KR20130054172A - Method for supporting the machine type communication and apparatus performing thereof - Google Patents

Abstract

PURPOSE: A machine-to-machine communications supporting method and device are provided to support an efficient machine-to-machine communications service in a 3GPP(Third Generation Partnership Project) LTE(Long-Term Evolution)-based mobile communications system while maintaining compatibility with a legacy LTE terminal. CONSTITUTION: A machine-to-machine communications terminal(200) includes a control part(210) and a transmission/reception part(220). The control part detects the number of OFDM(Orthogonal Frequency Division Multiplexing) symbols occupied by a legacy PDCCH(Physical Downlink Control Channel) in a downlink channel sub-frame received from a base station through the transmission/reception part. The control part determines the number of OFDM symbols occupied by a legacy PDCCH based on extracted CFI(Control Format Indicator) information bits for a legacy terminal. The transmission/reception part receives a downlink sub-frame from a base station and provides to the control part. [Reference numerals] (210) Control part; (220) Transmission/reception part

Description

METHOD FOR SUPPORTING THE MACHINE TYPE COMMUNICATION AND APPARATUS PERFORMING THEREOF}

The present invention relates to an IoT communication support, and more particularly, to an IoT communication support method and apparatus for providing an efficient IoT communication service in a 3GPP LTE-based mobile communication system.

Machine type communication or machine to machine communication refers to a form of data communication associated with one or more entities for which human intervention is not essential.

Services optimized for telecommunications differ from services optimized for human-to-human communications, including: a) different market scenarios, b) data communications, c) lower cost and effort, and d) a very large number of potential communications. Terminals, e) differ from current mobile network communications in that they relate to characteristics such as very little traffic per terminal, up to a large range.

IoT can appear in various forms of services, for example, smart metering, tracking & tracing, remote maintenance & control, eHealth, and the like.

Currently, the 3rd Generation Partnership Project (3GPP) is using the separate terminology of Mt.

Hereinafter, in the present invention, a terminal supporting Long Term Evolution (LTE) and LTE-Advanced in 3GPP standard Rel-8 / 9/10 to distinguish from a user equipment (UE) discussed in the present invention is legacy ( Legacy) Called LTE terminal.

In Rel-8 / 9/10, legacy LTE terminals are defined in the specification to support transmit and receive bandwidth of up to 20 MHz. The MTC terminal may have a narrower bandwidth than the system bandwidth of the base station because it aims to support low cost and low data rate.

In Rel-8 / 9/10, the PBCH (Physical Broadcast Channel) channel, which transmits the synchronization signal, that is, the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the system information, is transmitted in the 1.08 MHz bandwidth based on the center frequency of the system bandwidth. do.

Here, since 1.08 MHz is the same as the bandwidth excluding both guard bands at 1.4 MHz, which is the smallest system bandwidth, the MTC terminal can receive the PSS / SSS / PBCH even if the bandwidth is narrower than the system bandwidth of the base station.

However, the legacy physical downlink control channel (PDCCH) channel, which is a control channel, a physical control format indicator channel (PCFICH) channel that transmits the number of OFDM symbols occupied by the legacy PDCCH channel, and a physical uplink shared channel (PUSCH) PHICH (Physical HARQ Indicator Channel) channel for transmitting the ACK / NACK information is transmitted over the entire system bandwidth, there is a problem that the MTC terminal having a bandwidth narrower than the system bandwidth of the base station can not receive such channels correctly.

An object of the present invention for solving the above problems is to provide a method for supporting communication of things that can provide an efficient thing communication service.

Another object of the present invention is to provide an apparatus for performing the MTC support method.

According to the MTC support method according to an embodiment of the present invention for achieving the above object, in the MTC support method performed in the base station, the physical downlink between the base station and the terminal for transmitting data to the MTC terminal Allocating physical channels of the MTC terminal including information on the number of OFDM symbols occupied by the white physical control channel of the UE in a shared channel region and transmitting a subframe to which the physical channels of the MTC terminal are allocated Steps.

In addition, according to the MTC support method according to an embodiment of the present invention for achieving another object of the present invention, in the MTC support method performed in the MTC terminal, receiving a subframe from the base station and the reception Detecting an area occupied by the downlink physical control channel of the terminal in the received subframe.

