KR20150105602A - Methods for transmitting paging message and apparatuses thereof - Google Patents

Abstract

The present invention relates to a paging method for a machine-type communications (MTC) terminal and an apparatus thereof. More specifically, the present invention relates to a method for transmitting and receiving a paging message for the MTC terminal by classifying the paging message from a general terminal, and an apparatus thereof. Specifically, the method for receiving a paging message for an MTC terminal includes a step of monitoring a plurality of paging occasions per discontinuous reception (DRX) cycle; and a step of repetitively receiving indication information for indicating the paging message or the paging message through a plurality of sub frames or a plurality of wireless frames.

Description

[0001] The present invention relates to a method and apparatus for transmitting a paging message,

The present invention relates to a paging method and apparatus for a MTC (Machine-Type Communications) terminal. More particularly, to a method and apparatus for transmitting and receiving a paging message for a MTC terminal separately from a general terminal.

Machine-type communication (MTC) refers to machine-type communication, and in one form of data communication represents machine-to-machine communication in which one or more entities do not necessarily require human interaction. MTC, which does not require human interaction, refers to all communication methods in which communication is performed without human intervention in the communication process.

The MTC terminal can be installed in a place where the radio wave environment is worse than that of a general terminal. For example, the MTC terminal can be installed and operated inside a facility such as a basement meter or a dam. Therefore, the MTC terminal is highly likely to be installed in a place where it is difficult to transmit and receive radio waves. Due to such a problem, the MTC terminal may cause problems such as data loss or link loss when data is transmitted / received in a manner that a general terminal transmits / receives data.

Meanwhile, the paging procedure refers to a procedure in which a base station transmits a paging message to a mobile station and the mobile station receives the paging message. This is a basic function of the terminal, and the terminal must smoothly receive the paging message without loss.

However, in the case of the above-mentioned MTC terminal, it is difficult to transmit / receive data to / from the base station due to the installation position or the production cost savings of the MTC terminal. Accordingly, in the case of the MTC terminal, when a paging message is transmitted and received using a paging procedure of a general terminal, problems such as loss of a paging message may occur.

There is a growing demand for communication using an MTC terminal, such as the Internet, and a method for facilitating the paging procedure described above is required.

In accordance with the above-described needs, the present invention proposes a method and apparatus for preventing loss of data in receiving a paging message from a base station by a MTC terminal.

In addition, the present invention proposes a method and apparatus for smoothly receiving a paging message by the MTC terminal by distinguishing the paging between the general terminal and the MTC terminal.

In addition, the present invention proposes a method and apparatus for preventing a general terminal from repeatedly attempting to receive a paging message unnecessarily.

According to an aspect of the present invention, there is provided a method of receiving a paging message by a MTC (Machine-Type Communication) terminal, the method comprising: monitoring a plurality of paging occasions per DRX (Discontinuous Reception) And repeatedly receiving the indication information or the paging message indicating a plurality of subframes or a plurality of radio frames.

According to another aspect of the present invention, there is provided a method for transmitting a paging message, the method comprising: calculating a plurality of paging opportunities for transmitting indication information indicating a paging message for a MTC (Machine-Type Communication) Comprising the steps of repeatedly transmitting an indication information or a paging message over a plurality of subframes or a plurality of radio frames including an opportunity.

According to another aspect of the present invention, there is provided a MTC (Machine-Type Communication) terminal for receiving a paging message, comprising: a controller for monitoring a plurality of paging occasions per DRX (Discontinuous Reception) cycle; And a receiver for repeatedly receiving the message through a plurality of subframes or a plurality of radio frames.

According to another aspect of the present invention, there is provided a base station for transmitting a paging message, the base station including: a controller for calculating a plurality of paging opportunities for transmitting paging messages and indication information indicating paging messages for a MTC (Machine-Type Communication) terminal; And a transmitter for repeatedly transmitting the indication information or the paging message through a plurality of subframes or a plurality of radio frames including a paging opportunity.

INDUSTRIAL APPLICABILITY As described above, the present invention provides an effect of preventing loss of data when a MTC terminal receives a paging message from a base station.

In addition, the present invention distinguishes the paging between the general terminal and the MTC terminal, thereby providing an effect that the MTC terminal can smoothly receive the paging message.

In addition, the present invention provides an effect of preventing a problem that a general terminal repeatedly receives a paging message unnecessarily.

1 is a diagram for explaining a paging procedure.
2 is a diagram illustrating an example of a paging opportunity subframe pattern in a radio frame in a Frequency Division Duplex (FDD) mode.
3 is a diagram illustrating an example of a paging opportunity subframe pattern in a radio frame in a TDD (Time Division Duplex) mode.
4 is a diagram for explaining operations of a terminal according to an embodiment of the present invention.
5 is a diagram for explaining operations of a terminal according to another embodiment of the present invention.
6 is a diagram illustrating uplink / downlink allocation of each subframe according to each configuration of the TDD mode.
7 is a view for explaining the operation of a base station according to another embodiment of the present invention.
8 is a view for explaining the operation of a base station according to another embodiment of the present invention.
9 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
10 is a diagram illustrating a configuration of a base station 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 numerals even though 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. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and 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. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell 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. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is 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 this 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, 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 the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), 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 a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a 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 a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. 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, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

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

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

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

The eNB performs downlink transmission to the UEs. 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.

LTE  Low cost based MTC

Most of the MTC traffic is delay tolerant and has low throughput characteristics. These MTC terminals have been developed at low cost and operated on the basis of GSM / GPRS. There is a need to improve the LTE coverage to 15 to 20 dB for a limited environment, such as when the MTC terminal is built deep inside the building. According to 3GPP TR 36.888, a technology report of the related research item, cost reduction techniques (e.g., 1 Rx antenna, downlink uplink maximum TBS size 1000 bits, reduced baseband downlink channel bandwidth for data channels, etc.) It is possible to reduce the material cost of the LTE terminal for MTC correspondingly to the GPRS modem. Also, according to the above-mentioned technical report, it is possible to achieve a coverage improvement of 15-20dB for both FDD and TDD compared with the normal / general LTE, but considering the terminal power consumption and spectral efficiency, a 15dB coverage improvement target is proposed for FDD have.

This is a method to provide coverage improvement (15dB for FDD) relative to general LTE coverage for LTE-based MTC terminals that are installed in a limited coverage area compared to a general terminal, repetition transmission may be considered. For example, the base station repeatedly transmits a PDCCH transmission, which is performed on a downlink subframe basis, through a plurality of downlink subframes, and the corresponding MTC terminal also combines PDCCHs received through a plurality of downlink subframes and perform decoding to enhance coverage. As another example, the MTC terminal may reduce the number of repetitions described above by using PSD boosting, compact DCI, higher aggregation level, or the like. The terminal may support only a narrowband operation in a technology using method for cost reduction compared to a general terminal. For example, it is possible to support only 1.4MHz bandwidth on the downlink and uplink.

Paging ( Paging )

1 is a diagram for explaining a paging procedure.

Referring to FIG. 1, paging may be used to transmit paging information to a terminal in the RRC IDLE state. Or paging may be used to inform the UE in the RRC IDLE state and the UE in the RRC CONNECTED state of the system information change. Or paging may be used to inform about the Earthquake and Tsunami Warning System (ETWS) notification. Or paging may be used to signal commercial Mobiel Alert System (CMAS) notifications. The paging in the present invention can be applied to each of the paging used in some or all of the above-mentioned situations.

The base station initiates the paging procedure by sending a paging message to the terminal's paging occasion specified in the 3GPP TS 36.304 document. The base station can address a plurality of terminals by including one paging record for each terminal in one paging message. Also, the base station may transmit a paging message to the plurality of terminals through the same subframe, and may transmit the paging message through another subframe as shown in FIG.

The UE in the RRC IDLE state can receive the paging message. If there is a paging record in the paging message, the UE checks whether the UE ID in the paging record matches one of the UE IDs assigned by the upper layers for each paging record. If the terminal identifier in the paging record matches the terminal identifiers assigned by the upper layers, the terminal transmits the corresponding terminal identifier and the core network domain (cN-Domain) to the upper layers.

