KR101302113B1 - Apparatus and method for executing of handover in broadband complex radio access network - Google Patents

Abstract

The present invention relates to an apparatus and a method for performing a handover in a broadband hybrid wireless access network, wherein the broadband wireless access system is configured to notify a higher layer 2 node of a call establishment request generation when a call setup is requested from a terminal. Handover by selecting a wireless access network to serve the terminal through user group classification, including a node and a layer 2 node that performs user group classification for the terminal and determines the subject of call establishment according to the classification result. This can prevent unnecessary IP address assignment procedures and routing path update procedures.

Broadband Mobile Communication System, Wireless Access Network, Handover

Description

Apparatus and method for performing handover in broadband composite wireless access network {APPARATUS AND METHOD FOR EXECUTING OF HANDOVER IN BROADBAND COMPLEX RADIO ACCESS NETWORK}

1 is a schematic diagram of a broadband wireless access network according to the present invention;

2 is a block diagram of a layer 1 node in a broadband wireless access network according to the present invention;

3 is a block diagram of a layer 2 node in a broadband wireless access network according to the present invention;

4 is a diagram illustrating a call setup procedure of a layer 1 node in a broadband wireless access network according to an embodiment of the present invention;

5 is a diagram illustrating a call setup procedure of a layer 2 node in a broadband wireless access network according to an embodiment of the present invention;

6 is a diagram illustrating a handover processing procedure of a layer 2 node in a broadband wireless access network according to an embodiment of the present invention;

7 is a diagram illustrating signal exchange when a terminal performs handover in a broadband wireless access network according to the first embodiment of the present invention; and

8 is a diagram illustrating signal exchange when a terminal performs handover in a broadband wireless access network according to a second embodiment of the present invention.

The present invention relates to a wireless access network of a broadband mobile communication system, and more particularly, to an apparatus and method for performing handover in a wireless access network having different hierarchical structures.

The structure of a broadband mobile communication system can be broadly classified into a back-bone network and a radio access network. The backbone network is a communication network serving as a center for providing a service, and is a communication network connecting the wireless access networks. For example, it means an internet network, a public switched telephone network (PSTN), or the like. In addition, the wireless access network is a communication network for connecting the backbone network and the user, and is generally configured by separating functions into a plurality of nodes.

The wireless access network according to the prior art is composed of three layers (eg, Node B, Radio Network Controller (RNC), Gateway GPRS Support Node (GGSN)). In addition, in the case of 3GPP LTE (3rd Generation Partnership Project Long Term Evolution), which is currently being standardized, the wireless access network has been discussed as a strong candidate for two-layer (eg, enhanced Node B, Access Gateway) structure. However, in the next generation wireless communication system, a converged structure in which various types of communication networks have an IP (Internet Protocol) network as a backbone network is considered, and thus there is a possibility that a one-layer wireless access network may appear.

Therefore, in future wireless communication systems, it is expected that wireless access networks having various hierarchical structures will be mixed. However, the environment in which the radio access networks of the various hierarchical structures are fixed and operated may bring great restrictions on compatibility with heterogeneous networks or existing systems. Accordingly, a form of a wireless access network having a structure in which the wireless access networks of the first and second layers are fused is considered. That is, a wireless access network that can operate in a one-layer or two-layer structure according to a service scenario or a system operator's request is considered.

 When operating in the two-layer wireless access network, there is a disadvantage that a transmission delay occurs due to communication between nodes. On the other hand, when operating as a one-layer wireless access network, a communication procedure between nodes in the wireless access network is simplified to enable a service having a low transmission delay to a user. However, in the hierarchical structure, since each node constitutes one subnet, when a handover occurs, a user is newly assigned an IP address and the handover procedure is updated by updating an end-to-end routing path. It has the disadvantage of being relatively complicated.

As described above, a broadband mobile communication system of a type in which the wireless access network of the one-layer structure and the two-layer structure is combined is considered. However, since there is no policy for establishing a wireless access network of one layer structure or two layer structure to a specific terminal, when a handover is performed in a wireless access network in which the first layer structure and the two layer structure are mixed. There is a problem that unnecessary IP address reset and routing path update occur.

