WO2018141273A1 - 通信方法和设备 - Google Patents

通信方法和设备 Download PDF

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Publication number
WO2018141273A1
WO2018141273A1 PCT/CN2018/075146 CN2018075146W WO2018141273A1 WO 2018141273 A1 WO2018141273 A1 WO 2018141273A1 CN 2018075146 W CN2018075146 W CN 2018075146W WO 2018141273 A1 WO2018141273 A1 WO 2018141273A1
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Prior art keywords
synchronization signal
subcarriers
pci
communication method
group
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PCT/CN2018/075146
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English (en)
French (fr)
Inventor
尤肖虎
汪茂
张军
刘亚林
胡亨捷
邹骏
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华为技术有限公司
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Publication of WO2018141273A1 publication Critical patent/WO2018141273A1/zh
Priority to US16/530,460 priority Critical patent/US11026197B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0056—Inter-base station aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2688—Resistance to perturbation, e.g. noise, interference or fading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group

Definitions

  • the present application relates to the field of communications and, more particularly, to communication methods and apparatus.
  • the basic functions of the smart grid are distribution automation, power data collection automation, monitoring of key nodes of the grid, and real-time feedback of data to prevent accidents (such as major power outages).
  • the power grid will subvert the current pattern of power supply only in power plants. Each household may generate electricity and transmit it to each other as needed to achieve flexible distribution and transfer of electrical energy.
  • This new type of transmission structure relies more on the full information interaction between the nodes of the grid. Since the smart grid relies on sufficient power system information interaction between the nodes of the power grid, the power system information interaction becomes the key technology of the smart grid.
  • Establishing a power private network based on a wireless communication system means that the power company builds its own base station and builds a wireless network dedicated to itself.
  • a power private network established based on a wireless communication system is called a power wireless private network or a power wireless communication system.
  • the embodiment of the present application provides a communication method and device, which can support a power wireless communication system and implement information interaction in a power wireless communication system.
  • a communication method comprising: a first device determining a first synchronization signal, the first synchronization signal being used by a second device for symbol timing alignment and frequency synchronization; and the first device in the M group
  • the first synchronization signal is transmitted on each group of subcarriers, and M is a positive integer greater than or equal to 2.
  • the first device transmits the first synchronization signal on each of the plurality of groups of subcarriers, so that the second device can select an appropriate bandwidth for receiving the first synchronization signal according to its own receiving capability. .
  • the first device sends the plurality of first synchronization signals to the second device by using the multiple groups of subcarriers, which can provide interference diversity and frequency domain diversity, and improve transmission reliability of the first synchronization signal.
  • each group of subcarriers may be consecutive multiple subcarriers, or may be multiple subcarriers that are not consecutive.
  • each group of subcarriers may be consecutive 12 subcarriers included in one Resource Block (RB) in the power wireless communication system.
  • RB Resource Block
  • the first device sends the first synchronization signal on each group of subcarriers of the M group of subcarriers, including: the first device is in the The first synchronization signal is sent to each of the M subcarriers to the devices in all the cells served by the first device, and the devices in all the cells include the second device.
  • the first device sends a first synchronization signal to the second device by using a single frequency network (SFN) technology, which can avoid interference of the neighboring cell to the first synchronization signal of the local cell.
  • SFN single frequency network
  • the determining, by the first device, the first synchronization signal the first device determining, by the first device, the first complete sequence of length L
  • the first complete sequence is a Zadoff-Chu (ZC) sequence.
  • ZC Zadoff-Chu
  • the second device needs to perform segmentation correlation processing on the first synchronization signal, the related advantages of the first complete sequence can be maintained.
  • the method before the first device sends the first synchronization signal on each group of subcarriers of the M group of subcarriers, The method further includes: the first device performs pre-coding processing on the first synchronization signal to obtain a pre-coded first synchronization signal, where the pre-coding matrices used by the N OFDM symbols are not identical.
  • the first synchronization signal Since the first synchronization signal is pre-coded, spatial diversity can be acquired in the process of transmission, and the performance of the first synchronization signal against fading is improved.
  • the method further includes: the first device determines a second synchronization signal, and the second synchronization signal is used in the second The device performs frame timing alignment; the first device sends the second synchronization signal on each of the K groups of subcarriers, and K is a positive integer greater than or equal to 2.
  • the first device sends the second synchronization signal to the second device on each of the plurality of groups of subcarriers, which can provide frequency domain diversity and interference diversity, and improve transmission reliability of the second synchronization signal.
  • each of the K sets of subcarriers includes 12 active subcarriers in the power wireless communication system, and the value of K is 40. That is, the first device can transmit the second synchronization signal to the second device at 40 power-specific frequency points in the power system. Thereby, high-precision timing of the second device can be achieved.
  • the second synchronization signal is used to indicate a physical cell identifier PCI of a current cell.
  • the second synchronization signal includes a first PCI information and a second PCI information, where the first PCI information is used to indicate the first value.
  • the second PCI information is used to indicate the second value
  • the method further includes: the first device determining, according to the preset value combination rule and the PCI of the current cell, the first PCI information and the first Two PCI information.
  • the determining, by the first device, the second synchronization signal that: the first device determines n second complete sequences of length l
  • n is the number of OFDM symbols included in the time domain resource used by the first device to send the second synchronization signal
  • l is a prime number less than or equal to the number of subcarriers in each group of subcarriers
  • the second complete sequence is a Zadoff-Chu (ZC) sequence.
  • ZC Zadoff-Chu
  • the second device needs to perform segmentation correlation processing on the second synchronization signal, the related advantages of the second complete sequence can be maintained.
  • the method before the first device sends the second synchronization signal on each of the K groups of subcarriers, The method further includes: the first device performing precoding processing on the second synchronization signal to obtain a second synchronization signal after precoding processing, wherein a precoding matrix used by the OFDM symbol included in the second synchronization signal Not exactly the same.
  • the anti-fading capability of the second synchronization signal can be improved, and the reliability of the second synchronization signal transmission can be improved.
  • the method before the first device sends the second synchronization signal on each of the K groups of subcarriers, the method further includes: the first device scrambling the second synchronization signal to obtain a second synchronization signal after the scrambling process.
  • the Peak to Average Power Ratio (PAPR) of the second synchronization signal can be reduced, and the anti-interference performance can be improved.
  • PAPR Peak to Average Power Ratio
  • the method further includes: determining, by the first device, a broadcast signal, where the first device is in each of the P groups of subcarriers The broadcast signal is transmitted on a group of subcarriers, and P is a positive integer greater than or equal to 2.
  • the first device sends a broadcast signal to the second device on each of the plurality of groups of subcarriers, which can provide interference diversity and frequency domain diversity, and improve transmission reliability of the broadcast signal.
  • the transmission resource used by the first device to send the broadcast signal and the transmission resource used to send the first synchronization signal include the same frequency domain resource in the frequency domain.
  • a communication method including: determining, by the second device, m groups of subcarriers for receiving a first synchronization signal sent by the first device, the first synchronization signal For the second device to perform symbol timing alignment and frequency synchronization, M is a positive integer greater than or equal to 2, m is a positive integer less than M; and each device of the second device in the m group of subcarriers The first synchronization signal is received on a subcarrier.
  • the second device selects a subcarrier for receiving the first synchronization signal from among a plurality of sets of subcarriers used by the first device to transmit the first synchronization signal.
  • the second device can receive the first synchronization signal over a narrower bandwidth, avoiding the influence of time drift on the first synchronization signal, and can support devices having only narrowband reception capability.
  • the M group subcarrier is used by the first device to send the first device to a device in all cells served by the first device a subcarrier of a synchronization signal, the device in all cells including the second device.
  • the first synchronization signal is a combination of N orthogonal frequency division multiplexing OFDM symbols, the N OFDM symbols
  • the i-th OFDM symbol is generated by the first device according to the first complete sequence of the i-th length L, and the value of N is used by the first device to send the first synchronization signal.
  • the first synchronization signal is pre-coded by the first device, where the first synchronization signal includes The precoding matrix employed by the OFDM symbols is not identical.
  • the method further includes The second device receives a second synchronization signal sent by the first device on each of the K groups of subcarriers, where K is a positive integer greater than or equal to 2.
  • the second device receives the second synchronization signal on the plurality of groups of subcarriers, so that the second device can obtain a high-precision timing effect according to phase information of different subcarriers (available subcarriers).
  • the K group subcarrier includes the m group subcarriers, where the second device is in each of the K group subcarriers Receiving, by the group of subcarriers, the second synchronization signal sent by the first device, where the second device receives the second, sent by the first device, on each group of subcarriers of the m group of subcarriers Synchronization signal.
  • the second device can receive the second synchronization signal only on the subcarriers for receiving the first synchronization signal, and can support devices having only the narrowband reception function.
  • the second synchronization signal is used to indicate a physical cell identifier PCI of a current cell
  • the method further includes: the second device according to the second The second synchronization signal determines a PCI of the current cell.
  • the second synchronization signal includes a first PCI information and a second PCI information, where the first PCI information is used to indicate the first value.
  • the second PCI information is used to indicate a second value;
  • the determining, by the second device, the PCI of the current cell according to the second synchronization signal that: the second device determines, according to a preset value combination rule, the first value, and the second value, The PCI of the current cell.
  • the second synchronization signal is a combination of n OFDM symbols, and the jth OFDM of the n OFDM symbols
  • the symbol is generated by the first device according to the jth second complete sequence of length l
  • the value of n is the OFDM symbol included in the time domain resource used by the first device to send the second synchronization signal.
  • the second synchronization signal is pre-coded by the first device, where the second synchronization signal includes The precoding matrices used in OFDM symbols are not identical.
  • the second synchronization signal is scrambled by the first device.
  • the method further includes: The two devices receive a broadcast signal on each of the P sets of subcarriers, and P is a positive integer greater than or equal to 2.
  • the P group subcarriers include the m group subcarriers, where the second device is in a P group subcarrier.
  • Receiving a broadcast signal on each group of subcarriers includes: the second device receiving the broadcast signal on the m group of subcarriers.
