KR101884978B1 - Methods for trnasmitting/receiving system information repeatedly and apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting system information for a MTC terminal, and more particularly, to a method and apparatus for frequency hopping of system information for a MTC terminal. The base station determines an index of a narrow band to which the system information is first transmitted based on the physical cell ID and the number of narrow bands according to the system bandwidth, and determines the index of the first narrow band, narrow band And the number of narrow bands used for frequency hopping. According to the present invention, system information can be transmitted or repeatedly transmitted to an MTC terminal without causing interference at adjacent base stations.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for repeatedly transmitting / receiving system information,

The present invention relates to a method and apparatus for transmitting system information for an MTC terminal. More specifically, the present invention relates to a method and apparatus for setting transmission resources of system information for a MTC terminal and performing frequency hopping.

Machine Type Communication (MTC) is defined as communication between a device and an object without human intervention. From the 3GPP perspective, 'machine' means an entity that does not require direct manipulation or intervention by a person, and 'MTC' is defined as a form of data communication involving one or more of these machines.

A typical example of a machine is a smart meter equipped with a mobile communication module, a vending machine, etc. Recently, however, depending on a user's location or situation, A mobile terminal having an MTC function is considered as a form of a machine.

In order to support the MTC terminal with extended coverage, system information (SI, System Information) must be repeatedly transmitted in a plurality of subframes in the time domain. When system information SI is repeatedly transmitted in most downlink subframes for a UE with a coverage extended every transmission period, resources for PDSCH transmission for DTCH (Dedicated Traffic CHannel) transmission are relatively insufficient. In order to solve this problem, an intermittent repetitive transmission method has been proposed in which system information (SI) is repeatedly transmitted only for a specific subframe or a specific transmission period.

Therefore, it is required to design a frequency hopping pattern that makes it possible to repeatedly transmit system information (SI) to the MTC terminal while preventing interference with system information (SI) transmitted from a neighboring base station.

The present invention, which is devised in accordance with the above-described needs, provides a method and apparatus for setting transmission resources for transmission of system information for an MTC terminal and transmitting and receiving system information using the transmission resources.

Also, a method and an apparatus capable of repeatedly transmitting / receiving system information for an MTC terminal by configuring a frequency hopping pattern for system information transmission for the MTC terminal are provided.

According to an aspect of the present invention, there is provided a method for repeatedly transmitting system information by a base station, the method comprising the steps of: generating a first hopping signal that configures a frequency hopping pattern based on a physical cell ID and a number of narrow bands according to a system bandwidth; Determining an index of the remaining narrow band that constitutes the frequency hopping pattern based on the physical cell ID, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping And repeatedly transmitting the system information through a narrow band corresponding to the index of the narrow band constituting the frequency hopping pattern.

The present invention also relates to a method of repeatedly receiving system information by a terminal, comprising the steps of: firstly receiving system information through a narrow band of an index determined based on a physical cell ID and a number of narrow bands according to a system bandwidth And receiving system information via a narrow band of indices determined based on the physical cell ID, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping .

According to another aspect of the present invention, there is provided a base station that repeatedly transmits system information. The base station determines the index of the first narrow band constituting the frequency hopping pattern based on the physical cell ID and the number of narrow bands according to the system bandwidth, A control section for determining an index of the remaining narrow band that constitutes the frequency hopping pattern based on the ID, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping, And a transmitter for transmitting system information through a narrow band corresponding to an index of the low band.

The present invention also provides a base station that repeatedly receives system information, comprising: first receiving system information through a narrow band of an index determined based on a physical cell ID and a number of narrow bands according to a system bandwidth; Wherein the system information is received through a narrow band of the determined index based on the ID, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping.

According to the present invention, a transmission resource for system information transmission for the MTC terminal is set, and system information can be transmitted / received using the transmission resource.

Further, by providing a frequency hopping method for repeated transmission of system information to a coverage extended MTC terminal, neighboring base stations can repeatedly transmit system information using different resources to subframes repeatedly transmitted by frequency hopping Lt; / RTI >

1 is a diagram illustrating an initial cell access procedure of a UE.
2 shows the configuration of the MIB.
3 is a diagram illustrating an example of a PDCCH coding method.
Figure 4 shows the resources through which the PBCH is transmitted.
5 is a diagram for explaining system information time domain scheduling.
6 is a diagram for describing a change of system information.
7 is a flowchart of a method of repeatedly transmitting system information by a base station according to an embodiment of the present invention.
8 is a flowchart of a method in which a terminal repeatedly receives system information according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a configuration of a base station according to another embodiment.
10 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, 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.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like.

1 is a diagram illustrating an initial cell access procedure of a UE.

1, a wireless communication system includes an uplink (e.g., a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical uplink control channel) with a user equipment (PDSCH), a Physical Downlink Control Channel (PDCCH), an Enhanced Physical Downlink Control Channel (EPDCCH), a Physical HARQ Information CHannel (PHICH), and the like. , A Physical Control Format Information Channel (PCFICH), a Physical Broadcast CHannel (PBCH), and the like).

In this specification, the terminal 10 is a comprehensive concept of a terminal in a wireless communication. The terminal 10 may be a mobile station (MS), a user terminal (UT) in GSM as well as a UE (User Equipment) in WCDMA, LTE, HSPA, , A subscriber station (SS), a wireless device, and the like.

