WO2016000258A1 - Procédé de synchronisation lte et dispositif et système associés - Google Patents

Procédé de synchronisation lte et dispositif et système associés Download PDF

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Publication number
WO2016000258A1
WO2016000258A1 PCT/CN2014/081652 CN2014081652W WO2016000258A1 WO 2016000258 A1 WO2016000258 A1 WO 2016000258A1 CN 2014081652 W CN2014081652 W CN 2014081652W WO 2016000258 A1 WO2016000258 A1 WO 2016000258A1
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Prior art keywords
sequence
sss
pci
lte system
intra
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PCT/CN2014/081652
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English (en)
Chinese (zh)
Inventor
龚政委
丁仁天
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华为技术有限公司
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Priority to CN201480029102.4A priority Critical patent/CN105409301B/zh
Priority to PCT/CN2014/081652 priority patent/WO2016000258A1/fr
Publication of WO2016000258A1 publication Critical patent/WO2016000258A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an LTE synchronization method and related devices and systems.
  • M2M machine to machine communication
  • M2M services have also expanded into automotive remote communication, consumer electronics, fleet management, and smart metering.
  • various low-power, low-cost, wide coverage and flexible deployment of M2M communication systems are research hotspots.
  • the evolution of various communication systems has naturally become the first choice for M2M systems.
  • LTE Long Term Evolution
  • the existing UE User Equipment
  • the cell search includes a series of synchronization phases to obtain time synchronization and frequency synchronization.
  • the synchronization phase requires a large number of blind searches, so the time and resource overhead of synchronization is huge.
  • resource-constrained scenarios such as narrow-band M2M communication, for example, in low-cost UE chip communication, it is particularly necessary to optimize the time overhead and resource overhead of the synchronization channel.
  • the embodiments of the present invention provide an LTE synchronization method and related devices and systems, so as to reduce the synchronization complexity of the UE and reduce the time and resource overhead of synchronization.
  • a first aspect of the present invention provides an LTE synchronization method, including:
  • the user equipment detects the PSS sequence of the primary synchronization signal, and cyclically correlates the PSS sequence with the a ZC sequence included in the ZC sequence set, and obtains the number of the PSS sequence, where a is a positive integer less than or equal to 3; a secondary synchronization signal SSS sequence, wherein the SSS sequence is associated with a b-type M-sequence included in the M-sequence set, and the number of the SSS sequence is obtained, b is a positive integer less than or equal to 168, and a and b
  • the product is less than 504; the synchronization is performed by using the detected PSS sequence and the SSS sequence, wherein the physical layer cell identifier PCI is determined according to the number of the PSS sequence and the number of the SSS sequence.
  • the M sequence set includes: b corresponding to the PCI packets selected from the 168 physical layer cell identifier PCI packets of the LTE system, where c is subtracted from 1
  • the SSS sequence, c is equal to 168/b rounded down; or, the SSS sequence corresponding to the first b PCI packets selected from the 168 PCI packets of the LTE system.
  • the ZC sequence set includes: a PSS sequence corresponding to a number in any one of three intra-group numbers of the LTE system;
  • the ZC sequence set includes: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system;
  • the M sequence set includes: an LTE system The SSS sequence corresponding to the first b PCI packets of the 168 PCI packets.
  • the ZC sequence set includes: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system;
  • the M-sequence set includes: Two M sequence subsets respectively corresponding to two PSS sequences in the ZC sequence set, wherein one M sequence subset includes all SRS sequences corresponding to all 168 PCI packets of the LTE system, and another M sequence subset includes LTE
  • the SSS sequence corresponding to the d PCI packets in the system, d N-168, N is the number of PCI, and N is a positive integer greater than 168 but less than or equal to 336;
  • the SSS sequence and the M sequence collection The cyclic correlation of the included b M sequences includes: determining a subset of M sequences corresponding to the detected PSS sequences, and cyclically correlating the SSS sequences with the M sequences included in the subset of the M sequences.
  • the PSS sequence and the SSS sequence are mapped to a frequency resource
  • the subcarrier spacing is less than 15KHz.
  • a second aspect of the present invention provides an LTE synchronization method, including:
  • the base station device selects one intra-group number from the three intra-group numbers of the physical layer cell identifier PCI packet of the LTE system, and the PSS sequence corresponding to the intra-synchronization number corresponding to the a-group number constitutes a PSS sequence candidate set, where a a positive integer less than or equal to 3; the base station device selects b PCI packets from 168 physical layer cell identifier PCI packets of the LTE system, and forms a secondary synchronization signal SSS sequence corresponding to the b PCI packets to form an SSS sequence candidate.
  • the base station device selects a PSS sequence from the PSS sequence candidate set and sends the PSS sequence to the user equipment, and selects an SSS sequence from the SSS sequence candidate set to send to the user equipment, so that the user equipment detects the PSS sequence. Synchronizing with the SSS.
  • the base station device selects a type of intra-group number from the three intra-group numbers of the physical layer d and the area identifier PCI packet of the LTE system, including: selecting an LTE system All three groups are numbered; the base station device selects 1) from the 168 physical layer cell identification PCI packets of the LTE system?
  • the 0 packet includes: selecting b PCI packets from the 168 PCI packets at intervals of c minus 1, c equals 168/b rounding down; or, selecting the first b PCIs of the 168 PCI packets Grouping.
