WO2017133676A1 - Procédé et dispositif pour émettre et recevoir un signal de référence, et système d'émission - Google Patents

Procédé et dispositif pour émettre et recevoir un signal de référence, et système d'émission Download PDF

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Publication number
WO2017133676A1
WO2017133676A1 PCT/CN2017/072858 CN2017072858W WO2017133676A1 WO 2017133676 A1 WO2017133676 A1 WO 2017133676A1 CN 2017072858 W CN2017072858 W CN 2017072858W WO 2017133676 A1 WO2017133676 A1 WO 2017133676A1
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Prior art keywords
subframe
reference signal
subframes
lte
narrowband
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PCT/CN2017/072858
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English (en)
Chinese (zh)
Inventor
陈宪明
戴博
张雯
方惠英
夏树强
鲁照华
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中兴通讯股份有限公司
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Publication of WO2017133676A1 publication Critical patent/WO2017133676A1/fr

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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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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

Definitions

  • the present invention relates to the field of communications, and in particular to a method and device for transmitting and receiving a reference signal and a transmission system.
  • NB-IoT NarrowBand-Cellular Internet of Things
  • 3rd Generation Partnership Project 3rd Generation Partnership Project for short
  • the NB-IoT system focuses on low-complexity and low-throughput radio access technologies, and the main research objectives include: improved indoor coverage, support of a large amount of low-throughput user equipment, and low delay sensitivity. Ultra low equipment cost, low equipment power loss and network architecture.
  • the uplink and downlink transmission bandwidths of the NB-IoT system are all 180 kHz, which is the same as the bandwidth of a Physical Resource Block (PRB) of the Long Term Evolution (LTE) system, which is beneficial to the NB-
  • PRB Physical Resource Block
  • LTE Long Term Evolution
  • the design of the existing LTE system is reused in the IoT system.
  • the NB-IoT system also supports three different modes of operation: 1) Stand-alone operation, for example, using the current GSM EDGE Radio Access Network (GERAN) system.
  • the used spectrum replaces one or more Global System for Mobile Communication (GSM) carriers; 2) Guard band operation, for example, utilized within an LTE carrier protection band Resource blocks; 3) In-band operations, such as utilizing resource blocks within a normal LTE carrier range.
  • GSM Global System for Mobile Communication
  • Guard band operation for example, utilized within an LTE carrier protection band Resource blocks
  • In-band operations such as utilizing resource blocks within a normal LTE carrier range.
  • NB-IoT reference signal Narrow-Band-Reference Signal
  • NB-RS Narrow-Band-Reference Signal
  • the NB-IoT system can simultaneously use multiple narrowbands of 180 kHz, one of which is used as an anchor narrowband, at least for transmitting primary synchronization signals/secondary synchronization.
  • the signal ArrowBand-Primary Synchronization Signal/Secondary synchronization Signal, NB-PSS/SSS for short
  • NB-PBCH NarrowBand-Physical Broadcast Channel
  • the present invention provides a method and a device for transmitting and receiving a reference signal, and a transmission system, to at least solve the problem of how to transmit an NB-RS in a case where a plurality of narrowbands are simultaneously used in an NB-IoT system in the related art.
  • a method for transmitting a reference signal includes: transmitting, for one narrowband of all narrowbands used by the system, a reference signal in one of the following manners: transmitting a reference signal on all valid subframes a reference signal is transmitted on the non-multicast broadcast single frequency network MBSFN subframe and the MBSFN subframe in which the data transmission exists in all valid subframes; the reference signal is transmitted on the subframe in which the data transmission exists in all valid subframes; The reference signal is transmitted on a predefined subframe in all valid subframes and a non-predefined subframe in which there is data transmission; wherein the valid subframe is a subframe having the capability of transmitting system data.
  • one of the narrowbands is a narrowband or a non-primary narrowband; wherein the primary narrowband is a narrowband for transmitting the primary synchronization signal PSS and the secondary synchronization signal SSS and the physical broadcast channel PBCH data.
  • the predefined subframe in a case where the system is a Frequency Division Duplex (FDD) system, the predefined subframe includes at least one of the following subframes: subframes numbered 0, 4, 5, and 9. In the case where the system is a time division duplex TDD system, the predefined subframe includes at least one of the following subframes: subframes numbered 0, 1, 5, and 6.
  • FDD Frequency Division Duplex
  • the data includes at least one of the following: data carried on the physical broadcast channel PBCH, data carried on the physical downlink control channel PDCCH, and data carried on the physical downlink shared channel PDSCH.
  • the reference signal is a single port reference signal or a two port reference signal.
  • the reference signal is transmitted in the same manner for the primary narrowband and the non-primary narrowband.
  • the reference signal is transmitted in different manners for the primary narrowband and the non-primary narrowband, wherein the primary narrowband is transmitted according to the manner in which the reference signal is transmitted on all valid subframes, or according to the non-effectiveness in all valid subframes.
  • the non-primary narrowband transmits the reference signal in one of the following manners: the reference is transmitted on the subframe in which the data transmission exists in all the valid subframes.
  • the primary narrowband transmits a reference signal on a predefined subframe in all valid subframes and a subframe in which data transmission exists
  • the non-primary narrowband transmits the reference signal in such a manner that the reference signal is transmitted on the subframe in which the data transmission exists in all valid subframes.
  • the long-term evolution LTE cell-specific reference signal CRS information is indicated by at least one of the following signaling: the primary information block MIB signaling carried in the PBCH.
  • the sequence information includes at least one of the following: an index of a first element of the LTE CRS sequence used by the primary narrowband in the maximum length LTE CRS sequence, and a position of the non-primary narrowband within the bandwidth of the LTE system relative to the primary narrowband. Position offset within the bandwidth of the LTE system, LTE system bandwidth, index of the PRB occupied by the primary narrowband within the bandwidth of the LTE system, and index of the PRB occupied by the non-primary narrowband within the bandwidth of the LTE system; wherein the maximum length LTE CRS sequence is the largest LTE CRS sequence used by LTE system bandwidth.
  • the same reference signal sequence is used for consecutive L subframes or valid subframes, where L is an integer greater than one.
  • the same number of valid subframes in different narrowbands use the same or different reference signal sequences; wherein the same number of valid subframes in different narrowbands are used.
  • Different ginseng The test signal sequence includes: the reference signal sequence used by the valid subframe in one narrowband is equal to the LTE CRS sequence corresponding to the valid subframe.
  • the effective subframe when the operating mode of the system is guard band Guard band operation or independent Stand-alone operation, includes subframes in which all primary subframes do not have primary synchronization signal PSS and/or secondary synchronization signal SSS transmission. .
  • a method for receiving a reference signal includes: receiving a reference signal on a first time-frequency resource in the case of receiving data, or receiving a reference signal on a first time-frequency resource and Long-term evolution of the LTE cell-specific reference signal CRS; wherein the first time-frequency resource is a time-frequency resource occupied by the received data; and in the case of performing channel measurement or radio resource management RRM measurement, receiving the following on the second time-frequency resource At least one of: a reference signal, an LTE CRS; wherein the second time-frequency resource is one of: M subframes located in a primary narrowband or a non-primary narrowband, and M subframes located in X different narrowbands; wherein An integer greater than 0, X is an integer greater than one.
  • the main narrow band is the main narrow band in all the narrow bands used by the system
  • the non-main narrow band is one non-main narrow band in all the narrow bands used by the system
  • the X different narrow bands are the X different in all the narrow bands used by the system.
  • the primary narrowband is a narrowband for transmitting the primary synchronization signal PSS and the secondary synchronization signal SSS and the physical broadcast channel PBCH data.
  • the M subframes include one of the following: consecutive M valid subframes; consecutive M non-MBSFN subframes in all valid subframes; and consecutive M consecutive public data transmission subframes in all valid subframes a frame; consecutive M predefined subframes in all valid subframes; consecutive M designated subframes in all valid subframes; wherein the designated subframe includes one of the following: a non-multicast broadcast single frequency network MBSFN subframe and There are MBSFN subframes for public data transmission; predefined subframes and non-predefined subframes with public data transmission; non-MBSFN subframes, MBSFN subframes for unicast data transmission to the terminal device, and public data transmission MBSFN subframe; a predefined subframe, a non-predefined subframe in which unicast data transmission is sent to the terminal device, and a non-predefined subframe in which public data transmission exists; wherein the valid subframe is a sub-capacity capable of transmitting system data frame.
  • the signal received on the first time-frequency resource is determined according to at least one of the following information: an operation mode, a coverage level, and a data type; and the second time-frequency resource is determined according to at least one of the following information: Received signals: operation mode, narrowband type; wherein the above operation modes include in-band In-band operation, guard band Guard band operation, and independent Stand-alone operation; the above narrowband types include primary narrowband and non-master narrowband; The data received before acquiring the LTE CRS information and the data received after acquiring the LTE CRS information.
  • the operating mode of the system is In-band operation, receiving signaling for indicating LTE CRS information, where the signaling includes at least one of: primary information block MIB signaling carried in the PBCH
  • the LTE CRS information includes at least one of the following: port number information, sequence information, precoding matrix information, and power information.
  • the sequence information includes at least one of the following: an index of a first element of the LTE CRS sequence used by the primary narrowband in the maximum length LTE CRS sequence, and a position of the non-primary narrowband within the bandwidth of the LTE system relative to the primary narrowband. Position offset within the bandwidth of the LTE system, LTE system bandwidth, index of the PRB occupied by the primary narrowband within the bandwidth of the LTE system, and index of the PRB occupied by the non-primary narrowband within the bandwidth of the LTE system; wherein the maximum length LTE CRS sequence is the largest LTE CRS sequence used by LTE system bandwidth.
  • receiving the LTE CRS on the first time-frequency resource includes: when the port number K 1 of the reference signal is less than or equal to the port number K 2 of the LTE CRS, receiving the LTE CRS according to one of the following manners: the receiving number is LTE CRS of K 1 ports of 0 to K 1 -1; LTE CRS of K 2 ports numbered 0 to K 2 -1; wherein K 1 , K 2 are positive integers.
  • the LTE CRS is received on the second time-frequency resource according to one of the following manners: receiving the LTE CRS signal of one port with the number 0; receiving the K 2 ports of the number 0 to K 2 -1 LTE CRS; where K 2 is the number of ports of the LTE CRS, and K 2 is a positive integer.
