WO2009082940A1

WO2009082940A1 - Method, system and apparatus for transmitting, receiving sync sequence

Info

Publication number: WO2009082940A1
Application number: PCT/CN2008/073589
Authority: WO
Inventors: Guoqiong Cao; Junwei Wang; Xiaoan Fan; Xuan Feng
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-12-19
Filing date: 2008-12-19
Publication date: 2009-07-09
Also published as: CN101465830B; CN101465830A

Abstract

A method for transmitting sync sequence is provided, for systems having different sub-carrier width, sync sequence which possess same frequency resource but whose length is different is sent, or sync sequence which possess different frequency resource but whose length is same is sent. Corresponding receiving method, and system and apparatus processing the method are provided. The above transmitting method and system can take other information about area besides taking area ID, the corresponding method and apparatus for receiving sync sequence by the terminal can make the terminal obtain other information about area besides area ID.

Description

Method and system for transmitting and receiving synchronization sequence, device

The present invention relates to the field of wireless communication technologies, and in particular, to a method, system, and apparatus for transmitting and receiving a synchronization sequence.

Background technique

In a communication system, several different frequency bands may be used. For example, in the LTE system, a frequency band dedicated to MBMS service transmission is called a dedicated carrier (DC), and a cell using a DC transmission service is called an MBMS dedicated cell. There is also a frequency band for transmitting a unicast service, called a unicast carrier (UC), and a cell using a UC transmission service is called a unicast cell. The other is a frequency band used for hybrid transmission of unicast and MBMS services, called Mixed Carrier (MC), and a cell using MC transmission service is called a mixed cell.

The following takes the LTE system as an example to introduce its basic subframe structure and basic transmission format. Reference Map Each sub-frame is divided into 2 slots, each of which contains several OFDM symbols.

In the case of systems using unicast carrier or hybrid carrier (UC/MC) for transmission, there are two basic transmission schemes, see Table 1:

Table 1 :

Among them, there are 6 kinds of system bandwidths in the format 1 and format 2 in Table 1: 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz, the corresponding FFT points are 128, 256, 512, 1024, 1536 and 2048, respectively, wherein the 5MHz bandwidth corresponds to 512 points. In the case where the system uses a dedicated carrier (DC) for transmission, there are also two basic transmission formats, see Table 2: Table 2:

Among them, Format 3 in Table 2 has 6 kinds of system bandwidths: 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz, corresponding FFT points are 256, 512, 1024, 1536, 2048 and 2048, respectively, where 5MHz bandwidth corresponds The number of FFT points is 1024. Referring to FIG. 2, it is a schematic diagram of a transmission structure on a time slot of Format 1, Format 2, Format 3, and Format 4 in Tables 1 and 2 above. Wherein, the left twill (45. slash) indicates a short CP, the right twill (135. slash) indicates a long CP; the normal length is a blank portion between the left twill or the right twill in FIG. 2; the subcarrier spacing is a subcarrier width.

In the prior art, only the UC/MC, that is, the synchronization information transmission and reception method under the sub-carrier width of 15 kHz is used, and the synchronization sequence is mapped to the time-frequency resource occupied by the synchronization channel (SCH, Synchronization Channel), and is sent out. The terminal detects the synchronization sequence and operates to learn information about the synchronization.

Specifically, referring to FIG. 3, it is a frequency of a system occupying a 15 kHz subcarrier width in the prior art. Schematic diagram of the domain structure, for a communication system with a subcarrier spacing of 15 kHz, for example, the synchronization channel in the foregoing format 1 or format 2 in the case of UC/MC, occupying the center bandwidth of the system bandwidth of 960 kHz in the frequency domain, occupying 64 of the center Subcarriers.

Referring to FIG. 4, which is a schematic structural diagram of a synchronization channel in the time domain in the prior art (frame structure location map of format 1): a synchronization channel is located in the 0th and 5th subframes of a radio frame, where the primary synchronization channel (P) -SCH, Primary-SCH) The last symbol in the first slot of subframe 0 and subframe 5, which is represented by a grid in the figure, and the secondary synchronization channel (S-SCH, Secondary-SCH) is located in the slot. The penultimate symbol is represented by a left twill (45. slash) and a right twill (135. slash).

The primary synchronization channel carries the primary synchronization sequence, and the secondary synchronization channel carries the secondary synchronization sequence. In the prior art, there are three primary synchronization sequences and 170 secondary synchronization sequences. In the prior art, the synchronization channel can also carry a cell ID, wherein the primary synchronization channel carries one of three "intra-group IDs", which are distinguished by the three primary synchronization sequences, and the secondary synchronization channel carries 170 "ID groups. No. ", distinguished by the 170 secondary synchronization sequences. Thus, the prior art synchronization channel can carry 510 cell IDs. The cell ID is one of the information about the cell and is used to distinguish different cells. After receiving the above synchronization sequence, the terminal can know the above cell ID according to the analysis.

The above-described prior art synchronization channel P-SCH and S-SCH structures are only applicable to UC/MC with a subcarrier width of 15 kHz. Among them, P-SCH uses a ZC sequence with a length of 63, and the base sequence indicators are 25, 29, and 34, respectively.

However, since the above-described prior art synchronization channel structure is only applicable to UC/MC of 15 kHz subcarrier width, it cannot carry more information about the area. The "region" herein refers to a space that can independently carry a sequence corresponding to the synchronization channel SCH, and the space may be a space defined by any one-dimensional or multi-dimensional combination of time, space and frequency three-dimensional, including sectors in the prior art. , the concept of the cell, the same frequency network area (SFN Area, Single Freq terminal ncy Network Area). For example, information on the subcarrier width of the system in which the region is located (for example, 15 kHz or 7.5 kHz), or region type information (for example, a UC/MC region or a DC region) at the same subcarrier width. That is, the method of transmitting using the existing synchronization sequence cannot carry information about the area other than the cell ID, and the corresponding terminal is connected. The method of receiving the synchronization sequence cannot acquire other information about the area other than the cell ID.

Summary of the invention

In view of this, the embodiment of the present invention provides a synchronization sequence sending method, which can carry more information about a region, and correspondingly, provides a synchronization sequence receiving method, so that the terminal can acquire more information about the region.

