KR101396980B1 - Method For Providing Information Service With Dynamic Information Element And Method For Updating The Dynamic Information Element - Google Patents

Abstract

An information service providing method and a dynamic information element updating method for providing dynamic information elements are disclosed. That is, a method of providing an information service includes transmitting a request message for a predetermined information element (IE), and receiving a response message to the request message, Wherein the information element is configured to include the validity information of the dynamic information element when the information element is a dynamic information element, thereby enabling an efficient information service including the dynamic IE.

Also, the reliability of the dynamic information element can be maintained by requesting update of the corresponding information element through checking the validity information, and receiving a response thereto.

Dynamic information element

Description

TECHNICAL FIELD [0001] The present invention relates to an information service providing method and a dynamic information element updating method for providing a dynamic information element,

The present invention relates to a method of providing an information service and a method of updating specific information in a mobile communication system, and more particularly, to providing an information service for providing a dynamic information element as well as a static information element And a method for updating such dynamic information elements.

Media Independent Handover (MIH) technology provides seamless handover and service continuity between heterogeneous networks to improve user convenience of a mobile terminal device . Details of such MIH technology can be found in the IEEE 802.21 standard.

The MIH function (MIHF) that enables the above-mentioned role to function as an asymmetric service such as an event service (ES) to upper layers and lower layers through a well-defined service access point (SAP) And a command service (CS).

The mediator-free handover technology consists of three MIHF services and an agentless handover protocol. The three main MIHF services are Event Service (ES), Command Service (CS), and Information Service (IS).

Hereinafter, each service will be briefly described.

The event service is information transmitted from the link layer to higher layers, and upper layers can receive this information by a registration procedure. Upper layers including the mobility management protocol need to receive the link layer information such as the fact that the handover is expected to occur soon or the handover is performed in order to assist handover in predicting the handover. The event service includes a link event terminated in the MIHF and an MIH event (MIH Event) propagated to the upper layers (three or more layers) registered in the MIHF from the entity generating the event in the lower layers (2 layers or less) .

Link events and MIH events can be further classified into two types according to the propagation area. When events are originated from the source of events in the local stack and propagated upwards to the local MIHF or MIHF upstairs, they are called local events, originated from remote event sources and delivered to the remote MIHF, If this is handed off remotely from the remote MIHF to the local MIHF, this event can be called Remote Events.

Next, the command service is configured such that upper layers and other MIH users are sent from lower layers (less than or equal to two layers) to higher layers (more than or equal to 3 layers) to determine the link state and to coordinate the optimized operation of the multi- Commands. Similar to the event services, the command service can be divided into a link command and an MIH command (MIH command).

Link commands and MIH commands are also divided into local commands and remote commands, depending on the area to be propagated. Local MIH commands originate in upper layers and are transmitted to the MIHF (e.g., MIHF in a higher layer mobility management protocol or MIHF in a policy engine). The local link commands are generated at the MIHF to coordinate the lower layer entities and are passed to lower layers (e.g., the media access control at the MIHF or the physical layer at the MIHF). The remote MIH command is a command that occurs in the upper layers and is delivered to the remote peer stack. The remote link command is an instruction that occurs in the MIHF and is delivered to lower layers of the remote peer stack.

Finally, the information service provides detailed information about the network needed for network discovery and selection, and should be accessible from any network. The information service allows the mobile station to acquire information for network selection before handover and obtains available information through information query to reduce delay after handover.

Information services include the following information elements (IEs):

- Link access parameter

- Security mechanism

- IP configuration methods

- Location

- Provider and other Access Information.

- Cost of link

However, the conventional information service according to IEEE 802.21 does not provide a service for IE with potential change. That is, the information service according to the conventional IEEE 802.21 provides mostly static information only, and dynamic information on other access networks such as available resource level, state parameter and dynamic statistics, Must be obtained directly from the peer-to-peer network.

Also, in the conventional information service providing method, it is required to provide information on the performance of neighboring different PoSs, for example, channels supported by different PoSs for connection to a selected network, , Dynamic link layer parameters could only be obtained through direct communication with the network that wants to connect because the information service does not provide a dynamic IE as described above.

That is, since the information service does not provide a dynamic IE (Dynamic IE), in order to perform an operation requiring a dynamic IE upon handover, it must be performed only through direct communication with a counterpart network, There has been a problem of repetition and process delay, but there is no perception of such a problem.