  • the second device can receive the second synchronization signal only on the subcarriers for receiving the first synchronization signal, and can support devices having only the narrowband reception function.
  • an apparatus for performing the method of any of the above first aspect or any of the possible implementations of the first aspect.
  • the device comprises functional modules for performing the method of any of the first aspect or the first aspect of the first aspect described above.
  • an apparatus for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect.
  • the apparatus comprises functional modules for performing the method of any of the possible implementations of the second aspect or the second aspect described above.
  • an apparatus comprising a processor, a memory, and a transceiver.
  • the processor, the memory, and the transceiver communicate with each other through an internal connection path, transmitting control and/or data signals, such that the device performs the first aspect or any of the possible implementations of the first aspect Methods.
  • an apparatus comprising a processor, a memory, and a transceiver.
  • the processor, the memory, and the transceiver communicate with each other through an internal connection path, transmitting control and/or data signals, such that the device performs any of the second or second aspects of the foregoing possible implementations.
  • a computer readable medium for storing a computer program, the computer program comprising instructions for performing the first aspect or any of the possible implementations of the first aspect.
  • a computer readable medium for storing a computer program, the computer program comprising instructions for performing any of the possible implementations of the second or second aspect described above.
  • FIG. 1 is a schematic diagram of spectrum transmission resources in a power wireless communication system according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a basic transmission unit in a power wireless communication system according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of time domain resources according to an embodiment of the present application.
  • FIG. 5 is another schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 6 is still another schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a communication method corresponding to the communication method described in FIG. 7;
  • FIG. 9 is a schematic block diagram of an apparatus in accordance with an embodiment of the present application.
  • FIG. 10 is a schematic block diagram of a device according to another embodiment of the present application.
  • FIG. 11 is a schematic block diagram of an apparatus according to still another embodiment of the present application.
  • FIG. 12 is a schematic block diagram of an apparatus according to still another embodiment of the present application.
  • the communication method of the embodiment of the present application can be applied to an Internet of Things system, including but not limited to a power wireless communication system. Since some devices require large-scale deployment in IoT systems, these devices typically choose a lower cost narrowband transceiver. Therefore, the traditional wireless communication mechanism cannot be used to realize information interaction in the system.
  • the present application proposes a communication method and device, which can support multiple communication systems and implement information interaction.
  • the power wireless communication system is taken as an example for the convenience of description, and the scope of protection of the present application is not limited.
  • FIG. 1 is a schematic diagram showing spectrum transmission resources in a power wireless communication system according to an embodiment of the present application.
  • the spectrum of the 230MHz band is 223.025-235MHz (11.975MHz). This spectrum is allocated as a frequency point with a bandwidth of 25kHz, for a total of 480 frequencies.
  • each vertical line in Fig. 1 represents a frequency point in the power wireless communication system.
  • the proprietary frequency points of the 40 power wireless communication systems are as shown in Table 1 and Table 2.
  • a frequency point of 25 kHz as the bandwidth of the Resource Block (RB) as the bandwidth of the Resource Block (RB)
  • the total bandwidth of the available frequency points of the 40 power wireless communication systems is 1 MHz, corresponding to 640 available subcarriers.
  • FIG. 2 shows a basic transmission unit (ie, RB) of an embodiment of the present application.
  • the RB occupies a frequency point (25 kHz) in the frequency domain, including 16 subcarriers, that is, the subcarrier spacing is 1.5625 kHz, and the time domain occupies 8 ms, including two slots (Slot), each slot consisting of 5 positive Orthogonal Frequency Division Multiplexing (OFDM) symbol composition.
  • OFDM Orthogonal Frequency Division Multiplexing
  • one subcarrier in the frequency domain and one OFDM symbol in the time domain constitute one resource element (Resource Element, RE).
  • RE resource element
  • the timing precision of a narrowband device (25 kHz) is ⁇ 40 ⁇ m, and the Cyclic Prefix (CP) length of each OFDM symbol is set to 120 us.
  • the CP of the first OFDM symbol of each slot adds 200 us to 120us, which is used to provide the time required for frequency modulation for narrowband devices.
  • the first device is, for example, a base station
  • the second device is, for example, a terminal device.
  • the method 100 includes:
  • the first device determines a first synchronization signal, where the first synchronization signal is used by the second device for symbol timing alignment and frequency synchronization.
  • the first synchronization signal in S101 may correspond to a Primary Synchronization Signal (PSS) in an existing Long Term Revolution (LTE) system.
  • PSS Primary Synchronization Signal
  • LTE Long Term Revolution
  • the first device sends the first synchronization signal on each group of subcarriers of the M group of subcarriers, where K is a positive integer greater than or equal to 2.
  • each group of subcarriers may be consecutive multiple subcarriers, or may be multiple subcarriers that are not consecutive.
  • each group of subcarriers includes consecutive 12 subcarriers, or each group of subcarriers may be considered to include 16 consecutive subcarriers, 12 of which are Available subcarriers.
  • the first device transmits the first synchronization signal at each of the M frequency points, and transmits the M first synchronization signals in total.
  • the M frequency points may be a plurality of frequency points uniformly dispersed in the frequency domain.
  • the M frequency points may be frequency points 0, 5, 10, 15, 20, 25, 30, and 35 in the proprietary frequency points of the power wireless communication system. Since the first device transmits the first synchronization signal at a plurality of frequency points, interference diversity and frequency domain diversity can be provided.
  • the first synchronization signal does not carry Physical Cell Identifier (PCI) information
  • the first device sends a first synchronization signal by using Single Frequency Network (SFN) technology, since all The cell uses the same waveform to avoid interference of the neighboring cell with the first synchronization signal of the cell.
  • PCI Physical Cell Identifier
  • SFN Single Frequency Network
  • the first device determines a time domain resource for transmitting the first synchronization signal according to parameters such as a resource size of the subframe, a coverage radius requirement of the cell, and a transmission power of the first device.
  • the time domain resource used to transmit the first synchronization signal may be a partial resource of one subframe, or may be a resource of one subframe or multiple subframes.
  • the time domain resource for transmitting the first synchronization signal includes four subframes in one special radio frame (subframes #2, #3, #4, and #) 5) A total of 40 OFDM symbols.
  • the PSS in the existing LTE adopts a Zadoff-Chu (ZC) sequence of length 63, and the first synchronization signal adopts a short ZC sequence, so that the receiving end device performs segmentation processing.
  • ZC Zadoff-Chu
  • each OFDM constituting the first synchronization signal may be in the frequency domain by a ZC sequence having a prime number less than 12 in length. generate.
  • each OFDM symbol is generated in the frequency domain by a ZC sequence of length 11, wherein the OFDM symbols can be generated according to equation (1).
  • the first device before transmitting the first synchronization signal, performs precoding processing on the first synchronization signal, for example, performing orthogonal precoding processing, thereby being able to acquire spatial diversity during transmission, and improve anti-fading performance.
  • the first 20 OFDM symbols and the last 20 OFDM symbols of the first synchronization signal adopt orthogonal precoding, and the corresponding precoding matrices are respectively with
  • the second device determines, in the M group of subcarriers, the m groups of subcarriers for receiving the first synchronization signal sent by the first device, where M is an integer greater than or equal to 2, and m is less than M positive integers.
  • the second device may receive the first synchronization signal on a part of the M subcarriers. In this way, better detection performance is obtained. And enabling the terminal having the narrowband receiving function to successfully receive the first synchronization signal.
  • the second device receives the first synchronization signal only on a set of subcarriers, for example, the second device receives the first synchronization signal at a single frequency point in the power wireless communication system.
  • the frequency information of the first synchronization signal is sent by the first device in the second device, and the second device is configured to send the first synchronization signal from the first device according to the preset frequency information.
  • One of the frequency points is selected, and the first synchronization signal is received at the selected frequency.
  • a frequency point may be randomly selected. If the first synchronization signal is not found on the selected frequency point, the next frequency point may be randomly selected until the search is performed. To the first sync signal. Or the second device may select the frequency point closest to the center frequency point when determining the frequency point of receiving the first synchronization signal for the first time, if the first synchronization signal is not found at the selected frequency point, along the preset selection The direction selects the next frequency point farther from the center frequency point until the first synchronization signal is found.
  • the first device can transmit the first synchronization signal by using a long transmission time interval (TTI) to implement the first synchronization signal. Wide coverage.
  • TTI transmission time interval
  • the second device receives the first synchronization signal on each of the m groups of subcarriers.
  • the method 100 further includes:
  • the first device determines a second synchronization signal, where the second synchronization signal is used by the second device to perform frame timing alignment.
  • the second synchronization signal in S105 may correspond to a Secondary Synchronization Signal (SSS) in the existing Long Term Revolution (LTE) system. And the second synchronization signal is used by the second device for precise timing.
  • SSS Secondary Synchronization Signal
  • LTE Long Term Revolution
  • the first device sends a second synchronization signal on each of the K groups of subcarriers, where K is a positive integer greater than or equal to 2.
  • each group of subcarriers corresponds to one frequency point in the power wireless communication system. That is, the first device transmits a second synchronization signal at each of the K frequency points, and transmits a total of K second synchronization signals.
  • the first device may send the second synchronization signal at each of the frequency points of the 40 power wireless communication systems, capable of providing interference diversity and frequency domain diversity, and the second device may utilize the discrete frequency points.
  • the phase information of the upper subcarriers ie, subcarriers
  • the first device determines a time domain resource for transmitting the second synchronization signal according to parameters such as a resource size of the subframe, a coverage radius requirement of the cell, and a transmission power of the first device.
  • the time domain resource used to transmit the second synchronization signal may be a partial resource of one subframe, or may be a resource of one subframe or multiple subframes.
  • the time domain resource for transmitting the second synchronization signal includes 2 subframes (subframes #0 and #1) in one radio frame, for a total of 20 OFDM symbols.
  • the SSS in the existing LTE is different from the Zadoff-Chu (ZC) sequence interleaving with a length of 31, and the second synchronization signal adopts a short ZC sequence, so that the receiving device is in the right
  • ZC Zadoff-Chu
  • each OFDM constituting the second synchronization signal may be in the frequency domain by a ZC sequence of a prime number less than 12 in length. generate.