Paging  reception

One paging occasion (PO) means a subframe in which a P-RNTI transmitted on the PDCCH indicating a paging message exists exists (Paging Occasion (PO) is a subframe where there is P-RNTI transmitted on PDCCH addressing the paging message). In addition, a paging frame (PF) is a radio frame that can include one or more paging opportunities (PF). One Paging Frame (PF) is one radio frame, which may contain one or multiple Paging Occasion (s)). Indicating a paging message is addressing a resource block including a paging message, and the indication information is transmitted through a PDCCH.

Meanwhile, the UE can use Discontinuous Reception (DRX) to reduce power consumption in the IDLE state. When DRX is used, the terminal only needs to monitor one paging opportunity per DRX cycle.

The paging frame and paging opportunity are determined by the following formula using the DRX parameters provided through the system information.

The paging frame is given by Equation (1) below.

[Equation 1]

SFN mod T = (T div N) * (UE_ID mod N)

The index i_s indicating the paging opportunity from the subframe pattern can be derived according to Equation (2) below.

&Quot; (2) "

i_s = floor (UE_ID / N) mod Ns

In Equations (1) and (2), T is the DRX cycle value of the UE. If T is allocated from the upper layer, it is determined by the terminal-specific DRX value and the shortest value of the preset DRX value broadcasted through the system information. If the UE-specific DRX value is not configured from an upper layer, a preset value is applied (T: DRX cycle of the UE. T is determined by the UE-specific DRX value, DRX value broadcast in system information. If UE specific DRX is not configured by upper layers, the default value is applied.

nB may be determined by at least one of 4T, 2T, T, T / 2, T / 4, T / 8, T / 16 and T / 32, and N is determined by min (T, nB). Further, Ns is determined as max (1, nB / T), and UE_ID is determined as IMSI mod 1024. IMSI is given as a sequence of integer digits of (0, ..., 9), where IMSI is expressed as a decimal number and the first digit is given as a sequence expressed by the highest digit (IMSI IMSI shall be interpreted as a decimal integer number, where the first digit given in the sequence represents the highest order digit.

2 is a diagram illustrating an example of a paging opportunity subframe pattern in a radio frame in a Frequency Division Duplex (FDD) mode. 3 is a diagram illustrating an example of a paging opportunity subframe pattern in a radio frame in a TDD (Time Division Duplex) mode.

Referring to FIG. 2 and FIG. 3, a subframe including a paging opportunity may be changed according to the duplex mode. For example, in the case of a terminal operating in FDD mode, when i_s is 0 and Ns is 1, a paging opportunity is allocated in subframe 9. Also, in the case of the UE operating in the TDD mode, when i_s is 0 and Ns is 1, a paging opportunity is allocated in subframe 0.

As described above, in the prior art, when it is desired to provide enhanced coverage to the MTC terminal, the base station has to use a plurality of paging opportunities to perform paging. However, the current paging frame (PF) and the paging opportunity (PO) are calculated based on the UE_ID. In addition, the UE_ID may have the same value as a value obtained through the IMSI mod 1024. Therefore, the paging opportunity for the MTC terminal and the paging opportunity for the general terminal can be calculated equally. When a paging opportunity for an MTC terminal and a paging opportunity for a general terminal are calculated in the same manner, a paging message may include a paging record for a plurality of terminals. In this case, when the MTC terminal including a plurality of paging opportunities is included in one paging message, there is a problem that the paging message for the general terminal may be unnecessarily repeated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for distinguishing paging of an MTC terminal from general terminals in order to provide improved coverage.

In this specification, a general terminal means an existing wireless communication terminal or normal terminals (normal UEs) except for the above-mentioned MTC terminal. That is, a general terminal means a terminal that does not perform repetitive transmission in order to transmit / receive data according to use of coverage expansion or cost reduction technology. In addition, the MTC terminal in this specification can solve the limitation of coverage by a terminal capable of improving coverage to a terminal for improving coverage or a terminal capable of operating a coverage enhancement function or a coverage enhanced enabled terminal or a coverage enhancement function as described above The term " terminal "

In case of MTC terminal, PDSCH or PDCCH needs to be repeatedly transmitted several tens or hundreds of times in the time domain in order to improve coverage by 15-20dB compared to general LTE coverage. Even in the case of the MTC terminal, reception of a paging message is required. The paging message transmission of the MTC terminal may be scheduled by the PDCCH scrambled (or masked) by the P-RNTI. Alternatively, the paging message transmission of the MTC terminal may not be scheduled by the PDCCH scrambled (or masked) by the P-RNTI. For example, the paging message transmission of the MTC terminal can use the conventional RNTI identified by the P-RNTI. For another example, the paging message transmission of the MTC terminal may be scheduled by the EPDCCH scrambled (or masked) by a P-RNTI or a new RNTI. In the case of a MTC terminal supporting only a low-band operation of 1.4 MHz, there is a possibility that the PDCCH can not be decoded in a cell providing a system bandwidth exceeding this. And may include scheduling information on a control channel (EPDCCH) provided through the PDSCH. The scheduling information (time, frequency) of the EPDCCH for addressing the paging message of the MTC terminal may have a fixed position. Alternatively, the scheduling information (time, frequency) of the EPDCCH for addressing the paging message of the MTC terminal may have a predefined pattern. Alternatively, the scheduling information (time, frequency) of the EPDCCH for addressing the paging message of the MTC terminal may be indicated to have a specific pattern through the system information.

As another example, the paging message transmission of the MTC terminal may be transmitted through a fixed scheduling information, which is not scheduled by PDCCH or EPDCCH, or a pattern of indicated scheduling information through predefined scheduling information or system information. The base station can distinguish the paging for the MTC terminal. For example, it may receive indication information on the paging message from the MME (Mobility Management Entity) or may receive the terminal capability information related to the terminal or the MME to distinguish it. The terminal capability information may be received and stored in advance. By using this, the BS can distinguish the paging message for the general terminal and the MTC terminal and transmit the paging message.

Hereinafter, a method of receiving a paging message of the MTC terminal of the present invention will be described with reference to the drawings.

4 is a diagram for explaining operations of a terminal according to an embodiment of the present invention.

A method for receiving a paging message in a MTC (Machine-Type Communication) terminal, the method comprising: monitoring a plurality of paging occasions per DRX (Discontinuous Reception) cycle; And repeatedly receiving the message through a plurality of subframes or a plurality of radio frames.

Referring to FIG. 4, the present invention includes monitoring a plurality of paging occasions per discontinuous reception (DRX) cycle (S410). The MTC terminal needs to monitor the paging opportunity for the MTC terminal different from the paging opportunity of the conventional terminal according to the prior art in order to receive the paging message. To this end, the MTC terminal monitors a paging opportunity in which a P-RNTI (or a paging RNTI for the MTC terminal) exists on a PDCCH / EPDCCH for addressing a paging message for the MTC terminal. Or PDCCH / EPDCCH addressing a paging message for the MTC terminal. Or a paging opportunity for the MTC terminal may be included. However, in the case of a general terminal, one paging opportunity is monitored in one DRX cycle. Since the MTC terminal repeatedly receives a facsimile message and decodes it, it must monitor a plurality of paging opportunities. In monitoring a plurality of paging opportunities in one DRX cycle, the MTC terminal can monitor radio frames or subframes distinct from paging opportunities of a general terminal. In order to calculate the paging opportunity to be monitored by the MTC terminal, a different equation from Equations 1 and 2 may be used. Alternatively, a mathematical expression similar to Equations 1 and 2 may be used. For example, by using the same equation, new paging parameters other than the paging parameters for the general terminal can be received and used through the system information. The concrete calculation method will be described in more detail below when each embodiment is divided.

Thereafter, the MTC terminal repeatedly receives the indication information indicating the paging message or the paging message through a plurality of subframes or a plurality of radio frames (S420). The MTC terminal can repeatedly transmit and receive data to realize coverage improvement or low cost. For example, when the base station transmits data to the MTC terminal, the MTC terminal repeatedly transmits the data through a plurality of subframes, and the MTC terminal can receive the data by combining and decoding the received repeated data. Likewise, even in the case of a paging message, it is repeatedly transmitted and the MTC terminal can receive it. Also, in the case of the MTC terminal, it is possible to repeatedly receive the indication information indicating the paging message through the PDCCH / EPDCCH. Also, the paging message can be repeatedly received on the resource block indicated by the indication information or on the predefined resource block. The indication information or the paging message may be repeatedly received via a plurality of subframes or radio frames, respectively. The MTC terminal can combine and decode a plurality of received instruction information or paging messages to confirm a paging message. The specific procedure and method for confirming the decoded paging message may be the same as that of the general terminal.