Accordingly, an object of the present invention is to provide an apparatus and method for reducing performance degradation due to handover in a broadband wireless access network.

Another object of the present invention is to provide an apparatus and method for classifying user groups in a broadband wireless access network.

According to a first aspect of the present invention for achieving the above object, a broadband wireless access system, the first layer node to notify the upper layer 2 node of the call establishment request generation, when the call setup request from the terminal, and the terminal And a two-layer node for performing a user group classification for the user and determining a call setup execution subject according to the classification result.

According to a second aspect of the present invention for achieving the above object, in a broadband wireless access system, when a handover instruction message is received from a terminal, the layer 1 node transmits information of the terminal and target node information to an upper layer 2 node. And a second layer node for performing a user group reclassification for the terminal according to the user group to which the terminal belongs, when the second layer node handover of the terminal is not necessary.

According to a third aspect of the present invention for achieving the above object, in a broadband wireless access system, a layer 1 node device includes a wireless communication unit for communicating with a terminal and a higher layer 2 node when a call establishment request from the terminal occurs. A layer 2 node communication unit for notifying and receiving an IP address allocation instruction message from the layer 2 node, and a call setup processing unit for performing call setup of the terminal when the IP address allocation instruction message is received from the layer 2 node. It is characterized by including.

According to a fourth aspect of the present invention for achieving the above object, in a broadband wireless access system, a layer 2 node apparatus includes a user information manager that manages user information of a terminal, and a grouping that classifies the terminal with reference to the user information. And a call setup processing unit for determining a call setup subject of the terminal according to the classification result.

According to a fifth aspect of the present invention for achieving the above object, in a broadband wireless access system, a layer 1 node device includes a radio communication unit for communicating with a terminal and a higher layer 2 node when a handover instruction message is received from the terminal. And a layer 2 node communication unit for transmitting the terminal information and target node information.

According to a sixth aspect of the present invention for achieving the above object, in a broadband wireless access system, a layer 2 node device includes: a layer 1 node for receiving information and target node information of a terminal performing handover from a lower layer 1 node; A communication unit, a handover processing unit for controlling a user group reclassification for the terminal according to a user group to which the terminal belongs, when the terminal does not need a layer 2 node handover; Accordingly, it characterized in that it comprises a grouping unit for performing the user group classification of the terminal.

According to a seventh aspect of the present invention for achieving the above object, a method of operating a layer 1 node in a broadband wireless access system includes: checking a call establishment request occurrence from a terminal; And informing, and performing a call setup of the terminal when an IP address assignment instruction message is received from the layer 2 node.

According to an eighth aspect of the present invention for achieving the above object, a method of operating a layer 2 node in a broadband wireless access system includes a process of receiving notification of a call establishment request of a terminal from a layer 1 node, and user information of the terminal. And classifying a user group based on the result of the classification, and determining a subject for performing call setup based on the classification result.

According to a ninth aspect of the present invention for achieving the above object, a method of operating a layer 1 node in a broadband wireless access system includes: checking whether a handover instruction message is received from a terminal; And transmitting the information and the target node information.

According to a tenth aspect of the present invention for achieving the above object, a method of operating a layer 2 node in a broadband wireless access system includes: checking whether information of a terminal performing handover and target node information are received from a lower layer 1 node; A process of checking whether a layer 2 node handover of the terminal is required, and a process of reclassifying the user group for the terminal according to the user group to which the terminal belongs, if the layer 2 node handover is not required. Characterized in that it comprises a.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a description will be given of a technique for reducing performance degradation due to handover of a terminal through user grouping in a broadband access network. In the following description, an orthogonal frequency division multiplexing (OFDM) based communication system is described as an example, and may be similarly applied to other cellular communication systems.

In addition, in the following description, a wireless access network assumes a structure in which a first layer and a second layer structure are serviced in combination.

1 is a schematic diagram of a wireless access network in a broadband mobile communication system according to the present invention.

Referring to FIG. 1, a communication network of the broadband mobile communication system includes first layer nodes 120 and 130 and second layer nodes directly connected to the backbone network 110 based on a backbone network 100. And a terminal 140 that communicates wirelessly with the first layer nodes 120 and 130.

The backbone network 100 is a main communication network serving as a central part of the system, and is connected to the terminal 140 via the second layer node 110 and the first layer nodes 120 and 130.

