KR101551349B1 - Apparatus and method for allocating a terminal identifier in a wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and a method for providing a handover using a terminal identifier in a wireless communication system. A method for handover using a terminal identifier includes the steps of: checking at least one base station identifier index allocated by the serving base station from at least one neighbor base station; checking a target base station for handover; Comprising the steps of: constructing a temporary terminal identifier using a base station identifier index allocated by the serving base station from the target base station and a terminal identifier index allocated by the terminal from the serving base station; Performing a re-entry procedure, and performing communication with the serving base station until the network re-entry procedure with the target base station is completed.

Handover, MS ID, BS ID index, temporary MS ID

Description

[0001] APPARATUS AND METHOD FOR ALLOCATING MOBILE IDENTIFICATION IN WIRELESS COMMUNICATION SYSTEM [0002]

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 allocating a terminal identifier including neighbor base station information in a wireless communication system.

In a wireless communication system, a BS and a UE identify a service connection using a CID (Connection Identification). For example, in a communication system according to IEEE (Institute of Electrical and Electronics Engineers) 802.16 standard, a base station and a terminal are configured with 16 bits, such as a basic CID, a first management CID, CID. Also, when providing a new service, the BS and the UE generate a transmission CID for a new service connection. Then, the base station configures the map to include the basic CID of the corresponding terminal in order to identify the resource allocation information for the specific terminal. For example, the base station configures a downlink (DL) -MAP to include the CID of the terminal as shown in FIG.

FIG. 1 shows a configuration of a map using a connection identifier in a wireless communication system according to the related art.

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

The UE can confirm the resource allocation information allocated by the BS through the MAP including its CID among the maps received from the BS.

The transmitting end includes a CID indicating a service connection in a MAC (Media Access Control) header of the data. In this case, the receiving end can check through the CID included in the MAC header of the received data whether the data is data for service connection allocated to the receiving end.

As described above, the BS and the UE identify the service connection using the CID. Therefore, each CID must have a unique value within the cell managed by the base station, without overlapping with each other.

When the terminal performs handover, the terminal must 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 being duplicated. In this case, the terminal must update all the CIDs even if the CIDs used by the serving base station are partially overlapped with the CIDs used by the other terminals in the target base station. Herein, the serving BS refers to a base station to which the UE has connected before performing a handover, and the target BS refers to a base station newly connected to the UE through handover.

When the MS performs handover, the serving BS transmits a handover response message (HO (HandOver) -RSP (RSPonse)) to the CID information allocated to the MS by the candidate BSs to which the MS can perform handover for updating the CID of the MS. To the terminal. Accordingly, the size of the handover response message becomes large.

In addition, the transmitting end includes the CID in the corresponding data so that the receiving end can identify the service connection to the received data. Accordingly, there occurs a problem that CIDs included in the data serve as a fixed overhead for transmission data.

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

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

It is still another object of the present invention to provide an apparatus and method for sharing base station identifier indexes allocated by base stations to neighbor base stations in a wireless communication system.

It is another object of the present invention to provide an apparatus and method for performing communication with a terminal accessing through a handover using a temporary terminal identifier configured by using a base station identifier index allocated to a neighboring base station in a base station of a wireless communication system .

According to a first aspect of the present invention, there is provided a method for handover in a terminal of a wireless communication system, the method comprising: determining, by a serving base station, at least one base station identifier index allocated from at least one neighbor base station Determining a target base station to which the serving base station is to be handed over; configuring a temporary terminal identifier using the base station identifier index allocated by the serving base station from the target base station and the terminal identifier index allocated by the terminal from the serving base station; Performing a network re-entry procedure with the target base station using the temporary terminal identifier; and performing communication with the serving base station until the network re-entry procedure with the target base station is completed .

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: allocating at least one base station identifier index to at least one neighbor base station; Configuring a temporary terminal identifier for the terminal using the base station identifier index allocated to the neighbor base station and the terminal identifier index allocated from the neighboring base station by the terminal performing the handover, And performing a network re-entry procedure with the MS using the network re-entry procedure.

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, a base station identifier index allocated from a target base station for handover by the serving base station, And a terminal identifier constructing unit for constructing a temporary terminal identifier using the terminal identifier index allocated by the terminal from the serving base station and a terminal identifier configured by the terminal identifier configuring unit in the case of handing over to the target base station And a controller for performing a network re-entry procedure with the target base station and controlling communication with the serving base station until the network re-entry 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 A base station identifier index setting unit for assigning an index to a neighbor base station; a wire interface for transmitting the base station identifier index allocated to a neighbor base station to at least one neighbor base station; A terminal identifier constructing unit for constructing a temporary terminal identifier for the terminal using a base station identifier index allocated to the neighbor base station and a terminal identifier index allocated from the neighboring base station by the terminal performing handover; The network And a control unit for controlling to perform a re-entry procedure.

