CN105409301B - LTE synchronous method and relevant device and system - Google Patents

Abstract

A kind of LTE synchronous method and relevant device and system reduce synchronous time overhead and resource overhead for reducing the synchronization complexity of UE.In some feasible embodiments of the present invention, method includes: user equipment detection primary synchronization signal PSS sequence, the PSS sequence done to a kind ZC sequence included by ZC arrangement set to circulation is related, obtains the number of the PSS sequence, a is the positive integer less than or equal to 3；User equipment detects secondary synchronization signal SSS sequence, and the SSS sequence done to b kind M sequence included by M sequence set to circulation is related, obtains the number of the SSS sequence, b is the positive integer less than or equal to 168, and the product of a and b is less than 504；It is synchronized using the PSS sequence and the SSS sequence that detect, wherein physical-layer cell identifier PCI is determined according to the number of the number of the PSS sequence and the SSS sequence.

Description

LTE synchronization method and related equipment and system

technical field

The present invention relates to the field of communication technologies, in particular to an LTE synchronization method and related equipment and systems.

Background technique

In recent years, the rapid development of wireless networks has promoted the rapid expansion of M2M (machine to machine communication, machine-to-machine communication) communication, and M2M business has also expanded to fields such as automotive telecommunications, consumer electronics, fleet management, and smart metering. At present, various M2M communication systems with low power consumption, low cost, wide coverage and flexible deployment are research hotspots. The evolution technology of various communication standards has naturally become the first choice of the M2M system. Considering characteristics such as system scheduling flexibility, evolution based on LTE (Long term evolution, long term evolution) is a hot candidate technology.

To access an LTE cell, an existing UE (User Equipment, user equipment) must first perform a cell search through a synchronization channel. At the physical layer, the cell search includes a series of synchronization stages to obtain time synchronization and frequency synchronization. Among them, a large number of blind searches are required in the synchronization phase, so the time overhead and resource overhead of synchronization are huge. However, in resource-constrained scenarios such as narrowband M2M communication, for example, in low-cost UE chip communication, it is particularly necessary to optimize the time and resource overhead of the synchronization channel.

SUMMARY OF THE INVENTION

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 overhead 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, performs cyclic correlation between the PSS sequence and a type of 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; the user equipment detects Secondary synchronization signal SSS sequence, cyclically correlate the SSS sequence with b types of M sequences included in the M sequence set, and obtain the number of the SSS sequence, where b is a positive integer less than or equal to 168, and the product of a and b less than 504; use the detected PSS sequence and the SSS sequence to perform synchronization, wherein the physical layer cell identifier PCI is determined according to the number of the PSS sequence and the number of the SSS sequence.

With reference to the first aspect, in a first possible implementation manner, the M sequence set includes: corresponding to b PCI packets selected at an interval of c minus 1 from 168 physical layer cell identifier PCI packets in the LTE system 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.

With reference to the first aspect, in a second possible implementation manner, 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: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system.

With reference to the first aspect, in a third possible implementation manner, the ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set includes: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system.

With reference to the first aspect, in a fourth possible implementation manner, the ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set includes: Two M-sequence subsets corresponding to the two PSS sequences in the ZC sequence set respectively, wherein one M-sequence subset includes SSS sequences corresponding to all 168 PCI packets of the LTE system, and the other M-sequence subset includes LTE SSS sequences corresponding to d PCI packets in the system, 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 cyclic correlation of the included b types of M sequences includes: determining a subset of M sequences corresponding to the detected PSS sequences, and performing cyclic correlation between the SSS sequences and the M sequences included in the subset of M sequences.

With reference to the first aspect or any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner, the PSS sequence and the SSS sequence are mapped to the frequency resource The subcarrier spacing is less than 15KHz.

A second aspect of the present invention provides an LTE synchronization method, comprising:

The base station equipment selects a kind of intra-group number from the three kinds of intra-group numbers of the physical layer cell identification PCI group of the LTE system, and forms a PSS sequence candidate set with the primary synchronization signal PSS sequence corresponding to the a kind of intra-group number, where a is A positive integer less than or equal to 3; the base station equipment selects b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system, and forms the SSS sequence candidates with the secondary synchronization signal SSS sequences corresponding to the b PCI groups set, b is a positive integer less than or equal to 168, the product of a and b is less than 504; the base station equipment selects a PSS sequence from the PSS sequence candidate set and sends it to the user equipment, and selects a PSS sequence from the SSS sequence candidate One SSS sequence is collectively selected and sent to the user equipment, so that the user equipment can synchronize with the SSS by detecting the PSS sequence.

With reference to the second aspect, in a first possible implementation manner, the base station device selecting a type of intra-group numbering from three types of intra-group numbers in the physical layer cell identifier PCI group of the LTE system includes: selecting all three types of intra-group numbers in the LTE system. Intra-group numbering; the base station equipment selecting b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system includes: selecting b PCI groups from the 168 PCI groups at an interval of c minus 1, c is equal to 168/b rounded down; alternatively, the first b PCI packets among the 168 PCI packets are selected.

With reference to the second aspect, in a second possible implementation manner, the base station device selecting a type of intra-group numbering from the three types of intra-group numbers in the physical layer cell identifier PCI group of the LTE system includes: selecting three types of intra-group numbers in the LTE system Any one of the intra-group numbers; the base station device selecting b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system includes: selecting the first b PCI groups in the 168 PCI groups , b is equal to the number of PCIs N, where N is a positive integer less than or equal to 168.

With reference to the second aspect, in a third possible implementation manner, the base station device selecting a type of intra-group numbering from the three types of intra-group numbers of the physical layer cell identifier PCI group of the LTE system includes: selecting three types of intra-group numbers in the LTE system Any two kinds of intra-group numbers in the group number; the base station device selecting b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system includes: selecting the first b PCI groups in the 168 PCI groups , where if the number of PCIs N is an even number, b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2 rounded up, and N is a positive integer less than or equal to 336.

With reference to the second aspect, in a fourth possible implementation manner, the base station device selecting a type of intra-group numbering from the three intra-group numbers of the physical layer cell identifier PCI group of the LTE system includes: selecting three types of intra-group numbers in the LTE system Any two intra-group numbers in the group number; the base station equipment selects b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system, and forms the secondary synchronization signal SSS sequences corresponding to the b PCI groups. The SSS sequence candidate set includes: for the selected first type of intra-group numbering, the base station device selects the SSS sequences of the secondary synchronization signals corresponding to all 168 PCI groups of the LTE system to form the first type corresponding to the first type of intra-group numbering. A candidate set of SSS sequences; for the selected second group number, the base station device selects d SSS sequences corresponding to the PCI groups from 168 PCI groups in the LTE system, forming the SSS sequences corresponding to the second group The second candidate set of SSS sequences numbered in the group, 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.

