KR101262356B1 - Link control method in multi-path - Google Patents

Link control method in multi-path Download PDF

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Publication number
KR101262356B1
KR101262356B1 KR1020110006886A KR20110006886A KR101262356B1 KR 101262356 B1 KR101262356 B1 KR 101262356B1 KR 1020110006886 A KR1020110006886 A KR 1020110006886A KR 20110006886 A KR20110006886 A KR 20110006886A KR 101262356 B1 KR101262356 B1 KR 101262356B1
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South Korea
Prior art keywords
downlink
communication
communication path
lma
uplink
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KR1020110006886A
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Korean (ko)
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KR20120085512A (en
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김대영
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주식회사 네이블커뮤니케이션즈
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Priority to KR1020110006886A priority Critical patent/KR101262356B1/en
Priority to PCT/KR2012/000232 priority patent/WO2012102499A2/en
Publication of KR20120085512A publication Critical patent/KR20120085512A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport

Abstract

The downlink control method is performed in a Local Mobility Anchor (LMA) capable of connecting to a Correspondent Node (CN) and a Mobile Node (MN). The LMA and MN are connected by at least two communication paths. The method comprises receiving a downlink message from the CN, (i) downlink configuration information about the MN to which the downlink message is to be received, and (ii) a first communication path of the at least two communication paths. Identifying an uplink history related to the downlink communication path of any one of the at least two communication paths based on the identified downlink configuration information or information on the downlink message and the uplink history; Selecting as.

Description

How to control link in multipath {LINK CONTROL METHOD IN MULTI-PATH}

The disclosed technique relates to a link control method in multiple paths, and more particularly to a downlink and uplink control method between elements that can be connected in at least two paths.

Today's mobile terminals can communicate over multiple communication paths. However, despite the multiple communication paths of the mobile terminal, the mobile service is performed only through the specific path initially established.

Among the embodiments, the downlink control method is performed in a Local Mobility Anchor (LMA) capable of connecting to a communication node (CN) and a mobile node (MN). The LMA and MN are connected by at least two communication paths. The method comprises receiving a downlink message from the CN, (i) downlink configuration information about the MN to which the downlink message is to be received, and (ii) a first communication path of the at least two communication paths. Identifying an uplink history related to the downlink communication path of any one of the at least two communication paths based on the identified downlink configuration information or information on the downlink message and the uplink history; Selecting as.

Among the embodiments, the LMA may be connected to a CN (Correspondent Node) and a MN (Mobile Node) through a communication network, and the LMA and the MN are connected to at least two communication paths. The LMA includes a communication module for receiving a downlink message from the CN and (i) downlink configuration information about an MN to which the downlink message is to be received, and (ii) a first communication path of the at least two communication paths. Identify an uplink history for the downlink, and downlink the communication path of any one of the at least two communication paths based on the identified downlink configuration information or information on the downlink message and the uplink history. It includes a control unit for selecting as.

Among the embodiments, the uplink control method is performed in a mobile node (MN) capable of connecting to a communication node (CN) and a local mobility anchor (LMA). The LMA and MN may be connected to at least two communication paths, and the first communication path has a higher communication cost than other communication paths. The method includes (a) checking if a downlink message from the LMA is received over a first communication path and accessing the other communication path; and (b) if accessing the first communication path, the LMA. And substituting with the other communication path in cooperation.

Among the embodiments, the downlink control system includes a Correspondent Node (CN), a Mobile Node (MN) and a Local Mobility Anchor (LMA). The LMA can be connected to the CN and the MN in at least two communication paths, receives a downlink message from the CN, and (i) downlink configuration information about the MN to which the downlink message is received; (ii) identifying an uplink history or a downlink history of a first communication path of the at least two communication paths, and reconstructing the information on the identified downlink configuration information or downlink message and uplink history or downlink history; Select one of the at least two communication paths as a downlink based on that.

1 is a diagram illustrating a link system according to an embodiment of the disclosed technology.
FIG. 2 is a configuration diagram according to an embodiment of a local mobility anchor (LMA) of FIG. 1.
FIG. 3 is a block diagram illustrating a downlink setting operation of the LMA of FIG. 2.
4 is a flowchart illustrating a downlink establishing method according to an embodiment of an LMA.
5 is a schematic diagram of an MN according to an embodiment of the disclosed technology.
6 is a flowchart of an uplink control method according to an embodiment of an MN according to FIG. 5.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It should be understood that the term "and / or" includes all possible combinations from one or more related items. For example, the meaning of "first item, second item and / or third item" may be presented from two or more of the first, second or third items as well as the first, second or third item It means a combination of all the items that can be.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when a component is referred to as being "directly connected" to another component, it should be understood that no component exists. On the other hand, other expressions describing the relationship between the components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring to", should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present application.