  • the predefined subframe in a case where the system is a frequency division duplex FDD system, the predefined subframe includes at least one of the following subframes: numbers 0, 4, 5, and 9; and the system is time division duplex In the case of a (Time Division Duplex, TDD for short) system, the predefined subframe includes at least one of the following subframes: numbers 0, 1, 5, and 6.
  • the data includes at least one of the following: data carried on the physical broadcast channel PBCH, data carried on the physical downlink control channel PDCCH, and data carried on the physical downlink shared channel PDSCH;
  • the public data includes at least one of the following:
  • the main information block MIB data carried in the PBCH is carried in the system information block SIB data of the PDSCH.
  • the reference signal is a single port reference signal or a two port reference signal.
  • the method may further include: receiving the secondary synchronization signal SSS on the time-frequency resource that sends the secondary synchronization signal SSS in the case of performing the foregoing channel measurement or the foregoing RRM measurement.
  • a reference signal sending apparatus which is applied to a base station, and includes: a sending module configured to send a reference signal according to one of the following narrowband in all narrowbands used by the system: Transmitting reference signals on all valid subframes; transmitting reference signals on non-multicast broadcast single frequency network MBSFN subframes and MBSFN subframes with data transmission in all valid subframes; presence data transmission in all valid subframes
  • the reference signal is transmitted on the subframe; the reference signal is transmitted on the predefined subframe in all valid subframes and the non-predefined subframe in which the data transmission exists; wherein the valid subframe is a subframe having the capability of transmitting system data.
  • a receiving device for a reference signal which is applied to a terminal, and includes: a first receiving module, configured to receive a reference signal on a first time-frequency resource when receiving data, Or receiving a reference signal and a long-term evolution LTE cell-specific reference signal CRS on the first time-frequency resource; wherein, the first time-frequency resource is a time-frequency resource occupied by the received data; and the second receiving module is configured to execute the channel
  • the second time-frequency resource at least one of the following is received on the second time-frequency resource: a reference signal, an LTE CRS; wherein the second time-frequency resource is one of: in a primary narrowband or a non-primary narrowband M subframes, located in M subframes of X different narrowbands; where M is an integer greater than 0 and X is an integer greater than one.
  • a transmission system of a reference signal comprising: a base station including the above transmitting apparatus and a terminal of the above receiving apparatus.
  • the reference signal is transmitted in one of the following ways: transmitting the reference signal on all valid subframes; the non-multicast broadcast single frequency network MBSFN subframe in all valid subframes And transmitting a reference signal on an MBSFN subframe in which data transmission exists; on a subframe in which all data transmission is present in all valid subframes Transmitting a reference signal; transmitting a reference signal on a predefined subframe in all valid subframes and a non-predefined subframe in which data transmission exists, solving the related art in the case where multiple narrowbands are simultaneously used in the NB-IoT system How to transmit the problem of NB-RS.
  • FIG. 1 is a flowchart of a method of transmitting a reference signal according to an embodiment of the present invention
  • 2a is a two-port reference signal pattern under a normal cyclic prefix CP according to an embodiment of the present invention
  • 2b is a two-port reference signal pattern under an extended CP according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method of receiving a reference signal according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the structure of a transmitting apparatus of a reference signal according to an embodiment of the present invention
  • FIG. 5 is a structural block diagram of a receiving apparatus of a reference signal according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:
  • Step S102 acquiring a reference signal
  • Step S104 For one narrowband of all narrowbands used by the system, send the reference signal according to one of the following manners: transmitting the reference signal on all valid subframes; the non-multicast broadcast single frequency network MBSFN subframe in all valid subframes And transmitting a reference signal on an MBSFN subframe in which data transmission exists; transmitting a reference signal on a subframe in which all data transmission is present in a valid subframe; pre-defined subframe in all valid subframes and non-predefined in presence data transmission The reference signal is transmitted on the subframe; wherein the valid subframe is a subframe having the capability of transmitting system data.
  • the manner of transmitting the reference signal is provided, that is, the manner of transmitting the NB-RS is provided, and the problem of how to transmit the NB-RS in the case where the NB-IoT system uses multiple narrowbands simultaneously is solved in the related art.
  • the transmission of the NB-RS in the above manner avoids that the reference signal is always transmitted in all subframes, thereby avoiding the interference of the NB-IoT system in the in-band In-band operation mode to the LTE system, and also how to solve the problem.
  • the problem of interference of the NB-IoT system in the in-band In-band mode of operation to the LTE system is reduced.
  • step S104 may also solve the above technical problem without directly including S102, but directly by step S104, and is not limited thereto.
  • the reference signal of the present invention is a reference signal of the above system, that is, a narrowband reference signal (NB-RS).
  • NB-RS narrowband reference signal
  • the foregoing system may be a narrowband Internet of Things NB-IoT system, and the foregoing data may be NB-IoT data but is not limited thereto; the reference signal may refer to the NB-IoT system reference signal NB-RS, but not Limited to this.
  • the frequency division duplex FDD system and the in-band In-band operation mode are taken as an example, but are not limited.
  • the number is assumed to be 2
  • the subframes of the 3, 7, and 8 are configured to be used for the multicast and broadcast media service (MBMS) transmission of the LTE system, and the valid subframes may include the numbers 0, 1, 4, and 5.
  • the subframes of 6 and 9, that is, transmitting the reference signals on all valid subframes, may behave as transmitting the reference signals on subframes numbered 0, 1, 4, 5, 6, and 9 of one LTE radio frame.
  • subframes numbered 0, 1, 4, 5, 6, and 9 are 6 valid subframes
  • subframes 1 and 6 are configured as an LTE system multicast broadcast single frequency network (Multicast and Broadcast Single Frequency Network,
  • the reference signal transmitted on the non-MBSFN subframe in all valid subframes and the MBSFN subframe in which the data transmission exists may be expressed as follows: whether there is data transmission on subframes 1, 4, 5 and 9 a reference signal is transmitted, and in subframes 1 and 6, the reference signal is transmitted only on subframes 1 and/or 6 where data transmission exists, and if NB-IoT data transmission does not exist on subframes 1 and/or 6, The reference signal is not transmitted on subframes 1 and/or 6.
  • the transmit reference signal on the frame may behave as: transmitting the reference signal on subframes 0, 4, 5, and 9. Assuming that the predefined subframes in the above 6 valid subframes include subframes 0, 4, 5, and 9, the reference signals are transmitted on the predefined subframes in all the valid subframes and the non-predefined subframes in which the data transmission exists.
  • the reference signal is always transmitted on subframes 0, 4, 5 and 9, and for subframes 1 and 6, if there is data transmission, The reference signal is transmitted on subframes 1 and/or 6 where there is data transmission, and if there is no data transmission on subframes 1 and 6, the reference signal is not transmitted on subframes 1 and/or 6.
  • the above “in one LTE radio frame range” is only a time interval for more clearly explaining the transmission problem of the reference signal, which does not limit the reference signal in other one or more LTE radio frames.
  • the reference signal is sent in the same way.
  • one of the narrowbands used in the above system may be a main narrowband or a non-primary narrowband; wherein the primary narrowband is a narrowband for transmitting the primary synchronization signal PSS and the secondary synchronization signal SSS and the physical broadcast channel PBCH data.
  • the predefined subframe may include at least one of the following subframes: numbers 0, 4, 5, and 9; further, the above number is 0, 4
  • the subframe in which the primary/secondary synchronization signal PSS/SSS transmission does not exist in the subframes of 5, 9 and 9 may be used as the above-mentioned predefined subframe, but is not limited thereto; the narrowband in the above-mentioned one narrowband is a narrowband in the time division duplex TDD system
  • the foregoing predefined subframe may include at least one of the following numbers: 0, 1, and 5. Further, the subframe in which the primary/secondary synchronization signal PSS/SSS transmission does not exist in the subframes numbered 0, 1, 5, and 6 described above may be used as the above-described predefined subframe, and is not limited thereto.
  • the primary narrowband and the non-primary narrowband in all the narrowbands used by the above system have different effective subframes
  • the FDD system and the In-band operation mode are taken as an example, and the primary/secondary synchronization is used in the above-mentioned primary narrowband.
  • the subframe of the signal PSS/SSS is generally not used as a valid subframe of the primary narrowband, but the subframe number in one of the above-mentioned non-primary narrowbands is the same as the number of the PSS/SSS subframe transmitted in the primary narrowband described above.
  • a valid subframe in the main narrowband is used, in which case the dominant narrowband has a different effective subframe than the non-primary narrowband.
  • the PSS/SSS of the present invention is the PSS/SSS of the above system;
  • the subframe of the present invention is a subframe within one narrowband (primary narrowband or non-primary narrowband) of all narrowbands.
  • the valid subframe is a valid subframe within one of all narrowbands (primary narrowband or non-primary narrowband).
  • main narrow band is also called an Anchor narrow band.
  • one narrowband of all narrowbands used by the above system is equal to the uplink and downlink transmission bandwidth of the system, which is the same as the bandwidth of one physical resource block PRB of the Long Term Evolution (LTE) system, for example, the bandwidth of 180 kHz, and thus the above one narrowband It is also possible to use a PRB instead of, and is not limited to this.
  • LTE Long Term Evolution
  • the foregoing reference signal is used for demodulating data or performing channel measurement or performing Radio Resource Management (RRM) measurement on the terminal device; wherein the RRM measurement includes reference signal received power (Reference Signal Received Power) , referred to as RSRP) Measurement and Reference Signal Received Quality (RSRQ) measurement.
  • RRM Radio Resource Management
  • RSRP Reference Signal Received Power
  • RSSQ Reference Signal Received Quality
  • the data may include at least one of the following: data carried on the physical broadcast channel PBCH, and data carried on the physical downlink control channel (PDCCH), which is carried on the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH for short) )The data.
  • the above reference signal may be a single port reference signal or a two port reference signal.
  • FIG. 2a is a reference signal pattern of a two-port under a normal Cyclic Prefix (CP) according to an embodiment of the present invention
  • FIG. 2b is a reference signal pattern of a two-port under an extended CP according to an embodiment of the present invention.
  • the same subcarrier is used in the frequency domain with the LTE cell-specific reference signal (CRS), and the subframe is occupied in the time domain.
  • OFDM orthogonal frequency division multiplexing
  • the reference signals may be transmitted in the same manner, for example, the reference signals may all be transmitted on all valid subframes, but are not limited thereto, of course, for the main narrowband and
  • the non-primary narrowband may also transmit reference signals in different manners, such as when the primary narrowband transmits reference signals on all valid subframes, or according to non-MBSFN subframes and existing data transmission MBSFNs in all valid subframes.
