CN105409301B

CN105409301B - LTE synchronous method and relevant device and system

Info

Publication number: CN105409301B
Application number: CN201480029102.4A
Authority: CN
Inventors: 龚政委; 丁仁天
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-07-04
Filing date: 2014-07-04
Publication date: 2019-07-19
Anticipated expiration: 2034-07-04
Also published as: CN105409301A; WO2016000258A1

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 synchronous method and relevant device and system

Technical field

The present invention relates to fields of communication technology, and in particular to a kind of LTE synchronous method and relevant device and system.

Background technique

In recent years, the fast development of wireless network pushed M2M (machine to machine communication, Inter-machine communication) communication rapid expansion, M2M business has also been extended to vehicle remote communication, consumer electronics, fleet management, intelligence The fields such as energy metering.Currently, various low-power consumption, low cost, extensively cover and dispose flexible M2M communication system be research heat Point.The evolution technology of various communication standards also becomes the first choice of M2M system naturally.Consider the characteristics such as system call flexibility ratio, Evolution based on LTE (Long term evolution, long term evolution) is hot spot candidate technologies.

Existing UE (User Equipment, user equipment) will be linked into LTE cell, and it is small must to first pass through synchronizing channel progress Area searching, in physical layer, cell searching includes a series of synchronous phases, to obtain time synchronization and Frequency Synchronization.Wherein, synchronous Stage needs to carry out a large amount of blind searches, so synchronous time overhead and resource overhead is huge.And in narrowband M2M communication etc. Resource-constrained scene, for example, in low cost UE chip communication, it is especially desirable to which the time overhead and resource of optimized synchronization channel are opened Pin.

Summary of the invention

The embodiment of the present invention provides a kind of LTE synchronous method and relevant device and system, to reduce the synchronization complexity of UE, Reduce synchronous time overhead and resource overhead.

First aspect present invention provides a kind of LTE synchronous method, comprising:

User equipment detects primary synchronization signal PSS sequence, by a kind ZC included by the PSS sequence and ZC arrangement set Sequence does circulation correlation, obtains the number of the PSS sequence, and a is the positive integer less than or equal to 3；User equipment detection is auxiliary same Signal SSS sequence is walked, it is related that the SSS sequence and b kind M sequence included by M sequence set are done circulation, obtains the SSS The number of sequence, b is the positive integer less than or equal to 168, and the product of a and b is less than 504；Utilize the PSS sequence detected Column and the SSS sequence synchronize, wherein determine physics according to the number of the number of the PSS sequence and the SSS sequence Layer cell identifiers PCI.

With reference to first aspect, in the first possible implementation, the M sequence set includes: from LTE system 1, which is subtracted, with c in 168 physical-layer cell identifier PCI groupings is grouped corresponding SSS sequence, c etc. for the b PCI that interval is selected It is rounded downwards in 168/b；Alternatively, the preceding b PCI selected from 168 PCI of LTE system grouping is grouped corresponding SSS sequence Column.

With reference to first aspect, in the second possible implementation, the ZC arrangement set includes: the three of LTE system The corresponding PSS sequence of the interior number of any one group in kind group in number；The M sequence set includes: 168 of LTE system Preceding b PCI in PCI grouping is grouped corresponding SSS sequence.

With reference to first aspect, in the third possible implementation, the ZC arrangement set includes: the three of LTE system Corresponding PSS sequence is numbered in any two kinds of groups in kind group in number；The M sequence set includes: 168 of LTE system Preceding b PCI in PCI grouping is grouped corresponding SSS sequence.

With reference to first aspect, in the fourth possible implementation, the ZC arrangement set includes: the three of LTE system Corresponding PSS sequence is numbered in any two kinds of groups in kind group in number；The M sequence set include: correspond respectively to it is described Two M sequence subclass of 2 kinds of PSS sequences in ZC arrangement set, one of M sequence subclass include the complete of LTE system 168, portion PCI is grouped corresponding SSS sequence, another M sequence subclass includes that the d PCI grouping in LTE system is corresponding SSS sequence, d=N-168, N are PCI number, and N is the positive integer greater than 168 but less than or equal to 336；It is described by the SSS B kind M sequence included by sequence and M sequence set does circulation and related comprises determining that M sequence corresponding with the PSS sequence detected It is related to M sequence included by the M sequence subclass to be done circulation by column subclass for the SSS sequence.

With reference to first aspect or first aspect the first any one of to the 4th kind of possible implementation, the 5th In the possible implementation of kind, the subcarrier spacing that the PSS sequence and the SSS sequence are mapped to frequency resource is less than 15KHz。

Second aspect of the present invention provides a kind of LTE synchronous method, comprising:

Base station equipment selects to compile in a kind group from numbering in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped Number, corresponding primary synchronization signal PSS sequence composition PSS sequence alternative collection will be numbered in a kind group, a is less than or equal to 3 Positive integer；Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping, by institute It states b PCI and is grouped corresponding secondary synchronization signal SSS sequence composition SSS sequence alternative collection, b is just whole less than or equal to 168 The product of number, a and b are less than 504；The base station equipment selects a PSS sequence to be sent to use from the PSS sequence alternative collection Family equipment, and, select a SSS sequence to be sent to user equipment from the SSS sequence alternative collection, so that the user sets It is standby to be synchronized by detecting the PSS sequence and the SSS.

In conjunction with second aspect, in the first possible implementation, the physical layer of the base station equipment from LTE system is small Number includes: to compile in all three group for select LTE system in selection a kind group in number in three kinds of groups of area's mark PCI grouping Number；Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping includes: with c Subtracting 1, b PCI grouping of selection, c are equal to 168/b and are rounded downwards from 168 PCI grouping for interval；Alternatively, selection institute State the preceding b PCI grouping in 168 PCI groupings.

In conjunction with second aspect, in the second possible implementation, the physical layer of the base station equipment from LTE system is small Selecting number in a kind group in three kinds of groups of area's mark PCI grouping in number includes: in numbering in three kinds of groups for select LTE system Any one group in number；The base station equipment is selection b from 168 physical-layer cell identifier PCI of LTE system grouping PCI grouping includes: the preceding b PCI grouping in selection 168 PCI grouping, and b is equal to PCI several N, N for less than or equal to 168 positive integer.

In conjunction with second aspect, in the third possible implementation, the physical layer of the base station equipment from LTE system is small Selecting number in a kind group in three kinds of groups of area's mark PCI grouping in number includes: in numbering in three kinds of groups for select LTE system Any two kinds of groups in number；The base station equipment is selection b from 168 physical-layer cell identifier PCI of LTE system grouping PCI grouping includes: the preceding b PCI grouping in selection 168 PCI grouping, wherein if PCI several N are even number, b etc. In N/2；If PCI several N are odd number, b rounds up equal to N/2, and N is the positive integer less than or equal to 336.

