KR20100006132A - Apparatus and method for allocating mobile identification in wireless communication system - Google Patents

Abstract

PURPOSE: A terminal ID apparatus and a method thereof using a terminal ID including the information of a neighboring base station are provided to configure the terminal ID including the neighboring base station information. CONSTITUTION: A terminal ID configuration unit(1223) configures a temporal terminal ID using a terminal ID index from the serving base station and base station ID index for handover from a target base station. In case it handovers to the target base station, a controller(1220) uses the provisional terminal ID and controls in order to perform network reentry procedure to the target base station. The controller controls in order to perform communications of the serving base station.

Description

Apparatus and method for allocating terminal identifier in wireless communication system {APPARATUS AND METHOD FOR ALLOCATING MOBILE IDENTIFICATION IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for allocating a terminal identifier in a wireless communication system, and more particularly, to an apparatus and method for configuring and assigning a terminal identifier including neighbor base station information in a wireless communication system.

In a wireless communication system, a base station and a terminal identify a service connection by using a connection identifier (CID). For example, in a communication system according to the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard, when the initial setting is completed, the base station and the terminal are configured with 16 bits such as a basic CID and a primary management CID. Create a CID. In addition, when providing a new service, the base station and the terminal generates a transmission CID for the new service connection. Thereafter, the base station configures a map to include the basic CID of the terminal in order to identify resource allocation information for the specific terminal. For example, the base station configures a downlink map (DL) to include the CID of the terminal as shown in FIG. 1.

1 illustrates a configuration of a map using a connection identifier in a wireless communication system according to the prior art.

As illustrated in FIG. 1, the downlink maps include a CID of a corresponding terminal to identify a terminal for resource allocation information included therein.

The terminal may check resource allocation information allocated by the base station through a map including its CID among the maps received from the base station.

The transmitting end transmits a CID indicating a service connection in a media access control (MAC) header of data. In this case, the receiving end may check whether the data is data for service connection allocated to it through the CID included in the MAC header of the received data.

As described above, the base station and the terminal identify the service connection by using the CID. Therefore, each CID should have a unique value without overlapping each other in a cell managed by the base station.

When the terminal is handed over, the terminal should update the CID used for communication with the serving base station to the CID to be used by the target base station in order to prevent the CID from overlapping. In this case, the terminal should update all CIDs even if the CIDs used in the serving base station overlap with some of the CIDs used by other terminals in the target base station. Here, the serving base station refers to a base station to which the terminal has accessed before performing the handover, and the target base station refers to a base station newly connected to the terminal through handover.

When the terminal hands over, the serving base station transmits CID information allocated to the terminal by candidate base stations that the terminal can hand over to update the CID of the terminal, a handover response message (HandOver) -RSP (RSPonse) Transmit to the terminal through. Accordingly, there is a problem that the size of the handover response message increases.

In addition, the transmitting end transmits the data by including the CID so that the receiving end can identify the service connection to the received data. Accordingly, a problem arises in that CIDs included in the data act as fixed overhead for transmission data.

Accordingly, an object of the present invention is to provide an apparatus and method for configuring and assigning a terminal identifier including neighbor base station information in a wireless communication system.

Another object of the present invention is to provide an apparatus and a method for a base station and a terminal of a wireless communication system to perform communication using a temporary terminal identifier configured by using a base station identifier index and a terminal identifier index.

Another object of the present invention is to provide an apparatus and method for sharing a base station identifier index allocated by a base station to an adjacent base station in a wireless communication system.

Still another object of the present invention is an apparatus and method for communicating with a terminal accessing through handover using a temporary terminal identifier configured using a base station identifier index assigned by the base station to an adjacent base station in a base station of a wireless communication system. In providing.

According to a first aspect of the present invention for achieving the objects of the present invention, a method for handover in a terminal of a wireless communication system, the serving base station to identify at least one base station identifier index assigned from at least one neighboring base station; And a process of identifying a target base station for handover, and configuring a temporary terminal identifier using a base station identifier index assigned by the serving base station from the target base station and a terminal identifier index assigned by the terminal to the serving base station. And performing a network reentry procedure with the target base station using the temporary terminal identifier, and performing a communication with the serving base station until the network reentry procedure with the target base station is completed. It is characterized by.

According to a second aspect of the present invention, a method for supporting handover of a terminal in a base station of a wireless communication system includes: assigning at least one base station identifier index to at least one neighboring base station; In case of an indication of over, a process of configuring a temporary terminal identifier for the terminal by using a terminal identifier index allocated to the neighboring base station and a terminal identifier index allocated from the neighboring base station; It characterized in that it comprises a process of performing a network re-entry procedure with the terminal using.

According to a third aspect of the present invention, a terminal apparatus for handover in a wireless communication system includes a transmitter for transmitting a signal, a receiver for receiving a signal, and a base station identifier index allocated from a target base station for handover by a serving base station. And a terminal identifier constructing unit configured to construct a temporary terminal identifier using a terminal identifier index allocated by the serving base station, and, when handing over to a target base station, using the temporary terminal identifier configured by the terminal identifier constructing unit. And a control unit configured to control to perform a network reentry procedure with the target base station and to perform communication with the serving base station until the network reentry procedure with the target base station is completed.

According to a fourth aspect of the present invention, a base station apparatus for supporting handover of a terminal in a wireless communication system includes a transmitter for transmitting a signal, a receiver for receiving a signal, and at least one base station identifier for at least one neighboring base station. A base station identifier index setting unit for allocating an index, a wired interface for transmitting the base station identifier index allocated to a neighbor base station to at least one neighbor base station, and a handover of a terminal from a neighbor base station through the wired interface; A terminal identifier constructing unit configured to construct a temporary terminal identifier for the terminal using a terminal identifier index allocated to the neighboring base station and a terminal handing over from the neighboring base station; Network with the terminal It characterized in that it comprises a control unit for controlling to perform the re-entry procedure.

