WO2014109571A1 - 무선 통신 시스템에서 수신확인응답 전송 방법 및 장치 - Google Patents
무선 통신 시스템에서 수신확인응답 전송 방법 및 장치 Download PDFInfo
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- WO2014109571A1 WO2014109571A1 PCT/KR2014/000258 KR2014000258W WO2014109571A1 WO 2014109571 A1 WO2014109571 A1 WO 2014109571A1 KR 2014000258 W KR2014000258 W KR 2014000258W WO 2014109571 A1 WO2014109571 A1 WO 2014109571A1
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- subframe
- downlink
- acknowledgment
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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 signalling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- 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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
Definitions
- the following description relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting an acknowledgment when using an uplink subframe as a downlink subframe.
- FIG. 1 The following description relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting an acknowledgment when using an uplink subframe as a downlink subframe.
- Wireless communication systems have been widely deployed to provide various kinds of communication services such as voice and data.
- a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
- multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (0FDMA) systems, and single carrier (SC-FDMA) systems.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier
- E frequency division multiple access
- MC-FDMA multi-carrier frequency division multiple access
- a method for transmitting an acknowledgment when using an uplink subframe as a downlink subframe in a time division duplex is a technical problem.
- a first technical aspect of the present invention is a method for transmitting an uplink acknowledgment response by a terminal in a wireless communication system, the method comprising: receiving a downlink signal in subframe n; And acknowledgment of the downlink signal to the downlink. And transmitting in a k-th subframe from a subframe in which a signal is received, wherein the resource for acknowledgment in the k-th subframe includes acknowledgment in the k-th subframe according to the first timeline.
- the downlink subframes to be transmitted and the downlink subframes to which the acknowledgment should be transmitted in the kth subframe according to the second timeline it is preferentially allocated to a group of subframes.
- a second technical aspect of the present invention is a terminal device for transmitting an uplink acknowledgment in a wireless communication system, comprising: a receiving module; And a processor, wherein the processor receives a downlink signal in subframe n, and transmits an acknowledgment response for the downlink signal in a kth subframe from the subframe in which the downlink signal is received.
- the resource for acknowledgment in the k-th subframe includes downlink subframes for transmitting the acknowledgment in the k-th subframe and the k-th subframe according to the second timeline.
- in a frame is only one end of the device, which is preferentially allocated to a sub-frame of the first group that are common among the DL subframe to be sent for acknowledgment ungdap.
- the first to second technical aspects of the present invention may include the following.
- the first timeline may be received by the terminal as system information, and the second timeline may be applied when an uplink subframe is converted into a downlink subframe and used.
- At least a part of the resources for the acknowledgment except for the resources allocated to the first group are among subframes in which an acknowledgment should be transmitted in the subframe according to the second timeline. Except for the common subframe, it may be allocated to subframes of the second group.
- Resources allocated to the second group may be continued to resources allocated to the first group.
- the resource allocated to the second group may be spaced apart from the resource allocated to the first group by a predetermined offset.
- a resource allocated to the second group may always be included in a resource for Physical Uplink Control CHannel (PUCCH) Format 3.
- PUCCH Physical Uplink Control CHannel
- the resource allocated to the second group is the one of the subframes of the second group. According to the first timeline, a subframe corresponding to one of a downlink subframe or a special subframe may be preferentially allocated.
- resources for acknowledgment acknowledgment allocated to subframes corresponding to an uplink subframe may be interleaved.
- the downlink signal may be indicated by a physical downlink control channel (PDCCH).
- PDCH physical downlink control channel
- a resource for an acknowledgment response to be repeatedly transmitted may be included only in an uplink subframe in a timeline having the smallest number of uplink subframes among the available in the first and second timelines.
- the terminal When the terminal does not detect a reconfiguration message for the second timeline, the terminal includes a timeline having the smallest number of downlink subframes among the first and second timelines. Monitoring may be performed only in a downlink subframe in.
- the terminal may not transmit an acknowledgment response to the radio frame for which the reset message is not detected.
- the terminal may transmit an acknowledgment only for the subframe in which the monitoring is performed.
- tr 2 is r: ⁇ which represents the resource grid in the downlink slot
- 3 illustrates a structure of a downlink subframe.
- FIG. 5 is a diagram illustrating a format in which PUCCH formats are mapped in an uplink physical resource block.
- FIG. 6 is a diagram illustrating an example of determining a PUCCH resource for ACK / NACK.
- FIG. 7 illustrates a structure of an ACK / NACK channel in case of a normal CP.
- FIG. 8 shows a structure of a CQI channel in the case of a normal CP.
- FIG. 10 illustrates a method of transmitting uplink control information through a PUSCH.
- 11 to 13 are diagrams for explaining an acknowledgment response in TDD.
- 18 is a diagram showing the configuration of a transceiver.
- each component or feature may be considered to be optional unless otherwise stated.
- Each component or feature may be embodied in a form that is not combined with other components or features.
- some components and / or features may be combined to form an embodiment of the present invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for components or features of another embodiment.
- Embodiments of the present invention will be described with reference to the relationship between data transmission and reception between a base station and a terminal.
- the three base stations have a meaning as terminal nodes of a network that directly communicates with a terminal.
- the specific operation described as performed by the base station in this document may in some cases be an upper node of the base station. It may also be performed by).
- a 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), and an access point (AP).
- the repeater may be replaced by terms such as relay node (RN) and relay station (RS).
- RN relay node
- RS relay station
- the term 'terminal' may be replaced with terms such as UE Jser Equipment (MS), Mole le Station (MS), Mole le Subscriber Station (MSS), and SSCSubscriber Station (MSS).
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of wireless access systems, an IEEE 802 system, a 3GPP system, a 3GPP LTE and an LTE-L (LTE-Advanced) system, and a 3GPP2 system. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.
- CDMA Code Division Multiple Access
- FDMA Frequency Division Mult iple Access
- TDMA Time Division Mult iple Access
- OFDMA Orthogonal Frequency Division Mult iple Access
- SC-0 Single Carrier Frequency Division Multiple SC-0.
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UT A) or CDMA2000.
- TDMA may be implemented in a wireless technology such as Global System for Mobile Communications (GSM) / Gene Ra 1 Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile Communications
- GPRS Gene Ra 1 Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
- UTRA is a UMTS lniversal Mobile Telecommunications System It is part.
- 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and employs 0FDMA in downlink and SC—FDMA in uplink.
- LTE-A Advanced is the evolution of 3GPP LTE.
- WiMAX can be described by the IEEE 802.16e standard (WirelessMAN—OFDMA Reference System) and the advanced IEEE 802.16m standard (WirelessMAN-OFDMA Advanced system).
- IEEE 802.16e WiMA—OFDMA Reference System
- advanced IEEE 802.16m WiMA-OFDMA Advanced system
- a structure of a radio frame will be described with reference to FIG. 1.
- uplink / downlink signal packet transmission is performed in units of subframes, and one subframe is defined as a predetermined time interval including a plurality of 0FDM symbols.
- the 3GPP LTE standard supports a type 1 radio frame structure applicable to FDE Frequency Division Duplex (FDE) and a type 2 radio frame structure applicable to TDD (Time Division Duplex).
- FIG. 1 (a) is a diagram illustrating a structure of a type 1 radio frame.
- the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
- the time taken for one subframe to be transmitted is called ⁇ (transmission time interval) interval
- the length of one subframe may be l ms and the length of one slot may be 0.5 ms.
- One slot includes a plurality of 0FDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
- RBs resource blocks
- the 0FDM symbol represents one heartbeat period.
- the 0FDM symbol may also be referred to as an SC-FDMA symbol or symbol period.
- a resource block (RB) is a resource allocation unit and may include a plurality of consecutive subcarriers in one slot.
- the number of 0FDM symbols included in one slot may vary depending on the configuration ( ) 1 ⁇ 1 ⁇ 101) of a cyclic prefix (CP).
- CPs include extended CPs and normal C normal CPs.
- the number of 0FDM symbols included in one slot may be seven.
