JP5614907B2 - Paging message transmission / reception method and apparatus using band information in wireless communication system - Google Patents

Description

  The present invention relates to a radio communication system, and more particularly, to a method and apparatus for transmitting and receiving a paging message in a radio communication system using a frequency overlay scheme (hereinafter referred to as a “frequency overlay communication system”).

  With the development of communication systems, the types of services provided are diversified, and there is a need for research and development regarding broadband communication systems for providing these various types of services through broadband. Frequency resources in a broadband communication system are limited. The usable frequency band is limited, and it is necessary to consider backward compatibility with an already installed communication system. Therefore, the broadband communication system is difficult to design.

  Existing broadband communication systems are designed under the assumption that different frequency bands are allocated to provide various types of broadband services. As communication technology develops, an increase in the number of frequency bands for broadband services is required, and the license fee for the use of frequency bands also increases, thereby increasing the variety of proposed broadband services. A delay occurs in the method.

  Therefore, there is a need for a scheme for smoothly providing broadband services while overcoming the limitations of frequency bands or preventing an increase in license fees for frequency bands. One of these schemes is a wideband communication system overlaid with an existing communication system in a specific frequency band, such as a Code Division Multiple Access (CDMA) 2000 3x communication system and overlay orthogonal frequency division multiple access. (Orthogonal Frequency Division Multiple Access :: OFDMA) communication systems are considered. In such a case, for transmission / reception of a paging message transmitted / received between a terminal (Mobile Station: MS) of a broadband communication system overlaid with a specific frequency band and each base station (Base Station: BS). Need new definitions.

  Accordingly, in order to solve the above-described problems of the prior art, an object of the present invention is to provide a method and apparatus for transmitting and receiving a paging message in a wireless communication system.

  It is another object of the present invention to provide a method and apparatus for transmitting a paging message according to a band supported by a terminal (MS).

  Another object of the present invention is to provide a method and apparatus for determining a paging carrier based on band information for a band supported by a terminal.

  In order to achieve the above object, according to one aspect of the present invention, there is provided a method for transmitting a paging message by a base station (BS) in a wireless communication system, wherein paging group information for a paging group to which the base station belongs. And a paging group identification information (PGID_Info) message including at least one of paging carriers included in each of a plurality of frequency bands operated by the base station, and transmitting to each terminal in idle mode. Determining a paging carrier for transmitting a paging message among paging carriers included in a frequency band supported by the terminal, and transmitting the paging message to the terminal using the determined paging carrier. And a step.

  According to another aspect of the present invention, a method for receiving a paging message by a terminal (MS) in a wireless communication system, wherein the paging group information for a paging group to which the base station belongs and is operated by the base station in an idle mode. Receiving from a base station (BS) a paging group identification information (PGID_Info) message including paging carrier information for each frequency band indicating at least one of paging carriers included in each of a plurality of frequency bands Determining a paging carrier for receiving a paging message among paging carriers included in a frequency band supported by the base station, and receiving a paging message from the base station using the determined paging carrier. .

  Further, according to another aspect of the present invention, a base station (BS) that transmits a paging message in a wireless communication system, the paging group information for a paging group to which the base station belongs, and a plurality of base stations operated by the base station A paging carrier included in a frequency band supported by the terminal by generating a paging group identification information (PGID_Info) message including paging carrier information for each frequency band indicating at least one of the paging carriers included in each frequency band A controller for determining a paging carrier for transmitting a paging message, and a transceiver for transmitting a PGID_Info message to the terminal in the idle mode and transmitting the paging message using the determined paging carrier.

  Further, according to another aspect of the present invention, a terminal (MS) that receives a paging message in a wireless communication system, and receives and transmits a paging group identification information (PGID_Info) message and a paging message from a base station (BS). And paging by frequency band indicating the paging group information for the paging group to which the base station belongs, and at least one paging carrier included in each of a plurality of frequency bands operated by the base station, from the PGID_Info message received in the idle mode Obtain carrier information, determine a paging carrier for receiving a paging message among paging carriers included in a frequency band supported by the terminal, and monitor the determined paging carrier And a controller for controlling the urchin transceiver.

  Other aspects, advantages, and salient features of the present invention can be more easily understood with reference to the following detailed description when considered in conjunction with the accompanying drawings. It is clear to those who have.

