WO2017152407A1 - Procédé et appareil destinés à générer un signal de référence - Google Patents

Procédé et appareil destinés à générer un signal de référence Download PDF

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Publication number
WO2017152407A1
WO2017152407A1 PCT/CN2016/076052 CN2016076052W WO2017152407A1 WO 2017152407 A1 WO2017152407 A1 WO 2017152407A1 CN 2016076052 W CN2016076052 W CN 2016076052W WO 2017152407 A1 WO2017152407 A1 WO 2017152407A1
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Prior art keywords
sequence
reference signal
time slot
slot number
initial value
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PCT/CN2016/076052
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English (en)
Chinese (zh)
Inventor
刘劲楠
李强
冯淑兰
吴毅凌
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华为技术有限公司
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Priority to PCT/CN2016/076052 priority Critical patent/WO2017152407A1/fr
Priority to CN201680056622.3A priority patent/CN108141427A/zh
Publication of WO2017152407A1 publication Critical patent/WO2017152407A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to the field of communications, and in particular, to a reference signal generating method and apparatus.
  • an Internet of Things (English: Narrow band-Internet of Thing) is defined to define a downlink bandwidth of only 600 kHz.
  • NB-IoT Internet of Things
  • OFDM Chogonal Frequency Division Multiplexing, English
  • NB-IoT downlink reference signal NB-RS (Chinese: Narrow band-Reference signal) also follows CRS (Chinese: Long Term Evolution, English: Long Term Evolution) : Cell-specific reference signal, English: Cell specific Reference signal).
  • CRS Choinese: Long Term Evolution, English: Long Term Evolution
  • Cell-specific reference signal English: Cell specific Reference signal
  • Step 1 Reference signal sequence generation
  • the reference signal sequence is generated by the Gold sequence and mapped to a QPSK signal, wherein the initial value of the second sequence is identified by the physical layer cell
  • the number of slots in a frame is n s , and the number of OFDM symbols in a slot is 1, and the Ncp type is determined.
  • n s is the slot number in a frame
  • l represents the symbol number in a slot
  • the value range is N CP is 0, 1 indicates two cyclic prefix types of OFDM symbols, respectively. Indicates the physical layer cell ID.
  • Step 2 The sequence mapping time-frequency resource corresponds to a resource element (English: Resource Element, RE for short) in the first OFDM in the n s time slot.
  • the unit of the time-frequency resource in the NB-IoT, and the unit of the time-frequency resource in the LTE is also divided into resource blocks, that is, each RB (Chinese: Resource Block, English: Resource Block) is divided into 12 subcarriers on the frequency, each sub-subcarrier.
  • the carrier is a 15KHz, time domain 6 or 7 grid of OFDM symbols, each grid, called a resource unit, and each RE can be used to transmit a reference signal.
  • Each RE location can be determined by the subcarrier sequence number k and the symbol sequence number 1 in one slot, as shown in FIG.
  • the initial value of the reference sequence is directly related to the symbol sequence number 1 in one slot, that is, the reference sequence on each OFDM symbol is different, which increases the complexity of the terminal in processing the NB-RS.
  • the present invention provides a reference signal generating method and apparatus for simplifying the complexity of demodulation of a terminal by using a reference signal.
  • a method for generating a reference signal is provided in the embodiment of the present invention, where the method includes:
  • the specific one may be:
  • the second sequence can be mapped to a reference signal sequence of complex modulation symbols.
  • the reference signal sequence may be mapped to a resource unit where the reference signal in the plurality of time slot packets is located, and transmitted through the antenna port.
  • the resource unit in which the reference signal sequence is mapped to the reference signal in the plurality of OFDM symbol packets in the time slot corresponding to the time slot number may be mapped and transmitted through the antenna port.
  • Determining the Gold sequence according to the initial value of the second sequence and the initial value of the first sequence may specifically include determining the Gold sequence and discarding the Gold sequence according to the initial value of the second sequence and the initial value of the first sequence. Initially generating N c-NB values, where N c-NB , 0 ⁇ N c-NB ⁇ 1024, discards the initial generation of N c-NB values of the Gold sequence during the determination of the Gold sequence.
