KR20160091491A - Apparatus and method of downlink data channel reception of MTC UEs - Google Patents

Apparatus and method of downlink data channel reception of MTC UEs Download PDF

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Publication number
KR20160091491A
KR20160091491A KR1020150011248A KR20150011248A KR20160091491A KR 20160091491 A KR20160091491 A KR 20160091491A KR 1020150011248 A KR1020150011248 A KR 1020150011248A KR 20150011248 A KR20150011248 A KR 20150011248A KR 20160091491 A KR20160091491 A KR 20160091491A
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South Korea
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pdsch
rnti
method
reception
downlink
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KR1020150011248A
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Korean (ko)
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박규진
최우진
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주식회사 케이티
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

The present invention relates to a Downlink Control Information (DCI) transmission / reception method for a UE supporting a low complexity UE category / type or coverage enhancement operation for a MTC (Machine Type Communication) operation in a 3GPP LTE / LTE- And a method of transmitting and receiving a Physical Downlink Shared CHannel (PDSCH). In particular, a method for receiving downlink data in an MTC terminal includes receiving PDSCH scheduling information from a base station; And receiving a PDSCH based on the PDSCH scheduling information. When a plurality of PDSCH scheduling information are simultaneously received through a plurality of downlink subframes, a reception priority based on the type of the RNTI for which the PDSCH scheduling is performed is determined A method and an apparatus for performing the method.

Description

[0001] The present invention relates to a method and apparatus for receiving a downlink data channel of a MTC terminal,

The present invention relates to a Downlink Control Information (DCI) transmission / reception method for a UE supporting a low complexity UE category / type or coverage enhancement operation for a MTC (Machine Type Communication) operation in a 3GPP LTE / LTE- And a method of transmitting and receiving a Physical Downlink Shared CHannel (PDSCH).

In the present invention, a certain MTC terminal receives a plurality of DCIs each including PDSCH scheduling information through CSS or USS configured through the same downlink subframe. However, due to the limitation of the reception bandwidth of the corresponding MTC terminal, Simultaneous reception on the PDSCH may not be possible. In the present invention, a method of defining a PDSCH reception operation of the MTC terminal is proposed in consideration of this. In particular, when a plurality of PDSCH scheduling information is simultaneously received through an arbitrary downlink subframe or a plurality of downlink subframes, a method for determining a reception priority based on the type of RNTI to which the PDSCH scheduling is performed will be proposed.

1 is a diagram showing an embodiment of a PDSCH receivable band of a low-priced MTC terminal.
2 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
3 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. 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 megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, Quot;

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, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

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

In a system such as LTE and LTE-A, the uplink and downlink are configured based on 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 transmission / reception 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 multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex 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.

PDCCH and EPDCCH are defined as downlink physical control channels for transmitting downlink control information (DCI) for a UE in the conventional 3GPP LTE / LTE-A system. A certain LTE / LTE-A terminal monitors the UE-specific Search Space (USS) defined in the PDCCH or the EPDCCH and the CSS defined in the PDCCH, thereby generating UE-specific downlink control information scrambled with the C- And cell specific downlink control information scrambled with SI-RNTI, P-RNTI, and RA-RNTI. Specifically, in case of UE-specific DCI including scheduling information for a UE-specific uplink / downlink data channel, CRC scrambling is performed on the C-RNTI of the corresponding UE, and USS and cell-specific search space CSS, and the UE monitors the CSS and the USS to receive the UE-specific DCI and the UE-specific PDSCH for the corresponding UE. In the case of a cell-specific DCI including scheduling information for system information (SIBs) and paging messages and Random Access Response (RAR) messages transmitted through the PDSCH for a UE in the corresponding cell The UEs in the corresponding cell transmit the SIBs, the paging message, and the RAR scheduling information by monitoring the CSS, respectively, by CRC scrambling with SI-RNTI, P-RNTI and RA- And the corresponding SIBs, the paging message, and the PDSCH to which the RAR is transmitted.

Specifically, for the PDCCH / EPDCCH monitoring operation of the terminal defined in the existing LTE / LTE-A system, the contents of the standard specification document TS36.213 should be extracted and appended to appendix [1] below.

[ Low complexity UE category / type for MTC operation ]

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

To solve this problem, it is necessary to replace a cheap MTC terminal using a GSM / EGPRS network with an MTC terminal using an LTE network. To achieve this, a low complexity UE category that reflects various requirements for lowering the price of an LTE MTC terminal There is a need for the definition of / type and the need for standard techniques to support it.

In addition, about 20% of MTC terminals supporting MTC services such as smart metering are installed in a 'Deep indoor' environment such as a basement. Therefore, for successful MTC data transmission, the coverage of LTE MTC terminals is compared with the coverage of conventional LTE terminals It should be improved by about 15 dB. Also, if the performance degradation due to introduction of the low complexity UE category / type for the MTC operation is additionally considered, the coverage of the LTE MTC terminal should be improved by more than 15dB.