1 is a diagram illustrating a link system according to an embodiment of the disclosed technology.

Referring to FIG. 1, the link system 100 includes a correspondent node (Correspondent Node, CN 110), LMA (Local Mobility Anchor, 120), a mobile access gateway (MAG) 130, a mobile node ( Mobile Node, hereafter MN 140). The link system 100 may be applied as a downlink system or an uplink system.

In FIG. 1, it is assumed that the LMA 120 and the MN 140 are connected to the 3G communication network and the Wi-Fi wireless network. However, the LMA 120 may be connected to the MN 140 using a different wireless network. Therefore, this should not be construed as limiting the scope of rights.

The CN 110 is a service provider and is connected to the MN 140 through the LMA 120. In one embodiment, CN 110 may correspond to a server providing PUSH service to MN 140. In one embodiment, CN 110 may be a soft switch that provides Voice Over Internet Protocol (VoIP) service to MN 140. In one embodiment, CN 110 may be an Application Application Server that provides Instant Messaging Service services to MN 140.

The LMA 120 sets downlink for transmitting the data received from the CN 110 to the MN 140. The LMA 120 will be described with reference to FIGS. 2 to 4.

The Mobile Access Gateway (MAG) 130 corresponds to a gateway disposed between the LMA 120 and the MN 140. The Mobile Access Gateway (MAG) 130 may be disposed for each communication path between the LMA 120 and the MN 140.

The MN 140 is a mobile communication node, and may be connected to the LMA 120 through at least two different communication paths through the MAG 130. MN 140 will be described with reference to FIG. 5.

FIG. 2 is a configuration diagram according to an embodiment of a local mobility anchor (LMA) of FIG. 1.

Referring to FIG. 2, the LMA 120 includes a communication unit 210, an uplink history storage unit 220, an IP communication module 230, a control unit 240, and a downlink setting information management unit 250.

The communication unit 210 includes at least two logical communication modules forming a communication path with the MN 140. The first communication module 211 may communicate through this module as a communication module for the first communication path, in one embodiment, through the wireless Internet (Wi-Fi) connected to the MN 140. The second communication module 212 can communicate via this module as a communication module for the second communication path, in one embodiment, via a cellular communication network connected to the MN 140. The IP communication module 230 is used to communicate with the CN 110 via the Internet. In actual implementation, the physical communication module may be implemented using one module that is connected to the same IP communication network as the IP communication module, the first communication module, and the second communication module.

The downlink setting information storage unit 250 stores downlink setting information about the MN 140, which is a reception target of the downlink message. In one embodiment, the downlink configuration information may include communication network configuration information connectable by the MN 140. For example, if the first MN can be connected to both the wireless Internet communication network and the cellular communication network, the downlink configuration information may include information on the first and second communication paths as downlink configuration information of the first MN. For another example, if the second MN can be connected to the cellular communication network, the downlink configuration information may include information about the second communication path as downlink configuration information of the second MN. In another embodiment, the downlink configuration information may include Quality of Service (QoS) information regarding the MN 140. For example, if the first MN receives a large amount of real-time service, the downlink setting information is downlink setting information of the first MN, and information about a communication path (for example, a first communication path) suitable for a large amount of real-time service. It may include. For another example, if the first MN receives a small amount of real-time service, the downlink configuration information is a downlink configuration information of the first MN regarding a communication path (eg, a second communication path) suitable for the small capacity real-time service. May contain information. In one embodiment, the downlink configuration information storage unit 250 may store the identifier (for example, telephone number, ID, etc.) and downlink configuration information of the MN 140 together.

The uplink history storage unit 220 stores uplink history (ie, history of uplink packets) received from the MN 140 through the first communication module (ie, the first communication path). In one embodiment, the uplink history storage unit 220 may store a timestamp of the uplink packet received from the MN 140 from the most recent to a predetermined time, and when the predetermined time elapses, the uplink history storage unit 220 may store the timestamp. You can delete it. In one embodiment, the uplink history storage unit 220 may store an identifier (eg, a telephone number) of the MN 140 and an uplink history together. The uplink history storage unit 220 may store the same data with respect to the data through the second communication module.