One embodiment of the present invention provides a synchronization sequence transmission method for different synchronization sequences having the same length but occupying different frequency resources.

Corresponding to the foregoing synchronization sequence sending method, the specific implementation manner of the present invention further provides a method for a terminal to process a synchronization sequence, including: the terminal obtaining a correlation or matching result of the received signal, where the correlation or matching result corresponds to a subcarrier bandwidth of the system, and Corresponding to the transmitted synchronization sequence; comparing the size of the correlation or matching result to obtain a maximum value; obtaining the subcarrier bandwidth of the network side and the synchronization sequence used by the network side according to the subcarrier bandwidth corresponding to the maximum value and the synchronization sequence thereof .

Another embodiment of the present invention provides a system for performing the above method, the synchronization sequence transmission system, comprising:

a first sequence sending subsystem, configured to send a synchronization sequence occupying the same frequency resource but different lengths for different sub-carrier width systems; or a second sequence sending subsystem, configured to send the same length but occupy different frequency resources Synchronization sequence.

The embodiment of the present invention further provides a synchronization sequence receiving apparatus, which includes the following units: a receiving unit: configured to obtain a correlation or matching result of a received signal, where the correlation or matching result corresponds to a subcarrier bandwidth of the system, and a corresponding network The synchronization sequence sent by the side;

Comparing unit: for comparing the size of the correlation or matching result, obtaining a maximum value; acquiring unit: configured to obtain a subcarrier bandwidth of the system and a network side according to the subcarrier bandwidth corresponding to the maximum value and the synchronization sequence thereof The synchronization sequence sent.

The embodiment of the present invention further provides another synchronization sequence receiving apparatus, which comprises the following units: a sampling rate processing unit: used for using two different sampling rates for the received signal. S ₂ ii is sampled, S ₂ = S , x2 , and 8 , which is the sampling rate corresponding to the bandwidth occupied by M † P-SCH, and S is the bandwidth of the subcarrier width of M † P-SCH. Corresponding sampling rate;

The number is correlated or matched, and the correlation or matching result Y _SiUn , i=l, 2, n=l, 2, 3 is obtained, wherein the corresponding sampling rate S or S and the sequence index u„, the local sequence is local on the terminal side a sequence generated or stored corresponding to a known network side P-SCH transmission sequence; a decision unit: used to compare all correlation or matching results at all sampling rates, and determine a subcarrier width of the searched region according to the maximum value Information, and get synchronization information.

In each of the above embodiments, the transmitting method and system can carry information about the area other than the cell ID, and the method and apparatus for receiving the synchronization sequence by the terminal corresponding to the cell can enable the terminal to acquire other information about the area other than the cell ID.

DRAWINGS

1 is a schematic diagram of a frame structure of an LTE system in the prior art;

2 is a schematic diagram of a basic transmission format of an LTE system in the prior art;

3 is a schematic diagram of a frequency domain of a 15 kHz subcarrier width system in the prior art;

4 is a schematic diagram of a position of a synchronization channel P-SCH and an S-SCH in a frame structure in the prior art;

FIG. 5 is a flowchart of a synchronization sequence sending method according to Embodiment 1 of the present invention; FIG.

6 is a frequency domain structure diagram of two subcarrier systems provided in Embodiment 1 of the present invention; FIG. 7 is a schematic structural diagram of a synchronization sequence transmission system according to Embodiment 1 of the present invention.

detailed description

A specific embodiment of the present invention provides a synchronization sequence transmission method, which is a synchronization sequence having the same length but different frequency resources. Corresponding to the foregoing synchronization sequence sending method, the method for processing, by the terminal, the synchronization sequence includes: obtaining, by the terminal, correlation or matching of the received signal If the correlation or matching result corresponds to the subcarrier bandwidth of the system and the corresponding synchronization sequence is sent; comparing the size of the correlation or the matching result to obtain a maximum value; obtaining the network according to the subcarrier bandwidth corresponding to the maximum value and the synchronization sequence thereof The subcarrier bandwidth on the side and the synchronization sequence used on the network side.

DETAILED DESCRIPTION OF THE INVENTION In the present embodiment, a method for transmitting and receiving a synchronization sequence is provided, which can indicate the subcarrier width of different systems.

The network side of the communication system can be one or more different base stations. Referring to Figure 5, perform the following steps:

511. For a subcarrier width of M 々 system, generate n1 ZC sequences of length L1, base sequence indicators respectively u, u, , u, nl is a natural number, and nl≤3, the nl sequences have high autocorrelation And low cross-correlation properties, and ^LI- UU, the base sequence index u„, u ₁₂ , ..., u _{lnl is} near L1/2;

512. For a system with a subcarrier width of M ₂ , generate n2 lengths of L2,

L2=[Ll/2j, the indices of the base sequence are the ZC sequences of u _2i , u ₂₂ , , u _2η2 , respectively, n2 is a natural number, and η2≤3, the n2 sequences have high autocorrelation and low cross-correlation properties, and u ₂₂ = L2- u _2ΐ , the base sequence index u _2i , u ₂₂ , ... , u _{2n2 is} near L2/2; and the ZC sequences of the aforementioned lengths LI and L2 have low cross-correlation properties;

In particular, the process of generating a sequence can be either calculated or obtained from a stored sequence.

513. For a system with a subcarrier width of M 々, mapping the above N1 ZC sequences whose length is L1 and whose base sequence indicators are u, u, . . . , u respectively to the primary synchronization channel P-SCH Sending the synchronization sequence on the time-frequency resource;

S14. For a system with a subcarrier width of M ₂ , the n2 lengths are

L2, the ZC sequence of the base sequence index u _2i , u ₂₂ , and u _2n2 is mapped to the time-frequency resource occupied by the P-SCH, and the synchronization sequence is transmitted.

Thus, there are sequences of the above-mentioned nl + n2 possible transmissions to the transmitting end. For the terminal side, use the following steps:

521. Correlate or match with the received signal by using the local sequence to obtain nl+n2 correlation or matching result Y _Mi l≤nj≤ni, = l,2, ni≤3, the system corresponding to the matching or matching result Y _MiUi The subcarrier bandwidth is Mi, and the index of the synchronization sequence sent by the corresponding network side is u„,., the local sequence is locally generated or stored on the terminal side, and the known network side primary synchronization channel P-SCH Sending the sequence corresponding to the sequence, that is, the aforementioned nl + n2 sequences;

522. Compare the size of the correlation or matching result, and take a maximum value;

523. Determine, according to the maximum value, a subcarrier bandwidth of a system where the transmitting end is located and a synchronization sequence used by the system.

