WO2013053330A1 - Stream migration method and apparatus - Google Patents

Abstract

The present invention provides a stream migration method and apparatus. The method comprises: a local mobility anchor (LMA) obtaining information of states of a terminal in various access networks respectively; the LMA selecting one of the various access networks according to the state information; and the LMA initiating stream migration. The present invention solves the problem of incapability of the LMA in perceiving a connection state of the terminal incurred by that stream migration is always initiated at the terminal side, and therefore the LMA obtains information of states of the terminal in various access networks, thereby ensuring that the LMA is capable of correctly selecting an access network to initiate stream migration.

Description

 Flow migration method and device

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a stream migration method and apparatus. BACKGROUND OF THE INVENTION Transmission Control Protocol/Internet Protocol (TCP/IP) is not considered in the initial design of the topology change of the terminal, that is, the TCP/IP protocol itself does not support mobility. In the traditional TCP/IP network environment, IP provides routing for the Internet. It assigns logical addresses, ie IP addresses, to all nodes (including hosts and routers), and each port of each host is assigned. An IP address. The IP address includes the network prefix and the host part. The IP addresses of all hosts on the same link usually have the same network prefix and different host parts. This allows IP to be routed based on the network prefix portion of the destination node's IP address, allowing the router to maintain a simple network prefix route without having to maintain a separate route for each host. In this case, since the network prefix route is adopted, when the node switches from one link to another without changing its IP address, the node cannot receive the data packet on the new link. As a result, it is impossible to communicate with other nodes. As users' demand for mobility and information rises sharply, more and more people want to access the Internet at high speed during the mobile process, get much-needed information, and do what they want. Therefore, the mobile Internet has become the development direction of the future Internet, but the traditional TCP/IP protocol does not support the defect of mobility, making the mobility management of mobile nodes a major problem facing the mobile Internet. In order to solve the mobility management problem, the industry's more popular mobility management technologies, such as Mobile IP (MIP) and Proxy MIP (PMIP), all introduce fixed anchors (Anchor). The way to support the mobility of the terminal. For example, the MIP protocol uses a Home Agent (HA) as an anchor point, and the PMIP protocol uses a Local Mobility Anchor (LMA) as an anchor point. 1 is a schematic structural diagram of a PMIP system according to the related art, including a mobile node (Mobile Node, abbreviated as MN), a communication peer (Correspondent Node referred to as CN), a mobile access gateway (MAG), and Local Mobility Anchor (LMA). The CN can be a fixed node or a mobile node, that is, it has a corresponding MAG and LMA. The MAG is the first hop router of the MN, and its main functions include assigning a Care of Address (CoA) to the MN when accessing it, and performing PMIP binding (PMIP) with the LM's anchor LMA instead of the MN. Binding). The LMA acts as an anchor for the MN. Its main functions include assigning a Home of Address (HoA) to the MN and processing the above PMIP binding. The main purpose of the PMIP binding performed between the MAG and the LMA is to let both parties know the address of the other party, the above CoA and HoA, and save it locally. Furthermore, in the process of performing PMIP binding, a bidirectional tunnel is established between the MAG and the LMA for the MN. It is worth noting that the IP address finally obtained by the MN is the HoA assigned by the LMA. In a typical network deployment, the MAG is generally located at a lower topology, such as at the edge of the metropolitan area network; and the LMA is generally located at a higher topology, such as the core of the provincial backbone. The MAG and the LMA are often connected by a multi-hop router. In the current PMIP network architecture, a mobile node can access simultaneously through multiple access modes. FIG. 2 is a schematic diagram of a flow migration scenario in a PMIP according to the related art. As shown in FIG. 2, the mobile node MN passes through 3GPP and WLAN respectively. MAGs are connected to the same LMA. In the above scenario, the service flow is allowed to be migrated between the two access modes. The currently defined flow migration is initiated by the terminal side. Due to the mobility of the mobile terminal itself and the actual coverage of the network, The LMA cannot detect the current connection status of the terminal, and thus cannot correctly select the access network to initiate the flow migration process. SUMMARY OF THE INVENTION The present invention is directed to the problem that the flow migration is initiated by the terminal side, and the LMA is unable to sense the connection state of the terminal. Therefore, the embodiment of the present invention provides a flow migration method and apparatus, to solve at least The above question. According to an aspect of the present invention, a flow migration method is provided, including: a local mobility anchor LMA separately obtaining state information of a terminal in multiple access networks; and the LMA is in the plurality according to the state information An access network is selected in the access network; the LMA initiates a flow migration. Preferably, the selecting, by the LMA, an access network in the multiple access networks according to the status information includes: the LMA is in accordance with the status information and/or a preset operator policy. One of the plurality of access networks is selected to select an access network. . Preferably, the LMA obtains the status information of the terminal in the multiple access networks, respectively: the LMA obtains the status information by using the MAG in the multiple access networks. Preferably, before the LMA obtains the status information by using the MAG in the