In the present invention, for the sake of simplicity, it has been described that only the uplink history is stored, but the downlink history is also stored, and this information may also be used. For simplicity, the history storage of the downlink is omitted. (A patent attorney, can you put downlink history as a dependent claim?)

Although the above description has been based on the embodiment of storing only uplink history for convenience of description, the disclosed invention may store and use downlink history (downlink packet history). The downlink history storage unit 260 may perform an operation corresponding to the uplink history storage unit 220 except for replacing the history of the uplink packet with the history of the downlink packet. For example, the controller 240 checks the most recent downlink history stored in the downlink history storage unit 260 so that the first communication path (WiFi network) can be maintained (eg, 1 minute). If a downlink history exists within), the first communication path can continue to be used as the downlink path.

The control unit 240 includes (i) downlink setting information about the MN 140 to which the downlink message is received, and (ii) a first communication path (for example, a wireless Internet communication path) and / or a second communication. The communication path of the downlink is determined based on the Uplink History on the path.

3 is a flowchart illustrating a downlink setting operation of the LMA of FIG. 2, and FIG. 4 is a flowchart of a downlink setting method according to an embodiment of the LMA.

In FIG. 3, LMA 120 receives a downlink message from CN 110 (step S310). In order to establish a downlink for the MN 140, the LMA 120 may (i) downlink configuration information about the MN to receive the downlink message and (ii) a first communication of at least two communication paths. The uplink history regarding the path and / or the second communication path is checked (step S320). The LMA 120 selects any one of at least two communication paths to the MN 140 as the downlink based on the downlink configuration information and the uplink history (step S330).

Referring to FIG. 4, each step of FIG. 3 will be described in more detail. 4 is assuming that only the uplink history of the first communication path is checked.

When the downlink message is received from the CN 110 (step S410), the LMA 120 checks the downlink setting information regarding the MN to which the downlink message is received (step S420), and the uplink of the first communication path is up. The link history is checked (step S430).

In operation S420, in one embodiment, the LMA 120 may check communication network setting information connectable by the MN 140. For example, if the communication network connectable by the MN corresponds to the cellular network, the LMA 120 may select a second communication path (that is, a communication path through the cellular network) as the communication path. For another example, if the communication network connectable by the MN includes a wireless Internet network and a cellular network, the LMA 120 may include a first communication path (ie, a communication path through the wireless Internet) or a second communication path (ie, a cellular network). Communication path) can be selected. In another embodiment, the LMA 120 may verify QoS information regarding the MN 140. For example, the LMA 120 may select a second communication path (that is, a communication path through the cellular network) as a communication path if the service does not end in the middle regardless of user movement. For another example, the LMA 120 may select a first communication path (that is, a communication path through the wireless Internet) as a communication path if the service requires a large capacity even if it is cut off. Alternatively, an operator (for example, an operator of a 3G network) may put a desired priority in the LMA 120.

In step S430, in one embodiment, the LMA 120 may check the uplink history of the first communication path. In one embodiment, the LMA 120 may check the timestamp of the most recent uplink packet stored in the uplink history storage 220. Meanwhile, the uplink history storage unit 220 may store the uplink history up to a predetermined time from the most recently received uplink packet.

If the time stamp is within the valid time (step S440), the LMA 120 sets the first communication path to the downlink (step S450). In one embodiment, the validity time may be determined based on the portbinding time of the NAT device on the first communication path. Here, the MN 140 may not continuously communicate to the NAT device to reduce power consumption, in which case the reason why the LMA 120 checks the valid time is that the first communication path with the MN 140 is still To see if it is maintained.

If the valid time has elapsed, the LMA 120 selects one of the remaining communication paths except the first communication path as the downlink (step S460). For example, if the first communication path is not maintained, the LMA 120 may select the cellular communication network as the downlink.

Although FIG. 4 illustrates that only the uplink history of the first communication path is determined and determined, this is for convenience of description and only reports the uplink history of the second communication path or the uplink history of the first and second communication paths. It can also be done to see and decide. It can also be implemented to view and determine downlink history as well as uplink history. For simplicity of explanation, the present invention assumes that only the uplink packet history of the first mobile communication path is determined and determined.

5 is a schematic diagram of an MN according to an embodiment of the disclosed technology.

Referring to FIG. 5, the MN 140 may include a communication unit 510, a communication interface unit 520, and an application unit 530.

