KR20160037797A - Method and apparatus for transmitting and receiving physical channel and signal - Google Patents

Method and apparatus for transmitting and receiving physical channel and signal Download PDF

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Publication number
KR20160037797A
KR20160037797A KR1020150136378A KR20150136378A KR20160037797A KR 20160037797 A KR20160037797 A KR 20160037797A KR 1020150136378 A KR1020150136378 A KR 1020150136378A KR 20150136378 A KR20150136378 A KR 20150136378A KR 20160037797 A KR20160037797 A KR 20160037797A
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South Korea
Prior art keywords
slot
base station
control channel
downlink
resource block
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KR1020150136378A
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Korean (ko)
Inventor
노태균
고영조
방승찬
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한국전자통신연구원
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Priority to US14/868,014 priority Critical patent/US20160094315A1/en
Publication of KR20160037797A publication Critical patent/KR20160037797A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Receiving information on a format of a control channel from a base station through an upper layer signaling and allocating a plurality of resource blocks located at both ends of the system band to a base station through one slot based on information on the format of the control channel There is provided a control channel transmission method and a method of performing a shortened HARQ process including transmitting a control channel mapped to at least one resource block.

Figure P1020150136378

Description

TECHNICAL FIELD The present invention relates to a physical channel and a method for transmitting and receiving a physical channel,

The present invention relates to a method and apparatus for transmitting and receiving physical channels and signals in a wireless communication system.

In a long term evolution (LTE) wireless communication system, a transmission time interval (TTI) of a physical channel is a subframe. At this time, one subframe is composed of two slots, and one slot may be composed of a plurality of symbols. The subframe, slot and slot are all units of radio resources defined in the time domain. At this time, it is possible to reduce the delay of data transmission / reception by overriding the length of the TTI.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for transmitting and receiving a physical channel and a signal between a terminal and a base station of a wireless communication system based on a redefined TTI.

According to an embodiment of the present invention, a control channel transmission method of a terminal is provided. The control channel transmission method includes receiving information on a format of a control channel from a base station through an upper layer signaling and transmitting a control channel to a base station through one slot based on information on the format of the control channel And the control channel is a control channel mapped to at least one resource block among a plurality of resource blocks located at both ends of the system band.

In the control channel transmission method, the control channel may be a first resource block located at one end of the system band and a control channel mapped to a second resource block located at the opposite end of the system band, have.

In the control channel transmission method, a resource block may be a resource block disposed at the same position at both ends of a system band in units of N consecutive resource blocks.

If N is 2 in the control channel transmission method, the resource block may be a resource block whose relative position between two resource blocks is determined according to whether two consecutive indexed resource blocks are even or odd.

In the control channel transmission method, a resource block is a resource block in which a relative position to an N resource blocks of an i-th resource block is determined based on an index of an i-th resource block among N consecutive resource blocks, Block.

In the control channel transmission method, when the reception performance of the control channel is poor, the control channel is transmitted to the base station through one slot and the next slot of one slot based on the information on the format of the control channel Step < / RTI >

The receiving in the control channel transmission method may include receiving information on the format of the control channel from the base station through RRC signaling or system information.

According to another embodiment of the present invention, a method is provided for a terminal to perform an HARQ process. The HARQ process method includes receiving a signal from a base station in a first slot of a plurality of slots included in a frame, and when the terminal operates in a frequency division duplex (FDD) system, Performing a HARQ process of an FDD system for a signal on a per-slot basis, and when the terminal is operating in a time division duplex (TDD) system, Of the HARQ process.

Performing HARQ processes of the FDD system in the method of performing HARQ processes comprises: if the signal is a first physical downlink shared channel, performing an uplink ACK or NACK from a second slot, which is one slot away from the first slot, And receiving a second physical downlink shared channel corresponding to a first physical downlink shared channel in a third slot that is one slot apart from the second slot when the uplink NACK is transmitted to the base station, .

