Abstract:
Provided is a method for configuring a wireless backhaul link by a Mobile Station (MS) in a wireless communication system. The method includes acquiring System Information (SI) for each of an old Base Station (BS) which transmits a first code and a new BS which transmits a second code. The method includes transmitting a message which reports the SI for the new BS to the old BS. The method includes receiving a message indicating that the new BS discards the second code and uses the first code from the old BS, wherein the first code is a code indicating that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY 
       [0001]    The present application is related to and claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed in the Korean Intellectual Property Office on Jul. 11, 2012 and assigned Serial No. 10-2012-0075330, the entire disclosure of which is hereby incorporated by reference. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to an apparatus and method for configuring a wireless back haul link in a wireless communication system. 
       BACKGROUND 
       [0003]    A wireless communication system has evolved to provide various high-speed large-capacity services to Mobile Stations (MSs). Examples of the wireless communication system include a High Speed Downlink Packet Access (HSDPA) mobile communication system, a High Speed Uplink Packet Access (HSUPA) mobile communication system, a Long-Term Evolution (LTE) mobile communication system, a LTE-Advanced (LTE-A) mobile communication system, a High Rate Packet Data (HRPD) mobile communication system proposed in a 3rd Generation Project Partnership 2 (3GPP2), and an Institute of Electrical and Electronics Engineers (IEEE) 802.16m mobile communication system. 
         [0004]    That is, the wireless communication system has evolved to increase data rate for satisfying a data traffic need, so the wireless communication system actively considers using a super high frequency-ultra wideband scheme in which a super high frequency is used at an ultra wide band in order to increase the data rate. However, the super high frequency-ultra wideband scheme increases propagation loss, the propagation loss results in decreasing a propagation distance, so a service coverage of a Base Station (BS) is decreased. 
         [0005]    Meanwhile, a beam forming scheme is a typical scheme in which the wireless communication system decreases propagation loss, so the wireless communication system uses the super high frequency-ultra wideband scheme and the beam forming scheme to increase a service coverage of a BS. Even if the wireless communication system uses the super high frequency-ultra wideband scheme and the beam forming scheme, data traffic increase in the wireless communication system results in an additional BS deployment. Recently, even if a service coverage is decreased according to the data traffic increase and system request, a need for a BS of which a size is small increases, so an additional BS deployment is resulted. 
         [0006]    If a BS is additionally deployed in a wireless communication system, a link between a new BS and an old BS should be configured, a method for configuring the link between the new BS and the old BS in the wireless communication system will be described with reference to  FIGS. 1 to 3 . 
         [0007]      FIG. 1  schematically illustrates a process for configuring a link between an old BS and a femto BS in a case that the femto BS is newly deployed as a new BS in a conventional wireless communication system. 
         [0008]    Referring to  FIG. 1 , the wireless communication system includes an old BS  110  and a femto BS  120 . If the femto BS  120  is newly deployed as a new BS in a situation in which the old BS  110  has been deployed in the wireless communication system, a Mobile Station (MS) may recognize that the femto BS  120  is newly deployed. After recomizing the newly deployed femto BS  120 , the MS notifies the old BS  110  that the femto BS  120  is deployed, so the old BS  110  may recognize that the femto BS  120  is newly deployed. 
         [0009]      FIG. 2  schematically illustrates a process for configuring a link between an old BS and a relay BS in a case that the relay BS is newly deployed as a new BS in a conventional wireless communication system. 
         [0010]    Referring to  FIG. 2 , the wireless communication system includes an old BS  210  and a relay BS  220 . If the relay BS  220  is newly deployed as a new BS in a situation in which the old BS  210  has been deployed in the wireless communication system, the relay BS  220  configures a link with the old BS  210  by performing an initial network entry procedure like an MS (not shown in  FIG. 2 ). 
         [0011]      FIG. 3  schematically illustrates a process for configuring a link between an old BS and a new BS in a case that the new BS is deployed in a conventional wireless communication system. 
         [0012]    Referring to  FIG. 3 , the wireless communication system includes an old BS  310  and a new BS  320 . If the new BS  320  is newly deployed in a situation in which the old BS  310  has been deployed, the wireless communication system configures a link between the old BS  310  and the new BS  320  by allocating a dedicated resource between the old BS  310  and the new BS  320 . That is, the old BS  310  performs a signaling using a dedicated resource for configuring a back haul link between the old BS  310  and the new BS  320  as well as a signaling provided through an air link. 