In order to solve the above problems, an object of the present invention is to provide an information service providing method capable of providing not only a static IE but also a dynamic IE (dynamic IE).

Another object of the present invention is to provide a method for updating a dynamic IE in order to increase the performance of an improved information service providing up to dynamic IE as described above.

Another object of the present invention is to provide an improved IE format in order to provide such an improved information service providing method. More specifically, the present invention classifies IE types and, in the case of dynamic IEs, We want to provide a method to determine whether to update.

According to an aspect of the present invention, there is provided a method of providing an improved information service. Such an improved information service providing method includes transmitting a request message for an information element (IE), and receiving a response message for the request message. At this time, the information element may include type information of the information element, and the type information may indicate whether the information element is the dynamic information element or the static information element.

Further, in the improved information service providing method according to the present embodiment, when the information element is a dynamic information element, the information element includes validity information of the dynamic information element. The validity information of the dynamic information element may include time information. The time information may include a time from when the dynamic information element is created or updated and a time point when the dynamic information element is stored in the information server And information about one or more of the time at which the dynamic information element was created or updated and the time at which the dynamic information element was stored in the information server . In the former case, the time information can be used for judging the validity of the dynamic information element through comparison with a predetermined threshold value. In the latter case, the time information is obtained by comparing the difference between the current time and the time information with a predetermined threshold value Thereby making it possible to determine the validity of the dynamic information element. Accordingly, the present embodiment can maintain the reliability of each dynamic IE in implementing an improved information service providing method that provides a dynamic IE.

According to another aspect of the present invention, there is provided a method of updating a dynamic information element (IE) including validity information. That is, the dynamic information element updating method according to the present embodiment includes checking the validity information and requesting the update of the dynamic information element if the dynamic information element is invalid. Here, when the dynamic information element is not valid, the time information included in the validity information may include a case where the time information included in the validity information is greater than or equal to a predetermined threshold value, and a case where decoding using the dynamic information element fails. The update request step may be performed using a first primitive including at least one of the dynamic information element to be updated and the cause information of the update request.

Meanwhile, the dynamic information element updating method according to the present embodiment further includes receiving response information for the update request. In this case, the response information may be received using a second primitive including information indicating whether the update of the dynamic information element is successful, and a dynamic information element updated when the update of the dynamic information element is successful.

In such an embodiment, the dynamic information element may comprise information for heterogeneous network handover (MIH). In this case, it is assumed that the update requesting step and the response receiving step are performed in a multi-mode mobile terminal, wherein the response to the update request is transmitted to the information server, And may include a dynamic information element updated through a query to a new access point for a manganese handover. According to another embodiment of the present invention, it is assumed that the update requesting step and the response receiving step are performed in an entity managing the dynamic information element, May be received from the new access point for the heterogeneous network handover for updating the information element. In addition, the predetermined entity may be an information server.

According to the embodiments of the present invention as described above, a dynamic IE (dynamic IE) can be stably provided while an existing information service provides only a static IE.

Further, in order to increase the performance of the improved information service that provides such dynamic IE, the reliability of the information service can be improved by providing a method of updating the dynamic IE.

Embodiments of the present invention provide an improved IE format for providing an improved information service providing method, allowing a person skilled in the art to easily implement the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. For example, the following description illustrates the format of specific parameters for performing the dynamic IE update procedure, but the specific format of the parameters may be changed as long as the concept of the present invention is maintained.

In some instances, well-known structures and devices are omitted or shown in block diagram form around the core functions of each structure and device in order to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

As described above, an embodiment of the present invention provides an information service providing method capable of providing not only a static IE but also a dynamic IE (dynamic IE). Hereinafter, the format of the improved IE according to an embodiment of the present invention will be described first for providing such an information service.

According to an embodiment of the present invention, in this example, for an information service providing not only a static IE but also a dynamic IE, a means for discriminating whether each IE is a static IE or a dynamic IE is provided. Also, in the case of the dynamic IE, since the corresponding IE may not be valid due to time lapse or the like, in this example, a validity determination means for determining whether or not the update is described later is provided.

The format of the improved IE for this can be expressed as follows.

Type: information element type Length: information element length Validity Information: Information indicating the validity of the information element IE Value ... IE Value ...

