WO2017133010A1 - 一种物理下行信道的传输方法、装置及系统 - Google Patents

一种物理下行信道的传输方法、装置及系统 Download PDF

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Publication number
WO2017133010A1
WO2017133010A1 PCT/CN2016/073703 CN2016073703W WO2017133010A1 WO 2017133010 A1 WO2017133010 A1 WO 2017133010A1 CN 2016073703 W CN2016073703 W CN 2016073703W WO 2017133010 A1 WO2017133010 A1 WO 2017133010A1
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Prior art keywords
subframe
pdcch
nth
downlink subframe
base station
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PCT/CN2016/073703
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English (en)
French (fr)
Inventor
夏金环
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680077561.9A priority Critical patent/CN108432285B/zh
Priority to EP16888834.5A priority patent/EP3393166B1/en
Priority to PCT/CN2016/073703 priority patent/WO2017133010A1/zh
Publication of WO2017133010A1 publication Critical patent/WO2017133010A1/zh
Priority to US16/054,376 priority patent/US20180343091A1/en

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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
    • 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
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for transmitting a physical downlink channel.
  • the physical downlink channel transmitted in each downlink subframe includes a PDCCH (Physical Downlink Control Channel) and a Physical Downlink Shared Channel (PDSCH). Shared channel).
  • the PDCCH carries Scheduling Assignments information and other control information (Control Information) of the PDSCH.
  • the standard bandwidth of the LTE system is 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz, ie megahertz.
  • the minimum bandwidth occupied by the PDCCH when mapped in the frequency domain dimension is the minimum system standard bandwidth, that is, 1.4 MHz.
  • the SC-FDMA Single-Carrier Frequency-Division Multiple Access
  • FDMA Frequency-Division Multiple Access
  • the terminal supports uplink transmission of multiple subcarriers SC-FDMA with orthogonal subcarrier spacing of 15 kHz.
  • NBIOT Nearband-Internet of Thing
  • the terminals supported by the NBIOT may also be embodied as one type of terminal supporting two, two or three different terminal capabilities, namely, the first.
  • the capability is to support FDMA transmission of a single subchannel with an orthogonal subcarrier spacing of 3.75 kHz SC-FDMA transmission or a subchannel bandwidth of 3.75 kHz; the second capability is to support a single subcarrier with an orthogonal subcarrier spacing of 15 kHz. SC-FDMA transmission; the third capability is the transmission of multiple subcarrier SC-FDMAs supporting uplink subcarrier spacing of 15 kHz. In the NBIOT system, the bandwidth of the system is 180 kHz.
  • the PDCCH in the LTE system cannot support transmission in such a narrowband bandwidth. Therefore, there is a need for a new resource mapping method for the physical downlink channel.
  • Embodiments of the present invention provide a method, an apparatus, and a system for transmitting a physical downlink channel, which solve the problem that a PDCCH in an LTE system cannot support transmission in a narrowband bandwidth.
  • a first embodiment of the present invention provides a method for transmitting a physical downlink channel, where a base station transmits a narrowband physical downlink control channel NB- to a user terminal in a downlink pilot time slot DwPTS in an nth downlink subframe or an nth subframe.
  • PDCCH Physical Downlink Control Channel
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource in a frequency domain, and includes an nth downlink sub-subsequence in a time domain.
  • At least one orthogonal frequency division multiplexing OFDM symbol included in a downlink pilot time slot DwPTS in a frame or an nth subframe the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is The frequency resource included in one resource block RB, n ⁇ 1.
  • the NB-PDCCH when the eNB sends the NB-PDCCH to the user terminal, the NB-PDCCH is mapped to the NB-PDCCH mapping basic unit, and the NB-PDCCH mapping basic unit is the first frequency resource whose bandwidth is less than or equal to 180 kHz. Or the frequency resource of a resource block, the bandwidth of the frequency resource of one resource block is 180 kHz. Therefore, in the embodiment of the present invention, the base station maps the NB-PDCCH to a frequency resource whose frequency resource is less than or equal to 180 kHz, and provides the user terminal with the frequency resource. The NB-PDCCH is transmitted. This way The PDCCH is transmitted in the NBIOT system, which solves the problem that the PDCCH cannot be transmitted in the narrowband bandwidth in the prior art.
  • the NB-PDCCH mapping basic unit is composed of a first narrowband control channel unit NB-CCE and/or a second NB-CCE, where the first NB-CCE or the second NB-CCE includes m resource units RE , m>1;
  • the NB-PDCCH is an NB-PDCCH in a first format, where the NB-PDCCH of the first format is sent in m REs;
  • the NB-PDCCH is an NB-PDCCH in a second format, where the NB-PDCCH in the second format is sent in 2*m REs.
  • the m REs are composed of x*y REs, where x represents continuous orthogonal frequency division multiplexing in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • x represents continuous orthogonal frequency division multiplexing in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the number of OFDM symbols, y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the nth downlink subframe or the DwPTS in the nth subframe, x>1, 12 ⁇ y ⁇ 1.
  • the nth downlink subframe or the nth subframe including the DwPTS is used to transmit a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a narrowband secondary synchronization signal NB-SSS a frame, where the x OFDM symbols are the first 3 or the first 5 in the nth downlink subframe in the time domain or all the OFDM symbols in the DwPTS in the nth subframe in the order of time from small to large. Continuous OFDM symbols;
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the first OFDM symbol is up to the last OFDM symbol.
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the p+1th OFDM symbol is up to the last OFDM.
  • the number of consecutive OFDM symbols of the symbol, The p is a preset value, or the p is a value carried by the base station through the NB-PBCH or system information, 4 ⁇ p ⁇ 0.
  • each of the m REs includes consecutive 6 subcarriers, and the first NB-CCE or the first The index of the six subcarriers included in each OFDM symbol of the two NB-CCEs is the same or varies according to the first preset rule.
  • the NB-PDCCH is the NB-PDCCH in the first format, one or two candidates exist in the DwPTS in the nth downlink subframe or the nth subframe in the communication system.
  • the candidate system has one candidate NB-PDCCH in the DwPTS in the nth downlink subframe or the nth subframe.
  • the base station maps the NB-PDCCH of the first format into the available RE of the first resource unit group or the second resource unit group.
  • the available RE is an RE that does not include a reference signal;
  • the first resource unit group includes all REs of the first NB-CCE, and the second resource unit group includes all REs of the second NB-CCE;
  • the first resource unit group includes all REs of the first NB-CCE and all REs of the second NB-CCE of the first slot in the nth downlink subframe
  • the second resource The unit group includes all REs of the first NB-CCE and all REs of the second NB-CCE of the second slot in the nth downlink subframe.
  • the base station maps the NB-PDCCH of the first format to an available RE of the first resource unit group or before the available RE in the second resource unit group, the base station is configured to use the first to be transmitted.
  • the bit block performs scrambling, modulation, layer mapping, and precoding processing to generate a first vector block, and performs sequence change on the first vector block to generate a first symbol sequence to be transmitted, the first to be transmitted.
  • the bit block is a bit block to be transmitted in the NB-PDCCH of the first format.
  • the eNB sends the NB-PDCCH in the first format to the user terminal in an available RE of the first resource unit group or in an available RE in the second resource unit group: the base station is The first sequence of symbols to be transmitted is mapped in the available REs of the first set of resource elements or in the available REs in the second set of resource elements.
  • the base station maps the NB-PDCCH of the second format into the available RE of the first resource unit group and the second resource unit group.
  • the available RE is an RE that does not include a reference signal.
  • the base station maps the NB-PDCCH in the second format to the available REs in the first resource unit group and the available REs in the second resource unit group, including:
  • the base station sequentially maps the NB-PDCCH of the second format to the available REs of the first NB-CCE and the available REs of the second NB-CCE;
  • the base station sequentially maps the NB-PDCCH of the second format in the available REs of each symbol in the DwPTS in the nth downlink subframe or the nth subframe.
  • the base station maps the NB-PDCCH of the second format to the available REs of the first resource unit group and the available REs of the second resource unit group, the base station to the second to be transmitted
  • the bit block performs scrambling, modulation, layer mapping, and precoding processing to generate a second vector block and sequence changes the second vector block to generate a second symbol sequence to be transmitted, wherein the second
  • the bit block to be transmitted is a bit block to be transmitted in the NB-PDCCH of the second format.
  • the eNB is configured to map the NB-PDCCH in the second format to the available REs in the first resource unit group and the available REs in the second resource unit group, and specifically includes:
  • the base station maps the second symbol sequence to be transmitted in an available RE of the first resource unit group and in an available RE in the second resource unit group.
  • the method for transmitting the physical downlink channel further includes:
  • the base station transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS in the n+a or n-a downlink subframes, the base station is in the n+ath or n-a The blank symbols of the downlink subframes are sent by the NB-PDCCH;
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • all the OFDM in the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the ith OFDM symbol
  • the method for transmitting a physical downlink channel further includes: the base station transmitting the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the base station is in the common downlink
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is transmitted in the subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the base station sends the NB-PDCCH in a preset aggregation window. Further, before the base station sends the NB-PDCCH in a preset aggregation window, the base station sends first configuration information to the user terminal.
  • the first configuration information includes location information of the aggregation window, where location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or The period and time of the default aggregation window Offset.
  • the base station sends the NB-PDCCH in a preset aggregation window, the base station sends second configuration information to the user terminal, where the second configuration information indicates that the user terminal is in the pre- The NB-PDCCH is received or monitored within an aggregated window.
  • a second embodiment of the present invention provides a method for transmitting a physical downlink channel, where a base station transmits a narrowband physical downlink shared channel NB- to a user terminal in a downlink pilot time slot DwPTS in an nth downlink subframe or an nth subframe.
  • the PDSCH transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS in the n+a or na downlink subframes, and the base station is in the n+a or na downlink subframe blank symbols. Sending the NB-PDSCH.
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the base station when the base station sends the NB-PDSCH to the user terminal, all the blank symbols in the subframes including the blank symbols sent to the user terminal are all used, and the NB-PDSCH is sent by using the blank symbols, thereby improving resources. Utilization rate.
  • the OFDM in the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the ith OFDM symbol
  • the symbols are NB-PDSCH mapped on the i-th OFDM symbol arranged in the order of time from small to large, i ⁇ 5.
  • the method for transmitting a physical downlink channel further includes: the base station transmitting the NB-PDSCH in a preset aggregation window.
  • the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the base station transmits the narrowband physical broadcast channel NB in the common downlink subframe.
  • PBCH or narrowband synchronization signal NB-SS, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, b is equal to 3 or 5.
  • the base station sends the NB-PDSCH in a preset aggregation window, the base station sends first configuration information to the user terminal.
  • the first configuration information includes location information of the aggregation window, where location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or The period and time offset of the default aggregate window.
  • the base station sends the NB-PDSCH in a preset aggregation window, the base station sends second configuration information to the user terminal, where the second configuration information indicates that the user terminal is in the pre- The NB-PDSCH is received or monitored within an aggregated window.
  • a third embodiment of the present invention provides a method for receiving a physical downlink channel, where a user terminal receives a narrowband physical downlink control channel sent by a base station in a downlink pilot time slot DwPTS in an nth downlink subframe or an nth subframe.
  • NB-PDCCH a downlink pilot time slot
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource in a frequency domain, and includes an nth downlink sub-subsequence in a time domain. At least one orthogonal frequency division multiplexing OFDM symbol included in a downlink pilot time slot DwPTS in a frame or an nth subframe, the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is The frequency resource included in one resource block RB, n ⁇ 1.
  • the user terminal receives the NB-PDCCH sent by the base station and maps it to On the basic unit of the NB-PDCCH mapping, the basic unit of the NB-PDCCH mapping is a first frequency resource whose bandwidth is less than or equal to 180 kHz or a frequency resource included in one resource block, and the bandwidth of the frequency resource of one resource block is 180 kHz. Therefore, in the embodiment of the present invention, the NB-PDCCH received by the user equipment is mapped on a frequency resource whose frequency resource is less than or equal to 180 kHz, and the PDCCH is transmitted in the NBIOT system, which solves the problem that the PDCCH cannot be supported in the narrowband in the prior art. Issues sent within the bandwidth.
  • the NB-PDCCH mapping basic unit is composed of a first narrowband control channel unit NB-CCE and/or a second NB-CCE, where the first NB-CCE or the second NB-CCE includes m resource units RE , m>1.
  • the NB-PDCCH is an NB-PDCCH in a first format, where the NB-PDCCH of the first format is received in m REs;
  • the NB-PDCCH is an NB-PDCCH in a second format, where the NB-PDCCH of the second format is received in 2*m REs.
  • the m REs are composed of x*y REs, where x represents a continuous orthogonal frequency division multiplexing OFDM symbol in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the number of y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the dwPTS in the nth downlink subframe or the nth subframe, x>1, 12 ⁇ y ⁇ 1.
  • the nth downlink subframe or the nth subframe including the DwPTS is used to send a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a narrowband secondary synchronization signal NB-SSS a frame, where the x OFDM symbols are the first 3 or the first 5 in the nth downlink subframe in the time domain or all the OFDM symbols in the DwPTS in the nth subframe in the order of time from small to large. Continuous OFDM symbols;
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the first OFDM symbol is up to the last OFDM symbol.
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the p+1th OFDM symbol is up to the last OFDM.
  • the number of consecutive OFDM symbols of the symbol, the p is a preset value, or the P is a value carried by the base station through the NB-PBCH or system information, 4 ⁇ p ⁇ 0.
  • each of the m REs includes consecutive 6 subcarriers, and the first NB-CCE or the first The index of the six subcarriers included in each OFDM symbol of the two NB-CCEs is the same or varies according to the first preset rule.
  • the user terminal monitors the first candidate NB-PDCCH and/or in the DwPTS in the nth downlink subframe or the nth subframe.
  • the second candidate NB-PDCCH where the first candidate NB-PDCCH or the second candidate NB-PDCCH includes m REs.
  • the NB-PDCCH of the first format is mapped to an available RE of the first candidate NB-PDCCH or an available RE of the second candidate NB-PDCCH, where the available RE is an RE that does not include a reference signal.
  • the first candidate NB-PDCCH includes all the REs of the first NB-CCE, and the second candidate NB-PDCCH includes all the REs of the second NB-CCE;
  • the first candidate NB-PDCCH includes all REs of the first NB-CCE and all REs of the second NB-CCE of the first slot in the nth downlink subframe
  • the second The candidate NB-PDCCH includes all REs of the first NB-CCE and all REs of the second NB-CCE of the second slot in the nth downlink subframe.
  • the NB-PDCCH of the second format is mapped in the available RE of the first NB-CCE and the available RE of the second NB-CCE.
  • the available RE is an RE that does not contain a reference signal.
  • the method for receiving a physical downlink channel further includes: the user terminal receiving the null of the n+a or n-a downlink subframes of the base station
  • the NB-PDCCH transmitted on the white symbol, the n+a or n-a downlink subframe is a subframe for transmitting a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS.
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the receiving method of the physical downlink channel provided by the embodiment of the present invention further includes: the user terminal receiving or monitoring the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the user terminal is in the common
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is received in the downlink subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the user terminal receives first configuration information sent by the base station, where the first configuration information includes the aggregation window.
  • Position information, the location information of the aggregation window includes at least a time start position of the preset aggregation window and the preset The length of the aggregate window, or the period and time offset of the preset aggregate window.
  • the user terminal receives or monitors the NB-PDCCH in a preset aggregation window, the user terminal receives second configuration information sent by the base station, and the second configuration information indicates the user terminal. Receiving or monitoring the NB-PDCCH within the preset aggregation window.
  • a fourth embodiment of the present invention provides a method for receiving a physical downlink channel, where a user terminal receives a narrowband physical downlink shared channel that is sent by a base station in a downlink pilot time slot DwPTS in an nth downlink subframe or an nth subframe.
  • NB-PDSCH receiving, by the base station, the NB-PDSCH sent on a blank symbol of an n+a or na downlink subframe; the n+a or na downlink subframe is a narrowband physical broadcast channel Subframe of NB-PBCH or narrowband synchronization signal NB-SS.
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the user terminal receives the n+a or na downlink subframes of the NB-PDSCH mapped by the blank symbols sent by the base station, and the n+a or na downlink subframes are used to send the narrowband physical broadcast channel NB-PBCH or narrowband synchronization.
  • the signal NB-SS which utilizes resources of blank symbols in the communication system, improves resource utilization.
  • the receiving method of the physical downlink channel provided by the embodiment of the present invention further includes The user terminal receives or monitors the NB-PDSCH in a preset aggregation window.
  • c represents the number of orthogonal frequency division multiplexing OFDM symbols included in the preset aggregation window in the time domain
  • z For the number of common downlink subframes included in the preset aggregation window, y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the preset aggregation window, and b represents z common downlinks in the time domain.
  • the number of consecutive OFDM symbols in each common downlink subframe in the subframe, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe.
  • the user terminal receives the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB
  • the user terminal receives the first configuration information sent by the base station before receiving or monitoring the NB-PDSCH in a preset aggregation window, where the first configuration information includes location information of the aggregation window,
  • the location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a period and a time offset of the preset aggregation window.
  • the user terminal before receiving or monitoring the NB-PDSCH in a preset aggregation window, the user terminal receives second configuration information sent by the base station, where the second configuration information indicates that the user terminal is in the The NB-PDSCH is received or monitored within an aggregated window.
  • a fifth embodiment of the present invention provides a base station, including a sending unit.
  • the functions implemented by the unit module provided by the embodiment of the present invention are specifically as follows:
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource on the frequency domain, and includes a downlink in the nth downlink subframe or the nth subframe in the time domain.
  • At least one orthogonal frequency division multiplexing OFDM symbol included in the path pilot time slot DwPTS the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is a frequency resource included in one resource block RB, N ⁇ 1.
  • the NB-PDCCH mapping basic unit is composed of a first narrowband control channel unit NB-CCE and/or a second NB-CCE, where the first NB-CCE or the second NB-CCE includes m resource units RE , m>1;
  • the NB-PDCCH is an NB-PDCCH in a first format, where the NB-PDCCH of the first format is sent in m REs;
  • the NB-PDCCH is an NB-PDCCH in a second format, where the NB-PDCCH in the second format is sent in 2*m REs.
  • the m REs are composed of x*y REs, where x represents continuous orthogonal frequency division multiplexing in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • x represents continuous orthogonal frequency division multiplexing in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the number of OFDM symbols, y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the nth downlink subframe or the DwPTS in the nth subframe, x>1, 12 ⁇ y ⁇ 1.
  • the nth downlink subframe or the nth subframe including the DwPTS is used to send a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a narrowband secondary synchronization signal NB-SSS a frame, where the x OFDM symbols are the first 3 or the first 5 in the nth downlink subframe in the time domain or all the OFDM symbols in the DwPTS in the nth subframe in the order of time from small to large. Continuous OFDM symbols;
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the first OFDM symbol is up to the last OFDM symbol.
  • the x represents the nth downlink subframe or all the OFDM symbols in the DwPTS in the nth subframe in the time domain are arranged in order from time to time, the p+1th
  • the OFDM symbol is the number of consecutive OFDM symbols up to the last OFDM symbol, the p is a preset value, or the p is a value carried by the base station through the NB-PBCH or system information, 4 ⁇ p ⁇ 0.
  • each of the m REs includes consecutive 6 subcarriers, and the first NB-CCE or the first The index of the six subcarriers included in each OFDM symbol of the two NB-CCEs is the same or varies according to the first preset rule.
  • the DwPTS in the nth downlink subframe or the nth subframe exists in the communication system to which the base station belongs. Two candidate NB-PDCCHs.
  • NB-PDCCH is the NB-PDCCH in the second format
  • a candidate exists in the DwPTS in the nth downlink subframe or the nth subframe in the communication system to which the base station belongs.
  • NB-PDCCH is the NB-PDCCH in the second format
  • the base station further includes a processing unit.
  • the processing unit is configured to map the NB-PDCCH of the first format to an available RE of the first resource unit group or to the second resource unit, if the NB-PDCCH is the NB-PDCCH of the first format.
  • the available REs in the group are REs that do not contain a reference signal.
  • the first resource unit group includes all REs of the first NB-CCE, and the second resource unit group includes all REs of the second NB-CCE;
  • the first resource unit group includes all REs of the first NB-CCE and all REs of the second NB-CCE of the first slot in the nth downlink subframe
  • the second resource The unit group includes all REs of the first NB-CCE and all REs of the second NB-CCE of the second slot in the nth downlink subframe.
  • the processing unit is further configured to: before mapping the NB-PDCCH of the first format in an available RE of the first resource unit group or in an available RE in the second resource unit group, to the first
  • the bit block to be transmitted is subjected to scrambling, modulation, layer mapping, and precoding processing to generate a first vector block
  • the first bit block to be transmitted is a bit block to be transmitted in the NB-PDCCH of the first format, and a sequence change of the first vector block to generate a first symbol sequence to be transmitted.
  • processing unit is specifically configured to map the first symbol sequence to be transmitted in an available RE of the first resource unit group or in an available RE in the second resource unit group.
  • the processing unit is configured to: if the NB-PDCCH is the NB-PDCCH in the second format, map the NB-PDCCH of the second format to the available REs of the first resource unit group and In the available REs in the two resource unit groups, the available REs are REs that do not include a reference signal.
  • the processing unit is specifically configured to sequentially map the NB-PDCCH of the second format to the available REs of the first NB-CCE and the available REs of the second NB-CCE; or
  • the NB-PDCCH of the second format is sequentially mapped in the available REs of each symbol in the DwPTS in the nth downlink subframe or the nth subframe.
  • the processing unit is further configured to: before mapping the NB-PDCCH of the second format in an available RE of the first resource unit group and an available RE in the second resource unit group, to the second
  • the bit block to be transmitted is subjected to scrambling, modulation, layer mapping and precoding processing to generate a second vector block
  • the second bit block to be transmitted is a bit block to be transmitted in the NB-PDCCH of the second format. And performing a sequence change on the second vector block to generate a second symbol sequence to be transmitted.
  • processing unit is specifically configured to map the second symbol sequence to be transmitted in an available RE of the first resource unit group and an available RE in the second resource unit group.
  • the sending unit is further configured to: if the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is sent in the n+a or na downlink subframes, then in the n+ath or na The blank symbols of the downlink subframes transmit the NB-PDCCH.
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the nth downlink subframe or the nth packet
  • all the OFDM in the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the ith OFDM symbol
  • the sending unit is further configured to send the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the base station is in the common downlink
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is transmitted in the subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the sending unit is further configured to: before sending the NB-PDCCH in a preset aggregation window, send first configuration information to the user terminal, where the first configuration information includes a location of the aggregation window And the location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a period and a time offset of the preset aggregation window.
  • the sending unit is further configured to: before sending the NB-PDCCH in a preset aggregation window, send second configuration information to the user terminal, where the second configuration information indicates that the user terminal is in the Receiving or monitoring the NB-PDCCH within a preset aggregation window.
  • a sixth embodiment of the present invention provides a base station, including a sending unit.
  • the functions implemented by the unit module provided by the embodiment of the present invention are specifically as follows:
  • a sending unit configured to send a narrowband physical downlink shared channel NB-PDSCH to the user terminal in a downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe, and used in the n+a or na
  • the downlink subframe transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS, and the NB-PDSCH is transmitted in a blank symbol of the n+ath or na downlink subframes.
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the OFDM in the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the ith OFDM symbol
  • the symbols are NB-PDSCH mapped on the i-th OFDM symbol arranged in the order of time from small to large, i ⁇ 5.
  • the sending unit is further configured to send the NB-PDSCH in a preset aggregation window.
  • c represents the number of orthogonal frequency division multiplexing OFDM symbols included in the preset aggregation window in the time domain.
  • z is the number of common downlink subframes included in the preset aggregation window
  • y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the preset aggregation window
  • b represents z in the time domain.
  • Each common downlink in the common downlink subframe The number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the base station is in the common downlink
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is transmitted in the subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the sending unit is further configured to send the first configuration information to the user terminal before sending the NB-PDSCH in a preset aggregation window.
  • the first configuration information includes location information of the aggregation window, where location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or The period and time offset of the default aggregate window.
  • the sending unit is further configured to: before sending the NB-PDSCH in a preset aggregation window, send second configuration information to the user terminal, where the second configuration information indicates that the user terminal is in the The NB-PDSCH is received or monitored within a preset aggregation window.