In conjunction with second aspect, in the fourth possible implementation, the physical layer of the base station equipment from LTE system is small Selecting number in a kind group in three kinds of groups of area's mark PCI grouping in number includes: in numbering in three kinds of groups for select LTE system Any two kinds of groups in number；The base station equipment is selection b from 168 physical-layer cell identifier PCI of LTE system grouping PCI grouping, it includes: for selected that the b PCI, which is grouped corresponding secondary synchronization signal SSS sequence composition SSS sequence alternative collection, All 168 PCI of number in the first group selected, the base station equipment selection LTE system are grouped corresponding secondary synchronization signal SSS sequence, composition correspond to the first SSS sequence alternative collection numbered in the first group；For being compiled in selected second group Number, base station equipment d PCI of selection from 168 PCI of LTE system grouping is grouped corresponding secondary synchronization signal SSS sequence Column, composition correspond to second group in number the 2nd SSS sequence alternative collection, d=N-168, N be PCI number, and N for greater than 168 but be less than or equal to 336 positive integer.

In conjunction with any one of the first of second aspect or second aspect to the 4th kind of possible implementation, the 5th In the possible implementation of kind, the subcarrier spacing that the PSS sequence and the SSS sequence are mapped to frequency resource is less than 15KHz。

Third aspect present invention provides a kind of user equipment, comprising:

First detection module is wrapped the PSS sequence with ZC arrangement set for detecting primary synchronization signal PSS sequence The a kind ZC sequence included does circulation correlation, obtains the number of the PSS sequence, and a is the positive integer less than or equal to 3；Second detection Module recycles the SSS sequence and b kind M sequence included by M sequence set for detecting secondary synchronization signal SSS sequence Correlation obtains the number of the SSS sequence, and b is the positive integer less than or equal to 168, and the product of a and b is less than 504；It is synchronous Module, for being synchronized using the PSS sequence and the SSS sequence that detect, wherein according to the PSS sequence The number of number and the SSS sequence determines physical-layer cell identifier PCI.

In conjunction with the third aspect, in the first possible implementation, the M sequence set includes: from LTE system 1, which is subtracted, with c in 168 physical-layer cell identifier PCI groupings is grouped corresponding SSS sequence, c etc. for the b PCI that interval is selected It is rounded downwards in 168/b；Alternatively, the preceding b PCI selected from 168 PCI of LTE system grouping is grouped corresponding SSS sequence Column.

In conjunction with the third aspect, in the second possible implementation, the ZC arrangement set includes: the three of LTE system The corresponding PSS sequence of the interior number of any one group in kind group in number；The M sequence set includes: 168 of LTE system Preceding b PCI in PCI grouping is grouped corresponding SSS sequence.

In conjunction with the third aspect, in the third possible implementation, the ZC arrangement set includes: the three of LTE system Corresponding PSS sequence is numbered in any two kinds of groups in kind group in number；The M sequence set includes: 168 of LTE system Preceding b PCI in PCI grouping is grouped corresponding SSS sequence.

In conjunction with the third aspect, in the fourth possible implementation, the ZC arrangement set includes: the three of LTE system Corresponding PSS sequence is numbered in any two kinds of groups in kind group in number；The M sequence set include: correspond respectively to it is described Two M sequence subclass of 2 kinds of PSS sequences in ZC arrangement set, one of M sequence subclass include the complete of LTE system 168, portion PCI is grouped corresponding SSS sequence, another M sequence subclass includes that the d PCI grouping in LTE system is corresponding SSS sequence, d=N-168, N are PCI number, and N is the positive integer greater than 168 but less than or equal to 336；It is described by the SSS B kind M sequence included by sequence and M sequence set does circulation and related comprises determining that M sequence corresponding with the PSS sequence detected It is related to M sequence included by the M sequence subclass to be done circulation by column subclass for the SSS sequence.

In conjunction with any one of the first of the third aspect or the third aspect to the 4th kind of possible implementation, the 5th In the possible implementation of kind, the subcarrier spacing that the PSS sequence and the SSS sequence are mapped to frequency resource is less than 15KHz。

Fourth aspect present invention provides a kind of base station equipment, comprising:

First choice module, for being selected from being numbered in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped Number in a kind group, will number corresponding primary synchronization signal PSS sequence composition PSS sequence alternative collection in a kind group, a be less than Or the positive integer equal to 3；Second selecting module, for selecting b from 168 physical-layer cell identifier PCI of LTE system grouping The b PCI is grouped corresponding secondary synchronization signal SSS sequence and forms SSS sequence alternative collection by a PCI grouping, b to be less than or The product of positive integer equal to 168, a and b are less than 504；Sending module, for selecting one from the PSS sequence alternative collection PSS sequence is sent to user equipment, and, it selects a SSS sequence to be sent to user from the SSS sequence alternative collection and sets It is standby, so that the user equipment is synchronized by detecting the PSS sequence and the SSS.

In conjunction with fourth aspect, in the first possible implementation, the first choice module is specifically used for selection Number in all three group of LTE system；Second selecting module is interval from described 168 specifically for subtracting 1 with c B PCI grouping of selection, c are equal to 168/b and are rounded downwards in PCI grouping；Alternatively, preceding b in selection 168 PCI grouping PCI grouping.

In conjunction with fourth aspect, in the second possible implementation, the first choice module is specifically used for selection Number in any one group in three kinds of groups of LTE system in number；Second selecting module is specifically used for described in selection Preceding b PCI grouping in 168 PCI groupings, b are equal to PCI several N, and N is the positive integer less than or equal to 168.

In conjunction with fourth aspect, in the third possible implementation, the first choice module is specifically used for selection Number in any two kinds of groups in three kinds of groups of LTE system in number；Second selecting module is specifically used for described in selection Preceding b PCI grouping in 168 PCI groupings, wherein if PCI several N are even number, b is equal to N/2；If PCI several N are surprise Number, b round up equal to N/2, and N is the positive integer less than or equal to 336.

In conjunction with fourth aspect, in the fourth possible implementation, the first choice module is specifically used for selection Number in any two kinds of groups in three kinds of groups of LTE system in number；Second selecting module is specifically used for for selected The first group in number, all 168 PCI of base station equipment selection LTE system are grouped corresponding secondary synchronization signal SSS Sequence, composition correspond to the first SSS sequence alternative collection numbered in the first group；For being numbered in selected second group, Base station equipment d PCI of selection from 168 PCI of LTE system grouping is grouped corresponding secondary synchronization signal SSS sequence, group At corresponding to the 2nd SSS sequence alternative collection numbered in second group, d=N-168, N are PCI number, and N for greater than 168 but Positive integer less than or equal to 336.

In conjunction with any one of the first of fourth aspect or fourth aspect to the 4th kind of possible implementation, the 5th In the possible implementation of kind, the subcarrier spacing that the PSS sequence and the SSS sequence are mapped to frequency resource is less than 15KHz。

Fifth aspect present invention provides a kind of wireless communication system, comprising: the user as third aspect present invention provides sets It is standby, and, the base station equipment provided such as fourth aspect present invention.

Sixth aspect present invention provides a kind of user equipment, and the user equipment includes processor, memory, bus and leads to Believe interface；For storing computer executed instructions, the processor is connected with the memory by the bus memory It connects, when user equipment operation, the processor executes the computer executed instructions of the memory storage, so that The user equipment executes LTE synchronous method as described in the first aspect of the invention.

Seventh aspect present invention provides a kind of base station equipment, and the base station equipment includes processor, memory, bus and leads to Believe interface；For storing computer executed instructions, the processor is connected with the memory by the bus memory It connects, when user equipment operation, the processor executes the computer executed instructions of the memory storage, so that The user equipment executes LTE synchronous method as described in respect of the second aspect of the invention.