The second layer node 110 determines a subject that performs call setup for the terminal 140 as a higher node of the first layer nodes 120 and 130 through user group classification. In addition, when a handover occurs in the terminal 140, it is determined whether the user group of the terminal 140 needs to be changed.

The first layer nodes 120 and 130 communicate directly with the terminal 140 and notify the second layer node 110 when a call establishment request and a handover request occur, and the second layer node 110 determines The call setup of the terminal 140 is performed and the backbone network 100 is directly connected to communicate with the terminal 140.

2 is a block diagram of a layer 1 node in a broadband mobile communication system according to the present invention.

As shown in FIG. 2, the first layer node includes a control unit 201, a call setup processing unit 203, a connection management unit 205, a handover processing unit 207, a backbone network communication unit 209, and a second layer node communication unit. 211, encoding and modulator 213, resource mapper 215, OFDM modulator 217, digital analog converter (DAC) 219, radio frequency (RF) transmitter 221 And an RF receiver 223, an analog digital converter (hereinafter referred to as an ADC) 225, an OFDM demodulator 227, a resource demapper 229, a demodulator, and a decoder 231. .

The controller 201 controls the overall function of the first layer node. For example, it controls communication with a backbone network, a layer 2 node, and a terminal, and controls functions of call establishment processing and handover of the terminal. In particular, according to the present invention, the second layer node controls a function for performing call setup for a terminal classified as a fixed user.

The call setup processing unit 203 processes a function for notifying the second layer node of the call setup request from the terminal. In addition, when an IP address assignment indication message is received from the layer 2 node, an IP (Internet Protocol) address is allocated to the terminal.

The connection manager 205 processes a function of maintaining information on a set call and maintaining a service for a connected terminal.

The handover processing unit 207 performs a function for handover. For example, a function for determining whether to perform handover of the terminal, providing information of neighboring layer 1 nodes to the terminal, transmitting session information according to handover, and notifying handover occurrence notification to the layer 2 node are processed.

The backbone network communication unit 209 processes a function for performing communication with the backbone network under the control of the control unit 201. The layer 2 node communication unit 211 processes a function for performing communication with the layer 2 node under the control of the controller 201. The backbone network communication unit 209 and the layer 2 node communication unit 211 may be configured as a single block, and in the present invention, the first layer node is connected to the backbone network and the layer 2 node, respectively. This is to indicate that communication can be performed.

The encoder and modulator 213 encodes and modulates data for transmission to the terminal in a corresponding manner. The resource mapper 215 maps data provided from the encoder and modulator 213 to a corresponding subcarrier resource. The OFDM modulator 217 converts the frequency domain signal mapped to the frequency resource provided from the resource mapper 215 into an inverse fast fourier transform (IFFT) operation and converts the signal into a time domain signal. The DAC 219 converts the digital signal provided from the OFDM modulator 217 into an analog signal. The RF transmitter 221 converts the baseband signal provided from the DAC 219 into an RF band signal and transmits it through an antenna.

The RF receiver 223 converts a signal of the RF band received through the antenna into a baseband signal. The ADC 225 converts an analog signal provided from the RF receiver 223 into a digital signal. The OFDM demodulator 227 converts the time domain signal provided from the ADC 225 into a frequency domain signal by performing a fast fourier transform (FFT) operation. The resource demapper 229 extracts data corresponding to the allocated resource from among data mapped on the frequency provided from the OFDM transformer 227. The demodulator and decoder 231 demodulates and decodes the data provided from the resource demapper 229 in a corresponding manner.

In the above configuration, the controller 201 may perform the functions of the call setup processor 203, the connection manager 205, and the handover processor 207. In the present invention, it is configured as a separate block for the purpose of distinguishing each function. Therefore, in actual implementation, all of them may be configured to be processed by the controller 201 or only some of them may be configured.

3 is a block diagram of a layer 2 node in a broadband mobile communication system according to the present invention.

As shown in FIG. 3, the second layer node includes a control unit 301, a user information management unit 303, a grouping unit 305, a call setup processing unit 307, a connection management unit 309, and a handover processing unit 311. ), A backbone network communication unit 313 and a layer 1 node communication unit 315.