As described above, in the wireless communication system, the terminal performing the handover performs communication with the target base station newly connected through the handover using the terminal identifier configured to indicate the neighbor base station, ID) of the target base station can be reduced, and there is an advantage that communication can be performed with a newly-connected target base station through a handover without a process of assigning a CID.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to 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. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, a technique for improving handover performance using a UE identifier configured to indicate a neighbor BS in a wireless communication system will be described.

In the following description, a base station that has been provided with a service before a handover of a base station constituting a wireless communication system is referred to as a serving base station, and a base station newly accessed through a handover of the terminal is referred to as a target base station.

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

In addition, the BS allocates an MS ID to the MS, and then generates a Flow ID to indicate the service creation with the MS and the connection supporting the MS ID. Accordingly, the transmitting end includes a 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 To confirm that the data is data for service connection assigned to the user.

The BS and the MS may perform communication using an MS ID configured to indicate neighbor BS information as shown in FIG.

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

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 a BS to which the MS ID index 210 is allocated. For example, when the MS ID index 210 constituting the MS ID is allocated from the BS in communication, the BS ID index 200 of the MS ID is set to '0'. That is, when it is assumed that the MS ID is composed of the 11-bit MS ID index 210 and the 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 can be changed as needed.

On the other hand, when the neighbor BS has allocated 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 allocated to the neighbor BS by the communicating BS do. That is, the BS can set the BS ID index 200 of the MS ID using the BS ID index allocated to the neighbor BSs as shown in FIG.

FIG. 3 illustrates a configuration of a wireless communication system for allocating a BS ID index of neighbor BSs according to an embodiment of the present invention.

As shown in FIG. 3, the first base station 310 allocates BS ID indexes to neighbor BSs as shown in Table 1 below.

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 second BS 320 allocates BS ID indexes to neighbor BSs as shown in Table 2 below.

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

Also, the third base station 330 allocates BS ID indexes to adjacent base stations as shown in Table 3 below.

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

BSs allocate BS ID indexes to neighboring BSs as shown in Table 1, Table 2, and Table 3, respectively. Accordingly, when the MS ID of the MS is configured using the MS ID index allocated by the neighbor BS, the BS uses the BS ID index allocated to the neighbor BS by itself and the MD ID index allocated to the MS by the neighbor BS Thereby configuring the MS ID.

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

FIG. 4 shows 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 MS in order to identify the MS for the resource allocation information included therein. At this time, the MS ID of the MS includes a BS ID index indicating BS information on which the MS ID index is allocated as shown in FIG. Therefore, if the BS constituting the downlink map configures the MS ID 3 401 using the MS ID index assigned by the BS, the downlink map includes the MS ID 3 401 with the BS ID index set to '00000' . Meanwhile, when the MS ID 5 (403) is configured using the MS ID index allocated by the neighbor BS in the BS constituting the downlink map, the downlink map indicates that the BS ID index is the BS ID allocated to the BS And an MS ID 5 (403) set to an ID index. In the following description, the MS ID configured using the MS ID index allocated by the neighbor BS, such as the MS ID 5 403, is referred to as a temporary MS ID.

As described above, the base station transmits MS IDs to each downlink map so that the MS can identify the downlink map. That is, the BS can allocate resources or perform communication with the MS using the temporary MS ID of the MS before allocating the MS ID to the MS that is handing over from the neighbor BS.

The MS can identify the downlink map including its resource allocation information through the MS ID included in the downlink map. As shown in FIG. 4, when the base station constructs and transmits a downlink map including a temporary MS ID, the terminal must be able to configure a temporary MS ID included in the downlink map. In order to configure a temporary MS ID equal to the temporary MS ID configured by the BS, the MS must know the BS ID index allocated to the neighbor BS by the BS. Accordingly, the BS transmits the BS ID index information allocated from the neighbor BS to the MS. For example, as shown in FIG. 5, the BS includes BS ID index information allocated to neighbor BSs in an NBR (NeighborBoR) -ADV (ADVertisement) message, Lt; / RTI >

FIG. 5 illustrates a procedure for transmitting a BS ID index from a BS to a MS in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 5, in step 501, the BS checks BS ID indexes allocated from neighbor BSs. For example, in FIG. 3, the BS 2 320 identifies the BS ID index 5 allocated from the BS 1 310 and the BS ID index 2 allocated from the BS 3 330 through the backbone.

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

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.

Thereafter, the base station terminates the present algorithm.