For example, a plurality of radio frames including the above-described instruction information or a paging message may be a radio frame not overlapping with a radio frame including a paging message of a general terminal monitoring only one paging opportunity per DRX cycle. The radio frame including the paging opportunity of the general terminal and the radio frame including the paging opportunity of the MTC terminal can be calculated so as not to overlap. Through this, the paging message of the general terminal and the MTC terminal can be transmitted and received separately.

As another example, a plurality of subframes including the above-described indication information or a paging message may be a subframe that does not overlap with a subframe including a paging message of a general terminal monitoring only one paging opportunity per DRX cycle. The subframe in the radio frame including the paging opportunity of the general terminal can be calculated so as not to be overlapped with the subframe including the paging opportunity of the MTC terminal. Through this, the paging message of the general terminal and the MTC terminal can be transmitted and received separately. In this case, the radio frame including the paging opportunity for the MTC terminal may overlap with the general terminal, but the subframes in the radio frame may not overlap. Or a paging opportunity for the MTC terminal may not overlap with the general terminal.

As another example, the P-RNTI (Paging Radio Network Temporary Identity) of the general terminal and the MTC terminal can be distinguished. That is, the P-RNTI of the general terminal and the P-RNTI of the MTC terminal can be determined to be different values and can be distinguished. The instruction (addressing) information indicating the existing paging message is transmitted through the PDCCH, and the PDCCH is scrambled based on the P-RNTI. Therefore, when the P-RNTI of the MTC terminal and the P-RNTI of the general terminal are distinguished, the PDCCH to which the indication information is transmitted can be distinguished. The MTC terminal can receive paging messages separately.

In the case where the instruction information or the paging message for the MTC terminal described above is distinguished from the general terminal, each embodiment will be specifically described below.

5 is a diagram for explaining operations of a terminal according to another embodiment of the present invention.

The method may further include receiving assistance information for receiving a paging message of the MTC terminal from a base station.

Referring to FIG. 5, the MTC terminal may include receiving assistance information (S510). The help information includes parameters for calculating a paging frame or paging opportunity for the MTC terminal, a number of repetitions of the PDCCH / EPDCCH addressing the paging message for the MTC terminal, a starting paging frame, an ending paging frame, And a parameter (e.g., nB) for deriving an ending sub-frame, a paging cycle of the MTC terminal, a coverage level of the MTC terminal, and a paging frame / paging opportunity of the MTC terminal. Alternatively, the assistance information may be conveyed to the system information or to the dedicated higher layer signaling.

The MTC terminal having received the help information can calculate and monitor a paging opportunity or a paging frame for the MTC terminal based on the help information (S520). Operation S520 may be the same as operation S410 of FIG.

In addition, the MTC terminal repeatedly receives the instruction information or the paging message indicating the paging message through a plurality of subframes or a plurality of radio frames (S530). Operation S530 may be the same as operation S420.

Hereinafter, a concrete method of receiving a plurality of instruction information or paging messages separately from a general terminal through a plurality of radio frames or subframes of the MTC terminal of the present invention will be described for each embodiment.

1st Example . MTC  For the terminal Paging  For frame (radio frame) and general terminal Paging  A method for distinguishing a frame (radio frame).

The PDCCH / EPDCCH or the paging message including the indication information for addressing the paging message to receive the paging message by the MTC terminal may require several tens or hundreds of iterative transmissions. The number of repetitive transmissions may vary depending on the technology used in parallel with the goal of coverage improvement, but multiple repetitive transmissions are required.

When the paging message is indicated by the PDCCH / EPDCCH scrambled by the P-RNTI, the base station repeatedly transmits the PDCCH / EPDCCH or PDSCH transmission, which was performed on a downlink subframe basis, through a plurality of downlink subframes . In addition, the MTC terminal may decode the PDCCH / EPDCCHs received through the plurality of downlink subframes and perform decoding to check whether there is a P-RNTI for paging. Then, the MTC terminal can check the paging message by performing decoding by combining the PDSCHs received through the plurality of downlink subframes.

Since the PDCCH / EPDCCH indicating the paging message for the MTC terminal has to be transmitted through a plurality of subframes, the MTC terminal has a plurality of (e.g., Paging opportunities (POs) can be monitored.

The different paging opportunities for the MTC terminals may not be overlapped with each other. Alternatively, paging opportunities for different paging for MTC terminals may not overlap with each other.

On the other hand, paging opportunities for MTC terminals and paging opportunities for general terminals can be prevented from overlapping with each other. For this purpose, the paging opportunity for the MTC terminals can be calculated so as not to overlap with the paging opportunity for the general terminals.

For example, the paging frame (PF) for the MTC terminal can be determined among the radio frames that do not overlap with the paging frame for the general terminal.

The paging frame for the general terminal can be calculated using Equations (1) and (2). That is, a paging frame for a general terminal represents a radio frame having an SFN (System Frame Number) value satisfying Equation (3) below.

&Quot; (3) "

SFN mod T = (T div N) * (UE_ID mod N)

Accordingly, the MTC terminal can calculate a paging frame differently from Equation (3). For example, with respect to the MTC terminal, the paging frame satisfying Equation (4) can be a radio frame for transmitting indication information or a paging message.

&Quot; (4) "

SFN mod T ≠ (T div N) * (UE_ID mod N)

That is, the paging frame for the MTC terminal may be a radio frame having an SFN value satisfying Equation (4) or a radio frame having an SFN value satisfying Equation (4).

Hereinafter, each example will be described in detail.

N, which is a parameter related to the number of paging groups at the radio frame level, is smaller than or equal to T because N uses a small value (min (T, nB)) among T and nB values indicating the DRX cycle of the UE. If N is less than T, there may be a radio frame that does not have one or more paging opportunities. That is, if N and T are equal, there should be one or more paging opportunities for every radio frame, but if N is less than T, there may be radio frames that do not have one or more paging opportunities.

For example, if T = 32 radio frames and nB is T / 16, N = min (T, nB) = T / 16 = 2 radio frames. Therefore, the SFN satisfying the SFN mod 32 = 16 * (UE_ID mod 2) becomes the paging frame. Accordingly, in the case of a general terminal, the UE has two paging groups according to the UE_ID, one group has a paging frame having SFNs (0, 32, 64, ...), and the other group has SFNs (16, 48, 80, ...) as a paging frame.

In this case, the MTC terminal may have a SFN satisfying SFN mod 32 ≠ 16 * (UE_ID mod 2) or a specific SFN satisfying the SFN mod 32 ≠ 16 * (UE_ID mod 2) as a paging frame. That is, SFNs other than the SFNs (0, 32, 64, ...) and (16, 48, 80, ...) of the above two groups calculated as paging frames for the general terminal are set as paging frames for the MTC terminal .

For example, if you use the paging cycle in units of 32 radio frames (0, 32, 64, ...) and not (16, 48, 80, ...) , (15, 47, 79, ...) and (17, 49, 81, ...), ... , (31, 63, 95, ...) may be used as a paging frame for the MTC terminal.

As another example, the paging frame for the MTC terminal may be determined by the following equation (5).

&Quot; (5) "

(SFN + k) mod T = (T div N) * (UE_ID mod N)

In Equation (5), k may be a natural number other than 0, or k may be a set of natural numbers other than 0. For example, k = {1,2, ... , n} and n may be a natural number less than 16. Or k = {1,2, ... , n}, n is the minimum natural number that may contain the number of repeated subframes, and k may not include 16. Alternatively, k = {1,2, ... (T div N)}.

(31, 63, 95, ...), (15, 47, 79, ...), since k = 1 (SFN + 1) mod 32 = 16 * (UE_ID mod 2) ..., 14), k = 2 (SFN + 2) mod 32 = 16 * (UE_ID mod 2). ...) can be a paging frame for the MTC terminal.

As described above, the PDCCH or the paging message including the indication information indicating the paging message may require repeated transmission of several tens or hundreds of times. If it is assumed that 80 repetitive transmissions are required and a subframe pattern of FIG. 2 or FIG. 3 is used in one radio frame, 80 radio frames may be required if one paging opportunity is provided per radio frame. If you use both paging opportunities per radio frame, you may need 40 radio frames. If you use all four paging opportunities per radio frame, you may need 20 radio frames. As another example, if it is assumed that 80 repetitive transmissions are required and all subframes are used in a radio frame, unlike FIG. 2 or FIG. 3, in one radio frame, all 10 subframes per radio frame are used as paging opportunities 8 radio frames may be needed. For example, if it is assumed that 80 repetitive transmissions are required and one radio frame uses a part of a subframe in a radio frame unlike FIG. 2 or FIG. 3, if there are m paging opportunities per radio frame 80 div m) radio frames may be required.

