KR20140052786A - Method and apparatus for transmitting and receivng common channel information in wireless communication system - Google Patents

Abstract

The present invention relates to an initial connection method of a wireless communication system and a device for the same and, more specifically, a method for transmitting common channel information from a base station to a wireless communication system using a beam forming method in which multiple antennas are used. The present invention includes a step of confirming the number of beam used in transmission to a terminal; a step of generating the common channel information corresponding to the number of the confirmed beams; and a step of transmitting the common channel information to the terminal through the beam. The present invention can provide an efficient initial connection method for low power transmission in an FE-MIMO system including dozens or more than dozens of transmission antennas.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a method and apparatus for transmitting and receiving common channel information in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a wireless mobile communication system, and in particular, to a mobile communication system using beamforming using multiple input multiple output (MIMO) And an apparatus and method for transmitting and receiving common channel information.

The present mobile communication system is moving away from providing initial voice-oriented services and is developing a high-speed and high-quality wireless packet data communication system for providing data service and multimedia service. To this end, the 3GPP, 3GPP2, and IEEE standardization organizations are working on a third-generation evolved mobile communication system standard using a multi-carrier multiple access scheme. Recently, a variety of mobile communication standards such as 3GPP Long Term Evolution (LTE), 3GPP2 Ultra Mobile Broadband (UMB) and IEEE 802.16m have been developed based on a multi-carrier multiple access scheme, It was developed to support wireless packet data transmission service.

   Meanwhile, in a wireless mobile communication system, a terminal must perform an initial access process for communication with a base station. In the initial connection, the terminal receives a synchronous signal or a synchronous channel (SCH) to acquire forward synchronization with the base station, and additionally confirms a frame timing or a cell ID And also includes a process of receiving unique information of the system, the base station, or the cell together.

Standard adopts a multiple access technique using multiple subcarriers such as OFDM (A) (orthogonal frequency division multiplexing (multiple access)) as a multiple access technique. In the case of a wireless mobile communication system using a multiple access scheme using multiple subcarriers, the number of time symbols and subcarriers on the time and frequency, channel estimation and measurement performance. In addition, channel estimation and measurement performance are also affected by how much power is allocated to the reference signal. Therefore, when radio resources such as more time, frequency, and power are allocated to the reference signal, channel estimation and measurement performance are improved to demodulate and decode received data symbols decoding performance and channel state measurement accuracy.

However, in a general mobile communication system, since radio resources such as time, frequency, and transmission power for transmitting a signal are limited, when a large amount of radio resources are allocated to a reference signal, a radio resource Is relatively decreased. For this reason, the radio resources allocated to the reference signal should be appropriately determined in consideration of the system throughput. In particular, when MIMO (Multiple Input Multiple Output), which performs transmission and reception using a plurality of antennas, is applied, it is very important to assign a reference signal and measure it. Meanwhile, existing third generation mobile communication systems such as LTE, UMB, and 802.16m are based on a multi-carrier multiple access scheme as described above, and MIMO is applied to improve transmission efficiency And beamforming to improve the system capacity performance by improving transmission efficiency. In addition, efforts are underway to improve the transmission efficiency by further improving and developing MIMO and beamforming. (FD-MIMO) is one of the efforts to improve the transmission efficiency by making various types of beams using dozens of antennas.

The FD-MIMO technique is a method for transmitting data by making a small and long transmission beam using a plurality of antennas, thereby enabling fast data transmission with a small transmission power to terminals located far from the base station. In FD-MIMO, the type of beam that can be created depends on the number of antennas, and the size, distance, and width of the beam can be freely adjusted according to the weight applied to the antenna.

The concept of the FD-MIMO will be described with reference to FIG. 1 is a view for explaining the concept of FD-MIMO.

