WO2013165184A1 - 무선 통신 시스템에서 무선 자원 동적 변경에 기반한 harq 수행 방법 및 이를 위한 장치 - Google Patents
무선 통신 시스템에서 무선 자원 동적 변경에 기반한 harq 수행 방법 및 이를 위한 장치 Download PDFInfo
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- uplink
- downlink subframe
- subframe configuration
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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
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- 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
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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
- 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
- H04L1/189—Transmission or retransmission of more than one copy of a message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- 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
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1461—Suppression of signals in the return path, i.e. bidirectional control circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for performing a hybrid automatic repeat and reQuest (HARQ) based on a dynamic change of radio resources in a wireless communication system, and an apparatus therefor.
- HARQ hybrid automatic repeat and reQuest
- a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described in brief.
- E-UMTSC Evolved Universal Mobile Telecommuni ions System
- LTE Long Term Evolution
- an EU TS is located at an end of a user equipment (UE) and a base station (eNode B), an access gateway (AG) connected to an external network at an end point of an e-UTRAN.
- UE user equipment
- eNode B base station
- AG access gateway
- a base station can transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
- Sal is set to one of the bandwidth of 1.25, 2.5, 5, 10, 15, 20Mhz, etc. to provide a downlink or uplink transmission service to multiple terminals. Different cells may be configured to provide different bandwidths.
- the base station controls data transmission and reception for a plurality of terminals.
- For downlink (DL) data the base station transmits downlink scheduling information to inform the corresponding terminal of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
- the base station transmits uplink scheduling information to uplink UL data for uplink (UL) data and informs the corresponding time / frequency domain, encoding, data size, HARQ related information, and the like.
- the core network may be composed of an AG and a network node for user registration of the terminal.
- the AG manages mobility of the UE in units of a TA Tracking Area including a plurality of cells.
- the present invention proposes a method and apparatus for performing HARQ based on dynamic change of radio resources in a wireless communication system.
- a method in which a UE transmits and receives a signal through a predetermined carrier with a base station includes uplink / downlink subframe settings that can be dynamically changed from a base station. Receiving information regarding; Selecting a representative uplink / downlink subframe configuration among the uplink / downlink subframe configurations; And performing a hybrid automatic repeat and request (HARQ) operation according to the representative uplink / downlink subframe configuration.
- HARQ hybrid automatic repeat and request
- the dynamically uplink / downlink subframe The settings are determined based on a default uplink / downlink subframe configuration indicated through the switching period and system information of each of the uplink / downlink subframe configuration.
- the performing of the HARQ operation may include receiving a downlink data channel and an uplink ACK for the downlink data channel based on the representative uplink / downlink subframe configuration.
- the method may include performing retransmission of an uplink data channel according to signal reception.
- the HARQ timing of the representative uplink / downlink subframe configuration is based on the HARQ timing of the default uplink / downlink subframe configuration indicated through system information indicated by system information. Characterized in that it is determined.
- the representative uplink / downlink subframe configuration for the predetermined carrier may include representative uplink / downlink of the other carrier. Characterized as a subframe configuration.
- a terminal apparatus in a TDD communication system includes: a wireless communication module for transmitting and receiving a signal with a base station; And a processor for processing the signal, the processor receiving information about uplink / downlink subframe settings that can be dynamically changed from the base station, and receiving the uplink / downlink subframe settings.
- a representative uplink / downlink subframe configuration is selected, and a hybrid automatic repeat and reQuest (HARQ) operation is performed according to the representative uplink / downlink subframe configuration.
- HARQ hybrid automatic repeat and reQuest
- a terminal and a base station are wireless in a wireless communication system.
- the HARQ scheme can be efficiently performed while dynamically changing resources.
- FIG. 1 is a diagram schematically illustrating an E-UMTS network structure as an example of a wireless communication system.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a UE and an E—UTRAN based on a 3GPP radio access network standard.
- 3 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.
- FIG. 4 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
- FIG. 5 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- FIG. 6 illustrates a structure of a radio frame in an LTE TDD system.
- FIG. 7 is a diagram illustrating an uplink ACK / NACK transmission operation in an E-TDD system according to an embodiment of the present invention.
- FIG. 8 is a diagram illustrating a PUSCH scheduling operation in an E-TDD system according to an embodiment of the present invention.
- FIG 9 illustrates a timeline in which a PHICH or retransmission grant is transmitted in an E-TDD system according to an embodiment of the present invention.
- FIG. 10 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an example and the embodiment of the present invention can be applied to any communication system corresponding to the above definition.
- the present specification describes an embodiment of the present invention on the basis of the frequency division duplex (FDD) method, which is an exemplary embodiment of the present invention is a hybrid-FDD (H-FDD) method or a time division duplex (TDD). ) Can be easily modified and applied.
- FDD frequency division duplex
- H-FDD hybrid-FDD
- TDD time division duplex
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard.