The following is a specific example. In this embodiment, a system including two sub-carrier widths: 15 kHz sub-carrier width and 7.5 kHz sub-carrier width, the specific method in this example is:

On the network side:

531. For a system with a subcarrier width of 15 kHz, a ZC sequence of length 63 may have a base sequence index of 25 or 29 or 34, and a sequence of length 63 is preceded by a complex number of 0 to form an actual length of 64. a sequence, mapped to 64 subcarriers of the center bandwidth of the 15 kHz subcarrier width system;

532. For a system with a subcarrier width of 7.5 kHz, a ZC sequence of length 127 has a base sequence index of 61 or 65 or 66, and a complex number of 0 is added in front of the sequence of length 127. A sequence of actual length 128 is mapped onto 128 subcarriers of the center bandwidth of the 7.5 kHz subcarrier width system.

These three lengths are 127, and the base sequence indices are 61, 65, 66 ZC sequences, respectively, satisfying =nl, u ₂ =127-nl, u ₃ =n2, ie, two base sequence indicators are complementary to the sequence length 127 Relationship, and the three base sequence indicators are all near half of 64 of 127; the three ZC sequences of length 127 have ideal autocorrelation and cross-correlation properties; and satisfy the length of 63, the indicators are 25, 29, 34 The three base sequences are low cross-correlated.

The structure of the frequency domain formed by the above mapping method is shown in Fig. 6.

On the terminal side: The local matching sequence used is also the above six sequences, that is, the ZC sequence having a length of 63 base sequence indicators of 25 and 29 and 34, and a ZC sequence having lengths of 127 base sequence indices of 61 and 65 and 66, respectively.

541. The terminal side performs correlation or matching with the received signals by using the above six sequences, and obtains correlation or matching results of A, B, C, D, E, and F. The A corresponds to a subcarrier with a system of 15 kHz and a ZC sequence with an index of 25, B corresponds to a subcarrier with a system of 15 kHz and a ZC sequence with an index of 29, C corresponds to a subcarrier with a system of 15 kHz and a ZC sequence with an index of 34, D The system corresponding to the subcarrier is 7.5 kHz and the ZC sequence with the index of 61, E corresponds to the subcarrier with 7.5 kHz system and the index is 65 ZC sequence, F corresponds to the subcarrier with 7.5 kHz system and the index is 66 for the ZC sequence respectively. .

542, compare the size of A to F, take the maximum value,

543. Determine, according to the maximum value, a subcarrier width and a synchronization sequence used by the system of the transmitting end corresponding to the terminal side. The subcarrier width corresponding to the maximum value and the sequence corresponding to the maximum value are the subcarrier bandwidth on the network side and the synchronization sequence transmitted on the network side. For example, if the maximum is A, it can be determined that the network side sends a ZC sequence with a length of 63 and an indicator of 25 under 15 kHz subcarriers; if the maximum is E, it can be determined that the network side transmits 7.5 kHz. A ZC sequence with a length of 63 and an indicator of 65 under the subcarrier.

The embodiment further provides a synchronization sequence receiving apparatus, including the following units: a receiving unit: the receiving unit is configured to obtain a correlation or matching result of the received signal, and the correlation or matching result corresponds to a subcarrier bandwidth of the system, and the corresponding network The synchronization sequence sent by the side; the comparison unit: used to compare the size of the correlation or matching result, and obtain the maximum value; the obtaining unit: used to obtain the subcarrier bandwidth of the system according to the subcarrier bandwidth corresponding to the maximum value and the synchronization sequence thereof The synchronization sequence sent by the network side. The above synchronization sequence receiving device is on the terminal.

In the specific embodiment, the beneficial effects are as follows: Since the three ZC sequences of length 127 have ideal autocorrelation and cross-correlation properties, and they have lower cross-correlation properties with the ZC sequence of length 63, The terminal can obtain the synchronization information (the length and index of the synchronization sequence) by separately searching 6 ZC sequences of the P-SCH (three ZC sequences of 63 lengths at 15 kHz and three ZC sequences of 127 lengths of 7.5 kHz). At the same time, subcarrier width information can also be obtained. At the same time, it can be seen that the length of 127 is such that the P-SCH at a subcarrier width of 7.5 kHz and the P-SCH with a sequence length of 63 at a subcarrier width of 15 kHz occupy the same frequency bandwidth, so that their synchronization performance is similar. In another embodiment, when a plurality of adjacent DC MBMS regions are not synchronized, three P-SCH sequences may not be needed, and only one or two of the above sequences may be used.

The embodiment further provides a sequence sending system. Referring to FIG. 7, the first sequence sending subsystem, the system specifically includes: a first sequence generating unit: configured to generate n1 for a system with a subcarrier width of ^! The length is L1, the base sequence index is the ZC sequence of u, u, , u, respectively, nl is a natural number, and nl ≤ 3, the nl sequence has high autocorrelation and low cross-correlation properties, and u _i2 = L1-u , the base sequence index u , u , , u is near L1/2; First sequence processing unit: for a system with a subcarrier width of M, mapping the above n1 ZC sequences of length L1 and base sequence indicators u, u, ..., u to primary synchronization The synchronization sequence is transmitted on the time-frequency resource occupied by the channel P-SCH; the second sequence generating unit is configured to generate n2 lengths L2, L2 for a system with a subcarrier width of M ₂ , M ₂ = M _L 2 = [L1/2J , the base sequence indicators are u ₂₁ , u ₂₂ , , u _2n2

ZC sequence, n2 is a natural number, and η2≤3, the n2 sequences have high autocorrelation and low cross-correlation properties.