In addition, according to the base station for performing the M2 supporting method according to an embodiment of the present invention for achieving another object of the present invention, a downlink physical shared channel between the base station and the terminal for transmitting data to the M2 terminal And a frame constructing unit for allocating physical channels of the MTC terminal to an area, and a communication unit transmitting a subframe to which the physical channels of the MTC terminal are allocated.

In addition, according to the MTC terminal performing the MTC support method according to an embodiment of the present invention for achieving another object of the present invention, the transceiver for receiving a subframe from the base station and the terminal in the received subframe And a control unit for detecting an area occupied by the downlink physical control channel of.

According to the MTC support method and apparatus according to the embodiment of the present invention as described above, the base station cyclically shifts a predetermined MTC-PCFICH code according to CFI to allocate a physical channel for the MTC terminal, The UE may detect the number of OFDM symbols occupied by the legacy PDCCH channel through an implicit method or an explicit method.

Therefore, while maintaining compatibility with the legacy LTE terminal, it is possible to support efficient IoT service in the 3GPP LTE-based mobile communication system.

1 illustrates a frame structure for MFC-PCFICH channel allocation according to an embodiment of the present invention.
2 illustrates a frame structure for resource region allocation occupied by a Telecommunications PDCCH and a legacy PDCCH according to an embodiment of the present invention.
3 is a flowchart illustrating a process of detecting the number of OFDM symbols occupied by the legacy PDCCH according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating in detail a step of detecting the number of OFDM symbols occupied by the legacy PDCCH of FIG. 3.
5 is a conceptual diagram illustrating that the MTC-PCFICH symbol position is differently allocated in the frequency domain according to the CFI.
6 is a conceptual diagram illustrating that the MTC-PCFICH symbol location is differently allocated in the time domain according to the CFI.
FIG. 7 is a conceptual diagram illustrating determining an area occupied by a legacy PDCCH according to a location where a MTC-PCFICH symbol location is detected.
FIG. 8 is a flowchart illustrating a process of determining the number of symbols occupied by the legacy PDCCH through a method by the MTC terminal in accordance with another embodiment of the present invention.
9 is a block diagram illustrating a configuration of a base station for supporting M2T according to an embodiment of the present invention.
10 is a block diagram illustrating a configuration of an MTC terminal for supporting MTC according to an embodiment of the present invention.
FIG. 11 illustrates a frame structure for processing when channel areas of the MTC terminal and the legacy LTE terminal overlap.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

Hereinafter, the terms used in the present invention will be summarized. First, the downlink physical channel names for legacy LTE terminals specified in the 3GPP LTE-based radio transmission standard are as follows.

PCSCH channel: a downlink physical channel for transmitting data for legacy LTE terminal

Legacy PDCCH channel: physical channel for transmitting control information for demodulation of PDSCH channel

PCFICH channel: physical channel transmitting the number of OFDM symbols occupied by the legacy PDCCH channel

PHICH channel: a physical channel for transmitting ACK / NACK information on an uplink data channel (PUSCH)

In addition, in the present invention, the downlink physical channel name for the MTC terminal is summarized as follows.

-Object communication-PDSCH channel: physical channel for transmitting the downlink data communication

-Object communication-PDCCH channel: physical channel for transmitting control information for demodulation of the object communication-PDSCH channel

-Object Communication-PCFICH Channel: The number of OFDM symbols in the time domain or the number of RBs (Resource Blocks) or subcarriers in the frequency domain occupied by the IoT-PDCCH channel, or a group of several RBs or several subcarriers. In case of doing this, the physical channel transmitting the number of bundles

-Object communication-PCFICH channel: physical channel for transmitting the ACK / NACK information for the MTC uplink data channel

In the present specification, embodiments of the present invention will be described based on resource allocation for data transmission and reception between a base station and a MTC terminal.

Here, the base station has a meaning as a terminal node of a network that directly communicates with the MTC terminal. Certain operations described herein as being performed by a base station may in some cases be performed by an upper node of the base station.

That is, various operations performed for communication with a terminal in a network consisting of a plurality of network nodes including a base station may be performed by a base station or a network node other than the base station.

Here, the base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the station may be replaced with terms such as a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), or a mobile terminal.

In addition, the transmitting end refers to a node transmitting data or voice service, and means a node receiving data or voice service of the receiving end. Therefore, in uplink, a terminal may be a transmitting end and a receiving end of a base station. Similarly, in the downlink, the terminal may be the receiving end and the base station may be the transmitting end.