- the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
- the user plane refers to a path through which data generated at an application layer, for example, voice data or inter packet packet data, is transmitted.
- the physical layer which is the first layer, provides an information transfer service to a higher layer by using a physical channel.
- the physical layer is connected to the upper layer of the medium access control layer through a trans-antenna port channel. Data moves between the medium access control layer and the physical layer through the transport channel. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel.
- the physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (0FDMA) scheme in the downlink, and modulated in the Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the uplink.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the RLC layer of the second layer supports reliable data transmission.
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the Layer 2 Packet Data Convergence Protocol (PDCP) layer is not required for efficient transmission of IP packets such as IPv4 or IPv6 over narrow bandwidth interfaces. It performs header compression function to reduce control information.
- PDCP Layer 2 Packet Data Convergence Protocol
- the radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
- the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, reconfiguration of radio bearers (RBs), and release.
- RB means a service provided by the second layer for data transmission between the terminal and the network.
- the RRC layers of the UE and the network exchange RRC messages with each other.
- RRC connected RRC Connected
- the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
- One cell constituting the base station (e NB) is set to one of bandwidths such as 1.4, 3, 5, 10, 15, and 20 MHz to provide downlink or uplink transmission services to various terminals. Different cells may be configured to provide different bandwidths.
- a downlink transport channel for transmitting data from a network to a terminal includes a BOKBroadcast Channel for transmitting system information, a PCH (paging channel) for transmitting a paging message, and a downlink shared channel (SCH) for transmitting a control message.
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
- the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
- RAC random access channel
- SCH uplink shared channel
- BCCH Broadcast Control Channel
- PCCH Paging Control Channel
- CCCH Common Control Channel
- MCCH Multicast Control Channel
- MTCH Multicast Traffic Channel
- the UE If the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. On the other hand, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
- the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- DL RS downlink reference signal
- the UE which has completed the initial cell search receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information carried on the PDCCH for a more specific system.
- Information can be obtained (S302).
- the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
- RACH random access procedure
- the UE may transmit a specific sequence to the preamble through a physical random access channel (PRACH) (S303 and S305), and may receive a voice response message for the preamble through the PDCCH and the Daesung PDSCH ( S304 and S306).
- PRACH physical random access channel
- a contention resolution procedure may be additionally performed.
- the UE After performing the procedure as described above, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel as a general uplink / downlink signal transmission procedure.
- Physical Uplink Control Channel (PUCCH) transmission (S308) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for the terminal, and the format is different depending on the purpose of use. .
- the control information received from the base station includes a downlink / uplink ACK / NACK signal, a CQI (Channel Quality Indicator), a PMK Precoding Matrix Index (RKR), and an RKRank Indicator.
- the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.
- FIG. 4 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
- a subframe consists of 14 OFDM symbols.
- the first 1 to 3 OFDM symbols are used as the control region and the remaining 13-11 OFDM symbols are used as the data region.
- R1 to R4 represent reference signals (RS) or pilot signals for antennas 0 to 3.
- the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
- the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
- Control channels allocated to the control region include PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel).
- the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
- the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
- the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in a control region based on a Cell ID (Cell IDentity).
- One REG is composed of four resource elements (REs).
- RE represents a minimum physical resource defined by one subcarrier and one OFDM symbol.
- the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by QPSKC Quadrature Phase Shift Keying.
- PHICH is a physical HARQ Hybrid-Automatic Repeat and request (EIQ) indicator channel and used to carry HARQ ACK / NACK for uplink transmission. That is, 'PHICH represents a channel on which DL ACK / NACK information for UL HARQ is transmitted.
- the PHICH consists of one REG and is scrambled cell-specifically.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- BPSK binary phase shift keying
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group. The number of PHICHs multiplexed into the PHICH group is determined according to the number of spreading codes.
- the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
- the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- the PDCCH consists of one or more CCE Control Channel Elements.
- the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and a downlink ink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
- PCH paging channel
- DL-SCH downlink ink-shared channel
- HARQ information Paging channel
- PCH downlink shared channel
- the base station and the terminal generally transmit and receive data through the PDSCH except for specific control information or specific service data.
- Data of PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted.
- a specific PDCCH is masked with a Radio Network Temporary Identity (RNTI) of " ⁇ ", and a radio resource (eg, frequency location) of "B” and a "C” of "C”.
- RNTI Radio Network Temporary Identity
- a radio resource eg, frequency location
- transmission type information eg, transmission block size, modulation scheme, coding information, etc.
- the terminal in the sal monitors the PDCCH using its own RNTI information, and if there is at least one terminal having the RNTI, the terminals receive the PDCCH, and "B" through the information of the received PDCCH And PDSCH indicated by "C".
- FIG. 5 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- the uplink subframe includes a PUCCH for carrying control information.
