CN110312302B - New air interface frequency sweeping method and new air interface terminal - Google Patents
New air interface frequency sweeping method and new air interface terminal Download PDFInfo
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Abstract
The invention provides a new air interface frequency sweeping method and a new air interface terminal, wherein the method comprises the following steps: transforming the received signal into a frequency domain signal for each of new air interface (NR) operating bands; judging whether non-overlapping bandwidths exist between PSS signals or SSS signals on the synchronous grid frequency points and PSS signals or SSS signals on adjacent synchronous grid frequency points according to GSCN numbers corresponding to the synchronous grid frequency points of each working frequency band; under the condition that the non-overlapping bandwidths exist, calculating the RSSI value of at least one RE in the non-overlapping bandwidths of the synchronous grid frequency points as the RSSI value of the synchronous grid frequency points; under the condition that the non-overlapping bandwidths do not exist, calculating the RSSI value of the SS/PBCH full bandwidth of the synchronous grid frequency point as the RSSI value of the synchronous grid frequency point; and sequencing the synchronous grid frequency points of the NR working frequency band according to the calculated RSSI value. Therefore, the fast frequency sweep of the NR frequency band can be realized by smaller calculation amount and storage amount, and the frequency sweep time can be shortened.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an NR (New Radio, New air interface) frequency sweeping method and an NR terminal.
Background
Generally, when an NR terminal performs a network search in an NR band (NR band), the NR terminal first performs frequency sweeping in the NR band to obtain a result of ordering frequency points of a Synchronization grid (Synchronization manager), and then performs detection and demodulation of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH) one by one, so as to search for an NR frequency point with the strongest cell signal as soon as possible.
In the scanning of the NR Band, in one aspect, the NR Band may be scanned by using a Received Signal Strength Indication (RSSI) in the time domain, but the NR Band is generally divided into Sub-bands (Sub-bands) with smaller bandwidths for granularity of the frequency domain, which results in longer scanning time and blurred edges. In another aspect, the NR band may be swept with frequency domain RSSI, so that a Fast Fourier Transform (FFT) may be performed for a large bandwidth to transform to the frequency domain to calculate RSSI. The sweep time is short in this way and the problem of edge blurring can be overcome by performing spectrum stitching. However, when frequency-domain RSSI is used for frequency sweeping, spectrum concatenation is required, and RSSI needs to be calculated for all sampling points in the frequency domain, so that the computation and storage amount for implementation are large, which also consumes the time for searching for the network for frequency sweeping to a certain extent.
In addition, according to the related description in the 3GPP protocol 38.211/38.101, the bandwidth of the SS/PBCH (Synchronization Signal/Physical Broadcast Channel) is 240 REs (Resource Element), and the position of the Synchronization grid of the NR band is fixed. Therefore, when frequency domain RSSI is adopted for frequency sweeping, the RSSI in the SS/PBCH bandwidth can be respectively calculated by taking each synchronous grid as a central frequency point, and then the RSSI is directly sequenced, so that the step of frequency spectrum splicing is omitted. However, the frequency sweep using the frequency domain RSSI still has the problems of large computation and storage amount during implementation and long time for searching the network by the frequency sweep.
Documents of the prior art
3GPP 38104-f30.doc
3GPP 38211-f30.doc
3GPP 38213-f30.doc
3GPP 38101-1-f30.doc
3GPP 38101-2-f30.doc
Disclosure of Invention
In view of this, in one aspect, the present invention provides a new air interface frequency sweeping method, including: converting the received signals into frequency domain signals aiming at each working frequency band in the new air interface working frequency band; judging whether non-overlapping bandwidths exist between the main synchronous signal or the auxiliary synchronous signal on the synchronous grid frequency point and the main synchronous signal or the auxiliary synchronous signal on the adjacent synchronous grid frequency point according to the global synchronous channel number corresponding to the synchronous grid frequency point of each working frequency band; under the condition that the non-overlapping bandwidths exist, calculating a receiving intensity signal indicating value of at least one resource particle in the non-overlapping bandwidths of the synchronous grid frequency point as the receiving intensity signal indicating value of the synchronous grid frequency point; under the condition that the non-overlapping bandwidth does not exist, calculating a receiving intensity signal indicating value of the full bandwidth of a synchronous signal/physical broadcast channel of the synchronous grid frequency point as the receiving intensity signal indicating value of the synchronous grid frequency point; and sequencing the synchronous grid frequency points of the new air interface working frequency band according to the calculated receiving strength signal indicating value.
For the new air interface frequency sweeping method, in a possible implementation manner, judging whether there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization grid frequency point and the primary synchronization signal or the secondary synchronization signal on the adjacent synchronization grid frequency point according to the global synchronization channel number corresponding to the synchronization grid frequency point of each working frequency band includes: determining the subcarrier interval of each working frequency band according to the global synchronous channel number corresponding to the synchronous grid frequency point of each working frequency band; and judging whether the main synchronization signal or the auxiliary synchronization signal on the synchronous grid frequency point and the main synchronization signal or the auxiliary synchronization signal on the adjacent synchronous grid frequency point have non-overlapping bandwidths according to the determined subcarrier intervals of the working frequency bands.
