CN110601808B - Downlink synchronization signal issuing method and device, base station and readable storage medium - Google Patents
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Abstract
Method for sending down synchronous signalThe base station sets the offset value of the zero-number physical resource block PRB0 in SSB and the zero-number general resource block CRBO in transmission bandwidth to be zero or (N-M) · 2μBecause the SSB is set to zero, the SSB is configured at the low-frequency end of the transmission bandwidth and is set to (N-M) · 2μIn the case of (2), since the SSB is arranged at the high-frequency end of the transmission bandwidth, it is possible to avoid the SSB being arranged in the middle band region of the transmission bandwidth, and therefore, it is possible to avoid dividing the transmission bandwidth into a plurality of stages, and it is possible to reduce the PAPR.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for issuing a downlink synchronization signal, a base station, and a readable storage medium.
Background
Synchronization is an essential step of a wireless communication system and can be divided into downlink synchronization and uplink synchronization. After a User Equipment (UE) is turned on, a broadcast signal and a synchronization signal sent by a base station are first blindly detected to obtain information such as time (system frame, subframe) and frequency point of the base station, cell PCI, and the like. The UE can perform uplink synchronization only after completing downlink synchronization, and can transmit service data between the UE and the base station only after completing downlink synchronization and uplink synchronization.
In a satellite communication System, the first step of UE power-on is also downlink synchronization, i.e. searching for a System information block (SSB). The position of the SSB of the satellite communication system in the frequency domain is determined by the network side, i.e. the base station, and the UE performs blind detection according to the step size of the synchronization grid raster.
In the prior art, the SSB can be configured at any position on the transmission bandwidth.
Disclosure of Invention
In the course of research, the applicant found that, since the forward link and the reverse link of the satellite communication system uniformly use Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) waveforms, if the SSB is not placed at one end of the transmission bandwidth, the transmission bandwidth will be segmented, and the DFT-S-OFDM waveform has the characteristic of higher Peak-to-Average Power Ratio (PAPR) with the larger number of segments. If the PAPR is high, the power amplifier efficiency at the transmitting end is reduced, and since the satellite link is nonlinear, the higher the PAPR, the higher the nonlinearity is, which leads to increased nonlinearity, and adverse effects such as third-order intermodulation, EVM index degradation, and SINR degradation are generated.
The application provides a downlink synchronization signal issuing method, a device base station and a readable storage medium, and aims to solve the problem of reducing PAPR (peak-to-average power ratio) by configuring SSBs at two ends of a transmission bandwidth.
In order to achieve the above object, the present application provides the following technical solutions:
a downlink synchronization signal issuing method comprises the following steps:
the base station sets the value of the first offset to 0 or (N-M) · 2μThe first offset is the offset of a physical resource block PRB0 zero in an SSB and a common resource block CRBO zero in a transmission bandwidth, wherein N is the number of resource blocks in the transmission bandwidth, M is the number of physical resource blocks PRB in the SSB, and mu is determined according to the interval of subcarriers in the transmission bandwidth;
and the base station issues a downlink synchronous signal, wherein the downlink synchronous signal comprises the value of the first offset.
Optionally, the correspondence between μ and the interval of the subcarrier includes:
in the case that the interval of the subcarriers is 15KHZ, the mu is 0;
in the case that the interval of the subcarriers is 30KHZ, the mu is 1;
in the case that the interval of the subcarriers is 60KHZ, the mu is 2;
in the case that the interval of the subcarriers is 120KHZ, the mu is 3;
in the case where the interval of the subcarriers is 240KHZ, the μ is 4.
Optionally, the downlink synchronization signal further includes: a value of a second offset, which is an offset of a zero-number subcarrier in the PRB0 and a zero-number subcarrier in a target CRB, wherein the target CRB is a CRB overlapping with the PRB 0;
before the base station issues the downlink synchronization signal, the method further includes:
if the interval of the sub-carriers is larger than or equal to 120KHZ, the base station enables the highest bit in the second offset to be
Is set to 0.
Optionally, M is 20.
A downlink synchronization signal issuing device comprises:
a setting module for setting the value of the first offset to 0 or (N-M). 2μThe first offset is the offset of a physical resource block PRB0 zero in an SSB and a common resource block CRBO zero in a transmission bandwidth, wherein N is the number of resource blocks in the transmission bandwidth, M is the number of physical resource blocks PRB in the SSB, and mu is determined according to the interval of subcarriers in the transmission bandwidth;
and the sending module is used for sending a downlink synchronous signal, and the downlink synchronous signal comprises the value of the first offset.