The base station 20 or the cell is generally a station that communicates with the terminal 10 and includes a Node-B, an evolved Node-B (eNodeB), a sector, ), A base transceiver system (BTS), an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

In addition, the base station 20 should be interpreted in a generic sense to denote some areas or functions covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) , Macrocell, microcell, picocell, femtocell, radio resource head (RRH), and relay node communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. Macro cell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) the wireless region itself. I) instructs all of the devices that are controlled by the same entity to provide a given wireless region or interact to configure the wireless region as a collaboration. An RN, an RN, an RN, an RN, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like according to a configuration method of a wireless region. Ii) may indicate to the base station the wireless region itself to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in the present specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), and an Enhanced Physical Downlink Control Channel (EPDCCH) ), A PUSCH (Physical Uplink Shared CHannel), and the like, and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having coverage of a signal transmitted from a transmission / reception point or coverage of a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a Coordinated Multi-point Transmission / Reception System (CoMP system) or Coordinated Multi-point Transmission / Reception (CoMP) system in which two or more transmitting / receiving points cooperatively transmit signals, an antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter, referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, the description that the PDCCH is transmitted or received or the signal is received and transmitted through the PDCCH may be used to mean transmitting or receiving the EPDCCH or transmitting or receiving the signal through the EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

For convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH, and the PDCCH, which is an embodiment of the present invention, may be applied to the portion described with the EPDCCH.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The base station 20 performs downlink transmission to the terminals. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

The base station 20 may be referred to as a Transmission Point (TP) in terms of transmitting downlink communication to the terminal 10 and may be referred to as a Reception Point , RP), or may be referred to as a Point or a Transmission and Reception Point.

Machine Type Communication (MTC) is defined as communication between a device and an object without human intervention. From the 3GPP perspective, 'machine' means an entity that does not require direct manipulation or intervention by a person, and 'MTC' is defined as a form of data communication involving one or more of these machines. A typical example of a machine is a smart meter equipped with a mobile communication module, a vending machine, etc. Recently, however, depending on a user's location or situation, A mobile terminal having an MTC function is considered as a form of a machine.

As the LTE network spreads, mobile operators want to minimize the number of Radio Access Terminals (RATs) to reduce network maintenance costs. However, conventional MTC products based on a GSM / GPRS network are increasing, and MTC using a low data rate can be provided at low cost. Therefore, there is a problem in that two RATs must be operated respectively, since LTE network is used for general data transmission and GSM / GPRS network is used for MTC. Therefore, Of the total revenue.

In order to solve this problem, it is necessary to replace a cheap MTC terminal using a GSM / EGPRS network with an MTC terminal using an LTE network, and various requirements for lowering the price of the LTE MTC terminal are required for the 3GPP RAN WG1 standard conference . In addition, the standard meeting is preparing a document (TR 36.888) describing various functions that can be provided to satisfy the above requirements.

In order to support low-cost LTE MTC terminals, the major items related to physical layer specification change, which are currently being discussed in 3GPP, include technologies such as narrowband support, Single RF chain, Half duplex FDD and Long DRX (Discontinued Reception). However, the above methods, which are considered for lowering the price, can reduce the performance of the MTC terminal as compared with the conventional LTE terminal.

In addition, about 20% of MTC terminals supporting MTC services such as smart metering are installed in a 'Deep indoor' environment such as a basement, so that for successful MTC data transmission, Compared with the coverage of the mobile station.

Table 1 below shows the link budget of each physical channel as MCL (Maximum Coupling Loss) value. Since the MCL value of FDD PUSCH is the smallest, the target MCL value for improving 15 [dB] is 140.7 + 15 = 155.7 [dB].

Table 2 below shows the degree of coverage improvement for each physical channel required to satisfy the target MCL value.

Various methods for robust transmission such as PSD boosting or low coding rate and time domain repetition are considered for each physical channel in order to improve the coverage while lowering the LTE MTC terminal price.

The requirements of low-cost MTC terminal based on LTE are as follows.

- The data transmission rate shall satisfy the data transmission rate provided by the minimum EGPRS based MTC terminal, that is 118.4kbps downlink and 59.2kbps uplink.

- Frequency efficiency should be improved dramatically compared to GSM / EGPRS MTC terminal.

- The service area provided shall not be less than that provided by the GSM / EGPRS MTC terminal.

- Power consumption should not be higher than GSM / EGPRS MTC terminal.

- Legacy LTE terminals and LTE MTC terminals should be available at the same frequency.

- Reuse existing LTE / SAE networks.

- Optimization is performed not only in FDD mode but also in TDD mode.

- Low-cost LTE MTC terminals should support limited mobility and low power consumption modules.

The base station can allocate only a maximum of six PRB pairs (PRB pairs) in one subframe to the MTC terminal, and the maximum usable transport block size (TBS) is 1000 bits.

Referring to FIG. 1, in the initial cell access procedure of the UE, the UE 10 receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), which are synchronization signals transmitted from the Node B 20 (S 102). In the LTE FDD (Frequency Division Duplex), the PSS can be transmitted in the last symbol (#n) of the first slot of the subframe # 0 and the subframe # 5 in one radio frame (10 ms) May be transmitted in the previous symbol (# n-1) of the last symbol (#n) of the first slot of frame # 5. In LTE TDD, the PSS / SSS can be transmitted at a different location than the FDD.

And acquires a frame timing and a cell group ID sequence by acquiring SSS (Secondary Sync Signal) scrambling code and SSS (Secondary Sync Signal) scrambling code by PSS acquisition (Primary Sync Signal Acquisition).

When the terminal 10 detects the PSS and the SSS, it can acquire the cell ID and the downlink synchronization information, and can obtain a cell-specific reference signal (CRS) based on the information obtained based on the PSS / ) To perform additional synchronization and conventional control channel decoding.

