WO2017160020A1 - Method and apparatus for frame structure configuration and information transmission for short tti - Google Patents

Abstract

The present embodiments relate to a method for configuring a short-TTI frame structure in a 3GPP LTE/LTE-advanced system and a method for transmitting, to a terminal, information on the configured short-TTI frame structure. The present embodiments provide a method for receiving short-TTI frame structure configuration information by a terminal, the method comprising the steps of: receiving, by the terminal, configuration information of a short-TTI configured to have a predetermined number of symbols; and receiving data through a frame structure including the short-TTI configured to have the predetermined number of symbols on the basis of the configuration information of the short-TTI.

Description

Frame structure setting and information transmission method for SHORT TTI and device therefor

The present embodiments relate to a method for configuring a structure and transmitting configuration information of a short TTI frame in a 3GPP LTE / LTE-Advanced system.

Research and discussion for latency reduction in 3GPP LTE / LTE-Advanced systems are underway. The main purpose of latency reduction is to standardize shorter TTI (hereinafter referred to as 'short TTI' or 'sTTI') operation to improve TCP throughput.

To this end, RAN2 performs performance verification on short TTI, and discussions on the feasibility and performance of TTI length between 0.5ms and one OFDM symbol, and maintaining backward compatibility are ongoing.

While research on the physical layer for such a short TTI is ongoing, a specific frame structure for a short TTI has not been determined, and a specific short TTI operation method is also absent.

An object of the present embodiments is to provide a method for a base station to set a short TTI-based frame structure and a specific method for delivering information on the frame structure of the set short TTI to the terminal.

In one aspect, the present embodiment, in the method for the terminal to receive the Short TTI frame structure configuration information, the terminal receiving the configuration information of the Short TTI is set to any number of symbols, the configuration information of the Short TTI And receiving data through a frame structure including a Short TTI set to a number of symbols based on the number of symbols.

In another aspect, the present embodiment, in the method for the base station to transmit the Short TTI frame structure configuration information, the base station to set the number of arbitrary symbols to the Short TTI, and transmits the configuration information of the set Short TTI to the terminal And transmitting data through a frame structure including a Short TTI set to the number of arbitrary symbols.

In another aspect, the present embodiment, in the terminal receiving the Short TTI frame structure configuration information, a receiver for receiving the configuration information of the Short TTI set to the number of arbitrary symbols, and the receiver is based on the configuration information of the Short TTI To provide a terminal including a control unit for controlling to receive data through a frame structure including a short TTI set to the number of arbitrary symbols.

In another aspect, the present embodiment, in the base station for transmitting the Short TTI frame structure configuration information, includes a control unit for setting the number of arbitrary symbols as a Short TTI, and a transmission unit for transmitting the configuration information of the set Short TTI to the terminal The controller provides a base station for controlling the transmitter to transmit data through a frame structure including a Short TTI set to a number of symbols.

According to the present embodiments, there is provided a method for establishing a short TTI based frame structure and a specific method for transmitting information on a set short TTI based frame structure. The principle can be applied to the channel as it is.

1 is a diagram for explaining eNB and UE processing delays and HARQ RTT.

2 is a diagram for describing resource mapping per PRB in one subframe.

FIG. 3 is a diagram for explaining an example (from 1st symbol) of sTTI based frame setting according to <Method 1-1>.

FIG. 4 is a diagram for explaining an example of setting an sTTI-based frame (from Predefined N symbols to ex) 2nd symbols according to <Measure 1-2>.

5 is a conceptual diagram illustrating sTTI scheduling according to <Method 1-3>.

FIG. 6 is a diagram for describing a method of delivering sTTI configuration information according to <Method 2>.

FIG. 7 is a diagram for describing a method of delivering sTTI configuration information according to <Method 3>. FIG.

8 is a flowchart illustrating a method of receiving sTTI configuration information of a terminal according to the present embodiments.

9 is a flowchart illustrating a method of transmitting sTTI configuration information by a base station according to the present embodiments.

10 is a diagram illustrating a configuration of a terminal according to the present embodiments.

11 is a diagram illustrating a configuration of a base station according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

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

In other words, in the present specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations. Alternatively, in the present specification, the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower power consumption). low complexity) can mean 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. The wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB). In the present specification, a user terminal is a generic concept meaning a terminal in wireless communication. In addition, user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a 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, an Sector, a Site, and a BTS. Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be referred to.