The base station shown at 101 in FIG. 1 uses FD-MIMO technology and controls three cells shown at 102, 103, and 104. For the cell 102, the base station 101 must support sufficient data transmission / reception for all the terminals belonging to the cell area. The base station 101 must guarantee satisfactory data transmission to the terminal located at the cell edge (cell edge), for example, the terminal 110 of FIG. 1, for the cell 102. Since FD-MIMO technology is used, it is possible to generate and transmit the same thin beam through a plurality of antennas. Therefore, even if the transmission power is very small compared to the case where the existing beamforming is not used, And data transmission is enabled to the terminal 110 as shown in FIG. That is, if beamforming for generating a thin beam using FD-MIMO is enabled, the transmission power for transmitting the same data can be greatly reduced compared with the conventional method.

Based on the low transmission power characteristics of the FD-MIMO, the base station 101 can maintain the transmission power for the cell 102 as small as possible. If the transmission power of the base station can be reduced as described above, the range of the power supported by the power amplifier installed in the base station 101 can be reduced, and the price of the power amplifier is greatly reduced. Since the price of the power amplifier is a big factor in determining the price of the base station itself, it is a great advantage of the FD-MIMO that the price of the power amplifier can be lowered accordingly and the overall price of the base station can be reduced accordingly. In addition, since the average power consumption of the base station can be reduced, it is also an advantage of FD-MIMO that it is possible to implement environment-friendly green communication.

However, when the conventional method using no beamforming is used, data transmission over the entire cell is impossible with the reduced transmission power due to the use of the FD-MIMO. In FIG. 1, when using an existing method that does not use beamforming using FD-MIMO, a space where data can be transmitted is limited to a distance of 105 instead of the entire cell shown by 102. [

When the terminal is located at the farthest position in the cell as in the terminal 110, it is possible to transmit data to the terminal with a small transmission power using the beamforming gain . However, in the case of data to be received by all UEs belonging to one cell other than a specific UE, the Node B 101 can not generate a signal capable of covering the entire cell by only transmitting power considering the power gain of FD-MIMO do. For example, in order to generate a signal that can be received at one time by the terminals 110, 121, and 122 belonging to the cell 102 in FIG. 1, the transmission power must be increased so as to cover the entire cell. The base station 101 can not support such transmission power.

As described above, there are various signals that must be received by all the UEs belonging to one cell. In the LTE system, for example, a synchronization channel (hereinafter, referred to as " Hereinafter, common channel information such as a Broadcast Channel (BCH) transmitted by a base station to a UE belonging to a cell to inform cell information may be a signal to be transmitted to all UEs belonging to the cell .

In this way, a base station supported by the FD-MIMO maintains the advantage of low transmission power, and a channel transmitted only to one UE, that is, a dedicated channel, as well as a channel transmitted to all UEs belonging to the cell, a new system is required to support even common channels.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for transmitting a different synchronization signal in accordance with a transmission beam in order to enable effective initial connection of a terminal in a MIMO system based on an LTE-A system and having a plurality of antennas, And to provide a method and apparatus for transmitting data. In particular, it is an object of the present invention to provide an effective initial access method for low-power transmission in an FD-MIMO system having dozens or more transmit antennas.

 In order to solve the above problems, in a mobile communication system using beamforming using multiple antennas according to the present invention, a common channel information transmission method of a base station includes checking the number of beams to be used for transmission to a terminal, And transmitting the common channel information to the terminal via an arbitrary beam.

In addition, in the mobile communication system using beamforming using multiple antennas according to the present invention, a common channel information reception method of a terminal includes receiving common channel information transmitted from a base station, and using the received common channel information, And receiving and processing a signal transmitted from a base station based on the obtained frame timing, wherein the common channel information is generated corresponding to the number of beams used by the base station, To the terminal through the base station.

In addition, in the mobile communication system using beamforming using multiple antennas according to the present invention, a base station for transmitting common channel information includes a transceiver for transmitting and receiving signals to and from a terminal, and a transmitter for checking the number of beams to be used for transmission to the terminal, Generating common channel information corresponding to the number of beams, and controlling the common channel information to be transmitted to the terminal through an arbitrary beam.