The terminal 10 receives the signal from the base station 20 through the PBCH based on the CRS (S104), and extracts the MIB (master information block) transmitted through the PBCH (S106). As described below with reference to FIG. 2, the MIB may include information indicating a bandwidth of a cell, information indicating a PHICH configuration, and information indicating a system frame number. The terminal 10 can know the resource to which the PDCCH is allocated based on the information included in the MIB.

The terminal 10 receives a signal from the base station 20 via the PDCCH based on the CRS (S108), and extracts downlink control information (DCI) transmitted through the PDCCH (S110). The DCI may be control information for a PDSCH to which a system information block (SIB) is transmitted, and may be transmitted through a common search space. In other words, it decodes the PCFICH and detects how many symbols are allocated for the PDCCH. And decodes the DCI for SIB1 from this PDCCH. Decodes SIB1 and obtains time domain scheduling information for the other SIBs.

Based on the DCI, the UE 10 receives a signal via a PDSCH based on a downlink RS (DL) from the base station (S112), and extracts another SIB transmitted through the PDSCH (S114). And decodes DCIs for SIBs other than SIB1 from the PDCCH. Decode other SIBs.

Thereafter, the terminal 10 and the base station 20 perform a random access procedure (S116), and the terminal 10 can enter the RRC connected state from the RRC idle state.

System information transmitted by the base station 20 on the PBCH is called a master information block (MIB).

2 shows the configuration of the MIB.

Referring to FIG. 2, the MIB may include a 'dl-Bandwidth' field, a 'phich-Config' field, a 'systemFrameNumber' field, and a 'spare' field.

The 'dl-Bandwidth' field can be used to indicate the bandwidth of a cell in resource block (RB) units. In the LTE and LTE-A systems, one cell may be composed of 6, 15, 25, 50, 75, or 100 RBs, and a 3-bit 'dl-Bandwidth' field indicates one of these values. Lt; / RTI >

The 'phich-Config' field can be used to indicate a PHICH resource to which A / N (Acknowledgment / Negative Acknowledgment) to the PUSCH is transmitted. The 'phich-Config' field is composed of 3 bits, and may include one bit for indicating the PHICH duration and two bits for indicating the PHICH resource. The PHICH duration may indicate the number of OFDM symbols to which the PHICH is allocated. If the value of the PHICH duration is 0 (Normal), the PHICH may be located in the first OFDM symbol of the subframe, 1, the PHICH may be located in the first two or three OFDM symbols of the subframe. The PHICH resource can indicate the resource occupancy of the PHICH and can indicate a value of 1/6, 1/2, 1, or 2.

The 'systemFrameNumber' field can be used to indicate a system frame number (SFN) of 10 bits. Here, the SFN has a value of 0 to 1023, and the SFN has a repetition value ranging from 0 to 1023 with a frame period of 1024. Eight bits out of the 10 bits of the system frame number are indicated through the 'systemFrameNumber' field, and 2 bits can be obtained implicitly in the decoding of the PBCH which is a period of four radio frames (40 ms). Thus, the 'systemFrameNumber' field may include 8 bits from the Most Significant Bit (MSB) of the system frame number.

A 10 bit 'spare' field is reserved.

The MIB is composed of 24 bits in total. 1 for the PBCH transmission including the MIB.

3 is a diagram illustrating an example of a PDCCH coding method.

Referring to FIG. 3, a CRC (Cyclic Redundancy Check) of 16 bits is generated using MIB 24 bits (a ₀ , a ₁ , ... a _{A - 1} ). At this time, a 16-bit CRC mask set according to the number of transmission antennas is scrambled in the generated 16-bit CRC. A 16-bit scrambled CRC is added after the 24-bit MIB to generate a total of 40-bit information bit blocks (i ₀ , i ₁ , ..., i _K-1 ) (S310).

The information bits of 40 bits are encoded using TBCC (Tail Biting Convolutional Code) (S320).

,

, ... ,

)의 길이는 120 비트이다. 모부호는 레이트 매칭(Rate Matching) 과정을 거쳐 1920 비트의 부호어(e₀,e₁,...,e_E-1)로 반복(repetition)된다(S330).TBCC encoded mother code (

,

, ...,

) Is 120 bits in length. The mother code is subjected to a rate matching process and repetition is performed with 1920 bits of codeword e ₀ , e ₁ , ..., e _E-1 at step S330.

Figure 4 shows the resources through which the PBCH is transmitted.

Referring to FIG. 4, the PBCH may be located in the first subframe of each frame on the time axis and in six resource blocks (RB) or 72 subcarriers on the frequency axis. The 1920-bit codeword is transmitted in four frames of 480 bits in the first subframe of each frame. Therefore, the MIB transmitted to the PBCH is changed when the SFN (System Frame Number) is SFN mod 4 = 0, and is transmitted using only the subframe number 0 (SF # 0) for each frame. Also, OFDM symbol index i (i = 0,1,2, ..., 13) among 14 OFDM symbols of SF # 0 is transmitted using only four OFDM symbols of 7, 8, 9,

The transmitted 480-bit codeword is composed of a decodable codeword. The UE can combine and decode the received values of the codeword transmitted within the period of the PBCH codeword transmitted in four frame periods.

Therefore, if the channel condition between the base station and the terminal is good, the decoding can be successfully performed using the reception values of the codewords transmitted in one frame. Otherwise, the reception values of the codewords transmitted in the maximum 4 frames must be combined The probability of successful decoding increases.

In addition to the MIB transmitted to the PBCH, another system information transmitted by the base station on the PDSCH is called a system information block (SIB). There are various SIB types according to the type of information to be transmitted as shown in Table 3 below.