  The present invention can prevent overhead caused by using a band class that is not supported by a terminal, and can effectively distribute inter-carrier paging load in a base station. Further, the present invention can reduce unnecessary paging message overhead by reducing paging message overhead due to paging carrier operation and ensuring reception of paging messages in a band supported by the terminal.

  The above and other aspects, features and advantages of embodiments according to the present invention will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings.

FIG. 3 is a diagram schematically illustrating a band and carrier allocation configuration in a frequency overlay communication system according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a message flow for explaining an operation of selecting a paging carrier by a terminal in a frequency overlay communication system according to an embodiment of the present invention. FIG. 6 is a message flow diagram illustrating an operation of transmitting band information to a terminal in an idle mode (IM) entry procedure according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a message flow for explaining an operation of transmitting a paging announcement message for a terminal in a paging listening period according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a message flow for explaining an operation of selecting a paging carrier by a terminal and receiving a paging message in a paging listening period according to an embodiment of the present invention. 5 is a flowchart illustrating an operation of transmitting a paging message using band information of a terminal by a base station according to an embodiment of the present invention. 5 is a flowchart illustrating an operation of transmitting a paging message using band information of a terminal by a base station according to an embodiment of the present invention. 1 is a block configuration diagram schematically showing a configuration of a base station according to an embodiment of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the embodiments of the present invention as defined in the appended claims and their equivalents, It includes various specific details to aid in this understanding, but is only one embodiment. Accordingly, it will be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, from the viewpoints of clarity and conciseness, detailed descriptions of functions and configurations well known to those skilled in the art are omitted.

  The terms and words used in the following description and claims are not limited to the dictionary meaning, but are used by the inventor to make the understanding of the present invention clear and consistent. Accordingly, it is to be defined based on the following claims and their equivalents, and the description of the embodiments of the present invention is merely provided for illustrative purposes and is intended to limit the purpose of the present invention. It will be clear to those of ordinary skill in the art of the present invention.

  Those skilled in the art will appreciate that “a”, “an”, and “the”, ie, the singular forms in the English specification, include the plural unless the context clearly indicates otherwise. Thus, for example, reference to “a component surface” includes one or more surfaces.

  The term “substantially” does not require that the presented feature, parameter, or value be precisely set, but is known to allow tolerances, measurement errors, measurement accuracy limits and those skilled in the art, Alternatively, it means that deviations or changes including elements obtained by those skilled in the art without experimentation occur within a range that does not exclude the effect that these characteristics are intended to provide.

  Here, a paging transmission / reception operation of a wireless communication system will be described with reference to a communication standard based on IEEE (Institute of Electrical and Electronics Engineers) 802.16e and 802.16m, which is proposed by the embodiment of the present invention. The paging operation is not limited to a specific communication protocol or system configuration, and various modifications can be made without departing from the gist of the present invention. it is obvious.

  The various embodiments used to explain the principles of the present invention shown in FIGS. 1 to 7 described below are merely illustrative of the embodiments and are considered to limit the scope of the present invention. Must not. It will be apparent to those skilled in the art that the principles of the present invention can be implemented in a properly arranged communication system. The terms used in describing various embodiments are exemplary. It should be understood, however, that this is provided for purposes of understanding the description, and that their use and definitions do not limit the scope of the invention. Terms such as “first” and “second” are used to distinguish between objects having the same term, but do not imply an order between objects, unless explicitly stated. Set means a non-empty set containing at least one element.

  FIG. 1 schematically illustrates a band and carrier allocation configuration in a frequency overlay communication system according to an embodiment of the present invention.

  Referring to FIG. 1, the frequency overlay communication system is operated in two frequency bands (hereinafter referred to as 'bands'), that is, band A100 and band B103. As an example, band A100 may have a center frequency of 2.5 GHz, and band B103 may have a center frequency of 3.5 GHz. The communication system includes a first base station (BS) 111 and a second base station 151. The first base station 111 includes carriers C1 113, C2 115, C3117 belonging to the band A100, and a carrier C4 belonging to the band B103. 119, C5 121, C6 123, and C7 125 are operated. The second base station 151 includes carriers C1 153, C2 155 and C3 157 belonging to the band A100 and carriers C4 159, C5 161, C6 163 and C7 165 belonging to the band B 103.

