WO2013073918A1 - Procédé et appareil de commande d'émission/réception de canaux physiques dans système de communication à duplexage par répartition temporelle - Google Patents

Procédé et appareil de commande d'émission/réception de canaux physiques dans système de communication à duplexage par répartition temporelle Download PDF

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Publication number
WO2013073918A1
WO2013073918A1 PCT/KR2012/009790 KR2012009790W WO2013073918A1 WO 2013073918 A1 WO2013073918 A1 WO 2013073918A1 KR 2012009790 W KR2012009790 W KR 2012009790W WO 2013073918 A1 WO2013073918 A1 WO 2013073918A1
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Prior art keywords
component carrier
transmission
pusch
time
reception
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PCT/KR2012/009790
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English (en)
Korean (ko)
Inventor
김영범
조준영
김윤선
지형주
최승훈
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삼성전자 주식회사
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Priority claimed from KR20110127506A external-priority patent/KR20130054896A/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to US14/359,076 priority Critical patent/US20140307597A1/en
Publication of WO2013073918A1 publication Critical patent/WO2013073918A1/fr

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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
    • H04L1/1861—Physical mapping arrangements
    • 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

Definitions

  • the present invention relates to a cellular wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving a physical channel in a time division duplex (TDD) system supporting carrier aggregation.
  • TDD time division duplex
  • the wireless communication system has gone beyond the initial voice-oriented service, for example, High Speed Packet Access (HSPA) of the 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE), and High Rate Packet Data of 3GPP2. ), Such as UMB (Ultra Mobile Broadband) and IEEE 802.16e, has been evolving into a broadband wireless communication system that provides high-speed, high-quality packet data services.
  • HSPA High Speed Packet Access
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • 3GPP2 High Rate Packet Data of 3GPP2.
  • UMB Ultra Mobile Broadband
  • IEEE 802.16e IEEE 802.16e
  • downlink employs an orthogonal frequency division multiplexing (OFDM) scheme
  • OFDM orthogonal frequency division multiplexing
  • SC uplink
  • SC-FDMA single carrier frequency division multiple access
  • TDD Time Division Duplex
  • LTE and LTE-A TDD uplink or downlink signals are classified and transmitted for each subframe that is a unit of a time domain.
  • the uplink and downlink subframes are divided evenly in the time domain, or more subframes are allocated to the downlink or more uplink. Many subframes can be allocated and operated.
  • a control channel for data scheduling, a scheduled data channel, and a HARQ (Hybrid Automatic Retransmission Request) ACK / NACK channel corresponding to the data channel are mutually available.
  • HARQ Hybrid Automatic Retransmission Request
  • the timing relationship between physical channels of the LTE TDD system is applied to an LTE-A system supporting carrier combining, it is necessary to define an additional operation in addition to the timing relationship.
  • it is necessary to define a specific method for a half-duplex operation in which a terminal can perform only one operation of downlink signal reception or uplink signal transmission in one transmission time period.
  • a specific time period is set to a downlink subframe or a special subframe in a predetermined component carrier, and is set to an uplink subframe in another component carrier combined with the predetermined component carrier, the terminal applies a semi-duplex operation. In this time period, it is necessary to define how to receive a downlink signal or transmit an uplink signal.
  • the present invention provides a method and apparatus for transmitting and receiving signals in a communication system.
  • the present invention provides a method and apparatus for transmitting and receiving a data channel and a control channel in a TDD wireless communication system constituting a broadband through carrier aggregation (CA).
  • CA carrier aggregation
  • the present invention provides a method and apparatus for determining a communication direction (uplink or downlink) of a half-duplex terminal when the TDD uplink-downlink configuration of the combined carriers in the TDD wireless communication system is different for each carrier.
  • Method for controlling physical channel transmission / reception in a time division duplex (TDD) communication system, the transmission time of a hybrid automatic retransmission request (HARQ) ACK / NACK in component carrier # 1, and the component carrier # 1 and And determining whether the transmission time points of the other signals in the combined component carrier # 2 overlap, and if the transmission time points overlap, transmitting or receiving the HARQ ACK / NACK preferentially.
