WO2013066086A1 - 무선통신 시스템에서 ack/nack 수신 방법 및 장치 - Google Patents
무선통신 시스템에서 ack/nack 수신 방법 및 장치 Download PDFInfo
- Publication number
- WO2013066086A1 WO2013066086A1 PCT/KR2012/009142 KR2012009142W WO2013066086A1 WO 2013066086 A1 WO2013066086 A1 WO 2013066086A1 KR 2012009142 W KR2012009142 W KR 2012009142W WO 2013066086 A1 WO2013066086 A1 WO 2013066086A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phich
- pdcch
- nack
- cell
- ack
- Prior art date
Links
Images
Classifications
-
- 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
- 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
- H04L1/1861—Physical mapping arrangements
-
- 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
- H04L1/1864—ARQ related signaling
-
- 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
- H04L1/1867—Arrangements specially adapted for the transmitter end
-
- 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
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
-
- 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
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1896—ARQ related signaling
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for receiving an ACK / NACK indicating an acknowledgment in a wireless communication system.
- MIMO Multiple Input Multiple Output
- CoMP Cooperative Multiple Point Transmission
- relay the most basic and stable solution is to increase the bandwidth.
- CA Carrier aggregation
- Recent communication standards such as 3GPP LTE-A or 802.16m, continue to expand their bandwidths to 20 MHz or more.
- one or more component carriers are aggregated to support broadband. For example, if one component carrier corresponds to a bandwidth of 5 MHz, four carriers are aggregated to support a maximum bandwidth of 20 MHz.
- Such a system supporting carrier aggregation is called a carrier aggregation system.
- the wireless communication system considers a system in which one base station supports more terminals than the existing system. For example, due to the application of technologies such as machine type communication (MTC), enhanced multi-user multi-input multi-output (MIMO), and the like, more terminals may need to be supported by one base station.
- MTC machine type communication
- MIMO enhanced multi-user multi-input multi-output
- E-PDCCH enhanced-PDCCH
- the base station transmits an acknowledgment / not-acknowledgement (ACK / NACK) for uplink data received from the terminal through a physical hybrid-ARQ indicator channel (PHICH).
- PHICH physical hybrid-ARQ indicator channel
- the PHICH is located in an area to which a PDCCH which is an existing control channel is allocated.
- PHICH may also cause radio resources or interference problems when the number of terminals supported by the base station increases and carrier aggregation is supported. Therefore, a channel introduction for new ACK / NACK transmission is considered and such a channel is called an enhanced-PHICH (E-PHICH).
- E-PHICH enhanced-PHICH
- the E-PDCCH and the E-PHICH may not be included in all terminals, all carriers, and all subframes. That is, E-PDCCH and E-PHICH may be selectively used.
- a plurality of carriers may be allocated to a specific terminal.
- the UE needs to specify which channel on which carrier a plurality of carriers will receive ACK / NACK. That is, it may be a problem how the base station transmits the ACK / NACK and how the terminal receives the ACK / NACK.
- a method and apparatus for receiving ACK / NACK in a wireless communication system are provided.
- the method for receiving an acknowledgment / not-acknowledgement (ACK / NACK) of a terminal assigned a plurality of serving cells in a wireless communication system transmits uplink data through a physical uplink shared channel (PUSCH), and the uplink Receives ACK / NACK (acknowledgement / not-acknowledgement) for data through PHICH (Physical Hybrid-ARQ Indicator Channel), the serving cell receiving the ACK / NACK is an uplink grant for the UE scheduling the PUSCH It is characterized in that it is selected from among at least one serving cell to be monitored for detection.
- PUSCH physical uplink shared channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- the method for receiving an acknowledgment / not-acknowledgement (ACK / NACK) of a terminal assigned a plurality of serving cells in a wireless communication system receives PHICH cell indication information indicating a PHICH (Physical Hybrid-ARQ Indicator Channel) cell Transmitting uplink data through a physical uplink shared channel (PUSCH), and receiving ACK / NACK (acknowledgement / not-acknowledgement) for the uplink data through a Physical Hybrid-ARQ Indicator Channel (PHICH), The ACK / NACK is received through a serving cell indicated by the PHICH cell indication information.
- PHICH Physical Hybrid-ARQ Indicator Channel
- an acknowledgment / not-acknowledgement (ACK / NACK) receiving method of a terminal allocated with a plurality of serving cells in a wireless communication system transmits uplink data through a physical uplink shared channel (PUSCH), and E-PDCCH A subframe that receives an uplink grant through an enhanced-physical downlink control channel, and transmits retransmission or new uplink data for the uplink data based on the uplink grant, and receives the uplink grant.
- the uplink grant is included in place of the Physical Hybrid-ARQ Indicator Channel (PHICH) through which acknowledgment / not-acknowledgement (ACK / NACK) for the uplink data is transmitted.
- PHICH Physical Hybrid-ARQ Indicator Channel
- an acknowledgment / not-acknowledgement (ACK / NACK) receiving method of a terminal assigned a plurality of serving cells in a wireless communication system transmits uplink data through a physical uplink shared channel (PUSCH), and the uplink Receive ACK / NACK (acknowledgement / not-acknowledgement) for the link data through a Physical Hybrid-ARQ Indicator Channel (PHICH), but the serving cell receiving the ACK / NACK receives an uplink grant scheduling the PUSCH.
- the uplink grant is a serving cell and is received through an enhanced-physical downlink control channel (E-PDCCH), and the E-PDCCH is a control channel decoded using a reference signal specific to the terminal.
- E-PDCCH enhanced-physical downlink control channel
- the terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor coupled to the RF unit, wherein the processor transmits uplink data through a physical uplink shared channel (PUSCH), and PHICH ACK / NACK (acknowledgement / not-acknowledgement) for the uplink data.
- PUSCH physical uplink shared channel
- PHICH ACK / NACK acknowledgenowledgement / not-acknowledgement
- the terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor connected to the RF unit, wherein the processor receives PHICH cell indication information indicating a Physical Hybrid-ARQ Indicator Channel (PHICH) cell and transmits uplink data through a physical uplink shared channel (PUSCH) And receiving ACK / NACK (acknowledgement / not-acknowledgement) for the uplink data through a Physical Hybrid-ARQ Indicator Channel (PHICH), wherein the ACK / NACK is a serving cell indicated by the PHICH cell indication information. Characterized in that received through.
- PHICH Physical Hybrid-ARQ Indicator Channel
- the terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor connected to the RF unit, wherein the processor transmits uplink data through a physical uplink shared channel (PUSCH), receives an uplink grant through an enhanced-physical downlink control channel (E-PDCCH), and And retransmission or new uplink data for the uplink data based on the uplink grant, and acknowledgment / not-acknowledgement for the uplink data in a subframe receiving the uplink grant.
- the uplink grant is included instead of the PHICH (Physical Hybrid-ARQ Indicator Channel) transmitted.
- PHICH Physical Hybrid-ARQ Indicator Channel
- the terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor coupled to the RF unit, wherein the processor transmits uplink data through a physical uplink shared channel (PUSCH), and PHICH ACK / NACK (acknowledgement / not-acknowledgement) for the uplink data.
- PUSCH physical uplink shared channel
- PHICH ACK / NACK acknowledgenowledgement / not-acknowledgement
- the terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor coupled to the RF unit, wherein the processor transmits uplink data through a physical uplink shared channel (PUSCH), and PHICH ACK / NACK (acknowledgement / not-acknowledgement) for the uplink data.
- PUSCH physical uplink shared channel
- PHICH ACK / NACK acknowledgenowledgement / not-acknowledgement
- the serving cell receiving the ACK / NACK is a serving cell that receive
- the UE may receive ACK / NACK without ambiguity in a wireless communication system in which an additional control channel E-PDCCH is configured in addition to the existing PDCCH.
- 1 shows a structure of a downlink radio frame in 3GPP LTE-A.
- FIG. 2 shows an example of a resource grid for one downlink slot.
- 3 is a block diagram showing the configuration of a PDCCH.
- FIG. 4 is an exemplary diagram illustrating monitoring of a PDCCH.
- 5 shows a structure of an uplink subframe.
- FIG. 7 is a block diagram showing the configuration of a PHICH in 3GPP LTE.
- FIG. 8 is a comparative example of a conventional single carrier system and a carrier aggregation system.
- FIG. 9 illustrates cross-carrier scheduling in a carrier aggregation system.
- FIG. 10 illustrates an example of scheduling when cross-carrier scheduling is configured in a carrier aggregation system.
- FIG 11 shows an example of setting an E-PHICH region and an E-PDCCH region.
- FIG. 13 shows an ACK / NACK reception method according to the embodiment 2-2.
- FIG. 14 shows an example of a PHICH cell configuration and an ACK / NACK reception method.
- 15 shows an example of a method of receiving ACK / NACK by a terminal.
- 16 illustrates a method of receiving ACK / NACK by a terminal according to embodiment 4-2.
- FIG. 17 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
- LTE Long Term Evolution
- 3GPP 3rd Generation Partnership Project
- E-UMTS Evolved-UMTS
- E-UTRAN Evolved-Universal Terrestrial Radio Access Network
- SCD Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier-Frequency Division Multiple Access
- LTE-A Advanced is the evolution of LTE.
- 3GPP LTE / LTE-A is mainly described, but the technical spirit of the present invention is not limited thereto.
- Wireless devices may be fixed or mobile, and may include user equipment (UE), mobile station (MS), mobile terminal (MT), user terminal (UT), subscriber station (SS), and personal digital assistant (PDA). ), A wireless modem, a handheld device, or other terms.
- the wireless device may be a device that supports only data communication, such as a machine-type communication (MTC) device.
- MTC machine-type communication
- a base station BS generally refers to a fixed station that communicates with a wireless device.
- the base station BS may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point. have.
- eNB evolved-NodeB
- BTS base transceiver system
- access point an access point
- LTE long term evolution
- 3GPP 3rd Generation Partnership Project
- TS Technical Specification
- 3GPP LTE-A 3rd Generation Partnership Project TS Release 10. Describe what happens.