As described above, by communicating with a target base station newly connected through handover using a terminal identifier configured to represent an adjacent base station in a wireless communication system, the terminal performing the handover is connected to a target identifier (CID: Connection) from the target base station. It is possible to reduce the overhead incurred to receive the ID), and to communicate with the newly connected target base station through the handover without assigning the connection identifier.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, a description will be given of a technique for improving handover performance using a terminal identifier configured to indicate an adjacent base station in a wireless communication system.

In the following description, a base station that has been provided with a service before the terminal handovers among the base stations constituting the wireless communication system is called a serving base station, and a base station newly connected through the handover is called a target base station.

In a wireless communication system, a base station and a terminal identify a service connection established between the base station and the terminal using a terminal identifier (hereinafter referred to as MS ID) and a flow identifier (hereinafter referred to as Flow ID). Accordingly, the base station allocates the MS ID to the terminal through an initial setting operation with the terminal. For example, the base station allocates an MS ID to the terminal when the terminal requests network entry.

In addition, after the base station allocates the MS ID to the terminal, the base station generates a flow ID to indicate a service creation and a connection supporting the terminal having assigned the MS ID. Accordingly, the transmitting end includes the flow ID of the service connection corresponding to the data in the MAC (Media Access Control) header of the data, and the receiving end transmits the Flow ID included in the MAC header of the data received from the transmitting end. Through the check whether the data is the data for the service connection assigned to them.

As shown in FIG. 2, the base station and the terminal may perform communication using an MS ID configured to indicate neighboring base station information.

2 illustrates a configuration of a terminal identifier in a wireless communication system according to an embodiment of the present invention.

As shown in FIG. 2, the MS ID includes a BS ID index 200 and an MS ID index 210.

The BS ID index 200 indicates identification information of the base station to which the MS ID index 210 is allocated. For example, when the MS ID index 210 constituting the MS ID is allocated from a base station in communication, the BS ID index 200 of the MS ID is set to '0'. That is, if it is assumed that the MS ID is composed of an 11-bit MS ID index 210 and a 5-bit BS ID index 200, the BS ID index 200 is set to '00000'. Here, the lengths of the BS ID index 200 and the MS ID index 210 may be changed as necessary.

Meanwhile, when the neighbor base station allocates the MS ID index 210 constituting the MS ID, the BS ID index 200 of the MS ID is set to the BS ID index 210 assigned by the base station in communication to the neighbor base station. do. That is, the base station may set the BS ID index 200 of the MS ID by using the BS ID index assigned to neighboring base stations as shown in FIG. 3.

3 illustrates a configuration of a wireless communication system for allocating base station identifier indexes of neighboring base stations according to an embodiment of the present invention.

As shown in FIG. 3, base station 1 310 allocates a BS ID index as shown in Table 1 to adjacent base stations.

Base station BS ID index Base station 8 One Base station 4 2 Base station 5 3 Base station 6 4 Base station 2 5 Base station 7 6

In addition, the base station 2 320 allocates the BS ID index as shown in Table 2 to neighboring base stations.

Base station BS ID index Base station 1 One Base station 6 2 Base station 9 3 Base station 10 4 Base station 3 5 Base station 7 6

In addition, base station 3 330 allocates a BS ID index as shown in Table 3 below to neighboring base stations.

Base station BS ID index Base station 7 One Base station 2 2 Base station 10 3 Base station 11 4 Base station 12 5 Base station 13 6

The base stations allocate BS ID indexes to neighbor base stations as shown in Tables 1, 2, and 3 above. Accordingly, when the MS ID of the terminal is configured using the MS ID index assigned by the neighboring base station, the base station uses the BS ID index assigned to the neighboring base station and the MD ID index assigned to the terminal by the neighboring base station. Configure the MS ID.

The base station configures the resource allocation message to include the MS ID of the terminal so that the terminals can identify their resource allocation information in the resource allocation message. For example, the base station configures a downlink map (DL) -MAP (DL) as shown in FIG. 4.

4 illustrates a configuration of a map using a terminal identifier in a wireless communication system according to an embodiment of the present invention.

As shown in FIG. 4, the downlink maps include the MS ID of the corresponding terminal in order to identify the terminal for the resource allocation information included therein. In this case, the MS ID of the terminal includes a BS ID index indicating the base station information to which the MS ID index is allocated as shown in FIG. Therefore, when MS ID 3 401 is configured using the MS ID index allocated by the base station constituting the downlink map, the downlink map has the MS ID 3 401 in which the BS ID index is set to '00000'. It includes. On the other hand, when the MS constituting the MS ID 5 (403) using the MS ID index assigned by the neighboring base station in the base station constituting the downlink map, the BS assigned the BS ID index from the base station to the neighboring base station BS MS ID 5 403 set to the ID index. In the following description, an MS ID configured by using an MS ID index allocated by a neighboring base station such as MS ID 5 (403) is called a temporary MS ID.

As described above, the base station transmits the MS ID included in each downlink map so that the terminal can identify the downlink map. That is, the base station may allocate resources or communicate with the terminal using the temporary MS ID of the terminal before allocating the MS ID from the neighboring base station to the handover terminal.

The terminal may check the downlink map including its resource allocation information through the MS ID included in the downlink map. As illustrated in FIG. 4, when the base station configures and transmits a downlink map including a temporary MS ID, the terminal should be able to configure a temporary MS ID included in the downlink map in advance. The terminal needs to know the BS ID index allocated by the base station to the neighboring base station in order to configure a temporary MS ID identical to the temporary MS ID configured by the base station. Accordingly, the base station transmits BS ID index information allocated from the neighboring base station to the terminal. For example, the base station includes a BS ID index information allocated from neighbor base stations in a neighbor base station information message (NBR (NeighBoR) -ADV (ADVertisement)) as shown in FIG. Send them to.