         [0013]    The link configuration method among BSs described in  FIGS. 1 to 3  has following problems. 
         [0014]    Firstly, in the link configuration method among BSs described in  FIG. 1 , if the femto BS  120  is newly deployed in a wireless communication system, there is a limitation in which the femto BS  120  should be connected to the old BS  110  through a wired back haul link. 
         [0015]    Secondly, in the link configuration method among BSs described in  FIG. 2 , the relay BS  220  should be deployed within a service coverage of the old BS  210 . So, a link coverage between the old BS  210  and the relay BS  220  may not exceed a link coverage between the old BS  210  and an MS. 
         [0016]    Thirdly, in the link configuration method among BSs described in  FIG. 3 , a signaling should be always performed for configuring a back haul link among BSs using a dedicated resource, so severe waste for power, frequencies, etc. is resulted and a service quality is severely decreased. 
         [0017]    The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. 
       SUMMARY 
       [0018]    To address the above-discussed deficiencies of the prior art, an aspect of the present invention is to provide an apparatus and method for configuring a wireless back haul link in a wireless communication system. 
         [0019]    Another aspect of the present disclosure is to provide an apparatus and method for configuring a wireless back haul link in a reaction in which a wired back haul link may not be provided in a wireless communication system. 
         [0020]    Another aspect of the present disclosure is to provide an apparatus and method for configuring a wireless back haul link without limiting link coverage among Base Stations (BSs) in a wireless communication system. 
         [0021]    Another aspect of the present disclosure is to provide an apparatus and method for configuring a wireless back haul link using a dedicated resource as necessary in a wireless communication system. 
         [0022]    In accordance with an aspect of the present disclosure, there is provided a method for configuring a wireless backhaul link by a Mobile Station (MS) in a wireless communication system, the method comprising: acquiring System Information (SI) for each of an old Base Station (BS) which transmits a first code and a new BS which transmits a second code; transmitting a message which reports the SI for the new BS to the old BS; and receiving a message indicating that the new BS discards the second code and uses the first code from the old BS, wherein the first code is a code indicating, that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed. 
         [0023]    In accordance with another aspect of the present disclosure, there is provided a method for configuring a wireless backhaul link by an old Base Station (BS) in a wireless communication system, the method comprising: receiving System Information (SI) for a new BS which transmits a second code from a Mobile Station (MS); performing a Front-Haul Link Configuration Procedure (FLCP) with the new BS; transmitting a first code to the new BS after completing the FLCP; and transmitting a message indicating that the new BS discards the second code and uses the first code, wherein the first code is a code indicating that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed. 
         [0024]    In accordance with another aspect of the present disclosure, there is provided a method for configuring a wireless backhaul link by a new Base Station (BS) in a wireless communication system, the method comprising: performing a Front-Haul Link Configuration Procedure (FLCP) with an old BS; after completing the FLCP with the old BS, receiving a first code from the old BS; and discarding a second code which the new BS has already used and using the first code, wherein the first code is a code indicating that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed. 
         [0025]    In accordance with another aspect of the present disclosure, there is provided a Mobile Station (MS) in a wireless communication system, the MS comprising: a transmitter; a receiver; and a controller, wherein the controller is configured to acquire System Information (SI) for each of an old Base Station (BS) which transmits a first code and a new BS which transmits a second code, wherein the transmitter is configured to transmit a message which reports the SI for the new BS to the old BS, wherein the receiver is configured to receive a message indicating that the new BS discards the second code and uses the first code from the old BS, wherein the first code is a code indicating that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed. 
         [0026]    In accordance with another aspect of the present disclosure, there is provided an old Base Station (BS) in a wireless communication system, the old BS comprising: a receiver; a transmitter; and a controller, wherein the receiver is configured to receive System Information (SI) for a new BS which transmits a second code from a Mobile Station (MS), wherein the controller is configured to perform a Front-Haul Link Configuration Procedure (FLCP) with the new BS, wherein the transmitter is configured to transmit a first code to the new BS after completing the FLCP, and transmits a message indicating, that the new BS discards the second code and uses the first code, wherein the first code is a code indicating that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed. 
         [0027]    In accordance with another aspect of the present disclosure, there is provided a new Base Station (BS) in a wireless communication system, the new BS comprising: a transmitter; a receiver; and a controller, wherein the controller is configured to perform a Front-Haul Link Configuration Procedure (FLCP) with an old BS, wherein the receiver is configured to receive a first code from the old BS after the FLCP with the old BS is completed, wherein the controller is configured to discard a second code which the new BS has already used and uses the first code, wherein the first code is a code indicating that a related BS is a BS which has been already deployed, and wherein the second code is a code indicating that a related BS is a BS which is newly deployed. 
