CN112532556A - Method and device for sending synchronization signal - Google Patents

Method and device for sending synchronization signal Download PDF

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Publication number
CN112532556A
CN112532556A CN201910876025.0A CN201910876025A CN112532556A CN 112532556 A CN112532556 A CN 112532556A CN 201910876025 A CN201910876025 A CN 201910876025A CN 112532556 A CN112532556 A CN 112532556A
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subframe
sss
pss
ofdm symbols
ofdm symbol
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杨世云
龚秋莎
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation

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Abstract

The embodiment of the invention provides a method and a device for sending synchronous signals, wherein the synchronous signals comprise primary synchronous signals PSS and secondary synchronous signals SSS, a wireless frame comprises subframes 0-2, and the method comprises the following steps: all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS; and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2. The device performs the above method. According to the method and the device for sending the synchronous signals, SSS is sent by occupying all OFDM symbols of a subframe 0 and from 0 th OFDM symbol to 1 st OFDM symbol of the subframe 1; and then, the 2 nd OFDM symbol to the 8 th OFDM symbol of the subframe 1 and the 0 th OFDM symbol to the 3 rd OFDM symbol of the subframe 2 are occupied to send the PSS, so that the downlink transmission capability and the uplink transmission capability are balanced for the symmetrical service, and high-efficiency data transmission is realized.

Description

Method and device for sending synchronization signal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for sending a synchronization signal.
Background
The synchronization subband is dedicated to transmitting primary synchronization signals PSS and secondary synchronization signals SSS for cell search. The length of the PSS sequence and the length of the SSS sequence are both 62 points, and in the frequency domain, the PSS and the SSS occupy the bandwidth of 22kHz of a synchronization sub-band. Fig. 1 is a time domain diagram of PSS and SSS in the prior art, as shown in fig. 1, the uplink and downlink ratio is 1:3, i.e. subframe 1 is a special subframe, and the ratio of subframe 0 to subframe 2 to subframe 4 is 1: 3. In the time domain, the SSS is arranged in the front, occupying subframe 0 for a total of 462 sampling points. The PSS is placed after the SSS, occupying subframe 0 and downlink pilot time slot DwPTS, for a total of 463 sampling points. The transmission period of the PSS and SSS are both one radio frame.
The PSS and the SSS are generated by a Zadoff-Chu sequence, a PSS sequence with a length of 62 points is divided into 7 segments, each segment is respectively 4, 11, 3 subcarriers, and is respectively mapped onto 7 Orthogonal Frequency Division Multiplexing (OFDM) symbols, Frequency domain data (namely subcarriers) of the 7 OFDM symbols are respectively subjected to 64-point IFFT (namely inverse fourier transform), sequentially connected to form 448 sampling point time domain signals, and the last 15 sampling point signals are added before the 448 sampling point signals as cyclic prefixes to generate a time domain baseband signal of the PSS.
Dividing an SSS sequence with the length of 62 points into 7 segments, wherein the length of each segment is respectively 4, 11 and 3 subcarriers, and mapping the subcarriers to 7 OFDM symbols respectively; and respectively carrying out 64-point IFFT on the frequency domain data of the 7 OFDM symbols, sequentially connecting to form 448 sampling point time domain signals, adding the last 14 sampling point signals before the 448 sampling point signals as cyclic prefixes, and generating a time domain baseband signal of the SSS.
For symmetric services, such as a distribution network service and a voice service, the above-mentioned sending method of the synchronization signal results in imbalance between downlink transmission capability and uplink transmission capability, and high-efficiency data transmission cannot be realized.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for sending a synchronization signal.
The embodiment of the invention provides a method for sending a synchronous signal, wherein the synchronous signal comprises a primary synchronous signal PSS and a secondary synchronous signal SSS, a wireless frame comprises subframes 0-2, and the method for sending the synchronous signal comprises the following steps:
all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS;
and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
Before the step of transmitting the SSS by using all OFDM symbols of subframe 0 and 0 th to 1 st OFDM symbols of subframe 1, the synchronization signal transmission method further includes:
dividing an SSS sequence into six segments, and determining resource elements corresponding to the SSS sequence according to the number of the segments, the number of subcarriers of each segment and a first mapping relation; the resource elements comprise OFDM symbols and subcarriers corresponding to the OFDM symbols;
acquiring sampling point time domain signals corresponding to the SSS sequence according to subcarriers corresponding to all OFDM symbols;
sequentially connecting sampling point time domain signals corresponding to at least two SSS sequences to obtain all sampling point time domain signals corresponding to a total SSS sequence;
adding sampling point signals which can be used as cyclic prefixes before all sampling point time domain signals to generate time domain baseband signals of the SSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2.
