WO2012134107A2 - 무선 통신 시스템에서 통신 방법 및 장치 - Google Patents
무선 통신 시스템에서 통신 방법 및 장치 Download PDFInfo
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- WO2012134107A2 WO2012134107A2 PCT/KR2012/002098 KR2012002098W WO2012134107A2 WO 2012134107 A2 WO2012134107 A2 WO 2012134107A2 KR 2012002098 W KR2012002098 W KR 2012002098W WO 2012134107 A2 WO2012134107 A2 WO 2012134107A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
-
- 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
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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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
- 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
- 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) or DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
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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—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0096—Indication of changes in allocation
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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
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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
- H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
Definitions
- the present invention relates to wireless communication, and more particularly, to a communication method and apparatus in a wireless communication system in which downlink-uplink configuration is changed.
- LTE Long term evolution
- 3GPP 3rd Generation Partnership Project
- TS Technical Specification
- the physical channel in LTE is a downlink channel PDSCH (Physical Downlink) It may be divided into a shared channel (PDCCH), a physical downlink control channel (PDCCH), a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) which are uplink channels.
- PDSCH Physical Downlink
- PUSCH physical uplink shared channel
- PUCCH physical uplink control channel
- 3GPP LTE supports both Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
- FDD Frequency Division Duplex
- UL (downlink) transmission and DL (downlink) transmission use different frequencies
- TDD Time Division Duplex
- UL transmission and DL transmission use the same frequency.
- a terminal supporting full duplex-FDD can simultaneously perform UL transmission and DL reception at a specific time.
- a terminal supporting half duplex-FDD and TDD can perform UL transmission and DL reception at different times.
- a DL subframe and a UL subframe coexist in one radio frame.
- the designation of the positions of the DL subframe and the UL subframe in the radio frame is called UL-DL configuration.
- wireless communication systems have been designed in consideration of little change if the base station uses a specific UL-DL configuration. This is because normal communication may be difficult when a mismatch occurs between the terminal and the base station for the UL-DL configuration.
- the base station needs to change the UL-DL configuration more flexibly.
- An object of the present invention is to provide a communication method and a wireless device using the same in the process of changing the UL-DL configuration.
- a communication method in a wireless communication system is configured to communicate with a base station by applying a first downlink (DL) -UL (uplink) configuration that sets a plurality of downlink subframes and a plurality of uplink subframes at different times.
- DL downlink
- uplink uplink
- the at least one auxiliary subframe may include at least one DL subframe common to the first UL-DL configuration and the second UL-DL configuration.
- the at least one auxiliary subframe may include at least one UL subframe common to the first UL-DL configuration and the second UL-DL configuration.
- the at least one auxiliary subframe may be used for a predetermined time until the second UL-DL configuration is applied.
- the wireless communication system may be a time division duplex (TDD) system.
- TDD time division duplex
- the wireless communication system may be a half duplex-FDD (Frequency Division Duplex) system.
- FDD Frequency Division Duplex
- a wireless device in a wireless communication system includes a radio frequency (RF) unit for transmitting and receiving a radio signal, and a processor coupled to the RF unit, wherein the processor is configured to perform a plurality of downlink subframes at different times;
- RF radio frequency
- the processor is configured to perform a plurality of downlink subframes at different times;
- a base station By communicating with a base station by applying a first downlink (DL) -uplink (UL) configuration for configuring a plurality of uplink subframes, and receiving a second UL-DL configuration from the base station, at least one auxiliary subframe is generated.
- DL downlink
- UL uplink
- 1 shows a structure of a downlink radio frame in 3GPP LTE.
- FIG. 2 shows a structure of an uplink subframe in 3GPP LTE.
- 3 shows UL synchronous HARQ in 3GPP LTE.
- FIG. 5 shows an example of a multi-carrier.
- FIG. 6 is a flowchart illustrating a communication method according to an embodiment of the present invention.
- FIG. 8 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- the user equipment may be fixed or mobile, and may include a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a personal digital assistant (PDA). It may be called other terms such as digital assistant, wireless modem, handheld device.
- MS mobile station
- MT mobile terminal
- UT user terminal
- SS subscriber station
- PDA personal digital assistant
- a base station generally refers to a fixed station communicating with a terminal, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.