  Each base station operates a predetermined partial carrier as a paging carrier in order to reduce a burden that an idle mode terminal (MS) must monitor all carriers in order to receive a paging message. In the above example, the first base station 111 uses carriers C1 113, C3 117, C4 119, C5 121, and C6 123 as paging carriers, and the second base station 151 includes carriers C1 153, C3 157, C4 159 and C7 165 are used as paging carriers. When receiving a paging request from the higher system, the first base station 111 or the second base station 151 transmits a paging message using a paging carrier. These paging carriers were introduced to prevent duplicate paging messages from being transmitted on all carriers of the base station. Among the paging carriers, the paging carrier used by the terminal for receiving the paging message is selected from the paging carriers based on a predetermined specific calculation.

  FIG. 2 shows a message flow for explaining an operation of selecting a paging carrier by a terminal in a frequency overlay communication system according to an embodiment of the present invention.

  Referring to FIG. 2, the terminal 201 is in an idle mode, and the base station 251 has two bands, that is, a band A including carriers C1, C2, and C3 and a band including carriers C4, C5, C6, and C7. B and C1, C3, C4, C5, and C6 are used as paging carriers.

  In step 211, the base station 251 receives a paging control message for advertising a paging group supported by the base station 251 at a predetermined position within a paging listening interval according to a paging cycle, that is, paging group identification information ( (Paging Group IDentification Information: PGID_Info) message is transmitted to the terminal in the idle mode. The PGID_Info message can be transmitted through all carriers configured in the base station 251, all paging carriers, or a carrier indicated by the higher system. The PGID_Info message includes information on at least one paging carrier operated by the base station, that is, paging carrier information. For example, the PGID_Info message includes the number of paging group identifiers (PGID) included in the PGID_Info message, the PGID of the paging group to which the base station transmitting the PGID_Info message belongs, and each carrier in the base station is a paging carrier. A paging carrier instruction bitmap indicating whether or not. The paging carrier instruction bitmap has the same size as the number of carriers that can be operated in the base station, and the bits in the bitmap are mapped to carriers that can be operated on a one-to-one basis. The number of paging carriers is the same as the number of bits set to ‘1’ in the bitmap.

  In step 213, the terminal 201 in the idle mode acquires the paging carrier information of the base station 251 for identifying the paging carrier used for receiving the paging advertisement (PAG-ADV) message from the PGID_Info message. . The paging carrier information includes, for example, a paging carrier indication bitmap that indicates at least one carrier used as a paging carrier among the carriers of the base station 251. In the above example, the paging carrier information indicates C1, C3, C4, C5, and C6 among the carriers C1 to C7.

  In step 215, the terminal 201 determines a paging carrier to be monitored to receive a paging message in the paging listening period according to a predetermined arithmetic expression. For example, the arithmetic expression used to determine the paging carrier is as shown in the following mathematical expression (1).

  Here, DID (Deregistration Identifier) represents a deregistration identifier uniquely assigned to identify a terminal in the idle mode, N represents the number of paging carriers operated by the base station, and 'mod' represents a modulo operation. Represents. The DID is assigned to the terminal when the terminal enters the idle mode, that is, when the terminal is deregistration, and N is obtained from the paging carrier information of the PGID_Info message.

  For example, when the DID of the terminal 201 is “237”, the number of paging carriers operated by the base station 251 is 5, so the paging carrier of the terminal 201 is determined as C4.

  In step 217, the terminal 201 receives a paging message for paging the terminal 201, that is, a PAG-ADV message, using the determined paging carrier C4. For example, the PAG-ADV message is transmitted by an IEEE 802.16m-based advanced air interface (AAI). The PAG-ADV message includes paged terminal information (Paged MS Info) indicating whether or not each terminal of the corresponding paging group has been paged. For example, the paged terminal information includes a DID and an operation code, and indicates whether the terminal performs network reentry or ranging for location update using the operation code. .

  As described above, since the PAG-ADV message is transmitted through only one carrier unlike the PGID_Info message, the MS 201 selects one of all paging carriers operated by the base station 251. Monitor.

  On the other hand, if base station 251 operates band A and band B having different band characteristics, and terminal 201 supports only one of these bands (for example, band A) instead of supporting both band A and band B, Assuming that C4 is selected by an arithmetic expression, the terminal 201 cannot perform a transmission / reception operation at C4. Therefore, the terminal 201 cannot receive a paging message for itself. In this case, the terminal 201 must perform a location update procedure in the base station 251 and notify the base station 251 and its higher system, that is, the paging control station, of the paging carrier desired by the terminal 201. This is determined by performing a location update procedure of the base station 251. Thereafter, the paging message for the terminal 201 is transmitted through a desired paging carrier.