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

Specifically, the requirements of low complexity UE category / type for MTC operation are as follows.

  Reduced UE bandwidth of 1.4 MHz in downlink and uplink.

    ◆ Bandwidth reduced UEs should be able to operate within any system bandwidth.

    ◆ Frequency multiplexing of bandwidth reduced UEs and non-MTC UEs should be supported.

    ◆ The UE only needs to support 1.4 MHz RF bandwidth in downlink and uplink.

  ■ Reduced maximum transmit power.

  Reduced support for downlink transmission modes.

  ● further UE processing relaxations

    ◆ Reduced maximum transport block size for unicast and / or broadcast signaling.

    ◆ Reduced support for simultaneous reception of multiple transmissions.

    ◆ Relaxed transmit and / or receive EVM requirements including restricted modulation scheme. Reduced physical control channel processing (e.g., reduced number of blind decoding attempts).

    Reduced physical data channel processing (e.g., relaxed downlink HARQ time line or reduced number of HARQ processes).

    ◆ Reduced support for CQI / CSI reporting modes.

  ● Target a relative LTE coverage improvement? corresponding to 15 dB for FDD - for the UE category / type defined above and other UEs operating delay tolerant MTC applications with respect to their respective nominal coverage.

● Provide power consumption reduction for the UE category / type defined above, both in normal coverage and enhanced coverage, to target ultra-long battery life:

In the present invention, for convenience of description, the existing LTE terminal is referred to as a normal LTE terminal, and a new low complexity UE category / type satisfying the above conditions for the MTC operation will be simply referred to as an MTC terminal. Also, the normal LTE terminal or the MTC terminal supporting the coverage enhancement function or mode is referred to as a CE (coverage enhanced) terminal.

According to the conventional downlink data channel transmission / reception method, in the case of an LTE / LTE-A terminal connected to an arbitrary base station / cell, reception performance for a 20 MHz frequency bandwidth is guaranteed regardless of the operating frequency bandwidth, There is no restriction on the scheduling for a plurality of PDSCHs including different information through a frame and accordingly reception for a plurality of PDSCHs. However, as described above, in the case of the MTC mobile station, six consecutive PRBs (Physical Resource Blocks) are transmitted to a PDSCH transmitted / received through a plurality of downlink subframes for a single downlink subframe or CE due to a restriction on a reception bandwidth, Lt; RTI ID = 0.0 > PDSCH < / RTI > Accordingly, when a plurality of DCIs including PDSCH scheduling information for transmitting different types of data to / from an arbitrary MTC terminal in a CSS or USS configured through an arbitrary DL subframe are transmitted and received, It is necessary to define a receiving method of the MTC terminal with respect to the PDSCH of FIG.

In the present invention, a certain MTC terminal receives a plurality of DCIs each including PDSCH scheduling information through CSS or USS configured through the same downlink subframe. However, due to the limitation of the reception bandwidth of the corresponding MTC terminal, Simultaneous reception on the PDSCH may not be possible. In the present invention, a method of defining a PDSCH reception operation of the MTC terminal is proposed in consideration of this. In particular, when a plurality of PDSCH scheduling information is simultaneously received through an arbitrary downlink subframe or a plurality of downlink subframes, a method for determining a reception priority based on the type of RNTI to which the PDSCH scheduling is performed will be proposed.

1 is a diagram showing an embodiment of a PDSCH receivable band of a low-priced MTC terminal.

As described above, in case of the low-priced MTC terminal, when the system bandwidth of the cell to which the corresponding terminal belongs is larger than 1.4 MHz, unlike the normal LTE terminal as shown in FIG. 1, Simultaneous reception on a plurality of transmitted PDSCHs may not be possible.

In the case of a MTC terminal that can not receive a plurality of PDSCHs through the same downlink subframe differently from an existing LTE terminal, when receiving a plurality of PDSCH scheduling information through the same downlink subframe, a reception operation for the corresponding PDSCH is defined There is a need.

In the present invention, by defining the PDSCH reception priority for the MTC terminal, the MTC terminal proposes a method of operating without ambiguity in receiving the PDSCH.

Scrambled RNTI-based PDSCH Reception Prioritization Method

According to the downlink resource allocation method and the downlink control channel monitoring method defined in the existing LTE system, in the case of a terminal connected to a certain cell, SIB, RAR, paging message and unicast for the corresponding terminal It is defined to monitor the DCI containing the PDSCH resource allocation information for data transmission and to monitor the DCI containing the PDSCH resource allocation information for the unicast data transmission for the corresponding terminal through the USS. In this case, the DCI including the scheduling information of the SIB is scrambled with the SI-RNTI, and the DCI including the scheduling information of the RAR is transmitted by the RA-RNTI, and the DCI including the scheduling information for the paging message is transmitted by the P- And the DCI including the scheduling information for the unicast data for the UE is CRC scrambled in the C-RNTI of the corresponding UE. That is, the scrambling RNTI of the DCI including the corresponding scheduling information differs according to the type of data transmitted through the corresponding PDSCH.