- eNB evolved-NodeB
- BTS base transceiver system
- access point an access point
- 3GPP LTE shows a structure of a downlink radio frame in 3GPP LTE. This can be referred to in section 4 of 3GPP TS 36.211 V8.7.0 (2009-05) "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)", for TDD (Time Division Duplex) will be..
- 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.
- a subframe having indexes # 1 and # 6 is called a special subframe and includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
- DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
- UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
- GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
- DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe coexist in one radio frame.
- Table 1 shows an example of configuration of a radio frame.
- 'D' represents a DL subframe
- 'U' represents a UL subframe
- 'S' represents a special subframe.
- the terminal may know which subframe is the DL subframe or the UL subframe according to the configuration of the radio frame.
- the DL (downlink) subframe is divided into a control region and a data region in the time domain.
- the control region includes up to three OFDM symbols preceding the first slot in the subframe, but the number of OFDM symbols included in the control region may be changed.
- PDCCH and other control channels are allocated to the control region, and PDSCH is allocated to the data region.
- a physical channel is a physical downlink shared channel (PDSCH), a physical downlink shared channel (PUSCH), a physical downlink control channel (PDCCH), and a physical channel (PCFICH). It may be divided into a Control Format Indicator Channel (PHICH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and a Physical Uplink Control Channel (PUCCH).
- PDSCH physical downlink shared channel
- PUSCH physical downlink shared channel
- PDCCH physical downlink control channel
- PCFICH physical 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 terminal 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 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 terminal 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
- 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 terminal, attaches a cyclic redundancy check (CRC) to the DCI, and unique identifier according to the owner or purpose of the PDCCH (this is called a radio network temporary identifier (RNTI)). Mask to the CRC.
- CRC cyclic redundancy check
- RNTI radio network temporary identifier
- FIG. 2 shows a structure of an uplink subframe in 3GPP LTE.
- the uplink subframe may be divided into a control region in which a physical uplink control channel (PUCCH) carrying uplink control information is allocated in a frequency domain and a data region in which a physical uplink shared channel (PUSCH) carrying user data is allocated.
- PUCCH physical uplink control channel
- PUSCH physical uplink shared channel
- PUCCH is allocated to an RB pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the first slot and the second slot.
- m is a position index indicating a logical frequency domain position of an RB pair allocated to a PUCCH in a subframe. It is shown that an RB having the same m value occupies different subcarriers in two slots.
- PUCCH supports multiple formats.
- a PUCCH having a different number of bits per subframe may be used according to a modulation scheme dependent on the PUCCH format.
- PUCCH format 1 is used for transmission of SR (Scheduling Request)
- PUCCH format 1a / 1b is used for transmission of ACK / NACK signal for HARQ
- PUCCH format 2 is used for transmission of CQI
- PUCCH format 2a / 2b is used for CQI and Used for simultaneous transmission of ACK / NACK signals.
- PUCCH format 1a / 1b is used when transmitting only the ACK / NACK signal in the subframe
- PUCCH format 1 is used when the SR is transmitted alone.
- PUCCH format 1 is used, and an ACK / NACK signal is modulated and transmitted on a resource allocated to the SR.
- the terminal In order to receive the downlink data, the terminal first receives a DL resource allocation (or DL grant) on the PDCCH. Upon successful detection of the PDCCH, the UE reads the DCI on the PDCCH. Receives downlink data on the PDSCH using DL resource allocation in the DCI. In addition, in order to transmit the uplink data, the terminal first receives a UL resource allocation (or UL grant) on the PDCCH. Upon successful detection of the PDCCH, the UE reads the DCI on the PDCCH. UL data is transmitted on the PUSCH using uplink resource allocation in the DCI.
- a DL resource allocation or DL grant
- 3GPP LTE uses synchronous HARQ in UL transmission and asynchronous HARQ in DL 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.
- 3 shows UL synchronous HARQ in 3GPP LTE.
- the terminal receives an initial UL grant on the PDCCH 310 in the nth subframe from the base station.
- the terminal 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, and 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.
- the terminal receiving the NACK signal transmits a retransmission block on the PUSCH 340 in the n + 12th subframe.
- the UE uses the received retransmission UL grant upon receiving the retransmission UL grant on the PDCCH 332, and uses the initial UL grant 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.