The step of performing the HARQ process of the FDD system in the method of performing HARQ process includes: when a first signal is downlink ACK or NACK or uplink scheduling information, the step of performing an HARQ process from the second slot, which is one slot away from the first slot, Transmitting a physical uplink shared channel, and receiving downlink ACK or NACK or uplink scheduling information from a base station in a third slot, which is one slot apart from the second slot.

In the HARQ process, the step of performing HARQ process of the TDD system includes the steps of: if the first slot is a downlink slot or a special slot and the signal is a first physical downlink shared channel, Transmitting an uplink ACK or NACK from the second slot to the base station, and transmitting uplink ACK or NACK from the second slot to the base station when the uplink NACK is transmitted to the base station, And receiving a second physical downlink shared channel.

In the HARQ process, if the first slot is a downlink slot, the third slot is a downlink slot, and if the first slot is a special slot, the third slot may be a special slot.

In the HARQ process, the step of performing the HARQ process of the TDD system comprises the steps of: when the first slot is a special slot and the signal is downlink ACK or NACK or uplink scheduling information, at least one slot from the first slot Transmitting a physical uplink shared channel from the second slot to the base station, and receiving downlink ACK or NACK or uplink scheduling information in a special slot located next to the second slot.

In the HARQ process, the step of performing HARQ process of the TDD system comprises the steps of: when a first slot is a downlink slot and a signal is a downlink ACK or NACK or uplink scheduling information, Transmitting a physical uplink shared channel from the second slot to the base station, and receiving downlink ACK or NACK or uplink scheduling information in a downlink slot located next to the second slot.

According to the embodiment of the present invention, the control channel is transmitted quickly based on the redefined TTI, so that the data transmission / reception delay can be reduced and the HARQ timing can be improved.

1 is a diagram illustrating a physical uplink control channel of a wireless communication system according to an embodiment of the present invention.
2 to 4 are views illustrating a physical uplink control channel of a wireless communication system according to an embodiment of the present invention.
5 is a diagram illustrating a physical downlink control channel according to an embodiment of the present invention.
6 shows a frame structure of a frequency division duplex communication system according to an embodiment of the present invention.
7 shows a frame structure of a time division duplex communication system according to an embodiment of the present invention.
8 and 9 are views showing a physical broadcast channel and a sync signal included in a single slot TTI frame according to an embodiment of the present invention.
10 is a diagram illustrating downlink HARQ timing and uplink HARQ timing of an FDD system according to an embodiment of the present invention.
11 is a diagram illustrating downlink HARQ timing of a TDD system according to an embodiment of the present invention.
12 is a diagram illustrating uplink HARQ timing of a TDD system according to an embodiment of the present invention.
13 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, a terminal may be referred to as a mobile station (MS), a terminal, a mobile terminal (MT), an advanced mobile station (AMS), a high reliability mobile a subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE), a mechanical communication equipment and may include all or some of the functions of MT, MS, AMS, HR-MS, SS, PSS, AT, UE and the like.

Also, a base station (BS) is an advanced base station (ABS), a high reliability base station (HR-BS), a node B, an evolved node B, eNodeB), an access point (AP), a radio access station (RAS), a base transceiver station (BTS), a mobile multihop relay (MMR) (RS), a relay node (RN) serving as a base station, an advanced relay station (ARS) serving as a base station, a high reliability relay station (HR) A femto BS, a home Node B, a HNB, a pico BS, a macro BS, a micro BS, ), Etc., and may be all or part of an ABS, a Node B, an eNodeB, an AP, a RAS, a BTS, an MMR-BS, an RS, an RN, an ARS, It may include a negative feature.

1 is a diagram illustrating a physical uplink control channel of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, a physical uplink control channel (PUCCH) can be transmitted during one subframe, and each subframe includes two slots in the time domain. Each slot includes a plurality of resource blocks defined in the time and frequency domain, and the PUCCH can be transmitted through one resource block. In FIG. 1, the numbers shown in one resource block represent indexes of respective resource blocks, and resource blocks of the same index are included in different slots.