On the other hand, MTS terminal, legacy LTE terminal of the present invention PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, GSM (Global System for Mobile) phone, WCDMA (Wideband CDMA) phone, MBS ( Mobile Broadband System) phones and the like can be used.

Embodiments of the invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

In the case of a hardware implementation, another method according to embodiments of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs). Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

1 illustrates a frame structure for MFC-PCFICH channel allocation according to an embodiment of the present invention.

Referring to FIG. 1, a specific section of a subframe corresponds to a legacy PDCCH used by a base station to transmit control information to a legacy LTE terminal.

Here, the legacy PDCCH may consist of 1 to 3 symbols, or may consist of 3 or more symbols.

The base station may allocate the M2C-PDCCH, the M2C-PDSCH, the M2C-PCFICH for the M2C to the PDSCH region of the subframe excluding the legacy PDCCH interval.

Here, the MTC-PCFICH symbols may be frequency hopped with different frequency resources in the MTC-PDCCH region to obtain a frequency diversity effect. Meanwhile, the frequency hopping pattern may be different for each subframe or slot. In addition, according to another embodiment of the present invention, the MTC-PCFICH symbols may be allocated to the same frequency band without frequency hopping.

2 illustrates a frame structure for resource region allocation occupied by a Telecommunications PDCCH and a legacy PDCCH according to an embodiment of the present invention.

Referring to FIG. 2, the base station may include a Telecommunications-PCFICH code including information on the number of OFDM symbols (time domain) or RB (resource block) / subcarrier / package (frequency domain) occupied by the Telecommunications-PDCCH. In a given case, the MTC-PCFICH is allocated using a cyclic shifted MTC-PCFICH code according to a control format indicator (CFI) which is information on the number of OFDM symbols occupied by the legacy PDCCH.

Here, the cyclic shift method may include not only shifting the MTC-PCFICH code in the most significant bit direction as in FIG. 2 but also shifting the MCT-PCFICH code in the least significant bit direction. In addition, the length of a cyclic shifted symbol or bit may be constant or may vary with CFI.

Here, CFI is 2-bit information indicating the number of OFDM symbols in which the legacy PDCCH is located in the corresponding subframe. In addition, the IoT communication CFI includes the number of OFDM symbols in the time domain occupied by the IoT-PDCCH transmitted by the IoT-PCFICH channel, the number of resource blocks in the frequency domain, the number of subcarriers, the number of bundles of resource blocks and subcarriers, and the like. Information.

According to the method for supporting MTC according to an embodiment of the present invention, the base station cyclically shifts the MTF-PCFICH code given in advance in an implicit manner according to the CFI for the legacy LTE terminal. Although described as allocating PCFICH, in another embodiment of the present invention, a control channel (eg, an MFI information bit for a legacy LTE terminal in a Explicit method) for a MTC terminal previously promised with the MTC terminal (eg, For example, it may be carried on a PCFICH.

Here, the base station performs joint coding on the CFI information for the legacy LTE terminal and the CFI (MTC-CFI) information for the MTC terminal in order to perform the expanded method. Can be sent to

Specifically, since the legacy LTE terminal has three CFIs of 1, 2, and 3, when the MTC terminal has N MTC-CFIs, a new codeword table for 3 ㅧ N CFI codewords is required. (For example, if the MTC-CFI has three values of 1, 2, and 3, then a CFI codeword table for 9 CFIs is required).

On the other hand, when the base station has allocated the resource for the M2 terminal by the implemented method described above, the M2 terminal needs to know the number of OFDM symbols occupied by the legacy PDCCH channel. Hereinafter, a method of detecting the number of OFDM symbols occupied by the legacy PDCCH (that is, the OFDM symbol position at which the MTC physical channels start in a subframe) will be described.

3 is a flowchart illustrating a process of detecting the number of OFDM symbols occupied by the legacy PDCCH according to an embodiment of the present invention.

Referring to FIG. 3, the MTC terminal receives a subframe of a downlink channel from a base station (S310).

Thereafter, the MTC detects the number of OFDM symbols occupied by the legacy PDCCH in the received subframe (S320).

In operation 320, the MTC terminal may detect the OFDM symbol position where the physical channels for the MTC terminal start by detecting the number of OFDM symbols occupied by the legacy PDCCH.

Hereinafter, a detailed method related to performing step 320 will be described.