The number of subcarriers of each segment of the SSS sequence is respectively 9, 11 and 9; correspondingly, the determining resource elements corresponding to the SSS sequence according to the number of segments of a segment, the number of subcarriers of each segment, and the first mapping relationship includes:
determining resource elements corresponding to the SSS sequence according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝0
αk,l＝d(9+11(l-1)+k),k＝0,...,10,l＝1,...,4
αk,l＝d(9+11(l-1)+k),k＝0,...,8,l＝5
wherein alpha isk,lIs a resource element corresponding to the SSS sequence, l is an OFDM symbol corresponding to the SSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the SSS sequence.
The determination of the sampling point signal which can be used as the cyclic prefix comprises the following steps:
determining the difference between the predetermined total number of sampling points corresponding to the SSS sequence and the predetermined total number of sampling points corresponding to the SSS sequence as the number of the sampling point signals which can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total SSS sequence.
Before the step of transmitting the PSS using the 2 nd to 8 th OFDM symbols of the subframe 1 and the 0 th to 3 rd OFDM symbols of the subframe 2, the method for transmitting the synchronization signal further includes:
dividing the PSS sequence into six segments, and determining resource elements corresponding to the PSS sequence according to the number of segmented segments, the number of subcarriers of each segmented segment and a second mapping relation; the resource elements comprise OFDM symbols and subcarriers corresponding to the OFDM symbols;
acquiring a sampling point time domain signal corresponding to the PSS sequence according to subcarriers corresponding to all OFDM symbols;
sequentially connecting sampling point time domain signals corresponding to at least two PSS sequences to obtain all sampling point time domain signals corresponding to the total PSS sequence;
adding sampling point signals which can be used as cyclic prefixes before all sampling point time domain signals to generate time domain baseband signals of the PSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2.
Wherein, the number of sub-carriers of each segment of the PSS sequence is respectively 9, 11 and 9; correspondingly, the determining the resource elements corresponding to the PSS sequence according to the number of segments of the segment, the number of subcarriers of each segment, and the second mapping relationship includes:
determining resource elements corresponding to the PSS sequence according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝11
αk,l＝d(9+11(l-12)+k),k＝0,...,10,l＝12,...,15
αk,l＝d(9+11(l-12)+k),k＝0,...,8,l＝16
wherein alpha isk,lIs and aThe resource elements corresponding to the PSS sequence, l is an OFDM symbol corresponding to the PSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the PSS sequence.
The determination of the sampling point signal which can be used as the cyclic prefix comprises the following steps:
determining the difference between the predetermined total number of sampling points corresponding to the PSS sequence and the predetermined total number of sampling points corresponding to the PSS sequence as the number of the sampling point signals which can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total PSS sequence.
The embodiment of the invention provides a synchronous signal sending device, wherein the synchronous signal comprises a primary synchronous signal PSS and a secondary synchronous signal SSS, a wireless frame comprises subframes 0-2, and the synchronous signal sending device comprises:
a first sending unit, configured to occupy all OFDM symbols of subframe 0 and send the SSS from a 0 th OFDM symbol to a 1 st OFDM symbol of subframe 1;
and the second sending unit is used for sending the PSS by occupying the 2 nd OFDM symbol to the 8 th OFDM symbol of the subframe 1 and the 0 th OFDM symbol to the 3 rd OFDM symbol of the subframe 2.
An embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein,
the processor, when executing the computer program, implements the method steps of:
all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS;
and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
An embodiment of the invention provides a non-transitory computer readable storage medium having a computer program stored thereon, which when executed by a processor implements the following method steps:
all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS;
and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
According to the method and the device for sending the synchronous signals, SSS is sent by occupying all OFDM symbols of a subframe 0 and from 0 th OFDM symbol to 1 st OFDM symbol of the subframe 1; and then, the 2 nd OFDM symbol to the 8 th OFDM symbol of the subframe 1 and the 0 th OFDM symbol to the 3 rd OFDM symbol of the subframe 2 are occupied to send the PSS, so that the downlink transmission capability and the uplink transmission capability are balanced for the symmetrical service, and high-efficiency data transmission is realized.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Figure 1 is a time domain diagram of a prior art PSS and SSS;
FIG. 2 is a flowchart of an embodiment of a method for sending a synchronization signal according to the present invention;
FIG. 3 is a time domain diagram of the PSS and SSS in accordance with the present invention;
FIG. 4 is a schematic structural diagram of a synchronization signal transmitting apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a flowchart of an embodiment of a method for sending a synchronization signal according to the present invention, and as shown in fig. 2, the synchronization signal sending method provided in the embodiment of the present invention includes a primary synchronization signal PSS and a secondary synchronization signal SSS, and a radio frame includes subframes 0 to 2, and the method for sending a synchronization signal includes the following steps:
s201: and all OFDM symbols occupying the subframe 0 and the 0 th to 1 st OFDM symbols of the subframe 1 are used for transmitting the SSS.
Specifically, the SSS is sent by occupying all OFDM symbols of subframe 0, and 0 th to 1 st OFDM symbols of subframe 1. The method steps may be executed by a computer device, and the like, and the embodiment of the present invention may be selected as a base station, but is not limited in particular. Fig. 3 is a time domain diagram of the PSS and the SSS according to the embodiment of the present invention, and as shown in fig. 3, the SSS is sent first, and occupies the 0 th to 8 th OFDM symbols of the subframe 0 and occupies the 0 th to 1 st OFDM symbols of the subframe 1.
S202: and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
Specifically, the PSS is transmitted by occupying the 2 nd to 8 th OFDM symbols of the subframe 1 and the 0 th to 3 rd OFDM symbols of the subframe 2. As shown in fig. 3, the PSS is transmitted again, and the PSS is transmitted occupying the 2 nd to 8 th OFDM symbols of the subframe 1, and the 0 th to 3 rd OFDM symbols of the subframe 2. Compared with the prior art corresponding to fig. 1, the uplink and downlink proportion of the embodiment of the invention is 2:2, namely subframe 2 is a special subframe, and the ratio of subframe 0-subframe 1 and subframe 3-subframe 4 is 2:2, the method is adopted to send the synchronous signal, thereby not only fully utilizing downlink resources, but also improving demodulation performance so as to meet the requirement of transmission efficiency of the symmetric service of industrial users.
According to the method for sending the synchronous signals, the SSS is sent by preempting all OFDM symbols of the subframe 0 and the 0 th OFDM symbol to the 1 st OFDM symbol of the subframe 1; and then, the 2 nd OFDM symbol to the 8 th OFDM symbol of the subframe 1 and the 0 th OFDM symbol to the 3 rd OFDM symbol of the subframe 2 are occupied to send the PSS, so that the downlink transmission capability and the uplink transmission capability are balanced for the symmetrical service, and high-efficiency data transmission is realized.
On the basis of the above embodiment, before the step of transmitting the SSS by using all OFDM symbols of subframe 0 and 0 th to 1 st OFDM symbols of subframe 1, the synchronization signal transmission method further includes:
dividing an SSS sequence into six segments, and determining resource elements corresponding to the SSS sequence according to the number of the segments, the number of subcarriers of each segment and a first mapping relation; wherein the resource elements include OFDM symbols and subcarriers corresponding thereto.