5 illustrates a procedure for transmitting a base station identifier index from a base station to a terminal in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 5, the base station checks BS ID indices allocated from neighboring base stations in step 501. For example, in FIG. 3, the base station 2 320 identifies the BS ID index 5 allocated from the base station 1 310 and the BS ID index 2 allocated from the base station 3 330 through the backbone.

After checking the BS ID indexes allocated by the neighbor base stations, the base station proceeds to step 503 and generates a neighbor base station information message (NBR-ADV) including the checked BS ID indexes.

After generating the neighbor base station information message, the base station proceeds to step 505 and broadcasts the neighbor base station information message to the terminals located in the service area.

The base station then terminates this algorithm.

As described above, the terminal that has obtained the BS ID index information allocated by neighboring base stations from the serving base station performs a handover as shown in FIG. 6.

6 illustrates a procedure for performing handover in a terminal of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 6, the terminal determines whether a neighbor base station information message (NBR-ADV) is received in step 601.

If the neighbor base station information message is received from the serving base station, the terminal proceeds to step 603 and checks the BS ID index information allocated by the serving base station from the neighbor base stations in the neighbor base station information message. Thereafter, the terminal stores BS ID index information allocated by neighboring base stations to the serving base station.

After the serving base station checks and stores BS ID index information allocated from neighboring base stations, the terminal proceeds to step 605 to determine a target base station for handover through handover negotiation with the serving base station. For example, the terminal requests handover from the serving base station to obtain information of candidate base stations capable of supporting its own handover. Thereafter, the terminal determines a target base station for handover among the candidate base stations.

After determining the target base station, the terminal proceeds to step 607 and transmits a handover indication message (HO-IND (Indication)) indicating a handover to the target base station to the serving base station. In this case, the handover indication message includes identifier (ID) information of the target base station.

After transmitting the handover indication message, the terminal proceeds to step 609 to configure a temporary MS ID using the BS ID index assigned by the target base station to the serving base station. For example, the terminal configures the temporary MS ID by using the BS ID index assigned by the serving base station from the target base station and the MS ID index assigned by the serving base station.

After configuring the temporary MS ID, the terminal proceeds to step 611 to communicate with the target base station using the temporary MS ID. For example, the terminal checks the resource allocation message transmitted by the target base station using the temporary MS ID. In addition, the terminal transmits a band request message (BW (BandWidth) -Req (Request)) to the target base station using the temporary MS ID.

In step 613, the terminal is assigned an MS ID through a ranging procedure with the target base station. For example, the terminal checks the MS ID assigned by the target base station in a ranging response message (RNG (Ranging) -RSP (Response)).

When the MS ID is allocated from the target base station, the terminal communicates with the target base station using the assigned MS ID in step 615.

Thereafter, the terminal terminates the present algorithm.

In the above-described embodiment, the communication between the terminal and the target base station (step 611) and the ranging procedure (step 613) between the terminal and the target base station may be performed sequentially or in parallel. In addition, the ranging procedure (step 613) may be performed before the communication procedure (step 611).

6 will be described on the assumption that the terminal requests a handover to the serving base station and determines the target base station. However, the same applies to a case where a handover request is requested from a serving base station or a target base station is determined by the serving base station. In this case, the terminal selectively transmits a handover indication message to the serving base station. That is, the terminal may or may not transmit a handover indication message to the serving base station.

As described above, the terminal and the target base station can communicate using the temporary MS ID. In this case, the terminal and the target base station may use the same Flow ID generated for the service connection between the terminal and the serving base station. That is, when the target base station does not instruct the change of the flow IDs used by the terminal for service connection with the serving base station, the terminal and the target base station may use the same without changing the flow ID.

Hereinafter, a method for supporting handover of a terminal in a target base station will be described.

7 illustrates a procedure for supporting handover of a terminal in a base station of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 7, the target base station proceeds to step 701 and allocates a BS ID index to neighboring base stations. That is, the target base station transmits the BS ID index allocated to the neighbor base stations to the neighbor base stations through the backbone.

After allocating BS ID indexes to the neighbor base stations, the target base station checks whether a handover of the terminal is notified from the neighbor base station in step 703. For example, the target base station determines whether a handover indication message of the terminal is received from a serving base station of the terminal through a backbone.

If the terminal is notified of the handover, the target base station proceeds to step 705 and configures the temporary MS ID for the terminal using the BS ID index allocated to the neighboring base station notifying the handover of the terminal. For example, the target base station checks the MS ID index allocated by the neighboring base station to the terminal through the handover indication message. Thereafter, the target base station configures a temporary MS ID by combining the BS ID index allocated to the neighbor base station that has transmitted the handover indication message and the MS ID index allocated to the terminal to which the neighbor base station is handed over.

After configuring the temporary MS ID of the terminal, the target base station proceeds to step 707 to communicate with the terminal using the temporary MS ID. For example, the target base station configures and transmits a resource allocation message to be transmitted to the terminal using the temporary MS ID. In addition, the target base station confirms a bandwidth request message (BW-Req) transmitted by the terminal through the temporary MS ID.

In addition, the target base station proceeds to step 709 to configure the MS ID to be assigned to the terminal.

After configuring the MS ID to be allocated to the terminal, the target base station proceeds to step 711 and transmits the configured MS ID to the terminal through a ranging procedure with the terminal. For example, the target base station transmits the MS ID to the terminal using a ranging response message (RNG (Ranging) -RSP (Response)).

After transmitting the MS ID, the target base station proceeds to step 713 to communicate with the MS using the MS ID.

Thereafter, the target base station terminates the present algorithm.

In the above-described embodiment, the communication between the terminal and the target base station (step 707) and the ranging procedure between the terminal and the target base station (steps 709 to 711) may be performed sequentially or in parallel. In addition, the ranging procedure (steps 709 to 711) may be performed before the communication procedure (step 707).

Hereinafter, a handover method of a terminal using a temporary MS ID in a wireless communication system will be described.

8 illustrates a handover procedure of a terminal in a wireless communication system according to an embodiment of the present invention. The following description shows only signals transmitted and received by the terminal 801, the serving base station 803, and the terminal 801 and the target base station 805 using radio resources.