As described above, the terminal, which has obtained the BS ID index information allocated from the neighbor BSs by the serving BS, performs the handover as shown in FIG.

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

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

If the neighbor BS information message is received from the serving BS, the MS proceeds to step 603 where the serving BS checks BS ID index information received from neighbor BSs in the neighbor BS information message. Thereafter, the serving BS stores BS ID index information allocated from neighbor BSs

After the serving BS confirms and stores the BS ID index information allocated from the neighbor BSs, the MS proceeds to step 605 and determines a target BS to perform handover through handover negotiation with the serving BS. For example, the MS requests handover to the serving BS to obtain information on candidate BSs capable of supporting its own handover. Then, the terminal determines a target base station for handover among the candidate base stations.

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

After transmitting the handover indication message, the MS proceeds to step 609 and configures a temporary MS ID using the BS ID index allocated to the serving BS by the target BS. For example, the UE configures a temporary MS ID using a BS ID index allocated to the serving BS by the serving BS and an MS ID index allocated by the serving BS itself.

After configuring the temporary MS ID, the MS proceeds to step 611 and performs communication with the target BS using the temporary MS ID. For example, the MS confirms a resource allocation message transmitted from the target BS using the temporary MS ID. Also, the terminal transmits a bandwidth request message (BW (Bandwidth) -Req (Request)) to the target base station using the temporary MS ID.

In step 613, the MS receives an MS ID through a ranging procedure with the target BS. For example, the MS determines the MS ID assigned by the target BS in a ranging response message (RNG-RSP (Response)).

In step 615, the MS communicates with the target BS using the allocated MS ID.

Thereafter, the terminal ends the algorithm.

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

6 illustrates a case where a UE requests handover to a serving BS and determines a target BS. However, the present invention can be similarly applied to a case in which a serving base station requests a handover or a serving base station is determined in the serving base station. In this case, the MS selectively transmits a handover indication message to the serving BS. That is, the UE may or may not transmit a handover indication message to the serving BS.

As described above, the terminal and the target base station can communicate using the temporary MS ID. In this case, the UE and the target BS can use the same Flow ID that was generated for the service connection between the UE and the serving BS. That is, if the target BS does not instruct the target BS to change Flow IDs used by the MS for service connection with the serving BS, the target BS and the target BS can 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.

FIG. 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 BS proceeds to step 701 and allocates BS ID indexes to neighbor BSs. That is, the target BS transmits the BS ID index allocated to the neighbor BSs to the neighbor BSs through the backbone.

After allocating a BS ID index to the neighbor BSs, the target BS proceeds to step 703 and checks whether the neighbor BS has been informed of the handover of the MS. For example, the target base station determines whether a handover indication message of the terminal is received from the serving base station of the terminal through the backbone.

If the target BS is informed of the handover of the MS, the target BS proceeds to step 705 to configure a temporary MS ID for the MS using the BS ID index allocated to the neighbor BS that has notified the handover of the MS. For example, the target BS checks the MS ID index allocated to the MS by the neighbor BS through the handover indication message. Then, the target BS combines the BS ID index allocated to the neighbor BS that has transmitted the handover indication message and the MS ID index allocated to the MS to which the neighbor BS is handed over, thereby forming a temporary MS ID.

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

In step 709, the target BS configures an MS ID to be allocated to the MS.

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

After transmitting the MS ID, the target BS proceeds to step 713 and performs communication 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 sequentially performed or may be performed in parallel. Also, 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.

FIG. 8 illustrates a handover procedure of a terminal in a wireless communication system according to an embodiment of the present invention. Only the signals transmitted and received by the terminal 801, the serving base station 803, the terminal 801 and the target base station 805 using radio resources are shown.

Referring to FIG. 8, when a terminal 801 which has received a service from the serving base station 803 requests handover, the terminal 801 transmits a handover request message (HandOver - REQ (Request)) (step 811).

Upon receiving the handover request message, the serving BS 803 identifies a candidate BS capable of supporting handover of the MS 801 among neighbor BSs to which the MS 801 can perform handover. At this time, the serving BS 803 identifies a candidate BS capable of supporting handover of the MS 801 through a backbone.

The serving BS 803 transmits a handover response message (HO-RSP (Response)) including the candidate BS information supporting handover of the MS 801 to the MS 801 (Step 813 ).

When the handover response message is received, the UE 801 selects a target base station 805 for handover among the candidate base stations confirmed through the handover response message. In step 815, the MS 801 transmits a handover indication message (HO IND (Indication)) to the serving BS 803 to inform the target BS 805 of the handover to the target BS 805. Herein, the handover indication message includes the target base station 805 information.