         [0028]    Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses certain embodiments of the disclosure. 
         [0029]    Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0030]    For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
           [0031]      FIG. 1  schematically illustrates a process for configuring a link between an old BS and a femto BS in a case that the femto BS is newly deployed as a new BS in a conventional wireless communication system; 
           [0032]      FIG. 2  schematically illustrates a process for configuring a link between an old BS and a relay BS in a case that the relay BS is newly deployed as a new BS in a conventional wireless communication system; 
           [0033]      FIG. 3  schematically illustrates a process for configuring a link between an old BS and a new BS in a case that the new BS is deployed in a conventional wireless communication system; 
           [0034]      FIGS. 4A to 4D  schematically illustrate a process for configuring a wireless back haul link between an old BS and a new BS in a case that the new BS is newly deployed in a wireless communication system according to embodiments of the present disclosure; 
           [0035]      FIG. 5  schematically illustrates a process for configuring a wireless back haul link between an old BS and a new BS illustrated in  FIGS. 4A to 4D ; 
           [0036]      FIG. 6  schematically illustrates an operation process of an MS  430  illustrated in  FIG. 5 ; 
           [0037]      FIG. 7  schematically illustrates an operation process of a BS # 1   410  illustrated in  FIG. 5 ; 
           [0038]      FIG. 8  schematically illustrates an operation process of a BS # 2   420  illustrated in  FIG. 5 ; 
           [0039]      FIG. 9  schematically illustrates an internal structure of an MS in a wireless communication system according to embodiments of the present disclosure; 
           [0040]      FIG. 10  schematically illustrates an internal structure of an old BS in a wireless communication system according to embodiments of the present disclosure; and 
           [0041]      FIG. 11  schematically illustrates an internal structure of a new BS in a wireless communication system according to embodiments of the present disclosure. 
       
    
    
       [0042]    Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures. 
       DETAILED DESCRIPTION 
       [0043]      FIGS. 1 through 11 , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged BS or MS. 
         [0044]    The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of certain embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as examples. Accordingly, those of ordinary skilled in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
         [0045]    The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of certain embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limitingthe disclosure as defined by the appended claims and their equivalents. 
         [0046]    It is to be understood that the singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
         [0047]    The present disclosure provides an apparatus and method for configuring a wireless back haul link in a wireless communication system. 
         [0048]    The present disclosure provides an apparatus and method for configuring a wireless back haul link in a region in which a wired back haul link may not be provided in a wireless communication system. 
         [0049]    The present disclosure provides an apparatus and method for configuring a wireless back haul link without limiting link coverage among Base Stations (BSs) in a wireless communication system. 
         [0050]    The present disclosure provides an apparatus and method for configuring a wireless back haul link using a dedicated resource as necessary in a wireless communication system. 
         [0051]    An apparatus and method for configuring a wireless back haul link provided in the present disclosure may be applied to various mobile communication systems such as a High Speed Downlink Packet Access (HSDPA) mobile communication system, a High Speed Uplink Packet Access (HSUPA) mobile communication system, a Long-Term Evolution (LTE) mobile communication system, a LTE-Advanced (LTE-A) mobile communication system, a High Rate Packet Data (HRPD) mobile communication system proposed in a 3rd Generation Project Partnership 2 (3GPP2), and an Institute of Electrical and Electronics Engineers (IEEE) 802.16m mobile communication system. 
         [0052]      FIGS. 4A to 4D  schematically illustrate a process for configuring a wireless back haul link between an old BS and a new BS in a case that the new BS is newly deployed in a wireless communication system according to embodiments of the present disclosure. 
         [0053]    Referring to  FIGS. 4A to 4D , the wireless communication system includes a BS # 1   410 , a BS # 2   420 , and a Mobile Station (MS)  430 . 
         [0054]    The MS  430  performs a scan operation for neighbor BSs. Upon detecting a preset Temporary code (Tcode), the MS  430  receives System Information (SI) from a BS which transmits the Tcode and stores the received SI (step  411 ). The Tcode is transmitted from only a newly deployed BS not a BS which has already benn deployed. The MS  430  does not perform a random access operation with the BS which transmits the Tcode. 