JL u ₂₂ = L2- u ₂₁ , the base sequence index u ₂₁ , u ₂₂ , , u _{2n2 is} near L2/2; and the aforementioned length

LI, L2 has a low cross-correlation property between the ZC sequences; Second sequence processing unit: For a system with a subcarrier width of M ₂ , M ₂ = M _L 2 , the above n2 lengths are L2, L2= [ L1/2J, the base sequence index is u ₂₁ , u ₂₂ , , u _2n2 ZC sequence is mapped to the time-frequency resource occupied by the P-SCH, and the synchronization sequence is transmitted. In an actual communication system, the first sequence generating unit and the first sequence processing unit are in the same base station, and the second sequence generating unit and the second sequence processing unit are in the same base station. The first sequence transmission subsystem may be a base station or multiple base stations. When the first sequence transmission subsystem is a base station, the first sequence generation unit and the first sequence processing unit and the second sequence generation unit and the second sequence processing unit are in the same base station. Specifically, the DC area of the 7.5 kHz sub-carrier width is taken as an example, and the transmitting apparatus of the P-SCH at one base station includes: a sequence generating unit: generating a length of 127, and the base sequence indicator is 61, 65, or 66. A sequence of ZC sequences; a sequence processing unit: a sequence of length 127 is preceded by a complex number of 0 to form a sequence of actual length 128, and the sequence is mapped to the 7.5 in the time resource corresponding to the P-SCH. The kHz subcarrier width is on the 128 subcarriers of the system center bandwidth, and then the processing of the time-frequency resources is performed. In a specific implementation manner, a method for transmitting and receiving a synchronization sequence is provided, which can indicate sub-carrier width information of a system, such as a 7.5 kHz sub-carrier width or a 15 kHz sub-carrier width, when a certain sub-carrier width system When a certain area type is used, information of the area type may also be indicated. For example, when the area of the 7.5 kHz sub-carrier width is necessarily a DC area, whether the DC area or the UC/MC area is indicated by the present embodiment may be used.

On the network side:

551. Generate n sequence lengths of L, and base sequence indicators are respectively _Ul , u ₂ , ,

ZC sequence, n is a natural number, n≤3, the n sequences have high autocorrelation and low cross-correlation properties, and u ₂ = L- _Ul , and the base sequence index u ₂ , , ^ is nearby;

552. For a sub-carrier width system, mapping the foregoing ZC sequence to a time-frequency resource occupied by a sub-carrier width system P-SCH, and sending the same;

For the system of Μ ₂ and sub-carrier width, the ZC sequence is mapped to the time-frequency resource occupied by the P-SCH of the Μ ₂ sub-carrier width system, and is sent out.

On the terminal side:

561. For the received signal, the terminal uses two different sampling rates 8 ₁ and 8 ₂ for sampling, S ₂ =S, x2, and 8, which is a subcarrier width of M † P-SCH occupied by the bandwidth corresponding to The sampling rate, 8 ₂ is the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is;

562. Using a local sequence to correlate or match the received signals with different sampling rates, to obtain ηχ2 correlation or matching result Y _SiUn , i=l, 2, n= 1, 2, 3, where Y _SA corresponds to 釆Sample rate

S _t and the network-side index sequence transmitted u _n, the local sequence is locally generated or stored in the terminal side of the sequence corresponding to the sequence of known network side transmits P-SCH;

563. Comparing the above ηχ2 correlations or matching results Y _{su to} obtain a maximum value; S64. Determine, according to the maximum value, a subcarrier width on the network side of the area and a synchronization sequence on the network side. The subcarrier width corresponding to the sampling rate corresponding to the maximum value and the sequence corresponding to the maximum value are the subcarrier bandwidth on the network side and the synchronization sequence used on the network side. Hereinafter, a case where the system includes a DC region of 7.5 kHz subcarrier width and a UC/MC region of 15 kHz subcarrier width will be specifically described as an example.

On the network side:

571. For a UC/MC area of a 15 kHz subcarrier, a ZC sequence with a length of 63 and a base sequence index of 25, 29, and 34 is mapped to a time-frequency resource occupied by a P-SCH of a 15 kHz subcarrier width system, and sent. Go out

572. For the DC region of the 7.5 kHz subcarrier width, the same sequence as the ZC sequence used by the P-SCH under the 15 kHz subcarrier (ie, the ZC sequence with a sequence length of 63 and a base sequence index of 25, 29, and 34, respectively) ), mapped to the time-frequency resource occupied by the P-SCH of the 7.5 kHz sub-carrier width system, and sent out;

In this embodiment, the sequence of length 63 makes the P-SCH occupied by the 7.5 kHz subcarrier width occupy a half of the bandwidth occupied by the P-SCH under the original 15 kHz subcarrier, thereby reducing the P-SCH. Occupancy of system resources of 7.5 kHz sub-carrier width; since the system of 7.5 kHz sub-carrier width and the system of 15 kHz sub-carrier width use the same P-SCH sequence, the compatibility of the communication system is enhanced.

On the terminal side: the steps of performing the foregoing terminal specifically include:

S81. The terminal compares or matches the received signal with a sampling rate of 0.96 MHz and then uses three local sequences. The local sequence is a ZC sequence with a sequence length of 63 and a base sequence index of 25, 29, and 34, respectively. The correlation or matching result obtained is eight, B, and C, respectively, corresponding to the received signals obtained by the ZC local sequence with the index of 25, 29, 34, and length 63, and the sample rate of 0.96 MHz. The result of the matching is 0.96 MHz, which is the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is 15 kHz.

582. Correlate or match the received signals with the sampling rate of 0.48 MHz and then use the three local sequences. The correlation or matching result obtained by, for example, D, E, and F, corresponding to the received signal of the ZC local sequence with the index of 25, 29, 34, and length 63 and the sampling rate of 0.48 MHz, respectively, is obtained, 0.48 MHz is the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is 7.5 kHz.

583, compare the size of A to F, get the maximum value,

584. Obtain an indicator of the subcarrier width and the sequence on the network side according to the maximum value. The subcarrier width corresponding to the sampling rate corresponding to the maximum value and the sequence corresponding to the maximum value are the subcarrier bandwidth on the network side and the synchronization sequence used on the network side.