After transmitting the handover indication message, the serving base station 803 constructs a temporary MS ID using the BS ID index allocated from the target base station 805. For example, the SS 801 checks the BS ID indexes allocated to the serving BS 803 from the neighbor BSs through the neighbor BS information message provided from the serving BS 803.

The serving base station 803 confirms the target base station 805 selected by the terminal 801 for handover through the handover indication message. At this time, the serving base station 803 instructs the target base station 805 to perform handover of the terminal 801 through the backbone.

In step 817, the target base station 805 allocates resources to the terminal 801 when it is instructed by the serving base station 803 to perform handover of the terminal 801 through the backbone. For example, the target base station 805 transmits the BS ID index to the serving BS 803 using the BS ID index allocated to the serving BS 803 and the MD ID index allocated from the serving BS 803 by the MS 801, Lt; RTI ID = 0.0 > MS < / RTI > Then, the target base station 805 transmits the resource allocation message for the MS 801 to the MS 801, including the temporary MS ID. At this time, the terminals located in the service area of the target base station 805 recognize the temporary MS ID as a different MS ID than its MS ID, and do not use a region corresponding to the resource allocation message including the temporary MS ID . Meanwhile, the MS 801 can confirm a resource allocation message transmitted by the target BS 805 using the temporary MS ID.

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

The terminal 801 transmits a bandwidth request message (BW (Bandwidth) -Req) and uplink data using resources allocated from the target base station 805 (step 821). At this time, the MS 801 includes a temporary MS ID in the bandwidth request message and transmits the MS message to the target BS 805. When the target base station 805 does not instruct the terminal 801 to change the Flow ID used for the service connection between the serving base station 803 and the serving base station 803, And transmits the uplink data using the Flow ID used for the service connection with the base station.

Also, the terminal 801 performs a ranging procedure with the target base station 805 (steps 823 and 825). For example, the UE 801 transmits a ranging request message (RNG (Ranging) REQ (Request)) to the target BS 805 using the resource obtained by transmitting the ranging code to the target BS 805, (Step 823). The target base station 805 transmits a response message (RNG RSP (Response)) for the ranging request message received from the AT 801 to the AT 801 in step 825. At this time, the target base station 805 includes the MS ID information newly allocated to the MS 801 in the response message, and transmits the MS ID information to the MS 801.

The UE 801 and the target base station 805 may sequentially perform a resource allocation procedure and a data transmission / reception procedure (steps 817 to 821) and a ranging procedure (steps 823 to 825) . Also, the ranging procedure (steps 823 to 825) may be performed before the resource allocation procedure and the data transmission / reception procedure (steps 817 to 821).

8, it is assumed that the MS 801 requests handover to the serving BS 803 and determines the target BS 805. FIG. However, the present invention can be similarly applied to a case where a serving base station 803 requests a handover or a serving base station 803 determines a target base station 805. In this case, the MS 801 selectively transmits a handover indication message to the serving BS 803. That is, the MS 802 may transmit a handover indication message to the serving BS 803 or not.

In the above-described embodiment, the serving BS includes the BS ID index information allocated from the neighbor BSs in the neighbor BS information message and transmits the information to the MS. Accordingly, the MS confirms the BS ID index information received from the neighbor BSs by the serving BS through the neighbor BS information message provided from the serving BS.

In another embodiment, the BS may transmit a handover message including the BS ID index information allocated from the neighbor BSs to the MS during the handover of the MS. At this time, the BS transmits all BS ID index information or some BS ID index information allocated from neighbor BSs to the MS.

Accordingly, as shown in FIG. 9, the UE can check the BS ID index information received from the neighbor BSs in the serving BS in the handover message provided from the serving BS during the handover process.

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

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

If it is determined to perform the handover, the MS proceeds to step 903 and requests handover to the serving BS.

In step 905, the MS determines whether a handover response message is received from the serving BS.

If a handover response message is received from the serving BS, the MS proceeds to step 907 and obtains information of candidate BSs capable of supporting its own handover in the handover response message. At this time, in the handover response message, the MS confirms the BS ID index that the serving BS has received from the candidate BSs.

After confirming the candidate base station, the terminal proceeds to step 909 and determines a target base station to perform handover among the candidate base stations.

Thereafter, the MS proceeds to step 911 and configures a temporary MS ID for performing communication with the target BS. For example, the UE configures a temporary MS ID by using the BS ID index allocated by the serving base station from the target BS and the MS ID index allocated by the serving BS.

After configuring the temporary MS ID, the MS proceeds to step 913 and performs a network re-entry procedure with the target BS using the temporary MS ID.

Thereafter, the MS proceeds to step 917 and determines whether the network re-entry procedure with the target BS has been completed successfully.