In other words, in the present specification, a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station. The eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, and the like, according to the configuration of the radio region, become an embodiment of the base station. In ii), the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.

Therefore, megacells, macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmission / reception points, transmission points, and reception points are collectively referred to as base stations. do.

In the present specification, the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to. The user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

There is no limitation on the multiple access scheme applied to the wireless communication system. Various multiple access techniques 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-TDMA, OFDM-CDMA Can be used. One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

In addition, in a system such as LTE and LTE-advanced, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers. The uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like. Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

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

In the present specification, a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

A wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal. antenna transmission system), a cooperative multi-cell communication system. The CoMP system may include at least two multiple transmission / reception points and terminals.

The multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.

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

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.'

In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.

That is, the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.

In addition, for convenience of description, the EPDCCH, which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the PDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The eNB performs downlink transmission to the terminals. The eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH. For example, a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

Latency reduction in RAN1

Latency reduction Study Items were approved at the RAN plenary # 69 meeting. The main purpose of latency reduction is to standardize shorter TTI operations to improve TCP throughput. To this end, RAN2 has already performed performance verification on short TTI.

Conduct potential impacts and studies related to RAN1 in the following ranges:

O Assess specification impact and study feasibility and performance of TTI lengths between 0.5ms and one OFDM symbol, taking into account impact on reference signals and physical layer control signaling

O backwards compatibility shall be preserved (thus allowing normal operation of pre-Rel 13 UEs on the same carrier);

Latency reduction can be achieved by the following physical layer techniques:

short TTI

reduced processing time in implementation

new frame structure of TDD

Additional agreements reached at the 3GPP RAN WG1 # 84 conference are as follows:

Agreements:

● Following design assumptions are considered:

O No shortened TTI spans over subframe boundary

O At least for SIBs and paging, PDCCH and legacy PDSCH are used for scheduling

● the potential specific impacts for the followings are studied

O UE is expected to receive a sPDSCH at least for downlink unicast

■ sPDSCH refers PDSCH carrying data in a short TTI

O UE is expected to receive PDSCH for downlink unicast

■ FFS whether a UE is expected to receive both sPDSCH and PDSCH for downlink unicast simultaneously

O FFS: The number of supported short TTIs

O If the number of supported short TTIs is more than one,

Agreements:

● Following design assumptions are used for the study

O From eNB perspective, existing non-sTTI and sTTI can be FDMed in the same subframe in the same carrier

FFS: Other multiplexing method (s) with existing non-sTTI for UE supporting latency reduction features

Agreements:

In this study, following aspects are assumed in RAN1.

O PSS / SSS, PBCH, PCFICH and PRACH, Random access, SIB and Paging procedures are not modified.

● Following aspects are further studied in the next RAN1 meeting

O Note: But the study is not limited to them.

O Design of sPUSCH DM-RS

Alt.1: DM-RS symbol shared by multiple short-TTIs within the same subframe

Alt.2: DM-RS contained in each sPUSCH

O HARQ for sPUSCH

Whether / how to realize asynchronous and / or synchronous HARQ

O sTTI operation for Pcell and / or SCells by (e) CA in addition to non- (e) CA case

Basically, in Average down-link latency calculation, the following procedure calculates latency.

1 is a diagram for explaining eNB and UE processing delays and HARQ RTT.

Following the same approach as in section B.2.1 in 3GPP TR 36.912, the LTE U-plane one-way latency for a scheduled UE consists of the fixed node processing delays and 1 TTI duration for transmission, as shown in Figure 1.Assuming the processing times can be scaled by the same factor of TTI reduction keeping the same number of HARQ processes, the one way latency can be calculated as

D = 1.5 TTI (eNB processing and scheduling) + 1 TTI (transmission) + 1.5 TTI (UE processing) + n * 8 TTI (HARQ retransmissions) = (4 + n * 8) TTI.

Considering a typical case where there would be 0 or 1 retransmission, and assuming error probability of the first transmission to be p, the delay is given by

D = (4 + p * 8) TTI.

So, for 0% BLER, D = 4 * TTI,

And for 10% BLER, D = 4.8 * TTI.