Assuming that the maximum is A, it can be determined that the transmitting end sends a ZC sequence with a length of 63 and an index of 25 under the 15 kHz subcarrier. If the maximum is E, it can be determined that the length of the 7.5 kHz subcarrier transmitted by the transmitting end is 63. The ZC sequence with a score of 29, and so on. In the present embodiment, since the ZC sequence of length 63 has relatively ideal autocorrelation and cross-correlation properties; and the cross-correlation between the original 63 long sequence and the sequence formed by the semi-sequence half is relatively low, the pass can be guaranteed. The above search selects the correct result. In this embodiment, a system for performing the foregoing sequence sending method, that is, a second sequence sending system, specifically includes:

The third sequence generating unit is configured to generate n ZC sequences of sequence length L and base sequence indicators respectively _U1 , u ₂ , , u _n , n is a natural number, n≤3, and the n sequences have high autocorrelation and Low cross-correlation properties, and u^ L- U and base sequence indicators, u ₂ , , in! The third sequence processing unit is configured to: for the system of the sub-carrier width, map the ZC sequence to the time-frequency resource occupied by the carrier width system P-SCH, and send the same; The fourth sequence processing unit is configured to: for the system of M ₂ , M ₂ = M i X2 sub-carrier width, map the ZC sequence to the time-frequency resource occupied by the P-SCH of the M ₂ sub-carrier width system, and send the same. In an actual communication system, the third sequence generating unit and the third sequence processing unit are in the same base station, and the third sequence generating unit and the fourth sequence processing unit are in the same base station. The second sequence transmission subsystem may be a base station or multiple base stations. When the second sequence transmission subsystem is a base station, the third sequence generation unit is in the same base station as the third sequence processing unit and the fourth sequence processing unit. As can be seen from the above scheme, when the second sequence transmission subsystem is a base station, only a third sequence generation unit is needed in the system, that is, the third sequence generation unit is reused, thereby enhancing system compatibility and reducing the compatibility. The complexity of the device. Specifically, for a DC region of a 15 kHz or 7.5 kHz subcarrier width, the P-SCH transmitting apparatus includes: a sequence generating unit: generating a ZC sequence having a length of 63 and a base sequence indicator of one of 25, 29, or 34; Processing unit: The sequence of length 63 is preceded by a complex number of 0 to form a sequence of actual length 64. In the time resource corresponding to the P-SCH, the sequence is mapped to the 15 kHz or 7.5 kHz subcarrier width. On the 64 subcarriers of the system center bandwidth, the processing of time-frequency resources is then performed.

The present embodiment further provides yet another synchronization sequence receiving apparatus, comprising the following units: a sampling rate processing unit: for using two different sampling rates for the received signal

S ₂ performs sampling, 8 ₂ = 8 ^ 2, and S i is a sampling rate corresponding to the bandwidth occupied by M † P-SCH, and S ₂ is occupied by P-SCH when the subcarrier width is M ₂ . The sampling rate corresponding to the bandwidth,

The number is correlated or matched to obtain the correlation or matching result Y _SiUn , i=l, 2, n=l, 2, 3 , where 丫^ The sampling rate or S ₂ and the sequence index u „ , the local sequence is a sequence locally generated or stored on the terminal side corresponding to the known network side P-SCH transmission sequence; Decision unit: used to compare all 釆All the correlation or matching results under the sample rate, the subcarrier width information of the searched area is judged according to the maximum value, and the synchronization information is obtained.

The above synchronization sequence receiving device is on the terminal.

Taking the subcarrier width system of 7.5 kHz and 15 kHz as an example, the receiving apparatus of the P-SCH includes: a sampling rate processing unit: The control uses different sampling rates for the received signals, for example, 0.96 MHz and 0.48 MHz, 0.96MHz corresponds to the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is 15 kHz, and 0.48 MHz corresponds to the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is 7.5 kHz;

Search unit: The received signals processed by different sampling rates such as 0.96MHz and 0.48MHz are respectively correlated or matched with the locally stored ZC local sequence of length 63 and base sequence index of 25, 29, 34, and recorded. result. Decision unit: Compare all relevant or matching search results under all sampling rates, determine the subcarrier width information of the searched area according to the maximum value, and obtain synchronization information.

It can be seen from the above device that although the terminal has to perform 6 searches, the same search unit can be reused for the received signals under the processing of 0.96 MHz and 0.48 MHz, and the hardware resources can be saved by half compared with the specific embodiment. The device complexity of the terminal. Moreover, the P-SCH design of the 7.5 kHz subcarrier follows the P-SCH 63 long sequence of the original 15 kHz subcarrier, which is advantageous for the UC/MC and DC dual mode base station reuse network side P-SCH signal generating apparatus. And the terminal reuses the synchronous search device under the 15 kHz subcarrier, which reduces the complexity of the base station transmitting end and the terminal receiving end device, and saves half of the bandwidth resources. Embodiment 3: In this embodiment, a method for transmitting and receiving a synchronization sequence is provided, which can indicate different area types under the same subcarrier width, such as a DC area or a UC/MC area.

On the network side:

591. The same subcarrier width but different types of regions are mapped to the time-frequency resources occupied by the primary synchronization channel P-SCH, and sent out;

592. The different types of regions use different secondary synchronization channels.

For example, the secondary synchronization channel is different, including one of the following cases or any combination thereof: using different secondary synchronization SSC sequences, or using different secondary synchronization scrambling codes, or using the secondary synchronization channel S-SCH to occupy different time-frequency resources. .

On the terminal side:

S101. The terminal distinguishes the type of the area according to the detected secondary synchronization channel by detecting the secondary synchronization channel.

The following is an example of a system with a DC region and a UC/MC region type with a 15 kHz subcarrier width as an example:

Network side: The main synchronization channel P-SCH of the Slll and DC areas reuses the P-SCH sequence of the primary synchronization channel of the UC/MC area. For example, the ZC sequence with a length of 63 is used, and the indicators of the base sequence are 25, 29, 34 respectively. One or more sequences;

S112, the DC area and the UC/MC use different secondary synchronization channels S-SCH, wherein the different secondary synchronization channels S-SCH include one of the following cases or any combination thereof: using different SSC sequences, using different scrambling codes , occupy different time-frequency resources, etc.

Terminal side: S121. The terminal can distinguish the UC/MC area and the DC area according to the detected secondary synchronization channel S-SCH by detecting the secondary synchronization channel S-SCH.