Eighth aspect present invention provides a kind of computer storage medium, including computer executed instructions, for computer When processor executes the computer executed instructions, the LTE that the computer is executed as described in the first aspect of the invention is synchronous Method.

Ninth aspect present invention provides a kind of computer storage medium, including computer executed instructions, for computer When processor executes the computer executed instructions, the computer executes the side of synchronization LTE as described in respect of the second aspect of the invention Method.

Therefore in technical solution of the embodiment of the present invention, the PSS sequence of use has an a kind, and SSS sequence has a b kind, and a and The product of b is less than 504, that is, total PCI number of physical-layer cell identifier in system, less than 504 in conventional LTE system, this Sample just reduces synchronization complexity when synchronizing, it is possible to reduce synchronous time overhead and resource overhead.

Detailed description of the invention

Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to institute in embodiment and description of the prior art Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.

Fig. 1 is the configuration diagram of wireless communication system of the embodiment of the present invention；

Fig. 2 is the flow diagram of LTE synchronization and cell searching；

Fig. 3 is a kind of flow diagram of LTE synchronous method provided in an embodiment of the present invention；

Fig. 4 is the flow diagram of another kind LTE synchronous method provided in an embodiment of the present invention；

Fig. 5 is a kind of structural schematic diagram of user equipment provided in an embodiment of the present invention；

Fig. 6 is a kind of structural schematic diagram of base station equipment provided in an embodiment of the present invention；

Fig. 7 is the structural schematic diagram of another user equipment provided in an embodiment of the present invention；

Fig. 8 is the structural schematic diagram of another base station equipment provided in an embodiment of the present invention.

Specific embodiment

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work It encloses.

In the following, doing a simple introduction to the simultaneous techniques of LTE system first.

LTE, which has altogether, defines 504 different physical-layer cell identifiers (Physical Cell ID, PCI), and this 504 PCI is corresponded in LTE physical layer protocol 36.211Value range 0~503, each PCI corresponding one specific downlink ginseng Examine signal sequence.The set of all PCI is divided into 168 groups (in corresponding agreement 36.211Value range 0~167), Every group comprising 3 cell ID (in corresponding agreement 36.211Value range 0~2).PCI is by packet numberingIn group NumberIt codetermines, PCI number

The synchronization of LTE includes main synchronization and auxiliary synchronous two processes, defines 2 downlink synchronous signals:

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

In the frame format of LTE FDD (Frequency Division Duplex, frequency division duplex), PSS is mapped in subframe The last one OFDM (Orthogonal Frequency Division of 0 and 5 first time slot (slot) 7th OFDM symbol of Multiplexing) symbol, i.e. the 1st time slot and the 11st time slot；SSS and PSS are mapped in same son The same time slot of frame is sent, but SSS ratio PSS proposes previous OFDM symbol, that is, SSS is mapped in the 1st time slot and the 11st time slot 6th symbol.

In the frame format of LTE TDD (Time Division Duplex, time division duplex), PSS is mapped in 1 He of subframe The third OFDM symbol of 6 (i.e. DwPTS)；And SSS shifts to an earlier date 3 OFDM than PSS in the last one OFDM symbol of subframe 0 and 5 Symbol.

On frequency domain, 72 subcarriers of PSS and all busy channel centers SSS, wherein used 62 of bandwidth center Subcarrier, both sides have respectively stayed 5 subcarriers to be used as protection wave band.UE can be gone near the center frequency point of its LTE bandwidth supported It attempts to receive PSS and SSS.

PSS uses ZC (Zadoff-Chu) sequence that length is 63, and (there is DC subcarrier in centre, so the length actually transmitted Degree is 62), in addition 5 subcarriers for being used as protection frequency range that boundary is additionally reserved, form and occupy 72 son loads of bandwidth center The PSS of wave.PSS has 3 values, corresponding three kinds of different Zadoff-Chu sequences, the interior number of the corresponding PCI group of every kind of sequenceThe corresponding sequence of the PSS of some cell is determined by the PCI of the cell.

As shown in table 1, differentCorresponding different root sequence index value (Root index u), and then determine not With ZC sequence.

Table 1

UE receives PSS, will use Root index u to attempt decoding PSS, until wherein some Root index u Until successfully solving PSS.In this way, UE has been known that the cellAgain due to the position of PSS in the time domain be it is fixed, because This UE and the 5ms timing of the available cell.Due in a 10ms system-frame there are two PSS, and the two PSS sequences Column are identical, therefore UE does not know that the PSS solved is the PSS sequence of preceding 5ms or the PSS sequence of rear 5ms, so can only obtain To 5ms timing (timing).

SSS is the sequence that the M sequence for being 31 by two length intersects that the length that cascade obtains is 62, similar with PSS, in addition 5 subcarriers for being used as protection frequency range that boundary is additionally reserved, form the SSS for occupying 72 subcarriers of bandwidth center.One In system-frame, the SSS of preceding field intersect cascade system and rear field to intersect cascade system opposite.Wherein, each M sequence can To take 31 different values, 31 kinds of different offsets of actually same M sequence.

As shown in table 2,168 SSS sequences pass through offset sequence (m0, m1) and PCI packet numbering respectivelyIt is corresponding.

Table 2

In LTE system, after UE detects PSS, it has been known that position that SSS is likely to occur (if UE while supporting FDD And TDD, then at most have 4 positions).UE detects and is successfully decoded out SSS, has determined that one of 168 kinds of values in table 2, also PCI packet numbering has been determinedIn turn, PCI number has also been determined that,

Also, according to the intersection cascade system of SSS, it may be determined that the SSS is just true positioned at subframe 0 or subframe 5, and then also The position in the system-frame where subframe 0, i.e. 10ms timing (timing), to realize frame synchronization are determined.In addition, by should The position that SSS occurs, it may be determined that any working method of the work in FDD and TDD.

Therefore in LTE synchronizing process, main synchronizing process is first carried out, in main synchronizing process, three groups of different sheets of UE It is related that ground ZC sequence and received PSS sequence do circulation, and the number of PSS sequence is determined by correlation peakIt is same to complete time domain Step.Then carry out auxiliary synchronization, in auxiliary synchronizing process, UE is recycled with 168 groups of different local M sequences and received SSS sequence Correlation is determined the number of SSS sequence selected by transmitting terminal base station equipment as correlation peakThen, UE utilization detects The PSS sequence and the SSS sequence synchronize, wherein can be according to the number and the SSS sequence of the PSS sequence It numbers and determines physical-layer cell identifier (PCI), PCI number

In conclusion the LTE cell number of existing identical networking is more, reach 504, auxiliary synchronizing process needs to do 168 It is secondary it is related relatively so that terminal complexity is very high, time overhead and resource overhead are larger, this is to reducing power consumption and cost not Benefit.In addition, subcarrier spacing 15KHz, system bandwidth is at least 1.4MHz in existing LTE system, that is, the synchronizing channel of LTE Design may be only available for system bandwidth in the system of 1.4MHz or more.And current narrowband M2M communication system, subcarrier spacing are small In 15KHz, system bandwidth is less than 1.4MHz, if initial frequency deviation is bigger, it is also necessary to carry out the rasterizing search of frequency, this is just UE receiving algorithm complexity is substantially increased, thus, it would be desirable to simplify existing synchronizing channel, meets narrowband M2M system.

