover related information to the handover completion request primitive and The primitive is sent to the MIHF module 201. The MIHF module 201 is configured to generate a corresponding handover complete request message according to the handover complete request primitive, and transmit the handover related information to the target node 22 through the message, and receive The corresponding processing result of the source node 21 returned by the target node 22.

 The target node 22 includes a MH module 220 and a MIHF module 221. The MIHF module 221 is configured to receive a handover complete request message sent by the user terminal 20, and transmit the handover related information carried in the message to the source node 21, and receive the corresponding processing result returned by the source node 21, and process the processing. The result is transmitted to the user terminal 20; the MH user module 220 is configured to instruct the MIHF module 221 to transmit the handover related information of the user terminal 20 to the source node 21, or instruct the MIHF module 221 to send the corresponding processing result of the source node 21 to the user. Terminal 20.

The source node 21 includes an H user module 210 and an MIHF module 211. The MIHF module 211 is configured to receive the handover related information sent by the target node, and transmit the information to the H user module 210, and receive the handover completion response primitive that is returned by the MIH user module 210, and generate a corresponding handover. Completing the response message, and transmitting the message to the target node 22; the MIH user module 210 is configured to perform corresponding release or/and maintenance processing on the network resource of the user terminal 20 according to the handover related information sent by the target node 22, and process Get the corresponding processing after the end As a result, the processing result is added to the corresponding handover completion response primitive and sent to the MIHF module 211.

 Based on the above system block diagram, in the embodiment, when the user terminal 20 performs media independent handover between the source node 21 and the target node 22, the handover procedure may be triggered by the user terminal 20 or triggered by the source node 21. As shown in FIG. 4, taking the media-independent handover procedure triggered by the user terminal 20 as an example, first, the source node 21' receives the media-independent handover candidate network query request message sent by the user terminal 20 (eg, MIH_MN_HO_Candidate). After the Query Request, the media-independent handover query resource request message (eg, MH-N2N-HO_Quer_Resource Request) is sent to the target node 22, and the media-independent handover query resource response message returned by the target node 22 is received (eg, After the MIH-N2N-H0-Queiy-Professional Response, the media-independent handover candidate network query response message (for example, MIH_MN_HO_Candidate_Query Response) is returned to the user terminal 20. Then, the user terminal 20 sends a media-independent handover submission request message (for example, MIH_MN_HO_Candidate_Commit Request) to the source node 21, and forwards the media-independent handover submission request message (for example, MIH_Net_Ho_Candidate_Commit Request) to the target node through the source node, and the target node After receiving the request message, the device 22 returns a media-independent handover submission response message (for example, MIH_Net_HO_Candidate_Commit Response) to the source node 21, and forwards the media-independent handover submission response to the user terminal 20 through the source node 21. A message (e.g., MIH_MN_HO_Candidate_Commit Response), then the user terminal 20 begins media independent switching from the source node 21 to the target node 22.

 When the media-independent handover is completed, the user terminal 20 sends a handover complete request message (for example, MIH_MN_HO_Complete Request) to the target node 22 to trigger the handover completion process. In this embodiment, the user terminal 20 ends when the handover is completed. In the flow, its own switching state information is transmitted to the target node 22, thereby notifying the target node 22 of the result of the handover.

 Referring to FIG. 5, in the above first case, the detailed flow of the user terminal 20 transmitting the relevant information to the target node 22 is as follows:

Step 300: The MH user module 200 in the user terminal 20 acquires local handover related information. 0 and add the switch related information to the switch completion request primitive (eg:

In MIH_MN_HO_Complete.request), the handover completion request primitive is sent to the MIHF module 201.

 Step 301: The MIHF module 201 generates a corresponding handover complete request message (eg, MIH_MN_HO_Complete Request) according to the handover complete request primitive, and sends the message to the MIHF module 221 in the target node 22; The completion request message carries the handover related information of the user terminal 20.

 Step 302: The MIHF module 221 sends a handover completion indication primitive (such as MIH_MN_HO_Complete.indication) carrying the handover related information to the local MIH user module 220.