If the network re-entry procedure with the target base station is not completed, the mobile station proceeds to step 913 and continuously performs the network re-entry procedure with the target base station.

When the network re-entry procedure with the target base station is completed, the MS proceeds to step 919, releases the connection with the serving BS, and performs communication with the target BS. At this time, the MS performs communication with the target BS using the MS ID allocated from the target BS through network re-entry.

In step 909, the terminal selects a target base station, and then proceeds to step 915 to perform communication with the serving base station. At this time, the MS performs communication with the serving BS using the MS ID allocated from the serving BS.

Thereafter, the MS proceeds to step 917 and determines whether the network re-entry procedure with the target BS has been successfully completed.

If the network re-entry procedure with the target base station is not completed, the mobile station proceeds to step 915 and continuously performs communication with the serving base station.

On the other hand, if the network re-entry procedure with the target base station is completed, the mobile station disconnects from the serving base station in step 919, and performs communication with the target base station. At this time, the MS performs communication with the target BS using the MS ID allocated from the target BS through network re-entry.

Thereafter, the terminal ends the algorithm.

As described above, the MS confirms the BS ID index information allocated from the neighbor BSs through the handover response message. At this time, when the serving base station determines whether or not the serving base station supports the handover of the mobile station, the neighbor base station can transmit the BS ID index information allocated to the serving base station to the serving base station together with the handover support of the mobile station.

9 illustrates a case where a UE requests handover to a serving BS and determines a target BS. However, the present invention can be similarly applied to a case in which a serving base station requests a handover or a serving base station is determined in the serving base station. In this case, the MS selectively transmits a handover indication message to the serving BS. That is, the UE may or may not transmit a handover indication message to the serving BS.

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

FIG. 10 illustrates a handover procedure of a UE in a wireless communication system according to another embodiment of the present invention. Only the signals transmitted and received between the terminal 1001, the serving base station 1003 and the target base station 1005 using radio resources are shown.

Referring to FIG. 10, when the MS 1001 receiving a service from the serving BS 1003 desires a handover, the MS 1001 transmits a handover request message (HO-REQ) to the serving BS 1003 (Step 1011).

Upon receiving the handover request message, the serving BS 1003 identifies candidate BSs capable of supporting handover of the MS 1001 among neighbor BSs to which the MS 1001 can perform handover. For example, the serving BS 1003 identifies candidate BSs capable of supporting handover of the MS 1001 among the neighbor BSs through a backbone.

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

The MS 1001 checks the BS ID indexes received from the candidate base stations of the candidate base stations and the serving BS 1003 that can be handed over through the handover response message.

Also, the UE 1001 selects a target BS 1005 for handover among the candidate BSs.

Thereafter, the MS 1001 may continue to communicate with the serving BS until the network re-entry procedure with the target BS 1005 is completed (step 1015). At this time, the MS 1001 communicates with the serving BS 1003 using the MS ID allocated from the serving BS 1003.

Also, after the target BS 1005 selects the target BS 1005, the MS 1001 configures a temporary MS ID using the BS ID index allocated to the serving BS 1003 by the target BS 1005. For example, the MS 1001 constructs a temporary MS ID using the BS ID index allocated from the target BS 1005 and the MS ID index allocated by the serving BS 1003.

Thereafter, the MS 1001 performs a network re-entry procedure with the target BS 1005 using the temporary MS ID (steps 1017 and 1019). For example, the UE 1001 transmits a ranging request message (RNG REQ) to the target base station 1005 using the resource obtained by transmitting the 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 AT 1001 to the AT 1001 (step 1019). At this time, the target base station 1005 includes the MS ID information newly allocated to the MS 1001 in the response message, and transmits the MS ID information to the MS 1001.

At this time, the MS 1001 may perform the communication with the serving BS 1003 (step 1015) and the network re-entry procedure with the target BS 1005 (steps 1017 and 1019) .

The BS may transmit a handover message including the BS ID index information allocated from the neighbor BSs to the MS in the handover process of the MS in the above embodiment. Accordingly, the UE can check the BS ID index information that the serving BS receives from the neighbor BSs in the handover message provided from the serving BS during the handover process.

In another embodiment, the BS may transmit a separate message including BS ID index information allocated from neighbor BSs to the MS. At this time, the BS transmits all BS ID index information or some BS ID index information allocated from neighbor BSs to the MS.

Accordingly, the MS can check the BS ID index information allocated by the serving BS in the separate message including the BS ID index information from the neighbor BSs.

The following description explains the configuration of a terminal for handover to a target base station.

FIG. 11 shows a block configuration of a terminal for handover in a wireless communication system according to an embodiment of the present invention.