  • the non-primary narrowband transmits the reference signal in one of the following manners: the reference signal is transmitted on the subframe in which the data transmission exists in all valid subframes, and the predefined subframe is defined in all valid subframes. Frame and data transmission The reference signal is transmitted on the non-predefined subframe; or, when the primary narrowband transmits the reference signal in a manner of transmitting the reference signal on the predefined subframe in all valid subframes and the non-predefined subframe in which the data transmission exists, the non-primary narrowband is The reference signal is transmitted in such a manner that the reference signal is transmitted on the data transmission subframe in all valid subframes; it is not limited thereto.
  • the LTE CRS when the operation mode of the foregoing system is an in-band In-band operation, the LTE CRS is always present regardless of the foregoing system (that is, the base station always sends the LTE CRS), and at this time, The LTE CRS information may be instructed to the terminal device.
  • the foregoing LTE CRS information is indicated by at least one of the following: a Master Information Block (MIB) signaling carried in the PBCH, and a system carried in the PDSCH.
  • MIB Master Information Block
  • the SIB is one of all the SIB types supported by the foregoing system, for example, the first SIB type (SIB1 for short); the LTE CRS information includes at least one of the following: port number information. , sequence information, precoding matrix information, power information; not limited to this.
  • LTE CRS and the foregoing reference signal may be used for demodulating data and performing channel or RRM measurement at the terminal; or the LTE CRS may be used for channel or RRM measurement at the terminal.
  • the above sequence information may include at least one of the following, but is not limited thereto:
  • consecutive L subframes or active subframes may use the same reference signal sequence, where L is an integer greater than one; wherein all of the narrowbands described above A narrow band in the main narrow band or a non-main narrow band.
  • the same number of valid subframes in different narrowbands of all narrowbands used by the above system may use the same or different reference signal sequences; wherein, using different reference signal sequences may include : A valid subframe in one narrowband uses a reference signal sequence equal to the LTE CRS sequence corresponding to the valid subframe.
  • the effective subframe may include subframes in which there is no PSS/SSS transmission in all subframes; that is, all within one radio frame range ( For example, in 10 subframes, subframes in which there is no PSS/SSS transmission are valid subframes.
  • FIG. 3 is a flowchart of a method for receiving a reference signal according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps:
  • Step S302 in the case of receiving data, receiving a reference signal on the first time-frequency resource, or receiving the reference signal and the long-term evolution LTE cell-specific reference signal CRS on the first time-frequency resource; wherein, the first time-frequency The resource is a time-frequency resource occupied by the received data; in the case of performing channel measurement or radio resource management RRM measurement, receiving at least one of the following on the second time-frequency resource: a reference signal, an LTE CRS; wherein, the second time-frequency The resource is one of the following: located in the main narrow band or M subframes in the non-primary narrowband, located in M subframes in X different narrowbands; where M is an integer greater than 0, and X is an integer greater than one;
  • Step S304 demodulating the received data by using the received reference signal and/or LTE CRS, or performing channel measurement or radio frequency resource management RRM measurement.
  • the reference signal and/or the LTE CRS are received at different time-frequency resources, thereby solving the related art how to transmit the NB-RS in the case where the NB-IoT system simultaneously uses multiple narrowbands.
  • the problem is to solve the related art how to transmit the NB-RS in the case where the NB-IoT system simultaneously uses multiple narrowbands.
  • step S304 may not be included in the above method, and the above technical problem can be solved only by using the above step S302.
  • the M subframes located in the X different narrowbands indicate that the M subframes are not located in the same narrowband.
  • the terminal device only has narrowband reception capability, that is, does not have the capability of simultaneously receiving two or more subframes located in two or more narrowbands
  • the above M subframes located in X different narrowbands are not included.
  • 6 subframes located in 4 different narrowbands may be the following 6 subframes: subframe 0 and subframe 1 in the first narrowband, and subframe 4 in the second narrowband And subframe 5, subframe 6 in the third narrowband, subframe 9 in the fourth narrowband.
  • the above-mentioned main narrow band is the main narrow band among all the narrow bands used by the system
  • the non-main narrow band is one non-main narrow band among all the narrow bands used by the system
  • the X different narrow bands are X different in all the narrow bands used by the system.
  • the primary narrowband is a narrowband for transmitting the primary synchronization signal PSS and the secondary synchronization signal SSS and the physical broadcast channel PBCH data.
  • the above system may be a narrowband Internet of Things NB-IoT system
  • the above data may be NB-IoT data
  • the reference signal may be an NB-IoT reference signal NB-RS, but is not limited thereto; one of all narrowbands used by the above system
  • the narrowband is equal to the uplink and downlink transmission bandwidth of the system, which is the same as the bandwidth of one physical resource block PRB of the Long Term Evolution (LTE) system, for example, the bandwidth of 180 Hz. Therefore, the above narrowband can also be replaced by a PRB, and is not limited thereto.
  • LTE Long Term Evolution
  • the time-frequency resource occupied by the received data may be at least one valid subframe in a narrowband (primary narrowband or non-primary narrowband), or in different narrowbands (including the primary narrowband and the non-primary narrowband).
  • the time-frequency resources occupied by the data received by the terminal device may be three valid subframes located in the main narrowband (for example, a subframe).
  • 0, subframe 4 and subframe 5 may be 4 valid subframes located in a non-primary narrowband (eg, subframe 0, subframe 4, subframe 5, and subframe 9); or, may be located in different narrowbands
  • the four valid subframes are, for example, located in two different non-primary narrowbands, and the time-frequency resource occupied by the received data is a non- Subframe 0 and subframe 4 in the main narrowband and subframe 5 and subframe 9 in the other non-primary narrowband.
  • the foregoing M subframes may include at least one of the following: consecutive M valid subframes; consecutive M non-multicast broadcast single frequency network MBSFN subframes in all valid subframes; consecutive in all valid subframes M subframes with public data transmission; consecutive M predefined subframes in all valid subframes; consecutive M designated subframes in all valid subframes; wherein the designated subframe includes one of the following: non-MBSFN sub- a frame and an MBSFN subframe in which public data transmission exists; a predefined subframe and a non-predefined subframe in which public data transmission exists; a non-MBSFN subframe, and a unicast transmitted to the terminal device An MBSFN subframe for data transmission and an MBSFN subframe with public data transmission; a predefined subframe, a non-predefined subframe in which unicast data is transmitted to the terminal device, and a non-predefined subframe in which public data transmission exists;
  • the valid subframe is a subframe having the capability of transmitting system
  • the primary narrowband and the non-primary narrowband in all the narrowbands used by the above system have different effective subframes
  • the FDD system and the In-band operation mode are taken as an example, and the primary/secondary synchronization is used in the above-mentioned primary narrowband.
  • the subframe of the signal PSS/SSS is generally not used as a valid subframe of the primary narrowband, but the subframe number in one of the above-mentioned non-primary narrowbands is the same as the number of the PSS/SSS subframe transmitted in the primary narrowband described above.
  • a valid subframe in the main narrowband is used, in which case the dominant narrowband has a different effective subframe than the non-primary narrowband.
  • the specific meaning of the foregoing M subframes is such that the reference signal can be sent on the M subframes defined above on the second time-frequency resource, thereby avoiding interference of the NB-IoT system to the LTE system.
  • a scheme for receiving a reference signal on a first time-frequency resource in the case of receiving data transmitted by a base station is described, but is not limited thereto, within an LTE radio frame range.
  • the terminal When receiving the data sent by the base station, the device simultaneously receives the data and the reference signal on all valid subframes (the first time-frequency resource) of the narrowband; for example, it assumes that the data sent by the base station to the terminal device in the LTE radio frame range occupies one Subframe 0 and subframe 1 of the narrowband (first narrowband), and subframe 4, subframe 5, subframe 6 and subframe 9 occupying another narrowband (second narrowband), when the terminal device receives the data transmitted by the base station Receiving data and reference signals simultaneously in subframe 0 and subframe 1 of the first narrowband and subframe 4, subframe 5, subframe 6 and subframe 9 (first time-frequency resource) of the second narrowband; The reference signal is used to demodulate the above data.
  • the terminal device is The RRM measurement is started at the start of an LTE radio frame, and it is assumed that for one of the narrowbands described above, the subframes numbered 2, 3, 7, and 8 are configured for MBMS transmission for the LTE system, at the primary ( Anchor) Subframe 9 in the narrowband is used for PSS/SSS transmission, then for non-primary narrowband, the above valid subframe may include subframes numbered 0, 1, 4, 5, 6, and 9, for the main narrowband, the above The valid subframe may include subframes numbered 0, 1, 4, 5, and 6, assuming that the terminal device receives the reference signal on consecutive M valid subframes in the primary narrowband, M is an integer greater than 0, if M is equal to 5, then receiving the reference signal on the consecutive M valid subframes may be represented as receiving the reference
  • subframe 1 and subframe 6 of the five active subframes of the primary narrowband are configured as MBSFN subframes of the LTE system, and the terminal equipment receives on consecutive M non-MBSFN subframes in all valid subframes of the primary narrowband.
  • the reference signal if the above M is equal to 5, receiving the reference signal on consecutive M non-MBSFN subframes in all the valid subframes described above may be expressed as: subframe 0, subframe 4, and subframe 5 of the radio frame and the next one Receiving a reference signal on subframe 0 and subframe 4 of the radio frame; or, the terminal device receives the reference signal on consecutive M designated valid subframes in all valid subframes of the main narrowband, M is an integer greater than 0, wherein the specified valid subframe includes a non-MBSFN subframe in all valid subframes of the primary narrowband and an MBSFN subframe in which public data transmission exists, for example, if subframe 1 in the valid subframe (MBSFN subframe) is used for public data transmission and M is equal to 6, then the reference signal received on consecutive M designated subframes in all the valid subframes described above may be expressed as: subframe 0, subframe in the LTE radio frame 1. Subframe 4 and subframe 5 and subframe 0 and subframe 1 of the next LTE radio frame receive reference signals
  • the terminal device has valid Ms of public data transmission in consecutive M of all valid subframes of the primary narrowband.
  • the reference signal is received on the frame, and M is an integer greater than 0; for example, if the above M is equal to 6, the reference signal received on the consecutive M subframes in which the public data exists in all the valid subframes may be expressed as: Subframe 0, subframe 4, and subframe 5 of the frame and subframe 0, subframe 4, and subframe 5 of the next radio frame receive reference signals.
  • the terminal device consecutively M predefined subframe subframes in all valid subframes of the primary narrowband.