- the uplink control channel may be divided into an area to which an uplink control channel is allocated and an area to which a physical uplink shared channel (PUSCH) carrying user data is allocated.
- the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
- the control information transmitted on the PUCCH includes ACK / NACK used for HARQ, a CQKChannel Quality Indicator indicating a downlink channel state, a RKRank Indicator for MIM0), and a SR (Scheduling Request), which is an uplink resource allocation request.
- the PUCCH for one UE uses one resource block occupying a different frequency in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
- a radio frame is composed of two half frames, and each half frame includes four general subframes including two slots, a down link pilot time slot (DwPTS), and a guard period.
- DwPTS down link pilot time slot
- GP special subframe including an UpPTSOJplink Pilot Time Slot.
- DwPTS is used for initial cell search, synchronization, or channel estimation in a terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. That is, DwPTS is used for downlink transmission, UpPTS is used for uplink transmission, and in particular, UpPTS is used for PRACH preamble or SRS transmission.
- the guard interval is a period for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- the current 3GPP standard document defines a configuration as shown in Table 1 below.
- uplink / downlink subframe configuration (UL / DL configuration) in the LTE TDD system is shown in Table 2 below.
- D denotes a downlink subframe
- U denotes an uplink subframe
- S denotes the special subframe.
- Table 2 also shows downlink-to-uplink switch-point periodicity in uplink / downlink subframe configuration in each system.
- Table 3 shows an uplink subframe number (index) for the UE to transmit an uplink ACK / NACK for a corresponding downlink signal in a 3GPP LTE system-based TDD system.
- '-' indicates that an uplink subframe is set, and a similar number allocated to each subframe number indicates an uplink subframe index. That is, this indicates an uplink subframe index linked to the corresponding downlink subframe.
- Carrier aggregation is the frequency block, or (logical means configured to ⁇ Using a wide frequency band than the radio communication system, the UE uplink resources (or component carrier) and / or downlink resources (or component carrier) ) Means using multiple cells as one large logical frequency band.
- component carrier will be unified.
- the entire system bandwidth is a logical band having a bandwidth of up to 100 MHz.
- the entire system band includes five component carriers, and each component carrier has a bandwidth of up to 20 Hz z.
- a component carrier includes one or more contiguous subcarriers that are physically contiguous. Each component carrier may have the same bandwidth, or each component carrier may have a different bandwidth.
- each component carrier may be physically adjacent to each other or may be separated.
- the center frequency may be used differently for each component carrier or may use one common common carrier for physically adjacent component carriers. For example, assuming that all component carriers are physically adjacent, the center carrier A may be used. In addition, each Assuming that the component carriers are not physically adjacent to each other, the center carrier A, the center carrier B, and the like may be used separately for each component carrier.
- the component carrier may correspond to the system band of the legacy system.
- provision of backward compatibility and system design may be facilitated in a wireless communication environment in which an evolved terminal and a legacy terminal coexist.
- each component carrier may correspond to a system band of the LTE system.
- the component carrier may have any one of 1.25, 2.5, 5, 10, or 20 Mhz bandwidth.
- a frequency band used for communication with each terminal is defined in component carrier units.
- UE A may use 100 MHz, which is the entire system band, and performs communication using all five component carriers.
- UE Br3 ⁇ 4 may use only 20 MHz bandwidth and performs communication using one component carrier.
- UEs d and C 2 may use a 40 MHz bandwidth, and perform communication using two component carriers, respectively.
- the two component carriers may or may not be logically / physically adjacent to each other.
- the UE indicates the case of using two component carriers which are not adjacent, and the UE C2 indicates the case of using two adjacent component carriers.
- a method of scheduling a data channel by a control channel may be classified into a conventional linked carrier scheduling method and a cross carrier scheduling method.
- a control channel transmitted through a specific component carrier only schedules a data channel through the specific component carrier.
- a control channel transmitted through a primary component carrier (Crimary CC) using a carrier indicator field (CIF) is transmitted through the primary component carrier or another component carrier. Scheduling the data channel transmitted through.
- the TDD system divides the entire subframe into an uplink subframe and a downlink subframe and uses the uplink transmission of the UE and the downlink transmission of the eNB, respectively.
- This uplink / downlink subframe configuration is generally known to the UE as part of system information and can provide the configurations shown in Table 2 above.
- a new uplink / downlink subframe configuration may be additionally provided.
- the eNB may dynamically change the uplink / downlink subframe configuration for the TDD system at each time point. That is, the eNB may dynamically change whether each subframe is used for downlink or uplink.
- E-TDD Enhanced-TDD
- the present invention proposes an HARQ operation that can be effectively used when the eNB performs an E-TDD operation.
- the operation of the present invention described below can be applied to a case in which an eNB performs an E-TDD operation on one carrier (or SCell) when a carrier aggregation technique that aggregates and uses two or more component carriers is applied.
- it is also applicable to the case of operating the E-TDD on a single carrier without applying the carrier aggregation technique.
