KR20180136757A - Apparatus and method for initial access in wireless communication system - Google Patents

Abstract

The disclosure relates to a 5G (5^th generation) or pre-5G communicating system capable of supporting a higher data transmitting rate than a 4G (4^th generation) communicating system such as long term evolution (LTE) or the like. According to various embodiments of the disclosure, a device of a terminal in a wireless communicating system comprises: at least one transceiver and at least one processor which is operatively combined with the at least one transceiver. The at least one processor receives first system information from a base station, receives second system information through a resource area indicated by the first system information, and connects the base station and radio resource control (RRC) based on the first system information and the second system information.

Description

[0001] APPARATUS AND METHOD FOR INITIAL ACCESS IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION [0002] This disclosure relates generally to wireless communication systems, and more specifically to an apparatus and method for initial access in a wireless communication system.

Efforts are underway to develop improved 5G (5 ^th generation) communication systems or pre-5G communication systems to meet the increasing demand for wireless data traffic after commercialization of 4G (4 ^th generation) communication systems. For this reason, a 5G communication system or a pre-5G communication system is referred to as a 4G network (Beyond 4G Network) communication system or a LTE (Long Term Evolution) system (Post LTE) system.

To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In the 5G communication system, beamforming, massive MIMO, full-dimensional MIMO, and FD-MIMO are used in order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave. ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed.

In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), and the Advanced Connection Technology (FBMC) ), Non-Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA).

In order to reduce the bandwidth increase in the fronthaul due to the increase of mobile data, the 5G communication system may be applied with a function hole between the central unit (CU) and a distributed unit (DU) function. In this case, the CU and the DU can be connected in many-to-many relationships, and congestion may occur in the DU provided with traffic from a plurality of CUs.

5G communication system considers operation of a system bandwidth that is larger than the system bandwidth defined in the current LTE communication system. Accordingly, a terminal supporting a bandwidth smaller than the system bandwidth may not normally receive system information or control information transmitted by the base station.

Based on the above discussion, the disclosure provides an apparatus and method for accessing a channel in a wireless communication system.

The present disclosure also provides an apparatus and method for initial access to a cell in a wireless communication system.

The present disclosure also provides an apparatus and method for transmitting system information in a wireless communication system.

The present disclosure also provides an apparatus and method for transmitting resource information indicating a resource to which system information is transmitted in a wireless communication system.

The present disclosure also provides an apparatus and method for setting a resource block grid in a wireless communication system.

The present disclosure also provides an apparatus and method for transmitting information indicative of bandwidth for an initial connection in a wireless communication system.

According to various embodiments of the present disclosure, in a wireless communication system, an apparatus of a terminal comprises at least one transceiver, at least one processor operatively coupled to the at least one transceiver, processor. Wherein the at least one processor is configured to receive first system information from a base station, receive second system information via a resource area indicated by the first system information, and receive, based on the first system information and the second system information, And to perform a radio resource control (RRC) connection with the base station.

According to various embodiments of the present disclosure, in a wireless communication system, a base station apparatus may include at least one transceiver and at least one processor operatively coupled to the at least one transceiver. Wherein the at least one processor transmits first system information through a broadcast channel and transmits second system information through a resource area indicated by the first system information, 2 system information with a terminal that has received the RRC (Radio Resource Control) connection.

The apparatus and method according to various embodiments of the present disclosure provide initial access information through transmission of system information in a base station operating a wide band in the system band even if the terminal does not support the system band, Increases the spectrum utilization and enables flexible operation for the UEs regardless of the bandwidth capability.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

Figure 1 illustrates a wireless communication environment in accordance with various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4 shows a flow diagram of a base station in a wireless communication system according to various embodiments of the present disclosure.
Figure 5 shows a flow diagram of a terminal in a wireless communication system according to various embodiments of the present disclosure.
6 illustrates an example of a system control area according to various embodiments of the present disclosure.
7 shows an example of first system information in a wireless communication system according to various embodiments of the present disclosure.
8A-8D illustrate examples of design of a system control area and second system information in a wireless communication system according to various embodiments of the present disclosure.
9 illustrates an example of a first system information and reference signal sequence in a wireless communication system according to various embodiments of the present disclosure.
10 illustrates an example of a bandwidth reconfiguration procedure between a base station and a terminal that has received system information in a wireless communication system according to various embodiments of the present disclosure.

The terms used in this disclosure are used only to describe certain embodiments and may not be intended to limit the scope of other embodiments. The singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. The general predefined terms used in this disclosure may be interpreted as having the same or similar meaning as the contextual meanings of the related art and, unless explicitly defined in the present disclosure, include ideally or in an excessively formal sense . In some cases, the terms defined in this disclosure can not be construed to exclude embodiments of the present disclosure.

In the various embodiments of the present disclosure described below, a hardware approach is illustrated by way of example. However, the various embodiments of the present disclosure do not exclude a software-based approach, since various embodiments of the present disclosure include techniques that use both hardware and software.

The present disclosure relates to an apparatus and method for initial connection in a wireless communication system. In particular, this disclosure describes a technique for configuring system information to be transmitted for initial access in a wireless communication system.

A term referring to a resource area (e.g., a bandwidth, a resource block, an offset, a resource block index, a block, a grid) used in the following description, terminology (e.g., base station, 5GNB) that refers to the elements of the device, the terms that refer to components of the device, and the like are illustrated for convenience of explanation. Accordingly, the present disclosure is not limited to the following terms, and other terms having equivalent technical meanings can be used.

Further, the present disclosure describes various embodiments using terms used in some communication standards (e.g., 3rd Generation Partnership Project (3GPP)), but this is merely illustrative. The various embodiments of the present disclosure can be easily modified and applied in other communication systems as well. Also, although the present disclosure is described as an example of a downlink for convenience of explanation, the apparatus and method according to various embodiments are also applicable to an uplink.

In an LTE communication system, a terminal performs an initial access procedure to connect with a base station. The terminal searches for a synchronization signal according to a channel raster (for example, 100 kHz) on the frequency axis to connect to the cell. Also, the terminal receives a synchronization signal from the base station to acquire a cell identity (ID) and time synchronization. Estimates the channel using the acquired cell ID, and decodes the broadcast channel through the estimated channel information. The terminal acquires a master information block (MIB) from the decoded broadcast channel. The terminal obtains the system bandwidth from the MIB. In an LTE communication system, the system bandwidth supported by the base station is one of six predefined bandwidths (1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz).