  • Receiving the reference signal if the above M is equal to 6, receiving the reference signal on consecutive M predefined subframes in all the valid subframes may be represented as: subframe 0, subframe 4, and subframe 5 in the LTE radio frame.
  • the terminal device receives the reference signal on consecutive M designated valid subframes in all valid subframes of the primary narrowband, where M is An integer greater than 0, wherein the specified valid subframe includes a predefined subframe in all valid subframes of the primary narrowband and a non-predefined subframe in which the public data transmission exists, for example, assuming subframe 1 in the valid subframe (Non-predefined subframe) is used for public data transmission and M is equal to 6, then the reference signal received on consecutive M designated subframes in all the valid subframes described above may be expressed as: subframe 0 in the LTE radio frame. , subframe 1, subframe 4, and subframe 5 and below Receiving a reference signal on a sub-frame 0 and sub-frame of an LTE radio frame.
  • the above scheme or implementation for receiving the reference signal on the primary narrowband is also applicable to receiving the reference signal on a non-primary narrowband, but in the above-mentioned one non-primary narrowband.
  • the valid subframe can be different from the valid subframe in the primary narrowband.
  • the terminal device receives the reference signal on the consecutive M valid subframes in the first, second, and third narrowbands where the public data transmission exists, where M is an integer greater than 0;
  • M is an integer greater than 0;
  • the terminal device receiving the reference signal on the effective subframes in which the six consecutive public data transmissions exist in the first, second, and third narrowbands may be expressed as: within the LTE radio frame range, Subframe 0 in the first narrowband, subframe 4 and subframe 5 in the second narrowband, subframe 9 in the third narrowband, and subframe in the first narrowband in the next LTE radio frame range 0.
  • the reference signal is received on subframe 4 in the second narrowband.
  • the signal received on the first time-frequency resource may be determined according to at least one of the following: an operation mode, a data type, and an overlay level; wherein the operation mode may include an in-band In-band operation
  • the guard band has Guard band operation and independent Stand-alone operation.
  • the narrowband type may include a primary narrowband and a non-primary narrowband.
  • the data type may include data received before acquiring LTE CRS information and data received after acquiring LTE CRS information.
  • the foregoing coverage levels may generally include three levels: normal coverage, robust coverage, and extreme coverage. Different coverage levels correspond to different sets of repeated transmission times; normal coverage corresponds to a relatively small number of repeated transmissions, and extreme coverage corresponds to relative levels. Large number of repeated transmissions.
  • the received data is data received before acquiring the LTE CRS information
  • only the reference signal is received on the first time-frequency resource, and the received data is obtained by acquiring the LTE CRS information.
  • the reference signal and the LTE CRS are simultaneously received on the first time-frequency resource;
  • the operating mode of the system is an In-band operation
  • the received data is data received before acquiring the LTE CRS information
  • only the reference signal is received on the first time-frequency resource
  • the received data is obtained by acquiring the LTE CRS information.
  • the received data is received, if the coverage level of the terminal device corresponds to extreme coverage, the reference signal and the LTE CRS are simultaneously received on the first time-frequency resource, otherwise only the reference signal is received on the first time-frequency resource.
  • the operating mode of the system is Guard band operation or Standalone operation, only the reference signal is received on the first time-frequency resource.
  • the signal received on the second time-frequency resource may be determined according to at least one of the following: an operation mode, a narrowband type; wherein the operation mode may include an in-band In-band operation, a guard band Guard band operation and independent Stand-alone operation, narrowband types can include primary narrowband and non-master narrowband.
  • the LTE CRS and the reference signal are simultaneously received on the second time-frequency resource; or, when the operating mode of the system is In-band operation, the second time-frequency resource is When the time-frequency resource of the main narrowband is used, the reference signal and the LTE CRS are simultaneously received on the second time-frequency resource, and when the second time-frequency resource is a non-primary narrowband time-frequency resource, only the LTE is received on the second time-frequency resource.
  • CRS when the operating mode of the system is Guard band operation or Standalone operation, only the reference signal is received on the second time-frequency resource.
  • the terminal device may receive signaling for indicating LTE CRS information, where the signaling includes at least one of: being carried in the PBCH.
  • the LTE CRS information includes at least one of the following: port number information, sequence information, precoding matrix information, and power information;
  • the foregoing sequence information includes at least one of the following: an index of a first element of the LTE CRS sequence used by the primary narrowband in the maximum length LTE CRS sequence, and a location of the non-primary narrowband in the LTE system bandwidth relative to the primary narrowband in the LTE system bandwidth. Position offset, LTE system bandwidth, index of PRB occupied by the main narrowband in the bandwidth of the LTE system, and index of the PRB occupied by the non-primary narrowband in the bandwidth of the LTE system;
  • the maximum length LTE CRS sequence is an LTE CRS sequence used for maximum LTE system bandwidth.
  • receiving the LTE CRS on the first time-frequency resource may include: when the port number K 1 of the reference signal is less than or equal to the port number K 2 of the LTE CRS, the LTE may be received in one of the following manners: CRS: LTE CRS receiving K 1 ports numbered 0 to K 1 -1; LTE CRS receiving K 2 ports numbered 0 to K 2 -1; wherein K 1 , K 2 are positive integers .
  • the LTE CRS on the second time-frequency resource may include: receiving the LTE CRS in one of the following manners: receiving the LTE CRS of one port numbered 0; the receiving number is 0 to K 2 - K 2 th LTE CRS ports 1; wherein K 2 is the number of ports and K 2 LTE CRS is a positive integer. It should be noted that K 2 may be 1 or 2 or 4.
  • the predefined subframe may include at least one of the following subframes: numbers 0, 4, 5, and 9; further, the foregoing number is 0, 4,
  • the subframe in which the primary/secondary synchronization signal PSS/SSS transmission does not exist in the subframes of 5 and 9 may be used as the above-mentioned predefined subframe, but is not limited thereto; in the case where the system is a time division duplex TDD system, the predefined sub-frame
  • the frame may include at least one of the following subframes: subframes numbered 0, 1, 5, and 6.
  • the data includes at least one of the following: data carried on the physical broadcast channel PBCH, data carried on the physical downlink control channel PDCCH, data carried on the physical downlink shared channel PDSCH; public data includes at least one of the following: data carried on the PBCH System information block SIB data carried in the PDSCH; wherein the SIB includes at least one of all SIB types supported by the system, for example, the SIB includes the first SIB type (SIB1), or the second SIB type (SIB2), or , the first SIB type and the second SIB type, or all SIB types.
  • SIB1 SIB
  • SIB2 second SIB type
  • the foregoing method may further include: receiving, when performing the foregoing channel measurement or the foregoing RRM measurement, receiving the secondary frequency resource on the secondary synchronization signal SSS. Synchronization signal SSS. That is, in the case of performing channel measurement or RRM measurement, the terminal device may receive the SSS on the time-frequency resource of the secondary synchronization signal SSS in addition to receiving the reference signal and/or the LTE CRS on the second time-frequency resource, to further Enhance the performance or accuracy of channel measurements or RRM measurements.
  • the reference signal is a single-port reference signal or a two-port reference signal, as shown in FIG. 2a and FIG. 2b.
  • a two-port reference signal uses the same subcarrier in the frequency domain as the LTE cell-specific reference signal CRS.
  • the last two orthogonal frequency division multiplexing OFDM symbols of each time slot in the subframe are occupied in the time domain, and the pattern of the reference signal of the single port is the same as the pattern of one of the ports of the reference signal of the two ports.
  • the reference signal is transmitted on all valid subframes
  • the reference signal is transmitted on the subframe in which the NB-IoT data transmission exists in all valid subframes; when the terminal device receives the base station When the NB-IoT data is transmitted (the first scenario), the reference signal is received on the time-frequency resource (the first time-frequency resource) that receives the NB-IoT data; when the terminal device performs the channel or the RRM measurement (the second scenario), A reference signal is received on consecutive M (greater than 0 integer) valid subframes (second time-frequency resources) in the Anchor Narrowband.
  • the operation mode of the NB-IoT system is In-band operation, and the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrow bands of 180 kHz), and is named as the first, second, third, and Four PRBs; wherein the first PRB is used as an Anchor narrowband, at least for transmitting NB-PSS/SSS signals and NB-PBCH data.
  • subframe 2 subframe 3 subframe 7, and subframe 8 are configured for MBMS transmission of the LTE system and subframe 9 in the Anchor narrowband.
  • the subframe ie, the effective subframe
  • the subframe that can be used to transmit the NB-IoT data includes five, specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 6
  • the subframes ie, valid subframes
  • the subframes include six, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 9.
  • the transmission process of the NB-IoT reference signal is as follows:
  • the reference signal is transmitted on subframe 0, subframe 1, subframe 4, subframe 5, and subframe 6 (ie, on all valid subframes);
  • an LTE radio frame range if all valid subframes within the LTE radio frame range (ie, the above subframe 0, subframe 1, subframe 4, subframe 5, subframe 6, and subframe 9) If there is no NB-IoT data transmission, the reference signal will not be transmitted within the LTE radio frame range; if part of the valid subframes within the LTE radio frame range (eg, subframe 0, subframe 4, subframe) 6 and subframe 9) there is NB-IoT data transmission, then the reference signal is transmitted on subframe 0, subframe 4, subframe 6 and subframe 9; if all valid subframes (6) in the LTE radio frame The NB-IoT data transmission exists on all, and the reference signal is transmitted on all valid subframes.
  • the NB-IoT data is data carried in the NB-PBCH or data carried in the NB-PDCCH or data carried in the NB-PDSCH. .
  • the reference signal is a single port or a two port; taking a two-port reference signal as an example, for normal and extended CP types, the reference signal patterns are respectively shown in FIG. 2a and FIG. 2b, that is, the reference signal is in the frequency domain and LTE.
  • the CRS uses the same subcarriers, occupying the last two OFDM symbols of each slot in the subframe in the time domain.
  • the reference signal pattern is the same as the pattern of one of the two port reference signal patterns.
  • the subframe of the NB-IoT data may include a subframe in which no NB-PSS/SSS transmission exists in all subframes; that is, there is no NB-PSS/SSS transmission in all subframes in one radio frame.
  • the subframes are all valid subframes.
  • the reception process of the NB-IoT reference signal is as follows:
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies all valid subframes of the third PRB (subframe 0, subframe 1, subframe 4) , subframe 5, subframe 6 and subframe 9)
  • the terminal device receives the NB-IoT data sent by the base station (the first scenario)
  • all the valid subframes in the third PRB the time frequency of receiving the NB-IoT data
  • the NB-IoT data and the reference signal are simultaneously received on the resource, that is, the first time-frequency resource.