With reference to the second aspect or any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner, the PSS sequence and the SSS sequence are mapped to the frequency resource The subcarrier spacing is less than 15KHz.

A third aspect of the present invention provides a user equipment, including:

The first detection module is used to detect the PSS sequence of the primary synchronization signal, and cyclically correlate the PSS sequence with a ZC sequence included in the ZC sequence set, and obtain the number of the PSS sequence, where a is a positive number less than or equal to 3. Integer; the second detection module is used to detect the SSS sequence of the secondary synchronization signal, 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 is a positive integer, and the product of a and b is less than 504; a synchronization module is used to synchronize 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.

With reference to the third aspect, in a first possible implementation manner, the M-sequence set includes: corresponding to b PCI packets selected at an interval of c minus 1 from 168 physical layer cell identifier PCI packets in the LTE system 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.

With reference to the third aspect, in a second possible implementation manner, 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: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system.

With reference to the third aspect, in a third possible implementation manner, the ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set includes: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system.

With reference to the third aspect, in a fourth possible implementation manner, the ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set includes: Two M-sequence subsets corresponding to the two PSS sequences in the ZC sequence set respectively, wherein one M-sequence subset includes SSS sequences corresponding to all 168 PCI packets of the LTE system, and the other M-sequence subset includes LTE SSS sequences corresponding to d PCI packets in the system, 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 cyclic correlation of the included b types of M sequences includes: determining a subset of M sequences corresponding to the detected PSS sequences, and performing cyclic correlation between the SSS sequences and the M sequences included in the subset of M sequences.

With reference to the third aspect or any one of the first to fourth possible implementation manners of the third aspect, in a fifth possible implementation manner, the PSS sequence and the SSS sequence are mapped to frequency resources. The subcarrier spacing is less than 15KHz.

A fourth aspect of the present invention provides a base station device, including:

The first selection module is used to select a kind of intra-group number from the three kinds of intra-group numbers of the physical layer cell identification PCI grouping of the LTE system, and form the PSS sequence corresponding to the primary synchronization signal PSS sequence of the a kind of intra-group number to prepare a PSS sequence. Selected set, a is a positive integer less than or equal to 3; the second selection module is used to select b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system, and synchronize the corresponding auxiliary synchronization of the b PCI groups The signal SSS sequence forms 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 used to select a PSS sequence from the PSS sequence candidate set and send it to the user equipment, And, select one SSS sequence from the candidate set of SSS sequences and send it to the user equipment, so that the user equipment can synchronize with the SSS by detecting the PSS sequence.

With reference to the fourth aspect, in a first possible implementation manner, the first selection module is specifically used to select all three intra-group numbers of the LTE system; the second selection module is specifically used to subtract c from c 1 is an interval to select b PCI groups from the 168 PCI groups, and c is equal to 168/b rounded down; or, select the first b PCI groups in the 168 PCI groups.

With reference to the fourth aspect, in a second possible implementation manner, the first selection module is specifically configured to select any one of the three intra-group numbers of the LTE system; the second selection module, Specifically, it is used to select the first b PCI groups in the 168 PCI groups, where b is equal to the number N of PCIs, and N is a positive integer less than or equal to 168.

With reference to the fourth aspect, in a third possible implementation manner, the first selection module is specifically configured to select any two intra-group numbers among the three types of intra-group numbers in the LTE system; the second selection module, Specifically, it is used to select the first b PCI groups in the 168 PCI groups, wherein, if the number of PCIs N is an even number, b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2 taken upwards Integer, N is a positive integer less than or equal to 336.

With reference to the fourth aspect, in a fourth possible implementation manner, the first selection module is specifically configured to select any two intra-group numbers among the three types of intra-group numbers in the LTE system; the second selection module, Specifically, for the selected first type of intra-group numbering, the base station equipment selects the SSS sequences of the secondary synchronization signals corresponding to all 168 PCI groups in the LTE system to form a first SSS sequence corresponding to the first type of intra-group numbering. Selected set; for the selected second group number, the base station equipment selects d PCI groupings from the 168 PCI groups in the LTE system. The corresponding SSS sequences of the secondary synchronization signals are formed to correspond 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.

With reference to the fourth aspect or any one of the first to fourth possible implementation manners of the fourth aspect, in a fifth possible implementation manner, the PSS sequence and the SSS sequence are mapped to the frequency resource The subcarrier spacing is less than 15KHz.

A fifth aspect of the present invention provides a wireless communication system, including: the user equipment provided in the third aspect of the present invention, and the base station device provided in the fourth aspect of the present invention.

A sixth aspect of the present invention provides a user equipment, the user equipment includes a processor, a memory, a bus, and a communication interface; the memory is used to store computer execution instructions, and the processor and the memory are connected through the bus, When the user equipment is running, the processor executes the computer-executable instructions stored in the memory, so that the user equipment executes the LTE synchronization method according to the first aspect of the present invention.

A seventh aspect of the present invention provides a base station device, the base station device includes a processor, a memory, a bus, and a communication interface; the memory is used to store computer execution instructions, and the processor and the memory are connected through the bus, When the user equipment is running, the processor executes the computer-executable instructions stored in the memory, so that the user equipment executes the LTE synchronization method according to the second aspect of the present invention.

An eighth aspect of the present invention provides a computer storage medium, comprising computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes the LTE synchronization method according to the first aspect of the present invention.

A ninth aspect of the present invention provides a computer storage medium, comprising computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes the LTE synchronization method according to the second aspect of the present invention.

It can be seen from the above that in the technical solution of the embodiment of the present invention, there are a types of PSS sequences and b types of SSS sequences, and the product of a and b is less than 504, that is, the total number of physical layer cell identifiers PCI in the system is less than There are 504 in the conventional LTE system. In this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced.

Description of drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments and the prior art. Obviously, the drawings in the following description are only some implementations of the present invention. For example, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention;

2 is a schematic flow chart of LTE synchronization and cell search;

3 is a schematic flowchart of an LTE synchronization method provided by an embodiment of the present invention;

4 is a schematic flowchart of another LTE synchronization method provided by an embodiment of the present invention;

5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

6 is a schematic structural diagram of a base station device according to an embodiment of the present invention;

7 is a schematic structural diagram of another user equipment provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another base station device provided by an embodiment of the present invention.

Detailed ways

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 overhead and resource overhead of synchronization.

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the following, a brief introduction is made to the synchronization technology of the LTE system first.