  • the length of the reference signal sequence or the reference signal sequence is greater than or equal to a plurality of time slot packets within a value range of the time slot number, or a time slot corresponding to the time slot number The number of resource elements in which the reference signals on the plurality of OFDM symbols within the plurality of orthogonal frequency division multiplexed symbol packets are located.
  • the resource unit includes all OFDM symbols occupying one slot in time, occupying two subcarriers on the frequency and spacing the two subcarriers by 5 subcarriers.
  • the value of the slot number is in the range of one or more frames, where the frame may be an M subframe, and the slot number may be in the range of one slot or one M in the M subframe.
  • the mapping of the reference signal sequence to a resource unit in which the reference signal is located in the plurality of time slot packets, and transmitting or mapping the reference signal sequence to the time slot through an antenna port includes:
  • the frequency division sub-multiplexed symbol group is on a resource unit on which a reference signal on a plurality of OFDM symbols is located.
  • an embodiment of the present invention provides a reference signal generating apparatus having a function of implementing a reference signal generating behavior in the above first aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the reference signal generating device includes a processor and a memory for storing a program supporting the reference signal generating device to perform the above method, the processor being configured to execute the memory Stored in the program.
  • the reference signal generating device may also include a communication interface for the data processing device to communicate with other devices or communication networks.
  • an embodiment of the present invention provides a computer storage medium for storing computer software instructions for use in the data processing apparatus, including a program designed to perform the above-described aspect as a reference signal generating apparatus.
  • the reference signal generating method and apparatus determines a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, and maps the second sequence to a reference signal sequence of the complex modulation symbol, or according to the first
  • the initial value of the sequence and the generator polynomial of the first sequence determine a first sequence, determine a Gold sequence according to the modulo 2 operation result of the first sequence and the second sequence, and map the Gold sequence to a reference signal of a complex modulation symbol
  • the sequence uses the same initial value or multiple reference symbols in multiple time slots to use the same initial value by using multiple reference symbols in one time slot, simplifying the complexity of demodulating the terminal by using the reference signal, and increasing the reference signal. Randomization characteristics.
  • FIG. 1 is a schematic diagram of a reference symbol pattern of LTE in the prior art, in which a vertical axis is a frequency and a horizontal axis is a time;
  • FIG. 2 is a flow chart of an embodiment of a reference signal generating method in an embodiment of the present invention
  • FIG. 3 is a flow chart of another embodiment of a reference signal generating method in an embodiment of the present invention.
  • Fig. 4 is a structural diagram showing an embodiment of a reference signal generating apparatus in the embodiment of the present invention.
  • NB-IoT (Chinese: Narrow band Internet of Thing) is a method in time-frequency resource division multiplexing LTE (English: Long term evolution).
  • the unit of the time-frequency resource in the NB-IoT is also the unit of the time-frequency resource in the LTE is the resource block division, that is, each RB (Chinese: Resource Block, English: Resource Block) is divided into 12 subcarriers on the frequency, time domain 6 or A grid of 7 OFDM symbols, each of which is called a resource element (English: Resource Element, RE for short).
  • Each RE can be used to transmit reference signals or data or blanks. When blank, it is not used for any transmission.
  • a new frame structure is defined in -IoT, and every 6 LTE subframes constitute one M subframe, and every 10 M subframes constitute one M frame.
  • the initial value of the reference sequence is related to the number of OFDM symbols in one slot, a reference sequence will be generated on each OFDM symbol, so that the terminal generates a reference signal with high complexity and needs to be generated. After the initial 1600 values, it can be used, which also leads to the complexity of the reference signal sequence generated by the terminal. Can not meet the design requirements of low-cost NB-IoT.