Average UE initiated UL transmission latency calculation

Assume UE is in connected / synchronized mode and wants to do UL transmission, e.g., to send TCP ACK. Following table 1 (UL transmission latency calculation) shows the steps and their corresponding contribution to the UL transmission latency. To be consistent in comparison of DL and UL, we add the eNB processing delay in the UL after the UL data is received by the eNB (step 7).

Step Description Delay One. Average delay to next SR opportunity SR periodicity / 2 2. UE sends SR 1 TTI 3. eNB decodes SR and generates scheduling grant 3 TTI 4. Transmission of scheduling grant (assumed always error free) 1 TTI 5. UE processing delay (decoding Scheduling grant + L1 encoding of data) 3 TTI 6. UE sends UL transmission (1 + p * 8) TTI where p is initial BLER. 7. eNB receives and decodes the UL data 1.5 TTI

In the table 1 above, steps 1-4 and half delay of step 5 is assumed to be due to SR, and rest is assumed for UL data transmission in values shown in Table 4

Resource mapping of short TTI [3]

2 is a diagram for describing resource mapping per PRB in one subframe.

In Figure 2 the resource map above is the legacy resource mapping per PRB in one subframe, considering 2 Antenna ports and 2 OFDM symbols control field. In Figure 2 the resource map below is the short TTI resource mapping, considering 2 OFDM symbols used for the control field in order to ensure the backward compatibility. The loss rates (L _legacy , eg 5%-50%) of the PHY layer in short TTI duration are assumed.

TBS Calculation of short TTI

According to the resource mapping and the TBS calculation formula given above, the loss rate of PHY layer for legacy PDSCH is calculated as follows:

For different short TTI duration, The TBS of short TTI PDSCH is calculated as the following table 2 (TBS calculation for different TTI duration):

As described above, the research on the physical layer for the short TTI is ongoing, the frame structure for the specific short TTI has not been determined, and the specific short TTI operation method is also absent.

The present invention proposes a method for setting a short TTI based frame structure and a method for transmitting information to a terminal about frame structure setting.

Unlike the existing LTE / LTE-Advanced frame structure (TTI = 1ms = 14 OFDM symbols), a short TTI may be composed of a set of 1, 2, 3, 4, and 7 symbols. In this case, a method of configuring a short TTI frame structure in consideration of the existing PDCCH, PDSCH, etc. will be described.

Scheme 1. A fixed format is set regardless of the area of the PDCCH.

Basically, legacy PDCCH is allocated up to 3 symbols in the entire DL band. To this end, the UE can detect the PCFICH first to know the symbol interval to which the PDCCH is allocated.

Therefore, it can be seen that the symbol interval of the PDCCH is always flexible and cannot be fixed to a specific value.

Since the Short TTI is a frame structure additionally used in addition to the existing TTI frame structure, it is always appropriate to be set in consideration of the fluid symbol interval of the PDCCH. However, since such a short TTI configuration requires frequent frame changes, an indication of frequent signaling and corresponding terminal operation is required.

Therefore, this proposal proposes a method of using a fixed format regardless of the existing PDCCH interval in setting a short TTI set in an overlay form on an existing frame structure.

Option 1-1. Short TTI  Extremely 1st OFDM From symbol  Can be set.

FIG. 3 is a diagram for explaining an example (from 1st symbol) of sTTI based frame setting of <Method 1-1>.

In this proposal, the configuration does not consider the legacy PDCCH region in setting the sTTI-based frame structure.

That is, the sTTI-based frame structure is set according to a predefined pattern regardless of the setting of the PDCCH. In this case, although it may overlap with the existing PDCCH region, the frame structure setting is not changed.

Option 1-2. Short TTI  Minimal legacy PDCCH  'N' Symbol  It can be set from the excluded area.

FIG. 4 is a diagram for explaining an example of sTTI-based frame setting (from Predefined N symbol, ex) from 2nd symbol of <Method 1-2>.

In the proposal, the sTTI configuration pattern is determined in consideration of the N symbol, which is the minimum legacy PDCCH region, in setting the sTTI-based frame structure. In this case, the following case may occur.

1) When the actual legacy PDCCH region is smaller than the set N symbol

2) When the actual legacy PDCCH region is the same as the N symbol set

3) When the actual legacy PDCCH region is larger than the set N symbol

This proposal sets and uses sTTI-based frame pattern based on the predefined symbol N regardless of all these setting situations.