The communication unit 510 includes a plurality of communication modules capable of forming a communication path with the LMA 120. In one embodiment, the first communication module 511 may be used for the first communication path, and in one embodiment, may form a communication path with the LMA 120 through a network address translation (NAT) device.

The communication interface unit 520 controls the communication unit 510 and will be described with reference to FIG. 6. The application unit 530 is a subject that performs communication with the CN 110 through the communication interface unit 520, and in one embodiment, may be transparent to the communication unit 510. That is, the application unit 530 may be operated regardless of the communication modules in the communication unit 510.

6 is a flowchart illustrating an uplink control method according to an embodiment of an MN in FIG. 5.

6 assumes that the LMA 120 and the MN 140 can be connected to at least two communication paths, and the first communication path has a higher communication cost than other communication paths. 6 also assumes that the first communication path is connected by the first communication module 511 of the MN 140 to the second communication path by the second communication module 512.

When the downlink message is received from the LMA 120 through the first communication path (step S610), the communication interface unit 520 checks whether the LMA 120 can be accessed through a communication path other than the first communication path. (Step S620).

If a communication path other than the first communication path is accessible, the communication interface unit 520 cooperates with the LMA 120 to replace the first communication path with another communication path (step S630). If no other path is accessible, the communication interface unit 520 maintains the current first communication path (step S640).

In operation S630, in one embodiment, the communication interface unit 520 may replace a communication path by selecting a path that satisfies a specific criterion more than other communication paths.

 Here, the particular criterion may be determined by at least one or a combination of (i) the cost of the communication cost (e.g., the cheaper the better), (ii) the stability of the communication path, or (iii) the size of the required bandwidth.

The MN 140 has first to fourth communication modules, and the communication cost is that the first communication path using the first communication module is the most expensive, and sequentially decreases, so that the fourth communication path using the fourth communication module is the cheapest. Suppose When the MN 140 determines that the second communication path is established using the LMA 120 and the second communication module, the communication interface 520 may transmit the LMA 120 through the first, third, and fourth communication paths. ) Can be accessed. If the first communication path and the fourth communication path are available, the communication interface unit 520 may replace the second communication path by using the fourth communication path having a low communication cost.

In one embodiment, the replacement of the communication path may be performed in a soft handover manner. For example, when the MN 140 and the LMA 120 currently set a path through the second communication path, the communication interface unit 520 maintains the LMA 120 and the second communication path for a predetermined time. It replaces using a communication path (4th communication path in the above-mentioned example). Soft handover scheme can maintain the stability of the communication connection relatively.

In another embodiment, the replacement of the communication path may be performed in a hard handover manner. For example, when the MN 140 and the LMA 120 establish a path through the current second communication path, the communication interface unit 520 terminates the connection of the existing second communication path and the other communication path (the first communication path). 4 communication path) can be connected. Hard handover schemes can relatively simplify the communication connection.

In another embodiment, replacement of the communication path may be made by the MN 140 sending uplink packets to a particular communication path.

In one embodiment, the downlink message may include information about the service provided by CN 110 via LMA 120.

For example, suppose that the LMA 120 and the MN 140 are connected to the cellular communication network and the wireless Internet communication network, and are connected to the cellular communication network with high communication cost. The communication interface unit 520 may check the communication bandwidth required for the service based on the downlink message, and if the communication bandwidth is greater than or equal to a predetermined value, may update the wireless Internet communication network as a communication path. In this case, even if a communication path (first communication path) is established through the cellular communication network, a service having a large bandwidth can be changed to a communication path (second communication path) through a wireless internet communication network having a low communication cost, and thus the MN 140. You can get high quality service while keeping communication cost low.

The disclosed technique may have the following effects. It is to be understood, however, that the scope of the disclosed technology is not to be construed as limited thereby, as it is not meant to imply that a particular embodiment should include all of the following effects or only the following effects.

The link control method according to an embodiment may relatively increase the service maintenance time of the mobile terminal. The mobile terminal maintains the NAT table because it maintains uplink history received through the NAT (Network Address Translation) device in the wireless Internet network and sends data through other communication paths when data cannot be transferred through the NAT. This is because the packets do not need to be sent often.

The link control method according to an embodiment may stably provide a service. This is because the communication path can be secured by using another communication path even when the communication path between the mobile terminal and the wireless Internet is lost.