In a mobile communication system using beamforming using multiple antennas according to the present invention, a terminal receiving common channel information includes a transmitter / receiver for transmitting / receiving signals to / from a base station, and common channel information transmitted from a base station, And a control unit for obtaining a frame timing by using the channel information and controlling the reception and processing of a signal transmitted from the base station based on the obtained frame timing, wherein the common channel information includes a number of beams used by the base station And is transmitted from the base station to the terminal through an arbitrary beam.

According to embodiments of the present invention, it is possible to provide an effective initial connection method for low-power transmission in an FD-MIMO system having dozens or more transmit antennas.

1 is a view for explaining the concept of FD-MIMO;
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly,
3 is a diagram showing a frame structure of SCH and BCH used in the current LTE system;
4 is a diagram illustrating a method for enabling a common channel to be received over all cells using multiple beams according to an embodiment of the present invention.
5 is a diagram illustrating a process of transmitting an SCH in an LTE system using beam sweep;
6 is a view showing an operation of a terminal that receives an SCH when beam sweeping is applied according to the first embodiment;
7 is a diagram showing a transmitter operation of a base station that transmits an SCH when beam sweeping is applied according to the first embodiment;
8 is a diagram showing the operation of a terminal when beam sweeping is applied according to the third embodiment and the method of analyzing the BCH varies according to the sweeping beam.
9 is a diagram showing transmission and reception operations of a base station that transmits different BCH and BIB for each beam when beam sweeping is applied according to the third embodiment;

Hereinafter, 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 may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

While the embodiments of the present invention will be described in detail, the OFDM-based wireless communication system, particularly the 3GPP EUTRA standard, will be the main object of the present invention, but the main point of the present invention is to provide a communication system It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In the 3GPP LTE mobile communication system, a task performed by the UE for the first time to communicate with the BS is an initial access process. In the initial access procedure, the UE acquires an ID of a base station, adjusts a frame timing, synchronizes a subframe with a base station, receives a base station signal, acquires system information of the base station through the received signal, And a series of processes of establishing a link of downlink and uplink through random access.

In FIG. 2, the initial connection process is shown in a flow diagram. FIG. 2 is a flowchart showing the procedures for performing an initial connection procedure performed by the UE in the wireless communication system.

In step 201, when the terminal attempts to start communication with the base station, the BS searches for a SCH (Synchronous Channel) transmitted by the base station (202). The SCH includes a Primary Synchronous Signal (PSS) (or a first synchronous signal, hereinafter the same) and a Secondary Synchronous Signal (SSS) (or a second synchronous signal, hereinafter the same) Frame timing of the base station is found, and if the SSS is received at 204, the accurate base station frame timing and the ID of the base station can be known and the position of the CRS (cell-specific reference signal) can be known. It is a step that can receive the signal.

In step 205, a BCH (Broadcast Channel) is received. The BCH includes a master information block (MIB), which is system unique information. The MIB includes scheduling information for a system information block (SIB), which is more specific system information. When the UE receives the MIB information through the BCH reception at 206, the UE acquires scheduling information for the SIB included in the MIB information and transmits the downlink shared channel (SIB) (DL-SCH) to obtain the SIB information, so that the system-specific information can be known as a whole. The SIB information includes carrier information, cell band width, surrounding cell information, and information necessary for random access. Accordingly, the MS continuously performs a random oversampling operation such as 207 to request communication from the BS Finally, in step 208, the UE can transmit / receive data to / from the BS.

3 is a diagram showing a frame structure of SCH and BCH used in the current LTE system.

One (radio) frame of 301 includes 10 subframes. All frames are transmitted in the first subframe 302 and the 6th subframe 303 among the 10 subframes contained therein. . In addition, the BCH 304 is further transmitted in the first frame. That is, in the first frame of the radio frame, both SCH and BCH are transmitted.