  • the base station device selects a type of intra-group number from three intra-group numbers of a physical layer cell identifier PCI packet of the LTE system, including: three types of LTE systems are selected. Number of any one of the intra-group numbers;
  • the base station device selects 1) of the 168 physical layer cell identification PCI packets of the LTE system?
  • the 0 packet includes: selecting the first b PCI packets of the 168 PCI packets, b equals the number of PCIs N, and N is a positive integer less than or equal to 168.
  • the base station device selects a type of intra-group number from three intra-group numbers of physical layer cell identifier PCI packets of the LTE system, including: three types of LTE systems are selected. Number of any two of the intra-group numbers;
  • the base station device selects 1) from the 168 physical layer cell identification PCI packets of the LTE system?
  • the 0 packet includes: selecting the first b PCI packets of the 168 PCI packets, wherein if the number of PCI N is an even number, b is equal to N/2; if the number of PCI N is an odd number, b is equal to N/2 upward Rounded up, N is a positive integer less than or equal to 336.
  • the determining, by the base station device, the in-group number from the three intra-group numbers of the physical layer cell identifier PCI packet of the LTE system includes: selecting three types of the LTE system The number of any two of the intra-group numbers; the base station device selects b PCI packets from the 168 physical layer d and the area identification PCI packets of the LTE system, and the secondary synchronization signals SSS corresponding to the b PCI packets
  • the sequence composition SSS sequence candidate set includes: for the selected first intra-group number, the base station device selects a secondary synchronization signal SSS sequence corresponding to all 168 PCI packets of the LTE system, and the composition corresponds to the first intra-group number a first SSS sequence candidate set; for the selected second intra-group number, the base station device selects a secondary synchronization corresponding to d PCI packets from 168 PCI packets of the LTE system
  • the signal SSS sequence which constitutes a second S
  • the PSS sequence and the SSS sequence are mapped to a frequency resource
  • the subcarrier spacing is less than 15KHz.
  • a third aspect of the present invention provides a user equipment, including:
  • a first detecting module configured to detect a primary synchronization signal PSS sequence, and cyclically correlate the PSS sequence with a type of ZC sequence included in the ZC sequence set, to obtain a number of the PSS sequence, where a is less than or equal to 3
  • the second detection module is configured to detect the secondary synchronization signal SSS sequence, and cyclically correlate the SSS sequence with the b M sequences included in the M sequence set, and obtain the number of the SSS sequence, where b is less than or equal to 168.
  • a synchronization module configured to perform synchronization using the detected PSS sequence and the SSS sequence, wherein, according to the number of the PSS sequence and the number of the SSS sequence Determine the physical layer cell identity PCI.
  • the M sequence set includes: b PCI packet corresponding to the 168 physical layer cell identifier PCI packets of the LTE system selected by using c minus 1 as an interval
  • the SSS sequence, c is equal to 168/b rounded down; or, the SSS sequence corresponding to the first b PCI packets selected from the 168 PCI packets of the LTE system.
  • the ZC sequence set includes: a PSS sequence corresponding to the intra-group number of any one of the three intra-group numbers of the LTE system;
  • the M-sequence set includes: The SSS sequence corresponding to the first b PCI packets of the 168 PCI packets of the LTE system.
  • the ZC sequence set includes: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system;
  • the M-sequence set includes: The SSS sequence corresponding to the first b PCI packets of the 168 PCI packets of the LTE system.
  • the ZC sequence set includes: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system;
  • the M-sequence set includes: Two M sequence subsets respectively corresponding to two PSS sequences in the ZC sequence set, wherein one M sequence subset includes all SRS sequences corresponding to all 168 PCI packets of the LTE system, and another M sequence subset includes LTE
  • the SSS sequence corresponding to d PCI packets in the system, d N-168, N is a number of PCIs, and N is a positive integer greater than 168 but less than or equal to 336;
  • the cyclically correlating the SSS sequence with the b M sequences included in the M sequence set includes: determining a corresponding PSS sequence corresponding to the detected The M sequence sub-set, the SSS sequence is cyclically related to the M sequence included in the M sequence subset.
  • the PSS sequence and the SSS sequence are mapped to a frequency resource
  • the subcarrier spacing is less than 15KHz.
  • a fourth aspect of the present invention provides a base station device, including:
  • a first selection module configured to select a type of intra-group number from three intra-group numbers of the physical layer cell identifier PCI packet of the LTE system, and form a PSS sequence of the primary synchronization signal corresponding to the number of the group within the group
  • the selection, a is a positive integer less than or equal to 3; the second selection module is configured to select 1) from the 168 physical layer cell identification PCI packets of the LTE system? 1 group, will the 1)?
  • the subsynchronization signal SSS sequence corresponding to the 1 packet constitutes an SSS sequence candidate set, b is a positive integer less than or equal to 168, and the product of a and b is less than 504;
  • the sending module is configured to select a PSS from the PSS sequence candidate set The sequence is sent to the user equipment, and an SSS sequence is selected from the SSS sequence candidate set and sent to the user equipment, so that the user equipment synchronizes by detecting the PSS sequence and the SSS.