In the case of the MTC terminal, the number of radio frames necessary for the paging frame may vary depending on the number of repetitive transmissions required for improving the coverage. For example, assuming that the subframe pattern of FIG. 2 or FIG. 3 is used, a PDCCH indicating a paging message for an MTC terminal is received through 20 radio frames using all four paging opportunities per radio frame K = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} or k = {1, 2, , 2,3,4,5,6,7,8,9,10,11,12,13,14,15}. ≪ / RTI >

Meanwhile, as another example, the paging frame for the MTC terminal may be determined by the following Equation (6).

&Quot; (6) "

SFN mod T = (T div N) * (UE_ID mod N) + offset

In Equation (6), offset may be a natural number other than zero. Alternatively, offset can be a set of non-zero natural numbers. For example, offset = {1,2, ... , n}, and n may be a natural number less than 16. Or, offset = {1,2, ... , n}, and n may be the minimum natural number that may include the number of repeated subframes, where offset may not include 16 or (T div N). Or, offset = {1,2, ... , (T div N)} and 1 <= offset <(T div N)).

(1, 33, 65, ...), (17, 49, 81, ...) because offset = 1, SFN mod 32 = 16 * (UE ID mod 2) (2, 34, 66, ...), (18, 50, 82, ...) to the MTC terminal 32 because it satisfies SFN mod 32 = 16 * (UE_ID mod 2) As shown in FIG.

As described above, the PDCCH / EPDCCH or the paging message including the indication information indicating the paging message may require repeated transmission of several tens or hundreds of times. For example, assuming that 80 repetitive transmissions are required and that one radio frame uses the subframe pattern of FIG. 2 or FIG. 3, if there is one paging opportunity per radio frame, then 80 radio frames may be needed have. If you use both paging opportunities per radio frame, you may need 40 radio frames. If you use all four paging opportunities per radio frame, you may need 20 radio frames. As another example, if it is assumed that 80 repetitive transmissions are required and all subframes are used in a radio frame, unlike FIG. 2 or FIG. 3, in one radio frame, all 10 subframes per radio frame are used as paging opportunities 8 radio frames may be needed. For example, if it is assumed that 80 repetitive transmissions are required and one radio frame uses a part of a subframe in a radio frame unlike FIG. 2 or FIG. 3, if there are m paging opportunities per radio frame 80 div m) radio frames may be required.

In the case of the MTC terminal, the number of radio frames necessary for the paging frame may vary depending on the number of repetitive transmissions required for improving the coverage. For example, assuming that the subframe pattern of FIG. 2 or FIG. 3 is used, a PDCCH indicating a paging message for an MTC terminal is received through 20 radio frames using all four paging opportunities per radio frame (SFN + k) mod T = (T div N) * UE_ID mod N + offset, offset = {1,2,3,4,5,6,7,8,9,10} or offset = , {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}.

On the other hand, as another method for calculating a radio frame of the MTC terminal to be distinguished from a general terminal, a start SFN (or a start radio frame) and an end SFN are specified, or a start SFN (or a start radio frame) Or a starting radio frame (or starting radio frame) and a number of repetitive radio frames, or designating a number of repetitions for PDCCH reception indicating a paging message, the terminal or the base station transmits SFN mod 32 ≠ 16 * (UE_ID mod 2) can be a paging frame. Alternatively, in the above case, the UE or the base station starts receiving the PDCCH indicating the paging message, and sequentially transmits the radio frame from the first radio frame satisfying the SFN mod 32? 16 * (UE_ID mod 2) to the paging frame can do.

Another example is to specify a starting paging frame to start PDCCH reception indicating a paging message by specifying a specific value in offset from SFN mod T = (T div N) * (UE_ID mod N) + offset, A continuous radio frame satisfying the repetition number may be a paging frame.

As described above, the PDCCH or the paging message including the indication information indicating the paging message may require repeated transmission of several tens or hundreds of times. For example, assuming that 80 repetitive transmissions are required and that one radio frame uses the subframe pattern of FIG. 2 or FIG. 3, if there is one paging opportunity per radio frame, then 80 radio frames may be needed have. If you use both paging opportunities per radio frame, you may need 40 radio frames. If you use all four paging opportunities per radio frame, you may need 20 radio frames. Therefore, a continuous radio frame that satisfies the number of repetitions from the first radio frame for PDCCH reception or the first radio frame for PDCCH reception during radio frames other than (0, 32, 64, ...) and (16, Can be used as a paging frame. For example, assuming that the subframe pattern of FIG. 2 or FIG. 3 is used, if it is desired to receive a PDCCH indicating a paging message for the MTC terminal through 20 radio frames using all four paging opportunities per radio frame , The initial radio frame for PDCCH reception or the first radio frame for PDCCH reception is 1 (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 , 17, 18, 19, 20, 21) can be used as a paging frame.

Or a paging frame for a general terminal in the case of using a wireless frame as a paging frame.

Hereinafter, a system information for receiving a paging message of the MTC terminal and a method for receiving the paging message by distinguishing the system information from the general terminal will be described in another embodiment of the present invention.

On the other hand, the help information including the parameter for calculating the paging frame or paging opportunity for the MTC terminal or the information for receiving the paging message for the MTC terminal can be provided from the base station through the system information. Or assistance information may be configured via dedicated signaling (e.g., an RRC message). Or the help information may be set in advance in the terminal.

For example, the help information may include a number of repetitions of the PDCCH / EPDCCH indicating a paging message for the MTC terminal, a starting paging frame, an end paging frame, a paging opportunity starting subframe, a paging opportunity ending subframe, (E. G., NB) for deriving the coverage level of the MTC terminal, the paging frame of the MTC terminal and the paging opportunity.

As another example, the above-described help information may include scheduling information of the PDCCH / EPDCCH indicating the paging message for the MTC terminal.

As another example, the paging message transmission of the MTC terminal may be transmitted via a fixed scheduling information or a pattern of indicated scheduling information via system information, which is not scheduled by PDCCH or EPDCCH. In this case, the help information includes a start paging frame, an end paging frame, a paging opportunity start sub frame, a paging opportunity end sub frame, a paging cycle of the MTC terminal, a coverage level of the corresponding MTC terminal, an MTC An MTC terminal paging frame for receiving a paging message of the terminal, and a parameter (for example, nB) for deriving a paging opportunity of the MTC terminal.

The number of MTC terminals in a certain cell may be different from the number of general terminals. For example, the number of MTC terminals may be more or less than the number of general terminals. Therefore, the number of paging groups for the MTC terminal can be made different from the number of paging groups for the general terminal.

As an example of this, the nB value for the MTC terminal may be added to the nB value for the general terminal, and the nB value for the MTC terminal may be provided as the system information. That is, the nB value, which is a parameter used to derive the number of subframes used for paging in each radio frame, is added to the nB value for the general terminal, . That is, in addition to the paging parameter for the general terminal, a new paging parameter for the MTC terminal can be received through the system information, and the paging occasion can be calculated and used by using the conventional equation or the equation of the present invention. When the conventional equation is used, the paging occasion for the general terminal and the paging occasion for the MTC terminal may overlap. However, the MTC terminal paging procedure through the present invention is distinguished from the paging message receiving method of a general terminal using the above-described methods. For example, the P-RNTI of the general terminal and the P-RNTI of the MTC terminal are distinguished from each other, so that each terminal can separately receive the paging message. In another example, the PDCCH for receiving the paging message of the general terminal and the PDCCH / EPDCCH for receiving the paging message of the MTC terminal are distinguished from each other, so that each terminal can separately receive the paging message. In another example, the MTC terminal directly monitors the paging opportunity, which may include the paging message for the MTC terminal, through the received system information, so that each terminal can separately receive the paging message.

Accordingly, the general terminal can distinguish the receiving method of the paging message and the receiving method of the paging message for the MTC terminal according to the conventional method, so that the general terminal and the MTC terminal can independently receive the paging message.