SIB SIB type description SIB1 System Information Block Type 1 (SIB1), which contains the parameters needed for cell selection, as well as information about the timedomainscheduling of the other SIBs. SIB2 System Information Block Type 2 (SIB2), which includes common and shared channel information. SIB3-SIB8 SIB3-SIB8, which includes parameters used to control intra-frequency, inter-frequency and inter-RAT cell reselection. SIB9 SIB9, which is used to signal the name of a Home eNodeB (HeNBs). SIB10-SIB12 SIB10-SIB12, which includes the Earthquake and Tsunami Warning Service (ETWS) notifications and Commercial Mobile Alert System (CMAS) warning messages SIB13 SIB13, which includes MBMS related control information SIB14 SIB14, which contains Extended Access Barring related information. SIB15 SIB 15, which contains the MBMS Service Area Identities (SAI) of the current and / or neighboring carrier frequencies. SIB16 SIB16, which contains information related to GPS time and Coordinated Universal Time (UTC).

Of the 16 types of SIBs described above, SIB1 uses fixed time domain scheduling similar to MIB. First, the transmission period of one SIB1 is eight frames (80ms), and is transmitted over four frames, which are SFN mod2 = 0. Only SF # 5 is used for SIB1 transmission in the frame in which SIB1 is transmitted. Also, the UE decodes the DCI of the PDCCH transmitted to the SF # 5 by obtaining the frequency domain scheduling information to which the SIB1 is transmitted. The terminal blind-decodes the DCI using the SI-RNTI.

Next, a scheduling method of SIBs (SIB2 to SIB16) other than SIB1 will be described. The time domain scheduling information of the other SIBs is transmitted to the UE through SIB1.

When the terminal 10 acquires the SI message, the terminal determines the start of the SI window for the SI messages associated therewith. The number n corresponding to the order of the entry in the list of SI messages organized by the schedulingInfoList in SystemInformationBlockType1 for the associated SI message and determines the integer value x = (n - 1) * w. Where w is the window length ( si - WindowLength ).

The SI window starts at subframe #a of the radio frame with SFN mod T = FLOOR (x / 10). At this time, a = x mod 10, and T is the period (si -Periodicity) of the associated SI message.

At this time, an SI window of 1 ms is set only when all SIs are scheduled before sub-frame # 5 in a frame with SFN mod 2 = 0.

The PDSCH is received using the SI-RNTI from the starting point of the SI window and continues until the end of the SI window whose absolute time length is si-WindowLength or until the SI message is received. However, in the frame with SFN mod 2 = 0, subframe # 5, all MBSFN subframes, and all uplink subframes in TDD are excluded.

If the SI message is not received until the end of the SI window, the reception is repeated in the next SI window for the associated SI message.

In the above-described method, the UE decodes and obtains the frequency domain scheduling information for SIB2 to SIB16 transmitted in the SI window, the DCI of the PDCCH transmitted together with the subframe in which the corresponding SIB is transmitted. Since the SIB1 informs the UE of the time domain scheduling information through the SI window w, the subframe information on which the SIB2 to the SIB16 are transmitted can be acquired only when the UE successfully performs blind decoding on the DCI.

Tables 4 and 5 below show the si -Periodicity < RTI ID = 0.0 > For the SIB for each T is repeatedly transmitted, the SI window start subframe number (SI-window starts at the subframe # a) , and the location of the frame in which SIB is transmitted (frame where the SI is sent, SFN mod T = FLOOR ( x / 10).

W
n-1 1ms 2ms 3ms 10ms 15ms 20ms 40ms 0 0 0 0 0 0 0 0 One One 2 3 0 5 0 0 2 2 4 6 0 0 0 0 3 3 6 9 0 5 0 0 4 4 8 2 0 0 0 0 5 5 0 5 0 5 0 0

W
n-1 1ms 2ms 3ms 10ms 15ms 20ms 40ms 0 0 0 0 0 0 0 0 One 0 0 0 One One 2 4 2 0 0 0 2 3 4 8 3 0 0 0 3 4 6 12 4 0 0 One 4 6 8 16 5 0 One One 5 7 10 20

Period (si -Periodicity) T value SIB (SIB2 to SIB16) for each or the same value as is set in one of 8, 16, 32, 64, 128, 256, 512 with respect to a plurality of SIB, period (si-Periodicity) T The value indicates the number of frames.

For example, when the SIB scheduling information transmitted to the UE through the SIB1 is as shown in Table 6 below, the location of the SIB is shown in FIG. 5 is a diagram for explaining system information time domain scheduling.

W = 10ms SIB2: n = 1, T = 8, a = 0, SFN mod T = 0 SIB13: n = 2, T = 8, a = 0, SFN mod T = 1 SIB 14: n = 3, T = 16, a = 0, SFN mod T = 2

Next, a method of changing the system information message will be described.

FIG. 6 is a diagram for explaining a change of system information. FIG.

Changes in system information occur only in certain radio frames. That is, the concept of the change period in which the change of the system information takes place in a specific radio frame is used. The system information may be transmitted multiple times with the same content within the modification period as defined by the scheduling. The modification period boundaries (modification period boundaries) is SFN mod m = 0 can be defined for a SFN values (The modification period boundaries are defined by SFN values for which SFN mod m = 0). and m is the number of radio frames including the change period. The change period is configured by system information.

When the base station 20 changes system information, the base station 20 first informs the terminal 10 about this change. That is, it can be done through a modification cycle. In the next change period, the base station 20 can transmit the updated system information. In Figure 6, different colors represent different system information. Upon receiving the change notification, the terminal 10 immediately acquires new change information from the start of the next change period. Until the terminal 10 acquires new system information, the terminal can apply previously acquired system information.

