CN112134599A

CN112134599A - Frequency sweeping method, equipment, device and storage medium

Info

Publication number: CN112134599A
Application number: CN202010991504.XA
Authority: CN
Inventors: 吴晓荣
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2020-12-25
Anticipated expiration: 2040-09-17
Also published as: CN112134599B

Abstract

The embodiment of the invention provides a frequency sweeping method, equipment, a frequency sweeping device and a storage medium. The scanning method comprises the following steps: s110, determining a frequency band in a to-be-scanned range; and S120, the multiple antennas receive signals sent by the network equipment in the frequency band, wherein the automatic gain control module presets at least two gears, and at least two antennas in the multiple antennas adopt different gears in the at least two gears to amplify the received signals by different times respectively. The technical scheme of the embodiment of the invention is suitable for scenes with different signal strengths, and the same UE can receive data simultaneously based on the antennas adopting different automatic gain control gears, so that the GSCN is acquired quickly, and the frequency sweeping efficiency is improved.

Description

Frequency sweeping method, equipment, device and storage medium

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a frequency sweeping method, device, apparatus, and storage medium.

Background

For User Equipment (UE), after the UE is just started up, or when the UE searches for a new network after losing the network, in order to reduce the cell search time, power scanning is usually performed on all frequency points of possible potential cells, that is, frequency sweeping is performed, and whether cell synchronization needs to be performed on the frequency points continuously is determined according to the power of the frequency points obtained by frequency sweeping; in order to reduce the time of cell search, the frequency point power obtained by frequency sweeping is sequenced from large to small, then the frequency points are sequentially subjected to cell synchronization, and the synchronized cells further receive data demodulation system messages until the UE resides after a proper cell is searched (generally, the UE resides after searching one or more cells according to the sequence of the frequency point power from large to small, and does not search the cells where other frequency points are located any more).

As shown in fig. 1, the 5G frequency band relates to a Global grid (Global Raster), a Channel grid (Channel Raster), and a synchronization grid (SS Raster). The frequency band range of 5G is 0-100GHz, and in the wide frequency band range, the Global Raster divides the frequency band of 100GHz into 3279165 grids in total, and the grids are numbered from 0 to 3279165; each Number represents an Absolute Frequency domain position, and the numbers are called Absolute Radio Frequency Channel numbers (NR-ARFCN); a Channel rater is defined in the NR, on which the base station can deploy a Channel. The channel grid may be 100kHz, 15kHz, 30kHz, 60kHz, 120 kHz. The NR also defines a synchronization grid, and the frequency position of a synchronization signal Block (SS Block SSB, which may also be referred to as a synchronization signal/physical broadcast signal Block, SS/PBCH Block) on the operating frequency band is SSREF, which corresponds to a global synchronization grid number (GSCN). The base station may transmit the synchronization signal blocks on a synchronization grid.

As shown in Table 1, the frequency Band of 0-100GHz is divided into several Operating bands (Operating bands) by 5G, which is denoted by NR-ARFCN. Taking n1 as an example, the uplink frequency Band ranges from 384000 to 396000, the granularity of the Channel rater of the Operating Band is 100kHz, and since the frequency Band is less than 3GHz and the granularity of the NR-ARFCN is 5kHz, 20 NR-ARFCNs are included between the two Channel raters. The channel grid on the Operating Band n1 is 100kHz, the range of NR-ARFCN corresponding to the uplink frequency domain is 384000-.

TABLE 1

For the Synchronization trellis, all Synchronization Signal Blocks (SSBs) are aligned with SS raters, which are different from the Channel raters and are not a subset of ARFCNs, but rather are another set of absolute frequency domain locations, each of which has the same unique number, GSCN (global Synchronization Channel number). The GSCN parameters used by Global Raster are shown in table 2:

TABLE 2

Since the frequency domain location of the ARFCN is absolute and the frequency domain location of the GSCN is also absolute, the GSCN within each Operating Band divided by the ARFCN range is determined.

Under the condition that the frequency bands of a 5G system are multiple and the bandwidth of each frequency band is very large, when a UE starts to initially search for a network or finds a network after losing the network, the frequency bands where effective signals possibly exist need to be quickly swept, the frequency sweeping of the 5G frequency band is to find out the SS Raster where signals possibly exist in each frequency band, and the GSCN is obtained by analyzing the power spectrum of the frequency band.