That is, in Table 1, "Type" indicates whether the corresponding IE is a dynamic IE or a static IE, and "Validity Information"

The validity information may be expressed as a time value. The time value at this time may be at least one of the time from when the dynamic IE is created or updated and the time from when the dynamic IE is stored in the information server. Accordingly, validation of the information can be performed by determining whether the time value is equal to or greater than a predetermined threshold value. That is, if the time value is equal to or greater than the predetermined threshold value, it is determined that the corresponding IE is invalid and an update process described later can be performed. If the time value is less than the predetermined threshold value, it can be determined that the corresponding IE is valid.

Hereinafter, for convenience of explanation, it is assumed that the validity information indicates the elapsed time from the time when the IE was last updated. If the validity information indicates the elapsed time since the IE was last updated, the above table 1 may be expressed as follows.

Type: information element type Length: information element length Time Value: Time elapsed since the information element was last updated IE Value ... IE Value ...

As another example of this embodiment, the IE format can be expressed as follows, which represents an example of the PoA system information IE.

IE type
(Type of Information elements) Name of IE
(Name of information elements) Time value
(Time Value) Explanation
(Description) Data type name
(Data type name) PoA specific information elements (PoAs) DYNAMIC: (D) TYPE_IE_SYSTEM_INFORMATION Time (ms) System information supported by the link layer of a given PoA
(System information supported by the link layer of a given PoA) SYSTEM_INFORMATION

Type designation
(Type Name) Derived form
(Derived Form) Justice
(Definition) Effective range
(Valid Range) SYSTEM_INFORMATION SEQUENCE
(INFORMATION_TYPE, MAC_ADRESS, PARAMETERS) Type indicating system information
(A type to represent system information) N / A PARAMETERS Choice
(DCD & UCD, SIB (s), SYSTEM_PARAMETERS) The system parameters supported by the link layer of a given PoA
(System Parameters supported by the link layer of a given PoA) System parameter value
(Value of system parameters)
(E.g., IEEE 802.16-DCD & UCD, 3GPP-SIB (s), 3GPP2-SYSTEM_PARAMETERS)

In Table 3, the IE type field can be used as a type separator of the IE, and can distinguish a dynamic IE as a "D" and a static IE as an "S". Table 3 shows a case where the type of IE indicates a dynamic IE. IEs classified as dynamic IEs can be managed by time values as validity information of corresponding IEs as shown in Table 3. [ That is, dynamic IEs can indicate the validity or reliability of information through time values.

In this example, the time value increases from the time when the corresponding IE is generated or updated, and when the time value reaches a predetermined time value threshold for each IE, the terminal or the information server can direct a task for updating the corresponding IE. As another example, the time value may be generated or updated, and the validity of the corresponding IE may be estimated through comparison with the current time. At this time, the information on the current time point may be known by the subject determining the validity of the IE, or may be received in the received message or primitive including the IE.

Meanwhile, a method of performing update on a dynamic IE among IEs having the above-described format according to another embodiment of the present invention will be described as follows.

1 is a diagram for explaining a method of updating a dynamic information element according to an embodiment of the present invention.

When receiving an information service including a specific IE from a terminal or an arbitrary entity, the type of the received IE is confirmed (S101). In the present embodiment, the IEs include a type field indicating whether the IE is a dynamic IE or a static IE, as shown in the examples of Tables 1 to 3 above.

If the received IE indicates a dynamic IE, validity of the received IE is determined using validity information, for example, information on generation / update time of the IE (S102). The validity determination at this time may be determined depending on whether or not the time information indicates a predetermined threshold value or more.

If it is determined in step S102 that the reception IE is invalid, the update of the IE may be requested (S103). Such an update of IE may be performed by a terminal, an information server, or any entity that manages the validity of such a dynamic IE. The entity that requested the update as described above in step S103 may receive the response information therefrom (S104).

The primitives corresponding to the IE update request and the response information received as a response thereto will be described in more detail as follows.

First, the Update_Info_Query.request primitive will be described as an example of a primitive for requesting an update of the IE as in step S103 of FIG.

Update_Info_Query.request can be used by each access point or mobile terminal to request the information server to update the changed IEs. The MIH of each access point or mobile terminal and the network entity (IP or transport layer, network information collector, analyzer) within each access point can communicate with the information server via the Update_Info_Query.request .

Meanwhile, the base station may transmit its load distribution information over time to a policy engine that determines a handover through the primitive, thereby expecting an efficient load distribution effect. In addition, the MS can receive the reliable IE before starting the handover through updating the information using the primitives of the respective access points.