- LTE includes LTE and / or LTE-A.
- the wireless device may be served by a plurality of serving cells.
- Each serving cell may be defined as a downlink (DL) component carrier (CC) or a pair of DL CC and UL (uplink) CC.
- DL downlink
- CC downlink component carrier
- uplink uplink
- the serving cell may be divided into a primary cell (also called a primary cell) and a secondary cell (also called a secondary cell).
- the primary cell is a cell that operates at the primary frequency, performs an initial connection establishment process, initiates a connection reestablishment process, or is designated as a primary cell in a handover process.
- the primary cell is also called a reference cell.
- the secondary cell operates at the secondary frequency, may be established after a Radio Resource Control (RRC) connection is established, and may be used to provide additional radio resources.
- RRC Radio Resource Control
- At least one primary cell is always configured, and the secondary cell may be added / modified / released by higher layer signaling (eg, radio resource control (RRC) message).
- RRC Radio Resource Control
- the cell index (CI) of the primary cell may be fixed.
- the lowest CI may be designated as the CI of the primary cell.
- the CI of the primary cell is 0, and the CI of the secondary cell is sequentially assigned from 1.
- 3GPP LTE-A shows a structure of a downlink radio frame in 3GPP LTE-A. It may be referred to section 6 of 3GPP TS 36.211 V10.2.0 (2011-06) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10)".
- E-UTRA Evolved Universal Terrestrial Radio Access
- R-UTRA Physical Channels and Modulation
- the radio frame includes 10 subframes indexed from 0 to 9.
- One subframe includes two consecutive slots.
- the time it takes for one subframe to be transmitted is called a transmission time interval (TTI).
- TTI transmission time interval
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
- OFDM symbol is only for representing one symbol period in the time domain, since 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink (DL), multiple access scheme or name There is no limit on.
- OFDM symbol may be called another name such as a single carrier-frequency division multiple access (SC-FDMA) symbol, a symbol period, and the like.
- SC-FDMA single carrier-frequency division multiple access
- One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
- CP cyclic prefix
- a resource block is a resource allocation unit and includes a plurality of subcarriers in one slot. For example, if one slot includes 7 OFDM symbols in the time domain and the resource block includes 12 subcarriers in the frequency domain, one resource block includes 7 ⁇ 12 resource elements (REs). It may include.
- FIG. 2 shows an example of a resource grid for one downlink slot.
- the downlink slot includes a plurality of OFDM symbols in the time domain and includes N RB resource blocks (RBs) in the frequency domain.
- the RB includes one slot in the time domain and a plurality of consecutive subcarriers in the frequency domain in resource allocation units.
- the number N RB of resource blocks included in the downlink slot depends on a downlink transmission bandwidth set in a cell. For example, in the LTE system, N RB may be any one of 6 to 110.
- the structure of the uplink slot may also be the same as that of the downlink slot.
- Each element on the resource grid is called a resource element (RE).
- one resource block is composed of 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain to include 7 ⁇ 12 resource elements, but the number of OFDM symbols and the number of subcarriers in the resource block It is not limited to this.
- the number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like.
- the number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
- the DL (downlink) subframe is divided into a control region and a data region in the time domain.
- the control region includes up to four OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
- a physical downlink control channel (PDCCH) and another control channel are allocated to the control region, and a PDSCH is allocated to the data region.
- PDCH physical downlink control channel
- physical control channels in 3GPP LTE / LTE-A include a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid-ARQ indicator channel (PHICH). .
- PDCCH physical downlink control channel
- PCFICH physical control format indicator channel
- PHICH physical hybrid-ARQ indicator channel
- the PCFICH transmitted in the first OFDM symbol of a subframe carries a control format indicator (CFI) regarding the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- CFI control format indicator
- the wireless device first receives the CFI on the PCFICH and then monitors the PDCCH.
- the PCFICH does not use blind decoding and is transmitted on a fixed PCFICH resource of a subframe.
- the PHICH carries a positive-acknowledgement (ACK) / negative-acknowledgement (NACK) signal for an uplink hybrid automatic repeat request (HARQ).
- ACK positive-acknowledgement
- NACK negative-acknowledgement
- HARQ uplink hybrid automatic repeat request
- the ACK / NACK signal for uplink (UL) data on the PUSCH transmitted by the wireless device is transmitted on the PHICH.
- the Physical Broadcast Channel (PBCH) is transmitted in the preceding four OFDM symbols of the second slot of the first subframe of the radio frame.
- the PBCH carries system information necessary for the wireless device to communicate with the base station, and the system information transmitted through the PBCH is called a master information block (MIB).
- MIB master information block
- SIB system information block
- DCI downlink control information
- PDSCH also called DL grant
- PUSCH resource allocation also called UL grant
- VoIP Voice over Internet Protocol
- transmission of a DL transport block is performed by a pair of PDCCH and PDSCH.
- Transmission of the UL transport block is performed by a pair of PDCCH and PUSCH.
- the wireless device receives a DL transport block on a PDSCH indicated by the PDCCH.
- the wireless device monitors the PDCCH in the DL subframe and receives the DL resource allocation on the PDCCH.
- the wireless device receives the DL transport block on the PDSCH indicated by the DL resource allocation.
- 3 is a block diagram showing the configuration of a PDCCH.
- blind decoding is used to detect the PDCCH.
- Blind decoding is a method of demasking a desired identifier in a CRC of a received PDCCH (which is called a candidate PDCCH) and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
- the base station determines the PDCCH format according to the DCI to be sent to the wireless device, and then attaches a cyclic redundancy check (CRC) to the DCI. ) To the CRC (block 210).
- CRC cyclic redundancy check
- a unique identifier of the wireless device for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
- a paging indication identifier for example, P-RNTI (P-RNTI)
- P-RNTI P-RNTI
- SI-RNTI system information-RNTI
- RA-RNTI random access-RNTI
- TPC-RNTI transmit power control
- the PDCCH carries control information for a specific wireless device (called UE-specific control information). If another RNTI is used, the PDCCH is received by all or a plurality of wireless devices in a cell. Carries common control information.
- the DCI to which the CRC is added is encoded to generate coded data (block 220).
- Encoding includes channel encoding and rate matching.
- the coded data is modulated to generate modulation symbols (block 230).
- the modulation symbols are mapped to physical resource elements (block 240). Each modulation symbol is mapped to an RE.
- the control region in the subframe includes a plurality of control channel elements (CCEs).
- the CCE is a logical allocation unit used to provide a coding rate according to the state of a radio channel to a PDCCH and corresponds to a plurality of resource element groups (REGs).
- the REG includes a plurality of resource elements.
- the format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- One REG includes four REs and one CCE includes nine REGs.
- ⁇ 1, 2, 4, 8 ⁇ CCEs may be used to configure one PDCCH, and each element of ⁇ 1, 2, 4, 8 ⁇ is called a CCE aggregation level.
- the number of CCEs used for transmission of the PDDCH is determined by the base station according to the channel state. For example, for a wireless device having a good downlink channel state, one CCE may be used for PDCCH transmission. Eight CCEs may be used for PDCCH transmission for a wireless device having a poor downlink channel state.
- a control channel composed of one or more CCEs performs interleaving in units of REGs and is mapped to physical resources after a cyclic shift based on a cell ID.
- FIG. 4 is an exemplary diagram illustrating monitoring of a PDCCH. This may be referred to in section 9 of 3GPP TS 36.213 V10.2.0 (2011-06).
- blind decoding is used to detect the PDCCH.
- Blind decoding is a method of demasking a desired identifier in a CRC of a received PDCCH (which is called a PDCCH candidate), and checking a CRC error to determine whether the corresponding PDCCH is its control channel.
- the wireless device does not know where its PDCCH is transmitted using which CCE aggregation level or DCI format at which position in the control region.
- a plurality of PDCCHs may be transmitted in one subframe.
- the wireless device monitors the plurality of PDCCHs every subframe.
- monitoring means that the wireless device attempts to decode the PDCCH according to the monitored PDCCH format.
- a search space is used to reduce the burden of blind decoding.
- the search space may be referred to as a monitoring set of the CCE for the PDCCH.
- the wireless device monitors the PDCCH in the corresponding search space.
- the search space is divided into a common search space and a UE-specific search space.
- the common search space is a space for searching for a PDCCH having common control information.
- the common search space includes 16 CCEs up to CCE indexes 0 to 15 and supports a PDCCH having a CCE aggregation level of ⁇ 4, 8 ⁇ .
- PDCCHs (DCI formats 0 and 1A) carrying UE specific information may also be transmitted in the common search space.
- the UE-specific search space supports a PDCCH having a CCE aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
- Table 1 below shows the number of PDCCH candidates monitored by the wireless device.
- the size of the search space is determined by Table 1, and the starting point of the search space is defined differently from the common search space and the terminal specific search space.
- the starting point of the common search space is fixed irrespective of the subframe, but the starting point of the UE-specific search space is for each subframe according to the terminal identifier (eg, C-RNTI), the CCE aggregation level and / or the slot number in the radio frame. Can vary.
- the terminal specific search space and the common search space may overlap.
- the search space S (L) k is defined as a set of PDCCH candidates at a set level L ⁇ ⁇ 1,2,3,4 ⁇ .
- the CCE corresponding to the PDCCH candidate m in the search space S (L) k is given as follows.
- N CCE, k can be used to transmit the PDCCH in the control region of subframe k.
- the control region includes a set of CCEs numbered from 0 to N CCE, k ⁇ 1.
- M (L) is the number of PDCCH candidates at CCE aggregation level L in a given search space.
- variable Y k is defined as follows.
- n s is a slot number in a radio frame.
- a DCI format and a search space to be monitored are determined according to a transmission mode of the PDSCH.
- the following table shows an example of PDCCH monitoring configured with C-RNTI.
- the uses of the DCI format are classified as shown in the following table.
- 5 shows a structure of an uplink subframe.