 Step 303: The H subscriber module 220 sends a handover complete request primitive (e.g., MIH - N2N - HO - Complete.request) to the MIHF module 221, instructing it to send the handover related information to the source node 21.

 Step 304: The MIHF module 221 sends a handover completion request message (for example, H-N2N-HO_complete Request) to the MIHF module 211 in the source node 21, where the message carries the handover related information of the user terminal 20.

 Step 305: The MIHF module 211 sends a handover completion indication primitive (for example, MIH-N2N_HO_Complete.indication) carrying the handover related information to the local MIH user module 210.

 Step 306: The MIH user module 210 releases or maintains the network resource of the local user terminal 20 according to the obtained handover related information, and adds the processing result (that is, whether the network resource corresponding to the single session is released or maintained) in the handover. The completion response primitive (eg, MIH_N2N_HO_Complete.response) is sent to the MIHF module 211.

 Step 307: The MIHF module 211 generates a corresponding handover complete response message (eg, MIH_N2N_HO_Complete Response) according to the handover completion response primitive, and sends the message to the MIHF module 221 in the target node 22; The completion response message carries the processing result of the source node 21.

Step 308: The MIHF module 221 sends a handover completion confirmation primitive (such as MIH_N2N_HO_Complete.confirm) carrying the processing result to the local MIH user module 220. Step 309: The MIH user module 220 returns a handover complete response primitive (eg, MIH_MN_HO_Complete.respoftse) to the MIHF module 221, instructing it to send the processing result to the user terminal 20.

 Step 310: The MIHF module 221 sends a handover complete response message (for example, MIH_MN_HO_Complete Response) to the MIHF module 201 in the user terminal 20, and the message carries the processing result of the source node 21.

 Step 311: The MIHF module 201 sends a handover completion confirmation primitive (such as MIH_MN_HO_Complete.confirm) carrying the processing result to the local MIH user module 200.

 At this point, the user terminal 20 has obtained the processing result of the source node 21 for the corresponding network resource, the handover process is officially ended, and the user terminal 20 can continue the subsequent network session. '

 On the other hand, in the second case described above, since the user terminal 20 switches the multi-session to the target node 22, the user terminal 20 adds the handover related information of each session in its own handover completion request primitive, and then Generating a corresponding handover complete request message according to the handover complete request primitive, and transmitting the handover related information of each session to the target node 22 by using the handover complete request message.

 After receiving the handover complete request message, the target node 22 notifies the source node 21 to perform corresponding processing on the network resources of the user terminal 20. The source node 21 releases or maintains the network resources corresponding to each session according to the received handover related information of each session.

 After performing the release or maintenance operation, the source node 21 adds the processing result of each session (including which network resources of the session are released, and which network resources of the session are maintained) in the local handover completion response primitive, and then according to The handover completion response primitive generates a corresponding handover completion response message, and transmits the processing result to the target node 22 through the handover completion response message.

 After receiving the handover completion response message, the target node 22 notifies the user terminal 20 of the processing result of the network resource by the source node 21, and the user terminal 20 performs subsequent processing according to the processing result.

Of course, in the media-independent switching system, the corresponding message type can also be newly defined to transmit the handover related information of the user terminal 20 or/and the processing result of the source node 21, which does not affect the implementation effect of the embodiment. In a specific implementation manner of the present invention, when the user terminal performs media independent handover between the source node and the target node, the user terminal acquires its own handover related information, and sends the handover related information to the target node, and then the target node Transmitting the handover related information to the corresponding source node, so that the interaction between the user terminal, the target node, and the source node can be performed, so that the entire handover process is ensured, thereby ensuring the user's The quality of the call improves the user experience.

 It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and variations of the invention as claimed.