In the LTE communication system, the synchronization signal is located at the center of the system bandwidth, and the SIB (system information block) is allocated all over the system bandwidth. As a result, terminals capable of supporting up to 20 MHz, If only information on a subframe / slot is acquired, a physical downlink control channel (PDCCH) can be decoded by blind decoding. The terminal can acquire the SIB through PDCCH decoding. However, unlike the LTE communication system, a communication system (hereinafter referred to as a broadband operating communication system) for operating a system bandwidth that is wider than 20 MHz in current standards may not presuppose the above-described assumptions have. That is, the transmission area of the synchronization signal may not be located at the center of the system bandwidth. In addition, the maximum supportable bandwidth of some terminals in the cell may be narrower than the system bandwidth. In addition, the time-frequency resource area (e.g., PDCCH) to which the control information for the SIB is transmitted may be set to a size smaller than the system bandwidth. In this case, when the connection procedure in the existing LTE communication system is performed as it is, that is, when the system information (for example, MIB and SIB) defined in the LTE communication system is directly used, (A terminal whose bandwidth capability does not cover the system bandwidth) may fail to properly receive system information (e.g., SIB1, SIB2) transmitted from the base station.

Hereinafter, a method for indicating a region in which control information on system information such as SIB is transmitted in the LTE communication system is described in order to operate a system bandwidth that is wider than a wideband operating communication system, i.e., 20 MHz.

1 illustrates a wireless communication environment 100 in accordance with various embodiments of the present disclosure.

Referring to FIG. 1, a wireless communication environment 100 exemplifies a base station 110, a first terminal 120, and a second terminal 130 as a part of nodes using a wireless channel.

The base station 110 is a network infrastructure that provides a wireless connection to the first terminal 120 or the second terminal 130. The base station 110 has a coverage, or cell, defined as a certain geographic area based on the distance over which it can transmit signals. Hereinafter, the term 'cell' used may refer to a service coverage area at the base station. For convenience of description, the base station 110 of FIG. 1 is described as covering one cell (e.g., cell 115), but may also cover multiple cells. Here, a plurality of cells can be classified according to frequencies to be supported and regions of a sector to be covered. In the following description, a base station may be used as a term including a cell, or a cell may be used as a term referring to a base station. The base station 110 includes an 'access point (AP)', 'eNodeB', '5G node', '5G NodeB, NB' , 'Wireless point', 'transmission / reception point (TRP)', or other terms having equivalent technical meanings.

Each of the first terminal 120 and the second terminal 130 is a device used by a user and communicates with the base station 110 via a wireless channel. In some cases, at least one of the first terminal 120 and the second terminal 130 may be operated without user involvement. That is, at least one of the first terminal 120 and the second terminal 130 is an apparatus for performing machine type communication (MTC), and may not be carried by a user. Each of the first terminal 120 and the second terminal 130 may include a terminal, a user equipment (UE), a mobile station, a subscriber station, a remote terminal Quot ;, " wireless terminal ", or " user device ", or other terms having equivalent technical meanings.

Each of the first terminal 120 and the second terminal 130 may have different maximum bandwidths that can be supported. For example, the first terminal 120 may be a terminal supporting up to 20 MHz bandwidth. The second terminal 130 may be a terminal supporting up to a bandwidth of 100 MHz.

The base station 110 may perform a predetermined procedure to be connected to the first terminal 120 and the second terminal 130. The base station 110 may transmit a synchronization signal. The base station 110 may transmit a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The first terminal 120 (or the second terminal 130) can search for a synchronization signal every 100 kHz which is a raster interval for synchronization. The first terminal 120 can acquire the cell ID and time synchronization of the cell 115 by receiving the synchronization signal.

The base station 110 may transmit system information through a broadcast channel. Here, the system information transmitted through the broadcast channel may be referred to as first system information. The first system information may correspond to a MIB (master information block) of the LTE communication system. The first terminal 120 may receive the first system information. The first terminal 120 can decode the first system information through the channel information estimated using the acquired cell ID.

Base station 110 may transmit system information over a shared channel. Here, the system information transmitted through the shared channel may be referred to as second system information. The first terminal 120 may receive the second system information. The second terminal 120 may receive the second system information based on the system control area acquired through the first system information. The system control area may be an area including control information indicating a resource to which the second system information is transmitted. That is, the system control region may be a control channel for the shared channel. The system control area may be referred to as a control resource set (COREST).

Also, in this disclosure, a scheme for indicating a system control area through the first system information is described. Since the first system information is transmitted according to a high coding rate so that all terminals in the cell can receive, the number of bits that can be transmitted can be limited. Therefore, adding the position and size information of the system control area to the first system information may cause some overhead. Thus, the present disclosure describes a scheme for indicating, in the first system information, the position and size of the system control area with a smaller number of bits.

2 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as a configuration of the base station 110. FIG. Hereinafter, terms such as "part" and "group" refer to a unit for processing at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software have.

Referring to FIG. 2, the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs conversion between a baseband signal and a bit string according to a physical layer specification of the system. For example, at the time of data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. Also, upon receiving the data, the wireless communication unit 210 demodulates and decodes the baseband signal to recover the received bit stream. Also, the wireless communication unit 210 up-converts the baseband signal to an RF (radio frequency) band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna to a baseband signal.

To this end, the wireless communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), and an analog to digital converter (ADC). In addition, the wireless communication unit 210 may include a plurality of transmission / reception paths. Further, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit may include a plurality of subunits according to operating power, an operating frequency, .

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or a part of the wireless communication unit 210 may be referred to as a 'transmission unit', a 'reception unit', or a 'transmission / reception unit'. In the following description, the transmission and reception performed through the wireless channel are used to mean that the processing as described above is performed by the wireless communication unit 210. [

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, .

The storage unit 230 stores data such as a basic program, an application program, and setting information for operation of the base station. The storage unit 230 may be composed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 230 provides the stored data at the request of the control unit 240.

The control unit 240 controls the overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or through the backhaul communication unit 220. [ In addition, the control unit 240 records and reads data in the storage unit 230. [ The control unit 240 can perform functions of a protocol stack required by the communication standard. To this end, the control unit 240 may include at least one processor. According to various embodiments, the control unit 240 may include a system information mapping unit for mapping system information. The system information mapping unit may map the system information to be transmitted in a different bandwidth according to the type of the system information. Here, the system information mapping unit may be a set of instructions or code stored in the storage unit 230, or may be a storage space storing at least a command / code or instruction / code residing in the control unit 240 at least temporarily, may be part of the circuitry. For example, the control unit 240 may control the base station to perform operations according to various embodiments described below.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 can be understood as a configuration of the first terminal 120 or the second terminal 130. FIG. Hereinafter, terms such as "part" and "group" refer to a unit for processing at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software have.