For the new air interface frequency sweeping method, in a possible implementation manner, judging whether there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization grid frequency point and the primary synchronization signal or the secondary synchronization signal on the adjacent synchronization grid frequency point according to the determined subcarrier intervals of each working frequency band includes: under the condition that the subcarrier interval is 15KHz or 120KHz, judging that the main synchronizing signal or the auxiliary synchronizing signal on the synchronous raster frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous raster frequency point have non-overlapping bandwidth; and under the condition that the subcarrier interval is 30KHz or 240KHz, judging that the main synchronizing signal or the auxiliary synchronizing signal on the synchronous raster frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous raster frequency point do not have non-overlapping bandwidth.
For the new air interface frequency sweeping method, in a possible implementation manner, under the condition that it is determined that there are non-overlapping bandwidths, calculating a received strength signal indication value of at least one resource element in the non-overlapping bandwidths of the synchronization raster frequency point as the received strength signal indication value of the synchronization raster frequency point includes: and calculating the receiving strength signal indicating values of all resource particles in the non-overlapping bandwidths of the synchronous grid frequency points as the receiving strength signal indicating values of the synchronous grid frequency points.
For the new air interface frequency sweeping method, in a possible implementation manner, under the condition that the synchronous grid frequency point belongs to the frequency range 1 in the new air interface operating frequency band, the number of all resource particles in the non-overlapping bandwidth is 32; and under the condition that the synchronous grid frequency point belongs to a frequency range 2 in the new air interface working frequency band, the number of all resource elements in the non-overlapping bandwidth is 48, wherein the frequency range 1 is 0-24250 MHz, and the frequency range 2 is 24250-100000 MHz.
For the new air interface frequency sweeping method, in a possible implementation manner, before sequencing the synchronous grid frequency points of the new air interface operating frequency band according to the calculated received strength signal indicating value, the method further includes: the calculated received strength signal indication value is divided by the number of resource particles used in calculating the received strength signal indication value for normalization.
In another aspect, the present invention provides a new air interface terminal, comprising: the frequency domain transformation module is used for transforming the received signals into frequency domain signals aiming at each working frequency band in the new air interface working frequency band; the non-overlapping judging module is used for judging whether non-overlapping bandwidths exist between the main synchronizing signal or the auxiliary synchronizing signal on the synchronous grid frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous grid frequency point according to the global synchronizing channel number corresponding to the synchronous grid frequency point of each working frequency band; a calculating module, configured to calculate a received intensity signal indicating value of at least one resource particle in non-overlapping bandwidths of the synchronization grid frequency point as a received intensity signal indicating value of the synchronization grid frequency point when the non-overlapping determining module determines that the non-overlapping bandwidths exist, and calculate a received intensity signal indicating value of a synchronization signal/full bandwidth of a physical broadcast channel of the synchronization grid frequency point as a received intensity signal indicating value of the synchronization grid frequency point when the non-overlapping determining module determines that the non-overlapping bandwidths do not exist; and the sequencing module is used for sequencing the synchronous grid frequency points of the new air interface working frequency band according to the receiving strength signal indicated value calculated by the calculation module.
For the new air interface terminal, in a possible implementation manner, the non-overlapping determining module includes: the determining unit is used for determining the subcarrier interval of each working frequency band according to the global synchronization channel number corresponding to the synchronization grid frequency point of each working frequency band; and the judging unit is used for judging whether the main synchronizing signal or the auxiliary synchronizing signal on the synchronous grid frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous grid frequency point have non-overlapping bandwidth or not according to the subcarrier interval of each working frequency band determined by the determining unit.
For the new air interface terminal, in a possible implementation manner, under the condition that the subcarrier interval determined by the determining unit is 15KHz or 120KHz, the determining unit determines that the main synchronization signal or the auxiliary synchronization signal on the synchronization grid frequency point and the main synchronization signal or the auxiliary synchronization signal on the adjacent synchronization grid frequency point have non-overlapping bandwidths; and under the condition that the subcarrier interval determined by the determining unit is 30KHz or 240KHz, the judging unit judges that no non-overlapping bandwidth exists between the main synchronizing signal or the auxiliary synchronizing signal on the synchronous raster frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous raster frequency point.
For the new air interface terminal, in a possible implementation manner, under the condition that the non-overlapping judging module judges that non-overlapping bandwidths exist, the calculating module calculates the received strength signal indicating values of all resource particles in the non-overlapping bandwidths of the synchronization grid frequency point as the received strength signal indicating values of the synchronization grid frequency point.
For the new air interface terminal, in a possible implementation manner, under the condition that the synchronization grid frequency point belongs to the frequency range 1 in the new air interface operating frequency band, the number of all resource particles in the non-overlapping bandwidth is 32; and under the condition that the synchronous grid frequency point belongs to a frequency range 2 in the new air interface working frequency band, the number of all resource elements in the non-overlapping bandwidth is 48, wherein the frequency range 1 is 0-24250 MHz, and the frequency range 2 is 24250-100000 MHz.
For the new air interface terminal, in a possible implementation manner, the method further includes: and the normalization module is used for dividing the calculated received strength signal indicating value by the number of the resource particles used when the received strength signal indicating value is calculated so as to perform normalization.
According to the NR frequency sweeping method and the NR terminal provided by the embodiment of the invention, the RSSI of at least one RE in the bandwidth with the synchronous grid frequency point as the central frequency point and the non-overlapping part of the PSS signal or SSS signal between the adjacent NR frequency points is only calculated as the RSSI of the synchronous grid frequency point under the condition of not influencing the identification degree and the sequencing result of the NR frequency points. Therefore, RSSI (received signal strength indicator) does not need to be calculated for all sampling points on the frequency domain of the NR frequency band, so that the quick frequency sweeping of the NR frequency band can be realized by using smaller calculation amount and storage amount, and the frequency sweeping time can be shortened to a certain extent.
Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 shows a schematic diagram of a flow of NR cell search.
Fig. 2 shows a schematic diagram of a flow of an NR sweeping method according to an embodiment of the present invention.
Fig. 3 shows a schematic diagram of a flow of an NR sweeping method according to another embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating the overlapping judgment of PSS signals of adjacent synchronization grid frequency points.
Fig. 5 shows a schematic diagram of a flow of an NR sweeping method according to another embodiment of the present invention.
Fig. 6 shows a block diagram of a structure of an NR terminal according to an embodiment of the present invention.
Fig. 7 shows a block diagram of a structure of an NR terminal according to another embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, procedures, components, and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
As described in the background, in the prior art, in a process of performing a sweep network search on an NR frequency band by an NR terminal such as a mobile terminal, a time domain RSSI may be used for sweeping, but there are problems of long sweep time and edge ambiguity. Frequency domain RSSI is typically used to perform the frequency sweep in order to speed the sweep time and to account for edge ambiguity. By the method, although the problem of edge blurring is solved and the frequency sweep time is reduced, the RSSI needs to be calculated for all sampling points on the frequency domain of the NR frequency band, even the spectrum splicing is carried out, so that the calculation amount and the storage amount are large, and the frequency sweep network searching time is consumed.
In addition, the bandwidth of the SS/PBCH is 240 REs and the location of the synchronization grid of the NR band is fixed according to the relevant description in the 3GPP protocol 38.211/38.101. Therefore, frequency domain RSSI is adopted for frequency sweeping, each synchronous grid can be used as a central frequency point, RSSI in SS/PBCH bandwidth is respectively calculated, and then sequencing is directly carried out, so that the step of frequency spectrum splicing is omitted. Thus, the calculation amount and the storage amount can be reduced to a certain extent, and the sweep time can be shortened. However, in this way, the RSSI needs to be calculated for all the sampling points in the frequency domain of the NR frequency band, which results in a large amount of calculation and storage, and thus a long time for searching the network.
In view of this, the present invention provides an NR frequency sweeping method based on frequency domain RSSI and an NR terminal, which can calculate the RSSI of a synchronization grid frequency point RSSI by calculating only the RSSI of a bandwidth with a synchronization grid as a center frequency point and with less overlap (or non-overlap) of PSS signals or SSS signals between adjacent NR frequency points without affecting the identification degree and the sorting result of the NR frequency points. Therefore, the RSSI does not need to be calculated for all the sampling points in the Frequency domain of the NR Frequency band, and the Frequency sweep of the NR Frequency band (FR1(Frequency range 1, Frequency range 1)/FR2(Frequency range 2)) can be rapidly achieved with a small amount of calculation and memory, thereby shortening the sweep time to some extent.
It should be noted that the NR terminal includes, but is not limited to, forms of mobile terminals such as smart phones and tablet computers.
According to the descriptions of 3GPP 38.213 protocol section 4.1 and 38.101-1 protocol section 5.4.3, as shown in fig. 1, the NR cell search includes the following three steps: synchronization Raster Search (Synchronization Search), Time-frequency Acquisition (Time-frequency Acquisition), and Cell ID detection (Cell ID Detect). The speed of the NR cell search is generally determined by the above three steps together. The step of searching for the NR frequency is usually performed in the NR frequency band sweep network search, which is also the main optimization direction of the present invention.
The process of the NR sweeping method according to the present invention will be described in detail with reference to fig. 2 to 5. In these drawings, the same reference numerals denote the same or similar meanings, and redundant description will be omitted.
Fig. 2 shows a schematic diagram of a flow of an NR sweeping method according to an embodiment of the present invention.
As shown in fig. 2, the method mainly includes the following steps:
step S101, converting a received signal into a frequency domain signal for each of NR operating frequency bands;
step S102, judging whether the PSS signal or SSS signal on the synchronous grid frequency point and the PSS signal or SSS signal on the adjacent synchronous grid frequency point have non-overlapping bandwidth according to the GSCN number corresponding to the synchronous grid frequency point of each working frequency band;
step S103, under the condition that the non-overlapping bandwidths exist, calculating the RSSI value of at least one resource particle in the non-overlapping bandwidths of the synchronous grid frequency point as the RSSI value of the synchronous grid frequency point;
step S104, under the condition that the non-overlapping bandwidths do not exist, calculating the RSSI value of the SS/PBCH of the synchronous grid frequency point as the RSSI value of the synchronous grid frequency point; and
and step S106, sequencing the synchronous grid frequency points of the NR frequency band according to the calculated RSSI value.
According to the NR frequency sweeping method provided by the embodiment of the invention, under the condition that the identification degree and the sequencing result of the NR frequency points are not influenced, the RSSI of at least one RE in the bandwidth which takes the synchronous grid frequency point as the central frequency point and is not overlapped by the PSS signal or the SSS signal between the adjacent NR frequency points is only calculated as the RSSI of the synchronous grid frequency point. Therefore, RSSI (received signal strength indicator) does not need to be calculated for all sampling points on the frequency domain of the NR frequency band, so that the quick frequency sweeping of the NR frequency band can be realized by using smaller calculation amount and storage amount, and the frequency sweeping time can be shortened to a certain extent.
