WO2017077388A1 - Procédé et appareil de configuration d'une sous-trame initiale pour une transmission de données en rafales dl - Google Patents

Procédé et appareil de configuration d'une sous-trame initiale pour une transmission de données en rafales dl Download PDF

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Publication number
WO2017077388A1
WO2017077388A1 PCT/IB2016/001712 IB2016001712W WO2017077388A1 WO 2017077388 A1 WO2017077388 A1 WO 2017077388A1 IB 2016001712 W IB2016001712 W IB 2016001712W WO 2017077388 A1 WO2017077388 A1 WO 2017077388A1
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WIPO (PCT)
Prior art keywords
timeslot
initial subframe
data transmission
burst data
subframe
Prior art date
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PCT/IB2016/001712
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English (en)
Inventor
Jianguo Liu
Feng Han
Yan Meng
Tao Tao
Junrong GU
Sigen Ye
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Alcatel Lucent
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Publication of WO2017077388A1 publication Critical patent/WO2017077388A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio

Definitions

  • the present disclosure generally relates to the field of wireless communication, and more specifically relates to a method and apparatus for configuring an initial subframe for a Downlink (DL) burst data transmission in a base station to support Licensed Assisted Access (LAA).
  • LAA Licensed Assisted Access
  • LAA-LTE Licensed Assisted Access Using Long Term Evolution
  • the LAA-LTE should support transmission of data/control signals on a subset of the Orthogonal Frequency Division Multiplexing (OFDM) symbols in a DL subframe (i.e., partial Transmission Time Interval (Partial TTI)) (see bibliography [2]).
  • OFDM Orthogonal Frequency Division Multiplexing
  • Partial TTI partial Transmission Time Interval
  • WF Rl-152222 see bibliography [2]
  • the ending positions of the burst data transmission may also be flexible so as to fully utilize the channel resources.
  • DwPTS Downlink Pilot Timeslot
  • the present disclosure provides a framework design for an initial subframe of a DL burst data transmission.
  • a method for configuring an initial subframe of a DL burst data transmission in a base station to support LAA includes transmitting a CRS at at least a first OFDM symbol in the initial subframe; and configuring a PDCCH from a first OFDM symbol of a first timeslot of the initial subframe if a starting position of DL burst data transmission is in the first timeslot; or configuring the PDCCH from a first OFDM symbol of a second timeslot of the initial subframe if the starting position of the DL burst data transmission is in the second timeslot.
  • an apparatus for configuring an initial subframe of a DL burst data transmission in a base station to support LAA includes a transmitting unit configured to transmit a CRS at at least a first OFDM symbol in the initial subframe; and a control signaling configuring unit configured to configure a PDCCH from a first OFDM symbol of a first timeslot of the initial subframe if a starting position of the DL burst data transmission is in the first timeslot, or to configure the PDCCH from a first OFDM symbol of a second timeslot of the initial subframe if the starting position of the DL burst data transmission is in the second timeslot.
  • LAA With the initial subframe design for the DL burst data transmission according to the present disclosure, LAA may be supported and a good tradeoff among spectrum efficiency, complexity, and effect on current specifications may be achieved.
  • Fig. 1 illustrates a schematic diagram of two possible frame structures of an initial subframe for a DL burst data transmission according to the present disclosure
  • Fig. 2 illustrates a schematic diagram of an apparatus for configuring an initial subframe for a DL burst data transmission in a base station to support LAA according to the present disclosure.
  • the LBT mechanism enables the base station to sense a channel and accesses the channel when the channel is free. In order to reserve the channel till a transmission boundary (e.g., symbol or subframe boundary), it is needed to transmit a channel reservation signal between an instant when the base station completes the LBT procedure successfully and a starting position for the DL burst data transmission, which will incur overheads and affect the system spectrum efficiency. Particularly, if the Physical Downlink Shared Channel (PDSCH) is only allowed to start transmission from a symbol in a first timeslot, the overheads will be huge in the case of a smaller Maximum Channel Occupancy Time (MCOT). Therefore, as far as spectrum efficiency is concerned, it should be allowed to start PDSCH transmission not only from the first timeslot of the subframe.