  • each OFDM symbol is generated in the frequency domain by a ZC sequence of length 11.
  • each OFDM symbol is generated in the frequency domain by a ZC sequence of length 11, wherein the OFDM symbols can be generated according to equation (2).
  • the second synchronization signal carries the PCI information, or the PCI information carried by the second synchronization signal is used to indicate the PCI of the current cell, and the second device is only based on the PCI information in the second synchronization signal.
  • the PCI of the current cell can be determined.
  • the second synchronization signal may include first PCI information indicating the first value and the second PCI information indicating the second value.
  • the second device determines the PCI of the current cell according to the first value, the second value, and the preset value combination rule.
  • the first 10 OFDN symbols are used to represent The last 10 OFDM symbols are used to represent The PCI of the current cell can be expressed as The OFDM symbol can be generated according to formula (3).
  • the first device before transmitting the second synchronization signal, performs precoding processing on the second synchronization signal, for example, performing orthogonal precoding processing, thereby being able to acquire spatial diversity and improve anti-fading performance during transmission. .
  • the first 10 OFDM symbols and the last 10 OFDM symbols of the first synchronization signal adopt orthogonal precoding, and the corresponding precoding matrices are respectively with
  • the first device performs scrambling on the second synchronization signal in the frequency domain before transmitting the second synchronization signal, for example, using a Pseudo Noise (PN) sequence to the second.
  • PN Pseudo Noise
  • the synchronization signal is subjected to the scrambling process, thereby reducing the system's Peak to Average Power Ratio (PAPR) and improving the signal's anti-interference performance.
  • PAPR Peak to Average Power Ratio
  • the second device receives the second synchronization signal sent by the first device on each of the K groups of subcarriers.
  • the second device may perform reception of the second synchronization signal on each of the K sets of subcarriers. If the second device does not support wideband reception, and the K-group subcarrier group used by the first device to transmit the second synchronization signal includes the m group of subcarriers used by the first device to transmit the first synchronization signal, the second device may receive Searching for the second synchronization signal on the m sets of subcarriers of the first synchronization signal.
  • the second device may receive the frequency of receiving the first synchronization signal. Second synchronization signal.
  • the method 100 further includes:
  • the first device determines a broadcast signal.
  • the broadcast signal in S108 may correspond to a System Information Block (SIB) message in an existing Long Term Revolution (LTE) system.
  • SIB System Information Block
  • LTE Long Term Revolution
  • the broadcast signal carries key system information such as the system frame number, so that the second device can acquire key system information according to the broadcast signal.
  • the first device sends the broadcast signal on each group of subcarriers of the P group of subcarriers, where P is a positive integer greater than or equal to 2.
  • each group of subcarriers corresponds to one frequency point in the power wireless communication system, that is, for the power wireless communication system, the first device is at each of the P frequency points.
  • a broadcast signal is transmitted, and a total of P broadcast signals are transmitted.
  • the first device transmits the broadcast signal on a frequency point for transmitting the first synchronization signal.
  • the first device transmits a broadcast signal to the second device at a plurality of frequency points, and can provide interference diversity and frequency domain diversity.
  • the first device determines a time domain resource for transmitting a broadcast signal according to a resource size of the subframe, a coverage radius requirement of the cell, and a transmit power of the first device.
  • the time domain resource used to transmit the broadcast signal may be a partial resource of one subframe, or may be a resource of one subframe or multiple subframes.
  • the time domain resource for transmitting a broadcast signal includes 9 subframes (subframe #6 - subframe #14) in one radio frame, for a total of 90 OFDM symbols.
  • the first device before the first device sends the broadcast signal, the first device performs orthogonal precoding processing on the broadcast signal, uses two orthogonal precoding matrices in the same RB, and uses orthogonal between adjacent REs. Precoding matrix.
  • the second device receives a broadcast signal on each of the P groups of subcarriers.
  • the second device may perform reception of the broadcast signal on each of the P sets of subcarriers. If the second device does not support wideband reception, and the P device of the P device that the first device uses to send the broadcast signal includes the m group of subcarriers used by the first device to send the first synchronization signal, the second device may receive the first A broadcast signal is searched for on m sets of subcarriers of a synchronization signal.
  • the second device may receive the broadcast signal at the frequency point of receiving the first synchronization signal.
  • the first device in the embodiment of the present application sends the first synchronization signal, the second synchronization signal, and the broadcast signal at each of the multiple frequency points, and the second device can perform the signal according to its own capability. Reception.
  • the communication method of the embodiment of the present application can simultaneously support a wideband receiver and a narrowband receiver.
  • FIG. 7 shows a schematic flow chart of a communication method in accordance with an embodiment of the present application.
  • the communication system is an example of a power system
  • the first device is a base station as an example.
  • the communication method is performed by a base station, and the communication method 200 includes:
  • the base station repeatedly maps the second synchronization signal in the first two subframes of the special radio frame and all available frequency points.
  • the base station scrambles the second synchronization signal with a granularity as a frequency point.
  • the base station repeatedly maps the first synchronization signal on the four subframes, the frequency points 0, 5, 10, 15, 20, 25, 30, and 35 of the second synchronization signal.
  • the base station repeatedly maps the broadcast signal on the 9 subframes, the frequency points 5, 10, 15, 20, 25, 30, and 35 of the first synchronization signal.
  • FIG. 8 shows a schematic flow chart of a communication method corresponding to the communication method shown in FIG.
  • the communication system takes the power system as an example, and the second device is used as the terminal device.
  • the communication method is performed by the terminal device, and the communication method 300 includes:
  • the receiver is a narrowband receiver in S305, receiving a second synchronization signal at a frequency point at which the first synchronization signal is detected;
  • the broadcast signal is received at a frequency point at which the first synchronization signal is detected.
  • the device 10 includes:
  • the processing module 11 is configured to determine a first synchronization signal, where the first synchronization signal is used by the second device for symbol timing alignment and frequency synchronization;
  • the transceiver module 12 is configured to use the first synchronization signal on each of the M groups of subcarriers, where M is a positive integer greater than or equal to 2.
  • the device transmits the first synchronization signal on each of the plurality of groups of subcarriers, so that the second device can select an appropriate bandwidth to receive the first synchronization signal according to its own receiving capability.
  • the device sends multiple first synchronization signals to the second device by using multiple sets of subcarriers, which can provide interference diversity and frequency domain diversity, and improve transmission reliability of the first synchronization signal.
  • the transceiver module 12 is specifically configured to: send, on each set of subcarriers of the M group of subcarriers, a device in all cells served by the device. a first synchronization signal, the devices in all cells including the second device.
  • the processing module 11 is specifically configured to perform precoding processing on the first synchronization signal to obtain a first synchronization signal after precoding processing, where the first synchronization
  • the precoding matrices used in the OFDM symbols included in the signal are not identical.
  • the processing module 11 is further configured to: determine a second synchronization signal, where the second synchronization signal is used by the second device to perform frame timing alignment;
  • the transceiver module 12 is further configured to send the second synchronization signal on each of the K groups of subcarriers, where K is a positive integer greater than or equal to 2.
  • the second synchronization signal is further used to indicate a physical cell identifier PCI of the current cell.
  • the second synchronization signal includes first PCI information and second PCI information, where the first PCI information is used to indicate a first value, and the second PCI information is used to indicate The second value
  • the processing module 11 is further configured to: determine the first PCI information and the second PCI information according to a preset value combination rule and a PCI of the current cell.
  • the processing module 11 is further configured to: perform pre-coding processing on the second synchronization signal to obtain a second synchronization signal after pre-coding processing, where the second synchronization
  • the precoding matrices used in the OFDM symbols included in the signal are not identical.
  • the processing module 11 is further configured to: perform scrambling processing on the second synchronization signal to obtain a second synchronization signal after the scrambling process.
  • the processing module 11 is further configured to: determine a broadcast signal; the transceiver module 12 is further configured to send the broadcast signal on each group of subcarriers of the P group of subcarriers.
  • P is a positive integer greater than or equal to 2.
  • the device 10 in the embodiment of the present application is embodied in the form of a functional unit.
  • the device 10 may correspond to the first device in some of the foregoing embodiments, and may be used to perform various processes and/or corresponding to the first device in the foregoing method embodiments. Steps, to avoid repetition, will not be repeated here.
  • the processing module 11 can be implemented by a processor.
  • the transceiver module 12 can be implemented by a transceiver. It should be understood that the transceiver can be a device having both a receiving function and a transmitting function, or a component device having a receiving function and a transmitting device having a transmitting function.
  • FIG. 10 illustrates an apparatus in accordance with another embodiment of the present application.
  • the device 20 includes:
  • the processing module 21 is configured to determine, in the M group of subcarriers, the m groups of subcarriers for receiving the first synchronization signal sent by the first device, where M is a positive integer greater than or equal to 2, and m is a positive integer less than M;
  • the transceiver module 22 is configured to receive the first synchronization signal on each of the m groups of subcarriers.
  • the device selects a subcarrier for receiving the first synchronization signal from among a plurality of sets of subcarriers used by the first device to transmit the first synchronization signal. Thereby, the device can receive the first synchronization signal over a narrower bandwidth, avoiding the influence of time drift on the first synchronization signal.
  • the M group subcarriers are used by the first device to send the subcarriers of the first synchronization signal to devices in all cells served by the first device.
  • the device in all the cells includes the second device.
  • the first synchronization signal is pre-coded by the first device, where a precoding matrix used by the OFDM symbol included in the first synchronization signal is incomplete the same.
  • the transceiver module 22 is further configured to: in the K group subcarriers The second synchronization signal sent by the first device is received on each group of subcarriers, and K is a positive integer greater than or equal to 2.
  • the M group subcarriers include the m groups of subcarriers
  • the transceiver module 22 is specifically configured to: receive the second synchronization signal sent by the first device on each of the m groups of subcarriers.