The detailed procedures of steps S101 to S106 will be specifically detailed below, respectively.
With the above step S101, the NR terminal performs FFT transformation on the received signal for each operating band in the NR band to obtain a frequency domain signal. The NR frequency bands may include FR1 and FR 2. FR1 is a frequency range of 0-24250 MHz, and may include NR operating bands n1, n2, … …, n78, n79, and the like as in Table 1 described later. FR2 is a frequency range of 24250-100000 MHz, and may include NR operating bands n257, n258, n260, n261, etc. as in Table 2 described later. Specifically, in one possible implementation, the received signal may be transformed to the frequency domain by FFT using a large bandwidth Sub-Band (subband) according to the size of each NR Band and the capability of terminal design. In general, considering that the length of the SS/PBCH is 4 symbols, and as described in section 4.1 of 3GPP 38.213, for the received signal in the continuous time period of the initial cell selection (20ms +4 symbols), FFT transformation is performed for each Symbol and accumulation is performed, thereby obtaining the frequency domain signal (i.e., frequency sample list) over the large bandwidth Sub-Band.
Thereby, a frequency signal can be obtained for each of the NR operating bands.
For step S102, the NR terminal performs a PSS signal or SSS signal overlap determination. Specifically, the NR terminal determines whether there is a non-overlapping bandwidth between a PSS signal or an SSS signal on a Synchronization grid frequency point and a PSS signal or an SSS signal on an adjacent Synchronization grid frequency point according to a GSCN (Global Synchronization Channel Number) corresponding to the Synchronization grid frequency point of each operating frequency band.
In a possible implementation manner, as shown in fig. 3, the step S102 may include the following steps:
step S1021, SCS (Subcarrier spacing) of each working frequency band is determined according to the GSCN number corresponding to the synchronous grid frequency point of each working frequency band; and
step S1022, determining whether there is a non-overlapping bandwidth between the PSS signal or the SSS signal on the synchronization grid frequency point and the PSS signal or the SSS signal on the adjacent synchronization grid frequency point according to the determined SCS of each operating frequency band.
Specifically, for step S1021, the subcarrier spacing for each operating band may be determined based on table 1 or table 2.
Table 1 corresponds to the NR operating band in FR1 (more specifically to each of the synchronized grid bins in the NR operating band). For example, for the NR operating band n1, the GSCN range is 5279 to 5419, and the SCS corresponding to the GSCN of each synchronous grid frequency point in the NR operating band n1 is 15 kHz. For another example, for the NR operating band n5, the GSCN ranges from 2177 to 2230 and from 2183 to 2224, and if the GSCN of the synchronous grid frequency point in the NR operating band n5 is within the range from 2177 to 2230, the SCS corresponding to the GSCN of the synchronous grid frequency point is 15kHz, and if the GSCN of the synchronous grid frequency point in the NR operating band n5 is within the range from 2183 to 2224, the SCS corresponding to the GSCN of the synchronous grid frequency point is 30 kHz. For other operating frequency bands in FR1, SCS corresponding to GSCN of each synchronous grid frequency point can be determined in the same way.
Furthermore, table 2 corresponds to the NR operating band in FR 2. For example, for the NR working band n257, the GSCN ranges are 22388-22558 and 22390-22556, and if the GSCN of the synchronous grid frequency point in the NR working band n257 is within the range 22388-22558, the SCS corresponding to the GSCN of the synchronous grid frequency point is 120kHz, and if the GSCN of the synchronous grid frequency point in the NR working band n257 is within the range 22390-22556, the SCS corresponding to the GSCN of the synchronous grid frequency point is 240 kHz. For other operating frequency bands in FR2, SCS corresponding to GSCN of each synchronous grid frequency point can be determined in the same way.
Thus, the SCS of each operating band can be determined from the GSCN number of the synchronization grid frequency point for each operating band based on table 1 or table 2.
TABLE 1 SS raster entries applicable for each operating band (FR1)
TABLE 2 SS raster entries applicable for each operating band (FR2)
For step S1022, after determining the SCS of each operating frequency band, it may be determined whether there is a non-overlapping bandwidth between the PSS signal or the SSS signal of each synchronization grid frequency point and the PSS signal or the SSS signal of the adjacent synchronization grid frequency point in the operating frequency band according to the SCS of each operating frequency band.
The following will specifically describe the determination of whether there is non-overlapping bandwidth in PSS signals or SSS signals of adjacent synchronization grid frequency points. Since the overlapping range between the PSS signals of adjacent synchronization grid frequency points coincides with the overlapping range between the SSS signals of adjacent synchronization grid frequency points, only the overlapping between the PSS signals of adjacent synchronization grid frequency points will be explained below.
According to the description of 3GPP 38.101-1/2 protocol section 5.4.3, the minimum spacing of the NR cell synchronization grid frequency points is different from FR1 and FR2, which satisfy the constraints in tables 3 and 4 below, respectively.
TABLE 3 GSCN parameters for Global grid of points (FR1)
TABLE 4 GSCN parameters for Global grid of points (FR2)
On the other hand, according to the description of 3GPP 38.211 protocol section 7.4.3, the bandwidth of the SS/PBCH is 240 REs, as shown in table 5 below.