  • a transmission boundary e.g., symbol or subframe boundary
  • the PDCCH transmission should start at an OFDM symbol with CRS so as to guarantee a decoding performance.
  • the potential starting positions may be any of symbols ⁇ 0, 4, 7, 11 ⁇ of the subframe (herein, in the case of a normal CP, each subframe includes two timeslots and each timeslot contains 7 symbols; therefore, each subframe includes symbols 0, 1, 2, 13); while for an extended CP case, the potential starting positions may be any one of symbols ⁇ 0, 4, 6, 10 ⁇ of the subframe (herein, in the case of an extended CP, each subframe includes two timeslots and each timeslot contains 6 symbols; therefore, each subframe includes symbols 0, 1, 2, 11).
  • a User Equipment needs to perform blind detection so as to determine a starting position of the DL burst data transmission based on a reference signal (e.g., an initial signal and/or a Common Reference Signal (CRS)). Therefore, it is desirable to restrict candidate starting positions to reduce blind detection complexity.
  • a reference signal e.g., an initial signal and/or a Common Reference Signal (CRS)
  • the candidate starting position for downlink data/control transmission may be configured at a first symbol of a first timeslot or a second timeslot of the subframe. Therefore, the starting positions may be symbols ⁇ 0, 7 ⁇ of the subframe (for a normal CP) or ⁇ 0, 6 ⁇ (for an extended CP).
  • Fig. 1 illustrates a schematic diagram of two possible frame structures of an initial subframe for the DL burst data transmission according to the present disclosure.
  • the base station performs a CCA procedure in the subframe N-l to determine that the channel is in a free state.
  • the CCA procedure ends during a second timeslot of the subframe N-l.
  • the base station transmits a channel reservation signal before a frame boundary between the subframe N-l and the subframe N so as to reserve the channel for the DL burst data transmission.
  • the starting position of the DL burst data transmission is in the first timeslot of the initial subframe (i.e., the subframe N in Fig. 1). More specifically, the starting position starts from symbol 0 of the subframe N so as to transmit data/control information.
  • the CCA procedure of the base station ends during a first timeslot of the subframe K.
  • the base station may configure the second timeslot of the subframe K as the starting position of the DL burst data transmission. Therefore, after the end of the CCA procedure and before the second timeslot of the subframe K, the base station transmits a channel reservation signal so as to reserve the channel for the DL burst data transmission.
  • the starting position may be the first symbol of the second timeslot of the subframe K for transmitting data/control information.
  • this initial subframe is also termed as a full initial subframe.
  • this initial subframe is also termed as a partial initial subframe.
  • an initial signal is configured before the DL burst data transmission.
  • the initial signal may comprise at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Common Reference Signal (CRS), a Dedicated Reference Signal (DRS), and/or a Channel State Information Reference Signal (CSI-RS).
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • CRS Common Reference Signal
  • DRS Dedicated Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • the CRS signal is transmitted at at least a first OFDM symbol in the initial subframe.
  • the base station may configure to transmit the CRS signal on both port 0 and port 1 at the at least first OFDM symbol of the initial subframe such that a UE receiving such a CRS signal can quickly detect the initial subframe for the DL burst data transmission.
  • the partial initial subframe e.g., the starting position of the initial subframe in the subframes is the first symbol of the second timeslot
  • the full initial subframe e.g., the starting position of the initial subframe in the subframes is the first symbol of the first timeslot
  • a similar detection mechanism of the initial subframe may be used.
  • a design based on an effective initial signal can perform a reliable and effective detection of the starting position of the DL burst data transmission.
  • transmission of the initial signal e.g., including PSS/SSS/CRS, etc.
  • AGC Automatic Gain Control
  • Option 2 by detecting the CRS signal on at least a first OFDM symbol of the initial subframe, the complexity of the UE can be greatly reduced and the UE power can be advantageously saved. This is quite helpful for the UE to wake up from a Discontinuous Reception (DRX).
  • DRX Discontinuous Reception
  • the initial subframe configuration in the base station only adopts Option 2 for transmission detection of the initial subframe. For example, if it is not needed to perform AGC and time/frequency synchronization based on the initial signal, it may employ only Option 2.