To solve the above-mentioned problems, the embodiment of the present invention provides a kind of LTE synchronous method and relevant device and system, below It is described in detail in conjunction with attached drawing.

Technical solution of the embodiment of the present invention is applied to a kind of wireless communication system.As shown in Figure 1, the wireless communication system packet It includes: user equipment 100 and base station equipment 200.The wireless communication system is a kind of LTE system, specifically be can be a kind of based on LTE M2M communication system, be also possible to other types of communication systems based on LTE, herein with no restriction to this.

Base station equipment can send primary synchronization signal PSS by primary synchronization channel (P-SCH), pass through for providing LTE cell Auxiliary synchronization channel (S-SCH) sends secondary synchronization signal SSS.User equipment (UE) can be same by detection PSS and SSS and LTE cell Step, and then access LTE cell.

As shown in Fig. 2, being LTE synchronization and cell searching schematic diagram.

Firstly, UE detects P-SCH in several center frequency points there may be LTE cell, PSS sequence is received；Detect PSS After sequence success, then in possible position, S-SCH is detected, receives SSS sequence；It then, can be according to the number and SSS sequence of PSS sequence The number of column determines the PCI of physical-layer cell, and completes 5ms timing and 10ms timing, reaches frame synchronization.

Then, UE can further receive the downlink reference signal (DL_RS) of base station sending, realize the more smart of time slot and frequency It is really synchronous.

Subsequently, UE can carry out cell searching, PBCH (the Physical Broadcast issued by receiving base station Channel, Physical Broadcast Channel) signal, extracts MIB (Master Information Block, the main information wherein carried Block), some system informations are obtained, such as downlink system bandwidth, PHICH configuration, antenna number, System Frame Number (System Frame Number, SFN) etc.；

Finally, receiving the PDSCH that base station issues, (Physical Downlink Shared Channel, physical down are total Enjoy channel) signal, enough SIB (System Information Type, system information type) message is obtained, cell is completed Search, thus the LTE cell that access searches.

Embodiment one

Referring to FIG. 3, the embodiment of the present invention provides a kind of long term evolution LTE synchronous method, it may include:

110, user equipment detects primary synchronization signal PSS sequence, by a included by the PSS sequence and ZC arrangement set Kind ZC sequence does circulation correlation, obtains the number of the PSS sequence, and a is the positive integer less than or equal to 3.

In the embodiment of the present invention, the number of the physical-layer cell by reducing synchronizing sequence multiplexing, to reduce M2M system Terminal synchronization complexity.That is, by the way that 3 kinds of PSS sequences in existing LTE system are reduced to 2 kinds or a kind, alternatively, pass through by 168 kinds of SSS sequences are reduced, to reduce the number of total PCI.For example, can not reduce PSS sequence in some embodiments, only subtract Few SSS sequence；In other embodiments, PSS sequence and SSS sequence can also be reduced simultaneously.

In the embodiment of the present invention, it can be numbered out of LTE system 3 kinds of groups in corresponding 3 kinds of PSS sequences and arbitrarily select a Kind, a is 1 or 2 or 3, and a kind PSS sequence of selection is formed a set.The PSS sequence used in LTE system is specifically ZC sequence Column, in user equipment side, the set of this kind PSS sequence composition can be described as ZC arrangement set.When user equipment detects PSS After sequence, it is related that the PSS sequence received and a kind ZC sequence included by local ZC arrangement set can do to circulation, obtains Take the number of the PSS sequence detected.In the present embodiment, in main synchronizing process, it is only necessary to carry out a circulation correlation i.e. Can, when a is less than 3, the complexity of main synchronization can be reduced, reduces time and resource overhead.

120, user equipment detects secondary synchronization signal SSS sequence, by b kind included by the SSS sequence and M sequence set M sequence does circulation correlation, 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 small In 504.

In the embodiment of the present invention, it can be grouped in corresponding 168 kinds of SSS sequences from 168 PCI of LTE system and arbitrarily select B kind is selected, b is the positive integer less than or equal to 168, and the b kind SSS sequence of selection is formed a set.It is used in LTE system SSS sequence is specifically M sequence, and in user equipment side, the set of this b kind SSS sequence composition can be described as M sequence set.When with It, can be by b kind M sequence included by the SSS sequence received and local M sequence set after family equipment detects SSS sequence It is related to do circulation, obtains the number of the SSS sequence detected.In the present embodiment, in auxiliary synchronizing process, it is only necessary to carry out b Secondary circulation is related, when b is less than 168, can reduce the complexity of auxiliary synchronization, reduce time and resource overhead.

In the present embodiment, since the product of a and b is less than 504, necessarily there is a less than 3 or b is less than 168, therefore, Total energy reduces synchronous complexity, reduces time and resource overhead.

130, it is synchronized using the PSS sequence and the SSS sequence that detect, wherein according to the PSS sequence Number and the number of the SSS sequence determine physical-layer cell identifier PCI.

In LTE system, UE can complete 5ms timing according to the PSS sequence detected, then, according to the SSS sequence detected 10ms timing is completed, frame synchronization is reached.Also, physical-layer cell can be determined according to the number of PSS sequence and the number of SSS sequence PCI.PCI numberIt is the number of the SSS sequence detected,It is the PSS sequence detected The number of column.

In some embodiments of the invention, 3 groups of ZC sequences of main synchronization can be kept constant, reduce the M sequence of auxiliary synchronization Number redesigns the mapping relations between auxiliary synchronization channel offset sequence and PCI packet numbering.

A kind of embodiment, the M sequence set can include: from 168 physical-layer cell identifier PCI of LTE system points 1 is subtracted with c in group and is grouped corresponding SSS sequence for the b PCI that interval is selected, and c is equal to 168/b and is rounded downwards.

Assuming that ID number of the cell of M2M system is N_ID, organizing interior number number isThen being grouped number isSymbolExpression rounds up.In the present embodiment, it can calculateWith N_GAPBetween -1 is Every uniformly in mistake！Reference source is not found.In, select corresponding PCI packet offsets sequence, wherein symbolIndicate to Lower rounding.Corresponding SSS sequence, which is grouped, with the PCI of selection forms M sequence set.This means that the system cell M2M packet numberingCorresponding offset sequence offset sequence corresponding with the cell packet numbering of existing LTE system is consistent.

WithFor, i.e., it is 14 that we, which need the PCI of auxiliary synchronization to be grouped number, I.e. we choose from original table 2 every 11Successively chooseCan be 0,12,24,36,48,60,72, 84,96,108,120,132,144,156,14 in total, as shown in 3 bend fill part of table.IfThen chosen every 10Successively chooseCan be 0,11,22,33, 44,55,66,77,88,99,110,121,132,143,154,165,16 in total.

Table 3

Another embodiment, the M sequence set can include: the preceding b selected from 168 PCI of LTE system grouping A PCI is grouped corresponding SSS sequence.Preceding b in 168 PCI packet sequences shown in table 2 are selected, then can be supported in total 3b PCI.

If ID number of the cell of M2M system is N_ID, organizing interior number number isThen small packet numbering number isIt can sequentially be chosen in table 2A offset sequence is for mapping packet numbering, that is, preceding b of selection PCI is grouped corresponding SSS sequence and forms M sequence set, here,This means that the system cell M2M packet numbering Corresponding offset sequence offset sequence corresponding with the cell packet numbering of existing LTE system is consistent.WithFor, then Corresponding SSS sequence can be grouped by preceding 14 PCI from original table 2, as shown in 4 bend fill part of table.