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
- the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
- the UE may simultaneously transmit the PUCCH and the PUSCH, or may transmit only one of the PUCCH and the 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 in each of a first slot and a second slot.
- the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- HARQ Hybrid Automatic Repeat reQuest
- ACK Non-acknowledgement
- NACK Non-acknowledgement
- channel status information indicating the downlink channel status, for example, Channel Quality Indicator (CQI), precoding matrix on the PUCCH
- CQI Channel Quality Indicator
- An index PTI
- a precoding type indicator PTI
- RI rank indication
- the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
- the transport block may include user data.
- the uplink data may be multiplexed data.
- the multiplexed data may be multiplexed of a transport block and channel state information for an uplink shared channel (UL-SCH).
- channel state information multiplexed with data may include CQI, PMI, RI, and the like.
- the uplink data may consist of channel state information only. Periodic or aperiodic channel state information may be transmitted through the PUSCH.
- 3GPP LTE uses synchronous HARQ in uplink transmission and asynchronous HARQ in downlink transmission.
- Synchronous HARQ means that retransmission timing is fixed, and asynchronous HARQ does not have fixed retransmission timing. That is, in the synchronous HARQ, initial transmission and retransmission are performed in an HARQ period.
- the wireless device receives an initial UL grant on the PDCCH 310 in the nth subframe from the base station.
- the wireless device transmits a UL transport block on the PUSCH 320 using the initial UL grant in the n + 4th subframe.
- the base station sends an ACK / NACK signal for the UL transport block on the PHICH 331 in the n + 8th subframe.
- An ACK / NACK signal indicates an acknowledgment for the UL transport block
- an ACK signal indicates a reception success
- a NACK signal indicates a reception failure.
- the base station may send a retransmission UL grant on the PDCCH 332 or may not send a separate UL grant. Alternatively, retransmission of old data may be stopped and a UL grant for transmission of new data may be sent. If the ACK signal, the base station may send a UL grant for a new transmission on the PDCCH.
- the base station may also send a UL grant (retransmission UL grant) for retransmission.
- a UL grant retransmission UL grant
- the wireless device ignores the ACK / NACK signal and follows the indication of the retransmitted UL grant. This is because there is no CRC in the ACK / NACK signal and there is a CRC in the UL grant, so the reliability of the UL grant is higher.
- the wireless device which does not receive the UL grant and receives the NACK signal sends a retransmission block on the PUSCH 340 in the n + 12th subframe.
- the wireless device uses the received retransmission UL grant upon receiving the retransmission UL grant on the PDCCH 332, and uses the previously received UL grant for the same HARQ process if the retransmission UL grant is not received. .
- the base station sends an ACK / NACK signal for the UL transport block on the PHICH 351 in the n + 16th subframe.
- the base station may send a retransmission UL grant on the PDCCH 352 or may not send a separate UL grant.
- synchronous HARQ is performed using 8 subframes as the HARQ period.
- each HARQ process can be performed in the 3GPP LTE FDD system, and each HARQ process is indexed from 0 to 7.
- FIG. 7 is a block diagram showing the configuration of a PHICH in 3GPP LTE.
- One PHICH transmits only one bit ACK / NACK for a PUSCH, that is, a single stream of one wireless device.
- step S310 1 bit ACK / NACK is coded into 3 bits using a repetition code having a code rate of 1/3.
- step S320 the coded ACK / NACK is modulated by a Binary Phase Key-Shifting (BPSK) scheme to generate three modulation symbols.
- BPSK Binary Phase Key-Shifting
- step S330 the modulation symbols are spread using an orthogonal sequence.
- N PHICH SF 4
- N PHICH SF 2.
- the number of orthogonal sequences used is N PHICH SF * 2 to apply I / Q multiplexing.
- N PHICH SF * The PHICHs spread using two orthogonal sequences may be defined as one PHICH group.
- the following table shows an orthogonal sequence for PHICH.
- step S340 layer mapping is performed on the spread symbols.
- step S350 the layer mapped symbols are resource mapped and transmitted.
- a plurality of PHICHs mapped to resource elements of the same set form a PHICH group, and each PHICH in the PHICH group is distinguished by different orthogonal sequences.
- FDD Frequency Division Duplex
- N group PHICH of PHICH groups is constant in all subframes, and is given by the following equation.
- Ng is a parameter transmitted on a physical broadcast channel (PBCH) and Ng ' ⁇ 1 / 6,1 / 2,1,2 ⁇ .
- N DL RB represents the number of downlink RBs.
- ceil (x) is a function that outputs the minimum value among integers greater than or equal to x.
- floor (x) is a function that outputs the maximum value among integers less than or equal to x.
- the wireless device identifies the PHICH resource used by the PHICH by an index pair (n group PHICH , n seq PHICH ).
- PHICH group index n group PHICH has a value between 0 and N group PHICH -1.
- Orthogonal sequence index n seq PHICH indicates the index of the orthogonal sequence.
- n DMRS refers to a cyclic shift of a demodulation refernence signal (DMRS) in a most recent UL grant for a transport block associated with a corresponding PUSCH transmission.
- DMRS is an RS used for PUSCH transmission.
- N PHICH SF is the SF size of an orthogonal sequence used for PHICH modulation.
- I lowest_index PRB_RA is the smallest PRB index in the first slot of the corresponding PUSCH transmission.
- I PHICH is a value of zero or one.
- PRB Physical Resource Block
- SPS Semi-persistent scheduling
- a terminal receives scheduling information such as a DL grant, a UL grant, etc. through a PDCCH, and the terminal receives a PDSCH and transmits a PUSCH based on the scheduling information.
- the DL grant and the PDSCH are received in the same subframe.
- the PUSCH is transmitted after 4 subframes from the subframe in which the UL grant is received.
- LTE also provides semi-persistent scheduling (SPS).
- the downlink or uplink SPS may inform the UE in which subframes a semi-static transmission (PUSCH) / reception (PDSCH) is performed through an upper layer signal such as radio resource control (RRC).
- RRC radio resource control
- the parameter given as the higher layer signal may be, for example, a period and an offset value of the subframe.
- the terminal After recognizing semi-static transmission / reception through RRC signaling, the terminal performs or releases SPS transmission / reception when receiving an activation and release signal of SPS transmission through PDCCH. That is, even if the terminal receives the SPS through RRC signaling, instead of performing the SPS transmission / reception immediately, but receiving the activation or release signal through the PDCCH, the frequency resource (resource block) according to the resource block allocation specified in the PDCCH, MCS SPS transmission / reception is performed in a subframe corresponding to a subframe period and an offset value allocated through RRC signaling by applying a modulation and a coding rate according to the information. If the release signal is received through the PDCCH, the SPS transmission / reception is stopped. When the suspended SPS transmission / reception receives a PDCCH including an activation signal again, the SPS transmission / reception resumes using a frequency resource designated by the corresponding PDCCH, an MCS, and the like.
- FIG. 8 is a comparative example of a conventional single carrier system and a carrier aggregation system.
- CC component carrier
- the carrier aggregation system may be divided into a continuous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which carriers aggregated are separated from each other.
- a carrier aggregation system simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
- the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
- the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
- broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
- the system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
- the carrier frequency means a center frequency of a cell.
- a cell may mean a downlink frequency resource and an uplink frequency resource.
- the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
- CA carrier aggregation
- the terminal In order to transmit and receive packet data through a specific cell, the terminal must first complete configuration for the specific cell.
- the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
- the configuration may include a general process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer.
- MAC media access control
- the cell in the configuration complete state may exist in an activation or deactivation state.
- activation means that data is transmitted or received or is in a ready state.
- the UE may monitor or receive a control channel (PDCCH) and a data channel (PDSCH) of an activated cell in order to identify resources (which may be frequency, time, etc.) allocated thereto.
- PDCCH control channel
- PDSCH data channel
- Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
- the terminal may receive system information (SI) required for packet reception from the deactivated cell.
- SI system information
- the terminal does not monitor or receive the control channel (PDCCH) and data channel (PDSCH) of the deactivated cell in order to check the resources (may be frequency, time, etc.) allocated to them.
- PDCH control channel
- PDSCH data channel
- the cell may be divided into a primary cell, a secondary cell, and a serving cell.
- the primary cell refers to a cell operating at a primary frequency, and is a cell in which the terminal performs an initial connection establishment procedure or connection reestablishment with the base station, or is indicated as a primary cell in a handover process. It means a cell.
- the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
- the serving cell is configured as a primary cell when the carrier aggregation is not set or the terminal cannot provide carrier aggregation.
- the term serving cell indicates a cell configured for the terminal and may be configured in plural.
- One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
- the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
- a primary component carrier refers to a component carrier (CC) corresponding to a primary cell.
- the PCC is a CC in which the terminal initially makes a connection (connection or RRC connection) with the base station among several CCs.
- the PCC is a special CC that manages a connection (Connection or RRC Connection) for signaling regarding a plurality of CCs and manages UE context, which is connection information related to a terminal.
- the PCC is connected to the terminal and always exists in the active state in the RRC connected mode.
- the downlink component carrier corresponding to the primary cell is called a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary cell is called an uplink major component carrier (UL PCC).
- DL PCC downlink primary component carrier
- U PCC uplink major component carrier
- Secondary component carrier refers to a CC corresponding to the secondary cell. That is, the SCC is a CC allocated to the terminal other than the PCC, and the SCC is an extended carrier for the additional resource allocation other than the PCC and may be divided into an activated or deactivated state.
- the downlink component carrier corresponding to the secondary cell is referred to as a DL secondary CC (DL SCC), and the uplink component carrier corresponding to the secondary cell is referred to as an uplink secondary component carrier (UL SCC).
- DL SCC DL secondary CC
- UL SCC uplink secondary component carrier
- the primary cell and the secondary cell have the following characteristics.
- the primary cell is used for transmission of the PUCCH.
- the primary cell is always activated, while the secondary cell is a carrier that is activated / deactivated according to specific conditions.
- RLF Radio Link Failure
- the primary cell may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure.