  • an embodiment of a reference signal generating method in an embodiment of the present invention includes:
  • S201 Determine a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, where the initial value of the second sequence is determined by a physical layer cell identifier, a slot number, and a grouping parameter, where the grouping
  • the parameter is a constant indicating a plurality of time slot packets within a range of values of the time slot number or a plurality of orthogonal frequency division multiplexing OFDM symbol packets within a time slot corresponding to the time slot number.
  • the first implementation manner using multiple time slot groups within the range of slot number values
  • the method of initial values of the second sequence may be expressed as
  • u1 represents the number of bits corresponding to the initial value in the second sequence
  • the range of values is determined, ie It is a slot number within one M subframe or a slot number within one M frame or a slot number within one frame.
  • one M frame includes 10 M subframes, and every 6 subframes in LTE constitute one M subframe.
  • the corresponding range of values can have different definitions among them Yes The number of elements in the corresponding range of values.
  • Range of values different The range of values can also be changed Ranges, Represents a rounding down operation, ie When the sequence number aN gslot is between (a+1)N gslot -1, The values obtained are all the same for a, where a is the integer 0, 1, .... Make through Calculated c init is the same, will There are multiple time slots in the range of values, and each N gslot time slot is divided into one group, and each group adopts the same initial value. Can be understood as passing will A plurality of slots within a range of values is divided into groups, each group comprising N gslot slots.
  • N gslot 1
  • the slot number All OFDM symbols in one slot in the range of values are a group
  • the real-time domain is 6 or 7 OFDM symbols. Operation is equivalent to That is, the grouping parameters are not displayed.
  • the second implementation manner using multiple orthogonal frequency division multiplexing OFDM symbol groupings in one slot number
  • N gsym is a grouping parameter, passed The operation of taking N gsym OFDM symbols in one slot as a group. That is, when the value of l NB is between bN gsym and (b+1)N gsym -1, The value is b. N gsym can take 1, 2, etc. Indicates that the number of symbols in a time slot is passed. Operation, will The OFDM symbols are divided into groups.
  • u3 is based on The range of values is determined, ie It is a slot number within one M subframe or a slot number within one M frame or a slot number within one frame.
  • the reference signal sequence on multiple OFDM symbols in each group may have only one initial value of the second sequence.
  • x 2 (n + 31) (x 2 (n + 3) + x 2 (n)) mod2
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n)) mod2
  • the generator polynomial of the second sequence can reuse the generator polynomials of the two m sequences defined in LTE.
  • the generator polynomial form of the two sequences those skilled in the art should understand that here Do not repeat them.
  • the generator polynomial according to the second sequence determines the second sequence, and the second sequence is mapped to obtain a reference signal sequence.
  • the common mappings are BPSK, ⁇ /2-BPSK, QPSK, etc., and are not particularly limited herein.
  • Determining the second sequence to determine the first sequence Determining the second sequence to determine the first sequence.
  • BPSK Binary Phase Shift Keying
  • N grs represents the number of sets of reference signals in one slot, for example, 1, 2 groups.
  • the reference signal generating method provided by the present invention uses the same initial value or multiple reference symbols in multiple time slots to use the same initial value by using multiple reference symbols in one time slot, so that the terminal is demodulated by using the reference signal.
  • the complexity increases the randomization characteristics of the reference signal.
  • the embodiment of the present invention further provides a reference signal generation method.
  • the methods include:
  • S301 Determine a second sequence according to an initial value of the second sequence and a generator polynomial according to the second sequence.
  • the initial value of the second sequence is determined by a physical layer cell identifier, a slot number, and a grouping parameter, where the grouping parameter is a constant, indicating that multiple time slots are grouped within the range of the slot number. Or a plurality of orthogonal frequency division multiplexing OFDM symbol packets within one slot number.
  • S302. Determine a first sequence according to an initial value of the first sequence and a generator polynomial of the first sequence.
  • step S301 and step S302 may be reversed, that is, the first sequence may be determined first, and then the second sequence may be determined, which is not limited thereto.