TABLE 5 resources of PSS, SSS, PBCH and DM-RS of PBCH within SS/PBCH block
If there are SS/PBCH signals on two adjacent synchronization grid frequency points, it can be seen that REs on partial bandwidth of PSS signal are not overlapped when SCS of FR1 is 15KHz or SCS of FR2 is 120 KHz. For example, as shown in FIG. 4, consider the following scenario: there are SS/PBCH signals on three adjacent synchronization grid frequency points, and it can be seen that there is no overlap of PSS signals on 16 REs (FR1)/24 REs (FR2) around the center frequency point of the synchronization grid. That is, when SCS of the NR band is 15kHz (FR1) or 120kHz (FR2), REs on partial bandwidth of the PSS signal are non-overlapping, i.e., there is non-overlapping bandwidth for PSS signals of two adjacent synchronization grid frequency points, and the number of REs of the non-overlapping bandwidth is 32(FR1) or 48(FR 2).
On the other hand, when the SCS of FR1 is 30kHz or the SCS of FR2 is 240kHz, the PSS signals of the two adjacent synchronous grid frequency points are completely overlapped. That is, at SCS of NR band of 30kHz (FR1) or 240kHz (corresponding to FR2), REs on the full bandwidth of the SS/PBCH of PSS signal are fully overlapped (i.e. all 240 REs on the full bandwidth of the SS/PBCH are overlapped). In other words, in this case, there is no non-overlapping bandwidth of the PSS signals of the adjacent two synchronization grid frequency points.
In step S103, when it is determined that there is a non-overlapping bandwidth between the PSS signal and the SSS signal of adjacent synchronization grid frequency points, an RSSI value of at least one RE in the non-overlapping bandwidth of the synchronization grid frequency point is calculated as the RSSI value of the synchronization grid frequency point.
Specifically, when the SCS of FR1 is 15KHz or the SCS of FR2 is 120KHz, as shown in fig. 4, SS/PBCH signals are present at three adjacent synchronization grid frequency points, namely, at the SS master 1 frequency point, the SS master 2 frequency point, and the SS master 3 frequency point, and it can be seen that PSS signals at 16 REs (FR1)/24 REs (FR2) on the left and right of the center frequency point of the synchronization grid are not overlapped. In this case, if only the RSSI of the portion of the bandwidth where the PSS signals do not overlap is calculated, the RSSI of the SS master 2 bin superimposes the PBCH/SSs signals of the SS master 1 and the SS master 3 as shown in fig. 4. Specifically, the RSSI of each synchronization grid is shown in table 6 below.
TABLE 6
In table 6 above, PSS1, PSS2, and PSS3 represent PSS of SS master 1 frequency point, SS master 2 frequency point, and SS master 3 frequency point, respectively. Further, since the RSSI is expressed in terms of EPRE (Energy per resource element), SSS is the same as EPRE of PBCH and is therefore collectively denoted as SSB (Synchronization Signal Block). In other words, SSB1, SSB2, and SSB3 represent SSs + PBCH for SS master 1 frequency point, SS master 2 frequency point, and SS master 3 frequency point, respectively.
In addition, in table 6 above, it is assumed that the true RSSI strength and weakness relationships of the SS master 1 frequency point, the SS master 2 frequency point, and the SS master 3 frequency point are as follows:
(1) SS Raster2 was strong, and SS Raster1/3 was weak. According to the formula in the table, the strength relationship of the RSSI of the three can be clearly distinguished. Namely, SS Raster2 was strongest, SS Raster1 times weakest, and SS Raster3 was weakest (wherein SS Raster1 was previously assumed to be stronger than SS Raster 3).
(2) SS Raster1/3 was strong and SS Raster2 was weak. Since the SS rater 2 superimposes SS rater 1/3 signals with the same number of REs on the full bandwidth of the SS/PBCH, the strength of the three SS raters cannot be clearly distinguished whether the RSSI over the full bandwidth of the SS/PBCH is calculated or only the RSSI of the number of REs in table 6 above is calculated.
Therefore, only the RSSI of the partial bandwidth without overlapping of the PSS signals of the adjacent grid frequency points is calculated, and the identification degree and the sequencing result of the NR frequency points are not influenced.
Therefore, in step S103, when it is determined that there is an overlapping bandwidth between the PSS signal or SSS signal of the synchronization trellis frequency point and the PSS signal or SSS signal of the adjacent synchronization trellis frequency point, the RSSI value of only a part of REs in the overlapping bandwidth may be calculated as the RSSI value of the synchronization trellis frequency point instead of calculating the RSSI value of the full SS/PBCH bandwidth for the synchronization trellis frequency point.
In a possible manner, when it is determined that there is an non-overlapping bandwidth between the PSS signal or the SSS signal of the synchronization grid frequency point and the PSS signal or the SSS signal of the adjacent synchronization grid frequency point, the RSSI value of one RE in the non-overlapping bandwidth of the synchronization grid frequency point may be calculated as the RSSI value of the synchronization grid frequency point. Preferably, RSSI values of a plurality of REs in non-overlapping bandwidths of the synchronization raster frequency point may be calculated as the RSSI values of the synchronization raster frequency point, where the plurality of REs may be continuous or discrete. More preferably, RSSI values of all REs (i.e., 32 REs (FR1) or 48 REs (FR2)) in the non-overlapping bandwidths of the synchronization raster frequency point may be calculated as the RSSI values of the synchronization raster frequency point.