multiple access networks, the method further includes: the MAG perceives the status information according to a preset period; and the MAG reports the status information to the LMA according to the period. Preferably, the LMA obtains the status information by using the MAG in the multiple access networks, respectively: the LMA initiates a flow migration query to the MAG, where the flow migration query is used to indicate the status information that the MAG senses and reports. Preferably, before the LMA obtains the status information by using the MAG in the multiple access networks, the method further includes: the MAG, according to the preset period, the status information; and the LMA acquiring the status information by using the MAG in the multiple access networks, respectively: The LMA initiates a flow migration query to the MAG, where the flow migration query is used to instruct the MAG to report status information. Preferably, before the LMA obtains the status information by using the MAG in the multiple access networks, the method further includes: determining, by the MAG, whether the changed status information is changed; and if the status information is changed, performing an operation of reporting the status information to the LMA. Preferably, if the status information has not changed, the status information is not sent to the LMA. Preferably, after the flow migration is initiated to the selected access network, the method further includes: determining that the selected access network cannot complete the flow migration; and sending the flow migration request to the access network of the next priority that is preset. According to another aspect of the present invention, a flow migration apparatus is provided, including: an acquisition module, configured to separately acquire state information of a terminal in multiple access networks; and a selection module configured to be based on the state information One of the plurality of access networks is selected to be an access network; and the initiating module is configured to initiate a flow migration. Preferably, the selection module is configured to select one of the plurality of access networks according to the status information and/or a preset operator policy. Preferably, the obtaining module comprises: an obtaining submodule, configured to acquire state information through the mobile access gateway MAG in the plurality of access networks respectively. In the above embodiment, the LMA obtains the status information of the terminal in multiple access networks, which ensures that the LMA can correctly select the access network to initiate the flow migration. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic structural diagram of a PMIP system according to the related art; FIG. 2 is a schematic diagram of a scenario of flow migration in a PMIP according to the related art; 3A is a flowchart of a flow migration method according to an embodiment of the present invention; FIG. 3B is a flowchart of a flow migration method according to a preferred embodiment of the present invention; FIG. 4 is an interaction flow of a flow migration method according to a preferred embodiment of the present invention; Figure 5 is an interaction flow chart of a flow migration method according to a preferred embodiment 2 of the present invention; Figure 6 is an interaction flow chart of a flow migration method according to a preferred embodiment 3 of the present invention; Figure 7 is a fourth embodiment of the present invention. FIG. 8 is an interaction flowchart of a flow migration method according to a preferred embodiment 5 of the present invention; and FIG. 9 is a structural block diagram of a flow migration apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. In the embodiment, a flow migration method is provided. FIG. 3A is a flowchart of a flow migration method according to an embodiment of the present invention. As shown in FIG. 3A, the method includes the following steps: Step S302A, local mobility anchor point LMA respectively Obtaining state information of the terminal in multiple access networks; Step S304A: The LMA selects one access network among the plurality of access networks according to the state information. In step S306A, the LMA initiates a flow migration. Through the above steps, the migration can be initiated by the LMA, thereby changing the problem caused by the terminal side initiation. In a preferred embodiment, the LMA may select an access network by acquiring state information of the terminal and/or a policy of the operator. In the preferred embodiment, a flow migration method is provided, and FIG. 3B is a preferred implementation according to the present invention. A flowchart of the flow migration method of the example, as shown in FIG. 3B, includes the following steps S302B to S306B. Step S302B: The local mobility anchor LMA obtains state information of the terminal in multiple access networks, respectively. Step S304B: Select one of the plurality of access networks according to the state information and the preset operator policy. Specifically, the access network is selected from the plurality of access networks, and the basis for selecting the access includes at least one of the following: the status information acquired in step S302B, and the preset policy of the operator. A preferred implementation is to select an access network based on status information and pre-defined operator policies. Step S306B, initiating a flow migration. In the related art, the flow migration is initiated by the terminal side, and the LMA cannot sense the connection status of the terminal, and thus cannot correctly select the access network to initiate the flow migration process. In the embodiment of the present invention, the connection status information of the terminal is sent by the MAG to the LMA, which ensures that the LMA can correctly select the access network to initiate the flow migration. Preferably, in step S302, the LMA can obtain status information of the terminal in multiple access networks through MAGs in multiple access networks. For example, the entire process of acquiring state information through the MAG may be periodic execution or event triggering, so that the terminal state and access network type mapping stored on the LMA are kept up to date. The following description will be respectively made in the preferred embodiments.