LTE defines a total of 504 different physical layer cell IDs (Physical Cell ID, PCI), these 504 PCI correspond to the LTE physical layer protocol 36.211 in the The value ranges from 0 to 503. Each PCI corresponds to a specific downlink reference signal sequence. The set of all PCIs is divided into 168 groups (corresponding to the The value ranges from 0 to 167), and each group contains 3 cell IDs (corresponding to the The value ranges from 0 to 2). PCI is numbered by group and group number Co-determination, PCI number

The synchronization of LTE includes two processes of primary synchronization and secondary synchronization, and two downlink synchronization signals are defined:

A primary synchronization signal (Primary Synchronization Signal, PSS) and a secondary synchronization signal (Secondary Synchronization Signal, SSS).

In the frame format of LTE FDD (Frequency Division Duplex), the PSS is mapped to the last OFDM (Orthogonal Frequency Division Multiplexing) symbol of the first slot (slot) of subframes 0 and 5, that is, the first Time slot and the 7th OFDM symbol of the 11th time slot; SSS and PSS are mapped in the same subframe and sent in the same time slot, but SSS is one OFDM symbol ahead of PSS, that is, SSS is mapped in the 1st time slot and the 11th time slot 6th symbol of a slot.

In the frame format of LTE TDD (Time Division Duplex), PSS is mapped in the third OFDM symbol of subframes 1 and 6 (ie DwPTS); while SSS is mapped in the last OFDM symbol of subframes 0 and 5 , 3 OFDM symbols ahead of PSS.

In the frequency domain, both PSS and SSS occupy 72 subcarriers in the center of the channel, of which 62 subcarriers in the center of the bandwidth are used, and 5 subcarriers are reserved on both sides as guard bands. The UE will try to receive PSS and SSS near the center frequency of its supported LTE bandwidth.

PSS uses a ZC (Zadoff-Chu) sequence with a length of 63 (there is a DC subcarrier in the middle, so the actual transmission length is 62), plus the additional 5 subcarriers reserved for the guard band on the border, forming the occupied bandwidth PSS for the center 72 subcarriers. PSS has 3 values, corresponding to three different Zadoff-Chu sequences, each sequence corresponds to a PCI group number The sequence corresponding to the PSS of a certain cell is determined by the PCI of the cell.

As shown in Table 1, different Corresponding to different root sequence index values (Root index u), and then determine different ZC sequences.

Table 1

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's Since the position of the PSS in the time domain is fixed, the UE can obtain the 5ms timing of the cell. Since there are two PSSs in a 10ms system frame, and the two PSS sequences are the same, the UE does not know whether the PSS solved is the PSS sequence of the first 5ms or the PSS sequence of the last 5ms, so only the 5ms timing can be obtained. ).

SSS is a sequence of length 62 obtained by the cross-concatenation of two M sequences of length 31, similar to PSS, plus the additional 5 subcarriers reserved for the guard band at the border, forming 72 subcarriers occupying the center of the bandwidth SSS. In a system frame, the SSS cross-concatenation method of the first half frame is opposite to that of the second half frame. Among them, each M sequence can take 31 different values, which are actually 31 different offsets of the same M sequence.

As shown in Table 2, the 168 SSS sequences pass the offset sequence (m0, m1) and the PCI group number respectively correspond.

Table 2

In the LTE system, after the UE detects the PSS, it knows the possible locations of the SSS (if the UE supports both FDD and TDD, there are at most 4 locations). When the UE detects and successfully decodes the SSS, it determines one of the 168 values in Table 2, and also determines the PCI group number. Furthermore, the PCI number is determined,

In addition, according to the cross-cascading method of the SSS, it can be determined whether the SSS is located in subframe 0 or subframe 5, and then the position of subframe 0 in the system frame is determined, that is, 10ms timing (timing), so as to realize the frame Synchronize. In addition, through the position where the SSS appears, it can be determined which working mode of FDD and TDD is operated.

It can be seen from the above that in the LTE synchronization process, the primary synchronization process is performed first. During the primary synchronization process, the UE uses three different sets of local ZC sequences to cyclically correlate the received PSS sequences, and the number of the PSS sequences is determined by the correlation peak. Complete time domain synchronization. Then perform secondary synchronization. During the secondary synchronization process, the UE uses 168 different local M sequences to perform cyclic correlation with the received SSS sequences, and the correlation peak determines the number of the SSS sequence selected by the base station equipment at the transmitting end. Therefore, the UE performs synchronization using the detected PSS sequence and the SSS sequence, wherein the physical layer cell identity (PCI) can be determined according to the number of the PSS sequence and the number of the SSS sequence, and the PCI number

To sum up, the existing co-frequency network has a large number of LTE cells, reaching 504, and the auxiliary synchronization process needs to do 168 correlation comparisons, which makes the terminal complex, and the time and resource overhead are relatively large. Reducing power consumption and cost is disadvantageous. In addition, in the existing LTE system, the subcarrier spacing is 15KHz, and the system bandwidth is at least 1.4MHz, that is, the LTE synchronization channel design can only be applied to systems with a system bandwidth greater than 1.4MHz. However, in the current narrowband M2M communication system, the subcarrier spacing is less than 15KHz, and the system bandwidth is less than 1.4MHz. If the initial frequency offset is relatively large, a frequency grid search is required, which greatly increases the complexity of the UE receiving algorithm. , we need to simplify the existing synchronization channel to meet the narrowband M2M system.

In order to solve the above problems, embodiments of the present invention provide an LTE synchronization method and related devices and systems, which are described in detail below with reference to the accompanying drawings.

The technical solutions of the embodiments of the present invention are applied to a wireless communication system. As shown in FIG. 1 , the wireless communication system includes: user equipment 100 and base station equipment 200 . The wireless communication system is an LTE system, specifically an LTE-based M2M communication system, or other LTE-based communication systems, which are not limited herein.

The base station equipment is used to provide an LTE cell, and can send the primary synchronization signal PSS through the primary synchronization channel (P-SCH), and send the secondary synchronization signal SSS through the secondary synchronization channel (S-SCH). User Equipment (UE) can synchronize with the LTE cell by detecting PSS and SSS, and then access the LTE cell.

As shown in FIG. 2 , it is a schematic diagram of LTE synchronization and cell search.

First, the UE detects the P-SCH on several center frequency points that may exist in the LTE cell, and receives the PSS sequence; after the detection of the PSS sequence is successful, it detects the S-SCH and receives the SSS sequence at the possible location; therefore, according to the PSS sequence The number and the number of the SSS sequence determine the PCI of the physical layer cell, and complete the 5ms timing and 10ms timing to achieve frame synchronization.

Then, the UE can further receive the downlink reference signal (DL_RS) sent by the base station to achieve more precise synchronization between the time slot and the frequency.