For the step S104, when it is determined that there is a non-overlapping bandwidth between the PSS signal or SSS signal of the synchronization grid frequency point and the PSS signal or SSS signal of the adjacent synchronization grid frequency point, the RSSI value of the full SS/PBCH bandwidth of the synchronization grid frequency point is calculated as the RSSI value of the synchronization grid frequency point. This is because, under the condition that the PSS signals or SSS signals of adjacent synchronization grid frequency points are completely overlapped, the RSSI of the full bandwidth of the SS/PBCH needs to be calculated, so as to ensure that the identification degree and the sequencing result of the NR frequency point are not affected. As can be seen from tables 1 and 2 above, at the SS Raster corresponding to some GSCNs, only the RSSI of the full bandwidth of the SS/PBCH can be calculated since the SCS is 30KHz and 240KHz, respectively.
That is, when it is determined that the PSS signal or SSS signal of a synchronization trellis frequency point completely overlaps with the PSS signal or SSS signal of an adjacent synchronization trellis frequency point, RSSI values of all 240 REs of the synchronization trellis frequency point are calculated as the RSSI values of the synchronization trellis frequency point.
In step S106, the synchronization trellis bins of all NR bands may be sorted according to the calculated RSSI value.
In a possible implementation manner, as shown in fig. 5, before the step S106, the NR frequency sweeping method of the present invention may further include the following steps:
step S105 is to divide the calculated RSSI value by the number of REs used in calculating the RSSI value to perform normalization.
Specifically, after the RSSI value of each synchronization trellis frequency point is calculated in steps S103 and S104, the calculated RSSI value may be divided by the number of REs used in calculating the RSSI value to normalize the RSSI value to the RE Level (RE Level), thereby deviating from the association of the bandwidth. In addition, in a possible implementation manner, the calculated RSSI value may be stored according to a synchronization grid frequency point.
Thus, in step S106, a synchronous raster frequency point sorting result can be obtained from the RSSI values stored for each synchronous raster frequency point. Since the RSSI value stored on each synchronization grid frequency point is normalized, the RSSI value of the SS/PBCH full bandwidth or the RSSI value of at least one RE in the partial bandwidth which is not overlapped by the PSS is only calculated, and the comparison and sequencing can be directly carried out, so that the sequencing result of the synchronization grid frequency points is obtained.
According to the NR frequency sweeping method provided by the embodiment of the invention, whether the non-overlapping bandwidth exists between the PSS signal or SSS signal on the synchronous grid frequency point and the PSS signal or SSS signal on the adjacent synchronous grid frequency point can be judged through the GSCN number under the condition that the identification degree and the sequencing result of the NR frequency point are not influenced. If the Received Signal Strength Indication (RSSI) exists, only the RSSI of at least one RE of the bandwidth, which takes the synchronous grid frequency point as a central frequency point and is not overlapped by the PSS signal or the SSS signal between the adjacent NR frequency points, is calculated as the RSSI of the synchronous grid frequency point; and if the RSSI does not exist, calculating the RSSI of the SS/PBCH full bandwidth of the synchronous grid frequency point as the RSSI of the synchronous grid frequency point. Therefore, compared with the prior art, RSSI (received signal strength indicator) does not need to be calculated for all sampling points on the frequency domain of the NR frequency band, so that the quick frequency sweeping of the NR frequency band can be realized by using smaller calculation amount and storage amount, and the frequency sweeping time can be shortened to a certain extent.
The specific structure of the NR terminal of the embodiment of the present invention will be described in detail below with reference to fig. 6 to 7. In the drawings, the same reference numerals denote the same or similar meanings, and redundant description will be omitted
Fig. 6 shows a block diagram of a structure of an NR terminal according to an embodiment of the present invention. As shown in fig. 6, the NR terminal 60 includes: a frequency domain transforming module 61, configured to transform the received signal into a frequency domain signal for each operating frequency band in the new air interface operating frequency band; a non-overlapping judging module 62, configured to judge whether there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization grid frequency point and the primary synchronization signal or the secondary synchronization signal on an adjacent synchronization grid frequency point according to the global synchronization channel number corresponding to the synchronization grid frequency point of each operating frequency band; a calculating module 63, configured to calculate, when the non-overlapping determining module 62 determines that there is a non-overlapping bandwidth, a received intensity signal indicating value of at least one resource particle in the non-overlapping bandwidth of the synchronization grid frequency point as the received intensity signal indicating value of the synchronization grid frequency point, and when the non-overlapping determining module 62 determines that there is no non-overlapping bandwidth, calculate a received intensity signal indicating value of a synchronization signal/full bandwidth of a physical broadcast channel of the synchronization grid frequency point as the received intensity signal indicating value of the synchronization grid frequency point; and a sorting module 64, configured to sort the synchronous grid frequency points of the new air interface operating frequency band according to the received strength signal indication value calculated by the calculation module.
The NR terminal 60 of the present embodiment may be used to perform the NR sweeping method set forth in any of the above embodiments. For a detailed description of the NR sweeping method, refer to the above embodiments.
According to the NR terminal provided in the embodiment of the present invention, the RSSI of at least one RE in the bandwidth where the PSS signal or the SSS signal does not overlap between adjacent NR frequency points and the synchronization grid frequency point is only calculated as the RSSI of the synchronization grid frequency point without affecting the degree of identification and the ranking result of the NR frequency points. Therefore, RSSI (received signal strength indicator) does not need to be calculated for all sampling points on the frequency domain of the NR frequency band, so that the quick frequency sweeping of the NR frequency band can be realized by using smaller calculation amount and storage amount, and the frequency sweeping time can be shortened to a certain extent.