- HARQ operation is determined by uplink / downlink subframe configuration of a corresponding cell. That is, when the uplink / downlink subframe configuration is configured by the system information, the HARQ operation method for the uplink / downlink subframe configuration is automatically determined.
- HARQ operation includes an operation of transmitting an uplink ACK / NACK for a PDSCH transmitted by an eNB, an operation of monitoring a PHICH black or an uplink grant including a retransmission command for a PUSCH transmitted by the UE, and a PUSCH transmission indicated by the eNB. Operation to perform.
- the conventional HARQ operation is very difficult to apply in an E-TDD situation in which uplink / downlink subframe configuration is dynamically changed.
- the uplink / downlink subframe rather than changing the uplink / downlink subframe configuration itself at every point in time and explicitly indicating the uplink / downlink subframe configuration, the uplink / downlink subframe according to whether a scheduling message is transmitted on a preset uplink / downlink subframe configuration.
- the present invention determines a range of uplink / downlink subframe configuration that can be changed in a component carrier in advance and changes in an uplink that can be changed in performing a specific HARQ operation. It is proposed to select a representative uplink / downlink subframe configuration that can include a link / downlink subframe configuration.
- a problem may occur when an uplink subframe is relatively smaller than a downlink subframe, thereby reducing the transmission opportunity of the ACK / NACK.
- a specific subframe is regarded as an uplink subframe and uplink ACK / NACK was to be transmitted in this subframe.
- transmission of the corresponding uplink ACK / NACK is performed. The problem of losing opportunity arises.
- the eNB may inform the UE of candidates of uplink / downlink subframe configuration that may be selected by the E-TDD operation.
- an uplink / downlink subframe in which a subframe corresponding to the union of downlink subframes of all uplink / downlink subframe configurations that can be changed by the E-TDD operation is configured as a downlink subframe.
- the frame configuration is set to a representative uplink / downlink subframe configuration, and an uplink ACK / NACK is transmitted in an uplink subframe determined accordingly.
- Uplink / downlink subframe configuration having an uplink subframe set that exactly corresponds to an intersection of the uplink subframe the uplink to go to an uplink subframe as a subset of the corresponding intersection
- Uplink / downlink subframe configuration having the most uplink subframe among / downlink subframe configuration may be selected as a representative uplink / downlink subframe configuration.
- an uplink / downlink having a downlink subframe as a subset of the union One having the most downlink subframes among the link subframes may be selected as a representative uplink / downlink subframe configuration.
- any uplink / downlink subframe configuration among the uplink / downlink subframe configurations that can be changed by the E-TDD operation is selected as the representative uplink / downlink subframe configuration
- the representative uplink / downlink subframe configuration is selected. Since the subframe configured as the uplink subframe in the downlink subframe configuration is an uplink subframe in all uplink / downlink subframe configurations, an uplink ACK / NACK transmission opportunity is guaranteed. Therefore, if the representative uplink / downlink subframe configuration is selected and this is regarded as the uplink / downlink subframe configuration of the component carrier operating the E-TDD, HARQ operation can be performed smoothly.
- FIG. 7 is a diagram illustrating an uplink ACK / NACK transmission operation in an E ⁇ TDD system according to an embodiment of the present invention.
- the eNB dynamically selects and uses one of uplink / downlink subframe configuration # 1 and uplink / downlink subframe configuration # 2 on the corresponding carrier.
- uplink / downlink subframe configuration is set as a representative uplink / downlink subframe configuration corresponding to an intersection of uplink subframes. You can see that # 2 is selected. Accordingly, the UE transmits uplink ACK / NACK according to uplink / downlink subframe configuration # 2. That is, uplink ACK / NACK transmission is transmitted in subframe # 2 and subframe # 7 which are uplink subframes in the representative uplink / downlink subframe configuration.
- an uplink ACK / NACK for a PDSCH transmitted in a specific downlink subframe or a special subframe is transmitted in an uplink subframe connected by an arrow, and a subframe indicated by hatching is an uplink operated by an actual eNB. This indicates a mismatch between the link / downlink subframe configuration and the representative uplink / downlink subframe configuration for uplink ACK / NACK.
- an arrow indicated by a broken line indicates an HA Q time for which UL ACK / NACK does not actually need to be transmitted due to a mismatch between actual uplink / downlink subframe configuration and representative uplink / downlink subframe configuration. Means line.
- the above-described principles of the present invention can be applied to an operation of determining the scheduling timing of a PUSCH.
- the UE receives an uplink grant or PHICH NACK in a specific downlink subframe #n
- the UE transmits a PUSCH in uplink subframe # n + k, and the relationship between subframe ⁇ and subframe # n + k. Is determined by uplink / downlink subframe configuration.