- the 0FDM symbol is configured by an extended CP, the length of one 0FDM symbol is increased, so that 0FDM included in one slot
- the number of symbols is smaller than that of the normal CP.
- the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the terminal is anisotropic at high speed, an extended CP may be used to further reduce inter-symbol interference.
- one slot When a normal CP is used, one slot includes 7 OFDM symbols and thus one subframe includes 14 OFDM symbols.
- the first two or three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a PDSCHCphysical downlink shared channel.
- PDCCH physical downlink control channel
- FIG. 1B is a diagram illustrating a structure of a type 2 radio frame.
- FIG. Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- One subframe consists of two slots.
- the DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- one subframe consists of two slots regardless of the radio frame type.
- the structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
- FIG. 2 is a diagram illustrating a resource grid in a downlink slot.
- One downlink slot includes seven 0FDM heartbeats in the time domain, and one resource block (RB) is shown to include 12 subcarriers in the frequency domain, but the present invention is not limited thereto.
- one slot includes all 70 FDM symbols, but in the case of an extended CP, one slot may include 6 0 FDM symbols.
- Each element on the resource grid is called a resource element.
- One resource block includes a 12 ⁇ 7 resource element.
- N DL and the number of resource blocks included in the downlink slot depend on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- PDSCH physical downlink shared channel
- Downlink control channels used in the 3GPP LTE system include, for example, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical HARQ indicator channel. (Physical Hybrid automatic repeat request Indicator Channel; PHICH).
- the PCFICH is transmitted in the first OFDM symbol of a subframe and includes information on the number of OFDM symbols used for control channel transmission in the subframe.
- the PHICH includes a HARQ ACK / NACK signal as a response of uplink transmission.
- Control information transmitted through the PDCCH is referred to as downlink control information (DCI).
- DCI includes uplink or downlink scheduling information or an uplink transmit power control command for a certain terminal group.
- the PDCCH includes a resource allocation and transmission format of a DL shared channel (DL-SCH), resource allocation information of a UL shared channel (UL-SCH), paging information of a paging channel (PCH), system information on a DL-SCH, and a PDSCH.
- DL-SCH DL shared channel
- UL-SCH resource allocation information of a UL shared channel
- PCH paging information of a paging channel
- system information on a DL-SCH and a PDSCH.
- Resource allocation of upper layer control messages such as random access responses transmitted to the network, a set of transmit power control commands for individual terminals in a certain terminal group, transmission power control information, activation of VoIP voice over IP, etc. It may include.
- a plurality of PDCCHs may be transmitted in the control region.
- the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted in an aggregate of one or more consecutive Control Channel Elements (CCEs).
- CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
- the CCE processes multiple resource element groups.
- the format of the PDCCH and the number of available bits are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- the base station determines the PDCCH format according to the DCI transmitted to the terminal, and adds a cyclic redundancy check (CRC) to the control information.
- CRC cyclic redundancy check
- the CRC is masked with an identifier called Radio Network Temporary Identifier (RNTI) according to the owner or purpose of the PDCCH. If the PDCCH is for a specific terminal, the cell— RNTHC— RNTI) identifier of the terminal is assigned to the CRC. Can be masked. Or, if the PDCCH is for a paging message, a paging indicator identifier (P-RNTI) may be masked to the CRC.
- RNTI Radio Network Temporary Identifier
- the system information identifier and system information RNTKSI-RNTI may be masked to the CRC.
- random access -RNTKRA-RNTI may be masked to the CRC.
- the uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) including uplink control information is allocated to the control region.
- a physical uplink shared channel (PUSCH) including user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- one UE does not simultaneously transmit a PUCCH and a PUSCH.
- PUCCH for one UE is allocated to an RB pair in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. This is called that the resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- the uplink control information (UCI) transmitted through the PUCCH may include a scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.
- SR scheduling request
- HARQ ACK / NACK information HARQ ACK / NACK information
- the HARQ ACK / NACK information may be generated according to whether the decoding of the downlink data packet on the PDSCH is successful.
- 1 bit is transmitted as ACK / NACK information for downlink single codeword transmission, and 2 bits are transmitted as ACK / NACK information for downlink 2 codeword transmission.
- the channel measurement information refers to feedback information related to a multiple input multiple output (MIMO) technique, and includes a channel quality indicator (CQI), a precoding matrix index (PMI), and a tank. It may include an indicator (Rank Indicator (RI)). These channel measurement information may be collectively expressed as CQI. 20 bits per subframe may be used for transmission of the CQI.
- MIMO multiple input multiple output
- RI Rank Indicator
- PUCCH is Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift (QPSK). Can be modulated using a keying technique.
- Control information of a plurality of terminals may be transmitted through a PUCCH, and a length of 12 CAZAC Consistant Amplitude Zero Autocorrelation (CSM) sequence is performed when code division multiplexing (CDM) is performed to distinguish signals of respective terminals.
- CSM Consistant Amplitude Zero Autocorrelation
- the CAZAC sequence has the ability to maintain a constant amplitude in the time domain and the frequency domain, the coverage is reduced by lowering the Peak-to-Average Power Ratio (PAPR) or the Cubic Metric (CM) of the UE. It has a suitable property to increase.
- PAPR Peak-to-Average Power Ratio
- CM Cubic Metric
- ACK / NACK information for downlink data transmission transmitted through the PUCCH is covered using an orthogonal sequential or an orthogonal cover (0
- control information transmitted on the PUCCH may be distinguished using a cyclically shifted sequence having different cyclic shift (CS) values.
- the cyclically shifted sequence may be generated by cyclically shifting a base sequence by a specific eye lie shift amount.
- the specific CS amount is indicated by the cyclic shift index (CS index).
- CS index cyclic shift index
- the number of available cyclic shifts may vary.
- sequences may be used as basic sequences, and the above-described CAZAC sequence is an example.
- the amount of control information that the UE can transmit in one subframe is the number of SC-FDMA symbols available for transmission of control information (that is, a reference signal (RS) for coherent detection of PUCCH. ) May be determined according to SC-FDMA symbols except for SC-FDMA symbols used for transmission.
- SC-FDMA symbols that is, a reference signal (RS) for coherent detection of PUCCH.
- PUCCH is defined in seven different formats according to transmitted control information, modulation scheme, amount of control information, and the like, and includes uplink control information transmitted according to each PUCCH format; UCI) properties can be summarized as shown in Table 1 below.
- PUCCH format 1 is used for single transmission of an SR. In the case of SR transmission alone, an unmodulated waveform is applied, which will be described in detail later.
- the PUCCH format la or lb is used for transmission of HARQ ACK / NACK.
- PUCCH format la or lb may be used.
- HARQ ACK / NACK and SR may be transmitted in the same subframe using PUCCH format la or lb.
- PUCCH format 2 is used for transmission of CQI
- PUCCH format 2a or 2b is used for transmission of CQI and HARQ ACK / NACK.
- PUCCH format 2 may be used for transmission of CQI and HARQ ACK / NACK.
- FIG. 5 illustrates a form in which PUCCH formats are mapped to PUCCH regions in an uplink physical resource block.
- a / RB represents the number of resource blocks in the uplink
- PUCCH format 2 / 2a / 2b is mapped to a PUCCH region denoted by ⁇ ), 1, which means that the PUCCH format 2 / 2a / 2b is located at a band-edge. It can be expressed as being mapped to blocks.
- the number of PUCCH RBs available by the PUCCH format 2 / 2a / 2b () may be indicated to terminals in a cell by broadcasting signaling.
- the UE is allocated from the base station (BS) by a PUCCH resource for transmission of uplink link control information (UCI), by an explicit method or an implicit method through higher layer signaling.
- BS base station
- UCI uplink link control information
- a plurality of PUCCH resource candidates may be configured for a UE by an upper layer, and which PUCCH resource is used implicitly Can be determined in a manner.
- the UE may transmit an ACK / NACK for a corresponding data unit through a PUCCH resource implicitly determined by a PDCCH resource that receives a PDSCH from a BS and carries scheduling information for the PDSCH.