The controller 301 controls the overall function of the second layer node. For example, it controls communication with a backbone network and a layer 1 node, and controls functions of call establishment processing and handover of a terminal. In particular, according to the present invention, the function for determining the subject of call establishment is controlled through user group classification.

The user information manager 303 manages information of terminals existing in a cell area managed by the layer 2 node. For example, the information includes information such as location information of the terminal, moving speed information, type of service in use, access time, and the like.

The grouping unit 305 receives the terminal information from the user information manager 303 and classifies the terminal into a mobile user group or a fixed user group when a specific terminal requests a call setup. The user group classification is performed by the criteria shown in Table 1 below.

Classifier

Mobile user
Fixed user
Access network Mobile communication network such as Mobile Celluar Network and Moving Network Communication network used in fixed space such as WLAN, Home Network Connection location Outdoor, subway, downtown street, airport etc Office building, house etc speed Pedestrian speed over Less than pedestrian speed Type of service Service sensitive to transmission delays such as VOD, Voice Call Less sensitive to transmission delays such as FTP

Here, the criteria shown in Table 1 may be applied independently or may be applied in combination of a plurality of criteria.

The call establishment processing unit 307 receives the user group classification information from the grouping unit 305 when the call establishment of the terminal is requested, and determines whether to process the call establishment directly or at the first layer node, and determines the determination. The call setup is performed according to the result. In other words, when the call setup is directly processed, that is, when the terminal is classified as a mobile user, an IP address is assigned to the terminal. In addition, when the call setup is handled by the first-layer node, that is, when the terminal is classified as a fixed user, a function for transmitting an IP address assignment indication message to the first-layer node is processed.

The connection manager 309 processes a function of maintaining information on a set call and maintaining a service for a connected terminal.

The handover processing unit 311 processes a function for handover of the terminal. It provides functions such as providing session information of a terminal handing over to a target node, updating a routing path with a terminal performing handover, and determining whether to perform a user group reclassification of the terminal performing the handover. In other words, when the terminal performs the handover between lower layer 1 nodes, that is, when the layer 2 node handover is not necessary, if the terminal belongs to the mobile user group, the routing path with the terminal is updated. On the other hand, if the terminal belongs to a fixed user group, the grouping unit 305 is controlled to perform a user group reclassification.

The backbone network communication unit 313 processes a function for performing communication with the backbone network under the control of the controller 301. The first layer node communication unit 315 processes a function for communicating with the first layer node under the control of the controller 301. The backbone network communication unit 313 and the first layer node communication unit 315 may be constituted by one block. In the present invention, the two layer nodes connect with the backbone network and the first layer node, respectively. To indicate that communication is to be performed.

In the above configuration, the controller 301 may perform the functions of the grouping unit 305, the call setup processing unit 307, the connection manager 309, and the handover processor 311. In the present invention, it is configured as a separate block for the purpose of distinguishing each function. Therefore, in actual implementation, all of them may be configured to be processed by the controller 201 or only some of them may be configured.

4 illustrates a call setup procedure of a layer 1 node in a broadband wireless access network according to an embodiment of the present invention.

Referring to FIG. 4, the first layer node determines whether a call establishment request from the terminal is received in step 401.

When the call setup request is made from the terminal, the first layer node proceeds to step 403 and notifies the second layer node that the call setup request has occurred.

In step 405, the first layer node determines whether an IP address allocation indication message is received from the second layer node. In other words, it is checked whether the terminal is to be serviced by a one-layer wireless access network.

When the IP address allocation instruction message is received, that is, when the terminal is serviced through the one-layer wireless access network, the first layer node proceeds to step 407 to allocate the IP address to the terminal.

Thereafter, the first layer node proceeds to step 409 to process signals transmitted and received between the terminal and the backbone network.

If the IP address assignment indication message is not received in step 405, that is, when the terminal is serving as a two-layer wireless access network, the first layer node proceeds to step 411 and a signal is transmitted and received between the terminal and the second layer node. Relays

The embodiment described with reference to FIG. 4 has described an operation procedure of a layer 1 node for performing communication over a wireless access network having a layer 1 or layer 2 layer according to a user group classification of the terminal. In this case, the signal transmitted and received may be divided into a control signal and a data signal to serve as a two-layer wireless access network regardless of the classification result. In this case, the first layer node processes only the data signal of the terminal.