Table 4

In some embodiments of the invention, it is possible to reduce 3 groups of ZC sequence numbers of main synchronization, while also reducing the M of auxiliary synchronization Sequence number redesigns the mapping relations between auxiliary synchronization channel offset sequence and PCI packet numbering.

In a kind of embodiment, the ZC arrangement set can include: any one in three kinds of groups of LTE system in number The corresponding PSS sequence of number in group；The M sequence set includes: the preceding b PCI grouping in 168 PCI grouping of LTE system Corresponding SSS sequence.The ZC sequence number of original main synchronization is 3, true by three root sequence index values { 25,29,34 } of ZC sequence It is fixed, can be reduced according to community user number to 1 or 2, and the number of cells supported according to specific needs determine every group it is auxiliary Synchronized cells number.For example, it may be determined that PSS number is 1, the ZC sequence that root sequence index value is { 29 }, SSS can be preferentially chosen Sequence number is b, at this point,168 can be chosen shown in table 2In the local M sequence of preceding b composition Set, when b is equal to 14, selection result is as shown in table 4.The embodiment is suitable for N_IDThe case where less than or equal to 168, especially Suitable for N_IDThe case where less than 31, work as N_IDWhen less than 31, the preceding N of selection_IDIt is aOffset sequence (m₀, m₁) weight is not had It is multiple, it is easier to detection identification.

In a kind of embodiment, the ZC arrangement set can include: any two kinds in three kinds of groups of LTE system in number The corresponding PSS sequence of number in group；The M sequence set can include: preceding b PCI points in 168 PCI grouping of LTE system The corresponding SSS sequence of group.This kind of embodiment is particularly suitable for N_IDThe case where more than or equal to 31 but being less than or equal to 336.Under Face is described in detail:

For PSS sequence, determines that PSS sequence number is 2, the ZC sequence that root sequence index value is { 25,29 } can be chosen As main synchronized cells ID, can also choose root sequence is the ZC sequence of { 29,34 } as main synchronized cells ID, can also choose root Sequence is the ZC sequence of { 25,29 } as main synchronized cells ID.

For SSS sequence, the preceding b PCI that can be chosen in table 2 is grouped corresponding SSS sequence.Further, if N_IDFor idol Number, then the N/2 cell as SSS before two groups of SSS sequences can be distributed respectivelyIf N_IDFor odd number, then first PSS sequence is directed to Column can distributeA SSS cellIt can be distributed for second PSS sequenceA SSS cell

In a kind of embodiment, the ZC arrangement set can include: any two kinds in three kinds of groups of LTE system in number The corresponding PSS sequence of number in group；The M sequence set can include: correspond respectively to 2 kinds of PSS in the ZC arrangement set Two M sequence subclass of sequence, one of M sequence subclass include that all 168 PCI groupings of LTE system are corresponding SSS sequence；Another M sequence subclass includes that d PCI in LTE system is grouped corresponding SSS sequence, and d=N-168, N are PCI number, and N is the positive integer greater than 168 but less than or equal to 336, for example, when d is equal to 14, selection result such as table Shown in 4.Correspondingly, described, that the SSS sequence done circulation to b kind M sequence included by M sequence set is related can include: really Fixed M sequence subclass corresponding with the PSS sequence detected, by M included by the SSS sequence and the M sequence subclass It is related that sequence does circulation.

This kind of embodiment is particularly suitable for N_IDThe case where greater than 168 but being less than or equal to 336.It specifically may include following several Kind selection (Option):

Option1: then determine that PSS sequence number is 2.Choosing root sequence is the ZC sequence of { 25,29 } as main synchronization CellIn the main synchronized cells that root sequence is { 29 }, 168 groups of cells are selectedIn the main synchronization that root sequence is { 25 } In cell, N is selected_ID- 168 group cells

Option2: then determine that PSS sequence number is 2.Choosing root sequence is the ZC sequence of { 25,29 } as main synchronization CellIn the main synchronized cells that root sequence is { 25 }, 168 groups of cells are selectedIn the main synchronization that root sequence is { 29 } In cell, N is selected_ID- 168 group cells

Option3: then determine that PSS sequence number is 2.Choosing root sequence is the ZC sequence of { 34,29 } as main synchronization CellIn the main synchronized cells that root sequence is { 29 }, 168 groups of cells are selectedIn the main synchronization that root sequence is { 34 } In cell, N is selected_ID- 168 group cells

Option4: then determine that PSS sequence number is 2.Choosing root sequence is the ZC sequence of { 34,29 } as main synchronization CellIn the main synchronized cells that root sequence is { 34 }, 168 groups of cells are selectedIn the main synchronization that root sequence is { 29 } In cell, N is selected_ID- 168 group cells

Option5: then determine that PSS sequence number is 2.Choosing root sequence is the ZC sequence of { 25,34 } as main synchronization CellIn the main synchronized cells that root sequence is { 25 }, 168 groups of cells are selectedIn the main synchronization that root sequence is { 34 } In cell, N is selected_ID- 168 group cells

Option6: then determine that PSS sequence number is 2.Choosing root sequence is the ZC sequence of { 25,34 } as main synchronization CellIn the main synchronized cells that root sequence is { 34 }, 168 groups of cells are selectedIn the main synchronization that root sequence is { 25 } In cell, N is selected_ID- 168 group cells

In some embodiments of the invention, the method is applied to M2M system.The synchronizing channel of M2M system is full due to needing The wide covering of foot, the demand of large capacity need to work under narrowband systems (such as system bandwidth is less than 1.4MNHz).So synchronous Sequence need to map in narrower system bandwidth, and the PSS sequence and SSS sequence that length is 62 are mapped to bandwidth center, sub- load Wave spacing needs to be less than 15KHz, such as subcarrier spacing can be in 10KHz or 5KHz or less.In a kind of embodiment, the PSS The subcarrier spacing that sequence and the SSS sequence are mapped to frequency resource is 2.5KHz.

It is appreciated that above scheme of the embodiment of the present invention for example can be specific real on user equipment, such as mobile phone equipment It applies.

More than, from user equipment side, LTE synchronous method provided in an embodiment of the present invention is illustrated.The present invention Embodiment method, the PSS sequence of use have a kind, and SSS sequence has b kind, and the product of a and b is less than 504, that is, in system always PCI number of physical-layer cell identifier, less than 504 in conventional LTE system, in this way, just reducing synchronization when synchronizing Complexity, it is possible to reduce synchronous time overhead and resource overhead.In preferred embodiment, PSS sequence and SSS sequence are mapped to frequency The subcarrier spacing of rate resource needs to be less than 15KHz, is suitable for narrowband M2M communication system.

To sum up, in the embodiment of the present invention, following two points can be passed through: 1) relatively narrow system bandwidth, can reduce system at Sheet and promotion uplink coverage area；2) Fast synchronization of low complex degree, it is possible to reduce expense substantially reduces power consumption of terminal；Cause This, is suitable for M2M system, to realize the Fast synchronization of low complex degree in narrower system bandwidth.