- NAS non-access stratum
- the primary cell is always configured with a pair of DL PCC and UL PCC.
- a different CC may be configured as a primary cell for each UE.
- the primary cell can be replaced only through a handover, cell selection / cell reselection process.
- RRC signaling may be used to transmit system information of a dedicated secondary cell.
- the downlink component carrier may configure one serving cell, and the downlink component carrier and the uplink component carrier may be connected to configure one serving cell.
- the serving cell is not configured with only one uplink component carrier.
- the activation / deactivation of the component carrier is equivalent to the concept of activation / deactivation of the serving cell.
- activation of serving cell 1 means activation of DL CC1.
- serving cell 2 assumes that DL CC2 and UL CC2 are connected and configured, activation of serving cell 2 means activation of DL CC2 and UL CC2.
- each component carrier may correspond to a serving cell.
- the number of component carriers aggregated between the downlink and the uplink may be set differently.
- the case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
- the size (ie bandwidth) of the CCs may be different. For example, assuming that 5 CCs are used for a 70 MHz band configuration, 5 MHz CC (carrier # 0) + 20 MHz CC (carrier # 1) + 20 MHz CC (carrier # 2) + 20 MHz CC (carrier # 3) It may be configured as + 5MHz CC (carrier # 4).
- a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.
- Such a carrier aggregation system may support cross-carrier scheduling.
- Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
- a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
- a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
- a field including such a carrier indicator is hereinafter called a carrier indication field (CIF).
- a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
- CIF carrier indication field
- DCI downlink control information
- 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
- FIG. 9 illustrates cross-carrier scheduling in a carrier aggregation system.
- the base station may set a PDCCH monitoring DL CC (monitoring CC) set.
- the PDCCH monitoring DL CC set includes some DL CCs among the aggregated DL CCs, and when cross-carrier scheduling is configured, the UE performs PDCCH monitoring / decoding only for DL CCs included in the PDCCH monitoring DL CC set. In other words, the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set.
- the PDCCH monitoring DL CC set may be configured UE-specifically, UE group-specifically, or cell-specifically.
- three DL CCs (DL CC A, DL CC B, and DL CC C) are aggregated, and DL CC A is set to PDCCH monitoring DL CC.
- the UE may receive the DL grant for the PDSCH of the DL CC A, the DL CC B, and the DL CC C through the PDCCH of the DL CC A.
- the DCI transmitted through the PDCCH of the DL CC A may include the CIF to indicate which DCI the DLI is.
- FIG. 10 illustrates an example of scheduling when cross-carrier scheduling is configured in a carrier aggregation system.
- DL CC 0, DL CC 2, and DL CC 4 are PDCCH monitoring DL CC sets.
- the UE searches for DL grant / UL grant for DL CC 0 and UL CC 0 (UL CC linked to DL CC 0 and SIB 2) in the CSS of DL CC 0.
- the DL grant / UL grant for the DL CC 1 and the UL CC 1 is searched for in SS 1 of the DL CC 0.
- SS 1 is an example of USS. That is, SS 1 of DL CC 0 is a search space for searching for a DL grant / UL grant that performs cross-carrier scheduling.
- MTC machine type communication
- MU-MIMO enhanced multi-user multi-input multi-output
- more terminals may be connected to one base station than the existing system. Can be.
- it may be difficult to transmit control information to a plurality of terminals using only a control region, that is, a PDCCH region in a conventional downlink subframe. That is, the control area may be insufficient.
- a plurality of RRHs or the like may be disposed in the cell, thereby causing interference in the control region.
- E-PDCCH enhanced-PDCCH
- the existing PDCCH and E-PDCCH have the following differences.
- the existing PDCCH is located in a control region in a subframe, that is, a region composed of first N (N is a natural number of 1 to 4) OFDM symbols, but the E-PDCCH is a data region in the subframe, that is, the It may be located in an area composed of remaining OFDM symbols except for N OFDM symbols.
- E-PDCCH can be demodulated based on DM-RS specific to a specific UE as well as CRS. Do. Accordingly, the E-PDCCH may apply beamforming through precoding similarly to the PDSCH, and as a result, the reception SINR may increase.
- the existing PDCCH may be applied to a terminal operating in LTE, and the E-PDCCH may be selectively applied to a terminal supporting LTE-A.
- the terminal supporting LTE-A can also support the existing PDCCH.
- the E-PDCCH there may be a distributed E-PDCCH composed of distributed resources and a local E-PDCCH composed of localized resources.
- the distributed E-PDCCH may obtain diversity gain and may be used to transmit control information to multiple terminals, and the local E-PDCCH may be used to transmit control information to a specific terminal with a frequency selective characteristic. have.
- the PHICH may also cause a problem of deterioration in reception performance due to resource shortage and interference.
- LTE-A is considering introducing a new PHICH in addition to the existing PHICH.
- the new PHICH is called E-PHICH (enhanced-PHICH) for convenience.
- PHICH and E-PHICH are channels through which the base station transmits ACK / NACK for the UL data channel transmitted by the terminal.
- the E-PHICH may be set in the PDSCH region.
- the E-PHICH may be set in the E-PDCCH region set in the PDSCH region.
- FIG 11 shows an example of setting an E-PHICH region and an E-PDCCH region.
- an E-PDCCH region may be set in a PDSCH region.
- the E-PDCCH region is an enhanced-common search space (E-CSS) where only a specific terminal group or all terminals in a cell search for their E-PDCCH and only a specific terminal is owned. It may include an enhanced UE-specific search space (E-USS) for searching the E-PDCCH. Or it may include only one of E-CSS, E-USS.
- E-CSS enhanced-common search space
- E-USS enhanced UE-specific search space
- the E-PHICH may be set in the E-PDCCH region.
- the E-PHICH may be set in the E-CSS.
- ACK / NACK for multiple terminals may be multiplexed and transmitted through the E-PHICH.
- the OFDM symbol start position of the E-PHICH should be determined in consideration of the case of all OFDM symbols in which the PDCCH can be located. .
- a start OFDM symbol position of an E-PHICH is 1) an E-PDCCH of the same cell and the same subframe, or 2) a sub-channel in which an UL grant for scheduling a PUSCH targeted for ACK / NACK transmitted in the E-PHICH is transmitted. It may be set equal to the start position of the E-PDCCH of the frame. This is because the characteristics of the E-PDCCH and the E-PHICH are transmitted in addition to the existing PDCCH region are similar and to reduce the separate signaling or procedure for starting the E-PHICH.
- the starting position of the E-PHICH may be set to the E-PDCCH including CSS. It can be set equal to the start position.
- the start position of the E-PHICH may be set to be the same as the distributed E-PDCCH.
- the OFDM symbol next to the maximum OFDM symbol in which the PDCCH can be located may be the start position of the E-PHICH.
- the start position of the E-PHICH can be the fourth OFDM symbol.
- the start position of the E-PHICH may be set by the RRC message.
- the E-PHICH may be transmitted on a search space for an E-PDCCH for scheduling a PUSCH or assigned to a specific location of the search space (eg, a fixed location or a signal signaled by an RRC message). have.
- the E-PHICH may be located in the search space of the UL grant.
- the ACK / NACK response of the base station for the PUSCH may be used in place of the UL grant because the base station may cause retransmission of the PUSCH without the UL grant.
- a search space of a DL grant and a search space of a UL grant may be time division multiplexed (TDM).
- TDM time division multiplexed
- the search space of the DL grant may be located in the first slot
- the search space of the UL grant may be located in the second slot.
- the E-PHICH is also preferably located in the second slot.
- TDM in order of search space of DL grant and search space of UL grant is that HARQ process by UL grant occurs after a certain number of subframes, whereas PDSCH decoding by DL grant occurs in the same subframe. This is because the HARQ process can afford time. Therefore, it is desirable that the E-PHICH also maintain the same HARQ timing as the UL grant.
- the E-PHICH may be configured as a channel independent of the E-PDCCH such as the relationship of the PDCCH-PHICH.
- the E-PHICH may be transmitted in the DCI format of the E-PDCCH without configuring the independent channel. That is, the ACK / NACK for the PUSCH can be included in the DCI format of the E-PDCCH without being transmitted through an E-PHICH, which is a separate control channel, or a new DCI format can be defined and transmitted.
- the DCI format (or the new DCI format) may include information obtained by multiplexing ACK / NACK for a plurality of terminals, and the base station may refer to an E-PHICH identifier (e.g., E-PHICH RNTI) assigned to a specific terminal group. It can be transmitted by scrambling the CRC of the DCI format.
- each terminal may receive ACK / NACK information through a bit field of a signaled position.
- scheduling information such as resource allocation information (including frequency hopping), NDI (new data indicator), MCS (modulation and coding scheme), and DMRS (TPC) May be included).
- resource allocation information including frequency hopping
- NDI new data indicator
- MCS modulation and coding scheme
- TPC DMRS
- PHICH Even if the wireless communication system supports both PHICH and E-PHICH, only one of PHICH, E-PHICH or both may be set for each cell or subframe.
- the PHICH and the E-PHICH can be configured in the subframe, it is inefficient for the UE to monitor both the PHICH and the E-PHICH and receive the ACK / NACK for the PUSCH, which can increase power consumption of the UE.
- the UE monitors the PDCCH cell, the PDCCH cell, the E-PDCCH cell, the E-PDCCH cell, the PHICH cell is transmitted, the PHICH cell, and the E-PHICH cell is transmitted, the E-PHICH cell. This is called.
- the PDCCH cell may be a cell in which a search space is set in the PDCCH region
- the E-PDCCH cell may be a cell in which a search space is set in the E-PDCCH region.
- the PDCCH cell and the E-PDCCH cell may be mutually exclusive or overlap.
- the PHICH cell and the E-PHICH cell may also be mutually exclusive or overlap. That is, the UE may be configured to monitor the PHICH in some subframes in one cell and the E-PHICH in the other subframes. That is, the operation described below may vary for each subframe.
- First embodiment UL grant is present in the PDCCH.