Meanwhile, the MTC terminal must receive a PDCCH / EPCCH or a paging message including indication information repeated several times or several hundred times in order to receive a paging message. Therefore, it is possible to notify that the paging message for the MTC terminal exists through the system information. That is, the MTC terminal receiving the paging-related parameter for the MTC terminal through the system information and recognizing the operation of the paging for the MTC terminal can start the operation for receiving the paging message. This is because the method of the first embodiment Or may be the method of the second embodiment described below. Or the scheduling information (time, frequency) for the paging message received through the system information, or may be other methods.

For example, the scheduling information for the message of the paging opportunity of the MTC terminal received through the system information of the MTC terminal may be the time frequency information of the PDCCH / EPDCCH indicating the paging message of the MTC terminal. The MTC terminal can receive the paging message of the MTC terminal using the scheduling information indicating the paging message distinguished from the general terminal. For example, the scheduling information for the paging message of the MTC terminal received by the MTC terminal through the system information may be time-frequency scheduling information of the paging message itself of the MTC terminal. The MTC terminal can receive the paging message of the MTC terminal by using it.

As described above, in the present invention, the paging occasion of the MTC terminal includes the time when the scheduling information indicating the paging message of the MTC terminal exists, the time when the scheduling information of the paging message itself exists, or the scheduling information indicating the paging message of the MTC terminal Frequency resource in which information exists or a time / frequency resource in which scheduling information of the paging message itself of the MTC terminal exists.

Hereinafter, another method of distinguishing and receiving paging between a general terminal and a MTC terminal will be described with reference to FIG. 4 and FIG. 5 as another embodiment of the present invention.

Second Example : MTC  For the terminal Paging  Opportunities for general terminals Paging  How to distinguish opportunities.

The MTC terminal may need to repeatedly transmit PDCCH / EPDCCH or paging message containing indication information indicating the paging message to receive the paging message, or several hundreds of times for the paging message.

For example, when a paging message is indicated by a PDCCH / EPDCCH scrambled by a P-RNTI, the base station repeats PDCCH / EPDCCH or PDSCH transmissions on a downlink subframe basis through a plurality of downlink subframes . The MTC terminal combines and decodes the PDCCH / EPDCCHs received through the plurality of downlink subframes to confirm whether there is a P-RNTI for paging (or an RNTI for paging the MTC terminal). The PDSCHs received through the plurality of downlink subframes are combined and decoded to confirm the paging message.

Since the PDCCH / EPDCCH including the indication information indicating the paging message for the MTC terminal has to be transmitted through a plurality of subframes, the MTC terminal can not transmit the PDCCH / EPDCCH per DRX cycle when DRX is used (or DRX is used in the RRC IDLE state) A plurality of paging opportunities (POs) can be monitored.

The different paging opportunities for the MTC terminals may not be overlapped with each other. Alternatively, paging opportunities for different paging for MTC terminals may not overlap with each other.

In addition, the present invention can prevent paging opportunities for MTC terminals and paging opportunities for general terminals from overlapping with each other. For this, the paging opportunity for the MTC terminals can be calculated so as not to overlap with the paging opportunity for the general terminals.

 As an example of this, a paging opportunity for the MTC terminal can be determined among subframes other than a subframe corresponding to a paging opportunity for a general terminal. That is, the subframe including the paging opportunity of the MTC terminal and the subframe including the paging opportunity of the general terminal may be determined so as not to overlap with each other.

The paging opportunity for the general terminal can be calculated from the subframe pattern of FIG. 2 or FIG. 3 indicated according to the index i_s derived according to Equation (2) as described above.

Referring to FIG. 2, when the general terminal operates in the FDD mode, the paging opportunity can be included in the 9th subframe when the number of subframes used in the radio frame is one (Ns = 1) = 2) may be included in the 4th and 9th subframes. In addition, in case of four (Ns = 4), it can be included in 0, 4, 5, and 9 subframes.

3, when the general terminal operates in the TDD mode, the paging opportunity can be included in the 0-th subframe when there is one subframe used in the radio frame (Ns = 1) ) May be included in the 0th and 5th subframes. In addition, in case of four (Ns = 4), it can be included in 0, 1, 5, 6 subframes.

Unlike the general terminal described above, the paging opportunity for the MTC terminal can be transmitted using a subframe different from the paging opportunity for the general terminal.

For example, when the number of subframes used in a radio frame is one for a general terminal operating in the FDD mode (that is, when nB = T because Ns = max (1, nB / T) = 1) One or more of 0, 4, and 5 subframes other than the 9th subframe used for the MTC terminal may be used as a paging opportunity for the MTC terminal.

As another example, for a general terminal operating in the FDD mode, when there are two subframes used in a radio frame (i.e., nB = 2T since Ns = max (1, nB / T) = 2) One or more of the subframes 0 and 5, which are not the 4th and 9th subframes used, may be used as a paging opportunity for the MTC terminal.

Another example is to use one or more of the first, second, third, sixth, seventh, and eighth subframes other than the 0th, 4th, 5th, and 9th subframes used for a general terminal operating in the FDD mode The subframe can be used as a paging opportunity for the MTC terminal.

As another example, the 0th, 4th, 5th, and 9th subframes used for the general terminal operating in the FDD mode may be used as a paging opportunity for the MTC terminal. For example, it may be the same as the subframe number of the general terminal combined with the first embodiment, but the wireless frames may be different from each other.

The case of the TDD mode will be described.

For example, when the number of subframes used in a radio frame is one for a general terminal operating in the TDD mode (i.e., nB = T because Ns = max (1, nB / T) = 1) One or more subframes of # 1, # 5, # 6 rather than # 0 subframe to be used may be used as a paging opportunity for the MTC terminal.

As another example, when the number of subframes used in a wireless frame is two for a general terminal operating in the TDD mode (i.e., nB = 2T since Ns = max (1, nB / T) = 2) One or more of the subframes # 1 and # 6 rather than the 0th and 5th subframes to be used may be used as a paging opportunity for the MTC terminal.

As another example, it is possible to use one or more of 2, 3, 4, 7, 8, and 9, rather than 0, 1, 5, 6 subframes used for a general terminal operating in TDD mode The subframe can be used as a paging opportunity for the MTC terminal.

As another example, 0, 1, 5, 6 subframes used for a general terminal operating in the TDD mode can be used as a paging opportunity for the MTC terminal. For example, it may be the same as the subframe number of the general terminal combined with the first embodiment, but the wireless frames may be different from each other.

As another example, TDD mode may be selected among 2, 3, 4, 7, 8 and 9 instead of 0, 1, 5 and 6 subframes used for a general terminal operating in TDD mode One or more subframes that can be configured as downlink subframes (or may be configured as downlink and special subframes) according to the uplink / downlink configuration in the mobile station can be used as a paging opportunity for the MTC terminal. Referring to FIG. 6, at least one subframe among the subframes # 3, # 4, # 7, # 8, and # 9 for TDD configuration # 5 may be used as a paging opportunity for the MTC terminal. Or a subframe pattern that can be used as a paging opportunity for the MTC terminal may vary depending on the TDD configuration.

In order to receive the paging message, the MTC terminal may distinguish the PDCCH / EPDCCH including the indication information from the subframe for the general terminal or the subframe for the general terminal, The PDSCH including the paging message can be repeatedly received through a specific subframe.

For example, when a general terminal operating in the FDD mode transmits one or more of 0, 4, 5, and 9 subframes used for paging message transmission within a radio frame to a sub-frame for transmitting a paging message for the MTC terminal Frame. That is, for a general terminal operating in the FDD mode, one or more of 0, 4, 5, and 9 subframes used as a PDSCH subframe for transmitting a paging message in a radio frame in the time domain are paged It can be used as a sub-frame for transmitting a message. In order to avoid duplication with the multicast subframe in the FDD mode, the MTC terminal transmits 0, 4, 5, and 9, which are used as PDSCH subframes for paging message transmission in the wireless frame in the time domain, PDSCH subframe for transmitting the paging message for the PDSCH.

As another example, when the number of subframes used in a radio frame is one for a general terminal operating in the FDD mode (i.e., nB = T because Ns = max (1, nB / T) = 1) 4, and 5 may be used as a subframe for transmitting a paging message for the MTC terminal.

As another example, when the number of subframes used in a wireless frame is two for a general terminal operating in the FDD mode (i.e., nB = 2T since Ns = max (1, nB / T) = 2) 5 may be used as a subframe for transmitting a paging message for the MTC terminal.