- the E-TDD system is operated in a specific component carrier, even if the UE transmits an uplink grant in subframe #n, the UE recognizes that the subframe # n + k is a downlink subframe through system information. It is impossible to utilize subframe # n + k for PUSCH transmission.
- a subframe corresponding to the union of uplink subframes is configured as an uplink subframe on all uplink / downlink subframe configurations that can be changed by the E-TDD operation.
- Uplink / downlink ' subframe that represents the uplink / downlink subframe configuration By setting the configuration, and determines the transmission time of the scheduling information (ie, uplink grant) of the PUSCH.
- the representative uplink / downlink subframe configuration is selected.
- a PUSCH transmission time according to an uplink grant is defined.
- an uplink / having an uplink subframe having the corresponding subset as a subset may be selected as the representative uplink / downlink subframe configuration.
- the HARQ operation is performed by selecting a representative uplink / downlink subframe configuration in this manner and considering this as an uplink / downlink subframe configuration of a component carrier operating in an E-TDD system, the HARQ operation is performed. It can be done smoothly.
- FIG. 8 is a diagram illustrating a PUSCH scheduling operation in an E-TDD system according to an embodiment of the present invention.
- FIG. 8 also assumes that the eNB dynamically selects and uses one of uplink / downlink subframe configuration # 1 and uplink / downlink subframe configuration # 2.
- uplink / downlink subframe configuration # 1 which is a changeable uplink / downlink subframe configuration
- uplink subframe of uplink / downlink subframe configuration # 2 Since the representative uplink / downlink subframe configuration is the uplink / downlink subframe configuration # 1 according to the uplink grant and PUSCH transmission time is defined accordingly.
- a PUSCH for an uplink grant transmitted in a specific downlink subframe black or a special subframe is transmitted in a subframe connected by an arrow, and a subframe indicated by hatching is uplink / downlink operated by an actual eNB.
- a discrepancy Between the Link Subframe Setup and the Representative Uplink / Downlink Subframe Setup Processing PUSCH Transmission Time There is a discrepancy.
- the broken arrows indicate the HARQ timeline in which the uplink grant does not actually need to be transmitted due to a mismatch between the actual uplink / downlink subframe configuration and the representative uplink / downlink subframe configuration.
- a similar principle may be applied to an operation of receiving a PHICH or a retransmission grant after PUSCH transmission.
- a downlink subframe or Only subframes configured as special subframes (i.e., only subframes corresponding to an intersection of downlink subframes of all uplink / downlink subframe configurations) are configured as downlink subframes (or special subframes).
- the uplink / downlink subframe configuration is set to the representative uplink / downlink subframe configuration, and the PHICH or retransmission grant is transmitted here.
- a subframe configured as an uplink subframe (that is, all uplink / downlinks that can be changed) may be used.
- the uplink / downlink subframe configuration in which the subframe corresponding to the union of the uplink subframes of the subframe configuration is configured as an uplink subframe is set as the representative uplink / downlink subframe configuration and the downlink determined accordingly.
- a PHICH or retransmission grant is transmitted.
- FIG. 9 illustrates a timeline in which a PHICH or retransmission grant is transmitted in an E—TDD system according to an embodiment of the present invention.
- FIG. 9 is in the same situation as FIG. 8.
- the eNB transmits a specific feature of uplink / downlink subframe configuration that can be changed in a specific component carrier using a higher layer signal such as RRC or a system information signal such as SIB. Can be.
- a higher layer signal such as RRC or a system information signal such as SIB.
- the eNB dynamically changes the uplink / downlink subframe configuration.
- the existing UE operates with regard to the uplink / downlink subframe configuration transmitted in the SIB as valid, but if the eNB is on the SIB If a subframe configured as a downlink subframe is dynamically changed to an uplink subframe, CRS measurement of an existing UE that is expected to transmit a cell specific reference signal (CRS) in a corresponding subframe may be severely distorted.
- CRS cell specific reference signal
- the eNB changes the uplink / downlink subframe configuration through dynamic signaling, it is allowed to convert a subframe configured as an uplink subframe on the SIB to a downlink subframe, while the downlink subframe is on the SIB. It may be prohibited to convert a subframe set as a frame (or a special subframe) into an uplink subframe. If this restriction is applied, the uplink / downlink subframe configuration configured on the SIB is considered as an uplink / downlink subframe configuration having the largest uplink subframe among the uplink / downlink subframe configuration that the eNB can configure. In another sense, it can be viewed as an uplink / downlink subframe configuration corresponding to the union of uplink subframes on the uplink / downlink subframe configuration that the eNB can configure.
- the HARQ timeline for the uplink transmission of the UE that is, the scheduling timing or PUSCH transmission of the PUSCH.
- Receiving a later PHICH or retransmission grant may be the same as following the uplink / downlink subframe configuration configured on the SIB.
- the timing of transmitting the HARQ timeline for the downlink transmission of the UE is preferably used other than the uplink / downlink subframe configuration set on the SIB.