Specifically, the SSS sequence is divided into six segments, and resource elements corresponding to the SSS sequence are determined according to the number of segments of a segment, the number of subcarriers of each segment, and a first mapping relationship; wherein the resource elements include OFDM symbols and subcarriers corresponding thereto. Further, the number of subcarriers of each segment of the SSS sequence is 9, 11, and 9; correspondingly, the determining resource elements corresponding to the SSS sequence according to the number of segments of a segment, the number of subcarriers of each segment, and the first mapping relationship includes:
determining resource elements corresponding to the SSS sequence according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝0
αk,l＝d(9+11(l-1)+k),k＝0,...,10,l＝1,...,4
αk,l＝d(9+11(l-1)+k),k＝0,...,8,l＝5
wherein alpha isk,lIs a resource element corresponding to the SSS sequence, l is an OFDM symbol corresponding to the SSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the SSS sequence. Referring to fig. 3, l is 0 to 5, corresponding to the first 6 OFDM symbols occupied by the SSS, k is 0 to 8, and l is 0, corresponding to 9 subcarriers in the 1 st OFDM symbol in the first 6 OFDM symbols occupied by the SSS, and the subcarriers of other OFDM symbols are not described again.
The PSS sequence length and the SSS sequence length are both 62 points, and in the time domain, the SSS is arranged in the front, and occupies subframe 0 and subframe 1, and a total of 782 sampling points. PSS is placed after SSS, occupying DwPTS in subframe 1 and subframe 2 for a total of 783 sampling points.
Taking the sector ID as 0/1/2, and generating an SSS sequence of 62 points in length, which is noted as:
{SSC(0),...,SSC(2n),SSC(2n+1),...,SSC(61)}
the code is formed by interleaving and concatenating two binary sequences with the length of 31, and the following formula is formed:
Figure BDA0002204383370000071
Figure BDA0002204383370000072
wherein n is more than or equal to 0 and less than or equal to 30, m0And m1To index the parameters, it can be determined by the following formula:
Figure BDA0002204383370000073
Figure BDA0002204383370000074
wherein mod represents the remainder, group ID identification
Figure BDA0002204383370000075
And m0And m1The corresponding relationship is shown in table 1:
TABLE 1
Figure BDA0002204383370000081
Figure BDA0002204383370000091
Sequence of
Figure BDA0002204383370000092
And sequence
Figure BDA0002204383370000093
According to m0And m1Taking values and aligning m-sequences
Figure BDA0002204383370000094
The cyclic shift results as the following equation:
Figure BDA0002204383370000095
Figure BDA0002204383370000096
wherein the content of the first and second substances,
Figure BDA0002204383370000097
scrambling sequence c0(n) and scrambling sequence c1(n) according to sector ID and m-pair sequence
Figure BDA0002204383370000098
The cyclic shift results as the following equation:
Figure BDA0002204383370000099
Figure BDA00022043833700000910
wherein the content of the first and second substances,
Figure BDA00022043833700000911
sector ID identification
Figure BDA00022043833700000912
Can be 0, 1 or 2.
Scrambling sequences
Figure BDA00022043833700000913
According to m0And m1Taking values and aligning m-sequences
Figure BDA00022043833700000914
The cyclic shift results as the following equation:
Figure BDA00022043833700000915
wherein the content of the first and second substances,
Figure BDA00022043833700000916
and acquiring a sampling point time domain signal corresponding to the SSS sequence according to the subcarriers corresponding to all the OFDM symbols.
Specifically, sampling point time domain signals corresponding to the SSS sequence are obtained according to subcarriers corresponding to all OFDM symbols.
And respectively performing 64-point IFFT (inverse Fourier transform) on the frequency domain data (namely the subcarriers) corresponding to the 6 OFDM symbols, and sequentially connecting to form 384 sampling point time domain signals.
And sequentially connecting the sampling point time domain signals corresponding to the at least two SSS sequences to obtain all sampling point time domain signals corresponding to the total SSS sequence.
Specifically, sampling point time domain signals corresponding to at least two SSS sequences are sequentially connected to obtain all sampling point time domain signals corresponding to a total SSS sequence. That is, two groups of identical 384 sampling point time domain signals can be sequentially connected to obtain 768 sampling point time domain signals corresponding to the total SSS sequence.
Adding sampling point signals which can be used as cyclic prefixes before all sampling point time domain signals to generate time domain baseband signals of the SSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2.