Referring to FIG. 3, the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs conversion between a baseband signal and a bit string according to a physical layer specification of the system. For example, at the time of data transmission, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. Also, upon receiving the data, the communication unit 310 demodulates and decodes the baseband signal to recover the received bit stream. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal, transmits the RF band signal through the antenna, and down converts the RF band signal received through the antenna to a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In addition, the communication unit 310 may include a plurality of transmission / reception paths. Further, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit 210 may be composed of digital circuitry and analog circuitry (e.g., RFIC (radio frequency integrated circuit)). Here, the digital circuit and the analog circuit can be implemented in one package. In addition, the communication unit 310 may include a plurality of RF chains. Further, the communication unit 310 can perform beamforming.

In addition, the communication unit 310 may include different communication modules for processing signals of different frequency bands. Further, the communication unit 310 may include a plurality of communication modules to support a plurality of different wireless connection technologies. For example, different wireless access technologies may include Bluetooth low energy (BLE), Wireless Fidelity (Wi-Fi), WiGig (WiFi Gigabyte), cellular networks such as Long Term Evolution In addition, different frequency bands may include a super high frequency (SHF) band (e.g., 2.5 GHz, 5 GHz) and a millimeter wave (e.g., 60 GHz) band.

The communication unit 310 transmits and receives signals as described above. Accordingly, the communication unit 310 may be referred to as a 'transmission unit', a 'reception unit', or a 'transmission / reception unit'. In the following description, the transmission and reception performed through the wireless channel are used to mean that the processing as described above is performed by the communication unit 310. [

The storage unit 320 stores data such as a basic program, an application program, and setting information for operation of the terminal. The storage unit 320 may be composed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 320 provides the stored data at the request of the control unit 330.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. In addition, the controller 330 writes data to the storage unit 320 and reads the data. To this end, the control unit 330 may include at least one processor or a microprocessor, or may be part of a processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). In particular, according to various embodiments, the control unit 330 may include a decoder for decoding the system information received by the terminal. Here, the decoder may decode the first system information (MIB) transmitted through the broadcast channel or the second system information (SIB) transmitted through the shared channel. In addition, the control unit 330 may control the terminal 120 to perform operations according to various embodiments described below.

The initial access procedure

4 shows a flow diagram of a base station in a wireless communication system according to various embodiments of the present disclosure. FIG. 4 illustrates a method of operation of base station 110.

Referring to FIG. 4, in step 401, a base station can transmit first system information through a broadcast channel. The base station can broadcast the first system information. The base station can synchronize and multiplex the first system information and broadcast it. Here, the first system information multiplexed with the synchronization signal may be referred to as a synchronization signal block (SS).

The base station can inform the terminal of the system control area through the first system information. The system control area may include information on resources for which the second system information is transmitted. In other words, the system control area includes scheduling information of the second system information. For example, the first system information may indicate the position where the system control area indicating the scheduling of the second system information starts and the size of the system control area. The system control area may be referred to as a control resource set (CORESET). Resources in the system control area may be referred to as system control resources. The scheduling information of the second system information, and the resource to which the second system information is transmitted, may be referred to as a system resource.

Meanwhile, in some embodiments, the base station can notify the terminal of the range of the frequency region through which the second system information can be transmitted, i.e., the bandwidth, through the first system information. In other words, the first system information may include information on the bandwidth. For example, the first system information may include information about a specific bandwidth for an initial connection. As another example, the first system information may indicate the system bandwidth operated by the base station. In another example, the first system information may indicate a narrowband bandwidth at which the SS block is transmitted.

In some other embodiments, the bandwidth over which the second system information can be transmitted may be predefined between the base station and the terminal. For example, the UE can recognize that the second system information is transmitted on the bandwidth in which the SS block is transmitted.

In step 403, the base station may transmit the second system information through the resource area indicated by the first system information. The second system information may provide other information necessary for connection in addition to the connection information transmitted through the first system information. The second system information may be referred to as remaining minimum system information (RMSI). The second system information may correspond to an SIB (e.g., SIB1 or SIB2) in the LTE communication system. The second system information may include information for accessing the cell or may include scheduling information for other system information including information for connecting to the cell. Here, other system information may be referred to as OSI (other system information). The base station may mask (SI) (system information) -RNTI (cyclic redundancy check) masking (CRC) on the second system information to be transmitted. The base station may transmit the second system information via a shared channel (e.g., PDSCH).

The base station may transmit the second system information through the system resources indicated by the first system information. Specifically, the base station maps a symbol corresponding to the second system information to a location of resources (system resources) indicated by the system control area provided through the first system information, on a resource grid. And transmit the second system information to the terminal.

In step 405, the base station may perform RRC connection with the terminal that has received the first system information and the second system information. The base station may perform a random access procedure with the terminal. Specifically, the base station can receive the random access preamble from the terminal. The base station can transmit a response message to the UE in response to the random access preamble. The base station may receive information on the identity of the terminal from the terminal and may transmit a message for contention resolution to the terminal. The base station may perform a radio resource control (RRC) connection after performing a random access procedure with the mobile station. The base station may receive an RRC connection request message from the terminal. The base station may transmit an RRC connection setup message to the UE. The base station can receive an RRC connection setup completion message from the UE.

Although not shown in FIG. 4, the base station can transmit downlink data to the mobile station or receive uplink data from the mobile station after the establishment of the RRC connection.

Figure 5 shows a flow diagram of a terminal in a wireless communication system according to various embodiments of the present disclosure. 5 illustrates an operation method of the first terminal 120 (or the second terminal 130).

Referring to FIG. 5, in step 501, the terminal can receive first system information transmitted from a base station through a broadcast channel. The terminal can receive the SS block broadcasted by the base station. The terminal can acquire time synchronization by receiving a synchronization signal broadcast by the base station. The terminal can acquire the first system information after acquiring synchronization with the base station. Step 501, which is the operation of the other terminal, corresponds to step 401 of FIG. 4, which is the base station operation. The terminal may acquire the first system information by decoding a broadcast channel (e.g., a physical broadcast channel (PBCH), for example). The terminal may acquire a system control area from the acquired first system information .

In step 503, the terminal can receive the second system information through the resource area indicated by the first system information.

The resource area is a system control area, and can represent system resources to which the second system information is transmitted. The system control area can be indicated on the resource grid by the position where the allocation of the system control area is started and by the size of the system control area. In some embodiments, the resource area may represent, in bandwidth, the bandwidth over which the second system information is transmitted, i.e., the frequency range over which the second system information can be transmitted. For example, the bandwidth may be referred to as an initial access bandwidth, with a value below the maximum bandwidth that the terminal can support. As another example, the bandwidth may be a bandwidth of 20 MHz or more, which is the system bandwidth operated by the base station. In another example, the bandwidth may be the bandwidth of the narrow band to which the SS block was transmitted.