The paging message (Paging message) to inform about the changed system information to terminals in the terminal and in the RRC_CONNECTED RRC_IDLE can be used. When the terminal 10 receives a paging message including a specific parameter, for example, a systemInfoModification , it can be known that the system information of the terminal 10 is changed at the next change period boundary. Although the terminal 10 is known about the change in the system information, further details about the change of the system information may not be provided.

A specific parameter, for example SystemInformationBlockType1 , may include a value tag, systemInfoValueTag , which indicates whether the change occurs in system messages. The terminal 10, for example, upon return from out of coverage, A value tag, systemInfoValueTag , can be used to prove whether the previously stored system information messages are still valid. In addition, the terminal 10 may think that the stored system information is invalid if it is not otherwise specified after 3 hours from the moment of being successfully verified.

The UE 10 combines only the received values of the PBCH codeword transmitted within the four frames of the PBCH transmission period and can not combine the received values of the codeword transmitted in the other PBCH transmission periods.

In order for the coverage extended MTC terminal to receive the PBCH and succeed in blind decoding, the base station 20 must repeat the conventionally transmitted PBCH 36 to 95 times. In other words, the PBCH codeword transmitted in four subframes through the conventional four frames must be repeatedly transmitted using 144 to 384 subframes. In case of FDD, it is assumed that one frame is composed of 10 subframes, and that all subframes existing in one frame are used for PBCH transmission, 15 to 39 frames are used for PBCH transmission for MTC terminal with extended coverage .

If a large amount of transmission resources are used for the coverage extended MTC terminal, the transmission resources allocated to other terminals in the same cell are relatively reduced. Also, due to the characteristics of the PBCH periodically transmitted, if the transmission period of the PBCH for the coverage extended MTC terminal is too short, or if the PBCH is continuously transmitted in consecutive frames, in the worst case, other terminals can not be allocated transmission resources. Likewise, the MTC mobile terminal with the coverage expansion can relatively reduce the transmission resources that can be allocated for the physical channels other than the PBCH.

When most DL transmission resources are used for coverage extended UEs in every transmission period, system information is relatively insufficient for PDSCH transmission resources for DTCH (Dedicated Traffic Channel) transmission to each UE.

In order to solve this problem, a method of transmitting the system information intermittently and repeatedly has been proposed. More specifically, the system information transmits system information repeatedly for a terminal whose coverage has been expanded intermittently only for a specific transmission period, and system information is transmitted in the same manner as the conventional method except for the specific system information transmission period. This is called intermittent system information repetition transmission method or intermittent PBCH repetition transmission method.

In the frequency domain, the maximum number of PRB pairs that can be allocated to the MTC terminal is six, and the six consecutive PRBs (or PRB pairs) are called Narrow Band (NB) used by the MTC terminal. Table 7 shows the number of PRBs constituting transmission resources in the frequency domain for each System BW.

The SI transmitted to the MTC terminal is allocated a transmission resource in the frequency domain in units of the NB. Table 8 shows the number of NBs and the number of Remaining PRBs that are not included in the NB when the NBs of frequency resources are set in units of 6 consecutive PRBs.

First, the MTC SIB1 is the first MTC SI received after the MTC terminal receives the MIB. In the present invention, MTC SIB1 uses fixed time domain scheduling in a manner similar to conventional SIB1. In other words, a predefined radio frame period and a single or plural subframes to be used for the MTC SIB1 transmission in the period are defined in advance. The base station transmits the MTC SIB1 to the predefined subframe. The base station needs to repeatedly transmit the MTC SIB1 to the coverage extended MTC terminal. The transmission cycle T _SIB1bis of MTC _SIB1 is defined as 8 radio frames.

In the case where the system BW is 5 MHz or more, if the MTC SIB 1 is repeatedly transmitted, the frequency hopping method using two or four NBs according to the system BW, hopping the frequency transmission resources in different subframes using another NB Lt; / RTI >

- Number of frequency hopping NB N _FH = 2 for system BW of 12-50 RBs

- Number of frequency hopping NB N _FH = 4 for system BW of 51-110 RBs

Therefore, there is a need for a frequency hopping method that can be used for repeated transmission of the MTC SIB1.

The present invention relates to a method of transmitting System Information for a MTC terminal with an extended coverage, more specifically, a method of setting transmission resources and frequency hopping for transmitting System Information.

In the present invention, a frequency hopping method for repeatedly transmitting MTC SIB1 for a coverage extended MTC terminal is proposed.

As shown in Table 8, the number of NBs N _NB that can be used for MTC SIB1 repetition transmission is N _NB = 4, 8, 12, or 16, depending on the system BW. Therefore, N _NB neighbor base station cells in the same subframe can transmit MTC SIB1 using different NBs. In other words, the NBs can be used without overlap so as not to interfere with each other between the MTC SIB1 transmitted by the adjacent base station cell.

However, a frequency hopping pattern should be designed so that the N _NB adjacent base station cells can repeatedly transmit MTC SIB1 using different NBs for subframes repeatedly transmitted by frequency hopping.

[ Example 1 : first subframe  NB index]

In the present invention, the NB to be used in the first subframe in which the MTC SIB1 is transmitted at every transmission cycle of the MTC SIB1 can be determined as follows using the Physical Cell ID (PCID) of each cell and the NB number N _NB according to the system BW. The NB index NBidx _1st used in the first subframe can be determined as follows.

Example 1 -One

The NB index NBidx _1st used in the first subframe uses the result of modulus computation of PCID as NB number N _{NB per} system BW as shown in Equation 1 below.