  • the initial subframe configuration in the base station may employ a combination of Option 1 and Option 2. This may be a case of needing to perform AGC and time/frequency synchronization based on the initial signal.
  • the initial subframe for the DL burst data transmission can also be detected by detecting the CRS signal on the at least first OFDM symbol of the subframe.
  • the PDCCH may be transmitted in first several OFDM symbols of the initial subframe before the scheduled PDSCH.
  • the first 0-3 symbols may be configured for PDCCH transmission in the initial subframe as needed.
  • the base station starts configuring the PDCCH from the first symbol of the first timeslot of the initial subframe.
  • the control channel actually needs no additional design since in the traditional control channel design, symbol 0 is a starting position of the PDCCH/PDSCH transmission in the DL burst data transmission.
  • a self-carrier scheduling mechanism and a cross-carrier scheduling mechanism may be used for the initial subframe.
  • the base station starts configuring the PDCCH from the first symbol of the second timeslot of the initial subframe.
  • the cross-carrier scheduling based on the current subframe cannot be used.
  • the base station starts configuring the EPDCCH from the k th OFDM symbol of the first timeslot of the initial subframe.
  • the base station starts configuring the PDCCH from the k th OFDM symbol of the second timeslot of the initial subframe.
  • the value of k may be configured through a Radio Resource Control (RRC) signaling (e.g., in the EPDCCH-Config information element or other control information elements), or may be indicated based on detection of a Physical HARQ Indicator Channel (PFICH).
  • RRC Radio Resource Control
  • EPDCCH transmission starts after PDCCH, or if the PDCCH does not exist, the EPDCCH transmission starts from the first symbol of the initial subframe.
  • Rel-12 in a special subframe, at least 6 valid symbols in the subframe may support EPDCCH transmission. However, in the initial subframe, 3-7 symbols are needed to support EPDCCH transmission. Supposing an enhanced Resource Element Group (EREG) mapping in a Physical Resource Block (PRB) pair maintains unchanged, similar to Rel-12, in the case of partial initial subframe, the amount of valid Resource Elements (REs) in each enhanced Control Channel Element (ECCE) will be less than the amount of valid REs for normal subframe EPDCCH transmission. To ensure the performance of EPDCCH, the following specific designs for EPDCCH in the initial subframe may be considered.
  • EREG enhanced Resource Element Group
  • PRB Physical Resource Block
  • Solution 1 if the number of valid symbols in the initial subframe for EPDCCH transmission is smaller than a specific value, in the EPDCCH, one PRB pair only has one ECCE therein.
  • the PRB pair has 4 or 2 ECCEs.
  • the number of valid REs becomes less for EPDCCH transmission in the initial subframe, it is recommended in solution 1 that the number of valid symbols in the initial subframe for EPDCCH transmission is less than a specific value, such that the EPDCCH should support that one PRB pair only has one ECCE therein.
  • Solution 2 If the number of valid symbols in the initial subframe for EPDCCH transmission is less than a specific value, a higher aggregation level may be used in EPDCCH.
  • the maximum aggregation level as used may be twice of the conventional maximum aggregation level.
  • the specific value may be a positive integer less than 7, e.g., it may be 6.
  • Transport Block Sizes may be configured for Transport Blocks (TBs) in the two types of frame structures.
  • TBSs Transport Block Sizes
  • the size of the transport block in the initial subframe should be determined before the TB transmission. Further, since the actual length of the initial subframe when the TB is determined is unknown, transport blocks with different TBSs should be prepared in advance for the frame structures I and II.
  • a first TBS is configured for the transport block
  • a second TBS different from the first TBS is configured for the transport block, wherein the second TBS is determined by a scaling factor.
  • the TBS For PDSCH transmission in a normal DL subframe, the TBS is determined based on a resource allocation size (NPRB) and a Modulation Coding Scheme (MCS) index.
  • NPRB resource allocation size
  • MCS Modulation Coding Scheme
  • the TBS may also be adjusted to adapt a scenario with less number of OFDM symbols available for PDSCH so as to provide a more effective DL transmission.
  • TBS adjustment is done by multiplying the NPRB with a factor 0.75.
  • the scaling factor may be determined based on the number of available symbols in the initial subframe.
  • the scaling factor may be set to 5/12.