The terminal can decode a control channel (e.g., PDCCH) on a common search space using an SI-RNTI. The terminal can acquire the second system information through decoding. From the second system information, the terminal may acquire parameters for connecting to the cell or may include scheduling information for other system information including parameters for connecting to the cell. For example, the terminal may obtain random access-related parameters from the second system information. Step 503, which is the operation of the other terminal, corresponds to step 403 of FIG. 4, which is the base station operation. The terminal may obtain information on the location of system resources for receiving the second system information from the first system information. For example, the terminal may receive information on the location (e.g., RB index) of the system control area and the size of the system control area (e.g., number of RBs) indicating system resources for receiving second system information from the first system information, Can be obtained. The terminal can decode the system control area and obtain the location of the system resources. Here, the system control area may indicate an allocation type of system resources, or may indicate a location and a size. From the first system information, the terminal can receive information on the allocation of system resources.

In step 505, the terminal may perform an RRC connection with the base station based on the first system information and the second system information. The terminal may perform the random access procedure with the base station using the random access-related parameters acquired from the second system information. After performing random access with the base station, the terminal can perform an RRC connection procedure. Step 505, which is the operation of the terminal, corresponds to step 405 of Fig. 4, which is the base station operation.

Although not shown in FIG. 5, the UE may transmit uplink data to the base station or receive downlink data from the base station after the RRC connection is established.

비트일 수 있다. 예를 들어 15kHz의 서브캐리어 간격 (sub-carrier spacing, SCS) 및 100MHz의 시스템 대역폭을 운용중인 셀은, 500개의 물리 자원 블록(physical resource block, PRB)를 포함할 수 있다. 이 때, 시스템 제어 영역을 나타내기 위해 필요한 비트수는 17비트일 수 있다. As a method for indicating the system control area, information on the size of the system control area and information on the position of the system control area can be considered. The system control area may consider resource blocks that are logically or physically consecutively allocated. The base station can inform the terminal of the position of the system control area and the size of the system control area through the first system information. Hereinafter, the position of the system control area in the present disclosure may refer to a position where the system control area starts on the frequency axis, a final position on the frequency axis, or a position corresponding to the center on the frequency axis . The terminal can recognize in advance the frequency region through which the second system information is transmitted through the position of the system control region and the size of the system control region. In some embodiments, when the system bandwidth corresponds to N physical resource blocks (PRB), if the size of the system control area is one PRB, there are N possible positions of system resources, If the size of the region is K PRBs, the location of the system resources is possible (NK) (the PRBs are allocated contiguously). Therefore, the information for indicating the position of the system control area and the size of the system control area is,

Bit. For example, a cell operating a sub-carrier spacing (SCS) of 15 kHz and a system bandwidth of 100 MHz may include 500 physical resource blocks (PRBs). At this time, the number of bits required to represent the system control area may be 17 bits.

비트보다 적은 수의 비트 수 또는 시스템 대역폭 크기와 관계없이, 고정된 비트 수를 제공할 수 있다.On the other hand, since the first system information must be able to be received by all UEs in the cell through the broadcast channel, it is transmitted at a high coding rate, and accordingly, the number of bits may be reduced. Also, a change in the number of bits necessary for indicating the system control region according to the size (N) of the operating system bandwidth may increase implementation complexity in decoding the broadcast channel (e.g., PBCH). Therefore, in order to indicate the position of the system control area and the size of the system control area, the embodiments of the present disclosure will be described below.

It is possible to provide a fixed number of bits, regardless of the number of bits or the system bandwidth size.

Hereinafter, a specific configuration of first system information transmitted through a broadcast channel in a communication system supporting a wideband system bandwidth will be described with reference to FIG. 6 through FIG. 6 to 7, it is assumed that the subcarrier interval SCS is set to 15 kHz unless otherwise specified.

System information configuration - Initial access bandwidth and system control area

6 illustrates an example of a system control area according to various embodiments of the present disclosure.

Referring to FIG. 6, the system control area 650 may be displayed in a resource plane 600 that includes time-frequency resources. The vertical axis of the resource plane may represent a frequency domain. In one example, the resource plane 600 may be a resource grid and the horizontal axis may represent a time domain. Hereinafter, signals and information transmitted from the base station to the mobile station in the order of time are described using the resource plane 600.

The base station can set the system bandwidth 610. System bandwidth 610 refers to the channel bandwidth for communication within the coverage provided by the base station. For example, the system bandwidth 610 may be greater than 20 MHz. The system bandwidth 610 may be 100 MHz. The system bandwidth may be a bandwidth corresponding to 500 PRBs.

The base station may broadcast the SS block 630 to the terminal. For example, the base station may transmit the SS block 630 through the frequency resources corresponding to the six PRBs. The base station may transmit the synchronization signal 631 to the terminal. The synchronization signal 631 may include a PSS and an SSS. As the UE receives the synchronization signal 631, the UE can acquire synchronization between the cell ID provided by the base station and the base station. The base station may transmit the first system information 632 to the terminal. Here, the first system information may be referred to as MIB. The first system information may correspond to the MIB of the LTE communication system.

The terminal may acquire the first system information and obtain information on the initial access bandwidth 620. [ The terminal can acquire information on the location of the initial access bandwidth 620 and the size of the initial access bandwidth 620. For example, the location of the initial access bandwidth 620 may be indicated by an index (e.g., # 0 to # 499) for each of the total PRBs corresponding to the system bandwidth. The size of the initial access bandwidth 620 may be indicated by the number of PRBs (e.g., 500) equal to or less than the number of PRBs (e.g., 500) corresponding to the system bandwidth 610. The terminal can search the system control area on the resource area 640 corresponding to the initial access bandwidth 620 to obtain scheduling information for the second system information, or obtain random access messages described later.

The terminal may obtain the first system information and obtain information on the position of the system control area 650 and the size of the system control area 650. [ For example, the location of the system control area 650 may be indicated by an index for each of the PRBs (e.g., # 0 to # 99) corresponding to the initial access bandwidth 620. The size of the system control area 650 may be indicated by the number of PRBs (e.g., 100) equal to or less than the number of PRBs corresponding to the initial access bandwidth 620. From the location and size of the obtained system control area, the terminal can identify the system control area 650 on the resource plane 600.

The initial access bandwidth described above may be used to transmit the second system information and the random access messages (e.g., a random access response (RAR) message (message 2, msg 2), a contention resolution message (message 4, msg 4) May represent a frequency domain for indicating the range of resources to be transmitted. The initial access bandwidth may be a bandwidth defined by a value less than the maximum bandwidth that each of the terminals can support to support all of the terminals having different bandwidth capabilities. The value of the bandwidth may be a value less than the maximum bandwidth that each of the terminals can support so that all terminals in the cell can successfully receive the second system information and random access messages. The bandwidth may be referred to as a supportable minimum bandwidth. The bandwidth may be a bandwidth of a predefined size between the base station and the terminal. The bandwidth may be a minimum service bandwidth defined according to the usage of the terminal. The first system information may include information on the size of the initial access bandwidth and the location of the initial access bandwidth.