  • the Gold sequence is obtained by two m sequences, a first sequence x 1 (n), and a second sequence x2(n) modulo 2:
  • N C-NB represents the sequence length of the initial drop, 0 ⁇ N C-NB ⁇ 1024, wherein the value of N C-NB may be a fixed value of (0, 32, 64, 128, 256, 512, 1024)
  • mappings include BPSK, ⁇ /2-BPSK, QPSK, etc., and no special restrictions are made here.
  • BPSK Binary Phase Shift Keying
  • N grs represents the number of sets of reference signals in one slot, for example, 1, 2 groups.
  • S305 Map the reference signal sequence to a resource unit where the reference signal in the multiple time slot group is located, and transmit the data through the antenna port, or map the reference signal sequence to a time slot corresponding to the time slot number.
  • the reference signal sequence is mapped to the corresponding On the kth resource unit of the lth OFDM symbol within the slot number. Since a plurality of OFDM shares a reference signal sequence initial value, then r 1 (m) needs to be mapped onto a resource unit on which a reference signal on a plurality of OFDM symbols within the packet is located.
  • the reference signal sequence needs to be mapped to the resource unit where the reference signal on the plurality of OFDM symbols in the packet is located, and may be sequentially padded in priority time, that is, the reference signal is determined for each OFDM when the parameter between the subcarrier position and the sequence m is determined.
  • the number is modulo.
  • the resource unit on which the reference signal sequence needs to be mapped to the reference signal on the plurality of OFDM symbols in the packet may also be sequentially padded on the priority frequency, that is, when the position of the subcarrier position k and the parameter of the m are determined.
  • the number of reference signals on the same subcarrier in the packet is modulo.
  • the resulting offset, and the position of the reference signal on the time symbol can follow the density of the CRS in LTE, and the reference signal for the antenna port 0, 1 takes up 0 in time. Or use more position l, a preferred way to adopt All the symbols in it, that is, occupied
  • v or v shift adopts a different offset from LTE.
  • a simple method is that v is caused by the offset of antenna port p and LTE uses orthogonal resources.
  • the length of the reference signal sequence or the reference signal sequence is greater than or equal to the number of resource elements on a plurality of OFDM symbols of an antenna port in one or more of the packets.
  • the resource unit includes:
  • All OFDM symbols in one slot are occupied in time, occupying two subcarriers in frequency and spacing 5 subcarriers in two subcarriers.
  • the embodiment of the present invention further provides a reference signal generating device, which is used to execute the foregoing FIG. Method, the device comprises:
  • the processing module 401 is configured to determine a second sequence according to an initial value of the second sequence and a generator polynomial of the second sequence, where the initial value of the second sequence is determined by a physical layer cell identifier, a slot number, and a grouping parameter, where And the grouping parameter is a constant, indicating a plurality of time slot groups within a value range of the time slot number or a plurality of orthogonal frequency division multiplexing OFDM symbol groups in a time slot corresponding to the time slot number ;
  • the processing module 401 is configured to map the determined second sequence to a parameter of a complex modulation symbol Determining the first sequence according to the initial value of the first sequence and the generator polynomial of the first sequence, determining the Gold sequence according to the modulo 2 operation result of the first sequence and the second sequence, and mapping the Gold sequence A reference signal sequence that is a complex modulation symbol.
  • the device is a base station or a terminal device.
  • the transmitting, by the base station, the downlink reference signal includes generating a random sequence, mapping the random sequence into a reference signal sequence of the complex modulation symbol, and mapping the reference signal sequence to the antenna, on the time-frequency resource in the subframe number slot.
  • Terminal device side
  • the terminal receives the synchronization channel to obtain the physical layer cell identifier, obtains the frame number by receiving the synchronization channel and the PBCH (Chinese: Physical Broadcast CHannel) channel, and determines the corresponding subframe number.
  • the terminal generates a random sequence according to the physical layer cell identifier and the subframe number, and maps the random sequence into a reference signal sequence of the complex modulation symbol.
  • the terminal receives the OFDM symbol in the corresponding subframe number, and obtains the received reference signal sequence on the plurality of OFDM symbols in the subframe by using the inverse mapping.