Specifically, sampling point signals which can be used as cyclic prefixes are added before all sampling point time domain signals to generate time domain baseband signals of the SSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2. Further, the difference between the predetermined total number of sampling points corresponding to the SSS sequence and the predetermined total number of sampling points corresponding to the SSS sequence may be determined as the number of sampling point signals that can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total SSS sequence. Referring to the above description, the predetermined total number of sampling points corresponding to the SSS sequence is 782, and the predetermined total number of sampling points corresponding to the SSS sequence is 768, so that the number of sampling point signals that can be used as cyclic prefixes is 14, and the 14 sampling point signals are added as cyclic prefixes before the 768 sampling point signals, so as to generate the time domain baseband signal of the SSS.
According to the method for sending the synchronous signals, provided by the embodiment of the invention, the resource elements corresponding to the SSS sequences are determined through the first mapping relation, and the time domain signals of the sampling points corresponding to the at least two SSS sequences are sequentially connected, so that the time domain baseband signals of the SSS can be generated, and high-efficiency data transmission is realized.
On the basis of the above embodiment, the number of subcarriers of each segment of the SSS sequence is 9, 11, and 9; correspondingly, the determining resource elements corresponding to the SSS sequence according to the number of segments of a segment, the number of subcarriers of each segment, and the first mapping relationship includes:
specifically, the resource elements corresponding to the SSS sequence are determined according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝0
αk,l＝d(9+11(l-1)+k),k＝0,...,10,l＝1,...,4
αk,l＝d(9+11(l-1)+k),k＝0,...,8,l＝5
wherein alpha isk,lIs a resource element corresponding to the SSS sequence, l is an OFDM symbol corresponding to the SSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the SSS sequence. Reference is made to the above description and no further description is made.
According to the method for sending the synchronous signals, the resource elements corresponding to the SSS sequence are determined through a specific formula, so that time domain baseband signals of the SSS are generated, and high-efficiency data transmission is guaranteed.
On the basis of the above embodiment, the determining of the sampling point signal that can be used as the cyclic prefix includes:
specifically, the difference between the predetermined total number of sampling points corresponding to the SSS sequence and the predetermined total number of sampling points corresponding to the SSS sequence is determined as the number of sampling point signals that can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total SSS sequence. Reference is made to the above description and no further description is made.
The synchronous signal sending method provided by the embodiment of the invention further optimizes data transmission by determining the sampling point signal of the cyclic prefix.
On the basis of the above embodiment, before the step of transmitting the PSS using the 2 nd to 8 th OFDM symbols of the subframe 1 and the 0 th to 3 rd OFDM symbols of the subframe 2, the synchronization signal transmission method further includes:
dividing the PSS sequence into six segments, and determining resource elements corresponding to the PSS sequence according to the number of segmented segments, the number of subcarriers of each segmented segment and a second mapping relation; wherein the resource elements include OFDM symbols and subcarriers corresponding thereto.
Specifically, the PSS sequence is divided into six segments, and resource elements corresponding to the PSS sequence are determined according to the number of the segmented segments, the number of subcarriers of each segmented segment and a second mapping relation; wherein the resource elements include OFDM symbols and subcarriers corresponding thereto. The number of sub-carriers of each segment of the PSS sequence is respectively 9, 11 and 9; correspondingly, the determining the resource elements corresponding to the PSS sequence according to the number of segments of the segment, the number of subcarriers of each segment, and the second mapping relationship includes:
determining resource elements corresponding to the PSS sequence according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝11
αk,l＝d(9+11(l-12)+k),k＝0,...,10,l＝12,...,15
αk,l＝d(9+11(l-12)+k),k＝0,...,8,l＝16
wherein alpha isk,lIs a resource element corresponding to the PSS sequence, l is an OFDM symbol corresponding to the PSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the PSS sequence. Referring to fig. 3, l is 11 to 16, corresponding to the first 6 OFDM symbols occupied by the PSS, k is 0 to 8, and l is 11, corresponding to 9 subcarriers in the 1 st OFDM symbol in the first 6 OFDM symbols occupied by the PSS, which is not repeated.
PSS can be generated from Zadoff-Chu sequences, see the following equation:
Figure BDA0002204383370000121
wherein d isu(n) denotes the PSS sequence, and the value of u can be determined according to Table 2
Figure BDA0002204383370000122
To be determined.