  • the first selecting module is specifically configured to select all three intra-group numbers of the LTE system; and the second selecting module is specifically configured to subtract c from 1 selects b PCI packets from the 168 PCI packets for interval, c equals 168/b rounding down; or selects the first b PCI packets of the 168 PCI packets.
  • the first selection module is specifically configured to select any one of three intra-group numbers of the LTE system; the second selection module, Specifically, it is used to select the first b PCI packets in the 168 PCI packets, where b is equal to the number of PCIs N, and N is a positive integer less than or equal to 168.
  • the first selecting module is specifically configured to select any two intra-group numbers in the three intra-group numbers of the LTE system; the second selecting module, Specifically, it is used to select the first b PCI packets in the 168 PCI packets, where b is equal to N/2 if the number of PCIs N is an even number; if the number of PCIs N is an odd number, b is equal to N/2 Integrity, N is less than or equal to 336 Positive integer.
  • the first selecting module is specifically configured to select any two intra-group numbers in the three intra-group numbers of the LTE system; Specifically, for the selected first intra-group number, the base station device selects a secondary synchronization signal SSS sequence corresponding to all 168 PCI packets of the LTE system, and forms a first SSS sequence corresponding to the first intra-group number. For the selected second intra-group number, the base station device selects a secondary synchronization signal SSS sequence corresponding to d PCI packets from 168 PCI packets of the LTE system, and forms a sequence corresponding to the second group number.
  • the second SSS sequence candidate set, d N-168, N is the number of PCIs, and N is a positive integer greater than 168 but less than or equal to 336.
  • the PSS sequence and the SSS sequence are mapped to a frequency resource
  • the subcarrier spacing is less than 15KHz.
  • a fifth aspect of the present invention provides a wireless communication system, comprising: a user equipment according to the third aspect of the present invention, and a base station apparatus according to the fourth aspect of the present invention.
  • a sixth aspect of the present invention provides a user equipment, where the user equipment includes a processor, a memory, a bus, and a communication interface; the memory is configured to store a computer execution instruction, and the processor is connected to the memory through the bus.
  • the processor executes the computer-executed instructions stored by the memory to cause the user equipment to perform the LTE synchronization method according to the first aspect of the present invention when the user equipment is operating.
  • a seventh aspect of the present invention provides a base station device, where the base station device includes a processor, a memory, a bus, and a communication interface, where the memory is used to store a computer execution instruction, and the processor is connected to the memory through the bus.
  • the processor executes the computer-executed instructions stored by the memory to cause the user equipment to perform the LTE synchronization method according to the second aspect of the present invention when the user equipment is operating.
  • An eighth aspect of the invention provides a computer storage medium comprising computer executed instructions for execution by the processor of the computer to execute the computer execution instructions, the computer executing the LTE synchronization method as described in the first aspect of the invention.
  • a ninth aspect of the present invention provides a computer storage medium comprising computer execution instructions for The computer executes the LTE synchronization method according to the second aspect of the present invention when the processor of the computer executes the computer-executed instructions.
  • FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of LTE synchronization and cell search
  • FIG. 3 is a schematic flowchart of an LTE synchronization method according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of another LTE synchronization method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a base station device according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of another user equipment according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of another base station device according to an embodiment of the present invention.
  • the embodiments of the present invention provide an LTE synchronization method and related devices and systems, so as to reduce the synchronization complexity of the UE and reduce the time and resource overhead of synchronization.
  • LTE A total of 504 different Physical Layer IDs (PCIs) are defined. These 504 PCIs correspond to the LTE physical layer protocol 36.21. The value ranges from 0 to 503. Each PCI corresponds to a specific one. Downlink reference signal sequence. All PCI sets are divided into 168 groups (corresponding to N in protocol 36.211), ranging from 0 to 167), each group containing 3 cell IDs (corresponding to N in protocol 36, 2, 11 , value range 0 ⁇ 2 ). PCI is determined by the group number N ⁇ and the number N in the group, PCi number: 3 «.
  • the synchronization of LTE includes two processes of primary synchronization and secondary synchronization, and two downlink synchronization signals are defined: Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (S'S'S).
  • PSS Primary Synchronization Signal
  • S'S'S Secondary Synchronization Signal
  • the PSS maps the first OFDM (Orthogonal Frequency Di ision Midtipk ⁇ ng) of the (slot) in the first time of subframes 0 and 5.
  • the symbol that is, the 7th OFDM symbol of the 1st time and the 1st time slot; the SSS and the PSS mapping are transmitted in the same sub-slot, but the SSS is one OFDM symbol ahead of the PSS, that is, the SSS is mapped in the ⁇ th
  • the sixth symbol of the time slot and the 1st L time slot is mapped in the ⁇ th OFDM symbol of the time slot and the 1st L time slot.
  • the PSS is mapped to the third OFDM symbol in subframes 1 and 6 (ie, DwPTS); and the last OFDM symbol of SSS in subframes 0 and 5 , 3 OFDM symbols ahead of PSS.
  • both PSS and SSS occupy 72 subcarriers in the center of the channel, of which 62 subcarriers in the bandwidth center are used, and 5 subcarriers are left on each side for the protection band.
  • the UE will try to receive PSS and SSS near the center frequency of the IJTE bandwidth it supports.