Under different scenes, the intensity of signals received by the UE antenna can be greatly different, and the signals can be possibly from extremely strong to extremely weak. How to shorten the frequency sweeping time, so that the time for the UE to stay in the cell is shortened, for example, the time from no network to network recovery is shortened, thereby improving the user experience, and the problem to be solved urgently is presented.

Disclosure of Invention

The technical problem solved by the invention is how to shorten the frequency sweeping time and improve the user experience when the signal strength difference received by the UE is large in different scenes.

In order to solve the foregoing technical problem, an embodiment of the present invention provides a method for frequency sweeping for user equipment, where the user equipment includes multiple antennas and an automatic gain control module, and the method includes: s110, determining a frequency band in a range to be scanned; and S120, the multiple antennas receive signals sent by the network equipment in a frequency band, wherein the automatic gain control module presets at least two gears, and at least two antennas in the multiple antennas adopt different gears in the at least two gears to amplify the received signals by different times respectively.

Optionally, the method further includes S130, sequentially performing time-frequency conversion on each time of received data of each of the plurality of antennas to obtain power spectrums of different antennas in the frequency band; s140, respectively performing frequency spectrum splicing on frequency band power spectrums of different antennas in a frequency band to obtain respective power spectrums of a plurality of antennas in the frequency band; s150, calculating an average power spectrum of the frequency band based on the frequency band power spectrums of the plurality of antennas; and S160, comparing the power of each frequency point on the average power spectrum of the frequency band with a first threshold value, and acquiring the GSCN on at least one frequency point if the power of at least one frequency point is not less than the first threshold value.

Optionally, the power of each frequency point on the average power spectrum is compared with a first threshold, if the former is smaller than the latter and not smaller than a second threshold, and at least one of the at least two antennas adopts a non-highest gear, the automatic gain control gear of the antenna adopting the non-highest gear is increased, and steps S120 to S160 are repeatedly executed.

Optionally, the power of each frequency point on the average power spectrum is compared with the first threshold, and if the former is smaller than the latter, steps S110 to S160 are sequentially performed on the remaining frequency bands in the frequency band to be scanned.

Optionally, each antenna of the plurality of antennas employs a different one of the at least two gears.

The embodiment of the present invention further provides a user equipment, which includes a plurality of antennas and an automatic gain control module, and further includes a memory and a processor, where the memory stores computer instructions capable of running on the processor, and the processor executes the steps of any one of the above methods when executing the computer instructions.

The embodiment of the invention also provides a storage medium, which stores computer instructions, and the computer instructions execute the steps of any one of the methods when running.

An embodiment of the present invention further provides a user equipment, including: a determining module adapted to determine a frequency band in a range to be scanned; the receiving module is suitable for the multiple antennas to receive signals sent by the network equipment in a frequency band, wherein the automatic gain control module presets at least two gears, and at least two antennas in the multiple antennas adopt different gears in the at least two gears to amplify the received signals by different multiples respectively.

Optionally, comprising: the conversion module is suitable for sequentially carrying out time-frequency conversion on the received data of each antenna in the plurality of antennas to obtain power spectrums of different antennas in frequency bands; the splicing module is suitable for respectively carrying out frequency spectrum splicing on the power spectrums of different antennas in a frequency band so as to obtain the respective power spectrums of the plurality of antennas; a calculation module adapted to calculate an average power based on respective power spectra of the plurality of antennas, the average power spectrum being calculated based on the respective power spectra; and the comparison module is suitable for respectively comparing the power of each frequency point on the average power spectrum with a first threshold value, and acquiring the GSCN on at least one frequency point if the power of at least one frequency point is not less than the first threshold value.

Optionally, the comparing module is adapted to compare the power of each frequency point on the average power spectrum with a first threshold, and if the power of each frequency point on the average power spectrum is smaller than the power of each frequency point on the average power spectrum and not smaller than a second threshold, and at least one of the at least two antennas adopts a non-highest gear, increase the automatic gain control gear of the antenna adopting the non-highest gear.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects. For example, for a scenario with different signal strengths, the same UE can acquire the GSCN faster based on the fact that the antennas with different agc levels are used to receive data simultaneously, thereby improving the frequency sweeping efficiency.

Drawings

FIG. 1 is a schematic representation of a Global Raster, Channel Raster and SS Raster;

FIG. 2 is a diagram illustrating a UE frequency sweeping method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a ue according to an embodiment of the present invention.