Example 1 -2

In the case of CRS, if PCID mod 3 calculation result of adjacent cell is different, CRS transmission is performed using different resource element (RE). Therefore, when determining the PCID, the PCID is determined so that the result of the PCID mod 3 is different from the PCID of the adjacent cell. In the case of the embodiment 1-1, as shown in Table 9, the calculation results of the PCID mod 3 have different values but have the same value of NBidx _1st . Therefore, there is no interference among CRSs transmitted from adjacent cells, but interference occurs between MTC SIB1s.

In order to solve such a problem, in the embodiment 1-2, the result of modulus calculation of PCID by a multiple of 3 is used to determine NBidx _1st . Equation 2 below is an embodiment of the embodiment 1-2. The result of modulus computation of the PCID using the maximum value of multiples of 3 less than or equal to N _NB is used as NBidx _1st .

Example 1 -3

Considering the case where the value of the PCID is transmitted in different subframes depending on whether the value of the PCID is in the time domain, the result of modulus calculation of the floor (PCID / 2) by the number _NB of the NBs per system BW Used for NBidx _1st .

Example 1 -4

(PCID / 2) is smaller than N _NB as in the case of the embodiment 1-2 in consideration of the case where the value of the PCID is transmitted in different subframes according to the even or odd number in the time domain, We use the result of the modulus computation using NBidx _1st using the largest of the same multiples of 3.

[ Example 2 : frequency On hopping  NB index used]

이며, n_s는 radio frame 내의 slot index 를 나타낸다), 그리고 주파수 호핑 주기 Y_CH의 함수로 정의할 수 있다.Next, a method for determining the NB index used in the subframe in which the MTC SIB1 is repeatedly transmitted will be described. In the present invention, the MTC SIB1 the NB index to be used for frequency hopping including first NBidx _1st system frame number (SFN) used in the MTC SIB1 transmitted in the transmission period n _f, subframe index in radio frame _sf n (where

, N _s denotes the slot index in the radio frame), and the frequency hopping period Y _CH .

Example 2 -One

Equation (5) defines NB to be hopped by N _NB / N _FH every frequency hopping cycle starting from NBidx _1st .

In the embodiment 2-1, when the frequency hopping period is one radio frame, that is, Y _CH = 10, Equation (5) can be expressed as Equation (6) below.

The frequency hopping pattern of the embodiment 2-1 is as follows and Tables 10 to 13.

Example 2 -2

In the case of N _FH = 4, it is possible to define frequency hopping by alternating N _NB / 2 or N _NB / 4 _NBs as shown in Equation (7).

The frequency hopping pattern of Example 2-2 is shown in Table 14 and Table 15 below.

Example 2 -3

In the case of N _FH = 4, the same hopping pattern is repeated over the frequency hopping period 4 in the embodiment 2-1 and the embodiment 2-2. Embodiment 2-3 is an extension of the same hopping pattern repeated over a repetitive hopping period 8 of a frequency hopping pattern, and can be expressed as Equation 8 below.

The frequency hopping pattern of Embodiment 2-3 is shown in Table 16 and Table 17 below.

Example 2 -4

The central 6PRB of System BW is used for PBCH and PSS / SSS transmission. If the MTC SIB1 is repeatedly transmitted to the same subframe through which the PBCH and the PSS / SSS are transmitted, the transmission data of the MTC SIB1 can be transmitted by puncturing the transmission resources used for the PBCH and PSS / SSS transmission in the same manner as the conventional method.

Alternatively, the NB that overlaps the PBCH and PSS / SSS transmissions may not be used for transmission of the MTC SIB1. In this case, the number of NBs N ' _NB used for repeated transmission and frequency hopping of the MTC SIB1 is as shown in Table 18 below.

Table 19 below shows the relationship between the new NB index NBindex 'used to construct this frequency hopping pattern and the NB index NBindex where the actual MTC SIB1 is transmitted. Therefore, in the embodiment 2-4, a frequency hopping pattern is configured using NBindex ', and the NB index used in the actual MTC SIB1 transmission is found by mapping to Table 19 below and used.

In Example 2-4, as shown in Table 19, the equation of Example 2-2 is generalized in the case where N ' _NB is not a multiple of 4, and when N _FH = 4, N' _NB / 2 or β NB And can be defined as frequency hopping alternately, and can be expressed by Equation (9) below.

또는

를 사용할 수 있다.Where 0 <β <N 'has a range of _NB values. In order to implement a hopping pattern similar to the embodiment 2-2

or

Can be used.

는 내림연산(floor) 그리고

는 올림연산(ceil)을 나타낸다.In this specification,

Is the floor and

Represents a rounding operation (ceil).

Example 2 -5

In Embodiment 2-5, Equation (5) of Embodiment 2-1 can be generalized as shown in Equation (10) below when N ' _NB is not a multiple of 4 as shown in Table 19.

Transmission cycle T _SIB1bis Is a multiple of N _{FH, which} is the number of NBs to be frequency-hopped, Equation (10) can be simplified as shown in Equation (11) below.

In addition, when the frequency hopping period is one radio frame, i.e., Y _CH = 10, Equation (11) can be expressed as Equation (12) below.

The frequency hopping pattern of the embodiment 2-5 is the same as the embodiment 2-1 _{except that} T _SIB1bis = 8 and N _NB = 4, 8, 12 or 16 according to the system BW and N _FH = 2 or 4 as in the embodiment 2-1. -1. &Lt; tb &gt;&lt; TABLE &gt;

Example 2 -6

The above-described embodiments 2-1 to 2-5 are described for transmission of system information.

Embodiment 2-6 describes a method that can be used for physical channel transmission such as general PDSCH / PUSCH / MPDCCH by applying Embodiments 2-1 to 2-5 of the above-described frequency hopping method.