(1) The MAG senses and reports the status of the terminal according to a preset period. The steps are as follows:

The MAG perceives the status information according to a preset period; the MAG reports the status information to the LMA according to the period.

(2) The flow migration query is used to trigger the MAG to sense the terminal status. The steps are as follows: The LMA initiates a flow migration query to the MAG, where the flow migration query is used to indicate the state information that the MAG senses and reports; the MAG senses the state information; the MAG to the LMA Report status information.

(3) The MAG detects the status of the terminal according to the preset period, and the flow migration query triggers the MAG to report the status information. The steps are as follows:

The MAG instructs the state information according to the preset period. The LMA initiates a flow migration query to the MAG, where the flow migration query is used to instruct the MAG to report the status information. The MAG reports the status information to the LMA. Considering whether the status of the terminal changes before the MAG reports the status information, it is decided whether to send the status information to the LMA for updating. This can avoid repeated operations and improve efficiency. Therefore, in this embodiment, before the LMA obtains the state information through the MAGs in the multiple access networks, the following operations may be performed: The MAG determines whether the perceived state information changes, and if the state information changes, the report is reported to the LMA. Operation of status information; if status information has not changed, status information is not sent to the LMA. In addition, if the selected access network cannot complete the flow migration, the flow migration fails. Therefore, in a preferred embodiment, the access network can be prioritized. If a flow migration is initiated to the selected access network, If the terminal state of the currently selected access network cannot complete the flow migration process, the flow migration request is sent to the access network of the next priority. This will prevent the flow migration request from failing. The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. The flow migration of the following preferred embodiments is performed in the scenario shown in FIG. 2, which is different from the single access. In the multiple access scenario, the access network type is not replaced on the LMA, but multiple access network types are available. coexist. Preferred Embodiment 1 FIG. 4 is an interaction flowchart of a flow migration method according to a preferred embodiment of the present invention. As shown in FIG. 4, the following steps S402 to S416 are included. In step S402, the MAGI senses the current state of the terminal. The method for sensing the state of the terminal by the specific MAG may adopt the neighbor non-reachable detection in the neighbor discovery mechanism, or the PIG packet is sent by the MAG to the terminal, and according to the access network, the measurement defined by the corresponding access network may also be used. the way. Step S404, the MAGI sends a proxy binding update message to the LMA, and carries the terminal status and the corresponding access network type in the message. The terminal status may be connected, disconnected, dormant/power-saving, or out of service. The type of access network here is prior art, but it needs to be bound to the terminal status and stored on the LMA. Step S406, the LMA sends a proxy binding response to the MAGI. When the MN accesses the 3GPP, the MAG can be mapped to a Mobility Management Entity (MME) and a Serving Gateway (S-GW), and the LMA can be a packet data. A network gateway (PDN Gateway, P-GW for short), which uses the General Data Transfer Platform (GTP) for interaction, such as bearer modification request/response, session establishment request/response. Step S408, the MAG2 senses the current state of the terminal. This step may be performed simultaneously with the initiation of step S402, regardless of the order. Step S410, the MAG2 sends a proxy binding update message to the LMA, and carries the terminal status and the corresponding access network type in the message. Step S412, the LMA sends a proxy binding response to the MAGI. The above steps S402 to S412 are periodically performed, so that the terminal state and the access network type mapping stored on the LMA are kept up to date. In step S414, when the flow on the MN needs to be migrated, the LMA queries the status of the terminal and the corresponding access network type, and finally determines which access network type to use for the flow migration according to the operator policy. Step S416, the LMA initiates a stream migration process. Preferred Embodiment 2 FIG. 5 is an interaction flowchart of a flow migration method according to a preferred embodiment 2 of the present invention. As shown in FIG. 5, the following steps S502 to S520 are included. In step S502 to step S504, the LMA initiates a flow migration query/response to the MAGI and the MAG2, and is used to trigger the reporting of the current state of the terminal. Step S502 and step S504 may occur simultaneously, regardless of the order. Step S506, the MAGI senses the current state of the terminal. Step S508, the MAGI sends a proxy binding update message to the LMA, and carries the terminal state and the corresponding access network type in the message. The terminal status may be connected, disconnected, dormant/power-saving, or out of service. The type of access network here is prior art, but it needs to be