  • the PSS uses a ZC (Zadoff ⁇ C.hu) sequence of length 63 (there are DC subcarriers in the middle, so the length of the transmission is actually 62), plus 5 subcarriers reserved for the guard band in the boundary, forming PSS occupying 72 subcarriers in the center of bandwidth.
  • the PSS has three values, corresponding to three different Zadoff-Chu sequences, each of which corresponds to a number N in a PCI group.
  • the sequence corresponding to the PSS of a cell is determined by the PCI of the cell.
  • Root index u As shown in Table 1, different Ns correspond to different root index values (root index u), which in turn determines different ZC sequences. V ID Root index u
  • the UE When the UE receives the PSS, it will use the Root index u to try to decode the PSS until one of the Root Index u successfully solves the PSS. In this way, the UE knows the cell. Since the location of the PSS in the time domain is fixed, the UE can obtain the 5 nis timing of the cell. Since there are two PSSs in a 10ms system, and the two PSS sequences are the same, the UE does not know whether the solved PSS is the first 5ms PSS sequence or the last 5ms PSS sequence, so only 5 ms timing can be obtained ( Timing).
  • SSS is a sequence of 62 lengths obtained by cross-cascading two M-sequences of length 31, similar to PSS, plus 5 subcarriers reserved for use as guard bands in the boundary, forming 72 subcarriers occupying the bandwidth center.
  • the SSS cross-cascading mode of the first half frame and the cross-level of the second half frame can take 31 different values for each M-sequence, which is actually the same M
  • SSS sequences correspond to the PCI packet number ⁇ by the offset sequence (m0, ral) respectively.
  • the UE After the UE detects the PSS, it knows the location where the SSS may appear (if the UE supports both FDD and TDD, there are at most 4 locations). The UE detects and successfully decodes the SSS, and determines One of the 168 values in Table 2 determines the PCI packet number N ⁇ . In turn, the PCI number is determined, :2NX
  • the cross-cascade mode of the SSS it can be determined whether the SSS is located in the subframe 0 or the subframe 5, and further determines the position of the subframe 0 in the system frame, that is, 10 ms timing, thereby realizing Frame synchronization.
  • the location in which the SSS appears can determine which of the FDD and TDD modes of operation.
  • the primary synchronization process is first performed.
  • the UE performs cyclic correlation with the received PSS sequences by using different three sets of local ZC sequences, and the number of the PSS sequence is determined by the correlation peak, and the completion is completed.
  • Time domain synchronization the UE performs cyclic correlation by using 168 different local ⁇ sequences and the received SSS sequence, and determines the number N ⁇ of the SSS sequence selected by the transmitting base station device from the correlation peak.
  • the UE synchronizes with the detected PSS sequence and the SSS sequence, where the physical layer cell identifier (PCI) may be determined according to the number of the PSS sequence and the number of the SSS sequence, PCI number-3 + N.
  • PCI physical layer cell identifier
  • the number of LTE cells in the same-frequency networking is large, reaching 504, and the secondary synchronization process needs to perform 168 correlation comparisons, which makes the terminal complexity high, and the time overhead and resource overhead are large. Reduce power consumption and cost disadvantages.
  • the subcarrier spacing is 15 kHz, and the system bandwidth is at least 1.4 MHz. That is, the LTE synchronization channel design can only be applied to systems with a system bandwidth of 1.4 MHz or more.
  • the subcarrier spacing is less than 15 kHz, and the system bandwidth is less than 1.4 MHz. If the initial frequency offset is relatively large, a raster search of the frequency is needed, which greatly improves the complexity of the UE receiving algorithm. We need to simplify the existing synchronization channel to meet the narrowband M2M system.
  • the wireless communication system includes: a user equipment 100 and a base station apparatus 200.
  • the wireless communication system is an LTE system, and may be an LTE-based M2M communication system or other types of communication systems based on LTE.
  • the base station device is configured to provide an LTE cell, and may send a primary synchronization signal PSS through a primary synchronization channel (P-SCH) and a secondary synchronization signal SSS through a secondary synchronization channel (S-SCH).
  • P-SCH primary synchronization channel
  • S-SCH secondary synchronization signal
  • the user equipment (UE) can synchronize with the LTE cell by detecting the PSS and the SSS, and then access the LTE cell.
  • FIG. 2 it is a schematic diagram of LTE synchronization and cell search.
  • the UE detects the P-SCH at several central frequency points where the LTE cell may exist, and receives the PSS sequence ⁇
  • the UE may further receive a downlink reference signal (DL_RS) sent by the base station to implement more precise synchronization of the time slot and the frequency.
  • DL_RS downlink reference signal
  • the UE may perform a cell search, and receive a PBCH (Physical Broadcast Channel) signal sent by the base station, and extract the MIB (Master Information Block) carried therein to obtain some system information, such as downlink system bandwidth. , PHICH configuration, number of antennas, system frame number (SFN), etc.;
  • PBCH Physical Broadcast Channel
  • MIB Master Information Block
  • an embodiment of the present invention provides a long-term evolution LTE synchronization method, which may include: 110.
  • a user equipment detects a primary synchronization signal PSS sequence, and includes a ZC included in the PSS sequence and the ZC sequence set. The sequence is cyclically related, and the number of the PSS sequence is obtained, where a is a positive integer less than or equal to 3.