FIG. 4 is a flowchart illustrating in detail a step of detecting the number of OFDM symbols occupied by the legacy PDCCH of FIG. 3.

Referring to FIG. 4, the MTC detects the MTC-PCFICH by performing blind decoding on a subframe received from the base station (S321).

The MTC detects the number of OFDM symbols occupied by the legacy PDCCH through the MTC-PCFICH detected in step 321 (S323).

For example, when the location of the ICT-PCFICH is allocated to the last OFDM symbol of the subframe, the MTC detects the ICT-PCFICH by performing blind decoding on the cyclic shift.

Here, it is assumed that the ICT-PCFICH is allocated using a cyclic shifted ICT-PCFICH code based on a CFI for a legacy LTE terminal when a predetermined ICT-PCFICH code is given.

The MTC terminal may determine the number of OFDM symbols occupied by the legacy PDCCH and the number of OFDM symbols occupied by the MTC-PDCCH based on the detected MTC-PCFICH.

In addition, referring to FIG. 5, the MTC terminal may detect the number of OFDM symbols occupied by the legacy PDCCH based on the detected MTC-PCFICH symbol positions allocated differently in the frequency domain according to the CFI. For example, if it is determined that the CFI is 1 according to the MTC-PCFICH symbol position, the MTC terminal may determine that the number of OFDM symbols occupied by the legacy PDCCH is one.

Alternatively, when the IoT communication-PDCCH region and the IoT communication-PDSCH region are divided into frequency division multiplexing (FDM), the IoT communication blind performs decoding on the cyclic shift to perform the IoT communication-PCFICH. Detect.

Here, it is assumed that the ICT-PCFICH is cyclically shifted based on the predetermined ICT-PCFICH code based on the CFI for the legacy LTE terminal.

The MTC terminal may determine the number of OFDM symbols occupied by the legacy PDCCH and the number of OFDM symbols occupied by the MTC-PDCCH based on the detected MTC-PCFICH.

In addition, referring to FIG. 6, the MTC terminal may detect the number of OFDM symbols occupied by the legacy PDCCH based on the detected MTC-PCFICH symbol positions allocated differently in the time domain according to the CFI. For example, if it is determined that the CFI is 1 according to the MTC-PCFICH symbol position, the MTC determines that the number of OFDM symbols occupied by the legacy PDCCH is one.

Or, if the location of the telecommunications-PCFICH is allocated to the OFDM symbol after the last OFDM symbol occupied by the PDCCH for the legacy LTE terminal, the specific OFDM symbol (for example, the first OFDM symbol of the subframe) Blind decoding is performed from the MTS-PCFICH.

Alternatively, in the case where the IoT communication-PDCCH region and the IoT communication-PDSCH region are divided into a time division multiplexing (TDM), the IoT communication blind performs decoding from the last symbol of the subframe. -Detect PCFICH. Referring to FIG. 7, when the MTC-PCFICH is detected by performing blind decoding on the second symbol at the end of the subframe, the MTC determines that the number of OFDM symbols occupied by the legacy PDCCH is two.

On the other hand, when the MTC-PDCCH region occupies from the OFDM symbol after the last OFDM symbol occupied by the PDCCH for the legacy LTE terminal, in the subframe 0, the MTC-PDCCH channel region is the use of a synchronization signal (PSS / SSS). Therefore, the last OFDM symbol available for MTE-PDCCH becomes the fourth OFDM symbol of the subframe.

For example, if the CFI is 2, if the number of resource blocks is greater than 10, the MFI-CFI has only a value of 1 or 2 (that is, the MFI-PDCCH region occupies only 1 or 2 OFDM symbols), and the resource If the number of blocks is 10 or less, the MTC-PDCCH region occupies only one OFDM symbol.

Here, the MTC-PCFICH symbols allocated to each OFDM symbol may be allocated in units of two or double adjacent subcarriers (symbols) for transmission diversity application. In addition, the Telecommunications-PCFICH symbols allocated to each OFDM symbol are allocated to all frequency bands or all time bands in the Telecommunications-PDCCH channel region in order to obtain a frequency diversity or time diversity effect in a frequency domain or a time domain in adjacent subcarriers. Can be sent over.

4 to 7, when the base station allocates the telecommunications-PCFICH by using the cyclic shifted telecommunications-PCFICH code based on the CFI information indicating the number of PDCCH symbols for the legacy LTE terminal, the telecommunications terminal performs blind decoding. Implemented method for detecting the CFI information was described.