5 is a flowchart illustrating a call setup procedure of a layer 2 node in a broadband wireless access network according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the layer 2 node determines whether call establishment request generation information of the terminal is notified from the layer 1 node in step 501.

If the call establishment request occurrence information is notified, the second layer node proceeds to step 503 and performs user group classification of the corresponding terminal. The user group classification is performed by the criteria shown in Table 1 above. Here, the criteria shown in Table 1 may be applied independently or may be applied in combination of a plurality of criteria.

After classifying the user group of the terminal, the layer 2 node proceeds to step 505 to determine whether the terminal is a mobile user group. That is, it is checked whether the terminal is to be serviced by a two-layer wireless access network.

If the terminal is a mobile user group, that is, if the terminal serves a two-layer wireless access network, the second layer node proceeds to step 507 and assigns an IP address to the terminal.

After allocating the IP address, the layer 2 node proceeds to step 509 to process signals transmitted and received between the terminal and the backbone network. At this time, the terminal communicates with the first layer node.

In step 505, if the terminal is not a mobile user group, that is, when the terminal is serving the terminal through a one-layer wireless access network, the second layer node proceeds to step 511 and transmits an IP address assignment indication message to the first layer node. do.

The embodiment described with reference to FIG. 5 has described an operation procedure of a layer 2 node for performing communication over a wireless access network having a layer 1 or layer 2 layer according to a user group classification of the terminal. In this case, the signal transmitted and received may be divided into a control signal and a data signal to serve as a two-layer wireless access network regardless of the classification result. In this case, regardless of the user group classification result, the layer 2 node processes the control signal of the terminal.

6 illustrates a handover processing procedure of a layer 2 node in a broadband wireless access network according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the layer 2 node determines whether a handover request of the terminal occurs in step 601. In this case, the occurrence of the handover is confirmed through a layer 1 node, and includes information of a terminal performing the handover, information of a target node, and the like.

When the handover request is generated, the second layer node proceeds to step 603 to determine whether the second layer node handover is necessary when the terminal is handed over. That is, it is determined whether the handover is performed between the lower layer 1 nodes and the handover to the layer 1 node that is adjacent to the adjacent layer 2 node through the target node information included in the handover indication message.

If the second layer node handover is necessary, that is, in case of a handover to a first layer node that is dependent on the adjacent second layer node, the second layer node proceeds to step 605 and the target second layer node is transferred to the target second layer node. Send session information. That is, the target layer 2 node performs a connection procedure with a terminal that enters through a procedure similar to the above call setup process, and provides a service based on the session information. In this case, the session information is managed by the second layer node in the case of a terminal serviced by a two-layer wireless access network, and is received from the first layer node in the case of a terminal serviced by a one-layer wireless access network.

On the other hand, if the second layer node handover is not necessary, that is, in case of handover between lower first layer nodes, the second layer node proceeds to step 607 to check whether the terminal is included in the mobile user group. That is, it is checked whether the terminal is serving as a wireless access network having a two-layer structure.

If the terminal belongs to the mobile user group, the layer 2 node proceeds to step 609 to update the routing path set as the serving layer 1 node to the target layer 1 node.

On the other hand, if the terminal is not a mobile user group, the layer 2 node proceeds to step 611 to perform user group classification for the terminal. The user group classification is performed by the criteria shown in Table 1 above. Here, the criteria shown in Table 1 may be applied independently or may be applied in combination of a plurality of criteria.

After performing the user group classification, the second layer node proceeds to step 613 to check whether the terminal is classified as a mobile user group.

If the terminal is a mobile user group, the layer 2 node proceeds to step 615 to allocate an IP address. In other words, it serves as a wireless access network in a two-layer structure.

On the other hand, if the terminal is not a mobile user group, the layer 2 node proceeds to step 617 and transmits an IP address assignment indication message and session information of the terminal to the target layer 1 node. That is, the target layer 1 node allocates an IP address to a terminal entering, and provides a service based on the session information.