  • a seventh embodiment of the present invention provides a user terminal, including a receiving unit.
  • the functions implemented by the unit module provided by the embodiment of the present invention are specifically as follows:
  • the receiving unit is configured to receive a narrowband physical downlink control channel NB-PDCCH that is sent by the base station in the downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe.
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource in a frequency domain, and includes an nth downlink sub-subsequence in a time domain. At least one orthogonal frequency division multiplexing OFDM symbol included in a downlink pilot time slot DwPTS in a frame or an nth subframe, the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is The frequency resource included in one resource block RB, n ⁇ 1.
  • the NB-PDCCH mapping basic unit is composed of a first narrowband control channel unit NB-CCE and/or a second NB-CCE, where the first NB-CCE or the second NB-CCE includes m resource units RE , m>1.
  • the NB-PDCCH is an NB-PDCCH in a first format, where the NB-PDCCH in the first format is received in m REs;
  • the NB-PDCCH is an NB-PDCCH in a second format, where the NB-PDCCH of the second format is received in 2*m REs.
  • the m REs are composed of x*y REs, where x represents a continuous orthogonal frequency division multiplexing OFDM symbol in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the number of y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the dwPTS in the nth downlink subframe or the nth subframe, x>1, 12 ⁇ y ⁇ 1.
  • the nth downlink subframe or the nth subframe including the DwPTS is used to send a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a narrowband secondary synchronization signal NB-SSS a frame, where the x OFDM symbols are the first 3 or the first 5 in the nth downlink subframe in the time domain or all the OFDM symbols in the DwPTS in the nth subframe in the order of time from small to large. Continuous OFDM symbols;
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the first OFDM symbol is up to the last OFDM symbol.
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the p+1th OFDM symbol is up to the last OFDM.
  • the number of consecutive OFDM symbols of the symbol, the p is a preset value, or the P is a value carried by the base station through the NB-PBCH or system information, 4 ⁇ p ⁇ 0.
  • each of the m REs includes consecutive 6 subcarriers, and the first NB-CCE or the first The index of the six subcarriers included in each OFDM symbol of the two NB-CCEs is the same or varies according to the first preset rule.
  • the user terminal further includes a processing unit.
  • the processing unit is configured to monitor the first candidate NB-PDCCH and/or in the DwPTS in the nth downlink subframe or the nth subframe if the NB-PDCCH is the NB-PDCCH in the first format. Or the second candidate NB-PDCCH, where the first candidate NB-PDCCH or the second candidate NB-PDCCH includes m REs.
  • the NB-PDCCH of the first format is mapped to an available RE of the first candidate NB-PDCCH or an available RE of the second candidate NB-PDCCH, where the available RE is an RE that does not include a reference signal.
  • the first candidate NB-PDCCH includes all the REs of the first NB-CCE, and the second candidate NB-PDCCH includes all the REs of the second NB-CCE;
  • the first candidate NB-PDCCH includes all REs of the first NB-CCE and all REs of the second NB-CCE of the first slot in the nth downlink subframe
  • the second The candidate NB-PDCCH includes all REs of the first NB-CCE and all REs of the second NB-CCE of the second slot in the nth downlink subframe.
  • the user terminal further includes a processing unit.
  • the processing unit is configured to map the NB-PDCCH of the second format to the available RE of the first NB-CCE and the second NB-CCE if the NB-PDCCH is the NB-PDCCH of the second format.
  • the available RE is an RE that does not include a reference signal.
  • the receiving unit is further configured to receive the NB-PDCCH that is sent by the base station on a blank symbol of the n+a or na downlink subframes; the n+a or na downlink sub-subs
  • the frame is a subframe that transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS.
  • the n+ath downlink subframe is the first downlink subframe or the first downlink subframe after the nth subframe including the DwPTS or the first subframe including the DwPTS.
  • a frame the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS
  • the blank symbol refers to the first b consecutive OFDM symbols after all the OFDM symbols in the downlink subframe in which the NB-PBCH or the NB-SS are transmitted are arranged in the order of time from small to large, a>0, b is equal to 3 or 5.
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the receiving unit is further configured to receive or monitor the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the user terminal is in the common
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is received in the downlink subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the receiving unit is further configured to receive first configuration information sent by the base station before receiving or monitoring the NB-PDCCH in a preset aggregation window, where the first configuration information includes the aggregation window Position information, where the location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a period and a time offset of the preset aggregation window the amount.
  • the receiving unit is further configured to: before receiving or monitoring the NB-PDCCH in a preset aggregation window, receive second configuration information sent by the base station, where the second configuration information indicates the user terminal Receiving or monitoring within the preset aggregation window The NB-PDCCH is measured.
  • An eighth embodiment of the present invention provides a user terminal, including a receiving unit.
  • the functions implemented by the unit module provided by the embodiment of the present invention are specifically as follows:
  • a receiving unit configured to receive a narrowband physical downlink shared channel NB-PDSCH sent by the base station in a downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe, and receive the base station in the n+a
  • the NB-PDSCH transmitted on the blank symbols of the na or the downlink subframes, where the n+a or na downlink subframes are subframes for transmitting the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS .
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the receiving unit is further configured to receive or monitor the NB-PDSCH in a preset aggregation window.
  • c represents the number of orthogonal frequency division multiplexing OFDM symbols included in the preset aggregation window in the time domain
  • z For the number of common downlink subframes included in the preset aggregation window, y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the preset aggregation window, b represents the number of consecutive OFDM symbols in each common downlink subframe in the z common downlink subframes in the time domain, and b OFDM symbols are arranged in order of time from small to large for all OFDM symbols in the common downlink subframe After the first b consecutive OFDM symbols, the user terminal receives the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS in the common downlink
  • the receiving unit is further configured to receive the first configuration information sent by the base station before receiving or monitoring the NB-PDSCH in a preset aggregation window.
  • the first configuration information includes location information of the aggregation window, where location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or The period and time offset of the default aggregate window.
  • the receiving unit is further configured to receive second configuration information sent by the base station before receiving or monitoring the NB-PDSCH in a preset aggregation window.
  • the second configuration information indicates that the user terminal receives or monitors the NB-PDSCH in the preset aggregation window.
  • a ninth embodiment of the present invention provides a base station, including an interface circuit, a processor, a memory, and a system bus; the interface circuit, the processor, and the memory are connected to the system bus, when the base station is running, The base station performs a method for transmitting a physical downlink channel as described in the foregoing first embodiment or a method for transmitting a physical downlink channel as described in the foregoing second embodiment.
  • the technical effects of the base station refer to the technical effect of the base station described in the method for transmitting the physical downlink channel performed by the base station in the foregoing first embodiment, or the method for transmitting the physical downlink channel performed by the base station in the foregoing second embodiment.
  • the technical effects of the base station described in the above will not be described here.
  • a tenth embodiment of the present invention provides a user terminal, including an interface circuit, a processor, a memory, and a system bus; the interface circuit, the processor, and the memory are connected to the system bus, when the user terminal is running
  • the user terminal performs the receiving method of the physical downlink channel as described in the foregoing third embodiment or the method of receiving the physical downlink channel as described in the fourth embodiment.
  • the technical effects of the user terminal refer to the technical effect of the user terminal described in the method for receiving the physical downlink channel performed by the user terminal in the foregoing third embodiment, or the physical downlink performed by the user terminal in the fourth embodiment.
  • the technical effects of the user terminal described in the method for receiving a channel are not described herein again.
  • An eleventh embodiment of the present invention provides a communication system, including the base station according to the ninth embodiment, and the user terminal according to the tenth embodiment, wherein the base station and the user terminal are connected through a network. .
  • FIG. 1 is a schematic structural diagram of a first type of frame structure according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a second type of frame structure according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a downlink resource grid according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart 1 of a method for transmitting a physical downlink channel according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of resource mapping of an antenna port in a normal CP in an LTE system
  • FIG. 7 is a schematic diagram of resource mapping of an antenna port when an extended CP is used in an LTE system
  • FIG. 8 is a schematic diagram of resource mapping of an antenna port in a normal CP according to an embodiment of the present disclosure
  • FIG. 9 is a schematic diagram of resource mapping of an antenna port when an extended CP is provided according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram 1 of an NB-CCE including an RE when a normal CP is provided in an embodiment of the present invention
  • FIG. 11 is a second schematic structural diagram of an NB-CCE including an RE when a normal CP is provided according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram 1 of an NB-CCE including an RE when an extended CP is provided according to an embodiment of the present invention
  • FIG. 13 is a schematic structural diagram 2 of an NB-CCE including an RE when an extended CP is provided according to an embodiment of the present invention
  • FIG. 14 is a schematic structural diagram 3 of an NB-CCE including an RE when a normal CP is provided according to an embodiment of the present invention
  • FIG. 15 is a schematic structural diagram 4 of an NB-CCE including an RE when a normal CP is provided according to an embodiment of the present invention
  • FIG. 16 is a schematic structural diagram 3 of an NB-CCE including an RE when an extended CP is provided according to an embodiment of the present invention
  • FIG. 17 is a schematic structural diagram 4 of an NB-CCE including an RE when an extended CP is provided according to an embodiment of the present invention
  • FIG. 18 is a schematic structural diagram 1 of a blank symbol mapping resource according to an embodiment of the present disclosure.
  • FIG. 19 is a schematic structural diagram 2 of a blank symbol mapping resource according to an embodiment of the present disclosure.
  • FIG. 20 is a second schematic flowchart of a method for transmitting a physical downlink channel according to an embodiment of the present disclosure
  • FIG. 21 is a schematic structural diagram 1 of a base station according to an embodiment of the present disclosure.
  • FIG. 22 is a schematic structural diagram 2 of a base station according to an embodiment of the present disclosure.
  • FIG. 23 is a schematic structural diagram 3 of a base station according to an embodiment of the present disclosure.
  • FIG. 24 is a schematic structural diagram 1 of a user terminal according to an embodiment of the present disclosure.
  • FIG. 25 is a schematic structural diagram 2 of a user terminal according to an embodiment of the present disclosure.
  • FIG. 26 is a schematic structural diagram 3 of a user terminal according to an embodiment of the present disclosure.
  • FIG. 27 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the physical resources of the PDCCH transmission are in units of CCE (Control Channel Element), and one CCE includes 9 REGs (Resource Element Groups), and each REG is composed of the same OFDM ( Orthogonal Frequency Division Multiplexing (OFDM) consists of four consecutive REs (Resource Elements).
  • OFDM Orthogonal Frequency Division Multiplexing
  • the REG is sequentially numbered in the direction of increasing frequency in the frequency resources of the entire LTE system bandwidth.
  • the REG is a continuous four REs other than the CRS in the same OFDM symbol.
  • the CRS configured in the cell is the CRS of the single antenna port
  • the CRS of the two antenna ports needs to be excluded, for example, the antenna port 0 and the antenna port are configured in the cell.
  • the CRS of 1 excludes the CRS of antenna port 0 and antenna port 1 when calculating the number of REs included in the REG.
  • the CRS configured in the cell is the CRS of two antenna ports or four antenna ports, When the number of REs included in the REG is counted, the number of CRSs excluded is determined according to the number of CRSs in which the antenna ports are configured according to the actual situation.
  • N CCE The number of CCEs available in the system, N CCE, can be understood as: all REGs except the REGs occupied by the PCFICH (Physical Control Format Indicator Channel) and the PHICH (Physical HARQ Indicator Channel). The number is divided by 9, where the number of REGs occupied by the PCFICH is 4, and the PHICH does not necessarily occupy the REG.
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical HARQ Indicator Channel
  • the number of CCEs available in the system can be expressed by the following formula:
  • the number of all REGs except the REG occupied by the PCFICH and the PHICH in the N REG system Take the whole symbol for the bottom.
  • the CCE numbers are consecutive, starting from 0 to N CCE -1.
  • the number of CCEs occupied by the PDCCH depends on the downlink channel environment in which the terminal is located. For a terminal with a good downlink channel environment, the base station may only need to allocate one CCE; for a terminal with a poor downlink channel environment, the base station may need to allocate up to 8 CCEs.
  • the LTE system In order to simplify the complexity of the terminal when decoding the PDCCH, the LTE system also specifies a PDCCH occupying N CCEs, and the index of the CCE at the starting position must be an integer multiple of N.
  • one PDCCH may occupy 1, 2, 4 or 8 CCEs.
  • the format of the PDCCH is as shown in Table 1.
  • the physical resources transmitted by the PDCCH are transmitted within the entire bandwidth of the LTE system.
  • the standard bandwidth of the LTE system is 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. Therefore, the minimum bandwidth occupied by the physical resources of the PDCCH transmission is the minimum system standard bandwidth, that is, 1.4 MHz.
  • the bandwidth of the NBIOT system is 180 kHz. Therefore, the PDCCH in the existing LTE system cannot support the transmission of physical resources in such a narrow band of bandwidth.
  • the embodiment of the present invention provides a method, a device, and a system for transmitting a physical downlink channel, and a DwPTS (Downlink Pilot Time Slot) of a base station in an nth downlink subframe or an nth subframe
  • the time slot is configured to send a NB-PDCCH (Narrowband Physical Downlink Control Channel) to the user terminal, where the bandwidth of the NB-PDCCH mapping frequency resource is less than or equal to 180 kHz on the NB-PDCCH mapping basic unit. This enables transmission of the PDCCH in the NBIOT system.
  • the PBCH Physical Broadcast Channel
  • the PSS Primary Synchronization Signal
  • the SSS Secondary Synchronization Signal
  • the PDCCH and the PDSCH are respectively named in the NBIOT system as a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, a narrowband secondary synchronization signal NB-SSS, a narrowband physical downlink control channel NB-PDCCH, and a narrowband physical downlink shared channel NB. -PDSCH.
  • the names of the above-mentioned channels and the names of the signals are only an example, and are mainly used to distinguish the LTE system from the NBIOT system.
  • the names of the respective channels and signals in the NBIOT system are not specifically limited.
  • the types of frame structures include a first type of frame structure suitable for a FDD (Frequency Division Duplex) system and a second type suitable for a TDD (Time Division Duplex) system.
  • Type frame structure In the LTE system and the NBIOT system, the types of frame structures include a first type of frame structure suitable for a FDD (Frequency Division Duplex) system and a second type suitable for a TDD (Time Division Duplex) system.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • a radio frame in the first type of frame structure, has a time length of 10 milliseconds, and one radio frame is composed of 20 time slots, each time slot is 0.5 milliseconds, and two consecutive times
  • the slot is one subframe, that is, the first type of frame structure includes 10 subframes, and each subframe has a length of 1 millisecond.
  • a radio frame has a time length of 10 milliseconds, and one radio frame is composed of two half frames having a length of 5 milliseconds, and each half frame is composed of five 1 millisecond sub-frames. Frame composition.
  • the second type of frame structure includes a downlink subframe, a special subframe, and an uplink subframe.
  • the special subframe includes a DwPTS, an UpPTS (Uplink Pilot Time Slot), and a Guard Period (GP).
  • DwPTS Downlink Pilot Time Slot
  • GP Guard Period
  • the DwPTS in the special subframe is always used to send the downlink
  • the UpPTS is always used to send the uplink
  • the GP is the protection time of the downlink to the uplink.
  • the total length of the three is 1 millisecond.
  • the uplink and downlink configuration of the second type of frame structure is as shown in Table 2, where D represents a downlink subframe, S represents a special subframe, and U represents an uplink subframe.
  • the special subframe exists in both half frames.
  • the switching point of the downlink uplink is 10 milliseconds, the special subframe is only in the first one. There is a half frame.
  • the lengths of the DwPTS, GP, and UpPTS in the special subframe of the second type frame structure are as shown in Table 3 below.
  • the number of OFDM symbols included in each subframe differs according to the length of the CP (Cyclic Prefix) in the first type frame structure and the second type frame structure.
  • each time slot contains 7 OFDM symbols; when the CP is an extended CP, each time slot contains 6 OFDM symbols.
  • the signals transmitted in each time slot can be described by one or more RGs (Resource Grids).
  • each resource grid consists of Subcarriers and OFDM symbol, The value depends on the transmission bandwidth of the downstream configuration and is satisfied. Minimum downstream bandwidth in the system Equal to 6, the maximum downstream bandwidth Equal to 110.
  • Each unit in the RG is called an RE (Resource Element), and each RE is identified by an index pair (k, l) in one slot.
  • k and l are indices on the frequency domain and the time domain, respectively.
  • RB Resources Block
  • One RB contains in time Contiguous OFDM symbols, included in the frequency domain Continuous subcarriers, of which with The values are shown in Table 4. Therefore, an RB consists of RE composition.
  • One RB corresponds to one time slot in the time domain and corresponds to 180 kHz in the frequency domain.
  • the number of the RB is from 0 to 0 in the frequency domain.
  • the relationship between the sequence number n PRB of the RB and the resource unit (k, l) in the frequency domain in one slot can be expressed as:
  • the frequency resource network dedicated to the NBIOT system supports two new types of terminals.
  • the frequency resources used may be those that are recovered and reused from the GSM (Global System for Mobile Communication) system, or It is a band resource used in 3G (3rd-Generation, 3rd Generation Mobile Communication Technology) system or LTE system.
  • the frequency resources used by the NBIOT system are located in the protection band of the frequency band used by the LTE system.
  • the frequency resource used by the NBIOT system is located in a standard carrier of the LTE system, such as 10MHz or 20MHz bandwidth, that is, a standard carrier of the LTE system supports both the common LTE terminal and the new two terminals.
  • a standard carrier of the LTE system supports both the common LTE terminal and the new two terminals.
  • the maximum transmission power that the NBIOT system can use to transmit the physical downlink channel may be smaller.
  • FIG. 4 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the communication system includes a base station 101 and one or more user terminals 102, and the user terminal 102 communicates with the base station 101 via a communication channel 103.
  • the user terminal 102 in the embodiment of the present invention refers to a user terminal with a relatively small bandwidth supported by the radio.
  • the user terminal 102 in the embodiment of the present invention uplink supports the SC-FDMA transmission of a single subcarrier with an orthogonal subcarrier interval of 3.75 kHz or the FDMA transmission of a single subchannel with a subchannel bandwidth of 3.75 kHz, or a user terminal.
  • 102 uplink supports single subcarrier SC-FDMA transmission with orthogonal subcarrier spacing of 15 kHz, or user terminal 102 uplink supports transmission of multiple subcarrier SC-FDMA with orthogonal subcarrier spacing of 15 kHz.
  • the base station 101 has a scheduling function of a shared channel, and has a history based on the history of packet data sent to the user terminal 102.
  • the scheduling is that when a plurality of user terminals 102 share transmission resources, a mechanism is needed to effectively allocate the physical layer. Resources to obtain statistical multiplexing gain.
  • the user terminal 102 transmits and receives data through the communication channel 103 established with the base station 101.
  • the user terminal 102 performs transmission or reception processing of the shared channel based on the information transmitted through the scheduling control channel.
  • the user terminal 102 may be a mobile station, a mobile phone, a computer, a portable terminal, or the like, and the types of the user terminals 102 may be the same or different.
  • the base station 101 and the user terminal 102 receive and transmit data through the communication channel 103, and the communication channel 103 can be a wireless communication channel, and the wireless communication signal
  • the communication channel 103 has at least a shared channel and a scheduling control channel, and the shared channel is shared among the plurality of user terminals 102 for transmitting and receiving packets, and the scheduling control channel is used for transmitting the allocation of the shared channel, and corresponding scheduling results, and the like.
  • FIG. 5 is a schematic flowchart of a method for transmitting a physical downlink channel according to an embodiment of the present invention.
  • the transmission method includes a sending method and a receiving method, and the transmitting method is applied to the communications system shown in FIG. 4.
  • the DwPTS of the base station in the nth downlink subframe or the nth subframe sends an NB-PDCCH to the user equipment, where n ⁇ 1.
  • the user equipment receives an NB-PDCCH that is sent by the base station in the DwPTS in the nth downlink subframe or the nth subframe.
  • the NB-PDCCH in the embodiment of the present invention carries scheduling allocation information and other control information of the NB-PDSCH.
  • the scheduling allocation information is used to schedule an NB-PDSCH carrying downlink data or a narrowband uplink shared channel NB-PUSCH carrying uplink data.
  • step S101 the base station transmits an NB-PDCCH to the user terminal.
  • the base station when the base station sends the NB-PDCCH to the user terminal, the base station maps the NB-PDCCH to the NB-PDCCH mapping basic unit.
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource in the frequency domain, and includes a downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the at least one OFDM symbol included, the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is a frequency resource included in one RB.
  • the NB-PDCCH mapping basic unit is composed of the first NB-CCE and/or the second NB-CCE, and the NB-PDCCH in the embodiment of the present invention is transmitted on one or two NB-CCEs.
  • the format of the NB-PDCCH in the embodiment of the present invention is as shown in Table 5.
  • the NB-PDCCH in the format of 0 is referred to as the NB-PDCCH in the first format
  • the NB-PDCCH in the format 1 is referred to as the NB-PDCCH in the second format.
  • the NB-PDCCH mentioned in the embodiment of the present invention is transmitted on one NB-CCE, that is, the number of REs occupied by the NB-PDCCH is the same as the number of available REs included in one NB-CCE.
  • the NB-PDCCH mentioned in the embodiment of the present invention is transmitted on two NB-CCEs, which means that the number of REs occupied by the NB-PDCCH is the same as the number of available REs included in the two NB-CCEs.
  • the available RE refers to the RE remaining in the RE included in the NB-CCE except for the RE occupied by the reference signal.
  • the reference signal includes a CRS and/or a CSI-RS (Channel State Information-Reference Signal).
  • the CRS includes a CRS used by the LTE system and a narrowband reference signal NB-RS used by the NBIOT system
  • the CSI-RS includes a CSI-RS used by the LTE system, or a narrowband NB-CSI used by the NBIOT system. RS.
  • the CRS may only contain the narrowband reference signal NB-RS used by the NBIOT system
  • the CSI-RS may only contain the narrowband NB-CSI-RS used by the NBIOT system.
  • the downlink reference signals in the LTE system include CRS and CSI-RS.
  • the CRS is transmitted in all downlink subframes in which the cell supports the PDSCH, and is transmitted on one or more antenna ports.
  • n s is the slot number in one radio frame (Radio Frame)
  • l is the number of the OFDM symbol in one slot
  • c(i) is a pseudo-random sequence and is defined as a length of 31.
  • the Glod sequence is the maximum downlink bandwidth configuration.
  • an output sequence c(n) of length M PN is defined as:
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • Reference signal sequence Modulation symbols to be mapped to complex values The reference symbol of the modulation slot n s antenna port p, the mapping relationship is among them,
  • Mod is the remainder operator.
  • the above mapping mode is represented in the form of a graph.
  • the CP type of the downlink subframe is a normal CP
  • a schematic diagram of a CRS mapped to an RE sent by one antenna port, two antenna ports, and four antenna ports is shown in FIG. 6.
  • the CP type of the downlink subframe is an extended CP
  • a schematic diagram of the structure of the CRS transmitted by one antenna port, two antenna ports, and four antenna ports mapped to the RE is shown in FIG. 7.
  • the NB-RS in the embodiment of the present invention transmits in all the downlink subframes in which the cell supports the NB-PDSCH or the DwPTS in the DwPTS subframe, and the NB-RS is mapped and transmitted in only one RB.
  • the NB-RS transmits on one antenna port or on two antenna ports.
  • NB-RS sequence is defined as:
  • c(i) is a pseudo-random sequence and is defined as a Glod sequence of length 31.
  • an output sequence c(n) of length M PN is defined as:
  • x 1 (n+31) (x 1 (n+3)+x 1 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the initial value is At the beginning of each OFDM, the second m-sequence is initialized with this initial value to generate an NB-RS, where Identify the physical layer cell and
  • the first NB-CCE and the second NB-CCE each include m REs.
  • m REs are composed of x*y REs
  • x represents the number of consecutive orthogonal frequency division multiplexing OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain
  • y represents the DwPTS in the nth downlink subframe or the nth subframe
  • nth downlink subframe or the nth subframe that includes the DwPTS For transmitting a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a subframe of a narrowband secondary synchronization signal NB-SSS then x OFDM symbols are the nth downlink subframe in the time domain or All the OFDM symbols in the DwPTS in the nth subframe are arranged in the order of time from small to large, and the first 3 or the first 5 consecutive OFDM symbols are arranged.