Referring to FIG. 8, when a terminal 801 that has received a service from a serving base station 803 wants a handover, the terminal 801 sends a handover request message to the serving base station 803 (HO). REQ (Request)) is transmitted (step 811).

When the handover request message is received, the serving base station 803 identifies a candidate base station capable of supporting handover of the terminal 801 among neighboring base stations to which the terminal 801 can handover. In this case, the serving base station 803 identifies a candidate base station capable of supporting handover of the terminal 801 through a backbone.

Thereafter, the serving base station 803 transmits a handover response message (HO-RSP (Response)) including candidate base station information supporting handover of the terminal 801 to the terminal 801 (step 813). ).

When the handover response message is received, the terminal 801 selects a target base station 805 for handover among candidate base stations identified through the handover response message. Thereafter, the terminal 801 transmits a handover indication message (HO IND (Indication)) to the serving base station 803 to notify the handover to the target base station 805 (step 815). Here, the handover indication message includes the target base station 805 information.

After the terminal 801 transmits a handover indication message, the serving base station 803 configures a temporary MS ID by using the BS ID index allocated from the target base station 805. For example, the terminal 801 checks the BS ID index allocated by the serving base station 803 from the neighbor base stations through the neighbor base station information message provided from the serving base station 803.

The serving base station 803 identifies the target base station 805 selected by the terminal 801 for handover through the handover indication message. In this case, the serving base station 803 instructs the target base station 805 to handover the terminal 801 through a backbone.

When the target base station 805 receives a handover of the terminal 801 from the serving base station 803 through a backbone, the target base station 805 allocates resources to the terminal 801 (step 817). For example, the target base station 805 uses the BS ID index allocated to the serving base station 803 and the terminal 801 using the MD ID index assigned by the terminal 801 from the serving base station 803. Configure a temporary MS ID for. Thereafter, the target base station 805 includes the temporary MS ID in the resource allocation message for the terminal 801 and transmits it to the terminal 801. In this case, the terminals located in the service area of the target base station 805 do not use the area corresponding to the resource allocation message including the temporary MS ID by recognizing the temporary MS ID as a different MS ID. . Meanwhile, the terminal 801 may check the resource allocation message transmitted by the target base station 805 using the configured temporary MS ID.

The target base station 805 transmits downlink data to the terminal 801 by using the downlink resources allocated to the terminal 801 (step 819). In this case, when the target base station 805 does not instruct to change the flow ID used for the service connection between the terminal 801 and the serving base station 803, the target base station 805 is the terminal 801 ) And the downlink data using the Flow ID used for service connection between the serving base station 803.

The terminal 801 transmits a band request message (BW (BandWidth) -Req) and uplink data using the resources allocated from the target base station 805 (step 821). In this case, the terminal 801 includes the temporary MS ID in the band request message and transmits it to the target base station 805. In addition, when the target base station 805 does not instruct to change the flow ID used for service connection between the terminal 801 and the serving base station 803, the terminal 801 is the serving base station 803 ) Transmits uplink data using the Flow ID used for service connection.

In addition, the terminal 801 performs a ranging procedure with the target base station 805 (steps 823 and 825). For example, the terminal 801 transmits a ranging request message (RNG (Ranging) REQ (Request)) to the target base station 805 using a resource obtained by transmitting a ranging code to the target base station 805. (Step 823). The target base station 805 transmits a response message (RNG RSP (Response)) for the ranging request message provided from the terminal 801 to the terminal 801 (step 825). In this case, the target base station 805 transmits the newly allocated MS ID information to the terminal 801 to the terminal 801 by including it in the response message.

In this case, the terminal 801 and the target base station 805 may sequentially perform a resource allocation procedure, a data transmission and reception procedure (steps 817 to 821) and a ranging procedure (steps 823 to 825), or in parallel It may also be performed. In addition, the ranging procedure (steps 823 to 825) may be performed before the resource allocation procedure and data transmission / reception procedure (steps 817 to 821).

8 is assuming that the terminal 801 requests a handover to the serving base station 803 and determines the target base station 805. However, the same applies to the case where the serving base station 803 requests a handover or when the serving base station 803 determines the target base station 805. In this case, the terminal 801 selectively transmits a handover indication message to the serving base station 803. That is, the terminal 802 may or may not transmit a handover indication message to the serving base station 803.

In the above-described embodiment, the serving base station includes BS ID index information allocated from neighboring base stations in the neighbor base station information message and transmits it to the terminal. Accordingly, the terminal checks the BS ID index information allocated by the serving base station from the neighbor base stations through the neighbor base station information message provided from the serving base station.

In another embodiment, the base station may transmit a handover message including BS ID index information allocated from neighboring base stations in the handover process of the terminal to the terminal. In this case, the base station transmits all BS ID index information or partial BS ID index information allocated from neighboring base stations to the terminal.

Accordingly, the terminal can check the BS ID index information allocated by the serving base station from neighbor base stations in the handover message provided from the serving base station in the handover process as shown in FIG. 9.

9 illustrates a procedure for performing handover in a terminal of a wireless communication system according to another embodiment of the present invention.

Referring to FIG. 9, the terminal determines whether to perform handover to an adjacent base station in step 901. For example, the terminal determines whether to perform a handover in consideration of the signal strength of the serving base station.

If it is determined that the handover is to be performed, the terminal proceeds to step 903 and requests a handover to the serving base station.

In step 905, the terminal determines whether a handover response message is received from the serving base station.

If the handover response message is received from the serving base station, the terminal proceeds to step 907 to obtain information of candidate base stations capable of supporting its own handover in the handover response message. In this case, the terminal checks the BS ID index allocated by the serving base station from the candidate base stations in the handover response message.

After identifying the candidate base station, the terminal proceeds to step 909 to determine a target base station for handover of the candidate base stations.