Option 1-3. Fixed short TTI  Format and PDCCH  If regions overlap, short TTI of the region is not scheduled.

5 is a conceptual diagram illustrating sTTI scheduling according to <Method 1-3>.

As in <Method 1-1, Method 1-2> mentioned above, it is assumed that the start point of the sTTI-based frame structure is basically set regardless of the legacy PDCCH region, and the corresponding sTTI frame is set.

At this time, collision may occur in the sTTI region and the legacy legacy PDCCH region as shown in FIG. 5. In this case, this problem is solved by omitting sTTI scheduling of the corresponding area.

That is, since legacy PDCCH basically performs dynamic scheduling, its region may be changed in subframe units. Figure 3 shows that the legacy PDCCH region is changed from '3 symbol interval' to '2 symbol interval' between successive subframes.

According to this proposal, two sTTIs overlapping with the corresponding region are excluded from the scheduling in subframe x and one sTTI in subframe x + 1.

Solution 2. Short Of TTI  Setting information (start position, frame structure pattern, etc.) Of PDCCH  dynamic through common control space Signaling  In a way.

FIG. 6 is a diagram for describing a method of delivering sTTI configuration information according to <Method 2>.

The present proposal includes a method for delivering the aforementioned sTTI frame configuration information to UEs, and includes a case for transmitting sTTI configuration information through common signaling.

That is, in delivering the entire configuration information of the sTTI rather than the specific individual resource allocation and control information for each UE, each UE can use itself by detecting the common search space (CSS) of the legacy PDCCH located in front of each subframe. An sTTI frame structure can be obtained. In this case, it is impossible to transfer sTTI frequency resource region information that can be read by each UE individually.

The sTTI configuration information may include the following.

1) sTTI configuration pattern: sTTIs may be composed of 1/2/3/4/7 symbols, and may convey specific information or pattern information on how the sTTI combination is configured in a subframe.

Ex) Pattern 1: 2 symbols / 3 symbols / 2 symbols / 2 symbols / 3 symbols / 2 symbols (total 14 symbols)

    Pattern 2: 3 symbols / 4 symbols / 3 symbols / 4 symbols (total 14 symbols)

2) sTTI Frequency Domain Allocation Pattern: It is assumed that the sTTI subframe is partially configured rather than set over the entire system BW. Therefore, specific RBsets can be set continuously or at equal intervals or concentrated in a specific area.

Solution 3. Short Of TTI  Setup information is RRC With signaling  Pass, short TTI  Service triggering through a frame is set by dynamic signaling.

FIG. 7 is a diagram for describing a method of delivering sTTI configuration information according to <Method 3>. FIG.

The present proposal includes a method for delivering the aforementioned sTTI frame configuration information to UEs, and includes a case of UE-specific signaling of configuration information for sTTI.

That is, in delivering the entire configuration information of the sTTI rather than the specific control information, the sTTI configuration information is transmitted to the individual terminals through RRC signaling to each terminal.

The sTTI configuration information may include the following.

1) sTTI configuration pattern: sTTIs may be composed of 1/2/3/4/7 symbols, and may convey specific information or pattern information on how the sTTI combination is configured in a subframe.

Ex) Pattern 1: 2 symbols / 3 symbols / 2 symbols / 2 symbols / 3 symbols / 2 symbols (total 14 symbols)

    Pattern 2: 3 symbols / 4 symbols / 3 symbols / 4 symbols (total 14 symbols)

2) sTTI Frequency Domain Allocation Pattern: It is assumed that the sTTI subframe is partially configured rather than set over the entire system BW. Therefore, specific RBsets can be set continuously or at equal intervals or concentrated in a specific area.

3) allocation information for each UE for sTTI frequency domain resources

Each UE may acquire sTTI frame structure information that may be used by detecting UE specific search space (UESS) of legacy PDCCH located in front of the subframe.

In FIG. 7, signaling through UESS for a case where an sTTI structure is set in common in each subframe is illustrated. In this case, all UE-specific information delivered to inter-terminals may be the same, and as shown in FIG. 7, additionally, an sTTI frequency resource region that can be read by each UE may also be referred to.

Control information transmission of the actual sTTI frame may be performed through the sPDCCH.

8 illustrates a method of receiving sTTI frame structure configuration information by a terminal according to the present embodiments.

Referring to FIG. 8, the terminal according to the present exemplary embodiments receives configuration information of a short TTI set to the number of arbitrary symbols from the base station (S800).