Through the above method, the area of the same subcarrier width can be transmitted through the synchronization sequence. The type information of the indication area, for example, a UC/MC area or a DC area; the terminal can know the type information of the foregoing area by receiving the synchronization sequence. In addition, the solution provided in the third embodiment may be combined with the foregoing specific embodiment, that is, the network side, for example, one or more base stations, and simultaneously perform the steps in the first embodiment and the first embodiment; the terminal simultaneously executes the implementation manner and implementation. The steps in mode one. In this preferred embodiment, the sub-carrier width information may be indicated by the primary synchronization channel P-SCH, and the type information of different regions under the same sub-carrier width may be indicated by the secondary synchronization channel S-SCH. In addition, the solution provided by this embodiment may be combined with the foregoing specific embodiment 2, that is, the network side, for example, one or more base stations, and the steps of the embodiment and the second embodiment are simultaneously performed; the terminal simultaneously executes the present embodiment and the second embodiment. The steps in . Such a preferred implementation may, on the one hand, be able to indicate the subcarrier width information of the region, and may also reduce the occupation of the 7.5 kHz subcarrier width system resource by the primary synchronization channel P-SCH, and enhance the compatibility of the communication system, and the other Aspects may indicate type information of different regions under the same subcarrier width through the secondary synchronization channel S-SCH.

Embodiment 4 In this embodiment, a method for transmitting and receiving a synchronization sequence is provided. For an area of the same subcarrier width but different types, an area type, such as a DC area or a UC/MC area, may be indicated. The following is an example of a system with a DC region and a UC/MC type with a 15 kHz subcarrier width as an example: Network side:

S131, the primary synchronization channel P-SCH of the DC region uses one or more primary synchronization channel P-SCH sequences different from the MC/UC region; terminal side: S141, the terminal can be distinguished by different primary synchronization channel P-SCH channels 15kHz UC/MC of subcarrier width and DC of 15 kHz subcarrier width. In a specific embodiment, the UC/MC area uses a sequence of 63 lengths, and the primary synchronization channel P-SCH of the DC area uses ZC sequences of other lengths, for example, a ZC sequence of length 61.

In a more specific embodiment, if only one primary synchronization channel P-SCH sequence is needed for the DC region, a ZC sequence with a length of 63 may be used for the primary synchronization channel P-SCH of the system where the DC region is located. The indicator is 38. In the present embodiment, since 38 and 25 pairs of lengths 63 are complementary, the generation unit and the search unit of the sequence with the index of 25 can be reused for the sequence of index 38, thus facilitating the base station to reuse the primary synchronization channel P on the network side. The -SCH signal generating means and the terminal reusing the search means on the terminal side reduce the complexity of the base station transmitting end and the terminal side side. In addition, the solution provided in this embodiment may be combined with the specific embodiment 1 or the specific embodiment 2, that is, the steps in the embodiment, the specific embodiment 1 or the second embodiment are simultaneously performed. Such a preferred embodiment may indicate subcarrier width information on the one hand and type information of the region on the other hand.

In a specific implementation manner, a method for indicating area type information is provided, which may indicate a type of a region, such as a DC region or a UC/MC region. On the network side: For different types of areas, use the same synchronization channel SCH and different broadcast channels (BCH, Broadcast Channel). The same synchronization channel SCH includes the same primary synchronization channel P-SCH and secondary synchronization channel S-SCH.

The following is an example of a system including a DC area and a UC/MC area type with a sub-carrier width of 15 kHz: On the network side: The DC area reuses the primary synchronization channel P-SCH sequence of the MC/UC area. Reuse means that the primary synchronization channel P-SCH of the DC region is the same sequence as the primary synchronization channel P-SCH sequence of the MC/UC region. For example, if the primary synchronization channel P-SCH sequence of the MC/UC area uses a ZC sequence of length 63, and the base sequence index is one or more sequences of 25, 29, 34, respectively, then the primary synchronization channel of the DC area The P-SCH also uses the above sequence; and the DC region and the MC/UC region use the same secondary synchronization channel S-SCH; and the DC region and the MC/UC region use different broadcast channels BCH; wherein, different BCH A channel is one or any combination of the following: different information content, using different coded modulation schemes, occupying different time-frequency resources, using different scrambling codes, and the like.

On the terminal side: The terminal can distinguish the UC/MC area of 15 kHz sub-carrier width and the DC area of 15 kHz sub-carrier width through different BCH channels. Through the above method, the type information of the area, such as a UC/MC area or a DC area, can be indicated by a different broadcast channel BCH; the terminal can learn the type information of the above area through different broadcast channels BCH.

In addition, the solution provided in this embodiment may be combined with the specific embodiment 1 or the specific implementation manner 2, that is, the steps in the real-time mode and the specific real-time mode 1 or the second embodiment are performed simultaneously, and the sub-carrier width may be indicated on the one hand. Information, on the other hand, can indicate the type information of the area.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention. It can be embodied in the form of a software product that can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for making a computer device (may It is a personal computer, a server, or a network device, etc.) that performs the methods described in various embodiments of the present invention.

Claims

Claim

A synchronization sequence transmission method, characterized in that

For systems with different subcarrier widths, the same frequency resource is transmitted but the length is different.

2. A method of transmitting a synchronization sequence according to claim 1, wherein:

For the systems with different sub-carrier widths, the steps of transmitting synchronization sequences occupying the same frequency resource but different lengths include:

For a subcarrier width of M 々 system, n1 ZC sequences of length L1, base sequence indicators u, u ₁₂ , , u _lnl are respectively generated, nl is a natural number, and nl ≤ 3, the nl sequences have a high Autocorrelation and low cross-correlation properties,

, the base sequence index u„, u ₁₂ , ... , u _{lnl is} near L1/2;

For systems with subcarrier widths Μ ₂ , Μ ₂ = Μ, χ 2, η2 lengths are generated as L2,

L2=LLl/2", the indices of the base sequence are the ZC sequences of U ₂₁ , U ₂₂ , and u _2n2 , respectively, n2 is a natural number, and n2 ≤ 3, the n2 sequences have high autocorrelation and low cross-correlation properties, And u ₂₂ = L2-u ₂₁ , the base sequence index u ₂₁ , u ₂₂ , , u _{2n2 is} near L2/2; and the ZC sequences of the aforementioned lengths LI, L2 have low cross-correlation properties;

For a subcarrier width of M 々 system, the n1 ZC sequences _whose length is L1 and _whose base sequence indices are u _n , u ₁₂ , ... , u _lnl are mapped to the primary synchronization channel P-SCH Sending the synchronization sequence on the occupied time-frequency resource;

For a system with a subcarrier width of M ₂ , the n2 lengths are L2, and the indices of the base sequence are u ₂₁ , u ₂₂ , . . . , and the ZC sequence of u _2n2 is mapped to the P-SCH. The synchronization sequence is sent on the occupied time-frequency resource.