         [0055]    For example, it will be assumed that the SI includes location associated information of a related BS, and the location associated information includes a latitude, a longitude, an altitude, etc. In  FIGS. 4A to 4D , the BS # 1   410  is an old BS, the BS # 2   420  is a new BS that is newly deployed, and the MS  430  maintains a connection with the BS # 1   410 . The MS  430  transmits a new BS information report message including the SI received from the BS # 2   420  to the BS # 1   410  (step  413 ). 
         [0056]    After receiving the new BS information report message from the MS  430 , the BS # 1   410  detects that there is the new BS using the Tcode around the BS # 1   410 , so the BS # 1   410  should perform a Front-Haul Link Configuration Procedure (FLCP) with the new BS, e.g., the BS # 2   420 . The BS # 1   410  starts the FLCP with the BS # 2   420 . The BS # 1   410  transmits an FLCP start code transmission request message requesting to transmit an FLCP start request code indicating an FLCP start command to the BS # 2   420  (step  415 ). The BS # 1   410  may transmit the FLCP start code transmission request message to only the MS  430 , and the number of MSs which transmit the FLCP start code transmission request message is determined without limitation according to a need of the BS # 1   410 . After receiving the FLCP start code transmission request message, the MS  430  transmits the FLCP start code to the BS # 2   420  in order that the BS # 2   420  starts performing the FLCP with the BS # 1   410  (step  417 ). 
         [0057]    Steps  415  to  417  may be omitted, and the BS # 1   410  immediately starts performing the FLCP with the BS # 2   420  if the steps  415  to  417  are omitted. 
         [0058]    The BS # 1   410  and the BS # 2   420  perform an FLCP during a preset time at a preset timing point (step  419 ). The FLCP may include a procedure in which the BS # 1   410  transmits a reference symbol for a front haul link to the BS # 2   420  and receives the reference symbol from the BS # 2   420 . 
         [0059]    After completing the FLCP, the BS # 2   420  configures a wireless back haul with the BS # 1   410 , updates a system operating parameter used for an air link, discards a Tcode which the BS # 2   420  has used, and uses a code for a normal air operation, i.e., a Normal code (Ncode) (step  421 ). If the BS # 2   420  uses the Ncode, the MS  430  may perform a normal operation with the BS  2  # 420  according to a need of the BS # 2   420  (step  423 ). 
         [0060]      FIG. 5  schematically illustrates a process for configuring a wireless back haul link between an old BS and a new BS illustrated in  FIGS. 4A to 4D . 
         [0061]    Referring to  FIG. 5 , a wireless communication system includes a BS # 1   410 , a BS # 2   420 , and an MS  430 . The MS  430  performs a scan operation for neighbor BSs (step  511 ). The BS # 1   410  transmits an Ncode (step  513 ). The BS # 2   420  is newly deployed and powered on (step  515 ) and transmits a Tcode (step  517 ). The MS  430  detects an Ncode and a Tcode after performing the scan operation for the neighbor BSs (step  519 ) and SI for BSs which transmit the Ncode and the Tcode (step  521 ). The MS  430  detects SI for the BS # 1   410  which transmits the Ncode and SI for the BS # 2   420  which transmits the Tcode. 
         [0062]    The MS  430  transmits a random access code to the BS # 1   410  through a random access channel (RACH) (step  523 ), and performs a network entry procedure with the BS # 1   410  (step  525 ). After performing the network entry procedure with the BS # 1   410 , the MS  430  transmits a new BS information report message to the BS # 1   410  (step  527 ). In  FIG. 5 , after performing the network entry procedure, the MS  430  transmits the new BS information report message to the BS # 1   410 , however, it will be understood by those of ordinary skill in the art that the new BS information report message may be transmitted to the BS # 1   410  during the network entry procedure. 
         [0063]    After receiving the new BS information report message from the MS  430 , the BS # 1   410  detects that there is a new BS which is newly deployed around the BS # 1   410 , so the BS # 1   410  determines to perform an FLCP with the new BS, i.e., the BS # 2   420  (step  529 ). After determining to perform the FLCP with the BS # 2   420 , the BS # 1   410  transmits an FLCP start code transmission request message to the MS  430  and MSs which are connected to the BS # 1   410  (step  531 ). After receiving the FLCP start code transmission request message, the MS  430  transmits an FLCP start code to the BS # 2   420  (step  533 ). 
         [0064]    Steps  531  to  533  may be omitted, and the BS # 1   410  immediately starts performing the FLCP with the BS # 2   420  if the steps  531  to  533  are omitted. 