The SCHs 302 and 303 include PSS and SSS. The terminal can receive the SCHs 302 and 303 and obtain the frame timing. In LTE, the terminal uses one SCH for the SCH of 303 and another code for the 303, and the terminal transmits one SCH to the PSS 306 and the SSS 305 In the LTE system, three PSSs are defined as a whole, and a total of 168 SSSs are defined. In this case, one cell uses one of three PSSs and one of 168 SSSs. As a result, one cell takes one of 504 cell IDs formed by a combination of PSS and SSS.

The PSS uses the same symbols in the first sub-frame 302 and the sixth sub-frame 303. Accordingly, when the PSS is received, the UE obtains the subframe timing and can receive the SSS received immediately before the PSS. On the other hand, the SSS can obtain frame timing even if the UE receives only one of the two SSSs by differently mapping subcarriers in the first subframe 302 and the sixth subframe 303.

As described above with reference to FIG. 2, the UE obtains the frame timing and the cell ID by receiving the SCH including the PSS and the SSS. Then, the UE checks the location of the CRS and receives the BCH 304 as coherent reception is possible do. The BCH is transmitted only in the first subframe in one frame as shown in 307 of FIG. 3, and is transmitted using the first four OFDM symbols included in the second slot in the subframe. The terminal receives the BCH over a plurality of frames, receives system information included in the BCH, performs random access, and performs operations required for communication with other base stations.

Meanwhile, considering the beamforming gain obtained by using FD-MIMO, the transmission power of the base station can be reduced while maintaining the cell coverage. In this case, when data is transmitted to one UE, data can be transmitted using beamforming. However, when data is to be transmitted to a plurality of UEs at once, for example, SCH and BCH The beamforming can not be used for the transmission of the same common channel and therefore the common channel can not be transmitted to all of the plurality of UEs throughout the cell with the reduced transmission power according to the use of the FD-MIMO.

The present invention proposes a method for overcoming this problem, and a major technical idea according to an embodiment of the present invention is to transmit the common channel to all the regions in one cell by separately sending the technical idea according to an embodiment of the present invention by using a plurality of beams .

4 is a diagram illustrating a method for enabling a common channel to be received over all cells using multiple beams according to an embodiment of the present invention.

As shown in FIG. 4, the cell controlled by the base station 401 in FIG. 4 includes all the areas covered by four beams 402 to 406. In other words, the beam of a single beam, for example 402, can not cover the entire cell by using the transmission power available to the base station 401. As a result, It can not be transmitted to all terminals included in the cell coverage. 4, the same information can not be transmitted to the terminal 411 and the terminal 412 by using one beam.

Therefore, in the present invention, it is proposed to use a beam sweeping method. In this case, the beam sweeping means transmitting a plurality of different beams over different time periods. That is, if the first beam shown at 402 is transmitted at the first time point, then the second beam of 403 is transmitted at the second time point, then the third beam of 404, the fourth beam of 405, and finally the fifth beam of 406 At the third point of time, the fourth point of time, and the fifth point of time.

Although FIG. 4 uses five beams to cover the entire cell as an example, there is a possibility that a variable number of beams may sometimes be used as long as the number of beams used in an actual system may be any number. The terminal 411 of FIG. 4 can receive the common channel using the second beam 403, and the terminal 412 can receive both the third beam 404 and the fourth beam 405, It is possible to receive a common channel using all of the beams. The same information may be transmitted on the common channel transmitted using the five beams 402 to 406 shown in FIG. 4, and information including different information may be transmitted on a beam-by-beam basis. In the following description, when the beam sweeping is used, definitions of SCH and BCH necessary for initial connection, a method for the base station to transmit the channel, and a reception operation for the channel of the terminal will be described. The term 'beam' referred to in the present invention may refer to a signal transmitted through beamforming using multiple antennas or a beam coverage to which the signal is transmitted. The term " beam " may thus be replaced by a term that may include the above meaning.