Since the bandwidth capabilities are different for each of the terminals, it is not required that all terminals recognize the PRB indexing corresponding to the overall system bandwidth. It is only necessary to inform the terminal supporting broadband bandwidth (for example, a bandwidth larger than 20 MHz) to PRB indexing corresponding to the entire system bandwidth. The terminals are required to transmit the capability of each terminal until the RRC connection with the base station, (E.g., UE capability), it can perform a connection with the base station using the initial access bandwidth that can receive the second system information and the random access messages (e.g., msg2 / msg4) before that.

In accordance with various embodiments of the present disclosure, by operating the initial access bandwidth rather than the total system bandwidth, the number of bits to be transferred can be reduced by reducing the number of cases for the system control region. On the other hand, the system control area is dependent on the initial access bandwidth. In the following description, the design of information for indicating the system control area according to whether the initial access bandwidth is fixed or variable is described.

When the initial access bandwidth is fixed

By fixing the initial access bandwidth, the number of bits required to indicate the system control area can be reduced. For example, if the system bandwidth corresponds to 500 PRBs at 100 MHz and the initial access bandwidth corresponds to 100 PRBs at 20 MHz, then the number of bits required to indicate the system control domain is the 17- bit to 13-bit.

이고, 시스템 제어 영역의 크기를 나타내는 비트 수 z₂는

일 수 있다. 이에 따라 가능한 경우의 수가 줄어듬으로써, 시스템 제어 영역을 나타내는 정보의 전체 비트 수 z(=z₁+z₂)는 감소된다. On the other hand, in order to further reduce the number of bits, a scheme for reducing the minimum bandwidth that can be supported by the terminal, that is, the initial bandwidth should be smaller than the initial access bandwidth, and the number of cases where the system control area can be allocated or the size of the system control area Can be considered. For example, if the bandwidth size supported by all UEs is 40 PRBs, the size of the frequency resource of the system control region is selected as one of 10 PRBs, 20 PRBs, 30 PRBs, 40 PRBs, and the size of the initial access bandwidth A case where the system control area is located in a PRB corresponding to a multiple of 5 of 100 PRBs can be considered. The position of the system control area is one of 21 cases considering 0, 5, 10, ..., 100, and the size of the system control area may be one of the above four values. Therefore, the number of bits z ₁ indicating the position of the system control area is

, And the number of bits z ₂ indicating the size of the system control area is

Lt; / RTI > Thus, by reducing the number of possible cases, the total number of bits z (= z ₁ + z ₂ ) of information indicating the system control area is reduced.

The initial access bandwidth is not fixed If not

The initial access bandwidth may not be fixed. In other words, the initial access bandwidth may be variable. As described above, if the number of usable PRBs to represent the system control area is different, the total number of bits indicating the position and size of the system control area may be different. Since this variability complicates the implementation of the terminal, the number of bits indicating the system control area may be required to be fixed irrespective of the initial access bandwidth.

일 수 있다. 시스템 제어 영역의 위치는, 초기 접속 대역폭의 X개의 PRB들 중에서 식별되는 Y개의 PRB들(이하, 위치 후보값들) 중 하나에 대응하는 PRB일 수 있다. The number of PRBs in the initial access bandwidth is X, and the number of cases for the position of the system control areas may be Y. [ Here, Y may be a fixed value. As an example, the number of bits z ₁ for the position of the system control areas may be a fixed value. That is, Y =

Lt; / RTI > The position of the system control area may be a PRB corresponding to one of the Y PRBs (hereinafter, position candidate values) identified among the X PRBs of the initial access bandwidth.

In some embodiments, the location of the system control area may be indicated using an interleaver. The base station transmits the PRB indexes of the 0th to the (X-1) th through the interleaved result values 0 to Y-1, The position candidate values for the system control region can be determined. The base station may transmit information indicating one of the Y result values to the terminal through the first system information. Depending on the above function, an extended design may be possible.

In some other embodiments, the location of the system control area may define a system resource index by equally spacing among the X PRB indices, which is the initial access bandwidth. The system resource index can be determined according to the following equation.

Here, the system resource index _n represents the nth system resource index among Y PRBs, X represents the number of PRBs, and Y represents the number of system control areas.

비트 또는 z₁=

일 수 있다. 상기 N은 시스템 대역폭에 대응하는 PRB들의 개수를 나타내거나, 초기 접속 대역폭이 운용되는 일부 실시 예들에서는 초기 접속 대역폭에 대응하는 PRB들의 개수를 나타낼 수 있다. In some other embodiments, the z ₁ value may be fixed through a parameter of a resource block group (RBG). The RBG may be a parameter for indicating P (P is a natural number) resource blocks as one index. To set the common search space (CSS) on the N PRBs on the bandwidth, the RBG value can be used. The RBG may be a value determined according to the N. [ For example, if the bandwidth is 5 MHz, the RBG may be one. For another example, if the bandwidth is 10 MHz, the RBG may be 2. By keeping N / RBG constant, the first system information can indicate the position of the system control area with a fixed number of bits (z ₁ ). The number of fixed bits is z ₁ =

Bit or z ₁ =

Lt; / RTI > The N may represent the number of PRBs corresponding to the system bandwidth or the number of PRBs corresponding to the initial access bandwidth in some embodiments where the initial access bandwidth is operating.

가지의 후보들 중에서 하나를 식별하여 시스템 제어 영역의 크기를 지시할 수 있다. the number of bits z ₂ indicating the number of cases of the size of the system control area can be fixed in the same manner as z ₁ . The first system information includes:

One of the candidates of the branch may be identified to indicate the size of the system control region.

FIG. 7 illustrates an example of first system information 700 in a wireless communication system according to various embodiments of the present disclosure.

7, the first system information 700 includes a field 710 (x-bit) indicating the location of the initial access bandwidth, a field 720 (y-bit) indicating the size of the initial access bandwidth, a location / size of the system control area And a field 730 (z-bit) indicating the field. The first system information 700 includes a field 710, a field 720, and a field 730 instead of a field indicating the system bandwidth and a PHICH (physical hybrid automatic repeat request (indicator) channel) setting field in the MIB in the existing LTE communication system can do. The first system information 700 may include a field indicating a system frame number (SFN) and other spare fields.

Although not shown in FIG. 7, in some embodiments, the first system information 700 may not be used if the initial access bandwidth is preset to a fixed location and size. That is, x and y may be zero.

The field 730 indicating the position / size of the system control area may be a z-bit. In some embodiments, field 730 may indicate the location and size of the system control area. The field 730 may include a value for identifying one of the combinations represented by (the position of the system control area, the size of the system control area). The number of combinations may be less than or equal to 2 ^z .