  As described above, when the band accessible by the terminal is limited, overhead for performing the location update procedure can be generated. Accordingly, in the situation where there are a plurality of bands and a plurality of carriers as in the allocation configuration of FIG. 1, there arises a problem that the paging overhead is not properly distributed.

  In order to solve such a problem, in an embodiment described later, the paging carrier is determined based on band information regarding a band supported by the terminal. The band information of the terminal is stored and managed by the paging control station when the terminal enters the idle mode. The idle mode (IM) entry procedure may be performed in a terminal initiated (MS-initiated) or base station initiated (BS-initiated) manner.

  FIG. 3 shows a message flow for explaining an operation of transmitting terminal band information in an idle mode entry procedure according to an embodiment of the present invention.

  Referring to FIG. 3, the terminal 301 supports band A operated by the base station 331. In step 311, the terminal 301 transmits a deregistration request (DREG-REQ) message for IM entry to the base station 331 after completing data transmission / reception through C 1 among the carriers of the base station 331. In step 313, the base station 331 transmits a state change request (State Change REQ) message for requesting the terminal 301 to enter the IM to the paging control station 341. This state change request message includes information regarding the band supported by the terminal 301. In the above example, the band information indicates the band A in which the terminal 301 performs IM entry. In another example, the state change request message can include information regarding all bands supported by the terminal 301. For example, when the terminal 301 supports the band C in addition to the band A, information regarding the band A and the band C can be included in the state change request message.

  In step 315, the paging control station 341 transmits a state change response (State Change RSP) message to the base station 331 in response to the state change request message. The state change response message may include band information of the terminal 301 transmitted through the state change request message.

  In step 317, the base station 331 transmits a deregistration response (DREG-RSP) message to the terminal 301 to notify the completion of the IM entry procedure. In step 319, the terminal 301 transitions to the idle mode according to the DREG-RSP message. Thereafter, in step 321, the first base station 331 transmits a state change confirmation (State Change ACK) message to the paging control station 341. In step 323, the paging control station 341 manages paging information and band information of the terminal 301. The paging information can include, for example, a paging cycle, a paging offset, a DID, a paging group, context information, and the like. The band information is stored in the paging control station 341 for use when the terminal 301 is paging.

  Although the terminal-initiated IM entry procedure has been described with reference to FIG. 3, the base station-initiated IM entry procedure can be performed in a similar manner. In the base station initiated IM entry procedure, band information is exchanged between the base station and the paging control station. In other words, the base station exchanges band information indicating bands supported by the terminal together with the paging control station before transmitting the DREG-RSP message for IM entry to the terminal.

  FIG. 4 illustrates a message flow for explaining an operation of transmitting a paging announcement message for a terminal in a paging listening period according to an embodiment of the present invention.

  Referring to FIG. 4, terminal 401 supports band A operated by first base station 431 and third base station 435, and second base station 433 operates a band other than band A. In steps 411, 413, and 415, the paging control station 441 sends a first paging message 431 managed by the paging control station 441 to inform the terminal 401 to transmit the PAG-ADV message in the idle mode. The data is transmitted to the second base station 433 and the third base station 435. The paging notification message includes band information for a band in which the PAG-ADV message is transmitted. The band information included in the paging notification message is the same as the band information managed by the paging control station 441 for the terminal 401. For example, the band information can be stored in the paging control station 441 by the procedure shown in FIG.

  When the paging control station 441 receives a paging request to the terminal 401, the paging control station 441 searches for the band information stored in the terminal 401, generates a paging public message including the searched band information, and sends the generated paging public message to itself. To the base station belonging to the paging group managed by the paging control station 441. When the band information stored for the terminal 401 does not exist, the paging control station 441 requests the other paging control station storing the band information for the terminal 401 to provide the band information. To win.