- Eight HARQ processes may be performed in FDD of 3GPP LTE, and each HARQ process is indexed from 0 to 7.
- the number of HARQ processes is determined as shown in the following table according to the UL-DL configuration of Table 1.
- k For TDD UL-DL configuration 1-6 and normal HARQ operation, if a PDCCH and / or PHICH transmission having a UL grant is detected in subframe n, the UE performs a corresponding PUSCH transmission in subframe n + k. do. k is given by the following table.
- ACK / NACK carried by PHICH received in subframe i is associated with PUSCH transmission in subframe i-4.
- ACK / NACK carried by PHICH received in subframe i is associated with PUSCH transmission in subframe i-k.
- k is given by the following table.
- the UE For the PUSCH transmission scheduled in subframe n, the UE receives the PHICH in subframe n + k PHICH .
- k PHICH In FDD, k PHICH is always 4, and in TDD, k PHICH is given by the following table.
- the UE identifies a PHICH resource 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 indicates a cyclic shift of a DMRS (demodulation refernence signal) in the most recent UL grant for the transport block associated with the 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. Number of PHICH Groups N group PHICH is a parameter set by higher layer signaling.
- 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 UE monitors the PDCCH and receives a DL resource allocation (or DL grant) on the PDCCH 501 in the nth DL subframe.
- the terminal receives a DL transport block through the PDSCH 502 indicated by the DL resource allocation.
- the UE transmits an ACK / NACK signal for the DL transport block on the PUCCH 511 in the n + 4th UL subframe.
- the ACK / NACK signal may be referred to as a reception acknowledgment for the DL transport block.
- the ACK / NACK signal becomes an ACK signal when the DL transport block is successfully decoded, and becomes an NACK signal when the decoding of the DL transport block fails.
- the base station may perform retransmission of the DL transport block until the ACK signal is received or up to a maximum number of retransmissions.
- the UE uses resource allocation of the PDCCH 501.
- PUCCH resources are determined based on the lowest CCE index (or index of the first CCE) used for transmission of the PDCCH 501.
- the index used to determine the PUCCH resource is called a resource index.
- an uplink subframe and a downlink subframe coexist in one radio frame.
- the number of uplink subframes is less than the number of downlink subframes. Therefore, there is a lack of an uplink subframe for transmitting the ACK / NACK signal, it is supported to transmit a plurality of ACK / NACK signals for a plurality of downlink transport blocks in one uplink subframe.
- section 10.1 of 3GPP TS 36.213 V8.7.0 2009-05
- two ACK / NACK modes of channel selection and bundling are started.
- bundling is to transmit an ACK when all of the decoding of the PDSCH (ie, downlink transport blocks) received by the UE is successful, and otherwise, transmit an NACK.
- channel selection is also referred to as ACK / NACK multiplexing.
- the terminal selects one PUCCH resource among a plurality of PUCCH resources and transmits ACK / NACK.
- the following table shows DL subframe n-k associated with UL subframe n according to UL-DL configuration in 3GPP LTE, where k ⁇ K and M represent the number of elements of set K.
- UL subframe 2 may be ⁇ 13, 12, 9, 8, 7, 5, 4, 11, 6 ⁇ , 9 DL subframes are connected.
- the 3GPP LTE system supports a case where the downlink bandwidth and the uplink bandwidth are set differently, but this assumes one component carrier (CC).
- the 3GPP LTE system supports up to 20MHz and may have different uplink and downlink bandwidths, but only one CC is supported for each of the uplink and the downlink.
- Spectrum aggregation supports a plurality of CCs. For example, if five CCs are allocated as granularity in a carrier unit having a 20 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.
- One DL CC or a pair of UL CC and DL CC may correspond to one cell. Accordingly, it can be said that a terminal communicating with a base station through a plurality of DL CCs receives a service from a plurality of serving cells.
- FIG. 5 shows an example of a multi-carrier.
- the number of DL CCs and UL CCs is not limited.
- PDCCH and PDSCH are independently transmitted in each DL CC, and PUCCH and PUSCH are independently transmitted in each UL CC. Since three DL CC-UL CC pairs are defined, the UE may be provided with services from three serving cells.
- the UE may monitor the PDCCH in the plurality of DL CCs and receive DL transport blocks simultaneously through the plurality of DL CCs.