Another example is to use one or more of the first, second, third, sixth, seventh, and eighth subframes other than the 0th, 4th, 5th, and 9th subframes used for a general terminal operating in the FDD mode A subframe can be used as a subframe for transmitting a paging message for the MTC terminal.

The case of the TDD mode will be described.

One or more of 0, 1, 5, and 6 subframes used for transmitting a paging message in a radio frame to a general terminal operating in the TDD mode is used as a subframe for transmitting a paging message for the MTC terminal . Alternatively, for a general terminal operating in the TDD mode, one or more subframes of 0, 1, 5, 6 used as a PDSCH subframe for paging message transmission in a radio frame in the time domain may be paged It can be used as a sub-frame for transmitting a message. Alternatively, in order to avoid duplication with the multicast subframe operating in the TDD mode, the PDSCH subframe for the paging message transmission in the radio frame in the time domain is transmitted to the general terminal in the order of 0, 1, 5, 6 Frame may be used as a PDSCH subframe for transmitting a paging message for the MTC terminal.

For example, when the number of subframes used in a radio frame is one for a general terminal operating in the TDD mode (that is, when nB = T because Ns = max (1, nB / T) = 1) One or more subframes other than the 0th subframe used for the MTC terminal may be used as a subframe for transmitting the paging message for the MTC terminal.

As another example, when the number of subframes used in a wireless frame is two for a general terminal operating in the TDD mode (i.e., nB = 2T since Ns = max (1, nB / T) = 2) One or more subframes other than the 0th and 5th subframes used may be used as a paging opportunity for the MTC terminal.

As another example, it is possible to use one or more of 2, 3, 4, 7, 8, and 9, rather than 0, 1, 5, 6 subframes used for a general terminal operating in TDD mode A subframe can be used as a subframe for transmitting a paging message for the MTC terminal.

As another example, it is possible to use one or more of 2, 3, 4, 7, 8, and 9, rather than 0, 1, 5, 6 subframes used for a general terminal operating in TDD mode A subframe can be used as a subframe for transmitting a paging message for the MTC terminal.

As another example, it can be seen that, among the 2, 3, 4, 7, 8 and 9 subframes other than the 0, 1, 5 and 6 subframes used for the general terminal operating in the TDD mode, One or more subframes that can be configured as downlink subframes (or may comprise downlink and special subframes) according to the uplink / downlink configuration of the MTC terminal can be used as a paging opportunity for the MTC terminal. For example, in FIG. 6, at least one subframe among 3, 4, 7, 8, and 9 subframes for TDD configuration 5 can be used as a paging opportunity for the MTC terminal. Or a subframe pattern that can be used as a subframe for transmitting a paging message to the MTC terminal according to the TDD configuration may be changed.

Hereinafter, a system information for receiving a paging message of the MTC terminal and a method for receiving the paging message by distinguishing the system information from the general terminal will be described in another embodiment of the present invention.

The help information including the parameter for calculating the paging frame or paging opportunity for the MTC terminal or the information for receiving the paging message for the MTC terminal may be provided by the base station through the system information. Or assistance information may be configured via dedicated signaling (e.g., an RRC message). Or the help information may be set in advance in the terminal.

The help information includes the number of repetitions of the PDCCH / EPDCCH indicating the paging message for the MTC terminal, the start paging frame, the end paging frame, the paging opportunity start subframe, the paging opportunity ending subframe, the presence or absence of a paging message for the MTC terminal , A paging cycle of the MTC terminal, a coverage level of the corresponding MTC terminal, a paging frame of the MTC terminal, and a parameter (for example, nB) for deriving a paging opportunity.

As another example, the above-described help information may include scheduling information of the PDCCH / EPDCCH indicating the paging message for the MTC terminal.

As another example, the paging message transmission of the MTC terminal may be transmitted via a pattern of scheduling information that is not scheduled by the PDCCH or EPDCCH and is indicated via fixed scheduling information or predefined scheduling information or system information. In this case, the help information includes a start paging frame, an end paging frame, a paging opportunity start sub frame, a paging opportunity end sub frame, a paging cycle of the MTC terminal, a coverage level of the corresponding MTC terminal, an MTC An MTC terminal paging frame for receiving a paging message of the terminal, and a parameter (for example, nB) for deriving a paging opportunity of the MTC terminal.

The number of MTC terminals in a certain cell may be different from the number of general terminals. For example, the number of MTC terminals may be more or less than the number of general terminals. Therefore, the number of paging groups for the MTC terminal can be made different from the number of paging groups for the general terminal.

As an example of this, the nB value for the MTC terminal may be added to the nB value for the general terminal, and the nB value for the MTC terminal may be provided as the system information. That is, the nB value, which is a parameter used to derive the number of subframes used for paging in each radio frame, is added to the nB value for the general terminal, .

That is, in addition to the paging parameter for the general terminal, a new paging parameter for the MTC terminal can be received through the system information, and the paging occasion can be calculated and used by using the conventional equation or the equation of the present invention. When the conventional equation is used, the paging occasion for the general terminal and the paging occasion for the MTC terminal may overlap. However, the MTC terminal paging procedure through the present invention is distinguished from the paging message receiving method of a general terminal using the above-described methods. For example, the P-RNTI of the general terminal and the P-RNTI of the MTC terminal are distinguished from each other, so that each terminal can separately receive the paging message. In another example, the PDCCH for receiving the paging message of the general terminal and the PDCCH / EPDCCH for receiving the paging message of the MTC terminal are distinguished from each other, so that each terminal can separately receive the paging message. In another example, the MTC terminal directly monitors the paging opportunity, which may include the paging message for the MTC terminal, through the received system information, so that each terminal can separately receive the paging message.

Accordingly, the general terminal can distinguish the receiving method of the paging message and the receiving method of the paging message for the MTC terminal according to the conventional method, so that the general terminal and the MTC terminal can independently receive the paging message.

On the other hand, the MTC terminal must receive a PDCCH / EPDCCH or a paging message including indication information repeated several times or several hundred times in order to receive a paging message. Therefore, it is possible to notify that the paging message for the MTC terminal exists through the system information. That is, the terminal receiving the paging-related parameter for the MTC terminal through the system information and recognizing that the paging for the MTC terminal is operating can start the operation for receiving the paging message. This is because the method of the first embodiment Or may be the method of the second embodiment. Or the scheduling information (time, frequency) for the paging message received through the system information, or may be other methods. For example, the scheduling information for the paging message of the MTC terminal received by the MTC terminal through the system information may be the time frequency information of the PDCCH / EPDCCH indicating the paging message of the MTC terminal. The MTC terminal can receive the paging message of the MTC terminal using the scheduling information indicating the paging message distinguished from the general terminal. For example, the scheduling information for the paging message of the MTC terminal received by the MTC terminal through the system information may be time-frequency scheduling information of the paging message itself of the MTC terminal. The MTC terminal can receive the paging message of the MTC terminal using the scheduling information of the paging message differentiated from the general terminal.

As described above, in the present invention, the paging occasion of the MTC terminal includes the time when the scheduling information indicating the paging message of the MTC terminal exists, the time when the scheduling information of the paging message itself exists, or the scheduling information indicating the paging message of the MTC terminal Frequency resource in which information exists or a time / frequency resource in which scheduling information of the paging message itself of the MTC terminal exists.

Third Example : P- RNTI Lt; / RTI &gt;

The paging frame or paging opportunity for the MTC terminal may be overlapped with the general terminal in a manner different from the first and second embodiments described above. For this, the P-RNTI for the MTC terminal can be provided using a different value from the P-RNTI for the general terminal.

Alternatively, the P-RNTI for the MTC terminal may be provided using a different value from the P-RNTI for the general terminal together with the above-described embodiments of the present invention.

If the P-RNTI for the MTC terminal is used as a different value from the P-RNTI for the general terminal, even if the general terminal receives the PDCCH including the P-RNTI for the MTC terminal in the paging opportunity, The P-RNTI for the general terminal may be different from the P-RNTI for the general terminal, so that the corresponding paging message transmitted on the PCH may not be processed.

That is, the general terminal can process the corresponding paging message transmitted on the PCH only when detecting the P-RNTI for the general terminal in the paging opportunity for the general terminal. Therefore, even if the paging opportunities of the general terminal and the MTC terminal overlap, the paging message may not be received from the general terminal. In other words, paging reception can be performed only when there is a P-RNTI for a general terminal.