Then, the UE can perform a cell search, and by receiving the PBCH (Physical Broadcast Channel, physical broadcast channel) signal sent by the base station, extract the MIB (Master Information Block, master information block) carried in it, and obtain some system information, such as downlink system bandwidth, PHICH configuration, antenna number, system frame number (System Frame Number, SFN), etc.;

Finally, the PDSCH (Physical Downlink Shared Channel) signal sent by the base station is received, sufficient SIB (System Information Type, system information type) messages are obtained, the cell search is completed, and the searched LTE cell is accessed.

Example 1

Referring to FIG. 3, an embodiment of the present invention provides a long-term evolution LTE synchronization method, which may include:

110. The user equipment detects the PSS sequence of the primary synchronization signal, performs cyclic correlation between the PSS sequence and a type of 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.

In the embodiment of the present invention, the terminal synchronization complexity of the M2M system is reduced by reducing the number of physical layer cells for multiplexing of synchronization sequences. That is, by reducing the three types of PSS sequences in the existing LTE system to two or one, or by reducing 168 types of SSS sequences, the total number of PCIs can be reduced. For example, in some embodiments, the PSS sequence may not be reduced, but only the SSS sequence may be reduced; in other embodiments, the PSS sequence and the SSS sequence may be simultaneously reduced.

In this embodiment of the present invention, a type of PSS sequence can be arbitrarily selected from the three types of PSS sequences corresponding to the three types of intra-group numbers in the LTE system, where a is 1, 2 or 3, and the selected type a of PSS sequences are formed into a set. The PSS sequence used in the LTE system is specifically a ZC sequence. On the side of the user equipment, the set composed of the a type of PSS sequences may be called a ZC sequence set. After detecting the PSS sequence, the user equipment may perform a cyclic correlation between the received PSS sequence and a type of ZC sequence included in the local ZC sequence set, and obtain the number of the detected PSS sequence. In this embodiment, in the main synchronization process, only a cyclic correlation needs to be performed. When a is less than 3, the complexity of the main synchronization can be reduced, and the time and resource overhead can be reduced.

120. The user equipment detects the SSS sequence of the secondary synchronization signal, performs cyclic correlation between the SSS sequence and b types of M sequences included in the M sequence set, and obtains the 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.

In this embodiment of the present invention, b types can be arbitrarily selected from 168 types of SSS sequences corresponding to 168 PCI groups in the LTE system, where b is a positive integer less than or equal to 168, and the selected b types of SSS sequences are formed into a set. The SSS sequence used in the LTE system is specifically the M sequence, and on the side of the user equipment, the set composed of the b types of SSS sequences may be called the M sequence set. After detecting the SSS sequence, the user equipment may perform a cyclic correlation between the received SSS sequence and b types of M sequences included in the local M sequence set, and obtain the number of the detected SSS sequence. In this embodiment, in the secondary synchronization process, only b cycles of cyclic correlation need to be performed. When b is less than 168, the complexity of the secondary synchronization can be reduced, and the time and resource overhead can be reduced.

In this embodiment, since the product of a and b is less than 504, a must be less than 3 or b is less than 168. Therefore, synchronization complexity and time and resource overhead can always be reduced.

130. Use the detected PSS sequence and the SSS sequence to perform synchronization, wherein the physical layer cell identifier PCI is determined according to the number of the PSS sequence and the number of the SSS sequence.

In the LTE system, the UE can complete 5ms timing according to the detected PSS sequence, and then complete 10ms timing according to the detected SSS sequence to achieve frame synchronization. In addition, 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 is the number of the detected SSS sequence, is the number of the detected PSS sequence.

It can be seen from the above that in the technical solution of the embodiment of the present invention, there are a types of PSS sequences and b types of SSS sequences, and the product of a and b is less than 504, that is, the total number of physical layer cell identifiers PCI in the system is less than There are 504 in the conventional LTE system. In this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced.

In some embodiments of the present invention, the three groups of ZC sequences of the primary synchronization can be kept unchanged, the number of M sequences of the secondary synchronization can be reduced, and the mapping relationship between the offset sequence of the secondary synchronization channel and the PCI group number can be redesigned.

In one embodiment, the M sequence set may include: SSS sequences corresponding to b PCI packets selected at an interval of c minus 1 from 168 physical layer cell identifier PCI packets of the LTE system, where c is equal to 168/b Round down.

Assuming that the number of cell IDs in the M2M system is N _ID , the number of numbers in the group is Then the number of groups is symbol Indicates rounded up. In this embodiment, it can be calculated At intervals of N _GAP -1, evenly in error! Reference source not found. , select the corresponding PCI packet offset sequence, where the symbol Indicates rounded down. The M sequence set is composed of the SSS sequences corresponding to the selected PCI packets. This means that the M2M system cell grouping number The corresponding offset sequence is consistent with the offset sequence corresponding to the cell grouping number of the existing LTE system.

by For example, that is, the number of PCI groups we need for secondary synchronization is 14, That is, from the original table 2, we select every 11 selected in turn It can be 0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 14 in total, as shown in the slash-filled part in Table 3. if Then select every 10 selected in turn Can be 0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 16 in total.

table 3

In another embodiment, the M sequence set may include: SSS sequences corresponding to the first b PCI packets selected from 168 PCI packets in the LTE system. If the first b of the 168 PCI packet sequences shown in Table 2 are selected, a total of 3b PCIs can be supported.

If the number of cell IDs in the M2M system is N _ID , the number of numbers in the group is Then the number of subgroup numbers is can be selected in order in Table 2 The offset sequences are used to map the group numbers, that is, the SSS sequences corresponding to the selected first b PCI packets form an M sequence set. Here, This means that the M2M system cell grouping number The corresponding offset sequence is consistent with the offset sequence corresponding to the cell grouping number of the existing LTE system. by For example, the SSS sequence corresponding to the first 14 PCI packets in the original Table 2 can be obtained, as shown in the slash-filled part in Table 4.

Table 4

In some embodiments of the present invention, the number of 3 groups of ZC sequences for primary synchronization can be reduced, and the number of M sequences for secondary synchronization can also be reduced, and the mapping relationship between secondary synchronization channel offset sequences and PCI group numbers can be redesigned.

In an embodiment, the ZC sequence set may include: PSS sequences corresponding to any one of the three intra-group numbers of the LTE system; the M-sequence set includes: 168 PCI groups in the LTE system. The SSS sequence corresponding to the first b PCI packets. 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 users in the cell, and can be supported according to the specific needs of the cell. The number of secondary synchronization cells in each group is determined. For example, it can be determined that the number of PSS is 1, the ZC sequence with the root sequence index value of {29} can be preferentially selected, and the number of SSS sequences is b. In this case, The 168 shown in Table 2 can be selected The first b in the set constitute the local M-sequence set. When b is equal to 14, the selection results are shown in Table 4. This embodiment is suitable for the case where the N _ID is less than or equal to 168, especially for the case where the N _ID is less than 31. When the N _ID is less than 31, the selected top N _ID The offset sequence (m ₀ , m ₁ ) of , will not repeat, which is easier to detect and identify.