The FD-MIMO technique, which is the basis of the present invention, will be described below.

Example 1: Sweeping  Used SCH  send

As described above, the UE performs initial connection to access the initial base station. In the case of a base station using FD-MIMO, it is necessary to use a beam sweeping method for the forward common channel required for initial connection. The frame structure, the number of beams, and other specific portions of the present embodiment will be described with reference to the frame structure of the current LTE system and the initial access scheme. However, the present invention is not limited to the above- .

When using beam sweeping, common channels such as SCHs are transmitted at different timings across all beams. As shown in FIG. 3, in order for an SCH transmitted over two subframes within one frame to be transmitted over a plurality of beams at different timings, the SCHs that span the same two subframes are divided into several different timings Used for SCH.

In FIG. 5, SCH is transmitted in an LTE system using beam sweeping. The SCHs shown in 501 and 506 are portions where SCHs used in the existing LTE system are transmitted. In the case of using beam sweeping for FD-MIMO, since the SCHs transmitted in 501 and 506 are transmitted using one of the beams from 402 to 406 in FIG. 4, The SCH of 506 can not be received.

Accordingly, in the embodiment of the present invention, an additional SCH is generated for beam sweeping as shown in FIG. 5, and another SCH is transmitted for each beam. 5, since there are five SCHs when five beams are required, SCH2, 503, and 508 of SCH1, 502, and 507 of 501 and 506 SCH 5, SCH 5, SCH 5, SCH 5, SCH 5, SCH 5, SCH 5, and SCH 5 are transmitted using different beams over different timings as shown in FIG. 5. At this time, the number of the SCH and the number of the beam can be arbitrarily mapped, and the order of the SCH and the beam may be the same or may be randomly mapped by another method.

In the present embodiment, the number of SCHs is five, because five beams are used. However, when five or fewer beams are used, the required number of SCHs can be selected from among the five SCHs shown in FIG. 5 And the position of the SCH to be used can be determined arbitrarily or according to a predetermined rule. As a rule for determining the position of the SCH, it is possible to use as many subframes as the number of SCHs in the first subframe in order.

In this case, the PSS included in the SCH may be different according to different SCHs, i.e., different beams. That is, the PSS that can be used according to each subframe may be limited, SCH to know the position of the subframe in the frame. In this case, even if the terminal is located at any position in the cell, if the PSS and the SSS codes of the SCH determined according to the beam received by the terminal are received, it is determined how many subframes are present in one frame So that it is possible to know only one SCH reception. In order to generate one or more different PSS codes, first, a reference PSS code is generated, and cyclic shifts of different sizes are performed on the reference PSS code to generate several different PSS codes. Alternatively, it is possible to generate a number of different PSS codes through different scrambling operations on one reference PSS code.

6 is a diagram showing an operation of a terminal that receives an SCH when beam sweeping is applied according to the first embodiment. FIG. 6A is a block diagram showing an internal structure of a terminal according to the first embodiment, and FIG. 6B is a flowchart showing an operation procedure of the terminal.

The terminal receiver of 601 receives the SCH in step S601. In step S602, the MS determines code of the PSS and the SSS included in the SCH through a code discriminator 602. [ In step S603, the terminal captures the frame timing in the controller 603 using the received code. The controller 603 controls the receiver 601 to decode the signal received through the decoder 604 in step S604 in accordance with the frame timing.

The decoder may be used to decode BCH, PDSCH, and other signals.

7 is a diagram showing a transmitter operation of a base station that transmits an SCH when beam sweeping is applied according to the first embodiment. FIG. 7A is a block diagram showing the internal structure of the base station according to the first embodiment, and FIG. 7B is a flowchart showing the operation sequence of the base station.