  • the terminal synchronization complexity of the M2M system is reduced by reducing the number of physical layer cells multiplexed by the synchronization sequence. That is, the number of total PCIs is reduced by reducing three PSS sequences in the existing LTE system to two or one, or by reducing 168 SSS sequences.
  • the SSS sequence may be reduced without reducing the PSS sequence; in other embodiments, the PSS sequence and the SSS sequence may also be reduced simultaneously.
  • a type may be arbitrarily selected from three PSS sequences corresponding to the three intra-group numbers of the LTE system, a is 1 or 2 or 3, and the selected a PSS sequences are grouped into one set.
  • the PSS sequence used in the LTE system is specifically a ZC sequence.
  • the set of the a PSS sequences may be referred to as a ZC sequence set.
  • the received PSS sequence may be cyclically related to the a ZC sequence included in the local ZC sequence set, and the detected number of the PSS sequence is obtained.
  • the main synchronization process only one cycle correlation is required, and when a is less than 3, the complexity of the primary synchronization can be reduced, and the time and resource overhead can be reduced.
  • the user equipment detects a secondary synchronization signal SSS sequence, and performs cyclic correlation between the SSS sequence and the b M sequences included in the M sequence set, and obtains a number of the SSS sequence, where b is a positive integer less than or equal to 168, and The product of a and b is less than 504.
  • b types may be arbitrarily selected from 168 SSS sequences corresponding to 168 PCI packets of the LTE system, where b is a positive integer less than or equal to 168, and the selected b SSS sequences are combined into one set.
  • the SSS sequence used in the LTE system is specifically an M sequence.
  • the set of the b SSS sequences may be referred to as an M sequence set.
  • the user equipment may cyclically correlate the received SSS sequence with the b M sequences included in the local M sequence set, and obtain the detected number of the SSS sequence.
  • only b cycles are required to be correlated.
  • the complexity of the secondary synchronization can be reduced, and the time and resource overhead can be reduced.
  • a and b are less than 504, a is less than 3 or b is less than 168. Therefore, the complexity of synchronization can be reduced, and time and resource overhead can be reduced.
  • the UE can complete the 5ms timing according to the detected PSS sequence, and then complete the 10ms timing according to the detected SSS sequence to achieve frame synchronization.
  • the PCI of the physical layer cell can be determined according to the number of the PSS sequence and the number of the SSS sequence.
  • PCI number A ⁇ L3 N ⁇ + A ⁇ , N ⁇ is the number of the detected SSS sequence, and N is the number of the detected PSS sequence.
  • the three sets of ZC sequences of the primary synchronization can be kept unchanged, and the secondary synchronization is reduced.
  • the M sequence set may include: an SSS sequence corresponding to b PCI packets selected from 168 physical layer cell identifier PCI packets of the LTE system with c minus 1 interval, c equal to
  • N ⁇ l3 ⁇ 4 can be calculated, with N ⁇ - l as the interval, evenly in error! The reference source was not found.
  • select the corresponding PCI packet offset sequence where the symbol "" is rounded down.
  • I ⁇ from the original table 2 select N every 11, select in turn N may be 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, a total of 14, as shown by the hatched portion in Table 3.
  • N ⁇ 16, , N, which is selected every 10 times, may be 0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, a total of 16.
  • the set of ⁇ sequence may include: an SSS sequence corresponding to the first b PCI packets selected from 168 PCI packets of the LTE system. Select among the 168 PCI packet sequences shown in Table 2. For the first b, a total of 3b PCIs can be supported.
  • the packet number is small.
  • the offset sequence corresponding to the cell packet number N ⁇ of the M2M system is identical to the offset sequence corresponding to the cell packet number of the existing LTE system.
  • the number of three sets of ZC sequences of the primary synchronization can be reduced, and the number of subsynchronous ⁇ sequences is also reduced, and the secondary synchronization channel is redesigned. Mapping between offset sequence and PCI packet number Relationship.
  • the ZC sequence set may include: a PSS sequence corresponding to any one of the three intra-group numbers of the LTE system; the M sequence set includes: 168 PCI packets of the LTE system The first b PCI packets correspond to the SSS sequence.
  • the number of ZC sequences of the original primary synchronization is 3, which is determined by the three root sequence index values of the ZC sequence ⁇ 25, 29, 34 ⁇ , which can be reduced to 1 or 2 according to the number of cell users, and the cells supported according to specific needs. The number determines the number of secondary synchronization cells per group.
  • the number of PSS is one, and the ZC sequence with the root sequence index value of ⁇ 29 ⁇ can be preferentially selected, and the number of SSS sequences is b.
  • Table 2 can be selected.
  • the first b of the 168 N ⁇ s constitute a local M sequence set.
  • the selection result is as shown in Table 4. This embodiment is applied to N m or less in the case of 168, especially for the case of N m of less than 31, less than 31 when N m, N ID before the selected offset sequence number N ⁇ (m., M,) There is no duplication and it is easier to detect and identify.
  • the ZC sequence set may include: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system; the M-sequence set may include: 168 PCI packets of the LTE system The SSS sequence corresponding to the first b PCI packets in the middle.
  • This embodiment is particularly applicable to the case where the N ID is greater than or equal to 31 but less than or equal to 336. The following details:
  • For the PSS sequence determine the number of PSS sequences to be 2, and select the root sequence index value as ⁇ 25.