Optionally, the correspondence between μ and the interval of the subcarrier includes:
in the case that the interval of the subcarriers is 15KHZ, the mu is 0;
in the case that the interval of the subcarriers is 30KHZ, the mu is 1;
in the case that the interval of the subcarriers is 60KHZ, the mu is 2;
in the case that the interval of the subcarriers is 120KHZ, the mu is 3;
in the case where the interval of the subcarriers is 240KHZ, the μ is 4.
Optionally, the downlink synchronization signal further includes: a value of a second offset, the second offset being an offset of a zero subcarrier in the PRB0 and a zero subcarrier in the CRBO;
the setup module is further configured to:
before the sending module issues the downlink synchronous signal, if the interval of the sub-carriers is 120KHZ, the highest bit position in the second offset is used
Is set to 0.
Optionally, M is 20.
A base station, comprising:
a processor and a memory;
the memory is used for storing programs;
the processor is configured to run the program to implement the downlink synchronization signal issuing method.
A readable storage medium, comprising: the storage medium includes a stored program, wherein the program executes the downlink synchronization signal issuing method.
According to the technical scheme, the base station sets the offset value of the zero-number physical resource block PRB0 in the SSB and the zero-number general resource block CRBO in the transmission bandwidth to be zero or (N-M) · 2μSince the SSB is configured at the low frequency end of the transmission bandwidth with a setting of zero, the SSB is set to (N-M) · 2μIn the case of (2), since the SSB is arranged at the high-frequency end of the transmission bandwidth, it is possible to avoid the SSB being arranged in the middle band region of the transmission bandwidth, and therefore, it is possible to avoid dividing the transmission bandwidth into a plurality of stages, and it is possible to reduce the PAPR.
Drawings
In order to more clearly illustrate the embodiments of the present application 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, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a downlink synchronization signal issuing method disclosed in an embodiment of the present application;
FIG. 2 is an exemplary diagram of SSBs and transmission bandwidths;
FIG. 3 is an exemplary diagram of an SSB configuration at the low frequency end of the transmission bandwidth;
FIG. 4 is an exemplary diagram of an SSB configuration at the high frequency end of the transmission bandwidth;
FIG. 5 is a diagram illustrating an example of SSB configuring the edge of transmission bandwidth versus the middle PAPR;
fig. 6 is a schematic structural diagram of an apparatus for issuing a downlink synchronization signal disclosed in an embodiment of the present application.
Detailed Description
The technical solution disclosed in the embodiments of the present application can be applied to a base station of satellite communication, but is not limited to the base station of satellite communication, and the technical solution described in the embodiments of the present application is applicable to any wireless communication system with DFT-s-OFDM waveform.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Fig. 1 is a diagram illustrating a method for issuing a downlink synchronization signal according to an embodiment of the present application, including the following steps:
s101: the base station sets the value of the first offset to 0 or (N-M) · 2μ。
The SSB versus transmission bandwidth is shown in fig. 2: the SSB includes 20 Physical Resource Blocks (PRBs), which are numbered PRB0 … … PRB19 in sequence. The transmission bandwidth includes a plurality of Common Resource Blocks (CRBs), which are sequentially numbered as CRBs 0 … … CRBMAX.
The first offset is a spectrum offset between the PRB0 and the CRBO, and the location of the CRBO is generally referred to as PointA, and therefore the first offset is also referred to as offsetttopointa.
The base station needs to allocate the value of offsetToPointA, and when offsetToPointA is 0 as shown in fig. 3, it is described that PRB0 overlaps CRBO, that is, SSB is allocated at the low frequency end of the transmission bandwidth.
As shown in fig. 4, offsetttopointa ═ 2 (N-M) ·μWhen M is 20, PRB19 overlaps CRBMAX, i.e., SSB is located at the high-frequency end of the transmission bandwidth. Wherein, the corresponding relationship between μ and the interval of the sub-carriers is shown in table 1:
TABLE 1
| Subcarrier spacing | 15 | 30 | 60 | 120 | 240 |
| |
0 | 1 | 2 | 3 | 4 |
In the above description, the SSB includes 20 PRBs as an example, but the procedure described in this embodiment is not limited to this.
S102: and calculating the value of the second offset according to the frequency value of the position of the SSB, the synchronization grid and the channel grid.
Wherein the second offset is an offset k of the zero-number subcarrier in the PRB0 and the zero-number subcarrier in the target CRBSSB. As shown in fig. 3, when PRB0 overlaps CRBO, kSSBThe offset between the zero-numbered subcarrier in PRB0 and the zero-numbered subcarrier in CRB0 is shown in FIG. 4, where PRB19 overlaps with CRBO, k isSSBIs the offset of the zero subcarrier in PRB0 from the zero subcarrier in CRBMAX-19.
The manner of calculating the value of the second offset can be found in the prior art, and is not described herein.
In addition, k isSSBThe highest bit in the PBCH Payload
At the calculation of kSSBThen, it needs to be converted into binary to obtain
The value of (c).