The terminal may receive configuration information of the short TTI set in a fixed format regardless of the existing PDCCH interval from the base station.

As an example, the short TTI may be set from a 1st OFDM symbol. Alternatively, the short TTI may be set from an area except the minimum legacy PDCCH 'N' symbol.

At this time, if the fixed short TTI format and the PDCCH region overlap, the short TTI of the corresponding region does not perform scheduling. That is, by setting the short TTI irrespective of the existing PDCCH interval, collision may occur in the short TTI region and the legacy PDCCH region. In this embodiment, the collision is omitted by omitting sTTI scheduling.

The UE may receive configuration information of the short TTI through a dynamic signaling method through a common control region of the PDCCH. The setting information of the short TTI may include information such as a short TTI configuration pattern and a short TTI frequency domain allocation pattern.

Alternatively, the terminal may receive configuration information of the short TTI by RRC signaling, and service triggering through the short TTI frame may be configured by dynamic signaling. The configuration information of the short TTI may include a short TTI configuration pattern, a short TTI frequency domain allocation pattern, and allocation information for each terminal for the short TTI frequency domain resource.

In addition, the terminal may receive configuration information of the short TTI through higher layer signaling.

The terminal receives data through a frame structure including a short TTI set to the number of arbitrary symbols based on the configuration information of the short TTI received from the base station (S810).

Here, the number of arbitrary symbols for which the short TTI is set may be two or seven.

In addition, a specific subframe of the short TTI frame structure may have a configuration pattern in which the number of arbitrary symbols of the short TTI is combined.

The terminal may transmit data through a frame structure including a short TTI set to the number of arbitrary symbols. In this case, the number of arbitrary symbols may be two, four, or seven.

9 illustrates a method for transmitting sTTI frame structure configuration information by a terminal according to the present embodiments.

Referring to FIG. 9, the base station according to the present embodiments sets the short TTI to the number of arbitrary symbols (S900).

The base station may set the short TTI in a fixed format regardless of the existing PDCCH interval.

As an example, the base station may set the short TTI starting from the 1st OFDM symbol. Alternatively, the short TTI may be set from an area excluding a minimum legacy PDCCH 'N' symbol.

In this case, since the short TTI is set regardless of the existing PDCCH interval, collision may occur in the short TTI region and the legacy PDCCH region. If the fixed short TTI format and the PDCCH region overlap, the short TTI of the corresponding region will not be scheduled. Can be.

The base station transmits the configuration information of the short TTI to the terminal (S910).

The base station may transmit configuration information of the short TTI through a dynamic signaling scheme through a common control region of the PDCCH. The setting information of the short TTI may include information such as a configuration pattern of the short TTI and a short TTI frequency domain allocation pattern.

Alternatively, the base station may transmit configuration information of the short TTI by RRC signaling, and service triggering through the short TTI frame may be configured by a dynamic signaling method. The configuration information of the short TTI may include a short TTI configuration pattern, a short TTI frequency domain allocation pattern, and allocation information for each terminal for the short TTI frequency domain resource.

In addition, the base station may transmit configuration information of the short TTI through higher layer signaling.

The base station transmits data through the frame structure including the short TTI set to the number of arbitrary symbols based on the setting information of the short TTI (S920).

Here, the number of arbitrary symbols for which the short TTI is set may be two or seven.

In addition, a specific subframe of the short TTI frame structure may have a configuration pattern in which the number of arbitrary symbols of the short TTI is combined.

The base station may receive data through a frame structure including a short TTI set to the number of arbitrary symbols. In this case, the number of arbitrary symbols may be two, four, or seven.

10 illustrates a configuration of a terminal 1000 that receives sTTI frame structure configuration information according to the present embodiments.

Referring to FIG. 10, the terminal 1000 according to the present exemplary embodiments includes a receiver 1010, a controller 1020, and a transmitter 1030.

The receiver 1010 receives downlink control information, data, and a message from a base station through a corresponding channel.

The controller 1020 controls the overall process of the terminal 1000 according to the sTTI-based frame structure setting and the frame structure setting information necessary for carrying out the above-described present invention.

The transmitter 1030 transmits uplink control information, data, and a message to a base station through a corresponding channel.

11 illustrates a configuration of a base station 1100 transmitting sTTI frame structure configuration information according to the present embodiments.