Detailed Description

In the prior art, the signal strength under different scenes may have large variation (the signal strength may vary in a range from extremely strong to extremely weak), so that an appropriate Automatic Gain Control (AGC) gear needs to be set to ensure that the signal processed by the baseband is within a normal range. Selecting one gear for use every time of frequency sweeping, and keeping the AGC unchanged in the continuous data receiving process; if the signal is extremely strong or extremely weak, the initial default AGC gear is possibly not appropriate, the swept power spectrum is not accurate, and in this case, the signal needs to be raised or lowered to other preset AGC gears for frequency sweeping again; this can seriously affect the frequency sweep time, so that the time for UE to camp on the cell becomes long (e.g. the time for recovering from no network to network), which affects the user experience; on the other hand, however, the frequency sweeping of the multi-level AGC is very necessary for the requirement of the sensitivity of the network searching.

In the embodiment of the invention, at least two antennas of the UE can adopt different AGC gears to amplify received signals by different multiples respectively (the strength of the signals received by different antennas can be assumed in advance, so that corresponding AGC gears are preset for different antennas), which can avoid that an initial default AGC gear may be improper to raise or lower the AGC gear to re-sweep frequency, thereby shortening the frequency sweep time and improving the frequency sweep efficiency.

In the embodiment of the present invention, each technical solution may be applied to 3G, 4G, and 5G systems and systems such as a Public Land Mobile Network (PLMN) that is not evolved yet, where the 5G system includes two types of networks, namely, a Non-independent Network (NSA) and an independent Network (SA).

In the embodiment of the present invention, the UE may be an access Terminal, a subscriber unit, a subscriber Station, a Mobile Station (Mobile Station, MS), a remote Station, a remote Terminal, a Mobile device, a user Terminal, a Terminal device (Terminal Equipment), a wireless communication device, or a user agent; the UE may also be a cellular phone, a cordless phone, a Session Initiation Protocol (IP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a UE in a future 5G network or a UE in a future evolved PLMN, etc.

In an embodiment of the present invention, the Network device may be an apparatus deployed in a Radio Access Network (RAN) to provide a Wireless communication function, including but not limited to a device providing a base station function in a 3G, 4G, 5G system and a PLMN system evolved in the future, for example, the device providing the base station function in the 3G Network includes a node B (NodeB), the device providing the base station function in the 4G Network includes an evolved node B (eNB), a device providing the base station function in a Wireless Local Area Network (WLAN) (i.e., an Access Point, AP), a device providing the base station function in the 5G, and a node B (ng-eNB) that continues to evolve.

In an embodiment of the present invention, the Processor may be a Central Processing Unit (CPU), and the Processor may also be other general purpose processors, Digital Signal Processors (DSP), Application Specific Integrated Circuits (ASIC), Field Programmable Gate Arrays (FPGA), other Programmable logic devices, discrete Gate or transistor logic devices, or discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In embodiments of the invention, the memory may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. The volatile Memory may be a Random Access Memory (RAM), which acts as an external cache Memory. By way of example but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

In the embodiment of the present invention, the storage medium includes various media that can store program codes, such as a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

In the embodiments of the present invention, the apparatus embodiments are merely schematic, for example, the division of the modules is only one logical function division, and there may be other division manners in actual implementation. The module may be stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network-connected device) to perform the steps of the related methods in the embodiments of the present invention.

In order to make the objects, features and advantages of the embodiments of the present invention more comprehensible, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

In the description of the present invention, components having the same name have the same or similar functions, positional relationships, and connection relationships; signals having the same or similar labels have the same or similar functions, transmitting means and receiving means.

As shown in fig. 1, an embodiment of the present invention provides a method 100 for UE frequency sweeping, which includes:

s110, determining a frequency band in a to-be-scanned range;

and S120, the multiple antennas receive signals sent by the network device in a frequency band, wherein each antenna of the multiple antennas comprises an antenna receiving module, and the automatic gain control module inputs output signals to an antenna receiving module of the UE. The automatic gain control module presets at least two gears, and at least two antennas in the plurality of antennas adopt different gears in the at least two gears to amplify received signals by different times respectively.

In the execution of step S110, there are a plurality of frequency bands in the range to be scanned, such as the operating frequency bands n1, n2, n3, n5, n7 and the like shown in table 1. The frequency band sweep of 5G is broadband data reception, and each of the plurality of antennas may be used to receive or transmit signals.

In the execution of step S120, the multiple antennas receive the signal sent by the network device in the frequency band, the automatic gain control module presets at least two gears, and at least two antennas of the multiple antennas adopt different gears of the at least two gears to amplify the received signal by different multiples respectively.