  • the second synchronization signal is further used to indicate a physical cell identifier PCI of the current cell
  • the processing module 21 is further configured to:
  • the second synchronization signal includes first PCI information and second PCI information, where the first PCI information is used to indicate a first value, and the second PCI information is used to indicate Second value
  • the processing module 21 is specifically configured to: determine, according to the preset value combination rule, the first value, and the second value, the PCI of the current cell.
  • the second synchronization signal is pre-coded by the first device, where a precoding matrix used by the OFDM symbol included in the second synchronization signal is incomplete the same.
  • the second synchronization signal is scrambled and processed by the first device.
  • the transceiver module 21 is further configured to: receive a broadcast on each group of subcarriers of the P group of subcarriers.
  • P is a positive integer greater than or equal to 2.
  • the M group subcarriers are included in the P group subcarriers
  • the transceiver module 21 is specifically configured to: receive the broadcast signal on the m group of subcarriers.
  • the device 20 in the embodiment of the present application is embodied in the form of a functional unit.
  • the device 20 may correspond to the second device in some of the foregoing embodiments, and may be used to perform various processes and/or corresponding to the second device in the foregoing method embodiments. Steps, to avoid repetition, will not be repeated here.
  • the processing module 21 can be implemented by a processor.
  • the transceiver module 22 can be implemented by a transceiver. It should be understood that the transceiver may be a device having both a receiving function and a transmitting function, or a component device having a receiving function and a transmitting device having a transmitting function.
  • Figure 11 illustrates an apparatus in accordance with yet another embodiment of the present application.
  • the device 100 includes a processor 110 and a transceiver 120.
  • the processor 110 is coupled to the transceiver 120.
  • the network device 100 further includes a memory 130.
  • the memory 130 is coupled to the processor 110.
  • the processor 110, the memory 130, and the transceiver 120 can communicate with each other through an internal connection path.
  • the processor 110 is configured to determine a first synchronization signal, where the first synchronization signal is used by the second device for symbol timing alignment and frequency synchronization, and the transceiver 120 is configured to use each group of the M group of subcarriers.
  • the first synchronization signal is transmitted on a carrier, and M is a positive integer greater than or equal to 2.
  • the device transmits the first synchronization signal on each of the plurality of groups of subcarriers, so that the second device can select an appropriate bandwidth to receive the first synchronization signal according to its own receiving capability.
  • the device sends multiple first synchronization signals to the second device by using multiple sets of subcarriers, which can provide interference diversity and frequency domain diversity, and improve transmission reliability of the first synchronization signal.
  • the device 100 may refer to the device 10 corresponding to the embodiment of the present application, and each unit/module in the network device and the foregoing other operations and/or functions are respectively used for the corresponding processes in the foregoing method, for the sake of brevity. I will not repeat them here.
  • FIG. 12 is a schematic block diagram of a device according to still another embodiment of the present application.
  • the device 200 includes a processor 210 and a transceiver 220.
  • the processor 210 and the transceiver 220 are connected, optionally,
  • the terminal device 200 further includes a memory 230, and the memory 230 is connected to the processor 210.
  • the processor 210, the memory 230, and the transceiver 220 can communicate with each other through an internal connection path.
  • the processor 210 is configured to determine, in the M group of subcarriers, the m group subcarriers for receiving the first synchronization signal sent by the first device, where M is a positive integer greater than or equal to 2, and m is a positive value smaller than M.
  • An integer; the transceiver 220 configured to receive the first synchronization signal on each of the m groups of subcarriers.
  • the device selects a subcarrier for receiving the first synchronization signal from among a plurality of sets of subcarriers used by the first device to transmit the first synchronization signal. Thereby, the device can receive the first synchronization signal over a narrower bandwidth, avoiding the influence of time drift on the first synchronization signal.
  • the device 200 may refer to the device 20 corresponding to the embodiment of the present application, and each unit/module in the device and the other operations and/or functions described above are respectively for the corresponding processes in the foregoing method, for the sake of brevity, This will not be repeated here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory.
  • the volatile memory can be a Random Access Memory (RAM) that acts as an external cache.
  • RAM Random Access Memory
  • many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM).
  • SDRAM Double Data Rate SDRAM