Embodiment two

Referring to FIG. 4, another LTE synchronous method of the embodiment of the present invention, comprising:

210, base station equipment selects a kind group from numbering in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped Interior number, will number corresponding primary synchronization signal PSS sequence composition PSS sequence alternative collection in a kind group, a is to be less than or wait In 3 positive integer；

220, the base station equipment is b PCI points of selection from 168 physical-layer cell identifier PCI of LTE system grouping The b PCI is grouped corresponding secondary synchronization signal SSS sequence and forms SSS sequence alternative collection by group, and b is less than or equal to 168 Positive integer, the product of a and b are less than 504；

230, the base station equipment selects a PSS sequence to be sent to user equipment from the PSS sequence alternative collection, with And select a SSS sequence to be sent to user equipment from the SSS sequence alternative collection, so that the user equipment passes through inspection It surveys the PSS sequence and the SSS is synchronized.

In some embodiments of the invention, step 210 can include: select number in all three group of LTE system.Step 220 can include: subtracting 1 with c, b PCI grouping of selection, c are equal to 168/b and take downwards from 168 PCI grouping for interval It is whole；Alternatively, the preceding b PCI grouping in selection 168 PCI grouping.

In some embodiments of the invention, step 210 can include: select any one in number in three kinds of groups of LTE system Number in kind group.Step 220 can include: the preceding b PCI grouping in selection 168 PCI grouping, b are equal to PCI several N, N For the positive integer less than or equal to 168.

In some embodiments of the invention, step 210 can include: select any two in three kinds of groups of LTE system in number Number in kind group.Step 220 can include: the preceding b PCI grouping in selection 168 PCI grouping, wherein if PCI several N For even number, then b is equal to N/2；If PCI several N are odd number, b rounds up equal to N/2, and N is the positive integer less than or equal to 336.

In some embodiments of the invention, step 210 can include: select any two in three kinds of groups of LTE system in number Number in kind group.Step 220 can include: for number in the first selected group, the base station equipment selects LTE system All 168 PCI are grouped corresponding secondary synchronization signal SSS sequence, and composition corresponds to the first SSS sequence numbered in the first group Alternative collection；For numbering in selected second group, the base station equipment selects d from 168 PCI of LTE system grouping A PCI is grouped corresponding secondary synchronization signal SSS sequence, and composition corresponds to the 2nd SSS sequence alternative collection numbered in second group, D=N-168, N are PCI number, and N is the positive integer greater than 168 but less than or equal to 336.

In some embodiments of the invention, the PSS sequence and the SSS sequence are mapped to the subcarrier spacing of frequency resource Less than 15KHz.

It is appreciated that above scheme of the embodiment of the present invention can for example be embodied in base station equipment.

The present embodiment is illustrated LTE synchronous method provided by the invention from base station equipment side.About this implementation Example more detailed description, please refers to the simple introduction done above to the simultaneous techniques of LTE system, to Fig. 1 and shown in Fig. 2 wireless The simple introduction that communication system is done, and, combine Fig. 3 from user equipment side to the side of synchronization LTE of the invention in embodiment one The introduction that method is done.

Present invention method, the PSS sequence of use have an a kind, and SSS sequence has a b kind, and the product of a and b is less than 504, That is, PCI number of physical-layer cell identifier total in system, less than 504 in conventional LTE system, in this way, synchronizing When, just reduce synchronization complexity, it is possible to reduce synchronous time overhead and resource overhead.In preferred embodiment, PSS sequence and The subcarrier spacing that SSS sequence is mapped to frequency resource needs to be less than 15KHz, is suitable for narrowband M2M communication system.

For the above scheme of the better implementation embodiment of the present invention, it is also provided below and implements above scheme for cooperating Relevant apparatus.

Embodiment three

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

First detection module 510, for detecting primary synchronization signal PSS sequence, by the PSS sequence and ZC arrangement set institute Including a kind ZC sequence to do circulation related, obtain the number of the PSS sequence, a is the positive integer less than or equal to 3；

Second detection module 520, for detecting secondary synchronization signal SSS sequence, by the SSS sequence and M sequence set institute Including b kind M sequence to do circulation related, obtain the number of the SSS sequence, b is the positive integer less than or equal to 168, and a and The product of b is less than 504；

Synchronization module 530, for being synchronized using the PSS sequence and the SSS sequence that detect, wherein root 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 invention, the M sequence set includes: 168 physical-layer cell identifiers from LTE system 1 is subtracted with c in PCI grouping and is grouped corresponding SSS sequence for the b PCI that interval is selected, and c is equal to 168/b and is rounded downwards；Or Person, the preceding b PCI selected from 168 PCI of LTE system grouping are grouped corresponding SSS sequence.

In some embodiments of the invention, the ZC arrangement set includes: any one in number in three kinds of groups of LTE system The corresponding PSS sequence of number in kind group；The M sequence set includes: preceding b PCI points in 168 PCI grouping of LTE system The corresponding SSS sequence of group.

In some embodiments of the invention, the ZC arrangement set includes: any two in number in three kinds of groups of LTE system The corresponding PSS sequence of number in kind group；The M sequence set includes: preceding b PCI points in 168 PCI grouping of LTE system The corresponding SSS sequence of group.

In some embodiments of the invention, the ZC arrangement set includes: any two in number in three kinds of groups of LTE system The corresponding PSS sequence of number in kind group；The M sequence set includes: the 2 kinds of PSS corresponded respectively in the ZC arrangement set Two M sequence subclass of sequence, one of M sequence subclass include that all 168 PCI groupings of LTE system are corresponding SSS sequence, another M sequence subclass include that d PCI in LTE system is grouped corresponding SSS sequence, and d=N-168, N are PCI number, and N is the positive integer greater than 168 but less than or equal to 336；It is described to be wrapped the SSS sequence with M sequence set The b kind M sequence included does circulation correlation and comprises determining that M sequence subclass corresponding with the PSS sequence detected, by the SSS sequence It is related that column to M sequence included by the M sequence subclass do circulation.

The user equipment of the embodiment of the present invention for example can be the equipment such as mobile phone, IPAD.

It is appreciated that user equipment of the embodiment of the present invention can be used for executing the LTE synchronous method provided in embodiment one, or Person says that the function of each functional module of user equipment of the embodiment of the present invention can be according to the side of synchronization LTE provided in embodiment one Method specific implementation, specific implementation process can refer to the associated description in above method embodiment, and details are not described herein again.

Therefore in the embodiment of the present invention, the PSS sequence of use has an a kind, and SSS sequence has a b kind, and the product of a and b Less than 504, that is, total PCI number of physical-layer cell identifier in system, less than 504 in conventional LTE system, in this way, into When row is synchronous, synchronization complexity is just reduced, it is possible to reduce synchronous time overhead and resource overhead.In preferred embodiment, PSS The subcarrier spacing that sequence and SSS sequence are mapped to frequency resource needs to be less than 15KHz, is suitable for narrowband M2M communication system.