The embodiment described with reference to FIG. 6 has described an operation procedure of a layer 2 node during handover of a terminal in a broadband wireless access network. At this time, the first layer node communicating with the terminal directly provides the occurrence information of the handover, the information of the terminal and the information of the target node to the second layer node, and terminates the connection with the terminal. In addition, when the terminal is serviced through a wireless access network having a one-layer structure, the first layer node provides session information of the terminal to the second layer node.

In addition, the above-described embodiment has described the operation procedure of the layer 2 node of the cell from which the terminal is leaving. At this time, the layer 2 node of the cell where the terminal enters from the neighbor cell performs a procedure similar to the call setup process such as receiving session information and terminal information from the layer 2 node of the neighbor cell and performing user group classification. In addition, the first layer node of the cell to which the terminal enters performs call setup of the terminal when an IP address allocation indication message is received from an upper two layer node.

FIG. 7 illustrates signal exchange when a terminal performs handover in a broadband wireless access network according to the first embodiment of the present invention. The following description describes an embodiment in which a UE, which has been serviced through a wireless access network having a one-layer structure, is handed over when a user group is changed in one two-layer node cell.

Referring to FIG. 7, the terminal 710 determines a target node to perform handover (step 701).

After determining the target node, the terminal 710 transmits a handover indication message to the serving first layer node 720 (step 703).

The serving first layer node 720 receiving the handover indication message transmits information of a target node, information of the terminal 710, and session information of the terminal 710 to the second layer node 740 ( Step 705). In this case, the handover indication message includes information on the target first layer node 730 to be handed over by the terminal 710.

The second layer node 740 that has received the target node information, the information of the terminal 710, and the session information confirms that the terminal 710 is a fixed user group. Therefore, by performing a user group reclassification on the terminal 710, it is confirmed that the terminal 710 needs to change the group to a mobile user (step 707).

The second layer node 740 that has determined the terminal 710 as a mobile user transmits an IP address assignment message to the terminal 710 (step 709). In this case, the IP address assignment message is transmitted through the target first layer node 730.

The terminal 710 assigned the new IP address transmits a binding update message to the backbone network 750 (step 711). Here, the binding update message is transmitted through the target primary node 730 and the layer 2 node 740.

Upon receiving the binding update message, the backbone network 750 updates the routing path with the terminal 710 (step 713).

8 illustrates signal exchange when a terminal performs handover in a broadband wireless access network according to a second embodiment of the present invention. The following description describes an embodiment in which a user group serviced by a wireless access network having a one-layer structure is handed over while a user group is maintained in one two-layer node cell.

Referring to FIG. 8, the terminal 810 determines a target node to perform handover (step 801).

After determining the target node, the terminal 810 transmits a handover indication message to the serving first layer node 820 (step 803). Here, the handover indication message includes information on the target first layer node 830 to be handed over by the terminal 810.

The serving first layer node 820 receiving the handover indication message transmits target node information, information of the terminal 810 and session information of the terminal 810 to the second layer node 840 (step 805). ). Here, the handover indication message includes information on the target first layer node 830 to be handed over by the terminal 810.

The second layer node 840 which has received the target node information, the information of the terminal 810, and the session information confirms that the terminal 810 is a fixed user group, and thus, the user group for the terminal 810. The terminal 810 confirms that the group change is not necessary as the mobile user by performing the reclassification (step 807).

The second layer node 840 which has determined the terminal 810 as a fixed user is an IP address assignment instruction message to the target first layer node 830 and the terminal 810 received from the serving first layer node 820. The session information is transmitted (step 809).

Upon receiving the IP address assignment indication message, the target first layer node 830 transmits an IP address assignment message to the terminal 810 (step 811).

The terminal 810 assigned the new IP address transmits a binding update message to the backbone network 850 (step 813). Here, the binding update message is transmitted via the target primary node 830.

Upon receiving the binding update message, the backbone network 850 updates the routing path with the terminal 810 (step 815).

7 and 8 have been described in the case where a handover is performed within one layer 2 node cell in a broadband wireless access network, that is, a layer 2 node handover is not required. If a handover of the layer 2 node is necessary, the layer 2 node corresponding to the serving cell transmits session information to the layer 2 node corresponding to the target cell and performs a procedure for terminating the connection with the terminal. In addition, the layer 2 node receiving the session information performs a connection procedure with the terminal entering the cell through a procedure similar to a call setup process and provides a service based on the session information.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, by selecting a wireless access network to serve a terminal through user group classification in a wireless access network in which layer 1 and layer 2 are mixed, unnecessary IP address assignment procedure and end-to-end routing path update procedure can be prevented during handover. Can be.