Such an Update_Info_Query.request primitive may contain information such as the following table

designation
(Name) type
(Type) Effective range
(Valid Range) Explanation
(Description)
Source identifier
(Source Identifier)

Identifier
(Identifier)

Identifier of the entity from which this query originated
(The identifier of the entity is the request is initiated)

Destination identifier
(Destination Identifier)

Identifier
(Identifier)

Destination identifier of this query
(The destination identifier of the request)

Information query parameters
(InfoQuery Parameter)

Query type specific parameters
(Query Type Specific Parameter)

N / A
Query type specific parameters
(Query type specific parameter)
(For example, UCD / DCD)
(E.g., PoA_System Parameters)

Reason code
(Reason code)

enumeration
(Enumerate)

0: Time value expired
(Time value expired)
1: Invalid value
(invalie value)
2-7: Reserved

In Table 4, an information element to be updated may be inserted into the information query parameter (InfoQueryParameters) information element. In the case of the broadband wireless access system, the DCD and UCD information changed from the MAC layer may be included in the POA_SystemParameters and may include any changed information related to handover or network connection. In addition, the primitive may request an update including the broadband wireless access system as well as system parameters for any other candidate system.

Next, the Update_Info_Query.response primitive will be described as an example of a primitive for responding to an update request of the IE as in step S104 of FIG.

The Update_Info_Query.response primitive is used as a response message to date_Info_Query.request and can be used to transmit the result of whether or not the information update has been successfully performed in the information server or any entity performing management of the dynamic IE . An example of the Update_Info_Query.response primitive may be represented as follows.

designation
(Name) type
(Type) Effective range
(Valid Range) Explanation
(Description)
Source identifier
(Source Identifier)
Identifier
(Identifier)
Enter this query
The identifier of the tee.
(The identifier of
entity where the
request is initiated)
This field may contain an identifier of the information server,
(This field may be filled with the identifier of the information server)

Destination identifier
(Destination
Identifier

Identifier
(Identifier)

Destination identification of this response
character
(The destination
identifier of the
response)

Information query parameters
(InfoQuery Parameter)
Query type specific parameter
foundation
(Query Type Specific
Parameter)
N / A
Updated information elements
(Set to null if status code = 1 below)
Status code
(Status code)
enumeration
(Enumerate)

0: Success
(Success)
1: failure
(Fail)

Information Update Result

As shown in Table 5, the Update_Info_Query.response primitive may include a status code, which can inform the success or failure of the update of the dynamic IE. Also, an updated IE can be inserted into the information query parameter (InfoQueryParameters) information element. However, if the status code indicates failure (i. E., 1), the information query parameter may be set to null.

The Update_Info_Query.request primitive and Update_Info_Query.response primitive described above may be used for queries / responses within a particular MIH protocol, or may be used for communication between MIH protocols.

Hereinafter, as a concrete embodiment of the present invention, before a multi-mode mobile terminal performing communication with an access point using IEEE 802.11 performs a handover as a new access point in the IEEE 802.16 network, A description will be given of a specific example in which a handover is performed using the information service. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description is merely exemplary in order to clearly understand the embodiments of the present invention described above and includes details not specifically related to the practice of the present invention in a specific operation.

2 is a diagram for explaining a method of acquiring an information service for handover to a new access point by a multimode mobile terminal according to an embodiment of the present invention.

In FIG. 2, a Multimode MN or Multimode STA, an Information Server, and each Access Point include an MIH Function (MIH Function) entity marked "MIH ". This MIHF is responsible for exchanging MIH primitives between the mobile terminal, the information server, and the upper layer indicated as "MIH user " and the lower layer indicated as " MAC " The upper layer indicated as "MIH user " represents an upper layer entity of the third or higher layer, and corresponds to a subject using the service by the MIHF (hereinafter referred to as" MIH user ").

In FIG. 2, the MIHF of the mobile terminal is informed from the link layer (802.11 MAC) responsible for the current communication method that the currently connected WLAN link (IEEE 802.11) is to be disconnected after a predetermined time, (1). Accordingly, the MIHF users of the mobile station transmits a "remote link_going_down" primitive indicating that the connection is to be remotely released to the MIH of the current access point (2). At the same time as step 2 or independently of step 2, the MIH users of the mobile terminal instructs to scan another link to perform handover to another network, which is transmitted to the corresponding interface link layer through the MIHF, Scan is performed (3). In this example, a broadband wireless access link (IEEE 802.16) is detected as a new access point by the detection procedure of step 3. The information indicative of the resultant broadband wireless access link detected through the detection procedure of step 3 is transmitted from the link layer (802.16 MAC) for the corresponding broadband wireless access link in the mobile terminal to the MIHF , And MIH users (4).