In one embodiment, the ZC sequence set may include: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set may include: 168 PCI packets of the LTE system The SSS sequences corresponding to the first b PCI packets in . This embodiment is especially suitable for the case where N _ID is greater than or equal to 31 but less than or equal to 336. Details are as follows:

For the PSS sequence, it is determined that the number of PSS sequences is 2, and the ZC sequence with the root sequence index value of {25, 29} can be selected as the primary synchronization cell ID, or the ZC sequence with the root sequence of {29, 34} can be selected as the primary synchronization cell ID. For the synchronization cell ID, the ZC sequence whose root sequence is {25, 29} may also be selected as the primary synchronization cell ID.

For the SSS sequence, the SSS sequence corresponding to the first b PCI packets in Table 2 may be selected. Further, if the N _ID is an even number, the two groups of SSS sequences can each be allocated the first N/2 cells as SSS. If N _ID is odd, assignable for the first PSS sequence SSS cells Assignable for second PSS sequence SSS cells

In one embodiment, the ZC sequence set may include: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set may include: corresponding to the ZC sequences respectively. Two M-sequence subsets of the two PSS sequences in the set, wherein one M-sequence subset includes SSS sequences corresponding to all 168 PCI packets in the LTE system; the other M-sequence subset includes d PCI packets in the LTE system For the corresponding SSS sequence, 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. For example, when d is equal to 14, the selection results are shown in Table 4. Correspondingly, the cyclic correlation between the SSS sequence and the b types of M sequences included in the M sequence set may include: determining a subset of M sequences corresponding to the detected PSS sequence, and comparing the SSS sequence with the M sequence. The M sequences included in the sequence subset are cyclically correlated.

This embodiment is especially suitable for the case where the N _ID is greater than 168 but less than or equal to 336. Specifically, the following options can be included:

Option1: The number of PSS sequences is determined to be 2. Select the ZC sequence whose root sequence is {25, 29} as the primary synchronization cell In the primary synchronization cell whose root sequence is {29}, 168 groups of cells are selected In the primary synchronization cell whose root sequence is {25}, select N _ID -168 group of cells

Option 2: The number of PSS sequences is determined to be 2. Select the ZC sequence whose root sequence is {25, 29} as the primary synchronization cell In the primary synchronization cell whose root sequence is {25}, 168 groups of cells are selected In the primary synchronization cell whose root sequence is {29}, the N _ID -168 group of cells is selected

Option 3: The number of PSS sequences is determined to be 2. Select the ZC sequence whose root sequence is {34, 29} as the primary synchronization cell In the primary synchronization cell whose root sequence is {29}, 168 groups of cells are selected In the primary synchronization cell whose root sequence is {34}, the N _ID -168 group of cells is selected

Option 4: The number of PSS sequences is determined to be 2. Select the ZC sequence whose root sequence is {34, 29} as the primary synchronization cell In the primary synchronization cell whose root sequence is {34}, 168 groups of cells are selected In the primary synchronization cell whose root sequence is {29}, the N _ID -168 group of cells is selected

Option5: The number of PSS sequences is determined to be 2. Select the ZC sequence whose root sequence is {25, 34} as the primary synchronization cell In the primary synchronization cell whose root sequence is {25}, 168 groups of cells are selected In the primary synchronization cell whose root sequence is {34}, the N _ID -168 group of cells is selected

Option 6: The number of PSS sequences is determined to be 2. Select the ZC sequence whose root sequence is {25, 34} as the primary synchronization cell In the primary synchronization cell whose root sequence is {34}, 168 groups of cells are selected In the primary synchronization cell whose root sequence is {25}, select N _ID -168 group of cells

In some embodiments of the present invention, the method is applied to an M2M system. Since the synchronization channel of the M2M system needs to meet the requirements of wide coverage and large capacity, it needs to work in a narrowband system (for example, the system bandwidth is less than 1.4 MNHz). Therefore, the synchronization sequence needs to be mapped in a narrower system bandwidth. The PSS sequence and SSS sequence with a length of 62 are mapped to the center of the bandwidth, and the subcarrier spacing needs to be less than 15KHz. For example, the subcarrier spacing can be 10KHz or 5KHz or less. In an embodiment, the subcarrier interval at which the PSS sequence and the SSS sequence are mapped to frequency resources is 2.5KHz.

It can be understood that, the foregoing solutions in the embodiments of the present invention may be specifically implemented, for example, on user equipment, such as mobile phones and other devices.

In the above, the LTE synchronization method provided by the embodiment of the present invention has been described from the side of the user equipment. In the method according to the embodiment of the present invention, there are a types of PSS sequences and b types of SSS sequences, and the product of a and b is less than 504, that is, the total number of physical layer cell identifiers PCI in the system is less than 504 in the conventional LTE system In this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced. In a preferred embodiment, the subcarrier spacing between PSS sequences and SSS sequences mapped to frequency resources needs to be less than 15KHz, which is suitable for a narrowband M2M communication system.

To sum up, in the embodiment of the present invention, the following two points can be adopted: 1) a narrow system bandwidth can reduce the cost of the system and improve the uplink coverage; 2) fast synchronization with low complexity can reduce the overhead and greatly reduce the terminal cost Power consumption; therefore, suitable for M2M systems to achieve fast synchronization with low complexity within a narrower system bandwidth.

Embodiment 2

Please refer to FIG. 4 , another LTE synchronization method according to an embodiment of the present invention includes:

210. The base station equipment selects a kind of intra-group number from the three kinds of intra-group numbers of the physical layer cell identification PCI group of the LTE system, and forms a PSS sequence candidate set with the primary synchronization signal PSS sequence corresponding to the a kind of intra-group number, a is a positive integer less than or equal to 3;

220. The base station equipment selects b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system, and forms the SSS sequence candidate set with the secondary synchronization signal SSS sequences corresponding to the b PCI groups, where b is less than or A positive integer equal to 168, the product of a and b is less than 504;

230. The base station equipment selects a PSS sequence from the alternative set of PSS sequences and sends it to the user equipment, and selects an SSS sequence from the alternative set of SSS sequences and sends it to the user equipment, so that the user equipment can pass the detection of the selected SSS sequence. The PSS sequence and the SSS are synchronized.

In some embodiments of the present invention, 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 1, where c is equal to 168/b rounded down; or, selecting the first b of the 168 PCI packets PCI grouping.

In some embodiments of the present invention, 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 groups in the 168 PCI groups, where b is equal to the number N of PCIs, and N is a positive integer less than or equal to 168.