  • the ZC sequence of 29 ⁇ is used as the primary synchronization cell ID, and the ZC sequence with the root sequence of ⁇ 29, 34 ⁇ can be selected as the primary synchronization cell ID, and the ZC sequence with the root sequence of ⁇ 25, 29 ⁇ can also be selected as the primary synchronization cell.
  • the SSS sequences corresponding to the first b PCI packets in Table 2 may be selected. Further, if the N ID is an even number, the two sets of SSS sequences may be allocated before the ⁇ /2 cells as the SSS. If the N ID is an odd number, LN/2" SSS cells N may be allocated for the first PSS sequence, and LN/2" + 1 SSS cells N may be allocated for the second PSS sequence.
  • the cyclically correlating the SSS sequence with the b M sequences included in the M sequence set may include: determining a M sequence subset corresponding to the detected PSS sequence, and the SSS sequence and the M The M sequences included in the sequence sub-set are cyclically related.
  • This embodiment is particularly applicable to the case where the N ID is greater than 168 but less than or equal to 336. Specifically, the following options may be included (Option) ⁇
  • the number of PSS sequences is determined to be two.
  • the ZC sequence with the root sequence ⁇ 25, 29 ⁇ is selected as the primary synchronization cell ⁇ .
  • select 168 groups of cells ⁇ select 168 groups of cells ⁇ , and select the WID-168 group cells in the primary synchronization cell with the root sequence ⁇ 25 ⁇ .
  • Option2 determine the number of PSS sequences is 2.
  • the ZC sequence with the root sequence ⁇ 25, 29 ⁇ is selected as the primary synchronization cell ⁇ .
  • select 168 groups of cells ⁇ select 168 groups of cells ⁇ , and select the WID-168 group cells in the primary synchronization cell with the root sequence ⁇ 29 ⁇ .
  • the ZC sequence with the root sequence ⁇ 34, 29 ⁇ is selected as the primary synchronization cell ⁇ .
  • select 168 groups of cells ⁇ select the WID-168 group of cells in the primary synchronization cell with the root sequence of ⁇ 34 ⁇ .
  • the ZC sequence with the root sequence ⁇ 34, 29 ⁇ is selected as the primary synchronization cell ⁇ .
  • select 168 groups of cells ⁇ In the primary synchronization cell with the root sequence of ⁇ 34 ⁇ , select 168 groups of cells ⁇ , and in the primary synchronization cell with the root sequence of ⁇ 29 ⁇ , select the WID-168 group of cells ⁇ .
  • the ZC sequence with the root sequence ⁇ 25, 34 ⁇ is selected as the primary synchronization cell ⁇ .
  • select 168 groups of cells ⁇ select the WID-168 group cells in the primary synchronization cell with the root sequence of ⁇ 34 ⁇ .
  • the ZC sequence with the root sequence ⁇ 25, 34 ⁇ is selected as the primary synchronization cell ⁇ .
  • select 168 groups of cells ⁇ select the WID-168 group cells in the primary synchronization cell with the root sequence ⁇ 25 ⁇ .
  • the method is applied to an M2M system.
  • the synchronization channel of the M2M system needs to meet the requirements of wide coverage and large capacity, and needs to be in a narrowband system (for example, the system bandwidth is less than Working under 1.4MNHz). Therefore, the synchronization sequence needs to be mapped within a narrower system bandwidth.
  • the PSS sequence and the SSS sequence of length 62 are mapped to the bandwidth center, and the subcarrier spacing needs to be less than 15 kHz.
  • the subcarrier spacing can be below ⁇ or below 5 kHz.
  • the subcarrier spacing of the PSS sequence and the SSS sequence mapped to the frequency resource is 2.5 KHz.
  • the product of a and b is less than 504, that is, the total physical layer cell identifier PCI number in the system is smaller than that in the conventional LTE system. 504, in this way, synchronization is reduced, synchronization time and resource overhead can be reduced.
  • the subcarrier spacing of the PSS sequence and the SSS sequence mapped to the frequency resource needs to be less than 15 kHz, which is suitable for a narrowband M2M communication system.
  • Embodiment 2 Referring to FIG. 4, another LTE synchronization method according to an embodiment of the present invention includes:
  • the base station device selects a group intra-group number from the three intra-group numbers of the physical layer cell identifier PCI packet of the LTE system, and forms a PSS sequence candidate set corresponding to the primary synchronization signal PSS sequence corresponding to the intra-group number.
  • a is a positive integer less than or equal to 3;
  • the base station device selects b from 168 physical layer d and area identifier PCI packets of the LTE system.
  • the secondary synchronization signal SSS sequence corresponding to the b PCI packets is formed into an SSS sequence candidate set, b is a positive integer less than or equal to 168, and the product of a and b is less than 504;
  • step 210 may include: selecting all three intra-group numbers of the LTE system.
  • step 220 may include: selecting b PCI packets from the 168 PCI packets at intervals of c minus one, c equals 168/b rounding down; or, selecting the first b of the 168 PCI packets PCI grouping.
  • step 210 may include: selecting any one of the three intra-group numbers of the LTE system.
  • Step 220 may include: selecting the first b PCI packets of the 168 PCI packets, b being equal to the number of PCIs N, and N being a positive integer less than or equal to 168.