On the other hand, even if the PDCCH / EPDCCH indicating the paging message for the MTC terminal overlaps with the paging opportunity for the general terminal, if the MTC terminal knows that the paging opportunity is a paging opportunity to be decoded by itself, .

As described above, in the present invention, the paging occasion of the MTC terminal includes the time at which the scheduling information indicating the paging message of the MTC terminal exists, the time at which the scheduling information of the paging message itself of the MTC terminal exists or the paging message of the MTC terminal Frequency resources in which the scheduling information exists or scheduling information of the paging message itself of the MTC terminal. In this case, although the paging occasion of the MTC terminal overlaps with the paging occasion of the general terminal in time, it can be distinguished through the use of another RNTI or the use of other scheduling information (for example, frequency). Therefore, the paging of the MTC terminal can be received separately from the paging of the general terminal.

Each of the embodiments of the present invention described above may be applied independently of one another, or may be applied to one or more of them.

Hereinafter, each embodiment of the present invention will be described again with reference to the drawings from the viewpoint of a base station.

7 is a view for explaining the operation of a base station according to another embodiment of the present invention.

In another aspect of the present invention, a method for transmitting a paging message includes: generating a plurality of paging opportunities for transmitting paging messages and indication information indicating paging messages for an MTC (Machine-Type Communication) terminal; And repeatedly transmitting the indication information or the paging message through a plurality of subframes or a plurality of radio frames including a paging opportunity.

Referring to FIG. 7, the base station includes a step of calculating a plurality of paging opportunities for transmitting instruction information and a paging message for indicating a paging message for an MTC (Machine-Type Communication) terminal (S710). For example, the base station can calculate a paging opportunity for transmitting a paging message by distinguishing the general terminal and the MTC terminal. Specifically, a plurality of paging opportunities for the MTC terminal can be calculated. The paging opportunity may be included in a plurality of radio frames or subframes.

As an example, a plurality of radio frames including a paging opportunity may be calculated so as not to overlap with a radio frame including a paging message of a general terminal that generates only one paging opportunity. That is, as described with reference to the first embodiment, the radio frame including the paging opportunity can be calculated so as not to overlap with the general terminal.

As another example, a plurality of subframes including a paging opportunity may be calculated so as not to overlap with a subframe including a paging message of a general terminal that generates only one paging opportunity. That is, as described with reference to the second embodiment, the subframe including the paging opportunity can be calculated so as not to overlap with the general terminal. Here, the radio frame may be overlapped with a general terminal or may not be overlapped.

As another example, the P-RNTI for the MTC terminal and the P-RNTI for the general terminal may be separated values. The BS transmits the scrambled PDCCH to the MS using the P-RNTI for the MTC MS so that the MTC MS and the MS can distinguish the paging message using the PDCCH.

As another example, the scheduling information indicating the paging message for the MTC terminal may be distinguished from the scheduling information for indicating the paging message for the general terminal, and transmitted to the terminal through the system information, so that the MTC terminal and the general terminal can distinguish the paging message have.

Thereafter, the base station repeatedly transmits the indication information or the paging message through the plurality of subframes or the plurality of radio frames including the paging opportunity (S720). For example, as described in the above-described embodiments, a paging message or indication information can be transmitted through a plurality of radio frames or a plurality of sub-frames repeatedly transmitted. The indication information may be transmitted on the PDCCH / EPDCCH. Or the indication information may be transmitted through the scheduling information received via the system information.

Here, a plurality of subframes or a plurality of radio frames including a paging opportunity may mean a paging frame or a subframe calculated by each of the above embodiments. Or the paging frame or subframe indicated by the scheduling information received via the system information. Or a paging frame or subframe indicated by the scheduling information of the paging message received via the system information.

8 is a view for explaining the operation of a base station according to another embodiment of the present invention.

The base station according to another embodiment of the present invention may further include transmitting assistance information for receiving a paging message of the MTC terminal to the MTC terminal (S810).

For example, the help information may include a parameter for calculating a paging frame or paging opportunity for the MTC terminal, a number of repetitions of the PDCCH / EPDCCH indicating a paging message for the MTC terminal, a start paging frame, an end paging frame, , A paging opportunity termination subframe, a paging cycle of the MTC terminal, a coverage level of the MTC terminal, and a parameter (for example, nB) for deriving the paging frame / paging opportunity of the MTC terminal. As another example, the above-described help information may include scheduling information of the PDCCH / EPDCCH indicating the paging message for the MTC terminal.

As another example, the paging message transmission of the MTC terminal may be transmitted via a fixed scheduling information or a pattern of indicated scheduling information via system information, which is not scheduled by PDCCH or EPDCCH. In this case, the help information includes a start paging frame, an end paging frame, a paging opportunity start sub frame, a paging opportunity end sub frame, a paging cycle of the MTC terminal, a coverage level of the corresponding MTC terminal, an MTC An MTC terminal paging frame for receiving a paging message of the terminal, and a parameter (for example, nB) for deriving a paging opportunity of the MTC terminal.

The base station may forward the assistance information to the system information or to higher layer signaling.

The base station includes a step of calculating a plurality of paging opportunities for transmitting the paging message and the paging message for the MTC terminal (S820). In calculating the paging opportunity, the base station can calculate using the above-described help information. The paging opportunity can be calculated according to the method according to each embodiment of the present invention described in step S710 described with reference to FIG.

The base station repeatedly transmits indication information or a paging message through a plurality of subframes or a plurality of radio frames including a paging opportunity (S830). The base station may transmit the indication information or the paging message repeatedly by using the method according to each embodiment of the present invention described above.

As described above, the present invention can prevent unnecessary repetition of paging for general terminals by distinguishing a paging frame or a paging opportunity of the enhanced MTC terminal for paging frames or paging opportunities for general terminals. Also, the present invention has the effect of preventing paging delay for general terminals by restricting unnecessary repetition. In addition, the present invention provides an effect of preventing loss of data when the MTC terminal receives a paging message from a base station. In addition, the present invention distinguishes the paging between the general terminal and the MTC terminal, thereby providing an effect that the MTC terminal can smoothly receive the paging message. In addition, the present invention provides an effect of preventing a problem that a general terminal repeatedly receives a paging message unnecessarily.

9 and 10, the configuration of a terminal and a base station to which the present invention can be fully performed will be described.

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

9, the MTC terminal 900 according to another embodiment of the present invention includes a controller 910 for monitoring a plurality of paging occasions per DRX (Discontinuous Reception) cycle, and a controller 910 for monitoring a paging occasion And a receiver 930 for repeatedly receiving information or a paging message through a plurality of subframes or a plurality of radio frames.

The control unit 910 needs to monitor the paging opportunity to receive the paging message. For this, the controller 910 monitors the paging opportunity, which may include the paging message, by referring to Equations 1 and 2 described above. However, in the case of a general terminal, one paging opportunity is monitored in one DRX cycle. Since the MTC terminal can repeatedly receive a facsimile message, the controller 910 must monitor a plurality of paging opportunities. The controller 910 may monitor a radio frame or a subframe that is different from a paging opportunity of a general terminal in monitoring a plurality of paging opportunities in one DRX cycle. For this purpose, the controller 910 may use a different equation to calculate the paging opportunity to be monitored, which is different from the above equations (1) and (2). Alternatively, a mathematical expression similar to Equations 1 and 2 may be used. For example, using the same equation, new paging parameters other than the paging parameters for the general terminal can be received and used through the system information.

The receiving unit 930 may receive a paging opportunity through a plurality of radio frames or subframes.

For example, a plurality of radio frames including the above-described instruction information or a paging message may be a radio frame not overlapping with a radio frame including a paging message of a general terminal monitoring only one paging opportunity per DRX cycle. The radio frame including the paging opportunity of the general terminal and the radio frame including the paging opportunity of the MTC terminal can be calculated so as not to overlap. Through this, the paging message of the general terminal and the MTC terminal can be transmitted and received separately.