In some other embodiments, field 730 may include a field 731 (z ₁ -bit) indicating the location of the system control area and a field 732 (z ₂ -bit) indicating the size of the system control area.

,

, ...,

번째 PRB들 중 하나를 가리킬 수 있다. The field 731 may be a value determined according to a predefined rule. For example, the field 731 is fixed at z ₁ = 4 bits, and each of the 16 values represented by 4-bits is allocated from 0 to N of the N PRBs corresponding to the bandwidth (e.g., initial access bandwidth) on the resource grid

,

, ...,

Lt; th > PRBs.

Field 732 may be determined to be a value of one of the predefined candidate sets. For example, field 732 is fixed to z ₂ = 2-bit, and 00, 01, 10, and 11 represented by 2-bit are respectively 2, 3, 4, 8 PRBs, , And may represent one of 16 PRBs.

On the other hand, Fig. 7 is only an example of the first system information, and is not limited to the above-described configuration. For example, the first system information may not include information indicating SFN. In another example, the first system information may include PHICH information, such as MIB information of an existing LTE communication system. For another example, the first system information may not include extra bits.

System Information Configuration - Set bandwidth

In the communication system of the present disclosure, carrier aggregation (CA) can be performed through two or more narrow band component CCs. Through narrow-band CCs, a broadband CC can be supported. On the other hand, in a communication system that operates a wideband system bandwidth, a base station may be required to provide system information about a cell to both terminals supporting up to narrowband CC and terminals supporting up to wideband CC. 8A to 8D, a method for providing (for example, broadcasting) system information to all of the other terminals is described.

8A-8D illustrate examples of design of a system control area and second system information in a wireless communication system according to various embodiments of the present disclosure.

8A, the resource plane 810 includes an SS block, a system control region 815, a second system information 817, and a second system information 812 in a cell in which a wideband CC 811 is provided through a CA of a first narrow band CC 812 and a second narrow band CC 813. [ Represent the respective frequency regions. Here, the system control area 815 and / or the second system information 817 may be located within the initial access bandwidth in the resource plane 810.

The first system information may include information indicating an initial access bandwidth. As the system control area 815 and the second system information 817 are located within the initial access bandwidth, frequency hopping may not be performed.

The first system information may include numerology information, such as the inter-frequency (SCS) rate of the first narrow band CC 812 to which the SS block is connected in the resource plane 810. As an example, the numerical information may be 2-bit. The numerical information may be '00', '01', '10', '11' may be 15 kHz, '30 kHz', '60 kHz', or '120 kHz', respectively.

In the embodiment shown in FIG. 8A, the system control area 815 may not be limited to the bandwidth of the SS block. The second system information 817 may not be limited to the bandwidth of the SS block.

In some embodiments, a terminal supporting the wideband CC 811 or the first narrowband CC 812 may reset the operating bandwidth to a different bandwidth, in addition to the initial access bandwidth, to transmit and receive data after the RRC connection.

8B, the resource plane 820 includes an SS block, a system control region 825, a second system information 827, and a second system information 822 in a cell in which a wideband CC 821 is provided through a CA of a first narrow band CC 822 and a second narrow band CC 823 Represent the respective frequency regions. Here, the system control area 825 and / or the second system information 827 may be located within the wideband CC 821 at the resource plane 820.

The first system information may include information indicating the size of the system bandwidth. The system bandwidth may be the bandwidth located within the wideband CC 821. [ The first system information may include numerology information (e.g., SCS of 15 kHz or 30 kHz) operating in the resource plane 820. Specifically, the first system information may include numerical information on the CC provided in the system control area 825 and the second system information 827. [ In addition, the first system information may include information on the position of the bandwidth occupied by each numerical information or the size of the bandwidth occupied.

In the embodiment shown in FIG. 8B, the system control area 825 may not be limited to the bandwidth of the SS block. The second system information 827 may not be limited to the bandwidth of the SS block.

In some embodiments, the terminal supporting the narrowband CC (the terminal with the maximum supportable bandwidth in the narrowband CC, e.g., first narrowband CC 822) is configured to receive information about system control area 825 and second system information 827 Can be received. At this time, frequency hopping may be performed in order to receive information on the system control region 825 and the second system information 827 in which a terminal supporting narrowband CC is spread on a wideband CC.

8c, the resource plane 830 includes an SS block, a system control region 835, a second system information 837, and a second system information 836 in a cell where a wideband CC 831 is provided through a CA of a first narrow band CC 832 and a second narrow band CC 833. [ Represent the respective frequency regions. Here, the system control area 835 and / or the second system information 837 may be located in the first narrow band CC 831 at the resource plane 830.

The first system information may include information on the first narrow band CC 832 where the bandwidth at which the SS block is transmitted is located. The information for the first narrow band CC 832 may include the location of the first narrow band CC 832 (e.g., location on the resource grid frequency axis) and the size of the first narrow band CC 832, or the numerical information of the first narrow band CC 832 . ≪ / RTI >

In the embodiment shown in FIG. 8C, the system control area 835 may not be limited to the bandwidth of the SS block. The second system information 837 may not be limited to the bandwidth of the SS block.

In some embodiments, the terminal supporting the narrowband CC (the terminal with the maximum supportable bandwidth within the narrowband CC, e.g., first narrowband CC 822) is configured with information about system control area 835 and second system information 837 Can be received. At this time, a terminal supporting a bandwidth lower than that of the narrowband CC can perform frequency hopping in order to receive information on the system control region 835 spread over the narrowband CC and the second system information 837.

In some embodiments, a terminal supporting wideband CC 831 may reset the operating bandwidth to another bandwidth to transmit and receive data after the RRC connection.

8D, the resource plane 840 includes the SS block 844, the system control area 845, the second system information 845, and the second system information 840 in the cell where the wideband CC 841 is provided through the CAs of the first narrowband CC 842 and the second narrowband CC 843, 847, respectively. Here, the system control area 845 and / or the second system information 847 may be located within the transmitted bandwidth 846 of the SS block 844.

The first system information may include numerical information for the first narrowband CC 842, where the bandwidth 846 in which the SS block is transmitted is located.

8D, the system control area 825 may be limited to the bandwidth 846 of the SS block 844. The second system information 827 may be limited to the bandwidth 846 of the SS block 844.

In some embodiments, a terminal that supports wideband CC 841 or first narrowband 842 (or second narrowband 843) may reset the operating bandwidth to another bandwidth, in addition to bandwidth 846, to transmit and receive data after the RRC connection .

Reference signal Sequence of  Design of reference signal sequence

When operating the initial access bandwidth, the number of bits for the position and size information of the system control area in the first system information can be reduced (e.g., 17 bits to 13 bits).