In the course of research, the applicant found that, in the case where the spacing of the sub-carriers in the transmission bandwidth is greater than or equal to 120KHZ,
all values of (A) are 0. However, the interval between the sub-carriers in the transmission bandwidth is greater than or equal to 120KHZ, which is a common scenario, so in this embodiment, a simple determination is provided
That is, when the spacing between the sub-carriers in the transmission bandwidth is greater than or equal to 120KHZ, the highest bit does not need to be calculated according to the frequency value of the SSB, the synchronization trellis and the channel trellis, but the highest bit can be directly calculated
Is set to zero.
Of course, in the case where the spacing between subcarriers in the transmission bandwidth is greater than or equal to 120KHZ, it is straightforward to apply
Setting to zero is only an optional way, and it is also possible to calculate the value of the second offset according to the frequency value of the SSB, the synchronization grid and the channel grid, and then further determine the value of the second offset using the prior art
The value of (c).
S103: and issuing a synchronization signal comprising a value of the first offset and a value of the second offset.
Optionally, in the prior art, the synchronization signal may further include other information, and in this embodiment, the synchronization signal may also include such existing information.
As can be seen from the flow shown in fig. 1, the base station sets the offset value so that the SSB is located at any one of the two ends of the transmission bandwidth and is not located in the middle area any more, thereby avoiding dividing the transmission bandwidth into three segments, and thus reducing the PAPR to improve the communication performance.
Further, after the UE is powered on, the SSB is blindly detected according to the frequency band supported and the search rule of the synchronization grid.
For example, assuming that the Operating Band supported by the terminal is n1, the subcarrier spacing of the SSB is 15KHz as known from the synchronization grid; pattern of SSB is Type A; the GSCN ranges from 5279 to 5419 with a step size of 1.
Sequentially determining the N value and the M value corresponding to each GSCN according to the range and the search step length of the GSCN, and then determining the frequency domain position SS of the SSB according to the N value and the M valueREF。
GSCN＝3N+(M-3)/2；N＝1:2499,M∈{1,3,5}，SSREF＝N*1200kHz+M*50kHz；
When GSCN is 5279, 3N + (M-3)/2 is 5279, N is 1760, and M is 1; SSREF＝2112.05MHz；
When GSCN is 5280, then 3N + (M-3)/2 is 5280, N is 1760, and M is 3; SSREF＝2112.15MHz；
When GSCN is 5281, then 3N + (M-3)/2 is 5281, N is 1760 and M is 5; SSREF＝2112.25MHz；
......
When GSCN is 5417, then 3N + (M-3)/2 is 5417, N is 1806, and M is 1; SSREF＝2167.25MHz；
When GSCN is 5418, then 3N + (M-3)/2 is 5418, N is 1806, and M is 3; SSREF＝2167.35MHz；
When GSCN is 5419, then 3N + (M-3)/2 is 5419, N is 1806, and M is 5; SSREF＝2167.45MHz；
The terminal searches frequency points according to the sequence of 2112.05- - >2112.15- - >2112.25MHz.. 2167.25MHz- - >2167.35MHz- - >2167.45MH in the frequency domain until SSB is detected.
As can be seen from the above process, each GSCN corresponds to a frequency domain location of an SSB within the GSCN range corresponding to Operating Band. SSB detection is to search from a low-frequency point to a high-frequency point in sequence according to a specified step length. When the SSB is located at the low frequency end of the transmission bandwidth, the UE may search for the SSB more quickly. When the SSB is located at the high frequency end of the transmission bandwidth, the number of blind tests may increase relative to when the SSB is located at the low frequency end of the transmission bandwidth.
For a more detailed procedure of the UE blind-detecting the SSB, reference may be made to the prior art, and details are not described here.
Fig. 5 shows PAPR of downlink transmission bandwidth when SSB is placed in the middle region of transmission bandwidth and at one end of transmission bandwidth, and it can be seen that SSB can obtain lower PAPR at the edge of transmission bandwidth. Where CCDF represents the complementary cumulative distribution function.
Fig. 6 is a device for issuing a downlink synchronization signal disclosed in an embodiment of the present application, including: the device comprises a setting module and a sending module.
Wherein the setting module is used for setting the value of the first offset to 0 or (N-M) · 2μ. The first offset is the offset of a physical resource block zero PRB0 in the SSB and a general resource block zero CRBO in the transmission bandwidth, where N is the number of resource blocks in the transmission bandwidth, M is the number of physical resource blocks PRB in the SSB, and μ is determined according to the interval of subcarriers in the transmission bandwidth. The sending module is used for sending down a downlink synchronous signal, and the downlink synchronous signal comprises a value of the first offset.