         [0065]    The BS # 1   410  and the BS # 2   420  perform an FLCP during a preset time at a preset timing point (step  535 ). The FLCP may include a procedure in which the BS # 1   410  transmits a reference symbol for a front haul link to the BS # 2   420  and receives the reference symbol from the BS # 2   420 . 
         [0066]    After the FLCP is completed, a wireless back haul link is configured between the BS # 1   410  and the BS # 2   420  (step  537 ). The BS # 2   420  receives an Ncode from the BS # 1   410  through the wireless back haul link. After the wireless back haul link is configured, the BS # 1   410  notifies the MS  430  that a Tcode used in the BS # 2   420  is discarded and an Ncode is used (step  539 ). After the wireless back haul link is configured, the BS # 2   420  updates a system operating parameter used in an air link, discards the Tcode which the BS # 2   420  has used, and uses a code for a normal air operation, i.e., an Ncode (step  541 ). 
         [0067]      FIG. 6  schematically illustrates an operation process of an MS  430  illustrated in  FIG. 5 . 
         [0068]    Referring to  FIG. 6 , the MS  430  performs a scan operation for neighbor BSs in step  611 . The MS  430  detects an Ncode and a Tcode after performing the scan operation in step  613 . The MS  430  detects SI for the BS # 1   410  which transmits the Ncode and SI for the BS # 2   420  which transmits the Tcode in step  615 . The MS  430  transmits a random access code to the BS # 1   410  through a RACH in step  617 . The MS  430  performs a network entry procedure with the BS # 1   410  in step  619 . 
         [0069]    The MS  430  transmits a new BS information report message to the BS # 1   410  in step  621 . The MS  430  receives an FLCP start code transmission request message from the BS # 1   410  in step  623 . The MS  430  transmits an FLCP start code to the BS # 2   420  in step  625 . The MS  430  is notified that the BS # 2   420  discards the Tcode and uses the Ncode by the BS # 1   410  in step  627 . 
         [0070]      FIG. 7  schematically illustrates an operation process of a BS # 1   410  illustrated in  FIG. 5 . 
         [0071]    Referring to  FIG. 7 , the BS # 1   410  transmits an Ncode in step  711  and receives a random access code from an MS  430  in step  713 . The BS # 1   410  performs a network entry procedure with the MS  430  in step  715 . The BS # 1   410  receives a new BS information report message from the MS  430  in step  717 . The BS # 1   410  determines to perform an FLCP with a BS # 2   420  in step  719 . The BS # 1   410  transmits an FLCP start code transmission request message to the MS  430  and MSs which are connected to the BS # 1   410  in step  721 . The BS # 1   410  performs an FLCP with the BS # 2   420  during a preset time at a preset timing point in step  723 . The BS # 1   410  notifies the MS  430  that the Tcode used in the BS # 2   420  is discarded and an Ncode is used to in step  725 . 
         [0072]      FIG. 8  schematically illustrates an operation process of a BS # 2   420  illustrated in  FIG. 5 . 
         [0073]    Referring to  FIG. 8 , the BS # 2   420  is newly deployed and powered on in step  811  and transmits a Tcode in step  813 . The BS # 2   420  receives an FLCP start code from an MS  430  in step  815 . The BS # 2   420  performs an FLCP with a BS # 1   410  in step  817 . The BS # 2   420  receives an Ncode from the BS # 1   410  through a wireless back haul link in step  819 . The BS # 2   420  discards the Tcode and uses the Ncode in step  821 . 
         [0074]      FIG. 9  schematically illustrates an internal structure of an MS in a wireless communication system according to embodiments of the present disclosure. 
         [0075]    Referring to  FIG. 9 , an MS ( 900 ) includes a transmitter  911 , a controller  913 , a receiver  915 , and a storage unit  917 . 
         [0076]    The controller  913  controls the overall operation of the MS  900 . In particular, the controller  913  controls the MS  900  to perform an operation related to a wireless back haul link configuration operation between an old BS and a new BS. The operation related to the wireless back haul link configuration operation between the old BS and the new BS is performed in the manner described before with reference to  FIGS. 4A to 6 . The storage unit  917  stores a program and data related to the operation of the MS  900 . 
         [0077]    The transmitter  911  transmits signals and messages to the old BS and the new BS under a control of the controller  913 . The transmitter  911  transmits the signals and the messages to the old BS and the new BS in the manner described before with reference to  FIGS. 4A to 6 . 
         [0078]    The receiver  915  receives signals and messages from the old BS and the new BS under a control of the controller  913 . The receiver  915  receives the signals and messages from the old BS and the new BS in the manner described before with reference to  FIGS. 4A to 6 . 