- the corresponding PDCCH cell becomes a PHICH cell. That is, the PHICH is also transmitted in the cell in which the PDCCH is transmitted.
- PHICH cell may be designated as RRC. That is, the base station may configure a cell in which the PHICH is transmitted through the RRC message to the terminal, and the PHICH cell and the PDCCH cell may be configured independently. This may be desirable for uniformity with a method of designating a designation of a PHICH transmission cell for an E-PDCCH cell, which will be described later, as RRC.
- Second Embodiment UL Grant is Present in E-PDCCH.
- Embodiment 2-1 When a plurality of cells are configured in a terminal, a PDCCH cell among the plurality of cells may be a PHICH cell. When there are a plurality of PDCCH cells, the PHICH cell may be a primary cell.
- the UE Since the PDCCH cell has a relatively good channel state selected, the UE selects the PHICH cell among the PDCCH cells so that the UE can stably receive the PHICH. In particular, since the primary cell performs system information reception and decoding of the PDCCH region during initial access, a cell that has been verified for PDCCH reception is selected.
- a PHICH cell may be a cell in which an UL grant is transmitted through an E-PDCCH. That is, the base station may transmit the PHICH through the cell transmitting the UL grant on the E-PDCCH. This will be described with reference to FIG. 13. The method of FIG. 13 is to transmit ACK / NACK through the PHICH if the interference of the PDCCH region in which the PHICH is transmitted is not severe in the cell transmitting the E-PDCCH. PHICHs in neighboring cells may be shifted in the frequency axis based on the cell ID.
- FIG. 13 shows an ACK / NACK reception method according to the embodiment 2-2.
- DL CCs 0 and 1 and UL CCs 0 and 1 may be configured for the UE.
- DL CC 0 and UL CC 0 constitute a first serving cell
- DL CC 1 and UL CC 1 constitute a second serving cell.
- DL CC 0, 1, and UL CC 0, 1 are merely indexing each CC for the convenience of description (also in the following drawings).
- the UE may receive UL grants for UL CC 0 and 1 through the E-PDCCH of DL CC 0.
- the terminal transmits the PUSCH on the UL CC 0, 1 according to the UL grants.
- ACK / NACK for this PUSCH is received through the PHICH of DL CC 0.
- the UL grants and the PHICH are not simultaneously transmitted in the same subframe, but are only indicated in the same subframe for convenience of description.
- Embodiment 2-3 PHICH cell for PUSCH may be previously designated as RRC. This will be described with reference to FIG. 14.
- FIG. 14 shows an example of a PHICH cell configuration and an ACK / NACK reception method.
- the base station transmits an RRC message including PHICH cell indication information indicating a PHICH cell to the terminal (S110).
- the RRC message may be an 'RRCConnectionReconfiguration message'. Assume that the PHICH cell indicated by the PHICH cell indication information is a first cell.
- the base station transmits a UL grant through the second cell (S120).
- the UL grant may be transmitted on the PDCCH or may be transmitted on the E-PDCCH.
- the terminal transmits the PUSCH based on the UL grant (S130).
- the base station transmits ACK / NACK for the PUSCH through the first cell (S140). Since the UE may know the PHICH cell (first cell) through the PHICH cell indication information included in the RRC message, the UE may receive an ACK / NACK for the PUSCH through the first cell.
- the method described with reference to FIG. 14 has a difference in explicitly indicating a PHICH cell compared to the method of FIG. 13.
- the PHICH cell is not necessarily set to be the same as the E-PDCCH cell to which the UL grant is transmitted.
- Such RRC configuration may be indicated for each cell.
- it may be configured differently for each subframe in one cell.
- Embodiment 2-4 Unlike the methods for transmitting ACK / NACK through the PHICH, the PHICH for the PUSCH may not be transmitted. In this case, retransmission by HARQ may be performed only by the UL grant.
- the conventional UE receives the NACK through the PHICH, if there is no UL grant, the conventional UE retransmits the PUSCH through the resource by the previous UL grant.
- HARQ retransmission by NACK is not allowed, and HARQ retransmission can be performed only by UL grant.
- the UE may determine whether to transmit a new PUSCH or retransmit the PUSCH based on a new data indicator (NDI) included in the UL grant. That is, when the NDI of the UL grant indicates a new PUSCH transmission, it may be assumed that the UE has received an ACK for the previously transmitted PUSCH.
- the base station may set in advance through the RRC message whether to operate without the PHICH or transmit the PHICH.
- Example 2-2 may be applied to a legacy carrier type (LCT).
- the CRS may not be set and thus may be more suitable for an NCT (New Carrier Type) that does not constitute a PHICH.
- NCT New Carrier Type
- the method of Example 2-2 cannot be used, and methods such as Examples 2-1, 2-3, and 2-4 are not available. need.
- the PHICH when the corresponding cell is not the primary cell, the PHICH may be configured using the cell ID, the reference signal antenna port number, the Ng, and the PHICH duration signaled by the RRC. .
- Embodiment 2-2 may be configured when the E-PDCCH cell to which the UL grant is transmitted is a PDCCH cell. That is, it corresponds to a cell that monitors the PDCCH in some subframes and monitors the E-PDCCH in other subframes. This is because in such cells, the interference of the PDCCH is not so severe that the E-PDCCH may be used to compensate for the lack of capacity of the PDCCH.
- a PHICH may be used for the UL HARQ process scheduled with the PDCCH and a method without a PHICH may be used for the UL HARQ process scheduled with the E-PDCCH, that is, the embodiments 2-4.
- the subframe to receive the retransmission UL grant is a subframe in which the monitoring of the USS of the PDCCH is set, use Example 2-2, and the subframe in which the monitoring of the USS of the E-PDCCH is set and there is no E-PHICH in the corresponding subframe. In this case, Examples 2-1, 2-3, or 2-4 may be applied.
- the subframe to receive the ACK / NACK response for the PUSCH is a subframe in which the monitoring of the USS of the PDCCH is set
- Embodiment 2-2 use Embodiment 2-2, and the subframe in which the monitoring of the USS of the E-PDCCH is set and corresponds to the corresponding subframe.
- Examples 2-1, 2-3, or 2-4 may be applied. This takes into account the case where the UL grant timing and the PHICH timing are different when PUSCH subframe bundling is applied or when different TDD UL-DL configurations are used.
- the terminal is set to monitor the E-PHICH.
- the base station can inform the terminal which channel of the PHICH and E-PHICH is transmitted ACK / NACK.
- the selective use of PHICH and E-PHICH depends on their respective characteristics. Since the PHICH is located in the PDCCH region, it may be difficult to avoid performance degradation when the interference by the PDCCH region of the neighboring cell is severe. The configuration of the E-PHICH consumes additional PDSCH resources, but since the E-PHICH can be configured in the PDSCH region, the inter-cell PDSCH scheduling is coordinated to avoid interference between cells.
- Embodiment 3-1 The base station may inform, via an RRC message, which channel among PHICH and E-PHICH is transmitted through the RRC message for each subframe.
- the PHICH monitoring setting and the E-PHICH monitoring setting may be performed in the same subframe as the PDCCH monitoring setting and the E-PDCCH monitoring setting, respectively.
- Embodiment 3-2 Alternatively, the selection of the PHICH and the E-PHICH may be determined according to the DCI format used as the UL grant. For example, a PHICH may be used for a PUSCH scheduled in DCI format 0, and an E-PHICH may be used for a PUSCH scheduled in DCI format 4. The UE may know which channel of PHICH and E-PHICH should be ACK / NACK implicitly based on the DCI format included in the UL grant.
- Embodiment 3-3 Selection of PHICH and E-PHICH may be indicated by using a bit field combination of an UL grant. For example, a specific state of the DMRS field may be indicated to indicate the use of E-PHICH.
- Embodiment 3-4 When the UL grant for the corresponding HARQ process is transmitted, the E-PHICH may not be transmitted. Therefore, when the UL grant is detected, even if there is a resource allocated to the E-PHICH, the terminal may ignore it and use it as a PDSCH.
- Embodiment 4-1 When a UL grant is present in a PDCCH, a PDCCH cell (or subframe) becomes a PHICH cell (or subframe), and when an UL grant is present in an E-PDCCH, an E-PDCCH cell (or subframe) Frame) may be an E-PHICH cell (or subframe). It demonstrates with reference to FIG.
- 15 shows an example of a method of receiving ACK / NACK by a terminal.
- DL CCs 0 and 1 and UL CCs 0 and 1 may be configured for the UE.
- the UE may receive an UL grant for UL CC 0 through the PDCCH of DL CC 0.
- the UL grant for the UL CC 1 may be received through the E-PDCCH of the DL CC 1.
- the UE implicitly receives the ACK / NACK for the PUSCH transmitted through the UL CC 1 scheduled through the PDCCH through the PHICH and transmits through the UL CC 1 scheduled through the E-PDCCH. It can be seen that ACK / NACK for one PUSCH should be received through the E-PHICH.
- UL grants, PHICHs, and E-PHICHs are not transmitted simultaneously in the same subframe, but are only indicated within the same subframe for convenience of description.
- Embodiment 4-2 The base station may set the designation of the PHICH monitoring cell and the E-PHICH monitoring cell to the UE as an RRC message for each cell in which the PUSCH is transmitted. That is, the base station may inform, via an RRC message, which channel of PHICH and E-PHICH is transmitted for each cell in which the PUSCH is transmitted through the RRC message. Alternatively, through an RRC message, which channel of PHICH and E-PHICH is transmitted in each cell in one cell may be transmitted through an RRC message. That is, the terminal monitors the corresponding channel according to the set state.
- 16 illustrates a method of receiving ACK / NACK by a terminal according to embodiment 4-2.
- DL CCs 0 and 1 and UL CCs 0 and 1 may be configured for the UE.
- the UE may receive a PHICH cell and an E-PHICH cell to receive ACK / NACK for each of UL CCs 0 and 1 through an RRC message.