2 to 4 are views illustrating a physical uplink control channel of a wireless communication system according to an embodiment of the present invention.

First, a BS according to an embodiment of the present invention may serve as a cell controller for controlling one cell. Therefore, parameters assigned differently for each cell can be assigned to different values by each base station. Also, in a real communication system, one physical base station can control a plurality of cells, wherein a physical base station may include a plurality of base stations according to an embodiment of the present invention.

Referring to FIG. 2 to FIG. 4, a PUCCH according to an embodiment of the present invention can be transmitted in two resource blocks during one slot. That is, since a wireless communication system according to an embodiment of the present invention has a single slot TTI frame structure, an uplink control channel such as a PUCCH can also be transmitted through one slot. The resource blocks to which the same PUCCH is mapped are indicated by the same index, and two resource blocks to which one PUCCH is mapped are respectively located at both ends of the system bandwidth in order to obtain the frequency diversity gain. 2 to 4, one PUCCH according to an embodiment of the present invention is mapped to four resource blocks located at both ends of a system band, and a total of four PUCCHs are transmitted through one slot .

Referring to FIG. 2, the resource blocks to which the PUCCH is mapped are arranged inward from the outside of the system band in the index order. The placement order of the resource blocks is the same at both ends. That is, the resource block 0 is arranged at the outermost of the system bandwidth, the resource block 1 is arranged in the first inner side of the system bandwidth, the second resource block is arranged in the inner side, 3 resource blocks are arranged.

Referring to FIG. 3, a resource block to which a PUCCH is mapped is arranged at the same position at both ends of a system bandwidth in units of two resource blocks in which indexes are continuous. And, the relative position between two resource blocks located at one end of the system bandwidth is the same at the opposite end of the system bandwidth. For example, in FIG. 3, the 0-th resource block (even index) is arranged at the lower part of FIG. 3 than the 1-th resource block (odd index), which is applied equally at both ends of the system bandwidth. In addition, in FIG. 3, the third resource block (odd index) is arranged above the third resource block (even index) in FIG. 3, and this applies equally to both ends of the system bandwidth. That is, when the resource block to which the PUCCH is mapped is arranged in units of two resource blocks, the relative position between the two resource blocks can be determined according to whether the index of each resource block is even or odd.

Meanwhile, the resource block to which the PUCCH is transmitted according to an embodiment of the present invention may be disposed at the same position at both ends of the system bandwidth in units of N consecutive resource blocks. And the relative position between the N resource blocks located at one end of the system bandwidth is the same at the opposite end of the system bandwidth. For example, in FIG. 4, the resource blocks 0, 1, 2, and 3 are arranged in the same order in the up and down directions of FIG. 4 at both ends of the system bandwidth. That is, the 0-th resource block is arranged at the bottom of the 4 consecutive resource blocks, 1-th resource block is arranged thereon, 2-th resource block is arranged thereon, And is arranged at the top of four consecutive resource blocks. In this case, the relative position between N contiguous resource blocks can be defined as a modulo operation on the index of the resource block. Referring to FIG. 4, if a modulo operation is performed on the index i of each resource block by the number N of consecutive resource blocks N (N = 4 in FIG. 4) (i mod N) The relative positions of N resource blocks of the resource block index i in one group can be determined. For example, in FIG. 4, a resource block of index 2 is derived as a result of performing a modulo operation of 4, so that a resource block of index 2 can be arranged at the third of four resource blocks.

In this case, if the signal strength of the PUCCH received at the base station is large according to the location of the UE or the channel environment, the PUCCH may be mapped only to one resource block (i.e., one resource block) located at one end of the system bandwidth have. Or, if the terminal is located far from the base station, or if the reception performance of the PUCCH is not good due to the transmission power limit according to the channel environment between the terminal and the base station, the PUCCH can allocate resources blocks located at both ends of the system bandwidth I.e., four resource blocks).