  • the nth downlink subframe or the nth subframe including the DwPTS is a subframe for transmitting a narrowband physical broadcast channel NB-PBCH or a narrowband primary synchronization signal NB-PSS
  • the x OFDM symbols are time The first 3 consecutive OFDM symbols arranged in the nth downlink subframe or the DwPTS in the nth subframe in the order of time from small to large.
  • the x OFDM symbols are the nth downlink subframe in the time domain or All OFDM symbols in the DwPTS in the nth subframe are arranged in the order of time from small to large, and the first 3 or 5 consecutive OFDM symbols are arranged.
  • x represents the nth downlink subframe or all OFDM symbols in the DwPTS in the nth subframe in the time domain are arranged in order of time from small to large, and the p+1th OFDM symbol Up to the number of consecutive OFDM symbols of the last OFDM symbol, the p is a preset value, or the p is a value carried by the base station through the NB-PBCH or system information, 4 ⁇ p ⁇ 0.
  • the base station transmits the control channel of the LTE system on the first p consecutive OFDM symbols, including a PDCCH, a PCFICH (Physical Control Format Indicator Channel), and a PHICH (Physical Hybrid ARQ Indicator Channel). At least one of the indication channels).
  • a PDCCH Physical Downlink Control Channel
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • the value of p is a preset value, and p is equal to 3 or 4.
  • the preset is specified in the standard text.
  • x in the embodiment of the present invention represents all the OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain in order of time from small to large. After arranging, the number of consecutive OFDM symbols up to the last OFDM symbol from the 1st OFDM symbol.
  • the x OFDM symbols are 14 OFDM symbols included in the nth downlink subframe.
  • the value of x is determined by the configuration of the special subframe in Table 3. For example, when the special subframe configuration is 0 or 5, the value of x is 3; when the special subframe is configured with 1 or 6, the value of x is 9; when the special subframe is configured with 2 or 7, the value of x is 10; When the subframe configuration is 3 or 8, the value of x is 11, and when the special subframe is configured with 4, the value of x is 12.
  • the x OFDM symbols are 12 OFDM symbols included in the nth downlink subframe.
  • the value of x is determined by the configuration of the special subframe in Table 3 in the DwPTS of the nth subframe. For example, when the special subframe configuration is 0 or 4, the value of x is 3; when the special subframe is configured with 1 or 5, the value of x is 8; when the special subframe is configured with 2 or 6, the value of x is 9; the special subframe When configuring 3, the value of x is 10.
  • the first NB-CCE or the second NB-CCE includes consecutive 6 subcarriers on each of the m REs, and the first NB-CCE is in each of the m REs.
  • the symbol includes six consecutive subcarriers and the second NB-CCE includes no consecutive overlap of six consecutive subcarriers on each of the m REs, and the first NB-CCE or the second NB-CCE is in each
  • the indexes of the six subcarriers included in the OFDM symbol are the same or vary according to the first preset rule.
  • the REs included in the first NB-CCE and the second NB-CCE may be represented as (k, l). .
  • FIG. 10 shows the LTE system configuration.
  • the NBIOT system configures the resource mapping structure of the NB-RS of two antenna ports.
  • FIG. 11 shows that the LTE system configures four antenna ports.
  • the CRS and NBIOT systems configure a resource mapping structure for NB-RSs of two antenna ports.
  • FIG. 12 shows the LTE system configuration.
  • FIG. 13 shows that the LTE system configures four antenna ports.
  • the CRS and NBIOT systems configure a resource mapping structure for NB-RSs of two antenna ports.
  • the first preset rule in the embodiment of the present invention is that the index of the six subcarriers included in each OFDM symbol of the first NB-CCE or the second NB-CCE changes every one OFDM symbol, or the first NB-
  • the index of the 6 subcarriers included in the CCE or the second NB-CCE in each OFDM symbol is determined according to a preset formula.
  • the first preset rule is that the index of the six subcarriers included in each OFDM symbol of the first NB-CCE or the second NB-CCE changes every one OFDM symbol, and is configured as a normal CP in the downlink of the system.
  • the second NB-CCE contains RE (k, l),
  • 10, 11 and l 0, 2, 4, 6.
  • the first NB-CCE or the second NB-CCE is included in each OFDM symbol.
  • FIG. 14 shows that the CRS and the NBIOT system configuration of the LTE system are configured with a single antenna port or two antenna ports.
  • the resource mapping structure of the NB-RS of the antenna port is configured with a single antenna port or two antenna ports.
  • FIG. 15 shows LTE.
  • the system configures the CRS of the four antenna ports and the resource mapping structure of the NBIOT system when configuring the NB-RS of the two antenna ports.
  • the system is configured as an extended CP in the downlink.
  • FIG. 16 A resource mapping structure in which an LTE system configures a single antenna port or a CRS of two antenna ports, and an NBIOT system configures an NB-RS of two antenna ports is shown.
  • FIG. 17 shows LTE.
  • the system configures the CRS of the four antenna ports and the resource mapping structure of the NBIOT system when configuring the NB-RS of the two antenna ports.
  • the number of the OFDM symbol in the slot, the RNTI of the user terminal is C-RNTI (Cell Radio Network Temporary Identifier), SPS (Semi-Persistent Scheduling) C-RNTI or temporary C-RNTI .
  • the base station maps the NB-PDCCH of the first format into the available RE of the first resource unit group or the available RE of the second resource unit group, and the available RE is not including the reference signal. RE.
  • the first resource unit group includes all REs of the first NB-CCE, and the second resource unit group includes all REs of the second NB-CCE;
  • the first resource unit group includes all REs of the first NB-CCE of the first slot in the nth downlink subframe and all REs of the second NB-CCE, and the second resource unit group includes the nth downlink subframe. All REs of the first NB-CCE of the second time slot and all REs of the second NB-CCE.
  • the base station will be the NB in the first format.
  • the PDCCH is mapped in the available REs of the first NB-CCE or in the available REs in the NB-CCE.
  • the base station determines in which NB-CCE available REs for each NB-PDCCH to be transmitted.
  • the base station may determine, according to a certain rule, which NB-CCE available REs to transmit to the user terminal the NB-PDCCH to be transmitted.
  • the index of the NB-PDCCH mapping sent by the base station to the user terminal in the first or second NB-CCE is determined by (Y k +m) mod2.
  • the NB-PDCCH transmitted by the base station to the user terminal is mapped in the available RE of the first NB-CCE; for example, the result of (Y k +m) mod2 is 1
  • the base station scrambles the first to-be-transmitted bit block before the base station maps the NB-PDCCH of the first format to the available RE of the first resource unit group or the available RE of the second resource unit group. And modulating, layer mapping, and precoding processing to generate a first vector block and performing a sequence change on the first vector block to generate a first symbol sequence to be transmitted, wherein the first bit block to be transmitted is A block of bits to be transmitted in the NB-PDCCH of the first format.
  • the base station maps the first symbol sequence to be transmitted in the available RE of the first resource unit group or the available RE in the second resource unit group.
  • the eNB may send two NB-PDCCHs of the first format in one subframe, and the two NB-PDCCHs of the first format may be sent to the same user terminal, or may be sent to different users. Terminal's.
  • the base station When the base station transmits two NB-PDCCHs of the first format in one subframe, the first to-be-transmitted bit blocks respectively carried by the NB-PDCCHs of the two first formats are multiplexed together, and then complex The bit block is subjected to scrambling, modulation, layer mapping and precoding processing to generate a first vector block, and performing a sequence change on the first vector block to generate a first symbol sequence to be transmitted, such that the base station The first sequence of symbols to be transmitted is mapped in the available REs of the first set of resource elements and the available REs in the second set of resource elements.
  • a bit block to be transmitted in the NB-PDCCH of the first format in the nth subframe where The number of bits transmitted on the i-th NB-PDCCH in the nth subframe.
  • the bit blocks to be transmitted by each NB-PDCCH are multiplexed together to generate a bit block
  • the n PDCCH is the number of NB-PDCCHs in the nth subframe, and in the NBIOT system, the n PDCCH is equal to 1 or 2.
  • the multiplexed bit block is scrambled by the NBIOT system narrowband reference signal NB-RS before modulation, and forms a scrambled bit block.
  • the NB-RS used in the scrambling process in the embodiment of the present invention is the same as the NB-RS in the NBIOT system described above, and will not be described in detail herein.
  • c(i) is a scrambling sequence and the scrambling sequence generator is initialized at the beginning of each subframe and the initial value is
  • the vector block After the vector block is mapped to the resource unit, the vector block undergoes a sequence change (Permutation) to generate a sequence of symbols to be transmitted.
  • the sequence of symbols to be transmitted is represented by a symbol pair or a symbolic quad.
  • the sequence transform is formed based on sub-block interleaving.
  • w (p) (0), ..., w (p) (M quad -1) may be mapped in the order of the second NB-CCE mapping after the first NB-CCE mapping.
  • the mapping is performed in the order of the pre-frequency domain and the time domain, and is not mapped on the reference signal.
  • the reference signal refers to the narrowband reference signal NB-RS of the NBIOT system; in the in-band deployment scenario, the reference signal also includes the CRS and/or CSI-RS of the LTE system.
  • the RE corresponding to the CSI-RS does not transmit the symbol of the bearer NB-PDCCH but sends the CSI-RS.
  • the reference signal refers to the narrowband reference signal NB-RS of the NBIOT system; in the in-band deployment scenario, the reference signal also includes the CRS and/or CSI-RS of the LTE system.
  • the RE corresponding to the CSI-RS does not transmit the symbol of the bearer NB-PDCCH but sends the CSI-RS. .
  • the base station maps the NB-PDCCH of the second format into the available REs of the first resource unit group and the available REs of the second resource unit group, and the available REs are not including the reference signal. RE.
  • the NB-PDCCH in the second format may be sequentially mapped in the available RE of the first NB-CCE and the available RE of the second NB-CCE, or the NB-PDCCH in the second format may be sequentially Mapping in the available REs of each symbol within the Nw downlink subframe or the DwPTS within the nth subframe.
  • the base station further performs scrambling on the second to-be-transmitted bit block before the base station maps the second format NB-PDCCH in the available RE of the first resource unit group and before the available RE in the second resource unit group. And modulating, layer mapping, and precoding processing to generate a second vector block and performing a sequence change on the second vector block to generate a second symbol sequence to be transmitted, wherein the second bit block to be transmitted is in the second format The bit block to be transmitted in the NB-PDCCH.
  • the order on CCE1 is mapped on the available REs in the first NB-CCE and the second NB-CCE.
  • the first available RE on the symbol starts mapping until all available REs on the first symbol have been mapped, and then the mapping starts from the second OFDM symbol.
  • the base station maps w (p) (0), ..., w (p) (M quad -1) in the order of first mapping on the first NB-CCE to the second NB-CCE or in the first frequency domain. The time domain is mapped sequentially and is not mapped on the reference signal.
  • the reference signal refers to the narrowband reference signal NB-RS of the NBIOT system; in the in-band deployment scenario, the reference signal also includes the CRS and/or CSI-RS of the LTE system.
  • the RE corresponding to the CSI-RS when there is a CSI-RS of the LTE system in the bandwidth of the NBIOT system, the RE corresponding to the CSI-RS does not transmit the symbol of the bearer NB-PDCCH but sends the CSI-RS. .
  • the user terminal performs step S102, that is, the user terminal receives the NB-PDCCH transmitted by the base station in the DwPTS in the nth downlink subframe or the nth subframe.
  • the NB-PDCCH is the NB-PDCCH in the first format, one or two candidate NB-PDCCHs exist in the DwPTS in the nth downlink subframe or the nth subframe in the communication system. If the NB-PDCCH is the NB-PDCCH in the second format, a candidate NB-PDCCH exists in the DwPTS in the nth downlink subframe or the nth subframe in the communication system.
  • the user terminal monitors the first candidate NB-PDCCH and/or the second candidate NB in the DwPTS in the nth downlink subframe or the nth subframe.
  • PDCCH Physical Downlink Control Channel
  • the first candidate NB-PDCCH or the second candidate NB-PDCCH includes m REs.
  • the NB-PDCCH of the first format is mapped on the available RE of the first candidate NB-PDCCH or the available RE of the second candidate NB-PDCCH, and the available RE is an RE that does not include the reference signal.
  • the first candidate NB-PDCCH includes all the REs of the first NB-CCE, and the second candidate NB-PDCCH includes all the REs of the second NB-CCE;
  • the first candidate NB-PDCCH includes the first one of the first time slots in the nth downlink subframe All REs of the NB-CCE and all REs of the second NB-CCE
  • the second candidate NB-PDCCH includes all REs of the first NB-CCE and the second NB-CCE of the second slot in the nth downlink subframe All REs.
  • the NB-PDCCH of the second format is mapped to the available RE of the first NB-CCE and the available RE of the second NB-CCE, and the available RE is not included in the reference.
  • the RE of the signal is the NB-PDCCH of the second format.
  • the method for transmitting a physical downlink channel further includes: if the base station transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS in the n+a or na downlink subframes, the base station is The blank symbol of the n+ath or na downlink subframes transmits the NB-PDCCH.
  • the n+a downlink subframe is the nth downlink subframe or the first downlink subframe after the nth subframe including the DwPTS or the first subframe including the DwPTS, and the nath downlink subframe
  • the blank symbol refers to the downlink subframe in which the NB-PBCH or the NB-SS is transmitted.
  • all the OFDM symbols in the subframe in which the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the i-th OFDM symbol are arranged in order from time to time.
  • the second type of frame structure includes a downlink subframe, a special subframe, and an uplink subframe
  • a scenario in which the downlink subframe and the uplink subframe are adjacent to each other in the second type of frame structure is provided by the embodiment of the present invention.
  • the method is for a downlink subframe, and therefore, in the second type of frame structure, the n+ath downlink subframe or the nath downlink subframe may be a subframe that is not adjacent to the nth downlink subframe. .
  • the consecutive subframes involved in the embodiment of the present invention are any two adjacent downlink subframes.
  • the reference within each subframe The signal is only NB-RS, and the first 3 OFDM symbols are not transmitted in the NB-PBCH subframe.
  • the NB-PSS In the subframe where the NB-PSS is transmitted, when the system is configured as a normal CP, the NB-PSS is used when transmitting.
  • the last 11 OFDM symbols in the subframe that is, the first 3 OFDM symbols are not transmitted NB-PSS; in the subframe in which the NB-SSS is transmitted, when the system is configured as a normal CP, the NB-SSS is used in the subframe when transmitting
  • the last 11 or 9 OFDM symbols, ie the first 3 or the first 5 OFDM symbols, do not transmit NB-SSS.
  • the base station transmits the NB-PDCCH on the blank OFDM symbol of subframe n+a.
  • the base station When the blank symbol is 3 OFDM symbols, the base station repeatedly transmits the NB-PDCCH transmitted on the first 3 OFDM symbols of the subframe n in the first 3 OFDM symbols of the subframe n+a. When the blank symbol is 5 OFDM symbols, the base station repeatedly transmits the NB-PDCCH transmitted on the first 5 OFDM symbols of the subframe n in the first 5 OFDM symbols of the subframe n+a.
  • the first transmission NB-PDCCH following the subframe n+a is transmitted on the blank OFDM symbol of the subframe n+a.
  • the subframe n is the first subframe used for transmitting the NB-PDCCH, and the NB-PDCCH should be transmitted in one subframe, but if the first downlink after the subframe n
  • the subframe n+a is a NB-PBCH, NB-PSS or NB-SSS subframe, and the NB-PDCCH is transmitted on the blank OFDM symbol of the subframe n+a.
  • the NB-PDCCH is mapped to the available REs on the subframe n and the subframe n+a, and the available RE includes the RE that does not transmit the reference signal in the subframe n and the RE that does not transmit the reference signal on the blank OFDM symbol in the subframe n+a.
  • the NB-PDCCH is mapped on the available REs on the subframe n, and the NB-PDCCH repeated mappings transmitted on the first 3 or the first 5 OFDM symbols in the subframe n after mapping are three in the subframe n+a Or on the RE of the first 5 OFDM symbols that does not transmit the reference signal.
  • subframe n is a transmission NB-PBCH, NB-PSS Or an NB-SSS subframe
  • first downlink subframe n+a following the subframe n is the first subframe in which the NB-PDCCH can be transmitted and the NB-PDCCH should be transmitted in one subframe
  • the NB-PDCCH is transmitted on the blank OFDM symbol of the NB-PBCH, NB-PSS or NB-SSS subframe.
  • the NB-PDCCH is mapped to the available REs on the subframe n and the subframe n+a, and the available resources include the RE that does not transmit the reference signal on the blank OFDM symbol of the subframe n and the RE that does not transmit the reference signal in the subframe n+a.
  • the NB-PDCCH is mapped on the available REs on the subframe n+a, and the NB-PDCCH repeated mappings transmitted on the first 3 or the first 5 OFDM symbols in the subframe n+a are mapped in the subframe n. On the RE of the first 5 OFDM symbols that do not transmit the reference signal.
  • the base station is in the nth downlink.
  • the first 3 or the first 5 consecutive OFDM symbols of the subframe transmit the NB-PDCCH.
  • the method of transmitting the NB-PDCCH for the first 3 or the first 5 consecutive OFDM symbols is the same as the method for transmitting the NB-PDCCH by the previous blank symbol, and is not explained here.
  • the base station may send configuration information to the user terminal, where the configuration information includes indication information for instructing the user terminal to monitor the NB-PDCCH transmitted on the blank symbol.
  • the channel or signaling carrying the configuration information includes NB-PBCH, SI (System Information), RRC (Radio Resource Control) signaling, or MAC (Media Access Control) signaling. At least one.
  • the user terminal receives the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS sent by the base station in the n+a or na downlink subframes, the user terminal receives the base station at the n+ath or nath The NB-PDCCH transmitted on the blank symbol of the downlink subframe.
  • the n+ath downlink subframe is the nth downlink subframe or the first downlink subframe after the nth subframe including the DwPTS or the first subframe including the DwPTS, and the n-th downlink
  • the row subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, and the blank symbol refers to the NB-PBCH or NB-SS.
  • All the OFDM symbols in the downlink subframe are arranged in the order of time from small to large, the first b consecutive OFDM symbols, a>0, b is equal to 3 or 5, and the NB-SS includes the narrowband primary synchronization signal NB-PSS or narrowband secondary synchronization.
  • Signal NB-SSS is the narrowband primary synchronization signal NB-PSS or narrowband secondary synchronization.
  • the ith OFDM symbol is repeatedly transmitted on the i-th OFDM symbol, and all the OFDM symbols in the n-th subframe are arranged on the i-th OFDM symbol in the order of time from small to large.
  • the user terminal can receive the NB- received on the ith OFDM symbol in the NB-PDSCH received on the ith OFDM symbol and the ith OFDM symbols arranged in the order of time from small to large in all the OFDM symbols in the nth subframe.
  • the PDSCH performs joint detection, thereby improving the detection performance of the NB-PDSCH.
  • the joint detection may include corresponding symbol level combining or bit level combining.
  • the physical downlink channel transmission method provided by the embodiment of the present invention makes full use of blank symbols, which can improve resource utilization.
  • the method for transmitting a physical downlink channel further includes: the base station transmitting the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the base station is in the common downlink subframe
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is transmitted, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the preset aggregation window is formed by the blank symbols of the z common downlink subframes, and the mapping of the blank symbols belonging to the same subframe in the preset aggregation window and the blank symbols described above are mapped. the same.
  • the aggregation window may also include an nth downlink subframe or an nth subframe including the DwPTS.
  • the base station sends the first configuration information to the user terminal, where the first configuration information includes the location information of the aggregation window, and the location information of the aggregation window includes at least the preset aggregation.
  • the channel or signaling that carries the first configuration information includes NB-PBCH, SI (System Information), RRC (Radio Resource Control) signaling, or MAC (Media Access Control). At least one of signaling.
  • the base station before the base station sends the NB-PDCCH in the preset aggregation window, the base station further sends second configuration information to the user terminal, where the second configuration information indicates that the user terminal receives or monitors the NB-PDCCH in a preset aggregation window.
  • the channel or signaling carrying the second configuration information includes NB-PBCH, SI (System Information), RRC (Radio Resource Control) signaling, or MAC (Media Access Control). At least one of signaling.
  • SI System Information
  • RRC Radio Resource Control
  • MAC Media Access Control
  • the user terminal also receives or monitors the NB-PDCCH within a preset aggregation window.
  • the number of consecutive OFDM symbols, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the user terminal is in the common downlink subframe
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is received internally, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the user terminal before the user terminal receives or monitors the NB-PDCCH in the preset aggregation window, the user terminal further receives the first configuration information sent by the base station.
  • the first configuration information includes location information of the aggregation window, and the location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a preset period and time offset of the aggregation window. .
  • the user terminal before the user terminal receives or monitors the NB-PDCCH in the preset aggregation window, the user terminal further receives the second configuration information sent by the base station.
  • the second configuration information indicates that the user terminal receives or monitors the NB-PDCCH within a preset aggregation window.
  • An embodiment of the present invention provides a method for transmitting a physical downlink channel, where a base station transmits an NB-PDCCH to a terminal in a DwPTS in an nth downlink subframe or an nth subframe, where a bandwidth of the NB-PDCCH mapping frequency resource is less than or equal to On the basic unit of the 180 kHz NB-PDCCH mapping, the PDCCH is transmitted in the NBIOT system.
  • FIG. 20 is a schematic flowchart diagram of a method for transmitting a physical downlink channel according to an embodiment of the present invention.
  • the transmission method includes a sending method and a receiving method, and the transmission method is applied to the communication system shown in FIG. 4.
  • the DwPTS of the base station in the nth downlink subframe or the nth subframe sends a narrowband physical downlink shared channel NB-PDSCH to the user terminal, and sends the NB-PBCH or NB-SS in the n+a or na downlink subframes. Then, the base station transmits the NB-PDSCH in the blank symbol of the n+ath or na downlink subframes.
  • the user equipment receives the NB-PDSCH sent by the base station in the DwPTS in the nth downlink subframe or the nth subframe, and the NB-PDSCH sent by the base station on the n+a or na downlink subframe blank symbols.
  • the n+a or na downlink subframe is a subframe in which the NB-PBCH or the NB-SS is transmitted.
  • the n+ath downlink subframe in the embodiment of the present invention is the first downlink subframe or the first downlink subframe after the nth subframe including the DwPTS or the first one that includes the DwPTS.
  • a subframe the nath downlink subframe is the first downlink subframe or the first packet before the nth subframe including the DwPTS a subframe including a DwPTS, where the blank symbol refers to a first b consecutive OFDM symbols in which all OFDM symbols in a downlink subframe in which the NB-PBCH or the NB-SS are transmitted are arranged in a small to large time.
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the n-th downlink subframe or the n-th subframe including the DwPTS is repeatedly transmitted on the i-th OFDM symbol.
  • the user terminal can receive the NB- received on the ith OFDM symbol in the NB-PDSCH received on the ith OFDM symbol and the ith OFDM symbols arranged in the order of time from small to large in all the OFDM symbols in the nth subframe.
  • the PDSCH performs joint detection, thereby improving the detection performance of the NB-PDSCH.
  • the joint detection may include corresponding symbol level combining or bit level combining.
  • the second type of frame structure includes a downlink subframe, a special subframe, and an uplink subframe
  • a scenario in which the downlink subframe and the uplink subframe are adjacent to each other in the second type of frame structure is provided by the embodiment of the present invention.
  • the method is for a downlink subframe, and therefore, in the second type of frame structure, the n+ath downlink subframe or the nath downlink subframe may be a subframe that is not adjacent to the nth downlink subframe. .
  • the consecutive subframes involved in the embodiment of the present invention are any two adjacent downlink subframes.
  • the reference signal in each subframe is only NB-RS, and the first 3 OFDM symbols in the subframe in which the NB-PBCH is transmitted are not sent NB-PBCH; in the NB-PSS In the subframe, when the system is configured as a normal CP, the NB-PSS transmits the last 11 OFDM symbols in the subframe, that is, the first 3 OFDM symbols do not transmit the NB-PSS; in the subframe in which the NB-SSS is transmitted, When the system is configured as a normal CP, the NB-SSS transmits the last 11 or 9 OFDM symbols in the subframe, that is, the first 3 or the first 5 OFDM symbols do not send the NB-SSS.
  • the base station transmits NB-PDSCH on the blank OFDM symbol of subframe n+a.