  Each of the first base station 431, the second base station 433, and the third base station 435 determines the PGID_Info based on the information on the terminal 401 indicated by the paging notification message and the information on the band supported by the terminal 401, respectively. Message and PAG-ADV message are generated. That is, each base station 431, 433, 435 selects a band supported by the terminal 401 from at least one band operated by itself, and is used as a paging carrier from among the carriers belonging to the selected band. Select a carrier. In steps 417, 419, and 421, PGID_Info messages including the paging group information of base stations 431, 433, and 435 and paging carrier information for each band are transmitted from base stations 431, 433, and 435 to terminal 401, respectively. As an example, the paging carrier information for each band includes the number of bands operated by the base station, the number of carriers of each band operated by the base station, and a bitmap Bitmap_Band indicating the paging carrier among the carriers in each band. Can be included. Therefore, there are as many bitmaps as the number of bands to be operated. The size or length of the specific bitmap is the same as the number of carriers in the related band, and the bit set to '1' represents a paging carrier among the carriers in the corresponding band.

  Since the band operated by the first base station 431 and the third base station 435 is supported, the terminal 401 receives the PGID_Info message transmitted from the first base station 431 or the third base station 435. Can do. In another embodiment, the second base station 433 confirms from the band information that the terminal 401 does not support the band operated by the second base station 433, and does not transmit the PGID_Info message and the PAG-ADV message. Can be determined.

  After the PGID_Info message is transmitted, the first base station 431, the second base station 433, and the third base station 435 transmit the PAG-ADV message on the selected paging carrier in steps 423, 425, and 427, respectively. To transmit. The PAG-ADV message includes only information on the terminal 401 that has been determined to receive the PAG-ADV message on the selected corresponding paging carrier. Since the terminal 401 supports the band operated by the first base station 431 and the third base station 435, the PAG-ADV is selected by the paging carrier selected by the first base station 431 or the third base station 435. A message can be received.

  FIG. 5 shows a message flow illustrating an operation of receiving a paging message by selecting a paging carrier by a terminal in a paging listening period according to an embodiment of the present invention.

  Referring to FIG. 5, base station 531 operates two bands, that is, band A and band B. Band A includes carriers C1, C2, C3, and band B includes carriers C4, C5, C6. Includes C7. Band A carriers C1 and C3 are used as band A paging carriers, and band B carriers C4, C5 and C6 are used as band B paging carriers.

  In step 511, the paging control station 541 transmits to the base station 531 a paging notification message that instructs the terminal 501 to transmit a PAG-ADV message. As described above, the paging notification message includes a band index indicating a band (for example, band A) supported by the terminal 501.

  In step 513, the base station 531 recognizes the paging known message that the terminal 501 supports the band A, and determines the paging carrier of the terminal 501 by a predetermined arithmetic expression. For example, an arithmetic expression used to determine the paging carrier is as shown in the following mathematical expression (2).

  Here, DID represents an identifier uniquely assigned to identify an idle mode terminal, and N_Band represents the number of paging carriers in the corresponding band. The terminal 501 can recognize N_Band from the paging carrier information for each band supported by the terminal 501. For example, when the DID of the terminal 501 is ‘237’, the number of paging carriers in the band A supported by the terminal 501 is 2, so the paging carrier of the terminal 501 is determined as C3.

  In step 515, the base station 531 transmits a PGID_Info message to the terminal 501. The PGID_Info message includes paging group information of the base station 531 and band-specific paging carrier information. For example, the band-specific paging carrier information includes a bitmap “101” for band A and a bitmap “1110” for band B. The terminal 501 can receive the PGID_Info message through an arbitrary carrier, that is, C1.

  In step 517, the terminal 501 obtains information on the paging carriers C1 and C3 operated by the base station 531 in the band A supported by the terminal 501 from the paging carrier information by band of the PGID_Info message. In step 519, the terminal 501 determines the paging carrier C3 used to receive the paging message using the same arithmetic expression as that used in the base station 531, for example, the mathematical expression (2). Paging carrier C3 is monitored. In step 521, the terminal 501 receives the PAG-ADV message transmitted by the base station 531 on the paging carrier C3.

  6A and 6B are flowcharts illustrating an operation of transmitting a paging message using band information of a terminal by a base station according to an embodiment of the present invention.