- the eNB designates a specific uplink / downlink subframe configuration through an upper layer signal such as RRC and transmits an uplink ACK / NACK for the PDSCH, the timing of the uplink / downlink subframe configuration is separately indicated.
- the uplink / downlink subframe configuration separately indicated is an uplink that the eNB can select. It means that the uplink / downlink subframe configuration having an uplink subframe corresponding to the intersection of the uplink subframes of the / downlink subframe settings. Accordingly, the eNB is prohibited from configuring a subframe configured as an uplink subframe to be a downlink subframe on the separately indicated uplink / downlink subframe configuration, and the UE sets an error in this configuration. Can be considered and operate. Specifically, the uplink / downlink subframe configuration that can be configured by the eNB may mean that the following conditions 1) to 3) must be satisfied.
- a subframe configured as a downlink subframe on the SIB should also be a downlink subframe on the uplink / downlink subframe configuration used in the actual data channel transmission and reception.
- a subframe configured as a special subframe on the SIB may be limited to be a special subframe on the uplink / downlink subframe configuration used in the actual data channel transmission and reception. This is because the special subframe also transmits the CRS, so that the existing UEs attempt to measure the CRS suitable for the configuration of the special subframe.
- a subframe configured as an uplink subframe is an uplink / downlink subframe used in actual data channel transmission and reception. It should also be an uplink subframe in configuration.
- a subframe configured as an uplink subframe on the SIB but configured as a downlink subframe on the uplink / downlink subframe configuration separately indicated for the HARQ timeline for the downlink transmission is selected by the eNB. Accordingly, it may be configured as a downlink subframe or an uplink subframe on the uplink / downlink subframe configuration used in actual data channel transmission and reception.
- a method of signaling uplink / downlink subframe configuration to be used at every time point while satisfying the conditions of 1) to 3) may be illustrated as follows.
- the uplink / downlink subframe configuration and the uplink / downlink subframe configuration indicated by the SIB used in the actual data channel transmission and reception have the same special subframe positions.
- the resulting downlink-uplink switching period may be determined by uplink / downlink subframe configuration on the SIB.
- the uplink / downlink subframe configuration is classified according to each switching period, and sorted according to the number of downlink subframes, the result may be grouped as shown in Table 4 below. '
- the eNB notifies the UE of the index of Table 4 through a higher layer signal such as RRC or MAC, or a physical layer signal, so that an uplink / downlink subframe used in actual data channel transmission and reception. You can instruct the setting.
- a higher layer signal such as RRC or MAC, or a physical layer signal
- the minimum value of the signaled index may be designated by uplink / downlink subframe configuration on the SIB. For example, if the uplink / downlink subframe configuration # 6 is indicated on the SIB, the minimum index is # 1 and the index # 0 is unavailable.
- the maximum value of the signaled index may be designated by an uplink / downlink subframe configuration indicated for the HARQ timeline for downlink transmission. For example, if # 1 assigned uplink / downlink sub-frames setting the UL / DL subframe set to a 'HARQ timeline for the downlink transmission, the highest index will be that # 2 and index # 3 Is not available.
- the eNB signals the offset value from the minimum index specified by the uplink / downlink subframe configuration on the SIB, so that the uplink / downlink subframe used in the actual data channel transmission and reception. You can instruct the setting. For example, if uplink / downlink subframe configuration # 6 is indicated on the SIB, the minimum index is # 1, and if the eNB signals an index offset value of 1, the uplink / downlink corresponding to index # 2 Subframe configuration # 1 becomes the uplink / downlink subframe configuration actually used at the time.
- the uplink / downlink subframe configuration that can be changed as the range May be given. That is, a range of uplink / downlink subframe configuration that can be changed may be given based on uplink / downlink subframe configuration indicated in the SIB.
- Such a representative uplink / downlink subframe configuration is configured by using the representative uplink / downlink subframe settings of each component carrier, the representative uplink / downlink subframe configuration applied to all component carriers by applying the above-described method. Can be selected. Since only one uplink / downlink subframe configuration may exist in a component carrier to which E-TDD is not applied, this may be regarded as a representative uplink / downlink subframe configuration of the corresponding component carrier.
- the eNB When the eNB directly designates the representative uplink / downlink subframe configuration, especially for downlink HARQ, the eNB designates the representative uplink / downlink subframe configuration for each component carrier, and the representative uplink / downlink subframe configuration.
- the representative uplink / downlink subframe configuration may be selected according to a method of setting the representative uplink / downlink subframe.
- the configuration of uplink / downlink subframes that can be changed on all component carriers by enumerating all uplink / downlink subframe settings that can be changed for each component carrier, and by applying the above-described principle based on this It is also possible to select the uplink / downlink subframe configuration that represents the entire component carriers.
- the eNB directly designates the representative uplink / downlink subframe configuration, it is possible to specify the representative uplink / downlink subframe configuration to be used in a situation where all component carriers are combined, particularly for downlink HARQ.