  • DDR SDRAM Double Data Rate SDRAM
  • ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Connection Dynamic Random Access Memory
  • DR RAM direct memory bus random access memory
  • the disclosed systems, devices, and methods 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.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请提供了一种通信方法和设备，该方法包括：第一设备确定第一同步信号，所述第一同步信号用于第二设备进行符号定时对准和频率同步；所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号，M为大于或等于2的正整数。根据本申请的通信方法，第一设备在多组子载波中的每组子载波上发送第一同步信号，使得第二设备能够根据自身的接收能力，选择合适的带宽进行第一同步信号的接收。由此，能够实现对具有宽带接收性能的设备以及具有窄带接收性能的设备的支持。并且第一设备通过多组子载波向第二设备发送多个第一同步信号，能够提供干扰分集和频域分集，提高第一同步信号的传输可靠性。

Description

通信方法和设备
本申请要求于2017年2月4日提交中国专利局、申请号为201710064026.6、申请名称为“通信方法和设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及通信方法和设备。
背景技术
智能电网的基本功能在于配电自动化、用电数据采集自动化、对电网关键节点的监控、以及通过数据实时反馈来预防事故的发生(比如重大停电)。随着新能源发电技术的发展，电网将颠覆以往只有发电厂供电的格局，每家每户都可能发电，并且按需相互传送来实现电能的灵活分配与转移。这种新型传输结构更加依赖于电网各节点间充分的信息交互。由于智能电网依赖于电网各节点间充分的电力系统信息交互，电力系统信息交互成为智能电网的关键技术。
若电力系统信息交互交由运营商代理，即利用公网实现电力通信，长期来看经济成本高，而且会对电力系统安全埋下隐患。所以电力专网的建立势在必行。国家电监会34号令明文规定，电力设备“三遥”，即遥信、遥测、遥控操作中的遥控操作，必须通过电力专网进行，不能使用公网，以免信息泄露，引发安全事故。利用光纤通信技术建立电力专网，成本高昂，甚至无法施工。成熟的无线通信系统作为一种柔性部署方案成为建立电力专网的重要手段。基于无线通信系统建立电力专网指的是电力企业自己建基站，打造一个专属于自己的无线网络。基于无线通信系统建立的电力专网称为电力无线专网或者电力无线通信系统。
因此，需要提供一种能够支持电力无线通信系统的通信方法，实现电力无线通信系统中信息的交互。
发明内容
本申请实施例提供一种通信方法和设备，能够支持电力无线通信系统，实现电力无线通信系统中信息的交互。
第一方面，提供了一种通信方法，包括：第一设备确定第一同步信号，所述第一同步信号用于第二设备进行符号定时对准和频率同步；所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号，M为大于或等于2的正整数。
根据本申请的通信方法，第一设备在多组子载波中的每组子载波上发送第一同步信号，使得第二设备能够根据自身的接收能力，选择合适的带宽进行第一同步信号的接收。由此，能够实现对具有宽带接收性能的设备以及具有窄带接收性能的设备的支持。并且第一设备通过多组子载波向第二设备发送多个第一同步信号，能够提供干扰分集和频域分 集，提高第一同步信号的传输可靠性。
在本申请实施例中，每组子载波可以是连续的多个子载波，也可以是不连续的多个子载波。例如，每组子载波可以为电力无线通信系统中一个资源块(Resource Block，RB)中包括的连续12个子载波。
结合第一方面，在第一方面的一种实现方式中，所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号，包括：所述第一设备在所述M组子载波中的每组子载波上向由所述第一设备提供服务的所有小区中的设备发送所述第一同步信号，所述所有小区中的设备包括所述第二设备。
也就是说，第一设备采用单频网(Single Frequency Network，SFN)技术向第二设备发送第一同步信号，能够避免邻小区对本小区的第一同步信号的干扰。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述第一设备确定第一同步信号，包括：所述第一设备确定N个长度为L的第一完备序列，M的取值为所述第一设备用于发送所述第一同步信号的时域资源包括的正交频分复用OFDM符号的个数，L为小于或等于每组子载波中的子载波个数的质数；所述第一设备根据第i个第一完备序列生成第i个OFDM符号，i＝1,2,…N；所述第一设备将N个OFDM符号组合成所述第一同步信号。
可选地，第一完备序列为Zadoff-Chu(ZC)序列。
由此，在第二设备需要对第一同步信号进行分段相关处理时，能够保持第一完备序列的相关优势。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，在所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号之前，所述方法还包括：所述第一设备对所述第一同步信号进行预编码处理，得到预编码处理后的第一同步信号，其中，所述N个OFDM符号采用的预编码矩阵不完全相同。
由于对第一同步信号进行了预编码处理，能够在发送的过程中获取空间分集，提高第一同步信号抗衰落的性能。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述方法还包括：所述第一设备确定第二同步信号，所述第二同步信号用于所述第二设备进行帧定时对准；所述第一设备在K组子载波中的每组子载波上发送所述第二同步信号，K为大于或等于2的正整数。
因此，第一设备在多组子载波中的每组子载波上向第二设备发送第二同步信号，能够提供频域分集和干扰分集，提高第二同步信号的传输可靠性。
可选地，K组子载波中的每组子载波包括电力无线通信系统中12个有效子载波，K的取值为40。也就是说，第一设备可以在电力系统中的40个电力专有频点上向第二设备发送第二同步信号。由此，能够实现第二设备的高精度定时。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述第二同步信号用于指示当前小区的物理小区标识PCI。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值，所述方法还包括：所述第一设备根据预设数值组合规则和所述当 前小区的PCI，确定所述第一PCI信息和所述第二PCI信息。
由此，能够降低第二设备的搜索复杂度。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述第一设备确定第二同步信号，包括：所述第一设备确定n个长度为l的第二完备序列，n的取值为所述第一设备用于发送所述第二同步信号的时域资源包括的OFDM符号的个数，l为小于或等于每组子载波中的子载波个数的质数；所述第一设备根据第j个第二完备序列生成第j个OFDM符号，j＝1,2,…n；所述第一设备将n个OFDM符号组合成所述第二同步信号。
可选地，第二完备序列为Zadoff-Chu(ZC)序列。
由此，在第二设备需要对第二同步信号进行分段相关处理时，能够保持第二完备序列的相关优势。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，在所述第一设备在K组子载波中的每组子载波上发送所述第二同步信号之前，所述方法还包括：所述第一设备对所述第二同步信号进行预编码处理，得到预编码处理后的第二同步信号，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
由于对第二同步信号进行预编码处理，能够提高第二同步信号的抗衰落能力，提高第二同步信号传输可靠性。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，在所述第一设备在K组子载波中的每组子载波上发送所述第二同步信号之前，所述方法还包括：所述第一设备对所述第二同步信号进行加扰处理，得到加扰处理后的第二同步信号。
由于对第二同步信号进行了加扰处理，能够降低第二同步信号的峰值平均功率比(Peak to Average Power Ratio，PAPR)，提高抗干扰性能。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述方法还包括：所述第一设备确定广播信号；所述述第一设备在P组子载波中的每组子载波上发送所述广播信号，P为大于或等于2的正整数。
由此，第一设备在多组子载波中的每组子载波上向第二设备发送广播信号，能够提供干扰分集和频域分集，提高广播信号的传输可靠性。
可选地，第一设备用于发送广播信号的传输资源与用于发送第一同步信号的传输资源在频域上包括相同的频域资源。
第二方面，提供了一种通信方法，其特征在于，包括：第二设备确定M组子载波中用于接收第一设备发送的第一同步信号的m组子载波，所述第一同步信号用于所述第二设备进行符号定时对准和频率同步，M为大于或等于2的正整数，m为小于M的正整数；所述第二设备在所述m组子载波中的每组子载波上接收所述第一同步信号。
根据本申请的通信方法，第二设备从第一设备用于发送第一同步信号的多组子载波中选择用于接收第一同步信号的子载波。由此，第二设备可以在较窄的带宽上接收第一同步信号，避免时间漂移对第一同步信号的影响，并能够支持只具有窄带接收能力的设备。
结合第二方面，在第二方面的一种实现方式中，所述M组子载波为所述第一设备用于向由所述第一设备提供服务的所有小区中的设备发送所述第一同步信号的子载波，所述所有小区中的设备包括所述第二设备。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第一同步信号 是由N个正交频分复用OFDM符号组合而成的，所述N个OFDM符号中的第i个OFDM符号是由所述第一设备根据第i个长度为L的第一完备序列生成的，N的取值为所述第一设备用于发送所述第一同步信号的时域资源包括的OFDM符号的个数，L为小于或等于每组子载波中的子载波个数的质数，i＝1,2,…N。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第一同步信号是经过所述第一设备预编码处理过的，其中，所述第一同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，在所述第二设备根据所述第一同步信号，进行符号定时对准和频率同步之后，所述方法还包括：所述第二设备在K组子载波中的每组子载波上接收所述第一设备发送的第二同步信号，K为大于或等于2的正整数。
由此，第二设备在多组子载波上接收第二同步信号，能够使得第二设备根据不同子载波(可用子载波)的相位信息得到高精度的定时效果。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述K组子载波包括所述m组子载波；其中，所述第二设备在K组子载波中的每组子载波上接收所述第一设备发送的第二同步信号，包括：所述第二设备在所述m组子载波中的每组子载波上接收所述第一设备发送的所述第二同步信号。
由此，第二设备可以只在用于接收第一同步信号的子载波上接收第二同步信号，可以支持只具有窄带接收功能的设备。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第二同步信号用于指示当前小区的物理小区标识PCI，所述方法还包括：所述第二设备根据所述第二同步信号，确定所述当前小区的PCI。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值；