- the terminal may transmit a plurality of UL transport blocks simultaneously through the plurality of UL CCs.
- Each serving cell may be identified through a cell index (CI).
- the CI may be unique within the cell or may be terminal-specific.
- CI 0, 1, 2 is assigned to the first to third serving cells is shown.
- the serving cell may be divided into a primary cell and a secondary cell.
- the primary cell is a cell that operates at the primary frequency and performs an initial connection establishment process, which is a terminal, 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, can be established after the RRC connection is established, and can be used to provide additional radio resources. At least one primary cell is always configured, and the secondary cell may be added / modified / released by higher layer signaling (eg, RRC message).
- the CI of the primary cell can 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.
- UL-DL configuration is repeated in a specific time unit in a TDD system.
- the UL-DL configuration may be configured to be repeated in units of radio frames.
- the network may change the UL-DL configuration according to traffic conditions or interference environment changes.
- the DL HARQ timing, the UL HARQ timing, etc. are changed according to the UL-DL configuration.
- the new UL-DL configuration is changed in the preset UL-DL configuration, a mismatch of the UL-DL configuration may occur between the base station and the terminal.
- the base station sends a new UL-DL configuration, there may be a period in which the terminal does not apply the new UL-DL configuration.
- FIG. 6 is a flowchart illustrating a communication method according to an embodiment of the present invention.
- step S610 the base station sends a first UL-DL configuration to the terminal, the terminal communicates with the base station by applying the first UL-DL configuration.
- step S620 the base station determines whether to change the UL-DL configuration.
- the base station may change the UL-DL configuration according to traffic conditions or changes in the interference environment.
- step S630 the base station sends a second UL-DL configuration to the terminal.
- the second UL-DL configuration is a UL-DL configuration that overrides the first UL-DL configuration.
- the second UL-DL configuration may be received through system information.
- the second UL-DL configuration may be received through at least one of an RRC message, a MAC message, and a physical channel.
- the second UL-DL configuration may be received through a message for activating or deactivating the secondary cell.
- step S640 the terminal communicates with the base station using an auxiliary subframe before applying the second UL-DL configuration.
- the auxiliary subframe includes a DL subframe and / or a UL subframe temporarily used when receiving a new UL-DL configuration that overrides the existing UL-DL configuration.
- the auxiliary subframe may be used while the timer is running.
- the timer is started upon receiving the second UL-DL configuration.
- the reset period ends and the second UL-DL configuration is applied.
- the timer value may be predefined or the base station may inform the terminal.
- step S650 the terminal communicates with the base station by applying the second UL-DL configuration.
- the auxiliary subframe may include a DL subframe and / or a UL subframe common in the first UL-DL configuration and the second UL-DL configuration. At least one of subframes that are DL subframes in common in both the first UL-DL configuration and the second UL-DL configuration may be designated as an auxiliary subframe. At least one of subframes that are UL subframes may be designated as an auxiliary subframe in both the first UL-DL configuration and the second UL-DL configuration. For example, assume that the first UL-DL configuration is UL-DL configuration 1 of Table 1 and the second UL-DL configuration is UL-DL configuration 2 of Table 1.
- the auxiliary subframe may include at least one of subframes 0, 5, and 9, which are common DL subframes, and at least one of subframes 2 and 7, which are common UL subframes.
- the terminal and the base station may transmit or receive data and control information through an auxiliary subframe.
- the UE may ignore PDSCH / PUSCH scheduling, PDSCH / PUSCH retransmission, PHICH reception, and UL ACK / NACK transmission for a subframe other than the auxiliary subframe during the resetting period.
- the auxiliary subframe may be used for receiving system information, broadcast information, and control information, and transmission of PUSCH / PUCCH used for transmission of UE specific data may be limited.
- the secondary subframe may include only the DL subframe.
- UL ACK / NACK may be transmitted according to the PDSCH received through the auxiliary DL subframe.
- the PUSCH may be transmitted according to the UL grant received on the secondary DL subframe.
- the secondary subframe may include only the UL subframe.
- the base station may schedule DL PDSCH / PDCCH transmission according to UL ACK / NACK and / or PUSCH transmission timing of the secondary UL subframe.
- DL / UL subframes common to all UL-DL configurations may be defined as auxiliary subframes.