  • the base station When the blank symbol is 3 OFDM symbols, the base station repeatedly transmits the NB-PDSCH transmitted on the first 3 OFDM symbols of the subframe n in the first 3 OFDM symbols of the subframe n+a. When the blank symbol is 5 OFDM symbols, the base station repeatedly transmits the NB-PDSCH transmitted on the first 5 OFDM symbols of the subframe n in the first 5 OFDM symbols of the subframe n+a.
  • the base station transmits the NB-PDSCH on the blank OFDM symbol of the subframe n+a.
  • the first transmission NB-PDSCH following the subframe n+a is transmitted on the blank OFDM symbol of the subframe n+a.
  • the subframe n is the first subframe used for transmitting the NB-PDSCH, and the NB-PDSCH should be transmitted in one subframe, but if the first downlink after the subframe n
  • the subframe n+a is a transmission NB-PBCH, NB-PSS or NB-SSS subframe, and then the NB-PDSCH is transmitted on the blank OFDM symbol of the subframe n+a.
  • the NB-PDSCH is mapped to the available REs on the subframe n and the subframe n+a, and the available RE includes the RE that does not transmit the reference signal in the subframe n and the RE that does not transmit the reference signal on the blank OFDM symbol in the subframe n+a.
  • NB-PDSCH is mapped on the available REs on the subframe n, and the NB-PDSCH repetition mapping transmitted on the first 3 or the first 5 OFDM symbols in the subframe n after mapping is three in the subframe n+a Or on the RE of the first 5 OFDM symbols that does not transmit the reference signal.
  • the subframe n is a NB-PBCH, NB-PSS or NB-SSS subframe
  • the first downlink subframe n+a following the subframe n is the first one
  • the subframe of the NB-PDSCH is transmitted and the NB-PDSCH should be transmitted in one subframe, and then the NB-PDSCH is transmitted on the blank OFDM symbol of the NB-PBCH, NB-PSS or NB-SSS subframe.
  • the NB-PDSCH is mapped to the available REs on the subframe n and the subframe n+a, and the available resources include the RE that does not transmit the reference signal on the subframe n blank OFDM symbol and the RE that does not transmit the reference signal in the subframe n+a; Or the NB-PDSCH is mapped on the available REs on the subframe n+a, and the NB-PDSCH repeated mappings transmitted on the first 3 or the first 5 OFDM symbols in the subframe n+a are mapped in the subframe n. On the RE of the first 5 OFDM symbols that do not transmit the reference signal.
  • the method for transmitting a physical downlink channel further includes: the base station transmitting the NB-PDSCH in a preset aggregation window.
  • the quantity, z is the number of common downlink subframes included in the preset aggregation window, y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the preset aggregation window, and b represents the time domain z
  • the number of consecutive OFDM symbols in each common downlink subframe in the common downlink subframe, and the b OFDM symbols are the first b consecutives in which all OFDM symbols in the common downlink subframe are arranged in order from time to time.
  • OFDM symbol the base station transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS in the common downlink subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, b is equal to 3 or 5.
  • the aggregation window includes not only a common downlink subframe, but also an nth downlink subframe or an nth subframe including the DwPTS.
  • the base station sends first configuration information to the user terminal, where the first configuration information includes a time position of the aggregation window.
  • the time position information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a period and a time offset of the preset aggregation window .
  • the channel or signaling carrying the first configuration information includes NB-PBCH, SI (System Information), RRC (Radio Resource Control) signaling, and MAC (Media Access Control). At least one of signaling.
  • the base station sends the NB-PDSCH in a preset aggregation window, the base station sends second configuration information to the user terminal, where the second configuration information indicates that the user terminal is in the The NB-PDSCH is received or monitored within a preset aggregation window.
  • the channel or signaling carrying the second configuration information includes NB-PBCH, SI (System Information), RRC (Radio Resource Control) signaling, or MAC (Media Access Control). At least one of signaling.
  • SI System Information
  • RRC Radio Resource Control
  • MAC Media Access Control
  • the physical downlink channel transmission method provided by the embodiment of the present invention can fully utilize blank symbols and improve resource utilization.
  • the embodiment of the invention provides a base station 1 for performing the steps performed by the base station in the above method.
  • the base station 1 may include a module corresponding to the corresponding step.
  • the base station 1 includes:
  • the transmitting unit 10 is configured to send a narrowband physical downlink control channel NB-PDCCH to the user terminal in the downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe.
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource in a frequency domain, and includes an nth downlink sub-subsequence in a time domain. At least one orthogonal frequency division multiplexing OFDM symbol included in a downlink pilot time slot DwPTS in a frame or an nth subframe, the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is The frequency resource included in one resource block RB, n ⁇ 1.
  • the NB-PDCCH mapping basic unit is composed of a first narrowband control channel unit NB-CCE and/or a second NB-CCE, where the first NB-CCE or the second NB-CCE includes m resource units RE , m>1.
  • the NB-PDCCH is an NB-PDCCH in a first format, where the NB-PDCCH in the first format is sent in m REs;
  • the NB-PDCCH is an NB-PDCCH in a second format, where the NB-PDCCH in the second format is sent in 2*m REs.
  • the m REs are composed of x*y REs, where x represents continuous orthogonal frequency division multiplexing in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • x represents continuous orthogonal frequency division multiplexing in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the number of OFDM symbols, y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the nth downlink subframe or the DwPTS in the nth subframe, x>1, 12 ⁇ y ⁇ 1.
  • the nth downlink subframe or the nth subframe including the DwPTS is used to send a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a narrowband secondary synchronization signal NB-SSS a frame, where the x OFDM symbols are the first 3 or the first 5 in the nth downlink subframe in the time domain or all the OFDM symbols in the DwPTS in the nth subframe in the order of time from small to large. Continuous OFDM symbols;
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the first OFDM symbol is up to the last OFDM symbol.
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the p+1th OFDM symbol is up to the last OFDM.
  • the number of consecutive OFDM symbols of the symbol, the p is a preset value, or the p is a value carried by the base station through the NB-PBCH or system information, 4 ⁇ p ⁇ 0.
  • each of the m REs includes consecutive 6 subcarriers, and the first NB-CCE or the first The index of the six subcarriers included in each OFDM symbol of the two NB-CCEs is the same or varies according to the first preset rule.
  • the communication system to which the base station belongs is in the nth downlink subframe or the nth subframe.
  • NB-PDCCH is the NB-PDCCH in the second format
  • a candidate exists in the DwPTS in the nth downlink subframe or the nth subframe in the communication system to which the base station belongs.
  • NB-PDCCH is the NB-PDCCH in the second format
  • the base station 1 further includes a processing unit 11.
  • the processing unit 11 is configured to map the NB-PDCCH of the first format to an available RE of the first resource unit group or to the second resource if the NB-PDCCH is the NB-PDCCH of the first format.
  • the available RE is an RE that does not include a reference signal.
  • the first resource unit group includes all REs of the first NB-CCE, and the second resource unit group includes all REs of the second NB-CCE;
  • the first resource unit group includes all REs of the first NB-CCE and all REs of the second NB-CCE of the first slot in the nth downlink subframe
  • the second resource The unit group includes all REs of the first NB-CCE and all REs of the second NB-CCE of the second slot in the nth downlink subframe.
  • the processing unit 11 is further configured to: before mapping the NB-PDCCH of the first format in an available RE of the first resource unit group or in an available RE in the second resource unit group, A bit block to be transmitted is subjected to scrambling, modulation, layer mapping, and precoding processing to generate a first vector block, where the first bit block to be transmitted is a bit to be transmitted in the NB-PDCCH of the first format Blocking, and performing a sequence change on the first vector block to generate a first sequence of symbols to be transmitted.
  • processing unit 11 is specifically configured to map the first symbol sequence to be transmitted in an available RE of the first resource unit group or in an available RE in the second resource unit group.
  • the processing unit 11 is configured to: if the NB-PDCCH is the NB-PDCCH of the second format, map the NB-PDCCH of the second format to the available REs of the first resource unit group, and In the available REs in the second resource unit group, the available REs are REs that do not include a reference signal.
  • the processing unit 11 is specifically configured to sequentially map the NB-PDCCH of the second format to the available REs of the first NB-CCE and the available REs of the second NB-CCE; or The NB-PDCCH of the second format is sequentially mapped in available REs of each symbol in the DwPTS in the nth downlink subframe or the nth subframe.
  • the processing unit 11 is further configured to: before mapping the NB-PDCCH of the second format into an available RE of the first resource unit group and an available RE of the second resource unit group,
  • the second block to be transmitted is subjected to scrambling, modulation, layer mapping, and precoding processing to generate a second vector block, where the second bit block to be transmitted is a bit to be transmitted in the NB-PDCCH of the second format. a block, and for performing a sequence change on the second vector block to generate a second sequence of symbols to be transmitted.
  • processing unit 11 is specifically configured to map the second symbol sequence to be transmitted in an available RE of the first resource unit group and an available RE in the second resource unit group.
  • the sending unit 10 is further configured to: if the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is sent in the n+a or na downlink subframes, then in the n+ath or The blank symbols of the na downlink subframes transmit the NB-PDCCH.
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe including the DwPTS, where the blank symbol refers to Transmitting, by the NB-PBCH or all OFDM symbols in the downlink subframe of the NB-SS, the first b consecutive OFDM symbols arranged in order from time to time, a>0, b is equal to 3 or 5,
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • all the OFDM in the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the ith OFDM symbol
  • the sending unit 10 is further configured to send the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the base station is in the common downlink
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is transmitted in the subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the sending unit 10 is further configured to send the first configuration information to the user terminal before sending the NB-PDCCH in a preset aggregation window.
  • the first configuration information includes location information of the aggregation window, where location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or The period and time offset of the default aggregate window.
  • the sending unit 10 is further configured to: before sending the NB-PDCCH in a preset aggregation window, send second configuration information to the user terminal, where the second configuration information indicates that the user terminal is Receiving or monitoring the NB-PDCCH in the preset aggregation window.
  • the sending unit 10 is configured to send a narrowband physical downlink shared channel NB-PDSCH to the user terminal in the downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe, and Sending the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS to the n+a or na downlink subframes, and transmitting the NB-PDSCH in the blank symbols of the n+a or na downlink subframes .
  • the n+ath downlink subframe is the first downlink subframe or the nth downlink subframe after the subframe containing the DwPTS or the first subframe including the DwPTS
  • the nath downlink subframe is the nth downlink subframe or the nth packet
  • the OFDM in the nth downlink subframe or the nth subframe including the DwPTS are repeatedly transmitted on the ith OFDM symbol
  • the symbols are NB-PDSCH mapped on the i-th OFDM symbol arranged in the order of time from small to large, i ⁇ 5.
  • the sending unit 10 is further configured to send the NB-PDSCH in a preset aggregation window.
  • z is the number of common downlink subframes included in the preset aggregation window
  • y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the preset aggregation window
  • b represents z in the time domain.
  • the number of consecutive OFDM symbols in each common downlink subframe in the common downlink subframe, and the b OFDM symbols are the first b consecutive OFDMs in which all OFDM symbols in the common downlink subframe are arranged in order from time to time.
  • a symbol, the base station transmitting a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS in the common downlink subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, b is equal to 3
  • the sending unit 10 is further configured to: before sending the NB-PDSCH in a preset aggregation window, send first configuration information to the user terminal, where the first configuration information includes the aggregation window.
  • Position information where the location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a period and a time offset of the preset aggregation window .
  • the sending unit 10 is further configured to send the second configuration information to the user terminal before sending the NB-PDSCH in a preset aggregation window.
  • the second configuration information indicates that the user terminal is in the preset aggregation window.
  • the NB-PDSCH is received or monitored.
  • the base station 1 in this embodiment only performs logical division according to the functions implemented by the base station 1. In actual applications, the superposition or splitting of the foregoing units may be performed.
  • the function of the base station 1 provided by the embodiment is the same as the method for transmitting the physical downlink channel provided by the first embodiment, and the method for transmitting the physical downlink channel provided by the second embodiment, and the implementation of the base station 1 is more detailed. The processing flow has been described in detail in the first embodiment and the second embodiment of the foregoing method, and will not be described in detail herein.
  • the base station includes an interface circuit 20, a processor 21, a memory 22, and a system bus 23.
  • the interface circuit 20, the processor 21 and the memory 22 are connected by the system bus 23, and complete communication with each other.
  • the structure of the base station shown in FIG. 23 is not limited to a base station, and may include more or less components than those illustrated, or some components may be combined, or different component arrangements.
  • the base station when the base station is running, the base station performs a physical downlink channel transmission method described in Embodiment 1 or Embodiment 2.
  • the base station performs a physical downlink channel transmission method described in Embodiment 1 or Embodiment 2.
  • the specific physical downlink channel transmission method refer to the related description in the foregoing embodiment shown in FIG. 5 or FIG. 20, and details are not described herein again.
  • the interface circuit 20 is configured to implement a communication connection between the base station and the user terminal.
  • the memory 22 can be used to store software programs and application modules, and the processor 21 executes various functional applications and data processing of the base station by running software programs stored in the memory 22 and application modules.
  • the memory 22 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function (such as a transmission subframe), and the like.
  • the memory 22 may include a volatile memory, such as a high-speed random access memory (RAM), and the memory 22 may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, Or His volatile solid-state storage devices.
  • a volatile memory such as a high-speed random access memory (RAM)
  • the memory 22 may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, Or His volatile solid-state storage devices.
  • the processor 21 is a control center of the base station, and connects various parts of the entire base station by using various interfaces and lines, by running or executing software programs and/or application modules stored in the memory 22, and calling the storage in the memory.
  • the data in 22 performs various functions of the base station and processes data, thereby performing overall monitoring of the base station.
  • the processor 21 can be a central processing unit (CPU).
  • the processor 21 can also be other general purpose processors, digital signal processing (DSP) or other programmable logic devices or transistor logic devices, discrete hardware components, and the like.
  • DSP digital signal processing
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the system bus 23 can include a data bus, a power bus, a control bus, a signal status bus, and the like. For the sake of clarity in the present embodiment, various buses are illustrated as the system bus 23 in FIG.
  • An embodiment of the present invention provides a base station, where a base station sends an NB-PDCCH to a terminal in a DwPTS in an nth downlink subframe or an nth subframe, where the bandwidth of the NB-PDCCH mapping frequency resource is less than or equal to 180 kHz NB-PDCCH.
  • the PDCCH is transmitted in the NBIOT system.
  • the embodiment of the present invention provides a user terminal 1 for performing the steps performed by the user terminal in the above method.
  • the user terminal 1 may include a module corresponding to the corresponding step.
  • the user terminal 1 includes:
  • the receiving unit 30 is configured to receive a narrowband physical downlink control channel NB-PDCCH that is sent by the base station in the downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe.
  • the NB-PDCCH mapping basic unit includes a first frequency resource or a second frequency resource in a frequency domain, and includes an nth downlink sub-subsequence in a time domain. At least one orthogonal frequency division multiplexing OFDM symbol included in a downlink pilot time slot DwPTS in a frame or an nth subframe, the bandwidth of the first frequency resource is less than or equal to 180 kHz, and the second frequency resource is 1 resource The frequency resource contained in block RB, n ⁇ 1.
  • the NB-PDCCH mapping basic unit is composed of a first narrowband control channel unit NB-CCE and/or a second NB-CCE, where the first NB-CCE or the second NB-CCE includes m resource units RE , m>1.
  • the NB-PDCCH is an NB-PDCCH in a first format, where the NB-PDCCH in the first format is received in m REs;
  • the NB-PDCCH is an NB-PDCCH in a second format, where the NB-PDCCH of the second format is received in 2*m REs.
  • the m REs are composed of x*y REs, where x represents a continuous orthogonal frequency division multiplexing OFDM symbol in the dwPTS in the nth downlink subframe or the nth subframe in the time domain.
  • the number of y represents the number of subcarriers corresponding to each OFDM symbol in the frequency domain in the dwPTS in the nth downlink subframe or the nth subframe, x>1, 12 ⁇ y ⁇ 1.
  • the nth downlink subframe or the nth subframe including the DwPTS is used to send a narrowband physical broadcast channel NB-PBCH, a narrowband primary synchronization signal NB-PSS, or a narrowband secondary synchronization signal NB-SSS a frame, where the x OFDM symbols are the first 3 or the first 5 in the nth downlink subframe in the time domain or all the OFDM symbols in the DwPTS in the nth subframe in the order of time from small to large. Continuous OFDM symbols;
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the first OFDM symbol is up to the last OFDM symbol.
  • the x represents that all OFDM symbols in the dwPTS in the nth downlink subframe or the nth subframe in the time domain are arranged in order from time to time, and the p+1th OFDM symbol is up to the last OFDM.
  • the number of consecutive OFDM symbols of the symbol, the p is a preset value, or the P is the base station passing the NB-PBCH or The value carried by the system information, 4 ⁇ p ⁇ 0.
  • each of the m REs includes consecutive 6 subcarriers, and the first NB-CCE or the first The index of the six subcarriers included in each OFDM symbol of the two NB-CCEs is the same or varies according to the first preset rule.
  • the user terminal 1 further includes a processing unit 31.
  • the processing unit 31 is configured to monitor the first candidate NB-PDCCH and the DwPTS in the nth downlink subframe or the nth subframe if the NB-PDCCH is the NB-PDCCH in the first format. / or a second candidate NB-PDCCH, the first candidate NB-PDCCH or the second candidate NB-PDCCH includes m REs.
  • the NB-PDCCH of the first format is mapped to an available RE of the first candidate NB-PDCCH or an available RE of the second candidate NB-PDCCH, where the available RE is an RE that does not include a reference signal.
  • the first candidate NB-PDCCH includes all the REs of the first NB-CCE, and the second candidate NB-PDCCH includes all the REs of the second NB-CCE;
  • the first candidate NB-PDCCH includes all REs of the first NB-CCE and all REs of the second NB-CCE of the first slot in the nth downlink subframe
  • the second The candidate NB-PDCCH includes all REs of the first NB-CCE and all REs of the second NB-CCE of the second slot in the nth downlink subframe.
  • the processing unit 31 is configured to map the NB-PDCCH of the second format to the available RE of the first NB-CCE and the second NB-CCE if the NB-PDCCH is the NB-PDCCH of the second format.
  • the available RE is an RE that does not include a reference signal.
  • the receiving unit 30 is further configured to receive, by the base station, the NB-PDCCH that is sent on a blank symbol of the n+a or na downlink subframes; the n+a or na downlink
  • the subframe is a subframe that transmits a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS.
  • the n+a downlink subframe is the nth downlink subframe or the nth a first downlink subframe after the subframe including the DwPTS or a first subframe including the DwPTS, where the nath downlink subframe is the nth downlink subframe or the nth subframe including the DwPTS a first downlink subframe before the frame or a first subframe including a DwPTS, where the blank symbol refers to all OFDM symbols in the downlink subframe in which the NB-PBCH or the NB-SS is transmitted, according to time from small to small
  • the large order of the first b consecutive OFDM symbols, a>0, b is equal to 3 or 5
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the receiving unit 30 is further configured to receive or monitor the NB-PDCCH in a preset aggregation window.
  • the number of consecutive OFDM symbols in the frame, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the user terminal is in the common
  • the narrowband physical broadcast channel NB-PBCH or the narrowband synchronization signal NB-SS is received in the downlink subframe, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, and b is equal to 3 or 5.
  • the receiving unit 30 is further configured to receive the first configuration information sent by the base station before receiving or monitoring the NB-PDCCH in a preset aggregation window.
  • the first configuration information includes location information of the aggregation window, where location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or The period and time offset of the default aggregate window.
  • the receiving unit 30 is further configured to receive in a preset aggregation window. Before receiving the NB-PDCCH, receiving second configuration information sent by the base station.
  • the second configuration information indicates that the user terminal receives or monitors the NB-PDCCH in the preset aggregation window.
  • the receiving unit 30 is configured to receive, by the base station, a narrowband physical downlink shared channel NB-PDSCH transmitted in a downlink pilot time slot DwPTS in the nth downlink subframe or the nth subframe, and receive the base station in The NB-PDSCH transmitted on the blank symbol of the n+ath or na downlink subframes.
  • NB-PDSCH narrowband physical downlink shared channel
  • the n+a or na downlink subframes are subframes for transmitting a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS; the n+a or na downlink subframes are transmitting narrowband physical broadcast channels.
  • the n+ath downlink subframe is the first downlink after the nth downlink subframe or the nth subframe including the DwPTS a subframe or a first subframe that includes a DwPTS, where the nath downlink subframe is the first downlink subframe or the first downlink subframe before the nth subframe including the DwPTS or the first subframe a subframe including a DwPTS, where the blank symbol refers to the first b consecutive OFDMs in which all OFDM symbols in the downlink subframe of the NB-PBCH or the NB-SS are arranged in order from time to time.
  • the symbol, a>0,b is equal to 3 or 5
  • the NB-SS includes a narrowband primary synchronization signal NB-PSS or a narrowband secondary synchronization signal NB-SSS.
  • the receiving unit 30 is further configured to receive or monitor the NB-PDSCH in a preset aggregation window.
  • the number of OFDM symbols, and the b OFDM symbols are the first b consecutive OFDM symbols arranged in the order of time from small to large for all OFDM symbols in the common downlink subframe, and the user terminal is in the common downlink subframe
  • Receiving a narrowband physical broadcast channel NB-PBCH or a narrowband synchronization signal NB-SS, c ⁇ 3, z ⁇ 1, 12 ⁇ y ⁇ 1, b is equal to 3 or 5.
  • the receiving unit 30 is further configured to receive first configuration information sent by the base station before receiving or monitoring the NB-PDSCH in a preset aggregation window, where the first configuration information includes the aggregation Location information of the window, where the location information of the aggregation window includes at least a time start position of the preset aggregation window and a length of the preset aggregation window, or a period and time offset of the preset aggregation window Transfer amount.
  • the receiving unit 30 is further configured to receive second configuration information sent by the base station before receiving or monitoring the NB-PDSCH in a preset aggregation window, where the second configuration information indicates the user
  • the terminal receives or monitors the NB-PDSCH within the preset aggregation window.
  • the user terminal includes an interface circuit 40, a processor 41, a memory 42, and a system bus 43.
  • the interface circuit 40, the processor 41 and the memory 42 are connected by the system bus 43 and complete communication with each other.
  • FIG. 26 is not a limitation to the user terminal, and may include more or less components than those illustrated, or a combination of certain components, or different component arrangements.
  • the user terminal when the user terminal is running, the user terminal performs a physical downlink channel transmission method described in Embodiment 1 or Embodiment 2.
  • a physical downlink channel transmission method described in Embodiment 1 or Embodiment 2.
  • the specific physical downlink channel transmission method refer to the related description in the foregoing embodiment shown in FIG. 5 or FIG. 20, and details are not described herein again.
  • the interface circuit 40 is configured to implement a communication connection between the user terminal and the base station.
  • the memory 42 can be used to store a software program and an application module, and the processor 41 runs the software program stored in the memory 42 and the application module, thereby Perform various functional applications and data processing of the user terminal.
  • the memory 42 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function (such as a transmission travel path request function), and the like; and the storage data area may store a map.
  • the memory 42 may include a volatile memory, such as a high-speed random access memory (RAM), and the memory 42 may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, Or other volatile solid-state storage devices.
  • a volatile memory such as a high-speed random access memory (RAM)
  • the memory 42 may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, Or other volatile solid-state storage devices.
  • the processor 41 is a control center of the user terminal, and connects various parts of the entire user terminal by using various interfaces and lines, by running or executing a software program and/or an application module stored in the memory 42, and calling the storage.
  • the data in the memory 42 performs various functions and processing data of the user terminal, thereby performing overall monitoring of the user terminal.
  • the processor 41 can be a central processing unit (CPU).
  • the processor 41 can also be other general purpose processors, digital signal processing (DSP) or other programmable logic devices or transistor logic devices, discrete hardware components, and the like.
  • DSP digital signal processing
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the system bus 43 can include a data bus, a power bus, a control bus, and a signal status bus. For the sake of clarity in the present embodiment, various buses are illustrated as the system bus 43 in FIG.
  • the embodiment of the present invention provides a user terminal, where the DwPTS of the user terminal in the nth downlink subframe or the nth subframe receives the NB-PDCCH transmitted by the base station, where the bandwidth of the NB-PDCCH mapping frequency resource is less than or equal to 180 kHz.