Hereinafter, an explicit method in which the MTC terminal does not need to perform blind decoding according to another embodiment of the present invention will be described.

FIG. 8 is a flowchart illustrating a process of determining the number of symbols occupied by the legacy PDCCH through a method by the MTC terminal in accordance with another embodiment of the present invention.

Referring to FIG. 8, the MTC terminal demodulates and decodes a control channel for an MTC terminal allocated to a predetermined position among subframes received from the BS to extract CFI information bits for the legacy terminal (S325). .

Here, the control channel for the MTC terminal transmits to a fixed position (OFDM symbol position) in a subframe regardless of the number of PDCCH symbols (CFI value) for the legacy LTE terminal. Therefore, since the MTC terminal needs to demodulate and decode the control channel for the MTC terminal transmitted to a fixed position in the subframe, blind decoding may not be performed.

Thereafter, the MTC determines the number of OFDM symbols occupied by the legacy PDCCH based on the CFI information bits for the legacy UE extracted in step 325 (S327).

Here, the MTC terminal can know not only the number of OFDM symbols occupied by the MTC-PDCCH but also the number of OFDM symbols occupied by the legacy PDCCH using the CFI code word table.

Specifically, since the legacy LTE terminal has three CFIs of 1, 2, and 3, if the IoT terminal has N IoT-CFIs, a new code word table for 3 ㅧ N CFI code words is used (eg For example, if the IoT-CFI has three values of 1, 2, and 3, use the CFI code word table for 9 CFIs).

Accordingly, the MTC terminal may determine the number of OFDM symbols occupied by the MTC-PDCCH and the number of OFDM symbols occupied by the legacy-PDCCH based on the CFI included in the MTC-PCFICH channel information.

9 is a block diagram illustrating a configuration of a base station for supporting M2T according to an embodiment of the present invention.

Referring to FIG. 9, the base station 100 for supporting IoT communication according to an embodiment of the present invention may include a frame configuration unit 110 and a communication unit 120.

The frame configuration unit 110 may allocate the MTC-PDCCH, the MTC-PDSCH, and the MTC-PCFICH to the PDSCH region of the subframe excluding the legacy PDCCH interval.

Here, the MTC-PCFICH symbols may be frequency hopped with different frequency resources in the MTC-PDCCH region to obtain a frequency diversity effect. In addition, the frequency hopping pattern may be different for each subframe or slot. Telecommunications-PCFICH symbols may be assigned to the same frequency band without frequency hopping.

In more detail, the frame configuration unit 110 includes an MTC-PCFICH code including information on the number of OFDM symbols (time domain) or RB (resource block) / subcarrier / package (frequency domain) occupied by the MTC-PDCCH. If is given, MTC-PCFICH is allocated using a cyclic shifted MTC-PCFICH code according to a Control Format Indicator (CFI) which is information on the number of OFDM symbols occupied by the legacy PDCCH.

In addition, the frame configuration unit 110 loads the CFI information bits for the legacy LTE terminal to the control channel (for example, the IoT-PCFICH) for the MTC terminal previously promised with the MTC terminal in an expanded manner. You can also send.

In this case, the frame configuration unit 110 performs joint coding on CFI information for legacy LTE terminals and CFI (MTC-CFI) information for MTC terminals to perform an expanded method. Can be sent on the control channel.

The communication unit 120 transmits the subframe allocated by the frame configuration unit 110 to the MTC terminal.

10 is a block diagram illustrating a configuration of an MTC terminal for supporting MTC according to an embodiment of the present invention.

Referring to FIG. 10, the MTC terminal 200 for MTC support according to an embodiment of the present invention may include a controller 210 and a transceiver 220.

The control unit 210 receives a subframe of the downlink channel from the base station through the transceiver 220, and detects the number of OFDM symbols occupied by the legacy PDCCH in the received subframe.

In detail, the controller 210 performs blind decoding on the received subframe to detect the MTC-PCFICH, and detects the number of OFDM symbols occupied by the legacy PDCCH through the detected MTC-PCFICH.

For example, when the location of the ICT-PCFICH is allocated to the last OFDM symbol of the subframe, the controller 210 performs blind decoding on the cyclic shift to detect the ICT-PCFICH.

Here, it is assumed that the ICT-PCFICH is allocated using a cyclic shifted ICT-PCFICH code based on a CFI for a legacy LTE terminal when a predetermined ICT-PCFICH code is given.