Specifically, a corresponding AGC Gain (Gain) value is preset, and the Gain value is an Analog Auto Gain Control (AAGC) value obtained when an antenna receiving signal is calibrated; "gear" means magnification, different gears having different magnifications. For example, the scale factor can be divided into 3 grades; other grades can be divided; one of the gears is then selected as a default gear, for example, the gear with medium magnification is set as the default gear.

In some embodiments, the method 100 further comprises:

s130, sequentially carrying out time-frequency conversion on each time of receiving data of each antenna in the plurality of antennas to obtain power spectrums of different antennas in the same receiving frequency band;

s140, respectively performing frequency spectrum splicing on the power spectrums of the receiving frequency bands of different antennas in the frequency band to obtain the power spectrums of the antennas in the whole receiving frequency band;

s150, calculating the average power spectrum of the frequency band based on the power spectrum of each of the plurality of antennas in the frequency band;

and S160, comparing the power of each frequency point on the average power spectrum of the frequency band with a first threshold value, and if the power of at least one frequency point is not less than the first threshold value, acquiring the GSCN on the at least one frequency point.

In the execution of step S130, Fast Fourier Transform (FFT) is sequentially performed on the signals received by each of the plurality of antennas, so as to obtain the power spectrums of the different antennas within the same receiving frequency band. The FFT size of 5G may be 4096 points, and 4096 time domain sampling points may be transformed to the frequency domain per FFT operation to increase the data processing speed.

In the execution of step S140, the frequency band power spectrums of different antennas are respectively subjected to frequency spectrum splicing to obtain respective power spectrums of the multiple antennas in the receiving frequency band.

In specific implementation, energy accumulation is carried out on FFT output results when the frequency domain power is calculated, each antenna is respectively carried out, and the energy accumulation is respectively carried out according to the serial number of FFT; for the frequency band with the bandwidth larger than 100MHz, the central frequency point needs to be moved to receive the broadband for a plurality of times, and each antenna records the power according to the serial number of the sequential FFT, so that the power spectrum of the frequency band can be spliced into the power spectrum of each of the plurality of antennas in the frequency band.

In the execution of step S150, the average power spectrum of the frequency band may be calculated based on the power spectrum of each of the plurality of antennas in the frequency band.

For example, different weights are set based on different azimuth angles of the respective antennas, and an average power spectrum is obtained by weighted averaging, and when the weights of the respective antennas are the same, the average power spectrum is obtained by adding the powers of the respective antennas divided by the number of antennas.

In the execution of step S160, the power of each frequency point on the average power spectrum of the frequency band is compared with the first threshold, and if the power of at least one frequency point is not less than the first threshold, the GSCN is obtained on at least one frequency point. Based on the obtained frequency points corresponding to the GSCN, PSS (Primary synchronization signal)/SSS (Secondary synchronization signal) detection and PBCH (Physical Broadcast Channel) demodulation are performed one by one to search for the frequency point with the strongest cell signal, thereby completing synchronization of the UE to the cell signal.

In some embodiments, if the power of each frequency point on the average power spectrum is less than the first threshold but greater than or equal to the second threshold, and at least one of the at least two antennas adopts a non-highest gear, in order to ensure the sensitivity of frequency sweeping, the gear of the antenna adopting the non-highest gear may be increased (for example, increased by one gear or more gears), data reception is performed again on this frequency band, and steps S120 to S160 are repeatedly performed, after the frequency spectrum is re-spliced by each antenna, the power of each frequency point on the obtained average power spectrum is compared with the first threshold, and if the power of at least one frequency point is not less than the first threshold, the GSCN is obtained on these frequency points. If the power of the frequency point is still not greater than the first threshold, it is determined that there is no signal in the frequency band, and then the steps S110 to S160 are repeated by changing one frequency band. The method can effectively avoid missing scanning in a scene with weak signals, and improves the sensitivity of scanning.

The embodiment of the present invention further provides a UE, which includes multiple antennas, an agc module, a memory and a processor, where the memory stores computer instructions that can be executed on the processor, and the processor executes the steps of any method for reestablishing RRC connection by UE when executing the computer instructions.

The embodiment of the present invention further provides a storage medium, where computer instructions are stored, and the computer instructions, when executed, perform the steps of any method for reestablishing RRC connection by UE.