TABLE 2
Figure BDA0002204383370000123
The 62-point-long PSS sequence is generated by using table 2 with sector ID of 0/1/2, and three 62-point-long PSS sequences can be divided into 6 segments, each segment is 9, 11, and 9 subcarriers, and each segment is mapped to 6 OFDM symbols.
And acquiring a sampling point time domain signal corresponding to the PSS sequence according to the subcarriers corresponding to all the OFDM symbols.
Specifically, according to the subcarriers corresponding to all the OFDM symbols, sampling point time domain signals corresponding to the PSS sequence are obtained. The subcarriers (i.e. frequency domain data) corresponding to the 6 OFDM symbols are respectively subjected to 64-point IFFT (i.e. inverse fourier transform), and are sequentially connected to form a 384-sampling-point time domain signal.
And sequentially connecting the sampling point time domain signals corresponding to the at least two PSS sequences to obtain all sampling point time domain signals corresponding to the total PSS sequence.
Specifically, sampling point time domain signals corresponding to at least two PSS sequences are sequentially connected to obtain all sampling point time domain signals corresponding to the total PSS sequence. That is, two groups of identical 384 sampling point time domain signals can be sequentially connected to obtain 768 sampling point time domain signals corresponding to the total PSS sequence.
Adding sampling point signals which can be used as cyclic prefixes before all sampling point time domain signals to generate time domain baseband signals of the PSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2.
Specifically, sampling point signals which can be used as cyclic prefixes are added before all sampling point time domain signals to generate time domain baseband signals of the PSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2. Further, the difference between the predetermined total number of sampling points corresponding to the PSS sequence and the predetermined total number of sampling points corresponding to the PSS sequence may be determined as the number of sampling point signals that can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total PSS sequence. Referring to the above description, the predetermined total number of sampling points corresponding to the PSS sequence is 783, and the predetermined total number of sampling points corresponding to the PSS sequence is 768, so that the number of sampling point signals that can be used as cyclic prefixes is 15, and the 15 sampling point signals are added as cyclic prefixes before the 768 sampling point signals, thereby generating the time-domain baseband signal of the PSS.
According to the method for sending the synchronization signal, provided by the embodiment of the invention, the resource elements corresponding to the PSS sequence are determined through the second mapping relation, and the time domain signals of the sampling points corresponding to at least two PSS sequences are sequentially connected, so that the time domain baseband signals of the PSS can be generated, and high-efficiency data transmission is realized.
On the basis of the above embodiment, the number of subcarriers of each segment of the PSS sequence is 9, 11, and 9; correspondingly, the determining the resource elements corresponding to the PSS sequence according to the number of segments of the segment, the number of subcarriers of each segment, and the second mapping relationship includes:
specifically, the resource elements corresponding to the PSS sequence are determined according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝11
αk,l＝d(9+11(l-12)+k),k＝0,...,10,l＝12,...,15
αk,l＝d(9+11(l-12)+k),k＝0,...,8,l＝16
wherein alpha isk,lIs a resource element corresponding to the PSS sequence, l is an OFDM symbol corresponding to the PSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the PSS sequence. Reference is made to the above description and no further description is made.
According to the method for sending the synchronization signal, the resource elements corresponding to the PSS sequence are determined through a specific formula, so that the time domain baseband signal of the PSS is generated, and high-efficiency data transmission is guaranteed.
On the basis of the above embodiment, the determining of the sampling point signal that can be used as the cyclic prefix includes:
specifically, the difference between the predetermined total number of sampling points corresponding to the PSS sequence and the predetermined total number of sampling points corresponding to the PSS sequence is determined as the number of the sampling point signals that can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total PSS sequence. Reference is made to the above description and no further description is made.
The synchronous signal sending method provided by the embodiment of the invention further optimizes data transmission by determining the sampling point signal of the cyclic prefix.
Fig. 4 is a schematic structural diagram of an embodiment of a synchronization signal transmitting apparatus according to the present invention, and as shown in fig. 4, the embodiment of the present invention provides a synchronization signal transmitting apparatus, where a synchronization signal includes a primary synchronization signal PSS and a secondary synchronization signal SSS, a radio frame includes subframes 0 to 2, the synchronization signal transmitting apparatus includes a first transmitting unit 401 and a second transmitting unit 402, where:
the first sending unit 401 is configured to occupy all OFDM symbols of subframe 0 and send the SSS from the 0 th OFDM symbol to the 1 st OFDM symbol of subframe 1; the second transmitting unit 402 is configured to transmit the PSS by occupying the 2 nd to 8 th OFDM symbols of the subframe 1 and the 0 th to 3 rd OFDM symbols of the subframe 2.