  Referring to FIGS. 6A and 6B, the base station performs a network entry procedure with the terminal in step 601, and obtains band information for a band supported by the terminal in step 603. In step 605, the base station performs data transmission / reception with the terminal. In step 607, the base station determines whether the terminal performs an IM entry procedure for transitioning to the idle mode. The IM entry procedure includes a process in which a terminal and a base station exchange DREG-REQ messages and DREG-RSP messages. If it is determined in step 607 that the terminal performs the IM entry procedure, the base station transmits the paging information and band information of the terminal to the paging control station in step 609. Paging information and band information are transmitted in a state change request / response / confirmation message exchanged between the base station and the paging control station. After the terminal is deregistered, in step 611, the base station performs general base station operations such as performing data transmission / reception with other terminals in the active mode.

  While performing general base station operations, the base station determines whether a paging notification message is received from the paging control station in step 613. The paging instruction message includes paging information and band information of a terminal to which the base station transmits the paging message. In step 607, the terminal that transmits the paging message may be the same terminal as the terminal that performed the IM entry procedure, or a different terminal from the above terminal.

  If it is determined in step 613 that a paging notification message is received, the base station acquires terminal band information from the paging notification message in step 615. Therefore, even if the terminal instructed to perform paging does not perform the IM entry procedure in the base station, the base station can receive the band information of the terminal from the paging control station. In step 617, the base station determines whether the terminal supports a band operated by the base station. If it is determined in step 617 that the terminal supports a band operated by the base station, the base station determines at least one paging carrier used in the band in step 619 and uses a predetermined arithmetic expression. A paging carrier to be monitored by the terminal for receiving a paging message is determined. In step 621, the base station transmits paging carrier information for each band indicating at least one paging carrier determined for the band to the terminal using a paging control message. In step 623, the base station transmits a paging message for the terminal through the paging carrier determined for the terminal.

  The operation according to the above-described embodiment of the present invention can be realized by attaching a memory device storing the corresponding program code to each of the base station and the terminal. In other words, each of the base station and the terminal reads and executes the program code stored in the memory device by a controller including a processor or a CPU (Central Processing Unit), and transmits and receives necessary information to and from each other through the transceiver. Thus, the described operation is performed.

  Specifically, the base station generates a paging control message and a paging message to analyze the paging known message (including a processor or a CPU), and transmits the paging control message and the paging message under the control of the controller. And at least one band transceiver. Similarly, the terminal receives the paging control message and the paging message under the control of the controller (including the processor or CPU) that analyzes the paging control message and the paging message to confirm whether the terminal has been paged or not. And at least one band transceiver.

  FIG. 7 is a block diagram schematically illustrating a base station according to an embodiment of the present invention.

  Referring to FIG. 7, the controller 701 receives a paging notification message from the host system or the paging control station 707, acquires terminal information and band information included in the paging notification message, and stores them in the memory 703. The controller 701 generates a terminal paging control message and a paging message based on the terminal information and the band information. Based on the band information, the controller 701 determines a paging carrier for transmitting the terminal's paging message in a band supported by the terminal. The paging control message is transmitted through a base station band transceiver, for example, a band A transceiver 705 and a band B transceiver 709. The paging message is transmitted through the paging carrier of the terminal selected by the controller 701 after the paging control message is transmitted.

  Although the present invention has been described in connection with specific embodiments, the present invention has been described in detail without departing from the scope and spirit of the invention as defined by the appended claims and their equivalents. It will be apparent to those skilled in the art that various changes in the details can be made.

100 Band A
103 Band B
111 First base station 151 Second base station 701 Controller 703 Memory 705 Band A transceiver 707 Paging controller 709 Band B transceiver

Claims (24)