- a representative uplink / downlink subframe configuration on all component carriers only component carriers that are directly involved in HARQ operation may be targeted, not all component carriers. For example, when selecting a representative uplink / downlink subframe configuration for the uplink ACK / NACK, If the uplink ACK / NACK is transmitted only to the PCell, only the PCell for transmitting the uplink ACK / NACK (that is, the main component carrier) and the scheduled cell for receiving the PDSCH (that is, the secondary component carrier) are considered. A representative uplink / downlink subframe configuration may be selected.
- a representative uplink / downlink subframe configuration for PUSCH scheduling timing or PHICH timing only cells transmitting the corresponding PUSCH and cells receiving the uplink grant or PHICH are considered.
- the representative uplink / downlink subframe configuration for the carrier aggregation scheme can be selected.
- the representative uplink / downlink subframe configuration for the uplink HARQ is a component for scheduling uplink of the corresponding component carrier. It may correspond to uplink / downlink subframe configuration configured on a system information message of a carrier.
- CC #X a component carrier on which an E-TDD operation is performed
- CC #X an uplink / downlink subframe configuration for a corresponding CC #X configured through SIB is set uplink / downlink sub Marked with frame setting #X.
- the operation of the present invention described below is applicable to the case where the eNB performs the E-TDD operation in one CC (for example, SCell) when the carrier aggregation technique is applied, and also the carrier aggregation technique It is also possible to operate the E-TDD on a single component carrier without applying.
- uplink ACK of CC #X Represent a representative uplink / downlink subframe configuration for / NACK transmission as uplink / downlink subframe configuration #X, and the corresponding uplink ACK / NACK transmission of the considered uplink / downlink subframe configuration #X It can be made according to the uplink ACK / NACK transmission timeline.
- the PUSCH transmission (black, PUSCH retransmission) timeline includes subframes corresponding to the union of uplink subframes in the uplink / downlink subframe configurations other than the uplink / downlink subframe configuration #X.
- the PUSCH is transmitted in CC #X.
- Representative uplink / downlink subframe configuration configured for (or PUSCH retransmission) is regarded as uplink / downlink subframe configuration #X, and the corresponding PUSCH transmission (black PUSCH retransmission) is uplink / downlink subframe You can follow the timeline of frame setting #X.
- the third method, (X #X the E-TDD operation performed is different from the component carrier defined in the pre-cross-carrier scheduling keuke (Cross Carrier Scheduling.
- the CC #X may be determined by a relationship between the representative uplink / downlink subframe configuration of the scheduling component carrier and the CC #X representative uplink / downlink subframe configuration.
- a timeline ie, final representative uplink / downlink subframe configuration for uplink ACK / NACK transmission or PUSCH transmission (or PUSCH retransmission) may be defined.
- the uplink / downlink subframe configuration configured through the SIB is the representative uplink / downlink subframe of the scheduling component carrier
- the uplink / downlink subframe configuration configured through the SIB is the representative uplink / downlink subframe of the scheduling component carrier
- a final representative uplink / downlink configured for uplink ACK / NACK transmission in CC #X may be set.
- the subframe configuration may be regarded as a representative uplink / downlink subframe configuration of the scheduling component carrier.
- the uplink ACK / NACK transmission in CC #X may be performed along the uplink ACK / NACK transmission timeline of the considered final representative uplink / downlink subframe configuration.
- the uplink subframe set of the representative uplink / downlink subframe configuration of the scheduling component carrier is CC #.
- the representative uplink / downlink subframe configuration of the component carrier in which case the corresponding PUSCH transmission (black is PUSCH retransmission) can be made along the timeline of the final representative uplink / downlink subframe configuration considered. have.
- the uplink subframe set of the representative uplink / downlink subframe configuration of the scheduling component carrier does not include the uplink subframe set of the representative uplink / downlink subframe configuration of CC #X.
- the final representative uplink / downlink subframe configuration configured for PUSCH transmission (or PUSCH retransmission) on CC #X may be regarded as the representative uplink / downlink subframe configuration of CC #X. Or PUSCH retransmission) may be performed along the timeline of the considered final representative uplink / downlink subframe configuration.
- a (downlink) subframe capable of PDSCH scheduling based on cross-carrier scheduling on cc #x from a scheduling component carrier may include a representative uplink / downlink subframe configuration of a scheduling component carrier and a representative uplink of CC #X. In the / downlink subframe configuration, all can be limited to a subframe designated for downlink purposes.
- the scheduling component carrier such as PCell
- the uplink / downlink subframe configuration configured through the SIB is set to the representative uplink / downlink subframe configuration of the scheduling component carrier Of course it can be.