Fig. 7 shows a block diagram of a structure of an NR terminal according to another embodiment of the present invention. As shown in fig. 7, the main difference between the NR terminal 70 shown in fig. 7 and the NR terminal 60 shown in fig. 6 is that the non-overlap determination module 62 includes: a determining unit 621, configured to determine a subcarrier interval of each operating band according to a global synchronization channel number corresponding to a synchronization grid frequency point of each operating band; and a determining unit 622, configured to determine whether there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization grid frequency point and the primary synchronization signal or the secondary synchronization signal on an adjacent synchronization grid frequency point according to the subcarrier interval of each working frequency band determined by the determining unit 621.
For the new air interface terminal 70, in a possible implementation manner, under the condition that the subcarrier interval determined by the determining unit 621 is 15KHz or 120KHz, the determining unit 622 determines that there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization grid frequency point and the primary synchronization signal or the secondary synchronization signal on the adjacent synchronization grid frequency point; and in the case that the subcarrier interval determined by the determining unit 621 is 30KHz or 240KHz, the determining unit 622 determines that there is no non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization raster frequency point and the primary synchronization signal or the secondary synchronization signal on the adjacent synchronization raster frequency point.
For the new air interface terminal 70, in a possible implementation manner, when the non-overlapping determining module 62 determines that there are non-overlapping bandwidths, the calculating module 63 calculates the received strength signal indicator values of all resource elements in the non-overlapping bandwidths of the synchronization trellis frequency point as the received strength signal indicator values of the synchronization trellis frequency point.
For the new air interface terminal 70, in a possible implementation manner, under the condition that the synchronization grid frequency point belongs to the frequency range 1 in the new air interface operating frequency band, the number of all resource particles in the non-overlapping bandwidth is 32; and under the condition that the synchronous grid frequency point belongs to a frequency range 2 in the new air interface working frequency band, the number of all resource elements in the non-overlapping bandwidth is 48, wherein the frequency range 1 is 0-24250 MHz, and the frequency range 2 is 24250-100000 MHz.
For the new air interface terminal 70, in a possible implementation manner, the method further includes: a normalization module 65, configured to divide the calculated rssi value by the number of resource particles used in calculating the rssi value, so as to perform normalization.
The NR terminal 70 of the present embodiment may be used to execute the NR sweeping method set forth in any of the above embodiments. For a detailed description of the NR sweeping method, refer to the above embodiments.
According to the NR terminal provided in the embodiment of the present invention, the RSSI of at least one RE in the bandwidth where the PSS signal or the SSS signal does not overlap between adjacent NR frequency points and the synchronization grid frequency point is only calculated as the RSSI of the synchronization grid frequency point without affecting the degree of identification and the ranking result of the NR frequency points. Therefore, RSSI (received signal strength indicator) does not need to be calculated for all sampling points on the frequency domain of the NR frequency band, so that the quick frequency sweeping of the NR frequency band can be realized by using smaller calculation amount and storage amount, and the frequency sweeping time can be shortened to a certain extent.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A new air interface frequency sweeping method is characterized by comprising the following steps:
converting the received signals into frequency domain signals aiming at each working frequency band in the new air interface working frequency band;
judging whether non-overlapping bandwidths exist between the main synchronous signal or the auxiliary synchronous signal on the synchronous grid frequency point and the main synchronous signal or the auxiliary synchronous signal on the adjacent synchronous grid frequency point according to the global synchronous channel number corresponding to the synchronous grid frequency point of each working frequency band;
under the condition that the non-overlapping bandwidths exist, calculating a receiving intensity signal indicating value of at least one resource particle in the non-overlapping bandwidths of the synchronous grid frequency point as the receiving intensity signal indicating value of the synchronous grid frequency point;
under the condition that the non-overlapping bandwidth does not exist, calculating a receiving intensity signal indicating value of the full bandwidth of a synchronous signal/physical broadcast channel of the synchronous grid frequency point as the receiving intensity signal indicating value of the synchronous grid frequency point; and
sequencing the synchronous grid frequency points of the new air interface working frequency band according to the calculated receiving strength signal indicating value;
judging whether non-overlapping bandwidths exist between the main synchronous signal or the auxiliary synchronous signal on the synchronous grid frequency point and the main synchronous signal or the auxiliary synchronous signal on the adjacent synchronous grid frequency point according to the global synchronous channel number corresponding to the synchronous grid frequency point of each working frequency band, wherein the method comprises the following steps:
determining the subcarrier interval of each working frequency band according to the global synchronous channel number corresponding to the synchronous grid frequency point of each working frequency band; and
and judging whether the main synchronization signal or the auxiliary synchronization signal on the synchronous grid frequency point and the main synchronization signal or the auxiliary synchronization signal on the adjacent synchronous grid frequency point have non-overlapping bandwidths according to the determined subcarrier intervals of the working frequency bands.