According to an embodiment of the present invention, information on the format of the PUCCH may be transmitted from the base station to the mobile station through upper layer signaling. At this time, the upper layer signaling may be radio resource control (RRC) signaling or system information. At this time, the format of the PUCCH may be different for each UE according to upper layer signaling, and may be different for each cell. And the cells can be distinguished through physical cell identifiers or can be distinguished through virtual cell identifiers.

5 is a diagram illustrating a physical downlink control channel according to an embodiment of the present invention.

Referring to FIG. 5, a physical downlink control channel (PDCCH) according to an embodiment of the present invention may include a plurality of control channel elements (CCEs). Each control channel element is composed of a plurality of resource element groups (REG), and each resource element group includes a plurality of resource elements (REs). At this time, the positions of resource element groups included in one resource block are the same for each resource block.

Referring to FIG. 5, one resource block includes 12 resource element groups along the frequency axis, and 7 resource element groups along the time axis. Each resource element group is indexed numerically, and each resource element group contains nine resource elements.

On the other hand, the aggregation level means the number of CCEs constituting the PDCCH. For example, in an aggregation level 2, one PDCCH consists of two control channel elements. When the aggregation level is increased, the coding rate of the PDCCH is lowered, so that the terminal can successfully demodulate the PDCCH even when the strength of the signal received by the terminal is small. That is, for example, if the signal strength of the PDCCH received by the UE is large, the UE can successfully demodulate the PDCCH with a low aggregation level, and if the signal strength of the PDCCH is small, Can be successfully demodulated. In addition, the UE may perform blind decoding while varying the aggregation level for the PDCCH. At this time, the number of blind demodulations performed by the UE may vary depending on the aggregation level.

(Basic combination) for the aggregation level of PDCCH and the number of blind demodulations for each aggregation level, an aggregation level for terminals with small PDCCH received signal strength, and a blind demodulation number for each aggregation level Combination). The additional combination may have a different level of integration compared to the basic combination and the number of blind demodulations for each level may be the same. Alternatively, the additional combination may be different for both the basic combination and the integration level and the number of blind demodulations for each integration level.

According to an embodiment of the present invention, the base station can inform the terminal through the upper layer signaling that the combination of the PDCCH aggregation level and the blind demodulation number for each aggregation level is a basic combination or an additional combination. At this time, the upper layer signaling may be RRC signaling or system information. The aggregation level of the PDCCH and the number of blind demodulations received by the terminal may differ from terminal to terminal or from cell to cell according to upper layer signaling.

According to one embodiment of the present invention, the aggregation level in the base combination is {1, 2, 4, 8} and the number of blind demodulations for each aggregation level is {6, 6, 2, 2}. And, in the further combination, the integration level is {2, 4, 8, 16}, and the number of demodulations for each integration level is {6, 6, 2, 2}. Through higher layer signaling, the aggregation level can be distinguished as {1, 2, 4, 8} or {2, 4, 8, 16}.

If the terminal is far away from the base station, the terminal may need to format the PUCCH to be transmitted during the two slots. In addition, a terminal far from the base station may require a combination of a high aggregation level and a high blind demodulation count for the PDCCH. Accordingly, the base station can inform the mobile station of the combination of the PUCCH format, the aggregation level of the PDCCH, and the number of blind demodulations through one higher layer signaling. At this time, the upper layer signaling may be RRC signaling or system information.

The PDCCH may include control information for a physical downlink data channel and a physical uplink data channel, and the control information includes information on resource allocation. The information on resource allocation includes information on frequency-domain resources for physical downlink / uplink data channels transmitted in one slot. Since one physical downlink / uplink data channel is transmitted during one slot, two PDCCHs are required to transmit control information for two physical downlink / uplink data channels transmitted in two slots . According to an embodiment of the present invention, in order to reduce the overhead of the PDCCH, one PDCCH may transmit control information for physical downlink / uplink data channels transmitted during two slots. At this time, the number of slots of the physical downlink / uplink data channel transmitted in the two slots may be one or two. If there are two physical downlink / uplink data channel slots transmitted in two slots, two physical downlink / uplink data channels can be scheduled equally according to one PDCCH.