As another example, a plurality of subframes including the above-described indication information or a paging message may be a subframe that does not overlap with a subframe including a paging message of a general terminal monitoring only one paging opportunity per DRX cycle. The subframe in the radio frame including the paging opportunity of the general terminal can be calculated so as not to be overlapped with the subframe including the paging opportunity of the MTC terminal. Through this, the paging message of the general terminal and the MTC terminal can be transmitted and received separately. In this case, the radio frame including the paging opportunity for the MTC terminal may overlap with the general terminal, but the subframes in the radio frame may not overlap. Or a paging opportunity for the MTC terminal may not overlap with the general terminal.

As another example, the P-RNTI (Paging Radio Network Temporary Identity) of the general terminal and the MTC terminal can be distinguished. That is, the P-RNTI of the general terminal and the P-RNTI of the MTC terminal can be determined to be different values and can be distinguished. The instruction (addressing) information indicating the above-described paging message is transmitted through the PDCCH, and the PDCCH is scrambled based on the P-RNTI. Therefore, when the P-RNTI of the MTC terminal and the P-RNTI of the general terminal are distinguished, the PDCCH to which the indication information is transmitted can be distinguished. The MTC terminal can receive paging messages separately.

As another example, the scheduling information indicating the paging message for the MTC terminal may be distinguished from the scheduling information for indicating the paging message for the general terminal, and transmitted to the terminal through the system information, so that the MTC terminal and the general terminal can distinguish the paging message have.

The receiving unit 930 can further receive the help information for receiving the paging message of the MTC terminal from the base station. The help information includes parameters for calculating a paging frame or paging opportunity for the MTC terminal, a number of repetitions of the PDCCH / EPDCCH addressing the paging message for the MTC terminal, a starting paging frame, an ending paging frame, And a parameter (e.g., nB) for deriving an ending sub-frame, a paging cycle of the MTC terminal, a coverage level of the MTC terminal, and a paging frame / paging opportunity of the MTC terminal. As another example, the above-described help information may include scheduling information of the PDCCH / EPDCCH indicating the paging message for the MTC terminal. As another example, the paging message transmission of the MTC terminal may be transmitted via a fixed scheduling information or a pattern of indicated scheduling information via system information, which is not scheduled by PDCCH or EPDCCH. In this case, the help information includes a start paging frame, an end paging frame, a paging opportunity start sub frame, a paging opportunity end sub frame, a paging cycle of the MTC terminal, a coverage level of the corresponding MTC terminal, an MTC An MTC terminal paging frame for receiving a paging message of the terminal, and a parameter (for example, nB) for deriving a paging opportunity of the MTC terminal.

 Receiver 930 may receive help information as system information or higher layer signaling.

In addition, the receiver 930 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 910 controls the overall operation of the terminal according to the reception of the paging of the MTC terminal, which is necessary for performing the above-described present invention, from the general terminals.

Also, the transmitter 920 transmits uplink control information, data, and a message to the base station through the corresponding channel.

10 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

Referring to FIG. 10, a BS 1000 according to another embodiment of the present invention includes a controller 1010 for calculating a plurality of paging opportunities for transmitting indication information and a paging message indicating a paging message for an MTC terminal, And a transmitter 1020 that repeatedly transmits indication information or a paging message through a plurality of subframes or a plurality of radio frames including a paging opportunity.

The control unit 1010 can calculate the paging opportunity of the MTC terminal and the general terminal separately. The control unit 1010 can calculate the paging opportunity according to each embodiment with reference to Equations (1) to (6).

For example, the controller 1010 may calculate the plurality of radio frames including the paging opportunity not to overlap with the radio frame including the paging message of the general terminal that calculates only one paging opportunity.

As another example, the control unit 1010 may calculate the plurality of subframes including the paging opportunity not to be overlapped with the subframe including the paging message of the general terminal that generates only one paging opportunity.

In addition, the controller 1010 controls the overall operation of the base station according to transmission of the paging of the MTC terminal, which is necessary for performing the above-described present invention, from general terminals.

The transmitter 1020 may repeatedly transmit indication information or a paging message through a plurality of subframes including a paging opportunity or a plurality of radio frames. The indication information may be included in a Physical Downlink Control Channel (PDCCH) or an EPDCCH scrambled based on a P-RNTI different from a P-RNTI of a general terminal that calculates only one paging opportunity.

The transmission unit 1020 transmits scheduling information indicating a paging message for the MTC terminal to scheduling information indicating a paging message for the general terminal through the system information and transmits the scheduling information to the terminal so that the MTC terminal and the general terminal can distinguish the paging message .

The transmitting unit 1020 may further transmit the help information for receiving the paging message of the MTC terminal to the MTC terminal.

In addition, 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 to and from the MTC terminal.

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 (20)

A method of receiving a paging message by a MTC (Machine-Type Communication)
Monitoring a plurality of paging occasions per discontinuous reception (DRX) cycle; And
The method comprising repeatedly receiving indication information indicating a paging message or the paging message through a plurality of subframes or a plurality of radio frames. The method according to claim 1,
The plurality of radio frames including the instruction information or the paging message,
Wherein the wireless frame is a wireless frame that does not overlap with a wireless frame including a paging message of a general terminal monitoring only one paging opportunity per the DRX cycle. The method according to claim 1,
A plurality of subframes including the indication information or the paging message,
Wherein the paging message is a subframe that does not overlap with a subframe including a paging message of a general terminal monitoring only one paging opportunity per the DRX cycle. The method according to claim 1,
Further comprising receiving from the base station assistance information for receiving a paging message of the MTC terminal. 5. The method of claim 4,
The help information includes:
And scheduling information for a paging message of the MTC terminal through scheduling information or system information for a control channel indicating a paging message of the MTC terminal. A method for a base station to transmit a paging message,
Calculating direction information indicating a paging message for a MTC (Machine-Type Communication) terminal and a plurality of paging opportunities for transmitting the paging message; And
And repeatedly transmitting the indication information or the paging message through a plurality of subframes or a plurality of radio frames including the paging opportunity. The method according to claim 6,
Wherein the plurality of radio frames, including the paging opportunity,
Wherein the wireless frame is calculated so as not to overlap with a wireless frame including a paging message of a general terminal that calculates only one paging opportunity. The method according to claim 6,
A plurality of subframes including the paging opportunity,
Wherein the paging message is a subframe calculated so as not to overlap with a subframe including a paging message of a general terminal that calculates only one paging opportunity. The method according to claim 6,
And transmitting assistance information for receiving a paging message of the MTC terminal to the MTC terminal. 10. The method of claim 9,
The help information includes:
And scheduling information for a paging message of the MTC terminal through scheduling information or system information for a control channel indicating a paging message of the MTC terminal. A MTC (Machine-Type Communication) terminal for receiving a paging message,
A controller for monitoring a plurality of paging occasions per DRX (Discontinuous Reception) cycle; And
And a receiver for repeatedly receiving the indication information indicating the paging message or the paging message through a plurality of subframes or a plurality of radio frames. 12. The method of claim 11,
The plurality of radio frames including the instruction information or the paging message,
And a wireless frame including a paging message of a general terminal monitoring only one paging opportunity per DRX cycle. 12. The method of claim 11,
A plurality of subframes including the indication information or the paging message,
And a paging message of a general terminal monitoring only one paging opportunity per the DRX cycle. 12. The method of claim 11,
The receiver may further comprise:
And further receiving assistance information for receiving a paging message of the MTC terminal from a base station. 15. The method of claim 14,
The help information includes:
And the scheduling information for the paging message of the MTC terminal through the scheduling information or the system information for the control channel indicating the paging message of the MTC terminal. A base station for transmitting a paging message,
A controller for generating instruction information for indicating a paging message for a MTC (Machine-Type Communication) terminal and a plurality of paging opportunities for transmitting the paging message; And
And a transmitter for repeatedly transmitting the indication information or the paging message through a plurality of subframes or a plurality of radio frames including the paging opportunity. 17. The method of claim 16,
Wherein the plurality of radio frames, including the paging opportunity,
Wherein the base station is a radio frame calculated so as not to overlap with a radio frame including a paging message of a general terminal that calculates only one paging opportunity. 17. The method of claim 16,
A plurality of subframes including the paging opportunity,
A base station that is calculated so as not to overlap with a subframe including a paging message of a general terminal that calculates only one paging opportunity. 17. The method of claim 16,
The transmitter may further comprise:
And further transmits help information for receiving a paging message of the MTC terminal to the MTC terminal. 20. The method of claim 19,
The help information includes:
The scheduling information for the paging message of the MTC terminal through the scheduling information or the system information for the control channel indicating the paging message of the MTC terminal.

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