- FIG. 6 shows an example of determining a PUCCH resource for ACK / NACK.
- the PUCCH resources for ACK / NACK are not pre-allocated to each UE, and a plurality of PUCCH resources are divided and used at every time point by a plurality of UEs in a cell.
- the PUCCH resource used by the UE to transmit ACK / NACK is determined in an implicit manner based on the PDCCH carrying scheduling information for the PDSCH carrying corresponding downlink data.
- the entire region in which the PDCCH is transmitted in each DL subframe consists of a plurality of control channel elements (CCEs), and the PDCCH transmitted to the UE consists of one or more CCEs.
- the CCE includes a plurality (eg, nine) Resource Element Groups (REGs).
- One REG is composed of four neighboring REs (RE) except for a reference signal (RS).
- the UE implicit PUCCH resource derived by calculating a black or black by a function of a specific CCE index (for example, the first black is the lowest CCE index) among the index of the CCEs constituting the received PDCCH Send ACK / NACK through.
- each PUCCH resource index is treated with a PUCCH resource for ACK / NACK.
- the UE derives or calculates the index from the 4th CCE, the lowest CCE constituting the PDCCH
- the ACK / NACK is transmitted to the BS through the PUCCH, for example, the 4th PUCCH.
- the PUCCH resource index may be determined as follows.
- Equation 1 r i PUCCH CCE ⁇ ⁇ PUCCH [74] where n CCH represents a PUCCH resource index for ACK / NACK transmission,
- Np ccH represents a signaling value received from a higher layer.
- n CCE ⁇ PDCCH It may represent the smallest value among the CCE indexes used for transmission.
- a symbol modulated using a BPSK or QPSK modulation scheme is multiply multiplied by a length 12 CAZAC sequence.
- y (0), ..., y (N-l) symbols may be referred to as a block of symbols.
- block-wise spreading using an orthogonal sequence is applied.
- a Hadamard sequence of length 4 is used for general ACK / NACK information, and a Discrete Fourier Transform (DFT) sequence of length 3 is used for shortened ACK / NACK information and a reference signal. Used.
- a Hadamard sequence of length 2 is used for the reference signal in the case of an extended CP.
- FIG. 7 shows a structure of an ACK / NACK channel in case of a normal CP.
- 7 exemplarily shows a PUCCH channel structure for HARQ ACK / NACK transmission without CQI.
- a reference signal (RS) is carried on three consecutive SC-FDMA symbols in the middle of seven SC-FDMA symbols included in one slot, and an ACK / NACK signal is carried on the remaining four SC-FDMA symbols.
- RS may be carried on two consecutive symbols in the middle.
- the number and position of symbols used for the RS may vary depending on the control channel, and the number and position of symbols used for the ACK / NACK signal associated therewith may also be changed accordingly.
- the acknowledgment information (non-scrambled state) of one bit and two bits may be represented by one HARQ ACK / NACK modulation symbol using BPSK and QPSK modulation techniques, respectively.
- the acknowledgment (ACK) may be encoded as' 1 ', and the negative acknowledgment (NACK) may be encoded as'.
- two-dimensional spreading is applied to increase the multiplexing capacity. That is, in order to increase the number of terminals or control channels that can be multiplexed, frequency domain spreading and time domain spreading are applied at landing.
- the frequency domain sequence is used as the basic sequence.
- the frequency domain sequence is Zadoff-Chu (ZC), one of the CAZAC sequences. You can use sequences. For example, different cyclic shifts (CS) are applied to a ZC sequence, which is a basic sequence, so that multiplexing of different terminals or different control channels may be applied.
- ZC Zadoff-Chu
- CS cyclic shifts
- the number of CS resources supported in an SC-FDMA symbol is determined by cell-specific higher-layer signaling.
- the frequency domain spread ACK / NACK signal is spread in the time domain using an orthogonal spreading code.
- an orthogonal spreading code a Walsh-Hadamard sequence or a DFT sequence may be used.
- the ACK / NACK signal may be spread using an orthogonal sequence of length 4 ( W 0, wl, w 2, w 3) for 4 symbols.
- RS is also spread through an orthogonal sequence of length 3 or length 2. This is called orthogonal covering (0C).
- a plurality of terminals may be multiplexed using a code division multiplex (CDM) scheme using the CS resource in the frequency domain and the 0C resource in the time domain as described above. That is, ACK / NACK information and RS of a large number of terminals may be multiplexed on the same PUCCH RB.
- CDM code division multiplex
- the number of spreading codes supported for ACK / NACK information is limited by the number of RS symbols. That is, since the number of RS transmission SC-FDMA symbols is smaller than the number of ACK / NACK information transmission SC-FDMA symbols, the multiplexing capacity of the RS is smaller than that of the ACK / NACK information.
- ACK / NACK information may be transmitted in four symbols.
- three orthogonal spreading codes are used instead of four, which means that the number of RS transmission symbols is three. This is because only three orthogonal spreading codes can be used for the RS.
- Tables 2 and 3 Examples of orthogonal sequences used for spreading ACK / NACK information are shown in Tables 2 and 3.
- Table 2 shows a sequence for length 4 symbols
- Table 3 shows a sequence for length 3 symbols.
- the sequence for the length 4 symbol is used in PUCCH format 1 / la / lb of a general subframe configuration. In the subframe configuration, taking into account the case that a SRS (Sounding Reference Signal) is transmitted in the last symbol of the second slot, In the first slot, the sequence for the length 4 symbol is applied, and in the second slot, the sequence of the shortened PUCCH 'format 1 / la / lb for the length 3 symbol may be applied.
- SRS Sounding Reference Signal
- HARQ acknowledgments from a total of 12 different terminals can be multiplexed in one PUCCH RB.
- the scheduling request is transmitted in a manner that requests or does not request that the terminal be scheduled.
- the SR channel reuses the ACK / NACK channel structure in the PUCCH format la / lb and is configured in a 00K (0n-0ff Keying) scheme based on the ACK / NACK channel design.
- the reference signal Not sent. Therefore, a sequence of length 7 is used for a general CP, and a sequence of length 6 is used for an extended CP.
- Different cyclic shifts or orthogonal covers may be assigned for SR and ACK / NACK. That is, for positive SR transmission, the UE transmits HARQ ACK / NACK through resources allocated for SR. For negative SR transmission, the UE transmits HARQ ACK / NACK through a resource allocated for ACK / NACK.
- PUCCH format 2 / 2a / 2b is a control channel for transmitting channel measurement feedback (CQI, PMI, RI).
- the reporting period of the channel measurement feedback (hereinafter collectively referred to as CQI information) and the frequency unit (or frequency resolution) to be measured may be controlled by the base station.
- CQI information channel measurement feedback
- the frequency unit (or frequency resolution) to be measured may be controlled by the base station.
- Periodic and aperiodic CQI reporting can be supported in the time domain.
- PUCCH format 2 may be used only for periodic reporting and PUSCH may be used for aperiodic reporting.
- the base station may instruct the terminal to transmit an individual CQI report on a resource scheduled for uplink data transmission.
- SC-FDMA symbols 1 and 5 (second and sixth symbols) of SC-FDMA symbols 0 to 6 of one slot are used for demodulation reference signal (DMRS) transmission, and CQI in the remaining SC-FDMA symbols.
- Information can be transmitted.
- SC-FDMA symbol 3 is used for DMRS transmission.
- PUCCH format 2 / 2a / 2b modulation by a CAZAC sequence is supported, and a QPSK modulated symbol is multiplied by a length 12 CAZAC sequence.
- the cyclic shift (CS) of the sequence is changed between the symbol and the slot. Orthogonal covering is used for DMRS.
- a reference signal is carried on two SC-FDMA symbols spaced by three SC-FDMA symbol intervals among seven SC-FDMA symbols included in one slot, and CQI information is carried on the remaining five SC-FDMA symbols. Is loaded. Two RSs are used in one slot to support high speed terminals.
- each terminal is distinguished using a cyclic shift (CS) sequence.