The base station according to an embodiment of the present invention can inform the UE of information on the number of slots of the physical downlink / uplink data channel to which one PDCCH is applied through upper layer signaling. At this time, the upper layer signaling may be RRC signaling or system information. The number of slots of the physical downlink / uplink data channel to which the physical downlink control channel is applied may be different for each mobile station according to an upper layer signaling, and may be different for each cell. At this time, the cells may be distinguished through physical cell identifiers or may be distinguished through virtual cell identifiers.

The base station according to another embodiment of the present invention can notify the MS about the number of slots of the physical downlink / uplink data channel to which one PDCCH is applied through physical layer signaling. At this time, the physical layer signaling may be a bit field defined in the control information of the PDCCH. The bit region defined in the control information of the PDCCH may be a previously defined region or may be a newly defined bit region for informing information on the number of slots of the physical downlink / uplink data channel. Or physical layer signaling may be a cyclic redundancy check (CRC) mask applied to the PDCCH.

FIG. 6 shows a frame structure of a frequency division duplex communication system according to an embodiment of the present invention, and FIG. 7 shows a frame structure of a time division duplex communication system according to an embodiment of the present invention.

Referring to FIG. 6, a frequency division duplexing (FDD) system has a single slot TTI frame structure. That is, one frame in the FDD system according to an embodiment of the present invention includes 10 slots.

Referring to FIG. 7, a frame of a time division duplexing (TDD) system according to an embodiment of the present invention also has a single slot TTI frame structure. In the frame of the TDD system, the 0th slot (slot # 0) and the 5th slot (slot # 5) are downlink slots. The first slot (slot # 1) and the sixth slot (slot # 6) are special slots and include a downlink pilot time slot (DwPTS), a guard period (GP) And an uplink pilot time slot (UpPTS). The remaining slots (slot # 2, slot # 3, slot # 4, slot # 7, slot # 8, slot # 9) included in the frame of the TDD system may be a downlink slot or an uplink slot.

8 and 9 are views showing a physical broadcast channel and a sync signal included in a single slot TTI frame according to an embodiment of the present invention.

In a single slot TTI, a physical broadcast channel (PBCH) and a synchronization signal (SS) may be arranged differently from the conventional system. The synchronization signal may be composed of a primary synchronization signal (primary SS, PSS) and a secondary synchronization signal (secondary SS, SSS). The synchronization signal may be transmitted through 62 subcarriers in the frequency domain and may be transmitted through one orthogonal frequency division multiplexing (OFDM) symbol in the time domain.

Referring to Figs. 8 and 9, the PBCH can be equally placed in FDD and TDD. Since the PBCH is a downlink channel, in the TDD, the PBCH can be transmitted in the 0th slot, 1th slot, 5th slot and 6th slot in which downlink transmission is guaranteed. At this time, since the PBCH can be transmitted less than once in one frame, the PBCH can be transmitted in the 0th slot or 1th slot in consideration of the PBCH period. Also, since the slot # 1 is a special slot and the length of the DwPTS is variable, the PBCH can be transmitted in the slot # 0 in an embodiment of the present invention.

Referring to FIG. 8, the PBCH may be transmitted only in an even-numbered frame and not transmitted in an odd-numbered frame according to a period of a PBCH. Referring to FIG. 9, the PBCH can be transmitted in slot 0 of all frames.

Referring to FIG. 8 and FIG. 9, the PBCH can be transmitted through six resource blocks around a carrier frequency in the frequency domain. Also, the PBCH can be transmitted from OFDM symbol # 0 to # 4 OFDM symbol in the time domain.