Claims

Rights request  A method for information interaction in a medium-independent handover process, wherein a user terminal acquires its own handover related information in a process of performing media independent handover between a source node and a target node, and The handover related information is sent to the target node, and the target node notifies the source node to maintain or/and release the network resource of the user terminal according to the handover related information.  2. The method according to claim 1, wherein the handover related information comprises handover state information of the user terminal; or comprises handover state information of the user terminal and a corresponding processing request.  3. The method according to claim 2, wherein if the user terminal performs media independent handover on a single session, the user terminal acquires handover related information of the single session, and sends the handover related information to a target node, the target node notifying the source node to release or maintain the network resource of the user terminal according to the handover related information.  The method according to claim 3, wherein the user terminal carries handover related information of the single session in a corresponding handover completion request primitive, and generates a corresponding according to the handover completion request primitive. Switching the completion request message, and transmitting the handover related information to the target node by the handover completion request message.  The method according to claim 2, wherein if the user terminal performs media independent handover on multiple sessions, the user terminal acquires handover related information of each session, and sends the handover related information to The target node, the target node notifies the source node to release or maintain the network resource corresponding to each session according to the handover related information.  The method of claim 5, wherein the user terminal carries the handover related information of each session in a corresponding handover completion request primitive, and generates a corresponding according to the handover completion request primitive. The handover completion request message, and transmitting the handover related information to the target node by the handover completion request message. The method according to any one of claims 1 to 6, wherein after the source node completes the resource release or/and the resource maintenance operation, the corresponding processing result is sent to the target node, and the target node according to the The processing result notifies the user terminal to continue the network session after the handover. The method according to claim 7, wherein after the source node completes the operation of releasing or/and maintaining the network resource, the processing result is added in the corresponding handover completion response primitive, and the root: The handover completion response primitive generates a corresponding handover completion response message, and transmits the processing result to the target node by using the handover completion response message.  9. A user terminal, comprising:  a module for performing media independent handover on a single session or multiple sessions of the user terminal; a module for acquiring handover related information of the user terminal in the process of media independent handover; and transmitting the handover related information to the user A module of a communication device to which the terminal belongs after switching the session.  The user terminal according to claim 9, further comprising:  a module for carrying handover related information of a single session in a corresponding handover completion request primitive, or a module for carrying handover related information of each session in a plurality of sessions in a corresponding handover completion request primitive;  A module for generating a corresponding handover completion request message according to the handover completion request primitive.  A communication device, comprising:  a module for receiving handover related information sent by a user terminal;  And means for notifying the communication device to which the user terminal belongs before the handover session releases or/and maintains the corresponding network resource according to the handover related information.  12. The communication device of claim 11, further comprising:  Means for receiving a processing result sent by the communication device to which the user terminal belongs before switching the session;  And a module for notifying the user terminal to perform the switched network session according to the processing result.  13. A communication device, comprising:  a module for receiving handover related information sent by a communication device to which a user terminal belongs after switching a session; A module for releasing or/and maintaining a corresponding network resource based on the handover related information. 14. The communication apparatus according to claim 13, further comprising: means for acquiring a corresponding processing result after the releasing or/and maintaining operation is completed; for adding the processing result to the corresponding And a module in the handover completion response primitive; configured to generate a corresponding handover completion response message according to the handover completion response primitive, and transmit the handover completion response message to a module of the communication device to which the user terminal belongs after the handover session.  15. A communication system, comprising:  a user terminal, configured to establish a connection with a corresponding communication device to complete data communication; a plurality of communication devices, configured to access the user terminal into the network, wherein when the user terminal is between any two communication devices When the medium is not switched, the user terminal acquires its own handover related information, and sends the handover related information to the target communication device, and the target communication device notifies the source communication device to maintain or/and release the user terminal according to the handover related information. Internet resources.  The communication system according to claim 15, wherein if the user terminal performs media independent handover on a single session, the user terminal transmits handover related information for the single session to the target communication device, where The target communication device notifies the source communication device to release or maintain all network resources of the user terminal according to the handover related information.  The communication system according to claim 15, wherein if the user terminal performs media independent handover on a plurality of sessions, the user terminal transmits handover related information for each session to the target communication device, where The target communication device notifies the source communication device to release or maintain the network resource corresponding to each session according to the handover related information.