  • TDD time division duplex
  • HARQ hybrid automatic retransmission request
  • a method for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: determining whether a transmission time of an uplink HARQ ACK / NACK and a reception time of a downlink HARQ ACK / NACK overlap; If they overlap, it includes a process of preferentially transmitting the uplink HARQ ACK / NACK.
  • TDD time division duplex
  • a method for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a physical downlink control channel for scheduling a physical uplink shared channel (PUSCH) in component carrier # 1
  • PUSCH physical uplink shared channel
  • the method includes transmitting the PUSCH of the component carrier # 2 first.
  • a method for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a transmission time of a PDCCH, which is a downlink control channel for scheduling a PUSCH in component carrier # 1, and a component carrier combined with component carrier # 1 Determining whether transmission time points of a PUSCH, which is an uplink data channel in # 2, overlap, and when the transmission time points overlap, and the PDCCH of the component carrier # 1 schedules retransmission of the PUSCH of the component carrier # 1, the configuration Compare the transmission time of the PDCCH that originally scheduled the PUSCH of the carrier # 1 and the transmission time of the PDCCH that originally scheduled the PUSCH of the carrier # 2, and compare the signal of the component carrier corresponding to a time earlier or more recent. Receiving or transmitting.
  • TDD time division duplex
  • a method for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a transmission time and a configuration carrier # of a random access channel (RACH) or a scheduling request (SR) in component carrier # 1; Determining whether the reception time points of the downlink signals overlap at 2; and transmitting the RACH or SR of the component carrier # 1 when the time points overlap.
  • TDD time division duplex
  • An apparatus for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a transmission time of a HARQ ACK / NACK on a component carrier # 1, and a component carrier # 1 combined with a component carrier # 1 And a controller for determining whether the transmission time points of the other signals in 2 overlap, and a transmission / reception unit for preferentially transmitting or receiving the HARQ ACK / NACK when the transmission time points overlap.
  • TDD time division duplex
  • An apparatus for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a controller for determining whether a transmission time of an uplink HARQ ACK / NACK overlaps with a reception time of a downlink HARQ ACK / NACK; If they overlap, it includes a transceiver for preferentially transmitting the uplink HARQ ACK / NACK.
  • TDD time division duplex
  • An apparatus for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a transmission time of a physical downlink control channel (PDCCH) for scheduling a physical uplink data channel (PUSCH) in component carrier # 1; A controller for determining whether a PUSCH transmission time in a component carrier # 2 combined with a component carrier # 1 overlaps, and the transmission times overlap, and the PDCCH of the component carrier # 1 schedules initial transmission of the PUSCH of the component carrier # 1.
  • PDCCH physical downlink control channel
  • PUSCH physical uplink data channel
  • it includes a transceiver for preferentially transmitting the PUSCH of the component carrier # 2.
  • An apparatus for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: a transmission time of a PDCCH, which is a downlink control channel for scheduling a PUSCH in component carrier # 1, and a component carrier combined with component carrier # 1
  • a controller for determining whether a transmission time point of a PUSCH which is an uplink data channel in # 2 overlaps, and when the transmission time points overlap and the PDCCH of the component carrier # 1 schedules retransmission of the PUSCH of the component carrier # 1, the configuration Compare the transmission time of the PDCCH that originally scheduled the PUSCH of the carrier # 1 and the transmission time of the PDCCH that originally scheduled the PUSCH of the carrier # 2, and compare the signal of the component carrier corresponding to a time earlier or more recent. It includes a transceiver for receiving or transmitting.
  • An apparatus for controlling physical channel transmission and reception in a time division duplex (TDD) communication system comprising: transmitting a random access channel (RACH) or a scheduling request (SR) on a component carrier # 1 and receiving a downlink signal on a component carrier # 2 And a controller for determining whether the viewpoints overlap, and a transceiver for transmitting the RACH or the SR of the component carrier # 1 when the viewpoints overlap.
  • RACH random access channel
  • SR scheduling request
  • a transmission scheme of physical channels for transmitting data or control information is defined in a TDD wireless communication system constituting a broadband through carrier combining to prevent transmission or reception errors or transmission delay of the data or control channel.