The reference signal (e.g., DM (demodulation) -RS (reference signal)) sequence is a function of the index (e.g. PRB index) determined based on the number of PRBs corresponding to the bandwidth, Lt; / RTI > For the connection procedure with the terminal in this disclosure, two RS sequences can be generated in the same frequency domain (sub-carrier), with more than two operating bandwidths. That is, the first RS sequence obtained from the first index based on the initial access bandwidth can be determined, and the second RS sequence obtained from the second index based on the system bandwidth can be determined. When two RS sequences are determined, conflicts occur between RS sequences, and mutual sharing is impossible. Therefore, it may be required to solve this problem. Hereinafter, through FIG. 9, three schemes are proposed.

9 illustrates an example of a first system information and reference signal sequence in a wireless communication system according to various embodiments of the present disclosure. 9, the first embodiment, the second embodiment, and the third embodiment are described through the resource plane 910, the resource plane 920, and the resource plane 930, respectively.

First Embodiment

On resource plane 910, the reference signal sequence may be generated without considering system bandwidth or initial access bandwidth. Instead, the first system information may include an offset value between a first index of the initial access bandwidth and a second index of the system bandwidth. In some embodiments, the first system information may further include an offset field indicating the offset value. In some other embodiments, the first system information may utilize an extra field to indicate the offset value.

The offset value may be indicated by the number of PRBs indicating the difference between the position of the system bandwidth and the position of the initial access bandwidth. The terminals performing the initial connection can correctly obtain the RS sequence by receiving the first system information. For example, on the resource plane 910, the base station may broadcast the first system information including an offset value indicating '5' to the terminal.

Second Embodiment

On resource plane 920, a reference signal sequence may be generated for each particular PRB count. The reference signal sequence may be continuously generated for each specific number of PRBs. The reference signal sequence may be repeatedly generated for each specific PRB number. Instead, the first system information may explicitly indicate the index of the PRB used in the first reference signal sequence at a particular location. The indicated index may be referred to as an offset value. In some embodiments, the offset value may be one of the predefined offset candidate values. That is, the reference signal sequence may indicate one of the predefined offset candidate values.

In the second embodiment, the offset value is transmitted as in the first embodiment, but the size of the information to be transmitted can be reduced by carrying out a modulo operation on the offset value as the length of the sequence of the reference signal . According to the second embodiment, the offset value can be calculated according to the following equation (2).

는 시스템 대역폭의 PRB 번호이고,

는 초기 접속 대역폭의 PRB 번호를 가리킨다. M은 기준 신호 시퀀스의 길이로, PRB 단위일 수 있다. Here, Offset index represents an offset value,

Is the PRB number of the system bandwidth,

Indicates the PRB number of the initial access bandwidth. M is the length of the reference signal sequence, and may be in PRB units.

By generating a reference signal sequence through an iterative operation, the number of possible cases with an offset value can be reduced by the length of the reference signal sequence. For example, as in the second embodiment, when the length of the reference signal sequence is 6, the maximum value of the offset value may be 6. As an example, the offset value may be 3 bits.

Third Embodiment

On the resource plane 930, the reference signal sequence may be generated continuously for a specific number of PRBs. The reference signal sequence may be repeatedly generated for each specific PRB number. Instead, the PRB position of the initial access bandwidth and the index of the PRB used for the n-th reference signal sequence (where n is a natural number equal to or smaller than M and M is the specific PRB number or reference signal sequence length) , The initial access bandwidth can be set. Here, n may be predefined between the BS and the MS. For example, the third embodiment can allocate an initial access bandwidth (n = 1) so that the start PRB position of the initial access bandwidth and the start point of the reference signal sequence coincide. Unlike the first embodiment or the second embodiment, the RS sequence can be shared without assignment of offsets in the first system information. Without sending additional information, the reference signal sequence can be shared.

All terminals to be connected to the cell in the above manner can receive the first system information (MIB), the system control domain (CORESET), and the second system information (RMSI) information. The terminal can access the cell through a random access procedure with the base station. All the connected terminals can report the bandwidth capability to the base station. The base station informs a new index (eg, a PRB index) to be used for data transmission (eg, PDCCH / physical downlink shared channel (PDSCH) transmission) considering the bandwidth capability of each terminal.

Hereinafter, a new bandwidth allocation to be used for data transmission (e.g., PDCCH / PDSCH transmission), that is, a bandwidth reset procedure for a new PRB indexing will be described with reference to FIG.

Bandwidth reconfiguration

10 illustrates an example of a bandwidth reconfiguration procedure between a base station (base station 110) and a terminal (e.g., a first terminal 120) that has received system information in a wireless communication system according to various embodiments of the present disclosure. Hereinafter, the operations of FIG. 10 may be the operation after Step 405 of FIG. 4 or the operation after Step 505 of FIG. 5 described above, or may be an overlapping operation. In other words, the operations of FIG. 10 may be performed after the random access procedure is completed and the RRC connection is set up or the RRC connection is being set up.

A terminal set as an initial access bandwidth can be reset to a maximum bandwidth that the terminal can support to transmit and receive data. The signaling operations to be described later with reference to FIG. 10 may be performed through parameters in the RRC message or via a medium access control (CE) control element (CE).

Referring to FIG. 10, in step 1001, the terminal can report the bandwidth capability to the base station. In some embodiments, the terminal may send a completion message to inform the base station that the RRC connection is set up, and the completion message may include UE capability information. The terminal capability information may include information on a maximum bandwidth that the terminal can support. In some other embodiments, the terminal may request a reconfiguration of the bandwidth via the MAC CE. For example, the MS may request the BS to reset the bandwidth by causing the logical channel identity (LCID) in the MAC CE transmitted on the uplink to instruct the bandwidth reestablishment.

In step 1003, the BS may transmit a request message for requesting bandwidth reset to the MS. In some embodiments, the base station may utilize the parameters used when reconfiguring the RRC connection to transmit the request message. For example, the base station may include an information element (IE) indicating bandwidth reconfiguration in an RRC connection reconfiguration message to transmit the RRC connection re-establishment message to the UE. The IE can indicate a settable bandwidth according to the bandwidth capability of the terminal. In some other embodiments, the base station may indicate that the LCID in the MAC CE transmitted on the downlink indicates a bandwidth reset and the MAC control information indicates the configurable bandwidth.

In step 1005, the base station can transmit a completion message indicating completion of bandwidth reset to the terminal. In some embodiments, the terminal may transmit the completion message utilizing the parameters used when reestablishing the RRC connection. For example, the UE can inform the base station of the completion of the bandwidth reset through an RRC connection reconfiguration complete message.

In step 1007, the BS and the MS can transmit and receive data. The base station may transmit the downlink data to the terminal or receive the uplink data from the terminal on the re-established bandwidth. The terminal may receive the downlink data from the base station or transmit the uplink data to the terminal on the reconfigured bandwidth. The downlink data may be transmitted on the PDSCH. The uplink data may be transmitted on a physical uplink shared channel (PUSCH).