  • the reference signal is used to demodulate the NB-IoT data;
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies the subframe 0 and the subframe 1 of the second PRB and the subframe 4 and the subframe 5 occupied by the fourth PRB
  • Subframe 6 and subframe 9 when the terminal device receives the NB-IoT data transmitted by the base station (the first scene), the subframe 0 and the subframe 1 of the second PRB, and the subframe 4 and the subframe of the fourth PRB 5.
  • the subframe 6 and the subframe 9 (the time-frequency resource of the received data, that is, the first time-frequency resource) simultaneously receive the NB-IoT data and the reference signal, where the reference signal is used to demodulate the NB-IoT data.
  • the terminal device starts performing channel or RRM measurement at the start time of an LTE radio frame.
  • the terminal device receives the reference signal on consecutive M valid subframes in the first PRB, and M is an integer greater than 0; for example, if If the M is equal to 5, the terminal device starts from the LTE radio frame start time, and the consecutive 5 valid subframes in the first PRB (that is, the subframe 0, the subframe 1, the subframe 4, and the subframe of the LTE radio frame) 5 and sub-frame 6) receiving the reference signal; as another example, if M is equal to 8, the terminal device starts from the LTE radio frame start time, consecutive 8 valid subframes in the first PRB (ie, the LTE radio Receiving reference signals on subframe 0, subframe 1, subframe 4, subframe 5, and subframe 6 of the frame and subframe 0, subframe 1 and subframe 4 of the next LTE radio frame;
  • the RRM measurement includes RSRP measurement and RSRQ measurement.
  • the reference signal is transmitted on the non-MBSFN subframe in all valid subframes and the MBSFN subframe in which the NB-IoT data transmission exists, and the non-Anchor narrowband exists in all valid subframes.
  • the reference signal is sent on the subframe of the NB-IoT data transmission; when the terminal device receives the NB-IoT data sent by the base station (the first scenario), the reference signal is received on the time-frequency resource (the first time-frequency resource) of the received data; When the terminal device performs channel measurement or RRM measurement (second scenario), consecutive M (greater than 0 integer) non-MBSFN subframes in all valid subframes of the Anchor narrowband, or in all valid subframes of the Anchor narrowband The reference signal is received on consecutive M designated subframes (the designated subframe includes a non-MBSFN subframe and an MBSFN subframe in which a public NB-IoT data transmission exists).
  • the operation mode of the NB-IoT system is In-band operation, and the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrow bands of 180 kHz), and is named as the first, second, third, and Four PRBs; wherein the first PRB is used as an Anchor narrowband, at least for transmitting NB-PSS/SSS signals and NB-PBCH data.
  • subframe 2 subframe 3 subframe 7, and subframe 8 are configured for MBMS transmission of the LTE system and subframe 9 in the Anchor narrowband.
  • the subframe ie, the effective subframe
  • the subframe that can be used for transmitting the NB-IoT data includes five, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 6
  • the subframes ie, valid subframes
  • the subframes include six, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 9.
  • the transmission process of the NB-IoT reference signal is as follows:
  • For the first PRB (ie, Anchor narrowband), take an LTE radio frame range as an example.
  • subframe 1 and subframe 6 of the 5 valid subframes are configured as LTE system MBSFN subframes, it does not depend on whether there is NB-IoT data transmission, on subframe 0, subframe 4, and subframe 5 (ie, at The reference signal is always transmitted on the non-MBSFN subframes in all valid subframes; for subframe 1 or subframe 6, if there is NB-IoT data transmission, the reference signal is transmitted on the subframe if NB-IoT does not exist For data transmission, the reference signal is not transmitted on the subframe.
  • an LTE radio frame range if all valid subframes within the LTE radio frame range (ie, the above subframe 0, subframe 1, subframe 4, subframe 5, subframe 6, and subframe 9) If there is no NB-IoT data transmission, the reference signal will not be transmitted within the LTE radio frame range; if part of the valid subframes within the LTE radio frame range (eg, subframe 0, subframe 4, subframe) 6 and subframe 9) there is NB-IoT data transmission, then the reference signal is transmitted on subframe 0, subframe 4, subframe 6 and subframe 9; if all valid subframes (6) in the LTE radio frame The NB-IoT data transmission exists on all, and the reference signal is transmitted on all valid subframes.
  • the NB-IoT data is data carried in the NB-PBCH or data carried in the NB-PDCCH or data carried in the NB-PDSCH. .
  • the reference signal is a single port or a two port; taking a two-port reference signal as an example, for normal and extended CP types, the reference signal patterns are respectively shown in FIG. 2a and FIG. 2b, that is, the reference signal is in the frequency domain and LTE.
  • the CRS uses the same subcarriers, occupying the last two OFDM symbols of each slot in the subframe in the time domain.
  • the reference signal pattern is the same as the pattern of one of the two port reference signal patterns.
  • the subframe of the NB-IoT data may include a subframe in which no NB-PSS/SSS transmission exists in all subframes; that is, there is no NB-PSS/SSS transmission in all subframes in one radio frame.
  • the subframes are all valid subframes.
  • the reception process of the NB-IoT reference signal is as follows:
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies all valid subframes of the third PRB (subframe 0, subframe 1, subframe 4) , subframe 5, subframe 6 and subframe 9)
  • the terminal device receives the NB-IoT data sent by the base station (first scenario)
  • all valid subframes in the third PRB receiveive time-frequency resources of the NB-IoT data
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies the subframe 0 and the subframe 1 of the second PRB and the subframe 4 and the subframe 5 occupied by the fourth PRB, Subframe 6 and subframe 9, when the terminal device receives the NB-IoT data sent by the base station (the first scene), in the subframe 0 and the subframe 1 of the second PRB, And simultaneously receiving the NB-IoT data and the reference signal on the subframe 4, the subframe 5, the subframe 6 and the subframe 9 of the fourth PRB (the time-frequency resource of the received data, that is, the first time-frequency resource), wherein the reference The signal is used to demodulate the above NB-IoT data.
  • subframe 1 and subframe 6 in the effective subframe are configured as LTE system MBSFN subframes, and the terminal device starts performing channel or RRM measurement at the start time of one LTE radio frame;
  • the terminal device receives the reference signal on the consecutive M non-MBSFN valid subframes in the first PRB, where M is greater than 0 integer; for example, if M is equal to 5, the terminal device starts from the LTE radio frame start time, Receiving a reference signal on consecutive five non-MBSFN valid subframes in the first PRB (ie, subframe 0, subframe 4, and subframe 5 of the LTE radio frame and subframe 0 and subframe 4 of the next LTE radio frame); Alternatively, the terminal device receives the reference signal on consecutive M designated valid subframes in the first PRB, where M is an integer greater than 0, wherein the designated valid subframe includes non-MBSFN in all valid subframes of the first PRB a subframe and an MBSFN subframe in which a public NB-IoT data transmission exists; for example, if subframe 1 in the effective subframe is used for public NB-IoT data transmission and M is equal to 6, the terminal device starts from the LTE radio frame Starting at the beginning, consecutive 6 designated
  • the RRM measurement includes RSRP measurement and RSRQ measurement.
  • the public NB-IoT data is data carried in the NB-PBCH or SIB data carried in the NB-PDSCH.
  • the reference signal is transmitted on the subframe in which the NB-IoT data transmission exists in all valid subframes; when the terminal device receives the NB-IoT data sent by the base station ( a first scenario), receiving a reference signal on a time-frequency resource (first time-frequency resource) that receives NB-IoT data; and when the terminal device performs channel measurement or RRM measurement (second scenario), all valid children in the narrow band of Anchor Continuous M (integer greater than 0) in the frame receives the reference signal on the subframe in which the public NB-IoT data transmission exists.
  • the operation mode of the NB-IoT system is In-band operation, and the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrow bands of 180 kHz), and is named as the first, second, third, and Four PRBs; wherein the first PRB is used as an Anchor narrowband, at least for transmitting NB-PSS/SSS signals and NB-PBCH data.
  • subframe 2 subframe 3 subframe 7, and subframe 8 are configured for MBMS transmission of the LTE system and subframe 9 in the Anchor narrowband.
  • the subframe ie, the effective subframe
  • the subframe that can be used for transmitting the NB-IoT data includes five, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 6
  • the subframes ie, valid subframes
  • the subframes include six, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 9.
  • the transmission process of the NB-IoT reference signal is as follows:
  • For the first PRB (ie, Anchor narrowband), take an LTE radio frame range as an example.
  • the reference signal is transmitted on the above subframe 0, subframe 4, and subframe 5.
  • an LTE radio frame range if all valid subframes within the LTE radio frame range (ie, the above subframe 0, subframe 1, subframe 4, subframe 5, subframe 6, and subframe 9) If there is no NB-IoT data transmission, the reference signal will not be transmitted within the LTE radio frame range; if part of the valid subframes within the LTE radio frame range (eg, subframe 0, subframe 4, subframe) 6 and subframe 9) there is NB-IoT data transmission, then the reference signal is transmitted on subframe 0, subframe 4, subframe 6 and subframe 9; if all valid subframes (6) in the LTE radio frame The NB-IoT data transmission exists on all, and the reference signal is transmitted on all valid subframes.
  • the NB-IoT data is data carried in the NB-PBCH or data carried in the NB-PDCCH or data carried in the NB-PDSCH. .
  • the reference signal is a single port or a two port; taking a two-port reference signal as an example, for normal and extended CP types, the reference signal patterns are respectively shown in FIG. 2a and FIG. 2b, that is, the reference signal is in the frequency domain and LTE.
  • the CRS uses the same subcarriers, occupying the last two OFDM symbols of each slot in the subframe in the time domain.
  • the reference signal pattern is the same as the pattern of one of the two port reference signal patterns.
  • the subframe of the NB-IoT data may include a subframe in which no NB-PSS/SSS transmission exists in all subframes; that is, there is no NB-PSS/SSS transmission in all subframes in one radio frame.
  • the subframes are all valid subframes.