Thereafter, the terminal proceeds to step 911 to configure a temporary MS ID for communicating with the target base station. For example, the terminal configures the temporary MS ID using the BS ID index assigned by the serving base station from the target base station and the MS ID index assigned from the serving base station.

After configuring the temporary MS ID, the terminal proceeds to step 913 to perform a network reentry procedure with the target base station using the temporary MS ID.

In step 917, the terminal determines whether the network re-entry procedure with the target base station is completed successfully.

If the network reentry procedure with the target base station is not completed, the terminal proceeds to step 913 to continuously perform the network reentry procedure with the target base station.

If the network re-entry procedure with the target base station is completed, the terminal proceeds to step 919 to release the connection with the serving base station and performs communication with the target base station. In this case, the terminal communicates with the target base station using the MS ID allocated from the target base station through network re-entry.

In addition, the terminal selects the target base station in step 909 and proceeds to step 915 to perform communication with the serving base station. In this case, the terminal communicates with the serving base station using the MS ID assigned from the serving base station.

In step 917, the terminal determines whether the network re-entry procedure with the target base station is completed successfully.

If the network re-entry procedure with the target base station is not completed, the terminal proceeds to step 915 to continuously communicate with the serving base station.

On the other hand, when the network re-entry procedure with the target base station is completed, the terminal proceeds to step 919 to release the connection with the serving base station, and performs communication with the target base station. In this case, the terminal communicates with the target base station using the MS ID allocated from the target base station through network re-entry.

Thereafter, the terminal terminates the present algorithm.

As described above, the terminal confirms BS ID index information allocated by neighboring base stations to the serving base station through a handover response message. In this case, when the serving base station determines whether the terminal supports handover, the neighboring base station may transmit BS ID index information allocated to the serving base station to the serving base station together with whether the terminal supports handover.

9 is assuming that the terminal requests a handover to the serving base station and determines the target base station. However, the same applies to a case where a handover request is requested from a serving base station or a target base station is determined by the serving base station. In this case, the terminal selectively transmits a handover indication message to the serving base station. That is, the terminal may or may not transmit a handover indication message to the serving base station.

Hereinafter, a handover method of a terminal using a temporary MS ID in a wireless communication system will be described.

10 illustrates a handover procedure of a terminal in a wireless communication system according to another embodiment of the present invention. The following description shows only signals transmitted and received using radio resources between the terminal 1001, the serving base station 1003, and the target base station 1005.

Referring to FIG. 10, when a terminal 1001 that has received a service from a serving base station 1003 desires handover, the terminal 1001 sends a handover request message (HO-REQ) to the serving base station 1003. Transmit (step 1011).

When the handover request message is received, the serving base station 1003 identifies candidate base stations capable of supporting handover of the terminal 1001 among neighboring base stations to which the terminal 1001 can handover. For example, the serving base station 1003 identifies candidate base stations that can support handover of the terminal 1001 through the backbone.

Thereafter, the serving base station 1003 constructs a handover response message (HO-RSP) including information of candidate base stations supporting the handover of the terminal 1001 and transmits it to the terminal 1001 (step 1013). ). At this time, the serving base station 1003 transmits BS ID index information allocated from the candidate base stations together with the handover response message.

The terminal 1001 identifies candidate base stations capable of handover through the handover response message and a BS ID index assigned by the serving base station 1003 from respective candidate base stations.

In addition, the terminal 1001 selects a target base station 1005 for handover among the candidate base stations.

Thereafter, the terminal 1001 may continue communication with the serving base station until the network reentry procedure with the target base station 1005 is completed (step 1015). In this case, the terminal 1001 communicates with the serving base station 1003 using the MS ID allocated from the serving base station 1003.

In addition, the terminal 1001 selects the target base station 1005 and configures a temporary MS ID by using the BS ID index allocated by the target base station 1005 to the serving base station 1003. For example, the terminal 1001 configures a temporary MS ID by using the BS ID index allocated by the serving base station 1003 from the target base station 1005 and the MS ID index allocated from the serving base station 1003.

Thereafter, the terminal 1001 performs a network reentry procedure with the target base station 1005 using the temporary MS ID (steps 1017 and 1019). For example, the terminal 1001 transmits a ranging request message (RNG REQ) to the target base station 1005 using a resource obtained by transmitting a ranging code to the target base station 1005 (step 1017). ). The target base station 1005 transmits a response message (RNG RSP) for the ranging request message provided from the terminal 1001 to the terminal 1001 (step 1019). In this case, the target base station 1005 transmits the newly assigned MS ID information to the terminal 1001 to the terminal 1001 by including it in the response message.

In this case, the terminal 1001 may sequentially perform communication with the serving base station 1003 (step 1015) and a network reentry procedure (step 1017, step 1019) with the target base station 1005, or may be performed in parallel. May be

In the above-described embodiment, the base station may transmit a handover message including BS ID index information allocated from neighboring base stations in the handover process of the terminal to the terminal. Accordingly, the terminal may check the BS ID index information allocated by the serving base station from neighboring base stations in the handover message provided by the serving base station in the handover process.

In another embodiment, the base station may transmit a separate message including BS ID index information allocated from neighboring base stations to the terminal. In this case, the base station transmits all BS ID index information or partial BS ID index information allocated from neighboring base stations to the terminal.

Accordingly, the terminal may check the BS ID index information allocated by the serving base station from neighboring base stations in a separate message including the BS ID index information.

Hereinafter, the configuration of a terminal for handover to a target base station will be described.

11 is a block diagram of a terminal for handover in a wireless communication system according to an embodiment of the present invention.

As illustrated in FIG. 11, the terminal includes a duplexer 1100, a receiver 1110, a controller 1120, and a transmitter 1130.

The duplexer 1100 transmits a transmission signal provided from the transmitter 1130 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the receiver 1110.

The receiver 1110 includes an RF processor 1111, an analog / digital convertor 1113, an orthogonal frequency division multiplexing (OFDM) demodulator 1115, a decoder 1117, and a message processor 1119. It is configured to include.