- the CQI information symbols are modulated and transmitted throughout the SC-FDMA symbol, and the SC-FDMA symbol is composed of one sequence. That is, the terminal modulates and transmits CQI in each sequence.
- the number of symbols that can be transmitted in one ⁇ is 10, and modulation of CQI information is determined up to QPSK.
- a 2-bit CQI value may be carried, and thus a 10-bit CQI value may be loaded in one slot. Therefore, a CQI value of up to 20 bits can be loaded in one subframe.
- a frequency domain spread code is used to spread the CQI information in the frequency domain.
- a frequency-domain spreading code may use a CAZAC sequence of length -12 (eg, ZC sequence). Each control channel may be distinguished by applying a CAZAC sequence having a different cyclic shift value. IFFT is performed on the frequency domain spread CQI information.
- 12 different terminals may be orthogonally multiplexed on the same PUCCH RB by means of 12 equally spaced cyclic shifts.
- the DMRS sequence on SC-FDMA symbol 1 and 5 (on SC-FDMA symbol 3 in extended CP case) in the general CP case is similar to the CQI signal sequence in the frequency domain but no modulation such as CQI information is applied.
- PUCCH resource index can be set semi-statically by higher layer signaling to report different CQI PMI and RI types periodically on PUCCH resources indicated by n Pi / cc / 0, where PUCCH resources index ( ) Is information indicating a PUCCH region used for PUCCH format 2 / 2a / 2b transmission and a cyclic shift (CS) value to be used.
- PUCCH resources index ( ) Is information indicating a PUCCH region used for PUCCH format 2 / 2a / 2b transmission and a cyclic shift (CS) value to be used.
- the e-PUCCH may correspond to PUCCH format 3 of the LTE-A system.
- Block spreading can be applied to ACK / NACK transmission using PUCCH format 3.
- the block spreading scheme modulates control signal transmission using the SC-FDMA scheme.
- a symbol sequence may be spread and transmitted in a time domain using an OCCCOrthogonal Cover Code.
- control signals of a plurality of terminals may be multiplexed on the same RB.
- one symbol sequence is transmitted over a time domain and control signals of a plurality of terminals are multiplexed using a CS cyclic shift of a CAZAC sequence, while a block spread based PUCCH format (eg, In case of PUCCH format 3), one symbol sequence Transmitted over the frequency domain, and control signals of a plurality of terminals are multiplexed using time domain spreading using 0CC.
- a block spread based PUCCH format eg, In case of PUCCH format 3
- an RS symbol may be generated from a CAZAC sequence to which a specific cyclic shift value is applied, and may be transmitted in a form in which a predetermined 0CC is applied (or multiplied) over a plurality of RS symbols.
- control information having an extended size can be transmitted as compared to the PUCCH format 1 series and 2 series.
- the contents of the ACK / NACK response for a plurality of data units may be a combination of one of the ACK / NACK unit and QPSK modulated symbols used in the actual ACK / NACK transmission. combination).
- one ACK / NACK unit carries two bits of information, and that a maximum of two data units are received.
- the HARQ acknowledgment for each received data unit is represented by one ACK / NACK bit.
- the transmitting end transmitting the data shows the ACK / NACK result as shown in Table 4 below. Can be identified.
- DTX Discont inuous Transmission
- PUCCH ' X represents an ACK / NACK unit used for the actual ACK / NACK transmission. If there are at most two ACK / NACK units, they may be represented by "cCH'O and"ilicCH'l". Also, 6 (0) ⁇ (1) is two bits transmitted by the selected ACK / NACK unit. Indicates. The modulation symbol transmitted through the ACK / NACK unit is determined according to the ⁇ 0 ) ⁇ 1 ) bits.
- the receiving end uses two bits using the ACK / NACK unit PUCCH ' 1 . Send (1, 1).
- the receiving end when the receiving end receives two data units, it fails to decode (or detect) the first data unit (ie, data unit 0 corresponding to HARQ-ACK (O)) and the second data unit (ie, If decoding of data unit 1 corresponding to HARQ-ACK (l) is successful (i.e., in case of NACK / DTX and ACK in Table 4), the receiving end uses two bits using the ACK / NACK unit PUG TM ' 1 . Send (0, 0).
- the actual bits of the ACK / NACK unit selected and transmitted are selected.
- the combination of information that is, as in Table 4, select one of the "PUCCH'O or" PUCCH 'l
- ACK / NACK information for a plurality of data units can be transmitted using one ACK / NACK unit. Will be.
- ACK / NACK multiplexing By extending the above-described principle of ACK / NACK multiplexing as it is, ACK / NACK multiplexing for more than 2 data units can be easily implemented.
- NACK and DTX may not be distinguished (that is, represented by NACK / DTX in Table 4 above). As such, NACK and DTX may be coupled). This is because all ACK / NACK states (that is, ACK / NACK hypotheses) that can occur when NACK and DTX are to be expressed separately can be reflected by a combination of an ACK / NACK unit and a QPSK modulated symbol. Because there is not.
- NACK when there is no ACK for all data units (i.e., only NACK or DTX exists for all data units), only one of the HARQ—ACK (i) is definitely NACK (i.e. distinguished from DTX).
- One certain NACK case may be defined. In such a case, an ACK / NACK unit that speaks to a data unit corresponding to one certain NACK may be reserved for transmitting signals of a plurality of ACK / NACKs.
- PAPR Peak-to-Average
- CMCCubic metric CMCCubic metric
- This single carrier characteristic is broken when DFT-precoding data is discontinuously allocated on the frequency axis or when PUSCH and PUCCH are simultaneously transmitted.
- uplink control to be transmitted on the PUCCH to maintain a single carrier characteristic. information Piggybacks the information with the data through the PUSCH.
- a method of multiplexing UCKCQI / PMI, HARQ-ACK, RI, etc.) in a PUSCH region is used in a subframe in which the PUSCH is transmitted.
- UL-SCH data and CQI / PMI may be multiplexed before DF-spreading to transmit control information and data together.
- UL-SCH data performs rate-matching in consideration of CQI / PMI resources.
- control information such as HARQ ACK and RI may be multiplexed in the PUSCH region by puncturing UL-SCH data.
- EPDCCH Enhanced-PDCCH
- DMRS Downlink Reference Signal
- EPDCCH transmission may be divided into localized EPDCCH transmission and distributed EPDCCH transmission according to a configuration of a PRB (Physical Resource Block) pair used for EPDCCH transmission.
- Local EPDCCH transmission refers to a case where ECCE used for one DCI transmission is adjacent in the frequency domain, and specific precoding may be applied to obtain beamforming gain. For example, local EPDCCH transmission may be based on the number of consecutive ECCEs corresponding to the aggregation level.
- distributed EPDCCH transmission means that one EPDCCH is transmitted in a PRB pair separated in the frequency domain, and has a gain in terms of frequency diversity.
- distributed EPDCCH transmission may be based on an ECCE consisting of four EREGs included in each PRB pair separated in the frequency domain.
- One or two EPDCCH PRB sets may be configured in the UE by higher layer signaling or the like, and each EPDCCH PRB set may be for either local EDPCCH transmission or distributed EPDCCH transmission.
- the UE In order to receive / acquire control information (DCI) through EPDCCH, the UE is based on existing LTE / LTE-A. Similar to the system, blind decoding can be performed. In more detail, the UE may attempt (monitor) decoding a set of EPDCCH candidates for each aggregation level for DCI formats corresponding to the configured transmission mode.
- the set of EPDCCH candidates to be monitored may be called an EPDCCH terminal specific search space, and this search space may be set / configured for each aggregation level.
- the aggregation level is somewhat different from the existing LTE / LTE-A system described above, depending on the subframe type, the length of the CP, the amount of available resources in the PRB pair, and the like ⁇ 1, 2, 4, 8, 16, 32 ⁇ . Is possible.
- indexes of REs included in a PRB pair set are indexed into an EREG, and the EREG is indexed again in units of ECCE. Based on this indexed ECCE, control information can be received by determining the EPDCCH candidate constituting the search space and performing blind decoding.