  • step 210 may include: selecting any two intra-group numbers in the three intra-group numbers of the LTE system.
  • Step 220 may include: selecting the first b PCI packets in the 168 PCI packets, where b is equal to N/2 if the number of PCIs N is an even number; and n is equal to N/2 if the number of PCIs N is an odd number Round up, N is a positive integer less than or equal to 336.
  • step 210 may include: selecting any two intra-group numbers in the three intra-group numbers of the LTE system.
  • Step 220 may include: for the selected first intra-group number, the base station device selects a secondary synchronization signal SSS sequence corresponding to all 168 PCI packets of the LTE system, and forms a first SSS corresponding to the first intra-group number.
  • the base station device selects a secondary synchronization signal SSS sequence corresponding to d PCI packets from 168 PCI packets of the LTE system, and the composition corresponds to the second group
  • the subcarrier spacing of the PSS sequence and the SSS sequence mapped to the frequency resource is less than 15 kHz.
  • the LTE synchronization method provided by the present invention is described from the base station device side.
  • the base station device side introduces the LTE synchronization method of the present invention.
  • the product of a and b is less than 504, that is, the total physical layer cell identifier PCI number in the system is smaller than that in the conventional LTE system. 504, in this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced.
  • the PSS sequence and the SSS sequence are mapped to subcarriers of the frequency resource The interval needs to be less than 15KHz, which is suitable for narrowband M2M communication systems.
  • an embodiment of the present invention provides a user equipment 500, which may include:
  • the first detecting module 510 is configured to detect a primary synchronization signal PSS sequence, and cyclically correlate the PSS sequence with a type of ZC sequence included in the ZC sequence set, and obtain a number of the PSS sequence, where a is less than or equal to 3. Positive integer
  • the second detecting module 520 is configured to detect a sequence of the secondary synchronization signal SSS, and cyclically correlate the SSS sequence with the b types of M sequences included in the M sequence set, and obtain the number of the SSS sequence, where b is less than or equal to 168. a positive integer, and the product of a and b is less than 504;
  • the synchronization module 530 is configured to perform synchronization by using the detected PSS sequence and the SSS sequence, where the physical layer cell identifier PCI is determined according to the number of the PSS sequence and the number of the SSS sequence.
  • the M sequence set includes: an SSS sequence corresponding to b PCI packets selected from 168 physical layer cell identifier PCI packets of the LTE system with c minus 1 as an interval, and c equals 168/ b rounding down; or, the SSS sequence corresponding to the first b PCI packets selected from the 168 PCI packets of the LTE system.
  • the ZC sequence set includes: a PSS sequence corresponding to any one of the three intra-group numbers of the LTE system; the M sequence set includes: 168 PCI packets of the LTE system The first b PCI packets correspond to the SSS sequence.
  • the ZC sequence set includes: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system; the M-sequence set includes: 168 LTE systems The SSS sequence corresponding to the first b PCI packets in the PCI packet.
  • the ZC sequence set includes: a PSS sequence corresponding to any two intra-group numbers in the three intra-group numbers of the LTE system;
  • the correlation includes: determining a subset of M sequences corresponding to the detected PSS sequence, and cyclically correlating the SSS sequence with the M sequence included in the subset of the M sequences.
  • the subcarrier spacing of the PSS sequence and the SSS sequence mapped to the frequency resource is less than 15 kHz.
  • the user equipment in the embodiment of the present invention may be, for example, a mobile phone, an IPAD, or the like.
  • the user equipment may be used to perform the LTE synchronization method provided in the first embodiment, or the functions of the respective functional modules of the user equipment may be implemented according to the LTE synchronization method provided in the first embodiment.
  • the functions of the respective functional modules of the user equipment may be implemented according to the LTE synchronization method provided in the first embodiment.
  • an embodiment of the present invention provides a base station device 600, which may include:
  • the first selection module 610 is configured to select a type of intra-group number from the three intra-group numbers of the physical layer cell identifier PCI packet of the LTE system, and form a PSS sequence of the primary synchronization signal PSS sequence corresponding to the intra-group number
  • a is a positive integer less than or equal to 3;
  • the second selection module 620 is configured to select, from the 168 physical layer cell identifier PCI packets of the LTE system. Selecting b PCI packets, the secondary synchronization signal SSS sequence corresponding to the b PCI packets is formed into an SSS sequence candidate set, b is a positive integer less than or equal to 168, and the product of a and b is less than 504;
  • the sending module 630 is configured to send a PSS sequence from the PSS sequence candidate set to the user equipment, and select an SSS sequence from the SSS sequence candidate set to send to the user equipment, so that the user equipment passes the detection
  • the PSS sequence is synchronized with the SSS.
  • the first selection module 610 is specifically configured to select all three intra-group numbers of the LTE system
  • the second selection module 620 is specifically configured to use the c minus 1 interval to Among the 168 PCI packets, b PCI packets are selected, c is equal to 168/b rounded down; or, the first b PCI packets of the 168 PCI packets are selected.
  • the first selection module 610 is specifically configured to select any one of the three intra-group numbers of the LTE system; the second selection module 620 is specifically configured to select the The first b PCI packets out of 168 PCI packets, b equals the number of PCIs N, and N is a positive integer less than or equal to 168.