  • the reception process of the NB-IoT reference signal is as follows:
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies all valid subframes of the third PRB (subframe 0, subframe 1, subframe 4) , subframe 5, subframe 6 and subframe 9)
  • the terminal device receives the NB-IoT data sent by the base station (first scenario)
  • all valid subframes in the third PRB receiveive time-frequency resources of the NB-IoT data
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies the subframe 0 and the subframe 1 of the second PRB and the subframe 4 and the subframe 5 occupied by the fourth PRB
  • Subframe 6 and subframe 9 when the terminal device receives the NB-IoT data transmitted by the base station (the first scene), the subframe 0 and the subframe 1 of the second PRB, and the subframe 4 and the subframe of the fourth PRB 5.
  • Subframe 6 and subframe 9 time-frequency resources for receiving data, that is, first time-frequency resources
  • the NB-IoT data and the reference signal are simultaneously received, wherein the reference signal is used to demodulate the NB-IoT data.
  • the terminal device receives the reference signal on the consecutive M valid subframes in which the public NB-IoT data transmission exists in the first PRB, where M is an integer greater than 0; for example, if M is equal to 5, the terminal device from the LTE Starting from the start of the radio frame, there are five consecutive active subframes of the public NB-IoT data transmission in the first PRB (ie, subframe 0, subframe 4 and subframe 5 of the LTE radio frame, and the next LTE radio frame) Receiving a reference signal on subframe 0 and subframe 4);
  • the RRM measurement includes RSRP measurement and RSRQ measurement.
  • the public NB-IoT data is data carried in the NB-PBCH or SIB data carried in the NB-PDSCH.
  • the reference signal is transmitted on the predefined subframe in all valid subframes and the non-predefined subframe in which the NB-IoT data transmission exists, and for the non-Anchor narrowband, in all the valid subframes
  • the reference signal is transmitted on the subframe in which the NB-IoT data transmission exists in the frame; when the terminal device receives the NB-IoT data transmitted by the base station (the first scenario), and receives the time-frequency resource of the NB-IoT data (the first time-frequency) Receiving a reference signal on the resource; when the terminal device performs channel measurement or RRM measurement (second scenario), consecutive M (integer greater than 0) pre-defined subframes in all valid subframes of the Anchor Narrowband, or
  • the anchor narrowband carries received reference signals on consecutive M designated subframes in all valid subframes (the designated subframe includes a predefined subframe and a non-predefined subframe in which a public NB-IoT data transmission exists).
  • the operation mode of the NB-IoT system is In-band operation, and the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrow bands of 180 kHz), and is named as the first, second, third, and Four PRBs; wherein the first PRB is used as an Anchor narrowband, at least for transmitting NB-PSS/SSS signals and NB-PBCH data.
  • subframe 2 subframe 3 subframe 7, and subframe 8 are configured for MBMS transmission of the LTE system and subframe 9 in the Anchor narrowband.
  • the subframe ie, the effective subframe
  • the subframe that can be used for transmitting the NB-IoT data includes five, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 6
  • the subframes ie, valid subframes
  • the subframes include six, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 9.
  • the transmission process of the NB-IoT reference signal is as follows:
  • For the first PRB (ie, Anchor narrowband), take an LTE radio frame range as an example.
  • the predefined subframes in the above five valid subframes include subframe 0, subframe 4, and subframe 5, and do not depend on whether there is transmission of NB-IoT data on the subframe, in the subframe 0,
  • the sub-frame 4 and the sub-frame 5 always transmit the reference signal; in addition, for one of the sub-frame 1 and the sub-frame 6, if there is NB-IoT data transmission, the reference signal is transmitted on the sub-frame, if there is no NB- For IoT data transmission, the reference signal is not transmitted on the subframe.
  • an LTE radio frame range if all valid subframes within the LTE radio frame range (ie, the above subframe 0, subframe 1, subframe 4, subframe 5, subframe 6, and subframe 9) If there is no NB-IoT data transmission, the reference signal will not be transmitted within the LTE radio frame range; if part of the valid subframes within the LTE radio frame range (eg, subframe 0, subframe 4, subframe) 6 and subframe 9) there is NB-IoT data transmission, then the reference signal is transmitted on subframe 0, subframe 4, subframe 6 and subframe 9; if all valid subframes (6) in the LTE radio frame The NB-IoT data transmission exists on all, and the reference signal is transmitted on all valid subframes.
  • the NB-IoT data is data carried in the NB-PBCH or data carried in the NB-PDCCH or data carried in the NB-PDSCH. .
  • the reference signal is a single port or a two port; taking a two-port reference signal as an example, for normal and extended CP types, the reference signal patterns are respectively shown in FIG. 2a and FIG. 2b, that is, the reference signal is in the frequency domain and LTE.
  • the CRS uses the same subcarriers, occupying the last two OFDM symbols of each slot in the subframe in the time domain.
  • the reference signal pattern is the same as the pattern of one of the two port reference signal patterns.
  • the subframe of the NB-IoT data may include a subframe in which no NB-PSS/SSS transmission exists in all subframes; that is, there is no NB-PSS/SSS transmission in all subframes in one radio frame.
  • the subframes are all valid subframes.
  • the reception process of the NB-IoT reference signal is as follows:
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies all valid subframes of the third PRB (subframe 0, subframe 1, subframe 4) , subframe 5, subframe 6 and subframe 9)
  • the terminal device receives the NB-IoT data sent by the base station (first scenario)
  • all valid subframes in the third PRB receiveive time-frequency resources of the NB-IoT data
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies the subframe 0 and the subframe 1 of the second PRB and the subframe 4 and the subframe 5 occupied by the fourth PRB
  • Subframe 6 and subframe 9 when the terminal device receives the NB-IoT data transmitted by the base station (the first scene), the subframe 0 and the subframe 1 of the second PRB, and the subframe 4 and the subframe of the fourth PRB 5.
  • the subframe 6 and the subframe 9 (the time-frequency resource of the received data, that is, the first time-frequency resource) simultaneously receive the NB-IoT data and the reference signal, where the reference signal is used to demodulate the NB-IoT data.
  • the predefined subframes in the above five valid subframes in the first PRB include subframe 0, subframe 4, and subframe 5 and the terminal device starts performing channel or RRM measurement at the start time of one LTE radio frame; , the terminal equipment is at first
  • the reference signal is received on consecutive M predefined valid subframes in the PRB, and M is an integer greater than 0; for example, if M is equal to 5, the terminal device starts from the LTE radio frame start time and is in the first PRB.
  • the terminal device Receiving reference signals on consecutive five predefined valid subframes (ie, subframe 0, subframe 4, and subframe 5 of the LTE radio frame and subframe 0 and subframe 4 of the next LTE radio frame); or, the terminal device Receiving a reference signal on consecutive M designated valid subframes in the first PRB, M being an integer greater than 0, wherein the designated valid subframe includes predefined subframes in all valid subframes of the first PRB and There is a non-predefined subframe of public NB-IoT data transmission; for example, if subframe 1 in the effective subframe is used for public NB-IoT data transmission and M is equal to 6, the terminal device starts from the LTE radio frame Initially, consecutive 6 designated valid subframes in the first PRB (ie, subframe 0, subframe 1, subframe 4, and subframe 5 of the LTE radio frame and subframe 0 and subframe 1 of the next LTE radio frame) Receiving a reference signal;
  • the RRM measurement includes RSRP measurement and RSRQ measurement.
  • the public NB-IoT data is data carried in the NB-PBCH or SIB data carried in the NB-PDSCH.
  • the reference signal is transmitted on the subframe in which the NB-IoT data transmission exists in all valid subframes; when the terminal device receives the NB-IoT data sent by the base station ( a first scenario), receiving a reference signal on a time-frequency resource (first time-frequency resource) that receives NB-IoT data; when the terminal device performs channel measurement or RRM measurement (second scenario), in an Anchor narrowband and a non-Anchor narrowband A reference signal is received on consecutive M subframes (second time-frequency resources) in which all NB-IoT data transmissions exist in all valid subframes.
  • the operation mode of the NB-IoT system is In-band operation, and the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrow bands of 180 kHz), and is named as the first, second, third, and Four PRBs; wherein the first PRB is used as an Anchor narrowband, at least for transmitting NB-PSS/SSS signals and NB-PBCH data.
  • subframe 2 subframe 3 subframe 7, and subframe 8 are configured for MBMS transmission of the LTE system and subframe 9 in the Anchor narrowband.
  • the subframe ie, the effective subframe
  • the subframe that can be used for transmitting the NB-IoT data includes five, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 6
  • the subframes ie, valid subframes
  • the subframes include six, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 9.
  • the transmission process of the NB-IoT reference signal is as follows:
  • For the first PRB (ie, Anchor narrowband), take an LTE radio frame range as an example.
  • an LTE radio frame range if all valid subframes within the LTE radio frame range (ie, the above subframe 0, subframe 1, subframe 4, subframe 5, subframe 6, and subframe 9) If there is no NB-IoT data transmission, the reference signal will not be transmitted within the LTE radio frame range; if part of the valid subframes within the LTE radio frame range (eg, subframe 0, subframe 4, subframe) 6 and subframe 9) there is NB-IoT data transmission, then the reference signal is transmitted on subframe 0, subframe 4, subframe 6 and subframe 9; if all valid subframes (6) in the LTE radio frame The NB-IoT data transmission exists on all, and the reference signal is transmitted on all valid subframes.
  • the NB-IoT data is data carried in the NB-PBCH or data carried in the NB-PDCCH or data carried in the NB-PDSCH. .
  • the reference signal is a single port or a two port; taking a two-port reference signal as an example, for normal and extended CP types, the reference signal patterns are respectively shown in FIG. 2a and FIG. 2b, that is, the reference signal is in the frequency domain and LTE.
  • the CRS uses the same subcarriers, occupying the last two OFDM symbols of each slot in the subframe in the time domain.
  • the reference signal pattern is the same as the pattern of one of the two port reference signal patterns.
  • the subframe of the NB-IoT data may include a subframe in which no NB-PSS/SSS transmission exists in all subframes; that is, there is no NB-PSS/SSS transmission in all subframes in one radio frame.
  • the subframes are all valid subframes.
  • the reception process of the NB-IoT reference signal is as follows:
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies all valid subframes of the third PRB (subframe 0, subframe 1, subframe 4) , subframe 5, subframe 6 and subframe 9)
  • the terminal device receives the NB-IoT data sent by the base station (first scenario)
  • all valid subframes in the third PRB receiveive time-frequency resources of the NB-IoT data
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies the subframe 0 and the subframe 1 of the second PRB and the subframe 4 and the subframe 5 occupied by the fourth PRB
  • Subframe 6 and subframe 9 when the terminal device receives the NB-IoT data transmitted by the base station (the first scene), the subframe 0 and the subframe 1 of the second PRB, and the subframe 4 and the subframe of the fourth PRB 5.