- the UL CC 0 may receive ACK / NACK through a PHICH of DL CC 0, and the UL CC 1 may receive information indicating that ACK / NACK should be received through an E-PHICH of DL CC 1 through an RRC message. Can be.
- the UE receives UL grants for UL CC 0 and 1 through the E-PDCCH of DL CC 0 and transmits a PUSCH in UL CC 0 and 1 according to the UL grants.
- the ACK / NACK for the PUSCH transmitted in UL CC 0 is received through the PHICH of DL CC 0, and the ACK / NACK for the PUSCH transmitted in UL CC 1 is received through the E-PHICH of DL CC 1.
- UL grants, PHICHs, and E-PHICHs are not transmitted simultaneously in the same subframe, but are only indicated within the same subframe for convenience of description.
- Embodiment 4-3 In case of UL HARQ process scheduled by PDCCH, PHICH may be used, and in case of UL HARQ process scheduled by E-PDCCH, E-PHICH may be used.
- a cell / subframe that does not transmit PHICH or E-PHICH it may not be a monitoring cell of the UL grant.
- the cell in which the UL grant is located whether through the PDCCH or the E-PDCCH, becomes a cell capable of transmitting ACK / NACK for the PUSCH, and the UL grant and the PHICH (or E-PHICH) may be configured to exist in the same cell. This is to configure a UL scheduling related control signal in one cell having a good channel state.
- the UL grant may be transmitted on the E-PDCCH.
- the UL grant may be cross-carrier scheduled from the cell in which the PHICH (or E-PHICH) is configured.
- the DL grant may allow the DL grant to also be located in the same cell as the UL grant for simplicity of non-cross carrier scheduling or scheduling.
- a method of configuring an E-PHICH may be changed according to a state.
- the start OFDM symbol position of the E-PHICH is the same as the E-PDCCH, and in the case of the subframe in which the E-PDCCH does not exist, the corresponding UL HARQ process does not have the PHICH.
- the transmission (Example 2-4) or the PHICH of another cell (for example, a primary cell) can be used.
- FIG. 17 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
- the base station 100 includes a processor 110, a memory 120, and an RF unit 130.
- the processor 110 implements the proposed functions, processes and / or methods. For example, the processor 110 may allocate a plurality of serving cells to the terminal and transmit PHICH cell indication information indicating a PHICH (PHHYCAR) cell through a higher layer signal. In addition, whether or not cross-carrier scheduling is set, and the UL grant is transmitted through the PDCCH or E-PDCCH. In addition, the UE receives the PUSCH and transmits an ACK / NACK for the data included in the PUSCH through the PHICH or the E-PHICH.
- the PHICH cell indication information may be unnecessary when a rule for ACK / NACK is transmitted through which channel and which channel implicitly is transmitted between the BS and the UE in advance.
- the memory 120 is connected to the processor 110 and stores various information for driving the processor 110.
- the RF unit 130 is connected to the processor 110 and transmits and / or receives a radio signal.
- the terminal 200 includes a processor 210, a memory 220, and an RF unit 230.
- the processor 210 implements the proposed functions, processes and / or methods.
- the processor 210 may receive the ACK / NACK for the PUSCH transmission through the PHICH or the E-PHICH according to the method disclosed in FIGS. 13 to 16 described above.
- ACK / NACK may be received through a DCI format included in a PDCCH or an E-PDCCH instead of a separate channel (PHICH or E-PHICH).
- the memory 220 is connected to the processor 210 and stores various information for driving the processor 210.
- the RF unit 230 is connected to the processor 210 to transmit and / or receive a radio signal.
- Processors 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
- the memory 120, 220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
- the RF unit 130 and 230 may include one or more antennas for transmitting and / or receiving a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
- the module may be stored in the memories 120 and 220 and executed by the processors 110 and 210.
- the memories 120 and 220 may be inside or outside the processors 110 and 210, and may be connected to the processors 110 and 210 by various well-known means.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims (14)
- 무선통신 시스템에서 복수의 서빙 셀들을 할당 받은 단말의 ACK/NACK(acknowledgement/not-acknowledgement) 수신 방법에 있어서,
PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고, 및
상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)을 PHICH(Physical Hybrid-ARQ Indicator Channel)를 통해 수신하되,
상기 ACK/NACK을 수신하는 서빙 셀은 상기 단말이 상기 PUSCH를 스케줄링하는 상향링크 그랜트를 검출하기 위해 모니터링해야 하는 적어도 하나의 서빙 셀들 중 에서 선택되는 것을 특징으로 하는 방법. - 제1 항에 있어서, 상기 모니터링해야 하는 적어도 하나의 서빙 셀들이 복수인 경우,
상기 ACK/NACK은 프라이머리 셀을 통해 수신되며,
상기 프라이머리 셀은 상기 단말의 네트워크로의 최초 접속 및 재접속에 사용되는 서빙 셀인 것을 특징으로 하는 방법. - 제 1 항에 있어서, 상기 PUSCH를 스케줄링하는 상향링크 그랜트는 E-PDCCH(enhanced-physical downlink control channel: E-PDCCH)를 통해 수신되며,
상기 E-PDCCH는 상기 단말에 특정적인 참조 신호를 이용하여 디코딩되는 제어 채널인 것을 특징으로 하는 방법. - 무선통신 시스템에서 복수의 서빙 셀들을 할당 받은 단말의 ACK/NACK(acknowledgement/not-acknowledgement) 수신 방법에 있어서,
PHICH(Physical Hybrid-ARQ Indicator Channel)셀을 지시하는 PHICH 셀 지시 정보를 수신하고,
PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고, 및
상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)을 PHICH(Physical Hybrid-ARQ Indicator Channel)를 통해 수신하되,
상기 ACK/NACK은 상기 PHICH 셀 지시 정보가 지시하는 서빙 셀을 통해 수신되는 것을 특징으로 하는 방법. - 제4 항에 있어서, 상기 PHICH 셀 지시 정보는 RRC(radio resource control) 메시지를 통해 수신되는 것을 특징으로 하는 방법.
- 제 4 항에 있어서, 상기 PUSCH를 스케줄링하는 상향링크 그랜트는 E-PDCCH(enhanced-physical downlink control channel)를 통해 수신되며,
상기 E-PDCCH는 상기 단말에 특정적인 참조 신호를 이용하여 디코딩되는 제어 채널인 것을 특징으로 하는 방법. - 무선통신 시스템에서 복수의 서빙 셀들을 할당 받은 단말의 ACK/NACK(acknowledgement/not-acknowledgement) 수신 방법에 있어서,
PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고,
E-PDCCH(enhanced-physical downlink control channel)를 통해 상향링크 그랜트를 수신하고, 및
상기 상향링크 그랜트에 기반하여 상기 상향링크 데이터에 대한 재전송 또는 새로운 상향링크 데이터를 전송하되,
상기 상향링크 그랜트를 수신하는 서브프레임에는 상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)이 전송되는 PHICH(Physical Hybrid-ARQ Indicator Channel) 대신 상기 상향링크 그랜트가 포함되는 것을 특징으로 하는 방법. - 제 7 항에 있어서, 상기 상향링크 그랜트는 상기 상향링크 그랜트가 새로운 데이터에 대한 것인지 여부를 나타내는 NDI(new data indicator) 필드를 포함하고, 상기 NDI 필드의 값에 따라 상기 상향링크 데이터에 대한 재전송 또는 새로운 상향링크 데이터의 전송을 지시하는 것을 특징으로 하는 방법.
- 무선통신 시스템에서 복수의 서빙 셀들을 할당 받은 단말의 ACK/NACK(acknowledgement/not-acknowledgement) 수신 방법에 있어서,
PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고, 및
상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)을 PHICH(Physical Hybrid-ARQ Indicator Channel)를 통해 수신하되,
상기 ACK/NACK을 수신하는 서빙 셀은 상기 PUSCH를 스케줄링하는 상향링크 그랜트를 수신한 서빙 셀이고,
상기 상향링크 그랜트는 E-PDCCH(enhanced-physical downlink control channel)를 통해 수신되며,
상기 E-PDCCH는 상기 단말에 특정적인 참조 신호를 이용하여 디코딩되는 제어 채널인 것을 특징으로 하는 방법. - 제 9항에 있어서, 상기 상향링크 그랜트를 수신하는 서빙 셀은 서브프레임 별로 E-PDCCH 및 PDCCH(physical downlink control channel) 중 어느 하나에서 상향링크 그랜트를 검색하도록 설정되는 것을 특징으로 하는 방법.