Specifically, the first sending unit 401 is configured to occupy all OFDM symbols of the subframe 0 and send the SSS through 0 th OFDM symbols to 1 st OFDM symbols of the subframe 1; the second transmitting unit 402 is configured to transmit the PSS by occupying the 2 nd to 8 th OFDM symbols of the subframe 1 and the 0 th to 3 rd OFDM symbols of the subframe 2.
The synchronization signal transmitting device provided by the embodiment of the invention transmits SSS by preempting all OFDM symbols of a subframe 0 and from the 0 th OFDM symbol to the 1 st OFDM symbol of the subframe 1; and then, the 2 nd OFDM symbol to the 8 th OFDM symbol of the subframe 1 and the 0 th OFDM symbol to the 3 rd OFDM symbol of the subframe 2 are occupied to send the PSS, so that the downlink transmission capability and the uplink transmission capability are balanced for the symmetrical service, and high-efficiency data transmission is realized.
The synchronization signal sending apparatus provided in the embodiment of the present invention may be specifically configured to execute the processing flows of the above method embodiments, and the functions of the synchronization signal sending apparatus are not described herein again, and refer to the detailed description of the above method embodiments.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 5, the electronic device includes: a processor (processor)501, a memory (memory)502, and a bus 503;
the processor 501 and the memory 502 complete communication with each other through a bus 503;
the processor 501 is configured to call program instructions in the memory 502 to perform the methods provided by the above-mentioned method embodiments, for example, including: all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS; and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising: all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS; and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS; and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for sending synchronous signals comprises a primary synchronous signal PSS and a secondary synchronous signal SSS, and a wireless frame comprises sub-frames 0-2, and is characterized in that the method comprises the following steps:
all OFDM symbols of a subframe 0 and the 0 th to 1 st OFDM symbols of a subframe 1 are occupied to send the SSS;
and transmitting the PSS by occupying 2 nd to 8 th OFDM symbols of the subframe 1 and 0 th to 3 rd OFDM symbols of the subframe 2.
2. The method according to claim 1, wherein before the step of transmitting the SSS using all OFDM symbols of subframe 0, 0 th to 1 st OFDM symbols of subframe 1, the method further comprises:
dividing an SSS sequence into six segments, and determining resource elements corresponding to the SSS sequence according to the number of the segments, the number of subcarriers of each segment and a first mapping relation; the resource elements comprise OFDM symbols and subcarriers corresponding to the OFDM symbols;
acquiring sampling point time domain signals corresponding to the SSS sequence according to subcarriers corresponding to all OFDM symbols;
sequentially connecting sampling point time domain signals corresponding to at least two SSS sequences to obtain all sampling point time domain signals corresponding to a total SSS sequence;
adding sampling point signals which can be used as cyclic prefixes before all sampling point time domain signals to generate time domain baseband signals of the SSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2.
3. The method according to claim 2, wherein the number of subcarriers of each segment of the SSS sequence is 9, 11, and 9; correspondingly, the determining resource elements corresponding to the SSS sequence according to the number of segments of a segment, the number of subcarriers of each segment, and the first mapping relationship includes:
determining resource elements corresponding to the SSS sequence according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝0
αk,l＝d(9+11(l-1)+k),k＝0,...,10,l＝1,...,4
αk,l＝d(9+11(l-1)+k),k＝0,...,8,l＝5
wherein alpha isk,lTo the SSS sequenceThe resource elements corresponding to the columns, l are OFDM symbols corresponding to the SSS sequence, and k is subcarriers corresponding to the OFDM symbols corresponding to the SSS sequence.
4. The method according to claim 3, wherein the determining of the sampling point signal that can be used as the cyclic prefix comprises:
determining the difference between the predetermined total number of sampling points corresponding to the SSS sequence and the predetermined total number of sampling points corresponding to the SSS sequence as the number of the sampling point signals which can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total SSS sequence.