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 an antenna to a receiver 1110.

The receiver 1110 includes an RF processor 1111, an analog / digital converter 1113, an Orthogonal Frequency Division Multiplexing (OFDM) demodulator 1115, a decoder 1117, and a message processor 1119 .

The RF processor 1111 converts the high frequency signal received from the duplexer 1100 into a baseband analog signal. The analog-to-digital converter 1113 converts the analog signal supplied from the RF processor 1111 into digital sample data and outputs the digital sample data. The OFDM demodulator 1115 converts the time-domain sample data supplied from the A / D converter 1113 to frequency-domain data through Fourier transform and outputs the data. For example, the OFDM demodulator 1115 transforms time-domain sample data into frequency-domain data 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 the control message 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 the target base station, and provides the detection result to the controller 1120.

The controller 1120 controls overall operation and handover of the terminal. For example, the controller 1120 checks the BS ID index information received from the neighbor BSs by the serving BS through the neighbor BS information message provided from the message processor 1119. For example, the control unit 1120 can check the BS ID index information received from the neighbor BSs by the serving BS through the handover message provided from the message processor 1119. For example, the controller 1120 may check the BS ID index information received from the neighbor BSs through the separate message including the BS ID index information provided from the message processor 1119 .

Also, the controller 1120 determines whether to perform handover in consideration of signal strength. If the handover is to be performed, the controller 1120 requests handover to the serving base station and selects a target base station to perform handover among the candidate base stations. At this time, the controller 1120 acquires the candidate base station information in the handover response message provided from the message processor 1119.

The control unit 1120 selects the target base station and controls the base station to perform a network re-entry procedure with the target base station using the temporary MS ID provided from the MS ID configuration unit 1123. [ At this time, 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 communication with the serving base station using the MS ID allocated by the serving base station.

The storage unit 1121 stores the BS ID index information received from the neighbor BSs by the serving BS checked by the controller 1120.

When determining the target BS in the controller 1120, the MS ID configuration unit 1123 checks the BS ID index allocated from the target BS in the storage unit 1121. Then, the MS ID configuration unit 1123 forms a temporary MS ID for communicating with the target base station by combining the determined BS ID index with the MS ID index allocated from the serving 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 according to the control of the controller 1120. For example, when determining the handover in the controller 1120, the message generator 1131 generates a handover request message for requesting handover to the serving base station. Also, when the control unit 1120 determines a target base station for handover, the message generation unit 1131 generates a handover indication message for instructing handover to the target base station. Also, when performing communication with the target base station using the temporary MS ID according to the control of the controller 1120, the message generator 1131 configures a bandwidth request message including the temporary MS ID. Also, if the target base station does not instruct the flow ID change, the message generator 1131 constructs uplink data using the Flow ID used for the service connection with the serving base station.

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

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

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

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

In another embodiment, the controller 1120 selects a target base station, and then instructs the serving base station to perform handover. The control unit 1120 then controls the target base station to perform communication using the temporary MS ID provided from the MS ID configuration unit 1123. [ At this time, the controller 1120 performs communication with the target base station and performs a network re-entry procedure with the target base station. For example, the controller 1120 may control the communication with the target base station and the network re-entry procedure sequentially or may be controlled to be performed in parallel. Also, the controller 1120 may control the network re-entry procedure with the target base station to be performed before the communication procedure with the target base station.

The following explains the configuration of a base station that controls handover of a terminal.

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.

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 an antenna to a receiver 1210.

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

The RF processor 1211 converts the high frequency signal received from the duplexer 1200 into a baseband analog signal. The analog-to-digital converter 1213 converts the analog signal supplied from the RF processor 1211 into digital sample data and outputs the digital sample data. The OFDM demodulator 1215 converts the time-domain sample data provided from the A / D converter 1213 to frequency-domain data through Fourier transform and outputs the data. For example, the OFDM demodulator 1215 transforms time-domain sample data into frequency-domain data 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 a handover request message and a handover indication message provided from the terminal providing the service, and provides the handover request message and the handover indication message to the controller 1220.

The controller 1220 controls overall operation of the BS and handover of the MS located in the service area. For example, the controller 1220 controls to transmit BS ID index information allocated from neighboring base stations to the terminals located in the service area through the backbone. Also, the controller 1220 controls the BS ID index setting unit 1221 to transmit the BS ID index allocated to the neighbor BSs to the neighbor BSs through the backbone.

In addition, the controller 1220 identifies the neighbor BSs to which the MS, which has requested handover, can perform handover through the handover request message provided from the message processor 1219. Then, the controller 1220 determines whether the neighbor BSs can support handover of the MS through the backbone.