bound to the terminal status and stored on the LMA. Step S510, the LMA sends a proxy binding response to the MAGI. In step S512, the MAG2 senses the current state of the terminal, and this step may be performed simultaneously with the initiation of step S506, regardless of the sequence. Step S514, the MAG2 sends a proxy binding update message to the LMA, and carries the terminal status and the corresponding access network type in the message. Step S516, the LMA sends a proxy binding response to the MAGI. Step S518: The LMA determines, according to the current state of the terminal and the corresponding access network type, which carrier network type to use for traffic migration. In step S520, the LMA initiates a stream migration process. Preferred Embodiment 3 FIG. 6 is an interaction flowchart of a flow migration method according to a preferred embodiment 3 of the present invention. As shown in FIG. 6, the following steps S602 to S620 are included. Step S602, the MAGI senses the current state of the terminal. In step S604, the MAG2 senses the current state of the terminal. This step may be performed simultaneously with the initiation of step S602, regardless of the order. The above steps S602 and S604 are performed periodically, so that the state of the terminal stored on the MAG is kept up to date. Step S606 to step S608, the LMA initiates a flow migration query/response to the MAGI and the MAG2, and is used to trigger the reporting of the binding relationship between the current state and the access network type of the terminal by the MAG. Step S610, the MAGI sends a proxy binding update message to the LMA, and carries the terminal status and the corresponding access network type in the message. Step S612, the LMA sends a proxy binding response to the MAGI. Step S614, the MAG2 sends a proxy binding update message to the LMA, and carries the terminal status and the corresponding access network type in the message. This step may be performed simultaneously with the initiation of the step S610, regardless of the sequence. . Step S616, the LMA sends a proxy binding response to the MAGI. Steps S606, S614, S616 and steps S608, S610, and S612 may occur simultaneously, regardless of the sequence of steps S618. The LMA determines which access network to use according to the current policy of the terminal and the corresponding access network type. Type for stream migration. In step S620, the LMA initiates a flow migration process. Preferred Embodiment 4 FIG. 7 is an interaction flowchart of a flow migration method according to a preferred embodiment 4 of the present invention. As shown in FIG. 7, the following steps S702 to S716 are included. Step S702, the MAGI senses the current state of the terminal. Step S704, if the MAG1 finds that the terminal status changes, the MAG1 updates by carrying the proxy binding update message to the LMA to carry the terminal status and the access network type; otherwise, the MAG1 does not update the current terminal status to the LMA. Step S706, the LMA sends a proxy binding response to the MAGI. In step S708, the MAG2 senses the current state of the terminal. This step and step S702 may be performed periodically and have no sequence, which may occur at the same time. Step S710: If the MAG2 finds that the terminal status changes, the MAG2 updates by carrying the proxy binding update message to the LMA to carry the terminal status and the access network type; otherwise, the MAG2 does not update the current terminal status to the LMA. Step S712, the LMA sends a proxy binding response to the MAG2. Step S714: The LMA uses the access network type to perform flow migration according to the current terminal state and the access network type, and the final decision of the operator policy. In step S716, the LMA initiates a stream migration process. Preferred Embodiment 5 FIG. 8 is an interaction flowchart of a flow migration method according to a preferred embodiment 5 of the present invention. As shown in FIG. 8, the following steps S802 to S814 are included. Steps S802 to S804, MAGI and MAG2 sense the terminal status and store it locally, which may be a periodic measurement or an event trigger. Step S806, the LMA performs flow migration according to which access network type is used according to the reference operator policy decision. Step S808: The LMA sends a flow migration request to the MAGI, but the terminal state on the MAG1 cannot complete the flow migration process, and the MAG1 returns a flow migration response to the LMA and carries a rejection indication. Step S810: The LMA performs flow migration according to the operator policy using the access network type of the next priority. Step S812: The LMA sends a flow migration request to the MAG2, and the terminal state on the MAG2 can complete the flow migration process, and the MAG2 returns a flow migration response to the LMA and carries an acceptance indication. Step S814, MAG2 completes the flow migration. It should be noted that the steps shown in the flowchart of the drawing may be performed in a computer system such as a set of computer executable instructions, and although shown in the flowchart The logical order, but in some cases, the steps shown or described may be performed in a different order than the ones described herein. The embodiment of the invention provides a flow migration device, which can be configured to implement the above flow migration method. FIG. 9 is a structural block diagram of a stream migration apparatus according to an embodiment of the present invention. As shown in FIG. 9, an acquisition module 92, a selection module 94, and an initiation module 96 are included.