The mobile terminal then performs a procedure for receiving an information service for handover to a new access point (IEEE 802.16).

In the meantime, steps 5 to 7 described below are specific procedures that are performed independently of the above-described steps 1 to 4. In this embodiment, a procedure for notifying the information server of information changed at a specific connection point .

When there is a change in a specific physical layer parameter at a specific connection point, for example, a new connection point (IEEE 802.16) in this example, the corresponding connection point can inform the information server of the changed contents.

To this end, the link layer (MAC) of the broadband wireless access system (IEEE 802.16) transmits information about physical layer parameters such as UCD and DCD to the MIHF of the broadband access system (5). The MIHF or the MIHF (MIH user) who receives the changed information stores the changed information in the specific repository through the information update request and response to the information server (6, 7).

As described above, steps 5 to 7 of updating the system parameters or the handover-related parameters to the information server by the broadband wireless access system (IEEE 802.16) can be performed regardless of the other series of processes. That is, the query / response process of step 6 and step 7 can be performed any time the parent entity is notified of the changed information of the link layer.

The procedure of steps 8 to 11 will be described below. The procedure is as follows. The mobile terminal requests handover and connection information to the information server through the current access point (IEEE 802.11) It represents a stop to receive information. In addition, the procedure of steps 12 and 13 described below is a procedure in which the mobile terminal requests information directly to the information server without going through the current access point (IEEE 802.11) and obtains the information. In this manner, the processes of steps 8 to 11, which are information acquiring processes using the current access point, can be performed independently of the processes of step 12 and step 13, which are the processes of acquiring information directly with the information server.

First, the process of steps 8 to 11 will be described.

The mobile terminal may request more information about the link with the new access point (IEEE 802.16) acquired by step 4, such as system parameters (UCD, DCD, SIB, system parameters) And transmits MIH_Get_Information.request to the MIHF of the current connection point (IEEE 802.11) (8). The current access point relays the query by the MIH_Get_Information.request to the information server (9) so that the mobile terminal can acquire information for handover to a new access point (IEEE 802.16).

In response to this, the information server inserts the response information of the inquiry from the mobile terminal into the MIH_Get_Information.response primitive and transmits it to the mobile terminal (10, 11). That is, the information server transmits a response to the inquiry of the mobile station through the MIH_Get_Information.response primitive to the current access point (IEEE 802.11) of the mobile station (10), and the response information is relayed to the mobile station by the current access point (11). The control information necessary for the handover or connection held by the information server may include the physical layer parameters (UCD, DCD) updated by the steps 5 to 7 according to the present embodiment.

Hereinafter, the procedure of step 12 and step 13 will be described.

The MIHF of the mobile terminal can acquire the updated information of the new access point (IEEE 802.16) by transmitting the MIH_Get_Information.request directly to the information server using the third layer and receiving the MIH_Get_Information.response directly from the information server , 13).

Then, the MIHF of the mobile station transmits a Link Connect command for performing a second layer connection with a link of a new access point (IEEE 802.16) based on the obtained information (14). At this time, the MIHF of the mobile terminal includes the information obtained through the process of steps 8 to 11, which is the information acquisition process through the current access point, or the processes of steps 12 and 13, Lt; / RTI >

In this case, the base station of the broadband wireless access system can transmit information on the frame structure and bandwidth allocation for the data burst by broadcasting DL-MAP and UL-MAP to the mobile station every frame (15). The mobile station which has acquired the MAP information for the downlink and the uplink grasps the MIH capability information (MIH capability) information through the DCD already acquired through the information server and grasps the initial ranging period through the MAP information , Ranging can be performed. Accordingly, the mobile terminal performs a procedure for the second layer connection to the base station of the new access point (16).

3 illustrates a method for acquiring an information service including a dynamic IE in order to handover to a new access point according to a preferred embodiment of the present invention and updating the acquired dynamic IE if the acquired dynamic IE is not valid Fig.

3, the multi-mode mobile terminal, the information server, and the entities included in each access point are the same as those in FIG. 2, and the present embodiment described with reference to FIG. 3 also illustrates a case where a mobile terminal communicates with an IEEE 802.11 network (IEEE 802.16) as a new access point while acquiring the information service from the information server.