First, the SCH code generator 701 checks the number of beams to be used in step S701. In step S702, the SCH code generator 701 receives the control information of the controller 702 and generates codes PSS and SSS to be transmitted to the SCH according to the number of beams, and transmits the codes to the transmitter 703.

Then, in step S703, the transmitter 703 transmits the SCH including the corresponding code by the controller using the beam determined by the controller in the subframe determined by the controller under the control of the controller 702. [

Example 2: Sweeping  Used BCH  send

In the second embodiment of the present invention described below, BCH reception according to the position of the UE will be described.

In the case of using the beam sweep of the present invention, the SCH is transmitted in all subframes based on the LTE system as shown in FIG. However, as shown in 513 of FIG. 5, the BCH is transmitted using four OFDM symbols following the SCH in a subframe in which a preceding SCH is transmitted for two SCH pairs. When the BCH is beam swept in the same manner as the SCH, the BCH is transmitted through 501 to 505 subframes.

The reception of the BCH is performed by first determining the position of the BCH using the frame timing obtained through the SCH. The MIB, which is information common to all cells, is transmitted to the BCH. The MIB includes scheduling information of the SIB for receiving SIB, which is more specific system information. When beam sweeping is performed using FD-MIMO, The invention introduces beam specific information (BIB). That is, the terminal receives the MIB through the BCH transmitted from the base station, and the MIB includes the scheduling information for the BIB. At this time, the terminal receives another MIB according to the received beam, So that it can receive other BIBs. That is, when a terminal receiving an arbitrary beam receives a BCH transmitted through the beam, system information corresponding to the beam is obtained. That is, the information required for the UE changes depending on the beam, so the BCH to be transmitted on a beam-by-beam basis is taken differently so that another BIB can be received on another beam. . Of course, the information common to the cells, regardless of the beam, is transmitted to the BCH using the same MIB information for all beams.

5, for example, the BCH transmitted through the 501 subframe includes the MIB corresponding to the first beam, and the MIB includes SIB, which is information required for all the cells, and one And the scheduling information for receiving the BIB corresponding to the beam. In addition, the BCH transmitted through the subframe 502 includes the MIB corresponding to the second beam, and the MIB can receive the SIB, which is information required for all the cells, and the BIB corresponding to the second beam among the total 5 beams And the scheduling information. The MIB corresponding to the third beam transmitted through the subframe 503 is included. The MIB includes SIB, which is information required for all cells, and scheduling information for receiving the BIB corresponding to the third beam among all 5 beams . The BCH transmitted through the subframe 504 includes an MIB corresponding to the fourth beam, and the MIB can receive the SIB, which is information necessary for all cells, and the BIB corresponding to the fourth beam among all five beams And scheduling information. The BCH transmitted through the subframe 505 includes the MIB corresponding to the fifth beam, and the MIB can receive the SIB, which is information required for all cells, and the BIB corresponding to the fifth beam among all five beams And scheduling information. The BIB may include other information necessary to transmit and receive using the beam pattern. For example, the BIB may include random access parameter related information, power control information, or TDD forward / Information and so on. In particular, the reverse random access related information includes resource information for transmitting a UL RACH. When UL RACH resources are used for each beam, the BS transmits UL- It is possible to determine whether or not to transmit the RACH, thereby increasing the reception beamforming gain and transmitting the response to the UL-RACH using the same beam, thereby obtaining a transmission beamforming gain as well. If the type of the beam received by the terminal changes due to a position change in the cell, the BIB must be transmitted to the terminal again for the BIB for the newly received beam. In this case, the UE can receive the BIB included in the BCH transmitted through the new beam, and the BIB can be directly transmitted to the UE using the DL-SCH.