其中，所述第二设备根据所述第二同步信号，确定所述当前小区的PCI，包括：所述第二设备根据预设数值组合规则、所述第一数值和所述第二数值，确定所述当前小区的PCI。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第二同步信号是由n个OFDM符号组合而成的，所述n个OFDM符号中的第j个OFDM符号是由第一设备根据第j个长度为l的第二完备序列生成的，n的取值为所述第一设备用于发送所述第二同步信号的时域资源包括的OFDM符号的个数，l为小于或等于每组子载波中包括的子载波个数的质数，j＝1,2,…n。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第二同步信号是经过所述第一设备预编码处理过的，其中，所述第二同步信号包括的OFDM符号采用的预编码矩阵不完全相同。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第二同步信号是经过所述第一设备加扰处理过的。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，在所述第二设备根 据所述第二同步信号进行帧定时对准之后，所述方法还包括：所述第二设备在P组子载波中的每组子载波上接收广播信号，P为大于或等于2的正整数。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述P组子载波中包括所述m组子载波，其中，所述第二设备在P组子载波中的每组子载波上接收广播信号，包括：所述第二设备在所述m组子载波上接收所述广播信号。
由此，第二设备可以只在用于接收第一同步信号的子载波上接收第二同步信号，可以支持只具有窄带接收功能的设备。
第三方面，提供了一种设备，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。具体地，所述设备包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的功能模块。
第四方面，提供了一种设备，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。具体地，所述设备包括用于执行上述第二方面或第二方面的任意可能的实现方式中的方法的功能模块。
第五方面，提供了一种设备，包括处理器、存储器和收发器。所述处理器、所述存储器和所述收发器之间通过内部连接通路互相通信，传递控制和/或数据信号，使得所述设备执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第六方面，提供了一种设备，包括处理器、存储器和收发器。所述处理器、所述存储器和所述收发器之间通过内部连接通路互相通信，传递控制和/或数据信号，使得所述设备执行上述第二方面或第二方面的任意可能的实现方式中的方法。
第七方面，提供了一种计算机可读介质，用于存储计算机程序，所述计算机程序包括用于执行上述第一方面或第一方面的任意可能的实现方式中的指令。
第八方面，提供了一种计算机可读介质，用于存储计算机程序，所述计算机程序包括用于执行上述第二方面或第二方面的任意可能的实现方式中的指令。
附图说明
图1是本申请实施例的电力无线通信系统中的频谱传输资源的示意图；
图2是本申请实施例电力无线通信系统中的基本传输单元的示意图；
图3是根据本申请实施例的通信方法的示意性流程图；
图4是根据本申请实施例的时域资源的示意图；
图5是根据本申请实施例的通信方法的另一示意性流程图；
图6是根据本申请实施例的通信方法的再一示意性流程图；
图7是根据本申请另一实施例的通信方法的示意性流程图；
图8是与图7所述的通信方法相对应的通信方法的示意性流程图；
图9是根据本申请实施例的设备的示意性框图；
图10是根据本申请另一实施例的设备的示意性框图；
图11是根据本申请再一实施例的设备的示意性框图；
图12是根据本申请再一实施例的设备的示意性框图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
本申请实施例的通信方法可以应用于物联网系统，包括但不限于电力无线通信系统。由于在物联网系统中，有些设备需要大规模部署，这些设备通常选择成本较低的窄带收发机。因此无法采用传统的无线通信机制，实现系统中的信息交互。
针对上述技术问题，本申请提出一种通信方法和设备，能够支持多种通信系统，实现信息的交互。
需要说明的是，以下在描述本申请实施例的通信方法时，以电力无线通信系统为例进行描述，仅仅是为了描述方便，并不对本申请的保护范围构成限定。
图1示出了本申请实施例的电力无线通信系统中的频谱传输资源的示意图。如图1所示，230MHz频段频谱范围是223.025-235MHz(11.975MHz)，这段频谱以25kHz的带宽作为一个频点进行分配，共480个频点。480个频点的起始频点为223.025MHz，终止频点为235MHz，共占据12MHz(235MHz-223.025MHz+25kHz＝12MHz)的带宽。230MHz频段频谱的480个频点中有40个频点被划分为电力无线通信系统的专有频点，且这40个电力无线通信系统的专有频点(共1MHz)分散在这480个频点中，图1中的每一条竖线代表电力无线通信系统中的一个频点。
具体地，40个电力无线通信系统的专有频点如表1和表2所示。
表1
Figure PCTCN2018075146-appb-000001
表2
Figure PCTCN2018075146-appb-000002
Figure PCTCN2018075146-appb-000003
并且，如图1所示的，230MHz频段频谱中电力无线通信系统的专有频段的起始频点与终止频点相距8.150MHz(8.125MHz+25kHz＝8.150MHz)。以一个频点25kHz作为资源块(Resource Block，RB)的带宽，每个RB分为16个子载波(subcarriers)，8.150MHz对应16*(8.150MHz/25kHz)＝5216个子载波。40个电力无线通信系统的可用频点的总带宽为1MHz，对应640个可用子载波。
具体地，图2示出了本申请实施例的基本传输单元(即RB)。RB在频域上占据一个频点(25kHz)，包括16个子载波，即子载波间隔为1.5625kHz，在时域上占据8ms，包括两个时隙(Slot)，每个时隙由5个正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)符号组成。并且频域上的1个子载波和时域上的一个OFDM符号构成一个资源单元(Resource Element，RE)。
一般地，考虑到100km小区的时延扩展为17us，窄带设备(25kHz)的定时精度为±40μm，设置每个OFDM符号的循环前缀(Cyclic Prefix，CP)长度为120us。每个时隙的第一个OFDM符号的CP在120us基础上增加200us，用来为窄带设备提供调频所需的时间。
下面将结合图1和图2详细描述根据本申请实施例的通信方法。需要说明的是，本申请实施例中第一设备例如为基站，第二设备例如为终端设备。如图3所示，方法100包括：
S101，第一设备确定第一同步信号，第一同步信号用于第二设备进行符号定时对准和频率同步。
需要说明的是，S101中的第一同步信号可以对应现有长期演进(Long Term Revolution，LTE)系统中的主同步信号(Primary Synchronization Signal，PSS)。并且第一同步信号用于第二设备解决时间和频率的不确定性，完成粗略同步。
S102，第一设备在M组子载波中的每组子载波上发送所述第一同步信号，K为大于或等于2的正整数。
可选地，在S102中，每组子载波可以是连续的多个子载波，也可以是不连续的多个子载波。例如，当第一设备和第二设备为电力无线通信系统中的设备时，每组子载波包括连续的12个子载波，或者可以认为每组子载波包括连续的16个子载波，其中的12个为可用子载波。
也就是说，对于电力无线通信系统，第一设备在M个频点中的每个频点上发送第一 同步信号，共发送M个第一同步信号。可选地，M个频点可以是在频域上均匀分散的多个频点。例如，M个频点可以是电力无线通信系统的专有频点中的频点0、5、10、15、20、25、30和35。由于第一设备在多个频点上发送第一同步信号，能够提供干扰分集和频域分集。
进一步地，在一些实施例中，第一同步信号不携带物理小区标识(Physical Cell Identifier，PCI)信息，第一设备采用单频网(Single Frequency Network，SFN)技术发送第一同步信号，由于所有小区使用相同的波形，能够避免邻小区对本小区第一同步信号的干扰。
具体地，在一些实施例中，第一设备根据子帧的资源大小、小区的覆盖半径要求以及第一设备的发送功率等参数，确定用于传输第一同步信号的时域资源。例如，用于传输第一同步信号的时域资源可以是一个子帧的部分资源，或者可以是一个子帧或多个子帧的资源。
例如，如图4中所示出的，用于传输第一同步信号的时域资源包括一个特殊无线帧(Special Radio Frame)中的四个子帧(子帧#2、#3、#4和#5)，共40个OFDM符号。
在本申请的一些实施例中，与现有LTE中的PSS采用长度为63的Zadoff-Chu(ZC)序列不同的是，第一同步信号采用短ZC序列，使得接收端设备在进行分段处理时，能够保持自相关性能的优势。
在本申请实施例中，由于电力无线通信系统中一个频点中的可用子载波个数为12，所以组成第一同步信号的每个OFDM可以由长度为小于12的质数的ZC序列在频域生成。例如，每个OFDM符号由一个长度为11的ZC序列在频域生成，其中，OFDM符号可以根据公式(1)生成。
Figure PCTCN2018075146-appb-000004
公式(1)中，r l(n)表示编号为l的OFDM符号，l＝0,1,2…39，n＝0,1,2…N FFT-1,N FFT为快速傅里叶变换(Fast Fourier Transform，FFT)大小，N ZC为ZC序列的长度，l和μ l的对应关系如表3所示。
表3
Figure PCTCN2018075146-appb-000005
Figure PCTCN2018075146-appb-000006
进一步地，第一设备在发送第一同步信号之前，对第一同步信号进行预编码处理，例如，进行正交的预编码处理，由此能够在发送时，获取空间分集，提高抗衰落的性能。
举例来说，假设第一设备具有2根天线，第一同步信号的前20个OFDM符号和后20个OFDM符号采用正交的预编码，对应的预编码矩阵分别为
Figure PCTCN2018075146-appb-000007
和
Figure PCTCN2018075146-appb-000008
S103，第二设备确定M组子载波中用于接收第一设备发送的第一同步信号的m组子载波，M为大于或等于2的整数，m为小于M个正整数。
需要说明的是，虽然第一设备在多组子载波中的每组子载波上发送了第一同步信号，但是第二设备可以在M组子载波中的部分子载波上接收第一同步信号，以此获得较好的侦测性能。并使得至具有窄带接收功能的终端能够成功接收到第一同步信号。
可选地，在一些实施例中，第二设备只在一组子载波上上接收第一同步信号，例如，第二设备在电力无线通信系统中的单个频点上接收第一同步信号。具体来说，可以在第二设备中预先配置第一设备用于发送第一同步信号的频点信息，第二设备根据预先配置的频点信息从第一设备用于发送第一同步信号的多个频点中选择一个频点，在选择的这个频点上接收第一同步信号。
并且，在第二设备选择接收第一同步信号的频点时，可以随机选择一个频点，如果在选择的频点上搜寻不到第一同步信号，可以再随机选择下一个频点，直至搜寻到第一同步信号。或者第二设备在第一次确定接收第一同步信号的频点时，可以选择离中心频点最近的频点，如果在选择的频点上未搜寻到第一同步信号，沿预设的选择方向选择离中心频点较远的下一个频点，直至搜寻到第一同步信号。
由于第二设备可以采用部分频点(甚至是一个频点)接收第一同步信号，第一设备可以采用长传输时间间隔(Transmission Time Interval，TTI)来发送第一同步信号，实现第一同步信号的广覆盖。
S104，第二设备在m组子载波中的每组子载波上接收所述第一同步信号。
在本申请实施例中，进一步地，如图5所示出的，方法100还包括：
S105，第一设备确定第二同步信号，第二同步信号用于第二设备进行帧定时对准；
需要说明的是，S105中的第二同步信号可以对应现有长期演进(Long Term Revolution，LTE)系统中的辅同步信号(Secondary Synchronization Signal，SSS)。并且第二同步信号用于第二设备进行精确定时。
S106，第一设备在K组子载波中的每组子载波上发送第二同步信号，K为大于或等于2的正整数。
可选地，在S106中，每组子载波对应电力无线通信系统中的一个频点。也就是说，第一设备在K个频点中的每个频点上发送第二同步信号，共发送K个第二同步信号。可选地，第一设备可以在40个电力无线通信系统的频点中的每个频点上发送第二同步信号，能够提供干扰分集和频域分集，并且第二设备可以利用离散的频点上的子载波(即可用子载波)的相位信息得到高精度的定时效果。
具体地，在一些实施例中，第一设备根据子帧的资源大小、小区的覆盖半径要求以及第一设备的发送功率等参数，确定用于发送第二同步信号的时域资源。例如，用于发送第二同步信号的时域资源可以是一个子帧的部分资源，或者可以是一个子帧或多个子帧的资源。
例如，如图4中所示出的，用于发送第二同步信号的时域资源包括一个无线帧中的2个子帧(子帧#0和#1)，共20个OFDM符号。