The RF processor 1111 converts a high frequency signal provided from the duplexer 1100 into a baseband analog signal. The analog / digital converter 1113 converts an analog signal provided from the RF processor 1111 into digital sample data and outputs the digital sample data. The OFDM demodulator 1115 converts sample data in the time domain provided from the analog-to-digital converter 1113 through Fourier transform into data in the frequency domain. For example, the OFDM demodulator 1115 converts sample data in the time domain into data in the frequency domain through fast Fourier transform.

The decoder 1117 demodulates and decodes the signal provided from the OFDM demodulator 1115 according to a predetermined modulation level (MCS level).

The message processor 1119 detects a control message from the signal provided from the decoder 1117 and provides it to the controller 1120. For example, the message processor 1119 detects a neighbor base station information message, a handover response message, a resource allocation message, and a resource allocation message provided from a target base station and provides the same to the controller 1120.

The controller 1120 controls the overall operation and handover of the terminal. For example, the controller 1120 checks BS ID index information allocated by the serving base station from neighbor base stations through the neighbor base station information message provided from the message processor 1119. For another example, the controller 1120 may check the BS ID index information allocated by the serving base station from neighbor base stations through the handover message provided from the message processor 1119. For another example, the controller 1120 may check the BS ID index information allocated by the serving base station from neighbor base stations through a separate message including the BS ID index information provided from the message processor 1119. .

In addition, the controller 1120 determines whether to handover in consideration of signal strength. When determining to perform handover, the controller 1120 selects a target base station for handover from among candidate base stations obtained by requesting handover to a serving base station. In this case, the controller 1120 obtains the candidate base station information from the handover response message provided from the message processor 1119.

After selecting the target base station, the controller 1120 controls to perform a network reentry procedure with the target base station by using the temporary MS ID provided from the MS ID configuration unit 1123. In this case, the controller 1120 controls to continue communication with the serving base station until the network re-entry procedure with the target base station is completed. Here, the controller 1120 controls to perform communication with the serving base station using the MS ID assigned from the serving base station.

The storage unit 1121 stores BS ID index information allocated by neighboring base stations to the serving base station identified by the control unit 1120.

When the control unit 1120 determines the target base station, the MS ID configuration unit 1123 checks the BS ID index allocated by the serving base station from the target base station in the storage unit 1121. Thereafter, the MS ID constructing unit 1123 combines the checked BS ID index and the MS ID index allocated from the serving base station to form a temporary MS ID for communicating with a target base station.

The transmitter 1130 includes a message generator 1131, an encoder 1133, an OFDM modulator 1135, a digital / analog converter 1137, and an RF processor 1139.

The message generator 1131 generates a control message for handover under the control of the controller 1120. For example, when the controller 1120 determines the handover, the message generator 1131 generates a handover request message for requesting handover to the serving base station. In addition, when the control unit 1120 determines a target base station for handover, the message generator 1131 generates a handover instruction message instructing handover to the target base station. In addition, when communicating with a target base station using a temporary MS ID under the control of the controller 1120, the message generator 1131 configures a band request message including the temporary MS ID. In addition, when the target base station does not instruct to change the flow ID, the message generator 1131 configures uplink data using the flow ID used for service connection with the serving base station.

The encoder 1133 codes and modulates a transmission signal or a message provided from the message generator 1131 according to a modulation level (MCS level) and outputs the same.

The OFDM modulator 1135 converts the frequency domain data provided from the encoder 1133 into inverse time sample data (OFDM symbols) through an inverse Fourier transform. For example, the OFDM modulator 1135 converts frequency domain data into time domain sample data (OFDM symbol) through an inverse fast Fourier transform.

The digital-analog converter 1137 converts the sample data provided from the OFDM modulator 1135 into an analog signal and outputs the analog signal. The RF processor 1139 converts a baseband analog signal provided from the digital / analog converter 1137 into a high frequency signal and outputs the converted high frequency signal.

In the above-described embodiment, the control unit 1120 controls to maintain communication with the serving base station when performing a network re-entry procedure with the target base station.

In another embodiment, the controller 1120 selects the target base station and instructs the serving base station to handover. Thereafter, the controller 1120 controls the target base station to perform communication using the temporary MS ID provided from the MS ID configuration unit 1123. In this case, the controller 1120 controls to perform a network re-entry procedure with the target base station while communicating with the target base station. For example, the controller 1120 may control to sequentially perform communication with the target base station and network re-entry procedure, or may be controlled to perform in parallel. In addition, the controller 1120 may control the network reentry procedure with the target base station to be performed before the communication procedure with the target base station.

Hereinafter, the configuration of a base station for controlling handover of a terminal will be described.

12 is a block diagram of a base station for controlling handover of a terminal in a wireless communication system according to an embodiment of the present invention.

As illustrated in FIG. 12, the base station includes a duplexer 1200, a receiver 1210, a controller 1220, and a transmitter 1230.

The duplexer 1200 transmits a transmission signal provided from the transmitter 1230 through an antenna according to a duplexing scheme, and provides a reception signal from the antenna to the receiver 1210.

The receiver 1210 includes an RF processor 1211, an analog / digital convertor 1213, an OFDM demodulator 1215, a decoder 1217, and a message processor 1219.

The RF processor 1211 converts a high frequency signal provided from the duplexer 1200 into a baseband analog signal. The analog-to-digital converter 1213 converts an analog signal provided from the RF processor 1211 into digital sample data and outputs the digital sample data. The OFDM demodulator 1215 converts sample data in the time domain provided from the analog-to-digital converter 1213 through Fourier transform into data in the frequency domain. For example, the OFDM demodulator 1215 converts sample data in the time domain into data in the frequency domain through fast Fourier transform.

The decoder 1217 demodulates and decodes the signal provided from the OFDM demodulator 1215 according to a predetermined modulation level (MCS level).