- auxiliary subframes For example, in Table 1, subframes 0 and 5 are DL subframes in all UL-DL configurations, and subframe 2 is a UL subframe in all UL-DL configurations.
- the auxiliary subframe may include at least one of subframes 0, 2, and 5.
- the UL-DL configurations may be divided into a plurality of groups, and an auxiliary subframe may be defined for each group.
- Table 1 the first group (UL-DL configuration 0, 1, 2, 6) having a switching point period of 5 ms and the second group (UL-DL configuration 3, 4, 5) having a switching point period of 10 ms are shown in Table 1.
- the DL / UL subframe common to each group may be defined as an auxiliary subframe.
- the auxiliary subframe may include at least one of subframes 0, 2, 5, and 7.
- the auxiliary subframe may include at least one of subframes 0, 2, 5, 6, 7, and 8.
- the secondary subframe may be set by the base station.
- Information regarding the subframe may be included in the message including the second UL-DL configuration.
- the auxiliary subframe may include at least one of subframes 2 and 6 upon resetting between UL-DL configuration 0 and 1.
- the DL / UL state is unclear for subframes other than the auxiliary DL subframes during the resetting period in which communication is performed using the auxiliary subframes, so that the UE is in DL channel state information (DL CSI) or radio link quality (radio link quality). It is unclear whether quality) can be measured. Restrictions may be applied not to measure the DL channel state for subframes other than the auxiliary DL subframes.
- DL CSI DL channel state information
- radio link quality radio link quality
- Some functions may be limited for subframes other than the auxiliary DL subframe.
- a semi-persistent scheduling (SPS) PDSCH may not be transmitted in a subframe other than the auxiliary DL subframe. Even if the SPS PDSCH is transmitted, retransmission for the SPS PDSCH may not be performed. Alternatively, retransmissions may be restricted to only secondary DL subframes.
- SPS semi-persistent scheduling
- a CSI may not be reported in a subframe other than the auxiliary UL subframe or a SRS (sounding reference signal) may be restricted.
- the SPS PUSCH may not be transmitted in a subframe other than the auxiliary UL subframe. Even if the SPS PUSCH is transmitted, retransmission for the SPS PUSCH may not be performed. Or, retransmissions may be restricted to only secondary UL subframes.
- DL channel status reporting and / or SRS transmission may be prohibited during the resetting period.
- auxiliary subframe between the first DL-UL configuration and the second DL-UL configuration
- DL transmission or UL transmission only in a DL subframe and / or an UL subframe corresponding to the auxiliary subframe This fixed, other subframe may be used according to the scheduling of the base station.
- UL subframe 2 and DL subframe 6 are configured as auxiliary subframes.
- Secondary UL subframe 2 is capable of only UL transmission
- auxiliary DL subframe 6 is capable of DL transmission only.
- subframe 0 which is not an auxiliary subframe
- a base station may arbitrarily schedule UL transmission or DL transmission.
- DL subframe 0 and DL subframe 5 are configured as auxiliary subframes.
- Secondary DL subframes 0 and 5 are capable of DL transmission only, and subframes other than the secondary subframe may be arbitrarily scheduled by the base station for UL transmission or DL transmission.
- the present invention can be applied to various systems in which DL transmission and UL transmission are performed at different times.
- Half-FDD Frequency Division Duplex
- Half-FDD uses different frequencies for UL transmission and DL transmission, but UL transmission and DL reception are not possible at the same time.
- UL-DL configuration may be defined, and the proposed auxiliary subframe may be applied during the resetting period.
- MTC machine-Type Communication
- MTC is a form of data communication that includes one or more entities that do not require human interaction. That is, MTC refers to a concept in which a mechanical device, not a terminal used by humans, communicates using an existing wireless communication network. Mechanical devices used in the MTC may be referred to as MTC devices, and various MTC devices include vending machines and machines for measuring the water level of dams.
- FIG. 8 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 50 includes a processor 51, a memory 52, and an RF unit 53.
- the memory 52 is connected to the processor 51 and stores various information for driving the processor 51.
- the RF unit 53 is connected to the processor 51 and transmits and / or receives a radio signal.
- the processor 51 implements the proposed functions, processes and / or methods, and the operation of the base station 50 in the above-described embodiment of FIG. 6 may be implemented by the processor 51.