In the PDSCH reception operation scheme proposed by the present invention, when a certain MTC terminal receives a plurality of DCIs including different PDSCH allocation information through the same downlink subframe, the CRC scrambling of each corresponding DCI is performed And determine the priority of the PDSCH according to the RNTI.

For example, when a certain MTC mobile station scrambled with SI-RNTI including PDSCH scheduling information for SIB transmission through the same downlink subframe and PDSCH scheduling information for unicast data information transmission for the corresponding MTC mobile station When a DCI scrambled with a C-RNTI is received, a PDSCH to be received by the corresponding MTC terminal is selected based on the type of data transmitted by each PDSCH, that is, the type of RNTI scrambled by each DCI .

RNTI, P-RNTI, and RA-RNTIs transmitted through CSS, rather than a PDSCH allocated by a DCI scrambled with a C-RNTI through USS, as a PDSCH reception priority rule based on a DCI scrambled RNTI, RNTI and the PDSCH allocated by the DCI scrambled with the C-RNTI. However, when a plurality of PDSCHs scrambled with different RNTIs are allocated through the same CSS, the lowest priority is applied to the C-RNTI scrambled PDSCH. In the case of priority between P-RNTI, SI-RNTI and RA-RNTI, the PDSCH by SI-RNTI may be received first, followed by P-RNTI and RA-RNTI. That is, the PDSCH reception priority for a plurality of PDSCH allocations according to the present embodiment is determined based on the PDSCH> P-RNTI PDSCH> RA-RNTI PDSCH> CSS CSI RNTI PDSCH> USS And the PDSCH according to the C-RNTI transmitted to the UE.

RNTI based on a DCI scrambled RNTI, a SI-RNTI, a P-RNTI, and a P-RNTI transmitted through a CSS, rather than a PDSCH allocated by a DCI scrambled with a C-RNTI through USS, , RA-RNTI, and PDSCH allocated by DCI scrambled with C-RNTI. Also, when a plurality of PDSCHs scrambled with different RNTIs are allocated through the same CSS, the lowest priority is applied to the C-RNTI scrambled PDSCH. In the case of priority between P-RNTI, SI-RNTI and RA-RNTI, PDSCH based on P-RNTI, PDSCH based on SI-RNTI, and PDSCH based on RA-RNTI can be defined in order of priority . PDSCH reception priority for a plurality of PDSCH allocations according to the present embodiment is transmitted by PDSCH> SI-RNTI by PDSCH> RA-RNTI by P-RNTI> PDSCH> by PDSCH> USS by C-RNTI transmitted by CSS And a PDSCH based on the C-RNTI.

RNTI> SI-RNTI> RA-RNTI> SI-RNTI> RA-RNTI> SI-RNTI in the case of priority among the P-RNTI, SI-RNTI and RA- > P-RNTI.

However, in the above case, since any MTC terminal may not monitor the SI-RNTI, RA-RNTI, P-RNTI and C-RNTI through all the CSSs configured in the cell, the priority rule is monitored by the corresponding MTC terminal And may be applied only to CSS and USS of the set downlink subframe.

In addition, the present invention is not limited to the priority according to the above embodiment, and may include all cases in which the PDSCH reception priority order is defined based on the RNTI scrambled by the DCI including the PDSCH allocation information.

In addition, the present invention is not limited to CSS and USS configured through a single downlink subframe, but can be equally applied to a case where CSS and USS are configured through a plurality of downlink subframes for CE.

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

2, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

When a terminal required to perform the above-described present invention receives a plurality of PDSCH scheduling information through a downlink subframe or a plurality of downlink subframes at the same time, the controller 1010 transmits the PDSCH scheduling information to the RNTI And controls the overall operation of the base station according to the determination of the reception priority based on the type.

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 terminal.

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

3, a user terminal 1100 according to another embodiment of the present invention includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

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

In addition, when a plurality of PDSCH scheduling information is simultaneously received through an arbitrary downlink subframe or a plurality of downlink subframes necessary for performing the above-described present invention, the controller 1120 determines the type of the RNTI to which the corresponding PDSCH scheduling is performed And controls the overall operation of the terminal according to the determination of the reception priority based on the received priority.

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

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

In addition, reference materials submitted together with the present specification are intended to aid understanding of the present invention, and the contents of the reference materials are also a part of the present invention. Accordingly, it is to be understood that the present invention is not limited to the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention.

1. Reference document: A standard document on the physical downlink shared channel

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 (1)

  1. A method for receiving downlink data in an MTC terminal,
    Receiving PDSCH scheduling information from a base station; And
    And receiving a PDSCH based on the PDSCH scheduling information,
    A method for determining a reception priority based on a type of an RNTI to which PDSCH scheduling is performed when a plurality of PDSCH scheduling information is simultaneously received through a plurality of downlink subframes.
KR1020150011248A 2015-01-23 2015-01-23 Apparatus and method of downlink data channel reception of MTC UEs KR20160091491A (en)

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