Steps 1 to 4 in this embodiment are procedures for discovering that the mobile terminal will perform a handover to the broadband wireless access system through link detection. The procedure is the same as in the embodiment described above with reference to FIG. 2, Is omitted.

In this embodiment, the IE management procedure by the information server can be performed as shown in FIG. 3 independently of the search process for the new access point of the mobile terminal. That is, in the present embodiment, the IE includes a dynamic IE and a static IE, and may include validity information in the case of a dynamic IE, for example, a time tag indicating elapsed time information from the generation / update time of the corresponding IE . The information server manages the dynamic IE using the time tag. Specifically, when the information server determines that the corresponding dynamic IE is invalid through the management of the time tag of a specific dynamic IE, the information server may perform a process of updating the corresponding IE. However, such IE management may be performed by any entity capable of performing the above-described functions other than the information server.

Steps 5 to 8 show a procedure in which the mobile terminal requests handover and connection information to the information server through the current access point.

More specifically, the mobile terminal transmits more information about the link with the new access point (i.e., the broadband wireless access system) acquired in step 4, for example, the system parameters (UCD, DCD, SIB, system parameters) To request the same information, MIH_Get_Information.request is transmitted to the current access point (IEEE 802.11) (5). The current access point relays the query by the MIH_Get_Information.request to the information server and requests information for handover to the new access point (6).

In response to this, the information server transmits the response information for the inquiry from the mobile station to the mobile station by including it in the MIH_Get_Information.response primitive (7, 8). That is, the information server transmits a response to the inquiry to the current access point through the MIH_Get_Information.response primitive (7), and the response information is relayed to the final mobile terminal and the transmission is completed (8). In the present embodiment, the dynamic IE among the IEs included in the MIH_Get_Information.response primitive in steps 7 and 8 may include a time tag indicating validity information of the corresponding IE as described above.

The mobile station receiving the IE including the validity information of each IE can determine whether the corresponding IE is valid by using the validity information of each IE. The validity determination at this time is based on whether the validity information of the IE is a value indicating the elapsed time from the time when the corresponding IE is generated / updated, and whether the time value is greater than or equal to a predetermined threshold value. That is, if the time value is less than the predetermined threshold value, it is determined that the corresponding IE is valid. Otherwise, if the time value is equal to or greater than the predetermined threshold value, it is determined that the corresponding IE is invalid, can do.

Meanwhile, in another embodiment of the present invention, the validity information may be a time value indicating a time when the corresponding IE is generated / updated. In this case, the mobile terminal receiving the message can determine whether the corresponding IE is valid by using whether the difference between the current time and the time value is equal to or greater than a predetermined threshold value. At this time, the current time information may be known in the terminal or may be acquired through the current time value information included in the received MIH_Get_Information.response primitive. In this case, it is also possible to perform an IE update process such as when the IE is determined to be invalid.

Steps 9 to 13 show the process of updating the dynamic IE according to the present embodiment. Specifically, a mobile terminal that has determined that the received dynamic IE is invalid may transmit the Update_Info_Query.request primitive to the information server via the current access point (9, 10). At this time, the Update_Info_Query.request primitive can use a primitive as shown in Table 4 above.

In response, the information server performs a process of acquiring the information element again from the base station for updating the information (11). However, this step may be omitted if the information server can not perform the procedure for updating the IE. If the IE update procedure fails as described above, it may indicate the status information of the response information for the update as described above with reference to Table 5. [

On the other hand, if the information server succeeds in updating the corresponding IE from the corresponding base station in step 11, the information server may transmit the updated IE to the mobile terminal through the current access point by including the updated IE in the Update_Info_Query.response primitive (12, 13). That is, the information server transmits a response to the query of the mobile terminal to the current access point through the Update_Info_Query.response primitive (12), and the response information is relayed to the final mobile terminal and the transmission is completed (13).

The Update_Info_Query.response primitive used at this time may use the primitive described in Table 5 above. That is, if the step 11 is omitted as described above, the status code of the Update_Info_Query.response primitive described in Table 5 may be set to 1 to indicate that the update of the corresponding IE has failed.

The subsequent steps 14 through 16 are the same as the steps 14 through 16 of FIG. 2, which are performed for handover to a new access point using the acquired information as described above. However, in the present embodiment, since the process has acquired not only the static IE but also the dynamic IE, the efficiency of the handover can be increased compared to the conventional method. In addition, the accuracy of each dynamic IE can be increased through the dynamic IE update process of steps 9 to 13.