5. The method of any of claims 1 to 4, wherein before the step of transmitting the PSS according to the 2 nd to 8 th OFDM symbols of the occupied sub-frame 1 and the 0 th to 3 rd OFDM symbols of the sub-frame 2, the method further comprises:
dividing the PSS sequence into six segments, and determining resource elements corresponding to the PSS sequence according to the number of segmented segments, the number of subcarriers of each segmented segment and a second mapping relation; the resource elements comprise OFDM symbols and subcarriers corresponding to the OFDM symbols;
acquiring a sampling point time domain signal corresponding to the PSS sequence according to subcarriers corresponding to all OFDM symbols;
sequentially connecting sampling point time domain signals corresponding to at least two PSS sequences to obtain all sampling point time domain signals corresponding to the total PSS sequence;
adding sampling point signals which can be used as cyclic prefixes before all sampling point time domain signals to generate time domain baseband signals of the PSS; the time domain baseband signals are 2 nd OFDM symbol to 8 th OFDM symbol of the subframe 1, and 0 th OFDM symbol to 3 rd OFDM symbol of the subframe 2.
6. The method of claim 5, wherein the number of subcarriers of each segment of the PSS sequence is 9, 11, and 9; correspondingly, the determining the resource elements corresponding to the PSS sequence according to the number of segments of the segment, the number of subcarriers of each segment, and the second mapping relationship includes:
determining resource elements corresponding to the PSS sequence according to the following formula:
αk,l＝d(k),k＝0,...,8,l＝11
αk,l＝d(9+11(l-12)+k),k＝0,...,10,l＝12,...,15
αk,l＝d(9+11(l-12)+k),k＝0,...,8,l＝16
wherein alpha isk,lIs a resource element corresponding to the PSS sequence, l is an OFDM symbol corresponding to the PSS sequence, and k is a subcarrier corresponding to the OFDM symbol corresponding to the PSS sequence.
7. The method according to claim 6, wherein the determining of the sampling point signal that can be used as the cyclic prefix comprises:
determining the difference between the predetermined total number of sampling points corresponding to the PSS sequence and the predetermined total number of sampling points corresponding to the PSS sequence as the number of the sampling point signals which can be used as the cyclic prefix; and the number of the sampling points corresponds to the number of all sampling point time domain signals corresponding to the total PSS sequence.
8. A synchronization signal transmitting apparatus, the synchronization signal including a primary synchronization signal PSS and a secondary synchronization signal SSS, and a radio frame including subframes 0 to 2, the synchronization signal transmitting apparatus comprising:
a first sending unit, configured to occupy all OFDM symbols of subframe 0 and send the SSS from a 0 th OFDM symbol to a 1 st OFDM symbol of subframe 1;
and the second sending unit is used for sending the PSS by occupying the 2 nd OFDM symbol to the 8 th OFDM symbol of the subframe 1 and the 0 th OFDM symbol to the 3 rd OFDM symbol of the subframe 2.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 7 are implemented when the computer program is executed by the processor.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
CN201910876025.0A 2019-09-17 2019-09-17 Method and device for sending synchronization signal Withdrawn CN112532556A (en)

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CN108738123A (en) * 2017-04-14 2018-11-02 普天信息技术有限公司 A kind of method for transmitting synchronizing signal and device
CN109151986A (en) * 2017-06-19 2019-01-04 北京信威通信技术股份有限公司 TDD-LTE synchronous method, device, system, equipment and storage medium
CN109479287A (en) * 2017-01-25 2019-03-15 华为技术有限公司 A kind of information transferring method and device

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CN105307260A (en) * 2014-07-24 2016-02-03 普天信息技术有限公司 Method for sending synchronous signal sequence
CN108243136A (en) * 2016-12-27 2018-07-03 普天信息技术有限公司 A kind of radio frame synchronization sub-band frames infrastructure resource distribution method
CN109479287A (en) * 2017-01-25 2019-03-15 华为技术有限公司 A kind of information transferring method and device
CN108738123A (en) * 2017-04-14 2018-11-02 普天信息技术有限公司 A kind of method for transmitting synchronizing signal and device
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