- EREG is a concept in which the REG of the existing LTE / LTE-A is the ECCE in the CCE, and one PRB pair may include 16 EREGs.
- the UE may transmit an acknowledgment response (ACK / NACK / DTX) for the EPDCCH on the PUCCH.
- the index of the resource used that is, the PUCCH resource may be determined by the lowest ECCE index among the ECCEs used for EPDCCH transmission similarly to Equation 1 described above. That is, it can be represented by the following equation (2).
- n PUCCH-ECCE is the PUCCH resource index, n ECCE.
- i PUCCH and EPDCCH are a value transmitted through higher layer signaling and means a point where a PUCCH resource index starts.
- AR0 avoids stratification of the PUCCH resource by shifting the PUCCH resource determined by the start offset of the PUCCH resource delivered to the lowest ECCE index and higher layer signaling among the ECCE indexes constituting the EPDCCH.
- AR0 is indicated as shown in Table 5 through 2 bits of DCI format 1A / 1B / 1D / 1 / 2A / 2 / 2B / 2C / 2D transmitted through the EPDCCH.
- the base station may designate one of the AR0 values of Table 5 for the specific terminal and inform the specific terminal of the AR0 to use when determining the PUCCH resource through the DCI format.
- the UE detects the AR0 field in its DCI format and may transmit an acknowledgment response through the PUCCH resource determined using this value.
- TDD is uplink (UU and downlink (DL) is not separated on the frequency band, a plurality of downlink subframes (PDSCH) in one uplink subframe)
- a shows an uplink-downlink configuration used in TDD
- 11 (b) shows an acknowledgment response in the case of TDD uplink-downlink configuration 2.
- the number of subframes available for uplink is 2 times. It is limited to subframe 7. Therefore, two acknowledgment responses for 8 downlink subframes (including special subframes) are transmitted through two uplink subframes (subframe 2 and subframe 7). Need to send To this end, downlink association set indexes are defined as shown in Table 6 below.
- the downlink association set K consists of elements of ⁇ ,,, ' ⁇ ⁇ knee ⁇ in each uplink subframe, and M (bundling window size) is a downlink sub-subframe for transmitting an acknowledgment response in the association set K. It means the number of frames.
- the number in the first row in each uplink-downlink configuration of Table 6 indicates how many subframes are downlink subframes prior to the current uplink subframe. For example, in the case of uplink-downlink configuration 2, as shown in FIG. 11 (b), subframe 2 is the 8, 7, 4, 6th subframe preceding subframe 2 (ie, Transmits an acknowledgment of # 4, # 5, # 8, and 6) of the previous radio frame.
- each uplink-downlink configuration is indicated by the number of subframes indicated by the number of the first row.
- 4 ⁇ 5, 8, and 6 are displayed in the second row, which is the number of the downlink subframe to which the acknowledgment response should be transmitted in subframe No. 2.
- parentheses () is a subframe of the previous radio frame
- parentheses [] indicate the current radio If it is a subframe of the frame, and the parentheses are similar, the second previous. This means that it is a surf frame of a radio frame.
- the PUCCH resource for the transmission of the acknowledgment response in the TDD may be allocated by Equation 3 below.
- ⁇ PUUCCCCHH (VM "-ml A ) 'N c c + 1 mN ⁇ ' c c + + l 1 + '""C C C C E E., M m + 1' PUCCH
- Equation 3 is an antenna port, ⁇ ⁇ CCH is a value transmitted to higher layer signaling, Is the first CCE used for PDCCH transmission in subframe m, m is set k, the smallest value for detecting the PDCCH, c is the UE for N c ⁇ n co ⁇ N c 2 , 3 ⁇ .
- FIG. 12 shows an example of PUCCH resource allocation based on the above equation.
- resources for acknowledgment of three downlink subframes (1 st sf, 2 nd sf, and 3 rd sf) are allocated, and three CCE groups (CCE groups 1 to 3, approximately 1 OFDM per group) Symbol) is present.
- CCE groups 1 to 3, approximately 1 OFDM per group) Symbol are present.
- PUCCH resource allocation for each downlink subframe in an uplink subframe is sequentially allocated PUCCH resources for three downlink subframes in a first CCE group (CCE group 1). Stack / pack. Then, PUCCH resources are allocated to the second and third CCE groups in the same manner.
- the downlink subframes are different, even though the CCE index is the same, they have different PUCCH resources, so that no collision occurs.
- one downlink subframe does not transmit PDCCHs having the same CCE index to different UEs, no stratification occurs.
- the PUCCH resource for the J-th EPDCCH-PRB set of the m- th subframe may be determined by Equation 4 below.
- a ARO ⁇ [-2 -llO, 2
- PUCCH and j are PUCCH resources.
- PUCCH resources are sequentially attached to each EPDCCH PRB set in the order of the association set. Resource allocation method is used.
- subframe 2 corresponds to association set ⁇ 13, 12, 9, 8, 7, 5, 4, 11, 6 ⁇ .
- the PUCCH resource region for the subframes is reserved.
- FIG. 12 shows such an example.
- each block is a PUCCH resource region for each subframe corresponding to an association set, and is an index of a downlink subframe to be transmitted in subframe 2 (ie, an association).
- each subframe (except for a special subframe for switching between uplink and downlink) is preconfigured so that each is used for either uplink or downlink.
- Uplink Downlink Configuration In case of 0, subframes 0 and 5 are used for downlink in one radio frame, and subframes 2, 3, 4, 7, 8, and 9 are uplink. It is preset to be used for.
- the uplink-downlink configuration to be used by a particular base station may be provided to the terminal as part of system information (eg, SIB 1).
- SIB 1 system information
- adjacent base stations may be forced to use the same TDD configuration, that is, uplink-downlink configuration, for reasons of interference and the like.
- the uplink for the smooth transmission of the data.
- the efficiency may be improved by changing one or more subframes set as a link to use for downlink or vice versa by changing / switching one or more subframes set as a downlink to uplink.
- Table 8 shows a case in which a change in the switching period is allowed, and when the change in the switching period is impossible, the subframes available for switching to the downlink are shown in shaded in Table 9.
- the TDD uplink-downlink configuration after the switching should be any one of the configuration of Table 7.
- the uplink-downlink configuration 0 subframe # 4 is converted to the downlink subframe, it means that subframe # 9 must be simultaneously switched to the downlink subframe.
- the 1-bit can tell whether or not the link configuration has changed.
- the HARQ timeline is the existing TDD. Any one of an uplink-downlink configuration in may be used. That is, in a system in which a subframe in which resources are dynamically changed may be referred to as a HARQ reference timeline, a DL reference HARQ timeline, or a DL reference UL / DL conf igurat ion, hereinafter, referred to as a DL HARQ timeline May be defined).
- the HARQ reference timeline may be a TDD configuration for HARQ timing that operates regardless of whether a resource is dynamically changed, or may be a TDD configuration of a situation where a resource is currently dynamically changed.
- the following timelines may be configured for the terminal. i) HARQ timeline for uplink-downlink configuration indicated by SIB, ii) received at a specific time DL reference HARQ timeline on when to transmit HARQ-ACK for PDSCH / PDCCH for 3 ⁇ 3 ⁇ 336 (carrier aggregation for different TDD configurations defines a DL reference HARQ timeline.
- HARQ timeline for uplink-downlink configuration indicated by SIB ii) received at a specific time DL reference HARQ timeline on when to transmit HARQ-ACK for PDSCH / PDCCH for 3 ⁇ 3 ⁇ 336 (carrier aggregation for different TDD configurations defines a DL reference HARQ timeline.
- the specific SF in the interval may cause ambiguity on the HARQ timeline, and such exceptional SF transmits the HARQ ACK in a separate indicated subframe other than the aforementioned HARQ timeline. If there is such a terminal, the PUCCH resource allocation method should be determined.
- terminals may i) all follow the same timeline of the SIB standard, and ii) terminals of the first attribute (eg, terminals or legacy UEs without elMTA capability).