  • the PDCCH is transmitted in the NBIOT system.
  • the embodiment of the present invention provides a communication system, as shown in FIG. 27, the communication system includes the base station according to the foregoing third embodiment, and the user terminal according to the fourth embodiment, the base station and the user Terminals are connected through a network.
  • the disclosed system, mobile device and method may be implemented in other manners.
  • the mobile device embodiments described above are merely illustrative.
  • the division of the modules or units is only one logical function division.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, mobile device or unit, and may be in electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. , including a number of instructions to make a computer device (which can be a personal computer, server, or network
  • the processor or the like performs all or part of the steps of the method of the various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明的实施例提供一种物理下行信道的传输方法、装置及系统，涉及通信领域，解决了LTE系统中的PDCCH无法支持在窄带带宽内发送的问题。该传输方法包括：基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行控制信道NB-PDCCH；NB-PDCCH映射在NB-PDCCH映射基本单元上，NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，第一频率资源的带宽小于或等于180kHz，第二频率资源为1个资源块RB包含的频率资源，n≥1。

Description

一种物理下行信道的传输方法、装置及系统 技术领域
本发明涉及通信领域，尤其涉及一种物理下行信道的传输方法、装置及系统。
背景技术
目前，在LTE(Long Term Evolution，长期演进计划)系统中，每个下行子帧内发送的物理下行信道包括PDCCH(Physical Downlink Control Channel，物理下行控制信道)和PDSCH(Physical Downlink Shared Channel，物理下行共享信道)。PDCCH承载PDSCH的调度分配(Scheduling Assignments)信息和其他控制信息(Control Information)。
LTE系统的标准带宽为1.4MHz，3MHz，5MHz，10MHz，15MHz和20MHz，即兆赫兹。LTE系统中，PDCCH在频率域维度上映射时占用的最小的带宽为最小的系统标准带宽，即1.4MHz。
而随着通信技术的快速发展，出现了一类新的终端，该类终端射频支持的带宽比较小。例如，第一类终端，上行支持正交子载波间隔为3.75kHz(即千赫兹)的单个子载波的SC-FDMA(Single-Carrier Frequency-Division Multiple Access，单载波的频分多址)发送或子信道带宽为3.75kHz的单个子信道的FDMA(Frequency-Division Multiple Access，频分多址)发送，和/或上行支持正交子载波间隔为15kHz的单个子载波SC-FDMA发送；第二类终端，上行支持正交子载波间隔为15kHz的多个子载波SC-FDMA的发送。
这两类终端主要应用于物理网通信，通信的特点是上下行通信信道或信号使用的带宽通常比较窄，比LTE系统支持的最小系统标准带宽还要小，因此，也将这两类终端以及支持这两类终端通信的基站统称为NBIOT(Narrowband-Internet of Thing，窄带物联网) 系统。值得注意的是，这两类终端是对NBIOT系统支持的终端的一种划分方法，NBIOT支持的终端也可能体现为一种终端支持一种、两种或三种不同的终端能力，即第一种能力为上行支持正交子载波间隔为3.75kHz SC-FDMA发送或子信道带宽为3.75kHz的单个子信道的FDMA发送；第二种能力为上行支持正交子载波间隔为15kHz的单个子载波SC-FDMA发送；第三种能力为上行支持正交子载波间隔为15kHz的多个子载波SC-FDMA的发送。在NBIOT系统中，系统的带宽为180kHz。
现有技术中，LTE系统中的PDCCH无法支持在这么窄带的带宽内发送，因此，亟需需要一种新的物理下行信道的资源映射方法。
发明内容
本发明的实施例提供一种物理下行信道的传输方法、装置及系统，解决了LTE系统中的PDCCH无法支持在窄带带宽内发送的问题。
为达到上述目的，本发明的实施例采用如下技术方案：
本发明第一实施例提供一种物理下行信道的发送方法，基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行控制信道NB-PDCCH。其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
本发明实施例中基站在向用户终端发送NB-PDCCH时，将NB-PDCCH映射在NB-PDCCH映射基本单元上，NB-PDCCH映射基本单元在频率上为带宽小于或等于180kHz的第一频率资源或者为一个资源块包含的频率资源，一个资源块的频率资源的带宽为180kHz，因此，本发明实施例中基站将NB-PDCCH映射在频率资源小于或等于180kHz的频率资源上，并向用户终端发送该NB-PDCCH。这样即可实 现在NBIOT系统中传输PDCCH，解决了现有技术中PDCCH无法支持在窄带带宽内发送的问题。
具体的，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1；
所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中发送；
或者，
所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中发送。
具体的，所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或所述第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
进一步地，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所 述p为预设的数值，或者所述p为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
具体的，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
具体的，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个或两个候选NB-PDCCH；
若所述NB-PDCCH为第二格式的NB-PDCCH，则所述通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个候选NB-PDCCH。
进一步地，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述基站将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE；
其中，所述第一资源单元组包含所述第一NB-CCE的所有RE，所述第二资源单元组包含所述第二NB-CCE的所有RE；
或者，
所述第一资源单元组包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二资源单元组包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
进一步地，所述基站将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中之前，所述基站对第一待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，并对所述第一向量块进行序列变化，以生成待传输的第一符号序列，所述第一待传输的比特块为所述第一格式的NB-PDCCH中待传输的比特块。
具体的，所述基站在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中向所述用户终端发送所述第一格式的NB-PDCCH为：所述基站将所述待传输的第一符号序列映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中。
具体的，若所述NB-PDCCH为第二格式的NB-PDCCH，则所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
具体的，所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，包括：
所述基站将所述第二格式的NB-PDCCH依次映射在所述第一NB-CCE的可用RE中和第二NB-CCE的可用RE中；
或者，
所述基站将所述第二格式的NB-PDCCH依次在所述第n个下行子帧或第n个子帧内的DwPTS内的每个符号的可用RE中映射。
进一步地，所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中之前，所述基站对第二待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第二向量块，并对所述第二向量块进行序列变化，以生成待传输的第二符号序列，其中，所述第二待传输的比特块为所述第二格式的NB-PDCCH中待传输的比特块。
具体的，所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，具体包括：
所述基站将所述待传输的第二符号序列映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中。
进一步地，本发明实施例提供的物理下行信道的发送方法还包括：
若所述基站在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则所述基站在所述第n+a个或n-a 个下行子帧的空白符号发送所述NB-PDCCH；
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
进一步地，本发明实施例提供的物理下行信道的发送方法还包括：所述基站在预设的聚合窗口中发送所述NB-PDCCH。
所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述基站在预设的聚合窗口中发送所述NB-PDCCH之前，所述基站向所述用户终端发送第一配置信息。
所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间 偏移量。
进一步地，所述基站在预设的聚合窗口中发送所述NB-PDCCH之前，所述基站向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
本发明第二实施例提供一种物理下行信道的发送方法，基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行共享信道NB-PDSCH，在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则所述基站在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDSCH。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
本发明实施例中基站在向用户终端发送NB-PDSCH时，将向用户终端发送的其他包含有空白符号的子帧中的空白符号全部利用，并用这些空白符号发送NB-PDSCH，提高了资源的利用率。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
进一步地，本发明实施例提供的物理下行信道的发送方法还包括：所述基站在预设的聚合窗口中发送所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个资源单元RE组成，且 c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述基站在预设的聚合窗口中发送所述NB-PDSCH之前，所述基站向所述用户终端发送第一配置信息。
所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述基站在预设的聚合窗口中发送所述NB-PDSCH之前，所述基站向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
本发明第三实施例提供一种物理下行信道的接收方法，用户终端接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行控制信道NB-PDCCH。
其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
本发明实施例中用户终端接收基站发送的NB-PDCCH是映射在 NB-PDCCH映射基本单元上的，NB-PDCCH映射基本单元在频率上为带宽小于或等于180kHz的第一频率资源或者为一个资源块包含的频率资源，一个资源块的频率资源的带宽为180kHz，因此，本发明实施例中用户终端接收到的NB-PDCCH是映射在频率资源小于或等于180kHz的频率资源上的，实现了在NBIOT系统中传输PDCCH，解决了现有技术中PDCCH无法支持在窄带带宽内发送的问题。
具体的，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1。
所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中接收；
或者，
所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中接收。
具体的，所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述P为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
具体的，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
具体的，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述用户终端在所述第n个下行子帧或第n个子帧内的DwPTS内监测第一候选NB-PDCCH和/或第二候选NB-PDCCH，所述第一候选NB-PDCCH或所述第二候选NB-PDCCH包含m个RE。
具体的，所述第一格式的NB-PDCCH映射在所述第一候选NB-PDCCH的可用RE或所述第二候选NB-PDCCH的可用RE中，所述可用RE为不包含参考信号的RE。
其中，所述第一候选NB-PDCCH包含所述第一NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第二NB-CCE的所有RE；
或者，
所述第一候选NB-PDCCH包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
具体的，若所述NB-PDCCH为第二格式的NB-PDCCH，则所述第二格式的NB-PDCCH映射在第一NB-CCE的可用RE和第二NB-CCE的可用RE中，所述可用RE为不包含参考信号的RE。
进一步地，本发明实施例提供的物理下行信道的接收方法还包括：所述用户终端接收所述基站在第n+a个或n-a个下行子帧的空 白符号上发送的所述NB-PDCCH，所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
进一步地，本发明实施例提供的物理下行信道的接收方法还包括：所述用户终端在预设的聚合窗口内接收或监测所述NB-PDCCH。
所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDCCH之前，所述用户终端接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设 的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDCCH之前，所述用户终端接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
本发明第四实施例提供一种物理下行信道的接收方法，用户终端接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行共享信道NB-PDSCH，接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDSCH；所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
用户终端接收基站发送的空白符号映射有NB-PDSCH的第n+a或n-a个下行子帧，且该第n+a或n-a个下行子帧用于发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，这样利用了通信系统中空白符号的资源，提高了资源利用率。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
进一步地，本发明实施例提供的物理下行信道的接收方法还包 括：所述用户终端在预设的聚合窗口内接收或监测所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
本发明第五实施例提供一种基站，包括发送单元。
具体的，本发明实施例提供的单元模块所实现的功能具体如下：
发送单元，用于在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行控制信道NB-PDCCH；其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
本发明实施例提供的基站的技术效果可以参见上述第一实施例中基站执行的物理下行信道的发送方法中描述的基站的技术效果，此处不再赘述。
具体的，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1；
所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中发送；
或者，
所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中发送。
具体的，所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或所述第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1 个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述p为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
具体的，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
具体的，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述基站归属的通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个或两个候选NB-PDCCH。
具体的，若所述NB-PDCCH为第二格式的NB-PDCCH，则所述基站归属的通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个候选NB-PDCCH。
进一步地，所述基站还包括处理单元。
所述处理单元，用于若所述NB-PDCCH为第一格式的NB-PDCCH，则将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
其中，所述第一资源单元组包含所述第一NB-CCE的所有RE，所述第二资源单元组包含所述第二NB-CCE的所有RE；
或者，
所述第一资源单元组包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二资源单元组包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
进一步地，所述处理单元，还用于在将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中之前，对第一待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，所述第一待传输的比特块为 所述第一格式的NB-PDCCH中待传输的比特块，以及对所述第一向量块进行序列变化，以生成待传输的第一符号序列。
进一步地，所述处理单元，具体用于将所述待传输的第一符号序列映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中。
进一步地，所述处理单元，用于若所述NB-PDCCH为第二格式的NB-PDCCH，则将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
进一步地，所述处理单元，具体用于将所述第二格式的NB-PDCCH依次映射在所述第一NB-CCE的可用RE中和第二NB-CCE的可用RE中；或者，将所述第二格式的NB-PDCCH依次在所述第n个下行子帧或第n个子帧内的DwPTS内的每个符号的可用RE中映射。
进一步地，所述处理单元，还用于在将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中之前，对第二待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第二向量块，所述第二待传输的比特块为所述第二格式的NB-PDCCH中待传输的比特块，以及用于对所述第二向量块进行序列变化，以生成待传输的第二符号序列。
进一步地，所述处理单元，具体用于将所述待传输的第二符号序列映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中。
进一步地，所述发送单元，还用于若在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDCCH。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包 含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
进一步地，所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDCCH。
所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDCCH之前，向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDCCH之前，向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
本发明第六实施例提供一种基站，包括发送单元。
具体的，本发明实施例提供的单元模块所实现的功能具体如下：
发送单元，用于在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行共享信道NB-PDSCH，以及用于在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDSCH。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
本发明实施例提供的基站的技术效果可以参见上述第二实施例中基站执行的物理下行信道的发送方法中描述的基站的技术效果，此处不再赘述。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
进一步地，所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个资源单元RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子 帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDSCH之前，向所述用户终端发送第一配置信息。
所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDSCH之前，向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
本发明第七实施例提供一种用户终端，包括接收单元。
具体的，本发明实施例提供的单元模块所实现的功能具体如下：
接收单元，用于接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行控制信道NB-PDCCH。
其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
本发明实施例提供的用户终端的技术效果可以参见上述第三实施例中用户终端执行的物理下行信道的接收方法中描述的用户终端的技术效果，此处不再赘述。
具体的，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1。
具体的，所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中接收；
或者，
所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中接收。
具体的，所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述P为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
具体的，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
进一步地，所述用户终端还包括处理单元。
所述处理单元，用于若所述NB-PDCCH为第一格式的NB-PDCCH，则在所述第n个下行子帧或第n个子帧内的DwPTS内监测第一候选NB-PDCCH和/或第二候选NB-PDCCH，所述第一候选NB-PDCCH或所述第二候选NB-PDCCH包含m个RE。
具体的，所述第一格式的NB-PDCCH映射在所述第一候选NB-PDCCH的可用RE或所述第二候选NB-PDCCH的可用RE中，所述可用RE为不包含参考信号的RE。
其中，所述第一候选NB-PDCCH包含所述第一NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第二NB-CCE的所有RE；
或者，
所述第一候选NB-PDCCH包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
进一步地，所述用户终端还包括处理单元。
所述处理单元，用于若所述NB-PDCCH为第二格式的NB-PDCCH，则将所述第二格式的NB-PDCCH映射在第一NB-CCE的可用RE和第二NB-CCE的可用RE中，所述可用RE为不包含参考信号的RE。
进一步地，所述接收单元，还用于接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDCCH；所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子 帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
进一步地，所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH。
所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH之前，接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH之前，接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监 测所述NB-PDCCH。
本发明第八实施例提供一种用户终端，包括接收单元。
具体的，本发明实施例提供的单元模块所实现的功能具体如下：
接收单元，用于接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行共享信道NB-PDSCH和接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDSCH，所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
本发明实施例提供的用户终端的技术效果可以参见上述第四实施例中用户终端执行的物理下行信道的接收方法中描述的用户终端的技术效果，此处不再赘述。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
进一步地，所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量， b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第一配置信息。
所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第二配置信息。
所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
本发明第九实施例提供一种基站，包括接口电路、处理器、存储器和系统总线；所述接口电路、所述处理器、所述存储器与所述系统总线连接，当所述基站运行时，所述基站执行如上述第一实施例所述的物理下行信道的发送方法或者执行如上述第二实施例所述的物理下行信道的发送方法。
本发明实施例提供的基站的技术效果可以参见上述第一实施例中基站执行的物理下行信道的发送方法中描述的基站的技术效果或上述第二实施例中基站执行的物理下行信道的发送方法中描述的基站的技术效果，此处不再赘述。
本发明第十实施例提供一种用户终端，包括接口电路、处理器、存储器和系统总线；所述接口电路、所述处理器、所述存储器与所述系统总线连接，当所述用户终端运行时，所述用户终端执行如上述第三实施例所述的物理下行信道的接收方法或者执行如上述第四实施例所述的物理下行信道的接收方法。
本发明实施例提供的用户终端的技术效果可以参见上述第三实施例中用户终端执行的物理下行信道的接收方法中描述的用户终端的技术效果或上述第四实施例中用户终端执行的物理下行信道的接收方法中描述的用户终端的技术效果，此处不再赘述。
本发明第十一实施例提供一种通信系统，包括如上述第九实施例所述的基站以及如上述第十实施例所述的用户终端，所述基站与所述用户终端之间通过网络连接。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例。
图1为本发明实施例提供的第一类型帧结构的结构示意图；
图2为本发明实施例提供的第二类型帧结构的结构示意图；
图3为本发明实施例提供的下行资源格的结构示意图；
图4为本发明实施例提供的通信系统的结构示意图；
图5为本发明实施例提供的物理下行信道的传输方法的流程示意图一；
图6为LTE系统中普通CP时天线端口的资源映射示意图；
图7为LTE系统中扩展CP时天线端口的资源映射示意图；
图8为本发明实施例提供的普通CP时天线端口的资源映射示意图；
图9为本发明实施例提供的扩展CP时天线端口的资源映射示意图；
图10为本发明实施例提供的普通CP时NB-CCE包含RE的结构示意图一；
图11为本发明实施例提供的普通CP时NB-CCE包含RE的结构示意图二；
图12为本发明实施例提供的扩展CP时NB-CCE包含RE的结构示意图一；
图13为本发明实施例提供的扩展CP时NB-CCE包含RE的结构示意图二；
图14为本发明实施例提供的普通CP时NB-CCE包含RE的结构示意图三；
图15为本发明实施例提供的普通CP时NB-CCE包含RE的结构示意图四；
图16为本发明实施例提供的扩展CP时NB-CCE包含RE的结构示意图三；
图17为本发明实施例提供的扩展CP时NB-CCE包含RE的结构示意图四；
图18为本发明实施例提供的空白符号映射资源的结构示意图一；
图19为本发明实施例提供的空白符号映射资源的结构示意图二；
图20为本发明实施例提供的物理下行信道的传输方法的流程示意图二；
图21为本发明实施例提供的基站的结构示意图一；
图22为本发明实施例提供的基站的结构示意图二；
图23为本发明实施例提供的基站的结构示意图三；
图24为本发明实施例提供的用户终端的结构示意图一；
图25为本发明实施例提供的用户终端的结构示意图二；
图26为本发明实施例提供的用户终端的结构示意图三；
图27为本发明实施例提供的通信系统的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。
本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于限定 特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
以下描述中，为了说明而不是为了限定，提出了诸如特定系统结构、接口、技术之类的具体细节，以便透切理解本发明。然而，本领域的技术人员应当清楚，在没有这些具体细节的其它实施例中也可以实现本发明。在其它情况中，省略对众所周知的移动设备、电路以及方法的详细说明，以免不必要的细节妨碍本发明的描述。
另外，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在LTE系统中，PDCCH传输的物理资源是以CCE(Control Channel Element，控制信道单元)为单位的，一个CCE包含9个REG(Resource Element Groups，资源单元组)，每个REG由同一个OFDM(Orthogonal Frequency Division Multiplexing，正交频分复用)符号内连续的4个RE(Resource Element，资源单元)组成。其中，REG在整个LTE系统带宽的频率资源上按照频率增加的方向顺序编号。
如果在一个REG的内部存在小区特定的参考信号CRS(Cell-Specific Reference Signal)，那么该REG是表示由同一个OFDM符号内除了CRS之外的连续4个RE。
需要说明的是，如果小区中配置的CRS是单天线端口的CRS，在计算REG中包含的RE的数量时，需排除两个天线端口的CRS，例如小区中配置的是天线端口0和天线端口1的CRS，则在计算REG包含的RE的数量时，将天线端口0和天线端口1的CRS排除。如果小区中配置的CRS是两个天线端口或者四个天线端口的CRS，在计 算REG中包含的RE的数量时，排除CRS时的数量是按照根据实际情况中小区配置天线端口的CRS的数量确定。