- the processor 51 manages the UL-DL configuration and may change the UL-DL configuration as necessary.
- the wireless device 60 includes a processor 61, a memory 62, and an RF unit 63.
- the memory 62 is connected to the processor 61 and stores various information for driving the processor 61.
- the RF unit 63 is connected to the processor 61 and transmits and / or receives a radio signal.
- the processor 61 implements the proposed function, process and / or method, and the operation of the terminal in the above-described embodiment of FIG. 6 may be implemented by the processor 61.
- the processor 61 communicates with the base station 50 by applying the UL-DL configuration, and sets the auxiliary subframe during the reset period.
- the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
- the RF unit may include a baseband circuit for processing 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 memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by various well known means.
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Abstract
Description
| UL-DL 설정 | 스위치 포인트 주기(Switch-point periodicity) | 서브프레임 인덱스 | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
| 0 | 5 ms | D | S | U | U | U | D | S | U | U | U |
| 1 | 5 ms | D | S | U | U | D | D | S | U | U | D |
| 2 | 5 ms | D | S | U | D | D | D | S | U | D | D |
| 3 | 10 ms | D | S | U | U | U | D | D | D | D | D |
| 4 | 10 ms | D | S | U | U | D | D | D | D | D | D |
| 5 | 10 ms | D | S | U | D | D | D | D | D | D | D |
| 6 | 5 ms | D | S | U | U | U | D | S | U | U | D |
| TDD UL-DL 설정 | 정규 HARQ 동작을 위한 HARQ 프로세스의 개수 | 서브프레임 번들링 동작을 위한 HARQ 프로세스의 개수 |
| 0 | 7 | 3 |
| 1 | 4 | 2 |
| 2 | 2 | N/A |
| 3 | 3 | N/A |
| 4 | 2 | N/A |
| 5 | 1 | N/A |
| 6 | 6 | 3 |
| UL-DL 설정 | DL 서브프레임 번호 n | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| 0 | 4 | 6 | 4 | 6 | ||||||
| 1 | 6 | 4 | 6 | 4 | ||||||
| 2 | 4 | 4 | ||||||||
| 3 | 4 | 4 | 4 | |||||||
| 4 | 4 | 4 | ||||||||
| 5 | 4 | |||||||||
| 6 | 7 | 7 | 7 | 7 | 5 | |||||
| UL-DL 설정 | DL 서브프레임 번호 i | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| 0 | 7 | 4 | 7 | 4 | ||||||
| 1 | 4 | 6 | 4 | 6 | ||||||
| 2 | 6 | 6 | ||||||||
| 3 | 6 | 6 | 6 | |||||||
| 4 | 6 | 6 | ||||||||
| 5 | 6 | |||||||||
| 6 | 6 | 4 | 7 | 4 | 6 | |||||
| UL-DL 설정 | DL 서브프레임 번호 n | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| 0 | 4 | 7 | 6 | 4 | 7 | 6 | ||||
| 1 | 4 | 6 | 4 | 6 | ||||||
| 2 | 6 | 6 | ||||||||
| 3 | 6 | 6 | 6 | |||||||
| 4 | 6 | 6 | ||||||||
| 5 | 6 | |||||||||
| 6 | 4 | 6 | 6 | 4 | 7 | |||||
| UL-DL설정 | 서브프레임 n | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | |
| 0 | - | - | 6 | - | 4 | - | - | 6 | - | 4 |
| 1 | - | - | 7,6 | 4 | - | - | - | 7,6 | 4 | - |
| 2 | - | - | 8,7,4,6 | - | - | - | - | 8,7,4,6 | - | - |
| 3 | - | - | 7,6,11 | 6,5 | 5,4 | - | - | - | - | - |
| 4 | - | - | 12,8,7,11 | 6,5,4,7 | - | - | - | - | - | - |
| 5 | - | - | 13,12,9,8,7,5,4,11,6 | - | - | - | - | - | - | - |
| 6 | - | - | 7 | 7 | 5 | - | - | 7 | 7 | - |
Claims (15)
- 무선 통신 시스템에서 통신 방법에 있어서,서로 다른 시간에 복수의 하향링크 서브프레임과 복수의 상향링크 서브프레임을 설정하는 제1 DL(downlink)-UL(uplink) 설정을 적용하여 기지국과 통신하는 단계;상기 기지국으로부터 제2 UL-DL 설정을 수신함에 따라, 적어도 하나의 보조 서브프레임을 이용하여 상기 기지국과 통신하는 단계; 및상기 제2 UL-DL 설정을 적용하여 상기 기지국과 통신하는 단계를 포함하는 통신 방법.