- 무선 신호를 송신 및 수신하는 RF(radio frequency)부; 및
상기 RF부와 연결되는 프로세서를 포함하되,
상기 프로세서는 PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고, 및 상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)을 PHICH(Physical Hybrid-ARQ Indicator Channel)를 통해 수신하되, 상기 ACK/NACK을 수신하는 서빙 셀은 상기 단말이 상기 PUSCH를 스케줄링하는 상향링크 그랜트를 검출하기 위해 모니터링해야 하는 적어도 하나의 서빙 셀들 중에서 선택되는 것을 특징으로 하는 단말. - 무선 신호를 송신 및 수신하는 RF(radio frequency)부; 및
상기 RF부와 연결되는 프로세서를 포함하되,
상기 프로세서는 PHICH(Physical Hybrid-ARQ Indicator Channel)셀을 지시하는 PHICH 셀 지시 정보를 수신하고,
PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고, 및
상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)을 PHICH(Physical Hybrid-ARQ Indicator Channel)를 통해 수신하되,
상기 ACK/NACK은 상기 PHICH 셀 지시 정보가 지시하는 서빙 셀을 통해 수신되는 것을 특징으로 하는 단말. - 무선 신호를 송신 및 수신하는 RF(radio frequency)부; 및
상기 RF부와 연결되는 프로세서를 포함하되,
상기 프로세서는 PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고,
E-PDCCH(enhanced-physical downlink control channel)를 통해 상향링크 그랜트를 수신하고, 및
상기 상향링크 그랜트에 기반하여 상기 상향링크 데이터에 대한 재전송 또는 새로운 상향링크 데이터를 전송하되,
상기 상향링크 그랜트를 수신하는 서브프레임에는 상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)이 전송되는 PHICH(Physical Hybrid-ARQ Indicator Channel) 대신 상기 상향링크 그랜트가 포함되는 것을 특징으로 하는 단말. - 무선 신호를 송신 및 수신하는 RF(radio frequency)부; 및
상기 RF부와 연결되는 프로세서를 포함하되,
상기 프로세서는 PUSCH(physical uplink shared channel)를 통해 상향링크 데이터를 전송하고, 및 상기 상향링크 데이터에 대한 ACK/NACK(acknowledgement/not-acknowledgement)을 PHICH(Physical Hybrid-ARQ Indicator Channel)를 통해 수신하되,
상기 ACK/NACK을 수신하는 서빙 셀은 상기 PUSCH를 스케줄링하는 상향링크 그랜트를 수신한 서빙 셀이고, 상기 상향링크 그랜트는 E-PDCCH(enhanced-physical downlink control channel)를 통해 수신되며, 상기 E-PDCCH는 상기 단말에 특정적인 참조 신호를 이용하여 디코딩되는 제어 채널인 것을 특징으로 하는 단말.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12846167.0A EP2757725B1 (en) | 2011-11-01 | 2012-11-01 | Method and apparatus for receiving ack/nack in wireless communication system |
CN201280053645.0A CN103918211A (zh) | 2011-11-01 | 2012-11-01 | 无线通信***中用于接收ack/nack的方法和设备 |
KR1020147011378A KR101634466B1 (ko) | 2011-11-01 | 2012-11-01 | 무선통신 시스템에서 ack/nack 수신 방법 및 장치 |
ES12846167T ES2797449T3 (es) | 2011-11-01 | 2012-11-01 | Método y aparato para recibir ACK/NACK en sistema de comunicación inalámbrica |
US14/350,551 US9843430B2 (en) | 2011-11-01 | 2012-11-01 | Method and apparatus for receiving ACK/NACK in wireless communication system |
US15/803,554 US10326579B2 (en) | 2011-11-01 | 2017-11-03 | Method and apparatus for receiving ACK/NACK in wireless communication system |
US16/400,744 US11082188B2 (en) | 2011-11-01 | 2019-05-01 | Method and apparatus for receiving ACK/NACK in wireless communication system |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161554470P | 2011-11-01 | 2011-11-01 | |
US61/554,470 | 2011-11-01 | ||
US201261594387P | 2012-02-03 | 2012-02-03 | |
US61/594,387 | 2012-02-03 | ||
US201261650989P | 2012-05-23 | 2012-05-23 | |
US61/650,989 | 2012-05-23 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/350,551 A-371-Of-International US9843430B2 (en) | 2011-11-01 | 2012-11-01 | Method and apparatus for receiving ACK/NACK in wireless communication system |
US15/803,554 Continuation US10326579B2 (en) | 2011-11-01 | 2017-11-03 | Method and apparatus for receiving ACK/NACK in wireless communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013066086A1 true WO2013066086A1 (ko) | 2013-05-10 |
Family
ID=48192369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2012/009142 WO2013066086A1 (ko) | 2011-11-01 | 2012-11-01 | 무선통신 시스템에서 ack/nack 수신 방법 및 장치 |
Country Status (6)
Country | Link |
---|---|
US (3) | US9843430B2 (ko) |
EP (1) | EP2757725B1 (ko) |
KR (1) | KR101634466B1 (ko) |
CN (1) | CN103918211A (ko) |
ES (1) | ES2797449T3 (ko) |
WO (1) | WO2013066086A1 (ko) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104811284A (zh) * | 2014-01-29 | 2015-07-29 | 上海贝尔股份有限公司 | 为mtc ue进行上行链路传输反馈的方法和装置 |
EP2991256A4 (en) * | 2013-05-21 | 2016-06-29 | Zte Corp | METHOD, BASIC STATION, END UNIT AND SYSTEM FOR TRANSMITTING HARQ INFORMATION |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103918211A (zh) | 2011-11-01 | 2014-07-09 | Lg电子株式会社 | 无线通信***中用于接收ack/nack的方法和设备 |
US10079658B2 (en) | 2011-11-04 | 2018-09-18 | Qualcomm Incorporated | Search space design for e-PDCCH in wireless communication networks |
US9860023B2 (en) | 2013-03-15 | 2018-01-02 | Lg Electronics Inc. | Method and device for receiving ACK/NACK in wireless communication system |
CN104104486A (zh) * | 2013-04-12 | 2014-10-15 | 北京三星通信技术研究有限公司 | 一种支持多子帧调度上行数据传输的方法和设备 |
EP3429295B1 (en) | 2013-08-07 | 2019-10-23 | Sun Patent Trust | Communication apparatus and method |
WO2015113214A1 (en) | 2014-01-28 | 2015-08-06 | Mediatek Singapore Pte. Ltd. | Methods for enhanced harq mechanism |
EP3114789B1 (en) * | 2014-03-06 | 2024-05-15 | InterDigital Patent Holdings, Inc. | Full duplex operation in wireless systems |
WO2016018056A1 (ko) * | 2014-07-28 | 2016-02-04 | 엘지전자 주식회사 | 하향링크 제어 정보 수신 방법 및 사용자기기와, 하향링크 제어 정보 전송 방법 및 기지국 |
US11057921B2 (en) * | 2014-10-01 | 2021-07-06 | Samsung Electronics Co., Ltd. | System and method for improving spectral efficiency and coverage for user equipments |
US10652003B2 (en) * | 2015-01-22 | 2020-05-12 | Texas Instruments Incorporated | HARQ design for high performance wireless backhaul |
US10349438B2 (en) * | 2015-03-17 | 2019-07-09 | Qualcomm Incorporated | Scheduling enhancements for contention-based shared frequency spectrum |
WO2016165123A1 (en) * | 2015-04-17 | 2016-10-20 | Mediatek Singapore Pte. Ltd. | Enhancement for harq with channel repetitions |
CN106470467B (zh) * | 2015-08-14 | 2021-04-20 | 中兴通讯股份有限公司 | 一种监听控制方法、终端、基站和*** |
CN106612557B (zh) * | 2015-10-26 | 2020-02-18 | ***通信集团公司 | 下行ack/nack信息的传输方法、基站及用户设备 |
US11277235B2 (en) * | 2015-11-23 | 2022-03-15 | Qualcomm Incorporated | Techniques for multiplexing or cascading control information and data within a transmission time interval |
CN108141877B (zh) * | 2016-02-03 | 2022-03-18 | Lg 电子株式会社 | 无线通信***中执行用户设备触发的半静态调度激活的方法和装置 |
CN107294671B (zh) * | 2016-03-30 | 2021-07-30 | 中兴通讯股份有限公司 | 随机接入的子帧的发送方法及装置 |
CN111050408B (zh) * | 2016-04-01 | 2022-07-29 | 展讯通信(上海)有限公司 | 上行传输的反馈方法和***、基站和用户设备 |
EP3446536B1 (en) * | 2016-04-21 | 2020-04-08 | Telefonaktiebolaget LM Ericsson (publ) | Status detection of rrc connection |
CN107370563B (zh) | 2016-05-13 | 2021-11-02 | 中兴通讯股份有限公司 | 信息传输方法及装置 |
JP2019134199A (ja) * | 2016-06-03 | 2019-08-08 | シャープ株式会社 | 端末装置、基地局装置、通信方法、および、集積回路 |
CN109845374B (zh) * | 2016-10-17 | 2023-05-26 | 高通股份有限公司 | 半自主传输 |
WO2018126382A1 (en) * | 2017-01-05 | 2018-07-12 | Nec Corporation | Method and device for indicating resource allocation |
CA3066169A1 (en) * | 2017-06-09 | 2018-12-13 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Wireless communication method, terminal device and network device |
CN109121212B (zh) * | 2017-06-24 | 2021-06-08 | 华为技术有限公司 | 数据传输方法、数据传输反馈方法和相关设备 |
CN110999155B (zh) * | 2017-08-10 | 2021-07-09 | 中兴通讯股份有限公司 | 在无线通信中发送和接收控制信息的方法和装置 |
KR102071393B1 (ko) * | 2017-09-06 | 2020-03-02 | 엘지전자 주식회사 | 무선 통신에서의 자원 관리 |
US11057153B2 (en) * | 2018-05-11 | 2021-07-06 | Qualcomm Incorporated | Multi-user data packet |
US11963180B2 (en) * | 2018-08-10 | 2024-04-16 | Lg Electronics Inc. | Method and device for transmitting and receiving signals in wireless communication system |
EP3648383A1 (en) * | 2018-10-31 | 2020-05-06 | Panasonic Intellectual Property Corporation of America | Harq-ack handling with multiple pucch in multi-trp transmission in nr |
KR20210118200A (ko) * | 2019-05-03 | 2021-09-29 | 엘지전자 주식회사 | 무선 통신 시스템에서 신호를 송수신하는 방법 및 장치 |
CN113796140B (zh) * | 2019-05-03 | 2023-10-20 | Lg电子株式会社 | 在无线通信***中发送和接收信号的方法和装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110010681A (ko) * | 2009-07-26 | 2011-02-07 | 엘지전자 주식회사 | 무선 통신 시스템에서 수신 확인 수신 방법 및 장치 |
KR20110073334A (ko) * | 2009-12-22 | 2011-06-29 | 엘지전자 주식회사 | 무선 통신 시스템에서 상향링크 harq 수행 장치 및 방법 |