The link control method according to an embodiment may maintain a relatively low communication cost even for a service having a large communication bandwidth. This is because even if a communication path has already been established to the cellular communication network, the communication path can be changed to the wireless Internet communication network by the uplink control of the mobile terminal.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims It can be understood that

Claims (20)

In a downlink control method performed in a Local Mobility Anchor (LMA) capable of connecting to a Correspondent Node (CN) and a Mobile Node (MN), the LMA and the MN are connected to at least two communication paths.
(a) receiving a downlink message from the CN;
(b) downlink configuration information on the MN to which the downlink message is received and (ii) the most recently received uplink packet on a first communication path of the at least two communication paths. Identifying an Uplink History including a timestamp; And
(c) selecting one of the at least two communication paths as a downlink based on the identified downlink configuration information or information on the downlink message and uplink history; Downlink control method.
delete 2. The method of claim 1, wherein step (c)
Confirming a timestamp of the most recently received first uplink packet in the identified uplink history; And
And selecting the first communication path as the downlink when the identified timestamp is within a predetermined valid time.
The method of claim 3, wherein step (c)
And selecting one of the remaining communication paths except the first communication path if the checked time stamp is after the predetermined valid time.
The method of claim 3, wherein the valid time is
And determining based on a port binding time of a network address translation (NAT) device on the first communication path.
The method of claim 1, wherein the downlink configuration information
Downlink control method comprising: communication network configuration information connectable by the MN or quality of service (QoS) information regarding the MN.
In a Local Mobility Anchor (LMA) capable of connecting to a CN (Correspondent Node) and a MN (Mobile Node) through a communication network, wherein the LMA and the MN are connected to at least two communication paths,
A communication module for receiving a downlink message from the CN;
(i) confirm downlink configuration information on the MN to which the downlink message is received, and (ii) an uplink history on a first communication path among the at least two communication paths, and confirm A controller for selecting any one of the at least two communication paths as a downlink based on the downlink configuration information or the information on the downlink message and the uplink history; And
And a downlink setting information storage unit for storing downlink setting information about an MN to which the downlink message is received.
The method of claim 7, wherein the downlink configuration information
LMA, characterized in that it comprises connectable network configuration information or quality of service (QoS) information.
delete The method of claim 7, wherein
And an uplink history storage unit for storing an uplink history for the first communication path and an identifier of the corresponding MN.
11. The method of claim 10, wherein the uplink history is
And a timestamp for the uplink packet received from the most recent until a predetermined time.
8. The LMA of claim 7, wherein the first communication path corresponds to a wireless Internet communication.
In the uplink control method performed in a mobile node (MN) that can be connected to a CN (Correspondent Node) and LMA (Local Mobility Anchor) in a communication network,-The LMA and MN can be connected to at least two communication paths-, Uplink control method
(a) identifying another communication path that satisfies a particular criterion more than the first communication path when a downlink message is received from the LMA through a first communication path; And
(b) if accessible, sending an uplink packet over a second communication path,
The step (b) of the uplink control method comprising the step of selecting the communication path of the lowest communication cost among the other communication path to replace the other communication path.
delete 14. The method of claim 13, wherein step (b)
And a soft handover scheme using the other communication path while maintaining the first communication path for a predetermined time.
14. The method of claim 13, wherein step (b)
And a hard handover scheme for terminating the first communication path and connecting the other communication paths.
The method of claim 13, wherein the downlink message is
Uplink control method comprising information on a service provided by the CN.
18. The method of claim 17, wherein step (b)
If the service requires more than a predetermined communication bandwidth, selecting a communication path that provides more than the corresponding bandwidth among the other communication paths.
The method of claim 13, wherein the specific criteria is
i) the cost of the communication cost, (ii) the stability of the communication path, or (iii) the size of the required bandwidth, or a combination thereof.
In the downlink control system including a CN (Correspondent Node), LMA (Local Mobility Anchor) and MN (Mobile Node),
CN;
When a downlink message is received from the LMA through a first communication path, another communication path that satisfies a specific criterion more than the first communication path is identified and, if accessible, the first communication path is terminated and a hard handover is performed. MN (Mobile Node) for connecting other communication paths; And
Connect to the CN and the MN in at least two communication paths, receive a downlink message from the CN, and (i) downlink configuration information about the MN to which the downlink message is received; and (ii) Confirm an uplink history or a downlink history with respect to a first communication path of the at least two communication paths, and based on the identified downlink configuration information or information about the downlink message and the uplink history or the downlink history; A downlink control system comprising a Local Mobility Anchor (LMA) for selecting any one of at least two communication paths as a downlink.
KR1020110006886A 2011-01-24 2011-01-24 Link control method in multi-path KR101262356B1 (en)

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