However, if the process of step 11 fails and the update of the dynamic IE fails, the process of establishing a connection to a new access point through steps 14 to 16 may not occur. In this case, the mobile terminal can repeatedly perform the updating process of the corresponding IE.

FIG. 4 is a flowchart illustrating a method for acquiring an information service including a dynamic IE to handover to a new access point according to another preferred embodiment of the present invention. When a decoding process using the obtained dynamic IE fails, And a method for performing update of the corresponding IE.

4, entities included in the multimode mobile terminal, the information server, and the respective access points are the same as those in FIG. 2, and the present embodiment described with reference to FIG. 4 also illustrates a case where a mobile terminal communicates with an IEEE 802.11 network (IEEE 802.16) as a new access point while acquiring the information service from the information server.

Steps 1 to 4 in this embodiment are procedures for discovering that the mobile terminal will perform a handover to the broadband wireless access system through link detection. The procedure is the same as in the embodiment described above with reference to FIG. 2, Is omitted.

Steps 5 to 8 are steps 5 to 8 in the embodiment described above with reference to FIG. 3 as a procedure for the mobile terminal to acquire information on the handover and connection from the information server via the current access point (IEEE 802.11 network) And a description thereof will be omitted.

Hereinafter, the present embodiment will be described from step 9 of FIG. 4 as follows.

The MIHF of the mobile terminal transmits a link connection command for performing the second layer connection to the link of the new access point (broadband wireless access system) based on the information obtained from the information server through steps 5 to 8 (9). At this time, the MIHF or MIHF user of the mobile terminal can transmit the link connection command including the information including the dynamic IE acquired from the information server. In this case, the base station of the broadband access system can transmit DL-MAP and UL-MA to the mobile terminal every frame to transmit information on the frame structure and band allocation for the data burst (10).

On the other hand, in the present embodiment, it is assumed that a specific dynamic IE among the IEs acquired through the steps 5 to 8 is an elapsed IE or a DL / UL MAP decoding using the IE for some other reason fails (11 ). In this case, in this embodiment, the terminal proposes to perform the procedure for updating the corresponding IE in the information server using the current connection point (IEEE 802.11 network).

That is, if the DL / UL MAP decoding using the specific IE fails in step 11, the mobile station may transmit a primitive requesting update of the corresponding IE together with an indicator indicating that the IE is inappropriate to the current access point 12). That is, in step 12, the mobile station can transmit the Update_Info_query.request primitive as shown in Table 4. At this time, the reason code (Reason code) of the Update_Info_query.request primitive is set to 1 to indicate that the corresponding IE is invalid . The Update_Info_query.request primitive is then passed to the information server (13) under the relay of the current access point.

Accordingly, the information server can update the corresponding IE and transmit the Update_Info_query.response primitive including the updated dynamic IE to the mobile terminal through the current access point (14, 15).

The terminal according to the present embodiment is assumed to be a terminal that has failed to acquire system parameters for MAP decoding or initial network entry such as UCD / DCD in advance.

FIG. 5 is a diagram for explaining a method in which an information server periodically checks validity information of a dynamic IE, or when an event occurs, and performs an IE update process on its own according to another preferred embodiment of the present invention.

In FIG. 5, the multimode mobile terminal, the information server, and the entities included in each access point are the same as those of FIG. 2, and the present embodiment described with reference to FIG. 5 also illustrates a case where the mobile terminal communicates with the IEEE 802.11 network (IEEE 802.16) as a new access point while acquiring the information service from the information server.

Steps 1 to 4 in this embodiment are procedures for discovering that the mobile terminal will perform a handover to the broadband wireless access system through link detection. The procedure is the same as in the embodiment described above with reference to FIG. 2, Is omitted.

Hereinafter, the process of step 5 and the following will be described.

The steps 5 to 7 of FIG. 5 may be performed independently of the steps 1 to 4. FIG. That is, in the present embodiment, it is proposed that the information server periodically checks validity information of each dynamic IE, for example, elapsed time value information from the time when the IE is generated / updated at the occurrence of a specific event (5). If, as a result of the check, the time values are equal to or greater than a predetermined threshold value, step (6) for updating the corresponding IE may be performed.

As an alternative to the present embodiment, in the example where the information server periodically performs the update process of the dynamic IEs, the process of step 5 may be omitted. In this case, the information server can perform the procedure for updating all dynamic IEs regardless of whether the dynamic IE is valid (6).

In any case, the information server successfully completing the step 6 can update the corresponding dynamic IE using the obtained information (7).