系统中可用的CCE的数量NCCE可以理解为：系统中除PCFICH(Physical Control Format Indicator Channel，物理控制格式指示信道)和PHICH(Physical HARQ Indicator Channel，HARQ指示物理信道)占用的REG以外的所有REG的数量除以9，其中，PCFICH占用的REG的数量为4，PHICH不一定占用REG。
具体的，系统中可用的CCE的数量可以用如下公式表示：
Figure PCTCN2016073703-appb-000001
其中，NREG系统中除PCFICH和PHICH占用的REG以外的所有REG的数量，
Figure PCTCN2016073703-appb-000002
为下取整符号。
在LTE系统中，CCE的编号是连续的,编号从0开始到NCCE-1。PDCCH所占用的CCE的数量取决于终端所处的下行信道环境。对于下行信道环境好的终端，基站可能只需分配一个CCE；对于下行信道环境较差的终端，基站可能需要为之分配多达8个CCE。
为了简化终端在解码PDCCH时的复杂度，LTE系统中还规定占用N个CCE的PDCCH，其起始位置的CCE的索引必须是N的整数倍。
在LTE系统中，一个PDCCH可能占用1、2、4或者8个CCE。具体的，PDCCH的格式如表1所示。
表1
PDCCH格式 CCE的数量 REG的数量
0 1 9
1 2 18
2 3 36
3 4 72
从上面描述可以看出，现有技术中，PDCCH传输的物理资源是在LTE系统的整个带宽内发送的。LTE系统的标准带宽为1.4MHz，3MHz，5MHz，10MHz，15MHz和20MHz，因此，PDCCH传输的物理资源占用的最小的带宽为最小的系统标准带宽，即1.4MHz。
而NBIOT系统的带宽为180kHz，因此，现有LTE系统中的PDCCH是无法支持在这么窄带的带宽内发送物理资源的。
针对上述问题，本发明实施例提供了一种物理下行信道的传输方法、装置及系统，基站在第n个下行子帧或第n个子帧内的DwPTS(Downlink Pilot Time Slot，下行链路导频时隙)向用户终端发送NB-PDCCH(Narrowband Physical Downlink Control Channel，窄带物理下行控制信道)，其中，NB-PDCCH映射频率资源的带宽小于或等于180kHz的NB-PDCCH映射基本单元上。这样即可实现在NBIOT系统中传输PDCCH。
其中，为了和LTE系统区别，本发明实施例将LTE系统中的PBCH(Physical Broadcast Channel,物理下行广播信道)、PSS(Primary Synchronization Signal，主同步信号)、SSS(Secondary Synchronization Signal，辅同步信号)、PDCCH和PDSCH在NBIOT系统中分别命名为窄带物理广播信道NB-PBCH、窄带主同步信号NB-PSS、窄带辅同步信号NB-SSS、窄带物理下行控制信道NB-PDCCH和窄带物理下行共享信道NB-PDSCH。
需要说明的是，上述信道的名称和信号的名称仅仅是一个示例，其主要用于区分LTE系统和NBIOT系统，本发明对NBIOT系统中的各个信道和各个信号具体采用哪些名称不作具体限定。
为了方便理解本发明实施例，首先在此介绍本发明实施例中会涉及的相关要素。
在LTE系统和NBIOT系统中，帧结构的类型包括适用于FDD(Frequency Division Duplex，频分双工)系统的第一类型帧结构和适用于TDD(Time Division Duplex，时分双工)系统的第二类型帧结构。
具体的，如图1所示，在第一类型帧结构中，一个无线帧的时间长度为10毫秒，一个无线帧由20个时隙组成，每个时隙为0.5毫秒，两个连续的时隙为一个子帧，也就是说，第一类型帧结构包括10个子帧，每个子帧的长度为1毫秒。
如图2所示，在第二类型帧结构中，一个无线帧的时间长度为10毫秒，一个无线帧由两个长度为5毫秒的半帧组成，每个半帧由5个1毫秒的子帧组成。
第二类型帧结构包括下行子帧、特殊子帧和上行子帧。特殊子帧包括DwPTS、UpPTS(Uplink Pilot Time Slot，上行链路导频时隙)和保护间隔GP(Guard period)。
其中，特殊子帧内DwPTS始终用于发送下行，UpPTS始终用于发送上行，GP为下行转上行的保护时间，三者加起来总的长度为1毫秒。
具体的，第二类型帧结构的上下行配置如下表2所示，其中，D表示下行子帧，S表示特殊子帧，U表示上行子帧。
当下行转上行的切换点是以5毫秒为周期时，特殊子帧在两个半帧内都存在，当下行转上行的切换点是以10毫秒为周期时，特殊子帧仅在第一个半帧内存在。
其中，第二类型帧结构的特殊子帧中DwPTS、GP和UpPTS的长度如下表3所示。
其中，在第一类型帧结构和第二类型帧结构中，每个子帧内包含的OFDM符号的数量根据CP(Cyclic Prefix，循环前缀)的长度不同而不同。
当CP为普通CP时，每个时隙包含7个OFDM符号；当CP为扩展CP时，每个时隙包含6个OFDM符号。
每个时隙内发送的信号都可以用一个或者多个RG(Resource Grid，资源格)描述。
如图3所示，每个资源格由
Figure PCTCN2016073703-appb-000003
个子载波和
Figure PCTCN2016073703-appb-000004
个OFDM符号组成，
Figure PCTCN2016073703-appb-000005
的取值取决于下行配置的传输带宽并且满足
Figure PCTCN2016073703-appb-000006
系统中最小的下行带宽
Figure PCTCN2016073703-appb-000007
等于6，最大的下行带宽
Figure PCTCN2016073703-appb-000008
等于110。
其中，每个时隙内包含的OFDM的符号的数量
Figure PCTCN2016073703-appb-000009
取决于循环前缀的长度和子载波的间隔，如表4所示。
表2
Figure PCTCN2016073703-appb-000010
RG中的每个单元称为一个RE(Resource Element，资源单元)，每个RE由一个时隙中的索引对(k,l)来标识，其中，
Figure PCTCN2016073703-appb-000011
Figure PCTCN2016073703-appb-000012
k和l分别是在频率域和时间域上的索引。
RB(Resources Block，资源块)用于描述某一个物理信道到资源单元的映射。一个RB在时间上包含
Figure PCTCN2016073703-appb-000013
个连续的OFDM符号，在频率域上包含
Figure PCTCN2016073703-appb-000014
个连续的子载波，其中，
Figure PCTCN2016073703-appb-000015
和
Figure PCTCN2016073703-appb-000016
的取值如表4所示。因此，一个RB由
Figure PCTCN2016073703-appb-000017
个RE组成。一个RB在时间域上对应一个时隙，在频率域上对应180kHz。
具体的，RB的编号在频率域上从0到
Figure PCTCN2016073703-appb-000018
一个时隙中在频率域上RB的序号nPRB和资源单元(k,l)的关系可以表示为：
Figure PCTCN2016073703-appb-000019
表3
Figure PCTCN2016073703-appb-000020
其中，TS为LTE系统中时域的基本单位，Ts＝1/(15000*2048)秒。
表4
Figure PCTCN2016073703-appb-000021
本发明实施例适用的应用场景根据使用的频率资源的不同，大致可以分为以下三种应用场景：
1、独立部署场景，NBIOT系统专用的频率资源组网支持新的两种终端，所用频率资源可以是位于从GSM(Global System for Mobile Communication，全球移动通信系统)系统中回收重新利用的频段，或者是位于3G(3rd-Generation，第三代移动通信技术)系统或是LTE系统所用的频段资源。
2、保护带部署场景，NBIOT系统所使用的频率资源位于LTE系统使用的频段的保护带内。
3、带内部署场景，NBIOT系统所使用的频率资源位于LTE系统的一个标准载波，如10MHz或20MHz的带宽之内，即LTE系统的一个标准载波内同时支持普通LTE终端以及新的两种终端类型中的一种或两种。
在第三种应用场景中，为了不影响普通LTE终端的正常通信，NBIOT系统发送物理下行信道能使用的最大发送功率可能更小。
图4是本发明实施例提供的通信系统的结构示意图。参见图4，该通信系统包括基站101以及一个或多个用户终端102，用户终端102与基站101之间通过通信信道103进行通信。
其中，本发明实施例中的用户终端102是指射频支持的带宽比较小的用户终端。
可选的，本发明实施例中的用户终端102上行支持正交子载波间隔为3.75kHz的单个子载波的SC-FDMA发送或子信道带宽为3.75kHz的单个子信道的FDMA发送，或用户终端102上行支持正交子载波间隔为15kHz的单个子载波SC-FDMA发送，亦或用户终端102上行支持正交子载波间隔为15kHz的多个子载波SC-FDMA的发送。
其中，基站101具有共享信道的调度功能，具有基于发送到用户终端102的分组数据的历史来建立调度，调度就是在多个用户终端102共用传输资源时，需要有一种机制来有效地分配物理层资源，以获得统计复用增益。
用户终端102通过与基站101之间建立的通信信道103发送和接收数据。用户终端102根据通过调度控制信道发送的信息，进行共享信道的发送或接收处理。另外，用户终端102可以是移动台，手机、计算机以及便携终端等等，且该用户终端102的类型可以相同，也可以不同。
基站101与用户终端102之间通过通信信道103进行数据的接收和发送，该通信信道103可以是无线通信信道，且在无线通信信 道中，通信信道103至少存在共享信道和调度控制信道，共享信道是为了发送和接收分组而在多个用户终端102之间公用，调度控制信道用于发送共享信道的分配、以及相应的调度结果等。
实施例一
图5为本发明实施例提供的一种物理下行信道的传输方法的流程示意图，该传输方法包括发送方法和接收方法，且该传输方法应用于如图4所示的通信系统中。
S101、基站在第n个下行子帧或第n个子帧内的DwPTS向用户终端发送NB-PDCCH，n≥1。
S102、用户终端接收基站在第n个下行子帧或第n个子帧内的DwPTS内发送的NB-PDCCH。
本发明实施例中的NB-PDCCH承载NB-PDSCH的调度分配信息和其他控制信息。其中，调度分配信息用于调度承载下行数据的NB-PDSCH或承载上行数据的窄带上行共享信道NB-PUSCH。
在步骤S101中，基站向用户终端发送NB-PDCCH。
具体的，基站在向用户终端发送NB-PDCCH时，基站将该NB-PDCCH映射在NB-PDCCH映射基本单元上。
其中，NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个OFDM符号，第一频率资源的带宽小于或等于180kHz，第二频率资源为1个RB包含的频率资源。
具体的，NB-PDCCH映射基本单元由第一NB-CCE和/或第二NB-CCE组成，本发明实施例中的NB-PDCCH在一个或两个NB-CCE上传输。
其中，本发明实施例中NB-PDCCH的格式如表5所示。
表5
NB-PDCCH的格式 NB-CCE的数量
0 1
1 2
表5中，NB-PDCCH的格式为0时，NB-PDCCH在一个NB-CCE中发送；NB-PDCCH的格式为1时，NB-PDCCH在两个NB-CCE中发送。
为了描述方便，本发明实施例将格式为0的NB-PDCCH称为第一格式的NB-PDCCH，将格式为1的NB-PDCCH称为第二格式的NB-PDCCH。
需要说明的是，本发明实施例所提到的NB-PDCCH在一个NB-CCE上传输是指NB-PDCCH占用的RE的数量与一个NB-CCE所包含的可用RE的数量相同。
同理，本发明实施例所提到的NB-PDCCH在两个NB-CCE上传输是指NB-PDCCH占用的RE的数量与两个NB-CCE所包含的可用RE的数量相同。
其中，可用RE是指NB-CCE所包含的RE中除去参考信号占用的RE外剩余的RE。
参考信号包括CRS和/或CSI-RS(Channel State Information-Reference Signal，信道状态信息参考信号)。
在带内部署场景中，CRS包括LTE系统使用的CRS和NBIOT系统使用的窄带参考信号NB-RS，CSI-RS包括LTE系统使用的CSI-RS，或同时包含NBIOT系统使用的窄带NB-CSI-RS。
在独立部署或保护带部署场景中，CRS可能仅包含NBIOT系统使用的窄带参考信号NB-RS，CSI-RS可能仅包含NBIOT系统使用的窄带NB-CSI-RS。
具体的，LTE系统中的下行参考信号包括CRS和CSI-RS。其中，CRS在小区支持PDSCH的所有下行子帧内传输，且在1个或者多个天线端口上传输。
参考信号序列
Figure PCTCN2016073703-appb-000022
被定义为：
Figure PCTCN2016073703-appb-000023
其中，
Figure PCTCN2016073703-appb-000024
为最大的下行带宽配置，ns为1个无线帧(Radio Frame)里时隙编号，l为一个时隙中OFDM符号的编号，c(i)为伪随机序列且被定义为一个长度为31的Glod序列。
具体的，一个长度为MPN的输出序列c(n)被定义为：
c(n)＝(x1(n+NC)+x2(n+NC))mod2
x1(n+31)＝(x1(n+3)+x1(n))mod2
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
其中，n＝0,1,...,MPN-1,NC＝1600，mod为求余运算符。
第一个m序列被初始化为x1(0)＝1,x1(n)＝0,n＝1,2,...,30；第二个m序列的初始值表示为
Figure PCTCN2016073703-appb-000025
在每个OFDM开始时，第二个m序列都会采用这个初始值初始化产生CRS，其中，
Figure PCTCN2016073703-appb-000026
为物理层小区标识且
Figure PCTCN2016073703-appb-000027
参考信号序列
Figure PCTCN2016073703-appb-000028
将被映射成复数值的调制符号
Figure PCTCN2016073703-appb-000029
该调制时隙ns天线端口p的参考符号，映射关系为
Figure PCTCN2016073703-appb-000030
其中，
k＝6m+(v+vshift)mod6
Figure PCTCN2016073703-appb-000031
Figure PCTCN2016073703-appb-000032
Figure PCTCN2016073703-appb-000033
变量v和vshift定义不同的参考信号在频率域上的位置，其中，
Figure PCTCN2016073703-appb-000034
小区特定的频率移位满足
Figure PCTCN2016073703-appb-000035
mod为求余运算符。
将上述映射方式以图的形式表现，在下行子帧的CP类型为普通CP时，一个天线端口、两个天线端口和四个天线端口发送的CRS映射到RE的结构示意图如图6所示。在下行子帧的CP类型为扩展CP时，一个天线端口、两个天线端口和四个天线端口发送的CRS映射到RE的结构示意图如图7所示。
具体的，本发明实施例中的NB-RS在小区支持NB-PDSCH的所有下行子帧或者包含DwPTS子帧的DwPTS内传输，且NB-RS只在一个RB内映射并发送。
具体的，NB-RS在一个天线端口上传输或者在两个天线端口上传输。
NB-RS序列
Figure PCTCN2016073703-appb-000036
被定义为：
Figure PCTCN2016073703-appb-000037
其中，
Figure PCTCN2016073703-appb-000038
为最大的下行带宽配置，即
Figure PCTCN2016073703-appb-000039
即公式中m＝0,1，ns为1个无线帧里时隙编号，l为一个时隙中OFDM符号的编号。c(i)为伪随机序列且被定义为一个长度为31的Glod序列。
具体的，一个长度为MPN的输出序列c(n)被定义为：
c(n)＝(x1(n+NC)+x2(n+NC))mod2
x1(n+31)＝(x1(n+3)+x1(n))mod2
x2(n+31)＝(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
其中，n＝0,1,...,MPN-1,NC＝1600，mod为求余运算符。
第一个m序列被初始化为x1(0)＝1,x1(n)＝0,n＝1,2,...,30，第二个m 序列的初始值是由输入参数至少为物理层小区标识和循环前缀类型中的一个组成的函数确定的数值。例如，初始值为
Figure PCTCN2016073703-appb-000040
在每个OFDM开始时，第二个m序列都会采用这个初始值初始化产生NB-RS，其中，
Figure PCTCN2016073703-appb-000041
为物理层小区标识且
Figure PCTCN2016073703-appb-000042
参考信号序列
Figure PCTCN2016073703-appb-000043
将被映射成复数值的调制符号
Figure PCTCN2016073703-appb-000044
该调制符号时隙ns天线端口p的参考符号，映射关系为
Figure PCTCN2016073703-appb-000045
其中，k＝6m+(v+vshift)mod6，
Figure PCTCN2016073703-appb-000046
Figure PCTCN2016073703-appb-000047
或l＝2，
Figure PCTCN2016073703-appb-000048
当循环前缀为普通循环前缀时，l＝3,
Figure PCTCN2016073703-appb-000049
或l＝3，
Figure PCTCN2016073703-appb-000050
变量v和vshift定义不同的参考信号在频率域上的位置，其中，
Figure PCTCN2016073703-appb-000051
小区特定的频率移位满足
Figure PCTCN2016073703-appb-000052
将上述映射方式以图的形式表现，若CP为普通CP时，则一个天线端口和两个天线端口NB-RS的映射示意图如图8所示，其中，l＝2，
Figure PCTCN2016073703-appb-000053
若CP为扩展CP，则一个天线端口和两个天线端口NB-RS的映射示意图如图9所示，其中，l＝2，
Figure PCTCN2016073703-appb-000054
具体的，本发明实施例中第一NB-CCE和第二NB-CCE均包含m个RE。
其中，m个RE由x*y个RE组成，x代表时间域中第n个下行子帧或第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或第n个子帧内的DwPTS每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧 为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH或窄带主同步信号NB-PSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个连续OFDM符号。
若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或5个连续OFDM符号。
在带内部署场景中，x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述p为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
其中，基站在前p个连续的OFDM符号上发送LTE系统的控制信道，包括PDCCH，PCFICH(Physical Control Format Indicator Channel，物理控制信息格式信道)和PHICH(Physical Hybrid ARQ Indicator Channel，物理混合自动重传指示信道)中的至少一个。
可选的，p的数值为预设的数值，p等于3或4。其中，预设是指在标准文本中明确规定。
在独立部署场景或保护带部署场景中，本发明实施例中的x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量。
具体的，下行为普通CP时，x个OFDM符号为所述第n个下行子帧所包含14个OFDM符号。
下行为普通CP时，在第n个子帧的DwPTS内，x的数值由表格3中特殊子帧的配置决定。例如：在特殊子帧配置0或5时，x的数值为3；在特殊子帧配置1或6时，x的数值为9；特殊子帧配置2或7时，x的数值为10；特殊子帧配置3或8时，x的数值为11，特殊子帧配置4时，x的数值为12。
当下行为扩展CP时，x个OFDM符号为所述第n个下行子帧所包含12个OFDM符号。
当下行为扩展CP时，在第n个子帧的DwPTS内，x的数值由表格3中特殊子帧的配置决定。例如：特殊子帧配置0或4时，x的数值为3；特殊子帧配置1或5时，x的数值为8；特殊子帧配置2或6时，x的数值为9；特殊子帧配置3时，x的数值为10。
本发明实施例中，第一NB-CCE或第二NB-CCE在m个RE中的每个OFDM符号上包含连续的6个子载波，且第一NB-CCE在m个RE中的每个OFDM符号上包含连续的6个子载波和第二NB-CCE在m个RE中的每个OFDM符号上包含连续的6个子载波都不重叠，且第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
具体的，若k为一个RB中的子载波的索引，l为一个时隙中OFDM符号的索引，则第一NB-CCE和第二NB-CCE包含的RE均可以表示为(k,l)。
在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同的场景中，若系统下行配置为普通CP，则第一NB-CCE包含的RE为(k,l)，其中，k＝0,1,2,3,4,5且l＝0,1,2,3,4,5,6；第二NB-CCE包含的RE为(k,l)，其中，k＝6,7,8,9,10,11且l＝0,1,2,3,4,5,6。
示例性的，在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同的场景中，若系统下行配置为普通CP，图10示出了LTE系统配置单天线端口或者两个天线端口的CRS、 NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同的场景中，若系统下行配置为普通CP，图11示出了LTE系统配置四个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
同理，在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同的场景中，若系统下行配置为扩展CP，则第一NB-CCE包含的资源RE为(k,l)，其中，k＝0,1,2,3,4,5且l＝0,1,2,3,4,5；第二NB-CCE包含的RE为(k,l)，其中，k＝6,7,8,9,10,11且l＝0,1,2,3,4,5。
示例性的，在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同的场景中，若系统下行配置为扩展CP，图12示出了LTE系统配置单天线端口或者两个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同的场景中，若系统下行配置为扩展CP，图13示出了LTE系统配置四个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
本发明实施例中的第一预设规则为第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引每间隔一个OFDM符号发生变化，或者，第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引根据预设公式确定。
具体的，第一预设规则为第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引每间隔一个OFDM符号发生变化，则在系统下行配置为普通CP的场景中，第一NB-CCE包含的RE为(k,l)，其中，第一NB-CCE在第一个时隙内k＝0,1,2,3,4,5且l＝0,2,4,6，在第二个时隙内k＝0,1,2,3,4,5且l＝1,3,5；第二NB-CCE包含的RE为(k,l)，第二NB-CCE在第一个时隙内k＝6,7,8,9,10,11且l＝1,3,5，在第二个时隙内k＝6,7,8,9,10,11且l＝0,2,4,6。
示例性的，在第一NB-CCE或第二NB-CCE在每个OFDM符号中包 含的6个子载波的索引每间隔一个OFDM符号发生变化的场景中，若系统下行配置为普通CP，图14示出了LTE系统配置单天线端口或者两个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引每间隔一个OFDM符号发生变化的场景中，若系统下行配置为普通CP，图15示出了LTE系统配置四个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
同理，若第一预设规则为第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引每间隔一个OFDM符号发生变化，则在系统下行配置为扩展CP的场景中，第一NB-CCE包含的资源RE为(k,l)，其中，第一NB-CCE在第一个时隙内k＝0,1,2,3,4,5且l＝0,2,4，在第二个时隙内k＝0,1,2,3,4,5且l＝1,3,5；第二NB-CCE包含的资源集合为(k,l)，其中，第二NB-CCE在第一个时隙内k＝6,7,8,9,10,11且l＝1,3,5，在第二个时隙内k＝6,7,8,9,10,11且l＝0,2,4。
示例性的，在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引每间隔一个OFDM符号发生变化的场景中，若系统下行配置为扩展CP，图16示出了LTE系统配置单天线端口或者两个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
在第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引每间隔一个OFDM符号发生变化的场景中，若系统下行配置为扩展CP，图17示出了LTE系统配置四个天线端口的CRS、NBIOT系统配置两个天线端口的NB-RS时的资源映射结构。
具体的，若第一预设规则为第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引根据预设公式确定，则该预设公式可以表示为6×(Ylmod2)+i，其中，i＝0,1,…,5,mod为求余运算符，变量Yl被定义为Yl＝(A·Yl-1)modD，Y-1＝nRNTI，且nRNTI≠0，nRNTI为用户终端的RNTI(Radio Network Temporary Identifier，无线网络 临时标识)的数值，A和D为质数，如A＝39827，D＝65537，且l为一个时隙内的OFDM符号的编号，用户终端的RNTI为C-RNTI(Cell Radio Network Temporary Identifier，小区无线网络临时标识)、SPS(Semi-Persistent Scheduling，半持续调度)C-RNTI或临时的C-RNTI。
对于第一格式的NB-PDCCH，基站将第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中，可用RE为不包含参考信号的RE。
其中，第一资源单元组包含第一NB-CCE的所有RE，第二资源单元组包含第二NB-CCE的所有RE；
或者，
第一资源单元组包含第n个下行子帧中第一个时隙的第一NB-CCE的所有RE和第二NB-CCE的所有RE，第二资源单元组包含第n个下行子帧中第二个时隙的第一NB-CCE的所有RE和第二NB-CCE的所有RE。
容易理解的是，若第n个子帧内包含第一NB-CCE和第二NB-CCE，如果第n个子帧内有一个第一格式的NB-PDCCH需要发送，则基站将第一格式的NB-PDCCH映射在第一NB-CCE的可用RE中或在NB-CCE中的可用RE中。
简单的说，如果第n个子帧内有两个NB-PDCCH需要发送，则基站决定每个需要发送的NB-PDCCH在哪个NB-CCE的可用RE中发送。
特别地，基站可以根据某一规则确定在哪个的NB-CCE的可用RE中向用户终端发送需要传输的NB-PDCCH。
示例性的，基站向用户终端发送的NB-PDCCH映射在第一或第二NB-CCE中的索引由(Yk+m)mod2决定。例如(Yk+m)mod2计算的结果为0时，则基站向用户终端发送的NB-PDCCH映射在第一NB-CCE的可用RE中；如(Yk+m)mod2计算的结果为1时，则基站向用户终端发送的NB-PDCCH映射在第二NB-CCE的可用RE中；其中，变量Yk被定义为Yk＝(A·Yk-1)modD，Y-1＝nRNTI，且nRNTI≠0，nRNTI为用户终端的RNTI的 数值，A和D为质数，如A＝39827，D＝65537，且
Figure PCTCN2016073703-appb-000055
ns为一个无线帧内的时隙的编号，用户终端的RNTI为C-RNTI、SPS C-RNTI或临时的C-RNTI。
进一步地，在基站将第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中之前，基站对第一待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，并对第一向量块进行序列变化(Permutation)，以生成待传输的第一符号序列，其中，第一待传输的比特块为第一格式的NB-PDCCH中待传输的比特块。
这样，基站将待传输的第一符号序列映射在第一资源单元组的可用RE中或第二资源单元组中的可用RE中。
需要说明的是，基站在一个子帧内最多发送两个第一格式的NB-PDCCH，这两个第一格式的NB-PDCCH可以是发送给同一个用户终端的，也可以是发送给不同用户终端的。
当基站在一个子帧内发送两个第一格式的NB-PDCCH时，两个第一个格式的NB-PDCCH分别承载的第一待传输的比特块先复用(Multiplexed)在一起，然后复用的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，并对第一向量块进行序列变化(Permutation)，以生成待传输的第一符号序列，这样，基站将待传输的第一符号序列映射在第一资源单元组的可用RE中和第二资源单元组中的可用RE中。
示例性的，
Figure PCTCN2016073703-appb-000056
为第n个子帧内第一格式的NB-PDCCH中待传输的比特块，其中，
Figure PCTCN2016073703-appb-000057
为第n个子帧内的第i个NB-PDCCH上发送的比特的数量。每个NB-PDCCH要传输的比特块复用(Multiplexed)在一起，生成比特块
Figure PCTCN2016073703-appb-000058
其中，nPDCCH为第n个子帧内NB-PDCCH的数量，在NBIOT系统中，nPDCCH等于1或2。
可选地，复用后的比特块在调制前经过NBIOT系统窄带参考信 号NB-RS加扰，并形成加扰后的比特块
Figure PCTCN2016073703-appb-000059
其中，本发明实施例在加扰过程中使用的NB-RS与前面描述的NBIOT系统中的NB-RS相同，此处不再详细介绍。
加扰的过程为
Figure PCTCN2016073703-appb-000060
其中，c(i)为加扰序列且加扰序列产生器在每个子帧的开始进行初始化且初始值为
Figure PCTCN2016073703-appb-000061
加扰后的比特块
Figure PCTCN2016073703-appb-000062
经过QPSK(Quadrature Phase Shift Keyin，正交相移键控)调制，层映射和预编码过程，生成一个向量块y(i)＝[y(0)(i) ... y(P-1)(i)]T，i＝0,...,Msymb-1，这个向量块将映射在天线端口p的资源单元上，其中，y(p)(i)表示天线端口p的信号。
向量块映射到资源单元后，该向量块会进行序列变化(Permutation)，生成待传输的符号序列，待传输的符号序列采用符号对或者符号四元组表示。
具体的，当采用符号对映射时，z(p)(i)＝〈y(p)(2i),y(p)(2i+1)〉表示天线端口p上的符号对i，符号对块表示为z(p)(0),...,z(p)(Mquad-1)，其中，Mquad＝Msymb/2经过序列变换形成w(p)(0),...,w(p)(Mquad-1)。序列变换是根据子块交织形成的。
可选的，w(p)(0),...,w(p)(Mquad-1)可以按照先在第一NB-CCE映射后在第二NB-CCE映射的顺序映射。在第一NB-CCE或第二NB-CCE中，按照先频域后时域的顺序映射，且不映射在参考信号上。需要说明的是，参考信号是指NBIOT系统窄带参考信号NB-RS；若是带内部署场景中，参考信号还包含LTE系统的CRS和/或CSI-RS。可选地，若是带内部署场景中，当在NBIOT系统的带宽内存在LTE系统的CSI-RS时，则CSI-RS对应的RE上不发送承载的NB-PDCCH的符号而是发送CSI-RS。
当采用符号四元组映射时，天线端口p上的符号四元组i用z(p)(i)＝〈y(p)(4i),y(p)(4i+1),y(p)(4i+2),y(p)(4i+3)〉表示，符号四元组块表示为z(p)(0),...,z(p)(Mquad-1)，其中，Mquad＝Msymb/4经过序列变换形成w(p)(0),...,w(p)(Mquad-1)。同理，w(p)(0),...,w(p)(Mquad-1)按照先频域后时域 的顺序映射，且不映射在参考信号上。需要说明的是，参考信号是指NBIOT系统窄带参考信号NB-RS；若是带内部署场景中，参考信号还包含LTE系统的CRS和/或CSI-RS。可选地，若是带内部署场景中，当在NBIOT系统的带宽内存在LTE系统的CSI-RS时，则CSI-RS对应的RE上不发送承载的NB-PDCCH的符号而是发送CSI-RS。
对于第二格式的NB-PDCCH，基站将第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，可用RE为不包含参考信号的RE中。
可选的，基站可以将第二格式的NB-PDCCH依次映射在第一NB-CCE的可用RE中和第二NB-CCE的可用RE中，也可以将第二格式的NB-PDCCH依次在第n个下行子帧或第n个子帧内的DwPTS内的每个符号的可用RE中映射。
进一步地，基站将第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中之前，基站还对第二待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第二向量块，并对第二向量块进行序列变化，以生成待传输的第二符号序列，其中，第二待传输的比特块为第二格式的NB-PDCCH中待传输的比特块。
示例性的，对于第二格式的NB-PDCCH，若第n个子帧内一个第二格式的NB-PDCCH中待传输的比特块为
Figure PCTCN2016073703-appb-000063
Figure PCTCN2016073703-appb-000064
经过加扰、调制、层映射和预编码过程后生成向量块，该向量块为y(i)＝[y(0)(i) ... y(P-1)(i)]T，i＝0,...,Msym b-1，基站对向量块y(i)＝[y(0)(i) ... y(P-1)(i)]T按照下述几种方法进行映射:
1、基站将向量块y(i)＝[y(0)(i) ... y(P-1)(i)]T按照先映射到在第一NB-CCE0上再映射在到NB-CCE1上的顺序映射在第一NB-CCE和第二NB-CCE中的可用RE上。