Claims (36)

In a broadband wireless access system, A layer 1 node that notifies the upper layer 2 node of the call establishment request generation when a call establishment request is made from a terminal; And a two-layer node for performing user group classification on the terminal and determining a subject for performing call setup according to the classification result. The method of claim 1, The second layer node, And classifying a user group by referring to at least one of an access network type, an access location, a moving speed, and a service type of the terminal. The method of claim 1, The first layer node, When the call setup of the terminal is performed, an IP (Internet Protocol) address is assigned to the terminal, the data transmitted and received between the terminal and the back-bone network is processed, If the call setup of the terminal is not performed, the system characterized in that for relaying data transmitted and received between the terminal and the layer 2 node. The method of claim 3, The second layer node, When the terminal is classified into a first group, an IP address is assigned to the terminal, And when the terminal is classified into a second group, transmitting an IP address allocation indication message of the terminal to the first layer node. 5. The method of claim 4, The first group is a group of terminals having mobility, The second group is a group of terminals having a fixed or nomadic characteristic. In a broadband wireless access system, A first layer node transmitting information of the terminal and target node information to a higher layer 2 node when a handover instruction message is received from the terminal; And a layer 2 node for performing a user group reclassification on the terminal according to the user group to which the terminal belongs, if the layer 2 node handover of the terminal is not necessary. The method according to claim 6, The second layer node, If the terminal belongs to the first group, update the routing path with the terminal, And when the terminal belongs to the second group, performing user group reclassification on the terminal. 8. The method of claim 7, The first group is a group of terminals having mobility, The second group is a group of terminals having a fixed or nomadic characteristic. 8. The method of claim 7, The second layer node, And classifying a user group by referring to at least one of an access network type, an access location, a moving speed, and a service type of the terminal. The method according to claim 6, The second layer node, And when the information of the terminal entering from the cell of the neighboring layer 2 node is received, classifying the user group of the terminal entering. In a layer 1 node device in a broadband wireless access system, A wireless communication unit for communicating with a terminal, A layer 2 node communication unit for notifying a higher layer 2 node when a call establishment request from the terminal is generated and receiving an IP (Internet Protocol) address assignment instruction message from the layer 2 node; And a call setup processor configured to perform call setup of the terminal when the IP address assignment instruction message is received from the layer 2 node. 12. The method of claim 11, When the call setup of the terminal is performed, further comprising a backbone network communication unit for transmitting and receiving data to and from the terminal and the backbone network (Back-Bone Network), And the second layer node communication unit transmits / receives data transmitted / received to / from the terminal with the second layer node when the call setup of the terminal is not performed. In a layer 2 node device in a broadband wireless access system, A user information manager for managing user information of the terminal; A grouping unit classifying the terminal with reference to the user information; And a call setup processing unit for determining a call setup subject of the terminal according to the classification result. 14. The method of claim 13, The grouping unit, And classifying a user group by referring to at least one of an access network type, an access location, a moving speed, and a service type of the terminal. 14. The method of claim 13, The call setting processing unit, When the terminal is classified into a first group, an IP (Internet Protocol) address is assigned to the terminal, And when the terminal is classified into a second group, transmitting an IP address allocation indication message of the terminal to a layer 1 node. 16. The method of claim 15, The first group is a group of terminals having mobility, And the second group is a group of terminals having fixed or nomadic characteristics. In a layer 1 node device in a broadband wireless access system, A wireless communication unit for communicating with a terminal, When the handover instruction message is received from the terminal, the device comprising a layer 2 node communication unit for transmitting the information of the terminal and target node information to the upper layer 2 node. 18. The method of claim 17, And a call setup processing unit for performing call setup of the terminal when an IP (Internet Protocol) assignment instruction message for a terminal entering from an adjacent cell is received from the layer 2 node. In a layer 2 node device in a broadband wireless access system, A first layer node communication unit for receiving information and target node information of a terminal performing handover from a lower layer 1 node; A handover processing unit configured to control user group reclassification of the terminal according to a user group to which the terminal belongs, when the terminal does not need a layer 2 node handover; And a grouping unit configured to classify the user group of the terminal under the control of the handover processor. The method of claim 19, The handover processing unit, If the terminal belongs to the first group, update the routing path with the terminal, And when the terminal belongs to the second group, controlling the grouping unit to perform reclassification of the terminal. 