  A method in which a base station in a wireless communication system transmits a paging message, comprising:
  Determining a paging carrier for transmitting a paging message out of paging carriers in the first frequency band and the second frequency band based on the paging information message;
  Transmitting the paging information message using the determined paging carrier,
  The paging information transmission method, wherein the paging information message includes information on a paging group identifier to which the base station belongs and information on the paging carrier.   2. The paging message transmission method according to claim 1, wherein the paging information message is transmitted to an idle mode mobile terminal and includes information indicating the number of paging group identifiers included in the paging information message.   The step of determining the paging carrier includes
  The paging message transmission method according to claim 1, further comprising the step of determining the paging carrier by performing a modulo operation on the number of the paging carriers.   The method of claim 1, wherein the paging carrier is included in the same frequency band as a frequency band in which the paging message is transmitted.   The information on the paging carrier includes paging carrier indication bitmap information indicating whether the corresponding carrier is a paging carrier of the base station, and the paging carrier indication bitmap information indicates that the corresponding carrier transmits the paging message. The paging message transmission method according to claim 1, further comprising a paging carrier indication bit indicating whether or not to use.   When the paging carrier indication bit is a first value, the corresponding carrier is used to transmit the paging message, and when the paging carrier indication bit is a second value different from the first value, The method of claim 5, wherein the corresponding carrier is not used to transmit the paging message.   A method for a mobile terminal in a wireless communication system to receive a paging message,
  Determining a paging carrier for receiving a paging message out of paging carriers in the first frequency band and the second frequency band based on the paging information message;
  Receiving the paging message from a base station using the determined paging carrier;
  The paging information reception method, wherein the paging information message is received through the paging carrier and includes information on a paging group identifier to which the base station belongs and information on the paging carrier.   The method of claim 7, wherein the paging information message is received in an idle mode and includes information indicating the number of paging group identifiers included in the paging information message.   The step of determining the paging carrier includes
  The paging message receiving method according to claim 7, further comprising the step of determining the paging carrier by performing a modulo operation on the number of the paging carriers.   The method of claim 7, wherein the paging carrier is included in a frequency band that is the same as a frequency band in which the paging message is transmitted.   The information on the paging carrier includes paging carrier indication bitmap information indicating whether the corresponding carrier is a paging carrier of the base station, and the paging carrier indication bitmap information indicates that the corresponding carrier transmits the paging message. 8. The paging message receiving method according to claim 7, further comprising a paging carrier indication bit indicating whether or not to use it.   When the paging carrier indication bit is a first value, the corresponding carrier is used to transmit the paging message, and the paging carrier indication bit is a second value different from the first value. The method according to claim 11, wherein the corresponding carrier is not used for transmitting the paging message.   A base station in a wireless communication system,
  A control unit for determining a paging carrier for transmitting a paging message out of paging carriers in the first frequency band and the second frequency band based on the paging information message;
  A transmission unit for transmitting the paging information message using the determined paging carrier,
  The base station, wherein the paging information message includes information on a paging group identifier to which the base station belongs and information on the paging carrier.   The base station according to claim 13, wherein the paging information message is transmitted to an idle mode mobile terminal and includes information indicating the number of paging group identifiers included in the paging information message.   The base station according to claim 13, wherein the control unit determines the paging carrier by performing a modulo operation on an identifier of the mobile terminal to the number of the paging carriers.   The base station according to claim 13, wherein the paging carrier is included in the same frequency band as a frequency band in which the paging message is transmitted.   The information on the paging carrier includes paging carrier indication bitmap information indicating whether the corresponding carrier is a paging carrier of the base station, and the paging carrier indication bitmap information indicates that the corresponding carrier transmits the paging message. The base station as claimed in claim 13, further comprising a paging carrier indication bit indicating whether or not to use.   When the paging carrier indication bit is a first value, the corresponding carrier is used to transmit the paging message, and when the paging carrier indication bit is a second value different from the first value, The base station according to claim 17, wherein the corresponding carrier is not used to transmit the paging message.   A mobile terminal in a wireless communication system,
  A control unit for determining a paging carrier for receiving a paging message out of paging carriers in the first frequency band and the second frequency band based on the paging information message;
  A receiver that receives the paging message using the determined paging carrier,
  The paging information message is received through the paging carrier and includes information on a paging group identifier to which the base station belongs and information on the paging carrier.   The mobile terminal according to claim 19, wherein the paging information message includes information indicating the number of paging group identifiers received in the idle mode and included in the paging information message.   The mobile terminal according to claim 19, wherein the controller determines the paging carrier by performing a modulo operation on the number of the paging carriers.   The mobile terminal according to claim 19, wherein the paging carrier is included in the same frequency band as a frequency band in which the paging message is transmitted.   The information on the paging carrier includes paging carrier indication bitmap information indicating whether the corresponding carrier is a paging carrier of the base station, and the paging carrier indication bitmap information indicates that the corresponding carrier transmits the paging message. The mobile terminal according to claim 19, further comprising a paging carrier indication bit indicating whether or not to be used for the purpose.   When the paging carrier indication bit is a first value, the corresponding carrier is used to transmit the paging message, and when the paging carrier indication bit is a second value different from the first value, The mobile terminal according to claim 23, wherein the corresponding carrier is not used to transmit the paging message.