- the L-UE will be referred to as a timeline based on the SIB, and terminals (eg, UEs with elMTA capability or advanced UE or A-UE) having a second attribute. ) May follow the newly defined HARQ timeline.
- terminals eg, UEs with elMTA capability or advanced UE or A-UE having a second attribute.
- iii) all terminals may follow a newly defined HARQ timeline other than SIB.
- the PUCCH resource is reserved in advance for downlink subframes that need to transmit an acknowledgment response in one uplink subframe. Therefore, when only one timeline is used, no stratification occurs. However, as shown in the above example, if the LUE and the AUE use different HARQ timelines, stratification may occur. For example, as shown in Table 10, the LUE converts the uplink-downlink configuration 1 into the HARQ timeline (first timeline), and the AUE converts the uplink-downlink configuration 2 into the HARQ timeline (second timeline). In case of use, a downlink subframe in which an acknowledgment should be transmitted in an uplink subframe No.
- LUE is an acknowledgment response of a downlink subframe of 5 and 6, and an AUE is 4, 5, 8, and 6 downlink.
- the acknowledgment of the link subframe must be transmitted).
- CCE / ECCE indexes for different downlink subframes in the same PUCCH resource region by using CCE / ECCE indexes for different downlink subframes in the same PUCCH resource region, a layer collision may occur in the PUCCH resource.
- the resource for the acknowledgment in the k-th subframe may be a timeline for the first timeline (LUE).
- LUE first timeline
- the resource for acknowledgment in the k-th subframe is determined according to the downlink subframes for transmitting the acknowledgment in the k-th subframe and the second timeline in accordance with the first timeline.
- Priority is given to subframe (s) of group 1, which is common among downlink subframes in which an acknowledgment response should be transmitted in the kth subframe. Is assigned.
- an uplink-downlink configuration 0 is used as a first timeline
- an uplink-downlink configuration 2 is used as a second timeline
- an uplink number 2 is used.
- downlink subframe # 6 in which an acknowledgment should be transmitted in an uplink subframe 2 according to the first timeline and in uplink in the second timeline according to a second timeline
- PUCCH resources for the 6th downlink subframe that are common among 4, 5, 8, and 6 downlink subframes that need to transmit an acknowledgment in the subframe may be preferentially allocated.
- PUCCH resources for a common sixth downlink subframe are allocated first.
- FIG. 15A illustrates a case where a downlink signal is received through a PDCCH
- FIG. 15B illustrates a case where a downlink signal is received through an EPDCCH.
- the resources allocated to the subframe (s) of the second group may be contiguous to the resources allocated to the subframe (s) of the first group or may be started after being spaced by a predetermined offset.
- the resource allocated to the subframe (s) of the second group may be included in a resource for a PUCCH format different from the PUCCH format for transmitting an acknowledgment of the subframe (s) of the first group.
- PUCCH resources for the two groups of subframe (s) may be transmitted (always) in PUCCH format 3.
- the subframe (s) of the second group are further subdivided and downlinked. Resources may be allocated sequentially according to the nature of the subframe (fixed / static or flexible).
- the fixed / static subframe may correspond to one of a downlink subframe or a special subframe according to the first timeline.
- the flexible subframe may mean a subframe not indicated as a downlink subframe or a special subframe in the first timeline.
- the greater flexibility means a subframe having a larger subframe number among consecutive uplink subframes.
- PUCCH resources may be allocated to fixed / static subframes among two groups of subframe (s) first, and then sequentially allocated to flexible subframes.
- a subframe having low flexibility may be allocated with PUCCH resources before the subframe having high flexibility.
- PUCCH resources of subframes having the same property and configured as PDCCH may be interleaved for each OFDM symbol.
- the rest A resource for acknowledgment response may be allocated to downlink subframes 4, 5, and 8.
- PUCCH resources may be allocated to subframe 5, which is a fixed / static subframe among 4, 5, and 8 downlink subframes, and PUCCH resources may be allocated to 4, 8 downlink subframes, which are flexible subframes. have.
- PUCCH resources of subframes configured as PDCCH may be interleaved as shown in FIG. 15 (a).
- the first embodiment uses an implicit PUCCH resource mapping scheme (CCE / ECCE index) for a downlink subframe such as an L-UE among downlink subframes of an A-UE in a bundling window.
- CCE / ECCE index implicit PUCCH resource mapping scheme
- PUCCH resource in the region indicated by the upper layer signal this may mean to use the PUCCH format 3, additional PUCCH resource start off, in addition to the PUCCH resource start offset common to the L-UE to the A-UE as a higher layer set is allocated It may be understood that the PUCCH resource location is specified as ().
- the allocation of the PUCCH resources according to the first embodiment may be as follows.
- the L-UE packs the PUCCH resources in a conventional manner.
- A-UE first performs packing on the downlink subframe i) common to L-UE, and then concatenates and packs a downlink subframe that monitors only A-UE after the packing window of the L-UE.
- the flexible subframe is preferably packed after the PUCCH region of the fixed downlink subframe.
- the packing may be preferentially performed for each PDCCH symbol among fixed downlink subframes or flexible subframes among fixed subframes for which only the UE is checked.
- the PUCCH resource collision between A-UE and L-UE can be prevented, and by placing flexible SF backwards in A-UE, the PUCCH area can be reduced when the flexible subframe is not monitored.
- Only some (specific subsets) of the above descriptions may optionally be applied to the A-UE.
- the rules applied by the PDCCH and the EPDCCH may be different. For example, only i) in the above description may be applied to the AUE.
- the second embodiment informs that there is a change of an uplink subframe into a downlink subframe through a DAKDownlink Allocation Index, and assumes that the UE is allocated the same number of downlink subframes as the AUE.
- the base station allocates a DAI based on a TDD uplink-downlink configuration such as an AUE in a PDCCH / EPDCCH in which an LUE is scheduled. In this case, the LUE is used It is determined that the changed subframe is missed and the PUCCH resource allocation uses the same uplink-downlink configuration for both the LIE and the AUE.
- This scheme allows both the L—UE and the A-UE to perform HARQ operations on the phase 2 timeline, thereby partially avoiding PUCCH resource stratification.
- the LIE applies the channel selection table based on the second timeline in the PUCCH format lb with channel selection.
- Disadvantages include the disadvantage that L—the UE transmits unnecessary DTX or uses PUCCH format 3 or performs A / N bundling even though the number of downlink subframes linked to one uplink subframe has not actually exceeded 4 Can be.
- a third embodiment of the present invention is to allocate different PUCCH starting offsets to AUEs and LUEs when PUCCH resources are allocated. At this time, the PUCCH start offset may be transmitted to higher layer signaling.
- Embodiment 4 relates to a case in which a downlink subframe in which the LUE should transmit an acknowledgment in a specific uplink subframe is a continuous subset in a downlink subframe in which the AUE should transmit an acknowledgment.
- the PUCCH start offset is allocated to the AUE and the LUE in the same manner, but the UE that detects the usage change indication of the subframe among the AUEs has the number of downlink subframes linked to the corresponding uplink subframe (that is, in an uplink subframe). If the number of downlink subframes to which the acknowledgment is to be transmitted is different from the LUE, an additional offset (PUCCH resource stacking offset) may be applied by calculating the CCE index according to the difference. 5 more allocated to A-UE The number of CCEs / ECCEs included in the downlink subframe may be applied as an offset, and the subframe usage change indication received to the upper layer may be used as an indicator of this offset.
- the UE that detects a usage change instruction is The starting position of the PUCCH resource may be determined by subtracting the number of CCEs (when scheduled with PDCCH) or ECCEs (when scheduled with EPDCCH) included in the 4th downlink subframe from the PUCCH resource starting offset (PUCCH). At this time, the start position of the newly set PUCCH resource for A-UE
- N CCEIECCE A -Number of CCEs / ECCEs in the downlink subframe newly allocated to the UE .