  • 1 is a diagram illustrating an example of scheduling downlink data in a wireless communication system.
  • FIG. 2 is a diagram illustrating a specific example of a cross carrier scheduling operation.
  • FIG. 3 illustrates timing of an uplink HARQ ACK / NACK for a PDSCH in a TDD wireless communication system.
  • FIG. 4 is a diagram illustrating a timing relationship of a PHICH corresponding to an uplink PUSCH in a TDD communication system.
  • FIG. 5 is a diagram illustrating a transmission / reception relationship of a half-duplex terminal when the TDD uplink-downlink configuration of the combined carriers is different for each carrier according to an embodiment of the present invention.
  • 6 to 10 are flowcharts illustrating an operation of determining transmission priorities of physical channels according to an embodiment of the present invention.
  • FIG. 11 is a diagram illustrating a base station apparatus according to an embodiment of the present invention.
  • FIG. 12 illustrates a terminal device according to an embodiment of the present invention.
  • Embodiments of the present invention will be described as an example of an advanced Evolved Universal Terrestrial Radio Access (E-UTRA) (or LTE-A) system supporting carrier aggregation, but similar technical background and / or channel will be described.
  • Embodiments of the present invention may be applied to other communication systems having a form.
  • embodiments of the present invention can be applied to other communication systems through some modifications within the scope of not departing from the scope of the present invention by the judgment of those skilled in the art.
  • a timing relationship according to an aspect of an embodiment may also be applied to a multicarrier HSPA system supporting carrier combining.
  • the base station is a subject performing resource allocation of the terminal, and may be at least one of an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network.
  • the terminal may be at least one of a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function.
  • the LTE system employs a hybrid automatic repeat request (HARQ) scheme in which the data is retransmitted in the physical layer when a decoding failure occurs in the initial transmission.
  • HARQ hybrid automatic repeat request
  • the receiver when the receiver does not correctly decode the data, the receiver transmits information (NACK) indicating the decoding failure to the transmitter, thereby enabling the transmitter to retransmit the corresponding data in the physical layer.
  • NACK information indicating the decoding failure
  • the receiver combines the data retransmitted by the transmitter with the previously decoded data to improve the data reception performance.
  • the receiver may transmit information (ACK) indicating the successful decoding to the transmitter so that the transmitter may transmit new data.
  • the LTE system may have various bandwidths such as 20/15/10/5/3 / 1.4 MHz.
  • Service providers may select at least one of the above bandwidths to provide a service, and there may be various types of terminals, such as those capable of supporting a maximum 20 MHz bandwidth to supporting only a minimum of 1.4 MHz bandwidth.
  • the LTE-A system may provide a broadband service up to 100 MHz bandwidth through carrier aggregation.
  • LTE-A system requires broadband than LTE system for high-speed data transmission.
  • backward compatibility for LTE terminals is also important, so that LTE terminals should also be able to access the LTE-A system and receive services.
  • the LTE-A system divides the entire system band into subbands or component carriers (CCs) of a bandwidth that can be transmitted or received by the LTE terminal, combines predetermined component carriers, and then configures each component carrier.
  • CCs component carriers
  • DCI downlink control information
  • DCI can have a variety of formats, whether the scheduling information for uplink data or downlink data, whether it is a compact DCI, whether spatial multiplexing using multiple antennas, power control DCI format determined according to whether or not the DCI for the application is applied.
  • DCI format 1 which is control information for downlink data that does not apply MIMO (Multiple Input Multiple Output), is composed of the following control information.
  • Resource allocation type0 / 1 flag This indicates whether the resource allocation method is type 0 or type 1.
  • Type 0 allocates resources in RBG (resource block group) units by applying a bitmap method.
  • the basic unit of scheduling is a resource block (RB) represented by time and frequency domain resources
  • the RBG is composed of a plurality of RBs and becomes a basic unit of scheduling in a type 0 scheme.
  • Type 1 allows a specific RB to be allocated within the RBG.
  • Resource block assignment Notifies the RB allocated for data transfer.
  • the resource to be expressed is determined by the system bandwidth and the resource allocation method.
  • Modulation and coding scheme Notifies the modulation scheme and coding rate used for data transmission.