3. A method of transmitting a synchronization sequence according to claim 2, characterized in that The nl lengths are LI, and the base sequence indicators are u„, u ₁₂ , . . . , and the ZC sequence of u _lnl is:

Three ZC sequences of length 127 base sequence indicators are 61, 65, 66 or 54, 56, 73 respectively; the n2 lengths are L2, and the base sequence indices are u ₂₁ , u ₂₂ , ... The ZC sequence of u _2n2 is: 3 ZC sequences of length 63 and base sequence index of 25, 29, 34;

The 7.5 kHz, the 15 kHz.

The method for transmitting a synchronization sequence according to claim 1, wherein the step of transmitting a synchronization sequence having the same length but occupying different frequency resources for the system with different subcarrier widths includes: generating n sequence lengths For L, the base sequence index is _Ul , u ₂ , , u 々ZC sequence, n is a natural number, n<3, the n sequences have high autocorrelation and low cross-correlation properties, and u^Lu^ and base sequence Indicator, u ₂ , , in! For the system of the sub-carrier width, the ZC sequence is mapped to the time-frequency resource occupied by the P-SCH of the sub-carrier width system, and sent out; for M ₂ , M ₂ = sub-carrier width The system maps the ZC sequence to a time-frequency resource occupied by a P-SCH of the 子₂ subcarrier width system, and sends the ZC sequence.

5. The method of transmitting a synchronization sequence according to claim 4, wherein said η sequences of length L, the base sequence indexes are _Ul, u _2, ......, u 々ZC sequence

Three ZC sequences having a sequence length of 63 and a base sequence index of 25, 29, and 34, respectively; the I^ subcarrier width is 7.5 kHz, the M ₂ , M ₂ = M , and the x2 subcarrier width is 15 kHz.

The method for transmitting a synchronization sequence according to any one of claims 1 to 5, wherein the method further comprises: for the same subcarrier width but different types of regions, the same primary synchronization sequence Map to primary sync The time-frequency resources occupied by the channel P-SCH are transmitted; the different types of regions use different secondary synchronization channels.

The method according to claim 6, wherein the same subcarrier width but different types of regions are: a DC region of 15 kHz subcarrier width, and a UC/MC region of 15 kHz subcarrier width;

The same primary synchronization sequence is a ZC sequence of length 63, and the indices of the base sequence are one or more sequences of 25, 29, 34, respectively.

The method according to claim 6, wherein the different secondary synchronization channels comprise one of the following cases or any combination thereof: using different secondary synchronization sequences, or using different secondary synchronizations Or the secondary synchronization channel S-SCH occupies different time-frequency resources.

The method for transmitting a synchronization sequence according to any one of claims 1 to 5, wherein the method further comprises: mapping different primary synchronization sequences to regions of the same subcarrier width but different types The time-frequency resource occupied by the primary synchronization channel P-SCH is transmitted.

The method according to claim 9, wherein the same subcarrier width but different types of regions are: a DC region of 15 kHz subcarrier width, and a UC/MC region of 15 kHz subcarrier width; The sequence is: The UC/MC region of the 15 kHz subcarrier width is a ZC sequence of 25, 29, 34 for the base sequence of length 63; the DC region for the 15 kHz subcarrier width is the other sequence.

11. The method according to claim 10, characterized in that, for a DC region of a 15 kHz subcarrier width, the other sequence is a ZC sequence of the index 38 of the base sequence of length 63.

The method of transmitting a synchronization sequence according to any one of claims 1 to 5, wherein the method further comprises:

The DC area and the MC/UC area use the same synchronization channel SCH and different broadcast channels BCH.

The method for transmitting a synchronization sequence according to claim 12, wherein the different BCH channels comprise one or any combination of the following: different information content, using different coding modulation schemes, occupying different Time-frequency resources, using different scrambling codes.

A synchronization sequence receiving method, wherein the terminal obtains a correlation or matching result of the received signal, where the correlation or matching result corresponds to a subcarrier bandwidth of the system, and corresponds to a synchronization sequence sent by the network side; The maximum value of the correlation or matching result is obtained, and the subcarrier bandwidth of the system and the synchronization sequence sent by the network side are obtained according to the subcarrier bandwidth corresponding to the maximum value and the synchronization sequence thereof.

The method for receiving a synchronization sequence according to claim 14, wherein the step of obtaining, by the terminal, the correlation or matching result of the received signal comprises: correlating or matching with the received signal using a local sequence to obtain correlation Or the matching result Y _M _ _{ui; Ilj} , l < nj < ni, i = l, 2 , ni < 3 , the correlation or matching result Υ _Μ corresponding system subcarrier bandwidth is Mi, the corresponding network side sends The index of the synchronization sequence is u „,. The local sequence is a sequence that is locally generated or stored on the terminal side and corresponds to a known network side primary synchronization channel P-SCH transmission sequence.