2、基站将向量块y(i)＝[y(0)(i) ... y(P-1)(i)]T按照先频域再时域的顺序映射，即按照从第一个符号上第一个可用RE开始映射，直到第一个符号上所有可用RE都已经映射后，再从第二个OFDM符号开始 映射。
3、基站将向量块y(i)＝[y(0)(i) ... y(P-1)(i)]T按照符号对或者符号四元组的形式经过序列变换形成w(p)(0),...,w(p)(Mquad-1)。基站将w(p)(0),...,w(p)(Mquad-1)按照先映射在第一NB-CCE再映射在第二NB-CCE上的顺序或者按照先频域后时域的顺序映射，且不映射在参考信号上。需要说明的是，参考信号是指NBIOT系统窄带参考信号NB-RS；若是带内部署场景中，参考信号还包含LTE系统的CRS和/或CSI-RS。可选地，若是带内部署场景中，当在NBIOT系统的带宽内存在LTE系统的CSI-RS时，则CSI-RS对应的RE上不发送承载的NB-PDCCH的符号而是发送CSI-RS。
具体的，本发明实施例中用户终端执行步骤S102，即用户终端接收基站在第n个下行子帧或第n个子帧内的DwPTS内发送的NB-PDCCH。
本发明实施例中，若NB-PDCCH为第一格式的NB-PDCCH，则通信系统中在第n个下行子帧或第n个子帧内的DwPTS内存在一个或者两个候选NB-PDCCH。若NB-PDCCH为第二格式的NB-PDCCH，则通信系统中在第n个下行子帧或第n个子帧内的DwPTS内存在一个候选NB-PDCCH。
具体的，若NB-PDCCH为第一格式的NB-PDCCH，则用户终端在第n个下行子帧或第n个子帧内的DwPTS内监测第一候选NB-PDCCH和/或第二候选NB-PDCCH。其中，第一候选NB-PDCCH或第二候选NB-PDCCH包含m个RE。
也就是说，第一格式的NB-PDCCH映射在第一候选NB-PDCCH的可用RE或第二候选NB-PDCCH的可用RE上，可用RE为不包含参考信号的RE。
其中，第一候选NB-PDCCH包含第一NB-CCE的所有RE，第二候选NB-PDCCH包含第二NB-CCE的所有RE；
或者，
第一候选NB-PDCCH包含第n个下行子帧中第一个时隙的第一 NB-CCE的所有RE和第二NB-CCE的所有RE，第二候选NB-PDCCH包含第n个下行子帧中第二个时隙的第一NB-CCE的所有RE和第二NB-CCE的所有RE。
具体的，若NB-PDCCH为第二格式的NB-PDCCH，第二格式的NB-PDCCH映射在第一NB-CCE的可用RE和第二NB-CCE的可用RE上，可用RE为不包含参考信号的RE。
进一步地，本发明实施例提供的物理下行信道的传输方法还包括：若基站在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则基站在第n+a个或n-a个下行子帧的空白符号发送NB-PDCCH。
其中，第n+a个下行子帧为第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，第n-a个下行子帧为第n个下行子帧或第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，空白符号是指发送NB-PBCH或NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
对于空白符号中的第i个OFDM符号，在第i个OFDM符号上重复发送第n个下行子帧或第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
可以理解的是，由于第二类型帧结构包括下行子帧、特殊子帧和上行子帧，因此，第二类型帧结构中存在下行子帧和上行子帧相邻的情景，本发明实施例提供的方法是针对下行子帧而言，因此，在第二类型帧结构中，第n+a个下行子帧或第n-a个下行子帧可能为与第n个下行子帧不相邻的子帧。
也就是说，本发明实施例中涉及到的连续子帧为任意两个相邻的下行子帧。
其中，在独立部署场景或保护带部署场景，每个子帧内的参考 信号只有NB-RS，在发送NB-PBCH的子帧内前3个OFDM符号不发送NB-PBCH；在发送NB-PSS的子帧内，当系统配置为普通CP时，NB-PSS发送时使用子帧内的最后11个OFDM符号，即前3个OFDM符号不发送NB-PSS；在发送NB-SSS的子帧内，当系统配置为普通CP时，NB-SSS发送时使用子帧内的最后11个或9个OFDM符号，即前3个或前5个OFDM符号不发送NB-SSS。
示例性的，如图18所示，若下行子帧n是发送NB-PDCCH的子帧且NB-PDCCH在两个或两个以上子帧内发送，如果下一个下行子帧n+a是发送NB-PBCH,NB-PSS或NB-SSS的子帧，那么基站在子帧n+a的空白OFDM符号上发送NB-PDCCH。
当空白符号为3个OFDM符号时，基站在子帧n+a的前3个OFDM符号重复发送子帧n的前3个OFDM符号上发送的NB-PDCCH。当空白符号为5个OFDM符号时，基站在子帧n+a的前5个OFDM符号重复发送子帧n的前5个OFDM符号上发送的NB-PDCCH。
具体的，如果子帧n+a是第一个可以发送NB-PDCCH的子帧，那么在子帧n+a的空白OFDM符号上发送子帧n+a后面的第一个发送NB-PDCCH的子帧的前3个OFDM符号或者前5个OFDM符号上发送的NB-PDCCH。
同理，如图18所示，若子帧n是第一个用于发送NB-PDCCH的子帧，且NB-PDCCH本应该在一个子帧内发送，但如果子帧n后面的第一个下行子帧n+a是发送NB-PBCH,NB-PSS或NB-SSS子帧，那么在子帧n+a的空白OFDM符号上发送NB-PDCCH。
其中，NB-PDCCH映射在子帧n和子帧n+a上的可用RE上，可用RE包括子帧n内不发送参考信号的RE和子帧n+a内空白OFDM符号上不发送参考信号的RE；或者NB-PDCCH映射在子帧n上的可用RE上，映射后在子帧n内的前3个或者前5个OFDM符号上发送的NB-PDCCH重复映射在子帧n+a内3个或者前5个OFDM符号上不发送参考信号的RE上。
示例性的，如图19所示，如果子帧n是发送NB-PBCH,NB-PSS 或NB-SSS子帧，如果子帧n后面的第一个下行子帧n+a是第一个可以发送NB-PDCCH的子帧且NB-PDCCH本应该在一个子帧内发送，那么在发送NB-PBCH,NB-PSS或NB-SSS子帧的空白OFDM符号上发送NB-PDCCH。
其中，NB-PDCCH映射在子帧n和子帧n+a上的可用RE上，可用资源包括子帧n空白OFDM符号上不发送参考信号的RE和子帧n+a内不发送参考信号的RE；或者NB-PDCCH映射在子帧n+a上的可用RE上，映射后在子帧n+a内的前3个或者前5个OFDM符号上发送的NB-PDCCH重复映射在子帧n内3个或者前5个OFDM符号上不发送参考信号的RE上。
进一步地，若第n个下行子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则基站在该第n个下行子帧的前3个或者前5个连续OFDM符号发送NB-PDCCH。这里，前3个或者前5个连续OFDM符号发送NB-PDCCH的方法与前面空白符号发送NB-PDCCH的方法相同，此处不再对此进行解释。
需要说明的是，使用前3个或者前5个连续OFDM符号发送的NB-PDCCH可能只适用于小区中心或者在小区中覆盖条件较好的用户终端。因此，基站可以向用户终端发送配置信息，配置信息中包含指示信息用于指示用户终端监测在空白符号上发送的NB-PDCCH。承载配置信息的信道或信令包括NB-PBCH、SI(System Information，系统信息)，RRC(Radio Resource Control,无线资源控制)信令或MAC(Media Access Control,媒体接入控制)信令中的至少一种。
相应的，若用户终端接收基站在第n+a或n-a个下行子帧发送的窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则用户终端接收基站在第n+a个或n-a个下行子帧的空白符号上发送的NB-PDCCH。
第n+a个下行子帧为第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，第n-a个下 行子帧为第n个下行子帧或第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，空白符号是指发送NB-PBCH或NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于空白符号中的第i个OFDM符号，在第i个OFDM符号上重复发送的是第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
因此，用户终端可以对在第i个OFDM符号上接收到的NB-PDSCH和在第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上接收的NB-PDSCH做联合检测，从而可以提高NB-PDSCH的检测性能，如联合检测可以包括对应符号级合并或比特级合并。
可以看出，本发明实施例提供的物理下行信道的传输方法充分利用了空白符号，能够提高资源利用率。
进一步地，本发明实施例提供的物理下行信道的传输方法还包括：基站在预设的聚合窗口中发送NB-PDCCH。
预设的聚合窗口由c*y个RE组成，且c＝b*z，c代表时间域所述预设的聚合窗口包含的连续OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
可以理解的是，预设的聚合窗口是由z个公用下行子帧的空白符号聚合而成，对于预设的聚合窗口中归属于同一个子帧的空白符号的映射与前面描述的空白符号的映射相同。
进一步地，聚合窗口中也可以包含第n个下行子帧或第n个包含DwPTS的子帧。
进一步地，在基站在预设的聚合窗口中发送NB-PDCCH之前，基站向用户终端发送第一配置信息，第一配置信息包括聚合窗口的位置信息，聚合窗口的位置信息至少包括预设的聚合窗口的时间起点位置和预设的聚合窗口的长度，或者，预设的聚合窗口的周期和时间偏移量。
具体地，承载第一配置信息的信道或信令包括NB-PBCH、SI(System Information，系统信息)，RRC(Radio Resource Control,无线资源控制)信令或MAC(Media Access Control,媒体接入控制)信令中的至少一种。
进一步地，在基站在预设的聚合窗口中发送NB-PDCCH之前，基站还向用户终端发送第二配置信息，第二配置信息指示用户终端在预设的聚合窗口内接收或监测NB-PDCCH。
具体地，承载第二配置信息的信道或信令包括NB-PBCH、SI(System Information，系统信息)，RRC(Radio Resource Control,无线资源控制)信令或MAC(Media Access Control,媒体接入控制)信令中的至少一种。
相应的，用户终端还在预设的聚合窗口内接收或监测NB-PDCCH。
预设的聚合窗口由c*y个RE组成，且c＝b*z，c代表时间域所述预设的聚合窗口包含的连续OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，用户终端在预设的聚合窗口内接收或监测NB-PDCCH之前，用户终端还接收基站发送的第一配置信息。
第一配置信息包括聚合窗口的位置信息，聚合窗口的位置信息至少包括预设的聚合窗口的时间起点位置和预设的聚合窗口的长度，或者，预设的聚合窗口的周期和时间偏移量。
进一步地，用户终端在预设的聚合窗口内接收或监测NB-PDCCH之前，用户终端还接收基站发送的第二配置信息。
第二配置信息指示用户终端在预设的聚合窗口内接收或监测NB-PDCCH。
本发明实施例提供一种物理下行信道的传输方法，基站在第n个下行子帧或第n个子帧内的DwPTS向终端发送NB-PDCCH，其中，NB-PDCCH映射频率资源的带宽小于或等于180kHz的NB-PDCCH映射基本单元上，实现了在NBIOT系统中传输PDCCH。
实施例二
图20为本发明实施例提供的一种物理下行信道的传输方法的流程示意图，该传输方法包括发送方法和接收方法，且该传输方法应用于如图4所示的通信系统中。
S201、基站在第n个下行子帧或第n个子帧内的DwPTS向用户终端发送窄带物理下行共享信道NB-PDSCH并在第n+a或n-a个下行子帧发送NB-PBCH或NB-SS，则基站在第n+a个或n-a个下行子帧的空白符号发送NB-PDSCH。
S202、用户终端接收基站在第n个下行子帧或第n个子帧内的DwPTS内发送的NB-PDSCH和基站在第n+a或n-a个下行子帧空白符号上发送的所述NB-PDSCH，且所述第n+a或n-a个下行子帧是发送NB-PBCH或NB-SS的子帧。
其中，本发明实施例中所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包 含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送的是所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
因此，用户终端可以对在第i个OFDM符号上接收到的NB-PDSCH和在第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上接收的NB-PDSCH做联合检测，从而可以提高NB-PDSCH的检测性能，如联合检测可以包括对应符号级合并或比特级合并。
可以理解的是，由于第二类型帧结构包括下行子帧、特殊子帧和上行子帧，因此，第二类型帧结构中存在下行子帧和上行子帧相邻的情景，本发明实施例提供的方法是针对下行子帧而言，因此，在第二类型帧结构中，第n+a个下行子帧或第n-a个下行子帧可能为与第n个下行子帧不相邻的子帧。
也就是说，本发明实施例中涉及到的连续子帧为任意两个相邻的下行子帧。
其中，在独立部署场景或保护带部署场景，每个子帧内的参考信号只有NB-RS，在发送NB-PBCH的子帧内前3个OFDM符号不发送NB-PBCH；在发送NB-PSS的子帧内，当系统配置为普通CP时，NB-PSS发送时使用子帧内的最后11个OFDM符号，即前3个OFDM符号不发送NB-PSS；在发送NB-SSS的子帧内，当系统配置为普通CP时，NB-SSS发送时使用子帧内的最后11个或9个OFDM符号，即前3个或前5个OFDM符号不发送NB-SSS。
示例性的，如图18所示，若下行子帧n是发送NB-PDSCH的子帧且NB-PDSCH在两个或两个以上子帧内发送，如果下一个下行子帧 n+a是发送NB-PBCH,NB-PSS或NB-SSS的子帧，那么基站在子帧n+a的空白OFDM符号上发送NB-PDSCH。
当空白符号为3个OFDM符号时，基站在子帧n+a的前3个OFDM符号重复发送子帧n的前3个OFDM符号上发送的NB-PDSCH。当空白符号为5个OFDM符号时，基站在子帧n+a的前5个OFDM符号重复发送子帧n的前5个OFDM符号上发送的NB-PDSCH。
具体的，若子帧n是发送NB-PDSCH的子帧且NB-PDSCH在两个或两个以上子帧内发送，如果下一个下行子帧n+a是发送NB-PBCH,NB-PSS或NB-SSS的子帧，那么基站在子帧n+a的空白OFDM符号上发送NB-PDSCH。
具体的，如果子帧n+a是第一个可以发送NB-PDSCH的子帧，那么在子帧n+a的空白OFDM符号上发送子帧n+a后面的第一个发送NB-PDSCH的子帧的前3个OFDM符号或者前5个OFDM符号上发送的NB-PDSCH。
同理，如图18所示，若子帧n是第一个用于发送NB-PDSCH的子帧，且NB-PDSCH本应该在一个子帧内发送，但如果子帧n后面的第一个下行子帧n+a是发送NB-PBCH,NB-PSS或NB-SSS子帧，那么在子帧n+a的空白OFDM符号上发送NB-PDSCH。
其中，NB-PDSCH映射在子帧n和子帧n+a上的可用RE上，可用RE包括子帧n内不发送参考信号的RE和子帧n+a内空白OFDM符号上不发送参考信号的RE；或者NB-PDSCH映射在子帧n上的可用RE上，映射后在子帧n内的前3个或者前5个OFDM符号上发送的NB-PDSCH重复映射在子帧n+a内3个或者前5个OFDM符号上不发送参考信号的RE上。
示例性的，如图19所示，如果子帧n是发送NB-PBCH,NB-PSS或NB-SSS子帧，如果子帧n后面的第一个下行子帧n+a是第一个可以发送NB-PDSCH的子帧且NB-PDSCH本应该在一个子帧内发送，那么在发送NB-PBCH,NB-PSS或NB-SSS子帧的空白OFDM符号上发送NB-PDSCH。
其中，NB-PDSCH映射在子帧n和子帧n+a上的可用RE上，可用资源包括子帧n空白OFDM符号上不发送参考信号的RE和子帧n+a内不发送参考信号的RE；或者NB-PDSCH映射在子帧n+a上的可用RE上，映射后在子帧n+a内的前3个或者前5个OFDM符号上发送的NB-PDSCH重复映射在子帧n内3个或者前5个OFDM符号上不发送参考信号的RE上。
进一步地，本发明实施例提供的物理下行信道的传输方法还包括：所述基站在预设的聚合窗口中发送所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个资源单元RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的连续正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
可选的，聚合窗口中不仅包含公用下行子帧，也可以进一步包含第n个下行子帧或第n个包含DwPTS的子帧。
进一步地，在所述基站在预设的聚合窗口中发送所述NB-PDSCH之前，所述基站向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的时间位置信息，所述聚合窗口的时间位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
其中，承载第一配置信息的信道或信令包括NB-PBCH、SI(System Information，系统信息)、RRC(Radio Resource Control，无线资源控制)信令和MAC(Media Access Control，媒体接入控制)信令中的至少一种。
进一步地，在所述基站在预设的聚合窗口中发送所述NB-PDSCH之前，所述基站向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
具体地，承载第二配置信息的信道或信令包括NB-PBCH、SI(System Information，系统信息)，RRC(Radio Resource Control,无线资源控制)信令或MAC(Media Access Control,媒体接入控制)信令中的至少一种。
本发明实施例提供的物理下行信道的传输方法能够充分利用空白符号，提高了资源利用率。
实施例三
本发明实施例提供一种基站1，所述基站1用于执行以上方法中的基站所执行的步骤。所述基站1可以包括相应步骤所对应的模块。如图21所示，该基站1包括：
发送单元10，用于在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行控制信道NB-PDCCH。
其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
具体的，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1。
具体的，所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中发送；
或者，
所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中发送。
具体的，所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或所述第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述p为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
具体的，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
具体的，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述基站归属的通信系统中在所述第n个下行子帧或所述第n个子帧内的 DwPTS内存在一个或两个候选NB-PDCCH。
具体的，若所述NB-PDCCH为第二格式的NB-PDCCH，则所述基站归属的通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个候选NB-PDCCH。
进一步地，如图22所示，所述基站1还包括处理单元11。
所述处理单元11，用于若所述NB-PDCCH为第一格式的NB-PDCCH，则将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
其中，所述第一资源单元组包含所述第一NB-CCE的所有RE，所述第二资源单元组包含所述第二NB-CCE的所有RE；
或者，
所述第一资源单元组包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二资源单元组包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
进一步地，所述处理单元11，还用于在将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中之前，对第一待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，所述第一待传输的比特块为所述第一格式的NB-PDCCH中待传输的比特块，以及对所述第一向量块进行序列变化，以生成待传输的第一符号序列。
进一步地，所述处理单元11，具体用于将所述待传输的第一符号序列映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中。
进一步地，所述处理单元11，用于若所述NB-PDCCH为第二格式的NB-PDCCH，则将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
进一步地，所述处理单元11，具体用于将所述第二格式的NB-PDCCH依次映射在所述第一NB-CCE的可用RE中和第二NB-CCE的可用RE中；或者，将所述第二格式的NB-PDCCH依次在所述第n个下行子帧或第n个子帧内的DwPTS内的每个符号的可用RE中映射。
进一步地，所述处理单元11，还用于在将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中之前，对第二待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第二向量块，所述第二待传输的比特块为所述第二格式的NB-PDCCH中待传输的比特块，以及用于对所述第二向量块进行序列变化，以生成待传输的第二符号序列。
进一步地，所述处理单元11，具体用于将所述待传输的第二符号序列映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中。
进一步地，所述发送单元10，还用于若在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDCCH。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
进一步地，所述发送单元10，还用于在预设的聚合窗口中发送所述NB-PDCCH。
所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述发送单元10，还用于在预设的聚合窗口中发送所述NB-PDCCH之前，向所述用户终端发送第一配置信息。
所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述发送单元10，还用于在预设的聚合窗口中发送所述NB-PDCCH之前，向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
进一步地，所述发送单元10，用于在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行共享信道NB-PDSCH，以及用于在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDSCH。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包 含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
进一步地，所述发送单元10，还用于在预设的聚合窗口中发送所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个资源单元RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述发送单元10，还用于在预设的聚合窗口中发送所述NB-PDSCH之前，向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述发送单元10，还用于在预设的聚合窗口中发送所述NB-PDSCH之前，向所述用户终端发送第二配置信息。
所述第二配置信息指示所述用户终端在所述预设的聚合窗口内 接收或监测所述NB-PDSCH。
可以理解的是，本实施例的基站1仅为根据该基站1实现的功能进行的逻辑划分，实际应用中，可以进行上述单元的叠加或拆分。并且该实施例提供的基站1所实现的功能与上述实施例一提供的物理下行信道的传输方法和上述实施例二提供的物理下行信道的传输方法对应，对于该基站1所实现的更为详细的处理流程，在上述方法实施例一和实施例二中已做详细描述，此处不再详细描述。
本发明另一实施例提供一种基站，如图23所示，该基站包括接口电路20、处理器21、存储器22和系统总线23。
其中，所述接口电路20、所述处理器21与所述存储器22之间通过所述系统总线23连接，并完成相互间通信。
本领域技术人员可以理解，图23所示的基站的结构并不是对基站的限定，其可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
具体的，当所述基站运行时，所述基站执行实施例一或实施例二所描述的物理下行信道的传输方法。具体的物理下行信道的传输方法可参见上述如图5或图20所示的实施例中的相关描述，此处不再赘述。
具体的，接口电路20用于实现该基站与用户终端之间的通信连接。
具体的，所述存储器22可用于存储软件程序以及应用模块，处理器21通过运行存储在存储器22的软件程序以及应用模块，从而执行基站的各种功能应用以及数据处理。存储器22可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如发送子帧)等。
其中，所述存储器22可以包括易失性存储器，例如高速随机存取存储器(RAM，Random Access Memory)，所述存储器22也可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其 他易失性固态存储器件。
具体的，所述处理器21是基站的控制中心，利用各种接口和线路连接整个基站的各个部分，通过运行或执行存储在存储器22内的软件程序和/或应用模块，以及调用存储在存储器22内的数据，执行基站的各种功能和处理数据，从而对基站进行整体监控。
其中，处理器21可以为中央处理器(CPU，Central Processing Unit)。所述处理器21还可以为其他通用处理器、数字信号处理器(DSP，Digital Signal Processing)或者其他可编程逻辑器件或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
所述系统总线23可以包括数据总线、电源总线、控制总线和信号状态总线等。本实施例中为了清楚说明，在图23中将各种总线都示意为系统总线23。
本发明实施例提供一种基站，基站在第n个下行子帧或第n个子帧内的DwPTS向终端发送NB-PDCCH，其中，NB-PDCCH映射频率资源的带宽小于或等于180kHz的NB-PDCCH映射基本单元上，实现了在NBIOT系统中传输PDCCH。
实施例四
本发明实施例提供一种用户终端1，所述用户终端1用于执行以上方法中的用户终端所执行的步骤。所述用户终端1可以包括相应步骤所对应的模块。如图24所示，该用户终端1包括：
接收单元30，用于接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行控制信道NB-PDCCH。
其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源 块RB包含的频率资源，n≥1。
具体的，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1。
具体的，所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中接收；
或者，
所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中接收。
具体的，所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
具体的，若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
或者，
所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述P为所述基站通过所述NB-PBCH或者 系统信息承载的数值，4≥p≥0。
具体的，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
进一步地，如图25所示，所述用户终端1还包括处理单元31。
所述处理单元31，用于若所述NB-PDCCH为第一格式的NB-PDCCH，则在所述第n个下行子帧或第n个子帧内的DwPTS内监测第一候选NB-PDCCH和/或第二候选NB-PDCCH，所述第一候选NB-PDCCH或所述第二候选NB-PDCCH包含m个RE。
具体的，所述第一格式的NB-PDCCH映射在所述第一候选NB-PDCCH的可用RE或所述第二候选NB-PDCCH的可用RE中，所述可用RE为不包含参考信号的RE。
其中，所述第一候选NB-PDCCH包含所述第一NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第二NB-CCE的所有RE；
或者，
所述第一候选NB-PDCCH包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
所述处理单元31，用于若所述NB-PDCCH为第二格式的NB-PDCCH，则将所述第二格式的NB-PDCCH映射在第一NB-CCE的可用RE和第二NB-CCE的可用RE中，所述可用RE为不包含参考信号的RE。
进一步地，所述接收单元30，还用于接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDCCH；所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧。
其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个 包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
进一步地，所述接收单元30，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH。
所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述接收单元30，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH之前，接收所述基站发送的第一配置信息。
所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述接收单元30，还用于在预设的聚合窗口内接收 或监测所述NB-PDCCH之前，接收所述基站发送的第二配置信息。
所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
进一步地，接收单元30，用于接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行共享信道NB-PDSCH和接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDSCH。
所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧；所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧；其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
具体的，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
进一步地，所述接收单元30，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH。
其中，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续 OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
进一步地，所述接收单元30，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
进一步地，所述接收单元30，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
本发明另一实施例提供一种用户终端，如图26所示，该用户终端包括接口电路40、处理器41、存储器42和系统总线43。
其中，所述接口电路40、所述处理器41与所述存储器42之间通过所述系统总线43连接，并完成相互间通信。
本领域技术人员可以理解，图26所示的用户终端的结构并不是对用户终端的限定，其可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
具体的，当所述用户终端运行时，所述用户终端执行实施例一或实施例二所描述的物理下行信道的传输方法。具体的物理下行信道的传输方法可参见上述如图5或图20所示的实施例中的相关描述，此处不再赘述。
具体的，接口电路40用于实现该用户终端与基站之间的通信连接。
具体的，所述存储器42可用于存储软件程序以及应用模块，处理器41通过运行存储在存储器42的软件程序以及应用模块，从而 执行用户终端的各种功能应用以及数据处理。存储器42可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如发送行驶路径请求功能)等；存储数据区可存储地图。
其中，所述存储器42可以包括易失性存储器，例如高速随机存取存储器(RAM，Random Access Memory)，所述存储器42也可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
具体的，所述处理器41是用户终端的控制中心，利用各种接口和线路连接整个用户终端的各个部分，通过运行或执行存储在存储器42内的软件程序和/或应用模块，以及调用存储在存储器42内的数据，执行用户终端的各种功能和处理数据，从而对用户终端进行整体监控。
其中，处理器41可以为中央处理器(CPU，Central Processing Unit)。所述处理器41还可以为其他通用处理器、数字信号处理器(DSP，Digital Signal Processing)或者其他可编程逻辑器件或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
所述系统总线43可以包括数据总线、电源总线、控制总线和信号状态总线等。本实施例中为了清楚说明，在图26中将各种总线都示意为系统总线43。