In this embodiment, the case where the subject performing the dynamic IE update procedure at the time of occurrence of the periodic or specific event is the information server has been described. However, the subject that manages and updates the dynamic IE periodically like this can be managed in addition to the information server It may be any entity.

The processes of steps 8 to 11, steps 12 and 13, and steps 14 to 16 are the same as those described above with reference to FIG. 2, and a detailed description thereof will be omitted do. However, in this embodiment, the information obtained through inquiry to the information server includes a dynamic IE, which may be a dynamic IE updated through the process of steps 5 to 7 above.

The foregoing description of the disclosed preferred embodiments of the invention as set forth above is provided to enable any person skilled in the art to make or use the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

According to the embodiments of the present invention as described above, a dynamic IE (dynamic IE) can be stably provided while an existing information service provides only a static IE.

Further, in order to increase the performance of the improved information service that provides such dynamic IE, the reliability of the information service can be improved by providing a method of updating the dynamic IE.

Embodiments of the present invention provide an improved IE format for providing an improved information service providing method, allowing a person skilled in the art to easily implement the present invention.

1 is a diagram for explaining a method of updating a dynamic information element according to an embodiment of the present invention.

2 is a diagram for explaining a method of acquiring an information service for handover to a new access point by a multimode mobile terminal according to an embodiment of the present invention.

3 illustrates a method for acquiring an information service including a dynamic IE in order to handover to a new access point according to a preferred embodiment of the present invention and updating the acquired dynamic IE if the acquired dynamic IE is not valid Fig.

FIG. 4 is a flowchart illustrating a method for acquiring an information service including a dynamic IE to handover to a new access point according to another preferred embodiment of the present invention. When a decoding process using the obtained dynamic IE fails, And a method for performing update of the corresponding IE.

FIG. 5 is a diagram for explaining a method in which an information server periodically checks validity information of a dynamic IE, or when an event occurs, and performs an IE update process on its own according to another preferred embodiment of the present invention.

Claims (17)

Transmitting a request message for a predetermined information element (IE) from a first entity to a second entity; And Receiving, at the first entity, a response message for the request message from the second entity, The information element including type information of the information element, Wherein if the information element is a Dynamic Information Element, the information element includes validity information of the dynamic information element. The method according to claim 1, Wherein the type information indicates whether the information element is the dynamic information element or a static information element. The method according to claim 1, Wherein the validity information of the dynamic information element includes time information, Wherein the time information comprises information on at least one of a time from when the dynamic information element is created or updated and a time from when the dynamic information element is stored in the information server. The method of claim 3, Wherein the time information is used for judging the validity of the dynamic information element through comparison with a predetermined threshold value. The method according to claim 1, Wherein the validity information of the dynamic information element includes time information, Wherein the time information comprises information on at least one of a time at which the dynamic information element is created or updated and a time at which the dynamic information element is stored in an information server. 6. The method of claim 5, Wherein the time information is used for determining the validity of the dynamic information element by comparing the difference between the current time and the time information to a predetermined threshold. A method for updating a dynamic information element (IE) including validity information, Checking the validity information in a first entity and requesting the second entity to update the dynamic information element if the dynamic information element is not valid; And And receiving response information for the update request from the second entity in the first entity. 8. The method of claim 7, The dynamic information element including at least one of a case where the time information included in the validity information is not less than a predetermined threshold value and a case where decoding by using the dynamic information element fails, How to update. 9. The method of claim 8, Wherein the update request step comprises: The dynamic information element to be updated, and the cause information of the update request, and a first primitive including at least one of the dynamic information element to be updated and the cause information of the update request. 8. The method of claim 7, The response information includes: Wherein the dynamic information element is received using information indicating whether the update of the dynamic information element is successful and a second primitive including an updated dynamic information element if update of the dynamic information element is successful. 8. The method of claim 7, Wherein the dynamic information element comprises information for heterogeneous network handover (MIH). 12. The method of claim 11, Wherein the response to the update request comprises a dynamic information element that the information server has updated via a query to a new access point for the heterogeneous network handover. 12. The method of claim 11, Wherein a response to the update request is received from a new access point for the heterogeneous network handover for updating the dynamic information element. 8. The method of claim 7, And the second entity is an information server. 8. The method of claim 7, Wherein the first entity is a mobile terminal. The method according to claim 1, And the second entity is an information server. The method according to claim 1, Wherein the first entity is a mobile terminal.

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