- a (downlink) subframe capable of PDSCH scheduling based on cross-carrier scheduling on X #X from a scheduling component carrier may include a representative uplink / downlink subframe configuration of a scheduling component carrier and CC #X. While the representative uplink / downlink subframe configuration is a subframe point designated for downlink use, the final representative uplink / downlink subframe configuration for uplink ACK / NACK transmission on CC #X derived by the third method is used.
- the uplink ACK / NACK transmission time point may be limited to subframes that simultaneously satisfy the condition of a defined downlink subframe.
- FIG. 10 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the communication apparatus 1000 includes a processor 1010, a memory 1020, an RF module 1030, a display module 1040, and a user interface module 1050.
- the communication device 1000 is shown for convenience of description and some models may be omitted.
- the communication apparatus 1000 may further include necessary modules.
- some modules in the communication device 1000 may be divided into more granular modules.
- the processor 1010 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 1010 may refer to the contents described with reference to FIGS. 1 to 9.
- the memory 1020 is connected to the processor 1010 and stores an operating system, an application, a program code, data, and the like.
- the RF modules 1030 are connected to the processor 1010 and convert the baseband signals into radio signals or convert radio signals. Converts to baseband signal. To this end, the RF module 1030 performs analog conversion amplification, filtering and frequency upconversion or their reverse processes. To perform.
- the display modules 1040 are connected to the processor 1010 and display various information.
- the display module 1040 may use well-known elements such as, but not limited to, a liquid crystal display (LCD), a light emitting diode (LED), and an organic light emitting diode (0LED).
- the user interface modules 1050 are connected to the processor 1010 and can be configured with a combination of well known user interfaces such as a keypad, touch screen, and the like.
- an embodiment according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more ASICs (ap 1 i cat ion specific integrated circuits), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs). ), Programmable programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs ap 1 i cat ion specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs Programmable programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, a procedure function, or the like for performing the functions or operations described above.
- the software code may be stored in a memory unit and driven by a processor.
- the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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EP13784987.3A EP2863571B1 (en) | 2012-05-03 | 2013-05-02 | Method and apparatus for performing harq based on dynamic change of wireless resources in wireless communication system |
JP2015510185A JP6117913B2 (ja) | 2012-05-03 | 2013-05-02 | 無線通信システムにおいて無線リソース動的変更に基づくharq実行方法及びそのための装置 |
US14/398,668 US20150092629A1 (en) | 2012-05-03 | 2013-05-02 | Method and apparatus for performing harq based on dynamic change of wireless resources in wireless communication system |
CN201380029349.1A CN104365051B (zh) | 2012-05-03 | 2013-05-02 | 在无线通信系统中基于无线资源的动态变化执行harq的方法和装置 |
KR1020147033876A KR20150017721A (ko) | 2012-05-03 | 2013-05-02 | 무선 통신 시스템에서 무선 자원 동적 변경에 기반한 harq 수행 방법 및 이를 위한 장치 |
ES13784987T ES2777180T3 (es) | 2012-05-03 | 2013-05-02 | Método y aparato para realizar HARQ basado en el cambio dinámico de recursos inalámbricos en el sistema de comunicaciones inalámbricas |
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US9515808B2 (en) * | 2011-07-26 | 2016-12-06 | Qualcomm Incorporated | Transmission of control information in a wireless network with carrier aggregation |
SG11201510180XA (en) * | 2013-06-19 | 2016-01-28 | Nokia Solutions & Networks Oy | Methods, apparatuses, and computer program products for providing dynamic uplink-downlink reconfiguration information to user equipments |
US9560649B1 (en) * | 2014-03-13 | 2017-01-31 | Sprint Spectrum L.P. | Method of allocating communication resources to a wireless device in a wireless communication network |
BR112017003000A2 (pt) | 2014-08-15 | 2017-12-12 | Interdigital Patent Holdings Inc | melhoria de cobertura para a duplexação por divisão de tempo e mitigação melhorada de interferência e adaptação de tráfego em sistemas de evolução em longo prazo e unidade de transmissão/recepção sem fio |
EP3297320B1 (en) | 2015-06-10 | 2019-08-14 | Huawei Technologies Co., Ltd. | Method for sending or receiving information, user equipment and base station |
EP3734880B1 (en) * | 2017-12-28 | 2022-11-16 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and device for transmitting hybrid automatic repeat request information |
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- 2013-05-02 EP EP13784987.3A patent/EP2863571B1/en active Active
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EP2863571A4 (en) | 2015-06-03 |
JP6117913B2 (ja) | 2017-04-19 |
EP2863571B1 (en) | 2020-02-12 |
JP2015523758A (ja) | 2015-08-13 |
EP2863571A1 (en) | 2015-04-22 |
KR20150017721A (ko) | 2015-02-17 |
ES2777180T3 (es) | 2020-08-04 |
CN104365051B (zh) | 2018-06-15 |
US20150092629A1 (en) | 2015-04-02 |
CN104365051A (zh) | 2015-02-18 |
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