Optionally, the correspondence between μ and the interval of the subcarrier is as described above, and is not described herein again.
Optionally, the downlink synchronization signal further includes: the second offset is the offset between the zero-number subcarrier in PRB0 and the zero-number subcarrier in CRBO. In this case, the setup module is further configured to: before a sending module issues a downlink synchronous signal, if the interval of subcarriers is 120KHZ, the highest bit in the second offset is used
Is set to 0.
Optionally, M is 20.
The apparatus shown in fig. 6 can place the SSB at the high frequency end or the low frequency end of the transmission bandwidth, but avoid the SSB in the middle region of the transmission bandwidth, thereby achieving a lower PAPR.
The embodiment of the application also discloses a base station, which comprises a processor and a memory. The memory is used for storing programs. The processor is used for running the program to realize the downlink synchronization signal issuing method.
The embodiment of the present application also discloses a readable storage medium, which is characterized by comprising: the storage medium comprises a stored program, wherein the program executes the downlink synchronization signal issuing method.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A downlink synchronization signal issuing method is characterized by comprising the following steps:
the base station sets the value of the first offset to 0 or (N-M) · 2μThe first offset is the offset of a physical resource block PRB0 zero in an SSB and a common resource block CRBO zero in a transmission bandwidth, wherein N is the number of resource blocks in the transmission bandwidth, M is the number of physical resource blocks PRB in the SSB, and mu is determined according to the interval of subcarriers in the transmission bandwidth;
and the base station issues a downlink synchronous signal, wherein the downlink synchronous signal comprises the value of the first offset.
2. The method of claim 1, wherein the correspondence of μ to the spacing of the subcarriers comprises:
in the case that the interval of the subcarriers is 15KHZ, the mu is 0;
in the case that the interval of the subcarriers is 30KHZ, the mu is 1;
in the case that the interval of the subcarriers is 60KHZ, the mu is 2;
in the case that the spacing of the subcarriers is 120KHZ, the mu is 3;
in the case where the interval of the subcarriers is 240KHZ, the μ is 4.
3. The method of claim 1, wherein the downlink synchronization signal further comprises: a value of a second offset, which is an offset of a zero-number subcarrier in the PRB0 and a zero-number subcarrier in a target CRB, wherein the target CRB is a CRB overlapping with the PRB 0;
before the base station issues the downlink synchronization signal, the method further includes:
if the interval of the sub-carriers is larger than or equal to 120KHZ, the base station enables the highest bit in the second offset to be
Is set to 0.
4. The method of any one of claims 1-3, wherein M is 20.
5. A downlink synchronization signal issuing device is characterized by comprising:
a setting module for setting the value of the first offset to 0 or (N-M). 2μThe first offset is a physical resource block PRB0 with the number zero in SSB and a general resource block with the number zero in transmission bandwidthThe offset of the CRBO, where N is the number of resource blocks in the transmission bandwidth, M is the number of physical resource blocks PRB in the SSB, and μ is determined according to the interval of subcarriers in the transmission bandwidth;
and the sending module is used for sending down a downlink synchronous signal, and the downlink synchronous signal comprises the value of the first offset.
6. The apparatus of claim 5, wherein the correspondence of μ to the spacing of the subcarriers comprises:
in the case that the interval of the subcarriers is 15KHZ, the mu is 0;
in the case that the spacing of the subcarriers is 30KHZ, the mu is 1;
in the case that the interval of the subcarriers is 60KHZ, the mu is 2;
in the case that the interval of the subcarriers is 120KHZ, the mu is 3;
in the case where the interval of the subcarriers is 240KHZ, the μ is 4.
7. The apparatus of claim 5, wherein the downlink synchronization signal further comprises: a value of a second offset, the second offset being an offset of a zero subcarrier in the PRB0 and a zero subcarrier in the CRBO;
the setup module is further configured to:
before the sending module issues the downlink synchronous signal, if the interval of the sub-carriers is 120KHZ, the highest bit position in the second offset is used
Is set to 0.
8. The apparatus of any one of claims 5-7, wherein M is 20.
9. A base station, comprising:
a processor and a memory;
the memory is used for storing programs;
the processor is configured to run the program to implement the downlink synchronization signal issuing method according to any one of claims 1 to 4.
10. A readable storage medium, comprising: the storage medium includes a stored program, wherein the program executes the downlink synchronization signal issuing method according to any one of claims 1 to 4.
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| CN112532309B (en) * | 2020-12-21 | 2022-07-22 | 四川安迪科技实业有限公司 | Physical layer transmission method and device suitable for simple satellite internet of things terminal |
| CN115102823B (en) * | 2022-08-25 | 2022-11-01 | 北京智芯微电子科技有限公司 | OFDM peak-to-average ratio suppression method, device, electronic device and storage medium |
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