Example 3: Sweeping  Following BCH  Interpretation method

The present embodiment describes a reverse random access method according to the location of a terminal. In the first embodiment, when beam sweeping is used, it is described that the UE captures frame timing by taking different SCHs for each subframe and transmitting different SCHs for each beam. Based on the LTE system, the SCH is transmitted in all subframes, and the BCH, as shown in 513 of FIG. 5, transmits four OFDM symbols following the SCH in the subframe in which the preceding SCH is transmitted for two SCH- . When the BCH is beam swept in the same manner as the SCH, the BCH is transmitted through 501 to 505 subframes. In the present embodiment of the present invention, the BCH includes the relationship between the SCH and the beam, and information on the operation of the UE according to the beam. That is, the UE having received the SCH can obtain the information on the currently received beam through the BCH. At this time, the terminal receiving the SCH in different subframes is different from the receiving beam, so information about the beam is different. At this time, not only the information about the beam but also the BCH information to be analyzed according to the beam received by the terminal, that is, the MIB information indicating the location of the BIB, is changed. The information that varies depending on the beam may include other information necessary for transmitting and receiving using a beam pattern. As described above, information related to random access parameters, power control information, or TDD Forward / reverse configuration information, and the like.

FIG. 8 is a diagram illustrating an operation of a terminal when beam sweeping is applied according to the third embodiment and a method of analyzing a BCH varies according to a sweeping beam. In this case, FIG. 8A is a block diagram showing the internal structure of the terminal, and FIG. 8B is a flowchart showing the operation procedure of the terminal.

The terminal receiver of 801 receives the SCH in step S801 through the reception operation of 801 and the SCH discriminator of 802. At the same time, in step S802, the terminal receiver can read the BCH with the BCH decoder of 803.

In step S803, the terminal receiver inputs the SCH information and the BCH information, i.e., MIB information, to the controller 804. [ In step S804, the controller 804 obtains the scheduling information through which the BIB is transmitted through the two pieces of information. The controller 804 controls the receiver 801 to transmit the DL-SCH And receives the BIB information as indicated by reference numeral 805.

The BIB information 805 is input to the transmission controller 806 again, and the transmission controller 806 can acquire the reverse random access information included in the BIB, particularly UL-RACH resource information, in step S806. Then, in step S807, the transmission controller controls the transmitter of 807 using the obtained reverse random access information, and the terminal performs a reverse random access on the resource corresponding to the UL-RACH resource information included in the BIB.

9 is a diagram illustrating transmission and reception operations of a base station that transmits different BCH and BIB for each beam when beam sweeping is applied according to the third embodiment. In this case, FIG. 9A is a block diagram showing the internal structure of the base station, and FIG. 9B is a flowchart showing the operation sequence of the base station.

The controller of 901 controls the MIB generator of 902, and in step S901, the MIB includes scheduling information for different BIBs by beam.

In step S902, the controller 901 controls the BIB generator 903 to generate a different BIB for each beam, and controls the transmitter of the 904 again. In step 903, the controller 901 controls the corresponding BCH and DL-SCH And transmits it.

In addition, the controller 901 controls the receiver 905 to control the reception of the UL-RACH transmitted by the terminal receiving the determined beam.

According to the embodiments of the present invention described above, it is possible to provide an effective initial connection method for low-power transmission in an FD-MIMO system having dozens or more transmission antennas.

The embodiments of the present invention disclosed in the present specification and drawings are intended to be illustrative only and not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

For example, although the internal structure of the terminal and the base station of the present invention has been described in detail with reference to the drawings, the terminal and the base station need not necessarily be limited to such a structure, and both a transceiver for transmitting / And a control unit for controlling the function of the controller. At this time, the functions performed by the control unit of each node are as described in detail in each section.