- Embodiments 1-4 are the same as those of Embodiments 1-4 in that PUCCH resource collision is avoided by differently allocating PUCCH offsets of A-UE and L-UE. The PUCCH resource collision can be avoided even when the usage change operation of the frame is not detected.
- the AUE may resolve the PUCCH resource stratification by performing time bundling on downlink subframes that are not common in the first timeline and the second timeline. That is, the A-UE always performs A / N time bundling to match the number of downlink subframes of the L-UE, and CCE / ECCE for the downlink subframe overlapping the L-UE among the downlink subframes of the A-UE.
- the index can be used to allocate resources for acknowledgment.
- the PUCCH resource index may be determined based on a downlink subframe of the L-UE.
- Time bundling may be a logical AND operation.
- the AUE and the 5, 6 downlink subframes that need to transmit an acknowledgment response on the timeline of the LUE in the uplink subframe No. 2 Acknowledgments for non-overlapping 4 and 8 downlink subframes may be bundled. That is, bundling is performed on the acknowledgment response of the downlink subframes 4 and 5 and the acknowledgment response of the downlink subframes 6 and 8, and the bundled value of the downlink subframes 4 and 5 is SF 5.
- the bundled values of 6 and 8 downlink subframes may be allocated to the CCE / ECCE index position of SF # 6.
- the UE and the L-UE may be allocated a separate PUCCH region.
- L-UE (or A-UE) may be assigned to PUCCH format 3 and A-UE (or L-UE) may use PUCCH format l / 2 / la / lb / 2a / 2b.
- only the start offset may be differently set in the same PUCCH format.
- the number of downlink subframes interworked in one uplink subframe is interpreted differently between A-UE and L-UE, and DAI of PDCCH / EPDCCH is also assigned to A-UE and L-UE, respectively. Only indicated for link subframes.
- the downlink subframe allocated to the PDCCH uses one of the embodiments 1-1 to 1-6, and applies AR0 to the determination of resources for acknowledgment for the PDSCH allocated by the EPDCCH. Even if different number of downlink subframes are stacked, a collision of PUCCH resources can be avoided to some extent.
- a resource for acknowledgment response for the subframe allocated by the AUE to the flexible subframe is located behind the packing window of the L-UE.
- resources for downlink subframes to be transmitted in an uplink subframe are first allocated according to a first timeline of the LUE, and then resources for a downlink subframe corresponding to only a second timeline of the AUE are allocated. It is.
- the AUE allocates resources for an acknowledgment associated with downlink subframes 4, 5, 8, and 6, downlink 5, 6, 4, and 8 Resources for acknowledgment may be allocated in the order of subframes.
- the PUCCH resource start offsets of the AUE and the LUE may be set identically.
- a subframe allocated by the AUE as a flexible subframe may be positioned in front of the packing window of the LUE during ACK / NACK packing.
- the AUE allocates resources for acknowledgment in the order of subframes 4, 8, 5, and 6, and the LUE can allocate resources for acknowledgment in order of subframes 5, 6.
- the PUCCH resource start offset of the AUE is advanced by the number of CCEs / ECCEs of downlink subframes 4 and 8 times that of the LUE.
- the AUE packs resources for acknowledgment according to the timeline of the LUE, but may empty resources for downlink subframes indicated in the timeline of the LUE but not present in the timeline of the AUE. Thereafter, the resource for acknowledgment of the downlink subframe indicated only in the timeline of the AUE may be located behind the bundling window of the LUE.
- the AUE packs resources for an acknowledgment response in the order of 5, 6, 1 downlink subframes, and 6 downlinks.
- Subframes are treated as null because they do not exist in the AUE timeline.
- the AUE may pack resources for an acknowledgment in the order of ⁇ 5, Null, 1, 0, 4 ⁇ or ⁇ 5, Null, 1, 4, 0 ⁇ in the uplink subframe # 2.
- Null means that resources are empty as many as the number of CCEs / ECCCEs of the sixth downlink subframe. This resource allocation of the acknowledgment response is illustrated in FIG. 16.
- indexes of downlink subframes may be exchanged.
- the exchange is to be as close as possible to the bundling window of the LUE, the number of downlink subframes after the exchange may be four or less.
- the downlink subframe existing only in the timeline of the AUE may be located behind (or before) the bundling window of the LUE.
- the AUE since the AUE transmits an acknowledgment response of the sixth downlink subframe in the uplink subframe three, the uplink three times The 6th downlink subframe (index 7) of which the acknowledgment response should be transmitted in the subframe is exchanged with the 4th downlink subframe (index 8 of the 4th) which needs to transmit the acknowledgment response in the uplink subframe 2.
- the AUE performs packing in the order of the ⁇ 5, 6, 1, 0 ⁇ downlink subframe in the uplink subframe number 2, and the ⁇ 7, 8, 9 ⁇ 4 ⁇ in the uplink subframe number 3 Packing may be performed in order of the downlink subframe.
- the A-UE proposes to set the packing order according to the SF packing order of the L-UE. If the L-UE selects one of the TDD configurations on the SIB to determine the packing order, the A-UE does not select the packing order in order in the reference TDD configuration, but places them according to the packing order selected by the L-UE, The frame can be placed behind.
- the difference between the uplink / downlink switching period of 5 ms and 10 ms is whether the number of special subframes is once or twice within 10 ms.
- the A-UE uses the TDD configuration with a DL reference timing with 10 ms uplink / downlink switching period.
- subframes 5, 6, and 7 are D, S, and U orders.
- subframe packing of the A-UE and the L-UE may have a different order. This is because the L-UE places the special subframe at the end of the packing in the case of D—S-U, but the A-UE determines all the downlink subframes.
- a downlink reference HARQ timeline may be configured for a stable HARQ timeline even in reconstruction of the timeline.
- TDD uplink-downlink configuration 5 may be configured as a downlink reference HARQ timeline.
- the uplink-content link configuration 5 since an acknowledgment is transmitted only in one uplink subframe, a PUCCH resource shortage may occur.
- Downlink reference The HARQ timeline may be delivered to the AUE as higher layer signaling or physical layer signal.
- the downlink reference HARQ timeline and the uplink reference HARQ timeline may be separately indicated. The ambiguity of the HARQ timeline may occur when the terminal receives the reference HARQ timeline and applies the same. For this purpose, the following embodiments may be applied.
- the AUE transmits an acknowledgment acknowledgment using a downlink reference HARQ timeline, but the packing of resources for the acknowledgment may depend on the uplink-downlink configuration actually used. If the UE finds that the reconfiguration message is missed, another PUCCH format (eg, PUCCH format 3, etc.) may be used.
- PUCCH format eg, PUCCH format 3, etc.
- downlink subframes that need to transmit an acknowledgment response in the corresponding uplink subframe, and an acknowledgment by the corresponding uplink subframe when the timeline before the reconfiguration is changed.
- Downlink subframes (or static subframes) that are common among downlink subframes to be packed may be first packed, and resources for the remaining subframes may be packed in descending order. Or, in an ambiguous section, a predetermined uplink-downlink configuration (uplink-downlink configuration
- the set of AR0 values applied to the flexible subframe may be different from the value used in the existing TDD.
- the set of AR0 values applied to the flexible subframe is configured as RRC, so when the configuration change request is received, the set of AR0 values can be selected and used.
- the UE may monitor only static downlink subframes and process the remaining subframes as DTX.
- the UE may perform monitoring only for the static downlink subframe in the radio frame # n + l. In this case, the UE performs the packing only for the static downlink subframe in which the monitoring is performed in the radio frame # n + 2.
- the link subframe may not be packed or may be DTX processed.
- HARQ ACK / NACK transmission is performed.
- the following methods can be used.
- the terminal may determine whether the terminal properly detects the corresponding DCI through the CRC.
- the terminals that do not properly detect the reconfiguration message may perform the following operations.
- the PDSCH may be decoded only for the static downlink subframe and an acknowledgment response may be transmitted.
- the HARQ timeline may follow a timeline on the SIB or may follow a downlink HARQ reference timeline.