         [0079]    The transmitter  911 , the controller  913 , the receiver  915 , and the storage unit  917  are shown in  FIG. 9  as separate units for convenience of description. In other words, two or more of the transmitter  911 , the controller  913 , the receiver  915 , and the storage unit  917  may be incorporated into a single unit. 
         [0080]      FIG. 10  schematically illustrates an internal structure of an old BS in a wireless communication system according to embodiments of the present disclosure. 
         [0081]    Referring to  FIG. 10 , an old BS ( 1000 ) includes a transmitter  1011 , a controller  1013 , a receiver  1015 , and a storage unit  1017 . 
         [0082]    The controller  1013  controls the overall operation of the old BS  1000 . In particular, the controller  1013  controls the old BS  1000  to perform an operation related to a wireless back haul link configuration operation between the old BS and a new BS. The operation related to the wireless back haul link configuration operation between the old BS and the new BS is performed in the manner described before with reference to  FIGS. 4A to 4D ,  FIG. 5 , and  FIG. 7 . The storage unit  1017  stores a program and data related to the operation of the old BS  1000 . 
         [0083]    The transmitter  1011  transmits signals and messages to an MS and the new BS under a control of the controller  1013 . The transmitter  1011  transmits the signals and the messages to the MS and the new BS in the manner described before with reference to  FIGS. 4A to 4D ,  FIG. 5 , and  FIG. 7 . 
         [0084]    The receiver  1015  receives signals and messages from the MS and the new BS under a control of the controller  1013 . The receiver  1015  receives the signals and messages from the MS and the new BS in the manner described before with reference to  FIGS. 4A to 4D ,  FIG. 5 , and  FIG. 7 . 
         [0085]    The transmitter  1011 , the controller  1013 , the receiver  1015 , and the storage unit  1017  are shown in  FIG. 10  as separate units for convenience of description. In other words, two or more of the transmitter  1011 , the controller  1013 , the receiver  1015 , and the storage unit  1017  may be incorporated into a single unit. 
         [0086]      FIG. 11  schematically illustrates an internal structure of a new BS in a wireless communication system according to embodiments of the present disclosure. 
         [0087]    Referring to  FIG. 11 , a new BS ( 1100 ) includes a transmitter  1111 , a controller  1113 , a receiver  1115 , and a storage unit  1117 . 
         [0088]    The controller  1113  controls the overall operation of the new BS  1100 . In particular, the controller  1113  controls the new BS  1100  to perform an operation related to a wireless back haul link configuration operation between an old BS and the new BS. The operation related to the wireless back haul link configuration operation between the old BS and the new BS is performed in the manner described before with reference to  FIGS. 4A to 4D ,  FIG. 5 , and  FIG. 8 . The storage unit  1117  stores a program and data related to the operation of the new BS  1100 . 
         [0089]    The transmitter  1111  transmits signals and messages to an MS and the old BS under a control of the controller  1113 . The transmitter  1111  transmits the signals and the messages to the MS and the old BS in the manner described before with reference to  FIGS. 4A to 4D ,  FIG. 5 , and  FIG. 8 . 
         [0090]    The receiver  1115  receives signals and messages from the MS and the old BS under a control of the controller  1113 . The receiver  1115  receives the signals and messages from the MS and the old BS in the manner described before with reference to  FIGS. 4A to 4D ,  FIG. 5 , and  FIG. 8 . 
         [0091]    The transmitter  1111 , the controller  1113 , the receiver  1115 , and the storage unit  1117  are shown in  FIG. 11  as separate units for convenience of description. In other words, two or more of the transmitter  1111 , the controller  1113 , the receiver  1115 , and the storage unit  1117  may be incorporated into a single unit. 
         [0092]    As is apparent from the foregoing description, the present disclosure enables to automatically configure a wireless back haul link between an old BS and a new BS in a wireless communication system. 
         [0093]    The present disclosure enables to configure a wireless back haul link between an old BS and a new BS in a region in which a wired back haul link may not be provided in a wireless communication system. 
         [0094]    The present disclosure enables to configure a wireless back haul link between an old BS and a new BS without limiting link coverage among Base Stations (BSs) in a wireless communication system. 
         [0095]    The present disclosure enables to configure a wireless back haul link between an old BS and a new BS using a dedicated resource as necessary in a wireless communication system. 
         [0096]    Although the present disclosure has been described with certain embodiments, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.