The message processor 1219 detects a control message from the signal provided from the decoder 1217 and provides the control message to the controller 1220. For example, the message processor 1219 detects the handover request message and the handover indication message provided from the terminal providing the service, and provides the message to the controller 1220.

The controller 1220 controls the overall operation of the base station and handover of a terminal located in a service area. For example, the controller 1220 controls to transmit BS ID index information allocated from neighbor base stations through a backbone to terminals located in a service area. In addition, the controller 1220 controls the BS ID index setting unit 1221 to transmit the BS ID index allocated to the neighbor base stations to the neighbor base stations via the backbone.

In addition, the controller 1220 identifies neighboring base stations to which a handover requesting terminal can handover through a handover request message provided from the message processor 1219. Thereafter, the controller 1220 determines whether the neighbor base stations can support handover of the terminal through a backbone.

In addition, when receiving the handover instruction message from the message processor 1219, the controller 1220 identifies the target base station for the handover. Thereafter, the controller 1220 instructs a handover of the terminal to the target base station through a backbone.

In addition, when receiving a handover of the terminal from the neighboring base station through the backbone, the controller 1220 allocates resources to the terminal included in the handover instruction message. In this case, the controller 1220 controls to configure a resource allocation message using the temporary MS ID of the terminal configured by the MS ID configuration unit 1223. If the MS ID is assigned to the terminal, the controller 1220 controls to configure a resource allocation message using the MS ID assigned to the terminal.

The BS ID index setting unit 1221 determines a BS ID index to be allocated to neighboring base stations.

The MS ID configuration unit 1223 configures a temporary MS ID for communicating with a terminal that has not assigned an MS ID and an MS ID to be allocated to the terminal. In this case, when the temporary MS ID is configured, the MS ID configuration unit 1223 assigns the BS ID index allocated to the neighbor base station instructing handover of the terminal and the MS ID assigned by the terminal requesting the handover from the neighbor base station. Combine indexes to form a temporary MS ID.

The transmitter 1230 includes a message generator 1231, an encoder 1233, an OFDM modulator 1235, a digital-to-analog converter 1237, and an RF processor 12311.

The message generator 1231 generates a control message for handover under the control of the controller 1220. For example, the message generator 1231 configures a neighbor base station information message to include BS ID index information allocated from neighbor base stations. In addition, when the controller 1220 determines whether the neighbor base stations support handover through the backbone, the message generator 1231 receives a handover response message including information of neighbor base stations capable of supporting handover of the terminal. Create In addition, when the controller 1220 is instructed to handover the terminal through the backbone to allocate resources to the terminal, the message generator 1231 generates a resource allocation message including the resource allocation information. In this case, the message generator 1231 configures a resource allocation message including a temporary MS ID of the terminal. Subsequently, when the MS ID is allocated to the terminal under the control of the controller 1220, the message generator 1231 composes a resource allocation message including the MS ID allocated to the terminal. In addition, when not instructing the UE to change the Flow ID, the message generator 1231 configures downlink data using the Flow ID used by the UE for service connection with the serving BS.

The encoder 1233 signs and modulates a transmission signal or a message provided from the message generator 1231 according to a modulation level (MCS level) and outputs the same.

The OFDM modulator 1235 converts the frequency domain data provided from the encoder 1233 into sample data (OFDM symbols) in the time domain through inverse Fourier transform. For example, the OFDM modulator 1235 converts frequency domain data into sample data (OFDM symbols) in time domain through an inverse fast Fourier transform.

The digital-to-analog converter 1237 converts the sample data provided from the OFDM modulator 1235 into an analog signal and outputs the analog signal. The RF processor 12311 converts a baseband analog signal provided from the digital / analog converter 1237 into a high frequency signal and outputs the converted high frequency signal.

Although not shown, the base station further includes a wired interface for communicating with a neighbor base station. That is, the base station transmits the BS ID index allocated to the neighbor base stations through the wired interface to the neighbor base stations, and receives the BS ID index allocated from the neighbor base stations through the wired interface.

In the above-described embodiment, the base station transmits BS ID index information allocated from neighboring base stations to neighboring base stations using the neighbor base station information message. In another embodiment, the base station may transmit BS ID index information allocated from neighboring base stations to the terminal using a handover message. In this case, the message generator 1231 generates a handover message to include BS ID index information allocated from neighboring base stations. In another embodiment, the base station may transmit a separate message including BS ID index information allocated from neighboring base stations to the terminal. In this case, the message generator 1231 generates a separate message including BS ID index information allocated from neighboring base stations.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present 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.

1 is a diagram showing the configuration of a map using a connection identifier in a wireless communication system according to the prior art;

2 is a diagram illustrating a configuration of a terminal identifier in a wireless communication system according to an embodiment of the present invention;

3 is a diagram illustrating a configuration of a wireless communication system for allocating base station identifier indexes of neighboring base stations according to an embodiment of the present invention;

4 is a diagram illustrating a configuration of a map using a terminal identifier in a wireless communication system according to an embodiment of the present invention;

5 is a diagram illustrating a procedure for transmitting a base station identifier index from a base station to a terminal of a wireless communication system according to an embodiment of the present invention;

6 is a diagram illustrating a procedure for performing handover in a terminal of a wireless communication system according to an embodiment of the present invention;

7 is a diagram illustrating a procedure for supporting handover of a terminal in a base station of a wireless communication system according to an embodiment of the present invention;

8 is a diagram illustrating a handover procedure of a terminal in a wireless communication system according to an embodiment of the present invention;

9 is a diagram illustrating a procedure for performing handover in a terminal of a wireless communication system according to another embodiment of the present invention;

10 is a diagram illustrating a handover procedure of a terminal in a wireless communication system according to another embodiment of the present invention;

11 is a block diagram of a terminal for handover in a wireless communication system according to an embodiment of the present invention; and

12 is a block diagram of a base station for controlling handover of a terminal in a wireless communication system according to an embodiment of the present invention.