In some embodiments of the present invention, step 210 may include: selecting any two types of intra-group numbers among the three types of intra-group numbers of the LTE system. Step 220 may include: selecting the first b PCI groups in the 168 PCI groups, wherein if the number of PCIs N is an even number, b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2 Rounded up, N is a positive integer less than or equal to 336.

In some embodiments of the present invention, step 210 may include: selecting any two types of intra-group numbers among the three types of intra-group numbers of the LTE system. Step 220 may include: for the selected first intra-group numbering, the base station equipment selects the SSS sequences corresponding to all 168 PCI groups of the LTE system to form a first SSS corresponding to the first intra-group numbering Sequence candidate set; for the selected second group number, the base station device selects d secondary synchronization signal SSS sequences corresponding to PCI groups from 168 PCI groups in the LTE system, and forms a sequence corresponding to the second group. Numbered 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.

In some embodiments of the present invention, the subcarrier interval between which the PSS sequence and the SSS sequence are mapped to frequency resources is less than 15KHz.

It can be understood that, the above solutions in the embodiments of the present invention may be specifically implemented, for example, on a base station device.

This embodiment describes the LTE synchronization method provided by the present invention from the side of the base station device. For a more detailed description of this embodiment, please refer to the brief introduction to the synchronization technology of the LTE system above, the brief introduction to the wireless communication system shown in FIG. 1 and FIG. The user equipment side introduces the LTE synchronization method of the present invention.

In the method according to the embodiment of the present invention, there are a types of PSS sequences and b types of SSS sequences, and the product of a and b is less than 504, that is, the total number of physical layer cell identifiers PCI in the system is less than 504 in the conventional LTE system In this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced. In a preferred embodiment, the subcarrier spacing between PSS sequences and SSS sequences mapped to frequency resources needs to be less than 15KHz, which is suitable for a narrowband M2M communication system.

To sum up, in the embodiment of the present invention, the following two points can be adopted: 1) a narrow system bandwidth can reduce the cost of the system and improve the uplink coverage; 2) fast synchronization with low complexity can reduce the overhead and greatly reduce the terminal cost Power consumption; therefore, suitable for M2M systems to achieve fast synchronization with low complexity within a narrower system bandwidth.

In order to better implement the above solutions in the embodiments of the present invention, related devices for implementing the above solutions are also provided below.

Embodiment 3

Referring to FIG. 5, an embodiment of the present invention provides a user equipment 500, which may include:

The first detection module 510 is used for detecting the PSS sequence of the primary synchronization signal, performing a cyclic correlation between the PSS sequence and a kind of ZC sequence included in the ZC sequence set, and obtaining the number of the PSS sequence, where a is less than or equal to 3. positive integer;

The second detection module 520 is configured to detect the SSS sequence of the secondary synchronization signal, cyclically correlate the SSS sequence with 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 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.

In some embodiments of the present invention, the M sequence set includes: SSS sequences corresponding to b PCI packets selected at intervals of c minus 1 from 168 physical layer cell identifier PCI packets of the LTE system, where c is equal to 168/ b is rounded down; or, the SSS sequence corresponding to the first b PCI packets selected from the 168 PCI packets of the LTE system.

In some embodiments of the present invention, 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 groups in the LTE system The SSS sequence corresponding to the first b PCI packets.

In some embodiments of the present invention, the ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set includes: 168 PCI groups in the LTE system The SSS sequence corresponding to the first b PCI packets.

In some embodiments of the present invention, the ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; the M-sequence set includes: corresponding to the ZC sequence set respectively Two M-sequence subsets of the 2 PSS sequences in The SSS sequence, 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 SSS sequence and the b types of M sequences included in the M sequence set are cycled The correlation 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 M sequences.

In some embodiments of the present invention, the subcarrier interval between which the PSS sequence and the SSS sequence are mapped to frequency resources is less than 15KHz.

The user equipment in the embodiment of the present invention may be, for example, a mobile phone, an IPAD, and other devices.

It can be understood that the user equipment in this embodiment of the present invention can be used to execute the LTE synchronization method provided in the first embodiment, or in other words, the functions of each functional module of the user equipment in this embodiment of the present invention can be specifically implemented according to the LTE synchronization method provided in the first embodiment , and the specific implementation process may refer to the relevant descriptions in the foregoing method embodiments, which will not be repeated here.

It can be seen from the above that in the embodiment of the present invention, there are a types of PSS sequences and b types of SSS sequences, and the product of a and b is less than 504, that is, the total number of physical layer cell identifiers PCI in the system is smaller than that of conventional LTE. There are 504 in the system. In this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced. In a preferred embodiment, the subcarrier spacing between PSS sequences and SSS sequences mapped to frequency resources needs to be less than 15KHz, which is suitable for a narrowband M2M communication system.

Embodiment 4

Referring to FIG. 6, an embodiment of the present invention provides a base station device 600, which may include:

The first selection module 610 is used to select a type of intra-group number from three types of intra-group numbers of the physical layer cell identifier PCI group of the LTE system, and form the PSS sequence of the primary synchronization signal PSS sequence corresponding to the a type of intra-group number Alternative set, a is a positive integer less than or equal to 3;

The second selection module 620 is configured to select b PCI groups from the 168 physical layer cell identification PCI groups in the LTE system, and form the SSS sequence candidate set with the SSS sequences corresponding to the b PCI groups, where b is A positive integer less than or equal to 168, the product of a and b is less than 504;

The sending module 630 is configured to select a PSS sequence from the PSS sequence candidate set and send it to the user equipment, and select an SSS sequence from the SSS sequence candidate set and send it to the user equipment, so that the user equipment can pass the detection of all the SSS sequences. The PSS sequence and the SSS are synchronized.

In some embodiments of the present invention, 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 select c minus 1 as an interval from the Among the 168 PCI groups, b PCI groups are selected, and c is equal to 168/b rounded down; or, the first b PCI groups in the 168 PCI groups are selected.

In some embodiments of the present invention, 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 For the first b PCI packets in the 168 PCI packets, b is equal to the number N of PCIs, and N is a positive integer less than or equal to 168.

In some embodiments of the present invention, the first selection module 610 is specifically configured to select any two of the three types of intra-group numbers in the LTE system; the second selection module 620 is specifically configured to select the The first b PCI groups in the 168 PCI groups, where if the number of PCIs N is an even number, b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2 rounded up, and N is less than or A positive integer equal to 336.

In some embodiments of the present invention, the first selection module 610 is specifically configured to select any two intra-group numbers among the three types of intra-group numbers in the LTE system; the second selection module 620 is specifically configured to select the selected intra-group numbers. The first type of intra-group numbering, the base station equipment selects the secondary synchronization signal SSS sequence corresponding to all 168 PCI groups of the LTE system, and forms a first SSS sequence candidate set corresponding to the first type of intra-group numbering; for the selected The second type of intra-group numbering, the base station equipment selects d secondary synchronization signal SSS sequences corresponding to the PCI groupings from the 168 PCI groups of the LTE system, and forms a second SSS sequence corresponding to the second type of intra-group numbering alternatives 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.