  • the subframe 6 and the subframe 9 (the time-frequency resource of the received data, that is, the first time-frequency resource) simultaneously receive the NB-IoT data and the reference signal, where the reference signal is used to demodulate the NB-IoT data.
  • the RRM measurement includes but is not limited to RSRP measurement and RSRQ measurement.
  • the public NB-IoT data is data carried in the NB-PBCH or SIB data carried in the NB-PDSCH.
  • the reference signal is sent on the predefined subframe in all valid subframes and the non-predefined subframe in which the NB-IoT data transmission exists; when the terminal device receives When the NB-IoT data is transmitted by the base station (the first scenario), the reference signal is received on the time-frequency resource (the first time-frequency resource) that receives the NB-IoT data; when the terminal device performs the channel measurement or the RRM measurement (the second scenario) The reference signal is received on consecutive M designated subframes in a non-Anchor narrowband all valid subframes (the designated subframe includes a predefined subframe and a non-predefined subframe in which the public NB-IoT data transmission exists).
  • the operation mode of the NB-IoT system is In-band operation, and the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrow bands of 180 kHz), and is named as the first, second, third, and Four PRBs; wherein the first PRB is used as an Anchor narrowband, at least for transmitting NB-PSS/SSS signals and NB-PBCH data.
  • subframe 2 subframe 3 subframe 7, and subframe 8 are configured for MBMS transmission of the LTE system and subframe 9 in the Anchor narrowband.
  • the subframe ie, the effective subframe
  • the subframe that can be used for transmitting the NB-IoT data includes five, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 6
  • the subframes ie, valid subframes
  • the subframes include six, which are specifically expressed as:
  • Subframe 0 subframe 1
  • subframe 4 subframe 5
  • subframe 6 subframe 9.
  • the predefined subframes in the above 5 valid subframes include subframe 0, subframe 4, and subframe 5
  • the predefined in the above 6 valid subframes The subframe includes subframe 0, subframe 4, subframe 5, and subframe 9.
  • the transmission process of the NB-IoT reference signal is as follows:
  • For the first PRB (Anchor Narrowband), take an LTE radio frame range as an example.
  • the reference signal is always transmitted on the predefined subframe (ie, subframe 0, subframe 4, subframe 5); in addition, for subframe 1 and subframe One of the six subframes, if there is NB-IoT data transmission, transmits a reference signal on the subframe, and if there is no NB-IoT data transmission, the reference signal is not transmitted on the subframe.
  • For the second, third or fourth PRB (non-Anchor narrowband), take an LTE radio frame range as an example.
  • the reference signal is always transmitted on the predefined subframes (ie, subframe 0, subframe 4, subframe 5, and subframe 9); in addition, for the subframe 1 and one of the subframes 6, if there is NB-IoT data transmission, the reference signal is transmitted on the subframe, and if there is no NB-IoT data transmission, the reference signal is not transmitted on the subframe.
  • the NB-IoT data is data carried in the NB-PBCH or data carried in the NB-PDCCH or data carried in the NB-PDSCH. .
  • the reception process of the NB-IoT reference signal is as follows:
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies all valid subframes of the third PRB (subframe 0, subframe 1, subframe 4) , subframe 5, subframe 6 and subframe 9)
  • the terminal device receives the NB-IoT data sent by the base station (first scenario)
  • all valid subframes in the third PRB receiveive time-frequency resources of the NB-IoT data
  • the NB-IoT data sent by the base station to the terminal device in the LTE radio frame range occupies the subframe 0 and the subframe 1 of the second PRB and the subframe 4 and the subframe 5 occupied by the fourth PRB
  • Subframe 6 and subframe 9 when the terminal device receives the NB-IoT data transmitted by the base station (the first scene), the subframe 0 and the subframe 1 of the second PRB, and the subframe 4 and the subframe of the fourth PRB 5.
  • the subframe 6 and the subframe 9 (the time-frequency resource of the received data, that is, the first time-frequency resource) simultaneously receive the NB-IoT data and the reference signal, where the reference signal is used to demodulate the NB-IoT data.
  • the predefined subframes in the 6 valid subframes of the non-Anchor narrowband include subframe 0, subframe 4, subframe 5, and subframe 9 and the terminal device starts performing channel or RRM measurement at the start time of one LTE radio frame. ;
  • the terminal device receives the reference signal on consecutive M designated valid subframes in the third PRB (non-Anchor narrowband), where M is an integer greater than 0, wherein the designated valid subframe includes all valid in the third PRB a predefined subframe in the subframe and a non-predefined subframe in which the public NB-IoT data transmission exists; for example, if subframe 1 in the valid subframe is used for public NB-IoT data transmission and M is equal to 6,
  • the terminal device starts from the LTE radio frame start time, and consecutively specifies six valid subframes in the third PRB (ie, subframe 0, subframe 1, subframe 4, subframe 5, and subframe 9 of the LTE radio frame) And receiving a reference signal on a subframe 0) of the next LTE radio frame;
  • the RRM measurement includes but is not limited to RSRP measurement and RSRQ measurement.
  • the public NB-IoT The data is data carried in the NB-PBCH or system information block SIB data carried in the NB-PDSCH.
  • the base station when the operation mode of the NB-IoT system is In-band operation, the base station indicates the LTE CRS information by using the signaling, and the terminal device receives the signaling indicating the LTE CRS information, where the signaling includes at least one of the following: The MIB signaling carried in the NB-PBCH, the SIB signaling carried in the NB-PDSCH, where the SIB is one of all the SIB types supported by the NB-IoT system; wherein the LTE CRS information includes at least the following One: port number information, sequence information, precoding matrix information, power information.
  • sequence information includes:
  • the first element of the LTE CRS sequence used by the Anchor Narrowband is offset between the index in the maximum length LTE CRS sequence and the location of the non-Anchor narrowband within the LTE system bandwidth relative to the location of the Anchor narrowband within the LTE system bandwidth.
  • the LTE system bandwidth of the maximum 20 MHz includes 100 PRBs, and the length of the corresponding LTE CRS sequence is 200.
  • the LTE CRS sequence of other LTE system bandwidths is a sequence consisting of the central elements of the LTE CRS sequence of length 200, for example, the bandwidth of the 5 MHz LTE system.
  • the length of the corresponding LTE CRS sequence is 50
  • the LTE CRS sequence of length 50 is a sequence consisting of 50 elements of the center of the LTE CRS sequence of length 200.
  • the first element of the LTE CRS sequence (length 2) used by Anchor narrowband is possible index in the LTE CRS sequence of length 200, including:
  • the control overhead of 5 bits may be used to indicate the index of the first element of the Anchor narrowband LTE CRS sequence in the LTE CRS sequence of length 200.
  • the LTE CRS sequence used by the non-Anchor narrowband can be acquired according to the acquired LTE CRS sequence of the Anchor narrowband and the offset of the non-Anchor narrowband position within the LTE system bandwidth relative to the location of the Anchor narrowband within the LTE system bandwidth.
  • the sequence information may further include: an LTE system bandwidth and an index that the Anchor and the non-Anchor narrowband occupy the PRB within the bandwidth of the LTE system.
  • the LTE CRS sequence used by the Anchor narrowband or the non-Anchor narrowband depends on the index of the PRB occupied by the Anchor or the non-Anchor narrowband in the bandwidth of the LTE system, and the terminal device indirectly acquires the Anchor narrowband according to the Anchor narrowband occupying the PRB index in the LTE system bandwidth.
  • the LTE CRS sequence indirectly acquires the LTE CRS sequence used by the non-Anchor narrowband according to the index of the non-Anchor narrowband occupying the PRB within the system bandwidth.
  • the bandwidth of the PRB of the narrowband of Anchor is different in the bandwidth of the LTE system, as shown in Table 1 below, in this case, in order to enable the terminal device to acquire the bandwidth of the LTE system and the PRB of the Anchor narrowband is within the bandwidth of the system.
  • the index can use 6 bits of control overhead and jointly indicate the LTE system bandwidth and the index of the Anchor narrowband occupied PRB under the system bandwidth according to the manner shown in Table 2.
  • the terminal device is narrow based on the acquired system bandwidth and non-Anchor The index of the PRB occupied by the LTE system bandwidth can acquire the non-Anchor narrowband LTE CRS sequence.
  • the power information includes one of the following:
  • the energy (EPRE, Energy Per Resource Element) of each LTE CRS resource unit is in dBm, and the EPRE of the LTE CRS is offset from the NB-IoT reference signal EPRE.
  • the precoding matrix information is used to obtain a precoding matrix, and the obtained precoding matrix is used for one of the following:
  • the terminal device after the terminal device receives the LTE CRS information, when the terminal device receives the NB-IoT data sent by the base station to the terminal device (the first scenario), the terminal device receives the NB-IoT data.
  • the time-frequency resource the first time-frequency resource
  • the LTE CRS is also received; at this time, the NB-IoT reference signal and the LTE CRS are simultaneously used to demodulate the base station to send to the terminal device.
  • NB-IoT data On the time-frequency resource (the first time-frequency resource), in addition to receiving the NB-IoT reference signal, the LTE CRS is also received; at this time, the NB-IoT reference signal and the LTE CRS are simultaneously used to demodulate the base station to send to the terminal device.
  • the LTE CRS of the single port (port number is 0) is received, where the NB-IoT reference signal port and the LTE CRS port are the same antenna port;
  • the LTE CRS of the single port is received, wherein the NB-IoT reference signal port is the same antenna port as the port 0 of the LTE CRS; or, the two ports are received (the port number is LTE CRS of 0 and 1), wherein the two-port LTE CRS with port numbers 0 and 1 described above is virtualized as one port on the terminal device side, and the virtualized port and NB-IoT reference signal port For the same antenna port;
  • the LTE CRS with a single port is received, where the NB-IoT reference signal port is the same antenna port as the LTE CRS port 0; or, the receiving four port (number is 0) LTE CRSs of 1, 2, and 3), wherein the four-port LTE CRSs with the port numbers 0, 1, 2, and 3 are virtualized into one port on the terminal device side, and the virtualized one port The same antenna port as the NB-IoT reference signal port;
  • the LTE CRSs of the two ports are received, wherein the port 0 of the NB-IoT reference signal is the same antenna port as the port 0 of the LTE CRS, and the port 1 and the LTE CRS Port 1 is the same antenna port;
  • the LTE CRSs of the two ports are received, wherein the port 0 of the NB-IoT reference signal is the same antenna port as the port 0 of the LTE CRS, and the port 1 and the LTE CRS Port 1 is the same antenna port; or, it receives four ports (numbered 0, 1, 2, and 3) of LTE CRS, where the above-mentioned port number is 0, 1, 2, and 3 for four-port LTE CRS at the terminal
  • the device side is virtualized into two ports (numbered 0 and 1).