Example IV

Referring to FIG. 6, the embodiment of the present invention provides a kind of base station equipment 600, it may include:

First choice module 610, for from being numbered in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped Number in a kind group is selected, corresponding primary synchronization signal PSS sequence composition PSS sequence alternative collection will be numbered in a kind group, a is Positive integer less than or equal to 3；

Second selecting module 620, for selecting b PCI from 168 physical-layer cell identifier PCI of LTE system grouping The b PCI is grouped corresponding secondary synchronization signal SSS sequence and forms SSS sequence alternative collection by grouping, b for less than or equal to The product of 168 positive integer, a and b are less than 504；

Sending module 630, for selecting a PSS sequence to be sent to user equipment from the PSS sequence alternative collection, with And select a SSS sequence to be sent to user equipment from the SSS sequence alternative collection, so that the user equipment passes through inspection It surveys the PSS sequence and the SSS is synchronized.

In some embodiments of the invention, the first choice module 610, specifically for selecting all three of LTE system Number in group；Second selecting module 620 selects b from 168 PCI grouping for interval specifically for subtracting 1 with c A PCI grouping, c are equal to 168/b and are rounded downwards；Alternatively, the preceding b PCI grouping in selection 168 PCI grouping.

In some embodiments of the invention, the first choice module 610, specifically in three kinds of groups of selection LTE system Number in any one group in number；Second selecting module 620, specifically for selecting in 168 PCI grouping Preceding b PCI grouping, b are equal to PCI several N, and N is the positive integer less than or equal to 168.

In some embodiments of the invention, the first choice module 610, specifically in three kinds of groups of selection LTE system Number in any two kinds of groups in number；Second selecting module 620, specifically for selecting in 168 PCI grouping Preceding b PCI grouping, wherein if PCI several N are even number, b is equal to N/2；If PCI several N are odd number, b is equal to N/2 and takes upwards Whole, N is the positive integer less than or equal to 336.

In some embodiments of the invention, the first choice module 610, specifically in three kinds of groups of selection LTE system Number in any two kinds of groups in number；Second selecting module 620 is specifically used for compiling in the first selected group Number, all 168 PCI of the base station equipment selection LTE system are grouped corresponding secondary synchronization signal SSS sequence, and composition corresponds to The first SSS sequence alternative collection numbered in the first is organized；For being numbered in selected second group, the base station equipment from D PCI of selection is grouped corresponding secondary synchronization signal SSS sequence in 168 PCI grouping of LTE system, and composition corresponds to second The 2nd SSS sequence alternative collection numbered in group, d=N-168, N are PCI number, and N is greater than 168 but less than or equal to 336 Positive integer.

It is appreciated that user equipment of the embodiment of the present invention can be used for executing the LTE synchronous method provided in embodiment two, or Person says that the function of each functional module of user equipment of the embodiment of the present invention can be according to the side of synchronization LTE provided in embodiment two Method specific implementation, specific implementation process can refer to the associated description in above method embodiment, and details are not described herein again.

The embodiment of the present invention also provides a kind of wireless communication system, as shown in Figure 1, comprising: as (Fig. 5 is implemented embodiment three Example) shown in user equipment, and the base station equipment as shown in example IV (Fig. 6 embodiment).

As shown in fig. 7, the embodiment of the present invention also provides a kind of user equipment 700, the user equipment includes processor 701, memory 702, bus 703 and communication interface 704；

For storing computer executed instructions, the processor 701 passes through the memory 702 with the memory 702 The bus 703 connects, and when user equipment operation, the processor 701 executes the described of the storage of memory 702 Computer executed instructions, so that the user equipment executes the LTE synchronous method as shown in embodiment one (i.e. Fig. 3 embodiment).

As shown in figure 8, the embodiment of the present invention also provides a kind of base station equipment 800, the base station equipment includes processor 801, memory 802, bus 803 and communication interface 804；

For storing computer executed instructions, the processor 801 passes through the memory 802 with the memory 802 The bus 803 connects, and when controller operation, the processor 801 executes the meter that the memory 802 stores Calculation machine executes instruction, so that the base station equipment executes the LTE synchronous method as shown in embodiment two (i.e. Fig. 4 embodiment).

The embodiment of the present invention also provides a kind of computer storage medium, including computer executed instructions, for computer When processor executes the computer executed instructions, the computer executes the LTE as shown in embodiment one (i.e. Fig. 3 embodiment) Synchronous method.

The embodiment of the present invention also provides a kind of computer storage medium, including computer executed instructions, for computer When processor executes the computer executed instructions, the computer executes the LTE as shown in embodiment two (i.e. Fig. 4 embodiment) Synchronous method.

In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in some embodiment Part, may refer to the associated description of other embodiments.

It should be noted that for the various method embodiments described above, for simple description, therefore, it is stated as a series of Combination of actions, but those skilled in the art should understand that, the present invention is not limited by described sequence of movement because according to According to the present invention, certain steps can use other sequences or carry out simultaneously.Secondly, those skilled in the art should also know that, The embodiments described in the specification are all preferred embodiments, and not necessarily the present invention must for related actions and modules Must.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage Medium may include: ROM, RAM, disk or CD etc..

It is provided for the embodiments of the invention LTE synchronous method and relevant device above and system is described in detail, Used herein a specific example illustrates the principle and implementation of the invention, and the explanation of above embodiments is only used In facilitating the understanding of the method and its core concept of the invention；At the same time, for those skilled in the art, according to the present invention Thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as Limitation of the present invention.

Claims

1. a kind of long term evolution LTE synchronous method, which is characterized in that be applied to machine part and communicate M2M system, the method packet It includes:

User equipment detects primary synchronization signal PSS sequence, by a kind ZC sequence included by the PSS sequence and ZC arrangement set It is related to do circulation, 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 and b kind M sequence included by M sequence set are done 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；

Synchronized using the PSS sequence and the SSS sequence that detect, wherein according to the number of the PSS sequence and The number of the SSS sequence determines physical-layer cell identifier PCI；

The subcarrier spacing that the PSS sequence and the SSS sequence are mapped to frequency resource is less than 15KHz；

Wherein, the M sequence set includes: and subtracts 1 from 168 physical-layer cell identifier PCI of LTE system grouping with c to be It is spaced the b PCI selected and is grouped corresponding SSS sequence, c is equal to 168/b and is rounded downwards；Alternatively, from 168 of LTE system The preceding b PCI selected in PCI grouping is grouped corresponding SSS sequence.

2. according to the method described in claim 1, it is characterized by:

The ZC arrangement set includes: the corresponding PSS sequence of the interior number of any one group in three kinds of groups of LTE system in number Column；

The M sequence set includes: that the preceding b PCI in 168 PCI grouping of LTE system is grouped corresponding SSS sequence.

3. according to the method described in claim 1, it is characterized by:

The ZC arrangement set includes: the corresponding PSS sequence of the interior number of any two kinds of groups in three kinds of groups of LTE system in number Column；

4. according to the method described in claim 1, it is characterized by:

The M sequence set includes: two M sequence subsets of the 2 kinds of PSS sequences corresponded respectively in the ZC arrangement set It closes, one of M sequence subclass includes that all 168 PCI of LTE system are grouped corresponding SSS sequence, another M sequence Subclass includes that d PCI in LTE system is grouped corresponding SSS sequence, and d=N-168, N are PCI number, and N is greater than 168 But it is less than or equal to 336 positive integer；

It is described that the SSS sequence done to circulation is related to include: to b kind M sequence included by M sequence set

It determines M sequence subclass corresponding with the PSS sequence detected, the SSS sequence and the M sequence subclass is wrapped It is related that the M sequence included does circulation.