Also, if the handover indication message is received from the message processor 1219, the controller 1220 identifies a target base station for handover. Then, the controller 1220 instructs the target base station through the backbone to perform handover of the terminal.

In addition, when the control unit 1220 receives a handover request from the neighboring base station through the backbone, the control unit 1220 allocates resources to the terminal included in the handover indication message. At this time, the controller 1220 controls to configure a resource allocation message using the temporary MS ID of the MS configured in the MS ID configuration unit 1223. [ If an MS ID is allocated to the MS, the controller 1220 controls to configure a resource allocation message using the MS ID allocated to the MS.

The BS ID index setting unit 1221 determines a BS ID index to be allocated to neighbor BSs.

The MS ID configuration unit 1223 configures a temporary MS ID for performing communication with a terminal that has not assigned an MS ID and an MS ID to be allocated to the terminal. Here, in the case of configuring the temporary MS ID, the MS ID configuration unit 1223 determines whether the MS ID allocated to the neighbor BS that has instructed handover of the MS and the MS ID The indexes are combined to construct 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 according to the control of the controller 1220. For example, the message generator 1231 configures a neighbor BS information message to include BS ID index information allocated from neighbor BSs. When the control unit 1220 confirms handover support of neighbor base stations through the backbone, the message generator 1231 generates a handover response message including information on neighbor base stations capable of supporting handover of the user equipment . In addition, when the control unit 1220 allocates resources to the UE in response to a handover of a terminal through a backbone, the message generator 1231 generates a resource allocation message including the resource allocation information. At this time, the message generator 1231 configures a resource allocation message including the temporary MS ID of the MS. When the MS ID is allocated to the MS according to the control of the controller 1220, the message generator 1231 configures a resource allocation message including the MS ID allocated to the MS. Also, if the UE does not instruct to change the Flow ID of the UE, 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 codes and modulates a transmission signal or a message provided from the message generator 1231 according to a modulation level (MCS level).

The OFDM modulator 1235 transforms the frequency domain data provided from the encoder 1233 into the time domain sample data (OFDM symbol) through inverse Fourier transform and outputs the transformed data. For example, the OFDM modulator 1235 transforms the frequency domain data into the time domain sample data (OFDM symbol) through an inverse fast Fourier transform.

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

Although not shown, the base station further comprises a wired interface for performing communication with an adjacent base station. That is, the BS transmits the BS ID index allocated to the neighbor BS through the wired interface to the neighbor BSs, and receives the BS ID index allocated from the neighbor BSs through the wired interface.

In the above-described embodiment, the BS transmits the BS ID index information allocated from the neighbor BSs to the MSs located in the service area using the neighbor BS information message. In another embodiment, the BS may transmit the BS ID index information allocated from the neighbor BSs to the MS using the handover message. In this case, the message generator 1231 generates a handover message including the BS ID index information allocated from the neighbor BSs. In another embodiment, the BS may transmit a separate message including the BS ID index information allocated from the neighbor BSs to the MS. In this case, the message generator 1231 generates a separate message including the BS ID index information allocated from the neighbor BSs.

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. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a diagram showing a configuration of a map using a connection identifier in a wireless communication system according to the related 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 a BS ID index of neighbor BSs according to an embodiment of the present invention;

4 is a diagram showing 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 BS ID index from a BS to a MS in a wireless communication system according to an embodiment of the present invention;

6 is a flowchart 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 flowchart illustrating a procedure for performing a 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 diagram showing a block configuration of a terminal for handover in a wireless communication system according to an embodiment of the present invention, and Fig.