 The obtaining module 92 is configured to separately obtain status information of the terminal in multiple access networks;

The selecting module 94 is configured to select one of the plurality of access networks according to the status information, and the initiating module 96 is configured to initiate the stream migration. The embodiment of the present invention further provides a preferred flow migration device, which may be configured to implement the above flow migration method. The preferred stream migration device, as shown in FIG. 9, includes an acquisition module 92, a selection module 94, and an initiation module 96. The structure is described in detail below. The obtaining module 92 is configured to obtain state information of the terminal in multiple access networks respectively. The selecting module 94 is connected to the obtaining module 92, and is set to obtain the state information acquired by the obtaining module 92 and the preset operator policy. One of the plurality of access networks selects an access network; the initiating module 96 is coupled to the selection module 94 and configured to initiate flow migration. Preferably, the obtaining module 92 includes an obtaining submodule configured to acquire state information through the mobile access gateway MAG in the plurality of access networks, respectively. It should be noted that the flow migrating device described in the device embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In a preferred embodiment, a processor is provided that is configured to execute program units stored in a memory, the modules included in the program units being the modules mentioned in any of the above embodiments. In summary, according to the above embodiments of the present invention, a stream migration method and apparatus are provided to ensure that the LMA can correctly select an access network to initiate a flow migration. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim 1. A method of stream migration, comprising:  The local mobility anchor LMA obtains state information of the terminal in multiple access networks, respectively; the LMA selects one access network among the multiple access networks according to the state information; migrate. 2. The method according to claim 1, wherein the selecting, by the LMA, one of the plurality of access networks according to the status information comprises: the LMA according to the status information and/or A preset operator policy selects one of the plurality of access networks. The method according to claim 1 or 2, wherein the obtaining, by the LMA, the status information of the terminal in the multiple access networks respectively comprises: the LMA respectively accessing the mobile access in the multiple access networks The gateway MAG acquires the status information. The method according to claim 3, wherein before the obtaining, by the MAG, the status information by the MAG in the multiple access networks, the method further includes:  The MAG perceives the status information according to a preset period;  The MAG reports the status information to the LMA according to the period. The method of claim 3, wherein the obtaining, by the LMA, the status information by using the MAG in the multiple access networks, respectively: the LMA respectively initiates a flow migration query to the MAG, where The flow migration query is used to indicate the status information that the MAG senses and reports. 6. The method according to claim 3, wherein  Before the obtaining, by the MAG, the status information by using the MAG in the multiple access networks, the method further includes: the MAG sensing the status information according to a preset period;  The obtaining, by the LMA, the status information by using the MAG in the multiple access networks, respectively, that: the LMA initiates a flow migration query to the MAG, where the flow migration query is used to indicate that the MAG reports the status information. The method according to claim 3, wherein before the obtaining, by the MAG, the status information by using the MAG in the multiple access networks, the method further includes: Determining, by the MAG, whether the sensed state information changes;  If the status information changes, an operation of reporting the status information to the LMA is performed. 8. The method according to claim 7, wherein the status information is not sent to the LMA if the status information has not changed. The method according to claim 1 or 2, wherein after the stream migration is initiated to the selected access network, the method further includes:  Determining that the selected access network cannot complete the flow migration;  A flow migration request is sent to the access network of the next priority set in advance. 10. A flow migration device comprising:  An acquiring module, configured to respectively obtain status information of the terminal in multiple access networks; and selecting a module, configured to select one of the multiple access networks according to the status information;  The initiating module is set to initiate a stream migration.  11. The apparatus of claim 10, wherein the selection module is configured to be based on the status information and / or a preset operator policy, selecting one of the plurality of access networks. The device according to claim 10 or 11, wherein the acquiring module comprises: an obtaining submodule, configured to obtain the status information by using a mobile access gateway MAG in the multiple access networks respectively.