The synchronization signal may be transmitted at different locations in the frame of the FDD system and the frame of the TDD system, respectively. Since the synchronization signal is also a downlink channel, the synchronization signal in the TDD system can be transmitted in the 0th slot, 1th slot, 5th slot or 6th slot in which downlink transmission is ensured. In this case, considering the period of the synchronization signal, the PSS and the SSS can be transmitted in less than one time in one frame, and thus can be transmitted in the 0th slot or 1th slot. Likewise, since the slot 1 is a special slot and the length of the DwPTS is variable, the sync signal can be transmitted in the symbol at the beginning of slot 1. [ Referring to FIG. 8, the SSS of the TDD system is transmitted in the symbol # 0 of slot # 1 of each frame, and the PSS of the TDD system is transmitted in symbol # 3. That is, there are two OFDM symbols between the SSS and the PSS. Referring to FIG. 9, the SSS of the TDD system is transmitted in the symbol # 0 of the slot # 1 and slot # 6 of each frame, and the PSS of the TDD system is transmitted in the symbol # 3. FIG. 9 shows a frame structure of a case where the periods of the physical broadcast channel and the synchronization signal are short. Referring to FIG. 9, the PBCH is transmitted once every frame, and the synchronization signal is transmitted twice every frame.

In the FDD system, the synchronization signal can be transmitted in symbols # 5 and # 6 of slot # 0. Referring to FIG. 8, the SSS of the FDD system is transmitted in the fifth symbol of the 0th slot of the even-numbered frame of the FDD system, and the PSS is transmitted in the sixth symbol. At this time, the PBCH can be transmitted from the 0th symbol to the 4th symbol (5 symbols) of the 0th slot. Referring to FIG. 9, a synchronization signal of the FDD system can be transmitted in slots 0 and 5 of a frame of the FDD system. That is, the SSS and the PSS are transmitted through the 5th symbol and the 6th symbol of the 0th slot of each frame of the FDD system, respectively, and the SSS and the PSS are transmitted through the 5th symbol and the 6th symbol of the 5th slot, respectively have.

In the FDD system and the TDD system, the SSS transmitted in the even-numbered frame and the odd-numbered frame may be different from each other. Referring to FIG. 8, an SSS transmitted in an even-numbered frame in which a PBCH is transmitted is different from an SSS transmitted in an odd-numbered frame in which a PBCH is not transmitted.

10 is a diagram illustrating downlink HARQ timing and uplink HARQ timing of an FDD system according to an embodiment of the present invention.

The timing of the hybrid automatic repeat request (HARQ) in a single slot TTI differs from that of the existing system. The downlink HARQ timing is as follows. The UE receives a physical downlink shared channel (PDSCH) from a base station and transmits uplink ACK / NACK (A / N) to the Node B after one slot. The base station receiving the uplink A / N from the UE transmits the PDSCH after one slot. At this time, when the BS receives the uplink NACK from the UE, the BS can retransmit the PDSCH corresponding to the previously transmitted PDSCH. That is, when the uplink NACK is received at the base station, the PDSCH for correcting the error of the previously transmitted PDSCH can be transmitted from the base station to the mobile station. In the FDD system according to an embodiment of the present invention, the round trip time (RTT) of the downlink HARQ corresponds to four slots and the number of the downlink HARQ processes is four.

The uplink HARQ timing is as follows. The UE receives downlink A / N and / or uplink scheduling information (scheduling information for a physical uplink data channel, an example of an UL grant) from a base station, and transmits a Physical Uplink Data Channel physical uplink shared channel, PUSCH) to the BS. After receiving the PUSCH from the UE, the Node B transmits one of the downlink A / N / and / or UL scheduling information to the UE after one slot, or both the UE and the UE. In the FDD system according to an embodiment of the present invention, the uplink HARQ RTT corresponds to four slots and the number of uplink HARQ processes is four.

FIG. 11 is a diagram illustrating downlink HARQ timing of a TDD system according to an embodiment of the present invention, and FIG. 12 is a diagram illustrating uplink HARQ timing of a TDD system according to an embodiment of the present invention.