  • the first selecting module 610 is specifically configured to select any two intra-group numbers in the three intra-group numbers of the LTE system; the second selecting module 620 is specifically configured to select the The first b PCI packets of 168 PCI packets, wherein if the number of PCIs N is even, b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2, and N is less than or A positive integer equal to 336.
  • the first selection module 610 is specifically configured to select any two intra-group numbers in the three intra-group numbers of the LTE system
  • the second selection module 620 is specifically configured to select The first intra-group number
  • the base station device selects a secondary synchronization signal SSS sequence corresponding to all 168 PCI packets of the LTE system, and forms a first SSS sequence candidate set corresponding to the first intra-group number
  • the second intra-group number is selected, and the base station device selects a secondary synchronization signal SSS sequence corresponding to the d PCI packets from the 168 PCI packets of the LTE system, and forms a second SSS sequence candidate corresponding to the second intra-group number.
  • Set, d N-168
  • N is the number of PCIs
  • N is a positive integer greater than 168 but less than or equal to 336.
  • the subcarrier spacing of the PSS sequence and the SSS sequence mapped to the frequency resource is less than 15 kHz.
  • the user equipment in the embodiment of the present invention can be used to perform the LTE synchronization provided in the second embodiment.
  • the method, or the function of each function module of the user equipment in the embodiment of the present invention may be specifically implemented according to the LTE synchronization method provided in the second embodiment, and the specific implementation process may refer to the related description in the foregoing method embodiment, where the description is no longer Narration.
  • the product of a and b is less than 504, that is, the total physical layer cell identifier PCI number in the system is smaller than the conventional one. 504 in the LTE system, so that synchronization is reduced, synchronization time is reduced, and synchronization time and resource overhead can be reduced.
  • the subcarrier spacing of the PSS sequence and the SSS sequence mapped to the frequency resource needs to be less than 15 kHz, which is suitable for a narrowband M2M communication system.
  • the embodiment of the present invention further provides a wireless communication system, as shown in FIG.
  • an embodiment of the present invention further provides a user equipment 700, where the user equipment includes a processor 701, a memory 702, a bus 703, and a communication interface 704.
  • the memory 702 is configured to store computer execution instructions
  • the processor 701 is connected to the memory 702 via the bus 703, and when the user equipment is running, the processor 701 executes the The computer executes instructions to cause the user equipment to perform the LTE synchronization method as shown in the first embodiment (ie, the embodiment of FIG. 3).
  • the embodiment of the present invention further provides a base station device 800, where the base station device includes a processor 801, a memory 802, a bus 803, and a communication interface 804;
  • the memory 802 is configured to store computer execution instructions
  • the processor 801 is coupled to the memory 802 via the bus 803, and when the controller is running, the processor 801 executes the memory stored by the memory 802.
  • the computer executes the instructions to cause the base station device to perform the LTE synchronization method as shown in the second embodiment (i.e., the embodiment of FIG. 4).
  • the embodiment of the present invention further provides a computer storage medium, including a computer executing instructions, when the processor of the computer executes the computer execution instruction, the computer executes the LTE as shown in the first embodiment (ie, the embodiment of FIG. 3) Synchronization method.
  • the embodiment of the present invention further provides a computer storage medium, including a computer execution instruction, when the processor of the computer executes the computer execution instruction, the computer executes the LTE as shown in the second embodiment (ie, the embodiment of FIG. 4) Synchronization method.
  • a computer storage medium including a computer execution instruction, when the processor of the computer executes the computer execution instruction, the computer executes the LTE as shown in the second embodiment (ie, the embodiment of FIG. 4) Synchronization method.
  • the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment can be referred to the related descriptions of other embodiments.
  • the present invention is not limited by the described action sequence, because In accordance with the present invention, certain steps may be performed in other sequences or concurrently.
  • the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: ROM, RAM, disk or CD, etc.

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

Abstract

L'invention concerne un procédé de synchronisation LTE, ainsi qu'un dispositif et un système associés, permettant de réduire la complexité de synchronisation d'équipements utilisateur et de réduire le temps et les ressources excessives de synchronisation. Dans certains modes de réalisation possibles de l'invention, le procédé consiste : pour un équipement utilisateur à détecter une séquence de signaux de synchronisation primaires (PSS), effectuer une corrélation itérative sur a types de séquences ZC contenues dans l'ensemble constitué par la séquence PSS et la séquence ZC, et obtenir un numéro de série de la séquence PSS, a étant un entier positif inférieur ou égal à 3; l'équipement utilisateur détecte une séquence de signaux de synchronisation secondaires (SSS), effectue une corrélation itérative sur b types de séquences M contenues dans un ensemble constitué par la séquence SSS et la séquence M, et obtient un numéro de série de la séquence SSS, b étant un entier positif inférieur ou égal à 168, le produit d'a et b étant inférieur à 504; à effectuer la synchronisation au moyen de la séquence PSS et de la séquence SSS détectées et déterminer une identité de cellule de couche physique (PCI) en fonction du numéro de série de la séquence PSS et du numéro de série de la séquence SSS.
PCT/CN2014/081652 2014-07-04 2014-07-04 Procédé de synchronisation lte et dispositif et système associés WO2016000258A1 (fr)

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