In addition, the controller 210 may detect the number of OFDM symbols occupied by the legacy PDCCH based on the detected MTC-PCFICH symbol positions allocated differently in the frequency domain according to the CFI. For example, the controller 210 may determine that the number of OFDM symbols occupied by the legacy PDCCH is one when it is determined that the CFI is 1 according to the MTC-PCFICH symbol position.

Alternatively, when the M2O-PDCCH region and the M2PD-PDSCH region are divided into frequency division multiplexing (FDM), the controller 210 performs blind decoding on the cyclic shift to perform the ICT-PCFICH. Is detected.

In addition, the controller 210 may detect the number of OFDM symbols occupied by the legacy PDCCH based on the detected MTC-PCFICH symbol positions allocated differently in the time domain according to the CFI. For example, if it is determined that the CFI is 1 according to the MTC-PCFICH symbol position, the MTC determines that the number of OFDM symbols occupied by the legacy PDCCH is one.

Alternatively, when the location of the ICT-PCFICH is allocated to an OFDM symbol after the last OFDM symbol occupied by the PDCCH for the legacy LTE terminal, the controller 210 may determine a specific OFDM symbol (eg, the first OFDM symbol of the subframe). Blind decoding is performed to detect the MTF-PCFICH.

Alternatively, when the MTC-PDCCH region and the MTC-PDSCH region are divided into a time division multiplexing (TDM), the controller 210 performs blind decoding from the last symbol of the subframe. Detect communication-PCFICH.

Alternatively, the control unit 210 extracts CFI information bits for the legacy terminal by demodulating and decoding a control channel for an MTC terminal allocated to a predetermined position among subframes received from the base station.

Here, the control channel for the MTC terminal transmits to a fixed position (OFDM symbol position) in a subframe regardless of the number of PDCCH symbols (CFI value) for the legacy LTE terminal. Therefore, since the MTC terminal needs to demodulate and decode the control channel for the MTC terminal transmitted to a fixed position in the subframe, blind decoding may not be performed.

In addition, the controller 210 determines the number of OFDM symbols occupied by the legacy PDCCH based on the extracted CFI information bits for the legacy UE.

Here, the MTC terminal can know not only the number of OFDM symbols occupied by the MTC-PDCCH but also the number of OFDM symbols occupied by the legacy PDCCH using the CFI code word table.

The transceiver 220 may receive a downlink subframe from the base station and provide the downlink subframe to the controller 210.

FIG. 11 illustrates a frame structure for processing when channel areas of the MTC terminal and the legacy LTE terminal overlap.

Referring to FIG. 11, when a resource allocated to an MTC terminal does not use the entire area of the MTC-PDSCH, the base station may allocate a PDSCH for legacy LTE terminals to an area where the channel is not allocated.

That is, the MTC-PDCCH channel region is distributed over all resources allocated for the MTC terminal, but the MTC-PDSCH may not be allocated to the data region of the MTC terminal because the MTC terminal may not use the entire area. Unused resources may be allocated to PDSCH for legacy LTE terminals.

In addition, the base station punctures the legacy PDSCH when the legacy PDSCH overlaps with the MTC-PDCCH channel region.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

100: base station 110: frame configuration
120: communication unit 200: MTC terminal
210: control unit 220: transceiver

Claims (21)