Referring to FIG. 11, a UE receives a PDSCH from a BS and transmits an uplink A / N to a BS after one slot. The base station receiving the uplink A / N from the UE transmits the PDSCH to the UE after two slots. At this time, when the BS receives the uplink NACK from the UE, the BS can retransmit the PDSCH corresponding to the previously transmitted PDSCH. That is, when the uplink NACK is received at the base station, the PDSCH for correcting the error of the previously transmitted PDSCH can be transmitted from the base station to the mobile station. The downlink HARQ timing of the TDD system may be determined based on the HARQ timing described above regardless of the slot (one slot of the 0th slot, 1th slot, 5th slot or 6th slot) to which the PDSCH is transmitted according to an embodiment of the present invention. . In the TDD system according to an embodiment of the present invention, the downlink HARQ RTT corresponds to five slots and the number of downlink HARQ processes is two.

Referring to FIG. 12, the time interval at which the PUSCH and the downlink A / N and / or UL scheduling information are transmitted may be different according to the slot through which the PUSCH is transmitted. When the PUSCH is transmitted in the second slot, the third slot, the seventh slot and the eighth slot, the UE receives the downlink A / N and / or uplink scheduling information from the base station, Lt; / RTI > The base station receiving the PUSCH from the UE transmits downlink A / N and / or uplink scheduling information to the UE after two slots. Alternatively, if the PUSCH is transmitted in slots 4 and 9, the UE receiving the downlink A / N and / or uplink scheduling information from the base station transmits the PUSCH to the base station after two slots. The base station receiving the PUSCH from the UE transmits downlink A / N and / or uplink scheduling information to the UE after one slot. In the TDD system according to an embodiment of the present invention, the uplink HARQ RTT corresponds to five slots and the number of uplink HARQ processes is three.

As described above, according to the embodiment of the present invention, the round trip time of the HARQ process can be shortened based on the shortened TTI length, and the data transmission rate can be improved accordingly.

13 is a block diagram illustrating a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 13, a wireless communication system according to an embodiment of the present invention includes a base station 1310 and a terminal 1320.

The base station 1310 includes a processor 1311, a memory 1312, and a radio frequency unit (RF unit) 1313. The memory 1312 may be coupled to the processor 1311 to store various information for driving the processor 1311 or at least one program to be executed by the processor 1311. [ The wireless communication unit 1313 is connected to the processor 1311 to transmit and receive a wireless signal. The processor 1311 may implement the functions, processes, or methods suggested by embodiments of the present invention. In this case, the wireless interface protocol layer in the wireless communication system according to an embodiment of the present invention may be implemented by the processor 1311. [ The operation of the base station 1310 according to an embodiment of the present invention may be implemented by the processor 1311. [

The terminal 1320 includes a processor 1321, a memory 1322, and a wireless communication unit 1323. The memory 1322 may be coupled to the processor 1321 to store various information for driving the process 1321. [ The wireless communication unit 1323 may be connected to the processor 1321 to transmit and receive wireless signals. The processor 1321 may implement the functions, steps, or methods suggested by embodiments of the present invention. In this case, in the wireless communication system according to an embodiment of the present invention, the wireless interface protocol layer may be implemented by the processor 1321. The operation of terminal 1320 according to an embodiment of the present invention may be implemented by processor 1321. [

In an embodiment of the present invention, the memory may be located inside or outside the processor, and the memory may be connected to the processor via various means already known. The memory may be any type of volatile or nonvolatile storage medium, e.g., the memory may include read-only memory (ROM) or random access memory (RAM).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (14)