Claims (24)

A method for handover in a terminal of a wireless communication system, Identifying, by the serving base station, at least one base station identifier index allocated from at least one neighboring base station; Identifying a target base station for handover; Configuring, by the serving base station, a temporary terminal identifier using a base station identifier index allocated from the target base station and a terminal identifier index assigned by the serving base station; Performing a network reentry procedure with the target base station using the temporary terminal identifier; And performing communication with the serving base station until the network reentry procedure with the target base station is completed. The method of claim 1, Checking the base station identifier index, And determining, by the serving base station, at least one base station identifier index allocated from at least one neighboring base station through a neighbor base station information message (NBR (NeighBoR) -ADVertisement) received from the serving base station. How to feature. The method of claim 1, Checking the base station identifier index, Identifying at least one base station identifier index assigned by the serving base station from at least one neighboring base station through a handover message of at least one handover message provided by the serving base station for handover; Characterized in that the method. The method of claim 1, The temporary terminal identifier may change the size of the base station identifier index and the size of the terminal identifier index constituting the temporary terminal identifier. The method of claim 1, The process of performing communication with the serving base station, And performing communication with the serving base station by using a terminal identifier assigned by the serving base station. The method of claim 1, Terminating the communication with the serving base station when the network re-entry procedure with the target base station is completed; And communicating with the target base station by using the terminal identifier assigned by the target base station through the network re-entry procedure. A method for supporting handover of a terminal in a base station of a wireless communication system, Allocating at least one base station identifier index to at least one neighboring base station; When the handover of the terminal is instructed by the neighboring base station, a process of configuring a temporary terminal identifier for the terminal by using the base station identifier index assigned to the neighboring base station and the terminal identifier index allocated from the neighboring base station and, And performing a network re-entry procedure with the terminal by using the temporary terminal identifier. The method of claim 7, wherein Allocating the base station identifier index, Allocating at least one base station identifier index to at least one neighboring base station; When receiving a handover request of the terminal from at least one neighboring base station, comprising the step of transmitting to the neighboring base station by including the base station identifier index assigned to the neighboring base station in the response signal for the handover request Way. The method of claim 7, wherein The temporary terminal identifier may change the size of the base station identifier index and the size of the terminal identifier index constituting the temporary terminal identifier. The method of claim 7, wherein The process of performing the network re-entry procedure, When the ranging request signal including the temporary terminal identifier is received, allocating a terminal identifier to the terminal that has transmitted the ranging request signal; And transmitting a ranging response signal including the allocated terminal identifier to the terminal. The method of claim 10, And when the network re-entry procedure is completed, communicating with the terminal using a terminal identifier assigned to the terminal. The method of claim 7, wherein Identifying at least one base station identifier index allocated from at least one neighboring base station; And including the at least one base station identifier index in a neighbor base station information message (NBR (NeighBoR) -ADV (ADVertisement)) including at least one neighbor base station information and transmitting the at least one base station identifier index to at least one terminal. How to. The method of claim 7, wherein Identifying at least one base station identifier index allocated from at least one neighboring base station; And including the at least one base station identifier index through at least one handover message transmitted to the terminal for handover to the at least one terminal. . A terminal device for handover in a wireless communication system, A transmitter for transmitting a signal, Receiving unit for receiving a signal, A terminal identifier configuration unit configured to construct a temporary terminal identifier by using a base station identifier index allocated from a target base station for handover by a serving base station and a terminal identifier index allocated by the terminal to the serving base station; In the case of handover to a target base station, the network terminal reentry procedure with the target base station is controlled using the temporary terminal identifier configured by the terminal identifier configuration unit, and the network reentry procedure with the target base station is completed. And a control unit for controlling communication with the serving base station. The method of claim 14, The controller identifies at least one base station identifier index assigned by the serving base station from at least one neighboring base station through a neighbor base station information message (NBR (NeighBoR) -ADV (ADVertisement)) provided from the serving base station. Device. The method of claim 14, The control unit may identify at least one base station identifier index assigned by the serving base station from at least one neighboring base station through a handover message of at least one handover message provided from the serving base station for handover. Device characterized in that. The method of claim 14, The terminal identifier configuration unit, characterized in that for changing the size of the base station identifier index and the terminal identifier index constituting the temporary terminal identifier. The method of claim 14, And the control unit controls to perform communication with the serving base station until the network re-entry procedure with the target base station is completed using the terminal identifier assigned by the serving base station. The method of claim 14, When the network re-entry procedure with the target base station is completed, the controller controls to terminate communication with the serving base station and uses the terminal base station assigned by the target base station through the network re-entry procedure. And control to perform communication. A base station apparatus for supporting handover of a terminal in a wireless communication system, A transmitter for transmitting a signal, Receiving unit for receiving a signal, A base station identifier index setting unit for allocating at least one base station identifier index to at least one neighboring base station; A wired interface for transmitting the base station identifier index allocated to the neighbor base station to at least one neighbor base station; When a handover of a terminal is instructed from a neighbor base station through the wired interface, a temporary terminal for the terminal using the terminal identifier index allocated to the neighbor base station and the terminal identifier handovered by the neighbor base station A terminal identifier constructing unit constituting the identifier; And a control unit controlling to perform a network re-entry procedure with the terminal by using the temporary terminal identifier. The method of claim 20, The terminal identifier configuration unit, characterized in that for changing the size of the base station identifier index and the terminal identifier index constituting the temporary terminal identifier. The method of claim 20, The control unit allocates a new terminal identifier to the terminal through a network reentry procedure with the terminal. The method of claim 20, The control unit includes at least one base station identifier index provided from at least one neighbor base station through the wired interface in a neighbor base station information message (NBR (NeighBoR) -ADV (ADVertisement)) including at least one neighbor base station information. To transmit to at least one terminal. The method of claim 20, The controller may include at least one base station identifier index provided from at least one neighboring base station through the wired interface in any one of the at least one handover message transmitted to the terminal for handover. Device for transmitting to the terminal.

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