2. A new air interface frequency sweeping method according to claim 1, wherein the step of determining whether there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization raster frequency point and the primary synchronization signal or the secondary synchronization signal on the adjacent synchronization raster frequency point according to the determined subcarrier spacing of each operating frequency band comprises:
under the condition that the subcarrier interval is 15KHz or 120KHz, judging that the main synchronizing signal or the auxiliary synchronizing signal on the synchronous raster frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous raster frequency point have non-overlapping bandwidth; and
and under the condition that the subcarrier interval is 30KHz or 240KHz, judging that the main synchronizing signal or the auxiliary synchronizing signal on the synchronous raster frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous raster frequency point do not have non-overlapping bandwidth.
3. A new air interface frequency sweeping method according to claim 1, wherein under the condition that it is determined that there are non-overlapping bandwidths, calculating a received strength signal indication value of at least one resource element in the non-overlapping bandwidths of the synchronization raster frequency point as the received strength signal indication value of the synchronization raster frequency point includes:
and calculating the receiving strength signal indicating values of all resource particles in the non-overlapping bandwidths of the synchronous grid frequency points as the receiving strength signal indicating values of the synchronous grid frequency points.
4. A new air interface frequency sweeping method according to claim 3, characterized in that, under the condition that the synchronous raster frequency point belongs to the frequency range 1 in the new air interface operating frequency band, the number of all resource particles in the non-overlapping bandwidth is 32; and in case that the synchronization grid frequency point belongs to frequency range 2 in the new air interface operating frequency band, the number of all resource elements in the non-overlapping bandwidth is 48,
wherein the frequency range 1 is 0-24250 MHz, and the frequency range 2 is 24250-100000 MHz.
5. A new air interface frequency sweeping method according to any one of claims 1 to 4, characterized in that before the sequencing of the synchronous grid frequency points of the new air interface operating band according to the calculated received strength signal indicating value, the method further comprises:
the calculated received strength signal indication value is divided by the number of resource particles used in calculating the received strength signal indication value for normalization.
6. A new air interface terminal, comprising:
the frequency domain transformation module is used for transforming the received signals into frequency domain signals aiming at each working frequency band in the new air interface working frequency band;
the non-overlapping judging module is used for judging whether non-overlapping bandwidths exist between the main synchronizing signal or the auxiliary synchronizing signal on the synchronous grid frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous grid frequency point according to the global synchronizing channel number corresponding to the synchronous grid frequency point of each working frequency band;
a calculating module, configured to calculate a received intensity signal indicating value of at least one resource particle in non-overlapping bandwidths of the synchronization grid frequency point as a received intensity signal indicating value of the synchronization grid frequency point when the non-overlapping determining module determines that the non-overlapping bandwidths exist, and calculate a received intensity signal indicating value of a synchronization signal/full bandwidth of a physical broadcast channel of the synchronization grid frequency point as a received intensity signal indicating value of the synchronization grid frequency point when the non-overlapping determining module determines that the non-overlapping bandwidths do not exist; and
the sequencing module is used for sequencing the synchronous grid frequency points of the new air interface working frequency band according to the receiving strength signal indicated value calculated by the calculation module;
the non-overlapping judgment module comprises:
the determining unit is used for determining the subcarrier interval of each working frequency band according to the global synchronization channel number corresponding to the synchronization grid frequency point of each working frequency band; and
and the judging unit is used for judging whether the main synchronizing signal or the auxiliary synchronizing signal on the synchronous grid frequency point and the main synchronizing signal or the auxiliary synchronizing signal on the adjacent synchronous grid frequency point have non-overlapping bandwidths according to the subcarrier intervals of the working frequency bands determined by the determining unit.
7. The new air-interface terminal according to claim 6, wherein, in case that the subcarrier spacing determined by the determining unit is 15KHz or 120KHz, the determining unit determines that there is a non-overlapping bandwidth between the primary synchronization signal or the secondary synchronization signal on the synchronization raster frequency point and the primary synchronization signal or the secondary synchronization signal on the adjacent synchronization raster frequency point; and
and under the condition that the subcarrier interval determined by the determining unit is 30KHz or 240KHz, the judging unit judges that no non-overlapping bandwidth exists between the main synchronization signal or the auxiliary synchronization signal on the synchronous raster frequency point and the main synchronization signal or the auxiliary synchronization signal on the adjacent synchronous raster frequency point.
8. The new air-interface terminal of claim 6, wherein, when the non-overlapping determining module determines that there are non-overlapping bandwidths, the calculating module calculates the rssi values of all resource elements in the non-overlapping bandwidths of the synchronization trellis frequency point as the rssi values of the synchronization trellis frequency point.
9. The new air-interface terminal according to claim 8, characterized in that, in case that the synchronization grid frequency point belongs to frequency range 1 in the new air-interface operating frequency band, the number of all resource elements in the non-overlapping bandwidth is 32; and in case that the synchronization grid frequency point belongs to frequency range 2 in the new air interface operating frequency band, the number of all resource elements in the non-overlapping bandwidth is 48,
wherein the frequency range 1 is 0-24250 MHz, and the frequency range 2 is 24250-100000 MHz.
10. The new air interface terminal according to any of claims 6 to 9, further comprising:
and the normalization module is used for dividing the calculated received strength signal indicating value by the number of the resource particles used when the received strength signal indicating value is calculated so as to perform normalization.
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| US11711775B2 (en) * | 2020-05-07 | 2023-07-25 | Qualcomm Incorporated | Energy per resource element ratio for synchronization signal block symbols |
| CN112203348B (en) * | 2020-10-09 | 2023-04-18 | Oppo广东移动通信有限公司 | Synchronous grid processing method and device, terminal and storage medium |
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