21. The method of claim 20, The first group is a group of terminals having mobility, And the second group is a group of terminals having fixed or nomadic characteristics. The method of claim 19, The grouping unit, And classifying a user group by referring to at least one of an access network type, an access location, a moving speed, and a service type of the terminal. The method of claim 19, The grouping unit, when the information of the terminal entering from the cell of the adjacent layer 2 node is provided, characterized in that for performing the user group classification of the incoming terminal. In the method of operating a layer 1 node in a broadband wireless access system, Checking, by the first layer node, generation of a call establishment request from a terminal; The first layer node notifying the second layer node of the call establishment request occurrence; If the Internet Protocol (IP) address assignment instruction message is received from the second layer node, the first layer node includes performing a call setup of the terminal. And the layer 2 node is an upper node of the layer 1 node, and controls call setup of the terminal connected to the layer 1 node. 25. The method of claim 24, Performing a call setup of the terminal, by the first layer node, processing the data transmitted and received by the terminal to a back-bone network; If the call setup of the terminal is not performed, the first layer node further comprises the step of relaying data transmitted and received between the terminal and the second layer node. In the method of operating a layer 2 node in a broadband wireless access system, Receiving, by the second layer node, a call establishment request occurrence of the terminal from the first layer node; Classifying, by the second layer node, a user group based on user information of the terminal; Determining, by the second layer node, a call setup execution subject for the terminal according to the classification result; And the layer 2 node is an upper node of the layer 1 node, and controls call setup of the terminal connected to the layer 1 node. 27. The method of claim 26, The user information, And at least one of an access network type, an access location, a moving speed, and a service type of the terminal. 27. The method of claim 26, When the terminal is classified into a first group, the second layer node assigning an IP (Internet Protocol) address to the terminal; And when the terminal is classified into a second group, transmitting the IP address allocation indication message of the terminal to the first layer node. The method of claim 28, The first group is a group of terminals having mobility, The second group is a group of terminals having fixed or nomadic characteristics. In the method of operating a layer 1 node in a broadband wireless access system, Checking, by the first layer node, whether a handover instruction message is received from a terminal; Transmitting, by the first layer node, information of the terminal and target node information to an upper second layer node; And the layer 2 node is an upper node of the layer 1 node, and controls call setup of the terminal connected to the layer 1 node. 31. The method of claim 30, When the IP (Internet Protocol) allocation instruction message for the terminal entering from the neighboring cell is received from the layer 2 node, the first layer node further comprises the step of performing call setup of the terminal. . In the method of operating a layer 2 node in a broadband wireless access system, Checking, by the layer 2 node, whether information of a terminal performing handover and target node information is received from a lower layer 1 node; Checking, by the second layer node, whether the second layer node handover of the terminal is necessary; If the second layer node handover is not necessary, the second layer node includes performing a user group reclassification for the terminal according to a user group to which the terminal belongs; And the layer 2 node is an upper node of the layer 1 node, and controls call setup of the terminal connected to the layer 1 node. 33. The method of claim 32, The process of reclassifying the user group for the terminal according to the user group to which the terminal belongs, When the terminal belongs to the first group, the second layer node updating a routing path with the first layer node; And when the terminal belongs to the second group, performing a group reclassification by the second layer node by referring to user information of the terminal. 34. The method of claim 33, The first group is a group of terminals having mobility, The second group is a group of terminals having fixed or nomadic characteristics. 34. The method of claim 33, The user information, And at least one of an access network type, an access location, a moving speed, and a service type of the terminal. 33. The method of claim 32, Checking, by the layer 2 node, whether information of a terminal entering from a cell of an adjacent layer 2 node is received; The second layer node, characterized in that further comprising the step of performing the user group classification of the incoming terminal.

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