  • Fig. 2 illustrates a schematic diagram of an apparatus 200 for configuring an initial subframe for the DL burst data transmission in a base station according to the present disclosure.
  • the apparatus 200 comprises a transmitting unit 210 configured to transmit a CRS at at least a first OFDM symbol in the initial subframe; and a control signaling configuring unit 220 configured to configure PDCCH from a first OFDM symbol of a first timeslot of the initial subframe if a starting position of the DL burst data transmission is in the first timeslot, or to configure the PDCCH from a first OFDM symbol of a second timeslot of the initial subframe if the starting position of DL burst data transmission is in the second timeslot.
  • control signaling configuring unit 220 is further configured to configure an initial signal before the DL burst data transmission for AGC and/or time/frequency synchronization.
  • the initial signal includes at least one reference signal of SSS, PSS, CRS, DRS and CSI-RS.
  • the apparatus further comprises a CCA unit 230 configured to perform CCA before the initial subframe so as to determine whether the starting position of the DL burst data transmission is in the first timeslot or the second timeslot of the initial subframe.
  • the control signaling configuring unit 220 configures the EPDCCH from a kth OFDM symbol of the second timeslot, wherein a value of k is indicated to the UE through a RRC signaling or indicated based on PRICH detection.
  • a number of valid symbols in the initial subframe for EPDCCH transmission is smaller than a specific value, a higher aggregation level is used in the EPDCCH.
  • the specific value is a positive integer smaller than 7.
  • a first transport block size is configured for the transport blocks; and if the starting positon of the DL burst data transmission is in the second timeslot of the initial subframe, a second transport block size different from the first transport block size is configured for the transport blocks, wherein the second transport block is determined by a scaling factor.
  • the proposed design for initial subframe for the DL burst data transmission can support
  • the functions of the present application may be implemented using hardware, software, firmware, or any combinations thereof.
  • the functions may be stored on a computer readable medium as one or more instructions or codes, or transmitted as one or more instructions or codes on the computer readable medium.
  • the computer readable medium comprises a computer storage medium and a communication medium.
  • the communication medium includes any medium that facilitates transmission of the computer program from one place to another.
  • the storage medium may be any available medium accessible to a general or specific computer.
  • the computer-readable medium may include, for example, but not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices, or other magnetic storage devices, or any other medium that carries or stores desired program code means in a manner of instructions or data structures accessible by a general or specific computer or a general or specific processor. Furthermore, any connection may also be considered as a computer-readable medium.
  • the co-axial cable, optical cable, twisted pair wire, Digital Subscriber Line (DSL), or radio technologies such as infrared, radio or microwave
  • the co-axial cable, optical cable, twisted pair wire, Digital Subscriber Line (DSL), or radio technologies such as infrared, radio or microwave are also covered by the definition of medium.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any normal processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

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

Abstract

La présente invention concerne un procédé et un appareil de configuration d'une sous-trame initiale pour une transmission de données en rafales DL dans une station de base. Le procédé consiste à : transmettre un CRS à au moins un premier symbole OFDM dans la sous-trame initiale ; et configurer un PDCCH à partir d'un premier symbole OFDM d'un premier intervalle de temps de la sous-trame initiale si une position de départ d'une transmission de données en rafales DL se situe dans le premier intervalle de temps ; ou configurer le PDCCH à partir d'un premier symbole OFDM d'un second intervalle de temps de la sous-trame initiale si la position de départ de la transmission de données en rafales DL se situe dans le second intervalle de temps.
PCT/IB2016/001712 2015-11-06 2016-10-26 Procédé et appareil de configuration d'une sous-trame initiale pour une transmission de données en rafales dl WO2017077388A1 (fr)

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CN201510751101.7A CN106685611B (zh) 2015-11-06 2015-11-06 配置dl突发数据传输的初始子帧的方法和装置
CN201510751101.7 2015-11-06

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