Claims (20)

A method of transmitting common channel information of a base station in a mobile communication system using beamforming using multiple antennas,
Confirming the number of beams to be used for transmission to the terminal;
Generating common channel information corresponding to the identified number of beams; And
And transmitting the common channel information to the terminal through an arbitrary beam. 2. The method according to claim 1,
And the different beams are transmitted to the terminal at different points in time. The method of claim 1,
Wherein the common channel information includes at least one of a synchronization channel and a broadcast channel. 4. The method of claim 3, wherein if the common channel information is a synchronization channel,
Wherein the synchronization channel includes a first synchronization signal and a second synchronization signal, and the first synchronization signal has different codes used for each beam. 4. The method of claim 3, wherein if the common channel information is a broadcast channel,
The broadcast channel includes a master information block, which is cell common information,
Wherein the master information block includes scheduling information for beam specifying information including system information for an arbitrary beam,
Wherein the beam identification information includes at least one of reverse random access related information, power control information, or TDD forward reverse configuration information. A method of receiving common channel information of a terminal in a mobile communication system using beamforming using multiple antennas,
Receiving common channel information transmitted from a base station;
Obtaining frame timing using the received common channel information; And
And receiving and processing a signal transmitted from the base station based on the obtained frame timing,
Wherein the common channel information is generated corresponding to the number of beams used by the base station and is transmitted from the base station to the terminal through an arbitrary beam. 7. The method of claim 6,
And the different beams are received at the terminal at different points in time. 7. The method of claim 6,
Wherein the common channel information includes at least one of a synchronous channel and a broadcast channel. 9. The method of claim 8, wherein when the common channel information is a synchronization channel,
Wherein the synchronization channel includes a first synchronous signal and a second synchronous signal, and the codes used for each beam are different for the first synchronous signal. The method of claim 8, wherein if the common channel information is a broadcast channel,
The broadcast channel includes a master information block, which is cell common information,
Wherein the master information block includes scheduling information for beam specifying information including system information for an arbitrary beam,
Wherein the beam identification information comprises at least one of reverse random access related information, power control information, or TDD forward reverse configuration information. A base station for transmitting common channel information in a mobile communication system using beamforming using multiple antennas,
A transceiver for transmitting and receiving signals to and from the terminal; And
And a control unit for checking the number of beams to be used for transmission to the terminal, generating common channel information corresponding to the number of the identified beams, and controlling the common channel information to be transmitted to the terminal through an arbitrary beam . 12. The apparatus according to claim 11,
And controls the different beams to be transmitted to the terminal at different points in time. 12. The method of claim 11,
A synchronization channel, or a broadcast channel. 14. The method of claim 13, wherein if the common channel information is a synchronization channel,
Wherein the synchronization channel includes a first synchronization signal and a second synchronization signal, wherein the codes used for each beam are different from each other. 14. The method of claim 13, wherein if the common channel information is a broadcast channel,
The broadcast channel includes a master information block, which is cell common information,
Wherein the master information block includes scheduling information for beam specifying information including system information for an arbitrary beam,
Wherein the beam identification information comprises at least one of reverse random access association information, power control information, or TDD forward reverse configuration information. A terminal for receiving common channel information in a mobile communication system using beamforming using multiple antennas,
A transmission / reception unit for transmitting / receiving signals to / from a base station; And
And a control unit for receiving the common channel information transmitted from the base station, acquiring the frame timing using the received common channel information, and controlling to receive and process a signal transmitted from the base station based on the obtained frame timing, ,
Wherein the common channel information is generated corresponding to the number of beams used by the base station and is transmitted from the base station to the terminal through an arbitrary beam. 17. The method of claim 16,
Wherein different beams are received at the terminal at different points in time. 17. The method of claim 16,
A synchronization channel, and a broadcast channel. 19. The method of claim 18, wherein if the common channel information is a synchronization channel,
Wherein the synchronization channel includes a first synchronization signal and a second synchronization signal, wherein the codes used for each beam are different from each other. 19. The method of claim 18, wherein if the common channel information is a broadcast channel,
The broadcast channel includes a master information block, which is cell common information,
Wherein the master information block includes scheduling information for beam specifying information including system information for an arbitrary beam,
Wherein the beam identification information comprises at least one of reverse random access association information, power control information, or TDD forward reverse configuration information.

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