  • the channel measurement, channel estimation and data demodulation are obtained by performing special operations on the generated reference signal sequence and the received reference signal sequence.
  • the processing module is further configured to: map the obtained reference signal sequence to a resource unit where the reference signal in the multiple time slot group is located, and transmit the data through the antenna port; or And the obtained reference signal sequence is mapped to a resource unit in which the reference signal in the plurality of OFDM symbol packets in the time slot corresponding to the time slot number is located, and is transmitted through the antenna port.
  • the device further includes: a sending module 402, configured to transmit, by using an antenna port, a reference signal processed by the processing module.
  • processing module 401 is further configured to:
  • N c-NB 0 ⁇ N c-NB ⁇ 1024 .
  • the length of the reference signal sequence or the reference signal sequence is greater than or equal to a plurality of time slot packets within a value range of the time slot number, or multiple positive time slots in the time slot corresponding to the time slot number The number of resource elements in which the reference signals on the plurality of OFDM symbols within the frequency division multiplexed symbol group are located.
  • the resource unit includes:
  • All OFDM symbols in one slot are occupied in time, occupying two subcarriers on the frequency and two The subcarriers are separated by 5 subcarriers.
  • the slot number ranges from a slot number in one or more frames
  • the frame may be one M subframe, and each of the six LTE subframes constitute one M subframe, for every 10 subframes.
  • M subframes form an M frame.
  • processing module 401 is further configured to:
  • the frequency division sub-multiplexed symbol group is on a resource unit on which a reference signal on a plurality of OFDM symbols is located.
  • the grouping parameter is 1, and the plurality of OFDM symbols in one slot in the slot number range is a group.
  • the physical device corresponding to the processing module 401 in the embodiment of the device may be a processor, and the physical device corresponding to the sending module 402 may be a transmitter.
  • the invention can be widely applied to a wireless communication system, and is particularly suitable for an Internet of Things system, such as smart meter reading, logistics monitoring, etc., which simplifies the complexity of demodulation of a terminal by using a reference signal, and increases the random characteristics of the sequence.
  • an Internet of Things system such as smart meter reading, logistics monitoring, etc.
  • the reference signal generating apparatus uses the same initial value or multiple reference symbols in multiple time slots to use the same initial value by using multiple reference symbols in one slot, simplifying the terminal to demodulate by using the reference signal.
  • the complexity increases the randomization characteristics of the reference signal.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Read Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.
  • ROM Read Only Memory
  • RAM Random Access Memory

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Abstract

L'invention concerne un procédé et un appareil destinés à générer un signal de référence. Le procédé selon l'invention consiste : à déterminer une deuxième séquence en fonction d'une valeur initiale de la deuxième séquence et d'un polynôme générateur de la deuxième séquence ; et à mettre en correspondance la deuxième séquence avec une séquence de signaux de référence avec un symbole de modulation complexe ; ou à déterminer une première séquence en fonction d'une valeur initiale de la première séquence et d'un polynôme générateur de la première séquence ; à déterminer une séquence en or selon un résultat d'opération de mode 2 de la première et de la deuxième séquence ; et à mettre en correspondance la séquence en or avec une séquence de signaux de référence avec un symbole de modulation complexe. Une pluralité de symboles de référence dans un créneau temporel utilisent la même valeur initiale ou une pluralité de symboles de référence dans une pluralité de crénaux temporels utilisent la même valeur initiale, ce qui réduit la complexité lorsqu'un terminal utilise un signal de référence pour effectuer une démodulation, et améliore la caractéristique de randomisation d'un signal de référence.
PCT/CN2016/076052 2016-03-10 2016-03-10 Procédé et appareil destinés à générer un signal de référence WO2017152407A1 (fr)

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WO2022141579A1 (fr) * 2020-12-31 2022-07-07 华为技术有限公司 Procédé et appareil de détermination d'une séquence de signaux de référence

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CN113542178A (zh) 2019-04-28 2021-10-22 华为技术有限公司 生成参考信号的方法、检测参考信号的方法和通信装置
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