  • HARQ process number Notifies the process number of HARQ.
  • New data indicator Indicate whether HARQ initial transmission or retransmission.
  • Redundancy version Notifies the redundancy version of the HARQ.
  • TPC command for PUCCH Notifies a power control command for a physical uplink control channel (PUCCH) that is an uplink control channel.
  • PUCCH physical uplink control channel
  • DCI is transmitted through a physical downlink control channel (PDCCH) which is a downlink physical control channel through channel coding and modulation.
  • PDCCH physical downlink control channel
  • FIG. 1 illustrates an example of scheduling of downlink data in a wireless communication system.
  • CC # 1 and CC # 2 are combined, a case in which a base station schedules downlink data to a terminal is illustrated.
  • the DCI 101 transmitted in Component Carrier # 1 (CC # 1, 109) is channel coded and interleaved after applying a format defined in the existing LTE to generate a PDCCH 103. do.
  • the PDCCH 103 informs the UE of scheduling information on the physical downlink shared channel (PDSCH) 213 which is a data channel allocated to the UE in CC # 1109.
  • the DCI 105 transmitted from component carrier # 2 (CC # 2, 111) applies a format defined in the existing LTE, and is channel coded and interleaved to generate the PDCCH 107.
  • the PDCCH 107 informs the UE of scheduling information for the PDSCH 115, which is a data channel allocated to the UE in CC # 2111.
  • DCI downlink control information
  • This scheduling method is called self-scheduling.
  • data may be transmitted on a component carrier different from the component carrier on which data is transmitted, which is called cross carrier scheduling.
  • the DCI is transmitted through component carrier # 1 having relatively low influence of interference.
  • Can transmit In the case of PDSCH for transmitting data, the influence of the interference can be overcome by a method such as frequency selective scheduling or HARQ, but in case of PDCCH for transmitting DCI, HARQ is not applied, and is transmitted over the entire band of the frequency Since selective scheduling cannot be applied, a countermeasure is needed to overcome the interference.
  • FIG. 2 illustrates a specific example of a cross carrier scheduling operation.
  • the scheduling operation for the LTE-A terminal carrier-carried to the component carrier # 1 (Component carrier # 1; CC # 1, 209) and the component carrier # 2 (Component carrier # 2; DL CC # 2, 219) To illustrate.
  • DCI which is scheduling information for data transmission of CC # 2 219
  • CC Downlink Reference Signal
  • the base station additionally transmits a carrier indicator (CI) for which component carrier the DCI represents scheduling information, in addition to the DCI indicating resource allocation information and transmission format of the scheduled data.
  • CI '00 'represents scheduling information for CC # 1 209
  • CI '01' represents scheduling information for CC # 2 219.
  • modulation is performed.
  • the PDCCH is mapped to the PDCCH region 205 of CC # 1 and transmitted.
  • modulation After configuring the PDCCH through interleaving, the PDCCH region 205 of the CC # 1 is mapped and transmitted.
  • uplink or downlink signals are divided and transmitted for each subframe.
  • the length of a subframe is 1ms, and 10 subframes are combined to form one radio frame.
  • Table 1 below shows a TDD uplink-downlink configuration defined in LTE.
  • 'D' represents a subframe configured for downlink transmission
  • 'U' represents a subframe configured for uplink transmission
  • 'S' represents DwPTS (Dwonlink Pilot Time Slot) and GP (Guard). Period) and a special subframe consisting of an Uplink Pilot Time Slot (UpPTS).
  • the control information can be transmitted in the downlink as in the general subframe, and the downlink data can be transmitted if the length of the DwPTS is long enough according to the setting state of the special subframe.
  • the GP is a period for accommodating the transition of the transmission signal from the downlink to the uplink, and the length is determined according to the network configuration.
  • UpPTS is used for transmitting a SRS (Sounding Reference Signal) of a terminal required for estimating an uplink channel state or for transmitting a random access channel (RACH) of a terminal for random access.
  • SRS Sounding Reference Signal
  • downlink data and control information can be transmitted in subframes # 0, # 5, and # 9, and subframes # 2, # 3, # 4, and # 7.