In some embodiments of the present invention, the subcarrier interval between which the PSS sequence and the SSS sequence are mapped to frequency resources is less than 15KHz.

It can be understood that the user equipment in this embodiment of the present invention can be used to execute the LTE synchronization method provided in the second embodiment, or in other words, the functions of each functional module of the user equipment in this embodiment of the present invention can be specifically implemented according to the LTE synchronization method provided in the second embodiment , and the specific implementation process may refer to the relevant descriptions in the foregoing method embodiments, which will not be repeated here.

It can be seen from the above that in the embodiment of the present invention, there are a types of PSS sequences and b types of SSS sequences, and the product of a and b is less than 504, that is, the total number of physical layer cell identifiers PCI in the system is smaller than that of conventional LTE. There are 504 in the system. In this way, when synchronization is performed, the synchronization complexity is reduced, and the time overhead and resource overhead of synchronization can be reduced. In a preferred embodiment, the subcarrier spacing between PSS sequences and SSS sequences mapped to frequency resources needs to be less than 15KHz, which is suitable for a narrowband M2M communication system.

An embodiment of the present invention further provides a wireless communication system, as shown in FIG. 1 , including: the user equipment shown in the third embodiment (the embodiment in FIG. 5 ), and the user equipment shown in the fourth embodiment (the embodiment in FIG. 6 ) base station equipment.

As shown in FIG. 7 , 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 used to store computer execution instructions, the processor 701 is connected to the memory 702 through the bus 703, and when the user equipment is running, the processor 701 executes the memory 702 stored in the memory 702. The computer executes the instructions, so that the user equipment executes the LTE synchronization method shown in Embodiment 1 (ie, the embodiment in FIG. 3 ).

As shown in FIG. 8 , an 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 used to store computer execution instructions, the processor 801 is connected to the memory 802 through the bus 803, and when the controller is running, the processor 801 executes the The computer executes the instructions, so that the base station device executes the LTE synchronization method shown in Embodiment 2 (ie, the embodiment in FIG. 4 ).

An embodiment of the present invention further provides a computer storage medium, including computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes the LTE shown in Embodiment 1 (ie, the embodiment in FIG. 3 ). synchronization method.

An embodiment of the present invention further provides a computer storage medium, including computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes the LTE shown in Embodiment 2 (ie, the embodiment in FIG. 4 ). synchronization method.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It should be noted that, for the sake of simple description, the foregoing method embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because Certain steps may be performed in other orders or simultaneously in accordance with the present invention. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, magnetic disk or optical disk, etc.

The LTE synchronization method and related devices and systems provided by the embodiments of the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The method of the invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this description should not be understood to limit the present invention.

Claims (21)