在本申请的一些实施例中，与现有LTE中的SSS采用长度为31的Zadoff-Chu(ZC)序列交错构成不同的是，第二同步信号采用短ZC序列，使得接收端设备在对第二同步下信号进行分段处理时，能够保持自相关性能的优势。
在本申请实施例中，由于电力无线通信系统中一个频点中的可用子载波个数为12，所以组成第二同步信号的每个OFDM可以由长度为小于12的质数的ZC序列在频域生成。例如，每个OFDM符号由一个长度为11的ZC序列在频域生成。例如，每个OFDM符号由一个长度为11的ZC序列在频域生成，其中，OFDM符号可以根据公式(2)生成。
Figure PCTCN2018075146-appb-000009
公式(2)中，r k(n)表示编号为k的OFDM符号，k＝0,1,2…19，n＝0,1,2…N FFT-1,N FFT为FFT大小，N ZC为ZC序列的长度。
进一步地，在一些实施例中，第二同步信号携带PCI信息，或者说，第二同步信号携带的PCI信息用于指示当前小区的PCI，第二设备仅根据第二同步信号中的PCI信息即可以确定当前小区的PCI。
更进一步地，为了降低第二设备的搜索复杂度，第二同步信号可以包括第一PCI信息和第二PCI信息，第一PCI信息指示第一数值，第二PCI信息指示第二数值。第二设备在接收到第二同步信号时，根据第一数值、第二数值以及预设数值组合规则，确定出当前小区的PCI。
举例来说，以第二同步信号包括20个OFDM符号为例，前10个OFDN符号用于表示
Figure PCTCN2018075146-appb-000010
后10个OFDM符号用于表示
Figure PCTCN2018075146-appb-000011
当前小区的PCI可以表示为
Figure PCTCN2018075146-appb-000012
OFDM符号可以根据公式(3)生成。
Figure PCTCN2018075146-appb-000013
公式(3)中，r l(n)表示编号为l的OFDM符号，l＝0,1,2…,19，n＝0,1,2…N FFT-1,N FFT为FFT大小，N ZC为ZC序列的长度，
Figure PCTCN2018075146-appb-000014
l和μ l的对应关系如表4所示。
表4
Figure PCTCN2018075146-appb-000015
进一步地，第一设备在发送第二同步信号之前，对第二同步信号进行预编码处理，例如，进行正交的预编码处理，由此能够在发送时，获取空间分集，提高抗衰落的性能。
举例来说，假设第一设备具有2根天线，第一同步信号的前10个OFDM符号和后10个OFDM符号采用正交的预编码，对应的预编码矩阵分别为
Figure PCTCN2018075146-appb-000016
和
Figure PCTCN2018075146-appb-000017
在上述实施例中，可选地，第一设备在发送第二同步信号之前，对第二同步信号在频域上进行加扰处理，例如，采用伪噪声(Pseudo Noise，PN)序列对第二同步信号进项加 扰处理，由此能够降低系统的峰值平均功率比(Peak to Average Power Ratio，PAPR)，提高信号的抗干扰性能。
S107，第二设备在K组子载波中的每组子载波上接收第一设备发送的第二同步信号。
具体地，在一些实施例中，如果第二设备支持宽带接收，第二设备可以在K组子载波中的每组子载波上进行第二同步信号的接收。如果第二设备不支持宽带接收，并且第一设备用于发送第二同步信号的K组子载波组中包括第一设备用于发送第一同步信号的m组子载波，第二设备可以在接收到第一同步信号的m组子载波上搜寻第二同步信号。
也就是说，当第一设备用于发送第二同步信号的频点中包括第二设备用于发送第一同步信号的频点时，第二设备可以在接收第一同步信号的频点上接收第二同步信号。
在本申请实施例中，进一步地，如图6所示出的，方法100还包括：
S108，第一设备确定广播信号；
需要说明的是，S108中的广播信号可以对应现有长期演进(Long Term Revolution，LTE)系统中的系统信息块(System Information Block，SIB)消息。广播信号中携带系统帧序号等关键系统信息，使得第二设备能够根据广播信号获取关键系统信息。
S109，第一设备在P组子载波中的每组子载波上发送所述广播信号，P为大于或等于2的正整数。
可选地，在S109中，每组子载波对应电力无线通信系统中的一个频点，也就是说，对于电力无线通信系统来说，第一设备在P个频点中的每个频点上发送广播信号，共发送P个广播信号。
可选地，第一设备在用于发送第一同步信号的频点上发送广播信号。第一设备在多个频点上向第二设备发送广播信号，能够提供干扰分集和频域分集。
具体地，在一些实施例中，第一设备根据子帧的资源大小、小区的覆盖半径要求以及第一设备的发送功率等参数，确定用于发送广播信号的时域资源。例如，用于发送广播信号的时域资源可以是一个子帧的部分资源，或者可以是一个子帧或多个子帧的资源。
例如，如图4中所示出的，用于发送广播信号的时域资源包括一个无线帧中的9个子帧(子帧#6-子帧#14)，共90个OFDM符号。
进一步地，在第一设备发送广播信号之前，第一设备对广播信号进行正交预编码处理，在同一个RB中采用两个正交的预编码矩阵，并且相邻的RE之间采用正交的预编码矩阵。
S110，第二设备在P组子载波中的每组子载波上接收广播信号。
具体地，在一些实施例中，如果第二设备支持宽带接收，第二设备可以在P组子载波中的每组子载波上进行广播信号的接收。如果第二设备不支持宽带接收，并且第一设备用于发送广播信号的P组子载波中包括第一设备用于发送第一同步信号的m组子载波时，第二设备可以在接收到第一同步信号的m组子载波上搜寻广播信号。
也就是说，当第一设备用于发送广播信号的频点中包括第二设备用于发送第一同步信号的频点时，第二设备可以在接收第一同步信号的频点上接收广播信号。
综上所述，本申请实施例中的第一设备在多个频点中的每个频点上发送第一同步信号、第二同步信号以及广播信号，第二设备可以根据自身的能力进行信号的接收。由此本申请实施例的通信方法能够同时支持宽带接收机和窄带接收机。
图7示出了根据本申请一个具体实施例的通信方法的示意性流程图。通信系统为电力 系统为例，以第一设备为基站为例。该通信方法由基站执行，该通信方法200包括：
S201，基站在特殊无线帧的前两个子帧、所有可用的频点上重复映射第二同步信号；
S202，基站对第二同步信号以频点为粒度进行加扰；
S203，基站在紧邻第二同步信号的4个子帧、频点0、5、10、15、20、25、30和35上重复映射第一同步信号；
S204，基站在紧邻第一同步信号的9个子帧、频点5、10、15、20、25、30和35上重复映射广播信号。
相对应地，图8示出了与图7示出的通信方法相对应的通信方法的示意性流程图。通信系统以电力系统为例，以第二设备为终端设备为例，该通信方法由终端设备执行，该通信方法300包括：
S301，在第一同步信号出现的频点中随机选择一个频点用于接收第一同步信号，避开没有搜寻到第一同步信号的频点；
S302，确定在选择的频点上是否侦测到第一同步信号；
S303，如果在S302中侦测到第一同步信号，根据第一同步信号进行粗略的时间同步和频率同步；
S304，如果在S302中未侦测到第一同步信号，返回S301；
S305，确定接收机是否为宽带接收机；
S306，如果在S305中确定是接收机是宽带接收机，在第二同步信号的所有发送频点上接收第二同步信号；
S307，如果在S305中确定接收机时窄带接收机，在侦测到第一同步信号的频点上接收第二同步信号；
S308，根据接收到的第二同步信号进行高精度定时，并获取当前小区的PCI；
S309，如果在S305中确定接收机是宽带接收机，在广播信号的所有发送频点上接收广播信号；
S310，如果在S305中确定接收机是窄带接收机，在侦测到第一同步信号的频点上接收广播信号。
以上结合图3至图8详细描述了根据本申请实施例的通信方法，下面将结合图9至图12详细描述根据本申请实施例的设备。如图9所示，设备10包括：
处理模块11，用于确定第一同步信号，所述第一同步信号用于第二设备进行符号定时对准和频率同步；
收发模块12，用于在M组子载波中的每组子载波上所述第一同步信号，M为大于或等于2的正整数。
因此，根据本申请实施例的设备在多组子载波中的每组子载波上发送第一同步信号，使得第二设备能够根据自身的接收能力，选择合适的带宽进行第一同步信号的接收。由此，能够实现对具有宽带接收性能的设备以及具有窄带接收性能的设备的支持。并且设备通过多组子载波向第二设备发送多个第一同步信号，能够提供干扰分集和频域分集，提高第一同步信号的传输可靠性。
在本申请实施例中，可选地，所述收发模块12具体用于：在所述M组子载波中的每组子载波上向由所述设备提供服务的所有小区中的设备发送所述第一同步信号，所述所有 小区中的设备包括所述第二设备。
在本申请实施例中，可选地，所述处理模块11具体用于：对所述第一同步信号进行预编码处理，得到预编码处理后的第一同步信号，其中，所述第一同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
在本申请实施例中，可选地，所述处理模块11还用于：确定第二同步信号，所述第二同步信号用于所述第二设备进行帧定时对准；
所述收发模块12，还用于在K组子载波中的每组子载波上发送所述第二同步信号，K为大于或等于2的正整数。
在本申请实施例中，可选地，所述第二同步信号还用于指示当前小区的物理小区标识PCI。
在本申请实施例中，可选地，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值，所述处理模块11还用于：根据预设数值组合规则和所述当前小区的PCI，确定所述第一PCI信息和所述第二PCI信息。
在本申请实施例中，可选地，所述处理模块11还用于：对所述第二同步信号进行预编码处理，得到预编码处理后的第二同步信号，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
在本申请实施例中，可选地，所述处理模块11还用于：对所述第二同步信号进行加扰处理，得到加扰处理后的第二同步信号。
在本申请实施例中，可选地，所述处理模块11还用于：确定广播信号；所述收发模块12，还用于在P组子载波中的每组子载波上发送所述广播信号，P为大于或等于2的正整数。
应理解，本申请实施例中的设备10以功能单元的形式体现。在一个可选例子中，本领域技术人员可以理解，设备10可以对应于上述某些实施例中的第一设备，可以用于执行上述方法实施例中与第一设备对应的各个流程和/或步骤，为避免重复，在此不再赘述。
具体地，在本申请实施例中，处理模块11可以由处理器实现。收发模块12可以由收发器实现，应理解，收发器可以是同时具备接收功能与发送功能的器件，也可以是具备接收功能的接收器件与具备发送功能的发送器件的组件器件。
图10示出了根据本申请另一实施例的设备。如图10所示，设备20包括：
处理模块21，用于确定M组子载波中用于接收第一设备发送的第一同步信号的m组子载波，M为大于或等于2的正整数，m为小于M的正整数；
收发模块22，用于在所述m组子载波中的每组子载波上接收所述第一同步信号。
因此，根据本申请实施例的设备从第一设备用于发送第一同步信号的多组子载波中选择用于接收第一同步信号的子载波。由此，设备可以在较窄的带宽上接收第一同步信号，避免时间漂移对第一同步信号的影响。
在本申请实施例中，可选地，所述M组子载波为所述第一设备用于向由所述第一设备提供服务的所有小区中的设备发送所述第一同步信号的子载波，所述所有小区中的设备包括所述第二设备。
在本申请实施例中，可选地，所述第一同步信号是经过所述第一设备预编码处理过的， 其中，所述第一同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
在本申请实施例中，可选地，在所述设备根据所述第一同步信号，进行符号定时对准和频率同步之后，所述收发模块22还用于：在K组子载波中的而每组子载波上接收所述第一设备发送的第二同步信号，K为大于或等于2的正整数。
在本申请实施例中，可选地，所述K组子载波中包括所述m组子载波；
其中，所述收发模块22具体用于：在所述m组子载波中的每组子载波上接收所述第一设备发送的所述第二同步信号。
在本申请实施例中，可选地，所述第二同步信号还用于指示当前小区的物理小区标识PCI，所述处理模块21还用于：
根据所述第二同步信号，确定所述当前小区的PCI。
在本申请实施例中，可选地，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值；
其中，所述处理模块21具体用于：根据预设数值组合规则、所述第一数值和所述第二数值，确定所述当前小区的PCI。
在本申请实施例中，可选地，所述第二同步信号是经过所述第一设备预编码处理过的，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
在本申请实施例中，可选地，所述第二同步信号是经过所述第一设备加扰处理过的。在本申请实施例中，可选地，在所述设备根据第二同步信号进行帧定时对准之后，所述收发模块21还用于：在P组子载波中的每组子载波上接收广播信号，P为大于或等于2的正整数。