5. a kind of long term evolution LTE synchronous method, which is characterized in that be applied to inter-machine communication M2M system, the method packet It includes:

Base station equipment selects to number in a kind group from numbering in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped, Corresponding primary synchronization signal PSS sequence composition PSS sequence alternative collection will be numbered in a kind group, a is just less than or equal to 3 Integer；

Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping, by the b A PCI is grouped corresponding secondary synchronization signal SSS sequence and forms SSS sequence alternative collection, and b is the positive integer less than or equal to 168, a Product with b is less than 504；

The base station equipment selects a PSS sequence to be sent to user equipment from the PSS sequence alternative collection, and, from institute Stating in SSS sequence alternative collection selects a SSS sequence to be sent to user equipment, so that the user equipment passes through described in detection PSS sequence and the SSS are synchronized；

Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping includes: with c Subtracting 1, b PCI grouping of selection, c are equal to 168/b and are rounded downwards from 168 PCI grouping for interval；Alternatively, selection institute State the preceding b PCI grouping in 168 PCI groupings.

6. according to the method described in claim 5, it is characterized by:

The base station equipment selects to compile in a kind group from numbering in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped It number include: number in any one group in three kinds of groups for select LTE system in number；

Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping includes: choosing The preceding b PCI grouping in 168 PCI grouping is selected, b is equal to PCI several N, and N is the positive integer less than or equal to 168.

7. according to the method described in claim 5, it is characterized by:

The base station equipment selects to compile in a kind group from numbering in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped It number include: number in any two kinds of groups in three kinds of groups for select LTE system in number；

Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping includes: choosing Select the preceding b PCI grouping in 168 PCI grouping, wherein if PCI several N are even number, b is equal to N/2；If PCI number N is odd number, and b rounds up equal to N/2, and N is the positive integer less than or equal to 336.

8. according to the method described in claim 6, it is characterized by:

Base station equipment b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping, by the b A PCI is grouped corresponding secondary synchronization signal SSS sequence and forms SSS sequence alternative collection further include:

For number in the first selected group, all 168 PCI groupings of the base station equipment selection LTE system are corresponded to Secondary synchronization signal SSS sequence, composition correspond to the first group in number the first SSS sequence alternative collection；For selected Number in second group, base station equipment d PCI grouping of selection from 168 PCI of LTE system grouping are corresponding auxiliary same Signal SSS sequence is walked, composition corresponds to the 2nd SSS sequence alternative collection numbered in second group, and d=N-168, N are PCI Number, and N is the positive integer greater than 168 but less than or equal to 336.

9. a kind of user equipment, which is characterized in that be applied to machine part and communicate M2M system, the user equipment includes:

First detection module, for detecting primary synchronization signal PSS sequence, by a included by the PSS sequence and ZC arrangement set Kind ZC sequence does circulation correlation, obtains the number of the PSS sequence, and a is the positive integer less than or equal to 3；

Second detection module, for detecting secondary synchronization signal SSS sequence, by b included by the SSS sequence and M sequence set It is related that kind of M sequence does circulation, obtains the number of the SSS sequence, and b is the positive integer less than or equal to 168, and the product of a and b Less than 504；

Synchronization module, for being synchronized using the PSS sequence and the SSS sequence that detect, wherein according to described The number of PSS sequence and the number of the SSS sequence determine physical-layer cell identifier PCI；

10. user equipment according to claim 9, it is characterised in that:

11. user equipment according to claim 9, it is characterised in that:

12. user equipment according to claim 9, it is characterised in that:

13. a kind of base station equipment, which is characterized in that be applied to machine part and communicate M2M system, the base station equipment includes:

First choice module, for selecting a kind from numbering in three kinds of groups that the physical-layer cell identifier PCI of LTE system is grouped Number in group, will number corresponding primary synchronization signal PSS sequence composition PSS sequence alternative collection in a kind group, a be less than or Positive integer equal to 3；

Second selecting module will for b PCI grouping of selection from 168 physical-layer cell identifier PCI of LTE system grouping The b PCI is grouped corresponding secondary synchronization signal SSS sequence and forms SSS sequence alternative collection, and b is just whole less than or equal to 168 The product of number, a and b are less than 504；

Sending module, for from the PSS sequence alternative collection select a PSS sequence be sent to user equipment, and, from institute Stating in SSS sequence alternative collection selects a SSS sequence to be sent to user equipment, so that the user equipment passes through described in detection PSS sequence and the SSS are synchronized；

Second selecting module is interval b PCI points of selection from 168 PCI grouping specifically for subtracting 1 with c Group, c are equal to 168/b and are rounded downwards；Alternatively, the preceding b PCI grouping in selection 168 PCI grouping.

14. base station equipment according to claim 13, it is characterised in that:

The first choice module, specifically for number in any one group in number in three kinds of groups of selection LTE system；

Second selecting module, specifically for selecting the preceding b PCI in 168 PCI grouping to be grouped, b is equal to PCI Number N, N are the positive integer less than or equal to 168.

15. base station equipment according to claim 13, it is characterised in that:

The first choice module, specifically for being numbered in any two kinds of groups in number in three kinds of groups of selection LTE system；

Second selecting module, specifically for selecting the preceding b PCI in 168 PCI grouping to be grouped, wherein if PCI Number N is even number, then b is equal to N/2；If PCI several N are odd number, b rounds up equal to N/2, and N is just less than or equal to 336 Integer.

16. base station equipment according to claim 13, it is characterised in that:

Second selecting module is specifically used for selecting LTE system for number, the base station equipment in the first selected group All 168 PCI of system are grouped corresponding secondary synchronization signal SSS sequence, and composition corresponds to the first SSS numbered in the first group Sequence alternative collection；For numbering in selected second group, the base station equipment is selected from 168 PCI of LTE system grouping It selects d PCI and is grouped corresponding secondary synchronization signal SSS sequence, it is alternative that composition corresponds to the 2nd SSS sequence numbered in second group Collection, d=N-168, N are PCI number, and N is the positive integer greater than 168 but less than or equal to 336.

17. a kind of machine part communicates M2M system characterized by comprising

User equipment as described in any in claim 9 to 12, and, the base station as described in any in claim 13 to 16 Equipment.

18. a kind of user equipment, which is characterized in that be applied to machine part and communicate M2M system, the user equipment includes processing Device, memory, bus and communication interface；The memory for storing computer executed instructions, deposit with described by the processor Reservoir is connected by the bus, and when user equipment operation, the processor executes the described of the memory storage Computer executed instructions, so that the user equipment executes the LTE synchronous method as described in any in claim 1-4.

19. a kind of base station equipment, which is characterized in that be applied to machine part and communicate M2M system, the base station equipment includes processing Device, memory, bus and communication interface；

For storing computer executed instructions, the processor is connect with the memory by the bus memory, When user equipment operation, the processor executes the computer executed instructions of the memory storage, so that institute State LTE synchronous method of the user equipment execution as described in any in claim 5-8.

20. a kind of computer storage medium, including computer executed instructions, so that the processor of computer executes the computer When executing instruction, the computer executes the LTE synchronous method as described in any in claim 1-4.

21. a kind of computer storage medium, including computer executed instructions, so that the processor of computer executes the computer When executing instruction, the computer executes the LTE synchronous method as described in any in claim 5-8.