As described above, through the bandwidth reset procedure, forward compatibility due to bandwidth expansion and spectral utilization increase in the system in which the base station is operating can be supported.

On the other hand, although the present disclosure has been described on the basis of a broadband operating communication system, it can also be applied for initial connection between terminals with different bandwidth capabilities within 20 MHz. For example, the first system information can be utilized as system information for connection of a low power terminal having a maximum supportable bandwidth of 1.4 MHz.

In the present disclosure, the first system information is created as information for performing the same or similar function as the MIB of the LTE communication system, but is not limited thereto.

In the present disclosure, the system control area is formed of information for performing the same or similar function as the PDCCH including the control information for the SIB transmitted on the PDSCH of the LTE communication system, but is not limited thereto.

In the present disclosure, the second system information is created in a similar meaning to the SIB (e.g., SIB1 or SIB2) of the LTE communication system, but is not limited thereto.

Methods according to the claims of the present disclosure or the embodiments described in the specification may be implemented in hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored on a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods in accordance with the embodiments of the present disclosure or the claims of the present disclosure.

Such programs (software modules, software) may be stored in a computer readable medium such as a random access memory, a non-volatile memory including flash memory, a read only memory (ROM), an electrically erasable programmable ROM but are not limited to, electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs An optical storage device, or a magnetic cassette. Or a combination of some or all of these. In addition, a plurality of constituent memories may be included.

The program may also be stored on a communication network, such as the Internet, an Intranet, a local area network (LAN), a wide area network (WAN), a communication network such as a storage area network (SAN) And can be stored in an attachable storage device that can be accessed. Such a storage device may be connected to an apparatus performing an embodiment of the present disclosure via an external port. Further, a separate storage device on the communication network may be connected to an apparatus performing the embodiments of the present disclosure.

In the specific embodiments of the present disclosure described above, the elements included in the disclosure have been expressed singular or plural, in accordance with the specific embodiments shown. It should be understood, however, that the singular or plural representations are selected appropriately according to the situations presented for the convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, And may be composed of a plurality of elements even if they are expressed.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present disclosure should not be limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (24)

In a wireless communication system, in an apparatus of a base station,
At least one transceiver,
At least one processor operatively coupled to the at least one transceiver,
Wherein the at least one processor comprises:
Transmits the first system information through a broadcast channel,
Transmitting second system information through a resource area indicated by the first system information,
And to perform a radio resource control (RRC) connection with the terminal that has received the first system information and the second system information.
The method according to claim 1,
Wherein the resource area indicated by the first system information is a specific bandwidth,
Wherein the specific bandwidth is narrower than or equal to a bandwidth that the terminal can support.
The apparatus of claim 2, wherein the resource area indicated by the first system information is a control region indicating scheduling information for the second system information.
The method of claim 3,
Wherein the first system information includes information on a size of the control area on a frequency and information on a specific location of the control area,
Wherein the size of the control area is smaller than the size of the specific bandwidth.
The method of claim 4,
The first system information is a master information block (MIB)
And the second system information is a system information block (SIB).
5. The apparatus of claim 4, wherein the at least one processor comprises:
From the terminal, a report on a bandwidth capability indicating a bandwidth that the terminal can support,
Performs bandwidth reconfiguration on the terminal and the bandwidth,
And transmit and receive data based on the bandwidth to the terminal.
In a wireless communication system, in a method of operating a base station,
Transmitting first system information through a broadcast channel,
Transmitting second system information through a resource area indicated by the first system information;
And performing a radio resource control (RRC) connection with the terminal that has received the first system information and the second system information.
The method of claim 7,
Wherein the resource area indicated by the first system information is a specific bandwidth,
Wherein the specific bandwidth is narrower than or equal to the bandwidth supported by the terminal.
The method of claim 8, wherein the resource region indicated by the first system information is a control region indicating scheduling information for the second system information.
The method of claim 9,
Wherein the first system information includes information on a size of the control area on a frequency and information on a specific location of the control area,
Wherein the size of the control area is smaller than the size of the specific bandwidth.
The method of claim 10,
The first system information is a master information block (MIB)
Wherein the second system information is a system information block (SIB).
The method of claim 10,
Receiving from the terminal a report on a bandwidth capability indicating a bandwidth that the terminal can support;
Performing bandwidth reconfiguration on the terminal and the bandwidth;
And transmitting and receiving data based on the bandwidth to the terminal.
In a wireless communication system, in an apparatus of a terminal,
At least one transceiver,
At least one processor operatively coupled to the at least one transceiver,
Wherein the at least one processor comprises:
Receiving first system information from a base station,
Receiving second system information through a resource area indicated by the first system information,
And perform a radio resource control (RRC) connection with the base station based on the first system information and the second system information.
14. The method of claim 13,
Wherein the resource area indicated by the first system information is a specific bandwidth,
Wherein the specific bandwidth is narrower than or equal to a bandwidth that the terminal can support.
15. The apparatus of claim 14, wherein the resource area indicated by the first system information is a control region indicating scheduling information for the second system information.
16. The method of claim 15,
Wherein the first system information includes information on a size of the control area on a frequency and information on a specific location of the control area,
Wherein the size of the control area is smaller than the size of the specific bandwidth.
18. The method of claim 16,
The first system information is a master information block (MIB)
And the second system information is a system information block (SIB).
17. The system of claim 16,
Transmits to the BS a report on a bandwidth capability indicating a bandwidth that can be supported by the MS,
Performing a bandwidth reconfiguration on the base station and the bandwidth,
And transmit and receive data based on the bandwidth to the base station.
A method of operating a terminal in a wireless communication system,
Receiving first system information from a base station;
Receiving second system information through a resource area indicated by the first system information;
And performing a radio resource control (RRC) connection with the base station based on the first system information and the second system information.
The method of claim 19,
Wherein the resource area indicated by the first system information is a specific bandwidth,
Wherein the specific bandwidth is narrower than or equal to the bandwidth supported by the terminal.
The method of claim 20, wherein the resource area indicated by the first system information is a control region indicating scheduling information for the second system information.
23. The method of claim 21,
Wherein the first system information includes information on a size of the control area on a frequency and information on a specific location of the control area,
Wherein the size of the control area is smaller than the size of the specific bandwidth.
23. The method of claim 22,
The first system information is a master information block (MIB)
Wherein the second system information is a system information block (SIB).
23. The method of claim 22,
Transmitting, to the base station, a report on a bandwidth capability indicating a bandwidth supported by the terminal;
Performing bandwidth reconfiguration on the bandwidth and the base station;
And transmitting and receiving data based on the bandwidth to the base station.

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