In the MTC support method performed in the base station,
Allocating physical channels of the MTC terminal including information on the number of OFDM symbols occupied by the white physical control channel of the MS in a downlink physical shared channel region between the BS and the MS for transmitting data to the MTC terminal. Making; And
And transmitting a subframe to which physical channels of the MTC terminal are allocated. The method according to claim 1,
Allocating physical channels of the MTC terminal,
Cyclic shifting a predetermined MTC-physical control format indication channel code based on a control format indicator (CFI) for the terminal; And
And allocating an ICT-physical control format indication channel using the cyclic shifted IOT-physical control format indication channel code. The method according to claim 2,
The thing communication-physical control format indication channel code includes at least one of information on the number of OFDM symbols, the number of resource blocks (RBs), and the number of subcarriers occupied by the communication-down physical control channel. How to support communication. The method according to claim 1,
Allocating physical channels of the MTC terminal,
The joint communication of the CFI information of the terminal and the CFI information of the MTC terminal (Joint Coding) characterized in that included in the control channel of the pre-scheduled MTC terminal of the sub-frames and allocates. In the MTC support method performed in the MTC terminal,
Receiving a subframe from a base station; And
Detecting a region occupied by the downlink physical control channel of the terminal in the received subframe. The method according to claim 5,
Detecting the area occupied by the downlink physical control channel of the terminal in the received subframe,
Performing blind decoding on the received subframe to detect a telecommunications-physical control format indication channel; And
And detecting an area occupied by the downlink physical control channel of the terminal through the detected MTC-physical control format indication channel. The method of claim 6,
Detecting the MSO-physical control format indication channel by performing blind decoding on the received subframe,
And performing a blind decoding on a cyclic shift (Cyclic shift) for a control format indicator (CFI) for the terminal included in the received subframe to detect the MTC-physical control format indication channel. How to support communication. The method of claim 7,
Detecting an area occupied by the downlink physical control channel of the terminal through the detected MTC-physical control format indication channel,
And detecting the area occupied by the downlink physical control channel of the terminal based on the different symbol positions of the detected MTC-physical format format channel according to the CFI. The method of claim 7,
Detecting an area occupied by the downlink physical control channel of the terminal through the detected MTC-physical control format indication channel,
And detecting the area occupied by the downlink physical control channel of the terminal based on the different symbol positions of the detected MTC-physical format format channel in the time domain according to the CFI. The method of claim 6,
Detecting the MSO-physical control format indication channel by performing blind decoding on the received subframe,
And performing blind decoding from a specific OFDM symbol among the received subframes to detect a MTC-physical format format indication channel. The method of claim 6,
Detecting the MSO-physical control format indication channel by performing blind decoding on the received subframe,
In the case where the ICT-down physical control channel region and the ICT-down physical shared channel region are divided into time division multiplexing (TDM), blind decoding is performed from the last symbol of the subframe. -Detecting a physical control instruction channel. The method of claim 11,
Detecting an area occupied by the downlink physical control channel of the terminal through the detected MTC-physical control format indication channel,
And the OFDM-physical control format indication channel detects the number of OFDM symbols occupied by the downlink physical control channel of the terminal based on the symbol position detected from the last symbol of the subframe. The method according to claim 5,
Detecting the area occupied by the downlink physical control channel of the terminal in the received subframe,
Extracting CFI information of the terminal by demodulating and decoding a MTC-physical control format indication channel allocated to a predetermined position among the subframes; And
Detecting an area occupied by the downlink physical control channel of the terminal based on the extracted CFI information. A frame configuration unit for allocating physical channels of the MTC terminal to a downlink physical shared channel region between the BS and the MS for transmitting data to the MTC terminal; And
And a communication unit configured to transmit a subframe to which physical channels of the MTC terminal are allocated. The method according to claim 14,
The frame component,
A cyclic shift is performed based on a predetermined MOT-physical control format indication channel code based on a control format indicator (CFI) for the terminal, and the cyclic shifted MOT-physical control format indication channel code The method of claim 2, wherein the MTC-physical control format indication channel is allocated. The method according to claim 14,
The frame component,
And jointly coding the CFI information of the terminal and the CFI information of the MTC terminal and assigning the CFI information to the control channel of the MTC terminal in advance of the subframes. A transceiver for receiving a subframe from a base station; And
And a control unit for detecting a region occupied by the downlink physical control channel of the terminal in the received subframe. 18. The method of claim 17,
The control unit,
Blind decoding is performed on the received subframe to detect a MTC-physical control format indication channel, and the downlink physical control channel of the UE is occupied by the detected MOT-physical control format indication channel. The thing communication terminal characterized in that it detects an area to be. 19. The method of claim 18,
The control unit,
And performing a blind decoding on a cyclic shift (Cyclic shift) for a control format indicator (CFI) for the terminal included in the received subframe to detect the MTC-physical control format indication channel. Communication terminal. 19. The method of claim 18,
The control unit,
In the case where the ICT-down physical control channel region and the ICT-down physical shared channel region are divided into time division multiplexing (TDM), blind decoding is performed from the last symbol of the subframe. Detecting a physical control format indication channel. 18. The method of claim 17,
The control unit,
A region occupied by the downlink physical control channel of the terminal based on the extracted CFI information by demodulating and decoding the MTC-physical control format indication channel allocated to a predetermined position among the subframes. MTS terminal comprising the step of detecting.

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