The synchronization sequence receiving method according to claim 15, wherein the local sequence is a ZC sequence having a length of 63, a base sequence index of 25, 29, and 34, and a length of 127 base sequence indicators respectively being 61. , 65, 66 ZC sequences;

The correlation or matching result obtained according to the local sequence respectively corresponds to: the subcarrier bandwidth of the system is 15 kHz and the base sequence index is 25, the subcarrier bandwidth of the system is 15 kHz, and the base sequence index is 29, and the subcarrier bandwidth of the system is 15 kHz and the base sequence index is 34; the subcarrier bandwidth of the system is 7.5 kHz and the base sequence index is 61, the subcarrier bandwidth of the system is 7.5 kHz and the base sequence index is 65, the subsystem of the system The carrier bandwidth is 7.5 kHz and the base sequence indicator is 66;

Alternatively, the local sequence is a ZC sequence having a length of 63, a base sequence index of 25, 29, 34, and a ZC sequence having a length of 127 base sequence indicators of 54, 56, 73;

The correlation or matching result obtained according to the local sequence respectively corresponds to: the subcarrier bandwidth of the system is 15 kHz and the base sequence index is 25, the subcarrier bandwidth of the system is 15 kHz, and the base sequence index is 29, and the subcarrier bandwidth of the system is 15 kHz and the base sequence index is 34; the subcarrier bandwidth of the system is 7.5 kHz and the base sequence index is 54, the subcarrier bandwidth of the system is 7.5 kHz and the base sequence index is 56, the subcarrier bandwidth of the system is 7.5 kHz and the base sequence indicator Is 73.

17. The synchronization sequence receiving method according to claim 14, wherein:

The step of obtaining, by the terminal, the correlation or matching result of the received signal includes: the terminal performs sampling for the received signal using two different sampling rates S ₂ , S ₂ = S , x 2 , and 8 , for the sub- The carrier width is the sampling rate corresponding to the bandwidth occupied by M † P-SCH, and 8 ₂ is the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is M ₂ ; using the local sequence and the different sampling rate The received signals are correlated or matched to obtain correlation or matching results Y _SiUn , i=l, 2, n= 1,2,3 , where Y _SiUn corresponds to the sampling rate S _; and the sequence index sent by the network side u _n . The local sequence is a sequence that is locally generated or stored on the terminal side and corresponds to a known network side P-SCH transmission sequence.

18. The synchronization sequence receiving method according to claim 17, wherein:

The sampling rate S ₂ is 0.48 MHz and 0.96 MHz, respectively, the ^ is 7.5 kHz subcarrier width, and the 1 ₂ is 15 kHz subcarrier width.

A synchronization sequence transmission system, comprising: a first sequence transmission subsystem, configured to send synchronization sequences occupying the same frequency resource but different lengths for different sub-carrier width systems; or, the second sequence Transmit subsystem, used to send long Synchronization sequences of the same degree but occupying different frequency resources.

20. The synchronization sequence transmitting system according to claim 19, wherein:

The first sequence sending subsystem includes: a first sequence generating unit: configured to generate nl lengths for a subcarrier width of M 々 system

L1, the base sequence index is a ZC sequence of u„, u ₁₂ , , u _lnl , nl is a natural number, and nl ≤ 3, the nl sequences have high autocorrelation and low cross-correlation properties, and

The base sequence index u„, u ₁₂ , , u _{lnl is} near U/2; the first sequence processing unit is used for the sub-carrier width M 々 system, the nl lengths are L1, and the base sequence indicators are respectively u „, u ₁₂ , ...... , u _lnl ZC sequence is mapped to the time-frequency resource occupied by the primary synchronization channel P-SCH, and the synchronization sequence is transmitted; second sequence generation unit: for subcarriers For systems with widths Μ ₂ , Μ ₂ = Μ, χ ₂ , η ₂ lengths are L2, L2 = L ^L1 / ² ”, and the indices of the base sequence are u ₂₁ , u ₂₂ , ... , u _2n2 of

ZC sequence, n2 is a natural number, and n2 ≤ 3, the n2 sequences have high autocorrelation and low cross-correlation properties,

JLu ₂₂ = L2-u ₂₁ , the base sequence index u ₂₁ , u ₂₂ , , u _{2n2 is} near L2/2; and the aforementioned length LI,

There is a low cross-correlation property between the ZC sequences of L2; a second sequence processing unit: for a system with a subcarrier width of M ₂ , M ₂ = MiX2, the n2 lengths are L2, L2=^1/2 The base sequence indicators are u ₂₁ , u ₂₂ , ... , u _2n2

The ZC sequence is mapped to the time-frequency resource occupied by the P-SCH, and the synchronization sequence is sent.

21. The synchronization sequence transmitting system according to claim 19, wherein:

The second sub-sequence is transmitted, comprising: a third sequence generating unit: means for generating n sequences of length L, the base sequence indexes are _Ul, u _2,, u 々ZC sequence, n is a natural number, n <3 , the n sequences have high autocorrelation and low cross-correlation properties, and

And the base sequence indicator uu ₂ , , in! ^ Nearby; a third sequence processing unit: configured to: for the system of the sub-carrier width, map the ZC sequence to a time-frequency resource occupied by the M ₁ sub-carrier width system P-SCH, and send the fourth sequence processing unit: For a system with M ₂ , M ₂ = subcarrier width, the ZC sequence is mapped to the time-frequency resource occupied by the P-SCH of the M ₂ subcarrier width system, and sent out.

A synchronization sequence receiving apparatus, comprising: the following unit: a receiving unit: configured to obtain a correlation or matching result of the received signal, where the correlation or matching result corresponds to a subcarrier bandwidth of the system, and the corresponding network side a synchronization sequence that is sent; a comparison unit: used to compare the size of the correlation or matching result to obtain a maximum value; and an obtaining unit: configured to obtain a subcarrier of the system according to the subcarrier bandwidth corresponding to the maximum value and the synchronization sequence thereof Bandwidth and the synchronization sequence sent by the network side.

23. A synchronization sequence receiving apparatus, comprising: the following unit: a sampling rate processing unit: configured to perform sampling on the received signal using two different sampling rates 8 ₁ and 8 ₂ , S ₂ = S, x2, and 8 are the sampling rate corresponding to the bandwidth occupied by the M † P-SCH, and S ₂ is the sampling rate corresponding to the bandwidth occupied by the P-SCH when the subcarrier width is M ₂ ;

Row correlation or matching, to obtain correlation or matching result Y _SA , i=l, 2, n=l, 2,3 , where Y _SA corresponds to sampling rate or S ₂ and sequence index u _n , the local sequence is at the terminal a locally generated or stored sequence corresponding to a known network side P-SCH transmission sequence; a decision unit: configured to compare all correlation or matching results at all sampling rates, and determine a sub-region of the searched region according to the maximum value Carrier width information, and get synchronization information.