First, NBidx _1st is included in the DCI and transmitted to the terminal. NBidx _1st is used for the first frequency hopping period in which physical channels such as PDSCH / PUSCH / MPDCCH are transmitted, and NBidx is calculated by modifying Equation 10 of Embodiment 2-5 as Equation 13 below in the following frequency hopping cycle Can be used. Here, n _{sf - 1st} is the index of the first subframe used in the first frequency hopping period in which the physical channel such as PDSCH / PUSCH / MPDCCH is transmitted. The value of N _FH can be fixed to 2 or 4 regardless of system BW.

Or in consideration of the PDSCH / PUSCH / MPDCCH the like of the first radio frame used in the first frequency hopping cycle that is a physical channel transmission index n _{f _ 1st} and the index n _{sf_1st} of the first subframe to the configuration as shown in Equation 14 below .

Or in consideration of the first radio frame of index n _{f _ 1st} with the first index n _{sf_1st} of the second subframe and the maximum radio frame number of 1023 used in the first frequency hopping cycle that is a physical channel it is transmitted, such as PDSCH / PUSCH / MPDCCH, even when a frequency hopping period is formed over a subframe of a radio frame number 1023 and a subframe of a subsequent radio frame number 0, it can be configured as shown in Equation (15) so as not to change the NB in the same frequency hopping period.

FIG. 7 illustrates a method in which a base station repeatedly transmits system information according to an embodiment of the present invention.

Referring to FIG. 7, the BS determines an index of a narrowband in a first subframe to be transmitted to the MTC terminal (S700).

The base station can determine the index of the first narrowband band to which the system information is transmitted based on the physical cell ID and the number of narrow bands according to the system bandwidth. For example, the first system information can be transmitted in a narrow band in which a physical cell ID is indexed by a modulo operation on the number of narrow bands according to the system bandwidth.

The base station configures the frequency hopping pattern based on the index of the narrow band to which the system information is first transmitted, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping (S720).

The BS adds the number of narrow bands according to the system bandwidth divided by the number of narrow bands used for frequency hopping to the index of the narrow band to which the system information is transmitted first and adds the number of narrow bands according to the system bandwidth The frequency hopping pattern can be constructed using the modulo operation value.

At this time, a value obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for frequency hopping may be calculated and used.

If the number of narrow bands used for frequency hopping is three or more, the base station can construct a frequency hopping pattern by repeating the above-described frequency hopping pattern configuration scheme.

That is, secondly, a value obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for frequency hopping is added to the narrow band index for transmitting the system information, and the number of narrow bands according to the system bandwidth It is possible to determine the narrow band in which the modulo-calculated value is indexed as the narrow band of the next subframe in which the system information is transmitted.

If the frequency hopping pattern is configured through the above-described procedure, the base station repeatedly transmits the system information to the MTC terminal through the narrow band indicated by the index according to the frequency hopping pattern (S740).

FIG. 8 illustrates a method in which a terminal repeatedly receives system information according to an embodiment of the present invention.

Referring to FIG. 8, the terminal first receives system information in a narrow band determined by the base station (S800).

In the subframe in which the system information is first received, the narrow band may be narrow band, in which the base station indexes a value obtained by modulo calculating the physical cell ID by the number of narrow bands according to the system bandwidth.

After receiving the system information from the base station, the terminal receives the system information in a narrow band according to the frequency hopping pattern determined by the base station in the next subframe in which the system information is repeatedly transmitted (S820).

The narrow band to which the system information is transmitted is obtained by adding the value of the number of narrow bands according to the system bandwidth divided by the number of narrow bands used for frequency hopping to the index of the narrow band to which the system information is transmitted first, And a low-frequency band indexed by a modulo-calculated value of the number of low-frequency bands.

The UE repeatedly receives the system information according to the frequency hopping pattern determined by the base station, so that interference of the system information transmitted from the adjacent base station does not occur.

FIG. 9 is a diagram illustrating a configuration of a base station according to another embodiment.

9, a base station 900 according to another embodiment includes a control unit 910, a transmission unit 920, and a reception unit 930.

The control unit 1010 controls the overall operation of the base station according to the frequency hopping and the transmission resource setting for transmitting the System Information for the coverage extended MTC terminal required to perform the above-described present invention.

The control unit 1010 determines the narrow band in which the physical cell ID is a modulo-calculated value of the number of narrow bands according to the system bandwidth as the narrow band through which the system information is transmitted first.

First, a value obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for frequency hopping is added to the narrow band index at which the system information is transmitted, and the value is divided into the number of narrow bands according to the system bandwidth The frequency hopping pattern is constructed by using the modulo operation value.

That is, the index of the first narrow band is determined based on the physical cell ID and the number of narrow bands according to the system bandwidth, and the index of the first narrow band, the number of narrow bands according to the system bandwidth, A frequency hopping pattern is determined by determining an index of a narrow band to which the system information is transmitted based on the number of narrow bands used.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages and data necessary for carrying out the present invention described above to and from the terminal. The system information is repeatedly transmitted.

10 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

10, a user terminal 1000 according to another embodiment of the present invention includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 1120 sets up a transmission resource for transmitting System Information for the MTC terminal with the extended coverage, which is necessary for carrying out the present invention, and controls the overall operation of the terminal according to frequency hopping.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

System information received or repeatedly received from the base station 1000 by the terminal 1000 is received according to the frequency hopping pattern determined by the base station.

The index of the narrow band of the subframe in which the system information is first transmitted is determined by modulo calculating the physical cell ID of the base station by the number of narrow bands according to the system bandwidth.

Then, the remaining information constituting the frequency hopping pattern based on the index of the narrow band of the subframe in which the system information is first transmitted, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping The index of the low band is determined.