As shown in fig. 3, an embodiment of the present invention further provides a user device 200, including: a determining module 210 adapted to determine a frequency band in a range to be scanned; the receiving module 220 is adapted to receive signals sent by the network device in a frequency band by multiple antennas, wherein at least two gears are preset in the automatic gain control module, and at least two antennas of the multiple antennas adopt different gears of the at least two gears to amplify the received signals by different multiples respectively.

In a specific implementation, the user device 200 further includes a conversion module adapted to perform time-frequency conversion on each received data of each of the plurality of antennas to obtain power spectrums of different antennas in a frequency band; the splicing module is suitable for respectively carrying out frequency spectrum splicing on the power spectrums of different antennas in the frequency band so as to obtain the power spectrums of the antennas in the frequency band; a calculation module adapted to calculate an average power spectrum of the frequency band based on power spectra of the plurality of antennas within the frequency band; and the comparison module is suitable for respectively comparing the power of each frequency point on the average power spectrum of the frequency band with a first threshold value, and acquiring the GSCN on the frequency points if the power of at least one frequency point is not less than the first threshold value.

In a specific implementation, the comparing module is adapted to compare the power of each frequency point on the frequency band average power spectrum with a first threshold, and if the former is smaller than the latter and not smaller than a second threshold, and at least one of the at least two antennas adopts a non-highest gear, increase the dynamic gain control gear of the antenna adopting the non-highest gear.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for frequency sweeping of a user equipment, the user equipment comprising a plurality of antennas and an automatic gain control module, the method comprising:

s110, determining a frequency band in a to-be-scanned range;

and S120, the multiple antennas receive signals sent by the network device in the frequency band, wherein the automatic gain control module presets at least two gears, and at least two antennas of the multiple antennas adopt different gears of the at least two gears to amplify the received signals by different multiples respectively.

2. The method of claim 1, comprising:

s130, sequentially carrying out time-frequency conversion on each time of received data of each antenna in the plurality of antennas to obtain power spectrums of different antennas in the frequency band;

s140, respectively performing frequency spectrum splicing on the power spectrums of the different antennas in the frequency band to obtain the power spectrums of the multiple antennas in the frequency band;

3. The method of claim 2, comprising: and comparing the power of each frequency point on the average power spectrum with a first threshold, if the former is smaller than the latter and not smaller than a second threshold and at least one of the at least two antennas adopts a non-highest gear, increasing the automatic gain control gear of the antenna adopting the non-highest gear, and repeatedly executing the steps S120 to S160.

4. A method according to claim 2 or 3, comprising: and comparing the power of each frequency point on the average power spectrum with a first threshold, and if the power of each frequency point on the average power spectrum is smaller than the power of each frequency point on the average power spectrum, sequentially executing the steps S110 to S160 on the rest frequency bands in the frequency band to be scanned.

5. The method of claim 1, wherein each antenna of the plurality of antennas employs a different one of the at least two gear positions.

6. A user equipment comprising a plurality of antennas and an automatic gain control module, further comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor when executing the computer instructions performs the steps of the method of any one of claims 1 to 5.

7. A storage medium having stored thereon computer instructions, wherein the computer instructions when executed perform the steps of the method of any one of claims 1 to 5.

8. A user device, comprising:

a determining module adapted to determine a frequency band in a range to be scanned;

the receiving module is suitable for a plurality of antennas to receive signals sent by the network equipment in the frequency band, wherein the automatic gain control module presets at least two gears, and at least two antennas of the plurality of antennas adopt different gears of the at least two gears to amplify the received signals by different multiples respectively.

9. The user device according to claim 8, comprising:

the conversion module is suitable for sequentially carrying out time-frequency conversion on the received data of each antenna in the plurality of antennas to obtain power spectrums of different antennas in the frequency band;

the splicing module is suitable for respectively carrying out frequency spectrum splicing on the power spectrums of the different antennas in the frequency band so as to obtain the power spectrums of the multiple antennas in the frequency band;

a calculation module adapted to calculate an average power spectrum for the frequency band based on power spectra of the plurality of antennas within the frequency band;

and the comparison module is suitable for respectively comparing the power of each frequency point on the average power spectrum with a first threshold value, and acquiring the GSCN on at least one frequency point if the power of at least one frequency point is not less than the first threshold value.

10. The UE of claim 9, wherein the comparing module is adapted to compare the power of each frequency bin on the average power spectrum with a first threshold, and if the former is smaller than the latter and not smaller than a second threshold, and at least one of the at least two antennas adopts a non-highest gear, increase the AGC gear of the antenna adopting the non-highest gear.