- DTX processing will be performed for the corresponding PDSCHs. This may be determined whether the terminal omits the monitoring of the flexible SF or DTX by the DAI setting of the base station.
- the reconfiguration message is not detected, all of the acknowledgments (acknowledgment acknowledgments for the static downlink subframes) related to the corresponding radio frame may not be transmitted.
- the PDSCH is decoded and an acknowledgment response is transmitted only for a subset of the static downlink subframe that is a static downlink subframe and packed before the flexible subframe. It may be.
- the resource for the acknowledgment that needs to be repeatedly transmitted is an uplink in a timeline having the smallest number of uplink subframes among the first and second timelines. It may be included only in the subframe, that is, when HARQ ACK repetition is triggered, the acknowledgment response is repeated only in the static uplink subframe. In this case, the number of repetitions may be counted only when the repetition is performed in the static uplink subframe. In addition, static downlink Only subframes can be bundled and repeated.
- soft buffer partitioning based on the number of downlink HARQ processes of the UE may be performed by the maximum number of downlink HARQ processes linked to the corresponding uplink / downlink HARQ timeline. For example, when the representative uplink / downlink HARQ timeline is defined as uplink-downlink configuration # 3, the soft buffer partition of the UE is set to 9, which is the number of downlink HARQ processes in uplink-downlink configuration # 3. Can be performed.
- the base station may set a DAI field according to the downlink reference TDD configuration. If the PUCCH resource packing according to the current reconfiguration message is performed, the DAI field may follow the TDD configuration of the reconfiguration message.
- the above descriptions may be defined such that the rule is applied only when cross carrier scheduling and / or self-scheduling are applied in a situation where carrier aggregation is applied. Can be.
- the above descriptions may be selectively applied only to terminals operating with elMTA.
- the above descriptions may be selectively applied only to a specific PUCCH format (eg la / lb / 2 / 2a / 2b).
- FIG. 18 is a diagram illustrating the configuration of a transmission point apparatus and a terminal apparatus according to an embodiment of the present invention.
- the transmission point apparatus 10 includes a reception module 11, a transmission module 12, a processor 13, a memory 14, and a plurality of antennas 15. It may include.
- the plurality of antennas 15 means a transmission point device that supports MIM0 transmission and reception.
- the receiving module 11 may receive various signals, data, and information on the uplink from the terminal.
- the transmission module 12 may transmit various signals, data, and information on the downlink to the terminal.
- the processor 13 may control the operation of the overall transmission point apparatus 10.
- the processor 13 of the transmission point apparatus 10 may process matters necessary in the above-described embodiments.
- the processor 13 of the transmission point apparatus 10 performs a function of processing information received by the transmission point apparatus 10, information to be transmitted to the outside, and the memory 14 is processed.
- Information can be stored for a certain time, It may be replaced by a component such as a buffer (not shown).
- the terminal device 20 includes a reception module 21, a transmission module 22, a processor 23, a memory 24, and a plurality of antennas 25. ) May be included.
- the plurality of antennas 25 refers to a terminal device that supports MIM0 transmission and reception.
- the receiving module 21 may receive various signals, data, and information on downlink from the base station.
- the transmission modules 22 may transmit various signals, data, and information on the uplink to the base station.
- the processor 23 may control operations of the entire terminal device 20.
- the processor 23 of the terminal device 20 may process necessary items in the above-described embodiments.
- the processor 23 of the terminal device 20 performs a function of processing the information received by the terminal device 20, information to be transmitted to the outside, and the memory 24, and the like. It may be stored for a predetermined time, and may be replaced by a component such as a buffer (not shown).
- the description of the transmission point apparatus 10 may be similarly applied to the relay apparatus as the downlink transmission entity or the uplink reception entity, and the description of the terminal device 20 is described. The same can be applied to a relay apparatus as a downlink receiving entity or an uplink transmitting entity.
- embodiments of the present invention may be implemented through various means.
- embodiments of the present invention may be implemented by hardware, firmware are software, software, or a combination thereof.
- the method according to the embodiments of the present invention may include one or more ASICs (App 1 i Cat Ion Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices) It can be implemented by PLDs (Programmable Logic Devices), FPGAsCField Programmable Gate Arrays (PLDs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs App 1 i Cat Ion Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- processors controllers, microcontrollers, microprocessors, and the like.
- firmware or software the method according to the embodiments of the present invention may be implemented in the form of modules, procedures, or functions that perform the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit
- Embodiments of the present invention as described above may be applied to various mobile communication systems.
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Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/759,355 US9882697B2 (en) | 2013-01-09 | 2014-01-09 | Method and apparatus for transmitting receipt confirmation reply in wireless communication system |
| EP14737613.1A EP2945310B1 (en) | 2013-01-09 | 2014-01-09 | Method and apparatus for transmitting receipt confirmation reply in wireless communication system |
| CN201480004348.6A CN104995859B (zh) | 2013-01-09 | 2014-01-09 | 在无线通信系统中发送接收确认答复的方法和设备 |
| JP2015552579A JP6006434B2 (ja) | 2013-01-09 | 2014-01-09 | 無線通信システムにおいて受信確認応答送信方法及び装置 |
| KR1020157021483A KR102197967B1 (ko) | 2013-01-09 | 2014-01-09 | 무선 통신 시스템에서 수신확인응답 전송 방법 및 장치 |
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| EP (1) | EP2945310B1 (ko) |
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| KR (1) | KR102197967B1 (ko) |
| CN (1) | CN104995859B (ko) |
| WO (1) | WO2014109571A1 (ko) |
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| JP6629745B2 (ja) * | 2014-02-18 | 2020-01-15 | エルジー エレクトロニクス インコーポレイティド | 無線リソースの用途変更を支援する無線通信システムにおけるチャネル状態情報報告方法及びそのための装置 |
| CN106105084B (zh) * | 2014-03-12 | 2019-07-12 | Lg电子株式会社 | 在支持无线电资源的使用变化的无线通信系统中发送上行链路控制信道的方法及其装置 |
| CN106559887B (zh) * | 2015-09-29 | 2021-12-31 | 华为技术有限公司 | 配置资源的方法及网络设备 |
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| KR20180068677A (ko) * | 2016-12-14 | 2018-06-22 | 삼성전자주식회사 | 무선 통신 시스템에서 하향링크 제어채널의 송수신 방법 및 장치 |
| WO2018166615A1 (en) * | 2017-03-17 | 2018-09-20 | Huawei Technologies Duesseldorf Gmbh | Techniques for latency-aware processing of radio frames |
| CN110637434B (zh) * | 2017-03-24 | 2023-07-25 | 瑞典爱立信有限公司 | 控制无线电通信中上行链路控制信息的定时的方法和装置 |
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| WO2021185229A1 (zh) * | 2020-03-20 | 2021-09-23 | 上海朗帛通信技术有限公司 | 一种被用于无线通信的节点中的方法和装置 |
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- 2014-01-09 KR KR1020157021483A patent/KR102197967B1/ko active Active
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- 2014-01-09 US US14/759,355 patent/US9882697B2/en active Active
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| WO2016165131A1 (zh) * | 2015-04-17 | 2016-10-20 | 华为技术有限公司 | 一种信息反馈的方法、设备和系统 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104995859A (zh) | 2015-10-21 |
| KR20150136468A (ko) | 2015-12-07 |
| EP2945310B1 (en) | 2021-09-01 |
| US20150358137A1 (en) | 2015-12-10 |
| JP2018033153A (ja) | 2018-03-01 |
| JP6408103B2 (ja) | 2018-10-17 |
| EP2945310A1 (en) | 2015-11-18 |
| EP2945310A4 (en) | 2016-10-19 |
| US9882697B2 (en) | 2018-01-30 |
| KR102197967B1 (ko) | 2021-01-04 |
| JP2016510536A (ja) | 2016-04-07 |
| JP6006434B2 (ja) | 2016-10-12 |
| JP2017022749A (ja) | 2017-01-26 |
| JP6224795B2 (ja) | 2017-11-01 |
| CN104995859B (zh) | 2018-11-02 |
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