- 제 1 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 상기 제1 UL-DL 설정과 상기 제2 UL-DL 설정에서 공통되는 적어도 하나의 DL 서브프레임을 포함하는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 상기 제1 UL-DL 설정과 상기 제2 UL-DL 설정에서 공통되는 적어도 하나의 UL 서브프레임을 포함하는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 미리 지정되는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 적어도 하나의 보조 서브프레임에 관한 정보는 기지국으로부터 수신되는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 제2 UL-DL 설정이 적용되기 전까지 상기 적어도 하나의 보조 서브프레임은 일정 시간 동안 이용되는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 타이머가 동작 중인 동안 이용되고, 상기 타이머는 상기 제2 UL-DL 설정을 수신함에 따라 개시되는 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 무선 통신 시스템은 TDD(Time Division Duplex) 시스템인 것을 특징으로 하는 통신 방법.
- 제 1 항에 있어서, 상기 무선 통신 시스템은 반이중(half duplex)-FDD(Frequency Division Duplex) 시스템인 것을 특징으로 하는 통신 방법.
- 무선 통신 시스템에서 무선 장치에 있어서,무선 신호를 송신 및 수신하는 RF(radio frequency)부;상기 RF부와 연결되는 프로세서를 포함하되, 상기 프로세서는서로 다른 시간에 복수의 하향링크 서브프레임과 복수의 상향링크 서브프레임을 설정하는 제1 DL(downlink)-UL(uplink) 설정을 적용하여 기지국과 통신하고;상기 기지국으로부터 제2 UL-DL 설정을 수신함에 따라, 적어도 하나의 보조 서브프레임을 이용하여 상기 기지국과 통신하고; 및상기 제2 UL-DL 설정을 적용하여 상기 기지국과 통신하는 무선 장치.
- 제 10 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 상기 제1 UL-DL 설정과 상기 제2 UL-DL 설정에서 공통되는 적어도 하나의 DL 서브프레임을 포함하는 것을 특징으로 하는 무선 장치.
- 제 10 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 상기 제1 UL-DL 설정과 상기 제2 UL-DL 설정에서 공통되는 적어도 하나의 UL 서브프레임을 포함하는 것을 특징으로 하는 무선 장치.
- 제 10 항에 있어서, 상기 적어도 하나의 보조 서브프레임은 미리 지정되는 것을 특징으로 하는 무선 장치.
- 제 10 항에 있어서, 상기 제2 UL-DL 설정이 적용되기 전까지 상기 적어도 하나의 보조 서브프레임은 일정 시간 동안 이용되는 것을 특징으로 하는 무선 장치.
- 제 10 항에 있어서, 상기 무선 장치는 TDD(Time Division Duplex) 또는 반이중(half duplex)-FDD(Frequency Division Duplex)를 지원하는 것을 특징으로 하는 무선 장치.