A control channel transmission method of a terminal,
Receiving information on the format of the control channel from the base station via higher layer signaling, and
Transmitting the control channel to the base station through one slot based on information on the format of the control channel
Lt; / RTI >
Wherein the control channel is a control channel mapped to at least one resource block among a plurality of resource blocks located at both ends of a system band. The method of claim 1,
Wherein the control channel is a control channel transmission method that is a control channel mapped to a first resource block located at one end of both ends of the system band and a second resource block located at an opposite end of the system band, . The method of claim 1,
Wherein the resource block is a resource block disposed at the same position at both ends of the system band in units of N consecutive resource blocks. 4. The method of claim 3,
And if N is 2, the resource block is a resource block in which a relative position between the two resource blocks is determined according to whether two consecutive indexed resource blocks are even or odd. 4. The method of claim 3,
Wherein the resource block is a resource block in which a relative position of the i-th resource block with respect to the N resource blocks is determined based on an index of an i-th resource block among N consecutive resource blocks and a modulo operation of the N Channel transmission method. The method of claim 1,
Wherein the transmitting comprises:
If the reception performance of the control channel is poor, transmitting the control channel to the base station through the one slot and the next slot of the one slot based on the information on the format of the control channel
/ RTI > The method of claim 1,
Wherein the receiving comprises:
Receiving information on the format of the control channel from the base station via radio resource control (RRC) signaling or system information
/ RTI > A method for a terminal to perform a Hybrid Automatic Repeat reQuest (HARQ)
Receiving a signal from a base station in a first one of a plurality of slots included in the frame,
Performing an HARQ process of the FDD system for the signal in units of four slots among the plurality of slots when the UE operates in a frequency division duplex (FDD) system, and
Performing a HARQ process of the TDD system for the signal in units of five slots among the plurality of slots when the UE operates in a time division duplex (TDD) system;
Gt; HARQ < / RTI > 9. The method of claim 8,
The step of performing the HARQ process of the FDD system includes:
If the signal is a first physical downlink shared channel, transmitting an uplink ACK or NACK from the first slot to the base station in a second slot that is one slot away from the first slot;
Receiving a second physical downlink shared channel corresponding to the first physical downlink shared channel in a third slot, which is one slot apart from the second slot, when the uplink NACK is transmitted to the base station
Gt; HARQ < / RTI > 9. The method of claim 8,
The step of performing the HARQ process of the FDD system includes:
Transmitting a physical uplink shared channel to the base station in a second slot that is one slot away from the first slot if the first signal is downlink ACK or NACK or uplink scheduling information,
Receiving a downlink ACK or NACK or uplink scheduling information from the base station in a third slot that is one slot away from the second slot;
Gt; HARQ < / RTI > 9. The method of claim 8,
The step of performing the HARQ process of the TDD system includes:
If the first slot is a downlink slot or a special slot and the signal is a first physical downlink shared channel, an uplink ACK or NACK is transmitted from the second slot, which is one slot away from the first slot, to the base station And
Receiving a second physical downlink shared channel corresponding to the first physical downlink shared channel in a third slot spaced by two slots from the second slot when the uplink NACK is transmitted to the base station
Gt; HARQ < / RTI > 12. The method of claim 11,
Wherein the third slot is a downlink slot when the first slot is a downlink slot and the third slot is a special slot when the first slot is a special slot. 9. The method of claim 8,
The step of performing the HARQ process of the TDD system includes:
If the first slot is a special slot and the signal is the downlink ACK or NACK or uplink scheduling information, a physical uplink shared channel ; And
Receiving a downlink ACK or NACK or uplink scheduling information in a special slot located next to the second slot;
Gt; HARQ < / RTI > 9. The method of claim 8,
The step of performing the HARQ process of the TDD system includes:
If the first slot is a downlink slot and the signal is the downlink ACK or NACK or uplink scheduling information, a physical uplink shared channel ; And
Receiving a downlink ACK or NACK or uplink scheduling information in a downlink slot located next to the second slot;
Gt; HARQ < / RTI >

KR1020150136378A 2014-09-29 2015-09-25 Method and apparatus for transmitting and receiving physical channel and signal KR20160037797A (en)

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KR1020140130439 2014-09-29
KR20140130439 2014-09-29
KR20140132484 2014-10-01
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