The UE repeatedly receives the system information through the narrow band corresponding to the index of the narrow band included in the frequency hopping pattern.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (24)

A method for a base station to repeatedly transmit system information,
Determining an index of a first narrow band constituting a frequency hopping pattern based on a physical cell ID and a number of narrow bands according to a system bandwidth;
Determining an index of the remaining narrowband that constitutes the frequency hopping pattern based on the physical cell ID, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping; And
Repeatedly transmitting the system information through a narrow band corresponding to an index of a narrow band constituting the frequency hopping pattern,
Wherein determining the index of the first narrowband comprises:
Wherein the index of the first narrow band is determined using a value obtained by performing a modulo operation on the physical cell ID with the number of narrow bands according to the system bandwidth. delete The method according to claim 1,
Wherein determining the index of the remaining narrowband comprises:
A value obtained by modulo calculating the physical cell ID by a modulo operation of the number of narrow bands according to the system bandwidth and a value obtained by dividing the value obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for frequency hopping Wherein the index of the remaining narrow band is determined using a value obtained by modulo calculating the number of narrow bands according to the system bandwidth after adding the multiple. The method according to claim 1,
If the system bandwidth is equal to or more than 12 resource blocks and less than or equal to 50 resource blocks, the number of narrow bands used for frequency hopping is 2. If the system bandwidth is greater than 50 resource blocks, the number of narrow bands used for frequency hopping is equal to 4 &Lt; / RTI &gt; The method according to claim 1,
Wherein the frequency hopping pattern is configured with the exception of the middle narrow band of two narrow bands included in each sub frame. A method for a terminal repeatedly receiving system information,
Receiving the system information first through a narrow band of indices determined based on a physical cell ID and a number of narrow bands according to system bandwidth; And
Receiving the system information via a narrow band of indices determined based on the physical cell ID, the number of narrow bands according to the system bandwidth, and the number of narrow bands used for frequency hopping,
Wherein the first receiving the system information comprises:
Wherein the system information is first received through a narrow band of an index determined using a modulo operation of the physical cell ID with a number of narrow bands according to the system bandwidth. delete The method according to claim 6,
Wherein the receiving the system information comprises:
A value obtained by dividing the value obtained by modulo calculating the physical cell ID by the number of narrow bands according to the system bandwidth and the number obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for the frequency hopping Wherein the system information is received through a narrow band that is indexed by a value obtained by performing a modulo operation on the number of narrow bands according to the system bandwidth. The method according to claim 6,
If the system bandwidth is equal to or more than 12 resource blocks and less than or equal to 50 resource blocks, the number of narrow bands used for frequency hopping is 2. If the system bandwidth is greater than 50 resource blocks, the number of narrow bands used for frequency hopping is equal to 4 &Lt; / RTI &gt; The method according to claim 6,
Wherein the system information is received through narrow bands other than the middle two narrow bands of narrow bands included in each sub-frame. Determining an index of a first narrow band that constitutes a frequency hopping pattern based on a physical cell ID and a number of narrow bands according to a system bandwidth, and determining an index of a physical narrow band based on the physical cell ID, A controller for determining an index of a remaining narrow band that constitutes the frequency hopping pattern based on the number of narrow bands used for hopping; And
And a transmitter for transmitting system information through a narrow band corresponding to an index of a narrow band constituting the frequency hopping pattern,
Wherein,
Wherein the index of the first narrow band is determined using a value obtained by performing a modulo operation on the physical cell ID with a number of narrow bands according to the system bandwidth. delete 12. The method of claim 11,
Wherein,
A value obtained by modulo calculating the physical cell ID by a modulo operation of the number of narrow bands according to the system bandwidth and a value obtained by dividing the value obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for the frequency hopping Wherein the index of the remaining narrow band is determined using a value obtained by modulo calculating the number of narrow bands according to the system bandwidth after adding a multiple. 12. The method of claim 11,
If the system bandwidth is equal to or more than 12 resource blocks and less than or equal to 50 resource blocks, the number of narrow bands used for frequency hopping is 2. If the system bandwidth is greater than 50 resource blocks, the number of narrow bands used for frequency hopping is equal to 4 . 12. The method of claim 11,
Wherein,
Wherein the frequency hopping pattern is configured with the exception of two narrow bands of narrowrobes included in each subframe. Firstly receiving system information via a narrow band of indices determined based on the physical cell ID and the number of narrow bands according to the system bandwidth, and determining the physical cell ID, the number of narrow bands according to the system bandwidth and the frequency Receiving the system information via a narrowband of the determined index based on the number of narrow bands used for hopping,
Wherein the system information is first received through a narrow band of an index determined using a value obtained by modulo calculating the physical cell ID by a number of narrow bands according to the system bandwidth. delete 17. The method of claim 16,
A value obtained by modulo calculating the physical cell ID by a modulo operation of the number of narrow bands according to the system bandwidth and a value obtained by dividing the value obtained by dividing the number of narrow bands according to the system bandwidth by the number of narrow bands used for frequency hopping Wherein the system information is received through a narrow band which is obtained by modulo calculating a modulo operation of the number of narrow bands according to the system bandwidth. 17. The method of claim 16,
If the system bandwidth is equal to or more than 12 resource blocks and less than or equal to 50 resource blocks, the number of narrow bands used for frequency hopping is 2. If the system bandwidth is greater than 50 resource blocks, the number of narrow bands used for frequency hopping is equal to 4 And the terminal. 17. The method of claim 16,
Wherein the system information is received through narrow bands other than the middle narrow bands among the narrow bands included in each sub-frame. delete delete delete delete

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