Referring to FIG. 11, the base station 1100 according to the present embodiments includes a controller 1110, a transmitter 1120, and a receiver 1130.

The controller 1110 controls the overall process of the base station 1100 by transmitting information on the sTTI-based frame structure setting and the frame structure setting necessary for carrying out the above-described present invention to the terminal.

The transmitter 1120 and the receiver 1130 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.

The present invention has described a method for establishing an sTTI-based frame structure and a specific delivery method for delivering configuration information. The method can be applied to a similar signal and channel as it is, and its application is limited only to a new frame structure. It doesn't work.

The standard contents or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification and form a part of the present specification. Therefore, the addition of the contents of the standard and part of the standard documents to the specification or the description in the claims should be construed as falling within the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with the Korean Patent Application No. 10-2016-0030172 filed in Korea on March 14, 2016 and the patent application No. 10-2017-0022956 filed in Korea on February 21, 2017. Priority is claimed under section (a) (35 USC § 119 (a)), all of which is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (20)

In the method for the terminal to receive the Short TTI frame structure configuration information, Receiving, by the terminal, configuration information of a Short TTI set to a number of symbols; And And receiving data through a frame structure including the short TTI set to the number of arbitrary symbols based on the setting information of the short TTI. The method of claim 1, And the number of the arbitrary symbols for which the Short TTI is set is two or seven. The method of claim 2, And a specific subframe having a frame structure including the short TTI has a configuration pattern in which the number of the arbitrary symbols for which the short TTI is set is combined. The method of claim 1, Transmitting data through a frame structure including the short TTI set to the number of symbols; The number of the arbitrary symbols for which the Short TTI is set, characterized in that two or seven. The method of claim 1, The configuration information of the Short TTI is received through higher layer signaling. In the method for the base station to transmit the Short TTI frame structure configuration information, Setting, by the base station, the number of arbitrary symbols to a Short TTI; Transmitting setting information of the set Short TTI to a terminal; And Transmitting data over a frame structure comprising the Short TTI set to the number of symbols. The method of claim 6, And the number of the arbitrary symbols for which the Short TTI is set is two or seven. The method of claim 7, wherein And a specific subframe having a frame structure including the short TTI has a configuration pattern in which the number of the arbitrary symbols for which the short TTI is set is combined. The method of claim 6, Receiving data through a frame structure including the short TTI set to the number of arbitrary symbols, The number of the arbitrary symbols for which the Short TTI is set, characterized in that two or seven. The method of claim 6, The configuration information of the Short TTI is transmitted through higher layer signaling. In a terminal receiving Short TTI frame structure configuration information, A receiving unit for receiving setting information of a Short TTI set to a number of arbitrary symbols; And And a control unit configured to control the reception unit to receive data through a frame structure including the short TTI set to the number of arbitrary symbols based on the setting information of the short TTI. The method of claim 11, The terminal characterized in that the number of the arbitrary symbols for which the Short TTI is set to two or seven. The method of claim 12, And a specific subframe having a frame structure including the short TTI has a configuration pattern in which the number of the arbitrary symbols for which the short TTI is set is combined. The method of claim 11, The apparatus may further include a transmitter configured to transmit data through a frame structure including the short TTI set to the arbitrary number. The terminal, characterized in that the number of the arbitrary symbols for which the Short TTI is set to two or seven. The method of claim 11, The configuration information of the Short TTI is received through higher layer signaling. In the base station for transmitting the Short TTI frame structure configuration information, A controller configured to set the number of arbitrary symbols to a Short TTI; And A transmitter which transmits the set configuration information of the short TTI to a terminal, The control unit, And a transmitter to control data to be transmitted through a frame structure including the short TTI set to the number of symbols. The method of claim 16, The base station, characterized in that the number of the arbitrary symbols for which the Short TTI is set to two or seven. The method of claim 17, And a specific subframe having a frame structure including the short TTI has a configuration pattern in which the number of the arbitrary symbols for which the short TTI is set is combined. The method of claim 16, And a receiver configured to receive data through a frame structure including the short TTI set to the number of arbitrary symbols. The base station, characterized in that the number of the arbitrary symbols for which the Short TTI is set to two or seven. The method of claim 16, The base station, characterized in that for transmitting the configuration information of the Short TTI through higher layer signaling.

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