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| KR20100139062A (ko) * | 2008-03-24 | 2010-12-31 | 지티이 (유에스에이) 인크. | Lte/τdd 시스템에서의 다운링크/업링크 할당 비율의 동적 조정 및 시그널링 |
| CN102204154B (zh) * | 2008-10-31 | 2014-05-21 | 诺基亚公司 | 在基于分组的无线通信系统中用于时分双工操作的子帧调度的动态分配 |
| US20110176461A1 (en) * | 2009-12-23 | 2011-07-21 | Telefonakatiebolaget Lm Ericsson (Publ) | Determining configuration of subframes in a radio communications system |
| EP2679068B1 (en) * | 2011-02-21 | 2017-04-05 | Broadcom Corporation | Dynamic uplink/downlink configuration for time division duplex |
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2012
- 2012-03-23 KR KR1020137009565A patent/KR101517310B1/ko not_active Expired - Fee Related
- 2012-03-23 WO PCT/KR2012/002098 patent/WO2012134107A2/ko not_active Ceased
- 2012-03-23 CN CN201280003640.7A patent/CN103201968B/zh not_active Expired - Fee Related
- 2012-03-23 US US13/881,351 patent/US9155079B2/en not_active Expired - Fee Related
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| CN104885389B (zh) * | 2013-01-17 | 2018-05-11 | 英特尔Ip公司 | 用于时分双工(tdd)传输的上行链路(ul)和下行链路(dl)帧资源的动态配置 |
| US11139932B2 (en) | 2013-01-17 | 2021-10-05 | Apple Inc. | Dynamic configuration of uplink (UL) and downlink (DL) frame resources for a time division duplex (TDD) transmission |
| CN104885389A (zh) * | 2013-01-17 | 2015-09-02 | 英特尔Ip公司 | 用于时分双工(tdd)传输的上行链路(ul)和下行链路(dl)帧资源的动态配置 |
| US10582528B2 (en) | 2013-01-17 | 2020-03-03 | Apple Inc. | Dynamic configuration of uplink (UL) and downlink (DL) frame resources for a time division duplex (TDD) transmission |
| US9860912B2 (en) | 2013-01-17 | 2018-01-02 | Intel IP Corporation | Dynamic configuration of uplink (UL) and downlink (DL) frame resources for a time division duplex (TDD) transmission |
| US10129903B2 (en) | 2013-01-17 | 2018-11-13 | Intel IP Corporation | Dynamic configuration of uplink (UL) and downlink (DL) frame resources for a time division duplex (TDD) transmission |
| CN104969606A (zh) * | 2013-02-06 | 2015-10-07 | 索尼公司 | 通信控制设备、通信控制方法以及终端设备 |
| CN104969606B (zh) * | 2013-02-06 | 2019-03-05 | 索尼公司 | 通信控制设备、通信控制方法以及终端设备 |
| EP2955957A4 (en) * | 2013-02-06 | 2016-10-26 | Sony Corp | COMMUNICATION CONTROL, COMMUNICATION CONTROL METHOD AND DEVICE DEVICE |
| US9893870B2 (en) | 2013-02-06 | 2018-02-13 | Sony Corporation | Communication control device to control automatic repeat request processes |
| WO2014142585A1 (en) * | 2013-03-13 | 2014-09-18 | Samsung Electronics Co., Ltd. | Transmission of sounding reference signals for adaptively configured tdd communication systems |
| US9300451B2 (en) | 2013-03-13 | 2016-03-29 | Samsung Electronics Co., Ltd. | Transmission of sounding reference signals for adaptively configured TDD communication systems |
| EP2983320A4 (en) * | 2013-04-01 | 2016-03-23 | China Academy Of Telecomm Tech | COMMUNICATION METHOD AND DEVICE |
| US10219251B2 (en) | 2013-04-01 | 2019-02-26 | China Academy Of Telecommunications Technology | Method and device for communication |
| JP2016515781A (ja) * | 2013-04-01 | 2016-05-30 | チャイナ アカデミー オブ テレコミュニケーションズ テクノロジー | 通信を行う方法及び装置 |
| CN105409138B (zh) * | 2013-07-26 | 2018-09-25 | Lg 电子株式会社 | 发送用于mtc的信号的方法及其装置 |
| US9907055B2 (en) | 2013-07-26 | 2018-02-27 | Lg Electronics Inc. | Method for transmitting signal for MTC and apparatus for same |
| US10448373B2 (en) | 2013-07-26 | 2019-10-15 | Lg Electronics Inc. | Method for transmitting signal for MTC and apparatus for same |
| CN105409138A (zh) * | 2013-07-26 | 2016-03-16 | Lg电子株式会社 | 发送用于mtc的信号的方法及其装置 |
| WO2015012665A1 (ko) * | 2013-07-26 | 2015-01-29 | 엘지전자 주식회사 | Mtc를 위한 신호 전송 방법 및 이를 위한 장치 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012134107A3 (ko) | 2013-01-03 |
| US20130223298A1 (en) | 2013-08-29 |
| KR20130071485A (ko) | 2013-06-28 |
| CN103201968B (zh) | 2016-05-04 |
| CN103201968A (zh) | 2013-07-10 |
| KR101517310B1 (ko) | 2015-05-04 |
| US9155079B2 (en) | 2015-10-06 |
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