本发明实施例提供一种用户终端，用户终端在第n个下行子帧或第n个子帧内的DwPTS接收基站发送的NB-PDCCH，其中，NB-PDCCH映射频率资源的带宽小于或等于180kHz的NB-PDCCH映射基本单元上，实现了在NBIOT系统中传输PDCCH。
实施例五
本发明实施例提供一种通信系统，如图27所示，该通信系统包括如上述第三实施例所述的基站以及如上述第四实施例所述的用户终端，所述基站与所述用户终端之间通过网络连接。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将移动设备的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的系统，移动设备和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，移动设备和方法，可以通过其它的方式实现。例如，以上所描述的移动设备实施例仅仅是示意性的，例如，所述模块或单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，移动设备或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设 备等)或处理器(processor)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (85)

  1. 一种物理下行信道的发送方法，其特征在于，应用于通信系统，包括：
    基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行控制信道NB-PDCCH；
    其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
  2. 根据权利要求1所述的发送方法，其特征在于，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1；
    所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中发送；
    或者，
    所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中发送。
  3. 根据权利要求2所述的发送方法，其特征在于，
    所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或所述第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
  4. 根据权利要求3所述的发送方法，其特征在于，
    若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到 大的顺序排列后的前3个或者前5个连续OFDM符号；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述p为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
  5. 根据权利要求2-4中任意一项所述的发送方法，其特征在于，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
  6. 根据权利要求2-5中任意一项所述的发送方法，其特征在于，
    若所述NB-PDCCH为第一格式的NB-PDCCH，则所述通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个或两个候选NB-PDCCH；
    若所述NB-PDCCH为第二格式的NB-PDCCH，则所述通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个候选NB-PDCCH。
  7. 根据权利要求2-6中任意一项所述的发送方法，其特征在于，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述基站将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE；
    其中，所述第一资源单元组包含所述第一NB-CCE的所有RE，所述第二资源单元组包含所述第二NB-CCE的所有RE；
    或者，
    所述第一资源单元组包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二资源单元组包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
  8. 根据权利要求7所述的发送方法，其特征在于，所述基站将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中之前，所述发送方法还包括：
    所述基站对第一待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，所述第一待传输的比特块为所述第一格式的NB-PDCCH中待传输的比特块；
    所述基站对所述第一向量块进行序列变化，以生成待传输的第一符号序列。
  9. 根据权利要求8所述的发送方法，其特征在于，所述基站在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中向所述用户终端发送所述第一格式的NB-PDCCH，具体包括：
    所述基站将所述待传输的第一符号序列映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中。
  10. 根据权利要求2-6中任意一项所述的发送方法，其特征在于，若所述NB-PDCCH为第二格式的NB-PDCCH，则所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
  11. 根据权利要求10所述的发送方法，其特征在于，所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，包括：
    所述基站将所述第二格式的NB-PDCCH依次映射在所述第一NB-CCE的可用RE中和第二NB-CCE的可用RE中；
    或者，
    所述基站将所述第二格式的NB-PDCCH依次在所述第n个下行子 帧或第n个子帧内的DwPTS内的每个符号的可用RE中映射。
  12. 根据权利要求11所述的发送方法，其特征在于，所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中之前，所述发送方法还包括：
    所述基站对第二待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第二向量块，所述第二待传输的比特块为所述第二格式的NB-PDCCH中待传输的比特块；
    所述基站对所述第二向量块进行序列变化，以生成待传输的第二符号序列。
  13. 根据权利要求12所述的发送方法，其特征在于，所述基站将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，具体包括：
    所述基站将所述待传输的第二符号序列映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中。
  14. 根据权利要求1-13中任意一项所述的发送方法，其特征在于，所述发送方法还包括：
    若所述基站在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则所述基站在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDCCH；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  15. 根据权利要求14所述的发送方法，其特征在于，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送 所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
  16. 根据权利要求1-13中任意一项所述的发送方法，其特征在于，所述发送方法还包括：
    所述基站在预设的聚合窗口中发送所述NB-PDCCH，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  17. 根据权利要求16所述的方法，其特征在于，所述基站在预设的聚合窗口中发送所述NB-PDCCH之前，所述发送方法还包括：
    所述基站向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  18. 根据权利要求17所述的发送方法，其特征在于，所述基站在预设的聚合窗口中发送所述NB-PDCCH之前，所述发送方法还包括：
    所述基站向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
  19. 一种物理下行信道的发送方法，其特征在于，包括：
    基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行共享信道NB-PDSCH；
    所述基站在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则所述基站在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDSCH；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  20. 根据权利要求19所述的发送方法，其特征在于，
    对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
  21. 根据权利要求19或20所述的发送方法，其特征在于，所述发送方法还包括：
    所述基站在预设的聚合窗口中发送所述NB-PDSCH；
    其中，所述预设的聚合窗口由c*y个资源单元RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  22. 根据权利要求21所述的发送方法，其特征在于，所述基站 在预设的聚合窗口中发送所述NB-PDSCH之前，所述发送方法还包括：
    所述基站向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  23. 根据权利要求22所述的发送方法，其特征在于，所述基站在预设的聚合窗口中发送所述NB-PDSCH之前，所述发送方法还包括：
    所述基站向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
  24. 一种物理下行信道的接收方法，其特征在于，包括：
    用户终端接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行控制信道NB-PDCCH；
    其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
  25. 根据权利要求24所述的接收方法，其特征在于，所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1；
    所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中接收；
    或者，
    所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中接收。
  26. 根据权利要求25所述的接收方法，其特征在于，
    所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
  27. 根据权利要求26所述的接收方法，其特征在于，
    若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述P为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
  28. 根据权利要求25-27中任意一项所述的接收方法，其特征在于，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
  29. 根据权利要求25-28中任意一项所述的接收方法，其特征在于，若所述NB-PDCCH为第一格式的NB-PDCCH，则所述用户终端在所述第n个下行子帧或第n个子帧内的DwPTS内监测第一候选NB-PDCCH和/或第二候选NB-PDCCH，所述第一候选NB-PDCCH或所述第二候选 NB-PDCCH包含m个RE。
  30. 根据权利要求29所述的接收方法，其特征在于，所述第一格式的NB-PDCCH映射在所述第一候选NB-PDCCH的可用RE或所述第二候选NB-PDCCH的可用RE中，所述可用RE为不包含参考信号的RE；
    其中，所述第一候选NB-PDCCH包含所述第一NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第二NB-CCE的所有RE；
    或者，
    所述第一候选NB-PDCCH包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
  31. 根据权利要求25-28中任意一项所述的接收方法，其特征在于，若所述NB-PDCCH为第二格式的NB-PDCCH，则所述第二格式的NB-PDCCH映射在第一NB-CCE的可用RE和第二NB-CCE的可用RE中，所述可用RE为不包含参考信号的RE。
  32. 根据权利要求24-31中任意一项所述的接收方法，其特征在于，所述接收方法还包括：
    所述用户终端接收所述基站在所述第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDCCH，所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  33. 根据权利要求32所述的接收方法，其特征在于，对于所述 空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
  34. 根据权利要求24-31中任意一项所述的接收方法，其特征在于，所述接收方法还包括：
    所述用户终端在预设的聚合窗口内接收或监测所述NB-PDCCH，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  35. 根据权利要求34所述的接收方法，其特征在于，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDCCH之前，所述接收方法还包括：
    所述用户终端接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  36. 根据权利要求35所述的接收方法，其特征在于，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDCCH之前，所述接收方法还包括：
    所述用户终端接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
  37. 一种物理下行信道的接收方法，其特征在于，包括：
    用户终端接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行共享信道NB-PDSCH；
    所述用户终端接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDSCH，所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  38. 根据权利要求37所述的接收方法，其特征在于，对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
  39. 根据权利要求37或38所述的接收方法，其特征在于，所述接收方法还包括：
    所述用户终端在预设的聚合窗口内接收或监测所述NB-PDSCH；
    其中，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  40. 根据权利要求39所述的接收方法，其特征在于，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDSCH之前，所述接收方法还包括：
    所述用户终端接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  41. 根据权利要求40所述的接收方法，其特征在于，所述用户终端在预设的聚合窗口内接收或监测所述NB-PDSCH之前，所述接收方法还包括：
    所述用户终端接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
  42. 一种基站，其特征在于，包括：
    发送单元，用于在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行控制信道NB-PDCCH；
    其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
  43. 根据权利要求42所述的基站，其特征在于，
    所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1；
    所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中发送；
    或者，
    所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中发送。
  44. 根据权利要求43所述的基站，其特征在于，
    所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或所述第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
  45. 根据权利要求44所述的基站，其特征在于，
    若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述p为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
  46. 根据权利要求43-45中任意一项所述的基站，其特征在于，对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
  47. 根据权利要求43-46中任意一项所述的基站，其特征在于，
    若所述NB-PDCCH为第一格式的NB-PDCCH，则所述基站归属的通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个或两个候选NB-PDCCH；
    若所述NB-PDCCH为第二格式的NB-PDCCH，则所述基站归属的通信系统中在所述第n个下行子帧或所述第n个子帧内的DwPTS内存在一个候选NB-PDCCH。
  48. 根据权利要求43-47中任意一项所述的基站，其特征在于，所述基站还包括处理单元；
    所述处理单元，用于若所述NB-PDCCH为第一格式的NB-PDCCH，则将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE；
    其中，所述第一资源单元组包含所述第一NB-CCE的所有RE，所述第二资源单元组包含所述第二NB-CCE的所有RE；
    或者，
    所述第一资源单元组包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二资源单元组包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
  49. 根据权利要求48所述的基站，其特征在于，
    所述处理单元，还用于在将所述第一格式的NB-PDCCH映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中之前，对第一待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第一向量块，所述第一待传输的比特块为所述第一格式的NB-PDCCH中待传输的比特块，以及对所述第一向量块进行序列变化，以生成待传输的第一符号序列。
  50. 根据权利要求49所述的基站，其特征在于，
    所述处理单元，具体用于将所述待传输的第一符号序列映射在第一资源单元组的可用RE中或在第二资源单元组中的可用RE中。
  51. 根据权利要求43-47中任意一项所述的基站，其特征在于，所述基站还包括处理单元；
    所述处理单元，用于若所述NB-PDCCH为第二格式的NB-PDCCH，则将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中，所述可用RE为不包含参考信号的RE。
  52. 根据权利要求51所述的基站，其特征在于，
    所述处理单元，具体用于将所述第二格式的NB-PDCCH依次映射在所述第一NB-CCE的可用RE中和第二NB-CCE的可用RE中；
    或者，
    将所述第二格式的NB-PDCCH依次在所述第n个下行子帧或第n个子帧内的DwPTS内的每个符号的可用RE中映射。
  53. 根据权利要求52所述的基站，其特征在于，
    所述处理单元，还用于在将所述第二格式的NB-PDCCH映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中之前，对第二待传输的比特块进行加扰、调制、层映射和预编码处理，以生成第二向量块，所述第二待传输的比特块为所述第二格式的NB-PDCCH中待传输的比特块，以及用于对所述第二向量块进行序列变化，以生成待传输的第二符号序列。
  54. 根据权利要求53所述的基站，其特征在于，
    所述处理单元，具体用于将所述待传输的第二符号序列映射在第一资源单元组的可用RE中和在第二资源单元组中的可用RE中。
  55. 根据权利要求42-54中任意一项所述的基站，其特征在于，
    所述发送单元，还用于若在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDCCH；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含 DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  56. 根据权利要求55所述的基站，其特征在于，
    对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
  57. 根据权利要求42-54中任意一项所述的基站，其特征在于，
    所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDCCH，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  58. 根据权利要求57所述的基站，其特征在于，
    所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDCCH之前，向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  59. 根据权利要求58所述的基站，其特征在于，
    所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDCCH 之前，向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
  60. 一种基站，其特征在于，包括：
    发送单元，用于在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS向用户终端发送窄带物理下行共享信道NB-PDSCH，以及用于在第n+a或n-a个下行子帧发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，则在所述第n+a个或n-a个下行子帧的空白符号发送所述NB-PDSCH；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  61. 根据权利要求60所述的基站，其特征在于，
    对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复发送所述第n个下行子帧或所述第n个包含DwPTS的子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
  62. 根据权利要求60或61所述的基站，其特征在于，
    所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDSCH；
    其中，所述预设的聚合窗口由c*y个资源单元RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM 符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述基站在所述公用下行子帧内发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  63. 根据权利要求62所述的基站，其特征在于，
    所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDSCH之前，向所述用户终端发送第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  64. 根据权利要求63所述的基站，其特征在于，
    所述发送单元，还用于在预设的聚合窗口中发送所述NB-PDSCH之前，向所述用户终端发送第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
  65. 一种用户终端，其特征在于，包括：
    接收单元，用于接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行控制信道NB-PDCCH；
    其中，所述NB-PDCCH映射在NB-PDCCH映射基本单元上，所述NB-PDCCH映射基本单元在频率域上包括第一频率资源或第二频率资源，在时间域上包括第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS所包含的至少一个正交频分复用OFDM符号，所述第一频率资源的带宽小于或等于180kHz，所述第二频率资源为1个资源块RB包含的频率资源，n≥1。
  66. 根据权利要求65所述的用户终端，其特征在于，
    所述NB-PDCCH映射基本单元由第一窄带控制信道单元NB-CCE和/或第二NB-CCE组成，所述第一NB-CCE或第二NB-CCE包含m个资源单元RE，m>1；
    所述NB-PDCCH为第一格式的NB-PDCCH，其中，所述第一格式的NB-PDCCH在m个RE中接收；
    或者，
    所述NB-PDCCH为第二格式的NB-PDCCH，其中，所述第二格式的NB-PDCCH在2*m个RE中接收。
  67. 根据权利要求66所述的用户终端，其特征在于，
    所述m个RE由x*y个RE组成，其中，x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的连续正交频分复用OFDM符号的数量，y代表所述第n个下行子帧或第n个子帧内的DwPTS内每个OFDM符号在频率域对应的子载波的数量，x>1，12≥y≥1。
  68. 根据权利要求67所述的用户终端，其特征在于，
    若所述第n个下行子帧或者包含DwPTS的第n个子帧为用于发送窄带物理广播信道NB-PBCH，窄带主同步信号NB-PSS，或窄带辅同步信号NB-SSS的子帧，则x个OFDM符号为时间域中所述第n个下行子帧或所述第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后的前3个或者前5个连续OFDM符号；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量；
    或者，
    所述x代表时间域中所述第n个下行子帧或第n个子帧内的DwPTS内的所有OFDM符号按照时间从小到大的顺序排列后，第p+1个OFDM符号起直到最后一个OFDM符号的连续OFDM符号的数量,所述p为预设的数值，或者所述P为所述基站通过所述NB-PBCH或者系统信息承载的数值，4≥p≥0。
  69. 根据权利要求66-68中任意一项所述的用户终端，其特征在于，
    对于所述第一NB-CCE或所述第二NB-CCE，在所述m个RE中的每个OFDM符号上包含连续的6个子载波，且所述第一NB-CCE或第二NB-CCE在每个OFDM符号中包含的6个子载波的索引相同或者按照第一预设规则变化。
  70. 根据权利要求66-69中任意一项所述的用户终端，其特征在于，所述用户终端还包括处理单元；
    所述处理单元，用于若所述NB-PDCCH为第一格式的NB-PDCCH，则在所述第n个下行子帧或第n个子帧内的DwPTS内监测第一候选NB-PDCCH和/或第二候选NB-PDCCH，所述第一候选NB-PDCCH或所述第二候选NB-PDCCH包含m个RE。
  71. 根据权利要求70所述的用户终端，其特征在于，
    所述第一格式的NB-PDCCH映射在所述第一候选NB-PDCCH的可用RE或所述第二候选NB-PDCCH的可用RE中，所述可用RE为不包含参考信号的RE；
    其中，所述第一候选NB-PDCCH包含所述第一NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第二NB-CCE的所有RE；
    或者，
    所述第一候选NB-PDCCH包含所述第n个下行子帧中第一个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE，所述第二候选NB-PDCCH包含所述第n个下行子帧中第二个时隙的所述第一NB-CCE的所有RE和所述第二NB-CCE的所有RE。
  72. 根据权利要求66-68中任意一项所述的用户终端，其特征在于，所述用户终端还包括处理单元；
    所述处理单元，用于若所述NB-PDCCH为第二格式的NB-PDCCH，则将所述第二格式的NB-PDCCH映射在第一NB-CCE的可用RE和第二NB-CCE的可用RE中，所述可用RE为不包含参考信号的RE。
  73. 根据权利要求65-72中任意一项所述的用户终端，其特征在于，
    所述接收单元，还用于接收所述基站在所述第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDCCH，所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包 含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  74. 根据权利要求73所述的用户终端，其特征在于，
    对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDCCH，i≤5。
  75. 根据权利要求65-72中任意一项所述的用户终端，其特征在于，
    所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  76. 根据权利要求75所述的用户终端，其特征在于，
    所述接收单元，还用于在在预设的聚合窗口内接收或监测所述NB-PDCCH之前，接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  77. 根据权利要求76所述的用户终端，其特征在于，
    所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDCCH之前，接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDCCH。
  78. 一种用户终端，其特征在于，包括：
    接收单元，用于接收基站在第n个下行子帧或第n个子帧内的下行链路导频时隙DwPTS内发送的窄带物理下行共享信道NB-PDSCH和接收所述基站在第n+a个或n-a个下行子帧的空白符号上发送的所述NB-PDSCH，所述第n+a或n-a个下行子帧是发送窄带物理广播信道NB-PBCH或窄带同步信号NB-SS的子帧；
    其中，所述第n+a个下行子帧为所述第n个下行子帧或第n个包含DwPTS的子帧之后的第一个下行子帧或第一个包含DwPTS的子帧，所述第n-a个下行子帧为所述第n个下行子帧或所述第n个包含DwPTS的子帧之前的第一个下行子帧或第一个包含DwPTS的子帧，所述空白符号是指发送所述NB-PBCH或所述NB-SS的下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，a>0,b等于3或5，所述NB-SS包括窄带主同步信号NB-PSS或窄带辅同步信号NB-SSS。
  79. 根据权利要求78所述的用户终端，其特征在于，
    对于所述空白符号中的第i个OFDM符号，在所述第i个OFDM符号上重复接收所述第n个子帧内的所有OFDM符号按照时间从小到大的顺序排列后的第i个OFDM符号上映射的NB-PDSCH，i≤5。
  80. 根据权利要求78或79所述的用户终端，其特征在于，
    所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH；
    其中，所述预设的聚合窗口由c*y个RE组成，且c＝b*z，所述c代表时间域所述预设的聚合窗口包含的正交频分复用OFDM符号数量，z为所述预设的聚合窗口包含的公用下行子帧的数量，y代表所 述预设的聚合窗口内每个OFDM符号在频率域对应的子载波的数量，b代表时间域中z个公用下行子帧中每个公用下行子帧内的连续OFDM符号的数量，且b个OFDM符号为该公用下行子帧内的所有OFDM符号按照时间从小到大的顺序排列后的前b个连续OFDM符号，所述用户终端在所述公用下行子帧内接收窄带物理广播信道NB-PBCH或窄带同步信号NB-SS，c≥3，z≥1，12≥y≥1，b等于3或5。
  81. 根据权利要求80所述的用户终端，其特征在于，
    所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第一配置信息，所述第一配置信息包括所述聚合窗口的位置信息，所述聚合窗口的位置信息至少包括所述预设的聚合窗口的时间起点位置和所述预设的聚合窗口的长度，或者，所述预设的聚合窗口的周期和时间偏移量。
  82. 根据权利要求81所述的用户终端，其特征在于，
    所述接收单元，还用于在预设的聚合窗口内接收或监测所述NB-PDSCH之前，接收所述基站发送的第二配置信息，所述第二配置信息指示所述用户终端在所述预设的聚合窗口内接收或监测所述NB-PDSCH。
  83. 一种基站，其特征在于，包括接口电路、处理器、存储器和系统总线；
    所述接口电路、所述处理器、所述存储器与所述系统总线连接，当所述基站运行时，所述基站执行如权利要求1-18中任意一项所述的物理下行信道的发送方法或者执行如权利要求19-23中任意一项所述的物理下行信道的发送方法。
  84. 一种用户终端，其特征在于，包括接口电路、处理器、存储器和系统总线；
    所述接口电路、所述处理器、所述存储器与所述系统总线连接，当所述用户终端运行时，所述用户终端执行如权利要求24-36中任意一项所述的物理下行信道的接收方法或者执行如权利要求37-41中任意一项所述的物理下行信道的接收方法。
  85. 一种通信系统，其特征在于，包括如权利要求83所述的基站以及如权利要求84所述的用户终端，所述基站与所述用户终端之间通过网络连接。
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