  • Port 0 in the virtual port is the same antenna port as NB-IoT reference signal port 0.
  • Reference signal port 1 is the same antenna port.
  • the base station when the operation mode of the NB-IoT system is In-band operation, the base station indicates the LTE CRS information by using the signaling, and the terminal device receives the signaling indicating the LTE CRS information, where the signaling includes at least one of the following: The MIB signaling carried in the NB-PBCH, the SIB signaling carried in the NB-PDSCH, where the SIB is one of all the SIB types supported by the NB-IoT system; wherein the LTE CRS information includes at least the following One: port number information, sequence information, precoding matrix information, power information.
  • the terminal device receives the LTE CRS information
  • the terminal device performs channel measurement or RRM measurement (second scenario)
  • the terminal device has consecutive M (greater than 0 integer) valid subframes in the Anchor Narrowband (No.
  • the LTE CRS is also received in the above M valid subframes; at this time, the NB-IoT reference signal and the LTE CRS are simultaneously used by the terminal device for channel measurement or RRM measurement.
  • the same reference signal sequence is used for consecutive L subframes or active subframes in an Anchor narrowband or a non-Anchor narrowband, where L is an integer greater than one.
  • subframe 0 and subframe 1 use the same reference signal.
  • Sequence when subframe 2 and subframe 3 have reference signal transmission, subframe 2 and subframe 3 use the same reference signal sequence, and when subframe 4 and subframe 5 have reference signal transmission, subframe 4 and subframe 5 use the same.
  • the reference signal sequence when subframe 6 and subframe 7 have reference signal transmission, subframe 6 and subframe 7 use the same reference signal sequence, and when subframe 8 and subframe 9 have reference signal transmission, subframe 8 and subframe 9 are used. The same reference signal sequence.
  • the effective subframes in the LTE radio frame include six, specifically including subframe 0, subframe 1, subframe 4, subframe 5, subframe 6, and subframe 9, and assumes two consecutive valid subframes (L). Equal to 2) using the same reference signal sequence, then within the LTE radio frame range, when subframe 0 and subframe 1 have reference signal transmission, subframe 0 and subframe 1 use the same reference signal sequence, when subframe 4 and sub-frame When frame 5 has a reference signal transmission, subframe 4 and subframe 5 use the same reference signal sequence, and when subframe 6 and subframe 9 have reference signal transmission, subframe 6 and subframe 9 use the same reference signal sequence.
  • the same or different reference signal sequences are used in different narrow bands (or PRBs) having the same number; wherein, the same The numbered valid subframes use different reference signal sequences, including: a valid subframe of a narrowband (Anchor or non-Anchor narrowband) uses a reference signal sequence equal to the LTE CRS sequence corresponding to the valid subframe.
  • the NB-IoT system uses four PRBs in the bandwidth range of the LTE system (as four narrowbands of 180 kHz), and is named first, second, and The third and fourth PRBs; wherein the first PRB is used as an Anchor narrowband.
  • one of the valid subframes may be based on the following: reference signal sequence is determined r l, ns (i):
  • the reference signal sequence r l, ns (i) does not depend on the index of the narrowband occupied PRB;
  • N ID cell represents a physical cell identifier (PCID)
  • n s represents a slot index
  • l represents an OFDM symbol index
  • N CP depends on a CP type, and takes a value of 0 or 1
  • c init represents a pseudo-random sequence c( ⁇ ) Initialization value.
  • the reference signal sequence used by one of the four PRBs is equal to the LTE CRS sequence corresponding to the valid subframe, that is, the reference signal is transmitted in the valid subframe.
  • the reference signal sequence corresponding to one OFDM symbol is equal to the LTE CRS sequence corresponding to the OFDM symbol in the subframe; for example, it is assumed that within one valid subframe of one PRB of the foregoing four PRBs, the reference signal occupies each of the valid subframes
  • the last two OFDM symbols of the time slot are exemplified by a normal CP. As shown in FIG.
  • the OFDM symbol for transmitting the reference signal is the sixth, seventh, thirteenth, and fourteenth OFDM symbols in all OFDM symbols.
  • the corresponding reference signal sequence is equal to the LTE CRS sequence corresponding to the sixth OFDM symbol
  • the corresponding reference signal sequence is equal to the seventh OFDM symbol.
  • the LTE CRS sequence, for the 13th OFDM symbol, the corresponding reference signal sequence is equal to the LTE CRS sequence corresponding to the 13th OFDM symbol
  • the corresponding reference signal sequence is equal to LTE CRS sequence of 14 OFDM symbols corresponding.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a device for transmitting a reference signal is also provided in the embodiment, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 4 is a structural block diagram of a device for transmitting a reference signal according to an embodiment of the present invention. As shown in FIG. 4, the device includes:
  • the obtaining module 42 is configured to acquire a reference signal
  • the sending module 44 is connected to the obtaining module 42 and configured to send a reference signal in one of the following manners: one of the narrowbands used by the system: transmitting the reference signal on all valid subframes; in all valid subframes Non-multicast broadcast single frequency network MBSFN subframes and MBSFN subframes with data transmissions transmit reference signals; reference signals are transmitted on subframes where data transmission exists in all valid subframes; predefined in all valid subframes The reference signal is transmitted on the subframe and the non-predefined subframe in which the data transmission exists; wherein the valid subframe is a subframe having the capability of transmitting system data.
  • the foregoing apparatus may include the obtaining module 42 and the sending module 44, and may only include the sending module 44, and is not limited thereto.
  • the above device can be applied to a base station, but is not limited thereto.
  • the manner of transmitting the reference signal is provided, that is, the manner of transmitting the NB-RS is provided, and the problem of how to transmit the NB-RS in the case where the NB-IoT system uses multiple narrowbands simultaneously is solved in the related art.
  • the transmission of the NB-RS in the above manner avoids that the reference signal is always transmitted on all subframes, thereby avoiding the interference of the NB-IoT system in the in-band In-band operation mode to the LTE system, and also solving the problem in the band. How to reduce the interference of the NB-IoT system to the LTE system in the inner In-band mode of operation.
  • FIG. 5 is a structural block diagram of a receiving device for a reference signal according to an embodiment of the present invention. As shown in FIG. 5, the device may include:
  • the first receiving module 52 is configured to receive the reference signal on the first time-frequency resource or receive the reference signal and the long-term evolution LTE cell-specific reference signal CRS on the first time-frequency resource, where the data is received;
  • the first time-frequency resource is a time-frequency resource occupied by the received data;
  • the second receiving module 54 is configured to receive at least one of the following: a reference signal, an LTE CRS, on the second time-frequency resource, where the channel measurement or the radio resource management RRM measurement is performed; where the second time-frequency resource is the following One of: M subframes located in a primary narrowband or non-primary narrowband, located in M subframes of X different narrowbands; where M is an integer greater than 0, and X is an integer greater than one;
  • the parsing module 56 is connected to the first receiving module 52 and/or the second receiving module 54 to be configured to demodulate the received data by using the received reference signal and/or LTE CRS, or perform channel measurement or RRM measurement. .
  • the foregoing first receiving module 52 and the second receiving module 54 may be completed by one processor, or may be separately performed by one processor, but are not limited thereto.
  • the above device may not solve the technical problem without including the above-mentioned parsing module 56.
  • the above device may be located in the terminal, but is not limited thereto.
  • a transmission system of a reference signal comprising: a base station including the transmitting apparatus of the embodiment shown in Fig. 4 described above and a terminal of the receiving apparatus of the embodiment shown in Fig. 5.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are respectively located. Among multiple processors.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the reference signal is sent in one of the following ways: transmitting the reference signal on all valid subframes; the non-multicast broadcast single frequency network MBSFN subframes in all valid subframes A reference signal is transmitted on an MBSFN subframe in which data transmission exists; a reference signal is transmitted on a subframe in which all data is transmitted in all valid subframes; a predefined subframe in all valid subframes and a non-predefined child in which data transmission exists The reference signal is transmitted on the frame; wherein the valid subframe is a subframe having the capability of transmitting NB-IoT data.
  • the foregoing storage medium may include, but is not limited to, a U disk, a read only memory (ROM, Read-Only Memory), Random Access Memory (RAM), removable hard disk, disk or optical disk, etc., which can store program code.
  • ROM read only memory
  • RAM Random Access Memory
  • removable hard disk disk or optical disk, etc., which can store program code.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the reference signal is sent in one of the following manners: the reference signal is transmitted on all valid subframes; the non-group in all valid subframes Broadcasting a single frequency network MBSFN subframe and transmitting a reference signal on an MBSFN subframe in which data transmission exists; transmitting a reference signal on a subframe in which all data transmission is present in a valid subframe; a predefined subframe in all valid subframes
  • the method of transmitting the reference signal on the non-predefined subframe in which the data transmission exists has solved the problem of how to transmit the NB-RS in the case where the NB-IoT system uses multiple narrowbands simultaneously.

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

Abstract

La présente invention concerne un procédé et un dispositif pour émettre et recevoir un signal de référence, ainsi qu'un système d'émission. Le procédé d'émission comprend les étapes suivantes : pour une bande étroite parmi toutes les bandes étroites utilisées par un système, émettre un signal de référence dans l'un des modes suivants : émettre le signal de référence sur toutes les sous-trames effectives ; émettre le signal de référence sur des sous-trames non de réseau monofréquence de multidiffusion/diffusion (MBSFN), et des sous-trames de MBSFN de transmission de données des sous-trames effectives ; émettre le signal de référence sur des sous-trames de transmission de données des sous-trames effectives ; et émettre le signal de référence sur une sous-trame prédéterminée et des sous-trames non de transmission de données prédéterminées des sous-trames effectives, les sous-trames effectives étant des sous-trames capables de transmettre des données de système. La présente invention traite le problème dans l'état de la technique associé de la façon d'émettre un NB-RS dans un scénario dans lequel un système NB-IoT utilise de multiples bandes étroites simultanément.
PCT/CN2017/072858 2016-02-05 2017-02-03 Procédé et dispositif pour émettre et recevoir un signal de référence, et système d'émission WO2017133676A1 (fr)

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