  • Uplink data and control information can be transmitted to # 8.
  • downlink control information and downlink data can be transmitted in some cases, and SRS or RACH can be transmitted in uplink.
  • a physical downlink shared channel which is a physical channel for downlink data transmission
  • a physical uplink control channel PUCCH
  • a PUSCH Physical
  • the uplink / downlink timing relationship of Uplink Shared Channel is as follows.
  • the UE When the UE receives the PDSCH transmitted in the subframe n-k from the base station, the UE performs uplink HARQ ACK / NACK for the PDSCH in the uplink subframe n.
  • k is a member of the set K.
  • K is defined as shown in Table 2 below.
  • FIG. 3 shows timing of an uplink HARQ ACK / NACK for a PDSCH in a TDD wireless communication system.
  • TDD uplink-downlink configuration # 6 when a PDSCH is transmitted in each downlink or special subframe, it is determined in which surf frame an uplink HARQ ACK / NACK corresponding to the data of the PDSCH is transmitted in ⁇ Illustrated according to the definition in Table 2>.
  • the uplink HARQ ACK / NACK 303 corresponding to the PDSCH 301 transmitted by the base station in subframe # 0 of the radio frame i is transmitted from the UE in subframe # 7 of the radio frame i.
  • the downlink control information (DCI) including scheduling information about the PDSCH 301 is transmitted through the PDCCH in the same subframe in which the PDSCH 301 is transmitted.
  • the uplink HARQ ACK / NACK 307 corresponding to the PDSCH 305 transmitted by the base station in the subframe # 9 of the radio frame i is transmitted from the terminal in the subframe # 4 of the radio frame i + 1.
  • downlink control information (DCI) including scheduling information for the PDSCH 305 is transmitted through the PDCCH in the same subframe in which the PDSCH 305 is transmitted.
  • downlink HARQ adopts an asynchronous HARQ scheme in which data retransmission timing is not fixed. That is, when receiving a HARQ NACK feedback from the terminal on the HARQ initial transmission data transmitted by the base station, the base station freely determines the time of transmission of the next HARQ retransmission data by the scheduling operation. The UE buffers the HARQ data determined as an error as a result of decoding the received data for the HARQ operation, and then performs combining with the next HARQ retransmission data. In this case, in order to maintain the reception buffer capacity of the UE within a certain limit, the maximum number of downlink HARQ processes may be defined for each TDD uplink-downlink configuration. One HARQ process is mapped to one subframe in the time domain.
  • Table 3 shows an example of mapping of the maximum number of downlink HARQ processes corresponding to the TDD uplink-downlink configuration.
  • the UE decodes the PDSCH 301 transmitted by the base station in subframe # 0 of the radio frame i and transmits the HARQ NACK 303 to the subframe # 7 of the radio frame i. do.
  • the base station receives the HARQ NACK 303, the base station configures retransmission data for the PDSCH 301 as the PDSCH 309 and transmits the data with the PDCCH.
  • the maximum number of downlink HARQ processes of TDD uplink-downlink configuration # 6 is 6, so that retransmission data is transmitted to subframe # 1 of radio frame i + 1. It illustrates what is transmitted. That is, a total of six downlink HARQ processes 311, 312, 313, 314, 315, and 316 exist between the initial transmission PDSCH 301 and the retransmission PDSCH 309.
  • the uplink HARQ adopts a synchronous HARQ scheme with a fixed data transmission time point. That is, a Physical Uplink Shared Channel (PUSCH), which is a physical channel for transmitting uplink data, a PDCCH, which is a preceding downlink control channel, and a PHICH (Physical Hybrid Indicator), which is a physical channel through which downlink HARQ ACK / NACK is transmitted corresponding to the PUSCH.
  • PUSCH Physical Uplink Shared Channel
  • PDCCH which is a preceding downlink control channel
  • PHICH Physical Hybrid Indicator
  • the terminal When the UE receives a PDCCH including a DCI format 0, which is uplink scheduling control information transmitted from a base station, or a PHICH in which downlink HARQ ACK / NACK is transmitted, the terminal corresponds to the control information in subframe n + k.
  • Uplink data is transmitted through the PUSCH.
  • k may be defined as shown in Table 4 below.
  • the PHICH When the terminal receives the PHICH carrying downlink HARQ ACK / NACK from the base station in subframe i, the PHICH corresponds to the PUSCH transmitted by the terminal in subframe i-k.
  • k may be defined as shown in Table 5 below.
  • FIG. 4 illustrates a timing relationship of a PHICH corresponding to an uplink PUSCH in a TDD communication system.
  • TDD uplink-downlink configuration # 1 when a PDCCH or a PHICH is transmitted in each downlink or special subframe, which subframe is transmitted to which uplink PUSCH is transmitted, and again corresponds to the PUSCH In which subframe the PHICH is transmitted is illustrated according to the definitions in Tables 4 and 5.
  • the uplink PUSCH 403 corresponding to the PDCCH or PHICH 401 transmitted by the base station in subframe # 1 of the radio frame i is transmitted from the UE in subframe # 7 of the radio frame i.
  • the base station transmits a PHICH 405 corresponding to the PUSCH 403 to the terminal in subframe # 1 of the radio frame i + 1.
  • the uplink PUSCH 409 corresponding to the PDCCH or PHICH 407 transmitted by the base station in subframe # 6 of the radio frame i is transmitted from the UE in subframe # 2 of the radio frame i + 1.
  • the base station transmits a PHICH 411 corresponding to the PUSCH 409 to the terminal in subframe # 6 of the radio frame i + 1.
  • the downlink transmission of the PDCCH or PHICH corresponding to the PUSCH is limited in a specific downlink subframe in order to guarantee the minimum transmission / reception processing time of the base station and the UE.
  • the PICH or PICH corresponding to the PUSCH is not transmitted in downlink.
  • the scheduling operation for controlling the component carrier to transmit the downlink control information (DCI) for supporting data transmission and the component carrier to transmit the uplink or downlink data scheduled by the DCI cross each other.
  • This is called carrier scheduling.
  • the self-scheduling scheduling operation of controlling a component carrier on which downlink control information (DCI) is transmitted to support data transmission and a component carrier on which uplink or downlink data scheduled by the DCI are identical to each other are transmitted. It is called self-scheduling.
  • TDD uplink-downlink configuration according to a system operation scenario Can be set differently for each component carrier.
  • the first component carrier divides uplink / downlink subframes evenly in the time domain, and the second component carrier allocates more downlink subframes to expand the downlink capacity.
  • the first component carrier is applied between the TD-SCDMA and the LTE TDD system by applying a TDD uplink-downlink configuration that is compatible with the TD-SCDMA system.
  • Mutual interference problem and the second component carrier can operate by determining the TDD uplink-downlink configuration according to the traffic load (traffic load) without any restrictions.
  • Pcell primary cell
  • Scell secondary cell
  • PUCCH Primary Component Carrier
  • the terminal may perform only one operation of downlink signal reception or uplink signal transmission at some point, that is, half-duplex operation in which downlink signal reception and uplink signal transmission cannot be simultaneously performed.
  • one component carrier at a time point is a downlink subframe or a special subframe.
  • it is necessary to define how a terminal applying a semi-duplex operation receives a downlink signal or transmits an uplink signal at a time point configured as an uplink subframe. .
  • FIG. 5 illustrates a transmission / reception relationship of a half-duplex terminal when the TDD uplink-downlink configuration of the combined carriers is different for each carrier according to an embodiment of the present invention.
  • the Pcell 501 has a TDD uplink-downlink configuration # 3
  • the Scell 503 has a TDD uplink-downlink configuration # 1. If the base station transmits the PDSCH 507 to be transmitted in the Pcell and the PDCCH 505 scheduling the PDSCH 507 in subframe # 0, the transmission timing of the HARQ ACK / NACK corresponding to the PDSCH 507 is ⁇ Subframe # 4 according to the timing relationship defined for TDD uplink-downlink configuration # 3 of Table 2>, and the UE transmits HARQ ACK / NACK through the Pcell (509).
  • the base station wants to schedule the PUSCH 513 to be transmitted in subframe # 8 of the Scell, the PUSCH 513 according to the timing relationship defined for the TDD uplink-downlink configuration # 1 of Table 4, for example.
  • the PDCCH 511 for scheduling S is transmitted in subframe # 4 of the Scell.
  • the half-duplex terminal cannot transmit the downlink signal while simultaneously transmitting the uplink signal in subframe # 4, the priority of the transmit / receive signal should be defined.
  • PUCCH to be transmitted in subframe # 4 of the Pcell is an uplink signal including a HARQ ACK / NACK signal indicating whether the UE has successfully received a PDSCH transmitted before subframe # 4 and is essential for performing HARQ operation. Because it is a signal. Accordingly, the transmission time of the PDCCH for scheduling the PUSCH of the Scell to be transmitted later than the subframe # 4 is adjusted so as not to overlap with the subframe # 4 to which the PUCCH is transmitted according to the scheduling decision of the base station.
  • the UE when the UE receives the PDSCH in the subframe # 0 of the Pcell, the UE transmits the PUCCH corresponding to the PDSCH in the subframe # 4 of the Pcell, and does not receive the downlink signal in the subframe # 4 of the Scell.
  • the priority (priority 1) of the uplink or downlink signal of the half-duplex terminal is as shown in FIGS. 6 and 7.
  • the HARQ ACK / NACK signal is transmitted or received.
  • the HARQ ACK / NACK is transmitted from a terminal through a PUCCH which is an uplink control channel or is included in a PUSCH which is an uplink data channel and transmitted from a terminal.
  • the terminal may be received through the PHICH, which is a downlink HARQ ACK / NACK control channel.
  • the UE when reception points of uplink HARQ ACK / NACK and downlink HARQ ACK / NACK overlap (710), the UE transmits HARQ ACK / NACK in uplink (720). Since HARQ ACK / NACK transmitted on the uplink includes a plurality of HARQ ACK / NACK corresponding to PDSCH transmitted from a plurality of component carriers, unlike HARQ ACK / NACK received on the downlink, it is transmitted on the uplink. The amount of information loss is minimized by increasing the priority of HARQ ACK / NACK.
  • the UE When the transmission time points of the PDCCH, which is a downlink control channel for scheduling the PUSCH in component carrier # 1, and the PUSCH, which is an uplink data channel in component carrier # 2 combined with the component carrier # 1, overlap with each other, the UE is shown in FIGS.
  • the priority (priority 2) shown in Figs. 9A and 9B is followed.
  • the PDCCH for scheduling the PUSCH is transmitted before k (k is a positive integer) subframe from the PUSCH transmission time.
  • a PDCCH of component carrier # 1 schedules initial transmission of a PUSCH of component carrier # 1 (810)
  • the UE transmits a PUSCH of component carrier # 2 (820). This is because the scheduling decision of the base station for the PUSCH of the configuration carrier # 2 is made faster than the scheduling determination for the PUSCH of the configuration carrier # 1, so that it depends on the temporal dependency.
  • the UE transmits a PDCCH when the PUSCH of component carrier # 1 is scheduled and the component carrier are initially scheduled.
  • the transmission time of the PDCCH that originally scheduled the PUSCH of # 2 is compared, and a signal of a component carrier corresponding to a time point earlier is received or transmitted (920). That is, once the PUSCH transmission is initiated, the terminal preferentially processes the operation of the associated transmission and reception signals such as PDCCH and PUSCH until successful transmission of the corresponding PUSCH. This gives priority to services that occur earlier in time.
  • the transmission time of the PDCCH which is a downlink control channel for scheduling the PUSCH in component carrier # 1
  • the PUSCH which is an uplink data channel in component carrier # 2 combined with the component carrier # 1
  • the terminal follows the priority (priority 2-1) shown in Fig. 9A.
  • the PDCCH for scheduling the PUSCH is transmitted before k (k is a positive integer) subframe before the PUSCH transmission time.
  • the UE transmits the PDCCH when the PUSCH of the component carrier # 1 is first scheduled and the component carrier.
  • the transmission time of the PDCCH which originally scheduled the PUSCH of # 2 is compared, and a signal of a component carrier corresponding to the most recent time in time is received or transmitted (940). That is, the terminal determines that the scheduling of the base station at the most recent time point is valid and operates accordingly.
  • the UE transmits the PUSCH of the component carrier # 2 according to the PDCCH .
  • the terminal When the UE transmits a RACH for performing random access on component carrier # 1 or a SR (Scheduling Request) for scheduling request and the time for receiving a downlink signal on component carrier # 2 overlaps, the terminal is shown in FIG. 10.
  • the priority (Priority 3) shown in.
  • the UE if a transmission time of an uplink signal RACH or SR is overlapped with a transmission time of a downlink signal in component carrier # 2 (1010), the UE identifies RACH or SR of configuration carrier # 1. Transmit (1020).
  • the base station informs the terminal in advance of the reserved transmission resource through which the terminal can transmit the RACH or SR. Since it is difficult to predict in advance whether there is a downlink signal at the time when the UE determines to transmit the RACH or SR, in this case, priority is given to the RACH or SR transmission of the UE.
  • FIG. 11 illustrates a base station apparatus according to an embodiment of the present invention.
  • the base station apparatus includes a transmitter consisting of a transmission physical channel block 1106 and a multiplexer 1110 configured to generate signals of PDCCH, PDSCH, and PHICH, and signals of PUCCH, PUSCH, RACH, and SR. And a receiver comprising a receiving physical channel block 1108, a block, a demultiplexer 1112, a carrier combining controller 1104, and a scheduler 1102.
  • the carrier combining controller 1104 adjusts the priority relationship between the carrier combinations and the respective physical channels for the terminal to be scheduled by referring to the amount of data to be transmitted to the terminal, the amount of resources available in the system, and the like. Each physical channel block of the transmission and reception physical channel blocks 1106 and 1108 is informed.
  • the priority relationship follows the specific embodiments described above.
  • the physical channel signals multiplexed by the multiplexer 1110 are generated as OFDM signals and transmitted to the terminal.
  • FIG. 12 illustrates a terminal device according to an embodiment of the present invention.
  • a terminal includes a transmitter comprising a transmission physical channel block 1206 and a multiplexer 1210 configured to generate signals of PUCCH, PUSCH, RACH, and SR, and signals of PDCCH, PDSCH, and PHICH.
  • a receiving physical channel block 1204 configured to be demodulated and decodable, a receiving unit comprising a demultiplexer 1208, and a carrier combining controller 1202.
  • the carrier coupling controller 1202 adjusts the carrier coupling state of the UE from the DCI received from the base station, and on which carrier to receive the PDSCH during cross-carrier scheduling, and adjusts the priority relationship between the physical channels to transmit / receive physical information.
  • Each physical channel block of the channel blocks 1204 and 1206 is referred to. The priority relationship follows the specific embodiments described above.

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

Abstract

L'invention concerne un procédé et un appareil de commande d'émission/réception de canaux physiques dans un système de communication à duplexage par répartition temporelle (TDD). Le procédé comporte les étapes consistant : à déterminer si un positionnement temporel d'émission ACK/NACK HARQ dans une porteuse composante n°1 et un positionnement temporel d'émission d'un autre signal dans une porteuse composante n°2 couplée à la porteuse composante n°1 se chevauchent ou non ; à émettre ou à recevoir préférentiellement un signal ACK/NACK HARQ quand les positionnements temporels d'émission se chevauchent. Le procédé et l'appareil selon la présente invention peuvent ainsi prévenir une erreur d'émission/réception ou un retard de transmission d'un canal de données ou de commande.
PCT/KR2012/009790 2011-11-17 2012-11-19 Procédé et appareil de commande d'émission/réception de canaux physiques dans système de communication à duplexage par répartition temporelle WO2013073918A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/359,076 US20140307597A1 (en) 2011-11-17 2012-11-19 Method and apparatus for controlling transceiving of physical channels in time division duplex communication system

Applications Claiming Priority (4)

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KR20110120490 2011-11-17
KR10-2011-0120490 2011-11-17
KR10-2011-0127506 2011-12-01
KR20110127506A KR20130054896A (ko) 2011-11-17 2011-12-01 시분할 이중화 통신 시스템에서 물리채널 송수신의 제어 방법 및 장치

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