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 at a terminal of a wireless communication system, Identifying at least one base station identifier index allocated by the serving base station from at least one neighbor base station; Identifying a target base station for handover; Comprising the steps of: constructing a temporary terminal identifier using a base station identifier index allocated by the serving base station from the target base station and a terminal identifier index allocated by the terminal from the serving base station; Performing a network re-entry procedure with the target base station using the temporary terminal identifier; And performing communication with the serving base station until the network re-entry procedure with the target base station is completed. The method according to claim 1, The step of checking the base station identifier index comprises: And a step of checking at least one BS ID index allocated by the serving BS from at least one neighbor BS through an NBC (NeighborBoR) -ADV (ADVertisement) message provided from the serving BS Lt; / RTI > The method according to claim 1, The step of checking the base station identifier index comprises: And checking at least one BS ID index allocated by the serving BS from at least one neighbor BS through at least one handover message received from the serving BS for handover ≪ / RTI > The method according to claim 1, Wherein the temporary terminal identifier is capable of changing the size of the base station identifier index and the size of the terminal identifier index constituting the temporary terminal identifier. The method according to claim 1, Wherein the step of performing communication with the serving base station comprises: And performing communication with the serving base station using the terminal identifier allocated from the serving base station. The method according to claim 1, Terminating communication with the serving base station when the network re-entry procedure with the target base station is completed; Further comprising the step of performing communication with the target base station using the terminal identifier allocated from 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 neighbor base station; A step of constructing a temporary terminal identifier for the terminal using the base station identifier index allocated to the neighbor base station and the terminal identifier index allocated by the terminal performing handover from the neighbor base station when the handover of the terminal is instructed from the neighbor base station and, And performing a network re-entry procedure with the terminal using the temporary terminal identifier. 8. The method of claim 7, Wherein the step of allocating the BS ID comprises: Allocating at least one base station identifier index to at least one neighbor base station; And transmitting a response signal for the handover request to the neighbor BS when the handover of the MS is requested from at least one neighbor BS by transmitting the response signal including the BS ID assigned to the neighbor BS to the neighbor BS Way. 8. The method of claim 7, Wherein the temporary terminal identifier is capable of changing the size of the base station identifier index and the size of the terminal identifier index constituting the temporary terminal identifier. 8. The method of claim 7, The process of performing the network re- Allocating a terminal identifier to a terminal that has transmitted the ranging request signal when a ranging request signal including the temporary terminal identifier is received; And transmitting the ranging response signal including the allocated terminal identifier to the terminal. 11. The method of claim 10, Further comprising the step of performing communication with the terminal using the terminal identifier allocated to the terminal when the network re-entry procedure is completed. 8. The method of claim 7, Identifying at least one BS ID index allocated from at least one neighbor BS, (NBR) -ADV (ADVertisement) message including at least one neighbor base station information to at least one terminal by including the at least one base station identifier index in an NBR (NeighborBoR) -ADV (ADVertisement) How to. 8. The method of claim 7, Identifying at least one BS ID index allocated from at least one neighbor BS, And transmitting the at least one base station identifier index to at least one terminal through one of handover messages transmitted from the at least one handover message to the terminal for handover . A terminal apparatus for handover in a wireless communication system, A transmitter for transmitting a signal, A receiver for receiving a signal, A terminal identifier constructing unit for constructing a temporary terminal identifier 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 from the serving base station; Wherein the control unit controls to perform a network re-entry procedure with the target base station using the temporary terminal identifier configured in the terminal identifier configuration unit when handing over to the target base station, And a controller for controlling communication with the serving base station. 15. The method of claim 14, The control unit identifies at least one BS ID index allocated to the serving BS from at least one neighbor BS through a neighbor BS information message (NBR (NeighborBoR) -ADV (ADVertisement)) provided from the serving BS . 15. The method of claim 14, The control unit checks at least one BS ID index allocated by the serving BS from at least one neighbor BS through at least one handover message among the at least one handover messages provided from the serving BS for handover Lt; / RTI > 15. The method of claim 14, Wherein the terminal identifier configuration unit is capable of changing a size of a base station identifier index and a size of a terminal identifier index constituting the temporary terminal identifier. 15. The method of claim 14, Wherein the controller 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 allocated from the serving base station. 15. The method of claim 14, Wherein the control unit controls to terminate the communication with the serving base station when the network re-entry procedure with the target base station is completed, and controls the target base station using the terminal identifier allocated from the target base station through the network re- And performs communication to perform communication. A base station apparatus for supporting handover of a terminal in a wireless communication system, A transmitter for transmitting a signal, A receiver for receiving a signal, A base station identifier index setting unit for assigning at least one base station identifier index to at least one neighbor base station; A wired interface for transmitting the BS ID assigned to a neighbor BS to at least one neighbor BS; When a handover of a terminal is instructed from the neighboring base station through the wired interface, the base station identifier index allocated to the neighbor base station and the terminal identifier index allocated from the neighboring base station to the handover terminal, A terminal identifier constituting unit which constitutes an identifier, And a controller for performing a network re-entry procedure with the terminal using the temporary terminal identifier. 21. The method of claim 20, Wherein the terminal identifier configuration unit is capable of changing a size of a base station identifier index and a size of a terminal identifier index constituting the temporary terminal identifier. 21. The method of claim 20, Wherein the control unit allocates a new terminal identifier to the terminal through a network re-entry procedure with the terminal. 21. 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 to an adjacent base station information message (NBR (NeighborBoR) -ADV (ADVertisement)) including at least one neighbor base station information To the at least one terminal. 21. The method of claim 20, The control unit may include at least one base station identifier index provided from at least one neighbor base station through the wireline interface in at least one handover message among at least one handover message transmitted to the terminal for handover, To the terminal of the terminal.

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