KR20110096482A (ko) * | 2010-02-22 | 2011-08-30 | 엘지전자 주식회사 | Ack/nack 정보를 전송하는 방법 및 이를 위한 장치와, ack/nack 정보를 수신하는 방법 및 이를 위한 장치 |
US20110249619A1 (en) * | 2010-04-13 | 2011-10-13 | Yi Yu | Wireless communication system using multiple-serving nodes |
JP2011211494A (ja) * | 2010-03-30 | 2011-10-20 | Sharp Corp | 無線通信システム、移動局装置、基地局装置、無線通信方法および集積回路 |
Family Cites Families (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI225339B (en) * | 2002-06-06 | 2004-12-11 | Via Telecom Co Ltd | Power control of plural packet data control channels |
DE60311574T2 (de) | 2003-08-14 | 2007-11-15 | Matsushita Electric Industrial Co., Ltd., Kadoma | Zeitüberwachung von Packetwiedersendungen während eines sanften Weiterreichens |
US7680094B2 (en) * | 2003-09-29 | 2010-03-16 | Alcatel-Lucent Usa Inc. | Method of aligning physical channels for uplink transmission |
US20060084459A1 (en) * | 2004-10-13 | 2006-04-20 | Vinh Phan | Outer loop power control of user equipment in wireless communication |
CN101371464A (zh) * | 2005-12-14 | 2009-02-18 | 艾利森电话股份有限公司 | 用于扩频接收器的按要求解扩 |
US7984356B2 (en) * | 2006-12-07 | 2011-07-19 | Nokia Siemens Networks Oy | Acknowledgments or negative acknowledgments by relay stations and subscriber stations |
US20080253326A1 (en) * | 2007-04-13 | 2008-10-16 | Qualcomm Incorporated | Synchronous adaptive harq |
US8522101B2 (en) * | 2008-04-15 | 2013-08-27 | Qualcomm Incorporated | Physical HARQ indicator channel (PHICH) resource assignment signaling in a wireless communication environment |
KR100937433B1 (ko) | 2008-09-17 | 2010-01-18 | 엘지전자 주식회사 | 최대 전송 회수를 고려한 harq 동작 방법 |
US8842617B2 (en) * | 2008-10-01 | 2014-09-23 | Lg Electronics Inc. | Method and device for wireless subframe resource allocation |
CN102177674B (zh) * | 2008-10-08 | 2014-12-03 | 爱立信电话股份有限公司 | 用于选择物理下行链路控制信道的控制信道元素的方法和设备 |
KR101253202B1 (ko) | 2008-10-29 | 2013-04-10 | 엘지전자 주식회사 | 광대역 지원을 위한 다중 캐리어 결합 상황에서 효과적인 물리 채널 전송방법 |
US9450727B2 (en) * | 2009-02-03 | 2016-09-20 | Google Technology Holdings LLC | Physical layer acknowledgement signaling resource allocation in wireless communication systems |
JP5152056B2 (ja) * | 2009-03-19 | 2013-02-27 | 富士通モバイルコミュニケーションズ株式会社 | 無線送信装置、無線受信装置および無線通信方法 |
CN102396176B (zh) * | 2009-04-17 | 2015-07-15 | Lg电子株式会社 | 用于检测来自转发器的harq/nack反馈信号的方法 |
EP2446570B1 (en) * | 2009-06-25 | 2013-11-20 | Telefonaktiebolaget L M Ericsson (PUBL) | Methods and devices for transmitting a control message |
JP5477461B2 (ja) | 2009-08-14 | 2014-04-23 | 日本電気株式会社 | Phichキャリアリンケージの設定方法 |
CN101662833A (zh) | 2009-09-29 | 2010-03-03 | 中兴通讯股份有限公司 | 上行混合重传反馈信息分量载波的选择方法及装置 |
US9379851B2 (en) | 2009-10-20 | 2016-06-28 | Lg Electronics Inc. | Method and apparatus for transmitting acknowledgement in wireless communication system |
CN102014510B (zh) * | 2009-11-03 | 2015-02-25 | 电信科学技术研究院 | 一种上行控制信道资源配置的方法、设备及*** |
KR20110055367A (ko) * | 2009-11-17 | 2011-05-25 | 엘지전자 주식회사 | 다중 안테나 시스템에서 harq 수행 방법 및 장치 |
US8804586B2 (en) * | 2010-01-11 | 2014-08-12 | Blackberry Limited | Control channel interference management and extended PDCCH for heterogeneous network |
KR101695023B1 (ko) * | 2010-03-29 | 2017-01-10 | 삼성전자주식회사 | 다중 안테나 기술을 지원하는 무선 통신 시스템의 상향 링크에서 재전송 제어 방법 및 장치 |
US8711790B2 (en) * | 2011-02-11 | 2014-04-29 | Nokia Corporation | DL control channel structure enhancement |
WO2013010305A1 (en) * | 2011-07-15 | 2013-01-24 | Panasonic Corporation | Method of scrambling signals, transmission point device and user equipment using the method |
CN103918211A (zh) | 2011-11-01 | 2014-07-09 | Lg电子株式会社 | 无线通信***中用于接收ack/nack的方法和设备 |
-
2012
- 2012-11-01 CN CN201280053645.0A patent/CN103918211A/zh active Pending
- 2012-11-01 KR KR1020147011378A patent/KR101634466B1/ko active IP Right Grant
- 2012-11-01 EP EP12846167.0A patent/EP2757725B1/en active Active
- 2012-11-01 US US14/350,551 patent/US9843430B2/en active Active
- 2012-11-01 ES ES12846167T patent/ES2797449T3/es active Active
- 2012-11-01 WO PCT/KR2012/009142 patent/WO2013066086A1/ko active Application Filing
-
2017
- 2017-11-03 US US15/803,554 patent/US10326579B2/en active Active
-
2019
- 2019-05-01 US US16/400,744 patent/US11082188B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20110010681A (ko) * | 2009-07-26 | 2011-02-07 | 엘지전자 주식회사 | 무선 통신 시스템에서 수신 확인 수신 방법 및 장치 |
KR20110073334A (ko) * | 2009-12-22 | 2011-06-29 | 엘지전자 주식회사 | 무선 통신 시스템에서 상향링크 harq 수행 장치 및 방법 |
KR20110096482A (ko) * | 2010-02-22 | 2011-08-30 | 엘지전자 주식회사 | Ack/nack 정보를 전송하는 방법 및 이를 위한 장치와, ack/nack 정보를 수신하는 방법 및 이를 위한 장치 |
JP2011211494A (ja) * | 2010-03-30 | 2011-10-20 | Sharp Corp | 無線通信システム、移動局装置、基地局装置、無線通信方法および集積回路 |
US20110249619A1 (en) * | 2010-04-13 | 2011-10-13 | Yi Yu | Wireless communication system using multiple-serving nodes |
Non-Patent Citations (3)
Title |
---|
"Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 10", 3GPP TS 36.211 V10.2.0, June 2011 (2011-06-01) |
3GPP TS 36.213 V10.2.0, June 2011 (2011-06-01) |
See also references of EP2757725A4 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2991256A4 (en) * | 2013-05-21 | 2016-06-29 | Zte Corp | METHOD, BASIC STATION, END UNIT AND SYSTEM FOR TRANSMITTING HARQ INFORMATION |
US10033486B2 (en) | 2013-05-21 | 2018-07-24 | Zte Corporation | Method for transmitting HARQ information, base station, terminal and system |
CN104184564B (zh) * | 2013-05-21 | 2019-01-04 | 中兴通讯股份有限公司 | 一种harq信息发送的方法及装置 |
CN104811284A (zh) * | 2014-01-29 | 2015-07-29 | 上海贝尔股份有限公司 | 为mtc ue进行上行链路传输反馈的方法和装置 |
WO2015114459A1 (en) * | 2014-01-29 | 2015-08-06 | Alcatel Lucent | Methods and apparatuses for ul transmission feedback for mtc ue |
CN104811284B (zh) * | 2014-01-29 | 2019-05-31 | 上海诺基亚贝尔股份有限公司 | 为mtc ue进行上行链路传输反馈的方法和装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20140093222A (ko) | 2014-07-25 |
EP2757725A1 (en) | 2014-07-23 |
EP2757725A4 (en) | 2015-11-04 |
US20190260550A1 (en) | 2019-08-22 |
KR101634466B1 (ko) | 2016-07-08 |
US20180062818A1 (en) | 2018-03-01 |
ES2797449T3 (es) | 2020-12-02 |
EP2757725B1 (en) | 2020-04-01 |
US9843430B2 (en) | 2017-12-12 |
CN103918211A (zh) | 2014-07-09 |
US20140348091A1 (en) | 2014-11-27 |
US11082188B2 (en) | 2021-08-03 |
US10326579B2 (en) | 2019-06-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11082188B2 (en) | Method and apparatus for receiving ACK/NACK in wireless communication system | |
US10057039B2 (en) | Method and apparatus for receiving ACK/NACK in wireless communication system | |
JP6786665B2 (ja) | アンライセンスバンドをサポートする無線アクセスシステムにおいて部分サブフレームを構成してスケジューリングする方法及びこれをサポートする装置 | |
US11057182B2 (en) | Method and apparatus for transmitting reception acknowledgement in wireless communication system | |
US10477531B2 (en) | Method and device for setting a control channel and a data channel in a wireless communication system | |
KR101666286B1 (ko) | 무선통신 시스템에서 데이터 채널의 시작 위치 설정 방법 및 상기 방법을 이용하는 장치 | |
KR101612667B1 (ko) | 무선통신 시스템에서 상향링크 제어 채널을 위한 자원 할당 방법 및 장치 | |
KR101549763B1 (ko) | 반송파 집성 시스템에서 스케줄링 방법 및 장치 | |
KR101455559B1 (ko) | 반송파 집성 시스템에서 스케줄링 방법 및 장치 | |
KR101530800B1 (ko) | 무선통신 시스템에서 수신확인 전송 방법 및 장치 | |
KR101798740B1 (ko) | 무선 통신 시스템에서 ack/nack 수신 방법 및 장치 | |
US20140161085A1 (en) | Method for transmitting and receiving resource allocation information in wireless communication system and apparatus therefor | |
US20140355451A1 (en) | Method for monitoring a downlink control channel, and wireless device | |
US11251924B2 (en) | Method and apparatus for designing ACK/NACK channel in wireless communication system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12846167 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14350551 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012846167 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 20147011378 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |