WO2011074906A2 - 중계국을 포함하는 통신 시스템에서 프레임을 통해 단말 및 기지국과 통신하는 방법 및 장치 - Google Patents
중계국을 포함하는 통신 시스템에서 프레임을 통해 단말 및 기지국과 통신하는 방법 및 장치 Download PDFInfo
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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
- 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
- H04L1/1887—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
- H04L5/14—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
- 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
- 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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for determining a HARQ timing or configuring a frame in consideration of HARQ timing in a wireless communication system including a relay station.
- the Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard is the sixth standard for International Mobile Telecommunications (IMT-2000) in the ITU-R (ITURadiocommunication Sector) under the International Telecommunication Union (ITU) in 2007. It was adopted under the name '. ITU-R is preparing the IMT-Advanced system as the next generation 4G mobile communication standard after IMT-2000.
- the IEEE 802.16 Working Group (WG) decided to implement the IEEE 802.16m project in late 2006 with the aim of creating an amendment specification for the existing IEEE 802.16e as a standard for IMT-Advanced systems.
- the IEEE 802.16m standard implies two aspects: past continuity of modification of the IEEE 802.16e standard and future continuity of the specification for next generation IMTAdvanced systems. Therefore, the IEEE 802.16m standard is required to satisfy all the advanced requirements for the IMT-Advanced system while maintaining compatibility with the Mobile WiMAX system based on the IEEE 802.16e standard.
- Orthogonal Frequency Division Multiplexing (OFDM) system that can attenuate inter-symbol interference (ISI) effects with low complexity.
- OFDM converts serially input data symbols into N parallel data symbols and transmits the data symbols on N subcarriers.
- the subcarriers maintain orthogonality in the frequency dimension.
- Each orthogonal channel experiences mutually independent frequency selective fading, and the interval between transmitted symbols is increased, thereby minimizing intersymbol interference.
- OFDMA refers to a multiple access method for realizing multiple access by independently providing each user with a portion of available subcarriers in a system using OFDM as a modulation method.
- OFDMA provides each user with a frequency resource called a subcarrier, and each frequency resource is provided to a plurality of users independently so that they do not overlap each other. Eventually, frequency resources are allocated mutually exclusively for each user.
- frequency diversity scheduling can be obtained through frequency selective scheduling, and subcarriers can be allocated in various forms according to permutation schemes for subcarriers.
- the spatial multiplexing technique using multiple antennas can increase the efficiency of the spatial domain.
- the control signal includes a CQI (Channel quality indicator) for reporting the channel status to the base station, an ACK / NACK (Acknowledgement / Notacknowledgement) signal for a response to data transmission, a bandwidth request signal for requesting allocation of radio resources, and a multi-antenna system Precoding information, antenna information, and the like.
- CQI Channel quality indicator
- ACK / NACK Acknowledgement / Notacknowledgement
- the HARQ technique combines a forward error correction (FEC) scheme and an automatic repeat request (ARQ) scheme.
- FEC forward error correction
- ARQ automatic repeat request
- the HARQ-type receiver basically attempts error correction on received data and determines whether to retransmit using an error detection code.
- the error detection code may use a cyclic redundancy check (CRC).
- CRC cyclic redundancy check
- the receiver sends a non-acknowledgement (NACK) signal to the transmitter.
- the transmitter receiving the NACK signal transmits appropriate retransmission data according to the HARQ mode.
- the receiver receiving the retransmitted data improves the reception performance by combining and decoding the previous data and the retransmitted data.
- the conventional HARQ mode can be classified into chase combining and incremental redundancy (IR).
- Chase combining is a method of obtaining a signal-to-noise ratio (SNR) gain by combining with retransmitted data without discarding the data where an error is detected.
- SNR signal-to-noise ratio
- IR is a method in which additional redundant information is incrementally transmitted to retransmitted data, thereby reducing the burden of retransmission and obtaining a coding gain.
- the relay station serves to extend cell coverage and improve transmission performance.
- the base station serves the terminal located at the coverage boundary of the base station through the relay station, it is possible to obtain the effect of extending the cell coverage.
- the relay station can increase the transmission capacity by improving the transmission reliability of the signal between the base station and the terminal. Even if the terminal is within the coverage of the base station, the relay station may be used when it is located in the shadow area.
- the relay station needs a radio resource area for downlink transmission to the relay station terminal connected to the relay station itself.
- the RS since the RS receives a signal from the RS and decodes it and retransmits it to the BS, a radio resource region for uplink transmission is required.
- An object of the present invention is to provide a method and apparatus to which the HARQ technique is applied in a communication system including a relay station.
- a TDD including a plurality of downlink subframes and a plurality of uplink subframes Constructing a frame; And communicating with at least one of a terminal and a base station through the TDD frame, wherein a first number of subframes of the downlink subframe and a second number of subframes of the uplink subframe are used for the terminal.
- a third number of subframes among the downlink subframes and a fourth number of subframes among the uplink subframes are allocated to a relay zone for the base station, and the first to fourth numbers Provides a preset method.
- the relay zone is followed by the access zone, the first number of subframes is at least one subframe transmitted first of the downlink subframes, and the second number of subframes is the uplink. At least one subframe transmitted first among the link subframes, and the third number of subframes is at least one subframe transmitted last among the downlink subframes, and the fourth number of subframes is the uplink. It may be transmitted last of the subframes.
- a first number of subframes and a third number of subframes allocated to the access zone may be determined based on HARQ timing.
- An HARQ subpacket is transmitted through at least one subframe of the first number of subframes, and an ACK / NACK signal corresponding to the HARQ subpacket is transmitted through any one subframe of the third number of subframes. Can be sent.
- a second number of subframes and a fourth number of subframes allocated to the relay zone may be determined based on HARQ timing.
- An HARQ subpacket is transmitted through at least one subframe of the second number of subframes, and an ACK / NACK signal corresponding to the HARQ subpacket is transmitted through any one subframe of the fourth number of subframes. Can be sent.
- a subframe for the access zone among the downlink subframes, a subframe for the relay zone among the downlink subframes, and the uplink subframe may be 3: 2: 2: 1 or 2: 3: 1: 2.
- At least two of the first to fourth numbers may be equally determined.
- a data processing method for an ACK / NACK signal in a relay station communicating with at least one of a terminal and a base station the method being used for communication with at least one of the terminal and the base station And determining a radio resource for the ACK / NACK signal corresponding to the data, wherein the data and the ACK / NACK signal include a plurality of subframes.
- an uplink frame and a downlink frame, each of the uplink frame and the downlink frame include an access zone for the terminal and a relay zone for the base station, and wireless for at least one of the data and the ACK / NACK signal.
- the resource is determined based on at least the number of subframes included in the access zone or relay zone. It provides.
- the frequency at which the uplink frame is transmitted may be different from the frequency at which the downlink frame is transmitted.
- the data is transmitted through at least one downlink subframe included in the downlink frame, the ACK / NACK signal is transmitted through an uplink subframe included in the uplink frame, and the ACK / NACK signal is Each of the index of the transmitted frame and the index of the subframe in which the ACK / NACK signal is transmitted may be determined based on at least the number of uplink subframes included in the access zone or the relay zone.
- the data is transmitted through at least one uplink subframe included in the uplink frame, and the ACK / NACK signal is transmitted through a downlink subframe included in the downlink frame and the data is transmitted.
- an index of the subframe in which the data is transmitted are determined based at least on the number of uplink subframes included in the access zone or the relay zone, and the index of the frame in which the ACK / NACK signal is transmitted is at least the It may be determined based on the number of downlink subframes included in the access zone or the relay zone.
- the data is transmitted through at least one downlink subframe included in the downlink frame, the ACK / NACK signal is transmitted through an uplink subframe included in an uplink frame, and the ACK / NACK signal is transmitted.
- Each of the index of the frame and the index of the subframe in which the ACK / NACK signal is transmitted are at least the number of uplink subframes included in the access zone or relay zone, and the downlink subframe included in the access zone or relay zone. It may be determined based on the number of.
- the data is transmitted through at least one uplink frame included in the uplink frame, the ACK / NACK signal is transmitted through a downlink subframe included in the downlink frame, and the data is transmitted.
- Each of the index and the index of the subframe in which the data is transmitted is determined based on at least the number of uplink subframes included in the access zone or relay zone and the number of downlink subframes included in the access zone or relay zone,
- the index of the frame in which the ACK / NACK signal is transmitted may be determined based on at least the number of uplink subframes included in the access zone or relay zone and the number of downlink subframes included in the access zone or relay zone. have.
- Each of the subframes may include a plurality of OFDMA symbols.
- a method for communicating with a terminal and a base station through a frame in a wireless communication system including a relay station, the subframe for the first system included in one frame and the first Configuring one frame by multiplexing an access zone and a relay zone based on a subframe for the two systems; And communicating with at least one of a terminal and a base station through a frame including the access zone and the relay zone, wherein each of the subframe for the first system and the subframe for the second system includes a downlink subframe;
- a method includes an uplink subframe, and each of the access zone and the relay zone includes a downlink subframe and an uplink subframe.
- the first system may be an Institute of Electrical and Electronics Engineers (IEEE) 802.16e system
- the second system may be an IEEE 802.16m system.
- IEEE Institute of Electrical and Electronics Engineers
- a subframe for the first system and a subframe for the second system may be multiplexed by a TDM scheme.
- a downlink subframe among the subframes for the first system corresponds to a downlink access zone
- a downlink subframe among the subframes for the second system corresponds to a downlink relay zone and for the first system.
- An uplink subframe of the subframe may correspond to an uplink access zone
- an uplink subframe of the subframe for the second system may correspond to an uplink relay zone.
- the method may further include determining HARQ timing based on a structure of a subframe for the first system and a subframe for the second system.
- HARQ timing when an access zone and a relay zone are included in a frame, timing for HARQ operation can be determined.
- HARQ timing according to the present invention enables improved performance of communication.
- 1 shows a wireless communication system including a relay station.
- FIG. 2 shows an example of a frame structure.
- FIG. 3 shows an example of a TDD frame structure.
- FIG. 5 shows an example in which HARQ timing is determined when an FDD frame is used.
- FIG. 6 shows an example in which uplink HARQ timing is determined when an FDD frame is used.
- FIG 9 shows the structure of a TDD frame transmitted from a relay station.
- 11 shows an example in which a ratio of subframes allocated to downlink and uplink is set to 6: 2.
- FIG. 13 shows an example in which a ratio of subframes allocated to downlink and uplink is 4: 3.
- FIG. 14 is a diagram illustrating an example in which HARQ timing is determined according to the second embodiment.
- FIG. 15 is a diagram illustrating still another example in which HARQ timing is determined according to the second embodiment.
- 16 is a diagram illustrating still another example in which HARQ timing is determined according to the second embodiment.
- FIG. 17 is a diagram illustrating a default time delay for calculating a HARQ feedback offset z.
- FIG. 18 is a diagram illustrating a default time delay according to the third embodiment.
- 19 is a diagram illustrating another example of a default time delay according to the third embodiment.
- 20 is a diagram illustrating an example in which HARQ timing is determined according to a third embodiment.
- 21 is a diagram illustrating still another example in which HARQ timing is determined according to the third embodiment.
- FIG. 22 shows an example of a frame structure for supporting terminals belonging to two different systems.
- FIG. 23 simplifies the structure of a frame according to FIG. 22 based on subframes.
- FIG. 24 shows an example in which an uplink region of the frame of FIG. 23 is multiplexed using the TDM scheme.
- FIG. 25 simplifies the structure of a frame according to FIG. 24 on a subframe basis.
- FIG. 26 is an example of a TDD frame including an access zone and a relay zone according to the fourth embodiment.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
- TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
- GSM Global System for Mobile communications
- GPRS General Packet Radio Service
- EDGE Enhanced Data Rates for GSM Evolution
- OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (EUTRA).
- IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
- UTRA is part of the Universal Mobile Telecommunications System (UMTS).
- 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (EUMTS) using Evolved-UMTS Terrestrial Radio Access (E-UTRA), which employs OFDMA in downlink and SCFDMA in uplink.
- E-UTRA Evolved-UMTS Terrestrial Radio Access
- LTE-A Advanced
- 3GPP LTE Advanced
- 1 shows a wireless communication system including a relay station.
- a wireless communication system 10 including a relay station includes at least one base station 11 (BS).
- Each base station 11 provides a communication service for a particular geographic area 15, commonly referred to as a cell.
- the cell can be further divided into a plurality of areas, each of which is called a sector.
- One or more base stations may exist in one base station and one or more base stations may exist in one cell.
- the base station 11 generally refers to a fixed station communicating with the terminal 13, and includes an evolved NodeB (eNB), a Base Transceiver System (BTS), an Access Point, an Access Network (AN), It may be called other terms such as ABS (Advanced BS), Node (Node, Antenna Node).
- the base station 11 may perform functions such as connectivity, management, control, and resource allocation between the relay station 12 and the terminal 14.
- a relay station (RS) 12 refers to a device that relays a signal between the base station 11 and the terminal 14 and includes other relay nodes (RNs), repeaters, repeaters, and advanced RS (ARS). It may be called a term.
- RNs relay nodes
- ARS advanced RS
- a relay method used by the relay station any method such as AF and ADF may be used, and the technical spirit of the present invention is not limited thereto.
- the mobile station (MS) 13 or 14 may be fixed or mobile, and may include an advanced mobile station (AMS), 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 an assistant, a wireless modem, a handheld device, an access terminal, and a user equipment (UE).
- AMS advanced mobile station
- UT user terminal
- SS subscriber station
- PDA personal digital assistant
- the macro terminal is a terminal that communicates directly with the base station 11
- the relay station terminal refers to a terminal that communicates with the relay station. Even in the macro terminal 13 in the cell of the base station 11, it is possible to communicate with the base station 11 via the relay station 12 to improve the transmission rate according to the diversity effect.
- Downlink means communication from the base station to the macro terminal between the base station and the macro terminal
- uplink means communication from the macro terminal to the base station.
- Downlink between the base station and the relay station means communication from the base station to the relay station
- uplink means communication from the relay station to the base station.
- the downlink means the communication from the relay station to the relay station between the relay station and the terminal, and the uplink means the communication from the relay terminal to the relay station.
- FIG. 2 shows an example of a frame structure.
- a superframe includes a superframe header (SFH) and four frames (frames, F0, F1, F2, and F3).
- Each frame in the superframe may have the same length.
- the size of each superframe is 20ms and the size of each frame is illustrated as 5ms, but is not limited thereto.
- the length of the superframe, the number of frames included in the superframe, the number of subframes included in the frame, and the like may be variously changed.
- the number of subframes included in the frame may be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP).
- CP cyclic prefix
- One frame includes a plurality of subframes (subframe, SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7). Each subframe may be used for uplink or downlink transmission.
- One subframe includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols or an orthogonal frequency division multiple access (OFDMA) in a time domain, and includes a plurality of subcarriers in the frequency domain. do.
- the OFDM symbol is used to represent one symbol period, and may be called another name such as an OFDMA symbol or an SC-FDMA symbol according to a multiple access scheme.
- the subframe may be composed of 5, 6, 7 or 9 OFDMA symbols, but this is only an example and the number of OFDMA symbols included in the subframe is not limited.
- the number of OFDMA symbols included in the subframe may be variously changed according to the channel bandwidth and the length of the CP.
- a type of a subframe may be defined according to the number of OFDMA symbols included in the subframe.
- the type-1 subframe may be defined to include 6 OFDMA symbols
- the type-2 subframe includes 7 OFDMA symbols
- the type-3 subframe includes 5 OFDMA symbols
- the type-4 subframe includes 9 OFDMA symbols.
- One frame may include subframes of the same type. Alternatively, one frame may include different types of subframes.
- the number of OFDMA symbols included in each subframe in one frame may be the same or different.
- the number of OFDMA symbols of at least one subframe in one frame may be different from the number of OFDMA symbols of the remaining subframes in the frame.
- a time division duplex (TDD) scheme or a frequency division duplex (FDD) scheme may be applied to the frame.
- TDD time division duplex
- FDD frequency division duplex
- each subframe is used for uplink transmission or downlink transmission at different times at the same frequency. That is, subframes in a frame of the TDD scheme are classified into an uplink subframe and a downlink subframe in the time domain.
- the switching point refers to a point where the transmission direction is changed from the uplink region to the downlink region or from the downlink region to the uplink region. In the TDD scheme, the switching point may have two switching points in each frame.
- FDD each subframe is used for uplink transmission or downlink transmission at different frequencies at the same time. That is, subframes in the frame of the FDD scheme are divided into an uplink subframe and a downlink subframe in the frequency domain. Uplink transmission and downlink transmission occupy different frequency bands and may be simultaneously performed.
- the 20ms long superframe consists of four frames 5ms long (F0, F1, F2, F3).
- One frame consists of eight subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, and the ratio of the downlink subframe and the uplink subframe is 5: 3.
- the TDD frame structure of FIG. 3 may be applied when the bandwidth is 5 MHz, 10 MHz, or 20 MHz.
- SF4 the last downlink subframe includes 5 OFDM symbols and the remaining subframes include 6 subframes.
- the illustrated TTG represents a transition gap between uplink and downlink subframes.
- the 20ms long superframe consists of four frames 5ms long (F0, F1, F2, F3).
- One frame includes eight subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7, and all subframes include a downlink region and an uplink region.
- the FDD frame structure of FIG. 4 may be applied when the bandwidth is 5 MHz, 10 MHz, or 20 MHz.
- HARQ timing includes a timing at which information on radio resource allocation for HARQ operation is transmitted, a timing at which HARQ subpackets are transmitted, a timing at which feedback (ACK / NACK) is transmitted corresponding to HARQ subpackets, and HARQ subpackets. Contains the timing at which the packet is resent.
- Information about the allocation of radio resources for the HARQ operation may be included in the A-MAP IE.
- the information on the HARQ timing may be represented by indexes of the frames and subframes. That is, the information on the HARQ timing may be represented by a frame index and a subframe index.
- the subframe index may also be indicated as an AAI subframe index.
- the frame index may be set to 0 to 3.
- an index of a downlink subframe (DL AAI subframe) or an uplink subframe (UL AAI subframe) may be set to 0 to F-1.
- F means the number of subframes that can belong to one frame
- the index of the first subframe included in one frame is set to 0, the index of the last subframe may be set to F-1.
- a downlink subframe (DL AAI subframe) may be determined from 0 to D-1
- an uplink subframe (UL AAI subframe) may be determined from 0 to U-1.
- D may mean the number of downlink subframes included in one frame
- U may mean the number of uplink subframes included in one frame.
- HARQ timing will be described based on an AAI subframe index and a frame index.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which "A-MAP IE” including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in DL indicates downlink
- HARQ feedback in UL indicates a timing at which the HARQ subpacket transmitted on the link is transmitted
- HARQ feedback in UL indicates a timing at which ACK / NACK feedback for the HARQ subpacket is transmitted on the uplink.
- floor (x) is a function representing the largest integer less than or equal to x
- ceil (x) is a function representing the smallest integer greater than or equal to x
- mod is a modulo operation.
- l and m are variables for indicating the index of the subframe
- i and j are variables for indicating the index of the frame, respectively, which are determined as one of 0 to 3.
- l is set to any one of 0 to F-1, but is set to 0 to F-4 when a long transmission time interval (TTI) is transmitted.
- F is the number of subframes included in one frame.
- n is an index for indicating an uplink subframe.
- z is a downlink HARQ feedback offset is defined as shown in Equation 1 below. Below Is the number of subframes spanned by the HARQ subpacket. It is set to 1 for the default TTI (Default transmission time interval) and 4 for the long TTI.
- the processing time which indicates the time taken until the HARQ feedback is transmitted in the uplink after the A-MAP IE and the HARQ subpacket are transmitted in the downlink or after the A-MAP IE is transmitted in the downlink.
- the processing time until the HARQ subpacket is transmitted in the uplink may be indicated based on the number of subframes. Processing time ) May be variously classified according to the type of link (downlink, uplink). For example, when the downlink HARQ timing is determined in the FDD frame as shown in Table 1, the processing time is Alternatively, it may be indicated by a DL reception processing time. Is a data burst Rx processing time required by the terminal.
- 5 shows an example in which HARQ timing is determined when an FDD frame is used.
- 5 shows a processing time ( ) Is an example in which 3 is set.
- HARQ subpackets (ie, downlink data) according to the result of Table 1 and Equation 1 Burst) is transmitted through the same frame and the same subframe as the A-MAP IE, and HARQ feedback corresponding to the HARQ subpacket (ie, downlink data burst) may be transmitted through a subframe having an index of 5.
- the A-MAP IE and the downlink data burst for radio resource allocation are transmitted through the same downlink subframe 501, and the ACK / NACK for the corresponding downlink data burst.
- the signal may be transmitted through the uplink subframe 502 in consideration of a processing time.
- 5 is a case where HARQ subpacket is transmitted through a default TTI.
- the example of FIG. 5 applies to channels in the 5, 10, 15, and 20 MHz bands.
- uplink HARQ timing is determined when an FDD frame is used.
- Table 2 describes uplink HARQ timing when an FDD frame is used.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which an A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in UL indicates uplink
- HARQ feedback in DL indicates a timing at which the transmitted HARQ subpacket is transmitted
- HARQ feedback in DL indicates a timing at which ACK / NACK feedback for the HARQ subpacket is transmitted in downlink
- HARQ Subpacket ReTx in UL indicates a timing at which a corresponding HARQ subpacket is retransmitted when NACK feedback is transmitted.
- j, k, and p are variables for indicating a frame index, and are each set to 0 to 3
- v denotes an uplink HARQ transmission offset
- w denotes an uplink HARQ feedback offset.
- v and w are defined as in Equations 2 to 3 below.
- the processing time used in Equation 2 is for the HARQ subpacket transmission through the uplink, the UL transmission processing time or It may be represented as.
- the uplink transmission processing time may be expressed in units of subframes as a data burst Tx processing time required by the terminal.
- the processing time used in Equation 3 is for the HARQ feedback transmission through the downlink, the UL reception processing time or It may be represented as.
- the uplink reception processing time may be represented in units of subframes as a data burst Rx processing time required by the base station.
- 6 shows an example in which uplink HARQ timing is determined when an FDD frame is used.
- 6 shows a processing time ( ) Is an example in which 3 is set.
- the HARQ subpacket (that is, the uplink data burst) according to Table 2 is the subframe index.
- HARQ feedback corresponding to the HARQ subpacket is transmitted through a subframe having an index of 1 among subframes included in a frame having an index of i + 1.
- HARQ subpackets that is, uplink data bursts
- HARQ subpackets retransmitted corresponding to the corresponding HARQ feedback are transmitted through subframes having an index of 5 among subframes included in a frame having an index of i + 1.
- 6 is a case where HARQ subpacket is transmitted through a default TTI. The example of FIG. 6 applies to channels in the 5, 10, 15 and 20 MHz bands.
- an A-MAP IE for allocation of radio resources is transmitted through a downlink subframe 601, and a corresponding uplink data burst is a processing time ( It may be transmitted through the uplink subframe 602 in consideration of a processing time. That is, the A-MAP IE and the uplink data burst may be transmitted through different subframes. Meanwhile, the downlink subframe 603 to which HARQ feedback corresponding to the uplink data bus is transmitted has the same subframe index as the downlink subframe 601 to which the A-MAP IE is transmitted.
- the uplink subframe 604 in which the retransmitted HARQ subpacket is transmitted has the same subframe index as the uplink subframe 602 in which the previously transmitted HARQ subpacket is transmitted.
- the timing at which the corresponding HARQ feedback is transmitted after the data burst is transmitted is determined based on the process time.
- downlink HARQ timing is determined when a TDD frame is used.
- Table 3 describes downlink HARQ timing when a TDD frame is used.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which an A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in DL indicates a downlink
- HARQ feedback in UL indicates a timing at which a transmitted HARQ subpacket is transmitted
- HARQ feedback in UL indicates a timing at which ACK / NACK feedback for the HARQ subpacket is transmitted in an uplink.
- D means the number of downlink subframes included in one TDD frame
- U means the number of uplink subframes included in one TDD frame.
- K is a variable used to determine the subframe index.
- Equation (4) Is set to 1 for the default transmission time interval (TTI) and D for the long TTI.
- the processing time ( )silver It may be indicated by a DL reception processing time, which may be indicated by.
- 7 shows an example in which downlink HARQ timing is determined when a TDD frame is used.
- 7 shows a processing time ( ) Is an example in which 3 is set.
- the HARQ subpacket ie, downlink data burst
- Table 3 is A-MAP.
- HARQ feedback transmitted on the same frame and the same subframe as the IE and corresponding to the HARQ subpacket (ie, downlink data burst) is transmitted on an uplink subframe having an index of zero.
- the A-MAP IE and the downlink data burst for radio resource allocation are transmitted through the same downlink subframe 701, and the ACK / NACK for the corresponding downlink data burst.
- the signal may be transmitted through the uplink subframe 702 in consideration of a processing time.
- An example of FIG. 7 is a case where a HARQ subpacket is transmitted through a default TTI. The example of FIG. 7 applies to channels in the 5, 10, 15, and 20 MHz bands.
- Table 4 below describes uplink HARQ timing when a TDD frame is used.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which the A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in UL indicates uplink
- HARQ feedback in DL indicates a timing at which the transmitted HARQ subpacket is transmitted
- HARQ feedback in DL indicates a timing at which ACK / NACK feedback for the HARQ subpacket is transmitted in downlink
- HARQ Subpacket ReTx in UL indicates a timing at which a corresponding HARQ subpacket is retransmitted when NACK feedback is transmitted.
- D means the number of downlink subframes included in one TDD frame
- U means the number of uplink subframes included in one TDD frame
- K is a variable used to determine the subframe index.
- D is less than U, It is decided to, and in other cases It is decided.
- the l value is set to 0 to D-1.
- v represents an uplink HARQ transmission offset and w represents an uplink HARQ feedback offset.
- v and w are defined as in Equations 5 to 6 below.
- the processing time of Equation 5 may be UL transmission processing time or UL transmission processing time. It may be represented as.
- Equation (6) Is set to 1 for the default transmission time interval (TTI) and D for the long TTI.
- the processing time is UL reception processing time (UL reception processing time) or It may be represented as.
- 8 shows an example in which uplink HARQ timing is determined when a TDD frame is used. 8 shows a processing time ( ) Is an example in which 3 is set. As shown in FIG. 8, when the subframe index of the A-MAP IE is set to 1 and the frame index is set to i, the HARQ subpacket (that is, the uplink data burst) according to Table 4 is the subframe index. Is transmitted on an uplink subframe of 0. In addition, according to Table 4, HARQ feedback corresponding to a HARQ subpacket (ie, an uplink data burst) is transmitted through a downlink subframe having an index of 1 among subframes included in a frame having an index of i + 1.
- the HARQ subpacket (ie, uplink data burst) retransmitted in response to the corresponding HARQ feedback is transmitted through an uplink subframe having an index of 0 among subframes included in a frame having an index of i + 1.
- do. 8 is a case where HARQ subpacket is transmitted through a default TTI. The example of Figure 8 applies to all channels in the 5, 10, 15, 20 MHz band.
- an A-MAP IE for radio resource allocation is transmitted through a downlink subframe 801, and a corresponding uplink data burst is a processing time. It may be transmitted through an uplink subframe 802 in consideration of a processing time. That is, the A-MAP IE and the uplink data burst are transmitted through different subframes. Meanwhile, the downlink subframe 803 in which HARQ feedback corresponding to the uplink data bus is transmitted has the same subframe index as the downlink subframe 801 in which the A-MAP IE is transmitted.
- the uplink subframe 804 in which the retransmitted HARQ subpacket is transmitted has the same subframe index as the uplink subframe 802 in which the previously transmitted HARQ subpacket is transmitted.
- the timing at which the corresponding HARQ feedback is transmitted after the data burst is transmitted is determined based on the process time.
- the first embodiment described above describes an example in which HARQ technique is applied when a TDD frame is used.
- the method for determining HARQ timing based on Tables 3 to 4 is based on a system without a relay station. Therefore, in order to apply the techniques of Tables 3 to 4 to the system including the relay station, it is necessary to change the structure of the frame transmitted from the relay station.
- the TDD frame transmitted from the relay station includes a downlink access zone, a downlink relay zone, an uplink access zone, and an uplink relay zone. ) May be included.
- the order of the access zone / relay zone or the downlink / uplink order may be changed. That is, the relay zone may be arranged before the access zone.
- Each access zone and relay zone may be divided in subframe units.
- the number of subframes included in the downlink access zone and the downlink relay zone may be represented by a constant ratio, and the number of subframes included in the uplink access zone and the uplink relay zone may be represented by a constant ratio.
- some subframes of the downlink subframe and some subframes of the uplink subframe are allocated to the access zone, and some other subframes of the downlink subframe and some other subframes of the uplink subframe are Assigned to the relay zone.
- a first number of first subframes transmitted among the downlink subframes and a second number of starting subframes transmitted first of the uplink subframes may be allocated to the access zone.
- the first transmitted subframe means at least one subframe located on the leftmost side of the downlink or uplink subframe.
- a third number of subframes transmitted last among the downlink subframes and a fourth number of subframes transmitted last among the uplink subframes may be allocated to the relay zone.
- the last transmitted subframe means at least one subframe located at the far right of the downlink or uplink subframe.
- the first to fourth numbers may be determined to be all the same, only some, or all different.
- Subframes allocated to the same zone are subframes corresponding to each other.
- the correspondence between subframes may be determined based on HARQ timing. That is, the arrangement of the downlink access zone, the downlink relay zone, the uplink access zone, and the uplink relay zone in the TDD frame may be determined based on the HARQ timing. In other words, the first to fourth numbers may be determined based on HARQ timing.
- HARQ timing a specific example of determining an arrangement of a downlink access zone, a downlink relay zone, an uplink access zone, and an uplink relay zone in a TDD frame based on HARQ timing will be described.
- FIG. 10 shows an example in which a ratio of subframes allocated to downlink and uplink is 5: 3. For example, if the processing time according to Tables 3 to 4 is set to 3, HARQ timing as shown in FIG. 10 can be obtained.
- an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink subframe having a subframe index of zero.
- an uplink subframe (shown as 1 ') corresponding to a downlink subframe having a subframe index of 1 is also an uplink subframe having a subframe index of 0.
- an uplink subframe (shown as 2 ') corresponding to a downlink subframe (shown as 2) having a subframe index of 2 is an uplink subframe having a subframe index of 1 and a subframe index of 3
- the uplink subframe (shown as 3 ') corresponding to the downlink subframe (shown as 3) is an uplink subframe having a subframe index of 2.
- an uplink subframe (shown as 4 ') corresponding to a downlink subframe having a subframe index of 4 (shown as 4) is determined as an uplink subframe having a subframe index of 2 in the i + 1th frame. All.
- HARQ feedback corresponding thereto may be transmitted through an uplink subframe indicated by 0 '.
- the HARQ subpacket may be transmitted through the uplink subframe indicated by 0 '.
- a downlink subframe having a subframe index of 0 and a downlink subframe having a subframe index of 1 may be included in one zone (access zone or relay zone). This is because the feedback on the downlink subframe having the subframe index of 0 and the downlink subframe having the subframe index of 1 is transmitted through the same uplink subframe (uplink subframe having the subframe index of 0).
- a downlink subframe having a subframe index of 3 and a downlink subframe having a subframe index of 4 may be included in one zone (access zone or relay zone). This is because feedback on the downlink subframe having the subframe index of 3 and the downlink subframe having the subframe index of 4 are transmitted through the same uplink subframe (uplink subframe having the subframe index of 2).
- the 0th and 1st downlink subframe and the 0th uplink subframe are allocated to the same zone (for example, an access zone), and the 3rd and 4th downlink subframe and the 2nd uplink subframe.
- Frames are preferably assigned to the same zone (e.g., relay zone). If the TDD frame is configured according to the above description, it may be as shown in Table 5 below.
- AAI DL Access Zone AAI DL Relay Zone: AAI UL Access Zone: AAI UL Relay Zone: Example 1 3: 2 2: 1 Example 2 2: 3 1: 2
- an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink subframe having a subframe index of zero.
- an uplink subframe (shown as 1 ') corresponding to a downlink subframe (shown as 1) having a subframe index of 1 and a downlink subframe (shown as 2) having a subframe index of 2 are shown.
- the corresponding uplink subframe (shown as 2 ') is an uplink subframe having a subframe index of zero.
- an uplink subframe (shown as 3 ') corresponding to a downlink subframe (shown as 3) having a subframe index of 3 is an uplink subframe having a subframe index of 1.
- an uplink subframe (shown as 4 ') and a downlink subframe (shown as 5) corresponding to a downlink subframe (shown as 4) having a subframe index of 4 are represented.
- the corresponding uplink subframe (shown as 5 ') is determined as an uplink subframe having a subframe index of 1 in the i + 1th frame.
- both a downlink subframe having a subframe index of 0, a downlink subframe having a subframe index of 1 and a downlink subframe having a subframe index of 2 are all in one zone (access zone or relay zone). ) May be included. This is because the feedback for the three downlink subframes described above is transmitted through the same uplink subframe (uplink subframe having a subframe index of 0).
- both a downlink subframe having a subframe index of 3, a downlink subframe having a subframe index of 4, and a downlink subframe having a subframe index of 5 may be included in one zone (access zone or relay zone). . This is because the feedback for the three downlink subframes described above is transmitted through the same uplink subframe (uplink subframe having a subframe index of 1).
- Table 7 When the above condition is satisfied, it may be expressed as shown in Table 7 below.
- AAI DL Access Zone AAI DL Relay Zone: AAI UL Access Zone: AAI UL Relay Zone: Example 3 3: 3 1: 1
- an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink subframe having a subframe index of zero.
- an uplink subframe (shown as 1 ') corresponding to a downlink subframe (shown as 1) having a subframe index of 1 is an uplink subframe having a subframe index of 0.
- an uplink subframe (shown as 2 ') corresponding to a downlink subframe (shown as 2) having a subframe index of 2 is an uplink subframe having a subframe index of 1.
- an uplink subframe (shown as 3 ') corresponding to a downlink subframe (shown as 3) having a subframe index of 3 and a downlink subframe (shown as 4) having a subframe index of 4 are shown.
- the corresponding uplink subframe (shown as 4 ') is defined as an uplink subframe having a subframe index of 1 in the i + 1th frame.
- both a downlink subframe having a subframe index of 0 and a downlink subframe having a subframe index of 1 may be included in one zone (access zone or relay zone). This is because the feedback for the two downlink subframes described above is transmitted through the same uplink subframe (uplink subframe having a subframe index of 0).
- both a downlink subframe having a subframe index of 2, a downlink subframe having a subframe index of 3, and a downlink subframe having a subframe index of 4 may be included in one zone (access zone or relay zone). .
- the feedback for the three downlink subframes described above is transmitted through the same uplink subframe (uplink subframe having a subframe index of 1).
- AAI DL Access Zone AAI DL Relay Zone: AAI UL Access Zone: AAI UL Relay Zone: Example 4 2: 3 1: 1
- FIG. 13 shows an example in which a ratio of subframes allocated to downlink and uplink is 4: 3.
- an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink subframe having a subframe index of zero.
- an uplink subframe (shown as 1 ') corresponding to a downlink subframe (shown as 1) having a subframe index of 1 is an uplink subframe having a subframe index of 1.
- an uplink subframe (shown as 2 ') corresponding to a downlink subframe (shown as 2) having a subframe index of 2 is an uplink subframe having a subframe index of 2.
- an uplink subframe (shown as 3 ') corresponding to a downlink subframe (shown as 3) having a subframe index of 3 is an uplink subframe having a subframe index of 2 in the i + 1th frame. It is decided.
- both a downlink subframe having a subframe index of 2 and a downlink subframe having a subframe index of 3 may be included in one zone (access zone or relay zone). This is because the feedback for the two downlink subframes described above is transmitted through the same uplink subframe (uplink subframe having a subframe index of 2).
- uplink subframe having a subframe index of 2 When the above condition is satisfied, it may be expressed as shown in Table 11 below.
- AAI DL Access Zone AAI DL Relay Zone: AAI UL Access Zone: AAI UL Relay Zone: Example 5 2: 2 2: 1 Example 6 1: 3 1: 2
- the access zone and the relay zone may be distinguished in consideration of HARQ timing.
- Table 13 An example of the TDD frame described above is summarized in Table 13 below.
- AAI DL Access Zone AAI DL Relay Zone: AAI UL Access Zone: AAI UL Relay Zone: Example 1 3: 2 2: 1 Example 2 2: 3 1: 2 Example 3 3: 3 1: 1 Example 4 2: 3 1: 1 Example 5 2: 2 2: 1 Example 6 1: 3 1: 2
- the TDD frame may be configured by only some of the examples disclosed in Table 13.
- the second embodiment describes an example in which HARQ technique is applied when an FDD frame is used.
- the second embodiment determines HARQ timing based on the number of subframes included in the access zone and the number of subframes included in the relay zone, unlike the conventional HARQ scheme in which the access zone / relay zone is not considered. An example is given.
- timing when downlink HARQ timing is determined for an FDD frame, timing may be determined according to Table 14 below.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which an A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in DL indicates a downlink
- HARQ feedback in UL indicates a timing at which a transmitted HARQ subpacket is transmitted
- HARQ feedback in UL indicates a timing at which ACK / NACK feedback for the HARQ subpacket is transmitted in an uplink.
- floor () and ceil () represent the floor and ceil functions, and mod represents the modulo operation.
- L and m in Table 14 represent variables for indicating the index of a subframe. Specifically, l and m represent subframe indexes in an access zone or a relay zone. That is, when the corresponding HARQ timing is determined in the access zone, l and m represent subframe indexes in the access zone. In addition, when the corresponding HARQ timing is determined in the relay zone, l and m represent subframe indexes in the relay zone. Table i shows the index of the frame.
- F 'used in Table 14 indicates the number of subframes (uplink or downlink) included in one FDD frame.
- U in Table 14 represents the number of uplink subframes included in an access zone or a relay zone. Specifically, U indicates the number of uplink subframes included in the access zone when HARQ timing in the access zone is determined, and indicates the number of uplink subframes included in the relay zone when the relay zone is determined. .
- the HARQ technique may be appropriately operated even if the access zone and the relay zone are included in the frame.
- Z used in Table 14 is a downlink HARQ feedback offset, which is defined as in Equation 7 below.
- 14 is a diagram illustrating an example in which HARQ timing is determined according to the second embodiment. 14 is an example in which a processing time is set to three. As shown, an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink having a subframe index of 0 in the i + 2th frame. It is determined as a subframe.
- FIG. 15 is a diagram illustrating still another example in which HARQ timing is determined according to the second embodiment. 15 is an example in which a processing time is set to three. As shown, an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is determined as an uplink subframe having a subframe index of 0.
- 14 to 15 relate to an example in which an access zone is set first and a relay zone is set later, but the order of the access zone and the relay zone may be changed.
- An example in which the order of the access zone and the relay zone is changed in the uplink frame of FIG. 15 may be the same as that of FIG. 16.
- Table 15 In the case of determining the uplink HARQ timing for the FDD frame according to the second embodiment, Table 15 may be followed.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which an A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in UL indicates uplink.
- the HARQ subpacket to be transmitted is indicated by the timing of transmission
- “HARQ feedback in DL” indicates the timing when the ACK / NACK feedback for the HARQ subpacket is transmitted in the downlink.
- HARQ Subpacket ReTx in UL indicates a timing at which a corresponding HARQ subpacket is retransmitted when NACK feedback is transmitted.
- j, k, and p are variables for indicating a frame index
- v denotes an UL HARQ transmission offset
- w denotes an UL HARQ feedback offset.
- v and w are defined as in Equations 8-9.
- F 'used in Table 15 indicates the number of subframes (uplink or downlink) included in one FDD frame
- U in Table 15 indicates the number of uplink subframes included in the access zone or relay zone
- D represents the number of downlink subframes included in the access zone or the relay zone.
- U and D indicate the number of uplink subframes included in the access zone when the HARQ timing of the access zone is determined, and is included in the relay zone when the HARQ timing of the relay zone is determined. This indicates the number of uplink subframes.
- the HARQ timing according to Table 15 is determined based on the number of subframes included in the access zone and the relay zone, the HARQ scheme may be appropriately operated even if the access zone and the relay zone are included in the frame.
- Is set to 1 when transmitted in the default TTI, and is set to the number of subframes spanned by the long TTI when transmitted in the long TTI. For example, it can be set to 4 or U.
- the third embodiment presents another example in which HARQ technique is applied when an FDD frame is used.
- the third embodiment determines the HARQ timing based on the number of subframes allocated to the access zone and the number of subframes allocated to the relay zone, unlike the conventional HARQ scheme without considering the access zone / relay zone. An example is given.
- the third embodiment proposes a method of applying the HARQ timing applied to the TDD frame to the FDD frame according to Tables 3 to 4.
- the default time delay for calculating the HARQ feedback offset z is set to the subframe allocated for the downlink as shown in FIG. It is decided by the number D.
- the default time delay in the access zone is F ′ (downlink and uplink subframes included in the FDD frame, as shown in FIG. 18). Can be set to).
- the default time delay in the relay zone may be determined as D + (F′-U) as shown in FIG. 19.
- Each of D and U represents the number of downlink subframes and uplink subframes included in the relay zone. Reflecting the default time delays according to FIGS. 18 and 19 in Tables 3 to 4, HARQ timing applicable to the FDD frame can be determined.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which an A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in DL indicates a downlink
- HARQ feedback in UL indicates a timing at which a transmitted HARQ subpacket is transmitted
- HARQ feedback in UL indicates a timing at which ACK / NACK feedback for the HARQ subpacket is transmitted in an uplink.
- l and m represent variables for indicating the subframe index in the access zone or relay zone
- i represents a variable for indicating the index of the frame.
- F 'used in Table 16 indicates the number of subframes (uplink or downlink) included in one FDD frame
- U in Table 16 indicates the number of uplink subframes included in the access zone or relay zone
- D denotes the number of downlink subframes included in the access zone or the relay zone.
- Z used in Table 16 is a downlink HARQ feedback offset and is defined as in Equation 10 below.
- L is a default time delay for defining HARQ feedback offset.
- the default time delay is determined as shown in Figs. In addition, it is determined as shown in Equation 11 below.
- 20 is a diagram illustrating an example in which HARQ timing is determined according to a third embodiment.
- 20 is an example in which a processing time is set to three.
- an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink having a subframe index of 1 in the i + 1 th frame. It is determined as a subframe.
- 20 illustrates an example in which an access zone is set first and a relay zone is set later, but the order of the access zone and the relay zone may be changed. That is, in a downlink frame (or uplink frame), a relay zone may be formed first and an access zone may be formed later.
- 21 is a diagram illustrating still another example in which HARQ timing is determined according to the third embodiment.
- 21 is an example in which a processing time is set to three.
- an uplink subframe (shown as 0 ') corresponding to a downlink subframe (shown as 0) having a subframe index of 0 is an uplink having a subframe index of 0 in the i + 1th frame. It is determined as a subframe.
- 21 relates to an example in which the access zone is set first and the relay zone is set later, but the order of the access zone and the relay zone may be changed.
- Table 17 In the case of determining the uplink HARQ timing in the FDD frame according to the third embodiment, Table 17 may be followed.
- Base Assignment A-MAP IE Tx in DL indicates a timing at which an A-MAP IE including information on radio resource allocation is transmitted in downlink
- HARQ Subpacket Tx in UL indicates uplink.
- the HARQ subpacket to be transmitted is indicated by the timing of transmission
- “HARQ feedback in DL” indicates the timing when the ACK / NACK feedback for the HARQ subpacket is transmitted in the downlink.
- HARQ Subpacket ReTx in UL indicates a timing at which a corresponding HARQ subpacket is retransmitted when NACK feedback is transmitted.
- j, k, and p are variables for indicating a frame index
- v denotes an UL HARQ transmission offset
- w denotes an UL HARQ feedback offset.
- v and w are defined as in the following equations (12) to (13).
- L is a default time delay for defining an uplink HARQ transmission offset. L may be determined as in Equation 14 below.
- M is a default time delay for defining an uplink HARQ feedback offset. M may be determined as in Equation 15 below.
- F 'used in Equations 14 to 15 indicates the number of subframes (uplink or downlink) included in one FDD frame
- U in Table 17 indicates the number of uplink subframes included in the access zone or relay zone
- D in Table 17 represents the number of downlink subframes included in the access zone or the relay zone.
- the fourth embodiment configures a frame based on a technique in which a subframe for a first system and a subframe for a second system are multiplexed in one frame to determine HARQ timing in a frame including an access zone and a relay zone. Suggest how to.
- the frame configured according to the fourth embodiment may be a TDD frame.
- the first system may be an IEEE 802.16e system that performs communication in units of OFDMA symbols instead of subframes.
- the second system may be an IEEE 802.16m system that performs communication in subframe units including a plurality of OFDMA symbols.
- a legacy support mode (legacy) supporting not only a terminal belonging to the IEEE 802.16m system (hereinafter referred to as "16m terminal") but also a terminal belonging to the IEEE 802.16e system (hereinafter referred to as "16e terminal"). support mode).
- the IEEE 802.16m system may be referred to as an Advanced Air Interface (AAI) system
- the IEEE 802.16e system may be referred to as a WirelessMAN-OFDA system or a legacy system.
- the frame structure of FIG. 22 shows an example of a frame structure for supporting terminals belonging to two different systems.
- the frame structure of FIG. 22 supports UL Partially Used Sub-Carrier (MU PUSC) permutation in the legacy support mode, and a TDD frame when the legacy area and the AAI area are multiplexed in a frequency division multiplexing (FDM) scheme in uplink.
- MU PUSC Partially Used Sub-Carrier
- FDM frequency division multiplexing
- a frame includes a downlink (DL) subframe and an uplink (UL) subframe.
- the downlink subframe is temporally ahead of the uplink subframe.
- the downlink subframe starts with a preamble, a frame control header (FCH), a downlink (DL) -MAP, an uplink (MAP) -MAP, and a burst region.
- the uplink subframe includes an uplink control channel such as a ranging channel and a feedback channel, a burst region, and the like.
- a guard time for distinguishing the downlink subframe and the uplink subframe is inserted in the middle part (between the downlink subframe and the uplink subframe) and the last part (after the uplink subframe) of the frame.
- Transmit / Receive Transition Gap is a gap between a downlink burst and a subsequent uplink burst.
- Receive / Transmit Transition Gap is a gap between an uplink burst and a subsequent downlink burst.
- the downlink region and the uplink region are divided into an area for a 16e terminal and an area for a 16m terminal.
- the preamble, the FCH, the DL-MAP, the UL-MAP, and the downlink burst region are regions for the 16e terminal, and the remaining downlink regions are regions for the 16m terminal.
- the uplink control channel and the uplink burst region are regions for the 16e terminal, and the remaining uplink regions are regions for the 16m terminal.
- the region for the 16e terminal and the region for the 16m terminal may be multiplexed in various ways.
- the uplink region is multiplexed by the FDM scheme, but is not limited thereto.
- the uplink region may be multiplexed by the TDM scheme.
- a subcarrier group including a plurality of subcarriers is allocated to the legacy region.
- Another subchannel including the remaining plurality of subcarriers is allocated to the AAI region by forming an uplink subframe. If the bandwidth is one of 5, 7, 10 or 20 MHz, all uplink subframes become Type 1 subframes. That is, it includes six OFDMA symbols.
- the bandwidth is 8.75 MHz, the first uplink subframe is a type-1 subframe, and the remaining subframes are type-4 subframes.
- the control channel and burst for the terminals may be scheduled in the subchannels in the legacy region or in the subchannels in the AAI region depending on the mode in which the terminals are connected to the base station.
- subchannels in the legacy region and subchannels in the AAI region are not scheduled in the same frame.
- the legacy region and the AAI region are multiplexed by the FDM scheme, but this is multiplexed by the FDM scheme on the logical subchannel index, and may be mixed with each other in the frequency domain on the physical subchannel index. .
- the preamble is used for initial synchronization, cell search, frequency offset, and channel estimation between the base station and the terminal.
- the FCH includes the length of the DL-MAP message and the coding scheme information of the DL-MAP.
- DL-MAP is an area where a DL-MAP message is transmitted.
- the DL-MAP message defines access to the downlink channel. This means that the DL-MAP message defines the indication and / or control information for the downlink channel.
- the DL-MAP message includes a configuration change count of the downlink channel descriptor (DDC) and a base station identifier (ID). DCD describes a downlink burst profile applied to the current map.
- DDC downlink channel descriptor
- ID base station identifier
- the downlink burst profile refers to a characteristic of a downlink physical channel, and the DCD is periodically transmitted by the base station through a DCD message.
- the UL-MAP is an area in which the UL-MAP message is transmitted.
- the UL-MAP message defines a connection to an uplink channel. This means that the UL-MAP message defines the indication and / or control information for the uplink channel.
- the UL-MAP message includes a configuration change count of an uplink channel descriptor (UCD) and an allocation start time of uplink allocation defined by UL-MAP.
- UCD describes an uplink burst profile.
- the uplink burst profile refers to characteristics of an uplink physical channel, and the UCD is periodically transmitted by the base station through a UCD message.
- the downlink burst is an area in which data transmitted from the base station to the terminal is transmitted
- the uplink burst is an area in which data transmitted from the base station to the terminal is transmitted.
- the fast feedback region is included in an uplink burst region of an OFDM frame.
- the fast feedback area is used for transmission of information requiring a fast response from the base station.
- the fast feedback region may be used for CQI transmission.
- the position of the fast feedback region is determined by UL-MAP.
- the position of the fast feedback region may be a fixed position within the OFDM frame or may be a variable position.
- FIG. 23 simplifies the structure of a frame according to FIG. 22 based on subframes.
- a downlink / uplink zone for 802.16e and a downlink / uplink zone for 802.16m may be multiplexed in one frame.
- FIG. 24 shows an example in which an uplink region of the frame of FIG. 23 is multiplexed using the TDM scheme.
- the uplink region of the frame supporting both the 16e terminal and the 16m terminal may be multiplexed by the TDM scheme.
- the frame according to FIG. 24 may be simplified based on a subframe as shown in FIG. 25.
- FIG. 26 is an example of a TDD frame including an access zone and a relay zone according to the fourth embodiment.
- the example of FIG. 26 is an example of determining the structures of the access zone and the relay zone included in one frame based on the structure of FIG. 25.
- the subframe for the 16e terminal may correspond to the access zone
- the subframe for the 16m terminal may correspond to the relay zone. It is also possible that the subframe for the 16e terminal corresponds to the relay zone and the subframe for the 16m terminal corresponds to the access zone.
- a method for determining HARQ timing according to Tables 3 to 4 with respect to a frame supporting both a 16e terminal and a 16m terminal may refer to 16.2.14.2.2.3 of IEEE P802.16m / D3.
- the general contents of 16.2.14.2.2.3 of IEEE P802.16m / D3 are as follows.
- FIG. 27 illustrates an example of adjusting a subframe index for a frame supporting both a 16e terminal and a 16m terminal. As shown, the subframe index for the frame supporting both the 16e terminal and the 16m terminal is adjusted according to the frame offset.
- 27 shows an example in which uplink is multiplexed by the FDM scheme, if the uplink is multiplexed by the TDM scheme, the frame offset should be considered even in the uplink.
- FIG. 27 for convenience of description.
- the UL HARQ feedback offset w used in 6 is determined by l ', m' and n ', which are subframe indexes according to FIG. 27.
- the downlink HARQ feedback offset z may be determined as shown in Equation 16 instead of Equation 4.
- v which is an UL HARQ transmission offset, may be determined by Equation 17 instead of Equation 5.
- w which is an UL HARQ feedback offset, may be determined by Equation 18 instead of Equation 6.
- the first to fourth embodiments described above may be embodied in various communication devices.
- the relay station 2800 includes a processor 2810, a memory 2830, and an RF unit 2820.
- the processor 2810 may allocate radio resources according to information provided from the outside, information previously stored therein, and the like. The procedures, techniques, and functions performed by the RS among the above-described embodiments may be implemented by the processor 2810.
- the memory 2830 is connected to the processor 2810 and stores various information for driving the processor 2810.
- the RF unit 2820 is connected to the processor 2810 and transmits and / or receives a radio signal.
- the terminal or base station communicating with the relay station includes a processor 2910, a memory 2920, and an RF unit 2930.
- the procedure, technique, and function performed by the terminal / base station may be implemented by the processor 2910.
- the memory 2920 is connected to the processor 2910 and stores various information for driving the processor 2910.
- the RF unit 2930 is connected to the processor 2910 to transmit and / or receive a radio signal.
- Processors 2810 and 2910 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memories 2820 and 2920 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the RF unit 2830 and 2930 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. Modules may be stored in memories 2820 and 2920 and executed by processors 2810 and 2910.
- the memories 2820 and 2920 may be internal or external to the processors 2810 and 2910 and may be connected to the processors 2810 and 2910 by various well-known means.
- the invention can be implemented in hardware, software or a combination thereof.
- an application specific integrated circuit ASIC
- DSP digital signal processing
- PLD programmable logic device
- FPGA field programmable gate array
- the module may be implemented as a module that performs the above-described function.
- the software may be stored in a memory unit and executed by a processor.
- the memory unit or processor may employ various means well known to those skilled in the art.
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Abstract
Description
Subframe index | 0 (DL) | 1 (DL) | 2 (DL) | 3 (DL) | 4 (DL) | 0 (UL) | 1 (UL) | 2 (UL) |
Example 1 | Access | Access | Access | Relay | Relay | Access | Access | Relay |
Example 2 | Access | Access | Relay | Relay | Relay | Access | Relay | Relay |
AAI DL Access Zone: AAI DL Relay Zone: | AAI UL Access Zone: AAI UL Relay Zone: | |
Example 1 | 3:2 | 2:1 |
Example 2 | 2:3 | 1:2 |
Subframe index | 0 (DL) | 1 (DL) | 2 (DL) | 3 (DL) | 4 (DL) | 5 (UL) | 0 (UL) | 1 (UL) |
Example 3 | Access | Access | Access | Relay | Relay | Relay | Access | Relay |
AAI DL Access Zone: AAI DL Relay Zone: | AAI UL Access Zone: AAI UL Relay Zone: | |
Example 3 | 3:3 | 1:1 |
Subframe index | 0 (DL) | 1 (DL) | 2 (DL) | 3 (DL) | 4 (DL) | 0 (UL) | 1 (UL) |
Example 4 | Access | Access | Relay | Relay | Relay | Access | Relay |
AAI DL Access Zone: AAI DL Relay Zone: | AAI UL Access Zone: AAI UL Relay Zone: | |
Example 4 | 2:3 | 1:1 |
Subframe index | 0 (DL) | 1 (DL) | 2 (DL) | 3 (DL) | 0 (UL) | 1 (UL) | 2 (UL) |
Example 5 | Access | Access | Relay | Relay | Access | Access | Relay |
Example 6 | Access | Relay | Relay | Relay | Access | Relay | Relay |
AAI DL Access Zone: AAI DL Relay Zone: | AAI UL Access Zone: AAI UL Relay Zone: | |
Example 5 | 2:2 | 2:1 |
Example 6 | 1:3 | 1:2 |
AAI DL Access Zone: AAI DL Relay Zone: | AAI UL Access Zone: AAI UL Relay Zone: | |
Example 1 | 3:2 | 2:1 |
Example 2 | 2:3 | 1:2 |
Example 3 | 3:3 | 1:1 |
Example 4 | 2:3 | 1:1 |
Example 5 | 2:2 | 2:1 |
Example 6 | 1:3 | 1:2 |
Claims (20)
- 중계국(relay station)을 포함하는 무선통신 시스템에서 프레임을 통해 단말 및 기지국과 통신하는 방법에 있어서,복수의 하향링크 서브프레임과 복수의 상향링크 서브프레임을 포함하는 TDD 프레임을 구성하는 단계;상기 TDD 프레임을 통해 단말 및 기지국 중 적어도 어느 하나와 통신하는 단계를 포함하되,상기 하향링크 서브프레임 중 제1 개수의 서브프레임과 상기 상향링크 서브프레임 중 제2 개수의 서브프레임은 상기 단말을 위한 엑세스 존에 할당되고, 상기 하향링크 서브프레임 중 제3 개수의 서브프레임과 상기 상향링크 서브프레임 중 제4 개수의 서브프레임은 상기 기지국을 위한 릴레이 존에 할당되고, 상기 제1 개수 내지 제4 개수는 기설정되는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제1항에 있어서,하나의 프레임 내에서 상기 릴레이 존은 상기 엑세스 존에 뒤이어지고,상기 제1 개수의 서브프레임은 상기 하향링크 서브프레임 중 최초로 전송되는 적어도 하나의 서브프레임이고, 상기 제2 개수의 서브프레임은 상기 상향링크 서브프레임 중 최초로 전송되는 적어도 하나의 서브프레임이고, 상기 제3 개수의 서브프레임은 상기 하향링크 서브프레임 중 최후에 전송되는 적어도 하나의 서브프레임이고, 상기 제4 개수의 서브프레임은 상기 상향링크 서브프레임 중 최후에 전송되는 적어도 하나의 서브프레임인프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제1항에 있어서,상기 엑세스 존에 할당되는 제1 개수의 서브프레임 및 제3 개수의 서브프레임은 HARQ 타이밍을 기초로 결정되는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제3항에 있어서,상기 제1 개수의 서브프레임 중 적어도 어느 하나의 서브프레임을 통해 HARQ 서브패킷이 송신되고, 상기 제3 개수의 서브프레임 중 어느 하나의 서브프레임을 통해 상기 HARQ 서브패킷에 상응하는 ACK/NACK 신호가 송신되는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제1항에 있어서,상기 릴레이 존에 할당되는 제2 개수의 서브프레임 및 제4 개수의 서브프레임은 HARQ 타이밍을 기초로 결정되는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제5항에 있어서,상기 제2 개수의 서브프레임 중 적어도 어느 하나의 서브프레임을 통해 HARQ 서브패킷이 송신되고, 상기 제4 개수의 서브프레임 중 어느 하나의 서브프레임을 통해 상기 HARQ 서브패킷에 상응하는 ACK/NACK 신호가 송신되는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제1항에 있어서,상기 상향링크 서브프레임 및 상기 하향링크 서브프레임 간의 비율이 5:3인 경우, 상기 하향링크 서브프레임 중 상기 엑세스 존을 위한 서브프레임, 상기 하향링크 서브프레임 중 상기 릴레이 존을 위한 서브프레임, 상기 상향링크 서브프레임 중 상기 엑세스 존을 위한 서브프레임 및 상기 상향링크 서브프레임 중 상기 릴레이 존을 위한 서브프레임은 간의 비율은, 3:2:2:1 또는 2:3:1:2인프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제1항에 있어서,상기 제1 개수 내지 제4 개수 중 적어도 두 개는 동일하게 정해지는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 단말 및 기지국 중 적어도 어느 하나와 통신하는 중계국(relay station)에서 ACK/NACK 신호를 위한 데이터 처리 방법에 있어서,상기 단말 및 기지국 중 적어도 어느 하나와의 통신에 사용되는 데이터를 위한 무선자원을 결정하는 단계 및상기 데이터에 상응하는 ACK/NACK 신호를 위한 무선자원을 결정하는 단계를 포함하되,상기 데이터 및 ACK/NACK 신호는 다수의 서브프레임을 포함하는 상향링크 프레임과 하향링크 프레임을 통해 송신되고, 상기 상향링크 프레임 및 하향링크 프레임 각각은 상기 단말을 위한 엑세스 존 및 상기 기지국을 위한 릴레이 존을 포함하고, 상기 데이터 및 ACK/NACK 신호 중 적어도 어느 하나를 위한 무선자원은 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 서브프레임의 개수를 기초로 결정되는ACK/NACK 신호를 위한 데이터 처리 방법.
- 제9항에 있어서,상기 상향링크 프레임이 송신되는 주파수는 상기 하향링크 프레임이 송신되는 주파수와 상이한ACK/NACK 신호를 위한 데이터 처리 방법.
- 제9항에 있어서,상기 데이터는 상기 하향링크 프레임에 포함되는 적어도 하나의 하향링크 서브프레임을 통해 송신되고,상기 ACK/NACK 신호는 상기 상향링크 프레임에 포함되는 상향링크 서브프레임을 통해 송신되고,상기 ACK/NACK 신호가 송신되는 프레임의 인덱스와 상기 ACK/NACK 신호가 송신되는 서브프레임의 인덱스 각각은 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 상향링크 서브프레임의 개수를 기초로 결정되는ACK/NACK 신호를 위한 데이터 처리 방법.
- 제9항에 있어서,상기 데이터는 상기 상향링크 프레임에 포함되는 적어도 하나의 상향링크 서브프레임을 통해 송신되고,상기 ACK/NACK 신호는 상기 하향링크 프레임에 포함되는 하향링크 서브프레임을 통해 송신되고,상기 데이터가 송신되는 프레임의 인덱스와 상기 데이터가 송신되는 서브프레임의 인덱스 각각은 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 상향링크 서브프레임의 개수를 기초로 결정되고,상기 ACK/NACK 신호가 송신되는 프레임의 인덱스는 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 하향링크 서브프레임의 개수를 기초로 결정되는ACK/NACK 신호를 위한 데이터 처리 방법.
- 제9항에 있어서,상기 데이터는 상기 하향링크 프레임에 포함되는 적어도 하나의 하향링크 서브프레임을 통해 송신되고,상기 ACK/NACK 신호는 상향링크 프레임에 포함되는 상향링크 서브프레임을 통해 송신되고,상기 ACK/NACK 신호가 송신되는 프레임의 인덱스와 상기 ACK/NACK 신호가 송신되는 서브프레임의 인덱스 각각은 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 상향링크 서브프레임의 개수, 및 상기 엑세스 존 또는 릴레이 존에 포함되는 하향링크 서브프레임의 개수를 기초로 결정되는ACK/NACK 신호를 위한 데이터 처리 방법.
- 제9항에 있어서,상기 데이터는 상기 상향링크 프레임에 포함되는 적어도 하나의 상향링크 프레임을 통해 송신되고,상기 ACK/NACK 신호는 상기 하향링크 프레임에 포함되는 하향링크 서브프레임을 통해 송신되고,상기 데이터가 송신되는 프레임의 인덱스와 상기 데이터가 송신되는 서브프레임의 인덱스 각각은 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 상향링크 서브프레임, 및 상기 엑세스 존 또는 릴레이 존에 포함되는 하향링크 서브프레임의 개수를 기초로 결정되고,상기 ACK/NACK 신호가 송신되는 프레임의 인덱스는 적어도 상기 엑세스 존 또는 릴레이 존에 포함되는 상향링크 서브프레임의 개수, 및 상기 엑세스 존 또는 릴레이 존에 포함되는 하향링크 서브프레임의 개수를 기초로 결정되는ACK/NACK 신호를 위한 데이터 처리 방법.
- 제9항에 있어서,상기 서브프레임 각각은 복수의 OFDMA 심볼을 포함하는ACK/NACK 신호를 위한 데이터 처리 방법.
- 중계국(relay station)을 포함하는 무선통신 시스템에서 프레임을 통해 단말 및 기지국과 통신하는 방법에 있어서,하나의 프레임에 포함되는 제1 시스템을 위한 서브프레임과 제2 시스템을 위한 서브프레임을 기초로 엑세스 존과 릴레이 존을 다중화하여 하나의 프레임을 구성하는 단계;상기 엑세스 존과 릴레이 존을 포함하는 프레임을 통하여 단말 및 기지국 중 적어도 어느 하나와 통신하는 단계를 포함하되,상기 제1 시스템을 위한 서브프레임 및 제2 시스템을 위한 서브프레임 각각은 하향링크 서브프레임과 상향링크 서브프레임을 포함하고, 상기 엑세스 존 및 릴레이 존 각각은 하향링크 서브프레임과 상향링크 서브프레임을 포함하는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제16항에 있어서,상기 제1 시스템은 IEEE(Institute of Electrical and Electronics Engineers) 802.16e 시스템이며,상기 제2 시스템은 IEEE 802.16m 시스템인프레임을 통해 단말 및 기지국과 통신하는 방법.
- 16항에 있어서,상기 제1 시스템을 위한 서브프레임과 제2 시스템을 위한 서브프레임을 포함하는 프레임에는 상기 제1 시스템을 위한 서브프레임과 제2 시스템을 위한 서브프레임이 TDM 기법으로 다중화되는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제16항에 있어서,상기 제1 시스템을 위한 서브프레임 중 하향링크 서브프레임은 하향링크 엑세스 존에 상응하고, 상기 제2 시스템을 위한 서브프레임 중 하향링크 서브프레임은 하향링크 릴레이 존에 상응하고, 상기 제1 시스템을 위한 서브프레임 중 상향링크 서브프레임은 상향링크 엑세스 존에 상응하고, 상기 제2 시스템을 위한 서브프레임 중 상향링크 서브프레임은 상향링크 릴레이 존에 상응하는프레임을 통해 단말 및 기지국과 통신하는 방법.
- 제16항에 있어서,상기 제1 시스템을 위한 서브프레임 및 제2 시스템을 위한 서브프레임의 구조를 기초로 HARQ 타이밍을 결정하는 단계를 더 포함하는프레임을 통해 단말 및 기지국과 통신하는 방법.
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US29131809P | 2009-12-30 | 2009-12-30 | |
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KR1020100128178A KR101729783B1 (ko) | 2009-12-18 | 2010-12-15 | 중계국을 포함하는 통신 시스템에서 프레임을 통해 단말 및 기지국과 통신하는 방법 및 장치 |
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KR20140042416A (ko) * | 2012-09-28 | 2014-04-07 | 삼성전자주식회사 | 이동 통신 시스템에서 데이터 송수신 방법 및 장치 |
CN104579607A (zh) * | 2013-10-10 | 2015-04-29 | 华为技术有限公司 | 一种时分双工系统的通信方法和装置 |
WO2015178640A1 (ko) * | 2014-05-18 | 2015-11-26 | 엘지전자 주식회사 | Fdr 전송을 지원하는 무선접속시스템에서 피드백 정보를 송수신하는 방법 및 장치 |
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CN109687938B (zh) * | 2018-11-19 | 2022-03-25 | 京信网络系统股份有限公司 | 应用于直放站中的帧数据处理方法、装置和计算机设备 |
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