1. A long-term evolution LTE synchronization method, characterized in that, applied to a machine-device communication M2M system, the method comprising: The user equipment detects the PSS sequence of the primary synchronization signal, performs a cyclic correlation between the PSS sequence and a type of 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; The user equipment detects the SSS sequence of the secondary synchronization signal, cyclically correlates the SSS sequence with the b types of M sequences included in the M sequence set, and obtains the number of the SSS sequence, where b is a positive integer less than or equal to 168, and a and The product of b is less than 504; The detected PSS sequence and the SSS sequence are used for synchronization, 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 subcarrier spacing between the PSS sequence and the SSS sequence mapped to frequency resources is less than 15KHz; The M sequence set includes: SSS sequences corresponding to b PCI packets selected at intervals of c minus 1 from 168 physical layer cell identification PCI packets of the LTE system, where c is equal to 168/b rounded down or, the SSS sequence corresponding to the first b PCI groups selected from the 168 PCI groups in the LTE system. 2. method according to claim 1, is characterized in that: 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: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system. 3. method according to claim 1, is characterized in that: The ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; The M sequence set includes: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system. 4. method according to claim 1, is characterized in that: The ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; The M-sequence set includes: two M-sequence subsets corresponding to the two PSS sequences in the ZC sequence set, wherein one M-sequence subset includes SSS sequences corresponding to all 168 PCI packets of the LTE system, and the other A subset of M sequences includes SSS sequences corresponding to d PCI packets in the LTE system, 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 cyclic correlation between the SSS sequence and the b types of M sequences included in the M sequence set includes: A subset of M sequences corresponding to the detected PSS sequences is determined, and the SSS sequence is cyclically correlated with the M sequences included in the subset of M sequences. 5. A long-term evolution LTE synchronization method, characterized in that, applied to an inter-machine communication M2M system, the method comprising: The base station equipment selects a kind of intra-group number from the three kinds of intra-group numbers of the physical layer cell identification PCI group of the LTE system, and forms a PSS sequence candidate set with the primary synchronization signal PSS sequence corresponding to the a kind of intra-group number, where a is a positive integer less than or equal to 3; The base station equipment selects b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system, and forms the SSS sequence candidate set with the secondary synchronization signal SSS sequences corresponding to the b PCI groups, where b is less than or equal to 168 The positive integer of , the product of a and b is less than 504; The base station equipment selects a PSS sequence from the PSS sequence candidate set and sends it to the user equipment, and selects an SSS sequence from the SSS sequence candidate set and sends it to the user equipment, so that the user equipment can detect the PSS by detecting the PSS sequence. the sequence is synchronized with the SSS; The subcarrier spacing between the PSS sequence and the SSS sequence mapped to frequency resources is less than 15KHz; The base station device selecting b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system includes: selecting b PCI groups from the 168 PCI groups at an interval of c minus 1, where c is equal to 168/b Round down; or, select the first b PCI groups in the 168 PCI groups. 6. The method according to claim 5, wherein: The base station equipment selecting a kind of intra-group number from the three kinds of intra-group numbers of the physical layer cell identification PCI grouping of the LTE system includes: selecting any one of the three kinds of intra-group numbers of the LTE system intra-group number; The base station device selecting b PCI groups from the 168 physical layer cell identification PCI groups in the LTE system includes: selecting the first b PCI groups in the 168 PCI groups, where b is equal to the number of PCIs N, where N is less than or A positive integer equal to 168. 7. The method according to claim 5, wherein: The base station equipment selecting a type of intra-group numbering from the three types of intra-group numbers of the physical layer cell identifier PCI grouping of the LTE system includes: selecting any two types of intra-group numbers in the three types of intra-group numbers of the LTE system; The base station device selecting b PCI groups from the 168 physical layer cell identification PCI groups of the LTE system includes: selecting the first b PCI groups in the 168 PCI groups, wherein, if the number of PCIs N is an even number, then b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2 rounded up, and N is a positive integer less than or equal to 336. 8. The method according to claim 6, wherein: The base station equipment selecting a type of intra-group numbering from the three types of intra-group numbers of the physical layer cell identifier PCI grouping of the LTE system includes: selecting any two types of intra-group numbers in the three types of intra-group numbers of the LTE system; The base station equipment selects b PCI groups from 168 physical layer cell identification PCI groups in the LTE system, and forms the SSS sequence candidate set with the secondary synchronization signal SSS sequences corresponding to the b PCI groups and further includes: For the selected first type of intra-group numbering, the base station equipment selects the secondary synchronization signal SSS sequences corresponding to all 168 PCI groups of the LTE system to form a first SSS sequence candidate set corresponding to the first type of intra-group numbering; For the selected second type of intra-group number, the base station device selects d SSS sequences corresponding to PCI groups from 168 PCI groups in the LTE system to form a second SSS corresponding to the second type of intra-group number 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. 9. A user equipment, characterized in that, applied to a machine-device communication M2M system, the user equipment comprising: The first detection module is used to detect the PSS sequence of the primary synchronization signal, and cyclically correlate the PSS sequence with a ZC sequence included in the ZC sequence set, and obtain the number of the PSS sequence, where a is a positive number less than or equal to 3. integer; The second detection module is used to detect the SSS sequence of the secondary synchronization signal, perform cyclic correlation between the SSS sequence and b types of M sequences included in the M sequence set, and obtain the number of the SSS sequence, where b is a positive number less than or equal to 168 Integer, and the product of a and b is less than 504; a synchronization module, configured to perform synchronization 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 subcarrier spacing between the PSS sequence and the SSS sequence mapped to frequency resources is less than 15KHz; The M sequence set includes: SSS sequences corresponding to b PCI packets selected at intervals of c minus 1 from 168 physical layer cell identification PCI packets of the LTE system, where c is equal to 168/b rounded down or, the SSS sequence corresponding to the first b PCI groups selected from the 168 PCI groups in the LTE system. 10. The user equipment according to claim 9, wherein: 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: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system. 11. The user equipment according to claim 9, wherein: The ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; The M sequence set includes: SSS sequences corresponding to the first b PCI packets in the 168 PCI packets of the LTE system. 12. The user equipment according to claim 9, wherein: The ZC sequence set includes: PSS sequences corresponding to any two of the three intra-group numbers of the LTE system; The M-sequence set includes: two M-sequence subsets corresponding to the two PSS sequences in the ZC sequence set, wherein one M-sequence subset includes SSS sequences corresponding to all 168 PCI packets of the LTE system, and the other A subset of M sequences includes SSS sequences corresponding to d PCI packets in the LTE system, 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 cyclic correlation between the SSS sequence and the b types of M sequences included in the M sequence set includes: A subset of M sequences corresponding to the detected PSS sequences is determined, and the SSS sequence is cyclically correlated with the M sequences included in the subset of M sequences. 13. A base station device, characterized in that, applied to a machine-device communication M2M system, the base station device comprising: The first selection module is used to select a kind of intra-group number from the three kinds of intra-group numbers of the physical layer cell identification PCI grouping of the LTE system, and form the PSS sequence corresponding to the primary synchronization signal PSS sequence of the a kind of intra-group number to prepare a PSS sequence. Selection, a is a positive integer less than or equal to 3; The second selection module is configured to select b PCI groups from the 168 physical layer cell identification PCI groups in the LTE system, and form the SSS sequence candidate set of the secondary synchronization signal SSS sequences corresponding to the b PCI groups, where b is less than or a positive integer equal to 168, the product of a and b is less than 504; A sending module, configured to select a PSS sequence from the alternative set of PSS sequences to send to the user equipment, and select an SSS sequence from the alternative set of SSS sequences to send to the user equipment, so that the user equipment can detect the The PSS sequence is synchronized with the SSS; The subcarrier spacing between the PSS sequence and the SSS sequence mapped to frequency resources is less than 15KHz; The second selection module is specifically configured to select b PCI groups from the 168 PCI groups at an interval of c minus 1, where c is equal to 168/b rounded down; or, select the 168 PCI groups The first b PCI packets in . 14. The base station device according to claim 13, wherein: The first selection module is specifically used to select any one of the three intra-group numbers of the LTE system; The second selection module is specifically configured to select the first b PCI groups in the 168 PCI groups, where b is equal to the number N of PCIs, and N is a positive integer less than or equal to 168. 15. The base station device according to claim 13, wherein: The first selection module is specifically used to select any two intra-group numbers in the three types of intra-group numbers of the LTE system; The second selection module is specifically configured to select the first b PCI groups in the 168 PCI groups, wherein if the number of PCIs N is an even number, b is equal to N/2; if the number of PCIs N is an odd number, b is equal to N/2 rounded up, where N is a positive integer less than or equal to 336. 16. The base station device according to claim 13, wherein: The first selection module is specifically used to select any two intra-group numbers in the three types of intra-group numbers of the LTE system; The second selection module is specifically configured to select the SSS sequence of the secondary synchronization signal corresponding to all 168 PCI groups of the LTE system for the selected first intra-group number, and form a sequence corresponding to the first intra-group number. The numbered first SSS sequence candidate set; for the selected second type of intra-group numbering, the base station equipment selects d secondary synchronization signal SSS sequences corresponding to PCI groups from 168 PCI groups in the LTE system, forming a sequence corresponding to The second candidate set of the second SSS sequence numbered in the second group, 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. 17. A machine-device communication M2M system, comprising: The user equipment according to any one of claims 9 to 12, and the base station equipment according to any one of claims 13 to 16. 18. A user equipment, characterized in that, when applied to a machine-device communication M2M system, the user equipment includes a processor, a memory, a bus, and a communication interface; the memory is used to store computer execution instructions, and the processor and the The memory is connected through the bus, and when the user equipment is running, the processor executes the computer-executed instructions stored in the memory, so that the user equipment executes any one of claims 1-4. LTE synchronization method. 19. A base station device, characterized in that it is applied to a machine-device communication M2M system, the base station device comprising a processor, a memory, a bus, and a communication interface; The memory is used to store computer-executed instructions, the processor is connected to the memory through the bus, and when the user equipment is running, the processor executes the computer-executed instructions stored in the memory, so that the The user equipment performs the LTE synchronization method according to any one of claims 5-8. 20. A computer storage medium, comprising computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes the LTE synchronization method according to any one of claims 1-4. 21. A computer storage medium, comprising computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes the LTE synchronization method according to any one of claims 5-8.