在本申请实施例中，可选地，所述P组子载波中包括所述m组子载波；
其中，所述收发模块21具体用于：在所述m组子载波上接收所述广播信号。
应理解，本申请实施例中的设备20以功能单元的形式体现。在一个可选例子中，本领域技术人员可以理解，设备20可以对应于上述某些实施例中的第二设备，可以用于执行上述方法实施例中与第二设备对应的各个流程和/或步骤，为避免重复，在此不再赘述。
具体地，在本申请实施例中，处理模块21可以由处理器实现。收发模块22可以由收发器实现，应理解，收发器可以是同时具备接收功能与发送功能的器件，也可以是具备接收功能的接收器件与具备发送功能的发送器件的组件器件。
图11示出了根据本申请再一实施例的设备。如图11所示，设备100包括处理器110和收发器120，处理器110和收发器120相连，可选地，该网络设备100还包括存储器130，存储器130与处理器110相连。其中，处理器110、存储器130和收发器120可以通过内部连接通路互相通信。其中，处理器110，用于确定第一同步信号，所述第一同步信号用于第二设备进行符号定时对准和频率同步；收发器120，用于在M组子载波中的每组子载波上发送所述第一同步信号，M为大于或等于2的正整数。
因此，根据本申请实施例的设备在多组子载波中的每组子载波上发送第一同步信号，使得第二设备能够根据自身的接收能力，选择合适的带宽进行第一同步信号的接收。由此，能够实现对具有宽带接收性能的设备以及具有窄带接收性能的设备的支持。并且设备通过多组子载波向第二设备发送多个第一同步信号，能够提供干扰分集和频域分集，提高第一同步信号的传输可靠性。
根据本申请实施例的设备100可以参照对应本申请实施例的设备10，并且，该网络设备中的各个单元/模块和上述其他操作和/或功能分别为了上述方法中的相应流程，为了简洁，在此不再赘述。
图12示出了根据本申请再一实施例的设备的示意性框图，如图12所示，设备200包括：处理器210和收发器220，处理器210和收发器220相连，可选地，所述终端设备200还包括存储器230，存储器230与处理器210相连。其中，处理器210、存储器230和收发器220可以通过内部连接通路互相通信。其中，所述处理器210，用于确定M组子载波中用于接收第一设备发送的第一同步信号的m组子载波，M为大于或等于2的正整数，m为小于M的正整数；所述收发器220，用于在所述m组子载波中的每组子载波上接收所述第一同步信号。
因此，根据本申请实施例的设备从第一设备用于发送第一同步信号的多组子载波中选择用于接收第一同步信号的子载波。由此，设备可以在较窄的带宽上接收第一同步信号，避免时间漂移对第一同步信号的影响。
根据本申请实施例的设备200可以参照对应本申请实施例的设备20，并且，该设备中的各个单元/模块和上述其他操作和/或功能分别为了上述方法中的相应流程，为了简洁，在此不再赘述。
可以理解，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (33)

  1. 一种通信方法，其特征在于，包括：
    第一设备确定第一同步信号，所述第一同步信号用于第二设备进行符号定时对准和频率同步；
    所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号，M为大于或等于2的正整数。
  2. 根据权利要求1所述的通信方法，其特征在于，所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号，包括：
    所述第一设备在所述M组子载波中的每组子载波上向由所述第一设备提供服务的所有小区中的设备发送所述第一同步信号，所述所有小区中的设备包括所述第二设备。
  3. 根据权利要求1或2所述的通信方法，其特征在于，所述第一设备确定第一同步信号，包括：
    所述第一设备确定N个长度为L的第一完备序列，N的取值为所述第一设备用于发送所述第一同步信号的时域资源包括的正交频分复用OFDM符号的个数，L为小于或等于每组子载波中的子载波个数的质数；
    所述第一设备根据第i个第一完备序列生成第i个OFDM符号，i＝1,2,…N；
    所述第一设备将N个OFDM符号组合成所述第一同步信号。
  4. 根据权利要求3所述的通信方法，其特征在于，在所述第一设备在M组子载波中的每组子载波上发送所述第一同步信号之前，所述方法还包括：
    所述第一设备对所述第一同步信号进行预编码处理，得到预编码处理后的第一同步信号，其中，所述N个OFDM符号采用的预编码矩阵不完全相同。
  5. 根据权利要求1至4中任一项所述的通信方法，其特征在于，所述方法还包括：
    所述第一设备确定第二同步信号，所述第二同步信号用于所述第二设备进行帧定时对准；
    所述第一设备在K组子载波中的每组子载波上发送所述第二同步信号，K为大于或等于2的正整数。
  6. 根据权利要求5所述的通信方法，其特征在于，所述第二同步信号还用于指示当前小区的物理小区标识PCI。
  7. 根据权利要求6所述的通信方法，其特征在于，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值，所述方法还包括：
    所述第一设备根据预设数值组合规则和所述当前小区的PCI，确定所述第一PCI信息和所述第二PCI信息。
  8. 根据权利要求5至7中任一项所述的通信方法，其特征在于，在所述第一设备在K组子载波中的每组子载波上发送所述第二同步信号之前，所述方法还包括：
    所述第一设备对所述第二同步信号进行预编码处理，得到预编码处理后的第二同步信号，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  9. 一种通信方法，其特征在于，包括：
    第二设备确定M组子载波中用于接收第一设备发送的第一同步信号的m组子载波，所述第一同步信号用于所述第二设备进行符号定时对准和频率同步，M为大于或等于2的正整数，m为小于M的正整数；
    所述第二设备在所述m组子载波中的每组子载波上接收所述第一同步信号。
  10. 根据权利要求9所述的通信方法，其特征在于，所述M组子载波为所述第一设备用于向由所述第一设备提供服务的所有小区中的设备发送所述第一同步信号的子载波，所述所有小区中的设备包括所述第二设备。
  11. 根据权利要求9或10所述的通信方法，其特征在于，所述第一同步信号是经过所述第一设备预编码处理过的，其中，所述第一同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  12. 根据权利要求9至11中任一项所述的通信方法，其特征在于，在所述第二设备根据所述第一同步信号，进行符号定时对准和频率同步之后，所述方法还包括：
    所述第二设备在K组子载波中的每组子载波上接收所述第一设备发送的第二同步信号，K为大于或等于2的正整数。
  13. 根据权利要求12所述的通信方法，其特征在于，所述K组子载波中包括所述m组子载波；
    其中，所述第二设备在K组子载波中的每组子载波上接收所述第一设备发送的第二同步信号，包括：
    所述第二设备在所述m组子载波中的每组子载波上接收所述第一设备发送的所述第二同步信号。
  14. 根据权利要求12或13所述的通信方法，其特征在于，所述第二同步信号还用于指示当前小区的物理小区标识PCI，所述方法还包括：
    所述第二设备根据所述第二同步信号，确定所述当前小区的PCI。
  15. 根据权利要求14所述的通信方法，其特征在于，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值；
    其中，所述第二设备根据所述第二同步信号，确定所述当前小区的PCI，包括：
    所述第二设备根据预设数值组合规则、所述第一数值和所述第二数值，确定所述当前小区的PCI。
  16. 根据权利要求12至15中任一项所述的通信方法，其特征在于，所述第二同步信号是经过所述第一设备预编码处理过的，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  17. 根据权利要求12至16中任一项所述的通信方法，其特征在于，在所述第二设备根据所述第二同步信号进行帧定时对准之后，所述方法还包括：
    所述第二设备在P组子载波中的每组子载波上接收广播信号，P为大于或等于2的正整数。
  18. 一种设备，其特征在于，包括：
    处理模块，用于确定第一同步信号，所述第一同步信号用于第二设备进行符号定时对 准和频率同步；
    收发模块，用于在M组子载波中的每组子载波上发送所述第一同步信号，M为大于或等于2的正整数。
  19. 根据权利要求18所述的设备，其特征在于，所述收发模块具体用于：
    在所述M组子载波中的每组子载波上向由所述设备提供服务的所有小区中的设备发送所述第一同步信号，所述所有小区中的设备包括所述第二设备。
  20. 根据权利要求18或19所述的设备，其特征在于，所述处理模块具体用于：
    对所述第一同步信号进行预编码处理，得到预编码处理后的所述第一同步信号，其中，所述第一同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  21. 根据权利要求18至20中任一项所述的设备，其特征在于，所述处理模块还用于：
    确定第二同步信号，所述第二同步信号用于所述第二设备进行帧定时对准；
    所述收发模块，还用于在K组子载波中的每组子载波上发送所述第二同步信号，K为大于或等于2的正整数。
  22. 根据权利要求21所述的设备，其特征在于，所述第二同步信号还用于指示当前小区的物理小区标识PCI。
  23. 根据权利要求22所述的设备，其特征在于，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值，所述处理模块还用于：
    根据预设数值组合规则和所述当前小区的PCI，确定所述第一PCI信息和所述第二PCI信息。
  24. 根据权利要求21至23中任一项所述的设备，其特征在于，所述处理模块还用于：
    对所述第二同步信号进行预编码处理，得到预编码处理后的第二同步信号，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  25. 一种设备，其特征在于，包括：
    处理模块，用于确定M组子载波中用于接收第一设备发送的第一同步信号的m组子载波，M为大于或等于2的正整数，m为小于M的正整数；
    收发模块，用于在所述m组子载波中的每组子载波上接收所述第一同步信号。
  26. 根据权利要求25所述的设备，其特征在于，所述M组子载波为所述第一设备用于向由所述第一设备提供服务的所有小区中的设备发送所述第一同步信号的子载波，所述所有小区中的设备包括所述第二设备。
  27. 根据权利要求25或26所述的设备，其特征在于，所述第一同步信号是经过所述第一设备预编码处理过的，其中，所述第一同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  28. 根据权利要求25至27中任一项所述的设备，其特征在于，在所述设备根据所述第一同步信号，进行符号定时对准和频率同步之后，所述收发模块还用于：
    在K组子载波中的而每组子载波上接收所述第一设备发送的第二同步信号，K为大于或等于2的正整数。
  29. 根据权利要求28所述的设备，其特征在于，所述K组子载波中包括所述m组子载波；
    其中，所述收发模块具体用于：
    在所述m组子载波中的每组子载波上接收所述第一设备发送的所述第二同步信号。
  30. 根据权利要求28或29所述的设备，其特征在于，所述第二同步信号还用于指示当前小区的物理小区标识PCI，所述处理模块还用于：
    根据所述第二同步信号，确定所述当前小区的PCI。
  31. 根据权利要求30所述的设备，其特征在于，所述第二同步信号包括第一PCI信息和第二PCI信息，所述第一PCI信息用于指示第一数值，所述第二PCI信息用于指示第二数值；
    其中，所述处理模块具体用于：
    根据预设数值组合规则、所述第一数值和所述第二数值，确定所述当前小区的PCI。
  32. 根据权利要求28至31中任一项所述的设备，其特征在于，所述第二同步信号是经过所述第一设备预编码处理过的，其中，所述第二同步信号中包括的OFDM符号采用的预编码矩阵不完全相同。
  33. 根据权利要求28至32中任一项所述的设备，其特征在于，在所述设备根据第二同步信号进行帧定时对准之后，所述收发模块还用于：
    在P组子载波中的每组子载波上接收广播信号，P为大于或等于2的正整数。
PCT/CN2018/075146 2017-02-04 2018-02-02 通信方法和设备 WO2018141273A1 (zh)

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